Arrangement for cooling turbogenerators

Claim 1

A TURBO-GENERATOR COMPRISING A ROTOR, A STATOR SURROUNDING SAID ROTOR, MEANS FOR CIRCULATING A LIQUID COOLANT IN A CLOSED CIRCUIT IN HEAT TRANSFER RELATION WITH THE CONDUCTORS OF THE STATOR WINDING WHICH EXTEND LONGITUDINALLY FROM ONE END OF THE STATOR TO THE OTHER, A PRESSURE PLATE AT EACH END OF SAID STATOR, A GAS-TIGHT CASING ENCLOSING SAID STATOR AND ROTOR AND CONTAINING A GASEOUS COOLANT, SAID STATOR ALSO BEING PROVIDED WITH A PLURALITY OF COOLING CHANNELS FOR CIRCULATING THE GASEOUS COOLANT EXTENDING LONGITUDINALLY THEREIN FROM EACH END TOWARDS THE MIDDLE, AND ALSO BEING PROVIDED WITH A PLURALITY OF ENTRANCE SLOTS AT THE MIDDLE PORTION THEREOF AND WHICH EXTEND RADIALLY INWARD FROM THE OUTER SURFACE THEREOF TO SAID LONGITUDINALLY EXTENDING COOLING CHANNELS, SAID PRESSURE PLATES BEING PROVIDED WITH APERTURES THERETHROUGH IN ALIGNMENT WITH SAID LONGITUDINALLY EXTENDING COOLING CHANNELS, A FAN ON EACH END OF SAID ROTOR FOR CIRCULATING THE GASEOUS COOLANT THROUGH SAID COOLING CHANNELS IN OPPOSITE DIRECTIONS FROM THE MIDDLE PORTION TOWARDS THE STATOR ENDS AND THENCE THROUGH THE APERTURES IN SAID PRESSURE PLATES, THE INTAKES OF SAID FANS BEING IN COMMUNICATION RESPECTIVELY WITH THE GASEOUS COOLANT AS IT IS DISCHARGED FROM THE RESPECTIVE PRESSURE PLATE AT THE STATOR ENDS AND THE DISCHARGE SIDES OF SAID FANS BEING IN COMMUNICATION WITH SAID ENTRANCE SLOTS, AND HEAT EXCHANGERS LOCATED IN THE FLOW PATHS OF SAID GASEOUS COOLANT BETWEEN SAID FANS AND ENTRANCE SLOTS FOR EXTRACTING HEAT FROM SAID COOLANT.