JP3267765B2 - Heat exchanger - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger made of, for example, aluminum or aluminum alloy (hereinafter, simply "aluminum alloy") for automobiles.

[0002]

BACKGROUND OF THE INVENTION For example, heat exchangers such as radiators, heater cores, intercoolers and oil coolers are shown in FIG.
Has a configuration as shown in FIG. In FIG. 1, 1 is a side support, 2 is a tube (flat electric resistance welded tube), 3 is a corrugated fin, and 4 is a tank. The side support 1 is formed using a brazing sheet having one side clad with an Al-Si-Mg brazing material, and the tube 2 is also formed with a brazing sheet having one side clad with an Al-Si-Mg brazing material. 2 is used, and after assembling as shown in FIG. 1, the side support 1 and the corrugated fin 3 are provided on one side of the side support 1 by vacuum brazing. The tube 2 and the corrugated fin 3 are brazed with the brazing material provided on the outer surface of the tube 2, and the side support 1 and the corrugated fin 3, and the tube 2 and the corrugated fin 3 are brazed. Each part is joined (brazed).

[0003] However, in the heat exchanger configured as described above, the corrugated fins 3 are sometimes damaged.

[0004]

DISCLOSURE OF THE INVENTION As the research on the above problems has been earnestly promoted, it has been found that the damage to the corrugated fins 3 is caused by the brazing material. That is, as a result of the brazing material clad on the side support 1 and the tube 2 being heated to the brazing temperature and melting, the melted brazing material drips down and accumulates under the action of gravity, and the amount of the dripping stagnant increases. When it came, it turned out that a large amount of molten brazing material would melt the aluminum alloy fins. In particular, for example, the thickness of the brazing material clad on the side support 1 is 80 to 200 μm,
The thickness of the brazing material clad in the tube 2 is 20 to
Since the brazing material clad on the side support 1 is larger than the brazing material clad on the tube 2 such as 40 μm, the amount of the brazing material that hangs down and accumulates on the side of the side support 1 is large. It has also been found that the corrugated fins 3 have been greatly damaged.

The present invention has been accomplished based on such findings, and an object of the present invention is to provide a brazing property between a tube for a working fluid passage and a fin, and to dispose the tube outside the tube. An object of the present invention is to provide a high-performance heat exchanger with excellent brazing characteristics between a side support and a fin with a high production yield. The purpose of this invention is to
A tube of working fluid passages which are more provided, wherein
More brazing material is provided by cladding than tube brazing material.
Vignetting have, includes a side support disposed outside the tube, between the tube and the tube, and a fin disposed between said <br/> tube and side support, said tube and the side support and the fins a heat exchanger formed by vacuum brazing, the rhino
The fluidity of the brazing material that is clad on the metal support and used for brazing the side support and the fins is as described above.
This is achieved by a heat exchanger characterized in that a brazing material clad in the tube and having a lower fluidity than the brazing material used for brazing the tube to the fins is used.

The tube and the side support are made of Al-
It is preferable that the brazing sheet is formed by cladding a Si-Mg-based brazing material, and the Si content of the brazing material in the tube is larger than the Si content of the brazing material in the side support. For example, the brazing material in the tube has a Si content of 8.5 to 8.5.
11.0 wt%, Mg content is 0.2 to 2.0 wt%,
The rest is aluminum and aluminum alloy of inevitable impurities,
The brazing filler metal in the side support has a Si content of 6.5 to 6.5.
It is preferable to use 8.5 wt%, Mg content of 0.2 to 2.0 wt%, and the balance being Al and aluminum alloy of unavoidable impurities.

