Check valve and range hood

Abstract

The invention relates to the technical field of kitchen utensils, in particular to a check valve and a range hood, and aims at solving the problems that an existing check valve is large in number of structural components, tedious in assembly process, high in cost and capable of affecting production and assembly efficiency. In order to achieve the purpose, the check valve comprises a valve body, two valve plates and a valve plate support, the valve plate support is detachably and fixedly connected to the inner wall of an exhaust channel of the valve body, the two valve plates are located in the exhaust channel and connected with the valve plate support in a clamped mode, a first limiting structure is arranged at the end, connected with the valve plate support in a clamped mode, of each valve plate, and a second limiting structure is arranged on the valve plate support. The valve plates and the valve plate support are connected in a clamped mode, connection of the valve plates and the valve plate support is achieved, the valve plates can rotate relative to the valve plate support, and the function that the exhaust channel is opened and closed through opposite rotation of the two valve plates is achieved; the number of parts of the whole check valve is reduced, the structure is simple, machining is easy, cost is low, assembling is convenient and fast, and the whole assembling efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of kitchen appliances, and in particular provides a check valve and a range hood. Background Art

[0002] Range hoods are becoming more and more common in daily life. Range hoods (smoke exhaust / Rangehood) are electrical appliances used in family kitchens to remove the fumes produced during cooking. In the kitchen environment, in order to prevent the backflow of fumes from the public flue, a check valve device is added to the air outlet of the range hood to prevent the backflow of fumes.

[0003] The structure of the existing check valve generally includes a check valve body, a check valve support, a valve plate, a limit foam, a shaft, a shaft bracket, a spring and other components. There are many components and the assembly process is complicated, which affects the production and assembly efficiency and has a high cost.

[0004] Therefore, the present invention needs to provide a new check valve and range hood to solve the above technical problems. Summary of the invention

[0005] The present invention aims to solve the above-mentioned technical problem, that is, to solve the problem that the structure of the existing check valve generally includes a check valve body, a check valve support, a valve plate, a limiting foam, a rotating shaft, a rotating shaft bracket, a spring and other components, has many components, and the assembly process is cumbersome, which affects the production and assembly efficiency and is costly.

[0006] To this end, in a first aspect, the present invention provides a check valve, comprising a valve body, two valve plates and a valve plate bracket, wherein the valve plate bracket is detachably and fixedly connected to an exhaust passage of the valve body, the two valve plates are located in the exhaust passage and are clamped with the valve plate bracket, a first limiting structure is provided at one end of the valve plate that is clamped with the valve plate bracket, a second limiting structure is provided on the valve plate bracket, the valve plate is rotatable relative to the valve plate bracket, and has a first position for closing the exhaust passage and a second position for opening the exhaust passage, and when the valve plate is in the second position, the first limiting structure contacts the second limiting structure to limit the maximum opening and closing angle of the valve plate.

[0007] When the above technical solution is adopted, the valve plate and the valve plate bracket are clamped, which not only realizes the connection between the two, but also enables the valve plate to rotate relative to the valve plate bracket, thereby realizing the function of opening and closing the exhaust channel by rotating the two valve plates in opposite directions, and the first limiting structure and the second limiting structure can contact each other, thereby limiting the maximum opening and closing angle of the valve plate through contact; the overall structure is simple, which avoids the problem of using shaft brackets, springs and other components in the existing check valve to realize valve plate rotation and reset. The check valve designed by the present invention has a small number of overall parts, a simple structure, easy processing, low cost, and convenient assembly, thereby improving the overall assembly efficiency.

[0008] In a specific embodiment of the check valve, a first opening groove engaged with the valve plate is formed on the valve plate support, and the valve plate support around the first opening groove forms a second limiting structure.

