Lifting type range hood

Abstract

A range hood comprises an upper box body, a lower box body and an air inlet body, and is characterized in that the upper box body is a fixed part, the lower box body is arranged on the upper box body, the air inlet body is arranged on the lower box body, and the lower box body and / or the air inlet body are / is lifting movable parts.

Description

Technical Field

[0001] The invention relates to the technical field of range hoods, and in particular to a range hood. Background Art

[0002] Range hoods have become one of the indispensable kitchen appliances in modern families. Range hoods work based on the principle of fluid dynamics. A centrifugal fan installed inside the range hood absorbs and exhausts oil fumes, and a filter is used to filter out some grease particles. The centrifugal fan includes a volute, an impeller installed in the volute, and a motor that drives the impeller to rotate. When the impeller rotates, negative pressure suction is generated in the center of the fan, sucking the oil fumes under the range hood into the fan, which are then collected by the volute and guided to be discharged outdoors after being accelerated by the fan. After the range hood has been working for a long time, oil will be generated inside the range hood. When the oil accumulates inside the hood, it will affect the oil absorbing effect and the service life of the range hood. Therefore, it is necessary to design the oil path inside the hood so that the oil can flow into the oil cup in time. For example, the Chinese utility model patent with patent number 202121836163.5 (authorization announcement number CN216790277U) discloses "An oil net assembly and a range hood using the oil net assembly". The range hood is equipped with a first oil net and a second oil net, thereby enhancing the filtering performance of oil fumes. The second oil net adopts a double-sided oil guide structure with a raised middle to achieve a larger oil guide angle, improve the oil guide capacity, ensure a smoother oil path, reduce condensation, and reduce the cleaning frequency. However, it does not solve the technical problem of how to reduce the negative pressure area to improve the oil fume extraction effect.

[0003] The change in the working form of the range hood can achieve both the oil fume suction effect when working and the simplicity and beauty when turned off. The lifting range hood is an important direction of morphological change. For example, the "A Range Hood" disclosed in the Chinese invention patent with patent number 202010294463.9 (authorization announcement number CN 1111425902B), the oil guide structure of the range hood includes a first oil guide trough assembly for collecting condensed oil from the second air inlet box and the fan system, and a second oil guide trough assembly for guiding the condensed oil collected in the first oil guide trough assembly to the oil cup, and the first oil guide trough assembly is arranged on the lower inner periphery of the second air inlet box. This range hood is a lifting range hood, which can realize the downward movement of the negative pressure area by lowering the first air inlet box, thereby improving the oil fume extraction effect. In addition, by setting an oil guide structure, the condensed oil in the fixed part of the range hood can be transferred to the moving part, and it has the advantages of reducing the risk of blockage and small pollution surface. However, the air inlet cavity is narrow and there is no oil fume buffer space. The oil fume extraction effect needs to be improved, and there is a risk that the oil in the upper box will overflow from the lower box. In addition, during the lifting process of the first air inlet box of the range hood relative to the second air inlet box, there may be a pressure relief problem between the two, thereby affecting the oil fume extraction effect.

[0004] Another example is the "A Range Hood" disclosed in the Chinese invention patent with patent number 202010007102.1 (authorization announcement number CN 111006284 B). The fan cover of the range hood is provided with an oil guide structure for guiding the oil discharged from the fan cover and the fan system into the first air inlet box body. The oil guide structure includes an oil storage guide groove capable of storing oil, and the oil storage guide groove is provided with an oil outlet. The oil guide structure also includes an oil outlet opening and closing mechanism. When the first air inlet box body is in a lowered state, the oil outlet opening and closing mechanism opens the oil outlet so that the oil storage guide groove and the interior of the first air inlet box body are connected. When the first air inlet box body is in a state retracted in the fan cover, the oil outlet opening and closing mechanism closes the oil outlet. Although the range hood collects the oil uniformly to the oil collection device of the air inlet assembly, solving the oil path problem under the single oil collection device of the built-in lifting range hood, since the range hood only has the air inlet box body that moves up and down relative to the fan cover, and the air inlet box body and the range fume fan are staggered in the front-to-back direction, the lifting of the air inlet box body does not need to consider the avoidance problem with the range fume fan. However, if the lower box body can move up and down relative to the upper box body, and the range fume fan is arranged in the upper box body, the internal space of the lower box body needs to be reasonably designed so that the lower box body can effectively avoid the range fume fan when it is raised, so as to reduce the height of the whole machine. In addition, during the lifting process of the first air inlet box of the range hood, the oil on the inner wall of the second air inlet box cannot be scraped off, which makes it easy for the inner wall of the second air inlet box to be stained with oil. If too much oil adheres, it will not only affect the oil fume extraction effect, but also have an adverse effect on the lifting of the first air inlet box. The cleaning of the inside of the second air inlet box is relatively inconvenient, and professional personnel are required to disassemble the machine for cleaning. In addition, the problem to be solved is the oil circuit problem of the range hood with a single-stage lifting structure. For the range hood with a two-stage lifting structure, the structure of the whole machine is not completely fixed. How to ensure the connection reliability and flow channel sealing of the whole machine during the lifting process becomes a problem that needs to be solved. It is necessary to solve the oil circuit problem between the upper box and the lower box, and the oil circuit problem between the lower box and the air inlet body.

[0005] Another example is the "A Range Hood" disclosed in the Chinese utility model patent with patent number 202221698878.3 (authorization announcement number CN217876026 U) and the "Hidden Range Hood" disclosed in the Chinese utility model patent with patent number 201821783223.X (authorization announcement number CN209355322U). Although both disclose lift-type range hoods, the negative pressure area is moved downward by lowering the air inlet body to improve the oil fume extraction effect, but they do not solve the oil circuit problem faced by lift-type range hoods. Another example is the "A Fully Embedded Range Hood" disclosed in the Chinese invention patent application with application number CN201810617139.9 (application publication number CN 108644837A). The oil in the smoke collection chamber is extracted from the front oil cup, and the oil in the air inlet body is extracted from the lower oil cup. The double oil cups are not beautiful and are cumbersome to clean. In addition, some range hoods are equipped with an oil guide plate under the fan system to receive the oil dripping from the fan system and the upper box and then guide it into the oil cup. Since the existing oil guide plate is often a flat structure, the oil in the fan system will be discharged disorderly, thereby reducing the cleanliness and oil discharge efficiency inside the entire machine.

[0006] Another example is the "Submersible Range Hood with Automatic Two-Stage Lifting" disclosed in the Chinese invention patent application with application number 201911422254.1 (application publication number CN 110925848 A). The range hood includes a volute and an air duct system, and the volute and the air duct system include a lower box and an upper box. The inner cavities of the lower box and the upper box are connected, and the top of the lower box and the bottom of the upper box are fixedly connected. A push rod motor is fixedly connected to the back plate of the inner cavity of the upper box, and the bottom end of the push rod motor is fixed to the back plate of the inner cavity of the lower box, and the output end of the push rod motor is fixedly connected to the lower lifting frame assembly. The submersible range hood capable of automatic two-stage lifting and lowering is driven by a push rod motor to drive the telescopic rod thereon, and the upper lifting frame assembly and the lower lifting frame assembly are moved up and down by the cooperation of the upper lifting frame slide rail and the lower lifting frame slide rail, thereby making the lower lifting frame assembly closer to the stove, thereby ensuring the effect of extracting oil smoke, and the cooperation of the upper lifting frame slide rail, the lower lifting frame slide rail and the push rod motor ensures the smooth operation of the upper lifting frame assembly and the lower lifting frame assembly, thereby achieving two-stage lifting and lowering. Since the lower box and the upper box of the range hood are fixedly connected to each other, only the upper lifting frame assembly and the lower lifting frame assembly move up and down, so that the volume of the whole machine is relatively large in the off state, and there is no need to consider the interference problem between the lower box and the fan during the lifting process.

[0007] In addition, for a lifting range hood, a driving mechanism is required to drive the movable parts to perform lifting movements, such as the "Hidden Range Hood" disclosed in the Chinese utility model patent with patent number 201821783223.X (authorization announcement number CN209355322 U), which includes a wind cabinet and a smoke hood, the smoke hood and the wind cabinet are connected, and a first lifting mechanism is arranged between the smoke hood and the wind cabinet, one end of the first lifting mechanism is connected to the smoke hood, and the other end of the first lifting mechanism is connected to the wind cabinet, and the first lifting mechanism drives the smoke hood to move up and down. A channel connected to the inner cavity of the smoke hood is opened on the bottom surface of the smoke hood, and the smoke hood also includes a movable smoke hood, a second smoke inlet is arranged on the front of the movable smoke hood, the movable smoke hood is arranged in the channel, and a second lifting mechanism is arranged in the inner cavity of the smoke hood, the second lifting mechanism is connected to the movable smoke hood, and the second lifting mechanism drives the movable smoke hood to move up and down along the channel to cover or expose the second smoke inlet. Since the smoke hood can move up and down relative to the wind cabinet under the drive of the first lifting mechanism, the distance between the smoke hood and the stove is adjusted, the adjustment of the smoking area is realized, and the volume of the range hood is also adjusted, reducing the kitchen space occupied by the range hood, making the user more flexible in the kitchen operation, and improving the practicality of the range hood. On this basis, the movable smoke hood set in the channel of the smoke hood can be driven by the second lifting mechanism to extend out of the smoke hood. When the amount of oil smoke is large, the movable smoke hood extends out of the smoke hood to lower the smoking area, and the oil smoke can enter the smoke hood along the second smoke inlet of the movable smoke hood, thereby improving the smoking effect of the range hood. However, the range hood still has certain shortcomings. The wind cabinet, the smoke hood and the movable smoke hood are driven by two independent lifting mechanisms to realize the up and down movement adjustment of the smoke hood and the movable smoke hood. The increase in the number of lifting mechanisms will inevitably occupy too much internal space of the range hood, and it is also easy to cause motion interference with other components inside the range hood, which is not conducive to the reasonable spatial arrangement of other components inside the range hood. In addition, whether it is the first lifting mechanism used to drive the smoke hood to rise and fall or the second lifting mechanism used to drive the movable smoke hood to rise and fall, the power output end of the range hood is basically rigidly fixed to the above-mentioned hood body by screws. However, after the power output end of the lifting mechanism is rigidly fixed to the outside, its degree of freedom is limited, and it is impossible to adaptively adjust the deviation of the installation size. The disassembly and assembly are relatively cumbersome, which affects the installation efficiency. On the other hand, this installation method will also transmit the vibration generated by the lifting mechanism (generally using a motor as a driving source) to the hood body, causing a large noise problem. In addition, since the movable smoke hood of the range hood has an air inlet on the front side wall, the basic flow of smoke is that during the upward evaporation of the smoke, the smoke close to the air inlet side is sucked into the range hood, and the smoke away from the air inlet side evaporates upward and hits the smoke baffle plate, and the smoke diffuses to the front and rear sides. The smoke diffused backwards climbs down along the support plate to the air inlet and is finally sucked into the range hood.Due to the influence of the air inlet flow rate, the oil smoke that diffuses forward falls down and gathers in the oil smoke gathering area, and is finally sucked into the range hood. The applicant found that the opening position of the air inlet on the front side wall of the movable smoke hood, especially the distance between the air inlet and the smoke baffle of the body of the range hood and the setting state of the guide component at the air inlet of the movable smoke hood, have an important impact on whether the smoke can be quickly sucked into the smoke collecting chamber and effectively reduce the escape problem caused by the oil smoke hitting the smoke baffle. Therefore, a reasonable design is required. In addition, since the wind cabinet of the range hood is covered on the outer periphery of the smoke hood, it is easy to cause the oil stains in the wind cabinet to leak from the connection position with the smoke hood, and the size of the wind cabinet is usually adapted to the kitchen wall cabinet, and its width in the left and right directions is small, so the smoke hood does not match the household stove, and the oil smoke easily escapes from the left and right sides. If the width of the wind cabinet and the smoke hood is expanded, the wind cabinet will not be able to adapt to the kitchen wall cabinet, causing inconvenience in installation. Summary of the invention

[0008] The first technical problem to be solved by the present invention is to provide a range hood in which the oil inside the range hood can be smoothly introduced into the oil cup through the lower box and a pressure stabilizing chamber can be constructed inside the lower box in response to the above-mentioned existing technical status.

[0009] The second technical problem to be solved by the present invention is to provide a range hood in which the oil inside the range hood can be introduced into the oil cup through the lower box body and the air inlet body in turn, in response to the above-mentioned existing technical status.

[0010] The technical solution adopted by the present invention to solve the first technical problem mentioned above is: the lifting type range hood comprises an upper box body, a lower box body and an air inlet body, the lower box body is arranged on the upper box body, the air inlet body is arranged on the lower box body, the air inlet body is provided with a smoke inlet, and an oil cup is installed at the bottom of the air inlet body, characterized in that: the lower box body has a first oil guide member, the first oil guide member has a first side, a second side and a third side, the left and right sides of the lower box body have mounting plates, the first side is directly or indirectly connected to the left mounting plate, the second side is directly or indirectly connected to the right mounting plate, and the third side is directly or indirectly connected to the front side panel of the lower box body, the left and right mounting plates, the first oil guide member and the front side panel of the lower box body constitute an air inlet cavity in the lower box body, and the oil in the upper box body enters the oil cup through the first oil guide member.

[0011] The first oil guide piece serves as the bottom surface of the air inlet cavity. The oil on the left, right and front sides of the lower box can flow to the first oil guide piece, and the first oil guide piece guides the oil to the oil cup. After the oil smoke enters the air inlet body, it enters the air inlet cavity of the lower box, and airflow buffering is achieved in the air inlet cavity. Therefore, the first oil guide piece can not only guide the oil, but also build a place for airflow buffering in the lower box. The side of the first oil guide piece is connected to the corresponding plate body to form a sealed cavity, which reduces the influence of the airflow on the trajectory of the oil droplets and avoids the splashing of the oil droplets dripping from the volute. In addition, the lifting range hood can guide the oil of the lower box and the air inlet body through an oil cup, and the oil in the lower box will not overflow from the gap between the lower box and the air inlet body.

[0012] In order to allow the oil on the first oil guide member to flow smoothly into the oil cup, preferably, the projection of the rear edge of the first oil guide member in the vertical direction falls into the oil cup.

[0013] Further preferably, the rear edge of the first oil guide member has an oil guide fold extending rearward and downward, and the projection of the rear edge of the oil guide fold in the vertical direction falls into the oil cup.

[0014] In order to allow the oil on the first oil guide member to flow out smoothly, the oil guide fold has oil leakage notches distributed at intervals.

[0015] In order to allow the oil on the fan to smoothly fall onto the first oil guide member, a fan is installed in the upper box body, and the fan is located above the first oil guide member.

[0016] In order to allow the oil on the first oil guide member to be smoothly discharged, the first oil guide member is arranged to be tilted downward from front to back.

[0017] Preferably, the inclination angle α of the first oil guiding member relative to the horizontal plane is in the range of 0°<α≤10°.

[0018] Further preferably, the middle portion of the first oil guide member has a concave oil collecting groove, and the oil collecting groove can guide the oil downward in an orderly manner, thereby improving the cleanliness and oil drainage efficiency inside the entire machine.

[0019] Further preferably, the bottom surface of the oil collecting groove is inclined relative to the first oil guiding member.

[0020] Further preferably, the lower box body can perform lifting and lowering movements relative to the upper box body, and a fan is installed in the upper box body. When the lower box body rises to the highest point along the upper box body, the bottom of the fan is placed in the oil collecting trough, thereby avoiding interference between the first oil guide member and the volute, increasing the rising height of the lower box body, reducing the height of the entire machine, improving the adaptability and convenience of installation, and saving manufacturing costs.

[0021] Preferably, a lower front plate is installed on the rear side of the first oil guide member, the lower front plate is vertically arranged, and an air inlet channel connected to the air inlet cavity is formed between the lower front plate and the rear plate of the lower box body, and the air inlet channel is located at the rear and lower part of the air inlet cavity. In this way, because the front-to-back width of the air inlet channel is narrow and the oil smoke flow rate is fast, the external flow field can be driven to pull the airflow faster, giving the oil smoke a greater backward speed in the same time to prevent the oil smoke from escaping, and the wide air inlet cavity is located downstream of the air inlet channel. The air inlet cavity can construct an efficient pressure stabilizing cavity, so that the airflow is buffered and stabilized in the pressure stabilizing cavity, thereby helping to improve the oil smoke absorption effect. At the same time, the principle of resistive silencing is simulated. When the noise enters the air inlet cavity from the air inlet channel, the sound wave is reflected, thereby achieving the purpose of silencing.

[0022] Further preferably, the rear edge of the first oil guide member has an oil guide fold extending rearward and downward, the oil guide fold protruding backward from the lower front plate, and the projection of the rear edge of the oil guide fold in the vertical direction falls into the oil cup.

[0023] In order to guide the oil on the rear side of the lower front plate into the oil cup, the bottom of the lower front plate has a lower folded edge bent backward and downward, and the rear edge of the lower folded edge is projected in the vertical direction into the oil cup.

[0024] More preferably, the projection of the front side of the upper box in the vertical direction falls on the first oil guide member, that is, the range hood adopts a structure in which the lower box wraps the upper box, ensuring that the oil in the upper box smoothly falls onto the first oil guide member.

[0025] Further preferably, a fan is installed in the upper box body.

[0026] The technical solution adopted by the present invention to solve the second technical problem is: the air inlet body has a second oil guide member, the first oil guide member cooperates with the second oil guide member, and the oil on the first oil guide member can flow into the oil cup through the second oil guide member. In this way, the oil inside the range hood is introduced into the oil cup through the first oil guide member and the second oil guide member in sequence.

[0027] The second oil guide member may have a variety of structures. Preferably, the second oil guide member is a grid plate. The grid plate is arranged to be inclined downward from front to back, and the grid plate has an oil guide surface.

[0028] In order to allow the oil guided by the first oil guide member to flow smoothly to the second oil guide member, the projection of the rear edge of the first oil guide member in the vertical direction falls onto the oil guide surface.

[0029] Further preferably, the rear edge of the first oil guiding member has an oil guiding fold extending rearward and downward, and the projection of the rear edge of the oil guiding fold in the vertical direction falls onto the oil guiding surface.

[0030] Preferably, a lower front plate is vertically installed on the rear side of the first oil guide, the grille plate is arranged on the rear side of the lower front plate, and the air inlet body moves up and down along the lower front plate. Thus, when the air inlet body descends, the negative pressure area descends, thereby improving the oil fume absorption effect.

[0031] In order to prevent oil smoke from leaking out and prevent pressure release, preferably, a front sealing strip is installed on the front side of the grille plate, and the front edge of the front sealing strip is close to the rear side of the lower front plate. In this way, when the air inlet body is descending, a certain degree of sealing structure is formed between the front sealing strip and the lower front plate.

[0032] The front sealing strip can have a variety of installation structures. Preferably, to facilitate the installation of the front sealing strip, an upper guide plate is installed at the front bottom of the grille plate, and the front sealing strip is clamped between the grille plate and the upper guide plate. The upper guide plate is vertically arranged above the smoke inlet to restrict the size of the smoke inlet. The height of the smoke inlet is lowered by the upper guide plate, so that the oil is sucked in when it is still at a certain distance from the lower box body. On the one hand, it can reduce the condensed oil on the surface of the lower box body, and on the other hand, it can reduce the escape of oil smoke.

[0033] In order to further prevent pressure release and ensure the effect of absorbing oil smoke, the top of the upper guide plate has an upper folded edge bent forward and upward, and the bottom of the lower front plate has a lower folded edge bent backward and downward. The lower folded edge and the upper folded edge have opposite surfaces. When the air inlet body is lowered to the lowest position, the opposite surfaces of the lower folded edge and the upper folded edge are abutted or close to each other to form a surface seal between the upper guide plate and the lower front plate. When the distance between the lower folded edge and the upper folded edge is less than 10mm, a surface seal is formed, that is, the channel formed between the lower folded edge and the upper folded edge can maintain a large wind resistance, effectively preventing oil smoke from entering the channel and preventing pressure release. In this way, the lower folded edge of the lower front plate cooperates with the upper folded edge of the upper guide plate, and the probability of airflow pressure release from the small gap between the front sealing strip and the vertical plane of the lower front plate is further reduced during the descent of the air inlet body.

[0034] The air inlet body can be raised and lowered relative to the lower box body, the first oil guide member has a concave oil collecting groove in the middle, the front side of the grille plate has an upwardly folded flange, and the middle position of the flange is provided with a gap for avoiding the oil collecting groove. When the air inlet body rises to the highest position along the lower box body, the grille plate avoids the concave oil collecting groove in the first oil guide member to avoid interference between the grille plate and the first oil guide member, thereby increasing the rising height of the air inlet body and facilitating the air inlet body to be hidden in the lower box body.

[0035] In order to make the grille plate play a better role in guiding oil, the grille plate has oil guiding channels arranged at intervals, and the width of the oil guiding channels in the middle area is greater than the width of the oil guiding channels in the left and right areas of the grille plate. In this way, the air inlet area in the middle area of ​​the grille plate is relatively small, and the air inlet area in the left and right areas is relatively large. Since the left and right areas correspond to the stove eyes on the left and right sides of the stove, the flow distribution can be better achieved. It is further preferred that the oil guiding channel in the middle area corresponds to the oil collecting tank. In this way, the oil guiding channel in the middle area can smoothly receive the oil coming out of the oil collecting tank. In this way, the oil flowing down from the oil collecting tank on the first oil guiding member can enter the wider oil guiding channel in the middle, and the oil flowing down from other positions on the first oil guiding member enters the narrower oil guiding channel in the middle, so as to achieve reasonable oil guiding zoning.

[0036] In order to allow the oil on the grid plate to flow smoothly into the oil cup, the grid plate is tilted downward from front to back, and an oil leakage hole is opened at the lowest position of the rear of the grid plate. The projection of the oil leakage hole in the vertical direction falls into the oil cup.

[0037] The third technical problem to be solved by the present invention is to provide a lifting range hood with a two-stage lifting structure in response to the above-mentioned existing technical status, and the oil in the upper box body can be introduced into the oil cup through the lower box body and the air inlet body in sequence.

[0038] The technical solution adopted by the present invention to solve the above-mentioned third technical problem is: the lifting type range hood includes an upper box body, a lower box body and an air inlet body, the lower box body is arranged on the upper box body, the air inlet body is arranged on the lower box body and can make a lifting movement relative to the lower box body, and an oil cup is installed at the bottom of the air inlet body, which is characterized in that: the lower box body has a first oil guide channel, the projection of the front side surface of the upper box body in the vertical direction falls into the first oil guide channel, the air inlet body has a second oil guide channel connected to the oil circuit of the first oil guide channel, and the oil in the upper box body can enter the oil cup through the first oil guide channel and the second oil guide channel in sequence.

[0039] The lifting type range hood includes a lower box body arranged on the upper box body, an air inlet body arranged on the lower box body and capable of lifting and lowering movement relative to the lower box body, the lower box body having a first oil guide channel, the projection of the front side surface of the upper box body in the vertical direction falls into the first oil guide channel, and the air inlet body having a second oil guide channel connected to the oil path of the first oil guide channel, thereby, the oil in the upper box body can enter the oil cup at the bottom of the air inlet body through the first oil guide channel and the second oil guide channel in sequence, effectively solving the oil path problem of the lifting type range hood and preventing the oil in the upper box body from dripping directly onto the stove.

[0040] The first oil guiding channel can have a variety of structures. Preferably, the first oil guiding channel includes an upper front plate with an L-shaped structure, the upper front plate is fixed inside the lower box body, and the upper front plate has a vertically arranged first plate body and a second plate body bent backward from the lower edge of the first plate body.

[0041] Further preferably, the first plate body is close to the front wall of the lower box body, and the second plate body is arranged in the middle area of ​​the lower box body in the height direction.

[0042] In order to enable the first oil guide channel to receive the oil dripping from the fan, a fan is installed in the upper box body, and the fan is arranged above the second plate body.

[0043] In order to allow the oil falling onto the second plate body to be smoothly discharged, the first plate body is arranged vertically, and the second plate body is arranged obliquely downward from front to back.

[0044] More preferably, the inclination angle of the second plate relative to the horizontal plane is in the range of 0° to 10°.

[0045] Further preferably, the middle part of the second plate body has a concave oil collecting groove. The concave oil collecting groove has a better oil collecting effect.

[0046] It is further preferred that a fan is installed in the upper box body, the fan is arranged above the second plate body, the lower box body can move up and down relative to the upper box body, and when the lower box body rises to the highest position, the bottom of the fan is placed in the oil collecting tank. In this way, the oil collecting tank can avoid interference with the volute after the whole machine is folded, reduce the height of the whole machine, improve the adaptability and convenience of installation, and save manufacturing costs; on the other hand, the concave oil collecting tank is equivalent to an oil collecting chamber, which guides the oil of the fan downward in an orderly manner, avoids disorderly guidance of the oil in the fan, and improves the cleanliness and oil discharge efficiency inside the whole machine.

[0047] It is further preferred that a lower front plate is installed on the rear side of the second plate body, the lower front plate is vertically arranged, and the air inlet body can move up and down along the lower front plate. Thus, a wider upper air inlet channel is formed between the upper front plate and the rear plate of the lower box body, and a narrower lower air inlet channel is formed between the lower front plate and the rear plate of the lower box body. After the oil smoke enters from the air inlet body, it passes through the lower air inlet channel and the upper air inlet channel in sequence and is sucked into the fan. Since the front-to-back width of the lower air inlet channel is narrow, the oil smoke flow rate is fast, which can drive the external flow field to achieve faster pulling of the airflow, give the oil smoke a greater backward speed in the same time, and prevent the oil smoke from escaping. The upper air inlet channel can construct an efficient pressure stabilizing chamber, so that the airflow is buffered and stabilized in the pressure stabilizing chamber, thereby facilitating the improvement of the oil smoke absorption effect.

[0048] In order to allow the oil on the lower front plate to flow smoothly into the oil cup, the bottom of the lower front plate has a lower folded edge bent backward and downward, and the projection of the rear edge of the lower folded edge in the vertical direction falls into the oil cup.

[0049] The second oil guide channel can have a variety of structures. Preferably, the second oil guide channel includes a grid plate, which is arranged obliquely downward from the front to the back, and has an oil guide surface. The vertical projection of the rear edge of the second plate body falls on the oil guide surface. In this way, the oil flowing out of the first oil guide channel can smoothly enter the second oil guide channel.

[0050] Further preferably, the rear edge of the second plate body extends downwardly and rearwardly with an oil guiding edge, and the projection of the rear edge of the oil guiding edge in the vertical direction falls on the oil guiding surface, so that the oil from the second plate body can drip smoothly onto the grid plate.

[0051] In order to prevent the oil from flowing along the edge when the range hood is hung and tilted left or right, the rear edge of the oil guide fold is provided with oil leakage notches distributed at intervals.

[0052] Further preferably, a lower front plate is installed on the rear side of the second plate body, the lower front plate is arranged vertically, and the grille plate is arranged on the rear side of the lower front plate. When the air inlet body moves upward relative to the lower box body, the grille plate moves from the lower part of the lower front plate to the upper part of the lower front plate. In this way, during the lifting and lowering process of the air inlet body, the grille plate can cooperate with the lower front plate, and a line seal can be formed between the grille plate and the lower front plate, thereby reducing the probability of oil smoke leakage.

