Gas self-closing valve

Abstract

The utility model provides a gas self-closing valve, and belongs to the technical field of gas. The problems that the length is large and the size is large while the installation convenience of the gas pipeline is improved are solved. The gas self-closing valve comprises a valve body, the front end and the rear end of the valve body are a gas inlet end and a gas outlet end respectively, a flow limiting core is arranged in the gas inlet end, a connector is in threaded connection with an end opening of the gas inlet end, the front end of the connector extends out of the gas inlet end, a loose joint cap is sleeved outside the front end of the connector, the flow limiting core is located in the connector, and an annular blocking shoulder is arranged on the inner side of the rear end of the connector. An annular blocking piece is detachably connected to the position, close to the front end, in the connector, the front end of the current limiting core abuts against the blocking piece, and the rear end of the current limiting core abuts against the annular blocking shoulder. The utility model has the advantages of convenient connection with the gas pipeline, shorter length, high convenience in replacement of the flow-limiting core, and the like.

Description

Technical Field

[0001] The utility model belongs to the technical field of fuel gas and relates to a fuel gas self-closing valve. Background Art

[0002] In order to ensure the safety of gas use, a gas self-closing valve is installed in front of the gas appliance, which can automatically close in case of overpressure or underpressure to prevent gas leakage. For example, the gas self-closing valve disclosed in patent application No. 202221580187.3 includes a valve body, a valve stem, a valve cover and a diaphragm. The valve body has an air inlet and an air outlet that are connected. The top of the valve body is fixedly connected to the valve cover and a diaphragm is clamped therebetween. The inner end of the valve stem passes through the diaphragm and is fixedly connected to the diaphragm. The outer end of the valve stem extends out of the valve cover and is fixedly connected to a lifting button. A guide seat is fixedly provided in the valve body. The guide seat has an air passage connecting the air inlet and the air outlet. An iron sheet located between the guide seat and the diaphragm is also fixedly provided in the valve body. The iron sheet has a number of air holes. A moving block that moves up and down relative to the guide seat is provided in the guide seat. The moving block An iron sheet extends out from the upper part and a magnet is fixedly connected to the top of the moving block. The lower part of the moving block is two symmetrical block-shaped parts. The valve body has a circle of radially inwardly convex retaining ring at the inner end of the air inlet. A sheet-shaped pull rod penetrates the air channel and is located between the two block-shaped parts. The outer end of the pull rod extending out of the retaining ring is fixedly connected to a sealing gasket. There are connecting rods on both sides of the pull rod. Both block-shaped parts have inclined sliding grooves for corresponding connecting rods to pass through. When the moving block moves up, the connecting rod moves along the sliding groove to make the sealing gasket at the outer end of the pull rod move away from the retaining ring. When the moving block moves down and when the magnet is adsorbed on the iron sheet, the connecting rod moves along the sliding groove to make the sealing gasket at the outer end of the pull rod seal to the retaining ring.

[0003] When in use, manually press the lifting button to make the valve stem drop, the inner end of the valve stem attracts the magnet, then pull the lifting button, the valve stem drives the moving block to rise vertically, the connecting rod moves along the slide slot, so that the sealing gasket is away from the retaining ring, the gas at the air inlet passes through the retaining ring, the gas passage, and the gas hole, and the gas acts on the diaphragm from the initial stage of the air outlet; when underpressure occurs, the deadweight of the moving block and the adsorption force between the magnet and the iron sheet make the moving block drop vertically, the connecting rod moves along the slide slot so that the sealing gasket is sealed to the retaining ring, and the underpressure closure is realized; when overpressure occurs, the diaphragm is impacted by the gas and bulges upward, the magnet is separated from the valve stem, the moving block drops vertically, and the connecting rod moves along the slide slot so that the sealing gasket is sealed to the retaining ring, and the overpressure closure is realized. In addition, a limited flow valve core is also arranged in the air inlet, which can limit the maximum flow of the gas, that is, it can be automatically closed when the flow is excessive.

