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US 10,295,231 B2Granted
Cooling system
AssigneeAktiebolaget Skf
InventorsRudolf Hauleitner, Mario Kammerhuber, Guillermo Morales Espejel, Hans Wallin
Life of this patent
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Abstract
A cooling system includes a refrigerant compressor and a first operating medium, which provides a mixture of refrigerant and lubrication oil. An oil separator reduces the percentage of the refrigerant in the operating medium to a value between 25% by weight and 80% by weight.
Claims20
A cooling system, comprising:
- a refrigerant compressor, and
- an oil separator configured to separate a combined operating medium comprising a mixture of a refrigerant and a lubrication oil into a first operating medium and a second operating medium, wherein the second operating medium comprises between 25% by weight and 80% by weight of the refrigerant so that the second operating medium is lubrication oil enriched compared to the first operating medium, wherein the refrigerant compressor is configured to compress at least a portion of the first operating medium,
- wherein the second operating medium has a viscosity ratio of κ<1 in a first operating state of the cooling system and serves for lubricating at least one bearing site of a rotor of the refrigerant compressor,
- wherein the at least one bearing site comprises at least one angular ball bearing, which comprises an inner ring, an outer ring and balls rolling therebetween,
- wherein at least a first ball comprises a ceramic.
2 more elements
A method, comprising:
- separating, using an oil separator, a combined operating media comprising refrigerant and lubrication oil, to produce a first operating medium and a second operating medium, the second operating medium having a refrigerant content of between 25% by weight and 80% by weight and being lubrication oil enriched as compared to the first operating medium;
- lubricating at least one bearing site of a refrigerant compressor using the second operating medium, wherein the second operating medium in the at least one bearing site has a viscosity ratio of κ<1 when the refrigerant compressor is in a first operating state, wherein the bearing site comprises at least one angular ball bearing, which comprises an inner ring, an outer ring and balls rolling therebetween, and wherein at least a first ball comprises a ceramic;
- compressing at least the first operating medium by operating the refrigerant compressor in the first operating state;
- mixing the first and second operating media to produce the combined operating media;
- and
- feeding the combined operating media to the oil separator.
3 more elements
Dependencies are inferred from the claim text.