One-way valve

Abstract

The utility model relates to the technical field of fluid control, in particular to a one-way valve. The one-way valve comprises a valve pipe, a valve seat, a valve body and a valve element, the valve pipe is provided with a first path and a second path for fluid to flow, the valve seat is connected with the valve pipe, the valve body is located between the first path and the second path and connected with the valve seat, the valve body is provided with a first opening and a second opening, and the valve element is installed in the valve body and can move in the axial direction of the valve body. A first stopping protrusion is arranged on the peripheral side of the valve body in a protruding mode, and the first stopping protrusion abuts against the pipe wall of the valve pipe. The stop valve has the advantages that the first stop protrusion capable of abutting against the pipe wall of the valve pipe is arranged on the peripheral side of the valve body in the protruding mode, so that when the valve element and the valve body are closed in a matched mode, the first stop protrusion can bear pressure borne by the valve body through abutting against the pipe wall of the valve pipe, damage is not prone to occurring, the stop valve is more durable, and the limiting effect is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of fluid control, in particular to a one-way valve. Background Art

[0002] One-way valves are generally used in pipeline systems to control the flow of fluid in pipelines. Existing one-way valves usually include a valve seat, a valve body and a valve core. The valve seat and the valve body are connected by a buckle. Fluid can flow in the valve body, and the valve core can move axially in the valve body to close or open the passage in the valve body. When the valve core closes the passage in the valve body, the valve body will be subjected to a pressure load in the direction away from the valve seat. During this process, the buckle is always under force. After being under pressure for a long time or when the pressure is too high, the buckle is prone to breakage. Utility Model Content

[0003] Based on this, the utility model provides a one-way valve for the above technical problem.

[0004] A one-way valve, the one-way valve comprising: a valve tube, the valve tube being configured with a passage for fluid flow, the passage comprising a first passage and a second passage that are connected; a valve seat, the valve seat being connected to the valve tube; a valve body, the valve body being located between the first passage and the second passage and being connected to the valve seat, the outer peripheral side of the valve body being provided with at least one first opening, the side of the valve body away from the valve seat being provided with a second opening, the first opening being connected with the first passage, the second opening being connected with the second passage, and the first opening and the second opening being connected with each other; a valve core, installed in the valve body and capable of moving along the axial direction of the valve body to connect or disconnect the first opening and the second opening; wherein a first stop protrusion is convexly provided on the outer peripheral side of the valve body, the first stop protrusion abutting against the tube wall of the valve tube.

[0005] In this way, the first path and the second path constitute a passage for fluid flow, and the valve body is located between the first path and the second path, so the opening and closing of the valve body can control the opening and closing between the first path and the second path. The outer peripheral side of the valve body is provided with a first opening connected to the first path, and the fluid can flow into the valve body from the first path through the first opening. The side of the valve body away from the valve seat is provided with a second opening, and the fluid can flow out from the valve body in the direction away from the valve seat through the second opening. The valve core controls the connection between the first opening and the second opening by axial movement in the valve body, that is, it can control the opening and closing between the first path and the second path. The outer peripheral side of the valve body is provided with a first stopper protrusion that can abut against the tube wall of the valve tube, so when the valve core and the valve body are closed in coordination, the first stopper protrusion can withstand the pressure on the valve body by abutting against the tube wall of the valve tube, and because the first stopper protrudes from the outer peripheral side of the valve body, it can form a circumferential abutment effect with the tube wall of the valve tube, the abutment area is large, the pressure per unit area is small, it is not easy to be damaged, and the limiting effect is better.

[0006] In one embodiment, the second path includes an installation section and a flow section, the installation section and the flow section are connected, the diameter of the tube wall of the second path forming the flow section is smaller than the tube wall of the second path forming the installation section to form a step, and the first stop protrusion abuts against the step.

[0007] In one embodiment, a first sealing groove is formed on the outer peripheral side of the valve body, a first sealing ring is embedded in the first sealing groove, and the outer peripheral side of the first sealing ring abuts against the inner side of the tube wall forming the flow section.

[0008] In one embodiment, at least a portion of the valve seat extends into the passage, and a second stop protrusion is further provided on the outer peripheral side of the valve body, and a side of the second stop protrusion away from the first stop protrusion can abut against the valve seat.

