Patent Number: 6,283,723

Title: Integrated compressor expander apparatus

Abstract: Fluid displacement apparatus with a set of opposing pistons in traveling chambers and a set of opposing pistons in stationary bores; a second embodiment with all pistons in traveling chambers; a third embodiment with all pistons in stationary bores. In each embodiment the displacement of the pistons can be different and the displacement can be variable. The apparatus is connected to a fuel cell stack to supply compressed gaseous fluid from a portion of the chambers and receive exhaust from the fuel cell stack in other chambers to perform an expander function. The apparatus can also be connected to a fuel cell stack and a reformer to supply compressed gaseous fluid to both and to receive exhaust from both as an expander. The chambers are sized differently to provide a pressure ratio across the fuel cell stack.

Inventors: Milburn; Ski Muir (Boulder, CO), Barber; Jeffrey Lewis (Indian Hills, CO), Cronin; Jeremiah J. (Niwot, CO)

Assignee: Vairex Corporation

International Classification: F04B 35/00 (20060101); F04B 41/00 (20060101); F04B 27/00 (20060101); F04B 001/04 ()

Expiration Date: 09/04/2018