CN116428518A - Bottled gas high-pressure end emergency cut-off valve and combined valve - Google Patents

Abstract

The invention provides an emergency cut-off valve and a combined valve for a high-pressure end of bottled gas, and belongs to the technical field of valves. The gas leakage preventing device solves the problem that gas cannot be prevented from leaking outwards from a pressure reducing valve of gas leakage when emergency cutting-off occurs. The bottled gas high-pressure end emergency cut-off valve comprises a valve body transversely provided with a gas passing channel and a top rod vertically arranged in the valve body, an annular sealing seat is arranged in the gas passing channel, an action spring and a sealing piece which is spherical and located below the top rod are further arranged in the gas passing channel, one end, closer to the gas passing channel, of the two ends of the action spring is limited in the gas passing channel, the other end of the action spring is abutted against the sealing piece, a tapered guide surface is arranged in an orifice of one end of the sealing seat, the sealing piece is abutted against the orifice of the end of the sealing seat, and a yielding gap is formed between the sealing piece and the inner wall of the valve body along the axial direction of the top rod. The gas leakage control valve has the advantages that the problem that gas cannot be prevented from leaking outwards from the pressure reducing valve when the gas leakage control valve is in emergency cut-off can be effectively solved.

Description

Bottled gas high-pressure end emergency cut-off valve and combined valve

Technical Field

The invention belongs to the technical field of valves, and relates to an emergency cut-off valve and a combined valve for a high-pressure end of bottled gas.

Background

The gas valve for controlling the on-off of the pipeline is arranged on the existing gas pipeline, meanwhile, the gas concentration detector is arranged indoors for safety, and when gas leakage occurs, the gas concentration detector detects that the indoor gas concentration exceeds a set value and gives an alarm to inform people to close the gas valve. However, in practice, an unmanned state often occurs indoors or when indoor personnel are busy with other events, an alarm signal cannot be received timely, so that a gas valve cannot be closed timely, and further a gas explosion accident is caused or a gas poisoning event of a user is caused.

In order to solve the problems, china patent discloses a household electromagnetic gas emergency shut-off valve with the patent application number of 201620700707.8, which comprises a valve body, a valve rod, a sealing block, a reset spring and a magnetic control device; the valve rod is arranged in the valve body and can move up and down in the valve body, the sealing block is arranged in the valve body and positioned at a control port in the valve body and used for sealing the control port of the valve body, the sealing block is fixedly arranged at one end of the valve rod positioned in the valve body and can drive the sealing block to move up and down through the movement of the valve rod, and a button handle is arranged at one end of the valve rod positioned outside the valve body; the reset spring is sleeved on the valve rod, the upper end of the reset spring is fixed on the valve body, and the lower end of the reset spring is fixed on the sealing block; the magnetic control device is arranged in the valve body and sleeved on the valve rod, and comprises an electromagnet, a permanent magnet, an iron core and a driving circuit, wherein the iron core is sleeved and fixedly arranged on the valve rod, the permanent magnet is fixed in the valve body and positioned at the upper end of an opening of the valve body where the valve rod is arranged, and the electromagnet is arranged in the valve body and sleeved with the permanent magnet; the driving circuit is connected with the electromagnet and used for controlling the on-off of the electromagnet, the driving circuit comprises a power supply, a capacitor, a protection resistor and a detection switch, the positive end of the capacitor is connected with the positive electrode of the power supply, the negative end of the capacitor is connected with the negative electrode of the power supply, the protection resistor is connected between the positive end of the capacitor and the positive electrode of the power supply in series, the electromagnet is connected with the capacitor in parallel, the detection switch is connected between the electromagnet and the capacitor in series, and when the electromagnet is electrified, the magnetic poles of the electromagnet are opposite to the magnetic poles of the permanent magnet. When the valve is opened, the button handle is lifted upwards through manual operation, so that the button handle drives the valve rod to move upwards, the sealing block is separated from the control port in the valve body, the valve is opened, then the iron core on the valve rod moves upwards to contact with the permanent magnet, the iron core is adsorbed on the permanent magnet through the magnetic force of the permanent magnet, and the condition that the valve rod moves downwards due to the elastic force of the reset spring is avoided; when gas leaks, the detection switch is closed after receiving a detection signal of the gas detector, so that the power supply charges the coil of the electromagnet rapidly for the electric quantity stored in the capacitor, the electromagnet rapidly generates electromagnetic force and is used for counteracting the magnetic force of the permanent magnet, the attraction of the permanent magnet to the iron core disappears, the sealing block is moved downwards to seal the control port of the valve body under the action of the elastic force of the reset spring, and the valve is closed. The household electromagnetic gas emergency cut-off valve can automatically cut off a gas passage when gas leakage occurs indoors, so that the gas is prevented from continuously leaking.

