A one-way valve

Abstract

In the installation, the seal needs to be deformed in the radial direction until the seal passes the limiting part or the flange part. Due to the arrangement of the sealing part and the clamping part in the axial direction, the clamping part is located inside the sealing part, and the clamping part of the seal bears the stress when the seal is deformed in the installation; and due to the elastic deformation of the clamping part in the radial direction, the deformation of the seal is concentrated on the clamping part, which is beneficial to reduce the elastic deformation of the sealing part, thereby reducing the risk of permanent deformation and damage of the sealing part, thereby reducing the risk of leakage between the sealing part and the external member.

Description

Technical Field

[0001] This application relates to the field of thermal management technology, specifically to a one-way valve for vehicles. Background Technology

[0002] In related technologies, check valves often employ O-rings to improve sealing and reduce leakage at the sealing point. To prevent the O-ring from detaching from the sealing part, an annular groove is formed on the outer periphery of the sealing part to accommodate the O-ring, effectively limiting its position. When fitting the O-ring into the groove, its inner diameter needs to be increased to allow it to fit. Since O-rings are typically made of rubber or other elastic materials, excessive expansion during installation can lead to overstretching and permanent deformation, affecting the sealing effect and potentially causing leakage. Conversely, insufficient material elasticity can damage the O-ring during expansion, potentially causing cracks or breakage at the sealing point, resulting in decreased sealing performance. Therefore, minimizing the risk of leakage due to permanent deformation or damage during installation has been a key research focus for those skilled in the art. Summary of the Invention

[0003] One objective of this application is to provide a one-way valve that helps reduce the risk of leakage at the sealing point due to permanent deformation or damage to the seal during installation.

[0004] To achieve the above objectives, this application adopts the following technical solution: a one-way valve, characterized in that the one-way valve includes a valve body, the valve body includes a flange portion and a limiting portion, the limiting portion and the flange portion are located on the outer periphery of the valve body, the one-way valve includes a sealing element, the sealing element includes a sealing portion and a snap-fit ​​portion, the limiting portion is located on one side of the snap-fit ​​portion, and the flange portion is located on the other side of the snap-fit ​​portion; the arrangement direction of the flange portion and the limiting portion is defined as the axial direction of the one-way valve; a reference plane A is defined. Perpendicular to the axial direction of the one-way valve, the projection of the snap-fit ​​portion on reference plane A at least partially coincides with the projection of the flange portion on reference plane A, and the projection of the snap-fit ​​portion on reference plane A at least partially coincides with the projection of the limiting portion on reference plane A; the sealing portion is capable of abutting against an external component, the sealing portion and the snap-fit ​​portion are arranged along the axial direction of the one-way valve, and along the radial direction of the one-way valve, the snap-fit ​​portion is located inside the sealing portion, and the snap-fit ​​portion is capable of elastic deformation at least along the radial direction of the one-way valve.

[0005] In the technical solution of this application, during installation, at least part of the locking portion of the seal is located between the flange portion and the limiting portion. On the reference plane A, the projection of the locking portion coincides with the projection of the flange portion and the limiting portion. The flange portion and the limiting portion limit the locking portion, enhancing the stability of the seal and reducing the risk of the seal falling off the valve body during installation, thus causing leakage. During installation, the seal needs to be expanded and deformed radially until it crosses the limiting portion or the flange portion. Since the sealing portion and the locking portion are arranged axially, and the locking portion is located inside the sealing portion, the locking portion preferentially bears the stress on the seal when it is expanded during installation. Furthermore, since the locking portion can undergo elastic deformation radially, the deformation of the seal is concentrated on the locking portion, which helps to reduce the elastic deformation of the sealing portion, thereby reducing the risk of permanent deformation and damage to the sealing portion, and thus reducing the risk of leakage between the sealing portion and external components. Attached Figure Description

[0006] Figure 1 A cross-sectional structural schematic diagram of one embodiment of the check valve is shown;

[0007] Figure 2 It shows Figure 1 The diagram shows a cross-sectional view of one embodiment of the check valve.

