CN213629062U - Large-traffic formula gas self-closing valve that opens soon - Google Patents

Abstract

The utility model provides a large-flow rotary-opening gas self-closing valve, which comprises a back pressure cavity and a valve cavity; the pressure regulating component moves back and forth along with the difference of acting force between the back pressure cavity and the valve cavity; the magnet is magnetically attracted with the bottom of the pressure regulating component; a pushing part arranged below the magnet; a limiting part for limiting the up-and-down movement of the pushing part; the pushing part is used for pushing a firing pin which is rotatably arranged in the valve cavity; the end part of the firing pin is provided with a clamping part; a rotary opening type cover plate is rotationally connected in the valve cavity, and a rolling piece matched with the clamping part is arranged on the surface of the rotary opening type cover plate; when the pressure adjusting assembly does not apply force to the firing pin, the rolling piece is connected with the clamping part in a clamping manner; when the pressure adjusting assembly applies force to the striker, the striker drives the clamping portion to rotate, the rolling piece rolls to separate from the clamping portion, and the swing cover plate seals the air path channel. The rotary-opening type cover plate is adopted to seal the gas path channel, and after the rotary-opening type cover plate is rotated to be opened, the gas path channel of the valve cavity is completely opened without any obstruction, so that the flow maximization is realized.

Description

Large-traffic formula gas self-closing valve that opens soon

Technical Field

The utility model relates to a self-closing valve technical field especially involves being a large-traffic swing formula gas self-closing valve.

Background

Gas becomes an indispensable energy source for people's life, and some districts use gas boiler collective heating, nevertheless because people know the gas not comprehensive enough, the safety precaution consciousness is not in place to cause unnecessary loss and accident. The urban gas pressure regulating equipment is not easy to generate the high-pressure supply phenomenon of pipeline gas, and the gas source must be cut off in the process of emergency repair, if a user does not close a valve in time, gas leakage can be caused when gas is supplied again, and the life and property safety of surrounding personnel can be endangered. Most of the existing gas self-closing valves are installed in front of a stove, and an inlet and an outlet are connected through threads, and a sealing piece is sealed at the inlet of the valve, so that the valve is closed, and the gas in a pipeline is cut off.

The existing pipeline gas self-closing valve is mostly used in front of indoor cookers and water heaters, the flow requirement is low, the sealing structure adopted is that a valve port and a sealing gasket are arranged at the inlet end to turn off the valve, and due to structural limitation, a plurality of parts and guide parts exist in a gas flow channel, so that the flow resistance of gas is increased, and the outlet flow is reduced.

SUMMERY OF THE UTILITY MODEL

In order to solve prior art, the restriction of self-closing valve inner structure, there are a plurality of spare parts and direction position in the gas flow way to increase the gas flow resistance, reduced export flow technical problem, the utility model provides a large-traffic swing formula gas self-closing valve, concrete technical scheme is as follows:

the embodiment of the utility model provides a large-traffic swing gas self-closing valve, the self-closing valve includes backpressure chamber, valve pocket; further comprising: a pressure regulating assembly that reciprocates with a difference in force between the back pressure chamber and the valve chamber; the magnet is magnetically attracted with the bottom of the pressure adjusting component; a pushing part disposed below the magnet; a limiting part for limiting the pushing part to move up and down; the pushing part is used for pushing a firing pin which is rotatably arranged in the valve cavity; a clamping part is arranged at the end part of the firing pin; a rotary opening type cover plate is rotatably connected in the valve cavity, and a rolling piece matched with the clamping part is arranged on the surface of the rotary opening type cover plate; when the pressure adjusting assembly does not apply force to the firing pin, the firing pin is in a horizontal position, and the rolling piece is connected with the clamping part in a clamping manner; when the pressure adjusting assembly applies force to the firing pin, the firing pin drives the clamping portion to rotate, the rolling piece rolls to be separated from the clamping portion, and the swing cover plate seals the valve cavity.

