Refrigeration – Gas controller or director – Gas passage over or through indirect heat-transfer container...
Patent
1998-07-09
2000-01-25
Doerrler, William
Refrigeration
Gas controller or director
Gas passage over or through indirect heat-transfer container...
62420, F25D 1706, B65D 8874
Patent
active
060166649
DESCRIPTION:
BRIEF SUMMARY
Present invention relates to containers for transport of piece goods and specifically to a container for transport of frozen or cooled piece goods. The invention concerns in particular a new arrangement for the distribution of the circulating cooling air in such containers.
In order to maintain the temperature of frozen or refrigerated piece goods during especially air transport, heat insulated containers having some type of refrigerating unit or similar equipment are used. By practical reasons, so-called carbon dioxide ice is preferably used as refrigerating medium, which certainly has a limited, but for the majority of applications sufficient operating time and during this time it cannot be subject to any shutdowns.
The refrigerating unit in such containers may be positioned all the way from floor level up to ceiling level. Irrespective the positioning, the ice reservoir is surrounded by a spacing or a channel space between the same and a surrounding insulated wall, part of which then is constituted by the container wall. In this spacing, the refrigerating air is allowed to circulate, where the ice reservoir wall, normally made by sheet-metal, acts as transfer element for the cold between the circulating air and the cold in the ice reservoir. Carbon dioxide ice is placed in the ice reservoir through a door, found on the outside of the container and from which a short channel extends into the ice reservoir.
One problem with these refrigerating containers is to achieve such a flow of the refrigerating air in those, that an even distribution of the cold is achieved around the piece goods in the containers, in order to maintain the requested temperature for all piece goods. The control of the air flows through the cargo in conventional containers occurs quite randomly, which results in that the major part of the refrigerating air flows close to especially that wall, at which the ice reservoir is positioned. A request is to get the refrigerating air to flow between all walls and the cargo in an as evenly distributed condition as possible. In such a way the cargo is wrapped in a refrigerating air shell, which results in maintaining its cold. Thus, it is not necessary for the refrigerating air to flow between the different packages, constituting the piece goods, but the important thing is that no heat radiation or heat transfer to these exist. As mentioned, this is achieved by applying a wrapping around the whole cargo in the container, which has the same or a lower temperature than the goods.
The present invention aims to remove above mentioned problem and to fulfil the mentioned request. This is achieved by an arrangement according to the claims, from which also the characteristic features of the invention are evident.
The invention is described more in detail in the following in connection with the attached drawings, of which
FIG. 1 is a projection view of a refrigerating container formed by an arrangement according to the invention,
FIG. 2 is an exploded sketch of the arrangement according to the invention for controlling of the refrigerating air in a container,
FIG. 3 is a phantom view of the container in FIG. 1, and
FIG. 4 is a central, schematic longitudinal section through the container in FIG. 1 and 3 with the flow paths of the refrigerating air indicated by arrows.
In FIG. 1 is an embodiment of a container 1 shown, which has a general conventional form and in principle is constituted by a well insulated, parallelepipedial case with a ceiling 2, a pair of side walls 3, 4, a pair of end walls 5, 6, and a bottom 7. One of the end walls 6 consists by a pair of doors or openings, through which the cargo, usually piece goods, can be entered into or removed from the container 1. In one of the side walls 3 at the end wall 5 a cabinet 8 with an opening exists, in which the equipment for circulating of the refrigerating air is situated. There is among other things the battery unit, which delivers current to circulation fans 9 for the refrigerating air, and to the not shown thermostat arrangement, which monitors
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patent: 3246592 (1966-04-01), Rath
patent: 3386260 (1968-06-01), Kirkpatrick
Larsson Nils
Westerholm Goran
Doerrler William
Frigotainer Insulated Air Cargo Containers AB
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