A mechanical micro-leakage detection self-closing valve

Abstract

This invention provides a mechanical micro-leakage detection self-closing valve, comprising a housing with an inlet and an outlet at each end, an automatic locking and sealing mechanism disposed within the housing, and a fast-response mechanism and a delayed-response mechanism disposed on one side of the housing. The automatic locking and sealing mechanism reciprocates within the housing to open and close the inlet. The fast-response mechanism includes a pull rod, and the delayed-response mechanism includes a locking piston rod. When the housing inlet is closed, if the flow rate at the housing outlet is high, the locking piston rod reaches its working position later than the pull rod; when the flow rate at the housing outlet is low, the locking piston rod reaches its working position no later than the pull rod. This self-closing valve can achieve self-closing under various conditions such as overpressure, high temperature, underpressure, micro-leakage, and overcurrent. Its ingenious structural design and high stability greatly ensure the safety of gas usage.

Description

Technical Field

[0001] This invention belongs to the field of valve control technology, specifically relating to a mechanical micro-leakage detection self-closing valve. Background Technology

[0002] A piped gas automatic shut-off valve, or simply automatic shut-off valve, is a safety device installed on low-pressure gas pipelines. It automatically closes the gas supply without the need for electricity or other external power when the pressure is low, high, or interrupted. It is designed to prevent manual opening. With the increasing prevalence of residential gas pipelines, the use of piped gas automatic shut-off valves is also growing.

[0003] However, existing self-closing valves have relatively simple and specific functions, typically only including the most basic functions of automatic shut-off due to overpressure / underpressure and automatic shut-off due to overcurrent. These overpressure / underpressure issues can generally be detected and addressed during pipeline installation and regular inspections. Currently, micro-leakage is considered the greatest safety threat posed by gas usage.

[0004] Therefore, gas self-closing valves with micro-leak detection functions have emerged. Although they are all called micro-leak self-closing valves, in essence, they do not have the function of automatic real-time monitoring of micro-leaks or automatic shut-off when a micro-leak occurs. They can only serve as temporary auxiliary detection tools for manual verification of whether there are micro-leaks in the pipeline. Alternatively, they can only monitor whether there are leaks in the existing self-closing valve itself, and cannot automatically monitor and shut off the entire downstream pipeline that needs the self-closing valve protection for leaks in real time. Moreover, the opening and closing parts of the existing micro-leak self-closing valves are in the form of rubber plugs. In the event of a fire, if the rubber plug melts, it will still lead to a large amount of gas leakage, thereby exacerbating the fire.

[0005] Therefore, developing a self-closing valve that is highly stable and can automatically shut off in response to both micro-leakage and high-temperature (fire) conditions is a technical problem that urgently needs to be solved. Summary of the Invention

[0006] This invention provides a mechanical micro-leakage detection self-closing valve that can automatically close after detecting micro-leakage in fluids and under high-temperature conditions.

[0007] The objective of this invention is achieved through the following technical solution: A mechanical micro-leakage detection self-closing valve includes, A housing, wherein an inlet and an outlet are respectively provided at both ends of the housing; An automatic locking and sealing mechanism is installed inside the housing, and reciprocates within the housing to open and close the inlet of the housing. A quick-response mechanism is disposed on one side of the housing and includes a pull rod that passes through the housing and reciprocates within the housing; A delayed response mechanism, disposed on one side of the housing, includes a locking piston rod passing through the housing, the locking piston rod reciprocating within the housing; When the automatic locking and sealing mechanism closes the inlet of the housing, and the fluid flow rate at the outlet of the housing is within the normal operating range, the time it takes for the locking piston rod to reach the working position inside the housing is later than the time it takes for the pull rod to reach the working position inside the housing. When the outlet flow rate of the housing is within the flow range of micro-leakage, the time it takes for the locking piston rod to reach the working position within the housing is no later than the time it takes for the pull rod to reach the working position within the housing; the working position is the position where the function is performed.

[0008] Preferably, the automatic locking and sealing mechanism includes a support shell coaxial with the housing and a piston-type locking assembly disposed within the support shell. The automatic locking and sealing mechanism is provided with a through hole for fluid communication with the housing. The piston-type locking assembly includes a piston rod passing through the support shell, on which a piston assembly is disposed. One end of the piston rod extends through the support shell toward the housing inlet to form a sealing end, and the other end of the piston rod extends through the support shell toward the housing outlet to form a locking end. The piston-type locking assembly moves within the support shell and opens and closes the housing inlet through the sealing end. The piston rod is provided with a locking assembly at its locking end, which is connected to the locking end to realize the locking of the piston-type locking assembly.