Further, the pressure regulating assembly includes: a pull rod; the end part of the pull rod is fixedly connected with a detection lifting button; the valve opening lifting button is clamped with the detection lifting button in the circumferential direction of the detection lifting button, and a magnetic part magnetically attracted with the magnet is arranged at the other end of the pull rod; a leather membrane is fixedly connected to the side wall of the middle part of the pull rod; the self-closing valve is divided into two independent cavities by the leather membrane, the cavity above the leather membrane is the back pressure cavity, and the cavity below the leather membrane is the valve cavity.

Further, a return spring is arranged at the axis position of the valve opening lifting button; one end of the return spring is fixed on the self-closing valve, and the other end of the return spring is fixed at the bottom of the valve opening lifting button.

Furthermore, a magnetic substance magnetically attracted with the magnet is arranged on the top surface of the limiting part, and the pushing part penetrates through the limiting part; the cross section of the pushing part is T-shaped; the bottom of the limiting part is provided with a T-shaped groove; the pushing part is clamped with the T-shaped groove; the magnet is fixed at the end part of the pushing part and is positioned above the limiting part; the width of the magnet is larger than that of the pushing part; the magnet is magnetically attracted with the magnetic substance.

Furthermore, a first rotating shaft is fixedly arranged in the valve cavity, and the firing pin is rotatably connected with the first rotating shaft; the section of the clamping part is U-shaped; one end part of the clamping part is fixedly connected with the firing pin; the opening of the clamping part is positioned below the firing pin; the rolling piece is clamped with the side wall below the clamping portion.

Further, the striker and the clamping portion are of an integrally formed structure.

Furthermore, a second rotating shaft is rotatably arranged in the valve cavity and fixedly connected with the end part of the swing cover plate.

The manual rotary knob comprises a manual rotary shaft, a manual connecting shaft arranged at one end of the manual rotary shaft, a manual sealing seat used for sealing the position between the manual connecting shaft and the end of the second rotary shaft, and a manual spring positioned between the manual connecting shaft and the manual sealing seat; the manual connecting shaft is in sliding sleeve joint with the manual sealing seat; the manual rotating shaft is fixedly connected with the manual connecting shaft; the end part of the second rotating shaft is provided with a transmission hole, the other end part of the manual rotating shaft is provided with a transmission part, and when the manual connecting shaft is pressed, the transmission part is connected with the transmission hole in a clamping mode.

Furthermore, the swing cover plate comprises a centering valve seat which is fixedly connected with the second rotating shaft and has an L-shaped cross section, and a centering ball head is arranged on the surface of the centering valve seat, which is used for closing a passage of the valve cavity; a connecting rod of the centering ball head penetrates through the centering valve seat, a limiting head is arranged at the end part, located on the left side of the centering valve seat, of the connecting rod, and a centering spring is fixedly connected between the limiting head and the centering valve seat; and a sealing gasket is covered and arranged on the surface of the centering ball head.

Further, the rolling member is a bearing, and the magnet is a permanent magnet.

The embodiment of the utility model provides a large-flow rotary-opening gas self-closing valve, which comprises a back pressure cavity, a valve cavity and a gas circuit channel; further comprising: a pressure regulating assembly that reciprocates with a difference in force between the back pressure chamber and the valve chamber; the magnet is magnetically attracted with the bottom of the pressure regulating component; a pushing part arranged below the magnet; a limiting part for limiting the up-and-down movement of the pushing part; the pushing part is used for pushing a firing pin which is rotatably arranged in the valve cavity; the end part of the firing pin is provided with a clamping part; a rotary opening type cover plate is rotationally connected in the valve cavity, and a rolling piece matched with the clamping part is arranged on the surface of the rotary opening type cover plate; when the pressure adjusting assembly does not apply force to the firing pin, the firing pin is in a horizontal position, and the rolling piece is connected with the clamping part in a clamping manner; when the pressure regulating assembly applies force to the striker, the striker drives the clamping portion to rotate, the rolling piece rolls to separate from the clamping portion, and the swing cover plate seals the air path channel.