[0009] In one embodiment, a guiding slope is formed on a side of the first stop protrusion facing away from the step, and the guiding slope is inclined toward the first path.

[0010] In one embodiment, the valve seat is provided with an installation cavity, the valve body is arranged in the installation cavity, and along the radial direction of the valve body, the outer wall of the valve body and the valve seat form a clearance fit with the inner wall of the installation cavity; along the axial direction of the valve body, the first stop protrusion and the tube wall of the valve tube are clearance fit; or, along the axial direction of the valve body, the valve body and the valve seat are clearance fit.

[0011] In one embodiment, at least a portion of the valve seat is disposed in the valve tube, and a second sealing groove is formed on the outer circumference of the valve seat, a second sealing ring is embedded in the second sealing groove, and the outer circumference of the second sealing ring abuts against the tube wall of the valve tube.

[0012] In one embodiment, the valve core includes a sealing portion and an abutment portion, wherein the abutment portion is connected to a side of the sealing portion facing away from the valve seat, and as the valve core moves along the axial direction of the valve body, the sealing portion can abut against the valve body and seal the second opening, and the abutment portion abuts against an inner wall of the valve body to form the second opening.

[0013] In one embodiment, the abutting portions are multiple and are evenly spaced along the circumference of the valve core.

[0014] In one embodiment, a mating portion is provided on the side of the sealing portion facing away from the abutting portion, and a mating boss is provided on the inner wall of the valve seat facing the valve core. The mating boss, the valve body and the mating portion are coaxially arranged, and the mating portion can extend into the mating boss, and the outer peripheral side of the mating portion abuts against the inner peripheral side of the mating boss.

[0015] Compared with the prior art, the one-way valve provided in the present application has a first stop protrusion protruding from the outer peripheral side of the valve body that can abut against the tube wall of the valve tube. Therefore, when the valve core and the valve body are closed in cooperation, the first stop protrusion can withstand the pressure exerted on the valve body by abutting against the tube wall of the valve tube. Moreover, since the first stop protrusion protrudes from the outer peripheral side of the valve body, it can form a circumferential abutment effect with the tube wall of the valve tube. The abutment area is large, the pressure per unit area is small, it is not easy to be damaged, and the limiting effect is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A cross-sectional view of one embodiment of the one-way valve provided by the utility model;

[0017] Figure 2 A partial structural schematic diagram of one embodiment of the one-way valve provided by the utility model;

[0018] Figure 3 A schematic structural diagram of one embodiment of the valve body provided by the utility model;

[0019] Figure 4 A schematic structural diagram of one embodiment of the valve tube provided by the utility model;

[0020] Figure 5 A schematic structural diagram of one embodiment of the valve seat provided by the utility model;

[0021] Figure 6This is a schematic structural diagram of one embodiment of the valve core provided by the utility model.

[0022] The symbols in the figure mean the following:

[0023] 100. One-way valve; 10. Valve tube; 11. Passageway; 111. First way; 112. Second way; 1121. Installation section; 1122. Flow section; 12. Step; 20. Valve seat; 21. Installation cavity; 22. Second sealing groove; 23. Second sealing ring; 24. Matching boss; 241. Matching groove; 25. Clamping groove; 30. Valve body; 31. First stop protrusion; 311. Guide slope; 32. Second stop protrusion; 33. First opening; 34. Second opening; 35. First sealing groove; 36. First sealing ring; 37. Clamping protrusion; 371. Installation slope; 40. Valve core; 41. Sealing portion; 42. Abutment portion; 43. Matching portion; 50. Elastic member. DETAILED DESCRIPTION

[0024] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0025] It should be noted that when a mechanism is referred to as being "fixed to" or "set on" another mechanism, it may be directly on the other mechanism or there may be a central mechanism. When a mechanism is considered to be "connected to" another mechanism, it may be directly connected to the other mechanism or there may be a central mechanism at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of this application are for illustrative purposes only and do not represent the only implementation method.

[0026] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0027] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first feature is directly in contact with the second feature, or the first feature and the second feature are indirectly in contact through an intermediate medium. Moreover, a first feature being “above”, “above” or “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below” or “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0028] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in the specification of this application includes any and all combinations of one or more related listed items.

