An automatic gas cut-off valve

Abstract

The present invention discloses a gas automatic cut-off valve, belonging to the field of gas valves. A gas automatic cut-off valve includes: a housing provided with a through chamber for gas passage; a support ring fixedly located inside the housing and disposed near the gas outlet side; and a reset core located inside the housing and disposed near the gas inlet side; the reset core is located inside the support ring and is made of an elastic material to have the ability to fit and abut against the inner wall of the support ring for sealing; a bowl-shaped groove is formed on the end face of the reset core facing the gas incoming direction to receive the gas incoming pressure; the reset core and the support ring are connected by a bracket made of an elastic material, and the bracket provides an elastic force in the axial direction to enable the reset core to have the ability to maintain a distance from the support ring; it can achieve automatic closing of the valve when gas leaks and effectively ensure the sealing performance of the valve, and has a simple structure without the assistance of electrical components.

Description

Technical Field

[0001] The present invention belongs to the field of gas valves, and more specifically, relates to a gas automatic cut-off valve. Background Art

[0002] A cut-off valve is provided in a gas flow pipeline to control the flow of gas.

[0003] Generally, when there is a leakage in the pipeline and the flow rate suddenly increases, the cut-off valve closes the gas flow in the valve to prevent further gas leakage.

[0004] Existing cut-off valves are generally controlled by electrical components for on / off, with a complex structure and a large number of components, resulting in a relatively high manufacturing cost; while ordinary mechanical cut-off valves have a slow response speed and a low sealing degree inside the valve, and it is easy for the cooperation relationship of the sealing parts to be broken by high-pressure gas, leading to gas leakage problems. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a gas automatic cut-off valve, which can automatically close the valve when gas leaks and effectively ensure the valve sealing performance, and has a simple structure without the assistance of electrical components.

[0006] A gas automatic cut-off valve of the present invention includes:

[0007] A housing having a through cavity for gas passage;

[0008] A support ring fixedly located inside the housing and disposed near the gas outlet side; and

[0009] A reset core located inside the housing and disposed near the gas inlet side; the reset core is located inside the support ring and is made of an elastic material to have the ability to fit and abut against the inner wall of the support ring for sealing; a bowl-shaped groove is formed on the end face of the reset core facing the gas inlet direction to receive the gas pressure; the reset core and the support ring are connected by a bracket made of an elastic material, and the bracket provides an axial elastic force to enable the reset core to have the ability to maintain a distance from the support ring;

[0010] In the closed state, the outer wall of the reset core fits against the inner wall of the support ring to close the cavity; in the open state, the outer wall of the reset core maintains a distance from the inner wall of the support ring to open the cavity.

[0011] As a further improvement of the present invention, the reset core includes a bowl core, a bracket, and a bottom ring arranged in sequence; the bowl core is made of an elastic material and is bowl-shaped, and the inner wall of the support ring has the same contour as the outer side wall of the bowl core; the number of brackets is several, the brackets are made of an elastic material, and the brackets are connected between the bottom of the bowl of the bowl core and the inner wall of the bottom ring. In the open state, the brackets are in a free form, and in the closed state, the brackets are in a compressed state; the bottom ring is detachably connected to the lower end face of the support ring.

[0012] As a further improvement of the present invention, the rim of the bowl core is turned outwards all around, and the diameter of the large end opening of the ring mouth of the support ring is smaller than the outer diameter of the rim. In the closed state, the rim is placed and fitted on the upper end face of the support ring.

[0013] As a further improvement of the present invention, a ring groove is formed in the inner wall of the support ring; the bottom ring is embedded in the ring groove, and a plurality of limiting posts are fixedly arranged in the ring groove; during assembly, the limiting posts are located inside the bottom ring, and the limiting posts are in contact with the outer side of the bracket to limit the rotating pair of the reset core.

[0014] As a further improvement of the present invention, a plurality of limiting holes are formed in the bottom ring; the limiting holes are formed at the connection between the bracket and the bottom ring; during assembly, the limiting posts are embedded in the corresponding limiting holes.