In practical application, when the gas pressure is lower (lower than a set value), the effective acting force of the gas in the valve cavity acting on the pressure regulating assembly is smaller than the magnetic force between the lower end face of the magnet and the limiting portion, the pressure regulating assembly moves downwards under the action of the acting force, the magnet is attracted to the limiting portion, the magnet drives the pushing portion arranged below the magnet to push the striker to move downwards, balance of the striker is damaged, the striker rotates anticlockwise, the rolling piece rolls and slides out from the clamping portion, the swing-type cover plate quickly falls under the action of the gravity force and seals the gas channel, the swing-type cover plate effectively seals the gas channel under the action of the gas pressure, the gas channel is automatically cut off, and the under-pressure closing function is realized. When the gas pressure is higher (higher than a set value), the effective acting force of the gas in the valve cavity acting on the pressure regulating assembly is larger than the magnetic force between the upper end face of the magnet and the bottom of the pressure regulating assembly, the pressure regulating assembly moves upwards under the action of the resultant force, the magnetic attraction between the magnet and the limiting part is larger than the magnetic attraction between the magnet and the bottom of the pressure regulating assembly, the magnet is attracted to the limiting part, the magnet drives the pushing part arranged below the magnet to push the striker to move downwards, the balance of the striker is damaged, the striker rotates anticlockwise, the rolling part rolls and slides out from the clamping part, the swing-type cover plate quickly falls under the action of the gravity force and seals the gas channel, the swing-type cover plate effectively seals the gas channel under the action of the gas pressure, the gas channel is automatically cut off, and the overpressure closing function. Adopt the utility model provides a large-traffic swing formula gas self-closing valve adopts the gas circuit passageway that the self-closing valve was sealed to the swing formula apron, and the back is opened in the rotation of swing formula apron, and the gas circuit passageway of self-closing valve is opened completely, does not have any hindrance, can realize the flow maximize.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below.

Fig. 1 is a schematic structural view of a large-flow swing gas self-closing valve provided by an embodiment of the present invention.

Fig. 2 is a schematic structural view of a connection between a manual knob and a second rotating shaft according to an embodiment of the present invention.

Fig. 3 is a schematic structural diagram of a pressure adjustment assembly according to an embodiment of the present invention.

Fig. 4 is a schematic structural diagram of a swing-open cover plate according to an embodiment of the present invention.

Fig. 5 is a schematic view of a partial structure of a large-flow swing gas self-closing valve provided by an embodiment of the present invention.

Fig. 6 is a schematic structural diagram of a manual knob according to an embodiment of the present invention.

Fig. 7 is a schematic structural diagram of another manual knob according to an embodiment of the present invention.

Fig. 8 is a schematic structural diagram of the self-closing valve according to the embodiment of the present invention when the self-closing valve is opened.

Fig. 9 is a schematic structural diagram of the self-closing valve provided by the embodiment of the invention when closed.

Fig. 10 is a schematic cross-sectional view of a pressure adjustment assembly according to an embodiment of the present invention.

Reference numerals:

the device comprises a back pressure cavity 1, a valve cavity 2, an air passage 3, a magnet 4, a pushing part 5, a limiting part 6, a striker 7, a clamping part 8, a rotary opening cover plate 9, a rolling element 10, a pull rod 11, a valve opening lifting button 12, a limiting boss 13, a leather diaphragm 14, a return spring 15, a nut 16, a T-shaped groove 17, a first rotating shaft 18, a second rotating shaft 19, a sealing gasket 20, a manual rotating shaft 21, a manual connecting shaft 22, a manual sealing seat 23, a manual spring 24, a transmission hole 25, a transmission part 26, a detection lifting button 27, a centering ball head 28, a centering valve seat 29, a limiting head 30 and a centering spring 31.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail with reference to the accompanying drawings. It is obvious that the described embodiments are only some of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts all belong to the protection scope of the present invention.

It should be noted that the technical standards of the gas self-closing valve are as follows:

1) nominal pressure PN: 2KPa/5KPa, nominal diameter DN: 50 mm;

2) medium: (T) natural gas;

3) mounting positions: after the pressure regulator and before the gas boiler;

4) rated flow rate: not less than 65m 3/h;

5) interface size: a flange connection (DN 50);

6) product auto-close performance:

a) overpressure automatic closing pressure: 8kPa +/-2 kPa;

b) under-pressure auto-close pressure: 0.8kPa +/-0.2 kPa;

c) closing time: less than or equal to 3 s.

