KR102615029B1 - Heat exchanger and air conditioner including the same - Google Patents

Abstract

This invention relates to a heat exchanger, and more specifically, it relates to an aluminum alloy heat exchanger in which the tubes and heat exchange fins of the heat exchanger are designed to have a potential difference.
A heat exchanger according to one aspect includes a tube through which a refrigerant flows, a heat exchange fin coupled to the surface of the tube, and a filler combining the tube and the heat exchange fin. The tube is made of an aluminum alloy material containing a rare earth metal, and the heat exchange fin and the filler are may be made of an aluminum alloy material containing silicon (Si), copper (Cu), and zinc (Zn).

Description

Heat exchanger and air conditioner including the same {HEAT EXCHANGER AND AIR CONDITIONER INCLUDING THE SAME}

This invention relates to a heat exchanger and an air conditioner including the same. More specifically, it relates to an aluminum alloy heat exchanger designed so that fins and tubes have a potential difference, and an air conditioner including the same.

Generally, a heat exchanger is a device that has a tube through which refrigerant flows inside and exchanges heat with the outside air, a heat exchange fin that contacts the tube to expand the heat dissipation area, and a header through which both ends of the tube communicate, and heat exchanges the refrigerant with the outside air. am. The heat exchanger may include an evaporator or a condenser, and may constitute a refrigeration cycle device with a compressor that compresses the refrigerant and an expansion valve that expands the refrigerant.

Recently, aluminum, which is lightweight and has excellent thermal conductivity, is being used as a material for heat exchanger tubes and heat exchange fins, and research and development of alloy materials to secure the corrosion resistance of aluminum is actively underway. In addition, research is being conducted on organic/inorganic coatings, sacrificial corrosion design of zinc, or sacrificial corrosion design of pins to ensure corrosion resistance of aluminum.

One aspect is to provide a heat exchanger designed to have a high potential in the order of the tube, filler, and heat exchange fin to prevent corrosion of the tube material, and an air conditioner including the same.

In addition, it is intended to provide a heat exchanger in which the tube material is made of an aluminum alloy material containing rare earth metals and an air conditioner including the same.

A heat exchanger according to one aspect includes a tube through which a refrigerant flows; Heat exchange fins coupled to the tube surface; and a filler that couples the tube and the heat exchange fin. The tube is made of an aluminum alloy material containing a rare earth metal, and the heat exchange fin and the filler are made of silicon (Si), copper (Cu), and zinc (Zn). It is prepared with an aluminum alloy material containing.

Additionally, the aluminum alloy material of the tube may further include at least one selected from the group including silicon (Si), iron (Fe), copper (Cu), manganese (Mn), and zirconium (Zr).

In addition, the aluminum alloy material of the tube includes 0.05 to 0.2 parts by weight of rare earth metals relative to the total weight of aluminum, 0.05 to 0.1 parts by weight of silicon (Si), 0.05 to 0.2 parts by weight of iron (Fe), and 0.05 to 0.3 parts by weight compared to the total weight of aluminum. It may further include at least one of copper (Cu), 0.05 to 0.3 parts by weight of manganese (Mn), and 0.01 to 0.05 parts by weight of zirconium (Zr).

Additionally, the rare earth metal may include at least one selected from the rare earth group including yttrium (Y), lanthanum (La), cerium (Ce), neodymium (Nd), scandium (Sc), and ytterbium (Yb).

Additionally, the heat exchange fin may include one brazed and welded to the tube.

Additionally, the electric potential of the tube, the filler, and the heat exchange fin may be formed to sequentially lower.

Additionally, the heat exchange fin may include a core layer and a clad layer formed on at least one surface of the core layer, and the filler may include one formed by melting the clad layer during brazing welding of the heat exchange fin and the tube.

Additionally, the filler may include one having a higher potential compared to the core layer of the heat exchange fin.

Additionally, the core layer of the tube and heat exchange fin may include forming a corrosion potential within the range of 50 to 80 mV.

In addition, the core layer of the heat exchange fin is made of an aluminum alloy material containing 0.1 to 0.6 parts by weight of silicon (Si), 0.05 to 0.2 parts by weight of copper (Cu), and 2.3 to 2.7 parts by weight of zinc (Zn) relative to the total weight of aluminum. It can be.

In addition, the filler may be made of an aluminum alloy material containing 6.8 to 8.2 parts by weight of silicon (Si), 0.1 to 0.25 parts by weight of copper (Cu), and 0.1 to 0.2 parts by weight of zinc (Zn) relative to the total weight of aluminum.

In addition, at least one of the heat exchange fin and the filler is an aluminum alloy material further containing at least one selected from the group including iron (Fe), manganese (Mn), chromium (Cr), zirconium (Zr), and titanium (Ti). It can be prepared with

In addition, the core layer of the heat exchange fin contains 0.1 to 0.3 parts by weight of iron (Fe), 1.0 to 1.5 parts by weight of manganese (Mn), 0.01 to 0.1 parts by weight of chromium (Cr), and 0.01 to 0.1 parts by weight of zirconium ( It may be made of an aluminum alloy material further containing at least one selected from the group consisting of Zr) and 0.01 to 0.1 parts by weight of titanium (Ti).

In addition, the filler is 0.6 to 0.8 parts by weight of iron (Fe), 0.05 to 0.1 parts by weight of manganese (Mn), 0.01 to 0.1 parts by weight of chromium (Cr), 0.01 to 0.1 parts by weight of zirconium (Zr), and 0.01 parts by weight relative to the total weight of aluminum. It may be prepared as an aluminum alloy material further containing at least one selected from the group containing from 0.1 parts by weight of titanium (Ti).

Next, a heat exchanger according to one aspect includes a tube through which a refrigerant flows; Heat exchange fins coupled to the tube surface; and a filler provided between the tube and the heat exchange fin, and is formed so that the electric potential of the tube, the filler, and the heat exchange fin are sequentially lowered.

Additionally, the core layer of the tube and the heat exchange fin may have a potential difference within the range of 50 to 80 mV.

Additionally, the tube may include one made of an aluminum alloy material containing a rare earth metal.

Additionally, the aluminum alloy material of the tube may further include at least one selected from the group including silicon (Si), iron (Fe), copper (Cu), manganese (Mn), and zirconium (Zr).

In addition, the aluminum alloy material of the tube includes 0.05 to 0.2 parts by weight of rare earth metals relative to the total weight of aluminum, 0.05 to 0.1 parts by weight of silicon (Si), 0.05 to 0.2 parts by weight of iron (Fe), and 0.05 to 0.3 parts by weight compared to the total weight of aluminum. It may further include at least one of copper (Cu), 0.05 to 0.3 parts by weight of manganese (Mn), and 0.01 to 0.05 parts by weight of zirconium (Zr).

