HERMETIC TYPE COMPRESSOR AND REFRIGERATION CYCLE APPARATUS

• US 20110067434A1
• Filed: 11/24/2010
• Published: 03/24/2011
• Est. Priority Date: 05/28/2008
• Status: Abandoned Application

• Current Assignee: Toshiba Carrier Corporation (Carrier Global Corporation)
• Original Assignee: Toshiba Carrier Corporation (Carrier Global Corporation)
• Inventors: SATODATE, Koji, FUTAMI, Toshihiko, MIURA, Kazuhiko
• Application Number:
  US12/953,731
• Publication Number:
  US 20110067434A1
• Time in Patent Office: Days
• US Class Current: 62/498
• CPC Class Codes: F01C 21/02 Arrangements of bearings bearing constructions F16C
• CPC Class Codes: F04C 18/3562 the inner and outer member being in contact along one line or continuous surfaces substantially parallel to the axis of rotation
• CPC Class Codes: F04C 2240/52 for assemblies with supports on both sides
• CPC Class Codes: F04C 2240/601 Shaft flexion
• CPC Class Codes: F04C 23/001 of similar working principle
• CPC Class Codes: F04C 23/008 Hermetic pumps
• CPC Class Codes: F04C 29/12 Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet

Abstract

As a hermetic type compressor, a motor portion and a compression mechanism portion that are coupled to the motor portion with a rotating shaft interposed therebetween are accommodated in a closed vessel. The compression mechanism portion comprises a cylinder that comprises an internal diameter hole, and a main bearing and a sub-bearing in which a bearing hole that journals the rotating shaft is provided and the internal diameter hole of the cylinder is closed to form a compression chamber in the compression mechanism portion. The main bearing and the sub-bearing have a circular groove that is opened toward the compression chamber side, an inner circumferential surface of the circular groove is tapered such that a diameter increases gradually from the compression chamber side toward an opposite side of the compression chamber side, and a depth of the circular groove is set to 40% of a diameter of the bearing hole.

Claims

1. A hermetic type compressor in which a motor portion and a compression mechanism portion that are coupled to the motor portion with a rotating shaft interposed therebetween are accommodated in a closed vessel,

wherein the compression mechanism portion comprises:

a cylinder that comprises an internal diameter hole; and

a main bearing and a sub-bearing, in which a bearing hole that journals the rotating shaft is provided and the internal diameter hole of the cylinder is closed to form a compression chamber in the compression mechanism portion,

at least one of the main bearing and the sub-bearing has a circular groove that is opened toward the compression chamber side,

an inner circumferential surface of the circular groove is tapered such that a diameter increases gradually from the compression chamber side toward an opposite side of the compression chamber side, and

a depth L of the circular groove is set to at least 40% of a diameter D of the bearing hole.

2. The hermetic type compressor according to claim 1, wherein, in the main bearing or sub-bearing that comprises the circular groove, a minimum wall thickness b between an inner circumferential surface of the circular groove and a circumferential surface of the bearing hole is set so as to satisfy a relationship of an equation (1):

0.09×

diameter D of bearing hole≧

minimum wall thickness b≧

0.04×

diameter D of bearing hole  

 

(1).

3. The hermetic type compressor according to claim 1, wherein a compression chamber of the compression mechanism portion accommodates an eccentric portion that is eccentrically provided while integrated with the rotating shaft and a rolling piston that is fitted in the eccentric portion to rotate eccentrically in the compression chamber in association with rotation of the rotating shaft, and

assuming that e is an eccentric amount of the eccentric portion and r is an outer circumferential radius of the rolling piston, an outer circumferential radius g of the circular groove satisfies relationships of equations (2) and (3):

0.5 mm≦

[outer circumferential radius r (mm) of rolling piston−

eccentric amount e (mm) of eccentric portion]−

outer circumferential radius g (mm) of circular groove  

 

(2)

outer circumferential radius g (mm) of circular groove>

diameter D (mm) of bearing hole/2+minimum wall thickness b (mm)  

 

(3).

4. The hermetic type compressor according to claim 1, wherein the main bearing and the sub-bearing have a flange whose wall thickness is set to a depth L of the circular groove or less.

5. A refrigeration cycle apparatus comprising:

the hermetic type compressor according to claim 1;

a condenser;

an expansion device; and

an evaporator.