Range hood

Abstract

An extractor hood comprises a box and an air inlet body, an oil cup is mounted at the bottom of the air inlet body, an upper oil guide component extending from front to back is arranged in the box, an upper air inlet channel is formed above the upper oil guide component, a lower air inlet channel is formed below the rear portion of the upper oil guide component, and the air inlet body ascends and descends in the lower air inlet channel. The projection of the oil guide edge of the upper oil guide part in the vertical direction always falls in the inner cavity of the air inlet body, and oil flowing down from the interior of the box body sequentially flows into the oil cup through the upper oil guide part and the inner cavity of the air inlet body. The lowest oil guide surface of the box body is raised by the upper oil guide part in the box body of the range hood, and the lower air inlet channel formed by the oil guide part downwards provides a containing space for the air inlet body to ascend and descend, so that the air inlet body does ascending and descending motion in the lower air inlet channel; the projection of the oil guide edge of the upper oil guide part in the vertical direction can always fall into the inner cavity of the air inlet body, so that oil flowing down from the interior of the box body sequentially flows into an oil cup through the upper oil guide part and the inner cavity of the air inlet body, and an oil way is prevented from being exposed.

Description

[0001] This application is a divisional application. The application date of the original application is October 26, 2023. The application number of the original application is 202311409227.7. The invention name of the original application is "A Range Hood" Technical Field

[0002] The invention relates to the technical field of range hoods, and in particular to a range hood. Background Art

[0003] Range hoods have become one of the indispensable kitchen appliances in modern families. Range hoods work based on the principle of fluid dynamics. A range hood fan is usually installed inside the housing to absorb and exhaust oil fumes, and use a filter to filter out some grease particles. 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 range 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 range 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. Another example is 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. The first oil guide trough assembly is arranged around the lower inner side of the second air inlet box. The range hood is a lifting range hood, which can realize the downward shift of the negative pressure zone by lowering the first air inlet box to improve the oil fume extraction effect. In addition, by setting up an oil guide structure, the condensed oil from the fixed part of the range hood to the movable part is transferred, 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, so the oil fume extraction effect needs to be improved. Another example is the "Fully Embedded Range Hood" disclosed in the Chinese invention patent application with application number 201810617139.9 (application publication number CN 108644837A). The range hood is equipped with double oil cups. Part of the oil in the smoke collecting chamber is introduced into the oil cup on the fan box, and part of it is introduced into the oil cup of the air inlet body. However, due to the lifting of the air inlet body, when the oil in the smoke collecting chamber is introduced into the oil cup of the air inlet body, it does not pass through the inner cavity of the air inlet body, but is introduced into the outside of the air inlet body, resulting in the oil path being exposed. In addition, the double oil cup solution is cumbersome to operate and the user experience is poor. In summary, further improvements need to be made to the existing lifting range hoods. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a range hood with a pressure stabilizing chamber constructed inside the housing and capable of preventing the oil circuit from being exposed outside the air inlet body in view of the above-mentioned existing technical status.

[0005] The technical solution adopted by the present invention to solve the above technical problems is as follows: the range hood comprises a box body and an air inlet body arranged on the box body, an oil cup is installed at the bottom of the air inlet body, the air inlet body comprises an air inlet main body, the air inlet main body comprises an upper guide plate extending left and right, an air inlet body inner cavity is formed between the upper guide plate and the back plate of the air inlet body, and the characteristic is that an upper oil guide component extending from front to rear is arranged inside the box body, an upper air inlet channel is formed above the upper oil guide component, an opening is formed between the rear edge of the upper oil guide component and the back plate of the box body, the opening extends downward to form a lower air inlet channel, the inner cavity of the box body comprises the upper air inlet channel and the lower air inlet channel, the air inlet body performs a lifting movement in the lower air inlet channel under the drive of the lifting mechanism, and during the lifting process of the air inlet body, the projection of the oil guide edge of the upper oil guide component in the vertical direction always falls in the inner cavity of the air inlet body, and the oil flowing down from the inside of the box body flows into the oil cup through the upper oil guide component and the inner cavity of the air inlet body in turn.

