A burst protection emergency shut-off valve for long water supply pipelines

Abstract

This invention relates to the field of emergency shut-off valve technology, and in particular to an emergency shut-off valve for pipe burst protection in long water supply pipelines. The valve includes a butterfly valve connected to the outlet end of a flow meter section; a crank arm fixedly connected to the valve stem of the butterfly valve, and the crank arm rotating within a support; a counterweight at one end of the crank arm, and a hinged connection at the other end to the output end of a drive device; a drive device for driving the crank arm to rotate, causing the counterweight to move to the locking position of a locking and releasing assembly; a locking and releasing assembly, located on the support, for locking or releasing the counterweight; and a flow velocity sensing assembly located on the flow meter section. When the flow velocity exceeds a preset threshold, the hydraulic pressure within the pipeline triggers the locking and releasing assembly to unlock, causing the counterweight to rotate under gravity, thus rapidly closing the butterfly valve. This emergency shut-off valve achieves purely mechanical flow velocity sensing triggering, gravity-driven shut-off, and automatic locking, with rapid response and stable operation.

Description

Technical Field

[0001] This invention relates to the field of emergency shut-off valve technology, and in particular to an emergency shut-off valve for pipe burst protection in long water supply pipelines. Background Technology

[0002] Emergency shut-off valves are key equipment used for pipe burst protection in water transmission and distribution pipelines. When a pipe burst occurs downstream, they can quickly cut off the upstream water source, minimizing the leakage. These valves are suitable for long-distance water transmission pipelines and urban water supply networks, serving as a core device for ensuring water supply safety. They are widely used in municipal water supply, inter-regional water transfer, and other engineering projects.

[0003] Existing pipe burst shut-off valves suffer from numerous technical defects: The current valve actuation methods result in slow and unstable shut-off actions, failing to meet the stringent timeliness and reliability requirements of pipe burst protection. Traditional valves generally rely on external power sources such as electricity or pneumatic / hydraulic systems for shut-off. However, long-distance pipelines commonly suffer from unstable power supply issues, and laying power lines in buried sections of urban pipelines is extremely difficult. This dependence on external power significantly reduces system reliability; a power outage will directly lead to complete valve failure. Furthermore, the complex power transmission links and lengthy response chains further affect shut-off performance. Pneumatic / hydraulic linkage valve actuators inherently suffer from delayed pneumatic-hydraulic conversion and slow pipeline pressure build-up. The time required from triggering a pipe burst signal to complete valve closure is considerable, causing continuous leakage of large amounts of water and exacerbating accident losses.

[0004] Therefore, the present invention provides an emergency shut-off valve for rupture protection of long water supply pipelines to solve the problems mentioned in the background art. Summary of the Invention

[0005] The purpose of this invention is to provide an emergency shut-off valve for pipe burst protection in long water supply pipelines, so as to solve the problems of slow response time and poor stability of existing pipe burst shut-off valves, which make it difficult to meet the strict requirements of timeliness and reliability for pipe burst protection.

[0006] To address the aforementioned technical problems, this invention provides an emergency shut-off valve for pipe burst protection in long-distance water supply pipelines. The valve includes a butterfly valve connected to the outlet end of a flowmeter pipe section; a crank arm fixedly connected to the valve stem of the butterfly valve, and the crank arm rotating within a support; a counterweight at one end of the crank arm, and a hinged connection at the other end to the output end of a drive device; a drive device for driving the crank arm to rotate, causing the counterweight to move to the locking position of a locking release assembly; a locking release assembly, located on the support, for locking or releasing the counterweight; and a flow velocity sensing assembly located on the flowmeter pipe section, connected to the locking release assembly via a pipeline, for real-time monitoring of the fluid velocity within the pipeline. When the detected flow velocity exceeds a preset threshold, the hydraulic pressure within the pipeline triggers the locking release assembly to unlock, causing the counterweight to rotate under gravity, thereby rapidly closing the butterfly valve.

[0007] A further improvement of the technical solution of the present invention is that the flow velocity sensing component also includes a flange seat, which is a blind flange structure with a closed top. Its bottom flange face is sealed to the top flange of the flange connecting pipe. The flange connecting pipe is vertically arranged at the top of the flow meter pipe section and communicates with the inner cavity of the pipe section.

[0008] A further improvement of the technical solution of the present invention is that: a shaft is transversely provided through the side wall of the flange seat, the shaft is rotatably sealed with the two side walls of the flange seat, the two ends of the shaft extend out of the outside of the flange seat and are respectively fitted with a stroke limit cam and a connecting rod; a connecting ring is fixedly fitted in the middle of the inner cavity of the flange seat, the connecting ring extends downward and is provided with a connecting column, the lower part of the connecting column is fixedly connected with a water-facing plate, and the water-facing plate is suspended in the inner cavity of the water-facing side of the flow meter pipe section.

[0009] A further improvement of the technical solution of the present invention is as follows: a balancing mechanism and a reversing valve are fixedly installed on both sides of the top of the flange seat. The balancing mechanism includes a housing, a top cover is provided on the top of the housing, a spring seat is provided at the bottom of the cavity of the housing, a first spring is fixed on the spring seat, the top of the first spring abuts against a spring compression cover, an adjusting screw is provided in the middle of the top surface of the spring compression cover, the adjusting screw extends upward out of the top cover and is screwed with a nut; a limiting post is provided in the center of the bottom surface of the spring seat, the limiting post extends downward out of the housing and contacts the upper end surface of the connecting rod to limit the rotation angle of the connecting rod.

