Check valve

Abstract

The utility model relates to the technical field of check valves, and discloses a check valve which comprises a valve body, a valve element, a valve rod and a guide assembly. The valve body is provided with a fluid inlet; the valve element and the valve rod are arranged in the valve body, the valve element is arranged at the end of the valve rod, and the valve rod drives the valve element to block or open the fluid inlet. The guide assembly is arranged in the valve body and comprises at least two bearing positions arranged at intervals, and when the valve body is horizontally placed in the first direction, the valve rod slides in the first direction and makes contact with the bearing positions. The check valve is provided with the guide assembly, the two bearing positions are arranged at intervals through the guide assembly, the valve rod can be borne when the valve body is arranged in the first direction (such as the horizontal direction), the torque applied to the valve rod by the valve element is changed, and then the problem that the valve element deviates from the sealing position due to inclination of the valve rod is avoided; the valve rod can slide in the first direction all the time without side inclination, the valve element can be located at the correct sealing position, and then the plugging effect on the fluid inlet is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of check valves, in particular to a check valve. Background Art

[0002] A check valve is a valve that controls the unidirectional flow of media within a pipeline. It is used to prevent backflow, reverse rotation of pumps and their drive motors, and the release of media from containers. A check valve automatically opens and closes using the force generated by the flow of the media within the pipeline, making it an automatic valve. Check valves are only used in pipelines with unidirectional flow to prevent backflow and accidents. They are primarily used in pipelines for food, beverages, dairy products, beer, petroleum, chemicals, pharmaceuticals, and electricity.

[0003] Combine Figure 1 Existing check valves primarily consist of a valve body, a valve core, a valve stem, and a retaining ring. The valve stem is used to drive the valve core to block or open the fluid inlet of the valve body. The valve core is mounted on one end of the valve stem, and the other end slides through the mounting hole of the retaining ring. To ensure smooth movement between the valve stem and the mounting hole, a large gap is required. When the check valve is placed horizontally, the heavy valve core causes the end of the valve stem where the valve core is mounted to tilt downward. Consequently, the end of the valve stem where the valve core is mounted to the mounting hole tilts upward, causing the valve core to deviate from its sealing position. This prevents the valve core from fully sealing the interface with the valve body, leading to leakage. Utility Model Content

[0004] In view of this, the utility model provides a check valve to solve the problem that the valve stem of the existing check valve is prone to tilting downward at one end of the valve stem where the valve core is set due to the heavy valve core, causing the valve core to deviate from the sealing position, making it impossible for the valve core to completely seal the interface of the valve body, thereby causing leakage.

[0005] In a first aspect, the present invention provides a check valve, wherein the valve body is provided with a fluid inlet;

[0006] A valve core and a valve stem are disposed in the valve body, the valve core is disposed at the end of the valve stem, and the valve stem drives the valve core to block or open the fluid inlet;

[0007] The guide assembly is arranged in the valve body, and the guide assembly includes at least two support positions arranged at intervals. When the valve body is placed horizontally along a first direction, the valve stem slides along the first direction and contacts the support positions.

[0008] Beneficial effects: The check valve is provided with a guide assembly, and the two support positions arranged at intervals by the guide assembly can support the valve stem when the valve body is set along a first direction (such as a horizontal direction), thereby changing the torque applied by the valve core to the valve stem, thereby avoiding the problem of the valve core deviating from the sealing position due to the inclination of the valve stem, so that the valve stem can always keep sliding along the first direction without tilting, so that the valve core can be in the correct sealing position, thereby ensuring the sealing effect of the fluid inlet.

[0009] In an optional embodiment, the guide assembly includes a first guide hole, the valve stem is slidably inserted into the first guide hole, and the inner wall of the first guide hole constitutes a supporting position.

[0010] Beneficial effects: The first guide hole can guide and support the valve stem, and the guide hole is simple to process, with low manufacturing difficulty, and the guiding and supporting functions are stable. The upper side of the inner wall of the first guide hole can also limit the valve stem, and cooperate with the first supporting position to better guide the valve stem.

