Axial-flow type check valve

Abstract

The utility model relates to the technical field of axial-flow check valves, in particular to an axial-flow check valve which comprises a valve body, a valve cover, a valve seat, a valve core and an elastic component, the valve body is provided with a water outlet, the valve cover is provided with a water inlet and a connecting port, one end of the valve cover is in threaded connection with the inner wall of the valve body, and the valve seat is arranged at one end, close to the valve body, of the valve cover. The valve element is arranged in the valve body, a guide cylinder is arranged at the end, close to the valve deck, of the valve element, the end, close to the valve deck, of the valve element abuts against the valve seat to form sealing, the guide cylinder penetrates through the valve seat and is arranged in the connecting opening in a penetrating mode, and the peripheral face of the guide cylinder is in sliding connection with the valve seat and the inner wall of the valve deck. The elastic assembly is arranged in the valve body and used for applying force to the valve element to enable the valve element to be close to the valve seat and allowing the valve seat to move in the direction away from the valve element. According to the utility model, the valve can be opened after a flow channel between the valve core and the valve seat reaches a certain size, so that the valve core is prevented from being damaged by a cavitation phenomenon caused by a narrow flow channel.

Description

Technical Field

[0001] This application relates to the field of axial flow check valve technology, and more particularly to an axial flow check valve. Background Technology

[0002] Axial flow check valves are specially designed check valves primarily used in pipeline systems to prevent backflow of media and protect equipment safety. Compared to traditional check valves (such as lift and swing valves), their core features are optimized flow path design and axial movement of the valve disc, resulting in lower flow resistance, faster response speed, and less water hammer effect.

[0003] Currently, Chinese invention patent CN108561599B, ​​published on January 2, 2024, provides an axial flow check valve, including a valve body, a valve disc assembly disposed within the valve body for opening and closing the valve body, and a first elastic element disposed within the valve body to provide elastic restoring force to the valve disc assembly. The axial flow check valve also includes a damping valve shaft. One end of the valve disc assembly is sleeved with the damping valve shaft. The portion of the damping valve shaft located within the valve disc assembly has a predetermined gap between the damping valve shaft and the valve disc assembly in the radial direction. The density of the valve disc assembly is equal to the density of the medium to be flowed into the valve body. The other end of the damping valve shaft is sleeved with a bushing fixed relative to the valve body. The bushing is sealed to the damping valve shaft. A damping hole is provided at the end of the bushing facing away from the valve disc assembly. A second elastic element is provided within the bushing to provide elastic restoring force to the damping valve shaft. This invention's axial flow check valve can slowly open the valve disc and completely close the valve disc during the closing process.

[0004] In axial flow check valves, when high-pressure liquid flows inside the valve, the valve disc separates from the sealing ring during opening and closing, resulting in a small opening. At this time, the flow channel between the valve disc and the sealing ring is narrow, which leads to an increase in the flow velocity and a decrease in pressure of the liquid. The sudden drop in liquid pressure causes cavitation at this point in the valve, which damages the valve's sealing surface. After long-term use, the valve is prone to leakage. Utility Model Content

[0005] This application provides an axial flow check valve, which can improve the technical problem in the related art where the valve disc is easily damaged by liquid cavitation when the valve is flowing at a small opening.

[0006] This application provides an axial flow check valve, including a valve body, a valve cover, a valve seat, a valve core, and an elastic component. The valve body has an outlet, and the valve cover has an inlet and a connection port. One end of the valve cover is inserted into the valve body and threadedly connected to the inner wall of the valve body. The valve seat is located at the end of the valve cover near the valve body. The valve core is located inside the valve body. A guide cylinder is provided at the end of the valve core near the valve cover. The end of the valve core near the valve cover abuts against the valve seat to form a seal. The guide cylinder passes through the valve seat and is located inside the connection port. The outer circumferential surface of the guide cylinder is slidably connected to the inner walls of the valve seat and the valve cover. The guide cylinder has multiple through holes. The elastic component is located inside the valve body and is used to apply a force to the valve core to bring it closer to the valve seat and allow the valve seat to move away from the valve core.