[0029] In the existing one-way valve, since the valve seat and the valve body are connected by a buckle, when the one-way valve is in a closed state, the valve body will be subjected to the pressure load of the fluid, which may easily cause the buckle to break and cause the one-way valve to fail.

[0030] To this end, the present application provides a one-way valve 100, on which a first stop protrusion 31 is protruded from the valve body 30 and can abut against the valve tube 10. The first stop protrusion 31 abuts against the tube wall, thereby making the installation of the valve body 30 stable and the connection with the valve seat 20 more secure.

[0031] See also Figure 1-Figure 3The one-way valve 100 includes a valve tube 10, a valve seat 20, a valve body 30 and a valve core 40. The valve tube 10 is configured with a passage 11 for fluid flow. The passage 11 includes a first passage 111 and a second passage 112 that are connected. The valve seat 20 is connected to the valve tube 10. The valve body 30 is located between the first passage 111 and the second passage 112 and is connected to the valve seat 20. At least one first opening 33 is provided on the outer peripheral side of the valve body 30. A second opening 34 is provided on the side of the valve body 30 away from the valve seat 20. The first opening 33 is connected to the first passage 111, and the second opening 34 is connected to the second passage 112. The first opening 33 and the second opening 34 are connected to each other. The valve core 40 is installed in the valve body 30 and can move along the axial direction of the valve body 30 to connect or block the first opening 33 and the second opening 34. A first stop protrusion 31 is convexly provided on the outer peripheral side of the valve body 30, and the first stop protrusion 31 abuts against the tube wall of the valve tube 10. In this way, the first path 111 and the second path 112 constitute a passage 11 for fluid flow, and the valve body 30 is located between the first path 111 and the second path 112. Therefore, the opening and closing of the valve body 30 can control the opening and closing between the first path 111 and the second path 112. A first opening 33 connected to the first path 111 is provided on the outer peripheral side of the valve body 30, and the fluid can flow from the first path 111 into the interior of the valve body 30 through the first opening 33. A second opening 34 is provided on the side of the valve body 30 away from the valve seat 20, and the fluid can flow out from the valve body 30 toward the direction away from the valve seat 20 through the second opening 34. The valve core 40 controls the connection between the first opening 33 and the second opening 34 by axially moving in the valve body 30, that is, it can control the opening and closing between the first path 111 and the second path 112. The outer peripheral side of the valve body 30 is convexly provided with a first stop protrusion 31 which can abut against the tube wall of the valve tube 10. Therefore, when the valve core 40 and the valve body 30 are closed in cooperation, the first stop protrusion 31 can withstand the pressure exerted on the valve body 30 by abutting against the tube wall of the valve tube 10. Moreover, since the first stop protrusion 31 protrudes from the outer peripheral side of the valve body 30, it can form a circumferential abutment effect with the tube wall of the valve tube 10. The abutment area is large, the pressure per unit area is small, it is not easy to be damaged, and the limiting effect is better.

[0032] Preferably, in this embodiment, the first stop protrusion 31 surrounds the outer circumference of the valve body 30 and forms a complete abutment effect with the tube wall of the valve tube 10, which is beneficial to stress sharing and the first stop protrusion 31 has a better stopping effect.

[0033] In this embodiment, there are multiple first openings 33 , which are evenly spaced around the outer circumference of the valve body 30 , thereby increasing the flow area between the inside of the valve body 30 and the first path 111 and improving the flow efficiency of the fluid.

[0034] See also Figure 4Further, the second passage 112 includes a mounting section 1121 and a flow section 1122, the mounting section 1121 and the flow section 1122 are connected, the diameter of the tube wall of the second passage 112 forming the flow section 1122 is smaller than the tube wall of the second passage 112 forming the mounting section 1121 to form a step 12, and the first stop protrusion 31 abuts against the step 12. In this way, the step 12 is naturally formed by the change in the aperture of the tube wall forming the second passage 112, and there is no need to add an additional structure for the first stop protrusion 31 to abut. Therefore, the structure of the valve tube 10 is simple and the cost is low. Moreover, the step 12 is formed by the change in the aperture of the tube wall. When it abuts against the first stop protrusion 31, the load transmitted by the first stop protrusion 31 is just along the extension direction of the tube wall, so the abutment strength is high and it is not easy to break and deform. In addition, the diameter of the tube wall forming the mounting section 1121 is larger, so the space for accommodation is larger, which is convenient for the installation of structures such as the valve seat 20 and the valve body 30.

