CN-122000228-A - Contact structure of longitudinal magnetic circuit breaker

CN122000228ACN 122000228 ACN122000228 ACN 122000228ACN-122000228-A

Abstract

The application relates to a contact structure of a longitudinal magnetic circuit breaker, which can solve the problem that the contact structure of the longitudinal magnetic circuit breaker in the related art is difficult to achieve good arc extinguishing effect and mechanical strength, the contact structure of the longitudinal magnetic circuit breaker comprises a contact cup, a screw mechanism and a contact blade, the contact cup is provided with a containing cavity and a cup opening, the screw mechanism is embedded in the containing cavity, the spiral mechanism is provided with at least 2 spiral grooves, the spiral grooves are spirally arranged around the axial direction of the contact cup, at least part of the spiral mechanism protrudes out of the cup mouth along the axial direction of the contact cup, the contact blade is propped against the spiral mechanism along the axial direction of the contact cup, and the contact blade is configured to compress the spiral mechanism along the axial direction of the contact cup until the contact blade is mutually propped against the cup mouth to limit.

Inventors

ZHU LU
ZHANG JIE
WANG YONG
LIU JUNXIANG
XIAO JUN
SONG HAOYONG
LI YIDA
CHEN YUQING

Assignees

广东电网有限责任公司广州供电局

Dates

Publication Date: 20260508
Application Date: 20260130

Claims (10)

1. A longitudinal magnetic circuit breaker contact structure, characterized in that the longitudinal magnetic circuit breaker contact structure comprises: The contact cup is provided with an accommodating cavity and a cup opening; The spiral mechanism is embedded in the accommodating cavity, is provided with at least 2 spiral grooves, is spirally arranged around the axial direction of the contact cup, and enables at least part of the spiral mechanism to protrude out of the cup rim along the axial direction of the contact cup; the contact blade is propped against the spiral mechanism along the axial direction of the contact cup, and the contact blade is configured to be capable of compressing the spiral mechanism along the axial direction of the contact cup until the contact blade is propped against the cup rim to limit.
2. The contact structure of a longitudinal magnetic circuit breaker according to claim 1, wherein a limiting part is arranged at the bottom of the contact cup in the accommodating cavity, the contact blade is connected with a limiting part, and the limiting part penetrates through the accommodating cavity and is clamped and limited with the limiting part.
3. The contact structure of a longitudinal magnetic circuit breaker according to claim 2, wherein the limiting part comprises a limiting cavity, the limiting cavity is provided with a limiting opening, the limiting part comprises an extending part and a limiting block, one end of the extending part is connected with the contact piece, the other end of the extending part is connected with the limiting block, the extending part penetrates through the limiting opening and enables the limiting block to be clamped in the limiting cavity, and the limiting block is movably arranged in the limiting cavity along the axial direction of the contact cup.
4. The contact structure of a longitudinal magnetic circuit breaker according to claim 3, wherein when the contact blade moves in a direction away from the cup opening so that the limiting block and the limiting cavity are mutually abutted and limited, a first preset distance is reserved between the limiting block and the bottom wall of the contact cup, and a second preset distance is reserved between the contact blade and the cup opening along the axial direction of the contact cup.
5. The longitudinal magnetic circuit breaker contact structure of claim 4, wherein the first predetermined pitch is equal to the second predetermined pitch.
6. The longitudinal magnetic circuit breaker contact structure according to claim 4, wherein the value range of the first preset spacing and/or the second preset spacing is 0.8mm-1.2mm.
7. The longitudinal magnetic circuit breaker contact structure according to claim 1, wherein the contact blade is provided with at least 2 first radial slots extending in a radial direction of the contact blade.
8. The contact structure of a longitudinal magnetic circuit breaker according to claim 1, wherein the contact cup is provided with a limit groove at the circumferential edge of the bottom in the accommodating cavity, and the screw mechanism is clamped in the radial direction of the contact cup and limits the limit groove.
9. The longitudinal magnetic circuit breaker contact structure according to claim 1, wherein the spiral mechanism comprises at least 2 spiral strips which are equidistantly arranged, the spiral strips are attached to the side wall of the contact cup in the accommodating cavity, and two ends of the spiral strips are respectively abutted to the bottom walls of the contact blade and the contact cup in the accommodating cavity.
10. The longitudinal magnetic circuit breaker contact structure according to claim 1, further comprising a conductive rod connected to an outer wall of a side of the contact cup facing away from the contact blade in an axial direction of the contact cup.