[0010] A further improvement of the technical solution of the present invention is as follows: the reversing valve includes a valve body, and an end cover is fixedly installed on the top of the valve body; the valve body has a through-type valve core cavity opened axially, and a valve core with coaxial sliding fit is set in the valve core cavity; a third spring is coaxially snapped onto the outer periphery of the upper part of the valve core rod, and the third spring provides the valve core with an axial downward reset thrust; an adjusting pad is set at the top of the third spring, and the top surface of the adjusting pad abuts against the bottom surface of the adjusting rod; the top of the valve core is embedded in the adjusting cavity at the bottom end of the adjusting rod, and can slide axially in the adjusting cavity; the adjusting rod extends upward through the end cover and is locked and positioned by a locking nut; the lower part of the side wall of the valve body has radially symmetrically opened inlet and outlet, and both inlet and outlet are connected to the valve core cavity; when the valve core slides axially, the on / off state of the inlet and outlet is switched to realize the flow path on / off; the valve core extends downward through the valve body and abuts against the trigger protrusion contour of the outer periphery of the stroke limit cam; when the stroke limit cam rotates, it pushes the valve core to move axially upward through the trigger protrusion.

[0011] A further improvement of the technical solution of the present invention is that: the water inlet is connected to the water inlet end of the flow meter pipe section side wall through a pipeline; the water outlet is connected to the locking and releasing component through a pipeline.

[0012] A further improvement of the technical solution of the present invention is as follows: a vertical mounting plate is provided on the support, and a locking and releasing assembly is provided on the side of the mounting plate near the butterfly valve. The locking and releasing assembly includes a housing, a cover plate is provided at the front end of the housing, and the cover plate is fixedly installed on the mounting plate. A pressure inlet and a drain outlet are provided at the rear end of the housing. The pressure inlet is connected to the outlet through a pipeline. An annular protrusion is provided in the middle of the inner cavity of the housing. The outer edge of an annular diaphragm is fixedly connected to the inner wall of the annular protrusion. A circular mounting block is connected to the inner edge of the annular diaphragm. An unlocking rod is fixedly provided axially at the center of the mounting block. The unlocking rod extends horizontally forward and slides through the cover plate. The annular diaphragm divides the inner cavity of the housing into a front cavity and a rear cavity. Both the pressure inlet and the drain outlet are connected to the rear cavity. When pressurized water from the pipeline enters the rear cavity through the pressure inlet, the annular diaphragm is deformed by pressure, causing the mounting block and the unlocking rod to move forward.

[0013] A further improvement to the technical solution of this invention is as follows: the crank arm includes a horizontal arm and an inclined arm connected to the horizontal arm and tilting upwards. The horizontal arm and the inclined arm are integrally formed, with a rounded transition at the connection point. Mounting holes are provided at the connection point of the horizontal arm and the inclined arm, and the mounting holes fit and fix the rotating shaft. The valve shaft of the butterfly valve is coaxially and fixedly connected to the rotating shaft. Both ends of the rotating shaft are rotatably connected to the support. A counterweight is provided at the front end of the horizontal arm, consisting of two sets of counterweights symmetrically arranged at the front end of the horizontal arm, each set containing at least one counterweight. The counterweights are attached to the side surface of the horizontal arm and fastened by transversely penetrating bolts. The free end of the inclined arm is connected to a driving device, which includes a hydraulic cylinder. The end of the piston rod of the hydraulic cylinder is hinged to the free end of the inclined arm, and the cylinder body of the hydraulic cylinder is fixed to the support. The hydraulic cylinder is connected to a hydraulic pump station, which is located on the side wall of the support, opposite to the counterweight. The hydraulic pump station is connected to the hydraulic cylinder via a high-pressure hose.

[0014] A further improvement of the technical solution of the present invention is as follows: a locking component is provided in the middle of the top surface of the horizontal arm. The locking component includes a gate-shaped block, and a cylinder is fixedly fixed through the upper part of the gate-shaped block. The cylinder has a receiving cavity that opens towards the butterfly valve side and a mounting through hole provided on the side away from the butterfly valve. The mounting through hole communicates with the receiving cavity and its diameter is smaller than the diameter of the receiving cavity. A mounting post is inserted into the mounting through hole. An adjusting nut is threaded to the outer end of the mounting post. The inner end of the mounting post extends into the receiving cavity and is fixedly connected to one end of the movable post. A second spring is fitted on the post body located in the receiving cavity. One end of the second spring is fixedly connected to the bottom surface of the receiving cavity, and the other end elastically abuts against the inner end face of the movable post. The movable post can slide axially along the receiving cavity under the elastic force of the second spring, and its outer end extends out of the opening end of the receiving cavity.

[0015] A further improvement of the technical solution of the present invention is that: a trapezoidal block is provided on the side of the mounting plate facing the crank arm; a locking hole is provided on the trapezoidal block through the mounting plate, and a guide slope is provided on one side of the trapezoidal block; the protruding end of the movable column cooperates with the guide slope and the locking hole. When the movable column slides along the guide slope to the locking hole, a locking state is achieved. When the flow meter pipe section bursts, the unlocking rod extends into the locking hole and pushes the movable column in the locking hole, causing the movable column to disengage from the locking hole. Under the action of gravity, the counterweight drives the crank arm to rotate, thereby achieving rapid closure of the butterfly valve.

[0016] By adopting the above technical solution, the present invention has the following beneficial effects: 1. This invention provides an emergency shut-off valve for pipe burst protection in long-distance water supply pipelines. This emergency shut-off valve achieves mechanical pipe burst detection and rapid shut-off through the linkage of a flow velocity sensing component, a locking release component, a counterweight, and a crank arm transmission mechanism, overcoming the technical shortcomings of traditional valves that rely on external power sources. Specifically, the flow velocity sensing component is installed on the flow meter section and can sense changes in fluid velocity within the pipeline in real time. When a pipe burst causes an abnormal increase in flow velocity exceeding a preset threshold, the hydraulic pressure within the pipeline directly triggers the locking release component to unlock, allowing the counterweight to instantly rotate the crank arm under gravity, thus closing the butterfly valve. This eliminates the dependence on external power sources such as electricity or pneumatic / hydraulic systems, solving the shut-off failure problem caused by power interruption in traditional products, while also avoiding the poor reliability of pneumatic / hydraulic linkage actuators.