[0008] Figure 3 It shows Figure 2 A partially enlarged view of the check valve shown.

[0009] Figure 4 It shows Figure 3 A three-dimensional structural schematic diagram of one embodiment of the sealing element shown;

[0010] Figure 5 It shows Figure 4 A three-dimensional structural schematic diagram of one embodiment of the seal shown from one angle;

[0011] Figure 6 It shows Figure 5 A cross-sectional schematic diagram of one embodiment of the seal shown;

[0012] Figure 7 It shows Figure 6 A partially enlarged view of one embodiment of the seal shown;

[0013] Figure 8 It shows Figure 7 The diagram shows a cross-sectional view of another embodiment of the check valve.

[0014] 100. Check valve; 200. External component; 1. Valve body; 11. Flange; 111. Sealing surface; 112. Mounting part; 121. Limiting part; 122. Side wall part; 123. First guide surface; 13. Abutment surface; 14. Second guide surface; 2. Seal; 21. Sealing part; 211. First part; 212. Second part; 213. Third part; 22. Snap-fit ​​part; 222. First snap-fit ​​section; 221. Second snap-fit ​​section; 223. Connecting part; 23. Metal layer; 24. Non-metal layer; 31. Valve port; 4. Receiving cavity; 5. Valve core assembly; 6. Mounting hole; 7. Inlet flow channel; 8. Outlet flow channel. Detailed Implementation

[0015] The embodiments are described in detail below with reference to the accompanying drawings.

[0016] To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. In this document, relational terms such as "first" and "second" are used merely to distinguish one component from another with the same name, and do not necessarily require or imply any such actual relationship or order between these components. "Limited connection" in this application includes hinges, snap-fit ​​connections, etc., and "fixed connection" includes welding, bonding, vulcanization fixing, riveting, insert injection molding, etc.

[0017] like Figure 1 As shown, the external component 200 includes a mounting hole 6, and the one-way valve 100 is located in the mounting hole 6. The external component 200 includes an inlet flow channel 7 and an outlet flow channel 8. Fluid flows into the mounting hole 6 from the inlet flow channel 7. When the one-way valve 100 is in the open state, the fluid can pass through the one-way valve 100 and enter the outlet flow channel 8. When the one-way valve 100 is in the closed state, the fluid in the outlet flow channel 8 cannot reverse into the inlet flow channel. The one-way valve 100 has a receiving cavity 4 and includes a valve core assembly 5 located in the receiving cavity 4. The valve body 1 includes an abutment surface 13 and a valve port 31. Along the axial direction of the one-way valve 100, when the one-way valve 100 is in the closed state, the valve core assembly 5 can close the valve port 31. When the one-way valve 100 is in the open state, the valve core can abut against the abutment surface 13. At this time, the valve port 31 is opened, and fluid can enter the valve cavity from the valve port 31 and then flow out from the side of the receiving cavity 4 into the outlet flow channel 8.

[0018] like Figure 2As shown, the one-way valve 100 includes a valve body 1, which includes a flange portion 11 and a limiting portion 121. The limiting portion 121 and the flange portion 11 are located on the outer periphery of the valve body 1. The one-way valve 100 includes a sealing element 2, which includes a sealing portion 21 and a snap-fit ​​portion 22. Along the axial direction of the one-way valve 100, the flange portion 11 is located on one side of the snap-fit ​​portion 22, and the limiting portion 121 is located on the other side of the snap-fit ​​portion 22. The arrangement direction of the flange portion 11 and the limiting portion 121 is defined as the axial direction of the one-way valve 100. A reference plane A is defined as perpendicular to the one-way valve 100. In the axial direction of valve 100, the projection of the locking portion 22 on reference plane A at least partially coincides with the projection of the flange portion 11 on reference plane A, and the projection of the locking portion 22 on reference plane A at least partially coincides with the projection of the limiting portion 121 on reference plane A. The sealing portion 21 can abut against the external component 200. The sealing portion 21 and the locking portion 22 are arranged along the axial direction of the one-way valve 100. Along the radial direction of the one-way valve, the locking portion 22 is located inside the sealing portion 21, and the locking portion 22 can elastically deform at least along the radial direction of the one-way valve. The side closer to the central axis of the one-way valve is defined as the inner side, and the side farther from the central axis of the one-way valve is defined as the outer side.

