Refrigeration – Gas controller or director – Gas passage over or through indirect heat-transfer container...
Patent
1998-06-24
1999-06-29
Doerrler, William
Refrigeration
Gas controller or director
Gas passage over or through indirect heat-transfer container...
62420, F25D 1706
Patent
active
059162562
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to freight containers intended for the transport of piece goods, and in particular to a freight container for the transport of frozen or refrigerated piece goods. Specifically, the invention relates a novel refrigerating system intended for such freight containers.
In order to maintain the temperature of frozen or refrigerated piece goods during air transport, insulated freight containers having some type of refrigerating equipment are used. Since electrically-driven refrigerating systems consume quite a lot of energy, and since there is a shortage of space inside the airplanes, thus making wiring complicated and making connecting and disconnecting the refrigerating systems troublesome, the use of such systems, for practical reasons, is avoided. There is also a risk of the power supply being disconnected and the refrigerating systems breaking down, in which cases the goods may be damaged or ruined. Further, such compressor-operated refrigerating and freezing systems are relatively heavy and expensive. It is primarily for these reasons, that the use of so-called carbon dioxide ice as refrigerating medium is preferred, the carbon dioxide ice, admittedly, having a limited operating time, which, however, is sufficient for the majority of applications, and under which it must not be exposed to any shutdowns.
The problems related to these freight containers involves obtaining a refrigerating-air flow that permits an even chill distribution around the piece goods in the freight containers, so that the desirable temperature of all of the piece goods therewithin will be maintained, and preventing the occurrence of self-flowing of the refrigerating air at a time when the fans are shut-off. In conventional containers, the guiding of the air streams through the load is performed in such a haphazard way, that the major portion of the refrigerating air in some cases will primarily flow closely along the wall, behind which the refrigerating medium is located. It may also occur, that the refrigerating air flows by itself in a direction, which is contrary to what is desirable, i.e. that the refrigerating air emerges by the floor, collecting thereon. In this case, local temperatures, which are as low as to damage the load, will be found.
Prior structures are provided with the refrigerating system itself, i.e. a box containing carbon dioxide ice, certain flow ducts around this box, and optional fan equipment, placed against a freight container wall adjacent to or directly against the freight container ceiling. In order to achieve an improved loading space, it is desirable to have the refrigerating system placed at a wall adjacent to the freight container floor. In freight containers of the type having a "cut-off" longitudinal corner, i.e. that a wall is broken at the bottom in its transition towards the floor in order to permit the placing of the freight container against an arcuate exterior wall of an airplane, it is desirable to place the refrigerating system in this corner. Such freight containers are conventional per se, regardless of the presence of the refrigerating system. Some advantages in loading would be obtainable, were it was possible to house a refrigerating system against this broken lower portion of the wall.
In freight containers of the type having a top-located refrigerating system, the ice bin, made from sheet metal, is surrounded by an interspace or duct chamber between the ice bin and a surrounding, insulated wall, which then partly is a portion of the freight container wall. In this interspace, the refrigerating air is caused to circulate, the ice bin wall serving as a transmission element between the circulating air and the chill within the ice bin. Carbon dioxide ice is placed in the ice bin through a lid located on the exterior side of the freight container, from which lid a short duct extends into the ice bin. This duct only occupies a relatively small portion of the refrigerating wall surface, across which the refrigerating air flows and, hence, does not substantially
REFERENCES:
patent: 1299175 (1919-04-01), Gruendler
patent: 1396875 (1921-11-01), Pierce
patent: 1948954 (1934-02-01), Weiland
patent: 2098155 (1937-11-01), Minana et al.
Larsson Nils
Westerholm Goran
Doerrler William
Frigotainer Insulated Air Cargo Containers AB
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