CN220692778U - Bus and power device with same - Google Patents

Abstract

The present utility model relates to a bus bar and an electric power device having the bus bar. A busbar having a longitudinal direction along a length direction, the busbar comprising: a first conductor layer having an inner bore extending along the longitudinal direction; a second conductor layer attached to an inner wall of the first conductor layer and configured with a plurality of air holes without an intermediate bonding agent between the second conductor layer and the first conductor layer; wherein a sealed negative pressure cavity is defined by the first conductor layer and the second conductor layer together within the busbar.

Description

Bus and power device with same

Technical Field

The utility model relates to the technical field of heat dissipation protection of power equipment, in particular to a bus and a power device with the bus.

Background

Bus bars (also known as "bus bars", etc.) are typically made of a conductive metal, such as copper or aluminum, and are long conductors having a rectangular or chamfered (rounded) rectangular cross section. The bus plays a role in current transmission and electrical equipment connection in a circuit, and is widely applied to electrical engineering at present, such as power equipment such as high-voltage appliances, low-voltage appliances, switch contacts, power distribution equipment, bus slots and the like, and ultra-large current electrowinning engineering such as metal smelting, electrochemical plating, chemical caustic soda and the like.

The bus can generate heat phenomenon due to self resistance in the current conveying process, if the heat is not timely led out, the bus and connected electrical equipment are easily affected, and even the equipment is damaged. Accordingly, there is a need in the industry to improve bus bars to increase heat transfer capability.

Disclosure of Invention

The present utility model aims to provide a busbar which solves at least some of the above mentioned technical problems.

The utility model also aims to provide an electric device applying the improved bus.

According to one aspect of the present utility model, there is provided a bus bar having a longitudinal direction along a length direction, the bus bar comprising: a first conductor layer having an inner bore extending along the longitudinal direction; a second conductor layer attached to an inner wall of the first conductor layer and configured with a plurality of air holes without an intermediate bonding agent between the second conductor layer and the first conductor layer; wherein a sealed negative pressure cavity is defined by the first conductor layer and the second conductor layer together within the busbar.

According to the bus bar provided in this embodiment, a closed inner cavity is enclosed by the first conductor layer and the second conductor layer together in the interior thereof, and the inner cavity is formed in a negative pressure state, while the second conductor layer configures an air vent, which is a porous structure formed due to evaporation of moisture contained in the material during attachment of the second conductor layer to the inner wall of the first conductor layer. Therefore, the second conductor layer forms a siphon heat pipe, heat cannot be accumulated in the bus in the process of conveying current from one end (heat source end) to the other end of the bus, and heat conduction capacity of the bus is improved by rapidly guiding out the heat from the bus through siphon effect.

In some embodiments, the plurality of air holes extends along a longitudinal length of the second conductor layer throughout the second conductor layer.

In some embodiments, the second conductor layer is configured to sinter attached to an inner wall of the first conductor layer.

In some embodiments, the second conductor layer is attached to the inner peripheral wall of the first conductor layer with a uniform thickness.

In some embodiments, the first conductor layer is configured as a copper conductor layer.

In some embodiments, the second conductor layer is configured as a copper powder sintered conductor layer.

In some embodiments, the thickness of the second conductor layer is less than the thickness of the first conductor layer.

In some embodiments, the bus bar is provided with engaging portions at both ends in the longitudinal direction, respectively, the engaging portions being spaced apart from the negative pressure chamber.

According to another aspect of the utility model, there is provided an electrical device comprising the aforementioned bus bar.

In some embodiments, the power device is configured as a high voltage appliance, a low voltage appliance, a switch, a power distribution device, or a bus duct.

Additional features and advantages of the utility model will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following, or may be learned from practice of the utility model.

Drawings

Embodiments of the present utility model are described in detail below with reference to the attached drawing figures, wherein:

FIG. 1 is a schematic view of a bus bar according to an embodiment of the utility model.

Fig. 2 is an enlarged view at a of fig. 1.

Reference numerals illustrate:

10. a first conductor layer; 20. a second conductor layer; 30. a negative pressure chamber; 40. a bus; 41. a first end; 42. a second end; 50. a first joint; 60. second joint part

Detailed Description

Referring now to the drawings, illustrative aspects of the disclosed bus bar and power device having the same will be described in detail. Although the drawings are provided to present some embodiments of the utility model, the drawings are not necessarily to scale and certain features may be exaggerated, removed, or partially sectioned to better illustrate and explain the present disclosure. The position of part of components in the drawings can be adjusted according to actual requirements on the premise of not affecting the technical effect. The appearances of the phrase "in the drawings" or similar language in the specification do not necessarily refer to all figures or examples.