[0053] In order to further prevent pressure release and ensure the oil fume absorption effect, the air inlet body has a smoke inlet, an upper guide plate is installed at the front bottom of the grille plate, the upper guide plate is vertically arranged above the smoke inlet, the bottom of the lower front plate has a lower folded edge bent backward and downward, the top of the upper guide plate has an upper folded edge bent forward and upward, the lower folded edge and the upper folded edge have opposite surfaces, and when the lower box body is lowered to the lowest position, the lower folded edge and the upper folded edge are against or close to each other to form a surface seal between the upper guide plate and the lower front plate. In this way, the lower folded edge of the lower front plate cooperates with the upper folded edge of the upper guide plate, and the probability of airflow pressure release from the small gap between the front sealing strip and the vertical plane of the lower front plate is further reduced during the descending process of the air inlet body.

[0054] Further preferably, the air inlet body has a smoke inlet, an upper guide plate is installed at the bottom of the front side of the grille plate, the upper guide plate is vertically arranged above the smoke inlet, and a front sealing strip is installed at the front side of the grille plate, the front sealing strip is clamped between the grille plate and the upper guide plate, and the front edge of the front sealing strip is close to the rear side of the lower front plate, that is, the distance between the front edge of the front sealing strip and the rear side of the lower front plate is within the range of 0-10mm. In this way, during the lifting and lowering process of the air inlet body, a certain degree of sealing structure is formed between the front sealing strip and the lower front plate to prevent pressure release, and when the front edge of the front sealing strip contacts the rear side of the lower front plate, the front sealing strip on the grille plate can scrape off the condensed oil on the rear side of the lower front plate.

[0055] In order to avoid interference between the grille plate and the second plate body of the upper front plate in the non-working state, the middle part of the second plate body has a concave oil collecting groove, the front side of the grille plate has an upward folded flange, and the middle position of the flange is provided with a makeshift gap for avoiding the oil collecting groove.

[0056] In order to make the grid plate play a better role in guiding oil, the grid plate has oil guiding channels arranged at intervals, and the width of the oil guiding channels in the middle area is greater than the width of the oil guiding channels in the left and right areas of the grid plate. In this way, the oil guiding channels in the middle area can smoothly receive the oil coming out of the oil collecting tank.

[0057] In order to smoothly guide the oil on the grid plate to the oil cup, an oil leakage hole is opened at the lowest position of the rear part of the grid plate, and the projection of the oil leakage hole in the vertical direction falls into the oil cup.

[0058] The fourth technical problem to be solved by the present invention is to provide a lifting type range hood in which the oil of the fan system can flow smoothly into the oil cup in view of the above-mentioned existing technical status.

[0059] The technical solution adopted by the present invention to solve the fourth technical problem mentioned above is: the lifting type range hood includes an upper box body, a lower box body and an air inlet body, the lower box body is arranged on the upper box body and can make a lifting movement relative to the upper box body, the air inlet body is arranged on the lower box body, an oil cup is installed at the bottom of the air inlet body, and a range fume exhaust fan is installed in the upper box body, the range fume exhaust fan has an oil leakage hole, and is characterized in that: an oil guide plate extending from front to rear is provided inside the lower box body, the oil guide plate has a concave oil collecting trough structure, the vertical projection of the oil leakage hole falls on the oil collecting trough structure, and the oil falling into the oil collecting trough structure can be introduced into the oil cup.

[0060] The lower box body of the lift-type range hood is provided with a transversely arranged oil guide plate, on which a concave oil collecting trough structure is formed. The oil collecting trough structure can, on the one hand, avoid interference with the fan volute after the whole machine is folded, thereby reducing the height of the whole machine, improving the adaptability and convenience of installation, and saving manufacturing costs. On the other hand, the concave oil collecting trough structure is equivalent to an oil collecting chamber, which guides the oil of the fan system downwardly and into the oil cup in an orderly manner, thereby avoiding disorderly discharge of the oil in the fan system and improving the cleanliness and oil discharge efficiency inside the whole machine.

[0061] Preferably, when the lower box is raised to the highest position, the bottom of the range hood fan extends into the oil collecting tank structure. In this way, the oil collecting tank structure can not only receive the oil of the fan system, but also be used as an escape space, which is conducive to reducing the height of the range hood.

[0062] In order to allow the oil of the fan system to drip smoothly into the oil collecting tank structure, the oil collecting tank structure is arranged in the middle area of ​​the oil guide plate.

[0063] The oil guide plate can have a variety of installation structures. Preferably, the oil guide plate has a first side, a second side and a third side. The left and right sides of the lower box body have mounting plates. The first side is directly or indirectly connected to the left mounting plate, the second side is directly or indirectly connected to the right mounting plate, and the third side is directly or indirectly connected to the front plate of the lower box body. The left and right mounting plates, the oil guide plate and the front plate of the lower box body form an air inlet cavity in the lower box body. In this way, on the one hand, the oil guide plate receives the oil inside the range hood, and the oil enters the oil cup at the bottom of the air inlet body through the oil guide plate. On the other hand, the oil guide plate constitutes the bottom surface of the air inlet cavity, and a pressure stabilizing cavity for airflow buffering is constructed inside the lower box body, providing a buffering space for oil smoke, which can not only improve the oil smoke absorption effect, but also reduce the influence of airflow on the trajectory of oil droplets, avoid splashing of oil droplets dripping from the volute, and help maintain the cleanliness of the interior of the range hood.

[0064] In order to guide the oil flowing out of the oil guide plate into the oil cup, preferably, the air inlet body has an oil filter plate, and the oil filter plate is arranged on the rear side of the oil guide plate. The oil filter plate has an oil guide surface, and the projection of the rear edge of the oil guide plate in the vertical direction falls on the oil guide surface. The oil falling from the oil guide plate onto the oil filter plate can flow into the oil cup.

[0065] In order to facilitate the oil on the oil guide plate to flow out, the oil guide plate is arranged to be tilted downward from front to back.

[0066] In order to further improve the oil guiding effect of the oil guide plate, it is further preferred that the rear portion of the oil guide plate has a downwardly bent oil guiding fold, and the projection of the rear edge of the oil guiding fold in the vertical direction falls onto the oil guiding surface.

[0067] In order to prevent the oil from flowing along the rear edge of the oil guide plate when the range hood is hung and tilted left or right, the rear edge of the oil guide fold is provided with oil leakage notches distributed at intervals.

[0068] In order to smoothly guide the oil on the oil filter plate into the oil cup, the oil filter plate has oil guide channels arranged at intervals on the left and right, and the width of the oil guide channels in the middle area is greater than the width of the oil guide channels on the left and right sides of the oil filter plate. The oil guided out from the oil collecting tank structure enters the oil guide channels in the middle area.

[0069] Further preferably, an oil leakage port is opened at the lowest position of the oil guide channel, and the projection of the oil leakage port in the vertical direction falls within the oil cup.

[0070] In order to prevent the oil on the upper box from flowing out of the lower box, the projection of the front side of the upper box in the vertical direction falls on the oil guide plate. In this way, the structure of the lower box wrapping the upper box is adopted, so that the oil on the upper box can smoothly flow into the oil guide plate inside the lower box.

[0071] In order to facilitate the discharge of the oil that has fallen into the oil collecting tank structure, the bottom surface of the oil collecting tank structure is inclined downward from front to back relative to the horizontal plane.

[0072] The fifth technical problem to be solved by the present invention is to provide a lifting range hood in which the oil on the inner wall of the air inlet channel of the lower box body can be smoothly scraped off into the oil cup in response to the above-mentioned existing technical status.

[0073] The technical solution adopted by the present invention to solve the fifth technical problem mentioned above is: the lifting type range hood includes a lower box body and an air inlet body, the air inlet body is arranged on the lower box body and can make a lifting movement relative to the lower box body, an oil cup is installed at the bottom of the air inlet body, and its characteristics are: the lower box body has an air inlet channel for the lifting of the air inlet body, the air inlet body has a scraper, and during the lifting process of the air inlet body, the scraper can scrape the oil on the inner wall of the air inlet channel into the oil cup.

[0074] The air inlet body of the lifting type range hood is arranged in the lower box body. The upper and lower boxes have air inlet channels for the air inlet body to be lifted and lowered. During the lifting process of the air inlet body, the scraping member on the air inlet body can scrape the oil on the inner wall surface of the air inlet channel into the oil cup, making the inner wall surface of the air inlet channel cleaner, that is, realizing self-cleaning of the air inlet channel, eliminating the trouble of disassembling the machine for cleaning.

[0075] In order to scrape the oil stains on the wall surface of the lower front plate of the lower box body into the oil cup, the lower box body has a lower front plate, and the lower front plate constitutes the front wall of the air inlet channel. The air inlet body has a mounting plate that moves synchronously with the air inlet body, and the mounting plate is arranged on the rear side of the lower front plate. The scraper includes a front scraper installed on the front side of the mounting plate, and the front scraper is used to scrape the oil on the wall surface of the lower front plate into the oil cup.

[0076] In order to effectively scrape off the oil on the wall surface of the lower front plate, the lower front plate has a vertical surface that matches the front scraping member.

[0077] In order to allow the oil scraped from the lower front plate to flow smoothly into the oil cup, a lower folded edge is extended rearward and downward from the lower edge of the lower front plate, and the projection of the edge of the lower folded edge in the vertical direction falls into the oil cup.

[0078] Preferably, the mounting plate is an oil filter plate arranged on the top of the air inlet body, and the oil filter plate is arranged obliquely downward from front to back. In this way, the mounting plate plays the role of installing the scraper on the one hand, and also plays the role of filtering oil on the other hand.

[0079] The front scraper can have a variety of installation structures. Preferably, the air inlet body has a smoke inlet, and an upper guide plate is installed at the front bottom of the oil filter plate. The upper guide plate is vertically arranged above the smoke inlet, and the front scraper is a front sealing strip installed between the oil filter plate and the upper guide plate.

[0080] In order to allow the scraped oil to flow down through the oil leakage notch on the front sealing strip, a front oil leakage notch is provided at the front side edge of the front sealing strip.

[0081] Further preferably, the bottom of the lower front plate has a lower folded edge bent backward and downward, the top of the upper air guide plate has an upper folded edge bent forward and upward, the lower folded edge and the upper folded edge have opposing surfaces, and when the lower box body is lowered to the lowest position, the opposing surfaces of the lower folded edge and the upper folded edge abut or approach each other to form a surface seal between the upper air guide plate and the lower front plate. In this way, the lower folded edge of the lower front plate cooperates with the upper folded edge of the upper air guide plate, and the probability of airflow pressure relief from the small gap between the front sealing strip and the vertical plane of the lower front plate is further increased during the descending process of the air inlet body, which is conducive to improving the oil fume absorption effect.

[0082] Further preferably, an upper box body is included, and the lower box body is arranged on the upper box body. Usually, the fan system can be installed inside the upper box body.

[0083] In order to scrape the oil on the back plate of the lower box body into the oil cup, the lower box body has a back plate, the air inlet body has an oil filter plate that moves synchronously with the air inlet body, the oil filter plate is arranged on the front side of the back plate, and the scraper includes a rear scraper installed on the rear side of the oil filter plate, and the rear scraper is used to scrape the oil on the wall surface of the back plate into the oil cup.

[0084] Further preferably, the back plate forms the rear wall of the air inlet channel, and the projection of the lower edge of the back plate in the vertical direction falls into the oil cup. In this way, the oil on the inner wall of the back plate can flow smoothly into the oil cup.

[0085] In order to allow the scraped oil to flow down through the oil leakage gap on the rear sealing strip, the rear scraping member is a rear sealing strip installed on the rear side of the oil filter plate, and a rear oil leakage gap is opened on the rear edge of the rear sealing strip.

[0086] The sixth technical problem to be solved by the present invention is to provide a range hood with high oil exhaust efficiency, in which the oil on the oil guide plate can be orderly introduced into the oil cup, in view of the above-mentioned existing technical status.

[0087] The technical solution adopted by the present invention to solve the sixth technical problem mentioned above is: the range hood, a lower box body and an air inlet body, the air inlet body is arranged on the lower box body, and an oil cup is installed at the bottom of the air inlet body, characterized in that: an oil guide plate extending from front to rear is installed inside the lower box body, and the oil guide plate is formed with a concave profile structure, and a grille plate is installed on the air inlet body, and the grille plate is arranged on the rear side of the oil guide plate, and the grille plate has oil guide channels distributed in the front and rear directions, and the oil guide channels are arranged at intervals in the left and right directions, and the width of the oil guide channels corresponding to the profile structure is greater than the width of the oil guide channels corresponding to the area outside the profile structure, and the oil on the oil guide plate flows into the oil cup through the oil guide channel.

[0088] The oil guide plate of the range hood extends from front to back and is formed with a concave profiled structure. The grille plate is arranged on the rear side of the oil guide plate and has an oil guide channel. The width of the oil guide channel corresponding to the profiled structure is greater than the width of the oil guide channel corresponding to the area outside the profiled structure. Therefore, the oil held in the profiled structure can flow into the oil cup through the wider oil guide channel, and the oil can be orderly and concentratedly discharged downward into the oil cup, thereby improving the cleanliness and oil discharge efficiency inside the entire machine.

[0089] Preferably, the profiled structure is provided in the middle area of ​​the oil guide plate in the left and right directions, and correspondingly, the width of the oil guide channel in the middle area is greater than the width of the oil guide channel in the left and right side areas.

[0090] In order to allow all the oil on the oil guide plate to be introduced into the grid plate, the left-right width of the grid plate is greater than the left-right width of the oil guide plate.

[0091] The oil guide plate may have a variety of mounting structures. Preferably, the oil guide plate is connected and fixed to the inner wall of the lower box body and / or the mounting plate inside the lower box body.

[0092] Further preferably, the oil guide plate has a first side, a second side and a third side, the lower box body has mounting plates on the left and right sides, the first side is directly or indirectly connected to the left mounting plate, the second side is directly or indirectly connected to the right mounting plate, the third side is directly or indirectly connected to the front plate of the lower box body, and the mounting plates on the left and right sides, the oil guide plate and the front plate of the lower box body form an air inlet cavity in the lower box body. In this way, on the one hand, the oil guide plate receives the oil inside the range hood, and the oil enters the oil cup at the bottom of the air inlet body through the oil guide plate. On the other hand, the oil guide plate constitutes the bottom surface of the air inlet cavity, and a pressure stabilizing cavity for airflow buffering is constructed inside the lower box body, providing a buffering space for oil smoke, which can not only improve the oil smoke absorption effect, but also reduce the influence of airflow on the trajectory of oil droplets, avoid splashing of oil droplets dripping from the volute, and help maintain the cleanliness of the interior of the range hood.

[0093] In order to allow the oil on the oil guide plate to flow smoothly into the oil guide channel of the grille plate, the front side of the grille plate has an oil guide surface, the oil guide channels are arranged on the rear side of the oil guide surface and are interconnected, and the projection of the rear edge of the oil guide plate in the vertical direction falls on the oil guide surface.

[0094] In order to further improve the oil guiding effect of the oil guide plate, the rear portion of the oil guide plate has a downwardly bent oil guiding edge, and the projection of the rear edge of the oil guiding edge in the vertical direction falls on the oil guiding surface.

[0095] In order to prevent the oil from flowing along the rear edge of the oil guide plate when the range hood is hung and tilted left or right, the rear edge of the oil guide fold is provided with oil leakage notches distributed at intervals.

[0096] In order to facilitate the oil on the oil guide plate to be introduced backward into the grid plate, the oil guide plate is arranged to be tilted downward from front to back.

[0097] In order to allow the oil on the grid plate to flow smoothly into the oil cup, the grid plate is arranged obliquely downward from front to back, an oil leakage port is opened at the lowest position of the oil guide channel, and the projection of the oil leakage port in the vertical direction falls into the oil cup.

[0098] More preferably, the range hood further comprises an upper box body, and the lower box body is arranged on the upper box body. Usually, the range hood fan is installed inside the upper box body.

[0099] In order to facilitate the discharge of the oil that has fallen into the profiled structure, the bottom surface of the profiled structure is inclined downward from front to back relative to the horizontal plane.

[0100] The seventh technical problem to be solved by the present invention is to provide a lifting range hood that avoids interference between upper and lower oil guide parts when the air inlet body is raised to the highest position in response to the above-mentioned existing technical status.

[0101] The technical solution adopted by the present invention to solve the seventh technical problem mentioned above is: the lifting type range hood includes a lower box body and an air inlet body, the air inlet body is arranged on the lower box body and can perform lifting and lowering movements relative to the lower box body, and is characterized in that: the lower box body has a first oil guide member, the air inlet body has a second oil guide member, the second oil guide member rises and falls with the rising and falling of the air inlet body, and when the air inlet body rises to the highest position, the second oil guide member is located below the first oil guide member.

[0102] The lower box body of the lift-type range hood has a first oil guide member, and the air inlet body has a second oil guide member, and the second oil guide member and the air inlet body are lifted and lowered synchronously. Because the second oil guide member is located below the first oil guide member when the air inlet body rises to the highest position, mutual interference between the first oil guide member and the second oil guide member can be avoided, thereby ensuring that the air inlet body can be lifted and lowered freely.

[0103] In order to allow the oil on the first oil guide member to flow down smoothly along the rear edge, the rear edge of the first oil guide member has an oil guide fold, and the oil guide fold extends rearward and downward.

[0104] In order to enable the first oil guide member to receive more oil, the first oil guide member has a transversely arranged plate body, the plate body has a concave pressed structure, and the rear part of the pressed structure is formed with the oil guide fold.

[0105] The second oil guide member can have a variety of structures. Preferably, the second oil guide member is a grille plate, and a notch is provided on the front side of the grille plate to avoid the profile structure. In this way, by providing the notch to avoid the profile structure, the air inlet body can be raised to the highest position as much as possible, so that the air inlet body can be hidden inside the lower box as a whole, making the structure of the range hood more compact and simple, and also helping to reduce the height of the range hood, so that the whole machine can be hidden in the cabinet, and the appearance is high.

[0106] Further preferably, the front side of the grille plate has an upwardly folded flange, and the clearance notch is located in the middle of the flange.

[0107] More preferably, it further comprises an upper box body, in which a fan is installed, and the lower box body can perform lifting movement relative to the upper box body.

[0108] In order to make the lower box body rise to the highest position as much as possible, when the lower box body rises to the highest position along with the upper box body, the bottom of the fan is placed in the profiled structure. Thus, the rising stroke of the lower box body can be increased to the maximum extent, so that the height of the range hood is reduced when not in operation, and the structure is more compact and simple, so that the whole machine can be hidden in the cabinet and has a high aesthetics.

[0109] In order to smoothly guide the oil on the first oil guide member to the grid plate, the grid plate has an oil guide surface, and the projection of the rear edge of the oil guide fold in the vertical direction falls on the oil guide surface.

[0110] In order to realize oil diversion on the grid plate, the grid plate has oil diversion channels arranged at intervals, and the width of the oil diversion channels in the middle area is greater than the width of the oil diversion channels in the left and right side areas of the grid plate.

[0111] Further preferably, the oil guide channel in the middle area corresponds to the profiled structure of the plate body. In this way, the oil received in the profiled structure can flow into the oil cup through the wider oil guide channel, and the oil can be guided downward to the oil cup in an orderly manner, thereby improving the cleanliness and oil discharge efficiency inside the whole machine.

[0112] The eighth technical problem to be solved by the present invention is to provide a lifting range hood that can effectively solve the sealing problem of oil smoke between the upper box body and the air inlet body in response to the above-mentioned existing technical status.

[0113] The technical solution adopted by the present invention to solve the eighth technical problem mentioned above is: the lifting type range hood includes a lower box body and an air inlet body, the air inlet body is arranged on the lower box body and can perform lifting and lowering movements relative to the lower box body, the air inlet body has an air inlet, and is characterized in that: a first sealing member is provided on the air inlet body, and a second sealing member is provided on the lower box body, the first sealing member is located above the second sealing member, and the vertical projection of the first sealing member at least partially overlaps with the second sealing member.

[0114] The air inlet body of the lifting type range hood is provided with a first seal, and the lower box body is provided with a second seal. The first seal is located above the second seal, and the vertical projection of the first seal at least partially overlaps with the second seal. Through the cooperation of the first seal and the second seal, the risk of oil smoke leaking from the gap between the lower box body and the air inlet body can be reduced, effectively solving the problem of sealing oil smoke between the upper box body and the air inlet body.

[0115] The first sealing member may have a variety of installation structures. Preferably, a grille plate is provided on the air inlet body, and the grille plate rises and falls with the air inlet body. The first sealing member is provided on the grille plate and is located at the front side of the grille plate.

[0116] Further preferably, an upper guide plate is installed at the front bottom of the grille plate, the upper guide plate is vertically arranged above the air inlet, the top of the upper guide plate has an upper folded edge bent forward and upward, and the first sealing member is the upper folded edge.

[0117] In order to form a line seal between the lower front plate and the upper guide plate, the lower box body is provided with a lower front plate, the lower front plate is vertically arranged, and the rear side of the lower front plate is close to the front edge of the upper folding edge. In this way, oil smoke can be prevented from leaking out and pressure relief can be prevented.

[0118] In order to further form a line seal between the lower front plate and the upper guide plate, the bottom of the lower front plate has a lower folded edge bent backward and downward, and the second sealing member is the lower folded edge. When the air inlet body is in the lowered state, the rear edge of the lower folded edge is close to the front side of the upper guide plate.

[0119] In order to further improve the sealing effect, the upper fold and the lower fold have opposite surfaces, and when the air inlet body is lowered to the lowest position, the upper fold and the lower fold are against or close to each other to form a surface seal. In this way, after the surface seal structure is formed, pressure release can be better prevented and the oil fume absorption effect can be ensured.

[0120] Further preferably, the upper fold edge and the lower fold edge have opposite surfaces, and the lower box body and the air inlet body rise and fall synchronously. When the lower box body and the air inlet body are both lowered to the lowest position, the opposite surfaces of the upper fold edge and the lower fold edge abut or approach to form a surface seal.

[0121] In order to allow the oil on the lower front plate to flow smoothly into the oil cup, an oil cup is installed at the bottom of the air inlet body, and the projection of the rear edge of the lower folded edge in the vertical direction falls into the oil cup.

[0122] In order to scrape the oil on the rear side of the lower front plate into the oil cup, a scraper is installed on the front side of the grille plate, the front edge of the scraper is close to the rear side of the lower front plate, and the scraper is clamped between the grille plate and the upper folding edge.

[0123] Further preferably, when the air inlet is at the lowest position, the lower edge of the upper guide plate is located below the bottom of the lower box. The upper guide plate can lower the height of the air inlet so that the oil smoke is sucked in when it is still at a certain distance from the lower box, which can reduce the condensed oil on the surface of the lower box and reduce oil smoke leakage.

[0124] The ninth technical problem to be solved by the present invention is to provide a lifting range hood that can solve the problem of the oil paths on the left and right sides inside the range hood in response to the above-mentioned existing technical status.

[0125] The technical solution adopted by the present invention to solve the ninth technical problem mentioned above is: the lifting type range hood comprises an upper box body, a lower box body and an air inlet body, the lower box body is arranged on the upper box body and can make a lifting movement relative to the upper box body, the air inlet body is arranged on the lower box body and can make a lifting movement relative to the lower box body, and an oil cup is installed at the bottom of the air inlet body, which is characterized in that: oil guide side plates are installed on the left and right sides of the inner part of the lower box body, a first oil guide part is installed inside the lower box body, and a second oil guide part is installed on the air inlet body, the oil in the upper box body can be guided into the first oil guide part and the second oil guide part through the inner wall of the oil guide side plate, the second oil guide part is located below the first oil guide part to receive the oil dripping from the first oil guide part, and the oil flowing from the oil guide side plate and the first guide part to the second oil guide part finally flows into the oil cup.

[0126] The lifting range hood is provided with oil guide side plates on the left and right sides of the lower box body, a first oil guide member is installed inside the lower box body, and a second oil guide member is installed on the air inlet body. The oil in the upper box body can be guided to the first oil guide member and the second oil guide member through the inner wall of the oil guide side plate, the oil on the first oil guide member can flow into the second oil guide member, and the oil gathered on the second oil guide member finally flows into the oil cup. On the one hand, the oil guide side plate improves the reliability of the connection of the whole machine and ensures the relative sealing of the flow channel, and is conducive to the gathering of oil and the improvement of the oil fume extraction effect. On the other hand, it effectively solves the problem of the left and right oil paths inside the range hood, which can prevent the oil in the upper box body from overflowing from the lower box body, and prevent the oil on the oil guide side plate inside the lower box body from flowing out to the outside of the air inlet body.

[0127] The oil guide side plate can have a variety of structures. Preferably, the oil guide side plate includes a vertically arranged inner plate, an intermediate plate extending obliquely downward from the lower edge of the inner plate from the inside to the outside, and an outer plate extending vertically downward from the outer edge of the intermediate plate. The inner plate is arranged on the outside of the upper box body, and the projection of the outer plate in the vertical direction falls on the first oil guide member and the second oil guide member. In this way, the oil on the left and right inner walls of the upper box body can only fall into the inner side of the inner plate, the oil on the inner plate flows to the outer plate, and the oil on the outer plate finally falls on the first oil guide member and the second oil guide member. The connection point between the oil guide side plate and the front and rear sides is not collinear, which is conducive to improving the stability and reliability of the whole machine connection.

[0128] In order to smoothly guide the oil on the outer plate of the oil guide side plate to the first guide plate and the second guide plate, the first oil guide member is a first oil guide plate extending from front to rear, and the second oil guide member is a second oil guide plate arranged at the rear and lower part of the first oil guide member. The outer plate has a front oil guide wall and a rear oil guide wall. The projection of the front oil guide wall in the vertical direction falls on the first oil guide plate, and the projection of the rear oil guide wall in the vertical direction falls on the second oil guide plate.

[0129] Further preferably, the second oil guide plate is a grid plate, the grid plate has a front oil guide surface and left and right oil guide surfaces, the first oil guide plate is arranged obliquely downward from front to back, the projection of the rear edge of the first oil guide plate in the vertical direction falls on the front oil guide surface, and the projection of the rear oil guide wall of the oil guide side plate in the vertical direction falls on the left and right oil guide surfaces. With such an arrangement, the oil falling on the first oil guide plate can drip onto the second oil guide plate, and the oil on the rear oil guide wall of the oil guide side plate can drip onto the second oil guide plate.

[0130] In order to allow the oil on the front oil guide wall of the oil guide side plate to flow smoothly into the first oil guide plate, the left edge and the right edge of the first oil guide plate both have an upper flange folded upward, and the lower edge of the front oil guide wall has an inner flange folded inward, and the inner flange is arranged on the inner side of the upper flange and adjacent to the first oil guide plate.

[0131] Further preferably, the lower edge of the inner fold is lower than the upper edge of the upper flange. This arrangement can prevent the oil flowing down the front oil guide wall of the oil guide side plate from overflowing from the first oil guide plate.

