Low power pneumatic multiple selection channel device

Abstract

The application discloses a low-power-consumption pneumatic multi-selection one-channel device and belongs to the field of pneumatic control devices. The device comprises a gas-exchange cylinder one, a gas-exchange cylinder two, a connecting cylinder connected with the gas-exchange cylinder one and the gas-exchange cylinder two, an A channel is arranged on the top of the gas-exchange cylinder one, a B channel is arranged on the top of the gas-exchange cylinder two, and a piston plate is slidably arranged in the gas-exchange cylinder one. The device realizes pneumatic multi-selection one-channel switching through a pure mechanical structure, has no extra energy consumption, can be adapted to power-off and explosion-proof working conditions, can realize temporary superimposed gas supply of A and B two-way gases when the A channel fails to have pressure, effectively avoids valve position shaking problems, and guarantees stable switching. When a matched opening and closing mechanism is used to sequentially open and close a gas exhaust hole, residual gas pressure of a fault channel is released, the influence of residual gas pressure on a sealing structure is eliminated, and the standby channel gas supply pressure is effectively stabilized.

Description

Technical Field

[0001] This invention relates to the field of pneumatic control device technology, specifically a low-power pneumatic multi-channel selector. Background Technology

[0002] In industrial automation control systems, intelligent positioners receive control commands and drive valve actuators by outputting air pressure signals, thereby adjusting the valve opening and controlling the process flow.

[0003] In the existing technology, conventional positioner systems usually adopt a single air supply method, that is, one positioner outputs one air pressure to the valve actuator. The drawback of this method is that when the air supply fails (such as insufficient air pressure, pipeline leakage, positioner failure, etc.), the valve actuator will lose driving force, causing the valve to fail to act according to the command, thereby affecting the safety and continuity of the entire production process.

[0004] To improve system reliability, some existing technologies employ redundant designs, i.e., setting up two sets of positioners and two air sources; however, when switching between the two air sources, existing switching devices have the following problems: First, the air path is interrupted during the switching process, which can easily cause a sudden drop in valve actuator pressure, valve position jitter, and poor control accuracy. Second, most existing switching devices are driven by solenoid valves, which rely on external power sources and are limited in use in power outage or explosion-proof scenarios. Summary of the Invention

[0005] The purpose of this invention is to provide a low-power pneumatic multi-channel device to solve the problems of easy gas interruption and valve position fluctuation in the existing technology, and the poor applicability of electromagnetic valve switching to external power supply and explosion-proof power failure environment.

[0006] The technical problem to be solved by the present invention can be achieved by the following technical solution: a low-power pneumatic multi-channel device, including a first air exchange cylinder, a second air exchange cylinder, and a connecting cylinder connecting the first air exchange cylinder and the second air exchange cylinder. An A channel is inserted above the first air exchange cylinder, and a B channel is inserted above the second air exchange cylinder. A piston plate is slidably installed inside the first air exchange cylinder. A piston ring that blocks one side of the connecting cylinder is installed at the bottom of the piston plate. A thrust spring assembly is installed between the bottom of the piston plate and the inner wall of the first air exchange cylinder. A guide post for guiding the movement of the piston plate is also provided at the bottom of the piston ring. The connecting cylinder is equipped with a sliding sealing guide block inside, and a blocking plate is provided on one side of the sealing guide block to block and limit its movement.

[0007] Preferably, a guide rod one is installed at the bottom of the baffle plate, the bottom end of the guide rod one extends to the outside of the connecting cylinder and a guide rod two is fixedly installed thereon, and the end of the guide rod two is connected to the guide post.

[0008] Preferably, the outer side of the connecting cylinder is provided with a sealing cover, the output side of the sealing cover is connected to an execution connecting pipe, and an air outlet A and an air outlet B are opened on the side wall of the connecting cylinder opposite to the sealing cover. The air outlet A is located near the first air exchange cylinder, and the air outlet B is located near the second air exchange cylinder.

[0009] Preferably, the inner wall of the connecting cylinder is provided with a groove for accommodating the baffle plate, the side wall of the first air exchange cylinder is provided with a sliding groove for sliding and limiting the second guide rod, the first air exchange cylinder is provided with a guide sleeve for sliding and limiting the guide column, and the side wall of the guide sleeve is provided with a sliding groove for sliding and limiting the second guide rod.

