WO1997042457A1 - Heat exchanger of aluminum alloy - Google Patents

Abstract

A heat exchanger of an aluminum alloy assembled by a brazing method in which a radiator (10) and an oil cooler (11) are put together. A refrigerant tank (13) which covers and tightly encloses the oil cooler is made of an aluminum alloy, the solder for a brazing sheet used for the oil cooler and soldered to the inside of the tank is an aluminum alloy containing more than 7.0 wt.% and not more than 12.0 wt.% of Si, more than 0.05 wt.% and not more than 0.5 wt.% of Fe, more than 0.4 wt.% and not more than 8.0 wt.% of Cu and more than 0.5 wt.% and not more than 10.0 wt.% of Zn, the balance of aluminum and inevitable impurities. Thus, a heat exchanger of an aluminum alloy in which the refrigerant tank is united with the radiator and oil cooler in one body by soldering using the brazing material. This heat exchanger of an aluminum alloy uses a tank of an aluminum material instead of a resin tank, and it is recycled easily. The heat exchanger has a high corrosion resistance and can be fabricated without a tank caulking step.

Description

 Description Aluminum alloy heat exchanger Technical field

 The present invention relates to an aluminum alloy heat exchanger, and more particularly, to an integrated heat exchanger of a radiator and an oil cooler manufactured using an aluminum alloy brazing sheet. Exchanger o Background technology

 A heat exchanger combining a radiator and an oil cooler, as shown in a perspective view in FIG. 4, for example, has a radiator core (10) and an oil cooler (11) (brading sheet (8)). The oil passage (7), which is formed by combining () is simplified in the drawing), and then assembled mechanically with the tank (6).

Here, the radiator consists of a flat tube (3), a thin fin (1), a side support (12) and a header (4) as is apparent from Fig. 5 shown in a perspective view. ) Consisting of a radiator core (10) and a tank (6). In this method, a thin fin (1) processed into a corrugated shape is integrally formed between a plurality of flat tubes (3), and both ends of the flat tube (3) are headers ( 4) and a tank (6), each of which is open to a space (2). From the space on one tank side, the high-temperature refrigerant is passed through a flat tube (3) to form a tank. It is sent to the space (2) on the side of the tank (6), and the refrigerant cooled by the heat exchange between the tube (3) and the fin (1) is circulated again.

 In the assembly of such a part of the rage, the tube material and the header material are made of, for example, JIS 3003 alloy as a core material, and the inner side of the core material, that is, the refrigerant is constantly in contact. On the side, use JIS 707 2 alloy as an inner lining material, and on the outside of the core material, use a brazing sheet made of a brazing material such as JIS 405, which is usually clad. It is manufactured integrally by brazing with other members such as corrugated fins.

 In the oil cooler section (11), the oil passage (7) formed by joining the brazing sheet (8) passes through the space on the tank (2) side, and the high-temperature oil flowing through the passage (7) passes therethrough. It is cooled by the refrigerant liquid passing through the space (2). In such an oil passage, a JIS 3003 alloy or the like is used as a core material, and the outside of the core material, that is, the side that is constantly in contact with the refrigerant liquid, is used as a JIS 707 2 An alloy or the like and a brazing sheet clad with a material such as JIS 405 are usually used inside the core material. Manufactured by brazing with heating to temperature and brazing.

 Thus, both the radiator section and the oil cooler part

Powerful brazing by brazing by heating to a temperature around 600 ° C. The brazing method includes the flux brazing method and the non-corrosive flux. A non-corrosive flux brazing method using a metal is performed.

However, the tank (6) has conventionally been usually formed of a resin material. Therefore, tank installation had to be performed in a separate process from the assembly of the radiator and oil cooler by the brazing method, which had the disadvantage of adding one process. Further, in such a heat exchanger, the fastening portion between the resin tank (6) and the header (4) needs to be strongly caulked via a resin packing (5) or the like. There is a disadvantage that crevice corrosion is likely to occur at the boundary between the bush (5) and the header (4).

 Furthermore, in recent years, the issue of recycling has been attracting attention from the viewpoint of effective use of global resources. The heat exchanger for automobiles is removed at the time of dismantling, and is melted as an aluminum alloy. However, as shown in Fig. 4, if a resin tank is used as the tank (6), it must be removed when dismantling, which is a bottleneck for recycling processing.

