CN-121983476-A - Multi-break type high breaking type miniature circuit breaker

CN121983476ACN 121983476 ACN121983476 ACN 121983476ACN-121983476-A

Abstract

The invention is suitable for the technical field of low-voltage appliances, and relates to a multi-breaking-point type high-breaking-type miniature circuit breaker which comprises a shell, an operating mechanism, a contact mechanism and an arc extinguishing mechanism, wherein the operating mechanism is arranged in the shell and used for realizing switching-on and switching-off operations of the circuit breaker, the contact mechanism is connected with the operating mechanism and comprises a wire inlet contact and a wire outlet contact which can move relatively, the arc extinguishing mechanism is arranged on one side of the contact mechanism and used for extinguishing an electric arc, the operating mechanism comprises a free tripping mechanism and a switching-on and switching-off accelerating mechanism, the free tripping mechanism comprises a tripping buckle and a lock catch, a rotating shaft is arranged on the lock catch, and the switching-on and switching-off accelerating mechanism is configured to convert low-speed motion input by manual operation into high-speed switching-on and switching-off motions of the contact mechanism. The invention has the functions of high breaking capacity, high insulation voltage, long electric life, excellent synchronism and visual state, and is especially suitable for AC/DC power distribution occasions with high requirements.

Inventors

WANG YUNFEI
DAI XUYI
ZHAO GANG

Assignees

惟远能源技术股份有限公司

Dates

Publication Date: 20260505
Application Date: 20260409

Claims (10)

1. A multi-break high breaking miniature circuit breaker is characterized by comprising a shell; The operating mechanism is arranged in the shell and is used for realizing the switching-on and switching-off operation of the circuit breaker; The contact mechanism is connected with the operating mechanism and comprises a wire inlet contact and a wire outlet contact which can move relatively; The arc extinguishing mechanism is arranged at one side of the contact mechanism and is used for extinguishing an arc; The operating mechanism comprises a free tripping mechanism and a switching-on and switching-off accelerating mechanism, the free tripping mechanism comprises a tripping button and a locking button, a rotating shaft is arranged on the locking button, and the switching-on and switching-off accelerating mechanism is configured to convert low-speed motion input by manual operation into high-speed switching-on and switching-off motion of the contact mechanism.
2. The multi-break high breaking type miniature circuit breaker according to claim 1, wherein the breaking accelerating mechanism comprises a handle, a fan-shaped trip gear and an accelerating gear, the handle is used for receiving manual operation, the fan-shaped trip gear is linked with the handle, a kidney-shaped hole and an incomplete gear are arranged on the fan-shaped trip gear, the rotating shaft is arranged in the kidney-shaped hole in a penetrating mode, the accelerating gear is meshed with the incomplete gear, and the number of teeth of the accelerating gear is smaller than that of teeth of the incomplete gear, so that acceleration transmission is achieved.
3. A multi-break high breaking miniature circuit breaker according to claim 2 wherein said contact mechanism comprises a rack and a contact support, said rack engaging said acceleration gear, said contact support fixedly connected to said rack, said incoming contact and outgoing contact being disposed on said contact support such that said incoming contact and outgoing contact are movable in opposition during a breaking operation to effect a doubling of the opening distance.
4. A multi-break high breaking miniature circuit breaker according to claim 3 wherein a slide rail is provided in the housing, and a slide slot is provided on the contact support for mating with the slide rail to allow smooth movement of the contact support along the slide rail.
5. A multi-break high breaking miniature circuit breaker according to claim 1, further comprising a secondary contact mechanism comprising a primary contact and a secondary contact, said secondary contact being arranged on one side of said primary contact and being electrically connected to said primary contact, said secondary contact being of resilient metal, being in contact with said primary contact during closing and being separated later than said primary contact during opening for preferentially withstanding arc ablation.
6. The multi-break high breaking miniature circuit breaker according to claim 5, wherein said arc extinguishing mechanism comprises an independent arc extinguishing chamber and an arc extinguishing chamber, said independent arc extinguishing chamber is physically isolated from said operating mechanism by a partition plate, said arc extinguishing chamber is disposed on both sides of said auxiliary contact, and a plurality of arc extinguishing pieces are disposed in said arc extinguishing chamber for cutting and cooling the arc.
7. A multi-break high breaking miniature circuit breaker according to claim 6 wherein the side wall of the arc chute is provided with an arc nozzle and the housing is provided with an arc discharge opening in communication with the arc chute for directing and exhausting the arc gases.
8. A multi-break high breaking miniature circuit breaker according to claim 1, further comprising a break-in and break-out contact mechanism, said break-in and break-out contact mechanism comprising a cylindrical spring disposed within said contact mechanism, said cylindrical spring being compressed for energy storage during closing, providing contact pressure to the contacts, said cylindrical spring releasing energy upon break-in triggering, accelerating contact separation.
9. A multi-break high breaking miniature circuit breaker according to claim 1, characterized in that said housing is provided with a transparent window for observing the wear of said contact means.
10. A multi-break high breaking miniature circuit breaker according to claim 9 wherein said housing is further provided with incoming and outgoing terminals wired to incoming and outgoing sides of said operating mechanism, respectively.