[0009] Preferably, the inlet of the shell is provided with a membrane, the membrane has a through hole in the middle, and the sealing end is a metal end, which cooperates with the membrane to form a sealed or open structure.

[0010] Preferably, the piston assembly is located at the blocking end or locking end of the piston rod, including a piston cover fitted on the piston rod and a spring disposed within the piston cover; when the piston assembly is located at the blocking end of the piston rod, the piston cover and the blocking end of the piston rod can also be integrally formed.

[0011] Preferably, the piston assembly includes a piston cap fitted onto the piston rod and a spring disposed within the piston cap. A U-shaped diaphragm is disposed between the piston cap and the support shell, and a vent hole is provided on the U-shaped diaphragm.

[0012] Preferably, the delayed response mechanism includes a housing and a delayed piston assembly disposed within the housing. The delayed piston assembly includes a locking piston rod, the lower end of which extends downward into the housing to form a locking end, and the upper end of which extends upward out of the housing and connects to the lifting shell. A locking groove is provided on the piston rod. When the delayed piston assembly is in operation, it drives the locking end to lock or unlock the piston rod inside or outside the locking groove.

[0013] Preferably, the rapid response mechanism includes a response housing and a rapid piston assembly disposed within the response housing. The rapid piston assembly includes a pull rod, the lower end of which extends into the housing, and the upper end of which extends upward out of the response housing. A through hole is provided between the response housing and the housing to facilitate fluid flow.

[0014] Preferably, a pull cap is provided above the response housing, and a reset pull rod is vertically arranged downward inside the pull cap. The bottom end of the reset pull rod extends into the response housing and is built into the pull rod. The bottom end of the reset pull rod and the top end of the pull rod are mutually matched and separable. A reset spring is provided between the top of the quick piston assembly and the response housing.

[0015] Preferably, the lower end of the pull rod is pivotally connected to the connecting rod propulsion assembly, which includes a first connecting rod and a second connecting rod connected end to end. One end of the first connecting rod is connected to the outlet end of the housing, and one end of the second connecting rod is located at the piston rod locking end. A tension spring is also provided between the middle of the first connecting rod and the outlet end of the housing.

[0016] Preferably, the locking assembly includes a locking rod, which is connected to the support shell via a tension spring. One end of the support shell is provided with a sliding groove along the axial direction. One end of the second connecting rod is placed in the sliding groove, and the tail end of the locking rod is placed in the bayonet at the lower end of the pull rod.

[0017] Preferably, a shape memory alloy spring is provided inside the housing, and the shape memory alloy spring is located below the bottom end of the pull rod.

[0018] Preferably, a filter screen is provided at the inlet end of the housing, the filter screen is located outside the membrane, and a ball valve is provided at the outlet end of the housing, with an overflow valve provided inside the ball valve.

[0019] The beneficial effects of this invention are reflected in the fact that the self-closing valve of this invention can achieve self-closing under various conditions such as overpressure, high temperature, underpressure, micro-leakage, and overcurrent. It has an ingenious structural design, high stability, and greatly ensures the safety of gas use. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 : A three-dimensional structural schematic diagram of the present invention.

[0022] Figure 2 This invention Figure 1 A schematic diagram of the cross-sectional structure.

[0023] Figure 3 : A schematic diagram of the automatic locking and sealing mechanism of the present invention, which includes a locking component.

[0024] Figure 4 : A schematic diagram of the fast response mechanism structure of the present invention.

[0025] Figure 5 : Schematic diagram of the delayed response mechanism of the present invention.

[0026] Figure 6 : Schematic diagram of the linkage propulsion assembly structure of the present invention.

[0027] Figure 7 : A schematic diagram of the structure of the inlet end of the housing of the present invention.

[0028] Figure 8 : A schematic diagram showing the relationship between the U-shaped diaphragm and the piston cover in the open state of the automatic locking and sealing mechanism of this invention.

[0029] Figure 9 : A schematic diagram showing the relationship between the U-shaped diaphragm and the piston cover in the closed state of the automatic locking and sealing mechanism of this invention.

