WO2001075356A1

WO2001075356A1 - A pipe burst protect device

Info

Publication number: WO2001075356A1
Application number: PCT/CN2001/000138
Authority: WO
Inventors: Xiangwei Zeng
Original assignee: Xiangwei Zeng
Priority date: 2000-03-27
Filing date: 2001-02-22
Publication date: 2001-10-11
Also published as: AU3909501A; CN1148524C; CN1419643A

Abstract

A pipe burst protect device which can close a valve by self-force and a cleaning pipe device can pass through it. Said device includes a main valve and a first control device which controls the main valve to open and close; a sensory element which can sense flow rate; and a control device to control the movement of the sensory element.

Description

Self-supporting ball type pipeline blasting protection device

The present invention relates to a control device for a fluid pipeline, in particular to a pipeline blast protection device for a pipeline capable of passing a long-distance fluid through a pig. Background technique

The existing pipeline blast protection system has a gas-liquid linkage emergency cut-off system, which uses multiple valves and energy storage tanks to transmit, convert, and amplify the pressure drop signal caused by the blast through multiple stages to form a sufficiently large thrust to promote the hydraulic drive device. To drive the ball valve to cut off the flow channel. This kind of pipeline blast protection system has complicated structures and long pressure drop signal transmission lines. It is necessary to use external energy such as energy storage tanks to achieve pipeline closure protection.

Pipelines that transport fluids, especially those with media deposits and corroded peelings from the pipe wall, need to be cleaned by a pig in the pipeline to restore the pipeline's transport capacity. Because the pig must fit well with the hole diameter of the pipe, usually, the pig can pass through the fluid line to clean the pipeline when the valve is in the full-lift state. Technical solutions

In view of this, an object of the present invention is to provide a self-supporting ball-type pipe blasting protection device capable of closing a valve by using a fluid in a pipe when the pipe leaks due to blasting, and also passing a pig.

To achieve the above object, the present invention provides a self-supporting ball-type pipeline blasting protection device, including:

A main valve and a first controller for controlling opening and closing of the main valve, the main valve having a valve body in communication with a fluid pipe, a main valve core arranged in the valve body, and a main valve connected to the main valve core A valve stem; the first controller includes:

A first piston-type hydraulic control cylinder, a control rod connected to a control piston provided in the cylinder body of the hydraulic cylinder is connected to the main valve and is used for converting the linear reciprocating movement of the piston into The opening and closing movement of the main spool; the cylinder cavity of the first hydraulic cylinder is divided into a first cavity and a second cavity by the piston, and a reset spring for resetting the control piston is installed in the first cavity The second chamber is formed with a first cylinder port for discharging fluid therein, and a control valve is configured to control the discharge of the fluid in the second chamber through the first cylinder port;

A flow sensor for sensing the flow velocity of the fluid in the fluid tube, and controlling the connection or disconnection of the fluid tube and the second cavity of the hydraulic cylinder according to the flow velocity of the fluid in the fluid tube, When a preset flow velocity value is exceeded, the flow sensor communicates the fluid tube with the second cavity of the hydraulic cylinder; the flow sensor may be at a first position in the fluid tube and from the fluid tube Moving between the second positions moved out; and

The self-supporting ball-type pipeline blast protection device further includes a control device for controlling the movement of the current sensor.

Preferably, the current sensor includes a current sensing tube and a flow control tube communicating with the current sensing tube via a valve seat. The current sensing tube is provided with a valve core that cooperates with the valve seat to open and close, and a return spring that resets the valve core The flow sensing tube is arranged in the fluid tube and communicates with the flow channel of the fluid tube. The flow control tube is in communication with the second cavity of the hydraulic cylinder. When the flow velocity of the fluid exceeds a preset flow velocity value, Spool and seat are open

Preferably, the flow sensor is disposed in the main valve core, and the flow control tube of the flow sensor extends through the main valve stem in a tube shape along the axis and is movable relative to the main valve stem.

Preferably, it further comprises a pressure storage cylinder, and a second cylinder port is formed in the second cavity of the second hydraulic cylinder, and the pressure storage cylinder communicates with the flow control tube and communicates with the first hydraulic cylinder through the second cylinder port. The two chambers communicate with each other, an airbag is installed in the pressure storage cylinder, and a reverse damping regulating valve is provided on a connection path between the second cavity of the first hydraulic cylinder and the pressure storage cylinder.

Preferably, a third cylinder port is formed in the first cavity of the first hydraulic cylinder, the third cylinder port is in communication with the fluid pipe, and a reverse damping adjustment valve or a solenoid valve is provided in the third cylinder port or communicates with the third cylinder port. On the pipeline between the third cylinder port and the fluid pipe, the current sensing pipe is located at a substantially central position of the fluid pipe.

Preferably, the first cylinder port is in communication with the fluid pipe via a pipeline.

Preferably, the control valve is a solenoid valve or a manual valve.

Preferably, the flow-sensing tube is arranged along the flow line of the fluid in the fluid tube and connected to the flow control tube in a T-shape.

Preferably, a rack is formed on the control rod of the first hydraulic cylinder, and the rack meshes with a gear mounted on a main valve stem of the main valve. Preferably, the control device for controlling the movement of the current sensor includes: a second hydraulic cylinder, which includes a piston arranged in the cylinder body of the second hydraulic cylinder and a piston rod connected to the piston, and the piston rod is connected with the returned sensor; A drive transmission connection for driving the current sensor to move the current sensor; a pass valve configured on a pipeline connecting the fluid pipe and the second hydraulic cylinder; and a second controller for controlling the action of the pass valve In order to use the pressure fluid in the fluid pipe to control the reciprocating movement of the second hydraulic cylinder piston.