[0010] Preferably, the sealing guide block has a curved groove inside for connecting the B air outlet and the second air exchange cylinder. The sealing guide block also has a sealing groove inside, and a sealing plate that seals the curved groove is slidably installed in the sealing groove. The sealing guide block also has a limiting groove that communicates with the sealing groove. A protrusion that slides with the limiting groove is installed on the top of the sealing plate, and a compression spring is installed between the protrusion and the limiting groove.

[0011] Preferably, an inner engagement ring is installed on the inner wall of the bottom of the guide sleeve, and an outer engagement ring is embedded on the outer wall of the bottom of the guide post, and the inner engagement ring and the outer engagement ring are engaged and connected.

[0012] Preferably, the top of the first air exchange cylinder is provided with a vent hole in the horizontal direction, and the first air exchange cylinder is also provided with a movable groove that is perpendicularly connected to the vent hole. A blocking column is slidably arranged in the piston groove, and a transmission rod is installed on the top of the blocking column. The top of the transmission rod extends to the outside of the first air exchange cylinder and is connected to a transmission rod. A rectangular concave plate is fixedly installed at the end of the transmission rod.

[0013] Preferably, an upper arc-shaped block is slidably provided inside the rectangular concave plate, and the arc-shaped block is connected to the inner wall of the rectangular concave plate by a thrust spring.

[0014] Preferably, a lower arc-shaped block that engages with the upper arc-shaped block is installed on the outer wall of the guide rod 2.

[0015] Preferably, an elastic sealing skin is installed between the top of the convex plate and the outer wall of the limiting groove.

[0016] Compared with the prior art, the beneficial effects of this application are as follows: 1. In this invention, when the pressure drops due to insufficient air pressure, pipeline leakage, or positioner failure in channel A, the thrust spring assembly rebounds and pushes the piston plate and piston ring upwards, causing the blocking plate, convex plate, and sealing plate to move upwards. The curved groove gradually opens, and the gas in channel B is sent into the sealing cover through the curved groove. During the switching phase, channel A can still output a small amount of gas, and the two gas streams are briefly delivered to the actuator pipe together, eliminating the valve position shaking defect caused by the interruption of gas supply. After the thrust spring assembly is fully reset, the piston ring seals the connection between the connecting cylinder and the first air exchange cylinder, the A channel is completely shut off and the curved groove is fully open, and the B channel is independently supplied with air. Relying on the pure mechanical structure, the multi-channel switching is selected to reduce energy consumption and meet the needs of power outage and explosion-proof conditions.

[0017] 2. In this invention, an interconnected vent hole and movable groove are provided in the first air exchange cylinder, and an opening and closing mechanism is configured consisting of a blocking column, a first transmission rod, a second transmission rod, a rectangular concave plate, a second thrust spring, an upper arc-shaped block, and a lower arc-shaped block located on the second guide rod. During the normal air supply phase of channel A, the blocking column remains blocked by the vent hole. During the air path switching and the piston plate closing channel A, the blocking column is lifted by the abutting cooperation between the lower arc-shaped block and the upper arc-shaped block, and the vent hole is opened to release the internal pressure of channel A, eliminate the adverse effect of residual air pressure on the sealing performance of the piston plate, and stabilize the air supply pressure of channel B. Attached Figure Description

[0018] Figure 1 This is a perspective view of the overall structure of the present invention.

[0019] Figure 2 This is a front view of the internal structure in the initial state of this invention.

[0020] Figure 3 This is a three-dimensional view of the external structure in the initial state of this invention.

[0021] Figure 4 This is a three-dimensional view of the internal structure of the A channel in this invention.

[0022] Figure 5 yes Figure 4 Enlarged 3D view of the structure of region A in the middle.

[0023] Figure 6 This is a front view of the internal structure of the A channel in this invention.

[0024] Figure 7 This is a three-dimensional view of the external structure for opening channel A in this invention.

[0025] Figure 8 This is a front view of the internal structure of the channel conversion structure in this invention.

[0026] Figure 9 This is a front view of the internal structure of the B channel in this invention.

[0027] Figure 10 This is a front view of the internal structure of the sealing guide block in this invention.

[0028] Figure 11 This is a front view of the internal structure of the rectangular concave plate in this invention.

