Heat exchange – Regenerator – Checker brick structure
Patent
1992-11-05
1994-06-14
Ford, John K.
Heat exchange
Regenerator
Checker brick structure
165 26, 165 27, 236 1C, 62 362, 62 361, 62 37, 337338, 337337, 337340, 337363, 337364, 337342, 337349, F25B 2900
Patent
active
053201620
ABSTRACT:
A thermostat is disclosed having a bimetallic strip actuating a single pole, double throw switch, one throw to sense temperatures below the lower limit of a set point range and the other throw to sense temperatures above the upper limit of the set point range. In typical applications one throw for actuating heating and the other throw for actuating cooling. The bimetallic strip is provided with typically a cantilever support at one end and extends between dimensional spaced double throw contacts at the opposite end. Spacing of the contacts determines magnitude of the set point range. An intermediate beam type support is provided between the cantilever support and double throw contacts. This beam support consists of an adjustment screw acting on one side of the bimetallic strip and a spring directly opposing the adjustment screw. The adjustment screw moves the bimetallic strip relative to the contacts for operating excursion of the thermostat thus positioning the mid-point of the set point range between subfreezing and incubation temperature ranges. The spring is selected to act with respect to the adjustment screw to both bias the strip against the adjustment screw as well as provide a non linear vibrational damping to the bimetallic strip. Circuitry is disclosed for passing minimal current through the mechanical portions and amplifying and driving a heater or cooler, preferably electrical heaters and coolers. There results a thermostat which cannot thermally lockup, is resistant to vibration, and can be adjusted to narrow band operation over a wide range to temperatures.
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