Electro-hydraulic actuating mechanism of emergency cut-off valve

Abstract

The utility model discloses an emergency cut-off valve electro-hydraulic actuating mechanism which comprises a pump, a first one-way valve, a two-position three-way normally-open electromagnetic reversing valve and a manual three-position four-way reversing valve which are sequentially communicated through a liquid path from an oil tank. One path of high-pressure oil flowing through the manual three-position four-way reversing valve is communicated to an energy accumulator through a hydraulic control one-way valve and a 1 / 2 normal opening of a three-way ball valve A, the other path of the high-pressure oil is communicated to a driver piston cylinder through a P / A opening of a two-position three-way normally-closed control valve at the same time, and the high-pressure oil flowing through the two-position three-way normally-closed control valve is connected to a fire alarm fusible plug control opening through a throttling valve at the same time. On the basis that daily operation of the stop valve is met, multiple executable actions such as manual and automatic control, fire protection and energy storage are achieved, emergency situations are dealt with comprehensively and safely, and generalization performance is high.

Description

Technical Field

[0001] The utility model relates to an electro-hydraulic actuator for an emergency cut-off valve, belonging to the technical field of valve control. Background Art

[0002] The emergency cut-off valve mainly plays a role in timely cutting off the valve during emergencies in the production or operation process. For example, it is used to control the root valve of oil storage tanks in oil depots and tank farms. The cut-off valve is in an open state during normal operation and needs to be closed in case of emergencies such as fire or circuit failure. Therefore, very high requirements and large torque are needed for the control actuator of the cut-off valve. It is necessary to consider various emergencies to ensure that the cut-off valve can normally perform the cut-off action. Herein, an actuator for electro-hydraulic control of the cut-off valve is proposed in this case. Summary of the Invention

[0003] Aiming at the deficiencies in the above-mentioned prior art, the utility model proposes an electro-hydraulic actuator for an emergency cut-off valve, which can realize manual and automatic control, fire protection, energy storage and other executable actions on the basis of meeting the daily operation of the cut-off valve, and is comprehensive, safe and highly popularizable in dealing with emergencies.

[0004] In order to achieve the above purpose, the technical solution of the utility model is as follows: an electro-hydraulic actuator for an emergency cut-off valve, which comprises a pump, a first one-way valve, a two-position three-way normally open electromagnetic directional valve, and a manual three-position four-way directional valve that are sequentially connected through a liquid path by an oil tank. The high-pressure oil flowing through the manual three-position four-way directional valve has one path connected to an accumulator through a pilot-operated check valve and a 1 / 2 normally open port of a three-way ball valve A, and by pulling the handle of the two-position three-way normally closed control valve, the other path of high-pressure oil is simultaneously connected to the driver piston cylinder through the P / A port of the two-position three-way normally closed control valve. The high-pressure oil passing through the two-position three-way normally closed control valve is simultaneously connected to the fire alarm fusible plug control port and the two-position three-way normally closed control valve control port through a throttle valve, wherein,

[0005] Port 3 of the three-way ball valve A is connected to the driver piston cylinder through the P / A port of the two-position three-way normally closed control valve;

[0006] The controller controls the A / T port of the two-position three-way normally open electromagnetic directional valve to be connected and communicated with the oil tank by receiving the pressure signal of the pressure transmitter on the gas transmission pipeline during real-time monitoring. If an abnormal signal appears;

[0007] When the mechanical sensor on the gas transmission pipeline detects abnormal pressure on the gas transmission pipeline, the pressure at the control port of the two-position three-way normally closed control valve is released, and the spring pushes the spool of the two-position three-way normally closed control valve to move and connect the A / T port to the oil tank;

[0008] If the manual three-position four-way directional valve is in the closed position, the A / T port of the manual three-position four-way directional valve is connected and communicated with the oil tank;

[0009] If the fire alarm fusible plug melts, the K port of the two-position three-way normally closed control valve controls the pressure, and the A / T ports of the two-position three-way normally closed control valve are connected and communicated to the fuel tank.

[0010] Furthermore, the fuel tank is also connected in parallel to the manual A / B ports of the manual three-position four-way reversing valve through a manual pump and a second one-way valve connected in sequence.

[0011] Furthermore, the 1 / 2 normally open port of the three-way ball valve A is connected to the accumulator through the 1 / 2 normally open port of the three-way ball valve B, and the port 3 of the three-way ball valve B is connected to the fuel tank.