[0009] In a specific embodiment of the above-mentioned check valve, the valve plate is a semicircular structure, a downwardly bent limit plate is fixed to the diameter end of the valve plate, a second opening groove is provided at the end where the limit plate is connected to the valve plate, the second opening groove is engaged with the adjacent first opening groove to clamp the valve plate bracket between the valve plate and the limit plate, the limit plate around the second opening groove forms a first limiting structure, and when the limit plate contacts the valve plate bracket, the valve plate is located in the second position; and / or

[0010] When the valve plate is in the first position, the valve plate is in contact with the valve plate support.

[0011] When the above technical solution is adopted, the second opening groove and the first opening groove are engaged with each other, which not only limits the displacement of the valve plate, so that the valve plate can only make rotational movement in the exhaust channel, thereby opening or closing the exhaust channel, but also the limit plate limits the maximum opening and closing angle of the valve plate during the rotation of the valve plate, that is, the maximum opening and closing angle of the valve plate is when the limit plate contacts the valve plate bracket; the maximum opening of the valve plate can be adjusted by changing the bending angle of the limit plate, which replaces the limiting foam in the existing check valve structure, and the limiting is more reliable.

[0012] In the specific implementation of the above-mentioned check valve, the height of the limit plate is smaller than the radius of the valve plate; and / or

[0013] The length of the limiting plate is smaller than the diameter of the valve plate.

[0014] When the above technical solution is adopted, since the rotation of the valve plate relative to the valve plate bracket is similar to a lever mechanism, the valve plate is the power arm, the limit plate is the resistance arm, and the radius of the valve plate is greater than the height of the limit plate, it means that the power arm is greater than the resistance arm, making it easier for the valve plate to rotate, so that it can be easily opened or closed during use, with a fast response speed, and no longer requires the spring in the existing check valve for compensation; the length of the limit plate is smaller than the diameter of the valve plate, which can prevent the end of the limit plate from contacting the inner wall of the exhaust channel, reduce friction and resistance when the valve plate is closed, and make it easier for the valve plate to rotate.

[0015] In the specific implementation of the check valve, when the two valve plates are in the first position, the limiting plates respectively fixed to the two valve plates are in contact with each other; and / or

[0016] The number of the valve plate brackets is two and they are arranged opposite to each other.

[0017] When the above technical solution is adopted, when the valve plate is closed, the two limit plates fit together to reduce the existence of gaps and thus reduce the backflow of oil smoke; there are two valve plate brackets and they are relatively arranged in the exhaust channel, so that the two ends of the two valve plates are respectively clamped on the corresponding valve plate brackets, thereby ensuring the balance of the two valve plates and making the two valve plates relatively stable during rotation.

[0018] In a specific embodiment of the check valve, the valve plate and the valve plate bracket are detachably fixedly connected via a first connecting member.

[0019] When the above technical solution is adopted, during the transportation of the check valve, the valve plate and the valve plate bracket are fixed by the first connecting member, which can prevent the valve plate from rotating, vibrating, etc. during transportation to generate vibration noise or deformation, thereby reducing the product transportation scrap rate; at the same time, the first connecting member can be removed when the check valve is in use without affecting the opening and closing of the valve plate, and if it is necessary to reduce the exhaust volume of the range hood, one of the valve plates can be fixed by the first connecting member, so that only one valve plate is opened and closed. In this way, the check valve has only half of the working exhaust volume, which can not only meet the functions of its own components, but also enable the range hood to be used normally when the air supply is insufficient, thereby avoiding the occurrence of danger.

[0020] In a specific embodiment of the check valve, a first connecting hole is provided on the valve plate, and a second connecting hole is provided on the valve plate bracket. When the valve plate is in the first position, the first connecting hole is aligned with the second connecting hole and connected through a first connecting member.

[0021] In a specific embodiment of the check valve, the number of the first connecting holes and the number of the second connecting holes are both two, the two first connecting holes are respectively located at the two ends of the diameter end of the valve plate, and the two second connecting holes are respectively located on both sides of the first opening groove.

