Self-closing valve for automatic closing of gas pipes

Abstract

The application discloses a self-closing valve for automatically closing a gas pipeline, which comprises a valve body, an opening cap arranged at the top of the valve body, an opening knob fixedly connected to the bottom end of the opening cap, an upper cover fixedly connected to the bottom end of the opening knob, a movable rod penetrating through the inside of the opening cap, the movable rod being rotationally connected with the opening cap, and the movable rod penetrating through the inside of the opening knob at one end. The application sets the movable rod at the top of the lock sleeve, sets the movable valve at the bottom end of the lock sleeve, sets the valve core in the connecting groove, sets the sealing ring at one end of the valve core, sets the clamping spring on the outer wall of the movable valve, and sets the diaphragm on one side of the outer wall of the tray, so that the movable valve can slide up and down in the valve body. In the application, a magnet is not needed, so that the magnetism and material of the magnet are not required, the valve transmission structure is simple and convenient, the possibility of failure is reduced, and the function perfection and comprehensive popularization and application of the pipeline self-closing valve are facilitated.

Description

Technical Field

[0001] This invention relates to the field of automatic shut-off valve technology, specifically to an automatic shut-off valve for automatically closing gas pipelines. Background Technology

[0002] A gas pipeline automatic shut-off valve, or simply automatic shut-off valve, is a device installed on low-pressure gas pipelines. It automatically closes without electricity or other external power when the gas supply pressure is insufficient or excessive, and must be manually opened. The automatic shut-off valve installed at the end of the pipeline after the gas meter, where it connects to the hose, should have a pressure-loss shut-off function.

[0003] Traditional self-closing valves, while ensuring stable function, have high requirements for the magnetic force and material of the magnets. The transmission structure is complex, and the assembly and manufacturing costs are relatively high. In addition, the magnets have certain requirements for the installation environment and the surrounding magnetic field. The more assembly parts there are, the more stringent the installation environment requirements become, which increases the possibility of failure and is not conducive to the improvement of the function of pipeline self-closing valves and their widespread application. Summary of the Invention

[0004] The purpose of this invention is to provide a self-closing valve for automatically shutting off gas pipelines, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A self-closing valve for automatically shutting off gas pipelines, comprising a valve body;

[0007] The pipe body is fixedly connected to the outer wall of the valve body body, and the pipe body body is in communication with the valve body body body;

[0008] The connector is fixedly connected to one end of the pipe body;

[0009] A pressure detection port is located on one side of the outer wall of the pipe body;

[0010] The valve body has an opening cap on its top. An opening knob is fixedly connected to the bottom of the opening cap. A top cover is fixedly connected to the bottom of the opening knob. A movable rod passes through the opening cap and is rotatably connected to the opening cap. One end of the movable rod passes through the opening knob and is rotatably connected to it. A locking sleeve is slidably connected to the bottom of the movable rod. A valve is engaged with the bottom of the locking sleeve. A tray is slidably connected to the outer wall of the movable rod. A diaphragm is provided between the tray and the locking sleeve. One side of the outer wall of the diaphragm is fixedly connected to the outer wall of the tray, and the other side is fixedly connected to the locking sleeve. The outer wall of the diaphragm is fixedly connected to the interior of the valve body. The bottom of the diaphragm is fixedly connected to the locking sleeve. The valve is slidably connected to the interior of the valve body. A retaining spring is provided on the outer wall of the valve. The outer wall of the retaining spring is fixedly connected to the interior of the valve body. A connecting groove is provided inside the valve body, and the connecting groove communicates with the pipeline body.

[0011] Furthermore, a valve core is slidably connected inside the connecting groove. One end of the valve core is in contact with the outer wall of the valve. A sealing ring is fixedly connected to the end of the valve core away from the valve. A flow valve body is provided inside the pipe body. A first spring is provided between the flow valve body and the valve core. The addition of the sealing ring allows the connecting groove to be blocked.

[0012] Furthermore, a flow valve cap is slidably connected to the side of the flow valve body away from the first spring, and a flow valve plate is slidably connected inside the flow valve cap. A second spring is provided between the flow valve plate and the flow valve body. The addition of the flow valve body restricts the movement trajectory of the flow valve cap.