Preferably, the bypass valve is used to control the communication between the two chambers separated by the piston of the second hydraulic cylinder and the fluid pipe and the atmosphere, and the spool of the bypass valve can enter its second work by activating the second controller. Position, when the spool of the pass valve is in the second working position, the fluid pipe is in communication with the first cavity of the hydraulic cylinder, and the second cavity is in communication with the atmosphere; the same-inch pass valve spool can be returned by deactivating the second controller In its first working position, when the spool of the access valve is in the first working position, the fluid pipe is in communication with the second cavity of the second hydraulic cylinder, and the first cavity is in communication with the atmosphere.

Preferably, the second controller includes a bypass valve stem connected to the spool of the bypass valve, and when the spool of the bypass valve is in its second working position, an end of the bypass valve stem facing away from the spool of the bypass valve extends into the fluid And the tube is arranged in such a way that the moving pig can push the bypass valve stem to move the bypass valve spool to its first working position; the controller further includes a hydraulic force operatively connected to the bypass valve The reset valve is provided on the downstream side of the bypass valve. The reset valve spool is connected with a reset valve stem, and the reset valve spool and the reset valve stem are biased by a spring to its first working position. In the working position, the end of the reset valve stem facing away from the reset valve spool extends into the fluid tube, and is arranged so that the moving pig can overcome the bias of the spring and push the reset stem to switch the reset valve spool. To its second working position; when the spool of the bypass valve is pushed out to its second working position by the pig, the second controller is activated, and the hydraulic holding cylinder communicates with the fluid pipe via the reset valve and the bypass valve for will The valve spool is maintained in its second operating position; while the reset valve is pushed out to its second operating position by the pig, the controller is deactivated, and the hydraulic holding cylinder passes the reset valve and the passage to the atmosphere. The wide core of the access valve returns to its first working position.

Preferably, the bypass valve is a two-position four-way valve, and the reset valve is a two-position three-way valve. Preferably, a bidirectional regulating valve is provided on a pipeline between the second hydraulic cylinder and the access valve.

Preferably, the piston rod of the second hydraulic cylinder is coaxially connected with the flow control tube of the current sensor and is integrated with the flow control tube.

Preferably, a third cylinder port is formed in the first cavity of the first hydraulic cylinder, the third cylinder port communicates with the second cavity of the second hydraulic cylinder via a pipeline, and the third cylinder port is provided with a solenoid valve or a reverse valve. Damping adjustment Valve.

The main valve may be a valve that can pass the pig, such as a ball valve, a ffl plate valve, etc .; or a valve that can pass the pig, which the inventor has applied for a patent.

The foregoing structure of the present invention provides the following advantages and effects.

First, the current sensor and the control cylinder of the present invention are crusted. By using a pipe blasting failure, fluid leakage causes a sharp change in the flow velocity of the fluid in the fluid pipe, and a difference in kinetic energy is generated between the two ends of the current pipe of the current sensor, which is transmitted to the current The current sensing tube in the device pushes the valve core to turn the normally closed valve core and the valve seat into an open state. The fluid flows from the current sensing tube through the valve seat and the control tube into the control cylinder, and the control piston is pushed through the control rod. The main valve stem is driven to close the main valve and close the pipeline, thereby protecting the pipeline and preventing a large amount of fluid leakage; when the kinetic energy of the two ends of the current sensing tube is balanced, the valve core is reset by the spring, and the valve core and the valve seat are closed and reset After the fault is removed, the control cylinder is reset, and the transmission main valve is reset, so that the main valve is controlled. The invention has the advantage of using fluid kinetic energy to control the main valve by itself to protect the fluid pipeline; in particular, because the current sensor can accept the fluid kinetic energy change in front of and behind the main valve, it has the advantage of no manual operation.

2. The hydraulic cylinder of the present invention is connected with the sensor drive, and the bypass valve connecting the hydraulic cylinder and the fluid tube is formed. The hydraulic cylinder and the bypass valve can send the pressure fluid in the fluid tube into And discharge the hydraulic cylinder, use the kinetic energy of the fluid to drive the hydraulic cylinder to move, and operate the flow sensor to move up and down into the work position to make the pipeline open when the main valve is fully open; The controller of the cylinder and the reset valve is crusted, so that the inductor can be kept in the exiting working state, thereby having the advantage of ensuring that the pig is passed smoothly.

3. The integrated structure of the present invention, in which the flow sensor is arranged in the flow passage of the main spool of the main valve, and the combined structure connected with the piston of the hydraulic cylinder, not only has the advantage of allowing the pig to pass smoothly, Moreover, it has the advantages of small overall volume and convenient installation on pipelines. The airbag in the energy storage tank is crusted, and energy is stored when the fluid kinetic energy is large before the fluid enters the control cylinder through the energy storage cylinder. At the end of the main valve closing time, the fluid kinetic energy is released in a small amount, and the main valve is closed reliably. The advantages.

