JP2020133523A - Hermetic type compressor - Google Patents

Abstract

To provide a lateral discharge system hermetic type compressor which is small, short and which has high performance.SOLUTION: A discharge pipe 12 of a sealed container 4 in which an electric motor part 7 and a compression mechanism part 8 are stored is located between a groove 13 provided on a stator outer periphery of the electric motor part and an air gap 14 between a stator 5 and a rotor 6, and is opened. With this constitution, even when an upper space 15 above the stator of the electric machine part is narrowed down, an oil in a refrigerant moving up in the groove 13 provided on the stator outer periphery of the electric motor part and the air gap 14 between the stator and the rotor hardly flows into the discharge pipe, and the amount of oil discharged to the outside can be reduced.SELECTED DRAWING: Figure 2

Description

The present invention relates to a closed compressor used in a freezing device such as an air conditioner or a refrigerator.

Generally, a closed compressor houses an electric motor unit composed of a stator and a rotor and a compression mechanism unit connected to the electric motor unit in a closed container in which an upper shell, a body shell, and a lower shell are integrated by welding. It is configured. Then, the refrigerant gas is compressed by a compression mechanism unit, for example, a rotary type compression mechanism unit composed of a cylinder, an upper bearing, a lower bearing, a shaft, a piston, etc., and discharged into a closed container through a valve cover. The refrigerant gas discharged into the closed container is discharged to the outside from a discharge pipe connected to the upper shell of the closed container (see, for example, Patent Document 1).

FIG. 5 is a closed compressor described in Patent Document 1, in which 100 is a closed container, 101 is an electric motor unit provided in the closed container 100, 102 is a compression mechanism unit driven by the electric motor unit 101, and 103 is a compression mechanism unit 102. It is a discharge pipe that discharges the refrigerant gas compressed in (1) to the outside.

In the sealed compressor having the above configuration, the refrigerant gas compressed by the compression mechanism unit 102 passes through the groove 105 provided on the outer periphery of the stator 104 of the motor unit 101 and the air gap 107 between the stator 104 and the rotor 106. It reaches the space above 101 and is discharged from the discharge pipe 103.

The discharge pipe 103 generally has a shape that protrudes upward, but depending on the configuration of the refrigerating equipment equipped with the compressor, a closed type compressor in which the discharge pipe 103 protrudes sideways is required. There is.

FIG. 6 shows a closed compressor in the case of such a horizontal discharge pipe. The discharge pipe 103 is connected sideways to the upper shell 100a of the closed container 100, and the refrigerant gas is discharged sideways.

Japanese Unexamined Patent Publication No. 2011-241778

In the above-mentioned conventional closed-type compressor, the size and height of the compressor itself are being reduced for the purpose of saving space and reducing the size and weight of the refrigerating equipment in which the compressor is installed. There is a problem that the upper space 108 above the electric motor unit 101 is reduced and the amount of oil in the refrigerant gas discharged through the space 108 is increased.

That is, a part of the oil that lubricates the compression mechanism 102 is mixed in the refrigerant gas that is compressed by the compression mechanism 102 and discharged into the closed container 100 in the form of mist, and the mist-like oil is the discharge pipe 103. Is diffused in the space 108 above the electric motor unit 101 to which the above is connected, adheres to the upper coil end 109 of the electric motor unit 101, the inner peripheral wall surface of the space 108, etc. and separated, but when the space becomes narrow, the refrigerant adheres to the space 108. As the area of the inner peripheral wall surface is reduced, the amount of oil to be separated is reduced, and the proportion of oil discharged from the discharge pipe 103 is increased accordingly, so that the amount of oil discharged to the outside is increased.

Then, if the oil in the compressed refrigerant gas as described above is discharged from the discharge pipe 103 to the outside of the closed container without being separated, that is, if the amount of oil discharged increases, the performance of the refrigerating equipment deteriorates.

In particular, in the horizontal discharge type closed compressor in which the discharge pipe 103 is connected sideways to the closed container 100, the inner allowance of the discharge pipe 103 connected to the closed container 100 to the inside of the container is short, so that the electric motor unit 101 The refrigerant rising from the groove 105 provided in the stator 104 directly flows into the opening of the discharge pipe 103 while containing the oil mist, and the amount of oil discharged to the outside tends to increase. Therefore, some measures are required when the space 108 above the stator 104 of the electric motor unit 101 is narrowed to reduce the size and height.

The present invention has been made in view of these points, and is a compact, low-profile, high-performance sealed compressor with a small amount of oil discharged to the outside even if the space above the electric motor is narrowed. It is intended to be provided.

In order to achieve the above object, the present invention is provided with a discharge pipe connected laterally to the upper space of the closed container, and the discharge pipe is provided between a groove having an inner end of the closed container on the outer periphery of the stator of the electric motor portion and the stator and the rotor. It is configured to be positioned and opened between the air gap and the air gap.

