Limiting protection device of valve actuator
By introducing buffer assembly and output shaft limit assembly into the valve actuator, the problems of component damage caused by inertial rotation and reduced control accuracy are solved, and the stability and safety of the equipment are improved.
Patent Information
- Application Number
- CN202422512130.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-17
- Publication Date
- 2025-08-05
- Estimated Expiration
- 2034-10-17
AI Technical Summary
When the air supply of the air intake hole suddenly stops, the output shaft continues to rotate due to inertia, resulting in damage to components, increasing vibration, reducing control accuracy, and safety hazards.
A limit protection device including a buffer assembly and an output shaft limiting assembly is designed. The buffer assembly absorbs inertial impact force through gears, racks, buffer plates and springs. The output shaft limiting assembly limits the output shaft rotation through a motor and a threaded sleeve to ensure accurate position control.
Effectively prevent the output shaft from damaging equipment components due to inertia rotation, reduce wear and fatigue, extend service life, improve control accuracy and safety, and avoid dangers caused by abnormal rotation.
Smart Images
Figure CN223191123U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of valve actuators, in particular to a position limiting protection device for a valve actuator. Background Art
[0002] The limit protection device of the valve actuator is a key component to ensure that the valve can be opened or closed accurately and safely under the drive of the actuator. In particular, pneumatic actuators generally need to cooperate with the limit device to limit the output shaft of the actuator to ensure that the valve actuator can limit the output shaft in time when controlling the opening and closing of the valve, thereby increasing its service life. The limit protection device of the valve actuator has been widely used in industries such as chemical, petroleum, natural gas, electricity and water treatment. When selecting and using the limit protection device, a comprehensive consideration should be made based on actual needs and working environment to ensure that it can meet the control requirements and safety requirements of the system. The following problems exist in the existing technology:
[0003] The existing valve actuator has a limit protection device. When the air supply to the air inlet suddenly stops, the impact force generated by the output shaft continuing to rotate due to inertia will directly act on the actuator body, valve core and other components, which can easily cause damage to these components. Due to the lack of buffering effect, the equipment is easily affected by impact during operation, resulting in increased vibration, unstable operation, and frequent impact force, which shortens the service life of the valve actuator. In addition, the existing device lacks limit protection for the output shaft, which can easily damage valves and other components, increase the cost of maintenance and replacement, and in severe cases may cause serious safety accidents. At the same time, the output shaft may excessively rotate during operation, and the valve position cannot be accurately controlled, resulting in reduced control accuracy, which may affect key links such as flow control and pressure regulation in the production process. Utility Model Content
[0004] The utility model provides a limit protection device for a valve actuator to solve the problems raised in the above background technology.
[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:
[0006] A limit protection device for a valve actuator comprises an actuator body, wherein the bottom of the actuator body is fixedly connected to a fixing frame, the top of the fixing frame is rotatably connected to an output shaft that passes through the interior of the actuator body, the bottom of the fixing frame is fixedly connected to a valve sleeve, the bottom of the output shaft passes through the interior of the valve sleeve and is fixedly connected to a valve core, the right side of the front side wall of the actuator body is fixedly connected to an air inlet, the left side of the front side wall of the actuator body is fixedly connected to an air outlet, the top of the actuator body is fixedly connected to a control panel, a buffer assembly is provided on the upper interior of the fixing frame, and an output shaft limit assembly is provided on the lower interior of the fixing frame.
[0007] A further improvement of the technical solution of the present invention is that: the buffer assembly includes a gear, the inner wall of the gear is fixedly connected to the top of the outer wall of the control panel, the front and rear inner walls of the fixed frame are fixedly connected with guide rails, the interiors of the front and rear guide rails are slidably connected with racks, and the front and rear sides of the gear are respectively meshed with the front and rear racks.
[0008] The cam is fixedly provided with two guide rails at two ends, and two guide rails are connected with the guide rails at the two ends of the cam, and the guide rails are connected with two guide rails at the two ends of the cam.
