CN109973694B - Explosion tube cut-off valve - Google Patents
Explosion tube cut-off valve Download PDFInfo
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- CN109973694B CN109973694B CN201910289913.2A CN201910289913A CN109973694B CN 109973694 B CN109973694 B CN 109973694B CN 201910289913 A CN201910289913 A CN 201910289913A CN 109973694 B CN109973694 B CN 109973694B
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- 238000004880 explosion Methods 0.000 title abstract description 33
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 168
- 230000006698 induction Effects 0.000 claims abstract description 50
- 230000000149 penetrating effect Effects 0.000 claims abstract description 7
- 238000012423 maintenance Methods 0.000 claims description 22
- 230000007246 mechanism Effects 0.000 claims description 14
- 238000005192 partition Methods 0.000 claims description 10
- 230000009471 action Effects 0.000 claims description 9
- 230000005674 electromagnetic induction Effects 0.000 claims description 9
- 238000007789 sealing Methods 0.000 claims description 8
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 238000011144 upstream manufacturing Methods 0.000 abstract description 20
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 230000001276 controlling effect Effects 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 239000000306 component Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 238000005474 detonation Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000006056 electrooxidation reaction Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000009545 invasion Effects 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001932 seasonal effect Effects 0.000 description 1
- 239000002689 soil Substances 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
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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
- F16K37/0025—Electrical or magnetic means
- F16K37/005—Electrical or magnetic means for measuring fluid parameters
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Fluid-Driven Valves (AREA)
Abstract
The invention discloses a pipe explosion cut-off valve, which comprises: the main valve body is provided with a valve cavity, a first water inlet and a first water outlet, the main valve body is penetrated with a valve rod, the valve rod penetrates through the valve cavity and is fixedly provided with a valve plate in the valve cavity, and the valve plate can close the first water inlet or the first water outlet; the rear valve body is arranged on the main valve body and communicated with the first water outlet, the rear valve body is provided with a first piston cavity, an induction piston is arranged in the first piston cavity, one end of the first piston cavity, which is close to the valve rod, is provided with a penetrating hole, and the rear valve body is also provided with an induction channel which is communicated with the first piston cavity; and the electromagnetic pilot valve system and/or the mechanical pilot valve system are communicated with the induction channel and are automatically opened when the pressure value in the induction channel reaches a set value or is larger than the set value. The pipe explosion cut-off valve can cut off water flow when pipe explosion occurs at the upstream and also can cut off water flow when pipe explosion occurs at the downstream, and is high in cut-off efficiency, reliable in work, low in production cost and strong in environment adaptability.
Description
Technical Field
The invention belongs to the technical field of valves, and particularly relates to a pipe explosion cut-off valve.
Background
Most of the water delivery pipe network is buried underground, daily maintenance and maintenance cannot be basically implemented, and the water supply pipe buried underground for a long time can cause thinning and strength reduction of the pipe wall due to the effects of soil corrosion and electrochemical corrosion, so that the probability of pipe explosion accidents is increased. In addition, the water flow section is reduced, the water flow capacity is reduced, the pipeline resistance is increased, and the pipeline overload operation and the like are easy to cause pipe explosion due to pipeline scaling. For a pipeline with overlong pipeline age, under the interaction of corrosion and scaling, the fatigue of the pipeline wall, the change of ground load and the change of seasonal temperature are almost unavoidable. Once the pipe is burst, the medium is wasted greatly, and more importantly, secondary disasters can be caused, public facilities are damaged, bridge sections are destroyed, and social problems can be even caused once the pipe is burst, particularly in the areas of hospitals, schools, gas stations and the like.
The existing pipe explosion cut-off valve is generally butterfly, the valve operation is composed of a speed measuring device, an external control component and the like, the valve plate serving as a core component can execute valve closing action only through control conduction of an external system, the reliability is low, and particularly when the valve is installed in a trench, a valve well and other places inconvenient to maintain, once flooding, sundry invasion and the like occur, a transmission mechanism which is too long and too many and is positioned outside the valve is difficult to keep reliable operation for a long time to cope with random pipe explosion. Meanwhile, the existing pipe explosion cut-off valve mainly aims at the condition of downstream pipe explosion and can not realize the cut-off function for upstream pipe explosion.
