Automatic temperature and humidity regulation – Thermostatic – Expanding solid
Patent
1994-10-24
1997-03-25
Tapolcai, William E.
Automatic temperature and humidity regulation
Thermostatic
Expanding solid
236102, G05D 2302
Patent
active
056136340
ABSTRACT:
A passively temperature actuated valve has a shape memory alloy (SMA) mechanism connected to a lever arm which engages the valve stem to actuate the valve against the biasing force of a valve stem biasing spring when the ambient temperature rises above the transition temperature of the SMA. The SMA mechanism can include an SMA rod, but preferably has a tube of shape memory alloy supported in couplings which allow ambient fluid to freely pass through the tube. A stack of Bellville springs concentrically mounted over the tube biases the tribe to the elongated condition when below the transition temperature. An optional latch latches the valve in the actuated position if it is required that the valve remain actuated when the ambient temperature falls below the transition temperature and the Bellville springs again elongate the SMA member.
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Chem Matters, Oct. 1993; vol. 11, No. 3, pp. 3-7.
Raychem Corporation; Thermal Actuation with Shape Memory Alloys, by Dieter Stoeckel; pp. 1-11.
Veronesi Luciano
Wilson Ian L. W.
Tapolcai William E.
Westinghouse Electric Corporation
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