[0132] In order to allow the oil on the rear oil guide wall of the oil guide side plate to be guided to the second oil guide plate through the extensions on both sides of the air inlet body, the air inlet body includes an air inlet portion and extensions extending vertically upward from the left and right sides of the air inlet portion, the air inlet portion is arranged on the rear side of the first oil guide plate, the second oil guide plate is installed on the top of the air inlet portion, the rear oil guide wall is arranged on the inner side of the extension portion, and the projection of the inner wall surface of the extension portion in the vertical direction falls on the second oil guide plate.

[0133] Further preferably, when the air inlet body is lowered to the lowest position, the upper edge of the extension part is not lower than the lower edge of the rear oil guide wall. This arrangement can prevent the oil flowing down the rear oil guide wall from overflowing onto the outer wall of the extension part, thereby keeping the outside of the air inlet body clean.

[0134] In order to fix the oil guide side plate inside the upper box body, the front edge of the first oil guide plate has an upper front plate bent vertically upward, and the oil guide side plate has a front flange and a rear flange. The front flange is directly or indirectly fixed to the upper front plate, and the rear flange is directly or indirectly fixed to the back plate of the lower box body.

[0135] In order to make the installation structure of the oil guide side plate more secure, a folded edge is formed on the top edge of the inner side plate, and the folded edge is fixed to the top plate of the lower box body.

[0136] In order to achieve sealing between the oil guide side plate and the upper box body, the upper box body includes a fan frame and a decorative cover arranged on the outside of the fan frame, and sealing strips are installed on the left and right sides of the bottom of the fan frame. The inner side plate of the oil guide side plate is arranged on the outside of the decorative cover and is sealed with the fan frame through the sealing strip.

[0137] In order to prevent oil smoke from leaking at the connection between the oil guide side plate and the upper box body during operation, when the lower box body is lowered to the lowest position, the upper part of the inner plate of the oil guide side plate is sealed to the fan frame through the sealing strip.

[0138] In order to enable the lower box body and the air inlet body to move up and down synchronously, the lower box body and the air inlet body are driven by the driving mechanism to move up and down synchronously.

[0139] As a preferred embodiment of any of the above solutions, a fan system is installed inside the upper box.

[0140] The tenth technical problem to be solved by the present invention is to provide a lifting range hood that can effectively solve the sealing problem of oil smoke between the upper box body and the air inlet body in response to the above-mentioned existing technical status.

[0141] The eleventh technical problem to be solved by the present invention is to provide a lifting range hood that can effectively solve the sealing problem of oil smoke between the upper box body and the air inlet body in response to the above-mentioned existing technical status.

[0142] The technical solution adopted by the present invention to solve the tenth technical problem is: a lifting device for a range hood, the body of the range hood includes a first shell, a second shell connected to the first shell in a manner that can be moved up and down relative to the first shell, and an air inlet cavity connected to the second shell in a manner that can be moved up and down relative to the second shell, the lifting device includes a driving member and a transmission assembly, the transmission assembly has a power input end for transmission connection with the driving member, a first power output end for connecting to the second shell to drive the second shell to move up and down relative to the first shell, and a second power output end for connecting to the air inlet cavity to drive the air inlet cavity to move up and down relative to the second shell.

[0143] Since the two power output ends of the lifting device are respectively connected to the second shell and the air inlet cavity, and are powered by the same driving member, when the driving member is in motion, the second shell and the air inlet cavity can be driven to rise and fall synchronously. This driving method of realizing the two-stage telescopic lifting and lowering of the range hood body through a lifting device reduces the number of driving mechanisms and avoids the excessive number of driving mechanisms that occupy the internal space of the range hood. In the preferred embodiment, the lead of the two-stage screw (the first screw and the second screw) of the lifting device can be reasonably designed according to the stroke of the whole machine and the self-locking requirements, so that the stroke of the two-stage motion runs according to the set ratio, realizing the stable and reliable two-stage lifting and lowering motion of the whole machine.

[0144] Generally speaking, the transmission assembly of the lifting device can adopt various existing technologies such as a screw transmission assembly, a gear transmission assembly, a connecting rod transmission assembly, etc. In order to simplify the structure of the transmission assembly, make it more compact and further reduce the internal space occupied by the range hood, the transmission assembly includes:

[0145] a fixed arm defining a receiving chamber therein;

[0146] A first screw rod is transmission-connected to the power output end of the driving member and rotates around its own axis under the drive of the driving member. The first screw rod is threadedly connected to the fixed arm, so that when rotating around its own axis, it can drive the fixed arm to move linearly relative to the first screw rod;

[0147] A second screw rod is rotatably disposed in the accommodation chamber of the fixed arm, the second screw rod is axially hollow to form a mounting channel for the first screw rod to extend therein, the second screw rod can coaxially rotate with the first screw rod, and is displaced in the axial direction relative to the first screw rod;

[0148] A movable arm, connected in the accommodating chamber of the installation chamber and threadedly connected to the second screw rod, so as to slide linearly relative to the fixed arm under the drive of the second screw rod;

[0149] The first screw rod constitutes the power input end of the transmission assembly, the fixed arm is connected to the second shell to constitute the first power output end of the transmission assembly, and the movable arm is connected to the air inlet cavity to constitute the second power output end of the transmission assembly.

[0150] In order to realize the threaded connection between the fixed arm and the first screw rod and simplify the processing and assembly process, the first end of the fixed arm has a first installation opening that is connected to the accommodating chamber, and the first installation opening is provided with a first nut for threaded connection with the first screw rod. The "first nut" can be understood as a slider structure adapted to the thread of the first screw rod.

[0151] In order to realize the synchronous rotation of the first screw rod and the second screw rod and the relative sliding in the axial direction, a limit groove extending along its axial direction is provided in the installation channel of the second screw rod, and the first screw rod has a limit portion which can form a limit with the limit groove in the circumferential direction and can slide along the extension direction of the limit groove.

[0152] As an improvement, the first screw rod is provided with a spline as the limiting portion, and the installation channel of the second screw rod is provided with an axially extending spline groove as the limiting groove.

[0153] In order to realize the transmission cooperation between the movable arm and the second screw rod, the movable arm has a contracted state retracted into the accommodating chamber of the fixed arm relative to the extended state of the fixed arm, and the movable arm is axially hollow to form a make way chamber for the second screw rod to extend into.

[0154] In order to realize the threaded connection between the movable arm and the second screw rod and simplify the processing and assembly process, the movable arm has a first end located in the accommodation chamber of the fixed arm and a second end extending out of the accommodation chamber of the fixed arm and used to connect with the air inlet cavity. The first end of the movable arm is provided with a second installation opening that is connected to the clearance chamber, and the second installation opening is provided with a second nut for threaded connection with the second screw rod. The "second nut" can be understood as a slider structure adapted to the thread of the second screw rod.

[0155] In order to ensure the stability of the second screw rod in rotation in the fixed arm, the end of the second screw rod is rotatably connected to the accommodating chamber of the fixed arm through a bearing.

[0156] In order to achieve circumferential limitation of the movable arm and the fixed arm, the fixed arm is a sleeve member with a non-circular cross section, and the movable arm is also a sleeve member with a cross section consistent with that of the fixed arm.

[0157] As an improvement, the driving member is a driving motor arranged on the first shell.

[0158] Generally, the distance that the second housing moves up and down relative to the first housing is not consistent with the distance that the air inlet cavity moves relative to the second housing. In order to achieve that the second housing and the air inlet cavity can move synchronously into position when rising or falling, the pitch of the first screw rod is different from the pitch of the second screw rod, and the thread rotation direction of the first screw rod is the same as the thread rotation direction of the second screw rod. The pitch of the first screw rod and the pitch of the second screw rod can be reasonably selected according to the actual lifting distance of the second housing and the air inlet cavity.

[0159] The technical solution adopted by the present invention to solve the above-mentioned eleventh technical problem is: a range hood, comprising a first shell, a second shell connected to the first shell in a manner that can be moved up and down relative to the first shell, and an air inlet cavity connected to the second shell in a manner that can be moved up and down relative to the second shell, and also includes the above-mentioned lifting device for the range hood, the driving part of the lifting device is arranged on the first shell, the first power output end of the transmission assembly is connected to the second shell to drive the second shell to move up and down relative to the first shell, and the second power output end of the transmission assembly is connected to the air inlet cavity to drive the air inlet cavity to move up and down relative to the second shell.

[0160] In order to facilitate the telescopic and lifting between the first shell, the second shell and the air inlet cavity of the range hood and ensure that the volume of the three is smaller and more compact in the retracted state, the top of the second shell has a first opening for the first shell to enter and exit the second shell in the up and down directions, and the bottom of the second shell has a second opening for the air inlet cavity to enter and exit the second shell in the up and down directions.

[0161] In order to design the range hood as a whole to be close to the wall and avoid occupying too much kitchen space forward, the second opening is arranged at the bottom rear side of the second shell, and the rear side wall of the air inlet cavity and the rear side wall of the first shell are both arranged close to the rear side wall of the second shell.

[0162] In order to reduce the problem of oil smoke escape, the size of at least the bottom area of ​​the second shell in the front-to-back direction is larger than the size of the air inlet cavity in the front-to-back direction, so that the bottom part of the second shell located in the front part of the air inlet cavity forms a smoke barrier for collecting smoke.

[0163] Generally, the air inlet can also be set on the bottom wall of the air inlet cavity or on the bottom wall or the front side wall of the air inlet cavity at the same time. However, in order to more smoothly absorb and exhaust oil fumes, an air inlet is opened on the front side wall of the air inlet cavity. The air inlet cavity has a closed state in which the air inlet is moved upward into the second shell and the air inlet is closed, and an open state in which the air inlet is moved downward to expose the second shell and at least a part of the air inlet is opened.

[0164] In order to ensure the overall aesthetics of the range hood in the retracted state, when the air inlet cavity is in the closed state, the bottom wall of the air inlet cavity is substantially flush with the bottom wall of the second shell. The above structural design also enables the second shell and the air inlet cavity to rise to the designated position at the same time when rising, so as to achieve the effect of being flush with the cabinet. When descending, the large stroke of the two-stage drive allows the air inlet of the air inlet cavity to extend further downward, thereby improving the range hood absorbing effect.

[0165] In order to avoid the lifting device from contacting oil smoke as much as possible and improve its service life, a mounting groove extending vertically and independent of the inner cavity of the first shell is defined on the rear side wall of the first shell, and the driving member is arranged on the top wall of the first shell and connected to the transmission assembly located in the mounting groove.

[0166] In order to ensure the stability of the up and down movement between the first shell, the second shell and the air inlet cavity, the first shell and the second shell are slidably connected via a first guide rail pair, and the second shell and the air inlet cavity are slidably connected via a second guide rail pair.

[0167] In order to make the up and down movement between the first shell, the second shell and the air inlet cavity more stable, as an improvement, the first guide rail pairs have two groups, which are arranged on the left and right sides of the lifting device respectively, and the second guide rail pairs have two groups, which are also arranged on the left and right sides of the lifting device respectively.

[0168] As an improvement, two sets of the first guide rail pairs are respectively arranged at the corners of the left and right sides of the rear part of the first shell, and each set of the first guide rail pairs includes a first guide rail portion connected to the rear side wall of the first shell and a second guide rail portion connected to the left side wall or the right side wall of the first shell. Both sets of the first guide rail pairs adopt a mutually perpendicular guide rail pair structure, which can well limit the shaking of the whole machine in the front and back and left and right directions, and further improve the stability of the lifting process.

[0169] The twelfth technical problem to be solved by the present invention is to provide a lifting range hood that can simplify the disassembly and assembly process of the driving device and improve the installation efficiency in view of the current status of the prior art.

[0170] The thirteenth technical problem to be solved by the present invention is to provide a hook assembly for a range hood that can effectively reduce the transmission of vibration to the casing of the range hood and improve the noise problem in response to the current status of the prior art.

[0171] The technical solution adopted by the present invention to solve the above twelfth technical problem is: a lifting type range hood, comprising a body and a driving device arranged on the body, the body of the range hood comprising a first shell and a second shell arranged inside and outside and connected together in a relatively movable manner, the main body of the driving device is fixed relative to the first shell, the power output end of the driving device is connected to the second shell, and the power output end of the driving device is connected to the second shell through a hook assembly, and the hook assembly comprises:

[0172] A fixing seat, provided on one of the driving device and the machine body, and defining a position limiting channel thereon;

[0173] The hook body includes a mounting plate mounted on the other of the driving device and the second shell, and a hanging portion protruding from the mounting plate and extending away. The hanging portion is bent into a hook portion at the end away from the mounting plate. The hook portion extends into the limiting channel of the fixing seat and then buckles at the corresponding edge of the limiting channel.

[0174] When the hook body and the fixed seat of the hook assembly are being installed, the hook body can be slightly tilted at a certain angle so that its hanging part can be inserted into the limiting channel of the fixed seat, and then laid flat and straightened (that is, the natural installation posture of the mounting plate of the hook body). In this state, the bent hook part of the hook body is buckled at the corresponding edge of the limiting channel of the fixed seat, thereby limiting the hanging part from withdrawing from the limiting channel, thereby achieving the purpose of effectively preventing it from falling off. Similarly, after releasing the fixed connection between the hook body and the component to be installed, the hook body can be tilted at a certain angle to be removed from the limiting channel of the fixed seat. The above-mentioned hook assembly is easy to disassemble and assemble, and is easy to operate, thereby improving the installation efficiency.

[0175] Generally speaking, the number of limiting channels on the fixing seat can be set to one or more, and the limiting channel itself can also be a closed channel structure (the cross section is closed in the circumferential direction). However, in order to facilitate the installation of the fixing seat and the hook body, the left and right sides of the fixing seat are defined by limiting channels that pass through the front and back and are open on the sides. The hook body has two hanging parts that are opposite to each other on the left and right and spaced a certain distance apart. The two hanging parts of the hook body can respectively extend into the two limiting channels of the fixing seat, and the bent hook parts of the two hanging parts are buckled at the upper edge of the rear end of the corresponding limiting channel.

[0176] In order to achieve secure limiting of the hook body and the fixing seat in the front-to-back direction, when the hanging portion of the hook body is installed in place on the fixing seat, the mounting plate of the hook body or the portion of the hanging portion adjacent to the mounting plate abuts against the front of the fixing seat.

[0177] In order to increase the overall strength of the hook body, a reinforcing rib is provided at the position where the hanging portion is connected to the mounting plate. When the hanging portion of the hook body is installed in place on the fixing seat, the reinforcing rib of the hook body abuts against the front of the fixing seat.

[0178] In order to further ensure the reliability of the hook assembly after installation, the hanging part of the hook body includes a horizontally arranged extension wall and a vertically arranged support plate connected to the extension wall. When the hanging part of the hook body is installed in place on the fixing seat, the extension wall of the hanging part extends into the limiting channel of the fixing seat, and the support plate is correspondingly abutted against the side opening of the limiting channel. The above-mentioned support plate also abuts against the fixing seat at the side to ensure the reliability of the installation of both.

[0179] In order to form the above-mentioned limiting channel, the left and right sides of the fixing seat are provided with a first stop edge and a second stop edge extending frontward and rearward and opposite to each other in the up and down directions, and the gap between the first stop edge and the second stop edge is the above-mentioned limiting channel.

[0180] In order to adapt to the hook portion of the hook body, the extension length of the first stop edge located above in the front-to-back direction is smaller than the extension length of the second stop edge located below in the front-to-back direction, and the hook portion of the hook body extends into the limiting channel of the fixed seat and then buckles the rear end of the first stop edge.

[0181] The technical solution adopted by the present invention to solve the above-mentioned thirteenth technical problem is as follows: the hanging portion of the hook body includes a base body with a metal skeleton as the main body and a first vibration-damping layer coated outside the base body.

[0182] The arrangement of the first vibration-damping layer on the hanging portion of the hook body has a good vibration-damping effect and reduces the transmission to the machine body.

[0183] As an improvement, the first vibration-damping layer is a rubber member.

[0184] The machine body also includes an air inlet cavity connected to the second shell in a manner that it can move up and down relative to the second shell, the driving device includes a driving member and a transmission assembly, the driving member is arranged on the first shell, and the transmission assembly has a power input end for transmission connection with the driving member, a first power output end for connecting with the second shell to drive the second shell to move up and down relative to the first shell, and a second power output end for connecting with the air inlet cavity to drive the air inlet cavity to move up and down relative to the second shell;

[0185] The first power output end of the transmission assembly is connected to the second housing via the hook assembly.

[0186] In order to facilitate the disassembly and assembly between the transmission assembly and the second housing, the fixing seat is arranged on the first power output end of the transmission assembly, and the mounting plate of the hook body is connected to the second housing.

[0187] Generally speaking, the transmission assembly of the driving device can adopt various existing technologies such as a screw transmission assembly, a gear transmission assembly, a connecting rod transmission assembly, etc. In order to simplify the structure of the transmission assembly, make it more compact and further reduce the internal space occupied by the range hood, the transmission assembly includes:

[0188] a fixed arm defining a receiving chamber therein;

[0189] A first screw rod is transmission-connected to the power output end of the driving member and rotates around its own axis under the drive of the driving member. The first screw rod is threadedly connected to the fixed arm, so that when rotating around its own axis, it can drive the fixed arm to move linearly relative to the first screw rod;

[0190] A second screw rod is rotatably disposed in the accommodation chamber of the fixed arm, the second screw rod is axially hollow to form a mounting channel for the first screw rod to extend therein, the second screw rod can coaxially rotate with the first screw rod, and is displaced in the axial direction relative to the first screw rod;

[0191] A movable arm, connected in the accommodating chamber of the installation chamber and threadedly connected to the second screw rod, so as to slide linearly relative to the fixed arm under the drive of the second screw rod;

[0192] The first screw rod constitutes the power input end of the transmission assembly, the fixed arm is connected to the second shell to constitute the first power output end of the transmission assembly, and the movable arm is connected to the air inlet cavity to constitute the second power output end of the transmission assembly.

[0193] In order to ensure the reliability of the connection between the fixing seat and the fixing arm, the fixing arm is a sleeve member, the fixing seat is arranged at the end of the fixing arm, and defines a through hole for the first screw rod to pass through.

[0194] In order to reduce the transmission of vibration of the driving device to the air inlet cavity at the second power output end of the driving device, the second power output end of the driving device is connected to the air inlet cavity via a buffering and vibration reduction structure.

[0195] In order to simplify the buffering and vibration reduction structure, a connector with a socket is provided on the second power output end of the driving device, and the connector is coated with a second vibration reduction layer, and a connecting frame for connecting with the connector is provided on the air inlet cavity;

[0196] The above-mentioned connecting head, the second vibration reduction layer and the connecting frame together constitute the buffer vibration reduction structure.

[0197] Taking into account the relatively large stroke of the driving device (specifically the transmission component), the swing of the screw is a factor that cannot be ignored. Tests show that under the existing screw processing straightness level, the swing amplitude of the screw end with a stroke of 240mm can reach 1mm. In order to better suppress the swing problem of the screw and to better connect it with the driving member transmission, one end of the first screw adjacent to the driving member extends to the position of the top plate of the first shell, and is connected to the top plate of the first shell through a mounting seat, and a vibration-damping pad for vibration isolation is provided between the mounting seat and the first shell.

[0198] Generally speaking, the output shaft of the driving motor as a driving member can be directly connected to the screw, but this will transmit the vibration generated by the driving motor to the screw of the transmission assembly. In order to avoid the above problems, the driving member is a driving motor arranged on the top plate of the first housing, and the output shaft of the driving motor is connected to the first screw through a worm gear transmission mechanism. The above structural design can effectively block the transmission of vibration, eliminate process deviations, transmit power through the worm gear (plastic parts can be used) and the hexagonal hole of the metal first screw, avoid the rigid connection of the screw, and the positioning interference of the worm gear, and effectively reduce the vibration transmission and abnormal noise of the motor.

[0199] In order to prevent the vibration generated by the driving motor from being directly transmitted to the first shell, the driving member is a driving motor arranged on the top plate of the first shell, and the driving motor is installed on the first shell through a vibration damping seat.

[0200] As an improvement, the vibration damping seat is a rubber sleeve sleeved around the periphery of the main body of the driving motor.

[0201] In order to improve the vibration reduction effect, the area on the rubber sleeve that contacts the first shell is set as a grid-like structure.

[0202] The fourteenth technical problem to be solved by the present invention is to provide a range hood that can effectively improve the smoke extraction effect and reduce the escape of oil smoke in view of the current status of the prior art.

[0203] The technical solution adopted by the present invention to solve the above fourteenth technical problem is: a range hood, comprising:

[0204] An air inlet cavity defines an air inlet chamber inside, and an air inlet port is provided on the front side wall of the air inlet cavity;

[0205] A casing is disposed above the air inlet cavity and is in fluid communication with the air inlet chamber, wherein a smoke shielding portion for collecting smoke is formed in an area on the bottom wall of the casing located in front of the air inlet cavity;

[0206] The height position of the upper edge of the air inlet on the air inlet cavity is lower than the height position of the smoke shield of the casing, and also includes a guide plate extending obliquely upward from the lower edge of the air inlet of the air inlet cavity toward the air inlet cavity, and the distance between the upper edge of the air inlet and the guide plate is recorded as d, wherein the value range of d is: 30mm-300mm.

[0207] The above-mentioned “distance d between the upper edge of the air inlet and the guide plate” can be understood as the shortest distance between the upper edge of the air inlet and the guide plate.

[0208] Since the height of the upper edge of the air inlet on the air inlet cavity is lower than the height of the smoke shield of the casing, and the distance between the upper edge of the air inlet and the inclined guide plate is set within the range of 30mm-300mm, the air inlet of the air inlet cavity is lowered as close to the smoke source as possible, thereby ensuring the effective ventilation area at the air inlet of the air inlet cavity, so that the rising oil smoke can enter the smoke inlet chamber more smoothly, reducing the escape of oil smoke and improving the oil smoke absorption effect. On the other hand, the above structural design also reduces the height of the air inlet, so that the oil smoke is sucked in when it is still a certain distance from the bottom of the casing, reducing the condensed oil generated by the bottom of the casing due to contact with the oil smoke, and improving the user experience.

[0209] When the power of the fan system is stable, the larger the effective ventilation area at the air inlet, the smaller the flow rate; the smaller the effective ventilation area, the greater the flow rate. In order to suck all the fumes generated during the cooking process into the smoke inlet chamber, it is necessary to ensure that the effective ventilation area of ​​the air inlet is not too small, otherwise the range hood will not have time to suck all the fumes into it during the time it takes to rise. The effective ventilation area of ​​the air inlet cannot be too large. When the area is too large, the inlet flow rate becomes smaller, the suction force is too small, and there is not enough attraction to suck the generated fumes into the range hood. In order to better balance the above two situations, when the length dimension of the air inlet of the range hood (that is, the dimension in the left and right direction) is constant, the distance d between the upper edge of the air inlet and the guide plate is an important factor affecting the effective ventilation area of ​​the air inlet. For this reason, the d value is further reasonably designed. Specifically, the value range of d is preferably: 70mm-200mm.

[0210] In order to make the air inlet as low as possible and close to the smoke source, ensure that the effective ventilation area of ​​the air inlet is within a suitable design range, and thus ensure the oil fume absorption effect, the vertical distance between the upper edge of the air inlet and the smoke barrier of the casing is recorded as X, where the value range of X is: 5mm-50mm.

[0211] In order to achieve a better guiding effect at the air inlet, the angle formed between the guide plate and the horizontal plane is recorded as α, where the value range of α is: 15°≤α<90°. The above-mentioned inclined arrangement of the guide plate enables the guide plate to have a certain shielding effect on the front, which can ensure the aesthetics of the air inlet, and the appearance of the guide plate is relatively smooth without extra protruding features, which ensures the easy cleanliness of the air inlet.

[0212] In order to achieve installation and fixation with the air inlet cavity, the lower edge of the guide plate has a first flange extending backwards and used to be connected to the air inlet cavity.

[0213] In order to achieve the purpose of smoothly guiding the oil on the air inlet chamber, an oil cup is also provided at the bottom of the main body of the air inlet cavity, and the first flange of the guide plate is connected to the bottom wall of the main body of the air inlet cavity. An oil leakage hole for oil to flow downward into the oil cup is opened on the bottom wall of the main body of the air inlet cavity corresponding to the area located in front of the guide plate.

[0214] In order to ensure the oil guiding effect, the oil leakage holes have at least two arranged in sequence along the left-right direction.

[0215] As another feasible improvement scheme, the guide plate and the main body of the air inlet cavity are designed as one body. For example, the guide plate can also be extended as a part of the main body of the air inlet cavity, and corresponding flanges are added on the left and right sides of the guide plate to be fixed to the air inlet cavity.

[0216] In order to prevent the guide plate from shaking under the influence of airflow, a shelf for the upper edge of the guide plate to rest on is provided on the rear side wall of the air inlet cavity opposite to the air inlet.

[0217] In order to facilitate the disassembly of the guide plate, the upper edge portion of the guide plate is connected to the shelf in a mutually clamped manner.

[0218] In order to further improve the convenience of disassembly and assembly of the guide plate, the rear side wall of the air inlet cavity is provided with at least two shelves arranged in sequence along the left and right directions, each of the shelves has a slot with a top opening, and the upper edge of the guide plate also has a folded edge that folds and extends toward the rear and lower side, and the folded edge is inserted into the slot of each shelf.

[0219] In order to ensure the overall strength of the air inlet cavity, the air inlet cavity includes a first side wall and a second side wall that are opposite to each other in the left-right direction, and a support plate connected between the front edge of the first side wall and the front edge of the second side wall, and the lower edge of the support plate is the upper edge of the air inlet of the air inlet cavity. The design of the support plate ensures the structural strength of the entire air inlet area. In the absence of the support plate, the air inlet box is a structure with an open front face, and the structural strength of the entire air inlet box is far from enough. After adding the support plate, the air inlet box is surrounded by a structure with four closed end faces, and the structural strength is greatly improved.

[0220] In order to prevent the oil from flowing directly down from the upper edge of the air inlet, the inner side of the lower edge of the support plate is also provided with an oil guide groove for guiding the oil to the left and right sides. The oil gathered on the air inlet cavity will fall along the wall to the oil guide groove of the support plate, and drip into the oil cup from the left and right sides of the support plate.

[0221] In order to form the above-mentioned oil guide groove, simplify the structure of the air inlet cavity and reduce costs, the lower edge of the support plate has a second flange that is folded toward the air inlet cavity and extends upward, and the oil guide groove is defined between the second flange and the corresponding part of the main body of the support plate.

[0222] In order to make the volume of the range hood smaller and more compact when not in use so that it can be better hidden in a kitchen cabinet, the air inlet cavity is connected to the casing in a manner that it can be raised and lowered relative to the casing, and has a closed state in which it moves upward into the casing and closes the air inlet, and an open state in which it moves downward to expose the casing and open the air inlet.

[0223] In order to further ensure the aesthetics of the range hood when not in use, when the air inlet cavity is in a closed state, the bottom wall of the air inlet cavity is substantially flush with the bottom wall of the casing.

[0224] The housing includes a first shell and a second shell connected together in a manner that they can be lifted and lowered relative to each other, the inner cavity of the first shell is in fluid communication with the inner cavity of the second shell, and the air inlet cavity is connected to the second shell in a manner that it can be lifted and lowered relative to the second shell. The above structural design enables the range hood to form a two-stage telescopic lifting structure as a whole. When rising, the second shell and the air inlet cavity can rise to the designated position at the same time, achieving the effect of being flush with the cabinet. When descending, the large stroke of the two-stage drive allows the air inlet of the air inlet cavity to be lowered further, thereby improving the range hood absorbing effect.

