Gas pipeline decompression self-closing system
By setting up a pressure-free self-closing system with normally open solenoid valves and pressure switches on the gas pipeline, the problem of leakage caused by pressure loss in the gas pipeline is solved, and the intake end is automatically closed, improving safety performance.
Patent Information
- Application Number
- CN202421950210.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-13
- Publication Date
- 2025-05-02
- Estimated Expiration
- 2034-08-13
AI Technical Summary
After long-term use, gas pipelines will have gaps due to corrosion or weld cracks, resulting in gas leakage. The existing technology cannot effectively close the intake end of the gas pipeline, causing safety hazards.
Design a gas pipeline pressure-free self-closing system, which includes setting a normally open solenoid valve at the inlet end of the gas pipeline and setting a pressure switch at the outlet end. The pressure switch controls the on-off of the normally open solenoid valve through the coordination of the trigger and the return spring to ensure that the inlet end is automatically closed when the pressure is lost.
It realizes automatic closing of the intake end when the gas pipeline is out of pressure, preventing gas leakage, improving safety performance, and avoiding safety hazards caused by leakage.
Smart Images
Figure CN222823779U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of gas pipelines, in particular to a gas pipeline pressure loss self-closing system. Background Art
[0002] After long-term use, gas pipelines may be breached due to corrosion or weld cracks, leading to gas leakage. If gas leakage is not handled in time, it can easily cause safety hazards. However, conventional underpressure valves can only disconnect the current position and cannot close the gas inlet end of the gas pipeline. The leak point will continue to leak, and the solenoid valve cannot directly detect whether the gas pipeline is underpressure. Utility Model Content
[0003] The technical problem to be solved by the utility model is to provide a gas pipeline pressure loss self-closing system capable of closing a normally closed electromagnetic valve at an air inlet end when pressure is lost.
[0004] In order to solve the above problems, the utility model provides a gas pipeline pressure-loss self-closing system, which comprises a normally open solenoid valve arranged at the gas inlet end of the gas pipeline and a pressure switch arranged at the gas outlet end of the gas pipeline, wherein the pressure switch is electrically connected to the normally open solenoid valve, and the pressure switch is used to control the on and off of the normally open solenoid valve; the pressure switch comprises a shell, a sealing membrane, a trigger, a reset spring and a travel switch, wherein the sealing membrane is fixed on the shell to divide the shell into a closed cavity and an open cavity, the shell is installed on the gas pipeline, the open cavity is connected to the gas pipeline, the trigger is fixed on the sealing membrane, the trigger, the reset spring and the travel switch are all located in the closed cavity, the reset spring is used to reset the sealing membrane, the trigger is used to touch the travel switch, and the travel switch is used to connect and disconnect the normally open solenoid valve.
[0005] Furthermore, the trigger includes a connecting rod and a trigger member, the trigger member is mounted on the connecting rod, the return spring is sleeved on the connecting rod, and the connecting rod is fixed on the sealing membrane.
[0006] Furthermore, the triggering member is disc-shaped.
[0007] Furthermore, the connecting rod is fixed to the sealing membrane via a locking piece, the locking piece is screwed on the connecting rod, and the locking piece has an anti-slip plate.
[0008] Furthermore, the shell includes a lower shell, an intermediate shell and an upper shell, the upper shell is installed on the intermediate shell, the intermediate shell is installed on the lower shell, the lower shell and the intermediate shell clamp and fix the sealing membrane, the intermediate shell is provided with a guide hole, the guide hole is used to guide the trigger to move vertically up and down, the travel switch is fixed on the upper shell, the sealing membrane and the lower shell are enclosed to form an open cavity, and the sealing membrane, the intermediate shell and the upper shell are enclosed to form a sealed cavity.
[0009] Furthermore, the lower shell is tubular, and a positioning groove for positioning the sealing film is provided on the lower shell.
