Dual acting defrost system for ice makers and controls therefor

Details Dual acting defrost system for ice makers and controls therefor Dual acting defrost system for ice makers and controls therefor

1975-03-14

1976-11-02

Wayner, William E.

Refrigeration

Automatic control

By congealed removable product condition

62 73, 415 17, 62352, F25C 112

Patent

active

039889033

ABSTRACT:
A reversible cycle ice making machine provided with a tube-in-tube evaporator having disposed between the tubes thereof an annular chamber through which a refrigerant is adapted to flow and bond a hollow ice column upon the inside surface of the inner tube during the freezing cycle; and during the succeeding defrost cycle, to thaw the bond by a dual acting defrost system.
One of the defrost actions of the system is effected by flowing a defrost fluid, such as hot gas, endwise through the annular chamber to cause the refrigerant remaining the chamber from the preceding freezing cycle to be progressively replaced by the defrost fluid while the ice column bond is progressively thawed in the endwise direction. Thus, the length of the chamber containing the defrosting fluid progressively increases as the complementary length containing the remaining refrigerant fluid decreases during the flow of both fluids in tandem and downstream through the chamber.
The other defrost action is effected concurrently with the first action by continuously flowing a second defrost fluid, such as city water, over the outer evaporator tube to elevate the temperature of the complementary refrigerant remaining in the chamber from the preceding freezing cycle and also to elevate the reduced temperature of the first defrost fluid, thereby diminishing the work load of the first defrost fluid to shorten the defrost cycle.
The invention is further characterized by three types of defrost controls especially adapted for use in combination with the dual acting system under specified conditions so as to increase the operating efficiency and further reduce the duration of the defrost cycle.

REFERENCES:
patent: 2592314 (1952-04-01), Morton
patent: 3068660 (1962-12-01), Council et al.
patent: 3164968 (1965-01-01), Mullins, Jr.
patent: 3334651 (1967-08-01), Clearman
patent: 3392540 (1968-07-01), Council et al.
patent: 3791163 (1974-02-01), Dickson et al.

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