An automatic pressure relief control system for a gate valve and a gate valve

Abstract

The present invention discloses an automatic pressure relief control system for a gate valve and a gate valve, belonging to the technical field of valve safety control systems. It includes a valve assembly, which includes a valve body and a valve core. The valve core is installed in the valve body, and a pressure relief hole is provided on the valve core; a pressure relief assembly, which includes a sealing column, a pressure-bearing member and a driving member. The sealing column is slidably arranged in the valve core, and both the driving member and the pressure-bearing member are installed on the valve core. One end of the driving member is connected to the sealing column and applies a force to block the pressure relief hole to the sealing column. One end of the pressure-bearing member bears the fluid pressure at the inflow end of the valve core. The present invention uses a pressure sensor to monitor the fluid pressure at the inflow end of the gate valve. Once the fluid pressure exceeds the set safety pressure, the hydraulic oil in the hydraulic pipe is discharged by the hydraulic system, and the pressure-bearing member drives the sealing column to slide under the action of the fluid pressure, so that the diversion hole is communicated with the pressure relief hole to achieve automatic pressure relief.

Description

Technical Field

[0001] The present 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 Technique

[0002] The opening and closing member of a gate valve is a gate plate, and the moving direction of the gate plate is perpendicular to the fluid direction. Currently, a gate valve can only be fully opened and fully closed, and cannot perform pressure regulation and throttling. The gate plate has two sealing surfaces, and in the most common mode, the two sealing surfaces of the gate plate valve form a wedge shape, and the wedge angle varies with the valve parameters. In the case of the existing gate valve being closed, when the fluid pressure on one side of the gate plate is too high, it cannot automatically relieve pressure according to the set initial pressure, resulting in certain safety hazards during 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 provide a gate valve automatic pressure relief control system and a gate valve.

[0004] The present invention realizes the above purpose through the following technical solutions. A gate valve includes:

[0005] A valve assembly, which includes a valve body and a valve core. The valve core is installed in the valve body, and a pressure relief hole is provided on the valve core.

[0006] A pressure relief assembly, which includes a sealing column, a pressure-bearing member, and a driving member. 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 applies a force to block the pressure relief hole to 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, it drives the driving member and the sealing column to slide, so that the diversion hole is communicated with the pressure relief hole to achieve pressure relief.

[0007] A control unit, which includes a pressure sensor, a limiting member, and a hydraulic system. The hydraulic system includes a hydraulic pipe, a first electric control valve, and a second electric control valve. The limiting member is slidably arranged in the hydraulic pipe, and one end of the limiting member extends below the driving member. The pressure sensor is installed on the valve body and is used to detect the fluid pressure P1 at the inflow end of the valve core in real time. When the gate valve is closed and the real-time fluid pressure P1 ≥ the initially set fluid pressure P2, the pressure sensor controls the second electric control valve to open an electric signal, so that the hydraulic oil in the hydraulic pipe flows out to achieve pressure reduction, and the limiting member releases the limit on the driving member and the sealing column, and the gate valve starts to relieve pressure.

[0008] Preferably, the driving member includes a first wedge block, a first connecting rod, and a first spring. A first sliding groove is provided at the bottom of the valve core. The first wedge block is slidably disposed in the first sliding 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 outside the first connecting rod, and the first spring applies an upward force to the sealing column.

[0009] 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 disposed on the valve core, and the other end is fixedly connected to the second wedge block. There are mutually cooperating wedge surfaces between the first wedge block and the second wedge block.

[0010] Preferably, the limiting member includes a piston rod and a third spring. One end of the piston rod is slidably disposed in the hydraulic pipe, and the other end extends into the valve body. The third spring is sleeved outside the piston rod and applies a force to the piston rod away from the first wedge block.

[0011] Preferably, sealing members are provided at the joints of the first connecting rod and the second connecting rod with the valve core, and at the joint of the piston rod and the hydraulic pipe. The sealing members include pressing pieces and sealing rings. After the pressing pieces bear the force of the springs, they apply pressure to the sealing rings.

[0012] Preferably, a limiting surface for restricting the rotational freedom is provided on the sealing column, and valve seats are provided on both sides of the valve body corresponding to the valve core.