[0015] As a further improvement of the present invention, the rim is made of an elastic material, and a connection module is fixedly connected to the outer edge of the rim; in the closed state, the connection module is detachably connected to the support ring directly or indirectly, so that the rim is subjected to a tensile force with at least a radial component force to offset the tensile force of the deformation of the bowl core caused by air pressure on the rim.

[0016] As a further improvement of the present invention, an inclined angle is provided at the outer edge of the upper end of the support ring, which is outward and towards the air outlet side; the rim has a flanging that bends outward and towards the air outlet side; the connection module is arranged at the outer edge of the flanging; in the closed state, the flanging abuts and fits against the inclined angle end face, and the flanging is in a compressed state to maintain a seal with the inclined angle.

[0017] As a further improvement of the present invention, a magnetic attraction module is arranged on the end face of the support ring close to the air inlet; the magnetic attraction module includes a repulsion ring, a connection ring, and an attraction ring that are sequentially connected along the axial direction and distributed in sequence according to the air outlet direction; a magnetic ring is fixedly connected to the outer edge of the flanging; the magnetic poles on the opposite sides of the repulsion ring and the magnetic ring are the same; the magnetic poles on the opposite sides of the attraction ring and the magnetic ring are opposite; the connection ring is made of a non-magnetic material; in the closed state, the magnetic ring is magnetically connected to the attraction ring, and the tensile force of the deformation of the bowl core caused by air pressure on the rim has at least a component force parallel to the magnetic force direction.

[0018] As a further improvement of the present invention, a slide rail is arranged on the end face of the support ring close to the air inlet; a chute is formed in the slide rail; a sliding ring is fixedly connected to the outer edge of the rim; during assembly, the sliding ring is embedded in the chute and is slidably connected to the chute.

[0019] As a further improvement of the present invention, a boss is fixedly provided on the end face of the bowl edge close to the support ring; a groove is provided on the end face of the boss close to the support ring; when the reset core moves toward the support ring side along the axial direction, the boss abuts against the support ring before the outer wall of the bowl core; when the end face of the support ring close to the air inlet abuts against the boss, the groove and the end face of the support ring form a closed air cavity; the boss is made of elastic material and is deformed after being directly or indirectly pressurized by the air pressure in the valve to reduce the volume of the air cavity.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. The present invention receives the atmosphere entering the air inlet through a reset core composed of a bowl core, a bracket, and a bottom ring. When the pipeline leaks, the gas flow rate increases instantly, and the gas entering the air inlet increases instantly, which will press the bowl core downward, and the bracket bends to reserve elastic potential energy. Due to the bowl-shaped structure of the bowl core, the air pressure received is more sensitive. When the bowl core moves down to fit and abut against the support ring, the air pressure continues to press the bowl core. The bowl core is made of elastic material, so that the bowl core and the support ring are elastically abutted to complete the sealing of the valve; as long as the air inlet continues to take in air, the valve will continue to be sealed, and the sealing degree is The degree of the valve increases with the increase of air pressure, which effectively ensures the sealing effect of the valve; compared with the existing cut-off valve, the structure is more responsive and effective, and is composed of mechanical structures, with low assembly and manufacturing difficulties; at the same time, since the bracket is made of elastic material, the bowl core will automatically reset after the leakage is solved to ensure the opening of the valve again. This process does not require manual intervention or electrical signal input. The reset energy is provided by the originally stored elastic potential energy, which is converted from the pressure of the air pressure on the reset core. The process is fully automatic, which makes users more worry-free and uses less energy;

[0022] 2. The air pressure increases instantly due to leakage, and the increased air pressure may instantly exceed the abutment strength between the bowl core and the support ring, causing the bowl core to deform and embed in the inner wall of the support ring, or even pass through the support ring after deformation and be located at the lower side of the support ring, causing the bowl core to be stuck by the ring mouth and unable to be lifted up and returned to its original position by the bracket for secondary use, and even causing the seal to fail and unable to cut off the gas flow. The present invention provides a connection module to enable the bowl core to be directly or indirectly connected to the support ring in a closed state. The connection strength of the connection offsets the tendency of the bowl edge to move inward and downward due to the deformation of the bowl core caused by the intake air, thereby avoiding the above-mentioned problems caused by excessive deformation of the bowl core;

