High-pressure pneumatic control coaxial valve of outer flow channel structure

Abstract

The utility model relates to a high-pressure pneumatic control coaxial valve with an outer flow channel structure, when the air pressure in a first air chamber and the air pressure in a second air chamber are different, a control piston can be pushed to one side with lower air pressure so as to drive a whole valve core to slide, and at the moment, an execution piston can slide along with the valve core; the executing piston slides to abut against or be far away from the first sealing component, so that the valve is switched to be in a closed state or an open state, and pneumatic control of the pneumatic valve is achieved. Certainly, the flow can be controlled by controlling the distance between the execution piston and the first sealing component. The control piston is arranged in the control cavity, so that the control piston is only influenced by the pressure of air in the first air chamber and the second air chamber and is not influenced by the pressure of fluid in the outer flow channel, and the valve can be stably controlled even under the condition that the pressure of the fluid in the outer flow channel is high.

Description

Technical Field

[0001] This utility model relates to the field of pneumatically controlled coaxial valve technology, and in particular to a high-pressure pneumatically controlled coaxial valve with an external flow channel structure. Background Technology

[0002] With the continuous development of automated production technology, valves used to control fluid flow are also constantly being improved to adapt to automated control. Among them, coaxial valves adopt an integrated structure of valve body and actuator: the actuator coincides with the axis of the fluid pipeline (fluid flow direction). This maximizes installation space savings and minimizes the impact of fluid pressure difference on valve opening pressure. Pneumatic actuators use compressed air as an energy source and are characterized by simple structure, reliable and stable operation, large output thrust, convenient maintenance, fire and explosion protection, and low cost. Therefore, the pneumatically controlled coaxial valve, resulting from the combination of these two technologies, is widely used in industrial production.

[0003] As a novel design, the external flow channel pneumatic coaxial valve reduces internal turbulence and vibration compared to traditional pneumatic coaxial valves, and can also be manufactured in a smaller size. However, in existing external flow channel pneumatic coaxial valves, the piston is affected by the fluid pressure inside the external flow channel when the internal pressure is high, making it difficult for the pneumatic system to accurately control the piston's movement. Utility Model Content

[0004] In view of the current state of the prior art, the technical problem to be solved by this utility model is to provide a high-pressure pneumatically controlled coaxial valve with an external flow channel structure, so as to avoid the pressure of the fluid in the external flow channel affecting the movement of the piston, thereby enabling the pneumatic system to accurately control the movement of the piston.

[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: a high-pressure pneumatically controlled coaxial valve with an external flow channel structure, comprising an outer shell and an inner shell, wherein a fixing seat is provided on the inner shell and fixedly connected to the outer shell, and an external flow channel for fluid circulation is formed between the inner surface of the outer shell and the outer surface of the inner shell.

[0006] One end of the inner shell is closed, and the other end is provided with a partition. A control cavity is formed between the closed end of the inner shell and the partition.

[0007] A valve core is slidably connected to the partition plate. One end of the valve core is equipped with a control piston. The control piston is located in the control chamber and divides the control chamber into a first air chamber and a second air chamber that are not interconnected. The fixed base has a first air hole and a second air hole for connecting a control air source. The first air hole communicates with the first air chamber, and the second air hole communicates with the second air chamber.

[0008] The other end of the valve core is provided with an actuating piston. The outer shell is provided with an annular valve seat corresponding to the actuating piston. A first sealing component is connected to the valve seat. When the air pressure in the second air chamber is greater than the air pressure in the first air chamber, the actuating piston slides against the first sealing component, so that the valve is in the closed state. When the air pressure in the first air chamber is greater than the air pressure in the second air chamber, the actuating piston slides away from the first sealing component, so that the valve is in the open state.

[0009] Furthermore, the valve core is provided with a connecting rod, which connects the control piston and the actuating piston. The connecting rod passes through the partition and is slidably connected to it.

[0010] Furthermore, a second sealing component is provided at the joint between the connecting rod and the partition, and a third sealing component is provided between the outer surface of the control piston and the inner surface of the control cavity.

[0011] Furthermore, an oil seal component is provided at the interface between the connecting rod and the partition.

[0012] Furthermore, the actuating piston is slidably connected to the inner side of the inner housing, and the actuating piston is located on the other side of the partition corresponding to the control piston. A fourth sealing component is provided between the outer surface of the actuating piston and the inner surface of the inner housing.

