Thermopneumatic actuator

Details Thermopneumatic actuator Thermopneumatic actuator

1977-10-19

1979-01-16

Wayner, William E.

Automatic temperature and humidity regulation

Mixing fluid of dissimilar temperature

Plenum type

236 87, 236 91F, B60H 102

Patent

active

041345428

ABSTRACT:
An output member of the present actuator is connected to control a temperature door in an air conditioning duct leading into an automobile passenger compartment and thereby the temperature in the compartment. The output member is connected to and moved by a diaphragm which is positioned by opposing forces of a diaphragm spring and modulated intake manifold vacuum. A valve is controlled by first and second bimetal springs which act in parallel against a feedback spring connected between the valve and the diaphragm. The first bimetal spring is responsive to air temperature in the compartment. The second bimetal spring is responsive to air temperature in the duct and compensates for variations in the operation of the air conditioning system caused by variations in load and the like.

REFERENCES:
patent: 3727837 (1973-04-01), Gazzera et al.
patent: 3770195 (1973-11-01), Franz
patent: 3877638 (1975-04-01), Amano et al.

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