Axial positioning device of heat transfer pipe internal rotation cleaning element

Abstract

An axial positioning device for rotating cleaning elements in a heat transfer tube. The deflectors and wall-attached cylinders arranged on the bearing seat and the wall of the heat transfer tube form a spiral flow channel. When the heat transfer fluid entering the tube passes through the spiral flow channel, it forms a The fast swirling flow with a large radius directly pushes the rotary cleaning element to generate a large dynamic moment, which is superimposed on the same direction as the original rotation moment of the cleaning element, which can increase the working torque by more than twice as much as the original, so that the driven The flow rate in the tube required for the rotation of the cleaning element is reduced by more than 60%, so that the self-rotation cleaning and anti-scaling technology can be widely applied to various shell and tube heat transfer equipment with low flow rate. This nozzle fixing device is also equipped with an adjusting plate, which can be used to improve the uniformity of the amount of liquid entering each heat transfer tube, improve the heat transfer efficiency, and the resistance is not large, so the application range is quite wide.

Description

technical field [0001] The invention relates to an axial positioning device for a rotating cleaning element in a heat transfer tube. It is suitable for various shell and tube heat transfer equipment for on-line rotary cleaning, such as heat exchangers, condensers, evaporators, etc. Background technique [0002] US Patent No. 4174750 and Chinese Patent Document CN2214239Y both disclose a cleaning device in a heat transfer tube, which includes a heat transfer tube, a rotating cleaning element in the tube, and a fixing device for the rotating cleaning element at the liquid inlet end of the heat transfer tube. Driven by the heat transfer fluid in the tube, the rotating cleaning element rotates to scrape the dirt on the inner wall of the tube, and has the function of online, automatic and continuous cleaning and anti-scaling; due to the diversion effect of the rotating cleaning element, the liquid flows in a helical line, and the inside of the tube The disturbance of the fluid f...

AI Technical Summary

Problems solved by technology

However, the nozzle fixing device of the rotating cleaning element has such a structural defect: there is no necessary guidance for the flow direction of the fluid inlet, and before the incoming liquid contacts the rotating cleaning element, swirling flow of different degrees will be generated at the inlet of the heat transfer tube , and according to the principle of least resistance, the swirling direction must be the same as the helical direction of the rotating cleaning element

It can be seen from the momentum moment theorem of the particle system that the result will inevitably lead to a reduction in the rotation moment of the rotating cleaning element, making it difficult to apply this technology in conditions where the flow rate is not high or the dirt cleaning resistance is relatively large.

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