ROTARY BLADED STRUCTURE FOR A FLUID FLOW MACHINE

• US 3,706,509 A
• Filed: 01/15/1971
• Issued: 12/19/1972
• Est. Priority Date: 01/20/1970
• Status: Expired due to Term

• Current Assignee: Jack Britt
• Original Assignee: Jack Britt
• Inventors: Britt, Jack
• Primary Examiner(s): Raduazo, Henry F.
• Application Number:
  US05/106,813
• Time in Patent Office: 704 Days
• Field of Search: 415/199,219,130,131,214,172 416/198,199,201,241,198A
• US Class Current: 415/131
• CPC Class Codes: F01D 5/06 Rotors for more than one axial stage, e.g. of drum or multiple disc type; Details thereof, e.g. shafts, shaft connections F01D5/022, F01D5/023 take precedence

Abstract

A rotary bladed structure for a fluid flow machine comprising adjacent coaxial bladed rotors arranged for rotation together, a helical torque-transmitting connection connecting said bladed rotors together and permitting limited axial and angular relative movement of said rotors, and loading means for loading said connection against said relative movement by applying opposing torques to the adjacent rotors about the axis of rotation thereof.

Claims

1. A fluid flow machine comprising a rotary bladed structure including adjacent co-axial bladed rotors for rotation together, a helical torque-transmitting connection connecting said adjacent bladed rotors together and permitting limited axial and angular relative movement of said rotors, and loading means for preloading said helical torque-transmitting connection against said relative movement, said loading means including means to apply opposing torques to said adjacent bladed rotors about the axis of rotation thereof.

2. A fluid flow machine as claimed in claim 1 wherein the helical connection comprises helical splines.

3. A fluid flow machine as claimed in claim 1 wherein the loading means comprises a pre-loaded torque tube.

4. A fluid flow machine as claimed in claim 1 wherein a splined connection transmits a said opposing torque applied by said loading means to at least one of said adjacent rotors.

5. A fluid flow machine as claimed in claim 1 wherein a row of stator blades is interposed between the adjacent bladed rotors, an axially extending flange being provided on one of said rotors, part of said helical connection and a fluid sealing device being carried by said flange, and a shroud ring being provided at the radially inner ends of the stator blades, the said sealing device sealingly cooperating with the shroud ring.

6. A fluid flow machine as claimed in claim 1 wherein the adjacent bladed rotors are of different materials.

7. A fluid flow machine as claimed in claim 1 wherein said helical torque-transmitting connection has a hand to assist action of said preloading means along with fluid forces acting on said bladed structure duriNg steady operation.