CN218935395U

CN218935395U - Gas self-closing valve

Info

Publication number: CN218935395U
Application number: CN202221848385.3U
Authority: CN
Inventors: 黄陈宝; 黄科淞
Original assignee: Zhejiang Xinqi Pipe Industry Co ltd
Current assignee: Zhejiang Xinqi Pipe Industry Co ltd
Priority date: 2022-07-15
Filing date: 2022-07-15
Publication date: 2023-04-28
Anticipated expiration: 2032-07-15

Abstract

The utility model provides a gas self-closing valve, and belongs to the technical field of valves. The self-closing valve solves the problems that the existing gas self-closing valve is inconvenient to assemble, and the use reliability is insufficient. This gas self-closing valve, including the valve body, the valve opening has been seted up in the valve body, the case is installed to valve opening department, be provided with the valve accuse mechanism that can control case switch valve opening according to the change of atmospheric pressure in the valve body, but valve accuse mechanism includes the pull rod of oscilaltion, the lower extreme of pull rod articulates has the valve control of oscilaltion, integrative guide holder that is located valve opening one side that is provided with in the valve body, the guide way has been seted up on the up end of guide holder, the lateral part that the guide way is close to the valve opening runs through the lateral wall of guide holder and forms the opening, the valve control inserts in the guide way, and the one end of valve control stretches out the opening and can support with the case and lean on. The gas self-closing valve is convenient to assemble and improves the reliability of use.

Description

Gas self-closing valve

Technical Field

The utility model belongs to the technical field of valves, and relates to a gas self-closing valve.

Background

The fuel gas is a combustible gas widely used in the current industrial and agricultural production and civil fields, and the fuel gas is easy to cause serious safety accidents due to the characteristics of inflammability, explosiveness, toxicity and the like, so that the fuel gas entering the burner needs to be ensured to be kept at normal pressure and flow, and is stably and fully combusted. Normally, a gas self-closing valve is arranged in front of a kitchen range, and the valve is automatically closed to prevent gas leakage when overpressure, undervoltage and overcurrent occur.

The gas self-closing valve mainly comprises a magnetic attraction type valve and a mechanical type valve, wherein the magnetic attraction type valve is controlled by matching a magnet with a coating, and the mechanical type valve is controlled by matching a spring with the coating. In the magnetic gas self-closing valve, the magnet with general performance is easy to generate magnetic loss after long-term use, the gas self-closing valve is poor in performance at the later period of use, potential safety hazards are easy to exist, the cost of the magnet with good performance is high, and the market is limited by high selling price. In addition, in actual use, the magnetic gas self-closing valve is found that the gas pressure is easy to be reduced when the gas consumption is high, the gas source is easily automatically cut off, the interlocking closing phenomenon among users is generated, the illusion of general gas stopping is caused, and a plurality of inconveniences are caused for the users and gas companies, and the mechanical gas self-closing valve has no such defects, so the market share of the mechanical gas self-closing valve is continuously increased.

A mechanical pipeline gas self-closing valve as disclosed in Chinese patent literature [ application number: CN201821645121.1, bulletin number: CN209278569U ], comprising a ball valve, an automatic control device with overpressure, underpressure and overcurrent is arranged on the air outlet side of the ball valve cavity. The automatic control device comprises a control cavity, a channel switching mechanism for switching on and off the gas channel is arranged at the gas channel at the integral joint of the control cavity and the ball valve cavity, a touch mechanism for triggering the opening and closing of the channel switching mechanism by moving up and down in the on state of the ball valve is arranged in the control cavity, and a manual control mechanism for controlling the touch mechanism to move up and down is arranged at the upper end of the control cavity. The upper opening of the control cavity is provided with a leather membrane which is used for closing the control cavity and can bulge or collapse under the driving of fuel gas in the control cavity, the center of the leather membrane is provided with a pull rod in a penetrating way up and down, the upper end part of the pull rod positioned above the leather membrane is connected with a manual control mechanism, and the bottom end part of the pull rod positioned below the leather membrane is connected with a touch mechanism.

The touch mechanism comprises a hollow support, a guide channel is formed in the hollow support, a starting support is installed in the guide channel and connected with a pull rod, the starting support is connected with a jack through a jack shaft, two ends of the jack shaft respectively extend into openings on two sides of the starting support and a first guide groove and a second guide groove on two ends of the hollow support, and a torsion spring is sleeved on the jack shaft. The hollow bracket is fixedly connected in the control cavity through a screw, the heights of the first guide groove and the second guide groove are different, and the first guide groove and the second guide groove are both closed at the upper end and open at the lower end. When the hollow bracket is assembled, the positions of the first guide groove and the second guide groove of the hollow bracket are not reversely assembled, and on the other hand, the upper ends of the first guide groove and the second guide groove are closed, and the jack is positioned at the transverse position under the action of the torsion spring, if the starting bracket and the jack are inserted into the hollow bracket from top to bottom, under the condition that the jack rotates to the vertical direction without using external force to overcome the elasticity of the torsion spring, the two ends of the jack can be abutted against the side wall of the upper end of the hollow bracket to cause blocking, so that the jack and the starting bracket cannot be embedded into the hollow bracket. Therefore, if the hollow bracket is fixed in the control cavity, and then the jack and the starting bracket are inserted into the hollow bracket from top to bottom, the jack is pressed by hands to overcome the elasticity of the torsion spring so as to rotate the jack to the vertical direction, and the control cavity is inconvenient to operate because of small operation space; or the jack and the starting bracket are installed from the lower end of the hollow bracket, namely, the jack and the starting bracket are installed in the hollow bracket, then the hollow bracket is fixed in the control cavity, and the starting bracket is generally assembled with a pull rod, a leather membrane, a valve cover, a manual control mechanism and the like before being installed in the control cavity, so that the assembly operation space of the hollow bracket is insufficient, and the assembly is inconvenient. In addition, after the hollow bracket is assembled, the position of the guide channel is often offset due to the existence of installation errors, so that the starting bracket is easy to interfere with the side wall of the hollow bracket when sliding in the guide channel of the hollow bracket, the sensitivity of the sliding resistance of the starting bracket is increased, and the reliability of the gas self-closing valve is reduced. Therefore, the gas self-closing valve is inconvenient to assemble and has insufficient use reliability.

Disclosure of Invention

The utility model aims to solve the problems in the prior art, and provides a gas self-closing valve, which solves the technical problems of inconvenient assembly and insufficient use reliability of the existing gas self-closing valve.

