The fresh-keeping cabinet adopts imported compressor, micro-porous air outlet, air-conditioning evenly distributed, the temperature in the standard air-cooled fresh meat cabinet is stable, and the food is not air-dried. The standard air-cooled fresh meat cabinet is made of stainless steel, which is corrosion-resistant, easy to clean, easy to use, and does not pollute food. The whole machine has precise temperature control and double protection of defrosting temperature and defrosting time, thus ensuring the display and preservation effect of the items in the standard air-cooled fresh meat cabinet. In order to achieve good insulation performance, in addition to ensuring the thickness of the insulation layer, the thermal conductivity of the insulation layer is also reduced. Only high-pressure foaming machines with high control precision can meet this requirement. First, the working principle of the fresh cabinet The air-cooled technology freezer does not need to be defrosted, clean and refreshing, and the cold air is forcibly blown into the space of the tank by the air duct, causing circulation and uniform temperature. The automatic defrost humidity of the freezer compartment is low, the refrigeration evenly achieves the effect of precise temperature control, and the foods do not freeze together, greatly reducing the mutual odor. Its shortcoming is that the air-cooling technology is costly and consumes a lot of electricity; the food is easy to dry and dehydrated, and is suitable for use in wet areas. The power consumption is higher than the direct cooling type, and the effective volume is small under the same volume. The air-cooled type has a fast freezing speed, automatic defrosting, food preservation, and uniform temperature; however, it consumes a large amount of electricity, has high noise, and is expensive. Second, the characteristics of the fresh cabinet The compressor of the fresh-keeping cabinet has a small power, so the condenser area, the condenser fan power and the air volume, and the evaporator area, which are matched with the system, are reduced. That is to say, the cooling capacity is small, so the cooling speed is slow. If the refrigerator is used only in winter, spring and autumn, or only in the northern region, it can still cope with the past. On the contrary, due to the high temperature during the daytime and nighttime in the summer, or because of the large amount of food loaded and the large amount of food turnover, the temperature of the fresh-keeping cabinet can not be lowered, and the hygiene and safety of the stored food can not be guaranteed. Third, the application of fresh cabinet The natural convection at low temperature on the surface of the evaporator reduces the temperature inside the tank, but the temperature is not uniform. More energy-saving, the same volume, the effective volume is large. The advantages of direct cooling technology are low manufacturing costs, good freshness and low power consumption, but non-drawer freezers sometimes require manual defrosting. Direct cooling type consumes little power, low noise, low price, and fresh food storage; the thermal insulation performance of the fresh-keeping cabinet is an important quality indicator of the fresh-keeping cabinet, and an important factor in the economical use of the fresh-keeping cabinet. In order to achieve good thermal insulation properties, it is necessary to select the appropriate raw materials to control the bulk density and cell diameter in the optimum range. Therefore, only by adopting the ability to regulate the material temperature, with special fixtures, and mastering the mature foaming process, it is possible to produce a fresh-keeping cabinet with good thermal insulation effect.