Double-contact copper bar structure for DPDT circuit breaker

Abstract

A double-contact copper bar structure for a DPDT circuit breaker comprises a copper foil soft bar and a hard copper bar, two ends of the copper foil soft bar are respectively provided with a first contact support arm and a second contact support arm, the first contact support arm and the second contact support arm are oppositely arranged on two sides of the hard copper bar, and the front end of the hard copper bar is welded and fixed on the middle section of the copper foil soft bar. According to the scheme, aiming at the problems that a single-contact design is adopted in a traditional DPDT circuit breaker busbar structure, a large number of hard copper bars are needed, the mass is large, and the welding cost is high, a double-contact copper bar structure design is adopted, and the use number of the hard copper bars is reduced; meanwhile, one end of the hard copper bar is connected with one end of the copper foil soft bar in a two-side wrapping mode, and the hard copper bar and the copper foil soft bar can be fixedly connected through one-time welding of friction stir welding. Compared with the prior art, the double-contact copper bar structure for the DPDT circuit breaker provided by the utility model has the following advantages: the quality and material cost of the copper bar are reduced, and the welding cost and the welding time of the soft and hard copper bars are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit breaker contact copper bars, in particular to a double-contact copper bar structure for a DPDT circuit breaker. Background Art

[0002] New energy vehicles refer to vehicles that use unconventional automotive fuels as their power source, have advanced power control and drive technologies, and can achieve higher energy efficiency and environmental performance. As competition in the new energy vehicle industry intensifies, customers are paying more attention to the load and cost of new energy vehicles, making the new energy vehicle industry continue to develop towards lightweight and low-cost.

[0003] The busbar structure of the DPDT circuit breaker of traditional new energy vehicles is composed of 4 single-contact soft-hard copper bars connected by lines. The single-contact soft-hard copper bar is mainly made of 0.3mm copper foil and 2.5mm thick hard copper bar diffusion welding. The DPDT circuit breaker busbar needs to be welded four times during production, which has high welding costs. At the same time, due to the use of a total of 4 2.5mm thick hard copper bars, the weight of the DPDT circuit breaker busbar is very large, which is contrary to the development direction of lightweight new energy vehicles. At the same time, the connection stability between too many structural parts is difficult to ensure, which is not conducive to improving the circuit reliability of new energy vehicles.

[0004] Therefore, in view of the deficiencies in the prior art, the utility model designs a double-contact copper busbar structure for a DPDT circuit breaker to solve the above problems.

[0005] It should be noted that the above introduction to the technical background is only for the convenience of clearly and completely explaining the technical solution of the utility model and facilitating the understanding of those skilled in the art. It cannot be considered that the above contents are well known to those skilled in the art simply because they are explained in the background technology of the utility model. Utility Model Content

[0006] In order to overcome the above-mentioned deficiencies in the prior art, the utility model aims to provide a double-contact copper busbar structure for a DPDT circuit breaker.

[0007] To achieve the above-mentioned purpose and other related purposes, the technical solution provided by the utility model is: a double-contact copper busbar structure for a DPDT circuit breaker, comprising a copper foil soft busbar and a hard copper busbar, wherein the two ends of the copper foil soft busbar are respectively provided with a first contact arm and a second contact arm, the first contact arm and the second contact arm are arranged opposite to each other on both sides of the hard copper busbar, and the front end of the hard copper busbar is welded and fixed to the middle section of the copper foil soft busbar.

[0008] The preferred technical solution is that the copper foil flexible bus is composed of at least one layer of copper foil.

[0009] The preferred technical solution is: the copper foil is eight layers. Through the design of multi-layer copper foil, the overall structural stability and bending resistance of the flexible row can be significantly enhanced.

[0010] The preferred technical solution is that the front end of the hard copper busbar and the middle section of the copper foil soft busbar are connected via a friction stir welding area.

[0011] The preferred technical solution is that the welding direction of the friction stir welding area is consistent with the setting direction of the hard copper busbar, which facilitates welding.

[0012] The preferred technical solution is: a first rebound structure is provided on the first contact support arm, and a second rebound structure is provided on the second contact support arm, so as to improve the elasticity of the first contact support arm and the second contact support arm.

[0013] The preferred technical solution is that the first rebound structure and the second rebound structure are both U-shaped structures, which increase the elasticity of the copper foil busbar while keeping the thickness unchanged, thereby reducing the weight of the copper busbar and achieving lightweight.

[0014] The preferred technical solution is: a first contact is provided on the first contact support arm, and a second contact is provided on the second contact support arm for circuit switching.

[0015] The structural features of the above scheme are explained as follows:

[0016] The traditional DPDT circuit breaker busbar structure adopts a single-contact design, which requires a large number of hard copper bars, which are heavy and have high welding costs. This solution adopts a double-contact copper bar structure design to solve this problem. A soft copper bar with two sets of contact structures is installed on a hard copper bar. The double-contact copper bar can replace two single-contact copper bars, reducing the number of hard copper bars used and thus reducing the quality of the DPDT circuit breaker busbar. At the same time, the copper foil soft bar adopts a two-side wrapping connection method for one end of the hard copper bar. Stir friction welding is used to weld from the outside of the copper foil soft bar to the end of the hard copper bar once to complete the fixed connection between the hard copper bar and the copper foil soft bar. The connection is stable and the welding cost and time are reduced. A U-shaped structure is designed on the copper foil soft bar as a rebound structure, which can ensure that the contact arm has a reliable rebound ability while reducing the thickness of the copper foil soft bar.

