Emergency shut-off valve and combination valve at the high-pressure end of bottled gas

Abstract

The present invention provides an emergency shut-off valve and a combination valve for the high-pressure end of bottled gas, belonging to the field of valve technology. It solves the problem that it is impossible to prevent gas from leaking outward from a leaking pressure reducing valve during emergency shut-off. The emergency shut-off valve for the high-pressure end of bottled gas includes a valve body with an air passage arranged horizontally and a push rod arranged vertically in the valve body. An annular sealing seat is arranged in the air passage. An action spring and a spherical sealing member located below the push rod are also arranged in the air passage. Of the two ends of the action spring, the end closer to the air inlet position of the air passage is limited in the air passage and the other end abuts on the sealing member. A tapered guide surface is provided in the orifice at one end of the sealing seat and the sealing member abuts against the orifice at this end of the sealing seat. The seal has a clearance along the axial direction of the push rod relative to the inner wall of the valve body. It has the advantages of being able to effectively solve the problem that it is impossible to prevent gas from leaking outward from a leaking pressure reducing valve during emergency shut-off.

Description

Technical Field

[0001] The invention belongs to the technical field of valves and relates to an emergency shut-off valve and a combination valve at the high-pressure end of bottled gas. Background Art

[0002] Existing gas pipelines are equipped with gas valves to control the flow of gas. For safety reasons, gas concentration detectors are also installed indoors. When a gas leak occurs, the gas concentration detector detects that the indoor gas concentration exceeds the set value and sounds an alarm, notifying people to close the gas valve. However, in practice, rooms are often unoccupied or people are busy with other things and fail to receive the alarm signal in time, resulting in a failure to close the gas valve in time, which can lead to gas explosions or gas poisoning.

[0003] In order to solve the above problems, China Patent discloses a household electromagnetic gas emergency shut-off valve with patent application number 201620700707.8, which includes a valve body, a valve stem, a sealing block, a reset spring and a magnetic control device; the valve stem 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 is located at the control port in the valve body, which is used to seal the control port of the on-off valve body, the sealing block is fixedly installed on one end of the valve stem located in the valve body, and the movement of the valve stem can drive the sealing block to move up and down, and a button handle is installed on the end of the valve stem located outside the valve body; the reset spring is sleeved on the valve stem, and the upper end of the reset spring is fixed on the valve body, and the lower end is fixed on the sealing block; the magnetic control device is arranged in the valve The magnetic control device comprises an electromagnet, a permanent magnet, an iron core and a drive circuit. The iron core is fixedly mounted on the valve stem. The permanent magnet is fixed in the valve body and is located at the upper end of the opening where the valve stem is mounted in the valve body. The electromagnet is mounted in the valve body and is sleeved with the permanent magnet. The drive circuit is connected to the electromagnet to control the on and off of the electromagnet. The drive circuit comprises a power supply, a capacitor, a protective resistor and a detection switch. The positive terminal of the capacitor is connected to the positive terminal of the power supply, the negative terminal of the capacitor is connected to the negative terminal of the power supply, the protective resistor is connected in series between the positive terminal of the capacitor and the positive terminal of the power supply, the electromagnet is connected in parallel with the capacitor, and the detection switch is connected in series between the electromagnet and the capacitor. When the electromagnet is energized, the magnetic pole of the electromagnet is opposite to the magnetic pole of the permanent magnet. When opening the valve, the button handle is pulled upward by manual operation, so that the button handle drives the valve stem upward, so that the sealing block is separated from the control port in the valve body, and the valve is opened. Then the iron core on the valve stem moves upward to contact the permanent magnet, and the magnetic force of the permanent magnet causes the iron core to be adsorbed on the permanent magnet, thus avoiding the elastic force of the reset spring causing the valve stem to move downward. When gas leaks, the detection switch is closed after receiving the detection signal of the gas detector, so that the power supply quickly charges the electricity stored in the capacitor into the coil of the electromagnet, so that the electromagnet quickly generates electromagnetic force and is used to offset the magnetic force of the permanent magnet, so that the permanent magnet's attraction to the iron core disappears, so that the elastic force of the reset spring moves the sealing block downward to seal the control port of the valve body, and the valve is closed. The above-mentioned household electromagnetic gas emergency shut-off valve can automatically cut off the gas passage when a gas leak occurs indoors, preventing the gas from continuing to leak.

