A multifunctional pipeline gas self-closing valve

Abstract

The present invention discloses a multifunctional pipeline gas self-closing valve, including an air inlet bin, an inner wall on one side of the air inlet bin is provided with an internal thread, a pressure chamber is fixedly connected to one side of the air inlet bin, and a closing chamber is fixedly connected to the side of the pressure chamber away from the air inlet bin. When the present invention is in use, the pressure measuring on-off mechanism inside the pressure chamber detects the air pressure of the circulating gas, and is turned on when overpressure occurs, and the gas is diverted to the piston cylinder through the L-shaped pipe, the strong pressure inside the piston cylinder increases, the piston head moves toward the exhaust bin, and the first sealing plug is pushed toward the exhaust bin through the piston rod, the circulation path between the closing chamber and the exhaust bin is closed, and the overpressure gas is prevented from flowing to the user end, avoiding safety accidents. The processes of pressure detection and gas blocking are completed in the closed interval, and the leakage of overpressure gas is prevented to the greatest extent possible, and no electronic components are required to participate in the control, and there is no possibility of fire caused by circuit failure.

Description

Technical Field

[0001] The invention relates to the technical field of gas valves, and in particular to a multifunctional pipeline gas self-closing valve. Background Art

[0002] The self-closing valve is installed on the pipeline of the low-pressure gas system. When the pipeline gas supply pressure is under-pressure or over-pressure, it can automatically close without electricity or other external power and must be opened manually. The self-closing valve installed at the end of the pipeline behind the gas meter and the connection with the hose should have the function of closing when the pressure is lost.

[0003] Existing gas self-closing valves are all equipped with external control components, which are required to participate in the working process of the self-closing valve. The self-closing valve cannot complete the overpressure isolation of the gas through its own components, which leads to the need to open at least one hole in the valve shell that is connected to the outside world, increasing the difficulty of sealing the valve shell and increasing the risk of gas leakage. It is urgent to design a multifunctional pipeline gas self-closing valve to solve the above problems. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a multifunctional pipeline gas self-closing valve.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A multifunctional pipeline gas self-closing valve comprises an air inlet bin, an inner wall of one side of the air inlet bin is provided with an internal thread, one side of the air inlet bin is fixedly connected to a pressure chamber, and the side of the pressure chamber away from the air inlet bin is fixedly connected to a closing chamber, the side of the closing chamber away from the pressure chamber is fixedly connected to an exhaust bin, the inner wall of the top of the pressure chamber is fixedly connected to a piston cylinder, and the inside of the piston cylinder is slidably connected to a piston head, the middle part of the piston head away from the air inlet bin is fixedly connected to a piston rod, and the end of the piston rod away from the piston head is fixedly connected to a first sealing plug, the outer diameter of the first sealing plug is larger than the inner diameter of the connection between the exhaust bin and the closing chamber, an L-shaped tube is inserted on one side of the bottom of the piston cylinder, and the opening of the bottom end of the L-shaped tube faces the air inlet bin, and the bottom of the L-shaped tube is fixedly connected to a pressure measuring on-off mechanism.

[0007] Preferably, the pressure measuring on-off mechanism includes a pressure measuring bucket, a sealing plate, a second sealing plug, a pressure measuring spring, a sleeve, a push plate, a guide rod and a cantilever, and the pressure measuring bucket is inserted into the bottom end of the L-shaped tube, the sealing plate is fixedly connected to the inner wall circumference of the pressure measuring bucket close to the air inlet chamber, a stepped hole is opened in the middle of the sealing plate, the cantilever is fixedly connected to the inner wall of the top of the pressure measuring bucket, the guide rod is fixedly connected to one side of the bottom of the cantilever, the push plate is fixedly connected to the end of the guide rod away from the cantilever, the sleeve is slidably connected to the push plate, the pressure measuring spring is fixedly connected between the side of the push plate and the inner wall of the sleeve, and the second sealing plug is fixedly connected to the outer wall of the sleeve away from the guide rod.

[0008] Preferably, the stepped hole is configured as two annular holes which are interconnected and have different inner diameters, and the inner diameter of the stepped hole on one side close to the second sealing plug is equal to the outer diameter of the second sealing plug, the inner diameter on the other side of the stepped hole is smaller than the outer diameter of the second sealing plug, and the side of the second sealing plug away from the sleeve is configured as an arc surface.

