Pressure reduction assembly for gas cylinder

Abstract

The pressure reducing assembly comprises a pressure reducing valve assembly body and a split type output end cover, the pressure reducing valve assembly body is fixedly connected with the gas cylinder, a gas outlet channel is formed in the pressure reducing valve assembly body, and a jacking structure is arranged on the inner surface of the split type output end cover. When the split type output end cover and the pressure reducing valve assembly are installed in a matched mode, the jacking structure triggers and activates the pressure reducing valve assembly, and an air outlet channel in the pressure reducing valve assembly is made to be communicated. The pressure reducing valve assembly and the output end cover are designed to be of a split structure, air path conduction is achieved through the jacking structure arranged in the output end cover, the strong sealing requirement does not exist in the process that the pressure reducing valve assembly and the output end cover are matched to trigger conduction, and a user does not need to conduct strong screwing for high-pressure sealing of a port; the problems that when a common user assembles the high-pressure gas cylinder and the pressure reducing valve, high-pressure sealing is needed, and leakage is prone to being caused by misoperation, sealing piece aging and the like can be effectively solved, terminal user operation is simplified, and using convenience and safety are improved.

Description

Technical Field

[0001] This utility model belongs to the technical field of gas filling equipment, and specifically relates to a pressure reducing component for gas cylinders. Background Technology

[0002] Currently, high-pressure gas cylinders are widely used as gas sources in portable gas supply applications such as gas filling and liquid extraction. High-pressure gas cylinders typically store gases with pressures up to tens of megapascals, and these gases need to be stabilized to a safe operating pressure using a pressure reducing device before being delivered to the gas-using terminal.

[0003] The current mainstream technology mostly adopts a separate cylinder valve structure, where the pressure reducing valve assembly is assembled to the gas cylinder neck on-site by the user using threads or other methods. While this solution offers component versatility and replacement flexibility, it also brings several practical problems:

[0004] High-pressure sealing is challenging: the interface between the gas cylinder and the pressure reducing valve is a high-pressure sealing connection, which places high demands on the precision of the seals, thread fit, and user operation. If the seals are not tightened properly, aged, misaligned, or the parts are not machined correctly, leaks or gas leaks can easily occur, and even safety hazards may exist.

[0005] High user operation threshold: Non-professional users are prone to stripping threads, not tightening properly, forgetting to install sealing rings, etc. during the assembly process, which may cause the equipment to fail to conduct electricity or abnormal gas leakage.

[0006] Triggering and sealing coupling: In existing technologies, the opening of the gas outlet passage often depends on the gas passage opening after the interface is successfully sealed. Triggering and high-pressure sealing are inseparable, with a high degree of coupling and uncontrollable risks.

[0007] Limited voltage regulation or integrated functions: Simple voltage reduction structures generally lack adjustable capabilities and do not have back-end module interfaces, resulting in poor scalability.

[0008] Therefore, there is an urgent need for a modular pressure-reducing assembly structure for gas cylinders that is compact, easy to assemble, highly safe, and has good scalability, in order to address the shortcomings of existing technologies in terms of practicality, safety, and maintainability. Utility Model Content

[0009] In order to solve the above-mentioned problems in the prior art, this application provides a pressure reducing component for gas cylinders to solve the above-mentioned technical defects.

[0010] This invention proposes a pressure-reducing assembly for gas cylinders, including a pressure-reducing valve assembly and a split-type output end cap. The pressure-reducing valve assembly is fixedly connected to the gas cylinder and has an internal air outlet channel. The inner surface of the split-type output end cap has a pressure-pressing structure. When the split-type output end cap and the pressure-reducing valve assembly are installed together, the pressure-pressing structure triggers and activates the pressure-reducing valve assembly, thus opening the internal air outlet channel. By designing the pressure-reducing valve assembly and the output end cap as a split structure, and achieving airflow through the pressure-pressing structure inside the output end cap, various problems encountered by ordinary users when assembling high-pressure gas cylinders and pressure-reducing valves are effectively avoided, simplifying end-user operation and improving ease of use and safety.

[0011] In some specific embodiments, the split-type output end cap and the pressure reducing valve assembly are screwed together via a threaded connection. This threaded connection ensures a robust and reliable structure, allowing for quick installation without requiring high-precision alignment. It also enables adjustment of the pressure reducing valve's output pressure.