[0010] Furthermore, the intermediate shell includes a body and a guide column integral with the body, the middle portion of the body protrudes upward, the guide column is located in the middle portion of the body, a guide hole is provided on the guide column, and the guide hole passes through the guide column and the body.
[0011] Furthermore, a sealing ring is provided between the upper shell and the intermediate shell.
[0012] Furthermore, a positioning protrusion is provided on the outer edge of the sealing film.
[0013] Furthermore, a limiting ring is provided in the middle of the sealing membrane, and the limiting ring is used to limit the return spring.
[0014] The utility model discloses a gas pipeline pressure-loss self-closing system. When the gas pipeline loses pressure, a reset spring pushes a sealing film downward, and the sealing film drives a trigger downward. The downward movement of the trigger triggers the closing of a travel switch, so that the normally open solenoid valve is closed, and the gas inlet end of the gas pipeline is closed, and gas leakage will not continue. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 It is a structural schematic diagram of a preferred implementation of the gas pipeline pressure loss self-closing system of the utility model.
[0016] Figure 2 It is a structural diagram of a pressure switch.
[0017] Figure 3 It is a structural diagram of a trigger.
[0018] Figure 4 It is a schematic diagram of the structure of the lower shell.
[0019] Figure 5 It is a structural schematic diagram of the intermediate shell.
[0020] Figure 6 It is a schematic diagram of the structure of the sealing membrane.
[0021] The meanings of the symbols in the accompanying drawings are:
[0022] Gas pipeline 1, normally open solenoid valve 2, pressure switch A, shell 3, closed cavity 301, open cavity 302, lower shell 31, positioning groove 311, intermediate shell 32, main body 321, guide column 322, guide hole 323, upper shell 33, sealing membrane 4, positioning protrusion 41, limiting ring 42, trigger 5, connecting rod 51, limiting part 511, trigger member 52, locking member 53, anti-drop plate 531, reset spring 6, travel switch 7, sealing ring 8. DETAILED DESCRIPTION
[0023] The utility model will be further described below in conjunction with the accompanying drawings.
[0024] like Figure 1 and Figure 2 As shown, the preferred embodiment of the gas pipeline pressure loss self-closing system of the utility model comprises a normally open solenoid valve 2 arranged at the gas inlet end of the gas pipeline 1 and a pressure switch A arranged at the gas outlet end of the gas pipeline 1, wherein the pressure switch A is electrically connected to the normally open solenoid valve 2, and the pressure switch A is used to control the on and off of the normally open solenoid valve 2. When the gas pipeline 1 loses pressure, the pressure switch A is closed, and the normally open solenoid valve 2 is powered on and closed, thereby closing the gas pipeline 1.
[0025] The pressure switch A comprises a housing 3, a sealing membrane 4, a trigger 5, a reset spring 6 and a travel switch 7. The sealing membrane 4 is fixed on the housing 3, and the sealing membrane 4 divides the housing 3 into a closed cavity 301 and an open cavity 302. The lower part of the sealing membrane 4 is the open cavity 302, and the upper part of the sealing membrane 4 is the closed cavity 301; the housing 3 is installed on the gas pipeline 1, and the open cavity 302 is connected to the gas pipeline 1, so that the pressure in the gas pipeline 1 can be transmitted to the sealing membrane 4, and the sealing membrane 4 can move according to the pressure in the gas pipeline 1. The trigger 5, the reset spring 6 and the travel switch 7 are all located in the closed cavity 301, the travel switch 7 is fixed on the shell 3, the travel switch 7 is electrically connected to the normally open solenoid valve 2, the travel switch 7 is used to control the on and off of the normally open solenoid valve 2, when the travel switch 7 is closed, the normally open solenoid valve 2 is energized, and the normally open solenoid valve 2 is closed to disconnect the gas pipeline 1; the trigger 5 is fixed on the sealing membrane 4, the trigger 5 moves with the sealing membrane 4, the trigger 5 is used to touch the travel switch 7, and the travel switch 7 is used to connect and disconnect the normally open solenoid valve 2; the lower end of the reset spring 6 abuts against the sealing membrane 4, the upper end of the reset spring 6 abuts against the shell 3, and the reset spring 6 is used to reset the sealing membrane 4. When the pressure in the gas pipeline 1 is normal, the sealing membrane 4 is pushed upward by the pressure, so that the sealing membrane 4 drives the trigger 5 to move upward, and the reset spring 6 is compressed at the same time; when the pressure in the gas pipeline 1 is depressurized, the sealing membrane 4 is reset under the action of the reset spring 6, thereby driving the trigger 5 to move downward, and the trigger 5 triggers the travel switch 7 to close, so that the normally open solenoid valve 2 is closed and disconnects the gas pipeline 1.