Additionally, the rare earth metal may include at least one selected from the group including yttrium (Y), lanthanum (La), cerium (Ce), neodymium (Nd), scandium (Sc), and ytterbium (Yb).

Additionally, the heat exchange fins and fillers may be made of an aluminum alloy material containing silicon (Si), copper (Cu), and zinc (Zn).

In addition, the core layer of the heat exchange fin is made of an aluminum alloy material containing 0.1 to 0.6 parts by weight of silicon (Si), 0.05 to 0.2 parts by weight of copper (Cu), and 2.3 to 2.7 parts by weight of zinc (Zn) relative to the total weight of aluminum. It can be.

In addition, the filler may be made of an aluminum alloy material containing 6.8 to 8.2 parts by weight of silicon (Si), 0.1 to 0.25 parts by weight of copper (Cu), and 0.1 to 0.2 parts by weight of zinc (Zn) relative to the total weight of aluminum.

In addition, at least one of the heat exchange fin and the filler is an aluminum alloy material further containing at least one selected from the group including iron (Fe), manganese (Mn), chromium (Cr), zirconium (Zr), and titanium (Ti). It can be prepared with

In addition, the core layer of the heat exchange fin contains 0.1 to 0.3 parts by weight of iron (Fe), 1.0 to 1.5 parts by weight of manganese (Mn), 0.01 to 0.1 parts by weight of chromium (Cr), and 0.01 to 0.1 parts by weight of zirconium ( It may be made of an aluminum alloy material further containing at least one selected from the group consisting of Zr) and 0.01 to 0.1 parts by weight of titanium (Ti).

In addition, the filler is 0.6 to 0.8 parts by weight of iron (Fe), 0.05 to 0.1 parts by weight of manganese (Mn), 0.01 to 0.1 parts by weight of chromium (Cr), 0.01 to 0.1 parts by weight of zirconium (Zr), and 0.01 parts by weight relative to the total weight of aluminum. It may be made of an aluminum alloy material further containing at least one of titanium (Ti) in an amount of 0.1 parts by weight.

Next, in an air conditioner including a heat exchanger according to one aspect, the heat exchanger includes: a tube through which a refrigerant flows; Heat exchange fins coupled to the tube surface; and a filler that couples the tube and the heat exchange fin. The tube is made of an aluminum alloy material containing a rare earth metal, and the heat exchange fin and the filler are made of silicon (Si), copper (Cu), and zinc (Zn). It is prepared with an aluminum alloy material containing.

Additionally, the aluminum alloy material of the tube may further include at least one selected from the group including silicon (Si), iron (Fe), copper (Cu), manganese (Mn), and zirconium (Zr).

Additionally, the rare earth metal may include at least one selected from the group including yttrium (Y), lanthanum (La), cerium (Ce), neodymium (Nd), scandium (Sc), and ytterbium (Yb).

Additionally, the electric potential of the tube, the filler, and the heat exchange fin may be formed to sequentially lower.

Additionally, the heat exchange fin may include a core layer and a clad layer provided on at least one surface of the core layer, and the filler may include one having a higher potential compared to the core layer of the heat exchange fin.

Additionally, the core layer of the tube and heat exchange fin may form a corrosion potential within the range of 50 to 80 mV.

In addition, at least one of the heat exchange fin and the filler is an aluminum alloy material further containing at least one selected from the group including iron (Fe), manganese (Mn), chromium (Cr), zirconium (Zr), and titanium (Ti). It can be prepared with

According to the heat exchanger according to one aspect, the corrosion resistance of the heat exchanger tube material can be improved by designing the potential difference in the order of the core layers of the tube, filler, and heat exchange fin.

More specifically, the corrosion resistance of the heat exchanger tube material can be improved simply by alloying the material used as the tube material.

Additionally, the cost of coating performed after brazing fins and tubes can be reduced.

1 is a diagram illustrating the appearance of an air conditioner according to an embodiment.
Figure 2 is a diagram illustrating a configuration related to the flow of refrigerant in an air conditioner according to an embodiment.
Figure 3 is a diagram showing the appearance of a heat exchanger according to an embodiment.
Figure 4 is an exploded perspective view showing a heat exchanger according to an embodiment.
Figure 5 is an enlarged view of part A of Figure 4.
Figure 6 is a diagram showing an example of coupling a heat exchange fin and a tube of a heat exchanger according to an embodiment.
Figure 7 is a diagram showing the process of brazing and welding heat exchange fins to a plurality of tubes.
Figures 8 and 9 are diagrams to explain galvanic corrosion.
Figure 10 is a diagram illustrating an example of potential difference design of a heat exchanger according to an embodiment.
Figure 11 is a diagram illustrating a corrosion process of a heat exchanger according to an embodiment.

Hereinafter, an embodiment of a heat exchanger will be described in detail with reference to the attached drawings.

Generally, a heat exchanger is a device that has a tube through which refrigerant flows inside and exchanges heat with the outside air, a heat exchange fin that contacts the tube to expand the heat dissipation area, and a header through which both ends of the tube communicate, and heat exchanges the refrigerant with the outside air. am.

These heat exchangers can be applied in various forms within the scope of performing heat transfer between high-temperature liquid and low-temperature liquid. For example, heat exchangers can be applied to various fields such as waste heat recovery, cooling of high-temperature fluids, heating of low-temperature fluids, condensation of vapor, and evaporation of low-temperature fluids.

These heat exchangers can be applied to various devices including air conditioners, refrigerators, etc. Hereinafter, before explaining the heat exchanger, an application example of the heat exchanger will be explained using an air conditioner as an example.

FIG. 1 is a diagram illustrating the exterior of an air conditioner according to an embodiment, and FIG. 2 is a diagram illustrating a configuration related to the flow of refrigerant of the air conditioner according to an embodiment.

Referring to FIG. 1, an air conditioner 200 according to an embodiment includes an outdoor unit 300 provided in an outdoor space to perform heat exchange between outdoor air and refrigerant, and an outdoor unit 300 provided in an indoor space to perform heat exchange between indoor air and refrigerant. It includes an indoor unit 400 that performs heat exchange.

The outdoor unit 300 includes a main body 310 that forms the exterior of the outdoor unit 300, and an outdoor unit outlet 311 provided on one side of the outdoor unit main body 310 to discharge heat-exchanged air.

The indoor unit 400 includes an indoor unit main body 410 that forms the exterior of the indoor unit 400, an indoor unit outlet 411 provided on the front of the indoor unit main body 410 to discharge heat-exchanged air, and an air conditioner 200 from the user. ) may include an input unit 412 that receives an operation command, and a display unit 413 that displays operation information of the air conditioner 200.

Referring to FIG. 2, the air conditioner 200 according to one embodiment is connected between the outdoor unit 300 and the indoor unit 400 along with the outdoor unit 300 and the indoor unit 400, and has a gaseous refrigerant flowing therein. It includes a gas pipe (P1) that serves as a passage and a liquid pipe (P2) that serves as a passage through which liquid refrigerant flows, and the gas pipe (P1) and liquid pipe (P2) extend into the outdoor unit 300 and the indoor unit 400.

