Oil net device and range hood

Abstract

The present application relates to a kind of oil screen device and range hood, oil screen device is arranged at the air inlet of range hood, including the first oil screen and second oil screen sequentially arranged along the airflow direction at air inlet, the elastic reset component includes: fixed seat, relative to the second oil screen fixed;Elastic support component, it is set on the fixed seat, it includes two elastic support arm arranged at an angle;Elastic retaining member, it is set on the fixed seat in a manner that can linearly move relative to the fixed seat, it includes the connecting portion for being connected with the first oil screen and two limit support arms, two limit support arms are oppositely arranged, and the spacing between the two gradually reduces along the first direction;Two elastic support arms of the elastic support component are respectively supported on the inside of two limit support arms of the elastic retaining member, and can be moved along the length direction of the limit support arm by sliding fit or rolling fit.Optimal advantage is that: oil screen device is convenient and quick to disassemble and assemble, and easy to clean.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of range hood, and particularly relates to an oil screen device and a range hood. BACKGROUND

[0002] The range hood is a kind of kitchen appliance for purifying kitchen environment. The range hood usually includes a top suction type and a side suction type. The side suction type range hood utilizes the vortex wind pressure principle to absorb most of the oil fume in an arc form, which is close to the cooking table, so as to reduce the adverse effects on human health, and the power source is close to the cooking table, so as to basically not reduce the suction effect of the power source. The oil screen device is an important component of the range hood, which is used for filtering oil stains. The conventional range hood oil screen is mostly a fixed integrated screen. When the user cooks on one side, the range hood cannot effectively utilize the air volume to effectively suck the oil fume, so that the range hood is prone to smoke when cooking on one side at a small gear, and the noise of the range hood is too large when cooking on one side at a large gear, so that the range hood cannot be efficiently and quietly sucked.

[0003] In order to reasonably distribute the air inlet volume of the air inlet area of the range hood, and effectively utilize the air volume of the range hood to effectively suck the oil fume, the Chinese utility model patent application No. CN202120687387.8 (authorized publication No. CN215570676U) discloses an air inlet assembly and a range hood applying the air inlet assembly. The air inlet assembly includes a panel, a first oil screen is arranged at the air inlet of the panel, the first oil screen has two, one end of each of the two first oil screens is close to each other, the other end of each of the two first oil screens is away from each other, the air inlet assembly further includes a second oil screen, each first oil screen corresponds to a second oil screen, the second oil screen can move away from or close to another second oil screen, each second oil screen can be in a first position and a second position, in the first position, the second oil screen cooperates with the first oil screen to be in an air inlet state of completely opening the air inlet, in the second position, the second oil screen cooperates with the first oil screen to be in a state of partially opening the air inlet. The adjustment of the position of the oil screen is also reset by the compression spring assembly, the body of each compression spring assembly is fixed on one side of the first oil screen facing the inside of the shell, the pressure head of each compression spring assembly respectively abuts against the end part of the two second oil screens away from each other. When the transmission rod drives the cam to rotate in a certain direction, the second oil screen at the corresponding position slides to the corresponding elastic member, so that the elastic member is forced to compress, when the transmission rod reverses, the force of the cam on the second oil screen disappears, then the second oil screen slides to the middle under the action of the restoring force of the elastic member. The flange of the first oil screen is provided with a limiting guide rail, the upper and lower ends of the second oil screen are respectively formed with an insert piece slidingly matched with the limiting guide rail, the limiting guide rail plays a role of sliding guide and limiting for the second oil screen. The limiting guide rail is formed with a limiting guide groove extending left and right, the limiting guide groove penetrates one end of the limiting guide rail of the corresponding first oil screen away from the other first oil screen, and the penetrated end constitutes the entrance of the limiting guide groove.

[0004] However, the air inlet assembly in the above patent application still has some deficiencies. First, the central area of the left and right oil screens is usually provided with a horizontal driving mechanism for pushing the inner oil screen to move horizontally. In order to save installation space, the horizontal driving mechanism is usually a rotary cam or a lever structure acting on the inner side, and the elastic member for resetting the second oil screen is usually a compression spring assembly, from Figure 1The force analysis shows that the force F generated by the pushing rod on the inner oil screen during the circular motion of the pushing rod can be decomposed into a horizontal force F1 and a vertical force F2. The horizontal force F1 drives the inner oil screen to move linearly, and the vertical force F2 causes the inner oil screen to deviate during the movement, increasing the possibility of contact between the inner and outer oil screens, thereby causing the movement to be stuck. For a conventional compression spring reset structure, the deviation in the vertical direction cannot be avoided because there is no structure to suppress or offset the vertical force F2. To solve this problem, an additional linear guide rail needs to be provided for the lateral movement of the inner and outer oil screens. However, the provision of the guide rail assembly makes the assembly and disassembly process of the inner and outer oil screens complex, especially the installation position of the guide rail assembly on the oil screen has a cleaning dead angle, making cleaning difficult. Secondly, the elastic member for resetting and the inner and outer oil screens are located in the air inlet and oil path, which are easy to be contaminated with oil. For a conventional compression spring reset structure, oil contamination accumulated in the spring can cause incomplete or ineffective resetting. For example, if the user uses the left oil screen to absorb and exhaust oil fumes and closes the right oil screen (the spring on the right side is in an elongated state), and sets this state for a long time, such as during a one-month cooking period, regardless of whether the machine is on or off, the inner and outer oil screens on both sides are in this state. In this state, the user cooks, and oil is easily contaminated and accumulated in the spring. When the user wants to use the right side to absorb and exhaust oil fumes (spring reset), the right spring may not reset completely due to oil contamination when the left side is closed, the air inlet on the right side cannot be fully opened, and the structure fails, causing disturbance to the user's cooking experience. SUMMARY