[0012] In some specific embodiments, the split-type output end cap includes an end cap body, an end cap valve core, and an end cap connector. The end cap body and the end cap connector are sealed together by the end cap valve core. The end cap valve core has an exhaust port inside that connects to the outlet of the end cap connector. The pressure-pressing structure is a raised structure in the middle of the inner surface of the end cap body. The exhaust port inside the end cap valve core simultaneously establishes internal conduction and external gas output paths during pressure-pressing, improving integration, sealing performance, and usage efficiency.

[0013] In some specific embodiments, an external inflation pipe and an inflation connector are also included, with both ends of the external inflation pipe being sealed and connected to the outlet of the end cap connector and the inflation connector, respectively. The external inflation pipe and inflation connector allow for flexible connection to various output terminals or gas-using devices, improving versatility and modularity, and facilitating multi-device compatibility or remote gas supply in practical use.

[0014] In some specific embodiments, the pressure reducing valve assembly includes a pressure reducing valve body, a piston seat, a piston, a valve core, and a valve core seat. The pressure reducing valve body has a cavity for accommodating the piston and valve core seat. The piston seat is installed at the opening of the cavity on one side of the piston, and a first spring is provided between the piston and the piston seat. The valve core is disposed in the air outlet channel inside the piston and valve core seat. An air outlet valve structure is provided at the bottom of the air outlet channel. A pressure-reducing structure presses against the piston seat, causing the piston to move. The valve core follows the piston's movement, pressing against the air outlet valve structure to open the air outlet channel. By using a pressure-reducing end cap to drive the piston and valve core, the gas flow is controlled, establishing an air outlet path, achieving reliable pressure reduction, and possessing a certain pressure regulating capability.

[0015] In some specific embodiments, a through hole is provided in the middle of the piston seat, and one end of the piston passes through the through hole and extends beyond the surface of the piston seat, sealingly engaging with the exhaust port of the end cap valve core. By having one end of the piston extend out of the piston seat and sealably connect with the end cap valve core, the airtightness of the output gas passage is ensured, improving the overall airtightness of the system.

[0016] In some specific embodiments, a filter element is provided at the bottom of the outlet channel, and the outlet valve structure includes an outlet valve core and a second spring, with the second spring positioned between the outlet valve core and the filter element. The filter element in the outlet channel effectively filters impurities in the high-pressure gas, preventing blockage and valve core damage, and extending the device's lifespan.

[0017] In some specific embodiments, a switching valve structure is provided on one side of the pressure reducing valve assembly. The switching valve structure includes a switching valve seat, a switching valve core, a sealing gasket, and a third spring. The switching valve seat has an interconnected axial opening and a radial through-hole. The valve core seat passes through the radial through-hole and mates with the switching valve seat. The switching valve core and the third spring are located within the axial opening, between the switching valve core and the valve core seat. By providing an independent side-outlet switching valve structure, it can be used for filling gas cylinders or connecting a pressure gauge to detect the gas pressure inside the cylinder without installing an output end cap, enhancing the system's functional expandability and safety.

[0018] In some specific embodiments, an overpressure relief valve is also provided on one side of the pressure reducing valve assembly, and the overpressure relief valve is equipped with a rupture disc. Adding an overpressure relief valve structure and configuring a rupture disc can promptly release pressure when the pressure reducing system experiences abnormal pressure rise, preventing valve body rupture or safety accidents and ensuring the overall system safety.

[0019] In some specific embodiments, the pressure reducing valve assembly is sealed to the gas cylinder neck via a threaded connection. This threaded connection ensures secure installation, easy assembly and disassembly, and strong sealing, thus improving the overall airtightness and durability of the device.

[0020] The gas cylinder pressure reducing assembly of this application adopts a split output structure and an integrated pressure reducing control valve design. Gas flow is achieved through the top pressure structure of the output end cap, and it features quick assembly and disassembly, user-friendly operation, strong airtightness, and high safety. By incorporating a filter, overpressure relief valve, side-operated independent switching valve, and multi-stage spring reset structure, the system's safety, reliability, and functional expandability are enhanced. This solution is particularly suitable for the gas supply needs of small high-pressure gas cylinders in various scenarios such as civilian, medical, and testing applications, where small size and portability are required, demonstrating significant practical value and industrialization prospects. Attached Figure Description

[0021] The accompanying drawings are included to provide a further understanding of the embodiments and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments and, together with the description, serve to explain the principles of the present invention. Other embodiments and many anticipated advantages of the embodiments will be readily recognized as they become better understood through reference to the following detailed description. Elements in the drawings are not necessarily to scale. The same reference numerals refer to corresponding similar parts.

