CN210014061U

CN210014061U - Pipe burst cut-off valve

Info

Publication number: CN210014061U
Application number: CN201920490298.7U
Authority: CN
Inventors: 何锐; 刘卫理; 朱铁强
Original assignee: Zhejiang Bannige Fluid Control Co Ltd
Current assignee: Zhejiang Bannige Fluid Control Co Ltd
Priority date: 2019-04-11
Filing date: 2019-04-11
Publication date: 2020-02-04
Anticipated expiration: 2029-04-11

Abstract

The utility model discloses a pipe explosion trip valve, include: the main valve body is provided with a valve cavity, a first water inlet and a first water outlet, a valve rod penetrates through the main valve body, the valve rod penetrates through the valve cavity, a valve plate is fixedly arranged 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, a first piston cavity is formed in the rear valve body, an induction piston is arranged in the first piston cavity, one end, close to the valve rod, of the first piston cavity is provided with a penetrating hole, and an induction channel is further formed in the rear valve body and communicated with the first piston cavity; and the electromagnetic guide valve system and/or the mechanical guide 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 cutoff valve can realize water flow cutoff when pipe explosion occurs at upstream and can also realize water flow cutoff when pipe explosion occurs at downstream, and has the advantages of high cutoff efficiency, reliable work, lower production cost and strong environment adaptability.

Description

Pipe burst cut-off valve

Technical Field

The utility model belongs to the technical field of the valve, concretely relates to booster trip valve.

Background

Most of the water delivery pipe network is buried underground, daily maintenance and maintenance can not be implemented basically, and the water supply pipeline buried underground for a long time can cause the pipe wall to become thin and the strength to be reduced due to the effects of soil corrosion and electrochemical corrosion, so that the probability of pipe explosion accidents is increased. In addition, the reduction of the water passing section, the reduction of the water passing capacity, the increase of the pipeline resistance, the overload operation of the pipeline and the like caused by the scaling of the pipeline also easily cause the pipe explosion. For the pipeline with the overlong age, the pipe wall is fatigued under the interaction of corrosion and scaling, and the pipe explosion is almost difficult to avoid due to the change of ground load and seasonal temperature. Once a pipe is exploded, the medium itself is wasted greatly, more importantly, secondary disasters can be caused, public facilities are damaged, bridge sections are damaged, and particularly in hospitals, schools, gas stations and other places, even social problems can be caused once the pipe is exploded.

The existing pipe burst cut-off valve is generally in a butterfly type, the valve runs through a speed measuring device, an external control component and the like, a 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 in the occasions such as a trench and a valve well where maintenance is inconvenient, once the conditions such as water flooding, sundry invasion and the like occur, a transmission mechanism which is too long and too much and is positioned outside the valve is difficult to keep reliable running for a long time to deal with the pipe burst condition which occurs randomly. Meanwhile, the existing pipe explosion cut-off valve mainly deals with the condition of downstream pipe explosion, and the cut-off function can not be realized when the pipe explosion happens to the upstream.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem, the utility model provides a simple structure, action reliable, environmental suitability is strong, the blasting trip valve that upper and lower reaches blasting all can cut.

The utility model provides a technical scheme that its technical problem adopted is: a booster shut-off valve comprising:

the valve body is internally provided with a valve cavity, one side of the valve cavity is provided with a first water inlet, the other side of the valve cavity is provided with a first water outlet, a valve rod penetrates through the valve cavity, the valve rod penetrates through the valve cavity and is fixedly provided with a valve plate 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 communicated with a first water outlet, a first piston cavity which is axially arranged along the valve rod is arranged on the rear valve body, an induction piston is arranged in the first piston cavity, a penetrating hole which can be used for the valve rod to penetrate through and abut against the induction piston is formed in one end, close to the valve rod, of the first piston cavity, an induction channel is further formed in the rear valve body, and the induction channel is communicated with one end, away from the valve rod, of the first piston cavity;

and the electromagnetic conductance 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, so that the induction piston moves towards one end close to the induction channel under the action of the valve rod to enable the valve plate to close the first water outlet.

Preferably, the pipe explosion shut-off valve further comprises a reset maintenance main valve, and 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 being closed with the first water outlet.

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 and 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 greater than the self pressure value.

