A gas self-closing valve

Abstract

The gas self-closing valve involved in the present invention includes a valve body, a valve cover, a limit plate, a valve core assembly, a valve stem assembly and a flow-through sealing assembly. The medium introduced into the valve body can pass through the flow-through sealing assembly and enter the area where the valve core assembly is located; and the flow-through sealing assembly can use the pressure change of the medium to close the medium channel flowing to the valve core assembly. The present invention uses the pressure change of the medium when the gas self-closing valve is working and there is an overcurrent, underpressure and overpressure, and uses this as a basis to close the medium channel of the flow-through sealing assembly, so as to achieve the integrated setting of the overcurrent, underpressure and overpressure functions on the gas self-closing valve, and then realize the modular design of the gas self-closing valve, which has the effects of simplifying the structure, facilitating installation and reducing costs.

Description

Technical Field

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

[0002] The gas self-closing valve is installed on the pipeline of the low-pressure gas system. When the pipeline gas supply pressure is under-pressure or over-pressure, it can automatically close without electricity or other external power and needs to be opened manually.

[0003] At present, the existing gas self-closing valve has a complex structure. Specifically, the sealing component for realizing over-current closing and the sealing component for realizing under-pressure or over-pressure closing are designed separately and installed in the valve body of the gas self-closing valve in sequence, which is not convenient for the overall production and assembly of the gas self-closing valve. Summary of the invention

[0004] In view of this, it is necessary to provide a gas self-closing valve for solving the above technical problems.

[0005] A gas self-closing valve, comprising a valve body, a valve cover, a stop plate, a valve core assembly and a valve stem assembly, wherein the stop plate and the valve cover are mounted on the valve body, the valve core assembly is movably connected to the stop plate, and the valve stem assembly can selectively drive the valve core assembly to move up and down relative to the stop plate;

[0006] An overflow sealing assembly is installed in the valve body, and the medium introduced into the valve body can pass through the overflow sealing assembly and enter the area where the valve core assembly is located; and the overflow sealing assembly can use the pressure change of the medium to close the medium channel flowing to the valve core assembly.

[0007] In the present application, an overflow sealing assembly is utilized to close the medium channel according to the medium pressure, thereby realizing the integrated setting of the overflow, underpressure and overpressure functions on the gas self-closing valve, thereby realizing the modular design of the gas self-closing valve, which has the effects of simplifying the structure, facilitating installation and reducing costs.

[0008] In one of the embodiments, the flow sealing assembly includes an air inlet cylinder, a guide rod, a flow plug and an air outlet cylinder, the air inlet cylinder is installed on the valve body, the guide rod is arranged to penetrate the air inlet cylinder, wherein a sealing plug is fixedly connected to one end of the guide rod extending out of the air inlet cylinder, the guide rod can drive the sealing plug to press against the air inlet cylinder to block the air inlet passage of the air inlet cylinder; the flow plug is movably installed between the guide rod and the air outlet cylinder, and the medium introduced through the air inlet passage can push the flow plug against the air outlet cylinder to block the air outlet passage of the air outlet cylinder.

[0009] It can be understood that, through the above-mentioned structural setting, the structural setting of the overflow sealing assembly is specifically implemented, so that when the overflow sealing assembly is assembled in the valve body for use, the guide rod can be used to drive the sealing plug to seal the air inlet channel on the air inlet cylinder, so as to close the gas self-closing valve when under-pressure or over-pressure occurs; the overflow plug can be used to seal the air outlet channel on the air outlet cylinder, so as to close the gas self-closing valve when over-current occurs.

[0010] In one of the embodiments, the flow sealing assembly further includes a first elastic member, two ends of which respectively abut against the guide rod and the air inlet cylinder, and the first elastic member can elastically push the guide rod toward the air outlet cylinder.

[0011] It can be understood that, through the above-mentioned structural arrangement, the first elastic member is utilized to elastically push the guide rod, thereby specifically realizing the valve closing function of the gas self-closing valve when under-pressure or over-pressure occurs.

