| 摘要 |
<p>PROBLEM TO BE SOLVED: To improve airtightness by covering the inner and outer circumferences and the upper and lower ends of a winding and also a lead wire projected toward the exterior of the winding with moisture-proof sheets and sealing a joint part at which the moisture-proof sheets are joined together by fusing. SOLUTION: The inner and outer circumferences of a high-voltage winding 2a and the upper and lower ends of a winding 2 and also a lead wire 5 projected to the exterior of the winding 2 are respectively covered with moisture-proof sheets 41a, 41c, 41d comprising a fusible polyethylene film. The respective joint parts 6a, 6c, 6b, 6d of moisture-proof sheets 41a, 41b, and moisture-proof sheets 41c, 41d are held between heated press-fitting parts and press-fitted by heat whereby a polyester film forming the respective parts 6 is melted and thermally welded to airtightly join the respective moisture-proof sheets 41 together and fix them. Therefore, the quality of the winding 2 can be maintained and airtightness can be held without damaging moisture-proofness.</p> |
