Pressure maintaining type gas cylinder valve

Abstract

The utility model discloses a pressure maintaining type gas cylinder valve which comprises a shell, a limiting cavity, a cavity, a ventilation cavity, a main valve diaphragm upper cavity, a main valve diaphragm lower cavity and a communication cavity are sequentially arranged in the shell from top to bottom, an air inlet cavity and an air outlet cavity are arranged on the two sides of the communication cavity respectively, a diaphragm is arranged in the cavity, and the air inlet cavity is communicated with the air outlet cavity. A sliding valve is arranged in the middle of the diaphragm, and a pressure regulating mechanism used for driving the sliding valve to move up and down is arranged in the limiting cavity. The pressure stabilizing precision is high, the output pressure fluctuation of the valve port is small under external interference, the dynamic stability is good, and when factors such as the input pressure and the output flow of the gas cylinder valve change suddenly, the dynamic stability of the gas cylinder valve can be kept.

Description

Technical Field

[0001] The utility model belongs to the technical field of gas cylinder valves, and particularly relates to a pressure-maintaining gas cylinder valve. Background Technique

[0002] A gas cylinder valve refers to a valve installed on a gas cylinder to control the on-off and flow rate of gas. Also known as a "bottle valve", gas cylinder valves of different structures are generally used for gas cylinders with different media. It has a simple structure, small size, high strength, a working temperature of -40 - 60 °C, and the material can adapt to the physical and chemical characteristics requirements of the medium, and copper is commonly used.

[0003] At present, for existing gas cylinder valves, it is necessary to reduce the spring stiffness and increase the effective area of the balance diaphragm to have the flow characteristics of pressure maintenance and improve the voltage stabilization accuracy. However, the pressure regulation characteristics of this type of gas cylinder valve are not good, and the fluctuation of the output pressure increases with the increase of the fluctuation of the input pressure. However, to keep the pressure regulation range unchanged, when increasing the effective area of the diaphragm, the corresponding pressure regulation spring stiffness also needs to be increased, which will lead to the deterioration of the flow characteristics. Content of the Utility Model

[0004] The purpose of the utility model is to provide a pressure-maintaining gas cylinder valve to solve the technical problems raised in the background technique.

[0005] To achieve the above purpose, the specific technical solution of the utility model is as follows: A pressure-maintaining gas cylinder valve includes a housing. Inside the housing, a limit cavity, a cavity, a ventilation cavity, an upper cavity of the main valve diaphragm, a lower cavity of the main valve diaphragm, and a communication cavity are sequentially arranged from top to bottom. An air inlet cavity and an air outlet cavity are respectively arranged on both sides of the communication cavity. A diaphragm is arranged in the cavity, a slide valve is arranged in the middle of the diaphragm, a pressure regulation mechanism for driving the slide valve to move up and down is arranged in the limit cavity, a pilot valve seat is arranged in the ventilation cavity, a pilot valve spool that slides up and down is arranged in the pilot valve seat, the top of the pilot valve spool is connected to the bottom of the diaphragm, a pilot valve return spring is arranged between the bottom of the pilot valve spool and the inner wall of the bottom of the ventilation cavity, a main valve diaphragm is arranged between the upper cavity of the main valve diaphragm and the lower cavity of the main valve diaphragm, the air inlet cavity is connected to the air outlet cavity through the communication cavity, a main valve seat is arranged in the communication cavity, a main valve spool that can move up and down is arranged in the main valve seat, the top of the main valve spool is connected to the bottom of the main valve diaphragm, and the bottom of the main valve spool is connected to the inner wall of the bottom of the communication cavity through a main valve return spring.

[0006] Preferably, the right end of the air inlet cavity is connected to the left side of the communication cavity, and the left top end of the air outlet cavity is connected to the top end of the communication cavity.

[0007] Preferably, an inlet pipe is arranged on one side of the housing where the air inlet cavity is located, and an outlet pipe is arranged on one side of the housing where the air outlet cavity is located.