[0225] The fan system of the range hood can be arranged inside the casing or outside the casing (such as an external fan arranged at the kitchen ceiling). Preferably, it also includes a fan system, and the fan system is arranged in the first shell. Generally, the first shell can be fixed on the wall of the kitchen as a fan rack, and the fan system is fixed relative to the first shell, so that the weight of the second shell is reduced, and the lifting process of the second shell is more stable and operable.

[0226] The fifteenth technical problem to be solved by the present invention is to provide a range hood to improve the reliability of the oil circuit of the whole machine and the structural strength of the cabinet in view of the deficiencies in the above-mentioned prior art.

[0227] The technical solution adopted by the present invention to solve the fifteenth technical problem is: a range hood, comprising an upper box, a lower box and an air inlet body, wherein the lower box and the air inlet body can be lifted and lowered relative to the upper box; the lower box comprises a first front plate and a back plate arranged in a front-to-back interval; the characteristics are:

[0228] The width of the lower box in the left-right direction is greater than the width of the upper box;

[0229] The lower box body also includes two connecting plates connected between the first front plate and the back plate, and the back plate, the connecting plates and the first front plate are covered on the outer periphery of the upper box body.

[0230] By setting a connecting plate between the front and rear sides of the lower box, and allowing the connecting plate and the front and rear sides of the lower box to cover the outer periphery of the upper box, it has good sealing performance and ensures the reliability of the oil circuit of the whole machine, that is, it not only seals the space inside the lower box when the lower box is lifted, but also guides the oil in the upper box to flow downward when the range hood is working; because the lower box covers the upper box, the left and right dimensions of the lower box and the air inlet body can be designed to match the household stove, expand the coverage of the negative pressure area, and reduce the escape of oil smoke from the left and right sides; in addition, because the distance between the front and rear sides of the lower box is adapted to the upper box, the distance is large, and the overall structural strength of the lower box can be strengthened by setting the connecting plate. In addition, the connecting plate can also be used as a carrier for installing other components of the lower box to achieve the combined installation of multiple components.

[0231] Furthermore, a first oil fume channel and a second oil fume channel are formed in the lower box body, the first oil fume channel is located below the connecting plate and corresponds to the air inlet body, the second oil fume channel is surrounded by the back plate, the connecting plate and the first front plate, the front end of the second oil fume channel exceeds the front end of the first oil fume channel, and the left and right side ends of the first oil fume channel exceed the left and right side ends of the second oil fume channel;

[0232] The connecting plate is provided with auxiliary air inlets for the oil smoke from the first oil smoke channel located on the left and right sides of the second oil smoke channel to pass through and enter the second oil smoke channel. Thus, by setting the auxiliary air inlets, the structural strength of the connecting plate itself is ensured, and the entire air inlet body of the whole machine can effectively absorb the oil smoke in the working state, thereby improving the overall oil smoke absorption effect.

[0233] Furthermore, the lower box body further comprises a support plate, the support plate extending from a position away from the connecting plate to the connecting plate, the support plate being connected to a position of the connecting plate located at an upper edge of the auxiliary air inlet, thereby the support plate can guide the oil smoke from the first oil smoke channel into the auxiliary air inlet.

[0234] Furthermore, in order to make the lower box body adapt to the air inlet body and the upper box body respectively, a first oil fume channel and a second oil fume channel are formed in the lower box body. The first oil fume channel is located under the connecting plate and corresponds to the air inlet body, and the second oil fume channel is surrounded by the back plate, the connecting plate and the first front plate and corresponds to the upper box body.

[0235] Furthermore, in order to facilitate the formation of the first oil fume channel and the second oil fume channel, the lower box body further includes:

[0236] The first side panels have two portions, and are respectively extended backward from the left end portion and the right end portion of the first front panel, and the connecting plate is arranged on a side of the first side panel facing the lower box body;

[0237] There are two second front panels, each of which corresponds to a first side panel, and the second front panel is connected to the rear end of the corresponding first side panel and extends in a direction away from the other first side panel;

[0238] The second side panels have two parts, and are respectively connected between the left end of the back panel and the left end of the second front panel on the left side, and between the right end of the back panel and the right end of the second front panel on the right side; and

[0239] The partition is arranged between the two second front plates, and the partition is located below the connecting plate.

[0240] Furthermore, to facilitate the connection between the connecting plate and the front and rear sides, a first mounting interface is provided at the edge of the connecting plate, the back plate is fixed to the first mounting interface at the rear end of the connecting plate, and the first front plate is fixed to the first mounting interface at the front end of the connecting plate.

[0241] Furthermore, the edge of the connecting plate is provided with a first mounting interface, the edge of the first side plate is provided with a second mounting interface, and the second mounting interface at the top of the first side plate is fixed to the first mounting interface at the top of the connecting plate. Thus, the connecting plate can be used as a carrier to fix the first side plate.

[0242] Furthermore, the second front panel is fixed to the second mounting interface at the rear end of the first side panel, so that the first side panel can be used as a carrier to fix the second front panel.

[0243] Furthermore, a smoke baffle is provided at the bottom of the lower box body, and the smoke baffle is fixed to the second mounting interface at the bottom of the first side plate, so that the smoke baffle can be fixed by using the first side plate as a carrier.

[0244] Furthermore, the front side of the first front plate is covered with a panel, thereby preventing fasteners and the like used for installation from being exposed and facilitating the setting of control switches and the like.

[0245] Furthermore, to facilitate the installation of the panel, a second mounting interface is provided at the edge of the first side panel, a panel bracket is provided on the rear side of the panel, the second mounting interface at the front end of the first side panel is a bent mounting edge, the mounting edge is located on the front side of the first front panel, a slot is provided on the mounting edge, and a hook is provided on the panel bracket, and the first side panel and the panel bracket are limited by the hook passing through the slot.

[0246] Preferably, the air inlet body is sleeved in the lower box body. In a non-working state, the upper box body and the air inlet body are partially or completely retracted in the lower box body. In a working state, the lower box body descends relative to the upper box body, and the air inlet body descends relative to the lower box body.

[0247] Furthermore, the air inlet body includes a main air inlet opened on the front side, and a smoke baffle is provided at the bottom of the lower box body, which can guide the oil smoke into the main air inlet to improve the smoke collection effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0248] Figure 1 This is a schematic diagram of the structure of the range hood according to the first embodiment of the present invention (when the lower box body is raised);

[0249] Figure 2 for Figure 1 The schematic diagram of the internal structure of the range hood shown;

[0250] Figure 3 for Figure 1 A structural cross-sectional view of the range hood shown;

[0251] Figure 4 for Figure 1 A magnified schematic diagram of part A;

[0252] Figure 5 This is a schematic structural diagram of an upper front plate of a range hood according to Embodiment 1 of the present invention;

[0253] Figure 6 This is a schematic structural diagram of a grid plate according to Embodiment 1 of the present invention;

[0254] Figure 7 This is a structural schematic diagram of the range hood according to the first embodiment of the present invention (when the lower box body is in a descending state);

[0255] Figure 8 for Figure 7 A schematic diagram of the internal structure of the range hood;

[0256] Fig. 9 for Figure 7 A structural cross-sectional view of the range hood shown;

[0257] Figure 9-1 for Fig. 9 A magnified schematic diagram of part B;

[0258] Fig.10 This is a schematic structural diagram of a range hood according to Embodiment 1 of the present invention;

[0259] Fig.11 This is a structural schematic diagram of a range hood according to a second embodiment of the present invention (the lower housing is raised);

[0260] Fig.12for Fig.11 The schematic diagram of the internal structure of the range hood shown;

[0261] Fig.13 for Fig.11 A structural cross-sectional view of the range hood shown;

[0262] Fig.14 for Fig.11 A magnified schematic diagram of part A;

[0263] Fig.15 This is a structural schematic diagram of an upper front plate of a range hood according to a second embodiment of the present invention;

[0264] Fig.16 This is a schematic structural diagram of a grid plate according to a second embodiment of the present invention;

[0265] Fig.17 This is a structural schematic diagram of a range hood according to a second embodiment of the present invention (the lower housing is in a descending state);

[0266] Fig.18 for Fig.17 A schematic diagram of the internal structure of the range hood;

[0267] Fig.19 for Fig.17 A structural cross-sectional view of the range hood shown;

[0268] Fig. 20 for Fig.19 A magnified schematic diagram of part B;

[0269] Fig.21 This is a structural schematic diagram of a range hood according to Embodiment 3 of the present invention (lower box body raised);

[0270] Fig. 22 for Fig.21 A structural cross-sectional view of the range hood shown;

[0271] Fig.23 This is a schematic structural diagram of an oil guide plate according to Embodiment 3 of the present invention;

[0272] Fig.24 This is a schematic structural diagram of an oil filter plate according to Embodiment 3 of the present invention;

[0273] Fig.25 This is a structural schematic diagram of a range hood according to Embodiment 3 of the present invention (lower housing in descending state);

[0274] Fig.26 for Fig.25 A schematic diagram of the internal structure of the range hood;

[0275] Fig. 27 for Fig.25Another schematic diagram of the internal structure of the range hood;

[0276] Fig.28 for Fig.25 A structural cross-sectional view of the range hood shown;

[0277] Fig.29 This is a schematic diagram of the structure of the range hood according to the fourth embodiment of the present invention (the lower box body is raised);

[0278] Fig.30 for Fig.29 The schematic diagram of the internal structure of the range hood shown;

[0279] Fig.31 for Fig.29 A structural cross-sectional view of the range hood shown;

[0280] Fig.32 for Fig.29 A magnified schematic diagram of part A;

[0281] Fig.33 This is a schematic structural diagram of an air inlet body and an oil cup according to a fourth embodiment of the present invention;

[0282] Fig.34 This is a structural schematic diagram of a range hood according to a fourth embodiment of the present invention (the lower housing is in a descending state);

[0283] Fig.35 for Fig.33 A structural cross-sectional view of the range hood shown;

[0284] Fig.36 This is a structural schematic diagram of a range hood according to a fifth embodiment of the present invention (the lower box body is raised);

[0285] Fig.37 for Fig.36 A structural cross-sectional view of the range hood shown;

[0286] Fig.38 for Fig.36 The schematic diagram of the internal structure of the range hood shown;

[0287] Fig.39 This is a schematic structural diagram of an oil guide plate according to a fifth embodiment of the present invention;

[0288] Fig.40 This is a schematic structural diagram of an oil filter plate according to a fifth embodiment of the present invention;

[0289] Fig.41 This is a structural schematic diagram of a range hood according to a fifth embodiment of the present invention (the lower housing is in a descending state);

[0290] Fig.42 for Fig.41 A structural cross-sectional view of the range hood shown;

[0291] Fig.43 for Fig.41 The schematic diagram of the internal structure of the range hood shown;

[0292] Fig.44 This is a structural schematic diagram of a range hood according to a sixth embodiment of the present invention (the lower housing and the air inlet body are raised);

[0293] Fig.45 for Fig.44 A structural cross-sectional view of the range hood shown;

[0294] Fig.46 for Fig.44 The schematic diagram of the internal structure of the range hood shown;

[0295] Fig.47 This is a schematic structural diagram of a first oil guide member according to a sixth embodiment of the present invention;

[0296] Fig.48 This is a schematic structural diagram of a second oil guide member according to a sixth embodiment of the present invention;

[0297] Fig.49 This is a structural schematic diagram of a range hood according to a sixth embodiment of the present invention (the lower housing and the air inlet body are in a descending state);

[0298] Fig.50 for Fig.49 The schematic diagram of the internal structure of the range hood shown;

[0299] Fig.51 for Fig.50 A structural cross-sectional view of the range hood shown;

[0300] Fig.52 This is a structural schematic diagram of a range hood according to Embodiment 7 of the present invention (the lower housing and the air inlet body are raised);

[0301] Fig.53 for Fig.52 The schematic diagram of the internal structure of the range hood shown;

[0302] Fig.54 for Fig.52 A structural cross-sectional view of the range hood shown;

[0303] Fig.55 for Fig.52 A magnified schematic diagram of part A;

[0304] Fig.56 This is a schematic structural diagram of an air inlet body and an oil cup according to a seventh embodiment of the present invention;

[0305] Fig.57 This is a schematic diagram of the structure of the range hood according to the seventh embodiment of the present invention (the lower housing and the air inlet body are in a descending state);

[0306] Fig.58 for Fig.56 A structural cross-sectional view of the range hood shown;

[0307] Fig.59 for Fig.58 A magnified schematic diagram of part B;

[0308] Fig.60 This is a structural schematic diagram of a range hood according to Embodiment 8 of the present invention (in a non-working state);

[0309] Fig.61 for Fig.60 The schematic diagram of the internal structure of the range hood shown;

[0310] Fig.62 This is a structural schematic diagram of a range hood according to an eighth embodiment of the present invention (in working state);

[0311] Fig.63 for Fig.62 The schematic diagram of the structure of the range hood shown is a schematic diagram of the structure of the range hood after removing the lower cabinet back plate and other components;

[0312] Fig.64 for Fig.62 A structural cross-sectional view of the range hood shown;

[0313] Fig.65 for Fig.64 The enlarged schematic diagram of the D part;

[0314] Fig.66 for Fig.64 The enlarged schematic diagram of part E in the middle;

[0315] Fig.67 Schematic diagram of the structure of the oil guide side plate of the eighth embodiment of the present invention;

[0316] Fig.68 is a schematic diagram of the three-dimensional structure of the range hood according to the ninth embodiment of the present invention (in a folded state);

[0317] Fig.69 is a schematic diagram of the three-dimensional structure of the range hood according to the ninth embodiment of the present invention from another angle;

[0318] Fig.70 is a vertical cross-sectional view of the range hood according to Embodiment 9 of the present invention cut along the front-to-back direction;

[0319] Fig.71 is a schematic diagram of the three-dimensional structure of the range hood according to the ninth embodiment of the present invention (in an extended state);

[0320] Fig.72 for Fig.71A schematic diagram of the three-dimensional structure of the back of the range hood shown;

[0321] Fig.73 for Fig.71 A left side view of the range hood shown;

[0322] Fig.74 for Fig.71 A vertical cross-sectional view of the range hood shown along the front-rear direction;

[0323] Fig.75 Schematic diagram of the three-dimensional structure of the lifting device of Embodiment 9 of the present invention (in the extended state);

[0324] Fig.76 for Fig.75 A cross-sectional view of the lifting device shown along its length direction;

[0325] Fig.77 Schematic diagram of the three-dimensional structure of the lifting device of Embodiment 9 of the present invention (in a folded state);

[0326] Fig.78 for Fig.77 A cross-sectional view of the lifting device shown along its length direction;

[0327] Fig.79 for Fig.77 A partially cutaway perspective view of the lifting device shown;

[0328] Fig.80 for Fig.72 The three-dimensional structural schematic diagram of the range hood shown in omitting some components of the first housing, some components of the second housing, etc.;

[0329] Fig.81 is a schematic diagram of the three-dimensional structure of the range hood according to the tenth embodiment of the present invention (in a folded state);

[0330] Fig.82 is a schematic diagram of the three-dimensional structure of the range hood according to the tenth embodiment of the present invention from another angle;

[0331] Fig.83 A vertical cross-sectional view of the range hood according to Embodiment 10 of the present invention cut along the front-to-back direction;

[0332] Fig.84 is a schematic diagram of the three-dimensional structure of the range hood according to the tenth embodiment of the present invention (in an extended state);

[0333] Fig.85 for Fig.84 A schematic diagram of the three-dimensional structure of the back of the range hood shown;

[0334] Fig.86 for Fig.84A left side view of the range hood shown;

[0335] Fig.87 for Fig.84 A vertical cross-sectional view of the range hood shown along the front-rear direction;

[0336] Fig.88 Schematic diagram of the three-dimensional structure of the driving device of the tenth embodiment of the present invention (in the extended state);

[0337] Fig.89 for Fig.88 A cross-sectional view of the drive device shown along its length direction;

[0338] Fig.90 Schematic diagram of the three-dimensional structure of the driving device of the tenth embodiment of the present invention (in the folded state);

[0339] Fig.91 for Fig.90 A cross-sectional view of the drive device shown along its length direction;

[0340] Fig.92 for Fig.90 A partially cutaway perspective view of the drive device shown;

[0341] Fig.93 for Fig.85 The three-dimensional structural schematic diagram of the range hood shown in omitting some components of the first housing, some components of the second housing, etc.;

[0342] Fig.94 It is a three-dimensional structural schematic diagram of the hook assembly part of the driving device of the tenth embodiment of the present invention (the hook body is in a disassembled state);

[0343] Fig.95 It is a three-dimensional structural schematic diagram of the hook assembly part of the driving device of the tenth embodiment of the present invention (the hook body is omitted);

[0344] Fig.96 It is a cross-sectional view of the hook assembly part of the driving device of the tenth embodiment of the present invention (the hook body is in a state to be assembled);

[0345] Fig.97 It is a cross-sectional view of the hook assembly portion of the driving device of the tenth embodiment of the present invention (the hook body is in the assembled state);

[0346] Fig.98 This is a schematic diagram of the three-dimensional structure of the hook body of the driving device of the tenth embodiment of the present invention (the first vibration-damping layer is omitted);

[0347] Fig.99 is a schematic diagram of the three-dimensional structure of the range hood according to the eleventh embodiment of the present invention (in a folded state);

[0348] Fig.100 is a schematic diagram of the three-dimensional structure of the range hood according to the eleventh embodiment of the present invention from another angle;

[0349] Fig.101 A vertical cross-sectional view of the range hood according to the eleventh embodiment of the present invention cut along the front-to-back direction;

[0350] Fig.102 is a schematic diagram of the three-dimensional structure of the range hood according to the eleventh embodiment of the present invention (in an extended state);

[0351] Fig.103 for Fig.102 A vertical cross-sectional view of the range hood shown along the front-rear direction;

[0352] Fig.104 for Fig.103 An enlarged view of a portion of the cross-sectional view shown in ;

[0353] Fig.105 Schematic diagram of the three-dimensional structure of the air inlet cavity;

[0354] Fig.106 A vertical sectional stereoscopic view of the air inlet cavity cut along the front-to-back direction;

[0355] Fig.107 This is a schematic diagram of the working state of the range hood according to the twelfth embodiment of the present invention;

[0356] Fig.108 This is a schematic diagram of the working state of the hidden part of the lower box of the range hood according to the twelfth embodiment of the present invention;

[0357] Fig.109 for Fig.107 A cross-sectional view of a range hood (left-right cross-section);

[0358] Fig.110 for Fig.107 A cross-sectional view (front-rear cross-section) of a range hood;

[0359] Fig.111 This is a schematic diagram of the exploded structure of a range hood according to a twelfth embodiment of the present invention;

[0360] Fig.112 It is a cross-sectional view of the lower box body and the smoke baffle of the range hood according to the twelfth embodiment of the present invention (horizontal cross-section, the lower box body hides the panel);

[0361] Fig.113 It is a partial structural schematic diagram of the lower box body of the range hood according to the twelfth embodiment of the present invention;

[0362] Fig.114 for Fig.113 Schematic diagram of the decomposition structure;

[0363] Fig.115 This is a schematic diagram of a non-operating state of a range hood according to a twelfth embodiment of the present invention;

[0364] Fig.116 This is a schematic diagram of a non-working state of a hidden portion of the lower box of a range hood according to a twelfth embodiment of the present invention. DETAILED DESCRIPTION

[0365] The present invention is further described in detail below with reference to the accompanying drawings.

[0366] Embodiment 1:

[0367] like Figures 1 to 4 As shown, the lifting type range hood of this embodiment comprises an upper box body 1, a lower box body 2 and an air inlet body 3. A fan 5 is installed in the upper box body 1, and the lower box body 2 is arranged on the upper box body 1 and can move up and down relative to the upper box body 1, and the lower box body 2 is wrapped around the outer surface of the upper box body 1. Figure 3 The direction indicated by the middle arrow C is backward, and the air inlet body 3 is arranged at the rear of the lower box body 2 and can move up and down relative to the lower box body 2. The lower box body 2 and the air inlet body 3 can move synchronously under the drive of a set of driving mechanisms, or they can move separately under the drive of independent driving mechanisms.

[0368] Combination Figure 5 As shown, there is a first oil guide member 6 inside the lower box body 2, and the first oil guide member 6 is a plate-shaped structure as a whole. The projection of the front side surface of the upper box body 1 in the vertical direction falls on the first oil guide member 6. Therefore, the range hood adopts a structure in which the lower box body wraps the upper box body, and the oil on the upper box body 1 can flow smoothly into the first oil guide member 6.

[0369] The first oil guide member 6 can adopt a variety of different structures, for example, it can be an overall plate-shaped structure, in which case, the first oil guide member 6 has a first side, a second side and a third side, and the left and right sides of the lower box body 2 respectively have a left mounting plate 11 and a right mounting plate 12, the first side is directly or indirectly connected to the left mounting plate 11, the second side 12 is directly or indirectly connected to the right mounting plate, and the third side is directly or indirectly connected to the front side panel of the lower box body 2, thereby, the left and right mounting plates 11, the right mounting plate 12, the first oil guide member 6 and the front panel of the lower box body 2 form an air inlet cavity 13 in the lower box body 2. As a result, the air inlet cavity 13 forms a three-sided sealed structure, which effectively avoids the airflow entering the air inlet cavity 13 from causing pressure relief, thereby affecting the oil fume absorbing effect.

[0370] like Fig.10As shown, the first oil guide member 6 of the present embodiment is an L-shaped plate structure, that is, it includes a vertical plate body and a horizontal plate body extending from the lower edge of the vertical plate body from front to rear, and the left and right sides of the horizontal plate body respectively form a left side edge 64 and a right side edge 65, the left side edge 64 is directly or indirectly connected to the left mounting plate 11, and the right side edge 65 is directly or indirectly connected to the right mounting plate 12, and the vertical plate body of the first oil guide member 6 is fixed on the front side panel 21 and / or the lower box top plate 22, so that the left mounting plate 81, the right mounting plate 82, and the first oil guide member 6 form an air inlet cavity 13 in the lower box 2.

[0371] In this embodiment, the first oil guide member 6 is tilted downward from front to back, and the value range of the tilt angle α relative to the horizontal plane is 0°<α≤10°. The rear edge of the first oil guide member 6 has an oil guide fold 62 extending backward and downward, and the projection of the rear edge of the oil guide fold 62 in the vertical direction falls into the oil cup 4. The oil guide fold 62 has oil leakage notches 63 distributed at intervals. The purpose of providing the oil leakage notches 63 is to prevent the oil from flowing along the edge when the range hood is suspended and tilted left and right.

[0372] In this embodiment, a concave oil collecting groove 61 is formed in the middle of the first oil guide member 6, and the bottom surface of the oil collecting groove 61 is inclined relative to the first oil guide member 6. A fan 5 is installed in the upper box body 1, and the fan 5 is located above the first oil guide member 6. When the lower box body 2 rises to the highest point along the upper box body 1, the bottom of the fan 5 is placed in the oil collecting groove 61. On the one hand, the oil collecting groove 61 can avoid the interference with the fan 5 after the whole machine is folded, reduce the height of the whole machine, improve the installation adaptability, convenience and save manufacturing costs; on the other hand, the oil collecting groove 61 guides the oil of the fan 5 downward in an orderly manner, avoids the disorderly guidance of the main oil in the range hood, and improves the cleanliness and oil discharge efficiency inside the whole machine.

[0373] The air inlet body 3 of this embodiment has a second oil guide member, an oil cup 4 is installed at the bottom of the air inlet body 3, the first oil guide member 6 cooperates with the second oil guide member, and the oil inside the upper box body 1 and the fan 5 enters the oil cup 4 through the first oil guide member 6 and the second oil guide member.

[0374] like Figure 6As shown, the second oil guide member of this embodiment is a grille plate 7, which is tilted downward from front to back. The front oil guide surface 70 of the grille plate 7 and the rear edge of the oil guide fold 62 of the first oil guide member 6 are projected on the oil guide surface 70 in the vertical direction. The main body of the grille plate 7 is provided with oil guide channels 73 arranged at intervals, and the oil falling on the oil guide surface 70 flows into the oil guide channel 73. An oil leakage hole 74 is opened at the lowest position of the rear of the grille plate 7, and the projection of the oil leakage hole 74 in the vertical direction falls into the oil cup 4. In addition, in this embodiment, oil leakage holes 74 are opened at the left and right of the lowest point of each oil guide channel 73, thereby improving the oil guide efficiency and reducing the risk of accumulated oil overflow. Since the grille plate 7 extends obliquely downward from front to back, the oil is guided to the rear of the air inlet body 3 and then drips, reducing the user's visibility of the oil. In addition, the two sides of the oil guide channel 73 have upwardly bent upper flanges 731, which gather the oil to prevent the oil from flowing disorderly on the one hand, and improve the structural strength on the other hand. Considering the ventilation area and the oil extraction efficiency, the width of the oil guide channel 73 in the middle area of ​​this embodiment is greater than the width of the oil guide channel 73 in the left and right side areas of the grille plate 7, and the oil guide channel 73 in the middle area corresponds to the oil collecting groove 61 of the first oil guide member 6. In this way, the oil guide channel in the middle area can smoothly receive the oil coming out of the oil collecting groove, making the oil guide smoother. In addition, in order to avoid the oil collecting groove 61 of the first oil guide member 6, the front side of the grille plate 7 has an upwardly bent flange 71, and the middle position of the flange 71 is provided with a clearance gap 72 for avoiding the oil collecting groove 61.

[0375] A lower front plate 9 is installed on the rear side of the first oil guide 6. The lower front plate 9 is vertically arranged and the top is fixed on the rear side of the first oil guide 6. An air inlet channel connected to the air inlet cavity is formed between the lower front plate 9 and the rear plate of the lower box 2. The air inlet channel is located at the rear and lower part of the air inlet cavity. Because the front-to-back width of the air inlet channel is narrow and the oil smoke flow rate is fast, the external flow field can be driven to pull the airflow faster, giving the oil smoke a greater backward speed in the same time to prevent the oil smoke from escaping. The wide air inlet cavity is located downstream of the air inlet channel. The air inlet cavity can construct an efficient pressure stabilizing cavity, so that the airflow is buffered and stabilized in the pressure stabilizing cavity, which is beneficial to improve the oil smoke absorption effect. At the same time, the principle of resistive silencing is simulated. When the noise enters the air inlet cavity from the air inlet channel, the sound wave is reflected, thereby achieving the purpose of silencing.

[0376] Driven by the driving mechanism, the air inlet body 3 moves up and down along the lower front plate 9. The air inlet body 3 has a smoke inlet 31. An upper guide plate 10 is installed at the front bottom of the grille plate 7. The upper guide plate 10 is vertically arranged above the smoke inlet 31. The upper guide plate 10 can lower the height of the smoke inlet 31 so that the oil smoke is sucked in when it is still at a certain distance from the lower box body 2. On the one hand, it can reduce the condensed oil on the surface of the lower box body 2, and on the other hand, it can reduce the leakage of oil smoke.

