A precision electric actuator for regulating valves and method

Abstract

The present application belongs to the technical field of valve control, and particularly relates to a precise electric actuator and method for regulating valve. The electric actuator comprises a communication pipe assembly and a butterfly valve assembly. The communication pipe assembly comprises a pipe body, one side of the outer wall surface of the pipe body is fixedly connected with one end of a connecting pipe, the other end of the connecting pipe is fixedly connected with a blocking column. The butterfly valve assembly comprises a butterfly valve body, the butterfly valve body is accommodated in the inner cavity of the pipe body, the top of the butterfly valve body is fixedly connected with one end of a first main shaft, the other end of the first main shaft is coaxially fixedly connected with one end of a second main shaft, the first main shaft is inserted into the connecting pipe, and the blocking column is wrapped on the outer wall surface of the second main shaft. The present application can ensure that the regulating valve is always in full open state, so that the flow capacity is stable and reliable, and the precise requirement of maximum flow for working condition is met. The present application can improve the efficiency of on-site debugging, troubleshooting and emergency operation, and can improve the precision of repeated positioning and realize high-precision control of valve opening.

Description

Technical Field

[0001] This invention belongs to the field of valve control technology, specifically relating to a precision electric actuator and method for regulating valves. Background Technology

[0002] Electric actuators for control valves are crucial components in industrial automation control systems, widely used in pipeline fluid control in industries such as petroleum, chemical, power, metallurgy, and water treatment. Their basic function is to convert electrical signals from the control system into mechanical displacement, driving the valve to open or close, or adjusting its opening, thereby achieving automatic control of fluid parameters such as flow rate, pressure, and temperature.

[0003] Chinese patent application CN202211541780.1 discloses a novel cylinder-type actuator for nuclear power plant regulating valves, belonging to the technical field of actuators for nuclear power valves. It includes a mechanically adjustable limiting screw, a spring, a piston, a push rod, and, from top to bottom, a cover, a spring cover assembly, a piston cylinder, a lower end cover, and a support assembly. The piston cylinder contains a piston, which is fitted with a lower spring seat. The upper and lower ends of the spring are connected to the spring cover assembly and the lower spring seat, respectively. One end of the mechanically adjustable limiting screw is threaded into the spring cover assembly, and the other end is slidably engaged with the lower spring seat. A guide sleeve is fitted inside a bushing via a snap ring, and the bushing is fitted inside the lower end cover. One end of the push rod is connected to the support assembly, and the other end is connected to the piston via a pressure cap. Its purpose is to solve the problems of existing cylinder-type actuators lacking an adjustable mechanical limiting structure and having separate spring covers and piston cylinders, resulting in high costs. The structure is simple and compact, effectively reducing the height of the cylinder actuator and the center of gravity of the entire device, thus improving the stability and reliability of the equipment.

[0004] However, existing electric actuators have the following obvious shortcomings in practical applications: Second, the fully open position when the valve is at its maximum opening cannot be accurately maintained. After long-term frequent operation, the butterfly valve is prone to excessive rotation angle, causing the fully open position to deviate and making it impossible to accurately maintain the maximum opening value. This affects the maximum flow capacity of the control valve and causes the system flow control to be inaccurate. Third, the opening of the internal valve body cannot be intuitively judged. The butterfly valve body of traditional actuators is enclosed inside the pipe body, and the operator cannot directly observe the actual rotation angle of the valve body. During manual debugging or troubleshooting, it is usually necessary to use external instruments or disassemble part of the structure to know the valve opening, which is cumbersome and inefficient. First, the positioning accuracy is low and the valve opening cannot be accurately controlled. Traditional position feedback elements mostly use analog potentiometers, whose output signals are easily affected by factors such as temperature drift, power fluctuation, and mechanical wear, resulting in large detection errors. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a precision electric actuator for control valves. Through the coordinated operation of the connecting pipe assembly, butterfly valve assembly, motor assembly, limit switch assembly, junction box, and connecting sleeve, this invention avoids the deflection errors caused by temperature drift, power fluctuations, and mechanical wear in traditional electric actuators, improving repeatability and achieving highly precise control of valve opening. It also ensures stable and reliable flow capacity of the control valve in its fully open state, meeting the precise requirements for maximum flow under operating conditions. Furthermore, it significantly improves the efficiency of on-site commissioning, troubleshooting, and emergency operation.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A precision electric actuator for regulating valves includes a connecting pipe assembly and a butterfly valve assembly. The connecting pipe assembly includes a pipe body, one side of which is fixedly connected to one end of a connecting pipe, and the other end of the connecting pipe is fixedly connected to a blocking column. The butterfly valve assembly includes a butterfly valve body housed within the inner cavity of the pipe body. One end of a first main shaft is fixedly connected to the top of the butterfly valve body, and the other end of the first main shaft is coaxially fixedly connected to one end of a second main shaft. The first main shaft is inserted into the connecting pipe. The blocking column covers the outer wall of the second main shaft and is composed of a V-shaped arc plate and a semi-circular arc plate. A groove is formed on the outer wall of the second main shaft along its length, and a limiting block is slidably connected in the groove. A limiter gear and a motor gear are circumferentially arranged on the outer wall of the second main shaft. The limiter gear meshes with the gear on the limiter shaft of the limiter assembly, and the motor gear meshes with the gear on the motor shaft of the motor assembly. The motor of the motor assembly is electrically connected to the limiter of the limiter assembly. The limit switch is configured to receive a signal indicating the number of rotations of the limit switch shaft, and after the limit switch shaft rotates to a set number of rotations, send a signal to the motor to stop the motor shaft from rotating.

