Integrated pressure reducing and constant flow control valve suitable for small high-pressure gas cylinders

Abstract

This utility model discloses an integrated pressure-reducing constant flow control valve suitable for small high-pressure gas cylinders, including a valve body, a switch handle assembly, a filling connector assembly, a valve cover, a valve core, a pressure-stabilizing spring, and a gas-relieving pin. The valve body has an upper airflow channel and a lower airflow channel inside. The switch handle assembly controls the opening and closing of the upper and lower airflow channels. The filling connector assembly is used for gas filling. The valve cover is connected to the upper part of the valve body, and the valve core cooperates with the valve body and valve cover to achieve a seal, used in conjunction with the pressure-stabilizing spring to adjust the opening to complete the pressure reduction of high-pressure gas. The gas-relieving pin is assembled at the outlet end of the valve cover to achieve constant flow output. This invention reduces sealing nodes through structural integration, improving safety; its compact design adapts to small spaces, reducing assembly difficulty; dual filtration and channel optimization extend component life and reduce maintenance costs; it is suitable for small high-pressure gas cylinders and mobile gas supply equipment.

Description

Technical Field

[0001] This utility model relates to the field of gas flow control technology, and in particular to an integrated pressure reducing constant flow control valve suitable for small high-pressure gas cylinders. Background Technology

[0002] Currently, for fluid control of small high-pressure gas cylinders and mobile gas supply equipment, the industry generally adopts a split structure design combining a cylinder valve and an independent constant flow valve. The cylinder valve, as the core component for gas source on / off, is responsible for controlling the release and shut-off of high-pressure gas within the cylinder. The independent constant flow valve performs a dual function: on the one hand, it reduces the pressure of the high-pressure gas in the cylinder to a suitable working pressure; on the other hand, it ensures the stability of the gas output flow rate through a built-in constant flow mechanism to match the operating conditions of downstream equipment.

[0003] However, this split design has the following shortcomings in practical applications: First, it poses significant sealing safety hazards. Because the cylinder valve and the independent constant flow valve require assembly via multiple sets of threaded connections, the number of sealing nodes increases. Under the long-term effects of high-pressure gas and vibration conditions of mobile equipment, the sealing performance of the threaded connections is prone to gradual failure, posing a safety hazard. Second, it suffers from poor space adaptability and assembly efficiency. The split components require individual assembly, occupying a large installation space and making it difficult to adapt to the confined layout of small gas cylinders and mobile gas supply equipment. It also places high demands on the assembly skills of operators. Third, it results in high maintenance costs and a short service life. Because the components are independent and dispersed, when the equipment malfunctions, each component must be disassembled for troubleshooting, making fault location difficult and maintenance inefficient. Furthermore, the frequent stress and wear on multiple sealing nodes shortens the replacement cycle of the seals, increasing maintenance consumable costs and reducing the overall service life of the equipment.

[0004] With the increasingly widespread application of small high-pressure gas cylinders in medical emergency care, outdoor welding, and emergency gas supply, the market has placed higher demands on the safety, compactness, and economical maintenance of equipment. Existing split-type pressure-reducing constant-current control structures can no longer meet the actual needs of these scenarios. Therefore, there is an urgent need to design a pressure-reducing constant-current control device with a high degree of integration, strong sealing reliability, excellent adaptability, and low maintenance cost. Summary of the Invention

[0005] To solve the above-mentioned technical problems, this utility model provides an integrated pressure reducing constant flow control valve suitable for small high-pressure gas cylinders. Through functional integration, structural optimization and precise flow control design, it realizes a safe, stable and efficient supply of high-pressure gas.

