Electrically operated actuator for air switches

Abstract

The utility model relates to an electric operating executor of air switch, including the front side movable frame and rear side movable frame for setting in sequence before and after along the swing direction of operating handle, still include the electric drive mechanism for driving the front side movable frame reciprocating movement along before and after, the front side movable frame includes the front side push rod, the rear side movable frame includes the rear side push rod, the front side movable frame is linked with the rear side movable frame through the telescopic structure of telescopic cooperation along before and after, the front side push rod is used for pushing the operating handle to move to the opening direction, the rear side push rod is used for pushing the operating handle to move to the closing direction, the clearance between the front side push rod, the rear side push rod is not less than the bottom swing amplitude of operating handle when telescopic structure is in the maximum extension limit. The utility model provides an electric operating executor of air switch capable of reducing the space along the opening and closing direction, is used for realizing the electric operation to operating handle.

Description

Technical Field

[0001] This utility model relates to an auxiliary opening and closing device for air switches, and more particularly to an electric operating actuator for an air switch. Background Technology

[0002] An air switch is a common switching device in a circuit. Its specific structure is as follows: Figures 1-2 As shown, it includes a switch housing 1, and an operating handle 2 is provided at the upper end of the switch housing. The operating handle has a closing position, a opening position, and a tripping position. In use, the operating handle can be swung from the closing position to the tripping position, from the tripping position to the opening position, and from the opening position to the closing position. When in the tripping position, the operating handle is between the closing position and the opening position.

[0003] When the circuit is working normally, the operating handle is in the closed position. When the circuit encounters special circumstances, such as overload or other conditions, the operating handle will rotate from the closed position to the trip position, commonly known as "tripping". When it is necessary to close the circuit again, the operator needs to move the operating handle from the trip position to the open position, and then the operator moves the operating handle from the open position back to the closed position.

[0004] The problem with existing air circuit breakers is that they require manual operation by personnel on-site, and cannot be operated remotely, which is very time-consuming and labor-intensive. There are some air circuit breakers on the market that can be remotely operated electrically, but the electric actuators of those air circuit breakers are usually assembled with the air circuit breaker at the factory, resulting in the operating handle not being exposed. This causes the air circuit breaker to lose its manual operation function, and on the other hand, this structure is not suitable for modifying existing air circuit breakers. Utility Model Content

[0005] The purpose of this invention is to provide an electric operating actuator for an air switch that can reduce the space occupied along the opening and closing direction, for realizing electric operation of the operating handle.

[0006] The technical solution for an electrically operated actuator for an air switch is as follows: An electric operating actuator for an air switch includes a front movable frame and a rear movable frame arranged sequentially in the swing direction of the operating handle, and an electric drive mechanism for driving the front movable frame to reciprocate in the back-and-forth direction. The front movable frame includes a front push rod, and the rear movable frame includes a rear push rod. The front and rear movable frames are connected by a telescopic structure that expands and contracts in the back-and-forth direction. The front push rod is used to push the operating handle to move in the opening direction, and the rear push rod is used to push the operating handle to move in the closing direction. When the telescopic structure is at its maximum extension limit, the gap between the front and rear push rods is not less than the bottom swing amplitude of the operating handle.

[0007] Furthermore, a movable frame spring is provided between the front movable frame and the rear movable frame to apply a rearward force to the rear movable frame. The electric operating actuator also includes a movable frame stop block for cooperating with the rear movable frame to limit the rearward movement limit of the rear movable frame. The movable frame stop block is located at the top of the rear end of the switch housing.

[0008] Furthermore, the upper end of the operating handle extends through the upper sides of the front movable frame and the rear movable frame.

[0009] Furthermore, the front movable frame includes a first side and a second side fixed to the left and right sides of the front push rod, the rear movable frame includes a third side and a fourth side fixed to the left and right sides of the rear push rod, and the telescopic structure includes a left telescopic structure disposed between the first side and the third side wall and a right telescopic structure disposed between the second side and the fourth side.

[0010] Furthermore, the left telescopic structure includes a left guide hole disposed on the first side, and the left telescopic structure also includes a left guide rod disposed on the third side that cooperates with the left guide hole for guiding movement, and the movable frame spring includes a left spring disposed between the front end of the left guide rod and the bottom of the left guide hole.

[0011] Furthermore, the right telescopic structure includes a right guide hole disposed on the second side, and the right telescopic structure also includes a right guide rod disposed on the fourth side that cooperates with the right guide hole for guiding movement, and the movable frame spring includes a right spring disposed between the front end of the right guide rod and the bottom of the right guide hole.

[0012] Furthermore, a left lead screw nut is provided on the left side of the front movable frame, and a right lead screw nut is provided on the right side of the front movable frame. The electric drive mechanism includes a left motor and a right motor. A left lead screw that cooperates with the left lead screw nut is driven and connected to the motor shaft of the left motor. A right lead screw that cooperates with the right lead screw nut is driven and connected to the motor shaft of the right motor.