The reverse damping control valve of the control cylinder port of the present invention is crusted and has a delaying effect to maintain the current state of the main valve. The main valve can be maintained in the opened or closed state. The control of the cylinder port and the solenoid valve of the present invention can set the controller of the solenoid valve at a long distance. Therefore, based on the self-powered type, the remote control of the manual control valve of the cylinder port can be realized. After the main valve is closed by the current sensor and the control cylinder, the manual control valve is used to manually open the cylinder port to reset the main valve and the control cylinder. The bidirectional regulating valve on the pipeline between the hydraulic cylinder and the access valve of the present invention is crusted, which can The flow rate of the fluid fed into and discharged from the hydraulic cylinder is adjusted, thereby having the advantage of adjusting the speed of the sensor entering and exiting the working position.

5. The control rod of the control cylinder and the main valve rod of the present invention are connected by a rack and pinion, and have the advantages of simple structure and reliable operation. Brief description of the drawings

The present invention is further described in detail below with reference to the accompanying drawings and embodiments, in which

FIG. 1 is a schematic diagram of a first embodiment of a self-supporting ball-type pipe blasting protection device according to the present invention, showing a state in which a current sensor is initially opened and a control cylinder has not been operated;

FIG. 2 is a view similar to FIG. 1, showing a state when the fluid transfer line is cleaned with a pig;

FIG. 3 is a schematic diagram of a second embodiment of a self-supporting ball type pipeline blast protection device according to the present invention, in which a current sensor is installed in a main valve. Detailed description of the preferred embodiment

Example 1

As shown in Figs. 1 and 2, a first-pass ball-type pipeline blast protection device according to a first embodiment of the present invention is formed by a main valve and a control device. The control device is composed of a control cylinder 4, a pressure storage cylinder 16, a current sensor 18, a hydraulic cylinder 25, a pass valve 29 and a controller. The controller is used to control the pass valve, and a hydraulic holding cylinder 43, a reset valve 48, etc. to make. The main valve is installed in the fluid line, and the current sensor 18, the pass valve 29 and the reset valve 48 are fixed to a proper length of the connecting pipe. The connecting pipe is connected to the main valve and coincides with the fluid line to become a part of the fluid pipe. The hydraulic cylinder 25 is stacked above the pressure storage cylinder 16, the control cylinder 4 is arranged on the hydraulic cylinder side, and the hydraulic holding cylinder 43 is stacked above the bypass valve.

The main valve 1 is connected to the fluid pipe 2 with a normal knot, and has a valve body having a generally cavity shape. The main valve core in the valve body is connected to the main valve stem 3. A valve cover may be provided at the upper end of the valve body, and the valve body and the valve cover may adopt a common integrated crust, or a common flange-type coupling crust. The main valve stem 3 and the main valve core can adopt the usual solid coupling, such a valve can be a ball valve, etc .; it can also use the usual rotary coupling, the corresponding main valve core is a reciprocating type. Such a knotted valve may be a gate valve, a gate valve, or the like, or a valve capable of passing the pig of the present inventor.

The control cylinder 4 is a conventional cylindrical hydraulic cylinder. The cylinder inside the control cylinder has a usually scabbed cylinder The control piston 5 is shaped like a coil spring 6 for returning the control piston to a cylinder cavity at the left end of the control piston. The extended end of the control rod 7 connected to the control piston is made into a rack 8. The control cylinder has a cylinder port 9 and a cylinder port 10 at the right end, and a cylinder port 11 at the left end. The cylinder port 9 is provided with a normal reverse damping regulating valve, and communicates with the pressure storage cylinder 16 through a pipeline 60. The cylinder port 10 is equipped with a normal solenoid valve, and communicates with the fluid pipe 2 through a pipeline 12. Cylinder port 11 is equipped with a normal solenoid valve or a reverse damping regulating valve. The valves of each cylinder port can also be replaced with manual valves such as manual gate valves. The control cylinder 4 is placed horizontally above the main valve, and is fixedly integrated with the hydraulic cylinder by common scabbing. The control rod 7 connected to the control piston is perpendicular to the main valve rod 3, and a gear 13 meshed with the rack 8 is fixed on the main valve rod. Therefore, the main valve stem 3 can perform a rotational movement with the reciprocating motion of the control lever 7.

A base 14 is fixed at a proper position of the fluid tube 2 and can be made into a proper shape. The base is fixedly connected to the outside of the fluid tube. A concave cavity 15 is formed at the bottom thereof. The shape of the four cavity 15 and the opening formed on the fluid tube are formed. The shapes match. A tube hole communicating with the cavity and used for fitting the flow control tube 20 is formed in the middle of the base 14.

The pressure storage cylinder 16 can be made into a cylindrical tank and stacked on the base to be integrated with the base. The cylinder cavity of the pressure storage cylinder communicates with the tube hole of the base. An ordinary gas-filled airbag 17 is installed in the cylinder cavity of the pressure storage cylinder. The cylinder port of the pressure storage cylinder is connected to the cylinder port 9 of the control cylinder via a line 60, so that the pressure storage red 16 and the control cylinder 4 communicate with each other.