Disclosure of Invention
In order to solve the problems, the invention provides the pipe explosion cut-off valve which has the advantages of simple structure, reliable action and strong environment adaptability and can cut off the pipe explosion both at the upstream and downstream.
The invention solves the technical problems by adopting a technical scheme that: a squib shut-off valve comprising:
the main valve body is internally provided with a valve cavity, a first water inlet is formed in one side of the valve cavity, a first water outlet is formed in the other side of the valve cavity, a valve rod penetrates through the valve cavity, a valve plate is fixedly arranged in the valve cavity, and the size of the valve plate is smaller than that of the valve cavity and larger than that of the first water inlet and the first water outlet, so that the first water inlet or the first water outlet can be closed when the valve rod moves along the axial direction of the valve rod;
the rear valve body is arranged on the main valve body and is communicated with the first water outlet, a first piston cavity axially arranged along the valve rod is arranged on the rear valve body, an induction piston is arranged in the first piston cavity, an insertion hole for the valve rod to penetrate into and abut against is formed in one end, close to the valve rod, of the first piston cavity, and an induction channel is further arranged on the rear valve body and is communicated with one end, deviating from the valve rod, of the first piston cavity;
and the electromagnetic pilot valve system and/or the mechanical pilot valve system are communicated with the sensing channel and are automatically opened when the pressure value in the sensing channel reaches a set value or more, so that the sensing piston moves towards one end close to the sensing channel under the action of the valve rod to enable the valve plate to close the first water outlet.
Preferably, the pipe explosion cut-off valve further comprises a reset maintenance main valve, wherein the reset maintenance main valve is connected with the first water inlet and used for controlling the valve plate to be opened and reset after the first water outlet is closed.
Preferably, the mechanical pilot valve system is provided with a mechanical induction pilot valve, the mechanical induction pilot valve is provided with a second water inlet, a second water outlet and a spring piston mechanism for normally isolating the second water inlet from the second water outlet, the second water inlet is communicated with the induction channel, and the spring piston mechanism can conduct the second water outlet and the second water inlet when the pressure in the induction channel is larger than the pressure value of the spring piston mechanism.
Preferably, the mechanical pilot valve system is further provided with a bypass pipeline and a three-way joint, the three-way joint is arranged between the mechanical induction pilot valve and the induction channel, one end of the bypass pipeline is connected with the three-way joint, the other end of the bypass pipeline is connected with a water inlet end pipeline of the reset maintenance main valve, a first reset needle valve is arranged on the bypass pipeline, and the first reset needle valve is used for controlling the opening and closing of the bypass pipeline.
Preferably, the mechanical induction pilot valve is provided with an induction pilot valve body, a second piston cavity and a spring cavity are arranged in the induction pilot valve body, the second piston cavity is separated from the spring cavity by a partition board, the spring piston mechanism comprises a piston and a return spring, the piston comprises a piston head arranged in the second piston cavity and a handle part connected with the piston head and extending in the spring cavity through the partition board, the return spring is arranged in the spring cavity and pushes the tail end of the handle part, the second water inlet is connected with one end of the second piston cavity, which is away from the spring cavity, and is closed by the piston head, the second water outlet is connected with the side surface of the second piston cavity, which is close to the second water inlet, a sealing pair is formed between the piston head and the partition board, and the piston head always cuts off the second water outlet and the balance cavity.
Preferably, the mechanical pilot valve system is further provided with a second reset needle valve, a debugging needle valve and a first drainage needle valve, the second reset needle valve is arranged between the reset maintenance main valve and the main valve body, one end of the debugging needle valve is connected with the balance cavity, the other end of the debugging needle valve is connected with the first water outlet, and the first drainage needle valve is connected with the second water outlet.
Preferably, the sensing guide valve body is provided with an adjusting bolt in a penetrating manner at one end of the spring cavity, which is away from the second piston cavity, and the adjusting bolt is abutted against the reset spring so as to be used for adjusting the compression amount of the reset spring.
Preferably, the electromagnetic pilot valve system is provided with a PLC system and an electromagnetic induction pilot valve, and the electromagnetic induction pilot valve is communicated with the induction channel and is electrically connected with the PLC system.
