Fluid compressor

Abstract

A fluid compressor, a fluid compressor (1), comprising: a rotating shaft (300) having a compression mechanism (2) and an oil passage (311), an electric motor (600), bearings (401, 803), and an oil passage (311) Centrifugal pump section (900) for oil supply. The rotating shaft (300) has a main shaft part (302), a crank pin (301) eccentrically arranged on the main shaft part (302), and an auxiliary bearing support part (303) smaller in diameter than the main shaft part (302). The oil passage (311) has a first oil passage (311a) extending from the lower end of the auxiliary bearing support part (303) to the lower part of the main shaft part (302), and communicates with the first oil passage (311a) and extends to the crank The second oil passage (311b) at the upper end of the pin (301). The second oil passage (311b) has a diameter smaller than that of the first oil passage (311a), has an outer passage portion, and is formed in plural within the plane range of the crank pin (301).

Description

technical field [0001] The present invention relates to a fluid compressor including a rotating shaft with an oil passage, in particular to a refrigerant compressor for refrigeration, air conditioning, air or other fluid compressors. Background technique [0002] A conventional fluid compressor is shown in JP-A-2001-349291. of JP-A-2001-349291 figure 1 The screw compressor above has in its airtight container: a compression mechanism part for compressing fluid, a rotating shaft connected to the compression mechanism part and having an oil passage, a motor driving the rotating shaft, and a main shaft supporting the rotating shaft above the motor. Bearings, sub-bearings that support the rotating shaft under the motor, and positive displacement pumps that supply oil stored in the bottom of the airtight container to the compression mechanism and bearings through the oil passage. [0003] And, the rotating shaft has, as a whole, a main shaft part fixed on the motor rotor, a cran...

AI Technical Summary

Problems solved by technology

However, there is a problem that the price of the positive displacement pump part is generally higher than that of the centrifugal pump part

[0008] The screw compressor shown in Japanese Unexamined Patent Publication No. 2-245492 has an inexpensive structure because a centrifugal pump unit is used, but the second oil passage is connected within the plane of the first oil passage, and there is only one second oil passage , thus having the problem of ensuring adequate oil supply

In addition, since the viscosity of the oil decreases when the oil temperature rises, the centrifugal effect acting on the inner wall is reduced in the centrifugal pump part, and there is a problem that the necessary oil supply cannot be ensured.

Images