[0006] There may be various positional relationships between the upper oil guide component and the front side of the air inlet body. Preferably, when the air inlet body is raised to the highest position, at least a portion of the upper oil guide component is located above the front side of the air inlet body.

[0007] As another preferred solution, when the air inlet body is raised to the highest position, all of the upper oil guide components are located above the front side of the air inlet body.

[0008] As another preferred embodiment, when the air inlet body rises to the highest position, the highest point of the upper oil guide component is located above the highest point of the front side of the air inlet body, and the rear edge of the upper oil guide component is located below the highest point of the front side of the air inlet body.

[0009] The above-mentioned preferred schemes can all ensure that the oil on the upper oil guide component can flow into the air inlet body after being diverted backwards. When the air inlet body rises to the highest point, the upper oil guide component is located above the air inlet body. Therefore, during the entire lifting process, the oil in the box can be smoothly introduced into the oil cup at the bottom of the air inlet body.

[0010] Further preferably, the upper oil guide component is an upper oil guide plate, and a lower front plate is connected between the rear of the upper oil guide plate and the bottom plate of the box body, and the upper oil guide plate, the lower front plate, the bottom plate of the box body, the front side plate of the box body, the left side plate of the box body, and the right side plate of the box body enclose a sealed cavity isolated from oil smoke. In this way, the lower front plate is connected between the bottom plate of the box body and the upper oil guide plate, which, on the one hand, plays a certain supporting role for the upper oil guide plate, and on the other hand, plays a role in blocking oil smoke, so that the oil inside the range hood will not enter the sealed cavity, and oil accumulation on the lower surface of the upper oil guide plate and the bottom plate of the box body is avoided.

[0011] The lower front plate can have a variety of mounting structures. Preferably, the rear portion of the bottom plate of the box body has an upwardly folded upper flange, the lower portion of the lower front plate is connected and fixed to the upper flange, and the upper portion of the lower front plate is connected and fixed to the rear portion of the upper oil guide plate.

[0012] Preferably, the air inlet body has an air inlet main body, and an air inlet is opened on the front side of the air inlet main body, and the air inlet, the lower air inlet channel and the upper air inlet channel are fluidically connected. In this way, after the oil smoke is sucked from the air inlet of the air inlet body, it passes through the lower air inlet channel and the upper air inlet channel in sequence and then is discharged to the outside.

[0013] In order to allow the oil on the upper oil guide component to flow smoothly into the oil cup through the air inlet body, a lower oil guide plate is installed on the top of the air inlet main body, and an oil guide surface is provided on the lower oil guide plate. The vertical projection of the rear edge of the upper oil guide component falls on the oil guide surface, and the oil falling on the oil guide surface flows into the oil cup.

[0014] The lower oil guide plate can have a variety of structures. Preferably, the lower oil guide plate is a grid plate, and the grid plate has an oil guide channel. The oil guide channel is arranged at the rear side of the oil guide surface, and the oil on the oil guide surface flows into the oil cup through the oil guide channel. In this way, the oil falling on the oil guide surface of the lower oil guide plate can flow smoothly into the oil cup along the oil guide channel.

[0015] In order to allow the oil in the oil guide channel to flow smoothly into the oil cup, the lower oil guide plate is tilted downward from front to back, and an oil leakage hole is opened at the lowest position of the rear part of the oil guide channel, and the projection of the oil leakage hole in the vertical direction falls into the oil cup.

[0016] In order to drive the air inlet body to perform lifting and lowering movements in the lower air inlet channel, the lifting mechanism includes a lifting motor installed on the box body and a transmission assembly installed on the output shaft of the lifting motor. The air inlet body is connected to the transmission assembly. Under the drive of the lifting motor, the air inlet body performs lifting and lowering movements relative to the box body.