[0377] The grille plate 7 of this embodiment is arranged on the rear side of the lower front plate 9, and a front sealing strip 8 is installed on the front side of the grille plate 7, and the front edge of the front sealing strip 8 is close to the rear side of the lower front plate 9. Specifically, the front sealing strip 8 is a rubber seal, and the front sealing strip 8 is clamped between the grille plate 7 and the upper guide plate 10. After the front sealing strip 8 is set, during the descent of the air inlet body 3, a certain degree of sealing structure is formed between the front sealing strip 8 and the lower front plate 9, that is, a motion seal is realized, which is a line seal here, so as to avoid leakage of oil smoke and prevent pressure relief. In order to further improve the pressure relief effect, the bottom of the lower front plate 9 has a lower folding edge 91 bent backward and downward, and a certain degree of sealing structure is also formed between the lower folding edge 91 and the upper guide plate 10, which is a line seal here. In addition, the top of the upper guide plate 10 has an upper folding edge 101 bent forward and upward, and the lower folding edge 91 and the upper folding edge 101 have opposing surfaces. Preferably, the two opposing surfaces are parallel to each other. When the air inlet body 3 is lowered to the lowest position, the opposing surfaces of the lower folding edge 91 and the upper folding edge 101 abut or approach each other to form a surface seal between the upper guide plate 10 and the lower front plate 9. At this time, Figure 9-1 As shown, the above two line seals are changed into surface seals, which have better sealing effect, can better prevent pressure release, and ensure the oil fume absorption effect. In addition, the projection of the rear edge of the lower fold 91 in the vertical direction falls into the oil cup 4, so that the oil on the lower fold 91 can smoothly enter the oil cup 4.

[0378] When the range hood is not in operation, Figures 1 to 4 As shown, the lower box body 2 rises to the highest position, the air inlet body 3 rises to the highest position synchronously and is hidden inside the lower box body 2, and the lower bottom surface of the oil cup 4 is flush with the lower bottom surface of the lower box body 2. The range hood structure is very compact and can be completely hidden in the cabinet.

[0379] When the range hood is in operation, Figure 7 to Figure 9-1 As shown, the lower box 2 is lowered to the lowest position, and the air inlet 3 is simultaneously lowered to the lowest position and extends downward from the bottom of the lower box 2, the smoke inlet 31 of the air inlet 3 is exposed, and the negative pressure area is lowered to improve the oil smoke absorption effect. In addition, under different working conditions, the lowering stroke of the lower box 2 and the air inlet 3 can be intelligently controlled.

[0380] Embodiment 2:

[0381] like Figures 11 to 14 As shown, the lifting type range hood of this embodiment comprises an upper box body 1, a lower box body 2 and an air inlet body 3. A fan 5 is installed in the upper box body 1, and the lower box body 2 is arranged on the upper box body 1 and can move up and down relative to the upper box body 1, and the lower box body 2 is wrapped around the outer surface of the upper box body 1. Fig.13The direction indicated by the middle arrow C is backward, the air inlet body 3 is arranged at the rear of the lower box body 2 and can move up and down relative to the lower box body 2, and an oil cup 4 is installed at the bottom of the air inlet body 3. The lower box body 2 and the air inlet body 3 can move synchronously under the drive of a set of driving mechanisms, or they can move separately under the drive of independent driving mechanisms.

[0382] The lower box body 2 has a first oil guide channel, the projection of the front side surface of the upper box body 1 in the vertical direction falls into the first oil guide channel, and the air inlet body 3 has a second oil guide channel connected to the oil circuit of the first oil guide channel. Thus, the oil in the upper box body 1 and the fan 5 can enter the oil cup 4 through the first oil guide channel and the second oil guide channel in turn.

[0383] like Fig.15 As shown, the first oil guide channel of this embodiment includes an upper front plate 6 with an L-shaped structure, and the upper front plate 6 is fixed inside the lower box body 2. The upper front plate 6 includes a first plate body 61 arranged vertically and a second plate body 62 bent backward from the lower edge of the first plate body 61, and the second plate body 62 is arranged obliquely downward from the front to the back, and the inclination angle of the second plate body 62 relative to the horizontal plane ranges from 0° to 10°, that is, the angle between the first plate body 61 and the second plate body 62 ranges from 90° to 100°, preferably 92°. In addition, the middle part of the second plate body 62 has a concave oil collecting groove 621, and the angle between the bottom surface of the oil collecting groove 621 and the bottom surface of the second plate body 62 outside the oil collecting groove 621 ranges from -2° to 2°. The fan 5 is located above the second plate body 2, and when the lower box body 2 rises to the highest position, the bottom of the fan 5 is placed in the oil collecting groove 621. On the one hand, the oil collecting groove 621 can avoid the interference between the whole machine and the fan 5 after the whole machine is folded, thereby reducing the height of the whole machine, improving the installation adaptability and convenience, and saving the manufacturing cost; on the other hand, the concave oil collecting groove is equivalent to the oil collecting chamber, which can discharge the oil of the fan 5 downward in an orderly manner, avoiding the disorderly discharge of the main oil in the range hood, and improving the cleanliness and oil discharge efficiency inside the whole machine.

[0384] The first plate 61 of the upper front plate 6 is close to the front wall of the lower box 2, and cooperates with the front plate of the upper box 1 to achieve a motion seal. The second plate 62 is arranged in the middle area of ​​the lower box 2 in the height direction, and the left and right sides of the second plate 62 are connected to the corresponding side mounting plates of the lower box 2. The second plate 62 is used to receive the oil falling from the inside of the upper box 2 and the fan 5. Since the second plate 62 is arranged to be inclined from front to back relative to the horizontal plane, the oil falling into the second plate 62 can be discharged backward.

[0385] like Fig.16As shown, the second oil guide channel of this embodiment includes a grille plate 7, which is mounted on the air inlet body 3 and rises and falls synchronously with the air inlet body 3. The grille plate 7 is tilted downward from front to back, and has an oil guide surface 70. The vertical projection of the rear edge of the second plate body 62 falls on the oil guide surface 70. In addition, the rear edge of the second plate body 62 has oil leakage notches 623 distributed at intervals. The purpose of providing the oil leakage notches 623 is to prevent the oil from flowing along the edge when the range hood is suspended and tilted left and right.

[0386] The main body of the grille plate 7 has oil guide channels 73 arranged at intervals. The oil guide channels 73 are arranged on the rear side of the oil guide surface 70 and are connected to each other by oil paths, that is, the oil on the oil guide surface 70 can flow into the oil guide channels 73. In this embodiment, oil leakage holes 74 are opened at the left and right of the lowest point of each oil guide channel 73. The projection of the oil leakage hole 74 in the vertical direction falls into the oil cup 4. The oil in the oil guide channel 73 eventually drips into the oil cup 4 through the oil leakage hole 74, reducing the risk of accumulated oil overflow. Since the grille plate 7 extends obliquely downward from front to back, the oil is guided to the rear of the air inlet body 3 and then drips, reducing the user's visibility of the oil. In addition, the two sides of the oil guide channel 73 have upwardly bent upper flanges 731, which gather the oil to prevent the disorderly flow of the oil on the one hand, and improve the structural strength on the other hand. Taking into account the ventilation area and the oil discharge efficiency, the width of the oil guide channel 73 in the middle area of ​​the present embodiment is greater than the width of the oil guide channel 73 in the left and right side areas of the grille plate 7, and the oil guide channel 73 in the middle area corresponds to the oil collecting groove 621 of the second plate body 62. Since the oil collecting groove 621 is equivalent to an oil collecting chamber and receives more oil, the oil flowing out of the oil collecting groove 621 enters the oil cup 4 through the wider oil guide channel 73, which can improve the oil discharge efficiency and avoid oil overflow from the oil guide channel 73.

[0387] A lower front plate 9 is installed on the rear side of the second plate body 62, the top of the lower front plate 9 is fixed to the rear side of the upper front plate 62, and the lower front plate 9 is vertically arranged, and the air inlet body 3 can move up and down along the lower front plate 9. A wider upper air inlet channel is formed between the upper front plate 9 and the rear plate of the lower box body 2, and a narrower lower air inlet channel is formed between the lower front plate 9 and the rear plate of the lower box body. After the oil smoke enters from the air inlet body 3, it passes through the lower air inlet channel and the upper air inlet channel in turn and is sucked into the fan 5. Since the front-to-back width of the lower air inlet channel is narrow, the oil smoke flow rate is fast, which can drive the external flow field to achieve faster pulling of the airflow, give the oil smoke a greater backward speed in the same time, and prevent the oil smoke from escaping. The upper air inlet channel can construct an efficient pressure stabilizing chamber, so that the airflow is buffered and stabilized in the pressure stabilizing chamber, which is conducive to improving the oil smoke absorption effect.

[0388] In this embodiment, the grille plate 7 is arranged at the rear side of the lower front plate 9. When the air inlet body 3 moves upward relative to the lower box body 2, the grille plate 7 moves from the lower part of the lower front plate 9 to the upper part of the lower front plate 9. Therefore, during the lifting and lowering process of the air inlet body 3, the grille plate 7 can cooperate with the lower front plate 9, and a line seal can be formed between the grille plate 7 and the lower front plate 9, thereby reducing the probability of oil smoke leakage.

[0389] The rear edge of the second plate body 62 has an oil-guiding fold 622 extending backward from the lower front plate 9, the oil-guiding fold 622 extends backward and downward, the projection of the rear edge of the oil-guiding fold 622 in the vertical direction falls on the oil-guiding surface 70 of the grille plate 7, and the oil leakage notch 623 is provided on the oil-guiding fold 622. In order to avoid the oil collecting groove 621 of the second plate body 62, the front side of the grille plate 7 has an upwardly folded flange 71, and a clearance notch 72 for avoiding the oil collecting groove 621 is provided in the middle position of the flange 71.

[0390] In this embodiment, the air inlet body 3 has a smoke inlet 31, and an upper guide plate 10 is installed at the front bottom of the grille plate 7. The upper guide plate 10 is vertically arranged above the smoke inlet 31. The upper guide plate 10 can lower the height of the smoke inlet 31 so that the oil smoke is sucked in when it is still at a certain distance from the lower box body 2. On the one hand, it can reduce the condensed oil on the surface of the lower box body 2, and on the other hand, it can reduce the leakage of oil smoke.

[0391] A front sealing strip 8 is installed on the front side of the grille plate 7 of the present embodiment, and the leading edge of the front sealing strip 8 is close to the rear side of the lower front plate 9. The front sealing strip 8 is a rubber seal, and the front sealing strip 8 is clamped between the grille plate 7 and the upper guide plate 10. After the front sealing strip 8 is set, during the descent of the air inlet body 3, a certain degree of sealing structure is formed between the front sealing strip 8 and the lower front plate 9, that is, a moving seal is realized, which is a line seal here, so as to avoid leakage of oil smoke and prevent pressure relief. In order to further enhance the pressure relief effect, the bottom of the lower front plate 9 has a lower folded edge 91 bent backward and downward, and a certain degree of sealing structure is also formed between the lower folded edge 91 and the upper guide plate 10, which is a line seal here. In addition, see Fig. 20 As shown, the top of the upper guide plate 10 has an upper folding edge 101 that is bent forward and upward, and the opposite surfaces of the lower folding edge 91 and the upper folding edge 101 can be parallel or approximately parallel to each other. When the lower box body 2 is lowered to the lowest position, the opposite surfaces of the lower folding edge 91 and the upper folding edge 101 are abutted or close to each other to form a surface seal between the upper guide plate 10 and the lower front plate 9. At this time, the above two line seals become surface seals, which have a better sealing effect, can better prevent pressure release, and ensure the oil fume absorption effect. In addition, the projection of the rear edge of the lower folding edge 91 in the vertical direction falls into the oil cup 4, so that the oil on the lower folding edge 91 can smoothly enter the oil cup 4.

[0392] In addition, the bottom of the upper guide plate 10 is bent backward to form an oil guide groove 102. After the oil guide groove 102 is set, on the one hand, the oil receiving area of ​​the upper guide plate 10 can be increased to ensure that it can receive more dripping oil and avoid excessive air duct resistance. On the other hand, the oil in the oil guide groove 102 can be guided to drip to the left and right sides, reducing the oil dripping directly seen by the user.

[0393] When the range hood is not in operation, Figures 11 to 14 As shown, the lower box body 2 rises to the highest position, the air inlet body 3 rises to the highest position synchronously and is hidden inside the lower box body 2, and the lower bottom surface of the oil cup 4 is flush with the lower bottom surface of the lower box body 2. The range hood structure is very compact and can be completely hidden in the cabinet.

[0394] When the range hood is in operation, Figures 17 to 20 As shown, the lower box 2 is lowered to the lowest position, and the air inlet 3 is simultaneously lowered to the lowest position and extends downward from the bottom of the lower box 2, the smoke inlet 31 of the air inlet 3 is exposed, and the negative pressure area is lowered to improve the oil smoke absorption effect. In addition, under different working conditions, the lowering stroke of the lower box 2 and the air inlet 3 can be intelligently controlled.

[0395] Embodiment three:

[0396] like Figures 21 to 28 As shown, the lifting type range hood of this embodiment comprises an upper box body 1, a lower box body 2 and an air inlet body 3. A fan system 5 is installed in the upper box body 1, and the lower box body 2 is arranged on the upper box body 1 and can move up and down relative to the upper box body 1, and the lower box body 2 is wrapped around the outer surface of the upper box body 1. Fig. 22 The direction indicated by the middle arrow A is backward, and the air inlet body 3 is arranged at the rear of the lower box body 2 and can move up and down relative to the lower box body 2. The lower box body 2 and the air inlet body 3 can move synchronously under the drive of a set of driving mechanisms, or they can move separately under the drive of independent driving mechanisms.

[0397] An oil guide plate 6 extending from front to back is provided inside the lower box 2, and the oil guide plate 6 is arranged obliquely downward from front to back. The oil guide plate 6 can adopt an integral flat plate structure, that is, the oil guide plate 6 has a first side, a second side and a third side, and the lower box 2 has mounting plates on the left and right sides, the first side is directly or indirectly connected to the left mounting plate, the second side is directly or indirectly connected to the right mounting plate, and the third side is directly or indirectly connected to the lower box front plate, and the left and right mounting plates, the oil guide plate 6 and the lower box front plate form an air inlet cavity in the lower box 2. In this way, on the one hand, the oil guide plate 6 receives the oil inside the range hood, and the oil enters the oil cup at the bottom of the air inlet body through the oil guide plate 6; on the other hand, the oil guide plate 6 constitutes the bottom surface of the air inlet cavity, and a pressure-stabilizing chamber for airflow buffering is constructed inside the lower box body 2, which provides a buffering space for the oil smoke, thereby improving the oil smoke absorption effect and reducing the influence of the airflow on the trajectory of the oil droplets, avoiding the splashing of oil droplets dripping from the volute, and helping to maintain the cleanliness of the interior of the range hood.

[0398] Combination Fig. 27 As shown, the oil guide plate 6 of the present embodiment is an L-shaped structure, that is, it includes a vertical plate body and a horizontal plate body extending from the lower edge of the vertical plate body from front to rear, and the left and right sides of the horizontal plate body respectively form a left side 64 and a right side 65, the left side 64 is directly or indirectly connected to the left mounting plate 81, and the right side 65 is directly or indirectly connected to the right mounting plate 82, and the vertical plate body of the oil guide plate 6 is fixed on the lower box front plate 21 and / or the lower box top plate 22, so that the left mounting plate 81, the right mounting plate 82, and the oil guide plate 6 form an air inlet cavity 9 in the lower box 2.

[0399] The middle area of ​​the oil guide plate 6 has a concave oil collecting groove structure 61. Preferably, the bottom surface of the oil collecting groove structure 61 is inclined downward from front to back relative to the horizontal plane, and the inclination angle of the oil collecting groove structure 61 relative to the horizontal plane is not greater than 5°. In addition, the oil collecting groove structure 61 is not limited to being inclined downward from front to back. For example, the oil collecting groove structure 61 can also meet the following conditions: the angle between the bottom surface of the oil collecting groove structure 61 and the bottom surface of the rest of the oil guide plate 6 except the oil collecting groove structure 61 is in the range of -2° to 2°.

[0400] In this embodiment, the projection of the front side of the upper box body 1 in the vertical direction falls on the oil guide plate 6. That is, the structure of the lower box body 2 wrapping the upper box body 1 is adopted, so that the oil on the upper box body 1 can smoothly flow into the oil guide plate 6 inside the lower box body 2.

[0401] The upper housing 1 is provided with a fume extractor fan 5, which has an oil leakage hole (not shown in the figure), and the vertical projection of the oil leakage hole falls on the oil collecting tank structure 6. One function of the oil collecting tank structure 61 is equivalent to an oil collecting chamber, and the oil in the fume extractor fan 5 drips into the oil collecting tank structure 61 through the oil leakage hole. The oil collecting tank structure 61 guides the oil of the fume extractor fan 5 downward in an orderly manner to the oil cup 4 at the bottom of the air inlet body 3, thereby avoiding the disorderly guidance of the oil of the fume extractor fan 5 and improving the cleanliness and oil discharge efficiency inside the whole machine.

[0402] When the lower box 2 is raised to the highest position, the bottom of the range hood fan 5 extends into the oil collecting tank structure 61. In this way, another function of the oil collecting tank structure 61 is to avoid interference with the fan volute after the whole machine is folded, reduce the height of the whole machine, improve the adaptability and convenience of installation, and save manufacturing costs.

[0403] The air inlet body 3 of this embodiment has an oil filter plate 7, which is arranged at the rear side of the oil guide plate 6 and is arranged obliquely downward from front to back. The front part of the oil filter plate 7 has an oil guide surface 71. Fig. 27 The rear part of the oil guide plate 6 has a downwardly bent oil guide fold 62, and the projection of the rear edge of the oil guide fold 62 in the vertical direction falls into the oil guide surface 71, so as to ensure that the oil on the oil guide plate 6 can drip smoothly onto the oil filter plate 7. In addition, the rear edge of the oil guide fold 62 is provided with oil leakage notches 63 distributed at intervals, so as to prevent the oil from flowing along the rear edge of the oil guide plate 6 when the range hood is suspended and tilted left or right.

[0404] The oil filter plate 7 is in a grid shape, and has oil guide channels 72 arranged at intervals in the left and right directions. The oil guide channels 72 are located at the rear side of the oil guide surface 71, and the width of the oil guide channels 72 in the middle area is greater than the width of the oil guide channels 72 in the left and right areas of the oil filter plate 7. The location of the oil guide channels 72 in the middle area corresponds to the oil collecting tank structure 61, that is, the oil guided from the oil collecting tank structure 61 enters the oil guide channels 72 in the middle area. In addition, an oil leakage port 73 is opened at the lowest position of each oil guide channel 72, and the projection of the oil leakage port 73 in the vertical direction falls in the oil cup 4. The oil that falls from the oil guide plate 6 onto the oil filter plate 7 eventually flows into the oil cup 4 through the oil leakage port 73, thereby improving the oil guiding efficiency and reducing the risk of accumulated oil overflow.

[0405] Embodiment 4:

[0406] like Figure 29 to Figure 35 As shown, the lifting type range hood of this embodiment comprises an upper box body 1, a lower box body 2 and an air inlet body 3. A fan system 8 is installed in the upper box body 1, and the lower box body 2 is arranged on the upper box body 1 and can move up and down relative to the upper box body 1, and the lower box body 2 is wrapped around the outer surface of the upper box body 1. Fig.31The direction indicated by the middle arrow B is backward, and the air inlet body 3 is arranged at the rear of the lower box body 2 and can move up and down relative to the lower box body 2, that is, the upper box body 1, the lower box body 2 and the air inlet body 3 constitute a two-stage lifting mechanism. The lower box body 2 and the air inlet body 3 can move synchronously under the drive of a set of driving mechanisms, or they can move separately under the drive of independent driving mechanisms.

[0407] An oil cup 4 is installed at the bottom of the air inlet body 3. The lower box body 2 has an air inlet channel 21 for the air inlet body 3 to be raised and lowered. The air inlet body 3 has a scraper. During the lifting process of the air inlet body 3, the scraper can scrape the oil on the inner wall of the air inlet channel 21 into the oil cup 4.

[0408] Specifically, the lower box body 2 has a lower front plate 22 and a back plate 23. The lower front plate 22 constitutes the front wall of the air inlet channel 21, and the back plate 23 constitutes the rear wall of the air inlet channel 21. Both the lower front plate 22 and the back plate 23 have vertical surfaces that match the scraper. The lower edge of the lower front plate 22 extends downward and backward with a lower folded edge 221. The projection of the rear edge of the lower folded edge 221 in the vertical direction falls in the oil cup 4. The projection of the lower edge of the back plate 23 in the vertical direction falls in the oil cup 4, ensuring that the oil on the wall surface of the lower front plate 22 and the back plate 23 can flow into the oil cup 4.

[0409] Driven by the driving mechanism, the air inlet body 3 performs lifting and lowering movements in the air inlet channel 21. An oil filter plate 31 is installed on the top of the air inlet body 3. The oil filter plate 31 is tilted downward from front to back, that is, the oil filter plate 31 is located on the rear side of the lower front plate 22 and on the front side of the back plate 23. In this embodiment, a front scraper is installed on the front side of the oil filter plate 31, and a rear scraper is installed on the rear side of the oil filter plate 31. Specifically, the front scraper is a front scraper strip 6, and the rear scraper is a rear scraper strip 7. Both the front scraper strip 6 and the rear scraper strip 7 are rubber seals. During the lifting and lowering process of the air inlet body 3, the front scraper strip 6 is used to scrape off the oil on the wall of the lower front plate 22, and the rear scraper strip 7 is used to scrape off the oil on the wall of the back plate 23. In addition, in order to allow the oil to flow down smoothly during the scraping process, a front oil leakage notch 61 is provided on the front edge of the front scraper strip 6, and a rear oil leakage notch 71 is provided on the rear edge of the rear scraper strip 7. See FIG. Fig.33 .

[0410] The air inlet body 3 has a smoke inlet 30, and an upper guide plate 5 is installed at the front bottom of the oil filter plate 31. The upper guide plate 5 is vertically arranged above the smoke inlet 30. The upper guide plate 5 can lower the height of the smoke inlet 30 so that the oil smoke is sucked in when it is still at a certain distance from the lower box body 2. On the one hand, it can reduce the condensed oil on the surface of the lower box body 2, and on the other hand, it can reduce the leakage of oil smoke.

[0411] In this embodiment, the front scraper strip 6 is clamped between the oil filter plate 31 and the upper guide plate 5, and the front scraper strip 6 extends forward from the front edge of the oil filter plate 31. The rear scraper strip 7 is placed on the rear side of the oil filter plate 31 and is connected and fixed by a connecting piece, and the rear scraper strip 7 extends backward from the rear edge of the oil filter plate 31. There are certain gaps between the front scraper strip 6 and the lower front plate 22, and between the rear scraper strip 7 and the back plate 23. During the descent of the air inlet body 3, a certain degree of sealing structure is formed between the front scraper strip 6 and the lower front plate 22, that is, a motion seal is realized, which is a line seal here, so as to avoid oil smoke leakage and prevent pressure relief. Similarly, a motion seal is also formed between the rear scraper strip 7 and the back plate 23.

[0412] In order to further improve the pressure relief effect, the bottom of the lower front plate 22 has a lower folded edge 221 bent backward and downward, and a certain degree of sealing structure is formed between the lower folded edge 221 and the upper guide plate 5, which is a line seal. In addition, the top of the upper guide plate 5 has an upper folded edge 51 bent forward and upward, and the lower folded edge 221 and the upper folded edge 51 have opposite surfaces. In this embodiment, the above opposite surfaces are parallel to each other. When the lower box body 2 is lowered to the lowest position, the lower folded edge 221 and the upper folded edge 51 are close to each other to form a surface seal between the upper guide plate 5 and the lower front plate 22, which has a better sealing effect, can better prevent pressure relief, and ensure the oil fume absorption effect.

[0413] Embodiment five:

[0414] like Figure 36 to Figure 43 As shown, the range hood of this embodiment comprises an upper box body 1, a lower box body 2 and an air inlet body 3. The lower box body 2 is arranged on the upper box body 1 and can move up and down relative to the upper box body 1, and the lower box body 2 is wrapped around the outer surface of the upper box body 1. Fig.37 The direction indicated by the middle arrow A is backward, and the air inlet body 3 is arranged at the rear of the lower box body 2 and can move up and down relative to the lower box body 2. The lower box body 2 and the air inlet body 3 can move synchronously under the drive of a set of driving mechanisms, or they can move separately under the drive of independent driving mechanisms.

[0415] An oil guide plate 4 extending from front to back is provided inside the lower box 2. The oil guide plate 4 can be an integral flat plate structure, that is, the oil guide plate 4 has a first side, a second side and a third side. The lower box 2 has mounting plates on the left and right sides. The first side is directly or indirectly connected to the left mounting plate, the second side is directly or indirectly connected to the right mounting plate, and the third side is directly or indirectly connected to the front plate of the lower box. The mounting plates on the left and right sides, the oil guide plate 4 and the front plate of the lower box form an air inlet cavity inside the lower box 2. In this way, the oil guide plate 4, on the one hand, receives the oil inside the range hood, and the oil enters the oil cup at the bottom of the air inlet body through the oil guide plate 4. On the other hand, the oil guide plate 4 forms the bottom surface of the air inlet cavity, and a pressure stabilizing cavity for airflow buffering is constructed inside the lower box 2, providing a buffering space for oil smoke, which can not only improve the oil smoke absorption effect, but also reduce the influence of airflow on the trajectory of oil droplets, avoid splashing of oil droplets dripping from the volute, and help maintain the cleanliness of the interior of the range hood.

[0416] Combination Fig.39 and Fig.43 As shown, the oil guide plate 4 of the present embodiment is an L-shaped structure, that is, it includes a vertical plate body and a horizontal plate body extending from the lower edge of the vertical plate body from front to rear, the horizontal plate body is arranged obliquely downward from front to rear, and the left and right sides of the horizontal plate body respectively form a left side edge 44 and a right side edge 45, the left side edge 44 is directly or indirectly connected to the left mounting plate 81, and the right side edge 45 is directly or indirectly connected to the right mounting plate 82, and the vertical plate body of the oil guide plate 4 is fixed on the lower box front plate 21 and / or the lower box top plate 22, so that the left mounting plate 81, the right mounting plate 82, and the oil guide plate 6 form an air inlet cavity 9 in the lower box 2.

[0417] The middle area of ​​the oil guide plate 4 is formed with a concave profiled structure 41. Preferably, the bottom surface of the profiled structure 41 is inclined downward from front to back relative to the horizontal plane, and the inclination angle of the profiled structure 41 relative to the horizontal plane is not greater than 5°. In addition, the profiled structure 41 is not limited to being inclined downward from front to back. For example, the profiled structure 41 can also meet the following conditions: the angle between the bottom surface of the profiled structure 41 and the bottom surface of the rest of the oil guide plate 4 except the profiled structure 41 is in the range of -2° to 2°.

[0418] The upper housing 1 is provided with a fume extractor fan 7, which has an oil leakage hole (not shown in the figure), and the vertical projection of the oil leakage hole falls on the profiled structure 41. One function of the profiled structure 41 is to act as an oil collecting chamber, and the oil in the fume extractor fan 7 drips to the profiled structure 41 through the oil leakage hole. The profiled structure 41 guides the oil of the fume extractor fan 7 downward in an orderly manner to the oil cup 6 at the bottom of the air inlet body 3, thereby avoiding the disorderly guidance of the oil of the fume extractor fan 7 and improving the cleanliness and oil discharge efficiency inside the whole machine.