The outdoor unit 300 includes a compressor 310 that compresses the refrigerant, an outdoor heat exchanger 320 that performs heat exchange between outdoor air and the refrigerant, and an outdoor heat exchanger that exchanges the refrigerant compressed in the compressor 310 according to the heating or cooling mode. A four-way valve 330 that selectively guides the refrigerant to one of the unit 320 and the indoor unit 400, an outdoor expansion valve 340 that depressurizes the refrigerant guided to the outdoor heat exchanger 320 in the heating mode, and an outdoor expansion valve 340 that evaporates before it evaporates. It includes an accumulator 350 that prevents unused liquid refrigerant from flowing into the compressor 310.

The compressor 310 can compress low-pressure gaseous refrigerant to high pressure using the rotational force of a compressor motor (not shown) that rotates by receiving electrical energy from an external power source.

The four-way valve 330 guides the refrigerant compressed in the compressor 310 to the outdoor heat exchanger 320 during cooling, and guides the refrigerant compressed in the compressor 310 to the indoor unit 400 during heating.

The outdoor heat exchanger 320 condenses the refrigerant compressed in the compressor 310 during cooling, and evaporates the refrigerant decompressed in the indoor unit 400 during heating. As such an outdoor heat exchanger 320, the heat exchanger 1 according to the disclosed invention may be applied. In other words, it includes a tube 10 through which the refrigerant flows, and a heat exchange fin 30 coupled to the surface of the tube, and the tube 10 and the heat exchange fin 30 may be coupled by a filler 36. Hereinafter, descriptions that overlap with those described above will be omitted.

The outdoor expansion valve 340 not only depressurizes the refrigerant in the heating mode, but also adjusts the amount of refrigerant provided to the outdoor heat exchanger 320 to ensure sufficient heat exchange in the outdoor heat exchanger 320. Specifically, the outdoor expansion valve 340 can depressurize the refrigerant by using the throttling action of the refrigerant, which reduces the pressure without heat exchange with the outside when the refrigerant passes through a narrow passage.

The indoor unit 400 includes an indoor heat exchanger 410 that performs heat exchange between the refrigerant and indoor air, and an indoor expansion valve 420 that depressurizes the refrigerant provided to the indoor heat exchanger 410 during cooling.

The indoor heat exchanger 410 can evaporate low-pressure liquid refrigerant during cooling and condense high-pressure gaseous refrigerant during heating. The heat exchanger 1 according to the disclosed invention may be applied to the indoor heat exchanger 320, and for convenience of explanation, descriptions that overlap with those described above will be omitted.

The indoor expansion valve 320 not only depressurizes the refrigerant using a throttling action, but also adjusts the amount of refrigerant provided to the outdoor heat exchanger 320 to ensure sufficient heat exchange in the indoor heat exchanger 410.

In the above, an example in which the heat exchanger 1 according to an embodiment is applied to the air conditioner 200 has been described.

Next, the heat exchanger 1 according to the disclosed invention will be described in more detail.

FIG. 3 is a view showing the appearance of a heat exchanger according to an embodiment, FIG. 4 is an exploded perspective view showing a heat exchanger according to an embodiment, FIG. 5 is an enlarged view of portion A of FIG. 4, and FIG. 6 is a diagram showing an example of coupling a heat exchange fin and a tube of a heat exchanger according to an embodiment.

Referring to FIGS. 3 to 6 , the heat exchanger 1 according to an embodiment may include a plurality of tubes 10, headers 20a and 20b, and a plurality of heat exchange fins 30.

The plurality of tubes 10 may be arranged side by side, and a channel may be formed therein so that the refrigerant, which is a fluid, can flow. In addition, the plurality of tubes 10 may be combined to form a tube assembly.

The refrigerant can exchange heat with external air while changing phase from a gaseous state to a liquid state (compression), or exchange heat with external air while changing phase from a liquid state to a gaseous state (expansion). When the refrigerant changes phase from a gaseous state to a liquid state, the heat exchanger 1 can be used as a condenser, and when the refrigerant changes phase from a liquid state to a gaseous state, the heat exchanger 1 can be used as an evaporator.

The plurality of tubes 10 may be extruded or injection molded, and for convenience of explanation, the case where the plurality of tubes 10 are injection molded will be taken as an example. Depending on the embodiment, connecting members may be coupled to both ends of the plurality of tubes 10. The connecting member 12 may be coupled to both ends of the plurality of tubes 10 to form a tube array. The connecting member may be separate from the plurality of tubes 10, but depending on the embodiment, the connecting member may be injection molded integrally with the plurality of tubes 10.

The headers 20a and 20b may include a first header 20a and a second header 20b coupled to the outside of the connecting member. The first header 20a may be coupled to the outside of the tube 10 so that it faces the first direction, and the second header 20b may face the second direction B. The first header 20a and the second header 20b may be arranged to be spaced apart from each other at a certain interval, and a plurality of tubes 10 may be arranged between the first header 20a and the second header 20b. there is.

One end of a plurality of tubes 10 facing the first direction D1 may be connected to the first header 20a, and a plurality of tubes 10 facing the second direction D2 may be connected to the second header 20b. Other ends may be connected. However, the arrangement structure of the headers 20a and 20b and the plurality of tubes 10 is not limited to the above-described example.

The first header 20a may include an inlet header 21 and an outlet header 22, and an inlet through which refrigerant flows toward the plurality of tubes 10 is formed in the inlet header 21, and an outlet header 22 ), an outlet through which refrigerant flows out from a plurality of tubes may be formed.

Depending on the embodiment, the inflow header 21 may be provided in the second header 20b or the outflow header 22 may be provided in the second header 20b so that the inflow header and the outflow header face different directions. am.

The heat exchange fin 30 may be interposed between the plurality of tubes 10 so that the refrigerant flowing along the channel formed inside the tube 10 and external air can efficiently exchange heat. That is, the heat exchange fins 30 may be arranged to contact the tube 10 in the heat exchange space.

The portion where the plurality of heat exchange fins 30 and the plurality of tubes 10 are in contact may be fixed by brazing welding. Brazing welding is a method of welding by melting filler metal at a high temperature. In this case, the filler metal may be used with a lower melting point than the adhesive to be bonded.

Hereinafter, the combination form of the tube 10 and the heat exchange fin 30 will be described in more detail with reference to FIG. 7. Figure 7 is a diagram showing the process of brazing and welding the heat exchange fins 30 to a plurality of tubes 10.

