JPH06133487A - Liquid sealed dynamo electric machine - Google Patents

Abstract

PURPOSE:To reduce the length in the axial direction of a liquid-sealed rotating electric machine in which liquid is sealed, and to reduce an installation space of the machine. CONSTITUTION:An equalizing bellows which is conventionally disposed in the axial direction is housed in a recess 1a between outer peripheral ribs which is an unused area, and hence the equalizing bellows will not project outside an apparatus, thereby a reduction in size of a liquid sealed dynamo electric machine.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid-filled rotary electric machine in which a liquid is sealed inside to balance the internal and external pressures of equipment.

[0002]

2. Description of the Related Art FIG. 3 is a sectional view of a conventional liquid-filled rotary electric machine of this type, and FIG. 4 is a sectional view taken along line XX. In the figure, 1 is a frame, 2 is a stator core installed in the frame 1, 3 is a stator winding, 4 is a rotor core, 5 is a rotor winding, 6 is a shaft, 7 is one bracket, Reference numeral 8 is a bearing, 9 is an end cover for pressing the bearing 8, 10 is a seal support, 11 is a shaft seal supported by the seal support 10,
12 is the other bracket, 13 is a bearing, 14 is an end cover, 15 is an end cover, 16 is a bellows case provided on the bracket 12, 17 is a pressure equalizing bellows housed therein, 18 is a bellows retainer, 19 Indicates an enclosed liquid.

Next, the operation will be described. When the rotating electric machine is operated, heat is generated due to resistance loss according to the load current and friction loss of liquid, and the temperature rises. Although the enclosed liquid 19 expands due to this temperature rise, the pressure rise is absorbed by the pressure equalizing bellows 17. That is, the bellows 17 stands still at a position where the internal pressure and the external pressure of the rotating electric machine are balanced. Here, the bellows 17 contracts in the direction of arrow A when the internal pressure increases, and extends in the direction of arrow B when the external pressure increases. The rotary electric machine having the above structure has a great effect as being used underwater.

[0004]

As described above, since the pressure equalizing bellows of the conventional liquid-sealed rotary electric machine is mounted on the outer side of the bracket 12 in the axial direction, it has a drawback that it becomes long in the axial direction.

The present invention has been made in order to solve the above-mentioned drawbacks, and an object thereof is to shorten the entire axial length and to reduce the size.

[0006]

In the liquid-filled rotary electric machine according to the present invention, a pressure equalizing device is mounted in a recess between ribs on the outer peripheral portion of the frame.

[0007]

Since the pressure equalizing device according to the present invention is installed so as to be housed within the frame, it does not protrude outside the equipment of the rotary electric machine, and therefore, the axial length can be made shorter than the conventional one, and downsizing can be achieved. it can.

[0008]

EXAMPLES Example 1. An embodiment of the present invention will be described below with reference to the drawings. In FIGS. 1 and 2 corresponding to FIGS. 3 and 4, 1 is a frame, 20 is a pressure equalizing bellows housed in the inter-rib recess 1a so as not to project around the frame, and 21 is a pressure equalizing bellows attachment. Tool, 22 is frame 1
The communication hole provided in a part of is shown. This communication hole 22
Shall be provided according to the size of the equipment. Since the operation is the same as the conventional one, the description is omitted.

[0009]

As described above, according to the present invention, since the pressure equalizing bellows is provided in the concave portion which is an unused portion on the outer peripheral side of the frame, the axial length can be greatly reduced, and the rotating electric machine Miniaturization can be achieved. Also, the installation space including the partner machine can be reduced, and the overall cost can be reduced.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a liquid-filled rotary electric machine according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line YY of FIG.

FIG. 3 is a cross-sectional view of a conventional liquid-filled rotary electric machine.

4 is a sectional view taken along line XX of FIG.

[Explanation of symbols]

 1 Frame 1a Outer recess of frame 2 Stator core 4 Rotor core 6 Shaft 7, 12 Bracket 19 Filled liquid 20 Pressure equalizing bellows 22 Communication hole

Claims (1)

[Claims] 1. A rotary electric machine in which a liquid is sealed in the equipment and a pressure equalizing device communicating with the inside of the equipment is provided to balance the internal and external pressures of the equipment. The rotary electric machine is formed on an outer peripheral portion of a frame of the rotary electric machine. A liquid-filled rotary electric machine, characterized in that a pressure equalizing bellows, which communicates with the inside of the device through a communication hole formed in the frame, is housed in the inter-rib recess.