Multifunctional pneumatic control coaxial valve with outer flow channel structure

Abstract

The utility model relates to a multifunctional pneumatic control coaxial valve with an outer flow channel structure, which is characterized in that a piston is pushed to prop against a first sealing part by inflating a second air chamber, so that fluid in an outer flow channel cannot flow out; the piston is controlled to slide away from the first sealing component by inflating the first air chamber, so that fluid in the outer flow channel can flow out. By means of the structure, pneumatic control of the pneumatic control device is achieved. A connecting rod and a crank are arranged to be connected with the piston so as to form a crank sliding block mechanism, linear motion of the piston is converted into rotation motion of the crank, and a transmission shaft connected with the crank is driven to rotate. Due to the fact that the opening and closing states and the flow of the valve are related to the motion state of the piston, the opening and closing states or the flow of the valve can be judged through the rotation angle of the transmission shaft, and the opening and closing states or the flow of the valve can be controlled by controlling the rotation angle of the transmission shaft. And other indication or control equipment can be connected, so that a user can observe and control conveniently.

Description

Technical Field

[0001] This utility model relates to the field of pneumatic coaxial valve technology, and in particular to a multifunctional pneumatic 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 pneumatically controlled coaxial valve with an external flow channel reduces internal turbulence and vibration compared to traditional pneumatically controlled coaxial valves, and can also be manufactured in a smaller size. However, its piston is entirely located on the inside, making the piston's movement unclear. This makes it difficult for users to judge and control the valve's open / closed state and flow rate, which is not conducive to achieving accurate automated control and production. 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 multifunctional pneumatically controlled coaxial valve with an external flow channel structure, which can transmit the movement state of its internal piston to the outside, so that the opening and closing state and flow rate of the valve can be easily judged and controlled, and can also be connected to other indicating or control devices for convenient observation and control by the user.

[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: a multifunctional 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 housing is closed, and the other end is slidably connected to a piston on its inner side. A guide is slidably connected to the piston, and the guide is fixed to the outer housing via a valve seat. The valve seat is coaxially arranged with the piston. A partition is provided inside the piston; one side of the partition forms a first air chamber enclosed by the guide and the piston, and the other side of the partition forms a second air chamber enclosed by the inner housing and the piston.

[0007] A drive shaft is installed in the second fixed seat, with one end of the drive shaft protruding outside the second fixed seat and the other end rotatably connected to the inner housing. A connecting rod is rotatably connected to the partition plate, and the connecting rod is connected to the drive shaft via a crank.

[0008] The first fixed base has a first air port and a second air port for connecting to a control air source. The piston has several third air ports. The first air port communicates with the first air chamber through the third air port, and the second air port communicates with the second air chamber.

[0009] 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 piston slides and presses 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 piston slides and moves 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 the 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, a second sealing component is provided between the outer surface of the drive shaft and the second fixed seat.

[0014] Furthermore, the first sealing component and the second sealing component are sealing rings.

[0015] 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.

[0016] Compared with the prior art, the advantages of this utility model are as follows: by inflating the second air chamber, the piston is pushed against the first sealing component, thus preventing the fluid in the outer flow channel from flowing out; by inflating the first air chamber, the piston is controlled to slide away from the first sealing component, thus allowing the fluid in the outer flow channel to flow out. The above structure achieves pneumatic control. A crank-slider mechanism is formed by connecting the piston to a connecting rod and a crank, converting the linear motion of the 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. The valve's open / closed state or flow rate can also be controlled by controlling the rotation angle of the transmission shaft. Furthermore, it can be connected to other indicating or control devices for convenient user observation and control. Attached Figure Description

[0017] Figure 1 This is a cross-sectional view of the present invention at the position of the first fixed base;

[0018] Figure 2 This is a cross-sectional view of the present invention at the position of the second fixing seat;

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

[0020] Figure 4 This is an exploded view of the valve position indicating device of this utility model when it is a valve position indicator;

[0021] Figure 5 This is a cross-sectional view of the present invention in its open state;

[0022] Figure 6 This is a cross-sectional view of the present invention in the closed state;

[0023] As shown in the figure, 1. Outer shell; 2. Inner shell; 2.1. First fixed seat; 2.2. Second fixed seat; 3. Valve seat; 4. Piston; 4.1. Partition plate; 4.2. Third vent; 5. Guide; 6. Outer flow channel; 7. First air chamber; 8. Second air chamber; 9. First vent; 10. Second vent; 11. First sealing component; 12. Second sealing component; 13. Valve position indicator; 13.1. Bracket; 13.2. Shield; 13.3. Indicating hemisphere; 13.4. Connecting shaft; 14. Crank; 15. Drive shaft; 15.1. Positioning groove; 16. Connecting rod. Detailed Implementation

[0024] The present invention will be further described below with reference to specific embodiments.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] like Figure 1-6 As shown, a multifunctional 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 2.1 and a second fixing seat 2.2 fixedly connected to the outer shell 1. An external flow channel 6 for fluid flow is formed between the inner surface of the outer shell 1 and the outer surface of the inner shell 2.

