An integrated automatic control device for explosion-proof fluid and a method thereof

Abstract

The application discloses an integrated automatic control device for explosion-proof fluid and a method thereof, and relates to the technical field of automatic fluid control, comprising a valve body, a displacement adjusting part arranged between an indicating mark and a valve rod, and a sealing compensation part arranged at the bottom of the valve rod and used for increasing the sealing property between the bottom of the valve rod and a valve seat. The displacement adjusting part is arranged to change the distance from the position shifting pin to the center of the transmission connecting shaft by rotating the worm. When the driving rod operates, the first straight connecting slide rail is swung by the position shifting pin. If the distance from the pin to the center of the transmission connecting shaft is closer, the lifting distance of the valve rod will be larger when the driving rod moves downward by a certain distance. If the distance from the pin to the center of the transmission connecting shaft is farther, the lifting distance of the valve rod will be shorter when the driving rod moves downward by a certain distance. The transmission efficiency between the driving rod and the valve rod is adjusted to improve the precision of flow control.

Description

Technical Field

[0001] This invention relates to the field of fluid automatic control technology, specifically to an explosion-proof integrated fluid automatic control device and method. Background Technology

[0002] In the pipeline transportation of fluids such as coal combustion aids, flow meters and regulating valves are typically used in conjunction to achieve stable fluid delivery. When controlling the fluid, the movement distance of the valve core is related to the deformation of the diaphragm within the diaphragm chamber. The greater the diaphragm deformation, the farther the valve core is from the valve seat. The diaphragm deformation is greatest when it moves the valve core to its furthest point from the valve seat; the entire structure is driven solely by the deformation of the diaphragm. Because the diaphragm within the regulating valve exhibits poor stability after deformation, even slight changes in diaphragm deformation can alter the distance between the valve core and the valve seat, significantly changing the flow rate within the valve body. Furthermore, since the position of the regulating valve core needs to be adjusted according to the flow rate through the valve body, repeated diaphragm deformation can occur, thus affecting the accuracy of automatic flow control. Summary of the Invention

[0003] To address the issue of poor accuracy in flow control, the present invention aims to provide an explosion-proof integrated automatic control device and method for fluid control.

[0004] To achieve the above objectives, the present invention provides the following technical solution: an explosion-proof integrated automatic control device for fluids, comprising:

[0005] Valve body;

[0006] A support frame is installed on the top of the valve body; an actuator is provided on the top of the support frame, a positioner is installed on one side of the support frame, a valve stem extending into the valve body is provided on the inner side of the support frame, an indicator strip is installed on the inner wall of the support frame, and an indicator mark that fits into the indicator strip is provided on one side of the valve stem.

[0007] The drive rod is connected to the inside of the actuator and extends to the inside of the support frame;

[0008] A displacement adjusting element, located between the indicator and the valve stem, is used to change the transmission efficiency between the drive rod and the valve stem;

[0009] A sealing compensation element is located at the bottom of the valve stem to increase the sealing between the bottom of the valve stem and the valve seat.

[0010] As a further embodiment of the present invention: the displacement adjusting member includes:

[0011] A U-shaped frame is installed at the bottom of the drive rod; connecting cylinders are installed on both sides of the U-shaped frame, and a bidirectional lead screw is provided on the inner side of the connecting cylinder, which passes through the U-shaped frame; a movable slider extending to the bottom of the connecting cylinder is sleeved on the outer side of the bidirectional lead screw.

[0012] The worm gear is located on the inside of the U-shaped frame;

[0013] The worm gear is located on the outside of the double-acting screw and meshes with the worm.

[0014] As a further embodiment of the present invention: the displacement adjusting member further includes:

[0015] Side plates are installed at both ends of the support frame; a transmission shaft is provided on one side of the side plate and extends to the other side of the side plate;

[0016] The first direct-connect slide rail is fixedly connected to the transmission shaft and is located on the inside of the side plate;

[0017] The shift pin is installed at the bottom of the movable slider and is slidably connected to the first direct-connect slide rail;

[0018] An extension plate is installed at both ends of the transmission coupling; one end of the extension plate is provided with a pressing pin;

[0019] The second direct-connect slide rail is movably sleeved on the outside of the extrusion pin;

[0020] The connecting bracket is installed at the bottom of the second direct-connect slide rail and connected to the top of the valve stem.

