Special-shaped conductive connecting piece of circuit breaker

Abstract

The utility model belongs to the field of circuit breakers, and particularly relates to a special-shaped conductive connecting piece of a circuit breaker, which comprises a conductive body, one end of the conductive body is provided with a round-rod-shaped conductive part matched with a mutual inductor, one end of the conductive part penetrates through a magnetic core hole of the mutual inductor and extends into a base, and the other end of the conductive body is provided with a straight-plate-shaped wiring part. The wiring part is provided with a through hole used for being connected with a wiring bolt. The conductive part of the conductive connecting piece adopts the round bar-shaped structural design, so that the skin effect can be effectively reduced, the current distribution is uniform, the effective sectional area utilization rate is low, and the resistance is reduced, thereby being beneficial to improving the conductive performance and reducing the temperature rise. The conductive part adopting the round rod-shaped structural design is low in space occupancy rate, does not occupy the use space of the mutual inductor, is beneficial to reducing the temperature rise of the mutual inductor, and is beneficial to realizing the miniaturization design of the circuit breaker.

Description

Technical Field

[0001] This utility model belongs to the field of circuit breaker technology, specifically relating to an irregularly shaped conductive connector for a 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 molded case circuit breakers (MCCBs) employ a three-phase or four-phase flat-plate conductor design. During installation, one end of the flat-plate conductor is connected to a wiring bolt, while the other end passes through an instrument transformer. With the increasing miniaturization and intelligentization of MCCBs, the internal space is becoming increasingly limited. While the flat-plate conductor structure is easy to manufacture, its high space occupancy reduces the usable space for the instrument transformer, hindering temperature rise reduction and significantly impacting product performance. Furthermore, this flat-plate structure exhibits a significant skin effect, concentrating high-frequency current on the surface of the flat plate, resulting in uneven current distribution, low effective cross-sectional area utilization, and increased resistance, thus affecting conductivity. In high-frequency AC scenarios, the skin effect of the conductive copper busbar significantly increases AC resistance, leading to higher temperature rise. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings and deficiencies of the existing technology and to provide a circuit breaker irregular conductive connection component with low space occupancy, good conductivity and low temperature rise.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: an irregularly shaped conductive connector for a circuit breaker, comprising a conductive body disposed in a base, one end of the conductive body having a rod-shaped conductive portion that cooperates with a current transformer, one end of the conductive portion passing through the magnetic core hole of the current transformer and extending into the base, the other end of the conductive body having a straight plate-shaped wiring portion, the wiring portion being provided with a through hole for connecting a wiring bolt.

[0006] In some embodiments, one end of the conductive portion has a connecting portion that is exposed outside the transformer and connected to the copper braided strip.

[0007] In some embodiments, the wiring portion, conductive portion, and connecting portion are integrally formed using a cold heading process.

[0008] In some embodiments, the connecting portion has contact planes on both sides that are connected to the copper braided strip.

[0009] In some embodiments, the cross-sectional shape of the conductive part is circular or elliptical.

[0010] In some embodiments, the conductive portion has two beveled surfaces that transition to the two sides of the wiring portion.

[0011] In some embodiments, the 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] In some embodiments, two positioning slots are provided in the base corresponding to both ends of the current transformer, and both ends of the current transformer are respectively engaged in the two positioning slots, forming a snap-fit ​​connection between the current transformer and the base.

[0014] In some embodiments, a positioning hole is provided on the side of the wiring part corresponding to the through hole, and a connecting hole that matches the positioning hole is provided on the base.

[0015] The beneficial effects of this utility model are as follows: The conductive part of the conductive connector adopts a cylindrical rod structure design, which can effectively reduce the skin effect, ensure uniform current distribution, reduce the effective cross-sectional area utilization rate, and decrease resistance, thereby improving conductivity and reducing temperature rise. The cylindrical rod structure design of the conductive part has a low space occupancy rate, does not occupy the space of the current transformer, helps reduce the temperature rise of the current transformer, and facilitates the miniaturization design of the circuit breaker. Furthermore, the conductive connector is integrally formed using a cold forging process, making the irregular shape forming of the conductive connector more flexible and improving its mechanical and conductive properties. Attached Figure Description

[0016] 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.

[0017] Figure 1 This is an assembly diagram of the irregularly shaped conductive connector and the base according to an embodiment of the present utility model;

[0018] Figure 2 This is an exploded view of the irregularly shaped conductive connector and the base according to an embodiment of the present invention;

[0019] Figure 3This is a cross-sectional view of the irregularly shaped conductive connector and the base according to an embodiment of the present utility model;

[0020] Figure 4 This is a perspective view of the irregularly shaped conductive connector according to an embodiment of the present invention. Detailed Implementation

[0021] 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.

[0022] 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.

[0023] 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.