[0012] In one of the embodiments, a guide groove and an air guide hole are provided on the guide rod, and the medium introduced from the air intake passage of the air intake cylinder can flow toward the air outlet cylinder through the guide groove and the air guide hole.

[0013] It can be understood that, through the structural arrangement of the guide groove and the air guide hole on the guide rod, the guide rod can specifically implement the guiding effect of the medium, so that the medium introduced into the air intake channel on the air intake cylinder can flow into the air outlet cylinder through the guide rod.

[0014] In one embodiment, the flow sealing assembly further includes a second elastic member, two ends of which respectively abut against the air outlet tube and the flow plug, and the second elastic member can elastically push the flow plug in a direction away from the air outlet tube.

[0015] It can be understood that, through the above-mentioned structural arrangement, the second elastic member is utilized to elastically push the flow plug, thereby specifically realizing the valve closing function of the gas self-closing valve when the flow is excessive.

[0016] In one embodiment, the flow plug includes a sealing plate portion, a first guide rod portion and a second guide rod portion, wherein the first guide rod portion and the second guide rod portion are installed on two opposite sides of the sealing plate portion, wherein the first guide rod portion is matched with the air outlet guide, and the second guide rod portion is matched with the guide rod guide.

[0017] It can be understood that through the above-mentioned structural setting, the structural setting of the flow plug is specifically implemented, so that the flow plug can be assembled between the air outlet tube and the guide rod through the cooperation between the first guide rod part and the air outlet tube and the second guide rod part and the guide rod, and the stability of the flow plug's movement between the air outlet tube and the guide rod is ensured, thereby ensuring the stability of the gas self-closing valve closing when the flow is passing.

[0018] In one of the embodiments, the valve core assembly includes a valve core, a fixing frame and a cam, the limit plate is mounted on the valve body through the fixing frame, the cam is rotatably mounted on the fixing frame, and the valve core passes through the fixing frame and the limit plate, wherein one end of the cam cooperates with the valve core, and the other end of the cam extends out of the fixing frame and selectively abuts against the air outlet, and when the valve core drives the cam to rotate relative to the fixing frame, the cam can push the air outlet toward the direction of the air inlet, so that the sealing plug on the guide rod releases the blockage of the air inlet channel on the air inlet.

[0019] It can be understood that, through the above-mentioned structural setting, the structure of the valve core assembly is specifically implemented, so that the power transmission between the valve core assembly and the flow sealing assembly when the gas self-closing valve is normally opened is achieved, and the stability of the power transmission is ensured.

[0020] In one embodiment, the valve core assembly also includes a magnetic component, which is installed on one end of the valve core that extends out of the limit plate; the valve stem assembly includes a valve stem and a magnetic matching component, which is installed on the valve stem, and the valve stem can act on the valve core through the magnetic cooperation between the magnetic matching component and the magnetic component.

[0021] It can be understood that the cooperation between the valve core assembly and the valve stem assembly is specifically achieved through the above-mentioned structural arrangement.

[0022] In one of the embodiments, the valve core assembly further includes a magnetic spacer, the magnetic member is disposed in the magnetic spacer and is fixed to one end portion of the valve core by a connecting member.

[0023] It can be understood that through the above-mentioned structural setting, the assembly connection of the magnetic component on the valve core is specifically realized, ensuring that the magnetic attraction force between the magnetic matching component and the magnetic component is greater than the magnetic attraction force between the magnetic component and the limit plate, thereby realizing the driving operation of the valve core assembly when the valve stem assembly is working.

[0024] In one of the embodiments, the valve core includes a connecting frame, and the cam is provided with a connecting ring sleeve matching the connecting frame, the connecting ring sleeve is arranged in the connecting frame, and the valve core can drive the cam to rotate on the fixed frame through the cooperation between the connecting frame and the connecting ring sleeve.