[0013] Furthermore, a vent valve knob is fixedly connected to the outer wall of the pipe body, and a ball shaft is fixedly connected to the bottom end of the vent valve knob. The ball shaft is rotatably connected to the pipe body, and a sealing gasket is provided between the ball shaft and the inside of the pipe body. One side of the outer wall of the sealing gasket is fixedly connected to the inside of the pipe body. The addition of the ball shaft can control the gas supply.

[0014] Furthermore, one end of the first spring is fixedly connected to the outer wall of the sealing ring, and the other end of the first spring is fixedly connected to the outer wall of the flow valve body.

[0015] The cross-sectional shape of the valve is set to conical, and the diaphragm is a rubber component. The addition of the valve allows the valve core to slide inside the connecting groove.

[0016] Furthermore, a first groove is formed on the outer wall of the connector away from the pipe body, and the first groove communicates with the pipe body. A second groove is formed inside the connector, and a fixing rod is fixedly connected inside the second groove. A locking rod is slidably connected to the outer wall of the fixing rod. A third spring is provided between the locking rod and the second groove. The addition of the fixing rod restricts the movement trajectory of the locking rod.

[0017] Furthermore, a connecting pipe is slidably connected inside the first groove, and a locking groove is formed on the outer wall of the connecting pipe. One end of the locking rod passes through the first groove and is slidably connected to the connecting head. One end of the locking rod engages with the locking groove, and the addition of the locking groove fixes the position of the connecting pipe.

[0018] Furthermore, a pressing plate is fixedly connected to the outer wall of the locking rod, a pressing rod is hinged to the outer wall of the pressing plate, and a connecting plate is hinged to the end of the pressing rod away from the pressing plate.

[0019] The outer wall of the connector is provided with a third groove, which is connected to the second groove. The addition of the extrusion rod allows the connector to drive the extrusion plate to move.

[0020] Furthermore, a groove is provided on one side of the outer wall of the connecting plate, and a slider is slidably connected inside the groove. A rocker arm is hinged to one side of the outer wall of the slider, and one side of the outer wall of the rocker arm is hinged to the third groove. The addition of the rocker arm allows the slider to slide inside the groove.

[0021] Furthermore, the number of the extrusion rods is set to two, and the two extrusion rods are symmetrically distributed on both sides of the outer wall of the connecting plate. The cross-sectional shape of the third groove is set to be arc-shaped. The addition of the extrusion plate enables the extrusion rods to drive the locking rods to move.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0023] 1. The self-closing valve for automatic shut-off of gas pipelines described in this invention can automatically close the valve body when the gas pressure is too high or too low. It is achieved by setting a movable rod at the top of the locking sleeve, a valve at the bottom of the locking sleeve, a valve core inside the connecting groove, a sealing ring at one end of the valve core, a retaining spring on the outer wall of the valve, and a diaphragm on one side of the outer wall of the tray. This allows the valve to slide up and down inside the valve body. This invention eliminates the need for magnets, thus avoiding requirements on the magnetic force and material of magnets. The valve body's transmission structure is simple and convenient, reducing the possibility of malfunctions and facilitating the improvement and widespread application of the pipeline self-closing valve.

[0024] 2. The self-closing valve for automatic shut-off of gas pipelines described in this invention makes the connection between the connecting pipe and the connector simple and convenient. By setting a slider inside the slide groove, setting a pressing plate at one end of the pressing rod, setting a locking rod at one end of the pressing plate, setting a fixing rod at one end of the locking rod, setting a third spring between the locking rod and the second groove, setting a handle inside the third groove, and setting a locking groove on the outer wall of the connecting pipe, the locking rod can return to the initial position. In this invention, when it is necessary to disassemble and replace the connecting pipe, the swing rod can be pulled. Attached Figure Description

[0025] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0026] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0027] Figure 2 This is a front sectional view of the valve body of the present invention.

[0028] Figure 3 This is a schematic diagram of the internal structure of the valve body of the present invention;

[0029] Figure 4 This is a schematic diagram of the overall structure of the lock sleeve of the present invention;

[0030] Figure 5 This is a schematic diagram of the overall structure of the ball shaft of the present invention;

[0031] Figure 6 This is a schematic diagram of the overall structure of the valve core of the present invention;

[0032] Figure 7 This is a side sectional view of the second groove of the present invention.