[0004] However, the above-mentioned household electromagnetic gas emergency shut-off valve also has disadvantages: the direction in which the return spring acts on the sealing block is opposite to the direction in which the gas passes through the control port (according to the accompanying drawings in the specification, the elastic force of the return spring is applied downward on the sealing block, while the direction in which the gas passes through the control port is upward). In other words, the gas will form resistance to the sealing block closing the control port, which results in the household electromagnetic gas emergency shut-off valve being used only when connected to the rear end of a pressure reducing valve (the pressure reducing valve is directly connected to the outlet of the liquefied gas cylinder, and the outlet pressure of the liquefied gas cylinder is very high. Using a pressure reducing valve can reduce the pressure to ensure safety). In practice, the pressure reducing valve may also leak due to failure of the sealing part. However, since the electromagnetic gas emergency shut-off valve is connected to the rear end of the pressure reducing valve, it can only cut off the gas passage at the rear end of the pressure reducing valve, but cannot prevent gas from leaking outward from the pressure reducing valve. Summary of the Invention

[0005] The purpose of the present invention is to address the above-mentioned problems existing in the prior art and to propose an emergency shut-off valve and a combination valve at the high-pressure end of bottled gas, which solves the problem that the gas cannot be prevented from leaking out from the leaking pressure reducing valve during emergency shut-off.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] The emergency shut-off valve at the high-pressure end of bottled gas comprises a valve body provided with an air passage and a push rod vertically arranged in the valve body. The side of the valve body is also connected to a driving mechanism that can drive the push rod to move up and down and position the push rod after it moves into place. It is characterized in that the air passage is arranged horizontally and an annular sealing seat is provided therein. The air passage is also provided with an action spring arranged horizontally and a spherical sealing member located below the push rod. Of the two ends of the action spring, the end closer to the air inlet position of the air passage is limited in the air passage and the other end rests on the sealing member. A tapered guide surface is provided in the orifice at one end of the sealing seat and the seal rests at the orifice at this end of the sealing seat. The seal has a clearance along the axial direction of the push rod relative to the inner wall of the valve body.

[0008] The emergency shut-off valve at the high-pressure end of the bottled gas sets the gas passage horizontally and sets an action spring, a spherical seal and an annular sealing seat in the gas passage. The end of the action spring closer to the gas inlet position of the gas passage is limited in the gas passage, and the other end of the action spring abuts on the seal, which abuts on an orifice at one end of the sealing seat. Moreover, since the seal is located below the push rod, when the push rod moves downward, the seal will be pushed to move on the sealing seat along the vertical direction of the push rod. When normal gas supply is required, the drive mechanism drives the push rod downward (the drive mechanism will position the push rod after it moves down to its position) to cause the seal to move at the orifice of the sealing seat, causing the seal to deviate from the center line of the sealing seat. At this time, the orifice at this end of the sealing seat is not blocked by the seal, allowing gas to pass through. When a gas leak occurs indoors, the driving mechanism controls the push rod to move upward and separate from the seal. Since one end of the action spring abuts against the seal and the inner side of the end opening of the sealing seat has a tapered guide surface, the seal will return to the end opening of the sealing seat under the cooperation of the action spring and the guide surface and seal it, thereby achieving emergency shutoff to prevent gas from continuing to leak outward from the rear leak position. Through such a setting, the emergency shutoff of the bottled gas high-pressure end emergency shutoff valve is less affected by pressure, which means that the bottled gas high-pressure end emergency shutoff valve can be directly connected to the outlet of the liquefied gas cylinder and the pressure reducing valve can be connected to the rear of the bottled gas high-pressure end emergency shutoff valve. Therefore, during emergency shutoff, whether gas leaks outward from the rear pipeline or gas leaks outward from the pressure reducing valve can be effectively prevented, effectively solving the problem of being unable to prevent gas from leaking outward from the leaking pressure reducing valve during emergency shutoff.