[0017] 2. This invention provides an emergency shut-off valve for pipe burst protection in long-distance water supply pipelines. Through a flow velocity sensing component, it achieves accurate identification and reliable triggering of pipe burst accidents. This design uses flow velocity as a direct detection parameter. A water-receiving plate is suspended in the inner cavity of the flowmeter pipe section on the water-receiving side to sense changes in the fluid state within the pipeline in real time. When a pipe burst occurs, the displacement of the water-receiving plate drives a stroke-limiting cam to rotate rapidly via a shaft, pushing the valve core upwards to overcome the resistance of the third spring, accurately switching the flow path state, and then triggering the locking and releasing component to cause the counterweight to quickly shut off the butterfly valve. Simultaneously, the balancing mechanism, through the cooperation of the first spring, spring pressure cover, and adjusting screw, provides an adjustable resistance torque to the connecting rod, allowing the system to set a trigger threshold according to the actual operating parameters of the pipeline. This effectively filters flow velocity fluctuations under normal operating conditions, triggering the reversing valve only when a pipe burst actually causes an abnormal surge in flow velocity, thereby significantly reducing the false trigger rate and ensuring the accuracy and timeliness of the shut-off.

[0018] 3. This invention provides an emergency shut-off valve for pipe burst protection in long-distance water supply pipelines. This device, through the coordinated arrangement of a locking and releasing component and a locking component, achieves stable maintenance of the hammer's locked state and instantaneous release in the event of a pipe burst, thereby ensuring reliable shut-off of the butterfly valve. Specifically, the locking component's portal block, cylinder, movable column, and second spring constitute an elastic telescopic locking tongue structure. The guide slope of the trapezoidal block forms a progressive guide fit with the locking hole. When the hammer is driven to the valve-opening position by the hydraulic cylinder, the movable column automatically slides into the locking hole along the guide slope under the force of the second spring, completing mechanical self-locking. When the flow rate sensing component detects a pipe burst signal, the hydraulic pressure pushes the annular diaphragm of the locking and releasing component to deform, causing the unlocking rod to precisely extend into the locking hole, overcoming the resistance of the second spring and pushing the movable column back, causing the hammer to immediately release from constraint and fall rapidly under gravity, driving the crank arm to rotate and close the butterfly valve. This purely mechanical locking and unlocking mechanism is responsive and reliable, requires no electricity, and is unaffected by electromagnetic interference, temperature changes, or component aging, ensuring the determinism, repeatability, and long-term operational reliability of emergency shutdown actions. Attached Figure Description

[0019] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 A schematic diagram of an emergency shut-off valve for pipe burst protection in long-distance water supply pipelines; Figure 2 A schematic diagram of the flow meter pipe section, flange connection, and flange seat structure; Figure 3 This is a structural schematic diagram of the shaft, balancing mechanism, and reversing valve. Figure 4 This is a structural diagram of the shaft, the stroke-limiting cam, and the connecting rod. Figure 5 A cross-sectional view of the balancing mechanism; Figure 6 This is a cross-sectional view of the directional control valve; Figure 7 A schematic diagram of the crank arm, hydraulic cylinder, and counterweight; Figure 8 A structural schematic diagram of the hydraulic pump station, base, and crank arm; Figure 9 This is a structural diagram of the locking component; Figure 10 To lock the section view of the component; Figure 11 This is a structural schematic diagram of the locking and releasing assembly and the support; Figure 12 This is a schematic diagram of the initial internal structure of the locking and releasing component; Figure 13 This is a schematic diagram of the internal structure of the locking and releasing assembly under pressure. Figure 14 This is a structural diagram of the support and trapezoidal block; Figure 15 This is a schematic diagram of the reversing valve and the stroke limit cam; Figure 16 This is a schematic diagram of the stroke-limiting cam. Reference numerals: 1. Flow meter pipe section; 2. Butterfly valve; 3. Crank arm; 4. Support; 5. Counterweight; 6. Flow velocity sensing component; 7. Drive device; 8. Locking and release component; 9. Balancing mechanism; 10. Directional valve; 11. Flange connection; 12. Locking component; 13. Hydraulic cylinder; 31. Horizontal arm; 32. Slanted arm; 33. Mounting hole; 34. Rotating shaft; 41. Mounting plate; 61. Pipeline; 62. Flange seat; 63. Stroke limit cam; 64. Connecting rod; 81. Housing; 82. Unlocking rod; 83. Mounting block; 84. Annular diaphragm; 85. Pressure inlet; 86. Drain outlet; 87. Cover plate; 88. Annular protrusion; 91. Housing; 92. Top cover; 93. Spring seat; 94. First spring; 95. Spring clamping cover; 96. Adjusting screw 97. Rod; 98. Nut; 101. Limiting pin; 102. Valve body; 103. Valve core cavity; 104. Valve core; 105. Third spring; 106. Adjusting shim; 106. Adjusting rod; 1061. Adjusting cavity; 107. End cap; 108. Locking nut; 111. Inlet; 113. Outlet; 121. Portal block; 122. Cylinder; 123. Receiving cavity; 124. Mounting through hole; 125. Mounting pin; 1251. Adjusting nut; 126. Second spring; 127. Movable pin; 131. Hydraulic pump station; 133. High-pressure hose; 311. Counterweight; 312. Bolt; 411. Trapezoidal block; 412. Locking hole; 413. Guide slope; 621. Shaft; 622. Connecting ring; 623. Connecting pin; 624. Water-receiving plate; 631. Trigger protrusion; 632. Cam base; 633. Mounting hole; 634. Keyway. Detailed Implementation

[0021] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0023] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0024] The present invention will be further explained below with reference to specific embodiments.