[0033] In the diagram: 1 Valve body; 2 Pipe body; 3 Connector; 4 Pressure detection port; 5 Opening cap; 6 Opening knob; 7 Top cover; 8 Movable rod; 9 Locking sleeve; 10 Live valve; 11 Tray; 12 Diaphragm; 13 Snap ring; 14 Connecting groove; 15 Valve core; 16 Sealing ring; 17 Flow valve body; 18 First spring; 19 Flow valve cap; 20 Flow valve plate; 21 Second spring; 22 Vent valve knob; 23 Ball shaft; 24 Sealing gasket; 25 First groove; 26 Second groove; 27 Fixing rod; 28 Engaging rod; 29 Third spring; 30 Connecting pipe; 31 Engaging groove; 32 Extrusion plate; 33 Extrusion rod; 34 Connecting plate; 35 Third groove; 36 Slide groove; 37 Slider; 38 Rocker arm. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] Please see Figures 1-7 The present invention provides the following technical solution:

[0036] A self-closing valve for automatically shutting off a gas pipeline includes a valve body 1;

[0037] Pipe body 2 is fixedly connected to the outer wall of valve body 1, and pipe body 2 is connected to valve body 1;

[0038] Connector 3 is fixedly connected to one end of pipe body 2;

[0039] Pressure detection port 4 is located on one side of the outer wall of the pipe body 2;

[0040] The valve body 1 has an opening cap 5 on its top. An opening knob 6 is fixedly connected to the bottom of the opening cap 5. A top cover 7 is fixedly connected to the bottom of the opening knob 6. A movable rod 8 passes through the inside of the opening cap 5 and is rotatably connected to the opening cap 5. One end of the movable rod 8 passes through the inside of the opening knob 6 and is rotatably connected to the opening knob 6. A locking sleeve 9 is slidably connected to the bottom of the movable rod 8. A valve 10 is engaged at the bottom of the locking sleeve 9. A tray 11 is slidably connected to the outer wall of the movable rod 8. The tray 11 is engaged with the locking sleeve. A diaphragm 12 is provided between 9. One side of the outer wall of the diaphragm 12 is fixedly connected to the outer wall of the tray 11, and the other side of the outer wall of the diaphragm 12 is fixedly connected to the locking sleeve 9. The outer wall of the diaphragm 12 is fixedly connected to the inside of the valve body 1. The bottom end of the diaphragm 12 is fixedly connected to the locking sleeve 9. The valve 10 is slidably connected to the inside of the valve body 1. A retaining ring 13 is provided on the outer wall of the valve 10. The outer wall of the retaining ring 13 is fixedly connected to the inside of the valve body 1. A connecting groove 14 is opened inside the valve body 1. The connecting groove 14 is connected to the pipe body 2.

[0041] In a preferred embodiment, a valve core 15 is slidably connected inside the connecting groove 14. One end of the valve core 15 is in contact with the outer wall of the valve 10, and a sealing ring 16 is fixedly connected to the end of the valve core 15 away from the valve 10. A flow valve body 17 is provided inside the pipe body 2. A first spring 18 is provided between the flow valve body 17 and the valve core 15. When the valve core 15 moves, the valve core 15 will squeeze the first spring 18.

[0042] In a preferred embodiment, a flow valve cap 19 is slidably connected to the side of the flow valve body 17 away from the first spring 18. A flow valve plate 20 is slidably connected inside the flow valve cap 19. A second spring 21 is provided between the flow valve plate 20 and the flow valve body 17. When the flow valve body 17 slides inside the pipe body 2, the flow valve body 17 will slide with the flow valve cap 19.

[0043] In a preferred embodiment, a vent valve knob 22 is fixedly connected to the outer wall of the pipe body 2, and a ball shaft 23 is fixedly connected to the bottom end of the vent valve knob 22. The ball shaft 23 is rotatably connected to the pipe body 2, and a sealing gasket 24 is provided between the ball shaft 23 and the inside of the pipe body 2. One side of the outer wall of the sealing gasket 24 is fixedly connected to the inside of the pipe body 2. When the vent valve knob 22 is rotated, the vent valve knob 22 will drive the ball shaft 23 to move.

