Spring reset electric actuator with manual operation structure

Abstract

The utility model relates to the technical field of electric actuating mechanisms, in particular to a spring reset electric actuator with a manual operation structure, which comprises an actuator body, the actuator body comprises a central shaft and an elastic piece which are positioned in the actuator body, the central shaft is rotatably connected with the actuator body, and the elastic piece is connected with the central shaft. One end of the elastic piece is fixedly connected with the actuator body, the other end of the elastic piece is fixedly connected with the center shaft, the actuator body is provided with a base rotationally connected with the actuator body, a transmission assembly in transmission connection with the base and a hand wheel arranged on the transmission assembly, and the center shaft and the elastic piece are fixedly connected to the base. The hand wheel drives the base to rotate through the transmission assembly. According to the spring reset electric actuator, the valve can be rapidly and accurately controlled in emergency through manual operation, normal operation or safe closing of equipment is ensured, and the operation flexibility of the spring reset electric actuator is improved.

Description

Technical Field

[0001] This application relates to the technical field of electric actuators, and in particular to a spring-reset electric actuator with a manual operation structure. Background Technology

[0002] The basic principle of a spring-reset electric actuator is to use an actuator mechanism with a helical spring device. In the event of an unexpected power failure or emergency stop, the electric actuator can be reset by the pre-compressed spring, ensuring that the system can quickly restart according to a pre-set state. Specifically, the spring-reset electric actuator mounts the helical spring at the lower end of the moving actuator. A coupling on the actuator axially connects the motor and the actuator mechanism with the spring assembly, thereby achieving stability and reliability of the control system.

[0003] The work process can be divided into the following steps:

[0004] Energy storage stage: The electric motor stores energy in the helical compression spring through the reduction gear and maintains this state.

[0005] Release phase: When an operation is required, the motor drives the actuator to move, while the locking system retains the energy of the spring.

[0006] Reset Phase: In the event of an unexpected power outage or emergency shutdown, the pre-compressed spring releases energy through the mechanical transmission unit, resetting the actuator to its preset state.

[0007] The actuator is entirely electrically driven to open and close the valve. If a power failure causes the actuator to be reset by the spring, the actuator will be unable to quickly control the opening and closing of the valve again, which will lead to the equipment failing to operate normally or shut down safely, thus affecting the safety performance of the system.

[0008] Therefore, a spring-reset electric actuator with a manually operated structure is needed to solve the above problems. Utility Model Content

[0009] In order to enable the actuator to be quickly controlled to open and close the valve again after the actuator is reset in the emergency of power failure, so that the equipment can continue to operate normally or be safely shut down, this application provides a spring-reset electric actuator with a manual operation structure.

[0010] This application provides a spring-reset electric actuator with a manual operation structure, which adopts the following technical solution:

[0011] A spring-reset electric actuator with a manually operated structure includes an actuator body. The actuator body includes a central shaft and an elastic element located within the actuator body. The central shaft is rotatably connected to the actuator body. One end of the elastic element is fixedly connected to the actuator body, and the other end is fixedly connected to the central shaft. The actuator body is provided with a base rotatably connected to the actuator body, a transmission assembly pulverizedly connected to the base, and a handwheel disposed on the transmission assembly. The central shaft is fixedly connected to the elastic element on the base, and the handwheel drives the base to rotate through the transmission assembly.

[0012] By adopting the above technical solution, the base is rotated by turning the handwheel. The rotation of the base drives the central shaft to rotate and the elastic element to be wound and compressed, thereby realizing the control of valve opening and closing. Compared with the prior art, manual operation can quickly and accurately control the valve and the winding and compression of the elastic element in emergency situations, storing elastic potential energy for easy release of potential energy in the next actuator operation. This application ensures the normal operation or safe shutdown of the equipment and improves the flexibility of spring reset electric actuator operation.

[0013] Optionally, the transmission structure includes an output shaft assembly, a worm gear and a worm shaft that are engaged in transmission, wherein the worm gear abuts against the output shaft assembly and drives the output shaft assembly to rotate.

[0014] By adopting the above technical solution, the rotational motion of the handwheel is transmitted to the output shaft assembly using a worm gear, thereby driving the output shaft assembly to rotate. Due to the high transmission ratio of the worm gear, the transmission accuracy is high, which is conducive to achieving precise control of valve opening and closing and ensuring the smoothness of motion transmission. At the same time, the self-locking performance of the worm gear improves the reliability of the handwheel transmitting motion to the output shaft assembly.

