JP2707995B2 - Liquid cooled rotary electric machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to cooling of a rotating electric machine such as a generator.

[0002]

2. Description of the Related Art As a method for cooling a rotating electric machine such as a generator from the outside by using a liquid refrigerant, a pipe is spirally wound around an outer peripheral portion of a housing as shown in Japanese Patent Application Laid-Open No. H06-070507. Method of passing refrigerant, Heikai Hei 450
As shown in FIG. 59, there is known a method in which a flow path for passing a liquid refrigerant is provided on the outer peripheral portion of a housing, and further arranged on the outer peripheral portion so as to cover a cylindrical housing.

[0003]

However, all of them have the following disadvantages. JP-A-6-0
In 70507, since the passage of the liquid refrigerant is connected, the refrigerant does not all flow out even if the outlet is opened at the time of refrigerant exchange. For this reason, the replacement is difficult.

In Japanese Utility Model Laid-Open Publication No. 3-45059, the number of parts is increased because the parts constituting the cylindrical part and the parts necessary for holding the rotating part are separate, and the axial center of the rotating part and the axial center of the stator core are also increased. However, there is a disadvantage that it is easily displaced. Also,
Since the sealing of the cooling liquid passage is performed by a single O-ring, there is a possibility that the liquid refrigerant may flow into the rotating electric machine when the sealing becomes defective, resulting in poor reliability.

SUMMARY OF THE INVENTION The present invention provides a liquid-cooled rotating system which is easy to replace the refrigerant, has a small number of parts, does not cause the shaft center of the rotating part to be displaced from the shaft center of the stator core, and has high reliability against leakage of the liquid refrigerant. It is an object to provide an electric machine.

[0006]

According to the present invention, in order to solve the above-mentioned problems, the present invention is characterized in that one end is open, the other end has a bottom part, and the other end has a bearing holding part in the center part. And
And a bottomed substantially cylindrical front housing having a cylindrical portion, and also having one end open, having a bottom portion at the other end, a bearing holding portion at the center of the other end, and a cylindrical portion. A rear housing having a substantially cylindrical shape with a bottom and having a diameter different from that of the front housing and being coaxially opposed to the front housing to form a cylindrical space between the cylindrical portions. A stator coaxially fitted and held inside the cylindrical portion on the smaller diameter side of one of the front housing and the rear housing, and at least one stator coaxially fitted and held in the bearing holding portion The rear housing is fixed to the front housing via a bearing and coaxially fitted and held in another bearing holding portion. A liquid-cooled rotating electric machine having a rotor fixed to the stator and rotatably rotating within the stator, and having a liquid refrigerant passed through the cylindrical space; as a second aspect, the liquid refrigerant is sealed in the cylindrical space. 2. The liquid-cooled rotary electric machine according to claim 1, wherein an O-ring is used as a means for performing the operation.
The liquid-cooled rotating device according to claim 2, wherein at least two or more O-rings are arranged on a side where the anti-cylindrical space side of the O-ring communicates with the inside of the liquid-cooled rotating electric machine. The liquid-cooled rotary electric machine according to claim 1, wherein a rectifying plate for rectifying the liquid refrigerant is provided in the cylindrical space. 5. A liquid cooling rotary electric machine according to claim 4, wherein a minute gap is provided between the front housing and the rear housing.

[0007]

According to the first aspect of the present invention, both the front housing and the rear housing are open at one end, have a bottom at the other end, and have a bearing holding portion at the center of the other end. And because it has a substantially cylindrical shape with a bottom with a cylindrical portion, the bearing holding portion of the housing and the stator holding portion can be integrally processed, so that the axial center of the rotor and the axial center of the stator do not shift, There is an effect that the number of parts is small. Further, since the liquid refrigerant passes through the cylindrical space, there is an effect that the liquid refrigerant can be easily exchanged.

According to the second aspect of the present invention, since the O-ring is used as means for sealing the liquid refrigerant in the cylindrical space, the liquid refrigerant can be sealed easily and reliably. According to a third aspect of the present invention, at least two O-rings are provided on both end surfaces of the cylindrical space, and at least two O-rings are provided on a side where the anti-cylindrical space side of the O-ring communicates with the inside of the liquid-cooled rotary electric machine. Even if any of at least two or more O-rings on the side where the anti-cylindrical space side of the O-ring communicates with the inside of the liquid-cooled rotary electric machine has a bad seal, the liquid refrigerant is kept in the rotary electric machine. There is no danger of flowing, and there is an effect that reliability is high.

According to a fourth aspect of the present invention, since the liquid refrigerant is rectified by the rectifying plate, there is an effect that heat transfer is improved and a cooling effect is enhanced. The invention of claim 5 includes:
Since all the liquid refrigerant flows to the outside through the minute gap between the current plate and the front housing or the rear housing, there is an effect that the exchange is very easy.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A description will now be given of a generator as an example of a rotating electric machine. FIG. 1 shows a generator according to the present invention, and is a cross-sectional view taken along a central axis of a shaft 13 of the generator 1. The stator 3 is configured by winding a winding around a core formed by stacking sheet-like iron plates, and is coaxially press-fitted and held in an aluminum front housing 2. Front housing 2
Is open at one end, has a bottom 200 at the other end, has a bearing holding portion 201 at the center of the other end, and has a substantially cylindrical shape with a bottom having a cylindrical portion 202.

