Turbo refrigerator

Patent metadata

Field	Value
Publication number	US-2016116190-A1
Application number	US-201414895805-A
Country	US
Kind code	A1
Filing date	May 29, 2014
Priority date	Jun 4, 2013
Publication date	Apr 28, 2016
Grant date	—

Abstract

A turbo refrigerator is provided with: a turbo compressor having a motor; an oil cooling unit which cools lubricating oil which is supplied to at least a portion of the turbo compressor; a refrigerant introduction part which introduces some of the refrigerant which circulates between an evaporator and a condenser into a motor accommodation space and the oil cooling unit; and a cooling unit which cools the refrigerant which is introduced into the motor accommodation space and the oil cooling unit.

First claim

1 . A turbo refrigerator comprising:
a turbo compressor having a motor; an oil cooling unit which cools lubricating oil which is supplied to at least a portion of the turbo compressor; a refrigerant introduction part which introduces some of a refrigerant which circulates between an evaporator and a condenser into a motor accommodation space and the oil cooling unit; and a cooling unit which cools the refrigerant which is introduced into the motor accommodation space and the oil cooling unit, wherein the cooling unit is a compressor which decompresses the insides of the motor accommodation space and the oil cooling unit, thereby cooling the refrigerant which is introduced into the motor accommodation space and the oil cooling unit, and recovers the refrigerant from the insides of the motor accommodation space and the oil cooling unit and then returns the refrigerant to the evaporator.

2 . The turbo refrigerator according to claim 1 , further comprising:
an oil returning unit which returns the lubricating oil accumulated in the motor accommodation space to an oil tank in which the lubricating oil is stored.

3 . The turbo refrigerator according to claim 2 , wherein the oil returning unit is an ejector which moves the lubricating oil by using a compressed refrigerant gas produced by the turbo compressor.

4 . The turbo refrigerator according to claim 1 ,
further comprising:
a bearing which rotatably supports a rotating shaft of the motor;
a first non-contact sealing mechanism and a second non-contact sealing mechanism
which are disposed further toward the rotor side of the motor than the bearing and arranged in an axial direction of the rotating shaft; and
a compressed gas supply part which supplies some of the compressed refrigerant gas
produced by the turbo compressor between the first non-contact sealing mechanism and the second non-contact sealing mechanism.

5 . A turbo refrigerator comprising:
a turbo compressor having a motor; an oil cooling unit which cools lubricating oil which is supplied to at least a portion of the turbo compressor; a refrigerant introduction part which introduces some of a refrigerant which circulates between an evaporator and a condenser into a motor accommodation space and the oil cooling unit; and a cooling unit which cools the refrigerant which is introduced into the motor accommodation space and the oil cooling unit, wherein the cooling unit is a compressor which decompresses the insides of the motor accommodation space and the oil cooling unit, thereby cooling the refrigerant which is introduced into the motor accommodation space and the oil cooling unit, and recovers the refrigerant from the insides of the motor accommodation space and the oil cooling unit and then returns the refrigerant to the evaporator, wherein the cooling unit is provided with a sub-refrigerator which cools the refrigerant which is introduced into the motor accommodation space and the oil cooling unit.

6 . The turbo refrigerator according to claim 2 , further comprising:
a bearing which rotatably supports a rotating shaft of the motor; a first non-contact sealing mechanism and a second non-contact sealing mechanism which are disposed further toward the rotor side of the motor than the bearing and arranged in an axial direction of the rotating shaft; and a compressed gas supply part which supplies some of the compressed refrigerant gas produced by the turbo compressor between the first non-contact sealing mechanism and the second non-contact sealing mechanism.

7 . The turbo refrigerator according to claim 3 , further comprising:
a bearing which rotatably supports a rotating shaft of the motor; a first non-contact sealing mechanism and a second non-contact sealing mechanism which are disposed further toward the rotor side of the motor than the bearing and arranged in an axial direction of the rotating shaft; and a compressed gas supply part which supplies some of the compressed refrigerant gas produced by the turbo compressor between the first non-contact sealing mechanism and the second non-contact sealing mechanism.

Assignees

• Daikin Ind Ltd

Inventors

• Oda Kentarou
• Yoshinaga Seiichiro
• Sakuma Nobuyoshi

Classifications

• F25B1/053 Primary

  of turbine type · CPC title

• F25B41/39

  Dispositions with two or more expansion means arranged in series, i.e. multi-stage expansion, on a refrigerant line leading to the same evaporator · CPC title

• F25B2400/13

  Economisers · CPC title

• F25B2500/01

  Geometry problems, e.g. for reducing size · CPC title

• F25B1/10

  with multi-stage compression (with cascade operation F25B7/00) · CPC title