REFRIGERATION APPARATUS

• US 20150300698A1
• Filed: 10/31/2013
• Published: 10/22/2015
• Est. Priority Date: 10/31/2012
• Status: Abandoned Application

• Current Assignee: Daikin Industries Ltd
• Original Assignee: Daikin Industries Ltd
• Inventors: TANAKA, Masaru, MATSUURA, Hideki, TAIRA, Shigeharu, NAKAI, Akinori
• Application Number:
  US14/439,626
• Publication Number:
  US 20150300698A1
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: C09K 2205/24 Only one single fluoro component present
• CPC Class Codes: C09K 5/045 containing only fluorine as halogen
• CPC Class Codes: C10M 171/008 Lubricant compositions compatible with refrigerants
• CPC Class Codes: C10M 2203/04 Well-defined cycloaliphatic compounds
• CPC Class Codes: C10M 2207/042 Epoxides
• CPC Class Codes: C10M 2207/2835 used as base material
• CPC Class Codes: C10M 2209/043 used as base material
• CPC Class Codes: C10M 2215/14 Containing carbon-to-nitrogen double bounds, e.g. guanidines, hydrazones, semicarbazones
• CPC Class Codes: C10N 2020/101 Containing Hydrofluorocarbons
• CPC Class Codes: C10N 2030/10 Inhibition of oxidation, e.g. anti-oxidants
• CPC Class Codes: C10N 2030/12 Inhibition of corrosion, e.g. anti-rust agents or anti-corrosives
• CPC Class Codes: C10N 2040/30 Refrigerators lubricants or compressors lubricants
• CPC Class Codes: F25B 13/00 Compression machines, plants or systems, with reversible cycle defrosting cycles F25B47/02

Abstract

A refrigeration apparatus includes a compressor, a condenser, an expansion mechanism, and an evaporator. A refrigerant containing R32 and refrigerator oil are used in the refrigeration apparatus. The refrigerator oil is used to lubricate the compressor. An acid scavenger added in an amount of 1.0 wt % to 5.0 wt % is blended in the refrigerator oil. The amount of air mixed into the refrigeration apparatus is controlled to 500 ppm or less relative to the amount of filled refrigerant. The amount of water mixed into the refrigeration apparatus is controlled to 300 ppm or less relative to the amount of filled refrigerant. A discharged-gas temperature of the refrigeration apparatus is controlled to 120° C. or less.

Claims

1. A refrigeration apparatus comprising;

a compressor;

a condenser;

an expansion mechanism; and

an evaporator,

an amount of air mixed in being controlled to 500 ppm or less relative to an amount of filled refrigerant, an amount of water mixed in being controlled to 300 ppm or less relative to the amount of filled refrigerant, and a discharged-gas temperature being controlled to 120°

C. or less,

refrigerant containing R32 and refrigerator oil used to lubricate the compressor being used in the refrigeration apparatus, and

an acid scavenger added in an amount of 1.0 to 5.0 wt % being blended with the refrigerator oil.

2. The refrigeration apparatus according to claim 1, wherein

the acid scavenger is added in an amount of 2.0 to 5.0 wt %.

3. The refrigeration apparatus according to claim 1, wherein

the expansion mechanism has an expansion valve;

and

fluorine is present in an amount of 6.0 wt % or less, and the fluorine is a decomposition product of the refrigerant adhering to the expansion valve.

4. The refrigeration apparatus according to claim 1, wherein

an extreme pressure agent is further blended with the refrigerator oil.

5. The refrigeration apparatus according to claim 1, wherein

an antioxidant is further blended with the refrigerator oil.

6. The refrigeration apparatus according to claim 1, wherein

the refrigerator oil contains polyvinyl ether oil.

7. The refrigeration apparatus according to claim 1, wherein

the refrigerator oil contains polyol ester oil.

8. The refrigeration apparatus according to claim 1, wherein

the refrigerant contains at least 60 wt % of R32.

9. The refrigeration apparatus according to claim 1, wherein

the refrigerator oil is one in which there is no separation in a mixture with the refrigerant during startup.

10. The refrigeration apparatus according to claim 9, wherein

an oil concentration exhibits a minimum value during startup in a process during which a temperature of the mixture rises, and the oil concentration is a concentration of the refrigerator oil contained in the mixture, and

a temperature at which separation occurs in the mixture for which the oil concentration is the minimum value

is −

35°

C. or greater, and

is also less than a temperature of the mixture when the oil concentration is the minimum value.

11. The refrigeration apparatus according to claim 2, wherein

the expansion mechanism has an expansion valve;

and

fluorine is present in an amount of 6.0 wt % or less, and the fluorine is a decomposition product of the refrigerant adhering to the expansion valve.

12. The refrigeration apparatus according to claim 2, wherein

an extreme pressure agent is further blended with the refrigerator oil.

13. The refrigeration apparatus according to claim 2, wherein

an antioxidant is further blended with the refrigerator oil.

14. The refrigeration apparatus according to claim 3, wherein

an extreme pressure agent is further blended with the refrigerator oil.

15. The refrigeration apparatus according to claim 3, wherein

an antioxidant is further blended with the refrigerator oil.

16. The refrigeration apparatus according to claim 4, wherein

an antioxidant is further blended with the refrigerator oil.