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 main reset maintenance valve, the bypass pipeline is provided with a first reset needle valve, 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 plate, the spring piston mechanism comprises a piston and a return spring, the piston comprises a piston head part arranged in the second piston cavity and a handle part connected with the piston head part and extending in the spring cavity through the partition plate, 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 far away from the spring cavity, and is closed by the head part of the piston, the second water outlet is connected to the side face, close to the second water inlet, of the second piston cavity, a sealing pair is formed between the piston head and the second piston cavity, a balance cavity is formed between the piston head and the partition plate, and the piston head always separates the second water outlet from 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 water draining needle valve, the second reset needle valve is arranged between the reset overhaul 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 water draining needle valve is connected with the second water outlet.

Preferably, the induction guide valve body is provided with an adjusting bolt in a penetrating way at one end of the spring cavity deviating from the second piston cavity, and the adjusting bolt is abutted to the return spring so as to adjust the compression amount of the return 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 all electrically connected with the PLC system.

Preferably, the main valve body includes left valve body and right valve body, the one end of left valve body is provided with left disk seat, first water inlet sets up on left disk seat, and has seted up left guiding hole on the disk seat of a left side, the one end of right valve body is provided with right disk seat, first delivery port sets up on right disk seat, and has seted up right guiding hole on the disk seat of the right side, the right valve body is connected with the one end that left disk seat is relative to the right valve body and the one end that right disk seat is relative to the left valve body, the valve rod is worn to locate in left guiding hole and the right guiding hole.

The utility model has the advantages that:

the pipe explosion cutoff valve can realize water flow cutoff when pipe explosion occurs at the upstream and can also realize water flow cutoff when pipe explosion occurs at the downstream, and has high cutoff efficiency and reliable work. Meanwhile, the structure is simple, the production cost is low, the motion reliability is high due to less transmission, and the environment adaptability is strong.

Drawings

The invention will be further described with reference to the following figures and examples:

FIG. 1 is a schematic diagram of one construction of a burst pipe shut-off valve;

FIG. 2 is a schematic diagram of one construction of a mechanically inductive pilot valve;

FIG. 3 is a schematic diagram of the operation of the downstream pipe bursting;

FIG. 4 is a schematic diagram of the operation of the upstream pipe bursting.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as 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 present invention, presented in the accompanying drawings, 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 utility model provides a pipe explosion trip valve, include:

the main valve body 100 is internally provided with a valve cavity, one side of the valve cavity is provided with a first water inlet 101, the other side of the valve cavity is provided with a first water outlet 102, a valve rod 103 penetrates through the main valve body 100, 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 plate 103 moves along the axial direction of the valve plate;

the rear valve body 300 is mounted on the main valve body 100 and communicated with the first water outlet 102, a first piston cavity 301 arranged along the axial direction of the valve rod 103 is arranged on the rear valve body 300, an induction piston 302 is mounted in the first piston cavity 301, a 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, an induction channel 303 is further formed in 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;

and the electromagnetic guide valve system and/or the mechanical guide valve system are/is communicated with the sensing channel 303 and automatically opened when the pressure value in the sensing channel 303 reaches a set value or is larger than the set value, 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.

During normal operation, it is ensured that the pressure applied to the valve plate 104 is equal to the pressure in the sensing channel 303 and equal to the set value of the electromagnetic and/or mechanical pilot valve system. When in downstream pipe explosion, the water yield is increased, the thrust borne by the valve plate 104 is increased, the pressure in the induction channel 303 is increased through the induction piston 302, the electromagnetic guide valve system and/or the mechanical guide valve system automatically starts pressure relief, the induction piston 302 can move, so that the valve plate 104 can move towards the first water outlet 102 and close the first water outlet 102, and the cut-off is realized. When the pipe is burst at the upstream, the water at the downstream flows back to push the valve plate 104 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 the structure is simpler than the structure form of the traditional butterfly valve and external control assembly, the work is more reliable, and the safety is high.

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, which is opposite to the left valve seat 105, is connected to one end of the right valve body 108, which is opposite to the right valve seat 106, by a bolt to form a valve cavity, and the valve rod 103 is disposed in the left guide hole. 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 passage is formed between the peripheral side of the valve plate 104 and the side wall of the valve cavity, and water flow is facilitated. 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 two 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 at 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 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 greater than the self pressure value.