[0007] Furthermore, the limiting block contacts the arc edge of the V-shaped arc plate, and the height of both the V-shaped arc plate and the slide groove is lower than the height of the semi-circular arc plate.

[0008] Furthermore, the limiting block includes a sliding part and a contact part. The sliding part is placed in a slide groove, and an inner groove is provided on the inner wall of the slide groove. The inner groove is aligned with the length direction of the slide groove, and the sliding part is slidably connected in the inner groove. The contact part contacts the arc edge of the V-shaped arc plate, and the arc edge of the V-shaped arc plate faces upward.

[0009] Furthermore, a connecting sleeve is fixedly installed on the second spindle. The connecting sleeve includes a cylindrical body, and spindle mounting holes are provided on both the upper and lower sides of the cylindrical body. The second spindle passes through the two spindle mounting holes.

[0010] Furthermore, the limiter gear and the motor gear are located between the two main shaft mounting holes in the cylinder.

[0011] Furthermore, the left and right sides of the cylinder are respectively provided with motor mounting holes and limiter mounting holes. The motor assembly includes a motor housing, in which the motor is fixedly mounted. The opening of the motor housing is fixedly connected to the motor mounting hole, and the motor shaft passes through the motor mounting hole. The limiter assembly includes a limiter housing, in which the limiter is fixedly mounted. The opening of the limiter housing is fixedly connected to the limiter mounting hole, and the limiter shaft passes through the limiter mounting hole.

[0012] Furthermore, the limiter assembly includes a contactor and a rotary switch. The contactor is fixedly connected to the side of the limiter facing away from the limiter shaft and is housed within the limiter housing. The rotary switch is fixedly connected to the outer wall of the limiter housing. The rotary switch is configured such that when the rotary switch is rotated, the contactor operates, providing power to the motor to drive the motor shaft to rotate.

[0013] Furthermore, a junction box hole is provided on the front of the cylinder, and the junction box is fixedly connected to the junction box hole. An external power cable connected in series with the motor and contactor is connected in the junction box.

[0014] Furthermore, the butterfly valve assembly includes a manual rotary table, which is fixedly connected to the other end of the second spindle away from the first spindle.

[0015] This invention also claims a method for regulating a valve using the aforementioned precision electric actuator, comprising the following steps: S101: When the cross section of the butterfly valve body is parallel to the cross section of the pipe body, the valve is in the fully closed state with an opening value of zero. At this time, the contact part of the limit block contacts the lowest point of the arc edge of the V-shaped arc plate. S102: Twist the rotary switch, and the control signal is transmitted through the junction box to the contactor in the limit switch assembly. The contactor is engaged, the power cable supplies power to the motor, the motor rotates forward, and the motor shaft rotates. S103: The gear on the motor shaft meshes with the motor gear, driving the second main shaft to rotate. The second main shaft drives the butterfly valve body to rotate in the inner cavity of the pipe body through the first main shaft which is coaxially fixedly connected to it, thereby changing the valve opening. S104: The limiter gear on the second main shaft rotates synchronously, driving the limiter shaft meshing with it to rotate. The limiter receives the rotation number signal of the limiter shaft in real time. The rotation number of the limiter corresponds to the rotation angle of the butterfly valve body and the valve opening value. S105: During operation, the limit switch continuously compares the current number of revolutions with the preset target number of revolutions. When the limit switch shaft rotates to the set number of revolutions, the valve reaches the target opening value, the contactor immediately disconnects, the motor is de-energized, the motor shaft stops rotating, and under the self-locking action of gear meshing, the butterfly valve body is precisely positioned at the target opening value. S106: When the contact part of the limit block continues to rotate on the second main shaft, it is pushed by the arc edge of the V-shaped arc plate, which drives the sliding part to slide upward in the groove until the contact part reaches the highest point of the arc edge of the V-shaped arc plate. The cross section of the butterfly valve body is perpendicular to the cross section of the pipe body, the valve opening value is at its maximum, and the side of the contact part abuts against the semi-circular arc plate to form a stop, preventing the main shaft from rotating excessively, so that the valve can accurately maintain the maximum opening value. S107: Twist the rotary switch in the opposite direction, the contactor engages, the motor reverses, causing the second main shaft to rotate, which in turn drives the butterfly valve body to rotate in the inner cavity of the pipe until the cross-section of the butterfly valve body is parallel to the cross-section of the pipe body. The sliding part slides downward in the slide groove to the lowest point of the arc edge of the V-shaped arc plate, and the valve resets to the fully closed state.

