CN108172324B

CN108172324B - Self-cooling electric conductor and power equipment

Info

Publication number: CN108172324B
Application number: CN201711425034.5A
Authority: CN
Inventors: 张广洁
Original assignee: Beijing Etechwin Electric Co Ltd
Current assignee: Beijing Etechwin Electric Co Ltd
Priority date: 2017-12-25
Filing date: 2017-12-25
Publication date: 2020-02-07
Anticipated expiration: 2037-12-25
Also published as: CN108172324A

Abstract

The invention provides a self-cooling electric conductor and electric power equipment. The self-cooling electric conductor includes: comprises a conductor body; the electric conductor comprises an electric conductor body and is characterized in that cavities extending along the axial direction of the electric conductor body are arranged in the middle of the inside of the electric conductor body and on the edge of the inside of the electric conductor body, a communication pipeline is arranged between the cavities, two ends of each cavity are sealed, and a coolant is filled in each cavity. When the conductor works, the temperature of the joint of the two ends is increased, the coolant in the two ends is heated and evaporated, the gaseous coolant is pressed into the edge cavity of the outermost layer, and the heat radiation effect is generated on the outer surface, so that the temperature is reduced. At the same time, the gaseous coolant dissipates energy as it moves along the outermost edge void to the intermediate section of the conductor body, also reducing the temperature of the coolant.

Description

Self-cooling electric conductor and power equipment

Technical Field

The invention relates to the technical field of power transmission application, in particular to a self-cooling conductor and power equipment.

Background

The copper bar is widely applied to equipment such as a power distribution cabinet, an inverter and the like. The conventional copper bar mostly adopts a solid copper bar with a rectangular cross section, and the current density in the copper bar is reduced due to the skin effect of current, so that the copper material cannot be efficiently utilized. In addition, the mounting means of conventional copper bar generally adopts the overlap joint mode more, because area of contact is little, or the contact is not real, causes the contact resistance increase at the overlap joint point to cause the copper bar to generate heat, this also is the leading cause of copper bar temperature rise.

The temperature rise of the copper bar is an important technical index in the design of the copper bar, and the size of the copper bar has to be increased in order to reduce the working temperature of the copper bar, so that the effect of reducing the temperature rise is achieved. Therefore, waste of copper material is caused.

Disclosure of Invention

The invention aims to provide a self-cooling electric conductor and electric equipment, so that the temperature of a body of the electric conductor can be reduced when the temperature of a lap joint point of the electric conductor is increased, the temperature rise of the electric conductor does not need to be controlled in a mode of increasing the size of the electric conductor, and the waste of electric conductor materials is reduced.

The present invention provides the following scheme:

a self-cooling electric conductor comprises an electric conductor body; the electric conductor comprises an electric conductor body and is characterized in that cavities extending along the axial direction of the electric conductor body are arranged in the middle of the inside of the electric conductor body and on the edge of the inside of the electric conductor body, a communication pipeline is arranged between the cavities, two ends of each cavity are sealed, and a coolant is filled in each cavity.

Preferably, the interior of the hollow is evacuated to a negative pressure.

Preferably, the cross-sectional area of the void in the inner middle is greater than the cross-sectional area of the void in the inner rim.

Further, the hollow holes in the middle of the inner part comprise a hollow hole in the center of the inner part and a plurality of groups of hollow holes; each group of hollow holes comprises a plurality of hollow holes which are arranged in a ring shape by taking the inner center as a ring center.

Furthermore, the hollow holes on the inner edge comprise a plurality of hollow holes which are arranged in a ring shape and take the inner center as a ring center.

Preferably, the centerlines of the voids are all parallel.

Preferably, the cross section of the hollow is circular or regular polygon.

Preferably, the communication channel is a capillary channel.

Preferably, the conductor body is a cylinder, a cuboid, a cube or a connection structure with bent ends.

An electric power device comprising the self-cooling electric conductor according to any one of the above.

Compared with the prior art, the scheme of the invention has the following advantages:

the invention provides a self-cooling electric conductor, wherein cavities extending along the axial direction of the electric conductor body are arranged in the middle and at the inner edge of the electric conductor body, a communication pipeline is arranged between the cavities, two ends of each cavity are sealed, and a coolant is filled in each cavity. When the conductor works, the temperature of the joint of the two ends is increased, the coolant in the two ends is heated and evaporated, the gaseous coolant is pressed into the edge cavity of the outermost layer, and the heat radiation effect is generated on the outer surface, so that the temperature is reduced. At the same time, the gaseous coolant dissipates energy as it moves along the outermost edge void to the intermediate section of the conductor body, also reducing the temperature of the coolant. Further, the coolant in the middle section after cooling flows back to the two ends of the conductor body through the middle hollow hole, so that an internal thermal circulation process is formed. As the thermal cycle progresses, the heat at the two ends of the conductor is quickly brought to the middle, so that the temperature rise at the end points is not too high. Therefore, the temperature rise of the conductor is not required to be controlled by increasing the size of the conductor, and the waste of conductor materials is reduced.

