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Air cooler you must know something about it 2

Views:4     Author:Site Editor     Publish Time: 2020-10-30      Origin:Site

Finned tube


Basic form

  The basic forms of air cooler fin tubes are: sleeve type, wound type, rolled type, welded type, elliptical tube type, insert type, turbulent type, spoke type, slotted type, corrugated type. The pipe box structure of air cooler mainly includes flange type, pipe plug type and collecting pipe type. Generally flange type is used for medium and low pressure, pipe plug type and collecting pipe type are used for high pressure.


Processing technology

  The manufacturing process of the air cooler finned tube mainly includes integral forming, welding, high frequency welding, and mechanical connection. The integrally formed fin is integrated with the tube, and has good heat transfer, mechanical and thermal expansion performance, but the manufacturing cost is high, and it is suitable for low-fin tubes (ie, threaded tubes).

Welding fins can weld fins and tubes of different materials together, and is easy to manufacture, but the residue in the weld is not conducive to heat transfer, and the welding quality must be guaranteed. The high-frequency welding fins use the high-frequency induction generated by the high-frequency generator to generate high temperature and partly melt at the contact point of the tube surface and the fin. Then the fin and the tube are connected by pressure. There is no flux, Solder, simple to manufacture and excellent in performance, is the most widely used process in industry.


Application

  Air (wind) coolers are mainly used for walking machinery (excavators, loaders, forklifts, cranes, combine harvesters, road construction machinery, construction machinery, etc.), and use air cooling to force the working medium to cool to the required temperature.


Cleaning

  Because most of the cooling water contains calcium, magnesium ions and acid carbonate. When cooling water flows over the metal surface, carbonates are formed. In addition, the oxygen dissolved in the cooling water can cause metal corrosion and form rust. Due to the generation of rust, the heat exchange effect of the condenser decreases. In severe cases, cooling water has to be sprayed outside the shell. In severe cases, the tube will be blocked and the heat exchange effect will be lost. The research data shows that scale deposits have a huge impact on the loss of heat transfer, and the increase in deposits will increase energy costs. Even a thin layer of scale will increase the operating cost of the scaled part of the equipment by more than 40%. Keeping the cooling channel free of mineral deposits can improve efficiency, save energy, extend the service life of the equipment, and save production time and costs.

  For a long time, traditional cleaning methods such as mechanical methods (scraping, brushing), high-pressure water, chemical cleaning (pickling), etc. have encountered many problems when cleaning the equipment: they cannot completely remove deposits such as scale, and the acid causes corrosion to the equipment and forms loopholes. , The residual acid will cause secondary corrosion or under-scaling corrosion to the material, which will eventually lead to the replacement of equipment. In addition, the cleaning waste liquid is toxic and requires a lot of money for wastewater treatment.


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