JP2001327117A - Terminal box of electric rotating machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a terminal box of an electric rotating machine which can reduce manhour for combining junction surfaces of a terminal box body and a cover by using a fastening bolt, and prevent a rubber packing being crushed. SOLUTION: In this terminal box, the rubber packing 3 is interposed between the terminal box body 2 and the cover 4 which are fastened by using a fastening bolt 5. An insert nut 6 screwing to the fastening bolt 5 is fixed to a position on a junction surface of the terminal box body where the fastening bolt 5 is inserted. The rubber packing 3 is constituted to have a hollow form section disposed at a position opposite to the side surface side of the terminal box body with respect to a flange 6A part. The height H of the flange part 6A of the insert nut 6 is made a height to regulate the amount of compression of the rubber packing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a structure of a terminal box of a rotating electric machine.

[0002]

2. Description of the Related Art The structure of a terminal box used in a conventional rotary electric machine is as shown in FIGS. FIG. 4 is an overall view of a terminal box of a rotary electric machine showing a first conventional technique, and FIG. 5 is an enlarged external view of a terminal box and a cover of FIG. In the figure, 1 is an electric motor, 2 is a terminal box main body, 7 is a fastening bolt, 8 is a rubber packing, and 10 is a cover. The structure is such that the terminal box body 2 attached to the electric motor 1 and the cover 10 are tightly closed by fastening with fastening bolts 7 via a flat rubber packing 8. In this structure, in order to eliminate a gap in the joint surface between the main body 2 of the terminal box and the cover 10, the joint surface between the main body 2 of the terminal box and the cover 10 is machined to be flat to each other, and the rubber packing 8 is sandwiched therebetween. I have. FIG. 6 shows a second conventional technique. FIG. 6 is a sectional view of a terminal box and a cover showing a second conventional technique. A cover 4 having an L-shaped outer periphery is used, and a joint surface between the main body 2 of the terminal box and the cover 4 is made of flat rubber. The rubber packing 9 is bent into an L-shape by having an L-shaped portion on the outer circumference of the cover 4 by tightening with the fastening bolt 7 via the packing 9, and the L on the outer circumference of the cover 4 and the main body 2 of the terminal box. A sealed state is formed at the portion of the compression allowance of the rubber packing 9 sandwiched between the letter-shaped portions.

[0003]

