Special-shaped static contact of large-current circuit breaker

Abstract

The utility model belongs to the field of circuit breakers, and particularly relates to a special-shaped static contact of a large-current circuit breaker, which comprises a static contact body arranged in a base, one end of the static contact body is provided with a contact part, the contact part is provided with a static contact point, and the other end of the static contact body is provided with a wire inlet wiring part. The incoming line wiring part is provided with a wiring hole for connecting a wiring bolt, the incoming line wiring part is higher than the contact part, a transition connection part is connected between the contact part and the incoming line wiring part, and the incoming line wiring part is as high as the outgoing line end of the circuit breaker; the static contact body is designed to be of a special-shaped structure, the contact part lifts the height of the wire inlet and wiring part through the transition connecting part, the height of the wire inlet and wiring part is made to be consistent with the height of the wire outlet end of the circuit breaker, and the situation that wiring of wire inlet and outlet wiring screws is reversely installed can be effectively avoided. The special-shaped structure of the static contact body is more flexible to form, and the mechanical performance and the conductive performance of the static contact are improved.

Description

Technical Field

[0001] This utility model belongs to the field of circuit breaker technology, specifically relating to an irregularly shaped stationary contact of a high-current circuit breaker. Background Technology

[0002] Molded case circuit breakers (MCCBs) are important electrical devices primarily used to protect circuits and equipment from overloads, short circuits, and other faults. Their core function is to automatically cut off the current when it exceeds a set value, thereby preventing equipment damage or potential fire hazards.

[0003] Existing high-current molded case circuit breakers (1250A) require large cross-sectional areas (and thicker thickness) for their high-current stationary contacts. Bending these contacts requires extremely high tonnage pressure, which easily leads to cracks or stress concentration, significantly affecting the conductivity of the stationary contacts. Therefore, most existing high-current stationary contacts adopt a straight-plate (straight-plate shape) design. However, this straight-plate stationary contact structure easily creates a height difference between the circuit breaker's input end (stationary contact terminal) and output end (the copper busbar electrically connected to the moving contact). During wiring, the matching bolt lengths for the input and output ends are also different. Workers easily install the bolts in reverse during assembly, resulting in poor contact between the bolts and the input / output ends, or even damage to the circuit breaker's insulation (base), affecting the product's dielectric properties. Furthermore, this structural design results in poor temperature rise performance for the stationary contacts, potentially leading to overheating during prolonged operation, affecting product stability and lifespan. Summary of the Invention

[0004] The purpose of this utility model is to overcome the shortcomings and deficiencies of the existing technology and to provide a special-shaped static contact of a circuit breaker that has good conductivity, low temperature rise, and can effectively avoid reverse wiring of the incoming and outgoing line screws.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A non-circuitous contact of a high-current circuit breaker includes a stationary contact body disposed in a base. One end of the stationary contact body has a contact portion with a stationary contact point. The other end of the stationary contact body has an inlet wiring portion with a wiring hole for connecting a wiring bolt. The height of the inlet wiring portion is greater than the height of the contact portion. A transition connection portion connects the contact portion and the inlet wiring portion, and the height of the inlet wiring portion is the same as the height of the outgoing terminal of the circuit breaker.

[0006] In some embodiments, the contact portion, transition connection portion, and inlet wiring portion are integrally formed using a cold heading process.

[0007] In some embodiments, a support boss is provided in the base corresponding to the stationary contact point, and the contact portion abuts against the support boss.

[0008] In some embodiments, a heat dissipation hole is provided on the side of the contact portion corresponding to the stationary contact point, and a through hole connected to the heat dissipation hole is provided on the support boss.

[0009] In some embodiments, heat dissipation grooves are respectively provided on both sides of the supporting boss inside the base.

[0010] In some embodiments, a support protrusion is provided at the corresponding transition connection portion within the base. The height of the support protrusion is the same as the height of the support boss. A positioning hole is provided on the transition connection portion, and a connecting hole communicating with the positioning hole is provided on the support protrusion.

[0011] In some embodiments, the inlet wiring portion is provided with a plurality of anti-slip grooves on the side facing the head of the wiring bolt.

