Automatic pressure relief control system for gate valve and gate valve

Abstract

The invention discloses a gate valve automatic pressure relief control system and a gate valve, and belongs to the technical field of valve safety control systems.The gate valve automatic pressure relief control system comprises a valve assembly which comprises a valve body and a valve element, the valve element is installed in the valve body, and a pressure relief hole is formed in the valve element; the pressure relief assembly comprises a sealing column, a pressure bearing piece and a driving piece, the sealing column is arranged in the valve element in a sliding mode, the driving piece and the pressure bearing piece are both installed on the valve element, one end of the driving piece is connected with the sealing column and applies acting force for blocking the pressure relief hole to the sealing column, and one end of the pressure bearing piece bears fluid pressure of the inflow end of the valve element; the pressure sensor is used for monitoring the fluid pressure of the inflow end of the gate valve, once the fluid pressure exceeds the set safety pressure, hydraulic oil in the hydraulic pipe is discharged through the hydraulic system, the pressure bearing piece drives the sealing column to slide under the action of the fluid pressure, the flow guide hole communicates with the pressure relief hole, and automatic pressure relief is achieved.

Description

Technical Field

[0001] The invention discloses a gate valve automatic pressure relief control system and a gate valve, belonging to the technical field of valve safety control systems. Background Art

[0002] The gate valve's opening and closing parts are the gate disc, and the direction of movement of the gate disc is perpendicular to the direction of the fluid. Currently, the gate valve can only be fully opened or fully closed, and cannot be used for pressure regulation and throttling. The gate disc has two sealing surfaces. The two sealing surfaces of the most commonly used gate disc valve form a wedge shape, and the wedge angle varies with the valve parameters. When the fluid pressure on one side of the gate disc is too high when the existing gate valve is closed, it cannot automatically release pressure according to the set initial pressure, resulting in certain safety hazards in the actual use of the valve. Summary of the invention

[0003] The purpose of the present invention is to solve the problems in the prior art and to provide a gate valve automatic pressure relief control system and a gate valve.

[0004] The present invention achieves the above-mentioned purpose through the following technical solutions. A gate valve comprises: A valve assembly comprises a valve body and a valve core, wherein the valve core is installed in the valve body and a pressure relief hole is arranged on the valve core; A pressure relief assembly, comprising a sealing column, a pressure bearing member and a driving member, wherein the sealing column is slidably arranged in the valve core, the driving member and the pressure bearing member are both installed on the valve core, one end of the driving member is connected to the sealing column, and exerts a force to block the pressure relief hole on the sealing column, one end of the pressure bearing member bears the fluid pressure at the inflow end of the valve core, and when the pressure bearing member slides, the driving member and the sealing column are driven to slide, so that the guide hole is connected with the pressure relief hole to achieve pressure relief; A control unit includes a pressure sensor, a limiter and a hydraulic system, wherein the hydraulic system includes a hydraulic pipe, a first electrically controlled valve and a second electrically controlled valve, wherein the limiter is slidably arranged in the hydraulic pipe, and one end of the limiter extends to the bottom of the driving member, wherein the pressure sensor is mounted on the valve body and is used to detect the fluid pressure P1 at the inflow end of the valve core in real time, and when the gate valve is closed, when the real-time fluid pressure P1 ≥ the initially set fluid pressure P2, the pressure sensor controls the electrical signal of the second electrically controlled valve to open, so that the hydraulic oil in the hydraulic pipe flows out to reduce the pressure, and the limiter releases the limit on the driving member and the sealing column to allow the gate valve to start to relieve pressure.

[0005] Preferably, the driving member includes a first wedge block, a first connecting rod and a first spring, a first slide groove is provided at the bottom of the valve core, the first wedge block is slidably set in the first slide groove, one end of the first connecting rod is fixedly connected to the first wedge block, and the other end is fixedly connected to the sealing column by a bolt, the first spring is sleeved on the outside of the first connecting rod, and the first spring applies an upward force to the sealing column.