[0022] When the above technical solution is adopted, the second connecting holes are located on both sides of the first opening groove without affecting the clamping connection between the valve plate and the valve plate bracket.

[0023] In a specific embodiment of the above-mentioned check valve, the valve plate bracket includes a first support plate and a second support plate, one end of the first support plate is fixedly connected to the top end of the second support plate to form an L-shaped structure, the first opening groove is arranged on the first support plate, the second support plate is detachably fixedly connected to the inner wall of the exhaust channel, and the first support plate around the first opening groove forms the second limiting structure.

[0024] In a second aspect, the present invention further provides a range hood, on which a check valve as described in any one of the above technical solutions is installed. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings, in which:

[0026] Figure 1 It is a schematic diagram of the overall structure of the check valve provided by the present invention;

[0027] Figure 2 It is a structural schematic diagram of the connection between the valve plate, the valve plate bracket and the valve body;

[0028] Figure 3 It is a structural schematic diagram of the connection between the valve plate bracket and the exhaust channel;

[0029] Figure 4 It is a schematic diagram of the structure of the valve body;

[0030] Figure 5 It is a schematic diagram of the structure of the valve plate;

[0031] Figure 6 It is a structural schematic diagram of the valve plate and the valve plate bracket being clamped together;

[0032] Figure 7 It is a structural schematic diagram of the valve plate bracket;

[0033] Figure 8 It is a schematic diagram of the valve plate in a closed state;

[0034] Fig. 9 It is a schematic diagram of the valve plate in the open state;

[0035] Fig.10 is a structural schematic diagram of a valve plate and a valve plate bracket being fixed by a first connecting member;

[0036] Fig.11 This is a schematic diagram of a structure in which only one of the valve plates can be opened and closed.

[0037] List of reference numerals:

[0038] 1. Valve body; 11. Exhaust channel; 12. Base; 2. Valve plate bracket; 3. Valve plate; 4. Second opening slot; 5. First opening slot; 6. Second through hole; 7. Third through hole; 8. Second connecting piece; 9. Limiting plate; 10. First connecting piece; 13. Second connecting hole; 14. First connecting hole. DETAILED DESCRIPTION

[0039] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not used to limit the scope of protection of the present invention. Those skilled in the art can make adjustments to them as needed to adapt to specific application scenarios.

[0040] It should be noted that in the description of the present invention, the terms "upper", "lower", "inner", "outer", etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the relevant devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, ordinal numbers "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0041] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installation" and "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 a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] The structure of the existing check valve generally includes a check valve body, a check valve support, a valve plate, a limit foam, a shaft, a shaft bracket, a spring and other components. There are many components and the assembly process is complicated, which affects the production and assembly efficiency and has a high cost.

[0043] In order to solve the above technical problems, the present invention provides a check valve. Figure 1 , Figure 2 and Figure 3 , Figure 1 It is a schematic diagram of the overall structure of the check valve provided by the present invention; Figure 2 It is a structural schematic diagram of the connection between the valve plate, the valve plate bracket and the valve body; Figure 3 It is a structural schematic diagram of the connection between the valve plate bracket and the exhaust passage. The check valve includes a valve body 1, two valve plates 3 and a valve plate bracket 2. The valve plate bracket 2 is detachably fixedly connected to the exhaust passage 11 of the valve body 1. The two valve plates 3 are located in the exhaust passage 11 and are clamped with the valve plate bracket 2. One end of the valve plate 3 clamped with the valve plate bracket 2 is provided with a first limiting structure, and the valve plate bracket 2 is provided with a second limiting structure. The valve plate 3 can rotate relative to the valve plate bracket 2 and has a first position of closing the exhaust passage 11 and a second position of opening the exhaust passage 11. When the valve plate 3 is in the second position, the first limiting structure contacts the second limiting structure to limit the maximum opening and closing angle of the valve plate 3. Being in the first position refers to the state in which the two valve plates 3 close the exhaust passage 11, the valve plate 3 contacts and fits with the valve plate bracket 2, and the valve plate 3 is in a horizontal state.

