Multifunctional high-pressure pneumatic control coaxial valve with outer flow channel structure

Abstract

The utility model relates to a multifunctional 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. The control piston is arranged in the control cavity, so that the control piston 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 higher. The connecting rod and the crank are connected with the control piston to form a crank sliding block mechanism, the control piston is in transmission connection with the transmission shaft, and the opening and closing state or flow of the valve can be judged according to the rotating angle of the transmission shaft.

Description

Technical Field

[0001] This utility model relates to the field of pneumatically controlled coaxial valve technology, and in particular to a multifunctional 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 pneumatically controlled coaxial valve reduces internal turbulence and vibration compared to traditional pneumatically controlled coaxial valves, and can also be manufactured in a smaller size. However, in existing external flow channel pneumatically controlled 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. Furthermore, since the piston is entirely located on the inside, its movement state is unclear, making it difficult for users to judge and control the valve's open / closed state and flow rate, which is detrimental to achieving accurate automated control and production. Therefore, there is an urgent need for a new type of external flow channel pneumatically controlled coaxial valve that can operate stably even at high internal pressures, while also allowing users to easily judge the valve's open / closed state and flow rate. Utility Model Content

[0004] In view of the current status of the prior art, the technical problem to be solved by this utility model is to provide a multifunctional high-pressure pneumatically controlled coaxial valve with an external flow channel structure. Its piston is not affected by the fluid pressure in the external flow channel, and the movement state of the piston can be transmitted to the outside, so that the valve can work stably under high pressure and it is convenient for users to judge the open and closed state and flow rate of the valve.

[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: a multifunctional high-pressure pneumatically controlled coaxial valve with an external flow channel structure, comprising an outer shell and an inner shell, wherein the inner shell is provided with a first fixing seat and a second fixing seat 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. A valve core is slidably connected to the partition. One end of the valve core is provided with a control piston. The control piston is located in the control cavity and divides the control cavity into a first air chamber and a second air chamber that are not interconnected.

[0007] The first fixed base has a first air hole and a second air hole for connecting to 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] A drive shaft is installed in the second fixed seat, with one end exposed outside the second fixed seat and the other end rotatably connected to the inner housing. A connecting rod is rotatably connected to the control piston, and the connecting rod is connected to the drive shaft via a crank.

[0009] 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.

[0010] Furthermore, the exposed end of the drive shaft is provided with a positioning groove.

[0011] Furthermore, the drive shaft is connected to a valve position indicator via a positioning groove.

[0012] Furthermore, the valve position indicating device is one of a valve position indicator, a positioner, an explosion-proof positioner, and a visual indicator.

[0013] Furthermore, the valve position indicating device includes a bracket, a shield, an indicating hemisphere, and a connecting shaft. One end of the bracket is fixedly connected to the second fixed seat, and the other end is connected to the shield. The indicating hemisphere is rotatably connected within the space enclosed by the bracket and the shield. The connecting shaft passes through the bracket, with one end engaging with the positioning groove and the other end connected to the indicating hemisphere.

[0014] 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.

[0015] Furthermore, an oil seal component is provided at the interface between the connecting rod and the partition.

[0016] Furthermore, the feature is that a second sealing component is provided at the joint between the connecting rod and the partition plate, a third sealing component is provided between the outer surface of the control piston and the inner surface of the control cavity, and a fourth sealing component is provided between the outer surface of the transmission shaft and the second fixed seat.

[0017] Furthermore, the first sealing component, the second sealing component, the third sealing component, and the fourth sealing component are all sealing rings.

[0018] 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.

[0019] 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.

[0020] A crank-slider mechanism is formed by connecting the control piston to the crank via a connecting rod. This mechanism converts the linear motion of the control piston into rotational motion with the crank, which in turn drives the transmission shaft connected to the crank to rotate. Since the valve's open / closed state and flow rate are related to the piston's motion, the valve's open / closed state or flow rate can be determined by the rotation angle of the transmission shaft. Furthermore, other indicating devices can be connected for convenient user observation. Attached Figure Description

[0021] Figure 1 This is a cross-sectional view of the present invention at the position of the first fixed base;

[0022] Figure 2 This is a cross-sectional view of the present invention at the position of the second fixing seat;

[0023] Figure 3 This is a schematic diagram of the transmission mechanism of this utility model;

[0024] Figure 4 This is an exploded view of the valve position indicating device of this utility model when it is a valve position indicator;

[0025] Figure 5 This is a cross-sectional view of the present invention in the open state;