[0021] As a further embodiment of the present invention: the top of the movable slider is provided with a threaded hole that matches the bidirectional lead screw, and the bottom of the connecting cylinder is provided with a groove that matches the movable slider.

[0022] As a further embodiment of the present invention: the width of the inner side of the first direct-connect slide rail is equal to the diameter of the shift pin, and the width of the inner side of the second direct-connect slide rail is equal to the diameter of the extrusion pin.

[0023] As a further aspect of the present invention: the distance from the extrusion pin to the center of the transmission shaft is greater than the shortest distance from the shift pin to the center of the transmission shaft, and less than the longest distance from the shift pin to the center of the transmission shaft.

[0024] As a further aspect of the present invention: the sealing compensation member includes:

[0025] An annular corrugated sleeve is connected to the bottom edge of the valve stem, and a base plate is connected to the bottom of the annular corrugated sleeve;

[0026] A thickened sealing ring is provided at the bottom of the base plate, and a threaded sleeve located inside the valve stem is provided at the top of the thickened sealing ring;

[0027] A one-way lead screw is connected to the inside of the threaded sleeve and extends to the top of the valve stem; a limit rod is fixedly connected to one side of the connecting frame.

[0028] A sleeve block is movably fitted onto a limiting rod, and a telescopic spring connected to a connecting frame is provided at the bottom of the sleeve block.

[0029] A ratchet is mounted on the top of a one-way screw, and a pawl that meshes with the ratchet is rotatably connected to one side of the sleeve via a pivot.

[0030] As a further embodiment of the present invention: the inner side of the threaded sleeve is provided with a threaded hole that matches the bottom of the base plate, the top of the base plate is rotatably connected to the connecting frame through a bearing, and the threaded sleeve is slidably connected to the inside of the valve stem.

[0031] As a further embodiment of the present invention: a torsion spring is engaged with the connecting shaft between the pawl and the sleeve block via a slot.

[0032] This invention also discloses an integrated automatic control method for explosion-proof fluids, employing the aforementioned integrated automatic control device for explosion-proof fluids, comprising the following steps:

[0033] S1: Continuously monitors the fluid flow rate inside the valve body through a flow monitor and outputs a monitoring signal;

[0034] S2: Transmit the monitoring signal to the controller, compare it with the preset target flow rate value, and calculate the deviation;

[0035] S3: Based on the magnitude of the deviation, the controller generates an adjustment signal to drive the actuator to move the drive rod upward or downward. During this process, the displacement adjustment component makes the valve rod and the drive rod move simultaneously, and the distance the valve rod moves is greater than the distance the drive rod moves, thereby adjusting the distance between the valve rod and the valve seat, thus changing the cross-sectional area through which the fluid passes.

[0036] S4: Repeat steps S1 to S3 to form a closed-loop control, thereby stabilizing the fluid flow rate within the valve body.

[0037] Compared with the prior art, the beneficial effects of the present invention are:

[0038] 1. By setting a displacement adjustment component, the distance between the shift pin and the center of the transmission shaft is changed by the rotation of the worm gear. When the drive rod operates, it drives the first direct-connect slide rail to swing through the shift pin. At this time, the transmission shaft drives the second direct-connect slide rail to move through the extension plate and the pressing pin. This causes the connecting frame to drive the valve stem to move up or down. Since the distance between the pressing pin and the center of the transmission shaft remains unchanged, the closer the shift pin is to the center of the transmission shaft, the greater the upward distance of the valve stem when the drive rod moves down a certain distance. Similarly, if the shift pin is farther from the center of the transmission shaft, the shorter the upward distance of the valve stem when the drive rod moves down a certain distance. In this way, the transmission efficiency between the drive rod and the valve stem can be adjusted according to the different media conveyed by the valve body, thereby improving the accuracy of flow control.