[0005] The first technical problem to be solved by the present application is to provide an oil screen device that is easy to assemble and disassemble and easy to clean.

[0006] The second technical problem to be solved by the present application is to provide an oil screen device that can effectively avoid resetting failure caused by oil accumulation.

[0007] The third technical problem to be solved by the present application is to provide an extractor hood using the above-mentioned oil screen device.

[0008] The technical solution adopted to solve the first and second technical problems is as follows: an oil screen device arranged at an air inlet of an extractor hood, comprising a first oil screen and a second oil screen arranged in sequence along the airflow direction of the air inlet, a first air inlet hole is arranged on the first oil screen, a second air inlet hole is arranged on the second oil screen, the second oil screen is driven by a driving mechanism to move linearly relative to the first oil screen in a first direction, thereby changing the relative position of the second air inlet hole on the second oil screen and the first air inlet hole on the first oil screen.

[0009] The oil network device further comprises an elastic reset assembly capable of acting on the second oil network to make the second oil network have a linear movement relative to the first oil network along a second direction, the second direction being opposite to the first direction, and the elastic reset assembly comprising:

[0010] a fixed seat fixed relative to the second oil network;

[0011] an elastic supporting member provided on the fixed seat and comprising two elastic supporting arms arranged at an included angle;

[0012] an elastic holding member provided on the fixed seat in a manner capable of linearly moving relative to the fixed seat, and comprising a connecting part used for connecting with the first oil network and two limiting supporting arms oppositely arranged and gradually reduced in spacing along the first direction;

[0013] the two elastic supporting arms of the elastic supporting member are respectively located at the inner sides of the two limiting supporting arms of the elastic holding member and are capable of moving along the length direction of the limiting supporting arms in a sliding fit or rolling fit manner.

[0014] during the movement of the second oil network relative to the first oil network along the first direction, the two elastic supporting arms of the elastic supporting member slide relative to the two limiting supporting arms of the elastic holding member and accumulate elastic potential energy by being extruded by the two limiting supporting arms; after the driving mechanism removes the force applied to the second oil network, the two elastic supporting arms of the elastic supporting member release the elastic potential and slide reversely relative to the two limiting supporting arms of the elastic holding member, thereby driving the second oil network to move relative to the first oil network along a second direction, the second direction being opposite to the first direction.

[0015] The oil network device of the present application realizes the reset of the second oil network by using an elastic reset assembly, which comprises an elastic supporting member and an elastic holding member, wherein the two elastic supporting arms of the elastic supporting member are respectively located at the inner sides of the two limiting supporting arms of the elastic holding member and are capable of moving along the length direction of the limiting supporting arms in a sliding fit or rolling fit manner, and during the movement of the two elastic supporting arms of the elastic supporting member along the length direction of the limiting supporting arms and being gradually compressed, the partial force inconsistent with the first direction generated by the driving mechanism (such as a driving by a lever or a cam) acting on the second oil network can be effectively inhibited or counteracted by the two limiting supporting arms of the elastic holding member, thereby reducing or eliminating the offset effect caused by the partial force. On the other hand, the elastic holding member with the two elastic supporting arms is used and the elastic reset is realized by the sliding or rolling fit with the elastic holding member, so that the problem of reset failure of the oil network caused by the accumulation of oil dirt is not easy to occur, and the service life of the elastic reset assembly is prolonged.

[0016] In view of the fact that the direct sliding contact fitting mode may cause jamming problem, resulting in reset delay of the elastic support member, the end of each of the two elastic arms is provided with a roller sleeve, a ball or a roller capable of rolling contact with the inner side of each of the two limiting arms of the elastic retaining member. The rolling fitting structure design can effectively reduce the friction resistance and ensure that the elastic potential energy of the elastic retaining member can be effectively converted.

