Microturbine power generating system
AssigneeHoneywell Power Systems Inc.
InventorsRobert A. Nims, Joseph Denk, Ramesh Doshi, Terence Emerson
Life of this patent
Estimating the term…
Abstract
A rotating group for a microturbine power generation system includes an electrical generator rotor, a turbine and a compressor intermediate the generator and the turbine. The turbine, compressor and electrical generator rotor are secured together by a tieshaft. The tieshaft is prestressed such that faces of the turbine, electrical generator rotor and compressor maintain contact during high-speed, high-temperature operation of the system.
Claims35
A rotating group for a microturbine power generating system, comprising:
- a turbine wheel receiving expanding gas, the expanding gas causing the turbine wheel to rotate about an axis;
- a rotor having at least one rotor surface and a rotor bore concentric with the axis, at least a portion of said rotor being magnetic, wherein said at least one rotor surface is adapted for rotation within at least one foil journal bearing;
- a single tieshaft having a diameter of less than about one-half inch, the tieshaft being concentric with the axis and extending through the rotor bore, the tieshaft having a yield strength and being preloaded in tension to a predetermined percentage of said yield strength;
- and
- means for maintaining the tension in the tieshaft and securing said rotor and said turbine wheel to rotate in unison with the tieshaft.
A rotating group for a microturbine power generating system, comprising:
- a turbine wheel, a compressor wheel, a rotor, and a single tieshaft, each of said turbine wheel, compressor wheel, rotor, and single tieshaft having a common axis and being secured in fixed relation relative to each other, wherein:
- said rotor includes (a) a rotor bore concentric with the axis, (b) a magnetic portion comprising a two-pole permanent magnet, and (c) at least one rotor surface adapted for rotation within at least one foil journal bearing;
- and
- said single tieshaft extends through the rotor bore.
A rotating group for a microturbine power generating system, comprising:
- a turbine wheel, a compressor wheel, a rotor, and a single tieshaft, each of said turbine wheel, compressor wheel, rotor, and single tieshaft having a common axis and being secured in fixed relation relative to each other, wherein:
- said rotor includes (a) a rotor bore concentric with the axis, and (b) a magnetic portion comprising a two-pole permanent magnet;
- and
- said single tieshaft extends through the rotor bore.
A rotating group for a microturbine power generating system, comprising:
- a turbine wheel receiving expanding gas, the expanding gas causing the turbine wheel to rotate about an axis;
- an impeller wheel having an impeller bore concentric with the axis;
- a rotor having at least one rotor surface and a rotor bore concentric with the axis;
- a single tieshaft being concentric with the axis and extending through the impeller bore and the rotor bore;
- and
- means for maintaining tension in the tieshaft and securing said impeller wheel, said rotor and said turbine wheel to rotate in unison with the tieshaft,
- wherein said impeller wheel has a front side, a back side, and impeller vanes, the impeller vanes being disposed on said impeller wheel front side, wherein said turbine wheel has a front side, a back side, and turbine vanes, the turbine vanes being disposed on said turbine wheel front side, and wherein said impeller wheel back side faces said turbine wheel back side.
Dependencies are inferred from the claim text.