JPH05288185A - Closed type compressor - Google Patents

Abstract

PURPOSE:To prevent oil break effectively while heightening the rigidity of a casing and enabling low noise by preventing lubricating oil, mixed into gas refrigerant passing an air gap and the core cut part of a stator, from flowing to a secondary space above a motor and flowing out of the casing. CONSTITUTION:A first oil separator 5 of disk shape is fixed to the upper part of the rotor 22 of a motor 2, and a second oil separator 8 having an opening part 82 inward from the outer peripheral position of the first oil separator 5 is fixed to the inner peripheral surface 13 of a casing 1 above the motor 2 so as to dispose the first oil separator 5 and the second oil separator 8 in proximity to each other. A separated space 9 isolated from a secondary space 7 is formed above the motor 2 by these first and second oil separators 5, 8. A gas passage 10 for communicating the separated space 9 with the secondary space 7 is further formed between the outer peripheral part of the first oil separator 5 and the inner peripheral part around the opening part of the second oil separator 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor having a stator having a core cut portion inside a hermetically sealed casing and a rotor inserted into the stator through an air gap, and a compression element provided below the motor. However, the present invention also relates to a hermetic compressor in which an external discharge pipe opening to the secondary space on the upper side of the motor is provided on the upper part of the hermetic casing.

[0002]

2. Description of the Related Art Conventionally, a hermetic compressor of this type is disclosed in, for example, Japanese Utility Model Laid-Open No. 61-5393, and as shown in FIG.
A motor M including a rotor RT and a rotor RT is installed, a drive shaft K is assembled to the rotor RT, and an oil separation plate A that covers the entire upper portion of the rotor RT is fixed to the upper end of the drive shaft K. Then, the high-pressure gas refrigerant passing through the gap G between the stator ST and the rotor RT is caused to collide toward the inner peripheral surface of the coil end B by the centrifugal force generated by the rotation of the oil separation plate A,
The lubricating oil mixed in the gas refrigerant is separated.

[0003]

By the way, in recent years, the hermetic compressor is required to be miniaturized, and therefore, it is necessary to reduce the height of the casing. If the height of the casing is reduced in this way, the motor M is reduced. The upper secondary space E becomes narrower, the distance from the oil separation plate A to the opening of the discharge pipe F opening to the secondary space E becomes shorter, and the lubricating oil separated by the oil separation plate A becomes There is a problem in that the oil easily flows out from the discharge pipe F and the amount of oil is increased, and the high-pressure gas refrigerant is contained in the rotor RT and the stator S.
Not only passes through the air gap G between the stator ST and the core cut portion D of the stator ST and the closed casing C.
Although it also passes through the gap H formed between the inner peripheral surface of the casing C and the inner peripheral surface of the casing C and flows into the secondary space E above the casing C,
The lubricating oil in the gas refrigerant flowing through the gap H of the core cut portion D cannot be separated by the oil separation plate A, so that the lubricating oil mixed in the gas refrigerant passing through the gap H is It flows into the secondary space E above the motor M,
Outflow from the discharge pipe F to the outside of the casing C,
There is also a problem in that the lubricating oil in the casing C rises.

Further, when operating at a high speed by the inverter control operation, the flow rate of the gas refrigerant increases, so that the oil in the gas refrigerant increases as the flow rate increases, and the oil separation plate A increases due to the increase in the oil. Therefore, there was a problem that the oil could not be completely separated, and the oil separation was insufficient to further increase the oil rise.

The present invention has been invented to solve the above-mentioned problem, and its purpose is to prevent the lubricating oil mixed in the gas refrigerant passing through the air gap or the core cut portion of the stator from being the secondary space above the motor. It is an object of the present invention to provide a hermetic compressor that can effectively prevent the oil from rising by preventing the oil from flowing out to the outside of the casing.

