CS213810B1 - Metal sheet web skeleton - Google Patents

Description

BACKGROUND OF THE INVENTION The present invention relates to a sheet metal ribbed carcass for rotating electrical machines.

The existing construction of sheet metal skeletons for electrical machines rotating in a closed version has some drawbacks. The skeleton with a smooth shell with welded fins is characterized by laborious and costly welding of the individual fins, which must ensure sufficient heat transfer from the skeleton shell to the cooling fins. The frame with hollow sheet fins for internal coolant circulation is suitable only for larger machines, where there is sufficient space in the rotor for axial cooling channels and where this method of cooling can be performed. The corrugated sheet metal skeleton is very flexible and ensuring a sufficient connection to the stator bundle of sheets is relatively difficult and laborious both in terms of mechanical and heat transfer. These are mostly single-purpose machines forming part of larger and more complicated equipment, where other problems concerning especially the placement and fastening of other parts such as feet, rating plate, ground screw, terminal blocks and machine shields are solved with respect to the design of the equipment itself and then these parts are missing at all.

The problem of securing the bearing shields of the machine is solved by the ribbed carcass according to the invention by providing on both faces at least three shaped sheet metal studs for bearing shield fastening screws abutting the shoulder in the carcass faces. . Fitted for

213 810

213 810 of the bearing shield mounting is formed either directly on the ends of the carcass housing or on an annular lock molded into the carcass housing at its edge and fastened to the carcass by welding. The bearing shields are fixed to the frame by means of screws.

An exemplary embodiment of a sheet-metal ribbed carcass according to the invention is shown in the drawing in which Fig. 1 represents a part of the carcass in axial section and Fig. 2 is a front view of the carcass.

The skeleton is formed by a curved sheet metal casing 11, on which the cooling fins 2 have been preformed by bending and pressing the sheet by gradual bending. The bearing shields are seated on the front abutment surfaces formed by shoulders 8 formed either directly at the edge of the skirt housing or at an annular lock 21 molded into the skirt housing at its edge and circumferentially welded. The shields are fastened by screwing to three molded metal stampings 22 regularly spaced at 120 ° at the face of the carcass shell 1 and welded in the gaps between the cooling fins 2. The regular placement of the fasteners ensures an even stress of the shields and the machine frame during operation.

Claims (2)

SUBJECT OF THE INVENTION Sheet metal ribbed framework for rotating electric machines, characterized in that it is provided on both faces with at least three shaped sheet metal stampings (22) with holes for fastening bolts of bearing shields abutting the shoulder (9) in the ends of the frame, wherein sheet metal stampings (22). ) are spaced regularly around the skeleton face and are welded between the cooling fins (2). The ribbed metal frame according to claim 1, characterized in that the shoulder (8) for receiving the bearing shields is formed on an annular lock (21) pressed into the carcass shell (1) at its edge and fixed by a weld.