[0025] like Figures 1-16 As shown in the figure, this embodiment provides an emergency shut-off valve for pipe burst protection in long water supply pipelines, including: a flow meter pipe section 1, the outlet end of the flow meter pipe section 1 is sealed and fixed to the inlet end of the butterfly valve 2 by a flange connection, and the inlet end is connected to the flange of the upstream pipeline. A crank arm 3 is fixedly connected to the valve stem of the butterfly valve 2, and rotates within a support 4. The support 4 is fixedly installed on the mounting base or pipe bracket. One end of the crank arm 3 is equipped with a counterweight 5, and the other end is hinged to the output end of the drive device 7. The drive device 7 drives the crank arm 3 to rotate, causing the counterweight 5 to move to the locking position of the locking release assembly 8. The locking release assembly 8 is mounted on the support 4 and is used to lock or release the counterweight 5. A flow velocity sensing assembly 6 is mounted on the flow meter pipe section 1 and connected to the locking release assembly 8 via a pipe 61. It is used to monitor the fluid flow velocity in the pipe in real time. When the detected flow velocity exceeds a preset threshold, the hydraulic pressure in the pipe 61 triggers the locking release assembly 8 to unlock, causing the counterweight 5 to rotate under gravity, thereby quickly closing the butterfly valve 2 and cutting off the fluid channel to prevent the disaster from escalating. The entire process does not rely on external power and is entirely driven by gravity, ensuring high reliability in emergency situations. The drive unit 7 is used to drive the hammer 5 to rotate to a predetermined position, and the lock release component 8 unlocks the hammer 5.

[0026] like Figures 2-6 , Figure 15 , Figure 16 As shown, in this embodiment, the flow velocity sensing component 6 also includes a flange seat 62. The flange seat 62 is a blind flange structure with a closed top. Its bottom flange face is fastened with bolts and cooperates with a sealing gasket to achieve a sealed connection with the top flange of the flange connector 11. The flange connector 11 is vertically welded or integrally formed on the top of the flow meter pipe section 1 and communicates with the inner cavity of the pipe section. A shaft 621 is transversely arranged through the side wall of the flange seat 62. The shaft 621 serves as the core drive shaft of the flow velocity sensing component 6 and has the function of converting the hydrodynamic force of the water-facing plate 624 into angular displacement. The shaft 621 and the two side walls of the flange seat 62 achieve a rotational sealing cooperation through sealed bearings. The two ends of the shaft 621 extend out of the outside of the flange seat 62 and are respectively fitted with a stroke limit cam 63 and a connecting rod 64, forming a double-end output structure with internal and external linkage. The stroke limiting cam 63 includes an annular cam base 632. The center of the cam base 632 has an axially penetrating mounting hole 633. The wall of the mounting hole 633 is recessed inward to form an axially penetrating keyway 634. The stroke limiting cam 63 is mounted on the end of the shaft 621 through the mounting hole 633 and the keyway 634. A trigger protrusion 631 is provided on the outer peripheral surface of the cam base 632. The trigger protrusion 631 extends outward along the radial direction of the cam base 632. The contour of the trigger protrusion 631 is a smooth non-circular curved surface. The trigger protrusion 631 is only provided on one side of the circumference of the cam base 632. The stroke limiting cam 63 rotates synchronously with the shaft 621. When it rotates to a preset trigger angle, the trigger protrusion 631 pushes the valve core 103 of the reversing valve 10, driving the valve core 103 to move upward, thereby opening the reversing valve 10. The other end of the connecting rod 64 is used to interact with the balancing mechanism 9. This double-end arrangement allows for the synchronous and coordinated realization of flow velocity signal detection, balance adjustment, and hydraulic conversion functions. The shaft 621 is located in the middle of the inner cavity of the flange seat 62 and is fixedly fitted with a connecting ring 622. The connecting ring 622 extends downward to provide a connecting post 623. The lower part of the connecting post 623 is fixedly connected to a water-facing plate 624. The water-facing plate 624 is a flat or slightly arc-shaped plate structure. Its plate surface is arranged perpendicular to the fluid flow direction and is suspended in the inner cavity of the water-facing side of the flowmeter pipe section 1, facing the incoming flow direction, ensuring the accuracy of flow velocity detection and the sensitivity of response.

[0027] Furthermore, a balancing mechanism 9 and a reversing valve 10 are fixedly installed on both sides of the top of the flange seat 62, respectively. The balancing mechanism 9 includes a housing 91, a top cover 92 on the top of the housing 91, and a spring seat 93 at the bottom of the cavity of the housing 91. A first spring 94 is fixed on the spring seat 93 and is vertically installed on the spring seat 93. The top of the first spring 94 abuts against a spring compression cover 95. An adjusting screw 96 is provided in the middle of the top surface of the spring compression cover 95. The adjusting screw 96 extends upward out of the top cover 92 and is screwed with a nut 97. By rotating the nut 97 to change the axial position of the adjusting screw 96, the compression degree of the spring compression cover 95 on the first spring 94 can be adjusted, thereby continuously changing the output spring force of the first spring 94. This design can flexibly set the trigger threshold according to the operating pressure, normal flow rate range, and safety protection requirements of different pipelines, realizing quantitative adjustment of working condition adaptability. A limiting post 98 is provided at the center of the bottom surface of the spring seat 93. The limiting post 98 extends downward out of the housing 91 and contacts the upper end face of the connecting rod 64 to limit the rotation angle of the connecting rod 64. The contact relationship between the lower end face of the limiting post 98 and the upper end face of the connecting rod 64 forms a mechanical limit. The elastic force of the first spring 94 is transmitted to the connecting rod 64 through the limiting post 98, providing an adjustable resistance torque for the connecting rod 64 and the shaft 621 and the water-receiving plate 624 fixed thereto. Under normal operating conditions, the hydrodynamic torque on the water-receiving plate 624 is less than or equal to the resistance torque set by the balancing mechanism 9. The connecting rod 64 is limited to a small rotation angle range, the shaft 621 and the stroke limit cam 63 remain in their initial positions, and the reversing valve 10 does not operate. When a pipe burst causes an abnormal increase in flow velocity, and the hydrodynamic torque on the water-receiving plate 624 exceeds the set resistance torque, the connecting rod 64 overcomes the resistance of the first spring 94 and rotates at a large angle. The stroke limit cam 63 rotates accordingly and triggers the reversing valve 10 to operate. By adjusting the fit between the screw 96 and the nut 97, this triggering critical point can be precisely set, effectively filtering normal load fluctuations and interference signals, and avoiding malfunctions.

