RU2303324C1 - Electric current generator using open-circuit gas cooling system - Google Patents

Abstract

FIELD: electrical and electromechanical engineering; generators and other cooled electrical machines.

SUBSTANCE: novelty is that proposed electric current generator that has open-circuit gas cooling system, stator frame, rotor, and stator is provided in addition with gas-tight barriers installed within stator frame at stator iron stack ends, gas discharge manifold mounted on outer surface of stator frame, and gas supply manifolds, on its ends.

EFFECT: provision for energy and resource conservation in manufacture and in service, enhanced operating reliability of generator.

2 cl, 2 dwg

Description

The invention relates to power engineering and can be used in the production of electric current generators and other electric machines in need of cooling.

There are known designs of gas-cooled electric current generators, which consist of a rotor, a stator, a stator housing, gas coolers built into the stator housing, and two fans installed inside the stator housing at the ends of the rotor shaft [V. Titov, G. Khutoretsky and other turbogenerators. - L .: Energy, 1967. - S.13-50, 55-56]. In these electric current generators, radial multi-jet and radial exhaust closed circuits of cooling gas are adopted.

The disadvantages of these designs of electric current generators with a closed gas cooling system are inefficient cooling of the fuel elements of their structures (stator core, stator windings and rotor), the need for heat exchangers, gas coolers and pumps for pumping water through them, energy costs for driving fans and pumps, which complicates the design of gas-cooled turbogenerators, makes their operation less reliable and less durable, more complex and expensive.

A known design of an electric current generator with a closed gas cooling system, which consists of a rotor, stator, stator housing, gas coolers built into the stator housing, and fans mounted on the rotor shaft [USSR author's certificate No. 568117, MKI N02K 9/08, publ. 09/12/1977. Bull. No. 29]. At the same time, to increase the cooling efficiency, the stator core, together with the space between it and the stator housing, is divided into an even number of sectors that alternately communicate with the rarefaction and discharge chambers of the fans.

The disadvantages of this design of an electric current generator with a closed gas cooling system are inefficient cooling of the fuel elements of their design (stator core, stator windings and rotor), the need for heat exchangers, gas coolers and pumps for pumping water through them, energy costs for driving fans and pumps, which complicates the design of gas-cooled turbogenerators, makes their operation less reliable and less durable, more complex and expensive.

The closest in technical essence and the achieved result to the claimed is an electric current generator with an open gas cooling system [RF patent No. 2173019, 7 Н02К 9/08, 9/10, publ. 08/27/2001. Bull. No. 24]. It consists of a rotor, a stator, a stator housing, a nozzle grating with Laval nozzles integrated in the stator housing, and a working grating mounted on the rotor shaft.

The disadvantages of the electric current generator with an open gas cooling system - the prototype are the supply of gas cooler from one end of the generator, which leads to a large displacement of the rotor along the axis, the need for a nozzle grill with Laval nozzles and a working grill, which complicates the design of the turbogenerator, makes its operation less reliable and less durable, more complex and expensive.

The technical result of the claimed invention is energy and resource saving in the production and operation of electric current generators with an open gas cooling system, increasing the duration and reliability of their work.

The technical result is achieved by the fact that in an electric current generator with an open gas cooling system consisting of a stator housing, a rotor, a stator, in contrast to the prototype, gas-tight partitions are installed at the ends of the stator steel package at the ends of the stator steel package, between which are placed partitions with openings, a gas exhaust manifold is installed on the outer surface of the stator housing, and gas supply manifolds are installed at its ends.

In addition, fans can also be installed inside the stator housing at the ends of the rotor shaft.

The essence of the device is illustrated by drawings. Figure 1, 2 shows a diagram of the design of electric current generators.

The device of FIG. 1 comprises a stator housing 1, inside of which a rotor 2, a stator 3, gas-tight partitions 4 are located at the ends of the stator steel package, partitions with openings 5, and ring gas supply manifolds 6 and a ring exhaust manifold are installed outside the stator housing 1 gas 7.

The device of FIG. 2 comprises a stator housing 1, inside of which a rotor 2, a stator 3, gas-tight partitions 4 at the ends of the stator steel package, partitions with holes 5 and fans 8 at the ends of the rotor shaft are located, and ring gas supply manifolds 6 are installed outside , gas exhaust manifold 7.

The proposed gas-cooled electric current generator operates as follows. Natural gas entering the gas distribution points of thermal power plants with an overpressure of 1.2 MPa and 0.6 MPa [Roddatis K.F. Boiler installations. - M .: Energia, 1977 - p.155], or air with excess pressure is fed through the annular collectors 6 into the space bounded by the housing of the stator 1 and the gas-tight partitions 4. Then, natural gas or air is cooled by the rotor 2 and the stator 3 and through holes in the partitions 5 they are sent to the annular collector 7.

To intensify the cooling of the frontal part of the stator winding at the ends of the rotor shaft 2, two fans 8 are installed inside the stator housing (Fig. 2).

Then, natural gas or air is supplied under excess pressure to the burners of the boiler furnaces, combustion chambers or to a turboexpander installed between the electric current generator and the burners of the boiler furnaces and combustion chambers.

Thus, the present invention provides energy and resource saving in the production and operation of gas-cooled electric current generators, increasing the reliability and resource of their work, since when using an open cooling system there is no need for gas coolers and no energy is spent on driving pumps to pump water through gas coolers, heat used in the electric current generator is used when introduced into the furnace of the boiler, combustion chamber or when expanding the cooling gas in a turboexpander, and the cooling of the fuel elements of the electric current generator structure is improved.

Claims (2)

1. An electric current generator with an open gas cooling system, consisting of a stator housing, a rotor, a stator, characterized in that gas-tight partitions are installed inside the stator housing at the ends of the stator steel package, between which are placed partitions with openings, on the outer surface of the stator housing a gas exhaust manifold is installed, and gas supply manifolds are installed at its ends. 2. An electric current generator with an open gas cooling system according to claim 1, characterized in that fans are additionally installed inside the stator housing at the ends of the rotor shaft.

Images