[0025] It can be understood that, through the above-mentioned structural setting, the cooperation between the valve core and the cam is specifically realized, so that when the valve core is driven by the valve stem assembly to rise, it can drive the cam to swing on the fixed frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A cross-sectional view of a gas self-closing valve provided in one embodiment of the present application, wherein the gas self-closing valve is in a closed state.

[0027] Figure 2 A cross-sectional view of a gas self-closing valve provided in one embodiment of the present application, wherein the gas self-closing valve is in an open valve state.

[0028] Figure 3 It is a schematic diagram of the structure of the flow-through sealing assembly in this application.

[0029] Figure 4 It is a cross-sectional view of the flow sealing assembly in this application.

[0030] Figure 5 This is a schematic diagram of the structure when the valve core assembly and the limit plate are assembled and connected in this application.

[0031] Figure 6 This is an exploded view of the valve core assembly and the limit plate in this application.

[0032] Among them, 10, valve body; 11, guide groove; 20, valve cover; 30, limit plate; 40, valve core assembly; 41, valve core; 411, connecting frame; 412, guide column; 42, fixing frame; 421, through hole; 43, cam; 431, connecting ring; 44, magnetic part; 45, magnetic spacer; 46, connecting part; 461, screw; 462, stud; 50, valve stem assembly; 51, valve stem; 52, magnetic matching part; 53, diaphragm; 531, diaphragm Fixed plate; 54, lifting button; 55, lifting cap; 501, retaining spring; 60, flow sealing assembly; 61, air inlet cylinder; 611, air inlet passage; 62, guide rod; 621, guide groove; 622, air guide hole; 63, flow plug; 631, sealing plate portion; 632, first guide rod portion; 633, second guide rod portion; 64, air outlet cylinder; 641, air outlet passage; 65, sealing plug; 66, first elastic member; 67, second elastic member; 70, ball valve assembly. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] It should be noted that when an element is referred to as being "provided on" another element, it may be directly provided on the other element or there may be a central element. When an element is considered to be "provided on" another element, it may be directly provided on the other element or there may be a central element at the same time. When an element is considered to be "fixed to" another element, it may be directly fixed to the other element or there may be a central element at the same time.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0036] See also Figures 1 to 6 The present invention provides a gas self-closing valve, including a valve body 10, a valve cover 20, a limit plate 30, a valve core assembly 40, a valve stem assembly 50 and a flow-through sealing assembly 60.

[0037] The limiting plate 30 and the valve cover 20 of this embodiment are installed on the valve body 10 , the valve core assembly 40 is movably connected to the limiting plate 30 , and the valve stem assembly 50 can selectively drive the valve core assembly 40 to move up and down relative to the limiting plate 30 .

[0038] The valve core assembly 40 of this embodiment includes a valve core 41, a fixing frame 42, a cam 43 and a magnetic member 44. The limit plate 30 is installed on the valve body 10 through the fixing frame 42, that is, the limit plate 30 is installed on the fixing frame 42, and the cam 43 is rotatably installed on the fixing frame 42. The valve core 41 is arranged through the fixing frame 42 and the limit plate 30, wherein one end of the cam 43 cooperates with the valve core 41. The magnetic member 44 of this embodiment is installed on the valve core 41 and extends out of the limit plate 30, so that the valve stem assembly 50 can specifically drive the valve core 41 to move up and down relative to the limit plate 30 by magnetically attracting the magnetic member 44, so that the cam 43 rotates on the fixing frame 42. It should be noted that the magnetic member 44 of this embodiment is a magnet.

[0039] In which, a guide column 412 is provided on the valve core 41 of this embodiment, and a guide groove 11 matching the guide column 412 is provided on the valve body 10. The guide column 412 of the valve core 41 is partially inserted into the guide groove 11 of the valve body 10, and the valve core 41 can be slidably connected to the valve body 10 through the cooperation between the guide column 412 and the guide groove 11 to guide the movement of the valve core 41 in the valve body 10.