[0006] The technical solution adopted by this utility model to solve its technical problem is: an integrated pressure reducing constant flow control valve suitable for small high-pressure gas cylinders, including a valve body, a switch handle component, an inflation connector component, a valve cover, a valve core, a pressure stabilizing spring, and a gas easing nail; The valve body has an upper airflow channel and a lower airflow channel along its central axis. The upper and lower airflow channels are coaxial, and an airflow branch is formed at the end of the upper and lower airflow channels that are close to each other. The switch handle is threaded to the side wall of the valve body and is connected to the two airflow branches to control the opening and closing of the upper and lower airflow channels. The inflation connector is threaded to the side wall of the valve body to realize gas filling. The valve cover is connected to the upper part of the valve body. The valve cover has an internal cavity and an outlet for connecting to external equipment. The valve core is assembled in the cavity of the valve cover and cooperates with the valve body and valve cover to achieve a seal. It is used to adjust the opening degree with the pressure-stabilizing spring to complete the pressure reduction of high-pressure gas. The pressure-stabilizing spring is assembled in the cavity of the valve cover and sleeved on the outside of the valve core. The two ends of the pressure-stabilizing spring abut against the valve core and the valve body respectively. It is used to provide a stable preload to control the valve core opening degree and ensure that the gas pressure is constant after pressure reduction. The air-damping nail is installed at the air outlet end of the valve cover. The air-damping nail has a tapered structure and a flat groove on its side. Constant flow output is achieved through the fit gap between the flat groove and the air outlet channel of the valve cover.

[0007] Furthermore, the inner diameter of the upper airflow channel is smaller than the inner diameter of the lower airflow channel.

[0008] Furthermore, it also includes a filter plug. The bottom of the valve body has an installation groove that communicates with the lower airflow channel. The filter plug is interference-fitted into the installation groove. The filter plug has a filtration accuracy of μm and is used to filter impurities in the gas inside a small high-pressure gas cylinder.

[0009] Furthermore, the air-damping nail is made of brass, the taper of the air-damping nail is 4°-6°, and the angle between the bottom surface of the flat groove and the generatrix of the tapered air-damping nail is 1.5°-2.5°.

[0010] Furthermore, the inflation connector component is threadedly connected to the outer wall of the valve body, including a connector housing and a valve stem, connector spring, pressure ring, elastic retaining ring, and filter disc disposed within the connector housing. One end of the connector housing is threadedly connected to the outer wall of the valve body, and the inner cavity of the connector housing communicates with the lower airflow channel. The elastic retaining ring is installed on a stepped groove near the valve body end within the connector housing. The filter disc is located on the side of the elastic retaining ring away from the elastic retaining ring. The valve stem is movably inserted through the connector housing, and an air inlet channel is provided within the valve stem. The air outlet of the air inlet channel is located on the outer wall of the valve stem near the valve body end. The pressure ring is sleeved outside the air outlet of the air inlet channel of the valve stem and is fixedly connected to the inner wall of the connector housing. The connector spring is located between the valve stem and the filter disc, and both ends of the connector spring abut against the valve stem and the filter disc, respectively.

[0011] Furthermore, the outer side of the valve core is sealed to the inner wall of the valve cover by a fluororubber O-ring, and the inner side is sealed to the inner wall of the valve body by a nitrile rubber O-ring.

[0012] The beneficial effects of this utility model are: This utility model integrates four core functions—valve on / off, dual filtration, pressure reduction and stabilization, and constant flow control—into a single valve body structure through an integrated design. This significantly reduces the number of connection points and sealing parts found in split structures. Combined with the double O-ring seal design of the valve core component, it fundamentally reduces the risk of leakage under high pressure and vibration conditions, significantly improving operational safety. Furthermore, the compact integrated structure eliminates the need for additional independent components, perfectly adapting to the limited installation space of small high-pressure gas cylinders and mobile gas supply equipment, reducing assembly difficulty and operational requirements. Through structural parameter design and material selection, the device ensures stable operation under long-term high pressure and vibration conditions, effectively reducing maintenance costs and meeting the stringent gas control requirements of scenarios such as medical oxygen supply and welding protection. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0014] Figure 2 This is a schematic diagram of the structure of the gas-operated nail in this utility model.

[0015] Figure 3 This is a bottom view of the air-retaining nail in this utility model.

[0016] Figure 4 This is a structural schematic diagram of the air inflator component in this utility model.