The aim of the utility model can be achieved by the following technical scheme:

the utility model provides a gas self-closing valve, includes the valve body, the valve opening has been seted up in the valve body, the case is installed to valve opening department, be provided with the valve accuse mechanism that can control case switch valve opening according to the change of the internal atmospheric pressure of valve in the valve body, valve accuse mechanism includes the pull rod that can reciprocate, the lower extreme of pull rod articulates there is the valve controlling part that can reciprocate, a serial communication port, be provided with the guide holder that is located valve opening one side in the valve body an organic whole, the guide slot has been seted up on the up end of guide holder, the lateral part that the guide slot is close to the valve opening runs through the lateral wall of guide holder and forms the opening, the valve controlling part inserts in the guide slot, and the one end of valve controlling part stretches out the opening and can support with the case and lean on.

Because the guide seat is integrally arranged in the valve body, the guide seat does not need to be assembled; when the pull rod and the valve control are assembled into the valve body, the valve control can be hinged to the lower end of the pull rod, then the lower end of the pull rod and the valve control are inserted into the guide groove from the upper port of the guide groove, and the side part, close to the valve hole, of the guide groove penetrates through to form an opening, so that the valve control and the pull rod can be arranged in place smoothly in the inserting process by utilizing the opening. In addition, because the guide seat and the valve body are integrally arranged, the guide groove and other structures of the valve body are integrally processed and molded, the guide groove has no position offset formed by installation errors, and interference between the guide groove and the side wall surface of the guide groove when the valve control is moved due to displacement offset of the guide groove can be avoided, so that the valve control is smoothly moved in the guide groove, the working sensitivity of the valve control is ensured, and the working reliability of the gas self-closing valve is improved. Therefore, the gas self-closing valve is convenient to assemble and improves the reliability of use.

In the gas self-closing valve, one end of the valve control close to the valve core is provided with the valve control surface which is inclined upwards, the valve control surface is propped against the valve core to enable the valve core to open the valve hole, one end of the valve control far away from the valve core is provided with the bulge, the baffle is fixed above the bulge on the guide seat, and when the pull rod ascends, the bulge can prop against the baffle to enable the valve control to rotate.

When the valve body is at normal air pressure, the valve control mechanism enables the valve control surface of the valve control to abut against the valve core, the valve core opens the valve hole, and the gas self-closing valve supplies gas normally. When the air pressure in the valve body is smaller than the normal air pressure, namely under-pressure, the valve control mechanism enables the pull rod to descend according to the air pressure change, the valve control surface is separated from the valve core after the pull rod descends, the valve core closes the valve hole, and fuel gas is cut off. When the air pressure in the valve body is larger than normal air pressure, namely the air pressure is over-pressure, the valve control mechanism enables the pull rod to rise according to the air pressure change, after the pull rod rises, the valve control rises, the bulge abuts against the baffle to enable one end, close to the valve core, of the valve control to rotate upwards, so that the valve control surface is separated from the valve core faster, and the valve core can close the valve hole faster to cut off fuel gas. When the valve control is inserted into the guide groove from the upper port of the guide groove during assembly, the valve control can be unseated through the opening on the guide seat, namely, the valve control is close to the valve core, the bulge passes through the baffle and then the valve control and the pull rod are close to the stop block, and the bulge is positioned below the baffle. Therefore, after the bulges and the baffle are arranged, the gas can be cut off more quickly when the overpressure is generated, the reliability of the gas self-closing valve is improved, and the opening is utilized for assembling and abdicating so that the arrangement of the bulges and the baffle can not influence the assembly between the valve control and the guide seat, and the gas self-closing valve is convenient to assemble.

In the gas self-closing valve, the side face of the upper end of the guide groove is provided with the embedded opening, the embedded opening is opposite to the opening, and the baffle is embedded into the embedded opening and fixedly connected with the embedded opening.

The guide groove, the opening and the embedded opening can be milled on the guide seat, so that the processing is convenient. The embedded opening has a positioning function on the baffle plate, is convenient for positioning and mounting the baffle plate, and is favorable for making the gas self-closing valve convenient.

In the gas self-closing valve, the pull rod comprises a guide block inserted into the guide groove, a tension spring is connected between the valve control and the guide block, a fixing convex part is arranged on the side surface, facing away from the valve core, of the guide block, the upper end of the tension spring is sleeved and fixed on the fixing convex part, and the lower end of the tension spring is sleeved and fixed on the convex part.

When the valve body is over-pressurized, the pull rod rises, the bulge is abutted against the baffle plate to enable the valve control to rotate and enable the valve control surface to be quickly separated from the valve core, and the tension spring is stretched at the moment; after the valve core cuts off the fuel gas, the valve body is at atmospheric pressure, the pull rod descends to reset, and meanwhile, the tension spring acts on the valve control to enable the valve control to reversely rotate to reset. When the tension spring is assembled, the upper end of the tension spring is sleeved on the positioning block to be fixed, and the lower end of the tension spring is sleeved on the protrusion to be fixed, so that the assembly is convenient.

In the above gas self-closing valve, two opposite side surfaces of the guide groove are guide surfaces, the opening is located between the two guide surfaces, the two guide surfaces are both plane and parallel, the side surface of the valve control opposite to the guide surface is plane and is in contact with or clearance fit with the corresponding guide surface, and the side surface of the guide block opposite to the guide surface is plane and is in contact with or clearance fit with the corresponding guide surface.

The guide surface and the valve control are matched with the guide block to have a guiding and positioning function. On the one hand, when the gas self-closing valve is used, the pull rod can not rotate circumferentially, so that the stability of the gas self-closing valve is guaranteed; on the other hand, when the gas self-closing valve is assembled, the valve control and the guide block can be smoothly inserted into the guide groove, so that the gas self-closing valve is convenient to assemble.

In the gas self-closing valve, a first rounded transition surface is arranged between the upper end surface of the valve control and the valve control surface, a second rounded transition surface is arranged between the valve control surface and the end surface, close to the valve core, of the valve control, a third rounded transition surface is arranged between the lower end surface of the valve control and the end surface, close to the valve core, of the valve control, and the valve core is provided with a propping head capable of propping against the valve control surface, and the propping head is hemispherical.

The first rounded transition surface, the second rounded transition surface and the third rounded transition surface have guiding function, so that the valve core can be smoothly abutted against or separated from the valve control surface, and the reliability of the gas self-closing valve is guaranteed. Meanwhile, when the valve control is assembled into the guide groove, if the valve core is firstly installed, the valve control can conveniently pass through the valve core smoothly due to the arrangement of the second round corner transition surface and the third round corner transition surface, and the gas self-closing valve is convenient to assemble.

