Buffer with speed regulating valve for vacuum circuit breaker

Abstract

The utility model relates to a vacuum circuit breaker buffer with a speed regulating valve, which belongs to the field of high-voltage circuit breaker switch equipment and comprises a body composed of an upper cover, an outer tube and a base, an inner tube, a piston and a reset spring are arranged in an inner cavity of the body, and the piston is provided with a section of piston rod abutted against the reset spring. According to the utility model, through the arrangement of the speed regulating valve, the adjusting screw rod is adjusted to enable the buffer of the buffer to absorb energy change so as to realize the speed regulating function, the buffer does not need to be frequently assembled and disassembled on the circuit breaker, and the production efficiency is improved.

Description

Technical Field

[0001] This utility model relates to a buffer for a vacuum circuit breaker, specifically a buffer for a vacuum circuit breaker with a speed regulating valve, belonging to the field of high-voltage circuit breaker switchgear. Background Technology

[0002] Circuit breakers are used in power grid circuits to protect electrical appliances in the circuit and the circuit itself. The requirement for a circuit breaker to successfully break is that the withstand voltage of the break point is greater than the recovery voltage of the break point. The recovery voltage of the break point increases with time, and the withstand voltage of the break point increases with the opening distance. Therefore, a large opening speed is required.

[0003] Vacuum circuit breakers utilize the characteristic of high insulation strength with a very small opening distance in a vacuum to achieve circuit protection. Due to their smaller size, safety and stability, and the fact that they do not involve the use of greenhouse gases, they have gradually replaced oil circuit breakers and SF6 gas circuit breakers, and have been increasingly widely used in high-voltage fields.

[0004] When the moving parts in the circuit breaker reach the position where the opening distance is completed, they should be stopped by the limit stop. However, the inertia of motion generates an impact, causing the moving parts to move in the opposite direction, which reduces the opening distance of the circuit breaker. The withstand voltage of the break point decreases as the opening distance decreases. If the withstand voltage of the break point is less than the break point recovery voltage, the break point will be broken down and the breaking will fail. Therefore, a buffer is generally set in the opening movement to absorb excess kinetic energy in order to reduce the impact when the parts are stopped by the limit stop, thereby reducing the dangerous opening rebound.

[0005] The original buffer characteristics (i.e. energy absorption performance) are fixed. Due to different specifications, different moments of inertia, different arc-extinguishing chamber opening distances and speed requirements, assembly factors such as limit positions, buffer intervention positions, and different buffer performance, it is difficult for the same buffer to meet the technical indicators of opening speed and opening and dispensing.

[0006] Therefore, it is necessary to try to find a suitable buffer on the circuit breaker by replacing the buffer. However, frequently installing and removing buffers on the circuit breaker and frequently testing the circuit breaker speed and break value is inefficient and wasteful. Summary of the Invention

[0007] In view of this, the present invention provides a buffer for a vacuum circuit breaker with a speed regulating valve to solve the above-mentioned problems existing in the prior art.

[0008] The technical solution of this utility model to solve the above-mentioned technical problems is as follows:

[0009] A buffer for a vacuum circuit breaker with a speed control valve includes a body consisting of a top cover, an outer tube, and a base. An inner tube, a piston, and a return spring are disposed in the inner cavity of the body. The piston has a piston rod that abuts against the return spring. The other end of the piston rod extends upward through the top cover to form a strike head. The base has a speed control valve that communicates with the inner cavity of the body.

[0010] Based on the above technical solution, the present invention can be further improved as follows.

[0011] Furthermore, the speed control valve includes an adjusting screw and a fixing screw that fits tightly with the adjusting screw.

[0012] Furthermore, the base has mounting holes.

[0013] The beneficial effects of this utility model are: by setting a speed regulating valve, the speed regulation function is achieved by adjusting the adjusting screw to change the buffer absorption energy of the buffer, eliminating the need for frequent installation and removal of the buffer on the circuit breaker, thus improving production efficiency. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 This is an assembly diagram of the present invention;

[0016] Figure 3 This is a schematic diagram of the speed regulation principle of this utility model.

[0017] The attached diagram lists the components represented by each number as follows:

[0018] 1. Top cover, 2. Outer tube, 3. Base, 4. Piston rod, 5. Impact head, 6. Speed ​​control valve, 7. Adjusting screw, 8. Fixing screw, 9. Mounting hole, 10. Spindle. Detailed Implementation

[0019] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0020] like Figure 1-3 As shown, a buffer for a vacuum circuit breaker with a speed control valve 6 includes a body consisting of an upper cover 1, an outer tube 2, and a base 3. An inner tube, a piston, and a return spring are provided in the inner cavity of the body. The piston has a piston rod 4 that abuts against the return spring. The other end of the piston rod 4 extends upward through the upper cover 1 to form a strike head 5. The base 3 has a speed control valve 6 that communicates with the inner cavity of the body.

[0021] In another embodiment of the present invention, the speed control valve 6 includes an adjusting screw 7 and a fixing screw 8 that is tightly fitted with the adjusting screw 7.

[0022] In another embodiment of this utility model, the base 3 has mounting holes 9 for mounting and fixing the buffer.

[0023] In use, the main shaft 10 of the vacuum circuit breaker is brought into contact with the impact head 5, causing the impact head 5 and piston rod 4 to move up and down within the body. After the impact head 5 is compressed, it moves upward under the deformation force of the return spring. After moving to the required distance, it is limited by the upper cover 1. The damping of the buffer is adjusted by adjusting the adjusting screw 7 to change the energy absorbed by the buffer, thereby changing the time it takes for the moving contact to reach a 6mm stroke, thus achieving the purpose of adjusting the opening speed. The adjusting screw 7 is fixed in the preset position by adjusting the fixing screw 8. The speed adjustment principle is as follows. Figure 3 , Figure 3 In the circuit, the opening speed is 6 / T, where 6 is the stroke (mm) and T is the time it takes for the stroke to reach 6mm.

[0024] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A buffer for a vacuum circuit breaker with a speed regulating valve, characterized in that, The device includes a main body consisting of a top cover, an outer tube, and a base. An inner tube, a piston, and a return spring are disposed in the inner cavity of the main body. The piston has a piston rod that abuts against the return spring. The other end of the piston rod extends upward through the top cover to form a strike head. The base has a speed regulating valve that communicates with the inner cavity of the main body.

2. The buffer for a vacuum circuit breaker with a speed regulating valve according to claim 1, characterized in that, The speed control valve includes an adjusting screw and a fixing screw that fits tightly with the adjusting screw.

3. The buffer for a vacuum circuit breaker with a speed regulating valve according to claim 1, characterized in that, The base has mounting holes.

Images