Check valve assembly

Abstract

The application discloses a check valve assembly, which comprises a seat body, a valve piece, a sealing piece and a connecting piece. The seat body is internally formed with a smoke exhaust passage which is communicated along the exhaust direction of a smoke exhaust machine. A sealing edge is arranged on the inner wall of the smoke exhaust passage. The valve piece is movably arranged on the seat body to selectively open or close the smoke exhaust passage. At least a part of the sealing piece covers the corresponding part of the valve piece and the sealing edge, so as to cooperate with the sealing edge to close the smoke exhaust passage when the valve piece closes the smoke exhaust passage. The connecting piece connects the valve piece and the sealing piece. The valve piece, the sealing piece and the connecting piece are sequentially arranged in the thickness direction, thereby improving the connection reliability between the sealing piece and the valve piece and improving the sealing effect of the check valve.

Description

Technical Field

[0001] This application relates to the field of range hoods, and in particular to a check valve assembly. Background Technology

[0002] In related technologies, the valve plate of a check valve has poor sealing effect at the edge when closing the flue, resulting in smoke leakage. This can easily cause oil fumes in the public flue to backflow into the kitchen. To improve the sealing effect of the check valve, a sealing element is installed at the edge of the check valve. The existing sealing element is glued to the valve plate by adhesive. During long-term use, the valve plate comes into contact with high-temperature oil fumes, and the adhesive between the valve plate and the sealing element is prone to failure, causing the sealing element to fall off the valve plate and deteriorating the sealing effect of the check valve. Therefore, how to improve the sealing effect of the check valve has become the technical problem to be solved in this application. Utility Model Content

[0003] This application aims to at least solve one of the technical problems existing in the prior art. To this end, one object of this application is to provide a check valve assembly that can improve the sealing effect of the check valve.

[0004] A check valve assembly according to an embodiment of this application includes: a seat, wherein a smoke exhaust channel is formed inside the seat and flows in the direction of exhaust from the range hood, and a sealing edge is provided on the inner wall of the smoke exhaust channel; a valve plate, which is movably disposed on the seat to selectively open or close the smoke exhaust channel; a sealing plate, at least a portion of which covers the portion of the valve plate corresponding to the sealing edge, so as to cooperate with the sealing edge to close the smoke exhaust channel when the valve plate closes the smoke exhaust channel; and a connector, which connects the valve plate and the sealing plate, wherein the valve plate, the sealing plate, and the connector are arranged sequentially in the thickness direction.

[0005] According to the check valve assembly of this application embodiment, when the valve plate closes the smoke exhaust channel, the sealing plate cooperates with the sealing edge, and the elastic deformation capability of the sealing plate allows it to fit tightly against the sealing edge; at the same time, the connecting member ensures the stability of the cooperation relationship between the sealing plate and the sealing edge. Through the synergistic effect of the sealing edge providing a stable mating surface, the sealing plate enhancing the sealing fit, and the connecting member ensuring structural stability, the sealing effect is significantly improved, effectively solving the smoke leakage problem and achieving the beneficial effect of improving the sealing performance of the check valve.

[0006] According to some embodiments of the present application, in a check valve assembly, at least a portion of the valve plate and the sealing plate are spaced apart to define a deformation cavity, and at least a portion of the deformation cavity is disposed corresponding to the sealing edge to be adapted for the sealing plate to deform toward the deformation cavity.

[0007] According to some embodiments of this application, the check valve assembly further includes: a connecting rod provided in the smoke exhaust channel, the connecting rod dividing the smoke exhaust channel into a first smoke exhaust hole and a second smoke exhaust hole, a sealing edge disposed around the edges of the first smoke exhaust hole and the second smoke exhaust hole, and a valve plate constructed as two valves that can selectively close the first smoke exhaust hole and the second smoke exhaust hole respectively.

[0008] According to some embodiments of the present application, in the check valve assembly, two valve plates are rotatably disposed on the seat, and the rotation axes of the two valve plates are parallel to the connecting rod and adjacent to the two side edges in the width direction of the connecting rod.

[0009] According to some embodiments of the present application, the check valve assembly further includes a reset member, which is disposed on the connecting rod and acts on the two valve plates. The reset member is used to drive the valve plates to rotate toward the direction of closing the smoke exhaust hole.

[0010] According to some embodiments of the present application, the check valve assembly has a recess on the outer periphery of the valve plate that is directly opposite to the sealing edge. The sealing plate covers the open side of the recess on the corresponding valve plate, and a deformation cavity is defined in the recess to accommodate the deformation of the sealing plate toward the deformation cavity.