[0023] 3. Specifically, the present invention sets the connection module as a magnetic ring, and a corresponding magnetic attraction module is arranged on the upper side of the support ring; in the open state, the magnetic ring and the repulsion ring are at the same height, and the bowl edge is bent and deformed, so that a gap is maintained between the magnetic ring and the magnetic attraction module to allow gas to pass through; in the closed state, the magnetic ring and the attraction ring are at the same height, and after the bowl edge is stretched, it fits and abuts against the upper end face of the support ring, and the magnetic force direction between the magnetic ring and the attraction ring is horizontal; when excessive pressure is applied to the bowl core, the downward stretching of the bowl core wall will force the bowl edge to stretch and deform, and the bowl edge will pull the magnetic ring and the attraction ring apart, but this pulling force has at least a horizontal component force, which is opposite to the magnetic force direction, making it difficult for the bowl core to be excessively deformed;

[0024] 4. Specifically, the present invention sets the connection module as a sliding ring located outside the bowl edge, and a slide rail is provided on the upper end face of the support ring. The sliding ring is embedded in the slide rail and is slidably connected to the slide rail; when excessive pressure is applied to the bowl core, the downward stretching of the bowl core wall will force the bowl edge to stretch and deform, but the setting of the sliding ring and the slide rail makes the bowl core not excessively deformed, and at the same time ensures that the bowl edge is always located above the support ring. When the air pressure is too high, the fit and abutment between the bowl edge and the upper end face of the support ring are more firm, improving the sealing performance;

[0025] 5. Specifically, the present invention sets the connection module as a convex platform located below the bowl edge. A groove is provided on the lower end face of the convex platform, which is similar to the structure of a suction cup; when the bowl core moves downward, the convex platform first abuts against the support ring, and the groove and the upper end face of the support ring form a closed air cavity. The bowl core will continue to move downward until the outer wall of the bowl core abuts against the inner wall of the support ring. At this time, the convex platform deforms, the volume of the air cavity becomes smaller, and the gas in the air cavity is discharged. After the bowl edge deforms and returns to its original position, the air pressure in the air cavity decreases, making the air pressure in the valve greater than the air pressure in the air cavity, forcing the bowl edge to be forcibly adsorbed on the upper end face of the support ring, avoiding the problem of excessive deformation of the bowl core; this design is mainly aimed at the situation where when repairing a leakage point in a pipeline, due to repairing cracks, the cracks will be flared, repaired, etc., and the size of the crack is variable, so the air pressure will be unstable;

[0026] 6. The present invention provides that the upper end face of the support ring is provided with a protruding peak section. In the closed state, the bowl edge adheres to the surface of the peak section, so that the connection between the bowl edge and the bowl core forms a protruding peak; when excessive pressure is applied to the bowl core, the downward stretching of the bowl core wall will force the bowl edge to stretch and deform. Since the deformation of the bowl edge exerts a pressure on the peak section of the support ring, and the supporting force feedback by the peak section will hinder the deformation of the bowl edge, effectively ensuring that the bowl core will not be excessively deformed. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a schematic three-dimensional sectional structure view of the first specific embodiment of the present invention;

[0028] Figure 2 is a schematic three-dimensional structure view of the reset core of the first specific embodiment of the present invention;

[0029] Figure 3 Schematic diagram of the three-dimensional sectional structure of the support ring in the first specific embodiment of the present invention;

[0030] Figure 4 Schematic diagram of the three-dimensional structure after the reset core and the support ring in the first specific embodiment of the present invention are assembled;

[0031] Figure 5 Schematic diagram of the planar structure in the open state in the first specific embodiment of the present invention;

[0032] Figure 6 Schematic diagram of the planar structure in the closed state in the first specific embodiment of the present invention;

[0033] Figure 7 Schematic diagram of the three-dimensional structure of the reset core in the second specific embodiment of the present invention;