[0039] 2. By setting a sealing compensation component, the drive rod moves the valve stem back to its original position as the diaphragm inside the actuator returns to its original position. At this time, the thickened sealing ring will fit against the valve seat inside the valve body, thus making the value inside the flow meter zero. If the drive rod returns to its original position completely, the flow meter will still have a value reading, indicating that there is a gap between the thickened sealing ring and the valve seat. Manually turning the ratchet will cause the threaded sleeve to move vertically along the one-way screw, thus increasing the fit between the bottom of the thickened sealing ring and the valve seat, thereby reducing the replacement frequency of the thickened sealing ring. At the same time, the pawl will limit the rotation direction of the ratchet, so that the threaded sleeve can only move downward along the one-way screw. If the thickened sealing ring still cannot fit against the valve seat after turning the ratchet, the thickened sealing ring needs to be replaced. Then, press the sleeve block to misalign the pawl and the ratchet, and then turn the ratchet in the opposite direction to return the base plate to its initial position, so that the base plate fits against the bottom of the valve stem again. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0041] Figure 2 For the present invention Figure 1 Enlarged view of point A in the middle;

[0042] Figure 3 This is a schematic diagram of the inner structure of the support frame of the present invention;

[0043] Figure 4 This is a schematic diagram showing the connection between the valve stem and the drive rod of the present invention;

[0044] Figure 5 This is a schematic diagram showing the connection between the bidirectional lead screw and the first direct-connected slide rail of the present invention;

[0045] Figure 6 This is a schematic diagram of the valve stem top structure of the present invention;

[0046] Figure 7 This is a schematic diagram of the internal structure of the valve stem of the present invention;

[0047] Figure 8 This is a schematic diagram showing the connection between the connecting frame and the first direct-connecting slide rail of the present invention.

[0048] In the diagram: 1. Valve body; 2. Support frame; 3. Actuator; 4. Positioner; 5. Indicator bar; 6. Indicator mark; 7. Valve stem; 8. Drive rod; 9. Connecting frame; 10. Ratchet; 11. Telescopic spring; 12. Sleeve block; 13. Pawl; 14. Side plate; 15. Connecting cylinder; 16. U-shaped frame; 17. Worm gear; 18. Worm wheel; 19. Double-acting screw; 20. Transmission coupling; 21. First direct-drive slide rail; 22. Alternating pin; 23. Movable slider; 24. Limiting rod; 25. Annular corrugated sleeve; 26. Base plate; 27. Thickened sealing ring; 28. Threaded sleeve; 29. ​​One-way screw; 30. Extension plate; 31. Compression pin; 32. Second direct-drive slide rail. Detailed Implementation

[0049] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0050] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this invention, it should be noted that unless otherwise explicitly specified and limited, the terms "installed," "connected," "linked," and "set up" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. The following describes embodiments of the invention based on its overall structure.

[0051] Please see Figures 1 to 8In this embodiment of the invention, an explosion-proof fluid integrated automatic control device includes:

[0052] Valve body 1;

[0053] Support frame 2 is installed on the top of valve body 1; an actuator 3 is provided on the top of support frame 2, a positioner 4 is installed on one side of support frame 2, a valve stem 7 extending into the valve body 1 is provided on the inner side of support frame 2, an indicator strip 5 is installed on the inner wall of support frame 2, and an indicator mark 6 that fits with the indicator strip 5 is provided on one side of valve stem 7.

[0054] The drive rod 8 is connected to the inside of the actuator 3 and extends to the inside of the support frame 2;

[0055] A displacement adjusting element is located between the indicator 6 and the valve stem 7; it is used to change the transmission efficiency between the drive rod 8 and the valve stem 7.

[0056] A sealing compensation component is located at the bottom of the valve stem 7 to increase the sealing between the bottom of the valve stem 7 and the valve seat.

