Mechanical differential pressure time integral triggered self-locking leak-proof valve

Abstract

The application discloses a mechanical pressure-difference time-integral trigger self-locking leak-proof valve, which comprises a valve body, a main valve core assembly, a pressure-difference time-integral assembly, an excitation transmission mechanism, a closing energy storage piece and a manual reset mechanism. A main flow passage in the valve body is provided with a first pressure-taking position and a second pressure-taking position at intervals along a fluid flow direction, and a pressure-difference generating section is arranged between the two positions. The pressure-difference time-integral assembly comprises a piston cavity, a pressure-difference movable piece, a damping channel and a piston reset piece, and the pressure-difference movable piece divides the piston cavity into a first pressure cavity and a second pressure cavity which are respectively communicated with the first pressure-taking position and the second pressure-taking position. When normal short-time flow occurs, the pressure-difference movable piece does not reach a preset trigger stroke; when abnormal continuous flow occurs, the pressure-difference movable piece is moved under the action of continuous pressure difference through damping delay and triggers the excitation transmission mechanism, releases the closing energy storage piece, and makes the main valve core assembly close the main flow passage. The application does not depend on external power supply or electronic sensors, and is suitable for automatic cut-off of abnormal continuous leakage of pipelines.

Description

Technical Field

[0001] This invention relates to the field of fluid control valve technology, and in particular to a mechanical differential pressure time integral triggering self-locking leak-proof valve. Background Technology

[0002] In public buildings, industrial production, agricultural irrigation, and laboratory water supply systems, fluid pipelines typically need to maintain a continuous flow capability so that users or equipment can access the fluid at any time. However, in actual use, continuous leaks caused by factors such as unclosed faucets, detached hoses, loose pipe joints, ruptured downstream branch pipes, damaged water terminals, or improperly closed valves are quite common. Continuous leaks not only waste water resources or other fluid media, but also, in unattended or poorly managed scenarios, can lead to subsequent problems such as flooding, equipment soaking, electrical short circuits, production interruptions, and partial damage to buildings. Therefore, it is of practical significance to install leak-proof devices in branch pipelines that can identify abnormal continuous flow and automatically shut off the fluid.

[0003] Various self-closing valves or leakage protection devices already exist in existing technologies. For example, the time-delay self-closing faucets commonly found in public restrooms typically open briefly by pressing a button and then automatically close after a certain time using a spring, damping chamber, diaphragm, or throttling structure. This type of structure primarily addresses the problem of excessively long single-use water usage time; the start of its delay action is usually related to the manual pressing or opening action. In other words, this type of structure is more of a time-limiting device than a device for judging abnormal downstream leakage conditions. When the delay time is set too short, it may affect normal handwashing, cleaning of utensils, or other normal water usage needs; when the delay time is set too long, it is difficult to promptly cut off continuous leakage caused by pipe ruptures, hose detachments, or unclosed terminals.

[0004] Some mechanical automatic shut-off valves rely on springs, rubber diaphragms, sealing rings, floats, or differential pressure structures to open and close. Spring-return valves can close using elastic force after external force is released, float valves can control the opening and closing of water supply lines based on liquid level changes, and some differential pressure valves can close when fluid pressure changes or flow rates are abnormal. However, these structures are usually designed for specific opening and closing trigger conditions and may not be able to effectively distinguish between normal short-term flow and abnormal continuous flow. In scenarios such as public restrooms, laboratories, and irrigation branches, normal flow may be characterized by short periods, intermittent use, and continuous use by multiple people. If the valve closes only based on instantaneous pressure difference or instantaneous flow, it is prone to malfunction. If the valve cannot promptly return to its initial judgment state after the short-term flow ends, residual displacement between multiple short-term flows may accumulate, leading to erroneous closure under normal conditions.

[0005] Electronic leak detectors use components such as flow sensors, water immersion sensors, pressure sensors, solenoid valves, and controllers to detect abnormal conditions and shut off the solenoid valve when a leak is detected. While these devices have some application in residential and industrial settings, they typically require batteries or external power, and necessitate the configuration of sensors, control circuits, and electronic actuators, resulting in higher overall costs and more demanding installation and maintenance requirements. In humid, high-temperature, dusty, outdoor, high-vibration, or inconvenient maintenance environments, the reliability of electronic components and electrical connections is easily affected. Furthermore, for scenarios requiring only low-cost, purely mechanical, and long-term reliable leak prevention on branch lines, the complexity and maintenance requirements of electronic solutions may not be suitable.

[0006] Based on the above, it is necessary to provide a leak-proof valve capable of mechanically judging based on the fluid's own flow state. This leak-proof valve should remain open under normal, short-term flow conditions, automatically close after abnormal, continuous flow exceeds a preset time, and remain closed after closing to prevent automatic reopening before the fault is resolved. Simultaneously, the leak-proof valve should minimize its dependence on power supplies, electronic controllers, and electronic sensors to improve its applicability and long-term stability in complex environments. Summary of the Invention

[0007] This invention aims to provide a mechanically triggered self-locking leak-proof valve based on differential pressure time integration. The valve acquires flow differential pressure signals through a first and a second pressure tap position spaced at intervals along the fluid flow direction in the main flow channel, and uses these signals to drive a differential pressure piston. The movement of the differential pressure piston is limited by a damping channel, making its displacement related to the duration of fluid flow. When the flow duration is short, the differential pressure piston has not yet reached the preset trigger stroke, and the valve remains open. When the flow continues and exceeds the set time, the differential pressure piston moves to the preset trigger stroke, triggering a bistable locking mechanism to release and close the energy storage element. The closing energy storage element then drives the main valve core assembly to close the main flow channel. After the valve closes, the bistable locking mechanism remains in a stable state after release and requires manual reset.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: A mechanically triggered differential pressure time integration self-locking leak-proof valve includes a valve body, a main valve core assembly, a differential pressure time integration assembly, a shut-off energy storage element, an activation transmission mechanism, and a manual reset mechanism. The valve body has a main flow channel from the inlet to the outlet, and the main flow channel has first and second pressure tapping positions spaced apart along the fluid flow direction. When continuous flow exists within the main flow channel, a pressure difference is formed between the first and second pressure tapping positions, which serves as a mechanical judgment signal for the differential pressure time integration assembly.