[0006] Preferably, the pressure-bearing member includes a second connecting rod, a second wedge block and a second spring, one end of the second connecting rod is slidably arranged on the valve core, and the other end is fixedly connected to the second wedge block, and the first wedge block and the second wedge block have mutually matching wedge surfaces.

[0007] Preferably, the limit member includes a piston rod and a third spring, one end of the piston rod is slidably arranged in the hydraulic pipe, and the other end extends into the valve body, and the third spring is sleeved on the outside of the piston rod and applies a force to the piston rod away from the first wedge block.

[0008] Preferably, seals are provided at the connection between the first connecting rod and the second connecting rod and the valve core, and at the connection between the piston rod and the hydraulic pipe. The seals include a pressing plate and a sealing ring. The pressing plate applies pressure to the sealing ring after being subjected to the force of the spring.

[0009] Preferably, the sealing column is provided with a limiting surface for limiting its rotational freedom, and valve seats are provided on both sides of the valve body corresponding to the valve core.

[0010] A gate valve automatic pressure relief control system, comprising: When the gate valve is closed and not in the pressure relief state, the maximum initial fluid pressure that the gate valve core can withstand is set to P2, and the hydraulic oil pressure in the hydraulic pipe is set to P3; The pressure sensor obtains the fluid pressure P1 at the inflow end of the valve core in real time, and transmits the value of the fluid pressure P1 to the data processor; The comparison module in the data processor compares the acquired real-time fluid pressure P1 with the value of the initial set pressure P2; When P1<P2, the second electric control valve is in the closed state, and the first electric control valve is closed after the hydraulic oil pressure in the hydraulic pipe is ≥P3; When P1≥P2, the data processor sends an electrical signal to control the operation of the hydraulic system. After receiving the working signal, the hydraulic system controls the second electronically controlled valve to open, so that the hydraulic oil in the hydraulic pipe flows out to reduce the pressure, and relies on the pressure relief component to allow the gate valve to start pressure relief.

[0011] Compared with the prior art, the present invention has the following beneficial effects: By setting a pressure relief component and a control unit, a pressure sensor is used to monitor the fluid pressure at the inlet end of the gate valve. Once the fluid pressure exceeds the initially set pressure, the hydraulic system discharges the hydraulic oil in the hydraulic pipe, and the pressure-bearing part drives the sealing column to slide under the action of the fluid pressure, so that the guide hole and the pressure relief hole are connected to achieve automatic pressure relief, so that the fluid pressure of the pipeline is maintained within a safe range. The initial fluid pressure P2 can be set as needed, and when automatic pressure relief is not required, the hydraulic system is used to keep the hydraulic oil in the hydraulic pipe within a certain pressure range, so that the guide hole and the pressure relief hole on the sealing column remain in a staggered state, so that even if the fluid pressure increases to exceed P2, automatic pressure relief will not occur, thus achieving a dual-purpose effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of a gate valve automatic pressure relief control system of the present invention; Figure 2 It is a structural schematic diagram of a gate valve with an automatic pressure relief control system of the present invention; Figure 3 It is a partial cross-sectional view of the gate valve in the present invention; Figure 4 It is a schematic diagram of the structure of the valve core, the driving member and the pressure-bearing member in the present invention; Figure 5 for Figure 3 A partial enlarged view of the middle A; Figure 6 It is a schematic diagram of the structure of the driving member and the pressure-bearing member in the present invention; : Illustrations: 1. valve body; 2. hydraulic system; 3. valve seat; 4. valve core; 5. pressure sensor; 6. drive member; 7. pressure relief hole; 8. pressure-bearing member; 9. first electrically-controlled valve; 10. limit member; 11. hydraulic pipe; 12. second electrically-controlled valve; 13. sealing column; 14. guide hole; 15. first connecting rod; 16. first spring; 17. pressing plate; 18. sealing ring; 19. first wedge block; 20. third spring; 21. piston rod; 22. second spring; 23. second connecting rod; 24. second wedge block; 25. limit surface; 26. wedge surface. DETAILED DESCRIPTION