[0008] Preferably, the pressure regulating mechanism includes a handwheel located above the housing. A pressure regulating rod is provided at the bottom of the handwheel, and the bottom of the pressure regulating rod extends into the inner cavity of the limiting cavity and is connected with a pressing block. The bottom of the pressing block is connected to the slide valve through a pressure regulating spring, and the top of the slide valve is slidably connected to the limiting cavity up and down.

[0009] Preferably, a threaded hole is provided in the middle of the top end of the housing. The surface of the pressure regulating rod is provided with an external thread, and the pressure regulating rod is threadedly connected to the threaded hole through the external thread. The bottom of the pressure regulating rod is rotatably connected to the upper surface of the pressing block.

[0010] Preferably, the air inlet cavity is communicated with the left bottom of the air vent cavity through a first flow channel, and the right bottom of the cavity is communicated with the right top end of the upper cavity of the main valve diaphragm through a second flow channel.

[0011] The pressure maintaining type gas cylinder valve of the present invention has the following advantages:

[0012] The present invention has a relatively high pressure stability accuracy, and the output pressure fluctuation at the valve port is small under external interference, and the dynamic stability is good. When factors such as the input pressure and output flow of the gas cylinder valve change suddenly, the gas cylinder valve can maintain dynamic stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention, and thus should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0014] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0015] Explanation of the reference numerals in the figure: 1. Housing; 2. Cavity; 3. Handwheel; 4. Pressure regulating rod; 5. Pressing block; 6. Pressure regulating spring; 7. Limiting cavity; 8. Slide valve; 9. Diaphragm; 10. Air vent cavity; 11. Pilot valve seat; 12. Pilot valve spool; 13. Pilot valve return spring; 14. Upper cavity of the main valve diaphragm; 15. Lower cavity of the main valve diaphragm; 16. Main valve diaphragm; 17. First flow channel; 18. Second flow channel; 19. Air inlet cavity; 20. Air outlet cavity; 21. Inlet pipe; 22. Outlet pipe; 23. Main valve seat; 24. Main valve spool; 25. Main valve return spring; 26. Communication cavity. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] In the following text, only some exemplary embodiments are briefly described. As those skilled in the art can recognize, the described embodiments can be modified in various different ways without departing from the spirit or scope of the embodiments of the present invention. Therefore, the drawings and the description are considered to be exemplary in nature rather than restrictive.

[0017] In the description of the embodiments of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as "length", "vertical", "horizontal", "top", "bottom", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the embodiments of the present invention.

[0018] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the embodiments of the present invention, the meaning of "a plurality" is two or more unless otherwise specifically defined.

[0019] In the embodiments of the present invention, unless otherwise clearly specified and defined, terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection, an electrical connection, or a communication connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0020] The following disclosure provides many different embodiments or examples for implementing different structures of the embodiments of the present invention. To simplify the disclosure of the embodiments of the present invention, the components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit the embodiments of the present invention. In addition, the embodiments of the present invention may repeat reference numerals and / or reference letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0021] To better understand the purpose, structure, and function of the present invention, the following further describes a pressure-holding gas cylinder valve of the present invention in detail with reference to the drawings.