[0044] Specifically, the valve body 1 includes a base 12 and an exhaust passage 11, the exhaust passage 11 is fixedly connected to the base 12, the exhaust passage 11 is used to connect to the smoke pipe, and the cross section of the exhaust passage is circular, which is convenient for connecting to the smoke pipe. The valve body 1, the valve plate 3 and the valve plate bracket 2 are all made of sheet metal, which has good tolerance to high temperature environment, is not easy to be damaged and has a long service life.

[0045] In one embodiment, see Figure 1 , Figure 4 and Figure 7 The valve plate bracket 2 is provided with a second through hole 6, and the inner wall of the exhaust passage 11 is provided with a third through hole 7 at a position connected to the valve plate bracket 2. The number of the third through holes 7 is the same as that of the second through holes 6 and they correspond one to one. The third through holes 7 and the second through holes 6 are connected by a second connecting member 8 to fix the valve plate bracket 2 and the exhaust passage 11. The second connecting member 8 can be a screw or a rivet.

[0046] It should be noted that the present invention does not specifically limit the number of the second through holes 6 and the third through holes 7. In order to ensure the firmness of the connection between the valve plate bracket 2 and the exhaust channel 11, a plurality of the second through holes and the third through holes 7 may be provided, such as two or three.

[0047] In addition, regarding the connection method between the valve plate bracket 2 and the exhaust passage 11, although in the above description, a second through hole 6 is opened on the valve plate bracket 2, a third through hole 7 is opened on the inner wall of the exhaust passage 11, and then the second connecting member 8 passes through the second through hole 6 and the third through hole 7 to realize the detachable fixed connection between the valve plate bracket 2 and the exhaust passage 11, this is not restrictive, and other structural methods can also be used for fixing. For example, at least two studs are fixed to the bottom end of the valve plate bracket 2, and a positioning block is fixed on the inner wall of the exhaust passage 11. The positioning block is provided with a connecting hole, and the stud passes through the connecting hole and the nut is tightened to realize the detachable fixed connection between the valve plate bracket 2 and the exhaust passage 11. Without deviating from the basic principle of the present invention, the design can be flexibly based on the actual use requirements.

[0048] In one embodiment, see Figure 7 The valve plate support 2 is provided with a first opening groove 5 which is engaged with the valve plate 3, and the valve plate support around the first opening groove forms a second limiting structure. The first opening groove 5 is a U-shaped structure.

[0049] It should be noted that the number of valve plate brackets 2 can be one or two. When the number of valve plate brackets 2 is one, the top end surface of the valve plate bracket 2 is longer to ensure that it can fully support the two valve plates 3. In order to ensure that the two valve plates are more stable during the rotation process, preferably, the number of valve plate brackets 2 is two and they are arranged opposite to each other.

[0050] In one embodiment, the valve plate bracket 2 is an L-shaped structure, the first opening slot 5 is provided at the top end of the valve plate bracket 2 , and the side end of the valve plate bracket 2 is detachably fixedly connected to the inner wall of the exhaust passage 11 .

[0051] Specifically, the valve plate bracket 2 includes a first support plate and a second support plate, one end of the first support plate is fixedly connected to the top end of the second support plate to form an L-shaped structure, the second support plate is detachably fixedly connected to the inner wall of the exhaust channel 11, the first opening groove 5 is opened on the first support plate and is located at the other end of the first support plate, the first support plate around the first opening groove forms the second limiting structure, and the second through hole 6 is opened on the second support plate.

[0052] The first support plate and the second support plate can be integrally formed or spliced ​​and fixed by welding or other processes. The second through hole can be integrally formed when the valve plate bracket is formed, or the second through hole can be processed separately later. The present application does not specifically limit the processing method of the second through hole, and it can be flexibly designed according to actual use requirements.