[0029] Figure 12 This is a three-dimensional view of the external structure for opening channel B in this invention.

[0030] Explanation of reference numerals in the attached figures: 1. Air exchanger one; 2. Air exchanger two; 3. Connecting cylinder; 4. Channel A; 5. Channel B; 6. Actuating pipe; 7. Sealing cover; 10. Air outlet A; 11. Air outlet B; 81. Piston plate; 82. Piston ring; 83. Thrust spring assembly; 84. Guide post; 85. Sealing guide block; 86. Baffle plate; 87. Guide rod one; 88. Groove; 89. Guide rod two; 810. Slide groove one; 811. Guide sleeve; 812. Slide groove two; 21. Curved groove; 22. Sealing groove; 23. Sealing plate; 24. Raised plate; 25. Compression spring; 26. Limiting groove; 27. Elastic sealing skin; 91. Vent hole; 92. Movable groove; 93. Blocking column; 94. Transmission rod one; 95. Transmission rod two; 96. Rectangular concave plate; 97. Lower arc block; 98. Upper arc block; 99. Thrust spring two. Detailed Implementation

[0031] The specific embodiments of the present invention will be described in detail below, but it should be understood that the scope of protection of the present invention is not limited to the specific embodiments.

[0032] Example 1 Existing switching mechanisms generally use solenoid valves to control the opening and closing of the air circuit, rely on external power supply for operation, and lose switching capability when power is off. In addition, electrical components pose safety hazards in flammable and explosive environments. At the same time, the air circuit is interrupted during the switching process, which can easily cause sudden pressure drops in the valve actuator, valve position jitter, and poor control accuracy.

[0033] like Figures 1 to 10 In this embodiment, a low-power pneumatic multi-channel device includes an air exchange cylinder 1, an air exchange cylinder 2, and a connecting cylinder 3 connecting the air exchange cylinder 1 and the air exchange cylinder 2. An A channel 4 is inserted above the air exchange cylinder 1, and a B channel 5 is inserted above the air exchange cylinder 2. A piston plate 81 is slidably installed inside the air exchange cylinder 1. A piston ring 82 that blocks one side of the connecting cylinder 3 is installed at the bottom of the piston plate 81. A thrust spring assembly 83 is installed between the bottom of the piston plate 81 and the inner wall of the air exchange cylinder 1. A guide post 84 that guides the movement of the piston plate 81 is also provided at the bottom of the piston ring 82. A sealing guide block 85 is slidably provided inside the connecting cylinder 3. A blocking plate 86 is provided on one side of the sealing guide block 85 to block and limit its movement. A guide rod 87 is installed at the bottom of the blocking plate 86. The bottom end of the guide rod 87 extends to the outside of the connecting cylinder 3 and a guide rod 89 is fixedly installed thereon. The end of the guide rod 89 is connected to the guide post 84. A sealing cover 7 is installed on the outside of the connecting cylinder 3. An actuation connecting pipe 6 is connected to the output side of the sealing cover 7 and connected to the actuation component of the valve body. An air outlet A 10 and an air outlet B 11 are opened on the side wall of the connecting cylinder 3 opposite to the sealing cover 7. The air outlet A 10 is located near the air exchange cylinder 1, and the air outlet B 11 is located near the air exchange cylinder 2.

[0034] The inner wall of the connecting cylinder 3 is provided with a groove 88 for accommodating the baffle plate 86. The side wall of the air exchange cylinder 1 is provided with a sliding groove 810 for sliding and limiting the guide rod 89. The air exchange cylinder 1 is equipped with a guide sleeve 811 for sliding and limiting the guide column 84. The side wall of the guide sleeve 811 is provided with a sliding groove 812 for sliding and limiting the guide rod 89.

[0035] The sealing guide block 85 has a curved groove 21 inside for connecting the B air outlet 11 and the second air exchange cylinder 2. The sealing guide block 85 also has a sealing groove 22 inside. A sealing plate 23 that seals the curved groove 21 is slidably installed in the sealing groove 22. The sealing guide block 85 also has a limiting groove 26 that communicates with the sealing groove 22. A protruding plate 24 that slides with the limiting groove 26 is installed on the top of the sealing plate 23. A compression spring 25 is installed between the protruding plate 24 and the limiting groove 26. An elastic sealing skin 27 is sealed between the top of the protruding plate 24 and the outer wall of the limiting groove 26.