The current sensor 18 is a T-shaped tubular crust, which has a circular tube-shaped current tube 19 extending along the direction of the fluid tube, and a circular tube-shaped flow control tube 20 which is perpendicular to the current tube. The current sensing tube 19 is disposed at the center of the fluid tube and communicates axially with the fluid tube. The upper part of the flow control tube 20 is a solid cylinder. At the joint of the current sensing tube and the flow control tube, a valve seat 21 is formed by two cylindrical holes intersecting each other. A cylindrical valve core 22 is provided in the current-sensing tube to slidably cooperate with the valve seat to open and close. The current-sensing tube has a spiral return spring 23 on each side of the valve core 22, so that the current-sensing device has a bidirectional flow-sensing function for the forward and reverse fluid. It is also possible to install a return spring 23 on only one side of the valve element. Such a crusted current sensor has a unidirectional flow sensing function. The current-sensing tube of the current sensor] 9 is installed in the fluid tube 2, preferably at the center of the streamline, and the flow-control tube 20 extends upward through the fluid tube, the cavity 15 of the base and the tube hole to reach the storage pressure. The cylinder cavity of the cylinder 16 and the solid cylindrical part of the flow control tube 20 extend upwards and pass through the pressure storage cylinder. A common seal is installed between the flow control pipe and the base pipe hole and the cylinder shell of the pressure storage cylinder to prevent fluid from leaking out. An elongated through-hole 24 extending along the axis of the flow control tube is formed on the wall of the flow control tube 20 and communicates with the lumen of the flow control tube. When the flow control tube moves up and down with the flow sensor 18, the pressure storage cylinder should be maintained 16 communicates with the flow control tube through the through hole 24, so that the flow control tube 20 communicates with the control cylinder 4 through the pressure storage cylinder 16. The hydraulic cylinder 25 is a conventional cylindrical hydraulic cylinder. The hydraulic cylinder is placed on the pressure storage cylinder and is made into an integrated crust with the pressure storage cylinder 16. The piston 26 in the hydraulic cylinder is connected to the solid cylindrical part of the flow control tube 20 of the flow sensor 18, and the flow control tube is not in communication with the hydraulic cylinder. In the hydraulic cylinder, the upper cavity 27 is above the piston 26. The lower cavity 28 is below the piston. Both the upper cavity and the lower cavity of the hydraulic cylinder are provided with a cylinder port. The side of the hydraulic cylinder is fixedly integrated with the control cylinder 4.

The bypass valve 29 is a two-position multi-port piston valve, which has a cylindrical casing and a cylindrical spool 34 which reciprocates in the casing, and is placed on the fluid pipe 2 on the upstream side of the main valve 1. An upper cavity connection 30, a lower cavity connection 31, a fluid pipe connection 32 and an atmospheric connection 33 are formed on the bypass valve housing. The pass valve core 34 in the housing is fixedly connected to the round rod-shaped pass valve stem 35, and the lower end of the pass valve stem 35 extends into the fluid pipe at an appropriate depth, and is installed so that the traveling pig 58 can push the pass valve stem Thereby, the spool 34 is passed. A sealing crust should be provided between the passage valve stem 35 and the fluid pipe 2. The bypass valve core 34 is formed with a passage 36 that can connect the lower cavity interface 31 and the fluid pipe interface 32 when it is placed on the upper cavity of the bypass valve, and can connect the upper cavity interface 30 and the atmospheric interface 33 at the same time. The relief valve 37 of the bypass valve 34 is also formed with a reset channel 38 that can connect the upper cavity interface 30 and the fluid pipe interface 32 when it is placed in the lower cavity of the bypass valve, and can also connect the lower cavity interface at the same time. 31 With the pressure relief channel 39 of the atmospheric interface 33. The upper cavity interface 30 is connected to the upper cavity 27 of the hydraulic cylinder 25 and the cylinder port 11 of the control cylinder 4 through a pipeline 40. The lower cavity connection 31 is connected to the lower cavity 28 of the hydraulic cylinder by a line 41. The fluid pipe interface 32 is connected to the fluid pipe 2 through a pipeline, and the atmospheric interface 33 can be connected to the atmosphere through the pipeline or a reservoir 42 is arranged below the pipeline, so that the hydraulic cylinder 25 can be communicated with the fluid pipe or the atmosphere by using a bypass valve. Two-way control valves can be installed on the cylinder ports of the upper and lower chambers of the hydraulic cylinder or on the corresponding pipelines. The two-way regulating valve can be an existing differential flow adjustable shuttle valve of the present inventor, which is used for regulating the forward and reverse fluid flow in the pipeline. The scoop of the bypass valve can also be a two-position multi-port valve with the spool rotating. When using this scaffold, the normal spool drive should be used accordingly.

The hydraulic holding cylinder 43 is a traditional cylindrical piston hydraulic cylinder structure, which is stacked on the top of the through valve 29 to form an integrated structure. The two share a common shell and are separated by a partition plate 44. The hydraulic holding cylinder 43 and the port valve 29 may be separated. The holding piston 45 of the hydraulic holding cylinder is connected to the bypass spool 34 of the bypass valve by a connecting rod 46 extending downward through the partition plate 44. There should be a sealing scab between the connecting rod 46 and the partition 44. In the cylinder chamber above the holding piston 45, a return coil spring 47 is provided.