[0024] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments:

[0025] like Figure 1 , 2As shown in Figure 3, an irregularly shaped conductive connector for a circuit breaker includes a conductive body 20 disposed within a base 10. One end of the conductive body 20 has a rod-shaped conductive portion 21 that mates with a current transformer 11. One end of the conductive portion 21 passes through the core hole 111 of the current transformer 11 and extends into the base 10. The other end of the conductive body 20 has a straight plate-shaped wiring portion 22, on which a through hole 221 for connecting a wiring bolt 12 is provided. The rod-shaped structure of the conductive portion of this conductive connector effectively reduces the skin effect, resulting in uniform current distribution, low effective cross-sectional area utilization, and reduced resistance, thereby improving conductivity and reducing temperature rise. The rod-shaped conductive portion also has a low space occupancy rate, does not occupy the space of the current transformer, helps reduce the temperature rise of the current transformer, and facilitates miniaturization of the circuit breaker design. One end of the conductive portion 21 has a connecting portion 23 exposed outside the current transformer 11 and connected to a copper braided strip. A connecting portion is provided on the conductive part to facilitate the assembly of the conductive part with the copper braided strip. The wiring part 22, the conductive part 21, and the connecting portion 23 are integrally formed using a cold heading process. Furthermore, the integral forming of the conductive connector using a cold heading process allows for more flexible shaping of irregular structures of the conductive connector, which is beneficial to improving its mechanical and electrical properties.

[0026] like Figure 4 As shown, the connecting part 23 has contact planes 231 on both sides that connect to the copper braided strip. The connection between the connecting part and the copper braided strip via these contact planes ensures a more reliable connection. The conductive part 21 has a circular or elliptical cross-sectional shape. This circular or elliptical design reduces the skin effect and improves conductivity. The conductive part 21 has two beveled surfaces 201 that transition to the two sides of the wiring part 22. The wiring part 22 has several anti-slip grooves 222 on the side facing the head of the wiring bolt 12. These grooves increase friction on the wires, allowing the wiring bolt to press the wires firmly onto the wiring part, resulting in a more secure connection.

[0027] like Figure 2As shown, a nut 13 connected to the wiring bolt 12 is provided inside the base 10. A snap-fit ​​groove 101 matching the nut 13 is also provided inside the base 10. The nut 13 snaps into the snap-fit ​​groove 101, forming a snap-fit ​​engagement between the nut 13 and the base 10. Because the nut is snapped into the snap-fit ​​groove of the base, it will not rotate with the wiring bolt during wiring, which improves wiring efficiency and makes wiring more convenient. Two positioning grooves 102 are provided inside the base 10 corresponding to both ends of the current transformer 11. Both ends of the current transformer 11 snap into the two positioning grooves 102 respectively, forming a snap-fit ​​engagement between the current transformer 11 and the base 10. The current transformer and the base are assembled using a snap-fit ​​method, thereby achieving modular assembly of the current transformer, conductive connector, and base, resulting in higher assembly efficiency. A positioning hole 223 is provided on the side of the wiring part 22 corresponding to the through hole 221, and a connection hole 103 matching the positioning hole 223 is provided on the base 10. The positioning holes of the wiring section are connected to the connection holes through fasteners, which ensures a tighter connection between the wiring section and the base.

[0028] 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. An irregularly shaped conductive connector for a circuit breaker, comprising a conductive body disposed within a base, characterized in that: One end of the conductive body has a rod-shaped conductive part that cooperates with the current transformer. One end of the conductive part passes through the magnetic core hole of the current transformer and extends into the base. The other end of the conductive body has a straight plate-shaped wiring part with a through hole for connecting wiring bolts.

2. The irregularly shaped conductive connector of the circuit breaker according to claim 1, characterized in that: One end of the conductive part has a connecting part that is exposed outside the current transformer and connected to the copper braided strip.

3. The irregularly shaped conductive connector of the circuit breaker according to claim 2, characterized in that: The wiring part, conductive part, and connecting part are integrally formed using a cold forging process.

4. The irregularly shaped conductive connector of the circuit breaker according to claim 3, characterized in that: The connecting part has contact planes on both sides that connect to the copper braided strip.

5. The irregularly shaped conductive connector of the circuit breaker according to claim 1, 2, 3, or 4, characterized in that: The cross-sectional shape of the conductive part is circular or elliptical.

6. The irregularly shaped conductive connector of the circuit breaker according to claim 1 or 2, characterized in that: The conductive part has two beveled surfaces that transition to the two sides of the wiring part.

7. The irregularly shaped conductive connector of the circuit breaker according to claim 1 or 2, characterized in that: The wiring section is provided with several anti-slip grooves on the side facing the head of the wiring bolt.

8. The irregularly shaped conductive connector of the 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.

9. The irregularly shaped conductive connector of the circuit breaker according to claim 1, characterized in that: The base has two positioning slots at the two ends of the current transformer, and the two ends of the current transformer are respectively engaged in the two positioning slots, forming a snap-fit ​​connection between the current transformer and the base.

10. The irregularly shaped conductive connector of the circuit breaker according to claim 1, characterized in that: The wiring part is provided with a positioning hole on one side corresponding to the through hole, and the base is provided with a connection hole that matches the positioning hole.

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