[0009] The main valve core assembly is located within the main flow channel and has a normally open state for opening the main flow channel and a closed state for closing the main flow channel. When no abnormal closing action is triggered, the main valve core assembly keeps the main flow channel open, allowing this self-locking leak-proof valve to be installed in the pipeline as a normally open branch leak-proof valve.

[0010] The differential pressure time integrator is located within the valve body, downstream of the main valve core assembly. The differential pressure time integrator includes a piston chamber, a differential pressure piston, a damping channel, and a piston reset component. The differential pressure piston is movably disposed within the piston chamber, dividing the piston chamber into a first pressure chamber and a second pressure chamber. The first pressure chamber communicates with a first pressure tapping position, and the second pressure chamber communicates with a second pressure tapping position. The damping channel connects the first and second pressure chambers, and the piston reset component cooperates with the differential pressure piston.

[0011] When the main flow channel continues to flow, a pressure difference is formed between the first and second pressure chambers. Under the action of this pressure difference, the differential pressure piston moves in the triggering direction. Because the damping channel limits the pressure balance velocity between the first and second pressure chambers, the differential pressure piston does not reach the trigger position instantaneously, but rather forms a delayed displacement related to the duration of continuous flow. When the main flow channel stops flowing or the pressure difference decreases, the piston reset component causes the differential pressure piston to return to its initial position.

[0012] The closing energy storage component is located on the closing drive side of the main valve core assembly, and it cooperates with both the excitation transmission mechanism and the main valve core assembly. When the excitation transmission mechanism is in the holding state, the closing energy storage component is held in the energy storage state, and the main valve core assembly remains in the normally open state. When the excitation transmission mechanism is in the release state, the closing energy storage component is released and drives the main valve core assembly from the normally open state to the closed state, thereby cutting off the main flow channel.

[0013] The actuation drive mechanism is located on the valve body, connected to the closing energy storage component, and situated above the differential pressure time integration component. It can switch between a holding state and a release state based on the movement of the differential pressure piston of the differential pressure time integration component. The actuation drive mechanism cooperates with the differential pressure moving component and has both holding and release states. The closing energy storage component cooperates with the main valve core assembly. When the actuation drive mechanism is in the holding state, the closing energy storage component is restricted and maintains its energy storage state, while the main valve core assembly remains open. When abnormal continuous flow exists in the main flow channel, a continuous pressure difference is formed between the first and second pressure chambers. Under the action of this continuous pressure difference, the differential pressure moving component gradually moves due to the damping effect of the damping channel. When the differential pressure moving component reaches the preset trigger stroke, the actuation drive mechanism is triggered and switches to the release state, the closing energy storage component releases its stored energy, and drives the main valve core assembly to close the main flow channel.

[0014] The manual reset mechanism is at least partially located on the outside of the valve body and connected to the valve core assembly.

[0015] Preferably, the main valve core assembly includes a valve seat, a valve disc, a valve stem, and an opening / resetting element. The valve seat is fixedly disposed in the main flow channel, and the valve disc is connected to the valve stem and can move with the valve stem. The opening / resetting element applies a force to the valve stem or valve disc in the opening direction, so that the main valve core assembly remains in a normally open state when not closed by the closing energy storage element.

[0016] Preferably, the closing energy storage component is a closing spring, which is sleeved on the valve stem. In the holding state, the closing spring is restricted by the limiting plate and kept in a compressed state. In the released state, it pushes the valve stem to move, causing the valve disc to conform to the valve seat and cut off the main flow channel.

[0017] Preferably, the differential pressure moving part is a differential pressure piston, and a sealing element is provided on the outer periphery of the differential pressure piston, which slides and seals against the inner wall of the piston chamber. A trigger rod is provided on the differential pressure piston, and when the differential pressure piston moves to a preset trigger stroke, the trigger rod triggers the actuation transmission mechanism.

[0018] Preferably, a differential pressure generation section is provided between the first pressure tapping position and the second pressure tapping position, and an interval section is provided between the first pressure tapping position, the second pressure tapping position and the differential pressure generation section.

[0019] Preferably, the excitation transmission mechanism includes a fixed rotating shaft, a short connecting rod, a rotating shaft, a long connecting rod, an excitation connecting rod, an excitation rotating shaft, and a trigger rod bracket. The trigger rod bracket cooperates with the trigger rod on the differential pressure piston. When the differential pressure piston moves to the preset trigger stroke, the trigger rod pushes or pulls the trigger rod bracket, causing the excitation rotating shaft to displace, thereby driving the connecting rod assembly to move and releasing the restriction on the shut-off energy storage device.

[0020] Preferably, the self-locking leak-proof valve further includes a limiting plate, which cooperates with the closing energy storage component; when the excitation transmission mechanism is in the holding state, the limiting plate restricts the release of the closing energy storage component; when the excitation transmission mechanism is in the releasing state, the limiting plate releases the restriction on the closing energy storage component.

[0021] Preferably, the valve stem is provided with a wedge-shaped block, and the limiting plate is provided with a slot that mates with the wedge-shaped block.

[0022] Preferably, the self-locking leak-proof valve also includes a manual reset mechanism. The manual reset mechanism includes a reset handle and a reset spring, with the reset handle connected to the valve stem. After the valve is closed, the user operates the reset handle after troubleshooting the downstream fault, causing the closing energy storage element to recharge and be locked by the limit plate, while simultaneously causing the valve disc to move away from the valve seat, and the main flow channel to reopen.

[0023] Preferably, the differential pressure time integration component further includes a bypass channel and a one-way valve core. The bypass channel is connected in parallel at both ends of the damping channel, and the one-way valve core is disposed within the bypass channel. The conduction direction of the one-way valve core corresponds to the fluid balance direction between the first and second pressure chambers when the differential pressure moving component resets. Therefore, after a normal short-term flow interruption, the differential pressure moving component can quickly reset, reducing the risk of false triggering caused by multiple consecutive short-term flow interruptions.

