Molded case circuit breaker contact assembly

Abstract

The utility model relates to a molded case circuit breaker contact assembly. The technical problem to be solved by the utility model is to provide a molded case circuit breaker contact assembly. According to the technical scheme, the static contact device comprises a static contact support assembly, a static contact assembly, a contact external connection plate and a flexible connection wire, the static contact assembly comprises a static contact, and the static contact support assembly comprises a static contact support, a connection shaft fixed on the static contact support, a spring seat block and a pre-tightening spring. The static contact comprises a static contact bearing part and a static contact rotating part, the static contact rotating part is provided with a static contact through hole, and the static contact rotating part is fixed on the static contact support in a swinging manner. Compared with the prior art, the contact assembly has the advantages that the static contact adopts a micro swing type design, so that a part of impact force can be removed through micro swing at the contact moment of the static contact and the moving contact, the excessive loss of the impact force to the contact point of the static contact is obviously reduced, and the service life of the contact assembly is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to a molded case circuit breaker contact assembly. BACKGROUND

[0002] The molded case circuit breaker is generally composed of a contact system, an arc extinguishing system, an operating mechanism, a tripping device and a shell, and the static contact assembly is a key component inside the molded case circuit breaker. The conventional molded case circuit breaker contact assembly adopts a swing design for the moving contact part and a fixed structure design for the static contact assembly. Since a large impact force is required to ensure the stability of the contact when the moving contact and the static contact are in contact, this design will cause the contact point to bear a huge mechanical impact and arc impact in the frequent opening and closing process, thereby accelerating the wear and ablation of the contact point and significantly reducing the service life of the contact. The conventional static contact assembly lacks a special arc guiding structure, and the arc is easy to concentrate at the contact point joint when the contacts are separated, which causes the contact point material to be rapidly oxidized and burned, reduces the breaking capacity and service life of the contact, and increases the maintenance frequency. SUMMARY

[0003] To solve the above problems, the technical problem to be solved by the utility model is to provide a molded case circuit breaker contact assembly.

[0004] The utility model discloses a molded case circuit breaker contact assembly adopts the technical scheme: including static contact support assembly, static contact assembly, contact external plate, the soft connection wire that connects up the contact external plate with static contact assembly, its characterized in be static contact assembly includes static contact, static contact support assembly includes static contact support, the connecting shaft that is fixed on static contact support, spring seat block and pre-tightening spring, static contact includes static contact receiving part and static contact rotating part, static contact rotating part is equipped with static contact through -hole for the connecting shaft to wear and set, static contact rotating part can swing and be fixed on static contact support, static contact rotating part bottom is equipped with with static contact receiving part vertical static contact limiting protrusion that sets up.

[0005] Static contact support includes support bottom plate, the support bottom plate four quarters are vertically bent upwards and form respectively form static contact assembly static state limiting support front baffle, support side plate and support back plate, support front baffle is used for static contact limiting protrusion front limiting, support front baffle is equipped with front baffle limiting mouth for static contact left and right limiting, spring seat block is fixed in support back plate inboard, spring seat block is equipped with seat block positioning groove, pre-tightening spring is placed in seat block positioning groove and its front end is resisted in static contact rotating part rear part.

[0006] Static contact rotating part rear part is equipped with rotating part positioning groove for preventing pre-tightening spring front end swing and falling off.

[0007] The spring seat block bottom is provided with a spring seat block anti-moving protrusion, and the support bottom plate is provided with a support bottom plate limiting opening corresponding to the spring seat block anti-moving protrusion.

[0008] The static contact assembly further comprises a static contact point and a static contact cover, and an upper end surface of the static contact receiving part is provided with a static contact point fixing groove for receiving the static contact point after welding.

[0009] The static contact cover is internally provided with a cover built-in opening for covering the static contact receiving part outside, and a front end of the static contact cover is further provided with a cover surrounding edge for limiting the side of the static contact point.

[0010] The number of the pre-tightening spring, the seat block positioning groove and the rotating part positioning groove is 2.