[0030] Figure 10 : A schematic diagram of the second embodiment of the present invention, in which the piston assembly is placed at the sealing end of the piston rod.

[0031] Figure 11 : A schematic diagram of the structure of the third embodiment of the present invention, in which the piston cover and the sealing end are integrally set. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this invention clearer, the following description is provided in conjunction with the appendix. Figures 1-11 The present invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0033] This invention proposes a mechanical micro-leakage detection self-closing valve, comprising a housing 1, an automatic locking and sealing mechanism 2 disposed within the housing 1, and a fast response mechanism 3 and a delayed response mechanism 4 disposed on one side of the housing 1. An inlet 11 and an outlet 12 are respectively disposed at both ends of the housing 1. The automatic locking and sealing mechanism 2 reciprocates within the housing 1 to open and close the inlet. A ball valve 13 is disposed at the outlet end of the housing 1, and an overflow valve 14 is disposed inside the ball valve 13.

[0034] The rapid response mechanism 3 includes a pull rod 31 passing through the housing, and the delayed response mechanism 4 includes a locking piston rod 41 passing through the housing. Both the pull rod 31 and the locking piston rod 41 can reciprocate within the housing 1 in a direction perpendicular to the direction of the housing inlet and outlet.

[0035] When the automatic locking and sealing mechanism 2 blocks the inlet 11 of the housing 1 and puts it in a closed state, the fluid flow at the outlet 12 of the housing 1 is relatively large, that is, within the normal operating range. When the locking piston rod 41 moves to the working position in the housing 1 later than the pull rod 31 moves to the working position in the housing. When the flow rate at outlet 12 of housing 1 is low, i.e. within the flow rate range of micro-leakage, the time it takes for the locking piston rod 41 to reach the working position within housing 1 is no later than the time it takes for the pull rod 31 to reach the working position within housing 1; the working position is the position where the function is performed.

[0036] The automatic locking and sealing mechanism 2 includes a support shell 21 coaxial with the housing 1 and a piston-type locking assembly disposed within the support shell 21. The automatic locking and sealing mechanism 2 is provided with a through hole for fluid communication with the housing 1. In this embodiment, the through hole is disposed on the end face of the support shell 21. The piston-type locking assembly includes a piston rod 22 passing through the support shell 21. A piston assembly is disposed on the piston rod 22. One end of the piston rod 22 extends through the support shell 21 toward the inlet end of the housing 1 to form a sealing end 221, and the other end of the piston rod 22 extends through the support shell 21 toward the outlet end of the housing to form a locking end 222. The piston-type locking assembly moves within the support shell 21 and opens and closes the housing inlet through the sealing end 221.

[0037] The piston assembly is located at the locked end of the piston rod 22. It includes a piston cap 23 fitted onto the piston rod 22 and a spring 24 disposed within the piston cap 23. A U-shaped membrane 25 is disposed between the piston cap 23 and the support shell 21, and a vent hole 251 is provided on the U-shaped membrane 25. Further, the U-shaped membrane 25 is an elastic membrane covering the piston cap 23, with its upper end folded outward to form a flange, the outer side of which abuts against the inner wall of the support cap. The vent hole 251 is disposed close to the piston cap 23, and as the piston assembly moves, the vent hole 251 switches between a closed and open state with the space inside the support shell. That is, when the vent hole 251 on the U-shaped membrane 25 is tightly fitted with the piston cap 23, it is in a closed state; when the vent hole 251 is connected between the piston cap 23 and the support shell, it is in an open state.

[0038] The piston rod 22 has a locking end 222 equipped with a locking assembly, which is connected to the locking end to achieve locking of the piston-type locking assembly.

[0039] Specifically, the locking end 222 is provided with a locking slot 2221, and the locking assembly includes a locking pressure rod 71 pivotally connected to the outside of the support shell. The upper end of the locking pressure rod 71 is connected to the outside of the support shell 21 via a tension spring 42. The front end of the locking pressure rod 71 abuts against the locking slot 2221 to lock the locking end of the piston rod 22. The tail end 711 of the locking pressure rod 71 is placed in the latch 311 at the lower end of the pull rod. Under the force of the tension spring 42 and the latch 311, the locking pressure rod 71 rotates around the pivot point 712, realizing the switching between locking and unlocking the locking end of the piston rod 22.