[0019] During installation, at least part of the locking portion 22 of the seal 2 is located between the flange portion 11 and the limiting portion 121. On the reference plane A, the projection of the locking portion 22 coincides with the projection of the flange portion 11 and the limiting portion 121. The flange portion 11 and the limiting portion 121 limit the locking portion 22, which enhances the stability of the seal 2 and helps to reduce the risk of the seal 2 falling off the valve body 1 during installation and causing leakage.

[0020] The sealing part 21 can abut against the external component 200 to achieve a sealing effect. During installation, the sealing element 2 needs to be expanded and deformed in the radial direction until the sealing element 2 passes the limiting part 121 or the flange part 11. Since the sealing part 21 and the snap-fit ​​part 22 are arranged axially, and the snap-fit ​​part 22 is located inside the sealing part 21, the snap-fit ​​part 22 preferentially bears the stress when the sealing element 2 is expanded during installation. Furthermore, since the snap-fit ​​part 22 can undergo elastic deformation in the radial direction, the force when the sealing element 2 is expanded and deformed is concentrated in the snap-fit ​​part 22, reducing the elastic deformation of the sealing part 21. This helps to reduce the risk of permanent deformation and damage to the sealing part 21, thereby reducing the risk of leakage between the sealing part 21 and the external component 200.

[0021] like Figure 3As shown, this application discloses a one-way valve 100, in which the snap-fit ​​portion 22 and the sealing portion 21 are fixedly connected or integrally structured. Compared with the scheme where the snap-fit ​​portion 22 and the sealing portion 21 are separately arranged, the fixed connection or integral structure has greater strength, which helps to avoid the breakage of the connection between the snap-fit ​​portion 22 and the sealing portion 21 due to the expansion deformation of the seal. Furthermore, the sealing portion 21 and the snap-fit ​​portion 22 extend in different directions. The sealing portion 21 extends radially from the snap-fit ​​portion 22 along the one-way valve 100, and the radial extension of the sealing portion 21 further moves away from the side wall portion 122, which further helps to reduce the impact of the expansion deformation of the seal 21 on the sealing part where the sealing portion 21 abuts against the external component. The snap-fit ​​portion 22 extends axially from the sealing portion 21 along the one-way valve 100. Compared with the scheme where the snap-fit ​​portion 22 extends radially, the axial extension makes the length of the snap-fit ​​portion longer in the axial direction. Referring to the lever principle, the longer the axial length of the snap-fit ​​portion, the more conducive it is to the deformation of the snap-fit ​​portion in the radial direction. The snap-fit ​​portion 22 is bent relative to the sealing portion 21. Preferably, the snap-fit ​​portion 22 and the sealing portion 21 are integrally structured, which can further reduce the risk of breakage due to stress concentration at the connection between the snap-fit ​​portion 22 and the sealing portion 21, and is beneficial to reducing processing costs. It is worth noting that the angle between the extension direction of the snap-fit ​​portion 22 and the axial direction of the one-way valve 100 is within the range of -45° to 45° and can be regarded as the snap-fit ​​portion 22 extending along the axial direction of the one-way valve 100; the angle between the extension direction of the sealing portion 21 and the radial direction of the one-way valve 100 is within the range of -45° to 45° and can be regarded as the sealing portion 21 extending along the radial direction of the one-way valve 100.