[0013] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0014] like Figure 1-Figure 6 As shown, a gate valve comprises: The valve assembly comprises a valve body 1 and a valve core 4, wherein the valve core 4 is installed in the valve body 1 and a pressure relief hole 7 is provided on the valve core 4; A pressure relief assembly, comprising a sealing column 13, a pressure bearing member 8 and a driving member 6. The sealing column 13 is slidably arranged in the valve core 4. The driving member 6 and the pressure bearing member 8 are both installed on the valve core 4. One end of the driving member 6 is connected to the sealing column 13, and applies a force to block the pressure relief hole 7 to the sealing column 13. One end of the pressure bearing member 8 bears the fluid pressure at the inflow end of the valve core 4, and drives the driving member 6 and the sealing column 13 to slide when the pressure bearing member 8 slides, so that the guide hole 14 is connected to the pressure relief hole 7 to achieve pressure relief; A control unit includes a pressure sensor 5, a limit member 10 and a hydraulic system 2. The hydraulic system 2 includes a hydraulic pipe 11, a first electrically controlled valve 9 and a second electrically controlled valve 12. The limit member 10 is slidably arranged in the hydraulic pipe 11, and one end of the limit member 10 extends to the bottom of the driving member 6. The pressure sensor 5 is installed on the valve body 1 and is used to detect the fluid pressure P1 at the inflow end of the valve core 4 in real time. When the gate valve is closed, when the real-time fluid pressure P1 ≥ the initially set fluid pressure P2, the pressure sensor 5 controls the electrical signal of the second electrically controlled valve 12 to open, so that the hydraulic oil in the hydraulic pipe 11 flows out to achieve pressure reduction, and the limit member 10 releases the limit on the driving member 6 and the sealing column 13 to allow the gate valve to start depressurizing.

[0015] The driving member 6 includes a first wedge block 19, a first connecting rod 15 and a first spring 16. A first slide groove is provided at the bottom of the valve core 4. The first wedge block 19 is slidably arranged in the first slide groove. One end of the first connecting rod 15 is fixedly connected to the first wedge block 19, and the other end is fixedly connected to the sealing column 13 by a bolt. The first spring 16 is sleeved on the outside of the first connecting rod 15, and the first spring 16 applies an upward force to the sealing column 13. The pressure-bearing member 8 includes a second connecting rod 23, a second wedge block 24 and a second spring 22. The second connecting rod 2 One end of the first wedge block 19 is slidably arranged on the valve core 4, and the other end is fixedly connected to the second wedge block 24. There are wedge surfaces 26 that cooperate with each other between the first wedge block 19 and the second wedge block 24. When the second connecting rod 23 is subjected to the pressure of the fluid, it can drive the second wedge block 24 to slide horizontally, and rely on the cooperation of the wedge surface 26 to force the second wedge block 24 to slide downward. In this way, the sealing column 13 is driven by the first connecting rod 15 to slide downward synchronously, so that the guide hole 14 is connected with the pressure relief hole 7, so that the fluid can be depressurized through the pressure relief hole 7.

[0016] The limit member 10 includes a piston rod 21 and a third spring 20. One end of the piston rod 21 is slidably arranged in the hydraulic pipe 11, and the other end extends into the valve body 1. The third spring 20 is sleeved on the outer side of the piston rod 21 and applies a force to the piston rod 21 away from the first wedge block 19. The hydraulic system 2 can adjust the interference state between the piston rod 21 and the first wedge block 19 by introducing hydraulic oil into the hydraulic pipe 11 and acting together with the elastic force of the third spring 20 on the piston rod 21, thereby realizing automatic pressure relief of the gate valve.

[0017] The connection between the first connecting rod 15 and the second connecting rod 23 and the valve core 4, and the connection between the piston rod 21 and the hydraulic pipe 11 are all provided with seals, which include a pressing plate 17 and a sealing ring 18. The pressing plate 17 exerts pressure on the sealing ring 18 after being subjected to the force of the spring. Such a design can ensure the sealing of the first connecting rod 15, the second connecting rod 23 and the piston rod 21 when sliding.

