Limit valve actuator

Abstract

The application discloses a limiting valve actuator, and relates to the technical field of fluid valves, which comprises an output shaft, the output shaft being rotatable and provided with a butt joint portion at one end for driving a valve, the opening and closing of the valve being controlled by the rotation of the output shaft; a driving source for driving the rotation of the output shaft; a transmission assembly, the driving source driving the transmission assembly to drive the rotation of the output shaft; and a triggering assembly comprising a first triggering switch and a triggering portion, the triggering portion being movable along with the rotation of the output shaft, the triggering portion being close to the first triggering switch and capable of triggering the first triggering switch when the output shaft rotates to a predetermined maximum angle, the driving source stopping the driving of the transmission assembly to limit the opening degree of the valve and prevent damage caused by the overstroke of the valve.

Description

Technical Field

[0001] This application relates to the field of fluid valves, and more particularly to a limit valve actuator. Background Technology

[0002] Valve actuators are widely used in petrochemical, energy and power, water treatment, and intelligent manufacturing fields. They are key components for the automation and intelligence of fluid control systems and are the "driving core" of valves. They are responsible for converting control signals into mechanical actions to realize the opening, closing, or regulation of valves, solving scenarios that are difficult to handle by manual operation, such as high-pressure pipeline valves, remote control valves, and high-frequency operation valves.

[0003] Existing valve actuators receive switching or regulating signals from the control system, convert electrical energy, pneumatic energy, etc. into mechanical energy through a drive device, and drive the valve stem or valve plate to move via a transmission mechanism, so as to control parameters such as flow rate, pressure, and temperature of pipeline fluid.

[0004] However, this method of valve control lacks a valve opening limit mechanism, and the valve may be damaged or destroyed due to overtravel during opening or closing. Utility Model Content

[0005] In order to reduce the risk of valve damage or injury due to overtravel during the opening or closing process when controlling the valve opening and closing via a valve actuator, this application provides a limit valve actuator that can realize valve opening feedback and electronic limit functions.

[0006] This application provides a limit valve actuator, which adopts the following technical solution: A limit valve actuator includes a housing, an output shaft, a drive source, a transmission assembly, and a trigger assembly. The output shaft is rotatable and has a valve-driving docking portion at one end; the drive source drives the output shaft to rotate; the drive source drives the transmission assembly to drive the output shaft to rotate; the trigger assembly includes a first trigger switch and a trigger part, the trigger part being movable following the rotation of the output shaft, and when the trigger part triggers the first trigger switch, the drive source stops driving the transmission assembly.

[0007] By adopting the above technical solution, the drive source provides power for the rotation of the output shaft. The output shaft is equipped with a docking part for driving the valve. The rotation of the output shaft controls the opening and closing of the valve. The triggering assembly includes a first trigger switch and a triggering part. When the output shaft rotates, it drives the triggering part to rotate. When the output shaft rotates to a predetermined maximum angle, the triggering part triggers the first trigger switch, thereby stopping the power transmission from the drive source and causing the output shaft to stop controlling the valve. This achieves the function of limiting the valve opening and preventing damage due to overtravel.

[0008] Preferably, there are two first trigger switches, and the triggering part is disposed between the two trigger switches. The output shaft can rotate forward and reverse. When the output shaft rotates forward, the triggering part can trigger one of the trigger switches. When the output shaft rotates in reverse, the triggering part can trigger the other trigger switch.

[0009] By adopting the above technical solution, two first trigger switches are provided, and the triggering part is located between the two trigger switches. When the output shaft rotates in the direction of opening the valve, the triggering part can trigger one of the first trigger switches; when the output shaft rotates in the direction of closing the valve, the triggering part can trigger the other first trigger switch, thereby stopping the power transmission of the drive source and thus stopping the output shaft from controlling the opening and closing of the valve.

[0010] Preferably, the triggering component further includes a second trigger switch, which can transmit the open and closed status information of the valve; there are two second trigger switches, which are configured corresponding to the first trigger switch, so that when the triggering part moves, the first trigger switch and the second trigger switch can be triggered simultaneously.