Therefore, it is desirable that the tank be made of aluminum alloy and be assembled at the same time by the brazing method. However, after the brazing, the oil cooler is covered with a tank. Therefore, if the brazing of this part is incomplete, it cannot be repaired. Therefore, it was necessary to perform a complete brazing, which was difficult to carry out for the following reasons. That is, since the oil cooler portion was covered with the tank, the temperature during brazing was not sufficiently increased, and brazing defects occurred. In addition, if the temperature is raised sufficiently to prevent brazing problems and ripening occurs, the brazing temperature for the radiator section becomes too high, and the problem of diffusion of brazing to the radiator tube fins occurs. Occurs. Furthermore, in an oil cooler, since the brazing portion is in contact with the coolant liquid, local corrosion is likely to occur due to the potential difference between the brazing portion and the core material portion. This problem ^ solution I can't decide.

 Accordingly, the present invention provides an aluminum alloy heat exchanger that uses aluminum material instead of resin tank, is easy to recycle, has excellent corrosion resistance, and does not require a tank caulking step. aimed to.

 The above and other objects, features and advantages of the present invention will become more apparent from the following description, when considered in conjunction with the accompanying drawings.

 The above object of the present invention has been attained by an aluminum alloy heat exchanger having the following configuration.

 That is, the present invention

(1) A heat exchanger made of aluminum alloy, which is a radiator and oil cooler combined and assembled together by the brazing method, covering the oil cooler The refrigerant tank to be hermetically sealed is made of aluminum alloy, and the brazing sheet brazing material used in the oil cooler and brazed in the tank exceeds 7.0 wt% 12.2 O wt % S i, more than 0.05 wt%, Fe less than 0.5 wt%, more than 0.4 wt% 8.Cu less than O wt%, more than 0.0 δ wt% 10 Using an aluminum alloy containing 0 wt% or less of Zn and the balance of aluminum and unavoidable impurities, the refrigerant tank is blasted integrally with the radiator and oil cooler. Aluminum alloy heat exchanger characterized by being assembled by brazing of brazing material, and (2) An aluminum alloy heat exchanger assembled by the brazing method, combining the radiator section and the oil cooler section, and is a refrigerant that covers and seals the oil cooler section The tank is made of aluminum alloy, and the brazing sheet brazing material used in a part of the oil cooler and attached in the tank is over 7. O wt% 12.0 \ ^ 1 : 5% or less of 5% or less, over 0.05 wt% 0.5% or less of Fe, 0.4% over \ vt% 8.0% or less of Cu, 0% over δwt% Contains not more than 10.0 wt% of Zn, exceeding 0.02 wt% and 0.3 wt%. /. The following In, containing one or two of Sn exceeding 0.02 wt% and 0.3 wt% or less, and the balance consisting of aluminum and unavoidable impurities An aluminum alloy mature exchanger characterized by using an alloy and assembling the refrigerant tank with the radiator part and part of the oil cooler by brazing brazing material.

It provides

 In the present invention, the radiator part and a part of the oil cooler are assembled integrally by one-stage brazing. BRIEF DESCRIPTION OF THE FIGURES

 FIG. 1 is a perspective view, partly in section, showing one embodiment of a radiator and an oil cooler of the present invention in which a radiator and an oil cooler are integrated.

 FIG. 2 is an explanatory diagram illustrating an oil cooler section of another embodiment of the aluminum alloy heat exchanger of the present invention.

FIG. 3 is an explanatory view of an oil cooler portion of still another embodiment of the aluminum alloy heat exchanger of the present invention. 1

6 Fig. 4 is a perspective view of a conventional heat exchanger combining a radiator and an oil cooler.

 FIG. 5 is a perspective view of a conventional radiator. BEST MODE FOR CARRYING OUT THE INVENTION

 Hereinafter, the present invention will be described in detail with reference to the drawings.

 FIG. 1 shows an embodiment (a double-pipe brazing type) of an aluminum alloy heat exchanger which is a heat exchanger integrating a radiator and an oil cooler according to the present invention. Instead of the tank (6), a tank (13) using an aluminum alloy brazing sheet was used, and the header (4) and the tank (13) of the radiator core were assembled. This is done by one additional heat of brazing. Therefore, the conventional packing (5) becomes unnecessary. In the present invention, the tank is made of an aluminum alloy, and the brazing method is used for joining, so that no crevice corrosion occurs between the tank and the header, and the tank is collected as waste. It can be recycled as an aluminum alloy without removing the tank at the time. Also, since all parts are integrated by brazing at once, there is no need for a tank caulking step. In FIG. 1, the same reference numerals as those in FIG. 4 denote the same parts.

