Check valve structure and range hood air box

Abstract

The present application relates to the technical field of fume extraction equipment, and in particular to a check valve structure and a fume extractor air box. The check valve structure includes a check valve body, and the check valve body includes a valve ring part and a valve seat part; an air flow channel is formed inside the valve ring part, the bottom of the valve ring part is connected to the valve seat part, and the air flow channel extends from the top end to the bottom end of the valve ring part and penetrates the valve seat part; a plurality of sound-absorbing through holes arranged in an array are formed on the side wall surface of the valve ring part, and the valve seat part is provided with an annular oil-blocking member surrounding the valve ring part and forming a space with the valve ring part, so that an oil collecting part is formed between the valve seat part and the valve ring part by the annular oil-blocking member, and an oil discharge through hole is formed in the oil collecting part. The fume extractor air box includes this check valve structure. The check valve structure and the fume extractor air box can effectively reduce noise during the exhaust process through the sound-absorbing through holes, timely and directionally process the oil droplets oozing through the sound-absorbing through holes, avoid oil droplet pollution to the fume extractor, and effectively improve the cleanliness and safety of the fume extractor.

Description

Technical Field

[0001] This application relates to the technical field of oil fume extraction equipment, and more particularly to a check valve structure and an oil fume extractor air box. Background Art

[0002] Oil fume extraction equipment is a commonly used electrical appliance for purifying the kitchen cooking environment. During use, in order to prevent the discharged flue gas from flowing back, a check valve structure is usually adopted.

[0003] However, currently, the noise generated during the exhaust operation of oil fume extraction equipment has become a major source of kitchen noise pollution. Summary of the Invention

[0004] The purpose of this application is to provide a check valve structure and an oil fume extractor air box to solve to a certain extent the technical problem of serious noise pollution during the exhaust operation of the existing oil fume extractor.

[0005] This application provides a check valve structure, including a check valve body, and the check valve body includes a valve ring part and a valve seat part;

[0006] An air flow channel is formed inside the valve ring part, the bottom of the valve ring part is connected to the valve seat part, and the air flow channel extends from the top end to the bottom end of the valve ring part and penetrates through the valve seat part;

[0007] A plurality of sound-absorbing through holes arranged in an array are formed on the side wall surface of the valve ring part, and the valve seat part is provided with an annular oil-blocking member surrounding the valve ring part and forming a gap with the valve ring part, so that an oil collecting part is formed between the annular oil-blocking member and the valve ring part of the valve seat part, and an oil drainage through hole is formed in the oil collecting part.

[0008] In the above technical solution, further, the check valve structure further includes a surrounding plate member and a sound-absorbing layer;

[0009] The bottom end of the surrounding plate member is arranged in the oil collecting part, an outward expansion part is arranged on the outer wall of the top of the valve ring part, the top end of the surrounding plate member abuts against the bottom end of the outward expansion part, and the sound-absorbing layer is filled between the outer side wall of the valve ring part and the surrounding plate member.

[0010] In any of the above technical solutions, further, the valve seat part is provided with an installation ring groove surrounding the valve ring part, and the bottom end of the surrounding plate member is inserted into the installation ring groove.

[0011] In any of the above technical solutions, further, the check valve structure further includes a first sealing member, and the first sealing member is sealingly connected between the bottom end of the surrounding plate member and the installation ring groove;

[0012] The check valve structure further includes a second sealing member, which is sealingly connected between the top of the surrounding plate member and the bottom end of the outwardly expanding portion.

[0013] In any of the above technical solutions, further, the surrounding plate member includes a plurality of sub-surrounding plates sequentially connected in a surrounding manner;

[0014] Along the circumferential direction of the valve ring portion, both ends of each of the sub-surrounding plates are provided with lugs, and every two adjacent sub-surrounding plates are detachably connected through the lugs.

[0015] In any of the above technical solutions, further, the oil collecting portion is provided with a sunken oil collecting groove, and the oil discharge through hole is opened in the oil collecting groove.

[0016] In any of the above technical solutions, further, oil collecting grooves are respectively provided on two opposite side portions of the surrounding plate member.

