Range hood

Abstract

The utility model discloses a range hood, and relates to the technical field of kitchen appliances, the range hood comprises a case and a fan arranged in the case, the fan comprises an air outlet, and a first air inlet and a second air inlet which are oppositely arranged on two sides of the fan; a receding groove is formed in a back plate of the machine box, an air passing channel is formed between the surface of the draught fan and the groove wall of the receding groove, and the second air inlet communicates with the air passing channel. According to the technical scheme provided by the utility model, the suction range of the range hood is expanded through the fan with the double air inlets; the receding groove is formed in the rear back plate, an air channel for rear air inlet is increased, the air flowing resistance of an air inlet of the fan is reduced, the smoke suction effect is improved, and the noise of the whole machine is reduced. In addition, the rigidity of the back plate is improved through the receding groove, and therefore shaking and vibration abnormal noise of the whole machine are weakened.

Description

Technical Field

[0001] The utility model relates to the technical field of kitchen appliances, in particular to a range hood. Background Art

[0002] Range hoods are widely used in kitchens. For example, side-suction range hoods absorb the fumes and odors generated during cooking through side air intake to purify the kitchen air. They are usually installed on the side of the stove to capture fumes more effectively. At present, side-suction range hoods have problems such as large wind resistance and high noise. Utility Model Content

[0003] The main purpose of the utility model is to provide a range hood, which aims to expand the suction range of the range hood through a fan with double air inlets; to increase the air duct of the rear air intake by arranging a clearance groove on the back plate, reduce the air flow resistance at the fan inlet, improve the smoke extraction effect and reduce the noise of the whole machine; in addition, the clearance groove also increases the rigidity of the back plate, thereby reducing the shaking and vibration noise of the whole machine.

[0004] In order to achieve the above-mentioned object, the range hood proposed by the utility model comprises:

[0005] A fan, comprising an air outlet and a first air inlet and a second air inlet arranged on two sides of the fan; and

[0006] A chassis, the chassis has a smoke inlet and a smoke exhaust port, the fan is arranged in the chassis, the air outlet is communicated with the smoke exhaust port, the chassis includes a back plate opposite to one side of the smoke inlet, the fan is spaced from the back plate, and the surface of the back plate close to the second air inlet is recessed in a direction away from the fan to form a clearance groove, and an air passage is formed between the surface of the fan and the groove wall of the clearance groove.

[0007] In one embodiment, in the left-right direction of the range hood, the width of the clearance groove is greater than or equal to the width of the fan.

[0008] In one embodiment, the bottom wall of the recess is parallel to the outer wall surface of the lower end of the fan adjacent to the second air inlet.

[0009] In one embodiment, the clearance groove includes a lower side wall, the lower side wall exceeds the bottom of the fan, and the lower side wall is inclined downward toward the fan.

[0010] In one embodiment, the clearance groove further includes an upper side wall opposite to the lower side wall, and an end of the upper side wall is inclined upward and parallel to a lower edge of the second air inlet.

[0011] In one embodiment, the depth of the relief groove is less than or equal to 12 mm.

[0012] In one embodiment, a strengthening structure is further provided on the back plate.

[0013] In one embodiment, the strengthening structure is a plurality of strengthening grooves formed by recessing on the back plate.

[0014] In one embodiment, the depth of each of the strengthening grooves is less than the depth of the relief groove.

[0015] In one embodiment, the plurality of strengthening grooves include two first strengthening grooves and two second strengthening grooves. The two first strengthening grooves are respectively disposed on both sides of the relief groove, and the two second strengthening grooves are disposed below the relief groove and the second strengthening groove.

[0016] In one embodiment, a diversion structure is provided on both the strengthening groove and the relief groove. The diversion structure is used to direct the oil fluid to the middle area of the back plate.

[0017] In one embodiment, the diversion structure includes two adjacent groove walls of the first strengthening groove. The two adjacent groove walls are close to the relief groove and are inclined towards the lower side wall of the relief groove.

[0018] In one embodiment, the diversion structure further includes the lower side wall of the relief groove. The lower side wall is inclined downward from both ends to the middle in the width direction.