[0040] In this embodiment, the valve core assembly 40 of this embodiment also includes a magnetic spacer 45, and the magnetic component 44 is arranged in the magnetic spacer 45 and fixed to one side end of the valve core 41 by a connecting component 46, so as to specifically realize the assembly connection of the magnetic component 44 on the valve core 41.

[0041] It can be understood that the magnetic spacer 45 is used to isolate the magnetic member 44 from the limit plate 30, so that the magnetic attraction force of the valve stem assembly 50 on the magnetic member 44 is greater than the magnetic attraction force between the magnetic member 44 and the limit plate 30, thereby realizing the driving operation of the valve stem assembly 50 on the valve core assembly 40 when the valve stem assembly 50 is working. It should be noted that the connecting member 46 of this embodiment is specifically configured as a screw 461, and a stud 462 matching the screw 461 can be embedded in the valve core 41, so that the screw 461 passes through the magnetic member 44 and the magnetic spacer 45 and is screwed to the stud 462 of the valve core 41.

[0042] The valve stem assembly 50 of this embodiment includes a valve stem 51, a magnetic fitting 52 and a diaphragm 53. The valve stem 51 is movably mounted on the valve cover 20. The magnetic fitting 52 is mounted on one end of the valve stem 51 facing the valve core 41. The diaphragm 53 is arranged on the valve stem 51 and is clamped and fixed by a diaphragm fixing plate 531 and the magnetic fitting 52. The outer periphery of the diaphragm 53 is arranged between the valve body 10 and the valve cover 20 to separate the chamber between the valve body 10 and the valve cover 20 into two independent chambers to meet the use requirements of the gas self-closing valve. It should be noted that the magnetic fitting 52 of this embodiment is set as an armature.

[0043] Among them, the valve stem assembly 50 of this embodiment also includes a lifting button 54 and a lifting cap 55. The part of the valve stem 51 that extends out of the lifting cap 55 is clamped with a retaining spring 501 to limit the lifting cap 55 on the valve stem 51; and, the lifting cap 55 is limited by the lifting button 54, so that when a person drives the valve stem assembly 50, the valve stem 51 can be driven by lifting and pulling the lifting cap 55.

[0044] The overflow seal assembly 60 of this embodiment is installed in the valve body 10, and the medium introduced into the valve body 10 can pass through the overflow seal assembly 60 to enter the area where the valve core assembly 40 is located, and the overflow seal assembly 60 can use the pressure change of the medium to close the medium channel flowing to the valve core assembly 40. It should be noted that when the gas self-closing valve is working and there is an overcurrent, underpressure and / or overpressure, the medium will undergo a pressure change, and at this time the overflow seal assembly 60 can close its channel for the medium to pass through, thereby achieving the use requirements of the gas self-closing valve.

[0045] It can be understood that when the gas self-closing valve of this embodiment is working, the flow sealing assembly 60 is used to close the medium channel according to the medium pressure, thereby realizing the integrated setting of the flow, underpressure and overpressure functions on the gas self-closing valve, and then realizing the modular design of the gas self-closing valve, which has the effects of simplifying the structure, facilitating installation and reducing costs.

[0046] Specifically, the flow sealing assembly 60 of the present embodiment includes an air inlet cylinder 61, a guide rod 62, a flow plug 63 and an air outlet cylinder 64. The air inlet cylinder 61 is installed on the valve body 10, specifically, it is installed on the valve body 10 in a threaded manner. The guide rod 62 is arranged to penetrate the air inlet cylinder 61, wherein a sealing plug 65 is fixedly connected to one end of the guide rod 62 extending out of the air inlet cylinder 61. The guide rod 62 can drive the sealing plug 65 to press against the air inlet cylinder 61 to block the air inlet channel 611 of the air inlet cylinder 61; the flow plug 63 is movably installed between the guide rod 62 and the air outlet cylinder 64, and the medium introduced through the air inlet channel 611 can push the flow plug 63 against the air outlet cylinder 64 to block the air outlet channel 641 of the air outlet cylinder 64. That is to say, when the overflow sealing assembly 60 of this embodiment is working, the channels on the overflow sealing assembly 60 can be closed by closing the air inlet channel 611 of the air inlet cylinder 61 or closing the air outlet channel 641 of the air outlet cylinder 64 .