The reset valve 48 is a two-position three-way piston valve, which has a cylindrical casing and a cylindrical valve core 49 that reciprocates in the casing, and is placed on the fluid pipe 2 on the upstream side of the main valve 1. Reset valve The front end of the round rod-shaped reset valve stem 50 to which the core 49 is connected extends into the fluid pipe at an appropriate depth, and is arranged so that the traveling pig 58 can push the reset valve stem 50 to reset the valve core 49. A sealing crust should be provided between the reset valve stem 50 and the fluid pipe. At the lower part of the reset valve housing, an atmospheric port 51 is formed, which communicates with the valve cavity below the reset valve core. At the upper part, a cylinder port 52 is formed, which communicates with the valve cavity above the reset valve core. When the lower part is closed, the air port 51 is connected to the cylinder port 52 through the valve cavity above the reset valve core, and when the reset valve is placed in the middle and the cylinder port 52 is closed, the air chamber 51 is connected to the air port 51 through the valve cavity below the reset valve core.的口口 53。 The cylinder port 53. The cylinder port 52 is connected to the lower chamber 28 of the hydraulic cylinder 25 by a pipeline 54, and the cylinder port 52 may also be directly connected to the lower chamber interface 31 of the access valve 29 by a pipeline 54. The cylinder port 53 is connected to a cylinder cavity below the holding piston 45 of the hydraulic holding cylinder 43 through a pipeline 55. A coil spring 56 for resetting is provided in a valve chamber above the reset valve core 49 of the reset valve 48. There may be a reservoir 57 below the atmospheric port 51.

The protection device of the present invention is particularly suitable for pipeline blasting leakage in long-distance pipelines for fluid transportation. The fluid pressure pipe is self-closed; the same is particularly suitable for passing pigs 58 when cleaning fluid pipelines.

When the protection device of the present invention is in a working state for conveying fluid, the main valve 1 is fully opened, the valve core 22 of the current sensor 18 and the valve seat 21 are closed and matched, that is, the current sensor is closed, and the control piston 5 in the control cylinder 4 It is placed in the right part of the cylinder body, and the solenoid valve controlling the red port 10 of the cylinder 4 is in a closed state, that is, the cylinder port 10 is closed.

When the protection device of the present invention is in a working state for conveying fluid, the passing spool 34 of the passing valve 29 and the holding piston 45 in the hydraulic holding cylinder 43 connected via the connecting rod 46 are placed at the lower part of the inner cavity of the respective housing. The through valve stem 35 extends into the fluid pipe 2 at a proper depth, and the reset channel 38 on the through valve core connects the fluid pipe interface 32 with the upper cavity interface 30, so that the fluid pipe 2 passes the through valve, the pipeline 40 and the hydraulic cylinder. The upper cavity 27 of 25 is communicated, so that the pressure of the upper cavity of the hydraulic cylinder is approximately the same as the pressure of the fluid pipe; the pressure relief channel 39 connects the lower cavity interface 3 1 with the atmospheric interface 33, so that the lower cavity of the hydraulic cylinder is connected via the pipeline 41 28 communicates with the outside atmosphere, so that the pressure in the lower chamber is atmospheric pressure, that is, the pressure in the upper chamber 27 is greater than the pressure in the lower chamber 28. The reset wide core 49 of the reset valve 48 is placed at the lower part of the inner cavity of the housing, and the reset valve stem 50 projects into the fluid pipe 2 to an appropriate depth. The valve cavity above the reset valve core communicates with the lower cavity 28 of the hydraulic cylinder and the cylinder cavity below the holding piston 45 of the hydraulic holding cylinder 43 through the cylinder port 52 and the cylinder port 53 respectively. The valve core 22 of the current sensor 18 and the valve seat 21 are closed and matched, that is, the current sensor is closed. The cylinder port 9 on the right end of the control cylinder 4 is closed due to the current sensor being closed, and the cylinder port 10 is closed. The cylinder port 1 on the left end is connected to the fluid pipe 2 through the pipeline 40, the reset channel 38 of the access valve, and the fluid in the fluid pipe. Access valve The fluid pipe interface 32 of 29, the reset channel 38, and the upper cavity interface 30 enter the pipeline 40, and the fluid entering the pipeline 40 is then divided into two paths: one way enters the upper cavity 27 through the cylinder port of the hydraulic cylinder 25, so that the piston 26 is placed at the The lower part of the hydraulic cylinder, so as to ensure that the current sensing tube 19 of the current sensor 18 is located at the center of the flow line of the fluid tube; the other path, the cylinder port 11 enters the left end of the control cylinder 4, and the control piston 5 is placed in the cylinder block. Inside right, ensure that the main valve 1 is fully open.

