DE1926327B2 - STORAGE OF PIVOTING GUIDE SHOVELS - Google Patents

Description

I 926

Gas turbine. In a turbine housing 2, a bearing bush 3 is firmly inserted in a bore about in In the middle of the liner there is a bore 5, which has a further bore 25 in the turbine housing 2 is connected to a cooling air duct 4 of the turbine housing 2 at the end on the flow duct side the bearing bush 3 shows a shoulder 23 so that between the housing bore 21 and the bearing bush 3 At this point an annular space 22 remains free. A radial bore 6 opens through this annular space Wall of the bearing bush 3. In the bearing bush 3 is the The blade shaft 7 of the guide vane 9, which is designed as an adjusting shaft, is supported its blade-side end an annular collar 8 and then an annular groove 18 in the middle area of the blade shaft 7 at the level of the bore S, the blade shaft has an annular groove 16. The annular groove 16 is connected to the annular groove 18 through a helical groove 17. Warehousing of the blade shaft 7 takes place in the bearing bush 3. The blade shaft surface is from the annular groove 16 to the outside designed as a labyrinth seal 20 with a large number of annular grooves.

That coming from an air supplier through one or more channels 15 into the cooling air channel 4 Compressed air flows through the bores 25 and 5 into the annular groove 16. From there, the cooling air reaches the Following pressure gradient inwards and outwards; inward through the helical groove 17, wherein it cools the blade shaft 7 and the bearing bush 3 after emerging from the helical In groove 17, the cooling air reaches the annular groove 18, from where it passes through the outflow opening 6 into the annular space 22 and flows from there into the flow channel 1. A small part of the compressed air comes from the annular groove 16 to the outside through the labyrinth seal 20.

1 sheet of drawings

Claims (2)

the thin walls of the guide vane, which have a patent claim: prevent uniform temperature equalization, the bearing is heated unevenly. 1. Storage of a cooled, pivotable one The task at hand is to create a simple device-guide vane of an axial turbine, with a device that connects the hottest points of the position of the guide vane blade and is designed as an adjustment of the blade shaft of a pivotable guide shaft, which cools in the blade in such a way that, on the one hand, the one bearing bushing of the turbine housing surrounding the flow channel on the outside of the bearing parts is rotatably supported by uneven cooling, and on the other hand that it is simultaneously, whereby the bearing surface of the blade shaft is coordinated cooling of the blade shaft through an annular groove in the middle B? Reich des and bearing bush a small bearing play is interrupted in each loading blade shaft, in which the drive state of the axial turbine is guaranteed
Cooling air via a bore in the bearing bushing. To achieve the object, it can be supplied with a bearing, and between the annular groove of the type specified at the outset according to the invention and the 15 facing away from the flow channel A seal is provided at the end of _{the bearing bush a} ) the bearing surface of the blade shaft between hen is characterized by the grain ring groove and the end of the flow channel Combination of the following features: Bearing bush through erne, from the cooling air a) the bearing surface of the blade shaft (7) is flowed through, helical groove unzwischen annular groove (16) and is interrupted strömungska- ^ao; end of the bearing bush (3) b) the bearing bush at its flow channel side _{by means of a g en} gpde through which the cooling air flows in such a way that an Uneven-shaped groove (17) interrupts an open to the flow channel at this point. chen; the annular space between the bearing bush and the b) the bearing bush (3) is formed at its flow * ⁵ housing bore, in which one, the channel-side end offset in such a way on the outside, radially penetrating wall of the bearing bush that at this point opens a flow opening for the coolant. nal (1) open annular space (22) between ^ ,,., .. »_. 1 _ * jj ο j Bearing bush (3) and housing bore (21). ξ «The advantage of this arrangement is that the is formed, into which one, the wall of the 3 "hottest part of the bearing, the blade shaft itself, bearing bushing radially penetrating drainage is cooled. Since only the hole is covered, the opening (6) for the coolant opens. ** zar storage of the LeH shovel is necessary, is the ^6V ' effort for the KuMungseinnchtung low. 2. Apparatus according to claim 1, characterized in that a further advantage is that denoted by, that the seal between the 35 correct the depth and the pitch of the screw-ring groove (16) and the groove-shaped grooves of the flow channel (1) as well as by controlling those facing away from the cooling At the end of the bearing bush (3), a supply of fluid on the surface of the blade shaft byrinth seal (20), which can be achieved by the same temperature profile in the cylinder, surface of the blade shaft (7) introduced as it occurs on the inner surface of the bearing bush; Annular grooves is formed. 40 thus becomes an optimal one for all areas of operation Bearing clearance achieved. Another advantage is that the coolant flowing into the flow channel the bearing point both against the ingress of ar- fluid from the flow channel blocks, as well 45 prevents the accumulation of disruptive deposits at the bearing point from the flow channel. Finally arise due to the simple The invention relates to the storage of a design with particularly low manufacturing costs,
cooled, pivotable guide vane of an Axialtur- It is indeed the storage of a shaft-shaped bine, with a component connected to the guide vane blade is known (French patent specification nen blade shaft designed as an adjusting shaft, 1 148 829), in which a screw-h'nienförwelcher in a bearing bushing of the channel for a coolant running mig the flow channel surrounding turbine housing is rotatable, but this device only effects the Transgert, whereby the bearing surface of the blade shaft port of the coolant, whereby a heat exchange occurs is interrupted, in which a hole in the 55 this point is actually undesirable because it is a bearing bush Cooling air can be fed in, and in which case the thermal efficiency of the is viewed the annular groove and the steam turbine copied from the flow channel. In the case of the ingenious On the other hand, it is the task of the end of the bearing bush to provide a seal is seen. Coolant when flowing through the helical Such a bearing is made up of the British Pa-60 shaped groove in the bearing surface and the blade shaft tentschrift 1 119774 known. Cool the bearing bush so that the radial bearing In the known storage, no inadmissible values are achieved through a game, neither the heat atrophy of the blade shaft due to unilateral supply from the guide blade to the bearing of the guide cooling, nor by unequal thermal expansion of the blade. However, this bearing cooling is 65 of the blade shaft and bearing bush,
to be carried out only with considerable effort and it also ensures that the drawing is not described in more detail. This shows Bearing play, as a result of the uneven cooling and the cut through a guide vane bearing