[0047] It can be understood that when the overflow sealing assembly 60 of the present embodiment is assembled in the valve body 10 for use, when the gas self-closing valve is under-pressure or over-pressured, the guide rod 62 drives the sealing plug 65 to seal the air inlet channel 611 on the air inlet cylinder 61, thereby achieving the valve closing function of the gas self-closing valve; and when the gas self-closing valve has an overcurrent, the overflow plug 63 seals the air outlet channel 641 on the air outlet cylinder 64, thereby achieving the valve closing function of the gas self-closing valve.

[0048] The flow sealing assembly 60 of the present embodiment further includes a first elastic member 66, the two ends of which are respectively against the guide rod 62 and the air inlet cylinder 61, and the first elastic member 66 can elastically push the guide rod 62 toward the air outlet cylinder 64, so that the gas self-closing valve can utilize the elastic push of the first elastic member 66 against the guide rod 62 to realize the valve closing function of the gas self-closing valve when underpressure or overpressure occurs. It should be noted that the first elastic member 66 of the present embodiment is specifically installed between the guide rod 62 and the air inlet cylinder 61 in a pre-compressed manner, and the first elastic member 66 can be specifically set as a spring.

[0049] In this embodiment, a guide groove 621 and an air guide hole 622 are provided on the guide rod 62 of this embodiment, and the medium introduced by the air inlet channel 611 can flow to the air outlet cylinder 64 through the guide groove 621 and the air guide hole 622, so as to specifically realize the guiding effect of the guide rod 62 on the medium, so that the medium introduced by the air inlet channel 611 on the air inlet cylinder 61 can flow into the air outlet cylinder 64 through the guide rod 62.

[0050] Secondly, the flow sealing assembly 60 of the present embodiment further includes a second elastic member 67, the two ends of which are respectively against the gas outlet 64 and the flow plug 63, and the second elastic member 67 can elastically push the flow plug 63 in the direction away from the gas outlet 64, so that the gas self-closing valve can use the elastic push of the second elastic member 67 against the flow plug 63, specifically realizing the valve closing function of the gas self-closing valve when the flow is flowing. It should be noted that the second elastic member 67 of the present embodiment is also configured as a spring, and the second elastic member 67 is installed in a natural state at a position between the gas outlet 64 and the flow plug 63.

[0051] In this embodiment, the flow plug 63 of this embodiment includes a sealing plate portion 631, a first guide rod portion 632 and a second guide rod portion 633, wherein the first guide rod portion 632 and the second guide rod portion 633 are installed on two opposite sides of the sealing plate portion 631, wherein the first guide rod portion 632 is guided and matched with the air outlet tube 64, and the second guide rod portion 633 is guided and matched with the guide rod 62, thereby specifically realizing the structural setting of the flow plug 63, so that the flow plug 63 can be assembled between the air outlet tube 64 and the guide rod 62 through the cooperation between the first guide rod portion 632 and the air outlet tube 64 and the second guide rod portion 633 and the guide rod 62, and ensure the stability of the flow plug 63 moving between the air outlet tube 64 and the guide rod 62, thereby ensuring the stability of the gas self-closing valve when the flow is passing.