[0011] The static contact adopts a micro swing type design, so that a part of impact force can be unloaded through micro swing at the moment of contact between the static contact and the moving contact, the excessive loss of the impact force to the static contact point is significantly reduced, and the service life of the contact assembly is prolonged; the structure design of the static contact support can accurately control the swing range of the static contact, avoids unstable contact or damage of the static contact due to excessive swing, and improves the reliability of the contact system; the design of the spring seat block and the pre-tightening spring enables the static contact to quickly and closely contact the moving contact after micro swing. BRIEF DESCRIPTION OF DRAWINGS

[0012] The utility model will be further explained in detail in combination with the drawings and specific embodiments.

[0013] Figure 1 is the structure schematic diagram of the molded case circuit breaker contact assembly of the utility model;

[0014] Figure 2 is the structure schematic diagram of the static contact assembly of the utility model;

[0015] Figure 3 is the exploded view of the static contact support assembly of the utility model;

[0016] Figure 4 is the structure schematic diagram of the static contact of the utility model;

[0017] Figure 5 is the structure schematic diagram of the static contact support of the utility model;

[0018] Figure 6 is the structure schematic diagram of the spring seat block of the utility model;

[0019] Figure 7 is the structure schematic diagram of the static contact cover of the utility model. DETAILED DESCRIPTION

[0020] like Figures 1-7 As shown, the contact assembly of the molded case circuit breaker involved in this utility model includes a stationary contact support assembly 1, a stationary contact assembly 2, a contact outer plate 3, and a flexible connecting wire 4 connecting the contact outer plate 3 and the stationary contact assembly 2. The stationary contact assembly 2 includes a stationary contact 6. The stationary contact support assembly 1 includes a stationary contact support 10, a connecting shaft 11 fixed on the stationary contact support 10, a spring seat block 12, and a preload spring 13. The stationary contact 6 includes a stationary contact receiving part 15 and a... A stationary contact rotating part 16 is provided with a stationary contact through hole 17 for the connecting shaft 11 to pass through. The stationary contact rotating part 16 is swayably fixed on the stationary contact bracket 10. The bottom of the stationary contact rotating part 16 is provided with a stationary contact limiting protrusion 18 that is perpendicular to the stationary contact receiving part 15. The stationary contact bracket 10 includes a bracket base plate 20. The bracket base plate 20 is bent vertically upwards around its four sides to form respective positions for the stationary contact assembly 2. The bracket includes a front baffle 21, a side plate 22, and a rear plate 23 for limiting the position of the stationary contact 6. The front baffle 21 is used to limit the front of the stationary contact limiting protrusion 18. The front baffle 21 is provided with a front baffle limiting opening 24 for limiting the left and right positions of the stationary contact 6. The spring seat block 12 is fixed inside the rear plate 23. The spring seat block 12 is provided with a seat block positioning groove 25. The preload spring 13 is placed in the seat block positioning groove 25 and its front end abuts against the stationary contact rotation. At the rear of the moving part 16, the stationary contact 6 adopts a micro-oscillation design, which allows the stationary contact 6 to dissipate part of the impact force through micro-oscillation at the moment of contact with the moving contact, thereby reducing excessive wear of the impact force on the stationary contact point 7 and thus improving its service life; the structure of the stationary contact support 10 plays a precise role in limiting the oscillation of the stationary contact 6, allowing it to move micro-moves within a controllable range; the spring seat block 12 and the preload spring 13 enable the stationary contact 6 to quickly maintain close contact with the moving contact after micro-oscillation, making the contact tight and reliable.

[0021] The rear part of the stationary contact rotating part 16 is provided with a rotating part positioning groove 26 to prevent the front end of the preload spring 13 from falling off when it swings.

[0022] The bottom of the spring seat block 12 is provided with a spring seat block anti-displacement protrusion 28, and the bracket base plate 20 is provided with a bracket base plate limiting port 29 corresponding to the spring seat block anti-displacement protrusion 28, which ensures the stability of the spring seat block 12 and avoids displacement problems caused by vibration or impact.