[0026] Figure 6This is a cross-sectional view of the present invention in the closed state;

[0027] As shown in the figure, 1. Outer shell; 2. Inner shell; 2.1. Partition plate; 2.2. First fixed seat; 2.3. Second fixed seat; 3. Outer flow channel; 4. Valve core; 4.1. Control piston; 4.2. Actuating piston; 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; 14. Crank; 15. Drive shaft; 15.1. Positioning groove; 16. Connecting rod; 17. Valve position indicator; 17.1. Bracket; 17.2. Shield; 17.3. Indicating hemisphere; 17.4. Connecting shaft. Detailed Implementation

[0028] The present invention will be further described below with reference to specific embodiments.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] like Figure 1-6 As shown, a multifunctional 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 first fixing seat 2.2 and a second fixing seat 2.3 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.

[0034] One end of the inner housing 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 housing 2 and the partition 2.1. 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 cavity 5 and divides the control cavity 5 into a first air chamber 5.1 and a second air chamber 5.2 that are not interconnected.

[0035] The first fixed base 2.2 has a first air hole 8 and a second air hole 9 for connecting to a 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.

[0036] A drive shaft 15 is inserted through the second fixed base 2.3. One end of the drive shaft 15 is exposed outside the second fixed base 2.3, and the other end is rotatably connected to the inner housing 2. A connecting rod 16 is rotatably connected to the control piston 4.1. The connecting rod 16 is connected to the drive shaft 15 via a crank 14. One end of the crank 14 is rotatably connected to the control piston 4.1, and the other end is fixed to the drive shaft 15, so as to convert the linear motion of the control piston 4.1 into the rotational motion of the drive shaft 15.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] A crank-slider mechanism is formed by connecting rod 16 to crank 14 and then to the control piston 4.1. This mechanism converts the linear motion of the control piston 4.1 into rotational motion with crank 14, which in turn drives the transmission shaft 15 connected to crank 14 to rotate. Since the valve's open / closed state and flow rate are related to the piston 4's motion, the valve's open / closed state or flow rate can be determined by the rotation angle of the transmission shaft 15. Furthermore, other indicating devices can be connected for convenient user observation.

[0041] Preferably, the exposed end of the drive shaft 15 is provided with a positioning groove 15.1 so as to transmit its movement to other devices.

[0042] Preferably, the drive shaft 15 is connected to a valve position indicator 17 via a positioning groove 15.1 to inform the user of the current valve status.

[0043] Preferably, the valve position indicating device 17 is one of a valve position indicator, a positioner, an explosion-proof positioner, and a visual indicator, so that the user can observe the valve's open / closed status or flow rate. Valve position indicators and visual indicators inform the user of the valve's open / closed status. Positioners and explosion-proof positioners allow the user to accurately detect and adjust the valve's open / closed status via a PLC.

[0044] Preferably, as an embodiment, when the valve position indicating device 17 is a valve position indicator, it includes a bracket 17.1, a shield 17.2, an indicating hemisphere 17.3, and a connecting shaft 17.4. One end of the bracket 17.1 is fixedly connected to the second fixed seat 2.3, and the other end is connected to the shield 17.2. The indicating hemisphere 17.3 is rotatably connected within the space enclosed by the bracket 17.1 and the shield 17.2. The connecting shaft 17.4 passes through the bracket 17.1, and one end of the connecting shaft 17.4 is engaged with the positioning groove 15.1, and the other end is connected to the indicating hemisphere 17.3.

[0045] Preferably, the indicating hemisphere 17.3 is provided with symbols or text indicating the open and closed states, such as "open" and "close". When the control piston 4.1 moves, it drives the transmission shaft 15 to rotate, which in turn drives the connecting shaft 17.4 to rotate, which in turn drives the indicating hemisphere 17.3 to rotate. When the valve is in the closed state, the "open" marking on the indicating hemisphere 17.3 is covered by the shielding cover 17.2, while the "close" marking is visible. When the valve is in the open state, the "close" marking on the indicating hemisphere 17.3 is covered by the shielding cover 17.2, while the "open" marking is visible. This design allows the user to be informed of the valve's open and closed state.

[0046] 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.

[0047] Preferably, an oil seal component 7 is provided at the mating point between the connecting rod 4.3 and the partition plate 2.1 to prevent lubricating oil leakage from the surface of the connecting rod 4.3, and also to prevent fluid in the outer flow channel 3 from entering the control chamber 5, and to prevent gas or dust in the control chamber 5 from entering the outer flow channel 3.