As a result, the oil in the refrigerant that rises the air gap between the groove provided on the outer periphery of the stator of the motor portion and the stator and the rotor is less likely to flow into the discharge pipe, and the upper space above the stator of the motor portion is narrowed. However, the amount of oil discharged to the outside can be reduced.

According to the above configuration, the present invention can be a high-performance closed-type compressor with a small oil discharge amount while being compact and low in height, even if it is a horizontal discharge type closed-type compressor.

External view of the sealed compressor according to the first embodiment of the present invention. Cross-sectional view of the sealed compressor Sectional sectional view of the main part of the closed type compressor according to Embodiment 1 of this invention. Top view of the closed compressor according to the first embodiment of the present invention. Sectional view of a conventional sealed compressor Sectional view of other conventional sealed compressors

The first invention is in a closed container having an oil storage portion at the bottom, an electric motor portion provided in the closed container, a compression mechanism portion arranged above the electric motor portion, and an upper space above the electric motor portion. The electric motor portion is provided with a discharge pipe provided, and the motor portion is composed of a stator and a rotor, and the refrigerant compressed by the compression mechanism portion provides a groove provided on the outer periphery of the stator of the motor portion and an air gap between the stator and the rotor. A closed compressor that moves to the upper space above the electric motor unit and then discharges from the discharge pipe. The discharge pipe is connected sideways to the upper space of the closed container, and the inner end of the closed container is the electric motor. The structure is such that the groove provided on the outer periphery of the stator of the portion and the air gap between the stator and the rotor are located and opened.

As a result, the oil in the refrigerant that rises between the groove provided on the outer periphery of the stator of the electric motor and the air gap between the stator and the rotor is less likely to flow into the discharge pipe, and the upper space above the stator of the motor is narrowed. However, the amount of oil discharged to the outside can be reduced.

In the second invention, in the first invention, the inner end of the closed container of the discharge pipe is configured such that the upper portion is cut and the upper surface side thereof is opened.

As a result, it is possible to more reliably reduce the inflow of oil in the refrigerant gas that rises between the groove provided on the outer periphery of the stator of the electric motor portion and the air gap between the stator and the rotor into the discharge pipe, and to the outside. The oil discharge amount can be further reduced.

A third invention is the first or second invention in which the discharge pipe is connected in a tangential direction in the rotation direction of the electric motor portion.

As a result, the inflow of oil into the refrigerant gas into the discharge / discharge pipe can be further reduced, and the amount of oil discharged to the outside can be further reduced.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention is not limited to this embodiment. Further, in each figure, the same reference numerals are used for the same components, and the description thereof will be omitted.

(Embodiment 1)
FIG. 1 is an external view of the closed-type compressor according to the first embodiment of the present invention, and FIG. 2 is a cross-sectional view of the closed-type compressor.

In the closed compressor according to the present invention, the upper shell 1, the body shell 2, and the lower shell 3 are integrated by welding into a closed container 4, which is compressed with an electric motor unit 7 composed of a stator 5 and a rotor 6. The mechanism unit 8 is housed and configured. The bottom of the closed container 4 is an oil storage portion 4a, and oil for lubricating the sliding portion of the compression mechanism portion 8 is stored.

The compression mechanism portion 8 is composed of an upper bearing 9, a cylinder 10, a lower bearing 11, and the like, and a discharge pipe 12 is connected to the upper shell 1 in the lateral direction. Further, a plurality of grooves 13 are formed on the outer periphery of the stator 5 of the electric motor unit 7, and an air gap 14 is formed between the stator 5 and the rotor 6, and these are the upper space 15 and the lower space 16 of the electric motor unit 7. Is connected.

The discharge pipe 12 is connected to the upper space 15 and is opened by positioning the inner end of the container between the groove 13 provided on the outer periphery of the stator of the electric motor portion 7 and the air gap 14 between the stator 5 and the rotor 6. I'm letting you.

Next, the action and effect of the closed compressor configured as described above will be described.

The refrigerant gas sucked through the accumulator 17 is compressed by the cylinder 10 of the compression mechanism unit 8 and discharged from the upper bearing 9 portion to the lower space 16 below the electric motor portion 7 of the closed container 4. The refrigerant gas discharged into the lower space of the electric motor unit 7 is oil generated by scooping up the oil mist after lubricating the sliding portion of the electric motor unit 7 and the oil accumulated in the oil storage unit 4a below the electric motor unit 7. The groove 13 and the air gap 14 of the electric motor unit 7 are raised in a state of containing the mist, reach the upper space 15 above the electric motor unit 7, and are discharged from the discharge pipe 12.