[0024] Preferably, the differential pressure time integration component further includes a ratchet, a reset component, a cam, a transmission link, and a trigger block that are linked to the differential pressure moving component. When the differential pressure moving component moves along the triggering direction, it drives the ratchet to rotate. When the reset component drives the ratchet to reset, it drives the cam to rotate. The cam drives the trigger block to leave the one-way valve core's switching triggering mechanism through the transmission link, so that the one-way valve core opens the bypass channel.

[0025] Preferably, an adjustable flow element is provided at the damping channel. The adjustable flow element includes a needle valve, an adjustment knob, a scale section, and an adjustment locking element. By adjusting the flow cross-sectional area of ​​the damping channel or the adjustment channel, the time required for the differential pressure moving part to reach the preset trigger stroke under continuous differential pressure can be changed, thereby adapting to the normal flow time and leakage prevention requirements of different usage scenarios. Beneficial effects

[0026] First, the present invention uses the pressure difference generated by the continuous flow through the pressure difference generation section in the pipeline as a judgment signal, without the need for external power supply, battery, electronic sensor or electronic control actuator, and the structure is more suitable for long-term decentralized installation and use.

[0027] Secondly, this invention limits the pressure balancing speed between the first and second pressure chambers through a damping channel, making the displacement of the differential pressure moving part related to the continuous flow time, thereby forming a mechanical "time integral" judgment. Normal short-term flow will not trigger shutdown, while abnormal continuous flow can trigger automatic shutdown after reaching a preset time.

[0028] Third, this invention forms a mechanical self-locking closing structure by activating the transmission mechanism, the limiting plate, and the closing energy storage component. Once the valve closes due to abnormal continuous flow, even if the downstream leakage point remains open, the main flow channel can remain closed, preventing continuous leakage.

[0029] Fourth, the present invention is equipped with a manual reset mechanism, which allows users to manually reset the device after troubleshooting, so that the closed energy storage device can re-store energy and return to the normally open state, which facilitates maintenance and reuse.

[0030] Fifth, in the preferred embodiment, the present invention enables the differential pressure moving parts to be quickly reset after normal flow ends by setting a bypass channel and a one-way valve core, thereby reducing the risk of false triggering caused by the accumulation of residual displacement from multiple short-term flow uses.

[0031] Sixth, in the preferred embodiment, the present invention, by setting an adjustable flow element and a replaceable throttling core, can adjust the trigger time and trigger flow range according to different scenarios such as public restrooms, agricultural irrigation, industrial cooling water, and laboratory water supply, and has strong applicability.

[0032] Seventh, this invention does not require an external power source, battery, electronic sensor, or electronic actuator, which can reduce reliability issues caused by electrical faults, aging lines, battery failure, or humid environments. It is suitable for public places, industrial sites, outdoor irrigation branches, and other long-term pipeline systems. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the excitation transmission mechanism of the present invention; Figure 3 This is a schematic diagram of the structure of the one-way valve core in the bypass channel of the present invention to achieve the switching of the open and closed states.

[0034] Explanation of reference numerals in the attached figures: 1: Valve body; 11: Inlet; 12: Outlet; 13: Main flow channel; 14: First pressure tap position; 15: Second pressure tap position; 16: Differential pressure generation section; 2: Main valve core assembly; 21: Valve seat; 22: Valve disc; 23: Valve stem; 24: Opening and resetting component; 3: Differential pressure time integration component; 31: Piston chamber; 311: First pressure chamber; 312: Second pressure chamber; 32: Differential pressure piston; 33: Seal; 34: Damping channel; 35: Piston reset component; 36: Trigger rod; 4: Excitation transmission mechanism; 41: Fixed rotating shaft; 42: Short connecting rod; 43: Rotating shaft; 44: Long connecting rod; 45: Excitation connecting rod; 46: Excitation rotating shaft; 47: Trigger rod bracket; 48: Slide groove; 49: Sliding fulcrum; 5: Energy storage component shut down; 51: Limiting plate; 52: Wedge block; 6: Manual reset mechanism; 61: Reset handle; 62: Reset spring; 7: Bypass channel; 71: One-way valve core; 72: Trigger block; 73: Transmission link; 74: Protrusion; 75: Fixed rod; 76: Transmission belt; 77: Ratchet; 78: Reset element; 79: Cam; Detailed Implementation

[0035] These embodiments are provided to make the invention thorough and complete, and to fully express the scope of the invention to those skilled in the art. It should be noted that, unless otherwise specifically stated, the relative arrangement of components and steps, material composition, numerical expressions, and values ​​set forth in these embodiments should be interpreted as merely exemplary and not as limiting.

[0036] This invention relates to a self-locking leak-proof valve that utilizes pressure differential changes generated by continuous flow within a pipeline for mechanical delay-based detection and automatically closes the main flow channel in cases of abnormal continuous flow. This self-locking leak-proof valve does not rely on external power sources, batteries, electronic sensors, or electronic actuators, and can be applied to public restroom water supply pipelines, school water supply branch lines, office building branch lines, industrial cooling water bypass lines, agricultural irrigation branch lines, laboratory water supply branch lines, equipment cooling branch lines, and other fluid transport applications requiring mechanical shut-off of abnormal continuous flow.

[0037] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be understood that the following embodiments are only used to illustrate the technical solutions of the present invention and should not be construed as limiting the scope of protection of the present invention. Where there is no structural conflict, the technical features in the following embodiments can be combined with each other. Example

[0038] like Figures 1 to 3 As shown, this embodiment provides a mechanically triggered self-locking leak-proof valve based on differential pressure time integration. The self-locking leak-proof valve includes a valve body 1, a main valve core assembly 2, a differential pressure time integration assembly 3, an excitation transmission mechanism 4, a closing energy storage component 5, and a manual reset mechanism 6.