[0034] Figure 8 Schematic diagram of the three-dimensional sectional structure after the reset core and the support ring in the second specific embodiment of the present invention are assembled;

[0035] Figure 9 Schematic diagram of the planar structure after the reset core and the support ring are assembled in the open state in the third specific embodiment of the present invention;

[0036] Figure 10 Schematic diagram of the planar structure after the reset core and the support ring are assembled in the closed state in the third specific embodiment of the present invention;

[0037] Figure 11 Schematic diagram of the position of the magnetic ring and the magnetic attraction module in the open state in the third specific embodiment of the present invention;

[0038] Figure 12 Schematic diagram of the position of the magnetic ring and the magnetic attraction module in the closed state in the third specific embodiment of the present invention;

[0039] Figure 13 Schematic diagram of the planar structure after the reset core and the support ring are assembled in the open state in the fourth specific embodiment of the present invention;

[0040] Figure 14 Schematic diagram of the planar structure after the reset core and the support ring are assembled in the closed state in the fourth specific embodiment of the present invention.

[0041] Explanation of the reference numerals in the figure:

[0042] Intake joint 1, reset core 2, bowl core 21, bowl edge 22, bracket 23, bottom ring 24, limit hole 25, sliding ring 26, magnetic ring 27, convex platform 28, support ring 3, ring opening 31, limit post 32, gasket 4, packing 5, outlet joint 6, magnetic attraction module 7, repulsion ring 71, connecting ring 72, attraction ring 73. Detailed implementation mode

[0043] Specific embodiment 1: Please refer to Figures 1-6 A gas automatic cut-off valve, comprising: a housing, a reset core 2, and a support ring 3. In this embodiment, the state where the cut-off valve is placed vertically is used as the basis for the direction terms. The upper opening of the valve is the air inlet, and the lower opening is the air outlet.

[0044] The housing is composed of an air inlet joint 1 and an air outlet joint 6. The air inlet joint 1 and the air outlet joint 6 are threadedly connected, and a sealing ring is provided at the connection to ensure tightness; a through chamber is provided in the housing for air passage; the structure of the housing is similar to that of an existing ordinary cut-off valve and will not be elaborated herein.

[0045] The support ring 3 is fixedly located in the chamber of the housing; a packing 5 is also provided in the housing as the material for placing the support ring 3, so that the support ring 3 can be stably placed in the housing. A gasket 4 is also provided between the support ring 3 and the packing 5 to increase the contact area between the support ring 3 and the packing 5, making the contact more stable; the ring opening 31 of the support ring 3 is in the shape of a funnel with a larger upper part and a smaller lower part. The upper end surface of the support ring 3 is a horizontal plane. The ring opening 31 is the only passage for the gas of this cut-off valve. A receiving ring groove is provided on the lower end surface of the support ring 3, and the receiving ring groove communicates with the ring opening 31. Two limiting columns 32 are fixedly provided on the upper wall of the receiving ring groove.