Here, the discharge pipe 12 is opened so that the inner end of the closed container is located between the groove 13 provided on the outer periphery of the stator of the electric motor portion and the air gap 14 between the stator 5 and the rotor 6. The oil in the refrigerant rising in the groove 13 provided on the outer periphery of the stator of the electric motor portion 7 is less likely to flow into the discharge pipe 12. Further, the oil in the refrigerant that rises in the air gap 14 between the stator 5 and the rotor 6 is less likely to flow into the discharge pipe 12. Therefore, even if the upper space 15 above the stator of the electric motor unit 7 is narrowed, the amount of oil discharged to the outside can be reduced.
(Embodiment 2)
FIG. 3 is a cross-sectional view of a main part of the sealed compressor according to the second embodiment of the present invention.

In the second embodiment, the inner end of the closed container of the discharge pipe 12 is configured such that the upper portion is cut 18 and the upper surface side thereof is an opening.

Other configurations are the same as those in the first embodiment, and the description thereof will be omitted.

According to the present embodiment, the oil in the refrigerant rising through the groove 13 provided on the outer periphery of the stator of the electric motor unit 7 and the air gap 14 between the stator 5 and the rotor 6 flows into the discharge pipe 12. Can be further reduced, and the amount of oil discharged to the outside can be further reduced.

(Embodiment 3)
FIG. 4 is a plan view of the closed compressor according to the third embodiment of the present invention.

In the third embodiment, the discharge pipe 12 is connected in the tangential direction of the rotation direction of the electric motor unit 7.

Other configurations are the same as those of the first or second embodiment, and the description thereof will be omitted.

As a result, the inflow of oil into the refrigerant gas into the discharge pipe 12 can be reduced more effectively, and the amount of oil discharged to the outside can be further reduced.

More specifically, the refrigerant rising in the upper space 15 above the electric motor unit 7 becomes a swirling flow a with the rotation of the rotor 5 of the electric motor unit 7, that is, the rotation of the coil end 5a of the rotor 5, but the discharge pipe. 12 is located in the upper space 15 along the direction of the swirling flow a. Therefore, the oil mist mixed in the refrigerant gas flows in the direction away from the opening of the discharge pipe 12 due to its inertial force, and it becomes difficult for the oil mist to flow into the discharge pipe 12.

Therefore, the inflow of oil in the refrigerant into the discharge pipe 12 can be reduced more effectively, and the amount of oil discharged to the outside can be further reduced. In particular, the larger the particle size of the oil mist, the larger the inertial force and the more difficult it is to flow into the discharge pipe 12, so that the oil discharge amount can be effectively reduced.

Further, since the refrigerant rising in the upper space 15 above the electric motor portion 7 is swirling, the oil mist density tends to be higher as it is closer to the inner peripheral wall of the closed container. Therefore, in the present embodiment and the configurations of each of the above-described embodiments, the opening of the discharge pipe 12 is located between the groove 13 provided on the outer periphery of the stator of the electric motor portion 7 and the air gap 14 between the stator 5 and the rotor 6. According to this, the refrigerant gas having a higher oil mist density near the inner peripheral wall of the closed container is less likely to flow into the discharge pipe 12, and from this point as well, the amount of oil discharged to the outside can be further reduced.

Although the low-pressure sealed compressor according to the present invention has been described above using the above-described embodiment, the present invention is not limited thereto. That is, it should be considered that the embodiments disclosed this time are exemplary in all respects and not restrictive, and the scope of the present invention is indicated by the claims rather than the above description. It is intended to include all changes within the meaning and scope of the claims.

As described above, the present invention can be a high-performance closed-type compressor with a small amount of oil discharge while being compact and low in height, even if it is a horizontal discharge type closed-type compressor. Therefore, it can be widely used as a closed compressor for various refrigeration equipment that requires small size and low profile.

1 Upper shell 2 Body shell 3 Lower shell 4 Sealed container 4a Oil storage part 5 Stator 5a Coil end 6 Rotor 7 Electric motor part 8 Compression mechanism part 9 Upper bearing 10 Cylinder 11 Lower bearing 12 Discharge pipe 13 Groove 14 Air gap 15 Upper space 16 Upper Space 17 Accumulator 18 Cut

Claims (3)

A closed container having an oil storage portion at the bottom, an electric motor portion provided in the closed container, a compression mechanism portion arranged above the electric motor portion, and a discharge pipe provided in an upper space above the electric motor portion. The electric motor unit is composed of a stator and a rotor, and the refrigerant compressed by the compression mechanism unit is above the electric motor unit through a groove provided on the outer periphery of the stator of the electric motor unit and an air gap between the stator and the rotor. It is a closed type compressor that discharges from the discharge pipe after reaching the upper space of the above, and the discharge pipe is connected sideways to the upper space of the closed container, and the inner end of the closed container is connected to the outer periphery of the stator of the electric motor portion. A closed compressor that is located and opened between the provided groove and the air gap between the stator and rotor. The closed compressor according to claim 1, wherein the inner end of the closed container of the discharge pipe is cut at the upper part and the upper surface side is opened. The sealed compressor according to claim 1 or 2, wherein the discharge pipe is connected in the tangential direction of the rotation direction of the electric motor unit.

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