[0004] The gas self-closing valve is connected to the gas pipeline through threads at both ends. In practice, the gas self-closing valve is generally located in a cabinet. The internal space of the cabinet is relatively narrow and the threads need to be aligned when connected, which makes it very inconvenient to install. For this reason, it is easy to think of directly connecting a flexible joint to the air inlet end of the gas self-closing valve (such as the movable double-sealed gas self-closing valve disclosed in patent application number 202122528894.X) to improve the convenience of installation, but this will cause the entire gas self-closing valve to be longer and larger in size. Utility Model Content

[0005] The utility model aims to solve the above problems existing in the prior art and proposes a gas self-closing valve, which solves the problems of long length and large volume while improving the convenience of installation with the gas pipeline.

[0006] The purpose of the utility model can be achieved through the following technical solutions:

[0007] A gas self-closing valve comprises a valve body with front and rear ends serving as an air inlet end and an air outlet end respectively, a flow-limiting core being arranged in the air inlet end, a joint being threadedly connected to the port of the air inlet end, a front end of the joint extending out of the air inlet end and a flex cap being connected to the front end outer sleeve of the joint, and characterized in that the flow-limiting core is arranged in the joint, an annular shoulder is provided on the inner side of the rear end of the joint, an annular blocking member is detachably connected near the front end of the joint, the front end of the flow-limiting core abuts against the blocking member, and the rear end of the flow-limiting core abuts against the annular shoulder.

[0008] Similar to the existing ones, the air inlet end of the gas self-closing valve can be flexibly connected to the gas pipeline through the setting of the joint and the union cap, thereby improving the convenience of installation with the gas pipeline. At the same time, the gas self-closing valve directly sets the flow-limiting core in the joint, and then sets an annular shoulder on the inner side of the rear end of the joint and detachably connects the annular blocking member in the joint. The front end of the flow-limiting core abuts against the blocking member and the rear end abuts against the annular shoulder, thereby limiting the position of the flow-limiting core in the joint. Through the above-mentioned setting, the flow-limiting core can be directly integrated into the joint, and the internal space of the joint is reasonably utilized, because the part where the flow-limiting core needs to be installed is omitted in the air inlet end of the valve body, thereby shortening the length of the valve body while realizing the flexibly connected function.

[0009] In addition, the blocking member is detachably connected to the joint near the front end. The user only needs to remove the blocking member from the joint, and then the current limiting core can be taken out of the joint directly from the front end of the joint and replaced. This means that the joint does not need to be disassembled when replacing the current limiting core. Therefore, the gas self-closing valve also greatly improves the convenience of replacing the current limiting core.

[0010] In the above-mentioned gas self-closing valve, an annular groove is provided in the joint, and the blocking member is a retaining spring provided in the annular groove.

[0011] In actual operation, it is only necessary to take out the circlip from the annular groove with circlip pliers, and then the current limiting core can be directly taken out from the front port of the inner diameter of the joint.

[0012] In the above-mentioned gas self-closing valve, as another technical solution, the blocking member is a blocking ring threadedly connected to the joint.

[0013] In actual operation, the retaining ring only needs to be unscrewed from the connector, and the current limiting core can be directly taken out from the connector through the front port.

[0014] In the above-mentioned gas self-closing valve, a connecting hole and an assembly hole are sequentially provided in the front-to-back direction in the joint, the connecting hole is a hexagonal hole, the assembly hole is a round hole, the blocking member and the current limiting core are both located in the assembly hole, and the aperture of the assembly hole is less than or equal to the radius of the inscribed circle of the connecting hole.

[0015] The connecting hole is a hexagonal hole used to cooperate with a hexagonal tool to facilitate the installation of the joint. The diameter of the assembly hole is less than or equal to the inscribed circle radius of the connecting hole, which means that the hole wall of the connecting hole will not hinder the removal of the blocking member and the removal of the current limiting core.