Description

Contact structure of longitudinal magnetic circuit breaker Technical Field The application relates to the technical field of high voltage electricity, in particular to a contact structure of a longitudinal magnetic circuit breaker. Background In the technical field of high voltage electricity, a longitudinal magnetic circuit breaker is a core device for guaranteeing safe operation of a power system by virtue of good control capability of a longitudinal magnetic field on an electric arc, and the performance of a contact structure of the longitudinal magnetic circuit breaker directly influences the arc extinguishing efficiency and the service life of the circuit breaker. In the related art, a spiral conductive path is generally directly processed on the wall of the contact cup so as to realize the magnetic field generating function of the contact cup. However, with the development of the power system towards high voltage and high current, when the number of spiral conductive paths is optimized, such as increasing the number of spiral grooves, to improve the magnetic field intensity, the mechanical strength of the contact cup can be weakened, so that the contact cup is easy to deform and crack under opening and closing impact, and if the supporting strength is ensured, the magnetic field is unevenly distributed, and the arc extinguishing effect is poor. Therefore, the contact structure of the longitudinal magnetic circuit breaker in the related art has difficulty in combining good arc extinguishing effect and mechanical strength. Disclosure of Invention Accordingly, it is necessary to provide a contact structure of a vertical magnetic circuit breaker in order to solve the problem that it is difficult to achieve both good arc extinguishing effect and mechanical strength in the contact structure of the vertical magnetic circuit breaker in the related art. The application provides a longitudinal magnetic circuit breaker contact structure, which comprises: The contact cup is provided with an accommodating cavity and a cup opening; The spiral mechanism is embedded in the accommodating cavity, is provided with at least 2 spiral grooves, is spirally arranged around the axial direction of the contact cup, and enables at least part of the spiral mechanism to protrude out of the cup rim along the axial direction of the contact cup; the contact blade is propped against the spiral mechanism along the axial direction of the contact cup, and the contact blade is configured to be capable of compressing the spiral mechanism along the axial direction of the contact cup until the contact blade is propped against the cup rim to limit. According to the contact structure of the longitudinal magnetic circuit breaker, the spiral mechanism is embedded in the accommodating cavity, so that the separation arrangement of the spiral mechanism for conducting electricity and the contact cup for supporting is facilitated, the contact blade is prevented from excessively compressing the spiral mechanism, the range of spiral ring setting of the spiral mechanism and the number of spiral grooves can be increased, and good arc extinguishing effect and mechanical strength of the spiral mechanism are achieved. In addition, the contact structure of the longitudinal magnetic circuit breaker is embedded in the accommodating cavity through the spiral mechanism, and the spiral groove is spirally arranged around the axial direction of the contact cup, so that a uniform longitudinal magnetic field is formed when current flows, an electric arc can be spirally diffused, the energy density of the electric arc is greatly reduced, and the arc extinguishing efficiency is improved. In addition, the contact structure of the longitudinal magnetic circuit breaker is beneficial to absorbing impact force through elastic deformation of the spiral mechanism when the circuit breaker is switched on by the arrangement that the contact blade is propped against the spiral mechanism along the axial direction of the contact cup, so that mechanical damage caused by rigid collision between the contact blade and the cup opening is avoided. In one embodiment, the bottom of the contact cup in the accommodating cavity is provided with a limiting part, the contact blade is connected with a limiting part, and the limiting part penetrates through the accommodating cavity and is in clamping limiting with the limiting part. In one embodiment, the limiting part comprises a limiting cavity, the limiting cavity is provided with a limiting opening, the limiting part comprises an extending part and a limiting block, one end of the extending part is connected with the contact blade, the other end of the extending part is connected with the limiting block, the extending part penetrates through the limiting opening and enables the limiting block to be clamped in the limiting cavity, and the limiting block is movably arranged in the limiting cavity along the axial direction of the contact cup. In