[0040] The rapid response mechanism 3 includes a response housing 32 and a rapid piston assembly disposed within the response housing. The rapid piston assembly includes a pull rod 31 and a rapid piston portion. The lower end of the pull rod 31 extends into the housing 1, and the upper end of the pull rod 31 extends upward out of the response housing 32. A rapid through-hole 33 is provided between the response housing 32 and the housing 1 to facilitate fluid flow. The rapid through-hole 33 ensures that the cross-sectional area of ​​the connection channel between the rapid response mechanism and the housing is larger than the cross-sectional area of ​​the connection channel between the delayed response mechanism and the housing.

[0041] The fast piston section includes a fast piston cover and a fast response spring 321 disposed inside the fast piston cover, and a fast response diaphragm is disposed between the fast piston cover and the fast response spring 321.

[0042] A pull cap 34 is provided above the response housing 32. A reset pull rod 35 is vertically arranged downward inside the pull cap 34. The bottom end of the reset pull rod 35 extends into the response housing 32 and is built into the pull rod 31. The bottom end of the reset pull rod 35 and the top end of the pull rod 31 are mutually matched and detachable. The detachable connection can be a magnetic connection, etc., and is not limited here. A reset spring 36 is provided between the top of the fast piston assembly and the response housing 32.

[0043] The lower end of the pull rod 31 is pivotally connected to the connecting rod propulsion assembly. The connecting rod propulsion assembly includes a first connecting rod 61 and a second connecting rod 62 connected end to end. One end of the first connecting rod 61 is connected to the outlet end of the housing 1, and one end of the second connecting rod 62 is located at the piston rod locking end. Specifically, a sliding groove 211 is provided axially on the outer side of the support housing 21. One end of the second connecting rod 62 is placed in the sliding groove 211, and the second connecting rod 62 will reciprocate within the sliding groove 211. A tension spring 63 is also provided between the middle of the first connecting rod 61 and the outlet end of the housing.

[0044] A shape memory alloy spring 15 is installed inside the housing 1, and the shape memory alloy spring 15 is located below the bottom end of the pull rod 31. When the temperature inside the housing reaches the deformation temperature of the shape memory alloy spring 15, the shape memory alloy spring 15 will extend upward, thereby abutting against the pull rod 31 and driving the pull rod 31 to move upward. At this time, the connecting rod propulsion assembly will be activated, and the second connecting rod 62 will move along the direction of the piston rod 22, pushing the piston rod 22 towards the inlet of the housing, thereby sealing the inlet of the housing.

[0045] The delayed response mechanism 4 includes a housing 42 and a delayed piston assembly disposed within the housing 42. The delayed piston assembly includes a locking piston rod 41 and a locking piston assembly disposed on the locking piston rod 41. The lower end of the locking piston rod 41 extends downward into the housing 1 to form a locking end 411. The gas connection between the delayed response mechanism and the housing is formed by the gap between the lower end of the locking piston rod 41 and the housing.

[0046] The upper end of the locking piston rod 41 extends upward beyond the cover 42 and connects to the lifting shell 43. The locking piston assembly includes a locking piston cover and a locking spring 421 disposed inside the locking piston cover, with a locking diaphragm disposed between the locking piston cover and the locking spring 421.

[0047] In this embodiment, the spring force of the locking spring 421 in the delayed response mechanism 4 is greater than the spring force of the fast response spring 321 in the fast response mechanism 3.

[0048] The piston rod 22 has a locking groove 223. When the delayed piston assembly operates, it drives the locking end 411 to lock or unlock the piston rod inside or outside the locking groove 223. When the locking end 411 enters the locking groove 223, the piston rod is locked, restricting its movement; otherwise, it is in the unlocked state.

[0049] In this embodiment, the inlet 11 of the housing 1 is provided with a membrane 13, the membrane 13 having a through hole in the middle, and the sealing end 221 being a metal end, which cooperates with the membrane 13 to form a sealed or open structure. Using a metal sealing end can prevent sealing failure due to material issues under conditions of high temperature during fire or overpressure in the pipeline. To provide preliminary impurity blocking before fluid entry, a filter screen is provided at the inlet of the housing, located on the outside of the membrane 13.

