The most important function of a refrigerated truck is to ensure that the temperature of the goods in the vehicle is not invaded by the external high temperature, and that the equipment for ensuring the low temperature in the vehicle is a refrigeration compressor. The classification of the transport vehicle is also diverse.
The displacement type compressor is totally enclosed, and the refrigeration compressor realizes the processes of suction, compression, and exhaustion by changing the volume of the working chamber. Among such compressors are reciprocating compressors and rotary compressors. Speed ​​compressors rely on high-speed rotating T1 for I1" wheels to do work on steam, the pressure is increased, and the task of conveying steam is completed. There are centrifugal and axial compressors which are commonly used in this type of compressor. Centrifugal type is commonly used. Compressor: It has a wide range of applications, mature manufacturing technology, simple structure, low requirements for processing materials and processing, low cost, strong adaptability, and can adapt to a wide range of pressure and cooling capacity, and has strong maintainability. The compressor is a rotary volume compressor, which uses the change of the slot volume and position of the screw to complete the suction, compression and discharge of the steam.The screw compressor is divided into two types: twin screw and single screw. Screw compressors are often referred to as screw compressors.The variable displacement compressor can automatically adjust the power output according to the set temperature.In the whole process of cooling, the compressor is always working, and the adjustment of refrigeration intensity is completely supported by the equipment. It is controlled by a pressure regulating valve inside the compressor, a fixed displacement refrigeration compressor, which cannot automatically change the power transmission according to the demand of refrigeration, but also to the engine fuel consumption. The influence is relatively large, and its control is usually achieved by collecting the temperature signal of the outlet of the evaporator.The constant displacement compressor is also controlled by the pressure of the air conditioning system. When the pressure in the pipeline is too high, the compressor stops working.
At present, domestic refrigerated trucks use double-compressor dual system design method, which is a set of air-conditioning systems, a set of refrigeration systems. However, the compressor dual system is another new design method: only one compressor, one condenser, two evaporators, and associated equipment are needed.
The main function of the edge banding is to seal the cross-section of the board, so as to avoid the damage of the board and the adverse factors (mainly moisture) in the process of use and prevent the formaldehyde inside the board from volatilizing, and at the same time achieve the effect of beautiful decoration.
The product has the following main features: smooth surface, no blistering, no ribbing, moderate gloss, smooth surface and back surface, uniform thickness, uniform width, reasonable hardness, high elasticity, good quality, strong wear resistance, trimmed and sealed The color of the side and the side is close to the surface color, not whitish, good gloss, and the overall color of the finished furniture is coordinated.
Judge good or bad
1. Look at the hue and surface roughness of the edge banding strip. The color of the surface of a good edge banding strip is also very important. Whether the color is close to the customized product and is gorgeous. If the surface is very rough and there are pull marks, the quality is definitely not much better. This is the surface quality of the edge banding strip. It has nothing to do with the quality of the inner material of the edge banding, mainly the production process of the edge banding factory and the production technical skills of the employees. A good edge banding strip is: the surface must be smooth, no blistering or seldom bubbling, no drawing or few drawing, moderate gloss, not too shiny or too matte (unless there are special requirements).
2. Check the flatness of the surface and bottom of the edge banding and whether the thickness is uniform, otherwise it will cause the joint between the edge band and the board, the glue line is too eye-catching or the gap between the board and the edge band is too large, which will affect the overall beauty. Details determine success or failure, and often a small detail problem may bring an embarrassing situation where the overall effect is not good.
3. Whether the edge trimming is whitish, whether the surface of the bent edge strip is severely whitish, and whether the ground color of the trimming strip is close to the surface color of the board in question. PVC Edge Banding strips are mainly made of PVC and Calcium Carbonate plus additives. If the calcium carbonate content is too high, whitening of the edge banding and bending will occur, which proves that the quality of such products is not good.
4. Whether the strength is okay and whether there is elasticity. High strength means good wear resistance, and the corresponding quality is better. Too high strength also means increased processing difficulty. Low elasticity means low wear resistance and low aging resistance. In addition, according to actual production needs, manual trimming is generally required, and soft spots can be made appropriately, and the automatic edge banding machine can make hard points appropriately.
5. Whether the adhesive is applied evenly and whether it is easy to fall off during use.
6. Smell whether the PVC edge banding strips taste or not. Products produced with good quality raw materials generally have a small taste. If the taste is too large, it means that the quality of the raw materials used in production is relatively poor.
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