Pneumatic high pressure valve

Abstract

The application discloses a kind of pneumatic high-pressure valves, including and parallelly arranged valve body assembly and cylinder assembly;The valve body assembly includes valve body piece, valve cage piece, pneumatic valve shaft, the valve cage piece is arranged between valve body piece and cylinder assembly;And the pneumatic valve shaft is connected to cylinder assembly by passing through valve body piece and valve cage piece respectively, and is provided with gas port on the two sides of the valve body piece respectively, and one gas port is communicated to valve cage piece, and the pneumatic valve shaft is provided with the plug matched with valve cage piece.The application greatly reduces the parts required for valve by adopting valve cage design, reduces the volume of valve, reduces manufacturing cost, and uses balanced valve core to ensure reliable use in high-pressure environment, reduces instrument gas consumption and pressure.

Description

Technical Field

[0001] This invention belongs to the field of high-pressure gas filling and application technology, and specifically relates to a pneumatic high-pressure valve. Background Technology

[0002] In industrial production, various industrial pure gases, high-purity gases, and mixed gases are often used. In the production, transportation, and application of various industrial pure gases, high-purity gases, and mixed gases, it is inevitable to compress the gases in order to reduce the transportation and storage costs.

[0003] To reduce manual labor intensity and improve operational safety, automated control of high-pressure gases, including filling, transportation, use, and pressure regulation, has become an essential method for gas industry applications. Currently, existing valves require a large actuator cylinder to open and close high-pressure valves (resulting in large valve sizes), and reliable high-pressure oxygen valves are lacking. Summary of the Invention

[0004] The purpose of this invention is to provide a pneumatic high-pressure valve that significantly reduces the number of valve parts, valve size, and manufacturing costs by adopting a valve cage design. Furthermore, the use of a balanced valve core ensures reliable operation in high-pressure environments while reducing the use and pressure of instrument air.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] A pneumatic high-pressure valve includes a valve body assembly and a cylinder assembly arranged in parallel. The valve body assembly includes a valve body component, a valve cage component, and a pneumatic valve shaft. The valve cage component is disposed between the valve body component and the cylinder assembly. The pneumatic valve shaft passes through the valve body component and the valve cage component respectively and is connected to the cylinder assembly. Air ports are provided on both sides of the valve body component, and one of the air ports is connected to the valve cage component. A plug adapted to the valve cage component is provided on the pneumatic valve shaft.

[0007] Furthermore, the cylinder assembly includes a cylinder body, a cylinder base, and a cylinder top cover, and a cylinder piston is disposed inside the cylinder body.

[0008] Furthermore, both the cylinder base and the cylinder cover are provided with air inlets, and the cylinder base and the cylinder piston, the cylinder cover and the cylinder piston support are all formed with sealed chambers, and the air inlets in the cylinder base and the cylinder cover are respectively connected to the sealed chambers.

[0009] Furthermore, a bushing is provided between the cylinder base and the valve cage.

[0010] Furthermore, a screw component is connected inside the cylinder piston, and one end of the screw component is connected to the tail end of the pneumatic valve shaft.

[0011] Furthermore, sealing O-rings are provided at the contact points between the cylinder base, cylinder top cover, cylinder piston, and cylinder body.

[0012] Furthermore, spring seats are provided on the inner sides of both the cylinder base and the cylinder cover, and a return spring is provided between the cylinder base and the cylinder piston or between the cylinder cover and the cylinder piston.

[0013] Furthermore, an air cavity is formed inside the valve cage, and the air cavity has an axial port and a longitudinal port respectively in the axial direction and longitudinal direction of the pneumatic valve, and is connected to one of the air ports on the valve body, and the axial port in the axial direction is adapted to the plug on the shaft of the pneumatic valve.

[0014] Furthermore, a limit ring is also provided on the pneumatic valve shaft.

[0015] Furthermore, the diameter of the limiting ring is larger than the through hole at the bottom of the valve cage.

[0016] Compared with the prior art, the advantages of the present invention are as follows: First, it adopts a parallel valve core design structure in which the cylinder assembly and valve body assembly are parallel, which can effectively reduce the cylinder diameter of the drive cylinder, reduce manufacturing costs, and is more suitable for filling high-pressure pure oxygen.