[0013] Furthermore, the actuator piston is provided with a connecting hole so that both sides are connected to the external flow channel.

[0014] Furthermore, a limiting step is protruded on the inner surface of the inner shell.

[0015] Compared with the prior art, the advantages of this invention are as follows: when the air pressure in the first and second air chambers is different, the control piston is pushed to the side with lower air pressure, thereby driving the entire valve core to slide. At this time, the actuator piston also slides with the valve core. By sliding the actuator piston, it presses against or moves away from the first sealing component, thus switching the valve to the closed or open state, thereby realizing the pneumatic control of this invention. Of course, the flow rate can also be controlled by controlling the distance between the actuator piston and the first sealing component.

[0016] By placing the control piston inside the control chamber, the control piston is only affected by the gas pressure in the first and second gas chambers, and not by the fluid pressure in the outer flow channel. This allows the present invention to be stably controlled even when the fluid pressure in the outer flow channel is high. Attached Figure Description

[0017] Figure 1 This is a cross-sectional view of the present invention;

[0018] Figure 2This is an exploded cross-sectional view of the present invention;

[0019] Figure 3 This is a schematic diagram of the structure of the piston of this utility model;

[0020] Figure 4 A schematic diagram of the flow direction of the high-pressure pneumatically controlled coaxial valve with the external flow channel structure provided by this utility model when it is in the open state.

[0021] Figure 5 A schematic diagram of the flow direction of the high-pressure pneumatically controlled coaxial valve with the external flow channel structure provided by this utility model when it is in the closed state;

[0022] As shown in the figure, 1. Outer shell; 2. Inner shell; 2.1. Partition; 2.2. Limiting step; 2.3. Fixing seat; 3. Outer flow channel; 4. Valve core; 4.1. Control piston; 4.2. Actuating piston; 4.2.1. Connecting hole; 4.3. Connecting rod; 5. Control chamber; 5.1. First air chamber; 5.2. Second air chamber; 6. Valve seat; 7. Oil seal component; 8. First air hole; 9. Second air hole; 10. First sealing component; 11. Second sealing component; 12. Third sealing component; 13. Fourth sealing component. Detailed Implementation

[0023] The present invention will be further described below with reference to specific embodiments.

[0024] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship, are only for the convenience of describing this utility model 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 utility model.

[0025] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0026] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0027] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0028] like Figure 1-5 As shown, a high-pressure pneumatically controlled coaxial valve with an external flow channel structure includes an outer shell 1 and an inner shell 2. The inner shell 2 is provided with a fixing seat 2.3 that is fixedly connected to the outer shell 1. An external flow channel 3 for fluid flow is formed between the inner surface of the outer shell 1 and the outer surface of the inner shell 2.

[0029] One end of the inner shell 2 is closed, and the other end is provided with a partition 2.1. A control cavity 5 is formed between the closed end of the inner shell 2 and the partition 2.1.

[0030] A valve core 4 is slidably connected to the partition 2.1. One end of the valve core 4 is provided with a control piston 4.1. The control piston 4.1 is located in the control chamber 5 and divides the control chamber 5 into a first air chamber 5.1 and a second air chamber 5.2 that are not interconnected. The fixed base 3 has a first air hole 8 and a second air hole 9 for connecting to the control air source. The first air hole 8 communicates with the first air chamber 5.1, and the second air hole 9 communicates with the second air chamber 5.2.

[0031] The other end of the valve core 4 is provided with an actuating piston 4.2. The outer shell 1 is provided with an annular valve seat 6 corresponding to the actuating piston 4.2. A first sealing component 10 is connected to the valve seat 6. When the air pressure in the second air chamber 5.2 is greater than the air pressure in the first air chamber 5.1, the actuating piston 4.2 slides against the first sealing component 10, so that the valve is in the closed state; when the air pressure in the first air chamber 5.1 is greater than the air pressure in the second air chamber 5.2, the actuating piston 4.2 slides away from the first sealing component 10, so that the valve is in the open state.

[0032] When the air pressure in the first air chamber 5.1 and the second air chamber 5.2 is different, the control piston 4.1 is pushed to the side with lower air pressure, thereby causing the entire valve core 4 to slide. At this time, the actuating piston 4.2 also slides with the valve core 4. By sliding the actuating piston 4.2, it presses against or moves away from the first sealing component 10, thereby switching the valve to the closed or open state, thus realizing the pneumatic control of this utility model. Of course, the flow rate can also be controlled by controlling the distance between the actuating piston 4.2 and the first sealing component 10.