[0017] In the diagram: 1. Valve body; 11. Upper airflow channel; 12. Lower airflow channel; 13. Airflow branch; 14. Filter plug; 2. Switch handle assembly; 3. Inflation connector assembly; 31. Connector housing; 32. Valve stem; 33. Connector spring; 34. Pressure ring; 35. Elastic retaining ring; 36. Filter disc; 4. Valve cover; 5. Valve core; 51. Fluororubber O-ring; 52. Nitrile rubber O-ring; 6. Pressure stabilizing spring; 7. Air venting pin; 71. Flat groove. Detailed Implementation

[0018] The present invention will be further described in detail below with reference to the accompanying drawings.

[0019] This utility model discloses an integrated pressure reducing constant flow control valve suitable for small high-pressure gas cylinders.

[0020] Reference Figure 1-4 An integrated pressure reducing constant flow control valve suitable for small high-pressure gas cylinders includes a valve body 1, a switch handle component 2, an inflation connector component 3, a valve cover 4, a valve core 5, a pressure stabilizing spring 6, an air-relieving nail 7, and a filter plug 14. The valve body 1 has an upper airflow channel 11 and a lower airflow channel 12 along its central axis. The upper airflow channel 11 and the lower airflow channel 12 are coaxial. An airflow branch 13 is opened at the end of the upper airflow channel 11 and the lower airflow channel 12 that are close to each other. The switch handle component 2 is threaded to the side wall of the valve body 1 and is connected to the two airflow branches 13. Its built-in valve stem 32 is precisely adapted to the two airflow branches 13. The opening and closing of the upper airflow channel 11 and the lower airflow channel 12 can be achieved by rotating: when rotated clockwise, the valve stem 32 moves axially and blocks the airflow branch 13, cutting off the gas flow path; when rotated counterclockwise, the valve stem 32 is released from the blocking state, and the airflow branch 13 is opened, thereby controlling the opening and closing between the upper airflow channel 11 and the lower airflow channel 12.

[0021] The lower airflow channel 12 has a larger inner diameter than the upper airflow channel 11. The lower airflow channel 12, serving as the inlet for high-pressure gas, directly connects to a small high-pressure gas cylinder, with an initial pressure of 10-30 MPa. Its larger inner diameter reduces the gas flow velocity, preventing direct impact of the high-pressure gas flow on the valve core 5, allowing the gas to enter the airflow branch 13 in a relatively stable state, providing a stable initial operating condition for subsequent pressure reduction. The upper airflow channel 11 connects to the pressure-reducing assembly inside the valve cover 4. Its relatively smaller inner diameter allows for a moderate increase in flow velocity when gas enters the pressure-reducing stage, making the valve core 5 more sensitive to changes in gas pressure. Combined with the preload adjustment of the pressure-stabilizing spring 6, this enables more precise control of the valve core 5's opening.

[0022] The valve cover 4 is connected to the upper part of the valve body 1, and a cavity is formed inside the valve cover 4. The top of the valve cover 4 has an outlet end for connecting to the interface of external equipment. The valve core 5 and the pressure regulating spring 6 are both assembled in the cavity of the valve cover 4. The valve core 5 is made of HPb59-1 brass, and the bottom is treated with PTFE to improve sealing compatibility. The valve core 5 cooperates with the valve body 1 and the valve cover 4 to achieve sealing. The outer side of the valve core 5 is sealed to the inner wall of the valve cover 4 by a fluororubber O-ring 51, and the inner side is sealed to the inner wall of the valve body 1 by a nitrile rubber O-ring 52. The fluororubber O-ring 51 has excellent high pressure resistance and corrosion resistance, and is suitable for high pressure gas contact scenarios. The nitrile rubber O-ring 52 has good elastic recovery and sealing tightness. The two work together to achieve no gas leakage during pressure reduction and fully ensure safe use.

[0023] The core function of valve core 5 is to work with pressure-stabilizing spring 6 to adjust the opening degree to reduce high-pressure gas pressure. The change in its opening degree directly determines the gas flow cross-sectional area, thereby controlling the pressure reduction amplitude. Pressure-stabilizing spring 6 is made of 60Si2Mn spring steel and is assembled inside the cavity of valve cover 4, sleeved on the outside of valve core 5. Both ends of pressure-stabilizing spring 6 abut against valve core 5 and valve body 1 respectively, providing a stable preload to control the opening degree of valve core 5 and ensure constant gas pressure after pressure reduction.

