JPH1066306A - Totally-enclosed outer fan-cooled motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively cool the bearing box of a totally-enclosed outer fan- cooled motor which becomes high temperature with inside air by positioning a pipeline in a state where the inlet and outlet of the pipeline are respectively faced to the cold air outlet of an air cooler and the bearing box and providing a partition composed of a heat insulating cover so that a separate space can be formed for the bearing box in the main body of the motor. SOLUTION: A pipeline 10 is positioned so that the inlet and outlet of the pipeline 10 can be respectively faced to the cold air outlet of an air cooler 4 and a bearing box 9 on the side of the main body 1 of a totally-enclosed outer fan-cooled motor opposite to the directly coupling side. In addition, a cover 11 is provided as a partition for forming a separate space in the main body 1 for the bearing box 9 by partitioning the internal space of the main body 1 on the directly coupling side. The cover 11 is coated with a heat insulating material. Since the bearing box 9 is housed in a separated space from the space for housing a rotor 5 and stator 6 which become heat sources, the bearing box 9 can be isolated thermally. In addition, since the outlet of the pipeline 10 is faced to the separate space, the box 9 can be cooled extremely effectively.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a totally enclosed fan-type electric motor, and more particularly to a cooling structure for a bearing housing.

[0002]

2. Description of the Related Art Some fully enclosed fan-type electric motors include an air cooler for circulating and cooling the inside air of the electric motor body. FIG. 2 shows an example of this type of electric motor. As for the inside air of the electric motor main body 1, the hot air is sent to the air cooler 4 by the internal fan 3 on the directly connected side of the shaft 2, and the heat is exchanged inside the air cooler 4. Cool air is blown to the opposite side of the shaft 2 to cool the rotor 5 and the stator 6 which are heat sources, and follow a circulation path of reaching the directly connected side.

On the other hand, the outside air that cools the air cooler 4 is guided by a wind guide 7 and is sent to the air cooler 4 by an external fan 8 attached to the opposite side of the shaft 2 and becomes cooling air discharged from the side. ing. As a result, heat exchange between the inside air and the outside air of the motor main body is performed by the air cooler 4, the inside air is cooled, and the outside air discharges the heat of the inside air to the outside.

[0004]

In the structure shown in FIG. 2, when the internal temperature of the electric motor body is viewed, the air is cooled sufficiently by the air cooler on the opposite side, so that the cooling is effectively performed. And the inside air passing through the heat source of the stator 6 has a high temperature on the directly connected side, and particularly in the bearing box 9 on the directly connected side, becomes extremely high under the influence of the high temperature inside air.

The present invention has been made in view of the above problems, and provides a totally enclosed fan motor in which a bearing box, which is heated to a high temperature by the inside air, is effectively cooled.

[0006]

SUMMARY OF THE INVENTION The present invention, which achieves the above objects, has the following features to effectively cool a bearing housing. In a fully-closed external fan-type electric motor in which an air cooler is mounted on the electric motor main body to circulate the internal air of the electric motor main body,
A pipe having an inlet facing the cool air outlet of the air cooler and an outlet facing the bearing box, and a partition wall of a heat insulating cover for placing the bearing box as a part of the internal space of the motor body as a separate space, It is characterized by the following.

[0007] Cold air is blown directly into the bearing box, which becomes hot,
In addition, this bearing box is separated from the other internal space by the heat insulating cover, and the temperature of the bearing box is kept high.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Here, an example of an embodiment of the present invention will be described with reference to FIG. In FIG. 1, the same parts as those in FIG. 2 are denoted by the same reference numerals. That is, 1 is a motor body, 2 is a shaft, 3 is an inner fan, 4 is an air cooler, 5 is a rotor, 6 is a stator, 7 is a wind guide, 8 is an outer fan,
9 is a bearing box.

A pipe 10 is located on the opposite side of the motor body 1 so as to face the cool air outlet (air outlet) of the air cooler 4.
And the outlet of the pipe 10 faces the bearing box 9. That is, the cool air outlet of the air cooler and the bearing box 9 are directly communicated with each other through the pipe 10.

Further, a cover 11 serving as a partition is provided to partition the internal space of the motor body 1 on the directly connected side and to make the bearing housing 9 a space separate from the internal space. The cover 11 is covered with a heat insulating material. For this reason, the bearing box 9 is placed in a space different from the internal space of the rotor 5 and the stator 6 serving as a heat source, so that heat is cut off. The cooling of the bearing box 9 becomes extremely effective by facing the outlet of the pipe 10 to this space.

Furthermore, in order to make the flow of cooling air from the outlet of the pipe 10 smooth in the space defined by the heat insulating cover 11, the exhaust port of this space faces the air intake side of the inner fan 3 where the negative pressure increases. I am trying.

Although only one pipe 10 is shown in FIG. 1 as described above, a plurality of pipes may be provided.

[0013]

As described above, according to the present invention, in a fully-closed external fan-type electric motor on which an air cooler is mounted, only the bearing box is cut off and cooled and thermally shielded by piping or a cover provided with a heat insulating material. The box can be cooled effectively.

[Brief description of the drawings]

FIG. 1 is a half sectional view of an example of an embodiment of the present invention.

FIG. 2 is a half sectional view of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Motor main body 2 Shaft 3 Inner fan 4 Air cooler 8 Outer fan 9 Bearing box 10 Piping 11 Cover

Claims (1)

[Claims] 1. A fully enclosed fan motor in which an air cooler is mounted on a motor body to circulate the internal air of the motor body, the pipe having an inlet facing a cold air outlet of the air cooler and an outlet facing a bearing box, A totally enclosed fan-shaped electric motor, comprising: a partition wall of a heat insulating cover so as to place the bearing box with a part of the internal space of the electric motor body as another space.