Check valve assembly

Abstract

This utility model discloses a check valve assembly, including a base, two check valve plates, a sealing plate, and a torsion spring assembly. The base has an air inlet section and an air outlet section arranged sequentially along the exhaust direction of the range hood. A connecting rod is provided at the air inlet end of the air outlet section, dividing the air inlet surface of the air outlet section into a first air inlet surface and a second air inlet surface that are symmetrically arranged. A sealing edge is provided around the first and second air inlet surfaces at the air inlet end of the air outlet section. Both check valve plates are rotatably connected to the air inlet end of the air outlet section. The sealing plate is arranged around the edge of the check valve plate facing the air inlet section, forming a deformation cavity between the sealing plate and the check valve plate, with the deformation cavity aligned with the sealing edge. The torsion spring assembly includes a spring pin and a torsion spring. The spring pin is located on the connecting rod, and the two acting ends of the torsion spring act on the two surfaces of the two check valve plates away from the air inlet section, respectively. This utility model's check valve assembly can improve the anti-backflow effect of the check valve assembly.

Description

Technical Field

[0001] This utility model relates to the field of check valve technology, specifically to a check valve assembly. Background Technology

[0002] The backflow preventer assembly is installed in the common flue of the range hood to prevent cooking fumes from flowing back into the kitchen. When no airflow passes through the base, the backflow preventer plates rest against the support edge of the base under their own weight and the action of a torsion spring. During range hood exhaust, the exhaust airflow passes through the inlet section of the backflow preventer assembly and flows towards the exhaust section. As the airflow flows towards the exhaust section, it impacts the backflow preventer plates, causing the two plates to move closer together and open the exhaust section of the base, allowing the airflow entering the inlet section to flow towards the exhaust section and be discharged into the common flue. After the range hood is turned off, if cooking fumes flow back into the common flue, the airflow from the common flue will enter the outlet section of the base. The airflow will then impact the backflow preventer plates in the direction of the inlet section. Due to the restraint of the support edge, the two backflow preventer plates are pressed tightly against the support edge, but airflow can still enter the inlet section through the gap between the backflow preventer plates and the support edge, affecting the backflow prevention effect of the backflow preventer assembly. Utility Model Content

[0003] The purpose of this invention is to provide a check valve assembly that solves the aforementioned technical problems.

[0004] The check valve assembly proposed in this utility model includes a base, two check valve plates, a sealing plate, and a torsion spring assembly. The base is provided with an air inlet section and an air outlet section in sequence along the exhaust direction of the flue. The air inlet end of the air outlet section is provided with a connecting rod, which divides the air inlet surface of the air outlet section into a first air inlet surface and a second air inlet surface that are symmetrical to each other. The air inlet end of the air outlet section is provided with a sealing edge around the first air inlet surface and the second air inlet surface. The two check valve plates are rotatably connected to the air inlet end of the air outlet section. The sealing plate is provided around the edge of the check valve plate on the side facing the air inlet section, and a deformation cavity is formed between the sealing plate and the check valve plate. The deformation cavity is aligned with the sealing edge. The torsion spring assembly includes a spring pin and a torsion spring. The spring pin is provided on the connecting rod, and the two working ends of the torsion spring act on the two surfaces of the two check valve plates away from the air inlet section, respectively.

[0005] According to one embodiment of the present invention, the seat and the connecting rod are provided with a clearance surface arranged around the sealing edge, and the sealing edge extends from the inner edge of the clearance surface toward the direction away from the air inlet section.

[0006] According to one embodiment of the present invention, the surface of the check valve plate facing the air inlet section includes a first surface, a second surface, and a third surface. The second surface is arranged around the first surface, and the third surface is arranged around the second surface. The first surface protrudes from the air inlet section relative to the second surface, and the second surface protrudes from the air inlet section relative to the third surface. The edge of the third surface extends into the air inlet section direction with an extension wall, so that the third surface forms an annular groove located outside the second surface. The sealing plate is installed on the second surface and the third surface, and a deformation cavity is formed between the annular groove and the sealing plate.

