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JP-7855150-B1 - Heat exchanger, method for manufacturing the same, aluminum alloy plate for forming a flow path, tube material for heat exchanger, and outer wall material for a flow path of a heat exchanger

JP7855150B1JP 7855150 B1JP7855150 B1JP 7855150B1JP-7855150-B1

Abstract

The heat exchanger (1) has a first flow path (11), a plurality of flow path forming sections (2) arranged at intervals from each other, and a second flow path (12) formed between the flow path forming sections (2). The flow path forming section (2) has a first outer wall section (21) that constitutes the portion of the outer wall of the first flow path (11) that faces one of the two second flow paths (12) adjacent to the flow path forming section (2), a second outer wall section (22) that constitutes the portion that faces the other second flow path (12b), and a support section (23) that is arranged between both ends in the width direction of the flow path forming section (2) and is connected to both the first outer wall section (21) and the second outer wall section (22). The first outer wall section (21) and the second outer wall section (22) are made of an aluminum alloy plate (3) having a specific chemical composition.

Inventors

  • 山本 大

Assignees

  • 株式会社UACJ

Dates

Publication Date
20260507
Application Date
20250630
Priority Date
20240704

Claims (17)

  1. A heat exchanger comprising a first flow path, a plurality of flow path forming sections arranged at intervals from each other, and a second flow path formed between the flow path forming sections, configured such that a heat transfer medium in the first flow path and a heat transfer medium in the second flow path can exchange heat, The aforementioned flow channel forming section is The outer wall portion of the first channel, which constitutes the portion of the first channel facing one of the two second channels adjacent to the channel forming portion, The outer wall portion of the first channel, which is the portion of the second channel that faces the other of the two second channels adjacent to the channel forming portion, It has a support portion that is positioned between both ends in the width direction of the flow channel forming portion and is connected to both the first outer wall portion and the second outer wall portion, A heat exchanger in which the first outer wall portion and the second outer wall portion are made of an aluminum alloy plate having a chemical composition containing Si: 1.5% by mass or more and 3.0% by mass or less, Fe: 0.05% by mass or more and 0.6% by mass or less, Mn: 0.3% by mass or more and 2.0% by mass or less, with the remainder being Al and unavoidable impurities.
  2. The heat exchanger according to claim 1, wherein at least one of the first outer wall portion and the second outer wall portion, and the support portion, are made of a common aluminum alloy plate.
  3. The heat exchanger according to claim 1, wherein the support portion is made of an aluminum material different from the aluminum alloy plates constituting the first outer wall portion and the second outer wall portion, and the support portion is joined to the first outer wall portion and the second outer wall portion via brazing.
  4. The heat exchanger according to claim 3, wherein the support portion is an inner fin.
  5. The heat exchanger according to claim 1, wherein the heat exchanger has outer fins provided in the second flow path, and the outer fins, the first outer wall portion, and the second outer wall portion are joined via brazing.
  6. The heat exchanger according to claim 5, wherein the natural electrode potential of the outer fin is less valuable than the natural electrode potential of the first outer wall portion, the second outer wall portion, and the fillet of the brazed joint connecting these outer walls to the outer fin.
  7. The heat exchanger according to claim 1, wherein the aluminum alloy plates constituting the first outer wall portion and the second outer wall portion further contain Zn : more than 0% by mass and 0.7 % by mass or less, and contain as an optional component one or more elements selected from the group consisting of Cu: 0.8% by mass or less, Mg: 0.2% by mass or less, Ti: 0.3% by mass or less, V: 0.3% by mass or less, Zr: 0.3% by mass or less, Cr: 0.3% by mass or less, Bi: 0.1% by mass or less, Ni: 0.6% by mass or less, Sn: 0.3% by mass or less, In: 0.1% by mass or less, Sr: 0.1% by mass or less, Na: 0.1% by mass or less, Sb: 0.3% by mass or less, and Ca: 0.5% by mass or less.
  8. The heat exchanger according to claim 1, wherein the aluminum alloy plates constituting the first outer wall portion and the second outer wall portion further contain Cu: 0.1% by mass or more and 0.8% by mass or less and Zn: more than 0% by mass and 0.7 % by mass or less.
