Patent ID: 11965681
Assignee: CARRIER CORPORATION
Field: Thermal processes and apparatus (Mechanical engineering)
Classification: CPC F | IPC F

Claim 6:
7. A lubricating method of a refrigeration system, wherein the refrigeration system comprises a compressor, a condenser, an evaporator, and a lubrication circuit, wherein the lubrication circuit is distinct from a refrigeration circuit of the refrigeration system, the lubrication circuit comprising a post-lubrication flow path connected from the compressor into the condenser and the evaporator respectively; and a pre-lubrication flow path connected from the condenser and the evaporator into the compressor respectively,
wherein the pre-lubrication flow path comprises a first branch connected to the condenser and a second branch connected to the evaporator respectively; and
the post-lubrication flow path comprises a third branch connected to the condenser and a fourth branch connected to the evaporator respectively,
wherein the method includes operating the lubrication circuit in a first lubrication mode and a second lubrication mode:
in the first lubrication mode, after flowing from the condenser via the first branch to the compressor for lubrication, a part of refrigerant for lubrication is enabled to flow back to the evaporator via the fourth branch; and
in the second lubrication mode, after flowing from the evaporator via the second branch to the compressor for lubrication, the part of refrigerant for lubrication is enabled to flow back to the condenser via the third branch.