A pipeline gas self-closing valve

Abstract

The utility model discloses a pipeline gas self-closing valve, which structure includes a valve body with an air inlet channel and an air outlet channel and a ball valve arranged on the air outlet pipe of the valve body, a through hole is formed inside the valve body between the air inlet channel and the air outlet channel, an assembly opening is formed at the top of the valve body at a position corresponding to the through hole, a diaphragm and an end cover are sequentially arranged on the outside of the assembly opening, and a self-closing component for sealing or unsealing the through hole is also arranged on the diaphragm; the diaphragm of the utility model can drive the self-closing component to achieve overpressure closing or underpressure closing, the self-closing component is arranged on the diaphragm and corresponds to the position of the through hole, so that the pressure change of the air inlet channel or the air outlet channel directly reacts and acts on the diaphragm, and the diaphragm drives the self-closing component to respond quickly, thereby effectively improving the sensitivity of the self-closing valve.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, and more specifically, to a pipeline gas self-closing valve. Background Art

[0002] The pipeline gas self-closing valve is a device installed on the pipeline of the low-pressure gas system. When the pipeline gas supply pressure is under-pressure or over-pressure, it can automatically close without electricity or other external power, and must be opened manually. It is suitable for pipeline natural gas, liquefied petroleum gas, and artificial coal gas. The basic principle of the pipeline gas self-closing valve is to magnetize the permanent magnetic material according to the design requirements to make a multi-pole permanent magnetic linkage mechanism with permanent memory, identify the changes in the gas pressure parameters passing through it, and automatically close the valve when it exceeds the safety set value to cut off the gas source.

[0003] At present, a Chinese patent with a publication (announcement) number of CN211599634U discloses an integrated pressure-measuring gas self-closing valve, which includes a valve body with an air inlet pipe and an air outlet pipe, and a ball valve, and the air outlet pipe is also provided with a pressure measuring device; the pressure measuring device includes a pressure measuring device housing, the ball valve includes a ball valve housing, and the valve body includes a valve body shell; the ball valve housing and the pressure measuring device housing are arranged on the valve body shell, and the ball valve housing, the pressure measuring device housing, and the valve body shell are an integrated molding structure. The integrated pressure-measuring gas self-closing valve has an air inlet pipe 1 on the left side of the cavity, and an air inlet pipe 1 is provided on the left side of the cavity. There is a cutting rod 11 between the trachea 1 and the valve port, and the left end of the cutting rod 11 is a rubber cutting head 10. The right end surface of the cutting rod 11 contacts with a push block 14 that moves up and down with the column 15. The rubber cutting head 10 is pushed to the left by the push block 14 to open the valve port, and is elastically forced to the right by the telescopic spring 12 to close the valve port. The cutting rod 11 is driven to move by the linkage between the column 15 and the push block 14 to realize the opening and closing of the valve port, but the transmission of this linkage mode is not fast enough, which reduces the sensitivity. Utility Model Content

[0004] In view of the deficiencies in the prior art, the purpose of the utility model is to provide a pipeline gas self-closing valve to solve the above technical problems.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a pipeline gas self-closing valve, comprising a valve body with an air inlet channel and an air outlet channel and a ball valve arranged on the air outlet pipe of the valve body, a through hole is formed inside the valve body between the air inlet channel and the air outlet channel, an assembly opening is formed at the top of the valve body corresponding to the through hole, a diaphragm and an end cover are arranged on the outside of the assembly opening in sequence, and a self-closing component is also provided on the diaphragm for sealing or unblocking the through hole.

[0006] The utility model is further configured as follows: the self-closing component includes a plug rod, the plug rod passes through the diaphragm and is fixed at the center of the diaphragm, the upper end of the plug rod extends through the end cover and is connected to a lifting button, and the lower end of the plug rod is located in the valve body and is connected to a plug head.

[0007] The utility model is further configured as follows: an enclosing portion is formed inside the valve body at a position corresponding to the through hole, an enclosing interval is formed inside the enclosing portion and a blocking cover is threadedly connected to the top, the plug head is movably arranged in the enclosed interval and the top passes through the blocking cover to be connected to the plug rod, and a magnet is also arranged between the plug head and the plug rod.

[0008] The utility model is further configured as follows: the enclosed portion is provided with a plurality of conducting grooves equidistantly and circumferentially.

[0009] The utility model is further configured as follows: a first annular protrusion is formed on the top of the through hole and located inside the enclosing portion, a sealing gasket is fixedly installed at the center of the bottom of the plug, and a first sealing groove adapted to the first annular protrusion is formed on the bottom surface of the sealing gasket.