  9. The heat exchanger according to claim 1, wherein the aluminum alloy plates constituting the first outer wall portion and the second outer wall portion further contain Cu: 0.3% by mass or more and 0.8% by mass or less, and contain as an optional component one or more elements selected from the group consisting of Zn: 6.0% by mass or less, Mg: 0.2% by mass or less, Ti: 0.3% by mass or less, V: 0.3% by mass or less, Zr: 0.3% by mass or less, Cr: 0.3% by mass or less, Bi: 0.1% by mass or less, Ni: 0.6% by mass or less, Sn: 0.3% by mass or less, In: 0.1% by mass or less, Sr: 0.1% by mass or less, Na: 0.1% by mass or less, Sb: 0.3% by mass or less, and Ca: 0.5% by mass or less.
  10. A method for manufacturing a heat exchanger according to any one of claims 1 to 9 , The components of the heat exchanger, including the flow path forming section, are assembled to create an assembly. A method for manufacturing a heat exchanger, comprising heating the assembly and brazing it under conditions such that the time required to reach 575°C from 450°C is 4 minutes or more and 15 minutes or less, and the time required to reach 615°C from 575°C is 5 minutes or more and 40 minutes or less.
  11. An aluminum alloy plate for forming flow channels, used to form the outer wall of the flow channel of a heat transfer medium in a heat exchanger, An aluminum alloy plate for forming flow channels has a chemical composition in which it contains Si: 1.5% to 3.0% by mass, Fe: 0.05% to 0.6% by mass, Mn : 0.3% to 2.0% by mass, Zn: more than 0% to 0.7% by mass , and further contains as an optional component one or more elements selected from the group consisting of Cu: 0.8% or less by mass, Mg : 0.2% or less by mass, Ti: 0.3% or less by mass, V: 0.3% or less by mass, Zr: 0.3% or less by mass, Cr: 0.3% or less by mass, Bi: 0.1% or less by mass, Ni: 0.6% or less by mass, Sn: 0.3% or less by mass, In: 0.1% or less by mass, Sr: 0.1% or less by mass, Na: 0.1% or less by mass, Sb: 0.3% or less by mass, and Ca: 0.5% or less, with the remainder being Al and unavoidable impurities.
  12. An aluminum alloy plate for forming flow channels, used to form the outer wall of the flow channel of a heat transfer medium in a heat exchanger, Contains Si: 1.5% by mass or more and 3.0% by mass or less, Fe: 0.05% by mass or more and 0.6% by mass or less, Mn: 0.3% by mass or more and 2.0% by mass or less, Cu: 0.3% by mass or more and 0.8% by mass or less. , Furthermore, as optional components, Zn: 6.0% by mass or less, Mg: 0.2% by mass or less, Ti: 0.3% by mass or less, V: 0.3% by mass or less, Zr: 0.3% by mass or less, Cr: 0.3% by mass or less, B. An aluminum alloy plate for forming flow channels, having a chemical composition containing one or more elements selected from the group consisting of i: 0.1% by mass or less, Ni: 0.6% by mass or less, Sn: 0.3% by mass or less, In: 0.1% by mass or less, Sr: 0.1% by mass or less, Na: 0.1% by mass or less, Sb: 0.3% by mass or less, and Ca: 0.5% by mass or less, with the remainder being Al and unavoidable impurities.
  13. An aluminum alloy plate for forming flow channels, used to form the outer wall of the flow channel of a heat transfer medium in a heat exchanger, Si: 1.5 mass% or more and 3.0 mass% or less, Fe: 0.05 mass% or more and 0.6 mass% or less, Mn: 0.3 mass% or more and 2.0 mass% or less, Cu: 0.1 mass% or more and 0.8 mass% or less, Zn: more than 0 mass% and 6.0 mass% or less. Furthermore, as optional components, Mg: 0.2% by mass or less, Ti: 0.3% by mass or less, V: 0.3% by mass or less, Zr: 0.3% by mass or less, Cr: 0.3% by mass or less, Bi: 0.1% by mass or less, Ni: 0.6% by mass. The following describes an aluminum alloy plate for forming flow channels, which contains one or more elements selected from the group consisting of Sn: 0.3 mass% or less, In: 0.1 mass% or less, Sr: 0.1 mass% or less, Na: 0.1 mass% or less, Sb: 0.3 mass% or less, and Ca: 0.5 mass% or less, and has a chemical composition in which the sum of the Cu content and Fe content in the aluminum alloy plate is greater than 0.65 mass%, with the remainder being Al and unavoidable impurities.
  14. A tube material for a heat exchanger, comprising an aluminum alloy plate for forming flow channels as described in any one of claims 11 to 13 .
  15. The tube material for a heat exchanger according to claim 14, wherein the tube material has a flat portion originating from the central part in the width direction of the aluminum alloy plate, and folded portions formed by folding both ends of the aluminum alloy plate in the width direction toward the central part, and the tips of the folded portions face the flat portion.
  16. A flow channel outer wall material for a heat exchanger, comprising an aluminum alloy plate for forming flow channels as described in any one of claims 11 to 13 , wherein the flow channel outer wall material has a plurality of grooves and connecting portions that connect adjacent grooves.
  17. A flow channel outer wall material for a heat exchanger, comprising an aluminum alloy plate for forming flow channels as described in any one of claims 11 to 13, wherein the material has a flat plate portion and a peripheral edge portion provided around the flat plate portion, and the peripheral edge portion is bent so as to protrude from the flat plate portion in one direction in the thickness direction of the flat plate portion.