[0050] Of course, the automatic locking and sealing mechanism 2 of the present invention has other alternative implementations. Specifically, it differs from the above-described automatic locking and sealing mechanism in the position and structure of the piston assembly. The piston assembly is positioned at the sealing end of the piston rod 22, including a piston cap fitted onto the piston rod and a spring disposed within the piston cap. In this case, the piston cap and the support shell are tightly connected, eliminating the need for the U-shaped diaphragm. Alternatively, when the piston assembly is positioned at the sealing end of the piston rod, the piston cap and the sealing end of the piston rod can be integrally formed.

[0051] However, the above methods all share the same principle for achieving micro-leak detection and self-closing. To better understand this invention, the following description uses a preferred embodiment with a U-shaped diaphragm as an example of self-closing for micro-leak detection in a gas pipeline, illustrating the operation process under different conditions. In use, the self-closing valve of this invention is placed in one of the following five conditions: micro-leakage, high temperature (fire), overpressure, underpressure, and overcurrent. In use, the self-closing valve of this invention is placed inside the gas pipeline at the front end of a household gas stove, with its inlet end connected to the outlet of the gas pipeline, and its outlet end connected to the inlet end of a household gas valve.

[0052] Scenario 1: During normal use.

[0053] When the micro-leakage self-closing valve is normally open and the user's gas line is opened, gas enters the housing from the inlet and flows out from the outlet in a large flow rate. At this time, the lever 31 of the fast response mechanism 3 and the locking piston rod 41 in the delayed response mechanism 4 of the micro-leakage self-closing valve are both in the working position, and the automatic locking sealing mechanism 2 is also in the open state. Gas flows normally in the gas pipeline.

[0054] When the gas supply terminal (such as a gas stove) is normally closed, the lever 31 of the quick response mechanism 3 and the locking piston rod 41 of the delayed response mechanism 4 remain in the working position. At this time, the micro-leakage self-closing valve enters a state of temporary gas supply cut-off for automatic micro-leakage monitoring. Specifically, at this time, the gas pressure inside the self-closing valve quickly reaches equilibrium, the pressure difference before and after the U-shaped diaphragm disappears, and it will no longer be subject to force. The piston assembly, driven by the spring 24, will drive the piston rod to move towards the inlet of the housing, sealing the inlet end of the housing and achieving the closure of the self-closing valve inlet. The locking lever 71 of the locking assembly will abut against the locking end of the piston rod for temporary locking, and the automatic locking sealing mechanism 2 will enter the closed state to cut off the gas inlet pipeline. The self-closing valve will automatically switch to the micro-leakage automatic detection state. All pipelines from the valve body to the terminal—such as the gas stove—are within the monitoring range. If a micro-leakage occurs at any point within this range, the self-closing valve will be triggered and enter a continuously closed state.

[0055] When the gas circuit is opened (the micro-leakage self-closing valve is normally open), the pull rod 31 of the rapid response mechanism 3 quickly descends, pushing down the tail end 712 of the locking rod 71 through the upper end of the bayonet 311. This causes the front end of the locking rod 71 to rise, opening the locking assembly, which is now in the unlocked state. The sealing end of the piston rod in the automatic locking sealing mechanism 2 is pushed open by the air pressure, and the automatic locking sealing mechanism 2 enters the open state. At this time, the micro-leakage self-closing valve is in the open, ventilated state.

[0056] Scenario 2: When a minor leak occurs within the pipeline protected by the self-closing valve.

[0057] When the gas circuit is closed and a micro-leak occurs, the gas flow rate of the micro-leak is less than the gas flow rate that can pass between the delayed response mechanism 4 and the housing 1. Therefore, the gas pressure in the self-closing valve will not drop rapidly with the replenishment of gas in the delayed response mechanism 4. At the same time, the gas pressure generated by the locking spring 421 in the delayed response mechanism 4 is greater than the gas pressure generated by the fast response spring 321 in the fast response mechanism 3. Therefore, the locking piston rod 41 in the delayed response mechanism 4 will descend first, and the pull rod 31 in the fast response mechanism 3 will not descend before the locking piston rod 41 descends to the bottom. When the leakage reaches the set volume, the locking piston rod 41 in the delayed response mechanism 4 will first insert into the locking groove 223 of the piston rod, so that the self-closing valve enters the continuously closed state.