[0419] The air inlet body 3 of this embodiment has a grille plate 5, which is arranged at the rear side of the oil guide plate 4 and is arranged obliquely downward from front to back, and the left and right width of the grille plate 5 is greater than the left and right width of the oil guide plate 4. The front part of the grille plate 5 has an oil guide surface 51. The grille plate 5 has oil guide channels 52 distributed in the front and rear directions, and the oil guide channels 52 are arranged at intervals in the left and right directions. The oil guide channels 52 are located at the rear side of the oil guide surface 51 and are in oil communication with the oil guide surface 51, and the width of the oil guide channels 52 in the middle area is greater than the width of the oil guide channels 52 in the left and right side areas of the grille plate 5. The position of the oil guide channel 52 in the middle area corresponds to the profiled structure 41, that is, the oil guided from the profiled structure 41 enters the oil guide channel 52 in the middle area. Since the oil on the oil guide plate 4 is mainly concentrated in the profiled structure 41, and the middle oil guide channel 52 corresponding to the profiled structure 41 is wider, the oil can flow smoothly through the middle oil guide channel 52 into the oil cup 6, avoiding the oil from overflowing from the oil guide channel 52, thereby improving the oil discharge efficiency.

[0420] See also Fig.37 and Fig.42 The rear part of the oil guide plate 4 has a downwardly bent oil guide fold 42, and the projection of the rear edge of the oil guide fold 42 in the vertical direction falls into the oil guide surface 51, so as to ensure that the oil on the oil guide plate 4 can smoothly drip onto the grille plate 5. In addition, the rear edge of the oil guide fold 42 is provided with oil leakage notches 43 distributed at intervals, so as to prevent the oil from flowing along the rear edge of the oil guide plate 4 when the range hood is suspended and tilted left and right.

[0421] In addition, an oil leakage port 53 is opened at the lowest position of each oil guide channel 52, and the projection of the oil leakage port 53 in the vertical direction falls into the oil cup 6. The oil that falls from the oil guide plate 4 onto the grid plate 5 eventually flows into the oil cup 6 through the oil leakage port 53, thereby improving the oil guide efficiency and reducing the risk of oil overflow.

[0422] Embodiment six:

[0423] like Figures 44 to 51 As shown, the lifting type range hood of this embodiment comprises an upper box body 1, a lower box body 2 and an air inlet body 3. The lower box body 2 is arranged on the upper box body 1 and can move up and down relative to the upper box body 1, and a fan 6 is installed inside the upper box body 1, and the lower box body 2 is wrapped around the outer surface of the upper box body 1. Fig.45 The direction indicated by the middle arrow A is backward, the air inlet body 3 is arranged at the rear of the lower box body 2 and can move up and down relative to the lower box body 2, and an oil cup 7 is installed at the bottom of the air inlet body 3. The lower box body 2 and the air inlet body 3 can move synchronously under the drive of a set of driving mechanisms, or they can move separately under the drive of independent driving mechanisms.

[0424] The lower box body 2 has a first oil guide member 4, and the air inlet body 3 has a second oil guide member. The second oil guide member rises and falls with the air inlet body 3. When the air inlet body 3 rises to the highest position, the second oil guide member is located below the first oil guide member 4.

[0425] like Fig.47 As shown, the first oil guide member 4 of this embodiment has a transversely arranged plate body 42, the plate body 42 has a concave profile structure 43, and the bottom surface of the profile structure 43 is inclined downward from front to back relative to the horizontal plane. The profile structure 43 is equivalent to the oil collecting chamber, and the oil in the fan 6 drips to the profile structure 43 through the oil leakage hole. The profile structure 43 guides the oil of the fan 6 downward and orderly to the oil cup 7 at the bottom of the air inlet body 3, avoiding the disorderly guidance of the oil of the fan 6, and improving the cleanliness and oil discharge efficiency of the whole machine. When the lower box body 2 rises to the highest position along the upper box body 1, the bottom of the fan 6 is placed in the profile structure 43, so that the whole machine is prevented from interfering with the fan volute after being folded, and the height of the whole machine in the non-working state is reduced, which is convenient for the whole machine to be hidden in the cabinet, and the adaptability and convenience of installation are improved, and the aesthetics are improved.

[0426] In addition, the rear edge of the first oil guide member 4 has an oil guide fold 41, which extends downward and rearward for the convenience of oil guide. The rear portion of the profiled structure 43 also has an oil guide fold 41. The rear edge of the oil guide fold 43 has oil leakage notches 44 arranged at intervals, thereby preventing the oil from flowing along the rear edge of the first oil guide member 4 when the range hood is suspended and tilted left or right.

[0427] like Fig.48 As shown, the second oil guide member 5 of the present embodiment has a grille plate 5, the front side of the grille plate 5 has an upwardly folded flange 51, and the front side of the grille plate 5 has a clearance notch 52 for avoiding the press-type structure 43, and the clearance notch 52 is located in the middle of the flange 51. After the clearance notch 52 is provided, the air inlet body 3 can be raised to the highest position as much as possible, so that the air inlet body 3 is conveniently hidden in the lower box body 2 as a whole, making the structure of the range hood more compact and simple, and at the same time, it is also conducive to reducing the overall height of the range hood, so that the whole machine is conveniently hidden in the cabinet, and the appearance is high.

[0428] The projection of the rear edge of the oil guide fold 41 on the front side oil guide surface 53 in the vertical direction falls on the oil guide surface 53 to ensure that the oil of the first oil guide member 4 can drip smoothly onto the grid plate 5. The grid plate 5 is arranged obliquely downward from front to back, and the grid plate 5 has oil guide channels 54 arranged at intervals, and the width of the oil guide channels 54 in the middle area is greater than the width of the oil guide channels 54 in the left and right side areas of the grid plate 5, and the oil guide channels 54 in the middle area correspond to the profiled structure 43 of the plate body 42. Since the oil on the first oil guide member 4 is mainly concentrated in the profiled structure 43, and the middle oil guide channel 54 corresponding to the profiled structure 43 is wider, the oil can flow smoothly through the middle oil guide channel 54 into the oil cup 7, avoiding the oil from overflowing from the oil guide channel 54, and improving the oil discharge efficiency.

[0429] Embodiment seven:

[0430] like Figure 52 to Figure 59 As shown, the lifting type range hood of this embodiment comprises an upper box body 10, a lower box body 1 and an air inlet body 2. A fan system 11 is installed in the upper box body 10, and the lower box body 1 is wrapped around the outer surface of the upper box body 10 and can move up and down relative to the upper box body 10. Fig.54 The direction indicated by the middle arrow C is backward. The air inlet body 2 is accommodated in the rear part of the lower box body 1 and can move up and down relative to the lower box body 1. The air inlet body 2 has an air inlet 21. When the air inlet body 2 descends, the air inlet 21 is exposed below the lower box body 1. When the air inlet body 2 rises, the air inlet 21 is hidden inside the lower box body 1. An oil cup 6 is installed at the bottom of the air inlet body 2. The upper box body 10, the lower box body 1 and the air inlet body 2 constitute a two-level lifting mechanism. The lower box body 1 and the air inlet body 2 can move synchronously under the drive of a set of driving mechanisms, or they can move separately under the drive of independent driving mechanisms.

[0431] In this embodiment, a first seal is provided on the air inlet body 2, and a second seal is provided on the lower box body 1. The first seal is located above the second seal, and the vertical projection of the first seal at least partially overlaps with the second seal. The sealing between the lower box body 1 and the air inlet body 2 is achieved by the first seal and the second seal.

[0432] In this embodiment, a grille plate 3 is provided on the air inlet body 2, and the grille plate 3 is fixed on the top of the air inlet main body of the air inlet body 2. The grille plate 3 rises and falls with the rise and fall of the air inlet body 2. An upper guide plate 4 is installed at the front bottom of the grille plate 3, and the upper guide plate 4 is vertically arranged above the air inlet 21. The top of the upper guide plate 4 has an upper folding edge 41 bent forward and upward, and the upper folding edge 41 constitutes a first sealing member. When the air inlet body 2 is at the lowest position, the lower edge of the upper guide plate 4 is located below the bottom of the lower box body 1. The upper guide plate 4 can lower the height of the air inlet 21, so that the oil smoke is sucked in when it is still at a certain distance from the lower box body 1. On the one hand, it can reduce the condensed oil on the surface of the lower box body 1, and on the other hand, it can reduce the leakage of oil smoke.

[0433] An upper front plate 8 is installed inside the lower box body 1, and a lower front plate 5 is installed at the rear and lower part of the upper front plate 8. The lower front plate 5 is vertically arranged, and the rear side of the lower front plate 5 is close to the front edge of the upper folding edge 41. In addition, a scraper 7 is sandwiched between the upper folding edge 41 and the grille plate 3, and the front edge of the scraper 7 is close to the rear side of the lower front plate 5, and a certain gap is formed between the front edge of the scraper 7 and the rear side of the lower front plate 5. During the descent of the air inlet body 2, a certain degree of sealing structure is formed between the scraper 7 and the lower front plate 5, that is, a motion seal is realized, which is a line seal here, so as to avoid oil smoke leakage and prevent pressure relief. And the scraper 7 can scrape the oil on the rear side of the lower front plate 5 into the oil cup 6.

[0434] The bottom of the lower front plate 5 has a lower folded edge 51 bent backward and downward, which constitutes a second sealing member, and the projection of the rear edge of the lower folded edge 51 in the vertical direction falls into the oil cup 6. When the air inlet body 2 is in the descending state, the rear edge of the lower folded edge 51 is close to the front side of the upper guide plate 4, and there is a certain gap between the rear edge of the lower folded edge 51 and the front side of the upper guide plate 4. A certain degree of sealing structure is also formed between the lower folded edge 51 and the upper guide plate 4, which is a line seal, thereby improving the anti-pressure relief effect.

[0435] like Fig.58 and Fig.59 As shown, the lower folded edge 51 of this embodiment is parallel to the opposite surface of the upper folded edge 41. When the air inlet body 2 is lowered to the lowest position, in this embodiment, the lower box body 1 and the air inlet body 2 are synchronously lifted and lowered. When both the lower box body 1 and the air inlet body 2 are lowered to the lowest position, the opposite surfaces of the upper folded edge 41 and the lower folded edge 51 are close to each other to form a surface seal. Compared with line sealing, surface sealing has a better effect, can better prevent pressure release, and ensure the effect of absorbing oil smoke.

[0436] Embodiment eight:

[0437] like Figure 60 to Figure 67 As shown, the lifting type range hood of this embodiment comprises an upper box body 1, a lower box body 2 and an air inlet body 3. A fan system 10 is installed in the upper box body 1, and the lower box body 2 is arranged on the upper box body 1 and can move up and down relative to the upper box body 1, and the lower box body 2 is wrapped around the outer surface of the upper box body 1. Fig.63 The direction indicated by the middle arrow B is forward, the air inlet body 3 is stored in the rear of the lower box body 2 and can move up and down relative to the lower box body 2, and an oil cup 4 is installed at the bottom of the air inlet body 3. The lower box body 2 and the air inlet body 3 can move synchronously under the drive of a set of driving mechanisms 9, or they can move separately under the drive of independent driving mechanisms.

[0438] like Fig.61 , Fig.63 and Fig.64 As shown, Fig.61The direction indicated by the arrow A is backward. Fig.64 The direction indicated by the middle arrow C is right, and oil guide side plates 5 are installed on the left and right sides of the lower box body 2, a first oil guide part is installed inside the lower box body 2, and a second oil guide part is installed on the air inlet body 3. The oil in the upper box body 1 can be guided through the inner wall of the oil guide side plate 5 to flow into the first oil guide part and the second oil guide part. The second oil guide part is located below the first oil guide part to receive the oil dripping from the first oil guide part. The oil flowing from the oil guide side plate 5 and the first oil guide part to the second oil guide part finally flows into the oil cup 4.

[0439] In this embodiment, the oil guide side plate 5 includes a vertically arranged inner plate 51, a middle plate 52 extending obliquely downward from the lower edge of the inner plate 51 from the inside to the outside, and an outer plate 53 extending vertically downward from the outer edge of the middle plate 52. The middle plate 52 in this embodiment is a flat plate. The inner plate 51 is arranged on the outer side of the upper box body 1. The upper box body 1 includes a fan frame 11 and a decorative cover 12 arranged outside the fan frame 11. The left and right sides of the bottom of the fan frame 11 are installed with sealing strips 8. The inner plate 51 of the oil guide side plate 5 is arranged on the outer side of the decorative cover 12 and is sealed with the fan frame 11 through the sealing strip 8. Fig.64 and Fig.65 As shown, when the lower box body 2 is lowered to the lowest position, that is, in the working state, the upper part of the inner plate 51 of the oil guide side plate 5 is sealed with the fan frame 11 through the sealing strip 8, thereby preventing the oil from escaping here. The above-mentioned oil guide side plate 5 is installed in the lower box body 2. On the one hand, the oil is guided by the oil guide side plate 5, which is conducive to gathering the oil on the inner side of the oil guide side plate 5 to both sides, thereby reducing the problem of disorderly dripping of the oil during the process. On the other hand, an air inlet channel that is wide at the bottom and narrow at the top is formed between the left and right oil guide side plates 5. Under the guidance of the air inlet channel, the oil airflow entering the lower box body 2 from the smoke inlet 30 of the air inlet body 3 can quickly flow into the fan system 10, which is conducive to improving the oil fume absorption effect.

[0440] The first oil guide member of this embodiment is a first oil guide plate 6 extending from front to rear, and the first oil guide plate 6 is arranged obliquely downward from front to rear. The second oil guide member is a second oil guide plate 7 arranged at the rear lower part of the first oil guide member, and the second oil guide plate 7 is specifically a grille plate installed on the top of the air inlet body 3. The grille plate has a front oil guide surface 71 and left and right oil guide surfaces 72. The projection of the rear edge of the first oil guide plate 6 in the vertical direction falls on the front oil guide surface 71.

[0441] like Fig.66 and Fig.67As shown, the outer plate 53 has a front oil guide wall 531 and a rear oil guide wall 532. The front oil guide wall 531 and the rear oil guide wall 532 both play the role of guiding oil. The projection of the front oil guide wall 531 in the vertical direction falls on the first oil guide plate 6. The left and right edges of the first oil guide plate 6 both have an upper flange 61 that is folded upward. The lower edge of the front oil guide wall 531 has an inner flange 533 that is folded inward. The inner flange 533 is arranged on the inner side of the upper flange 61 and is adjacent to the first oil guide plate 6, and the lower edge of the inner flange 533 is lower than the upper edge of the upper flange 61. As a result, the oil on the front oil guide wall 531 of the oil guide side plate 5 can flow smoothly into the first oil guide plate 6.

[0442] The projection of the rear oil guide wall 532 in the vertical direction falls on the left and right oil guide surfaces 72 of the second oil guide plate 7. The air inlet body 3 includes an air inlet portion 31 and extension portions 32 extending vertically upward from the left and right sides of the air inlet portion 31. The air inlet portion 31 is arranged at the rear side of the first oil guide plate 6, and the second oil guide plate 7 is installed on the top of the air inlet portion 31. The rear oil guide wall 532 is arranged on the inner side of the extension portion 32, and the projection of the inner wall surface of the extension portion 32 in the vertical direction falls on the second oil guide plate 7. Fig.63 As shown, when the air inlet body 3 is lowered to the lowest position, the upper edge of the extension portion 32 is not lower than the lower edge of the rear oil guide wall 532. In this way, the extension portion 32 can be connected with the rear oil guide wall 532. While ensuring the oil fume absorption effect, it can prevent the oil on the rear oil guide wall 532 from flowing out to the outer surface of the extension portion 32, reducing the risk of oil leakage.

[0443] In this embodiment, the specific installation structure of the oil guide side plate 5 is as follows:

[0444] The front edge of the first oil guide plate 6 has an upper front plate 62 that is bent vertically upward, the oil guide side plate 5 has a front flange 54 and a rear flange 55, and the top edge of the inner side plate 51 is formed with a folded edge 511. The front flange 54 is directly or indirectly fixed to the upper front plate 62, the rear flange 55 is directly or indirectly fixed to the back plate 21 of the lower box body 2, and the folded edge 511 is fixed to the top plate 22 of the lower box body 2. In this way, the top and the front and rear sides of the oil guide side plate 5 are connected and fixed, and the installation structure is very firm.

[0445] In non-working state, such as Fig.60 and Fig.61 As shown, the lower box body 2 rises to the highest position, the air inlet body 3 rises to the highest position synchronously and is hidden inside the lower box body 2, and the lower bottom surface of the oil cup 4 is flush with the lower bottom surface of the lower box body 2. The overall volume of the range hood is small and can be completely hidden in the cabinet, which is more simple and beautiful.

[0446] In working state, Figure 62 to Figure 66As shown, the lower box body 2 is lowered to the lowest position, and the air inlet body 3 is simultaneously lowered to the lowest position and extends downward from the bottom of the lower box body 2, the smoke inlet 30 of the air inlet body 3 is exposed, and the negative pressure area is lowered to improve the oil smoke absorption effect. When the range hood is working for a long time, oil will remain on the left and right inner walls of the fan frame 11. The oil can drip directly from the inner wall of the fan frame 11 onto the first oil guide plate 6, or flow to the oil guide side plate 6 first, and then flow along the oil guide side plate 6 to the first oil guide plate 6 and the second oil guide plate 7, and finally drip from the second oil guide plate 7 into the oil cup 4, thereby solving the left and right oil path problems inside the range hood.

[0447] It should be pointed out that the structures of the first to eighth embodiments of the present invention can be applied to the same lift-type range hood.

[0448] Embodiment nine:

[0449] like Figure 68-Figure 80 A preferred embodiment of the range hood of this embodiment is shown, and the range hood comprises a body, a fan system 40 arranged in the body, and a lifting device.

[0450] See also Fig.68 and Fig.71The body includes a first shell 11, a second shell 12 and an air inlet cavity 13. The inner cavity of the first shell 11, the inner cavity of the second shell 12 and the inner cavity of the air inlet cavity 13 are connected. The first shell 11, the second shell 12 and the air inlet cavity 13 are relatively lifted and moved by the above-mentioned lifting device to ensure that the air inlet cavity 13 can be lowered to a position closer to the smoke source to improve the oil fume absorption effect. The first shell 11 is fixed relative to the wall, and the fan system 40 is arranged in the first shell 11 to provide negative pressure for absorbing and exhausting oil fume. The first shell 11 and the second shell 12 are arranged inside and outside and can move up and down relative to each other, and the air inlet cavity 13 and the second shell 12 are arranged inside and outside and can move up and down relative to each other. The left and right dimensions of the first shell 11 are smaller than the left and right dimensions of the second shell 12, and the front and rear dimensions of the first shell 11 are basically the same as the front and rear dimensions of the second shell 12 (specifically, the front and rear dimensions of the first shell 11 are slightly smaller than the front and rear dimensions of the second shell 12). The left-right dimensions of the air inlet cavity 13 are substantially consistent with the left-right dimensions of the second shell 12 (specifically, the left-right dimensions of the air inlet cavity 13 are slightly smaller than the left-right dimensions of the second shell 12), while the front-to-back dimensions of the air inlet cavity 13 are smaller than the front-to-back dimensions of the second shell 12, and are substantially about one-third of the front-to-back dimensions of the second shell 12. More specifically, the top of the second shell 12 has a first opening 121 for the first shell 11 to enter and exit the second shell 12 in the up-down direction, and the shape and size of the first opening 121 are substantially consistent with the shape and size of the cross section (cross section in the horizontal direction) of the first shell 11. The bottom of the second shell 12 has a second opening 122 for the air inlet cavity 13 to enter and exit the second shell 12 in the up-down direction. The shape and size of the second opening 122 are substantially consistent with the shape and size of the cross section (cross section in the horizontal direction) of the air inlet cavity 13. The second opening 122 is arranged at the rear side of the bottom of the second shell 12, so the air inlet cavity 13 is also arranged at the rear relative to the second shell 12, and thus, the bottom area of ​​the second shell 12 located at the part of the air inlet cavity 13 forms a smoke shielding portion 123 for collecting smoke. An air inlet 131 for external smoke to enter is provided on the front side wall of the air inlet cavity 13, and specifically, the air inlet 131 extends in the left and right directions. An oil cup 132 extending left and right is provided at the bottom of the air inlet cavity 13, which is used to receive the oil flowing down from the air inlet cavity 13.

[0451] like Fig.74 As shown, in order to better carry out the wall installation and to ensure the overall stability of the range hood, the rear side wall of the air inlet cavity 13 and the rear side wall of the first shell 11 are both arranged close to the rear side wall of the second shell 12, that is, the rear side wall of the air inlet cavity 13, the rear side wall of the first shell 11 and the rear side wall of the second shell 12 are basically located in the same vertical extension direction.

[0452] Combination Fig.68 and Fig.71When the range hood is folded (generally when it is turned off), the air inlet cavity 13 moves from bottom to top through the second opening 122 at the bottom of the second shell 12 and enters the inner cavity of the second shell 12. After moving into position, the air inlet 131 on the air inlet cavity 13 is blocked by the second shell 12 and closed, and the bottom of the air inlet cavity 13 (that is, the bottom wall of the oil cup 132) is basically flush with the bottom wall of the second shell 12. Similarly, when the second shell 12 moves upward relative to the first shell 11, the first shell 11 enters the inner cavity of the second shell 12 from the first opening 121 at the top of the second shell 12. After moving into position, most of the first shell 11 (the lower part) is accommodated in the second shell 12, while the upper part is exposed relative to the second shell 12, so as to be used for installing the fixing frame and hanging it on the wall. When the second shell 12 and the air inlet cavity 13 rise to the designated position at the same time, they can be flush with the bottom surface of the cabinet, that is, the whole can be hidden in the cabinet, improving the overall aesthetics. When the range hood is extended, the second shell 12 and the air inlet cavity 13 arranged on the second shell 12 move downward relative to the first shell 11. At the same time, the air inlet cavity 13 moves downward relative to the second shell 12, exposing the bottom of the second shell 12 and exposing the air inlet 131. After the second shell 12 and the air inlet cavity 13 move into place, the height position of the second shell 12 is lower than the height position of the first shell 11, and the height position of the air inlet cavity 13 is lower than the height position of the second shell 12. Since the range hood relies on the large stroke of the two-stage drive to make the air inlet 131 of the air inlet cavity 13 move downward more, the range hood can effectively improve the oil fume extraction effect.

[0453] See also Figure 75-Figure 79 The lifting device of this embodiment includes a driving member 21 and a transmission assembly. The driving member 21 adopts a driving motor, and the transmission assembly adopts a two-stage screw transmission assembly. Specifically, the transmission assembly includes a fixed arm 24, a movable arm 25, a first screw rod 22 and a second screw rod 23.

[0454] The driving member 21 of this embodiment preferably adopts a driving motor disposed on the top plate of the first housing 11. The rear side wall of the first housing 11 has a mounting groove 110 that is recessed backward and extends vertically, wherein the transmission assembly as a whole also extends vertically, is disposed in the above-mentioned mounting groove 110, and is opposite to the driving motor disposed on the top plate of the first housing 11 in the vertical direction. The transmission assembly is disposed in the mounting groove 110 that is recessed backward in the first housing 11, so that the rear part of the first housing 11 can be better attached to the wall, thereby ensuring the reliability of the installation of the range hood.

[0455] The fixed arm 24 is rod-shaped as a whole, and defines a accommodating chamber 241 inside. The fixed arm 24 is provided with a first mounting opening 242 that passes from the outside to its accommodating chamber 241 at the end adjacent to the driving member 21, and a first nut 243 fixed relative to the fixed arm 24 is provided at the first mounting opening 242. The fixed arm 24 is provided with an opening at the end away from the driving member 21, and the movable arm 25 can enter and exit the accommodating chamber 241 of the fixed arm 24 through the opening. The fixed arm 24 is also provided with a first connecting member 244 for connecting to the rear side wall of the second shell 12 at the end position adjacent to the driving member 21. The first connecting member 244 can be connected to the second shell 12 using an existing buffer structure, thereby reducing vibration during the lifting process.

[0456] The upper end of the first screw rod 22 is transmission-connected to the power output end of the driving motor, and the lower end is threadedly connected to the first nut 243 at the end of the fixed arm 24. The first screw rod 22 can rotate around its own axis under the drive of the driving motor. When the first screw rod 22 rotates around its own axis, since the fixed arm 24 is fixed relative to the second housing 12, the fixed arm 24 (and the second housing 12) can be driven to move linearly in the up and down directions relative to the first screw rod 22. During the upward movement of the fixed arm 24, the first screw rod 22 gradually extends into the accommodating chamber 241 of the fixed arm 24.

[0457] The second screw rod 23 is rotatably disposed in the accommodating chamber 241 of the fixed arm 24, and its axial length is substantially consistent with the length of the fixed arm 24. Specifically, the upper end of the second screw rod 23 adjacent to the driving motor is rotatably mounted at the upper end position of the fixed arm 24 through a bearing 245, and the lower end of the second screw rod 23 away from the driving motor is disposed in the yield chamber 251 of the movable arm 25 through a corresponding support sleeve 246. Among them, the support sleeve 246 can slide in contact with the inner wall of the yield chamber 251 of the movable arm 25 in the axial direction, thereby ensuring the stability of the rotation of the second screw rod 23 during the upward and downward movement of the movable arm 25 relative to the fixed arm 24, and avoiding the shaking problem. The second screw rod 23 of this embodiment is axially hollow to form an installation channel 231 for the first screw rod 22 to extend into. The mounting channel 231 of the second screw rod 23 is provided with a limiting groove 232 extending along its axial direction. Correspondingly, the first screw rod 22 is provided with a limiting portion 221 at the end position (i.e., the lower end) away from the driving motor. Specifically, the lower end position of the first screw rod 22 is provided with a spline as the above-mentioned limiting portion 221. The spline component can be sleeved on the end of the first screw rod 22 and limited by the corresponding screws and limiting washers. The mounting channel 231 of the second screw rod 23 has an axially extending spline groove as the above-mentioned limiting groove 232. When the first screw rod 22 rotates, the first screw rod 22 and the second screw rod 23 cooperate with each other through the above-mentioned spline and spline groove, so that the first screw rod 22 and the second screw rod 23 can rotate synchronously and slide relative to each other in the axial direction.

[0458] The movable arm 25 of this embodiment has a contracted state in which it is retracted into the accommodating chamber 241 of the fixed arm 24 from the extended state relative to the fixed arm 24. The movable arm 25 is axially hollow to form a clearance chamber 251 for the second screw rod 23 to extend into. The movable arm 25 has a first end (i.e., an upper end) located in the accommodating chamber 241 of the fixed arm 24 and a second end (i.e., a lower end) extending out of the accommodating chamber 241 of the fixed arm 24, wherein the second end of the movable arm 25 is provided with a second connecting portion 253 for connecting to the top of the rear side wall of the air inlet cavity 13.