The present invention relates to such an integrated heat exchanger, in which a brazing alloy used for an oil cooler (for example, the brazing sheet (8) shown in FIG. 1) has a content of 7. O wt%. Over 12.0 wt% S i, over 0.05 wt% and below 0.5 wt% Fe, over 0.4 wt% and below 8.0 wt% Cu, 0. Contains more than 5 wt% and less than 10.0 wt% Zn, inevitable with the remainder aluminum Aluminum alloy consisting of impurities or more than 0.02 wt% and less than 0.3 wt% In, more than 0.02 wt% and less than 0.3 wt% S Low-temperature brazing aluminum alloys containing one or two of n are used. Such an alloy is an alloy proposed as a low-temperature brazing alloy in Japanese Patent Application Laid-Open No. Hei 7-90442 or the like, but the brazing alloy having such a specific composition is used in the present production method. The reason for using the clad brazing sheet is explained below.

 In the brazing alloy, S i lowers the melting point of the alloy. When the amount is less than 7.0 wt%, the melting point does not sufficiently decrease, and when the amount exceeds 12.0 wt%, the melting point rises conversely, so that the brazing property decreases. In particular, considering the flowability of brazing, an addition amount of 8.0 to 11.0 wt% is desirable.

 Fe is a power that has the function of refining the crystal grains when the wax solidifies after melting and increasing the strength of the fillet.Effective when the amount is less than 0.05 t%, it is fully effective do not do. In addition, Fe forms intermetallic compounds upon solidification, which is the starting point of corrosion. Therefore, the upper limit of Fe content is determined to be 0.5 wt% from the balance between the grain refinement effect and the corrosiveness, and 0.2 wt% or less is desirable from the viewpoint of corrosion resistance.

Cu lowers the melting point of the alloy and improves braze flowability. In addition, Cu has the function of enhancing the external corrosion resistance of the brazing material. The reason is that the oil cooler is required to have external corrosion resistance because the part to which it is attached directly contacts the coolant liquid. Here, from the viewpoint of corrosion resistance, the effect is not sufficient if the Cu content is less than 0.4 wt%. Also, in order to secure stable brazing properties, it is desirable to add Cu in an amount exceeding 1.0 wt%. Also, when the amount of Cu exceeds 8.O wt%, the potential of the wax becomes too noble, Refrigerant passage components become preferentially corroded, lowering corrosion resistance and reducing the rollability of the alloy, making it suitable for use as a brazing sheet for heat exchangers It disappears. Therefore, Cu is more than 1. O wt% and is not more than 8. O wt%. However, considering rollability, it is more preferable to add not more than 4.0 O wt%, especially 0 to 3 wt%. It shows stable characteristics at 5 wt%.

 The addition of Zn lowers the melting point of the alloy and stabilizes the solderability. Further, in the brazing alloy to which Cu is added as in the present invention, the potential of the brazing becomes more noble than the potential of the core, and external corrosion progresses in a pit-like manner, and the speed is high. is there. The addition of Zn in the present invention lowers the potential of the braze, brings the potential of the braze closer to the potential of the core alloy, and improves the corrosion resistance. However, if the amount is less than 0.5 wt%, the effect is not sufficient.If the amount exceeds 10.0 wt%, the self-corrosion resistance of the wax decreases and the rolling workability of the alloy decreases. However, it is not suitable for use as a brazing sheet for heat exchangers. The above is within the scope of the present invention. However, in the present alloy, it is desirable to add Zn in an amount exceeding 2.0 wt% in consideration of brazing flowability, and in consideration of rollability, it is not more than 6.0 wt%. More preferably, the Zn addition amount is 5.0 wt% or less.

 The potentials of In and Sn are made lower to improve the corrosion resistance of the refrigerant passage constituting member. It is added to help the effect of Zn. If the amount is less than 0.02 wt%, the effect is not sufficient, and if the amount exceeds 0.3 wt%, the rollability of the alloy is reduced.

