A low-resistance and self-closing vacuum arc-extinguishing chamber contact structure and a preparation method thereof

Abstract

The application relates to a low-resistance and self-closing vacuum arc-extinguishing chamber contact structure which comprises a contact piece, a copper sliding block, a bellows, a contact cup and a high-temperature spring contact finger, the contact cup is hollowly arranged to form a cavity, the contact cup is provided with a cup opening which is communicated with the cavity; the contact piece and the cup opening are sealingly connected, the copper sliding block and the contact cup are slidingly connected, and the copper sliding block and the contact piece are arranged at intervals; the bellows and the high-temperature spring contact finger are sequentially sleeved on the outside of the copper sliding block, one end of the bellows is sealingly connected with the inner wall of the contact cup, the other end of the bellows is sealingly connected with the copper sliding block, and the bellows, the copper sliding block and the inner wall of the contact cup form a sealed gas chamber; the high-temperature spring contact finger is sleeved on the outside of the copper sliding block, and the copper sliding block and the high-temperature spring contact finger are slidingly connected. The application further comprises a preparation method of the low-resistance and self-closing vacuum arc-extinguishing chamber contact structure. The application solves the problems of a through-flow path of a contact closing and excessively high temperature rise and belongs to the technical field of vacuum arc-extinguishing chamber contacts.

Claims

1. A low-resistance, self-closing vacuum interrupter contact structure, characterized in that: The device includes a contact plate, a copper sliding block, a bellows, a contact cup, and a high-temperature spring contact finger. The contact cup is hollow, forming a cavity, and has a cup opening that communicates with the cavity. The contact plate and the cup opening are sealed together. The copper sliding block and the contact cup are slidably connected, with the copper sliding block located inside the cavity. The copper sliding block and the contact plate are spaced apart. The bellows and the high-temperature spring contact finger are sequentially fitted onto the outside of the copper sliding block. One end of the bellows is sealed to the inner wall of the contact cup, and the other end of the bellows is sealed to the copper sliding block. The bellows, the copper sliding block, and the inner wall of the contact cup form a sealed gas chamber. The high-temperature spring contact finger is fitted onto the outside of the copper sliding block, and the copper sliding block and the high-temperature spring contact finger are slidably connected. The high-temperature spring contact finger is located inside the sealed gas chamber. The copper sliding block includes a first sliding section and a second sliding section. One end of the first sliding section and one end of the second sliding section are fixedly connected. The other end of the bellows is sealed to one end of the first sliding section. The bellows and the high-temperature spring contact finger are sequentially sleeved on the outside of the second sliding section. The high-temperature spring contact finger is located at the other end of the second sliding section. The second sliding section and the high-temperature spring contact finger are slidably connected. The inner wall of the first sliding section, the bellows, and the contact cup forms a sealed air chamber. The second sliding section is located in the sealed air chamber. The other end of the first sliding section and the contact plate are spaced apart.

2. The low-resistance and self-closing vacuum interrupter contact structure according to claim 1, characterized in that: The distance between the other end of the first sliding section and the contact piece is 1-2 mm.

3. The low-resistance and self-closing vacuum interrupter contact structure according to claim 2, characterized in that: Both the first and second sliding sections are cylindrical structures, with the diameter of the first sliding section being larger than that of the second sliding section.

4. The low-resistance and self-closing vacuum interrupter contact structure according to claim 3, characterized in that: The cavity includes a first groove, a second groove, and a third groove, which are recessed inward from the mouth of the cup in sequence, and the cross-sections of the first groove, the second groove, and the third groove are all circular. The diameter of the first groove is larger than the diameter of the second groove, and the diameter of the second groove is larger than the diameter of the third groove; the diameter of the second sliding section is the same as the diameter of the third groove, and the second sliding section and the third groove are slidably connected; the outer diameter of the high-temperature spring contact finger is the same as the diameter of the second groove, the inner diameter of the high-temperature spring contact finger is the same as the diameter of the third groove, and the high-temperature spring contact finger is fixed in the second groove; one end of the bellows is sealed to the inner bottom wall of the first groove, and the outer diameter of the bellows is smaller than the diameter of the first groove.

5. The low-resistance and self-closing vacuum interrupter contact structure according to claim 4, characterized in that: The depth of the first groove is greater than the depth of the second groove, and the depth of the second groove is greater than the depth of the third groove.

6. The low-resistance and self-closing vacuum interrupter contact structure according to claim 1, characterized in that: The bellows is made of an elastic material.

7. The low-resistance and self-closing vacuum interrupter contact structure according to claim 1, characterized in that: The bellows and high-temperature spring contact fingers are coaxially arranged.

8. The low-resistance and self-closing vacuum interrupter contact structure according to claim 4, characterized in that: One end of the bellows is welded to the inner bottom wall of the first groove by argon arc welding, and the other end of the bellows is welded to one end of the first sliding section by argon arc welding.

9. A method for preparing a low-resistance and self-closing vacuum interrupter contact structure, the method being used to prepare the low-resistance and self-closing vacuum interrupter contact structure as described in claim 4, characterized in that, The preparation method includes the following steps: S1: The material for preparing the contact cup is processed by a milling machine and a lathe to obtain the contact cup; S2: Fix the high-temperature spring contact finger inside the contact cup; S3: Weld one end of the bellows to the inner bottom wall of the first groove using argon arc welding. The welding position and the top of the high-temperature spring contact finger are at the same level, so that one end of the bellows is sealed to the inner bottom wall of the first groove. S4: Place the copper sliding block inside the contact cup, and insert one end of the copper sliding block into the bellows and the high-temperature spring contact finger in sequence, so that the copper sliding block and the high-temperature spring contact finger slide and connect; weld the other end of the bellows to one end of the first sliding section by argon arc welding, so that the other end of the bellows is sealed to one end of the first sliding section. S5: Place a piece of silver-copper solder between the contact cup and the contact plate, and braze it in a vacuum atmosphere to obtain a low-resistance and self-closing vacuum interrupter contact structure.

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