[0011] In an optional embodiment, the guide assembly further includes a second guide hole, which is coaxially arranged with the first guide hole, and the second guide hole and the first guide hole are spaced apart from each other, the valve stem is slidably passed through the second guide hole, and the inner wall of the second guide hole constitutes another supporting position.

[0012] Beneficial effects: The second guide hole has a simple structure, low manufacturing difficulty and is easy to set up. The second supporting position formed by the second guide hole cooperates with the first supporting position formed by the first guide hole, which can effectively support the valve stem as a whole, reduce the torque of the valve core on the valve stem, make the valve stem position more stable and able to maintain a horizontal state, avoid the valve stem setting one end of the valve core tilting downward, and thus enable the valve core to be in the correct sealing position to ensure the blocking of the fluid inlet.

[0013] In an optional embodiment, the first guide hole is in sliding engagement with an end of the valve stem away from the valve core, and the second guide hole is in sliding engagement with a middle portion of the valve stem.

[0014] Beneficial effect: This setting maintains a larger distance between the first guide hole and the second guide hole without affecting the movement of the valve core driven by the valve stem. The larger distance between the first guide hole and the second guide hole can further reduce the torque of the valve core acting on the valve stem, ensuring the horizontal setting of the valve stem, and further ensuring that the valve core blocks the fluid inlet.

[0015] In an optional embodiment, the guide assembly includes a first fixing frame and a second fixing frame, both of which are connected to the inner wall of the valve body, the first guide hole is provided in the first fixing frame, and the second guide hole is provided in the second fixing frame.

[0016] Beneficial effects: The first guide hole and the second guide hole can be simply and effectively set respectively through the first fixing bracket and the second fixing bracket, while ensuring the stability of the first supporting position and the second supporting position, so that the first supporting position and the second supporting position can stably support the valve stem, ensuring that the valve stem can remain horizontal during the movement, thereby ensuring that the valve core can be in the correct sealing position to seal the fluid inlet.

[0017] In an optional embodiment, the outer peripheral edges of the first fixing bracket and the second fixing bracket are both connected to the inner wall of the valve body, and the outer peripheral edges of the first fixing bracket and the second fixing bracket are arranged in close contact along the axial direction of the valve body.

[0018] Beneficial effects: A certain sealing effect can be generated between the first fixing frame and the second fixing frame, thereby reducing the infiltration of fluid into the connection between the first fixing frame and the second fixing frame and the inner wall of the valve body, and reducing cleaning dead corners.

[0019] In an optional embodiment, a first sealing member is provided at the fitting position of the outer peripheral edge of the first fixing frame and the outer peripheral edge of the second fixing frame.

[0020] Beneficial effect: The first sealing member can prevent the fluid from flowing through the space between the first fixing frame and the second fixing frame into the connection between the first fixing frame and the valve body, thereby reducing cleaning dead corners.

[0021] In an optional embodiment, a second sealing member is provided between the valve body and a side of an outer peripheral edge of the first fixing frame away from the second fixing frame.

[0022] Beneficial effect: The second sealing member can prevent the fluid from flowing from between the first fixing frame and the valve body into the connection between the first fixing frame and the valve body, thereby reducing cleaning dead angles.

[0023] In an optional embodiment, a third sealing member is provided at the abutment position between the outer wall of the second fixing bracket and the inner wall of the valve body.

[0024] Beneficial effect: The third sealing member can prevent the fluid from flowing from between the second fixing frame and the valve body into the connection between the first fixing frame and the valve body, thereby reducing cleaning dead corners.

[0025] In an optional embodiment, the guide assembly further includes a bushing, which is arranged on the inner walls of the first guide hole and the second guide hole.

[0026] Beneficial effects: The bushing can reduce the friction between the inner wall of the first guide hole, the inner wall of the second guide hole and the valve stem, thereby extending the service life of the valve stem. It can also reduce the noise and vibration generated by the inner wall of the first guide hole and the inner wall of the second guide hole when the valve stem moves. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 It is a check valve in the prior art;

[0029] Figure 2 This is a cross-sectional view of a check valve according to an embodiment of the present utility model;

[0030] Figure 3 for Figure 2 Enlarged view of point A in the middle.