[0006]

In order to achieve the above-mentioned object, the present invention has a stator 21 having a core cut portion 21a above the inside of a hermetically sealed casing 1, and is inserted into the stator 21 via an air gap G. A motor 2 having a rotor 22 to be fitted therein is internally provided with a compression element 3, and a secondary space 7 on an upper side of the motor 2 is provided on an upper part of the closed casing 1.
In a hermetic compressor provided with an external discharge pipe 12 opening to the inside, a disk-shaped first oil separator 5 is fixed to an upper part of the rotor 22, and an inner peripheral surface of the casing 1 above the motor 2 is fixed. The second oil separation body 8 having the opening 82 provided inward from the outer peripheral position of the first oil separation body 5 is fixed to 13, and the second oil separation body 8 and the first oil separation body 5 are fixed. Are arranged in close proximity to each other to form a separation space 9 above the motor 2 so as to be separated from the secondary space 7 by the first oil separation body 5 and the second oil separation body 8. The gas passage 10 that connects the separation space 9 to the secondary space 7 is formed between the outer peripheral portion of the first oil separator 5 and the inner peripheral portion around the opening of the second oil separator 8.

[0007]

The lubricating oil mixed in the gas refrigerant passing through the air gap G is centrifugally separated by the centrifugal force generated by the rotation of the first oil separator 5, and the lubricating oil mixed in the gas refrigerant flowing through the core cut portion 21a is also lubricated. The oil is separated by colliding with the second oil separating body 8, and the separated lubricating oil is
The gas refrigerant from which the lubricating oil has been separated in the separation space 9 is returned to the bottom of the casing 1 from the core cut portion 21a and the air gap G, and the first oil separator 5 and the second oil separator. When passing through the gas passage 10 formed between the first and second oil separators 8 and the centrifugal force generated by the rotation of the first oil separator 5, the remaining lubricating oil in the gas refrigerant, which cannot be completely separated, is blown outward. Furthermore, the separated lubricating oil is returned to the bottom of the casing 1, and the gas refrigerant separated from the lubricating oil is separated into the first oil separator 5 and the second oil separator. It passes through the gas passage 10 formed by 8 and flows out to the secondary space 7. As a result, the lubricating oil mixed in the gas refrigerant,
After the oil is first separated in the separation space 9 formed by the first oil separator 5 and the second oil separator 8, it is separated even when passing through the gas passage 10, and this two-stage separation ensures the separation. The oil can be separated into the secondary space 7
Since the gas refrigerant having a small amount of lubricating oil mixed therein can be caused to flow out, it is possible to reduce the amount of lubricating oil flowing out of the casing 1 and to effectively prevent oil from rising.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A hermetic compressor according to the present invention will be described below with reference to the drawings. The hermetic compressor shown in FIG.
1 and an outer discharge pipe 12 are connected to each other, a motor including a stator 21 and a rotor 22 is provided above the inside of the closed casing 1.
The motor 2 is arranged, the compression element 3 is arranged below the motor 2, and the compression element 3 is rotationally driven by the drive shaft 23 extending from the rotor 22.

The motor 2 comprises a stator 21 integrally fixed to the casing 1 and a rotor 22 rotatably disposed inside the stator 21 via a predetermined air gap G. , The balance weight 2 is attached to the end rings 22a and 22b at the upper and lower ends of the rotor 22.
4 and 24 are attached, and a communication passage 4 is formed between a core cut portion 21a formed by cutting out an outer peripheral portion of the stator 21 and an inner peripheral surface 13 of the casing 1. Reference numeral 25 is a coil end of the stator 21.

Thus, the refrigerant gas sucked into the compression element 3 from the suction pipe 11 is compressed and discharged into the primary space 6 formed on the lower side of the motor 2. , The discharge gas is the air gap G of the motor 2.
And the communication passage 4 formed by the core cut portion 21a
After that, it is guided to a secondary space 7 formed on the upper side of the motor 2 and discharged from the secondary space 7 to the outside of the casing through the external discharge pipe 12.

In the embodiment shown in FIG. 1, in the above hermetic compressor, a disk-shaped first oil separation plate 5 is fixed to the upper part of the end ring 22a provided on the upper side of the rotor 22. At the same time, a second oil separator 8 having an opening 82 inward from the outer peripheral position of the first oil separator 5 is fixed to the inner peripheral surface 13 of the casing 1 above the motor 2, The second oil separation body 8 and the first oil separation plate 5 are arranged close to each other, and the secondary space 7 is provided above the motor 2 by the first oil separation body 5 and the second oil separation body 8. A separation space 9 for separating the first oil separation body 5 and the inner space around the opening of the second oil separation body 8 from the second space. The gas passage 10 communicating with 7 is formed.

