HRP921168A2 - Double wall refrigerating container having foam insulator - Google Patents

Description

This invention relates to a double-walled cooling tank with foam insulation and an inner bottom consisting of a base plate on which "T" struts run longitudinally, the upper flanges of which are arranged so that the spaces between them run longitudinally and which form a loading surface.

The base plate with "T" supports is generally made of, for example, aluminum, as an extruded profile, and individual profiles are welded to the watertight bottom. The chambers that run longitudinally between the bridges of the "T" struts enable an unimpeded return flow of cooling air to the cooling device under the load when the vehicle is loaded. The disadvantage of the already known design in which the base plate is designed as flat is that, on the one hand, impact loads on the flanges, especially those caused by the wheels of the loading vehicle, lead to bending of the bridges if they are not stably designed, and damage can also occur if the connection between the base plate and the insulation does not withstand the load because the strength of the bottom of the tank is greatly reduced.

Starting from the state of the art, the task of this invention is to improve the inner bottom of the cooling tank in such a way that it can withstand stronger impact local loads.

This task is solved in this invention so that the base plate is corrugated, and the crests of the waves are located at the place of the "T" support, and the base plate is connected to the insulation by fastening. The wave shape of the base plate allows the arms of the "T" struts to be very short, and the channels for the passage of air to be large enough. In this way, the resistance to one-sided loads of the outer edges of the flanges is significantly improved. The base plate, designed as waves, with the top of the wave facing the "T" support, strengthens the floor sheet at the points of the beams, and in the case of concentrated local load, it uniformly brings these beams into the insulation, which reduces the risk of critical loading of the connection points between the base plate and the insulation.

The increase in the connection surface with the wavy shape of the base plate and the roundness of the shape achieved with regard to transverse shear loads also increase the safety of the connection.

Interlocks support this effect and are therefore also effective against vertical separation of the base plate from the insulation. With the reduced lateral surfaces of the base plate that form the channels, we achieve the additional advantage that during the cleaning process, the cleaning liquid with residual impurities flows in the clearly visible middle part of the channel, and the outflow speed is, due to the narrowing of the channel bed downwards, even with small amounts of this liquid still large enough, and thus effective in removing impurities. This represents a significant improvement over the previously known bottoms, on whose grooved corners located directly on the leg of the "T" support, various impurities collect.

In the following, we will describe the invention in more detail.

A suitable shape for the top of the wave in cross-section is an isosceles triangle with a "T" strut at its vertex. It is desirable that the arms of that triangle close an approximately right angle. The leg of the angle enters the lower surface of the base plate obliquely, thus reducing the bending height of the bridge "T" of the support, and increasing the bending strength due to the reduced use of material compared to the previously known flat base plates.

This invention is explained in more detail in the attached drawing, which shows a cross-section of the lower left corner of the cooling tank.

The double-walled cooling tank also includes foam insulation 1. The bottom of the tank has a base plate 2 with "T" struts 3 (in cross-section) running longitudinally and whose upper flanges 4 form a loading surface with longitudinal gaps 5. The base plate 2 is corrugated, and the waves are imagined as isosceles triangles with the top angle being approximately a right angle topped by "T" struts. On the base plate 2, fixings (anchors) 7 extend downward into the insulation, which are designed as longitudinal "T" bridges.

The entire corrugated base plate 2 with supports 3, flanges 4 and fasteners 7 is made as an extruded profile, the length of which corresponds to the entire length of the tank, and the width is chosen according to desire and within the scope of production possibilities. Extruded base plates are welded to each other with joints 8. When making the tank, metal parts - base plate 2, outer floor sheet 9, support 10 and outer wall parts 12 are assembled together, pressed and filled with foam.

Claims (4)

1. A double-walled cooling tank with foam insulation, a bottom consisting of a base plate with longitudinal, in cross-section as the letter "T" imaginary supports whose upper flanges form a loading surface with longitudinal intermediate spaces, defined by the fact that the base plate (2 ) corrugated, the crests (6) of the waves are located at the "T" position of the support (3), and the base plate (2) is connected to the insulation (1) with fasteners (anchors) (7). 2. Double-walled cooling tank according to claim 1, defined by the fact that the crests (6) of the waves are conceived as isosceles triangles on the crests of which stand "T" supports (3). 3. A double-walled cooling tank according to claim 2, defined by the fact that the equal arms of the above-mentioned triangle enclose an approximately right angle. 4. A double-walled cooling tank according to one of the above-mentioned requirements, defined by the fact that downward-facing fixings (7) are bridges shaped like the letter "T".