Bottle valve with bidirectional pressure transformation function

Abstract

The bottle head valve with the bidirectional pressure transformation function comprises a valve body, a pressure reduction piston and a valve element, the valve body is provided with a valve cavity penetrating through the upper end and the lower end of the valve body, the pressure reduction piston is inserted into the upper end of the valve cavity, and the valve element is arranged at the lower end of the valve cavity; the pressure reducing piston and the valve core can move up and down in the valve cavity under the action of gas pressure; when gas is inflated from top to bottom, under the action of gas pressure, the pressure reduction piston and the valve element move downwards by different distances, so that the bottom of the pressure reduction piston is separated from the top of the valve element; when the air is deflated from bottom to top, the pressure reduction piston moves upwards to a pressure balance point due to different diameters of the two ends. According to the bottle head valve, the bidirectional pressure transformation function can be achieved, a gas pressure reducing valve does not need to be disassembled and assembled in the gas filling, storing, transporting and using processes, the use experience of a user is improved, safety and reliability are improved, and the bottle head valve has good market competitiveness.

Description

Technical Field

[0001] The utility model relates to the fields of gas filling, storage, transportation and use, and particularly relates to a bottle head valve. Background Technique

[0002] Based on the characteristics of gases and their requirements for filling, storage, transportation and use, it is usually necessary to first compress the gases, fill, store and transport them with high-pressure steel cylinders (gas storage tanks). When the gases are transported to the application terminals, it is necessary to install gas pressure reducing valves to reduce the pressure, that is, to change the gases from high pressure to low pressure; after the customer uses up the gases in the high-pressure steel cylinder, it is usually necessary to remove the gas pressure reducing valve and return to the gas filling station to refill the empty steel cylinder with high-pressure gases. When using again, install the gas pressure reducing valve again to meet the use requirements.

[0003] The application method of the traditional high-pressure steel cylinder plus gas pressure reducing valve has the disadvantages that the connection part between the high-pressure steel cylinder and the gas pressure reducing valve is high-pressure gas, which involves high-pressure gas sealing, and it is generally installed by the end user himself. Due to the uneven professional qualities and professional abilities of the end users, the connection part often leaks, resulting in gas waste and even safety problems; secondly, the high-pressure steel cylinder and the gas pressure reducing valve need to be disassembled and assembled repeatedly, and the service life and reliability are not ideal. How to further optimize the structure of the bottle head valve of the high-pressure steel cylinder, improve the safety, usability and reliability of the product, and realize the rapid filling of high-pressure gases with lower cost and more convenient use experience is a topic that has been explored and solved in the industry. Content of the Utility Model

[0004] In order to solve the problems in the background technique, the utility model provides a bottle head valve with a two-way pressure conversion function. The bottle head valve can realize the two-way pressure conversion function, enable the gases not to need to disassemble and assemble the gas pressure reducing valve during the processes of filling, storage, transportation and use, improve the use experience of users, improve the safety and reliability, and has good market competitiveness.

[0005] To achieve the above purpose, the utility model adopts the following technical scheme:

[0006] A bottle head valve with a two-way pressure conversion function, including a valve body, a pressure reducing piston and a valve core. It is characterized in that the valve body has a valve cavity penetrating through the upper and lower ends of the valve body. The upper end of the valve cavity is inserted with a pressure reducing piston. The pressure reducing piston has a thick end and a thin end. The thin end is inserted into the valve cavity, and the thick end is located outside the valve cavity. The lower end of the valve cavity is provided with a valve core; an air passage is provided in the pressure reducing piston, and a valve core cavity is provided in the valve core. When the bottom of the pressure reducing piston is in contact with the top of the valve core, the air passage and the valve core cavity are isolated;

[0007] The pressure reducing piston and the valve core can move up and down in the valve cavity under the action of gas pressure;

[0008] When inflating from top to bottom, under the action of gas pressure, the pressure reducing piston and the valve core move downward by different distances, causing the bottom of the pressure reducing piston to separate from the top of the valve core. At this time, the air passage is communicated with the valve core cavity, and the external high-pressure gas enters the bottle body through the air passage and the valve core cavity to achieve high-pressure inflation.

[0009] When deflating from bottom to top, the pressure reducing piston moves upward to the pressure balance point due to the different diameters at both ends, and the high-pressure gas in the bottle is discharged through the valve core cavity and the air passage to achieve pressure reduction and deflation.

[0010] A valve cover is provided at the upper end of the pressure reducing piston. The valve cover is sleeved on the valve body, and the thick end of the pressure reducing piston is arranged in the cavity between the valve cover and the valve body.

[0011] A first spring is arranged between the thick end of the pressure reducing piston and the valve body.

[0012] A limit screw is installed at the bottom of the valve body, and the limit screw restricts the valve core in the valve cavity.

[0013] A second spring is arranged between the valve core and the limit screw.

[0014] An installation nut is connected to the top of the valve cover, and the bottle head valve is fastened to the opening of the bottle body through the installation nut.

[0015] The air passage has an upper opening at the center of the top of the pressure reducing piston, and a lower annular opening on the outer wall of the bottom of the pressure reducing piston; the upper opening and the lower annular opening are connected through a vertical air passage and a horizontal air passage.

