Thermostat with mechanical heat anticipation and droop control

Details Thermostat with mechanical heat anticipation and droop control Thermostat with mechanical heat anticipation and droop control

1990-01-16

1991-03-26

Wayner, William E.

Automatic temperature and humidity regulation

Motors

Electric

236 68B, 337334, G05D 1500

Patent

active

050022261

ABSTRACT:
An electromechanical thermostat for controlling the on/off cycle of a heating/cooling unit. The thermostat has a temperature sensing element with a variable position according to the sensed temperature. Associated with the sensing element is a switch member that provides on/off signals in response to the position of the sensing element. The thermostat has mechanical heat anticipation to control the generation of the on/off signals. In the preferred embodiment the mechanical heat anticipation is accomplished by a stepper motor which varies the position of either the sensing element or switch member to simulate thermal heat anticipation. The thermostat also has a mechanical structure to reduce or eliminate thermostat droop. Preferably this structure includes a control circuit to detect the duty cycle of the heating/cooling unit and mechanically and automatically adjusts the thermostat set point.

REFERENCES:
patent: 2181957 (1939-12-01), Aldworth
patent: 4095741 (1978-06-01), Mott
patent: 4254906 (1981-03-01), Hayes
patent: 4441545 (1984-04-01), Alley et al.
patent: 4489882 (1984-12-01), Rodgers
patent: 4524908 (1985-06-01), Marshall et al.
patent: 4682648 (1987-07-01), Fried
patent: 4734871 (1988-03-01), Tsunoda et al.
patent: 4784319 (1988-11-01), Kaiser

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