[0022] As Figure 1As shown in the figure, a pressure-holding gas cylinder valve of the present utility model includes a housing 1. Inside the housing 1, a limiting cavity 7, a cavity 2, a ventilation cavity 10, an upper cavity 14 of the main valve diaphragm, a lower cavity 15 of the main valve diaphragm, and a communication cavity 26 are sequentially arranged from top to bottom. An intake cavity 19 and an outlet cavity 20 are respectively arranged on both sides of the communication cavity 26. The right end of the intake cavity 19 is communicated with the left side of the communication cavity 26, and the left top end of the outlet cavity 20 is communicated with the top end of the communication cavity 26. An intake pipe 21 is arranged on one side of the housing 1 where the intake cavity 19 is located, and an outlet pipe 22 is arranged on one side of the housing 1 where the outlet cavity 20 is located. A diaphragm 9 is arranged in the cavity 2, a slide valve 8 is arranged in the middle of the diaphragm 9, and a pressure regulating mechanism for driving the slide valve 8 to move up and down is arranged in the limiting cavity 7. The pressure regulating mechanism includes a handwheel 3. The handwheel 3 is located above the housing 1. A pressure regulating rod 4 is arranged at the bottom of the handwheel 3. The bottom of the pressure regulating rod 4 extends into the inner cavity of the limiting cavity 7 and is connected with a pressing block 5. A pressure regulating spring 6 is connected between the bottom of the pressing block 5 and the slide valve 8, and the top end of the slide valve 8 is slidably connected with the limiting cavity 7 up and down. A threaded hole is arranged in the middle of the top end of the housing 1. The surface of the pressure regulating rod 4 is provided with an external thread. The pressure regulating rod 4 is threadedly connected with the threaded hole through the external thread, and the bottom of the pressure regulating rod 4 is rotatably connected with the upper surface of the pressing block 5. By rotating the handwheel 3, the pressure regulating rod 4 rotates. Since the pressure regulating rod 4 is threadedly connected with the threaded hole at the top end of the housing 1, the pressure regulating rod 4 drives the pressing block 5 to move up and down, so that the pressing block 5 compresses or pulls the pressure regulating spring 6, and then the pressure regulating spring 6 drives the slide valve 8 to move up and down to realize the adjustment of pressure.

[0023] A pilot valve seat 11 is arranged in the ventilation cavity 10. A pilot valve spool 12 that slides up and down is arranged in the pilot valve seat 11. The top end of the pilot valve spool 12 is connected with the bottom of the diaphragm 9. A pilot valve return spring 13 is arranged between the bottom of the pilot valve spool 12 and the inner wall of the bottom of the ventilation cavity 10. A main valve diaphragm 16 is arranged between the upper cavity 14 of the main valve diaphragm and the lower cavity 15 of the main valve diaphragm. The intake cavity 19 and the outlet cavity 20 are communicated through the communication cavity 26. A main valve seat 23 is arranged in the communication cavity 26. A main valve spool 24 that can move up and down is arranged in the main valve seat 23. The top end of the main valve spool 24 is connected with the bottom of the main valve diaphragm 16. A main valve return spring 25 is connected between the bottom of the main valve spool 24 and the inner wall of the bottom of the communication cavity 26. The intake cavity 19 is communicated with the left bottom of the ventilation cavity 10 through a first flow channel 17. The right bottom of the cavity 2 is communicated with the right top of the upper cavity 14 of the main valve diaphragm through a second flow channel 18. Through the cooperation of the first flow channel 17 and the second flow channel 18, gas can enter the ventilation cavity 10 through the first flow channel 17 from the intake cavity 19, then enter the cavity 2 through the pilot valve seat 11, and finally enter the upper cavity 14 of the main valve diaphragm through the second flow channel 18 for pressure application.

[0024] The working principle of the pressure-holding gas cylinder valve: Figure 1The position shown is the closed state with no pressure output. Rotate the handwheel 3 clockwise, and the pressure regulating spring 6 compresses to push the slide valve 8 to move downward. The pilot valve spool 12 opens, and the gas enters the upper chamber 14 of the main valve diaphragm through the air inlet chamber 19, the first flow passage 17, the ventilation chamber 10, the pilot valve seat 11, the cavity 2, and the second flow passage 18. Under the action of pressure, the main valve diaphragm 16 is forced to move downward to push the main valve spool 24, and the main valve opens. The gas passes through the throttle of the main valve orifice, and there is pressure output in the air outlet chamber 20. If the pressure in the air outlet chamber 20 is less than the pressure in the upper chamber 14 of the main valve diaphragm, the main valve spool 24 moves downward, the valve opening increases, the throttling effect weakens, and the pressure in the air outlet chamber 20 rises; conversely, if the pressure in the air outlet chamber 20 is greater than the pressure in the upper chamber 14 of the main valve diaphragm, the main valve spool 24 moves upward, the valve opening becomes smaller, the throttling effect increases, and the pressure in the air outlet chamber 20 decreases; in short, this gas cylinder valve is a dynamic balance process until the target pressure is reached to achieve the pressure holding effect.