Preferably, the electromagnetic pilot valve system is further provided with a first pressure sensor, a second pressure sensor and a flow sensor, the first pressure sensor is arranged at the first water inlet, the second pressure sensor and the flow sensor are arranged at the first water outlet, and the first pressure sensor, the second pressure sensor and the flow sensor are electrically connected with the PLC system.
Preferably, the main valve body comprises a left valve body and a right valve body, wherein a left valve seat is arranged at one end of the left valve body, a first water inlet is formed in the left valve seat, a left guide hole is formed in the left valve seat, a right valve seat is formed in one end of the right valve body, a first water outlet is formed in the right valve seat, a right guide hole is formed in the right valve seat, one end, opposite to the left valve seat, of the left valve body is connected with one end, opposite to the right valve seat, of the right valve body, and the valve rod penetrates through the left guide hole and the right guide hole.
The beneficial effects of the invention are as follows:
the pipe explosion cut-off valve can cut off water flow when pipe explosion occurs at the upstream and can cut off water flow when pipe explosion occurs at the downstream, and is high in cut-off efficiency and reliable in operation. Meanwhile, the device has the advantages of low production cost due to simple structure, high action reliability due to less transmission and strong environment adaptability.
Drawings
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
FIG. 1 is a schematic illustration of a construction of a squib shutoff valve;
FIG. 2 is a schematic illustration of a construction of a mechanically actuated pilot valve;
FIG. 3 is a schematic diagram of the operation of the downstream squib;
fig. 4 is a schematic diagram of the operation of the upstream squib.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention.
Referring to fig. 1, 3 and 4, the present invention provides a squib cut-off valve comprising:
the main valve body 100 is internally provided with a valve cavity, a first water inlet 101 is arranged at one side of the valve cavity, a first water outlet 102 is arranged at the other side of the valve cavity, a valve rod 103 is arranged on the main valve body 100 in a penetrating manner, the valve rod 103 penetrates through the valve cavity and is fixedly provided with a valve plate 104 in the valve cavity, and the size of the valve plate 104 is smaller than that of the valve cavity and larger than that of the first water inlet 101 and the first water outlet 102, so that the first water inlet 101 or the first water outlet 102 can be closed when the valve rod 103 moves along the axial direction of the valve plate;
the rear valve body 300 is arranged on the main valve body 100 and is communicated with the first water outlet 102, a first piston cavity 301 axially arranged along the valve rod 103 is arranged on the rear valve body 300, an induction piston 302 is arranged in the first piston cavity 301, an penetrating hole for the valve rod 103 to penetrate and abut against the induction piston 302 is formed in one end, close to the valve rod 103, of the first piston cavity 301, and an induction channel 303 is further arranged on the rear valve body 300, and the induction channel 303 is communicated with one end, away from the valve rod 103, of the first piston cavity 301;
a solenoid pilot valve system and/or a mechanical pilot valve system, which is communicated with the sensing channel 303 and is automatically opened when the pressure value in the sensing channel 303 reaches a set value or more, so that the sensing piston 302 moves towards one end close to the sensing channel 303 under the action of the valve rod 103 to enable the valve plate 104 to close the first water outlet 102.
In normal operation, it is ensured that the valve plate 104 is subjected to a pressure equal to the pressure in the sensing channel 303 and equal to the set point of the solenoid pilot valve system and/or the mechanical pilot valve system. When the downstream pipe is detonated, the water yield is increased, the thrust borne by the valve plate 104 is increased, the pressure in the sensing channel 303 is increased through the sensing piston 302, and the electromagnetic pilot valve system and/or the mechanical pilot valve system automatically open the pressure relief, so that the sensing piston 302 can move, the valve plate 104 can move towards the first water outlet 102 and close the first water outlet 102, and the cutting-off is realized. When the pipe is burst at the upstream, water at the downstream flows back, and the valve plate 104 is pushed to move towards the first water inlet 101 to close the first water inlet 101, so that the cutting-off is realized. Therefore, the pipe explosion cut-off valve in the embodiment can realize the water flow cut-off function when pipe explosion occurs at the upstream and the downstream, and has simpler structure, more reliable work and high safety compared with the structure of the traditional butterfly valve and external control assembly.
