Pressure maintaining gas cylinder valve

Abstract

A pressure maintaining device comprises an installation base, a spring and a valve, a transverse cavity is formed in the end, close to an air outlet, of the installation base, the valve is connected with the transverse cavity in a sliding and sealing mode, the two ends of the spring abut against the valve and the transverse cavity respectively, a first balance hole communicated with the transverse cavity is formed in the side wall of the installation base, and a second balance hole communicated with the transverse cavity is formed in the side wall of the installation base. A second balance hole communicated with the first balance hole is formed in the side wall of the valve body, sealing is formed between the two sides, located at the communication position of the first balance hole and the second balance hole, of the installation base and the inner wall of the gas channel, and a vent hole penetrating through the installation base is formed in the position, located on the outer side of the transverse cavity, of the installation base. The transverse cavity is only communicated with the atmosphere outside the valve body through the first balance hole and the second balance hole, high-pressure gas in the gas channel pushes the valve to the bottom of the transverse cavity, the opening degree of the valve is large, and the opening degree of the valve is only related to the pressure in a bottle and is not affected by the use flow and pressure at the gas outlet.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a pressure-maintaining gas cylinder valve. Background Art

[0002] A gas cylinder valve is a valve installed on a gas cylinder to control the on / off and flow of gas. When an ordinary gas cylinder valve is in use, when the gas is used up, it is easy to mix with the outside air. When filling the gas with high-purity gas next time, the gas cylinder must be evacuated before filling the gas cylinder with high-purity gas, which increases the production cost. Therefore, the existing technology has made improvements to the gas cylinder valve, and many of them have added a pressure-maintaining function. When the pressure in the gas cylinder is lower than the set pressure during the deflation process, the gas cylinder valve can automatically close to prevent the gas in the gas cylinder from being completely used up, thereby ensuring the purity of the gas in the gas cylinder.

[0003] In the existing gas cylinder valve with pressure-maintaining function (for example, the pressure-maintaining gas cylinder valve disclosed in the utility model patent with application number 202221261985.X), the valve center of the pressure-maintaining device is provided with a balancing hole, which is connected to the gas outlet. When the pressure reducer is used and the gas consumption is small, the pressure difference at both ends of the large piston of the valve is small, and the force of the valve spring is small. The ideal state is that the valve is always slightly open, and the gas flows out through the small gap between the valve and the sealing surface of the valve body for use. However, the actual situation is that as long as the valve is slightly opened, the gas will flow out. The bottle valve outlet and the high-pressure chamber of the pressure reducer are instantly filled with high-pressure gas. At the same time, the tail of the valve is also filled with high-pressure gas of the same pressure. Due to the small flow rate, the pressures at both ends of the valve's large piston are consistent, and the valve will be closed. The valve will not open again until the air pressure at the bottle valve outlet drops to a certain pressure difference with the pressure in the gas cylinder after the use of the pressure reducer. This situation will cause the valve to be opened and closed frequently, and the pressure at the outlet will be in a fluctuating state, affecting normal use. At the same time, the spring will be in a vibrating state, shortening the service life of the spring. Utility Model Content

[0004] The utility model aims to solve the problems existing in the prior art and provide a pressure-maintaining gas cylinder valve.

[0005] In order to achieve the above purpose, the utility model is implemented through the following technical solutions:

[0006] A pressure-maintaining gas cylinder valve comprises a valve body, a valve core and a valve core control mechanism, wherein the valve body is provided with an air inlet, an air outlet, a valve cavity and a gas channel connecting the air inlet and the air outlet, the valve core is arranged in the valve cavity and driven by the valve core control mechanism to open and close the air inlet; a pressure-maintaining device is arranged in the gas channel near the air outlet, the pressure-maintaining device comprises a mounting seat, a spring and a valve, the mounting seat is installed in the gas channel, a transverse cavity is arranged at one end of the mounting seat near the air outlet, the spring and the valve are arranged at the transverse cavity Into the cavity, the valve is slidingly and sealingly connected to the transverse cavity, the two ends of the spring are respectively against the valve and the transverse cavity, the valve can open and close the air outlet, the side wall of the mounting seat is provided with a first balancing hole connected to the transverse cavity, the side wall of the valve body is provided with a second balancing hole connected to the first balancing hole, the two sides of the mounting seat located at the connection between the first balancing hole and the second balancing hole are respectively sealed with the inner wall of the gas channel, and the mounting seat is provided with a vent hole that runs through the mounting seat on the outside of the transverse cavity.