Referring to Figure 7, the heat exchange fins 30 may be provided in a shape that is bent multiple times. In more detail, the heat exchange fin 30 may include a first inclined surface inclined upward in the first direction and a second inclined surface extending from the first inclined surface and inclined downward in the first direction. Here, the first direction is defined as the direction in which the heat exchange fin 30 extends along the contact portion between the tube 10 and the heat exchange fin 30. The heat exchange fins 30 may be provided in a zigzag shape by combining a plurality of first and second inclined surfaces. Depending on the embodiment, the heat exchange fin 30 may be formed in various shapes to increase the surface in contact with external air, and the portion where the first inclined surface and the second inclined surface are connected and bent is the contact portion 10a with the tube 10. ) can be installed so that heat exchange occurs by contacting the inner surface of the unit.

The fin material of the heat exchange fin 30 may be a brazing sheet-type fin material that can be soldered at high temperature. This brazing sheet (S) may include a core layer 32 and a clad layer 34 formed on one or both sides of the core layer 32.

When the clad layer 34 is formed on one side of the core layer 32, when the tube 10 and the heat exchange fin 30 are brazed and welded, the clad surface of the clad layer 34 and the tube 10 face each other. Brazing welding can be performed. Depending on the embodiment, when the heat exchange fins 30 are interposed between the plurality of tubes 10, it is preferable to form the clad layer 34 on both sides of the core layer 32.

During the brazing welding process, high temperature heat may be applied to the clad layer 34, and as a result, the clad layer 34 may be melted to fix the contact portion 10a of the tube 10 and the heat exchange fin 30. Hereinafter, the joining portion formed between the core layer 32 of the heat exchange fin 30 and the tube 10 by melting the clad layer 34 of the heat exchange fin 30 is defined as the filler 36.

The filler 36 is formed by melting the clad layer 34 of the heat exchange fin 30, and its components may be the same as those of the clad layer 34. In other words, the aluminum alloy material formed by melting the clad layer 34 may become filler metal to form a filler. However, depending on the embodiment, the potential value of the clad layer 34 and the potential value of the filler 36 may differ slightly due to the heat applied during the melting process, and other physical characteristics may vary.

The purpose of the heat exchanger (1) according to the disclosed invention is to improve the corrosion resistance of the tube by forming a high electrode potential of the tube (10) by optimizing the alloy element component added to the tube material and fin material of the heat exchanger (1). do. In other words, by setting the electrode potential of the heat exchange fin 30 to be low, sacrificial corrosion of the heat exchange fin 30 can be induced, and as a result, the tube material can be protected.

Such sacrificial corrosion of the heat exchange fin 30 is called galvanic corrosion (or dissimilar metal contact corrosion), and for better understanding, galvanic corrosion will be described in more detail with reference to FIGS. 8 and 9.

Galvanic corrosion is corrosion that occurs when different metals come into contact and one metal accelerates the oxidation of the other metal. It can occur due to differences in the inherent electrical potential of the different metals. Specifically, when different metals are electrically connected and come into contact with an electrolyte solution, a corrosion cell is formed. At this time, the metal with a lower potential becomes an anode and corrosion is accelerated, and the metal with a higher potential becomes an anode and accelerates corrosion. The metal becomes a cathode and is protected.

Referring to Figure 8, when zinc (Zn) and iron (Fe) come into contact, zinc (Zn), which has a relatively low potential, becomes an anode and corrosion of zinc (Zn) can be promoted, and the corrosion of zinc (Zn) can be promoted. Iron (Fe) with a high value becomes a cathode and corrosion of iron (Fe) can be prevented. Specifically, electrons (e-) move from zinc (Zn) to iron (Fe), and ionized zinc (Zn^2+) is dissolved in the electrolyte solution. In other words, zinc (Zn) corrodes before iron (Fe), and as a result, corrosion of iron (Fe) can be slowed down by cathodic protection.

Referring to Figure 9, when copper (Cu) and iron (Fe) come into contact, iron (Fe) with a relatively low potential becomes an anode and corrosion can be promoted, and copper (Cu) with a relatively high potential becomes an anode. ) becomes the cathode and corrosion of copper (Cu) can be prevented. Specifically, electrons (e-) move from iron (Fe) to copper (Cu), and ionized iron (Fe^2+) is dissolved in the electrolyte solution. In other words, iron (Fe) corrodes before copper (Cu), and as a result, corrosion of copper (Cu) can be slowed down through cathodic protection.

Summarizing what is shown in Figures 8 and 9, the intrinsic potential of metals is low in the order of zinc (Zn), iron (Fe), and copper (Cu), and therefore zinc (Zn), iron (Fe), and copper (Cu) ) can be confirmed that corrosion of zinc can occur most quickly when they come into contact with each other.

Corrosion of metals can be prevented by reversing the corrosion action described above, and this is called cathodic protection. The heat exchanger 1 according to this embodiment can prevent corrosion of the tube 10 by using a cathodic protection method. More specifically, the tube material can be protected by designing the tube 10 of the heat exchanger 1 and the core layer 32 of the heat exchange fin 30 to have a potential difference in the range of about 50 to 80 mV. However, the above-mentioned numerical range is for explaining preferred embodiments of the invention, and the technical idea of the invention is not limited by the above-mentioned numerical range.

Regarding the potential difference design, if the potential difference between the tube 10 and the core layer 32 is too large, corrosion of the heat exchange fin 30 may accelerate, making it difficult to prevent the tube 10 from corroding, and it may be difficult to prevent the tube 10 and the core layer from being corroded. If the potential difference between the layers 32 is too small, corrosion of the heat exchange fins 30 and the tubes 10 may proceed simultaneously, and as a result, it may be difficult to protect the tubes 10. Accordingly, in order to prevent corrosion of the tube 10, it is necessary to control the corrosion potential formed between the tube 10 and the core layer 32 within a certain range when a galvanic pair is formed between the tube 10 and the core layer 32. There is.

For the same reason, the corrosion potential formed between the core layer 32 and the filler 36, the filler 36 and the surface of the tube 10, and the surface of the tube 10 and the inside of the tube 10 also need to be appropriately controlled. According to one example, the corrosion potential formed between the core layer 32 and the filler 36, the filler 36 and the surface of the tube 10, and the surface of the tube 10 and the inside of the tube 10 are each in the range of 10 to 30 mV. It can be formed as However, the above-mentioned numerical range is for explaining preferred embodiments of the invention, and the technical idea of the invention is not limited by the above-mentioned numerical range.

In the disclosed invention, various materials can be added at various composition ratios to each aluminum alloy material to adjust the potential difference formed between the tube 10, the filler 36, and the core layer 32. Hereinafter, the composition ratio of the aluminum alloy material will be described in detail.

First, the aluminum alloy material components of the tube 10 for the heat exchanger 1 according to an embodiment will be described.

