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Heat exchanger

A technology for heat exchangers and heat exchange tubes, applied in heat exchange equipment, indirect heat exchangers, heat exchanger types, etc., can solve problems such as insufficient performance, and achieve the effect of preventing pitting corrosion and reducing corrosion speed.

Active Publication Date: 2015-07-29
MAHLE INT GMBH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] However, in the case of the heat exchanger described in the above publication, since the sacrificial anode layer is formed by diffusing Zn and Si on the outer layer of the heat exchange tube, the natural potential of the sacrificial anode layer is higher than that in the tube wall of the heat exchange tube. The natural potential of the inner part of the sacrificial anode layer is 10 to 50mV lower than that of the sacrificial anode layer, so the effect of preventing pitting corrosion based on the sacrificial anode layer may not be fully exerted.

Method used

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Embodiment

[0042] Use the following alloys to form a figure 2 A heat exchange tube made of an extruded profile with a width of 12 mm, a length of 650 mm, and a thickness of 200 μm at the thickest part of the tube wall, wherein the alloy contains 0.25% by mass of Mn, and the remainder is composed of Al and The unavoidable impurity composition is such that the content of Cu as an unavoidable impurity is 0% by mass, and the content of Fe and Si as unavoidable impurities are each 0.2% by mass or less. In addition, a corrugated heat sink was formed using a brazing sheet with a thickness of 70 μm consisting of an aluminum core material containing 0.45 mass % of Si, 1.5 The mass % of Mn, 1.5 mass % of Zn, and the remainder is composed of Al and unavoidable impurities, the covering material made of aluminum brazing material contains 8.7 mass % of Si, the remainder is composed of Al and unavoidable impurities and covers both sides of the core. The cladding rate (cladding rate) of the covering ...

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Abstract

Heat exchange tubes of a heat exchanger are formed of an alloy containing Mn (0.2 to 0.3 mass %), Cu (0.1 mass % or less), and Fe (0.2 mass % or less), the balance being Al and unavoidable impurities. A Zn diffused layer is formed in an outer surface layer portion of the peripheral wall of each heat exchange tube. T≰200, 0.57≰A≰1.5, D / T≰0.55, and 0.0055≰A / D≰0.025 are satisfied, where T is the thickness [μm] of the peripheral wall of the heat exchange tube, A is the Zn concentration [mass %] at the outermost surface of the outer surface layer portion, and D is the maximum depth [μm] of the Zn diffused layer. The spontaneous potential of the Zn diffused layer is lower than that of a portion of the peripheral wall located on the inner side of the Zn diffused layer.

Description

technical field [0001] The present invention relates to a heat exchanger, and more specifically to a heat exchanger used in a condenser for an automobile air conditioner, an evaporator for an automobile air conditioner, a heater core for an automobile air conditioner, or a radiator mounted on a vehicle such as an automobile. [0002] In this specification and claims, the term "aluminum" includes not only pure aluminum but also aluminum alloys. In addition, materials represented by chemical symbols represent pure materials. [0003] In this specification, "spontaneous potential" refers to the electrode potential that a material has with respect to a saturated calomel electrode (S.C.E) as a standard electrode in an aqueous solution of 5% NaCl, pH 3 (acidic). Background technique [0004] As a condenser for automobile air conditioners, the following condensers are widely used, which have: a pair of aluminum liquid collection tanks, which are arranged with the longitudinal dire...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25B39/04F28F21/08B22F1/105
CPCF28F21/084F25B39/04F28F21/08B22F1/105C22C21/00F28F19/06F28D1/05333F28D2021/0084F28D2021/0085F28D2021/0094C22C21/02C21C5/005B32B15/016B32B15/017C22C21/10B23K1/0012B23K35/282B23K35/3605B23K35/362B23K35/025B23K2103/10B23K1/008B23K1/012B23K1/19B23K1/20B23K1/203B23K2101/14B23K2101/35B32B15/01
Inventor 井川洋平寺田隆大槻拓史
Owner MAHLE INT GMBH
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