CN110829308A

CN110829308A - Electric junction box for preventing condensed water

Info

Publication number: CN110829308A
Application number: CN201911072009.2A
Authority: CN
Inventors: 陈强; 薛秀慧; 耿涛; 尚前博
Original assignee: CRRC Yongji Electric Co Ltd
Current assignee: CRRC Yongji Electric Co Ltd
Priority date: 2019-11-05
Filing date: 2019-11-05
Publication date: 2020-02-21

Abstract

The invention relates to an electric junction box, in particular to an electric junction box for preventing condensed water. The problem of current electrical junction box prevent condensate water structure unreasonable is solved. The electric junction box for preventing the condensed water is composed of a box body with an opening on one side and a cover plate which is hermetically covered and fixed on the opening of the box body; the periphery and the bottom of the box body are of a hollow structure except for a perforation part for the cable to pass through; the cover plate is of a hollow structure; the hollow parts of the box body and the cover plate are filled with heat insulating materials or vacuumized. Through the hollow structure and filling heat insulation materials or vacuumizing, heat conduction inside and outside the electric junction box is cut off, and the purpose of preventing condensed water from forming is achieved. The invention skillfully uses the hollow or sandwich structure for the electrical junction box, and the design idea is novel, unique and reasonable. The invention is suitable for the electric junction box of a bullet train or a locomotive and is also suitable for the electric junction box in other fields under the environment with severe high and low temperature and humidity change.

Description

Electric junction box for preventing condensed water

Technical Field

The invention relates to an electric junction box, in particular to an electric junction box on a motor train unit, and particularly relates to an electric junction box for preventing condensed water.

Background

The running environment of the motor train is changeable and complex, the electric junction box on the motor train generates condensed water phenomenon in the motor train due to the temperature difference between the inner environment and the outer environment, so that the electric insulation is reduced or grounded, for example, the motor train unit stops outside a workshop of the motor train section in winter, the outdoor environment temperature is about 20 ℃ below zero, the overhaul operation environment temperature in a warehouse is 25 ℃, the cold and hot alternation can generate condensed water in the electric junction box, and the electric insulation is reduced.

For preventing that the condensation water from producing the back and causing the insulation in the electric terminal box to reduce or electric fault, adopt at present mostly to increase electric distance in the electric terminal box, guarantee under the condition that has the comdenstion water, do not take place the creepage phenomenon, but consequently increased the size and the weight of electric terminal box, be unfavorable for the lightweight of high-speed railway EMUs.

The other scheme is that a water leakage hole is formed in the electric junction box, and after condensed water occurs, the condensed water flows out of the water leakage hole. However, the scheme reduces the IP protection level of the electric junction box, dust is easy to enter the electric junction box, and the electric gap is shortened. The third solution is to add a ventilation device, which requires less equipment and cost.

Disclosure of Invention

The invention solves the problem of unreasonable condensed water prevention structure of the existing electric junction box, and provides an electric junction box for preventing condensed water. The electric junction box is of a hollow structure, materials with low heat conductivity coefficients are filled in the hollow structure or vacuum pumping is carried out, and cables, wiring terminals, sheaths, insulators and the like on the electric junction box are sealed.

The invention is realized by adopting the following technical scheme: the electric junction box for preventing the condensed water is composed of a box body with an opening on one side and a cover plate which is hermetically covered and fixed on the opening of the box body; the periphery and the bottom of the box body are of a hollow structure except a perforation part for the cable to pass through (namely, the perforation part for the cable to pass through is of a solid structure and has no hollow structure); the cover plate is of a hollow structure; the hollow parts of the box body and the cover plate are filled with heat insulating materials or vacuumized. Through the hollow structure and filling heat insulation materials or vacuumizing, heat conduction inside and outside the electric junction box is cut off, and the purpose of preventing condensed water from forming is achieved.

In order to facilitate filling, in the processing process (welding or casting), the hollow part of the cover plate forms a single-side opening, the hollow part of the box body forms a single-side opening, and after heat insulation materials are filled or vacuumized, the opening is welded and sealed or covered with sealant for sealing.

The invention provides an electric junction box for preventing condensed water, which solves the problems of electric faults and insulation reduction caused by the condensed water, overcomes the defects and shortcomings of the existing condensed water prevention structure of the electric junction box, skillfully applies a hollow or sandwich structure to the electric junction box, and has novel, unique and reasonable design thought. The invention is suitable for the electric junction box of a bullet train or a locomotive and is also suitable for the electric junction box in other fields under the environment with severe high and low temperature and humidity change. The invention can effectively reduce the electrical fault caused by the condensed water and greatly improve the reliability of operation.

Drawings

FIG. 1 is a schematic structural view of the present invention;

fig. 2 is a top view of fig. 1 with the cover removed.

In the figure: the cable comprises a cover plate 1, a heat insulation material 2, a box body 3, a bottom plate 4, a connecting lug 5, a arrowroot 6, a cable 7, an insulator 8 and a connecting terminal 9.