[0033] By placing the control piston 4.1 inside the control chamber 5, the control piston 4.1 is only affected by the gas pressure in the first gas chamber 5.1 and the second gas chamber 5.2, and is not affected by the fluid pressure in the outer flow channel 3. This allows the present invention to be stably controlled even when the fluid pressure in the outer flow channel 3 is high.

[0034] Preferably, the valve core 4 is provided with a connecting rod 4.3, which connects the control piston 4.1 and the actuating piston 4.2. The connecting rod 4.3 passes through the partition 2.1 and is slidably connected to it, thereby realizing the sliding connection between the valve core 4 and the partition 2.1.

[0035] Preferably, a second sealing component 11 is provided at the mating point between the connecting rod 4.3 and the partition 2.1 to form a seal between the control chamber 5 and the outer flow channel 3, and a third sealing component 12 is provided between the outer surface of the control piston 4.1 and the inner surface of the control chamber 5 to form a seal between the first air chamber 5.1 and the second air chamber 5.2.

[0036] Preferably, an oil seal component 7 is provided at the mating point between the connecting rod 4.3 and the partition 2.1 to prevent lubricating oil leakage from the surface of the connecting rod 4.3. This also prevents fluid in the outer flow channel 3 from entering the control chamber 5, and prevents gas or dust in the control chamber 5 from entering the outer flow channel 3.

[0037] Preferably, the oil seal component 7 is a TC oil seal.

[0038] Preferably, the actuating piston 4.2 is slidably connected to the inner side of the inner housing 2. The actuating piston 4.2 is located on the other side of the partition 2.1, corresponding to the control piston 4.1. A fourth sealing component 13 is provided between the outer surface of the actuating piston 4.2 and the inner surface of the inner housing 2 to prevent fluid in the outer flow channel 3 from flowing out from the gap between the actuating piston 4.2 and the inner housing 2 when the valve is in the closed state.

[0039] Preferably, the first sealing component 10, the second sealing component 11, the third sealing component 12, and the fourth sealing component 13 are all sealing rings. For example, a polytetrafluoroethylene (PTFE) sealing ring can provide a certain degree of lubrication while sealing. Alternatively, it can be an EPDM sealing ring, a fluoroplastic sealing ring, or a fluororubber sealing ring, etc.

[0040] Preferably, the actuating piston 4.2 has a connecting hole 4.2.1 so that both sides are connected to the external flow channel 3. This ensures that the pressure on both sides of the actuating piston 4.2 is similar, preventing the actuating piston 4.2 from being pushed due to pressure differences caused by the fluid in the external flow channel 3 acting on both sides. This design can improve the stability and controllability of the valve core 4.

[0041] Preferably, the inner surface of the inner housing 2 is provided with a limiting step 2.2 to prevent the outer surface of the control piston 4.1 from contacting the inner surface of the inner housing 2. If the outer surface of the control piston 4.1 is in contact with the inner surface of the inner housing 2, gas cannot enter between them, causing the piston to be unable to be pushed by gas. This design can enhance the working stability of this utility model.

[0042] Preferably, the limiting step 2.2 is provided on both sides of the control piston 4.1.

[0043] The method of use and workflow of this utility model are as follows: (See attached...) Figure 4 When the first vent 8 is filled with air, the gas flows into the first air chamber 5.1, increasing the air pressure in the first air chamber 5.1 and thus pushing the control piston 4.1 to slide. The control piston 4.1 is connected to the actuating piston 4.2 via the connecting rod 4.3, thereby causing the actuating piston 4.2 to slide away from the first sealing component 10. At this time, the valve is in the open state, and the fluid flows in from one side of the outer flow channel 3, then flows to the other side of the outer flow channel 3, and finally flows out from the inside of the valve seat 6.

[0044] See Figure 5When air is introduced into the second vent 9, the gas flows into the second air chamber 5.2, increasing the air pressure and thus pushing the control piston 4.1 to slide. The control piston 4.1 is connected to the actuating piston 4.2 via the connecting rod 4.3, thereby causing the actuating piston 4.2 to slide and press against the first sealing component 10. At this time, the valve is in the closed state, and the fluid flows in from one side of the outer flow channel 3, then flows to the other side of the outer flow channel 3, and finally cannot flow out from the inside of the valve seat 6 due to the obstruction of the actuating piston 4.2 and the first sealing component 10.