[0013] A gate valve automatic pressure relief control system includes:

[0014] When the gate valve is closed and not in the pressure relief state, the maximum initial fluid pressure that the inflow end of the gate valve core can withstand is set as P2, and the hydraulic oil pressure in the hydraulic pipe is P3;

[0015] 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;

[0016] The comparison module in the data processor compares the obtained real-time fluid pressure P1 with the value of the initial set pressure P2;

[0017] When P1 < P2, the second electric control valve is in the closed state, and the first electric control valve closes after the hydraulic oil pressure in the hydraulic pipe ≥ P3;

[0018] When P1 ≥ P2, the data processor issues an electrical signal for controlling the operation of the hydraulic system. After the hydraulic system receives the operation signal, it controls the second electric control valve to open, so that the hydraulic oil in the hydraulic pipe flows out to achieve pressure reduction, and the gate valve starts to relieve pressure by relying on the pressure relief component.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] By providing a pressure relief component and a control unit, the fluid pressure at the inflow end of the gate valve is monitored using a pressure sensor. Once the fluid pressure exceeds the initially set pressure, the hydraulic oil in the hydraulic pipe is discharged by the hydraulic system, and under the action of the fluid pressure, the pressure-bearing member drives the sealing column to slide, enabling the communication between the diversion hole and the pressure relief hole to achieve automatic pressure relief, thereby maintaining the fluid pressure in the pipeline within a safe range. The initial fluid pressure P2 can be set as needed. When automatic pressure relief is not required, the hydraulic oil in the hydraulic pipe is maintained within a certain pressure range by the hydraulic system, causing the diversion hole on the sealing column to be misaligned with the pressure relief hole. Thus, even if the fluid pressure increases beyond P2, automatic pressure relief will not occur, achieving a dual-purpose effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic diagram of the automatic pressure relief control system of a gate valve according to the present invention;

[0022] Figure 2 is a structural schematic diagram of a gate valve with an automatic pressure relief control system according to the present invention;

[0023] Figure 3 is a partial cross-sectional view of the gate valve according to the present invention;

[0024] Figure 4 is a structural schematic diagram of the valve core, driving member, and pressure-bearing member according to the present invention;

[0025] Figure 5 is Figure 3 a partial enlarged view of part A in

[0026] Figure 6 is a structural schematic diagram of the driving member and the pressure-bearing member according to the present invention;

[0027] Reference numerals: 1, valve body; 2, hydraulic system; 3, valve seat; 4, valve core; 5, pressure sensor; 6, driving member; 7, pressure relief hole; 8, pressure-bearing member; 9, first electric control valve; 10, limiting member; 11, hydraulic pipe; 12, second electric control valve; 13, sealing column; 14, diversion hole; 15, first connecting rod; 16, first spring; 17, pressing piece; 18, sealing ring; 19, first wedge-shaped block; 20, third spring; 21, piston rod; 22, second spring; 23, second connecting rod; 24, second wedge-shaped block; 25, limiting surface; 26, wedge-shaped surface. DETAILED DESCRIPTION OF THE INVENTION

[0028] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0029] As Figures 1-6 shown, a gate valve includes:

[0030] A valve assembly, which includes a valve body 1 and a valve core 4. The valve core 4 is installed in the valve body 1, and a pressure relief hole 7 is provided on the valve core 4;

[0031] A pressure relief assembly, which includes 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. Both the driving member 6 and the pressure-bearing member 8 are 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 when the pressure-bearing member 8 slides, it drives the driving member 6 and the sealing column 13 to slide, so that the diversion hole 14 is communicated with the pressure relief hole 7 to realize pressure relief;

[0032] A control unit, which includes a pressure sensor 5, a limiting member 10 and a hydraulic system 2. The hydraulic system 2 includes a hydraulic pipe 11, a first electric control valve 9 and a second electric control valve 12. The limiting member 10 is slidably arranged in the hydraulic pipe 11, and one end of the limiting member 10 extends below 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 second electric control valve 12 to open an electric signal, so that the hydraulic oil in the hydraulic pipe 11 flows out to realize pressure reduction, and the limiting member 10 releases the limit on the driving member 6 and the sealing column 13 to allow the gate valve to start pressure relief.

[0033] The driving member 6 includes a first wedge block 19, a first connecting rod 15 and a first spring 16. A first sliding groove is provided at the bottom of the valve core 4. The first wedge block 19 is slidably arranged in the first sliding 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 outside the first connecting rod 15, and the first spring 16 exerts an upward acting force on 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. One end of the second connecting rod 23 is slidably arranged on the valve core 4, and the other end is fixedly connected to the second wedge block 24. There is a mutually cooperating wedge surface 26 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, relying on the first connecting rod 15 to drive the sealing column 13 to slide downward synchronously, so that the diversion hole 14 is communicated with the pressure relief hole 7, and thus the fluid can be relieved through the pressure relief hole 7.

