| 摘要 |
A CO2 food freezer has an elongated enclosure through which material to be cooled is carried on an endless porous belt conveyor with an upper operating belt run vertically spaced from the lower return run to provide an intermediate region therebetween. Liquid CO2 injection means is located in an upper region to direct CO2 snow plus cold CO2 vapor downward onto material being conveyed. Blowers aimed at an angle of between about 5 DEG and about 35 DEG upward from the horizontal are located in the intermediate region, and fans in the upper region direct CO2 vapor downward onto material on the belt. The belt includes a plurality of longitudinally spaced transverse rods and a plurality of wire sections that respectively interconnect adjacent rods in pairs. The wire sections are bent so that all segments of wire extending generally between said rods lie in substantially the same plane which constitutes the upper surface of the upper run. The rods effectively deflect cold CO2 vapor from the blowers upward against the undersurface of material being carried along the belt and assure efficient freezing is accomplished.
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