[0045] The advantages of this invention are as follows: When the air pressure in the first air chamber 5.1 and the second air chamber 5.2 is different, the control piston 4.1 will be pushed to the side with lower air pressure, thereby causing the entire valve core 4 to slide. At this time, the actuating piston 4.2 will also slide with the valve core 4. By sliding the actuating piston 4.2, it will press against or move away from the first sealing component 10, thereby switching the valve to the closed or open state, thus realizing the pneumatic control of this invention. Of course, the flow rate can also be controlled by controlling the distance between the actuating piston 4.2 and the first sealing component 10.

[0046] By placing the control piston 4.1 inside the control chamber 5, the control piston 4.1 is only affected by the gas pressure in the first gas chamber 5.1 and the second gas chamber 5.2, and is not affected by the fluid pressure in the outer flow channel 3. This allows the present invention to be stably controlled even when the fluid pressure in the outer flow channel 3 is high.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it; although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features; and these 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 utility model.

Claims

1. A high-pressure pneumatically controlled coaxial valve with an external flow channel structure, characterized in that, It includes an outer shell (1) and an inner shell (2). The inner shell (2) is provided with a fixing seat (2.3) that is fixedly connected to the outer shell (1). An external flow channel (3) for fluid flow is formed between the inner surface of the outer shell (1) and the outer surface of the inner shell (2). One end of the inner shell (2) is closed, and the other end is provided with a partition (2.1). A control cavity (5) is formed between the closed end of the inner shell (2) and the partition (2.1). A valve core (4) is slidably connected to the partition plate (2.1). One end of the valve core (4) is provided with a control piston (4.1). The control piston (4.1) is located in the control chamber (5) and divides the control chamber (5) into a first air chamber (5.1) and a second air chamber (5.2) that are not interconnected. The fixed base (2.3) is provided with a first air hole (8) and a second air hole (9) for connecting the control air source. The first air hole (8) communicates with the first air chamber (5.1), and the second air hole (9) communicates with the second air chamber (5.2). The valve core (4) is provided with an actuating piston (4.2) at the other end. The outer shell (1) is provided with an annular valve seat (6) corresponding to the actuating piston (4.2). A first sealing component (10) is connected to the valve seat (6). When the air pressure in the second air chamber (5.2) is greater than the air pressure in the first air chamber (5.1), the actuating piston (4.2) slides against the first sealing component (10) to keep the valve closed. When the air pressure in the first air chamber (5.1) is greater than the air pressure in the second air chamber (5.2), the actuating piston (4.2) slides away from the first sealing component (10) to keep the valve open.

2. The high-pressure pneumatically controlled coaxial valve with an external flow channel structure according to claim 1, characterized in that, The valve core (4) is provided with a connecting rod (4.3), which connects the control piston (4.1) and the actuating piston (4.2). The connecting rod (4.3) passes through the partition plate (2.1) and is slidably connected to it.

3. The high-pressure pneumatically controlled coaxial valve with an external flow channel structure according to claim 2, characterized in that, A second sealing component (11) is provided at the joint between the connecting rod (4.3) and the partition plate (2.1), and a third sealing component (12) is provided between the outer surface of the control piston (4.1) and the inner surface of the control cavity (5).

4. The high-pressure pneumatically controlled coaxial valve with an external flow channel structure according to claim 2, characterized in that, An oil seal component (7) is provided at the mating point between the connecting rod (4.3) and the partition plate (2.1).

5. A high-pressure pneumatically controlled coaxial valve with an external flow channel structure according to claim 1, characterized in that, The actuator piston (4.2) is slidably connected to the inner side of the inner housing (2). The actuator piston (4.2) is located on the other side of the partition (2.1) corresponding to the control piston (4.1). A fourth sealing component (13) is provided between the outer surface of the actuator piston (4.2) and the inner surface of the inner housing (2).

6. The high-pressure pneumatically controlled coaxial valve with an external flow channel structure according to claim 1, characterized in that, The actuator piston (4.2) is provided with a connecting hole (4.2.1) so that both sides are connected to the external flow channel (3).

7. The high-pressure pneumatically controlled coaxial valve with an external flow channel structure according to claim 1, characterized in that, The inner surface of the inner shell (2) is provided with a limiting step (2.2).

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