Certain directional terms used hereinafter to describe the drawings, such as "inner", "outer", "above", "below" and other directional terms, will be understood to have their normal meaning and refer to those directions as they would be when viewing the drawings. Unless otherwise indicated, directional terms described herein are generally in accordance with conventional directions as understood by those skilled in the art.

The terms "first," "second," and the like, as used herein, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another.

The utility model provides a bus bar, which is suitable for electric devices, such as high-voltage electric appliances, low-voltage electric appliances, switch contacts, power distribution devices or bus slots. The bus bar is constructed with an inner and an outer conductor layer, wherein the inner conductor layer is formed with air holes (air gaps) due to evaporation of moisture contained in the material during the preparation. The inner conductor layer is formed into a siphon heat pipe, so that heat generated when the bus transmits current can be rapidly conducted out.

Fig. 1 and 2 show an exemplary version of a busbar according to the utility model. As shown in fig. 1 and 2, the bus bar 40 is constructed in a long tubular shape and has a longitudinal direction along the length direction and a transverse direction perpendicular to the length direction. Current flows longitudinally in the bus bar 40 from one end to the other and heat is generated due to the resistance. The current inflow end of the bus bar 40 is defined herein as a first end 41 and the current outflow end of the bus bar 40 is positioned as a second end 42. Generally, during the delivery of current, the temperature rise at first end 41 will be significantly higher than the temperature rise at second end 42, first end 41 also being referred to as the "heat source end". If the heat from first end 41 is not directed quickly to second end 42, it can affect bus bar 40 and the components to which bus bar 40 is connected, even causing failure.

In order to rapidly conduct out heat, the bus bar 40 is constructed in a double layer structure including an outer first conductor layer 10 and an inner second conductor layer 20 according to an embodiment of the present utility model. As shown in fig. 1 and 2, the first conductor layer 10 extends from a first end 41 to a second end 42, the material of which is selected from a metal, such as copper or aluminum, preferably copper. An inner bore is formed in the first conductor layer 10, the inner bore extending between the first end 41 and the second end 42, and end surfaces at longitudinally opposite ends of the inner bore being spaced from end surfaces of the first end 41 and the second end 42. In other words, the inner hole is not formed as a longitudinally penetrating hole in the first conductor layer 10, but is a "buried hole" whose both ends are cut off in the first conductor layer. The internal bore of this configuration is particularly helpful in creating the siphon thermal conductivity required by the present utility model.

The second conductor layer 20 is attached to the walls of the inner bore of the first conductor layer 10. Here, the second conductor layer 20 and the first conductor layer 10 are bonded together without any intermediate bonding agent (e.g., adhesive). In one embodiment, the second conductor layer 20 is a sintered conductor layer attached to the entire inner peripheral wall of the first conductor layer 20 by a sintering process. The material of the second conductor layer 20 may be selected from metal powder, such as copper powder or aluminum powder, preferably copper powder.

The second conductor layer 20 is bonded to the inner peripheral wall of the first conductor layer 10 and is hollow so as to be able to define a sealed negative pressure chamber 30 together with the first conductor layer 10.

An exemplary process for preparing a bus bar will be described below using a copper first conductor layer and a copper second conductor layer as examples.

First, copper powder is provided, and a certain amount of water is mixed in the copper powder. A prefabricated copper first conductor layer is also provided, which has a longitudinal bore.

The mandrel is inserted into the inner bore of the first conductor layer. The dimensions of the mandrel are selected such that a gap exists between the outer circumferential surface of the mandrel and the inner circumferential surface of the first conductor layer, wherein the dimensions of the gap are determined according to the desired thickness of the second conductor layer. The thickness of the second conductor layer may be less than, equal to, or greater than the thickness of the first conductor layer, preferably less than the thickness of the first conductor layer.

Copper powder is poured into the gap between the mandrel and the first conductor layer.