[0024] The gas-relieving pin 7 is interference-fitted onto the outlet end of the valve cover 4. Made of brass, the gas-relieving pin 7 has a tapered structure with a taper controlled between 4° and 6°; in this embodiment, the taper is 5.15°. The smaller end of the gas-relieving pin 7 faces the valve core 5. A flat groove 71 is formed on the side of the gas-relieving pin 7. Constant flow output is achieved through the fit between the flat groove 71 and the outlet channel of the valve cover 4. The angle between the bottom surface of the flat groove 71 and the generatrix of the tapered shape of the gas-relieving pin 7 is 1.5°-2.5°; in this embodiment, the angle is 1.94°. Its flow control principle is based on the flow stability of gas passing through a fixed gap. When the depressurized gas flows through the gap formed by the gas-relieving pin 7 and the outlet channel of the valve cover 4, the airflow velocity and flow rate are precisely limited. Combined with the fixed gap size, constant flow output of the gas is achieved.

[0025] The bottom of the valve body 1 is provided with an installation groove that communicates with the lower airflow channel 12. The filter plug 14 is interference-fitted into the installation groove. The filter plug 14 has a filtration accuracy of 20μm, which can pre-filter the high-pressure gas flowing out of the small high-pressure gas cylinder, effectively intercept impurities ≥20μm in the gas, and prevent impurities from entering the upper airflow channel 11 and wearing the valve core 5.

[0026] The inflation connector component 3 adopts a one-way valve structure to realize gas filling and prevent gas backflow. The inflation connector component 3 includes a connector housing 31 and a valve stem 32, a connector spring 33, a pressure ring 34, an elastic retaining ring 35, and a filter 36 disposed within the connector housing 31. The connector housing 31 is made of HPb59-1 brass. One end is threaded and fixed to the inflation port on the outer wall of the valve body 1. The inner cavity of the connector housing 31 is connected to the lower airflow channel 12 inside the valve body 1, forming an inflation passage. A stepped groove is machined on the inner wall of the connector housing 31 near the valve body 1. An elastic retaining ring 35 is installed in the groove to position a 316L stainless steel filter 36. The filter 36 is located on the side of the elastic retaining ring 35 away from the valve body 1. The filter 36 has a filtration accuracy of 20μm and can efficiently filter solid impurities such as metal fragments and dust carried by the external high-pressure gas during the filling process. The valve stem 32 is made of 316L stainless steel and is axially inserted into the connector housing 31. An air inlet channel is opened inside the valve stem 32 along the axis. The air outlet of the air inlet channel is located near the valve stem 32. The outer wall near the valve body 1 ensures that gas can enter the lower airflow channel 12 from the air inlet channel through the air outlet. The pressure ring 34 is made of brass and is fitted on the outside of the air outlet of the valve stem 32. The outer wall is press-fitted with the inner wall of the connector housing 31 to achieve fixation. The connector spring 33 is located between the valve stem 32 and the filter 36. Its two ends are rigidly abutted against the annular step of the valve stem 32 and the filter 36, respectively. When inflating, the pressure at the external inflation end pushes open the valve stem 32 and compresses the connector spring 33, so that the valve stem 32 moves axially closer to the filter 36. The external gas is filled through the inlet of the connector housing 31, the air inlet channel of the valve stem 32, the air outlet, the lower airflow channel 12 and the filter plug 14. After inflation is completed, the external pressure is released, the connector spring 33 returns to its original position and pushes the valve stem 32 to fit against the filter 36 to block the air inlet channel, thereby achieving one-way automatic sealing.

