Refrigeration – Automatic control – Refrigeration producer
Patent
1988-06-13
1990-04-10
Tanner, Harry B.
Refrigeration
Automatic control
Refrigeration producer
62278, 62511, 62513, F25B 4700
Patent
active
049149261
ABSTRACT:
This invention is associated with my prior invention of a full flow vaporizer for use in a refrigeration system employing hot gas from the compressor to periodically defrost the cooling coil, or coils where multiple coils are employed. The vaporizer usually consists of three concentric circular cross-section tubes. The inner tube receives the fluid from the coil and is provided in its wall with a plurality of fine bores directing the fluid forcefully radially outwards against the inner wall of the middle tube, which is heated by the hot gas. The flow capacities of the passages and the bores are chosen to be in a specific range of flow capacities relative to one another, so that when not in use the vaporizer has no appreciable effect on the remainder of the system. An orifice or restriction is provided at the outlet for the hot gas from the third annular passage and increases the back-pressure applied to the compressor, rendering the device self-balancing to prevent compressor motor overload. This invention provides a refrigerant vaporizer of different configuration, namely three rectangular chambers having two walls in common. In some apparatus each restrictor is provided downstream with a respective expansion chamber to re-evaporate any liquid that passes through the restrictor and maintain gas flow velocity. In a multiple evaporator system each evaporator is provided with a respective adjustable restrictor to permit equalization of the pressure drops in the individual hot gas lines and consequent equalization of the respective defrost requirements.
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