[0039] The valve body 1 has an inlet 11, an outlet 12, and a main flow channel 13 connecting the inlet 11 and the outlet 12. Fluid enters the valve body 1 through the inlet 11 and flows along the main flow channel 13 to the outlet 12. The valve body 1 can be made of copper, stainless steel, aluminum alloy, engineering plastics, or other materials suitable for fluid transport valves. For domestic water supply applications, the valve body 1 can be made of copper alloy or stainless steel; for agricultural irrigation branch pipes, an engineering plastic valve body can also be used.

[0040] The main flow channel 13 is provided with a first pressure tapping position 14 and a second pressure tapping position 15 arranged at intervals along the fluid flow direction. The first pressure tapping position 14 is located upstream of the second pressure tapping position 15. A differential pressure generating section 16 is provided between the first pressure tapping position 14 and the second pressure tapping position 15. The first pressure tapping position 14 is connected to the first pressure chamber 311, and the second pressure tapping position 15 is connected to the second pressure chamber 312. When there is a continuously flowing medium in the main flow channel 13, a differential pressure is formed between the first pressure tapping position 14 and the second pressure tapping position 15 due to the differential pressure generating section 16. This differential pressure is transmitted to the first pressure chamber 311 and the second pressure chamber 312, causing the differential pressure piston 32 to tend to move.

[0041] The main valve core assembly 2 is disposed within the main flow channel 13. The main valve core assembly 2 includes a valve seat 21, a valve disc 22, a valve stem 23, and an opening / resetting element 24. The valve seat 21 is fixedly disposed within the main flow channel 13, and the valve disc 22 can pass through the central gap of the valve seat 21. The valve stem 23 is connected to the valve disc 22. The valve disc 22 can move relative to the valve seat 21 with the valve stem 23. When the valve disc 22 leaves the valve seat 21, the inlet 11 and outlet 12 are connected through the main flow channel 13, and the leak-proof valve is in a normally open state. When the valve disc 22 is in contact with the valve seat 21, a sealing fit is formed between the valve disc 22 and the valve seat 21, the main flow channel 13 is cut off, and the leak-proof valve is in a closed state.

[0042] The opening reset element 24 cooperates with the valve disc 22 or the valve stem 23. In this embodiment, the opening reset element 24 is a compression spring, with one end abutting against a spring seat inside the valve body 1 and the other end abutting against the valve stem 23 or a spring stop connected to the valve stem 23. The opening reset element 24 applies an elastic force to the valve stem 23 in the opening direction, so that the valve disc 22 remains away from the valve seat 21 when it is not closed by the closing energy storage element 5. Thus, the main valve core assembly 2 has a normally open property in the untriggered state.

[0043] The differential pressure time integral component 3 is mounted on the valve body 1 and located downstream of the main valve core assembly 2. The differential pressure time integral component 3 includes a piston chamber 31, a differential pressure piston 32, a seal 33, a damping channel 34, and a piston reset component 35. The piston chamber 31 can be integrally formed with the valve body 1, or it can be formed as a separate housing and then fixedly connected to the valve body 1. The differential pressure piston 32 is movably disposed within the piston chamber 31. To enable the piston chamber 31 to form a stable pressure separation, a seal 33 is provided on the outer periphery of the differential pressure piston 32. The seal 33 can be an O-ring, a Y-ring, a lip seal, or other sealing structures suitable for sliding seals. The seal 33 cooperates with the inner wall of the piston chamber 31, allowing relatively independent pressure spaces to be formed on both sides of the differential pressure piston 32, while also allowing the differential pressure piston 32 to move axially along the piston chamber 31.

[0044] The differential pressure piston 32 divides the piston chamber 31 into a first pressure chamber 311 and a second pressure chamber 312. The first pressure chamber 311 is connected to the first pressure tapping position 14, and the second pressure chamber 312 is connected to the second pressure tapping position 15. When there is continuous flow in the main flow channel 13, a pressure difference is formed between the first pressure tapping position 14 and the second pressure tapping position 15, and a corresponding pressure difference is also formed between the first pressure chamber 311 and the second pressure chamber 312. Under the action of this pressure difference, the differential pressure piston 32 moves along the triggering direction.

[0045] The damping channel 34 connects the first pressure chamber 311 and the second pressure chamber 312. The damping channel 34 can be located on the wall of the valve body 1, on the wall of the piston chamber 31, or on the outside of the piston chamber 31. The damping channel 34 can be an elongated damping orifice with a diameter of 0.5mm to 1.5mm and a length of 5mm to 45mm. In one specific embodiment, the diameter of the elongated damping orifice can be 0.8mm and the length can be 40mm. The function of the damping channel 34 is to limit the pressure balance speed between the first pressure chamber 311 and the second pressure chamber 312, preventing the differential pressure piston 32 from instantly reaching the trigger position under the action of the pressure difference, but instead causing it to move at a limited speed. Thus, short-term flow or brief pressure fluctuations will not easily trigger the closing action, while continuous flow allows the differential pressure piston 32 to move gradually under the action of a continuous pressure difference.

[0046] The piston reset member 35 cooperates with the differential pressure piston 32. In this embodiment, the piston reset member 35 is a low-stiffness compression spring. One end of the piston reset member 35 abuts against the end wall of the piston chamber 31, and the other end abuts against the differential pressure piston 32. The main function of the piston reset member 35 is not to close the main valve core assembly 2, but to return the differential pressure piston 32 to its initial position when the main flow channel 13 stops flowing and the pressure difference between the first pressure chamber 311 and the second pressure chamber 312 decreases or disappears. The stiffness of the piston reset member 35 can be selected according to the effective pressure-bearing area of ​​the differential pressure piston 32, the flow resistance of the damping channel 34, and the preset trigger stroke.

[0047] A trigger rod 36 is provided at one end of the piston rod of the differential pressure piston 32.

[0048] The excitation transmission mechanism 4 is mounted on the valve body 1 and located on one side of the piston reset member 35. The excitation transmission mechanism 4 is arranged opposite to the differential pressure piston 32, so that the excitation transmission mechanism 4 can be triggered when the differential pressure piston 32 moves in the triggering direction to the preset triggering stroke.