As shown in fig. 1, the main valve body 100 in this embodiment includes a left valve body 107 and a right valve body 108, one end of the left valve body 107 is provided with a left valve seat 105, the first water inlet 101 is disposed on the left valve seat 105, a left guide hole is formed in the left valve seat 105, one end of the right valve body 108 is provided with a right valve seat 106, the first water outlet 102 is disposed on the right valve seat 106, a right guide hole is formed in the right valve seat 106, one end of the left valve body 107 opposite to the left valve seat 105 is connected with one end of the right valve body 108 opposite to the right valve seat 106 through a bolt, and the valve rod 103 is disposed in the left guide hole and the right guide hole in a penetrating manner. And the inner wall of the valve cavity formed by the left valve body 107 and the right valve body 108 is an arc surface, so that an annular channel is formed between the peripheral side of the valve plate 104 and the side wall of the valve cavity, and water flow is convenient to pass through. In order to enhance the sealing of the valve plate 104 to the first water inlet 101 and the first water outlet 102, sealing rings may be disposed on both sides of the valve plate 104 corresponding to the first water inlet 101 and the first water outlet 102, or sealing rings may be disposed on positions of the first water inlet 101 and the first water outlet 102 corresponding to the valve plate 104.
The mechanical pilot valve system is provided with a mechanical induction pilot valve 500, the mechanical induction pilot valve 500 is provided with a second water inlet 511, a second water outlet 512 and a spring piston mechanism which normally cuts off the second water inlet 511 and the second water outlet 512, the second water inlet 511 is communicated with the induction channel 303, and the spring piston mechanism can conduct the second water outlet 512 and the second water inlet 511 when the pressure in the induction channel 303 is larger than the pressure value of the spring piston mechanism.
As shown in fig. 2, the mechanical pilot valve 500 has a pilot valve body 508, a second piston chamber 514 and a spring chamber 515 are disposed in the pilot valve body 508, the second piston chamber 514 is separated from the spring chamber 515 by a partition 510, the spring piston mechanism includes a piston 509 and a return spring 516, the piston 509 includes a piston head mounted in the second piston chamber 514 and a stem connected to the piston head and extending through the partition 510 into the spring chamber 515, and the difference in area between the piston head and the stem of the piston 509 corresponds to the largest cross-sectional area of the pilot piston 302. The return spring 516 is installed in the spring cavity 515 and pushes the end of the handle, the second water inlet 511 is connected to one end of the second piston cavity 514 facing away from the spring cavity 515 and is closed by the piston head, the second water outlet 512 is connected to the side surface of the second piston cavity 514, which is close to the second water inlet 511, a sealing pair is formed between the piston head and the second piston cavity 514, a balance cavity 513 is formed between the piston head and the partition 510, and the piston head always cuts off the second water outlet 512 and the balance cavity 513. Sealing rings can be arranged between the piston head and the second piston cavity 514, between the partition plate and the handle part and between the end surface of the piston head and the second water inlet 511 to increase the tightness. Meanwhile, an adjusting bolt 517 is disposed on the end of the sensing guide valve body 508, which is away from the second piston cavity 514, in the spring cavity 515, and the adjusting bolt 517 abuts against the return spring 516, so as to be used for adjusting the compression amount of the return spring 516.
The water pressure in the sensing channel 303 is preferably used, i.e. water is injected into the sensing channel 303 and the first piston chamber 301. In order to ensure that the water pressure in the sensing channel 303 is consistent with the water pressure at the first water inlet 101, in this embodiment, the pipe explosion shutoff valve is further provided with a reset maintenance main valve 200, and the reset maintenance main valve 200 is connected to the first water inlet 101 and is used for controlling the valve plate 104 to be opened and reset after being closed with the first water outlet 102. The mechanical pilot valve system is further provided with a bypass pipeline 507 and a three-way joint 505, the three-way joint 505 is arranged between the mechanical pilot valve 500 and the induction channel 303, one end of the bypass pipeline 507 is connected with the three-way joint 505, the other end is connected with a water inlet end pipeline of the reset maintenance main valve 200, a first reset needle valve 501 is arranged on the bypass pipeline 507, and the first reset needle valve 501 is used for controlling the opening and closing of the bypass pipeline 507.