Example 1

Referring to fig. 1 to 10, an embodiment of the present invention provides a high flow rotary gas self-closing valve, which includes a back pressure chamber 1, a valve chamber 2, and a gas path channel 3; further comprising: the pressure regulating component moves back and forth along with the difference of acting force between the back pressure cavity 1 and the valve cavity 2; a magnet 4 magnetically attracted with the bottom of the pressure regulating component; a pushing portion 5 disposed below the magnet 4; a limiting part 6 for limiting the up-and-down movement of the pushing part 5; the pushing part 5 is used for pushing a firing pin 7 which is rotatably arranged in the valve cavity 2; a clamping part 8 is arranged at the end part of the firing pin 7; a swing cover plate 9 is rotatably connected in the valve cavity 2, and a rolling piece 10 matched with the clamping part 8 is arranged on the surface of the swing cover plate 9; when the pressure adjusting assembly does not apply force to the striker 7, the striker 7 is in a horizontal position, and the rolling member 10 is connected with the clamping portion 8 in a clamping manner; when the pressure adjusting assembly applies force to the firing pin 7, the firing pin 7 drives the clamping portion 8 to rotate, the rolling piece 10 rolls to be separated from the clamping portion 8, and the swing cover plate 9 seals the air path channel 3.

In practical application, when the gas pressure is lower (lower than a set value), the effective acting force of the gas in the valve cavity 2 acting on the pressure regulating assembly is smaller than the magnetic force between the lower end face of the magnet 4 and the limiting portion 6, the pressure regulating assembly moves downwards under the action of the acting force, the magnet 4 is attracted to the limiting portion 6, the magnet 4 drives the pushing portion 5 arranged below the magnet 4 to push the striker 7 to move downwards, the balance of the striker 7 is damaged, the striker 7 rotates anticlockwise, the rolling piece 10 rolls and slides out from the clamping portion 8, the swing type cover plate 9 falls down quickly under the action of gravity, the gas channel 3 is sealed, the swing type cover plate 9 effectively seals the gas channel 3 under the action of the gas pressure, the gas channel is cut off automatically, and the under-pressure closing function is realized. When the gas pressure is higher (higher than the set value), the effective acting force of the gas in the valve cavity 2 acting on the pressure regulating component is larger than the magnetic force between the upper end surface of the magnet 4 and the bottom of the pressure regulating component, the pressure adjusting component moves upwards under the action of the resultant force, the magnetic attraction between the magnet 4 and the limiting part 6 is larger than the magnetic attraction between the magnet 4 and the bottom of the pressure adjusting component, the magnet 4 is sucked on the limiting part 6, at the moment, the magnet 4 drives the pushing part 5 arranged below the magnet 4 to push the firing pin 7 to move downwards, the balance of the firing pin 7 is destroyed, the firing pin 7 rotates anticlockwise, the rolling piece 10 rolls and slides out from the clamping part 8, the rotary opening type cover plate 9 falls down quickly under the action of the gravity force and seals the air passage 3, under the action of gas pressure, the swing cover plate 9 effectively seals the gas passage 3, the gas passage is automatically cut off, and the overpressure closing function is realized. Adopt the utility model provides a large-traffic swing formula gas self-closing valve adopts swing formula apron 9 to seal gas circuit passageway 3, and swing formula apron 9 is rotatory to be opened the back, and 3 passageways of gas circuit passageway are opened completely, do not have any hindrance, can realize the flow maximize.