[0015] Optionally, the worm gear has an inner hole for accommodating the output shaft assembly, the inner sidewall of the inner hole protrudes to form a first abutment, and the outer sidewall of the output shaft assembly protrudes to form a second abutment, the first abutment abutting against the second abutment after the worm gear rotates.

[0016] By adopting the above technical solution, the first contacting member and the second contacting member abut against each other, so that the worm gear drives the output shaft assembly to rotate, and the worm gear can effectively transmit power to the output shaft assembly when rotating.

[0017] Optionally, the first contact member and the second contact member are respectively provided with mating surfaces that fit together.

[0018] By adopting the above technical solution, the contact surfaces on the first and second contact components ensure a good contact effect when they come into contact. Enhancing the contact effect can improve the power transmission efficiency and stability between the worm gear and the output shaft assembly, while reducing wear between the first and second contact components and improving the stability of the transmission process.

[0019] Optionally, the output shaft assembly includes a main shaft and a protective sleeve fixedly fitted on the main shaft, with the second abutment located outside the protective sleeve.

[0020] By adopting the above technical solution, the protective bushing is fixedly fitted on the main shaft, which improves the strength and stability of the main shaft, prevents the main shaft from deforming during long-term use, and ensures that the worm gear can effectively drive the main shaft to rotate when it rotates.

[0021] Optionally, the main shaft and the protective bushing are fixed together by a key.

[0022] By adopting the above technical solution, the key connection fixation can ensure the stability of the connection between the spindle and the protective bushing, prevent relative displacement during transmission, and thus ensure the reliability and stability of the transmission process.

[0023] Optionally, the transmission assembly further includes a driven wheel fixedly connected to the worm gear and a driving wheel meshing with the driven wheel, wherein the driving wheel is coaxially fixed with the handwheel.

[0024] By adopting the above technical solution, the drive wheel and the handwheel are fixed coaxially, so that the rotation of the handwheel drives the drive wheel to rotate, which in turn drives the driven wheel and the worm to rotate synchronously, thus improving the efficiency of manual operation.

[0025] Optionally, the base has a through hole, the inner wall of the through hole protrudes to form a limit key, and the outer side of the central shaft is recessed to form a limit groove that is interference-fitted with the limit key.

[0026] By adopting the above technical solution, the limit key and the limit groove are interference-fitted, realizing the fixed connection between the central shaft and the base. This allows the base to effectively drive the central shaft to rotate when it rotates. One end of the central shaft extends into the through hole, which enhances the connection strength between the central shaft and the base and improves the stability of the overall structure.

[0027] Optionally, the actuator body has a mounting cavity for mounting a worm gear, a protruding ring is formed on the worm gear, and a self-rotating bearing with an inner ring fixedly connected to the protruding ring is fixedly mounted on the side wall of the mounting cavity.

[0028] By adopting the above technical solution, the convex ring is fixedly connected to the inner ring of the self-rotating bearing, ensuring that the worm gear can rotate stably within the actuator body. This facilitates the worm gear to better transmit power to the output shaft assembly, thereby improving the stability of the entire transmission process.

[0029] In summary, this application includes at least one of the following beneficial technical effects:

[0030] 1. Rotating the handwheel controls the base rotation, which in turn drives the central shaft to rotate and winds and compresses the elastic element, thereby controlling the opening and closing of the valve. Compared with existing technologies, manual operation allows for quick and precise valve control in emergencies, ensuring the normal operation or safe closure of the equipment and improving the flexibility of the spring-reset electric actuator.

[0031] 2. The worm gear is used to transmit the rotational motion of the handwheel to the output shaft assembly, thereby driving the output shaft assembly to rotate, achieving precise control of the valve opening and closing, ensuring the smoothness of motion transmission, and at the same time, the self-locking performance of the worm gear is used to improve the reliability of the handwheel transmitting motion to the output shaft assembly;

[0032] 3. The limit key and the limit groove are interference-fitted to achieve a fixed connection between the central shaft and the base, so that the base can effectively drive the central shaft to rotate when it rotates. One end of the central shaft extends into the through hole, which enhances the connection strength between the central shaft and the base and improves the stability of the overall structure. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the structure of an embodiment of this application;

[0034] Figure 2 This is a partial cross-sectional view of an embodiment of this application, used to illustrate the structure within the actuator body;

[0035] Figure 3 This is a partial cross-section of an embodiment of this application. Figure 1 This is used to demonstrate the positional relationship between the handwheel and the transmission components;

[0036] Figure 4 This is a partial cross-section of an embodiment of this application. Figure 2 This is used to show the positional relationship between the handwheel and the transmission components from another perspective.