As shown in fig. 2, the mechanical sense pilot valve 500 has a sense pilot valve body 508, a second piston chamber 514 and a spring chamber 515 are disposed in the sense 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 shank 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 shank of the piston 509 corresponds to the maximum cross-sectional area of the sense piston 302. The return spring 516 is installed in the spring cavity 515 and pushes against the end of the handle, the second water inlet 511 is connected to one end of the second piston cavity 514, which is 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 plate 510, and the piston head always separates the second water outlet 512 from 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 sealing performance. Meanwhile, an adjusting bolt 517 is arranged at one end, away from the second piston cavity 514, of the spring cavity 515 of the inductive valve body 508 in a penetrating manner, and the adjusting bolt 517 abuts against the return spring 516 so as to adjust the compression amount of the return spring 516.

Preferably, water pressure is used in the sensing channel 303, i.e. water is filled in 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, the burst pipe cut-off valve in this embodiment is further provided with a reset maintenance main valve 200, and the reset maintenance main valve 200 is connected with the first water inlet 101 and is used for controlling the valve plate 104 to open and reset after being closed with the first water outlet 102. The mechanical pilot valve system is further provided with a bypass line 507 and a three-way joint 505, the three-way joint 505 is arranged between the mechanical induction pilot valve 500 and the induction channel 303, one end of the bypass line 507 is connected with the three-way joint 505, the other end of the bypass line 507 is connected with a water inlet end line of the reset inspection main valve 200, the bypass line 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 line 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 water drain needle valve 506, the second reset needle valve 502 is arranged between the reset inspection main valve 200 and the main valve body 100, one end of the debugging needle valve 503 is connected with the balance chamber 513, the other end of the debugging needle valve 503 is connected with the first water outlet 102, and the first water drain needle valve 506 is connected with the second water outlet 512.

For ease of maintenance, a maintenance needle valve 504 is provided between the three way connection 505 and the sensing channel 303 so that the mechanical sensing pilot valve 500 can be removed separately 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, and 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 bleed needle valve 405 is connected to the output of the electromagnetic induction pilot valve 401 to control the valve closing speed by the bleed flow rate.

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 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 all electrically connected to the PLC system 400. During actual installation, the flow sensor 404 may be disposed on the rear valve body 300.

The working mechanism of the pipe explosion shut-off valve in the embodiment is as follows:

in the initial state, the reset service main valve 200 is closed, the water flow pressure of the first water inlet 101 is cut off, the first reset needle valve 501 is opened, the upstream water flow enters the sensing channel 303 through the bypass line 507, the three-way joint 505 and the service needle valve 504 and is filled, and the sensing piston 302 is pushed to the end of the first piston cavity 301. The water filling and air exhausting process can be detected through the electromagnetic induction guide valve 401 and the second water draining needle valve 405, when air is exhausted cleanly and outflow water is pressure water, the electromagnetic induction guide valve 401 and the second water draining needle valve 405 are closed, and water flow pressure in the induction channel 303 is kept. The induction piston 302 pushes the valve plate 104 to be located at the middle position of the valve cavity through the valve rod 103 in the process of being pushed, and an annular passage is formed on the peripheral side.

Then, the reset maintenance main valve 200 is opened at a constant speed, the first reset needle valve 501 is closed at the same time, the upstream and the downstream of the pipe explosion cut-off valve are communicated, water flow is limited by the valve plate 104 and is divided towards the periphery, the water flow 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, thrust is generated on the valve plate 104 by the water flow according to the flow bypassing phenomenon of hydrodynamics, the value of the acting force can be calculated according to the flow bypassing resistance, the valve plate 104 feeds the acting force back to the induction piston 302 through the valve rod 103, pressure is generated on the water flow in the induction channel 303, and the pressure can reversely control the position of the. When the pressure P1 in the sensing passage 303 is within the set range, the mechanical sense pilot valve 500 and the electromagnetic sense pilot valve 401 remain closed, so that the valve plate 104 is in the middle position of the valve cavity and water at normal flow rate can uniformly pass through the valve cavity.

The electromagnetic pilot valve system is provided with a first pressure sensor 402 and a second pressure sensor 403 respectively arranged in front of and behind the valve plate 104 to sense the pressure of water flow in front of and behind the valve plate 104, the flow rate in the cavity is measured through a flow rate sensor 404, all signals are converged into the PLC system 400, when the flow rate is in a set range, namely the pressure P1 in the sensing channel 303 is in the set range, the electromagnetic sensing pilot valve 401 is kept closed, the position of the valve plate 104 is controlled through the sensing piston 302, and water flow can normally pass through.