[0031] Description of reference numerals:

[0032] 1. Valve body; 11. Fluid inlet; 12. Fluid outlet; 13. Mounting platform;

[0033] 2. Valve core;

[0034] 3. Valve stem; 31. Second limiter;

[0035] 4. Guide assembly; 41. First fixing bracket; 411. First guide hole; 412. First circulation hole; 42. Second fixing bracket; 421. Second guide hole; 422. Boss; 423. Second circulation hole; 43. First limiting boss; 44. Bushing;

[0036] 5. First seal;

[0037] 6. Second sealing member;

[0038] 7. The third seal;

[0039] 8. Elastic parts. DETAILED DESCRIPTION

[0040] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0041] The following combination Figures 2 to 3 , describing an embodiment of the check valve of the present utility model.

[0042] According to an embodiment of the present invention, in one aspect, a check valve is provided, comprising a valve body 1, a valve core 2, a valve stem 3, and a guide assembly 4. The valve body 1 is provided with a fluid inlet 11; the valve core 2 and the valve stem 3 are disposed within the valve body 1, with the valve core 2 disposed at the end of the valve stem 3, and the valve stem 3 drives the valve core 2 to block or open the fluid inlet 11; the guide assembly 4 is disposed within the valve body 1, and includes at least two spaced-apart support positions. When the valve body 1 is positioned in a first direction, the valve stem 3 slides in the first direction and contacts the support positions.

[0043] The check valve provided in this embodiment is provided with a guide assembly 4. Through the two support positions arranged at intervals by the guide assembly 4, the valve stem 3 can be supported when the valve body 1 is set along a first direction (such as a horizontal direction), thereby changing the torque applied by the valve core 2 to the valve stem 3, thereby avoiding the problem of the valve core 2 deviating from the sealing position due to the inclination of the valve stem 3, so that the valve stem 3 can always keep sliding along the first direction during the movement and will not tilt sideways, so that the valve core 2 can be in the correct sealing position, thereby ensuring the sealing effect of the fluid inlet 11.

[0044] The valve body 1 is provided with a fluid inlet 11 , and fluid (such as liquid) is suitable for entering the valve body 1 from the fluid inlet 11 . The check valve is also provided with a fluid outlet 12 , and the fluid entering the valve body 1 is suitable for flowing out of the valve body 1 from the fluid outlet 12 .

[0045] The valve core 2 is arranged at the end of the valve stem 3, and the valve stem 3 reciprocates in the valve body 1. The valve stem 3 can drive the valve core 2 to move toward the direction close to the fluid inlet 11, thereby blocking the fluid inlet 11. The valve stem 3 can also drive the valve core 2 to move away from the fluid inlet 11, thereby opening the fluid inlet 11.

[0046] The guide assembly 4 can guide and support the valve stem 3. When the valve body 1 is placed along the first direction, the valve stem 3 slides along the first direction and contacts the supporting position. The first direction refers to a direction with a horizontal component or a horizontal direction. In this embodiment, the first direction is specifically a horizontal direction, such as Figure 2 Indicated by the arrow.

[0047] When the valve body 1 is set horizontally, the valve stem 3 is supported by the guide assembly 4, and the valve stem 3 slides horizontally at two supporting positions. When the valve stem 3 slides in the direction away from the fluid inlet 11, it will drive the valve core 2 to move in the direction away from the fluid inlet 11. At this time, the fluid inlet 11 is open, and the fluid enters the valve body 1 from the fluid inlet 11 and flows out from the fluid outlet 12; when the valve stem 3 slides in the direction close to the fluid inlet 11, it will drive the valve core 2 to move in the direction close to the fluid inlet 11. When the valve core 2 abuts against the fluid inlet 11, the valve core 2 will block the fluid inlet 11, thereby preventing the fluid from entering the valve body 1 from the fluid inlet 11, or preventing the fluid from entering from the fluid outlet 12 and flowing out of the valve body 1 through the fluid inlet 11.

