Lubricant oil for a refrigeration machine, lubricant composition and refrigeration machine and system

• US 7,972,529 B2
• Filed: 06/08/2010
• Issued: 07/05/2011
• Est. Priority Date: 06/30/2005
• Status: Expired due to Fees

• Current Assignee: Embraco Indústria de Compressores e Soluções em Refrigeração LTDA (Nidec Corporation)
• Original Assignee: Whirlpool SA (Whirlpool Corporation)
• Inventors: Machado, Rosangela Maria
• Primary Examiner(s): McGinty; Douglas
• Application Number:
  US12/795,955
• Publication Number:
  US 20100249002A1
• Time in Patent Office: 392 Days
• Field of Search: 252/68, 252/67, 508/110, 625/02
• US Class Current: 252/68
• CPC Class Codes: C10M 105/06 aromatic
• CPC Class Codes: C10M 171/008 Lubricant compositions compatible with refrigerants
• CPC Class Codes: C10M 2203/065 used as base material
• CPC Class Codes: C10N 2020/02 Viscosity; Viscosity index
• CPC Class Codes: C10N 2020/04 Molecular weight; Molecular weight distribution
• CPC Class Codes: C10N 2020/069 Linear chain compounds
• CPC Class Codes: C10N 2020/103 Containing Hydrocarbons
• CPC Class Codes: C10N 2040/30 Refrigerators lubricants or compressors lubricants

Abstract

A lubricant oil for a refrigeration machine, and refrigeration machine, said refrigeration machine being of the type that operates with a refrigerant consisting of at least one component of the HC (hydrocarbon) group, the lubricant oil consisting of an alkylbenzene oil containing at least 80% by weight of alkylbenzene having a molecular weight of 120-288 and having a viscosity between about 3.0 and 7.0 cSt at a temperature of 40° C. and the lubricant composition consisting of said alkylbenzene oil and until about 8% by weight of one or more additives selected from a group consisting of improvers of oxidation resistance and thermal stability, corrosion inhibitors, metal inactivators, lubricity additives, viscosity index improvers, reducers of fluidity and flocculation point, detergents, dispersants, antifoaming agents, antiwear agents and extreme pressure resistant additives.

Claims

1. A lubricant oil for a refrigeration machine which operates with a refrigerant consisting of at least one HC (hydrocarbon) group component, characterized in that it comprises an alkylbenzene oil containing at least 90% by weight of straight-chain alkylbenzene selected from a straight-chain alkyl group with lateral paraffinic chain of 10-13 carbon atoms with an average molecular weight of 239-244 g/Mol, and having a viscosity between about 4.0 and 5.0 cSt at a temperature of 40°

C.

2. The lubricant oil, as set forth in claim 1, characterized in that the alkylbenzene contains 1-4 alkyl groups, each group containing 10-13 carbon atoms.

3. The lubricant oil, as set forth in claim 1, characterized in that the alkylbenzene is selected from the group consisting of monoalkylbenzene, dialkylbenzene or a mixture thereof.

4. Refrigeration machine for operating with a refrigerant consisting of at least one component of the HC (hydrocarbon) group, characterized in that the refrigeration machine comprises a lubricant oil constituted by an alkylbenzene oil containing at least 90% by weight of straight-chain alkylbenzene selected from a straight-chain alkyl group with lateral paraffinic chain of 10-13 carbon atoms with an average molecular weight of 239-244 g/Mol,

and having a viscosity between about 4.0 and 5.0 cSt at a temperature of 40°

C.

10. Refrigeration machine, as set forth in claim 4, characterized in that the alkylbenzene contains 1-4 alkyl groups, each group containing 10-13 carbon atoms.

11. Refrigeration machine, as set forth in claim 10, characterized in that the alkylbenzene is selected from the group consisting of monoalkylbenzene, dialkylbenzene or a mixture thereof.

5. Refrigeration machine for operating with a refrigerant consisting of at least one component of the HC (hydrocarbon) group, characterized in that that the refrigeration machine comprises a lubricant composition constituted by:

an alkylbenzene oil containing at least 90% by weight of straight-chain alkylbenzene, selected from a straight-chain alkyl group with lateral paraffinic chain of 10-13 carbon atoms with an average molecular weight of 239-244 g/Mol, and having a viscosity between about 4.0 and 5.0 cSt at a temperature of 40°

C.; and

from 0.01-5.0 by weight of one or more additives selected from a group consisting of at least one type of phosphorous compound selected from phosphoric ester and phosphorous esters.

6. Refrigeration machine, as set forth in claim 5, characterized in that the alkylbenzene is selected from the group consisting of monoalkylbenzene, dialkylbenzene or a mixture thereof.

12. Refrigeration machine, as set forth in claim 5, characterized in that the alkylbenzene contains 1-4 alkyl groups, each group containing 10-13 carbon atoms.

7. Lubricant composition for use in a refrigeration machine which operates with a refrigerant consisting of at least one component of an HC (hydrocarbon) group, characterized in that it comprises:

an alkylbenzene oil containing at least 90% by weight of straight-chain alkylbenzene selected from a straight-chain alkyl group with lateral paraffinic chain of 10-13 carbon atoms with an average molecular weight of 239-244 g/Mol, and having a viscosity between about 4.0 and 5.0 cSt at a temperature of 40°

C.; and

from 0.01-5.0% by weight of one or more additives selected from the group consisting of at least one type of phosphorous compound selected from phosphoric ester and phosphorous esters.

8. Lubricant composition, as set forth in claim 7, characterized in that the alkylbenzene is selected from the group consisting of monoalkylbenzene, dialkylbenzene or a mixture thereof.

9. Lubricant composition, as set forth in claim 7, characterized in that the additive is provided in the range of 0.01-3.0% by weight based on the total amount of the lubricant oil composition for refrigeration.