Connecting method of heat exchange aluminium tube

Abstract

The invention discloses a connecting method for a heat exchanging aluminium pipe. A plurality of fins arranged in parallel form a rectangular fin group which passes through a group of lower U-shaped pipes; the diameter of a nozzle of the lower U-shaped pipe is larger than that of the nozzle of an upper U-shaped pipe. The method is characterized in that solder is firstly prepared as sheet-shape and wound at the external diameter of the nozzle of the upper U-shaped pipe till that the upper U-shaped pipe can be just plugged into the lower U-shaped pipe; finally, the U-shaped pipe is symmetrically heated at two sides by dual rows of flames; furthermore, a dismountable steel sleeve is arranged closely to the external side of the interface of the upper U-shaped pipe and the lower U-shaped pipe; the steel sleeve is made of material which can uniformly transmit the temperature; the steel sleeve is made of austenitic heat-resistance stainless steel; the connection of the heat exchanging aluminium pipe is completed by the heating of multi-class flames by times; the thickness of the solder is ranged between 0.5 and 1mm; the optimal thickness of the solder is 0.65mm.

Description

technical field [0001] The invention relates to a connection method of heat exchange tubes, in particular to a connection method of heat exchange aluminum tubes. Background technique [0002] Radiator of prior art adopts the method for copper tube brazing to manufacture originally, and its manufacturing method is: [0003] Such as figure 1 As shown, the heat exchanger in the prior art includes an upper U-shaped tube 1 , a lower U-shaped tube 2 , a baffle plate 3 and a fin group 13 . Its manufacturing process is: [0004] In a first step, the lower U-shaped tube 2 is inserted into the fin set 13 . [0005] First, on the assembly line, a set of cores with predetermined intervals is used to vertically puncture a plurality of fins 9 arranged in parallel, and the fins 9 are fixed on a set of cores in a rectangular shape to form a fin group 13 . In addition, plates 3 made of stainless steel are respectively inserted at the upper and lower ends of the fin group 13 , and the baf...

AI Technical Summary

Problems solved by technology

The air conditioner radiator uses aluminum tubes instead of copper tubes, which will greatly reduce the cost, but in the flame brazing process of aluminum tubes, the annular solder 7 will flow downward after heating to fill the welding gap, and the flow distance of the solder 7 is relatively large. The airtightness of the welded joint is very poor. Moreover, due to the uneven heating of the flame, the heating temperature is difficult to control, and the aluminum tube is easy to burn through, causing damage that cannot be repaired, which greatly reduces the yield rate, so more secure aluminum tubes are needed Joint Welding Method

Images