[0009] When the center hole of the sealing seat is blocked, the direction of the spring's force aligns with the direction of gas flow within the gas passage. Therefore, higher gas pressure results in a more effective emergency shutoff seal, enhancing the reliability of this high-pressure emergency shutoff valve when connected directly to the outlet of a liquefied gas cylinder. Furthermore, because the spring is located within the gas passage and independent of the drive mechanism, damage to the drive mechanism during the emergency shutoff does not prevent the valve from failing.

[0010] In the above-mentioned emergency shut-off valve for the high-pressure end of bottled gas, the inner wall of the valve body has a concave cavity below the seal, which is recessed away from the push rod. The concave cavity forms the above-mentioned clearance, and a shoulder is formed at the connection between the inner wall of the cavity and the inner wall of the valve body.

[0011] The shoulder formed by the connection between the inner wall of the cavity and the inner wall of the valve body abuts against the seal to limit its maximum displacement, preventing excessive seal displacement from preventing the spring from resetting the seal and achieving emergency shutoff. In practice, by controlling the travel distance of the ejector pin and adjusting the position of the shoulder, the displacement of the seal caused by the ejector pin is kept within the seal's radius.

[0012] In the above-mentioned emergency shut-off valve at the high-pressure end of bottled gas, the action spring is pagoda-shaped, and the larger end of the action spring is closer to the air inlet position of the air passage than the smaller end, and the outer wall of the larger end of the action spring is stuck on the inner wall of the air passage.

[0013] By setting the action spring in a pagoda shape and the outer wall of the larger end of the action spring is stuck on the inner wall of the air passage, the larger end of the action spring will not be displaced laterally or tilted in the vertical direction. Therefore, when the push rod pushes the seal to displace, the seal can drive the smaller end of the action spring to deform to form a reset force.

[0014] In the above-mentioned emergency shut-off valve at the high-pressure end of bottled gas, as another technical solution, the action spring is cylindrical, the outer diameter of the action spring is smaller than the inner diameter of the gas passage, and the end of the action spring closer to the air inlet position of the gas passage is welded and fixed in the gas passage.

[0015] In the above-mentioned emergency shut-off valve for the high-pressure end of bottled gas, the guide surface is convex in an arc shape toward the center line of the sealing seat.

[0016] In the above-mentioned emergency shut-off valve for the high-pressure end of bottled gas, the valve body has an air inlet and an air outlet with an air passage located therebetween. An air inlet joint is connected to the valve body, one end of which is threadedly connected to the air inlet, and one end of the action spring rests against the end of the air inlet joint. The outer sleeve of the air inlet joint is provided with a connecting sleeve with an external thread, a hand wheel is fixedly connected to the outside of the connecting sleeve, and the other end of the air inlet joint is provided with a sealing gasket.

[0017] Through the arrangement of the air inlet joint, the connecting sleeve and the hand wheel, the emergency shut-off valve at the high-pressure end of the bottled gas can be directly connected to the outlet of the liquefied gas cylinder like the existing pressure reducing valve for bottled gas, and the pressure reducing valve is connected to the air outlet of the valve body. In this way, no matter whether there is a leak in the pipeline at the rear end of the pressure reducing valve or the pressure reducing valve itself, the emergency shut-off valve at the high-pressure end of the bottled gas can be used to prevent the gas from continuing to leak through emergency shut-off.

[0018] In the above-mentioned emergency shut-off valve for the high-pressure end of bottled gas, a valve seat is connected to the valve body, a push rod is passed through the valve seat, and a driving mechanism includes an electromagnetic control component and a return spring acting on the push rod in a direction away from the seal. The electromagnetic control component includes a mounting seat threadedly connected to the valve seat, a coil fixed in the mounting seat, and an iron core and a magnet both located on the inner side of the coil. The iron core is arranged to slide in the vertical direction and the iron core is in abutment against the push rod. When the iron core moves in a direction close to the seal, it can be attracted by the magnet.

