A refrigerated vehicle refers to a specialized vehicle equipped with an insulated structure and a refrigeration device for refrigerated transportation; Insulated vehicle refers to a specialized vehicle equipped with an insulated structure for short distance insulation transportation. The insulated carriage is the main component of refrigerated and insulated vehicles. As a car style cold storage, it has both the commonality of a conventional box car compartment and superior thermal insulation performance.
The main techniques for making the compartment of a refrigerated and insulated vehicle include: (1) sandwich panel bonding for segmented assembly, (2) foam injection for the overall skeleton, and (3) foam injection for segmented assembly. The larger production enterprises of refrigerated vehicle insulation vehicles in China now accept sandwich panel bonding with segmented assembly. These enterprises produce a wide variety of refrigerated vehicle insulation vehicles, with large batches and reliable quality, representing the level of craftsmanship in the growth of refrigerated vehicle insulation vehicles in China and occupying a large market share in most domestic markets; The production scale of manufacturers who accept the injection of foam into the overall skeleton to make car bodies is relatively small, but they are flexible and naive, and can produce various non-standard vehicle car bodies. There are many such manufacturers now, occupying a place in the domestic refrigerated and insulated vehicle market. The various sections of the insulation compartment of the more advanced
Refrigerated Truck are bonded with structural adhesive, wrapped with aluminum profiles, and supported by bolts. The rear door is double leaf, each leaf can open 270 °; Sealing strips bonded to the door can prevent cracks and improve insulation performance. The rear door frame and hardware are made of stainless steel material, which is elegant and elegant. The upper and lower protective plates are made of aluminum profiles and glued to the body of the car. The heat insulation materials commonly used in refrigerated car heat preservation vehicles mainly include polystyrene foam, polyurethane foam and extruded polystyrene foam.
(1) Polystyrene foam. It is a microporous honeycomb structure foam material obtained by heating pre foaming expandable polystyrene particles containing low boiling point liquid foaming agent in the mold. Only the bonding process can be accepted to form the insulation layer for the carriage. Popular polystyrene foam is used as the thermal insulation material for refrigerator cars, and has been carved out in western countries; But due to its low cost, individual small factories in China are still using it. The thickness of the insulation layer of the refrigerated car is determined by the usage requirements of the carriage and the selected insulation materials. If polyurethane foam is used, its thickness is 50-120mm for refrigerated vehicles; For insulated vehicles, their thickness is 30 ^ -100mm. If polystyrene foam is selected, its thickness is usually 20% more than polyurethane foam. (2) Polyurethane foam. It is currently the most widely used excellent insulation material. Its main physical and mechanical properties are: thermal conductivity of 0.03W/(m&bu11; K), tensile strength of 2.5GPa, compressive strength of 2.OGPa, adhesive force with steel plate of 2.9GPa, adhesive force with plywood of 1.4GPa. The main factors affecting the thermal conductivity of polyurethane insulation material are foam density, bubble diameter, bubble self force rate, humidity and temperature. The polyurethane foam is made of isocyanate and combined polyether in a ratio of 1:1. It can accept filling, pouring, spraying, bonding and other processes to form a car insulation layer. Due to its low heat transfer coefficient, good insulation performance, high strength, and good processability, it is suitable for injection molding