[0016] Compared with the prior art, the present invention has the following beneficial effects: (1) The present invention can ensure that the regulating valve is accurately kept in the fully open state with the maximum opening. The blocking column is composed of a V-shaped arc plate and a semi-circular arc plate. A groove is opened along the length direction on the second main shaft. The limiting block is slidably connected in the groove. When the valve reaches the fully open state, the cross section of the butterfly valve body is perpendicular to the cross section of the pipe body. The contact part of the limiting block reaches the highest point of the arc edge of the V-shaped arc plate. Its side abuts against the semi-circular arc plate to form a rigid mechanical stop. This stop provides a precise and repeatable positioning reference for the fully open state. No matter how many times it is frequently operated, the mechanical limit can lock the butterfly valve body in the same maximum opening position, effectively eliminating the excessive rotation angle and full opening position deviation caused by gear backlash, motor inertia or small fluctuations in control signal, thereby ensuring that the flow capacity of the regulating valve in the fully open state is stable and reliable, and meeting the precise requirements of the working condition for the maximum flow rate.

[0017] (2) This invention improves the efficiency of on-site debugging, troubleshooting, and emergency operation. The contact part of the limit block is located outside the blocking column and is visible throughout. At the same time, there is a one-to-one correspondence between the position of the contact part of the limit block on the arc edge of the V-shaped arc plate and the rotation angle of the butterfly valve body enclosed inside the cylinder. When the contact part is at the lowest point of the arc edge, it corresponds to fully closed, and the valve opening is zero. When the contact part is at the highest point of the arc edge, it corresponds to fully open, and the valve opening is at its maximum. The middle position corresponds to the middle opening. On-site operators do not need to use any instruments or disassemble any parts. They can quickly and intuitively judge the current opening of the internal butterfly valve body by simply observing the specific position of the contact part on the arc edge of the V-shaped arc plate. Based on this, operators can rotate the manual turntable while observing the position change of the contact part, realizing manual precise adjustment while observing, which greatly improves the efficiency of on-site debugging, troubleshooting, and emergency operation.

[0018] (3) The present invention can achieve high precision control of valve opening. The present invention transmits the rotational motion of the second main shaft synchronously to the limiter through the meshing transmission of the limiter gear and the limiter shaft gear. In the actual adjustment process, the gear on the motor shaft meshes with the motor gear, driving the second main shaft to rotate. The second main shaft drives the butterfly valve body to rotate in the inner cavity of the pipe body through the first main shaft fixedly connected to the same axis, changing the valve opening. At the same time, the limiter gear on the second main shaft rotates synchronously, driving the limiter shaft meshing with it to rotate. The limiter receives the rotation number signal of the limiter shaft in real time, and the rotation number of the limiter corresponds to the rotation angle of the butterfly valve body and the valve opening value. During operation, the limiter continuously compares the current number of rotations with the preset target number of rotations. When the limiter shaft rotates to the set number of rotations, the valve reaches the target opening value, the contactor immediately disconnects, the motor is de-energized, and the motor shaft stops rotating. Under the self-locking action of gear meshing, the butterfly valve body is accurately positioned at the target opening value. It avoids the deflection error caused by factors such as temperature drift, power fluctuation, and mechanical wear in traditional electric actuators, improves the accuracy of repeatability, and achieves high-precision control of valve opening. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of a precision electric actuator for a regulating valve according to the present invention; Figure 2 This is an exploded view of a precision electric actuator for a control valve according to the present invention. Figure 3 This is a partial structural diagram of a precision electric actuator for a control valve according to the present invention. Figure 1 ; Figure 4 This is a partial structural diagram of a precision electric actuator for a control valve according to the present invention. Figure 2 ; Figure 5 This is a partial structural diagram of a precision electric actuator for a control valve according to the present invention. Figure 3 ; Figure 6 This is a partial structural diagram of a precision electric actuator for a control valve according to the present invention. Figure 4 ; Figure 7 This is a schematic diagram of the butterfly valve assembly structure of a precision electric actuator for a regulating valve according to the present invention; Figure 8 This is a schematic diagram of the connecting pipe assembly structure of a precision electric actuator for a regulating valve according to the present invention; Figure 9 This is a schematic diagram of the connecting sleeve structure of a precision electric actuator for a control valve according to the present invention. Figure 10This is a flowchart illustrating the adjustment method of the connecting sleeve for a precision electric actuator used in regulating valves according to the present invention.

