The skeleton of the refrigerated truck must have thermal insulation and load-bearing capacity. The skeleton for the purpose of load-bearing is the main skeleton, and steel, aluminum profile or sheet stamping parts with higher strength and rigidity are mostly used; the skeleton for the purpose of thermal insulation is the auxiliary skeleton, the so-called "thermal bridge", which is often used Non-metallic materials such as wood, plywood, engineering plastics, and fiberglass can be installed on the outside, inside or in the middle. The main skeleton is mostly connected with the outer skin, and the auxiliary skeleton is connected with the inner skin, forming a space filled with insulation materials between them. The main skeleton and the auxiliary skeleton are fixedly connected to complete all the functions of the skeleton together. The carriage wall frame has various shapes such as Z-shape, U-shape and H-shape. The inner and outer skins are flat and corrugated, and the materials used are steel plate, aluminum alloy plate, stainless steel plate, glass fiber reinforced plastic (reinforced glass fiber plastic) plate, etc., and the connection with the framework is mostly riveting and pulling riveting (one-way expansion riveting).
In order to improve the thermal insulation performance of the car body, it is necessary to minimize the contact heat transfer area between the inner stiffeners of the wall structure and the inner and outer panels and to avoid the formation of thermal bridges between the stiffeners. Therefore, some domestic enterprises have explored some new siding structures.
However, because the manufacturing process of the rib structure is more complicated, and the heat insulation material is likely to form a hollow inside or at the corners of the "several"-shaped rib during the foaming process, which affects the heat conduction performance of the entire car, so it is not in actual use. common.
The inner and outer skins of the insulated compartment often contain low thermal resistance materials, and the heat flow zone formed by these materials will form a thermal bridge. Although the area of the thermal bridge only occupies 2%-5% of the insulated compartment, it has a greater impact on the heat transfer coefficient, which can be increased by 10%-25%. Therefore, a thermal break bridge needs to be added between the compartment skins to improve the thermal insulation performance of the compartment. In terms of technical treatment, corrugated, corrugated or semi-circular strip ribs can be used on the left and right side walls and the front wall, which can improve the strength and rigidity of the compartment wall and make the appearance beautiful. At the same time, the reasonable corrugated shape of the inner skin can also divert the air inside the car body and strengthen the reasonable circulation of the inner gas. The outer skin often uses a lighter color, which can increase the solar reflectance and reduce the thermal conductivity of the whole truck .
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Charles Soon
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