RU2377706C1 - Turbo generator stator - Google Patents

Abstract

FIELD: engines and pumps.

SUBSTANCE: invention relates to electrical and power engineering and can be used at electric power stations in designs of commercially available turbo generators with rigid attachment of the core to stator casing. Proposed stator comprises casing (1) with support lugs (7) and core (2) rigidly fixed there inside. Said support lugs are mounted on flexible elements (11) with the help of distributing plates (8) arranged in recesses (10) of bed (5). Aforesaid distributing plates (5) are attached to bed (5) with the help of spring-loaded anchor pins (12).

EFFECT: reduced vibration of turbo generator and turbine bearings.

6 cl, 3 dwg

Description

The invention relates to the field of electric power, can be used in power plants in the construction of commercially available turbogenerators having a rigid core fastening to the stator housing, and is intended to reduce the vibration level of the bearing supports of the turbogenerator and turbine, as well as their common foundation.

First of all, the supports of the rotors of the turbogenerator and turbine must be protected from vibration, since when the supports exceed the normative limit, the turbogenerator must be stopped.

It is also necessary to protect the soil foundation foundation from vibration, since the transmission of vibration through the foundation to the ground can cause unacceptable precipitation and deformation of the foundation and the associated disturbances in the operation of the turbogenerator.

During the operation of the turbogenerator, in addition to the vibration caused by the imbalance of the rotors and having a frequency equal to the frequency of rotation of the machine, there is vibration created by the force of electromagnetic interaction between the rotor and the stator core, the frequency of which is equal to the product of the rotor speed by the number of its poles.

When the core is rigidly fixed to the stator bearing housing, increased frequency vibration is transmitted from the core to the stator housing, and from it it spreads along the foundation to the bearing supports of the turbogenerator and turbine, as well as to the soil base.

The vibration resulting from rotor imbalance can be reduced to a standard level in a power plant by reducing the driving forces of imbalance by balancing the rotors of the machine in its own supports.

Vibration caused by electromagnetic disturbance depends on the electrical characteristics of the turbogenerator and can be reduced to small values only in the factory by replacing the rigid fastening of the stator core of the turbogenerator to its housing with elastic.

A stator of an electric machine is known, comprising a housing and a core fixed in the housing along the line of support legs and provided with lateral protrusions resting on elastic elements, for example, multilayer rubber shock absorbers (copyright certificate SU No. 426283, Н02К 5/24, 1974).

The disadvantage of this device is the complexity of manufacturing tools to reduce the level of vibration, which is placed inside the housing and can be performed only in the factory.

Also known is a stator of a turbogenerator with a magnetic circuit, the steel packets of which are fixed on a cylindrical frame having an elastic connection with the foundation and the casing, while the frame is connected to the base with support legs located inside the casing, mounted directly on the foundation plate (copyright certificate 8У№135950, Н02К 5 / 24, 1961).

The disadvantage of this device is the location of the elastic support structure inside the casing in a hydrogen atmosphere, which reduces the safety of operation and significantly complicates the repair work.

The closest in technical essence to the claimed solution is a turbine generator stator, including a bearing housing in the form of a base for installing a core connected to the housing by elastic elements in the form of profile beams that are installed between the core structures and the stator bearing housing (patent RU No. 2237337, Н02К 5 / 24, 2004).

The disadvantage of this device is that the absence of an external protective housing and the open placement of the core increases the level of vibration noise generated by the core in the engine room, as well as the likelihood of external damage to the core. At the same time, a large consumption of materials is required for the bearing lower case, which duplicates the foundation.

From the analysis of the prior art it is clear that, as a rule, means to reduce the level of vibration (elastic elements) are located between the outer supporting body and the stator core of the turbogenerator, therefore they are manufactured in the factory as an internal stator element. This complicates the design of the stator.

The technical result of the invention is to reduce the level of vibration of the stator of a turbogenerator having a rigid attachment of the core to the housing, which is achieved directly when the stator is installed in power plants without interfering with its internal factory design.

To achieve the specified technical result in the turbine generator stator, including a housing for installing the core, a core and elastic elements that reduce vibration, according to the proposal, the core is rigidly fixed inside the housing, equipped with support legs installed through distribution plates on elastic elements placed in niches of the foundation to which these distribution boards are drawn by spring-loaded anchor studs below.