[0026] like Figure 3 As shown, the trigger 5 includes a connecting rod 51 and a trigger member 52, wherein the trigger member 52 is mounted on the connecting rod 51, the reset spring 6 is sleeved on the connecting rod 51, and the connecting rod 51 is fixed on the sealing film 4. Specifically, the connecting rod 51 is fixed to the sealing film 4 by a locking member 53, the locking member 53 is screwed on the connecting rod 51, the locking member 53 has an anti-slip plate 531, and the sealing film 4 is clamped between the anti-slip plate 531 and the connecting rod 51. The top of the connecting rod 51 has a limiting portion 511, and the limiting portion 511 is used to limit the connecting rod 51 to prevent the connecting rod 51 from excessively moving downward. The trigger member 52 is disc-shaped, and in other embodiments, the trigger member 52 can also be a rod. The trigger member 52 is set to be disc-shaped, and relative to the rod, there is no need to consider the installation position of the trigger member 52, and any installation can ensure that the trigger member 52 can trigger the travel switch 7.
[0027] refer to Figure 2 , Figure 4 and Figure 5The housing 3 includes a lower housing 31, an intermediate housing 32 and an upper housing 33. The upper housing 33 is screwed on the intermediate housing 32, and the intermediate housing 32 is bolted on the lower housing 31. The lower housing 31 and the intermediate housing 32 clamp and fix the sealing membrane 4. The intermediate housing 32 is provided with a guide hole 323, and the guide hole 323 is used to guide the trigger 5 to move vertically up and down. The travel switch 7 is fixed on the upper housing 33. The sealing membrane 4 and the lower housing 31 enclose an open cavity 302, and the sealing membrane 4, the intermediate housing 32 and the upper housing 33 enclose a sealed cavity.
[0028] The lower shell 31 is tubular, so that it can be connected to the gas pipeline 1. The outer wall of the lower shell 31 is provided with a thread, and the lower shell 31 is screwed on the gas pipeline 1 for easy disassembly. The lower shell 31 is provided with a positioning groove 311, and the positioning groove 311 is used to position the sealing film 4.
[0029] The intermediate shell 32 includes a main body 321 and a guide column 322 integrated with the main body 321, the guide column 322 is located in the middle of the main body 321, a guide hole 323 is set on the guide column 322, the guide hole 323 passes through the guide column 322 and the main body 321, the connecting rod 51 is located in the guide hole 323, the middle part of the main body 321 protrudes upward, so that the position of the guide column 322 is located in the middle of the connecting rod 51, ensuring that the connecting rod 51 can move up and down stably.
[0030] like Figure 6 As shown, a sealing ring 8 is provided between the upper shell 33 and the intermediate shell 32 to ensure that the gas does not enter the closed chamber 301. A positioning protrusion 41 is provided on the outer edge of the sealing membrane 4, and the positioning protrusion 41 is placed in the positioning groove 311 to facilitate the rapid positioning of the sealing membrane 4. A limiting ring 42 is provided in the middle of the sealing membrane 4, and the limiting ring 42 is used to limit the reset spring 6 to ensure that the lower end of the reset spring 6 does not shake.