[0007] According to one embodiment of the present invention, the sealing sheet has a connecting portion corresponding to the second surface and a deformation groove disposed around the connecting portion. The connecting portion is connected to the second surface, the deformation groove is aligned with the third surface, and the outer edge of the sealing sheet abuts against the inner wall surface of the extension wall.

[0008] According to one embodiment of the present invention, a reset post is provided in the deformation groove. After the force that squeezes the sealing sheet to the sealing edge disappears, the reset post resets the top surface of the deformation groove.

[0009] According to one embodiment of the present invention, the outer edge of the sealing sheet forms an outer ring wall of a deformation groove, the height of the outer ring wall is greater than the height of the inner ring wall of the deformation groove, and the height of the outer ring wall is adapted to the height of the extension wall.

[0010] According to one embodiment of the present invention, a plurality of connecting posts are provided on the second surface, and a connecting hole is provided on the sealing sheet, the connecting hole being connected to the connecting post.

[0011] According to one embodiment of the present invention, a plurality of reinforcing ribs are provided on the first surface.

[0012] According to one embodiment of the present invention, the check valve plate is provided with rotating shafts at both ends, and the connecting rod is provided with first bearing seats at both ends, with the rotating shafts rotatably connected to the first bearing seats.

[0013] According to one embodiment of the present invention, the connecting rod has a V-shaped cross-section, with the protrusion facing the air inlet section. A second bearing seat is provided in the groove of the V-shaped structure, and a spring pin is connected to the second bearing seat.

[0014] Compared with the prior art, the check valve assembly of this utility model has the following advantages:

[0015] The backflow preventer assembly of this utility model has a deformation cavity formed between the sealing plate and the backflow preventer plate. When the oil fumes in the common flue flow backflow, the airflow applies a force to the backflow preventer plate towards the air inlet section. The backflow preventer plate is squeezed against the sealing edge, and the deformation cavity deforms. The gap between the sealing plate and the sealing edge is sealed, preventing the backflowing oil fumes from entering the air inlet section, thereby improving the backflow prevention effect of the backflow preventer assembly. Attached Figure Description

[0016] Figure 1This is a schematic diagram of the structure of the check valve assembly of this utility model;

[0017] Figure 2 This is a schematic diagram of the check valve assembly of this utility model from another direction;

[0018] Figure 3 This is an exploded view of the check valve assembly of this utility model;

[0019] Figure 4 This is a structural cross-sectional view of the check valve assembly of this utility model;

[0020] Figure 5 for Figure 4 A magnified view of a section at point A in the middle;

[0021] Figure 6 for Figure 4 A magnified view of a section at point B in the middle;

[0022] Figure 7 This is a schematic diagram of the structure of the stop valve plate of this utility model.

[0023] In the diagram: a. Deformation cavity, 1. Seat, 11. Air inlet section, 12. Air outlet section, 121. Sealing edge, 122. Clearance surface, 13. Connecting rod, 131. First bearing seat, 132. Second bearing seat, 2. Check valve plate, 21. First surface, 211. Reinforcing rib, 22. Second surface, 221. Connecting column, 23. Third surface, 24. Extension wall, 25. Rotating shaft, 3. Sealing plate, 31. Connecting part, 32. Deformation groove, 321. Reset column, 33. Outer ring wall, 34. Connecting hole, 4. Torsion spring assembly, 41. Spring pin, 42. Torsion spring.

[0024] The implementation and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0025] The following drawings will disclose several embodiments of this utility model. For clarity, many practical details will be described in the following description. However, it should be understood that these practical details should not be used to limit this utility model. That is, in some embodiments of this utility model, these practical details are not essential. In addition, for the sake of simplicity, some conventional structures and components will be shown in the drawings in a simple schematic manner.