[0030] One end of the inner housing 2 is closed, and the other end is slidably connected to a piston 4. The piston 4 is slidably connected to a guide 5, which is fixed to the outer housing 1 by a valve seat 3. The valve seat 3 is coaxially arranged with the piston 4. A partition 4.1 is provided inside the piston 4. One side of the partition 4.1 is a first air chamber 7 formed by the guide 5 and the piston 4, and the other side of the partition 4.1 is a second air chamber 8 formed by the inner housing 2 and the piston 4.

[0031] A drive shaft 15 is inserted through the second fixed base 2.2. One end of the drive shaft 15 is exposed outside the second fixed base 2.2, and the other end is rotatably connected to the inner housing 2. A connecting rod 16 is rotatably connected to the partition plate 4.1. The connecting rod 16 is driven by the drive shaft 15 through a crank 14. One end of the crank 14 is rotatably connected to the connecting rod 16, and the other end is fixed to the drive shaft 15, so as to convert the linear motion of the piston 4 into the rotational motion of the drive shaft 15.

[0032] The first fixed base 2.1 has a first air hole 9 and a second air hole 10 for connecting to the control air source. The piston 4 has several third air holes 4.2 to improve the air intake speed. The first air hole 9 communicates with the first air chamber 7 through the third air holes 4.2, and the second air hole 10 communicates with the second air chamber 8.

[0033] A first sealing component 11 is connected to the valve seat 3. When the air pressure in the second air chamber 8 is greater than the air pressure in the first air chamber 7, the piston 4 slides and presses against the first sealing component 11, so that the valve is in the closed state; when the air pressure in the first air chamber 7 is greater than the air pressure in the second air chamber 8, the piston 4 slides and moves away from the first sealing component 11, so that the valve is in the open state.

[0034] By inflating the second air chamber 8, the piston 4 is pushed against the first sealing component 11, preventing the fluid in the outer flow channel 6 from flowing out. By inflating the first air chamber 7, the piston 4 is controlled to slide away from the first sealing component 11, allowing the fluid in the outer flow channel 6 to flow out. This structure achieves pneumatic control. A crank-slider mechanism is formed by connecting the piston 4 to the crank 14 via a connecting rod 16, converting the linear motion of the piston 4 into rotational motion with the crank 14, which in turn drives the transmission shaft 15 connected to the 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. The valve's open / closed state or flow rate can also be controlled by controlling the rotation angle of the transmission shaft 15. Furthermore, other indicating or control devices can be connected for convenient observation and control by the user.

[0035] 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.

[0036] Preferably, the drive shaft 15 is connected to the valve position indicator 13 via the positioning groove 15.1 to inform the user of the current valve status.

[0037] Preferably, the valve position indicating device 13 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.

[0038] Preferably, a second sealing component 12 is provided between the outer surface of the drive shaft 15 and the second fixed seat 2.2 to prevent gas leakage from the second air chamber 8.

[0039] Preferably, the first sealing component 11 and the second sealing component 12 are 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, as an embodiment, when the valve position indicating device 13 is a valve position indicator, it includes a bracket 13.1, a shield 13.2, an indicating hemisphere 13.3, and a connecting shaft 13.4. One end of the bracket 13.1 is fixedly connected to the second fixed seat 2.2, and the other end is connected to the shield 13.2. The indicating hemisphere 13.3 is rotatably connected within the space enclosed by the bracket 13.1 and the shield 13.2. The connecting shaft 13.4 passes through the bracket 13.1, and one end of the connecting shaft 13.4 is engaged with the positioning groove 15.1, and the other end is connected to the indicating hemisphere 13.3.

[0041] Preferably, the indicating hemisphere 13.3 is provided with symbols or text indicating the open and closed states, such as "open" and "close". When the piston 4 moves, it drives the transmission shaft 15 to rotate, which in turn drives the connecting shaft 13.4 to rotate, which in turn drives the indicating hemisphere 13.3 to rotate. When the valve is in the closed state, the "open" marking on the indicating hemisphere 13.3 is covered by the shielding cover 13.2, while the "close" marking is visible. When the valve is in the open state, the "close" marking on the indicating hemisphere 13.3 is covered by the shielding cover 13.2, while the "open" marking is visible. This design allows the user to be informed of the valve's open and closed state.

[0042] The method of use and workflow of this utility model are as follows: When air is injected into the first air hole 9, the gas flows into the third air hole 4.2 through the gap between the piston 4 and the inner shell 2, and then flows into the first air chamber 7 from the third air hole 4.2. The air pressure in the first air chamber 7 increases, thereby pushing the piston 4 to slide away from the first sealing component 11. The sliding of the piston 4 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 13 is a valve position indicator at this time, the rotation of the transmission shaft 15 will drive the connecting shaft 13.4 to rotate, thereby driving the indicator hemisphere 13.3 to rotate, so that the word "open" on the indicator hemisphere 13.3 is revealed.