[0011] According to some embodiments of the present application, each valve plate of the check valve assembly includes: a sector-shaped inner plate; a first annular plate, which is disposed around the outer periphery of the sector-shaped inner plate, and the first annular plate and the connector are directly opposite each other in the thickness direction; and a second annular plate, which is disposed around the outer periphery of the first annular plate, and the second annular plate forms a recess, and the connector at least avoids the portion of the recess that is aligned with the sealing edge; wherein the sector-shaped inner plate, the first annular plate and the second annular plate are arranged sequentially in the direction away from the smoke inlet side.

[0012] According to some embodiments of the check valve assembly of this application, a drip groove is formed on the side of the first annular plate facing the sealing sheet, and a partition rib is provided between the drip groove and the recess to separate the drip groove from the recess.

[0013] According to some embodiments of the check valve assembly of this application, a first annular plate is formed with a positioning post, and a threaded hole open toward the exhaust side is formed in the positioning post; a first mating hole and a second mating hole corresponding to the positioning post are respectively formed on the sealing plate and the connector; a fastener passes through the first mating hole and the second mating hole and is connected to the threaded hole of the positioning post.

[0014] According to some embodiments of the present application, in the check valve assembly, the outer peripheral edge of the valve plate is formed with a first retaining edge protruding toward the sealing edge, and the outer edge of the sealing plate is formed with a second retaining edge protruding toward the valve plate. The first retaining edge and the second retaining edge are at least partially overlapped in the radial direction; wherein the first retaining edge is disposed inside the second retaining edge, or the first retaining edge is disposed outside the second retaining edge. Attached Figure Description

[0015] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0016] Figure 1 This is a schematic diagram of the structure of a check valve assembly according to an embodiment of this application;

[0017] Figure 2 This is a top view of a check valve assembly according to an embodiment of this application;

[0018] Figure 3 This is a bottom view of a check valve assembly according to an embodiment of this application;

[0019] Figure 4 According to one embodiment of this application Figure 3 A cross-sectional view of position AA;

[0020] Figure 5 yes Figure 4 A magnified view of a portion of area A in the center circle;

[0021] Figure 6 According to another embodiment of this application Figure 3 A cross-sectional view of position AA;

[0022] Figure 7 yes Figure 6 A magnified view of part B in the center circle;

[0023] Figure 8 This is a schematic diagram of the component assembly of a check valve according to one embodiment of this application;

[0024] Figure 9 This is a schematic diagram of the component assembly of a check valve according to another embodiment of this application.

[0025] Figure label:

[0026] 1. Check valve assembly;

[0027] 11. Sealing body; 111. Smoke exhaust duct; 112. Sealing edge; 1121. Stopping part;

[0028] 12. Valve plate; 121. Recessed portion; 122. First rib;

[0029] 1201. Sector-shaped inner plate; 1211. Reinforcing rib; 1202. First annular plate; 1203. Second annular plate;

[0030] 13. Sealing sheet; 131. Second retaining edge;

[0031] 14. Connecting parts; 1401. Glue drip tray; 1402. Ribs;

[0032] 15. Fasteners;

[0033] 161. Connecting rod; 162. Torsion spring; 163. Torsion spring pin. Detailed Implementation

[0034] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0035] The following is for reference. Figures 1-9 Description of check valve assembly 1 according to an embodiment of this application.

[0036] According to an embodiment of this application, a check valve assembly 1 includes a seat 11, a valve plate 12, a sealing plate 13, and a connector 14. The seat 11 forms a smoke exhaust channel 111 that flows in the direction of exhaust from the range hood. A sealing edge 112 is provided on the inner wall of the smoke exhaust channel 111. The valve plate 12 is movably disposed on the seat 11 to selectively open or close the smoke exhaust channel 111. At least a portion of the sealing plate 13 covers the portion of the valve plate 12 corresponding to the sealing edge 112, so that when the valve plate 12 closes the smoke exhaust channel 111, it cooperates with the sealing edge 112 to close the smoke exhaust channel 111. The connector 14 connects the valve plate 12 and the sealing plate 13. The valve plate 12, the sealing plate 13, and the connector 14 are arranged sequentially in the thickness direction.

[0037] In related technologies, when the valve plate of a check valve closes the flue, the sealing effect at the edge is poor, resulting in smoke leakage. This can easily cause fumes from the public flue to flow back into the kitchen. To improve the sealing effect of the check valve, a sealing element is installed at the edge of the check valve. The existing sealing element is glued to the valve plate with adhesive. However, during long-term use, the valve plate comes into contact with high-temperature fumes, and the adhesive between the valve plate and the sealing element is prone to failure, causing the sealing element to fall off the valve plate and reducing the sealing effect of the check valve.

