DE1962031U - STEAM TURBINE. - Google Patents

Description

Steam turbine

The innovation concerns turbines of the double-flow design. With such Machines with large shaft diameters result in particularly unfavorable shaft stresses when the steam with a relatively high temperature, e.g. coming from a reheater, in the middle of the relatively long shaft of the blading and touches the shaft.

To reduce the thermal stresses on the shaft in such turbines to reduce, a BauM.se has already been proposed in which within of the turbine inner casing designed for a double-flow arrangement of the blading, a nozzle box is arranged and from this nozzles » box the blading sections of the steam with a temperature * gradient in the nozzles is fed to the corresponding temperature * Continue it is intended to reduce steam through the inner channels of the nozzle box * Gerter temperature of the shaft in a gap between The nozzle box and turbine shaft flows along the shaft and enables the shaft temperature to be reduced.

Such an arrangement, however, requires a relatively complex structural design of the turbine housing, in particular with regard to the arrangement of the nozzle box located within the housing and the steam feeds required for this. It also follows that with such an arrangement in the nozzle box considerable thermal stresses are unavoidable when cooling steam at a lower temperature is passed through channels of the nozzle box ο

15.4.67

Aktz .: S 43 751 / JAc Gm - ^ ZJ

Our reference: PLA 63 / IOO2. Bu / Srn

The subject of the innovation is a much cheaper and simpler one Execution of a turbine, especially a steam turbine, with a double-flow Steam supply and a device to reduce the heat consumption Cracks in the shaft from the supply of cooling steam, in which the propellant from an annular propellant supply channel surrounding the shaft oppositely arranged blading sections of the turbine is supplied.

According to the innovation, this turbine is characterized in that within between the sections of the blading through which there is a double flow arranged, limited by the housing or inner housing steam inflow channel heat-movable an annular, the shaft enclosing steam guide body is present, the at least one the steam inflow channel radially penetrating cooling steam channel 'to a cooling gap between Has shaft and steam guide body and on the housing by the Steam supply channels and arranged in the area of the housing joint Support flange is held and centered, with the appropriate column between the steam guide body and the first rows of guide vanes Blading sections are closed off by resilient sealing strips carried by the steam guide body.

The arrangement according to the requirements has the advantage that it is practically noteworthy Entanglements in the formation of the double-flow turbine housing are avoided and that also by the supply of cooling steam significantly lower temperature due to the heat-movable centered arrangement of the partition wall part no disruptive thermal stresses in the housing can be caused.

- 2 - 15.Ψ.67

File number: S 43 751 / l ^ c

Our mark: PLA

, Bu / Sm

In the following, the innovation will be explained in more detail with reference to Figures 1 and 2 of the drawing, of which Figure 1 is a longitudinal section, Figure 2 shows a cross section through a novelty trained Turbine reproduces in section.

In FIG. 1, the rotor of the double-flow turbine is indicated by 21, which is located within the double-shell housing, consisting of the outer housing 22 and the inner housing 23. 24 and 25 are blades and guide vanes. The steam flows in two flows to the opposite blading sections I and II from the annular channel 2.6 of the inner housing 23. The steam is supplied to the annular channel 26 through the wall of the outer housing 22 or inner housing 23 by means of steam inlet pipes which are located in planes offset from the plane of the drawing and are not indicated in the drawing for the sake of simplicity. It can be seen that without special measures in the intended type of steam supply, the steam supplied to the turbine housing, for example from a secondary superheater, would heat the mile over a considerable length and would have a very unfavorable effect on its strength in the most stressed area.

According to the innovation, the steam guide body 28 which surrounds the shaft with a limited amount of play and allows cooling steam to be guided along the shaft is now provided between the two blading sections I and II within the annular steam inlet duct 2.6 Annular body is formed and has cooling steam supply pipes 29 arranged at two opposite points on the turbine circumference.