[0049] The excitation transmission mechanism 4 includes a fixed rotating shaft 41, short connecting rods 42, a rotating shaft 43, a long connecting rod 44, an excitation connecting rod 45, an excitation rotating shaft 46, a trigger rod bracket 47, and a slide groove 48. The fixed rotating shaft 41 is fixedly mounted above the differential pressure time integration component 3, and two short connecting rods 42 are connected to it on the left and right sides. The ends of the two short connecting rods are sequentially connected to the rotating shaft 43 and the long connecting rod 44. The other ends of the two long connecting rods 44 are slidably connected to the slide grooves 48 on the limiting plate 51. Sliding fulcrums 49 are also provided on the two connecting rotating shafts 43. Excitation connecting rods 45 are also provided on the two connecting rotating shafts 43, and the two excitation connecting rods 45 are connected to an excitation rotating shaft 46. A trigger rod bracket 47 is also provided on the excitation rotating shaft 46 to cooperate with the trigger rod 36 to pull the excitation transmission mechanism 4 forward, thereby triggering the shutdown of the energy storage component 5.

[0050] When the pressure difference between the first pressure chamber 311 and the second pressure chamber 312 decreases or disappears, the trigger rod 36 disengages from the trigger rod bracket 47, and the excitation transmission mechanism 4 remains in a holding state. When a pressure difference is generated between the first pressure chamber 311 and the second pressure chamber 312, the pressure difference piston 32 begins to move. When it moves to the preset trigger stroke, the trigger rod 36 contacts the trigger rod bracket 47, causing the excitation shaft 46 to move forward. At this time, the excitation transmission mechanism 4 is in a released state. Since the fixed shaft 41 is fixedly set, the forward movement of the excitation shaft 46 drives the two shafts 43 to move closer together. The long connecting rod 44 is constrained by the sliding fulcrum 49, and then the ends of the two long connecting rods 44 connected to the limiting plate 51 move away from each other, realizing the opening of the two limiting plates 51.

[0051] The closing energy storage component 5 is located on the closing drive side of the main valve core assembly 2. In this embodiment, the closing energy storage component 5 is a closing spring. The closing energy storage component 5 is sleeved on the valve stem 23, with one end abutting against the limiting plate 51 and the other end abutting against the end cap.

[0052] When the actuation transmission mechanism 4 is in the holding state, the closing energy storage component 5 is pressed against by the limiting plate 51 and kept in a compressed state, storing the elastic potential energy of the closing energy storage component 5. The main valve core assembly 2 is in the normally open state under the action of the opening reset component 24. When the actuation transmission mechanism 4 is in the release state, the limiting plate 51 opens to both sides, the closing energy storage component 5 releases its stored energy and pushes the wedge block 52 on the valve stem 23, causing the valve stem 23 to move. The valve stem 23 then drives the valve disc 22 to adhere to the valve seat 21, thereby cutting off the main flow channel 13. To ensure reliable closing action, the elastic force of the closing energy storage component 5 is greater than the elastic force of the opening reset component 24.

[0053] The limiting plate 51 has a slot in the middle that is the same shape as the wedge block 53, and the diameter of the closing energy storage component 5 is smaller than the diameter of the circular hole on the limiting plate 51, so as to ensure that the closing energy storage component 5 can still pass through when the limiting plate 51 is closed.

[0054] The manual reset mechanism 6 is at least partially located on the outside of the valve body 1. In this embodiment, the manual reset mechanism 6 includes a reset handle 61 and a reset spring 62. The reset handle 61 is mounted on the valve stem 23 and located outside the valve body 1. Multiple reset springs 62 are arranged on the outside of the two limiting plates 51, so that they can automatically close after being opened by the activated transmission mechanism. When the valve automatically closes due to abnormal continuous flow, the user can operate the reset handle 61 after troubleshooting the downstream fault. Pulling the reset handle 61 upwards causes the wedge block 52 to move upwards and pass through the slot of the limiting plate 51. Because the wedge block 52 is smaller at the top and larger at the bottom, it can overcome the force of the reset spring 62 and push open the limiting plate 51 when passing through the slot of the same shape. After the wedge block passes through the limiting plate 51, the limiting plate 51 closes again, completing the re-energy storage and locking of the closing energy storage component 5. At the same time, the operation of pulling the reset handle 61 upwards will also move the valve stem 23 upwards, thereby causing the valve disc 22 to leave the valve seat 21, and the main flow channel 13 to reopen.

[0055] The working process of this embodiment is as follows.

[0056] When the downstream water terminal is briefly opened, such as for a user's short-term handwashing, short-term rinsing, or short-term water intake in a laboratory, flow occurs in the main flow channel 13. A pressure difference is formed between the first pressure tapping position 14 and the second pressure tapping position 15, and a pressure difference is also formed between the first pressure chamber 311 and the second pressure chamber 312. The differential pressure piston 32 begins to move under the action of this pressure difference. Due to the damping channel 34 limiting the pressure balance speed between the first pressure chamber 311 and the second pressure chamber 312, the moving speed of the differential pressure piston 32 is limited. When the flow duration is short, the displacement of the differential pressure piston 32 has not yet reached the preset trigger stroke, the trigger rod 36 will not push the trigger rod bracket 47 to complete the release action, the actuation transmission mechanism 4 remains in the holding state, the closing energy storage component 5 is not released, and the main valve core assembly 2 continues to remain in the normally open state.

[0057] When the downstream flow terminal is closed, the flow in the main flow channel 13 stops, and the pressure difference between the first pressure tapping position 14 and the second pressure tapping position 15 gradually disappears. The first pressure chamber 311 and the second pressure chamber 312 gradually balance the pressure through the damping channel 34, and the piston reset member 35 pushes the differential pressure piston 32 back to its initial position. Thereafter, the valve remains open, waiting for the next normal flow.

