CN117489838A - Explosion needle type pressure relief device of failure safety - Google Patents
Explosion needle type pressure relief device of failure safety Download PDFInfo
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- CN117489838A CN117489838A CN202311626941.1A CN202311626941A CN117489838A CN 117489838 A CN117489838 A CN 117489838A CN 202311626941 A CN202311626941 A CN 202311626941A CN 117489838 A CN117489838 A CN 117489838A
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- valve
- pressure
- pressure relief
- relief device
- piston
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- 238000004880 explosion Methods 0.000 title claims description 19
- 238000005422 blasting Methods 0.000 claims abstract description 30
- 230000007246 mechanism Effects 0.000 claims abstract description 28
- 239000012530 fluid Substances 0.000 claims abstract description 27
- 230000002457 bidirectional effect Effects 0.000 claims abstract description 25
- 239000002184 metal Substances 0.000 claims abstract description 4
- 230000006835 compression Effects 0.000 claims description 42
- 238000007906 compression Methods 0.000 claims description 42
- 238000007789 sealing Methods 0.000 claims description 12
- 230000000368 destabilizing effect Effects 0.000 claims description 7
- 230000006837 decompression Effects 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 4
- 230000008569 process Effects 0.000 claims description 3
- 230000000694 effects Effects 0.000 claims description 2
- 238000013461 design Methods 0.000 abstract description 4
- 238000003825 pressing Methods 0.000 abstract description 4
- 230000001960 triggered effect Effects 0.000 abstract description 2
- 238000011144 upstream manufacturing Methods 0.000 description 4
- 230000009172 bursting Effects 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000001687 destabilization Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/36—Safety valves; Equalising valves, e.g. pressure relief valves actuated in consequence of extraneous circumstances, e.g. shock, change of position
- F16K17/38—Safety valves; Equalising valves, e.g. pressure relief valves actuated in consequence of extraneous circumstances, e.g. shock, change of position of excessive temperature
- F16K17/383—Safety valves; Equalising valves, e.g. pressure relief valves actuated in consequence of extraneous circumstances, e.g. shock, change of position of excessive temperature the valve comprising fusible, softening or meltable elements, e.g. used as link, blocking element, seal, closure plug
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/16—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members
- F16K1/18—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps
- F16K1/22—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps with axis of rotation crossing the valve member, e.g. butterfly valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/32—Details
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
- F16K31/122—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a piston
- F16K31/1221—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a piston one side of the piston being spring-loaded
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K37/00—Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Safety Valves (AREA)
Abstract
The invention relates to a failure safety blasting needle type pressure relief device, and belongs to the field of overpressure protection design of pressure systems. A metal seal is arranged between the butterfly plate and the valve body; the valve rod is connected with the butterfly plate, and the upper end of the valve rod is connected with a shifting fork of the actuating mechanism; the hydraulic cylinder is filled with incompressible fluid; the bidirectional piston moves to drive the shifting fork to move and transmit torque to the valve rod of the main valve; the hydraulic cylinder of the control actuator is connected with the oil tank through the pilot valve piston cylinder; the pressure lever is arranged between the adjusting screw and the pilot valve piston; the adjusting screw is connected with the needle cage through threads, and the pressing rod is propped to a preset position by rotating the adjusting screw; the reset mechanism is connected with the valve rod through a key slot; medium enters the pilot valve piston cylinder through the pressure guiding pipe and the heat exchanging pipe; the medium pressure acts on the pressure lever via the pilot valve piston. According to the invention, the mechanical limit of the main valve is relieved through the instability of the pressure lever on the pilot valve, and the actuating mechanism is triggered to act at the same time, so that the main valve is driven to be opened in an auxiliary manner, the purpose of pressure relief is achieved, and the safety valve is provided with a failure safety mechanism.
Description
Technical Field
The invention belongs to the field of overpressure protection design of pressure systems, and relates to a failure safety blasting needle type pressure relief device.
