Three-phase AC (Alternating Current) high-voltage vacuum contactor with long service life

Abstract

The invention discloses a three-phase AC (Alternating Current) high-voltage vacuum contactor with a long service life, which can achieve 24kV voltage class and meet the requirements on one million-time mechanical life of a contactor. The three-phase AC high-voltage vacuum contactor with the long service life comprises a vacuum arc extinguish chamber arranged in an up-and-down structure, a soft connector, an insulating pull rod and a brake separating spring. A casing of the vacuum arc extinguish chamber is an integrated cylinder, the inner periphery of a shielding cylinder is provided with a convex ring of which the inner diameter is matched with the external diameter of the shielding cylinder, and the outer periphery of the shielding cylinder is connected with the inner periphery of the convex ring in a hermetic seal way; the radius of a wave trough of a corrugated tube is identical to that of a wave crest of the corrugated tube; the soft connector is formed by overlapping, tightly pressing and flattening a plurality of copper foil tapes with identical width and length; the insulating pull rod comprises a mandril of which the two ends are respectively provided with a blind hole, a connecting piece embedded in the blind holes of the mandril and an insulating sleeve sleeved outside the mandril in an attaching way, and the middle part of the outside surface of the insulating sleeve is provided with a plurality of layers of skirt rims at equal intervals; and a spring seat and a spring support seat of the brake separating spring are respectively and detachably installed on an armature and a substrate.

Description

technical field [0001] The invention relates to a long-life three-phase AC high-voltage vacuum contactor. Background technique [0002] The vacuum contactor is used to frequently turn on and off the normal working current, and perform frequent operations under a certain load current. Generally, in the field of three-phase AC high-voltage vacuum contactors, the rated voltage of vacuum contactors is up to 12kV, and the use occasion is normal indoor use environment. Because the core components and other components in this type of vacuum contactor still have some defects, The mechanical life of the contactor can only be up to 500,000-600,000 times. Since rail transit is a new type of transportation facility, it has special requirements for the traction power supply system, and it is installed indoors with high temperature and high humidity. The voltage level of the three-phase AC high-voltage vacuum contactor in the system needs to reach 24KV, and the mechanical life must reac...

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Problems solved by technology

[0004] 1) In the fixed structure of the shielding cylinder and the ceramic insulator in the vacuum interrupter, the cost of the parts is high, and the assembly requires a special mold to position the shielding cylinder and seal the parts, making the production cycle longer; the connection at both ends of the ceramic insulator In the structure, the mold needs to be sealed to ensure the coaxiality of the whole tube, so the amount of packaging in a single furnace is small; the trough of the corrugated tube is small and the crest is large, which makes the fatigue resistance of the trough low, thus reducing the fatigue life of the corrugated tube reduce

[0005] 2) The soft connection is braided into a strip with a certain width and thickness by using multiple thin copper wires. The soft connection of this structure is not suitable for long-term and repeated working methods, and the thin copper wires are easy to break, and the processing cost is also high

[0006] 3) Insulation tie rods are mostly light rod structures. Although their weight is lighter, the creepage distance is small; there are skirt structures, although the creepage distance increases, but the quality is increased.

[0007] 4) The opening spring in the operating mechanism needs to be manually compressed with a lot of effort during installation, and then sandwiched between the armature and the base plate. The compression and release of the spring are uneven, which reduces the force of the spring; and it is easy to The spring is deformed during operation, which cannot meet the requirements of frequent operation; in addition, the spring is wound with ordinary carbon steel wire, which will generate a shunt magnetic field under the action of the magnetic field, which will affect the normal operation of the contactor

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