JP6867820B2 - Heat exchanger - Google Patents

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JP6867820B2
JP6867820B2 JP2017023391A JP2017023391A JP6867820B2 JP 6867820 B2 JP6867820 B2 JP 6867820B2 JP 2017023391 A JP2017023391 A JP 2017023391A JP 2017023391 A JP2017023391 A JP 2017023391A JP 6867820 B2 JP6867820 B2 JP 6867820B2
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brazing
heat exchanger
flat tube
convex portions
members
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JP2018126785A (en
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太田 博巳
博巳 太田
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T.RAD CO., L T D.
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Description

本発明は、ろう付において、部分的にろう材による部材どうしの接合を防止する接合防止剤に関する。 The present invention relates to a bonding inhibitor that partially prevents members from being bonded to each other by a brazing material in brazing.

ろう付において、部分的にろう材による部材どうしの接合を防止するものとして、下記特許文献1に記載のものが提案されている。これは、一対のプレート間に部分的な接合防止層を形成し、その接合防止層の厚さで部分的な漏洩流体排出用通路を形成して、漏洩流体を通路から確実に外部に排出するものである。 In brazing, the one described in Patent Document 1 below has been proposed as a means for partially preventing the members from being joined to each other by the brazing material. This forms a partial anti-junction layer between the pair of plates, and the thickness of the anti-junction layer forms a partial leak fluid discharge passage to ensure that the leak fluid is drained out of the passage. It is a thing.

特開2001−99587号公報Japanese Unexamined Patent Publication No. 2001-99587

これに対して、本発明の目的は、複数の部材どうしをろう付で接合した際に、意図せずに不必要な部分までろう付され、部材に加わる振動や熱応力等の外力により当該部分に応力集中が生じ、亀裂等の損傷が生じることを防止することである。 On the other hand, an object of the present invention is that when a plurality of members are brazed to each other, an unnecessary portion is unintentionally brazed, and the portion is subjected to an external force such as vibration or thermal stress applied to the member. This is to prevent stress concentration from occurring and damage such as cracks.

請求項1に記載の本発明は、複数の部材間のろう付接合において、各部材の一部の接合を防止するために白色顔料を含有する接合防止剤を用いると共に、各部材間をろう付により接合した熱交換器であって、
熱交換器を構成する隣接部材の各対向位置に凸部が形成され、その凸部に前記接合防止剤が塗布された状態で、各部材間がろう付され、前記接合防止剤が塗布された凸部間が非接合状態にある熱交換器である。
According to the first aspect of the present invention, in brazing joining between a plurality of members, a joining inhibitor containing a white pigment is used to prevent the joining of a part of each member, and the brazing between the members is performed. It is a heat exchanger joined by
Convex portions were formed at each facing position of the adjacent members constituting the heat exchanger, and with the convex portions coated with the anti-bonding agent, the members were brazed and the anti-bonding agent was applied. It is a heat exchanger in which the protrusions are in a non-bonded state .

請求項1に記載の発明のように、ろう付における接合防止剤を白色顔料を含有するものとしたので、高温でも安定でかつろうとの親和性が無い白色顔料成分によって、白色顔料が塗布された部材間に溶融したろう材が流入することが防止され、また、白色顔料が介在することにより当該部材間がろう付時の加熱または加圧によって拡散接合されることも防止される。これらにより、当該部材間において確実な接合防止効果を得ることが可能となる。 As in the invention of claim 1, since the bonding inhibitor for brazing contains a white pigment, the white pigment is applied by a white pigment component that is stable even at high temperatures and has no affinity for brazing. It is possible to prevent the molten brazing material from flowing between the members, and it is also possible to prevent the members from being diffusely joined by heating or pressurizing during brazing due to the presence of the white pigment. As a result, it is possible to obtain a reliable bonding prevention effect between the members.

さらに前記白色顔料を含有する接合防止剤を用い、熱交換器を構成する隣接部材において対向する凸部間の接合が防止されることにより、ろう付によって意図しない局所的な接合部が生じることが防止され、当該接合部に外力に対する応力が集中し、当該接合部が損傷することが防止される。
Further , by using the bonding inhibitor containing the white pigment to prevent bonding between opposing convex portions in the adjacent members constituting the heat exchanger, brazing causes an unintended local bonding portion. Is prevented, stress against an external force is concentrated on the joint, and the joint is prevented from being damaged.