[0459] The first end (i.e., the upper end) of the movable arm 25 is provided with a second mounting opening that is interlinked with the yielding chamber 251, and the second mounting opening is provided with a second nut 252 fixed relative to the movable arm 25. The second screw 23 is threadedly connected with the second nut 252 on the movable arm 25. When the second screw 23 rotates, the movable arm 25 can be driven to move axially relative to the fixed arm 24. When the movable arm 25 is retracted into the accommodating chamber 241 of the fixed wall and reaches the limit position, most of the second screw 23 also extends into the yielding chamber 251 of the movable arm 25, thereby making the volume of the screw transmission assembly more compact. On the other hand, the fixed arm 24 and the movable arm 25 of this embodiment are both sleeve parts with non-circular cross sections. Specifically, the cross sections of the fixed arm 24 and the movable arm 25 are both square. In this way, the movable arm 25 and the fixed arm 24 can be limited in the circumferential direction. When the second screw 23 rotates, the movable arm 25 can only slide linearly relative to the fixed arm 24, thereby ensuring the stability of the telescopic action of the movable arm 25.

[0460] The above-mentioned first screw rod 22 (the upper end thereof) constitutes the power input end of the transmission assembly of this embodiment, the upper end of the fixed arm 24 (connected to the second shell 12) constitutes the first power output end of the transmission assembly, and the second end of the movable arm 25 (connected to the air inlet cavity 13) constitutes the second power output end of the transmission assembly.

[0461] Considering that in actual situations, the distance that the second shell 12 moves up and down relative to the first shell 11 is not consistent with the distance that the air inlet cavity 13 moves relative to the second shell 12, in order to achieve that the second shell 12 and the air inlet cavity 13 can move synchronously to the position when rising or falling, the pitch of the first screw rod 22 of this embodiment is different from the pitch of the second screw rod 23, and the thread rotation direction of the first screw rod 22 is the same as the thread rotation direction of the second screw rod 23. In this way, when the drive motor rotates in the forward direction, the second shell 12 moves downward relative to the first shell 11, and the air inlet cavity 13 also moves downward relative to the second shell 12 at the same time, and when the drive motor stops rotating, both move downward to the set position. This two-stage lifting method has a designable motion stroke ratio, which can achieve a larger motion stroke, making the lifting and adjusting process of the range hood more efficient. Specifically, the pitch of the first screw rod 22 and the pitch of the second screw rod 23 can be reasonably selected according to the actual lifting distance of the second shell 12 and the air inlet cavity 13. In this embodiment, a control sensor may also be provided to enable the air inlet cavity 13 to hover at any position, thereby meeting the requirements of more usage scenarios.

[0462] The first housing 11 and the second housing 12 of this embodiment are also slidably connected by the first guide rail pair 31, wherein there are two groups of the first guide rail pair 31, which are respectively arranged on the left and right sides of the lifting device, specifically at the left and right corners of the rear part of the first housing 11. Specifically, each group of the first guide rail pair 31 extends vertically as a whole, and specifically includes a first guide rail portion 311 and a second guide rail portion 312 which are perpendicular to each other, the first guide rail portion 311 is connected to the rear side wall of the first housing 11, and the second guide rail portion 312 is connected to the left side wall or the right side wall of the first housing 11. Since the left and right groups of the first guide rail pair 31 both adopt a mutually perpendicular guide rail pair structure, the shaking of the whole machine in the front-to-back and left-to-right directions can be well limited, further improving the stability of the range hood lifting process.

[0463] The second housing 12 is slidably connected to the air inlet cavity 13 via the second guide rail pair 32. In this embodiment, there are also two sets of second guide rail pairs 32, both of which extend vertically. The two sets of second guide rail pairs 32 are also arranged on the left and right sides of the lifting device, specifically on the left and right sides of the air inlet cavity 13.

[0464] The lifting process of the range hood of this embodiment is as follows:

[0465] When the range hood is turned on and the drive motor is activated, the first screw rod 22 and the second screw rod 23 (due to the axially slidable spline matching) rotate in the same direction and slide axially relative to each other, wherein the first screw rod 22 and the first nut 243 of the fixed arm 24 are in transmission matching, driving the fixed arm 24 to move downward, that is, the second housing 12 (and the air inlet cavity 13 provided on the second housing 12) move downward relative to the first housing 11, and at the same time, since the second screw rod 23 and the second nut 252 on the movable arm 25 are also in transmission matching, the movable arm 25 extends downward relative to the fixed arm 24, that is, the air inlet cavity 13 moves downward relative to the second housing 12, exposing the bottom of the second housing 12, and exposing the air inlet 131 on the front side wall. After the second housing 12 and the air inlet cavity 13 are moved into place, the height position of the second housing 12 is lower than the height position of the first housing 11, and the height position of the air inlet cavity 13 is lower than the height position of the second housing 12. Since the range hood relies on the large stroke of the two-stage drive to make the air inlet 131 of the air inlet cavity 13 go down more, the oil fume extraction effect can be effectively improved. When the range hood is folded (generally when it is turned off), the drive motor rotates in the opposite direction, and the air inlet cavity 13 moves from bottom to top through the second opening 122 at the bottom of the second shell 12 to enter the inner cavity of the second shell 12, and after moving to the right position, the air inlet 131 on the air inlet cavity 13 is blocked by the second shell 12 and closed, and the bottom of the air inlet cavity 13 (that is, the bottom wall of the oil cup 132) is basically flush with the bottom wall of the second shell 12. In this process, the second shell 12 moves upward relative to the first shell 11, that is, the first shell 11 enters the inner cavity of the second shell 12 from the first opening 121 at the top of the second shell 12, and after moving to the right position, most of the first shell 11 (the lower part) is accommodated in the second shell 12, and the upper part is exposed relative to the second shell 12, so as to be used to install the fixing frame and hang it on the wall. When the second shell 12 and the air inlet cavity 13 rise to the designated position at the same time, they can be flush with the bottom surface of the cabinet, that is, the whole can be hidden in the cabinet, improving the overall aesthetics.

[0466] It should be pointed out that the lifting device of this embodiment can be applied to range hoods of other embodiments besides this embodiment.

[0467] Embodiment ten:

[0468] like Figure 81-Figure 98 A preferred embodiment of the range hood of this embodiment is shown. The range hood comprises a body, a fan system 40 arranged in the body, and a driving device.

[0469] See also Fig.81 and Fig.84The body includes a first shell 11, a second shell 12 and an air inlet cavity 13. The inner cavity of the first shell 11, the inner cavity of the second shell 12 and the inner cavity of the air inlet cavity 13 are connected. The first shell 11, the second shell 12 and the air inlet cavity 13 are relatively lifted and lowered by the above-mentioned driving device to ensure that the air inlet cavity 13 can be lowered to a position closer to the smoke source to improve the oil fume absorption effect. Specifically, the first shell 11 is fixed relative to the wall, and the fan system 40 is arranged in the first shell 11 to provide negative pressure for sucking and exhausting oil fume. The first shell 11 and the second shell 12 are arranged inside and outside and can move up and down relative to each other, and the air inlet cavity 13 and the second shell 12 are arranged inside and outside and can move up and down relative to each other. The left and right dimensions of the first shell 11 are smaller than the left and right dimensions of the second shell 12, and the front and rear dimensions of the first shell 11 are basically the same as the front and rear dimensions of the second shell 12 (specifically, the front and rear dimensions of the first shell 11 are slightly smaller than the front and rear dimensions of the second shell 12). The left-right dimensions of the air inlet cavity 13 are substantially consistent with the left-right dimensions of the second shell 12 (specifically, the left-right dimensions of the air inlet cavity 13 are slightly smaller than the left-right dimensions of the second shell 12), while the front-to-back dimensions of the air inlet cavity 13 are smaller than the front-to-back dimensions of the second shell 12, and are substantially about one-third of the front-to-back dimensions of the second shell 12. More specifically, the top of the second shell 12 has a first opening 121 for the first shell 11 to enter and exit the second shell 12 in the up-down direction, and the shape and size of the first opening 121 are substantially consistent with the shape and size of the cross section (cross section in the horizontal direction) of the first shell 11. The bottom of the second shell 12 has a second opening 122 for the air inlet cavity 13 to enter and exit the second shell 12 in the up-down direction. The shape and size of the second opening 122 are substantially consistent with the shape and size of the cross section (cross section in the horizontal direction) of the air inlet cavity 13. The second opening 122 is arranged at the rear side of the bottom of the second shell 12, so the air inlet cavity 13 is also arranged at the rear relative to the second shell 12, and thus, the bottom area of ​​the second shell 12 located at the part of the air inlet cavity 13 forms a smoke shielding portion 123 for collecting smoke. An air inlet 131 for external smoke to enter is provided on the front side wall of the air inlet cavity 13, and specifically, the air inlet 131 extends in the left and right directions. An oil cup 132 extending left and right is provided at the bottom of the air inlet cavity 13, which is used to receive the oil flowing down from the air inlet cavity 13.

[0470] like Fig.87 As shown, in order to better carry out the wall installation and to ensure the overall stability of the range hood, the rear side wall of the air inlet cavity 13 and the rear side wall of the first shell 11 are both arranged close to the rear side wall of the second shell 12, that is, the rear side wall of the air inlet cavity 13, the rear side wall of the first shell 11 and the rear side wall of the second shell 12 are basically located in the same vertical extension direction.

[0471] Combination Fig.81 and Fig.84When the range hood is folded (generally when it is turned off), the air inlet cavity 13 moves from bottom to top through the second opening 122 at the bottom of the second shell 12 and enters the inner cavity of the second shell 12. After moving into position, the air inlet 131 on the air inlet cavity 13 is blocked by the second shell 12 and closed, and the bottom of the air inlet cavity 13 (that is, the bottom wall of the oil cup 132) is basically flush with the bottom wall of the second shell 12. Similarly, when the second shell 12 moves upward relative to the first shell 11, the first shell 11 enters the inner cavity of the second shell 12 from the first opening 121 at the top of the second shell 12. After moving into position, most of the first shell 11 (the lower part) is accommodated in the second shell 12, while the upper part is exposed relative to the second shell 12, so as to be used for installing the fixing frame and hanging it on the wall. When the second shell 12 and the air inlet cavity 13 rise to the designated position at the same time, they can be flush with the bottom surface of the cabinet, that is, the whole can be hidden in the cabinet, improving the overall aesthetics. When the range hood is extended, the second shell 12 and the air inlet cavity 13 arranged on the second shell 12 move downward relative to the first shell 11. At the same time, the air inlet cavity 13 moves downward relative to the second shell 12, exposing the bottom of the second shell 12 and exposing the air inlet 131. After the second shell 12 and the air inlet cavity 13 move into place, the height position of the second shell 12 is lower than the height position of the first shell 11, and the height position of the air inlet cavity 13 is lower than the height position of the second shell 12. Since the range hood relies on the large stroke of the two-stage drive to make the air inlet 131 of the air inlet cavity 13 move downward more, the range hood can effectively improve the oil fume extraction effect.

[0472] See also Figure 88-Figure 92 The driving device of this embodiment includes a driving member 21 and a transmission assembly. The driving member 21 adopts a driving motor, and the transmission assembly adopts a two-stage screw transmission assembly. Specifically, the transmission assembly includes a fixed arm 24, a movable arm 25, a first screw rod 22 and a second screw rod 23.

[0473] See also Fig.94 In this embodiment, the driving member 21 preferably adopts a driving motor arranged on the top plate of the first housing 11. The driving motor is installed on the top plate of the first housing 11 through a vibration damping seat 210. The vibration damping seat 210 adopts a rubber sleeve that is sleeved around the periphery of the main body of the driving motor, wherein the area on the rubber sleeve that contacts the first housing 11 is set as a grid-like structure, thereby effectively preventing the vibration generated by the driving motor from being directly transmitted to the first housing 11, especially through the deformation and energy absorption of the fine grid, isolating the transmission of the high-frequency vibration of the motor.

[0474] The rear side wall of the first housing 11 is provided with a mounting groove 110 that is recessed backward and extends vertically, wherein the transmission assembly as a whole also extends vertically, is arranged in the above-mentioned mounting groove 110, and is vertically opposite to the driving motor arranged on the top plate of the first housing 11. The transmission assembly is arranged in the mounting groove 110 that is recessed backward in the first housing 11, so that the rear part of the first housing 11 can be better attached to the wall, thereby ensuring the reliability of the installation of the range hood.

[0475] The fixed arm 24 is rod-shaped as a whole, and defines an accommodating chamber 241 inside. The fixed arm 24 is provided with a first mounting opening 242 that penetrates from the outside to its accommodating chamber 241 at the end adjacent to the driving member 21, and a first nut 243 fixed relative to the fixed arm 24 is provided at the first mounting opening 242. The fixed arm 24 is provided with an opening at the end away from the driving member 21, and the movable arm 25 can enter and exit the accommodating chamber 241 of the fixed arm 24 through the opening. The fixed arm 24 is also provided with a hook assembly for connecting to the rear side wall of the second housing 12 at the end position adjacent to the driving member 21, and the specific structure of the hook assembly is described below.

[0476] The upper end of the first screw rod 22 is transmission-connected to the power output end of the driving motor, and the lower end is threadedly connected to the first nut 243 at the end of the fixed arm 24. The first screw rod 22 can rotate around its own axis under the drive of the driving motor. When the first screw rod 22 rotates around its own axis, since the fixed arm 24 is fixed relative to the second housing 12, the fixed arm 24 (and the second housing 12) can be driven to move linearly in the up and down directions relative to the first screw rod 22. During the upward movement of the fixed arm 24, the first screw rod 22 gradually extends into the accommodating chamber 241 of the fixed arm 24.

[0477] The second screw rod 23 is rotatably disposed in the accommodating chamber 241 of the fixed arm 24, and its axial length is substantially consistent with the length of the fixed arm 24. Specifically, the upper end of the second screw rod 23 adjacent to the driving motor is rotatably mounted at the upper end position of the fixed arm 24 through a bearing 245, and the lower end of the second screw rod 23 away from the driving motor is disposed in the yield chamber 251 of the movable arm 25 through a corresponding support sleeve 246. Among them, the support sleeve 246 can slide in contact with the inner wall of the yield chamber 251 of the movable arm 25 in the axial direction, thereby ensuring the stability of the rotation of the second screw rod 23 during the upward and downward movement of the movable arm 25 relative to the fixed arm 24, and avoiding the shaking problem. The second screw rod 23 of this embodiment is axially hollow to form an installation channel 231 for the first screw rod 22 to extend into. The mounting channel 231 of the second screw rod 23 is provided with a limiting groove 232 extending along its axial direction. Correspondingly, the first screw rod 22 is provided with a limiting portion 221 at the end position (i.e., the lower end) away from the driving motor. Specifically, the lower end position of the first screw rod 22 is provided with a spline as the above-mentioned limiting portion 221. The spline component can be sleeved on the end of the first screw rod 22 and limited by the corresponding screws and limiting washers. The mounting channel 231 of the second screw rod 23 has an axially extending spline groove as the above-mentioned limiting groove 232. When the first screw rod 22 rotates, the first screw rod 22 and the second screw rod 23 cooperate with each other through the above-mentioned spline and spline groove, so that the first screw rod 22 and the second screw rod 23 can rotate synchronously and slide relative to each other in the axial direction.

[0478] The movable arm 25 of this embodiment has a contracted state in which it is retracted into the accommodating chamber 241 of the fixed arm 24 from the extended state relative to the fixed arm 24. The movable arm 25 is axially hollow to form a clearance chamber 251 for the second screw rod 23 to extend into. The movable arm 25 has a first end (i.e., an upper end) located in the accommodating chamber 241 of the fixed arm 24 and a second end (i.e., a lower end) extending out of the accommodating chamber 241 of the fixed arm 24, wherein the second end of the movable arm 25 is provided with a connector 253 for connecting to the top of the rear side wall of the air inlet cavity 13, the connector 253 has a socket 2530, and is coated with a second vibration reduction layer 2531 made of rubber material (the second vibration reduction layer 2531 is also provided in the socket 2530), and the air inlet cavity 13 is provided with a connecting frame 130 for connecting to the connector 253, the connecting frame 130 also has a socket, and the connector 253 and the connecting frame 130 can be connected by a pin inserted through the sockets of the two. The above-mentioned connector 253, the second vibration reduction layer 2531 and the connecting frame 130 together constitute a buffer vibration reduction structure.

[0479] The first end (i.e., the upper end) of the movable arm 25 is provided with a second mounting opening that is interlinked with the yielding chamber 251, and the second mounting opening is provided with a second nut 252 fixed relative to the movable arm 25. The second screw 23 is threadedly connected with the second nut 252 on the movable arm 25. When the second screw 23 rotates, the movable arm 25 can be driven to move axially relative to the fixed arm 24. When the movable arm 25 is retracted into the accommodating chamber 241 of the fixed wall and reaches the limit position, most of the second screw 23 also extends into the yielding chamber 251 of the movable arm 25, thereby making the volume of the screw transmission assembly more compact. On the other hand, the fixed arm 24 and the movable arm 25 of this embodiment are both sleeve parts with non-circular cross sections. Specifically, the cross sections of the fixed arm 24 and the movable arm 25 are both square. In this way, the movable arm 25 and the fixed arm 24 can be limited in the circumferential direction. When the second screw 23 rotates, the movable arm 25 can only slide linearly relative to the fixed arm 24, thereby ensuring the stability of the telescopic action of the movable arm 25.

[0480] The above-mentioned first screw rod 22 (the upper end thereof) constitutes the power input end of the transmission assembly of this embodiment, the upper end of the fixed arm 24 (connected to the second shell 12) constitutes the first power output end of the transmission assembly, and the second end of the movable arm 25 (connected to the air inlet cavity 13) constitutes the second power output end of the transmission assembly.

[0481] Considering that in actual situations, the distance that the second shell 12 moves up and down relative to the first shell 11 is not consistent with the distance that the air inlet cavity 13 moves relative to the second shell 12, in order to achieve that the second shell 12 and the air inlet cavity 13 can move synchronously to the position when rising or falling, the pitch of the first screw rod 22 of this embodiment is different from the pitch of the second screw rod 23, and the thread rotation direction of the first screw rod 22 is the same as the thread rotation direction of the second screw rod 23. In this way, when the drive motor rotates in the forward direction, the second shell 12 moves downward relative to the first shell 11, and the air inlet cavity 13 also moves downward relative to the second shell 12 at the same time, and when the drive motor stops rotating, both move downward to the set position. This two-stage lifting method has a designable motion stroke ratio, which can achieve a larger motion stroke, making the lifting and adjusting process of the range hood more efficient. Specifically, the pitch of the first screw rod 22 and the pitch of the second screw rod 23 can be reasonably selected according to the actual lifting distance of the second shell 12 and the air inlet cavity 13. In this embodiment, a control sensor may also be provided to enable the air inlet cavity 13 to hover at any position, thereby meeting the requirements of more usage scenarios.

[0482] Taking into account that the stroke of the driving device (specifically the transmission component) is relatively large, the swing of the first screw rod is a factor that cannot be ignored. Tests show that, under the existing screw rod processing straightness level, the swing amplitude of the screw rod end with a stroke of 240mm can reach 1mm. In order to better suppress the swing problem of the first screw rod 22 and to better connect it to the drive motor transmission, the first screw rod 22 extends from one end adjacent to the drive motor to the position of the top plate of the first shell 11, and is connected to the top plate of the first shell 11 through a mounting seat 27. Specifically, a bearing 271 for the first screw rod 22 to pass through is provided inside the mounting seat 27.

[0483] A vibration-isolating pad 270 is provided between the mounting seat 27 and the first shell 11 for vibration isolation. Specifically, the vibration-isolating pad 270 can be made of nitrile rubber with a thickness of about 4 mm. The whole is fixed with step screws. The step screws used to fix the mounting seat 27 are not in direct contact, and the gap between the mounting screws is also filled with nitrile rubber.

[0484] The output shaft of the driving motor of this embodiment is connected to the first screw 22 through a worm gear transmission mechanism 26. The worm (not shown) of the worm gear transmission mechanism 26 is connected to the output shaft of the driving motor, and the center of the worm wheel (plastic parts can be used) is connected to the hexagonal hole at the top of the first screw 22 to transmit power, thereby avoiding the rigid connection of the screw and the interference of the positioning of the worm gear, effectively reducing the vibration transmission and the abnormal sound of the motor, blocking the transmission of vibration, and eliminating process deviation.

[0485] See also Figure 94-Figure 98 The end of the fixed arm 24 of the driving device is connected to the rear side wall of the second housing 12 through a hook assembly, so as to achieve the purpose of quick disassembly and assembly. Specifically, the hook assembly includes a fixing seat 5 and a hook body 6, and the fixing seat 5 is arranged at the upper end of the fixed arm 24. The hook body 6 can be installed on the rear side wall of the second housing 12 by screws.

[0486] The fixing seat 5 of this embodiment is inserted into the port at the upper end of the fixing arm 24, and defines a through hole for the first screw rod 22 to pass through, and the through hole is the above-mentioned first installation port 242. Specifically, the fixing seat 5 can be a half-seat structure spliced ​​together, and the first nut 243 can be fixed by splicing the two half-seat structures together and restricting its rotation in the circumferential direction.

[0487] The left and right sides of the fixing seat 5 define a limiting channel 50 that passes through from front to back, wherein the limiting channel 50 is open at the side. Specifically, the left and right sides of the fixing seat 5 are provided with a first stop edge 51 and a second stop edge 52 that extend from front to back and are opposite to each other in the up-down direction, and the gap between the first stop edge 51 and the second stop edge 52 is the above-mentioned limiting channel 50. More specifically, the first stop edge 51 is located at the top, and the second stop edge 52 is located at the bottom. The front-to-back extension length of the second stop edge 52 is consistent with the extension length of the fixing seat 5 as a whole in the front-to-back direction, and the extension length of the first stop edge 51 in the front-to-back direction is less than the extension length of the second stop edge 52 in the front-to-back direction. Therefore, a gap is formed at the front and rear ports of the limiting channel 50, thereby facilitating the installation of the hook body 6 and limiting the position of the hook portion 623 of the hook body 6 after installation.

[0488] The hook body 6 includes a mounting plate 61 for connecting to an external component to be installed and a hanging portion 62 extending vertically relative to the mounting plate 61. Specifically, it is adapted to the left and right limiting channels 50 of the above-mentioned fixed seat 5. The hook body 6 has two hanging portions 62 that are opposite to each other on the left and right and spaced a certain distance apart. The spacing between the two hanging portions 62 is adapted to the left and right dimensions of the fixed seat 5 (excluding the first stop edge 51 and the second stop edge 52).

[0489] The hanging portion 62 of the hook body 6 is bent at the end away from the mounting plate 61 to form a hook portion 623 that extends obliquely relative to the main body of the hanging portion 62 (specifically, extends obliquely upward toward the side away from the mounting plate 61). The hanging portion 62 of the hook body 6 includes a horizontally arranged extension wall 621 and a vertically arranged support plate 622 connected to the extension wall 621, that is, the extension wall 621 and the support plate 622 are substantially perpendicular, and the hook portion 623 is correspondingly arranged at the end position of the extension wall 621. A reinforcing rib 63 is provided at the position where the hanging portion 62 is connected to the mounting plate 61. The reinforcing rib 63 is a triangular plate structure that extends upward or downward from the upper and lower bottom surfaces of the extension wall 621 of the hanging portion 62 and connects to the mounting plate 61.

[0490] When the hook body 6 is installed, the position of the hook portion 623 of the hook body 6 is depressed and the position of the mounting plate 61 is raised, so that it is in an inclined state, so that the extension wall 621 of the hook body 6 can smoothly extend into the limiting channel 50 of the fixing seat 5. After being installed in place, the hook body 6 can be adjusted to a flat state. In this state, the hook portion 623 of the hook body 6 is correspondingly limited at the upper edge 510 (i.e., the rear end of the first stop edge 51) at the rear end of the limiting channel 50, thereby limiting the hanging portion 62 from withdrawing from the limiting channel 50. At the same time, the reinforcing rib 63 of the hook body 6 also abuts against the front of the fixing seat 5, so that the hook body 6 and the fixing seat 5 are firmly limited in the front and rear directions. On the other hand, after the hook body 6 is installed in place, the support plate 622 of the hanging portion 62 also corresponds to the side opening of the limiting channel 50 of the fixing seat 5, further ensuring the reliability of the installation of the two.

[0491] The hook holding part 62 of the hook body 6 includes a base 624 with a metal frame as the main body and a first vibration reduction layer 625 wrapped outside the base 624. Specifically, the extension wall 621 and the support plate 622 of the hook body 6 can be made of aluminum alloy. Of course, the mounting plate 61 and the reinforcing rib 63 can also be made of aluminum alloy. The above components are integrally formed. The first vibration reduction layer 625 is a rubber part, which is wrapped outside the extension wall 621, the support plate 622 and the reinforcing rib 63.

[0492] When the hook body 6 of the hook assembly and the fixing seat 5 are being installed, the hook body 6 can be slightly tilted at a certain angle so that the hanging portion 62 is installed in the limiting channel 50 of the fixing seat 5, and then laid flat and straightened (that is, the natural installation posture of the mounting plate 61 of the hook body 6). In this state, the hook portion 623 of the hook body 6 abuts against the fixing seat 5, thereby limiting the hanging portion 62 from withdrawing from the limiting channel 50, achieving the purpose of effective anti-slip. Similarly, after releasing the fixed connection between the hook body 6 and the component to be installed, the hook body 6 can be tilted at a certain angle to be removed from the limiting channel 50 of the fixing seat 5. The above hook assembly is easy to disassemble and assemble, and easy to operate, which improves the installation efficiency. In the preferred embodiment, the first vibration reduction layer 625 on the hanging portion 62 of the hook body 6 has a good vibration reduction effect and reduces the transmission to the body.

[0493] The first housing 11 and the second housing 12 of this embodiment are also slidably connected by the first guide rail pair 31, wherein there are two groups of the first guide rail pair 31, which are respectively arranged on the left and right sides of the driving device, specifically at the left and right corners of the rear part of the first housing 11. Specifically, each group of the first guide rail pair 31 extends vertically as a whole, and specifically includes a first guide rail portion 311 and a second guide rail portion 312 which are perpendicular to each other, the first guide rail portion 311 is connected to the rear side wall of the first housing 11, and the second guide rail portion 312 is connected to the left side wall or the right side wall of the first housing 11. Since the left and right groups of the first guide rail pair 31 both adopt a mutually perpendicular guide rail pair structure, the shaking of the whole machine in the front-back and left-right directions can be well limited, and the stability of the range hood lifting process can be further improved.

[0494] The second housing 12 is slidably connected to the air inlet cavity 13 via the second guide rail pair 32. In this embodiment, there are also two sets of second guide rail pairs 32, both of which extend vertically. The two sets of second guide rail pairs 32 are also arranged on the left and right sides of the drive device, specifically on the left and right side positions of the air inlet cavity 13.

