JPH09182376A - Electric motor for entirely sealed compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To minimize a refrigerating machine oil discharged from a refrigerant pipe by gathering an oil mist which fills the inside of an entirely sealed compressor on the inner surface of the end ring of a rotor by utilizing the rotation of the rotor to collect it into an oil basin located in the lower part of the entirely sealed compressor. SOLUTION: An oil mist with which the inside of an entirely sealed compressor is filled by the rotation of a spiral blade integrated with the end ring 2 of a rotor by die casting is gathered on the inner surface of the rotor. Also, a groove 4 or a hole passing through from one end surface of the rotor to the other end surface is formed, thereby collecting the oil gathered on the inner surface of the end ring of the rotor into an oil basin 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hermetic compressor electric motor used in a refrigerator compressor.

[0002]

2. Description of the Related Art Conventionally, an electric motor for a hermetically sealed electric compressor is shown in FIG.
0 and FIG. 11 or the rotor of the structure shown in FIG. 12 and FIG. 13 was used.

FIG. 10 is a view showing an end ring end surface of a rotor of a motor for a hermetic compressor of a first conventional example.
1 is a sectional view taken along line EE of FIG. In FIG. 11, 3 is a rotor core, and the rotor conductor 5 and the end ring 2
Are die-cast integrally. The end ring 2 has a flat end surface, and even if the rotor rotates, it does not particularly affect the oil mist existing around.

FIG. 12 is a view showing an end ring end surface of a rotor of a motor for a hermetic compressor of a second conventional example.
3 is a sectional view taken along line FF in FIG. In FIG. 13, 3 is a rotor core, and the rotor conductor 5, the end ring 2 and the radial blade 10 are integrally die-cast. In this case, as the rotor rotates, the radial vanes 10 form an air flow in the outer diameter direction to cool the rotor and the stator windings, so that the temperature rise is suppressed as compared with the first conventional example. Have advantages.

[0005]

In recent years, there is an urgent need to change to a refrigeration system using a new refrigerant that does not destroy the ozone layer in order to prevent the ozone layer from being depleted of CFCs.

The new refrigerant used in this refrigeration system has a poor affinity with the refrigerating machine oil used for lubricating the motor for a hermetic compressor, that is, it has a drawback that it is difficult to mix and easily separated. Refrigerating machine oil that has flowed out of the refrigerant discharge pipe is separated and left in the middle of the refrigeration cycle, and only the new refrigerant is likely to return to the hermetic compressor.

As a result, in the conventional example, particularly in the motor for the hermetic compressor having the rotor as in the second conventional example, the oil mist is urged toward the refrigerant discharge pipe by the air flow in the outer diameter direction, so that it is frozen. A large amount of machine oil will flow out from the refrigerant discharge pipe during the refrigeration cycle, and the refrigerating machine oil in the fully hermetic compressor will decrease and lubrication will not be sufficiently performed, and the life time of the hermetic compressor will be extremely shortened. The evil was occurring.

An object of the present invention is to provide an electric motor for a totally hermetic compressor in which refrigerating machine oil does not easily flow out in order to prevent this adverse effect.

[0009]

In order to achieve this object, a motor for a hermetic compressor of the present invention comprises a spiral blade integrally formed on an end ring of a rotor and one end surface of the rotor. It has a structure of a groove or a hole penetrating to the other end surface.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is a rotor obtained by integrally die-casting a rotor conductor and an end ring on a rotor core, the rotor conductor being provided on an end face of the end ring. And a spiral blade integrally formed with the end ring, and a groove penetrating from one end face to the other end face of the rotor in the shaft hole of the rotor core. The oil mist collected in the inner diameter portion by the rotation of the blades has the action of being collected in the oil sump through the groove that penetrates the rotor shaft hole from one end surface of the rotor to the other end surface.

According to a second aspect of the present invention, there is provided a rotor obtained by integrally die-casting a rotor conductor and an end ring on a rotor core, wherein the end surface of the end ring is integrally formed with the rotor conductor and the end ring. By providing a molded spiral blade and providing a hole penetrating from the one end surface to the other end surface of the rotor on the inner diameter side of the spiral blade, the rotation of the spiral blade The oil mist collected in the inner diameter portion has a function of being collected in the oil sump through a hole penetrating from one end surface to the other end surface of the rotor provided on the inner diameter side of the spiral blade.