[0019] In one embodiment, the machine case includes an upper box body and a smoke collecting hood disposed below the upper box body and connected to the upper box body. The smoke exhaust port is disposed on the upper box body, the back plate is disposed on the smoke collecting hood, the fan includes a volute, and the air outlet is disposed at the upper end of the volute; the first air inlet and the second air inlet are located on opposite sides of the volute;

[0020] The range hood further includes a support member. The support member is disposed on the back plate and is located below the relief groove. The support member supports the lower end of the volute. A part of the volute is located inside the upper box body and a part is located inside the smoke collecting hood.

[0021] In one embodiment, an installation convex part is further provided on the back plate. The two second strengthening grooves are located on both sides of the installation convex part, and the support member is disposed on the installation convex part.

[0022] The technical solution of the present utility model: First, the design of the relief groove can reduce the resistance of air flow, improve the efficiency of air flow, make the air passage smoother, thereby enhancing the smoking effect and reducing the noise of the whole machine. Second, the design of the relief groove can avoid the formation of cleaning dead corners, making the cleaning and maintenance of the range hood more convenient. Moreover, the groove wall of the relief groove can be used as a guide for the oil drainage direction of the back panel under the action of the air at the air inlet, guiding the condensed oil to the middle area, reducing a large number of condensed oil marks on the surface of the back panel of the cabinet, and being easy for users to clean. In addition, by forming a relief groove on the back panel, the structural strength of the back panel can also be improved, thereby weakening the jitter and vibration abnormal noise of the whole machine, and to a certain extent, the internal space of the chassis can be utilized more effectively, which may provide more layout space for the fan or other components and optimize the overall design. Description of the Drawings

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the structures shown in these drawings.

[0024] Figure 1 It is a schematic structural diagram of an embodiment of the range hood provided by the present utility model;

[0025] Figure 2 It is Figure 1 a schematic structural diagram showing the back panel and the volute part exposed in

[0026] Figure 3 It is Figure 1 a schematic cross-sectional structural diagram of the side of the range hood in

[0027] Figure 4 It is Figure 1 a schematic structural diagram of an embodiment of the back panel in

[0028] Explanation of the reference numerals in the drawings:

[0029] 100, Range hood; 101, Air passing channel; 200, Chassis; 201, Smoke inlet; 202, Smoke outlet; 210, Rear panel; 220, Relief groove; 221, Upper side wall; 222, Bottom wall of the groove; 223, Lower side wall; 230, Mounting protrusion; 240, Reinforcement structure; 241, Reinforcement groove; 242, First reinforcement groove; 243, Second reinforcement groove; 250, Flow guiding structure; 203, Upper box body; 204, Smoke collecting hood; 300, Fan; 310, Volute; 311, Air outlet; 312, First air inlet; 313, Second air inlet; 400, Support member; 401, Upper surface; 410, Oil chamber; 420, Oil port.

[0030] The realization, functional features and advantages of the present utility model will be further described in conjunction with embodiments with reference to the accompanying drawings. Detailed implementation manners

[0031] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0032] It should be noted that if there are directional indications (such as up, down, left, right, front, back,...) involved in the embodiments of the present utility model, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0033] In addition, if there are descriptions such as "first" and "second" involved in the embodiments of the present utility model, the descriptions of "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or a solution where A and B are satisfied simultaneously. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present utility model.

[0034] The side suction range hood is a kitchen electrical appliance widely used in the kitchen. It absorbs the oil fumes and odors generated during cooking through the side air intake method to achieve the purpose of purifying the kitchen air. It is usually installed on the side of the stove to capture oil fumes more effectively. Currently, the side suction range hood has problems of relatively large wind resistance and relatively high noise of the whole machine.

[0035] In the design of the traditional range hood 100, the back panel is usually directly connected to the surface of the fan, which will limit the efficiency of air flow to a certain extent, and form a hard-to-clean dead corner between the fan and the back panel. In addition, it will also cause the back panel to vibrate and produce vibration noises.

[0036] For this reason, the present utility model proposes a range hood 100.

[0037] Please refer to Figure 1 , in an embodiment of the present utility model, the range hood 100 includes a chassis 200 and a fan 300 arranged in the accommodation cavity of the chassis 200. The fan 300 includes an air outlet 311 and a first air inlet 312 and a second air inlet 313 oppositely arranged on both sides of the fan 300; the chassis 200 also has a smoke inlet 201 and a smoke outlet 202 communicating with the accommodation cavity. The air outlet 311 is communicated with the smoke outlet 202. The chassis 200 has a back panel 210 opposite to one side of the smoke inlet 201. The surface of the back panel 210 close to the second air inlet 313 is recessed along the direction away from the fan 300 to form a relief groove 220. The surface of the fan 300 and the groove wall of the relief groove 220 form an air passage 101 communicating with the accommodation cavity, and the second air inlet 313 is communicated with the air passage 101.