Background
The design of the burst-needle pressure relief device as a core protective barrier for the pressure system should be fail safe, i.e. the result of it should be safe when certain critical components fail.
The current blasting needle type pressure relief device has various types, but is not in failure safety design.
Disclosure of Invention
The invention solves the technical problems that: the defect of the prior art is overcome, and the explosion needle type pressure relief device with failure safety is provided, the mechanical limit of the main valve is relieved through the instability of the pressure lever on the pilot valve, the action of the actuating mechanism is triggered at the same time, the main valve is driven to be opened in an auxiliary mode, the purpose of pressure relief is achieved, and the explosion needle type pressure relief device with failure safety mechanism is provided.
The solution of the invention is as follows:
a fail safe blasting needle type pressure relief device comprises a valve body, a butterfly plate, a valve rod, a reset mechanism, a heat exchange tube, a pressure guiding tube, a pilot valve piston cylinder, a pilot valve piston, a needle cage, a pressure rod, an adjusting screw, an oil tank, a hydraulic cylinder, a bidirectional piston, a shifting fork, a cylinder and a spring; wherein, the butterfly plate is sealed with the valve body by metal; the valve rod is connected with the butterfly plate, and the upper end of the valve rod is connected with a shifting fork of the actuating mechanism; the hydraulic cylinder is filled with incompressible fluid; the bidirectional piston moves to drive the shifting fork to move and transmit torque to the valve rod of the main valve; the air cylinder, the spring and the hydraulic cylinder all realize the motion affecting the bidirectional piston; the hydraulic cylinder of the control actuator is connected with the oil tank through the pilot valve piston cylinder; the pressure lever is arranged between the adjusting screw and the pilot valve piston; the adjusting screw is connected with the needle cage through threads, the adjusting screw is rotated to jack the pressing rod to a preset position, and the axial movement allowance of the pressing rod is realized; the reset mechanism is connected with the valve rod through a key slot; medium enters the pilot valve piston cylinder through the pressure guiding pipe and the heat exchanging pipe; the medium pressure acts on the pressure lever via the pilot valve piston.
In the above-mentioned fail-safe blasting needle type pressure relief device, when the valve body is closed, a pressure difference between an inlet and an outlet of the valve body generates a torque for opening the valve; this torque is transferred through the valve stem to the bi-directional piston and is counteracted by the incompressible fluid in the hydraulic cylinder.
In the fail-safe blasting needle type pressure relief device, the medium force is transmitted to the pressure lever through the bidirectional piston, and the pressure lever is automatically pressed; the locking nut locks the adjusting screw to prevent the compression bar from moving along the axial direction.
The failure safety blasting needle type pressure relief device, wherein the reset mechanism is a clutch type turbine worm mechanism; the turbine is connected with the valve rod key groove; a hand wheel is arranged at the worm; when the valve rod needs to be reset, the worm and the worm wheel are meshed through the clutch, and the hand wheel is rotated to provide torque to the valve rod; after the reset is completed, the worm gear is separated by clutch, so that the valve rod is kept free and is not self-locked by the worm gear.
In the above-mentioned fail-safe blasting needle type pressure relief device, under normal working conditions, the pressure of the external pressure-bearing equipment is below the opening pressure set by the pressure relief device; the axial compression load F applied to the compression rod is smaller than the destabilizing critical load Fcr of the compression rod, and the compression rod is kept in a stable state; the hydraulic cylinder in the actuator is filled with incompressible fluid, and the passage between the hydraulic cylinder and the oil tank is closed; at this time, the bidirectional piston cannot move in the opening direction of the valve body due to the incompressible nature of the fluid in the hydraulic cylinder, and the valve body is in a closed state.
In the above-mentioned fail-safe bursting needle type pressure relief device, when an overpressure occurs, the system pressure rises to the opening pressure set by the pressure relief device; the axial load F applied to the compression bar is greater than or equal to the destabilizing critical load Fcr of the compression bar; the compression bar is unstable, the pilot valve cylinder piston is driven by a medium and opens a passage between the actuator hydraulic cylinder and the oil tank; the fluid pressure in the hydraulic cylinder drops instantaneously, the valve of the valve body is automatically opened, the cylinder and the spring push the bidirectional piston to assist the valve of the valve body to open, and the fluid in the hydraulic cylinder is extruded into the oil tank to perform pressure relief.