[0018] The sealing column 13 is provided with a limiting surface 25 for limiting its rotational freedom. Valve seats 3 are provided on both sides of the valve body 1 corresponding to the valve core 4. The limiting surface 25 can prevent the sealing column 13 from rotating, thereby ensuring the accuracy of the installation position of the guide hole 14 and the pressure relief hole 7 to avoid the situation where the two cannot be connected. The valve seat 3 can prevent the valve core 4 from rubbing against the valve body 1.

[0019] Specific working principle: After the gate valve is closed, when it is not necessary to relieve the pressure of the gate valve, the first electric control valve 9 is opened, and the hydraulic oil is delivered to the hydraulic pipe 11 by the external hydraulic pump, so that the hydraulic pipe 11 is pressurized, and the piston rod 21 is pushed upward by the hydraulic oil to compress the third spring 20 until one end of the piston rod 21 contacts the first wedge block 19. At this time, even if the fluid pressure at the inflow end of the valve core 4 increases to more than P2, the fluid cannot pass through the pressure relief hole 7. When the fluid pressure in the pipeline needs to be kept within a safe range, the gate valve needs to have an automatic pressure relief function. At this time, the pressure The sensor 5 controls the second electric control valve 12 to open, so that the hydraulic oil in the hydraulic pipe 11 is discharged, so that the third spring 20 drives the piston rod 21 away from the first wedge block 19. At the same time, the second connecting rod 23 begins to compress the second spring 22 under the action of fluid pressure, and drives the second wedge block 24 to move. Relying on the wedge surface 26 between the second wedge block 24 and the first wedge block 19, the first wedge block 19 moves downward and synchronously drives the sealing column 13 to slide, so that the guide hole 14 can be connected with the pressure relief hole 7, so that the fluid can pass through the pressure relief hole 7 to achieve automatic pressure relief.

[0020] like Figure 1-Figure 6 As shown, a gate valve automatic pressure relief control system comprises: When the gate valve is closed and not in a pressure relief state, the maximum initial fluid pressure that the gate valve core 4 can withstand at the inlet end is set to P2, and the hydraulic oil pressure in the hydraulic pipe is set to P3; The pressure sensor 5 obtains the fluid pressure P1 at the inflow end of the valve core 4 in real time, and transmits the value of the fluid pressure P1 to the data processor; The comparison module in the data processor compares the acquired real-time fluid pressure P1 with the value of the initial set pressure P2; When P1<P2, the second electrically controlled valve 12 is in a closed state, and the first electrically controlled valve 9 is closed after the hydraulic oil pressure in the hydraulic pipe 11 is ≥P3; When P1≥P2, the data processor sends an electrical signal to control the operation of the hydraulic system 2. After receiving the working signal, the hydraulic system 2 controls the second electronically controlled valve 12 to open, so that the hydraulic oil in the hydraulic pipe 11 flows out to reduce the pressure, and relies on the pressure relief component to allow the gate valve to start pressure relief.