[0038] It is understood that a smoke exhaust channel 111 is formed inside the seat 11, and a sealing edge 112 is provided on the inner wall of the smoke exhaust channel 111. When the smoke exhaust channel 111 is closed, the edge of the valve plate 12 is directly opposite to the sealing edge 112, and the sealing edge 112 provides support for the valve plate 12.

[0039] The valve plate 12 is movably mounted on the seat 11 and can selectively open or close the exhaust channel 111 according to the flow state of the oil fumes. The sealing plate 13 at least partially covers the part corresponding to the valve plate 12 and the sealing edge 112. When the valve plate 12 closes the exhaust channel 111, the sealing plate 13 cooperates with the sealing edge 112 to close the exhaust channel 111. The connector 14 connects the valve plate 12 and the sealing plate 13, so that the valve plate 12, the sealing plate 13 and the connector 14 are arranged sequentially in the thickness direction. The connector 14 strengthens the connection strength between the valve plate 12 and the sealing plate 13, ensures the stability of the connection between the valve plate 12 and the sealing plate 13, and prevents the sealing plate 13 from falling off the valve plate 12 during long-term use.

[0040] Specifically, the portion of the exhaust duct 111 located below the sealing edge 112 is called the air intake duct, and the portion located above the sealing edge 112 is called the exhaust duct. When the range hood is running, the fumes flow from the air intake duct to the exhaust duct, pushing the valve plate 12 to open and connecting the air intake duct and the exhaust duct. At this time, the sealing plate 13 separates from the sealing edge 112 and no longer seals the edge of the valve plate 12 with the sealing edge 112. When the range hood stops running, the valve plate 12 returns to its original position and abuts against the sealing edge 112, and the sealing plate 13 contacts the sealing edge 112 to close the exhaust duct. 111 closes and keeps the air intake passage sealed to prevent residual oil fumes from flowing back into the exhaust passage; when oil fumes flow back into the public flue, the backflowing airflow enters the exhaust passage and exerts pressure on the valve plate 12 toward the air intake passage. Since the sealing edge 112 supports the valve plate 12, the valve plate 12 is squeezed toward the sealing edge 112, and the sealing plate 13 contacts the sealing edge 112 and deforms. The sealing plate 13 can tightly fit the surface of the sealing edge 112 and fill the gap between the sealing edge 112 and the sealing plate 13 to maintain the sealing effect of the exhaust passage 111.

[0041] The check valve assembly 1 is equipped with a connector 14, which connects the sealing plate 13 to the valve plate 12. This further strengthens the stability of the connection between the valve plate 12 and the sealing plate 13, preventing the valve plate 12 and the sealing plate 13 from failing in a high-temperature oil fume environment. It also ensures that the sealing plate 13 will not fall off the valve plate 12, guaranteeing the reliability of the fit between the sealing plate 13 and the sealing edge 112. The sealing plate 13 is connected to the valve plate 12 through the connector 14, ensuring the stability of the fit between the valve plate 12 and the sealing edge 112 when the exhaust channel 111 is closed, thus ensuring a stable seal.

[0042] It should be noted that at least a portion of the sealing plate 13 covers the portion of the valve plate 12 corresponding to the sealing edge 112. When the oil fume backflows and the valve plate 12 is squeezed and moves toward the sealing edge 112, the sealing plate 13 is positioned on the side of the valve plate 12 facing the sealing edge 112 and contacts the sealing edge 112 to seal the exhaust channel 111, preventing oil fume from leaking from the gap between the valve plate 12 and the sealing edge 112.

[0043] According to the check valve assembly of this application, a sealing edge 112 is provided in the smoke exhaust channel 111, which provides a stable mating surface for the valve plate. A sealing sheet 13 is provided on the valve plate 12, which cooperates with the sealing edge 112 to enhance the sealing fit. A connector 14 is provided to connect the valve plate 12 and the sealing sheet 13 to improve the stability of the connection between the valve plate 12 and the sealing sheet 13. When the valve plate 12 closes the smoke exhaust channel 111, the sealing sheet 13 cooperates with the sealing edge 112. The sealing sheet 13 can be constructed as a flexible part. The sealing sheet 13 is squeezed by the valve plate 12 through elastic deformation to further improve the sealing effect between the sealing sheet 13 and the sealing edge 112, effectively solving the smoke leakage problem of the check valve assembly.