[0022] Compared to the method where the O-ring is fitted onto the wall of the valve body 1, during the installation of the seal 2, only the snap-fit ​​portion 22 rubs against the wall of the valve body 1. The sealing portion 21, which abuts against the external component 200 to achieve a sealing effect, does not rub against the circumferential outer wall of the valve body 1. This reduces the risk of leakage due to friction damage to the sealing portion 21. Furthermore, the inventors discovered that in related technologies, because the cross-section of the O-ring is circular, the O-ring may roll due to friction when it is fitted. At this time, there is a risk of torsion on the inner and outer surfaces of the O-ring, which may cause the sealing surface 111 of the O-ring to fail to fit evenly against the valve body 1, resulting in leakage. In this application, the snap-fit ​​portion 22 of the seal 2 is bent relative to the sealing portion 21. The snap-fit ​​portion 22 extends axially and the sealing portion 21 extends radially, making the cross-section of the seal 2 non-circular. This reduces the possibility of friction rolling of the seal 2 to a certain extent, thereby helping to reduce the risk of torsion.

[0023] like Figure 2As shown, in some embodiments, the valve body 1 includes a sidewall portion 122 located on the outer periphery of the valve body 1. Along the axial direction of the one-way valve 100, a limiting portion 121 extends radially outward relative to the sidewall portion 121. A sealing portion 21 surrounds the sidewall portion 122, and a snap-fit ​​portion 22 abuts against the sidewall portion 122. The inner diameter of the snap-fit ​​portion 22 is smaller than the outer diameter of the limiting portion 121. The limiting portion 121 limits the snap-fit ​​portion 22, reducing the risk of leakage caused by the seal 2 dislodging from the sealing portion 21. Furthermore, since the snap-fit ​​portion 22 abuts against the sidewall portion 122, it helps improve the alignment of the seal 2, reducing the risk of leakage due to misalignment of the seal 2 during installation.

[0024] like Figures 4 to 7 As shown, in some embodiments of the snap-fit ​​portion 22, the snap-fit ​​portion 22 includes a first snap-fit ​​section 222, which is located at one end of the snap-fit ​​portion 22 near the sealing portion 21. The first snap-fit ​​section 222 is integral with the sealing portion 21. The first snap-fit ​​section 222 forms an angle with the axis of the one-way valve 100. Preferably, the angle between the first snap-fit ​​section 222 and the axis of the one-way valve 100 is greater than 0° and less than 45°. The first snap-fit ​​portion 222 extends radially outward from the connecting portion 223 towards the one-way valve 100. The first snap-fit ​​section 222 is inclined relative to the side wall portion 122, which reduces the contact friction area between the snap-fit ​​portion 22 and the outer periphery of the valve body 1 during installation of the seal 2. This helps to reduce the friction force of the seal 2 during installation and reduces the installation difficulty. Furthermore, the first snap-fit ​​section 222 can play a guiding role when assembling the seal 2.

[0025] The snap-fit ​​portion 22 includes a connecting portion 223 and a second snap-fit ​​section 221. The connecting portion 223 is located at the junction of the first snap-fit ​​portion 222 and the second snap-fit ​​portion 221. The second snap-fit ​​portion 221 extends radially outward from the connecting portion 223 towards the one-way valve 100. The second snap-fit ​​section 221 has an angle relative to the axial direction of the one-way valve 100. Preferably, the angle between the second snap-fit ​​section 221 and the axis of the one-way valve 100 is greater than 0° and less than 45°. This gives the second snap-fit ​​section 221 a raised structure. When disassembling the seal 2, the second snap-fit ​​section 221 can be held and dragged by hand, providing a force point for the disassembly and assembly of the seal 2. Furthermore, the second snap-fit ​​section 221 acts as a guide when disassembling the seal 2, facilitating the release of the snap-fit ​​portion 22. It is worth noting that in some embodiments of the snap-fit ​​portion 22, the structure of the second snap-fit ​​portion 221 may not be included.

[0026] When the first locking section 222 and the second locking section 221 are both at an angle to the axial direction of the one-way valve 100, the area of ​​contact and friction between the locking part 22 and the side wall of the valve body 1 can be further reduced.