[0026] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0027] Furthermore, in this utility model, the use of terms such as "first" and "second" is for descriptive purposes only and does not specifically refer to any order or sequence, nor is it intended to limit the utility model. They are merely used to distinguish components or operations described with the same technical terms and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of various embodiments can be combined with each other, but only if they are feasible for those skilled in the art. If a combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0028] To further understand the content, features, and effects of this utility model, the following embodiments are provided, and detailed descriptions are given below in conjunction with the accompanying drawings:

[0029] This utility model discloses a check valve assembly for use in a range hood. Please refer to [link / reference]. Figures 1 to 6 The check valve assembly proposed in this utility model includes a seat 1, two check valve plates 2, a sealing plate 3, and a torsion spring assembly 4; the seat 1 is provided with an air inlet section 11 and an air outlet section 12 in sequence along the exhaust direction of the flue gas machine; the air inlet end of the air outlet section 12 is provided with a connecting rod 13; the connecting rod 13 divides the air inlet surface of the air inlet end of the air outlet section 12 into a first air inlet surface and a second air inlet surface that are symmetrical to each other; the air inlet end of the air outlet section 12 is provided with a sealing edge 121 around the first air inlet surface and the second air inlet surface; Both check valve plates 2 are rotatably connected to the air inlet end of the air outlet section 12; the sealing plate 3 is arranged around the edge of the check valve plate 2 on the side facing the air inlet section 11, and a deformation cavity a is formed between the sealing plate 3 and the check valve plate 2, and the deformation cavity a is aligned with the sealing edge 121; the torsion spring assembly 4 includes a spring pin 41 and a torsion spring 42, the spring pin 41 is provided on the connecting rod 13, and the two working ends of the torsion spring 42 act on the two surfaces of the two check valve plates 2 away from the air inlet section 11 respectively.

[0030] In this embodiment, the backflow preventer assembly is installed at the air outlet of the range hood and then connected to the flue pipe or public flue in the kitchen to connect the range hood with the flue pipe. Thus, the fumes drawn by the range hood can flow through the backflow preventer assembly to the flue pipe and then be discharged outdoors through the flue pipe.

[0031] The base 1 is tubular or cylindrical. The air inlet section 11 of the base 1 connects to the air outlet of the range hood, while the air outlet section 12 connects to the common flue. A connecting rod 13 is located inside the base 1. Two check valves 2 are rotatably connected to the connecting rod 13. The two check valves 2 and the connecting rod 13 together divide the flow channel of the base 1 into the air inlet section 11 and the air outlet section 12. The two check valves 2 can rotate away from the air inlet section 11 to open the air inlet end of the air outlet section 12, or they can return to their original position towards the air inlet section 11 to close the air inlet end of the air outlet section 12. When the two check valves 2 close the air inlet end of the air outlet section 12, they respectively cover the first and second air inlet surfaces.

[0032] The sealing edge 121 is connected to the inner peripheral wall of the seat 1 and extends circumferentially along the seat 1. When the two check valves 2 close the air inlet end of the air outlet section 12, they abut against the sealing edge 121. Thus, the sealing edge 121 can support and limit the two check valves 2, preventing them from continuing to rotate away from the air outlet section 12. The sealing plate 3 is connected to the side of the two check valves 2 facing away from the air outlet section 12. When the two check valves 2 close the air inlet end of the air outlet section 12, the sealing plate 3 contacts and engages with the sealing edge 121. The position of the sealing plate 3 abutting against the sealing edge 121 corresponds exactly to the deformation cavity a. The deformation cavity a provides deformation space for the sealing plate 3, allowing it to deform into the deformation cavity a under the squeezing action of the sealing edge 121. This deformation of the sealing plate 3 improves the tightness of the contact between the sealing plate 3 and the sealing edge 121, preventing gaps between them.

[0033] Spring pin 41 is used to mount torsion spring 42 on connecting rod 13. The two working ends of torsion spring 42 abut against two check valve plates 2 respectively, thereby providing a reset driving force for the two check valve plates 2 and pressing the two check valve plates 2 against the sealing edge 121.

[0034] As the fumes flow from the air inlet section 11 of the seat 1 to the air outlet section 12, they overcome the resistance caused by the torsion spring 42, causing the torsion spring 42 to deform and push the two check valve plates 2 toward the air outlet section 12, creating a gap between the sealing plate 3 and the sealing edge 121, allowing the fumes to flow through the gap to the air outlet section 12.

[0035] After the force of the oil fumes is dissipated, the torsion spring 42 returns to its original deformation to reset the two check valve plates 2 and press the sealing plate 3 back onto the sealing edge 121.

