DE1926327C - Bearing of pivotable guide vanes - Google Patents

Description

Gas turbine. In a turbine housing 2, a bearing bush 3 is firmly inserted in a bore. Around in in the middle of the liner there is a bore S, which can be opened via a further bore 25 in the turbine housing 2 is in communication with a cooling air duct 4 of the turbine housing 2. At the end of the flow channel the bearing bush 3 shows a shoulder 23 so that between the housing bore 21 and the bearing bush 3 an annular space 22 remains free at this point. In this annular space opens a radial bore 6 through the Wall of the bearing bush 3. In the bearing bush 3 is the The blade shaft 7 of the guide blade 9, designed as an adjusting shaft, is supported. The shovel shaft 7 carries on an annular collar 8 at its end on the blade side and then an annular groove 8. In the middle area of the blade shaft 7 at the level of the bore 5, the blade shaft has an annular groove 16. The annular groove 16 stands with the annular groove 18 by a helical Groove 17 in connection. Warehousing of the shovel shaft? 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.

The one 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 flows inwards and outwards following the pressure gradient; inside through the helical groove 17, it cools the blade shaft 7 and the bearing bush 3 After exiting the helical groove 17, the cooling air reaches the annular groove 18, from w <. it flows through the outflow opening 6 into the annular space 27 and from there into the flow channel 1. Em small part of the pressure lure. arrives from the Rmgnui 16 to the outside through the Laby.inth seal 20.

1 sheet of drawings

Claims (2)

1 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 5 direction, which connects the hottest points in the position of the guide vane blade, as an adjustment of the vane shaft of a pivoting arm Guide shaft designed rocker 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 outside bearing parts is rotatably supported by uneven cooling, and on the other hand that is closed by simultaneous, whereby the bearing surface of the blade shaft io coordinated cooling of blade chatter! a small bearing play in each loading blade shaft is interrupted by an annular groove in the middle area of the bearing bush and in which love condition of the axial turbine is guaranteed.
Cooling air via a bore in the bearing bushing. To achieve the object, it can be supplied in a storage facility, and between the annular groove of the type specified at the beginning according to the invention and the 15 facing away from the flow channel, that A seal is provided at the end of the liner _a ) d \ t bearing surface of the blade shaft between hen is characterized by the grain ring groove and the end of the flow channel Bination of the following features: Bearing bush through one, from the cooling air a) the bearing surface of the blade shaft (7) is flowed through, helical groove unzwischen annular groove (16) and strömungska- ^ao is interrupted; end of the bearing bush (3) b) the bearing bush at its flow channel side by a through which the cooling air flows, _gen r £ _nr j _{e is} offset from the outside in such a way that an Helical groove (17) interrupts a flow channel that is open at this point. chen; _the annular space between the bearing bush and Ge b) the bearing bush (3) is formed at its flow ^a5 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; Ring around (22) between. , ... . . . "■ Bearing bush (3) uad housing bore (21) ^The advantage of this arrangement is that the In one, the wall is the hottest part of the storage, the shovel itself. Bearing bushing radially penetrating drain- is cooled directly Since only the parts are cooled Opening (6) for the coolant opens. ^d _A ^ie _f ^{for the} ^ TVS ^Leits ? ^haU i ^{el n0Üg} ? ^{indl 1st of the} Little effort for the cooling system. 2. Apparatus according to claim 1, characterized in that a further advantage is that denoted by, that the seal between the 35 correct depth and the Gangi.che 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, designed as an adjusting shaft, 1 148 829), in which a helical conveyor 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 1 119 774 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 vane to the bearing of the guide cooling, nor by unequal thermal expansion of the vane. However, this bearing cooling is 65 of the blade shaft and bearing bush,
can only be carried out with considerable effort l-nd it also ensures that the drawing is not described in more detail. This shows Lil, because of the uneven cooling and the cut through a guide vane bearing of a