[0017] As a preferred embodiment of any of the above schemes, the housing includes an upper housing and a lower housing, the lower housing is wrapped outside the upper housing and can move up and down relative to the upper housing, and the air inlet is contained in the lower housing and can move up and down relative to the lower housing. In this way, the range hood adopts a structure in which the lower housing wraps the upper housing, and the oil on the upper housing can flow smoothly into the upper oil guide component.

[0018] Further preferably, the opening is formed between the rear edge of the upper oil guide component and the back plate of the lower box body, and a lower front plate is connected between the rear portion of the upper oil guide component and the bottom plate of the lower box body.

[0019] Further preferably, a fan is installed in the upper box body, and the fan is located above the upper oil guide component. In this way, when the range hood is working, oil smoke enters the fan through the air inlet body, the lower air inlet channel and the upper air inlet channel, and the oil in the fan flows smoothly onto the upper oil guide component.

[0020] In order to allow all the oil in the air inlet body to flow into the oil cup, the oil cup is in an elongated shape, and the projection of the air inlet main body in the vertical direction falls into the oil cup.

[0021] Compared with the prior art, the advantages of the present invention are: an upper oil guide component is arranged in the range hood case to raise the lowest oil guide surface of the case, and the lower air inlet channel formed downwardly by the oil guide component provides an accommodating space for the lifting and lowering of the air inlet body, so that during the lifting and lowering movement of the air inlet body in the lower air inlet channel, the projection of the oil guide edge of the upper oil guide component in the vertical direction can always fall into the inner cavity of the air inlet body, and then the oil flowing down from the inside of the case flows into the oil cup through the upper oil guide component and the inner cavity of the air inlet body in turn, and the oil path on the air inlet body will not be exposed outside the air inlet body, and the present scheme guides the oil from the case to the air inlet body through a shorter oil guide channel, and the oil is not easy to accumulate in the oil guide channel, so real-time oil guide is realized and the oil guide of the whole machine can be realized through a single oil cup, the operation is simple, and the user experience is good. In addition, the upper air inlet channel and the lower air inlet channel form a variable cross-section channel, which is conducive to the rapid inhalation of oil smoke from the lower air inlet channel and buffering it in the upper air inlet channel. It can improve the unsteady flow separation caused by the distortion of the air inlet, stabilize the air pressure at the air inlet, ensure the consistency of the air speed at the air inlet, and reduce the escape of oil smoke. The variable cross-section channel simulates the principle of resistive silencer. When the noise enters the lower air inlet channel from the upper air inlet channel, the sound waves are reflected, thereby achieving the purpose of silencer. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the structure of the range hood according to an embodiment of the present invention (when the lower box body is raised);

[0023] Figure 2 for Figure 1 The schematic diagram of the internal structure of the range hood shown;

[0024] Figure 3 for Figure 1 A structural cross-sectional view of the range hood shown;

[0025] Figure 4 for Figure 1 A magnified schematic diagram of part A;

[0026] Figure 5 for Figure 1 A magnified schematic diagram of part B;

[0027] Figure 6It is a structural schematic diagram of an upper oil guide component of a range hood according to an embodiment of the present invention;

[0028] Figure 7 This is a schematic structural diagram of a lower oil guide plate according to an embodiment of the present invention;

[0029] Figure 8 It is a schematic diagram of the installation structure of the air inlet body, the lower oil guide plate and the oil cup according to an embodiment of the present invention;

[0030] Fig. 9 This is a structural schematic diagram of a range hood according to an embodiment of the present invention (when the lower housing is in a descending state);

[0031] Fig.10 for Fig. 9 The schematic diagram of the structure of the range hood shown is after the right side panel of the lower box body is removed;

[0032] Fig.11 for Fig. 9 A schematic diagram of the internal structure of the range hood;

[0033] Fig.12 for Fig. 9 A structural cross-sectional view of the range hood shown;

[0034] Fig.13 for Fig.12 A magnified schematic diagram of part C;

[0035] Fig.14 for Fig. 9 Schematic diagram of the internal structure of the range hood shown. DETAILED DESCRIPTION

[0036] The present invention is further described in detail below with reference to the accompanying drawings.