本発明のろう付における接合防止剤11が適用される熱交換器の第1実施例を示す分解斜視図。The exploded perspective view which shows the 1st Example of the heat exchanger to which the bonding inhibitor 11 in brazing of this invention is applied. 同縦断面図。The same vertical sectional view. 同接合防止剤11の塗布状態を示す説明図。The explanatory view which shows the coating state of the bonding inhibitor 11. 図2におけるIV部拡大図。FIG. 2 is an enlarged view of part IV in FIG. 同接合防止剤11が適用される第2実施例の分解斜視図。The exploded perspective view of the 2nd Example to which the bonding inhibitor 11 is applied. 同縦断面図。The same vertical sectional view.

次に、図面に基づいて本発明の実施の形態につき説明する。
図1〜図4は、本発明の接合防止剤11が適用される熱交換器の一例を示す。図1はその分解斜視図、図2は同縦断面図、図3は同接合防止剤11を偏平チューブ1の表面に設けた凸部3(ディンプル)に塗布した状態を示す説明図であり、図4はその縦断面拡大図であって、図2のIV部拡大図である。
Next, an embodiment of the present invention will be described with reference to the drawings.
1 to 4 show an example of a heat exchanger to which the anti-bonding agent 11 of the present invention is applied. FIG. 1 is an exploded perspective view thereof, FIG. 2 is a vertical sectional view thereof, and FIG. 3 is an explanatory view showing a state in which the bonding inhibitor 11 is applied to a convex portion 3 (dimple) provided on the surface of the flat tube 1. FIG. 4 is an enlarged view of the vertical cross section thereof, and is an enlarged view of the IV portion of FIG.

この例では、複数の偏平チューブ1が並列し、その両端部が夫々ヘッダプレート2の図示しないチューブ挿通孔に挿通されてコア4を形成する。そして、各偏平チューブ1の外面は、その両端のみがチューブプレート2にろう付されるが、それ以外の部分はろう付されない。特に、この例では、偏平チューブ1の表面で、偏平チューブ1の外に向けて突設された多数の凸部3は、図2及び図4に示す如く、その凸部3どうしが接触するも、凸部3どうしの接合が防止される。そのために、凸部3の表面には予め接合防止剤11が塗布される。
また、この偏平チューブ1の内部には、図2に示す如く、インナーフィン13が内挿されており、インナーフィン13の頂部及び谷部が偏平チューブ1の内表面に接触した状態で、ろう付される。
In this example, a plurality of flat tubes 1 are arranged in parallel, and both ends thereof are inserted into tube insertion holes (not shown) of the header plate 2 to form a core 4. Then, only both ends of the outer surface of each flat tube 1 are brazed to the tube plate 2, but the other parts are not brazed. In particular, in this example, on the surface of the flat tube 1, a large number of convex portions 3 projecting outward from the flat tube 1 are in contact with each other as shown in FIGS. 2 and 4. , The joint between the convex portions 3 is prevented. Therefore, the bonding inhibitor 11 is applied in advance to the surface of the convex portion 3.
Further, as shown in FIG. 2, an inner fin 13 is inserted inside the flat tube 1, and brazing is performed in a state where the top and valley portions of the inner fin 13 are in contact with the inner surface of the flat tube 1. Will be done.

図2に示す如く、この凸部3はケーシング本体5、端蓋6の表面にも、それらの内に向けて形成されている。一例として、この端蓋6には排気ガス出入口パイプ8が、ケーシング本体5には冷却水出入り口パイプ7が配置される。そして、偏平チューブ1の凸部3と、ケーシング本体5及び端蓋6の各凸部3との間も接合されないように、それらの間も接合防止剤11が塗布される。そして、全体が高温の炉内に挿入されて、コア4とケーシング本体5との間及び、コア4と端蓋6との間、並びに端蓋6と排気ガス出入口パイプ8の付根との間、ケーシング本体5と冷却水出入口パイプ7の付根との間が一体にろう付固定される。 As shown in FIG. 2, the convex portion 3 is also formed on the surfaces of the casing main body 5 and the end lid 6 toward the inside thereof. As an example, an exhaust gas inlet / outlet pipe 8 is arranged on the end lid 6, and a cooling water inlet / outlet pipe 7 is arranged on the casing main body 5. Then, the bonding inhibitor 11 is applied between the convex portion 3 of the flat tube 1 and the convex portions 3 of the casing body 5 and the end lid 6 so as not to be bonded to each other. Then, the whole is inserted into the high temperature furnace, and between the core 4 and the casing main body 5, between the core 4 and the end lid 6, and between the end lid 6 and the base of the exhaust gas inlet / outlet pipe 8. The casing main body 5 and the base of the cooling water inlet / outlet pipe 7 are integrally brazed and fixed.

