CN112460324B

CN112460324B - Gas self-closing valve of centralized control chamber

Info

Publication number: CN112460324B
Application number: CN202011044028.7A
Authority: CN
Inventors: 李俊德; 张见宗
Original assignee: Pinfeng Gas Safety Technology Guangdong Co ltd
Current assignee: Pinfeng Gas Safety Technology Guangdong Co ltd
Priority date: 2020-09-28
Filing date: 2020-09-28
Publication date: 2021-08-20
Anticipated expiration: 2040-09-28
Also published as: CN112460324A

Abstract

The invention relates to the field of household gas safety valves and discloses a centralized control chamber gas self-closing valve which comprises a valve casing, wherein an air inlet pipe and an air guide pipe are respectively arranged on two sides of the valve casing, an upper sealing cover is fixedly sleeved on the top of the valve casing, a diaphragm in a balanced state is arranged on the top of an inner cavity of the valve casing, a linkage shaft is fixedly sleeved in the middle of the diaphragm, and the bottom end of the linkage shaft is fixedly connected with a limiting sealing plate positioned below the diaphragm. This centralized control room gas relief valve, through the internal diameter of disk seat both sides in the intake pipe all from outer to interior evenly reduced structural design, and utilize the mode of steel wire connection valve ball and linkage piece, supply to press the prerequisite of the unusual effect that realizes safe self-closing at the gas, disk seat and valve ball replace current drive mode, the effectual transmission that has reduced power truns into the loss of horizontal atress by upper and lower atress, thereby ensure that the superpressure appears in the gas supply, during the low pressure situation, can be stable, timely realization is closed, thereby ensure that the safety protection effect of gas relief valve is better.

Description

Gas self-closing valve of centralized control chamber

Technical Field

The invention relates to the field of household gas safety valves, in particular to a gas self-closing valve of a centralized control room.

Background

Along with the development of people's life, green energy such as natural gas also gets popular, and more families all use natural gas, because gas such as natural gas is flammable and explosive, when the gas is used, safety protection measure is also very important, and domestic gas pipeline end needs install the gas relief valve to when the gas feed is unusual, self-closing plays safety protection's effect.

The existing gas safety valve is also called as a gas self-closing valve, an elastic diaphragm is arranged in the gas self-closing valve, the elastic diaphragm is in a parallel and level balance state by utilizing the pressure supplied by gas and matching the suction force of a magnet, and when the problems of overpressure, underpressure or overcurrent and the like occur, the elastic diaphragm is bounced or bounced down, so that the transverse valve rod can be automatically closed when moving horizontally.

However, the conduction of the force of the existing household gas safety self-closing valve is converted from vertical stress to horizontal stress, so that the transmission structure is blocked due to the adhesion of impurities such as dust and tar in a gas pipeline between the horizontal pull shaft and the limit structure thereof and between the horizontal pull shaft and the vertical pull shaft, the problem that the transmission structure cannot be effectively automatically closed when the gas pressure supply is abnormal is solved, the loss of the force transmission of each structural part is large, the self-closing cannot be stably and timely realized easily when the gas pressure supply is abnormal, and the problem of potential safety hazard is easily caused.

Disclosure of Invention

The invention provides a gas self-closing valve of a centralized control chamber, which has the advantages of stably and timely realizing self-closing when the gas supply is abnormal and being not easy to clamp a shell, and solves the technical problems mentioned in the center of the background technology.

In order to achieve the above purpose, the invention provides the following technical scheme to realize: a gas self-closing valve of a centralized control room comprises a valve casing, wherein an air inlet pipe and an air guide pipe are respectively arranged on two sides of the valve casing, an upper sealing cover is fixedly sleeved on the top of the valve casing, a diaphragm in a state is arranged on the top of an inner cavity of the valve casing, a linkage shaft is fixedly sleeved in the middle of the diaphragm, a limiting sealing plate positioned below the diaphragm is fixedly connected to the bottom of the linkage shaft, an upper magnetic plate is arranged at the bottom of the limiting sealing plate, a first lower magnetic plate is adsorbed at the bottom of the upper magnetic plate, a linkage block is fixedly connected to the bottom of the first lower magnetic plate, balance springs are fixedly connected between two sides of the linkage block and two side walls of the valve casing, a valve seat is arranged inside the air inlet pipe, the inner diameters of two sides of the valve seat are uniformly reduced from outside to inside, a steel wire positioned in the balance springs is fixedly connected to the middle of one side of the linkage block, one end of the steel wire penetrates through the valve seat and is fixedly connected with a valve ball, the diameter of valve ball is less than the diameter of disk seat, and the valve ball diameter is greater than the inboard diameter of disk seat, the bottom of linkage piece is equipped with the next magnetic sheet of second, the bottom of valve casing inner chamber is equipped with the location magnetic sheet that is located linkage piece below.