Description

Multi-break type high breaking type miniature circuit breaker Technical Field The invention belongs to the technical field of piezoelectric devices, and particularly relates to a multi-breaking-point type high breaking-type miniature circuit breaker. Background Along with the popularization of high-voltage alternating-current and direct-current power distribution and diversified load scenes, a three-stage power distribution system has higher requirements on the performance of a miniature circuit breaker. The traditional miniature circuit breaker has the defects that the traditional miniature circuit breaker is small in opening size, can only meet the application requirement of a single load of the traditional AC400V rated current 63A, restricts the improvement of rated insulation voltage of a product, is low in closing speed, poor in carrying operation performance, mainly concentrated on contacts in arc ablation, greatly shortened in service life and free of a contact visual function, and is obvious in arc ablation phenomenon and long in service life due to the fact that the contact wear difference is large due to the fact that the difference of manual speed is caused when the traditional miniature circuit breaker is manually opened and closed. The patent application with the publication number of CN210073739U provides a prepayment miniature circuit breaker, wherein a strip-shaped groove with a wiring lug is arranged on a shell of the miniature circuit breaker, a speed reduction executing mechanism and a double-layer circuit board are arranged on a shell seat one by one in a prepayment functional module, the speed reduction executing mechanism is driven by a miniature motor, a trip gear and a clutch shaft thereof adopt a clutch structure, an operating handle and the clutch shaft are linked through a handle linkage rod, and a trip gear is matched with a trip toggle rod to drive a quick opening tripping mechanism of the miniature circuit breaker. Although the quick opening is realized in the patent application, the arc ablation condition of the contact is still invisible, and the same disadvantages as the prior art exist. Therefore, how to provide a multi-breaking-type high breaking-type miniature circuit breaker to improve the insulating performance, breaking capacity, switching-on and switching-off speed, synchronism, electrical life and maintainability of a product is a problem to be solved by the person skilled in the art. Disclosure of Invention Aiming at the defects of the prior art, the invention aims to provide a multi-breaking-type high breaking type miniature circuit breaker so as to solve the problems of lower insulating property, breaking capacity, switching-on and switching-off speed, synchronism, electric service life and maintainability of the circuit breaker in the prior art. In order to solve the technical problems, the invention adopts the following technical scheme: The invention provides a multi-breaking-type high breaking-type miniature circuit breaker, which comprises a shell; The operating mechanism is arranged in the shell and is used for realizing the switching-on and switching-off operation of the circuit breaker; The contact mechanism is connected with the operating mechanism and comprises a wire inlet contact and a wire outlet contact which can move relatively; The arc extinguishing mechanism is arranged at one side of the contact mechanism and is used for extinguishing an arc; The operating mechanism comprises a free tripping mechanism and a switching-on and switching-off accelerating mechanism, the free tripping mechanism comprises a tripping button and a locking button, a rotating shaft is arranged on the locking button, and the switching-on and switching-off accelerating mechanism is configured to convert low-speed motion input by manual operation into high-speed switching-on and switching-off motion of the contact mechanism. Further, the on-off acceleration mechanism comprises a handle, a fan-shaped trip gear and an acceleration gear, wherein the handle is used for receiving manual operation, the fan-shaped trip gear is linked with the handle, a kidney-shaped hole and an incomplete gear are arranged on the fan-shaped trip gear, the rotating shaft is arranged in the kidney-shaped hole in a penetrating mode, the acceleration gear is meshed with the incomplete gear, and the number of teeth of the acceleration gear is smaller than that of teeth of the incomplete gear, so that acceleration transmission is achieved. Further, the contact mechanism comprises a rack and a contact support, the rack is meshed with the accelerating gear, the contact support is fixedly connected with the rack, and the incoming contact and the outgoing contact are arranged on the contact support, so that the incoming contact and the outgoing contact can move in opposite directions during opening operation, and opening multiplication is achieved. Further, a sliding rail is arranged in the shell, and a slidin