[0036] How the channel switching works: Figure 2 Under normal conditions, gas is introduced into the interior of the first air exchanger 1 through channel A 4. The pressure inside the first air exchanger 1 gradually increases, pushing the piston plate 81 and piston ring 82 downwards. The thrust spring assembly 83 is compressed. Since guide rod 1 87 and guide rod 2 89 are fixedly connected, the end of guide rod 2 89 is fixedly connected to guide post 84, and the top of guide rod 1 87 is fixedly connected to baffle plate 86, when the piston plate 81 is pushed downwards, the guide post 84 drives the baffle plate 86 to move downwards together. As gas continues to be input into channel A 4, the piston plate 81 continues to move downwards until the top of the baffle plate 86 separates from the bottom of the sealing guide block 85. The baffle plate 86 enters the groove 88, and the air pressure inside the first air exchanger 1 pushes the sealing guide block 85 to one side to block the output side of the second air exchanger 2, opening the A outlet 10. The gas in the A outlet 10 enters the actuator pipe 6 through the sealing cover 7. Figure 6 As shown; like Figure 8 , 10When the gas source in channel A malfunctions, such as insufficient gas pressure, pipeline leakage, or positioner failure, the gas pressure in channel A 4 decreases, and gas is introduced into channel B 5. The compressed thrust spring assembly 83 tends to reset and pushes the piston plate 81 and piston ring 82 upward, while the blocking plate 86 moves upward together. When the blocking plate 86 moves upward and pushes the convex plate 24 upward, the convex plate 24 drives the sealing plate 23 to slide upward along the sealing groove 22, gradually opening the curved groove 21. Taking the special state of half-opening as an example, the gas injected in channel B 5 enters the sealing cover 7 through the curved groove 21, and then enters the actuator pipe 6 through the sealing cover 7. At the same time, a small amount of gas in channel A 4 is still input through the connection between the connecting cylinder 3 and the air exchange cylinder 1, and then enters the sealing cover 7 through the A outlet 10. When switching to channel B 5, channel A 4 is still supplying a small amount of gas to avoid interruption of the gas path during the switching process, which would cause a sudden drop in valve actuator pressure, valve position vibration, and poor control accuracy. like Figure 9 As the thrust spring assembly 83 is fully reset, the piston ring 82 completely blocks the connection between the connecting cylinder 3 and the air exchange cylinder 1. At this time, the baffle plate 86 has moved to the highest position, causing the sealing plate 23 to move upward to the highest position, fully opening the curved groove 21, forming a state where channel A 4 is fully automatically closed and channel B 5 is fully open. The channel switching is automatically completed by the spring's reset, which is suitable for power outage and explosion-proof scenarios.

[0037] It should be emphasized that the core improvement of this embodiment is that when the pressure drops due to insufficient air pressure, pipeline leakage, positioner failure, or other faults in channel A 4, the thrust spring assembly 83 rebounds and pushes the piston plate 81 and piston ring 82 upward, along with the blocking plate 86, the protruding plate 24, and the sealing plate 23, causing the curved groove 21 to gradually open. The gas in channel B 5 is then sent into the sealing cover 7 through the curved groove 21. During the switching phase, channel A 4 can still output a small amount of gas, and the two gas streams are briefly delivered together to the actuator pipe 6, eliminating the valve position vibration defect caused by the interruption of gas supply. After the thrust spring assembly 83 is fully reset, the piston ring 82 seals the connection between the connecting cylinder 3 and the air exchange cylinder 1, the A channel 4 is completely shut off, the curved groove 21 is fully open, the B channel 5 is supplied with air independently, and the switching of multiple channels is automatically completed, reducing energy consumption and meeting the requirements of power outage and explosion-proof conditions.

[0038] It should be noted that, such as Figure 2 , Figure 6 When channel A 4 is opened, the baffle plate 86 and the sealing guide block 85 slide together on the left side. When channel B 5 is opened, the baffle plate 86 and the sealing guide block 85 slide together on the right side. That is, the longitudinal length of the inner wall of the connecting cylinder 3 is equal to the longitudinal length of two sealing guide blocks 85 plus one baffle plate 86.