Example 2

On the basis of the above embodiment 1, this embodiment will further describe the scheme in detail with reference to fig. 1 to 9, which is as follows:

in one embodiment, referring to fig. 3, the pressure regulating assembly comprises: a pull rod 11; a detection lifting button 27 is fixedly connected to the end part of the pull rod 11; a valve opening lifting button 12 clamped with the detection lifting button is arranged in the circumferential direction of the detection lifting button, and a magnetic part magnetically attracted with the magnet is arranged at the other end of the pull rod 11; a leather membrane 14 is fixedly connected to the side wall of the middle part of the pull rod 11; the self-closing valve is divided into two independent cavities by the membrane 14, the cavity above the membrane 14 is the back pressure cavity 1, and the cavity below the membrane 14 is the valve cavity 2. As shown in fig. 10, the pull rod 11 and the film 14 may be fixedly connected by providing a limit boss 13 on a side wall of the pull rod 11, providing an external thread at a corresponding position, inserting the pull rod 11 through the film 14, engaging a bottom surface of the film 14 with the limit boss 13, and tightening the film 14 with a nut 16 to fixedly connect the pull rod 11 and the film 14.

The diaphragm 14 is used as a pressure sensing element, the permanent magnet 4 is used as a power element, the pull rod 11 and the limiting part 6 are metal attracting elements, the pushing part 5 is a transmission element, the striker 7 is a transmission output element, balance is formed by gas pressure of gas on the diaphragm 14 and suction of the permanent magnet 4 on metals at two ends, and when the gas in the gas path channel 3 is in overpressure or underpressure, the balance can be destroyed, so that the striker 7 is driven to destroy the balance of the swing cover plate 9, and the functions of automatically closing the self-closing valve in underpressure, overpressure and overcurrent are realized.

In one embodiment, a return spring 15 is arranged at the axial position of the valve opening lifting knob 12; one end of the return spring 15 is fixed on the self-closing valve, and the other end of the return spring is fixed at the bottom of the valve opening lifting button 12.

In one embodiment, referring to fig. 3, a magnetic material magnetically attracted to the magnet 4 is disposed on a top surface of the position-limiting portion 6, and the pushing portion 5 penetrates through the position-limiting portion 6; the section of the pushing part 5 is T-shaped; the bottom of the limiting part 6 is provided with a T-shaped groove 17; the pushing part 5 is clamped with the T-shaped groove 17; the magnet 4 is fixed at the end part of the pushing part 5, and the magnet 4 is positioned above the limiting part 6; the width of the magnet 4 is larger than that of the pushing part 5; the magnet 4 is magnetically attracted with the magnetic substance.

In one embodiment, referring to fig. 1, a first rotating shaft 18 is fixedly disposed in the valve chamber 2, and the striker 7 is rotatably connected to the first rotating shaft 18; the cross section of the clamping part 8 is U-shaped; one end of the clamping part 8 is fixedly connected with the firing pin 7; the opening of the clamping part 8 is positioned below the firing pin 7; the rolling member 10 is clamped with the lower side wall of the clamping part 8.

A swing type opening structure is adopted, so that a gas flow passage is completely unobstructed after a valve is opened, and large-flow gas transmission is realized; the structure is integrated with the control combination of the magnet 4 and the membrane 14, so that the overpressure valve closing and the underpressure valve closing are realized, the service life is long, and the performance is stable and reliable; the firing pin 7 and the clamping portion 8 are arranged on the principle of a lever (rocker), and the bearing is added to jointly combine into the locking mechanism, so that the structure is labor-saving, the locking is reliable, and the unlocking is sensitive.

In one embodiment, the striker 7 and the latch portion 8 are integrally formed.

The firing pin 7 and the clamping portion 8 are of an integrated structure, a lever system is formed by the firing pin 7 and a bearing, balance of a valve opening state is formed, rolling friction between the bearing and the side wall of the clamping portion 8 is adopted, when the pushing portion 5 impacts the firing pin 7, balance of the integrated structure can be sensitively damaged, and at the moment, the bearing rolls off from the side wall of the clamping portion 8; and the quick closing of the valve seat valve is realized.

In one embodiment, please refer to fig. 6, a second rotating shaft 19 is rotatably disposed in the valve chamber 2, and the second rotating shaft 19 is fixedly connected to an end of the swing cover 9.