In the above-mentioned safe blasting needle type pressure relief device of inefficacy, judge whether pressure relief device takes place the pressure release through the state of observing the depression bar.
After the pressure relief is finished, the main valve butterfly plate is reset through the reset mechanism, and the bidirectional piston moves towards the closing direction of the valve; the fluid in the tank is forced into the cylinder by atmospheric pressure.
The above-mentioned safe blasting needle type pressure relief device of inefficacy, the reset process after the valve is closed is:
resetting the pilot valve piston; closing a passage between the hydraulic cylinder and the oil tank; the compression bar is replaced, the compression bar is pressed in place by the adjusting screw, and the axial movement allowance of the compression bar is ensured; the adjusting screw is locked through the locking nut, so that the resetting of the blasting pressure relief device is realized.
In the above-mentioned safe bursting needle type pressure relief device, when the pilot valve piston seal fails, the medium of the bursting needle type pressure relief device flows to the atmosphere; when the explosion type pressure relief device is overpressurized, the medium pressure still pushes the pilot valve piston to realize the destabilization of the pressure lever and open the main valve; the explosion type pressure relief device is safe;
when the hydraulic cylinder is in failure in sealing, the fluid in the cylinder is decompressed, the valve is not prevented from being opened, and the pressure of the explosion type decompression device is directly released; the explosion type pressure relief device is safe;
when the sealing of the actuator cylinder fails or the spring fails, the compression bar is instable after the setting pressure is reached; the valve body realizes the opening and pressure relief of the valve through the butterfly plate; the explosion type pressure relief device is safe.
Compared with the prior art, the invention has the beneficial effects that:
(1) The main valve is installed by adopting an eccentric butterfly valve in parallel flow, and upstream medium enters the pilot valve through the heat exchange pipe, so that the pressure relief triggering mechanism and the sealing structure are ensured to have higher reliability under the severe working conditions of ultralow temperature and high temperature;
(2) When the pressure of the pipeline rises to the set opening pressure, the pilot valve is opened, the limit of the main valve is relieved, the main valve is automatically opened, and the actuator assists in opening the main valve, so that safe, accurate and rapid release is realized;
(3) The invention realizes failure safety, namely, the safety of the result can be ensured when the key part fails;
(4) The pressure release state of the invention is easy to observe, the maintenance workload is small, and the shutdown cost is low.
Drawings
FIG. 1 is a schematic view of the closing state of the blasting needle type pressure relief device of the present invention;
fig. 2 is a schematic diagram of an open state of the blasting needle type pressure relief device according to the present invention.
Detailed Description
The invention is further illustrated below with reference to examples.
The invention provides a failure safety blasting needle type pressure relief device, which realizes failure safety, namely, the safety of the result can be ensured when a key part fails. The main valve is installed by adopting an eccentric butterfly valve in parallel flow opening, and upstream medium enters the pilot valve through the heat exchange pipe, so that the pressure relief triggering mechanism and the sealing structure are ensured to have higher reliability under the severe working conditions of ultralow temperature and high temperature. When the pressure of the pipeline rises to the set opening pressure, the pilot valve is opened, the limit of the main valve is released, the main valve is automatically opened, and the actuator assists in opening the main valve, so that safe, accurate and rapid release is realized. In addition, the pressure release state is easy to observe, the maintenance workload is small, and the shutdown cost is low.