The rear housing 4 is substantially the same as the front housing 2 and has one end open and the other end provided with a bottom 4.
And a bearing holding portion 401 at the center of the other end.
And has a substantially cylindrical shape with a bottom provided with a cylindrical portion 402. The rear housing 4 made of aluminum is different from the front housing 2 mainly in the diameter of the cylindrical portion 402, and is fitted coaxially facing the front housing 2 to form the cylindrical space 7 between the cylindrical portions 202 and 402. , Bolt 5
Is fixed to the front housing 2.

A liquid refrigerant 6 flows through the cylindrical space 7.
A rectifying plate 8 is formed on the outer periphery of the cylindrical portion 202 of the front housing 2, and a minute gap 9 is provided between the rectifying plate 8 and the inner periphery of the cylindrical portion 402 of the rear housing 4. An O-ring 1 is provided between the outer periphery of the cylindrical portion 202 of the front housing 2 and the inner periphery of the cylindrical portion 402 of the rear housing 4.
0, the front of the generator 1 is sealed with one O-ring 10 and the rear of the generator 1 is sealed with two O-rings, as shown in the figure. The cylindrical portion 4 of the rear housing 4
On the outer periphery of 02, an outlet 14 and an inlet 15 for the liquid refrigerant 6 are provided.

The rotor 11 is also constructed by winding a winding around a core formed by stacking sheet-like iron plates and press-fitting a shaft 13, and a bearing holding portion 201 of the front housing 2 via two front and rear bearings 12. And the bearing holding portion 401 of the rear housing 4, and the stator 3
The generator 1 is rotatably assembled in the inside. At one end of the shaft 13, two annular slip rings 16 made of a conductive material are held by press-fitting or insert molding, and the brush 1 attached to the rear housing 4.
7 slides on its surface to supply power to the windings of the rotor 11. The other end of the shaft 13 is splined and receives power from an engine or the like to rotate the rotor 11.

The current supplied from outside the generator 1 excites the rotor 11 through the brush 17 and the slip ring 16 to form an electromagnet. When the rotor 11 rotates in the stator 3, a voltage is induced in the stator 3 to supply electric power to the outside. At this time, Joule heat is generated in the stator 3 by the current, and heats the generator 1. In order to continuously operate the generator, it is necessary to keep the temperature rise due to this heating within the heat resistance limit of the stator winding. Therefore, in this structure, the liquid refrigerant 6 is circulated in the cylindrical space 7 of the housing part, Absorb the heat of 3 through the housing,
A so-called liquid cooling system is adopted, in which the stator winding is kept within the heat resistance limit.

The liquid refrigerant 6 flows neatly through the cylindrical space 7 by the rectifying plate 8 to cool the generator 1 efficiently. When the liquid refrigerant 6 is replaced, the spout 14 and the inlet 1
When 5 is opened, the liquid refrigerant 6 flows out through the minute gap 9 to the outside. As described above, according to the present invention, not only the two components of the front housing 2 and the rear housing 4 can easily constitute the flow path of the liquid refrigerant 6 but also the liquid refrigerant 6.
Is easy to replace, and even if the seal is broken due to damage to the rear O-ring 10, etc.
Due to the redundancy by 0, the liquid refrigerant 6 does not flow into the generator 1.

The front side of the generator 1 has one O
It is sealed by a ring 10, which is
Should be leaked from the front side,
Because there is no damage as much as when the rear side of the generator 1 leaks.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view along a central axis of a shaft of a generator according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Generator 2 Front housing 200 Bottom 201 Bearing holding part 202 Cylindrical part 3 Stator 4 Rear housing 400 Bottom 401 Bearing holding part 402 Cylindrical part 6 Liquid refrigerant 7 Cylindrical space 8 Straightening plate 9 Micro gap 10 O-ring 11 Rotor 12 Bearing 13 shaft

Claims (5)

(57) [Claims] A bottomed substantially cylindrical front housing having an open end at one end, a bottom at the other end, a bearing holding portion at the center of the other end, and a cylindrical portion; One end is open, the other end has a bottom portion, the other end has a bearing holding portion at the center, and has a cylindrical shape with a bottom portion, and the front housing is mainly a cylinder. A rear housing that is fitted coaxially opposite to the front housing to form a cylindrical space between the cylindrical parts, and a diameter of one of the small diameter side of the front housing and the rear housing. A stator coaxially fitted and held inside the cylindrical portion, and fixed to the front housing via at least one bearing coaxially fitted and held in the bearing holding portion;
A rotor that is fixed to the rear housing through at least one bearing coaxially fitted and held in another bearing holding portion, and that freely rotates in the stator; Liquid-cooled rotating electric machine through liquid refrigerant. 2. The liquid-cooled rotating electric machine according to claim 1, wherein an O-ring is used as means for sealing the liquid refrigerant in the cylindrical space. 3. O-rings are disposed on both end surfaces of the cylindrical space, and at least two or more O-rings are disposed on a side where the anti-cylindrical space side of the O ring communicates with the inside of the liquid-cooled rotary electric machine. The liquid-cooled rotary electric machine according to claim 2, wherein: 4. The liquid-cooled rotary electric machine according to claim 1, wherein a rectifying plate for rectifying the liquid refrigerant is provided in the cylindrical space. 5. The liquid-cooled rotary electric machine according to claim 4, wherein a minute gap is provided between the current plate and the front housing or the rear housing.