[0020] The attached figures are labeled as follows: 100. Connecting pipe assembly; 101. Pipe body; 102. Connecting pipe; 103. Barrier post; 1031. V-shaped arc plate; 1032. Semi-circular arc plate; 200. Butterfly valve assembly; 201. Butterfly valve body; 202. First main shaft; 203. Second main shaft; 204. Limiter gear; 205. Motor gear; 206. Manual turntable; 207. Slide groove; 208. Inner groove; 209. Limiting block; 2091. Sliding part; 2092. Contact part; 300. Motor assembly; 301. Motor housing; 302. Motor; 303. Motor shaft; 400. Limit switch assembly; 401. Limit switch housing; 402. Limit switch; 403. Limit switch shaft; 404. Rotary switch; 405. Contactor; 500. Junction box; 600. Connecting sleeve; 601. Cylinder body; 602. Main shaft mounting hole; 603. Motor mounting hole; 604. Limiter mounting hole; 605. Junction box hole. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. Of course, the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0022] Although the steps in this invention are arranged by reference numerals, this is not intended to limit the order of the steps. Unless the order of the steps is explicitly stated or the execution of a step requires other steps as a basis, the relative order of the steps can be adjusted. It is understood that the term "and / or" as used herein refers to and covers any and all possible combinations of one or more of the associated listed items.

[0023] Example

[0024] like Figures 1-10As shown, a precision electric actuator for a regulating valve includes a connecting pipe assembly 100 and a butterfly valve assembly 200. The connecting pipe assembly 100 includes a pipe body 101, one side of which is fixedly connected to one end of a connecting pipe 102, and the other end of the connecting pipe 102 is fixedly connected to a blocking post 103. The butterfly valve assembly 200 includes a butterfly valve body 201, which is housed within the cavity of the pipe body 101. A first main valve is fixedly connected to the top of the butterfly valve body 201. One end of the first main shaft 202 is coaxially and fixedly connected to one end of the second main shaft 203. The first main shaft 202 is inserted into the connecting pipe 102. A blocking post 103 covers the outer wall of the second main shaft 203. The blocking post 103 is composed of a V-shaped arc plate 1031 and a semi-circular arc plate 1032. A sliding groove 207 is opened on the outer wall of the second main shaft 203 along the length direction of the second main shaft 203. A limiting block 209 is slidably connected in the sliding groove 207. A limiter gear 204 and a motor gear 205 are provided circumferentially on the outer wall of the second main shaft 203. The limiter gear 204 meshes with the gear of the limiter shaft 403 of the limiter assembly 400. The motor gear 205 meshes with the gear of the motor shaft 303 of the motor assembly 300. The motor 302 of the motor assembly 300 is electrically connected to the limiter 402 of the limiter assembly 400. The limit switch 402 is configured to receive a signal indicating the number of rotations of the limit switch shaft 403, and after the limit switch shaft 403 rotates to a set number of rotations, send a signal to the motor 302 to stop the rotation of the motor shaft 303.

[0025] In this invention, the regulating valve can be precisely maintained in the fully open state with the maximum opening. The blocking column 103 is composed of a V-shaped arc plate 1031 and a semi-circular arc plate 1032. A groove 207 is provided along the length direction on the second main shaft 203. The limiting block 209 is slidably connected in the groove 207. When the valve reaches the fully open state, the cross section of the butterfly valve body 201 is perpendicular to the cross section of the pipe body 101. The contact part 2092 of the limiting block 209 reaches the highest point of the arc edge of the V-shaped arc plate 1031, and its side abuts against the semi-circular arc plate 1032 to form a rigid mechanical stop. This stop provides a precise and repeatable positioning reference for the fully open state. No matter how many frequent operations are performed, the mechanical limit can lock the butterfly valve body 201 in the same maximum opening position, effectively eliminating excessive rotation angle and full-open position deviation caused by gear backlash, motor inertia or small fluctuations in control signals. This ensures that the flow capacity of the regulating valve in the fully open state is stable and reliable, meeting the precise requirements of the working conditions for the maximum flow rate.