However, the household electromagnetic gas emergency shut-off valve has the following defects: the direction of the return spring acting on the sealing block is opposite to the direction of the fuel gas passing through the control port (according to the drawing in the specification, the elastic force of the return spring is downwards applied on the sealing block, and the direction of the fuel gas passing through the control port is upwards), namely the fuel gas can form resistance to the closing of the control port by the sealing block, which results in that the household electromagnetic fuel gas emergency cut-off valve can only be connected to the rear end of the pressure reducing valve for use (the pressure reducing valve is directly connected to the outlet of the liquefied gas steel cylinder, the outlet pressure of the liquefied gas steel cylinder is large, and the pressure can be reduced by the pressure reducing valve to ensure the safety). In practice, the pressure reducing valve may leak air due to failure of the sealing portion, but since the electromagnetic gas emergency shut-off valve is connected to the rear end of the pressure reducing valve, it can only shut off the gas passage at the rear end of the pressure reducing valve, but cannot prevent the gas from leaking out from the pressure reducing valve.

Disclosure of Invention

The invention aims to solve the problems in the prior art, and provides an emergency cut-off valve and a combined valve for a high-pressure end of bottled gas, which solve the problem that the gas cannot be prevented from leaking outwards from a pressure reducing valve of gas leakage during emergency cut-off.

The aim of the invention can be achieved by the following technical scheme:

the utility model provides an emergent trip valve of bottled gas high pressure end, is including the valve body that is provided with the gas passage and the ejector pin of vertical setting in the valve body, valve body lateral part still be connected with can drive the ejector pin and reciprocate and move the actuating mechanism who fixes a position it after the ejector pin is in place, its characterized in that, the gas passage along transversely setting up and being provided with annular sealing seat in it, still be provided with along the action spring of transverse arrangement and be globular and be located the sealing member of ejector pin below in the gas passage, the one end that is closer to the gas passage air inlet position in the both ends of action spring is spacing in the gas passage and its other end supports and leans on the sealing member, has the guide surface of taking the tapering and sealing member supports and lean on this end hole mouth department of sealing seat in the one end drill way of sealing member, the sealing member is followed the axial of ejector pin has the clearance of stepping down for between the valve body inner wall.

This emergent trip valve of bottled gas high pressure end sets up the gas passageway along horizontal setting and sets up action spring, be spheroidal sealing member and annular sealing seat in the gas passageway that passes, and action spring is close to the one end of gas passageway air inlet position and is spacing in the gas passageway that passes, and the other end of action spring supports and leans on the sealing member, and the sealing member supports and leans on the one end drill way department of sealing seat, and because the sealing member is located the below of ejector pin, will promote the sealing member and produce the displacement along the vertical direction of ejector pin on the sealing seat when the ejector pin moves down like this. When normal air supply is needed, the driving mechanism drives the ejector rod to move downwards (the ejector rod is positioned by the driving mechanism after moving downwards in place), so that the sealing element is displaced at the orifice of the sealing seat, the sealing element is offset from the center line of the sealing seat, and at the moment, the orifice of the end of the sealing seat is not blocked by the sealing element, so that air can pass through. When air leakage occurs in a room, the driving mechanism controls the ejector rod to move upwards to be separated from the sealing element, and one end of the acting spring is abutted against the sealing element, and the inner side of the end hole of the sealing seat is provided with a tapered guide surface, so that the sealing element can return to move into the end hole of the sealing seat and be blocked under the cooperation of the acting spring and the guide surface, thereby realizing emergency cutting to prevent air from continuing to leak outwards from the rear air leakage position. Through such setting for the emergent shut-off of this bottled gas high pressure end emergency shut-off valve receives less by the influence of pressure, this means the emergent shut-off valve of this bottled gas high pressure end can direct connection in the exit of liquefied gas steel bottle and with the rear of relief pressure valve connection at this bottled gas high pressure end emergency shut-off valve, thereby no matter the outward leakage of gas from the rear side pipeline or the outward leakage of gas from relief pressure valve department can all be effectively prevented when emergent shut-off, the problem that can't prevent the outward leakage of gas from the relief pressure valve department of gas leakage when emergent shut-off has been solved effectively.