[0007] Preferably, a ventilation groove is provided on the outer side of the mounting seat, the first balance hole and the second balance hole are respectively connected to the ventilation groove, and a first sealing ring is provided on the mounting seat between the inner wall of the gas channel and the two sides of the ventilation groove.

[0008] Preferably, the ventilation groove is arranged along the circumference of the mounting seat.

[0009] Preferably, a second sealing ring is provided between the valve and the inner wall of the transverse cavity.

[0010] Preferably, the gas passage runs through the valve cavity transversely, and a longitudinal through hole is provided at the rear of the mounting seat, and the through hole is used for the valve core to pass through.

[0011] Preferably, the mounting seat is a column, the outer contour of the front portion of the mounting seat matches the gas passage near the gas outlet, and the upper and lower surfaces of the rear portion of the mounting seat are planes.

[0012] Preferably, a first step surface is provided on the mounting seat, a second step surface abutting against the first step surface is provided in the gas channel, and one end of the gas channel away from the gas outlet is closed by a plug, and the plug abuts against the mounting seat.

[0013] Preferably, a central axis of the pressure maintaining device and a central axis of the valve core are in the same vertical plane.

[0014] Preferably, the valve core control mechanism includes a valve stem and a handwheel, the valve stem and the valve core are located in the valve cavity, one end of the valve stem is transmission connected to the valve core, and the other end is fixedly connected to the handwheel, and the top of the valve cavity is provided with a pressure cap matching the valve stem, and the top of the valve core is threadedly connected to the valve cavity.

[0015] Preferably, a first valve seat is provided at the bottom of the valve cavity for cooperating with the valve core to close the air inlet; a second valve seat is provided at the side of the air outlet close to the gas channel for cooperating with the valve to close the air outlet.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] In the utility model, the transverse cavity is only connected to the atmosphere outside the valve body through the first balance hole and the second balance hole. The high-pressure gas in the gas channel will push the valve to the bottom of the transverse cavity. The opening degree of the valve is large, and the opening degree of the valve is only related to the pressure in the bottle and is not affected by the flow rate and pressure at the gas outlet. Frequent opening and closing of the valve and pressure fluctuations at the gas outlet are avoided, thereby increasing the service life of the spring. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the cross-sectional structure of the utility model in one direction;

[0019] Figure 2 It is a schematic diagram of the cross-sectional structure of the utility model in another direction;

[0020] Figure 3 for Figure 1 A magnified view of the structure of part A;

[0021] Figure 4 It is a structural schematic diagram of the mounting seat in the utility model.

[0022] Description of Reference Numerals

[0023] 1-valve body, 2-valve core, 3-air inlet, 4-air outlet, 5-valve chamber, 6-gas channel, 7-mounting seat, 8-spring, 9-valve, 10-transverse cavity, 11-first balancing hole, 12-second balancing hole, 13-vent, 14-vent groove, 15-first sealing ring, 16-second sealing ring, 17-through hole, 18-first step surface, 19-second step surface, 20-plug, 21-valve stem, 22-handwheel, 23-pressure cap, 24-first valve seat, 25-second valve seat. DETAILED DESCRIPTION

[0024] The present invention is further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the present application.

[0025] like Figures 1 to 4 As shown, a pressure-maintaining gas cylinder valve comprises a valve body 1, a valve core 2 and a valve core 2 control mechanism, wherein the valve body 1 is provided with an air inlet 3, an air outlet 4, a valve cavity 5 and a gas channel 6 connecting the air inlet 3 and the air outlet 4, the valve core 2 is arranged in the valve cavity 5, and is driven by the valve core 2 control mechanism to switch the air inlet 3; a pressure-maintaining device is arranged near the air outlet 4 in the gas channel 6, and the pressure-maintaining device comprises a mounting seat 7, a spring 8 and a valve 9, the mounting seat 7 is installed in the gas channel 6, and a transverse cavity 10 is arranged at one end of the mounting seat 7 near the air outlet 4, the spring 8 and the valve 9 are arranged in the transverse cavity 10, and the valve 9 is connected to the transverse cavity 10. The cavity 10 is slidably sealed and connected, and the two ends of the spring 8 are respectively against the valve 9 and the transverse cavity 10, and the valve 9 can open and close the air outlet 4. The side wall of the mounting seat 7 is provided with a first balancing hole 11 connected to the transverse cavity 10, and the side wall of the valve body 1 is provided with a second balancing hole 12 connected to the first balancing hole 11. The two sides of the mounting seat 7 located at the connection between the first balancing hole 11 and the second balancing hole 12 are respectively sealed with the inner wall of the gas channel 6 to ensure that the transverse cavity 10 is only connected to the atmosphere outside the valve body 1, and the mounting seat 7 is provided with a vent hole 13 that penetrates the mounting seat 7 on the outside of the transverse cavity 10 for the high-pressure gas in the bottle to pass through.