[0011] By adopting the above technical solution, the second trigger switch is set in correspondence with the first trigger switch. When the valve is opening, the second trigger switch is triggered to transmit the stop information that the valve is in the opening process. When the valve is closing, another second trigger switch is triggered to transmit the stop information that the valve is in the closing process. When the triggering part moves, the first trigger switch and the second trigger switch can be triggered at the same time to stop the valve from opening or closing, and to obtain whether the valve stops running during the opening process or the valve stops running during the closing process.

[0012] Preferably, the outer wall of the output shaft is provided with a mounting plate, and the trigger part is detachably connected to the mounting plate; one side of the trigger part is provided with an arc-shaped contact surface for closing the trigger switch.

[0013] By adopting the above technical solution, a mounting plate is provided on the outer wall of the output shaft, and the trigger part is detachably connected to the mounting plate, so that the mounting plate can move with the rotation of the output shaft. An arc-shaped contact surface is provided on one side of the trigger part for closing the trigger switch, which can reduce rigid damage to the trigger part, the first trigger switch and the second trigger switch, and make it easier to close the first trigger switch and the second trigger switch.

[0014] Preferably, the trigger part is slidably connected to the mounting plate around a circle centered on the output shaft axis, and the mounting plate is provided with a fixing member for fixing the trigger part.

[0015] By adopting the above technical solution, the trigger part can be well fixed on the mounting plate, and the trigger part is slidably connected to the mounting plate around the circumference with the output shaft axis as the center. The position of the trigger part can be adjusted, and the valve opening can be increased or decreased, so that the valve opening can be adjusted according to the demand.

[0016] Preferably, it further includes a housing, which includes a detachably connected first housing and a second housing, and the drive source, transmission assembly, and trigger assembly are disposed within the housing; the docking portion penetrates the second housing for connection with the valve; and / or the second housing is provided with a connection hole for integral fixed connection with the valve.

[0017] By adopting the above technical solution, the housing includes a detachably connected first housing and a second housing, which serves to protect the internal structure while also facilitating disassembly. A connecting portion penetrates the second housing for connection with the valve. Furthermore, the second housing is provided with a connection hole for integral fixation with the valve, enabling better control over the valve's opening and closing.

[0018] Preferably, it further includes a display component, the display component including a scale coaxially disposed with the output shaft, a visible end cover covering the scale on the first housing, and a scale indicator on the visible end cover.

[0019] By adopting the above technical solution, when the output shaft rotates to open or close the valve, the dial can rotate with the output shaft. The operator can intuitively see the change in the relationship between the dial and the scale position, and can obtain the valve opening status according to the scale indicator.

[0020] Preferably, it further includes a manual control mechanism; the transmission assembly includes a third transmission gear, and the manual control mechanism includes an operating shaft coaxial with the third transmission gear, the operating shaft being used to drive the third transmission gear to rotate.

[0021] By adopting the above technical solution, the manual control mechanism includes an operating shaft coaxial with the third transmission gear. The operating shaft is used to drive the third transmission gear to rotate. The rotation of the operating shaft can be controlled at any time by using tools to control the opening of the valve. When the power supply or motor fails, the opening of the valve can be controlled manually.

[0022] Preferably, the third transmission gear further includes a transmission shaft fixed coaxially; The operating shaft is rotatably connected to the first housing. The operating shaft can be sleeved outside the transmission shaft. When the operating shaft is sleeved outside the transmission shaft and rotates, it can drive the transmission shaft to rotate.

[0023] By adopting the above technical solution, the transmission shaft can only be driven to rotate when the operating shaft is sleeved outside the transmission shaft and rotates, which can realize the idling of the operating shaft and prevent others from arbitrarily controlling the opening of the valve.

[0024] Preferably, an elastic element is provided between the operating shaft and the third transmission gear, the elastic element being used to apply force to the operating shaft so as to separate the operating shaft and the transmission shaft.

[0025] By adopting the above technical solution, the elastic element can separate the operating shaft and the transmission shaft, causing the operating shaft to lose its control over the transmission shaft, reducing misoperation, and providing a certain degree of protection.