[0019] When the emergency shut-off valve at the high-pressure end of bottled gas is closed, the ejector pin is separated from the seal, and the iron core is outside the magnetic field of the magnet. To open the valve, the iron core is manually pressed down, causing it to push the ejector pin, overcoming the return spring and gradually pushing the seal to roll away from the center hole of the sealing seat. The iron core is then attracted by the magnet's force and held stationary, causing the ejector pin to move into position and remain fixed. This way, the ejector pin always remains against the seal, opening the center hole of the sealing seat and ensuring a normal gas supply. When a leak occurs, the indoor gas concentration detector detects that the concentration of indoor gas exceeds the set value and controls the coil to be energized. The electromagnetic force generated after the coil is energized will counteract the magnetic force of the magnet, so that the iron core is no longer attracted by the magnet. In this way, the push rod will reset and move under the elastic force of the reset spring, and push the iron core in the opposite direction to a position away from the attraction of the magnet; after losing the top pressure of the push rod, the action spring will reset under the action of its own elastic force and drive the seal to seal the center hole of the sealing seat to achieve emergency shut-off; in the emergency shut-off state, since the iron core is away from the attraction range of the magnet, the push rod is positioned in a position separated from the seal under the elastic force of the reset spring.

[0020] In the above-mentioned bottled gas high-pressure end emergency shut-off valve, the magnet is annular and located on the side of the iron core closer to the push rod. A non-magnetic push rod passing through the magnet is also provided in the mounting seat, and the two ends of the push rod are respectively against the push rod and the iron core.

[0021] The magnet is located on the side of the core closer to the ejector pin. As the core moves toward the seal, it is attracted by the magnet's force, allowing the ejector pin to overcome the return spring and maintain its position against the seal. The push rod is used to transmit the force, and because it is non-magnetic, it will not be attracted by the magnet and prevent the ejector pin from moving.

[0022] In the above-mentioned bottled gas high-pressure end emergency shut-off valve, the outer side of the end where the push rod abuts against the push rod has an annular shoulder, and the two ends of the return spring act on the annular shoulder and the inner wall of the valve seat respectively.

[0023] The combination valve includes a pressure reducing valve, which is characterized in that it also includes the emergency shut-off valve at the high-pressure end of the bottled gas as described above, the emergency shut-off valve at the high-pressure end of the bottled gas is connected to the inlet end of the pressure reducing valve, and the outlet end of the pressure reducing valve has a pagoda-shaped connection part.

[0024] The emergency shut-off valve at the high-pressure end of the bottled gas is connected to the inlet end of the pressure reducing valve. When in use, the gas emergency valve is directly installed and fixed at the outlet of the liquefied gas cylinder, and then the hose is connected to the outlet end of the pressure reducing valve. The (high-pressure) gas in the liquefied gas cylinder directly enters the emergency shut-off valve at the high-pressure end of the bottled gas first, and then enters the pressure reducing valve to reduce the pressure so that it stabilizes at a lower pressure for supply. The pressure reducing valve is located at the rear end of the emergency shut-off valve at the high-pressure end of the bottled gas. In this way, no matter whether there is a leak in the pipeline at the rear end of the pressure reducing valve or in the pressure reducing valve itself, the emergency shut-off valve at the high-pressure end of the bottled gas can be used to prevent the gas from continuing to leak through emergency shut-off.

[0025] Compared with the prior art, the emergency shut-off valve at the high-pressure end of bottled gas sets the gas passage horizontally and sets an action spring, a spherical seal and an annular sealing seat in the gas passage. Under normal gas supply conditions, the push rod pushes on the seal to cause it to produce vertical displacement to open the center hole of the sealing seat. When gas leakage occurs indoors, the driving mechanism controls the movement of the push rod and separates it from the seal so that the seal moves back under the cooperation of the action spring and the guide surface to seal the center hole of the sealing seat to achieve emergency shut-off. As a result, the emergency shut-off function of the emergency shut-off valve at the high-pressure end of bottled gas is not affected by the pressure of the gas and can be directly connected between the outlet of the liquefied gas cylinder and the pressure reducing valve. Therefore, during emergency shut-off, both the gas leakage from the rear pipeline and the gas leakage from the pressure reducing valve can be effectively prevented, effectively solving the problem that the gas leakage from the leaking pressure reducing valve cannot be prevented during emergency shut-off. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural diagram of the emergency shut-off valve at the high-pressure end of the bottled gas.

