Truck air conditioning refrigerating system consists of a compressor, condenser, receiver drier, expansion valve, evaporator and the blower and other components. Between parts of the copper tube (or tubes) and high pressure rubber pipe connected to a closed system. Refrigeration system working, refrigerant circulating within the different States in this closed system, each cycle has four basic processes: 1 compression: compressor suction low temperature and low pressure at the outlet of evaporator of refrigerant gases, compress it into a high temperature and high pressure gas compressor. 2, thermal processes: high temperature and high pressure of the superheated refrigerant gas into the condenser, due to the pressure and temperature of refrigerant gas condenses to liquid, and emit a lot of heat. 3, throttling processes: higher temperatures and pressures of the refrigerant liquid through the expansion device becomes larger in volume, pressure and temperature fell sharply, with mist (small droplets) exhaust expansion devices. 4, endothermic process: spray liquid refrigerant into the evaporator, refrigerant boiling point when so far below the evaporator temperature, the liquid refrigerant evaporates into a gas. During the process of evaporation absorbs heat around, then low temperature and low pressure refrigerant vapor into the compressor. Repeated the above process, achieve the goal of reducing the air temperature around the evaporator.
Domestic truck air conditioning has been developing over the years, but the overall design and manufacture level lower than foreign. The development of domestic truck air conditioning in the late 80 early 90 supporting enterprises for which representation, Shanghai wanzhong bus air conditioning air conditioner factory, now known as air international (Shanghai) Ltd, the production of Santana car of Shanghai Delphi truck air conditioning systems Ltd, production of car air conditioners in Changchun Faw-Jack game air conditioning Co. In recent years with management information systems of gradually universal, domestic manufacturers began attempts to points batch to introduction for enterprise development of information management system, as Shanghai de, Fu car air conditioning system limited introduction of products data management system IPM/PDM, unified management products design information and process information, formed engineering information database, and ERP system of management information database through computer network for effective of information exchange and resources shared, eventually meet company CIMS of general planning standard, Realization of the company’s information. However, the domestic truck air conditioning industry starts late, scattered, chaotic, and poor structure. Lack of sufficient design car air conditioner manufacturers and technology used. Several major domestic air-conditioning plant is still at a stage of imitation foreign air-conditioning system. Design software while introducing the UG,CatiaCAD software, but the rate of utilization of the software designers virtually no evaporator, heater and blower of the new development and design capabilities.
Compared with foreign companies, truck air conditioning industry started late in China, truck air conditioners rely mainly on CKD Assembly. With the rapid development of truck industry, auto air conditioning increasing market demand. Because at that time most of the technical equipment does not meet the production needs of enterprises, many enterprises have been imported technology and equipment from abroad, there are also many places attracting, car air conditioning projects. Since then, truck air conditioning heat was launched, massive restructuring arise. For example, merged with Faw group Mudanjiang air conditioner factory, truck air-conditioner factory of Shanghai and United States joint venture between Delphi truck air conditioning, Shashi truck air conditioner factory and France Valeo joint venture, huada air-conditioner factory in Hunan and Japan joint venture, corunt (http://www.coruntech.com/) truck air conditioner factory in Yantai and Japan joint venture company Denso, Yueyang hengli air conditioning equipment is Beijing Huacheng group holdings. In the 1990 of the 20th century, the domestic truck air-conditioning industry began to develop rapidly and steadily. Import of equipment technology, as companies from different countries and industries do not have uniform technical standards according to their own, combined with a lack of core technology, the truck air-conditioning industry is under threat from foreign counterparts.