[0026] In summary, this application includes at least one of the following beneficial technical effects: 1. During the automatic control of valve opening and closing, when the set valve opening range is exceeded, the motor power output can be stopped, thus protecting the valve from overtravel during opening or closing. 2. The traditional manual control function is retained. If there is a problem with the power supply or other situations that require manual control during use, manual control can be performed. 3. The manual control mechanism is designed to separate the operating shaft and the transmission shaft, so that the manual control mechanism cannot be easily opened when manual operation is not used, thus providing a protective function; 4. The design of the display component allows for a clear view of the valve opening information, and even when the power is off and the smart device cannot display anything, the display component can still provide an intuitive display. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application; Figure 2 This is a partial schematic diagram showing the overall internal structure of the housing in an embodiment of this application; Figure 3 This is a partially enlarged schematic diagram illustrating the structure of the trigger component and the display component in this embodiment; Figure 4 This is an exploded structural diagram of the shell in an embodiment of this application; Figure 5 This is a schematic cross-sectional view of the structure cut along the output shaft axis in an embodiment of this application; Figure 6 This is a cross-sectional structural schematic diagram of the manual control mechanism in the embodiments of this application; Figure 7 This is a schematic diagram illustrating the internal structure of the housing according to an embodiment of this application; Figure 8This is a partial schematic diagram of the internal structure of the housing from another angle, as shown in an embodiment of this application.

[0028] Explanation of reference numerals in the attached figures: 1. Output shaft; 10. PCB board; 11. Trigger section; 111. First snap-fit ​​plate; 112. Second snap-fit ​​plate; 12. First trigger switch; 121. Trigger protrusion; 13. Second trigger switch; 14. Mounting plate; 141. Arc-shaped hole; 142. Waist-shaped hole; 15. Connecting part; 151. First polygonal groove; 2. Manual control mechanism; 20. Drive shaft; 21. Operating shaft; 22. Second polygonal groove; 23. Third polygonal groove; 24. Elastic element; 25. Collar ring; 3. Drive source; 41 41. First transmission gear; 42. Second transmission gear; 43. Third transmission gear; 44. Reduction gear set; 441. First reduction gear; 442. Second reduction gear; 443. Third reduction gear; 444. Fourth reduction gear; 445. Fifth reduction gear; 5. Receiving plate; 6. Display component; 61. Visible end cover; 611. Flange; 62. Dial; 7. Housing; 71. First housing; 711. Snap-fit ​​groove; 712. First clearance hole; 72. Second housing; 721. Connecting hole; 8. Cable conduit. Detailed Implementation

[0029] The following is in conjunction with the appendix Figure 1-8 This application will be described in further detail below.

[0030] This application discloses a limit valve actuator.

[0031] Reference Figure 1 and Figure 2 The limit valve actuator includes a housing 7, and an output shaft 1, a drive source 3, a transmission assembly, and a trigger assembly located inside the housing 7. The output shaft 1 is rotatably connected to the housing 7, and the output shaft 1 can rotate clockwise or counterclockwise around its own axis. One end of the output shaft 1 is provided with a docking part 15 for driving the valve to open or close. A first polygonal groove 151 is formed on the side of one end of the docking part 15. The first polygonal groove 151 can engage with the valve switch. Rotating the output shaft 1 can drive the valve switch to rotate, thereby controlling the valve opening degree.

[0032] When the output shaft 1 rotates counterclockwise, the valve opening can be increased; when the output shaft 1 rotates clockwise, the valve opening can be decreased.

[0033] The drive source 3 can provide power to the transmission component, thereby enabling the transmission component to transmit power to the output shaft 1, causing the output shaft 1 to rotate clockwise or counterclockwise.

[0034] Reference Figure 2 and Figure 3The triggering component includes a first trigger switch 12 and a triggering part 11. The triggering part 11 can move with the rotation of the output shaft 1, thereby triggering the first trigger switch 12. When the triggering part 11 triggers the first trigger switch 12, the drive source 3 stops driving the transmission component, and the output shaft 1 stops rotating. The docking part 15 also stops driving the valve to rotate, and the valve stops opening or closing.

[0035] Reference Figure 2 and Figure 4 The housing 7 includes a first housing 71 and a second housing 72, which are detachably connected. The drive source 3, transmission assembly, and trigger assembly are disposed within the housing 7. The housing 7 effectively protects the internal components and can be disassembled for maintenance. The second housing 72 is provided with a connection hole 721 for fixed connection with the valve assembly. The first housing 71 and the second housing 72 are specifically connected by bolts.