[0052] In addition, the other end of the cam 43 in the valve core assembly 40 of the present embodiment extends out of the fixing frame 42 and selectively abuts against the air outlet cylinder 64, so that when the valve stem assembly 50 drives the valve core 41 to rise relative to the limit plate 30 through the magnetic attraction between the magnetic matching member 52 and the magnetic member 44, the valve core 41 can drive the cam 43 to swing on the fixing frame 42, so that the cam 43 can push the air outlet cylinder 64 toward the direction of the air inlet cylinder 61, so that the sealing plug 65 on the guide rod 62 can release the blockage of the air inlet passage 611 on the air inlet cylinder 61. In other words, when the valve core 41 moves upward relative to the limit plate 30, the valve core 41 can push the guide rod 62 through the cam 43, so as to specifically realize the release of the blockage of the air inlet passage 611 on the air inlet cylinder 61 by the sealing plug 65 on the guide rod 62, that is, specifically realize the manual valve opening operation when the gas self-closing valve is working. It should be noted that the flow plug 63 of this embodiment is arranged inside the position where the air outlet pipe 64 and the guide rod 62 can abut against each other, so that when the air outlet pipe 64 pushes the guide rod 62, it will not affect the cooperation between the flow plug 63 and the air outlet pipe 64.

[0053] It can be understood that when the gas self-closing valve of this embodiment is working, the cam 43 is used to realize the power transmission between the valve core 41 and the air outlet tube 64, so as to specifically realize the power transmission between the valve core assembly 40 and the flow sealing assembly 60 when the gas self-closing valve is normally opened, and ensure the stability of the power transmission.

[0054] The valve core 41 of this embodiment includes a connecting frame 411, and a connecting ring sleeve 431 matching the connecting frame 411 is provided on the cam 43. The connecting ring sleeve 431 is provided in the connecting frame 411, and the valve core 41 can drive the cam 43 to rotate on the fixing frame 42 through the cooperation between the connecting frame 411 and the connecting ring sleeve 431. In this way, the cooperation between the valve core 41 and the cam 43 is specifically realized, so that the valve core 41 is driven by the valve stem assembly 50 to drive the cam 43 to swing on the fixing frame 42 during the upward process.

[0055] In addition, it should be noted that the outer diameter of the connecting frame 411 of the present embodiment is larger than the aperture of the through hole 421 on the fixing frame 42 through which the valve core 41 extends, so that the valve core 41 can limit its movement through the collision between the connecting frame 411 and the fixing frame 42, thereby specifically realizing the maximum position of the movement of the valve core 41 in the valve body 10 of the gas self-closing valve, thereby ensuring the normal valve opening operation of the gas self-closing valve during operation.

[0056] As can be seen from the above, when the gas self-closing valve of this embodiment is opened, a person manually pulls the lifting button 54, and driven by the lifting cap 55, the valve stem 51 is driven to move upward in the valve body 10, and the diaphragm fixing plate 531, the diaphragm 53 and the magnetic matching member 52 are driven to move upward. By utilizing the magnetic matching between the magnetic matching member 52 and the magnetic member 44 on the valve core 41, the valve stem 51 can drive the valve core 41 to move upward while rising, until the connecting frame 411 on the valve core 41 is limited by the fixing frame 42, that is, when the valve core 41 moves upward to the designed valve opening distance, the force of the medium placed in the area where the valve core 41 is located on the diaphragm 53 can maintain the existing state of the valve core 41. During this process, the connecting frame 411 of the valve core 41 drives the cam 43 to swing on the fixed frame 42 and push out the air cylinder 64, so that the air cylinder 64 pushes the guide rod 62 to compress the first elastic member 66, so that the sealing plug 65 on the guide rod 62 releases the seal of the air intake channel 611 on the air intake cylinder 61, that is, the purpose of opening the gas self-closing valve is achieved.

[0057] When underpressure occurs during operation of the gas self-closing valve of this embodiment, since the internal air pressure in the area where the valve core 41 on the valve body 10 is located is lower than the pressure when the gas self-closing valve is normally opened, the force exerted on the diaphragm 53 by the air pressure inside the valve body 10 is lower than the magnetic attraction force between the magnetic member 44 and the limit plate 30. In this way, the valve core 41 can move downward relative to the limit plate 30, and the connecting frame 411 on the valve core 41 loses the driving force on the cam 43. In this way, the air outlet cylinder 64 drives the cam 43 to reset under the elastic push of the first elastic member 66. At the same time, the guide rod 62 drives the sealing plug 65 to press against the air inlet channel 611 of the air inlet cylinder 61, and the purpose of closing the gas self-closing valve is achieved.