[0026] In one embodiment, the V-shaped arc plate 1031 may have corresponding opening value scale lines engraved on its arc, see [reference]. Figure 6When operators need to maintain a specific flow rate value with the regulating valve, they need to precisely control the valve's opening value. They can directly observe the specific position of the limit block 209 at the second main shaft 203 of the regulating valve on the arc of the V-shaped arc plate 1031. At this time, the limit block 209 points to the corresponding opening value scale line on the V-shaped arc plate 1031. The opening degree of the butterfly valve body 201 at this time corresponds to the opening value scale line on the V-shaped arc plate 1031 that the limit block 209 points to. Turning the knob switch 404 in both directions can control the forward and reverse rotation of the motor 302. Operators can manually control the motor 302 to adjust the specific opening value and flow rate value of the regulating valve. When the knob switch 404 is in the stop position, the motor shaft 303, after stopping rotation, has anti-torsion operation, which can keep the rotation angle of the butterfly valve body 201 unchanged in the working state. Thus, operators can directly observe the regulating valve from the outside and manually operate the motor 302 to ensure that the regulating valve is adjusted to a specific opening state and maintain the specific flow rate required for a specific working condition.

[0027] Furthermore, the limiting block 209 contacts the arc edge of the V-shaped arc plate 1031, and the heights of the V-shaped arc plate 1031 and the slide groove 207 are both lower than the height of the semi-circular arc plate 1032.

[0028] Furthermore, the limiting block 209 includes a sliding part 2091 and a contact part 2092. The sliding part 2091 is placed in the slide groove 207, and the inner wall of the slide groove 207 is provided with an inner groove 208. The inner groove 208 is aligned with the length direction of the slide groove 207, and the sliding part 2091 is slidably connected in the inner groove 208. The contact part 2092 contacts the arc edge of the V-shaped arc plate 1031, and the arc edge of the V-shaped arc plate 1031 faces upward.

[0029] In this invention, high-precision control of the valve opening can be achieved. Through the meshing transmission between the limiter gear 204 and the limiter shaft 403, the rotational motion of the second main shaft 203 is synchronously transmitted to the limiter 402. During actual adjustment, the gear on the motor shaft 303 meshes with the motor gear 205, driving the second main shaft 203 to rotate. The second main shaft 203, through a coaxially fixed connection to the first main shaft 202, drives the butterfly valve body 201 to rotate within the inner cavity of the pipe body 101, changing the valve opening. Simultaneously, the limiter gear 204 on the second main shaft 203 rotates synchronously, driving the... The limit switch shaft 403 rotates, and the limit switch 402 receives the rotation number signal of the limit switch shaft 403 in real time. The rotation number of the limit switch 402 corresponds to the rotation angle of the butterfly valve body 201 and the valve opening value. During operation, the limit switch 402 continuously compares the current number of rotations with the preset target number of rotations. When the limit switch shaft 403 rotates to the set number of rotations, the valve reaches the target opening value. The contactor 405 immediately disconnects, the motor 302 is de-energized, and the motor shaft 303 stops rotating. Under the self-locking action of gear meshing, the butterfly valve body 201 is precisely positioned at the target opening value. This avoids the deflection error caused by factors such as temperature drift, power fluctuation, and mechanical wear of traditional electric actuators, improves the accuracy of repeatability, and achieves high-precision control of the valve opening.

[0030] Furthermore, a connecting sleeve 600 is fixedly installed on the second spindle 203. The connecting sleeve 600 includes a cylindrical body 601. Spindle mounting holes 602 are provided on both the upper and lower surfaces of the cylindrical body 601. The second spindle 203 passes through the two spindle mounting holes 602.

[0031] Furthermore, the limiter gear 204 and the motor gear 205 are located between the two main shaft mounting holes 602 in the cylinder 601.

[0032] Furthermore, the left and right sides of the cylinder 601 are respectively provided with a motor mounting hole 603 and a limiter mounting hole 604. The motor assembly 300 includes a motor housing 301, and the motor 302 is fixedly installed in the motor housing 301. The opening of the motor housing 301 is fixedly connected to the motor mounting hole 603, and the motor shaft 303 passes through the motor mounting hole 603. The limiter assembly 400 includes a limiter housing 401, and the limiter 402 is fixedly installed in the limiter housing 401. The opening of the limiter housing 401 is fixedly connected to the limiter mounting hole 604, and the limiter shaft 403 passes through the limiter mounting hole 604.