[0057] Please refer to this carefully. Figure 3 , Figure 4 , Figure 5 , Figure 8 The displacement adjusting component includes:

[0058] A U-shaped frame 16 is located at the bottom of the drive rod 8; connecting cylinders 15 are installed on both sides of the U-shaped frame 16, and a bidirectional lead screw 19 is provided on the inner side of the connecting cylinder 15, which passes through the U-shaped frame 16; a movable slider 23 extending to the bottom of the connecting cylinder 15 is sleeved on the outer side of the bidirectional lead screw 19.

[0059] The worm gear 17 is located on the inside of the U-shaped frame 16;

[0060] The worm gear 18 is located on the outside of the double-acting lead screw 19 and meshes with the worm 17.

[0061] The displacement adjusting component also includes:

[0062] Side plates 14 are installed at both ends of the support frame 2; a transmission shaft 20 is provided on one side of the side plate 14 and extends through to the other side of the side plate 14.

[0063] The first direct-connect slide rail 21 is fixedly connected to the transmission shaft 20 and is located inside the side plate 14;

[0064] The shift pin 22 is installed at the bottom of the movable slider 23 and is slidably connected to the first direct-connection slide rail 21;

[0065] An extension plate 30 is installed at both ends of the transmission coupling 20; one end of the extension plate 30 is provided with a pressing pin 31;

[0066] The second direct-connect slide rail 32 is movably sleeved on the outside of the extrusion pin 31;

[0067] The connecting bracket 9 is installed at the bottom of the second direct-connect slide rail 32 and connected to the top of the valve stem 7.

[0068] The movable slider 23 has a threaded hole at its top that matches the bidirectional lead screw 19, and the connecting cylinder 15 has a groove at its bottom that matches the movable slider 23. The width of the inner side of the first direct connecting slide rail 21 is equal to the diameter of the shift pin 22, and the width of the inner side of the second direct connecting slide rail 32 is equal to the diameter of the pressing connecting pin 31. The distance from the pressing connecting pin 31 to the center of the transmission shaft 20 is greater than the shortest distance from the shift pin 22 to the center of the transmission shaft 20, and less than the longest distance from the shift pin 22 to the center of the transmission shaft 20.

[0069] In this embodiment: Rotating the worm gear 17 causes the worm wheel 18 to drive the bidirectional lead screw 19 to rotate. At this time, the movable slider 23 on the bidirectional lead screw 19 moves horizontally along the lead screw 19, and the shift pin 22 moves synchronously with the movable slider 23, thereby changing the distance between the shift pin 22 and the center of the transmission shaft 20. When the drive rod 8 operates, it drives the first direct-connection slide rail 21 to swing via the shift pin 22. At this time, the transmission shaft 20 drives the second direct-connection slide rail 32 to move via the extension plate 30 and the pressing pin 31. This allows the connecting frame 9 to move the valve stem 7 upwards or downwards. Since the distance between the pressing pin 31 and the center of the transmission shaft 20 remains constant, the closer the shift pin 22 is to the center of the transmission shaft 20, the greater the upward distance of the valve stem 7 when the drive rod 8 moves downwards by a certain distance. Similarly, if the shift pin 22 is farther from the center of the transmission shaft 20, the shorter the upward distance of the valve stem 7 when the drive rod 8 moves downwards by a certain distance. In this way, the transmission efficiency between the drive rod 8 and the valve stem 7 can be adjusted according to the different media conveyed by the valve body 1, thereby improving the accuracy of flow control.

[0070] Please refer to this carefully. Figure 2 , Figure 6 , Figure 7 The sealing compensation components include:

[0071] An annular bellows sleeve 25 is connected to the bottom edge of the valve stem 7; a base plate 26 is connected to the bottom of the annular bellows sleeve 25.

[0072] A thickened sealing ring 27 is provided at the bottom of the base plate 26; a threaded sleeve 28 located inside the valve stem 7 is provided at the top of the thickened sealing ring 27.