However, the conventional structure has the following problems. (1) In the structure of the first prior art, in order to eliminate the gap between the joining surfaces of the main body 2 and the cover 10 of the terminal box,
In addition to measures to increase the surface accuracy of the joint surface by machining,
Since measures are taken to increase the number of fastening bolts 7 and to reduce the pitch interval between the fastening bolts 7, there is a disadvantage that it takes time and effort to assemble them. (2) In the structure of the second prior art, although the number of fastening bolts 7 is reduced, the terminal box main body 2 and the outer periphery are L
When the flat rubber packing 9 is used for a long period of time between the cover 4 and the cover 4 bent in the shape of a triangle, the rubber packing 9 is crushed and finally collapsed, and the sealing ability is lost. there were. The present invention has been made to solve the above problems. Reducing the time and effort required to assemble the joint surface between the terminal box body and the cover with fastening bolts;
Another object of the present invention is to provide a terminal box for a rotating electrical machine that can eliminate both of collapse of a rubber packing and prevention of the collapse.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a first aspect of the present invention is a terminal box for a rotary electric machine having a structure in which a rubber packing is interposed between a main body and a cover of the terminal box with fastening bolts. In the main body of the terminal box, an insert nut is attached to a position where the fastening bolt is inserted in the joint surface of the main body of the terminal box so as to screw with the fastening bolt, and the rubber packing is The insert nut has a hollow shape provided on the side opposite to the side surface of the terminal box main body, and is sandwiched between the terminal box main body and the cover in a tightened state of the rubber packing. The height of the flange portion of the insert nut is adjusted by the rubber so that the joint surface can be sealed. It is obtained by the height to regulate the compression margin of Kkin.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an overall view of a rotary electric machine showing an embodiment of the present invention, in which a terminal box and a cover are shown as sectional views, FIG. 2 is an enlarged sectional view of the terminal box and the cover of FIG. 1, and FIG. It is explanatory drawing which shows the state before fastening a terminal box and a cover in 2 A part. The same reference numerals are given to the same components as those of the related art, and the description thereof will be omitted. In the figure, 3 is a rubber packing, 4 is a cover, 5 is a fastening bolt, 6 is an insert nut, and 6A is an insert nut 6.
It is a flange part. The differences between the present invention and the conventional one are as follows. The main body 2 of the terminal box is shown in FIG.
As shown in FIG. 2, an insert nut 6 provided to be screwed with the fastening bolt 5 is attached to the joint surface of the main body 2 of the terminal box at a position where the fastening bolt 5 is inserted. As shown in FIG. 3, the rubber packing 3 has a hollow cross section provided so as to be located on the side opposite to the side surface of the main body 2 of the terminal box with respect to the flange 6A of the insert nut 6. It is configured. In this case, the flange portion 6 of the insert nut 6 is sealed so that the joint surface sandwiched between the main body 2 of the terminal box and the cover 4 can be sealed when the rubber packing 3 is tightened.
The height H of A is a height that regulates the compression allowance of the rubber packing. In such a configuration, when fastening the cover 4 to the main body 2 of the terminal box, the insert nut 6 is attached to the main body 2 of the terminal box, and the rubber packing 3 is fixed to the inside of the flange portion 6A of the insert nut 6 by bonding. After that, the rubber packing 3 is tightened while screwing the fastening bolts 5 arranged on the outer periphery of the cover 4 into the insert nuts 6 in the direction of the arrow to seal the joint surface sandwiched between the main body 2 of the terminal box and the cover 4. . At this time, the rubber packing 3 is tightened until the hollow portion of the rubber packing 3 is crushed, but the tightening state of the rubber packing 3 is regulated by the height H of the flange portion 6A of the insert nut 6. Even if an excessive fastening force is accidentally applied to the joint surface between the main body 2 and the cover 4 of the terminal box, the rubber packing 3 will not be crushed and damaged. Therefore, the insert nut 6 screwed with the fastening bolt 5 is attached to the joint surface of the main body 2 of the terminal box at the position where the fastening bolt 5 is inserted, and the rubber packing 3 is attached to the terminal 6 with respect to the flange portion 6A of the insert nut 6. The insert nut 6 has a height H that regulates a compression allowance of the rubber packing. The box H has a hollow section provided on the side opposite to the side surface of the box body 2. With this configuration, the number and time required for assembling with the fastening bolts can be reduced. Moreover, rubber packing 3
Since the hollow portion crushed by the elastic deformation has a restoring force, a high sealing force can be obtained between the joining surfaces of the terminal box body 2 and the cover 4 and the rubber packing 3 is prevented from being crushed. can do.

[0006]

As described above, according to the present invention, an insert nut which is screwed with a fastening bolt is attached to the joint surface of the terminal box main body at a position where the fastening bolt is inserted. It has a hollow section provided so as to be located on the side opposite to the side surface of the terminal box body with respect to the flange portion, and the height of the flange portion of the insert nut,
The height of the rubber packing restricts the compression allowance, so that the number and time required for assembling with the fastening bolts can be reduced. In addition, since the rubber packing has a restoring force in the hollow portion crushed by elastic deformation, a high sealing force can be obtained between the joint surface of the terminal box body and the cover, and the collapse of the rubber packing can be prevented. Can be prevented.

[Brief description of the drawings]

FIG. 1 is an overall view of a rotating electric machine showing an embodiment of the present invention, in which a terminal box and a cover are shown in a sectional view.

FIG. 2 is an enlarged sectional view of a terminal box and a cover of FIG.

FIG. 3 is an explanatory view showing a state before fastening a cover to a terminal box in a portion A of FIG. 2;

FIG. 4 is an overall view of a terminal box of a rotating electric machine showing a first related art.

FIG. 5 is an enlarged external view of a terminal box and a cover of FIG. 4;

FIG. 6 is a sectional view of a terminal box and a cover showing a second conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Motor 2 Terminal box main body 3 Rubber packing 4 Cover 5 Fastening bolt 6 Insert nut 6A Flange part

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5G361 AA06 AB12 AC01 AC03 AC13 AE01 5H605 AA00 AA08 BB05 CC06 EC14 EC15 EC18 FF08 GG06

Claims (1)

[Claims] 1. A terminal box for a rotating electric machine having a structure in which a rubber packing is interposed between a main body of a terminal box and a cover with a fastening bolt, wherein the main body of the terminal box is provided at a joint surface of the main body of the terminal box. At the position where the fastening bolt is inserted, an insert nut is attached so as to be screwed with the fastening bolt, and the rubber packing is located on the side opposite to the side surface of the terminal box body of the insert nut. The height of the flange portion of the insert nut is adjusted so that the joint surface sandwiched between the main body of the terminal box and the cover can be sealed in a tightened state of the rubber packing. A height for regulating the compression allowance of the rubber packing. Terminal box for converter.