[0033] In this invention, both the limiter gear 204 and the motor gear 205 are located within the internal cavity of the cylinder 601, specifically between the two main shaft mounting holes 602. This encloses the two transmission gears within the cylinder 601, preventing the intrusion of external dust and debris, while simultaneously improving the smoothness and reliability of the transmission. The open end of the motor housing 301 of the motor assembly 300 is fixedly mounted on the motor mounting hole 603 via a flange or threaded connection, and the open end of the limiter housing 401 of the limiter assembly 400 is fixedly mounted on the limiter mounting hole 604 via a flange or threaded connection.

[0034] Furthermore, the limiter assembly 400 includes a contactor 405 and a rotary switch 404. The contactor 405 is fixedly connected to the side of the limiter 402 facing away from the limiter shaft 403 and is housed in the limiter housing 401. The rotary switch 404 is fixedly connected to the outer wall of the limiter housing 401. The rotary switch 404 is configured such that when the rotary switch 404 is rotated, the contactor 405 operates, providing power to the motor 302 to drive the motor shaft 303 to rotate.

[0035] In this invention, contactor 405 is fixedly connected to the side of limiter 402 facing away from limiter shaft 403, i.e., contactor 405 is located at the tail of limiter 402 and is also housed inside limiter housing 401. Rotary switch 404 is fixedly connected to the outer wall of limiter housing 401, with its operating end exposed for easy operation. Rotary switch 404 has three positions: forward, reverse, and stop. When rotary switch 404 is turned to forward or reverse, the coil of contactor 405 is energized, the main contacts of contactor 405 close, and external power supplies power to motor 302 through junction box 500, causing motor 302 to rotate in either direction. When rotary switch 404 is in the stop position, contactor 405 is disengaged, and motor 302 is de-energized and stops.

[0036] Furthermore, a junction box hole 605 is provided on the front side of the cylinder 601, and a junction box 500 is fixedly connected to the junction box hole 605. An external power cable connected in series with the motor 302 and the contactor 405 is connected in the junction box 500.

[0037] In this invention, a junction box hole 605 is provided on the front side of the cylinder 601, and a junction box 500 is fixedly connected to the junction box hole 605. The junction box 500 has a terminal block inside. After the external power cable and control cable are connected to the junction box 500, they are connected in series with the motor 302 and contactor 405 through internal wires. The cover plate of the junction box 500 is provided with a waterproof cable connector to ensure the sealing and safety of the electrical connection.

[0038] Furthermore, the butterfly valve assembly 200 includes a manual turntable 206, which is fixedly connected to the other end of the second spindle 203 away from the first spindle 202.

[0039] This invention improves the efficiency of on-site debugging, troubleshooting, and emergency operation. The contact part 2092 of the limit block 209 is located outside the blocking column 103 and is visible throughout. Simultaneously, the position of the contact part 2092 on the arc edge of the V-shaped arc plate 1031 corresponds one-to-one with the rotation angle of the butterfly valve body 201 enclosed inside the cylinder 601. When the contact part 2092 is at the lowest point of the arc edge, it corresponds to fully closed, with zero valve opening. When the contact part 2092 is at the highest point of the arc edge, it corresponds to fully open, with the maximum valve opening. The intermediate position corresponds to the intermediate opening. Operators can quickly and intuitively determine the current opening of the internal butterfly valve body 201 simply by visually observing the specific position of the contact part 2092 on the arc edge of the V-shaped arc plate 1031 without the need for any instruments or disassembly of any parts. Based on this, operators can rotate the manual turntable 206 while observing the positional changes of the contact part 2092, achieving precise manual adjustment while observing, which greatly improves the efficiency of on-site debugging, troubleshooting and emergency operation.