[0009] A further improvement of the technical solution of the present utility model is that: the output shaft limiting assembly includes a motor, the left side wall of the motor is fixedly connected to the rear and lower right side wall of the fixed frame, the left and right inner walls of the fixed frame are rotatably connected with double-headed screws, the right end of the double-headed screw passes through the right outer wall of the fixed frame and is fixedly connected to the output end of the motor, the left and right sides of the outer wall of the double-headed screw are threadedly connected with threaded sleeves, the rear inner wall of the fixed frame is provided with a groove, the rear side walls of the left and right threaded sleeves are fixedly connected with rectangular sliders that are slidably connected to the inner walls of the groove, the bottom of the outer wall of the output shaft is fixedly connected with a rotating disk, and the front sides of the left and right threaded sleeves are fixedly connected with a limiting ring mounted on the outer wall of the rotating disk.
[0010] A further improvement of the technical solution of the present utility model is that the control panel is electrically connected to the pressure sensor and the motor respectively.
[0011] Due to the adoption of the above technical solution, the present invention has achieved the following technical advancements compared to the prior art:
[0012] 1. The utility model provides a limit protection device for a valve actuator. By providing a buffer component, it effectively prevents the output shaft from continuing to rotate due to inertia and causing damage to the actuator body or valve core, thereby ensuring the integrity of the equipment. At the same time, by buffering the impact force, it reduces wear and fatigue between various parts of the equipment, reduces the frequency of equipment maintenance and replacement, and thus extends the service life of the valve actuator.
[0013] 2. The utility model provides a limit protection device for a valve actuator. By setting an output shaft limit assembly, the rotation of the output shaft is accurately limited to play a limit protection role. This helps to ensure accurate position control of the valve, improve the control accuracy of the valve actuator, and prevent the output shaft from excessively rotating due to abnormal conditions and damaging the valve and other components. The limit protection function can also avoid dangerous situations caused by loss of control of the output shaft, thereby improving the safety of the entire valve execution system. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 It is a schematic diagram of the overall structure of the utility model;
[0015] Figure 2 This is a schematic diagram of the internal structure of the fixed frame of the present utility model;
[0016] Figure 3 This is a schematic diagram of the structure of some components of the utility model;
[0017] Figure 4 This is a schematic structural diagram of the buffer component of the present utility model;
[0018] Figure 5 This is a schematic structural diagram of the output shaft limiting assembly of the utility model.
[0019] In the figure: 10. Actuator body; 11. Fixed frame; 12. Output shaft; 13. Valve sleeve; 14. Air inlet; 15. Air outlet; 16. Control panel; 2. Buffer assembly; 20. Gear; 21. Guide rail; 22. Rack; 23. Rectangular groove; 24. Slide rod; 25. Spring; 26. Slide sleeve; 27. Connecting rod; 28. Buffer plate; 29. Pressure sensor; 201. Damper; 202. Fixed block; 203. Rectangular plate; 3. Output shaft limit assembly; 30. Double-headed screw; 31. Motor; 32. Threaded sleeve; 33. Groove; 34. Rectangular slider; 35. Rotating disk; 36. Limit ring. DETAILED DESCRIPTION
[0020] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods:
[0021] like Figure 1 、 Figure 2 As shown, the utility model provides a limit protection device for a valve actuator, including an actuator body 10, a fixed frame 11 is fixedly connected to the bottom of the actuator body 10, and an output shaft 12 that penetrates into the interior of the actuator body 10 is rotatably connected to the top of the fixed frame 11, a valve sleeve 13 is fixedly connected to the bottom of the fixed frame 11, and the bottom of the output shaft 12 penetrates into the interior of the valve sleeve 13 and is fixedly connected to the valve core, an air inlet 14 is fixedly connected to the right side of the front side wall of the actuator body 10, an air outlet 15 is fixedly connected to the left side of the front side wall of the actuator body 10, a control panel 16 is fixedly connected to the top of the actuator body 10, a buffer assembly 2 is provided on the upper interior of the fixed frame 11, and an output shaft limit assembly 3 is provided on the lower interior of the fixed frame 11.
[0022] like Figure 3 、 Figure 4 As shown, the buffer assembly 2 includes a gear 20, the inner wall of the gear 20 is fixedly connected to the top of the outer wall of the control panel 16, the front and rear inner walls of the fixed frame 11 are fixedly connected with guide rails 21, the interiors of the front and rear guide rails 21 are slidably connected with racks 22, and the front and rear sides of the gear 20 are respectively meshed with the front and rear racks 22.