Under the state that the central hole of the sealing seat is blocked, the elastic direction of the acting spring is the same as the conveying direction of the fuel gas in the gas passing channel, so that the sealing effect is better when the emergency cut-off is performed due to the fact that the pressure is larger, and the use reliability of the bottled fuel gas high-pressure end emergency cut-off valve directly connected to the outlet of the liquefied gas steel cylinder is improved. In addition, the action spring is arranged in the overair channel and is irrelevant to the driving mechanism, and even if the whole driving mechanism is damaged in the emergency cut-off state, the emergency cut-off state can not be invalid.

In the bottled gas high-pressure end emergency cut-off valve, a concave cavity which is concave towards the direction far away from the ejector rod is formed below the sealing piece on the inner wall of the valve body, the concave cavity forms the yielding gap, and a shoulder is formed at the joint of the inner wall of the concave cavity and the inner wall of the valve body.

The shoulder formed by connecting the inner wall of the concave cavity with the inner wall of the valve body can be propped against the sealing element to limit the farthest displacement position of the sealing element, so that the situation that the sealing element cannot be driven to reset by the action spring to realize emergency cutting-off due to the fact that the sealing element is far displaced is avoided. In practice, the displacement of the sealing element under the pushing of the ejector rod is controlled to be smaller than the radius of the sealing element by controlling the moving distance of the ejector rod and matching with the arrangement of the position of the retaining shoulder.

In the bottled gas high-pressure end emergency cut-off valve, the acting spring is in a pagoda shape, one end with larger acting spring size is closer to the air inlet position of the air passing channel than the other end with smaller acting spring size, and the outer wall of the one end with larger acting spring size is clamped on the inner wall of the air passing channel.

Through setting up the action spring to be pagoda type and the great one end outer wall card of action spring size is on the inner wall of air passage, the great one end of action spring size can not lateral displacement or warp along vertical direction like this, just can form restoring force by the deformation of the less one end of sealing member drive action spring size when the ejector pin promotes the sealing member displacement.

In the bottled gas high-pressure end emergency cut-off valve, as another technical scheme, the action spring is cylindrical, the outer diameter of the action spring is smaller than the inner diameter of the gas passing channel, and one end of the action spring, which is closer to the gas inlet position of the gas passing channel, is welded and fixedly connected in the gas passing channel.

In the bottled gas high-pressure end emergency cut-off valve, the guide surface protrudes towards the central line of the sealing seat to form an arc shape.

In the bottled gas high-pressure end emergency cut-off valve, the valve body is provided with the air inlet and the air outlet, the air passing channel is positioned between the air inlet and the air outlet, the valve body is connected with the air inlet connector, one end of the air inlet connector is in threaded connection with the air inlet, one end of the acting spring is abutted against the end of the air inlet connector, the air inlet connector is sleeved with the connecting sleeve with external threads, the connecting sleeve is fixedly connected with the hand wheel, and the other end of the air inlet connector is sleeved with the sealing gasket.

Through the setting of air inlet joint, adapter sleeve and hand wheel for this bottled gas high pressure end emergent trip valve can be like the relief pressure valve that current bottled gas was used direct connection in the exit of liquefied gas steel bottle, and make the relief pressure valve connect the gas outlet at the valve body, no matter like this the pipeline of relief pressure valve rear end leaks or the relief pressure valve itself leaks, can both utilize this bottled gas high pressure end emergent trip valve to stop the continuation leakage of gas through emergent cutting off.

In the bottled gas high-pressure end emergency cut-off valve, the valve body on be connected with the disk seat, the ejector pin wears to establish in the disk seat, actuating mechanism includes electromagnetic control assembly and the reset spring who acts on the ejector pin towards keeping away from the sealing member direction, electromagnetic control assembly includes the mount pad of threaded connection on the disk seat, be fixed in the coil in the mount pad and all be located the inboard iron core of coil and magnet, the iron core slides along vertical direction and sets up and the iron core offsets with the ejector pin and lean on, can be held by magnet when the iron core moves towards the direction that is close to the sealing member.