Drawings

The foregoing and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a temperature profile of a self-cooling electrical conductor according to the present invention;

FIG. 2 is an enlarged cross-sectional view of a self-cooling electrical conductor provided by the present invention;

FIG. 3 is an external structural view of a self-cooling conductor provided by the present invention;

FIG. 4 is a schematic diagram of a self-cooling principle of a self-cooling conductor according to the present invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative only and should not be construed as limiting the invention.

In industrial application, when alternating current exists in a conductor or an alternating electromagnetic field exists, the current distribution in the conductor is uneven, the current is mainly concentrated on a thin layer on the outer surface of the conductor, the closer to the surface of the conductor, the higher the current density is, and the smaller the current is actually in the conductor. Therefore, the resistance of the conductor increases, and the power loss also increases. This is the "skin effect" of the electrical conductor.

The copper bar commonly used in the industry has two phenomena, namely large copper consumption and high temperature of the copper bar. The conventional copper bar uses a large amount of copper: the conventional copper bar mostly adopts a solid copper bar with a rectangular cross section, and the current density in the copper bar is reduced due to the skin effect of current, so that the copper material cannot be efficiently utilized. The reason why the temperature of the conventional copper bar rises is as follows: the mounting means of conventional copper bar generally adopts the overlap joint mode more, because area of contact is little, or the contact is not real, causes the contact resistance increase at the overlap joint point, causes the copper bar to generate heat from the face, and this is also the leading cause of copper bar temperature rise. The temperature distribution of the copper bar after temperature rise is shown in figure 1.

Besides the copper bar, the skin effect phenomenon and the temperature rise phenomenon also exist in the electric conductor made of aluminum or other materials in the industry. Therefore, the invention provides a self-cooling electric conductor to solve the problems of low utilization rate of electric conductor material caused by skin effect of the electric conductor and increase of electric conductor material caused by temperature rise

The invention provides a self-cooling electric conductor. The self-cooling electrical conductor includes an electrical conductor body. As shown in fig. 2, the conductor body is provided with a hollow 100 extending in the axial direction of the conductor body both at the inner middle and at the inner edge. A communication duct 200 is provided between the cavities 100. The interior of the hollow 100 is filled with a coolant (not shown in fig. 2). The cavity 100 is sealed at both ends. Referring to fig. 3, the

ports

301 and 303 are sealed at both ends of the hollow 100.

According to the self-cooling electric conductor provided by the invention, when the electric conductor works, the temperature of the joint of the two ends is increased, the coolant in the two ends is heated and evaporated, the gaseous coolant is pressed into the outermost layer, and the heat radiation effect is generated on the outer surface, so that the temperature is reduced. At the same time, the gaseous coolant dissipates energy as it moves along the outermost layer toward the intermediate section of the conductor body, also lowering the temperature of the coolant. Further, the coolant in the middle section after cooling flows back to both ends of the conductor body through the middle hollow 100, thereby forming an internal thermal cycle process. As the thermal cycle progresses, the heat at the two ends of the conductor is quickly brought to the middle, so that the temperature rise at the end points is not too high. Therefore, the temperature rise of the conductor is not required to be controlled in a mode of increasing the size of the conductor, and the waste of conductor materials is reduced. In addition, the hollow 100 is arranged in the conductor, so that the power loss generated by the skin effect of the conductor is reduced, and the waste of conductor materials is further reduced.

In the present embodiment, the inside of the hollow 100 is evacuated to a negative pressure and filled with an appropriate amount of coolant. The coolant is the volatile coolant of being heated to when the electric conductor both ends are heated, the volatile attached to of coolant produces the heat radiation effect and reduces the temperature on the outer surface layer.

Preferably, the cross-sectional area of the hollow 100 in the middle of the inside of the electric conductor is larger than that of the hollow 100 at the edge of the inside, so that the coolant can flow from the middle of the inside to the edge of the inside rapidly, and the coolant is heated at the edge and attached to the outer surface to generate heat radiation effect, so as to reduce the temperature of the electric conductor, and therefore, the temperature of the electric conductor is reduced.