[0007] In particular, the brazing material in the tube has a Si content of 8.5 to 11.0 wt% and a Mg content of 0.2 to 1%.
2.0 wt%, the remainder is aluminum alloy of Al and unavoidable impurities. The brazing filler metal in the side support has a Si content of 6.5 to 8.5 wt% and a Mg content of 0.2 to 0.2.
2.0 wt%, the balance being Al and aluminum alloy of unavoidable impurities, and the following formula: 0.1 × t ₀ / t ₁ ≦ C ₁ −C ₀ ≦ 1.2 × t ₀ / t ₁ It is preferable that the thickness of the brazing material is t ₁ , the content of Si is C ₁ %, the thickness of the brazing material in the side support is t ₀ , and the content of Si is C ₀ %]. It should be noted that, here, t ₀ is about 80 to 20
0 μm, side support thickness is about 1.0-2.0 m
m and t ₁ are generally about 20 to 40 μm, and the thickness of the tube is generally about 0.2 to 0.5 mm.

The brazing filler metal used in the above is 0.2 w
Bi of t% or less, Be of 0.005 wt% or less, 0.7
It may contain one or two or more wt% Fe. Hereinafter, the present invention will be described with reference to specific examples.

[0009]

EXAMPLES A brazing sheet was used in which an Al-Si-Mg-based brazing material composed of the alloy components shown in Table 1 below was clad on one surface of an alloy 3003.
A side support having a thickness of 5 mm (the thickness of the brazing material is 80 to 200 μm), and a brazing sheet formed by cladding an Al-Si-Mg-based brazing material comprising an alloy component shown in Table 2 below on one surface of an alloy 3003 A tube having a thickness of 0.4 mm (the thickness of the brazing material was 20 to 40 μm) constituted by using the above method was prepared.

Table 1 No. Brazing filler metal component of side support (wt%) Brazing filler metal thickness (μm) Si Mg Bi Be Fe Al 1 6.5 1.5--0.25 Remaining 140 2 6.5 1.4 0.11 0.002 0.20 Remaining 130 3 7.0 1.2-- 0.15 Remaining 150 4 7.0 1.3 0.01 0.0001 0.20 Remaining 160 5 7.5 1.2--0.20 Remaining 60 6 7.5 1.1 0.12 0.0001 0.65 Remaining 180 7 8.0 0.3--0.30 Remaining 130 8 8.0 1.8 0.01 0.0001 0.35 Remaining 120 9 8.5 0.9--0.25 Remaining 80 10 8.5 0.9 0.01 0.0001 0.20 Remaining 190 11 5.5 1.0--0.25 Remaining 130 12 9.5 1.1 0.01 0.0001 0.20 Remaining 140 Table-2 Brazing filler metal component of No tube (wt%) Brazing filler metal thickness (μm) Si Mg BiBe Fe Al 1 8.5 1.3--0.30 Remaining 30 2 8.5 1.2 0.14 0.0001 0.25 Remaining 30 3 9.0 1.1--0.35 Remaining 30 4 9.0 1.0 0.01 0.004 0.30 Remaining 30 5 9.5 1.5- − 0.20 Remaining 20 6 9.5 1.6 0.01 0.0001 0.20 Remaining 40 7 10.0 0.9 − − 0.15 Remaining 30 8 10.0 0.8 0.01 0.0001 0.65 Remaining 30 9 10.5 0.3 − − 0.25 Remaining 30 10 10.5 1.9 0.01 0.0001 0.20 Remaining 30 11 11.0 1.3 0.01 0.0001 0.20 Remaining 20 12 11.0 1.2 0.01 0.0001 0.20 Remaining 40 13 5.0 1.3--0.25 Remaining 30 14 8.0 1.3--0.20 Remaining 30 And the side support of No1 to No12 above, No
1 to No. 14 tubes and corrugated fins are shown in FIG.
Then, vacuum brazing (vacuum degree 5 × 10 ⁻⁵ To
(rr, temperature: 600 to 610 ° C., time: 5 minutes), the side support and the corrugated fin, and the tube and the corrugated fin were bonded (brazed) at each joint.