[0038] Compared with the design of the traditional range hood 100, the back panel 210 is usually directly connected to the surface of the fan 300, which will limit the efficiency of air flow to a certain extent, or form a hard-to-clean dead corner between the fan 300 and the back panel 210, and cause the back panel 210 to vibrate and produce vibration noises.

[0039] The technical solution of the present utility model is as follows. First, through the design of the relief groove 220, the resistance of air flow can be reduced, the efficiency of air flow can be improved, and the air passage can be made smoother, thereby enhancing the smoking effect. Second, the groove wall of the relief groove 220 can be used as the oil guiding direction of the back panel 210 under the action of the air at the smoke inlet 201 to guide the condensed oil to the middle area, reducing a large amount of condensed oil marks on the surface of the back panel 210 of the box body, which is easy for users to clean. Finally, by forming a groove on the back panel 210, the structural strength of the back panel 210 can also be improved, and to a certain extent, the internal space of the chassis 200 can be used more effectively, which may provide more layout space for the fan 300 or other components and optimize the overall design.

[0040] Refer toFigure 2 , Figure 2 The middle arrow indicates the airflow direction (the large arrow indicates the first air inlet, and the small arrow indicates the second air inlet). Compared with the conventional single-inlet range hood, the present solution uses a fan 300 with two air inlets, which can expand the suction range, so that the range hood can absorb the oil smoke generated during cooking more quickly and more comprehensively. In particular, when the cooking area in the kitchen is large or there are multiple stoves, a single air inlet may not be able to fully and effectively absorb the oil smoke. For different kitchen layouts or widely distributed stoves, dual air inlets can provide a more flexible smoke extraction solution.

[0041] The range hood 100 is a side-suction range hood or a small side-suction range hood, and the main difference between them is whether the fan 300 occupies the entire space of the chassis 200, that is, the small side-suction range hood 100 is suitable for small apartments or families with limited kitchen space, while the standard side-suction range hood 100 is suitable for families with higher requirements on the smoke extraction effect or with a larger kitchen space.

[0042] But no matter which form it is, the side suction range hood 100 is mainly used to absorb the oil smoke and odor generated during cooking to keep the kitchen air fresh. It is usually installed on the side of the stove to capture the oil smoke more effectively. The side suction range hood 100 includes a chassis 200, a fan 300, a filter, a lighting device, a control panel, a mounting bracket, etc. The chassis 200 is the external structure of the side suction range hood 100, which is usually made of stainless steel or metal and has the characteristics of durability and easy cleaning. The mounting bracket is used to fix the range hood on a wall or a cabinet. The chassis 200 has a smoke inlet 201, and the filter / oil filter is located at the entrance of the smoke inlet 201 to capture grease and large particles in the oil smoke to prevent them from entering the interior. The lighting device can provide additional light sources when cooking. The control panel is used to operate the switch of the range hood, adjust the wind force, and light functions. The exhaust pipe connects the exhaust port 202 of the chassis 200 and the outside to discharge the sucked oil smoke outdoors or connect to a public flue. The oil cup / oil box collects the filtered grease and needs to be cleaned regularly. Some additional parts may be included, such as air guide plates, sound insulation materials, etc., to improve the performance and user experience of the range hood.

[0043] Reference Figure 3 The surface of the fan 300 and the groove wall of the give way groove 220 form an air passage 101 connected to the accommodating cavity, that is, the fan 300 is arranged at a distance from the back plate 210 on the side facing the back plate 210. The fan 300 generates a strong suction force, so that the oil smoke and steam generated during cooking are sucked in from the smoke inlet 201 and divided into two parts from the bottom of the fan 300. One part enters the fan 300 from the first air inlet 312 of the fan 300, and the other part enters the second air inlet 313 through the air passage 101, and is finally discharged from the air outlet 311 through the smoke exhaust port 202.