[0009] Preferably, an exhaust port is provided on a side of the closed cavity close to the exhaust bin, and a plunger is fixedly connected to a side of the first sealing plug close to the exhaust port, and an outer diameter of the plunger is adapted to an inner diameter of the exhaust port.

[0010] Preferably, two permanent magnets are symmetrically embedded on one side of the first sealing plug close to the pressure chamber, and two positioning columns are symmetrically fixed on one side of the pressure chamber close to the closing chamber. The two positioning columns are respectively attached to the two permanent magnets, and the positioning columns are made of steel material.

[0011] Preferably, an airbag is fixedly connected to the inner wall of the top of the piston cylinder, and the interior of the airbag is filled with nitrogen, and the airbag is located just above the top end of the L-shaped tube.

[0012] Preferably, the inner wall at the top of the piston cylinder is fixedly connected to a limiting block, and two sliding blocks are symmetrically fixed to the bottom of the limiting block, a limiting groove is opened on the top of the piston rod, and sliding grooves are opened on the inner walls on both sides of the limiting groove, the bottom of the limiting block is slidably connected to the inside of the limiting groove, and the two sliding blocks are slidably connected to the inside of the two sliding grooves respectively.

[0013] Preferably, an annular groove is provided on the middle outer wall of the piston head, and a sealing ring is clamped on the middle circumference of the piston head through the annular groove, and the outer diameter of the sealing ring is adapted to the inner diameter of the piston cylinder.

[0014] Preferably, a drainage block is fixedly connected to the inner wall at the top of the pressure chamber, and the outer wall on one side of the piston cylinder is fixedly connected to the drainage block, and the side of the drainage block close to the air inlet bin is set as an inclined surface.

[0015] Preferably, the inner wall of the bottom of the pressure chamber is fixedly connected to a support platform, and the top of the support platform is tiltedly fixed with a first sleeve, the bottom outer wall of the pressure measuring bucket is fixedly connected to a second sleeve, the second sleeve and the first sleeve are rotatably connected to a rotating rod via a pin, the top of one side of the first sleeve is fixedly connected to a first connecting ring, the top of the rotating rod is fixedly connected to a second connecting ring, and the first connecting ring and the second connecting ring are fixedly connected to a same elastic rope.

[0016] Compared with the prior art, the present invention provides a multifunctional pipeline gas self-closing valve, which has the following beneficial effects:

[0017] 1. By setting up a pressure measuring on-off mechanism, the pressure measuring on-off mechanism inside the pressure chamber detects the gas pressure of the circulating gas, and is turned on when overpressure occurs. The gas is then diverted to the piston cylinder through the L-shaped pipe. The strong pressure in the piston cylinder increases, and the piston head moves toward the exhaust chamber. The first sealing plug is pushed toward the exhaust chamber through the piston rod to close the flow path between the closed chamber and the exhaust chamber, preventing overpressure gas from flowing to the user end and causing safety accidents. The pressure detection and gas blocking processes are completed in the closed area, which can prevent overpressure gas leakage as much as possible. No electronic components are required to participate in the control, and there is no possibility of fire caused by circuit failure.

[0018] 2. By setting a stepped hole, the two-stage design of the stepped hole increases the contact area of ​​the second sealing plug, optimizes the sealing effect of the second sealing plug and the sealing sheet on the pressure measuring bucket, and the arc surface of the second sealing plug increases the contact area with the gas, which can be pushed more easily in the overpressure stage.

[0019] 3. By setting a permanent magnet and a positioning column, the permanent magnet and the positioning column are attracted to each other to assist in the positioning of the first sealing plug, prevent the gas flow from directly affecting the movement of the first sealing plug, and avoid the exhaust chamber being isolated when the gas pressure is below the rated value, thereby reducing unnecessary operation of internal components of the device and optimizing accuracy.

[0020] 4. By setting up the airbag, the diverted gas enters the piston cylinder through the L-shaped tube. The airbag occupies the volume of the piston cylinder, reducing the amount of gas required to start the piston cylinder. Only the top outer wall of the airbag is connected to the inner wall of the piston cylinder. Therefore, it can produce lateral deformation after being subjected to pressure. The auxiliary gas pushes the piston head to move. Before installation, the airbag uses nitrogen to exhaust the air inside itself to prevent the gas from contacting the oxidant and eliminate the fire factor.