When the fluid tube leaks due to blasting, the flow velocity of the fluid in the fluid tube increases sharply, and the high-speed fluid impacts the valve core 22 in the current sensor. Whether the fluid in the fluid pipe 2 flows from left to right in the forward direction or from the right to the left in the reverse direction, whether it is a fluid pipe burst leak at the right end of the main valve 1 or a fluid pipe burst leak at the left end of the main valve, protection The devices can achieve pipeline protection. When the fluid flows forward, the high-speed fluid enters the sensor 18 from the left end, pushes the spool 22 to the right, and compresses the return spring 23 on the right side of the spool; when the fluid flows in the reverse direction, the high-speed fluid enters the sensor from the right end 18. Push the spool 20 to the left and compress the return spring 23 on the left side of the spool. The above-mentioned high-speed fluid in both the forward and reverse directions can open the valve core and the valve seat, that is, the current sensor 18 is opened. The fluid enters the pressure storage cylinder 16 through the sense tube 19, the valve seat 21, and the control tube 20 and compresses the airbag 17 in the pressure storage cylinder. The fluid entering the pressure storage cylinder passes through the pipeline 60 and the control port 9 to the control cylinder. At the same time, the kinetic energy of the fluid in the center of the streamline in the fluid pipe is greater than the kinetic energy of the boundary fluid, so the piston 5 is controlled to go left and press under the pressure difference between the fluid in the right and left cylinders. The spring 6 is contracted, so the fluid in the left-end cylinder cavity of the control cylinder 4 is discharged into the fluid pipe 2 through the cylinder port 11, the pipeline 40, and the reset channel 38 of the access valve 29. As a result, the control rod 7 follows the control piston 5 to the left, and the gear 13 is driven by the rack 8 on the control rod so that the main valve rod 3 rotates, and the main valve 1 is closed. During the closing process of the main valve, the flow velocity and pressure in the fluid pipe gradually decrease, and the valve core 22 of the current sensor 18 is gradually closed by the action of the return spring 23. When the pressure in the right cavity of the pressure storage cylinder 16 and the control cylinder 4 decreases, the airbag 17 releases the pressure and expands, and presses the fluid in the pressure storage cylinder into the control cylinder to further advance the control piston 5 to ensure the reliability of the main valve. The ground is completely closed and the fluid in the fluid pipe is cut off to achieve pipeline protection. At this time, the valve core 22 in the current sensor 18 is reset by the return spring 23, the valve core 22 and the valve seat 21 are closed, and the current sensor 18 is closed. When the pipeline is repaired, the right cylinder port 10 of the control cylinder is opened under the control of the solenoid valve, and the cylinder port 9 is closed due to the closing of the current sensor. The control piston 5 moves to the right under the action of the return spring 6, so that the fluid in the right-hand end of the cylinder 4 is discharged into the fluid pipe 2 through the cylinder port 10 and the pipeline 12. At the same time, the pressure fluid in the fluid pipe 2 passes through the passage valve. The reset channel 38, the pipeline 40, and the cylinder port 11 at the left end of the control cylinder enter the left end cylinder cavity of the control cylinder 4. As a result, the control rod 7 returns to the right, the rack 8 on the control rod drives the gear 13 in the reverse direction so that the main valve rod 3 is reversed, the main valve 1 is reset and opened until it is fully opened, and the system recovers. The working state of the fluid is returned, and the cylinder port 10 of the control cylinder 4 is closed under the control of the solenoid valve. FIG. 2 shows a state in which the fluid transfer line is cleaned by the pig 58. When the pig 58 travels from left to right to the through valve 29 on the upstream side of the main valve 1, the through valve stem 35 is pushed up, so that the through valve core 34 is raised to the upper part of the inner cavity of the housing, and the hydraulic holding cylinder is connected through the connecting rod 46 The holding piston 45 of 43 rises to the upper part of the housing cavity. The reset channel 38 and the pressure relief channel 39 on the bypass spool 34 are cut off at the same time, while the flow channel 36 connects the fluid pipe interface 32 and the lower cavity interface 31, and the same pressure relief channel 37 connects the upper cavity interface 30 and the atmospheric interface 33 Connected. The pressure fluid in the fluid tube 2 enters the lower cavity 28 of the hydraulic cylinder 25 through the fluid tube interface 32, the passage 36, the lower cavity interface 31, and the pipeline 41 of the bypass valve, so that the fluid pressure in the lower cavity and the fluid tube 2 At the same time, the cylinder port 11 of the control cylinder 4 is closed under the control of a solenoid valve or a reverse damping regulating valve, and the fluid in the upper chamber 27 of the hydraulic cylinder is discharged through the pipeline 40, the upper chamber interface 30 of the bypass valve, and drained. The pressure channel 37 and the air interface 33 are connected to the outside atmosphere, so that the pressure in the upper chamber 27 of the hydraulic cylinder is atmospheric pressure, that is, the pressure in the lower chamber of the hydraulic cylinder is greater than the pressure in the upper chamber. At this time, the reset valve stem 50 of the reset valve 48 still extends into the fluid pipe 2, and the reset valve core 49 of the reset valve 48 is still placed in the lower part of the inner cavity of the housing. A small amount of pressure fluid entering the lower chamber 28 of the hydraulic cylinder enters the cylinder below the holding piston 45 of the hydraulic holding cylinder 43 through the line 54, the cylinder port 52 of the reset valve, the valve cavity above the reset spool, the red port 53 and the line 55. Cavity, so that the holding piston and the passing spool 34 of the connecting valve connected to the holding piston via the connecting rod 46 are maintained at the upper positions of the inner chambers of the respective housings, so as to keep the flow path of the fluid pipe 2 to the lower chamber 28 of the hydraulic cylinder in a path state . The pressure fluid in the fluid tube 2 continuously enters the lower cavity 28 of the hydraulic cylinder, and the piston 26 is pushed up by the fluid to be placed in the upper part of the hydraulic cylinder, and the fluid is lifted by the control tube 20 of the current sensor 18 and caused to flow. The flow-sensing tubes 19 all enter the cavity 15 of the base 14 to allow the moving pig to pass smoothly. At this time, the system is in a pig-passing state.