[0037] Reference numerals: 1. Central shaft; 2. Spring; 3. Base; 4. Transmission assembly; 5. Handwheel; 6. Drive wheel; 7. Driven wheel; 8. Manual operation box; 9. First bearing; 10. Second bearing; 11. Output shaft assembly; 12. Worm gear; 13. Worm; 14. Third bearing; 15. Receiving cavity; 16. Convex ring; 17. Self-rotating bearing; 18. Main shaft; 19. Protective bushing; 20. Keyway; 21. Fixing key; 22. Inner hole; 23. First abutment; 24. Second abutment; 25. Contact surface; 26. Through hole; 27. Limiting key; 28. Limiting groove; 29. ​​Extension; 30. Actuator body; 31. Annular groove. Detailed Implementation

[0038] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0039] Example:

[0040] A spring-reset electric actuator with a manually operated structure, reference Figure 1 and Figure 2 The actuator body 30 includes a central shaft 1 and an elastic element. In this embodiment, the elastic element includes a torsion spring 2. The central shaft 1 is rotatably connected inside the actuator body 30 and is connected to a valve to drive the valve to open and close. The torsion spring 2 is fixedly connected inside the actuator body 30. The end of the central shaft 1 away from the valve is fixedly connected to the torsion spring 2, and the other end of the torsion spring 2 is fixed inside the actuator body 30 by welding. A base 3 is rotatably connected inside the actuator body 30. The end of the central shaft 1 that is fixed to the torsion spring 2 is fixedly installed on the top surface of the base 3. A transmission assembly 4 is driven to the bottom surface of the base 3. A handwheel 5 is fixedly connected to the end of the transmission assembly 4 away from the base 3. The rotation of the handwheel 5 drives the transmission assembly 4 to drive the base 3 to rotate. The rotation of the base 3 drives the central shaft 1 to rotate and drives the torsion spring 2 to coil and compress. The rotation of the central shaft 1 drives the valve to rotate, thereby realizing the opening and closing of the valve.

[0041] refer to Figure 1 and Figure 3 The transmission assembly 4 includes a driving wheel 6 and a driven wheel 7 that mesh with each other. The driving wheel 6 is coaxially fixed with the handwheel 5. The actuator body 30 includes a manual operation box 8. The driving wheel 6 is rotatably connected inside the manual operation box 8. The manual operation box 8 is provided with a first bearing 9 and a second bearing 10 whose outer rings are fixedly connected to the inner side wall of the manual operation box 8. The outer circumference of the driving wheel 6 is fixedly connected to the inner ring of the first bearing 9. The end of the driving wheel 6 away from the handwheel 5 is fixedly connected to the inner ring of the second bearing 10, so that the driving wheel 6 is rotatably connected inside the manual operation box 8, and the stability of the rotation process is enhanced. The driving wheel 6 meshes with the driven wheel 7. By rotating the handwheel 5, the motion is transmitted to the driven wheel 7 through the driving wheel 6, thereby driving the driven wheel 7 to rotate.

[0042] refer to Figure 2 and Figure 3 The transmission assembly 4 also includes an output shaft assembly 11, a worm gear 12 and a worm 13 that are engaged in transmission. A third bearing 14 is fixedly connected between the worm 13 and the inner peripheral wall of the manual operation box 8 to ensure that the worm 13 rotates stably within the manual operation box 8. The worm gear 12 abuts against the output shaft assembly 11 and drives the output shaft assembly 11 to rotate. The driven wheel 7 is coaxially fixed with the worm 13, so that the rotation of the driven wheel 7 can drive the worm 13 to rotate. The worm 13 then drives the worm gear 12 to rotate, realizing the rotation of the output assembly. The transmission between the worm gear 12 and the worm 13 makes the transmission process smoother. With the help of the self-locking performance of the worm gear 12 and the worm 13, the output assembly is prevented from reversing after the manual rotation of the handwheel 5 is stopped, ensuring the stable positioning of the entire transmission assembly 4.