[0053] It should be noted that although the valve plate bracket 2 described above is L-shaped, this is not restrictive. The valve plate bracket 2 can also be designed to be other shapes. For example, the valve plate bracket 2 is a U-shaped structure. Without deviating from the basic principles of the present invention, the shape of the valve plate bracket 2 can be flexibly designed according to the use requirements.

[0054] When the valve plate bracket 2 is a U-shaped structure, the U-shaped opening of the valve plate bracket 2 faces the radial direction of the exhaust channel 11. At this time, the two side walls of the valve plate bracket 2 are arranged up and down, and the first opening groove 5 is set on the upper side wall, and the lower side wall is used to connect with the exhaust channel 11. For example, a connecting plate is fixed on the inner wall of the exhaust channel 11, and a third through hole 7 is opened on the connecting plate. A second through hole 6 is opened on the lower side wall of the valve plate bracket 2, and the second through hole 6 and the third through hole 7 are connected by a second connecting member 8, thereby realizing the detachable fixed connection function of the U-shaped valve plate bracket 2 and the exhaust channel 11.

[0055] In the above embodiment, the valve plate bracket 2 and the exhaust channel 11 are designed to be detachably fixedly connected, which not only facilitates the replacement of the valve plate bracket 2, but also ensures that the end of the valve plate 3 can be smoothly inserted into the first opening groove 5. After the end of the valve plate 3 is inserted into the first opening groove 5, the valve plate bracket 2 is fixed in the exhaust channel 11, ensuring the cooperation between the valve plate 3 and the valve plate bracket 2.

[0056] In one embodiment, see Figure 5 and Figure 6The valve disc 3 is a semicircular structure. A downwardly bent limiting plate 32 is fixed at the diameter end of the valve disc 3. A second opening slot 4 is provided at the end of the limiting plate 32 connected to the valve disc 3. The second opening slot 4 is engaged with the adjacent first opening slot 5 to clamp the valve disc support 2 between the valve disc 3 and the limiting plate 32. The limiting plate 32 around the second opening slot 4 forms a first limiting structure. When the limiting plate 32 contacts the valve disc support 2, the valve disc 3 is located at the second position. After the second opening slot 4 is engaged with the first opening slot 5, the valve disc 3 and the valve disc support 2 form a lever-like mechanism, with the contact point between the second opening slot 4 and the first opening slot 5 as the fulcrum, thereby replacing the rotating shaft function in the existing check valve structure and reducing the number of parts used. When the valve plate 3 is closed, the valve plate 3 fits against the first support plate of the valve plate bracket 2 under the action of its own weight, and the valve plate bracket 2 supports the valve plate 3 as a whole. The two valve plates 3 are combined to close the exhaust channel 11. In order to support the valve plate 3, the first support plate of the valve plate bracket 2 needs to have a certain length to prevent the valve plate 3 from falling and causing smoke leakage.

[0057] Specifically, when there are two valve plate brackets 2, the two ends of the valve plate 3 are respectively connected to the adjacent valve plate brackets 2. At this time, the ends of the limit plate 32 connected to the valve plate 3 are respectively provided with second opening grooves 4, such as Figure 5 As shown; when the number of valve plate brackets 2 is one, a second opening slot 4 is provided at the portion where one end of the limit plate 32 is connected to the diameter end of the valve plate 3. The second opening slot 4 is a U-shaped structure. In order to reduce the weight of the limit plate, a weight reduction hole can be provided on the limit plate.

[0058] In addition, after the second opening groove 4 is engaged with the first opening groove 5, the limit plate 32 extends to the bottom of the first opening groove 5. The angle between the limit plate 32 and the valve plate 3 determines the opening and closing angle of the valve plate 3. When the limit plate 32 rotates with the valve plate 3 and contacts the bottom end of the valve plate bracket 2, the valve plate 3 cannot continue to rotate. This is the maximum opening angle of the valve plate 3. Since the angles between the limit plate 32 and the valve plate 3 are different, the opening angles of the valve plate 3 are also different. Therefore, it is only necessary to replace the valve plate 3 with different angles to change the maximum opening of the check valve, thereby realizing the adjustment function of the check valve with different openings.

