A smart disconnect switch with an automatic locking structure for closing rack and pinion

Abstract

The purpose of this invention is to lock the rack securely when the intelligently operated disconnecting switch is closed, regardless of external vibration or other causes, to prevent the rack from sliding freely and accidentally pushing away from the high-voltage energizing arm, thus preventing a high-voltage arcing hazard. The basic technical solution features: a rack locking arm; a rack locking seat; a rack locking head; a lock arm return spring; a cam with a protruding head on its outer circumference; and a gear with a limiting post on its surface. The rack locking arm is screwed onto the base plate of the rack arm, which is in turn fixed to a base plate by screws. The rack locking seat has a rectangular locking seat at the lower right corner of the rack. The locking head is located at the lower end of the rack locking arm and is cylindrical. The rack arm return spring is mounted on the rack base plate via a fulcrum screw, through the rack locking arm, and through the base plate. The cam and gear are mounted on the splined shaft of the motor, with one upper and one lower counterweight.

Description

Technical Field

[0001] This invention belongs to the field of automation and intelligent innovation of power distribution network transmission line equipment, and specifically relates to the innovation of automated, intelligent and safe operation of disconnecting switches of transmission lines. Background Technology

[0002] Intelligent disconnect switches are used in power distribution lines to solve safety problems associated with manual operation. If an intelligent high-voltage disconnect switch does not have a rack and pinion safety lock function after closing, such as when it is used near a road or railway and encounters vibrations from a car or train, or strong winds, the rack of the intelligent disconnect switch may accidentally slide downwards. This causes the push-pull rod of the disconnect switch to fall and push the energized arm away from the stationary contact. (The standard operation is that the low-voltage load must be disconnected before the high-voltage disconnect switch is opened.) This will create a high-voltage arcing hazard and cause serious damage to the power line. This invention discloses an intelligent disconnect switch with an automatic locking structure for the rack and pinion when the intelligent disconnect switch is closed. The automatic locking head will firmly lock the lock seat on the rack and pinion. No external interference force can cause the rack and pinion of the intelligent disconnect switch to slide down malfunctionly, thus avoiding the danger of high voltage arcing caused by accidental sliding of the rack and pinion. Summary of the Invention