[0043] refer to Figure 2 and Figure 3 The manual operation box 8 is provided with a receiving cavity 15. The end of the worm gear 12 near the torsion spring 2 protrudes to form a convex ring 16. A self-rotating bearing 17 is fixedly connected between the receiving cavity 15 and the convex ring 16. The outer ring of the self-rotating bearing 17 is fixedly connected to the side wall of the receiving cavity 15, and the inner ring of the self-rotating bearing 17 is fixedly connected to the convex ring 16. The stable transmission of the worm gear 12 is ensured by the self-rotating bearing 17.

[0044] refer to Figure 2 and Figure 4 The output shaft assembly 11 includes a main shaft 18 and a protective sleeve 19 fixedly sleeved on the main shaft 18. Both the main shaft 18 and the protective sleeve 19 have keyways 20 of matching size and shape, and corresponding positions on opposite sides. A fixing key 21 is interference-fitted into the keyway 20 to achieve a fixed connection between the main shaft 18 and the protective sleeve 19. The worm gear 12 has an inner hole 22 at its center to accommodate the output shaft assembly 11. The end of the output shaft assembly 11 is located in the inner hole 22. A first abutment 23 protrudes from the inner wall of the inner hole 22. The first abutment 23 is pointed in shape and integrally formed with the worm gear 12. A second abutment 24 protrudes from the outer wall of the protective sleeve 19. The second abutment 24 is... It is pointed and integrally formed with the protective bushing 18. An annular groove 31 is left between the protective bushing 19 and the side wall of the inner hole 22 for the first contact member to move. After the worm gear 12 rotates, the first contact member 23 makes a circular motion in the annular groove and abuts against the second contact member 24 after a certain stroke. Through the abutment of the first contact member 23 and the second contact member 24, the worm gear 12 drives the protective bushing 19 and the main shaft 18 to rotate. The first contact member 23 and the second contact member 24 are both provided with a mating surface 25 that fits against each other, so that the mating surface 25 between the first contact member 23 and the second contact member 24 has a higher degree of fit, which ensures the rotation efficiency of the worm gear 12 driving the protective bushing 19 and the main shaft 18.

[0045] refer to Figure 3 and Figure 4A through hole 26 is provided on the base 3. The end of the main shaft 18 away from the worm gear 12 extends into the through hole 26 and is welded and fixed to the side wall of the through hole 26, so that the rotation of the main shaft 18 can drive the base 3 to rotate. A limit key 27 is formed by the protrusion of the inner side wall of the through hole 26, and a limit groove 28 is formed by the recess of the outer side wall of the central shaft 1, which is interference-fitted with the limit key 27. The central shaft 1 passes through the opening of the through hole 26 away from the end of the main shaft 18. Through the interference fit between the limit key 27 and the limit groove 28, the central shaft 1 is fixed on the base 3, so that the rotation of the base 3 drives the rotation of the central shaft 1, thereby realizing the control of the valve. An extension 29 for placing the torsion spring 2 is formed on the outer side of the base 3. One end of the torsion spring 2 is welded and fixed to the extension 29. The rotation of the base 3 causes the torsion spring 2 to be wound and compressed. After the valve is fully open or fully closed, the handwheel 5 is stopped, the valve remains stationary, and the torsion spring 2 is in a stored energy state. In case of accidental power failure or emergency shutdown, it is combined with Figure 1 The actuator body 30 can quickly reset the valve through the pre-compressed torsion spring 2, ensuring the normal operation of the equipment.

