The production and processing technology and technology of porous flat channels using
aluminum flat tubes. Air-conditioning control system research mainly consists of the following four main components: compressor, condenser, throttling expansion mechanism and evaporator. All-aluminum household aluminum panels on both sides, the PVC core filled in the middle of the PVC panels on the market, usually have a density value of about 1.4-1.8 (the smaller the density value, the better the quality). Products made of top ten brands of aluminum and other alloy elements. Usually it is processed into castings, forgings, foils, plates, strips, tubes, rods, profiles, etc., and then cold bending, sawing, drilling, assembling, coloring and other processes. The main metal element is aluminum, and some alloying elements are added to improve the performance of aluminum. Door and window aluminum door and window materials, the material connected to the wall. Its main feature is that the surface where it meets the wall is mostly flat, which is fixed on the wall and cannot be moved. The condenser and the evaporator are collectively referred to as the heat exchanger, which is the heat exchange unit in the refrigeration and air-conditioning technology equipment, and plays a vital role in the performance of the entire Chinese air-conditioning product. With the rapid development of the air-conditioning industry, there is an increasing demand for new types of heat that are efficient, compact and energy-saving. In particular, since the fatal defects of environmentally friendly traditional HCFC-based refrigerants will be replaced, and when new working pressures such as carbon dioxide, which replace the refrigerant, are high, the heat exchanger needs to have sufficient pressure resistance. Multi-channel parallel flow heat exchanger technology has the characteristics of more compact economic structure, light weight, high heat exchange efficiency, and strong pressure resistance. It has become the main form of heat exchanger with relatively promising market development and research prospects in my country. The parallel flow heat exchanger is composed of perforated flat tubes and corrugated louvered fins. There are headers at both ends of the perforated aluminum flat tubes, and there are partitions in the headers. The number of tubes in each section is different, which can be gradually reduced. Social trend, this variable flow optimization design method can make the effective control volume efficiency of the heat exchanger scientifically and rationally developed and utilized, and improve the heat exchange capacity. The shape of the flow channel of the porous aluminum profile flat tube is mainly rectangular and circular. Since the size of the flow channel is less than 3mm, there will be a scale effect of gas-liquid two-phase flow and heat transfer. In order to improve the heat transfer capacity of the heat exchanger and reduce the weight, the equivalent diameter of the porous flat tube flow channel is getting smaller and smaller, even Reach the level of sub-mm microchannels. Figure 3 illustrates the development trend of porous flat tubes. At present, foreign countries have been able to produce the fourth-generation aluminum extrusion porous flat tube with a tube thickness of 1mm and a flow channel equivalent diameter of 0.5mm. my country is working hard to develop the fourth-generation microchannel porous flat tube. 2. The extrusion process of the porous aluminum profile flat tube is used to produce the parallel flow heat exchanger. The perforated flat tube is the same as the aluminum extrusion process obtained by considering the complexity of the porous structure of the flat tube. The ingot uses the general porthole The aluminum portholes are extruded blanks to ensure uniform wall thickness, while there is a simple production facility with low production costs. It is used to manufacture the porous flat tube, which includes the extrusion tube, the porthole, the splitter bridge, the mandrel, the extrusion die with the working cavity and welding, etc. The flow management process of metal enterprises in split die extrusion can be divided into different splitting, welding and forming research stages. In the splitting education stage, the material is divided into two strands and enters a split hole; in the welding stage, the material develops into the welding room. It is fused into a whole under high temperature and high pressure; in the forming technology stage, the material is extruded from the working belt after filling the welding chamber. The micro-channel tube has many closed cross-sections and many welded surfaces, and the pipe is under alternating pressure conditions in the refrigeration control system. Therefore, the impact of the welded surface on the quality and safety of formed products has become a key capability issue for the extrusion of multi-channel tubes. one of the reasons.
are important in ensuring aluminum extrusion rail, and the machine is utilised by everyone from aluminum window profile manufacturers to aluminum extrusion rail.
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have three basic components.