[0058] When underpressure occurs during operation of the gas self-closing valve of this embodiment, since the internal air pressure in the area where the valve core 41 on the valve body 10 is located is lower than the pressure when the gas self-closing valve is normally opened, the force exerted on the diaphragm 53 by the air pressure inside the valve body 10 is lower than the magnetic attraction force between the magnetic member 44 and the limit plate 30. In this way, the valve core 41 can move downward relative to the limit plate 30, and the connecting frame 411 on the valve core 41 loses the driving force on the cam 43. In this way, the air outlet cylinder 64 drives the cam 43 to reset under the elastic push of the first elastic member 66. At the same time, the guide rod 62 drives the sealing plug 65 to press against the air inlet channel 611 of the air inlet cylinder 61, and the purpose of closing the gas self-closing valve is achieved.

[0059] When an overflow occurs during operation of the gas self-closing valve of the present embodiment, due to the excessive flow, the overflow plug 63 can move with the direction of the gas flow under the action of the pressure difference, so that the overflow plug 63 can overcome the elastic resistance of the second elastic member 67 and press against the air outlet tube 64 to block the air outlet channel 641 of the air outlet tube 64. In this way, no medium enters the position of the valve core 41 in the valve body 10, so that the medium pressure in the area where the valve core 41 in the valve body 10 is located is less than the pressure when the gas self-closing valve is normally opened. Therefore, at this time, the force of the medium on the diaphragm 53 becomes smaller, so that the valve core 41 moves downward relative to the limit plate 30, and the connecting frame 411 on the valve core 41 loses the driving force on the cam 43. In this way, the air outlet tube 64 drives the cam 43 to reset under the elastic push of the first elastic member 66. At the same time, the guide rod 62 drives the sealing plug 65 to press against the air inlet channel 611 of the air inlet tube 61, and the purpose of closing the gas self-closing valve is achieved.

[0060] When overpressure occurs during operation of the gas self-closing valve of this embodiment, due to the excessive pressure, the medium can separate the magnetic fitting 52 from the magnetic part 44, and the valve core 41 moves downward relative to the limit plate 30. The connecting frame 411 on the valve core 41 loses the driving force on the cam 43, so that the air outlet pipe 64 drives the cam 43 to reset under the elastic push of the first elastic member 66. At the same time, the guide rod 62 drives the sealing plug 65 to press against the air inlet channel 611 of the air inlet pipe 61, and the purpose of closing the gas self-closing valve is achieved.

[0061] In addition, it should be noted that a ball valve assembly 70 is also provided on the valve body 10 of this embodiment. The ball valve assembly 70 and the flow sealing assembly 60 are arranged on both sides of the valve core assembly 40 on the valve body 10. When the ball valve assembly 70 is working, it can realize manual closing of the channel of the valve body 10.

[0062] The technical features of the above embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0063] Those skilled in the art should recognize that the above embodiments are only used to illustrate the present invention, and are not intended to limit the present invention. As long as they are within the spirit of the present invention, appropriate changes and modifications to the above embodiments are within the scope of protection claimed by the present invention.