[0044] Reference Figure 2 and Figure 3 In this case, the negative pressure generated by the blower 300 at the second air inlet 313 will suck the flue gas in from both sides of the outer shape of the volute 310. To improve the air intake effect, in the left - right direction of the range hood 100, the width of the relief groove 220 is greater than or equal to the width of the blower 300. The relief groove 220 extends along the width direction of the blower 300, and the extension length of the relief groove 220 is not less than the width of the blower 300. The extension length of the relief groove 220 not being less than the width of the blower 300 can ensure a wider air flow path, thereby improving the efficiency of air flow and increasing the amount of smoke suction. The relief groove 220 is part of the air duct. A wider air duct can guide the air to flow more smoothly through the blower 300, reduce the resistance of air flow, reduce the turbulence and eddy current during air flow, thereby reducing noise and enhancing the user experience. In addition, a wider groove can, to a certain extent, enhance the structural stability between the rear panel 210 and the blower 300, reducing the structural deformation caused by vibration or wind force.

[0045] The flue gas or steam enters the air - passing channel 101 through the lower end of the blower 300 and the surface of the rear panel 210. If the distance between the lower end and the rear panel 210 is too small, it will increase the turbulence and noise.

[0046] Reference Figure 3 In this embodiment, to improve the air intake effect and reduce noise, the relief groove 220 includes a lower side wall 223. The lower side wall 223 extends beyond the bottom of the blower 300 and the lower side wall 223 is inclined downward towards the blower 300.

[0047] The design that the lower side wall 223 extends beyond the bottom of the blower 300 and is inclined downward makes the inlet of the air - passing channel 101 change from facing the bottom of the chassis 200 to facing the smoke inlet 201 of the chassis 200, and expands the inlet of the air - passing channel 101. The inclined lower side wall 223 helps to reduce the turbulence generated during air flow, thereby reducing noise and providing a quieter cooking environment. And, the inclined lower side wall 223 also helps to guide the oil fume to flow smoothly into the blower 300 along the inclined surface, optimizing the air flow path and improving the smoke suction efficiency.

[0048] Reference Figure 3 In this embodiment, to allow the flue gas to pass through the air - passing channel 101 more smoothly and enter the second air outlet, the relief groove 220 includes an upper side wall 221 opposite to the lower side wall 223. The end of the upper side wall 221 is inclined upward and is parallel to the edge of the second relief opening.

[0049] The middle part of the volute 310 forms a circular second air inlet connected to the interior, the edge of the second air inlet is an arc transition, and the end of the upper side wall 221 is tilted upward, so that the projection of the upper side wall 221 and the edge of the second avoidance port on the vertical section is parallel, so that the smoke passing through the air passage 101 can be guided into the second air inlet, and the outlet of the air passage 101 formed by the parallel setting has a better smoke exhaust effect compared with the narrow opening setting; compared with the expansion setting, it avoids the diffusion of smoke and enters the second air inlet more concentratedly, reducing the turbulence and eddy current generated during the air flow process, thereby reducing noise. The inclined design of the upper side wall 221 and the lower side wall 223 can expand the smoking range, making it easier to inhale the oil smoke rising from the stove.

[0050] In addition, viewed from the outside of the back panel 210 , the inclined design of the upper side wall 221 and the lower side wall 223 can serve as a visual element of the back panel 210 , thereby increasing the design sense and aesthetics of the product.

[0051] It should be noted that the edge of the second air inlet refers to the outer boundary or contour line of the second air inlet 313 at the bottom of the fan 300. The edge is the boundary line between the second air inlet 313 and other parts inside the range hood. In the case of a smooth or inclined edge, the contour line of the edge is arranged parallel in the general visual perception of the vertical cross section.

[0052] Reference Figure 3 In order to reduce the turbulence generated during the air flow and thus reduce the noise, the bottom wall 222 of the recess 220 is parallel to the outer wall surface of the lower end of the fan 300 near the second air inlet 313. This means that in the cross section, the air passages 101 are parallel. The parallel air passages 101 help the air to flow evenly in the cross section, reducing the unevenness and turbulence of the air flow, thereby improving the smoking efficiency. When the air flows more evenly, the noise caused by uneven air flow can be reduced, providing users with a quieter kitchen environment. If the air flows more smoothly, the energy consumption required by the fan 300 during operation may be reduced because the additional energy required to overcome turbulence is reduced.

[0053] When the range hood is installed, it is connected to the wall through a mounting bracket, which is usually arranged on the back plate 210 of the chassis 200. In order to prevent the recess 220 from protruding too much from the back plate 210 and affecting the installation of the range hood, the depth of the recess 220 is limited to be less than or equal to 12 mm and not 0, such as 3 mm, 5 mm, 7 mm, 10 mm, etc.

