Patent ID: 6012642
Filing Date: 2000-01-11
Classification: F24F,G05D

Abstract:
A drive mechanism for controlling a fluid flow, comprising a thermally separating wall (14, 14'), a first temperature responsive expansion drive (1) positioned for exposure to a first temperature on one side of said thermally separating wall, a second temperature responsive expansion drive (1') positioned for exposure to a second temperature on the other side of said thermally separating wall, a flow control (22, 34), a driving force transmitter (3, 33) connected to said flow control, a first elastic, compressible coupling (2) connecting said driving force transmitter (3, 33) to said first expansion drive (1) for applying a first force from said first expansion drive (1) through said first elastic compressible coupling (2) to said driving force transmitter (3, 33), and a second elastic, compressible coupling (2') connecting said driving force transmitter (3, 33) to said second expansion drive (1') for applying a second force from said second expansion drive (1') through said second elastic compressible coupling (2') to said driving force transmitter (3, 33) so that said flow control is operable simultaneously in response to said first and second expansion drives by a difference force corresponding to a temperature difference between said first and second temperatures.