[0044] According to some embodiments of the present application, in the check valve assembly 1, at least a portion of the valve plate 12 and the sealing plate 13 are spaced apart to define a deformation cavity, and at least a portion of the deformation cavity is disposed corresponding to the sealing edge 112 to be adapted for the sealing plate 13 to deform toward the deformation cavity.

[0045] This application defines a deformation cavity by at least partially separating the valve plate 12 and the sealing plate 13. Under normal conditions, such as when the range hood stops operating and there is no backflow of oil fumes, the valve plate 12 is supported by the sealing edge 112, and the sealing plate 13 is in contact with the sealing edge 112. When backflow of oil fumes occurs in the common flue, the airflow enters the exhaust channel and exerts pressure on the valve plate 12 towards the intake channel. The valve plate 12 is squeezed and displaced towards the sealing edge 112. Since a deformation cavity is formed between the valve plate 12 and the sealing plate 13, the sealing plate 13 is squeezed by the sealing edge 112 and indented towards the deformation cavity. This makes the deformation of the sealing plate 13 significantly increase when under pressure. The larger deformation increases the contact area between the sealing plate 13 and the sealing edge 112, further filling the gap between the sealing plate 13 and the sealing edge 112, and improving the sealing effect of the valve plate 12 on the exhaust channel 111.

[0046] This application increases the deformation of the sealing sheet 13 by setting a deformation cavity, thereby increasing the contact area between the sealing sheet 13 and the sealing edge 112 and improving the sealing effect of the check valve assembly 1.

[0047] It should be noted that the connector 14 avoids the position of the deformation cavity to ensure that the part of the sealing sheet 13 facing the deformation cavity is not affected by the connector 14, so that the sealing sheet 13 can deform freely into the cavity.

[0048] According to some embodiments of the present application, the check valve assembly 1 has a connecting rod 161 in the smoke exhaust channel 111, which divides the smoke exhaust channel 111 into a first smoke exhaust hole and a second smoke exhaust hole. The sealing edge 112 is arranged around the edge of the first smoke exhaust hole and the second smoke exhaust hole. The valve plate 12 is constructed as two, which can selectively close the first smoke exhaust hole and the second smoke exhaust hole respectively.

[0049] Understandably, the sealing edge 112 is set around the edges of the first and second smoke exhaust holes, so that the sealing edge 112 can seal and protect the two smoke exhaust holes. The surrounding sealing edge can fit more fully with the edge of the smoke exhaust hole, reducing gaps caused by mismatch between the sealing edge and the edge of the smoke exhaust hole, and reducing the possibility of oil fume leakage.

[0050] There are two valve plates 12, and the two valve plates 12 can selectively close the first smoke exhaust hole and the second smoke exhaust hole respectively. Each valve plate 12 is matched with the corresponding smoke exhaust hole. In the closed state, the valve plate 12 can tightly cover the corresponding smoke exhaust hole. When the range hood is running and the oil fumes flow from the air intake channel to the exhaust channel, the two valve plates 12 rotate around the corresponding rotation axis to open or close the corresponding smoke exhaust hole.

[0051] It should be noted that the exhaust duct 111 is equipped with a connecting rod 161, which divides the exhaust duct 111 into a first exhaust port and a second exhaust port. Since the valve plate 12 needs to rotate around the connection point of the exhaust duct 111 during opening, if there is no gap between the two valve plates, they will collide and interfere with each other during rotation, causing the valve plates to fail to open and close properly. Therefore, to ensure that the two valve plates 12 can rotate independently and smoothly, a gap needs to be reserved between them. However, the gap between the two valve plates 12 can become a channel for oil fume leakage. When oil fumes backflow into the common exhaust duct, some oil fumes will enter the kitchen through this gap. Therefore, this application places the connecting rod 161 between the two valve plates 12 to seal the gap between them. The connecting rod 161 is provided with a sealing edge 112 around the edges of the first and second smoke exhaust holes. The sealing edge 112 is provided around the edges of the first and second smoke exhaust holes, which can ensure that the valve plate 12 completely seals the two smoke exhaust holes when closing the corresponding smoke exhaust holes. The sealing edge 112 extends continuously along the edges of the first and second smoke exhaust holes, so that the cooperation between the sealing edge 112 and the valve plate 12 eliminates the gap between the smoke exhaust channel 111 and the valve plate 12, thereby enhancing the sealing performance of the check valve assembly 1.