[0022] Figure 1 This is a schematic diagram of the structure of a gas cylinder pressure reducing assembly according to an embodiment of the present invention;

[0023] Figure 2 This is a cross-sectional structural schematic diagram of a gas cylinder pressure reducing assembly according to an embodiment of the present invention;

[0024] Figure 3 This is a schematic diagram of a gas cylinder pressure reducing assembly assembled in a gas cylinder according to a specific embodiment of the present invention;

[0025] Figure 4 This is a schematic diagram illustrating the application of a gas cylinder pressure reducing assembly according to a specific embodiment of the present invention.

[0026] The meanings of the numbers in the diagram are as follows: 1-Split-type output end cap, 11-End cap body, 12-End cap connector, 13-End cap valve core, 2-Pressure reducing valve assembly, 21-Pressure reducing valve body, 22-Piston seat, 23-Piston, 24-First spring, 25-Valve core, 26-Valve core seat, 27-Outlet valve core, 28-Second spring, 29-Filter plate, 3-Overpressure relief valve, 4-Side-out top-pressure type gas cylinder switch valve, 41-Switch valve seat, 42-Switch valve core, 43-Sealing gasket, 44-Third spring, 5-Gas cylinder, 6-External inflation pipe, 7-Inflation connector. Detailed Implementation

[0027] In the following detailed description, reference is made to the accompanying drawings, which form part of the detailed description and illustrate illustrative specific embodiments in which the present invention may be practiced. In this regard, directional terms such as “top,” “bottom,” “left,” “right,” “up,” “down,” etc., are used with reference to the orientation of the described figures. Because components of the embodiments can be positioned in several different orientations, directional terms are used for illustrative purposes and are by no means limiting. It should be understood that other embodiments may be utilized or logical changes may be made without departing from the scope of the present invention. Therefore, the following detailed description should not be taken in a limiting sense, and the scope of the present invention is defined by the appended claims.

[0028] This utility model proposes a gas cylinder pressure reducing component. Figure 1A schematic diagram of a gas cylinder pressure reducing assembly according to an embodiment of the present invention is shown, as follows: Figure 1 As shown, the main structure of this gas cylinder pressure reducing assembly includes a split-type output end cap 1 and a pressure reducing valve assembly 2. The split-type output end cap 1 is detachably fitted with the pressure reducing valve assembly 2 to realize the output interface and pressure reduction control, and to activate the pressure reducing valve. The two can be fitted together by a threaded connection, and the process of triggering conduction between the two does not require a strong seal, eliminating the need for the user to forcefully tighten for high-pressure sealing of the port. The pressure reducing valve assembly 2 is used to work with the gas cylinder to achieve a stable output of high-pressure gas. An overpressure relief valve 3 and a side-outlet top-pressure type gas cylinder switch valve 4 are respectively provided on both sides of the pressure reducing valve assembly 2. The overpressure relief valve 3 is used to automatically release pressure when the pressure in the pressure reducing chamber rises abnormally; the side-outlet top-pressure type gas cylinder switch valve 4 can be used to connect detection or filling accessories. The following is a detailed description... Figure 2 The cross-sectional structural schematic diagram of a gas cylinder pressure reducing assembly according to an embodiment of the present invention is shown below for detailed description:

[0029] like Figure 2 As shown, the split-type output end cap 1 serves as the user operation interface, comprising an end cap body 11, an end cap connector 12, and an end cap valve core 13. The end cap body 11 has a hollow cylindrical structure, on which the end cap connector 12 is mounted. The two are securely connected by the end cap valve core 13. The end cap valve core 13 has a through-hole for air outlet, allowing the depressurized gas to flow along it and be output to an external gas-using device. The lower end of the end cap body 11 also has a protruding pressure-reducing structure, which activates the air outlet passage of the pressure-reducing valve assembly when the output end cap is screwed in. This pressure-reducing structure ensures that the pressure-reducing valve remains closed when the split-type output end cap 1 is not connected, enhancing transportation safety and preventing misoperation.