In a specific embodiment, please refer to fig. 6 and 7, further comprising a manual knob, wherein the manual knob comprises a manual rotation shaft 21, a manual connection shaft 22 disposed at one end of the manual rotation shaft 21, a manual sealing seat 23 for sealing between the manual connection shaft 22 and the end of the second rotation shaft 19, and a manual spring 24 located between the manual connection shaft 22 and the manual sealing seat 23; the manual connecting shaft 22 is in sliding sleeve joint with the manual sealing seat 23; the manual rotating shaft 21 is fixedly connected with the manual connecting shaft 22; a transmission hole 25 is formed in the end of the second rotating shaft 19, a transmission part 26 is arranged at the other end of the manual rotating shaft 21, and when the manual connecting shaft 22 is pressed, the transmission part 26 is connected with the transmission hole 25 in a clamping mode.

By adopting a clutch structure mode, when the valve is opened, the manual knob is manually pressed down to enable the manual rotating shaft 21 to be meshed with the second rotating shaft 19, then the manual rotating shaft is rotated by 94 degrees clockwise to drive the swing type cover plate 9 to swing, the valve is opened, and the manual knob is automatically separated under the action of the manual spring 24 after the manual knob is opened, so that the sealing assembly is separated from the manual assembly, the friction force is reduced, and the valve is quickly closed.

In one embodiment, referring to fig. 4, the swing-open cover 9 includes a centering valve seat 29 having an "L" shape in cross section for fixedly connecting with the second rotating shaft 19, and a centering ball 28 is mounted on a surface of the centering valve seat 29 for closing the air passage channel 3; a connecting rod of the centering ball head 28 penetrates through the centering valve seat 29, a limiting head 30 is arranged at the end part of the connecting rod, which is positioned at the left side of the centering valve seat 29, and a centering spring 31 is fixedly connected between the limiting head 30 and the centering valve seat 29; the surface of the centering ball head 28 is covered with a sealing gasket 20. The automatic alignment of the sealing assembly is realized through the centering valve seat 29, the centering ball head 28 and the centering spring 31, the automatic close fitting of the sealing gasket 20 to the valve port is ensured, and meanwhile, the self-tightening sealing mode is adopted, so that the larger the inlet pressure is, the better the sealing performance is.

In one embodiment, the rolling elements 10 are bearings and the magnets 4 are permanent magnets.

The embodiment of the utility model provides a large-flow rotary-opening gas self-closing valve, which comprises a back pressure cavity 1, a valve cavity 2 and a gas circuit channel 3; further comprising: the pressure regulating component moves back and forth along with the difference of acting force between the back pressure cavity 1 and the valve cavity 2; a magnet 4 magnetically attracted with the bottom of the pressure regulating component; a pushing portion 5 disposed below the magnet 4; a limiting part 6 for limiting the up-and-down movement of the pushing part 5; the pushing part 5 is used for pushing a firing pin 7 which is rotatably arranged in the valve cavity 2; a clamping part 8 is arranged at the end part of the firing pin 7; a swing cover plate 9 is rotatably connected in the valve cavity 2, and a rolling piece 10 matched with the clamping part 8 is arranged on the surface of the swing cover plate 9; when the pressure adjusting assembly does not apply force to the firing pin 7, the firing pin 7 is in a horizontal position, and the rolling piece 10 is connected with the clamping part 8 in a clamping manner; when the pressure adjusting assembly applies force to the firing pin 7, the firing pin 7 drives the clamping portion 8 to rotate, the rolling piece 10 rolls to be separated from the clamping portion 8, and the swing cover plate 9 seals the air channel 3.