[0054] The upper side wall 221 and the lower side wall 223 of the clearance groove 220 in the up and down direction of the fan 300 are inclined. The depth of the clearance groove 220 is measured as the height from the bottom wall 222 of the groove to the non-recessed surface. If there are multiple inconsistencies, the average integer is taken.

[0055] Because the arrangement of the recess 220 can provide more layout space for the fan 300, so as to more effectively utilize the internal space of the chassis 200 and optimize the overall design, in this embodiment, the upper end of the fan 300 is inclined toward one side of the smoke inlet 201, so that the first air inlet 312 of the fan 300 is inclined toward the smoke inlet 201, so that the first air inlet 312 is closer to the smoke inlet 201, which can expand the suction range, so that the range hood can absorb the oil smoke generated during cooking more quickly and more comprehensively. Especially when the cooking area in the kitchen is large or there are multiple stoves, a single air inlet may not be able to fully and effectively absorb the oil smoke.

[0056] In addition, due to the setting of the yield groove 220 and the parallel air passage 101, it can be ensured that the second air inlet 313 can intake air smoothly at the back plate 210, and the gap between the second air inlet 313 and the back plate 210 will not change suddenly in the direction of smoke flow due to the tilt of the fan 300, thereby optimizing the air duct of the fan 300, reducing the air duct resistance loss, and reducing the noise of the whole machine.

[0057] In this embodiment, the chassis 200 includes an upper box body 203 and a smoke hood 204 disposed below and connected to the upper box body 203, the smoke exhaust port 202 is disposed on the upper box body 203, the back plate 210 is disposed on the smoke hood 204, the fan 300 includes a volute 310, and the air outlet 311 is disposed at the upper end of the volute 310; the first air inlet 312 and the second air inlet 313 are located on opposite sides of the volute 310; the range hood 100 also includes a support member 400, the support member 400 is disposed on the back plate 210, and is located below the give way groove 220, the support member 400 supports the lower end of the volute 310, and part of the volute 310 is located in the upper box body 203, and the support of the support member 400 facilitates the volute 310 to tilt toward the air inlet, so that the first air inlet 312 is closer to the smoke inlet 201, thereby improving the smoking efficiency.

[0058] By arranging the smoke exhaust port 202 on the upper box body 203, the back plate 210 on the smoke hood 204, and partially locating the fan 300 in the upper box body 203, this design optimizes the spatial layout and makes the overall structure more compact. The support member 400 supports the lower end of the volute 310, which helps to stabilize the structure of the fan 300, reduce vibration caused by wind, and reduce noise.

[0059] In addition, the air inlet net arranged at the second air inlet 313 of the volute has a mesh structure, which not only meets the safety requirements, but also can weaken the vortex at the fan air inlet 210, so that the smoke enters the fan system more evenly, improves the working efficiency of the fan impeller, and reduces the noise of the whole machine.

[0060] Without loss of generality, when the support member 400 is not provided, the rigid structure of the chassis 200 or the strength of the fan 300 itself may be relied upon to maintain stability, but this may cause structural deformation or vibration under high loads.

[0061] In addition, the support member 400 can serve as a contact point for adjustment and maintenance, facilitating installation and maintenance work.

[0062] Furthermore, in order to reduce the noise of the whole machine, a reinforcement structure 240 is also provided on the back plate 210 .

[0063] In this embodiment, the reinforcement structure 240 is a plurality of reinforcement grooves 241 formed by depressions on the back plate 210 .

[0064] Reference Figure 4 Specifically, the plurality of reinforcement grooves 241 include two first reinforcement grooves 242 and two second reinforcement grooves 243 . The two first reinforcement grooves 242 are respectively arranged on both sides of the clearance groove 220 , and the two second reinforcement grooves 243 are arranged below the clearance groove 220 and the second reinforcement grooves 243 .

[0065] The depth of the reinforcing groove 241 is less than the depth of the giving way groove 220. The depth of the reinforcing groove 241 is less than the depth of the giving way groove 220. By pressing two different depths, the rigidity of the back plate 210 of the chassis 200 can be effectively improved, and the shaking and vibration noise of the whole machine can be reduced.