Further, the mechanical pilot valve system is further provided with a second reset needle valve 502, a debugging needle valve 503 and a first drain needle valve 506, the second reset needle valve 502 is arranged between the reset maintenance main valve 200 and the main valve body 100, one end of the debugging needle valve 503 is connected with the balance cavity 513, the other end of the debugging needle valve 503 is connected with the first water outlet 102, and the first drain needle valve 506 is connected with the second water outlet 512.
For convenient maintenance, a maintenance needle valve 504 is arranged between the three-way joint 505 and the induction channel 303, so that the mechanical induction pilot valve 500 can be independently disassembled for maintenance.
As shown in fig. 1, the electromagnetic pilot valve system is provided with a PLC system 400 and an electromagnetic induction pilot valve 401, wherein the electromagnetic induction pilot valve 401 is communicated with the induction channel 303 and is electrically connected with the PLC system 400. And a second drain needle valve 405 is connected to the output of the solenoid pilot valve 401 to control the valve closing speed by the drain flow rate.
And the electromagnetic pilot valve system is further provided with a first pressure sensor 402, a second pressure sensor 403 and a flow sensor 404, wherein the first pressure sensor 402 is arranged at the first water inlet 101, the second pressure sensor 403 and the flow sensor 404 are arranged at the first water outlet 102, and the first pressure sensor 402, the second pressure sensor 403 and the flow sensor 404 are electrically connected with the PLC system 400. The flow sensor 404 may be provided on the rear valve body 300 during actual installation.
The working mechanism of the pipe explosion shutoff valve in this embodiment is as follows:
in the initial state, the reset maintenance main valve 200 is closed, the water flow pressure of the first water inlet 101 is blocked, the first reset needle valve 501 is opened, the upstream water flow enters the sensing channel 303 through the bypass pipeline 507, the three-way joint 505 and the maintenance needle valve 504 and is full, and meanwhile the sensing piston 302 is pushed to the end part of the first piston cavity 301. The water filling and exhausting process can be detected through the electromagnetic induction pilot valve 401 and the second draining needle valve 405, and when the air is completely exhausted and the pressure water flows out, the electromagnetic induction pilot valve 401 and the second draining needle valve 405 are closed, so that the water flow pressure in the induction channel 303 is kept. The sensing piston 302 pushes the valve plate 104 to be positioned at the middle position of the valve cavity through the valve rod 103 in the pushing process, and an annular channel is formed at the periphery.
After that, the reset maintenance main valve 200 is opened at a constant speed, the first reset needle valve 501 is closed, the upstream and downstream of the pipe explosion cut-off valve are communicated, water flow is limited by the valve plate 104 to be separated to the periphery, flows into the downstream through an annular channel formed between the outer edge of the valve plate 104 and the inner wall of the valve cavity, the water flow generates thrust to the valve plate 104 according to the hydrodynamic bypass phenomenon, the value of the acting force can be calculated according to the bypass resistance calculation, the valve plate 104 feeds back the acting force to the sensing piston 302 through the valve rod 103, and pressure is generated to the water flow in the sensing channel 303, and the pressure can reversely control the position of the valve plate 104 through the sensing piston 302 due to the sealing of the sensing channel 303. When the pressure P1 in the sensing channel 303 is within the set range, the mechanically and electromagnetically sensed pilot valves 500, 401 remain closed, allowing the valve plate 104 to be in a neutral position in the valve cavity, and a normal flow rate of water can be evenly passed through the valve cavity.
The electromagnetic pilot valve system is provided with a first pressure sensor 402 and a second pressure sensor 403 respectively at the front and the back of the valve plate 104 to sense the pressure of water flow before and after the valve plate 104, and the flow sensor 404 is used for measuring the flow in the cavity, all signals are input into the PLC system 400, when the flow is in a set range, namely the pressure P1 in the sensing channel 303 is in the set range, the electromagnetic pilot valve 401 is kept closed, the position of the valve plate 104 is controlled by the sensing piston 302, and the water flow can normally pass through.
