Copper and aluminum compound column wing radiator copper pipe expansion device and pipe expansion method

Abstract

The invention relates to a copper and aluminum compound column wing radiator copper pipe expansion device and a pipe expansion method. The device comprises a pull rod; a pipe expansion cavity is formed in the pull rod; a pipe expansion device is arranged in the pipe expansion cavity; at least one pipe expansion hole communicating with the pipe expansion cavity is formed in the middle part of the pull rod; and steel balls matched with the pipe expansion device are mounted in the pipe expansion holes. The device is simple in structure, convenient to operate, reasonable in design of expansion tightness and free in adjustment of the pipe expansion quantity; an aluminum wing pipe cannot fall; the expansion is better, so that the heat dissipating quantity of a copper and aluminum compound columnwing radiator is greatly improved, and the service life is prolonged; the pipe wall of a copper pipe is a straight groove; and basically no wake space is formed in the pipe, so that the heat transferquality is improved.

Description

technical field [0001] The invention belongs to the field of machinery, and in particular relates to a copper tube expansion device and a tube expansion method for a copper-aluminum composite column-wing radiator. Background technique [0002] In many pressure vessels, boilers, heat exchangers, evaporators and chemical equipment, etc., when the equipment is manufactured, there is a process called tube expansion. The country also has a standard for the process of tube expansion, and tube expansion is also divided into mechanical tube expansion. and hydraulic expansion tubes. Tube expansion is to generate a certain pressure on it through the tube expander, and the diameter of the tube will expand, thereby eliminating or reducing the gap between the tube and the tube sheet, improving the sealing of the tube mouth, and prolonging the corrosion time of the tube mouth. [0003] Mechanical expansion is the most commonly used method at home and abroad. There are electric, pneumati...

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Problems solved by technology

Hydraulic expansion tube: Forcibly changing the mechanical properties of the copper tube will definitely cause the deformation of the copper tube, causing stress corrosion of the copper tube and greatly shortening the service life

Mechanical expansion tube: Compared with hydraulic expansion tube, it overcomes the instability factor of the two materials in the joint area to a certain extent, but the alloy touch head is forced to push and pull in the copper tube, after all, it will cause damage to the copper tube and fatigue of the wall thickness and wall thickness. Unevenness, reduced corrosion allowance, accelerated corrosion, greatly shortening the service life of the radiator; spiral expansion tube: Although the shortcomings caused by hydraulic and mechanical expansion tubes have been overcome, the expansion tube at the spiral part is 2 to 5 mm, The amount of local tube expansion is too large, and after springback, there will be a gap between the copper tube and the inner wall of the aluminum wing. From the analysis of thermal conductivity, the increase of the gap affects heat transfer. From the analysis of the flow rate of water in the radiator, the dead water area is increased at the bottom of the stud, which affects From the perspective of corrosion resistance, the thinning and unevenness of the copper wall have a great impact on the service life, corrosion resistance and pressure forming capacity of the material, shortening the service life of the radiator

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