[0027] Figure 2 This is a cross-sectional view of the emergency shut-off valve at the high-pressure end of the bottled gas when it is in the open state.

[0028] Figure 3 It is a cross-sectional view of the emergency shut-off valve at the high-pressure end of the bottled gas when it is in the emergency shut-off state.

[0029] Figure 4 It is a schematic diagram of the combination valve.

[0030] In the figure, 1 is the valve body; 1a is the air inlet; 1b is the air outlet; 1c is the air passage; 1d is the annular partition; 1e is the concave cavity; 1f is the shoulder; 2 is the push rod; 2a is the annular boss; 3 is the sealing seat; 3a is the guide surface; 4 is the action spring; 5 is the sealing member; 6 is the air inlet joint; 7 is the connecting sleeve; 8 is the hand wheel; 9 is the sealing gasket; 10 is the valve seat; 10a is the connecting head; 11 is the electromagnetic control component; 12 is the return spring; 13 is the mounting seat; 14 is the coil; 15 is the iron core; 15a is the operating part; 16 is the magnet; 17 is the push rod; 18 is the annular sealing gasket; 19 is the limit gasket; 20 is the sealing ring; 21 is the flat gasket; 22 is the pressure reducing valve; 22a is the connecting part. DETAILED DESCRIPTION

[0031] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments.

[0032] Example 1

[0033] like Figure 1 、 Figure 2 and Figure 3As shown, the emergency shut-off valve for the high-pressure end of bottled gas includes a valve body 1 having an air inlet 1a and an air outlet 1b. The valve body 1 is further provided with an air passage 1c connecting the air inlet 1a and the air outlet 1b. In this embodiment, the air passage 1c is arranged in a transverse direction, and the air inlet 1a, the air outlet 1b and the air passage 1c are arranged on the same center line. The valve body 1 has an annular partition 1d between the air outlet 1b and the air passage 1c. The air outlet 1b is provided with an annular sealing gasket 18, which abuts against the annular partition 1d. An air inlet connector 6 is connected to the valve body 1, one end of which is threadedly connected to the air inlet 1a. The air inlet connector 6 is provided with a connecting sleeve 7 with external threads on the outer surface, and a handwheel 8 is fixed to the outer surface of the connecting sleeve 7. The other end of the air inlet connector 6 is provided with a sealing gasket 9. A push rod 2 is vertically mounted within the valve body 1. A drive mechanism is connected to the side of the valve body 1, driving the push rod 2 up and down and positioning it in place. An annular sealing seat 3 is located within the air passage 1c. In this embodiment, the sealing seat 3 is a rubber member that abuts against the annular partition 1d. Also located within the air passage 1c are a laterally arranged spring 4 and a spherical seal 5 positioned below the push rod 2. The spring 4, with its end closer to the air inlet of the air passage 1c, is retained within the passage 1c. The other end of the spring 4 abuts against the seal 5, which has an outer diameter larger than the inner diameter of the end of the spring 4 it is fitted with. One end of the seal seat 3 has a tapered guide surface 3a, which protrudes in an arc shape toward the centerline of the seal seat 3. The seal 5 abuts against this end of the seal seat 3, providing clearance along the axial direction of the push rod 2 relative to the inner wall of the valve body 1. Specifically, the action spring 4 is in the shape of a pagoda, with the larger end of the action spring 4 being closer to the air inlet position of the air passage 1c than the smaller end. The air passage 1c is in the shape of a circular hole. The larger end of the action spring 4 is in abutment with the end of the air inlet connector 6 that is threadedly connected to the air inlet 1a, and the outer wall of the larger end of the action spring 4 is stuck on the inner wall of the air passage 1c. The smaller end of the action spring 4 is sleeved on the outside of the seal 5, and the outer diameter of the seal 5 is larger than the inner diameter of the smaller end of the action spring 4. The action spring 4 is in the shape of a pagoda, and when its larger end is stuck in the air passage 1c, when the push rod 2 pushes the seal 5 to generate displacement, the smaller end of the action spring 4 can be deformed. In practice, the seal 5 and the action spring 4 are not fixedly connected, that is, they are simply in abutment with each other, so that the seal 5 can roll under the push of the push rod 2.

