System and apparatus for the manufacture of clear ice pieces and

Details System and apparatus for the manufacture of clear ice pieces and System and apparatus for the manufacture of clear ice pieces and

1991-04-02

1992-07-07

Tapolcai, William E.

Refrigeration

Automatic control

By congealed removable product condition

62351, F25C 508

Patent

active

051272369

ABSTRACT:
A coolant circuit, for example of a refrigerator or freezer unit, includes a coolant source at a very low temperature. A finger-type chilling member is thermoconductively connected to the coolant source and is adapted to be positioned within a tank containing water that is flowed to wash around the member. Thereby, the water freezes on the member in the form of a clear ice piece. A heating device is connected to the member to selectively heat the member to detach therefrom the ice piece formed thereon. A thermal barrier is connected to the member at a position to separate the heating device and that portion of the member on which the ice piece is formed from the coolant source. The thermal barrier thus limits cooling of the member by the coolant source and also limits transfer of heat from the heating device to the coolant source. A control circuit includes a regulating circuit to operate the heating device to maintain the temperature of the member at an approximately constant value above a predetermined minimum value necessary to produce clear ice pieces.

REFERENCES:
patent: 2900804 (1959-08-01), Rising
patent: 2954679 (1960-10-01), Blackett
patent: 3287927 (1966-11-01), Jacobus
patent: 3380261 (1968-04-01), Hendrix et al.
patent: 3433030 (1969-03-01), Jacobs
patent: 4199956 (1980-04-01), Lunde
patent: 4366856 (1983-01-01), Yanadori et al.

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