[0023] like Figure 3 、 Figure 4 As shown, the inner walls of the left and right sides of the fixed frame 11 are fixedly connected with rectangular plates 203, and the side of the rectangular plate 203 close to the rack 22 is provided with four rectangular grooves 23 distributed in a rectangular shape. The interiors of the front and rear rectangular grooves 23 are fixedly connected with slide rods 24, and the outer walls of the front and rear slide rods 24 are slidably connected with slide sleeves 26. The opposite sides of the front and rear slide sleeves 26 are fixedly connected with springs 25 sleeved on the outer walls of the slide rods 24. The sides of the front and rear springs 25 away from each other are fixedly connected to the inner walls of the front and rear rectangular grooves 23 respectively. The upper and lower sides are both rotatably connected with connecting rods 27, and the front and rear connecting rods 27 are rotatably connected to the fixed block 202 at one end away from the sliding sleeve 26. The fixed block 202 is fixedly connected to the side close to the gear 20 with a buffer plate 28. The front and rear sides of the buffer plate 28 are respectively slidably connected to the inner walls of the front and rear guide rails 21. The side of the buffer plate 28 close to the gear 20 is fixedly connected to a pressure sensor 29 for receiving the pressure value from the rack 22, and the four corners of the rectangular plate 203 close to the rack 22 are fixedly connected to dampers 201 fixedly connected to the buffer plate 28.
[0024] When the air supply to the actuator air inlet 14 is suddenly stopped, the output shaft 12 will continue to rotate due to inertia. The bottom of the output shaft 12 passes through the inside of the valve sleeve 13 and is fixedly connected to the valve core, and the outer wall of the output shaft 12 is fixedly connected to the gear 20. The output shaft 12 continues to rotate to drive the gear 20 to rotate. Since the front and rear sides of the gear 20 are respectively engaged with the front and rear racks 22, the rotation of the gear 20 drives the rack 22 to move. While the rack 22 moves, it squeezes the buffer plate 28. The pressure sensor 29 on the buffer plate 28 detects the pressure value from the rack 22 and transmits the signal to the control panel 16. After being squeezed, the buffer plate 28 moves toward the inner wall of the fixed frame 11 , driving the sliding sleeve 26 to slide on the sliding rod 24, compressing the spring 25. The elastic force of the spring 25 plays a buffering role, reducing the impact of the impact force on the device. At the same time, the dampers 201 at the four corners of the rectangular plate 203 close to the rack 22 also play a damping role, further absorbing the impact force and ensuring the stability of the device. In this way, the buffer assembly 2 effectively prevents the output shaft 12 from continuing to rotate due to inertia and causing damage to the actuator body 10 or the valve core, ensuring the integrity of the equipment. At the same time, by buffering the impact force, the wear and fatigue between the various components of the equipment are reduced, the frequency of equipment maintenance and replacement is reduced, and the service life of the valve actuator is extended.
[0025] like Figure 5 As shown, the output shaft limiting assembly 3 includes a motor 31, the left side wall of the motor 31 is fixedly connected to the rear and lower right side wall of the fixed frame 11, and the left and right inner walls of the fixed frame 11 are rotatably connected with double-headed screws 30. The right end of the double-headed screw 30 penetrates the right outer wall of the fixed frame 11 and is fixedly connected to the output end of the motor 31. The left and right sides of the outer wall of the double-headed screw 30 are threadedly connected with threaded sleeves 32. A groove 33 is provided on the rear inner wall of the fixed frame 11. The rear side walls of the left and right threaded sleeves 32 are fixedly connected with rectangular sliders 34 that are slidably connected to the inner walls of the groove 33. The bottom of the outer wall of the output shaft 12 is fixedly connected with a rotating disk 35, and the front sides of the left and right threaded sleeves 32 are fixedly connected with a limiting ring 36 mounted on the outer wall of the rotating disk 35.
[0026] like Figure 1-5 As shown, the control panel 16 is electrically connected to the pressure sensor 29 and the motor 31 respectively.