When the bottled gas high-pressure end emergency cut-off valve is in a closed state, the ejector rod is in a state of being separated from the sealing piece, and the iron core is in a magnetic force range far away from the magnet under the state. When the sealing seat is required to be opened, the iron core is manually pressed down, so that the iron core pushes the ejector rod to overcome the action of the return spring and move, and the ejector rod gradually pushes the sealing piece to roll and be far away from the central hole of the sealing seat; the iron core is sucked by the magnetic force of the magnet and kept still, so that the ejector rod is fixed after moving to a position, and the ejector rod can be always kept in a state of opening a central hole of the sealing seat by supporting the sealing element, thereby ensuring normal supply of fuel gas. When leakage occurs, the indoor gas concentration detector detects that the concentration of indoor gas exceeds a set value and controls the coil to be electrified, electromagnetic force generated after the coil is electrified can be propped against the magnetic force of the magnet, so that the iron core is not adsorbed by the magnet any more, and the ejector rod can reset and move under the action of the elastic force of the reset spring and reversely push the iron core to a position far away from the attraction of the magnet; the acting spring can reset under the self elastic force after the ejection of the ejector rod is lost and drives the sealing element to plug the central hole of the sealing seat, so that emergency cutting is realized; in an emergency cut-off state, the ejector rod is positioned at a position separated from the sealing element under the action of the elastic force of the return spring due to the fact that the iron core is far away from the suction range of the magnet.

In the bottled gas high-pressure end emergency cut-off valve, the magnet is annular and is positioned on one side of the iron core, which is closer to the ejector rod, a push rod which is not provided with magnetism and penetrates through the magnet is further arranged in the mounting seat, and two ends of the push rod are respectively abutted against the ejector rod and the iron core.

The magnet is located on one side of the iron core, which is closer to the ejector rod, so that the iron core can be attracted by the magnetic force of the magnet when moving towards the direction, which is close to the sealing element, and the ejector rod can overcome the action of the reset spring to keep the state of being propped against the sealing element. The push rod is used for transmitting acting force, and the push rod is not attracted by the magnet because the push rod is non-magnetic, so that the push rod cannot move.

In the bottled gas high-pressure end emergency cut-off valve, the outer side of one end of the ejector rod, which is abutted against the push rod, is provided with an annular shoulder, and two ends of the reset spring respectively act on the annular shoulder and the inner wall of the valve seat.

The combined valve comprises a pressure reducing valve and is characterized by further comprising the bottled gas high-pressure end emergency cut-off valve, wherein the bottled gas high-pressure end emergency cut-off valve is connected to the inlet end of the pressure reducing valve, and the outlet end of the pressure reducing valve is provided with a connecting part in a pagoda shape.

When the emergency cut-off valve for the bottled gas high-pressure end is connected to the inlet end of the pressure reducing valve, the emergency valve for the gas is directly installed and fixed at the outlet of the liquefied gas steel cylinder, and then a hose is connected to the outlet end of the pressure reducing valve. The (high pressure) gas in the liquefied gas steel cylinder directly enters the bottled gas high pressure end emergency cut-off valve, and then enters the pressure reducing valve for pressure reduction so as to stabilize the pressure in a lower pressure for supply. The pressure reducing valve is arranged at the rear end of the bottled gas high-pressure end emergency cut-off valve, so that no matter whether a pipeline at the rear end of the pressure reducing valve leaks or the pressure reducing valve leaks, the bottled gas high-pressure end emergency cut-off valve can be used for stopping gas from continuously leaking through emergency cutting off.

Compared with the prior art, the bottled gas high-pressure end emergency cut-off valve is characterized in that the gas passing channel is transversely provided with the action spring, the spherical sealing element and the annular sealing seat in the gas passing channel, the ejector rod is propped against the sealing element to generate vertical displacement to open the central hole of the sealing seat in a normal gas supply state, and when gas leakage occurs indoors, the driving mechanism controls the ejector rod to move and separate from the sealing element to enable the sealing element to return to move under the cooperation of the action spring and the guide surface to seal the central hole of the sealing seat so as to realize emergency cut-off, so that the emergency cut-off function of the bottled gas high-pressure end emergency cut-off valve is not influenced by the pressure of gas and can be directly connected between the outlet of the liquefied gas cylinder and the pressure reducing valve, and therefore, whether the gas leaks outwards from a rear square pipe or the pressure reducing valve can be effectively prevented during emergency cut-off, and the problem that the gas cannot leak outwards from the pressure reducing valve of the gas leakage is effectively solved during emergency cut-off.

Drawings

Fig. 1 is a schematic structural view of the bottled gas high-pressure end emergency shut-off valve.

Fig. 2 is a cross-sectional view of the bottled gas high pressure end emergency shut-off valve in an open state.

Fig. 3 is a cross-sectional view of the bottled gas high pressure end emergency shut-off valve in an emergency shut-off state.

Fig. 4 is a schematic diagram of a combination valve.