The tube 10 for the heat exchanger 1 according to one embodiment may be made of an aluminum alloy material. In general, aluminum materials are light and have high durability, and in particular, the aluminum material mainly used as the material for the tube 10 may be an aluminum-manganese-based (A3XXX) material with high strength and corrosion resistance. For example, an aluminum material such as A3102 may be used, but examples of the aluminum material used as a material for the tube 10 are not limited to the above-described examples.

The tube 10 for the heat exchanger 1 may contain rare earth metals using the above-described aluminum material as a base material, and depending on the embodiment, silicon (Si), iron (Fe), copper (Cu), and manganese (Mn). ) and zirconium (Zr).

The amount of these components added can be appropriately adjusted within the target range for forming a high potential of the tube 10. Specifically, the aluminum alloy material may include 0.05 to 0.2 parts by weight of rare earth metals relative to the total weight of aluminum, and depending on the embodiment, 0.05 to 0.1 parts by weight of silicon (Si) and 0.05 to 0.2 parts by weight of iron (Fe) relative to the total weight of aluminum. , 0.05 to 0.3 parts by weight of copper (Cu), 0.05 to 0.3 parts by weight of manganese (Mn), and 0.01 to 0.05 parts by weight of zirconium (Zr).

Hereinafter, the properties of each component included in the aluminum alloy material forming the tube 10 and the reason for controlling the content of each component will be described in detail.

First, the aluminum alloy tube material contains rare earth metals.

In general, rare earth elements are chemically very stable, withstand dry air well, and conduct heat well. In the disclosed invention, the susceptibility to intergranular corrosion due to the addition of iron (Fe), manganese (Mn), copper (Cu), etc. can be reduced by adding rare earth metals to the aluminum alloy tube material.

Specifically, when the content of iron (Fe), manganese (Mn), copper (Cu), etc. in the aluminum alloy tube material is increased, a precipitate phase may be formed at the interface of the tube material. In other words, intermetallic compounds such as Al2Cu and Al3Fe can be formed at the grain boundary of the tube material, and if such intermetallic compounds are formed at the grain boundary, pitting corrosion may be caused.

Pitting refers to corrosion that creates holes or pits on the metal surface through localized corrosion. Depending on the embodiment, there may be cases where this form of corrosion is useful, but if pitting corrosion occurs in the tube material of the heat exchanger (1), there is a risk of deteriorating the durability of the heat exchanger (1), so the heat exchanger according to the disclosed invention In group (1), it is desirable to minimize this corrosion.

Small pits are usually covered with corrosion products, making them difficult to detect, and the number and depth of pits vary, making it difficult to quantify damage caused by pitting. Additionally, fitting usually requires an incubation period, but once initiated, the rate of increase can be accelerated. Therefore, in order to avoid such pitting, it is desirable to use a new material that does not have a tendency to pitting corrosion, or to use a material with strong corrosion resistance.

Accordingly, the aluminum alloy material according to the disclosed invention adds a rare earth metal and adjusts its content to avoid pitting corrosion, thereby forming a metal gap between the iron (Fe), manganese (Mn), or copper (Cu) elements and the aluminum component in the alloy material. It can prevent liver compounds from forming. The rare earth metal used in the aluminum composition according to the disclosed invention is at least one selected from the group including yttrium (Y), lanthanum (La), cerium (Ce), neodymium (Nd), scandium (Sc), and ytterbium (Yb). It can be included. However, examples of rare earth metals that can be used are not limited to this.

Among rare earth metals, yttrium (Y) is used as an example to explain its operating principle. Depending on the embodiment, a small amount of yttrium (Y) may be added to the aluminum alloy material to improve the corrosion resistance of aluminum.

When yttrium (Y) is added to an aluminum alloy material, Al3Y suppresses the occurrence of pitting corrosion by mitigating the formation of intermetallic compounds such as Al2Cu and Al3Fe at the grain boundary of the tube material. It can improve corrosion resistance in corrosive environments by preventing peeling of passive films such as Al2O3 from the tube surface.

Meanwhile, when an aluminum alloy material contains a large amount of rare earth elements, intermetallic reactions may occur between the rare earth elements and other metal components within the aluminum alloy, and as a result, the mechanical properties of aluminum may deteriorate. Therefore, taking this into consideration, it is desirable to appropriately adjust the upper limit range of rare earth elements contained in aluminum alloy materials.

Additionally, the aluminum alloy material may contain silicon (Si).

Silicon (Si) is the main impurity element of industrial aluminum contained in the form of 4 to 10 parts by weight silica in bauxite, the raw material ore of aluminum, and is added to casting materials to increase fluidity and castability. It can increase the extrudability of the material and reduce casting defects. However, if the content of silicon (Si) is too high, the extrudability of the casting material may decrease and casting defects may occur. Therefore, the upper limit of the silicon (Si) content is preferably adjusted to 0.1 part by weight or less relative to the total weight of aluminum.

Additionally, the aluminum alloy material may contain iron (Fe).

Iron (Fe) is the main impurity element of industrial aluminum contained in the form of 10 to 30 parts by weight iron oxide in bauxite, a raw material ore of aluminum. The content of iron (Fe) added to aluminum alloy materials is equal to that of all aluminum. It can be adjusted to less than 0.1 part by weight.

Iron (Fe) in the aluminum alloy material forms intermetallic compounds such as Al3Fe and Al7Cu2Fe, and the higher the content, the lower the corrosion resistance of the tube 10. Therefore, the upper limit of the iron (Fe) content can be adjusted to 0.1 part by weight or less. You can.

Additionally, the aluminum alloy tube material may contain manganese (Mn).

Manganese (Mn) can refine the structure and increase the strength of the tube material by controlling the size of the precipitate particles to be uniform. Accordingly, to ensure reliable strength of the alloy tube material, the lower limit of the manganese (Mn) content can be adjusted to 0.2 parts by weight or more based on the total weight of aluminum.

However, if the content of manganese (Mn) in the aluminum alloy tube material is excessively high, the extrudability of the aluminum alloy tube material may be reduced. Therefore, the manganese (Mn) content can be adjusted to 0.3 parts by weight or less based on the total weight of aluminum to ensure appropriate strength and at the same time ensure extrudability of the aluminum alloy tube material.

Additionally, the aluminum alloy tube material may contain copper (Cu).

As mentioned above, copper (Cu) has a higher potential than zinc (Zn) or iron (Fe). Therefore, by designing the content of copper (Cu) contained in the tube material to be higher than that of the fin material, the tube material has a higher potential than the fin material. First, it can prevent corrosion. In order to design the potential difference between the tube material and the fin material, the lower limit of the copper content contained in the tube material can be adjusted to 0.2 parts by weight or more compared to the total weight of aluminum.

On the other hand, if the content of copper (Cu) contained in the aluminum alloy material is excessively high, intermetallic compounds such as Al2Cu and Al7Cu2Fe may be formed, thereby reducing the corrosion resistance of the tube material. Accordingly, the upper limit of the copper (Cu) content can be adjusted to 0.3 parts by weight or less based on the total weight of aluminum.