[0028] Furthermore, the reversing valve 10 includes a valve body 101, with an end cap 107 fixedly installed at the top of the valve body 101; the valve body 101 has a through-type valve core cavity 102 in the axial direction, and a valve core 103 is provided in the valve core cavity 102 for coaxial sliding cooperation. The valve core 103 has a stepped shaft structure and a sealing cone surface or sealing cylindrical surface in the middle, which can slide up and down along the axial direction to realize flow path switching. A third spring 104 is coaxially fitted onto the outer circumference of the upper part of the valve core 103. The third spring 104 provides an axial downward reset thrust for the valve core 103. An adjusting pad 105, an annular structure, is installed at the top of the third spring 104, with its top surface abutting against the bottom surface of the adjusting rod 106. The top of the valve core 103 is embedded in the adjusting cavity 1061 at the bottom of the adjusting rod 106 and can slide axially within the adjusting cavity 1061. The adjusting rod 106 extends upward through the end cover 107 and is locked in place by a locking nut 108. A threaded sealing structure is used between the adjusting rod 106 and the end cover 107 to prevent pressurized water leakage. The position of the adjusting rod 106 is adjusted by tightening or loosening the locking nut 108. After the action threshold is determined, it is locked in place to ensure stable parameters during operation. The locking nut 108 is a cap nut, and the top of the adjusting rod 106 does not reach the top of the inner cavity of the locking nut 108, leaving an adjustment margin. The lower side wall of the valve body 101 is radially symmetrically provided with an inlet 111 and an outlet 113. Both the inlet 111 and the outlet 113 are connected to the valve core cavity 102. When the valve core 103 slides axially, it switches the on / off state of the inlet 111 and the outlet 113 to realize the flow path opening and closing. When the valve core 103 slides axially, its outer circumferential surface can block or open the communication channel between the inlet 111 and the outlet 113: when the valve core 103 is in the lower position, the sealing section of the valve core 103 isolates the inlet 111 and the outlet 113, and the flow path is closed; when the valve core 103 is pushed to the upper position, the inlet 111 and the outlet 113 are connected through the valve core cavity 102, and the flow path is opened. The inlet 111 is connected to the inlet end of the flow meter pipe section 1 via pipe 61, introducing the pressurized water of the pipe itself as the working medium; the outlet 113 is connected to the locking and releasing assembly 8 via pipe 61, forming a complete hydraulic control circuit. This circuit directly utilizes the pipeline pressure, simplifying the system structure and reducing costs and maintenance workload. The valve core 103 extends downward through the valve body 101 and abuts against the outer periphery of the stroke limit cam 63. When the stroke limit cam 63 rotates, it pushes the valve core 103 upward along the axial direction through its contour. The contact point is located on the contour curve of the stroke limit cam 63. When the stroke limit cam 63 rotates, it pushes the valve core 103 upward along the axial direction through the change in the lift of its contour.

[0029] like Figures 12-14As shown, in this embodiment, a vertical mounting plate 41 is provided on the support 4. A locking release assembly 8 is provided on the side of the mounting plate 41 near the butterfly valve 2. This arrangement allows the unlocking rod 82 to directly act on the locking position of the crank arm 3, resulting in a short transmission chain and direct action. The locking release assembly 8 includes a housing 81. A cover plate 87 is provided at the front end of the housing 81, which is fixedly installed on the mounting plate 41 by bolts, facilitating disassembly and maintenance. A pressure inlet 85 and a drain outlet 86 are provided at the rear end of the housing 81. The pressure inlet 85 is connected to the outlet 113 through a pipe 61 to receive the water pressure from the flow meter pipe section 1 after the reversing valve 10 is opened. The drain outlet 86 is used to release the pressurized water in the rear cavity of the housing 81 to achieve reset. An annular protrusion 88 is provided in the middle of the inner cavity of the outer shell 81. The outer edge of an annular diaphragm 84 is fixedly connected to the inner wall of the annular protrusion 88. The inner edge of the annular diaphragm 84 is connected to a circular mounting block 83, forming a flexible partition structure that divides the inner cavity of the outer shell 81 into a front cavity and a rear cavity. An unlocking rod 82 is fixedly provided axially at the center of the mounting block 83. The unlocking rod 82 extends horizontally forward and slides through the cover plate 87. The annular diaphragm 84 divides the inner cavity of the outer shell 81 into a front cavity and a rear cavity. The pressure inlet 85 and the drain 86 are both connected to the rear cavity. When pressurized water from the pipeline enters the rear cavity through the pressure inlet 85, the annular diaphragm 84 is deformed by pressure, causing the mounting block 83 and the unlocking rod 82 to move forward. When pressurized water enters the rear chamber through the pressure inlet 85, the annular diaphragm 84 undergoes elastic deformation under pressure, causing the mounting block 83 and unlocking rod 82 to move forward. This pushes the movable column 127 of the locking assembly 12 back, thus unlocking the device. When the pressurized water is released through the drain outlet 86, the annular diaphragm 84 resets under its own elasticity, causing the unlocking rod 82 to retract, preparing for the next locking operation. The use of the annular diaphragm 84 allows hydraulic pressure to be sensitively converted into axial displacement and provides excellent sealing, preventing pressurized water leakage into the front chamber. Simultaneously, the elastic characteristics of the annular diaphragm 84 absorb pressure fluctuations, preventing false triggering.