[0052] In some embodiments of this application, such as Figure 4As shown in Figure 6, the cross-section of the connecting rod 161 is V-shaped. The flue pipe connected to the check valve assembly 1 is constantly exposed to fumes, causing grease to accumulate on the inner wall of the seat 11 and drip onto the side of the valve plate 12 facing the exhaust channel. When the range hood is running, the two valve plates 12 approach each other to open the exhaust channel 111, and the grease on the valve plates 12 flows towards the connecting rod 161 along the surface of the valve plates 12. Setting the cross-section of the connecting rod 161 to a V-shape allows it to effectively guide and collect the grease, preventing it from dripping directly into the range hood.

[0053] According to some embodiments of the present application, in the check valve assembly 1, two valve plates 12 are rotatably disposed on the seat 11, and the rotation axes of the two valve plates 12 are parallel to the connecting rod 161 and adjacent to the two side edges in the width direction of the connecting rod 161.

[0054] The valve plate 12's rotating shaft is close to both sides of the connecting rod 161, so that when the valve plate 12 rotates around the shaft to open or close the smoke exhaust passage 111, the movement trajectory of the valve plate 12 around the shaft is closer to the connecting rod 161, reducing the swing amplitude of the valve plate 12 during rotation. The position of the valve plate 12's rotating shaft makes the valve plate 12 fit more closely to the connecting rod 161. When the smoke exhaust hole is closed, the valve plate 12 and the edge of the connecting rod 161 are completely sealed. The valve plate 12 cooperates with the sealing edge 112 provided on the connecting rod 161 to further seal the gap between the valve plate 12 and the connecting rod 161.

[0055] According to some embodiments of the present application, the check valve assembly 1 further includes a reset member. The reset member is disposed on the connecting rod 161 and acts on the two valve plates 12. The reset member is used to drive the valve plates 12 to rotate in the direction of closing the smoke exhaust hole. The function of the reset member is to drive the valve plates 12 to rotate in the direction of closing the smoke exhaust hole. When the range hood is working and exhausting smoke, the thrust generated by the smoke is greater than the driving force of the reset member, pushing the valve plates 12 to overcome the resistance of the reset member and rotate, thereby opening the smoke exhaust hole and ensuring that the smoke is discharged smoothly. When the range hood stops working and the smoke thrust disappears, the reset member releases the stored energy by virtue of its own elastic deformation or mechanical structure characteristics, drives the valve plates 12 to move in the direction of closing the smoke exhaust hole and drives the valve plates 12 to rotate and reset, so that the valve plates 12 re-fit against the sealing edge 112 and close the smoke exhaust hole. When the exhaust port is open, the two valve plates 12 are stuck together. There may be a situation where the oil fumes stick the two valve plates 12 together, which will cause the valve plates 12 to be unable to reset. In this embodiment, a reset component is provided to drive the two valve plates 12 to separate, so as to avoid the situation where the valve plates 12 cannot reset.

[0056] In some embodiments of this application, the reset component includes a torsion spring pin 163 and a torsion spring 162. The torsion spring pin 163 is disposed on the connecting rod 161, and the torsion spring 162 is sleeved on the torsion spring pin 163. Both ends of the torsion spring 162 are respectively connected to two valve plates 12 to drive the valve plates 12 to reset. The torsion spring pin 163 is fixedly disposed on the connecting rod 161, forming an immovable support base point to ensure the stability of the position of the torsion spring 162. Both ends of the torsion spring 162 respectively drive the valve plates 12 to rotate in the direction of closing the smoke exhaust hole, ensuring the reset of the valve plates 12 and maintaining a good sealing state.

[0057] According to some embodiments of the check valve assembly 1 of this application, the outer periphery of the valve plate 12 is provided with a recess 121 opposite to the sealing edge 112. The sealing plate 13 covers the open side of the corresponding recess 121 on the valve plate 12. A deformation cavity is defined within the recess 121 to accommodate deformation of the sealing plate 13 toward the deformation cavity. This application forms a deformation space by providing a recess 121 on the outer edge of the valve plate 12. The valve plate 12 is generally a rigid structure, and providing a recess on the valve plate 12 facilitates processing.

[0058] According to some embodiments of the present application, each valve plate 12 includes a fan-shaped inner plate 1201, a first annular plate 1202 and a second annular plate 1203. The first annular plate 1202 is disposed around the outer periphery of the fan-shaped inner plate 1201. The first annular plate 1202 and the connector 14 are directly opposite each other in the thickness direction. The second annular plate 1203 is disposed around the outer periphery of the first annular plate 1202. The second annular plate 1203 forms a recess 121. The connector 14 at least avoids the portion of the recess 121 that is aligned with the sealing edge 112. The fan-shaped inner plate 1201, the first annular plate 1202 and the second annular plate 1203 are arranged sequentially in the direction away from the smoke inlet side.

