Screw expander system

One kind of screw expander system, comprising an expansion space of the expansion of the working medium, the working medium inlet (21), the operating medium outlet (22), an oil inlet (23, 24) and the oil outlet (25, 26) of the screw expander (11), and the mixture was condensed from the screw expander (11) and the oil working medium condenser (13), the mixture from the condenser (13) of the pressure-feeding pump (14), and that the operation of the mixture oil vaporized working medium evaporator medium (15), from the evaporator (15) from the evaporator to the operating medium inlet (21) and the circulation and supply (15) is circulated and supplied to the oil inlet (23, 24), wherein , the mixture was separated interposed between the evaporator (15) and the expander screw (11) for the operation of the oil separating tank and oil medium (16), the oil separating tank (16) of the oil containing portion (29) of the screw expander (11) as an oil inlet (23, 24) is connected. To provide an oil pump without providing an oil supply mechanism supplying oil to the screw expander (11), the apparatus can be miniaturized screw expander system (10).