[0017] In order to realize stable and reliable installation of the roller sleeve, the end of each of the two elastic arms is provided with a bent hook, and the bent hook is provided with a freely rotatable roller sleeve.

[0018] In order to ensure that the two limiting arms of the elastic retaining member can provide good guiding effect, the two limiting arms of the elastic retaining member are plate-shaped, and the roller sleeves on the two elastic arms are respectively rolling fitted on the opposite inner sides of the two limiting arms. The plate-shaped limiting arms can provide a stable guiding plane to ensure that the ends of the elastic arms of the elastic support member can move stably.

[0019] Generally, the elastic support member can be a mechanical element with elastic deformation capacity, such as a torsion spring, a disc spring, a spring steel sheet, etc. In order to reduce the cost, the elastic support member is a torsion spring with two arms, the fixed seat is provided with a positioning shaft for the main body of the torsion spring to rotate around, and the two arms of the torsion spring are the two elastic arms. The standardized torsion spring can effectively reduce the manufacturing cost.

[0020] In order to ensure that the elastic arms of the elastic support member cooperate with the elastic retaining member and avoid interference problem, the ends of the two limiting arms have a gap, and the ends of the two elastic arms pass through the gap and extend into the interior of the elastic retaining member. It is conceivable that the ends of the two limiting arms of the elastic retaining member can also be directly connected and fixed (i.e. without gap), and the elastic arms of the elastic retaining member adopt a bent design structure to solve the interference problem.

[0021] In order to ensure the structural strength and facilitate the quick release connection between the elastic retaining member and the first oil net, the elastic retaining member further comprises a connecting plate connected to the second oil net, the ends of the two limiting arms are connected to the connecting plate, and the connecting plate is provided with a clamping buckle connected to the first oil net as the connecting part.

[0022] In order to ensure the stability of the connection between the elastic retaining member and the first oil screen, and to avoid the elastic retaining member from swinging or shaking, the side of the first oil screen is provided with a first flange folded towards the back surface, the extending direction of the first flange is perpendicular to the moving direction of the second oil screen, the fixing seat is arranged on the back surface of the side of the second oil screen opposite to the first flange, and the connecting plate abuts against the first flange in the state that the connecting plate is clamped on the first flange by the clamping buckle. The surface contact structure design of the connecting plate and the first flange can effectively avoid the problem of the elastic retaining member from swinging or shaking.

[0023] In order to avoid the problem of the elastic retaining member from transversely slipping, and to further ensure the stability of the connection between the elastic retaining member and the first oil screen, the first flange is provided with a limiting boss protruding towards the middle area of the first oil screen, and the connecting plate is provided with a first limiting groove for clamping the limiting boss.

[0024] In order to play a good protection role and reduce the pollution of the internal components by oil, the fixing seat is a shell, the elastic supporting member and the elastic retaining member are arranged in the shell, and the side of the shell is provided with a gap opening for the elastic retaining member to enter and exit.

[0025] In order to further ensure the stability of the relative movement between the first oil screen and the second oil screen, the two sides of the first oil screen parallel to the moving direction of the second oil screen are provided with second flanges folded towards the back surface, the end edges of the two second flanges are provided with limiting stop edges bent towards the middle area of the first oil screen, the limiting stop edges and the corresponding second flanges and the main body of the first oil screen define limiting grooves, and the two sides of the second oil screen parallel to the moving direction of the second oil screen are correspondingly limited in the two limiting grooves.

[0026] In order to facilitate the installation of the second oil screen on the back surface of the first oil screen, at least one side of the second oil screen opposite to the limiting stop edge is provided with an installation gap recessed towards the middle area of the second oil screen for the corresponding limiting stop edge to pass through.

[0027] In order to reduce the friction contact area and ensure the flexibility of the movement of the second oil screen, the two sides of the second oil screen parallel to the moving direction of the second oil screen are provided with third flanges folded towards the back surface, and the third flange of the second oil screen is provided with a supporting protrusion protruding towards the other flange on one of the second flanges of the first oil screen.

[0028] In order to adjust the air volume of the left and right sides of the air inlet to adapt to different cooking conditions of the left and right sides, the first oil screen has a first air inlet area and a second air inlet area arranged in sequence along the moving direction of the second oil screen and uniformly distributed with first air inlet holes, the second oil screen has two and is also arranged in sequence along the moving direction of the second oil screen, one of the second oil screens is opposite to the first air inlet area of the first oil screen, and the other second oil screen is opposite to the second air inlet area of the first oil screen, and the elastic reset assemblies on the two second oil screens are arranged on the two sides of the two second oil screens that are close to each other or far away from each other.