As unavoidable impurities, other elements may be contained as long as the content is 0.30 wt% or less, respectively, but is preferably 0.055 wt% or less. Here, a typical unavoidable impurity is a brazing sheet. 7 57

 Examples include Ni, Cr, Zr, Ti, Mg, etc., which are often added.

 In the present invention, the following brazing material is used instead of the brazing sheet filler material (hereinafter referred to as first and second filler materials) used in the heat exchangers of (1) and (2). (Third to sixth filler materials) can also be used. The above-mentioned first and second brazing materials can be used at a brazing temperature of more than 570 ° C and not more than 585 ° C.

 Hereinafter, this will be described.

 The third filler material for the A1 alloy heat exchanger of the present invention has a Si content of more than 7.0 wt%, less than 12.0 wt%, and a Cu content of more than 0.4 wt% 8. wt% or less, Fe: more than 0.05 wt% and 0.5 wt% or less, and Zn: more than 0.5 wt% to 6.0 \ ^% or less, In: 0. 3 wt% ii (lower (preferably 0.01 to 0.3 wt%), Sn: less than 0.3 wt% (preferably 0.01 to 0.3 wt%) ¾ or two or more

Li: 0 wt% or less (preferably 0.1 to 0.5 wt%), Na: 0.2 wt% or less (preferably 0.003 to 0.1 wt%), K: 0.2 wt% or less (preferably 0.003-0.1 wt%), Ca: 0.2 wt% or less (preferably 0.003 to 0.1 wt%) %), Sr: 0.2 wt% or less (preferably 0.03 to 0.1 wt%), Ba: 0.2 wt% or less (preferably 0.03 to 0. lwt%), B i: 0. 5 wt% or less (and rather is preferred 0 1 ~ 0. 3 wt%) N B e:. 0. 2 wt% or less (preferred and rather are 0.0 0 3 ~ 0.1 wt%), Ni: 0.6 wt% or less (preferably 0.05-0.3 wt%), Cr: 0.2 wt% or less (preferably 1

 Ten

0.03 to 0.1 wt%), Ti: 0.2 wt% or less (preferably 0.003 to 0.1 wt%), Zr: 0.2 wt% or less (preferred) 0.03 to 0.1 wt%), V: 0.2 wt% or less (preferably 0.003 to 0.1 wt%), G a: l.O wt% or less (preferred) 0.3 to 0.9 wt%), and Ge: 2.0 wt% or less (preferably 0.2 to 1.9 wt%). The remainder is composed of A1 and unavoidable impurities, and is an A1 alloy brazing material, and the fourth brazing material for the A1 alloy heat exchanger of the present invention is an alloy having the above composition, A1 alloy brazing material characterized by containing Mn: more than 0.05 wt% and not more than 1.2 wt%. Next, the fifth filler metal for the A1 alloy heat exchanger of the present invention has a Si content of more than 7.0 wt% and 12.0 wt% or less, and a Cu content of more than 0.4 wt%. 8.0 wt% ¾T, Fe: more than 0.05 wt% and not more than 0.5 wt%, Ga: 1.0% or less, Ge: 2.0 wt% or less One or two of these, and

 L i, Na, K, C a, S r, B a, B i, B e, N i, C r, T i, Z r, V One or more of L, L i: 1.0 wt% or less, Bi: 0.5 wt% or less, Ni: 0.6 wt% or less, Na, K, Ca, Sr, Ba, Be, Cr, Ti, Zr, V: A1 alloy brazing material characterized by containing 0.2 wt% or less and the balance consisting of A1 and unavoidable impurities.

 The sixth brazing filler metal for the A1 alloy heat exchanger of the present invention has the alloy of the above composition further containing Mn: more than 0.05 wt% and 2 wt% or less. It is an A 1 alloy brazing material characterized by

In the fourth to sixth roaming materials, G a, G e, L i, N a, K, The preferred contents of Ca, Sr, Ba, Bi, Be, Ni, Cr, Ti TZr, and V are the same as those of the third brazing material.

 In terms of the technical significance and action of the third to sixth brazing alloy compositions, the same components as those of the first and second brazing materials are the same as those described above.