[0037] like Figures 1 to 5 As shown, the range hood of this embodiment is a lifting range hood, which includes an upper box body 1, a lower box body 2 and an air inlet body 3. An oil cup 4 is installed at the bottom of the air inlet body 3. The oil cup 4 is in a long strip shape and extends left and right. A fan 5 is installed in the upper box body 1. 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. In addition, the lower box body 2 is wrapped around the outside of the upper box body 1. Figure 3The direction indicated by the middle arrow D is backward, and the air inlet body 3 is accommodated in the rear part of the lower box body 2 and can perform lifting and lowering motion 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 each move separately under the drive of an independent driving mechanism. In this embodiment, the lower box body 2 and the air inlet body 3 perform synchronous lifting and lowering motions under the drive of the lifting mechanism. The lifting mechanism includes a lifting motor 141 installed on the upper box body 1 and a transmission assembly 142 installed on the output shaft of the lifting motor. The lower box body 2 and the air inlet body 3 are connected to the transmission assembly 142. Under the drive of the lifting motor 141, the lower box body 2 performs lifting and lowering motion relative to the upper box body 1, and the air inlet body 3 performs lifting and lowering motion relative to the lower box body 2. The transmission assembly can adopt various conventional transmission structures such as screw nuts, which will not be described in detail here.

[0038] An upper oil guide component 6 is installed inside the lower box body 2. The upper oil guide component 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 upper oil guide component 6. Therefore, the range hood adopts a structure in which the lower box body 2 wraps the upper box body 1. The oil on the upper box body 1 can flow smoothly into the upper oil guide component 6, and the oil flowing down from the lower box body 2 flows into the oil cup through the upper oil guide component 6 and the air inlet body 3.

[0039] The upper oil guide member 6 can adopt a variety of different structures, for example, it can be a plate-shaped structure as a whole, such as Figure 6 , Fig.12 and Fig.14 As shown, the upper oil guide component 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 64 and a right side 65, the left side 64 is directly or indirectly connected to the left mounting plate 12 inside the lower box body 2, and the right side 65 is directly or indirectly connected to the right mounting plate 13 inside the lower box body 2, and the vertical plate body of the upper oil guide component 6 is fixed on the front side plate 23 of the lower box body and / or the lower box body top plate 26, so that the left mounting plate 12, the right mounting plate 13, the upper oil guide component 6 and the back plate 21 of the lower box body 2 form an upper air inlet channel 81 in the lower box body 2. During the lifting process of the air inlet body 3, the vertical projection of the rear edge of the upper oil guide component 6 always falls into the air inlet body inner cavity 33. The oil flowing down from the lower box body 2 flows down from the rear edge of the upper oil guide component 6 and enters the oil cup 4 through the air inlet body inner cavity 33. The oil path will not be exposed on the outer surface of the air inlet body 3. The oil flowing down from the lower box body 2 refers to the oil flowing down from the vertical plate body of the upper oil guide component 6, the left mounting plate 12 and the right mounting plate 13. And the oil is guided from the box body to the air inlet body 3 through a shorter oil guide channel, and the oil is not easy to accumulate on the oil guide channel, realizing real-time oil guidance.