[0029] Generally, the two air inlet areas on the first oil screen can be two areas on an integrated oil screen, or air inlet areas corresponding to two independent sub-oil screens, preferably, the first oil screen comprises two sub-oil screens arranged in sequence along the moving direction of the second oil screen, and the two sub-oil screens correspond to the first air inlet area and the second air inlet area of the first oil screen respectively.

[0030] In order to further reduce the friction contact area between the back of the first oil screen and the front of the second oil screen, and avoid the two from being separated, a plurality of supports for spacing the front side of the second oil screen from the back of the first oil screen are arranged on the first oil screen or the second oil screen, and the first oil screen and the second oil screen are also attracted together by magnetic members.

[0031] The technical solution adopted by the present application to solve the third technical problem is: a range hood, comprising a housing, an air inlet is formed in the housing, and an oil screen is arranged at the air inlet, wherein the oil screen adopts the oil screen device described above.

[0032] Compared with the prior art, the oil screen device of the present application uses an elastic reset assembly to reset the second oil screen, which comprises an elastic support member and an elastic retaining member, wherein the two elastic arms of the elastic support member are respectively abutted on the inner sides of the two limiting arms of the elastic retaining member, and can move along the length direction of the limiting arm in a sliding or rolling manner, in the process of gradually compressing the two elastic arms of the elastic support member along the length direction of the limiting arm, the component force generated by the driving mechanism (such as a lever or cam driving) acting on the second oil screen in a direction inconsistent with the first direction can be effectively inhibited or counteracted by the two limiting arms of the elastic retaining member, thereby reducing or eliminating the offset effect caused by the component force. On the other hand, the elastic retaining member with two elastic arms is used, and the elastic reset is realized by sliding or rolling with the elastic retaining member, so that the problem of oil screen reset failure caused by oil accumulation is not easy to occur, and the service life of the elastic reset assembly is prolonged. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1It is a force analysis diagram of the inner oil screen (second oil screen) of the oil screen device during movement;

[0034] Figure 2 It is a perspective structure diagram of the oil screen device of the embodiment of the present application;

[0035] Figure 3 It is a perspective structure diagram of the oil screen device of the embodiment of the present application from another angle;

[0036] Figure 4 It is an exploded view of the oil screen device of the embodiment of the present application;

[0037] Figure 5 It is a perspective structure diagram of the elastic reset device of the embodiment of the present application;

[0038] Figure 6 It is an exploded view of the elastic reset device of the embodiment of the present application;

[0039] Figure 7 It is a perspective structure diagram of the oil screen device of the embodiment of the present application (torsion spring is in compressed state);

[0040] Figure 8 It is a perspective structure diagram of the oil screen device of the embodiment of the present application after the first oil screen is removed (the shell body of the fixing seat is in separated state);

[0041] Figure 9 It is a perspective structure diagram of the oil screen device of the embodiment of the present application (second oil screen is in one state during installation, not abutting against the back of the first oil screen);

[0042] Figure 10 It is a perspective structure diagram of the elastic reset device of the embodiment of the present application after the cover is removed;

[0043] Figure 11 It is a sectional perspective view of the oil screen device of the embodiment of the present application along the width direction thereof. DETAILED DESCRIPTION

[0044] The present application is described in further detail below in combination with the embodiment of the drawings.

[0045] The terms denoting orientation, such as "front", "back", "upper", "lower", "left", "right", "side", "top", "bottom", and the like, are used in the description and claims of the present application to describe various example structural parts and elements of the present application, but are used only for the purpose of convenience in describing the present application and are determined based on the example orientation shown in the drawings. Since the embodiments disclosed in the present application can be arranged in different directions, these terms denoting orientation are only for illustration and should not be considered as limiting, such as "upper" and "lower" are not necessarily limited to the direction opposite or consistent with the direction of gravity.

[0046] Figures 1-11 A preferred embodiment of the oil screen device and the range hood using the same is shown. The range hood comprises a casing and a centrifugal fan arranged in the casing, the casing generally comprises a fan frame and a hood arranged at the bottom of the fan frame, the inner cavity of the fan frame is communicated with the inner cavity of the hood. The front side wall of the hood is provided with an air inlet, and external smoke gas can enter the hood through the air inlet. The centrifugal fan is arranged in the fan frame, and the centrifugal fan generates negative pressure when operating, so that external oil fume can be sucked into the hood through the air inlet. The air inlet of the hood is also provided with an oil screen device for filtering oil fume.

[0047] The front and back angle perspective structural schematic diagrams of the oil screen device of the embodiment are shown in Figure 2 and Figure 3 The oil screen device comprises a first oil screen 21 and a second oil screen 31 arranged at the back of the first oil screen 21, and the two are arranged in sequence along the airflow direction at the air inlet. The first oil screen 21 is provided with first air inlets 210, and the second oil screen 31 is provided with second air inlets 310, wherein the air inlets of the two are strip-shaped holes with consistent extension direction.