[0030] In a specific embodiment, the pressure reducing valve assembly 2 is used to connect to the gas cylinder. It has a compact internal structure and complete functions. Its main structure is the pressure reducing valve body 21, which forms a through-cavity structure. A piston seat 22 is installed on its upper part, and an axially movable piston 23 is provided in the piston seat 22. A first spring 24 is provided between the piston 23 and the piston seat 22 to provide elasticity for primary pressure regulation. An anti-disengagement structure (such as a corresponding annular protrusion and stroke groove) is provided at the mating point between the piston seat 22 and the inner surface of the cavity of the pressure reducing valve body 21 to prevent the first spring 24 from popping out when the split-type output end cap 1 is not installed. A valve core 25 is provided in the air outlet passage inside the piston 23. The valve core 25 passes through the bottom of the piston and extends into the valve core seat 26 below, used to control the airflow. An outlet valve core 27 and a second spring 28 are provided at the bottom of the valve core seat 26. The outlet valve core 27 remains closed under the action of the second spring 28 when not pressed by the valve core 25. When the split-type output end cap 1 is screwed onto the pressure reducing valve body 21, the piston seat 22 is pressed down. Under the force of the first spring 24, the piston 23 pushes the valve core 25 downward, pushing the outlet valve core 27, thus opening the gas flow path in the outlet channel. A filter 29 is installed below the valve core seat 26. On the one hand, it can be used to support the second spring 28, and on the other hand, it can be used to block solid particles that may be present in the gas entering the system, protecting internal components and improving the overall reliability and service life of the machine.

[0031] In a specific embodiment, a side-discharge top-pressure type gas cylinder switch valve 4 is provided on one side of the pressure reducing valve assembly 2. This switch valve 4 includes a switch valve seat 41, a switch valve core 42, a sealing gasket 43, and a third spring 44. The switch valve seat 41 has an interconnected axial opening and a radial through-hole. The valve core seat 26 passes through the radial through-hole and engages with the switch valve seat 41 to provide axial positioning, making the piston 23 more stable during axial movement. The switch valve core 42 and the third spring 44 are located within the axial opening, with the third spring 44 positioned between the switch valve core 42 and the valve core seat 26 within the axial opening. The switch valve core 42 is in a default closed state under the action of the third spring 44. If it is necessary to read the cylinder pressure or replenish gas externally, a pressure gauge with a threaded top-pressure structure or a gas filling gun can be connected, opening the gas path after the valve core is pressed. After operation, the accessories are removed, and the third spring 44 pushes the valve core to automatically reset, restoring the seal and ensuring safe use.

[0032] In a specific embodiment, to prevent the pressure reducing component from failing due to overpressure under extreme operating conditions, this application also includes an overpressure relief valve 3. The overpressure relief valve structure is equipped with a rupture disc or a spring preload. Once the internal pressure of the cavity exceeds the set limit, the rupture disc automatically ruptures or the spring valve opens, quickly releasing the excess pressure and preventing equipment damage or explosion accidents.

[0033] Figure 3A schematic diagram of a gas cylinder pressure reducing assembly assembled in a gas cylinder according to a specific embodiment of the present invention is shown, as follows. Figure 3 As shown, the pressure reducing valve assembly 2 is securely connected to the mouth of the gas cylinder 5 via a bottom thread, forming a static sealing structure to prevent gas leakage. The split-type output end cap 1 is connected to the pressure reducing valve assembly 2 via a threaded connection. The top pressure structure of the end cap triggers the pressure reducing valve assembly 2 to open the gas outlet channel, allowing the high-pressure gas in the gas cylinder 5 to be output from the split-type output end cap 1 after pressure reduction. This structure is simple for users to operate, requiring no special tools to activate the output, greatly improving the convenience for end users.

[0034] Figure 4 A schematic diagram of the application of a gas cylinder pressure reducing assembly according to a specific embodiment of the present invention is shown, such as... Figure 4 As shown, in this application, the split-type output cap 1 is connected and conductive to the pressure reducing valve assembly 2. The outlet of the split-type output cap 1 is connected to the inflation connector 7 via an external inflation pipe 6. The inflation connector 7 allows for inflation and liquid dispensing operations using a bottle-shaped liquid dispensing device. Through modular connector design, this pressure reducing assembly is compatible with multiple interface standards, improving versatility and system integration capabilities.