[0048] Preferably, the oil seal component 7 is a TC oil seal.

[0049] 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; 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; and a fourth sealing component 13 is provided between the outer surface of the drive shaft 15 and the second fixed seat 2.3 to prevent gas leakage from the second air chamber 5.2.

[0050] 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.

[0051] The method of use and workflow of this utility model are as follows: When the first air hole 8 is filled with air, the gas flows into the first air chamber 5.1, and the air pressure in the first air chamber 5.1 increases, thereby pushing the control piston 4.1 to slide. The control piston 4.1 is connected to the actuating piston 4.2 through the connecting rod 4.3, thereby driving the actuating piston 4.2 to slide away from the first sealing component 10. The sliding of the actuating piston 4.2 is converted into the rotation of the transmission shaft 15 by the connecting rod 16 and the crank 14. At this time, the valve is in the open state, and fluid can pass through the valve. If the valve position indicator 17 is a valve position indicator at this time, the rotation of the transmission shaft 15 will drive the connecting shaft 17.4 to rotate, thereby driving the indicating hemisphere 17.3 to rotate, so that the word "open" on the indicating hemisphere 17.3 is revealed.

[0052] When the second vent 9 is filled with air, the gas flows into the second chamber 5.2, increasing the air pressure and 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, causing the actuating piston 4.2 to slide and press against the first sealing component 10. The sliding of the actuating piston 4.2 is converted into the rotation of the transmission shaft 15 by the connecting rod 16 and the crank 14. At this time, the valve is in the open state, and fluid can pass through the valve. If the valve position indicator 17 is a valve position indicator at this time, the rotation of the transmission shaft 15 will drive the connecting shaft 17.4 to rotate, thereby driving the indicating hemisphere 17.3 to rotate, making the word "close" appear on the indicating hemisphere 17.3.

[0053] 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 multi-functional high pressure pneumatic control coaxial valve of an outer 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 first fixing seat (2.2) and a second fixing seat (2.3) that are fixedly connected to the outer shell (1). An outer 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 on 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 cavity (5) and divides the control cavity (5) into a first air chamber (5.1) and a second air chamber (5.2) that are not interconnected. The first fixed base (2.2) 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). A drive shaft (15) is provided in the second fixed seat (2.3). One end of the drive shaft (15) is exposed outside the second fixed seat (2.3), and the other end is rotatably connected to the inner housing (2). A connecting rod (16) is rotatably connected to the control piston (4.1). The connecting rod (16) is connected to the drive shaft (15) through a crank (14). 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 multi-functional high pressure gas control coaxial valve with external flow channel structure according to claim 1, characterized in that, The exposed end of the drive shaft (15) is provided with a positioning groove (15.1).

3. The multi-functional high pressure gas control coaxial valve with external flow channel structure according to claim 2, characterized in that, The drive shaft (15) is connected to the valve position indicator (17) via the positioning groove (15.1).

4. The multi-functional high pressure gas control coaxial valve with external flow channel structure according to claim 3, characterized in that, The valve position indicator (17) is one of the following: valve position indicator, positioner, explosion-proof positioner, and visual indicator.

5. The multi-functional high pressure gas control coaxial valve with external flow channel structure according to claim 3, characterized in that, The valve position indicator (17) includes a bracket (17.1), a shield (17.2), an indicator hemisphere (17.3), and a connecting shaft (17.4). One end of the bracket (17.1) is fixedly connected to the second fixed seat (2.3), and the other end is connected to the shield (17.2). The indicator hemisphere (17.3) is rotatably connected within the space enclosed by the bracket (17.1) and the shield (17.2). The connecting shaft (17.4) passes through the bracket (17.1). One end of the connecting shaft (17.4) is engaged with the positioning groove (15.1), and the other end is connected to the indicator hemisphere (17.3).

6. The multifunctional 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 (2.1) and is slidably connected to it.

7. The multi-functional high pressure gas control coaxial valve with external flow channel structure according to claim 6, characterized in that, An oil seal component (7) is provided at the joint between the connecting rod (4.3) and the partition (2.1).

8. The multi-functional high pressure gas control coaxial valve with external flow channel structure according to claim 6, 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), 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), and a fourth sealing component (13) is provided between the outer surface of the transmission shaft (15) and the second fixed seat (2.3).

9. The multi-functional high pressure gas control coaxial valve with external flow channel structure according to claim 8, characterized in that, 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.

Images