[0010] The utility model is further configured as follows: a sealing rib is formed on the inner bottom wall of the first sealing groove, and a rib groove adapted to the sealing rib is formed on the top of the first annular protrusion.

[0011] The utility model is further configured as follows: a second annular protrusion is formed on the top of the through hole and located outside the first annular protrusion, and a second sealing groove adapted to the second annular protrusion is formed on the bottom of the plug.

[0012] To sum up, the utility model has the following beneficial effects: under normal working pressure, the air inlet channel normally takes in air, the gas passes through the through hole and then passes through the outlet pipe and the ball valve to discharge the valve body to supply gas to the gas cooker, and the diaphragm can drive the self-closing component to achieve over-pressure closing or under-pressure closing. The self-closing component is arranged on the diaphragm and corresponds to the position of the through hole. Therefore, the pressure change of the air inlet channel or the air outlet channel directly reacts and acts on the diaphragm. The diaphragm drives the self-closing component to respond quickly, which effectively improves the sensitivity of the self-closing valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0014] Figure 1 It is a schematic cross-sectional view of the overall structure of the utility model;

[0015] Figure 2 for Figure 1 A schematic diagram of the enlarged local structure at point A in the middle.

[0016] Figure numerals: 1. valve body; 10. air inlet channel; 11. air outlet channel; 12. ball valve; 2. through hole; 20. enclosure; 21. enclosure interval; 22. baffle; 23. conducting groove; 24. first annular protrusion; 25. rib groove; 26. second annular protrusion; 3. assembly opening; 30. diaphragm; 31. end cover; 4. plug rod; 40. lifting button; 41. plug head; 42. magnet; 43. sealing gasket; 44. first sealing groove; 45. sealing rib; 46. second sealing groove; 5. fastening cover. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0018] See also Figure 1-2 As shown, a pipeline gas self-closing valve according to an embodiment of the utility model comprises a valve body 1 having an air inlet channel 10 and an air outlet channel 11 and a ball valve 12 arranged on the air outlet pipe of the valve body 1, a through hole 2 is formed inside the valve body 1 between the air inlet channel 10 and the air outlet channel 11, an assembly opening 3 is formed at the top of the valve body 1 at a position corresponding to the through hole 2, a diaphragm 30 and an end cover 31 are sequentially arranged on the outside of the assembly opening 3, and a self-closing component for sealing or unblocking the through hole 2 is also provided on the diaphragm 30.

[0019] When in use, under normal working pressure, the air inlet channel 10 (with a one-way valve built in) normally inlets air, and the gas passes through the through hole 2 and then passes through the air outlet pipe and the ball valve 12 to discharge the valve body 1 to supply gas to the gas cooker. The diaphragm 30 can drive the self-closing component to achieve overpressure closing or underpressure closing according to the change of air pressure;

[0020] The end cover 31 is fixed on the valve body 1 through the threaded connection between the fastening cover 5 and the valve body 1. When the end cover 31 is installed, it presses the diaphragm 30 to fix the diaphragm 30, and the diaphragm is used to close the air outlet channel 11.

[0021] The self-closing component includes a plug rod 4, which passes through the diaphragm 30 and is fixed at the center of the diaphragm 30. The upper end of the plug rod 4 extends through the end cover 31 and is connected to a button 40. The lower end of the plug rod 4 is located in the valve body 1 and is connected to a plug head 41. An enclosure portion 20 is formed inside the valve body 1 at a position corresponding to the through hole 2. An enclosure interval 21 is formed inside the enclosure portion 20 and a baffle 22 is threadedly connected to the top. The plug head 41 is movably arranged in the enclosure interval 21 and the top passes through the baffle 22 to be connected to the plug rod 4. A magnet 42 is also arranged between the plug head 41 and the plug rod 4. A plurality of conducting grooves 23 are equidistantly and circumferentially provided on the enclosure portion 20.

[0022] During use, when the gas source pressure of the air inlet channel 10 gradually or suddenly increases, resulting in gas overpressure, that is, the ventilation pressure exceeds twice the rated pressure, the air outlet channel 11 directly responds to the pressure change. At this time, the diaphragm 30 is subjected to an upward force that is greater than the magnetic attraction between the magnet 42 and the plug rod 4. At this time, the magnet 42 is separated from the plug rod 4 and the magnet 42 is attracted to the baffle 22 (made of metal material), thereby driving the plug head 41 to move downward along the enclosed interval 21, and the plug head 41 blocks the through hole 2, that is, the overpressure closure is achieved;

[0023] When the gas source pressure of the air inlet channel 10 is lower than the preset value or the gas supply stops, the force exerted by the gas source pressure of the air outlet channel 11 on the diaphragm 30 is weak and almost non-existent. At this time, the magnetic attraction of the magnet 42 on the baffle 22 is greater than the upward force of the diaphragm 30, so the magnet 42 is also attracted to the baffle 22 to achieve under-pressure closure.