[0036] Reference Figure 2 and Figure 3 The limit valve actuator also includes a PCB board 10 (printed circuit board) fixed inside the housing 7. The PCB board 10 is electrically connected to an external power source, and a logic control unit (not shown in the attached figure) is integrated on the PCB board 10. A first trigger switch 12 is disposed on the PCB board 10. When the triggering part 11 triggers the first trigger switch 12, the first trigger switch 12 closes. The logic control unit receives the signal from the first trigger switch 12 and cuts off the power supply to the drive source 3 or sends a stop signal to the drive source 3 so that the drive source 3 stops running. The drive source 3 stops driving the transmission component, the output shaft 1 stops rotating, and at the same time stops driving the valve to rotate.

[0037] Reference Figure 2 and Figure 3 Two first trigger switches 12 are provided. The output shaft 1 passes through the PCB board 10, and the two first trigger switches 12 are arranged on the circumference of the PCB board 10 with the same center as the output shaft 1, and are located on both sides of the output shaft 1. The first trigger switches 12 are electrically connected to the PCB board 10.

[0038] The triggering part 11 is disposed between the two first trigger switches 12, that is, when the output shaft 1 rotates clockwise and counterclockwise, the triggering part 11 can trigger the first trigger switches 12.

[0039] When the output shaft 1 rotates forward, the triggering part 11 can trigger the first trigger switch 12. When the output shaft 1 rotates in reverse, the triggering part 11 can trigger another first trigger switch 12, thereby stopping the opening or closing action of the valve.

[0040] The triggering component also includes a second trigger switch 13, which can transmit the open and closed status information of the valve. There are also two second trigger switches 13, which are arranged adjacent to the first trigger switch 12. When the triggering part 11 triggers the first trigger switch 12, the triggering part 11 can simultaneously trigger the second trigger switch 13.

[0041] The first trigger switch 12 and the second trigger switch 13 are specifically disposed on the PCB board 10 on both sides of the output shaft 1. Specifically, one first trigger switch 12 and one second trigger switch 13 are installed on one side of the output shaft 1, and the same is true for the other side.

[0042] A mounting plate 14 is provided on the outer wall of the output shaft 1 away from the docking part 15. The mounting plate 14 is specifically circular. The trigger part 11 is detachably connected to the mounting plate 14. The height of the side of the trigger part 11 near the first trigger switch 12 is the same as the height of the first trigger switch 12. The trigger part 11 is provided with an arc-shaped contact surface for closing the first trigger switch 12 and the second trigger switch 13. Both the first trigger switch 12 and the second trigger switch 13 are provided with trigger protrusions 121. The height of the first trigger switch 12 and the second trigger switch 13 is the same as the height of the trigger part 11 from the PCB board 10. When the trigger part 11 moves above the first trigger switch 12 and the second trigger switch 13, it can press the trigger protrusions 121 to close the first trigger switch 12 and the second trigger switch 13.

[0043] When the trigger part 11 moves to the position of the first trigger switch 12, the arc-shaped contact surface can better contact the trigger protrusion 121 of the first trigger switch 12 and the second trigger switch 13, and can press the trigger protrusion 121 to trigger the first trigger switch 12 and the second trigger switch 13.

[0044] When both second trigger switches 13 are triggered, the logic control unit receives different signals. When one of the second trigger switches 13 is triggered, the transmitted signal indicates that the valve is in the open state and has stopped; when the other second trigger switch 13 is triggered, the transmitted signal indicates that the valve is in the closed state and has stopped. refer to Figure 2 and Figure 3The mounting plate 14 has an arc-shaped hole 141, and the trigger part 11 has a locking plate on both sides away from and near the output shaft 1. Specifically, the mounting plate 14 is generally a circular plate coaxial with the output shaft 1. The mounting plate 14 has an arc-shaped hole 141 coaxial with the output shaft 1. The trigger part 11 has an arc-shaped first locking plate 111 and a second locking plate 112 on both sides. The first locking plate 111 is inserted into the arc-shaped hole 141 and can move along the arc-shaped hole 141. The second locking plate 112 abuts against the side wall of the mounting plate 14. The first locking plate 111 and the second locking plate 112 form a sliding groove for part of the mounting plate to slide.