[0016] In the above-mentioned gas self-closing valve, the current limiting core includes a cylindrical shell with openings at both ends, an annular abutment seat threadedly connected to the rear end of the shell, and a sealing body slidably connected to the shell in the front and rear directions. An annular guide part 1 is provided on the inner side of the front end of the shell, and the outer wall of the annular guide part 1 is fixedly connected to the inner wall of the front end of the shell through a plurality of first legs. An annular guide part 2 is provided in the annular abutment seat, and the outer wall of the annular guide part 2 is fixedly connected to the inner wall of the annular abutment seat through a plurality of second legs. The sealing body includes a guide column and a circular sealing sheet fixedly connected to the outer side of the middle part of the guide column, the circular sealing sheet is located between the annular guide part 1 and the annular guide part 2, the outer diameter of the circular sealing sheet is smaller than the inner diameter of the shell, and the outer diameter of the circular sealing sheet is larger than the inner diameter of the annular abutment seat, the front end of the guide column is matched with the inner hole guide of the annular guide part 1, and the rear end of the guide column is matched with the inner hole guide of the annular guide part 2. A support spring is provided on the outer sleeve of the guide column, and the two ends of the support spring are respectively abutted against the circular sealing sheet and each second leg, and when the circular sealing sheet abuts against the annular guide part 1, the front end of the guide column is located in the connecting hole.

[0017] When not in use, the sealing body is in a position where the circular sealing piece and the annular guide part abut against each other under the action of the support spring. Since the outer diameter of the circular sealing piece is smaller than the inner diameter of the shell, a gap is formed between the two for the gas to pass through. During normal air intake, the gas pressure acts on the circular sealing piece and causes the sealing body to overcome the action of the support spring and move backward. The gas pressure of normal flow is not greater than the elastic force of the support spring. When the gas exceeds the set flow, the circular sealing piece of the sealing body abuts against the front end surface of the annular abutment seat, so that the gas cannot pass through the inner hole of the annular abutment seat and the over-flow is cut off.

[0018] Since the front end of the guide column is located in the connection hole when the circular sealing sheet and the annular guide portion abut against each other, a position is provided for the user to remove the current limiting core from the connector. After the blocking member is removed from the connector, the current limiting core can be directly pulled out of the connector by clamping the front end of the guide column with tweezers.

[0019] Compared with the prior art, the gas self-closing valve has the following advantages:

[0020] 1. By directly arranging the current limiting core in the joint, and then arranging an annular stopper on the inner side of the rear end of the joint and detachably connecting an annular stopper in the joint, the front end of the current limiting core abuts against the stopper and the rear end abuts against the annular stopper, so that the position of the current limiting core in the joint is limited, so that the current limiting core can be directly integrated into the joint, and the internal space of the joint is reasonably used, so that the part of the inlet end of the valve body where the current limiting core needs to be installed can be omitted, thereby achieving the live connection function while shortening the length of the valve body;

[0021] 2. The blocking piece is detachably connected to the joint near the front end. The user only needs to remove the blocking piece from the joint, and then the current limiting core can be directly taken out from the front end of the joint and replaced. In this way, there is no need to disassemble the joint when replacing the current limiting core, which greatly improves the convenience of replacing the current limiting core. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a three-dimensional schematic diagram of the gas self-closing valve.

[0023] Figure 2 It is a cross-sectional view of the gas self-closing valve.

[0024] Figure 3 yes Figure 2 A partial enlarged view of the middle joint.

[0025] Figure 4 It is a three-dimensional schematic diagram of the joint.

[0026] Figure 5 It is a three-dimensional schematic diagram of the limiting core.

[0027] Figure 6 It is a three-dimensional schematic diagram of the limiting core from another angle.

[0028] In the figure, 1, valve body; 1a, air inlet end; 1b, air outlet end; 1c, air hole; 2, flow limiting core; 2a, shell; 2a1, annular guide part 1; 2a2, first support leg; 2b, annular abutment seat; 2b1, annular guide part 2; 2b2, second support leg; 2c, sealing body; 2c1, guide column; 2c2, circular sealing sheet; 2d, supporting spring; 3, valve stem; 4, diaphragm; 5, air cavity; 6, lifting button; 7, movable rod; 8, driving block; 9, sealing gasket; 10, magnet; 11, joint; 11a, annular convex edge; 11b, annular shoulder; 11c, annular groove; 11d, connecting hole; 11e, assembly hole; 12, joint cap; 12a, annular shoulder; 13, blocking member. DETAILED DESCRIPTION

