Pressure self-adjusting double-sealing gate valve

Abstract

The utility model discloses a pressure self-adjusting double-sealing gate valve, and relates to the technical field of gate valves. The pressure relief gate valve comprises a gate valve body, a plugging assembly is arranged in the gate valve body, and a pressure relief assembly is arranged in a plugging disc close to the inlet end of the gate valve body. A second bevel gear drives a first bevel gear to rotate, the first bevel gear drives a threaded rod to rotate, the threaded rod drives a sliding block to reversely move in a sliding groove, the sliding block drives a connecting block to move, and the connecting block drives a plugging disc to move to be attached to a positioning ring, so that the situation that leakage easily occurs due to single sealing can be avoided, and the purpose of improving the sealing performance is achieved; when pressure is applied, the blocking plate moves, water in the pipeline enters the gate valve body from the pressure relief hole, and after the pressure of the pipeline is reduced, the reset spring drives the blocking plate to reset through elastic force to block the pressure relief hole, so that the situation that the gate valve blocking structure is damaged due to too large pressure of the pipeline can be avoided, and the purpose of automatic pressure relief is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of gate valves, in particular to a pressure self-regulating double-sealed gate valve. Background Technique

[0002] A gate valve is a closing member, a gate plate. The moving direction of the gate plate is perpendicular to the fluid direction. The gate valve can only be fully opened and fully closed, and cannot be adjusted and throttled.

[0003] Most of the existing gate valves are of single-sealed structure. Single sealing is prone to leakage and the sealing effect is poor. Moreover, excessive pipeline pressure is likely to cause damage to the plugging structure. Content of the Utility Model

[0004] In order to solve the problem of poor sealing effect of single sealing; the purpose of the utility model is to provide a pressure self-regulating double-sealed gate valve.

[0005] To solve the above technical problems, the utility model adopts the following technical scheme: a pressure self-regulating double-sealed gate valve, including a gate valve body. A plugging assembly is arranged inside the gate valve body. The plugging assembly includes a plugging disc. The plugging discs are symmetrically distributed and slidably clamped inside the gate valve body. Symmetrically distributed positioning rings are fixedly arranged inside the gate valve body. One side of the positioning ring is attached to one side of the plugging disc. A chute is opened on the inner wall of the gate valve body. A slider is slidably clamped inside the chute. A connecting block is fixedly arranged at the top of the slider. The top of the connecting block is fixedly connected to the outside of the plugging disc. A pressure relief assembly is arranged inside the plugging disc near the inlet end of the gate valve body. The slider drives the connecting block to move, and the connecting block drives the plugging disc to move and fit with the positioning ring, which can avoid the situation of easy leakage of single sealing. A sealing ring is fixedly arranged on one side of the plugging disc close to the positioning ring. The sealing performance between the plugging disc and the positioning ring is improved through the sealing ring. Symmetrically distributed flanges are fixedly arranged on the gate valve body. The gate valve body can be conveniently installed through the flanges.

[0006] Preferably, the pressure relief component includes a sealing plate. A groove is formed on one side of the sealing disc. A fixing plate is fixedly arranged on the inner wall of the groove. Symmetrically distributed guide rods are fixedly arranged on the side of the sealing plate close to the fixing plate. One end of the guide rod movably penetrates through one side of the fixing plate. A return spring is movably sleeved on the outer side of the guide rod. Two ends of the return spring are respectively fixedly connected with one side of the fixing plate and one side of the sealing plate. Pressure relief holes are formed on the side of the sealing disc away from the groove and are distributed in a rectangular array. The pressure relief holes communicate with the groove. When under pressure, the sealing plate moves. The guide rod moves on the fixing plate to keep the movement of the sealing plate stable. Water in the pipeline enters the valve body of the gate valve through the pressure relief holes. After the pipeline pressure decreases, the sealing plate resets to block the pressure relief holes, which can avoid the situation that the sealing structure of the gate valve is damaged due to excessive pipeline pressure. A sealing gasket is fixedly arranged on the side of the sealing plate away from the guide rod to improve the sealing performance of the sealing plate through the sealing gasket. A limiting disc is fixedly arranged at one end of the guide rod to limit the guide rod through the limiting disc.

[0007] Preferably, symmetrically distributed threaded rods are rotatably installed inside the sliding groove. One end of the threaded rod threadedly penetrates through the slider. The opposite ends of the threaded rods are fixedly provided with first bevel gears. A second bevel gear meshes between the two first bevel gears. The second bevel gear drives the first bevel gear to rotate. The first bevel gear drives the threaded rod to rotate. The threaded rod drives the slider to move. A transmission shaft movably penetrates through the top end of the valve body of the gate valve. One end of the transmission shaft is fixedly connected with one end of the second bevel gear. A runner is fixedly arranged at the top end of the transmission shaft. The runner drives the transmission shaft to rotate. The transmission shaft drives the second bevel gear to rotate.