[0027] When the pressure sensor 29 in the buffer assembly 2 detects the pressure value and transmits the signal to the control panel 16, the control panel 16 determines whether the output shaft 12 needs to be limited according to the signal. If necessary, the control panel 16 transmits the signal to the motor 31. After receiving the signal, the motor 31 starts and drives the double-headed screw 30 to rotate. Since the rectangular slider 34 on the rear side wall of the threaded sleeve 32 is slidably connected with the groove 33, the rotation of the threaded sleeve 32 is limited, so that the threaded sleeve 32 can only move axially along the double-headed screw 30. When the double-headed screw 30 rotates, the left and right threaded sleeves 32 will approach or move away from each other. When the threaded sleeves 32 approach each other, the limit ring 36 on the front side will cover the rotating disk 35 at the bottom of the outer wall of the output shaft 12, thereby accurately limiting the rotation of the output shaft 12 and playing a role of limit protection. This helps to ensure accurate position control of the valve, improve the control accuracy of the valve actuator, and prevent the output shaft 12 from excessive rotation due to abnormal conditions and damaging the valve and other components. The limit protection function can also avoid dangerous situations caused by loss of control of the output shaft 12, thereby improving the safety of the entire valve execution system.
[0028] It should be noted that the control panel 16 , the actuator body 10 , and the damper 201 are all prior arts and will not be described in detail here.
[0029] The following is a detailed description of the working principle of the limit protection device of the valve actuator.
[0030] like Figure 1-5 As shown, when the air supply to the actuator air inlet 14 is suddenly stopped, the output shaft 12 will continue to rotate due to inertia. The bottom of the output shaft 12 passes through the inside of the valve sleeve 13 and is fixedly connected to the valve core, and the outer wall of the output shaft 12 is fixedly connected to the gear 20. The output shaft 12 continues to rotate to drive the gear 20 to rotate. Since the front and rear sides of the gear 20 are respectively engaged with the front and rear racks 22, the rotation of the gear 20 drives the rack 22 to move. While the rack 22 moves, it squeezes the buffer plate 28. The pressure sensor 29 on the buffer plate 28 detects the pressure value from the rack 22 and transmits the signal to the control panel 16. After being squeezed, the buffer plate 28 moves toward the inner wall of the fixed frame 11 The movement drives the sleeve 26 to slide on the slide rod 24, compressing the spring 25. The elastic force of the spring 25 plays a buffering role, reducing the impact of the impact force on the device. At the same time, the dampers 201 at the four corners of the rectangular plate 203 close to the rack 22 also play a damping role, further absorbing the impact force and ensuring the stability of the device. In this way, the buffer assembly 2 effectively prevents the output shaft 12 from continuing to rotate due to inertia and causing damage to the actuator body 10 or the valve core, thereby ensuring the integrity of the equipment. At the same time, by buffering the impact force, the wear and fatigue between the various components of the equipment are reduced, the frequency of equipment maintenance and replacement is reduced, and the service life of the valve actuator is extended.
[0031] When the pressure sensor 29 in the buffer assembly 2 detects the pressure value and transmits the signal to the control panel 16, the control panel 16 determines whether the output shaft 12 needs to be limited according to the signal. If necessary, the control panel 16 transmits the signal to the motor 31. After receiving the signal, the motor 31 starts and drives the double-headed screw 30 to rotate. Since the rectangular slider 34 on the rear side wall of the threaded sleeve 32 is slidably connected with the groove 33, the rotation of the threaded sleeve 32 is limited, so that the threaded sleeve 32 can only move axially along the double-headed screw 30. When the double-headed screw 30 rotates, the left and right threaded sleeves 32 will approach or move away from each other. When the threaded sleeves 32 approach each other, the limit ring 36 on the front side will cover the rotating disk 35 at the bottom of the outer wall of the output shaft 12, thereby accurately limiting the rotation of the output shaft 12 and playing a role of limit protection. This helps to ensure accurate position control of the valve, improve the control accuracy of the valve actuator, and prevent the output shaft 12 from excessive rotation due to abnormal conditions and damaging the valve and other components. The limit protection function can also avoid dangerous situations caused by loss of control of the output shaft 12, thereby improving the safety of the entire valve execution system.