なお、ろう付に際し、組立てられた各熱交換器用部品は、例えば、重石等の加圧手段によりその積層方向に圧着された状態でろう付接合される。これは、偏平チューブ1とインナーフィン13とのろう付を確実にするために、偏平チューブ1とインナーフィン13との接触を確保する必要があるからであり、凸部3は、その加圧力を伝達するためのものである。 At the time of brazing, each of the assembled heat exchanger parts is brazed and joined in a state of being crimped in the stacking direction by a pressurizing means such as a weight stone. This is because it is necessary to secure contact between the flat tube 1 and the inner fin 13 in order to ensure brazing between the flat tube 1 and the inner fin 13, and the convex portion 3 applies the pressing force thereof. It is for communication.

そのろう付をするために、ヘッダプレート2と偏平チューブ1の端部との間、ヘッダプレート2とケーシング本体5、端蓋6との間に予めろう材が塗布または配置される。
これに対して、図3及び図4における各凸部3の表面間には白色顔料を含有する接合防止剤11が塗布されている。そのため、各凸部3間のみ接合されない。この接合防止剤11としては、白色顔料を含有するインク又は塗料を用いることもできる。なお、白色顔料としては、二酸化チタン又は酸化アルミニウムを含有するものが特に好適である。
In order to perform the brazing, a brazing material is applied or arranged in advance between the header plate 2 and the end portion of the flat tube 1 and between the header plate 2 and the casing main body 5 and the end lid 6.
On the other hand, a bonding inhibitor 11 containing a white pigment is applied between the surfaces of the convex portions 3 in FIGS. 3 and 4. Therefore, only the convex portions 3 are not joined. As the bonding inhibitor 11, an ink or paint containing a white pigment can also be used. As the white pigment, those containing titanium dioxide or aluminum oxide are particularly preferable.

それらの白色顔料は炉内において、高温により塗料等の有機成分が分解または昇華した場合であっても、なお安定に凸部3の表面に残存し、凸部どうしの接合を防止する。よって、加熱や冷却による偏平チューブ1、その他の熱膨張が当該凸部3で拘束されることが無いので、そこに生じる応力集中が防止され、また、振動等の外力が加わった場合においても、当該凸部3に応力集中が生じることが防止される。これにより、破損しにくく耐久性のある熱交換器が形成される。 Even when organic components such as paints are decomposed or sublimated in the furnace due to high temperature, these white pigments still remain stably on the surface of the convex portions 3 and prevent the convex portions from joining each other. Therefore, the flat tube 1 and other thermal expansions due to heating and cooling are not constrained by the convex portion 3, so that stress concentration generated there is prevented, and even when an external force such as vibration is applied. Stress concentration is prevented from occurring in the convex portion 3. This forms a durable heat exchanger that is not easily damaged.

このように形成された熱交換器は、EGRクーラーや排熱回収器として使用することができる。その場合、図1において、一方の冷却水出入口パイプ7から冷却水が偏平チューブ1の外面側を流通して、それが他方の冷却水出入口パイプ7より流出する。そして、高温の排気ガスが一方の排気ガス出入口パイプ8からマニホールド10を介して各偏平チューブ1の内部に導かれ、それが他方のマニホールド9を介して、他方の排気ガス出入口パイプ8から流出する。そして、排気ガスと冷却水との間に熱交換が行われるものである。 The heat exchanger formed in this way can be used as an EGR cooler or an exhaust heat recovery device. In that case, in FIG. 1, cooling water flows from one cooling water inlet / outlet pipe 7 on the outer surface side of the flat tube 1, and it flows out from the other cooling water inlet / outlet pipe 7. Then, the high-temperature exhaust gas is guided from one exhaust gas inlet / outlet pipe 8 to the inside of each flat tube 1 via the manifold 10, and it flows out from the other exhaust gas inlet / outlet pipe 8 via the other manifold 9. .. Then, heat exchange is performed between the exhaust gas and the cooling water.

この時、凸部3間は、図2及び図4に示す如く、接合防止剤11の存在により、接触するも接合されていないので、偏平チューブ1内に高温の排気ガスが流通しても、各凸部3には熱膨張差による応力が集中することはない。
なお、上記実施例では図4に示す如く、互いに接触する凸部3の両凸部に接合防止剤11を塗布したが、その一方を省略することもできる。
At this time, as shown in FIGS. 2 and 4, the convex portions 3 are in contact with each other but not joined due to the presence of the bonding inhibitor 11, so that even if high-temperature exhaust gas flows through the flat tube 1, even if high-temperature exhaust gas flows through the flat tube 1. Stress due to the difference in thermal expansion is not concentrated on each convex portion 3.
In the above embodiment, as shown in FIG. 4, the bonding inhibitor 11 is applied to both convex portions of the convex portions 3 that are in contact with each other, but one of them may be omitted.