[0034] Further, if Figure 2 and Figure 3As shown, the end of push rod 2 near seal 5 is flat. The inner wall of valve body 1, below seal 5, has a recessed cavity 1e that extends away from push rod 2. This cavity 1e forms the aforementioned clearance, and a shoulder 1f forms where the inner wall of cavity 1e meets the inner wall of valve body 1. In practice, by controlling the travel distance of push rod 2 and positioning the shoulder 1f, the displacement of seal 5 caused by push rod 2 is kept within a radius smaller than that of seal 5.

[0035] Further, if Figure 1 、 Figure 2 and Figure 3 As shown, the valve body 1 is connected to a valve seat 10, and the push rod 2 is disposed within the valve seat 10. The drive mechanism includes an electromagnetic control assembly 11 and a return spring 12 that acts on the push rod 2 in a direction away from the seal 5. The electromagnetic control assembly 11 includes a mounting seat 13 threadedly connected to the valve seat 10, a coil 14 fixed within the mounting seat 13, and an iron core 15 and a magnet 16 both located inside the coil 14. The iron core 15 is arranged to slide in the vertical direction, with one end of the iron core 15 abutting against the push rod 2. The other end of the iron core 15 extends outside the mounting seat 13 and has an operating portion 14a. The magnet 16 is a strong magnet. When the iron core 15 moves toward the seal 5, it is attracted by the magnet 16. When the coil 14 is energized, the electromagnetic force generated will abut the magnetic force of the magnet 16. The magnet 16 is annular and is located on the side of the iron core 15 closer to the push rod 2. A flat gasket 21 is also provided in the mounting seat 13, which abuts against the side of the magnet 16 closer to the iron core 15. A push rod 17 is also provided in the mounting seat 13. The push rod 17 is non-magnetic and passes through the magnet 16. The two ends of the push rod 17 abut against the push rod 2 and the iron core 15 respectively. The outer side of the end of the push rod 2 abutting against the push rod 17 has an annular shoulder 2a. The two ends of the return spring 12 act on the annular shoulder 2a and the inner wall of the valve seat 10 respectively.

[0036] In this embodiment, if Figure 2 and Figure 3 As shown, the valve seat 10 has a connector 9a threadedly connected to the valve body 1. The connector 9a has an inner hole that communicates with the inner cavity of the valve seat 10. The 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 this end of the connector 9a. The connector 9a has an annular protrusion protruding from the inner hole wall. The push rod 2 passes through the annular protrusion and the two are guided together. A limit washer 19 is fixed in the opening of the inner hole away from the seal 5. Several sealing rings 20 are installed on the outer surface of the push rod 2 between the limit washer 19 and the annular protrusion.

[0037] like Figure 4As shown, the combined valve includes a pressure reducing valve 22 and the bottled gas high-pressure emergency shut-off valve. The bottled gas high-pressure 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 has a pagoda-shaped connecting portion 22a. The bottled gas high-pressure emergency shut-off valve arranges the gas passage 1c in a horizontal direction and arranges an action spring 4, a spherical sealing member 5 and an annular sealing seat 3 in the gas passage 1c. The action spring 4 is positioned in the gas passage 1c at one end closer to the gas inlet position, and the other end of the action spring 4 abuts against the sealing member 5. The sealing member 5 abuts against an orifice at one end of the sealing seat 3. Moreover, since the sealing member 5 is located below the push rod 2, when the push rod 2 moves downward, the sealing member 5 is pushed to move on the sealing seat 3 in the vertical direction of the push rod 2. When normal air supply is required, the driving mechanism drives the push rod 2 downward (the driving mechanism holds the push rod 2 in place after it moves downward), causing the seal 5 to shift at the opening of the sealing seat 3, causing the seal 5 to deviate from the center line of the sealing seat 3. At this time, the opening at this end of the sealing seat 3 is not blocked by the seal 5, allowing air to pass through. When air leakage occurs indoors, the driving mechanism controls the push rod 2 to move upward and separate from the seal 5. Since one end of the action spring 4 is against the seal 5 and the inner side of the opening at this end of the sealing seat 3 has a tapered guide surface 3a, the seal 5 will return to its original position and move into the opening at this end of the sealing seat 3 under the cooperation of the action spring 4 and the guide surface 3a and block it, thereby achieving emergency shut-off to prevent the air from continuing to leak outward from the rear leakage position. Through such a setting, the emergency shut-off of the emergency shut-off valve at the high-pressure end of the bottled gas is less affected by pressure, which means that the emergency shut-off valve at the high-pressure end of the bottled gas can be directly connected to the outlet of the liquefied gas cylinder and the pressure reducing valve 22 can be connected to the rear of the emergency shut-off valve at the high-pressure end of the bottled gas. Therefore, during emergency shut-off, both the leakage of gas from the rear pipeline and the leakage of gas from the pressure reducing valve 22 can be effectively prevented, effectively solving the problem of being unable to prevent the gas from leaking from the leaking pressure reducing valve 22 during emergency shut-off.