That is, the first oil separator 5 is a disk-shaped member having a size that covers the entire upper surface of the rotor 22, and is fixed to the end ring 22a on the upper side. The oil separator 8 is the first oil separator 5 fixed to the rotor 22 from the inner peripheral surface 13 of the casing 1.
Opening 8 having a closed surface 81 extending inward from the outer peripheral position of the first oil separator 5 and having a diameter smaller than the outer diameter of the first oil separator 5.
2 is formed in a donut shape by being located in a central portion that is inward of the outer peripheral position of the first oil separation body 5, and the facing portion of the closed surface 81 with the first oil separation body 5 is 1 The oil separation body 5 side is dented, and the outer peripheral side end portion 81a of the closing surface 81 is bent downward so that the closing surface 81 is close to the coil end 25 and the first oil. This outer peripheral side end portion 81 is arranged so as to be close to the separation body 5.
The a is fixed to the inner peripheral surface 13 of the casing 1 by spot welding or the like.

The first oil separator 5 and the second oil separator 8 allow the stator 21 and the rotor 2 to be separated.
A separation space 9 is formed on the upper part of the second separation space 9 to separate it from the secondary space 7, and the upper surface of the first oil separation body 5 faces the first oil separation body 5 of the second oil separation body 8. Between the surface and the surface, the gas refrigerant separated in the separation space 9 is passed from the outer peripheral side of the first oil separation body 5 to the opening 82 of the second oil separation body 8, and the secondary space 7 is formed. Gas passage 10 to guide to
Is formed.

Thus, the first oil separator 5 described above is attached to the upper portion of the rotor 22 and the second oil separator 5 is attached to the upper portion of the rotor 22.
By providing the oil separator 8 above the motor 2,
Lubricating oil mixed in the gas refrigerant passing through the air gap G is separated by the centrifugal force of the first oil separator 5, and the separated lubricating oil is transmitted along the inner peripheral surface of the stator 21 to the casing 1 While returning to the bottom, this coil end 25
Is guided to the gas passage 10 formed between the first oil separation body 5 and the second oil separation body 8, the gas refrigerant from which the lubricating oil has been separated by the collision with the core cut portion. Lubricating oil mixed in the gas refrigerant flowing through the communication passage 4 formed by 21a is collided with the closing surface 81 of the second oil separating body 8 and separated, and the separated lubricating oil is separated by the core cutting portion 2
While returning to the bottom of the casing 1 along the outer peripheral surface of 1a, the gas refrigerant in which the lubricating oil is separated by the collision by the closing surface 81 is guided to the gas passage 10 along the closing surface 81, When the gas refrigerant guided in the gas passage 10 passes through the gas passage 10, since the first oil separator 5 is rotating, centrifugal force acts on the upper surface of the first oil separator 5, The lubricating oil remaining in the gas refrigerant that cannot be completely separated is blown outward by this centrifugal force and separated, and the separated lubricating oil is the same as the casing 1 as described above.
It can be returned to the bottom. The specific gravity of the gas refrigerant separated from the lubricating oil is lighter than that of the lubricating oil, and therefore the gas refrigerant flows out of the opening 82 into the secondary space 7 as it is.

As a result, the lubricating oil mixed in the gas refrigerant is
It can be first separated in the separation space 9 by collision with the closed surface 81 or centrifugation by the first oil separator 5.
Further, since the lubricating oil can be separated again when passing through the gas passage 10, the lubricating oil can be reliably separated by this two-step separation, and the gas refrigerant having a small amount of mixed lubricating oil is made to flow into the secondary space 7. Therefore, it is possible to reduce the outflow of the lubricating oil to the outside of the casing 1, and it is possible to effectively prevent the oil from rising.