[0045] The first snap-fit ​​plate 111 on the side of the trigger part 11 near the output shaft 1 has a snap-fit ​​groove 711 that snaps into the arc-shaped hole 141. The second snap-fit ​​plate 112 on the side of the trigger part 11 away from the output shaft 1 also has a snap-fit ​​groove 711 that snaps into the edge of the mounting plate 14 (not shown in the figure). The trigger part 11 is slidably connected to the mounting plate 14 in a snap-fit ​​manner.

[0046] When adjustment is needed, the valve opening can be limited by sliding the trigger part 11.

[0047] In this embodiment, two trigger parts 11 are provided. The mounting plate 14 also has two oblong holes 142. The trigger parts 11 can be fixed to the mounting plate 14 using fasteners (not shown in the attached drawings) through the two oblong holes 142. Specifically, the fasteners can be bolts threaded to the trigger parts 11. The bolt nuts can press against the mounting plate 14, thereby fixing the mounting plate 14 and the trigger parts 11. During use, the position of the trigger parts 11 can be adjusted by removing the bolts and then fixed again with the bolts. This allows for adjustment of the trigger part 11's position while preventing the trigger parts 11 from sliding relative to the mounting plate 14 during equipment operation.

[0048] Using two trigger units 11 also allows for a more precise setting of the valve opening limit range.

[0049] Reference Figure 2 The transmission assembly includes a first transmission gear 41 and a second transmission gear 42. The first transmission gear 41 is coaxially fixed to one end of the output shaft 1. The second transmission gear 42 is coaxially fixed to the rotating shaft of the drive source 3. The drive source 3 is specifically a motor. The second transmission gear 42 rotates coaxially with the motor output shaft 1 (not shown in the attached figure).

[0050] Reference Figure 1 and Figure 5 The transmission assembly also includes a reduction gear set 44. The drive source 3 drives the reduction gear set 44 through the second transmission gear 42. The reduction gear set 44 drives the first transmission gear 41, which enables the output shaft 1 to rotate, thereby driving the valve to open or close.

[0051] Reference Figure 1 and Figure 2 The limit valve actuator also includes a display component 6, which includes a dial 62 coaxially arranged with the output shaft 1. The dial 62 is fixed on the side of the mounting plate 14 away from the PCB board 10. A visible end cap 61 covering the dial 62 is provided on the first housing 71, and two flanges 611 are provided on the edge of the dial 62.

[0052] The first housing 71 has a first clearance hole 712 on one side and two snap-fit ​​grooves 711 inside. The visible end cap 61 protrudes from the first clearance hole 712, and the flange 611 is correspondingly snapped into the snap-fit ​​grooves 711. The visible end cap 61 is provided with a scale indicator (not shown in the figure).

[0053] The visible end cap 61 and the dial 62 are specifically hemispherical, and the visible end cap 61 is slightly larger than the dial 62. Under normal conditions, the visible end cap 61 and the dial 62 can be seen from the outside of the whole.

[0054] When the output shaft 1 rotates, the dial 62 rotates accordingly and relative to the scale indicator. The valve opening information can be obtained based on the value indicated on the dial 62 by the scale indicator.

[0055] Reference Figure 1 , Figure 2 and Figure 5 The limit valve actuator also includes a manual control mechanism 2, and the transmission assembly includes a third transmission gear 43, which is fixedly mounted on the manual control mechanism 2. It should be noted that the drive source 3 in this application is a common motor without a self-locking function. When the drive source stops running, the manual control mechanism 2 can be used to control the rotation of the output shaft 1.

[0056] The manual control mechanism 2 includes an operating shaft 21 coaxial with the third transmission gear 43. The operating shaft 21 is rotatably connected to the first housing 71. When the operating shaft 21 is rotated clockwise or counterclockwise, the operating shaft 21 drives the third transmission gear 43 to rotate. Through the transmission of the transmission component, the power is transmitted to the first transmission gear 41. The first transmission gear 41 drives the output shaft 1 to rotate, thereby controlling the opening degree of the valve.

[0057] In this embodiment, the third transmission gear 43 further includes a coaxially fixed transmission shaft 20. The end of the transmission shaft 20 away from the operating shaft 21 is in the shape of a polygonal column. The end of the operating shaft 21 near the third transmission shaft 20 has a second polygonal groove 22 inside. The operating shaft 21 can be sleeved on the outside of the transmission shaft 20. When the operating shaft 21 is sleeved on the outside of the transmission shaft 20 and rotates, it can drive the transmission shaft 20 to rotate.