[0058] When downstream abnormalities occur, such as pipe rupture, faucet left open, hose detachment, joint damage, or equipment terminal shutdown failure, continuous flow persists within the main flow channel 13. This continuous flow creates a persistent pressure difference between the first pressure chamber 311 and the second pressure chamber 312, causing the differential pressure piston 32 to move continuously under this pressure difference. Due to the flow-limiting effect of the damping channel 34, the movement of the differential pressure piston 32 is not instantaneous but rather accumulates gradually with increasing continuous flow time. When the differential pressure piston 32 reaches the preset trigger stroke, the trigger rod 36 pushes the trigger rod bracket 47, causing the excitation transmission mechanism 4 to switch from the holding state to the releasing state. The closing energy storage component 5 is then released, pushing the wedge block 52, which in turn moves the valve stem 23 and valve disc 22. The valve disc 22 then contacts the valve seat 21, cutting off the main flow channel 13. After this, even if the downstream leak point remains open, fluid can no longer flow out of the outlet 12.

[0059] After the valve is closed, the actuation transmission mechanism 4 resets due to the disappearance of the pressure difference, the energy storage component 5 remains in the released state, and the main valve core assembly 2 remains closed. After the fault is cleared, the user operates the reset handle 61 to restore the energy storage component to its stored state. Then, the reset component 24 is opened to disengage the valve disc 22 from the valve seat 21, and the main flow channel 13 reopens. Example

[0060] like Figure 1-3 As shown, this embodiment provides a mechanically controlled differential pressure time-integral triggered self-locking leak-proof valve, equipped with a differential pressure generating section 16, a bypass channel 7, a one-way valve core 71, and an adjustable flow element. The basic structure of this embodiment is the same as that of Embodiment 1, still including a valve body 1, a main valve core assembly 2, a differential pressure time-integral assembly 3, an excitation transmission mechanism 4, a shut-off energy storage component 5, and a manual reset mechanism 6. The main difference between this embodiment and Embodiment 1 is that the differential pressure time-integral assembly 3 also includes a bypass channel 7 and a one-way valve core 71, and an adjustable flow element is provided at the damping channel 34.

[0061] The differential pressure generating section 16 is located between the first pressure tapping position 14 and the second pressure tapping position 15. The differential pressure generating section 16 can be a reduced-bore section, a venturi section, a throttling orifice plate, a partial throttling ring, or a replaceable throttling core. By setting the differential pressure generating section 16, a more stable pressure difference can be formed between the first pressure tapping position 14 and the second pressure tapping position 15 when the main flow channel 13 is continuously flowing. This pressure difference does not directly close the main valve core assembly 2, but rather serves as a trigger signal for the differential pressure time integration component 3.

[0062] A replaceable throttling core can be installed within the differential pressure generating section 16. The replaceable throttling core can have different throttling orifice diameters, different flow channel lengths, or different throttling profiles. By replacing the replaceable throttling core, the magnitude of the differential pressure formed between the first pressure tapping position 14 and the second pressure tapping position 15 under the same flow conditions can be changed, thus allowing the self-locking leak-proof valve to adapt to different pipe diameters, different flow ranges, and different application scenarios. For example, a replaceable throttling core with a smaller trigger flow range can be used in public restroom branch lines, a replaceable throttling core with a larger flow capacity can be used in agricultural irrigation branch lines, and the appropriate throttling parameters can be selected according to the equipment cooling water flow rate in industrial cooling water bypass lines.

[0063] A bypass channel 7 is connected in parallel at both ends of the damping channel 34. A one-way valve core 71 is disposed within the bypass channel 7. The conduction direction of the one-way valve core 71 corresponds to the fluid balance direction between the first pressure chamber 311 and the second pressure chamber 312 when the differential pressure piston 32 is reset. A switch triggering mechanism is provided at the bottom of the one-way valve core 71, and a trigger block 72 is matched with the switch triggering mechanism. When the trigger block 72 abuts against the switch triggering mechanism, the one-way valve core 71 is in the closed state; when the trigger block 72 moves away from the switch triggering mechanism, the one-way valve core 71 is in the open state. The one-way valve core 71 is connected to a transmission link 73, which has a fixed fulcrum in the middle, one end of which is connected to the trigger block 72, and the other end has a protrusion 74.

[0064] A fixing rod 75 is provided at the end of the piston rod of the differential pressure piston 32. A transmission belt 76 is fixed to the fixing rod 75, and the other end of the transmission belt 76 is wound around a ratchet 77 located on one side of the piston rod of the differential pressure piston 32 at its initial position. The ratchet 77 is also provided with a reset member 78, which allows the ratchet 77 to reset after being rotated by the fixing rod 75 and the transmission belt 76, so that the transmission belt 76 can be wound back onto the ratchet 77. A cam 79 is provided on the rear side of the ratchet. When the ratchet 77 moves forward due to the differential pressure piston 32, causing the fixing rod 75 and the transmission belt 76 to rotate, the cam 79 is not driven by the ratchet 77. However, when the ratchet 77 is reset and rotated by the reset member 78, the cam 79 is also driven to rotate. The cam 79 is provided with multiple protrusions around its circumference, and the protrusions can cooperate with the protrusions 74 on the transmission connecting rod 73. As the cam 79 rotates, the protrusion continuously pushes up the protrusion, causing the trigger block 71 to continuously move away from the switching mechanism of the one-way valve core 71, thus keeping the one-way valve core 71 in the open state. Therefore, the one-way valve core 71 opens the bypass channel 7, allowing the first pressure chamber 311 and the second pressure chamber 312 to quickly connect, and the differential pressure piston 32 quickly returns to its initial position under the action of the piston reset member 35.

[0065] The minimum current-carrying cross-sectional area of ​​the bypass channel 7 is preferably larger than that of the damping channel 34. Further, the minimum current-carrying cross-sectional area of ​​the bypass channel 7 can be 5 to 30 times that of the minimum current-carrying cross-sectional area of ​​the damping channel 34. This configuration maintains sufficient damping in the triggering direction while significantly increasing the return speed in the reset direction.

