MOTOR-DRIVEN COMPRESSOR

PURPOSE: To supplement deficiency of oil in a compression mechanism during low load operation by a method wherein an oil reservoir part is arranged at a high pressure chamber, a feed oil passage is formed between an oil reservoir part and the suction part of a compression mechanism by a method wherein an oil reservoir chamber is formed in a high pressure chamber, and a feed oil passage is formed between the oil reservoir part and the suction part of the compression mechanism and a valve opened and closed by a differential pressure exceeding a specified value is located in the feed oil passage. CONSTITUTION: A compressor revolves a revolution scroll 2B by the drive force of an electric motor 3, and low pressure gas is inputted to a compression mechanism 2 through a suction pipe 11, a lower pressure chamber 9, and a suction part 7. Gas is compressed in a compression chamber formed through engagement between a fixed scroll 2A and a revolving scroll 2B and high pressure gas is delivered through a delivery part 8, a high pressure chamber 10, and a delivery pipe 12. In which case, when the compressor is used in an inverter-driven air conditioner, the number of revolutions of a compressor is reduced during low load operation and a flow rate of gas sucked in a compression mechanism and an oil amount are reduced. Besides, during low load running, a pressure difference between a high pressure chamber and a low pressure chamber is reduced, and a valve body 16 is moved in an opening direction through the force of a spring 17, and oil gathering in the oil reservoir of a high pressure chamber 10 is supplied through a feed oil passage to the suction suction part 7 of the compression mechanism.