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[0001] The present invention relates to a floor plate for a cooling container of a sandwich construction and provided with cooling passages formed by a T grating (a grating composed of T-section members) which is closed by an upper cover plate and wherein a rigid foam is provided as an insulation between the upper and lower cover plates.
[0002] Floor structures for containers which are provided with cooling passages are described, for example, in DE 44 33 728A and DE 597 02 926.
[0003] Such floor structures are widely used in cooling containers which are used to ship freight which must be cooled or at least prevented from excess heating. They are largely successful because they can take substantial loads and have excellent insulating properties. The insulation is primarily the rigid foam mentioned previously.
[0004] However, rigid insulating foams must comply with environmental standards, especially with respect to the use of fluorinated-chlorinated hydrocarbons. Since rigid foams have been developed, the use of fluorinated-chlorinated hydrocarbons as foaming agents for polyurethanes have been banned and products which contain such foams are increasingly being eliminated from commerce the use of fluorinated-chlorinated hydrocarbons containing foaming agents has the additional drawback that the foams which are produced are more limited in effectiveness than more recently developed commercial foams. The increased thickness which is required for the less efficient foams results in a reduction of the container volume and cooling containers with the prior foams for that disadvantage.
[0005] An especially critical point with respect to the insulation is the so-called gooseneck tunnel in which the insulating layer can only have about {fraction (1/5)} of the main layer thickness for the remaining regions of the floor plate. The insulating action of the foam utilized in this region is an order of magnitude less than what is generally deemed to be necessary and hence effective insulation in the gooseneck tunnel region is a significant problem.
[0006] It is, therefore, the principal object of the present invention to provide a floor plate for a cooling container, especially of the type in which the floor plate is provided with passages is a cooling medium, in which the gooseneck tunnel has substantially the same insulating effect as other regions of the floor plate.
[0007] Another object of the invention is to improve the insulating effectiveness of floor plates for cooling containers so that the aforementioned drawback is avoided.
[0008] These objects and others which will be apparent hereinafter are attained, in accordance with the invention by providing the region of the gooseneck tunnel as a vacuum insulated plate.
[0009] By providing one or more vacuum insulated plates if the insulation of the floor of the cooling container, at least in the region of the gooseneck tunnel, is significantly lower thermal transfer characteristics of the vacuum insulated plate, by comparison with rigid foams, can be utilized to increase the insulating character of the gooseneck tunnel structure so that, in the region of the gooseneck tunnel, the insulation effect is at least equal to that of the floor plate elsewhere. The vacuum maintained in the plate or plates delimiting the gooseneck tunnel, of course, accounts for the enhanced insulating effect.
[0010] As a consequence, despite the significantly reduced layer thickness of the insulation in the gooseneck tunnel region an insulating effect can be obtained which is equivalent to the full insulating effect elsewhere on the floor plate even in the critical region of the gooseneck tunnel.
[0011] The above and other objects, features, and advantages will become more readily apparent from the following description, reference being made to the accompanying drawing in which:
[0012]
[0013]
[0014]
[0015]
[0016] The floor plate
[0017] The vacuum insulated plate
[0018]