[0036] In this utility model, a deformation cavity a is formed between the sealing plate 3 and the check valve plate 2. When the oil fumes in the common flue flow back into the air, the airflow exerts a force on the check valve plate 2 toward the air inlet section 11. The check valve plate 2 is squeezed onto the sealing edge 121, and the deformation cavity a deforms. The gap between the sealing plate 3 and the sealing edge 121 is sealed, preventing the backflowing oil fumes from entering the air inlet section 11, thereby improving the backflow prevention effect of the check valve assembly.

[0037] The check valve assembly of this utility model, such as Figures 5 to 6 As shown, the base 1 and the connecting rod 13 are provided with a relief surface 122 around the sealing edge 121, and the sealing edge 121 extends from the inner edge of the relief surface 122 toward a direction away from the air inlet section 11.

[0038] Both the connecting rod 13 and the seat 1 are provided with sealing edges 121. When the check valve plate 2 closes the air inlet end of the air outlet section 12, the part of the sealing plate 3 near the connecting rod 13 abuts against the sealing edge 121 on the connecting rod 13, and the part of the sealing plate 3 near the inner peripheral wall of the seat 1 abuts against the sealing edge 121 on the seat 1. In this way, oil fumes can also be prevented from flowing back from the gap between the connecting rod 13 and the check valve plate 2.

[0039] After the sealing sheet 3 abuts against the sealing edge 121, there is a gap between the clearance surface 122 and the sealing sheet 3, which reduces the contact area between the sealing sheet 3 and the connecting rod 13 and other parts of the seat body 1, thereby increasing the pressure exerted by the sealing edge 121 on the sealing sheet 3, allowing the sealing sheet 3 to deform to a greater extent, thus ensuring the tightness of the contact between the sealing sheet 3 and the sealing edge 121.

[0040] The check valve assembly of this utility model, such as Figures 3 to 4 As shown, the surface of the check valve plate 2 facing the air inlet section 11 includes a first surface 21, a second surface 22, and a third surface 23. The second surface 22 is arranged around the first surface 21, and the third surface 23 is arranged around the second surface 22. The first surface 21 protrudes towards the air inlet section 11 relative to the second surface 22, and the second surface 22 protrudes towards the air inlet section 11 relative to the third surface 23. The edge of the third surface 23 extends towards the air inlet section 11 with an extension wall 24, so that the third surface 23 forms an annular groove located outside the second surface 22. The sealing plate 3 is installed on the second surface 22 and the third surface 23, and a deformation cavity a is formed between the annular groove and the sealing plate 3.

[0041] The second surface 22 is encircled by the first surface 21, and the third surface 23 is encircled by the second surface 22. The first surface 21, the second surface 22, and the third surface 23 together form a stepped structure. The sealing plate 3 is installed on the second surface 22 and the third surface 23, that is, between the first surface 21 and the extension wall 24. In this way, the sealing plate 3 does not need to cover the first surface 21, which saves material for the sealing plate 3. The annular groove extends circumferentially along the second surface 22, and the deformation cavity a is formed between the annular groove and the sealing plate 3. Therefore, the deformation cavity a also extends circumferentially along the second surface 22. Thus, the deformation cavity a has both a part that can correspond to the sealing edge 121 on the connecting rod 13 and a part that can correspond to the sealing edge 121 on the inner peripheral wall of the seat 1, thereby simplifying the formation of the deformation cavity a and improving the processing convenience of the check valve assembly.

[0042] The check valve assembly of this utility model, such as Figures 3 to 4 As shown, the sealing sheet 3 has a connecting portion 31 corresponding to the second surface 22 and a deformation groove 32 provided around the connecting portion 31. The connecting portion 31 is connected to the second surface 22, the deformation groove 32 is aligned with the third surface 23, and the outer edge of the sealing sheet 3 abuts against the inner wall surface of the extension wall 24.

[0043] The connecting part 31 connects to the second surface 22, ensuring sufficient connection area between the sealing plate 3 and the check valve plate 2, thereby improving the connection stability between the sealing plate 3 and the check valve plate 2. The deformation groove 32 and the annular groove together form the deformation cavity a, which increases the depth of the deformation cavity a, that is, increases the space for the sealing plate 3 to deform after being squeezed by the sealing edge 121, so that the sealing plate 3 can deform more fully after being squeezed by the sealing edge 121, thereby further improving the tightness of the contact between the sealing plate 3 and the sealing edge 121. The outer edge of the sealing plate 3 abuts against the inner wall surface of the extension wall 24, so that the extension wall 24 can play a positioning role for the sealing plate 3, thereby making the installation state of the sealing plate 3 on the check valve plate 2 more compact and stable.

