SU1056367A1 - Rotor of vertical-shaft hydraulic-turbine generator - Google Patents

Abstract

ROTOR OF VERTICAL HYDROGENERATOR, containing rim, Cf). - /. .V5 e y -: - “-to detachably mounted on wedge strips connected to the skeleton, about t and u; This is due to the fact that, in order to increase reliability, it is tough on the rim. intermediate inserts are fixed, and the mating surfaces of the wedge strip in the inserts in the axial direction are made stepped with an equal arrangement of steps in height, with the radial distance from the axis of rotation of the rotor to these surfaces of the wedge strip and the insert for steps located higher compared with the lower limit steps.

Description

ate

U5

0

Co The invention relates to a design, in particular, to the rotors of large vertical synchronous electric machines, for example i-generators. The known rotor of the vertical hydrogenerator containing a rim, detachably mounted on wedge strips connected to the skeleton by means of supporting elements ij adjacent to the rim face. However, this device has a complex structure and does not provide the necessary reliability. The closest to the invention by technical essence and the achieved result is a rotor of a vertical hydrogenerator containing a frame with welded wedge beds, on which the rim is detachably fixed to each other using support elements fixed in grooves of wedge stripes 2j. A disadvantage of this device is that the JI mounting dismantling the rotor core separately of the rim can be performed only if there is a certain wiring between the pin and the rotor core and rim wheels. Moreover, the larger the diameter of the core, the greater the clearance required. The presence of a gap increases the mechanical stresses in the supporting elements, i.e. reduces the reliability of this device. With a large gap between the wedge bars of the cage and the rim, the reliability of the wedge joint of the cage with the rim against rotation is reduced. The purpose of the invention is to increase reliability. This goal is achieved by the fact that in the rotor of a vertical hydrogenerator containing a rim detachably mounted on wedge strips connected to the skeleton, intermediate inserts are rigidly fixed to the rim, and the mating surfaces of the wedge strip and inserts in the axial direction are filled with stepped holes with equal faces in height, the radial distance from the axis of rotation of the rotor to these surfaces of the wedge strip and the insert at the steps located above is large compared to the below located steps penny mi. FIG. 1 shows a part of the rotor, about the longitudinal section; in fig. 2 is a view A of FIG. 1. The core of the rotor 1 on the outer ends of the spokes 2 has welded wedge strips 3. Intermediate inserts 4 are located between the rim 5 and the wedge strips 3 and are rigidly fixed on the rim, for example by welding. It is possible to fix inserts on the rim and other well-known methods. The surface 6 of the wedge strip 3 and the surface 7 of the insert 7 which mates with it are made stepwise in the axial direction with a uniform arrangement of steps in height. In this case, there are two evenly spaced treads in the insert and the wedge strip, although a greater number of them are possible. The radial distance from the axis of rotation 8 of the rotor to surfaces 6 and 7 is greater for the steps located above, and the difference in the radial distances between the upper and lower stages is approximately the air gap between the rotor and the stator of the hydrogenerator. If there are several steps, this will be the total difference of the radial distances between adjacent steps. This ensures the removal of the ocTOTia rotor from the rim 5 and its lowering into the rim. As is well known, the air gap between the rotor and the stator of the hydrogenerator, together with the need to ensure the electrical parameters of the hydrogenerator, is selected with the ampli fi cation of the immersion of the rotor into the bore of the stator and is a production-assembly gap. The skeleton of the axial movements relative to the rim is held by a key 9 fixed by fasteners in the groove of the wedge strip 3 of the skeleton and due to the protrusion on the mating surfaces 6 and 7 of the wedge strip 3 and the insert 4. The body and the rim are fixed by wedges 10, driven into vertical grooves on the wedge strips and inserts. At the same time, the gap between the mating surfaces 6 and 7 of the inserts and the wedge strip increases the minimum spacing. When repairing the turbine, it is necessary to remove the core of the rotor 1 from the rim 5. To do this, load the rim, remove the wedge 10, remove the key 9, after which the core of the rotor is removed by the main room crane, and the rim with the pole remains in the hyphogenerator chamber 11. lowering the core of the rotor 1 into the rim 5 at the moment the frame enters the rim between the upper part of the stepped surface of the insert and the lower part of the stepped surface of the wedge strip will be a sufficiently large gap of approximately.

the size of the air gap between the rotor and the stator, provided by the gradation of the surfaces of the insert and the wedge strip. This makes it possible to quickly and safely lower the core into the rim in this case up to half of the rim, then, using the wedge 10, a precise centering of the core relative to the rim and subsequent lowering of the core with a small gap between the wedge strip and inserts are performed. Said core wiring with respect to the rim allows, if necessary, to correct the shape of the rim.

The proposed device, by assembling the rotor core with the rim separately from each other directly in the crater of the unit and dismantling the rotor core separately from the rim, allows for a smaller crane capacity and reduces the size of the machine room, therefore, reduces the cost of building hydropower plants. Mechanical stresses are reduced in the supporting elements of the rim with the skeleton and wedge assembly

the joints of the core with the rim from the wire, reliability is increased and the design is improved.

Claims (1)

A ROTOR OF A VERTICAL HYDROGENERATOR, comprising a rim detachably mounted on wedge strips connected to the core, t and -) characterized in that, in order to increase reliability, intermediate inserts are rigidly fixed on the rim, and the mating surfaces of the wedge strip and axial inserts are made stepped with a uniform arrangement of steps along the height, and the radial distance from the axis of rotation of the rotor to these surfaces of the wedge strip and the insert at the steps located above is greater compared to. lower steps. ^: s SU „„ 1056367 1 1056367