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Heat exchanger and method of manufacturing the same

A technology for heat exchangers and manufacturing methods, applied in the direction of heat exchanger fixation, heat exchange equipment, chemical instruments and methods, etc., can solve the problems of shallow corrosion depth and achieve light weight and improved corrosion resistance Effect

Inactive Publication Date: 2016-12-14
KEIHIN THERMAL TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] However, in the heat exchanger described in Patent Document 2, in order to secure the required corrosion resistance after thinning the heat exchange tube, it is necessary to reduce the depth of corrosion occurring in the tube wall of the heat exchange tube.

Method used

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  • Heat exchanger and method of manufacturing the same

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Embodiment

[0070] preparing an aluminum brazing sheet for forming a heat exchange tube formed of a core material containing 0.40% by mass of Cu, 0.8% by mass of Mn, and 0.1% by mass of Ti, and a first brazing filler metal and a second brazing filler metal. The remainder is composed of Al and unavoidable impurities, the first brazing filler metal contains 7.5% by mass of Si, 2.0% by mass of Zn, and the remainder is composed of Al and unavoidable impurities, and covers one side of the core material, so The second brazing filler metal contains 10% by mass of Si, and the remainder is composed of Al and unavoidable impurities, and covers the other side of the core material. The covering ratio of the first brazing filler metal in the aluminum brazing sheet for forming heat exchange tubes was 16%, and the covering ratio of the second brazing filler metal was 10%. In addition, the Si content which is an unavoidable impurity in a core material was 0.09 mass %, and the Fe content was 0.09 mass %. ...

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Abstract

The invention provides a heat exchanger of which corrosion resistance is ensured on the basis of thinning the wall of the heat exchanger. A wall of each heat exchange tube of a condenser for a car air conditioner is composed of a core material layer, a first brazing material layer covering the outer surface of the core material layer, and a second brazing material layer covering the inner surface of the core material layer. A Zn diffused layer is formed in an outer surface layer portion of the core material layer. The deepest portion of the Zn diffused layer is located at a position 70 to 100 [mu]m deep from an outermost surface of the wall. The Zn concentration of the outermost surface of the wall of the heat exchange tube is 0.55 mass % or higher. The Zn diffused layer includes a high potential portion whose spontaneous potential is at least 41 mV higher than the spontaneous potential at the boundary between the core material layer and the first brazing material layer.

Description

technical field [0001] The present invention relates to a heat exchanger and a manufacturing method thereof. More specifically, the present invention relates to a heat exchanger used as a condenser for an automobile air conditioner mounted in a vehicle such as an automobile and a manufacturing method thereof. [0002] In this specification and claims, the term "aluminum" includes aluminum alloys in addition to pure aluminum. In addition, a material represented by an element symbol means a pure material, and the meaning of the term "Al alloy" means an aluminum alloy. [0003] In addition, in this specification, the term "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 and pH 3 (acidic). . Background technique [0004] As a heat exchanger used in a condenser for an automobile air conditioner, the following heat exchanger is known: it i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/26F25B39/04
CPCB23P15/26F25B39/04F25B2339/045F28F21/089F28F1/022F28F1/128F28D2021/0084B23K1/0012B32B15/01B32B15/016B32B15/017C22C21/00C22C21/02F28D1/05391F28F21/084F28F2275/04
Inventor 寺田隆大槻拓史小林真奈
Owner KEIHIN THERMAL TECH CORP
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