[0040] This invention also claims a method for regulating a valve using the aforementioned precision electric actuator, comprising the following steps: S101: When the cross section of the butterfly valve body 201 is parallel to the cross section of the pipe body 101, the valve is in the fully closed state with an opening value of zero. At this time, the contact part 2092 of the limit block 209 contacts the lowest point of the arc edge of the V-shaped arc plate 1031. S102: Twist the rotary switch 404, and the control signal is transmitted through the junction box 500 to the contactor 405 in the limit switch assembly 400. The contactor 405 is engaged, and the power cable supplies power to the motor 302. The motor 302 rotates forward, and the motor shaft 303 rotates. S103: The gear on the motor shaft 303 meshes with the motor gear 205, driving the second main shaft 203 to rotate. The second main shaft 203 drives the butterfly valve body 201 to rotate in the inner cavity of the pipe body 101 through the first main shaft 202 which is coaxially fixedly connected to the first main shaft 202, thereby changing the valve opening. S104: The limit gear 204 on the second main shaft 203 rotates synchronously, driving the limit shaft 403 meshing with it to rotate. The limit 402 receives the rotation number signal of the limit shaft 403 in real time. The rotation number of the limit 402 corresponds to the rotation angle of the butterfly valve body 201 and the valve opening value. S105: During operation, the limit switch 402 continuously compares the current number of revolutions with the preset target number of revolutions. When the limit switch shaft 403 rotates to the set number of revolutions, the valve reaches the target opening value. The contactor 405 immediately disconnects, the motor 302 is de-energized, the motor shaft 303 stops rotating, and under the self-locking action of gear meshing, the butterfly valve body 201 is precisely positioned at the target opening value. S105: When the contact part 2092 of the limit block 209 continues to rotate, it is pushed by the arc edge of the V-shaped arc plate 1031, which drives the sliding part 2091 to slide upward in the slide groove 207 until the contact part 2092 reaches the highest point of the arc edge of the V-shaped arc plate 1031. The cross section of the butterfly valve body 201 is perpendicular to the cross section of the pipe body 101, and the valve opening value is at its maximum. The side of the contact part 2092 abuts against the semi-circular arc plate 1032 to form a stop, preventing the main shaft from rotating excessively, so that the valve can accurately maintain the maximum opening value. S106: Reverse twisting of the rotary switch 404 activates the contactor 405, causing the motor 302 to reverse, which in turn rotates the second main shaft 203. Simultaneously, it drives the butterfly valve body 201 to rotate within the inner cavity of the pipe body 101 until the cross-section of the butterfly valve body 201 is parallel to the cross-section of the pipe body 101. The sliding part 2091 slides downward in the slide groove 207 to the lowest point of the arc edge of the V-shaped arc plate 1031, and the valve resets to the fully closed state.

[0041] The above description is only a preferred embodiment of the present invention. It should be noted that those skilled in the art can make several improvements and modifications without departing from the inventive concept of the present invention, and these all fall within the protection scope of the present invention.

Claims

1. A precision electric actuator for a control valve, characterized in that, The system includes a connecting pipe assembly (100) and a butterfly valve assembly (200). The connecting pipe assembly (100) includes a pipe body (101), one side of the outer wall of the pipe body (101) is fixedly connected to one end of a connecting pipe (102), and the other end of the connecting pipe (102) is fixedly connected to a blocking post (103). The butterfly valve assembly (200) includes a butterfly valve body (201), which is housed within the inner cavity of the pipe body (101). The top of the butterfly valve body (201) is fixedly connected to one end of a first main shaft (202). The other end of the shaft (202) is coaxially fixedly connected to one end of the second main shaft (203). The first main shaft (202) is inserted into the connecting pipe (102). The blocking column (103) covers the outer wall of the second main shaft (203). The blocking column (103) is composed of a V-shaped arc plate (1031) and a semi-circular arc plate (1032). The outer wall of the second main shaft (203) is provided with a sliding groove (207) along the length direction of the second main shaft (203). The limiting block (209) is slidably connected in the sliding groove (207). The outer wall of the second main shaft (203) is circumferentially provided with a limiter gear (204) and a motor gear (205). The limiter gear (204) meshes with the gear of the limiter shaft (403) of the limiter assembly (400). The motor gear (205) meshes with the gear of the motor shaft (303) of the motor assembly (300). The motor (302) of the motor assembly (300) is electrically connected to the limiter (402) of the limiter assembly (400). The limit switch (402) is configured to receive a signal indicating the number of rotations of the limit switch shaft (403), and after the limit switch shaft (403) rotates to the set number of rotations, it sends a signal to the motor (302) to stop the rotation of the motor shaft (303).

2. The precision electric actuator for a regulating valve according to claim 1, characterized in that, The limiting block (209) contacts the arc edge of the V-shaped arc plate (1031), and the heights of the V-shaped arc plate (1031) and the slide (207) are both lower than the height of the semi-circular arc plate (1032).

3. The precision electric actuator for a regulating valve according to claim 1, characterized in that, The limiting block (209) includes a sliding part (2091) and a contact part (2092). The sliding part (2091) is placed in the slide groove (207). The inner wall of the slide groove (207) is provided with an inner groove (208). The inner groove (208) is consistent with the length direction of the slide groove (207). The sliding part (2091) is slidably connected in the inner groove (208). The contact part (2092) contacts the arc edge of the V-shaped arc plate (1031), and the arc edge of the V-shaped arc plate (1031) opens upward.

4. The precision electric actuator for a regulating valve according to claim 1, characterized in that, A connecting sleeve (600) is fixedly installed on the second spindle (203). The connecting sleeve (600) includes a cylinder (601). Spindle mounting holes (602) are provided on both the upper and lower sides of the cylinder (601). The second spindle (203) passes through the two spindle mounting holes (602).