 The addition of Ga and Ge makes the potential of the brazing lower, and the sacrificial anode effect improves the corrosion resistance of the refrigerant passage constituting member. The addition of Ga and Ge lowers the potential of the braze to which Cu is added, brings the potential of the braze closer to the potential of the core alloy, and improves the corrosion resistance. Zn, In, and Sn can be added to help the effect, or can be added instead of these. If the content exceeds 1.0 wt% for Ga and 2.0 wt% for Ge, the self-corrosion resistance of the braze decreases and the rollability of the alloy may decrease.

 Li, Na, K, Ca, Ba, Sr, Be, and Bi form brittle oxides or low-melting compounds on the surface of Al alloy brazing material, facilitating the destruction of oxide films. By doing so, the flowability of the wax is improved and the brazing performance is improved. Rolling of the alloy when it exceeds 1.0 wt% for Li, 0.5 wt% for Bi, and 0.2 wt% for Na, K, Ca, Sr, Ba and Be respectively Performance may be reduced.

Mn, Ni, Cr, Ti, Zr and V form an intermetallic compound when the brazing solidifies after melting, and have the function of increasing the strength of the brazed portion. However, the effect may not be sufficient if Mn is 0.05 wt% or less, and 1.2 wt% for Mn, 0.6 wt% for Ni, Cr, Ti, Z If each of r and V exceeds 0.2 wt%, the rollability of the alloy may decrease. In the present invention, similarly to the first and second brazing materials, the third to sixth brazing materials for A-alloy heat exchangers have a brazing temperature exceeding 570 ° C and 585 ° C. It is possible to: This is suitable as a brazing material for heat exchangers in which a radiator and an oil cooler are assembled together.

 The above is the reason for limiting the components of the brazing alloy for the brazing sheet of the oil cooler used in the present invention, but the core alloy is not particularly limited. Usually, an aluminum alloy used for a brazing sheet may be used. However, it is preferable to adjust the Zn content and the Cu content of the brazing material to improve the corrosion resistance, and to make the potential (natural potential) difference between the brazing material and the core material 100 mV or less. If necessary, the brazing sheet may be a three-layer brazing sheet coated with a sacrificial material. The brazing material clad ratio in the brazing sheet is not particularly different from the normal brazing material, and the amount is not limited. It is only necessary that the brazing material be sufficiently clad so that joining by brazing can be sufficiently performed.

 In the A1 alloy heat exchanger of the present invention, the aluminum alloy for the radiator and the tank is not particularly limited. Any commonly used aluminum alloy and aluminum alloy brazing sheet, and a brazing sheet using the material used for the oil cooler of the present invention can be used.

Here, the brazing conditions employed in the present invention may be ordinary conditions under which the radiator can be brazed without problems. That is, the method is not particularly limited as long as it is a flux brazing method, a non-corrosive flux brazing method using a non-corrosive flux, or the like. Assembly before brazing, washing, and in some cases, application of flux may be performed as usual. In the present invention, the type of the aluminum alloy heat exchanger is not particularly limited except that it is an integrated type of a radiator and an oil cooler, and various types can be used. Examples are shown in FIGS. 2 and 3. Fig. 2 shows a double-tube oil cooler with an inner tube and an outer tube. In the figure, the radiator core is basically the same as that in FIG. 1 and is omitted. In the figure, (14) is a tubular oil cooler, which is composed of an inner pipe (15) and an outer pipe (16). (19) shows a tank made of aluminum alloy. Figure 1 and the same sign show the same thing. (17) indicates a pipe, and (18) indicates a connector. As shown in the figure, the aluminum alloy tank (19) becomes the brazing sheet force and is brazed integrally to the header plate (4). Here, the inside of the outer pipe (16) is the filler material having the specific composition according to the present invention. Fig. 3 shows a part of the oil cooler of another example, which is a multi-plate type. In the figure, (20) is an oil cooler, (21) is an inner fin, (22) is a tube plate, and (23) is an aluminum made of brazing sheet. It is a tank made of a nickel alloy, and in FIG. 3, the same reference numerals as in FIG. 2 denote the same parts. In the figure, the tube plate (22) is a brazing sheet car in which the specific brazing material according to the present invention is clad inside. In this figure, the tank (23) is attached to the header plate (4). Example

Hereinafter, the present invention will be described specifically with reference to Examples. It goes without saying that the present invention is not limited to this embodiment.