[0021] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0022] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A gate valve, characterized in that: include: A valve assembly, comprising a valve body (1) and a valve core (4), wherein the valve core (4) is installed in the valve body (1), and a pressure relief hole (7) is provided on the valve core (4); A pressure relief assembly, comprising a sealing column (13), a pressure-bearing member (8) and a driving member (6), wherein the sealing column (13) is slidably arranged in a valve core (4), the driving member (6) and the pressure-bearing member (8) are both mounted on the valve core (4), one end of the driving member (6) is connected to the sealing column (13), and applies a force to the sealing column (13) to block the pressure relief hole (7), one end of the pressure-bearing member (8) bears the fluid pressure at the inflow end of the valve core (4), and when the pressure-bearing member (8) slides, the driving member (6) and the sealing column (13) are driven to slide, so that the guide hole (14) is connected to the pressure relief hole (7) to achieve pressure relief; A control unit comprises a pressure sensor (5), a limiter (10) and a hydraulic system (2), wherein the hydraulic system (2) comprises a hydraulic pipe (11), a first electrically controlled valve (9) and a second electrically controlled valve (12), wherein the limiter (10) is slidably arranged in the hydraulic pipe (11), and one end of the limiter (10) extends below the driving member (6), wherein the pressure sensor (5) is mounted on the valve body (1) and is used to detect the fluid pressure P1 at the inflow end of the valve core (4) in real time, and when the gate valve is closed, when the real-time fluid pressure P1 is greater than or equal to the initially set fluid pressure P2, the pressure sensor (5) controls the electric signal of the second electrically controlled valve (12) to open, so that the hydraulic oil in the hydraulic pipe (11) flows out to reduce the pressure, and the limiter (10) releases the limit on the driving member (6) and the sealing column (13), so that the gate valve starts to release the pressure.

2. A gate valve according to claim 1, characterized in that: The driving member (6) comprises a first wedge block (19), a first connecting rod (15) and a first spring (16); a first slide groove is provided at the bottom of the valve core (4); the first wedge block (19) is slidably arranged in the first slide groove; one end of the first connecting rod (15) is fixedly connected to the first wedge block (19); the other end of the first connecting rod (15) is fixedly connected to the sealing column (13) via a bolt; the first spring (16) is sleeved on the outside of the first connecting rod (15), and the first spring (16) applies an upward force to the sealing column (13).

3. A gate valve according to claim 2, characterized in that: The pressure-bearing member (8) comprises a second connecting rod (23), a second wedge block (24) and a second spring (22); one end of the second connecting rod (23) is slidably disposed on the valve core (4), and the other end is fixedly connected to the second wedge block (24); and the first wedge block (19) and the second wedge block (24) have mutually matching wedge surfaces (26).

4. A gate valve according to claim 3, characterized in that: The stopper (10) comprises a piston rod (21) and a third spring (20); one end of the piston rod (21) is slidably disposed in the hydraulic pipe (11), and the other end extends into the valve body (1); the third spring (20) is sleeved on the outside of the piston rod (21) and applies a force to the piston rod (21) to move away from the first wedge block (19).

5. A gate valve according to claim 3, characterized in that: The connection between the first connecting rod (15) and the second connecting rod (23) and the valve core (4), and the connection between the piston rod (21) and the hydraulic pipe (11) are both provided with sealing members, the sealing members comprising a pressing plate (17) and a sealing ring (18), the pressing plate (17) exerting pressure on the sealing ring (18) after receiving the action of a spring.

6. A gate valve according to claim 1, characterized in that: The sealing column (13) is provided with a limiting surface (25) for limiting its rotational freedom, and valve seats (3) are provided on both sides of the valve body (1) corresponding to the valve core (4).

7. A gate valve automatic pressure relief system, applied to the gate valve according to any one of claims 1 to 6, characterized in that: include: When the gate valve is closed and not in a pressure relief state, the maximum initial fluid pressure that the gate valve core (4) can withstand at the inlet end is set to P2, and the hydraulic oil pressure in the hydraulic pipe is set to P3; The pressure sensor (5) acquires the fluid pressure P1 at the inflow end of the valve core (4) in real time, and transmits the value of the fluid pressure P1 to the data processor; The comparison module in the data processor compares the acquired real-time fluid pressure P1 with the value of the initial set pressure P2; When P1<P2, the second electrically controlled valve (12) is in a closed state, and the first electrically controlled valve (9) is closed after the pressure of the hydraulic oil in the hydraulic pipe (11) is ≥P3; When P1≥P2, the data processor sends an electrical signal to control the operation of the hydraulic system (2). After receiving the operation signal, the hydraulic system (2) controls the second electrically controlled valve (12) to open, so that the hydraulic oil in the hydraulic pipe (11) flows out to reduce the pressure, and the gate valve starts to release the pressure by relying on the pressure relief component.

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