CN-224217456-U - Moving contact of molded case circuit breaker

CN224217456UCN 224217456 UCN224217456 UCN 224217456UCN-224217456-U

Abstract

The utility model relates to a moving contact of a molded case circuit breaker, which comprises a moving contact frame, moving contact blades and connecting plates, wherein a rotating shaft is arranged in the moving contact frame, a plurality of moving contact blades are arranged in the moving contact frame in a penetrating manner, the rotating shaft penetrates through the rear ends of the moving contact blades, the front ends of the moving contact blades extend out of the moving contact frame, contacts are arranged below the top ends of the moving contact blades, the connecting plates are connected onto the rotating shaft and are tightly attached to the moving contact blades, a boss facing one side is formed on the moving contact blades, gaps are formed among the plurality of moving contact blades under the support of the boss, a plurality of connecting plates are respectively arranged at the two sides of the moving contact blades and in the gaps between the moving contact blades, the gaps are formed among the moving contact blades through the support of the boss, and the rear sides of the moving contact blades are kept in front and rear of the gaps through the connecting plates, so that the moving contact blades are favorable for heat dissipation, temperature rise is reduced, and service life is prolonged.

Inventors

Wen Hannan
GAO MING
DU XUEFENG
Wei Yitan
ZHANG WEI
ZHOU CAIYUN

Assignees

浙江科瑞普电气有限公司

Dates

Publication Date: 20260508
Application Date: 20250527

Claims (6)

1. The movable contact of the molded case circuit breaker comprises a movable contact frame, movable contact blades and connecting plates, wherein a rotating shaft is arranged in the movable contact frame, a plurality of movable contact blades are arranged in the movable contact frame in a penetrating mode in parallel, the rotating shaft penetrates through the rear ends of the movable contact blades, the front ends of the movable contact blades extend out of the movable contact frame, contacts are arranged below the top ends of the movable contact blades, the connecting plates are connected onto the rotating shaft and are tightly attached to the movable contact blades, and the molded case circuit breaker is characterized in that a boss facing one side is formed on the movable contact blades, gaps are formed among the plurality of movable contact blades under the support of the boss, and a plurality of connecting plates are respectively arranged in the gaps between two sides of the movable contact blades and the movable contact blades.
2. The movable contact of the molded case circuit breaker according to claim 1, wherein a tension spring is arranged in the movable contact frame, a tension spring rod is arranged at the bottom of the movable contact frame, the upper end of the tension spring is hung below a movable contact blade in the movable contact frame, and the lower end of the tension spring is hung on the tension spring rod.
3. The movable contact of the molded case circuit breaker according to claim 2, wherein the pull spring rods are equidistantly provided with pull spring grooves, and the lower ends of the pull springs are hung in the pull spring grooves.
4. The movable contact of the molded case circuit breaker according to claim 3, wherein the number of the tension springs mounted below each movable contact blade is 2, the number of the tension spring rods is 2, and the lower ends of the 2 tension springs are respectively hung on the 2 tension spring rods.
5. The movable contact of the molded case circuit breaker according to claim 1, wherein the rotating shaft is provided with a corrugated pad, and the corrugated pad is arranged between the connecting plate and the inner wall of the movable contact frame.
6. The movable contact of the molded case circuit breaker of claim 4, wherein the movable contact blade is provided with two tension spring holes, the upper ends of the tension springs are hung in the tension spring holes, and a triangular abdication groove for adapting the swing angle of the tension springs is formed below the tension spring holes.

Description

Moving contact of molded case circuit breaker Technical Field The utility model relates to the field of low-voltage electricity, in particular to a movable contact of a molded case circuit breaker. Background The plastic shell circuit breaker is a distribution electric appliance used in a power grid and is used for distributing electric energy, protecting a circuit and avoiding damage of electric equipment caused by overload and short circuit faults. The moving contact of the molded case circuit breaker is responsible for switching on and off a main circuit in the circuit breaker, when overload or short circuit occurs, high current can lead to rapid increase of temperature rise of the moving contact, and the existing multi-piece moving contact is large in size and slow in heat dissipation, so that the moving contact of the circuit breaker is easy to melt and adhere to a fixed contact, and cannot be normally disconnected, and certain potential safety hazards exist. Disclosure of Invention In order to overcome the defects, the utility model provides a movable contact of a molded case circuit breaker. In order to achieve the above purpose, the utility model adopts a moving contact of a molded case circuit breaker, which comprises a moving contact frame, moving contact blades and connecting plates, wherein a rotating shaft is arranged in the moving contact frame, a plurality of moving contact blades are arranged in the moving contact frame in a penetrating manner side by side, the rotating shaft penetrates through the rear end of the moving contact blade, the front end of the moving contact blade extends out of the moving contact frame, a contact is arranged below the top end of the moving contact blade, the connecting plates are connected onto the rotating shaft and are tightly attached to the moving contact blade, a boss facing one side is formed on the moving contact blade, a gap is formed between the moving contact blades under the support of the boss, and a plurality of connecting plates are respectively arranged at two sides of the moving contact blade and in a gap between the moving contact blades. Specifically, a tension spring is arranged in the movable contact frame, a tension spring rod is arranged at the bottom of the movable contact frame, the upper end of the tension spring is hung below a movable contact blade in the movable contact frame, and the lower end of the tension spring is hung on the tension spring rod. Particularly, the tension spring rods are provided with tension spring grooves at equal intervals, and the lower ends of the tension springs are hung in the tension spring grooves. In particular, the number of the tension springs mounted below each movable contact blade is 2, the number of tension spring rods is also 2, and the lower ends of the 2 tension springs are respectively hung on the 2 tension spring rods. Particularly, the rotating shaft is provided with a corrugated pad, and the corrugated pad is arranged between the connecting plate and the inner wall of the movable contact frame. In particular, two tension spring holes are formed in the movable contact blade, the upper ends of the tension springs are hung in the tension spring holes, and a triangular abdicating groove for adapting the swing angle of the tension springs is formed below the tension spring holes. The movable contact strip has the advantages that gaps are formed between the movable contact strips through boss support, the back of the movable contact strip is kept consistent front and back through the connecting plate, heat dissipation of the movable contact strip is facilitated, temperature rise is reduced, service life is prolonged, a tension spring is used for providing lower pressure for the movable contact, double rows of tension springs can ensure that the movable contact strip cannot incline to keep the contact balance of the movable contact strip, and a corrugated pad compresses the connecting plate and the movable contact strip to keep movable contact between the connecting plate and the movable contact strip. Drawings FIG. 1 is a schematic diagram of an embodiment of the present utility model. Fig. 2 is a top view of an embodiment of the present utility model. Fig. 3 is a bottom view of an embodiment of the present utility model. Fig. 4 is a cross-sectional view A-A of fig. 2. Fig. 5 is a schematic view of an embodiment of the present utility model with the moving contact frame removed. Detailed Description As shown in fig. 1 to 5, a moving contact of a molded case circuit breaker according to an embodiment of the present utility model includes a moving contact frame 1, a moving contact blade 2, and a connecting plate 3, wherein a rotating shaft 4 is disposed in the moving contact frame 1, a plurality of moving contact blades 2 are arranged in the moving contact frame 1 in a penetrating manner, the rotating shaft 4 is arranged at a rear end of the moving contact blade 2 in a penetrating manner, a moving