In the gas self-closing valve, the first avoidance port is formed in the side face, facing away from the valve core, of the guide block, the first avoidance port is located below the fixing convex portion, the second avoidance port is formed in one end, away from the valve core, of the valve control, the second avoidance port is located above the protrusion, and one part of the tension spring is located in the first avoidance port and the second avoidance port.

The avoidance port I and the avoidance port II have avoidance function, prevent the tension spring from interfering with the guide block and the valve control, enable the tension spring to move smoothly, and are favorable for guaranteeing the reliability of the gas self-closing valve.

In the gas self-closing valve, the lower end face of the guide block is provided with the protruding hinge lug, the upper end face of the valve control is provided with the hinge groove, the hinge lug is inserted into the hinge groove and hinged with the valve control through the hinge shaft, the upper end of the valve control is abutted against the lower end face of the guide block under the action of the tension spring, two sides of the hinge lug on the lower end face of the guide block are provided with rotating abdicating ports, and when one end of the valve control with the valve control surface rotates upwards, the valve control can enter the rotating abdicating ports.

The cooperation in articulated ear and hinge groove makes valve control and guide block articulated stable, rotates the setting up of giving way the mouth and makes the valve control rotate smoothly, is favorable to guaranteeing the reliability that gas self-closing valve used. During assembly, the hinge lug is inserted into the hinge groove, and then the hinge shaft is penetrated to form hinge, so that the assembly is convenient.

In the gas self-closing valve, the pull rod further comprises a rod body, the rod body and the guide block are arranged in a split mode, and the guide block is fixedly connected to the lower end of the rod body. After the body of rod and guide block are set up to the components of a whole that can function independently, can process body of rod and guide block respectively, make things convenient for the shaping of guide block, and body of rod and guide block can adopt different materials, can reduce material cost.

In the above-mentioned gas self-closing valve, have the disk seat in the valve body, the valve opening transversely sets up on the disk seat, have the interval of ventilating between disk seat and the guide holder, the case includes core, sealing body and elastomer, core slidable wears to establish in the valve opening, the valve opening is stretched out to the one end of core and can support with the valve control and lean on, the valve opening is stretched out to the other end of core and sealing body is fixed, the elastomer can be used on the sealing body makes the sealing body support and seals the valve opening on the disk seat, be provided with the several division board along circumference on the lateral surface of core, form the passageway of ventilating between two adjacent division boards.

When normal air pressure is adopted in the valve body, the valve control surface of the valve control is abutted against the core body of the valve core, the valve control pushes the core body to overcome the elastic force of the elastic body and move in the direction away from the valve control, the sealing body breaks away from the valve seat to open the valve hole, and the gas self-closing valve normally supplies air. When the valve body is under pressure, the pull rod descends, the valve control surface is separated from the valve core after the pull rod descends, the core moves towards the direction close to the valve control under the action of elastic force of the elastomer, and the sealing body abuts against the valve seat to close the valve hole and cut off fuel gas. When the valve body is over-pressurized, the pull rod is lifted, after the pull rod is lifted, the valve control is lifted and the bulge is abutted against the baffle plate, so that one end of the valve control, which is close to the valve core, is upwards rotated, the valve control surface is separated from the valve core, the core moves towards the direction, which is close to the valve control, under the action of elastic force of the elastomer, and the sealing body is abutted against the valve seat to close the valve hole, so that gas is cut off. When the valve control is inserted into the guide groove from the upper port of the guide groove during assembly, even if the valve core is assembled first, the valve control can push the valve core away to be smoothly installed in the guide groove, and the valve core cannot influence the assembly of the valve control.

Compared with the prior art, the utility model has the following advantages:

the guide seat is integrally arranged in the valve body, the side part of the guide groove, which is close to the valve hole, penetrates through the side wall of the guide seat and forms an opening, and the opening has a abdication function, so that the gas self-closing valve is convenient to assemble and the working reliability is improved. The upper baffle of the guide seat is matched with the bulge on the valve control, so that the gas self-closing valve can be closed more quickly when in overpressure, and the working reliability is improved. The tension spring is convenient to install and is beneficial to automatic resetting of the valve control, so that the gas self-closing valve is convenient to use. The gas self-closing valve can be automatically closed when in overpressure, undervoltage and overcurrent, is safe and reliable to use, and has the advantages of simple structure, convenient assembly and convenient use.

Drawings

FIG. 1 is a perspective view of a first embodiment of the present gas self-closing valve;

FIG. 2 is an exploded perspective view of a first embodiment of the present gas self-closing valve;

FIG. 3 is a cross-sectional view of the present gas self-closing valve embodiment in an un-vented or under-pressure condition;

FIG. 4 is a cross-sectional view of the present gas self-closing valve embodiment at normal gas pressure;

FIG. 5 is a cross-sectional view of the present gas self-closing valve embodiment at overpressure;

FIG. 6 is a cross-sectional view of the present gas self-closing valve embodiment at first in an over-flow condition;

FIG. 7 is a perspective view of a valve body in a first embodiment of the present gas self-closing valve;

FIG. 8 is a perspective view of a baffle installed in a valve body in a first embodiment of the present gas self-closing valve;

FIG. 9 is a perspective view of a guide block and valve control member combination in a first embodiment of the present gas self-closing valve;

FIG. 10 is a split perspective view of a guide block and a valve control member in a first embodiment of the fuel gas self-closing valve;

FIG. 11 is a perspective view of a valve cartridge in a first embodiment of the present gas self-closing valve;

FIG. 12 is a split perspective view of a valve cover, an adjustment sleeve, a knob sleeve and a pull knob in a first embodiment of the present gas self-closing valve;

FIG. 13 is a cross-sectional view of a valve cover, a pull rod, a valve control, a main spring, a membrane, a pull button and a button sleeve assembled in a first embodiment of the gas self-closing valve;

FIG. 14 is a schematic view showing the position of the button sleeve after the button sleeve is lifted in the first embodiment of the fuel gas self-closing valve;

fig. 15 is a cross-sectional view of the second embodiment of the gas self-closing valve at normal gas pressure.