[0027] like Figures 4 to 5 As shown, in some embodiments, the number of snap-fit ​​portions 22 is greater than or equal to two, and the snap-fit ​​portions 22 are evenly distributed circumferentially along the side wall portion 122, which is beneficial to improving the centering of the seal 2 and reducing the risk of leakage caused by the seal 2 shifting during installation.

[0028] like Figure 2 As shown, in some embodiments of the flange portion 11, the flange portion 11 extends radially outward relative to the side wall portion 122. The flange portion 11 includes a sealing surface 111. Along the axial direction of the one-way valve 100, the sealing surface 111 is located on one side of the sealing portion 21, and the external member 200 is located on the other side of the sealing portion 21. The sealing portion 21 is located between the sealing surface 111 of the flange portion 11 and the external member 200, which can prevent external leakage. Furthermore, the snap-fit ​​portion 22 achieves positioning and centering by abutting against the wall of the side wall portion 122, and the sealing portion 21 achieves sealing by abutting against the sealing surface 111 and the external member 200. The sealing surface 111 is not coplanar with the wall of the side wall portion 122, which reduces the impact on the sealing portion 21 during installation. In the cross-section through the snap-fit ​​portion 22, the cross-section of the seal 2 is generally "L" shaped.

[0029] like Figure 2 As shown, the flange portion 11 may also include a mounting portion 112. The mounting portion 112 can be limited or fixedly connected to the external component 200. Along the axial direction of the one-way valve 100, the mounting portion 112 is away from the limiting portion 121 relative to the sealing surface 111. The mounting portion 112 is located on the circumferential outer wall of the flange portion 11. The mounting portion 112 can be threaded, and the inner wall of the mounting hole 6 has threads that engage with the mounting portion 112. During installation, by screwing the one-way valve 100 into the mounting hole 6, the threads of the mounting portion 112 and the mounting hole 6 engage. The depth of screwing can also be adjusted as needed. To a certain extent, the deeper the one-way valve 100 is screwed in, the closer the distance between the sealing surface 111 and the wall of the mounting hole 6, the greater the degree of pressure deformation of the sealing portion 21, and the better the sealing effect. Or, as Figure 8 The mounting part 112 shown is located at the end of the flange part 11 away from the limiting part 121. The mounting part 112 can be limited by abutting against the retaining ring, and the retaining ring prevents the one-way valve 100 from disengaging from the mounting hole 6.

[0030] like Figure 2As shown, in some embodiments of the valve body 1, the limiting portion 121 includes a first guide surface 123. Along the axial direction of the one-way valve 100, the first guide surface 123 is located at one end face of the limiting portion 121 near the flange portion 11. The guide surface surrounds the side wall portion 122 circumferentially around the one-way valve 100. Along the direction away from the flange portion 11, the outer diameter of the first guide surface gradually increases, and / or, the limiting portion 121 includes a second guide surface 14. Along the axial direction of the one-way valve 100, the second guide surface 14 is located at one end face of the limiting portion 121 away from the flange portion 11. Along the direction away from the flange portion 11, the inner diameter of the second guide surface 14 gradually decreases. This design, by incorporating a first guide surface 123 and a second guide surface 14 that are axially inclined to the one-way valve 100, prevents the edges of the limiting part 121 from scratching the seal 2 during installation. Furthermore, these guide surfaces act as guides for the locking part 22, which slides on the valve body 1, reducing the difficulty of the locking part 22 engaging with the limiting part 121 and the flange part 11, and also reducing the difficulty of the locking part 22 disengaging from the limiting part 121 and the flange part 11. In addition, by providing the gradually expanding first and second guide surfaces, progressive elastic deformation can occur when the locking part slides against the guide surfaces. Simultaneously, the first guide surface 123 and the second guide surface 14 guide the installation and removal of the seal 2, making it easier to assemble and disassemble.

