Alliedsignal Inc.

Ronald E Crabtree

Marshall Patton Saville

Michel A Jonqueres

Terry L Morris

Stanley C Pollitt

Peter C Collins

Roger R Sanger

Terrence P Emerson

Michael E Carter

Raymond Rapozo

Thomas J Kazan

Arturo Moreno

A two-spool air cycle machine includes a high pressure cooling turbine section; a low pressure cooling turbine section; and first and second shafts that are concentrically arranged and that are independently rotatable with respect to one another. A turbine wheel of the high pressure turbine section is secured to the first shaft, and a turbine wheel of the second turbine section is secured to the second shaft. Such an air cycle machine may be used a variety of different aircraft environmental control systems.

Two spool air cycle machine having concentric shafts

An environmental control system includes a single heat exchanger, a single water separator and two air cycle machines on separate spools. Cooling turbines of the air cycle machines are cascaded. Air flows through both air cycle machines during normal operation of the environmental control system. If one of the air cycle machines fails, air can be bypassed around the failed air cycle machine. Cascading allows water separation to be performed by a mid-pressure water separator located between the air cycle machines.

Single package cascaded turbine environmental control system

Growing community of inventors

Sun Lakes, AZ, United States of America

Ronald E Crabtree