[0035] A guide slope 311 is formed on one side of the first stop protrusion 31 facing away from the step 12, and the guide slope 311 is inclined toward the first path 111. In this way, the fluid can be guided to flow from the first opening 33 into the valve body 30, so that the fluid flows more smoothly and turbulence is reduced.

[0036] Of course, in other embodiments, the second stop protrusion 32 may also abut against the tube wall of the valve tube 10 in other ways. For example, a mounting boss (not shown in the figure) is radially protruded inwardly on the inner wall of the valve tube 10, and the second stop protrusion 32 abuts against the mounting boss, which can also achieve the same technical effect.

[0037] See also Figure 3 A first sealing groove 35 is formed on the outer circumference of the valve body 30, a first sealing ring 36 is embedded in the first sealing groove 35, and the outer circumference of the first sealing ring 36 abuts against the inner side of the pipe wall forming the flow section 1122. In this way, the sealing effect between the valve body 30 and the pipe wall of the valve pipe 10 is improved to prevent leakage of the medium.

[0038] In other embodiments, a plurality of first sealing grooves 35 are provided, and a first sealing ring 36 is correspondingly embedded in each first sealing groove 35 , thereby further improving the sealing performance between the valve body 30 and the valve tube 10 .

[0039] Furthermore, at least a portion of the valve seat 20 extends into the passage 11, and a second stop protrusion 32 is convexly provided on the outer peripheral side of the valve body 30, and the side of the second stop protrusion 32 away from the first stop protrusion 31 can abut against the valve seat 20. In this way, since the second stop protrusion 32 abuts against the valve seat 20, the second stop protrusion 32 can stop the movement of the valve body 30 toward the valve seat 20, ensuring the stability of the installation position of the valve body 30, and can also prevent the valve body 30 from moving toward the valve seat 20, causing the first sealing groove 35 to be exposed in the valve pipe 10, causing the first sealing ring 36 to fall out.

[0040] See also Figure 5 The valve seat 20 is provided with a mounting cavity 21, and the valve body 30 is disposed in the mounting cavity 21, and along the radial direction of the valve body 30, the outer wall of the valve body 30 and the inner wall of the mounting cavity 21 formed by the valve seat 20 are gap-matched, and along the axial direction of the valve body 30, the first stop protrusion 31 and the pipe wall of the valve pipe 10 are gap-matched, or, along the axial direction of the valve body 30, the valve body 30 and the valve seat 20 are gap-matched, specifically, the second stop protrusion 32 and the valve seat 20 are gap-matched. In this way, the valve body 30 can move slightly in the axial direction, thereby realizing the function of axial position compensation.

[0041] Of course, in other embodiments, the first stop protrusion 31 can be configured to completely abut against the valve tube 10, and the second stop protrusion 32 can also be configured to completely abut against the valve seat 20, so that the installation of the valve seat 20 is more stable and reliable.

[0042] At least part of the valve seat 20 is disposed in the valve tube 10, and a second sealing groove 22 is formed on the outer circumference of the valve seat 20, a second sealing ring 23 is embedded in the second sealing groove 22, and the outer circumference of the second sealing ring 23 abuts against the wall of the valve tube 10. In this way, the sealing performance between the valve seat 20 and the valve tube 10 can be improved, and the fluid can be prevented from leaking from the gap between the valve seat 20 and the valve tube 10.

[0043] It is understandable that the second sealing groove 22 can also be provided in plurality, in a manner similar to that of the first sealing groove 35 , which will not be described in detail herein.

[0044] See also Figure 6 The valve core 40 includes a blocking portion 41 and an abutting portion 42. The abutting portion 42 is connected to the side of the blocking portion 41 facing away from the valve seat 20. As the valve core 40 moves along the axial direction of the valve body 30, the blocking portion 41 can abut against the valve body 30 and block the second opening 34. The abutting portion 42 abuts against the inner wall of the second opening 34 formed by the valve body 30. In this way, the blocking portion 41 is used to realize the opening and closing of the second opening 34. The abutting portion 42 is connected to the blocking portion 41, so it will move synchronously with the movement of the blocking portion 41. Since the abutting portion 42 abuts against the inner wall of the second opening 34 formed by the valve body 30, the second opening 34 can guide and limit the abutting portion 42. The moving path of the abutting portion 42 will extend along the extension direction of the inner wall of the second opening 34, thereby guiding the movement process of the entire valve core 40, so that the movement of the valve core 40 is more stable.