[0029] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0030] Embodiment 1

[0031] like Figure 1 and Figure 2 As shown, the gas self-closing valve comprises a valve body 1 with front and rear ends being respectively an inlet end 1a and an outlet end 1b, and a flow limiting core 2 is arranged in the inlet end 1a. A valve stem 3 is arranged in the valve body 1 along the vertical direction, a diaphragm 4 is fixedly connected to the lower end of the valve stem 3, the edge of the diaphragm 4 is fixedly connected to the valve body 1, an air passage cavity 5 is formed between the lower side of the diaphragm 4 and the inner wall of the valve body 1, and a lifting button 6 is fixedly connected to the upper end of the valve stem 3 extending out of the valve body 1. A movable rod 7 is arranged in the air passage cavity 5 along the front-back direction and a driving block 8 is slidably arranged in the vertical direction, the rear end of the movable rod 7 passes through the driving block 8 and a guide structure is arranged between the two, which can drive the movable rod 7 to move horizontally when the driving block 8 moves up and down, wherein the guide structure comprises a guide groove arranged on the side of the driving block 8 and a guide head located on the side of the movable rod 7, the upper end of the guide groove is tilted backward relative to the lower end, and the guide head is located in the guide groove. The interior of the outlet end 1b is connected to the air cavity 5, and the valve body 1 has an air hole 1c that connects the interior of the inlet end 1a to the air cavity 5. The front end of the movable rod 7 extends into the inlet end 1a through the air hole 1c. The front end of the movable rod 7 is fixedly connected to a sealing gasket 9. The movable rod 7 moves backward to make the sealing gasket 9 abut against the front end of the air hole 1c to close it. A magnet 10 is fixedly connected to the driving block 8, and the valve stem 3 is made of metal material and can be attracted by the magnetic force of the magnet 10.

[0032] When the gas self-closing valve is in the closed state, the driving block 8 is in the low position and the lower end of the valve stem 3 is adsorbed together with the magnet 10. At this time, the sealing gasket 9 at the front end of the movable rod 7 abuts against the front end opening of the gas hole 1c to close it. When the gas source at the front end is supplied, the lifting button 6 is manually lifted and the driving block 8 is lifted by the magnetic force of the magnet 10. The driving block 8 drives the movable rod 7 to drive the sealing gasket 9 to move forward under the action of the guide structure. The sealing gasket 9 is separated from the front end opening of the gas hole 1c and the gas hole 1c is opened. The gas enters the gas cavity 5 through the gas hole 1c and acts on the diaphragm 4, so that the valve stem 3 remains lifted upward and the gas hole 1c remains open.

[0033] Furthermore, if Figure 2 and Figure 3 As shown, the port of the air inlet end 1a is connected to a joint 11 through internal threads, a sealing ring is provided between the joint 11 and the inner wall of the air inlet end 1a, the front end of the joint 11 extends out of the air inlet end 1a and a union cap 12 is connected to the front end of the joint 11. The front end of the joint 11 has an annular convex edge 11a on the outside, and the rear end of the union cap 12 has an annular convex shoulder 12a on the inside, which is located behind the annular convex edge 11a. The union cap 12 will not fall off the joint 11 because the annular convex shoulder 12a cooperates with the annular convex edge 11a. The current limiting core 2 is located in the joint 11, and the rear end of the joint 11 has an annular stopper 11b on the inside, and a ring-shaped blocking member 13 is detachably connected near the front end of the joint 11, the front end of the current limiting core 2 abuts against the blocking member 13, and the rear end of the current limiting core 2 abuts against the annular stopper 11b.