[0059] In addition, the limiting plate 32 and the valve plate 3 can be made by an integrated molding process, or by splicing. The second opening groove 4 can be integrally molded with the limiting plate 32 and the valve plate 3, or can be processed on the valve plate 3 later, and can be flexibly designed according to actual use requirements. In the present application, the limiting plate 32 and the valve plate 3 are integrally molded, and the second opening groove 4 is also integrally molded as a preferred embodiment, which reduces subsequent processing and is conducive to improving production efficiency.

[0060] In the above embodiment, the second opening groove 4 and the first opening groove 5 are engaged with each other, and the valve plate bracket 2 is clamped between the valve plate 3 and the limiting plate 32 to achieve the clamping connection. There is an overlapping part between the valve plate bracket 2 and the valve plate 3, which not only limits the displacement of the valve plate 3, so that the valve plate 3 can only rotate in the exhaust passage 11, thereby opening or closing the exhaust passage 11, but also the limiting plate 32 also limits the maximum opening of the valve plate 3 during the rotation of the valve plate 3, that is, when the limiting plate 32 contacts with the valve plate bracket 2, the maximum opening and closing angle of the valve plate 3 (such as Fig. 9 By changing the bending angle of the limiting plate 32, the opening and closing angle of the valve plate 3 can be adjusted, replacing the limiting foam in the existing check valve structure, and the limiting is more reliable.

[0061] In one embodiment, when the valve plate is in the first position (eg Figure 8 As shown in FIG. 1 , the valve plate 3 is in contact with the valve plate support 2 and the valve plate 3 is in a horizontal state. This ensures that the exhaust passage 11 can be completely closed when the two valve plates 3 are aligned. That is, the diameter edges of the two valve plates are aligned.

[0062] In one embodiment, the height of the limiting plate 32 is smaller than the radius of the valve plate 3. Preferably, the radius of the valve plate 3 is greater than or equal to 15 times the height of the limiting plate 32.

[0063] In the above embodiment, since the rotation of the valve plate 3 relative to the valve plate bracket 2 is similar to a lever mechanism, the valve plate 3 is the power arm, the limit plate 32 is the resistance arm, and the radius of the valve plate 3 is greater than the height of the limit plate 32, it means that the power arm is greater than the resistance arm, making it easier for the valve plate 3 to rotate, so that it can be easily opened or closed during use, with a fast response speed, and no longer requires the spring in the existing check valve for compensation.

[0064] In one embodiment, the length of the limiting plate 32 is smaller than the diameter of the valve plate 3 .

[0065] In the above embodiment, the length of the limit plate 32 is smaller than the diameter of the valve plate 3, which can prevent the end of the limit plate 32 from contacting the inner wall of the exhaust channel 11, reduce friction and resistance when the valve plate is closed, and make the valve plate 3 easier to rotate.

[0066] In the above embodiment, when the two valve plates 3 are in the closed state, the limiting plates 32 connected to the two valve plates 3 in the first opening slot 5 fit together. When the valve plates 3 are closed, the two limiting plates 32 fit together to reduce the existence of gaps to reduce oil fume backflow.

[0067] In one embodiment, the number of the second opening slots 4 is the same as the number of the first opening slots 5 .

[0068] In one embodiment, see Fig.10 The valve plate and the valve plate bracket are detachably fixedly connected via a first connecting member.

[0069] During transportation of the check valve, the valve plate 3 and the valve plate bracket 2 are fixed together by the first connecting member 10, which can prevent the valve plate from rotating, vibrating, etc., generating vibration noise or deformation during transportation, thereby reducing the product transportation scrap rate.

