Hermetic compressor

Inactive Publication Date: 2006-11-16
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0013] In order to solve the above-mentioned problems with a prior art, a hermetic compressor of the present invention includes an under cut that does not communicate with at least a top surface of a piston on an outer circumferential surface of the piston excluding a sliding surface provided in the axis direction and in the perpendicular direction of the piston pin, in which the under cut communicates with space inside a housing at least in the vicinity of the bottom dead center. This configuration makes it possible to reduce sliding loss due to the reduction in a sliding area. Furthermore, by the sliding surface provided in the parallel and in the perpendicular direction of the piston pin, the inclination of the piston with respect to the cylinder is suppressed, thus suppressing the leakage of refrigerant. Furthermore, by supplying the sliding portion with oil through the under cut, the sealing property can be improved. With the above mentioned effect, a hermetic compressor with high efficiency can be provided.

Problems solved by technology

As a result, there has been a problem that leakage of refrigerant increases, and the refrigerating capacity is deteriorated so as to lower the efficiency.

Method used

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Embodiment Construction

[0022] Hereinafter, an exemplary embodiment of the present invention is described with reference to drawings. Note here that the present invention is not limited by the exemplary embodiment.

Exemplary Embodiment

[0023]FIG. 1 is a longitudinal sectional view showing a hermetic compressor in an exemplary embodiment of the present invention; FIG. 2 is an enlarged sectional view showing an element around a piston; FIG. 3 is a front view showing a piston; FIG. 4 is a sectional view of a part along line 4-4 of FIG. 3; FIG. 5 is an enlarged sectional view showing an end face of an under cut of a piston; and FIG. 6 is an enlarged sectional view showing a tip of a piston.

[0024] As shown in FIGS. 1 to 6, housing 101 houses motor element 104 and compression mechanism 105 driven by motor element 104, and moreover contains oil 106. Motor element 104 includes stator 102 and rotor 103, and enables inverter driving by using a control circuit, etc. controlled at plural operational frequencies inclu...

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Abstract

A hermetic compressor including a housing containing oil and a compression mechanism for compressing a refrigerant gas. In this configuration, a cylindrical piston has under cuts which do not communicate with at least a top surface at a cylinder side of the piston and are formed on an outer circumferential surface of the piston excluding a sliding surface existing in the axial direction of a piston pin and the perpendicular direction of the piston pin viewed from the axial direction of the piston, in which the under cuts communicate with space inside the housing in the vicinity of the bottom dead center. Since the sliding surface is provided in the direction parallel to and perpendicular to the axis, inclination of the piston in the vertical direction is suppressed and at the same time oil supply to the sliding portion through the under cuts is promoted. Therefore, the sealing property and lubricant property are improved, and thus high efficiency of the compressor can be realized.

Description

TECHNICAL FIELD [0001] The present invention relates to a hermetic compressor used in a refrigerating cycle of a Refrigerator Freezer, etc. BACKGROUND ART [0002] Recently, reduction in power consumption of this kind of hermetic compressors has been strongly demanded. In a hermetic compressor disclosed in International Publication WO 02 / 02944, by improving an outer shape of a piston, sliding loss between the piston and a cylinder is reduced so as to achieve efficiency. [0003] Hereinafter, a conventional hermetic compressor is described with reference to drawings. [0004]FIG. 7 is a longitudinal sectional view showing a general hermetic compressor described in US Pat. No. 5,228,843; and FIG. 8 is a perspective view showing a piston described in International Publication WO 02 / 02944. [0005] As shown in FIG. 7, hermetic housing 1 houses motor element 4 consisting of stator 2 having winding portion 2a and rotor 3, and compression element 5 driven by motor element 4. Moreover, in the lower...

Claims

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Application Information

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IPC IPC(8): F04B35/04F04B39/00F04B39/02
CPCF04B39/023F04B39/0005F04B39/0094F04B39/122F04B39/0022F25B31/02F05B2210/14Y10S417/902
InventorUMEOKA, IKUTOMOKATAYAMA, MAKOTOYABIKI, JUNICHIRO
OwnerPANASONIC CORP