Refrigerant metering charge board

Details Refrigerant metering charge board Refrigerant metering charge board

1997-03-18

1998-07-21

Sollecito, John M.

Refrigeration

Automatic control

Withdrawing or adding refrigerant from or to normally closed...

62292, 62298, 62468, 141 94, 141157, F25B 4500

Patent

active

057821003

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: 2169605 (1939-08-01), Greese
patent: 5031414 (1991-07-01), Walter et al.

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