[0066] Reference Figure 4 Furthermore, a mounting protrusion 230 is further provided on the back plate 210, and the side walls of the two second reinforcement grooves 243 overlap with the two sides of the mounting protrusion 230, and the support member 400 is provided on the mounting protrusion 230. The adjacent side walls of the two second reinforcement grooves 243 protrude from the surface of the back plate 210 to form the mounting protrusion 230, and the support member 400 is provided on the mounting protrusion 230, and the two reinforcement grooves are symmetrical about the mounting protrusion 230. The second reinforcement groove 243 located below the recess 220 can improve the structural strength of the back plate 210 on the one hand, and on the other hand, the two symmetrically arranged second reinforcement grooves 243 can cooperate with the two smoke inlets 201 set on the smoke collecting hood 204, each corresponding to a second reinforcement groove 243, to improve and optimize the smoke inlet path, improve the efficiency of the range hood 100, and improve the visual appearance effect.

[0067] In other embodiments, the two second reinforcement grooves 243 are integrally formed, and the mounting protrusion 230 is a single part mounted in the entire second reinforcement groove 243 .

[0068] In summary, by arranging a plurality of reinforcing grooves 241 on the periphery of the relief groove 220 and defining that the depths of the plurality of reinforcing grooves 241 are different from that of the relief groove 220, the structural strength of the back plate 210 is improved; in addition, the protruding mounting protrusion 230 can further improve the structural strength of the back plate 210 on the basis of not changing the material and thickness of the back plate 210, avoiding vibration and generating noise.

[0069] Referring to Figure 4 , further, in order to reduce the accumulation of a large area of condensed oil stains on the surface area of the back plate 210 and facilitate user cleaning, a diversion structure 250 is further provided on the back plate 210, and the diversion structure 250 is used to direct the oil liquid to the middle area of the back plate 210.

[0070] In this embodiment, the diversion structure 250 is arranged on the reinforcing groove 241 and the relief groove 220, and the diversion structure 250 is used to direct the condensed oil liquid to the middle area of the back plate 210.

[0071] The diversion structure 250 includes two adjacent groove walls of the first reinforcing groove 242. The two adjacent groove walls are close to the relief groove 220 and are inclined towards the lower side wall 223 of the relief groove 220 so that the oil liquid flows towards the position where the relief groove 220 is located.

[0072] Further, the diversion structure 250 further includes that the lower side wall 223 of the relief groove 220 is inclined downward from both ends to the middle in the width direction. In this way, the oil liquid flowing to the lower side wall 223 of the relief groove 220 is gathered in the middle of the lower side wall 223 under the action of gravity. During steam cleaning or smoking, the air flow entering the second air inlet 313 from the back plate 210 will generate an upward acting force on the liquid on the back plate 210. Under the action of gravity, the oil liquid will also flow along the groove wall of the diversion groove in the inclined direction to the middle area of the back plate 210 and flow into the oil cup at the bottom of the chassis 200, avoiding a large area of oil stains left on the back plate 210 due to gravity.

[0073] In other embodiments, the diversion structure 250 can be a diversion rib. The diversion rib can be arranged in the relief groove 220 (in the case of extending to both ends), or can be located on both sides of the relief groove 220.

[0074] In order to facilitate the accommodation of the collected liquid and avoid the accumulation of oil, in this embodiment, the support member 400 has an oil chamber 410, an oil port 420 communicating with the oil chamber 410 is provided on the upper surface of the support member 400, the upper surface of the support member 400 is inclined downward toward the smoke inlet 201, and the oil port 420 is closer to the smoke inlet 201 than the lower end of the volute 310. The support member 400 having the oil chamber 410 can conveniently collect the grease and liquid flowing down from the range hood, and avoid the accumulation of grease inside the device. The design that the upper surface of the support member 400 is inclined downward toward the smoke inlet 201 enables the grease to flow along the inclined surface toward the oil port 420, preventing the liquid from flowing backward or splashing out.

[0075] Referring to Figure 4 , specifically, both sides of the upper surface of the support member 400 are warped into an arc shape to fit part of the contour of the bottom of the volute 310. On the one hand, it can provide better support and fixation, ensuring the stability of the volute 310 during operation and reducing the noise caused by poor contact or vibration; on the other hand, it can also facilitate the entry of the oil into the oil port 420. Moreover, the arc-shaped warping design not only provides advantages in function but also increases the aesthetic appearance of the product visually.