[0073] A one-way lead screw 29 is connected to the inside of the threaded sleeve 28 and extends above the valve stem 7; a limit rod 24 is fixedly connected to one side of the connecting bracket 9;

[0074] Sleeve 12 is movably sleeved on limit rod 24; the bottom of sleeve 12 is provided with telescopic spring 11 connected to connecting frame 9;

[0075] Ratchet 10 is mounted on the top of one-way screw 29; a pawl 13 that meshes with ratchet 10 is rotatably connected to one side of sleeve block 12 via a rotating shaft.

[0076] The inner side of the threaded sleeve 28 is provided with a threaded hole that matches the bottom of the base plate 26. The top of the base plate 26 is rotatably connected to the connecting frame 9 through a bearing. The threaded sleeve 28 is slidably connected to the inside of the valve stem 7. A torsion spring is engaged with the connecting shaft of the pawl 13 and the sleeve block 12 through a slot.

[0077] In this embodiment: As the diaphragm inside the actuator 3 returns to its original position, the drive rod 8 drives the valve stem 7 to return to its original position. At this time, the thickened sealing ring 27 will fit against the valve seat inside the valve body 1, thus making the value inside the flow meter zero. If the drive rod 8 returns to its original position completely, the flow meter will still have a value reading, indicating that there is a gap between the thickened sealing ring 27 and the valve seat. Manually turning the ratchet 10 will cause the threaded sleeve 28 to move vertically along the one-way screw 29, thereby increasing the fit between the bottom of the thickened sealing ring 27 and the valve seat. This reduces the frequency of replacing the thickened sealing ring 27. At the same time, the pawl 13 limits the rotation direction of the ratchet 10, so that the threaded sleeve 28 can only move down along the one-way screw 29. If the thickened sealing ring 27 still cannot fit with the valve seat after turning the ratchet 10, the thickened sealing ring 27 needs to be replaced. Then, press the sleeve block 12 to make the pawl 13 and the ratchet 10 misalign. Then, turn the ratchet 10 in the opposite direction to restore the base plate 26 to the initial position, so that the base plate 26 fits with the bottom of the valve stem 7 again.

[0078] The following describes an explosion-proof integrated automatic control method for fluids, based on the aforementioned explosion-proof integrated automatic control device, specifically including the following steps:

[0079] S1: Continuously monitor the fluid flow rate in the valve body through a flow monitor (such as an electromagnetic flow meter, turbine flow meter or differential pressure transmitter) and output a monitoring signal (such as a 4-20mA current or digital signal).

[0080] S2: Transmit the monitoring signal to the controller (such as PLC, DCS or dedicated regulator), compare it with the preset target flow value, and calculate the deviation (i.e. the difference between the preset target flow value and the actual flow value).

[0081] S3: Based on the magnitude of the deviation, the controller generates an adjustment signal to drive the actuator to move the drive rod upward or downward. During this process, the displacement adjustment component makes the valve rod and the drive rod move simultaneously, and the distance the valve rod moves is greater than the distance the drive rod moves, thereby adjusting the distance between the valve rod and the valve seat, thereby changing the cross-sectional area through which the fluid passes and realizing the increase or decrease of flow rate.

[0082] S4: Repeat steps S1 to S3 to form a closed-loop control, so that the fluid flow rate in the valve body is stabilized near the preset target flow rate value.