Further, as shown in fig. 1, the hollow 100 in the middle of the interior of the electrical conductor includes a hollow 100 and several groups of hollow 100 located in the center of the interior. Each group of the hollow 100 includes a plurality of hollow 100 arranged in a ring shape with the inner center as a ring center. The hollow 100 at the inner edge of the conductor comprises a plurality of hollow 100 which are arranged in a ring shape and take the inner center as the ring center.

Preferably, the centerlines of the voids 100 are all parallel. The cross-section of the hollow 100 is circular or regular polygonal. Such as a regular hexagon, etc. In other embodiments, the cross-section of the void 100 may be other regular or irregular shapes.

Preferably, the communication channel is a capillary channel. The capillary channel has an inner diameter equal to or less than 1 mm.

Preferably, the conductor body is a cylinder, a cuboid, a cube or a connection structure forming an end bend. In other embodiments, the shape of the conductor body is not limited, and may be other regular or irregular connection structures.

Specifically, the electric conductor is a copper bar. The copper bar structure may be as shown in fig. 1. The copper bar is internally provided with a middle cavity in the manufacturing process. Wherein the hollow is big in the middle, and the outer border hollow is little, also has tiny connecting channel between the hollow, has formed many hollows like this in the inside of copper bar to and the capillary channel who connects this hollow. The copper bar is pumped to a negative pressure state in the hollow spaces and filled with a proper amount of coolant during the manufacturing process.

The working principle of the self-cooling copper bar is shown in figure 4. When the copper bar works, heat is mainly generated at the joint of the copper bar, so that the temperature of two ends (the end portion 3033 and the end portion 3011) of the copper bar is increased, the temperature of the middle portion 3035 is relatively low, and a temperature gradient change is formed. The inside coolant of copper bar can be at both ends at first the evaporation of being heated, and the volume increase to produce certain little pressure, this pressure can make gaseous coolant press in the outmost of copper bar through the capillary tube who connects, and remove to the intermediate part 3035 of copper bar along the outmost. Therefore, the steam-shaped coolant is closest to the outer surface of the copper bar, so that the steam-shaped coolant can generate heat radiation on the outer surface of the copper bar, the temperature of the coolant in the heat radiation area 400 is reduced, meanwhile, the coolant consumes energy in the moving process, and the temperature of the coolant is also reduced. The middle section coolant after the cooling can be through the thick cavity in centre, and the resistance is low, flows back to the both ends of copper bar, has formed the inside thermal cycle process of a copper bar like this. Along with the going on of thermal cycle process, the heat at copper bar both ends is taken to the copper bar in the middle of rapidly to make the temperature rise of extreme point be unlikely to too high.

The invention also provides the electric power equipment. The power equipment comprises the self-cooling electric conductor. The power equipment may be power equipment in a high-power transmission system, or a high-power generator or a motor, etc.

The foregoing is only a partial embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

1. A self-cooling electric conductor is characterized by comprising an electric conductor body; the inner middle and the inner edge of the conductor body are provided with cavities extending along the axial direction of the conductor body, a communication pipeline is arranged between the cavity in the inner middle and the cavity at the inner edge, two ends of the cavity are sealed, and the cavity is filled with a coolant.

2. The self cooling electrical conductor according to claim 1, wherein the inside of said hollow is evacuated to a negative pressure.

3. The self cooling electrical conductor according to claim 1, wherein said inner intermediate cavity has a larger cross-sectional area than said inner rim cavity.

4. The self-cooling electrical conductor according to claim 3, wherein said internal central cavity includes a cavity and a plurality of groups of cavities located at the center of the interior; each group of hollow holes comprises a plurality of hollow holes which are arranged in a ring shape by taking the inner center as a ring center.

5. The self cooling electrical conductor according to claim 3, wherein said internal edge cavity includes a plurality of cavities arranged in a ring shape with the internal center as the center of the ring.

6. The self cooling electrical conductor according to claim 1, wherein the centerlines of said cavities are all parallel.

7. The self cooling electrical conductor according to claim 1, wherein said hollow has a cross section of a circular or regular polygon shape.

8. The self cooling electrical conductor according to claim 1, wherein said communication channel is a capillary channel.

9. The self cooling electrical conductor according to claim 1, wherein said electrical conductor body is cylindrical, rectangular, square or forms a curved end connection.

10. An electrical power device comprising the self-cooling electrical conductor of any one of claims 1 to 9.