Motors having an air-gap jacket in particular for central heating accelerators and other like applications

Claim 1

MOTOR OF THE TYPE HAVING AN AIR-GAP JACKET FOR CENTRAL HEATING ACCELERATORS AND OTHER LIKE APPLICATIONS, WHEREIN THE AIR-GAP JACKET DEFINES TWO CAVITIES, ONE OF WHICH COMPRISES THE ROTOR AND THE OTHER THE STATOR AND THE WINDINGS, THE PART OF THE INNER CAVITY OPPOSED TO A PUMP COMMUNICATES WITH THE EXTERIOR ONLY BY WAY OF A VENT AND THE PART OF THE INNER CAVITY ADJACENT THE PUMP COMMUNICATES WITH THE FLUID DRIVEN BY THE PUMP THROUGH A FILTER HAVING SUCH DIMENSIONAL CHARACTERISTICS AS TO FILTER THE FLUID IN THE COURSE OF THE FIRST FILLING OF SAID INNER CAVITY WHILE INSURING THE EQUILIBRIUM OF THE PRESSURES ON BOTH SIDES OF SAID FILTER AND OB BOTH SIDES OF THE BEARING SLEEVE FOR THE SHAFT OF THE MOTOR, PRACTICALLY NO CIRCULATION OF FLUID THEREFORE OCCURING BETWEEN SAID INNER CAVITY AND THE EXTERIOR, THE AIR GAP AND THE THICKNESS OF TH EJACKET BEING ON ACCOUNT OF THE PURITY OF THE FLUID REDUCED TO THE MINIMUM VALUES CORRESPONDING TO THE CONDITIONS OF MECHANICAL MANUFACTURE, THE JACKET BEING STIFFENED AT ITS ENDS BY FLANGES COOPERATING WITH TORIC SEALING ELEMENTS MOUNTED ON THE BEARINGS AND THE CASE BEING PROVIDED, IN CONTRADISTINCTION TO THE USUAL PRACTICE IN THIS ART, WITH COOLING FINS.