[0017] Secondly, the present invention adopts the valve cage component to effectively reduce the complexity of the internal structure, and also realizes a foolproof installation and connection design. The air ports on both sides of the valve body component can be used as air inlets or outlets, thereby reducing the need for safety positions, and connecting to the air inlet or outlet pipeline. The corresponding cylinder assembly controls the movement of the pneumatic valve shaft in the valve cage component by air inlet or outlet at different positions, and uses plugs for opening and closing.

[0018] Furthermore, the cylinder assembly of the present invention has a mirror-shaped structure at both ends of the cylinder piston. Spring seats are provided on the inner sides of both the cylinder base and the cylinder cover, which can also achieve forward and reverse installation. The switching between normally open valve and normally closed valve is achieved by springs installed in different positions. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of the pneumatic high-pressure valve provided by the present invention.

[0021] Figure 2 yes Figure 1 A sectional view.

[0022] Reference numerals in the attached drawings: 1-valve body assembly, 2-cylinder assembly, 3-pneumatic valve shaft, 4-plug, 5-valve cage, 6-air port, 7-shaft sleeve, 8-axial port, 9-longitudinal port, 10-inflation port, 11-cylinder base, 12-cylinder body, 13-cylinder piston, 14-cylinder top cover, 15-reset spring, 16-screw, 17-sealing O-ring, 18-sealing chamber. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0025] In the description of this invention, it should be noted that if terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this invention is usually placed, they are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0026] Furthermore, the terms "first," "second," and "third" are used only for distinguishing descriptions and should not be interpreted as indicating or implying relative importance.

[0027] Furthermore, the use of terms such as "horizontal," "vertical," and "suspended" does not imply that the component must be absolutely horizontal or suspended, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0028] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0029] It should be noted that, where there is no conflict, the features in the embodiments of the present invention can be combined with each other.

[0030] like Figures 1-2 As shown, a pneumatic high-pressure valve includes a valve body assembly 1 and a cylinder assembly 2 arranged in parallel. The valve body assembly 1 includes a valve body component, a valve cage component 5, and a pneumatic valve shaft 3. The valve cage component 5 is disposed between the valve body component and the cylinder assembly 2. The pneumatic valve shaft 3 passes through the valve body component and the valve cage component 5 respectively and is connected to the cylinder assembly 2. Air ports 6 are provided on both sides of the valve body component, and one of the air ports 6 is connected to the valve cage component 5. A plug 4 adapted to the valve cage component 5 is provided on the pneumatic valve shaft 3.

[0031] Compared to existing technologies, in conventional high-pressure oxygen filling, the oxygen filling pressure is generally 30 MPa or higher. Higher pressures require larger cylinder diameters for the drive cylinder, and the connection structure between the drive cylinder and the valve is complex, costly, and requires more instrument air (filled into the drive cylinder). In this invention, the cylinder assembly 2 and valve assembly are designed in parallel, with opening and closing achieved through the movement of the pneumatic valve shaft 3 connected between them. This direct pull-and-retract method effectively reduces the piston's force-bearing area within the drive cylinder, thus reducing the cylinder diameter. Furthermore, this invention achieves a user-friendly installation design. The valve assembly's air port 6 can be installed in either direction, as can the piston and spring, resulting in greater system compatibility.

[0032] The cylinder assembly 2 includes a cylinder body 12, a cylinder base 11, and a cylinder cover 14. A cylinder piston 13 is disposed inside the cylinder body 12. Both the cylinder base 11 and the cylinder cover 14 have air inlets 10. Sealed chambers are formed between the cylinder base 11 and the cylinder piston 13, and between the cylinder cover 14 and the piston 13 support. The air inlets 10 in the cylinder base 11 and the cylinder cover 14 are respectively connected to the sealed chambers. Through the air inlets 10 at different positions, the cylinder piston 13 can move to different positions while being filled with instrument air, compressing or stretching the spring, thus pushing the plug 4 on the pneumatic valve shaft 3 away from or towards the axial air inlet or outlet of the valve cage 5, thereby achieving the opening and closing functions.

[0033] A bushing 7 is provided between the cylinder base 11 and the valve cage 5.

[0034] A screw rod 16 is connected inside the cylinder piston 13, and one end of the screw rod 16 is connected to the tail end of the pneumatic valve shaft 3. Sealing O-rings 17 are provided at the contact points between the cylinder base 11, the cylinder cover 14, and the cylinder piston 13 and the cylinder body 12.