[0048] Referring to Figure 2 , the first oil screen 21 has two air inlet areas arranged in sequence, which are a first air inlet area 211 and a second air inlet area 212, and the two air inlet areas are both distributed with first air inlets 210. The second oil screen 31 is provided with two, which are arranged along the first direction A1, one of which corresponds to the first air inlet area 211 of the first oil screen 21, and the other corresponds to the second air inlet area 212. Specifically, the first oil screen 21 comprises two sub-oil screens 21a, which form the first air inlet area 211 and the second air inlet area 212 respectively. The second oil screen 31 can move linearly relative to the first oil screen 21 along the first direction A1 through a driving mechanism, so that the overlapping area of the second air inlets 310 and the first air inlets 210 changes, thereby realizing the adjustment of the air inlet air volume.

[0049] Each sub-oil screen 21a of the first oil screen 21 and the corresponding second oil screen 31 constitute an oil screen unit. Two symmetrical oil screen units are adopted in the embodiment to form the whole device by splicing. The second oil screens 31 of the two oil screen units can be independently moved to adapt to different cooking conditions on the left and right sides of the range hood. The driving mechanism is usually arranged at the joint area of the two oil screen units, and the motion control can be realized by using the existing technology of driving motor and lever or cam transmission.

[0050] Referring to Figure 7 Taking a single oil screen unit as an example, the first oil screen 21 and the second oil screen 31 are both square structures, and the size of the second oil screen 31 is slightly smaller than that of the first oil screen 21. The sub-oil screen 21a of the first oil screen 21 is provided with a first folded edge 221 on both sides in the first direction A1, which is folded towards the second oil screen 31, and the extension direction is perpendicular to the first direction A1. The two sides perpendicular to the first direction A1 are provided with a second folded edge 222, and the extension direction is parallel to the first direction A1. The end edges of the two second folded edges 222 are provided with a limiting stop edge 223 which is folded towards the middle area of the first oil screen 21. Each limiting stop edge 223 and the corresponding second folded edge 222 and the main body of the first oil screen 21 define a limiting groove 220, and the two sides of the second oil screen 31 parallel to the moving direction are correspondingly limited in the two limiting grooves 220. This structure design helps to enhance the support and flow guiding functions of the oil screen, while ensuring the stable movement of the second oil screen 31 on the back. The outer periphery of the second oil screen 31 also has a third folded edge 33 which is folded towards the back. The inner side of the second folded edge 222 of the first oil screen 21 (i.e. the side towards the third folded edge 33 of the second oil screen 31) has a support protrusion 24 which protrudes towards the second oil screen 31. The support protrusion 24 has a plurality of arc-shaped curved surface structures arranged in sequence along the length direction of the second folded edge 222. The outer side of the third folded edge 33 of the second oil screen 31 is in contact with the support protrusion 24 on the second folded edge 222 of the first oil screen 21, which reduces the friction contact area between the two oil screen folded edges and ensures the flexibility of the movement of the second oil screen 31.

[0051] Referring to Figure 9 In order to facilitate the installation of the second oil screen 31 on the back of the first oil screen 21, at least one side of the second oil screen 31 opposite to the limiting stop edge 223 has an installation gap 32 which is recessed towards the middle area of the second oil screen 31 for the corresponding limiting stop edge to pass through.

[0052] One of the two sides of the second oil screen 31 in the moving direction of the second oil screen can cooperate with the driving mechanism, and the other side is provided with a resilient reset assembly 4. The resilient reset assembly 4 includes a fixed seat 41, a resilient support member 42 and a resilient retaining member 43.