According to a third aspect of the present invention, there is provided a rotor obtained by integrally die-casting a rotor conductor and an end ring on a rotor core, wherein the end face of the end ring is integrally formed with the rotor conductor and the end ring. A spiral blade formed and an end plate fixed to the end surface of the spiral blade are provided, and a groove penetrating from one end surface of the rotor to the other end surface is provided in the shaft hole of the rotor core. The end plates and the spiral blades form a ventilation path that guides the oil mist in the inner diameter direction, so that the oil mist collected in the inner diameter direction can be more efficiently collected in the rotor shaft hole. It has the effect of being collected in the oil sump through a groove that penetrates from one end face to the other end face.

According to a fourth aspect of the present invention, there is provided a rotor obtained by integrally die-casting a rotor conductor and an end ring on a rotor iron core, wherein the end face of the end ring is integrally formed with the rotor conductor and the end ring. A spiral blade formed and an end plate fixed to the end surface of the spiral blade are provided, and a hole penetrating from one end surface of the rotor to the other end surface is provided on the inner diameter side of the spiral blade. The end plates and the spiral blades form an air passage that guides the oil mist in the inner diameter direction, so that the oil mist collected more efficiently in the inner diameter direction is closer to the inner diameter side than the spiral blades. The rotor has a function of being collected in an oil reservoir through a hole penetrating from one end surface to the other end surface of the rotor.

Hereinafter, an embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIG. FIG. 9 is a cross-sectional view showing the configuration of a hermetic compressor in which the electric motor of the present invention is used. The refrigerant sucked through the refrigerant suction pipe 11 from the refrigeration cycle is compressed by the pump impeller 12 and then stored in the electric motor. It is guided to the electric motor housing through a passage (not shown) to the unit, and is sent out to the refrigerant cycle at high pressure from the refrigerant discharge pipe 9 provided in the electric motor housing.

(Embodiment 1) FIG. 1 is a side view of a rotor end ring of a motor for a hermetic compressor according to a first embodiment of the present invention, and FIG. 2 is a sectional view taken along line AA of FIG. is there.
In FIG. 2, 3 is a rotor core, the rotor conductor 5 and the end ring 2 and the spiral blade 1 are integrally die-cast, and the shaft hole has a groove penetrating from one end face to the other end face. 4 are provided. The operation will be described below.

With the above structure, the oil mist existing around the rotor is collected by the spiral blade 1 on the inner diameter side of the end ring of the rotor when the rotor rotates, and further, from one end surface of the rotor to the other end surface thereof. It is guided to the oil sump 8 through the groove 4 penetrating up to. Thereby, the refrigerating machine oil flowing out from the refrigerant discharge pipe together with the refrigerant can be reduced.

(Second Embodiment) FIG. 3 is a side view of a rotor end ring of an electric motor for a hermetic compressor according to a second embodiment of the present invention, and FIG. 4 is a sectional view taken along line BB of FIG. is there.
In FIG. 4, 3 is a rotor core, the rotor conductor 5 and the end ring 2 and the spiral blade 1 are integrally die-cast, and the end plate 6 is fixed to the end surface of the spiral blade 1. Further, the shaft hole is provided with a groove 4 penetrating from one end surface to the other end surface. The operation will be described below.

With the above-mentioned structure, the oil mist existing around the rotor is moved toward the inner diameter by the air passage formed by the spiral blades 1 and the end plates 6 when the rotor is rotated. It is efficiently collected and is guided to the oil sump 8 through the groove 4 penetrating from one end surface of the rotor to the other end surface. Thereby, the refrigerating machine oil flowing out from the refrigerant discharge pipe together with the refrigerant can be greatly reduced.

(Third Embodiment) FIG. 5 is a side view of a rotor end ring of an electric motor for a hermetic compressor according to a third embodiment of the present invention, and FIG. 6 is a sectional view taken along line CC of FIG. is there.
In FIG. 6, reference numeral 3 denotes a rotor core, in which the rotor conductor 5, the end ring 2 and the spiral blade 1 are integrally die-cast, and the inner diameter side of the spiral blade 1 from one end face to the other A hole 7 that penetrates to the end face is provided. The operation will be described below.

With the above structure, the oil mist existing around the rotor is collected by the spiral blade 1 on the inner diameter side of the end ring of the rotor when the rotor rotates, and further, from one end surface to the other end surface of the rotor. It is guided to the oil sump 8 through the hole 7 that extends up to. Thereby, the refrigerating machine oil flowing out from the refrigerant discharge pipe together with the refrigerant can be reduced. Since this embodiment does not require a groove in the shaft hole, there is an advantage that the fixing strength between the shaft and the iron core can be made larger than that of the invention of claim 1.