[0043] When air is introduced into the second vent 10, the gas enters the second air chamber 8 through the gap between the piston 4 and the inner housing 2. The air pressure in the second air chamber 8 increases, thereby pushing the piston 4 to slide and press against the first sealing component 11. The sliding of the piston 4 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 closed state, and fluid cannot pass through the valve. If the valve position indicator 13 is a valve position indicator at this time, the rotation of the transmission shaft 15 will drive the connecting shaft 13.4 to rotate, thereby driving the indicator hemisphere 13.3 to rotate, making the word "close" on the indicator hemisphere 13.3 visible.

[0044] When the valve position indicator 13 is a positioner, explosion-proof positioner, or visual indicator, its connection method is similar to that of the valve position indicator, so they will not be listed one by one.

[0045] The advantages of this invention are as follows: by inflating the second air chamber 8, the piston 4 is pushed against the first sealing component 11, thus preventing the fluid in the outer flow channel 6 from flowing out. By inflating the first air chamber 7, the piston 4 is controlled to slide away from the first sealing component 11, allowing the fluid in the outer flow channel 6 to flow out. The above structure achieves pneumatic control. A crank-slider mechanism is formed by connecting the piston 4 to the crank 14 via a connecting rod 16, converting the linear motion of the piston 4 into rotational motion with the crank 14, which in turn drives the transmission shaft 15 connected to the 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. The valve's open / closed state or flow rate can also be controlled by controlling the rotation angle of the transmission shaft 15. Furthermore, other indicating or control devices can be connected for convenient observation and control by the user.

[0046] 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 multifunctional 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 first fixing seat (2.1) and a second fixing seat (2.2) that are fixedly connected to the outer shell (1). An outer flow channel (6) 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 slidably connected to a piston (4) on the inner side. The piston (4) is slidably connected to a guide (5). The guide (5) is fixed on the outer shell (1) by a valve seat (3). The valve seat (3) is coaxially arranged with the piston (4). A partition (4.1) is provided inside the piston (4). One side of the partition (4.1) is a first air chamber (7) formed by the guide (5) and the piston (4). The other side of the partition (4.1) is a second air chamber (8) formed by the inner shell (2) and the piston (4). A drive shaft (15) is provided in the second fixed seat (2.2). One end of the drive shaft (15) is exposed outside the second fixed seat (2.2), and the other end is rotatably connected to the inner shell (2). A connecting rod (16) is rotatably connected to the partition plate (4.1). The connecting rod (16) is connected to the drive shaft (15) through a crank (14). The first fixed base (2.1) is provided with a first air hole (9) and a second air hole (10) for connecting to the control air source. The piston (4) is provided with a plurality of third air holes (4.2). The first air hole (9) communicates with the first air chamber (7) through the third air hole (4.2), and the second air hole (10) communicates with the second air chamber (8). A first sealing component (11) is connected to the valve seat (3). When the air pressure in the second air chamber (8) is greater than the air pressure in the first air chamber (7), the piston (4) slides and presses against the first sealing component (11), so that the valve is in the closed state; when the air pressure in the first air chamber (7) is greater than the air pressure in the second air chamber (8), the piston (4) slides and moves away from the first sealing component (11), so that the valve is in the open state.

2. The multifunctional pneumatically controlled coaxial valve with an 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 multifunctional pneumatically controlled coaxial valve with an external flow channel structure according to claim 2, characterized in that, The drive shaft (15) is connected to the valve position indicator (13) via the positioning groove (15.1).

4. The multifunctional pneumatically controlled coaxial valve with an external flow channel structure according to claim 3, characterized in that, The valve position indicator (13) is one of the following: valve position indicator, positioner, explosion-proof positioner, and visual indicator.

5. A multifunctional pneumatically controlled coaxial valve with an external flow channel structure according to claim 1, characterized in that, A second sealing component (12) is provided between the outer surface of the drive shaft (15) and the second fixed seat (2.2).

6. A multifunctional pneumatically controlled coaxial valve with an external flow channel structure according to claim 5, characterized in that, The first sealing component (11) and the second sealing component (12) are sealing rings.

7. A multifunctional pneumatically controlled coaxial valve with an external flow channel structure according to claim 3, characterized in that, The valve position indicator (13) includes a bracket (13.1), a shield (13.2), an indicator hemisphere (13.3), and a connecting shaft (13.4). One end of the bracket (13.1) is fixedly connected to the second fixed seat (2.2), and the other end is connected to the shield (13.2). The indicator hemisphere (13.3) is rotatably connected within the space enclosed by the bracket (13.1) and the shield (13.2). The connecting shaft (13.4) passes through the bracket (13.1). One end of the connecting shaft (13.4) is engaged with the positioning groove (15.1), and the other end is connected to the indicator hemisphere (13.3).

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