[0044] In a preferred embodiment, one end of the first spring 18 is fixedly connected to the outer wall of the sealing ring 16, and the other end of the first spring 18 is fixedly connected to the outer wall of the flow valve body 17.

[0045] The cross-sectional shape of the valve 10 is set to a cone shape, and the diaphragm 12 is a rubber component. When the valve core 15 squeezes the valve 10, the valve 10 will move downward.

[0046] The working principle of this invention is as follows: When using this self-closing valve, after the connection of connector 3 and connecting pipe 30 is completed, gas enters the first groove 25 from the connecting pipe 30. Rotating the vent valve knob 22 causes the vent valve knob 22 to drive the ball shaft 23, causing the ball shaft 23 to separate from the sealing gasket 24. This allows gas to enter the pipe body 2 from the first groove 25, then from the pipe body 2 into the valve body 1, then through the connecting groove 14, and finally out of the pipe body 2. When the gas pressure inside the valve body 1 is less than a predetermined minimum value, the valve body 1... The valve body 1 is under negative pressure. The internal pressure is less than the combined tension of the first spring 18 and the second spring 21. This causes the first spring 18 to compress the sealing ring 16, which in turn causes the sealing ring 16 to move the valve core 15. The valve core 15 then slides against the connecting groove 14. Simultaneously, the valve core 15 compresses the valve 10. The valve 10 has a frustum-shaped cross-section, allowing the valve core 15 to move it. The valve 10 then moves the locking sleeve 9, causing it to slide up and down inside the valve body 1. The locking sleeve 9 also slides against the movable rod 8, and the locking sleeve 9 moves the diaphragm 12. The movement causes the diaphragm 12 to move towards the valve 10, resulting in the diaphragm 12 collapsing towards the valve 10. Simultaneously, the diaphragm 12 moves the tray 11, causing it to slide inside the valve body 1. The valve core 15 then moves the sealing ring 16, blocking the connecting groove 14 and preventing gas from flowing out. When the internal pressure of the valve body 1 exceeds the rated value, the valve body 1 is in an overpressure state. The gas inside the valve body 1 then compresses the diaphragm 12, causing it to move the locking sleeve 9, which then slides against the outer wall of the movable rod 8. The valve 10 moves while the locking sleeve 9 moves, causing the valve 10 to slide up and down inside the valve body 1. When the valve 10 moves to the side of the retaining spring 13, the retaining spring 13 prevents the valve 10 from moving upward, while the diaphragm 12 continues to move the locking sleeve 9, causing the movable rod 8 inside the locking sleeve 9 to squeeze the valve 10, causing the locking sleeve 9 to separate from the valve 10. At this time, the valve 10 loses the pulling force of the locking sleeve 9. When it is squeezed by the valve core 15 at the same time, the valve 10 will move downward. At the same time, the valve core 15 drives the sealing ring 16 to move, causing the sealing ring 16 to block the connecting groove 14.

[0047] Please see Figures 1-7The present invention provides a technical solution: a self-closing valve for automatic shut-off of gas pipelines. A first groove 25 is provided on the outer wall of the connector 3 away from the pipeline body 2. The first groove 25 is connected to the pipeline body 2. A second groove 26 is provided inside the connector 3. A fixing rod 27 is fixedly connected inside the second groove 26. A locking rod 28 is slidably connected to the outer wall of the fixing rod 27. A third spring 29 is provided between the locking rod 28 and the second groove 26. When the locking rod 28 slides on the outer wall of the fixing rod 27, the locking rod 28 will simultaneously drive the pressing plate 32 to move.

[0048] In a preferred embodiment, a connecting tube 30 is slidably connected inside the first groove 25. The outer wall of the connecting tube 30 is provided with a locking groove 31. One end of the locking rod 28 passes through the inside of the first groove 25 and is slidably connected to the connector 3. One end of the locking rod 28 is engaged with the locking groove 31. When one end of the locking rod 28 is separated from the locking groove 31, the connecting tube 30 can slide inside the first groove 25.

