CS218866B1 - The method of impregnation, wound knots of large electrical machines - Google Patents

Abstract

The invention relates to a method for impregnating winding nodes of large electrical machines and the production of rotating electrical machines. The aim is to achieve high-quality, rationally obtained impregnation of winding stators and rotors or individual core winding bundles, while eliminating problems of processability or losses due to the remaining impregnating resin, conditioned by technology. The task consists in completely filling all hollow spaces in the grooves with impregnating resin without using vacuum or pressure, while the impregnating resin should not remain in the containers. According to the invention, partially open grooves are filled by pouring in a highly reactive synthetic resin, hard at room temperature, in a fine-grained state, and with slow rotation, the nodes are heated from above until the synthetic resin gels. The filling of the synthetic resin and the heating are repeated if the grooves are not filled with synthetic resin. The synthetic resin, flowing down in drops, is caught in a diluent and used for final spraying.

Description

INVENTORY OFFICE AND OBJECTIVES 0 o * - PV. TIME. / DPIČTA 202 ¢ 10 05 'Q — WHAT IS ABOUT HA3BAHKE H30EPETEHHH pRIL - ÚTVAR | REF j POWER 2 1

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AND

I ΑΗΗΟΤΑΜ

I OFFICIAL AND DISCOVER OFFICE

TIME. -ΚΛ, Η IN PERSON / PILTI POINT START AEF VYŘÍZ 00 2 340o_ o (J> ι- Ο cn> • -5x

H3odpeTeiize zacaeTca cnocoda ιιροπζτκζ ο6μοτβηηηχ y3JiOB djn> -iinix ojieKTpzzecKZX MainzH of KacaeTca Z3roTOBJieHza BpanawixcHaneKTpiraecKHX Mamm.

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Claims (12)

OBJECT OF THE INVENTION A method for impregnating wound knots of large electrical machines in which grooves using wedge wedges, including intermediate spaces for passage of impregnating agent, are filled at room temperature with a hard synthetic resin, cured during heating, characterized in that when tilting the groove plane with respect to the horizontal by 45 °, with the slit-ups up, filling the highly reactive low surface tension synthetic resin in the fine-grained condition, and the knot slowly rotating further so that the groove half is rotated, the penetrated synthetic resin is heated above its melting point, and the revolutions of the heating knot are synchronized with the synthetic resin such that gelatinization or curing process occurs in the quarter-turn, that feeding and heating during rotation and / or during the knot multi-turn is repeated as often as not all the grooves are completely filled with synthetic resin and finally all synthetic resin cures completely when heated. 2. An impregnation process according to claim 1, characterized in that the synthetic resin is bonded with a laminated plastic wedge wedge and the grooves 13 are partially covered so that 5 cm long wedge wedges are inserted at a distance of 3 cm. 3. An impregnation method according to claim 2, characterized in that high-load centrifugal force cycles and cyclic loading after the grooves have been filled with synthetic resin, if necessary at an elevated knot temperature, will move the already slotted wedges until they are in contact with each other and fully cover. the grooves are complemented by other grooved grooves. -13. 4. The method of impregnation according to claim 1, wherein the synthetic resin is distributed axially through the internal longitudinal grooves of the grooves. 5. The method of impregnation according to claim 1, wherein the synthetic resin is applied by spraying partially wound knots. 6. The method of impregnation according to claim 1, wherein the synthetic resin already enters the grooves and between the coil layers when wrapping. 7. The method of impregnation according to claim 1, wherein the hard synthetic resin is coupled to a low boiling diluent for supply. 8. The method of impregnation according to claim 1, wherein the synthetic resin heats from the wound, pre-heated node by transfer. 9. The method of impregnation according to claim 1, wherein the heating of the synthetic resin is induced by irradiation with infrared rays. 10. The method of impregnation according to claim 9, wherein the synthetic resin is specially selected for infrared rays, especially an epoxy resin with up to 20% finely dispersed, electrically insulating dark color pigment. 11. The method of impregnation according to claim 1, wherein the synthetic resin flowing in the droplets or flowing out during impregnation of the knot is trapped in the bath by the fluid. 12. An impregnation process according to claim 8, wherein the flowing or dripping synthetic resin is trapped in a bath with a diluent, especially ethyl glycol, while diluting and consequently cooling rapidly, and at a knot rotating in an elevated fashion. at a speed, by spraying the diluted synthetic resin, and then heated for curing. Recognized by the invention on the basis of the results of expertise, conducted by the Inventory and Patent Office, Berlin, DD.