The mechanical pilot valve system is provided with a mechanical pilot valve 500 communicated with the sensing channel 303, and when the pressure P1 in the sensing channel 303 is smaller than the pressure value P2 set by the spring force of the return spring 516, the second water inlet 511 is closed by the piston head, so that water flow can normally pass through. When water flow passes through normally, the balance cavity 513 is communicated with the first water outlet 102 through the regulating needle valve 503, so that blind plate thrust of the sensing piston 302 is balanced through the sensing channel 303, the spring force is only compared with the flow-around resistance of the valve plate 104 in the flow field, and the flow-around resistance is only related to the flow velocity of the water flow, so that the flow velocity of the water flow in the valve cavity can be directly set through setting of the spring force.
When the downstream pipe burst occurs, the state is as shown in fig. 3, and the operation condition of the pipe burst cut-off valve is as follows:
for the mechanical pilot valve system, when a pipe explosion accident occurs in the downstream, the flow rate in the valve cavity is rapidly increased, the thrust of the water flow to the valve plate 104 is increased, when the pressure value P1 acted on the sensing channel 303 by the sensing piston 302 is larger than the pressure value P2 set by the spring force of the reset spring 516 in the mechanical pilot valve 500, the piston head descends to open the second water inlet 511 to be communicated with the second water outlet 512, the water flow in the sensing channel 303 is discharged through the first drainage needle valve 506, the drainage speed of the water flow can be regulated and controlled through the first drainage needle valve 506, and then the valve plate 104 closes the first water outlet 102 under the pushing of the water flow to cut off the upstream water flow and keeps cut off all the time under the pressure of the upstream water flow;
for the electromagnetic pilot valve system, when a pipe explosion accident occurs at the downstream, the flow rate in the valve cavity is rapidly increased, the thrust of water flow to the valve plate 104 is increased, when the feedback flow rate of the flow sensor 404 is larger than the set value of the PLC system 400, the PLC system 400 sends a command to control the electromagnetic pilot valve 401 to be opened, the pressure water in the induction channel 303 is discharged through the second draining needle valve 405, the discharging speed can be regulated and controlled through the second draining needle valve 405, and then the valve plate 104 closes the first water outlet 102 under the pushing of the water flow, cuts off the upstream water flow and keeps cut off all the time under the pressure action of the upstream water flow.
After the downstream pipe explosion is repaired, the reset maintenance main valve 200 is closed to cut off the upstream pressure, the first water discharge needle valve 506 of the mechanical pilot valve system is closed, the first reset needle valve 501 of the mechanical pilot valve system is opened, the upstream water flow enters the sensing channel 303 to be recharged, the second reset needle valve 502 is opened, the water flow pressure between the reset maintenance main valve 200 and the valve plate 104 is removed, the sensing piston 302 pushes the valve rod 103 to drive the valve plate 104 to be separated from the first water outlet 102 to be reopened under the action of the upstream water pressure, the first reset needle valve 501 and the second reset needle valve 502 are closed after the opening is finished, the reset maintenance main valve 200 is slowly opened, the first water discharge needle valve 506 of the mechanical pilot valve system is opened, and the normal operation is restored. In this process, the electromagnetic induction pilot valve 401 of the electromagnetic pilot valve system is directly closed again, so that the electromagnetic pilot valve system can be reset.
When a pipe explosion accident occurs in the upstream, as shown in fig. 4, the downstream water flow flows backwards, so that the valve plate 104 is pushed to move towards the first water inlet 101, and the valve rod 103 is not fixedly connected with the sensing piston 302, so that the valve rod is separated from the sensing piston 302 until the valve plate 104 closes the first water inlet 101, the water flow is blocked, and the valve plate is always kept closed under the pressure of the downstream water flow. After the restoration of the upstream detonation tube, the upstream pressure is restored, and the valve plate 104 automatically returns to the middle position of the valve cavity to restore the normal water supply.