[0046] The reset core 2 is located in the chamber of the housing; the reset core 2 includes a bowl core 21, a bracket 23, and a bottom ring 24 that are sequentially distributed from top to bottom; the bowl core 21 is made of an elastic material, the bowl core 21 is bowl-shaped, the bowl mouth faces the air inlet side, and the inner wall of the support ring 3 has the same contour as the outer side wall of the bowl core 21, so that the inner wall of the support ring 3 and the outer side wall of the bowl core 21 are in sealing contact after abutting in the closed state; the number of brackets 23 is three, and the three brackets 23 are evenly distributed at the bottom of the bowl of the bowl core 21. The brackets 23 are all made of elastic materials. The brackets 23 are connected between the bottom of the bowl of the bowl core 21 and the inner wall of the bottom ring 24. The brackets 23 present an L-shaped structure in the free state. When the brackets 23 are compressed and bent, they always provide an axial elastic force to the bowl core 21. In the open state, the brackets 23 are in the free form, and there is a gap between the outer side wall of the bowl core 21 and the inner side wall of the support ring 3. The upper end surface of the bowl core 21 is higher than the upper end surface of the support ring 3. In the closed state, the brackets 23 are in a compressed state; the bottom ring 24 is detachably connected to the lower end surface of the support ring 3. Specifically, the bottom ring 24 is placed in the receiving ring groove. Due to the presence of the gasket 4, the bottom ring 24 has axial limitation after being placed in the receiving ring groove. After being assembled, the limiting post 32 is located inside the bottom ring 24 and abuts against the outer side surface of the bracket 23 to limit the rotation of the reset core 2. Six limiting holes 25 can also be opened on the bottom ring 24. Every two limiting holes 25 form a group. The two limiting holes 25 in each group are respectively opened at the connection between the bracket 23 and the bottom ring 24. During assembly, the limiting post 32 is embedded in the corresponding limiting hole 25; in addition, the edge of the bowl mouth of the bowl core 21 is a bowl rim 22. The bowl rim 22 and the bowl core 21 are integrally formed and are both made of elastic materials. The bowl rim 22 turns outwards all around. In this embodiment, the lower end surface of the bowl rim 22 is a horizontal plane. The diameter of the large end opening of the ring mouth 31 of the support ring 3 is smaller than the outer diameter of the bowl rim 22, so that in the closed state, the bowl rim 22 is placed and abutted against the upper end surface of the support ring 3. The bowl rim 22 and the upper end surface of the support ring 3 can be elastically abutted to form a seal. The outer diameter of the bowl rim 22 is smaller than the inner diameter of the inner wall of the chamber whose height is the height of the chamber where it is located, so that there is a gap between the bowl rim 22 and the inner wall of the chamber, allowing gas to enter the ring mouth 31 through this gap and then discharge to the air outlet in the open state.

[0047] As a further improvement of the present invention, the outer edge of the upper end of the support ring 3 is provided with an oblique angle that faces outwards and towards the air outlet side; the bowl rim 22 has a flanging that turns outwards and towards the air outlet side; the connection module is arranged at the outer edge of the flanging; in the closed state, the flanging abuts and fits against the end surface of the oblique angle, and the flanging is in a compressed state to maintain a seal with the oblique angle.

[0048] Specific Embodiment Two: On the basis of Specific Embodiment One, please refer to Figures 7-8A gas automatic cut-off valve, at the outer edge of the upper end surface of the support ring 3, there is a slide rail, the slide rail is annular, and a circle of vertically arranged chutes are opened in the slide rail; in addition to the chutes, there are also embedded grooves, the number of embedded grooves is multiple, and they are evenly opened on the inner side of the slide rail and communicate with the chutes, and the opening direction of the embedded grooves is also in the vertical direction. The slide rail can be placed on the upper side of the support ring 3 and is stuck in the chamber through size design, which is relatively easy to achieve.

[0049] At the outer edge of the bowl rim 22, there is a sliding ring 26; the sliding ring 26 is fixedly connected to the bowl rim 22 through a connecting piece, and the width of the sliding ring 26 matches the diameter of the chute, so that during assembly, the sliding ring 26 is embedded in the chute and is slidably connected to the chute, and the connecting piece is located in the embedded groove; when the bowl core 21 is pressed down by gas, the sliding ring 26 slides vertically up and down in the chute, and the connecting piece slides vertically up and down in the embedded groove; if the air pressure received by the bowl core 21 is too large instantaneously, the bowl core 21 has a tendency to shrink excessively into the ring opening 31. At this time, due to the cooperation relationship between the sliding ring 26 and the chute, it will prevent the bowl core 21 from deforming excessively, ensure that the bowl rim 22 is always located above the ring opening 31, ensure that the sealing relationship between the bowl rim 22 and the support ring 3 always exists, and also ensure that after the air pressure returns to normal, the bracket 23 can return to its normal position to make the bowl core 21 move upward to keep a gap with the support ring 3.