[0024] The conducting groove 23 is provided to facilitate the gas source to be discharged from the enclosure 20 through the conducting groove 23;

[0025] The blocking cover 22 is provided to limit the moving path of the plug 41, so as to ensure that the plug 41 can move more stably, so as to block or cancel the through hole 2;

[0026] A first annular protrusion 24 is formed at the top of the through hole 2, located on the inner side of the enclosing portion 20; a sealing gasket 43 is fixedly installed at the center of the bottom of the plug 41; a first sealing groove 44 adapted to the first annular protrusion 24 is formed on the bottom surface of the sealing gasket 43; a sealing rib 45 is formed on the inner bottom wall of the first sealing groove 44, and a rib groove 25 adapted to the sealing rib 45 is formed on the top of the first annular protrusion 24; a second annular protrusion 26 is formed on the outer circle of the first annular protrusion 24 at the top of the through hole 2, and a second sealing groove 46 adapted to the second annular protrusion 26 is formed at the bottom of the plug 41.

[0027] When in use, when the plug 41 is in the blocking state, the first annular protrusion 24 and the first sealing groove 44 of the sealing gasket 43 form a first layer of sealing, and the first layer of sealing is a soft seal, wherein the sealing rib 45 and the rib groove 25 cooperate to further improve the sealing effect of the first layer of sealing;

[0028] In the above state, the second annular protrusion 26 and the second seal form a second layer of seal, and the second layer of seal is a hard seal;

[0029] The double seal formed by the first layer of soft seal and the second layer of hard seal effectively improves the sealing effect of the plug 41.

[0030] It should also be pointed out that the terms used in the present invention, such as “front”, “rear”, “vertical”, “horizontal”, etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are only used to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention.

[0031] The above is only a preferred embodiment of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A pipeline gas self-closing valve, comprising a valve body (1) having an air inlet channel (10) and an air outlet channel (11) and a ball valve (12) arranged on the air outlet pipe of the valve body (1), characterized in that: A through hole (2) is formed inside the valve body (1) between the air inlet passage (10) and the air outlet passage (11); an assembly opening (3) is formed at the top of the valve body (1) at a position corresponding to the through hole (2); a diaphragm (30) and an end cover (31) are arranged on the outside of the assembly opening (3) in sequence; a self-closing component for sealing or unblocking the through hole (2) is also arranged on the diaphragm (30); the self-closing component comprises a plug rod (4); the plug rod (4) passes through the diaphragm (30) and is fixed at the center of the diaphragm (30); the upper end of the plug rod (4) extends through the end cover (31) and is connected to a knob (40); the lower end of the plug rod (4) is located inside the valve body (1) and is connected to a plug head (41); an enclosure portion (20) is formed inside the valve body (1) at a position corresponding to the through hole (2); the enclosure portion (20) is arranged at the bottom of the end cover (31 ... An enclosed section (21) is formed inside the closing portion (20) and a baffle (22) is threadedly connected to the top; the plug (41) is movably arranged in the enclosed section (21) and the top passes through the baffle (22) to be connected to the plug rod (4); a magnet (42) is also arranged between the plug (41) and the plug rod (4); a first annular protrusion (24) is formed on the top of the through hole (2) and located on the inner side of the enclosed portion (20); a sealing gasket (43) is fixedly installed at the center of the bottom of the plug (41); a first sealing groove (44) adapted to the first annular protrusion (24) is formed on the bottom surface of the sealing gasket (43); a second annular protrusion (26) is formed on the top of the through hole (2) and located on the outer ring of the first annular protrusion (24); a second sealing groove (46) adapted to the second annular protrusion (26) is formed on the bottom of the plug (41).

2. The pipeline gas self-closing valve according to claim 1, characterized in that: The enclosed portion (20) is provided with a plurality of conducting grooves (23) at equal intervals and in a circumferential direction.

3. The pipeline gas self-closing valve according to claim 1, characterized in that: A sealing rib (45) is formed on the inner bottom wall of the first sealing groove (44), and a rib groove (25) adapted to the sealing rib (45) is formed on the top of the first annular protrusion (24).

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