Additionally, the aluminum alloy tube material may contain zirconium (Zr).

Zirconium (Zr) can improve strength by refining the grain size, and generates a potential difference inside the material to finely disperse precipitates, which act as the starting point of corrosion, and iron (Fe) and manganese (Mn) ), the susceptibility to intergranular corrosion due to the addition of copper (Cu), etc. can be reduced.

For this purpose, the zirconium (Zr) content can be adjusted to a range of 0.01 to 0.05 parts by weight relative to the total aluminum alloy, and if it is outside this range, corrosion resistance may be reduced. Specifically, if the zirconium (Zr) content exceeds the standard value, the strength of the alloy material increases due to the inherent properties of zirconium (Zr), which may reduce the extrudability of the alloy material, and if the zirconium (Zr) content falls below the standard value, the strength of the alloy material may increase. In this case, it may be difficult for the characteristics of zirconium (Zr) to be expressed. Accordingly, it is desirable to appropriately control the content of zirconium (Zr), and descriptions that overlap with those described in the rare earth metal section below will be omitted.

Next, the aluminum alloy material components of the fin material for the heat exchanger 1 according to an embodiment will be described in more detail.

The fin material of the heat exchanger 1 according to one embodiment may be a brazing sheet fin material that can be soldered at high temperature. The brazing sheet may be formed by joining the core layer 32 and the cladding layer 34, and when the tube 10 and the brazing sheet are joined by brazing welding, the cladding layer 34 of the brazing sheet is melted to form the core. A filler 36 may be formed between layer 32 and tube 10. The filler 36 is formed by melting the clad layer 34, and therefore its components may be the same or similar to those of the clad layer 34. For this reason, the term fin material hereinafter may be a concept that includes the core material forming the core layer 32 of the heat exchange fin 30 and the clad material forming the clad layer 34 of the heat exchange fin 30. Depending on the example, the concept may include a core material forming the core layer 32 of the heat exchange fin 30 and a filler 36 material forming the filler 36.

The core layer 32 and the clad layer 34 of the brazing sheet may each be made of aluminum material. The aluminum material used for the core layer 32 and the clad layer 34 may be an aluminum-manganese-based (A3XXX) material or an aluminum-silicon-based (A4XXX) material. According to one example, an aluminum material such as A3003 may be used for the core layer 32, and an aluminum material such as A4343 may be used for the sheet layer. However, examples of aluminum materials used for the core layer 32 and the clad layer 34, respectively, are not limited to the examples described above.

The fin material for the heat exchanger 1 may be made of an aluminum alloy material containing silicon (Si), copper (Cu), and zinc (Zn) based on an aluminum material. Here, the amount of components included in the aluminum alloy material can be adjusted to a certain concentration range within the target range for controlling the potential of the fin material. In more detail, silicon (Si) and copper (Cu) included in the aluminum alloy material forming the filler 36 and the core layer 32, respectively, so that the filler 36 forms a higher potential compared to the core layer 32. ) and zinc (Zn) content can be adjusted.

According to one example, the core layer 32 is made of an aluminum alloy material containing 0.1 to 0.6 parts by weight of silicon (Si), 0.05 to 0.2 parts by weight of copper (Cu), and 2.3 to 2.7 parts by weight of zinc (Zn) relative to the total weight of aluminum. It can be. In addition, the filler 36 may be made of an aluminum alloy material containing 6.8 to 8.2 parts by weight of silicon (Si), 0.1 to 0.25 parts by weight of copper (Cu), and 0.1 to 0.2 parts by weight of zinc (Zn) relative to the total weight of aluminum. .

Meanwhile, according to the embodiment, the aluminum alloy material contains iron (Fe), manganese (Mn), chromium (Cr), zirconium (Zr), and titanium (Ti) in addition to silicon (Si), copper (Cu), and zinc (Zn) components. It may include at least one selected from the group containing.

According to one example, the core layer 32 contains 0.1 to 0.3 parts by weight of iron (Fe), 1.0 to 1.5 parts by weight of manganese (Mn), 0.01 to 0.1 parts by weight of chromium (Cr), and 0.01 to 0.01 to 0.01 parts by weight of zirconium (Zr) relative to the total weight of aluminum. It may be made of an aluminum alloy material further containing at least one of 0.1 part by weight and 0.01 to 0.1 part by weight of titanium (Ti). In addition, the filler 36 contains 0.6 to 0.8 parts by weight of iron (Fe), 0.05 to 0.1 parts by weight of manganese (Mn), 0.01 to 0.1 parts by weight of chromium (Cr), and 0.01 to 0.1 parts by weight of zirconium (Zr) relative to the total weight of aluminum. and 0.01 to 0.1 parts by weight of titanium (Ti).

Hereinafter, the properties of each component included in the fin material and the reason for controlling the content of each component will be described in detail.

First, the aluminum alloy material forming the core layer 32 and the filler 36 contains copper (Cu).

As mentioned above, copper (Cu) has a higher potential than zinc (Zn). Therefore, the potential of the aluminum alloy material can be adjusted by adjusting the content of copper (Cu) compared to zinc (Zn). The purpose of the heat exchanger 1 according to the disclosed invention is to protect the tube 10 by adjusting the electric potential to be high in the order of the tube 10, the filler 36, and the core layer 32.

For this purpose, the aluminum alloy material forming the tube 10 may contain the highest content of copper (Cu). In addition, the aluminum alloy material forming the filler 36 may contain a smaller amount of copper (Cu) component than the aluminum alloy material forming the tube 10, and the aluminum alloy material forming the core material is the filler (36). ) may contain a smaller amount of copper (Cu) component than the aluminum alloy material that forms it.

Specifically, the copper (Cu) component contained in the aluminum alloy material forming the tube 10 can be adjusted within the range of 0.2 to 0.3 parts by weight relative to the total aluminum, and is included in the aluminum alloy material forming the filler 36. The copper (Cu) component can be adjusted within the range of 0.1 to 0.25 parts by weight compared to the total aluminum, and the copper (Cu) component contained in the aluminum alloy material forming the core layer 32 of the heat exchange fin 30 is the total amount. It can be adjusted within the range of 0.05 to 0.2 parts by weight compared to aluminum. That is, the copper content of the aluminum alloy material forming the tube 10 may be the highest, and the copper content of the aluminum alloy material forming the core layer 32 may be the lowest.

On the other hand, if the content of copper (Cu) contained in the aluminum alloy material is too high, the potential reversal of the core layer 32 or the filler 36 may occur, and the corrosion resistance of the core layer 32 or the filler 36 may decrease. may deteriorate. Accordingly, the upper limit of the copper (Cu) content contained in the alloy material is adjusted as described above to prevent the formation of a precipitate phase while adjusting the potential of the core layer 32 and the filler 36 as desired. desirable.