The electromagnetic pilot valve system and the mechanical pilot valve system in this embodiment may be provided at the same time, or only one of them may be provided. When the two solenoid pilot valve systems are arranged, the solenoid pilot valve system has the functions of remote control feedback and remote control, and the mechanical pilot valve system has the function of automatic control, so that the two solenoid pilot valve systems work cooperatively, and the working reliability of the pipe explosion cut-off valve can be effectively improved. When only the mechanical pilot valve system is arranged, the induction channel 303 is also connected with a controllable valve so as to facilitate the air discharge when water is filled, and when only the electromagnetic pilot valve system is arranged, the water filling in the induction channel 303 is required to be provided with a bypass pipeline 507 and other structures in the mechanical pilot valve system.
Of course, the squib cut-off valve in this embodiment can be used for other flowing media, and is not limited to water flow.
In summary, the pipe explosion shutoff valve in this embodiment can realize water flow shutoff when pipe explosion occurs upstream, and also can realize water flow shutoff when pipe explosion occurs downstream, and has high shutoff efficiency and reliable operation. Meanwhile, the device has the advantages of low production cost due to simple structure, high action reliability due to less transmission and strong environment adaptability.
The above examples are only preferred embodiments of the invention, and other embodiments of the invention are possible. Equivalent modifications and substitutions can be made by those skilled in the art without departing from the spirit of the invention, and these equivalent modifications or substitutions are intended to be included within the scope of the present claims.
Claims (4)
1. A squib shut-off valve, characterized by comprising:
the main valve comprises a main valve body (100), wherein a valve cavity is formed in the main valve body (100), a first water inlet (101) is formed in one side of the valve cavity, a first water outlet (102) is formed in the other side of the valve cavity, a valve rod (103) penetrates through the valve cavity, a valve plate (104) is fixedly arranged in the valve cavity, and the size of the valve plate (104) is smaller than that of the valve cavity and larger than that of the first water inlet (101) and the first water outlet (102), so that the first water inlet (101) or the first water outlet (102) can be closed when the valve rod (103) moves along the axial direction of the valve rod;
the reset maintenance main valve (200) is connected with the first water inlet (101) and is used for controlling the valve plate (104) to be opened and reset after being closed with the first water outlet (102);
the rear valve body (300) is arranged on the main valve body (100) and is communicated with the first water outlet (102), a first piston cavity (301) axially arranged along the valve rod (103) is arranged on the rear valve body (300), an induction piston (302) is arranged in the first piston cavity (301), one end, close to the valve rod (103), of the first piston cavity (301) is provided with a penetrating hole for the valve rod (103) to penetrate and abut against the induction piston (302), the rear valve body (300) is further provided with an induction channel (303), and the induction channel (303) is communicated with one end, deviating from the valve rod (103), of the first piston cavity (301);
an electromagnetic pilot valve system and/or a mechanical pilot valve system which are communicated with the induction channel (303) and are automatically opened when the pressure value in the induction channel (303) reaches a set value or more so that the induction piston (302) moves towards one end close to the induction channel (303) under the action of the valve rod (103) to enable the valve plate (104) to close the first water outlet (102); wherein,
the mechanical pilot valve system is provided with a mechanical induction pilot valve (500), the mechanical induction pilot valve (500) is provided with a second water inlet (511), a second water outlet (512) and a spring piston mechanism for normally isolating the second water inlet (511) from the second water outlet (512), the second water inlet (511) is communicated with the induction channel (303), and the spring piston mechanism can conduct the second water outlet (512) and the second water inlet (511) when the pressure in the induction channel (303) is larger than the pressure value of the spring piston mechanism; the mechanical pilot valve system is further provided with a bypass pipeline (507) and a three-way joint (505), the three-way joint (505) is arranged between the mechanical pilot valve (500) and the induction channel (303), one end of the bypass pipeline (507) is connected with the three-way joint (505), the other end of the bypass pipeline is connected with a water inlet end pipeline of the reset maintenance main valve (200), the bypass pipeline (507) is provided with a first reset needle valve (501), and the first reset needle valve (501) is used for controlling