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Sealed compressor

Inactive Publication Date: 2011-07-21
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0013]In view of the conventional problems, it is an object of the present invention to provide a hermetic compressor in which the piston is reversed in its inclination direction with respect to the axial center of the cylindrical hole in the initial stage of the compression stroke. This reduces the contact between the piston and the tapered portion at the time of the reversal and reduces the noise, as compared with the case in which the piston is reversed in its inclination direction in the middle or later stage of the compression stroke.
[0015]This structure reduces the sliding resistance, that is, the sliding loss between the piston and the cylindrical hole. This structure also reduces the load when the region of the outer surface of the piston, which did not slide with the tapered portion at the time of the reversal, comes into contact with the tapered portion. The load reduction can be achieved because in the initial stage of the compression stroke, the end face on the compression space side of the piston is subjected to only a small compressive load. This reduces the contact between the piston and the tapered portion, as compared with the case in which the piston is reversed in its inclination direction in the middle or later stage of the compression stroke. This results in a reduction in the contact when the piston is reversed in its inclination direction with respect to the axial center of the cylindrical hole, thereby achieving noise reduction.

Problems solved by technology

This structure reduces the sliding resistance, that is, the sliding loss between the piston and the cylindrical hole.

Method used

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first exemplary embodiment

[0034]FIG. 1 is a longitudinal sectional view of a hermetic compressor according to a first exemplary embodiment of the present invention. FIG. 2 is a longitudinal sectional view of an essential part of a compression section of the hermetic compressor. FIG. 3 is a longitudinal sectional view of the essential part of the compression section including its design dimensions. FIG. 4 is a cross sectional view of the essential part of the compression section including its design dimensions.

[0035]In FIGS. 1 to 4, the hermetic compressor includes airtight container 103 having electric element 105 and compression element 107 driven by electric element 105. Electric element 105 includes stator 105a and rotor 105b. Airtight container 103 has lubricating oil 101 at its bottom. Compression element 107 includes shaft 113 having main shaft portion 109 and eccentric shaft portion 111, which is eccentric thereto to move in unison therewith. Main shaft portion 109 is fixed to the axial center of roto...

second exemplary embodiment

[0095]A present exemplary embodiment has the same structure as the first exemplary embodiment except that bearing 119 and compression space 115 are arranged differently. Therefore, the following description of the present exemplary embodiment will be mainly focused on the difference.

[0096]FIG. 10 is a longitudinal sectional view of an essential part of a compression section, including its design dimensions, of a hermetic compressor according to the present exemplary embodiment. FIG. 11 is a cross sectional view of the essential part of the compression section, including its design dimensions, of the hermetic compressor.

[0097]As shown in FIGS. 10 and 11, in the present exemplary embodiment, bearing 119 and compression space 115 are arranged in such a manner that third center line 142 and second center line 143 cross each other. Third center line 142 is parallel with first center line 141 representing the axial center of bearing 119. Second center line 143 represents the axial center ...

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Abstract

A hermetic compressor includes a cylindrical hole (117) forming a compression space (115) and having a tapered portion (127) so as to increase its inner diameter from the top dead center to the bottom dead center of a piston (123). The piston (123) is reversed in its inclination direction with respect to the axial center of the cylindrical hole (117) in the initial stage of the compression stroke. This reduces the contact between the piston (123) and the cylindrical hole (117) at the time of the reversal, as compared with the case in which the piston (123) is reversed in its inclination direction in the middle or later stage of the compression stroke. As a result, the hermetic compressor is reliable and has low noise level.

Description

TECHNICAL FIELD[0001]The present invention relates to a hermetic compressor used in a refrigeration cycle of a fridge-freezer or the like.BACKGROUND ART[0002]One conventional hermetic compressor having a reciprocating compression mechanism is disclosed on Patent Literature 1. The hermetic compressor of Patent Literature 1 includes a cylinder, a piston, and a connecting rod. The cylinder has a cylindrical compression space on the inner-diameter side. The piston is cylindrical on the outer-diameter side and reciprocates in the cylinder. The connecting rod connects the piston to an eccentric shaft portion of a shaft via a piston pin. The compression mechanism is driven by the rotation of a rotor of a motor with the shaft fixed to the axial center of the rotor.[0003]In such hermetic compressors, it is generally necessary to provide a gap for allowing the inner-diameter side of the cylinder and the outer-diameter side of the reciprocation piston to slide with each other. When the gap is ...

Claims

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Application Information

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IPC IPC(8): F04B39/12
CPCF04B39/023F04B39/126F04B39/125
Inventor YAGI, AKIOMORITA, ICHIRO
Owner PANASONIC CORP
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