[0030] like Figures 7-8As shown, in this embodiment, the crank arm 3 includes a horizontal arm 31 and an inclined arm 32 connected to the horizontal arm 31 and tilting upwards. The horizontal arm 31 and the inclined arm 32 are integrally formed structures with a rounded transition at the connection point; this effectively reduces stress concentration and improves the fatigue strength of the component. A mounting hole 33 is provided at the connection point of the horizontal arm 31 and the inclined arm 32. The mounting hole 33 fits and fixes the rotating shaft 34. The valve shaft of the butterfly valve 2 is coaxially and fixedly connected to the rotating shaft 34, forming a reliable torque transmission path. The two ends of the rotating shaft 34 are rotatably connected to the support 4; a counterweight 5 is installed at the front end of the horizontal arm 31, which consists of two sets of counterweight blocks 311 symmetrically arranged at the front end of the horizontal arm 31, each set containing at least one counterweight block 311. The counterweight blocks 311 are attached to the side surface of the horizontal arm 31 and fastened by transversely penetrating bolts 312; this detachable counterweight structure allows for adjustment of the mass of the counterweight 5 according to pipeline specifications, working pressure, and shut-off time requirements, realizing quantitative adjustment of the closing torque, so that the valve can quickly close and cut off the water source, while avoiding water hammer hazards caused by excessively rapid closure. The free end of the inclined arm 32 is connected to the drive device 7, which includes a hydraulic cylinder 13. The piston rod of hydraulic cylinder 13 is hinged to the free end of inclined arm 32, and the cylinder body of hydraulic cylinder 13 is fixed on support 4. Hydraulic cylinder 13 is connected to hydraulic pump station 131, which is located on the side wall of support 4, opposite to the counterweight 5. Hydraulic pump station 131 is connected to hydraulic cylinder 13 via high-pressure hose 133. Both hydraulic pump station 131 and hydraulic cylinder 13 are existing equipment. Hydraulic pump station 131 drives hydraulic cylinder 13 by electric motor drive, manual drive, etc. When butterfly valve 2 needs to be opened, hydraulic pump station 131 starts, high-pressure oil enters the rodless chamber of hydraulic cylinder 13, pushing the piston rod to extend. Through inclined arm 32, crank arm 3 is driven to rotate, raising the counterweight 5 to the valve opening position. After it is in position, locking and releasing component 8 locks the counterweight 5, and hydraulic pump station 131 can stop oil supply or switch to low-pressure holding state. Drive device 7 no longer continuously bears the load of counterweight 5, reducing energy consumption and system internal leakage loss, and overcoming the defects of traditional accumulator pressure holding method that requires frequent pressure replenishment and cumbersome maintenance.

[0031] like Figures 7-8As shown, in this embodiment, a locking assembly 12 is provided in the middle of the top surface of the horizontal arm 31. The locking assembly 12 includes a gate-shaped block 121, and a cylinder 122 is fixedly fixed through the upper part of the gate-shaped block 121. The cylinder 122 has a receiving cavity 123 opening towards the butterfly valve 2, and a mounting through hole 124 provided on the side away from the butterfly valve 2. The mounting through hole 124 communicates with the receiving cavity 123 and its diameter is smaller than the diameter of the receiving cavity 123, forming a stepped hole structure. A mounting post 125 is inserted into the mounting through hole 124. An adjusting nut 1251 is threaded to the outer end of the mounting post 125. The inner end of the mounting post 125 extends into the receiving cavity 123 and is fixedly connected to one end of a movable post 127. The movable post 127 can slide axially within the receiving cavity 123. A second spring 126 is fitted onto the column 125 located within the receiving cavity 123. One end of the second spring 126 is fixedly connected to the bottom surface of the receiving cavity 123, and the other end elastically abuts against the inner end face of the movable column 127, providing an outward elastic thrust to the movable column 127. Under the elastic force of the second spring 126, the movable column 127 can slide axially along the receiving cavity 123, and its outer end extends out of the opening end of the receiving cavity 123, forming an elastic telescopic locking tongue structure.

[0032] like Figures 9-10 As shown, in this embodiment, a trapezoidal block 411 is provided on the side of the mounting plate 41 facing the crank arm 3; a locking hole 412 is provided on the trapezoidal block 411 that penetrates the mounting plate 41, and a guide slope 413 is provided on one side of the trapezoidal block 411; the protruding end of the movable column 127 cooperates with the guide slope 413 and the locking hole 412. When the movable column 127 slides along the guide slope 413 to the locking hole 412, a locking state is achieved. When the flow meter pipe section 1 bursts, the unlocking rod 82 extends into the locking hole 412 and pushes the movable column 127 in the locking hole 412, causing the movable column 127 to disengage from the locking hole 412. The counterweight 5 drives the crank arm 3 to rotate under the action of gravity, thereby achieving the rapid closing of the butterfly valve 2. When the crank arm 3 is driven by the drive device 7 to rotate to the valve-opening position, the end of the movable column 127 first contacts the guide slope 413 of the trapezoidal block 411. As it continues to rotate, the movable column 127 is subjected to radial compression by the guide slope 413, overcoming the resistance of the second spring 126 and retracting into the receiving cavity 123. When the movable column 127 is aligned with the locking hole 412, the elastic force of the second spring 126 pushes the movable column 127 to extend and embed into the locking hole 412, achieving mechanical self-locking. At this time, even if the hydraulic system is completely depressurized, the gravity of the counterweight 5 cannot dislodge the movable column 127, and the locked state is stable and reliable.