[0045] Specifically, in this embodiment, the blocking portion 41 is an arc surface structure, which protrudes toward the second opening 34. When the fluid flows reversely from the second opening 34 and the valve core 40 is in a closed state, the arc surface structure of the blocking portion 41 can bear a larger fluid pressure load.

[0046] Specifically, there are multiple abutment portions 42 that are evenly spaced along the circumference of the valve core 40 , so that the multiple abutment portions 42 can abut against the inner wall of the second opening 34 formed by the valve body 30 , thereby further improving the ability of the valve body 30 to guide the movement of the valve core 40 .

[0047] A matching portion 43 is provided on the side of the blocking portion 41 facing away from the abutting portion 42, and a matching boss 24 is provided on the inner wall of the valve seat 20 facing the valve core 40. The matching boss 24, the valve body 30 and the matching portion 43 are coaxially arranged, and the matching portion 43 can extend into the matching boss 24, and the outer peripheral side of the matching portion 43 abuts against the inner peripheral side of the matching boss 24. In this way, since the matching boss 24 and the valve body 30 are coaxially arranged, the axis of the matching boss 24 is coaxial with the moving path of the valve core 40, and the matching portion 43 is also coaxial with the matching boss 24, so the abutment between the matching portion 43 and the matching boss 24 can also guide the moving path of the valve core 40, thereby preventing the valve core 40 from being offset during the process of switching the valve, thereby causing fluid leakage.

[0048] Specifically, in this embodiment, the matching portion 43 is configured as a quadrangular prism structure, a matching groove 241 is provided in the matching protrusion, and the matching portion 43 extends into the matching groove 241 and abuts against the groove wall of the matching groove 241. The quadrangular prism structure reduces the contact area on the basis of forming multiple abutment points in the circumferential direction, thereby reducing the friction force during the movement of the valve core 40 relative to the valve seat 20.

[0049] In other embodiments, the matching portion 43 may also be configured as a triangular prism, a pentagonal prism structure, a hexagonal prism structure, etc., and is not limited to the above-mentioned quadrangular prism structure.

[0050] At least two clamping protrusions 37 are also convexly provided on the outer peripheral side of the valve body 30, and at least two clamping grooves 25 are provided on the valve seat 20. The clamping protrusions 37 are correspondingly clamped in the clamping grooves 25 to strengthen the assembly between the valve body 30 and the valve seat 20. The clamping protrusions 37 are provided with mounting inclined surfaces 371 inclined toward the axis of the valve body 30, and the mounting inclined surfaces 371 can facilitate the clamping protrusions 37 to enter the clamping grooves 25.

[0051] In other embodiments, the number of the clamping protrusions 37 may also be three, four, etc., and the number of the clamping grooves 25 on the valve seat 20 may also increase accordingly with the number of the clamping protrusions 37 .

[0052] An elastic member 50 is disposed between the valve core 40 and the valve seat 20, one end of the elastic member 50 abuts against the valve core 40, and the other end abuts against the valve seat 20, so as to always exert a moving force on the valve core 40 to move away from the valve seat 20. When the valve core 40 is in an open state, the elastic member 50 is compressed, and when the fluid stops flowing into the valve body 30 from the second opening 34, the elastic member 50 can drive the valve core 40 to move away from the valve seat 20 to block the second opening 34, thereby realizing the resetting of the valve core 40.

[0053] In this embodiment, the elastic member 50 is a spring.

[0054] Compared with the prior art, the one-way valve 100 provided in the present application is provided with a first stop protrusion 31 on the outer peripheral side of the valve body 30 that can abut against the tube wall of the valve tube 10. Therefore, when the valve core 40 and the valve body 30 are closed in coordination, the first stop protrusion 31 can withstand the pressure exerted on the valve body 30 by abutting against the tube wall of the valve tube 10. Moreover, since the first stop protrusion 31 protrudes from the outer peripheral side of the valve body 30, it can form a circumferential abutment effect with the tube wall of the valve tube 10, and the abutment area is large, the pressure per unit area is small, it is not easy to be damaged, and the limiting effect is better.