In the figure, 1, a valve body; 1a, an air inlet end; 1a1, an air inlet hole; 1b, an air outlet end; 1b1, air outlet holes; 1c, valve seat; 1c1, a valve hole; 1d, a guide seat; 1d1, a guide groove; 1d2, opening; 1d3, a guide surface; 1d4, embedding opening; 1e, ventilation interval; 1f, riveting edges; 2. a valve cover; 2a, a platform; 2b, a connecting cylinder; 2c, fixing the edge; 3. a valve core; 3a, a core; 3a1, an abutment head; 3a2, a partition plate; 3a3, a ventilation channel; 3b, a sealing body; 3c, an elastomer; 4. a ball valve; 5. a pull rod; 5a, a rod body; 5a1, a baffle ring; 5b, a guide block; 5b1, fixing projections; 5b2, a first avoidance port; 5b3, hinge ears; 5b4, rotating the abdication port; 6. a valve control; 6a, valve control surface; 6b, a first rounded corner transition surface; 6c, a fillet transition surface II; 6d, a fillet transition surface III; 6e, a bulge; 6f, avoiding a second port; 6g, a hinge groove; 7. a tension spring; 8. a coating film; 9. a main spring; 10. a backing plate; 11. a nut; 12. adjusting the sleeve; 12a, positioning a retaining shoulder; 12b, positioning holes; 12c, an extension; 12d, a thread section; 12e, external threads; 12f, limiting rings; 13. pulling a button; 13a, canopy; 13b, connecting columns; 13c, a ventilation groove; 14. a button sleeve; 14a, caulking grooves; 14b, a stop; 15. a baffle; 16. an overflow valve; 16a, an over-flow valve seat; 16b, an overcurrent valve core; 16c, an overcurrent spring; 17. and a hinge shaft.

Detailed Description

The following are specific embodiments of the present utility model and the technical solutions of the present utility model will be further described with reference to the accompanying drawings, but the present utility model is not limited to these embodiments.

Example 1

As shown in fig. 1-3, a gas self-closing valve comprises a valve body 1 and a valve cover 2 which are fixedly connected, wherein a valve hole 1c1 is formed in the valve body 1, a valve core 3 is installed at the position of the valve hole 1c1, and a valve control mechanism capable of controlling the valve core 3 to open and close the valve hole 1c1 according to the change of the gas pressure in the valve body 1 is arranged in the valve body 1. The two ends of the valve body 1 are respectively an air inlet end 1a and an air outlet end 1b, a valve cavity is arranged in the valve body 1, the upper end of the valve body 1 is provided with a mounting opening, the mounting opening is communicated with the valve cavity, and the valve cover 2 is fixedly connected to the mounting opening. An air inlet hole 1a1 is formed in the air inlet end 1a, the air inlet hole 1a1 is communicated with the valve cavity through a valve hole 1c1, an air outlet hole 1b1 is formed in the air outlet end 1b, a ball valve 4 is arranged in the air outlet hole 1b1, and the air outlet hole 1b1 is communicated with the valve cavity through the ball valve 4.

As shown in fig. 2-10 and 13, the valve control mechanism comprises a pull rod 5 capable of ascending and descending, and a valve control 6 capable of swinging up and down is hinged at the lower end of the pull rod 5. The pull rod 5 comprises a rod body 5a and a guide block 5b, and the valve control 6 is hinged on the guide block 5 b. The guide block 5b is fixed on the lower end of the rod body 5a, and the rod body 5a and the guide block 5b can be fixed in a split manner or integrally formed. When the rod body 5a and the guide block 5b are fixed in a split manner, the lower end of the rod body 5a is inserted into the guide block 5b and forms threaded connection. The valve body 1 is provided with a valve seat 1c between the air inlet hole 1a1 and the valve cavity, and the valve hole 1c1 is transversely arranged on the valve seat 1 c. A guide seat 1d positioned at one side of the valve hole 1c1 is integrally arranged in the valve body 1, the guide seat 1d is positioned between the valve hole 1c1 and the air outlet hole 1b1, and a ventilation interval 1e is arranged between the valve seat 1c and the guide seat 1 d. The ventilation interval 1e is not only used for ventilation, but also can provide a space for the installation of the valve control 6, so that the valve control 6 is smoothly installed from top to bottom. The upper end face of the guide seat 1d is provided with a guide groove 1d1, the side part of the guide groove 1d1, which is close to the valve hole 1c1, penetrates through the side wall of the guide seat 1d and forms an opening 1d2, the valve control 6 is inserted into the guide groove 1d1, and one end of the valve control 6 extends out of the opening 1d2 and can be abutted against the valve core 3. The guide block 5b and the valve control 6 are circumferentially positioned in the guide groove 1d1 and can be lifted up and down in the guide groove 1d 1.

One end of the valve control 6, which is close to the valve core 3, is provided with an upward-inclined valve control surface 6a, and the valve control surface 6a abuts against the valve core 3 to enable the valve core 3 to open the valve hole 1c 1. The valve control surface 6a may be planar or cambered or parabolic. A first rounded transition surface 6b is arranged between the upper end surface of the valve control 6 and the valve control surface 6a, a second rounded transition surface 6c is arranged between the valve control surface 6a and the end surface of the valve control 6, which is close to the valve core 3, and a third rounded transition surface 6d is arranged between the end surface of the valve control 6, which is close to the valve core 3, and the lower end surface of the valve control 6. The valve control 6 is provided with the bulge 6e on one end far away from the valve core 3, and the end part of the bulge 6e is in a semicircle sphere shape, so that friction between the bulge 6e and the guide seat 1d can be reduced, and the valve control 6 can move smoothly in the guide groove 1d 1. Two opposite side surfaces of the guide groove 1d1 are guide surfaces 1d3, the opening 1d2 is positioned between the two guide surfaces 1d3, and the two guide surfaces 1d3 are both plane surfaces and are arranged in parallel; the side surface of the valve control 6 opposite to the guide surface 1d3 is a plane and is in abutting or clearance fit with the corresponding guide surface 1d 3; the guide block 5b is planar on the side opposite the guide surface 1d3 and is in abutment or clearance fit with the corresponding guide surface 1d 3.

