Patent RU-2528891-C1 (RU)
Inventor: DIDOV VLADIMIR VIKTOROVICH
IPC: F01D15/08
Filed: 2013-08-08
Granted: 2014-09-20
Abstract: FIELD: engines and pumps. 
     SUBSTANCE: gas turbine engine has cylindrical bush made of nonmagnetic material and fitted on engine shaft. One end of said bush rests against turbine wheel end surface while another end rests against circular ledge of thrust bearing made of nonmagnetic material and fitted on the shaft at section abutting on compressor wheel. Rotor central part comprises aligned shaft and shell ring made of nonmagnetic material jointed together by at least three equally spaced apart equal-depth jumpers made of nonmagnetic material directed radially to rotor lengthwise axis. Rotor and bearing assemblies are fitted inside the spacer of nonmagnetic material with cylindrical case with ends equipped with flanges to be articulated with nozzle diaphragm and compressor diffuser. Note here that shell ring length corresponds to spacer cavity cylindrical part length. Spacer flange side facing the turbine has hole to receive the spinning shaft with bush fitted thereon aligned with spacer lengthwise axis. Besides, this rotor section has the first radial magnetic bearing. For this, said spacer flange is furnished with circular ledge to support composite permanent magnet rigidly secured thereat. Said magnet is composed by at least three permanent magnets. Uneven, extreme magnets are magnetised in rotor axis while even magnets are magnetised radially. Shell ring inner surface has composite permanent magnet including at least three ring permanent magnets. Note here that the quantity, sizes, location and direction of magnetisation of said circular permanent magnets comply with those of permanent magnets secured at spacer flange circular ledge. Housing of second radial magnetic bearing is fitted on cylindrical bush opposite side and on the part of aforesaid circular ledge. For this, it is shaped to disc with hole surrounded by circular ledge facing the rotor centre. Disc surface edges thrust against the surface of ledge composed by first cylindrical recess made at spacer cylindrical end facing the compressor. Disc opposite side has the recess with flat bottom. Note here that composite permanent magnet is rigidly secured o outer surface of said ledge. Said magnet is composed by at least three permanent magnets. Uneven, extreme magnets are magnetised in rotor axis to face by like poles while even magnets are magnetised radially. Composite permanent magnet is rigidly secured at shell ring inner surface facing the compressor. Said magnet is composed by at least three permanent magnets. Note here that the quantity, sizes, location and direction of magnetisation of said circular permanent magnets comply with those of permanent magnets secures at spacer flange circular ledge. Rotor is provided with thrust magnetic bearing including two-side sole and two end thrust bearings. Note here that first end thrust bearings represent disc surface of the second radial magnetic bearing housing provided with ring recess with flat bottom facing the end thrust bearing. Second end thrust bearing made as a disc insert with side facing the end thrust bearing is equipped with circular ledge. Note here that edges of said disc insert thrust against the surface of ledge composed by second cylindrical recess made at the end of first cylindrical recess while its opposite plane faces, with clearance, the compressor wheel. End thrust bearing is composed of a disc locked at rotor shaft and furnished with circular ledges at both sides. Note here that circular recesses with flat bottoms are made at opposite surfaces of the disc. Composite permanent magnets are rigidly fitted at the bottom of the first end thrust bearing second thrust bearing confined by its circular edge. Each of the latter comprises at least three coaxial permanent magnets. Uneven, extreme magnets are magnetised in rotor axis to face by like poles while even magnets are magnetised radially. Besides, composite permanent magnets are rigidly secures at surfaces of circular seats. Each of the latter comprises at least three coaxial permanent magnets. Note here that the quantity, sizes, location and direction of magnetisation of said circular permanent magnets comply with those of permanent magnets secures at spacer flange circular ledge. Magnetic bearing assy arranged on turbine side is made of material with Curie point of at least 900°C. 
     EFFECT: higher load bearing efficiency and reliability, reliable starting at lower temperatures. 
     2 dwg