Moving contact of molded case circuit breaker

Abstract

The utility model relates to a moving contact of a molded case circuit breaker, which comprises a moving contact frame, a plurality of moving contact blades and a connecting plate, a rotating shaft is arranged in the moving contact frame, the plurality of moving contact blades are arranged in the moving contact frame side by side 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, and a contact point is arranged below the top end of each moving contact blade. The connecting plates are connected to the rotating shaft and are tightly attached to the moving contact blades, bosses facing one side are formed on the moving contact blades, gaps are formed among the plurality of moving contact blades under the support of the bosses, the plurality of connecting plates are respectively arranged on the two sides of the moving contact blades and in the gaps among the moving contact blades, gaps are formed among the moving contact blades through the support of the bosses, and the moving contact blades are connected with the connecting plates. The back of the moving contact piece keeps consistent front and back of the gap through the connecting plate, thereby facilitating the heat dissipation of the moving contact piece, reducing the temperature rise, and prolonging the service life.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage electrical equipment, specifically a moving contact of a molded case circuit breaker. Background Technology

[0002] A molded case circuit breaker (MCCB) is a power distribution device used in power grids to distribute electrical energy, protect lines, and prevent damage to electrical equipment from overload and short-circuit faults. The moving contact of the MCB is responsible for connecting and disconnecting the main circuit within the circuit breaker. In the event of an overload or short circuit, the large current causes a rapid increase in the temperature of the moving contact. Existing multi-plate moving contacts, due to their large size and slow heat dissipation, are prone to melting and sticking to the stationary contact, preventing proper disconnection and posing a safety hazard. Summary of the Invention

[0003] To address the aforementioned shortcomings, this utility model provides a moving contact for a molded case circuit breaker.

[0004] To achieve the above objectives, this utility model employs a moving contact of a molded case circuit breaker, comprising a moving contact frame, moving contact plates, and connecting plates. A rotating shaft is provided inside the moving contact frame, and multiple moving contact plates are arranged side by side within the moving contact frame. The rotating shaft passes through the rear end of the moving contact plates, and the front end of the moving contact plates extends out of the moving contact frame. A contact point is provided below the top of the moving contact plates. The connecting plates are connected to the rotating shaft and are tightly fitted to the moving contact plates. A boss facing one side is formed on the moving contact plates, and gaps are formed between the multiple moving contact plates under the support of the boss. Multiple connecting plates are respectively arranged on both sides of the moving contact plates and in the gaps between the moving contact plates.

[0005] Specifically, a tension spring is provided inside the moving contact frame, and a tension spring rod is provided at the bottom of the moving contact frame. The upper end of the tension spring is hung below the moving contact piece inside the moving contact frame, and the lower end is hung on the tension spring rod.

[0006] Specifically, the tension spring rod is provided with tension spring grooves at equal intervals, and the lower end of the tension spring is hung in the tension spring groove.

[0007] Specifically, each of the moving contact pieces has two tension springs hanging below it, and two tension spring rods, with the lower ends of the two tension springs hanging on the two tension spring rods respectively.

[0008] Specifically, a corrugated pad is provided on the rotating shaft, and the corrugated pad is disposed between the connecting plate and the inner wall of the moving contact frame.

[0009] Specifically, the moving contact piece is provided with two tension spring holes, the upper end of the tension spring is hung in the tension spring hole, and a triangular relief groove is formed below the tension spring hole to allow the tension spring to swing angle to be adapted.

[0010] The beneficial effects of this utility model are that the moving contact pieces are supported by bosses to form a gap, and the gap is kept consistent at the rear by a connecting plate, which is conducive to heat dissipation of the moving contact pieces, reduces temperature rise, and improves service life; a tension spring is used to provide downward pressure to the moving contact, and the double-row tension springs can ensure that the moving contact pieces will not tilt and maintain the contact balance of the moving contact pieces; a corrugated pad presses the connecting plate and the moving contact pieces to maintain the movable contact between the connecting plate and the moving contact pieces. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of a specific embodiment of the present utility model.

[0012] Figure 2 This is a top view of a specific embodiment of the present utility model.