[0055] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0056] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A one-way valve, characterized in that: The one-way valve comprises: A valve tube (10), wherein the valve tube (10) is configured with a passage (11) for fluid flow, wherein the passage (11) comprises a first passage (111) and a second passage (112) that are connected to each other; a valve seat (20), wherein the valve seat (20) is connected to the valve pipe (10); a valve body (30), the valve body (30) being located between the first path (111) and the second path (112) and connected to the valve seat (20), the outer peripheral side of the valve body (30) being provided with at least one first opening (33), the side of the valve body (30) away from the valve seat (20) being provided with a second opening (34), the first opening (33) being in communication with the first path (111), the second opening (34) being in communication with the second path (112), and the first opening (33) and the second opening (34) being in communication with each other; A valve core (40) is installed in the valve body (30) and is movable along the axial direction of the valve body (30) to connect or disconnect the first opening (33) and the second opening (34); Wherein, a first stop protrusion (31) is convexly provided on the outer peripheral side of the valve body (30), and the first stop protrusion (31) abuts against the tube wall of the valve tube (10).

2. The one-way valve according to claim 1, characterized in that: The second path (112) comprises a mounting section (1121) and a flow section (1122); the mounting section (1121) and the flow section (1122) are connected; the diameter of the tube wall of the flow section (1122) formed by the second path (112) is smaller than the diameter of the tube wall of the mounting section (1121) formed by the second path (112) to form a step (12); the first stop protrusion (31) abuts against the step (12).

3. The one-way valve according to claim 2, characterized in that: A first sealing groove (35) is provided on the outer peripheral side of the valve body (30), a first sealing ring (36) is embedded in the first sealing groove (35), and the outer peripheral side of the first sealing ring (36) abuts against the inner side of the tube wall forming the flow section (1122).

4. The one-way valve according to claim 3, characterized in that: At least a portion of the valve seat (20) extends into the passage (11), and a second stop protrusion (32) is also protruded from the outer peripheral side of the valve body (30), and the side of the second stop protrusion (32) away from the first stop protrusion (31) can abut against the valve seat (20).

5. The one-way valve according to claim 2, characterized in that: A guide slope (311) is provided on a side of the first stop protrusion (31) facing away from the step (12), and the guide slope (311) is inclined toward the first path (111).

6. The one-way valve according to claim 1, characterized in that: The valve seat (20) is provided with a mounting cavity (21), the valve body (30) is arranged in the mounting cavity (21), and along the radial direction of the valve body (30), the outer wall of the valve body (30) and the valve seat (20) form a clearance fit with the inner wall of the mounting cavity (21); Along the axial direction of the valve body (30), the first stop protrusion (31) is clearance-matched with the tube wall of the valve tube (10); or, Along the axial direction of the valve body (30), the valve body (30) and the valve seat (20) are clearance-matched.

7. The one-way valve according to claim 1, characterized in that: At least a portion of the valve seat (20) is disposed in the valve tube (10), and a second sealing groove (22) is provided on the outer peripheral side of the valve seat (20), a second sealing ring (23) is embedded in the second sealing groove (22), and the outer peripheral side of the second sealing ring (23) abuts against the tube wall of the valve tube (10).

8. The one-way valve according to claim 1, characterized in that: The valve core (40) includes a sealing portion (41) and an abutting portion (42), wherein the abutting portion (42) is connected to a side of the sealing portion (41) facing away from the valve seat (20), and as the valve core (40) moves axially along the valve body (30), the sealing portion (41) can abut against the valve body (30) and seal the second opening (34), and the abutting portion (42) abuts against the inner wall of the valve body (30) to form the second opening (34).

9. The one-way valve according to claim 8, characterized in that: There are a plurality of abutment portions (42), which are evenly spaced along the circumference of the valve core (40).

10. The one-way valve according to claim 8, characterized in that: The sealing portion (41) is provided with a mating portion (43) on the side facing away from the abutting portion (42), and the valve seat (20) is provided with a mating boss (24) protruding toward the inner wall of the valve core (40), and the mating boss (24), the valve body (30) and the mating portion (43) are coaxially arranged, and the mating portion (43) can extend into the mating boss (24), and the outer peripheral side of the mating portion (43) abuts against the inner peripheral side of the mating boss (24).

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