As shown in fig. 1, the blasting needle type pressure relief device specifically comprises a valve body 1, a butterfly plate 2, a valve rod 3, a reset mechanism 4, a heat exchange tube 5, a pressure guiding tube 6, a pilot valve piston cylinder 7, a pilot valve piston 8, a needle cage 9, a compression rod 10, an adjusting screw 11, an oil tank 12, a hydraulic cylinder 13, a bidirectional piston 14, a shifting fork 15, a cylinder 16 and a spring 17. Wherein, the butterfly plate 2 and the valve body 1 are sealed by metal; the valve rod 3 is connected with the butterfly plate 2, and the upper end of the valve rod 3 is connected with a shifting fork 15 of the actuating mechanism; the hydraulic cylinder 13 is filled with incompressible fluid; the bidirectional piston 14 moves to drive the shifting fork 15 to move and transmit torque to the main valve rod 3; cylinder 16, spring 17 and hydraulic cylinder 13 all effect movement of bi-directional piston 14; access to the tank 12 of the hydraulic cylinder 13 of the control actuator is achieved by means of a pilot valve piston cylinder 7; the pressure lever 10 is arranged between the adjusting screw 11 and the pilot valve piston 8; the adjusting screw 11 is connected with the needle cage 9 through threads, the adjusting screw 11 is rotated to push the pressure lever 10 to a preset position, and the pressure lever 10 has a movable allowance in the axial direction; the reset mechanism 4 is connected with the valve rod 3 through a key slot; medium enters a pilot valve piston cylinder 7 through a pressure guiding pipe 6 and a heat exchange pipe 5; the pressure of the medium acts on the pressure lever 10 via the pilot valve piston 8.
When the valve body 1 is closed, the pressure difference between the inlet and the outlet of the valve body 1 generates torque for opening the valve; this torque is transmitted through the valve stem 3 to the bi-directional piston 14 and is counteracted by the incompressible fluid in the hydraulic cylinder 13.
The medium on the upstream of the protected pipeline enters the pilot valve through the pressure guiding pipe 6 and the heat exchanging pipe 5, and the pressure of the medium acts on the pressure rod 10 through the pilot valve piston 8.
The actuator is composed of a cylinder 16, a spring 17, a shifting fork 15, a bidirectional piston 14, a hydraulic cylinder 13 and the like, and the hydraulic cylinder 13 is filled with incompressible fluid. Wherein the shifting fork 15 is connected with the main valve rod 3, the motion of the bidirectional piston 14 can drive the shifting fork 15 to move and transmit torque to the main valve rod 3, and the motion of the bidirectional piston 14 can be influenced by the air cylinder 16, the spring 17 and the hydraulic cylinder 13.
In the invention, the pressure lever 10 is arranged between the adjusting screw 11 and the pilot valve piston 8, the pilot valve pressure lever 10 bears the pressure of medium, and the pilot valve can be opened by destabilizing under the set opening pressure after accurate calculation and manufacture. The adjusting screw 11 is connected with the needle cage 9 through threads, the adjusting screw 11 is rotated to push the pressure rod 10 to a preset position, the pretightening force is not required to be applied, the pressure rod 10 is ensured to have a movable allowance in the axial direction, and after the device is installed into a pressure system, the medium force is transmitted to the pressure rod 10 through the piston, so that the pressure rod 10 can be automatically compressed. The locking nut locks the adjusting screw 11 to prevent the compression bar 10 from loosening in the axial direction, thereby affecting the set pressure of the pressure relief device.
The medium force is transmitted to the compression bar 10 through the bidirectional piston 14, and the compression bar 10 is automatically compressed; the lock nut locks the adjusting screw 11 to prevent the pressing rod 10 from moving in the axial direction.
The resetting mechanism 4 is a clutch type turbine worm mechanism; the turbine is connected with a key groove of the valve rod 3; a hand wheel is arranged at the worm; when the valve rod 3 is required to be reset, the worm and the worm wheel are meshed through the clutch, and the hand wheel is rotated to provide torque to the valve rod 3; after the reset is completed, the worm gear is separated by clutch, so that the valve rod 3 is kept free and is not self-locked by the worm gear.
