Electric compressor, and refrigeration air-conditioning apparatus

Patent metadata

Field	Value
Publication number	US-10662934-B2
Application number	US-201816223323-A
Country	US
Kind code	B2
Filing date	Dec 18, 2018
Priority date	Nov 4, 2016
Publication date	May 26, 2020
Grant date	May 26, 2020

Abstract

An electric compressor is provided which has: in a sealed container, a compression mechanism to compress a refrigerant and an electric motor to drive the compression mechanism, wherein the refrigerant contains 20% by mass or more of hydrofluoroolefin, and a refrigerator oil stored in the sealed container contains; polyvinyl ether as a base oil; an alicyclic epoxy compound in an amount of 0.1% by mass or more and 2.0% by mass or less relative to the base oil; an aliphatic epoxy compound in an amount of 0.1% by mass or more and 2.0% by mass or less relative to the base oil; and tertiary phosphate in an amount of 0.1% by mass or more and 2.0% by mass or less relative to the base oil.

First claim

What is claimed is:

1. An electric compressor comprising;
in a sealed container, a compression mechanism to compress a refrigerant and an electric motor to drive the compression mechanism,
wherein the refrigerant contains 20% by mass or more of hydrofluoroolefin, and
wherein a refrigerator oil stored in the sealed container contains:
polyvinyl ether as a base oil,
an alicyclic epoxy compound in an amount of 0.1% by mass or more and 2.0% by mass or less relative to the base oil,
an aliphatic epoxy compound in an amount of 0.1% by mass or more and 2.0% by mass or less relative to the base oil, and
tertiary phosphate in an amount of 0.1% by mass or more and 2.0% by mass or less relative to the base oil.

2. The electric compressor according to claim 1 , wherein
the electric motor drives the compression mechanism through a crankshaft supported by a rolling bearing to be lubricated with the refrigerator oil.

3. A refrigeration air-conditioning apparatus comprising the electric compressor according to claim 2 .

4. The electric compressor according to claim 1 , wherein
the hydrofluoroolefin is at least one selected from 2,3,3,3-tetrafluoropropene, 1,3,3,3-tetrafluoropropene, trifluoroethene, and 3,3,3-trifluoropropene.

5. A refrigeration air-conditioning apparatus comprising the electric compressor according to claim 4 .

6. The electric compressor according to claim 1 , wherein
the alicyclic epoxy compound is 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexanecarboxylate.

7. A refrigeration air-conditioning apparatus comprising the electric compressor according to claim 6 .

8. The electric compressor according to claim 1 , wherein
the aliphatic epoxy compound is at least one selected from an alkyl glycidyl ester compound and an alkyl glycidyl ether compound.

9. A refrigeration air-conditioning apparatus comprising the electric compressor according to claim 8 .

10. The electric compressor according to claim 1 , wherein
the tertiary phosphate is tricresyl phosphate.

11. A refrigeration air-conditioning apparatus comprising the electric compressor according to claim 10 .

12. The electric compressor according to claim 1 , wherein
the compression mechanism includes a revolving scroll member and a fixed scroll member which mesh with each other to form a compression chamber, and
the revolving scroll member and the fixed scroll member are formed with aluminum alloy.

13. A refrigeration air-conditioning apparatus comprising the electric compressor according to claim 12 .

14. A refrigeration air-conditioning apparatus comprising the electric compressor according to claim 1 .

15. The electric compressor according to claim 1 ,
wherein the polyvinyl ether is represented by formula

wherein R 1 is an alkyl group of 1 to 4 carbon atoms and m is an integer of 5 to 15,
wherein the alicyclic epoxy compound is 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexanecarboxylate,
wherein the aliphatic epoxy compound is either
2-ethylhexyl glycidyl ether or
alkyl glycidyl ester including an alkyl group of 4 to 9 carbon atoms, and

wherein the tertiary phosphate is tricresyl phosphate.

Assignees

• Hitachi Johnson Controls Air Conditioning Inc

Inventors

• OOTA Ryou
• Akata Hiroyuki
• Yoshida Yasutaka
• Naito Koji
• Ueda Hideyuki

Classifications

• F04C29/025

  using a lubricant pump · CPC title

• F04C29/023

  Lubricant distribution through a hollow driving shaft (F04C29/025 takes precedence) · CPC title

• C10N2040/30

  Refrigerators lubricants {or compressors lubricants} · CPC title

• C10M129/18

  Epoxides · CPC title

• F04B39/023

  Hermetic compressors · CPC title