In addition, according to the proposal, the elastic elements are made in the form of springs or in the form of blocks of low-modulus materials, for example, polymer or rubber. Distribution plates are also provided with transverse connections to form a common frame, and anchor studs are located between the elastic elements, and the springs on the anchor studs are installed on the side of the lower edge of the foundation. Moreover, its foundation is made common with the turbine and the housing of the bearing supports of the rotors.

The invention can be applied when mounting on the foundation of a new turbogenerator or when performing major repairs. Vibration reduction is achieved while maintaining the factory design of the turbogenerator stator.

It is known that vibration reduction is achieved by placing vibration isolators between the vibration source and the protected structure - elastic or elastic-damper elements (springs of various types, blocks of low-modulus materials, for example rubber or polymer) to significantly reduce the natural frequency of the oscillating system compared to the frequency of the disturbing forces created by the source vibrations. At the same time, a high degree of reduction in the level of vibration of the structure located under the elastic elements is ensured by the selection of the stiffness of these elements.

The claimed technical solution allows to protect not only the foundation from the influence of vibration, but to significantly reduce the transmission of vibration from the stator to the supports of the turbogenerator and turbine rotors, as well as to the foundation foundation foundation.

The essence of the proposal is illustrated by drawings, where Fig. 1 shows a longitudinal section AA of a stator of a turbogenerator together with a turbine and rotor supports and a foundation; figure 2 presents a cross section BB of the stator of the turbogenerator in figure 1; figure 3 presents a cross section bb of the stator of the turbogenerator in figure 1.

It should be noted that for clarity, only those details are presented that are necessary for understanding the essence of the technical solution, and related equipment, well known to specialists in this field, is not shown in the drawings.

The stator of the turbogenerator includes a housing 1 for installing the core 2. The stator, together with the turbine 3 and the housing of the bearing supports of the rotors 4, is installed on a common foundation 5, placed on a soil base 6.

The stator housing 1 is made with support legs 7, which are mounted on the distribution plates 8. The distribution plates 8 in this particular embodiment are provided with transverse connections 9, forming a common frame with them.

The foundation 5 is made with niches 10, in which there are distribution plates 8 mounted on the elastic elements 11.

The distribution plates 8 and the foundation 5 are pulled together by spring-loaded anchor pins 12. The springs 13 are located on the lower edge of the foundation 5 and the anchor pins 12 are located between the elastic elements 11.

The elastic elements 11 can be made in the form of cylindrical or cup springs, as well as in the form of rubber or polymer blocks.

The device operates as follows.

When the stator of the turbogenerator is operating, vibration from the core 2 is transmitted through the support legs 7 of the housing 1 and the distribution plates 8 to the elastic elements 11 located in the niches 10 of the foundation 5.

The elastic elements 11 provide vibration isolation of the housing 1 of the stator of the turbogenerator from the foundation 5. Due to this, there is a multiple reduction in vibration transmitted from the housing 1 to the foundation 5 and along the foundation 5 to the housing of the rotor supports 4 and the soil base 8.

Spring-loaded anchor studs 12 provide the transmission of operational and emergency loads from the housing 1 to the foundation 5, and the presence of springs 13 prevents the propagation of vibration through the studs 12.

Claims (6)

1. The stator of the turbogenerator, comprising a housing for installing the core, a core and elastic elements that reduce vibration, characterized in that the core is rigidly fixed inside the housing, equipped with support legs installed through distribution plates on elastic elements placed in the niches of the foundation to which these distribution slabs are drawn by spring-loaded anchor studs below. 2. The stator of the turbogenerator according to claim 1, characterized in that the elastic elements are made in the form of springs. 3. The stator of the turbogenerator according to claim 1, characterized in that the elastic elements are made in the form of rubber blocks. 4. The stator of the turbogenerator according to claim 1, characterized in that the elastic elements are made in the form of polymer blocks. 5. The stator of the turbogenerator according to claim 1, characterized in that the distribution plates are provided with transverse connections and together with them form a common frame. 6. The stator of the turbogenerator according to claim 1, characterized in that the springs on the anchor studs are installed on the side of the lower edge of the foundation.

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