[0023] The stationary contact assembly 2 also includes a stationary contact point 7 and a stationary contact cover 8. The upper end face of the stationary contact receiving part 15 is provided with a stationary contact fixing groove 31 for receiving the stationary contact point 7 after welding, which facilitates the welding and fixing of the stationary contact point 7.

[0024] The static contact outer cover 8 is provided with an outer cover built-in opening 32 for covering the static contact receiving part 15, and the static contact outer cover 8 is further provided with an outer cover surrounding edge 33 for limiting the side of the static contact point 7, which can strengthen the limitation of the static contact point 7 and ensure the stability of the contact, and can also assist in auxiliary arc striking and reduce the influence of the arc on the static contact point 7.

[0025] The number of the pre-tightening spring 13, the seat block positioning groove 25 and the rotating part positioning groove 26 is two, which further enhances the stability of the structure.

[0026] The above only describes the preferred embodiments of the present application, and is not intended to limit the present application, and any modification, equivalent replacement and improvement within the spirit and principle of the present application are included in the protection scope of the present application.

Claims

1. A contact assembly for a molded case circuit breaker, comprising a stationary contact support assembly (1), a stationary contact assembly (2), a contact outer plate (3), and a flexible connecting wire (4) connecting the contact outer plate (3) and the stationary contact assembly (2), characterized in that: The stationary contact assembly (2) includes a stationary contact (6), and the stationary contact support assembly (1) includes a stationary contact support (10), a connecting shaft (11) fixed on the stationary contact support (10), a spring seat block (12) and a preload spring (13). The stationary contact (6) includes a stationary contact receiving part (15) and a stationary contact rotating part (16). The stationary contact rotating part (16) is provided with a stationary contact through hole (17) for the connecting shaft (11) to pass through. The stationary contact rotating part (16) is swayably fixed on the stationary contact support (10). The bottom of the stationary contact rotating part (16) is provided with a stationary contact limiting protrusion (18) that is perpendicular to the stationary contact receiving part (15). The stationary contact bracket (10) includes a bracket base plate (20). The bracket base plate (20) is bent vertically upward around its perimeter to form a bracket front baffle (21), a bracket side plate (22), and a bracket rear plate (23) for limiting the stationary contact assembly (2) in a stationary state. The bracket front baffle (21) is used to limit the front of the stationary contact limiting protrusion (18). The bracket front baffle (21) is provided with a front baffle limiting port (24) for limiting the left and right sides of the stationary contact (6). The spring seat block (12) is fixed inside the bracket rear plate (23). The spring seat block (12) is provided with a seat block positioning groove (25). The preload spring (13) is placed in the seat block positioning groove (25) and its front end abuts against the rear of the stationary contact rotating part (16).

2. The molded case circuit breaker contact assembly according to claim 1, characterized in that: The rear part of the stationary contact rotating part (16) is provided with a rotating part positioning groove (26) to prevent the front end of the preload spring (13) from falling off when it swings.

3. The molded case circuit breaker contact assembly according to claim 1, characterized in that: The bottom of the spring seat block (12) is provided with a spring seat block anti-slip protrusion (28), and the bracket base plate (20) is provided with a bracket base plate limiting port (29) corresponding to the spring seat block anti-slip protrusion (28).

4. The molded case circuit breaker contact assembly according to claim 1, characterized in that: The stationary contact assembly (2) also includes a stationary contact point (7) and a stationary contact cover (8). The upper end face of the stationary contact receiving part (15) is provided with a stationary contact fixing groove (31) for receiving the stationary contact point (7) after welding.

5. The molded case circuit breaker contact assembly according to claim 4, characterized in that: The stationary contact cover (8) is provided with an inner opening (32) for covering the stationary contact receiving part (15), and the front end of the stationary contact cover (8) is also provided with a cover edging (33) for limiting the side of the stationary contact point (7).

6. The molded case circuit breaker contact assembly according to claim 2, characterized in that: The number of the preload spring (13), the seat block positioning groove (25), and the rotating part positioning groove (26) are all two.

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