Before use, the valve needs to be opened; rated working pressure is introduced into the inlet of the valve, the working pressure can be set by a user, and when the valve is in a closed state, the permanent magnet is attracted to the limiting plate and must be opened manually; the valve lifting knob 12 is pulled manually to be released after limiting, the detection lifting knob 27 is lifted to display that the valve can be opened manually, the permanent magnet is separated from the limiting part 6, the leather membrane 14 overcomes the suction force of the permanent magnet under the pushing of air pressure to drive the firing pin 7 to be kept fixed at the limiting position under the action of the limiting part 6, and at the moment, one end of the rocker of the firing pin 7, which is provided with the clamping part 8, rotates to the horizontal position around the fixed shaft under the action of eccentric gravity; then the manual knob is pressed down, at the moment, the transmission part 26 arranged at the end part of the manual rotating shaft 21 is automatically meshed into the transmission hole 25 of the second rotating shaft 19, as an optimal mode, the transmission part 26 and the transmission hole 25 are matched in a wedge shape, and then the manual knob is rotated to a limit position (about 94 degrees) along the direction of the mark on the manual knob, at the moment, the rotary opening type cover plate 9 is driven to be opened in a rotating mode, the bearing on the rotary opening type cover plate 9 is automatically clamped into the side wall of the clamping part 8, as an optimal implementation mode, a groove is arranged at the clamping part 8 of the clamping part 8 and the rolling part 10, and when the rolling part 10 is clamped with the clamping part 8, the rolling part 10 is positioned in the groove; at this time, the swing cover 9 is locked and held, and the valve is opened and held, and the manual connection shaft 22 and the manual knob are automatically ejected by the manual spring 24, so that the transmission part 26 is disengaged from the transmission hole 25.

When the gas pressure is low (lower than a set value), the effective acting force of the gas acting on the membrane 14 is smaller than the magnetic force between the lower end face of the permanent magnet and the limiting part 6, the membrane 14 moves downwards under the action of the resultant force, the permanent magnet is attracted to the top face of the limiting part 6 and drives the pushing part 5 to push the striker 7 to move downwards, the striker 7 moves downwards to destroy the balance of the striker 7, so that the striker 7 rotates anticlockwise around the first rotating shaft 18, the bearing slides out from the groove of the clamping part 8 in a rolling manner, and the swing type cover plate 9 falls down quickly under the action of gravity; at this moment, the swing type cover plate 9 is sealed in the air passage channel 3, the sealing gasket 20 is effectively sealed under the common action of gas pressure and torsional spring pretightening force, the gas passage is automatically cut off, and the under-pressure closing function is realized.

When the gas pressure is high (higher than a set value), the effective acting force of the gas acting on the membrane 14 is larger than the magnetic force between the upper end face of the permanent magnet and the magnetic part at the bottom of the pull rod 11, the membrane 14 and the pull rod 11 move upwards under the action of the resultant force, the permanent magnet falls back and is attracted on the limiting part 6 and drives the pushing part 5 to push the striker 7 to move downwards, the striker 7 moves downwards to break the balance of the striker 7, so that the striker 7 rotates anticlockwise around the first rotating shaft 18, the bearing rolls and slides out from the groove of the clamping part 8, and the swing cover plate 9 falls down quickly under the action of gravity; at the moment, the swing type cover plate 9 is sealed in the gas path channel 3, the sealing gasket 20 is effectively sealed under the common action of gas pressure and torsional spring pretightening force, the gas path is automatically cut off, and the overpressure closing function is realized.

The utility model provides a large-flow swing gas self-closing valve, which is arranged on a low-pressure gas system pipeline and in front of a gas boiler, and has the functions of overpressure automatic closing, under-pressure automatic closing, overcurrent automatic closing, user autonomous detection and the like; when the gas supply is abnormal, the valve is automatically closed to prevent gas leakage. The self-closing valve does not use external power when being closed, needs to be manually opened after being closed, can automatically work for a long time, is safe and reliable, has clear working state, is easy to troubleshoot faults, and is convenient to install and operate. The self-closing valve adopts a swing type valve core opening mode, and after the valve is rotated and opened, the medium channel is completely opened without any obstruction, so that the flow maximization can be realized.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims (10)

1. A high-flow rotary-opening type gas self-closing valve comprises a back pressure cavity and a valve cavity; it is characterized by also comprising: a pressure regulating assembly that reciprocates with a difference in force between the back pressure chamber and the valve chamber; the magnet is magnetically attracted with the bottom of the pressure adjusting component; a pushing part disposed below the magnet; a limiting part for limiting the pushing part to move up and down; the pushing part is used for pushing a firing pin which is rotatably arranged in the valve cavity; a clamping part is arranged at the end part of the firing pin; a rotary opening type cover plate is rotatably connected in the valve cavity, and a rolling piece matched with the clamping part is arranged on the surface of the rotary opening type cover plate; when the pressure adjusting assembly does not apply force to the firing pin, the firing pin is in a horizontal position, and the rolling piece is connected with the clamping part in a clamping manner; when the pressure adjusting assembly applies force to the firing pin, the firing pin drives the clamping portion to rotate, the rolling piece rolls to be separated from the clamping portion, and the swing cover plate seals the valve cavity.