[0007] The technical solution described above in this application embodiment has at least the following technical effects: In the initial state, the valve core is pressed against the valve seat under the action of the elastic component and the liquid pressure inside the valve body, and the valve is in the closed state; after the valve is turned on, when the pressure of the liquid at the inlet is greater than the pressure of the liquid at the outlet by a certain amount, the liquid at the inlet pushes the valve core to separate it from the valve seat, and the guide cylinder slides inside the connection port. Since the through hole is a certain distance from the sealing surface of the valve seat, the valve is still in the closed state at this time. As the valve core and the guide cylinder continue to move, the sealing surface of the valve core gradually moves away from the sealing surface of the valve seat. After the through hole moves to the sealing surface of the valve seat, the inside of the valve body is connected to the connection port through the through hole, and the liquid begins to flow from the connection port into the inside of the valve body through the through hole, and the valve is opened. Since there is a certain distance between the sealing surface of the valve core and the sealing surface of the valve seat at this time, the flow channel between the two reaches a certain size, thereby avoiding the damage to the valve core caused by cavitation due to the narrow flow channel, and improving the service life of the valve.

[0008] The axial flow check valve provided in this application embodiment can open the valve only after the flow channel between the valve core and the valve seat reaches a certain size, thus avoiding damage to the valve core caused by cavitation due to narrow flow channel.

[0009] In some embodiments, the elastic component includes a spring and a spring seat, the spring seat being fixedly disposed inside the valve body, the spring being disposed inside the valve body, and the two ends of the spring abutting against the end of the valve core away from the valve cover and the spring seat, respectively.

[0010] In some embodiments, limit posts are fixedly provided at one end of the valve core near the spring seat and on the side of the spring seat near the valve core, and the two ends of the spring are respectively sleeved on the two limit posts.

[0011] In some embodiments, the guide cylinder and the valve core are integrally formed, and a first mounting groove is provided at one end of the valve cover near the valve core. The valve seat is slidably disposed inside the first mounting groove. A sealing gasket is also provided inside the first mounting groove. One side of the sealing gasket abuts against the side of the valve seat away from the valve core, and the other side abuts against the valve cover.

[0012] In some embodiments, a limiting groove is formed on the outer peripheral surface of the valve seat, and a limiting ring is fixedly provided on the inner peripheral surface of the valve cover, the limiting ring being located inside the limiting groove.

[0013] In some embodiments, a second mounting groove is provided on the outer peripheral surface of the valve core, and a first sealing ring is fitted inside the second mounting groove, the first sealing ring abutting against the valve seat.

[0014] In some embodiments, a sealing groove is provided on the outer peripheral surface of the valve cover, and a second sealing ring is fitted inside the sealing groove, the second sealing ring abutting against the inner peripheral surface of the valve body.

[0015] In some embodiments, a hexagonal body is provided on the outer peripheral surface of the valve body, and the hexagonal body is integrally formed with the valve body. Attached Figure Description

[0016] Figure 1 A schematic diagram of the overall structure of an axial flow check valve provided in an embodiment of this application;

[0017] Figure 2 A cross-sectional view of an axial flow check valve provided in an embodiment of this application;

[0018] Figure 3 for Figure 2 Enlarged view of section A in the middle;

[0019] Figure 4 This is a schematic diagram of the overall structure of the spring seat;

[0020] Figure 5 This is a schematic diagram of the overall structure of the valve core.

[0021] The following are the labeling elements in the figure:

[0022] 1. Valve body; 11. Outlet; 12. Hexagonal body; 2. Valve cover; 21. Inlet; 22. Connection port; 23. First mounting groove; 24. Sealing gasket; 25. Limiting ring; 26. Sealing groove; 27. Second sealing ring; 3. Valve seat; 31. Limiting groove; 4. Valve core; 41. Guide cylinder; 411. Through hole; 42. Second mounting groove; 43. First sealing ring; 51. Spring; 52. Spring seat; 6. Limiting post. Detailed Implementation

[0023] Based on this, in order to improve the technical problem that valve discs are easily damaged by liquid cavitation when valves are flowing at a small opening in related technologies, the embodiments of this application provide the following solutions.

[0024] The following combination Figures 1 to 5 The present invention will be described in further detail below.