Claims

1. A gas self-closing valve, comprising a valve body (10), a valve cover (20), a stop plate (30), a valve core assembly (40) and a valve stem assembly (50), wherein the stop plate (30) and the valve cover (20) are mounted on the valve body (10), the valve core assembly (40) is movably connected to the stop plate (30), and the valve stem assembly (50) can selectively drive the valve core assembly (40) to move up and down relative to the stop plate (30); Features: A flow seal assembly (60) is installed in the valve body (10), and a medium introduced into the valve body (10) can pass through the flow seal assembly (60) and enter the area where the valve core assembly (40) is located; and the flow seal assembly (60) can close the medium channel flowing to the valve core assembly (40) by utilizing the pressure change of the medium; The flow sealing assembly (60) comprises an air inlet cylinder (61), a guide rod (62), a flow plug (63) and an air outlet cylinder (64); the air inlet cylinder (61) is mounted on the valve body (10); the guide rod (62) penetrates the air inlet cylinder (61); a sealing plug (65) is fixedly connected to one end of the guide rod (62) extending out of the air inlet cylinder (61); the guide rod (62) can drive the sealing plug (65) to press against the air inlet cylinder (61) to block the air inlet passage (611) of the air inlet cylinder (61); the flow plug (63) is movably mounted between the guide rod (62) and the air outlet cylinder (64); and the medium introduced through the air inlet passage (611) can push the flow plug (63) to press against the air outlet cylinder (64) to block the air outlet passage (641) of the air outlet cylinder (64); The flow sealing assembly (60) further comprises a first elastic member (66), two ends of the first elastic member (66) respectively abutting against the guide rod (62) and the air inlet cylinder (61), and the first elastic member (66) is capable of elastically pushing the guide rod (62) in the direction of the air outlet cylinder (64); The valve core assembly (40) comprises a valve core (41), a fixing frame (42) and a cam (43); the limit plate (30) is mounted on the valve body (10) through the fixing frame (42); the cam (43) is rotatably mounted on the fixing frame (42); the valve core (41) passes through the fixing frame (42) and the limit plate (30); one end of the cam (43) cooperates with the valve core (41); the other end of the cam (43) extends out of the fixing frame (42) and selectively abuts against the air outlet cylinder (64); and when the valve core (41) drives the cam (43) to swing relative to the fixing frame (42), the cam (43) can push the air outlet cylinder (64) in the direction of the air inlet cylinder (61), so that the sealing plug (65) on the guide rod (62) releases the blockage of the air inlet channel (611) on the air inlet cylinder (61).

2. The gas self-closing valve according to claim 1, characterized in that: The guide rod (62) is provided with a guide groove (621) and an air guide hole (622), and the medium introduced from the air intake channel (611) of the air intake cylinder (61) can flow toward the air outlet cylinder (64) via the guide groove (621) and the air guide hole (622).

3. The gas self-closing valve according to claim 1, characterized in that: The flow sealing assembly (60) further comprises a second elastic member (67), two ends of which are respectively pressed against the air outlet cylinder (64) and the flow plug (63), and the second elastic member (67) is capable of elastically pushing the flow plug (63) in a direction away from the air outlet cylinder (64).

4. The gas self-closing valve according to claim 1, characterized in that: The flow plug (63) comprises a sealing plate portion (631), a first guide rod portion (632) and a second guide rod portion (633), wherein the first guide rod portion (632) and the second guide rod portion (633) are installed on two opposite sides of the sealing plate portion (631), wherein the first guide rod portion (632) is in guiding cooperation with the air outlet tube (64), and the second guide rod portion (633) is in guiding cooperation with the guide rod (62).

5. The gas self-closing valve according to claim 1, characterized in that: The valve core assembly (40) also includes a magnetic component (44), which is installed on one end of the valve core (41) extending out of the limit plate (30); the valve stem assembly (50) includes a valve stem (51) and a magnetic matching component (52), which is installed on the valve stem (51), and the valve stem (51) can act on the valve core (41) through the magnetic matching between the magnetic matching component (52) and the magnetic component (44).

6. The gas self-closing valve according to claim 5, characterized in that: The valve core assembly (40) further comprises a magnetic spacer (45), wherein the magnetic component (44) is arranged in the magnetic spacer (45) and is fixed to one end of the valve core (41) by a connecting component (46).

7. The gas self-closing valve according to claim 1, characterized in that: The valve core (41) comprises a connecting frame (411), and the cam (43) is provided with a connecting ring sleeve (431) matching the connecting frame (411). The connecting ring sleeve (431) is arranged in the connecting frame (411), and the valve core (41) can drive the cam (43) to rotate on the fixing frame (42) through the cooperation between the connecting frame (411) and the connecting ring sleeve (431).

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