A zero-leakage check valve with a soft seal and a swing type

Abstract

The utility model discloses a kind of swing type soft sealing zero-leakage check valve, including valve body, valve cover and check assembly, valve cover is fixedly connected with valve body by bolt, check assembly includes lug, rocker, fixed seat and valve seat, lug is fixed on valve cover, rotationally connected with lug between rocker, lug is provided with arc groove, the center of the arc groove is located on the axis of pivot, plug is provided on rocker, one end of plug is located in arc groove, the utility model is installed by sealing assembly on valve cover, when needing to maintain valve, sealing assembly can be simultaneously disassembled when valve cover is disassembled, so that valve seat can be conveniently replaced, it is simple and convenient to operate, and the maximum angle of rocker and fixed seat rotation is controlled by arc groove and plug, when valve is opened, rocker and fixed seat do not hit valve body and cause impact.

Description

Technical Field

[0001] This utility model discloses a swing-type soft-seal zero-leakage check valve, belonging to the field of valve technology. Background Technology

[0002] In a swing check valve, the valve disc is mounted on a pin on the valve seat. When the medium enters the valve body from the valve inlet, the medium pushes open the valve disc, which rotates around the pin to open. When no medium enters the valve inlet, the valve disc rotates around the pin to close, thus achieving the check valve function. In existing check valves, the maximum angle of valve disc rotation when the valve is open is mainly determined by the torsion spring and the maximum stroke of the valve disc against the valve body. That is, when the fluid pressure at the valve inlet is low, the fluid pushes the valve disc to rotate at a small angle, while when the fluid pressure is high, the fluid exerts a large thrust on the valve disc, causing the valve disc to rotate to its maximum angle instantaneously and collide with the valve body. This structure affects the service life and stability of the valve. Utility Model Content

[0003] The purpose of this invention is to solve the problems in the prior art by providing a swing-type soft-seal zero-leakage check valve.

[0004] This utility model achieves the above-mentioned objective through the following technical solution: a swing-type soft-seal zero-leakage check valve, comprising a valve body, a valve cover, and a check assembly. The valve cover and the valve body are fixedly connected by bolts. The check assembly includes a lifting lug, a rocker arm, a fixed seat, and a valve seat. The lifting lug is fixed on the valve cover. A rotating shaft is rotatably connected between the rocker arm and the lifting lug. An arc-shaped groove is provided on the lifting lug, and the center of the arc-shaped groove is located on the axis of the rotating shaft. A pin is provided on the rocker arm, and one end of the pin is located in the arc-shaped groove. Two protrusions are provided at the center of the fixed seat. One of the protrusions passes through the rocker arm, and the other protrusion passes through the valve seat. Nuts are provided on the two protrusions. After the pin is rotated to its maximum angle in the arc-shaped groove, neither the protrusion nor the rocker arm contacts the valve body.

[0005] Preferably, the end of the pin away from the arc-shaped groove is provided with a threaded hole.

[0006] Preferably, the fixed seat is provided with a plurality of springs arranged in an array on the side facing the valve seat, and there is a relative sliding gap between the valve seat and the fixed seat.

[0007] Preferably, the valve seat is provided with a countersunk hole for positioning the spring.

[0008] Preferably, a valve disc is detachably installed on the valve body at the position corresponding to the valve seat, and the valve disc has a sleeve structure.

[0009] Preferably, the central angle of the arc groove is 20-30°.

[0010] Preferably, a sealing ring is provided between the valve body and the valve cover, and flanges are provided at both ends of the valve body, with mounting holes provided on the flanges.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] 1. By setting up a rocker arm, lifting lug, pin, and arc groove, the valve seat is installed on the valve cover via the rocker arm and lifting lug. During installation and maintenance, it is only necessary to fix the valve cover to the valve body or remove the valve cover from the valve body. The operation is simple and convenient. At the same time, when the valve is open, the pin slides in the arc groove and controls the rotation angle of the valve seat and rocker arm, so that the two will not collide with the valve body, effectively ensuring the service life and stability of the valve.

[0013] 2. By installing a spring between the valve seat and the fixed seat, when the valve is closed, the valve seat and rocker arm reset under the action of gravity, so that the valve seat abuts against the valve disc, and the spring can reduce the impact force between the two. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of a swing-type soft-seal zero-leakage check valve according to the present invention;

[0015] Figure 2 This is a schematic diagram of the structure of the check valve assembly of this utility model;

[0016] Figure 3 This is a schematic diagram of the valve cover and lifting lug in this utility model;

[0017] Reference numerals in the attached drawings: 1. Valve body; 2. Valve seat; 3. Rocker arm; 4. Sealing ring; 5. Valve cover; 6. Lifting lug; 7. Spring; 8. Mounting hole; 9. Fixing seat; 10. Countersunk hole; 11. Valve disc; 12. Pin; 13. Protrusion; 14. Nut; 15. Threaded hole; 16. Shaft; 17. Arc groove. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] like Figures 1-3As shown, a swing-type soft-seal zero-leakage check valve includes a valve body 1, a valve cover 5, and a check assembly. The valve cover 5 is fixedly connected to the valve body 1 by bolts. The check assembly includes a lifting lug 6, a rocker arm 3, a fixed seat 9, and a valve seat 2. The lifting lug 6 is fixed on the valve cover 5. A rotating shaft 16 is rotatably connected between the rocker arm 3 and the lifting lug 6. An arc-shaped groove 17 is provided on the lifting lug 6, and the center of the arc-shaped groove 17 is located on the axis of the rotating shaft 16. A pin 12 is provided on the rocker arm 3, and one end of the pin 12 is located in the arc-shaped groove 17. Two protrusions 13 are provided at the center of the fixed seat 9. One protrusion 13 passes through the rocker arm 3, and the other protrusion 13 passes through the valve seat 2. Nuts 14 are provided on the two protrusions 13. The central angle of the arc-shaped groove 17 is 20-30°. After the pin 12 rotates to its maximum angle in the arc-shaped groove 17, neither the protrusion 13 nor the rocker arm 3 contacts the valve body 1.