When the pig 58 travels to the reset valve 48 on the upstream side of the main valve 1, the reset valve stem 50 is pushed up, the reset valve core 49 is moved upward, and the spring 56 is compressed to place the reset valve core 49 in the middle of the reset valve. The cylinder port 52 is blocked by the reset valve core, and the cylinder port 53 is connected to the atmospheric port 51 through the valve cavity below the reset valve core. The fluid in the cylinder cavity below the holding piston 45 in the hydraulic holding cylinder 43 is discharged from the atmospheric port 51 or into the reservoir 57 through the pipeline 55, the cylinder port 53 of the reset valve, and the valve cavity below the reset valve core, and the hydraulic retention Cylinder pressure relief. Under the action of the spring 47, the holding piston 45 goes down and resets, and the passing spool 34 of the going valve 29 is driven by the connecting rod 46 to go down and reset. After the pass valve 29 is reset, the piston 26 in the hydraulic cylinder 25 is reset downward, and then the inductor is driven to reset by the flow control tube 20 of the current sensor 18, and the reset valve core 49 is also reset downward by the spring 56 . The system restores the working state of fluid delivery, and the cylinder port 11 of the control cylinder is opened under the control of a solenoid valve or a reverse damping regulating valve. According to this embodiment, since the cylinder port 10 of the control cylinder 4 is connected to the fluid pipe 2 through the pipeline 12, its special advantage is: during operation, the fluid in the right-side cylinder cavity of the control cylinder 4 is discharged into the fluid pipe 2 without The fluid will be discharged to the outside world, so as to prevent the fluid from polluting the environment and reduce the loss of fluid discharge. As an alternative, the pipeline 12 connected to the cylinder port 10 of the control cylinder 4 can communicate with the atmosphere, or a reservoir is installed at the outlet of the pipeline, so that the fluid discharged from the control cylinder is discharged into the reservoir. With this structure, when the control cylinder is reset after the pipeline is repaired, the pressure in the cylinder cavity at the right end of the control cylinder is atmospheric pressure, which makes the reset more reliable, but a small amount of fluid discharged from the pipeline 12 is lost.

Example 2

A second embodiment of the self-supporting ball-type pipeline blast protection device of the present invention is shown in FIG. 3, and its structure is basically the same as that of embodiment 1, and its operation is also basically the same.

The crusting characteristics of the self-supporting ball-type pipeline blasting protection device of this embodiment are as follows: a current sensor 18 is provided in the main valve 1, and a pressure storage cylinder 16 and a hydraulic cylinder 25 are stacked on the main valve 1 to form an integrated crust. The control cylinder 4 is fixedly connected with the upper left end of the main valve and the pressure storage cylinder by a common structure. The main valve 1 can be a ball valve, a butterfly valve or a gate valve. When a ball valve is used, a concave cavity 15 is formed at the top of the inner cavity flow path of the main valve core 59 having a spherical shape, which can accommodate the current sensing tube 19 of the current sensor 18. The main valve stem 3 of the main valve is made into a circular tube shape, and the lumen of the circular tube penetrates the flow path of the main valve core 59. The flow control tube of the current sensor is slidably fitted in the lumen of the main valve stem, and a sealing structure is provided between the flow control tube and the lumen.

The present invention has been described above with reference to the drawings and embodiments. However, those skilled in the art should understand that the above embodiments are only used to illustrate the present invention and not to limit the present invention. Various modifications and improvements can be made to the present invention without departing from the spirit and scope of the present invention. As an alternative, the cylinder port 11 of the control cylinder 4 may directly communicate with the fluid pipe through a pipeline; in addition, the control cylinder 4 may not be provided with the cylinder port 11. In addition, the pressure storage cylinder 16 may not be provided, and the flow control pipe 20 may be directly communicated with the control cylinder through the cylinder port 9 of the control cylinder 4.

Claims

Profit requirements

1. A self-supporting ball-type pipeline blast protection device, comprising:

The main valve (1) and a first controller for controlling the opening and closing of the main valve, the main valve (1) has a valve body communicating with the fluid pipe (2), a ten main valve core arranged on the valve body, and The main valve stem is associated with the main valve stem (3);

It is characterized in that the first controller includes:

A first piston-type hydraulic control cylinder (4), a control rod (7) connected to a control piston (5) provided in the cylinder body of the hydraulic cylinder is connected with the main valve rod (3) for driving, The linear reciprocating movement of the piston is converted into the opening and closing movement of the main spool; the cylinder cavity of the first hydraulic cylinder is divided into a first cavity and a second cavity by the piston, and the first cavity is provided with A return spring (6) for resetting the control piston (5)> the second cavity is formed with a first cylinder port (10) for discharging a fluid therein, and a control valve is provided to control the flow in the second cavity Discharge via the first cylinder port;

A current sensor (18), configured to sense the flow velocity of the fluid in the fluid tube, and control the communication between the fluid tube and the second cavity of the hydraulic cylinder according to the flow velocity of the fluid in the fluid tube; When the flow velocity of the fluid exceeds a preset flow velocity value, the flow sensor communicates the fluid tube with the second cavity of the hydraulic cylinder; the flow sensor (15) may be located at the first position in the fluid tube. Moving between a position and a second position removed from the fluid tube;

2. The self-supporting ball-type pipe blast protection device according to claim 1, wherein the current sensor includes a current sensing tube (19) and a flow control tube connected to the current sensing tube via a valve seat (21). (20), the current sensing tube is provided with a valve core (22) that cooperates with the valve seat and a return spring (23) for resetting the threshold core (22). The current sensing tube is arranged in the fluid tube (2) and It communicates with the flow channel of the fluid tube, and the flow control tube communicates with the second cavity of the hydraulic cylinder. When the flow velocity of the fluid exceeds a preset flow velocity value, the valve core and the valve seat are in an open state.

3. The self-supporting ball-type pipe blast protection device according to claim 2, characterized in that the current sensor (18) is disposed in a main valve core (59), and the current control tube of the current sensor (59) 20) Extending through the tubular main valve stem (3) along the axis and movable relative to the main valve stem.