[0048] Furthermore, the guide assembly 4 includes a first guide hole 411, through which the valve stem 3 is slidably disposed. The inner wall of the first guide hole 411 forms a support position. The first guide hole 411 can guide and support the valve stem 3. The guide hole is simple to manufacture, with low manufacturing difficulty, and provides stable guiding and supporting functions. When the valve stem 3 is positioned along the first direction, the lower inner wall of the first guide hole 411 serves as a support position. The upper inner wall of the first guide hole 411 can also limit the valve stem 3, cooperating with the first support position and cooperating with each other to better guide the valve stem 3.

[0049] It is understood that the axis of the first guide hole 411 should be parallel to the first direction. In this embodiment, the axis of the first guide hole 411 is arranged in the horizontal direction. The inner diameter of the first guide hole 411 should be suitable for accommodating the valve stem 3, and a certain gap should be provided between the inner wall of the first guide hole 411 and the outer wall of the valve stem 3 to ensure smooth sliding.

[0050] Furthermore, the guide assembly 4 also includes a second guide hole 421, which is coaxially arranged with the first guide hole 411 and spaced apart from each other. The valve stem 3 is slidably inserted into the second guide hole 421, and the inner wall of the second guide hole 421 constitutes another supporting position. The second guide hole 421 has a simple structure, low manufacturing difficulty, and is easy to set up. The second supporting position formed by the second guide hole 421 cooperates with the first supporting position formed by the first guide hole 411 to effectively support the valve stem 3 as a whole, reduce the torque of the valve core 2 on the valve stem 3, make the position of the valve stem 3 more stable, and maintain a horizontal state, thereby preventing the valve stem 3 from tilting downward at one end of the valve core 2, thereby enabling the valve core 2 to be in the correct sealing position, ensuring the blockage of the fluid inlet 11.

[0051] It is understood that the axis of the second guide hole 421 should be parallel to the first direction. In this embodiment, the axis of the second guide hole 421 is arranged in the horizontal direction. The inner diameter of the second guide hole 421 should be suitable for accommodating the valve stem 3, and a certain gap should be provided between the inner wall of the second guide hole 421 and the outer wall of the valve stem 3 to ensure smooth sliding.

[0052] Furthermore, the first guide hole 411 is in sliding engagement with the end of the valve stem 3 away from the valve core 2, while the second guide hole 421 is in sliding engagement with the middle portion of the valve stem 3. This arrangement maintains a relatively large spacing between the first guide hole 411 and the second guide hole 421, fully utilizing the internal space of the valve body 1 without affecting the movement of the valve core 2 driven by the valve stem 3. The relatively large spacing between the first guide hole 411 and the second guide hole 421 further reduces the torque exerted by the valve core 2 on the valve stem 3, ensuring a horizontal arrangement of the valve stem 3 and, consequently, ensuring that the valve core 2 blocks the fluid inlet 11.

[0053] Specifically, the guide assembly 4 includes a first fixing bracket 41 and a second fixing bracket 42, both of which are connected to the inner wall of the valve body 1. A first guide hole 411 is provided in the first fixing bracket 41, and a second guide hole 421 is provided in the second fixing bracket 42. The first fixing bracket 41 and the second fixing bracket 42 allow for simple and effective positioning of the first guide hole 411 and the second guide hole 421, respectively, while ensuring the stability of the first and second supporting positions. These positions enable the first and second supporting positions to stably support the valve stem 3, ensuring that the valve stem 3 remains horizontal during movement, thereby ensuring that the valve core 2 is in the correct sealing position to block the fluid inlet 11.

[0054] Furthermore, the guide assembly 4 includes a bushing 44, which is disposed on the inner walls of the first guide hole 411 and the second guide hole 421. The bushing 44 can reduce friction between the inner walls of the first guide hole 411, the inner walls of the second guide hole 421, and the valve stem 3, thereby extending the service life of the valve stem 3. It can also reduce noise and vibration generated by the inner walls of the first guide hole 411 and the inner walls of the second guide hole 421 when the valve stem 3 moves.