[0021] 5. By setting a slider, a slide groove and a limit block, the stroke of the limit block is limited by two slide grooves and a slider to ensure stable movement of the piston rod and ensure that the first sealing plug effectively closes the opening of the closed cavity.

[0022] 6. By setting the first sleeve, the second sleeve, the rotating rod and the elastic rope, the pressure measuring bucket tends to move away from the air inlet chamber after being subjected to the air flow pressure, and there is a possibility of causing the L-shaped tube to deform. At this time, the second sleeve can drive one end of the rotating rod to rotate, and the rotating rod and the first sleeve jointly stretch the elastic rope to buffer the pressure on the pressure measuring bucket and prevent the L-shaped tube from deforming and affecting the air tightness of the piston cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a structural cross-sectional view of a multifunctional pipeline gas self-closing valve proposed by the present invention;

[0024] Figure 2This is a structural schematic diagram of a multifunctional pipeline gas self-closing valve proposed by the present invention;

[0025] Figure 3 This is a schematic diagram of the structure of position A of a multifunctional pipeline gas self-closing valve proposed by the present invention;

[0026] Figure 4 This is a schematic diagram of the structure of position B of a multifunctional pipeline gas self-closing valve proposed by the present invention;

[0027] Figure 5 This is a schematic diagram of the piston rod structure of a multifunctional pipeline gas self-closing valve proposed by the present invention;

[0028] Figure 6 This is a schematic diagram of the structure at position C of a multifunctional pipeline gas self-closing valve proposed by the present invention.

[0029] In the figure: 1-pressure chamber, 2-air inlet chamber, 3-internal thread, 4-sealing sheet, 5-pressure measuring bucket, 6-L-shaped tube, 7-drainage block, 8-air bag, 9-piston cylinder, 11-closing chamber, 12-positioning column, 13-permanent magnet, 14-exhaust chamber, 15-exhaust port, 16-plunger, 17-first sealing plug, 18-step hole, 19-second sealing plug, 20-pressure measuring spring, 21-sleeve, 22-push plate, 23-guide rod, 24-cantilever, 25-support platform, 26-first sleeve, 27-first connecting ring, 28-elastic rope, 29-second connecting ring, 30-second sleeve, 31-rotating rod, 32-piston rod, 33-piston head, 34-sealing ring, 35-limiting block, 36-slider, 37-slide groove, 38-limiting groove. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0031] In the description of this patent, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense, for example, it can be fixedly connected or set, or it can be detachably connected or set, or connected or set in one piece. For ordinary technicians in this field, the specific meanings of the above terms in this patent can be understood according to specific circumstances.

[0032] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0033] Reference Figure 1-6 A multifunctional pipeline gas self-closing valve comprises an air inlet bin 2, an inner wall of one side of the air inlet bin 2 is provided with an internal thread 3, a pressure chamber 1 is fixedly connected to one side of the air inlet bin 2, and a closing chamber 11 is fixedly connected to the side of the pressure chamber 1 away from the air inlet bin 2, an exhaust bin 14 is fixedly connected to the side of the closing chamber 11 away from the pressure chamber 1, a piston cylinder 9 is fixedly connected to the inner wall of the top of the pressure chamber 1, and a piston head 33 is slidably connected to the inside of the piston cylinder 9, a piston rod 32 is fixedly connected to the middle of the side of the piston head 33 away from the air inlet bin 2, and a first sealing plug 17 is fixedly connected to one end of the piston rod 32 away from the piston head 33, and the outer diameter of the first sealing plug 17 is larger than that of the exhaust bin 14 and the closing chamber 11, an L-shaped tube 6 is inserted on one side of the bottom of the piston cylinder 9, and the opening of the bottom end of the L-shaped tube 6 faces the side of the air inlet chamber 2, and a pressure measuring on-off mechanism is fixedly connected to the bottom of the L-shaped tube 6. The air inlet chamber 2 is connected to the gas supply pipeline through the internal thread 3, and the exhaust chamber 14 is connected to the user end of the gas. The pressure measuring on-off mechanism inside the pressure chamber 1 detects the gas pressure of the circulating gas, and is turned on when overpressure occurs. The gas is then diverted to the piston cylinder 9 through the L-shaped tube 6. The strong pressure in the piston cylinder 9 increases, the piston head 33 moves toward the exhaust chamber 14, and the first sealing plug 17 is pushed toward the exhaust chamber 14 through the piston rod 32, thereby closing the flow path between the closed chamber 11 and the exhaust chamber 14.