The mechanical pilot valve system is provided with a mechanical induction pilot valve 500 communicated with the induction channel 303, and when the pressure P1 in the induction 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, and water can normally pass through the mechanical induction pilot valve. The balance cavity 513 is communicated with the first water outlet 102 through the debugging needle valve 503 when water normally passes through, so that the blind plate thrust of the sensing piston 302 is balanced through the sensing channel 303, the spring force is only compared with the flow bypassing resistance of the valve plate 104 in the flow field, and the flow bypassing resistance is only related to the flow rate of the water flow, so that the flow rate of the water flow in the valve cavity can be directly set through setting of the spring force.

When downstream pipe bursting occurs, the state is as shown in fig. 3, and the operation condition of the pipe bursting cut-off valve is as follows:

for the mechanical pilot valve system, when a pipe burst accident occurs at the downstream, the flow rate in the valve cavity is increased sharply, the thrust of water flow to the valve plate 104 is increased, when the pressure value P1 acting in the sensing channel 303 through the sensing piston 302 is greater than the pressure value P2 set by the spring force of the return spring 516 in the mechanical sensing pilot valve 500, the head of the piston moves downwards to open the second water inlet 511 to communicate with the second water outlet 512, the water flow in the sensing channel 303 is discharged through the first water discharge needle valve 506, the water discharge speed can be regulated and controlled through the first water discharge 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 cutting off under the pressure of the upstream water flow;

for the electromagnetic pilot valve system, when a pipe burst accident occurs at the downstream, the flow rate in the valve cavity is increased sharply, the thrust of water flow to the valve plate 104 is increased, when the flow rate fed back by the flow sensor 404 is greater than the set value of the PLC system 400, the PLC system 400 sends a command to control the electromagnetic pilot valve 401 to open, the pressure water in the induction channel 303 is discharged through the second drain needle valve 405, the discharge speed can be regulated and controlled through the second drain needle valve 405, and then the valve plate 104 closes the first water outlet 102 under the pushing of the water flow to stop the upstream water flow and keeps cutting off under the pressure of the upstream water flow.

After repairing the downstream burst pipe, the reset overhaul main valve 200 is closed to cut off the upstream pressure, the first water drain 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 through the bypass pipeline 507, the three-way joint 505 and the overhaul needle valve 504 to be recharged, the second reset needle valve 502 is opened, the water flow pressure between the reset overhaul main valve 200 and the valve plate 104 is relieved, the sensing piston 302 pushes the valve rod 103 to drive the valve plate 104 to be separated from the first water outlet 102 under the action of the upstream water pressure to be reopened, after the valve is reopened, the first reset needle valve 501 and the second reset needle valve 502 are closed, the reset overhaul main valve 200 is opened slowly, the first water drain needle valve 506 of the mechanical pilot valve system is opened, and. In this process, the electromagnetic induction pilot valve 401 of the electromagnetic pilot valve system is directly closed again, so that the resetting of the electromagnetic pilot valve system can be realized.

When a pipe bursting accident occurs upstream, the state of the pipe bursting accident is as shown in fig. 4, the water flow downstream can flow backwards, so as to push the valve plate 104 to move towards the first water inlet 101, and since the valve rod 103 is not fixedly connected with the sensing piston 302, the valve plate 104 can be separated from the sensing piston 302 in the process until the valve plate 104 closes the first water inlet 101, the water flow is cut off, and the valve plate is always closed under the pressure of the water flow downstream. After the upstream pipe burst is repaired, the upstream pressure is recovered, and the valve plate 104 automatically returns to the middle position of the valve cavity to recover normal water supply.

The electromagnetic pilot valve system and the mechanical pilot valve system in the present embodiment may be provided at the same time, or only one of them may be provided. When the two are arranged, the electromagnetic pilot valve system has remote control feedback and remote control functions, the mechanical pilot valve system has an automatic control function, and the electromagnetic pilot valve system and the mechanical pilot valve system work in a matched mode, so that the working reliability of the pipe explosion cut-off valve can be effectively improved. When only the mechanical pilot valve system is arranged, the sensing channel 303 is also connected with a controllable valve so as to exhaust gas during water flow charging, and when only the electromagnetic pilot valve system is arranged, the water charging in the sensing channel 303 needs to be provided with structures such as a bypass 507 and the like in the mechanical pilot valve system.

Of course, the pipe bursting stop valve in the embodiment can also be used for other flowing media, and is not limited to water flow.

In summary, the pipe bursting stop valve in the embodiment can realize water flow cutoff when pipe bursting occurs upstream or downstream, and has high cutoff efficiency and reliable work. Meanwhile, the structure is simple, the production cost is low, the motion reliability is high due to less transmission, and the environment adaptability is strong.

