Rotary Hermetic Compressor

Abstract

The present invention provides a rotary hermetic compressor (100) capable of achieving high output while maintaining reliability. The rotary sealed compressor (100) houses an electric motor (2) and a compression mechanism (3) in a sealed container (1). The compression mechanism (3) is connected to the electric motor (3) through a crankshaft (4) under the electric motor (2). 2) Connection, the compression mechanism (3) is equipped with a crankshaft (4), and the crankshaft (4) is equipped with a main shaft (4a), a countershaft (4b), and an eccentric shaft (4c) fixed to the electric motor (2). When the length of the shaft (4b) is L and the length of the eccentric shaft (4c) is l, l / L is 0.75 or less.

Description

technical field [0001] The present invention relates to a rotary hermetic compressor for compressing refrigerant gas used in a refrigeration cycle system. Background technique [0002] To fit the piston to the eccentric shaft when assembling the compressor, the value obtained by subtracting the eccentricity of the eccentric shaft relative to the center of the main or sub shaft from the radius of the eccentric shaft needs to be greater than or equal to the radius of the main or sub shaft. Assuming that the value obtained by subtracting the amount of eccentricity from the radius of the eccentric shaft is smaller than the radius of the main or auxiliary shaft, if the piston is to be inserted into the eccentric shaft through the main or auxiliary shaft, the outer diameter of the eccentric shaft and the piston The inner diameter of the inner diameter will interfere and make it impossible to insert. [0003] To increase the discharge volume in order to increase the capacity of th...

AI Technical Summary

Problems solved by technology

[0007] However, the hermetic compressor described in Patent Document 1 has the following problems: the possibility of sintering of the bearing part increases due to the reduction in the diameter of the sub-shaft, and the problem of enlarging the discharge volume, that is, increasing the length of the eccentric shaft prone to deflection

If the length of the eccentric shaft is increased to increase the discharge volume, the eccentric shaft subjected to the gas load of the compression chamber will be slightly deflected, but there is a problem that if the eccentric shaft is greatly deflected, the The shaft will incline in the auxiliary bearing, so that the thickness of the oil film in the bearing will become smaller, and the lubrication condition of the bearing part will deteriorate, which will cause the shaft and bearing to sinter during the operation of the compressor, which may cause the operation of the compressor to stop. can't start anymore

To solve the above problems, the technology described in Patent Document 1 does not take into account the relationship between the length of the sub-bearing and the length of the eccentric shaft.

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