| 摘要 |
A sealed compressor (20) comprising a housing (24) incorporating an electric motor (25) and a compressor pump unit (22), a shaft (32) driven by said electric motor (25) for driving said compressor pump (22) unit and a viscosity sensor (42) for measuring the viscosity of a lubricant in said sealed housing (24), said viscosity sensor (42) communicating with a controller (44), said controller (44) being operable to compare sensed viscosity to a minimum viscosity and effect a control operation should the sensed viscosity be below said minimum viscosity, wherein said controller (44) opens an unloader valve (40) for communicating, in use, a discharge line (34) to a suction line (36) if a sensed viscosity is below a minimum viscosiy. <IMAGE> |