In the figure, 1, a valve body; 1a, an air inlet; 1b, an air outlet; 1c, a gas passing channel; 1d, annular partitions; 1e, concave cavity; 1f, a shoulder; 2. a push rod; 2a, an annular shoulder; 3. a sealing seat; 3a, a guide surface; 4. an action spring; 5. a seal; 6. an air inlet joint; 7. connecting sleeves; 8. a hand wheel; 9. a sealing gasket; 10. a valve seat; 10a, connectors; 11. an electromagnetic control assembly; 12. a return spring; 13. a mounting base; 14. a coil; 15. an iron core; 15a, an operation part; 16. a magnet; 17. a push rod; 18. an annular gasket; 19. a limiting gasket; 20. a seal ring; 21. a flat gasket; 22. a pressure reducing valve; 22a, a connection portion.

Detailed Description

The following are specific embodiments of the present invention and the technical solutions of the present invention will be further described with reference to the accompanying drawings, but the present invention is not limited to these embodiments.

Example 1

As shown in fig. 1, 2 and 3, the bottled gas high-pressure end emergency cut-off valve comprises a valve body 1 with an air inlet 1a and an air outlet 1b, and an air passing channel 1c which communicates the air inlet 1a with the air outlet 1b is arranged in the valve body 1. In this embodiment, the air passing channel 1c is arranged along the transverse direction, the air inlet 1a, the air outlet 1b and the air passing channel 1c are arranged on the same center line, an annular separation part 1d is arranged between the air outlet 1b and the air passing channel 1c in the valve body 1, an annular sealing gasket 18 is arranged in the air outlet 1b, and the annular sealing gasket 18 abuts against the annular separation part 1 d. The valve body 1 is connected with an air inlet joint 6, one end of the air inlet joint 6 is in threaded connection with the air inlet 1a, a connecting sleeve 7 with external threads is sleeved outside the air inlet joint 6, a hand wheel 8 is fixedly connected outside the connecting sleeve 7, and the other end of the air inlet joint 6 is sleeved with a sealing gasket 9. The valve body 1 is internally and vertically provided with a push rod 2, and the side part of the valve body 1 is connected with a driving mechanism which can drive the push rod 2 to move up and down and position the push rod 2 after moving in place. An annular sealing seat 3 is arranged in the gas passing channel 1c, the sealing seat 3 is a rubber piece in the embodiment, and the sealing seat 3 abuts against the annular separation part 1 d. The inside of the air passage 1c is also provided with an action spring 4 and a sealing piece 5 which are arranged along the transverse direction and are spherical and positioned below the ejector rod 2, one end, which is closer to the air inlet position of the air passage 1c, of the two ends of the action spring 4 is limited in the air passage 1c, the other end of the action spring 4 is abutted against the sealing piece 5, the outer diameter of the sealing piece 5 is larger than the inner diameter of one end of the sleeved action spring 4, a tapered guide surface 3a is arranged in an orifice of one end of the sealing seat 3, the guide surface 3a protrudes towards the central line of the sealing seat 3 to form an arc shape, the sealing piece 5 is abutted against the orifice of the end of the sealing seat 3, and a yielding gap is arranged between the sealing piece 5 and the inner wall of the valve body 1 along the axial direction of the ejector rod 2. Specifically, the action spring 4 is pagoda-shaped, and the larger one end of action spring 4 is closer to the air inlet position of the air passing channel 1c than the smaller one end of action spring 4, and the air passing channel 1c is round hole-shaped, and the larger one end of action spring 4 abuts against one end part of the air inlet 1a in threaded connection with the air inlet joint 6, and the outer wall of the larger one end of action spring 4 is clamped on the inner wall of the air passing channel 1c, and the smaller one end of action spring 4 is sleeved outside the sealing piece 5, and the outer diameter of the sealing piece 5 is larger than the inner diameter of the smaller one end of action spring 4. The acting spring 4 is in a pagoda shape, and when the ejector rod 2 pushes the sealing piece 5 to generate displacement, the smaller end of the acting spring 4 can be deformed under the condition that the larger end is clamped in the air passing channel 1c. In practice, the sealing element 5 is not firmly connected with the acting spring 4, i.e. simply abuts against it, so that the sealing element 5 can roll under the pushing of the ejector rod 2.

Further, as shown in fig. 2 and 3, the end of the ejector rod 2 close to the sealing member 5 is flat, a concave cavity 1e recessed towards the direction away from the ejector rod 2 is arranged below the sealing member 5 on the inner wall of the valve body 1, the concave cavity 1e forms the above-mentioned yielding gap, and a shoulder 1f is formed at the joint of the inner wall of the concave cavity 1e and the inner wall of the valve body 1. In practice, the displacement of the sealing element 5 generated by pushing the ejector rod 2 is controlled to be smaller than the radius of the sealing element 5 by controlling the moving distance of the ejector rod 2 and matching with the position setting of the stop shoulder 1f.