2. The high flow swing gas self-closing valve according to claim 1, wherein the pressure regulating assembly comprises: a pull rod; the end part of the pull rod is fixedly connected with a detection lifting button; the valve opening lifting button is clamped with the detection lifting button in the circumferential direction of the detection lifting button, and a magnetic part magnetically attracted with the magnet is arranged at the other end of the pull rod; a leather membrane is fixedly connected to the side wall of the middle part of the pull rod; the self-closing valve is divided into two independent cavities by the leather membrane, the cavity above the leather membrane is the back pressure cavity, and the cavity below the leather membrane is the valve cavity.

3. The high-flow rotary-opening gas self-closing valve according to claim 2, wherein a return spring is arranged at the axial position of the valve opening lifting button; one end of the return spring is fixed on the self-closing valve, and the other end of the return spring is fixed at the bottom of the valve opening lifting button.

4. The high-flow swing gas self-closing valve according to claim 1, wherein a magnetic substance magnetically attracted with the magnet is arranged on the top surface of the limiting part, and the pushing part penetrates through the limiting part; the cross section of the pushing part is T-shaped; the bottom of the limiting part is provided with a T-shaped groove; the pushing part is clamped with the T-shaped groove; the magnet is fixed at the end part of the pushing part and is positioned above the limiting part; the width of the magnet is larger than that of the pushing part; the magnet is magnetically attracted with the magnetic substance.

5. The high-flow rotary-opening gas self-closing valve according to claim 1, wherein a first rotating shaft is fixedly arranged in the valve cavity, and the firing pin is rotatably connected with the first rotating shaft; the section of the clamping part is U-shaped; one end part of the clamping part is fixedly connected with the firing pin; the opening of the clamping part is positioned below the firing pin; the rolling piece is clamped with the side wall below the clamping portion.

6. The high-flow swing gas self-closing valve according to claim 5, wherein the striker and the clamping portion are of an integrally formed structure.

7. The high-flow swing gas self-closing valve according to claim 1, characterized in that a second rotating shaft is rotatably arranged in the valve cavity and fixedly connected with the end of the swing cover plate.

8. The high-flow swing gas self-closing valve according to claim 7, further comprising a manual knob, wherein the manual knob comprises a manual rotating shaft, a manual connecting shaft arranged at one end of the manual rotating shaft, a manual sealing seat used for sealing between the manual connecting shaft and the end of the second rotating shaft, and a manual spring positioned between the manual connecting shaft and the manual sealing seat; the manual connecting shaft is in sliding sleeve joint with the manual sealing seat; the manual rotating shaft is fixedly connected with the manual connecting shaft; the end part of the second rotating shaft is provided with a transmission hole, the other end part of the manual rotating shaft is provided with a transmission part, and when the manual connecting shaft is pressed, the transmission part is connected with the transmission hole in a clamping mode.

9. The high-flow swing gas self-closing valve according to claim 7, wherein the swing cover plate comprises a centering valve seat which is used for being fixedly connected with the second rotating shaft and has an L-shaped cross section, and a centering ball head is mounted on the surface of the centering valve seat, which is used for closing the passage of the valve cavity; a connecting rod of the centering ball head penetrates through the centering valve seat, a limiting head is arranged at the end part, located on the left side of the centering valve seat, of the connecting rod, and a centering spring is fixedly connected between the limiting head and the centering valve seat; and a sealing gasket is covered and arranged on the surface of the centering ball head.

10. The high flow swing gas self-closing valve according to claim 1, wherein the rolling member is a bearing and the magnet is a permanent magnet.

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