[0034] In the present invention, the pressure measuring on-off mechanism includes a pressure measuring bucket 5, a sealing plate 4, a second sealing plug 19, a pressure measuring spring 20, a sleeve 21, a push plate 22, a guide rod 23 and a cantilever 24, and the pressure measuring bucket 5 is inserted into the bottom end of the L-shaped tube 6, the sealing plate 4 is fixedly connected to the inner wall circumference of the pressure measuring bucket 5 close to the air intake chamber 2, a stepped hole 18 is opened in the middle of the sealing plate 4, the cantilever 24 is fixedly connected to the inner wall of the top of the pressure measuring bucket 5, the guide rod 23 is fixedly connected to one side of the bottom of the cantilever 24, the push plate 22 is fixedly connected to the end of the guide rod 23 away from the cantilever 24, the sleeve 21 is slidably connected to the push plate 22, the pressure measuring spring 20 is fixedly connected between the side of the push plate 22 and the inner wall of the sleeve 21, and the second sealing plug 19 is fixedly connected to the outer wall of the sleeve 21 away from the guide rod 23.

[0035] Among them, the stepped hole 18 is set as two annular holes which are interconnected and have different inner diameters, and the inner diameter of the stepped hole 18 close to the second sealing plug 19 is equal to the outer diameter of the second sealing plug 19, and the inner diameter of the other side of the stepped hole 18 is smaller than the outer diameter of the second sealing plug 19. The side of the second sealing plug 19 away from the sleeve 21 is set as an arc surface. The two-section design of the stepped hole 18 increases the contact area of ​​the second sealing plug 19 and optimizes the sealing effect of the second sealing plug 19 and the sealing sheet 4 on the pressure measuring bucket. The arc surface of the second sealing plug 19 increases the contact area with the gas, and can be pushed more easily in the overpressure stage.

[0036] Among them, an exhaust port 15 is opened on the side of the closed cavity 11 close to the exhaust bin 14, and a plunger 16 is fixedly connected to the side of the first sealing plug 17 close to the exhaust port 15. The outer diameter of the plunger 16 is adapted to the inner diameter of the exhaust port 15. When the first sealing plug 17 separates the exhaust bin 14, the plunger 16 is driven to be inserted into the exhaust port 15, thereby further strengthening the sealing effect between the exhaust bin 14 and the closed cavity 11.

[0037] Among them, two permanent magnets 13 are symmetrically embedded on one side of the first sealing plug 17 close to the pressure chamber 1, and two positioning columns 12 are symmetrically fixed on one side of the pressure chamber 1 close to the closed chamber 11. The two positioning columns 12 are respectively attached to the two permanent magnets 13, and the positioning columns 12 are made of steel material. The permanent magnets 13 and the positioning columns 12 are adsorbed on each other to assist the positioning of the first sealing plug 17, prevent the gas flow from directly affecting the movement of the first sealing plug 17, and avoid the first sealing plug 17 causing the exhaust chamber 14 to be isolated when the gas pressure is below the rated value, thereby reducing unnecessary operation of internal components of the device and optimizing accuracy.

[0038] Among them, the inner wall of the top of the piston cylinder 9 is fixedly connected with an airbag 8, and the interior of the airbag 8 is filled with nitrogen. The airbag 8 is located directly above the top end of the L-shaped tube 6. The diverted gas enters the piston cylinder 9 through the L-shaped tube 6. The airbag 8 occupies the volume of the piston cylinder 9, reducing the amount of gas required for starting the piston cylinder 9. Only the top outer wall of the airbag 8 is connected to the inner wall of the piston cylinder 9, so it can produce lateral deformation after being subjected to pressure, and the auxiliary gas pushes the piston head 33 to move. Before installation, the airbag 8 uses nitrogen to exhaust the air inside itself to prevent the gas from contacting the oxidant and eliminate the fire factor.

[0039] Among them, the inner wall at the top of the piston cylinder 9 is fixedly connected to the limit block 35, and two sliding blocks 36 are symmetrically fixed to the bottom of the limit block 35. A limit groove 38 is opened on the top of the piston rod 32, and sliding grooves 37 are opened on the inner walls on both sides of the limit groove 38. The bottom of the limit block 35 is slidably connected to the inside of the limit groove 38, and the two sliding blocks 36 are respectively slidably connected to the inside of the two sliding grooves 37. The stroke of the limit block 35 is limited by the two sliding grooves 37 and the sliding blocks 36 to ensure the stable movement of the piston rod 32 and ensure that the first sealing plug 17 effectively closes the opening of the closed cavity 11.