[0034] The limiting 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 outside the piston rod 21 and exerts a force on the piston rod 21 to move away from the first wedge block 19. The hydraulic system 2 can adjust the contact 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, so as to realize the automatic pressure relief of the gate valve.

[0035] Sealing members are provided at the joints of the first connecting rod 15 and the second connecting rod 23 with the valve core 4 and at the joint of the piston rod 21 with the hydraulic pipe 11. The sealing member includes a pressing piece 17 and a sealing ring 18. After the pressing piece 17 bears the acting force of the spring, it exerts pressure on the sealing ring 18. Such a design can ensure the sealing performance when the first connecting rod 15, the second connecting rod 23 and the piston rod 21 slide.

[0036] A limiting surface 25 for restricting the rotational freedom is provided on the sealing column 13. 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, so as to ensure the accuracy of the installation positions of the diversion hole 14 and the pressure relief hole 7 and avoid the situation that the two cannot be communicated. The valve seat 3 can prevent the valve core 4 from rubbing against the valve body 1.

[0037] Specific working principle: After the gate valve is closed, when there is no need to relieve the pressure of the gate valve, the first electromagnetic valve 9 is opened, and the hydraulic oil is transported into the hydraulic pipe 11 by an 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 abuts against the first wedge block 19. At this time, even if the fluid pressure at the inflow end on one side of the valve core 4 increases and exceeds P2, the fluid cannot pass through the pressure relief hole 7. When it is necessary to keep the fluid pressure in the pipeline within a safe range, the gate valve needs to have an automatic pressure relief function. At this time, the pressure sensor 5 controls the second electromagnetic 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 starts to compress the second spring 22 under the action of the 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 diversion hole 14 is communicated with the pressure relief hole 7, so that the fluid can pass through the pressure relief hole 7 to realize automatic pressure relief.

[0038] As Figures 1-6 shown, an automatic pressure relief control system for a gate valve includes:

[0039] When the gate valve is closed and not in the pressure relief state, the maximum initial fluid pressure that the inflow end of the gate valve core 4 can withstand is set as P2, and the hydraulic oil pressure in the hydraulic pipe is P3;

[0040] 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;

[0041] The comparison module in the data processor compares the obtained real-time fluid pressure P1 with the value of the initially set pressure P2;

[0042] When P1 < P2, the second electromagnetic valve 12 is in the closed state, and the first electromagnetic valve 9 closes after the hydraulic oil pressure in the hydraulic pipe 11 ≥ P3;

[0043] 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 electromagnetic valve 12 to open, so that the hydraulic oil in the hydraulic pipe 11 flows out to realize pressure reduction, and the gate valve starts to relieve pressure by relying on the pressure relief component.

[0044] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention. Any reference signs in the claims should not be construed as limiting the claims involved.

[0045] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative manner of the specification is only for clarity. Those skilled in the art should regard 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 gate valve automatic pressure relief control system, 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, comprising 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), and the pressure sensor (5) is mounted on the valve body (1) and is used to detect the real-time fluid pressure P1 at the inflow end of the valve core (4). When the gate valve is closed, when the real-time fluid pressure P1 ≥ the initially set fluid pressure P2, the pressure sensor (5) sends an electrical signal to control the first electrically controlled valve (9) to close and 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 limiting member (10) releases the limiting of the driving member (6) and the sealing column (13) to allow the gate valve to start to release the pressure, the driving member (6) includes a first wedge block (19), a first connecting rod (15) and a first spring (16), the bottom of the valve core (4) is provided with a first slide groove, the first wedge block ( 19) is slidably disposed 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), 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); the first wedge block (19) and the second wedge block (24) have mutually matching wedge surfaces (26); the limit member (10) comprises 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 outside of the piston rod (21) and applies a force to the piston rod (21) to move away from the first wedge block (19).

2. The gate valve automatic pressure relief control system according to claim 1, 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.

3. The gate valve automatic pressure relief control system 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).

4. A gate valve, characterized in that: It comprises the gate valve automatic pressure relief control system as described in any one of claims 1 to 3.

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