A baffle plate 15 is fixed above the bulge 6e on the guide seat 1d, one end of the baffle plate 15, which is close to the opening 1d2, stretches into the guide groove 1d1, and the bulge 6e can abut against the baffle plate 15 to enable the valve control 6 to rotate when the pull rod 5 ascends. The side of guide slot 1d1 upper end has been seted up and has been inlayed mouthful 1d4, inlays mouthful 1d4 upwards runs through the up end of guide holder 1d, inlays mouthful 1d4 and opening 1d2 relatively, and baffle 15 is embedded into inlaying mouthful 1d4 and fixed connection, and baffle 15 stretches into in the guide slot 1d towards the one end of opening 1d 2. Baffle 15 passes through screw fixed connection on guide holder 1d, also can be provided with the riveting limit on guide holder 1d, fixes baffle 15 on guide holder 1d through the riveting limit after the riveting. A tension spring 7 is connected between the valve control 6 and the guide block 5b, a fixing convex part 5b1 is arranged on the side surface, facing away from the valve core 3, of the guide block 5b, the upper end of the tension spring 7 is sleeved and fixed on the fixing convex part 5b1, and the lower end of the tension spring 7 is sleeved and fixed on the protrusion 6 e. The side surface of the guide block 5b, which is opposite to the valve core 3, is provided with a first avoidance port 5b2, the first avoidance port 5b2 is positioned below the fixed convex part 5b1, one end of the valve control 6, which is far away from the valve core 3, is provided with a second avoidance port 6f, the second avoidance port 6f is positioned above the bulge 6e, and a part of the tension spring 7 is positioned in the first avoidance port 5b2 and the second avoidance port 6 f.

The lower end face of the guide block 5b is provided with a protruding hinge lug 5b3, the upper end face of the valve control 6 is provided with a hinge groove 6g, and the hinge lug 5b3 is inserted into the hinge groove 6g and is hinged with the valve control 6 through a hinge shaft 17. Under the action of the tension spring 7, the upper end of the valve control 6 is propped against the lower end face of the guide block 5b, rotation yielding ports 5b4 are formed in two sides of the hinge lug 5b3 on the lower end face of the guide block 5b, and when one end of the valve control 6 with the valve control surface 6a rotates upwards, the valve control 6 can enter the rotation yielding ports 5b 4.

As shown in fig. 2-8 and 11, the air inlet hole 1a1 is fixedly connected with an overflow valve 16, and the valve core 3 is positioned between the overflow valve 16 and the guide seat 1 d. The overcurrent valve 16 includes an overcurrent valve seat 16a, an overcurrent valve core 16b and an overcurrent spring 16c, the filter valve seat 16a is fixed in the air inlet hole 1a1, the filter valve seat 16a is provided with an air vent, and the overcurrent spring 16c is connected between the overcurrent valve seat 16a and the overcurrent valve core 16 b. Under the elastic force of the overcurrent spring 16c, the overcurrent valve core 16b is far away from the vent hole to open the vent hole, namely, the overcurrent valve 16 is in a normally open state. When the flow rate of the gas passing through the gas inlet hole 1a1 exceeds the safety flow rate, the gas flow can push the flow valve core 16b to close the vent hole against the elastic force of the flow spring 16c when passing through the flow valve core 16 b. The valve body 3 includes a core body 3a, a sealing body 3b, and an elastic body 3c, and the core body 3a is slidably inserted in the valve hole 1c 1. One end of the core body 3a extends out of the valve hole 1c1 and can be abutted against the valve control 6, and the other end of the core body 3a extends out of the valve hole 1c1 and is fixed with the sealing body 3 b. The valve element 3 has an abutment head 3a1 at an end opposite to the valve control 6, the abutment head 3a1 being able to abut against the valve control surface 6a, and the abutment head 3a1 is hemispherical. A plurality of partition plates 3a2 are circumferentially arranged on the outer side surface of the core body 3a, ventilation channels 3a3 are formed between two adjacent partition plates 3a2, and the partition plates 3a2 are uniformly circumferentially arranged. In the present embodiment, four partition plates 3a2 are provided, and the number of partition plates 3a2 may be increased or decreased as appropriate, and two, three, five, six, or the like may be provided. The elastic body 3c is a compression spring or a tower spring, one end of the elastic body 3c is abutted against the sealing body 3b, the other end of the elastic body 3c is abutted against the overflow valve 16, and when the valve control 6 is not abutted against the valve core 3, the elastic body 3c acts on the sealing body 3b to enable the sealing body 3b to be abutted against the valve seat 1c to seal the orifice of the valve hole 1c 1.

As shown in fig. 2, 3 and 12-13, the valve control mechanism further comprises a diaphragm 8 and a main spring 9, wherein the inner edge of the diaphragm 8 is fixed with the rod body 5a, the outer edge of the diaphragm 8 is fixed with the valve body 1, and the lower end of the rod body 5a passes through the diaphragm 8 and is connected with the guide block 5 b. The rod body 5a is provided with a convex baffle ring 5a1 below the inner edge of the leather membrane 8, and the leather membrane 8 is abutted against the upper end surface of the baffle ring 5a 1. The rod body 5a is sleeved with a base plate 10 and a nut 11, the base plate 10 is positioned above the inner edge of the leather film 8, and the nut 11 is positioned above the base plate 10 and is in threaded connection with the rod body 5 a. The nut 11 is tightened to press the nut 11 against the backing plate 10, so that the inner edge of the coating 8 is pressed and fixed between the backing plate 10 and the retainer 5a 1. The main spring 9 is sleeved on the rod body 5a and is positioned above the base plate 10, and the main spring 9 is sleeved outside the nut 11.

The upper end threaded connection of valve gap 2 has adjusting sleeve 12, and the upper end of body of rod 5a wears to locate adjusting sleeve 12, and the both ends of main spring 9 are supported respectively on adjusting sleeve 12 and body of rod 5 a. The inner side surface of the adjusting sleeve 12 is provided with a positioning stop shoulder 12a, the upper end of the main spring 9 is embedded into the inner hole of the adjusting sleeve 12 and is abutted against the positioning stop shoulder 12a, and the lower end of the main spring 9 is abutted against the backing plate 10. The outer side surface of the adjusting sleeve 12 is provided with a positioning hole 12b. The adjusting sleeve 12 comprises an extending section 12c extending out of the valve cover 2, the extending section 12c is cylindrical, the positioning hole 12b is arranged on the extending section 12c, and the positioning hole 12b penetrates through the inner side surface of the extending section 12 c. The positioning holes 12b are two and symmetrically arranged. The adjusting sleeve 12 further comprises a thread section 12d inserted into the valve cover 2, the outer side part of the thread section 12d protrudes out of the outer side surface of the protruding section 12c, the thread section 12d is located below the protruding section 12c, an external thread 12e is arranged on the outer side surface of the thread section 12d, and the external thread 12e extends to the upper end surface of the thread section 12d in a spiral mode.