Optionally, a transmission shaft is arranged between the limiting sealing plate and the upper magnetic plate, the top end of the transmission shaft is in threaded sleeve joint with the bottom end of the limiting sealing plate, and the bottom end of the transmission shaft is fixedly connected with the top of the upper magnetic plate.

Optionally, the both sides inner wall of valve casing is fixedly connected with the locating plate that is located intake pipe, air duct department respectively, and the locating plate passes through the bolt fastening on the inner wall of valve casing, two the middle part of locating plate respectively with two balance spring's one end fixed connection, two the guiding gutter that is located the balance spring outside all is seted up on the locating plate, one the middle part and the steel wire activity of locating plate cup joint, and this locating plate still passes through screw fixed connection with one side of disk seat and is in the same place, the outside of disk seat is laminated with the inner wall of intake pipe.

Optionally, the both sides of valve ball all reserve the notch, and the notch endotheca is equipped with the spacing ring, the one end of steel wire is fixed on one side spacing ring of valve ball, six spacing axles of one side fixedly connected with of valve casing are kept away from to the disk seat, six spacing axle all with the surface laminating of valve ball, and six spacing axles are symmetrical with the axle center of valve ball, six the fixed cover of one end that the disk seat was kept away from to the spacing axle is equipped with the limiting plate, the side fixedly connected with extension spring that resets of limiting plate, the fixed suit of one end that the extension spring that resets kept away from the limiting plate is on the spacing ring of valve ball opposite side.

Optionally, the steel wire is fixedly sleeved with a flow-passing plate located in the inner cavity at the right side of the valve seat, and an outer inclined plane of the flow-passing plate is matched with an inclined plane of the inner cavity at the right side of the valve seat.

Optionally, the inside of intake pipe is equipped with the location valve plate that is located the valve ball outside, and the top fixedly connected with rotary switch of location valve plate, and the middle part of location valve plate has seted up the air channel.

Optionally, the bottom of valve casing is equipped with lower closing cap, and lower closing cap and valve casing flange joint, and the junction between lower closing cap and the valve casing still is equipped with the sealing washer.

The invention provides a gas self-closing valve of a centralized control room, which has the following beneficial effects:

1. this centralized control room gas self-closing valve, through the internal diameter of disk seat both sides in the intake pipe all from outer to interior evenly reduced structural design, and locate the valve ball of disk seat one side, and utilize the mode of steel wire connection valve ball and linkage piece, under the prerequisite that the gas pressure supply anomaly realized the effect of safe self-closing, utilize disk seat and valve ball to replace current transmission mode, the effectual transmission that reduces power truns into the loss of horizontal atress from upper and lower atress into, thereby when guaranteeing that the superpressure, the low pressure situation appears in the gas supply, can stabilize, timely realization is closed, thereby guarantee that the safety protection effect of gas relief valve is better. .

2. This centralized control room gas self-closing valve, through and through the use of steel wire, replaced current gas safety self-closing valve and adopted the axle, the structure that the through-drive is connected, make the installation simple, the current horizontal axle of drawing rather than limit structure, transversely draw between the axle and the vertical revolution mechanic that draws between the axle, because of impurity glues like dust and tar in the gas pipeline adheres to, lead to the transmission structure card shell to appear, make when letting it supply to press the appearance anomaly, the problem of unable effectual self-closing, and then ensured the long-term effective use of gas safety valve.

3. This centralized control room gas self-closing valve, in the inlet duct through the disk seat suit, and disk seat and locating plate fixed connection, the location valve plate of intake pipe mouth department is located in the cooperation, so that at gas safety valve self-closing, and supply when pressing unusual and overflowing the phenomenon does not appear, because of impurity blocks up in the gas pipeline in the gas safety valve and causes promptly, the principal ingredients of this impurity is rust, dust and tar, at this moment, close the gas of gas pipeline to the gas safety valve supply through rotatory rotary switch, thereby be convenient for clear up the gas safety valve, the maintenance.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a cutaway schematic view of FIG. 1 of the present invention;

FIG. 3 is an enlarged view of a portion of FIG. 2;

FIG. 4 is a side view of the alignment plate of the structure of FIG. 2 in accordance with the present invention;

FIG. 5 is a right side view of the valve seat of the construction of FIG. 3 in accordance with the present invention;

fig. 6 is a left side view of the valve seat of the structure of fig. 3 in accordance with the present invention.

