JP2012225205A - Hermetic compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve such a problem that a sufficient amount of oil can not be supplied from an oil hole at the small shaft side of a crankshaft due to a small space for oil ejection.SOLUTION: A hermetic compressor has an electric motor 3 in a sealed container 1, a crankshaft 6 driven by the electric motor 3, a roller 7 driven by the crankshaft 6, a cylinder 8 for storing the roller 7, and a main end plate 10 and supplementary end plate 11 in which both ends surface of the cylinder 8 are fastened by a plurality of bolts while combining a bearing for holding the crankshaft 6. In the crankshaft 6, an oil discharge space 13 is provided at a portion which is brought into contact with the supplementary end plate 11.

Description

  The present invention relates to a hermetic compressor used in an air conditioner or a refrigerator.

  A conventional rotary type compressor is shown in FIG. An electric motor 110 that drives the compression mechanism 102 is fixed inside the sealed container 101, and a crankshaft 103 that drives the compression mechanism 102 is coupled to the electric motor 110. The compression mechanism 102 includes a roller 104 driven by a crankshaft 103, a cylinder 105 that is a cylindrical cylinder that houses the roller 104, a partition plate that abuts the roller 104 and partitions the inside of the cylinder 105, and both end surfaces of the cylinder 105. It is comprised by the end plate to hold | maintain. The end plate includes a main end plate 107 and an auxiliary end plate 108. The end plate is disposed so as to hold the crankshaft 103 and also serve as a bearing so as to sandwich a compression mechanism. It is fixed by welding. A discharge hole 109 is provided in the auxiliary end plate 108 and the compressed refrigerant gas is discharged into the sealed container 101 (see, for example, Patent Document 1).

JP 2002-98075 A

In the above conventional configuration, oil for lubricating the small shaft of the crankshaft and the bearing of the auxiliary end plate is supplied from an oil hole provided on the small shaft side of the crankshaft. However, there is a problem that the space in which oil discharged from the hole is discharged is small and sufficient oil cannot be supplied.
Although an example in which a space is provided on the auxiliary end plate side in order to increase the space volume can be seen, a sufficient cross-sectional area has not been secured. In addition, since this auxiliary end plate receives the weight of the crankshaft and the rotor, increasing its diameter to increase the space volume on the auxiliary end plate side will increase wear and noise due to reduction of the sliding area. It will be connected.
The present invention solves the above-described conventional problems, and an object thereof is to provide a hermetic compressor having sufficient reliability by supplying sufficient oil to a small shaft side bearing of a crankshaft.

  In order to solve the above problems, a hermetic compressor of the present invention houses an electric motor, a crankshaft driven by the electric motor, a roller driven by the crankshaft, and the roller in a hermetic container. A hermetic compressor having a cylinder, a main end plate serving as a bearing for holding the crankshaft and both ends of the cylinder being fastened by a plurality of bolts, and an auxiliary endplate, An oil discharge space is provided in a portion in contact with the auxiliary end plate.

  Thereby, since the space into which oil flows in increases, sufficient oil can be supplied to the small shaft side bearing of the crankshaft. This effect is prominent in alternative refrigerants and natural refrigerants with high condensation pressure and high refrigerant density.

According to the hermetic compressor of the present invention, sufficient oil is supplied to the small shaft side bearing of the crankshaft,
A hermetic compressor having high reliability can be provided.

Sectional view of hermetic compressor according to Embodiment 1 Sectional drawing which shows the principal part of the hermetic compressor which concerns on Embodiment 1. FIG. Vertical section of a conventional hermetic compressor

  The hermetic compressor of the present invention includes an electric motor in a hermetic container, a crankshaft driven by the electric motor, a roller driven by the crankshaft, a cylinder that houses the roller, and both end faces of the cylinder Is a hermetic compressor having a main end plate that also serves as a bearing for holding the crankshaft and an auxiliary end plate, and the crankshaft is in contact with the auxiliary end plate Is provided with an oil discharge space.

  In some embodiments, the refrigerant gas is an alternative refrigerant that does not contain chlorine.

  In certain embodiments, the refrigerant gas is a natural refrigerant.

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

(Embodiment 1)
FIG. 1 is a cross-sectional view of a hermetic compressor in the present embodiment. FIG. 2 is a cross-sectional view showing a main part of the hermetic compressor in the present embodiment.
In the hermetic compressor in the present embodiment, the stator 4 of the electric motor 3 that drives the compression mechanism 2 is fixed inside the hermetic container 1, and the crankshaft 6 that drives the compression mechanism 2 to the rotor 5 of the electric motor 3. Are combined.
The compression mechanism 2 includes a roller 7 driven by a crankshaft 6, a cylinder 8 that is a cylindrical cylinder, a partition plate that abuts against the roller 7 and partitions the inside of the cylinder 8, and end plates that hold both end faces of the cylinder 8. It is configured.
Here, the end plate is disposed so as to be sandwiched from above and below by the main end plate 10 also serving as a bearing for holding the crankshaft 6 and the auxiliary end plate 11, and is fixed to the sealed container 1 by welding on the outer periphery of the main end plate 10. Yes. An oil reservoir 11 a may be provided on the end face of the auxiliary end plate 11.
Here, an oil supply hole 12 is provided on the small shaft 6a side of the crankshaft, and oil is supplied to the sliding surface with the auxiliary end plate 11, but the oil discharged from the oil supply hole 12 is supplied. An oil discharge space 13 is provided in the crankshaft 6 for the purpose of increasing the space volume. Thereby, sufficient oil can be supplied to the small shaft side of the crankshaft, and a hermetic compressor having high reliability can be provided.

  As described above, the hermetic compressor according to the present invention can be used as a high-efficiency compressor, and can be used as an alternative refrigerant for all HCFC22, such as R407C, regardless of R410A. It can also be applied to natural refrigerants such as carbon dioxide, ammonia, and helium that are attracting attention from the viewpoint of environmental protection.

DESCRIPTION OF SYMBOLS 1 Airtight container 2 Compression mechanism 3 Electric motor 4 Stator 5 Rotor 6 Crankshaft 6a Small shaft 7 of a crankshaft Roller 8 Cylinder 10 Main end plate 11 Auxiliary end plate 11a Oil pool 12 Oil supply hole 13 Oil discharge space

Claims (3)

An electric motor, a crankshaft driven by the electric motor, a roller driven by the crankshaft, a cylinder for storing the roller, and both ends of the cylinder are fastened by a plurality of bolts in an airtight container. And a hermetic compressor having a main end plate also serving as a bearing for holding the crankshaft and an auxiliary end plate,
A hermetic compressor in which an oil discharge space is provided in a portion where the crankshaft contacts the auxiliary end plate. The hermetic compressor according to claim 1, wherein the refrigerant gas is an alternative refrigerant not containing chlorine. The hermetic compressor according to claim 1, wherein the refrigerant gas is a natural refrigerant.

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