Example 1

 First, examples of the first and second brazing materials will be described. A radiator and oil cooler with the structure shown in Fig. 1 were manufactured under the heating conditions of 600 ° C for 5 minutes, with a body made of an aluminum alloy brazier sheet. Packing is not used. Table 1 shows the materials for the radiator. The tubes of the radiator were subjected to ERW and the tubes shown in Table 1 were used as tubes. The oil cooler used was a brazing sheet with the following composition. The composition is as follows: A 1-0.5 wt% S i-0.3 wt% Fe-0.5 wt% Cu-1. lwt% Mn alloy is used for the core material, and A 1 — 2 wt% Zn alloy was used as the sacrificial material, and the brazing alloys shown in Table 2 were used inside the core material. It is formed by pressing a 0 temper plate with 0.6 τηπι.

An oil cooler was cut out of the obtained heat exchanger, and a leak test and a corrosion resistance test were performed.

Five

 Table 2

(wt%) In the corrosion resistance test, a part without leakage failure was cut out from the oil cooler, the end was masked, and it was immersed in tap water added with Cu ² -ion to a concentration of 1 Oppm for 5 power months, and 8 A cyclic corrosion test was performed at 0 ° C for 8 hours and at room temperature for 16 hours, and the state of corrosion around the brazing portion was examined by cross-sectional observation.

 Table 3 shows the results. Table 3

 Oil cooler 11 Corrosion test result

 No.Leak test result

 A 1 No leakage failure.

 Light

 Example B 1 No leakage failure No pitting corrosion

 Λ C 1 No leaking 筻 No pitting

 Real

 No good No pitting corrosion

 Out D 1 No leak

 E 1 No leakage failure な し No pitting corrosion

 V

 F 1 Re-Ora No Tsuru S No pitting

 Ratio G 1 No leakage failure Through-hole corrosion

 H 1 Leakage failure occurred No pitting corrosion

 I 1 ¾5 Defective 'Yoshi

 J 1 Leakage failure Raw 1

1 1 Leakage failure occurred 1 piece]! Pitting corrosion occurred In Examples A1 to F1, is the oil cooler section a header tank? ! As a result, the temperature reached during brazing is lower than 600 ° C and is between 570 ° C and 585 ° C, but low-temperature brazing filler metal is used in this part. Therefore, the oil cooler is well brazed and no leakage failure has occurred. In each of the examples, the potential difference between the brazing alloy and the core material alloy is within 100 mV. Therefore, no pitting corrosion occurred in the corrosion test.

 On the other hand, the brazing of the oil cooler is completely completed in Comparative Example H1 in which the amount of Si is smaller than the range of the present invention and in Conventional Examples J1 and K1 which do not contain Cu and Zn. No test was performed and leaks were found in the leak test.

 Further, in Comparative Examples G 1 and I 1 and Conventional Examples J 1 and K 1, which are out of the range of Cu and Zn of the present invention, the potential difference from the core material exceeded 100 mV. Therefore, corrosion pitting occurred in the corrosion test. Example 2

 Here, examples of the third to sixth brazing materials will be described.

A brazing alloy having the composition shown in Tables 4 and 5 was used as a core material (A 1-0.27 wt% S i-0.42 wt% Fe-1.1 wt% M n-0.52 wt % Cu alloy) and a brazing sheet with a thickness of 0.50 mm was created. The tempering of the brazing sheet is H14 and the wax cladding rate is 10%. Table 4

S 5

 A 1 Composition of alloy brazing material (wt%)

 Number

 S i C u F e Z n I n S n G a G e M n A 1

0 2 10. 4 2.25 0.19 2.04 0.66 Zr 0.05 Remaining

P 2 10. 4 2.25 0.19 1.67 1.52 V 0.09 Remaining

Q 2 10. 4 2.25 0.19 0.87 L i 0.22 Remaining

 R 2 10.4 2.25 0.19 0.66 Ca 0.15 Residual

 S 2 10.4 2.25 0.19 4.05 0.30 L i 0.53 residual

 τ 2 10. 4 2.25 0.19 4.05 0.61 Sr 0.19 Remaining

U 2 10. 4 2.25 0.19 0.81 0.30 L i 0.72 Remaining

V 2 10.4 2.25 0.19 1.85 0.81 Be 0.17 Residual ratio a 5.3 0.91 0.28 2.30 remaining b 10.4 0.19 4.30 remaining The blazing sheet was heated at the brazing temperatures shown in Tables 6 and 7 and subjected to the following brazing test.

