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AssigneeBernard Zimmern
InventorsBernard Zimmern, Joseph L. Knopp
Estimating the term…
Liquid coming from the condenser or present in the fluid discharged by the compressor circulates in grooves provided between a stator 7 and a housing 10 of the motor at a distance from the coils (8, 9) thereof. The liquid cools the stator without any risk of short-circuit in the coils. The liquid may be urged by a centrifugal economizer separator 13 through the liquid outlet 16 thereof, towards liquid inlets 27 and 27'. The pressurized gas produced by separator 13 is sent in the motor housing through slit 17 and then, having cooled the coils, reaches economizer hole 12 of the compressor, through conduit 11. Thus, the heated gas is not sent to the intake of the compressor where it would reduce the compressor capacity and efficiency.
A method of cooling an electric motor of a hermetic motor compressor unit for compressing a main flow of refrigerant fluid in an at least partly gaseous state for supplying a refrigerating circuit in which said fluid is liquefied at least in part in a condenser and is vaporised at least in part in an evaporator, said method comprising the steps of:
A hermetic motor compressor unit comprising a rotary compressor adapted to compress a main flow of refrigerant fluid, an electric motor drivingly coupled to said rotary compressor for rotation therewith, said electric motor comprising a rotor mounted onto a shaft connecting the motor to the compressor, a stator mounted adjacent to the rotor in a motor housing connected to a casing of the compressor, separation means for separating in said refrigerant fluid a substantially gaseous portion thereof, means for supplying with said substantially gaseous portion a motor cavity provided in said housing adjacent a first side of said stator, said first side facing said rotor, conduit means connecting said motor cavity with a hole provided in the compressor casing in such a position as to be subjected, in use at full load, to a pressure intermediate between an intake pressure and a discharge pressure of the compressor, and channel means for guiding refrigerant fluid in heat exchange relationship with a second side of said stator, said second side being remote from said first side.
A refrigerating machine comprising a hermetic motor-compressor unit comprising a rotary compressor, a refrigerating circuit mounted operatively between a discharge port and an intake port of said compressor, an electric motor drivingly coupled to said rotary compressor for rotation therewith, said electric motor comprising a motor-rotor drivingly coupled to a compressor-rotor, a stator mounted adjacent to the motor-rotor in a motor housing connected to a casing of the compressor, separation means for separating in said refrigerating circuit a substantially gaseous portion of a refrigerant fluid present in use in said circuit, means for supplying with said substantially gaseous portion a motor cavity provided in said housing adjacent a first side of said stator, said first side facing said motor-rotor, conduit means connecting said motor cavity with a hole provided in the compressor casing in such a position as to be subjected, in use at full load, to a pressure intermediate between an intake pressure and a discharge pressure of the compressor, and channel means for guiding refrigerant fluid in heat exchange relationship with said stator adjacent a second side thereof which is remote from said first side.
Dependencies are inferred from the claim text.