Wave-shaped helical groove heat exchange tube and heat exchanger thereof

Abstract

The invention relates to an undee helical groove heat exchange tube and a heat exchanger thereof; the surface of the heat exchange tube is provided with a helical groove protruding inward the tube; two ends of the heat exchange tube body along the length direction are straight tube sections; the middle section is an undee bended tube section; the undee shape is formed that the section center of the heat exchange tube bends upwards and downwards along the horizontal axis; the upper maximal bended range and the lower maximal range are the same; compared with the prior art: 1. Liquid in a bended flow channel is forced to change the flowing direction continuously by the bend setting of the heat exchange tube, thereby promoting the onflow flowing of the liquid; 2. The invention has the effect of strengthening the flowing and promoting the full and uniform mixing of the flowing of refrigerant outside the tube; 3. On the premise of not increasing the length of the heat exchanger, the length of the heat exchange tube is increased; 4. Compared with the prior art, the heat exchange efficiency of the heat exchanger of the invention improves by 5 percent to 10 percent. The invention is in particular suitable for an exhaust gas recycling cooler of an automobile engine to reduce the discharge of automobile tail gas pollutant or is used as an engine turbine pressurization intercooler to improve the performance of the engine.

Description

technical field [0001] The invention relates to a heat exchanger, in particular to a corrugated spiral groove heat exchange tube and a heat exchanger thereof, the heat exchanger is especially suitable for being applied to an exhaust gas recirculation cooling system of an automobile engine to reduce emission of automobile exhaust pollutants, Or as an engine turbo intercooler to improve engine performance. Background technique [0002] The application of heat exchanger has a long history, but it is still in continuous improvement and development. The application of heat exchangers in petrochemical, machinery manufacturing, oil refining, metallurgy, light industry, pharmaceuticals, food and other industries accounts for 40% to 60% of the investment in all process equipment. Therefore, new heat exchangers continue to emerge with the advancement of science and technology. In the field of automobiles, coolers for engine exhaust gas recirculation cooling systems are also being con...

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Problems solved by technology

[0004] At present, how to improve the working efficiency of the heat exchanger without increasing the size of the heat exchanger in the limited space of the automobile engine, people have adopted many technologies in the structure of the heat exchange tube and the layout of the heat exchange tube in the heat exchanger Improvements, including the "scalable heat exchange tubes" disclosed in Chinese Patent No. 93228596.1, which describe that the diameters of the tubes are different, and the "spherical concave-convex heat exchange tubes" disclosed in Chinese Patent No. 96235149.0. Dimples are arranged in order on the surface of the tube. The purpose of the above patents is to increase the heat exchange area of ​​the fluid in the heat exchange tube and to increase the disturbance of the fluid in the heat exchange tube to improve the heat exchange efficiency of the heat exchange tube; but the structure of the above heat exchange tube is still The heat dissipation of the fluid cannot be fully carried out. With the increasingly stringent automobile emission regulations in various countries in the world, the structure of the heat exchange tube and heat exchanger needs to be continuously improved.

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