In the figure: 1. a valve housing; 2. an air inlet pipe; 3. an air duct; 4. an upper sealing cover; 5. a membrane; 6. a linkage shaft; 7. a limit closing plate; 701. a transmission shaft; 8. an upper magnetic plate; 9. positioning a plate; 901. a diversion trench; 10. a balance spring; 11. a linkage block; 12. a first lower magnetic plate; 13. a valve seat; 131. a limiting shaft; 132. a limiting plate; 133. a return tension spring; 14. a valve ball; 15. a limiting ring; 16. a steel wire; 17. an overflow plate; 18. positioning the valve plate; 19. a rotary switch; 20. a lower sealing cover; 21. and positioning the magnetic plate.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-6, a centralized control room gas self-closing valve comprises a valve housing 1, an air inlet pipe 2 and an air guide pipe 3 are respectively arranged at two sides of the valve housing 1, an upper sealing cover 4 is fixedly sleeved at the top of the valve housing 1, a diaphragm 5 in a state is arranged at the top of an inner cavity of the valve housing 1, a linkage shaft 6 is fixedly sleeved at the middle part of the diaphragm 5, a limiting sealing plate 7 positioned below the diaphragm 5 is fixedly connected to the bottom end of the linkage shaft 6, an upper magnetic plate 8 is arranged at the bottom end of the limiting sealing plate 7, a first lower magnetic plate 12 is adsorbed at the bottom of the upper magnetic plate 8, a linkage block 11 is fixedly connected to the bottom end of the first lower magnetic plate 12, balance springs 10 are fixedly connected between two sides of the linkage block 11 and two side walls of the valve housing 1, a valve seat 13 is arranged inside the air inlet pipe 2, inner diameters of two sides of the valve seat 13 are uniformly reduced from outside to inside, a steel wire 16 positioned in the balance spring 10 is fixedly connected to the middle part of one side of the linkage block 11, one end of a steel wire 16 penetrates through the valve seat 13 and is fixedly connected with a valve ball 14, the diameter of the valve ball 14 is smaller than that of the valve seat 13, the diameter of the valve ball 14 is larger than that of the inner side of the valve seat 13, the bottom of the linkage block 11 is provided with a second lower magnetic plate, the bottom of the inner cavity of the valve shell 1 is provided with a positioning magnetic plate 21 positioned below the linkage block 11, the pressure of the inner cavity of the valve shell 1 is increased through the valve ball 14 arranged on one side of the valve seat 13 and the valve ball 14 and the linkage block 11 are connected by the steel wire 16, the diaphragm 5 is in a horizontal state under the normal pressure supply and balance state, when an overpressure condition occurs, the pressure of the inner cavity of the valve shell 1 is increased, so that the diaphragm 5 overcomes the adsorption force between the upper magnetic plate 8 and the first lower magnetic plate 12 and bounces upwards, the linkage block 11 moves downwards under the action of self gravity and the second lower magnetic plate suction force of the positioning magnetic plate 21 on the bottom of the linkage block, and the steel wire 16 pulls the valve ball 14 to move rightwards, the sealing device is used for sealing the space between the air inlet pipe 2 and the valve casing 1 to realize overpressure automatic closing, and the valve ball 14 is tightly attached to the inner wall of the valve seat 13 under pressure supply, so as to further ensure the sealing effect, when an underpressure condition occurs, the pressure supply in an air supply pipeline connected with the air inlet pipe 2 is reduced, the air pressure in the inner cavity of the valve casing 1 is reduced, so that the diaphragm 5 is bounced downwards and drives the linkage block 11 to move downwards, thereby the limiting ring 15 is used for pulling the valve ball 14 to move rightwards to be attached to the inner wall of the valve seat 13, the space between the air inlet pipe 2 and the valve casing 1 is sealed to realize underpressure automatic closing, the valve seat 13 and the valve ball 14 are used for replacing the existing transmission mode, the loss of force transmission from upper and lower stress to transverse stress is effectively reduced, thereby the stable and timely closing can be realized when the conditions of gas supply and low pressure occur, and the safety protection effect of the gas safety valve is better, and through the use of steel wire 16, avoided current horizontal pull axle rather than limit structure, transversely pull between the axle and the vertical rotating-structure who pulls between the axle, because of impurity such as dust and tar etc. adhere in the gas pipeline, lead to transmission structure card shell to appear for let it supply press when unusual, the unable effectual self-closing's of appearance problem, and then ensured the long-term effective use of gas safety valve.