[0013] The beneficial effects of this utility model are as follows: In this utility model, the front movable frame and the rear movable frame are connected by a telescopic structure. During normal use, the telescopic structure is at its maximum extension limit position. The gap between the front push rod and the rear push rod is not less than the bottom swing amplitude of the operating handle. Therefore, the front push rod and the rear push rod will not affect the normal swing of the operating handle. The operating handle can be in the closed position, or it can swing from the closed position to the trip position, or it can swing from the trip position to the open position without affecting the normal opening and closing operation of the operating handle. When the operating handle is in the trip position, and the electric drive mechanism is needed to drive the operating handle to close the circuit, the electric drive mechanism drives the front movable frame to move backward. The front push rod drives the operating handle from the trip position to the open position. During this process, since the front and rear movable frames are connected by a telescopic structure, when the operating handle is pushed to the open position by the front push rod, the telescopic structure will retract, reducing the distance between the front and rear push rods. In this way, the overall length of the electric operating actuator will not be too long when in the open position, which is beneficial for use in confined spaces. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of an electrical switch in the prior art of this utility model; Figure 2 for Figure 1 Top view; Figure 3 This is a top view of one embodiment of the electric actuator in this utility model; Figure 4 yes Figure 3 A schematic diagram showing the coordination between the front and rear movable frames; Figure 5 This is a schematic diagram showing the connection between the left-side motor and the left-side lead screw; Figure 6 This is a schematic diagram showing the positions of the front push rod and the rear push rod when the operating handle is in the closed position in this utility model; Figure 7 This is a schematic diagram showing the state of the operating handle when it is in the trip position in this utility model; Figure 8 This is a schematic diagram of the state when the front push rod moves backward and pushes the operating handle to the open position in this utility model; Figure 9 This is a schematic diagram of the state in which the rear push rod moves forward and pushes the operating handle in this utility model; Figure 10 yes Figure 9 A schematic diagram showing the state in which the operating handle is pushed to the closed position by the middle and rear push rod; In the diagram: 1. Switch housing; 2. Operating handle; 3. Left lead screw; 4. Left lead nut; 5. Left motor; 6. Rear movable frame; 7. Rear push rod; 8. Front movable frame; 9. Front push rod; 10. Right motor; 11. Right lead nut; 12. Telescopic structure; 13. Right lead screw; 14. Left guide hole; 15. Left spring; 16. Left guide rod; 17. Right guide hole; 18. Right spring; 19. Right guide rod; 20. First side; 21. Second side; 22. Third side; 23. Fourth side; 24. Motor housing; 25. Housing clearance recess; 26. Motor shaft; 27. Motor shaft gear; 28. Lead screw gear; 29. ​​Movable frame stop. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the present utility model and are not intended to limit the present utility model; that is, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The components of the embodiments of the present utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0016] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0017] It should be noted that relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0018] The features and performance of this utility model will be further described in detail below with reference to the embodiments.

[0019] One embodiment of the electrically operated actuator for an air switch in this utility model is as follows:Figures 3-10 As shown: It includes a front movable frame 8 and a rear movable frame 6 arranged sequentially along the swing direction of the operating handle. The front movable frame 8 is driven by an electric drive mechanism and can move back and forth. The front movable frame and the rear movable frame are connected by a telescopic structure 12 that expands and contracts in the back and forth direction. A movable frame spring is provided between the front movable frame 8 and the rear movable frame 6 to apply a rearward force to the rear movable frame.

[0020] In this embodiment, the front movable frame includes a front push rod 9, and the rear movable frame 6 includes a rear push rod 7. The front push rod 9 and the rear push rod 7 are cylindrical structures. The front movable frame also includes a first side 20 and a second side 21 fixed to the left and right sides of the front push rod. The rear movable frame also includes a third side 22 and a fourth side 23 fixed to the left and right sides of the rear push rod. The telescopic structure includes a left telescopic structure disposed between the first side and the third side and a right telescopic structure disposed between the second side and the fourth side.

[0021] The left telescopic structure includes a left guide hole 14 disposed on the first side, and a left guide rod 16 disposed on the third side that cooperates with the left guide hole for guiding movement. The movable frame spring includes a left spring 15 disposed between the front end of the left guide rod and the bottom of the left guide hole.

[0022] The right telescopic structure includes a right guide hole 17 disposed on the second side, and a right guide rod 19 disposed on the fourth side that cooperates with the right guide hole for guiding movement. The movable frame spring also includes a right spring 18 disposed between the front end of the right guide rod and the bottom of the right guide hole.

[0023] The front push rod 9 is used to push the operating handle 2 to move in the opening direction, and the rear push rod 7 is used to push the operating handle 2 to move in the closing direction. When the telescopic structure 12 is at its maximum extension limit, the gap between the front push rod and the rear push rod is not less than the bottom swing amplitude of the operating handle.

[0024] In this embodiment, the electric actuator further includes a movable frame stop 29 for engaging with the rear movable frame to limit the rearward movement limit of the rear movable frame. The movable frame stop 29 is bonded and fixed to the top of the rear end of the switch housing.

[0025] The upper end of the operating handle 2 extends through the upper side of the front movable frame and the rear movable frame.

