Double seal for valves and double seal valve

Abstract

The application discloses a double-sealing piece and a double-sealing valve for a valve, and the valve rod is rotated by clockwise rotation of the hand wheel, the second sealing block is driven to move downwards, the first sealing block is pushed downwards by the fastening rod while the second sealing block is moving downwards, the small valve core seals the opening, and when the valve body is closed, a primary outer seal and a primary inner seal are formed at the same time, and more reliable sealing performance is provided; when the first sealing block is damaged due to impact, the second sealing block can continue to seal, and the sealing performance of the valve body is improved; when the valve body needs to be slightly adjusted, the valve rod is rotated by counterclockwise rotation of the hand wheel, the second sealing block and the first sealing block are driven to move upwards, the first sealing block stops rotating when the first sealing block is separated from the seal of the shunt pipe, at this moment, the small valve core is separated from the seal of the opening under the action that the first sealing block moves upwards, water flows into the water outlet from the shunt pipe and is discharged, and small-range flow adjustment can be realized.

Description

Technical Field

[0001] This invention belongs to the field of valve technology, specifically relating to a double-seal component for valves and a double-seal valve. Background Technology

[0002] Valves are control components in fluid transport systems. They are pipeline accessories used to open and close pipelines, control flow direction, and regulate and control the parameters (temperature, pressure, and flow rate) of the transported medium. The valve structure mainly uses valve plates, gates, valve balls, and other structures to achieve the sealing of the valve body, thereby achieving the shut-off of the fluid transport process, blocking the passage in the valve body, and thus shutting off the fluid, thereby achieving the overall control of the valve.

[0003] A search revealed Chinese patent application CN219082315U, which proposes a valve sealing structure. The structure includes a front valve body with a rear valve body on one side. The front and rear valve bodies are bolted together. An O-ring seal is provided at the contact point between the front and rear valve bodies. Valve seats are bolted to the interior of the front valve body and one side of the rear valve body. Sealing rings are provided at the contact points between the valve seats and both the front and rear valve bodies. A ball is positioned between the valve seats, with its outer circular wall tightly fitted to the adjacent sides of the two valve seats. Through the combined action of a packing gasket and a packing gland, a good sealing effect is achieved between the valve stem body and the valve stem hole of the front valve body.

[0004] Existing valve sealing structures, such as those described above, can seal the valve body, but when fluid passes through the sealing element, the flow rate increases due to the small channel area. This rapid flow of fluid often has an erosive effect on the valve seals, especially during the moment when the valve is opened and closed. The large pressure difference between the two ends of the valve makes the erosion of the rubber and plastic seals extremely significant, causing them to age. This aging directly reduces the valve's sealing performance, thus affecting the valve's performance. Summary of the Invention

[0005] The purpose of this invention is to provide a double-seal element and a double-seal valve for valves, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a double sealing element for a valve, comprising a valve body, wherein an inlet and an outlet are respectively provided at both ends of the valve body, a cavity is provided in the valve body at the junction of the inlet and the outlet, sealing plates are fixedly connected to both sides of the cavity, an outlet is provided on the right side of the sealing plate at the junction with the outlet, sealing seats are fixedly connected to both sides of the bottom of the sealing plate, a first sealing block is provided in the cavity between the two sets of sealing plates, and a second sealing block is slidably connected to the top of the first sealing block through a fastening rod.

[0007] Preferably, a small valve core is fixedly connected to the bottom of the first sealing block, and a sliding groove is provided in the middle of the second sealing block, with the fastening rod at the top of the first sealing block slidably connected in the sliding groove.

[0008] Preferably, a guide rod is fixedly connected to the top of the first sealing block and to both sides of the fastening rod. The top of the guide rod slides through a guide groove provided on the surface of the second sealing block. A spring is sleeved on the guide rod, and the two ends of the spring are fixedly connected to the first sealing block and the second sealing block, respectively.

[0009] Preferably, an opening is provided between the two sets of sealing seats, and the bottom of the small valve core is fitted with the opening to seal it. A diversion pipe is provided on the right side of the cavity and at the top of the sealing seat, and the diversion pipe is connected to the water outlet.