[0083] In step S3, the controller can generate an adjustment signal through a control algorithm such as PID control to drive the actuator 3 to move. Before this, the worm gear 17 is rotated, which causes the worm wheel 18 to drive the bidirectional lead screw 19 to rotate. At this time, the movable slider 23 on the bidirectional lead screw 19 will move horizontally along the bidirectional lead screw 19, and the shift pin 22 moves synchronously with the movable slider 23 to change the distance between the shift pin 22 and the center of the transmission shaft 20. When the drive rod 8 moves, it will drive the first direct-connect slide rail 21 to swing through the shift pin 22. At this time, the transmission shaft 20 will drive the second direct-connect slide rail 32 to move through the extension plate 30 and the pressing pin 31 to move the connecting frame. 9 drives the valve stem 7 to move upward or downward. Since the distance between the pressing pin 31 and the center of the transmission shaft 20 remains unchanged, the closer the position pin 22 is to the center of the transmission shaft 20, the greater the upward distance of the valve stem 7 when the drive rod 8 moves downward by a certain distance. Similarly, if the position pin 22 is farther from the center of the transmission shaft 20, the shorter the upward distance of the valve stem 7 when the drive rod 8 moves downward by a certain distance. In this way, the transmission efficiency between the drive rod 8 and the valve stem 7 can be adjusted according to the different media conveyed by the valve body 1, thereby improving the accuracy of flow control. The operation of the actuator 3 causes the drive rod 8 to move upward or downward. During this process, the displacement adjustment component makes the valve stem 7 and the drive rod 8 move simultaneously.

[0084] In step S4, the flow monitor continuously feeds back new flow values, forming a closed-loop control until the actual flow stabilizes near the target value. The drive rod 8, as the diaphragm inside the actuator 3 returns to its original position, drives the valve stem 7 to return to its original position. At this time, the thickened sealing ring 27 will fit against the valve seat inside the valve body 1, thus making the flow meter's internal value zero. If the drive rod 8 returns to its original position completely, the flow meter will still have a reading, indicating a gap between the thickened sealing ring 27 and the valve seat. Manually turning the ratchet 10 will cause the threaded sleeve 28 to move vertically along the one-way screw 29, thus increasing the flow rate. The thickened sealing ring 27 is fitted to the valve seat at the bottom, which reduces the replacement frequency of the thickened sealing ring 27. At the same time, the pawl 13 limits the rotation direction of the ratchet 10, so that the threaded sleeve 28 can only move down along the one-way screw 29. If the thickened sealing ring 27 still cannot fit with the valve seat after turning the ratchet 10, the thickened sealing ring 27 needs to be replaced. Then, press the sleeve block 12 to make the pawl 13 and the ratchet 10 misalign. Then, turn the ratchet 10 in the opposite direction to restore the base plate 26 to the initial position, so that the base plate 26 fits with the bottom of the valve stem 7 again.

[0085] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An explosion-proof integrated automatic control device for fluid, characterized in that, include: Valve body (1); A support frame (2) is installed on the top of the valve body (1); an actuator (3) is provided on the top of the support frame (2); a positioner (4) is installed on one side of the support frame (2); a valve stem (7) extending into the valve body (1) is provided on the inner side of the support frame (2); an indicator strip (5) is installed on the inner wall of the support frame (2); and an indicator mark (6) that fits against the indicator strip (5) is provided on one side of the valve stem (7). The drive rod (8) is connected to the inside of the actuator (3) and extends to the inside of the support frame (2); A displacement adjustment element is provided between the indicator (6) and the valve stem (7) to change the transmission efficiency between the drive rod (8) and the valve stem (7); A sealing compensation component is provided at the bottom of the valve stem (7) to increase the sealing between the bottom of the valve stem (7) and the valve seat; The displacement adjusting component includes: A U-shaped frame (16) is set at the bottom of the drive rod (8); connecting cylinders (15) are installed on both sides of the U-shaped frame (16), and a bidirectional lead screw (19) that passes through the U-shaped frame (16) is provided on the inner side of the connecting cylinder (15), and a movable slider (23) extending to the bottom of the connecting cylinder (15) is sleeved on the outer side of the bidirectional lead screw (19). The worm gear (17) is located on the inside of the U-shaped frame (16); The worm gear (18) is located on the outside of the double-acting screw (19) and meshes with the worm (17); Side plates (14) are installed at both ends of the support frame (2); a transmission shaft (20) is provided on one side of the side plate (14) and extends to the other side of the side plate (14). The first direct-connect slide rail (21) is fixedly connected to the transmission shaft (20) and located inside the side plate (14); The shift pin (22) is installed at the bottom of the movable slider (23) and is slidably connected to the first direct-connection slide rail (21); An extension plate (30) is installed at both ends of the transmission coupling shaft (20); one end of the extension plate (30) is provided with a pressing pin (31). The second direct-connect slide rail (32) is movably sleeved on the outside of the extrusion connecting pin (31); The connecting bracket (9) is installed at the bottom of the second direct-connect slide rail (32) and connected to the top of the valve stem (7); The top of the movable slider (23) is provided with a threaded hole that matches the bidirectional lead screw (19), and the bottom of the connecting cylinder (15) is provided with a groove that matches the movable slider (23). The width of the inner side of the first direct-connect slide rail (21) is equal to the diameter of the shift pin (22), and the width of the inner side of the second direct-connect slide rail (32) is equal to the diameter of the extrusion pin (31). The distance from the extrusion pin (31) to the center of the transmission shaft (20) is greater than the shortest distance from the shift pin (22) to the center of the transmission shaft (20), and less than the longest distance from the shift pin (22) to the center of the transmission shaft (20).