5. A precision electric actuator for a regulating valve according to claim 4, characterized in that, The limiter gear (204) and the motor gear (205) are located between the two main shaft mounting holes (602) in the cylinder (601).

6. A precision electric actuator for a regulating valve according to claim 4, characterized in that, The cylinder (601) has a motor mounting hole (603) and a limiter mounting hole (604) on its left and right sides, respectively. The motor assembly (300) includes a motor housing (301), and the motor (302) is fixedly installed in the motor housing (301). The opening of the motor housing (301) is fixedly connected to the motor mounting hole (603), and the motor shaft (303) passes through the motor mounting hole (603). The limiter assembly (400) includes a limiter housing (401), the limiter (402) is fixedly installed in the limiter housing (401), the opening of the limiter housing (401) is fixedly connected to the limiter mounting hole (604), and the limiter shaft (403) passes through the limiter mounting hole (604).

7. A precision electric actuator for a regulating valve according to claim 6, characterized in that, The limiter assembly (400) includes a contactor (405) and a rotary switch (404). The contactor (405) is fixedly connected to the side of the limiter (402) facing away from the limiter shaft (403). The contactor (405) is housed in the limiter housing (401). The rotary switch (404) is fixedly connected to the outer wall of the limiter housing (401). The rotary switch (404) is configured such that when the rotary switch (404) is rotated, the contactor (405) operates, providing power to the motor (302) to drive the motor shaft (303) to rotate.

8. A precision electric actuator for a regulating valve according to claim 7, characterized in that, The front of the cylinder (601) is provided with a junction box hole (605), and the junction box (500) is fixedly connected to the junction box hole (605). An external power cable connected in series with the motor (302) and the contactor (405) is connected in the junction box (500).

9. A precision electric actuator for a regulating valve according to claim 1, characterized in that, The butterfly valve assembly (200) includes a manual turntable (206) which is fixedly connected to the other end of the second spindle (203) away from the first spindle (202).

10. A method for regulating a control valve using a precision electric actuator as described in any one of claims 1 to 9, characterized in that, Includes the following steps: S101: When the cross section of the butterfly valve body (201) is parallel to the cross section of the pipe body (101), the valve is in the fully closed state with an opening value of zero. At this time, the contact part (2092) of the limit block (209) contacts the lowest point of the arc edge of the V-shaped arc plate (1031). S102: Twist the rotary switch (404), and the control signal is transmitted through the junction box (500) to the contactor (405) in the limit switch assembly (400). The contactor (405) is engaged, and the power cable supplies power to the motor (302). The motor (302) rotates forward, and the motor shaft (303) rotates. S103: The gear on the motor shaft (303) meshes with the motor gear (205) to drive the second main shaft (203) to rotate. The second main shaft (203) drives the butterfly valve body (201) to rotate in the inner cavity of the pipe body (101) through the first main shaft (202) which is coaxially fixedly connected, thereby changing the valve opening. S104: The limit gear (204) on the second main shaft (203) rotates synchronously, driving the limit shaft (403) meshing with it to rotate. The limit (402) receives the rotation number signal of the limit shaft (403) in real time. The rotation number of the limit (402) corresponds to the rotation angle of the butterfly valve body (201) and the valve opening value. S105: During operation, the limit switch (402) continuously compares the current number of revolutions with the preset target number of revolutions. When the limit switch shaft (403) rotates to the set number of revolutions, the valve reaches the target opening value, the contactor (405) immediately disconnects, the motor (302) is de-energized, the motor shaft (303) stops rotating, and under the self-locking action of gear meshing, the butterfly valve body (201) is precisely positioned at the target opening value. S105: When the second main shaft (203) continues to rotate, the contact part (2092) of the limit block (209) is pushed by the arc edge of the V-shaped arc plate (1031), which drives the sliding part (2091) to slide upward in the slide groove (207) until the contact part (2092) reaches the highest point of the arc edge of the V-shaped arc plate (1031). The cross section of the butterfly valve body (201) is perpendicular to the cross section of the pipe body (101), the valve opening value is at its maximum, and the side of the contact part (2092) abuts against the semi-circular arc plate (1032) to form a stop, preventing the main shaft from rotating excessively, so that the valve can accurately maintain the maximum opening value. S106: Twist the rotary switch (404) in the opposite direction, the contactor (405) engages, the motor (302) reverses, causing the second main shaft (203) to rotate, and at the same time drive the butterfly valve body (201) to rotate in the inner cavity of the pipe body (101) until the cross section of the butterfly valve body (201) is parallel to the cross section of the pipe body (101), the sliding part (2091) slides downward in the slide groove (207) to the lowest point of the arc edge of the V-shaped arc plate (1031), and the valve resets to the fully closed state.

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