The above embodiments are merely preferred embodiments of the present invention, and other embodiments are also possible. Equivalent modifications or substitutions may be made by those skilled in the art without departing from the spirit of the invention, and such equivalent modifications or substitutions are intended to be included within the scope of the claims set forth herein.

Claims

1. The utility model provides a tube explosion trip valve which characterized in that includes:

the valve comprises a main valve body (100), wherein a valve cavity is arranged 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 main valve body (100), the 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;

the rear valve body (300) is mounted on the main valve body (100) and communicated with the first water outlet (102), a first piston cavity (301) which is axially arranged along the valve rod (103) is formed in the rear valve body (300), an induction piston (302) is mounted in the first piston cavity (301), a penetrating hole which can be used 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), an induction channel (303) is further formed in 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);

and the electromagnetic guide valve system and/or the mechanical guide valve system are communicated with the sensing channel (303) and are automatically opened when the pressure value in the sensing channel (303) reaches a set value or is larger than the set value, 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).

2. The pipe bursting cut-off valve of claim 1, further comprising a reset service main valve (200), wherein the reset service main valve (200) is connected with the first water inlet (101) and used for controlling the valve plate (104) and the first water outlet (102) to be opened and reset after being closed.

3. A pipe explosion shutoff valve according to claim 2, 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) 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 self pressure value.

4. A pipe explosion shutoff valve as recited in claim 3, characterized in that said mechanical pilot valve system is further provided with a bypass line (507) and a three-way joint (505), said three-way joint (505) is disposed between the mechanical induction pilot valve (500) and the induction channel (303), one end of the bypass line (507) is connected with the three-way joint (505), the other end is connected with the water inlet end line of the reset inspection main valve (200), and the bypass line (507) is provided with a first reset needle valve (501), said first reset needle valve (501) is used for controlling the opening and closing of the bypass line (507).

5. A squib cut-off valve according to claim 3, wherein the mechanical sensing pilot valve (500) has a sensing pilot valve body (508), a second piston chamber (514) and a spring chamber (515) are arranged in the sensing pilot valve body (508), the second piston chamber (514) is separated from the spring chamber (515) by a partition (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 chamber (514) and a handle part connected with the piston head part and extending in the spring chamber (515) through the partition (510), the return spring (516) is arranged in the spring chamber (515) and pushing against the end of the handle part, the second water inlet (511) is connected with the end of the second piston chamber (514) departing from the spring chamber (515) and closed by the piston head part, and the second water outlet (512) is connected with the side of the second piston chamber (514) close to the second water inlet (511) And 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 plate (510), and the piston head always partitions the second water outlet (512) and the balance cavity (513).

6. A pipe bursting stop valve according to claim 5, wherein the mechanical pilot valve system is further provided with a second reset needle valve (502), a debugging needle valve (503) and a first water drain needle valve (506), the second reset needle valve (502) is arranged between the reset overhaul main valve (200) and the main valve body (100), one end of the debugging needle valve (503) is connected with the balance chamber (513), the other end of the debugging needle valve is connected with the first water outlet (102), and the first water drain needle valve (506) is connected with the second water outlet (512).

7. A pipe explosion shut-off valve according to claim 5, characterized in that the induction shut-off valve body (508) is provided with an adjusting bolt (517) at one end of the spring cavity (515) facing away from the second piston cavity (514), and the adjusting bolt (517) abuts against the return spring (516) for adjusting the compression amount of the return spring (516).

8. A pipe explosion shut-off valve according to claim 2, wherein 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).

9. A pipe bursting shut-off valve as claimed in claim 8 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 provided at the first water inlet (101), the second pressure sensor (403) and the flow sensor (404) are provided at the first water outlet (102), and the first pressure sensor (402), the second pressure sensor (403) and the flow sensor (404) are all electrically connected to the PLC system (400).

10. A pipe bursting cut-off valve according to any one of claims 1 to 9, wherein the main valve body (100) comprises a left valve body (107) and a right valve body (108), a left valve seat (105) is arranged at one end of the left valve body (107), the first water inlet (101) is arranged on the left valve seat (105), a left guide hole is arranged on the left valve seat (105), a right valve seat (106) is arranged at one end of the right valve body (108), the first water outlet (102) is arranged on the right valve seat (106), a right guide hole is arranged on 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.