| 摘要 |
1,135,894. Sealing stators. MASCHINENFABRIK OERLIKON. 5 June, 1967 [9 June, 1966 (2)], No. 25785/67. Heading B3A. In a method of making a stator for a dynamoelectric machine encapsulated in a housing a spacer tube 1 is inserted in the bore of a wound stator 2 and the diameter of the ends of the tube is widened, so that the internal diameter d is equivalent to that of the rotor plus the required air gap. End members 3 are welded to the tube ends and are in turn welded to a cylindrical outer housing, the interior of the tube being then machined to the diameter d. The housing is filled with crystal quartz sand of 0À5- 4 mm. grain size through tubular stubs provided thereon and subjected to prolonged drying in vacuo. An epoxy resin mixture, which is resistant when cured to corrosive liquids, is introduced under vacuum through the stub tubes. Connecting leads pass through the stub tubes and a layer of elastomeric material, e.g. a cast .silicon elastomer, is placed at the tops of the tubes to allow for some flexibility in the packing where the leads emerge therefrom. Finally, the tubes are sealed with a grommet, e.g. of silicone impregnated glass fibre, which is pressed down on the elastomer. The stub tubes may alternatively be packed with a porcelain cement or other ceramic mass, which is impregnated in vacuo, for example, with paraffin wax or an epoxy resin. In an alternative construction a spacer tube 6 is fitted over a stator 7 and its diameter is reduced at the ends prior to welding discs 8 thereinto. The space within 'the tube is then filled as in the previous embodiment. |