[0070] During operation, the range hood exhausts smoke to the outside, that is, the indoor air is exhausted to the outside. If the indoor air is not effectively replenished, a vacuum-like environment will appear, resulting in low indoor air content, which makes people prone to hypoxia. Due to the difference in usage environment, users cannot naturally replenish the indoor air in the usage environment. To solve this problem, in the present invention, the valve plate is detachably fixedly connected to the valve plate bracket through a first connecting member. The first connecting member can be removed when the check valve is in use without affecting the opening and closing of the valve plate. If it is necessary to reduce the exhaust volume of the range hood, one of the valve plates can be fixed by the first connecting member, so that only one valve plate is opened and closed. In this way, the check valve has only half of the working exhaust volume. This can not only meet the functions of its own components, but also enable the range hood to be used normally when the air supply is insufficient, thereby avoiding the occurrence of danger.

[0071] In one embodiment, see Fig.11 The valve disc is provided with a first connection hole 14, the valve disc support 2 is provided with a second connection hole 13, and when the valve disc 3 is in the first position, the first connection hole 14 is aligned with the second connection hole 13 and connected through the first connection member 10. The first connection member can be, but is not limited to, a screw, the first connection hole is a through hole, and the second connection hole is a tapped hole.

[0072] Specifically, when there are two valve plate brackets 2, there are two first connecting holes 14 on each valve plate 3, and there are two second connecting holes 13 on each valve plate bracket 2. The two first connecting holes 14 are respectively located at the two ends of the diameter end of the valve plate 3, and the two second connecting holes 13 on the valve plate bracket 2 are respectively located on both sides of the first opening groove 5, so as to avoid affecting the clamping connection between the valve plate and the valve plate bracket.

[0073] It should be noted that the number of the first connection holes and the second connection holes is not specifically limited in this application, and can be flexibly designed according to design requirements and usage needs without departing from the basic principles of the present invention. In this application, the number of valve plate brackets is two, the number of first connection holes on the valve plate is two and they are respectively located at the two ends of the valve plate diameter end, and the valve plate bracket is provided with two second connection holes as a preferred embodiment of this application, which has the advantages of smooth operation and high stability.

[0074] The assembly process of the check valve designed in the present invention is as follows: taking the number of two valve plate brackets 2 as an example for explanation, the second opening grooves 4 at both ends of the two valve plates 3 are respectively inserted into the first opening grooves 5 on a valve plate bracket 2, and the two valve plates 3 are supported by the two valve plate brackets 2, and then the second through holes 6 on the two valve plate brackets 2 are aligned with the corresponding third through holes 7, and then the second connecting member 8 is cooperated with the second through holes 6 and the third through holes 7 to realize the detachable fixed connection between the valve plate bracket 2 and the exhaust channel 11. When the second connecting member 8 is a rivet, the second connecting member 8 passes through the second through holes 6 and the third through holes 7 to rivet and fix the valve plate bracket 2 to the exhaust channel 11.

[0075] In addition, the present invention further provides a range hood, on which a check valve as described in any one of the above technical solutions is installed.

[0076] The working principle of the check valve designed in the present invention is that when the range hood is turned on, suction is generated to suck the air containing oil smoke from the outside into the smoke exhaust channel, and the two valve plates rotate upward under the push of the air flow. When the limit plate contacts the bottom end of the valve plate bracket, the maximum opening of the valve plate is reached. Since the valve plate is always in an open state under the impact of the air flow, the oil smoke air in the kitchen enters the smoke pipe through the open check valve and is discharged outdoors, thereby realizing the exhaust function of the oil smoke air in the kitchen. When the range hood is turned off, the air flow stops, and the weight of the valve plate is greater than the weight of the limit plate. Therefore, the valve plate returns to its original position under the action of its own gravity, that is, the valve plate is again fitted with the valve plate bracket and is in a closed state. At this time, if other oil smoke air in the smoke pipe flows back to the check valve, since the two valve plates are in a closed state, the two limit plates connected to the valve plates fit each other, and the valve plate bracket supports the valve plate, so that the valve plate will not rotate downward due to the impact force generated by the backflow of oil smoke air, thereby achieving the purpose of preventing the backflow of oil smoke air.