[0017] In any of the above technical solutions, further, the oil collecting portion is provided with a first drainage portion located between the surrounding plate member and the oil collecting groove, and the first drainage portion gradually inclines downward from the valve ring portion to the oil collecting groove;

[0018] The oil collecting portion is provided with a second drainage portion. One end of the second drainage portion along the circumferential direction of the valve ring portion is adjacent to the oil collecting groove, and the second drainage portion gradually inclines downward along the circumferential direction of the valve ring portion to the oil collecting groove.

[0019] This application also provides an oil fume exhaust cabinet, including a cabinet body and the check valve structure according to any of the above technical solutions;

[0020] The cabinet body includes a top plate, and an air outlet through hole is opened in the top plate;

[0021] The valve seat portion of the check valve structure is arranged on the top plate, and the air outlet through hole corresponds to the inside of the valve ring portion of the check valve structure;

[0022] An oil leakage hole is opened in the top plate, and the oil discharge through hole communicates with the inside of the cabinet body through the oil leakage hole.

[0023] In any of the above technical solutions, further, an oil collecting groove is formed on the top plate, the oil collecting groove protrudes in a direction away from the top plate and corresponds to the oil discharge through hole, and the oil leakage hole is opened at the bottom of the oil collecting groove;

[0024] A third sealing member is clamped between the top surface of the top plate and the bottom surface of the valve seat portion, and the third sealing member is at least arranged around the oil collecting groove.

[0025] Compared with the prior art, the beneficial effects of this application are:

[0026] The check valve structure provided by this application includes a check valve body. The check valve body includes a valve ring part and a valve seat part. An air flow channel is formed inside the valve ring part. The bottom of the valve ring part is connected to the valve seat part. The air flow channel extends from the top end to the bottom end of the valve ring part and penetrates the valve seat part. Thus, on the premise that the valve seat part supports the valve ring part, flue gas can pass through the valve seat part and flow into the inside of the valve ring part. Furthermore, the flue gas check structure arranged inside the valve ring part is used to prevent the flue gas from flowing back.

[0027] A plurality of sound-absorbing through holes arranged in an array are formed on the side wall surface of the valve ring part. Thus, the wind noise generated by the flue gas in the air flow channel inside the valve ring part is weakened through the plurality of sound-absorbing through holes, so as to achieve the purpose of effectively reducing noise during the exhaust process.

[0028] Since there are pollutants such as oil stains in the flue gas, it is easy to occur the situation that oil leaks to the outside of the valve ring part through the sound-absorbing through holes. The leaked oil stains drip into the valve seat part. By arranging an annular oil retaining member on the valve seat part that surrounds the valve ring part and forms a gap with the valve ring part, an oil collecting part is formed between the valve seat part and the valve ring part by the annular oil retaining member, so that the oil droplets are restricted on the oil collecting part. The oil collecting part is provided with an oil drain through hole. Thus, the oil droplets are concentrated and directionally discharged through the oil drain through hole, which is convenient for cleaning the check valve body.

[0029] Therefore, this check valve structure can not only effectively reduce noise during the exhaust process through the sound-absorbing through holes, but also timely and directionally process the oil droplets oozing out through the sound-absorbing through holes, avoiding oil droplet pollution to the appearance of the range hood or electronic components such as the power board using this check valve structure. Further, it can effectively maintain the cleanliness and safety of the range hood using this check valve structure.

[0030] The range hood air box provided by this application includes the above-mentioned check valve structure, so all the beneficial effects of this check valve structure can be achieved.

[0031] In addition, this range hood air box further includes an air box body. The air box body includes a top plate. The valve seat part of the check valve structure is arranged on the top plate. The top plate is provided with an oil leakage hole. The oil drain through hole communicates with the inside of the air box body through the oil leakage hole. Thus, the oil liquid directionally discharged through the oil drain through hole falls into the oil leakage hole, and then flows into the inside of the air box body through the oil leakage hole, rather than dropping and staying on the top plate, ensuring the cleanliness of the top plate. Description of the Drawings

[0032] To more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0033] Figure 1 The first structural schematic diagram of the air duct of the range hood provided in the second embodiment of the present application;

[0034] Figure 2 The second structural schematic diagram of the air duct of the range hood provided in the second embodiment of the present application;

[0035] Figure 3 For Figure 2 The partial enlarged view at A;

[0036] Figure 4 The third structural schematic diagram of the air duct of the range hood provided in the second embodiment of the present application;

[0037] Figure 5 For Figure 4 The partial enlarged view at B;

[0038] Figure 6 For Figure 4 The partial enlarged view at C;

[0039] Figure 7 The third structural schematic diagram of the air duct of the range hood provided in the second embodiment of the present application;

[0040] Figure 8 For Figure 7 The top view of;

[0041] Figure 9 For Figure 7 The partial enlarged view at D.