[0031] like Figure 6 As shown, in some embodiments of the seal 2, the sealing portion 21 includes a first portion 211, a second portion 212, and a third portion 213. The second portion 212 connects the first portion 211 and the third portion 213. The first portion 211 and the third portion 213 are plate-shaped. Along the radial direction of the one-way valve 100, the first portion 211 is farther away from the side wall portion 122 relative to the second portion 212. When the sealing portion 21 is not under pressure, the first portion 211 is closer to the sealing surface 111 relative to the third portion 213, or the third portion 213 is closer to the sealing surface 111 relative to the first portion 211. During the research process, the inventors discovered that compared with ordinary gaskets, corrugated gaskets have a smaller contact area with the sealing surface 111. Under the same pressure, the corrugated gasket deforms more under pressure, resulting in a better sealing effect. Therefore, when the corrugated sealing portion 21 deforms under pressure and adheres to the sealing surface 111, a better sealing effect can be achieved.

[0032] like Figure 7As shown, the sealing element 2 includes a metal layer 23 and a non-metallic layer 24. The non-metallic layer 24 covers the outer surface of the metal layer 23. A portion of the metal layer 23 is located inside the snap-fit ​​portion 22, and another portion of the metal layer 23 is located inside the sealing portion 21. The aforementioned corrugated sealing element 2 is a composite layer structure, made of both metal and non-metallic materials. The non-metallic material covers the surface of the metal material, allowing the snap-fit ​​portion 22 to deform while also being able to rebound. This also gives the sealing portion 21 good sealing performance as well as good pressure resistance. During the research process, the inventors discovered that when the one-way valve 100 operates in a high-pressure environment, the O-ring may be squeezed into the gap of the mating parts, resulting in extrusion damage and even permanent deformation. Furthermore, rubber is prone to stress relaxation under high pressure, losing elasticity and leading to seal failure. The corrugated gasket, due to its internal metal skeleton, has high structural strength, which helps maintain its shape under high pressure and reduces the risk of permanent deformation of the gasket; and the external non-metallic material provides better sealing performance. Therefore, this application uses the aforementioned corrugated gasket as the seal 2, which not only has good sealing performance, but also helps the seal 2 maintain its shape under high pressure, reducing the risk of permanent deformation of the seal 2.

[0033] It should be noted that the above embodiments are only used to illustrate the present invention and are not intended to limit the technical solutions described in the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still make modifications or equivalent substitutions to the present invention. All technical solutions and improvements that do not depart from the spirit and scope of the present invention should be covered within the scope of the claims of the present invention.

Claims

1. A one-way valve, characterized in that, The one-way valve (100) includes a valve body (1), which includes a flange (11) and a limiting part (121). The limiting part (121) and the flange (11) are located on the outer periphery of the valve body (1). The one-way valve (100) includes a sealing element (2), which includes a sealing part (21) and a snap-fit ​​part (22). The limiting part (121) is located on one side of the snap-fit ​​part (22), and the flange (11) is located on the other side of the snap-fit ​​part (22). The arrangement direction of the flange (11) and the limiting part (121) is defined as the axial direction of the one-way valve (100). A reference plane A is defined as perpendicular to the one-way valve. Along the axial direction of the valve (100), the projection of the snap-fit ​​portion (22) on the reference plane A at least partially coincides with the projection of the flange portion (11) on the reference plane A, and the projection of the snap-fit ​​portion (22) on the reference plane A at least partially coincides with the projection of the limiting portion (121) on the reference plane A; the sealing portion (21) can abut against the external component (200), the sealing portion (21) and the snap-fit ​​portion (22) are arranged along the axial direction of the one-way valve (100), and along the radial direction of the one-way valve, the snap-fit ​​portion (22) is located inside the sealing portion (21), and the snap-fit ​​portion (22) can elastically deform at least along the radial direction of the one-way valve (100).

2. The one-way valve according to claim 1, characterized in that, The snap-fit ​​portion (22) is fixedly connected to or integral with the sealing portion (21). The sealing portion (21) extends radially from the snap-fit ​​portion (22) along the one-way valve (100), and the snap-fit ​​portion (22) extends axially from the sealing portion (21) along the one-way valve (100).