The lower plate is a brazing sheet, and the upper plate is 0.5 mm thick A1-1.2 wt% Si-0.25 wt% Fe-0.4 wt% Cu-1. lwt % Mn alloy—As an H14 material, assemble as a T-junction, apply a liquid containing a 10% concentration of calcium fluoride-based flux, and apply N _By heating in _two gases and brazing, 50 T-Joints were prepared for each. By observing the appearance, the number of wax breaks in the T-Joint was investigated. In addition, as a strength test of the brazed portion, a tensile test was performed on a T-joint that had been brazed correctly, and the fracture position was investigated.

The above results are shown in Table 6 and Table 7.

Table 6

 (Note) * Standard for brazing

 Pass: Number of T-Joints with cross-cut ≤ 6 Fail: Number of T-Joints with cross-cut> 6 * * Fillet strength

 〇: T joint base material fracture

X: T joint breakage Table 7

 (Note) * Standard for brazing

 Pass: Number of T-Joint with cross-section ≤ 6 Fail: Number of T-Joint with cross-section> 6 ** Fillet strength

 〇: T joint base material fracture

 X: Joint breakage

From Tables 6 and 7, it can be seen that, according to Examples A2 to V2 of the present invention, good brazing properties are exhibited even at a lower temperature of 575 ° C than in the past. Therefore, according to this brazing material, even when the oil cooler portion is covered with the evening water and brazing temperature does not rise sufficiently, no brazing failure occurs and the radiator portion and the oil cooler portion are not damaged. Al that combines The heat exchanger made of mini alloy can be assembled well. Industrial applicability

 Since the heat exchanger manufactured according to the present invention does not use a resin tank, the heat exchanger is easily recycled, has excellent corrosion resistance, and does not require a tank caulking step. The present invention has been described with embodiments thereof, but we do not intend to limit our invention in any detail of the description unless otherwise specified, but set forth in the appended claims. It should be construed broadly without violating the spirit and scope of the invention.