[0058] An elastic element 24 is provided between the operating shaft 21 and the third transmission gear 43, and is sleeved on the transmission shaft 20. The radius of the operating shaft 21 at the end closer to the transmission shaft 20 is smaller than the radius of the operating shaft 21 at the end farther from the transmission shaft 20. A sleeve ring 25 is fixedly sleeved on the end of the transmission shaft 20 away from the elastic element 24, and the radius of the sleeve ring 25 is larger than the radius of the elastic element 24.

[0059] The elastic element 24 is specifically a spring. Under normal conditions, the elastic element 24 applies a spring force to the operating shaft 21 and the transmission shaft 20 to separate the operating shaft 21 and the transmission shaft 20.

[0060] The operating shaft 21 has a third polygonal groove 23 on its side away from the transmission shaft 20. When the valve needs to be manually controlled, the tool is inserted into the third polygonal groove 23, and the operating shaft 21 is pressed. The elastic element 24 is compressed, so that the operating shaft 21 is sleeved on the transmission shaft 20. When the operating shaft 21 is rotated, it can drive the third transmission gear 43 to rotate and provide power.

[0061] Reference Figure 2 , Figure 6 and Figure 7 The limit valve actuator also includes a receiving plate 5, which is arranged parallel to the PCB board 10 and is used to receive the transmission components. The output shaft 1 and the manual control mechanism 2 pass through the PCB board 10 and the receiving plate 5.

[0062] The transmission assembly also includes a reduction gear set 44, which includes five sets of the same or different reduction gears disposed on the receiving plate 5, and are named as follows: first reduction gear 441, second reduction gear 442, third reduction gear 443, fourth reduction gear 444 and fifth reduction gear 445, which will be referred to as "reduction gears" below.

[0063] The first reduction gear 441, the second reduction gear 442, the third reduction gear 443, and the fourth reduction gear 444 are disposed on the side of the receiving plate 5 close to the PCB board 10, and the fifth reduction gear 445 is disposed on the side of the receiving plate 5 away from the PCB board 10.

[0064] Each of the five reduction gears includes a large gear and a small gear, and the large gear and small gear of each reduction gear are coaxially arranged and fixedly connected. The distinction between the large gear and the small gear mentioned above is only based on their size; their relative shape and size may or may not be the same across different reduction gears.

[0065] The transmission assembly achieves power transmission through a first transmission gear 41, a second transmission gear 42, a third transmission gear 43, and a reduction gear set 44. Specifically: The second transmission gear 42 on the drive source 3 meshes with the large gear of the fourth reduction gear 444; the small gear of the fourth reduction gear 444 meshes with the large gear of the third reduction gear 443; the small gear of the third reduction gear 443 meshes with the large gear of the second reduction gear 442; the small gear of the second reduction gear 442 meshes with the large gear of the first reduction gear 441. The pinion of the first reduction gear 441 meshes with the third transmission gear 43 of the manual control mechanism 2. The third transmission gear 43 also includes a large gear and a small gear; specifically, the pinion of the first transmission gear 41 meshes with the large gear of the third transmission gear 43. The pinion of the third transmission gear 43 passes through the receiving plate 5 and meshes with the large gear of the fifth transmission gear. The pinion of the fifth transmission gear meshes with the first transmission gear 41.

[0066] When the drive source 3 is running, the second transmission gear 42 and the large gear of the fourth transmission gear transmit power, which in turn drives the third transmission gear 43, the second transmission gear 42, the first transmission gear 41, the second transmission gear 42 and the fifth reduction gear 445 in sequence, thereby driving the docking part 15 to rotate. Through the multi-stage transmission effect of the transmission components, the opening degree of the valve can be controlled better and more precisely.

[0067] When the manual control mechanism 2 is rotated, the pinion of the third transmission gear 43 drives the fifth reduction gear 445, which in turn drives the first transmission gear 41 to control the opening of the valve.

[0068] Reference Figure 1 and Figure 2 In this embodiment, a cable conduit 8 is also provided. The second housing 72 has a second clearance hole (not shown in the figure). The cable conduit 8 is installed in the second clearance hole. The cable conduit 8 is used to place the cable, protect the cable from corrosion, and extend the service life of the cable.

