Electric heating – Heating devices – Combined with container – enclosure – or support for material...
Patent
1982-06-07
1985-02-26
Bartis, A.
Electric heating
Heating devices
Combined with container, enclosure, or support for material...
165156, 165183, 165184, 219306, 219308, 219331, 219499, 219501, 219505, 2221465, 239135, 338 22R, 374185, H05B 102, F24H 110, B05B 124, F28F 136
Patent
active
045019525
ABSTRACT:
A fluid heater, particularly for heating paints, lacquers, varnishes and other spray coating material, includes an elongated hollow tube adapted to be inserted into a fluid flow line for fluid flow through the tube. An electric resistance heater is disposed within the tube and is surrounded by a helical coil member to create a helical fluid flow path through the tube. A temperature control system for regulating the operation of the heater is provided and includes a temperature sensing probe comprising a temperature responsive resistance element enclosed in a conical housing extending into the helical fluid flow path and having its apex contacting the heater and its conical surface area increasing in a direction away from the heater and extending across the cross section of the fluid flow path. The temperature control system is responsive to both the temperature and the rate of change of temperature of the probe and includes an ambient temperature compensation circuit for monitoring the ambient temperature and compensating temperature control circuits for regulating heater temperature as a function of ambient temperature as well as a function of static and dynamic fluid flow conditions in the helical flow path sensed by the probe.
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Bartis A.
Graco Inc.
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