Further, as shown in fig. 1, 2 and 3, a valve seat 10 is connected to the valve body 1, and the plunger 2 is inserted into the valve seat 10. The driving mechanism comprises an electromagnetic control assembly 11 and a return spring 12 acting on the ejector rod 2 in the direction away from the sealing element 5, wherein the electromagnetic control assembly 11 comprises a mounting seat 13, a coil 14 and an iron core 15 and a magnet 16, wherein the mounting seat 13 is in threaded connection with the valve seat 10, the coil 14 is fixed in the mounting seat 13, the iron core 15 and the magnet 16 are both positioned on the inner side of the coil 14, the iron core 15 is arranged in a sliding mode in the vertical direction, one end of the iron core 15 abuts against the ejector rod 2, the other end of the iron core 15 extends out of the mounting seat 13 and is provided with an operation part 14a, the magnet 16 is strong in magnetism, when the iron core 15 moves in the direction close to the sealing element 5, the magnet 16 can absorb the electromagnetic force generated when the coil 14 is electrified, and the electromagnetic force generated when the coil 14 is electrified abuts against the magnetic force of the magnet 16. The magnet 16 is annular and is positioned on one side of the iron core 15, which is closer to the ejector rod 2, a flat gasket 21 propping against the magnet 16, which is positioned on one side of the iron core 15, is also arranged in the mounting seat 13, a push rod 17 which is not magnetic and penetrates through the magnet 16 is also arranged in the mounting seat 13, two ends of the push rod 17 respectively prop against the ejector rod 2 and the iron core 15, an annular shoulder 2a is arranged on the outer side of one end of the ejector rod 2 propping against the push rod 17, and two ends of the reset spring 12 respectively act on the annular shoulder 2a and the inner wall of the valve seat 10.

In this embodiment, as shown in fig. 2 and 3, the valve seat 10 has a connector 9a screwed with the valve body 1, the connector 9a has an inner hole communicating with the inner cavity of the valve seat 10, one end of the connector 9a away from the seal 5 is located in the inner cavity of the valve seat 10 and the other end of the return spring 12 is sleeved outside the end of the connector 9 a. The connector 9a is internally provided with an annular convex part protruding out of the wall of the inner hole, the ejector rod 2 penetrates through the annular convex part and is in guide fit with the annular convex part, a limiting gasket 19 is fixed in an orifice of one end of the inner hole far away from the sealing piece 5, and a plurality of sealing rings 20 are sleeved outside the ejector rod 2 between the limiting gasket 19 and the annular convex part.

As shown in fig. 4, the combination valve comprises a pressure reducing valve 22 and an emergency cut-off valve at the high pressure end of the bottled gas, wherein the emergency cut-off valve at the high pressure end of the bottled gas is connected to the inlet end of the pressure reducing valve 22, and the outlet end of the pressure reducing valve 22 is provided with a connecting part 22a in the shape of a pagoda. The bottled gas high-pressure end emergency cut-off valve is to transversely set up the gas passage 1c and set up action spring 4 in the gas passage 1c, be spheroidal sealing member 5 and annular sealing seat 3, action spring 4 is more close to the one end of gas passage 1c air inlet position and is spacing in gas passage 1c, action spring 4's the other end supports on sealing member 5, sealing member 5 supports and is supported on sealing seat 3 one end drill way department, and because sealing member 5 is located the below of ejector pin 2, will promote sealing member 5 and produce the displacement along the vertical direction of ejector pin 2 on sealing seat 3 when ejector pin 2 moves down like this. When normal air supply is needed, the driving mechanism drives the ejector rod 2 to move downwards (the ejector rod 2 is positioned by the driving mechanism after moving downwards in place), so that the sealing element 5 is displaced at the orifice of the sealing seat 3, the sealing element 5 is offset from the center line of the sealing seat 3, and at the moment, the orifice at the end of the sealing seat 3 is not blocked by the sealing element 5, so that air can pass through. When air leakage occurs in a room, the driving mechanism controls the ejector rod 2 to move upwards to be separated from the sealing piece 5, one end of the acting spring 4 is abutted against the sealing piece 5, and the inner side of the end hole of the sealing seat 3 is provided with a tapered guide surface 3a, so that the sealing piece 5 can move back into the end hole of the sealing seat 3 and be blocked under the cooperation of the acting spring 4 and the guide surface 3a, thereby realizing emergency cutting to prevent air from continuing to leak outwards from a rear air leakage position. Through such setting for the emergent shutoff of this bottled gas high pressure end emergent trip valve receives less by the influence of pressure, this means that this bottled gas high pressure end emergent trip valve can direct connection in the exit of liquefied gas steel bottle and with relief pressure valve 22 connection at the rear of this bottled gas high pressure end emergent trip valve, thereby no matter the outward leakage of gas from the rear side pipe way or the outward leakage of gas from relief pressure valve 22 department can all be effectively prevented when emergent shutoff, has solved effectively and can't prevent the problem of the outward leakage of gas from the relief pressure valve 22 department of gas leakage when emergent shutoff.