[0495] The lifting process of the range hood of this embodiment is as follows:

[0496] When the range hood is turned on and the drive motor is activated, the first screw rod 22 and the second screw rod 23 (due to the axially slidable spline matching) rotate in the same direction and slide axially relative to each other, wherein the first screw rod 22 and the first nut 243 of the fixed arm 24 are in transmission matching, driving the fixed arm 24 to move downward, that is, the second housing 12 (and the air inlet cavity 13 provided on the second housing 12) move downward relative to the first housing 11, and at the same time, since the second screw rod 23 and the second nut 252 on the movable arm 25 are also in transmission matching, the movable arm 25 extends downward relative to the fixed arm 24, that is, the air inlet cavity 13 moves downward relative to the second housing 12, exposing the bottom of the second housing 12, and exposing the air inlet 131 on the front side wall. After the second housing 12 and the air inlet cavity 13 are moved into place, the height position of the second housing 12 is lower than the height position of the first housing 11, and the height position of the air inlet cavity 13 is lower than the height position of the second housing 12. Since the range hood relies on the large stroke of the two-stage drive to make the air inlet 131 of the air inlet cavity 13 go down more, the oil fume extraction effect can be effectively improved. When the range hood is folded (generally when it is turned off), the drive motor rotates in the opposite direction, and the air inlet cavity 13 moves from bottom to top through the second opening 122 at the bottom of the second shell 12 to enter the inner cavity of the second shell 12, and after moving to the right position, the air inlet 131 on the air inlet cavity 13 is blocked by the second shell 12 and closed, and the bottom of the air inlet cavity 13 (that is, the bottom wall of the oil cup 132) is basically flush with the bottom wall of the second shell 12. In this process, the second shell 12 moves upward relative to the first shell 11, that is, the first shell 11 enters the inner cavity of the second shell 12 from the first opening 121 at the top of the second shell 12, and after moving to the right position, most of the first shell 11 (the lower part) is accommodated in the second shell 12, and the upper part is exposed relative to the second shell 12, so as to be used to install the fixing frame and hang it on the wall. When the second shell 12 and the air inlet cavity 13 rise to the designated position at the same time, they can be flush with the bottom surface of the cabinet, that is, the whole can be hidden in the cabinet, improving the overall aesthetics.

[0497] It should be pointed out that the driving device of this embodiment can be applied to range hoods of other embodiments besides this embodiment.

[0498] Embodiment eleven:

[0499] like Figure 99-106 , shows a preferred embodiment of the range hood of this embodiment, the range hood includes a body, a fan system 40 arranged in the body, and a lifting device 20.

[0500] See also Fig.99 and Fig.102The machine body includes a casing and an air inlet cavity 13 connected to the casing, and the casing includes a first shell 11 and a second shell 12. The inner cavity of the first shell 11, the inner cavity of the second shell 12 and the inner cavity of the air inlet cavity 13 are all connected. The first shell 11, the second shell 12 and the air inlet cavity 13 are relatively lifted and moved by the above-mentioned lifting device 20 to ensure that the air inlet cavity 13 can be lowered to a position closer to the smoke source to improve the oil fume absorption effect. The first shell 11 is fixed relative to the wall, and the fan system 40 is arranged in the first shell 11 to provide negative pressure for sucking and exhausting oil fume. The first shell 11 and the second shell 12 are arranged inside and outside and can move up and down relatively, and the air inlet cavity 13 and the second shell 12 are arranged inside and outside and can move up and down relatively. The left and right dimensions of the first shell 11 are smaller than the left and right dimensions of the second shell 12, and the front and rear dimensions of the first shell 11 are basically the same as the front and rear dimensions of the second shell 12 (specifically, the front and rear dimensions of the first shell 11 are slightly smaller than the front and rear dimensions of the second shell 12). The left-right dimensions of the air inlet cavity 13 are substantially consistent with the left-right dimensions of the second shell 12 (specifically, the left-right dimensions of the air inlet cavity 13 are slightly smaller than the left-right dimensions of the second shell 12), while the front-to-back dimensions of the air inlet cavity 13 are smaller than the front-to-back dimensions of the second shell 12, and are substantially about one-third of the front-to-back dimensions of the second shell 12. More specifically, the bottom of the first shell 11 has a first opening 111, the top of the second shell 12 is provided with a second opening 121, and the bottom rear side of the second shell 12 is provided with a third opening 122. The first opening 111 of the first shell 11 is opposite to the second opening of the second shell 12 in the up-down direction. The first shell 11 can extend downward into the second shell 12 through the second opening 121 for entering and exiting the second shell 12, wherein the shape and size of the second opening 121 of the second shell 12 are substantially consistent with the shape and size of the cross section (cross section in the horizontal direction) of the first shell 11. The air inlet cavity 13 can extend into the second shell 12 in the up and down directions through the third opening 122 at the bottom of the second shell 12, wherein the shape and size of the third opening 122 are substantially consistent with the shape and size of the cross section (cross section in the horizontal direction) of the air inlet cavity 13. Since the third opening 122 is disposed at the rear side of the bottom of the second shell 12, the air inlet cavity 13 is also disposed relatively rearwardly relative to the second shell 12, thereby, the bottom area of ​​the second shell 12 located at the part of the air inlet cavity 13 forms a smoke barrier 123 for collecting smoke. An air inlet 131 is provided on the front side wall of the air inlet cavity 13 for external smoke to enter therein, and specifically, the air inlet 131 extends in the left and right directions. An oil cup 132 extending left and right is provided at the bottom of the main body of the air inlet cavity 13 for holding the oil flowing down from the main body of the air inlet cavity 13.

[0501] like Fig.103As shown, in order to better carry out the wall installation and to ensure the overall stability of the range hood, the rear side wall of the air inlet cavity 13 and the rear side wall of the first shell 11 are both arranged close to the rear side wall of the second shell 12, that is, the rear side wall of the air inlet cavity 13, the rear side wall of the first shell 11 and the rear side wall of the second shell 12 are basically located in the same vertical extension direction.

[0502] Combination Fig.99 and Fig.102 When the range hood is folded (generally when it is turned off), the air inlet cavity 13 moves from bottom to top through the third opening 122 at the bottom of the second shell 12 and enters the inner cavity of the second shell 12. After moving into position, the air inlet 131 on the air inlet cavity 13 is blocked by the second shell 12 and closed, and the bottom of the air inlet cavity 13 (that is, the bottom wall of the oil cup 132) is basically flush with the bottom wall of the second shell 12. Similarly, when the second shell 12 moves upward relative to the first shell 11, the first shell 11 enters the inner cavity of the second shell 12 from the second opening 121 at the top of the second shell 12. After moving into position, most of the first shell 11 (the lower part) is accommodated in the second shell 12, while the upper part is exposed relative to the second shell 12, so as to be used for installing the fixing frame and hanging it on the wall. When the second shell 12 and the air inlet cavity 13 rise to the designated position at the same time, they can be flush with the bottom surface of the cabinet, that is, the whole can be hidden in the cabinet, improving the overall aesthetics. When the range hood is extended, the second shell 12 and the air inlet cavity 13 arranged on the second shell 12 move downward relative to the first shell 11. At the same time, the air inlet cavity 13 moves downward relative to the second shell 12, exposing the bottom of the second shell 12 and exposing the air inlet 131. After the second shell 12 and the air inlet cavity 13 move into place, the height position of the second shell 12 is lower than the height position of the first shell 11, and the height position of the air inlet cavity 13 is lower than the height position of the second shell 12. Since the range hood relies on the large stroke of the two-stage drive to make the air inlet 131 of the air inlet cavity 13 move downward more, the range hood can effectively improve the oil fume extraction effect.

[0503] like Fig.101 and Fig.103As shown, in order to realize the lifting and lowering of the second shell 12 relative to the first shell 11 and the lifting and lowering of the air inlet cavity 13 relative to the second shell 12, the lifting device 20 of this embodiment can be realized by two independent lifting mechanisms (such as electric push rods), or by a lifting mechanism with a two-stage telescopic function in the prior art. Such a lifting mechanism generally has two power output ends, one of which 21 can be connected to the second shell 12 to drive the second shell 12 to lift and lower relative to the first shell 11, and the other power output end 22 can be connected to the air inlet cavity 13 to drive the air inlet cavity 13 to lift and lower relative to the second shell 12. There is a movement gap between the first shell 11 and the second shell 12, and a sealing member 30 is provided at the movement gap, wherein the sealing member 30 can be fixed on the first shell 11, and the sealing member 30 is in sealing contact with the second shell 12 during the up and down movement of the first shell 11.

[0504] See also Fig.106 In this embodiment, the air inlet cavity 13 includes a first side wall 1301 and a second side wall 1302 opposite to each other in the left-right direction, a third side wall 1303 located at the rear side, a fourth side wall 1304 located at the bottom, and a support plate 134 connected between the front side of the first side wall 1301 and the front side of the second side wall 1302. The open area between the support plate 134 and the fourth side wall 1304 at the bottom of the air inlet cavity 13 constitutes the air inlet 131 of the air inlet cavity 13, and the air inlet 131 is arranged to extend in the left-right direction. The design of the support plate 134 ensures the structural strength of the entire air inlet 131 area. In the absence of the support plate 134, the air inlet 131 box body is a structure with an open front end face, and the structural strength of the entire air inlet 131 box body is far from enough. After adding the support plate 134, the air inlet 131 box body is surrounded by a structure with four closed end faces, and the structural strength is greatly improved.

[0505] Inside the air inlet cavity 13, at the lower edge adjacent to the air inlet 131 (i.e., at the fourth side wall 1304 at the bottom of the air inlet cavity 13), a guide plate 133 tilted upward from front to back is provided. In order to achieve a better guide effect at the air inlet 131, the angle formed between the guide plate 133 and the horizontal plane is recorded as α, wherein the value range of α is: 15°≤α<90°. The above-mentioned inclined arrangement of the guide plate 133 enables the guide plate 133 to have a certain shielding effect on the front, which can ensure the aesthetics of the air inlet 131, and the appearance of the guide plate 133 is relatively smooth, without redundant protruding features, ensuring the easy cleanliness of the air inlet 131.

[0506] The lower edge of the guide plate 133 of this embodiment has a first flange 1331 extending horizontally backward, and the first flange 1331 can be connected to the fourth side wall 1304 of the air inlet cavity 13 by screws. The upper edge of the guide plate 133 extends to the third side wall 1303 at the rear side of the air inlet cavity 13. In order to prevent the guide plate 133 from shaking under the influence of airflow, a corresponding shelf 14 is provided at the third side wall 1303 of the air inlet cavity 13. When the guide plate 133 is installed, the upper edge of the guide plate 133 can be placed on the shelf 14. More specifically, two or more shelves 14 may be sequentially arranged on the rear side wall of the air inlet cavity 13 along the left-right direction, wherein each shelf 14 has a slot 141 with a top opening, and a hook 142 protruding forward is arranged at the top opening of the slot 141. Correspondingly, the upper edge portion of the guide plate 133 also has a folded edge 1332 folded and extended toward the rear and lower side, and a bayonet 13320 is arranged on the folded edge 1332. In the process of inserting the folded edge 1332 of the guide plate 133 into the slot 141 of the shelf 14, the hook 142 on the shelf 14 may be correspondingly engaged with the bayonet 13320 of the folded edge 1332, thereby limiting the upward movement of the guide plate 133 and realizing a secure fixation of the guide plate 133.

[0507] Continue to see Fig.106 The bottom of the main body of the air inlet cavity 13 (i.e., the fourth side wall 1304) is also provided with an oil leakage hole 130, and the oil leakage holes 130 are arranged in a row, specifically arranged in sequence along the left-right direction. The opening position of the row of oil leakage holes 130 on the fourth side wall 1304 corresponds to the area located in front of the guide plate 133, preferably opposite to the support plate 134 of the air inlet cavity 13 in the up-down direction.

[0508] The lower edge of the support plate 134 of the air inlet cavity 13 has a second flange 1341 folded inwardly of the air inlet cavity 13 and extending upwardly, and an oil guide groove 1340 extending in the left-right direction is defined between the second flange 1341 and the corresponding part of the main body of the support plate 134. The oil collected on the air inlet cavity 13 can fall along the wall surface to the oil guide groove 1340 of the support plate 134, flow to the left and right ends of the oil guide groove 1340, and then drip from the left and right sides of the support plate 134 into the oil cup 132.

[0509] like Fig.104As shown, when the air inlet chamber is in the state of being moved down to a low position, the height position of the upper edge of the air inlet 131 (that is, the lower edge of the support plate 134) is lower than the height position of the smoke barrier 123 of the housing. Specifically, the vertical distance between the upper edge of the air inlet 131 and the smoke barrier 123 of the housing is recorded as X, where the value range of X is: 5mm-50mm, and the preferred value is 18mm. With such a design, the air inlet 131 of the air inlet cavity 13 can be moved as low as possible to the smoke source, and the effective ventilation area of ​​the air inlet 131 can be ensured to be within a suitable design range, thereby ensuring the oil fume absorption effect. On the other hand, the support plate 134 can lower the height of the air inlet 131, so that the oil fume is sucked in when it is still at a certain distance from the bottom of the second housing 12. On the one hand, it can reduce the condensed oil generated by the bottom of the second housing 12 due to contact with the oil fume, and on the other hand, it can also reduce the leakage of oil fume.

[0510] The distance between the upper edge of the air inlet 131 of this embodiment and the guide plate 133 is recorded as d, where the value range of d is: 30mm-300mm. The left and right dimensions of the double-burner gas stoves currently on the market range from 700mm to 900mm. The left and right dimensions of the range hood are slightly larger than those of the gas stove. Correspondingly, the left and right dimensions (length) of the air inlet 131 are also basically the same, and the left and right dimensions (length) of the air inlet 131 can be recorded as L. When the power of the fan system 40 is stable and unchanged, the larger the effective ventilation area at the air inlet 131, the smaller the flow rate; the smaller the effective ventilation area, the greater the flow rate. In order to suck all the oil smoke generated during cooking into the smoke inlet chamber, it is necessary to ensure that the effective ventilation area of ​​the air inlet 131 is not too small, otherwise the range hood will not have time to suck all the oil smoke into it during the time it rises. The effective ventilation area of ​​the air inlet 131 cannot be too large. When the area is too large, the inlet flow rate becomes smaller, the suction force is too small, and there is not enough attraction to suck the generated oil smoke into the range hood. In order to better balance the above two situations, when the length dimension of the air inlet 131 of the range hood (that is, the dimension in the left and right direction) is constant, the distance d between the upper edge of the air inlet 131 and the guide plate 133 is an important factor affecting the effective ventilation area of ​​the air inlet 131. In addition, the effective ventilation area at the air inlet 131 of the smoke inlet chamber of this embodiment is recorded as S, where S=L*d. In order to adapt to the existing fan system 40 and ensure the oil smoke suction effect, the preferred range of the effective ventilation area S is: 30000mm2<S<100000mm2. On this basis, the d value is further reasonably designed, and the value range of d is preferably: 70mm-200mm.

[0511] Since the height position of the upper edge of the air inlet 131 on the air inlet cavity 13 is lower than the height position of the smoke shield 123 of the casing, and the distance between the upper edge of the air inlet 131 and the inclined guide plate 133 is set within the range of 30mm-300mm, the air inlet 131 of the air inlet cavity 13 is lowered as close to the smoke source as possible, thereby ensuring the effective ventilation area at the air inlet 131 of the air inlet cavity 13, so that the rising oil smoke can enter the smoke inlet chamber more smoothly, thereby reducing the escape of oil smoke and improving the oil smoke absorption effect.

[0512] On the basis of the above embodiments, other embodiments can be obtained by replacing and improving the relevant technical features. For example, the guide plate 133 and the main body of the air inlet cavity 13 can also be designed as an integral whole. For example, the guide plate 133 can also be extended as a part of the main body of the air inlet cavity 13, and corresponding flanges are added on the left and right sides of the guide plate 133 to be fixed to the air inlet cavity 13.

[0513] It should be pointed out that the air inlet structure of this embodiment can be applied to range hoods of other embodiments besides this embodiment.

[0514] Embodiment 12:

[0515] See also Figures 107 to 111 A range hood comprises an upper box body 1, a lower box body 2 and an air inlet body 3, wherein the upper box body 1 is fixed and cannot move, such as being fixed on a wall, and a fan 4 is installed inside the upper box body.

[0516] The lower box body 2 and the air inlet body 3 can respectively move up and down relative to the upper box body 1, and the upper box body 1 and the lower box body 2 are sleeved, and the lower box body 2 and the air inlet body 3 are sleeved. In this embodiment, the lower box body 2 is sleeved on the outer side of the upper box body 1 and the outer side of the air inlet body 3, the lower end of the upper box body 1 extends from the upper end of the lower box body 2 into the lower box body 2, and the upper end of the air inlet body 3 extends from the lower end of the lower box body 2 into the lower box body 2.

[0517] In the overall non-working state, the upper box body 1 and the air inlet body 3 are partially or completely folded into the lower box body 2, so that the whole machine is smaller in size, occupies less kitchen space, and is more beautiful. Fig.115 and Fig.116 . When the whole machine is in working state, the lower box body 2 and the air inlet body 3 descend to a position closer to the smoke source, thereby ensuring the performance requirements of the whole machine. The motion mechanism of the range hood used to drive the lower box body 2 and the air inlet body 3 to rise and fall can refer to the existing two-stage lifting range hood, such as disclosed in the Chinese patent application number 201821783223.X, and can also refer to the Chinese patent application number 202010123977.8 of the applicant, which will not be repeated here.

[0518] The air inlet body 3 includes a main air inlet 31 opened at the front side, and a smoke shield 5 may be provided at the bottom of the lower box body 2. The smoke shield 5 is arranged horizontally in this embodiment and is fixed to the lower box body 2. In the working state, the main air inlet 31 is located below the rear bottom of the smoke shield 5, and the smoke shield 5 can guide the oil smoke into the main air inlet 31. In this embodiment, the air inlet body 3 is flat as a whole (the depth in the front-to-back direction is much smaller than the width in the left-to-right direction), thereby forming an ultra-thin design, which can reduce the occupied space in the working state.

[0519] The width D of the lower box body 2 in the left-right direction is greater than the width d of the upper box body 1, and the lower box body 2 includes a back plate 21, a first side plate 221, a second side plate 222, a first front plate 231 and a second front plate 232, wherein the back plate 21 is close to the installation base of the range hood, such as a wall, and is located at the rear side of the overall structure of the lower box body 2. The first front plate 231 is arranged at intervals on the front side of the back plate 21, and is preferably parallel to the back plate 21. The first side plate 221 has two and is respectively arranged at the left end and the right end of the first front plate 231, and each first side plate 221 extends backward from the corresponding end of the first front plate 231. The second front plate 232 has two, each second front plate 232 corresponds to a first side plate 221, and the second front plate 232 is connected to the rear end of the corresponding first side plate 221, and extends in a direction away from the other first side plate 221. The second side plate 222 has two and is respectively connected to the left end and the right end of the back plate 21. Each second side plate 222 extends forward from the connection with the back plate 21, and the front end of the second side plate 222 on the left side is connected to the left end of the second front plate 232 on the left side, and the front end of the second side plate 222 on the right side is connected to the right end of the second front plate 232 on the right side. The second side plates 222 can extend from the back to the front, or from the back to the front and gradually extend away from each other. The cross section (horizontal cross section) of the lower box body 2 composed of the above-mentioned plates is roughly in the shape of a "convex" character.

[0520] Thus, the space between the back plate 21, the second side plate 222 and the second front plate 232 corresponds to the air inlet body 3, and the air inlet body 3 can be raised and lowered in the space. The fan 4 is arranged in a back suction style, that is, the air inlet of the fan 4 faces the rear side, thereby forming a direct suction and discharge form, which is conducive to the suction and discharge of oil smoke.

[0521] The second front plate 232 and the first front plate 231 may be covered with a panel 24, such as a panel 24 made of glass, to avoid the connection position being exposed, and a control module, a control screen, etc. may also be arranged on the panel 24. The lower box body 2 further includes a top plate 25, which is arranged on the top of the back plate 21, the second side plate 222, and the second front plate 232, and has two top plates, which are respectively located on the left and right sides of the upper box body 1. The smoke shield 5 at least partially closes the lower end portions of the first side plate 221 and the first front plate 231.

[0522] See also Fig.108 , Fig.109 , Figures 111 to 114 In order to strengthen the overall structural strength of the lower box 2, the lower box 2 also includes a connecting plate 26, which has two connecting plates 26, one of which is connected between the left end of the first front plate 231 and the back plate 21, and the other connecting plate 26 is connected between the right end of the first front plate 231 and the back plate 21. The portion of the connecting plate 26 corresponding to the first side plate 221 is located on the side of the first side plate 221 facing the lower box 2. The back plate 21, the connecting plate 26 and the first front plate 231 are wrapped around the outer periphery of the upper box 1, which has good sealing performance and ensures the reliability of the oil circuit of the whole machine, that is, it not only plays the role of sealing the space inside the lower box 2 when the lower box 2 is raised or lowered, but also can guide the oil in the upper box 1 to flow downward when the range hood is working. The first side plate 221 and the connecting plate 26 can be arranged at intervals, so that the wires drawn from the panel 24 can pass through the space between the connecting plates 26 of the first side plate 221 and go upward to avoid being affected by oil smoke.

[0523] Since the space between the back panel 21, the second side panel 222 and the second front panel 23 is used for the lifting and lowering of the air inlet body 3, in order to avoid the interference of the connecting plate 26 on the lifting and lowering of the air inlet body 3, the lower end of the connecting plate 26 is higher than the above-mentioned back panel 21, the second side panel 222 and the second front panel 232, that is, when the air inlet body 3 is in the extreme position stored in the lower box body 2, the lower end of the connecting plate 26 is not lower than the top of the corresponding position of the air inlet body 3 and the connecting plate 26 at this time.

[0524] A partition plate 28 may be disposed between the two second front plates 232 , and the partition plate 28 is located below the connecting plate 26 .

[0525] Thus, in the lower box body 2, a first oil fume channel Q1 adapted to the air inlet body 3 and located below the connecting plate 26, and a second oil fume channel Q2 located above the first oil fume channel Q1 are formed, and the two oil fume channels are fluidly connected, the first oil fume channel Q1 is also fluidly connected to the air inlet body 3, and the second oil fume channel Q2 is also fluidly connected to the upper box body 1. The first oil fume channel Q1 is located between the back plate 21, the second side plate 222, the second front plate 232 and the partition plate 28, and the second oil fume channel Q2 is located between the back plate 21, the connecting plate 26 and the first front plate 231. The rear end of the first oil fume channel Q1 is flush with the rear end of the second oil fume channel Q2 (both are the back plate 21), the front end of the second oil fume channel Q2 exceeds the front end of the first oil fume channel Q1, and the left and right ends of the first oil fume channel Q1 exceed the left and right ends of the second oil fume channel Q2. Therefore, the depth D2 of the second oil fume passage Q2 in the front-to-back direction is greater than the depth D1 of the first oil fume passage Q1 , and the width d1 of the first oil fume passage Q1 in the left-to-right direction is greater than the width d2 of the second oil fume passage Q2 .

[0526] The oil smoke sucked in by the main air inlet 31 of the air inlet body 3 rises upward, and after entering the lower box body 2, before reaching the connecting plate 26, its channel is the same narrow and flat first oil smoke channel Q1 as that in the air inlet body 3. After reaching the connecting plate 26, it enters the second oil smoke channel Q2, which is widened forward relative to the oil smoke channel Q1, and the transition part of the two oil smoke channels presents a sudden expansion. In order to promote the inhalation of oil smoke, an auxiliary air inlet 261 is opened on the connecting plate 26. The auxiliary air inlet 261 is close to the lower end of the connecting plate 26 and is located at the part of the connecting plate 26 corresponding to the first oil smoke channel Q1. Part of the oil smoke enters the second oil smoke channel Q2 directly from the first oil smoke channel Q1, see Fig.109 As shown by the arrow A in the middle, part of the oil smoke located on the left and right sides of the first oil smoke channel Q1 enters the second oil smoke channel Q2 through the auxiliary air inlet 261, see Fig.109 As shown by arrow B.

[0527] Thus, by providing the auxiliary air inlet 261, the structural strength of the connecting plate 26 is ensured, while the entire main air inlet 31 of the whole machine can effectively absorb oil smoke when in operation, thereby improving the overall oil smoke absorption effect. If the auxiliary air inlet 261 is not provided, the space between the connecting plate 26 and the second side plate 222 will serve as an invalid air inlet space.

[0528] A support plate 27 is provided between the second side plate 222 and the connecting plate 26. The support plate 27 is connected to the connecting plate 26 at the upper edge of the auxiliary air inlet 261, and the support plate 27 is also fixed to the back plate 21. In the above-mentioned oil fume absorbing process, the support plate 27 can play a role of guiding the oil fume from the first oil fume channel Q1 to the auxiliary air inlet 261.

[0529] The edge of the connecting plate 26 is provided with a first mounting port 262 for connecting and fixing with an adjacent plate, and the edge of the first side plate 221 is provided with a second mounting interface 2211 for connecting and fixing with an adjacent plate. Optionally, the first mounting interface 262 can be a bent mounting edge, so that fasteners such as screws can pass through the first mounting interface 262 at the rear end of the connecting plate 26 and the back plate 21, thereby fixing the connecting plate 26 and the back plate 21. The first front plate 231 is fixed to the first mounting interface 262 at the front end of the connecting plate 26.

[0530] The first side panel 221 is respectively fixed to the second front panel 232, the connecting plate 26, the first front panel 231 and the smoke baffle 5 through the second mounting interface 2211, and the second mounting interface 2211 can also be a bent mounting edge. During installation, the first side panel 221 and the second front panel 232 can be first fixed to form an assembly, the second front panel 232 is fixed to the second mounting interface 2211 at the rear end of the first side panel 221, and then the second mounting interface 2211 at the top of the assembly is fixed to the first mounting interface 262 at the top of the connecting plate 26, and the smoke baffle 5 is fixed to the second mounting interface 2211 at the lower end of the first side panel 221.

[0531] A panel bracket 241 is disposed at the rear side of the panel 24. There may be two panel brackets 241, which are disposed on the left and right sides of the first front panel 231 respectively. A slot 2212 is provided at the second mounting interface 2211 at the front end of the first side panel 221. The second mounting interface 2211 at the front end of the first side panel 221 is located at the front side of the first front panel 231. A hook 2411 is disposed on the panel bracket 241. The hook 2411 passes through the slot 2212 to achieve preliminary positioning. Then, the panel bracket 241 and the first side panel 221 can be fixed by fasteners such as screws.

[0532] In the specification and claims of the present invention, terms indicating directions, such as "front", "rear", "up", "down", "left", "right", "side", "top", "bottom", etc., are used to describe various exemplary structural parts and elements of the present invention, but these terms are used here only for the purpose of convenience of description and are determined based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed in the present invention can be arranged in different directions, these terms indicating directions are only used as explanations and should not be regarded as limitations. For example, "up" and "down" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

[0533] The "fluid connection" referred to in the present invention refers to the spatial position relationship between two parts or parts (hereinafter collectively referred to as the first part and the second part respectively), that is, the fluid (gas, liquid or a mixture of the two) can flow from the first part along the flow path or / and be transported to the second part. The first part and the second part can be directly connected, or the first part and the second part can be indirectly connected through at least one third party. The third party can be a fluid channel such as a pipe, channel, duct, guide member, hole, groove, etc., or it can be a chamber allowing fluid to flow through, or a combination of the above.

Claims

1. A range hood, comprising an upper housing, a lower housing and an air inlet body, characterized in that: The upper box body is a fixed part, the lower box body is arranged on the upper box body, the air inlet body is arranged on the lower box body, and the lower box body and / or the air inlet body are lifting movable parts.

Images