The valve cover 2 is in a reverse bowl shape, the upper end of the valve cover 2 is provided with a flat plate-shaped and perforated platform 2a, the inner edge of the platform 2a is downwards folded to form a connecting cylinder 2b, and the adjusting sleeve 12 is in threaded connection with the connecting cylinder 2b. The lower edge of the valve cover 2 is turned outwards to form a fixed edge 2c, and the upper end of the valve body 1 is provided with a riveting edge 1f. The outer edge of the diaphragm 8 abuts against the upper end face of the valve body 1, and the fixing edge 2c abuts against the upper surface of the outer edge of the diaphragm 8. The riveting edge 1f is positioned on the outer side of the fixing edge 2c before riveting, and the riveting edge 1f abuts against the upper surface of the fixing edge 2c after riveting to fix the valve cover 2 and the leather membrane 8 on the valve body 1. The riveting edges 1f in fig. 1, 2, 7 and 8 are all structures when not being riveted, and the riveting edges 1f in fig. 3, 4, 5, 6 and 15 are all structures after being riveted.

The upper end of the pull rod 5 is connected with a pull button 13, and the pull button 13 is in threaded connection with the upper end of the pull rod 5. The pull button 13 includes a canopy 13a and a connection post 13b protruding from the lower surface of the canopy 13a, the connection post 13b being inserted into the adjustment sleeve 12, and the upper end of the pull rod 5 being inserted into the connection post 13b and being screwed. The outer side surface of the connecting column 13b is provided with a vent groove 13c, and the vent groove 13c extends in the vertical direction. The inner cavity of the valve cover 2 is communicated with the outside through the vent groove 13c, the vent groove 13c and the positioning hole 12b, so that the upper part of the leather membrane 8, namely the inner cavity of the valve cover 2, is kept at the atmospheric pressure. The button sleeve 14 is sleeved outside the extension section 12c, a caulking groove 14a is formed in the upper end face of the button sleeve 14, and the umbrella cover 13a is positioned in the caulking groove 14a and abuts against the bottom face of the caulking groove 14 a. The inner side surface of the lower end of the button sleeve 14 is provided with a stop part 14b, the outer side surface of the upper end of the extending section 12c is provided with a limiting ring 12f, the stop part 14b is positioned below the limiting ring 12f and can be abutted against the limiting ring 12f, and when the stop part 14b is abutted against the limiting ring 12f, the positioning hole 12b is positioned below the button sleeve 14. In order to enable the knob sleeve 14 to be clamped on the extending section 12c of the adjusting sleeve 12, an annular deformation groove is formed in the lower end face of the knob sleeve 14, the knob sleeve 14 is divided into an inner sleeve and an outer sleeve through the deformation groove, a plurality of vertically arranged deformation strip grooves are formed in the inner side face of the inner sleeve, the inner sleeve is divided into a plurality of elastic strips by the deformation strip grooves, and a stop portion 14b is arranged on the inner side face of the lower end of the elastic strips. When the knob sleeve 14 is sleeved on the adjusting sleeve 12, the limiting ring 12f is sleeved from top to bottom, in the sleeving process, the limiting ring 14 f abuts against the limiting ring 12f to enable the elastic strip to elastically deform outwards, and when the limiting ring 12f passes through the limiting ring 14b, the elastic strip is reset, and the limiting ring 12f can be stopped by the limiting ring 14 b.

When the gas self-closing valve is assembled, the ball valve 4, the valve core 3 and the overflow valve 16 can be firstly installed in the valve body 1, and the baffle 15 is fixedly connected to the guide seat 1 d. And then the valve control 6, the pull rod 5, the main spring 9, the leather membrane 8, the valve cover 2, the adjusting sleeve 12, the pull button 13 and the button sleeve 14 are assembled into a whole: the hinge lug 5b3 of the guide block 5b is inserted into the hinge groove 6g of the valve control 6, the hinge shaft 17 is penetrated to enable the guide block 5b to form hinge with the valve control 6, and then the tension spring 7 is fixedly connected to the fixing convex part 5b1 and the convex part 6 e; sleeving the coating 8 on the rod body 5a, enabling the inner edge of the coating 8 to be abutted against the baffle ring 5a1 of the rod body 5a, sleeving the base plate 10 on the rod body 5a, sleeving the nut 11 on the rod body 5a and tightening, and fixing the coating 8 and the base plate 10 on the rod body 5 a; a guide block 5b is screwed on the lower end of the rod body 5a and screwed down; sleeving the main spring 9 on the rod body 5 a; screwing the adjustment sleeve 12 onto the valve cap 2; the rod body 5a is put in from the lower end of the valve cover 2, the upper end of the rod body 5a is inserted into the adjusting sleeve 12, the upper end of the main spring 9 is inserted into the positioning stop shoulder 12a of the adjusting sleeve 12, and the lower end of the main spring 9 is abutted against the backing plate 10; the knob sleeve 14 is sleeved on the extending section 12c of the adjusting sleeve 12, then the connecting column 13b of the pull knob 13 is inserted into the adjusting sleeve 12, the pull knob 13 and the rod body 5a are in threaded connection, and after the pull knob 13 is released, the umbrella cover 13a of the pull knob 13 is embedded into the embedding groove 14a of the knob sleeve 14. The valve control 6, the pull rod 5, the main spring 9, the membrane 8, the valve cover 2, the adjusting sleeve 12, the pull button 13 and the button sleeve 14 are thus assembled as one whole. The valve cover 2 and the pull rod 5 are then integrally covered into the valve body 1: the valve control 6 enters the valve cavity from the upper end mounting port of the valve body 1, is inserted into the guide groove 1d1 from the notch of the guide groove 1d1, and is smoothly embedded into the guide groove 1d1 by utilizing the opening 1d2 on the guide seat 1d and the ventilation interval 1e between the guide seat 1d and the valve seat 1 c; the outer edge of the leather film 8 is abutted against the upper end face of the valve body 1 during covering, and the fixed edge 2c at the lower end of the valve cover 2 is embedded into the inner side of the riveting edge 1f before riveting. After the valve cover 2 is covered on the valve body 1, the riveting edge 1f is riveted, so that the riveting edge 1f is folded and abutted against the valve cover 2 to fix the outer edges of the valve cover 2 and the leather film 8 on the valve body 1. Thus, the assembly of the gas self-closing valve is completed. In order to ensure the stability and reliability of the gas self-closing valve, screw thread glue is added at the screw thread connection part during assembly, the adjusting sleeve 12 and the pull button 13 can be rotated to adjust before the screw thread glue is solidified, and all parts are fixed and stable after the screw thread glue is solidified.