[0050] In this embodiment, the upper end surface of the support ring 3 is not a horizontal plane, but a peak section surface with an inclined angle, specifically referring to Figure 8 shown in; correspondingly, the bowl rim 22 itself is also a bent flanging to match the upper end surface of the support ring 3; when the bowl core 21 is subjected to excessive pressure, the downward stretching of the wall of the bowl core 21 will force the bowl rim 22 to stretch and deform. Since the deformation of the bowl rim 22 exerts pressure on the peak section of the support ring 3, and the supporting force feedback from the peak section will hinder the deformation of the bowl rim 22. In addition, the bowl rim 22 is similar to being hung on the support ring 3. Such a design can effectively ensure that the bowl core 21 will not deform excessively; the design of the upper end surface of the support ring 3 and the bending of the bowl rim 22 here is an improvement to the solution of this embodiment, and a structure with a flat design can also be used simply.

[0051] Specific Embodiment Three: On the basis of Specific Embodiment One, please refer to Figures 9-12 A gas automatic cut-off valve, on the upper end surface of the support ring 3, there is a magnetic attraction module 7; the magnetic attraction module 7 includes a repulsion ring 71, a connecting ring 72, and an attraction ring 73 that are sequentially connected from top to bottom in the vertical direction; except for different materials, the repulsion ring 71, the connecting ring 72, and the attraction ring 73 have the same size and structure.

[0052] The outer edge of the bowl rim 22 is fixedly connected with a magnetic ring 27; the magnetic ring 27 is at least made of a magnetic material, so that the outer side surface of the magnetic ring 27 has magnetism.

[0053] The repulsion ring 71 is made of at least a magnetic material, such that the side of the repulsion ring 71 opposite to the magnetic ring 27 has magnetism and the same magnetism as the magnetic ring 27;

[0054] The attraction ring 73 is made of at least a magnetic material, such that the side of the attraction ring 73 opposite to the magnetic ring 27 has magnetism and the opposite magnetism to the magnetic ring 27;

[0055] The connecting ring 72 is made of a non-magnetic conductive material;

[0056] In the open state, the magnetic ring 27 is at the height where the repulsion ring 71 is located. At this time, the magnetic ring 27 is repelled and there is a gap between the magnetic ring 27 and the repulsion ring 71 to allow gas to flow through, and the bowl edge 22 is compressed and bent deforming;

[0057] In the moving state, the magnetic ring 27 is at the height where the connecting ring 72 is located. At this time, the magnetic ring 27 is not affected by the magnetic force, the bowl edge 22 returns to the free state, the magnetic ring 27 is also in the free state, and there is a gap between the outer side of the magnetic ring 27 and the connecting ring 72 to allow gas to flow through;

[0058] In the closed state, the magnetic ring 27 is at the height where the attraction ring 73 is located. At this time, the magnetic ring 27 is attracted and abuts against the attraction ring 73, and the bowl edge 22 is stretched deforming and abuts against the upper end face of the support ring 3. It should be noted that the magnetic force direction between the magnetic ring 27 and the attraction ring 73 is horizontal. When the bowl core 21 is subjected to excessive pressure, the wall of the bowl core 21 is stretched downward, which will force the bowl edge 22 to stretch deforming. The pulling force of the bowl edge 22 pulling the magnetic ring 27 is horizontal. To separate the two magnetic blocks, it is relatively difficult to pull along the magnetic force direction, and the magnetic force will offset part of the pulling force. During leakage repair, when the bowl core 21 returns to its position, since the bowl core 21 is separated from the support ring 3, the elastic jacking force provided by the support 23 is axial. Therefore, the bowl core 21 drives the bowl edge 22 to pull the magnetic ring 27 with at least a vertically upward component force. To separate the two magnetic blocks, it is relatively easy to pull perpendicular to the magnetic force direction. Therefore, this design has the ability of secondary use.