[0049] In a preferred embodiment, a pressing plate 32 is fixedly connected to the outer wall of the locking rod 28, a pressing rod 33 is hinged to the outer wall of the pressing plate 32, and a connecting plate 34 is hinged to the end of the pressing rod 33 away from the pressing plate 32.

[0050] The outer wall of the connector 3 is provided with a third groove 35, which is connected to the second groove 26. When the connecting plate 34 slides inside the second groove 26, the connecting plate 34 will squeeze the extrusion rod 33.

[0051] In a preferred embodiment, a groove 36 is provided on one side of the outer wall of the connecting plate 34, and a slider 37 is slidably connected inside the groove 36. A rocker arm 38 is hinged to one side of the outer wall of the slider 37, and one side of the outer wall of the rocker arm 38 is hinged to the third groove 35. When the rocker arm 38 drives the slider 37 to move, the slider 37 will slide inside the groove 36.

[0052] In a preferred embodiment, the number of extrusion rods 33 is set to two, and the two extrusion rods 33 are symmetrically distributed on both sides of the outer wall of the connecting plate 34. The cross-sectional shape of the third groove 35 is set to be arc-shaped. When the extrusion rods 33 swing, the extrusion rods 33 drive the extrusion plate 32 to move.

[0053] The working principle of this invention is as follows: When using this device, if it is necessary to connect or disconnect the connector 3 and the connecting pipe 30, pull the swing rod 38 to make it swing inside the third groove 35. Simultaneously, the swing rod 38 drives the slider 37 to move, causing the slider 37 to slide inside the groove 36. At the same time, the swing rod 38 swings inside the second groove 26. Simultaneously, the swing rod 38, through the slider 37, presses the connecting plate 34, causing the connecting plate 34 to slide inside the second groove 26. The connecting plate 34 simultaneously drives the pressing rod 33 to move, causing the pressing rod 33 to swing inside the second groove 26. The pressing rod 33 also presses the pressing plate 32, causing the pressing plate 32 to slide inside the second groove 26. The pressing plate 32 then drives the locking rod 28 to move, causing the locking rod 28 to slide inside the second groove 26. Simultaneously, the locking rod 28 slides on the outer wall of the fixing rod 27. When the third spring 29 is pressed, one end of the locking rod 28 will gradually separate from the locking groove 31. When one end of the locking rod 28 is completely separated from the locking groove 31, the connecting tube 30 is pulled to disengage from the first groove 25. When the replacement of the connecting tube 30 is completed, the connecting tube 30 is returned to the first groove 25. The swing rod 38 is released, and under the squeezing force of the third spring 29, the locking rod 28 slides on the outer wall of the fixed rod 27. At the same time, the locking rod 28 drives the squeezing plate 32 to move, so that the squeezing plate 32 squeezes the squeezing rod 33, causing the squeezing rod 33 to swing inside the second groove 26. At the same time, the squeezing rod 33 drives the connecting plate 34 to move, so that the connecting plate 34 slides inside the second groove 26. The connecting plate 34 also drives the slider 37 to move, so that the slider 37 drives the swing rod 38 to move, causing the swing rod 38 to swing. At this time, one end of the locking rod 28 re-engages with the locking groove 31.