[0032] The above generally describes the present invention in detail. However, it is obvious to those skilled in the art that modifications or improvements may be made to the present invention. Therefore, modifications or improvements that do not depart from the spirit of the present invention are within the scope of protection of the present invention.
Claims
1. A limit protection device for a valve actuator, comprising an actuator body (10), characterized in that: The bottom of the actuator body (10) is fixedly connected to a fixed frame (11), the top of the fixed frame (11) is rotatably connected to an output shaft (12) that passes through the interior of the actuator body (10), the bottom of the fixed frame (11) is fixedly connected to a valve sleeve (13), the bottom of the output shaft (12) passes through the interior of the valve sleeve (13) and is fixedly connected to a valve core, the right side of the front side wall of the actuator body (10) is fixedly connected to an air inlet (14), the left side of the front side wall of the actuator body (10) is fixedly connected to an air outlet (15), the top of the actuator body (10) is fixedly connected to a control panel (16), a buffer assembly (2) is provided above the interior of the fixed frame (11), and an output shaft limiting assembly (3) is provided below the interior of the fixed frame (11).
2. The position limiting protection device for a valve actuator according to claim 1, characterized in that: The buffer assembly (2) comprises a gear (20), the inner wall of the gear (20) is fixedly connected to the top of the outer wall of the control panel (16), the front and rear inner walls of the fixed frame (11) are fixedly connected to guide rails (21), the interiors of the front and rear guide rails (21) are slidably connected to racks (22), and the front and rear sides of the gear (20) are respectively meshed with the front and rear racks (22).
3. The position limiting protection device for a valve actuator according to claim 2, characterized in that: The inner walls of the left and right sides of the fixed frame (11) are fixedly connected with rectangular plates (203), and the side of the rectangular plate (203) close to the rack (22) is provided with four rectangular grooves (23) distributed in a rectangular shape. The interiors of the front and rear rectangular grooves (23) are fixedly connected with sliding rods (24), and the outer walls of the front and rear sliding rods (24) are slidably connected with sliding sleeves (26). The opposite sides of the front and rear sliding sleeves (26) are fixedly connected with springs (25) sleeved on the outer walls of the sliding rods (24). The sides of the front and rear springs (25) that are away from each other are fixedly connected to the inner walls of the front and rear rectangular grooves (23) respectively. The upper and lower ends of the front and rear sliding sleeves (26) are fixedly connected with springs (25) sleeved on the outer walls of the sliding rods (24). Both sides are rotatably connected with connecting rods (27), and the ends of the front and rear connecting rods (27) away from the sliding sleeve (26) are rotatably connected with fixed blocks (202). The fixed block (202) is fixedly connected with a buffer plate (28) on the side close to the gear (20). The front and rear sides of the buffer plate (28) are respectively slidably connected to the inner walls of the front and rear guide rails (21). The side of the buffer plate (28) close to the gear (20) is fixedly connected with a pressure sensor (29) for receiving the pressure value from the rack (22). The four corners of the side of the rectangular plate (203) close to the rack (22) are fixedly connected with dampers (201) fixedly connected to the buffer plate (28).
4. The position limiting protection device for a valve actuator according to claim 3, characterized in that: The output shaft limiting assembly (3) comprises a motor (31), the left side wall of the motor (31) is fixedly connected to the rear lower side of the right side wall of the fixed frame (11), the left and right inner walls of the fixed frame (11) are rotatably connected with double-headed screws (30), the right end of the double-headed screw (30) passes through the right outer wall of the fixed frame (11) and is fixedly connected to the output end of the motor (31), the left and right outer walls of the double-headed screw (30) are both threadedly connected with threaded sleeves (32), the rear inner wall of the fixed frame (11) is provided with a groove (33), the rear side walls of the left and right threaded sleeves (32) are both fixedly connected with rectangular sliders (34) slidably connected to the inner wall of the groove (33), the outer wall bottom of the output shaft (12) is fixedly connected with a rotating disk (35), and the front sides of the left and right threaded sleeves (32) are fixedly connected with limiting rings (36) sleeved on the outer wall of the rotating disk (35).
5. The position limiting protection device for a valve actuator according to claim 4, characterized in that: The control panel (16) is electrically connected to the pressure sensor (29) and the motor (31) respectively.