Refrigeration – Processes – Assembling – charging – or repairing of refrigeration producer
Patent
1995-07-21
1997-12-09
Sollecito, John M.
Refrigeration
Processes
Assembling, charging, or repairing of refrigeration producer
67149, F25B 4500
Patent
active
056947780
ABSTRACT:
A refrigerant metering charge board that accurately meters a refrigerant and an associated synthetic compressor oil into a product, preferably a refrigerator, is provided. Metering is accomplished by way of servo motors coupled to ball screws which are in turn connected to hydraulic cylinders. Calibration of the refrigerant, preferably R134a, is maintained using a temperature sensor, a programmable logic controller (PLC) and a density/temperature equation that has been empirically fit to saturation data. The preferred equation is a modified Benedict-Webb-Ruben (MBWR) equation of state. The refrigerant charge amounts are entered into the PLC using either a fixed bar code scanner or a hand-held bar code scanner that reads a bar code on the refrigerator. An operator interface, preferably a touch-screen display is also provided. A charging tool to connect to the product for inserting the refrigerant is located in a chargeable automatic connect/disconnect mechanism (ACDM) which allows for automatic operation on a assembly line.
REFERENCES:
patent: 3791165 (1974-02-01), Honnold, Jr. et al.
patent: 5317903 (1994-06-01), McClelland et al.
Davis Mark A.
Roth Thomas J.
Sollecito John M.
Van Winkle Joel M.
Whirlpool Corporation
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