[0016] The annular opening is an annular gap formed between the inner wall of the valve cavity and the outer wall of the lower end of the pressure reducing piston after the outer wall of the lower end of the pressure reducing piston shrinks.

[0017] A seal is provided at the center of the bottom of the pressure reducing piston; the top of the valve core has a front cone of the valve core, and the valve core cavity is provided with an upper opening of the valve core cavity on the front cone of the valve core; when the bottom of the pressure reducing piston fits with the top of the valve core, the seal closes the upper opening of the valve core cavity on the front cone of the valve core.

[0018] Annular grooves are provided on the outer walls of both the pressure reducing piston and the valve core, and sealing rings are arranged in the annular grooves.

[0019] The bottle head valve described in the present utility model is installed inside the upper end of a high-pressure steel cylinder. When gas flows from the outside of the steel cylinder into the steel cylinder, the gas pressure will not change, and normal filling can be achieved; when gas flows from the inside of the steel cylinder to the outside of the steel cylinder, the gas pressure changes from high pressure to low pressure, and normal use can be achieved. During the processes of gas filling, storage, transportation, and use, there is no need to disassemble and assemble the gas pressure reducing valve again, which improves the user experience, enhances safety and reliability, and has good market competitiveness. Description of the Drawings

[0020] The present utility model will be further described below in conjunction with the drawings.

[0021] Figure 1 It is a schematic cross-sectional structure diagram of the bottle head valve described in Embodiment 1 of the present utility model;

[0022] Wherein:

[0023] Valve body 10, pressure reducing piston 20, thick end 21, thin end 22, vertical air passage 23, horizontal air passage 24, lower annular opening 25, seal 26, first spring 27, valve core 30, valve core cavity 31, second spring 32, front cone portion 33 of the valve core, limit screw 40, valve cover 50, mounting nut 60. Specific Embodiments

[0024] The present utility model will be further described below in conjunction with the description of the drawings and specific embodiments:

[0025] Embodiment 1

[0026] As Figure 1 shown, the present utility model provides a bottle head valve with a two-way pressure-changing function, including a valve body 10, a pressure reducing piston 20, and a valve core 30. The valve body 10 has a valve cavity penetrating through the upper and lower ends of the valve body. The upper end of the valve cavity is inserted with a pressure reducing piston 20. The pressure reducing piston has a thick end and a thin end. The thin end 22 is inserted into the valve cavity, and the thick end 21 is located outside the valve cavity. The lower end of the valve cavity is provided with a valve core 30; the pressure reducing piston 20 has an air passage, and the air passage has an upper opening at the center of the top of the pressure reducing piston 20, and the air passage has a lower annular opening 25 on the outer wall of the bottom of the pressure reducing piston 20; the upper opening and the lower annular opening 25 are connected by a vertical air passage 23 and a horizontal air passage 24. The lower annular opening 25 is an annular gap formed between the inner wall of the valve cavity after the outer wall of the lower end of the pressure reducing piston 20 is retracted, and the valve core 30 has a valve core cavity 31 penetrating through the valve core 30.

[0027] The bottom center of the pressure-reducing piston 20 is provided with a seal 26; the top of the valve core 30 has a valve core front-end cone 33, and the valve core cavity 31 is provided with an upper opening of the valve core cavity on the valve core front-end cone 33; when the bottom of the pressure-reducing piston 20 fits with the top of the valve core, the seal 26 closes the upper opening of the valve core cavity of the valve core front-end cone 33, and at this time, the air passage and the valve core cavity 31 are isolated;

[0028] The pressure-reducing piston 20 and the valve core 30 can move up and down in the valve cavity under the action of gas pressure;

[0029] When inflating from top to bottom, under the action of gas pressure, the pressure-reducing piston 20 and the valve core 30 move downward by different distances to separate the bottom of the pressure-reducing piston 20 from the top of the valve core 30. At this time, the air passage is communicated with the valve core cavity 31, and the external high-pressure gas enters the cylinder body through the air passage and the valve core cavity 31 to achieve high-pressure inflation;

[0030] When deflating from bottom to top, the pressure-reducing piston 20 moves upward to the pressure balance point due to the different diameters at both ends, and the high-pressure gas in the cylinder is discharged through the valve core cavity 31 and the air passage to achieve pressure-reducing deflation.

[0031] A valve cover 50 is arranged at the upper end of the pressure-reducing piston 20. The valve cover 50 is sleeved on the valve body 10, and the thick end 21 of the pressure-reducing piston 20 is arranged in the cavity between the valve cover 50 and the valve body 10.

[0032] A first spring 27 is arranged between the thick end 21 of the pressure-reducing piston 20 and the valve body 10. A limit screw 40 is installed at the bottom of the valve body 10, and the limit screw 40 restricts the valve core 30 in the valve cavity. A second spring 32 is arranged between the valve core 30 and the limit screw 40.

[0033] The top of the valve cover 40 is connected with a mounting nut 60, and the bottle head valve is fastened to the opening of the bottle body through the mounting nut 60.

