Flat spiral heat exchange tube and its on-line tube processing technology

Abstract

The invention discloses a flat spiral heat exchange tube, which at least includes a tube body, the tube body surrounds and forms a medium passage; the tube body has a flat cross section, and the tube body has a spiral outer surface. The present invention also provides an online tube-making process for the above-mentioned flat spiral heat exchange tube. The invention has low cost and convenient manufacture, and is suitable for use as a tube for high-efficiency heat exchangers or heat exchange equipment in various industries such as petroleum, chemical industry, chemical fertilizer, boiler, pharmaceutical, food, electric power, nuclear energy, environmental protection, and heat supply.

Description

technical field [0001] The invention relates to the technical field of metal tube processing, in particular to a flat spiral heat exchange tube used for heat exchange equipment such as heat exchangers. The present invention also relates to the processing technology of the aforementioned flat spiral heat exchange tube. Background technique [0002] According to the standard of GB / T24590-2009 "Special Tubes for High Efficiency Heat Exchangers", the current high-efficiency special tubes for heat exchangers in my country are divided into four types, namely T-groove tubes, corrugated tubes, inner wave and outer threaded tubes, Inner groove tube. The biggest thing they have in common is that they are all heat exchange tubes manufactured and processed on metal base tubes (straight tubes) by cold working process. [0003] Such as figure 1 As shown, in the T-shaped groove pipe in the prior art, dense spiral T-shaped grooves 11 are formed on the outer wall of the metal base pipe 1 b...

AI Technical Summary

Problems solved by technology

[0011] 1. Due to the specifications of cold processing equipment, the finished heat exchange tubes are greatly limited in terms of specifications and length;

[0012] 2. Due to the cold processing steps, the loss of raw materials is relatively large;

[0013] 3. Due to the complex cold processing process, the processing accuracy of the product is uneven;

[0014] 4. It is difficult to guarantee the quality of the finished product by the inspection method and inspection method of the cold processing process;

[0015] 5. Limited by the processing technology, the tube making efficiency is not high;

[0016] 6. Most of these four types of heat exchange tubes have special shapes, which bring a lot of inconvenience to the production of heat exchanger equipment such as the disposal of bellows and baffles of outer grooved tubes;

[0017] 7. These four types of heat exchange tubes have been cold-worked, and there are residual stresses on the tube body, which will form turbulent flow when the medium passes through, which strengthens the local corrosion of the heat exchange tubes, so it has a certain impact on the service life of the heat exchanger equipment. negative impact

[0018] Due to the above reasons, the heat exchange tubes in the prior art have entered a technical bottleneck, and it is difficult to greatly increase the heat exchange area and heat exchange efficiency, which restricts the development of heat exchangers and is difficult to meet the needs of the market

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