Machine for producing and dispensing liquid or semiliquid foodstuffs
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United States of America Patent
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Dec 13, 2016
Grant Date -
Nov 10, 2011
app pub date -
May 5, 2011
filing date -
May 6, 2010
priority date (Note) -
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status (Latency Note)
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Abstract
A machine for producing and dispensing liquid or semiliquid foodstuffs, includes a heat-adjustment system including a thermal circuit within which a thermal fluid circulates. The thermal circuit includes a compressor, a condenser, an electronic expansion valve, an evaporator, and a control unit configured for determining a main parameter (SH) representative of instantaneous overheating of the thermal fluid coming out of the evaporator. A reference parameter (SHset) is determined as a function of a predetermined value (SHmin), and of an auxiliary value (DT) depending on a variation in time of the temperature (Tout) of the fluid coming out of the evaporator, and of the saturation temperature (Tsat) of the fluid coming out of the evaporator. An electric command signal (S) for the valve is generated as a function of a comparison between the main parameter (SH) and reference parameter (SHset).
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