[0040] Among them, an annular groove is opened on the middle outer wall of the piston head 33, and a sealing ring 34 is clamped on the middle circumference of the piston head 33 through the annular groove. The outer diameter of the sealing ring 34 is adapted to the inner diameter of the piston cylinder 9, and the sealing effect of the piston head 33 is optimized by the sealing ring 34.

[0041] Among them, the inner wall at the top of the pressure chamber 1 is fixedly connected with a drainage block 7, and the outer wall on one side of the piston cylinder 9 is fixedly connected to the drainage block 7. The side of the drainage block 7 close to the air intake bin 2 is set as an inclined surface. The piston cylinder 9 is fixed in the pressure chamber 1 through the drainage block 7. The inclined surface on the side of the drainage block 7 guides the airflow to prevent the gas flow from being blocked and causing backflow.

[0042] Among them, the inner wall of the bottom of the pressure chamber 1 is fixedly connected with a support platform 25, and the top of the support platform 25 is tiltedly fixed with a first sleeve 26, the bottom outer wall of the pressure measuring bucket 5 is fixedly connected with a second sleeve 30, and the second sleeve 30 and the first sleeve 26 are rotatably connected with a same rotating rod 31 through a pin shaft, the top of one side of the first sleeve 26 is fixedly connected with a first connecting ring 27, the top of the rotating rod 31 is fixedly connected with a second connecting ring 29, and the first connecting ring 27 and the second connecting ring 29 are fixedly connected with a same elastic rope 28. After the pressure measuring bucket 5 is subjected to the air flow pressure, it tends to move away from the air inlet chamber 2, and there is a possibility of causing the L-shaped tube 6 to deform. At this time, the second sleeve 30 can drive one end of the rotating rod 31 to rotate, and the rotating rod 31 and the first sleeve 26 jointly stretch the elastic rope 28, so as to buffer the pressure on the pressure measuring bucket 5 and prevent the L-shaped tube 6 from deforming and affecting the air tightness of the piston cylinder 9.

[0043] Working principle: when the gas pressure is below the rated value, the second sealing plug 19 is stuck in the stepped hole 18, and cooperates with the sealing plate 4 to close the entrance of the pressure measuring bucket 5, and the pressure at both ends of the pressure measuring spring 20 is balanced. When the gas pressure exceeds the rated value, the pressure on the side of the pressure measuring spring 20 close to the second sealing plug 19 increases and contracts, and the second sealing plug 19 leaves the stepped hole 18 of the sealing plate 4, and the pressure measuring bucket 5 is turned on. During the displacement of the second sealing plug 19, the push plate 22 slides along the inner wall of the sleeve 21, limiting the displacement path of the second sealing plug 19 to prevent deviation.

