Patent RU-2592664-C2 (RU)
Inventor: ESKIN IZOLD DAVIDOVICH
IPC: F02C7/06
Filed: 2014-12-09
Granted: 2016-07-27
Abstract: FIELD: engines and pumps, machine building. 
     SUBSTANCE: resilient damping support of rotor heavy turbo-machine relates to GTE of aircraft and ground use, namely to design of elastic damping support of compressor of turbomachine powerful ground use or powerful GTE heavy aircraft, not flying in inverted flight. Proposed elastic damping support of rotor heavy turbo-machine containing housing mounted on the rotor bearing, Sleeve rigidly fixed in the housing and having at the end of inner collar, in which rests on rolling bearing with its external ring, damping gap, in which supply under pressure is supplied oil, sealed at the ends of rubber o-rings, radial-end seal made in form of a cover fixed on the housing, fixed on the rotor and rotating together with it sleeve, the sealing split graphite ring pressed air pressure to the cover and sleeve, labyrinth seal formed by cover and a labyrinth ring secured on the rotor and rotating together with it, spray-type ring with nozzles, through which oil is supplied to the bearing and sealing split joint of graphite ring with sleeve radial end seal. Damping gap between the sleeve is fixed in the housing and outer race, or bushing, tightly fitted on outer ring of bearing (in this case, all these structural elements and actions performed in the external ring of the bearing will be carried out in this bush). Two rubber sealing rings are compacted ends damping gap and end of the gap between the bush fixed in the housing and external ring of bearing located above the nozzle ring, and the third rubber o-ring seals the second end of this gap, and sealing rings are arranged in annular grooves made on outer surface of outer bearing race. Preload in rubber sealing rings and their cross section diameter are selected so that reliable sealing of these gaps and there is no mutual slippage with dry friction rubber sealing rings along contact surfaces of grooves and inner surface of the sleeve secured in the housing at precessing rotor with amplitude of rotor displacement in the support equal damper clearance. Spray-type ring fitted in bore of the external ring of the bearing. Oil is supplied under pressure feed in damper gap of the sealed cavity in the case via circular Groove made in the housing and holes in bushing fixed in the housing, uniformly distributed on a circle, and in the injector ring-from another tight cavity in the case via another annular groove in it, holes in the bush fixed in the housing, also uniformly distributed along the circumference, circular groove made on external surface of outer ring of bearing in the gap above the nozzle ring and holes in the bearing ring arranged in the sector, which occupies groove made in the atomizing ring connects its nozzle. In the damper gap in the external ring of the bearing there is a through orifice. Centering spring is made in the form of elastic annular sector, lower ends are rigidly connected with cover radial end seal. In the external ring of the bearing is a groove under key, a slot for key is made in the centering spring. Resting on bottom of each groove of the key is fitted with interference on its side surfaces, the value of which is selected so that when mounting the rotor support with it sleeve bearing with nozzle ring cover radial end seal with centering spring key, as well as at the turbomachine operation, prevent mutual slip with dry friction side contact surfaces of the key and slots. Height of the key is selected so that at installation of rotor in support and action on centering spring rotor weight force damping gap becoming concentric or to establish concentricity said clearance required force in several tens of n. Centering spring is made with high flexibility, for example, such that at action on the rotor weight force per support it warp by 3÷5 mm. At the other end of the external ring of the bearing has ledge enters the counter slot in the collar Bush fixed in the housing with a gap along the slot perimeter equal to the value of the damper clearance. In this sleeve collar there are three equal in circle through grooves for visual or using a probe concentricity control damper clearance. 
     EFFECT: proposed elastic damping support of rotor is compact and is able to provide high elastic damping characteristics of the powerful turbine machine under conditions of action on the support large static (rotor weight force per support) and dynamic loads. 
     1 cl, 8 dwg