Detailed Description

The electric junction box for preventing the condensed water is composed of a box body with an opening on one side and a cover plate 1 which is hermetically covered and fixed on the opening of the box body; the periphery and the bottom of the box body are of a hollow structure except a perforation part for the cable to pass through (namely, the perforation part for the cable to pass through is of a solid structure and has no hollow structure); the cover plate 1 is of a hollow structure; the hollow parts of the box body and the cover plate 1 are filled with heat insulating materials 2 or vacuumized. In order to facilitate filling, during processing (welding or casting), the hollow part of the cover plate 1 forms a single-side opening, the hollow part of the box body forms a single-side opening, and after the heat insulation material 2 is filled or vacuumized, the opening is welded and sealed or covered with sealant for sealing. The heat insulating material 2 is made of a material having a thermal conductivity lower than that of metal.

In specific implementation, the box body is formed by fixedly connecting a box body 3 with an upper opening and a lower opening and a bottom plate 4 for convenient processing; the lower part of the box body 3 extends all around to form evenly distributed connection lugs 5 with bolt holes formed in the connection lugs, and bolts penetrate through the bolt holes in the connection lugs 5 to be screwed on the bottom plate 4, so that the box body 3 and the bottom plate 4 are connected and fixed. Specifically, the engaging lugs 5 are distributed at four corners of the lower portion of the case 3. For more convenient filling, the hollow of the box body 3 forms an upper opening and a lower opening, the hollow of the bottom plate 4 forms a single-side opening on one side wall, the hollow of the cover plate 1 forms a single-side opening on the side wall, and the opening is welded and sealed or covered with sealant and sealed after the heat insulation material 2 is filled or the vacuum is pumped. The perforation that is used for the cable to pass on box body (box 3 and bottom plate 4) is sealed to be fixed with the kudzuvine root of kudzu vine root of kudzu.

Agland 6 employs an IP68 protection rating to prevent moisture from entering from the vicinity of the agland, resulting in degraded or faulty electrical insulation.

In order to protect the reliability of installation, small solid structures (namely small non-hollow structures) are adopted at small positions of the installation positions of the insulator 8 and the arrowhead 6 on the bottom plate and the box body.

Claims

1. An electric junction box for preventing condensed water is composed of a box body with an opening on one side and a cover plate (1) which is hermetically covered and fixed on the opening of the box body; it is characterized in that the periphery and the bottom of the box body are hollow structures except the perforation part for the cable to pass through; the cover plate (1) is of a hollow structure; the hollow parts of the box body and the cover plate (1) are filled with heat insulating materials (2) or vacuumized.

2. The electrical junction box for preventing condensation as claimed in claim 1, wherein the hollow of the cover plate (1) is formed with a single side opening, the hollow of the box body is formed with a single side opening, and the opening is sealed by welding or by covering with a sealant after filling the insulation material (2) or vacuuming.

3. The electrical junction box for preventing condensation water according to claim 1, wherein the box body is formed by connecting and fixing a box body (3) with an upper opening and a lower opening and a bottom plate (4); the lower part of the box body (3) extends to form uniformly distributed connection lugs (5) with bolt holes formed in the connection lugs, and bolts penetrate through the bolt holes in the connection lugs (5) to be screwed on the bottom plate (4), so that the box body (3) and the bottom plate (4) are connected and fixed.

4. The condensation-preventing electric junction box according to claim 3, wherein the engaging lugs (5) are distributed at four corners of the lower portion of the box body (3).

5. The condensate water preventing electric junction box according to claim 3, wherein the hollow of the case body (3) is formed with an upper and lower opening, the hollow of the bottom plate (4) is formed with a single side opening on one side wall, the hollow of the cover plate (1) is formed with a single side opening on the side wall, and the opening is sealed by welding or by covering with a sealant after filling the heat insulating material (2) or vacuuming.

6. The electrical junction box for preventing condensation as defined in claim 1 or 2, wherein a arrowhead (6) is hermetically fixed to a through hole for a cable to pass through on the box body, the cable (7) is hermetically threaded into the box body through the arrowhead (6), an insulator (8) is fixed to the bottom of the box body, a connection terminal (9) is connected to an end of the cable (7) threaded into the box body, and the connection terminals (9) at ends of two cables (7) to be connected are contacted with each other and screwed to the insulator (8) by a bolt.

7. The electrical junction box for preventing condensation as claimed in claim 3, 4 or 5, wherein the arrowhead (6) is fixed on the through hole for cable passing through on the box body (3) and the bottom plate (4) in a sealing way, the cable (7) passes through the box body through the arrowhead (6) in a sealing way, the insulator (8) is fixed on the bottom plate (4) of the box body, the end part of the cable (7) passing through the box body is connected with the connecting terminal (9), and the connecting terminals (9) at the end parts of the two cables (7) to be connected are contacted with each other and screwed on the insulator (8) by bolts.

8. Condensation-proof electrical connection box according to claim 6, characterized in that the Kuran (6) adopts IP68 protection grade.

9. Condensation-proof electrical connection box according to claim 7, characterized in that the Kuran (6) adopts IP68 protection grade.

10. The condensation water prevention electric junction box according to claim 1 or 2 or 3 or 4 or 5, wherein the heat insulating material (2) is a material having a thermal conductivity lower than that of metal.