[0035] Spring seats are provided on the inner sides of both the cylinder base 11 and the cylinder cover 14, and a return spring 15 is provided between the cylinder base 11 and the cylinder piston 13 or between the cylinder cover 14 and the cylinder piston 13.

[0036] An air chamber is formed within the valve cage 5, and the air chamber has an axial port 8 and a longitudinal port 9 in the direction of the pneumatic valve shaft 3 and longitudinal direction, respectively, and each port 9 is connected to one of the air ports 6 on the valve body. The axial port 8 is adapted to the plug 4 on the pneumatic valve shaft 3. Both the axial port 8 and the longitudinal port 9 can serve as air inlets and outlets, and the connection positions of the air inlets and outlets can be interchanged to enhance the compatibility of the overall system.

[0037] A limit ring is also provided on the pneumatic valve shaft 3. The diameter of the limit ring is larger than the through hole at the bottom of the valve cage 5.

[0038] In practical use, the connection status during pre-installation can be divided into different states according to the present invention:

[0039] Implementation Method 1:

[0040] If the valve cage 5 is selected as the air inlet in the axial direction, then the valve cage 5 will be the air outlet in the longitudinal direction, thus selecting the valve bottom air inlet mode. A spring is selected and placed between the cylinder upper cover 14 and the cylinder piston 13. The valve can also be selected to be normally closed or normally open initially.

[0041] The first thing to determine is the maximum gas lift force F1 caused by the gas pressure difference due to the intake below the selector valve. The specific calculation is as follows:

[0042] F1=(P1-P2)*((D2 / 2)^2-(D1 / 2)^2)*π (Equation 1)

[0043] Wherein, P1 is the ultimate working pressure of the inlet valve, P2 is the ultimate working pressure of the outlet valve, D1 is the maximum diameter of the pneumatic valve shaft 3, and D2 is the maximum diameter of the sealing surface.

[0044] In the normally open state, the valve is initially open and the plug 4 is away from the valve cage 5. After the high-pressure inflation is completed, the plug 4 needs to be pushed against the air inlet of the valve cage 5.

[0045] After inflation, plug 4 needs to be pushed to the air inlet of valve cage 5 to form a seal. At this point, the main function of the spring is to reopen the valve after the air is released from the cylinder. The minimum spring force Fk required by the selected spring is calculated, and this minimum spring force Fk is determined based on the spring constant K and compression length Lx of the selected spring.

[0046] Of course, to ensure a proper seal, a minimum preload pressure P4 is required. Therefore, the minimum preload force required is:

[0047] F2=P4*((D2 / 2)^2-(D1 / 2)^2)*π (Equation 2)

[0048] When sealing plug 4, instrument air enters through the air inlet 10 on the cylinder cover 14, pushing the piston towards the cylinder base 11. When plug 4 abuts against the air inlet of valve cage 5, the spring is in a stretched state. At this time, the thrust F3 required by the entire cylinder is clearly determined by the following formula.

[0049] F3 = F1 + F2 + F4 + K*(Lx + L) (Equation 3)

[0050] Where L is the maximum stroke of the valve stem, and F4 is the frictional force between the cylinder and the valve stem. Therefore, the minimum instrument air pressure P3 required by the cylinder can be calculated:

[0051] P3=F3 / ((D3 / 2)^2*π)(Equation 4)

[0052] The resulting P3 value is far less than the minimum instrument air pressure required by traditional technology.

[0053] Conversely, in the normally closed state, the plug 4 on the pneumatic valve shaft 3 initially abuts against the air inlet of the valve cage 5. Upon entering the working state, air is introduced into the air inlet 10 towards the cylinder base 11, filling the sealed space between the cylinder base 11 and the cylinder piston 13. This compressed spring, pushing the cylinder piston 13, causes the plug 4 to move away from the air inlet of the valve cage 5, allowing the air inlet and outlet to connect. At this time, the reset is primarily achieved through the spring force generated by spring compression. Therefore, the maximum gas lifting force F1, the minimum preload force F2, and the frictional force F4 between the cylinder and valve stem remain unchanged. The reset force Fk provided by the spring must satisfy: Fk = F1 + F2 + F4, thus allowing the selection of a suitable spring.

