Swing check valve capable of being opened at low flow

Abstract

The utility model discloses a swing check valve capable of being opened at low flow, and belongs to the technical field of valves. The valve comprises a valve body, an inlet side and an outlet side are arranged in the valve body, a valve seat is arranged between the inlet side and the outlet side, a valve clack assembly is arranged in the valve body and comprises a rocker arm, a balancing weight and a valve clack, the rocker arm is rotationally connected with the valve body, the balancing weight is fixed to the upper end of the rocker arm, and the valve clack is arranged on the valve seat. The valve clack is fixed at the lower end of the rocker arm; the sealing face of the valve seat is arranged to be an inclined face, the included angle between the inclined face and the vertical face ranges from 5 degrees to 30 degrees, and when the check valve is closed, the valve clack abuts against the inclined face. The gravity center of the valve clack is higher, so that impact force of water flow on the valve clack can overcome gravitational torque more easily under low flow, and the valve clack is opened.

Description

Technical Field

[0001] The present application relates to the technical field of valves, and in particular to a swing check valve that opens at a low flow rate. Background Art

[0002] The swing check valve is a commonly used valve. Its structure mainly includes a valve body, a valve disc, a rocker arm and a valve seat. The rocker arm is movably hinged in the valve body, and the valve disc is fixed at the lower end of the rocker arm and can form a seal with the valve seat through the hinged rotation of the rocker arm. However, in actual applications, since the valve disc is heavy and mostly located at the lower end of the rocker arm, it is necessary to overcome a large gravitational torque when the rocker arm rotates to open the valve disc through the hinged rotation, making it difficult to open the valve disc at low pressure, affecting the normal operation of the system.

[0003] In related art, patent publication number CN202580150U discloses a low-pressure opening swing check valve comprising a valve body, a valve seat, a valve disc, and a rocker. The valve disc is mounted within the valve body, with the valve seat mounted between the valve disc and the valve body. The upper end of the rocker is movably hinged to the valve body, while the lower end of the rocker is fixed to the valve disc. The upper end of the rocker, which is movably hinged to the valve body, also includes an upwardly extending extension. A counterweight is fixed to the extension of the rocker, and the counterweight and the valve disc are located on either side of the rocker, respectively. With this structure, the utility model adds an upwardly extending extension to the upper end of the rocker and fixes a counterweight to the extension. Therefore, the counterweight shifts the center of gravity of the rocker and the valve disc connected to the rocker upward, closer to the rocker's rotation point, reducing the gravitational torque during rotation and lowering the valve disc opening pressure, thereby facilitating valve disc opening.

[0004] Regarding the above-mentioned related technologies, when the valve disc closes the valve seat, the valve disc is basically in a vertical state and its center of gravity is lower. When the valve disc needs to be opened, the weight of the required counterweight block needs to be larger to better balance with the valve disc. If the weight of the counterweight block is too heavy, it will easily affect the disassembly and assembly of the counterweight block. Utility Model Content

[0005] In order to ensure that the counterweight block reduces the opening pressure of the valve disc under the premise of a certain weight, the present application provides a low-flow opening swing check valve.

[0006] The present application provides a low-flow opening swing check valve that adopts the following technical solution:

[0007] A low-flow open swing check valve comprises a valve body, wherein the valve body is provided with an inlet side and an outlet side, a valve seat is provided between the inlet side and the outlet side, a valve disc assembly is provided in the valve body, and the valve disc assembly comprises a rocker arm, a counterweight, and a valve disc, wherein the rocker arm is rotatably connected to the valve body, the counterweight is fixed to the upper end of the rocker arm, and the valve disc is fixed to the lower end of the rocker arm;

[0008] The sealing surface of the valve seat is configured as an inclined surface, the inclined surface extends toward the outlet side, and the angle between the inclined surface and the vertical surface is 5°-30°. When the check valve is closed, the valve flap abuts against the inclined surface.

[0009] By adopting the above technical solution, by designing the sealing surface of the valve seat as an inclined surface, when the check valve is closed, the valve disc abuts the inclined surface. At this time, the valve disc's center of gravity is higher, thus reducing the gravitational torque required to open the valve disc. Due to the reduced gravitational torque, the impact force of the water flow on the valve disc can more easily overcome the gravitational torque at low flow rates, thereby opening the valve disc. Therefore, this structure reduces the flow rate required to open the valve disc while maintaining a certain weight, allowing the check valve to operate normally even at low flow rates, thereby improving the sensitivity and efficiency of the check valve.