[0017] Due to the application of the above technical solution, the double-contact copper bar structure for DPDT circuit breaker provided by the utility model has the following advantages compared with the prior art: the quality and material cost of the double-contact copper bar for DPDT circuit breaker are reduced, and the welding cost and welding time of the soft copper bar and the hard copper bar in the double-contact copper bar are reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of a double-contact copper bar used for a DPDT circuit breaker of the utility model;

[0019] Figure 2 for Figure 1 A local enlarged view of point Ⅰ in the figure.

[0020] In the above figures, 1, soft copper foil bus; 11, first contact arm; 11a, first rebound structure; 11b, first contact; 12, second contact arm; 12a, second rebound structure; 12b, second contact; 2, hard copper bus; 3, friction stir welding area. DETAILED DESCRIPTION

[0021] The following is a description of the implementation of the present invention by means of specific embodiments. People familiar with the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0022] In the description of the present utility model, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, terms such as "horizontal", "vertical", and "overhanging" do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0023] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection, it can be a mechanical connection, it can be an electrical connection, it can be a direct connection, it can be indirectly connected through an intermediate medium, and it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] Example:

[0025] like Figure 1 and Figure 2 As shown, the utility model discloses a double-contact copper busbar structure for a DPDT circuit breaker, including a copper foil soft busbar 1 and a hard copper busbar 2. The main components of the utility model are described in detail below:

[0026] like Figure 1 and Figure 2As shown, the copper foil flexible row 1 is composed of eight layers of 0.3 mm copper foil pressed together; the first contact arm 11 and the second contact arm 12 are respectively provided at both ends of the copper foil flexible row 1, and the first contact arm 11 and the second contact arm 12 are arranged opposite to each other on both sides of the hard copper row 2; the first contact arm 11 is provided with a first rebound structure 11a, and the second contact arm 12 is provided with a second rebound structure 12a, and the first rebound structure 11a and the second rebound structure 12a are both U-shaped structures; the first contact arm 11 is provided with a first contact 11b, and the second contact arm 12 is provided with a second contact 12b. It should be noted that the above structure is only exemplary and not restrictive. In this embodiment, the copper foil flexible row 1 is composed of eight layers of 0.3 mm copper foil, but in other embodiments, the copper foil flexible row 1 can also be composed of eight layers of 0.28 mm copper foil; in other embodiments, the copper foil flexible row 1 can also be composed of eight layers of 0.32 mm copper foil.

[0027] like Figure 1 and Figure 2 As shown, the hard copper bar 2 is a thick hard copper bar with a thickness of 2.5 mm, the front end of the hard copper bar 2 is covered by the copper foil soft bar 1, and is fixed to the middle section of the copper foil soft bar 1 by stir friction welding, the welding direction of the stir friction welding is consistent with the setting direction of the hard copper bar 2, and the front end of the hard copper bar 2 and the middle section of the copper foil soft bar 1 only need to be connected through a stir friction welding area 3. It should be noted that in this embodiment, the hard copper bar 2 is a thick hard copper bar with a thickness of 2.5 mm, but in other embodiments, the hard copper bar 2 can be a thick hard copper bar of 2.4 mm, and in other embodiments, the hard copper bar 2 can also be a thick hard copper bar of 2.6 mm.

[0028] In summary, the utility model discloses a double-contact copper busbar structure for a DPDT circuit breaker, which adopts a double-contact copper busbar structure to replace the traditional single-contact copper busbar structure, thereby reducing the use of materials for the copper busbar, thereby reducing the material cost and weight of the material, and realizing the lightweight copper busbar product; at the same time, the copper foil soft busbar adopts a covering combination method for the end of the hard copper busbar, which can be directly fixed by stir friction welding, and only needs to be welded once, reducing the welding time and cost.

[0029] The above embodiments provided by the present invention are only intended to illustrate the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the relevant technical field without departing from the spirit and technical ideas disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A double-contact copper busbar structure for a DPDT circuit breaker, characterized in that: The invention comprises a copper foil flexible busbar (1) and a hard copper busbar (2), wherein two ends of the copper foil flexible busbar (1) are respectively provided with a first contact support arm (11) and a second contact support arm (12), the first contact support arm (11) and the second contact support arm (12) are arranged opposite to each other on both sides of the hard copper busbar (2), and the front end of the hard copper busbar (2) is welded and fixed to the middle section of the copper foil flexible busbar (1).

2. A double-contact copper busbar structure for a DPDT circuit breaker according to claim 1, characterized in that: The copper foil flexible bus (1) is composed of at least one layer of copper foil.

3. The double-contact copper busbar structure for a DPDT circuit breaker according to claim 2, characterized in that: The copper foil has eight layers.

4. The double-contact copper busbar structure for a DPDT circuit breaker according to claim 1, characterized in that: The front end of the hard copper busbar (2) and the middle section of the copper foil soft busbar (1) are connected via a friction stir welding area (3).

5. A double-contact copper busbar structure for a DPDT circuit breaker according to claim 4, characterized in that: The welding direction of the friction stir welding area is consistent with the arrangement direction of the hard copper busbar (2).

6. The double-contact copper busbar structure for DPDT circuit breaker according to claim 1, characterized in that: The first contact support arm (11) is provided with a first rebound structure (11a), and the second contact support arm (12) is provided with a second rebound structure (12a).

7. A double-contact copper busbar structure for a DPDT circuit breaker according to claim 6, characterized in that: The first rebound structure (11a) and the second rebound structure (12a) are both U-shaped structures.

8. The double-contact copper busbar structure for DPDT circuit breaker according to claim 1, characterized in that: The first contact support arm (11) is provided with a first contact (11b), and the second contact support arm (12) is provided with a second contact (12b).

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