JP2010121448A - Hermetic compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To remove the causes of degradation in energy conservation property caused by a sliding loss between components of a compression chamber, in a rotary hermetic compressor, in which an electric motor and a compression mechanism part connected with the electric motor are housed in a sealed vessel with an oil sump formed at the bottom, and gas compressed by the compression mechanism part is temporarily discharged in the sealed vessel to make pressure in the vessel high. <P>SOLUTION: The hermetic compressor has a depression 14 at the sidewall part of a vane 9. The vane 9 reciprocates by following a piston, and a sidewall abuts on an upper bearing and a lower bearing. Therefore, in the vane, a contact area is reduced by the depression 14 of the sidewall to reduce the sliding loss. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a rotary hermetic rotary compressor constituting a refrigeration cycle, and particularly to the shape of the vane.

In general, a compression chamber of a rotary type hermetic compressor is composed of a cylinder, a vane, an upper bearing, a lower bearing, and a piston, and these components come into contact with each other and slide during operation of the compressor. The sliding loss that occurred at this time was one of the major factors that reduced the efficiency of the compressor. For this reason, attempts have been made to reduce the sliding loss during operation by devising the processing method of the vane groove or the like (for example, see Patent Document 1).
JP-A-8-261185

  In the conventional method, a large number of facilities are required to change the processing method, and a large burden is imposed on the period and cost.

  The present invention has been made based on the above circumstances, and its object is to change the shape of the vane, solve the above-mentioned problems without impairing the function of the compressor, and achieve higher efficiency and reliability. It is intended to provide a hermetic compressor with a high level.

  In order to satisfy the above object, the hermetic compressor of the present invention uses a vane provided with a depression on the side wall.

  According to the present invention, the sliding loss at the vane side wall can be reduced, and the lubricity of the sliding surface is improved by the refrigerating machine oil staying in the depression, so that a compressor with excellent energy saving and reliability is provided. can do.

(Embodiment 1)
A cross-sectional view of the compressor according to the present invention is shown in FIG. A rotating shaft 3 is attached to an electric motor composed of a stator 1 and a rotor 2, and is connected to a lower compressor unit 4. The compression chamber includes a cylinder 5, an upper bearing 6, a lower bearing 7, a piston 8, and a vane 9, and the piston 8 inserted into the eccentric portion 10 of the rotating shaft 3 rotates to perform a compression motion. A cross section of the compression mechanism is shown in FIG. A vane 9 installed so as to be tangent to the piston 8 is inserted into a vane groove 11 provided in the cylinder, and reciprocates following the piston that rotates eccentrically with the rotational motion of the rotary shaft 3. As a result, the refrigerant gas flowing into the compression chamber from the suction hole 12 is compressed and discharged from the discharge hole 13.

The shape of the vane in this invention is shown in FIG. A recess 14 is provided in the side wall of the vane. Since the vane 9 reciprocates following the piston 8, the side wall contacts the upper bearing 6 and the lower bearing 7. In the vane, the contact area is reduced by the depression 14 on the side wall, and loss due to sliding can be reduced. This makes it possible to configure a compressor with excellent energy saving performance. Further, during the operation of the compressor, since the refrigerating machine oil stays in the depression 14, an oil film can be easily formed in the gap with the bearing end face. As a result, problems such as abnormal wear and seizure between the vanes 9 and the end surfaces of the upper bearing 6 and the lower bearing 7 can be eliminated, and a compressor with excellent reliability can be configured.
(Embodiment 2)
In recent years, a compressor using an HFC refrigerant not containing chlorine has been developed from the viewpoint of protecting the ozone layer. It is also possible to use a compressor having this mechanism for such an HFC refrigerant. (Embodiment 3)
In recent years, compressors using natural refrigerants such as carbon dioxide, helium, and ammonia have been developed from the viewpoint of preventing global warming. The present invention can also be applied to a compressor using such a natural refrigerant.
(Embodiment 4)
Normally, various types of oil are used in the compressor depending on the refrigerant used and the material used for the compression mechanism section 4. The present invention relates to natural products or oils derived from natural products such as naphthenic oil, paraffin oil and alkylbenzene oil, which are mainly used in compressors, and synthetic oils such as polyether oils and polyol ester oils, or the above natural oils. It is also possible to apply to mixed oils of oils derived from products or natural products and synthetic oils.

  As described above, the rotary hermetic compressor according to the present invention can reduce the sliding loss at the vane side wall, and the lubricity of the sliding surface is improved by the refrigerating machine oil staying in the recess. And since the compressor excellent in reliability can be provided, it can apply to heat pump application apparatuses, such as an air conditioning apparatus, a dehumidifier, and a dryer.

Vertical section of hermetic compressor Enlarged view of the compression chamber in the first embodiment The vane enlarged view in Embodiment 1.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Stator 2 Rotor 3 Rotating shaft 4 Compressor part 5 Cylinder 6 Upper bearing 7 Lower bearing 8 Piston 9 Vane 10 Eccentric part 11 Vane groove 12 Suction hole 13 Discharge hole 14 Recess of vane side wall part

Claims (4)

In a hermetic compressor having an electric motor and a compression mechanism in an airtight container having an oil reservoir at the bottom, the vane used in the compression mechanism has a shape in which a depression is provided on a side wall. Hermetic compressor. 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, and alkylbenzene oil, or oils derived from natural products, and synthetic oils such as polyether oils and polyol ester oils, or mixed oils of the above natural products or natural product-derived oils and synthetic oils The hermetic compressor according to claim 1, wherein