The turbine is connected with a key slot of the main valve rod 3, and a hand wheel is arranged at the worm. When resetting is required, the worm wheel and the worm are meshed through the clutch, and the hand wheel is rotated to provide torque to the valve rod 3. After the reset is completed, the worm gear is separated by clutch, so that the valve rod 3 is kept free and is not self-locked by the worm gear.
Under normal working conditions, the pressure of external pressure-bearing equipment is lower than the opening pressure set by the pressure relief device; the axial compression load F applied to the compression rod 10 is smaller than the destabilizing critical load Fcr of the compression rod 10, and the compression rod 10 maintains a stable state; the hydraulic cylinder 13 in the actuator is filled with incompressible fluid and the communication with the tank 12 is closed; at this time, the bidirectional piston 14 cannot move in the direction of opening the valve of the valve body 1 due to incompressible nature of fluid in the hydraulic cylinder 13, and the valve body 1 is in a closed state, so that the sealing of the main valve is ensured.
When overpressure occurs, the system pressure rises to the opening pressure set by the pressure relief device; the axial load F applied to the compression bar 10 is greater than or equal to the destabilizing critical load Fcr of the compression bar 10; the compression bar 10 is unstable, the pilot valve cylinder piston 8 is driven by a medium and opens a passage between the actuator hydraulic cylinder 13 and the oil tank 12; the fluid pressure in the hydraulic cylinder 13 drops instantaneously, the valve of the valve body 1 is automatically opened, the air cylinder 16 and the spring 17 push the bidirectional piston 14 to assist the valve of the valve body 1 to be opened, and the fluid in the hydraulic cylinder 13 is extruded into the oil tank 12 for decompression, as shown in fig. 2. By observing the state of the compression bar 10, whether the pressure relief device is subjected to pressure relief or not is judged.
After the pressure relief is finished, the main valve butterfly plate 2 is reset through the reset mechanism 4, and meanwhile, the bidirectional piston 14 moves towards the closing direction of the valve; the fluid in the tank 12 is pressed into the hydraulic cylinder 13 by the atmospheric pressure.
An operator can judge whether the pressure relief device has relieved pressure by observing the state of the pressure lever 10. After the pressure release is finished, an operator can reset the main valve butterfly plate 2 by means of the reset mechanism 4, meanwhile, the bidirectional piston 14 moves towards the closing direction of the valve, fluid in the oil tank 12 is pressed into the hydraulic cylinder 13 of the actuator by atmospheric pressure, after the valve is closed, the pilot valve piston 8 is reset, the passage between the hydraulic cylinder 13 of the actuator and the oil tank 12 is closed, the pressure lever 10 is replaced, the pressure lever 10 is pressed in place by the adjusting screw 11, the pressure lever 10 is ensured to have a small movable amount in the axial direction, and the pressure lever 10 is locked by the locking nut, so that the resetting of the blasting pressure release device can be realized.
The reset process after the valve is closed is as follows:
resetting the pilot valve piston 8; closing the passage between the hydraulic cylinder 13 and the oil tank 12; the compression bar 10 is replaced, the compression bar 10 is pressed in place by the adjusting screw 11, and the compression bar 10 is ensured to have movable allowance in the axial direction; the adjusting screw 11 is locked by the locking nut, so that the resetting of the blasting pressure relief device is realized.
When the sealing of the pilot valve piston 8 fails, the medium of the blasting pressure relief device flows to the atmosphere; when the explosion type pressure relief device is overpressurized, the medium pressure still pushes the pilot valve piston 8 to realize the destabilization of the pressure lever 10 and open the main valve; the explosion type pressure relief device is safe;
when the sealing of the hydraulic cylinder 13 fails, the fluid in the cylinder is decompressed, the valve is not prevented from being opened, and the pressure of the explosion type decompression device is directly released; the explosion type pressure relief device is safe;
when the sealing of the actuator cylinder 16 fails or the spring 17 fails, the compression rod 10 is unstable after reaching the set pressure; the valve body 1 realizes the opening and pressure relief of the valve through the butterfly plate 2; the explosion type pressure relief device is safe.