[0054] Implementation Method Two:

[0055] If the valve cage 5 is selected as the air outlet in the axial direction, then the valve cage 5 is selected as the air inlet in the longitudinal direction, which is the air inlet mode of the selected valve. A spring is selected and set between the cylinder cover 14 and the cylinder piston 13. It is also possible to select that the valve is initially in a normally closed or normally open state.

[0056] Unlike the bottom air intake, the air inlet and outlet of the valve cage 5 are interchanged. The top air intake mode is in the normally closed state. When the pressure on the top of the valve is greater than the pressure on the bottom of the valve, the thrust provided by the cylinder needs to overcome the spring force and the clamping force formed by the pressure difference after the air pressure change, so that the pneumatic valve shaft 3 is pulled up to ensure the opening of the valve. The specific calculation principle is the same as above, and will not be repeated here.

[0057] Similarly, when air is introduced into the valve, if the normally open state is selected, the clamping force formed by the air pressure difference remains unchanged. The selection of the spring can be completed if the minimum spring force of the selected spring can overcome the friction force F4 between the cylinder and the valve stem and the clamping force formed by the air pressure difference.

[0058] Furthermore, under the condition that the cylinder gauge air pressure required for air intake on the valve is 35 MPa, the driving air pressure calculated using the mode provided by this invention is less than 0.6 MPa, which is far less than the pressure required by traditional cylinders.

[0059] In summary, the present invention is flexible and adaptable, allowing for the repositioning of the pipe connection, which makes subsequent installation more convenient, reduces maintenance costs, and shortens the maintenance cycle.

[0060] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A pneumatic high pressure valve, characterized by: It includes a valve body assembly (1) and a cylinder assembly (2) arranged side by side; the valve body assembly (1) includes a valve body component, a valve cage component (5), and a pneumatic valve shaft (3), the valve cage component (5) is disposed between the valve body component and the cylinder assembly (2); and the pneumatic valve shaft (3) passes through the valve body component and the valve cage component (5) respectively and is connected to the cylinder assembly (2), and air ports (6) are respectively provided on both sides of the valve body component, and one of the air ports (6) is connected to the valve cage component (5), and a plug (4) adapted to the valve cage component (5) is provided on the pneumatic valve shaft (3); The cylinder assembly (2) includes a cylinder body (12), a cylinder base (11) and a cylinder cover (14), and a cylinder piston (13) is provided inside the cylinder body (12); Both the cylinder base (11) and the cylinder cover (14) are provided with air inlets (10), and the cylinder base (11) and the cylinder piston (13), the cylinder cover (14) and the cylinder piston (13) support are all formed with sealed chambers, and the air inlets (10) in the cylinder base (11) and the cylinder cover (14) are respectively connected to the sealed chambers (18); Spring seats are provided on the inner sides of the cylinder base (11) and the cylinder cover (14), and a return spring (15) is provided between the cylinder base (11) and the cylinder piston (13) or between the cylinder cover (14) and the cylinder piston (13). An air chamber is formed inside the valve cage (5), and the air chamber is provided with an axial port (8) and a longitudinal port (9) in the direction of the pneumatic valve shaft (3) and in the longitudinal direction, respectively, and is connected to one of the air ports (6) on the valve body. The axial port (8) in the axial direction is adapted to the plug (4) on the pneumatic valve shaft (3). Both the axial port (8) and the longitudinal port (9) can be used as the air inlet and the air outlet.

2. The pneumatic high pressure valve according to claim 1, characterized in that: A bushing (7) is provided between the cylinder base (11) and the valve cage (5).

3. The pneumatic high pressure valve according to claim 1, characterized in that: The cylinder piston (13) is connected to a screw (16), one end of which is connected to the tail end of the pneumatic valve shaft (3).

4. The pneumatic high pressure valve according to claim 1, characterized in that: O-rings (17) are provided at the contact points between the cylinder base (11), cylinder cover (14), cylinder piston (13) and cylinder body (12).

5. The pneumatic high pressure valve according to claim 1, characterized in that: A limit ring is also provided on the pneumatic valve shaft (3).

6. The pneumatic high pressure valve according to claim 5, characterized in that: The diameter of the limiting ring is larger than the through hole at the bottom of the valve cage (5).

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