[0035] This invention proposes a pressure-reducing assembly for gas cylinders. By decoupling the output end from the pressure-reducing control structure, and employing a split-type output end cap and pressure-reducing valve assembly, the pressure-reducing valve is activated internally via a top-pressure structure during the screwing of the output end cap, thereby achieving safe pressure reduction and stable output of high-pressure gas. This solution not only effectively improves safety during transportation and storage, preventing accidental gas leakage, but also simplifies end-user operation and enhances the system's versatility and scalability. Furthermore, by incorporating a side-discharge top-pressure switch valve and an overpressure relief valve, the functionality and safety assurance capabilities of the entire device are significantly improved.

[0036] Obviously, those skilled in the art can make various modifications and changes to the embodiments of this utility model without departing from the spirit and scope of this utility model. In this way, this utility model is also intended to cover such modifications and changes if they fall within the scope of the claims of this utility model and their equivalents. The word "comprising" does not exclude the presence of other elements or steps not listed in the claims. The simple fact that certain measures are described in mutually different dependent claims does not indicate that a combination of these measures cannot be used for profit. Any reference numerals in the claims should not be considered as limiting the scope.

Claims

1. A pressure reduction assembly for a gas cylinder, characterized by The device includes a pressure reducing valve assembly and a split-type output end cap. The pressure reducing valve assembly is fixedly connected to the gas cylinder. The pressure reducing valve assembly has an internal air outlet channel. The split-type output end cap has a top pressure structure on its inner surface. When the split-type output end cap is installed and engaged with the pressure reducing valve assembly, the top pressure structure triggers and activates the pressure reducing valve assembly, thereby opening the air outlet channel inside the pressure reducing valve assembly.

2. Pressure reducing assembly for gas cylinders according to claim 1, characterized in that The split-type output end cap and the pressure reducing valve assembly are screwed together by a threaded structure.

3. The pressure reducing assembly for a gas cylinder according to claim 1, characterized by, The split-type output end cap includes an end cap body, an end cap valve core, and an end cap connector. The end cap body and the end cap connector are sealed and connected by the end cap valve core. The end cap valve core has an air outlet hole inside and is connected to the outlet of the end cap connector. The top pressure structure is a raised structure in the middle of the inner surface of the end cap body.

4. Pressure reducing assembly for gas cylinders according to claim 3, characterized in that It also includes an external inflation tube and an inflation connector, wherein the two ends of the external inflation tube are respectively sealed and connected to the outlet of the end cap connector and the inflation connector.

5. Pressure reducing assembly for gas cylinders according to claim 4, characterized in that The pressure reducing valve assembly includes a pressure reducing valve body, a piston seat, a piston, a valve core, and a valve core seat. The pressure reducing valve body has a cavity inside that accommodates the piston and the valve core seat. The piston seat is installed at the opening of the cavity on one side of the piston. A first spring is provided between the piston and the piston seat. The valve core is disposed in an air outlet channel inside the piston and the valve core seat. An air outlet valve structure is provided at the bottom of the air outlet channel. The pressure-replacing structure presses against the piston seat, causing the piston to move. The valve core follows the piston's movement and presses against the air outlet valve structure to open the air outlet channel.

6. Pressure reducing assembly for gas cylinders according to claim 5, characterized in that The piston seat has a through hole in the middle, and one end of the piston passes through the through hole and extends out of the surface of the piston seat, and is sealed to the air outlet through hole of the end cap valve core.

7. The pressure reducing assembly for a gas cylinder according to claim 5, characterized by, A filter is provided at the bottom of the air outlet channel, and the air outlet valve structure includes an air outlet valve core and a second spring, with the second spring disposed between the air outlet valve core and the filter.

8. The pressure reducing assembly for a gas cylinder according to claim 5, characterized by, One side of the pressure reducing valve assembly is provided with a switching valve structure, which includes a switching valve seat, a switching valve core, a sealing gasket, and a third spring. The switching valve seat is provided with an axial opening and a radial through hole that are interconnected. The valve core seat passes through the radial through hole and cooperates with the switching valve seat. The switching valve core and the third spring are disposed in the axial opening. The third spring is disposed between the switching valve core and the valve core seat in the axial opening.

9. The pressure reduction assembly for a gas cylinder according to claim 1, characterized by, One side of the pressure reducing valve assembly is also provided with an overpressure relief valve, and the overpressure relief valve is provided with a rupture disc.

10. The pressure reducing assembly for a gas cylinder according to claim 1, characterized by, The pressure reducing valve assembly is sealed to the gas cylinder opening via a threaded structure.

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