IN163951B - - Google Patents

Abstract

1. Devices for the forced gas cooling of the rotor winding (W) of dynamoelectric machines, in particular of turbogenerators, in their winding head area, having, in the annular gap between the inner periphery of the winding head (WK) and the outer periphery (r11) of the rotor shaft journal (r1), cooling gas channels (gk1) which extend in the main axial direction towards the rotor body, - which channels, on the one hand, open into slot base channels (n2) of the body, from which the cooling gas flows radially - possibly obliquely - outwards through cooling gas bores (t1) of the rotor windings introduced into the slots of the body, with direct cooling of these rotor windings, and then crosses into the air gap through radial outlet apertures (k2) of the slot sealing wedges (K), - and from which, on the other hand, winding head cooling channels (gk2, gk3) branch off, through which the branched-off cooling gas portions can be guided along the coil sides of the winding head, characterised by the following features : a) the winding head (WK) is screened by an insulating material cylinder (1) on its inner periphery towards the flow chamber of the cooling gas channels ; b) the insulating material cylinder has cooling gas inlet apertures (2) in the transition region from the axially extending longitudinal coil sides (wk1) to the circumferentially extending front coil sides (wk2) of the winding head (bending region B) ; c) these inlet apertures (2) communicate with winding head cooling channels (gk2) both of tangential gap chambers (sp2) between the adjacent axially extending longitudinal coil sides (wk1) and of axial gap chambers (sp3) between the adjacent circumferentially extending front coil sides (wk2) ; d) leaving winding head cooling channels (gk2, gk3) free there are inserted into the tangential gap chambers (sp2) and into the axial gap chambers (sp3) tangential-gap- and axial-gap-filling pieces (5.1, 5.2) which abut directly on both sides with support surfaces (5.0) against the longitudinal coil sides and the front coil sides (wk1, wk2) and are provided with recesses between their support surfaces (5.0), thus forming the winding head cooling channels (gk2, gk3) ; e) the winding head cooling channels (gk2, gk3) extend in meander- or wave-like manner with changing radial height and in the main axial and circumferential directions along the axially extending longitudinal coil sides and circumferentially extending front coil sides (wk1 and wk2) to winding head cooling gas outlet channels (gk4 and ZK) respectively.