[0058] After a period of time, as the air pressure in the self-closing valve further decreases, the pull rod 31 in the rapid response mechanism 3 begins to slowly descend, and then opens the locking component of the automatic locking sealing mechanism 2 (even if the piston rod 22 has space and tendency to move towards the outlet end, at this time, because the locking piston rod 41 in the delayed response mechanism 4 has been inserted into the locking groove 223, the self-closing valve enters a continuously closed state, so the piston rod 22 remains stationary, and the self-closing valve remains in a continuously closed state).

[0059] After eliminating the micro-leakage, when reopening the micro-leakage self-closing valve, manually pull the lifting shell 43 to disengage the locking piston rod 41 from the locking groove 223. Since the pull rod 31 in the rapid response mechanism 3 has already opened the locking component of the automatic locking sealing mechanism 2, the automatic locking sealing mechanism 2 is immediately opened, the pipeline is vented, and the gas enters the delayed response mechanism 4 along the gap groove between the locking piston rod 41 and the housing. Therefore, the locking piston rod 41 in the delayed response mechanism 4 remains in the normal open position, and the self-closing valve enters the open state.

[0060] Scenario 3: When high temperature (fire) occurs.

[0061] When a high temperature (fire) occurs, the shape memory alloy spring 15 recovers its elasticity, pushing the pull rod 31 to move upward. The pull rod 31 drives the first link and the second link to move upward. The second link 62 slides to the right along the slide groove 211, pushing the piston rod 22 to move to the right, causing the self-closing valve to close.

[0062] Scenario 4: When overpressure occurs in the gas line.

[0063] When the gas path is overpressurized, the rapid piston pulls the lever 31 upwards. The lever 31 then moves the first and second connecting rods upwards. The slide groove 211 of the second connecting rod 62 slides to the right, pushing the piston rod 22 to the right, thus closing the self-closing valve. Simultaneously, because the bottom end of the reset lever 35 and the top end of the lever 31 are magnetically connected, the self-closing valve remains continuously closed.

[0064] Once the overpressure is released, manually pull the cap 34 to separate the reset lever 35 from the lever 31. The lever 31 moves downwards under the action of the rapid-response spring, and the first connecting rod, under the action of the tension spring, pulls the second connecting rod downwards, completing the reset.

[0065] Scenario 5: When there is low pressure in the gas line.

[0066] When the self-closing valve experiences underpressure, the force exerted by the air pressure on the piston assembly of the automatic locking sealing mechanism 2 is insufficient to overcome the elastic force of the spring 24. Under the push of the spring 24, the automatic locking sealing mechanism 2 automatically closes, and the micro-leakage self-closing valve is in the closed state.

[0067] Situation 6: When there is overflow in the gas path.

[0068] When overflow occurs in the gas path, the overflow valve 14 quickly cuts off the gas pipeline, and the gas pressure inside the self-closing valve quickly reaches equilibrium. At this time, the pressure difference across the U-shaped diaphragm disappears, and it is no longer subjected to force. Then, under the push of the spring 24, the piston assembly drives the piston rod 22 to move towards the inlet end of the housing, closing the inlet of the self-closing valve. At the same time, the locking assembly locks the locking end of the piston rod under the action of the tension spring. When the manual ball valve 13 is manually closed to handle the overflow problem, since the overflow valve 14 is not absolutely sealed, the gas pressure at the front and rear ends of the overflow valve 14 reaches equilibrium after a period of time, and the overflow valve automatically resets under the action of the return spring.

[0069] Finally, it should be noted that the terms "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 present 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 present 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.

