附 录
Refrigerated vehicle structure and market potential
With the improvement of living standards of society, lifestyle changes, people need more and more frozen food, fresh food, milk, flowers, and large-scale food processing enterprises. \chain logistics\has become a buzzword transport industry, as low-temperature cold chain logistics is an important part of the key equipment, refrigerated trucks to ensure that perishable, fresh food safety during transport of the key.
So, refrigerated cars and trucks compared to what ordinary special about it? Today small give us a brief introduction it.
Refrigerated trucks from the construction point of view, can generally be divided into the chassis, envelope insulation, refrigeration units of three parts. Chassis:
To be on the highway, the car chassis as the basis, nature is an essential part. Overall refrigerated trucks and trailers are mainly two forms of cycling, mainly to see the need and demand for tonnage of cargo loaded selection.
In the city or county general short distance between the loading of the goods less delivery, more choice in light truck chassis, and engaged in long-distance transport of general traffic is also large, heavy trucks will be used in, or use the form of semi-trailer refrigerated trucks. Select the chassis needs attention?
Users in the selection of car chassis, be based on the tonnage of goods, road conditions, consider the structure of the chassis and carrying capacity, fuel economy, emissions standards.
Compared with selected common truck chassis, refrigerated truck chassis also consider the need to focus on the stability of refrigerated trucks normally transport goods items can not be stored for long periods, although refrigeration equipment still fast delivery. At the same time, refrigerated cargo transport environment more demanding, and if the road failed, causing the deterioration of goods, the loss will be very large. ● refrigerated compartment body options:
Refrigerated trucks envelope different from the ordinary van, it needs to have good sealing performance and heat insulation effect, so as to ensure that refrigerated goods in a stable
temperature environment.
Refrigerated compartment designed primarily tightness and thermal insulation properties, the structure of refrigerated trucks usually three-tier structure, both inside and outside skin of composite materials such as glass, steel, color steel, aluminum and other materials. Transport of goods within the plate material should be different and take a different material, the most expensive within the material is stainless steel plate. Insulation material laminated to the middle, the main use of polyurethane foam. High-strength plastic with four sides of the glass plate bonded together with polyurethane foam to form a closed section. Refrigerated compartment thickness:
In addition to material, cargo compartment also determines the thickness of the insulation effect is good or bad, cargo compartment insulation layer thicker, the better the insulation effect, however, will reduce the space inside the cargo compartment, cargo loading capacity would be reduced, the user needs according to their actual need to select the appropriate thickness.
Refrigerated compartment specific requirements:
In addition, different products have different requirements on the envelope. For example, refrigerated trucks transporting meat need to customize the link on the envelope; to store refrigerated delivery truck to do small quantities, varieties, require multi-temperature refrigerated trucks layer; different temperature requirements, handling and more frequent you need to open the door refrigerated trucks . All these, according to the specific needs of the user can customize the envelope factory. Can an ordinary car into a refrigerated cargo truck?
Many people can not ask an ordinary van into a refrigerated truck, Xiao Bian also asked several tuning of staff who told Xiao Bian, modified, of course it can, in the middle with insulation materials, coupled with refrigeration unit can be installed.
But they believe it is more cost-effective directly into refrigeration compartment, was used as general cargo compartment is made of iron or steel, insulation is not very good, but also easy to rust, such as Lahai fresh products, due to corrosive sea water , need more attention in the choice of anti-corrosion material envelope. ● refrigeration unit:
In the three components of refrigerated trucks, the refrigeration unit is the most important part. Less space because cargo compartment, the temperature control on the technical
requirements are higher. Refrigeration unit principle:
First, let us look at the principles of refrigeration units, refrigeration units currently use refrigerated trucks is more mechanical refrigeration, refrigerators and other refrigeration and air conditioning works essentially the same equipment, at a point on the absorption of heat, and then another point in the heat. This is carried out by two points to reach the refrigerant cycle. Refrigerant through the cargo space of a coil (evaporator) absorbs heat, and then another by the external coil (condenser) heat dissipated. Through a compressor to the refrigerant circulating in the system, compressor gasoline, diesel or motor drive. Refrigeration unit classification:
Refrigeration unit from the power source can be divided into dependent and independent units are two independent units with separate power source, the unit itself independent of the diesel engine as its power source; rather than stand-alone unit power output is to rely on car chassis engine to the driven.
Power output can be seen from their differences, when the car engine stops running when the non-independent refrigeration units support both lost power, cooling system stops working, or if the car is turned off when engine failure occurs in the refrigerator car will stop cooling, the quality of the goods inside are not guaranteed.
Non-stand-alone refrigeration unit system is simple and easy to maintain and repair, and the price is relatively low. Stand-alone refrigeration units because more maintenance and repair of engine systems is slightly more complicated.
The use of terms from the transport, the city or county if it is used as a short-range distribution between the proposed use of non-independent unit, not only lower procurement costs, even failure, is relatively easy to find some service points; the contrary is to conduct long-distance transport is recommended to use separate chillers, because even in long-distance transport in car engines stop working, refrigerators can still be normal cooling to meet the transportation safety items.
Another model from the distribution in terms of seven meters and 7 meters below the recommended use of non-car detached units, 7 meters above the car better with the stand-alone.
From the cost in terms of non-independent stand-alone chillers and refrigeration units in the tens of thousands more than the price difference if the budget is relatively ample, and also
中英文文献翻译—冷藏车的结构及市场潜力
