JP2014190219A - Hermetic compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve problems that iron loss in a rotator increases by as much as an increase in the area of a refrigerant passage at the sacrifice of efficiency since it is necessary to increase the area of the refrigerant passage provided in the rotator so as to reduce discharge of oil to a refrigeration cycle circuit outside of a hermetic compressor.SOLUTION: In a hermetic compressor including: an electric motor portion provided in a hermetic container 1, and constituted by a rotator 2 and a stator 3; a compression mechanism portion 4 provided in the hermetic container 1, and coupled to this electric motor portion; and an oil reservoir provided on a bottom of the hermetic container 1, 30% to 50% of a space of a lower coil end 5 is shielded with a shield member 6 provided on the stator 3, thereby accelerating collision of discharged gas and reducing the discharged oil from the compressor.

Description

  The present invention relates to a hermetic compressor provided in an outdoor unit or the like of an air conditioner.

  In general, a compressor used in an air conditioner, a refrigerator, or the like includes an electric motor unit including a rotor and a stator in a sealed container, a compression mechanism unit that is connected to the electric motor unit and compresses a refrigerant, And an oil reservoir for accumulating oil at the bottom. In such a compressor, if the refrigerant and the oil are not sufficiently separated in the sealed container, the refrigerant containing the oil flows out to the refrigeration cycle circuit outside the hermetic compressor, thereby reducing the cooling efficiency. In addition, there is a risk that the oil in the bottom portion in the sealed container is insufficient, and the operation in the compression mechanism portion cannot be performed smoothly.

  In general compressors, a refrigerant passage is provided in the rotor, and the refrigerant discharged from the compression mechanism flows from the lower space of the rotor to the upper space via the refrigerant passage and is discharged from the compressor. (See, for example, Patent Document 1).

JP-A-2005-351122

  However, in the conventional configuration, in order to reduce oil discharge to the refrigeration cycle circuit outside the hermetic compressor, it is necessary to increase the area of the refrigerant passage provided in the rotor. There is a problem that the iron loss of the rotor increases and the efficiency is sacrificed.

  The present invention solves the above-described conventional problems, and an object thereof is to reduce oil discharge of a hermetic compressor.

  In order to solve the above-described conventional problems, a hermetic compressor according to the present invention is provided in a stator, an electric motor unit including a rotor and a stator, a compression mechanism unit connected to the electric motor unit, and a stator. 30% to 50% of the lower coil end space is provided in the stator in the hermetic compressor including the lower coil end formed and a shield that shields the lower coil end space surrounded by the lower coil end. It is characterized by being shielded by a shielded body.

  As described above, according to the present invention, after the discharged refrigerant collides with the shield, the oil contained in the refrigerant is separated while colliding with the lower coil end or the like, so that the efficiency of the compressor is impaired. In addition, oil discharge can be reduced.

1 is a longitudinal sectional view of a hermetic compressor according to Embodiment 1 of the present invention. The enlarged view of the lower coil end space in Embodiment 1 of this invention The figure which shows the relationship between the shield / lower end coil space and oil discharge degree in Embodiment 1 of this invention

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a longitudinal sectional view of a hermetic compressor according to Embodiment 1 of the present invention.

  FIG. 2 is an enlarged view of the lower coil end space in the first embodiment of the present invention.

  In FIG. 1, a sealed container 1 has a plurality of electromagnetic steel plates, a motor part composed of a rotor 2 and a stator 3, a compression mechanism part 4 below, and an oil reservoir at the bottom of the sealed container 1. Department is provided.

  In FIG. 2, a lower coil end 5 is provided on the stator 3, and a shield 6 for shielding a lower coil end space surrounded by the lower coil end 5 is provided on the lower side of the rotor 2. It has been.

  The operation and action of the hermetic compressor configured as described above will be described below.

  The compressed refrigerant compressed in the compression chamber is discharged from the discharge hole provided in the lower bearing from the cylinder into the gap between the lower bearing and the lower valve cover, and then in the upper valve cover 7 through the communication hole provided in the cylinder. And is discharged from a hole provided in the upper valve cover 7 to a discharge chamber in the sealed container 1.

  By providing the shield 6 of the present embodiment, the refrigerant containing oil discharged from the upper valve cover 7 collides with the shield 6 immediately after discharge and diffuses to the surroundings, and then below the stator 3. While colliding with the coil end 5, it is discharged out of the hermetic container 1 through a gap provided in the stator 3. By repeating the collision of the discharge gas in this way, it is separated from the oil contained in the discharge gas, and the separated oil is not discharged outside the hermetic compressor, so oil discharge can be reduced. It becomes.

  FIG. 3 is a diagram showing the relationship between the shield / lower end coil space and the oil discharge degree in the first embodiment of the present invention.

  As shown in the test results, oil discharge can be reduced most efficiently by filling 30% to 50% of the lower coil end 5 space of the stator 3 with the shield 6.

  In the hermetic compressor of the present invention, HCFC or HFC that does not contain chlorine is used as a refrigerant, or a natural refrigerant such as carbon dioxide, ammonia, or helium.

  Furthermore, as oils, natural oils such as naphthenic oil, paraffin oil, alkylbenzene oil or oils derived from natural products, and synthetic oils such as polyether oils, polyol ester oils, or synthetic oils derived from natural products or natural products are synthesized. Oil blend oil can be used.

  Further, the oil includes a copper deactivator such as benzotriazole, a sulfur-based extreme pressure additive, a halogen-based extreme pressure additive, a phosphorus-based extreme pressure additive, an organometallic compound-based extreme pressure additive, and a combination thereof. You may mix | blend the extreme pressure additive which consists of.

  As described above, the hermetic compressor according to the present invention can be applied to an application using a heat pump because the discharge amount of refrigerating machine oil can be reduced.

DESCRIPTION OF SYMBOLS 1 Airtight container 2 Rotor 3 Stator 4 Compression mechanism part 5 Lower coil end 6 Shield 7 Upper valve cover

Claims (5)

An electric motor part composed of a rotor and a stator in a sealed container, a compression mechanism part connected to the electric motor part, a lower coil end provided in the stator, and a lower coil end space surrounded by the lower coil end A hermetic compressor provided with a shielding member, wherein 30% to 50% of the lower coil end space is shielded by a shield provided on the stator. The hermetic compressor according to claim 1, wherein HCFC, HFC or the like not containing chlorine is used as a refrigerant. The hermetic compressor according to claim 1, wherein a natural refrigerant such as carbon dioxide, ammonia, or helium is used as a refrigerant. Natural products such as naphthenic oil, paraffin oil, alkylbenzene oil or oils derived from natural products, and synthetic oils such as polyether oils and polyol ester oils, or mixed oils of the natural products or natural product-derived oils and synthetic oils The hermetic compressor according to claim 1, wherein: The oil comprises a copper deactivator such as benzotriazole, a sulfur-based extreme pressure additive, a halogen-based extreme pressure additive, a phosphorus-based extreme pressure additive, an organometallic compound-based extreme pressure additive, and combinations thereof. The hermetic compressor according to claim 1, wherein an extreme pressure additive is blended.