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Rotor thrust balancing

  • US 4,697,981 A
  • Filed: 12/13/1984
  • Issued: 10/06/1987
  • Est. Priority Date: 12/13/1984
  • Status: Expired due to Term
First Claim
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1. A gas turbine construction in which the air thrust pressures on the rotor are balanced including:

  • a compressor disk having a row of blades thereon,a turbine disk having a row of blades thereon,a shaft connecting said disks and having a conical portion adjacent to the compressor disk and forming, with said disks, the rotor,a first seal carried by said conical portion,a fixed seal cooperating with said first seal,a second seal carried by the turbine disk,a fixed second seal cooperating with said second seal,a bearing for the shaft between the disks,a housing surrounding said bearing,a structure surrounding said housing and defining a compartment extending between the compressor and turbine disks and having as a part of the boundry thereof the conical portion of the shaft radially inward of the first seal and, as another part, the portion of the turbine disk radially inward of the second seal, andmeans for pressurizing the compartment wherein an inner wall of combustion chamber, a support extending from said inner wall to the housing to maintain it in relation to the inner wall and holes in said support to balance the pressure on opposite sides thereof, wherein the first and second seal are at substantially the same radius with respect to the rotor thereby to expose substantially the same area to the pressure in said compartment.

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