Refrigeration – Automatic control – Refrigeration producer
Patent
1999-11-08
2000-08-15
Tanner, Harry B.
Refrigeration
Automatic control
Refrigeration producer
62224, 25112921, 318641, F25B 4104
Patent
active
061018279
ABSTRACT:
Temperature comparison circuits which utilize two thermistors which are initially set up in a balanced bridge using NPN transistors and resistors. As temperature differences between the thermistors cause the bridge to become unbalanced, there is a current flow in which the voltage varies in magnitude and direction. The circuits are attached to electrical equipment which is sensitive to changes in magnitude and direction of voltage. The circuits find uses in controlling refrigeration systems, controlling heating and cooling systems, and performing diagnostic tests on mammals or devices which contain temperature differences between two separate points. The circuits may be used in cooperation with an expansion valve which is located in the tubing of a refrigeration system. The tubing is non-magnetic. There is a fixed magnetizable plate having a central orifice. There is a moveable magnetizable plunger having an end which may fit into the central orifice to create a closure of the valve or may be withdrawn from the central orifice to open the valve. The outside of the tube over the plate is wound with a line which is connected to the temperature-sensitive circuit. The outside of the tube over the plunger is wound with a line carrying constant voltage. As the circuit voltage changes in response to temperature differences between the thermistors, the polarity of the fixed plate varies and either attracts or repels the plunger.
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Huff Richard L.
Tanner Harry B.
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