[0026] When the gas cylinder valve is deflated, the valve core 2 is driven by the valve core 2 control mechanism to open the gas inlet 3, the gas inlet 3 and the gas channel 6 are connected, and the high-pressure gas in the gas cylinder enters the gas channel 6. The thrust of the gas on the valve 9 into the transverse cavity 10 is much greater than the thrust of the spring 8 on the valve 9 out of the transverse cavity 10. Therefore, the valve 9 moves into the transverse cavity 10, the valve 9 is separated from the gas outlet 4, the gas channel 6 is connected with the gas outlet 4, and the gas is discharged from the gas outlet 4. In this process, since the transverse cavity 10 is only connected to the atmosphere outside the valve body 1 through the first balance hole 11 and the second balance hole 12, the high-pressure gas in the gas channel 6 will push the valve 9 to the bottom of the transverse cavity 10, the opening degree of the valve 9 is large, and the opening degree of the valve 9 is only related to the pressure in the bottle, and is not affected by the flow rate and pressure at the gas outlet 4, so that the valve 9 is frequently opened and closed, and the pressure fluctuation at the gas outlet 4 is avoided, and the service life of the spring 8 is increased. When the pressure in the gas cylinder drops to the set holding pressure, the thrust of the spring 8 on the valve 9 is greater than the thrust of the gas on the valve 9, pushing the valve 9 toward the gas outlet 4. The valve 9 automatically closes the gas outlet 4, and the low-pressure gas in the gas cylinder will be maintained in the gas cylinder to prevent the gas in the gas cylinder from being completely used up and causing air to flow into the gas cylinder.

[0027] Specifically, a vent groove 14 is provided on the outside of the mounting seat 7, and the vent groove 14 can be arranged along the circumference of the mounting seat 7. The first balance hole 11 and the second balance hole 12 are respectively connected to the vent groove 14. A first sealing ring 15 is provided between the two sides of the vent groove 14 on the mounting seat 7 and the inner wall of the gas channel 6, and a second sealing ring 16 is provided between the valve 9 and the inner wall of the transverse cavity 10. The transverse cavity 10 is only connected to the atmosphere outside the valve body 1 through the first balance hole 11, the vent groove 14 and the second balance hole 12 in sequence.

[0028] In some embodiments, the gas channel 6 transversely penetrates the valve cavity 5 , and a longitudinal through hole 17 is provided at the rear of the mounting seat 7 , and the through hole 17 is used for the valve core 2 to pass through.

[0029] In some embodiments, the mounting seat 7 is a column, the outer contour of the front of the mounting seat 7 matches the gas channel 6 near the gas outlet 4, and the upper and lower surfaces of the rear of the mounting seat 7 are flat to facilitate gas circulation.

[0030] In some embodiments, the mounting seat 7 is provided with a first step surface 18, and the gas channel 6 is provided with a second step surface 19 that abuts against the first step surface 18. The first step surface 18 and the second step surface 19 cooperate to position the mounting seat 7. The end of the gas channel 6 away from the gas outlet 4 is closed by a plug 20, and the plug 20 abuts against the mounting seat 7 to fix the mounting seat 7. When installing the mounting seat 7, the mounting seat 7 is inserted into the gas channel 6, the two step surfaces are fitted together, and then the plug 20 is installed to achieve accurate positioning of the mounting seat 7, and the installation is convenient and quick.

[0031] In some embodiments, the central axis of the pressure maintaining device and the central axis of the valve core 2 are in the same vertical plane, which can reduce the volume of the gas cylinder valve and save manufacturing costs.

[0032] In some embodiments, the valve core 2 control mechanism includes a valve stem 21 and a hand wheel 22. The valve stem 21 and the valve core 2 are located in the valve cavity 5. One end of the valve stem 21 is drivingly connected to the valve core 2, and the other end is fixedly connected to the hand wheel 22. The top of the valve cavity 5 is provided with a pressure cap 23 matching the valve stem 21. The top of the valve core 2 is threadedly connected to the valve cavity 5. The outer side of the top of the valve core 2 is provided with an external thread matching the internal thread of the valve cavity 5. When the hand wheel 22 drives the valve stem 21 to rotate, under the action of the thread, the valve core 2 rotates and moves along its axis, realizing the up and down movement of the valve core 2, thereby opening or closing the air inlet 3.