[0059] Understandably, each valve plate 12 is equipped with a fan-shaped inner plate 1201 that is adapted to the shape of the exhaust hole after being separated from the exhaust channel 111, so that the valve plate 12 can effectively cover the exhaust hole area. The fan-shaped inner plate 1201 provides a bearing surface for the entire valve plate 12. When flue gas backflows, the fan-shaped inner plate 1201 can evenly bear the flue gas pressure, avoiding excessive local stress that could cause the valve plate 12 to deform, thus ensuring the stability and reliability of the valve plate 12 under normal working conditions.

[0060] The first annular plate 1202 is arranged around the outer periphery of the fan-shaped inner plate 1201 and is directly opposite the connector 14 in the thickness direction, so that the first annular plate 1202 becomes the part where the valve plate 12 and the connector 14 are connected. The connector 14 connects the first annular plate 1202 and the sealing plate 13, ensuring the connection between the sealing plate 13 and the valve plate 12 is stable, preventing the sealing plate 13 from falling off the valve plate 12, ensuring the integrity of the sealing structure, and thus continuously performing the sealing function.

[0061] The second annular plate 1203 is disposed around the outer periphery of the first annular plate 1202 and forms a recess 121. The recess 121 provides deformation space for the sealing sheet 13. When the valve plate 12 moves toward the sealing edge 112, the sealing sheet 13 can deform in the recess 121, thereby increasing the contact area with the sealing edge 112 and improving the sealing effect.

[0062] The connector 14 at least avoids the portion where the recess 121 aligns with the sealing edge 112, thus preventing the connector 14 from interfering with the deformation of the sealing sheet 13. The sealing sheet 13 is deformed by the compression of the sealing edge 112 within the recess 121, and is not restricted by the interference of the connector 14. It can make full use of the space of the recess 121 to achieve maximum deformation, ensuring that the sealing sheet 13 can completely fit the surface of the sealing edge 112 and enhance the sealing effect.

[0063] It should be noted that, as Figure 4 and 5 As shown, the lower side is the air intake channel, and the direction from bottom to top is the direction away from the smoke intake side. The fan-shaped inner plate 1201, the first annular plate 1202 and the second annular plate 1203 are arranged in sequence in the direction away from the smoke intake side and form a stepped structure. The sealing plate 13 is arranged on the side of the smoke intake channel. By setting the fan-shaped inner plate 1201 and the first annular plate 1202 as a stepped structure, the surface of the valve plate 12 facing the air intake channel side can be kept flat after the sealing plate 13 is installed on the valve plate 12.

[0064] In some other embodiments of this application, the fan-shaped inner plate 1201 is provided with a plurality of parallel reinforcing ribs 1211, which can enhance the load-bearing capacity of the fan-shaped inner plate 1201 when subjected to wind force.

[0065] According to some embodiments of the present application, the check valve assembly 1 has a first annular plate 1202 with a dispensing groove 1401 formed on the side facing the sealing sheet 13. A partition rib 1402 is provided between the dispensing groove 1401 and the recess 121 to separate the dispensing groove 1401 from the recess 121.

[0066] The first annular plate 1202 forms a drip groove 1401 on the side facing the sealing sheet 13. During the assembly of the check valve assembly 1, sealant can be filled into the drip groove 1401 to strengthen the connection between the sealing sheet 13 and the valve plate 12. A partition 1402 is provided between the drip groove 1401 and the recess 121 to separate the two. The partition 1402 plays a physical separation role to prevent the sealant in the drip groove 1401 from flowing into the recess 121. Since the recess 121 is the area that provides deformation space for the sealing sheet 13, the sealant is prevented from flowing into the recess 121, which would cause the sealing sheet 13 to stick to the inner wall of the recess 121.

[0067] Furthermore, the rib 1402 enhances the structural strength of the first annular plate 1202. When the valve plate 12 is subjected to external forces such as flue gas pressure and the driving force of the reset component, the rib 1402 can disperse the stress and prevent the first annular plate 1202 from deforming.

[0068] In some embodiments of this application, the partition 1402 may be higher or lower than the plane in which the partition 1402 is located, so as to separate the dispensing groove 1401 from the recess 121.

[0069] According to some embodiments of the present application, the check valve assembly 1 has a first annular plate 1202 with a positioning post, and a threaded hole open toward the exhaust side is formed in the positioning post; the sealing plate 13 and the connector 14 are respectively formed with a first mating hole and a second mating hole corresponding to the positioning post; the fastener 15 passes through the first mating hole and the second mating hole and is connected to the threaded hole of the positioning post.