[0008] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0009] 1. The second bevel gear drives the first bevel gear to rotate. The first bevel gear drives the threaded rod to rotate. The threaded rod drives the slider to move reversely in the sliding groove. The slider drives the connecting block to move. The connecting block drives the sealing disc to move and fit with the positioning ring, which can avoid the situation that single sealing is prone to leakage, thereby achieving the purpose of improving the sealing performance.

[0010] 2. When under pressure, the sealing plate moves. Water in the pipeline enters the valve body of the gate valve through the pressure relief holes. After the pipeline pressure decreases, the return spring drives the sealing plate to reset to block the pressure relief holes through the elastic force, which can avoid the situation that the sealing structure of the gate valve is damaged due to excessive pipeline pressure, thereby achieving the purpose of automatic pressure relief. Description of the Drawings

[0011] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0012] Figure 1 It is a schematic structural diagram of the present invention.

[0013] Figure 2 It is a schematic cross-sectional structural diagram of the present invention.

[0014] Figure 3 It is a schematic cross-sectional diagram of the plugging disc and its connection structure of the present invention.

[0015] In the figure: 1. Gate valve body; 2. Plugging assembly; 21. Plugging disc; 22. Slide groove; 23. Runner; 24. Slide block; 25. Connecting block; 26. Positioning ring; 27. Sealing ring; 28. Pressure relief assembly; 281. Plugging plate; 282. Fixed plate; 283. Guide rod; 284. Return spring; 285. Pressure relief hole; 286. Limiting disc; 287. Sealing gasket; 288. Groove; 29. Threaded rod; 210. First bevel gear; 211. Second bevel gear; 212. Transmission shaft; 3. Flange. Specific embodiments

[0016] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0017] Embodiment: As Figures 1-3As shown in the figure, the present utility model provides a pressure self-regulating double-sealed gate valve, which includes a gate valve body 1. A plugging assembly 2 is arranged inside the gate valve body 1. The plugging assembly 2 includes a plugging disc 21. The plugging discs 21 are symmetrically distributed and slidably clamped inside the gate valve body 1. Symmetrically distributed positioning rings 26 are fixedly arranged inside the gate valve body 1. One side of the positioning ring 26 is in contact with one side of the plugging disc 21. A chute 22 is opened on the inner wall of the gate valve body 1. A slider 24 is slidably clamped inside the chute 22. A connecting block 25 is fixedly arranged at the top of the slider 24. The top of the connecting block 25 is fixedly connected to the outside of the plugging disc 21. A pressure relief assembly 28 is arranged inside the plugging disc 21 near the inlet end of the gate valve body 1. By driving the connecting block 25 to move through the slider 24, the connecting block 25 drives the plugging disc 21 to move and fit with the positioning ring 26, which can avoid the leakage problem that is likely to occur in single sealing. A sealing ring 27 is fixedly arranged on one side of the plugging disc 21 close to the positioning ring 26. The sealing performance between the plugging disc 21 and the positioning ring 26 is improved through the sealing ring 27. Symmetrically distributed flanges 3 are fixedly arranged on the gate valve body 1. The gate valve body 1 can be conveniently installed through the flanges 3.

[0018] The pressure relief assembly 28 includes a plugging plate 281. A groove 288 is opened on one side of the plugging disc 21. A fixing plate 282 is fixedly arranged on the inner wall of the groove 288. Symmetrically distributed guide rods 283 are fixedly arranged on one side of the plugging plate 281 close to the fixing plate 282. One end of the guide rod 283 movably penetrates through one side of the fixing plate 282. A return spring 284 is movably sleeved on the outside of the guide rod 283. Two ends of the return spring 284 are respectively fixedly connected to one side of the fixing plate 282 and one side of the plugging plate 281. Pressure relief holes 285 distributed in a rectangular array are opened on one side of the plugging disc 21 far from the groove 288. The pressure relief holes 285 are communicated with the groove 288. When pressure is applied, the plugging plate 281 moves. The movement of the plugging plate 281 is kept stable by the movement of the guide rod 283 on the fixing plate 282. Water in the pipeline enters the gate valve body 1 from the pressure relief holes 285. After the pipeline pressure drops, the plugging plate 281 resets to plug the pressure relief holes 285, which can avoid the damage of the gate valve plugging structure caused by excessive pipeline pressure. A sealing pad 287 is fixedly arranged on one side of the plugging plate 281 far from the guide rod 283. The sealing performance of the plugging plate 281 is improved through the sealing pad 287. A limit disc 286 is fixedly arranged at one end of the guide rod 283. The guide rod 283 can be limited through the limit disc 286.

[0019] Inside the chute 22, symmetrically distributed threaded rods 29 are rotatably installed. One end of the threaded rod 29 threadedly penetrates through the slider 24. Opposite ends of the threaded rod 29 are fixedly provided with first bevel gears 210. A second bevel gear 211 meshes between the two first bevel gears 210. The second bevel gear 211 drives the first bevel gear 210 to rotate. The first bevel gear 210 drives the threaded rod 29 to rotate. The threaded rod 29 drives the slider 24 to move. The top end of the gate valve body 1 is movably penetrated by a transmission shaft 212. One end of the transmission shaft 212 is fixedly connected to one end of the second bevel gear 211. The top end of the transmission shaft 212 is fixedly provided with a runner 23. The runner 23 drives the transmission shaft 212 to rotate. The transmission shaft 212 drives the second bevel gear 211 to rotate.