[0053] The fixing base 41 can be fixed on the back of the second oil screen 31 by screws. The fixing base 41 is a cuboid-shaped housing, which comprises a housing body 411 with an open mouth and a cover body 412 connected to the open mouth of the housing body 411 by a snap structure. The torsion spring and the elastic retaining member 43 described above are both arranged in the housing. The housing is provided with a clearance opening 410 on the wall surface of the side part facing the first flange 221 of the first oil screen 21, and the elastic retaining member 43 can enter and exit the housing through the clearance opening 410. The elastic supporting member 42 is a standardized double-branch torsion spring, the main body of which is sleeved on a positioning shaft 413 on the fixing base 41, and the two branches are arranged at a V-shaped angle, the end part is provided with a bent hook 4210, and a rotatable roller sleeve 422 is installed on the bent hook 4210. The extension direction of the positioning shaft 413 on the fixing base 41 is basically perpendicular to the plane where the second oil screen 31 or the first oil screen 21 is located, that is, the plane formed by the swing path of the torsion spring is basically parallel to the first oil screen 21 or the second oil screen 31. The arrangement of the roller sleeve 422 on the branch of the torsion spring is to keep the balance of the two sides of the torsion spring, and to reduce the friction between the torsion spring and the limiting branch 431 of the elastic retaining member 43 during the movement of the second oil screen 31. The elastic retaining member 43 comprises a connecting plate 432 and two limiting branches 431, the limiting branches 431 are plate-shaped structures, and the distance between the two limiting branches 431 gradually decreases along the first direction A1. The two end parts of the connecting plate 432 are connected to the end parts of the two limiting branches 431. The extension direction of the connecting plate 432 is parallel to the first flange 221 of the first oil screen 21, and the middle region of the length direction of the connecting plate 432 is provided with a clamping buckle 433 for detachable connection with the first flange 221 of the first oil screen 21. The connecting plate 432 abuts against the first flange 221. The first flange 221 is provided with a limiting boss 23 protruding (towards the middle region of the first oil screen 21) at the middle part, and a first limiting groove 434 is formed in the connecting plate 432 corresponding to the limiting boss 23. A clamping groove is formed on the first flange 221 corresponding to the position of the limiting boss 23, which can be formed by stamping. The clamping buckle 433 of the connecting plate 432 is clamped in the clamping groove in the first flange 221, and the clamping buckle 433 is not too protruding relative to the outer wall surface of the first flange 221, and at the same time, the limiting boss 23 of the first flange 221 is clamped into the first limiting groove 434 of the connecting plate 432, thereby limiting in the width direction of the oil screen (i.e. the length direction of the first flange 221).

[0054] To ensure the elastic support member 42 and the elastic support member 43 are matched and avoid interference, the two limiting arms 431 have a gap 4310 between the ends, and the two elastic arms 421 extend into the interior of the elastic retaining member 43 through the gap 4310. When installed, the inner side of the two limiting arms 431 of the elastic retaining member 43 is in rolling contact with the roller sleeve 422 of the torsion spring. When the driving mechanism (such as a lever) pushes the second oil screen 31 to move in the first direction A1, the roller sleeve 422 rolls along the limiting arm 431, and the two arms of the torsion spring are pressed to accumulate elastic potential energy, and at the same time, the limiting arm 431 suppresses the vertical component force to avoid the second oil screen 31 from deviating. After the driving mechanism removes the force applied to the second oil screen 31, the torsion spring releases the potential energy to drive the second oil screen 31 to return to the original position.

[0055] The interior of the fixed seat 41 is also provided with a first limiting block 414 adjacent to the position where the main body of the torsion spring is located, which is used to limit the rotation of the torsion spring around the positioning shaft 413. The first limiting block 414 is a split limiting block, which abuts against the roots of the two elastic arms 421 of the torsion spring. Of course, the first limiting block can also be an integral part, which defines a corresponding V-shaped notch, and the two sides of the V-shaped notch abut against the roots of the two elastic arms 421 of the torsion spring to limit the rotation of the torsion spring. The interior of the fixed seat 41 is also provided with a second limiting block 415, which can be two second limiting blocks arranged at intervals. In the state that the elastic retaining member 43 is retracted into the fixed seat 41 (i.e., the storage state), the two sides of the two limiting arms 431 of the elastic retaining member 43, which are away from each other, abut against the two second limiting blocks respectively, so that the elastic retaining member 43 is kept in a relatively stable state.

[0056] The elastic return assembly 4 cooperates with the limiting arm 431 through rolling contact to effectively suppress the vertical component force generated during the movement of the second oil screen 31 driven by the driving mechanism, thereby avoiding the problem of deviation and jamming of the second oil screen 31. The use of standardized components such as torsion springs and spring steel sheets reduces costs, and the use of structures such as roller sleeves 422 and balls reduces frictional resistance. The cooperation of the clamping buckle 433 and the limiting boss 23 realizes the quick release function and facilitates cleaning. The double-oil-screen partition design is suitable for different cooking scenes and improves the efficiency of smoke extraction. Those skilled in the art can adjust the material of the elastic support member 42, the inclination angle of the limiting arm 431, or use other driving methods (such as direct driving by a motor) according to the above embodiments, which all fall within the protection scope of the present application.