[0040] like Fig.12As shown, an opening is formed between the rear edge of the upper oil guide component 6 and the back plate 21 of the lower box body 2, and the opening extends downward to form a lower air inlet channel 82. A lower front plate 9 is connected between the rear portion of the upper oil guide component 6 and the bottom plate 22 of the lower box body 2. The lower front plate 9 is vertically arranged, and the lower portion of the lower front plate 9 is sealedly connected to the bottom plate 22 of the lower box body 2, and the upper portion of the lower front plate 9 is sealedly connected to the rear portion of the upper oil guide component 6 to prevent oil smoke from leaking from the connection between the two. The above-mentioned sealed connection method can be a direct connection or an indirect connection through other connecting parts. In this embodiment, as Figure 5 , Fig.10 and Fig.11 As shown, the rear part of the bottom plate 22 of the lower box body 2 has an upper flange 221 folded upward, and the lower part of the lower front plate 9 is connected and fixed on the upper flange 221. In this way, the upper oil guide component 6, the lower front plate 9, the bottom plate 22 of the lower box body 2, the front side plate 23 of the lower box body 2, the left side plate 24 of the lower box body 2 and the right side plate 25 of the lower box body 2 enclose a sealed cavity 10 isolated from oil smoke. The lower front plate 9 is connected between the bottom plate 22 and the upper oil guide component 6. On the one hand, it plays a certain supporting role for the upper oil guide component 6, and on the other hand, it plays a role in blocking oil smoke. The oil inside the hood will not enter the sealed cavity 10, avoiding the accumulation of oil on the lower surface of the upper oil guide component 6 and the bottom plate 22 of the lower box body 2.

[0041] The lower front plate 9 constitutes the front wall of the lower air inlet channel 82, the back plate 21 of the lower box body 2 constitutes the rear wall of the lower air inlet channel 82, the air inlet body 3 moves up and down in the lower air inlet channel 82, the front side of the air inlet body 3 is close to the lower front plate 9, the front side of the air inlet body 3 and the rear side of the lower front plate 9 are both vertically arranged and parallel to each other, and the gap between the front side of the air inlet body 3 and the rear side of the lower front plate 9 is less than 5mm. In this way, the oil at the bottom of the box body can be prevented from overflowing from the gap, and because the air inlet body 3 is arranged close to the lower front plate 9, the gap is small, and only a small amount of oil smoke enters the gap, reducing the amount of oil accumulation.

[0042] In this embodiment, an upper air inlet channel 81 is formed above the upper oil guide component, and an opening is formed between the rear edge of the upper oil guide component 6 and the back plate 21 of the lower box body 2, and the opening extends downward to form a lower air inlet channel 82. The inner cavity of the box body includes an upper air inlet channel 81 and a lower air inlet channel 82. The upper air inlet channel 81 is wide, that is, the front-to-back distance is large, and the lower air inlet channel 82 is narrow, that is, the front-to-back distance is narrow, and the upper air inlet channel 81 and the lower air inlet channel 82 form a variable cross-section channel. Since the lower box body 2 can be raised and lowered relative to the upper box body 1, the air inlet body 3 can also be raised and lowered. On the one hand, the upper air inlet channel 81 can be used to accommodate the upper box body 1, and the lower air inlet channel 82 is used to accommodate the air inlet body 3, so that the whole volume of the range hood is smaller when it is not in operation, the structure is compact, and the space occupied is small. On the other hand, the oil smoke enters the upper air inlet channel 81 through the narrow lower air inlet channel 82, and then enters the upper box body 1. Because the front-to-back width of the lower air inlet channel 82 is narrow, the oil smoke flow rate is fast, which can drive the external flow field to pull the airflow faster, giving the oil smoke a greater backward speed in the same time to prevent the oil smoke from escaping. But at the same time, the airflow here will also be turbulent, causing uneven oil smoke flow rate at the air inlet, affecting the oil smoke absorption effect, and the wide upper air inlet channel 81 is located downstream of the lower air inlet channel 82. At this time, the upper air inlet channel 81 can construct an efficient pressure stabilizing chamber, so that the airflow is buffered and stabilized in the pressure stabilizing chamber, ensuring that the air inlet has basically the same wind speed, avoiding the problem of smoke running on both sides of the range hood. In addition, the oil in the upper box body 1 will drip into the lower box body 2, and the problem of oil splashing and falling is difficult to deal with, especially when there is a lot of condensed oil inside the fan 5. The use of a wide upper air inlet channel 81 can effectively reduce the wind speed, reduce the impact of the airflow on the trajectory of the oil droplets, avoid the splashing of oil droplets dripping from the volute, and help maintain the cleanliness of the interior of the range hood.