[0070] In the check valve assembly 1, the first annular plate 1202 forms a positioning post, which has a threaded hole open towards the exhaust side. The sealing plate 13 and the connector 14 are respectively provided with a first mating hole and a second mating hole corresponding to the positioning post. This structural design provides a fixing method for the connection of the valve plate 12, the sealing plate 13 and the connector 14. The corresponding arrangement of the positioning post with the first and second mating holes ensures that the sealing plate 13 and the connector 14 can correspond to the first annular plate 1202 on the valve plate 12 during installation. When the sealing plate 13 is installed in place, it can ensure that the sealing plate 13 matches the corresponding area of ​​the recess 121 and the sealing edge 112 on the outer periphery of the valve plate 12, avoiding misalignment of the sealing surface due to assembly offset. The threaded hole formed in the positioning post, which is open towards the exhaust side, provides an anchoring point for the fastener 15. The fastener 15 passes through the first and second mating holes and connects with the threaded hole of the positioning post. The cooperation between the positioning post and the fastener enhances the overall strength of the structure composed of the valve plate 12, the sealing plate 13 and the connector 14.

[0071] The depth of the threaded hole matches the length of the fastener 15. When the fastener 15 is screwed into the threaded hole, the friction between the threaded pairs will evenly transmit the axial preload to the sealing plate 13 and the connector 14, so that the sealing plate 13 is pressed onto the first annular plate 1202.

[0072] In some embodiments of this application, the threaded hole is constructed as a blind hole, which can prevent oil fumes and oil stains from entering the threaded hole, prevent the threaded pair from decreasing the tightening force due to scale buildup, further improve the sealing structure stability of the check valve assembly 1, and improve the sealing strength of the check valve assembly 1.

[0073] In other embodiments of this application, the first annular plate 1202 is formed with positioning posts, and the sealing sheet 13 and the connector 14 are respectively formed with first mating holes and second mating holes corresponding to the positioning posts, wherein the positioning posts are interference-fitted with the first mating holes and the second mating holes to achieve fixation, such as... Figure 5 and Figure 9 The attached diagram shows how the valve plate, sealing plate, and connecting parts are fixed by interference fit.

[0074] According to some embodiments of the present application, the check valve assembly 1 has a first retaining edge 122 protruding toward the sealing edge 112 on the outer peripheral edge of the valve plate 12, and a second retaining edge 131 protruding toward the valve plate 12 on the outer edge of the sealing plate 13. The first retaining edge 122 and the second retaining edge 131 are at least partially overlapped in the radial direction; wherein the first retaining edge 122 is disposed inside the second retaining edge 131, or the first retaining edge 122 is disposed outside the second retaining edge 131.

[0075] The first flange 122 on the outer periphery of the valve plate 12 and the second flange 131 on the outer periphery of the sealing plate 13 at least partially overlap radially. This means that when flue gas attempts to leak, it must bypass the first flange 122 and the second flange 131. When flue gas leaks from the gap between the valve plate 12 and the sealing edge 112, it must first pass through the radial gap between the first flange 122 and the second flange 131, then turn to the axial gap, and finally overflow. This labyrinthine path significantly increases the leakage resistance, which is equivalent to increasing the length of the sealing path. At the same time, when the pressure inside the flue increases, the sealing plate 13 is squeezed and deformed towards the valve plate 12, increasing the overlap between the second flange 131 and the first flange 122, further reducing the radial gap.

[0076] It should be noted that whether the first stop 122 is on the inner side or the first stop 122 is on the outer side, a labyrinth seal can be formed, which can enhance the sealing effect. By extending the oil fume leakage path, the sealing resistance is increased, which can effectively enhance the sealing effect.

[0077] In some embodiments of this application, the inner edge of the sealing edge 112 is formed with a stop portion 1121 protruding toward the valve plate 12, and the thickness of the stop portion 1121 gradually decreases in the direction toward the valve plate 12.

[0078] Understandably, the tapered shape of the stop portion 1121 ensures that when the valve plate 12 closes and contacts the sealing edge 112, the tip of the stop portion 1121 will contact the valve plate 12 first. The tapered shape of the stop portion 1121 reduces the contact area. According to the pressure formula P=F / S, when the backflow pressure of the oil fume remains constant, the pressure at the contact point increases significantly, thereby effectively embedding into the surface of the valve plate 12 to achieve initial sealing and fill the gap. As the valve plate 12 continues to close, the stop portion 1121 gradually undergoes elastic deformation under force, increasing the contact area and further enhancing the sealing effect, ensuring a tight fit between the valve plate 12 and the sealing edge 112, and effectively preventing flue gas leakage.