[0034] The provision of the joint 11 and the union cap 12 enables the inlet end 1a of the gas self-closing valve to be flexibly connected to the gas pipeline, thereby improving the convenience of installation with the gas pipeline. At the same time, the gas self-closing valve directly sets the flow-limiting core 2 in the joint 11, and then sets an annular shoulder 11b on the inner side of the rear end of the joint 11 and detachably connects the annular blocking member 13 in the joint 11. The front end of the flow-limiting core 2 abuts against the blocking member 13 and the rear end abuts against the annular shoulder 11b, thereby limiting the position of the flow-limiting core 2 in the joint 11. Through the above-mentioned provision, the flow-limiting core 2 can be directly integrated into the joint 11, and the internal space of the joint 11 is reasonably utilized, because the part where the flow-limiting core 2 needs to be installed is omitted in the inlet end 1a of the valve body 1, thereby shortening the length of the valve body 1 while achieving the flexibly connected function.

[0035] In addition, the blocking member 13 is detachably connected to the connector 11 near the front end. The user only needs to remove the blocking member 13 from the connector 11 to directly take out the current limiting core 2 from the front end of the connector 11 and replace it. This means that the connector 11 does not need to be disassembled when replacing the current limiting core 2. Therefore, the gas self-closing valve also greatly improves the convenience of replacing the current limiting core 2.

[0036] Specifically, Figure 3 and Figure 4 As shown, the connector 11 is provided with an annular groove 11c, and the blocking member 13 is a spring disposed in the annular groove 11c. The connector 11 is provided with a connecting hole 11d and an assembly hole 11e in the front-to-back direction. The connecting hole 11d is a hexagonal hole, and the assembly hole 11e is a circular hole. The assembly hole 11e is concentric with the connecting hole 11d. The blocking member 13 and the current limiting core 2 are both located in the assembly hole 11e, and the diameter of the assembly hole 11e is less than or equal to the radius of the inscribed circle of the connecting hole 11d.

[0037] In this embodiment, if Figure 3 , Figure 5 and Figure 6 As shown, the current limiting core 2 includes a cylindrical shell 2a with openings at both ends, an annular abutment seat 2b threadedly connected to the rear end of the shell 2a, and a sealing body 2c slidably connected to the shell 2a in the front-to-back direction. An annular guide part 1 2a1 is provided on the inner side of the front end of the shell 2a, and the outer wall of the annular guide part 1 2a1 is fixedly connected to the inner wall of the front end of the shell 2a through a plurality of first legs 2a2. An annular guide part 2b1 is provided inside the annular abutment seat 2b, and the outer wall of the annular guide part 2b1 is fixedly connected to the inner wall of the annular abutment seat 2b through a plurality of second legs 2b2. The sealing body 2c includes a guide column 2c1 and a circular sealing sheet 2c2 fixedly connected to the outer side of the middle part of the guide column 2c1. The circular sealing sheet 2c2 is located between the annular guide part 1 2a1 and the annular guide part 2b1. The outer diameter of the circular sealing sheet 2c2 is smaller than the inner diameter of the shell 2a, and the outer diameter of the circular sealing sheet 2c2 is larger than the inner diameter of the annular abutment seat 2b. The guide column 2c The front end of the guide column 1 cooperates with the inner hole guide of the annular guide part 1 2a1, and the rear end of the guide column 2c1 cooperates with the inner hole guide of the annular guide part 2b1. A support spring 2d is provided on the outer sleeve of the guide column 2c1. The two ends of the support spring 2d respectively abut against the circular sealing sheet 2c2 and each second support leg 2b2. When the circular sealing sheet 2c2 abuts against the annular guide part 1 2a1, the front end of the guide column 2c1 is located in the connecting hole 11d.

[0038] When not in use, the sealing body 2c is in a position where the circular sealing piece 2c2 abuts against the annular guide part 2a1 under the action of the support spring 2d. Since the outer diameter of the circular sealing piece 2c2 is smaller than the inner diameter of the outer shell 2a, a gap is formed between the two for the gas to pass through. During normal air intake, the gas pressure acts on the circular sealing piece 2c2 and causes the sealing body 2c to overcome the action of the support spring 2d and move backward. The gas pressure of the normal flow is not greater than the elastic force of the support spring 2d. When the gas exceeds the set flow, the circular sealing piece 2c2 of the sealing body 2c abuts against the front end face of the annular abutment seat 2b, so that the gas cannot pass through the inner hole of the annular abutment seat 2b and the over-current cut-off is achieved.