[0012] Furthermore, the first one-way valve is connected to a first pressure-limiting overflow valve to the fuel tank, the first pressure-limiting overflow valve is associated with a pressure switch, and the pressure switch is arranged on the pump.

[0013] Furthermore, a first pressure gauge is provided for the high-pressure oil of the first one-way valve.

[0014] Furthermore, the two-position three-way normally closed control valve is connected to a second pressure-limiting overflow valve to the fuel tank.

[0015] Furthermore, a meter stop valve and a second pressure gauge are provided for the high-pressure oil of the two-position three-way normally closed control valve.

[0016] The beneficial effects of the present utility model: Through the multi-factor control of the high-pressure oil of the driver piston cylinder, such as manual, automatic, fire protection, energy storage, system emergency protection caused by factors such as too high or too low pipeline pressure, pipe breakage protection, abnormal pressure fluctuation, etc., can all be satisfied by this actuator. Therefore, on the basis of meeting the daily operation of the cut-off valve, the present utility model realizes multiple executable actions such as manual and automatic control, fire protection, energy storage, etc., is comprehensive and safe in dealing with emergencies, and has strong popularization. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is the electro-hydraulic control schematic diagram of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] The present utility model will be further described in detail below with reference to specific embodiments and the accompanying drawings.

[0019] A kind of as Figure 1The electro-hydraulic actuator of the emergency cut-off valve shown includes a pump 2-1, a first one-way valve 5-1, a two-position three-way normally open electromagnetic directional control valve 8-1, and a manual three-position four-way directional control valve 8-2 that are sequentially connected through a hydraulic circuit from an oil tank 1-1. The high-pressure oil flowing through the manual three-position four-way directional control valve 8-2 passes through a hydraulic control one-way valve 5-4 and the 1 / 2 normal opening of a three-way ball valve A10-2 and is connected to an accumulator 12-1. By pulling the handle of the two-position three-way normally closed control valve 8-3, the other path of high-pressure oil is simultaneously connected to the drive piston cylinder 14-1 through the P / A port of the two-position three-way normally closed control valve 8-3. The high-pressure oil passing through the two-position three-way normally closed control valve 8-3 is simultaneously connected to the control port of a fire alarm fusible plug 8-4 and the control port of the two-position three-way normally closed control valve 8-3 through a throttle valve 9-1. Among them,

[0020] Port 3 of the three-way ball valve A10-2 is connected to the drive piston cylinder 14-1 through the P / A port of the two-position three-way normally closed control valve 8-3;

[0021] The controller 15-1 controls the A / T port of the two-position three-way normally open electromagnetic directional control valve 8-1 to be connected and communicated to the oil tank by receiving the pressure signal of a pressure sensor (externally connected) that monitors the pressure of the gas (liquid medium) pipeline in real time. If an abnormal signal appears, the mechanical sensor 16-1 controls the A / T port of the two-position three-way normally closed control valve 8-1 to be connected and communicated to the oil tank 1-1 by receiving the pressure signal of the pressure sensor that monitors the pressure of the gas (liquid medium) pipeline in real time;

[0022] If the manual three-position four-way directional control valve 8-2 is in the closed position, the A / T port of the manual three-position four-way directional control valve 8-2 is connected and communicated to the oil tank 1-1;

[0023] If the fire alarm fusible plug melts, the K port of the two-position three-way normally closed control valve 8-3 controls the pressure, and the A / T port of the two-position three-way normally closed control valve 8-3 is connected and communicated to the oil tank 1-1.

[0024] In this case, the drive piston cylinder 14-1 realizes the opening and closing of the cut-off valve through the pressure state of the high-pressure oil in the piston cylinder, and monitors the piston position of the drive piston cylinder 14-1 through a position transmitter 13-1.

[0025] First, the high-pressure oil sent out by the fuel tank 1-1 is filtered by the filter 4-1 to remove impurities, preventing the high-pressure oil with impurities from affecting the service life of each component in the liquid circuit. The high-pressure oil is driven by the motor M pump 2-1. To ensure pressure safety, the first check valve 5-1 is connected to the first pressure-limiting overflow valve 7-1 leading to the fuel tank 1-1. The first pressure-limiting overflow valve 7-1 is associated with a pressure switch 6-1, and the pressure switch 6-1 is installed on the pump 2-1. The high-pressure oil of the first check valve 5-1 is provided with a first pressure gauge 11-2. The high-pressure oil is used to observe data through the first pressure gauge 11-2. At the same time, the pressure of the high-pressure oil is set by the first limit overflow valve 7-1. For example, the set value is 21.5 MPa. When the set threshold is about 5 bar higher than the pressure switch 6-1, the first limit overflow valve 7-1 will circulate the high-pressure oil back to the fuel tank. When the set pressure of the pressure switch is 21 MPa, the pump is controlled to stop working, and when it is lower than 16 MPa, the pump starts working.