[0059] In this embodiment, the upper end face of the support ring 3 is not a horizontal plane, but a peak section surface with an inclined angle. For specific reference, see Figure 9 shown in; correspondingly, the bowl edge 22 itself is also a curved flanging to match the upper end face of the support ring 3; when the bowl core 21 is subjected to excessive pressure, the wall of the bowl core 21 is stretched downward, which will force the bowl edge 22 to stretch deforming. Since the deformation of the bowl edge 22 has a pressure on the peak section of the support ring 3, and the supporting force feedback from the peak section will hinder the deformation of the bowl edge 22. In addition, the bowl edge 22 is similar to being hung on the support ring 3. Such a design can effectively ensure that the bowl core 21 will not be excessively deformed; the design of the upper end face of the support ring 3 and the bending of the bowl edge 22 here is an improvement to the solution of this embodiment, and a structure with a flat surface design can also be simply used.

[0060] Specific Embodiment 4: On the basis of Specific Embodiment 1, please refer to Figures 13-14 a gas automatic cut-off valve, a boss 28 is fixedly arranged on the end face of the bowl edge 22 close to the support ring 3; a groove is formed on the end face of the boss 28 close to the support ring 3; when the reset core 2 moves towards the support ring 3 side along the axial direction, the boss 28 abuts against the support ring 3 before the outer wall of the bowl core 21; when the end face of the support ring 3 close to the air inlet abuts against the boss 28, the groove and the end face of the support ring 3 form a closed air cavity; the boss 28 is made of an elastic material and deforms under the direct or indirect pressure of the gas pressure in the valve, so that the volume of the air cavity decreases.

[0061] After the bowl core 21 moves downward, the boss 28 abuts against the support ring 3 first, and the groove and the upper end face of the support ring 3 form a closed air cavity. The bowl core 21 will continue to move downward until the outer wall of the bowl core 21 abuts against the inner wall of the support ring 3. At this time, the boss 28 deforms, the volume of the air cavity becomes smaller, the gas in the air cavity is discharged, and after the bowl edge 22 deforms and returns to its original position, the gas pressure in the air cavity decreases, making the gas pressure in the valve greater than the gas pressure in the air cavity, forcing the bowl edge 22 to be forcibly adsorbed on the upper end face of the support ring 3, avoiding the problem of excessive deformation of the bowl core 21; this design is mainly for use when repairing pipeline leaks. When repairing cracks, the cracks will be flared, repaired, etc., and the size of the crack is dynamically changing. When the crack goes through the process of shrinking - expanding, the boss 28 will elastically return due to the change in gas pressure, then the gas pressure in the air cavity will decrease, and the situation of being forcibly adsorbed on the upper end face of the support ring 3 will occur.

[0062] Specific Embodiment 5: On the basis of any one of Specific Embodiments 1 to 4, the materials of the air inlet joint 1 and the air outlet joint 6 are Hpb62 - 2; the material of the reset core 2 is chlorinated polyethylene rubber; the material of the support ring 3 is PPS; the material of the gasket 4 is aluminum - magnesium alloy; the material of the packing is rubber.

Claims

1. An automatic gas cut-off valve, characterized in that: including a housing having a through chamber for ventilation; a support ring (3) fixedly located inside the housing and disposed near the air outlet side; and a reset core (2) located inside the housing and disposed near the air inlet side; the reset core (2) is located inside the support ring (3), and the reset core (2) is made of an elastic material to have the ability to fit and abut against the inner wall of the support ring (3) for sealing; a bowl-shaped groove is formed on the end face of the reset core (2) facing the incoming air direction to receive the incoming air pressure; the reset core (2) and the support ring (3) are connected by a bracket (23) made of an elastic material, and the bracket (23) provides an axial elastic force to enable the reset core (2) to have the ability to maintain a distance from the support ring (3); in the closed state, the outer wall of the reset core (2) fits against the inner wall of the support ring (3) to close the chamber; in the open state, the outer wall of the reset core (2) maintains a distance from the inner wall of the support ring (3) to open the chamber; the reset core (2) includes a bowl core (21), a bracket (23), and a bottom ring (24) distributed in sequence; the bowl core (21) is bowl-shaped, and the inner wall of the support ring (3) has the same contour as the outer side wall of the bowl core (21); the number of brackets (23) is several, and the brackets (23) are connected between the bottom of the bowl of the bowl core (21) and the inner wall of the bottom ring (24). In the open state, the brackets (23) are in a free form, and in the closed state, the brackets (23) are in a compressed state; the bottom ring (24) is detachably connected to the lower end face of the support ring (3); the rim (22) of the bowl core (21) is turned outwards all around, and the diameter of the large-end opening of the ring mouth (31) of the support ring (3) is smaller than the outer diameter of the rim (22). In the closed state, the rim (22) rests and fits on the upper end face of the support ring (3).