[0026] A left lead screw nut 4 is provided on the left side of the front movable frame 8, and a right lead screw nut 11 is provided on the right side of the front movable frame 8. The electric drive mechanism includes a left motor 5 and a right motor 10. A left lead screw 3 that cooperates with the left lead screw nut is driven and connected to the motor shaft 26 of the left motor; a right lead screw 13 that cooperates with the right lead screw nut is driven and connected to the motor shaft of the right motor.

[0027] In this embodiment, the left motor and the right motor adopt a symmetrical structure. First, we will only describe in detail the cooperation between the left motor and the left lead screw. The left motor includes a motor housing 24. The right rear side of the motor housing 24 is provided with a housing avoidance recess 25 for avoiding the left lead screw nut. This helps to improve the forward movement limit of the left lead screw nut.

[0028] The front end of the left lead screw is rotatably mounted on the motor housing of the left motor, and the rear end of the left lead screw is rotatably mounted on the lead screw bearing seat, which is fixed to the upper rear side of the switch housing.

[0029] A motor shaft gear 27 is fixed to the motor shaft of the left motor, and a lead screw gear 28 is fixed to the front end of the left lead screw 3. The motor shaft gear 27 and the lead screw gear 28 mesh for transmission. The left motor is located to the left of the left lead screw, which also helps to reduce the front-to-back length of the electric actuator to accommodate the smaller installation position at the top of the air switch. The entire motor housing can be glued and fixed to the air switch housing, facilitating the modification of existing air switches.

[0030] Under normal use, such as Figure 3 As shown (with the operating handle in the trip position), the distance between the front and rear push rods is sufficient to allow the operating handle to swing freely. The operating handle can swing normally between the closed, tripped, and open positions, facilitating manual operation. When an electric actuator is needed to reclose the operating handle, the left and right lead screws rotate, and the front movable frame moves backward, as shown. Figure 8 As shown, the front push rod pushes the operating handle backward to the open position. At this time, the front push rod is stopped by the movable frame stop, and the distance between the front and rear push rods is close. The rear movable frame will not protrude backward from the switch housing, which is more suitable for use in situations where the operating space in the front and rear directions is limited. Subsequently, the front movable frame moves forward, as shown... Figure 9 As shown, the telescopic structure between the front movable frame and the rear movable frame unfolds, and then, as... Figure 10 As shown, the rear push rod pushes the operating handle to the closed position.

[0031] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. The patent protection scope of the present utility model shall be determined by the claims. Similarly, any equivalent structural changes made based on the description and drawings of the present utility model shall also be included within the protection scope of the present utility model.

Claims

1. An electrically operated actuator for an air switch, characterized in that, It includes a front movable frame and a rear movable frame arranged sequentially in the swing direction of the operating handle, and an electric drive mechanism for driving the front movable frame to reciprocate in the back-and-forth direction. The front movable frame includes a front push rod, and the rear movable frame includes a rear push rod. The front and rear movable frames are connected by a telescopic structure that expands and contracts in the back-and-forth direction. The front push rod is used to push the operating handle to move in the opening direction, and the rear push rod is used to push the operating handle to move in the closing direction. When the telescopic structure is at its maximum extension limit, the gap between the front push rod and the rear push rod is not less than the bottom swing amplitude of the operating handle.

2. The electrically operated actuator according to claim 1, characterized in that: A movable frame spring is provided between the front movable frame and the rear movable frame to apply a rearward force to the rear movable frame. The electric operating actuator also includes a movable frame stop block that cooperates with the rear movable frame to limit the rearward movement limit of the rear movable frame. The movable frame stop block is located at the top of the rear end of the switch housing.

3. The electrically operated actuator according to claim 1, characterized in that: The upper end of the operating handle extends through the upper side of the front movable frame and the rear movable frame.

4. The electrically operated actuator according to claim 2, characterized in that: The front movable frame includes a first side and a second side fixed to the left and right sides of the front push rod, the rear movable frame includes a third side and a fourth side fixed to the left and right sides of the rear push rod, and the telescopic structure includes a left telescopic structure disposed between the first side and the third side wall and a right telescopic structure disposed between the second side and the fourth side.

5. The electrically operated actuator according to claim 4, characterized in that: The left telescopic structure includes a left guide hole on the first side and a left guide rod on the third side that moves in a guide manner with the left guide hole. The movable frame spring includes a left spring between the front end of the left guide rod and the bottom of the left guide hole.

6. The electrically operated actuator according to claim 4, characterized in that: The right telescopic structure includes a right guide hole on the second side and a right guide rod on the fourth side that moves in a guide manner with the right guide hole. The movable frame spring includes a right spring between the front end of the right guide rod and the bottom of the right guide hole.

7. The electrically operated actuator according to any one of claims 1 to 6, characterized in that: A left lead screw nut is provided on the left side of the front movable frame, and a right lead screw nut is provided on the right side of the front movable frame. The electric drive mechanism includes a left motor and a right motor. A left lead screw that cooperates with the left lead screw nut is driven on the motor shaft of the left motor; a right lead screw that cooperates with the right lead screw nut is driven on the motor shaft of the right motor.

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