[0042] Reference numerals:

[0043] 10 - Check valve body; 100 - Valve ring part; 1000 - Outer expansion part; 1001 - Sound absorption through hole; 101 - Valve seat part; 1010 - Oil collection part; 1011 - Oil collection groove; 1012 - Oil drainage through hole; 1013 - First drainage part; 1014 - Second drainage part; 1015 - Annular oil blocking member; 1016 - Connection hole; 11 - Enclosure member; 110 - Sub - enclosure; 111 - Support ear; 12 - Sound absorption layer; 13 - First sealing member; 14 - Second sealing member; 20 - Top plate; 200 - Oil collecting groove; 201 - Oil leakage hole; 21 - Chassis; 22 - Third sealing member. Detailed embodiments

[0044] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative work shall fall within the protection scope of the present invention.

[0045] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0046] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0047] Embodiment 1

[0048] Combined with Figures 1 to 9 As shown, the embodiment of the present application provides a check valve structure for a range hood to prevent the flue gas in the common flue or the flue pipe from flowing back into the room.

[0049] The check valve structure provided in this embodiment includes a check valve body 10, a shroud member 11, and a sound-absorbing layer 12.

[0050] In the following, the above components of the check valve structure will be specifically described.

[0051] In an alternative solution of this embodiment, the check valve body 10 includes a valve ring portion 100 and a valve seat portion 101.

[0052] Among them, the valve ring part 100 has a cylindrical structure. An air flow channel is formed inside the valve ring part 100. The top of the valve ring part 100 is used to communicate directly or indirectly with a common flue. The bottom of the valve ring part 100 is connected to the valve seat part 101. The air flow channel extends from the top end to the bottom end of the valve ring part 100 and penetrates the valve seat part 101. Thus, on the basis that the valve seat part 101 supports the valve ring part 100, the flue gas can be discharged unidirectionally through the valve seat part 101 and the valve ring part 100 in sequence.

[0053] Optionally, both the valve ring part 100 and the valve seat part 101 are made of plastic material and are integrally formed. Thus, there will be no flue gas leakage at the connection between the valve ring part 100 and the valve seat part 101, that is, there will be no oil leakage.

[0054] Optionally, the valve ring part 100 can be cylindrical, prismatic, frustum-shaped, or have a shape with a gradually shrinking cross-section and a curved axis, etc. The specific shape can be determined according to factors such as the installation space, the flow rate of the air flow, and the wind resistance.

[0055] A plurality of sound-absorbing through holes 1001 are arranged in an array on the side wall surface of the valve ring part 100. Thus, the wind noise generated by the flue gas flowing in the air flow channel is reduced through the sound-absorbing through holes 1001.

[0056] Optionally, the plurality of sound-absorbing through holes 1001 are arranged in an array on the side wall surface of the valve ring part 100, so that the sound-absorbing and noise-reducing effects of the sound-absorbing through holes 1001 are evenly distributed along the circumferential direction of the valve ring part 100.

[0057] The valve seat part 101 is provided with an annular oil-blocking member 1015 that surrounds the valve ring part 100 and forms a gap with the valve ring part 100, so that the valve seat part 101 forms an oil-collecting part 1010 between the annular oil-blocking member 1015 and the valve ring part 100. The oil-collecting part 1010 is provided with an oil-draining through hole 1012.

[0058] Optionally, the valve seat part 101 is provided with a plurality of connecting holes 1016, so as to facilitate connecting the valve seat part 101 to a component acting as a frame through the connecting holes 1016, and further fixing the check valve body 10 to the component acting as a frame.