The copper powder is converted by the sintering process into a dense and uniform thickness second conductor layer, which is also bonded to the inner periphery of the first conductor layer. During sintering, the moisture contained in the copper powder evaporates, thereby forming pores within the sintered second conductor layer. The air holes extend over the entire second conductor layer along the longitudinal length of the second conductor layer. The voids may be uniformly distributed longitudinally in the second conductor layer or, in other embodiments, the density of voids at different locations of the second conductor layer may be adjusted by tailoring the moisture content of the copper powder at different locations, such as such that the density of voids near the first end of the bus bar is greater than the density of voids near the second end of the bus bar.

The mandrel is withdrawn, leaving an interior space within the second conductor layer.

And negative pressure is pumped and sealed to the inner space of the second conductor layer, so that a closed negative pressure cavity is formed in the bus.

Compared with the traditional solid metal bus bar, the bus bar is composed of the first conductor layer and the second conductor layer, the density of the second conductor layer is smaller than that of the first conductor layer, and the heat pipe is formed by combining the sealed negative pressure cavity in the bus bar, so that the heat generated by the conveying current is led out from the first end 41 to the second end 42 of the bus bar 40, and the heat dissipation capacity of the bus bar is improved. The bus prepared in this way has no limitation of placement orientation, i.e. good heat conduction effect can be realized whether vertically, horizontally or obliquely. The bus bar with the configuration reduces the interception area and the weight while effectively controlling the temperature rise and meeting the heat conduction requirement, and can remarkably save the cost.

Although only the process of forming the second conductor layer and ultimately preparing the bus bar by sintering the powdered metal to the inner wall of the first conductor layer is described in detail, one skilled in the art will appreciate that the powdered metal may also be bonded to the first conductor layer in any suitable manner without the application of an intermediate bonding agent, such as with additive manufacturing techniques.

In order to smoothly connect the bus bar to the power device, joint portions, such as a joint, may be provided at both ends of the bus bar 40. It should be noted that the junction of the busbar 40 is spaced from the sealed negative pressure chamber 30, avoiding affecting the heat conduction of the busbar 40. In the illustrated embodiment, a first engagement portion 50 is provided at the first end 41 of the bus bar 40 and a second engagement portion 60 is provided at the second end 42 of the bus bar 40. The first engaging portion 50 and the second engaging portion 60 are configured as engaging holes here.

It should be understood that although the present disclosure has been described in terms of various embodiments, not every embodiment is provided with a separate technical solution, and this description is for clarity only, and those skilled in the art should consider the disclosure as a whole, and the technical solutions in the various embodiments may be combined appropriately to form other embodiments that will be understood by those skilled in the art.

The foregoing is illustrative of the present utility model and is not to be construed as limiting the scope of the utility model. Any equivalent alterations, modifications and combinations thereof will be effected by those skilled in the art without departing from the spirit and principles of this utility model, and it is intended to be within the scope of the utility model.

Claims (10)

1. A busbar having a longitudinal direction along a length, the busbar comprising:

a first conductor layer (10) having an inner bore extending in the longitudinal direction;

a second conductor layer (20) attached to an inner wall of the first conductor layer (10) and configured with a plurality of air holes, and without an intermediate bonding agent between the second conductor layer (20) and the first conductor layer (10);

wherein a sealed vacuum chamber (30) is jointly defined by the first conductor layer (10) and the second conductor layer (20) within the busbar.

2. The bus bar of claim 1, wherein the plurality of air holes extend throughout the second conductor layer (20) along a longitudinal length of the second conductor layer (20).

3. The bus bar according to claim 1, characterized in that the second conductor layer (20) is configured to be sinter-adhered to the inner wall of the first conductor layer (10).

4. Busbar according to claim 1, characterized in that the second conductor layer (20) is attached to the inner peripheral wall of the first conductor layer (10) with a uniform thickness.

5. The busbar of claim 1, wherein the first conductor layer (10) is configured as a copper conductor layer.

6. The busbar of claim 1, wherein the second conductor layer (20) is configured as a copper powder sintered conductor layer.

7. The busbar of claim 1, wherein the thickness of the second conductor layer (20) is smaller than the thickness of the first conductor layer (10).

8. The busbar according to any one of claims 1 to 7, characterized in that the busbar is provided with a joint at each of its longitudinal ends, which joint is spaced apart from the negative pressure chamber (30).

9. An electrical device comprising the bus bar of any one of claims 1 to 8.

10. The electrical device of claim 9, wherein the electrical device is configured as a high voltage appliance, a low voltage appliance, a switch, a power distribution device, or a bus duct.