[0055] In this embodiment, bushing 44 is made of polytetrafluoroethylene, which is wear-resistant, corrosion-resistant, and self-lubricating. This further reduces friction between the inner walls of first guide hole 411, inner walls of second guide hole 421, and valve stem 3. Furthermore, food-grade polytetrafluoroethylene can be used, enabling the check valve to be used in pipelines in industries such as food and beverages. In other embodiments, bushing 44 can also be made of graphite.

[0056] Specifically, the inner walls of the first guide hole 411 and the second guide hole 421 near the fluid inlet 11 protrude into the first guide hole 411 to form a first limiting boss 43. The first limiting boss 43 abuts against the bushing 44 at one end near the bushing 44, thereby strengthening the connection strength of the bushing 44 and preventing the bushing 44 from loosening.

[0057] Specifically, the outer edges of the first and second fixing frames 41, 42 are both connected to the inner wall of the valve body 1, and the outer edges of the first and second fixing frames 41, 42 are arranged in close contact along the axial direction of the valve body 1. This creates a certain sealing effect between the first and second fixing frames 41, 42, reducing fluid infiltration into the connection between the first and second fixing frames 41, 42 and the inner wall of the valve body 1, and eliminating blind spots for cleaning.

[0058] Specifically, a first thread is provided on the outer circumference of the first fixing bracket 41, and a second thread is provided on the inner wall of the valve body 1, with the first thread matching the second thread. The first and second threads connect the first fixing brackets 41 to each other, making the connection simple, convenient, and secure, and facilitating maintenance or replacement of the first fixing brackets 41.

[0059] Furthermore, a first seal 5 is provided at the contact position between the outer periphery of the first fixing frame 41 and the outer periphery of the second fixing frame 42. The first seal 5 can prevent fluid from flowing between the first fixing frame 41 and the second fixing frame 42 into the first thread and the second thread.

[0060] Specifically, a first mounting groove is provided at the joint between the outer edges of the first fixing frame 41 and the outer edges of the second fixing frame 42, and the first sealing member 5 is disposed within the first mounting groove. This ensures a secure installation of the first sealing member 5 and ensures the sealing effect of the first sealing member 5. In this embodiment, the first mounting groove is formed in the second fixing frame 42; in other embodiments, the first mounting groove may also be formed in the first fixing frame 41.

[0061] Furthermore, a second seal 6 is disposed between the outer edge of the first fixing bracket 41, facing away from the second fixing bracket 42, and the valve body 1. The second seal 6 prevents fluid from flowing between the first fixing bracket 41 and the valve body 1 into the first and second threads. In this embodiment, the second mounting groove is formed in the first fixing bracket 41. In other embodiments, the second mounting groove can also be formed in the inner wall of the valve body 1.

[0062] Specifically, a second mounting groove is provided between the side of the outer peripheral edge of the first fixing frame 41 away from the second fixing frame 42 and the valve body 1, and the second sealing member 6 is provided in the second mounting groove, so that the second sealing member 6 is firmly installed, ensuring the sealing effect of the second sealing member 6.

[0063] Furthermore, a third sealing member 7 is provided at the contact position between the outer wall of the second fixing bracket 42 and the inner wall of the valve body 1. The third sealing member 7 can prevent the fluid from flowing from between the second fixing bracket 42 and the valve body 1 into the first thread and the second thread.

[0064] Specifically, a third mounting groove is provided at the abutment position between the outer wall of the second fixing bracket 42 and the inner wall of the valve body 1. The third sealing member 7 is disposed within the third mounting groove, ensuring a secure installation of the third sealing member 7 and a sealing effect of the third sealing member 7. In this embodiment, the third mounting groove is formed on the inner wall of the valve body 1. In other embodiments, the third mounting groove may also be formed on the second fixing bracket 42.

