Hermetic or semi-hermetic refrigeration motor compressor unit

摘要

1. A refrigeration motor-compressor unit comprising a positive displacement rotary compressor (2, 8) driven by a motor (5, 6), means (11) for supplying refrigerating fluid in the innerspace of the motor for cooling the motor, said innerspace being connected by a piping (10) to an economiser hole (9) of said compressor, characterized by closure means (12, 112) disposed in said piping, said closure means being connected to an intake pressure of said compressor and being adapted to clear said piping (10) against biasing means (14) when the pressure at said economiser hole (9) exceeds by a predetermined differential amount said intake pressure, and to partially obturate said piping (10) in the contrary case.