[0010] Preferably, a valve cover is bolted to the top of the valve body.

[0011] Preferably, a valve stem is rotatably connected to the top of the second sealing block, and the other end of the valve stem rotatably passes through the valve cover and extends to the outside. A handwheel is fixedly connected to the end of the valve stem extending to the outside.

[0012] Preferably, the surfaces of the first sealing block, the second sealing block, and the small valve core are all provided with sealing rings.

[0013] The present invention also provides a double-seal valve, wherein the double-seal valve comprises the above-described double-seal element for valves.

[0014] Preferably, the double-sealed valve further includes two sets of connecting pipes connected to the valve body, and the connecting pipes are equipped with filter screens.

[0015] Preferably, a sealing element is fixedly connected to the outer side of each set of connecting pipes, and the sealing element has an annular groove and a rubber ring is provided in the annular groove.

[0016] The technical effects and advantages of this invention are as follows: The valve uses a double sealing element and a double-sealed valve. By rotating the handwheel clockwise, the valve stem rotates, which drives the second sealing block to move downward. At the same time, the second sealing block moves downward, pushing the first sealing block downward through the fastening rod. Both the first and second sealing blocks are in contact with the inner wall of the sealing plate through sealing rings on both sides and seal the cavity. The small valve core seals the opening. When the valve body is closed, a first-stage external seal and a first-stage internal seal can be formed simultaneously, providing more reliable sealing performance. When the first sealing block is damaged due to impact, the second sealing block can continue to seal, improving the sealing performance of the valve body.

[0017] When the valve body requires fine-tuning of the flow, rotating the handwheel counterclockwise causes the valve stem to rotate, which in turn moves the second sealing block and the first sealing block upwards. When the first sealing block is released from the seal on the diversion pipe, the rotation stops. At this time, under the action of the upward movement of the first sealing block, the small valve core is released from the seal on the opening, and the water flows from the diversion pipe into the outlet and is discharged. By releasing the seal on the small valve core and draining water from the diversion pipe, a small range of flow regulation can be achieved, and the flow control accuracy of the valve body can be improved. By rotating the handwheel counterclockwise to adjust the position of the second sealing block, the first sealing block, and the small valve core, they can be completely released from the seal on the opening, outlet, and diversion pipe to achieve rapid and wide-range flow.

[0018] When the valve body is connected to an external pipeline, the seal can be inserted into the annular groove on the seal and sealed by a rubber ring to ensure the sealing of the pipeline connection and prevent media leakage. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the present invention;

[0020] Figure 2 This is a cross-sectional view of the present invention;

[0021] Figure 3 This is a schematic diagram of the structure of the first sealing block of the present invention disengaging from the seal on the diversion pipe;

[0022] Figure 4 This is a schematic diagram of the structure of the first sealing block and the second sealing block of the present invention disengaging from the outlet seal;

[0023] Figure 5 For the present invention Figure 2 Enlarged view of point A in the middle;

[0024] Figure 6 This is a schematic diagram of the connecting pipe of the present invention;

[0025] Figure 7 This is a schematic diagram of the structure of the sealing element of the present invention.

[0026] In the diagram: 1. Valve body; 101. Spring; 102. Small valve core; 103. Outlet; 104. Fastening rod; 2. Inlet; 3. Outlet; 4. Cavity; 5. Sealing plate; 6. Sealing seat; 7. First sealing block; 8. Second sealing block; 9. Slide groove; 10. Guide rod; 11. Guide groove; 12. Opening; 13. Diverter pipe; 14. Bolt; 15. Valve cover; 16. Valve stem; 17. Handwheel; 18. Sealing ring; 19. Connecting pipe; 20. Filter screen; 21. Seal; 22. Annular groove; 23. Rubber ring. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] This invention provides, for example Figure 1-7 The valve body 1 is shown as a double sealing element for a valve, comprising a valve body 1 with an inlet 2 and an outlet 3 at both ends. A cavity 4 is provided inside the valve body 1 at the junction of the inlet 2 and the outlet 3. Sealing plates 5 are fixedly connected to both sides of the cavity 4. An outlet 103 is provided on the right side of the sealing plate 5 at the junction with the outlet 3. Sealing seats 6 are fixedly connected to both sides of the bottom of the sealing plate 5. A first sealing block 7 is provided inside the cavity 4 between the two sets of sealing plates 5. A second sealing block 8 is slidably connected to the top of the first sealing block 7 via a fastening rod 104.