[0010] Optionally, an arc-shaped groove is provided at the center of the valve flap, and the opening of the arc-shaped groove faces the inner cavity of the valve seat.

[0011] By adopting the above technical solution, this design can further increase the center of gravity of the valve disc and reduce the valve disc opening torque. In addition, it can reduce the contact area when the valve disc is closed, thereby reducing friction and making the valve disc easier to open.

[0012] Optionally, the valve flap is arranged in an arched shape, and the arched side of the valve flap is inclined toward the upper side of the outlet.

[0013] By adopting the above technical solution, the center of gravity of the valve disc is further increased, and the force required for opening is further reduced.

[0014] Optionally, the counterweight block is a plate-shaped counterweight block, and the plate surface of the plate-shaped counterweight block is parallel to the flow direction of water in the valve body.

[0015] By adopting the above technical solution, the design of the plate-shaped counterweight block not only ensures the counterweight effect, but also reduces the resistance of the water flow to the counterweight block because its plate surface is parallel to the water flow direction, further reducing the pressure required to open the valve disc.

[0016] Optionally, the center of the counterweight block is detachably connected to the rocker arm.

[0017] By adopting the above technical solution, this design allows the counterweight block to be easily installed and disassembled, making it easier to repair the check valve and replace the counterweight block.

[0018] Optionally, the upper end of the rocker arm can abut against the inner wall of the valve body above the valve seat. When the upper end of the rocker arm abuts against the inner wall of the valve body, the valve disc does not contact the inner wall of the valve body.

[0019] By adopting the above technical solution, the opening angle of the valve disc is larger, and the valve disc does not collide with the inner wall of the valve body, thereby extending the service life of the valve disc and the check valve.

[0020] Optionally, the rocker arm is rotatably connected to the valve body via a pin shaft, and both ends of the pin shaft are connected to the inner wall of the valve body.

[0021] By adopting the above technical solution, it is ensured that the rotating part is arranged in the valve body, thereby avoiding sealing problems at the rotating part that cause water to leak out of the valve body.

[0022] Optionally, an installation groove is provided on the inner wall of the valve body, and both ends of the pin shaft can enter the installation groove through the notch of the installation groove, and the notch of the installation groove is provided with a limit assembly for preventing the pin shaft from detaching from the installation groove.

[0023] By adopting the above technical solution, the convenience of disassembling and assembling the pin shaft is improved.

[0024] Optionally, an anti-rotation structure is provided at the end of the pin shaft, the anti-rotation structure is engaged with the groove wall of the installation groove, and the pin shaft is rotationally connected to the rocker arm.

[0025] By adopting the above technical solution, the design of the anti-rotation structure ensures the stability of the pin shaft in the installation groove and prevents malfunctions caused by the rotation of the pin shaft.

[0026] In summary, this application includes at least one of the following beneficial technical effects:

[0027] 1. The valve seat's sealing surface is designed as an inclined plane. When the check valve is closed, the disc contacts the inclined plane, placing the disc's center of gravity higher. This reduces the gravitational moment that the disc must overcome to open. This reduction in gravitational moment makes it easier for the impact of the water flow on the disc to overcome the gravitational moment at low flow rates, thereby opening the disc.

[0028] 2. The arc-shaped groove in the center of the valve disc and the arched setting of the valve disc make the valve disc easier to open, further improving the performance of the check valve.

[0029] 3. The design of the plate-shaped counterweight not only ensures the counterweight effect, but also reduces the resistance of the water flow to the counterweight, further reducing the pressure required to open the valve disc.

[0030] 4. By setting up structures such as installation grooves, pin shafts and limit components, the stable operation of the check valve is guaranteed, and its reliability and service life are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a cross-sectional view of the overall structure of the embodiment of the present application.

[0032] Figure 2This is a structural diagram mainly showing the valve flap assembly in an embodiment of the present application.

[0033] Figure 3 This is a schematic diagram of an embodiment of the present application mainly showing the internal structure of the check valve.