2. The explosion-proof integrated automatic control device for fluids according to claim 1, characterized in that, The sealing compensation component includes: An annular corrugated sleeve (25) is connected to the bottom edge of the valve stem (7), and a base plate (26) is connected to the bottom of the annular corrugated sleeve (25). A thickened sealing ring (27) is provided at the bottom of the base plate (26); a threaded sleeve (28) located inside the valve stem (7) is provided at the top of the thickened sealing ring (27). A one-way lead screw (29) is connected to the inside of the threaded sleeve (28) and extends above the valve stem (7); a limit rod (24) is fixedly connected to one side of the connecting frame (9). The sleeve (12) is movably sleeved on the limiting rod (24); the bottom of the sleeve (12) is provided with a telescopic spring (11) connected to the connecting frame (9). A ratchet (10) is installed on the top of a one-way screw (29); one side of the sleeve (12) is rotatably connected to a pawl (13) that meshes with the ratchet (10) via a rotating shaft.

3. The explosion-proof integrated automatic control device for fluids according to claim 2, characterized in that, The inner side of the threaded sleeve (28) is provided with a threaded hole that matches the bottom of the base plate (26). The top of the base plate (26) is rotatably connected to the connecting frame (9) through a bearing. The threaded sleeve (28) is slidably connected to the inside of the valve stem (7).

4. The explosion-proof integrated automatic control device for fluids according to claim 2, characterized in that, A torsion spring is engaged with the connecting shaft between the pawl (13) and the sleeve (12) via a slot.

5. An explosion-proof fluid integrated automatic control method, employing the explosion-proof fluid integrated automatic control device according to any one of claims 1-4, characterized in that, Includes the following steps: S1: Continuously monitors the fluid flow rate inside the valve body through a flow monitor and outputs a monitoring signal; S2: Transmit the monitoring signal to the controller, compare it with the preset target flow rate value, and calculate the deviation; S3: The rotation of the worm (17) causes the worm wheel (18) to drive the double-acting screw (19) to rotate. At this time, the movable slider (23) on the double-acting screw (19) will move horizontally along the double-acting screw (19), and the shift pin (22) moves synchronously with the movable slider (23) to change the distance between the shift pin (22) and the center of the transmission shaft (20). According to the magnitude of the deviation, the controller generates an adjustment signal to drive the actuator (3) to move the drive rod (8) upward or downward. During this process, the displacement adjustment component makes the valve stem (7) and the drive rod (8) move simultaneously, and the distance that the valve stem (7) moves is greater than the distance that the drive rod (8) moves, thereby adjusting the distance between the valve stem (7) and the valve seat, thereby changing the cross-sectional area through which the fluid passes. S4: Repeat steps S1 to S3 to form a closed-loop control, thereby stabilizing the fluid flow rate within the valve body.

Images