[0039] Example 2 It is understandable that in Embodiment 1, after the channel switching is completed and the piston plate 81 blocks the A channel 4, the internal air pressure of the faulty A channel 4 is prone to pressure fluctuation. This air pressure will act in reverse on the piston plate 81, interfering with the sealing effect of the piston plate 81, and thus causing the output air pressure of the B channel 5 to be unstable.

[0040] like Figure 9 , Figure 11 , Figure 12 To solve the above problems, a vent hole 91 is opened horizontally at the top of the air exchange cylinder 1. A movable groove 92 that is vertically connected to the vent hole 91 is also opened on the air exchange cylinder 1. A blocking column 93 is slidably arranged in the piston groove. A transmission rod 94 is installed on the top of the blocking column 93. The top of the transmission rod 94 extends to the outside of the air exchange cylinder 1 and is connected to a transmission rod 95. A rectangular concave plate 96 is fixedly installed at the end of the transmission rod 95.

[0041] An upper arc-shaped block 98 is slidably provided inside the rectangular concave plate 96, and the arc-shaped block is connected to the inner wall of the rectangular concave plate 96 by a thrust spring 99.

[0042] A lower arc block 97, which is in transmission cooperation with the upper arc block 98, is installed on the outer wall of the guide rod 2 89.

[0043] Working principle: such as Figure 3 Before channel A4 is opened, the lower arc block 97 is located above the upper arc block 98 and is not in contact with it. like Figure 4 , Figure 6 , Figure 7 During the opening of channel A 4, the inclined surface of the lower arc block 97 pushes the inclined surface of the upper arc block 98 inward, causing the upper arc block 98 to move into the rectangular concave plate 96 first. Then, the lower arc block 97 continues to move downward with the guide rod 89 until channel A 4 is fully opened. At this point, the lower arc block 97 moves to below the upper arc block 98, and the upper arc block 98 is reset by the action of the thrust spring 99. like Figure 9 , Figure 11 , Figure 12 When switching channels, guide rod 2 89 moves upward with guide column 84, and the top of lower arc block 97 pushes upper arc block 98 upward. During the process of piston plate 81 blocking channel A 4, through the fixed connection between rectangular concave plate 96 and transmission rod 2 95 and transmission rod 1 94, the blocking column 93 moves upward together. When piston plate 81 completely blocks channel A 4, the blocking column 93 moves to the top of movable groove 92, completing the opening of vent hole 91. This avoids the gas pressure fluctuation caused by fault in channel A 4 after switching to channel B 5, which would affect the blocking effect of piston plate 81 on channel A 4, thus causing unstable gas pressure in channel B 5.

[0044] It should be emphasized that the core improvement of this embodiment lies in: setting an interconnected vent hole 91 and movable groove 92 in the air exchange cylinder 1, and configuring an opening and closing mechanism consisting of a blocking column 93, a transmission rod 1 94, a transmission rod 2 95, a rectangular concave plate 96, a thrust spring 2 99, an upper arc block 98, and a lower arc block 97 located on the guide rod 2 89; during the normal air supply phase of channel A 4, the blocking column 93 remains blocked by the vent hole 91; during the air path switching and the piston plate 81 closing channel A 4, the blocking column 93 is lifted by the abutting cooperation of the lower arc block 97 and the upper arc block 98, and the vent hole 91 is opened to release the internal pressure of channel A 4, eliminate the adverse effect of residual air pressure on the sealing performance of piston plate 81, and stabilize the air supply pressure of channel B 5.

[0045] It should be noted that, such as Figure 8 When the curved groove 21 is half open, the lower arc block 97 does not contact the upper arc block 98. That is, when the piston plate 81 and piston ring 82 are just blocked at the connection between the connecting cylinder 3 and the air exchange cylinder 1, the lower arc block 97 contacts the upper arc block 98.

[0046] It should be noted that when channel A 4 malfunctions, the air pressure input to channel A 4 decreases, and the force of the air pressure and the engagement force between the outer engagement ring 814 on the guide column 84 and the inner engagement ring 813 in the guide sleeve 811 is less than the reaction force of the thrust spring assembly 83 resetting.

[0047] The basic principles, main features, and advantages of this application have been described above. Those skilled in the art should understand that this application is not limited to the above embodiments. The embodiments and descriptions in the specification are merely the principles of this application. Various changes and modifications can be made to this application without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed application.