[0031] When the pressure of the gas pipeline 1 is normal, the sealing film 4 is pushed upward by the pressure of the gas, so that the trigger 5 is driven by the sealing film 4 to move upward, the trigger 5 is separated from the travel switch 7, the normally open solenoid valve 2 is not energized, and the solenoid valve is always in an open state, allowing gas to be transported in the gas pipeline 1. When the gas pipeline 1 loses pressure, the return spring 6 pushes the sealing film 4 downward, the sealing film 4 drives the trigger 5 downward, and the downward movement of the trigger 5 triggers the travel switch 7 to close, so that the normally open solenoid valve 2 is closed, and the gas inlet end of the gas pipeline 1 is closed so that gas will not continue to leak.
[0032] The above are only implementation methods of the present utility model, and are not intended to limit the patent scope of the present utility model. Any equivalent structure made using the contents of the specification and drawings of the present utility model, directly or indirectly used in other related technical fields, are also within the patent protection scope of the present utility model.
Claims
1. A gas pipeline pressure loss self-closing system, characterized by: It includes a normally open solenoid valve arranged at the air inlet end of the gas pipeline and a pressure switch arranged at the air outlet end of the gas pipeline, the pressure switch is electrically connected to the normally open solenoid valve, and the pressure switch is used to control the on and off of the normally open solenoid valve; the pressure switch includes a shell, a sealing film, a trigger, a reset spring and a travel switch, the sealing film is fixed on the shell to divide the shell into a closed cavity and an open cavity, the shell is installed on the gas pipeline, the open cavity is connected to the gas pipeline, the trigger is fixed on the sealing film, the trigger, the reset spring and the travel switch are all located in the closed cavity, the reset spring is used to reset the sealing film, the trigger is used to touch the travel switch, and the travel switch is used to connect and disconnect the normally open solenoid valve.
2. The gas pipeline pressure loss self-closing system according to claim 1, characterized in that: The trigger comprises a connecting rod and a trigger member, wherein the trigger member is mounted on the connecting rod, the return spring is sleeved on the connecting rod, and the connecting rod is fixed on the sealing film.
3. The gas pipeline pressure loss self-closing system according to claim 2, characterized in that: The triggering member is in the shape of a disc.
4. The gas pipeline pressure loss self-closing system according to claim 2, characterized in that: The connecting rod is fixed to the sealing membrane through a locking piece, the locking piece is screwed on the connecting rod, and the locking piece has an anti-slip plate.
5. The gas pipeline pressure loss self-closing system according to claim 1, characterized in that: The shell includes a lower shell, an intermediate shell and an upper shell, the upper shell is installed on the intermediate shell, the intermediate shell is installed on the lower shell, the lower shell and the intermediate shell clamp and fix the sealing membrane, the intermediate shell is provided with a guide hole, the guide hole is used to guide the trigger to move vertically up and down, the travel switch is fixed on the upper shell, the sealing membrane and the lower shell are enclosed to form an open cavity, and the sealing membrane, the intermediate shell and the upper shell are enclosed to form a sealed cavity.
6. The gas pipeline pressure loss self-closing system according to claim 5, characterized in that: The lower shell is tubular and is provided with a positioning groove for positioning the sealing film.
7. The gas pipeline pressure loss self-closing system according to claim 5, characterized in that: The intermediate shell comprises a body and a guide column integrated with the body, the middle part of the body protrudes upward, the guide column is located in the middle part of the body, a guide hole is arranged on the guide column, and the guide hole passes through the guide column and the body.
8. The gas pipeline pressure loss self-closing system according to claim 5, characterized in that: A sealing ring is arranged between the upper shell and the intermediate shell.
9. The gas pipeline pressure loss self-closing system according to claim 1, characterized in that: The outer edge of the sealing film is provided with a positioning protrusion.
10. The gas pipeline pressure loss self-closing system according to claim 1, characterized in that: A limiting ring is arranged in the middle of the sealing film, and the limiting ring is used for limiting the return spring.