Under the state that the central hole of the sealing seat 3 is blocked, the elastic direction of the acting spring 4 is the same as the conveying direction of the fuel gas in the gas passing channel 1c, so that the sealing effect is better when the emergency cut-off is performed due to the fact that the pressure is larger, and the use reliability of the bottled fuel gas high-pressure end emergency cut-off valve directly connected to the outlet of the liquefied gas steel cylinder is improved. Considering that the air leakage in the room is not common, the action spring 4 is subjected to anti-fatigue treatment in practice, so that the action spring is ensured not to lose elasticity due to long-term pushing by the ejector rod 2.

Specifically, the bottled gas high-pressure end emergency cut-off valve is connected in an outlet of the liquefied gas steel cylinder through the connecting sleeve 7 in a threaded manner, the pressure reducing valve for adjusting gas pressure is connected to the gas outlet 1b of the valve body 1 to form a combined valve as shown in fig. 4, the indoor gas concentration detector is connected with the coil 14 in a signal manner, and when the liquefied gas steel cylinder is opened, gas firstly passes through the bottled gas high-pressure end emergency cut-off valve and then enters the pressure reducing valve for pressure reduction. Under the normal state, as shown in fig. 2, the emergency cut-off valve at the high-pressure end of the bottled gas is required to be kept in an open state, and the specific operation is that the iron core 15 is manually pressed down, so that the iron core 15 pushes the ejector rod 2 through the push rod 17 to overcome the action of the reset spring 12 and move, and the ejector rod 2 gradually pushes the sealing element 5 to displace along the axial direction of the ejector rod 2, so that the sealing element 5 deviates from the central line of the sealing seat 3; after the iron core 15 approaches the magnet 16, the iron core is held by the magnetic force of the magnet 16, so that the ejector rod 2 is always kept in a state of being pressed against the sealing element 5 to keep the central hole 3a of the sealing seat 3 open. When leakage occurs, the indoor gas concentration detector detects that the concentration of the indoor gas exceeds a set value, then the coil 14 is controlled to be electrified, the electromagnetic force generated by the electrified coil 14 and the magnetic force of the magnet 16 are counteracted, so that the iron core 15 is not adsorbed by the magnet 16 any more, the ejector rod 2 is reset and moved under the action of the elastic force of the reset spring 12, and the iron core 15 is pushed to a position far away from the magnet 16 by the ejector rod 17 in a reverse direction; after the pushing of the ejector rod 2 is lost, the sealing element 5 is matched with the taper of the guide surface 3a at the smaller end of the acting spring 4, so that the sealing element 5 moves back to the hole of the end of the sealing seat 3 and is blocked, emergency cutting is realized, and the state in the emergency cutting is shown in fig. 3. Because this bottled gas high pressure end emergency cut-off valve is connected in relief pressure valve 22 front end, consequently meet the condition that relief pressure valve 22 leaks gas, utilize the emergent shutoff of this bottled gas high pressure end emergency cut-off valve can prevent effectively that the gas from continuing to leak outward from relief pressure valve 22.

Example two

The present embodiment is basically the same in structure and principle as the first embodiment, except that: in this embodiment, the acting spring 4 is cylindrical, the outer diameter of the acting spring 4 is smaller than the inner diameter of the air passage 1c, and one end of the acting spring 4, which is closer to the air inlet position of the air passage 1c, is welded and fixedly connected in the air passage 1c.