[0039] Since the front end of the guide column 2c1 is located in the connection hole 11d when the circular sealing sheet 2c2 abuts against the annular guide portion 2a1, a position is provided for the user to take out the current limiting core 2 from the connector 11. After the blocking member 13 is removed from the connector 11, the current limiting core 2 can be directly pulled out of the connector 11 by clamping the front end of the guide column 2c1 with tweezers.

[0040] Embodiment 2

[0041] The structure and principle of this embodiment are basically the same as those of the first embodiment, except that: in this embodiment, the blocking member 13 is a blocking ring threadedly connected to the connector 11 .

[0042] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A gas self-closing valve, comprising a valve body (1) with a front and rear end being an air inlet end (1a) and an air outlet end (1b), wherein a flow limiting core (2) is arranged in the air inlet end (1a), a joint (11) is connected to the port of the air inlet end (1a) through a thread, a front end of the joint (11) extends out of the air inlet end (1a) and a union cap (12) is connected to the front end of the joint (11), wherein: The current limiting core (2) is located in the joint (11), and an annular stop shoulder (11b) is provided on the inner side of the rear end of the joint (11). An annular stop member (13) is detachably connected to the joint (11) near the front end, and the front end of the current limiting core (2) abuts against the stop member (13), and the rear end of the current limiting core (2) abuts against the annular stop shoulder (11b).

2. The gas self-closing valve according to claim 1, characterized in that: The connector (11) is provided with an annular groove (11c), and the blocking member (13) is a retaining spring arranged in the annular groove (11c).

3. The gas self-closing valve according to claim 1, characterized in that: The blocking member (13) is a blocking ring threadedly connected to the joint (11).

4. The gas self-closing valve according to claim 2 or 3, characterized in that: The joint (11) is provided with a connecting hole (11d) and an assembly hole (11e) in sequence along the front-to-back direction; the connecting hole (11d) is a hexagonal hole, and the assembly hole (11e) is a round hole; the blocking member (13) and the current limiting core (2) are both located in the assembly hole (11e); and the diameter of the assembly hole (11e) is less than or equal to the radius of the inscribed circle of the connecting hole (11d).

5. The gas self-closing valve according to claim 4, characterized in that: The current limiting core (2) comprises a cylindrical shell (2a) with openings at both ends, an annular abutment seat (2b) threadedly connected to the rear end of the shell (2a), and a sealing body (2c) slidably connected to the shell (2a) along the front-back direction. An annular guide part 1 (2a1) is provided on the inner side of the front end of the shell (2a). The outer wall of the annular guide part 1 (2a1) is fixedly connected to the inner wall of the front end of the shell (2a) through a plurality of first legs (2a2). An annular guide part 2 (2b1) is provided in the annular abutment seat (2b). The outer wall of the annular guide part 2 (2b1) is fixedly connected to the inner wall of the annular abutment seat (2b) through a plurality of second legs (2b2). The sealing body (2c) comprises a guide column (2c1) and a circular sealing sheet (2c2) fixedly connected to the outer side of the middle part of the guide column (2c1). The circular sealing sheet (2c2) is located between the annular guide part 1 (2a1) and the annular guide part 2 (2b1); the outer diameter of the circular sealing sheet (2c2) is smaller than the inner diameter of the housing (2a); the outer diameter of the circular sealing sheet (2c2) is larger than the inner diameter of the annular abutting seat (2b); the front end of the guide column (2c1) is matched with the inner hole of the annular guide part 1 (2a1); the rear end of the guide column (2c1) is matched with the inner hole of the annular guide part 2 (2b1); a supporting spring (2d) is provided on the outer sleeve of the guide column (2c1); the two ends of the supporting spring (2d) are respectively abutted against the circular sealing sheet (2c2) and each second support leg (2b2); when the circular sealing sheet (2c2) is abutted against the annular guide part 1 (2a1), the front end of the guide column (2c1) is located in the connecting hole (11d).

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