[0065] The first seal 5, the second seal 6 and the third seal 7 can effectively seal the first thread and the second thread to prevent the fluid from flowing into the first thread and the second thread, ensure the cleanliness of the first thread and the second thread, avoid cleaning dead corners, and reduce the difficulty of cleaning.

[0066] Specifically, the inner side wall of the valve body 1 protrudes toward the first fixing frame 41 to form a mounting platform 13, and the second fixing frame 42 protrudes outward near the outer peripheral side of the first fixing frame 41 to form a connecting boss 422. The connecting boss 422 is mounted on the mounting platform 13, and cooperates with the threaded cooperation between the first fixing frame 41 and the valve body 1, so that the connecting boss 422 is clamped between the first fixing frame 41 and the mounting platform 13, ensuring that the second fixing frame 42 is installed firmly, and at the same time making the disassembly and installation of the second fixing frame 42 more convenient, reducing the difficulty of inspection and replacement of the second fixing frame 42.

[0067] Specifically, the first fixing frame 41 is provided with a plurality of first flow holes 412, and the second fixing frame 42 is provided with a plurality of second flow holes 423. The first flow holes 412 pass through both sides of the first fixing frame 41, and the second flow holes 423 pass through both sides of the second fixing frame 42. The first flow holes 412 and the second flow holes 423 are used for fluid to circulate in the valve body 1.

[0068] Furthermore, the second fixing frame 42 is in the shape of a flow cage, thereby improving the flow efficiency of the fluid.

[0069] Furthermore, a fourth sealing member is provided between the outer peripheral side of the valve core 2 and the valve body 1 . The fourth sealing member can effectively seal the fluid inlet 11 to prevent the fluid from leaking into the valve body 1 .

[0070] Furthermore, the check valve also includes an elastic member 8, and the peripheral side surface of the valve stem 3 near the valve core 2 protrudes outward to form a second limit platform 31. One end of the elastic member 8 abuts the first limit boss 43 at the first guide hole 411, and the other end of the elastic member 8 abuts the second limit platform 31. When the valve stem 3 receives the thrust of the fluid and moves to a position away from the fluid inlet 11, the elastic member 8 will be compressed, so that the elastic member 8 has elastic potential energy to push the valve stem 3 toward the fluid inlet 11. When the thrust of the fluid on the valve core 2 and the valve stem 3 is less than the elastic force of the elastic member 8, the elastic member 8 will push the valve stem 3 to drive the valve core 2 to move toward the position of the fluid inlet 11, so that the valve core 2 blocks the fluid inlet 11, thereby realizing that the valve core 2 automatically switches the blocked and open states of the fluid inlet 11 according to the state of the fluid.

[0071] The basic working principle of the check valve provided in this embodiment is as follows:

[0072] The fluid inlet 11 and fluid outlet 12 of the check valve are respectively connected to fluid pipelines. Under normal circumstances, the fluid reaches the fluid inlet 11 through the fluid pipeline. As the force exerted by the fluid continues to increase, the fluid will push the valve core 2 and the valve stem 3 to move in the direction away from the fluid inlet 11, so that the valve core 2 opens the fluid inlet 11, and the fluid will enter the valve body 1 through the fluid inlet 11 and be discharged through the fluid outlet 12; in the process of the valve core 2 opening the fluid inlet 11, the elastic member 8 will be compressed; when the flow rate and / or flow rate of the fluid decreases to less than the elastic force of the elastic member 8, the elastic member 8 will push the valve stem 3 and the valve core 2 to move toward the fluid inlet 11 to block the fluid inlet 11. In the above process, the two supporting positions will effectively support the valve stem 3, preventing the valve stem 3 from tilting toward the side of the valve core 2 when the valve core 2 is close to the fluid inlet 11, so that the valve core 2 is in the correct sealing position, ensuring the sealing effect of the valve core 2 on the fluid inlet 11, preventing the fluid from entering the valve body 1 from the fluid inlet 11, and at the same time preventing the fluid from entering the valve body 1 through the fluid outlet 12 and being discharged through the fluid inlet 11, thereby avoiding the fluid diversion phenomenon.