[0012] In some embodiments, the base is provided with a nut that connects to the wiring bolt, and the base is provided with a snap-fit ​​groove that matches the nut. The nut is snapped into the snap-fit ​​groove, thus forming a snap-fit ​​engagement between the nut and the base.

[0013] The beneficial effects of this utility model are as follows: The stationary contact body adopts an irregular shape design. The contact part raises the height of the incoming wiring part through a transition connection part, making the height of the incoming wiring part consistent with the height of the circuit breaker's outgoing terminal. During wiring, the lengths of the matching wiring bolts on the incoming part (incoming terminal) of the stationary contact body and the outgoing terminal of the circuit breaker are the same, which can effectively avoid the situation where the incoming and outgoing wiring screws are installed in reverse, thereby ensuring more reliable contact between the wiring bolts and the incoming part of the stationary contact body and the outgoing terminal of the circuit breaker. The stationary contact body is integrally formed using a cold forging process, making the irregular shape of the stationary contact body more flexible and conducive to improving the mechanical and conductive properties of the stationary contact. Furthermore, the heat dissipation holes on the wiring part help improve the heat dissipation efficiency of the stationary contact and reduce its temperature rise. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, obtaining other drawings based on these drawings without creative effort still falls within the scope of this utility model.

[0015] Figure 1 This is an assembly diagram of the base and the stationary contact body in an embodiment of the present utility model;

[0016] Figure 2 This is an exploded view of the base and the stationary contact body in an embodiment of the present invention;

[0017] Figure 3 This is a cross-sectional view of the base and the stationary contact body in an embodiment of the present utility model;

[0018] Figure 4 This is a perspective view of the stationary contact body according to an embodiment of the present utility model. Detailed Implementation

[0019] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. The terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0021] The directional and positional terms used in this utility model, such as up, down, front, back, left, right, inside, outside, top, bottom, side, etc., are only for reference to the accompanying drawings. Therefore, the directional and positional terms used are for the purpose of explaining and understanding this utility model, and not for limiting the scope of protection of this utility model.

[0022] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments:

[0023] like Figure 1 , 2As shown in Figure 4, a non-circuitous contact of a high current circuit breaker includes a stationary contact body 20 disposed in a base 10. One end of the stationary contact body 20 has a contact portion 21 with a stationary contact point 22. The other end of the stationary contact body 10 has an inlet wiring portion 23 with a wiring hole 231 for connecting a wiring bolt 30. The height of the inlet wiring portion 23 is greater than the height of the contact portion 21. A transition connection portion 24 connects the contact portion 21 and the inlet wiring portion 23, and the height of the inlet wiring portion 23 is the same as the height of the outlet terminal 11 of the circuit breaker. The stationary contact body adopts an irregularly shaped structural design. The contact portion raises the height of the incoming wiring portion through a transition connection portion, making the height of the incoming wiring portion consistent with the height of the circuit breaker's outgoing terminal. During wiring, the matching wiring bolts on the incoming portion (incoming terminal) of the stationary contact body and the outgoing terminal of the circuit breaker are of the same length, effectively preventing the wiring screws from being installed in reverse. This ensures more reliable contact between the wiring bolts and the incoming portion of the stationary contact body and the outgoing terminal of the circuit breaker. The contact portion 21, the transition connection portion 24, and the incoming wiring portion 23 are integrally formed using a cold forging process. The stationary contact is formed using a cold forging process, which makes the irregularly shaped structure of the stationary contact body more flexible and helps improve the mechanical and conductive properties of the stationary contact.

