Working fluid, freezer, and freezer oil

Patent metadata

Field	Value
Publication number	US-12344809-B2
Application number	US-202118038540-A
Country	US
Kind code	B2
Filing date	Nov 26, 2021
Priority date	Nov 30, 2020
Publication date	Jul 1, 2025
Grant date	Jul 1, 2025

Abstract

A working fluid filled in a refrigerant circulation system comprising a compressor, a condenser, an expansion mechanism, an evaporator, and an accumulator, the working fluid comprising: a refrigerant; and a refrigerating machine oil, wherein the refrigerant comprises a hydrocarbon refrigerant having 2 to 4 carbon atoms, the refrigerating machine oil has a mixed aniline point of 20° C. or higher and 50° C. or lower and a viscosity index of 110 or more, an amount of the refrigerant dissolved in the working fluid is 40% by mass or less under conditions of a temperature of 80° C. and an absolute pressure of 2.8 MPa, and the refrigerating machine oil has a kinematic viscosity at −10° C. of 200 mm 2 /s or more and 3000 mm 2 /s or less.

First claim

The invention claimed is:

1. A working fluid filled in a refrigerant circulation system comprising a compressor, a condenser, an expansion mechanism, an evaporator, and an accumulator, the working fluid comprising:
a refrigerant; and
a refrigerating machine oil,
wherein the refrigerant consists of a hydrocarbon refrigerant having 2 to 4 carbon atoms,
the refrigerating machine oil has a mixed aniline point of 20° C. or higher and 50° C. or lower and a viscosity index of 140 or more,
an amount of the refrigerant dissolved in the working fluid is 40% by mass or less under conditions of a temperature of 80° C. and an absolute pressure of 2.8 MPa,
the refrigerating machine oil has a kinematic viscosity at −10° C. of 200 mm 2 /s or more and 3000 mm 2 /s or less, and
refrigerating machine oil has a flash point of 250° C. or higher.

2. The working fluid according to claim 1 , wherein the refrigerating machine oil has a kinematic viscosity at −20° C. of 10000 mm 2 /s or less.

3. The working fluid according to claim 1 , wherein the refrigerating machine oil comprises a phosphorus-containing antiwear agent.

4. The working fluid according to claim 1 , wherein an amount of the refrigerant dissolved in the working fluid is 15% by mass or less under conditions of a temperature of 40° C. and an absolute pressure of 0.7 MPa.

5. A refrigerating machine comprising a refrigerant circulation system comprising a compressor, a condenser, an expansion mechanism, an evaporator, and an accumulator,
wherein the refrigerant circulation system is filled with a working fluid comprising a refrigerant and a refrigerating machine oil,
the refrigerant consists of a hydrocarbon refrigerant having 2 to 4 carbon atoms,
the refrigerating machine oil has a mixed aniline point of 20° C. or higher and 50° C. or lower and a viscosity index of 140 or more,
an amount of the refrigerant dissolved in the working fluid is 40% by mass or less under conditions of a temperature of 80° C. and an absolute pressure of 2.8 MPa,
the refrigerating machine oil has a kinematic viscosity at −10° C. of 200 mm 2 /s or more and 3000 mm 2 /s or less, and
refrigerating machine oil has a flash point of 250° C. or higher.

6. A refrigerating machine oil filled in a refrigerant circulation system comprising a compressor, a condenser, an expansion mechanism, an evaporator, and an accumulator, with a refrigerant,
wherein the refrigerant comprises a hydrocarbon refrigerant having 2 to 4 carbon atoms,
the refrigerating machine oil has a mixed aniline point of 20° C. or higher and 50° C. or lower and a viscosity index of 140 or more,
an amount of the refrigerant dissolved in the working fluid is 40% by mass or less under conditions of a temperature of 80° C. and an absolute pressure of 2.8 MPa,
the refrigerating machine oil has a kinematic viscosity at −10° C. of 200 mm 2 /s or more and 3000 mm 2 /s or less,
the refrigerating machine oil comprises no mineral oil, and
refrigerating machine oil has a flash point of 250° C. or higher.

7. The working fluid according to claim 1 , wherein the refrigerating machine oil comprises no mineral oil.

8. The refrigerating machine according to claim 5 , wherein the refrigerating machine oil comprises no mineral oil.

Assignees

• Eneos Corp

Inventors

• MIZUTANI Yuya
• Yamaguchi Kentaro
• Okazaki Motoya
• Ogata Hidetoshi

Classifications

• F25B43/02

  for separating lubricants from the refrigerant · CPC title

• F25B1/00

  Compression machines, plants or systems with non-reversible cycle (F25B3/00, F25B5/00, F25B6/00, F25B7/00, F25B9/00 take precedence) · CPC title

• C10N2040/30

  Refrigerators lubricants {or compressors lubricants} · CPC title

• C10N2030/06

  Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure · CPC title

• C10N2030/02

  Pour-point; Viscosity index · CPC title