the opening and closing of the bypass pipeline (507); the mechanical induction pilot valve (500) is provided with an induction pilot valve body (508), a second piston cavity (514) and a spring cavity (515) are arranged in the induction pilot valve body (508), the second piston cavity (514) is separated from the spring cavity (515) by a partition plate (510), the spring piston mechanism comprises a piston (509) and a return spring (516), the piston (509) comprises a piston head part arranged in the second piston cavity (514) and a handle part connected with the piston head part and extending in the spring cavity (515) through the partition plate (510), the return spring (516) is arranged in the spring cavity (515) and pushes the tail end of the handle part, the second water inlet (511) is connected with one end of the second piston cavity (514) which is far away from the spring cavity (515) and is closed by the piston head part, the second water outlet (512) is connected with the side surface of the second piston cavity (514) which is close to the second water inlet (511), a sealing pair is formed between the piston head part and the second piston cavity (514) and the partition plate (510) to form a balancing cavity (513), and the second water outlet (513) is always blocked with the second water outlet (513); the mechanical pilot valve system is further provided with a second reset needle valve (502), a debugging needle valve (503) and a first drainage needle valve (506), the second reset needle valve (502) is arranged between the reset maintenance main valve (200) and the main valve body (100), one end of the debugging needle valve (503) is connected with the balance cavity (513), the other end of the debugging needle valve is connected with the first water outlet (102), and the first drainage needle valve (506) is connected with the second water outlet (512);
the electromagnetic pilot valve system is provided with a PLC system (400) and an electromagnetic induction pilot valve (401), and the electromagnetic induction pilot valve (401) is communicated with the induction channel (303) and is electrically connected with the PLC system (400).
2. A squib cut-off valve according to claim 1, wherein the induction pilot valve body (508) is provided with an adjusting bolt (517) in an end of the spring chamber (515) facing away from the second piston chamber (514), the adjusting bolt (517) abutting against the return spring (516) for adjusting the compression of the return spring (516).
3. The squib shut-off valve of claim 1, wherein the solenoid pilot valve system is further provided with a first pressure sensor (402), a second pressure sensor (403) and a flow sensor (404), the first pressure sensor (402) is disposed at the first water inlet (101), the second pressure sensor (403) and the flow sensor (404) are disposed at the first water outlet (102), and the first pressure sensor (402), the second pressure sensor (403) and the flow sensor (404) are electrically connected to the PLC system (400).
4. A squib cut-off valve according to any one of claims 1 to 3, wherein the main valve body (100) comprises a left valve body (107) and a right valve body (108), one end of the left valve body (107) is provided with a left valve seat (105), the first water inlet (101) is arranged on the left valve seat (105), a left guide hole is formed in the left valve seat (105), one end of the right valve body (108) is provided with a right valve seat (106), the first water outlet (102) is arranged on the right valve seat (106), a right guide hole is formed in the right valve seat (106), one end of the left valve body (107) opposite to the left valve seat (105) is connected with one end of the right valve body (108) opposite to the right valve seat (106), and the valve rod (103) is arranged in the left guide hole and the right guide hole in a penetrating manner.
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| CN201910289913.2A CN109973694B (en) | 2019-04-11 | 2019-04-11 | Explosion tube cut-off valve |
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| CN201910289913.2A CN109973694B (en) | 2019-04-11 | 2019-04-11 | Explosion tube cut-off valve |
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| CN109973694B true CN109973694B (en) | 2024-02-23 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110925452B (en) * | 2019-12-03 | 2021-06-04 | 中铁五局集团第一工程有限责任公司 | Engineering water supply system based on BIM |
| CN113564880B (en) * | 2020-04-29 | 2024-06-25 | 青岛海尔洗涤电器有限公司 | Drum washing machine |
| CN112797207B (en) * | 2021-03-01 | 2022-09-06 | 四川长仪油气集输设备股份有限公司 | Pilot-operated pipeline explosion positive and negative action axial flow type self-closing valve |
| CN114607813A (en) * | 2022-03-24 | 2022-06-10 | 君品集团有限公司 | Well head emergency cut-off device |
| CN117016157B (en) * | 2023-10-09 | 2024-01-05 | 中国农业科学院农田灌溉研究所 | Pneumatic pipeline fertilizer conveying system for irrigation |
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| JPH11287342A (en) * | 1998-02-03 | 1999-10-19 | Kurimoto Ltd | Emergency shutoff valve |
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| CN109973694A (en) | 2019-07-05 |
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