[0044] The check valve assembly of this utility model, such as Figure 7 As shown, a reset post 321 is provided in the deformation groove 32. After the force that squeezes the sealing sheet 3 onto the sealing edge 121 disappears, the reset post 321 resets the top surface of the deformation groove 32.

[0045] When fumes from the flue or common flue flow back into the seat 1, the airflow will press the sealing plate 3 against the sealing edge 121. At this time, the sealing plate 3 deforms under the pressure of the sealing edge 121, specifically at the deformation groove 32. The deformation of the reset column 321 after being subjected to force is small, and the diameter of the reset column 321 is small, so it will not affect the overall deformation of the sealing plate 3. The reset column 321 is set in the deformation groove 32. When the deformation groove 32 deforms under pressure, due to the presence of the reset column 321, the top surface of the deformation groove 32 is not easy to stick to the check valve plate 2. When there is no negative pressure in the common flue, the deformation groove 32 can easily reset, continuing to ensure the sealing effect of the sealing plate 3.

[0046] The check valve assembly of this utility model, such as Figures 5 to 6 As shown, the outer edge of the sealing sheet 3 forms the outer annular wall 33 of the deformation groove 32. The height of the outer annular wall 33 is greater than the height of the inner annular wall of the deformation groove 32, and the height of the outer annular wall 33 is adapted to the height of the extension wall 24. In this way, the contact area between the outer annular wall 33 of the sealing sheet 3 and the extension wall 24 can be increased to improve the contact stability; at the same time, the inner annular wall of the deformation groove 32 can be prevented from occupying the space of the annular groove, thereby ensuring that the deformation cavity a formed between the sealing sheet 3 and the annular groove has sufficient volume.

[0047] The check valve assembly of this utility model, such as Figures 3 to 7 As shown, the second surface 22 is provided with several connecting posts 221, and the sealing plate 3 is provided with connecting holes 34. The connecting holes 34 are connected to the connecting posts 221, which can improve the connection strength between the sealing plate 3 and the check valve plate 2 and simplify the connection method between the sealing plate 3 and the check valve plate 2. The multiple connecting posts 221 are arranged at intervals along the circumference of the first surface 21, and the number and position of the connecting holes 34 correspond to the connecting posts 221. In this way, the connection positions between the sealing plate 3 and the check valve plate 2 can be increased, further improving the connection stability.

[0048] The check valve assembly of this utility model, such as Figure 3 As shown, the first surface 21 is provided with several reinforcing ribs 211. The reinforcing ribs 211 can improve the overall structural strength of the check valve plate 2 and prevent the check valve plate 2 from deforming or being damaged after being subjected to various forces for a long time, thereby ensuring the stability of the anti-oil fume backflow effect of the check valve assembly.

[0049] The check valve assembly of this utility model, such as Figures 1 to 3 As shown, the check valve plate 2 has rotating shafts 25 at both ends, and the connecting rod 13 has first bearing seats 131 at both ends. The rotating shafts 25 are rotatably connected to the first bearing seats 131. The rotating shafts 25 and the first bearing seats 131 are rotatably engaged, so that the check valve plate 2 can rotate around the connecting rod 13, thereby simplifying the rotational installation method of the check valve plate 2 in the seat body 1.

[0050] The check valve assembly of this utility model, such as Figure 1and Figure 6 As shown, the cross-section of the connecting rod 13 is V-shaped, with the protrusion facing the air inlet section 11. The groove of the V-shaped structure is provided with a second bearing seat 132, and the spring pin 41 is connected to the second bearing seat 132.

[0051] The connecting rod 13 has a V-shaped cross-section, which can divert the oil fumes rushing towards it. This allows the fumes to be diverted to both sides after impacting the connecting rod 13, flowing along the check valve plate 2 to the gap between the sealing plate 3 and the sealing edge 121 before reaching the outlet section 12. This improves the flow and discharge efficiency of the oil fumes from the check valve assembly. The groove opening of the connecting rod 13 faces the outlet section 12, and this groove provides installation space for the torsion spring assembly 4, thus improving the ease of installation of the torsion spring assembly 4 on the connecting rod 13.