[0046] The implementation principle of this application embodiment is as follows: When the valve needs to be opened in the event of a power outage, the handwheel 5 is manually rotated counterclockwise. The rotation of the handwheel 5 drives the drive wheel 6 to rotate, which in turn drives the driven wheel 7, worm 13, and worm wheel 12 to rotate. After the worm wheel 12 rotates, it drives the first contact member 23 to rotate. At this time, the first contact member 23 is not in contact with the second contact member 24, and the torsion spring 2 is not compressed, making it relatively easy to rotate the handwheel 5. When the worm wheel 12 drives the first contact member 23 to rotate until it is in contact with the second contact member 24 and drives the main shaft 18 to rotate, the main shaft 18 rotates, which drives the base 3 to rotate. The base 3 rotates, which drives the central shaft 1 to rotate and coils and compresses the torsion spring 2. Manually rotating the handwheel 5 is relatively difficult. The central shaft 1 rotates until the valve is fully opened, and then the rotation of the handwheel 5 is stopped. The worm wheel 12 and worm 13 use their self-locking properties to keep the actuator body 30 in place. In the initial state, the valve remains open, and the torsion spring 2 is in an energy storage state, preparing for valve reset in an emergency. When manual valve closure is required, turn the handwheel 5 clockwise. The handwheel 5 drives the driving wheel 6 and driven wheel 7 to rotate, which in turn drives the worm gear 12 and worm 13. The worm gear 12 drives the base 3 to rotate, which in turn rotates the central shaft 1 and resets the torsion spring 2. As the torsion spring 2 recovers its deformation, manually turning the handwheel 5 becomes easier until the central shaft 1 drives the valve to the fully closed state. If switching to electric mode is required, turn the handwheel 5 clockwise again, so that the first contact member 23 gradually moves away from the second contact member 24, reserving sufficient rotation stroke for the rotation of the second contact member 24 under electric operation. This prevents the first contact member 23 from colliding with the second contact member 24 when the valve is not fully open, which would affect the full opening of the valve and damage the transmission assembly 4.

[0047] 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 spring-reset electric actuator with a manually operated structure, comprising an actuator body (30), the actuator body (30) including a central shaft (1) and an elastic element located within the actuator body (30), the central shaft (1) being rotatably connected to the actuator body (30), one end of the elastic element being fixedly connected to the actuator body (30), and the other end being fixedly connected to the central shaft (1), characterized in that: The executor body (30) is provided with a base (3) rotationally connected with the executor body (30), a transmission assembly (4) drivingly connected with the base (3), and a hand wheel (5) arranged on the transmission assembly (4). The central shaft (1) is fixedly connected with the elastic member on the base (3), and the hand wheel (5) drives the base (3) to rotate through the transmission assembly (4).

2. A spring-return electric actuator having a manual operation structure according to claim 1, characterized in that: The transmission assembly (4) comprises an output shaft assembly (11), a transmission-matched worm wheel (12) and a worm (13). The worm wheel (12) abuts against the output shaft assembly (11) and drives the output shaft assembly (11) to rotate.

3. A spring-return electric actuator having a manual operation structure according to claim 2, characterized in that: The worm wheel (12) is provided with an inner hole (22) for accommodating the output shaft assembly (11). The inner side wall of the inner hole (22) is protruded to form a first abutting part (23). The outer side wall of the output shaft assembly (11) is protruded to form a second abutting part (24). The first abutting part (23) abuts against the second abutting part (24) after the worm wheel (12) rotates.

4. A spring-return electric actuator having a manual operation structure according to claim 3, characterized in that: The first abutting part (23) and the second abutting part (24) are respectively provided with a matching surface (25).

5. A spring-return electric actuator having a manual operation structure according to claim 4, characterized in that: The output shaft assembly (11) comprises a main shaft (18) and a protective sleeve (19) fixedly sleeved on the main shaft (18). The second abutting part (24) is located outside the protective sleeve (19).

6. A spring-return electric actuator having a manual operation structure according to claim 5, characterized in that: The main shaft (18) and the protective sleeve (19) are fixedly connected through a key.

7. A spring-return electric actuator having a manual operation structure according to claim 2, characterized in that: The transmission assembly (4) further comprises a driven wheel (7) fixedly connected with the worm (13) and a driving wheel (6) engaged with the driven wheel (7). The driving wheel (6) is coaxially fixed with the hand wheel (5).

8. A spring-return electric actuator having a manual operation structure according to claim 1, characterized in that: The base (3) is provided with a through hole (26). The inner side wall of the through hole (26) is protruded to form a limiting key (27). The outer side of the central shaft (1) is recessed to form a limiting groove (28) in interference fit with the limiting key (27).

9. A spring-return electric actuator having a manual operation structure according to claim 1, characterized in that: The executor body (30) is provided with an installation cavity for installing the worm wheel (12). The worm wheel (12) is protruded to form a convex ring (16). The side wall of the installation cavity is fixedly provided with a self-rotating bearing (17) having an inner ring fixedly connected with the convex ring (16).

Images