[0043] In addition, the variable cross-section channel can also effectively block the direct transmission of fan system noise to the outside. By simulating the principle of resistive silencing, the sound waves emitted by the fan 5 are reflected multiple times inside the wide upper air inlet channel 81 and are offset, thereby constructing a variable cross-section acoustic impedance to reduce the energy of sound propagation from the fan air inlet to the range hood air inlet. In addition, the airflow buffer cavity constructed by the upper air inlet channel 81 simulates a static pressure box, which can improve the unsteady flow separation caused by inlet distortion, thereby reducing pressure pulsation and improving sound quality.

[0044] In this embodiment, the upper oil guide component 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 upper oil guide component 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.

[0045] In this embodiment, a concave oil guide groove 61 is formed in the middle of the upper oil guide component 6, and the bottom surface of the oil guide groove 61 is inclined relative to the upper oil guide component 6. A fan 5 is installed in the upper box body 1, and the fan 5 is located above the upper oil guide component 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 guide groove 61. On the one hand, the oil guide groove 61 can avoid interference with the fan 5 after the whole machine is folded, reduce the height of the whole machine, improve installation adaptability, convenience and save manufacturing costs; on the other hand, the oil guide 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 of the whole machine.

[0046] like Figure 3 , Figures 8 to 14 As shown, the air inlet body 3 of this embodiment has an air inlet main body 31, the front side of the air inlet main body 31 is close to the lower front plate 9, and an air inlet 32 ​​is opened on the front side of the air inlet main body 31. The air inlet 32, the lower air inlet channel 82 and the upper air inlet channel 81 are fluidically connected. The front side of the air inlet body 3 is provided with an upper guide plate 11 extending left and right, and the upper guide plate 11 is vertically arranged above the air inlet 32. The front side of the upper guide plate 11 is the front side of the air inlet main body 31. The air inlet inner cavity 33 is formed between the upper guide plate 11 and the air inlet body back plate 34, and the projection of the air inlet main body 31 in the vertical direction falls in the oil cup 4. The upper guide plate 11 can reduce the height of the air inlet 32, 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.

[0047] like Figure 12 to Figure 14 As shown, the bottom of the lower front plate 9 of this embodiment has a lower folding edge 91 bent backward and downward, and 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 rear side of the lower front plate 9 and the oil in the gap between the lower front plate 9 and the air inlet body 3 can be guided to the oil cup 4 through the lower folding edge 91. When the air inlet body 3 is lowered to the lowest position, that is, the range hood is in the working state, a line seal is formed between the lower folding edge 91 and the front side of the upper guide plate 11, which can improve the pressure relief effect. In addition, the top of the upper guide plate 11 has an upper folding edge 111 bent forward and upward, and the lower folding edge 91 and the upper folding edge 111 have opposite surfaces. Preferably, the two opposite surfaces are parallel to each other. When the air inlet body 3 is lowered to the lowest position, the opposite surfaces of the lower folding edge 91 and the upper folding edge 111 are abutted or close to each other to form a surface seal between the upper guide plate 11 and the lower front plate 9, which has a better sealing effect, can better prevent pressure relief, and ensure the oil fume extraction effect.