[0034] Description of reference numerals:

[0035] 10. Valve body; 11. Inlet side; 12. Outlet side; 13. Mounting groove; 20. Valve seat; 21. Inclined surface; 30. Valve disc assembly; 31. Rocker arm; 32. Counterweight; 33. Valve disc; 331. Arc groove; 34. Pin; 341. Anti-rotation structure; 342. Limiting part; 343. Limiting sleeve; 40. Limiting assembly. DETAILED DESCRIPTION

[0036] The following is combined with Figure 1-3 This application is described in further detail.

[0037] The low flow opening swing check valve provided in the embodiment of the present application is as follows: Figure 1 As shown, the valve body 10 includes an inlet side 11 and an outlet side 12 , and a valve seat 20 is arranged between the inlet side 11 and the outlet side 12 .

[0038] Reference Figure 1 and Figure 2 The valve body 10 is also equipped with a valve flap assembly 30, which mainly consists of a rocker arm 31, a counterweight 32 and a valve flap 33. The rocker arm 31 is rotatably connected to the inner wall of the valve body 10, the counterweight 32 is fixed to the upper end of the rocker arm 31, and the valve flap 33 is detachably mounted on the lower end of the rocker arm 31.

[0039] Specifically, the sealing surface of the valve seat 20 is specially designed as a sloped surface 21, which extends toward the outlet side 12. The angle between the sloped surface 21 and the vertical surface is maintained within a range of 5°-30°. When the check valve is in the closed state, the valve flap 33 fits tightly against this sloped surface 21. In this embodiment, the angle between the sloped surface 21 and the vertical surface is 30°. Due to the provision of the sloped surface 21, the center of gravity of the valve flap 33 is higher, reducing the gravitational torque that the valve flap 33 must overcome to open. This makes it easier for the impact force of the water flow on the valve flap 33 to overcome the gravitational torque, thereby opening the valve flap 33 at low flow rates.

[0040] In a preferred embodiment, a curved recess 331 is defined at the center of the valve flap 33. The opening of this curved recess 331 faces the inner cavity of the valve seat 20. This design effectively reduces the contact area of the valve flap 33 when closed, thereby reducing friction and making it easier to open the valve flap 33. Furthermore, the overall shape of the valve flap 33 is arched, with one side of the arch slightly tilted upward toward the outlet 12. This structure further raises the center of gravity of the valve flap 33, reducing the pressure required to open it.

[0041] In a preferred embodiment, the counterweight 32 is designed to be plate-shaped, with its plate surface parallel to the direction of water flow within the valve body 10. This design not only ensures the counterweight effect, but also, because its plate surface is aligned with the direction of water flow, it can reduce the resistance of the water flow to the counterweight 32, further reducing the pressure required to open the valve flap 33, allowing water to flow more smoothly through the check valve, thereby improving its performance. Furthermore, a detachable connection is adopted between the center position of the counterweight 32 and the rocker arm 31. Optionally, the counterweight 32 and rocker arm 31 are connected by bolts.

[0042] At the same time, the upper end of the rocker arm 31 can also be configured in a plate-like shape. This plate-shaped upper end of the rocker arm 31 can abut against the inner wall of the valve body 10 above the valve seat 20, thereby limiting the position of the rocker arm 31. When the upper end of the rocker arm 31 abuts the inner wall of the valve body 10 above the valve seat 20, the check valve is fully open, and the valve disc 33 does not contact the inner wall of the valve body 10. This design allows the valve disc 33 to open at a wider angle and prevents it from colliding with the inner wall of the valve body 10, thereby extending the service life of the valve disc 33 and the check valve.

[0043] In one embodiment, the rocker arm 31 is rotatably connected to the valve body 10 via a pin 34, with both ends of the pin 34 securely connected to the inner wall of the valve body 10. This connection method not only ensures stable rotation of the rocker arm 31, but also simplifies the overall structure and improves product reliability.