[0044] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A multifunctional pipeline gas self-closing valve, comprising an air inlet bin (2), wherein an inner wall of one side of the air inlet bin (2) is provided with an internal thread (3), characterized in that: A pressure chamber (1) is fixedly connected to one side of the air inlet chamber (2), and a closing chamber (11) is fixedly connected to the side of the pressure chamber (1) away from the air inlet chamber (2), and an exhaust chamber (14) is fixedly connected to the side of the closing chamber (11) away from the pressure chamber (1). A piston cylinder (9) is fixedly connected to the inner wall of the top of the pressure chamber (1), and a piston head (33) is slidably connected to the inside of the piston cylinder (9). A piston rod (32) is fixedly connected to the middle of the side of the piston head (33) away from the air inlet chamber (2), and a first sealing plug (17) is fixedly connected to one end of the piston rod (32) away from the piston head (33), and an outer diameter of the first sealing plug (17) is larger than an inner diameter of a connection between the exhaust chamber (14) and the closing chamber (11). An L-shaped tube (6) is inserted into one side of the bottom of the piston cylinder (9), and the opening of the bottom end of the L-shaped tube (6) faces the air inlet chamber (2). A pressure measuring on-off mechanism is fixedly connected to the bottom of the L-shaped tube (6); The pressure measuring on-off mechanism comprises a pressure measuring bucket (5), a sealing plate (4), a second sealing plug (19), a pressure measuring spring (20), a sleeve (21), a push plate (22), a guide rod (23) and a cantilever (24), wherein the pressure measuring bucket (5) is plugged into the bottom end of the L-shaped tube (6), the sealing plate (4) is fixedly connected to the inner wall circumference of the pressure measuring bucket (5) close to the air inlet chamber (2), a stepped hole (18) is opened in the middle of the sealing plate (4), and the cantilever (24) is fixedly connected to the inner wall circumference of the pressure measuring bucket (5) close to the air inlet chamber (2). The inner wall of the top of the pressure measuring bucket (5) is connected, the guide rod (23) is fixedly connected to one side of the bottom of the cantilever (24), the push plate (22) is fixedly connected to the end of the guide rod (23) away from the cantilever (24), the sleeve (21) is slidably connected to the push plate (22), the pressure measuring spring (20) is fixedly connected between the side of the push plate (22) and the inner wall of the sleeve (21), and the second sealing plug (19) is fixedly connected to the outer wall of the sleeve (21) away from the guide rod (23); The inner wall at the top of the piston cylinder (9) is fixedly connected with an air bag (8), and the interior of the air bag (8) is filled with nitrogen. The air bag (8) is located just above the top end of the L-shaped tube (6); The inner wall at the top of the pressure chamber (1) is fixedly connected to a drainage block (7), and the outer wall on one side of the piston cylinder (9) is fixedly connected to the drainage block (7), and the side of the drainage block (7) close to the air inlet bin (2) is arranged as an inclined surface; The inner wall at the bottom of the pressure chamber (1) is fixedly connected to a support platform (25), and the top of the support platform (25) is tiltedly fixed with a first shaft sleeve (26), the outer wall at the bottom of the pressure measuring bucket (5) is fixedly connected to a second shaft sleeve (30), the second shaft sleeve (30) and the first shaft sleeve (26) are rotatably connected to a same rotating rod (31) via a pin, the top of one side of the first shaft sleeve (26) is fixedly connected to a first connecting ring (27), the top of the rotating rod (31) is fixedly connected to a second connecting ring (29), and the first connecting ring (27) and the second connecting ring (29) are fixedly connected to a same elastic rope (28).

2. A multifunctional pipeline gas self-closing valve according to claim 1, characterized in that: The stepped hole (18) is configured as two annular holes which are interconnected and have different inner diameters, and the inner diameter of the stepped hole (18) on the side close to the second sealing plug (19) is equal to the outer diameter of the second sealing plug (19), and the inner diameter of the other side of the stepped hole (18) is smaller than the outer diameter of the second sealing plug (19), and the side of the second sealing plug (19) away from the sleeve (21) is configured as an arc surface.

3. A multifunctional pipeline gas self-closing valve according to claim 1, characterized in that: The closed cavity (11) is provided with an exhaust port (15) on one side close to the exhaust bin (14), and a plunger (16) is fixedly connected to the first sealing plug (17) on one side close to the exhaust port (15), and the outer diameter of the plunger (16) is adapted to the inner diameter of the exhaust port (15).

4. A multifunctional pipeline gas self-closing valve according to claim 3, characterized in that: Two permanent magnets (13) are symmetrically embedded on one side of the first sealing plug (17) close to the pressure chamber (1), and two positioning columns (12) are symmetrically fixed on one side of the pressure chamber (1) close to the closing chamber (11), the two positioning columns (12) are respectively attached to the two permanent magnets (13), and the positioning columns (12) are made of steel material.

5. The multifunctional pipeline gas self-closing valve according to claim 1, characterized in that: The inner wall at the top of the piston cylinder (9) is fixedly connected to a limit block (35), and two sliding blocks (36) are symmetrically fixed at the bottom of the limit block (35). A limit groove (38) is provided at the top of the piston rod (32), and sliding grooves (37) are provided on the inner walls on both sides of the limit groove (38). The bottom of the limit block (35) is slidably connected to the inside of the limit groove (38), and the two sliding blocks (36) are slidably connected to the inside of the two sliding grooves (37) respectively.

6. The multifunctional pipeline gas self-closing valve according to claim 1, characterized in that: An annular groove is provided on the middle outer wall of the piston head (33), and a sealing ring (34) is clamped on the middle circumference of the piston head (33) through the annular groove, and the outer diameter of the sealing ring (34) is adapted to the inner diameter of the piston cylinder (9).

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