[0059] Specifically, the flue gas carries cooking oil fume, and the cooking oil fume will leak out through the sound-absorbing through holes 1001. By providing the annular oil-blocking member 1015, the oil droplets leaking out can be limited in the oil-collecting part 1010. The collected oil droplets can be discharged directionally through the oil-draining through hole 1012. Thus, not only can it be avoided that the leaked oil liquid pollutes the range hood, especially the top plate 20 of the air box body of the range hood used for installing the check valve body 10, but also it can be avoided that the oil stains accumulate excessively in the oil-collecting part 1010, improving the cleanliness of the oil-collecting part 1010.

[0060] Optionally, the annular oil baffle member 1015 can be in the shape of a flanging or a protrusion.

[0061] Optionally, the surface of the oil collecting part 1010 is coated with a hydrophobic and oleophobic coating.

[0062] In this embodiment, the bottom end of the baffle member 11 is disposed on the oil collecting part 1010, and an outward expanding part 1000 is formed at the top of the valve ring part 100, so as to form a shoulder between the bottom end of the outward expanding part 1000 and the other parts of the valve ring part 100.

[0063] The top end of the baffle member 11 abuts against the bottom end of the outward expanding part 1000, so as to form a limit in the vertical direction c for the top of the baffle member 11 through the outward expanding part 1000, and form a limit in the vertical direction c for the bottom of the baffle member 11 through the oil collecting part 1010, thereby making the baffle member 11 fixed relative to the check valve body 10.

[0064] The sound-absorbing layer 12 is filled between the outer side wall of the valve ring part 100 and the baffle member 11. Thus, on the one hand, the sound-absorbing layer 12 is clamped and fixed by the baffle member 11 and the valve ring part 100, and the noise transmitted through the sound-absorbing through holes 1001 is absorbed and weakened by the sound-absorbing layer 12; on the other hand, the outer peripheral wall surface of the sound-absorbing layer 12 can be shielded by the baffle member 11, so as to block oil stains, and the oil stains are limited between the baffle member 11 and the valve ring part 100; on the third hand, the baffle member 11 is used to seal a plurality of sound-absorbing through holes 1001, ensuring that the valve ring part 100 does not leak pressure.

[0065] Optionally, the material of the sound-absorbing layer 12 is sound-absorbing cotton.

[0066] In this embodiment, the oil collecting part 1010 is provided with a concave oil collecting groove 1011, and the oil discharge through hole 1012 is opened in the oil collecting groove 1011. Since the height of the oil collecting groove 1011 is relatively low, the oil droplets in the oil collecting part 1010 will gather in the oil collecting groove 1011 under the action of gravity, thereby avoiding the spreading and retention of the oil droplets on the surface of the oil collecting part 1010, and then the oil droplets can be discharged in time.

[0067] Optionally, in order to increase the coverage range of the oil collecting groove 1011, the oil collecting groove 1011 can be set as a plurality of spaced-apart oil collecting pits, or the oil collecting groove 1011 can be set as an oil collecting ditch. Among them, in order to improve the timeliness of oil discharge, oil discharge through holes 1012 are correspondingly arranged in each of the plurality of oil collecting pits, or a plurality of oil discharge through holes 1012 are arranged in the oil collecting groove 1011.

[0068] In this embodiment, the oil collecting part 1010 is provided with a first drainage part 1013 located between the enclosing plate member 11 and the oil collecting groove 1011. That is to say, along the inner and outer direction of the valve ring part 100, the first drainage part 1013 is located between the oil collecting groove 1011 and the valve ring part 100. The first drainage part 1013 gradually inclines downward from the enclosing plate member 11 towards the oil collecting groove 1011, so as to guide the flow of oil droplets along the inner and outer direction of the valve ring part 100 through the first drainage part 1013, enabling the oil droplets that ooze out to the side of the valve ring part 100 where the oil collecting groove 1011 is provided to converge into the oil collecting groove 1011 more quickly under the action of gravity along the first drainage part 1013.

[0069] Optionally, the first drainage part 1013 is a first drainage inclined plane that gradually inclines downward from the enclosing plate member 11 towards the oil collecting groove 1011.

[0070] In this embodiment, the oil collecting part 1010 is provided with a second drainage part 1014. The second drainage part 1014 extends along the circumferential direction of the valve ring part 100. One end of the second drainage part 1014 along the circumferential direction of the valve ring part 100 is adjacent to the oil collecting groove 1011, and the second drainage part 1014 gradually inclines downward towards the oil collecting groove 1011 along the circumferential direction of the valve ring part 100. Thus, the second drainage part 1014 guides the flow of oil droplets along the circumferential direction of the valve ring part 100, enabling the oil droplets that extend to the side of the valve ring part 100 where the oil collecting groove 1011 is not provided to converge into the oil collecting groove 1011 more quickly under the action of gravity along the second drainage part 1014.