[0079] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0080] In the description of this application, "first feature" and "second feature" may include one or more of the features.

[0081] In the description of this application, "multiple" means two or more.

[0082] In the description of this application, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or it may include the first and second features not being in direct contact but being in contact through another feature between them.

[0083] In the description of this application, the terms "above," "over," and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicate that the first feature is at a higher horizontal level than the second feature.

[0084] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0085] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A check valve assembly, characterized in that, include: The seat (11) has a smoke exhaust channel (111) inside which flows along the exhaust direction of the smoke machine, and a sealing edge (112) is provided on the inner wall of the smoke exhaust channel (111). Valve plate (12), which is movably disposed on the seat (11) to selectively open or close the smoke exhaust channel (111); A sealing plate (13), at least a portion of which covers the portion of the valve plate (12) corresponding to the sealing edge (112), to cooperate with the sealing edge (112) to close the smoke exhaust passage (111) when the valve plate (12) closes the smoke exhaust passage (111); A connector (14) connects the valve plate (12) to the sealing plate (13), and the valve plate (12), the sealing plate (13) and the connector (14) are arranged sequentially in the thickness direction.

2. The check valve assembly according to claim 1, characterized in that, At least a portion of the valve plate (12) and the sealing plate (13) are spaced apart to define a deformation cavity, the deformation cavity being at least partially disposed corresponding to the sealing edge (112) to be adapted for the sealing plate (13) to deform toward the deformation cavity.

3. The check valve assembly according to claim 1, characterized in that, The smoke exhaust channel (111) is provided with a connecting rod (161), which divides the smoke exhaust channel (111) into a first smoke exhaust hole and a second smoke exhaust hole. The sealing edge (112) is arranged around the edge of the first smoke exhaust hole and the second smoke exhaust hole. The valve plate (12) is constructed as two and can selectively close the first smoke exhaust hole and the second smoke exhaust hole respectively.

4. The check valve assembly according to claim 3, characterized in that, The two valve plates (12) are rotatably disposed on the seat (11), and the rotation axes of the two valve plates (12) are parallel to the connecting rod (161) and adjacent to the two side edges of the connecting rod (161) in the width direction.

5. The check valve assembly according to claim 3, characterized in that, The check valve assembly (1) further includes a reset member, which is disposed on the connecting rod (161) and acts on the two valve plates (12). The reset member is used to drive the valve plates (12) to rotate toward the direction of closing the smoke exhaust hole.

6. The check valve assembly according to any one of claims 1 to 5, characterized in that, The outer periphery of the valve plate (12) is provided with a recess (121) that is directly opposite to the sealing edge (112). The sealing plate (13) covers the open side of the recess (121) on the corresponding valve plate (12). The recess (121) defines a deformation cavity to accommodate the deformation of the sealing plate (13) toward the deformation cavity.

7. The check valve assembly according to claim 6, characterized in that, Each of the valve plates (12) includes: Fan-shaped inner plate (1201); A first annular plate (1202) is arranged around the outer periphery of the fan-shaped inner plate (1201), and the first annular plate (1202) and the connector (14) are directly opposite each other in the thickness direction. A second annular plate (1203) is disposed around the outer periphery of the first annular plate (1202), and the second annular plate (1203) forms the recess (121). The connector (14) at least avoids the portion of the recess (121) that aligns with the sealing edge (112). The fan-shaped inner plate (1201), the first annular plate (1202), and the second annular plate (1203) are arranged sequentially in the direction away from the smoke inlet side.

8. The check valve assembly according to claim 7, characterized in that, The first annular plate (1202) has a drip groove (1401) formed on the side facing the sealing sheet (13), and a partition rib (1402) is provided between the drip groove (1401) and the recess (121) to separate the drip groove (1401) from the recess (121).

9. The check valve assembly according to claim 7, characterized in that, The first annular plate (1202) has a positioning post, and the positioning post has a threaded hole that opens toward the exhaust side; The sealing sheet (13) and the connector (14) are respectively provided with a first mating hole and a second mating hole corresponding to the positioning post; the fastener (15) passes through the first mating hole and the second mating hole and is connected to the threaded hole of the positioning post.

10. The check valve assembly according to claim 1, characterized in that, The outer peripheral edge of the valve plate (12) has a first retaining edge (122) protruding toward the sealing edge (112), and the outer edge of the sealing plate (13) has a second retaining edge (131) protruding toward the valve plate (12). The first retaining edge (122) and the second retaining edge (131) are at least partially overlapping in the radial direction. The first stop (122) is disposed on the inner side of the second stop (131), or the first stop (122) is disposed on the outer side of the second stop (131).

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