CN101162662A - Cyclone type nozzle high-pressure blowing circuit breakers with blades - Google Patents

Abstract

The invention discloses an air-swirl type spout high-voltage gas-blast circuit breaker with vanes, relating to the electrical switch field. The invention comprises a piston, an air cylinder, movable main contacts, movable arc contacts, stationary main contacts, stationary arc contacts and a spout; vanes are evenly arranged at the circumference of the inner wall of the upper part of the spout at which the spout and the movable arc contacts are formed into an air channel, so an air swirl area is formed. The axial movement of the air flow passing through the upper part of the spout is automatically converted into rotary movement, so the arc-extinguishing ability and the breaking capacity of the gas-blast circuit breaker are enhanced.

Description

Cyclone nozzle high pressure air blowing circuit breaker with vanes

technical field

The invention relates to a circuit breaker, in particular to a circuit breaker in which blades are added on the wall surface of a gas channel upstream of a nozzle to cause the arc blowing gas to automatically generate rotational movement.

Background technique

High-voltage circuit breakers mainly include oil circuit breakers and air-blown circuit breakers. Oil circuit breakers tend to be eliminated, and air-blown circuit breakers are divided into compressed air circuit breakers and self-powered circuit breakers according to the gas generation method. When the air blowing circuit breaker breaks the line, on the one hand, the contacts connected by the circuit breaker are separated, and at the same time, the high-pressure gas generated by the cylinder is required to extinguish the arc generated between the dynamic and static contacts, and improve the electric field resistance between the dynamic and static contacts. Breakdown ability to achieve the purpose of breaking the line. For all current air-blown circuit breakers, the arc blowing gas is in the form of blowing gas along the axial direction through the nozzle and along the contact gap of the circuit breaker after it comes out of the compressed air cylinder. If you want to continue to increase the breaking capacity of the circuit breaker, the traditional arc blowing method will have great difficulties, which is not conducive to greatly improving the resistance to electric field breakdown between contacts.

Contents of the invention

The object of the present invention is to provide a nozzle that improves the traditional axial blowing arc nozzle into a nozzle that realizes axial blowing arc+radial rotating arc blowing nozzle. Before the blowing gas blows to the arc, when it passes through the blade cyclone device, its axial movement is converted into a rotational movement, so as to improve the breaking capacity of the circuit breaker.

The technical solution adopted by the present invention to solve its technical problems is: comprising a piston, a pneumatic cylinder, a moving main contact, a moving arc contact, a static main contact, a static arc contact and a spout, forming a Blades are evenly distributed along the circumferential direction on the inner wall of the upstream nozzle of the air flow passage to form a whirl zone. The axial movement of the gas is converted into a rotational movement, and the blade material can be a non-conductive insulating material.

The invention has the advantages of simple structure, convenient implementation, making full use of the gas pressure difference during the breaking process, and automatically realizing the airflow rotation movement, so that the circuit breaker can increase the breaking capacity of the circuit breaker by using self-energy without increasing the volume.

Description of drawings

Fig. 1 is a schematic structural diagram of a circuit breaker in the prior art;

Fig. 2 is a schematic structural diagram of a circuit breaker of the present invention;

Fig. 3 is a sectional view of the nozzle of the circuit breaker in Fig. 2;

Fig. 4 is the left side view of Fig. 3;

In the figure: 1 piston, 2 pressure cylinder, 3 moving main contact, 4 moving arc contact, 5 static main contact, 6 static arc contact, 7 nozzle, 8 cyclone area, 9 blades.

Detailed ways

The structure and working principle of the present invention will be described in detail below in conjunction with the accompanying drawings.

It can be seen from the drawings that the pressure cylinder 2 is formed by the moving main contact 3 and the connecting piece, the moving arc contact 4 and the connecting piece and the piston 1, and the moving main contact 3 and the connecting piece, the moving arc contact 4 and the connecting piece are mechanically fixed , and linked together, the nozzle 7 is fixed on the moving main contact 3 and moves together with it, when the nozzle 7 moves to the left together with the moving main contact 3 and the moving arc contact 4, the moving arc contact 4 and the static arc The contact 6, the moving main contact 3 and the static main contact 5 are gradually separated, and the gas in the cylinder is pressed and moves in the direction of the arrow in the figure to blow the arc generated between the moving arc contact 4 and the static arc contact 6. Moving, in order to improve the blow-off ability, blades 9 are evenly distributed along the circumferential direction on the inner wall of the upstream nozzle of the airflow passage formed by the nozzle 7 and the moving arc contact 4, forming a cyclone area 8, and the gas in the compressed air cylinder 2 moves under pressure. At this time, as shown in Figure 2, the gas rotating motion is generated between the moving arc contact 4 and the static arc contact 6 and in the downstream area, which provides favorable assistance for the dissipation of the generated arc energy and the extinguishment of the arc. In addition, according to the working principle and design method of the present invention, different options for the number of blades, blade angles and blade sizes can be combined into various structural forms so as to be used in different structures of different circuit breakers.

Claims (1)

1. The high-pressure air-blown circuit breaker with a cyclone nozzle with blades includes a piston, a pneumatic cylinder, a moving main contact, a moving arc contact, a static main contact, a static arc contact and a nozzle. It is characterized in that the nozzle and The moving arc contact forms the inner wall of the upstream nozzle of the air flow channel, and blades are evenly distributed along the circumferential direction to form a cyclone area.

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