The device realizes failure safety, namely, the safety of the result can be ensured when the key part fails. The main valve is installed by adopting an eccentric butterfly valve in parallel flow opening, and upstream medium enters the pilot valve through the heat exchange pipe, so that the pressure relief triggering mechanism and the sealing structure are ensured to have higher reliability under the severe working conditions of ultralow temperature and high temperature. When the pressure of the pipeline rises to the set opening pressure, the pilot valve is opened, the limit of the main valve is released, the main valve is automatically opened, and the actuator assists in opening the main valve, so that safe, accurate and rapid release is realized. In addition, the pressure release state is easy to observe, the maintenance workload is small, and the shutdown cost is low.
Although the present invention has been described in terms of the preferred embodiments, it is not intended to be limited to the embodiments, and any person skilled in the art can make any possible variations and modifications to the technical solution of the present invention by using the methods and technical matters disclosed above without departing from the spirit and scope of the present invention, so any simple modifications, equivalent variations and modifications to the embodiments described above according to the technical matters of the present invention are within the scope of the technical matters of the present invention.
Claims (10)
1. A safe blasting needle type pressure relief device of inefficacy, its characterized in that: the automatic control valve comprises a valve body (1), a butterfly plate (2), a valve rod (3), a reset mechanism (4), a heat exchange tube (5), a pressure guiding tube (6), a pilot valve piston cylinder (7), a pilot valve piston (8), a needle cage (9), a pressure rod (10), an adjusting screw (11), an oil tank (12), a hydraulic cylinder (13), a bidirectional piston (14), a shifting fork (15), a cylinder (16) and a spring (17); wherein, the butterfly plate (2) and the valve body (1) are sealed by metal; the valve rod (3) is connected with the butterfly plate (2), and the upper end of the valve rod (3) is connected with a shifting fork (15) of the actuating mechanism; the hydraulic cylinder (13) is filled with incompressible fluid; the bidirectional piston (14) moves to drive the shifting fork (15) to move and transmit torque to the main valve rod (3); the air cylinder (16), the spring (17) and the hydraulic cylinder (13) all realize the effect on the motion of the bidirectional piston (14); the hydraulic cylinder (13) of the control actuator is connected to the oil tank (12) through the pilot valve piston cylinder (7); the pressure lever (10) is arranged between the adjusting screw (11) and the pilot valve piston (8); the adjusting screw (11) is connected with the needle cage (9) through threads, the adjusting screw (11) is rotated to push the pressure lever (10) to a preset position, and the pressure lever (10) has a movable allowance in the axial direction; the reset mechanism (4) is connected with the valve rod (3) through a key slot; medium enters a pilot valve piston cylinder (7) through a pressure guiding pipe (6) and a heat exchanging pipe (5); the pressure of the medium acts on the pressure lever (10) via the pilot valve piston (8).
2. A fail-safe blasting needle type pressure relief device according to claim 1, wherein: when the valve body (1) is closed, the pressure difference between the inlet and the outlet of the valve body (1) generates torque for opening the valve; the torque is transmitted through the valve stem (3) to the bi-directional piston (14) and is counteracted by the incompressible fluid in the hydraulic cylinder (13).
3. A fail-safe blasting needle type pressure relief device according to claim 1, wherein: the medium force is transmitted to the compression bar (10) through the bidirectional piston (14), and the compression bar (10) is automatically compressed; the locking nut locks the adjusting screw (11) to prevent the compression bar (10) from moving along the axial direction.
4. A fail-safe blasting needle type pressure relief device according to claim 1, wherein: the reset mechanism (4) is a clutch type turbine worm mechanism; the turbine is connected with a key groove of the valve rod (3); a hand wheel is arranged at the worm; when the valve rod (3) needs to be reset, the worm and the worm wheel are meshed through the clutch, and the hand wheel is rotated to provide torque to the valve rod; after the reset is completed, the worm gear is separated by clutch, so that the valve rod (3) is kept free and is not self-locked by the worm gear.