[0029] The bottom of the first sealing block 7 is fixedly connected to a small valve core 102. The middle of the second sealing block 8 is provided with a sliding groove 9. The fastening rod 104 at the top of the first sealing block 7 is slidably connected in the sliding groove 9. The second sealing block 8 moves downward and pushes the first sealing block 7 and the small valve core 102 to move through the fastening rod 104. When the small valve core 102 seals with the opening 12, the handwheel 17 is rotated to make the second sealing block 8 fit with the first sealing block 7, increasing the sealing strength between them and preventing shaking when a large flow of water impacts the first sealing block 7.

[0030] A guide rod 10 is fixedly connected to the top of the first sealing block 7 and to both sides of the fastening rod 104. The top of the guide rod 10 slides through the guide groove 11 provided on the surface of the second sealing block 8. A spring 101 is sleeved on the guide rod 10 and the two ends of the spring 101 are fixedly connected to the first sealing block 7 and the second sealing block 8 respectively. When the second sealing block 8 moves upward and drives the first sealing block 7, the force on both sides of it is more even.

[0031] An opening 12 is provided between the two sets of sealing seats 6. The bottom of the small valve core 102 is sealed by cooperating with the opening 12. A diversion pipe 13 is provided on the right side of the cavity 4 and at the top of the sealing seat 6, and the diversion pipe 13 is connected to the water outlet 3.

[0032] The valve body 1 is screwed to the top of the valve cover 15 by bolts 14. The valve cover 15 can be easily disassembled and inspected later.

[0033] The top of the second sealing block 8 is rotatably connected to a valve stem 16, and the other end of the valve stem 16 rotatably passes through the valve cover 15 and extends to the outside. A handwheel 17 is fixedly connected to the end of the valve stem 16 that extends to the outside. Rotating the handwheel 17 can adjust the position of the second sealing block 8, the first sealing block 7, and the small valve core 102.

[0034] The first sealing block 7, the second sealing block 8, and the small valve core 102 are all provided with sealing rings 18, which are used to seal and improve the tightness of the internal sealing of the valve body 1.

[0035] The present invention also provides a double-seal valve, wherein the double-seal valve comprises the above-described double-seal element for valves.

[0036] The double-sealed valve also includes two sets of connecting pipes 19 connected to the valve body 1. The connecting pipes 19 are equipped with a filter screen 20, which can filter impurities in the water when the water flows into the valve body 1, so as to avoid blockage inside the valve body 1.

[0037] Each set of connecting pipes 19 is fixedly connected to a sealing element 21 on its outer side. The sealing element 21 has an annular groove 22 and a rubber ring 23 inside the annular groove 22. The sealing element 21 can ensure the sealing of the pipe connection when the valve body 1 is connected to the external pipe.

[0038] The valve uses a double sealing element and a double-sealed valve. Rotating the handwheel 17 clockwise causes the valve stem 16 to rotate, which drives the second sealing block 8 to move downward. At the same time, the second sealing block 8 moves downward through the fastening rod 104, pushing the first sealing block 7 downward. Both the first sealing block 7 and the second sealing block 8 are in contact with the inner wall of the sealing plate 5 through the sealing ring 18 on both sides, sealing the cavity 4. The small valve core 102 seals the opening 12. When the valve body 1 is closed, the first sealing block 7 and the second sealing block 8 can simultaneously form a first-level external seal and a first-level internal seal, providing more reliable sealing performance. When the first sealing block 7 is damaged due to impact, the second sealing block 8 can continue to seal, improving the sealing performance of the valve body 1.