With respect to the heat exchanger thus obtained, the brazing property at the joint between the side support and the fin and the degree of damage to the corrugated fin were examined, and the results are shown in Table-3. Table-3 Side support tube C ₁ -C ₀ t ₀ / t ₁ Brazing Support part Damage condition Port No No Temperature ℃ Brazing property Example 16 5 2.0 9.0 600 600 Good None Example 2 5 6 2. 0 2.1 600 Good None Example 3 3 3 2.0 5.0 600 600 Good None Example 4 7 11 3.0 6.5 6.5 600 Good None Example 5 13 2.5 2.5 4.6 600 Good None Performed Example 6 2 2 2.0 4.3 600 Good N / A Example 7 2 4 2.5 4.3 600 Good N / A Example 8 4 10 3.5 5.3 600 600 Good N / A Example 9 8 10 2.5 4 0.0 600 Good None Example 10 11 11 4.5 7.0 600 Good None Example 11 93 3 0.5 2.6 600 Good None Example 12 8 3 1.0 4.0 600 Good None Example 13 1 1 2.0 4.7 600 Good None Example 1 4 7 7 2.0 4.3 600 Good None Example 15 15 9 9 2.0 6.3 600 Good None Example 16 10 12 3.5 4.8 600 600 Good None Comparative Example 1 12 1 -1.0 4 0.7 600 Insufficient Very bad Comparative example 2 123 -0.5 4.7 600 Insufficient Very bad Comparative example 3 12 500 7.0 600 Good Very bad Comparative example 4 11 13 -0.54 3.3 610 Insufficient None Comparative Example 5 313 −2.0 5.0 610 Good Bad Comparative Example 6 8 14 0 4.0 600 Good Very poor According to this, the heat exchanger according to the present invention has a side support. It can be seen that they have excellent brazing properties at the joint portions between the corrugated fins and the tube and the corrugated fins, and do not generate defective products such as melting of the corrugated fins.

[0012]

[Effect] A high-performance heat exchanger with excellent brazing characteristics between a tube for a working fluid passage and a fin and brazing characteristics between a side support and a fin can be obtained with a high production yield.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a heat exchanger.

FIG. 2 is a sectional view of a tube.

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Mitsuru Iizuka 31-2, Sakuragaoka-cho, Shibuya-ku, Tokyo Inside Toyo Radiator Co., Ltd. (56) References JP-A-2-127992 (JP, A) Shokai Sho60 −56168 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F28F 9/00-9/26 C23C 2/12 C23C 2/34

Claims (4)

(57) [Claims] 1. A tube for a working fluid passage in which a brazing material is provided by a clad, and a brazing material more than the brazing material of the tube is provided by the cladding.
And a fin disposed between the tube and the tube , and between the tube and the side support, wherein the fin is disposed between the tube and the side support. A fin and a heat exchanger formed by vacuum brazing, which are clad on the side support, and the fluidity of the brazing material used for brazing the side support and the fin is clad on the tube, A heat exchanger characterized by using a brazing material having a lower fluidity than that of a brazing material used for brazing to a fin. 2. The tube and side support are made of Al-S
It is composed of a brazing sheet clad with an i-Mg-based brazing material, and the S of the brazing material in the tube is formed.
The heat exchanger according to claim 1, wherein the i content is larger than the Si content of the brazing filler metal in the side support. 3. The brazing material in the tube has a Si content of 8.5 to 11.0 wt% and a Mg content of 0.2 to 2.0%.
wt%, the balance being an aluminum alloy of Al and unavoidable impurities. The brazing filler metal in the side support has a Si content of 6.5 to 8.5 wt% and a Mg content of 0.2 to 2.0 w.
The heat exchanger according to claim 1 or 2, wherein t% and the balance are aluminum and an aluminum alloy of unavoidable impurities. 4. Bi, which contains 0.2% by weight or less of brazing filler metal.
005 wt% or less of Be and 0.7 wt% or less of Fe
Claims characterized by comprising two or more species
Item 4. The heat exchanger according to item 2 or 3.