Wherein, be equipped with between spacing shrouding 7 and the last magnetic sheet 8 and pass spiale 701, and pass the top of spiale 701 and the bottom screw thread of spacing shrouding 7 cup joints, pass the bottom of spiale 701 and the top fixed connection of last magnetic sheet 8, connect spacing shrouding 7 and the first magnetic sheet 12 that is in 5 middle parts of horizontality diaphragm through passing spiale 701, so that make according to the production of valve casing 1, the length through control biography spiale 701 realizes, thereby make the degree of difficulty and reduce to 1 overall structure of valve casing of gas safety valve.

Wherein, the inner walls of both sides of the valve casing 1 are fixedly connected with the positioning plates 9 respectively located at the air inlet pipe 2 and the air duct 3, and the positioning plates 9 are fixed on the inner wall of the valve casing 1 by bolts, the middle parts of the two positioning plates 9 are fixedly connected with one ends of the two balance springs 10 respectively, the two positioning plates 9 are both provided with the diversion trenches 901 located at the outer sides of the balance springs 10, the middle part of one positioning plate 9 is movably sleeved with the steel wire 16, and the positioning plate 9 is fixedly connected with one side of the valve seat 13 by screws, the outer side of the valve seat 13 is tightly attached to the inner wall of the air inlet pipe 2, the supplied gas flows to the air duct 3 through the diversion trenches 901, and the balance springs 10 connected between the middle parts of the two positioning plates 9 and the linkage block 11 are utilized, so that the linkage block 11 is located at the central line of the air inlet pipe 2 and the air duct 3 under the normal state of pressure supply, and overpressure occurs in the gas supply, When the gas is under pressure, the linkage block 11 drives one end of the steel wire 16 to move downwards, the steel wire 16 is always positioned in the ring of the balance spring 10, and the steel wire 16 is in a smooth complete state, so that the linkage block 11 can stably pull the valve ball 14 to realize abnormal self-closing of gas supply.

Wherein, the two sides of the valve ball 14 are reserved with notches, and the notches are sleeved with limit rings 15, one end of the steel wire 16 is fixed on the limit ring 15 at one side of the valve ball 14, one side of the valve seat 13 far away from the valve housing 1 is fixedly connected with six limit shafts 131, the six limit shafts 131 are all attached to the surface of the valve ball 14, and the six limit shafts 131 are symmetrical with the axis of the valve ball 14, one ends of the six limit shafts 131 far away from the valve seat 13 are fixedly sleeved with limit plates 132, the side surfaces of the limit plates 132 are fixedly connected with reset tension springs 133, one ends of the reset tension springs 133 far away from the limit plates 132 are fixedly sleeved on the limit rings 15 at the other side of the valve ball 14, the valve ball 14 is limited by the six limit shafts 131, the limit shafts 131 are ensured to keep the translational state in the opening and closing process of the gas valve, thereby being beneficial to realizing self-closing of stable translation of the valve ball 14 when the gas supply is abnormal, and the point contact between the valve ball 14 and the six limit shafts 131, the relative friction force is small, so that the movement resistance to the valve ball 14 is small, the phenomenon of shell clamping cannot be caused, the tension of the reset tension spring 133 to the valve ball 14 is smaller than the suction force between the positioning magnetic plate 21 and the second lower magnetic plate, after the pressure supply is abnormal, the small tension of the reset tension spring 133 does not influence the steel wire 16 to pull the valve ball 14 to move rightwards, the valve seat 13 is blocked, the self-closing is realized, and meanwhile, after the normal air supply is recovered, the valve ball 14 moves rightwards to be separated from the limiting shaft 131 through the control linkage block 11 and the tension of the reset tension spring 133, and the gas safety valve is opened again.