[0052] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions or improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A check valve assembly, characterized in that, include: The base (1) is provided with an air inlet section (11) and an air outlet section (12) in sequence along the exhaust direction of the smoke machine. The air inlet end of the air outlet section (12) is provided with a connecting rod (13). The connecting rod (13) divides the air inlet surface of the air inlet end of the air outlet section (12) into a first air inlet surface and a second air inlet surface that are symmetrical to each other. The air inlet end of the air outlet section (12) is provided with a sealing edge (121) around the first air inlet surface and the second air inlet surface. Two check valve plates (2), both of which are rotatably connected to the air inlet end of the air outlet section (12); A sealing plate (3) is provided around the edge of the check valve plate (2) on the side facing the air inlet section (11), and a deformation cavity (a) is formed between the sealing plate (3) and the check valve plate (2), and the deformation cavity (a) is aligned with the sealing edge (121); The torsion spring assembly (4) includes a spring pin (41) and a torsion spring (42). The spring pin (41) is located on the connecting rod (13), and the two working ends of the torsion spring (42) act on the two surfaces of the two check valve plates (2) away from the air inlet section (11).

2. The check valve assembly according to claim 1, characterized in that, The seat (1) and the connecting rod (13) are provided with a clearance surface (122) around the sealing edge (121), and the sealing edge (121) extends from the inner edge of the clearance surface (122) toward a direction away from the air inlet section (11).

3. The check valve assembly according to claim 1, characterized in that, The check valve plate (2) facing the air inlet section (11) includes a first surface (21), a second surface (22), and a third surface (23). The second surface (22) is arranged around the first surface (21), and the third surface (23) is arranged around the second surface (22). The first surface (21) protrudes towards the air inlet section (11) relative to the second surface (22), and the second surface (22) protrudes towards the air inlet section (11) relative to the third surface (23). The edge of the third surface (23) extends towards the air inlet section (11) with an extension wall (24), so that the third surface (23) forms an annular groove located outside the second surface (22). The sealing plate (3) is installed on the second surface (22) and the third surface (23), and a deformation cavity (a) is formed between the annular groove and the sealing plate (3).

4. The check valve assembly according to claim 3, characterized in that, The sealing sheet (3) has a connecting portion (31) corresponding to the second surface (22) and a deformation groove (32) provided around the connecting portion (31). The connecting portion (31) is connected to the second surface (22), the deformation groove (32) is aligned with the third surface (23), and the outer edge of the sealing sheet (3) abuts against the inner wall surface of the extension wall (24).

5. The check valve assembly according to claim 4, characterized in that, The deformation groove (32) is provided with a reset post (321). After the force that squeezes the sealing sheet (3) onto the sealing edge (121) disappears, the reset post (321) resets the top surface of the deformation groove (32).

6. The check valve assembly according to claim 4, characterized in that, The outer edge of the sealing sheet (3) forms the outer ring wall (33) of the deformation groove (32), the height of the outer ring wall (33) is greater than the height of the inner ring wall of the deformation groove (32), and the height of the outer ring wall (33) is adapted to the height of the extension wall (24).

7. The check valve assembly according to claim 3, characterized in that, The second surface (22) is provided with a plurality of connecting posts (221), and the sealing sheet (3) is provided with connecting holes (34), which are connected to the connecting posts (221).

8. The check valve assembly according to claim 3, characterized in that, The first surface (21) is provided with several reinforcing ribs (211).

9. The check valve assembly according to claim 1, characterized in that, The check valve plate (2) has a rotating shaft (25) at both ends, and the connecting rod (13) has a first bearing seat (131) at both ends. The rotating shaft (25) is rotatably connected to the first bearing seat (131).

10. The check valve assembly according to claim 1, characterized in that, The connecting rod (13) has a V-shaped cross section with the protrusion facing the air inlet section (11). The groove of the V-shaped structure is provided with a second bearing seat (132), and the spring pin (41) is connected to the second bearing seat (132).

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