[0069] The implementation principle of a limit valve actuator according to an embodiment of this application is as follows: When the automatic control valve opens or closes, the drive source 3 rotates, which drives the transmission component and then drives the output shaft 1 to rotate. The output shaft 1 is connected to the valve and can drive the valve to open or close.

[0070] When manually controlling the valve to open or close, first press the operating shaft 21 to compress the elastic element 24, so that the operating shaft 21 is sleeved on the transmission shaft 20, and then rotate the operating shaft 21 to control the valve opening.

[0071] In the event of a power failure or other malfunction, the valve opening can be viewed via display component 6.

[0072] When the valve rotates to the set limit position, the trigger unit 11 closes the first trigger switch 12 and the second trigger switch 13. When the first trigger switch 12 is closed, the drive source 3 stops operating. The closure of the second trigger switch 13 provides feedback on whether the valve is in the open or closed state at this time.

[0073] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A limit valve actuator, characterized in that: include Output shaft (1), which is rotatable and has a docking part (15) for driving the valve at one end. A drive source (3) is used to drive the output shaft (1) to rotate; The transmission assembly, wherein the drive source (3) drives the transmission assembly to drive the output shaft (1) to rotate; The triggering component includes a first trigger switch (12) and a trigger part (11). The trigger part (11) can move with the rotation of the output shaft (1). When the trigger part (11) triggers the first trigger switch (12), the drive source (3) stops driving the transmission component.

2. The limit valve actuator according to claim 1, characterized in that: There are two first trigger switches (12), and the trigger part (11) is located between the two first trigger switches (12). The output shaft (1) can rotate forward and reverse. When the output shaft (1) rotates forward, the trigger part (11) can trigger one of the first trigger switches (12). When the output shaft (1) rotates in reverse, the trigger part (11) can trigger the other first trigger switch (12).

3. The limit valve actuator according to claim 2, characterized in that: The triggering component also includes a second trigger switch (13), which can be used to transmit valve opening and closing status information; There are two second trigger switches (13), which are configured to correspond to the first trigger switch (12). When the trigger part (11) moves, the first trigger switch (12) and the second trigger switch (13) can be triggered simultaneously.

4. A limit valve actuator according to claim 3, characterized in that: The outer wall of the output shaft (1) is provided with a mounting plate (14), and the trigger part (11) is detachably connected to the mounting plate (14); one side of the trigger part (11) is provided with an arc-shaped contact surface for closing the first trigger switch (12) and the second trigger switch (13).

5. A limit valve actuator according to claim 4, characterized in that: The trigger part (11) is slidably connected to the mounting plate (14) around the circumference of the output shaft (1) axis. The mounting plate (14) is provided with a fixing member for fixing the trigger part (11).

6. A limit valve actuator according to claim 1, characterized in that: It also includes a housing (7), which includes a first housing (71) and a second housing (72) that are detachably connected, and the drive source (3), transmission assembly and trigger assembly are disposed inside the housing (7); The docking part (15) penetrates the second housing (72) and is used to connect with the valve; And / or the second housing (72) is provided with a connection hole (721).

7. A limit valve actuator according to claim 6, characterized in that: It also includes a display component (6), which includes a dial (62) that rotates coaxially with the output shaft (1). The housing (7) is provided with a visible end cap (61) covering the dial (62), and the visible end cap (61) is provided with a scale indicator.

8. A limit valve actuator according to claim 6, characterized in that: It also includes a manual control mechanism (2); The transmission assembly includes a third transmission gear (43), and the manual control mechanism (2) includes an operating shaft (21) coaxial with the third transmission gear (43), the operating shaft (21) being used to drive the third transmission gear (43) to rotate.

9. A limit valve actuator according to claim 8, characterized in that: The third transmission gear (43) also includes a transmission shaft (20) fixed coaxially. The operating shaft (21) is rotatably connected to the first housing (71). The operating shaft (21) can be sleeved outside the transmission shaft (20). When the operating shaft (21) is sleeved outside the transmission shaft (20) and rotates, it can drive the transmission shaft (20) to rotate.

10. A limit valve actuator according to claim 9, characterized in that: An elastic element (24) is provided between the operating shaft (21) and the third transmission gear (43). The elastic element (24) is used to apply force to the operating shaft (21) so that the operating shaft (21) and the transmission shaft (20) are separated.

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