[0077] In the above-mentioned various embodiments and various expanded implementation methods, the valve plate 3 is snap-connected with the valve plate bracket 2, which not only realizes the connection between the two, but also enables the valve plate 3 to rotate relative to the valve plate bracket 2, thereby realizing the function of opening and closing the exhaust channel 11 by rotating the two valve plates 3 in opposite directions; at the same time, it avoids the use of components such as rotating shaft brackets and springs, reduces the number of parts of the check valve as a whole, has a simple structure, is easy to process, has low cost, and is easy to assemble, thereby improving the overall assembly efficiency; and the check valve has a simple structure, low requirements on the production environment, and does not require a precise matching relationship.

[0078] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A check valve, characterized in that: The check valve includes a valve body, two valve plates and a valve plate bracket, the valve plate bracket is detachably fixedly connected to the exhaust channel of the valve body, the two valve plates are located in the exhaust channel and are clamped with the valve plate bracket, one end of the valve plate that is clamped with the valve plate bracket is provided with a first limiting structure, and the valve plate bracket is provided with a second limiting structure. The valve plate can rotate relative to the valve plate bracket and has a first position that closes the exhaust channel and a second position that opens the exhaust channel. When the valve plate is in the second position, the first limiting structure contacts the second limiting structure to limit the maximum opening and closing angle of the valve plate.

2. The check valve according to claim 1, characterized in that: The valve plate bracket is provided with a first opening groove which is engaged with the valve plate, and the valve plate bracket around the first opening groove forms a second limiting structure.

3. The check valve according to claim 2, characterized in that: The valve disc is a semicircular structure, a downwardly bent limiting plate is fixed to the diameter end of the valve disc, a second opening groove is provided at the end of the limiting plate connected to the valve disc, the second opening groove is engaged with the adjacent first opening groove to clamp the valve disc bracket between the valve disc and the limiting plate, the limiting plate around the second opening groove forms a first limiting structure, and when the limiting plate contacts the valve disc bracket, the valve disc is located at the second position; and / or When the valve plate is in the first position, the valve plate is in contact with the valve plate support.

4. The check valve according to claim 3, characterized in that: The height of the limit plate is smaller than the radius of the valve plate; and / or The length of the limiting plate is smaller than the diameter of the valve plate.

5. The check valve according to claim 3, characterized in that: When the two valve sheets are both in the first position, the limiting plates respectively fixed to the two valve sheets are in contact with each other; and / or The number of the valve plate brackets is two and they are arranged opposite to each other.

6. The check valve according to any one of claims 1 to 5, characterized in that: The valve plate and the valve plate bracket are detachably fixedly connected via a first connecting member.

7. The check valve according to claim 6, characterized in that: The valve plate is provided with a first connecting hole, and the valve plate bracket is provided with a second connecting hole. When the valve plate is in a first position, the first connecting hole is aligned with the second connecting hole and connected through a first connecting member.

8. The check valve according to claim 7, characterized in that: The number of the first connection holes and the number of the second connection holes are both two, the two first connection holes are respectively located at the two ends of the diameter end of the valve plate, and the two second connection holes are respectively located at the two sides of the first opening groove.

9. The check valve according to claim 2, characterized in that: The valve plate bracket includes a first support plate and a second support plate, one end of the first support plate is fixedly connected to the top end of the second support plate to form an L-shaped structure, the first opening groove is arranged on the first support plate, the second support plate is detachably fixedly connected to the inner wall of the exhaust channel, and the first support plate around the first opening groove forms the second limiting structure.

10. A range hood, characterized in that: The range hood is installed with a check valve as described in any one of claims 1 to 9.

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