Wherein, fixed cover is equipped with the board 17 that overflows that is located disk seat 13 right side inner chamber on the steel wire 16, and the outside inclined plane that overflows board 17 and the inclined plane looks adaptation of disk seat 13 right side inner chamber, rubber tube primary election between air duct 3 and the gas-cooker is damaged, when droing, the phenomenon can appear overflowing in the gas of valve casing 1 of flowing through, at this moment, under the air current that overflows

board

17 and 3 right sides of air duct overflow, can make the board 17 that overflows move to the right, thereby make valve ball 14 move to the right the shutoff disk seat 13 along with it, the pressure of valve casing 1 inner chamber reduces, diaphragm 5 is protruding downwards, further make valve ball 14 thoroughly shutoff disk seat 13.

Wherein, the inside of intake pipe 2 is equipped with the location valve plate 18 that is located the valve ball 14 outside, and the top fixedly connected with rotary switch 19 of location valve plate 18, and the air channel has been seted up at the middle part of location valve plate 18, when gas safety valve self-closing, and when supply pressure anomaly and overcurrent phenomenon do not appear, the internal impurity of reason gas pipeline blocks up in the gas safety valve promptly and causes, the principal ingredients of this impurity is rust, dust and tar, at this moment, close the gas of gas pipeline to gas safety valve supply through rotary switch 19, thereby be convenient for clear up the gas safety valve, the maintenance.

Wherein, the bottom of valve casing 1 is equipped with lower closing cap 20, and lower closing cap 20 and valve casing 1 flange joint, the junction between lower closing cap 20 and the valve casing 1 still is equipped with the sealing washer, so that lower closing cap 20 is taken off from the bottom of gas relief valve, and through dismantling the fixing bolt on the locating plate 9, can be with valve seat 13, the whole valve casing 1 that draws of locating plate 9 in, and the valve casing 1 is interior to be located the middle part of guiding gutter 901 and valve seat 13 to 11 spacing plates of linkage piece just, do not influence valve seat 13, locating plate 9 removes to in the valve casing 1, thereby be convenient for clear up valve seat 13.

When in use, when an overpressure condition occurs, the pressure in the inner cavity of the valve shell 1 is increased, so that the diaphragm 5 overcomes the adsorption force between the upper magnetic plate 8 and the first lower magnetic plate 12 and bounces upwards, the linkage block 11 moves downwards under the action of the self gravity and the suction force of the positioning magnetic plate 21 on the second lower magnetic plate at the bottom of the linkage block, so that the steel wire 16 pulls the valve ball 14 to move rightwards to be attached to the inner wall of the valve seat 13, the air inlet pipe 2 is blocked and sealed from the valve shell 1, the overpressure automatic closing is realized, the valve ball 14 is tightly attached to the inner wall of the valve seat 13 under the pressure supply, after the normal pressure supply is recovered, the linkage shaft 6 is pressed down to connect the upper magnetic plate 8 with the second lower magnetic plate at the top of the linkage block 11, lifting the linkage shaft 6 to enable the linkage block 11 to be positioned at the centers of the air inlet pipe 2 and the air guide pipe 3, and separating the valve ball 14 from the valve seat 13 under the tension of the reset tension spring 133 so as to recover air supply; when an under-pressure condition occurs, the pressure supply in the air supply pipeline connected with the air inlet pipe 2 is reduced, the air pressure in the inner cavity of the valve shell 1 is reduced, the diaphragm 5 is enabled to bounce downwards and drive the linkage block 11 to move downwards, so that the valve ball 14 is pulled by the limiting ring 15 to move rightwards to be attached to the inner wall of the valve seat 13, the air inlet pipe 2 and the valve shell 1 are blocked, the under-pressure automatic closing is realized, after the normal pressure supply is recovered, the linkage shaft 6 is directly lifted up to enable the linkage block 11 to be positioned at the centers of the air inlet pipe 2 and the air guide pipe 3, and under the pulling force of the reset tension spring 133, the valve ball 14 is separated from the valve seat 13, so that the air supply is recovered; when an overflowing condition occurs, under the condition of overflowing airflow on the right side of the overflowing plate 17 and the air guide pipe 3, the overflowing plate 17 moves rightwards, so that the valve ball 14 moves rightwards to plug the valve seat 13, the pressure in the inner cavity of the valve shell 1 is reduced, the diaphragm 5 protrudes downwards, the valve ball 14 is further enabled to completely plug the valve seat 13, and after the overflowing problem is solved, pressure supply is recovered according to the mode, and the overflowing valve can be used.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a centralized control room gas self-closing valve, includes valve casing (1), and the both sides of valve casing (1) are equipped with intake pipe (2), air duct (3) respectively, and the fixed cover in top of valve casing (1) is equipped with upper closing cap (4), and the top of valve casing (1) inner chamber is equipped with diaphragm (5) that are in balanced state, and the fixed cover in middle part of diaphragm (5) is equipped with universal driving shaft (6), its characterized in that: the bottom fixedly connected with of universal driving shaft (6) is located spacing shrouding (7) of diaphragm (5) below, the bottom of spacing shrouding (7) is equipped with upper magnetic plate (8), upper magnetic plate (8)'s bottom adsorbs first magnetic plate (12) of stepping down, the bottom fixedly connected with linkage piece (11) of first magnetic plate (12) of stepping down, all fixedly connected with balance spring (10) between the both sides of linkage piece (11) and the both sides wall of valve casing (1), the inside of intake pipe (2) is equipped with valve seat (13), the internal diameter of valve seat (13) both sides all reduces from outer to inner evenly, the middle part fixedly connected with of linkage piece (11) one side is located steel wire (16) in balance spring (10), the one end of steel wire (16) runs through valve seat (13) and fixedly connected with valve ball (14), the diameter of valve ball (14) is less than the diameter of valve seat (13), and valve ball (14) diameter is greater than the inboard diameter of disk seat (13), the bottom of linkage piece (11) is equipped with the lower magnetic sheet of second, the bottom of valve casing (1) inner chamber is equipped with location magnetic sheet (21) that are located linkage piece (11) below.

