Collecting pipe material for micro-channel heat exchanger and preparation method thereof

Abstract

The invention relates to a collecting pipe material for a micro-channel heat exchanger, which consists of a layer of brazing layer alloy and a layer of matrix alloy, wherein the brazing layer alloy comprises the following components in percentage by weight: 9-11% of Si, 0.2-0.4% of Fe, 0.005-0.05% of Cu, 0.005-0.05% of Mn, 0.005-0.05% of Mg, 0.005-0.05% of Cr, 0.3-0.7% of Zn, 0.005-0.05% of Zr, 0.005-0.10% of Ti and the balance of A1; the preparation method of the brazing layer alloy comprises the processes of casting, modifying and founding; the preparation method of the matrix alloy comprises the processes of casting, founding and homogenizing; processes of compositing, hot rolling, cold rolling and intermediate annealing are carried out on the brazing layer alloy and the matrix alloy to obtain the collecting pipe material; the brazing layer alloy has favorable grain refining effect so that favorable fluidity, wettability and gap filling capability are provided during the brazing of the material; cold machining is carried out on the material with a machining rate of 25-35% after the intermediate annealing treatment; and the machining rate can ensure that the forming property is favorable during the pipe making of the material and the fluidity of the brazing layer is favorable during the brazing of the collecting pipe.

Description

technical field [0001] The invention relates to a microchannel heat exchanger, in particular to a collector material for a microchannel heat exchanger and a preparation method thereof, belonging to the technical field of metal material processing. Background technique [0002] Energy saving is an important indicator of air conditioners. Heat exchangers are important components of air conditioners. With the development of modern industry, the requirements for energy saving of air conditioners are getting higher and higher, and the requirements for heat exchanger materials are also getting higher and higher. A single aluminum alloy material can no longer meet the higher requirements for energy saving. Microchannel heat exchangers made of composite materials have become the best choice. Microchannel heat exchanger header materials are used to produce microchannel heat exchanger headers , the main trends in the development of this material technology are: [0003] (1) Research ...

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Problems solved by technology

[0006] The Chinese patent application document with the application number 2004800208146 disclosed a high-strength aluminum alloy brazing sheet on August 30, 2006. The patent application document discloses the following content: the brazing sheet includes an Al-Cu matrix and at least one cladding The cladding layer, the matrix includes the following composition (by weight percentage): Cu: 1.2-4.0, Mn: 0.06-1.5, Mg: 0.06-1.5, Si: ≤0.5, Zn: ≤0.4, Fe: ≤0.5, and may Choose one or more of the following Zr: ≤0.25, Cr: ≤0.25, V: ≤0.25, Ti: ≤0.25, the balance is basically aluminum and incidental elements and impurities, the cladding layer contains Al-Si based Filler alloy and apply the cladding layer on at least one side of the substrate, the brazing sheet has relatively high strength, but is not suitable for high-frequency welding as a header material for microchannel heat exchangers

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