[0025] This embodiment discloses an axial flow check valve, comprising a valve body 1, a valve cover 2, a valve seat 3, a valve core 4, and an elastic component. The valve body 1 has an outlet 11, and the valve cover 2 has an inlet 21 and a connection port 22. One end of the valve cover 2 is inserted into the valve body 1 and threadedly connected to the inner wall of the valve body 1. The valve seat 3 is located at the end of the valve cover 2 near the valve body 1. The valve core 4 is located inside the valve body 1. A guide cylinder 41 is provided at the end of the valve core 4 near the valve cover 2. The end of the valve core 4 near the valve cover 2 abuts against the valve seat 3 to form a seal. The guide cylinder 41 passes through the valve seat 3 and is located inside the connection port 22. The outer circumferential surface of the guide cylinder 41 is slidably connected to the valve seat 3 and the inner wall of the valve cover 2. The guide cylinder 41 has multiple through holes 411. The elastic component is located inside the valve body 1 and is used to apply a force to the valve core 4 to bring it closer to the valve seat 3 and allow the valve seat 3 to move away from the valve core 4.

[0026] As can be seen from the above, in the initial state, the axial flow check valve provided in this application embodiment is initially pressed against the valve seat 3 by the elastic component and the liquid pressure inside the valve body 1, and the valve is in the closed state. After the valve is turned on, when the pressure of the liquid at the inlet 21 is greater than the pressure of the liquid at the outlet 11 by a certain amount, the liquid at the inlet 21 pushes the valve core 4 to separate it from the valve seat 3, and the guide cylinder 41 slides inside the connection port 22. Since the through hole 411 is a certain distance from the sealing surface of the valve seat 3, the valve is still in the closed state at this time. As the valve core 4 and guide cylinder 41 continue to move, the sealing surface of the valve core 4 gradually moves away from the sealing surface of the valve seat 3. After the through hole 411 moves to the sealing surface of the valve seat 3, the inside of the valve body 1 is connected to the connection port 22 through the through hole 411. Liquid begins to flow from the connection port 22 into the inside of the valve body 1 through the through hole 411, and the valve opens. Since there is a certain distance between the sealing surface of the valve core 4 and the sealing surface of the valve seat 3 at this time, the flow channel between the two reaches a certain size, thereby avoiding the damage to the valve core 4 caused by cavitation due to narrow flow channel, and improving the service life of the valve.

[0027] In some embodiments, please refer to Figure 2 and Figure 4 The elastic component includes a spring 51 and a spring seat 52. The spring seat 52 is fixedly installed inside the valve body 1, and the spring 51 is installed inside the valve body 1. The two ends of the spring 51 abut against the end of the valve core 4 away from the valve cover 2 and the spring seat 52, respectively.

[0028] With this configuration, the spring 51 can continuously apply a thrust to the valve core 4 to bring it closer to the valve seat 3, while allowing the valve core 4 to move away from the valve seat 3 after the liquid pressure inside the inlet 21 reaches a certain level.

[0029] Optionally, in some embodiments, please refer to Figure 2 Limiting posts 6 are fixedly provided on one end of the valve core 4 near the spring seat 52 and on the other side of the spring seat 52 near the valve core 4. The two ends of the spring 51 are respectively sleeved on the two limiting posts 6.

[0030] With this configuration, the limiting post 6 can limit the position of the spring 51, preventing the spring 51 from shifting or falling off during valve use.

[0031] Optionally, please refer to Figure 2 and Figure 3 The guide cylinder 41 is integrally formed with the valve core 4. The valve cover 2 has a first mounting groove 23 at one end near the valve core 4. The valve seat 3 is slidably disposed inside the first mounting groove 23. A sealing gasket 24 is also disposed inside the first mounting groove 23. One side of the sealing gasket 24 abuts against the side of the valve seat 3 away from the valve core 4, and the other side abuts against the valve cover 2.

[0032] With this configuration, when the valve is closed, the liquid inside the valve body 1 and the spring 51 simultaneously push the valve core 4 closer to the valve seat 3. After the valve core 4 contacts the valve seat 3, the valve core 4 pushes the valve seat 3 to move, compressing the sealing pad 24. The sealing pad 24 can buffer the impact force between the valve core 4 and the valve seat 3, reducing the damage to the valve seat 3 and valve core 4 caused by the collision.

[0033] Optionally, in some embodiments, please refer to Figure 2 and Figure 3 A limiting groove 31 is provided on the outer circumferential surface of the valve seat 3, and a limiting ring 25 is fixedly provided on the inner circumferential surface of the valve cover 2. The limiting ring 25 is located inside the limiting groove 31.

[0034] With this configuration, when the valve seat 3 slides inside the first mounting groove 23, the limiting ring 25 can contact the valve seat 3 to limit its movement and prevent the valve seat 3 from detaching from the first mounting groove 23.