[0038] When the center hole of the sealing seat 3 is blocked, the direction of the spring force of the action spring 4 is the same as the direction of gas transport within the gas passage 1c. Therefore, the greater the gas pressure, the better the sealing effect during emergency shut-off, thereby improving the reliability of the bottled gas high-pressure end emergency shut-off valve when directly connected to the outlet of a liquefied gas cylinder. Considering that indoor gas leaks are uncommon, the action spring 4 is treated with anti-fatigue treatment in practice to ensure that it does not lose its elastic force due to long-term pressure from the push rod 2.

[0039] Specifically, the emergency shut-off valve at the high-pressure end of the bottled gas is threadedly connected to the outlet of the liquefied gas cylinder through the connecting sleeve 7, and the pressure reducing valve for adjusting the gas pressure is connected to the gas outlet 1b of the valve body 1 to form a Figure 4The combination valve shown in the figure establishes a signal connection between the indoor gas concentration detector and the coil 14. When the liquefied gas cylinder is opened, the gas first passes through the emergency shut-off valve at the high-pressure end of the bottled gas and then enters the pressure reducing valve for pressure reduction. Figure 2 As shown, the emergency shut-off valve at the high-pressure end of the bottled gas must be kept open. The specific operation is to manually press the iron core 15 so that the iron core 15 pushes the push rod 2 through the push rod 17 to overcome the action of the return spring 12 and move, and the push rod 2 gradually pushes the seal 5 to be displaced along the axial direction of the push rod 2, so that the seal 5 deviates from the center line of the sealing seat 3; after the iron core 15 approaches the magnet 16, it is attracted by the magnetic force of the magnet 16 and remains motionless, so that the push rod 2 will always remain in a state of supporting the seal 5 to keep the center hole 3a of the sealing seat 3 open. When a leak occurs, the indoor gas concentration detector detects that the indoor gas concentration exceeds the set value and controls the coil 14 to be energized. The electromagnetic force generated by the coil 14 after being energized offsets the magnetic force of the magnet 16, so that the iron core 15 is no longer attracted by the magnet 16. In this way, the push rod 2 will be reset and moved under the elastic force of the reset spring 12, and the iron core 15 is pushed in the opposite direction by the push rod 17 to a position away from the magnet 16; after the seal 5 loses the top pressure of the push rod 2, the smaller end of the action spring 4 and the taper of the guide surface 3a cooperate to make the seal 5 return to its original position and move to the end opening of the sealing seat 3 and seal it, thereby realizing emergency shut-off. The state during emergency shut-off is as follows: Figure 3 As shown. Since the bottled gas high-pressure end emergency shut-off valve is connected to the front end of the pressure reducing valve 22, if the pressure reducing valve 22 leaks, the emergency shut-off function of the bottled gas high-pressure end emergency shut-off valve can effectively prevent the gas from continuing to leak outward from the pressure reducing valve 22.

[0040] Example 2

[0041] The structure and principle of this embodiment are basically the same as those of the first embodiment, except that: in this embodiment, the action spring 4 is cylindrical, the outer diameter of the action spring 4 is smaller than the inner diameter of the air passage 1c, and the end of the action spring 4 closer to the air inlet position of the air passage 1c is welded and fixedly connected to the air passage 1c.

[0042] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope of the appended claims.