[0044] Reference Figure 2 and Figure 3Specifically, a mounting groove 13 is provided on the inner wall of the valve body 10, and both ends of the pin 34 can enter the mounting groove 13 through the notch of the mounting groove 13. In order to ensure that the pin 34 does not fall out of the mounting groove 13, a limit assembly 40 is specially provided at the notch. In this embodiment, the limit assembly 40 includes a limit block, which is pressed into the notch of the mounting groove 13, and the limit block is connected to the inner wall of the valve body 10 by a bolt. In another embodiment, this limit assembly 40 is mainly composed of elastic parts, which partially protrude from the notch of the mounting groove 13 in a natural state, thereby effectively preventing the pin 34 from falling out of the mounting groove 13. Specifically, these elastic parts are spring sheets, one end of which is tightly connected to the bottom of the mounting groove 13, while the other end is bent in a natural state and partially protrudes from the notch of the mounting groove 13, thereby effectively limiting the pin 34.

[0045] Furthermore, an anti-rotation structure 341 is designed at the end of the pin shaft 34, which includes at least one planar portion, which fits tightly with the corresponding groove wall of the installation groove 13, thereby effectively preventing the pin shaft 34 from rotating in the installation groove 13.

[0046] At this time, the rocker arm 31 is rotatably connected to the pin 34. To prevent the rocker arm 31 from moving in the axial direction, a limiting portion 342 and a limiting sleeve 343 are provided on the pin 34. The limiting portion 342 and the limiting sleeve 343 together limit the two sides of the rocker arm 31 to ensure that the valve disc 33 can effectively open and close the valve seat 20.

[0047] In summary, the check valve of the present application not only reduces the flow rate required to open the valve flap 33 through a series of sophisticated designs, thereby improving its sensitivity and efficiency, but also ensures the stability and reliability of the overall structure, thereby greatly extending the service life of the product.

[0048] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A low flow open swing check valve, characterized in that: The valve body (10) comprises an inlet side (11) and an outlet side (12) provided in the valve body (10), a valve seat (20) being provided between the inlet side (11) and the outlet side (12), a valve flap assembly (30) being provided in the valve body (10), the valve flap assembly (30) comprising a rocker arm (31), a counterweight (32) and a valve flap (33), the rocker arm (31) being rotatably connected to the valve body (10), the counterweight (32) being fixed to the upper end of the rocker arm (31), and the valve flap (33) being fixed to the lower end of the rocker arm (31); The sealing surface of the valve seat (20) is configured as an inclined surface (21), the inclined surface (21) extends toward the outlet side (12), and the angle between the inclined surface (21) and the vertical surface is 5°-30°. When the check valve is closed, the valve flap (33) abuts against the inclined surface (21).

2. A low-flow opening swing check valve according to claim 1, characterized in that: An arc-shaped groove (331) is provided at the center of the valve flap (33), and the opening of the arc-shaped groove (331) faces the inner cavity of the valve seat (20).

3. A low-flow opening swing check valve according to claim 2, characterized in that: The valve flap (33) is arranged in an arched shape, and the arched side of the valve flap (33) is inclined toward the upper side of the outlet side (12).

4. A low-flow opening swing check valve according to claim 1, characterized in that: The counterweight block (32) is a plate-shaped counterweight block (32), and the plate surface of the plate-shaped counterweight block (32) is parallel to the flow direction of the water in the valve body (10).

5. A low-flow opening swing check valve according to claim 4, characterized in that: The center of the counterweight (32) is detachably connected to the rocker arm (31).

6. A low-flow opening swing check valve according to claim 1, characterized in that: The upper end of the rocker arm (31) can abut against the inner wall of the valve body (10) above the valve seat (20); when the upper end of the rocker arm (31) abuts against the inner wall of the valve body (10), the valve flap (33) does not contact the inner wall of the valve body (10).

7. The low-flow opening swing check valve according to claim 1, characterized in that: The rocker arm (31) is rotatably connected to the valve body (10) via a pin shaft (34), and both ends of the pin shaft (34) are connected to the inner wall of the valve body (10).

8. The low-flow opening swing check valve according to claim 7, characterized in that: The inner wall of the valve body (10) is provided with a mounting groove (13), and both ends of the pin shaft (34) can enter the mounting groove (13) through the notch of the mounting groove (13), and the notch of the mounting groove (13) is provided with a limit assembly (40) for preventing the pin shaft (34) from detaching from the mounting groove (13).

9. A low-flow opening swing check valve according to claim 8, characterized in that: An anti-rotation structure (341) is provided at the end of the pin shaft (34), the anti-rotation structure (341) is engaged with the groove wall of the installation groove (13), and the pin shaft (34) is rotationally connected to the rocker arm (31).

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