[0048] like Figure 3 , Figure 4 , Figure 7 , Figures 11 to 14As shown, a lower oil guide plate 7 is installed on the top of the air inlet main body 31. The lower oil guide plate 7 is a grille plate. The lower oil guide plate 7 is tilted downward from front to back. The front part of the lower oil guide plate 7 is provided with an oil guide surface 71. The projection of the rear edge of the upper oil guide component 6 in the vertical direction falls on the oil guide surface 71. The lower oil guide plate 7 has an oil guide channel 72. The oil guide channel 72 is arranged on the rear side of the oil guide surface 71. The oil guide channel 72 extends in the front and rear directions and is spaced apart from left to right. An oil leakage hole 73 is opened at the lowest position of the rear of the oil guide channel 72. The projection of the oil leakage hole 73 in the vertical direction falls into the oil cup 4. In addition, in this embodiment, oil leakage holes 73 are opened at both left and right positions of the lowest point of each oil guide channel 72, 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. When guiding the oil, the oil on the upper oil guiding component 6 drips backward onto the oil guiding surface 71 of the lower oil guiding plate 7 , and the oil on the oil guiding surface 71 flows backward and downward along the oil guiding channel 72 , and finally flows into the oil cup 4 through the oil leakage hole 73 .

[0049] In this embodiment, the width of the oil guide channel 72 in the middle area is greater than the width of the oil guide channel 72 in the left and right side areas, and the oil guide channel 72 in the middle area corresponds to the oil guide groove 61 of the upper oil guide component 6. The oil guide channel 72 in the middle area can smoothly receive the oil coming out of the oil guide groove 61, so that the oil flowing down from the oil guide groove 61 on the upper oil guide component 6 can enter the wider oil guide channel 72 in the middle, and the oil flowing down from other positions of the upper oil guide component 6 enters the narrower oil guide channels 72 on the left and right sides, thereby realizing reasonable oil guide division. In addition, the air inlet area in the middle area of ​​the lower oil guide plate 7 is relatively small, and the air inlet area in the left and right side areas is relatively large. Since the left and right side areas correspond to the stove eyes on the left and right sides of the stove, flow distribution can be better realized.

[0050] When the range hood is not in operation, Figures 1 to 3 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, which is more simple and beautiful. The air inlet main body 31 is not higher than the upper oil guide component 6, and the height of the lower oil guide plate 7 is also lower than the upper oil guide component 6, so that the oil on the upper oil guide component 6 can smoothly fall onto the lower oil guide plate 7. At this time, the upper oil guide component 6 is completely located above the front side of the air inlet body 3. Therefore, during the entire lifting process, the oil inside the lower box body 2 can be smoothly introduced into the oil cup 4 at the bottom of the air inlet body 3, avoiding flowing out from the gap between the air inlet body 3 and the lower front plate 9.

[0051] When the range hood is in operation, Figures 9 to 14As shown, the lower box 2 is lowered to the lowest position, the air inlet 3 is lowered to the lowest position synchronously and extends downward from the bottom of the lower box 2, the air inlet 32 ​​of the air inlet 3 is exposed, and the negative pressure area is lowered to improve the smoke absorption effect. In addition, under different working conditions, the lower box 2 and the air inlet 3 can be intelligently controlled. When the air inlet 3 is lowered to the lowest position, the lower box 2 is also lowered to the lowest position synchronously, the negative pressure area is lowered, and the bottom plate 22 of the lower box 2 is arranged above the front of the air inlet 32 ​​to form a smoke collection area, which plays a role in collecting smoke.

[0052] In addition, when the air inlet body 3 rises to the highest position, it is possible that part of the upper oil guide component 6 is located above the front side of the air inlet body 3, for example, the highest point of the upper oil guide component 6 is located above the highest point of the front side of the air inlet body 3, and the rear edge of the upper oil guide component 6 is located below the highest point of the front side of the air inlet body. At this time, it can also ensure that the oil on the upper oil guide component 6 drips smoothly onto the lower oil guide plate 7, preventing the oil from flowing out from the gap between the air inlet body 3 and the lower front plate 9.

[0053] 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.