[0024] like Figure 2 As shown, a support boss 12 is provided inside the base 10 corresponding to the stationary contact 22, and the contact portion 21 abuts against the support boss 12. The contact portion abutting against the support boss reduces the contact area between the contact portion and the base, which is beneficial for heat dissipation and improves heat dissipation efficiency. A heat dissipation hole 211 is provided on one side of the contact portion 21 corresponding to the stationary contact 22, and a through hole 121 connecting the heat dissipation hole 211 is provided on the support boss 12. Adding heat dissipation holes to the contact portion improves the heat dissipation efficiency of the stationary contact, thereby reducing the temperature rise of the stationary contact. Heat dissipation grooves 13 are provided on both sides of the base 10 corresponding to the support boss 12. Adding heat dissipation grooves inside the base effectively improves the heat dissipation efficiency of the contact portion, thus reducing the temperature rise of the stationary contact. A support protrusion 14 is provided inside the base 10 at the corresponding transition connection portion 24. The height of the support protrusion 14 is the same as the height of the support boss 12. A positioning hole 241 is provided on the transition connection portion 24, and a connecting hole 141 communicating with the positioning hole 241 is provided on the support protrusion 14. The transition connection portion can be connected to the connecting hole of the support protrusion by fasteners passing through the positioning hole, thereby facilitating the assembly of the stationary contact and the base.

[0025] like Figure 1 , 3As shown in Figure 4, the inlet wiring portion 23 has several anti-slip grooves 232 on the side facing the head of the wiring bolt 30. These anti-slip grooves increase the friction on the wire, ensuring the wiring bolt presses the wire firmly against the inlet wiring portion, thus ensuring a more secure connection. A nut 31, connected to the wiring bolt 30, is provided inside the base 10. A snap-fit ​​groove 15, matching the nut 31, is also provided inside the base 10. The nut 31 engages within the snap-fit ​​groove 15, forming a snap-fit ​​connection between the nut 31 and the base 10. Because the nut is engaged within the snap-fit ​​groove of the base, it will not rotate with the wiring bolt during wiring, thus improving wiring efficiency.

[0026] The above description is only one embodiment of the present utility model and is not intended to limit the scope of protection of the present utility model; the scope of protection of the present utility model is defined by the claims in the claims, and all equivalent changes and modifications made in accordance with the utility model are within the scope of protection of the present utility model patent.

Claims

1. A special-shaped stationary contact of a high-current circuit breaker, comprising a stationary contact body disposed within a base, characterized in that: The stationary contact body has a contact portion at one end, on which a stationary contact point is provided. The stationary contact body has an inlet wiring portion at the other end, on which a wiring hole for connecting a wiring bolt is provided. The height of the inlet wiring portion is greater than the height of the contact portion. A transition connection portion connects the contact portion and the inlet wiring portion, and the height of the inlet wiring portion is the same as the height of the outgoing terminal of the circuit breaker.

2. The irregularly shaped stationary contact of the high-current circuit breaker according to claim 1, characterized in that: The contact part, transition connection part, and inlet wiring part are integrally formed using a cold heading process.

3. The irregularly shaped stationary contact of the high-current circuit breaker according to claim 1, characterized in that: A support boss is provided at the corresponding static contact point inside the base, and the contact part abuts against the support boss.

4. The irregularly shaped stationary contact of the high-current circuit breaker according to claim 3, characterized in that: The contact portion is provided with a heat dissipation hole on the side corresponding to the stationary contact point, and the support boss is provided with a through hole that connects the heat dissipation holes.

5. The irregularly shaped stationary contact of the high-current circuit breaker according to claim 3, characterized in that: Heat dissipation grooves are provided on both sides of the supporting boss inside the base.

6. The irregularly shaped stationary contact of the high-current circuit breaker according to claim 3, characterized in that: A support protrusion is provided at the corresponding transition connection part inside the base. The height of the support protrusion is the same as the height of the support boss. A positioning hole is provided on the transition connection part, and a connecting hole communicating with the positioning hole is provided on the support protrusion.

7. The irregularly shaped stationary contact of the high-current circuit breaker according to claim 1, characterized in that: The incoming wiring section has several anti-slip grooves on the side facing the head of the wiring bolt.

8. The irregularly shaped stationary contact of the high-current circuit breaker according to claim 1, characterized in that: The base is provided with a nut that connects to the wiring bolt, and the base is provided with a snap-fit ​​groove that matches the nut. The nut is snapped into the snap-fit ​​groove, forming a snap-fit ​​engagement between the nut and the base.

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