The second oil separating body 8 has the closing surface 8
Although the central portion of 1 is deformed in a concave shape toward the first oil separator 5, the closing surface 81 may be formed in a flat and rough shape as shown in FIG. Further, although the outer peripheral end 81a of the closing surface 81 is bent, this bent portion is not always necessary.

[0017]

As described above, in the hermetic compressor of the present invention, the disk-shaped first oil separating body 5 is fixed to the upper portion of the rotor 22, and the casing 1 above the motor 2 is fixed. The second oil separator 8 having the opening 82 provided inward of the outer peripheral position of the first oil separator 5 is fixed to the inner peripheral surface 13 of the second oil separator 8 and the first oil separator 8. The separator 5 is arranged in close proximity to the motor 2, and the first
The oil separation body 5 and the second oil separation body 8 form a separation space 9 which is isolated from the secondary space 7, and the outer peripheral portion of the first oil separation body 5 and the opening portion of the second oil separation body 8 are formed. Since the gas passage 10 that connects the separation space 9 to the secondary space 7 is formed between the inner space and the surrounding inner peripheral portion, the air gap G is passed by the centrifugal force generated by the rotation of the first oil separator 5. The lubricating oil mixed in the gas refrigerant is centrifugally separated, and the lubricating oil mixed in the gas refrigerant flowing through the core cut portion 21a is separated by colliding with the second oil separator 8 to separate the separated lubricating oil. Oil can be returned from the core cut portion 21a and the air gap G to the bottom portion of the casing 1. Further, the gas refrigerant in which the lubricating oil is separated in the separation space 9 is used as the first oil separator 5. Before being formed between the second oil separator 8 When passing through the gas passage 10, the centrifugal force generated by the rotation of the first oil separator 5 allows the remaining lubricating oil in the gas refrigerant, which cannot be completely separated, to be blown outward and further centrifuged. The separated lubricating oil can be returned to the bottom of the casing 1 through the path, and the gas refrigerant separated from the lubricating oil can be the first refrigerant.
The gas passage 10 formed by the oil separator 5 and the second oil separator 8 can pass through and flow into the secondary space 7. As a result, the lubricating oil mixed in the gas refrigerant is first oil-separated in the separation space 9 formed by the first oil separator 5 and the second oil separator 8 and then when passing through the gas passage 10. Also, the oil can be surely separated by this two-step separation, and the gas refrigerant having a small amount of lubricating oil mixed therein can flow out to the secondary space 7. Therefore, the lubricating oil casing 1
Outflow to the outside can be reduced and oil spills can be effectively prevented.

[Brief description of drawings]

FIG. 1 is a partially omitted vertical sectional view showing an embodiment of a hermetic compressor of the present invention.

FIG. 2 is a partially omitted vertical sectional view showing another embodiment of the hermetic compressor of the present invention.

FIG. 3 is an explanatory diagram showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sealed casing 12 External discharge pipe 13 Inner peripheral surface of casing 2 Motor 21 Stator 21a Core cut part 22 Rotor 3 Compression element 5 1st oil separation body 7 Secondary space 8 2nd oil separation body 82 Opening 9 Separation space 10 Gas passage G air gap

Claims (1)

[Claims] 1. A motor 2 comprising a stator 21 having a core cut portion 21a, and a rotor 22 inserted into the stator 21 via an air gap G, above the inside of a hermetic casing 1, and a compression element 3 below. In the hermetic compressor in which the external discharge pipe 12 that opens to the secondary space 7 on the upper side of the motor 2 is provided in the upper part of the hermetic casing 1, a disk-shaped first compressor is provided above the rotor 22. A second oil separator that fixes the oil separator 5 and that has an opening 82 on the inner peripheral surface 13 of the casing 1 above the motor 2 inward from the outer peripheral position of the first oil separator 5. 8 is fixed, the second oil separation body 8 and the first oil separation body 5 are arranged in proximity to each other, and the first oil separation body 5 and the second oil separation body are arranged above the motor 2. Separation space 9 isolated from the secondary space 7 by 8 A gas passage 10 is formed between the outer peripheral portion of the first oil separator 5 and the inner peripheral portion of the second oil separator 8 around the opening, which communicates the separation space 9 with the secondary space 7. A hermetic compressor characterized by being formed.