[0073] In other embodiments, the guide assembly 4 also includes a support frame, which includes a connecting rod and a support plate. One end of the connecting rod is connected to the inner wall of the valve body 1, and the other end of the connecting rod is connected to the support plate. The length direction of the connecting rod is perpendicular to the first direction. The side of the support plate facing the valve stem 3 is arc-shaped. The inner wall of the first guide hole 411 constitutes another supporting position, and the side wall of the concave side of the support plate forms another supporting position. The two supporting positions jointly support the valve stem 3, which is simple to manufacture, reduces manufacturing costs, has less obstruction to the fluid, and can ensure the smooth flow of the fluid.

[0074] In other embodiments, according to the size of the valve body 1 and the length of the valve stem 3, the guide assembly 4 can also be provided with three, four or more supporting positions, and the supporting positions are arranged at intervals along the first direction to better support the valve stem 3, so that the valve stem 3 can drive the valve core 2 along the first direction to seal the fluid inlet 11 and ensure the sealing effect.

[0075] Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations shall fall within the scope defined by the appended claims.

Claims

1. A check valve, characterized in that: include: A valve body (1) is provided with a fluid inlet (11); A valve core (2) and a valve stem (3) are arranged in the valve body (1), the valve core (2) is arranged at the end of the valve stem (3), and the valve stem (3) drives the valve core (2) to block or open the fluid inlet (11); A guide assembly (4) is arranged in the valve body (1), and the guide assembly (4) includes at least two support positions arranged at intervals. When the valve body (1) is placed along a first direction, the valve stem (3) slides along the first direction and contacts the support positions.

2. The check valve according to claim 1, characterized in that The guide assembly (4) comprises a first guide hole (411), the valve stem (3) is slidably inserted into the first guide hole (411), and the inner wall of the first guide hole (411) forms a supporting position.

3. The check valve according to claim 2, characterized in that: The guide assembly (4) further includes a second guide hole (421), the second guide hole (421) being coaxially arranged with the first guide hole (411), and the second guide hole (421) and the first guide hole (411) being spaced apart from each other, the valve stem (3) being slidably inserted into the second guide hole (421), and the inner wall of the second guide hole (421) constituting another supporting position.

4. The check valve according to claim 3, characterized in that The first guide hole (411) is in sliding engagement with an end of the valve stem (3) away from the valve core (2), and the second guide hole (421) is in sliding engagement with the middle portion of the valve stem (3).

5. The check valve according to claim 3, characterized in that The guide assembly (4) comprises a first fixing frame (41) and a second fixing frame (42), wherein the first fixing frame (41) and the second fixing frame (42) are both connected to the inner wall of the valve body (1), the first guide hole (411) is provided in the first fixing frame (41), and the second guide hole (421) is provided in the second fixing frame (42).

6. The check valve according to claim 5, characterized in that The outer peripheral edges of the first fixing frame (41) and the second fixing frame (42) are both connected to the inner wall of the valve body (1), and the outer peripheral edges of the first fixing frame (41) and the outer peripheral edges of the second fixing frame (42) are arranged in close contact along the axial direction of the valve body (1).

7. The check valve according to claim 6, characterized in that A first sealing member (5) is provided at the fitting position of the outer peripheral edge of the first fixing frame (41) and the outer peripheral edge of the second fixing frame (42).

8. The check valve according to claim 6, characterized in that A second sealing member (6) is provided between the valve body (1) and a side of the outer peripheral edge of the first fixing frame (41) away from the second fixing frame (42).

9. The check valve according to claim 5, characterized in that A third sealing member (7) is provided at the abutting position between the outer wall of the second fixing frame (42) and the inner wall of the valve body (1).

10. The check valve according to any one of claims 3 to 9, characterized in that: The guide assembly (4) further includes a bushing (44), and the bushing (44) is arranged on the inner walls of the first guide hole (411) and the second guide hole (421).

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