[0020] The end of the pin 12 away from the arc groove 17 is provided with a threaded hole 15. By screwing the screw into the threaded hole 15, the pin 12 can be pulled out from the rocker arm 3 and the arc groove 17, thus facilitating the disassembly of the rocker arm 3 and the lifting lug 6.

[0021] Multiple arrayed springs 7 are provided on the side of the fixed seat 9 facing the valve seat 2. There is a relative sliding gap between the valve seat 2 and the fixed seat 9. When the fluid pressure at the inflow end is small or the fluid is cut off, the valve seat 2 and the rocker arm 3 will reset under the action of gravity, so that the valve seat 2 is reset. In this way, when the valve seat 2 abuts against the valve body 1, the spring 7 can play a buffering role. When the spring 7 is installed, one end is embedded in the countersunk hole 10, so that it will not bend during the compression process, thus ensuring the service life of the spring 7.

[0022] A valve disc 11 is detachably installed on the valve body 1 at the position corresponding to the valve seat 2. The valve disc 11 has a sleeve structure. By setting the valve disc 11, it directly contacts the valve seat 2 to seal and achieve a check valve effect, which can reduce the difficulty of assembling the valve seat 2 and the valve body 1.

[0023] A sealing ring 4 is provided between the valve body 1 and the valve cover 5. Flanges are provided at both ends of the valve body 1, and mounting holes 8 are provided on the flanges. The sealing ring 4 can ensure the sealing between the valve body 1 and the valve cover 5 and prevent fluid leakage. With the help of the flanges and mounting holes 8, the valve can be smoothly installed between two pipelines.

[0024] Working principle: When the fluid pressure at the inlet end of the valve is high, the fluid will push the valve seat 2 and rocker arm 3 to rotate around the pivot 16. The maximum rotation angle is achieved by the pin 12 and the arc groove 17. When the rocker arm 3 drives the pin 12 to rotate from one end of the arc groove 17 to the other end, the opening between the valve seat 2 and the valve disc 11 is at its maximum. At the same time, neither the rocker arm 3 nor the valve seat 2 will come into contact with the valve body 1. Thus, even if the fluid pushes the valve seat 2 and the rocker arm 3 to rotate to the maximum angle instantaneously, the rocker arm 3 and the valve seat 2 will not collide with the valve body 1, which can ensure the service life of the valve.

[0025] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0026] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A swing-type soft-seal zero-leakage check valve, comprising a valve body (1), a valve cover (5), and a check assembly, characterized in that, The valve cover (5) and valve body (1) are fixedly connected by bolts. The check valve assembly includes a lug (6), a rocker arm (3), a fixed seat (9), and a valve seat (2). The lug (6) is fixed on the valve cover (5). A rotating shaft (16) is rotatably connected between the rocker arm (3) and the lug (6). An arc groove (17) is provided on the lug (6), and the center of the arc groove (17) is located on the axis of the rotating shaft (16). A pin is provided on the rocker arm (3). 12), one end of the pin (12) is located in the arc groove (17), and two protrusions (13) are provided in the center of the fixed seat (9). One of the protrusions (13) passes through the rocker arm (3), and the other protrusion (13) passes through the valve seat (2). Nuts (14) are provided on the two protrusions (13). After the pin (12) rotates to the maximum angle in the arc groove (17), neither the protrusion (13) nor the rocker arm (3) abuts against the valve body (1).

2. The swing-type soft-seal zero-leakage check valve according to claim 1, characterized in that, The pin (12) has a threaded hole (15) at the end away from the arc groove (17).

3. A swing-type soft-seal zero-leakage check valve according to claim 1, characterized in that, The fixed seat (9) is provided with a plurality of springs (7) arranged in an array on the side facing the valve seat (2), and there is a relative sliding gap between the valve seat (2) and the fixed seat (9).

4. A swing-type soft-seal zero-leakage check valve according to claim 3, characterized in that, The valve seat (2) is provided with a countersunk hole (10) for positioning the spring (7).

5. A swing-type soft-seal zero-leakage check valve according to claim 1, characterized in that, The valve body (1) is detachably mounted with a valve disc (11) at the position corresponding to the valve seat (2), and the valve disc (11) has a sleeve structure.

6. A swing-type soft-seal zero-leakage check valve according to claim 1, characterized in that, The central angle of the arc groove (17) is 20-30°.

7. A swing-type soft-seal zero-leakage check valve according to claim 1, characterized in that, A sealing ring (4) is provided between the valve body (1) and the valve cover (5). Flanges are provided at both ends of the valve body (1), and mounting holes (8) are provided on the flanges.

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