Rolling and ploughing-extrusion device and method for manufacturing three-dimensional internal and external finned tubes

Abstract

The invention discloses a rolling and ploughing-extrusion device and method for manufacturing three-dimensional internal and external finned tubes. The device comprises a rack, an adjusting pull rod mechanism, left brackets, a rotatable roller handpiece, an external fin ploughing tool and right brackets. The roller handpiece is provided with external thread roller mechanisms for forming external thread structures on the outer surfaces of metal tubes, and an internal thread roller core mechanism for forming internal thread structures on the inner surfaces of metal tubes. The external thread roller mechanisms are symmetrically distributed on the periphery of the internal thread core mechanism and form roller stations for metal tubes. When metal tubes pass through the roller stations, thread structures are formed on the inner surfaces and the outer surfaces of metal tubes under the rolling action of the external thread roller mechanisms and the internal thread core mechanism. When the device is adopted for machining heat tubes, internal fin structures and external fin structures can be formed at a time, clamping time is effectively shortened, production efficiency is improved, and production cost is lowered.

Description

technical field [0001] The invention relates to a processing technology and equipment for inner and outer finned tubes, in particular to a rolling and plowing-extruding three-dimensional inner and outer finned tube manufacturing equipment and method. Background technique [0002] With the continuous development of society, the problem of energy shortage is becoming more and more serious. As an important way to save energy, enhanced heat transfer technology is of great significance to solve energy problems, and has been widely used in petroleum, chemical, power, nuclear energy, refrigeration and other fields. The heat exchange tube is a key heat transfer element used in enhanced heat transfer technology. Its main feature is that a certain surface structure is processed on the inner and outer surfaces of the tube to expand the heat transfer surface or increase the heat transfer coefficient, thereby improving heat transfer efficiency. At present, the heat exchange tubes used i...

AI Technical Summary

Problems solved by technology

Smooth walls, internally threaded grooves, or straight grooves have limited effect on extending the heat transfer surface

In addition, due to the relatively regular fin structure of the internal thread groove or the straight tooth groove, the expansion surface is relatively regular, and the damage of the boundary layer is limited when the fluid flows through, which cannot form an effective disturbance effect and has limited improvement in the enhanced heat transfer coefficient.

Therefore, it is difficult to obtain higher heat transfer efficiency for heat exchange outer finned tubes with smooth walls, internal thread grooves or straight tooth grooves.

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