[0070] Furthermore, the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. 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 of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A mechanical micro-leakage detection self-closing valve, characterized in that: include, A housing, wherein an inlet and an outlet are respectively provided at both ends of the housing; An automatic locking and sealing mechanism is installed inside the housing, and reciprocates within the housing to open and close the inlet of the housing. A quick-response mechanism is disposed on one side of the housing and includes a pull rod that passes through the housing and reciprocates within the housing; A delayed response mechanism, disposed on one side of the housing, includes a locking piston rod passing through the housing, the locking piston rod reciprocating within the housing; When the automatic locking and sealing mechanism closes the inlet of the housing, and the fluid flow rate at the outlet of the housing is within the normal operating range, the time it takes for the locking piston rod to reach the working position inside the housing is later than the time it takes for the pull rod to reach the working position inside the housing. When the outlet flow rate of the housing is within the flow range of micro-leakage, the time it takes for the locking piston rod to reach the working position within the housing is no later than the time it takes for the pull rod to reach the working position within the housing; the working position is the position where the function is performed. The automatic locking and sealing mechanism includes a support shell coaxial with the housing and a piston-type locking assembly disposed within the support shell. The automatic locking and sealing mechanism is provided with a through hole for fluid communication with the housing. The piston-type locking assembly includes a piston rod passing through the support shell, a first piston assembly disposed on the piston rod, one end of the piston rod extending through the support shell towards the housing inlet to form a sealing end, and the other end of the piston rod extending through the support shell towards the housing outlet to form a locking end. The piston-type locking assembly moves within the support shell and opens and closes the housing inlet through the sealing end. The piston rod has a locking assembly at its locking end, which connects to the locking end to achieve locking of the piston-type locking assembly. The delayed response mechanism includes a housing and a delayed piston assembly disposed within the housing. The delayed piston assembly includes a locking piston rod, the lower end of which extends downward into the housing to form a locking end, and the upper end of which extends upward out of the housing to connect with the lifting shell. A locking groove is provided on the piston rod. When the delayed piston assembly operates, it drives the locking end to lock or unlock the piston rod inside or outside the locking groove. The rapid response mechanism includes a response housing and a rapid piston assembly disposed within the response housing. The rapid piston assembly includes a pull rod, the lower end of which extends into the housing. A through hole is provided between the response housing and the housing to facilitate fluid flow. The first piston assembly includes a piston cap sleeved on a piston rod and a spring disposed within the piston cap.

2. The mechanical micro-leakage detection self-closing valve as described in claim 1, characterized in that: The inlet of the shell is provided with a membrane, and the membrane has a through hole in the middle. The sealing end is a metal end, which cooperates with the membrane to form a sealed or open structure.

3. The mechanical micro-leakage detection self-closing valve as described in claim 2, characterized in that: The first piston assembly is placed at the sealing end or locking end of the piston rod; when the first piston assembly is placed at the sealing end of the piston rod, the piston cover and the sealing end of the piston rod are integrally formed.

4. The mechanical micro-leakage detection self-closing valve as described in claim 2, characterized in that: A U-shaped membrane is provided between the piston cover and the support shell, and a vent hole is provided on the U-shaped membrane.

5. The mechanical micro-leakage detection self-closing valve as described in claim 1, characterized in that: The upper end of the pull rod extends upward into a response cover.

6. The mechanical micro-leakage detection self-closing valve as described in claim 1, characterized in that: A pull cap is provided on the top of the response housing, and a reset pull rod is vertically arranged downward inside the pull cap. The bottom end of the reset pull rod extends into the response housing and is built into the top of the pull rod. The bottom end of the reset pull rod and the top end of the pull rod are mutually matched and separable. A reset spring is provided between the top of the quick piston assembly and the response housing.

7. The mechanical micro-leakage detection self-closing valve as described in claim 1, characterized in that: The lower end of the pull rod is pivotally connected to the connecting rod propulsion assembly. The connecting rod propulsion assembly includes a first connecting rod and a second connecting rod connected end to end. One end of the first connecting rod is connected to the outlet end of the housing, and one end of the second connecting rod is located at the piston rod locking end. A first tension spring is also provided between the middle part of the first connecting rod and the outlet end of the housing.

8. The mechanical micro-leakage detection self-closing valve as described in claim 7, characterized in that: The locking assembly includes a locking rod, which is connected to the support shell via a second tension spring. One end of the support shell is provided with a sliding groove along the axial direction. One end of the second connecting rod is placed in the sliding groove, and the tail end of the locking rod is placed in the bayonet at the lower end of the pull rod.

9. A mechanical micro-leakage detection self-closing valve as described in claim 1, characterized in that: A shape memory alloy spring is provided inside the housing, and the shape memory alloy spring is located below the bottom end of the pull rod.

10. A mechanical micro-leakage detection self-closing valve as described in any one of claims 1-9, characterized in that: The inlet of the housing is provided with a membrane, and the inlet end of the housing is also provided with a filter screen, which is located outside the membrane. The outlet end of the housing is provided with a ball valve, and the inside of the ball valve is provided with an overflow valve.

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