Refrigerant compressor with supporting bearing insulation

Patent metadata

Field	Value
Publication number	US-10584744-B2
Application number	US-201715624772-A
Country	US
Kind code	B2
Filing date	Jun 16, 2017
Priority date	Sep 5, 2016
Publication date	Mar 10, 2020
Grant date	Mar 10, 2020

Abstract

A refrigerant compressor includes a compression mechanism portion, a drive portion, a crankshaft, a main bearing and an auxiliary bearing that support the crankshaft, and a sealed container that accommodates therein the compression mechanism portion, the drive portion, the crankshaft, the main bearing, and the auxiliary bearing. The auxiliary bearing is configured of an antifriction bearing and provided in an auxiliary bearing housing attached to the sealed container. The auxiliary bearing housing includes an opening for inserting the auxiliary bearing on the drive portion side, and includes a housing cover covering the opening. An insulating sleeve configured of an insulating material is provided between the crankshaft and the auxiliary bearing. The insulating sleeve includes a cylinder portion located between the crankshaft and the auxiliary bearing, and a flange portion located between the auxiliary bearing and the housing cover and extended in an outer diameter direction.

First claim

The invention claimed is:

1. A refrigerant compressor comprising:
a compression mechanism portion that compresses a refrigerant;
a drive portion for driving the compression mechanism portion;
a crankshaft that is rotationally driven by the drive portion;
a main bearing that rotationally supports a main shaft portion of the crankshaft on the compression mechanism portion side of the drive portion;
an auxiliary bearing that rotationally supports an auxiliary shaft portion of the crankshaft on a side of the drive portion opposite to the compression mechanism portion; and
a sealed container that accommodates therein the compression mechanism portion, the drive portion, the crankshaft, the main bearing, and the auxiliary bearing,
wherein the auxiliary bearing is configured of an antifriction bearing including an inner race, an outer race, and a rolling element, and is provided in an auxiliary bearing housing attached to the sealed container,
wherein the auxiliary bearing housing includes an opening for inserting the auxiliary bearing on the drive portion side, and includes a housing cover covering the opening,
wherein an insulating sleeve configured of an insulating material is provided between the crankshaft and the auxiliary bearing,
wherein the insulating sleeve includes a cylinder portion located between the crankshaft and the auxiliary bearing, and a flange portion located between the auxiliary bearing and the housing cover and extended in an outer diameter direction,
wherein the housing cover is for preventing an oil supplied to the auxiliary bearing from splashing to the drive portion side, and is configured so as to cover a portion from an outer circumferential side of the crankshaft to a portion of the outer race of the auxiliary bearing,
wherein the antifriction bearing configuring the auxiliary bearing is a ball bearing, and
wherein the flange portion of the insulating sleeve is extended further in an outer diameter direction than an inner diameter of the inner race of the auxiliary bearing.

2. The refrigerant compressor according to claim 1 , wherein the housing cover includes an inner portion where a flow passage through which an oil flows is formed by providing a large clearance between the inner race of the auxiliary bearing and the housing cover, and an outer portion where a clearance between the outer race of the auxiliary bearing and the housing cover is made smaller than the clearance of the flow passage in the inner portion.

3. The refrigerant compressor according to claim 2 , wherein the flange portion of the insulating sleeve is configured to be extended further in an outer diameter direction than an outer diameter of the inner race of the ball bearing so that movement in an axial direction is restricted by the outer portion of the housing cover.

4. The refrigerant compressor according to claim 3 , wherein an opening for allowing an oil to flow to the rolling element side of the auxiliary bearing is formed in the flange portion of the insulating sleeve.

5. The refrigerant compressor according to claim 1 , wherein the refrigerant compressor is a vertical type scroll compressor,
the scroll compressor includes an oil reservoir provided in a lower portion of the interior of the sealed container, an oil passage formed so as to penetrate the crankshaft in an axial direction, an oil supply pump provided on a lower end portion side of the crankshaft for supplying an oil in the oil reservoir to the oil passage, and an oil supply hole formed in the crankshaft in a radial direction for supplying a part of the oil flowing through the oil passage to the auxiliary bearing, and
the scroll compressor is configured such that after the oil is introduced between the auxiliary bearing and the housing cover through the oil supply hole, the oil is supplied to the auxiliary bearing.

Assignees

• Hitachi Johnson Controls Air Conditioning Inc

Inventors

• Kozuma Yuko
• Iizuka Yasuaki
• Matsunaga Mutsunori
• Ohtahara Masaru

Classifications

• F04C2240/50

  Bearings · CPC title

• F04B39/00 Primary

  Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00 · CPC title

• F04C27/008

  for other than working fluid, i.e. the sealing arrangements are not between working chambers of the machine · CPC title

• F04C23/008

  Hermetic pumps · CPC title

• F25B31/002

  Lubrication · CPC title