[0035] Optionally, please refer to Figure 3 and Figure 5 A second mounting groove 42 is provided on the outer circumferential surface of the valve core 4, and a first sealing ring 43 is sleeved inside the second mounting groove 42, and the first sealing ring 43 abuts against the valve seat 3.

[0036] With this configuration, when the valve core 4 contacts the valve seat 3, the first sealing ring 43 will contact the sealing surface of the valve seat 3 to form a seal, which can enhance the valve's sealing performance.

[0037] In some embodiments, please refer to Figure 2 A sealing groove 26 is provided on the outer circumferential surface of the valve cover 2, and a second sealing ring 27 is fitted inside the sealing groove 26. The second sealing ring 27 abuts against the inner circumferential surface of the valve body 1.

[0038] With this configuration, the second sealing ring 27 can seal the gap between the valve cover 2 and the valve body 1, preventing liquid from leaking from the gap between the valve cover 2 and the valve body 1.

[0039] In some embodiments, please refer to Figure 1 A hexagonal body 12 is provided on the outer peripheral surface of the valve body 1, and the hexagonal body 12 is integrally formed with the valve body 1.

[0040] With this configuration, when installing or removing the valve, the user can use a tool to clamp the hexagon 12 to fix the valve body 1, thus facilitating the user's operation.

[0041] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An axial flow check valve, characterized in that: The valve includes a valve body (1), a valve cover (2), a valve seat (3), a valve core (4), and an elastic component. The valve body (1) has an outlet (11), and the valve cover (2) has an inlet (21) and a connection port (22). One end of the valve cover (2) is inserted into the valve body (1) and threadedly connected to the inner wall of the valve body (1). The valve seat (3) is located at the end of the valve cover (2) near the valve body (1). The valve core (4) is located inside the valve body (1), and a guide tube is provided at the end of the valve core (4) near the valve cover (2). (41) The valve core (4) near the valve cover (2) abuts against the valve seat (3) to form a seal. The guide cylinder (41) passes through the valve seat (3) and is installed inside the connection port (22). The outer peripheral surface of the guide cylinder (41) is slidably connected to the valve seat (3) and the inner wall of the valve cover (2). The guide cylinder (41) has multiple through holes (411). The elastic component is installed inside the valve body (1) to apply a force to the valve core (4) to make it close to the valve seat (3) and allow the valve seat (3) to move away from the valve core (4).

2. The axial flow check valve according to claim 1, characterized in that: The elastic component includes a spring (51) and a spring seat (52). The spring seat (52) is fixedly disposed inside the valve body (1). The spring (51) is disposed inside the valve body (1). The two ends of the spring (51) abut against the end of the valve core (4) away from the valve cover (2) and the spring seat (52), respectively.

3. An axial flow check valve according to claim 2, characterized in that: Limiting posts (6) are fixedly provided on one end of the valve core (4) near the spring seat (52) and on the side of the spring seat (52) near the valve core (4). The two ends of the spring (51) are respectively sleeved on the two limiting posts (6).

4. An axial flow check valve according to claim 1, characterized in that: The guide cylinder (41) is integrally formed with the valve core (4). The valve cover (2) has a first mounting groove (23) at one end near the valve core (4). The valve seat (3) is slidably disposed inside the first mounting groove (23). A sealing pad (24) is also disposed inside the first mounting groove (23). One side of the sealing pad (24) abuts against the side of the valve seat (3) away from the valve core (4), and the other side abuts against the valve cover (2).

5. An axial flow check valve according to claim 4, characterized in that: A limiting groove (31) is provided on the outer circumferential surface of the valve seat (3), and a limiting ring (25) is fixedly provided on the inner circumferential surface of the valve cover (2), with the limiting ring (25) located inside the limiting groove (31).

6. An axial flow check valve according to claim 1, characterized in that: The valve core (4) has a second mounting groove (42) on its outer peripheral surface. A first sealing ring (43) is fitted inside the second mounting groove (42), and the first sealing ring (43) abuts against the valve seat (3).

7. An axial flow check valve according to claim 1, characterized in that: A sealing groove (26) is provided on the outer circumferential surface of the valve cover (2), and a second sealing ring (27) is fitted inside the sealing groove (26). The second sealing ring (27) abuts against the inner circumferential surface of the valve body (1).

8. An axial flow check valve according to claim 1, characterized in that: A hexagonal body (12) is provided on the outer peripheral surface of the valve body (1), and the hexagonal body (12) is integrally formed with the valve body (1).

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