[0025] It can be understood that the present invention is described through some embodiments. Those skilled in the art know that without departing from the spirit and scope of the present invention, various changes or equivalent replacements can be made to these features and embodiments. Additionally, under the teaching of the present invention, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application belong to the scope protected by the present invention.

Claims

1. A pressure-maintaining gas cylinder valve, characterized in that: The invention comprises a housing (1), wherein the housing (1) is provided with a limit cavity (7), a cavity (2), a vent cavity (10), an upper cavity (14) of a main valve diaphragm, a lower cavity (15) of a main valve diaphragm and a connecting cavity (26) in order from top to bottom, wherein an air inlet cavity (19) and an air outlet cavity (20) are provided on both sides of the connecting cavity (26), respectively, a diaphragm (9) is provided in the cavity (2), a slide valve (8) is provided in the middle of the diaphragm (9), a pressure regulating mechanism for driving the slide valve (8) to move up and down is provided in the limit cavity (7), a pilot valve seat (11) is provided in the vent cavity (10), a pilot valve core (12) which slides up and down is provided in the pilot valve seat (11), and the top end of the pilot valve core (12) is connected to the valve core (12). The bottom of the diaphragm (9) is connected, a pilot valve reset spring (13) is arranged between the bottom of the pilot valve core (12) and the bottom inner wall of the ventilation chamber (10), a main valve diaphragm (16) is arranged between the main valve diaphragm upper chamber (14) and the main valve diaphragm lower chamber (15), the air inlet chamber (19) and the air outlet chamber (20) are connected through a connecting chamber (26), a main valve seat (23) is arranged in the connecting chamber (26), a main valve core (24) that can move up and down is arranged in the main valve seat (23), the top of the main valve core (24) is connected to the bottom of the main valve diaphragm (16), and the bottom of the main valve core (24) is connected to the bottom inner wall of the connecting chamber (26) through a main valve reset spring (25).

2. A pressure-maintaining gas cylinder valve according to claim 1, characterized in that: The right end of the air inlet cavity (19) is in communication with the left side of the connecting cavity (26), and the left top end of the air outlet cavity (20) is in communication with the top end of the connecting cavity (26).

3. A pressure-maintaining gas cylinder valve according to claim 1, characterized in that: An air inlet pipe (21) is provided on one side of the shell (1) located at the air inlet cavity (19), and an air outlet pipe (22) is provided on one side of the shell (1) located at the air outlet cavity (20).

4. A pressure-maintaining gas cylinder valve according to claim 1, characterized in that: The pressure regulating mechanism comprises a hand wheel (3), the hand wheel (3) being located above the housing (1), a pressure regulating rod (4) being arranged at the bottom of the hand wheel (3), the bottom of the pressure regulating rod (4) extending into the inner cavity of the limiting cavity (7) and being connected to a pressure block (5), the bottom of the pressure block (5) being connected to a slide valve (8) via a pressure regulating spring (6), and the top of the slide valve (8) being connected to the limiting cavity (7) in an up-and-down sliding manner.

5. A pressure-maintaining gas cylinder valve according to claim 4, characterized in that: A threaded hole is provided at the middle portion of the top end of the housing (1), an external thread is provided on the surface of the pressure regulating rod (4), the pressure regulating rod (4) is threadedly connected to the threaded hole via the external thread, and the bottom of the pressure regulating rod (4) is rotatably connected to the upper surface of the pressure block (5).

6. The pressure-maintaining gas cylinder valve according to claim 1, characterized in that: The air inlet cavity (19) is connected to the left bottom of the ventilation cavity (10) through the first flow channel (17), and the right bottom of the cavity (2) is connected to the right top of the main valve diaphragm upper cavity (14) through the second flow channel (18).

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