Refrigerating apparatus

• US 6,948,336 B2
• Filed: 04/16/2002
• Issued: 09/27/2005
• Est. Priority Date: 09/20/1994
• Status: Expired due to Fees

• Current Assignee: Hitachi Appliances Incorporated (Hitachi, Ltd.)
• Original Assignee: Hitachi, Ltd.
• Inventors: Fujita, Makoto, Amo, Yoshikazu
• Primary Examiner(s): Tanner, Harry B.
• Application Number:
  US10/122,295
• Publication Number:
  US 20020108395A1
• Time in Patent Office: 1,260 Days
• Field of Search: 622/22, 621/963, 621/83, 624/74, 625/28, 621/14, 252/68
• US Class Current: 62/474
• CPC Class Codes: C09K 2205/22 All components of a mixture being fluoro compounds
• CPC Class Codes: C09K 5/045 containing only fluorine as halogen
• CPC Class Codes: F04C 2210/14 Lubricant
• CPC Class Codes: F04C 2210/26 Refrigerants with particular properties, e.g. HFC-134a
• CPC Class Codes: F04C 2270/195 Controlled or regulated
• CPC Class Codes: F04C 2270/44 Conditions at the outlet of a pump or machine
• CPC Class Codes: F04C 29/0014 with control systems for the injection of the fluid
• CPC Class Codes: F04C 29/0092 Removing solid or liquid contaminants from the gas under pumping, e.g. by filtering or deposition; Purging; Scrubbing; Cleaning
• CPC Class Codes: F25B 2700/21152 at the discharge side of the compressor
• CPC Class Codes: F25B 2700/2116 of a condenser
• CPC Class Codes: F25B 2700/21161 of the fluid heated by the condenser
• CPC Class Codes: F25B 31/002 Lubrication
• CPC Class Codes: F25B 31/008 by injecting a liquid
• CPC Class Codes: F25B 9/006 the refrigerant containing more than one component F25B9/004 takes precedence

Abstract

A liquid injection type scroll compressor is used to a refrigerating apparatus using hydrocarbon fluoride refrigerant which does not contain chlorine (HFC-125/HFC-143a/HFC-134a) as an operating fluid and an amount of an injected liquid is controlled according to a discharge temperature of the compressor. Further, ester oil and/or ether oil is used as refrigerator oil and a dryer is disposed in a refrigerating cycle. With this arrangement, a refrigerating cycle operation can be stably realized in a wide range without almost changing the arrangement of a conventional refrigerating apparatus.

Claims

1. A refrigerator comprising a scroll compressor, a condenser, a mixed refrigerant containing at least R-125 and R-143a, and a refrigerator oil composed of ester oil or ether oil, the refrigerator further comprising:

a liquid injection piping connecting downstream of said condenser to said scroll compressor,

expansion equipment provided in said liquid injection piping,

an electromagnetic valve provided upstream of said expansion equipment in said liquid injection piping, wherein said electromagnetic valve controls an amount of liquid injected into said scroll compressor, and

a dryer disposed in said refrigerating cycle downstream side of said condenser to remove water mixed into said refrigerating cycle.

2. A refrigerator according to claim 1, further comprising a controller for controlling a degree of opening of said electromagnetic valve to control an amount of liquid injected into said scroll compressor.

3. A refrigerator according to claim 1, wherein said electromagnetic valve controls an amount of liquid injected into said scroll compressor and said refrigerator is enabled to operate over a temperature range of −

60°

C. to +5°

C.

4. A refrigerator, comprising a scroll compressor, a condenser, a mixed refrigerant containing at least R-125 and R-143a, and a refrigerator oil composed of ester oil, the refrigerator further comprising:

piping connecting downstream of said condenser to said scroll compressor, said piping including an electromagnetic valve and expansion equipment, wherein said electromagnetic valve controls an amount of liquid fed by said piping into said scroll compressor, and

a strainer provided upstream of said electromagnetic valve.

5. A refrigerator according to claim 4, further comprising a controller for controlling a degree of opening of said electromagnetic valve to control an amount of liquid injected into said scroll compressor.

6. A refrigerator according to claim 4, wherein said electromagnetic valve controls an amount of liquid fed by said piping into said scroll compressor and said refrigerator is enabled to operate over a temperature range of −

60°

C. to +5°

C.

7. A refrigerator comprising a scroll compressor, a condenser, a mixed refrigerant containing at least R-125 and R-143a, and a refrigerator oil composed of ester oil, the refrigerator further comprising:

a liquid injection piping connecting downstream of said condenser to said scroll compressor,

expansion equipment provided in said liquid injection piping,

an electromagnetic valve provided upstream of said expansion equipment in said liquid injection piping, wherein said electromagnetic valve controls an amount of liquid injected into said scroll compressor, and

a strainer provided upstream of said electromagnetic valve.

8. A refrigerator according to claim 7, further comprising a controller for controlling a degree of opening of said electromagnetic valve to control an amount of liquid injected into said scroll compressor.

9. A refrigerator according to claim 7, wherein said electromagnetic valve controls an amount of liquid injected into said scroll compressor and said refrigerator is enabled to operate over a temperature range of −

60°

C. to +5°

C.