Claims

1. A bottled gas high-pressure end emergency shut-off valve, comprising a valve body (1) provided with an air passage (1c) and a push rod (2) vertically arranged in the valve body (1), wherein the side of the valve body (1) is further connected to a driving mechanism capable of driving the push rod (2) to move up and down and positioning the push rod (2) after it moves into position, characterized in that: The air passage (1c) is arranged in the transverse direction and has an annular sealing seat (3) therein. The air passage (1c) is also provided with an action spring (4) arranged in the transverse direction and a spherical sealing member (5) located below the push rod (2). Of the two ends of the action spring (4), the end closer to the air inlet position of the air passage (1c) is limited in the air passage (1c) and the other end abuts against the sealing member (5). A tapered guide surface ( 3a) and the sealing member (5) abuts against the end opening of the sealing seat (3), and the sealing member (5) has a clearance gap along the axial direction of the push rod (2) relative to the inner wall of the valve body (1), and the inner wall of the valve body (1) has a concave cavity (1e) below the sealing member (5) and is concave in a direction away from the push rod (2), and the concave cavity (1e) forms the clearance gap, and the inner wall of the concave cavity (1e) and the inner wall of the valve body (1) form a shoulder (1f) at the connection, and the valve body (1) is connected to the valve seat (10) The push rod (2) is inserted into the valve seat (10), and the driving mechanism includes an electromagnetic control component (11) and a return spring (12) acting on the push rod (2) in a direction away from the sealing member (5). The electromagnetic control component (11) includes a mounting seat (13) threadedly connected to the valve seat (10), a coil (14) fixed in the mounting seat (13), and an iron core (15) and a magnet (16) both located inside the coil (14). The iron core (15) is arranged to slide in the vertical direction. The iron core (15) is in contact with the push rod (2). When the iron core (15) moves toward the sealing member (5), it can be attracted by the magnet (16). When the coil (14) is energized, the magnetism of the magnet (16) can be eliminated. The magnet (16) is annular and located on the side of the iron core (15) closer to the push rod (2). A push rod (17) that is non-magnetic and passes through the magnet (16) is also provided in the mounting seat (13). The two ends of the push rod (17) are respectively in contact with the push rod (2) and the iron core (15).

2. The bottled gas high-pressure end emergency shut-off valve according to claim 1, characterized in that: The action spring (4) is in a pagoda shape, and the larger end of the action spring (4) is closer to the air inlet position of the air passage (1c) than the smaller end, and the outer wall of the larger end of the action spring (4) is stuck on the inner wall of the air passage (1c).

3. The bottled gas high pressure end emergency shut-off valve according to claim 1, characterized in that: The action spring (4) is cylindrical, the outer diameter of the action spring (4) is smaller than the inner diameter of the air passage (1c), and one end of the action spring (4) closer to the air inlet position of the air passage (1c) is welded and fixedly connected to the air passage (1c).

4. The bottled gas high-pressure end emergency shut-off valve according to any one of claims 1 to 3, characterized in that: The guide surface (3a) is raised in an arc shape toward the center line of the sealing seat (3).

5. The bottled gas high-pressure end emergency shut-off valve according to claim 1, characterized in that: The valve body (1) has an air inlet (1a) and an air outlet (1b) with an air passage (1c) located therebetween. An air inlet connector (6) is connected to the valve body (1). One end of the air inlet connector (6) is threadedly connected to the air inlet (1a). One end of the action spring (4) abuts against the end of the air inlet connector (6). The air inlet connector (6) is provided with a connecting sleeve (7) with an external thread on its outer sleeve. A hand wheel (8) is fixedly connected to the outside of the connecting sleeve (7). The other end of the air inlet connector (6) is provided with a sealing gasket (9).

6. The bottled gas high pressure end emergency shut-off valve according to claim 1, characterized in that: The outer side of one end of the push rod (2) against the push rod (17) has an annular shoulder (2a), and the two ends of the return spring (12) act on the annular shoulder (2a) and the inner wall of the valve seat (10) respectively.

7. A combination valve, including a pressure reducing valve (22), characterized in that It also includes a bottled gas high-pressure end emergency shut-off valve as described in any one of claims 1 to 6, 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) has a pagoda-shaped connection portion (22a).

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