次に、図5及び図6は、本発明の第2実施例の熱交換器であって、これが前記第1実施例と異なる点は、コア4を構成する偏平チューブ1の形状である。この例では、偏平チューブ1が上下一対の溝型プレートの嵌着体からなる。さらに、各偏平チューブ1の両端部には厚み方向に膨出した膨出部12が形成され、その膨出部12の位置で各偏平チューブ1どうしが一体にろう付接合される。図6に示す如く、各偏平チューブ1には、インナーフィン13が内挿される。この例においても、偏平チューブ1に設けられた凸部3どうし及び、その凸部3と端蓋6等の凸部3との間も前記同様に接合防止剤11が塗布される。この例も、EGRクーラーや排熱回収器として用いる熱交換器である。 Next, FIGS. 5 and 6 show the heat exchanger of the second embodiment of the present invention, and the difference from the first embodiment is the shape of the flat tube 1 constituting the core 4. In this example, the flat tube 1 is composed of a pair of upper and lower groove-shaped plate fittings. Further, bulging portions 12 bulging in the thickness direction are formed at both ends of each flat tube 1, and the flat tubing 1s are brazed and joined together at the positions of the bulging portions 12. As shown in FIG. 6, an inner fin 13 is inserted into each flat tube 1. Also in this example, the bonding inhibitor 11 is applied to the convex portions 3 provided on the flat tube 1 and between the convex portions 3 and the convex portions 3 such as the end lid 6 in the same manner as described above. This example is also a heat exchanger used as an EGR cooler or an exhaust heat recovery device.

なお、本発明は、ステンレス、アルミニウム合金等の部材に適用可能である。
また、本発明は、ろう付の種類に依らず、銅ろう付、ニッケルろう付、銀ろう付等に広く適用可能である。また、本発明は、ろう付の雰囲気に依らず、真空ろう付、雰囲気ろう付、いずれにも適用可能である。また、本発明は、ろう付の方法に依らず、ペーストろう付、ろう材クラッド材とベア材とのろう付、いずれにも適用可能である。
The present invention can be applied to members such as stainless steel and aluminum alloys.
Further, the present invention can be widely applied to copper brazing, nickel brazing, silver brazing and the like regardless of the type of brazing. Further, the present invention can be applied to both vacuum brazing and atmospheric brazing regardless of the brazing atmosphere. Further, the present invention is applicable to both paste brazing and brazing of a brazing material clad material and a bare material, regardless of the brazing method.

本発明の接合防止剤は、例示したEGRクーラーや排熱回収器に限られるものではなく、各種熱交換器を製造する際の部品間を、部分的に非接合状態を維持するために利用することができる。 The anti-bonding agent of the present invention is not limited to the exemplified EGR cooler and exhaust heat recovery device, and is used to partially maintain a non-bonding state between parts when manufacturing various heat exchangers. be able to.

1 偏平チューブ
2 ヘッダプレート
3 凸部
4 コア
5 ケーシング本体
6 端蓋
7 冷却水出入口パイプ
8 排気ガス出入口パイプ
9 マニホールド
10 マニホールド
11 接合防止剤
12 膨出部
13 インナーフィン
1 Flat tube 2 Header plate 3 Convex part 4 Core 5 Casing body 6 End lid 7 Cooling water inlet / outlet pipe 8 Exhaust gas inlet / outlet pipe 9 Manifold 10 Manifold 11 Anti-joining agent 12 Swelling part 13 Inner fin

Claims (1)

複数の部材間のろう付接合において、各部材の一部の接合を防止するために白色顔料を含有する接合防止剤を用いると共に、各部材間をろう付により接合した熱交換器であって、
熱交換器を構成する隣接部材の各対向位置に凸部が形成され、その凸部に前記接合防止剤が塗布された状態で、各部材間がろう付され、前記接合防止剤が塗布された凸部間が非接合状態にある熱交換器
In brazing joining between a plurality of members, a joining inhibitor containing a white pigment is used to prevent the joining of a part of each member, and a heat exchanger in which each member is joined by brazing.
Convex portions were formed at each facing position of the adjacent members constituting the heat exchanger, and with the convex portions coated with the anti-bonding agent, the members were brazed and the anti-bonding agent was applied. A heat exchanger in which the protrusions are not joined .
JP2017023391A 2017-02-10 2017-02-10 Heat exchanger Active JP6867820B2 (en)

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