- 3 - April 15, 67

Aktz .; S 43 75l / l4c Gm Our mark: PLÄ 63/1002

The steam guide body 28, which is divided into two halves, is heat-movable within the steam feed channel 26 or the inner housing 23 . held and centered. The. Holding and centering takes place here ,, as can be seen in greater detail the cross section of Figure 2, the cooling steam supply lines 29 and the flanges Jl ₃ in the areas of the parting line jià enclosing the Paßbeilagen 33 in the recesses 34a of the heart; housing flanges are supported 34 under Sicherstellung.radialer expansion possibilities through the game 34b, the radial movable "ness of the cooling steam supply pipes ensure 29, are their: pushed introduction tubes 32 of the inner housing 23 35 mean: outer ends" fceleskopartig over the correspondingly shaped ends of ^the.: outer coolant guide _tubes by means of which the steam for cooling the shaft is introduced through the intermediate wall part 28 into the shaft gap 27.

The supplied steam, the temperature of which is below that of the steam fed through the steam inflow channel 26 to the blading sections I and II, is passed through the ring gap 27 between the steam guide body 28 or the shroud 30 (head ring) of the first row of guide vanes and the blading-free shaft section in the gap between ^: the first two rows of guide vanes and rotor blades. In order to keep the propellant flow of the turbine and cooling circuit separate in front of the first row of guide vanes, sealing ring parts 4o of small wall thickness, thickness and high elasticity are wedged into grooves 36 on the end faces of the steam guide body 28, which are in grooves 4l of the head «; rings of the first guide vane rows engage and seal against the

Act.:. S 43 751 / 3Ac Gm

Our reference: PLA 63 / IOO2 GM

Outer walls of the groove 4l are pressed.

The innovation according to the arrangement offers the possibility of relatively simple means in the area of the steam supply to the two blading sections, the shaft against higher temperatures to protect. "Since complications in the housing design are almost completely avoided * the arrangement according to the innovation Realize relatively easy in terms of production.

2 figures

3 claims for protection

~ 5 - 4/15/67

Claims (2)

Γ.Η «L I W J W μ ι«.-'— ι ,, SIEMENS AKGIENGESELLSCHAFT Aktz .; S 43 75l / l4c Gm / Berlin and Munich ... ...... . Our mark: PLA 63/1002 GM protection claims 1. Turbine, in particular Dampfturbine ^ with double-flow steam flow, and a device for reducing the heat requirements of the shaft by cooling steam supply, in which the propellant is supplied from a ring «shaped propellant supply channel surrounding the shaft oppositely arranged blading sections of the turbine, characterized in that within the between the sections of the two-flow blading arranged by the housing or inner casing (22, 23) bounded steam inflow channel (26) is heat-movable, an annular steam guide body (28) surrounding the shaft is present, which has at least one cooling steam channel radially penetrating the steam inflow channel | 29) to a cooling gap (27) between the shaft (21) and the steam guide body (28) and held on the housing (22, 23) by the steam supply channels (35, 29) and in the area of the ^{partial joint (31 a} ) of the housing and supporting flanges (31) is centered, with expedient The gaps between the steam guide body and the first rows of guide vanes of the blading sections (I, II) are closed by resilient sealing strips (40) carried by the steam guide body (28). 2. Turbine according to claim 1, characterized in that the support flanges of the subdivided steam guide body in the area of the partial housing joint (31a) in recesses (34a) of flanges of the turbine inner housing are supported, with between the steam guide body flanges (31) Adapters (33) can be switched on for distancing. - β - 15.4.67 AJctz .: S ² ^ 75l / 14o Gm Fnser "sign: PLÄ 63/1002 . Bu / Sm Turbine according to Claim I _9, characterized in that the resilient sealing rings (HO) are rows between the head rings (30) of the first guide vane and the steam guide body (28) is fastened to the latter in grooves (56) in the end walls by mortising and with their freely moving ends rest against the walls of the grooves (4l) of the head rings (30) of the first rows of guide vanes. «7