Additionally, aluminum alloy materials contain zinc (Zn).

As mentioned above, zinc (Zn) has a lower potential than copper (Cu). Therefore, the potential of the aluminum alloy material can be adjusted by adjusting the content of zinc (Zn) compared to copper (Cu). The principle of controlling the electric potential of an aluminum alloy material by controlling the zinc (Zn) content may be similar to controlling the copper (Cu) content.

The aluminum alloy material forming the tube 10 may contain the smallest amount of zinc (Zn). In addition, the aluminum alloy material forming the filler 36 may contain a larger amount of zinc (Zn) than the aluminum alloy material forming the tube 10, and the aluminum alloy material forming the core layer 32 It may contain a larger amount of zinc (Zn) than the aluminum alloy material forming the filler 36.

Specifically, the zinc (Zn) component contained in the aluminum alloy material forming the tube 10 can be adjusted within the range of 0.05 parts by weight or less relative to the total aluminum, and the zinc contained in the aluminum alloy material forming the filler 36 The (Zn) component can be adjusted within the range of 0.1 to 0.2 parts by weight compared to the entire aluminum, and the zinc (Zn) component contained in the aluminum alloy material forming the core layer 32 of the heat exchange fin 30 is compared to the entire aluminum. It can be adjusted within the range of 2.3 to 2.7 parts by weight.

On the other hand, if the content of zinc (Zn) contained in the aluminum alloy material is too high, the strength of the aluminum alloy fin material may decrease. Therefore, it is desirable to add an appropriate amount of zinc (Zn) to the aluminum alloy material.

Additionally, aluminum alloy materials contain silicon (Si).

Silicon (Si) generally has the property of lowering the melting point of alloy materials. In the heat exchanger 1 according to this embodiment, the clad material of the fin material is melted to form the filler 36, and brazing processing can be easily performed by containing a large amount of silicon (Si) in the clad material. The filler 36 is formed by melting the clad material, and contains a large amount of silicon (Si) like the clad material.

Additionally, depending on the embodiment, the aluminum alloy material may further include iron (Fe).

As mentioned above, the strength of the aluminum alloy material can be increased by adjusting the content of iron (Fe) contained in the aluminum alloy material. However, if the content of iron (Fe) in the aluminum alloy material is too high, the tube 10 Since corrosion resistance may decrease, it is desirable to appropriately adjust the iron (Fe) content. Hereinafter, explanations that overlap with those described above regarding the reason for adding the iron (Fe) component will be omitted.

Additionally, depending on the embodiment, the aluminum alloy material may further include chromium (Cr) or zirconium (Zr).

Chromium (Cr) and zirconium (Zr) can prevent the formation of intermetallic compounds such as Al2Cu and Al3Fe at the grain boundary of the filler 36 material or core material. In other words, it can perform a similar function to the rare earths described above.

However, when a large amount of chromium (Cr) and zirconium (Zr) are added, a certain potential difference can be formed in relation to the aluminum (Al) component. In addition, the strength of the alloy material increases due to the unique properties of chromium (Cr) and zirconium (Zr), and as a result, the extrudability of the aluminum alloy material may decrease. Therefore, taking this into consideration, it is desirable to appropriately adjust the contents of chromium (Cr) and zirconium (Zr).

Additionally, depending on the embodiment, the aluminum alloy material may further include titanium (Ti).

Titanium (Ti) refines the crystals formed in aluminum alloy materials. When crystals formed in an aluminum alloy material are refined, mechanical properties such as strength and tensile strength of the material can be strengthened, and chemical properties such as corrosion resistance can also be strengthened. Therefore, taking this into consideration, it is desirable to appropriately adjust the content of titanium (Ti) contained in the aluminum alloy material.

Hereinafter, FIG. 10 is a diagram illustrating an example of a potential difference design of the heat exchanger 1 according to an embodiment, and FIG. 11 is a diagram illustrating a corrosion process of the heat exchanger 1 according to an embodiment.

Referring to FIG. 10, the heat exchanger 1 according to one embodiment includes the potential Vc of the core layer 32 of the heat exchange fin 30, the potential Vf of the filler 36, and the surface of the tube 10. The potential Vs of and the potential Vt of the tube 10 may be designed to have a relationship of Vt > Vs > Vf > Vc, respectively. At this time, the corrosion potential formed by the galvanic pair of the core layer 32 and the tube 10, that is, the potential difference between Vc and Vt, may range from 50 to 80 mV. Meanwhile, depending on the embodiment, the potential differences between Vt and Vs, Vs and Vf, and Vf and Vc may range from 10 to 30 mV.

Referring to FIG. 11, the core layer 32 of the heat exchange fin 30 may be corroded first due to the potential difference formed as above, and then the filler 36 and the tube surface may be corroded. When corrosion of the core layer 32 progresses, a galvanic pair may be formed between the core layer 32 and the filler 36 or the core layer 32 and the tube 10. In this case, electrons (e-) may move from the core layer 32 to the pillar 36 or from the core layer 32 to the tube 10, and as a result, sacrificial corrosion of the core layer 32 progresses. You can.

If the sacrificial corrosion of the core layer 32 progresses to a certain extent, corrosion of the filler 36 and the surface of the tube may proceed. When corrosion of the filler 36 and the tube surface progresses, a galvanic pair may be formed between the core layer 32 and the filler 36 or the core layer 32 and the tube surface. In this case, electrons (e-) may move from the pillar 36 to the tube 10 or from the tube surface to the inside of the tube 10. In this way, after corrosion of the core layer 32, the filler 36, and the tube surface progresses sequentially, the tube material is finally corroded, thereby protecting the tube material.

[Table 1] below summarizes the composition ratios of components contained in the tube material and fin material of the heat exchanger (1).

division silicon
(Si) steel
(Fe) copper
(Cu) manganese
(Mn) zinc
(Zn) zirconium
(Zr) yttrium
(Y) Fin material core material 0.1-0.6 0.1-0.3 0.05-0.2 1.0-1.5 2.3-2.7 0.01-0.1 - filler material
(clad material) 6.8-8.2 0.6-0.8 0.1-0.25 0.05-0.1 0.1-0.2 0.01-0.1 - Tube material 0.05-0.1 0.05-0.2 0.05-0.3 0.05-0.3 0.05 or less 0.01-0.05 0.05-0.2

Referring to [Table 1], it can be seen that the copper content increases and the zinc content decreases in the order of core material, filler material, and tube material. In other words, it can be seen that the potential is designed to be higher as it moves from the core material to the tube material.

Additionally, it can be confirmed that yttrium can be added to the tube material. In other words, yttrium, one of the rare earth metals, may be added to prevent pitting corrosion that may occur when adding a large amount of copper to the tube material. Depending on the embodiment, of course, zirconium (Zr) may be added to the tube material to prevent corrosion of the fitting.