[0033] In some embodiments, a first valve seat 24 is provided at the bottom of the valve cavity 5, which is used to cooperate with the valve core 2 to close the air inlet 3; a second valve seat 25 is provided at the side of the air outlet 4 close to the gas channel 6, which is used to cooperate with the valve 9 to close the air outlet 4. Specifically, the valve body 1 at the bottom of the valve cavity 5 is integrally formed with an annular protrusion, which serves as the first valve seat 24, and the valve core 2 cooperates with the first valve seat 24 to open or close the air inlet 3. The air outlet 4 is integrally formed with an inner conical surface at one end close to the gas channel 6, which serves as the second valve seat 25. The end of the valve 9 close to the air outlet 4 matches the second valve seat 25, and a sealing ring is provided to meet the sealing requirements.

Claims

1. A pressure-maintaining gas cylinder valve, comprising a valve body, a valve core and a valve core control mechanism, wherein the valve body is provided with an air inlet, an air outlet, a valve cavity and a gas channel connecting the air inlet and the air outlet, the valve core is arranged in the valve cavity and driven by the valve core control mechanism to open and close the air inlet; a pressure-maintaining device is arranged in the gas channel near the air outlet, characterized in that: The pressure maintaining device includes a mounting seat, a spring and a valve, the mounting seat is installed in the gas channel, a transverse cavity is provided at one end of the mounting seat close to the gas outlet, the spring and the valve are arranged in the transverse cavity, the valve is slidingly and sealingly connected to the transverse cavity, the two ends of the spring are respectively abutted against the valve and the transverse cavity, the valve can open and close the gas outlet, a first balancing hole connected to the transverse cavity is provided on the side wall of the mounting seat, a second balancing hole connected to the first balancing hole is provided on the side wall of the valve body, a seal is formed between the inner wall of the gas channel on both sides of the mounting seat at the connection point between the first balancing hole and the second balancing hole, and a vent hole penetrating the mounting seat is provided on the outside of the transverse cavity.

2. A pressure-maintaining gas cylinder valve according to claim 1, characterized in that: A ventilation groove is arranged on the outer side of the mounting seat, the first balance hole and the second balance hole are respectively connected to the ventilation groove, and a first sealing ring is arranged on both sides of the ventilation groove on the mounting seat and between the inner wall of the gas channel.

3. A pressure-maintaining gas cylinder valve according to claim 2, characterized in that: The ventilation groove is arranged along the circumference of the mounting seat.

4. A pressure-maintaining gas cylinder valve according to claim 1, characterized in that: A second sealing ring is provided between the valve and the inner wall of the transverse cavity.

5. The pressure-maintaining gas cylinder valve according to claim 1, characterized in that: The gas passage runs through the valve cavity transversely, and a longitudinal through hole is provided at the rear of the mounting seat, and the through hole is used for the valve core to pass through.

6. A pressure-maintaining gas cylinder valve according to claim 5, characterized in that: The mounting seat is a column, the outer contour of the front portion of the mounting seat matches the gas channel near the gas outlet, and the upper and lower surfaces of the rear portion of the mounting seat are planes.

7. The pressure-maintaining gas cylinder valve according to claim 5, characterized in that: The mounting seat is provided with a first step surface, the gas channel is provided with a second step surface which abuts against the first step surface, and one end of the gas channel away from the gas outlet is closed by a plug, and the plug abuts against the mounting seat.

8. The pressure-maintaining gas cylinder valve according to claim 5, characterized in that: The central axis of the pressure maintaining device and the central axis of the valve core are in the same vertical plane.

9. The pressure-maintaining gas cylinder valve according to claim 1, characterized in that: The valve core control mechanism includes a valve stem and a handwheel. The valve stem and the valve core are located in the valve cavity. One end of the valve stem is transmission-connected to the valve core, and the other end is fixedly connected to the handwheel. A pressure cap matching the valve stem is provided on the top of the valve cavity, and the top of the valve core is threadedly connected to the valve cavity.

10. The pressure-maintaining gas cylinder valve according to claim 1, characterized in that: A first valve seat is provided at the bottom of the valve cavity for cooperating with the valve core to close the air inlet; a second valve seat is provided at the side of the air outlet close to the gas channel for cooperating with the valve to close the air outlet.

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