[0066] The adjustable flow element includes a needle valve, an adjusting knob, a scale section, and an adjusting locking element. The needle valve is located in an adjusting channel connected in series or parallel with the damping channel. The adjusting knob is located on the outside of the valve body and connected to the needle valve. When the user rotates the adjusting knob, the needle valve moves relative to the adjusting channel, causing a change in the flow cross-sectional area of ​​the adjusting channel. When the flow cross-sectional area decreases, the pressure balance speed between the first pressure chamber 311 and the second pressure chamber 312 decreases, the movement speed of the differential pressure piston 32 under the same continuous flow conditions decreases, and the delay time required for the valve to trigger closure increases. When the flow cross-sectional area increases, the pressure balance speed between the two pressure chambers increases, the movement speed of the differential pressure piston 32 increases, and the delay time required for the valve to trigger closure shortens.

[0067] The scale can be located around the adjustment knob or on the outer surface of the valve body. The scale can be continuous or have multiple increments. For example, the scale can indicate delay times of 2 minutes, 5 minutes, 10 minutes, etc. In practical use, public restroom branches can have their delay times set to a shorter range based on normal water usage time; agricultural irrigation branches can have their delay times set to a longer range based on the normal continuous flow requirements of the irrigation branch; and industrial cooling water bypasses can have their trigger times set according to the allowable abnormal flow time of the equipment.

[0068] The adjusting locking element cooperates with the adjusting knob. The adjusting locking element can be a locking nut, a spring clip, a locating pin, a ratchet limiter, or other structures that can limit the accidental rotation of the adjusting knob. When the adjusting knob is adjusted to the set position, the adjusting locking element restricts the rotation of the adjusting knob relative to the valve body 1, preventing the delay time from deviating from the set value due to vibration, accidental contact, or arbitrary adjustment by unauthorized personnel.

[0069] This embodiment reduces the risk of false triggering caused by multiple consecutive short-term water usages by setting a one-way bypass structure. For example, in public places, multiple users may use water continuously for short periods. If the differential pressure piston 32 can only slowly return to its initial position through the damping channel 34 after each water usage, then when the interval between two adjacent water usages is short, the differential pressure piston 32 may not have fully returned to its initial position, resulting in residual displacement. By setting the bypass channel 7 and the one-way valve core 71, the reset speed of the differential pressure piston 32 after the water usage stops is increased, which can reduce the possibility of triggering caused by the superposition of multiple short-term water usages.

[0070] This embodiment further improves the valve's adaptability to different usage scenarios. For scenarios with short normal flow duration and high leakage risk requirements, the adjustable flow element can be adjusted to a shorter delay setting; for irrigation branches or equipment cooling branches that require longer continuous flow during normal operation, the adjustable flow element can be adjusted to a longer delay setting. Since the adjusting locking element can limit accidental rotation of the adjusting knob, the stability of the set delay time can be improved. Example

[0071] Based on the above embodiments, the present invention may also employ other specific implementation methods.

[0072] The first pressure tapping position 14 and the second pressure tapping position 15 can be directly opened on the wall of the valve body 1, or they can be connected to the first pressure chamber 311 and the second pressure chamber 312 through pressure tapping pipes, pressure tapping holes, or pressure tapping grooves. In addition to using a reduced diameter section, a Venturi section, a throttling orifice plate, a local throttling ring, or a replaceable throttling core 17, the differential pressure generating section 16 can also use a porous throttling structure, a bent throttling structure, an annular gap throttling structure, or other structures that can form a stable differential pressure when the main flow channel 13 is continuously flowing.

[0073] The differential pressure piston 32 can be a cylindrical piston, or it can be a diaphragm-type moving part, a slider-type moving part, a bellows-type moving part, or other moving parts that can generate displacement under the action of pressure difference. The seal 33 can be a rubber seal ring, a polytetrafluoroethylene seal ring, an elastomer seal ring, or a composite seal, depending on the fluid medium. The damping channel 34 can be a single elongated hole, or it can be multiple parallel or series small holes, throttling slots, capillary channels, or a composite flow channel formed in the detachable damping core 38. The piston reset component 35 can be a compression spring, a tension spring, a spring sheet, a magnetic reset structure, or a gravity reset structure, as long as it can cause the differential pressure piston 32 to return to its initial position after the pressure difference decreases or disappears.

[0074] The valve disc 22 and valve seat 21 can be sealed using a planar seal, conical seal, spherical seal, soft ring seal, or diaphragm seal. The components inside the valve body 1 that come into contact with the fluid can be made of different materials depending on the fluid medium. For ordinary water supply systems, copper, stainless steel, engineering plastics, and food-grade sealing materials can be used. For industrial cooling water or fluids containing a certain degree of corrosiveness, corrosion-resistant metal materials or corrosion-resistant polymer materials can be selected according to the properties of the medium.

[0075] The mechanically differential pressure time-integral triggered self-locking leak-proof valve provided by this invention utilizes the pressure difference formed by the continuous flow of fluid to achieve mechanical delay judgment, and achieves reliable automatic shut-off of the main flow channel through a bistable locking mechanism and a closing energy storage component. This leak-proof valve does not rely on external power sources, batteries, electronic sensors, or electronic actuators, has a relatively simple structure, and is suitable for mass production and long-term installation. This leak-proof valve can be applied to public restrooms, schools, office buildings, industrial cooling water systems, agricultural irrigation systems, laboratory water supply systems, and other pipeline systems requiring prevention of abnormal continuous leakage, demonstrating good industrial applicability.

[0076] The various embodiments of the present invention have now been described in detail. To avoid obscuring the concept of the invention, some details known in the art have not been described. Those skilled in the art can fully understand how to implement the technical solutions of this invention based on the above description.

[0077] It should be noted that, in the description of this invention, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicating orientation or positional relationships, are only for the convenience of describing this invention and 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, and therefore should not be construed as a limitation of this invention. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0078] Furthermore, the terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different parts. "Vertical" is not strictly vertical, but within the permissible range of error. "Parallel" is not strictly parallel, but within the permissible range of error. Terms such as "including" or "comprising" mean that the element preceding the word encompasses the element listed after the word, and do not exclude the possibility of encompassing other elements as well.