[0033] This embodiment also provides an emergency shut-off valve for pipe burst protection in long-distance water supply pipelines, with the following operating procedure: Under normal water supply conditions, the hydraulic pump station 131 drives the piston rod of the hydraulic cylinder 13 to extend, which drives the horizontal arm 31 and the counterweight 5 to rotate and lift to the valve opening position via the crank arm 3 and the inclined arm 32. At this time, the movable column 127 of the locking component 12 automatically slides into the locking hole 412 along the guide inclined surface 413 of the trapezoidal block 411 under the action of the second spring 126 to complete the mechanical self-locking. The butterfly valve 2 remains fully open, and the fluid flows normally through the flow meter section 1. The water-facing plate 624 of the flow velocity sensing component 6 maintains a stable deflection angle under the resistance torque limit set by the balancing mechanism 9, and the reversing valve 10 is in the closed state. When a pipe burst accident occurs downstream of the pipeline, the fluid velocity surges abnormally, and the fluid dynamic torque on the water-facing plate 624 exceeds the threshold set by the balancing mechanism 9, causing the valve to... The shaft 621 and the stroke limit cam 63 rotate rapidly. The contour of the stroke limit cam 63 pushes the valve core 103 of the reversing valve 10 to move upward against the resistance of the third spring 104, and the reversing valve 10 opens. The pipeline pressure water is transmitted through the pipeline 61 to the pressure inlet 85 of the locking release assembly 8. The annular diaphragm 84 is deformed by pressure, which drives the unlocking rod 82 to extend into the locking hole 412 and push the movable column 127 to retract. The counterweight 5 is immediately released from restraint and falls rapidly under the action of gravity. Through the crank arm 3, the valve shaft of the butterfly valve 2 is rotated to realize the valve is quickly closed, cut off the upstream water source, and complete the pipe burst protection action. After the accident is eliminated, the pressure in the rear chamber of the locking release assembly 8 is released through the drain port 86. The annular diaphragm 84 is reset and drives the unlocking rod 82 to retract. The hydraulic pump station 131 is restarted to drive the counterweight 5 to rise. The movable column 127 is re-embedded in the locking hole 412 to restore the standby state.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An emergency shut-off valve for rupture protection in long-distance water supply pipelines, characterized in that, include: A butterfly valve (2) is connected to the outlet end of the flow meter pipe section (1); The crank arm (3) is fixedly connected to the valve stem of the butterfly valve (2), and the crank arm (3) rotates in the support (4); one end of the crank arm (3) is provided with a counterweight (5), and the other end is hinged to the output end of the drive device (7); the drive device (7) is used to drive the crank arm (3) to rotate, so that the counterweight (5) moves to the locking position of the locking release assembly (8); The locking and releasing assembly (8) is provided on the support (4) and is used to lock or release the counterweight (5). The flow velocity sensing component (6) is installed on the flow meter pipe section (1) and connected to the locking release component (8) through the pipe (61). It is used to monitor the fluid flow velocity in the pipe in real time. When the flow velocity exceeds the preset threshold, the locking release component (8) is triggered to unlock by the hydraulic pressure in the pipe (61), so that the weight (5) drives the crank arm (3) to rotate under the action of gravity, thereby realizing the rapid closing of the butterfly valve (2).

2. The emergency shut-off valve for pipe burst protection in long water supply pipelines according to claim 1, characterized in that, The flow rate sensing component (6) also includes a flange seat (62), which is a blind flange structure with a closed top. Its bottom flange face is sealed to the top flange of the flange connector (11). The flange connector (11) is vertically arranged at the top of the flow meter pipe section (1) and communicates with the inner cavity of the pipe section.

3. The emergency shut-off valve for pipe burst protection in long water supply pipelines according to claim 2, characterized in that, A shaft (621) is transversely installed through the side wall of the flange seat (62). The shaft (621) is rotatably sealed with the two side walls of the flange seat (62). The two ends of the shaft (621) extend out of the outside of the flange seat (62) and are respectively fitted with a stroke limit cam (63) and a connecting rod (64). The shaft (621) is located in the middle of the inner cavity of the flange seat (62) and is fixedly fitted with a connecting ring (622). The connecting ring (622) extends downward and is provided with a connecting column (623). The lower part of the connecting column (623) is fixedly connected with a water-facing plate (624). The water-facing plate (624) is suspended in the inner cavity of the water-facing side of the flow meter pipe section (1).

4. The emergency shut-off valve for pipe burst protection in long water supply pipelines according to claim 3, characterized in that, A balancing mechanism (9) and a reversing valve (10) are fixedly installed on both sides of the top of the flange seat (62). The balancing mechanism (9) includes a housing (91), a top cover (92) is provided on the top of the housing (91), a spring seat (93) is provided at the bottom of the cavity of the housing (91), a first spring (94) is fixed on the spring seat (93), the top of the first spring (94) abuts against a spring compression cover (95), an adjusting screw (96) is provided in the middle of the top surface of the spring compression cover (95), the adjusting screw (96) extends upward out of the top cover (92) and is screwed with a nut (97); a limiting post (98) is provided at the center of the bottom surface of the spring seat (93), the limiting post (98) extends downward out of the housing (91) and contacts the upper end face of the connecting rod (64) to limit the rotation angle of the connecting rod (64).

5. An emergency shut-off valve for pipe burst protection in long water supply pipelines according to claim 4, characterized in that, The reversing valve (10) includes a valve body (101), and an end cap (107) is fixedly installed on the top of the valve body (101). The valve body (101) has an axially through-type valve core cavity (102), and a valve core (103) is provided in the valve core cavity (102) with a coaxial sliding fit. A third spring (104) is coaxially snapped onto the outer periphery of the upper part of the valve core (103). The third spring (104) provides an axial downward reset thrust for the valve core (103). An adjusting pad (105) is provided at the top of the third spring (104), and the top surface of the adjusting pad (105) abuts against the bottom surface of the adjusting rod (106). The top of the valve core (103) is embedded in the adjusting cavity (1061) at the bottom of the adjusting rod (106) and can slide axially in the adjusting cavity (1061). The adjusting rod (106) extends upward through the end cover (107) and is locked in place by the locking nut (108) to position its axial position; the lower side wall of the valve body (101) is radially symmetrically provided with an inlet (111) and an outlet (113), both of which are connected to the valve core cavity (102). When the valve core (103) slides along the axial direction, it switches the on / off state of the inlet (111) and the outlet (113) to realize the flow path on / off; the valve core (103) extends downward through the valve body (101) and abuts against the contour of the trigger protrusion (631) on the outer periphery of the stroke limit cam (63). When the stroke limit cam (63) rotates, it pushes the valve core (103) to move upward along the axial direction through the trigger protrusion (631).