[0071] Optionally, the second drainage part 1014 is a second drainage inclined plane that gradually inclines downward towards the oil collecting groove 1011 along the circumferential direction of the valve ring part 100.

[0072] In this embodiment, oil collecting grooves 1011 are respectively provided on two opposite side parts of the enclosing plate member 11. Specifically, oil collecting grooves 1011 are respectively provided on two side parts of the enclosing plate member 11 in the front-back direction b. The oil collecting grooves 1011 are oil collecting ditches. The length direction of the oil collecting grooves 1011 is consistent with the left-right direction a of the enclosing plate member 11, and both ends of the length direction of the oil collecting grooves 1011 extend to the annular oil retaining member 1015.

[0073] On both sides of the front-rear direction b of the enclosing plate member 11, a first drainage portion 1013 is provided. The first drainage portion 1013 inclines downward from the enclosing plate member 11 towards the oil collecting groove 1011. On both sides of the left-right direction a of the enclosing plate member 11, two second drainage portions 1014 are provided. The two second drainage portions 1014 incline downward from the middle of the front-rear direction b of the enclosing plate member 11 towards the oil collecting grooves 1011 on both sides, so that the entire oil collecting portion 1010 is covered by the first drainage portion 1013, the second drainage portion 1014 and the oil collecting groove 1011, ensuring that the leaked oil can flow into the oil collecting groove 1011 in time, and further ensuring that the oil can be discharged through the oil discharge through hole 1012 and then be subjected to directional centralized treatment.

[0074] In an alternative embodiment of the present embodiment, the valve seat portion 101 is provided with an installation ring groove surrounding the valve ring portion 100. The bottom end of the enclosing plate member 11 is inserted into the installation ring groove. Compared with the fixing method of abutting the bottom end of the enclosing plate member 11 against the valve seat portion 101, this structure for fixing the bottom end of the enclosing plate member 11 through the installation ring groove can not only improve the fixing strength of the enclosing plate member 11, but also reduce the gap between the enclosing plate member 11 and the valve seat portion 101, thereby reducing the risk of oil leakage occurring through the gap between the enclosing plate member 11 and the valve seat portion 101.

[0075] In the present embodiment, the check valve structure further includes a first sealing member 13. The first sealing member 13 is sealingly connected between the bottom end of the enclosing plate member 11 and the installation ring groove. Specifically, the first sealing member can be a first sealing ring with a U-shaped radial cross-section. The outer ring of the first sealing ring is press-fitted into the installation ring groove, and the bottom end of the enclosing plate member 11 is press-fitted into the U-shaped space of the first sealing ring.

[0076] By providing the first sealing member 13, the gap between the bottom end of the enclosing plate member 11 and the installation ring groove is filled and sealed, further reducing the risk of oil leakage occurring through the bottom end of the enclosing plate member 11, and at the same time further reducing the risk of pressure leakage of the valve ring portion 100.

[0077] In the present embodiment, the check valve structure further includes a second sealing member 14. The second sealing member 14 is sealingly connected between the top of the enclosing plate member 11 and the bottom end of the outward expansion portion 1000. By providing the second sealing member 14, the gap between the top end of the enclosing plate member 11 and the bottom end of the outward expansion portion 1000 is filled and sealed, further reducing the risk of oil leakage occurring through the top end of the enclosing plate member 11, and at the same time further reducing the risk of pressure leakage of the valve ring portion 100.

[0078] Optionally, a flanging portion that bends toward the valve ring portion 100 is formed at the top of the shroud member 11. The flanging portion abuts against the bottom end of the outward expansion portion 1000, and the sound absorption layer 12 is limited in the height direction between the flanging portion and the valve seat portion 101. Further, the second sealing member 14 is an L-shaped sealing ring. One side of the L shape is sealed between the top surface of the flanging portion and the bottom surface of the outward expansion portion 1000, and the other side of the L shape is sealed between the bottom edge of the shroud member 11 corresponding to the outward expansion portion 1000 and the free end of the flanging portion.