[0054] The "fluid connection" referred to in the present invention refers to the spatial position relationship between two parts or parts, which are collectively referred to as the first part and the second part respectively below, that is, 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 a housing and an air inlet body (3) disposed on the housing, an oil cup (4) being mounted at the bottom of the air inlet body (3), the air inlet body (3) comprising an air inlet main body (31), the air inlet main body (31) comprising an upper guide plate (11) extending leftward and rightward, an air inlet body inner cavity (33) being formed between the upper guide plate (11) and an air inlet body back plate (34), characterized in that: An upper oil guide component (6) extending from front to rear is provided inside the box body, an upper air inlet channel (81) is formed above the upper oil guide component (6), an opening is formed between the rear edge of the upper oil guide component (6) and the back plate (21) of the box body, the opening extends downward to form a lower air inlet channel (82), the inner cavity of the box body includes the upper air inlet channel (81) and the lower air inlet channel (82), the air inlet body (3) performs lifting movement in the lower air inlet channel (82) under the drive of the lifting mechanism, a lower oil guide plate (7) is installed on the top of the air inlet main body (31), an oil guide surface (71) is provided on the lower oil guide plate (7), the rear edge of the upper oil guide component (6) is projected in the vertical direction onto the oil guide surface (71), and the oil falling onto the oil guide surface (71) flows into the oil cup (4).

2. The range hood according to claim 1, characterized in that: When the air inlet body (3) is raised to the highest position, at least a portion of the upper oil guide component (6) is located above the front side of the air inlet body (3).

3. The range hood according to claim 2, characterized in that: When the air inlet body (3) is raised to the highest position, the upper oil guide component (6) is completely located above the front side of the air inlet body (3).

4. The range hood according to claim 2, characterized in that: When the air inlet body (3) rises to the highest position, the highest point of the upper oil guide component (6) is located above the highest point of the front side surface of the air inlet body (3), and the rear edge of the upper oil guide component (6) is located below the highest point of the front side surface of the air inlet body (3).

5. The range hood according to claim 1, characterized in that: The upper oil guide component (6) is an upper oil guide plate, and a lower front plate (9) is connected between the rear portion of the upper oil guide plate and the bottom plate (22) of the box body. The upper oil guide plate, the lower front plate (9), the bottom plate (22) of the box body, the front side plate (23) of the box body, the left side plate (24) of the box body, and the right side plate (25) of the box body enclose a sealed cavity (10) isolated from oil smoke.

6. The range hood according to claim 5, characterized in that: The rear part of the bottom plate (22) of the box body has an upper flange (221) folded upward, the lower part of the lower front plate (9) is connected and fixed to the upper flange (221), and the upper part of the lower front plate (9) is connected and fixed to the rear part of the upper oil guide plate.

7. The range hood according to claim 1, characterized in that: The air inlet body (3) comprises an air inlet main body (31), an air inlet port (32) is formed on the front side of the air inlet main body (31), and the air inlet port (32), the lower air inlet channel (82) and the upper air inlet channel (81) are fluidically connected.

8. The range hood according to claim 1, characterized in that: The lower oil guide plate (7) is a grid plate having an oil guide channel (72) thereon. The oil guide channel (72) is arranged at the rear side of the oil guide surface (71), and the oil on the oil guide surface (71) flows into the oil cup (4) through the oil guide channel (72).

9. The range hood according to claim 8, characterized in that: The lower oil guide plate (7) is arranged to be inclined downward from front to back, and an oil leakage hole (73) is opened at the lowest position of the rear part of the oil guide channel (72), and the projection of the oil leakage hole (73) in the vertical direction falls into the oil cup (4).

10. The range hood according to claim 1, characterized in that: The lifting mechanism comprises a lifting motor (131) mounted on a box body and a transmission assembly (132) mounted on an output shaft of the lifting motor. The air inlet body (3) is connected to the transmission assembly. Driven by the lifting motor (131), the air inlet body (3) performs lifting motion relative to the box body.

11. The range hood according to claim 1, characterized in that: The oil cup (4) is in the shape of an elongated strip, and the projection of the air inlet main body (31) in the vertical direction falls into the oil cup (4).

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