[0076] In addition, the two side walls of the mounting convex portion 230 approach each other in the direction toward the bottom of the chassis 200, and the contour of the support member 400 is adapted to that of the mounting convex portion 230. The support member 400 is sleeved on the mounting convex portion 230. The oil liquid that converges toward the support member 400 from the lower groove wall and the side groove wall of the first reinforcing groove 242 due to gravity and air blowing, part of it flows into the oil chamber 410 through the oil port 420 of the support member 400; part of it will flow along the outer contour of the mounting convex portion 230 or the support member 400 into the oil cup at the bottom of the chassis 200; thus avoiding the residue of a large area of oil stains on the rear panel 210, so that a cleaner visual experience can be presented in the visible area of the rear panel 210 during long-term use.

[0077] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structural transformation made under the technical concept of the present invention by using the content of the specification and drawings of the present invention, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A range hood, characterized in that: include: A fan, comprising an air outlet and a first air inlet and a second air inlet arranged on two sides of the fan; and A chassis, the chassis has a smoke inlet and a smoke exhaust port, the fan is arranged in the chassis, the air outlet is communicated with the smoke exhaust port, the chassis includes a back plate opposite to one side of the smoke inlet, the fan is spaced from the back plate, and the surface of the back plate close to the second air inlet is recessed in a direction away from the fan to form a clearance groove, and an air passage is formed between the surface of the fan and the groove wall of the clearance groove.

2. The range hood according to claim 1, characterized in that: In the left-right direction of the range hood, the width of the recess is greater than or equal to the width of the fan.

3. The range hood according to claim 1, characterized in that: The bottom wall of the recess is parallel to the outer wall surface of the lower end of the fan close to the second air inlet.

4. The range hood according to claim 1, characterized in that: The clearance groove comprises a lower side wall, the lower side wall exceeds the bottom of the fan, and the lower side wall is inclined downward toward the fan.

5. The range hood according to claim 4, characterized in that: The clearance groove also includes an upper side wall opposite to the lower side wall, and an end of the upper side wall is inclined upward and parallel to the lower edge of the second air inlet.

6. The range hood according to claim 1, characterized in that: The depth of the relief groove is less than or equal to 12 mm.

7. The range hood according to claim 1, characterized in that: The back plate is also provided with a reinforcement structure.

8. The range hood according to claim 7, characterized in that: The reinforcement structure is a plurality of reinforcement grooves formed by depressions on the back plate.

9. The range hood according to claim 8, characterized in that: The depth of the reinforcing grooves is smaller than the depth of the giving way grooves.

10. The range hood according to claim 9, characterized in that: The plurality of reinforcement grooves include two first reinforcement grooves and two second reinforcement grooves, the two first reinforcement grooves are respectively arranged on both sides of the make way groove, and the two second reinforcement grooves are arranged below the make way groove and the second reinforcement groove.

11. The range hood according to claim 10, characterized in that: The reinforcing groove and the giving way groove are both provided with a flow guiding structure, and the flow guiding structure is used to guide the oil to the middle area of ​​the rear back plate.

12. The range hood according to claim 11, characterized in that: The guide structure includes two adjacent groove walls of the first reinforcement groove, the two adjacent groove walls are close to the make way groove and are inclined toward the lower side wall of the make way groove.

13. The range hood according to claim 12, characterized in that: The guide structure further includes a lower side wall of the clearance groove, and the lower side wall of the clearance groove is inclined downward from both ends to the middle in the width direction.

14. The range hood according to claim 13, characterized in that: The chassis includes an upper box body and a smoke collecting hood disposed below the upper box body and connected to the upper box body, the smoke exhaust port is disposed on the upper box body, the back plate is disposed on the smoke collecting hood, the fan includes a volute, and the air outlet is disposed at the upper end of the volute; the first air inlet and the second air inlet are located on opposite sides of the volute; The range hood further comprises a support member, which is arranged on the rear back plate and located below the recess, and supports the lower end of the volute, wherein part of the volute is located in the upper box body and part of the volute is located in the smoke collecting hood.

15. The range hood according to claim 14, characterized in that: The back plate is also provided with a mounting protrusion, the two second reinforcement grooves are located on both sides of the mounting protrusion, and the support member is provided on the mounting protrusion.

16. The range hood according to claim 15, characterized in that: The two side walls of the mounting protrusion are close to each other in the direction toward the bottom of the chassis, and the support member is adapted to the contour of the mounting protrusion.

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