Claims

The scope of the claims  1. An aluminum alloy heat exchanger assembled by the brazing method, combining a radiator and an oil cooler, and a refrigerant tank that covers part of the oil cooler and hermetically seals it. Is made of an aluminum alloy, and the brazing sheet material used in the oil cooler and attached in the tank has a Si content of not less than 7.0% and not more than 12.2 wt%. Fe over 0.05 wt%, below 0.5 wt% li, Cu over 0.4 wt%, up to 8.0 wt%, Cu over 0.5 wt%, up to 10.0 wt% Using an aluminum alloy containing the remaining Zn and the balance aluminum and unavoidable impurities, and brazing the coolant tank together with the radiator and oil cooler parts with brazing material An aluminum alloy heat exchanger characterized by being assembled by  2. The aluminum alloy according to claim 1, wherein the refrigerant tank is brazed to a header plate of the radiator part without using packing. Heat exchanger.  3. The aluminum alloy according to claim 1, wherein the heat exchanger is a double-pipe brazed heat exchanger, an internal / external double-pipe heat exchanger, or a multi-plate heat exchanger. Heat exchanger. 4. An aluminum alloy heat exchanger that is assembled as a unit by the brazing method, combining a part of the rage and part of the oil cooler. The tank is made of aluminum alloy, and the brazing sheet material used in the oil cooler and sunk in the tank is more than 700 wt% and not more than 12.0 wt% Of Si exceeds 0.05 wt% and 0.5 wt% or less The lower Fe contains more than 0.4 wt%, less than 8.0 wt% Cu, more than 0.5 wt%, less than 10.0 wt% Zn, and 0.02 wt% In excess of 0.3 wt% and less than 0.3 wt%, contains one or two of Sn in excess of 0.02 wt% and less than 0.3 wt%, and is inevitable with the balance aluminum A heat exchanger made of aluminum alloy, characterized by using an aluminum alloy consisting of impurities and assembling the coolant tank together with the radiator and oil cooler by brazing brazing material. vessel.  5. The aluminum alloy according to claim 4, wherein the refrigerant tank is attached to the header plate of the radiator part without using packing. Heat exchanger. 6. The aluminum according to claim 4, wherein the heat exchanger is a double-pipe brazed heat exchanger, an internal / external double-pipe heat exchanger, or a multi-layer heat exchanger. Alloy heat exchanger. 7. In place of the brazing material described in claim 1, S i: more than 7.0 wt% and 12.0 wt ^Q /. Hereinafter, Cu: contains more than 0.4 wt% to 8.0 wt% or less, Fe: contains more than 0.05 wt% to 0.5 wt% or less, and furthermore, Zn: 0.5 wt%. Over 6.0 wt%, In: 0.3 wt% or less, Sn: 0.3 wt% or less. Li: 1.0 wt% or less, Na: 0.2 wt% or less, K: 0.2 wt% or less, Ca: 0.2 wt% or less, Sr: 0.2 wt% or less, Ba : 0.2 wt% or less, B i: 0.5 wt% or less, Be: 0.2 wt% or less, Ni: 0.6 wt% or less, Cr: 0.2 wt% or less, T i : 0.2 wt% below, Zr: 0.2 wt% or less, V: 0.2 wt% or less, G a: l. O wt% or less, Ge: 2.0% or less, containing one or more of the following, with the balance being aluminum and unavoidable impurities An aluminum alloy heat exchanger characterized by using an alloy as a brazing material. 8. In place of the brazing filler metal according to claim 1, Si: more than 7.0 wt%, 12.2 wt% or less, Cu: more than 0.4 wt%, 8.0 wt% ¾ T, Fe: more than 0.05 wt% and 0.5 wt% or less, Mn: more than 0.05 wt% and 1.2 wt% or less, and Zn: 0.5 wt% % Or more, 6.0% or less, ln: 0.3 wt% below J ^, Sn: 0.3 wt% or less. L i: 1.0 wt% or less, Na: 0.2 wtQ or less, K: 0.2 wt% or less, Ca: 0.2 wt% or less, Sr: 0.2 wt% or less, B a: 0.2 wt% or less, Bi: 0.5 wt% or less, Be: 0.2 wt% or less, Ni: 0.6 wt% or less, Cr: 0.2 wt% or less, T i: 0.2 wt% or less, Zr: 0.2 wt% or less, V: 0, 2 wt% or less, Ga: 1.0 wt% or less, Ge: 2.0 ^% or less A heat exchanger made of aluminum alloy, characterized in that one or two or more kinds are used, and an aluminum alloy consisting of aluminum and unavoidable impurities is used as a brazing filler metal. 9. In place of the brazing filler metal according to claim 1, Si: more than 7.0 wt%, not more than 12.0 wt%, Cu: more than 0.4 wt%, not more than 8. Owt%. , Fe: contains more than 0.05 wt% and 0.5 wt% or less, and furthermore, one or two of Ga: 0.1% or less, and 06: 2.0 wt% or less. Containing seeds, L i: below 1.0 wt%, Na: below 0.2 wt%, K: 0.2 wt% or less, Ca: 0.2 wt% or less, Sr: 0.2 wt% or less, Ba: 0.2 wt% or less, Bi: 0.5 wt% or less, Be: 0.2 ^ 1;% or less, 1 ^ 1: 0.6 wt% or less, Cr: 0.2 wt% or less, Ti: 0.2 wt% or less, Zr: 0.2 wt% or less, V: 0 An aluminum alloy heat exchanger characterized in that it contains one or more of 2 wt% or less, and uses an aluminum alloy consisting of aluminum and unavoidable impurities as a brazing filler metal. .  10. In place of the brazing material described in claim 1, S i: more than 7.0 wt%, 12.2 wt% or less, Cu: more than 0.4 wt%, 8.0 wt% or less ,? 6: more than 0.05 wt%, less than 0.5 wt%, Mn: more than 0.05 wt%, less than 1.2 wt%, and G a: 1.0: less than 1% , Containing one or two of the following components:  L i: 1.0 wt% or less, Na: 0.2 wt% or less, K: 0.2 wt% ¾T, Ca: 0.2 wt% or less, Sr: 0.2 wt% or less, B a: 0.2 wt% or less, Bi: 0.5 wt% or less, Be: 0.2 wt% or less, Ni: 0.6 wt% or less, Cr: 0.2 wt% or less, T i: 0.2 wt% or less, Zr: 0.2 wt% or less, V: 0.2 wt% or less, containing one or more of the remaining aluminum and unavoidable impurities An aluminum alloy heat exchanger characterized by using an aluminum alloy made of a brazing material.