[0013] Figure 3 This is a bottom view of a specific embodiment of the present utility model.

[0014] Figure 4 yes Figure 2 AA sectional view.

[0015] Figure 5 This is a schematic diagram of a specific embodiment of the present invention after removing the moving contact head frame. Detailed Implementation

[0016] like Figures 1-5 As shown, a specific embodiment of this utility model is a moving contact of a molded case circuit breaker, including a moving contact frame 1, a moving contact piece 2, and a connecting plate 3. A rotating shaft 4 is provided inside the moving contact frame 1. Multiple moving contact pieces 2 are arranged side by side inside the moving contact frame 1. The rotating shaft 4 passes through the rear end of the moving contact piece 2. The front end of the moving contact piece 2 extends out of the moving contact frame 1. A contact point 5 is provided below the top of the moving contact piece 2. The connecting plate 3 is connected to the rotating shaft 4 and is tightly fitted to the moving contact piece 2. A boss 21 facing one side is formed on the moving contact piece 2. A gap 22 is formed between the multiple moving contact pieces 2 under the support of the boss 21. Multiple connecting plates 3 are respectively arranged on both sides of the moving contact piece 2 and in the gap 22 between the moving contact pieces 2. A corrugated pad 6 is provided on the rotating shaft 4. The corrugated pad 6 is arranged between the connecting plate 3 and the inner wall of the moving contact frame 1.

[0017] A tension spring 7 is installed inside the moving contact frame 1. Two tension spring rods 8 are installed at the bottom of the moving contact frame 1. Two tension spring holes 23 are provided on the moving contact plate 2. The upper ends of the two tension springs 7 are hung in the two tension spring holes 23 below the moving contact plate 2. A triangular relief groove 24 is formed below the tension spring holes 23 to allow the swing angle of the tension springs 7 to be adapted. Tension spring grooves 81 are provided at equal intervals on the tension spring rods 8. The lower ends of the two tension springs 7 are respectively hung in the corresponding tension spring grooves 81 of the two tension spring rods 8.

[0018] The preferred embodiments of the present invention described above are examples of the present invention. Other obvious variations or combinations are also within the scope of protection of the claims.

Claims

1. A moving contact of a molded case circuit breaker, comprising a moving contact frame, moving contact plates, and a connecting plate, wherein a rotating shaft is disposed within the moving contact frame, multiple moving contact plates are arranged side-by-side within the moving contact frame, the rotating shaft passes through the rear end of the moving contact plates, the front end of the moving contact plates extends out of the moving contact frame, a contact point is disposed below the top end of the moving contact plates, and the connecting plate is connected to the rotating shaft and tightly fitted with the moving contact plates, characterized in that: A boss facing one side is formed on the moving contact piece, and a gap is formed between multiple moving contact pieces under the support of the boss. Multiple connecting plates are respectively arranged on both sides of the moving contact piece and in the gap between the moving contact pieces.

2. The moving contact of the molded case circuit breaker according to claim 1, characterized in that: A tension spring is installed inside the moving contact frame, and a tension spring rod is installed at the bottom of the moving contact frame. The upper end of the tension spring is hung below the moving contact piece inside the moving contact frame, and the lower end is hung on the tension spring rod.

3. The moving contact of the molded case circuit breaker according to claim 2, characterized in that: The tension spring rod has tension spring grooves at equal intervals, and the lower end of the tension spring is hung in the tension spring groove.

4. The moving contact of the molded case circuit breaker according to claim 3, characterized in that: Each of the moving contact pieces has two tension springs hanging below it, and two tension spring rods. The lower ends of the two tension springs are respectively hung on the two tension spring rods.

5. The moving contact of the molded case circuit breaker according to claim 1, characterized in that: A corrugated pad is provided on the rotating shaft, and the corrugated pad is located between the connecting plate and the inner wall of the moving contact frame.

6. The moving contact of the molded case circuit breaker according to claim 4, characterized in that: The moving contact piece is provided with two tension spring holes, the upper end of the tension spring is hung in the tension spring hole, and a triangular relief groove is formed below the tension spring hole to allow the tension spring to swing angle to be adapted.

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