[0026] Similarly, an overflow protection device is provided at the high-pressure oil inlet position of the drive piston cylinder. That is, the two-position three-way normally closed control valve 8-1 is connected to the second pressure-limiting overflow valve 7-2 leading to the fuel tank 1-1; the high-pressure oil of the two-position three-way normally closed control valve 8-1 is provided with an instrument stop valve 10-1 and a second pressure gauge 11-1.

[0027] During function protection:

[0028] Manually close the valve:

[0029] Manually push the handle of the three-position four-way directional control valve 8-2 to the closed position on-site (ESD operation). The A port is connected to the T port, and the high-pressure oil of the drive piston cylinder 14-1 is discharged back to the fuel tank 1-1. The drive piston cylinder 14-1 drives the valve stem to close the valve under the push of the spring force.

[0030] Automatically close the valve:

[0031] When the system control cabinet 15-1 receives an external signal (pressure transmitter), and signals such as ultra-high pressure, underpressure (ultra-low pressure), pipe break protection (according to the pressure drop rate), and abnormal pressure fluctuation occur in the gas (liquid medium) transmission pipeline, the two-position three-way normally open solenoid directional control valve 8-1 is closed (power off), the A port is connected to the T port, and the high-pressure oil of the drive piston cylinder 14-1 is discharged back to the fuel tank 1-1. The drive piston cylinder 14-1 drives the valve stem to close the valve under the push of the spring force. The mechanical sensor 16-1 detects the signal of the gas (liquid medium) transmission pipeline and quickly discharges the control pressure of the K port of the two-position three-way normally closed control valve 8-3. At this time, the A port and the T port of the two-position three-way normally closed control valve 8-3 are connected, and the high-pressure oil of the drive piston cylinder 14-1 is discharged back to the fuel tank 1-1. The drive piston cylinder 14-1 drives the valve stem to close the valve under the push of the spring force.

[0032] Fire protection:

[0033] When a fire occurs, the fire alarm fusible plug melts to quickly release the control pressure at the K port of the two-position three-way normally closed control valve 8-3. At this time, the A port and the T port of the two-position three-way normally closed control valve 8-3 are connected, and the high-pressure oil in the drive piston cylinder 14-1 is discharged back to the oil tank 1-1. The drive piston cylinder 14-1 drives the valve stem to close the valve under the push of the spring force.

[0034] Accumulator valve function:

[0035] During the system pressurization process, it absorbs the pulse shock of the pump and supplements pressure to the hydraulic system during operation. During the valve closing process, the pressure of the accumulator 12-1 is not released under the control of the hydraulic check valve 5-4 and always remains. When it is necessary to use the pressure of the accumulator 12-1 to open the valve when the system pump has no power, connect the 1 / 3 port of the three-way ball valve A10-2 (bypass function), and the pressure enters the drive piston cylinder 14-1 to open the valve.

[0036] Manual pump valve opening function:

[0037] When the system has no power or the pump 2-1 fails, use the manual pump 3-1 to open the valve.

[0038] 1. Switch the operating handle of the manual three-position four-way directional control valve 8-2 to the middle position (manual position), connect the A / B ports, start the manual pump 3-1 to pressurize, the high-pressure oil passes through the hydraulic check valve 5-4, the 1 / 2 port of the three-way ball valve A10-2 (normal operation) and the 1 / 2 port of the three-way ball valve B10-3 to the accumulator 12-1. Another path passes through the two-position three-way normally closed control valve (pull the handle) 8-3 to connect the P / A ports, one path passes through the throttle valve 9-1 to the fire alarm fusible plug control port 8-4. At the same time, the K port of the two-position three-way normally closed control valve 8-3 is opened, and the high-pressure oil enters the drive piston cylinder 14-1 at the same time to open the valve. At this time, the system is in the automatic control working state.