3. The one-way valve according to claim 2, characterized in that, The valve body (1) includes a side wall portion (122) located on the outer periphery of the valve body (1) along the axial direction of the one-way valve (100). The limiting portion (121) extends radially outward relative to the side wall portion (122). The sealing portion (21) surrounds the side wall portion (122). The snap-fit ​​portion (22) abuts against the side wall portion (122). The inner diameter of the side wall portion (122) is smaller than the outer diameter of the limiting portion (121).

4. The one-way valve according to claim 3, characterized in that, The snap-fit ​​portion (22) includes a first snap-fit ​​section (222), which is located at one end of the snap-fit ​​portion (22) near the sealing portion (21). The first snap-fit ​​section (222) is integral with the sealing portion (21). The first snap-fit ​​section (222) forms an angle with the axis of the one-way valve (100). The snap-fit ​​portion (22) includes a connecting portion (223) and a second snap-fit ​​section (221). The connecting portion (223) is connected to the side wall portion. (122) Abutting, the second snap-fit ​​portion (223) has an angle with the axis of the one-way valve (100), the connecting portion (223) is located at the connection between the first snap-fit ​​portion (222) and the second snap-fit ​​portion (221), the first snap-fit ​​portion (222) extends obliquely outward from the connecting portion (223) towards the radially outer side of the one-way valve (100), and the second snap-fit ​​portion (221) extends obliquely outward from the connecting portion (223) towards the radially outer side of the one-way valve (100).

5. The one-way valve according to claim 1, characterized in that, The number of the snap-fit ​​parts (22) is greater than or equal to two, and the snap-fit ​​parts (22) are evenly distributed along the circumference of the side wall part (122).

6. The one-way valve according to claim 3, characterized in that, The flange portion (11) extends radially outward relative to the sidewall portion (122), and the flange portion (11) includes a sealing surface (111) along the axial direction of the one-way valve (100), the sealing surface (111) being located on one side of the sealing portion (21).

7. A one-way valve according to claim 6, characterized in that, The flange portion (11) includes a mounting portion (112), which is capable of being limited or fixedly connected to an external component (200). Along the axial direction of the one-way valve (100), the mounting portion (112) is located away from the limiting portion (121) relative to the sealing surface (111). The mounting portion (112) is located on the circumferential outer wall of the flange portion (11), or the mounting portion (112) is located at one end of the flange portion (11) away from the limiting portion (121).

8. A one-way valve according to claim 3, characterized in that, The limiting portion (121) includes a first guide surface (123) along the axial direction of the one-way valve (100). The first guide surface (123) is located at one end face of the limiting portion (121) near the flange portion (11). The guide surface surrounds the side wall portion (122) circumferentially around the one-way valve (100). The outer diameter of the first guide surface gradually increases in the direction away from the flange portion (11). And / or, the limiting portion (121) includes a second guide surface (14) along the axial direction of the one-way valve (100). The second guide surface (14) is located at one end face of the limiting portion (121) away from the flange portion (11). The inner diameter of the second guide surface (14) gradually decreases in the direction away from the flange portion (11).

9. The one-way valve according to any one of claims 1-8, characterized in that, The sealing part (21) includes a first part (211), a second part (212) and a third part (213). The second part (212) connects the first part (211) and the third part (213). The first part (211) and the third part (213) are plate-shaped and are located radially along the one-way valve (100). The first part (211) is away from the side wall part (122) relative to the second part (212). When the sealing part (21) is not under pressure, the first part (211) is closer to the sealing surface (111) relative to the third part (213), or the third part (213) is closer to the sealing surface (111) relative to the first part (211).

10. A one-way valve according to claim 9, characterized in that, The seal (2) includes a metal layer (23) and a non-metal layer (24), the non-metal layer (24) covering the outer surface of the metal layer (23); a portion of the metal layer (23) is located inside the snap-fit ​​portion (22), and another portion of the metal layer (23) is located inside the sealing portion (21).

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