[0079] In this embodiment, the shroud member 11 includes a plurality of sub-shrouds 110 that are sequentially connected in a surrounding manner. Along the circumferential direction of the valve ring portion 100, lugs 111 are provided at both ends of each sub-shroud 110. Every two adjacent sub-shrouds 110 are detachably connected through the lugs 111. Specifically, the lugs 111 of two adjacent sub-shrouds 110 are butted against each other, and fasteners pass through the butted lugs 111 of the two sub-shrouds 110 to positionally connect the ends of the two sub-shrouds 110, thereby realizing the circumferential limit connection of the shroud member 11.

[0080] Among them, since the two lugs 111 are detachably connected, it is convenient to disassemble and assemble the shroud member 11, so as to facilitate the regular replacement and maintenance of the sound absorption layer 12.

[0081] Optionally, in order to simplify the structure, the number of sub-shrouds 110 is two. The two ends of the two sub-shrouds 110 are butted against each other through the lugs 111 and are detachably connected through fasteners.

[0082] Embodiment Two

[0083] See Figures 1 to 9 As shown, Embodiment Two provides an oil fume extractor air box, which includes an air box body and the check valve structure in Embodiment One. The technical features of the check valve structure disclosed in Embodiment One are also applicable to this embodiment, and the technical features of the check valve structure already disclosed in Embodiment One will not be described repeatedly.

[0084] The air box body includes a top plate 20. The top plate 20 is provided with an air outlet through hole. The valve seat portion 101 of the check valve structure is arranged on the top plate 20. The air outlet through hole corresponds to the inside of the valve ring portion 100 of the check valve structure, so that the flue gas in the air box body flows into the air flow channel of the check valve structure through the air outlet through hole.

[0085] Specifically, the air box body further includes a machine box 21 with an opening formed at the top end. The top plate 20 covers the opening at the top end of the machine box 21.

[0086] The top plate 20 is provided with an oil leakage hole 201. The oil discharge through hole 1012 communicates with the inside of the air box body through the oil leakage hole 201. Thus, the oil flowing down through the oil discharge through hole 1012 directly falls into the oil leakage hole 201 and will not drip onto the top plate 20, that is, it will not contaminate the top plate 20. At the same time, the oil flows into the chassis 21 through the oil leakage hole 201. Generally, an oil discharge flow channel is provided in the chassis 21, and the oil leaked from the check valve structure can be processed together through the oil discharge flow channel.

[0087] Optionally, the air box body can be in the shape of a volute or a cube, etc.

[0088] In an alternative solution of this embodiment, the top plate 20 is formed with an oil collecting groove 200. The oil collecting groove 200 protrudes in a direction away from the top plate 20 and corresponds to the oil discharge through hole 1012. The oil leakage hole 201 is opened at the bottom of the oil collecting groove 200.

[0089] Optionally, the opening cross-sectional area of the oil collecting groove is larger than the cross-sectional area of the oil discharge through hole 1012, and the cross-sectional area of the oil leakage hole 201 is larger than the cross-sectional area of the oil discharge through hole 1012. Thus, it is ensured that the oil can accurately drip from the oil discharge through hole 1012 into the oil collecting groove 200 and the oil leakage hole 201, avoiding secondary oil leakage at the connection between the oil discharge through hole 1012 and the oil collecting groove 200.

[0090] In this embodiment, a third sealing member 22 is clamped between the top surface of the top plate 20 and the bottom surface of the valve seat portion 101. The third sealing member 22 is at least arranged around the oil collecting groove 200. Thus, the docking surface between the top plate 20 and the valve base can be sealed by the third sealing member 22, especially the opening contour of the oil collecting groove 200, to prevent oil from leaking to the docking surface between the top plate 20 and the valve base during the process of the oil dripping from the oil discharge through hole 1012 into the oil collecting groove 200.

[0091] Optionally, the valve seat portion 101 is tightly connected to the top plate 20 and the third sealing member 22 through a plurality of connection holes 1016.

[0092] Optionally, the third sealing member 22 is in the shape of a plate, and the third sealing member 22 is provided with a through hole matching the opening of the oil collecting groove 200.