[0003] The purpose of this invention is to automatically lock the safety lock when the intelligent operation isolating switch is closed, so that the rack can be firmly locked regardless of the external vibration or other reasons, so as to prevent the rack from sliding down accidentally and pushing away from the high voltage energizing arm, causing the danger of high voltage arcing. The present invention discloses an intelligent disconnect switch with an automatic locking structure for closing rack and pinion, characterized by including a rack and pinion locking arm; a rack and pinion locking seat; a lock head; a lock arm return spring; a cam; gears, etc. The rack and pinion locking arm is mounted on the base plate of the rack and pinion arm with screws, and the base plate of the rack and pinion arm is fixed to the base plate with screws. The rack and pinion lock seat has a rectangular step designed at the lower right corner of the rack. The lock head is located at the lower end of the rack and pinion lock arm. The lock head is cylindrical and is fixed to the lower end of the lock arm with an internal hex screw through the lock arm and a nut. The lock head is located at the corresponding position of the lock seat. The lock arm return spring is a long spring wire that is mounted on the rack base plate via a fulcrum screw, through the rack lock arm, and then through the base plate. The cam and gear described herein are characterized by an upper and lower weighted pad being fitted onto the splined shaft of the motor. Furthermore, the gear has the following characteristics: the inner circle of the gear has no teeth, the outer circle of the gear has teeth that rotate with the rack, and the surface of the gear is provided with a limiting post for limiting the long hole of the cam. Furthermore: The cam is characterized by having no teeth on its outer circle, while its inner circle is provided with splined teeth that mesh with the splined shaft of the motor. Furthermore, the outer circle of the cam is provided with a protrusion, which is used to push open the locking arm first when operating the isolating switch to open the circuit breaker, so that the lock head can leave the lock seat in time for unlocking and opening the circuit breaker. Furthermore, the cam surface is provided with an elongated hole for the limiting post on the matching gear. The diameter of the elongated hole is slightly larger than the diameter of the limiting post, so that the protrusion on the cam can rotate freely when unlocking. Attached Figure Description Figure 1 This is a schematic diagram of the overall structure of an intelligent disconnecting switch with an automatic locking mechanism for the rack and pinion when closing. The diagram shows that the energizing arm of the disconnecting switch is in the closed state and the rack and pinion lock is in the locked state. In the diagram: 1. Rack base plate; 2. Rack lock arm mounting base plate; 3. Rack lock arm; 4. Lock arm return spring; 5. Rack lock seat; 6. Rack lock head; 7. Rack; 8. Bearing groove for the rack's up-and-down movement; 9. Gear stacked under the cam and mounted on the motor shaft; 10. Cam; 11. Long hole on the cam; 12. Motor spline shaft; 13. Limiting post; 14. Cam protrusion; 15. Push-pull rod; 16. Power-on arm. Figure 2 These are gears and cams mounted on the splined shaft of the motor; in the diagram, 1. Gear; 2. Cam; 3. Limiting post; 4. Cam protrusion. Figure 3 This is a feature diagram of a gear and a cam. In the diagram, 1. Gear; 2. Limiting post; 3. Cam; 4. Elongated hole; 5. Cam protrusion. (1) Features of gears: The outer circle has teeth, the inner circle has no teeth, and the gear surface is provided with a limiting post; (2) Features of cams: The outer circle has no teeth, the inner circle has spline teeth, the cam is provided with a long hole, and the outer circle of the cam is provided with a protrusion. Figure 4 The diagram shows the state after the disconnecting switch is closed, with the rack locked (left); and the state when the switch is opened, with the protrusion on the cam pushing open the locking arm to allow the locking head to leave the locking seat and begin opening (right). In the diagram, 1. Limit pin; 2. Protrusion on the cam; 3. Locking seat of the rack lock; 4. Locking head of the rack lock. Detailed Implementation Combination Figure 1 — Figure 4 This is a schematic diagram of an intelligent disconnect switch with an automatic locking structure for closing rack and pinion, as shown in the following figures: 1. By Figure 1As shown, when the intelligent operation disconnect switch is closed, the push-pull rod (15) rotates clockwise under the action of the motor, causing the rack (7) to rise and pull the energized arm (16) of the disconnect switch toward closing. At this time, the lock head (6) on the lock arm (3) also moves upward along the side of the rack (7). When the lock head (6) moves upward past the lock seat (5), the lock arm return spring (4) presses the lock head (6) on the lock arm below the lock seat (6) of the rack. Figure 4 As shown on the left, the rack (7) is firmly locked in place to prevent it from sliding. No matter how strong the external interference force is, the rack (7) will not slide down freely, thus achieving the purpose of automatic locking of the rack when the intelligent disconnect switch is closed. 2 By Figure 4 (Right) As shown: When the intelligent disconnect switch is operated to open, the motor is energized and rotates counterclockwise. The cam mounted on the spline shaft of the motor rotates counterclockwise first, and the convex head (7) on the cam also rotates, pushing the locking arm (11) open first. At this time, the locking head (5) leaves the locking seat (6) and is disengaged from the locking seat position. At this time, the motor continues to rotate, and the long hole on the cam pushes the limit post (8) on the gear to continue rotating. The gear rotates and the rack (13) moves downward. The push-pull rod (14) connected to the rack (13) continues to push down, pushing the energized arm of the switch to open, thus completing the intelligent operation of the intelligent disconnect switch to open. The important thing about this operation is that the rack (13) of the disconnect switch can automatically engage the safety lock after the switch is closed, which effectively solves the fatal problem that the rack (13) of the switch may accidentally slide down at any time after the intelligent disconnect switch is closed because it is not locked. The goal is to enable intelligent disconnect switches to automatically unlock and then automatically open during operation and to automatically lock after operation and closing.

Claims

1. An intelligent disconnect switch with an automatic locking structure for closing rack and pinion, as shown in Figure 1, is characterized in that: Includes: rack lock arm mounting base plate (2); rack lock arm (3); lock arm return spring (4); rack lock seat (5); rack lock head (6); rack with lock seat (7); gear with limit post (9); cam (10) with internal circular spline teeth but no external circular teeth, the cam (10) is designed with elongated hole (11) and protrusion (14). The rack lock arm (3) is mounted on the rack lock arm mounting base plate (2) by screws; the rack lock arm mounting base plate (2) is fixed on the rack base plate (1) by screws; the rack lock seat (5) is located at the lower right corner of the rack (7), and the rack lock seat (5) is rectangular; the rack lock head (6) is located at the lower end of the rack lock arm (3) and corresponds to the rack lock seat, and the rack lock head (6) is cylindrical, and is fixed at the lower end of the rack lock arm by passing through the rack lock arm with an internal hex screw and then by a nut; the return spring (4) of the rack lock arm is fixed on the rack base plate (1) by passing through the rack lock arm (3) and the rack lock arm mounting base plate (2) with screws.

2. According to claim 1, in Figure 1, the cam (10) and the gear (9) with the limiting post are mounted on the splined shaft (12) of the motor in an overlapping manner. The gear (9) is characterized in that: the inner hole of the gear (9) has no teeth, the outer circle of the gear has teeth that cooperate with the rack (7) to rotate, and the surface of the gear (9) is provided with a limiting post (13) for limiting the long hole (11) of the cam.

3. According to claim 1, in Figure 1, the cam (10) is characterized in that: the outer circle of the cam has no teeth, and the inner circle of the cam is provided with spline teeth that cooperate with the spline shaft (12) of the motor. The outer circle of the cam (10) is provided with a protrusion (14), which is semi-circular. The cam (10) is provided with an elongated hole (11) for cooperating with the limiting post on the gear (9), the diameter of the elongated hole (11) being slightly larger than the diameter of the limiting post (9) so that the protrusion (14) on the cam (10) can rotate freely when unlocking.

Images