公开(公告)号：US06467287B2

公开(公告)日：2002-10-22

申请号：US09930392

申请日：2001-08-15

申请人： Lars Ivan Sjoholm ,  Lee J. Erickson ,  Dean William Osterman

发明人： Lars Ivan Sjoholm ,  Lee J. Erickson ,  Dean William Osterman

IPC分类号： F25B3100

CPC分类号： F04C29/026 ,  F04C18/16 ,  F04C29/0007 ,  F04C2270/72 ,  F25B31/004 ,  F25B43/02 ,  F25B49/00

摘要： A compressor and oil separator assembly for compressing a fluid includes a suction end, a discharge end, and first and second rotors rotatably mounted between the suction and discharge ends. A discharge line communicates with the discharge end, and an oil separator communicates with the discharge line. An oil sump communicates with the oil separator and an oil supply line communicates between the oil sump and the rotors. A bleed line selectively communicates between the discharge line and the oil supply line for equalizing a pressure differential between the suction end and the discharge end without causing substantial backward rotation of the rotors or displacement of oil to the rotors through the oil supply line. Preferably, the assembly further includes a valve that defines a portion of the discharge line and is also coupled to the bleed line.

公开(公告)号：US5174123A

公开(公告)日：1992-12-29

申请号：US749358

申请日：1991-08-23

申请人： Lee J. Erickson

发明人： Lee J. Erickson

IPC分类号： F25B1/00 ,  F25B1/047 ,  F25B5/04 ,  F25B40/02 ,  F25B47/02

CPC分类号： F25B40/02 ,  F25B1/047 ,  F25B47/022 ,  F25B5/04 ,  F25B2400/13 ,  F25B2400/23

摘要： Methods and apparatus for eliminating the need for a float valve in a flash tank of a refrigeration system having an economizer cycle, improving stationary refrigeration systems and permitting a flash tank instead of a heat exchanger to be used in a transport refrigeration system having an economizer cycle. The refrigeration system includes a refrigerant compressor, a condenser, and an evaporator, with the flash tank being disposed between the condenser and evaporator. A liquid sub-cooling valve is disposed between the condenser and flash tank. The liquid sub-cooling valve opens and closes to maintain a desired degree of sub-cooling, with the liquid sub-cooling valve thus controlling refrigerant flow into the flash tank. Refrigerant flow out of the flash tank to the evaporator is controlled by a suction superheat thermostatic expansion valve. In a preferred embodiment, liquid leaving the flash tank is sub-cooled before entering the expansion valve.