RU2237337C2 - Stator of turbine type generator - Google Patents

Abstract

FIELD: manufacture of electric machines, namely of two-pole turbine type generators.

SUBSTANCE: stator of turbine type generator includes core assembled of segments of electrical steel on lengthwise ribs hold in pressed in state by means of pressure washers. Core is joined with carrying housing of stator through elastic members. Carrying housing is in the form of lower body being base for mounting core. The last is provided at least with four cross supporting ribs having lengthwise supporting plates rigidly joined with lengthwise ribs through said cross supporting ribs. Elastic members are in the form of supporting shaped small beams having supporting lands reciprocal to said supporting plates. Elastic members are arranged between supporting plates and lower part of stator housing.

EFFECT: lowered vibration transmitted from core to housing of stator, simplified design of carrying housing of stator.

4 cl, 2 dwg

Description

The invention relates to electrical machines, namely, bipolar turbogenerators containing a fixed stator core and a rotating rotor, and is intended to reduce vibration transmitted from the core to the housing.

In the air gap of such an electric machine during its operation, magnetic forces arise, causing the core to vibrate with a double network frequency.

Vibration of the core is transmitted to the stator housing, in which the core is installed, and then to the foundation. In the event that the bearing bearings on which the rotor rests are mounted on the stator housing, vibration can be transmitted to these bearings, which is undesirable.

To reduce the vibration transmitted from the core to the stator housing of the turbogenerator, elastic fixing of the core in the stator housing is used. A known turbogenerator with elastic fixing of the core in the stator housing, in which the flexible connection of the core and the housing is carried out by making slots in the longitudinal coupling ribs on which the core is assembled and pressed [L.1, p.129, L.2]. The role of the elastic element is performed by the part of the rib located between the slot in the rib and the wall of the housing to which the rib is attached.

The disadvantage of this design is the fact that it can only be used for sufficiently large turbogenerators, since the necessary flexibility is provided with a relatively large core length.

A known stator of a turbogenerator with elastic fixing of the core in the stator housing, in which the connection of the core and the housing is carried out using special plates that provide a flexible connection of the core and the housing [L.1, p. 130], we have chosen for the prototype.

In this design, the core is assembled on tie rods installed in the inner frame. Elastic elements in the form of plates with one end are attached to the outer surface of the inner frame, and the other end of the elastic elements is attached to the inner surface of the outer casing.

The disadvantage of this design is the mandatory presence of an internal frame to which the elastic plates are attached, and the mandatory presence of at least three elastic elements located around the circumference, which requires the creation of a closed (annular) supporting outer case.

The technical result of the claimed invention is to reduce the magnitude of the vibration transmitted from the core to the stator housing, as well as simplifying the design of the supporting stator housing.

The technical result is achieved by the fact that in the stator of the turbogenerator, including a bearing housing for installing the core, a stator core assembled from electrical steel segments on longitudinal ribs held in a pressed state by means of pressure washers and connected to the stator housing by means of elastic elements, the bearing housing made in the form of a lower case as the basis for installing the core, the core is equipped with at least four transverse support ribs with longitudinal support plates, rigidly associated with the longitudinal ribs through the indicated transverse supporting ribs, the elastic elements are made in the form of supporting profile beams with supporting platforms corresponding to the specified supporting plates, and are installed between the supporting plates and the lower part of the stator housing.

The elastic support element may have a section in the form of a channel, an I-beam or a Z-shaped section.

Figure 1 and 2 shows an embodiment with an elastic element in the form of a channel, where

1 - stator core,

2 - a longitudinal rib,

3 - pressure plate

4 - supporting rib,

5 - base plate

6 - the lower housing of the stator,

7 - thrust bearings of the rotor,

8 - elastic supporting element,

9 - boss.

According to the invention, the stator of the turbogenerator comprises a stator core 1 assembled from segments on special longitudinal ribs 2. The core is pressed and held in this position by means of pressure plates 3. To the longitudinal ribs 2 of core 1 are transverse support ribs 4 and support plates 5, at least , 2 on each side of the stator. Thus, the core is a fully assembled assembly, which is mounted on the lower housing of the stator 6 with its base plates, the stator supporting housing consisting only of the lower part. When the generator is operating, the electromagnetic forces arising in the air gap of the machine cause vibration of the core with a frequency equal to twice the rotational speed of the rotor. Through the base plates 5, the vibration is transmitted to the lower housing 6, on which the rotor 7 support bearings can be mounted. As a result, vibration transmitted from the core to the housing is superimposed on the vibration of the bearing bearings caused by the rotor vibration, which is undesirable

The elastic support elements 8 are installed symmetrically on both sides of the core in several places along its length (at least two on one side). The elastic supporting elements are solid beams containing supporting platforms 8A, and 8b and the wall 8g (figure 2). The upper shelf serves to support the core on it through the base plate 5, the lower one - for installation on the housing through the boss 9.

The elasticity of the support element is ensured by the flexibility of the wall 8g connecting the lower and upper bearing pads in the horizontal-transverse direction.

The section of the elastic support element can be made in the form of a channel, an I-beam, have a Z-shaped section or a section of another type, which is determined by the design requirement.

The invention helps to reduce the amount of vibration transmitted from the core to the housing and further to the bearings by installing special elastic support elements 8. between the core 1 and the lower housing 6. In addition, with this design of the elastic elements, the stator support housing consists only of the lower part.

Literature

1. V.V. Titov, G.M. Khutoretsky and others. Turbogenerators. Calculation and design. Energy, L. O., 1967.

2. US Patent No. 2846603, Patented Aug. 5, 1958.

Claims (4)

1. The stator of the turbogenerator, including the bearing housing for installing the core, the stator core, assembled from segments of electrical steel on the longitudinal ribs held in a pressed state by means of pressure washers, and connected to the bearing housing of the stator using elastic elements, characterized in that the bearing housing made in the form of a lower case as a base for installing the core, the core is equipped with at least four transverse support ribs with longitudinal support plates rigidly connected with Aulnay ribs through said transverse supporting ribs, the elastic elements are designed as supporting profiled cross members with the bearing pads, mating said support plates, and support plates arranged between the stator and the bearing housing. 2. The stator according to claim 1, characterized in that the elastic element has a channel cross-section. 3. The stator according to claim 1, characterized in that the elastic element has a cross section of an I-beam. 4. The stator according to claim 1, characterized in that the elastic element has a Z-shaped section.

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