Heat exchange pipe and on-line pipe-making processing technique thereof

Abstract

The invention discloses a heat exchange pipe, which comprises an outer pipe at least. The interior of the outer pipe serves as a medium passage. A heat exchange element is configured inside the medium passage. The heat exchange element divides the medium passage into a direct heat exchange zone which exchange heat with the outer pipe and an indirect heat exchange zone which exchange heat with the heat exchange element. The heat exchange medium inside the indirect heat exchange zone exchanges heat with the heat exchange medium inside the direct heat exchange zone via the heat exchange element. In addition, the invention provides an on-line pipe-making processing technique of the pipe, which is adopted to overlap the outer pipe with the heat exchange element by means of an on-line welding technique. Because the heat exchange element is configured inside the outer pipe, the heat exchange area of the heat exchange pipe provided by the invention is increased, which greatly improves the heat exchange efficiency of the indirect heat exchange zone so that the heat exchange pipe provided by the invention is superior to the current heat exchange pipes in terms of the overall heat exchange efficiency. In addition, the invention has low cost and is convenient for manufacturing, and the heat exchange pipe provided by the invention can be applied to high-efficiency heat exchangers or heat exchanging equipment of multiple industries like petroleum, chemicals, fertilizer, boilers, pharmacy, foodstuff, electric power, nuclear power, environmental protection, heat supply and the like.

Description

technical field [0001] The invention relates to the technical field of metal tube processing, in particular to a heat exchange tube used for heat exchange equipment such as a heat exchanger. The present invention also relates to the processing technology of the aforementioned heat exchange tube. Background technique [0002] According to GB / T24590-2009 "Heat Exchange Tubes for High Efficiency Heat Exchangers" standard, my country's current high-efficiency heat exchange tubes for heat exchangers are divided into four types, namely T-groove tubes, corrugated tubes, internal wave and external 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 by cold working. ...

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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