CS256803B1 - Tightening part - Google Patents

Abstract

The tightening component for ensuring the cohesion of the stator bundle sheets of large electrical rotating machines is formed by a one-piece tightening plate, provided on the inner diameter with tightening fingers in a number corresponding to the number of stator grooves. In the space between the tightening fingers, radial air ducts are formed under the tightening plate on its inner and outer circumference, bounded by reinforcing partitions, preferably provided with holes. The tightening component is particularly suitable for ensuring the cohesion of the joles of the stator bundle of a large electrical rotating machine, in which the stator bundle is removable from the frame.

Description

SUMMARY OF THE INVENTION The present invention provides a clamping member for securing the stator bundle sheets of large electrical rotary machines that are constructed with a stator bundle removable from the frame.

It is known to use a stripping structure consisting of a stripping plate, generally of conventional structural steel, and stripping ridges, most often of non-magnetic material, for stripping the sheets of self-supporting stator bundles of large electrical machines. Sometimes a grate is included in such a clamping structure to allow direct ventilation of the outer package of the stator sheets.

The disadvantage of this embodiment is the high labor intensity, since the individual bearing plates have to be processed quite precisely in order to avoid additional deformation and also the relatively low stiffness of the whole system, so that the stator plates open, especially in the area of teeth, resulting in increased losses. A shrink plate made of structural steel also contributes to increased losses.

SUMMARY OF THE INVENTION The object of the present invention is to provide a clamping member which, to a large extent, removes the above-mentioned drawbacks, is simple and inexpensive to manufacture, and substantially

256 603 poured the resultant effect of hitherto used clamp structures ·

The essence of the tightening component for ensuring the coherence of the stator bundle plates according to the invention consists in that it consists of a one-piece tightening plate provided on the inner diameter with tightening fingers in a number corresponding to the number of stator grooves. According to a preferred embodiment of the invention, the reinforcing baffles are provided with openings.

Further improvements can be made by providing the pulling plate with recesses for the pulling elements on the outer circumference · It is also advantageous that the pulling part is made of antimagnetic material ·

The main advantages of the solution according to the invention are that the shrinking component provides a stronger metal stripping in the area of the teeth and direct cooling of the outer package of the stator beam · The choice of antimagnetic material for producing the shrinking component significantly reduces losses, thus contributing to higher electric machine efficiency the tightening component according to the invention is also labor-intensive, since in principle it is sufficient to machine only the surface that rests on the stator plates. · If the manufacturer of the tightening component decides to work on a larger scale, it is only aesthetic adjustments or or technological risers, as the part is best made by casting ·

The invention is explained in more detail below by way of example with reference to the drawing.

Fig. 1 schematically shows a view of a clamping member according to the invention with a partial cross-section, while

256 803 Fig. 2 is a cross-sectional view of the clamping member #

The clamping member is formed by a clamping plate 1 which, at its inner diameter, becomes a clamping finger 2 corresponding to the number of stator grooves # In the space between the clamping fingers 2 radial air ducts 3 are formed below the clamping plate JL. can be varied from fully enclosed to maximum open by enlarging holes 4, 5 provided in bulkheads 6 # 7 # bulkheads 6, 7 both reinforce the entire shrinking component and provide foundry-friendly transitions # external shape of the shrink plate 1. corresponds to the external shape of the stator plates # If necessary, a recess 8 can be formed in the pulling plate JL for attaching or guiding the longitudinal pulling members of the self-supporting stator bundle # The pulling part is made of casting of anti-magnetic material #

The tightening component for ensuring the stator bundle sheets are cohesive is particularly suitable for large electric rotary machines with a stator bundle detachable from the carcass

Claims (4)

Clamping member for securing the stator bundle sheets of large electric rotating machines, characterized in that it consists of a one-piece clamping plate (1) provided on the inner diameter with clamping fingers (2) in a number corresponding to the number of stator grooves, (2) radial air ducts (3), defined by reinforcing partitions (6, 7), are formed under the shrink plate (1) on its inner and outer circumference. 2. A clamping element according to claim 1, characterized in that the reinforcing partitions (6, 7) are provided with openings (4 $ 5). The clamping element according to claim 1, characterized in that the clamping plate (a) is provided on the outer circumference with recesses (8) for the clamping elements. 4. A clamping member according to claim 1, characterized in that it is made of an antimagnetic material.