[0057] Referring to Figure 11 The second oil screen 31 is also provided with a plurality of supporting members 34 for spacing the front side of the second oil screen 31 from the back of the first oil screen 21, and the supporting members 34 can be integrally formed with the second oil screen 31 by means of hot melting. Figure 3As shown, two rows of supports 34 are placed between the second oil mesh 31 and the first oil mesh 21, with 4 supports in each row. The first oil mesh 21 and the second oil mesh 31 are also attracted together by magnetic members 35. Specifically, two additional magnets are provided in the upper row (as shown in the upper row in Figure 3 ) of supports 34 on the second oil mesh 31, adjacent to the side on which the mounting gap 32 is located, for attracting the first oil mesh 21. As shown, magnets are additionally provided at the positions of the upper left and upper right supports 34 of the second oil mesh 31, for attracting the upper end of the second oil mesh 31. The lower end of the second oil mesh 31 is limited by the limiting flange 223 of the first oil mesh 21, thereby solving the risk of the lower end falling off without a magnet. Figure 3

[0058] Taking the right oil mesh unit as an example, the operation process of mounting the second oil mesh 31 to the first oil mesh 21 is as follows: first, the lower end of the second oil mesh 31 is inserted obliquely downward into the lower end of the first oil mesh 21, and then the rightmost side of the second oil mesh 31 is brought into abutment with the first flange 221 of the first oil mesh 21; the second oil mesh 31 is then flipped downward (the flipping direction is shown by the S direction in Figure 9 ), and the upper end of the second oil mesh 31 is attracted to the first oil mesh 21 by the magnets. The clamping buckle 433 of the elastic reset assembly 4 is buckled into the first flange 221 of the first oil mesh 21 during the flipping of the second oil mesh 31, and at this time the second oil mesh 31 and the first oil mesh 21 are fixedly mounted. The operation method for dismounting the second oil mesh 31 from the first oil mesh 21 is opposite to the above: the user holds the upper end of the second oil mesh 31 and lifts it upward, so that the magnets of the upper end of the second oil mesh 31 are separated from the first oil mesh 21; during the upward flipping of the second oil mesh 31, the clamping buckle 433 of the reset assembly is separated from the first flange, so that the second oil mesh 31 is separated from the first oil mesh 21. Then the second oil mesh 31 is taken out obliquely upward, and the dismounting is completed.

[0059] ​On the basis of the above embodiments, other embodiments can be obtained by replacing and improving the related technical features. For example, the elastic support member 42 is not limited to a torsion spring, and a spring sheet, such as a steel sheet, can be used. The two elastic support arms 421 are made of spring steel sheet, and the end is provided with a ball. The inner side of the limiting arm 431 of the elastic retaining member 43 is provided with a guide groove, and the ball is embedded in the groove and rolls, thereby reducing the friction resistance. The driving mechanism adopts a cam structure. When the cam rotates, it pushes the second oil screen 31 to move, the spring steel sheet is deformed under pressure, and after the cam returns, the spring steel sheet drives the second oil screen 31 to move in the opposite direction. For another example, the setting position of the support protrusion 24 can be interchanged between the second flange 222 of the first oil screen 21 and the third flange 33 of the second oil screen 31, that is, the support protrusion 24 is arranged on the third flange 33 of the second oil screen 31 and in sliding contact with the second flange 222 of the first oil screen 21, thereby reducing the friction area and improving the smoothness of movement. For another example, the support member 34 and the magnet can also be arranged on the first oil screen 21, and are not limited to being arranged on the second oil screen 31.

Claims

1. An oil mesh device, arranged at the air inlet of a range hood, comprising a first oil mesh (21) and a second oil mesh (31) arranged sequentially along the airflow direction at the air inlet, wherein the first oil mesh (21) is provided with a first air inlet hole (210) and the second oil mesh (31) is provided with a second air inlet hole (310), wherein the second oil mesh (31) is driven by a driving mechanism to move linearly relative to the first oil mesh (21) along a first direction (A1), thereby changing the relative position of the second air inlet hole (310) on the second oil mesh (31) and the first air inlet hole (210) on the first oil mesh (21); Its features It also includes an elastic reset component (4) that acts on the second oil mesh (31) to cause the second oil mesh (31) to move linearly relative to the first oil mesh (21) along a second direction (A2), wherein the second direction (A2) and the first direction (A1) are opposite directions, and the elastic reset component includes: The fixing seat (41) is fixed relative to the second oil mesh (31); An elastic support member (42) is provided on the fixed base (41), which includes two elastic arms (421) arranged at an included angle; An elastic retaining member (43) is provided on the fixed base (41) in such a way that it can move linearly relative to the fixed base (41). It includes a connecting part for connecting with the first oil mesh (21) and two limiting arms (431). The two limiting arms (431) are arranged opposite to each other, and the distance between them gradually decreases along the first direction (A1). The two elastic arms (421) of the elastic support member (42) abut against the inner sides of the two limiting arms (431) of the elastic retaining member (43), and can move along the length direction of the limiting arms (431) by means of sliding or rolling engagement.

2. The oil mesh device according to claim 1, characterized in that: The ends of the two elastic arms (421) are provided with roller sleeves (422), balls or rollers that can respectively roll into contact with the inner side of the two limiting arms (431) of the elastic retaining member (43).

3. The oil mesh device according to claim 2, characterized in that: The ends of the two elastic arms (421) have bend hooks (4210), and the bend hooks (4210) are provided with freely rotatable roller sleeves (422).