Description

This invention relates to a heat exchanger, a method for manufacturing the same, an aluminum alloy plate for forming a flow channel, a tube material for a heat exchanger, and an outer wall material for a flow channel of a heat exchanger. A heat exchanger may have a structure in which a first flow path through which a first heat transfer medium flows and a second flow path through which a second heat transfer medium flows are arranged alternately. For example, Patent Document 1 describes a radiator having a structure in which tubes and fins are alternately stacked. The tube in Patent Document 1 is made of an aluminum alloy clad material comprising a core material, a sacrificial anode material stacked on the first surface of the core material, and a brazing material stacked on the second surface of the core material. Furthermore, brazed joints made of the brazing material of the clad material are formed in the gaps between the edges of the clad material in the tube and in the gaps between the tube and the fins. On the other hand, in recent years, single-layer aluminum alloy materials have been proposed that generate a small amount of molten material upon heating, allowing them to be brazed to a mating material. As an example of this type of aluminum alloy material, Patent Document 2 describes an aluminum alloy material containing Si: 1.0 to 5.0 mass%, Fe: 0.01 to 2.00 mass%, with the remainder being Al and unavoidable impurities. Japanese Patent Publication No. 2012-117107Patent No. 5337326 Figure 1 is a front view of the heat exchanger in Example 1.Figure 2 is a magnified view of a portion of Figure 1.Figure 3 is a cross-sectional view taken along the line III-III in Figure 2.Figure 4 is a partial cross-sectional view showing the main parts of the heat exchanger in Example 2.Figure 5 is a partial cross-sectional view showing the main parts of the heat exchanger in Example 3.Figure 6 is a perspective view of the aluminum alloy plate that constitutes the channel forming section of Example 3.Figure 7 is a partial cross-sectional view showing the main parts of the heat exchanger in Example 4.Figure 8 is a perspective view of the aluminum alloy plate that constitutes the channel forming section of Example 4.Figure 9 is a perspective view of the mini-core test specimen in Experimental Example 1.Figure 10 is an explanatory diagram of the device used to measure the natural electrode potential in Experimental Example 1. (heat exchanger) The heat exchanger has a plurality of flow path forming sections arranged at intervals from each other. Each flow path forming section has a first outer wall section, a second outer wall section, and a first flow path consisting of a space enclosed by the first and second outer wall sections. A second flow path is also formed between adjacent flow path forming sections. Therefore, the first and second flow paths in the heat exchanger are arranged alternately, and the heat exchanger is configured to perform heat exchange between the heat transfer medium in the first flow path and the heat transfer medium in the second flow path. The channel forming section comprises a first outer wall section, a second outer wall section, and a support section. The specific shape of the channel forming section is not particularly limited and can take various forms. For example, the channel forming section may be a flattened pipe having an oval or rectangular cross-sectional shape in a cross-section perpendicular to its extending direction. Alternatively, the channel forming section may have a shape in which the first channel and the support section are alternately connected in the width direction. Furthermore, the channel forming section may have a shape in which two flat plates are stacked on top of each other. The first and second outer wall sections are made of aluminum alloy plates having the aforementioned specific chemical components. The first and second outer wall sections may be made of a common aluminum alloy plate, or they may be made of separate aluminum alloy plates. More specifically, for example, a channel forming section can be obtained in which the first and second outer walls are made of a common aluminum alloy plate by bending a single aluminum alloy plate into a cylindrical shape and joining its end faces together by brazing. Alternatively, for example, a channel forming section can be obtained in which the first and second outer walls are made of different aluminum alloy plates by preparing separate aluminum alloy plates for the first and second outer walls and joining their end faces together by brazing. The more detailed configuration of the aluminum alloy plates constituting the first and second outer walls will be described later. The support portion of the channel forming section is positioned between both ends of the channel forming section in the width direction and is connected to both the first and second outer wall sections. By providing the support portion, which is conn