JPS6019475Y2 - Bus duct connection - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a connection part of a bus duct, and aims to improve the heat dissipation effect and ensure a sufficient creepage distance without increasing the external shape of the connection part.

Conventionally, as shown in FIG. 1, the connecting portion of this type of bus duct has a plurality of conductors 1a and 1b to be connected.

The ends of 2a, 2b and 3a, 3b are faced to each other and a conductive connecting member 6 is attached thereto, and a flat insulating separator 4 is interposed between each different phase conductor and between the outermost conductor and the bus duct housing. , fit the insulating cylinder 7 into the bolt insertion holes of the conductive connecting member 6, bus duct housing 5, and insulating separator 4, screw the nut 9 onto the tightening bolt 8 passed through the insulating cylinder 7, and attach the tightening plate 10. It is connected via bulk tightening.

However, in the above conventional structure, the flat insulating separator 4 and the bus duct housing 5 and the flat insulating separator 4 and the conductive connecting member 6 are tightly tightened on their entire surfaces, and the conductors 1a, 1b12a, 2b1
The insulating separator 4 has a flat creepage distance that has a poor dissipation effect on the heat generated from 3a and 3b, causing a large temperature rise at the connection part, and causing electric leakage accidents between conductors of different phases and between the outermost conductor and the bus duct housing. It is only the thickness of

Therefore, in order to secure the required creepage distance, it is necessary to increase the thickness of the insulating separator 4, which has the drawback of increasing the weight of the connection portion.

This invention was proposed to eliminate this drawback.
Instead of the above-mentioned insulating separator 4, as shown in FIG.
2 or an insulating separator 17 having convex portions 16 formed on one side on the left and right sides of the bolt insertion hole 14 as shown in FIG.

4 and 5 are examples using the insulating separator 13 shown in FIG. 2. When the insulating separator 13 is inserted between each different phase conductor and between the outermost conductor and the housing,
The convex portion 12 of No. 3 is positioned so as to press the entire or part of the contact surface between the conductor and the conductive connection member, and a spring member such as a rectangular leaf spring or Belleville washer is used to press the convex portion 12 on both outsides of the housing. 18, and the conductive connecting member 6, housing 5, insulating separator 13, and spring member 18 are all tightened together by passing bolts 8 through them and tightening nuts 9.

FIG. 6 shows an example using the insulating separator 17 shown in FIG.
6 are joined and inserted, and an insulating separator 17 is inserted between the outermost conductor and the housing with the protrusion 16 facing the housing side.
This is the inserted arrangement.

Since the present invention has the above configuration, a space 19 or 20 is formed between the insulating separator 13 or 17 and the housing 5 or the conductive connecting member 6 by the convex portion 12 or 16, so that the heat generated from each conductor is is effectively dissipated, which is effective in reducing the temperature rise at the connection area.

The tightening force of the bolt 8 acts concentratedly on the convex portion 12 or 16 of the insulating separator 13 or 17, so the contact surface between the conductor and the conductive connecting member has the above-mentioned force. Force acts effectively in tightening.

Furthermore, compared to the conventional connection structure where the creepage distance was simply the thickness of the insulating separator, the example in Figure 4 of the present invention has an additional creepage distance of (211+23), and the example in Figure 6 has an additional distance of (2h).
+22) or (h + a), so an extremely effective space can be obtained, and sufficient creepage distance can be secured between the conductors of different phases and between the outermost conductor and the housing. .

Therefore, the insulating separator can be made thinner, and the outer shape of the connecting portion can be reduced.

Incidentally, as shown in the example in FIG. 3, a cylindrical portion 15 protruding from one side may be formed at the periphery of the bolt insertion hole 14 (to further increase the creeping distance).

[Brief explanation of drawings]

Figure 1 is a vertical cross-sectional view of a conventional bus duct connection, Figures 2 and 3
The figure is a partially cutaway perspective view of the insulating separator used in the bus duct connection of the present invention, Figure 4 is a vertical sectional view of the bus duct connection using the insulating separator of Figure 2, and Figure 5 is a partially cutaway view FIG. 6 is a longitudinal sectional view of a bus duct connecting portion using the insulating separator of FIG. 3. 1a, lbt 2at 2b, 3at 3b are conductors, 4.13.17 are insulating separators, 5 is bus duct housing, 11, 14 are bolt insertion holes, 7 is insulating cylinder, 8
1 is the tightening bolt, 9 is the nut, 10 is the tightening plate, 12,1
6 is a convex portion, 15 is a cylindrical portion, 18 is a spring member, 19.20
is a space, and 6 is a conductive connecting member.

Claims (1)

[Claims for Utility Model Registration] The ends of the conductors to be connected are faced to each other and attached to a conductive connecting member, and an insulating separator is interposed between each different phase conductor and between the outermost conductor and the bus duct housing, In a bus duct that is tightened and connected with bolts, the insulating separator presses the contact surface between the conductive connecting member and the conductor on the left and right of the bolt insertion hole of the insulating separator. A connecting part of a bus duct in which a convex part is formed at a position, and the convex part is tightened and pressed using a spring member and a bolt to form a heat dissipation space between the left and right convex parts.