As shown in fig. 3, when the gas self-closing valve is not ventilated, under the action of the elastic force of the main spring 9, the umbrella cover 13a of the pull button 13 abuts against the button sleeve 14, the valve control 6 is at the lowest position and does not abut against the valve core 3, and the valve core 3 closes the valve hole 1c 1. As shown in fig. 4, after the gas self-closing valve is ventilated, the pull rod 5 is pulled upwards through the knob sleeve 14, the valve control surface 6a of the valve control 6 is abutted against the valve core 3, the valve core 3 moves in a direction away from the valve control 6, the valve core 3 opens the valve hole 1c1, normal air pressure is generated in the valve body 1 after the valve hole 1c1 is opened, after the pull rod 5 is released, the film 8 receives air pressure to generate upward pulling force on the pull rod 5, the pulling force and the elastic force of the main spring 9 keep balance, so that the pull rod 5 keeps a suspension state, the valve control 6 keeps abutted against the valve core 3, the valve core 3 keeps the valve hole 1c1 open, and the gas self-closing valve normally supplies air. As shown in fig. 3, when the air pressure in the valve body 1 is smaller than the normal air pressure, namely under-pressure, the air pressure received by the coating film 8 is reduced to cause the pull rod 5 to descend, the valve control 6 descends and is separated from the valve core 3 after the pull rod 5 descends, and the valve core 3 closes the valve hole 1c1 to cut off fuel gas; after the valve hole 1c1 is closed to cut off the fuel gas, the air pressure in the valve body 1 becomes the atmospheric pressure, the valve control 6 returns to the lowest position under the elastic force of the main spring 9, and the valve core 3 keeps closing the valve hole 1c 1. As shown in fig. 5, when the air pressure in the valve body 1 is greater than the normal air pressure, namely the air pressure is over-pressure, the air pressure increase suffered by the film 8 causes the pull rod 5 to rise, after the pull rod 5 rises, the valve control 6 rises, and the bulge 6e abuts against the baffle 15 at the same time to enable one end of the valve control 6 close to the valve core 3 to rotate upwards, so that the valve control surface 6a is separated from the valve core 3 more quickly, and the valve core 3 can close the valve hole 1c1 more quickly to cut off fuel gas; after the valve hole 1c1 is closed to cut off the fuel gas, the interior of the valve body 1 is at atmospheric pressure, as shown in fig. 3, under the action of the elastic force of the main spring 9, the valve control 6 is lowered to the lowest position, the valve control 6 is quickly reset under the action of the tension spring 7, and the effect that the valve control 6 is abutted against the valve core 3 to influence the fuel gas cutting off is avoided. As shown in fig. 6, when an overcurrent (gas leakage) occurs, the overcurrent valve element 16b receives a large thrust of the air flow, overcomes the elastic force of the overcurrent spring 16c and abuts against the overcurrent valve seat 16c to close the vent hole in the overcurrent valve seat 16c, and the overcurrent valve 16 is closed to close the air inlet hole 1a 1; after the gas is cut off, the valve body 1 is at atmospheric pressure, the valve control 6 returns to the lowest position under the action of the elastic force of the main spring 9, the valve core 3 keeps the valve hole 1c1 closed, after the valve core 3 closes the valve hole 1c1, no air flow passes through the position of the overflow valve core 16b, as shown in fig. 3, under the action of the elastic force of the overflow spring 16c, the vent hole of the overflow valve seat 16c is opened when the overflow valve core 16b is pushed open, and the overflow valve 16 is restored to the normally open state.

In order to realize ventilation of the gas self-closing valve under normal gas pressure, automatic closing is required under pressure and over pressure, the elasticity of the main spring 9 is required to be in a proper range, therefore, after the gas self-closing valve is assembled, the performance of the gas self-closing valve is required to be detected, when the elasticity of the main spring 9 is required to be regulated after detection, the knob sleeve 14 is pulled up to the position of the knob sleeve 14 shown in fig. 14 to expose the positioning hole 12b, then a rotating rod is inserted into the positioning hole 12b of the adjusting sleeve 12, then the adjusting sleeve 12 is driven to rotate by the rotating rod to enable the adjusting sleeve 12 to lift up and down, the elasticity of the main spring 9 is changed, the rotating rod is pulled out from the positioning hole 12b after the regulation is completed, and the knob sleeve 14 descends to cover the positioning hole 12b again. For a product to be regulated, when the air pressure of the gas self-closing valve is larger than the maximum value of the normal air pressure range, the elastic force of the main spring 9 is too large, the adjusting sleeve 12 is rotated to enable the adjusting sleeve 12 to rise, and the elastic force of the main spring 9 is reduced; when the gas pressure when the gas self-closing valve is closed is smaller than the maximum value of the normal gas pressure range, the elastic force of the main spring 9 is too small, the adjusting sleeve 12 is rotated to enable the adjusting sleeve 12 to descend, and the elastic force of the main spring 9 is increased. Therefore, after the gas self-closing valve is assembled, the gas self-closing valve does not need to be disassembled again, the elasticity of the main spring 9 can be adjusted as long as the adjusting sleeve 12 is driven to rotate through the positioning hole 12b, namely, the critical pressure value in overpressure can be adjusted, and the adjustment is convenient.

In addition, as the guide seat 1d is integrally arranged in the valve body 1, the guide seat 1d does not need to be assembled; when the pull rod 5 and the valve control 6 are assembled into the valve body 1, the lower end of the pull rod 5 and the valve control 6 are inserted into the guide groove 1d1 from the upper port of the guide groove 1d1, and as the side part of the guide groove 1d1, which is close to the valve hole 1c1, is penetrated to form an opening 1d2 and a ventilation interval 1e is arranged between the valve seat 1c and the guide seat 1d, the opening 1d2 and the ventilation interval 1e can be utilized for yielding in the inserting process, so that the valve control 6 and the pull rod 5 are smoothly installed in place. In addition, since the guide seat 1d and the valve body 1 are integrally arranged, the guide groove 1d1 and other structures of the valve body 1 are integrally processed and formed, the guide groove 1d1 has no position offset formed by installation errors, interference between the valve control 6 caused by displacement offset of the guide groove 1d1 and the side wall surface of the guide groove 1d1 can be avoided, the valve control 6 can move smoothly in the guide groove 1d1, the working sensitivity of the valve control 6 is ensured, and the working reliability of the gas self-closing valve is improved. Therefore, the gas self-closing valve is convenient to assemble and improves the reliability of use. The gas self-closing valve can be automatically closed when in overpressure, undervoltage and overcurrent, is safe and reliable to use, and has the advantages of simple structure, convenient assembly and convenient use.

Example two

As shown in fig. 15, if the valve body 3 is capable of automatically closing the valve hole 1c1 at the time of overcurrent, the overcurrent valve 16 may be eliminated. A locating groove is formed in the hole wall surface of the air inlet hole 1a1, a clamp spring, a filter screen and a bracket are sequentially fixed in the locating groove, an air passing hole is formed in the bracket, the bracket is close to the valve core 3, and the elastic body 3c abuts against the bracket. The other structure is the same as that of the first embodiment.