[0039] When the accumulator has no pressure, the accumulator can be shielded through the switching function of the three-way ball valve B10-3.

[0040] The technical solutions provided by the embodiments of the present invention have been introduced in detail above. Specific examples are used in this article to elaborate on the principles and implementation manners of the embodiments of the present invention. The descriptions of the above embodiments are only applicable to help understand the principles of the embodiments of the present invention; at the same time, for those of ordinary skill in the art, based on the embodiments of the present invention, there will be changes in the specific implementation manners and application scopes. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. An electro-hydraulic actuator for an emergency shut-off valve, characterized in that: It includes a pump (2-1), a first one-way valve (5-1), a two-position three-way normally open electromagnetic reversing valve (8-1), and a manual three-position four-way reversing valve (8-2) that are sequentially connected through a liquid path from an oil tank (1-1). The high-pressure oil flowing through the manual three-position four-way reversing valve (8-2) has one path connected to an accumulator (12-1) through a hydraulic control one-way valve (5-4) and the 1 / 2 normal opening of a three-way ball valve A (10-2). When pulling the handle of the two-position three-way normally closed control valve (8-3), the other path of high-pressure oil is simultaneously connected to a driver piston cylinder (14-1) through the P / A port of the two-position three-way normally closed control valve (8-3). The high-pressure oil passing through the two-position three-way normally closed control valve (8-3) is simultaneously connected to the control port of a fire alarm fusible plug (8-4) and the control port of the two-position three-way normally closed control valve (8-3) through a throttle valve (9-1). Among them, Port 3 of the three-way ball valve A (10-2) is connected to the driver piston cylinder (14-1) through the P / A port of the two-position three-way normally closed control valve (8-3); The controller (15-1) controls the A / T port of the two-position three-way normally open electromagnetic reversing valve (8-1) to be connected and communicated with the oil tank (1-1) after receiving the pressure signal of the pressure transmitter on the real-time monitored gas pipeline and in case of an abnormal signal; When the mechanical sensor (16-1) on the gas pipeline detects abnormal pressure on the gas pipeline, it releases the pressure at the control port of the two-position three-way normally closed control valve (8-3), and the spring pushes the spool of the two-position three-way normally closed control valve (8-3) to move and connect the A / T port to the oil tank (1-1); If the manual three-position four-way reversing valve (8-2) is in the closed position, the A / T port of the manual three-position four-way reversing valve (8-2) is connected and communicated with the oil tank (1-1); If the fire alarm fusible plug melts, the K port of the two-position three-way normally closed control valve (8-3) controls the pressure, and the A / T port of the two-position three-way normally closed control valve (8-3) is connected and communicated with the oil tank (1-1).

2. The electro-hydraulic actuator of an emergency shut-off valve according to claim 1, characterized in that: The oil tank (1-1) is also bypass-connected to the manual neutral A / B ports of the manual pump (3-1), the second one-way valve (5-2), and the manual three-position four-way reversing valve (8-2) in sequence.

3. The electro-hydraulic actuator of an emergency cut-off valve according to claim 1, characterized in that: The 1 / 2 normal opening of the three-way ball valve A (10-2) is connected to the accumulator (12-1) through the 1 / 2 normal opening of a three-way ball valve B (10-3), and port 3 of the three-way ball valve B (10-3) is connected to the oil tank (1-1).

4. The electro-hydraulic actuator of an emergency cut-off valve according to claim 1, characterized in that: The first one-way valve (5-1) is connected to a first pressure-limiting overflow valve (7-1) and then to the oil tank (1-1). The first pressure-limiting overflow valve (7-1) is associated with a pressure switch (6-1), and the pressure switch (6-1) is arranged on the pump (2-1).

5. The electro-hydraulic actuator of an emergency cut-off valve according to claim 1, characterized in that: A first pressure gauge (11-2) is provided for the high-pressure oil of the first one-way valve (5-1).

6. The electro-hydraulic actuator of an emergency cut-off valve according to claim 1, characterized in that: The two-position three-way normally closed control valve (8-3) is connected to a second pressure-limiting overflow valve (7-2) and then to the oil tank (1-1).

7. The electro-hydraulic actuator of an emergency cut-off valve according to claim 1, characterized in that: An instrument stop valve (10-1) and a second pressure gauge (11-1) are provided for the high-pressure oil of the two-position three-way normally closed control valve (8-3).

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