4. The oil mesh device according to claim 3, characterized in that: The two limiting arms (431) of the elastic retaining member (43) are plate-shaped, and the roller sleeves (422) on the two elastic arms (421) are respectively rolled and engaged on the opposite inner surfaces of the two limiting arms (431).

5. The oil mesh device according to claim 1, characterized in that: The elastic support member (42) is a torsion spring with two arms. The fixed base (41) is provided with a positioning shaft (413) on which the main body of the torsion spring is rotatably sleeved. The two arms of the torsion spring are the two elastic arms (421).

6. The oil mesh device according to claim 1, characterized in that: There is a gap (4310) between the ends of the two limiting arms (431), and the ends of the two elastic arms (421) extend into the interior of the elastic retaining member (43) through the gap (4310).

7. The oil mesh device according to claim 1, characterized in that: The elastic retaining member (43) further includes a connecting plate (432) for connecting to the second oil mesh (31), the ends of the two limiting arms (431) are connected to the connecting plate (432), and the connecting plate (432) is provided with a clamping buckle (433) for detaching connection with the first oil mesh (21) as the connecting part.

8. The oil mesh device according to claim 7, characterized in that: The side of the first oil mesh (21) has a first flange (221) folded towards the back. The extension direction of the first flange (221) is perpendicular to the moving direction of the second oil mesh (31). The fixing seat (41) is provided on the back of the side of the second oil mesh (31) opposite to the first flange (221). When the connecting plate (432) is clamped on the first flange (221) by the clamping buckle (433), the connecting plate (432) and the first flange (221) abut against each other.

9. The oil mesh device according to claim 8, characterized in that: The first flange (221) is provided with a limiting boss (23) protruding toward the middle region of the first oil mesh (21), and the connecting plate (432) is provided with a first limiting groove (434) for the limiting boss (23) to be inserted into.

10. The oil mesh device according to any one of claims 1 to 9, characterized in that: The fixed base (41) is a housing, and the elastic support member (42) and the elastic retaining member (43) are both provided inside the housing. The side of the housing is provided with a clearance opening (410) for the elastic retaining member (43) to enter and exit.

11. The oil mesh device according to any one of claims 1 to 9, characterized in that: The first oil mesh (21) has two sides parallel to the moving direction of the second oil mesh (31) with a second flange (222) folded towards the back. The end edges of the two second flanges (222) have a limiting stop (223) bent towards the middle area of ​​the first oil mesh (21). Each limiting stop (223) defines a limiting groove (220) between the corresponding second flange (222) and the main body of the first oil mesh (21). The two sides of the second oil mesh (31) parallel to its moving direction are correspondingly limited in the two limiting grooves (220).

12. The oil mesh device according to claim 11, characterized in that: At least one side of the second oil mesh (31) opposite to the limiting stop (223) has an installation notch (32) that is recessed toward the central region of the second oil mesh (31) so that the corresponding limiting stop can pass through.

13. The oil mesh device according to claim 11, characterized in that: The second oil mesh (31) has two sides parallel to the direction of movement of the second oil mesh (31) with a third flange (33) folded toward the back. The third flange (33) of the second oil mesh (31) and one of the flanges (222) of the first oil mesh (21) have a support protrusion (24) protruding toward the other flange.

14. The oil mesh device according to any one of claims 1 to 9, characterized in that: The first oil mesh (21) has a first air inlet area (211) and a second air inlet area (212) arranged sequentially along the moving direction of the second oil mesh and each having a first air inlet hole (210). There are two second oil meshes (31), which are also arranged sequentially along the moving direction of the second oil mesh. One second oil mesh (31) is opposite to the first air inlet area (211) of the first oil mesh (21), and the other second oil mesh (31) is opposite to the second air inlet area (212) of the first oil mesh (21). The elastic reset components (4) on the two second oil meshes (31) are arranged on the two sides of the two second oil meshes (31) that are close to or far from each other.

15. The oil mesh device according to claim 14, characterized in that: The first oil mesh (21) includes two sub-oil meshes (21a) arranged sequentially along the moving direction of the second oil mesh. The two sub-oil meshes (21a) correspond to the first air inlet area (211) and the second air inlet area (212) of the first oil mesh (21), respectively.

16. The oil mesh device according to any one of claims 1 to 9, characterized in that: The first oil mesh (21) or the second oil mesh (31) is also provided with a plurality of support members (34) for separating the front side of the second oil mesh (31) from the back side of the first oil mesh (21). The first oil mesh (21) and the second oil mesh (31) are also attracted together by magnetic members (35).

17. A range hood, comprising a housing, an air inlet on the housing, and an oil filter at the air inlet, characterized in that: The oil mesh is the oil mesh device according to any one of claims 1 to 16.

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