The specific embodiments described herein are offered by way of example only to illustrate the spirit of the utility model. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions thereof without departing from the spirit of the utility model or exceeding the scope of the utility model as defined in the accompanying claims.

Claims

1. The utility model provides a gas self-closing valve, includes valve body (1), valve opening (1 c 1) has been seted up in valve body (1), case (3) are installed to valve opening (1 c 1) department, be provided with the valve accuse mechanism that can control case (3) switch valve opening (1 c 1) according to the change of atmospheric pressure in valve body (1), valve accuse mechanism includes pull rod (5) that can reciprocate, the lower extreme of pull rod (5) articulates has valve control (6) that can reciprocate, a serial communication port, valve body (1) are interior to be provided with guide holder (1 d) that are located valve opening (1 c 1) one side integratively, guide slot (1 d 1) have been seted up on the up end of guide holder (1 d), the lateral part that guide slot (1 d 1) is close to valve opening (1 d) is run through the lateral wall of guide holder (1 d) and is formed opening (1 d 2), valve control (6) inserts in guide slot (1 d 1), and one end that valve control (6) stretches out opening (1 d 2) and can support with case (3).

2. The gas self-closing valve according to claim 1, wherein one end of the valve control (6) close to the valve core (3) is provided with a valve control surface (6 a) which is inclined upwards, the valve control surface (6 a) is abutted against the valve core (3) to enable the valve core (3) to open the valve hole (1 c 1), one end of the valve control (6) far away from the valve core (3) is provided with a bulge (6 e), a baffle plate (15) is fixed above the bulge (6 e) on the guide seat (1 d), and the bulge (6 e) can be abutted against the baffle plate (15) to enable the valve control (6) to rotate when the pull rod (5) ascends.

3. The gas self-closing valve according to claim 2, wherein an embedding opening (1 d 4) is formed in the side surface of the upper end of the guide groove (1 d 1), the embedding opening (1 d 4) is opposite to the opening (1 d 2), and the baffle plate (15) is embedded into the embedding opening (1 d 4) and fixedly connected.

4. The gas self-closing valve according to claim 2, wherein the pull rod (5) comprises a guide block (5 b) inserted into the guide groove (1 d 1), a tension spring (7) is connected between the valve control (6) and the guide block (5 b), a fixing convex part (5 b 1) is arranged on the side surface, facing away from the valve core (3), of the guide block (5 b), the upper end of the tension spring (7) is sleeved and fixed on the fixing convex part (5 b 1), and the lower end of the tension spring (7) is sleeved and fixed on the convex part (6 e).

5. The gas self-closing valve according to claim 4, wherein two opposite side surfaces of the guide groove (1 d 1) are guide surfaces (1 d 3), the opening (1 d 2) is located between the two guide surfaces (1 d 3), the two guide surfaces (1 d 3) are all plane and are arranged in parallel, the side surface of the valve control (6) opposite to the guide surface (1 d 3) is plane and is in contact with or clearance fit with the corresponding guide surface (1 d 3), and the side surface of the guide block (5 b) opposite to the guide surface (1 d 3) is plane and is in contact with or clearance fit with the corresponding guide surface (1 d 3).

6. The gas self-closing valve according to claim 2, 3, 4 or 5, wherein a first rounded transition surface (6 b) is arranged between the upper end surface of the valve control (6) and the valve control surface (6 a), a second rounded transition surface (6 c) is arranged between the valve control surface (6 a) and the end surface of the valve control (6) close to the valve core (3), a third rounded transition surface (6 d) is arranged between the lower end surface of the valve control (6) and the end surface of the valve control (6) close to the valve core (3), an abutting head (3 a 1) capable of abutting against the valve control surface (6 a) is arranged on the valve core (3), and the abutting head (3 a 1) is in a semicircular sphere shape.

7. The gas self-closing valve according to claim 4, wherein a first avoidance port (5 b 2) is formed in the side surface, facing away from the valve core (3), of the guide block (5 b), the first avoidance port (5 b 2) is located below the fixing convex portion (5 b 1), a second avoidance port (6 f) is formed in one end, far away from the valve core (3), of the valve control (6), the second avoidance port (6 f) is located above the protrusion (6 e), and a part of the tension spring (7) is located in the first avoidance port (5 b 2) and the second avoidance port (6 f).

8. The gas self-closing valve according to claim 4, 5 or 7, wherein the lower end face of the guide block (5 b) is provided with a protruding hinge lug (5 b 3), the upper end face of the valve control (6) is provided with a hinge groove (6 g), the hinge lug (5 b 3) is inserted into the hinge groove (6 g) and is hinged with the valve control (6) through a hinge shaft (17), the upper end of the valve control (6) is abutted against the lower end face of the guide block (5 b) under the action of a tension spring (7), two sides of the hinge lug (5 b 3) on the lower end face of the guide block (5 b) are provided with rotation yield openings (5 b 4), and when one end of the valve control (6) with the valve control surface (6 a) rotates upwards, the valve control (6) can enter the rotation yield openings (5 b 4).

9. The gas self-closing valve according to claim 4, 5 or 7, wherein the pull rod (5) further comprises a rod body (5 a), the rod body (5 a) and the guide block (5 b) are arranged in a split manner, and the guide block (5 b) is fixedly connected to the lower end of the rod body (5 a).

10. The gas self-closing valve according to any one of claims 1 to 5, wherein the valve body (1) is provided with a valve seat (1 c), the valve seat (1 c 1) is transversely arranged on the valve seat (1 c), a ventilation interval (1 e) is arranged between the valve seat (1 c) and the guide seat (1 d), the valve core (3) comprises a core body (3 a), a sealing body (3 b) and an elastic body (3 c), the core body (3 a) is slidably penetrated in the valve seat (1 c 1), one end of the core body (3 a) extends out of the valve seat (1 c 1) and can be abutted against a valve control (6), the other end of the core body (3 a) extends out of the valve seat (1 c 1) and is fixed with the sealing body (3 b), the elastic body (3 c) can act on the sealing body (3 b) to enable the sealing body (3 b) to abut against the valve seat (1 c) to seal the valve seat (1 c), and a plurality of partition plates (3 a) are arranged on the outer side surface of the core body (3 a) along the circumference to form a plurality of adjacent partition plates (3 a) and form a ventilation channel between two partition plates (3 a 2).