The specific embodiments described herein are offered by way of example only to illustrate the spirit of the invention. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions thereof without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Claims (10)

1. The utility model provides an emergent trip valve of bottled gas high pressure end, includes valve body (1) and the vertical ejector pin (2) that set up in valve body (1) that are provided with air passage (1 c), valve body (1) lateral part still be connected with can drive ejector pin (2) reciprocate and with the actuating mechanism of its location after ejector pin (2) remove in place, its characterized in that, air passage (1 c) along transversely setting up and being provided with annular sealing seat (3) in it, still be provided with in air passage (1 c) along transversely arranging's action spring (4) and be spherical and be located sealing member (5) of ejector pin (2) below, the one end that is close to air passage (1 c) air inlet position in the both ends of action spring (4) is spacing in air passage (1 c) and its other end supports and lean on sealing member (5), the one end drill way of sealing seat (3) has the guide surface (3 a) and sealing member (5) of taking the tapering and supports and lean on this end hole department of sealing seat (3), sealing member (5) have the clearance along the axial between valve body (2) relative to the inner wall of valve body (1).

2. The bottled gas high-pressure end emergency shut-off valve according to claim 1, wherein a concave cavity (1 e) recessed towards the direction far away from the ejector rod (2) is arranged below the sealing piece (5) on the inner wall of the valve body (1), the concave cavity (1 e) forms the yielding gap, and a shoulder (1 f) is formed at the joint of the inner wall of the concave cavity (1 e) and the inner wall of the valve body (1).

3. The emergency cut-off valve for the high-pressure end of bottled gas according to claim 2, wherein the acting spring (4) is in a pagoda shape, one end with a larger size of the acting spring (4) is closer to the air inlet position of the air passing channel (1 c) than the other end with a smaller size, and the outer wall of the one end with the larger size of the acting spring (4) is clamped on the inner wall of the air passing channel (1 c).

4. The bottled gas high-pressure end emergency shut-off valve according to claim 2, wherein the acting spring (4) is cylindrical, the outer diameter of the acting spring (4) is smaller than the inner diameter of the gas passing channel (1 c), and one end of the acting spring (4) which is closer to the gas inlet position of the gas passing channel (1 c) is fixedly connected in the gas passing channel (1 c) in a welding way.

5. The emergency shut-off valve for the high pressure end of bottled gas according to claims 1-4, characterized in that said guide surface (3 a) is convex in an arc shape towards the centre line of the sealing seat (3).

6. The bottled gas high-pressure end emergency shut-off valve according to claim 1, characterized in that the valve body (1) is provided with an air inlet (1 a) and an air outlet (1 b) and an air passage (1 c) is arranged between the air inlet and the air outlet, the valve body (1) is connected with an air inlet joint (6), one end of the air inlet joint (6) is connected in the air inlet (1 a) in a threaded manner, one end of the acting spring (4) is abutted against the end of the air inlet joint (6), a connecting sleeve (7) with external threads is sleeved outside the air inlet joint (6), a hand wheel (8) is fixedly connected outside the connecting sleeve (7), and the other end of the air inlet joint (6) is sleeved with a sealing gasket (9).

7. The bottled gas high-pressure end emergency shut-off valve according to claim 1, characterized in that the valve body (1) on be connected with disk seat (10), ejector pin (2) wear to establish in disk seat (10), actuating mechanism includes electromagnetic control assembly (11) and is kept away from reset spring (12) on ejector pin (2) of sealing member (5) direction, electromagnetic control assembly (11) include mount pad (13) of threaded connection on disk seat (10), coil (14) in being fixed in mount pad (13) and iron core (15) and magnet (16) that all are located the inboard of coil (14), iron core (15) slide along vertical direction and set up and iron core (15) and ejector pin (2) are supported and lean on, can be absorbed by magnet (16) when iron core (15) are moved towards the direction that is close to sealing member (5), can eliminate the magnetism of magnet (16) when coil (14) is circular telegram.

8. The emergency cut-off valve for bottled gas high-pressure end according to claim 7, wherein the magnet (16) is annular and is located at one side of the iron core (15) closer to the ejector rod (2), the installation seat (13) is internally provided with a push rod (17) which is not magnetic and penetrates through the magnet (16), and two ends of the push rod (17) are respectively abutted against the ejector rod (2) and the iron core (15).

9. The emergency cut-off valve for the high pressure end of the bottled gas according to claim 7, wherein an annular shoulder (2 a) is arranged on the outer side of one end of the ejector rod (2) which is abutted against the ejector rod (17), and two ends of the return spring (12) respectively act on the annular shoulder (2 a) and the inner wall of the valve seat (10).

10. The combined valve comprises a pressure reducing valve (22), and is characterized by further comprising the bottled gas high-pressure end emergency shut-off valve according to any one of claims 1-9, wherein the bottled gas high-pressure end emergency shut-off valve is connected to the inlet end of the pressure reducing valve (22), and the outlet end of the pressure reducing valve (22) is provided with a connecting part (22 a) in a pagoda shape.

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