Multi-stage piston type compressor and a method for cooling an electric motor for a multi-stage piston type compressor

摘要

Multi-stage piston type compressor, consisting of a piston compressor (1), an electric motor (2) and a mechanical transmission (3), the the rotating movement of the electric motor (2) which converts into an oscillating linear movement and on the piston compressor (1), wherein the piston compressor (1) at least a working low pressure chamber (8) with an inlet (13) in the compressor housing and with a low pressure piston (9) and at least a working high pressure chamber (10) with an outlet (15) and with a high pressure piston (11) and the low pressure chamber (8) and the high pressure chamber (10) of the multi-stage piston compressor (1) by means of an overflow channel (17) are connected and the low pressure piston (9) and the high pressure piston (11) being designed in one piece and between the low pressure piston (9) and the high pressure piston (11) a volume variable free space (19) is located, characterized in that the working space (19) of the piston compressor (1) as a pressure - and the suction chamber is designed for a separate cooling air stream, and this free space (19), via the interior of the electric motor (2) with the..