2. The centralized control chamber gas self-closing valve according to claim 1, characterized in that: be equipped with between spacing shrouding (7) and upper magnetic plate (8) and pass spiale (701), and the top of passing spiale (701) and the bottom screw thread of spacing shrouding (7) cup joints, the bottom of passing spiale (701) and the top fixed connection of upper magnetic plate (8).

3. The centralized control chamber gas self-closing valve according to claim 1, characterized in that: the both sides inner wall of valve casing (1) is fixedly connected with locating plate (9) that are located intake pipe (2), air duct (3) respectively, and locating plate (9) pass through the bolt fastening on the inner wall of valve casing (1), two the middle part of locating plate (9) respectively with the one end fixed connection of two balance spring (10), two guiding gutter (901) that are located balance spring (10) outside are all seted up on locating plate (9), one the middle part and the steel wire (16) activity of locating plate (9) cup joint, and this locating plate (9) still pass through screw fixed connection with one side of disk seat (13) and be in the same place, the outside of disk seat (13) is laminated with the inner wall of intake pipe (2).

4. The centralized control chamber gas self-closing valve according to claim 1, characterized in that: the both sides of valve ball (14) all reserve the notch, and the notch endotheca is equipped with spacing ring (15), the one end of steel wire (16) is fixed on one side spacing ring (15) of valve ball (14), one side fixedly connected with six spacing axles (131) of valve casing (1) are kept away from in disk seat (13), six spacing axle (131) all with the surface laminating of valve ball (14), and six spacing axles (131) are symmetrical with the axle center of valve ball (14), six the fixed cover of one end that disk seat (13) were kept away from in spacing axle (131) is equipped with limiting plate (132), the side fixedly connected with of limiting plate (132) restores to the throne extension spring (133), the fixed cover of one end that limiting plate (132) were kept away from in extension spring (133) that restores to the throne is adorned on limiting ring (15) of valve ball (14) opposite side.

5. The centralized control chamber gas self-closing valve according to claim 1, characterized in that: the steel wire (16) is fixedly sleeved with a flow passing plate (17) positioned in an inner cavity on the right side of the valve seat (13), and an outer inclined plane of the flow passing plate (17) is matched with an inclined plane of the inner cavity on the right side of the valve seat (13).

6. The centralized control chamber gas self-closing valve according to claim 1, characterized in that: the air inlet pipe (2) is internally provided with a positioning valve plate (18) located on the outer side of the valve ball (14), the top end of the positioning valve plate (18) is fixedly connected with a rotary switch (19), and the middle of the positioning valve plate (18) is provided with a vent groove.

7. The centralized control chamber gas self-closing valve according to claim 1, characterized in that: the bottom of valve casing (1) is equipped with down closing cap (20), and lower closing cap (20) and valve casing (1) flange joint, and the junction between lower closing cap (20) and valve casing (1) still is equipped with the sealing washer.