[0054] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A self-closing valve for automatically closing a gas pipeline, comprising a valve body (1); a pipeline body (2) fixedly connected to the outer wall of the valve body (1), and the pipeline body (2) communicating with the valve body (1); a connector (3) fixedly connected to one end of the pipeline body (2); and a pressure detection port (4) opened on one side of the outer wall of the pipeline body (2); characterized in that: The valve body (1) top is equipped with the opening cap (5), the opening cap (5) bottom fixedly connected with the opening pull button (6), the opening pull button (6) bottom fixedly connected with the upper cover (7), the opening cap (5) inside is penetrated with the movable rod (8), the movable rod (8) is rotatably connected with the opening cap (5), the movable rod (8) one end is penetrated in the opening pull button (6) inside, the movable rod (8) is rotatably connected with the opening pull button (6), the movable rod (8) bottom slidingly connected with the lock sleeve (9), the lock sleeve (9) bottom is engagedly connected with the valve (10), the movable rod (8) outer wall slidingly connected with the tray (11), the tray (11) and the lock sleeve (9) between the diaphragm (12) is equipped with, the diaphragm (12) outer wall one side and the tray (11) outer wall fixedly connected, the diaphragm (12) outer wall other side and the lock sleeve (9) fixedly connected, the diaphragm (12) outer wall and the valve body (1) inside fixedly connected, the diaphragm (12) bottom and the lock sleeve (9) fixedly connected, the valve (10) and the valve body (1) inside slidingly connected, the valve (10) outer wall is equipped with the circlip (13), the circlip (13) outer wall and the valve body (1) inside fixedly connected, the valve body (1) inside is equipped with the connecting groove (14), the connecting groove (14) and the pipeline body (2) are communicated; The connecting groove (14) inside slidingly connected with the valve core (15), the valve core (15) one end and the valve (10) outer wall are fitted, the valve core (15) is fixedly connected with the sealing ring (16) away from the valve (10) one end, the pipeline body (2) inside is equipped with the flow valve body (17), the flow valve body (17) and the valve core (15) between the first spring (18) is equipped with; The pipeline body (2) outer wall fixedly connected with the breather valve knob (22), the breather valve knob (22) bottom fixedly connected with the ball shaft (23), the ball shaft (23) and the pipeline body (2) rotatably connected, the ball shaft (23) and the pipeline body (2) between the sealing pad (24) is equipped with, the sealing pad (24) outer wall one side and the pipeline body (2) inside fixedly connected.

2. A self-closing valve for automatic closure of a gas pipe according to claim 1, characterized in that: The flow valve body (17) away from the first spring (18) side slidingly connected with the flow valve cap (19), the flow valve cap (19) inside slidingly connected with the flow valve piece (20), the flow valve piece (20) and the flow valve body (17) between the second spring (21) is equipped with.

3. A self-closing valve for automatic closure of a gas pipe according to claim 1, characterized in that: The first spring (18) one end and the sealing ring (16) outer wall fixedly connected, the first spring (18) other end and the flow valve body (17) outer wall fixedly connected;The cross-sectional shape of the valve (10) is set as conical, the diaphragm (12) is rubber material member.

4. A self-closing valve for automatic closure of a gas pipe according to claim 1, characterized in that: The outer wall of the connecting head (3) is provided with a first recess (25) away from the pipeline body (2), the first recess (25) is communicated with the pipeline body (2), the connecting head (3) is internally provided with a second recess (26), the second recess (26) is fixedly connected with a fixed rod (27) inside, the outer wall of the fixed rod (27) is slidably connected with a clamping rod (28), and the third spring (29) is arranged between the clamping rod (28) and the second recess (26).

5. A self-closing valve for automatic closure of a gas pipe according to claim 4, characterized in that: The first recess (25) is slidably connected with a connecting pipe (30) inside, the outer wall of the connecting pipe (30) is provided with a clamping groove (31), one end of the clamping rod (28) penetrates into the first recess (25), the clamping rod (28) is slidably connected with the connecting head (3), and one end of the clamping rod (28) is clamped with the clamping groove (31).

6. A self-closing valve for automatic closure of a gas pipe according to claim 4, characterized in that: The outer wall of the clamping rod (28) is fixedly connected with an extrusion plate (32), the outer wall of the extrusion plate (32) is hingedly connected with an extrusion rod (33), and one end of the extrusion rod (33) away from the extrusion plate (32) is hingedly connected with a connecting plate (34). The outer wall of the connecting head (3) is provided with a third recess (35), and the third recess (35) is communicated with the second recess (26).

7. A self-closing valve for automatic closure of a gas pipe according to claim 6, characterized in that: The outer wall of the connecting plate (34) is provided with a sliding groove (36) on one side, the sliding groove (36) is slidably connected with a sliding block (37) inside, the outer wall of the sliding block (37) is hingedly connected with a swing rod (38) on one side, and the outer wall of the swing rod (38) is hingedly connected with the third recess (35) on one side.

8. A self-closing valve for automatic closure of a gas pipe according to claim 6, characterized in that: The number of the extrusion rods (33) is two, and the two extrusion rods (33) are symmetrically distributed on the outer wall of the connecting plate (34), and the cross-sectional shape of the third recess (35) is arc-shaped.

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