Turbine assembly with auxiliary wheel

Patent metadata

Field	Value
Publication number	US-2018320544-A1
Application number	US-201715587314-A
Country	US
Kind code	A1
Filing date	May 4, 2017
Priority date	May 4, 2017
Publication date	Nov 8, 2018
Grant date	—

Abstract

Various embodiments of the present application provide one or more of: (1) auxiliary wheel that (a) enables accurate speed detection of a turbine disc and/or (b) presents a machining surface for balance correction; and/or (2) techniques for mounting an auxiliary wheel to a rotor, such as a turbine disc.

First claim

We claim:

1 . A turbomachine having a non-magnetic turbine disc carried by a rotating shaft and a system for detecting an overspeed condition of the disc using a magnetic probe positioned in proximity to a magnetic target carried past the probe during rotation of the shaft, the system comprising an annular spanner nut threadably mounted on the disc for axially engaging a turbine disc coverplate, said spanner nut comprising a speed sensor target having a plurality of teeth spaced about the circumference thereof.

2 . The turbomachine of claim 1 , wherein said annular spanner nut further comprises a balance land having an annular machineable surface.

3 . A turbomachine having a turbine disc carried by a rotating shaft and a system for balancing the turbine disc having a machineable surface positioned about a circumference of the disc, said system comprising an annular spanner nut threadably mounted on the disc for axially engaging a turbine disc coverplate, said spanner nut comprising a balance land having an annular machineable surface.

4 . The turbomachine of claim 3 , wherein said annular spanner nut further comprises a speed sensor target having a plurality of teeth spaced about the circumference thereof.

5 . A turbine rotor assembly comprising:
a turbine disc carried by a rotating shaft; a coverplate carried by said turbine disc; an annular spanner nut threadably mounted to said turbine disc and axially engaging said coverplate, said spanner nut comprising a speed sensor target having a plurality of teeth spaced about the circumference thereof; and a magnetic probe positioned proximate the speed sensor target so that rotation of the shaft carries the plurality of teeth past the probe, said probe being configured to detect the speed of the teeth passing the probe.

6 . The turbine rotor assembly of claim 5 , wherein said spanner nut further comprises a balance land having an annular machineable surface.

7 . The turbine rotor assembly of claim 5 , wherein the balance land is positioned axially intermediate of a threaded portion of said spanner nut and the speed sensor target.

8 . A turbine rotor assembly comprising:
a turbine disc carried by a rotating shaft; a coverplate carried by said turbine disc; an annular spanner nut threadably mounted to said turbine disc and axially engaging said coverplate, said spanner nut comprising at least one of a speed sensor target having a plurality of teeth spaced about the circumference thereof or a balance land having an annular machineable surface.

9 . The turbine rotor assembly of claim 8 , wherein said spanner nut comprises a speed sensor target having a plurality of teeth spaced about the circumference thereof and a balance land having an annular machineable surface.

10 . The turbine rotor assembly of claim 9 , wherein said turbine disc is non-magnetic and said speed sensor target is magnetic.

11 . The turbine rotor assembly of claim 9 , wherein said balance land is positioned axially between a portion engaging said coverplate and said speed sensor target.

12 . The turbine rotor assembly of claim 9 , wherein said annular machineable surface faces radially outward.

13 . The turbine rotor assembly of claim 9 , wherein said plurality of teeth extend radially outward.

Assignees

• Rolls Royce Corp

Inventors

• Snyder Brandon R
• Whitten Michael R
• Sellhorn James E
• Riehle Bradford John

Classifications

• F01D21/003 Primary

  Arrangements for testing or measuring (for measuring vibrations G01H) · CPC title

• F05D2220/32

  in gas turbines · CPC title

• G01P3/44

  for measuring angular speed (G01P3/56 takes precedence) · CPC title

• F05D2240/24

  for turbines · CPC title

• F01D5/027

  Arrangements for balancing (for balancing rotating bodies in general F16F15/32; for compensating imbalance G01M1/36) · CPC title