(Fourth Embodiment) FIG. 7 is a side view of a rotor end ring of an electric motor for a hermetic compressor according to a fourth embodiment of the present invention, and FIG. 8 is a sectional view taken along line DD of FIG. is there.
In FIG. 8, reference numeral 3 is a rotor core, the rotor conductor 5 and the end ring 2 and the spiral blade 1 are integrally die-cast, and the end plate 6 is fixed to the end surface of the spiral blade 1. Further, a hole 7 that penetrates from one end face to the other end face is provided on the inner diameter side of the spiral blade. The operation will be described below.

With the above-described structure, the oil mist existing around the rotor is moved toward the inner diameter by the air passage formed by the spiral blade 1 and the end plate 6 when the rotor is rotated, and the oil mist is caused by the inner diameter of the end ring of the rotor. It is efficiently collected and is guided to the oil sump 8 through the hole 7 that penetrates from the one end surface of the rotor to the other end surface on the inner diameter side of the spiral blade. Thereby, the refrigerating machine oil flowing out from the refrigerant discharge pipe together with the refrigerant can be greatly reduced.

[0023]

As described above, according to the present invention, the end ring 2
The oil discharge amount of the hermetic compressor can be reduced by providing the spiral blade 1 integrally die-casted with and the groove 4 or the hole 7 penetrating from the end surface to the other end surface of the rotor. Further, by fixing the end plate 6 to the end surface of the spiral blade 1 by caulking, it is possible to realize an excellent electric motor for a hermetic compressor that can further reduce the oil discharge amount of the hermetic compressor.

[Brief description of the drawings]

FIG. 1 is a side view of a rotor end ring of an electric motor for a hermetic compressor according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG. 1;

FIG. 3 is a side view of a rotor end ring of an electric motor for a hermetic compressor according to a second embodiment of the present invention.

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

FIG. 5 is a side view of a rotor end ring of an electric motor for a hermetic compressor according to a third embodiment of the present invention.

6 is a sectional view taken along line CC of FIG.

FIG. 7 is a side view of a rotor end ring of a motor for a hermetic compressor according to a fourth embodiment of the present invention.

8 is a sectional view taken along line DD of FIG. 7;

FIG. 9 is a cross-sectional view of a hermetic compressor in which a motor for a hermetic compressor according to the present invention is incorporated.

FIG. 10 is a side view of a rotor end ring of an electric motor for a hermetic compressor of a first conventional example.

11 is a sectional view taken along line EE of FIG.

FIG. 12 is a side view of a rotor end ring of a second conventional example of a hermetic compressor electric motor.

13 is a sectional view taken along line FF of FIG.

[Explanation of symbols]

 1 spiral blade 2 end ring 3 rotor core 4 groove 5 rotor conductor 6 end plate 7 hole 8 oil sump 9 refrigerant discharge pipe 10 radial blade 11 refrigerant suction pipe 12 pump impeller

Claims (4)

[Claims] 1. A rotor obtained by integrally die-casting a rotor conductor and an end ring on a rotor core, wherein a spiral blade integrally formed with the rotor conductor and the end ring is formed on an end surface of the end ring. An electric motor for a hermetic compressor, wherein the shaft hole of the rotor core is provided with a groove penetrating from one end surface to the other end surface of the rotor. 2. A rotor obtained by integrally die-casting a rotor conductor and an end ring on a rotor core, wherein a spiral blade integrally formed with the rotor conductor and the end ring is formed on an end surface of the end ring. An electric motor for a totally hermetic compressor, characterized in that a hole is provided which penetrates from the one end face to the other end face of the rotor on the inner diameter side of the spiral blade. 3. A rotor obtained by integrally die-casting a rotor conductor and an end ring on a rotor core, wherein a spiral blade integrally formed with the rotor conductor and the end ring is provided on an end surface of the end ring. An end plate fixed to the end face of the spiral blade, and a groove penetrating from one end face to the other end face of the rotor in the shaft hole of the rotor core. Electric motor for compressor. 4. A rotor obtained by integrally die-casting a rotor conductor and an end ring on a rotor core, wherein a spiral blade integrally formed with the rotor conductor and the end ring is formed on an end surface of the end ring. An end plate fixed to the end surface of the spiral blade, and a hole penetrating from one end surface of the rotor to the other end surface on the inner diameter side of the spiral blade. Electric motor for hermetic compressor.