5. A fail-safe blasting needle type pressure relief device according to claim 1, wherein: under normal working conditions, the pressure of external pressure-bearing equipment is lower than the opening pressure set by the pressure relief device; the axial compression load F applied to the compression rod (10) is smaller than the destabilizing critical load Fcr of the compression rod (10), and the compression rod (10) is kept in a stable state; the hydraulic cylinder (13) in the actuator is filled with incompressible fluid, and the passage between the hydraulic cylinder and the oil tank (12) is closed; at this time, the bidirectional piston (14) cannot move in the valve opening direction of the valve body (1) due to incompressible property of fluid in the hydraulic cylinder (13), and the valve body (1) is in a closed state.
6. The fail-safe blasting needle type pressure relief device according to claim 5, wherein: when overpressure occurs, the system pressure rises to the opening pressure set by the pressure relief device; the axial load F applied to the compression bar (10) is greater than or equal to the destabilizing critical load Fcr of the compression bar (10); the compression bar (10) is unstable, the pilot valve cylinder piston (8) is driven by a medium and opens a passage between the actuator hydraulic cylinder (13) and the oil tank (12); the fluid pressure in the hydraulic cylinder (13) drops instantaneously, the valve of the valve body (1) is automatically opened, the air cylinder (16) and the spring (17) push the bidirectional piston (14) to assist the valve of the valve body (1) to open, and the fluid in the hydraulic cylinder (13) is extruded into the oil tank (12) to release pressure.
7. The fail-safe blasting needle type pressure relief device of claim 6, wherein: by observing the state of the pressure lever (10), whether the pressure relief device is subjected to pressure relief or not is judged.
8. The fail-safe blasting needle type pressure relief device of claim 6, wherein: after the pressure relief is finished, the main valve butterfly plate (2) is reset through the reset mechanism (4), and the bidirectional piston (14) moves towards the closing direction of the valve; the fluid in the oil tank (12) is pressed into the hydraulic cylinder (13) by the atmospheric pressure.
9. The fail-safe blasting needle type pressure relief device of claim 8, wherein: the reset process after the valve is closed is as follows:
resetting the pilot valve piston (8); closing the passage between the hydraulic cylinder (13) and the oil tank (12); the compression bar (10) is replaced, the compression bar (10) is pressed in place by the adjusting screw (11), and the compression bar (10) is ensured to have movable allowance in the axial direction; the adjusting screw (11) is locked through the locking nut, so that the resetting of the blasting pressure relief device is realized.
10. A fail-safe blasting needle type pressure relief device according to claim 1, wherein: when the sealing of the pilot valve piston (8) fails, the medium of the blasting pressure relief device flows to the atmosphere; when the explosion type pressure relief device is overpressurized, the medium pressure still pushes the pilot valve piston (8) to realize the instability of the pressure lever (10) and open the main valve; the explosion type pressure relief device is safe;
when the sealing of the hydraulic cylinder (13) fails, the fluid in the cylinder is decompressed, the valve is not prevented from being opened, and the pressure of the explosion type decompression device is directly released; the explosion type pressure relief device is safe;
when the sealing of the actuator cylinder (16) fails or the spring (17) fails, the compression bar (10) is unstable after the setting pressure is reached; the valve body (1) realizes the opening and pressure relief of the valve through the butterfly plate (2); the explosion type pressure relief device is safe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311626941.1A CN117489838A (en) | 2023-11-30 | 2023-11-30 | Explosion needle type pressure relief device of failure safety |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311626941.1A CN117489838A (en) | 2023-11-30 | 2023-11-30 | Explosion needle type pressure relief device of failure safety |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117489838A true CN117489838A (en) | 2024-02-02 |
Family
ID=89678186
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311626941.1A Pending CN117489838A (en) | 2023-11-30 | 2023-11-30 | Explosion needle type pressure relief device of failure safety |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117489838A (en) |
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2023
- 2023-11-30 CN CN202311626941.1A patent/CN117489838A/en active Pending
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