[0039] When valve body 1 requires fine-tuning of the flow, please refer to [link / reference]. Figure 3 When the handwheel 17 is rotated counterclockwise, the valve stem 16 rotates, causing the second sealing block 8 and the first sealing block 7 to move upwards. The rotation stops when the first sealing block 7 disengages from the seal on the diversion pipe 13. At this point, under the upward movement of the first sealing block 7, the small valve core 102 disengages from the seal on the opening 12, and water flows from the diversion pipe 13 into the outlet 3 and is discharged. By allowing the small valve core 102 to disengage from the seal on the opening 12 and drain water from the diversion pipe 13, a smaller range of flow regulation can be achieved, improving the flow control accuracy of the valve body 1. For larger flow regulation, please refer to [reference needed]. Figure 4By rotating the handwheel 17 counterclockwise, the positions of the second sealing block 8, the first sealing block 7, and the small valve core 102 are adjusted so that they are completely freed from the blockage of the opening 12, the outlet 103, and the diversion pipe 13. The liquid enters from the inlet 2 and is discharged from the outlet 103 and the diversion pipe 13 through the opening 12 to the outlet 3 and then discharged, thereby achieving a fast and wide flow rate.

[0040] When the valve body 1 is connected to an external pipeline, the sealing element 21 can be inserted into the annular groove 22 on the sealing element 21 and sealed by the rubber ring 23 to ensure the sealing of the pipeline connection and prevent media leakage.

[0041] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A double-seal element for a valve, comprising a valve body (1), characterized in that: The valve body (1) has an inlet (2) and an outlet (3) at both ends. A cavity (4) is provided inside the valve body (1) at the junction of the inlet (2) and the outlet (3). A sealing plate (5) is fixedly connected to both sides of the cavity (4). An outlet (103) is provided on the right side of the sealing plate (5) at the junction with the outlet (3). A sealing seat (6) is fixedly connected to both sides of the bottom of the sealing plate (5). A first sealing block (7) is provided inside the cavity (4) between the two sets of sealing plates (5). A second sealing block (8) is slidably connected to the top of the first sealing block (7) through a fastening rod (104). The bottom of the first sealing block (7) is fixedly connected to a small valve core (102), and the middle of the second sealing block (8) is provided with a sliding groove (9). The fastening rod (104) at the top of the first sealing block (7) is slidably connected in the sliding groove (9). An opening (12) is provided between the two sets of sealing seats (6), and the bottom of the small valve core (102) is sealed in conjunction with the opening (12). A diversion pipe (13) is provided on the right side of the cavity (4) and at the top of the sealing seat (6), and the diversion pipe (13) is connected to the water outlet (3).

2. The double seal for a valve according to claim 1, characterized in that: A guide rod (10) is fixedly connected to the top of the first sealing block (7) and on both sides of the fastening rod (104). The top of the guide rod (10) slides through the guide groove (11) provided on the surface of the second sealing block (8). A spring (101) is sleeved on the guide rod (10) and the two ends of the spring (101) are fixedly connected to the first sealing block (7) and the second sealing block (8) respectively.

3. A double seal for a valve according to claim 1, characterized in that: The valve body (1) is topped with a valve cover (15) by bolts (14).

4. A double seal for a valve according to claim 3, characterized in that: The top of the second sealing block (8) is rotatably connected to a valve stem (16), and the other end of the valve stem (16) rotatably passes through the valve cover (15) and extends to the outside. A handwheel (17) is fixedly connected to the end of the valve stem (16) that extends to the outside.

5. A double seal for a valve according to claim 1, characterized in that: The first sealing block (7), the second sealing block (8), and the small valve core (102) are all provided with sealing rings (18).

6. A double-seal valve, characterized in that: The double-seal valve comprises the double seal element for valves as described in any one of claims 1-5.

7. A double-seal valve according to claim 6, characterized in that: It also includes two sets of connecting pipes (19) and the connecting pipes (19) are connected to the valve body (1), and the connecting pipes (19) are provided with a filter screen (20).

8. A double-seal valve according to claim 7, characterized in that: Each of the connecting pipes (19) is fixedly connected to a sealing element (21) on its outer side. The sealing element (21) has an annular groove (22) and a rubber ring (23) is provided inside the annular groove (22).

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