[0027] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. An integrated pressure-reducing constant flow control valve suitable for small high-pressure gas cylinders, characterized in that: It includes a valve body (1), a switch handle assembly (2), an air inlet assembly (3), a valve cover (4), a valve core (5), a pressure stabilizing spring (6), and an air release pin (7); The valve body (1) has an upper airflow channel (11) and a lower airflow channel (12) along its central axis. The upper airflow channel (11) and the lower airflow channel (12) are coaxial. An airflow branch (13) is opened at the end of the upper airflow channel (11) and the lower airflow channel (12) that are close to each other. The switch handle component (2) is threaded to the side wall of the valve body (1) and is connected to the two airflow branches (13) to control the opening and closing between the upper airflow channel (11) and the lower airflow channel (12). The gas filling connector component (3) is threaded to the side wall of the valve body (1) to realize gas filling. The valve cover (4) is connected to the upper part of the valve body (1). The valve cover (4) has a cavity inside and an outlet for connecting to external equipment is provided on the top of the valve cover (4). The valve core (5) is assembled in the cavity of the valve cover (4) and cooperates with the valve body (1) and the valve cover (4) to achieve a seal. It is used to cooperate with the pressure stabilizing spring (6) to adjust the opening to complete the pressure reduction of high pressure gas. The pressure stabilizing spring (6) is assembled in the cavity of the valve cover (4) and sleeved on the outside of the valve core (5). The two ends of the pressure stabilizing spring (6) abut against the valve core (5) and the valve body (1) respectively. It is used to provide a stable preload to control the opening of the valve core (5) and ensure that the gas pressure is constant after pressure reduction. The slow-release nail (7) is assembled at the outlet end of the valve cover (4). The slow-release nail (7) has a tapered structure and a flat groove (71) is opened on the side. Constant flow output is achieved through the fit gap between the flat groove (71) and the outlet channel of the valve cover (4).

2. The integrated pressure-reducing constant flow control valve for small high-pressure gas cylinders according to claim 1, characterized in that: The inner diameter of the upper airflow channel (11) is smaller than the inner diameter of the lower airflow channel (12).

3. The integrated pressure-reducing constant flow control valve for small high-pressure gas cylinders according to claim 1, characterized in that: It also includes a filter plug (14). The bottom of the valve body (1) is provided with an installation groove that communicates with the lower airflow channel (12). The filter plug (14) is interference-fitted into the installation groove. The filter plug (14) has a filtration accuracy of 20μm and is used to filter impurities in the gas in a small high-pressure gas cylinder.

4. The integrated pressure-reducing constant flow control valve for small high-pressure gas cylinders according to claim 1, characterized in that: The air-relief nail (7) is made of brass, and the taper of the air-relief nail (7) is 4°-6°. The angle between the bottom surface of the flat groove (71) and the tapered generatrix of the air-relief nail (7) is 1.5°-2.5°.

5. An integrated pressure-reducing constant flow control valve suitable for small high-pressure gas cylinders according to any one of claims 1-4, characterized in that: The inflation connector component (3) is threaded to the outer wall of the valve body (1), including a connector housing (31) and a valve stem (32), connector spring (33), pressure ring (34), elastic retaining ring (35), and filter (36) disposed within the connector housing (31). One end of the connector housing (31) is threaded to the outer wall of the valve body (1), and the inner cavity of the connector housing (31) communicates with the lower airflow channel (12). The elastic retaining ring (35) is installed on the stepped groove near the valve body (1) inside the connector housing (31), and the filter (36) is located on the elastic retaining ring (35). On the side away from the elastic retaining ring (35), the valve stem (32) is movably inserted into the connector housing (31). The valve stem (32) has an air inlet channel. The air outlet of the air inlet channel is located on the outer side wall of the valve stem (32) near the valve body (1). The pressure ring (34) is sleeved outside the air outlet of the air inlet channel of the valve stem (32). The pressure ring (34) is fixedly connected to the inner wall of the connector housing (31). The connector spring (33) is located between the valve stem (32) and the filter (36). The two ends of the connector spring (33) abut against the valve stem (32) and the filter (36) respectively.

6. An integrated pressure-reducing constant flow control valve suitable for small high-pressure gas cylinders according to claim 5, characterized in that: The outer side of the valve core (5) is sealed to the inner wall of the valve cover (4) by a fluororubber O-ring (51), and the inner side is sealed to the inner wall of the valve body (1) by a nitrile rubber O-ring (52).

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