Above, the heat exchanger 1 according to one embodiment has been described.

The potential difference design method of the heat exchanger according to the disclosed invention is not limited to the heat exchanger 1 of the above-described type. For example, the potential difference design method according to the disclosed invention may also be applied to a folded tube heat exchanger having a rolled tube (outer tube) and folded fin (inner fin) type.

Although embodiments of the disclosed invention have been shown and described above, the disclosed invention is not limited to the specific embodiments described above, and can be understood by those skilled in the art in the technical field to which the disclosed invention belongs without departing from the gist of the claims. Various modifications may be possible.

1: Heat exchanger
10: tube
20a, 20b: header
30: heat exchange fin
32: core layer
34: Clad layer
36: filler
200: air conditioner
300: Outdoor unit
400: indoor unit

Claims (33)

Tube through which refrigerant flows;
Heat exchange fins coupled to the surface of the tube; and
Includes a filler that couples the tube and the heat exchange fin,
The tube is made of an aluminum alloy material containing 0.05 to 0.3 parts by weight of copper (Cu), 0.05 parts by weight or less of zinc (Zn), and 0.05 to 0.2 parts by weight of rare earth metals, based on the total weight of aluminum,
The rare earth metals are,
Contains at least one selected from the group of rare earths including yttrium (Y), lanthanum (La), cerium (Ce), neodymium (Nd), and ytterbium (Yb),
The core layer of the heat exchange fin includes 0.1 to 0.6 parts by weight of silicon (Si), 0.05 to 0.2 parts by weight of copper (Cu), and 2.3 to 2.7 parts by weight of zinc (Zn), based on the total weight of aluminum,
The filler includes 6.8 to 8.2 parts by weight of silicon (Si), 0.1 to 0.25 parts by weight of copper (Cu), and 0.1 to 0.2 parts by weight of zinc (Zn), based on the total weight of aluminum,
In the tube, the filler, and the core layer, the weight portion of copper (Cu) relative to the total weight of aluminum is the highest in the tube and the lowest in the core layer, and the weight portion of zinc (Zn) is lowest in the tube and the core. The highest floor,
The core layer of the tube and the heat exchange fin forms a corrosion potential in the range of 50 to 80 mV,
A heat exchanger formed so that the potential of the core layers of the tube, the filler, and the heat exchange fin is sequentially lowered. According to clause 1,
The aluminum alloy material of the tube is,
A heat exchanger further comprising at least one selected from the group consisting of silicon (Si), iron (Fe), manganese (Mn), and zirconium (Zr). According to clause 2,
The aluminum alloy material of the tube is,
It further contains at least one of 0.05 to 0.1 parts by weight of silicon (Si), 0.05 to 0.2 parts by weight of iron (Fe), 0.05 to 0.3 parts by weight of manganese (Mn), and 0.01 to 0.05 parts by weight of zirconium (Zr) relative to the total weight of aluminum. heat exchanger. delete According to clause 1,
A heat exchanger wherein the heat exchange fins are brazed and welded to the tube. delete According to clause 1,
The heat exchange fins are,
It includes a core layer and a clad layer formed on at least one surface of the core layer,
The filler is,
A heat exchanger formed by melting the clad layer during brazing welding of the heat exchange fin and the tube. delete delete delete delete According to clause 1,
At least one of the heat exchange fin and the filler,
A heat exchanger made of an aluminum alloy material further comprising at least one selected from the group consisting of iron (Fe), manganese (Mn), chromium (Cr), zirconium (Zr), and titanium (Ti). According to clause 12,
The core layer of the heat exchange fin is,
Based on the total weight of aluminum, 0.1 to 0.3 parts by weight of iron (Fe), 1.0 to 1.5 parts by weight of manganese (Mn), 0.01 to 0.1 parts by weight of chromium (Cr), 0.01 to 0.1 parts by weight of zirconium (Zr), and 0.01 to 0.1 parts by weight of titanium. A heat exchanger made of an aluminum alloy material further comprising at least one selected from the group containing (Ti). According to clause 12,
The filler is,
Based on the total weight of aluminum, 0.6 to 0.8 parts by weight of iron (Fe), 0.05 to 0.1 parts by weight of manganese (Mn), 0.01 to 0.1 parts by weight of chromium (Cr), 0.01 to 0.1 parts by weight of zirconium (Zr), and 0.01 to 0.1 parts by weight of titanium. A heat exchanger made of an aluminum alloy material further comprising at least one selected from the group containing (Ti). delete delete delete delete delete delete delete delete delete delete delete delete In an air conditioner including a heat exchanger,
The heat exchanger,
Tube through which refrigerant flows;
Heat exchange fins coupled to the surface of the tube; and
Includes a filler that couples the tube and the heat exchange fin,
The tube is made of an aluminum alloy material containing 0.05 to 0.3 parts by weight of copper (Cu), 0.05 to 0.05 parts by weight of zinc (Zn), and 0.05 to 0.2 parts by weight of rare earth metals,
The rare earth metals are,
Contains at least one selected from the group consisting of yttrium (Y), lanthanum (La), cerium (Ce), neodymium (Nd), and ytterbium (Yb),
The core layer of the heat exchange fin includes 0.1 to 0.6 parts by weight of silicon (Si), 0.05 to 0.2 parts by weight of copper (Cu), and 2.3 to 2.7 parts by weight of zinc (Zn), based on the total weight of aluminum,
The filler includes 6.8 to 8.2 parts by weight of silicon (Si), 0.1 to 0.25 parts by weight of copper (Cu), and 0.1 to 0.2 parts by weight of zinc (Zn), based on the total weight of aluminum,
In the tube, the filler, and the core layer, the weight portion of copper (Cu) relative to the total weight of aluminum is the highest in the tube and the lowest in the core layer, and the weight portion of zinc (Zn) is lowest in the tube and the core. The highest floor,
The core layer of the tube and the heat exchange fin forms a corrosion potential in the range of 50 to 80 mV,
An air conditioner formed so that the potential of the core layer of the tube, the filler, and the heat exchange fin is sequentially lowered. ◈Claim 28 was abandoned upon payment of the setup registration fee.◈ According to clause 27,
The aluminum alloy material of the tube is,
An air conditioner further comprising at least one selected from the group consisting of silicon (Si), iron (Fe), manganese (Mn), and zirconium (Zr). delete delete According to clause 27,
The heat exchange fins are,
It includes a core layer and a clad layer provided on at least one side of the core layer,
The filler is,
An air conditioner having a higher potential compared to the core layer of the heat exchange fin. delete ◈Claim 33 was abandoned upon payment of the setup registration fee.◈ According to clause 27,
At least one of the heat exchange fin and the filler,
An air conditioner made of an aluminum alloy material further comprising at least one selected from the group consisting of iron (Fe), manganese (Mn), chromium (Cr), zirconium (Zr), and titanium (Ti).

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