[0034] In the utility model, the pressure-reducing piston 20 and the valve core 30 are respectively designed with two moving spaces with different distances. When the gas flow direction is different, the opening degrees of the pressure-reducing piston sealing gasket and the valve core front-end cone are different.

[0035] When the gas flows from the outside of the cylinder to the inside of the cylinder (during filling), under the action of pressure, the pressure-reducing piston 20 and the valve core 30 respectively move downward to the lower limit points (the pressure-reducing piston is limited by the thick end against the valve body, and the valve core is limited by the bottom against the limit screw). The moving distance of the valve core 30 is longer, so that the pressure-reducing piston seal 26 is far away from the valve core front-end cone 33. At this time, the opening degree is fully opened, and the bottle head valve has no pressure-reducing function, and the high-pressure gas can be filled into the cylinder at full pressure;

[0036] When the gas flows from the inside of the cylinder to the outside of the cylinder (during use), under the action of pressure, the valve core 30 moves upward to the upper limit point (the limit is achieved under the restriction of the second spring 32). Due to the different diameters at both ends of the pressure reducing piston 20, it moves upward to the pressure balance point. At this time, the gas pressures at both ends of the piston are inversely proportional to the diameters at both ends. The gas pressure at the large end is much smaller than that at the small end, thus achieving pressure reduction.

[0037] Those skilled in the art will recognize that various modifications, changes, and combinations can be made to the above embodiments without departing from the scope of the present invention, and such modifications, changes, and combinations are considered to be within the scope of the inventive concept.

Claims

1. A bottle head valve with a bidirectional pressure-changing function, comprising a valve body, a pressure-reducing piston and a valve core, characterized in that: The valve body has a valve cavity that runs through the upper and lower ends of the valve body, wherein a pressure reducing piston is inserted into the upper end of the valve cavity, and the pressure reducing piston has thick and thin ends, wherein the thin end is inserted into the valve cavity and the thick end is located outside the valve cavity, and a valve core is arranged at the lower end of the valve cavity; The pressure reducing piston has an air passage, and the valve core has a valve core cavity. When the bottom of the pressure reducing piston is in contact with the top of the valve core, the air passage and the valve core cavity are isolated. The pressure reducing piston and the valve core can move up and down in the valve cavity under the action of gas pressure; When inflating from top to bottom, under the action of gas pressure, the pressure reducing piston and the valve core move downward by different distances to separate the bottom of the pressure reducing piston from the top of the valve core. At this time, the airway is connected to the valve core cavity, and the external high-pressure gas enters the bottle body through the airway and the valve core cavity to achieve high-pressure inflation; When releasing air from bottom to top, the pressure reducing piston moves upward to the pressure balance point due to the different diameters at both ends, and the high-pressure gas in the bottle is discharged through the valve core cavity and the airway to achieve pressure reduction and deflation.

2. A bottle head valve with a bidirectional pressure-changing function as claimed in claim 1, characterized in that: The upper end of the pressure reducing piston is provided with a valve cover, and the valve cover is sleeved on the valve body. The thick end of the pressure reducing piston is arranged in the cavity between the valve cover and the valve body.

3. A bottle head valve with a bidirectional pressure-changing function as claimed in claim 2, characterized in that: A first spring is arranged between the thick end of the pressure reducing piston and the valve body.

4. A bottle head valve with a bidirectional pressure-changing function as claimed in claim 3, characterized in that: A limiting screw is installed at the bottom of the valve body, and the limiting screw limits the valve core in the valve cavity.

5. The bottle head valve with bidirectional pressure changing function as claimed in claim 4, characterized in that: A second spring is arranged between the valve core and the limiting screw.

6. A bottle head valve with a bidirectional pressure-changing function as claimed in claim 5, characterized in that: The top of the valve cover is connected with a mounting nut, and the bottle head valve is fastened to the opening of the bottle body through the mounting nut.

7. The bottle head valve with bidirectional pressure changing function as claimed in claim 1, characterized in that: The airway has an upper opening at the top center of the pressure reducing piston, and the airway has a lower annular opening on the bottom outer wall of the pressure reducing piston; the upper opening and the lower annular opening are connected through the vertical airway and the horizontal airway.

8. The bottle head valve with bidirectional pressure changing function as claimed in claim 7, characterized in that: The annular opening is an annular gap formed between the inner wall of the valve cavity and the lower end outer wall of the pressure reducing piston after the lower end outer wall is retracted.

9. The bottle head valve with bidirectional pressure changing function as claimed in claim 8, characterized in that: A sealing member is provided at the center of the bottom of the pressure reducing piston; a front end cone portion of the valve core is provided at the top of the valve core, and an upper opening of the valve core cavity is provided on the front end cone portion of the valve core; when the bottom of the pressure reducing piston fits with the top of the valve core, the sealing member closes the upper opening of the valve core cavity at the front end cone portion of the valve core.

10. The bottle head valve with bidirectional pressure changing function as claimed in claim 9, characterized in that: An annular groove is arranged on the outer wall of the pressure reducing piston and the outer wall of the valve core, and a sealing ring is arranged in the annular groove.

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