6. An emergency shut-off valve for pipe burst protection in long-distance water supply pipelines according to claim 5, characterized in that, The inlet (111) is connected to the inlet end of the flow meter pipe section (1) via pipe (61); the outlet (113) is connected to the locking release assembly (8) via pipe (61).

7. An emergency shut-off valve for pipe rupture protection in long water supply pipelines according to claim 1, characterized in that, A vertical mounting plate (41) is provided on the support (4). A locking and releasing assembly (8) is provided on the side of the mounting plate (41) near the butterfly valve (2). The locking and releasing assembly (8) includes a housing (81). A cover plate (87) is provided at the front end of the housing (81). The cover plate (87) is fixedly installed on the mounting plate (41). A pressure inlet (85) and a drain outlet (86) are provided at the rear end of the housing (81). The pressure inlet (85) is connected to the outlet (113) through a pipe (61). An annular protrusion (88) is provided in the middle of the inner cavity of the housing (81). The inner wall of the annular protrusion (88) is fixedly connected to the inner wall of the annular protrusion (88). The outer edge of the annular diaphragm (84) is connected to the inner edge of the annular diaphragm (84), and a circular mounting block (83) is connected to the inner edge of the annular diaphragm (84). An unlocking rod (82) is fixedly installed at the center of the mounting block (83) along the axial direction. The unlocking rod (82) extends horizontally forward and slides through the cover plate (87). The annular diaphragm (84) divides the inner cavity of the outer shell (81) into a front cavity and a rear cavity. The pressure inlet (85) and the drain (86) are both connected to the rear cavity. When the pressurized water in the pipeline enters the rear cavity through the pressure inlet (85), the annular diaphragm (84) is deformed by pressure, which drives the mounting block (83) and the unlocking rod (82) to move forward.

8. An emergency shut-off valve for pipe burst protection in long water supply pipelines according to claim 1, characterized in that, The crank arm (3) includes a horizontal arm (31) and an inclined arm (32) that is connected to the horizontal arm (31) and tilts upward. The horizontal arm (31) and the inclined arm (32) are integrally formed, with a rounded transition at the connection. A mounting hole (33) is provided at the connection between the horizontal arm (31) and the inclined arm (32). The mounting hole (33) fits and fixes the rotating shaft (34). The valve shaft of the butterfly valve (2) is coaxially and fixedly connected to the rotating shaft (34). The two ends of the rotating shaft (34) are rotatably connected to the support (4). A counterweight (5) is provided at the front end of the horizontal arm (31). The counterweight (5) consists of two sets of counterweight blocks (311) symmetrically arranged at the front end of the horizontal arm (31). Each set contains at least one counterweight block (311). 1) The counterweight (311) is attached to the side surface of the horizontal arm (31) and fastened by a transverse through bolt (312); the free end of the inclined arm (32) is connected to the drive device (7), the drive device (7) includes a hydraulic cylinder (13), the end of the piston rod of the hydraulic cylinder (13) is hinged to the free end of the inclined arm (32), and the cylinder body of the hydraulic cylinder (13) is fixed on the support (4); the hydraulic cylinder (13) is connected to the hydraulic pump station (131), the hydraulic pump station (131) is set on the side wall of the support (4) and located on the side opposite to the hammer (5), and the hydraulic pump station (131) is connected to the hydraulic cylinder (13) through a high-pressure hose (133).

9. An emergency shut-off valve for pipe burst protection in long water supply pipelines according to claim 8, characterized in that, A locking assembly (12) is provided in the middle of the top surface of the horizontal arm (31). The locking assembly (12) includes a gate block (121). A cylinder (122) is fixed through the upper part of the gate block (121). The cylinder (122) has a receiving cavity (123) opening towards the butterfly valve (2) and a mounting through hole (124) provided on the side away from the butterfly valve (2). The mounting through hole (124) communicates with the receiving cavity (123) and its diameter is smaller than the diameter of the receiving cavity (123). A mounting post (125) is provided inside the mounting through hole (124). The outer end of the mounting post (125) is threaded. There is an adjusting nut (1251), the inner end of the mounting column (125) extends into the receiving cavity (123) and is fixedly connected to one end of the movable column (127); the mounting column (125) is fitted with a second spring (126) on the column body inside the receiving cavity (123), one end of the second spring (126) is fixedly connected to the bottom surface of the receiving cavity (123), and the other end elastically abuts against the inner end face of the movable column (127); the movable column (127) can slide along the axial direction of the receiving cavity (123) under the elastic force of the second spring (126), and its outer end extends out of the opening end of the receiving cavity (123).

10. An emergency shut-off valve for pipe burst protection in long water supply pipelines according to claim 9, characterized in that, A trapezoidal block (411) is provided on the side of the mounting plate (41) facing the crank arm (3); a locking hole (412) is provided on the trapezoidal block (411) through the mounting plate (41), and a guide slope (413) is provided on one side of the trapezoidal block (411); the extended end of the movable column (127) cooperates with the guide slope (413) and the locking hole (412). When the movable column (127) slides along the guide slope (413) to the locking hole (412), the locking state is achieved. When the flow meter pipe section (1) bursts, the unlocking rod (82) extends into the locking hole (412) and pushes the movable column (127) in the locking hole (412), so that the movable column (127) is disengaged from the locking hole (412). The counterweight (5) drives the crank arm (3) to rotate under the action of gravity, so as to achieve the rapid closing of the butterfly valve (2).

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