Claims

1. A low-power pneumatic multi-channel selector device, characterized in that, Includes a first air exchanger (1), a second air exchanger (2), and a connecting cylinder (3) connecting the first air exchanger (1) and the second air exchanger (2). An A channel (4) is inserted above the first air exchanger (1), and a B channel (5) is inserted above the second air exchanger (2). A piston plate (81) is slidably installed inside the first air exchanger (1). A piston ring (82) that blocks one side of the connecting cylinder (3) is installed at the bottom of the piston plate (81). A thrust spring assembly (83) is installed between the bottom of the piston plate (81) and the inner wall of the first air exchanger (1). A guide post (84) that guides the movement of the piston plate (81) is also provided at the bottom of the piston ring (82). The connecting cylinder (3) is provided with a sliding sealing guide block (85), and a blocking plate (86) is provided on one side of the sealing guide block (85) to block and limit its movement.

2. The low-power pneumatic multi-channel selector device as described in claim 1, characterized in that, The bottom of the baffle plate (86) is equipped with a guide rod one (87), the bottom end of the guide rod one (87) extends to the outside of the connecting cylinder (3) and a guide rod two (89) is fixedly installed thereon, and the end of the guide rod two (89) is connected to the guide post (84).

3. The low-power pneumatic multi-channel selector device as described in claim 2, characterized in that, The outer side of the connecting cylinder (3) is provided with a sealing cover (7), and the output side of the sealing cover (7) is connected to an execution connecting pipe (6). An A air outlet (10) and a B air outlet (11) are provided on the side wall opposite to the sealing cover (7). The A air outlet (10) is located near the first air exchange cylinder (1), and the B air outlet (11) is located near the second air exchange cylinder (2).

4. The low-power pneumatic multi-channel selector device as described in claim 2, characterized in that, The inner wall of the connecting cylinder (3) is provided with a groove (88) for accommodating the baffle plate (86), the side wall of the first air exchange cylinder (1) is provided with a sliding groove (810) for sliding limit of the second guide rod (89), the first air exchange cylinder (1) is provided with a guide sleeve (811) for sliding limit of the guide column (84), and the side wall of the guide sleeve (811) is provided with a sliding groove (812) for sliding limit of the second guide rod (89).

5. A low-power pneumatic multi-channel selector as described in claim 3, characterized in that, The sealing guide block (85) has a curved groove (21) inside for connecting the B air outlet (11) and the second air exchange cylinder (2). The sealing guide block (85) also has a sealing groove (22) inside. A sealing plate (23) for sealing the curved groove (21) is slidably installed in the sealing groove (22). The sealing guide block (85) also has a limiting groove (26) inside that communicates with the sealing groove (22). A protruding plate (24) that slides with the limiting groove (26) is installed on the top of the sealing plate (23). A compression spring (25) is installed between the protruding plate (24) and the limiting groove (26).

6. The low-power pneumatic multi-channel selector device as described in claim 5, characterized in that, The end of the protrusion (24) extends to the outside of the limiting groove (26).

7. A low-power pneumatic multi-channel selector as described in claim 2, characterized in that, The top of the first air exchange cylinder (1) is provided with a vent hole (91) in the horizontal direction. The first air exchange cylinder (1) is also provided with a movable groove (92) that is vertically connected to the vent hole (91). A blocking column (93) is slidably arranged in the piston groove. A transmission rod (94) is installed on the top of the blocking column (93). The top of the transmission rod (94) extends to the outside of the first air exchange cylinder (1) and is connected to a transmission rod (95). A rectangular concave plate (96) is fixedly installed at the end of the transmission rod (95).

8. A low-power pneumatic multi-channel selector as described in claim 7, characterized in that, The rectangular concave plate (96) is slidably provided with an upper arc-shaped block (98), and the arc-shaped block is connected to the inner wall of the rectangular concave plate (96) by a thrust spring (99).

9. A low-power pneumatic multi-channel selector as described in claim 8, characterized in that, The guide rod 2 (89) has a lower arc block (97) installed on its outer wall, which is in transmission cooperation with the upper arc block (98).

10. A low-power pneumatic multi-channel selector as described in claim 5, characterized in that, An elastic sealing skin (27) is installed between the top of the convex plate (24) and the outer wall of the limiting groove (26).

Images