[0093] The range hood air box in this embodiment has the advantages of the check valve structure in Embodiment 1. The advantages of the check valve structure disclosed in Embodiment 1 will not be repeated here.

[0094] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the various embodiments of the present invention. In addition, those skilled in the art can understand that although some of the embodiments described herein include certain features included in other embodiments rather than other features, the combination of the features of different embodiments means that it is within the scope of the present invention and forms different embodiments. For example, any one of the claimed embodiments can be used in any combination. The information disclosed in this background art section is only intended to deepen the understanding of the overall background art of the present invention, and should not be regarded as an admission or any form of suggestion that this information constitutes the prior art already known to those skilled in the art.

Claims

1. A check valve structure, characterized in that, It includes a check valve body, and the check valve body includes a valve ring part and a valve seat part; An air flow channel is formed inside the valve ring part. The bottom of the valve ring part is connected to the valve seat part. The air flow channel extends from the top end to the bottom end of the valve ring part and penetrates through the valve seat part; A plurality of sound-absorbing through holes arranged in an array are formed on the side wall surface of the valve ring part. The valve seat part is provided with an annular oil-blocking member that surrounds the valve ring part and forms a gap with the valve ring part, so that an oil-collecting part is formed between the valve seat part and the valve ring part within the annular oil-blocking member, and an oil-draining through hole is formed in the oil-collecting part.

2. The check valve structure according to claim 1, wherein It further includes a surrounding plate member and a sound-absorbing layer; The bottom end of the surrounding plate member is arranged in the oil-collecting part. An outward-expanding part is provided on the outer wall of the top of the valve ring part. The top end of the surrounding plate member abuts against the bottom end of the outward-expanding part. The sound-absorbing layer is filled between the outer side wall of the valve ring part and the surrounding plate member.

3. The check valve structure according to claim 2, characterized in that, The valve seat part is provided with an installation ring groove that surrounds the valve ring part, and the bottom end of the surrounding plate member is inserted into the installation ring groove.

4. The check valve structure according to claim 3, wherein It further includes a first sealing member, and the first sealing member is sealingly connected between the bottom end of the surrounding plate member and the installation ring groove; The check valve structure further includes a second sealing member, and the second sealing member is sealingly connected between the top of the surrounding plate member and the bottom end of the outward-expanding part.

5. The check valve structure according to claim 2, wherein, The surrounding plate member includes a plurality of sub-surrounding plates that are sequentially connected; Along the circumferential direction of the valve ring part, ears are provided at both ends of each sub-surrounding plate, and every two adjacent sub-surrounding plates are detachably connected through the ears.

6. The check valve structure according to claim 2, wherein, The oil-collecting part is provided with a sunken oil-collecting groove, and the oil-draining through hole is formed in the oil-collecting groove.

7. The check valve structure according to claim 6, characterized in that, Oil-collecting grooves are respectively provided on two opposite side parts of the surrounding plate member.

8. The check valve structure according to claim 6, wherein, The oil-collecting part is provided with a first drainage part located between the surrounding plate member and the oil-collecting groove, and the first drainage part slopes downward gradually from the valve ring part to the oil-collecting groove; The oil-collecting part is provided with a second drainage part. One end of the second drainage part along the circumferential direction of the valve ring part is adjacent to the oil-collecting groove, and the second drainage part slopes downward gradually along the circumferential direction of the valve ring part to the oil-collecting groove.

9. An oil fume suction hood air box, characterized in that, It includes a bellows body and the check valve structure according to any one of claims 1 to 8; The bellows body includes a top plate, and an air outlet through hole is formed in the top plate; The valve seat part of the check valve structure is arranged on the top plate, and the air outlet through hole corresponds to the inside of the valve ring part of the check valve structure; The top plate is provided with an oil leakage hole, and the oil-draining through hole communicates with the inside of the bellows body through the oil leakage hole.

10. The air duct of the range hood according to claim 9, characterized in that, The top plate forms an oil-collecting groove, and the oil-collecting groove protrudes in a direction away from the top plate and corresponds to the oil-draining through hole. The oil leakage hole is formed at the bottom of the oil-collecting groove; A third sealing member is clamped between the top surface of the top plate and the bottom surface of the valve seat part, and the third sealing member is at least arranged around the oil-collecting groove.

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