[0079] It should also be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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 direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention depending on the specific circumstances. When a specific device is described as being located between a first device and a second device, an intermediary device may or may not be present between the specific device and the first or second device.

[0080] All terms used in this invention have the same meaning as understood by one of ordinary skill in the art to which this invention pertains, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant art, and not as idealized or highly formalized, unless expressly defined herein.

[0081] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of the specification.

[0082] Although specific embodiments of the present invention have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Those skilled in the art should understand that modifications can be made to the above embodiments or equivalent substitutions can be made to some technical features without departing from the scope and spirit of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any manner.

Claims

1. A mechanically differential pressure time-integral triggered self-locking leak-proof valve, characterized in that, It includes the valve body, main valve core assembly, differential pressure time integration assembly, shut-off energy storage component, excitation transmission mechanism, and manual reset mechanism; The valve body is provided with a main flow channel, and the main flow channel is provided with a first pressure tapping position, a differential pressure generating section and a second pressure tapping position in sequence along the fluid flow direction. The main valve core assembly is disposed within the main flow channel and has a normally open state for opening the main flow channel and a closed state for closing the main flow channel. The differential pressure time integration component is disposed in the valve body and located downstream of the main valve core assembly. The differential pressure time integration component includes a piston chamber, a differential pressure piston, a damping channel, and a piston reset component. The differential pressure piston is movably disposed in the piston chamber and divides the piston chamber into a first pressure chamber and a second pressure chamber. The first pressure chamber is connected to the first pressure tapping position, and the second pressure chamber is connected to the second pressure tapping position. The damping channel connects the first pressure chamber and the second pressure chamber. The piston reset component cooperates with the differential pressure piston. The shut-off energy storage device is located on the shut-off drive side of the main valve core assembly, and the shut-off energy storage device cooperates with the excitation transmission mechanism and the main valve core assembly respectively; The excitation transmission mechanism is located on the valve body, connected to the closing energy storage component, and above the differential pressure time integration component; and can switch between holding and releasing states based on the movement of the differential pressure piston of the differential pressure time integration component. The manual reset mechanism is at least partially located on the outside of the valve body and connected to the valve core assembly.

2. The self-locking leak-proof valve triggered by mechanical differential pressure time integration according to claim 1, characterized in that, The main valve core assembly includes a valve seat, a valve disc, a valve stem, and an opening and resetting component. The valve seat is disposed in the main flow channel. The valve disc is connected to the valve stem. The opening and resetting component cooperates with the valve disc or the valve stem and applies a force toward the opening position to the main valve core assembly.

3. The self-locking leak-proof valve triggered by mechanical differential pressure time integration according to claim 2, characterized in that, The closing energy storage component is a closing spring, which is sleeved on the valve stem. When the closing spring is released, it acts on the valve stem to drive the valve disc to form a sealing fit with the valve seat.

4. The self-locking leak-proof valve triggered by mechanical differential pressure time integration according to claim 1, characterized in that, The differential pressure moving part is a differential pressure piston. The outer periphery of the differential pressure piston is provided with a sealing element, which is slidably sealed with the inner wall of the piston chamber. The differential pressure piston is provided with a trigger rod, which is used to trigger the excitation transmission mechanism when the differential pressure piston moves to the preset trigger stroke.

5. The self-locking leak-proof valve triggered by mechanical differential pressure time integration according to claim 1, characterized in that, A differential pressure generation section is provided between the first pressure tapping position and the second pressure tapping position, and an interval section is provided between the first pressure tapping position, the second pressure tapping position and the differential pressure generation section.

6. The self-locking leak-proof valve triggered by mechanical differential pressure time integration according to claim 1, characterized in that, The excitation transmission mechanism includes a fixed rotating shaft, a short connecting rod, a rotating shaft, a long connecting rod, an excitation connecting rod, an excitation rotating shaft, and a trigger rod bracket. One end of the short connecting rod is connected to the fixed rotating shaft, and the other end is connected to the long connecting rod through the rotating shaft. The excitation connecting rod is connected between the rotating shaft and the excitation rotating shaft. The trigger rod bracket is disposed on the excitation rotating shaft and cooperates with the trigger rod of the differential pressure moving part.

7. The self-locking leak-proof valve triggered by mechanical differential pressure time integration according to claim 6, characterized in that, The self-locking leak-proof valve also includes a limiting plate, which cooperates with the closing energy storage component; when the excitation transmission mechanism is in the holding state, the limiting plate restricts the release of the closing energy storage component; when the excitation transmission mechanism is in the releasing state, the limiting plate releases the restriction on the closing energy storage component.

8. The self-locking leak-proof valve triggered by mechanical differential pressure time integration according to claim 7, characterized in that, The valve stem is provided with a wedge-shaped block, and the limiting plate is provided with a slot that cooperates with the wedge-shaped block; the self-locking anti-leakage valve also includes a manual reset mechanism, which includes a reset handle and a reset spring. The reset handle is connected to the valve stem, and the reset spring cooperates with the limiting plate to reset the limiting plate and re-limit the closing energy storage component after the wedge-shaped block passes through the slot.

9. The self-locking leak-proof valve triggered by mechanical differential pressure time integration according to claim 1, characterized in that, The differential pressure time integration component also includes a bypass channel and a one-way valve core. The bypass channel is arranged in parallel at both ends of the damping channel, and the one-way valve core is disposed in the bypass channel. The conduction direction of the one-way valve core corresponds to the fluid balance direction between the first pressure chamber and the second pressure chamber when the differential pressure moving part is reset.

10. The self-locking leak-proof valve triggered by mechanical differential pressure time integration according to claim 9, characterized in that, The differential pressure time integration component also includes a ratchet, a reset component, a cam, a transmission link, and a trigger block that are linked to the differential pressure moving component. When the differential pressure moving component moves along the triggering direction, it drives the ratchet to rotate. When the reset component drives the ratchet to reset, it drives the cam to rotate. The cam drives the trigger block away from the switch triggering mechanism of the one-way valve core through the transmission link, so that the one-way valve core opens the bypass channel.

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