[0020] Working principle: First, when it is necessary to close the valve, rotate the runner 23. The runner 23 drives the transmission shaft 212 to rotate. The transmission shaft 212 drives the second bevel gear 211 to rotate. The second bevel gear 211 drives the first bevel gear 210 to rotate. The first bevel gear 210 drives the threaded rod 29 to rotate. The threaded rod 29 drives the slider 24 to move reversely in the chute 22. The slider 24 drives the connecting block 25 to move. The connecting block 25 drives the plugging disc 21 to move and fit with the positioning ring 26, and the sealing ring 27 is used to improve the sealing performance between the plugging disc 21 and the positioning ring 26. In this way, it is possible to avoid the situation that single sealing is prone to leakage, so as to achieve the purpose of improving the sealing performance. When the pipeline pressure is too high, the pressure causes the plugging plate 281 to move. The guide rod 283 moves on the fixed plate 282 to keep the movement of the plugging plate 281 stable. At the same time, the plugging plate 281 compresses the return spring 284, causing the return spring 284 to generate elastic force. The water in the pipeline enters the gate valve body 1 from the pressure relief hole 285. After the pipeline pressure drops, the return spring 284 drives the plugging plate 281 to reset to block the pressure relief hole 285, and the sealing gasket 287 is used to improve the sealing performance of the plugging plate 281. In this way, it is possible to avoid the situation that the gate valve plugging structure is damaged due to excessive pipeline pressure, so as to achieve the purpose of automatic pressure relief.

[0021] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention is also intended to include these changes and modifications.

Claims

1. A pressure self-regulating double-sealed gate valve, comprising a gate valve body (1), characterized in that: A plugging assembly (2) is arranged inside the gate valve body (1), and the plugging assembly (2) includes a plugging disk (21). The plugging disk (21) is symmetrically distributed and slidably clamped in the gate valve body (1). A symmetrically distributed positioning ring (26) is fixedly arranged inside the gate valve body (1), and one side of the positioning ring (26) is in contact with one side of the plugging disk (21). A sliding groove (22) is provided on the inner wall of the gate valve body (1), and a sliding block (24) is slidably clamped inside the sliding groove (22). A connecting block (25) is fixedly arranged at the top end of the sliding block (25), and the top end of the connecting block (25) is fixedly connected to the outer side of the plugging disk (21). A pressure relief assembly (28) is arranged in the plugging disk (21) near the entrance end of the gate valve body (1).

2. A pressure self-regulating double-sealed gate valve as claimed in claim 1, characterized in that: The pressure relief assembly (28) comprises a blocking plate (281), a groove (288) is provided on one side of the blocking plate (21), a fixing plate (282) is fixedly provided on the inner wall of the groove (288), a symmetrically distributed guide rod (283) is fixedly provided on the side of the blocking plate (281) close to the fixing plate (282), one end of the guide rod (283) movably passes through one side of the fixing plate (282), a return spring (284) is movably sleeved on the outer side of the guide rod (283), two ends of the return spring (284) are respectively fixedly connected to one side of the fixing plate (282) and one side of the blocking plate (281), and a pressure relief hole (285) distributed in a rectangular array is provided on the side of the blocking plate (21) away from the groove (288), and the pressure relief hole (285) is connected to the groove (288).

3. A pressure self-regulating double-sealed gate valve as claimed in claim 1, characterized in that: A symmetrically distributed threaded rod (29) is rotatably mounted inside the slide groove (22), one end of the threaded rod (29) is threadedly penetrated through the slider (24), a first bevel gear (210) is fixedly mounted at the opposite end of the threaded rod (29), and a second bevel gear (211) is meshed between the two first bevel gears (210).

4. A pressure self-regulating double-sealed gate valve as claimed in claim 2, characterized in that: A sealing gasket (287) is fixedly provided on one side of the blocking plate (281) away from the guide rod (283).

5. A pressure self-regulating double-sealed gate valve as claimed in claim 2, characterized in that: A limiting plate (286) is fixedly provided at one end of the guide rod (283).

6. A pressure self-regulating double-sealed gate valve as claimed in claim 3, characterized in that: A transmission shaft (212) movably penetrates the top end of the gate valve body (1); one end of the transmission shaft (212) is fixedly connected to one end of the second bevel gear (211); and a rotating wheel (23) is fixedly provided at the top end of the transmission shaft (212).

7. A pressure self-regulating double-sealed gate valve as claimed in claim 1, characterized in that: A sealing ring (27) is fixedly provided on one side of the sealing disk (21) close to the positioning ring (26).

8. A pressure self-regulating double-sealed gate valve as claimed in claim 1, characterized in that: The gate valve body (1) is fixedly provided with symmetrically distributed flanges (3).

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