4. The self-supporting ball type pipe blast protection device according to claim 2, further comprising a pressure storage cylinder (16), and a second cylinder port (9) is formed in a second cavity of the second hydraulic cylinder. , Pressure storage cylinder and The control pipe (20) communicates with the second cavity of the first hydraulic cylinder (4) through the second cylinder port (9), and an airbag (17) is installed in the pressure storage cylinder. A reverse damping regulating valve is provided on a connection path between the second cavity of the first hydraulic cylinder (4) and the pressure storage cylinder (16).

5. The self-supporting ball-type pipeline blast protection device according to claim 2, wherein a third cylinder port (11) is formed in a first cavity of the first hydraulic cylinder, and the third cylinder port and The fluid tube (2) is in communication, and a reverse damping regulating valve or a solenoid valve is provided in the third cylinder port or on a pipeline connecting the third cylinder port and the fluid tube, and the current sensing tube (19;) is located in the fluid tube (2) Approximately center position.

6. The self-supporting ball-type pipe blast protection device according to any one of claims 1 to 5, wherein the first cylinder port (10) is in communication with a fluid pipe via a pipeline (12).

7. The self-supporting ball-type pipeline blast protection device according to any one of claims 1 to 5, wherein the control valve is a solenoid valve or a manual valve.

8. The self-supporting ball type pipe blast protection device according to any one of claims 1 to 5, characterized in that the flow sensing tube (19) is provided along the flow line of the fluid in the fluid tube (2) and It is T-shaped connected with the flow control tube (20).

9. The self-supporting ball type pipe blast protection device according to any one of claims 1 to 5, wherein a rack (7) is formed on a control rod (7) of the first hydraulic cylinder (4). 8), the rack gear meshes with a gear (13) mounted on a main valve stem (3) of the main valve (1).

10. The self-supporting ball-type pipe blast protection device according to claim 1, characterized in that the control device for controlling the movement of the current sensor includes:

A second hydraulic cylinder (25) comprising a piston (26) arranged in a cylinder body of the second hydraulic cylinder and a piston rod connected to the piston, the piston rod being drivingly connected with the current sensor (18) for driving Current sensor (18) moves the current sensor;

A bypass valve (29), which is arranged on a pipeline connecting a fluid pipe and a second hydraulic cylinder; and

A second controller is used to control the operation of the pass valve so as to control the reciprocating movement of the second hydraulic cylinder piston (26) by using the pressure fluid in the fluid pipe (2).

11. The self-supporting ball-type pipeline blast protection device according to claim 10, wherein the access valve (29) is used to control two chambers (27, 28) separated by a piston of the second hydraulic cylinder ) And the fluid pipe and the atmosphere, the bypass valve spool (34) can enter its second working position by activating the second controller, and when the bypass valve spool is located in the second working position, the fluid pipe and the The first chamber (28) of the hydraulic cylinder is in communication, and the second chamber (27) is in communication with the atmosphere; The two controllers return to their first working position. When the spool of the access valve is located at the first working position, the fluid pipe is in communication with the second chamber (27) of the second hydraulic cylinder, and the first chamber (28) is in communication with the atmosphere. .

12. The self-supporting ball-type pipeline blast protection device according to claim 11, wherein the second controller comprises a bypass valve stem (35) connected to the spool of the bypass valve, and the spool is located at the bypass valve spool. When in its second working position, the end of the pass valve stem facing away from the pass valve spool extends into the fluid pipe (2), and is so arranged that the moving pig (58) can push the pass valve stem outside to pass The valve spool moves to its first working position; the controller further includes a hydraulic holding cylinder (43) and a reset valve (48) operatively connected to the access valve (29), the reset valve is disposed downstream of the access valve A reset valve stem (50) is connected to the reset valve stem (49) of the reset wide valve (48), and the reset valve spool (49) together with the reset valve stem is biased to its first working position by a spring (56). In the first working position, the end of the reset valve stem facing away from the reset valve spool extends into the fluid pipe (2), and is arranged in such a way that the moving pig (58) can overcome the bias of the spring and push the reset valve outward. Lever to switch the reset valve spool to its second working position; at the pass valve spool 34) is pushed out to its second working position by the pig, the second controller is activated, and the hydraulic holding cylinder (43) communicates with the fluid pipe (2) through the reset valve and the access valve, so as to connect the access valve The core remains in its second working position; when the reset valve (48) is pushed out to its second working position by the pig, the controller is deactivated, and the hydraulic holding cylinder (43) passes through the reset valve and passes The valve is in communication with the atmosphere, and the bypass valve spool returns to its first working position.

13. The self-supporting ball-type pipeline blast protection device according to claim 12, wherein the pass valve (29) is a two-position four-way valve, and the reset valve is a two-position three-way valve. .

14. The self-supporting ball-type pipeline blast protection device according to claim 11, characterized in that the pipelines (40, 41) between the second hydraulic cylinder (25) and the access valve (29) are provided Two-way control valve.

15. The self-supporting ball type pipe blast protection device according to claim 10, wherein the piston rod of the second hydraulic cylinder (25) is the same as the flow control tube (20) of the current sensor (18). The axis is coupled and integrated with the flow control tube.

16. The self-supporting ball-type pipeline blast protection device according to claim 11, characterized in that a first cavity of the first hydraulic cylinder (4) is formed with a third cylinder port (11) '' the third cylinder The port communicates with the second cavity (27) of the second hydraulic cylinder via a pipeline, and the third cylinder port (11) is equipped with an electromagnetic wide or reverse damping regulating valve.