2. The gas automatic cut-off valve according to claim 1, wherein: the bowl core (21) is made of an elastic material, and the bracket (23) is made of an elastic material.

3. The gas automatic cut-off valve according to claim 2, characterized in that: a ring groove is formed on the inner wall of the support ring (3); the bottom ring (24) is embedded in the ring groove, and several limit posts (32) are fixedly arranged in the ring groove; during assembly, the limit posts (32) are located inside the bottom ring (24), and the limit posts (32) abut against the outer side of the bracket (23) to limit the rotational pair of the reset core (2).

4. The gas automatic cut-off valve according to claim 3, wherein: several limit holes (25) are formed in the bottom ring (24); the limit holes (25) are formed at the connection between the bracket (23) and the bottom ring (24); during assembly, the limit posts (32) are embedded in the corresponding limit holes (25).

5. The gas automatic cut-off valve according to claim 1, characterized in that: the rim (22) is made of an elastic material, and a connection module is fixedly connected to the outer edge of the rim (22); in the closed state, the connection module is directly or indirectly detachably connected to the support ring (3) so that the rim (22) is subjected to a tensile force having at least a radial component force to offset the tensile force of the deformation of the bowl core (21) caused by air pressure on the rim (22).

6. The gas automatic cut-off valve according to claim 5, wherein: an outward and air outlet side inclined angle is provided at the outer edge of the upper end of the support ring (3); the rim (22) has a turned edge that bends outwards and towards the air outlet side; the connection module is arranged at the outer edge of the turned edge; in the closed state, the turned edge abuts and fits against the inclined angle end face, and the turned edge is in a compressed state to maintain sealing with the inclined angle.

7. The gas automatic cut-off valve according to claim 5, characterized in that: A magnetic attraction module (7) is provided on the end face of the support ring (3) close to the air inlet side; the magnetic attraction module (7) includes a repulsion ring (71), a connection ring (72), and an attraction ring (73) that are sequentially connected in the axial direction and sequentially distributed in the air outlet direction; the bowl edge (22) has a flanging that bends outward and toward the air outlet; a magnetic ring (27) is fixedly connected to the outer edge of the flanging; the magnetic sides of the repulsion ring (71) and the magnetic ring (27) are the same; the magnetic sides of the attraction ring (73) and the magnetic ring (27) are opposite; the connection ring (72) is made of a non-magnetic conductive material; in the closed state, the magnetic ring (27) is magnetically connected to the attraction ring (73), and the tensile force of the bowl core (21) caused by the deformation due to air pressure on the bowl edge (22) has at least a component force parallel to the magnetic force direction.

8. The gas automatic cut-off valve according to claim 5, characterized in that: A slide rail is provided on the end face of the support ring (3) close to the air inlet; a chute is provided in the slide rail; a slide ring (26) is fixedly connected to the outer edge of the bowl edge (22); during assembly, the slide ring (26) is embedded in the chute and is slidably connected to the chute.

9. The gas automatic cut-off valve according to claim 5, wherein: A boss (28) is fixedly provided on the end face of the bowl edge (22) close to the support ring (3); a groove is provided on the end face of the boss (28) close to the support ring (3); when the reset core (2) moves toward the support ring (3) side in the axial direction, the boss (28) abuts against the support ring (3) earlier than the outer wall of the bowl core (21); when the end face of the support ring (3) close to the air inlet abuts against the boss (28), the groove and the end face of the support ring (3) form a closed air cavity; the boss (28) is made of an elastic material and deforms after being directly or indirectly pressured by the air pressure in the valve, so that the volume of the air cavity decreases.

Images