JP2003190880A - Surface treatment method for heat exchanger - Google Patents
Surface treatment method for heat exchangerInfo
- Publication number
- JP2003190880A JP2003190880A JP2001398226A JP2001398226A JP2003190880A JP 2003190880 A JP2003190880 A JP 2003190880A JP 2001398226 A JP2001398226 A JP 2001398226A JP 2001398226 A JP2001398226 A JP 2001398226A JP 2003190880 A JP2003190880 A JP 2003190880A
- Authority
- JP
- Japan
- Prior art keywords
- heat exchanger
- resin
- tube
- treatment
- resin solution
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 36
- 238000004381 surface treatment Methods 0.000 title claims abstract description 25
- 229920005989 resin Polymers 0.000 claims abstract description 74
- 239000011347 resin Substances 0.000 claims abstract description 74
- 239000011248 coating agent Substances 0.000 claims abstract description 32
- 238000000576 coating method Methods 0.000 claims abstract description 32
- 239000007788 liquid Substances 0.000 claims abstract description 13
- 239000003822 epoxy resin Substances 0.000 claims description 4
- 229920000647 polyepoxide Polymers 0.000 claims description 4
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims description 2
- 229910052731 fluorine Inorganic materials 0.000 claims description 2
- 239000011737 fluorine Substances 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 claims description 2
- 229910052782 aluminium Inorganic materials 0.000 abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 10
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract description 9
- 238000010828 elution Methods 0.000 abstract description 3
- 150000001455 metallic ions Chemical class 0.000 abstract 1
- 239000008213 purified water Substances 0.000 abstract 1
- 239000000243 solution Substances 0.000 description 30
- 238000001035 drying Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 229910021645 metal ion Inorganic materials 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 239000002904 solvent Substances 0.000 description 4
- IISBACLAFKSPIT-UHFFFAOYSA-N bisphenol A Chemical compound C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 IISBACLAFKSPIT-UHFFFAOYSA-N 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 description 3
- 239000010935 stainless steel Substances 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- -1 aluminum ions Chemical class 0.000 description 2
- 238000005219 brazing Methods 0.000 description 2
- 239000011247 coating layer Substances 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- QTBSBXVTEAMEQO-UHFFFAOYSA-M Acetate Chemical compound CC([O-])=O QTBSBXVTEAMEQO-UHFFFAOYSA-M 0.000 description 1
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 102100022210 COX assembly mitochondrial protein 2 homolog Human genes 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- 101000900446 Homo sapiens COX assembly mitochondrial protein 2 homolog Proteins 0.000 description 1
- 101100280298 Homo sapiens FAM162A gene Proteins 0.000 description 1
- 102100023788 Protein FAM162A Human genes 0.000 description 1
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 229910001593 boehmite Inorganic materials 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- WMYWOWFOOVUPFY-UHFFFAOYSA-L dihydroxy(dioxo)chromium;phosphoric acid Chemical compound OP(O)(O)=O.O[Cr](O)(=O)=O WMYWOWFOOVUPFY-UHFFFAOYSA-L 0.000 description 1
- AEDZKIACDBYJLQ-UHFFFAOYSA-N ethane-1,2-diol;hydrate Chemical compound O.OCCO AEDZKIACDBYJLQ-UHFFFAOYSA-N 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- FAHBNUUHRFUEAI-UHFFFAOYSA-M hydroxidooxidoaluminium Chemical compound O[Al]=O FAHBNUUHRFUEAI-UHFFFAOYSA-M 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- OXHXATNDTXVKAU-UHFFFAOYSA-N phosphoric acid zinc Chemical compound [Zn].OP(O)(O)=O OXHXATNDTXVKAU-UHFFFAOYSA-N 0.000 description 1
- 229920005597 polymer membrane Polymers 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- IJDNQMDRQITEOD-UHFFFAOYSA-N sec-butylidene Natural products CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Landscapes
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は金属イオンが溶出す
ると支障を生じる液体、例えば純水，エチレングリコー
ル水などを熱交換するための熱交換器において、その液
体側を樹脂コーティングにより表面処理する方法に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger for heat exchange of a liquid which causes troubles when metal ions are eluted, such as pure water and ethylene glycol water, and a method of surface-treating the liquid side with a resin coating. Regarding
【０００２】[0002]
【従来の技術】例えば自動車用の燃料電池は、高分子膜
型のスタックを有し、そのスタック内には反応制御のた
めに純水が循環される。純水はスタック内で温度上昇す
るため、外部の熱交換器で熱交換して冷却される。この
純水はスタック内で直接接触するが、その際、純水に金
属イオンが含まれると、液を通して漏電し、電池の電圧
低下を招くおそれがある。そのため熱交換器は金属イオ
ンが溶出しないものを使用する必要がある。2. Description of the Related Art A fuel cell for an automobile, for example, has a polymer membrane type stack in which pure water is circulated for controlling the reaction. Since the temperature of pure water rises in the stack, it is cooled by exchanging heat with an external heat exchanger. This pure water comes into direct contact with the inside of the stack, but if metal ions are contained in the pure water at that time, there is a possibility that the pure water may leak through the liquid and cause a voltage drop in the battery. Therefore, it is necessary to use a heat exchanger that does not elute metal ions.
【０００３】一般的な熱交換器は多数の金属チューブを
並列に配列し、その両端部を金属製のチューブプレート
に溶接やろう付けなどで接続し、さらに各金属チューブ
の外側にコルゲートフィンなどの放熱部を設けて構成さ
れる。金属チューブをステンレスチューブとした熱交換
器は金属イオンが溶出しないので、純水などの熱交換用
として適している。しかし、ステンレス製の熱交換器は
高価であり、重量が大きく熱伝導率も低いという問題が
ある。In a general heat exchanger, a large number of metal tubes are arranged in parallel, both ends of which are connected to a metal tube plate by welding or brazing, and corrugated fins or the like are provided on the outside of each metal tube. It is configured by providing a heat dissipation portion. A heat exchanger using a metal tube as a stainless steel tube is suitable for heat exchange of pure water or the like because metal ions do not elute. However, there is a problem that the heat exchanger made of stainless steel is expensive, has a large weight, and has a low thermal conductivity.
【０００４】そこでステンレス製の熱交換器に代わるも
のとして、アルミニウム製またはアルミニウム合金製
（以下、本発明ではこれらを単にアルミニウム製とい
う）のチューブを使用した熱交換器を用い、その液体側
（すなわちチューブの内面やタンクに開口する端部）を
表面処理し、金属イオンであるアルミニウムイオンの溶
出を防止する技術が開発されている。なおアルミニウム
製のチューブにおける液体側の表面処理は、エポキシ系
などの熱硬化性樹脂をコーティングする方法が、特開20
01-167782 公報，特許第3172730 号その他として記載さ
れている。Therefore, as an alternative to the heat exchanger made of stainless steel, a heat exchanger using a tube made of aluminum or aluminum alloy (hereinafter, these are simply referred to as aluminum in the present invention) is used and its liquid side (ie, Technology has been developed to prevent the elution of aluminum ions, which are metal ions, by surface-treating the inner surface of the tube and the end portion that opens into the tank). The surface treatment on the liquid side of the aluminum tube is performed by coating a thermosetting resin such as an epoxy-based resin.
It is described as Japanese Patent Publication No. 01-167782, Japanese Patent No. 3172730 and others.
【０００５】[0005]
【発明が解決しようとする課題】しかし、本発明者らが
種々検討した結果、チューブの内面に樹脂溶液を流通さ
せる場合において、コーティングに使用する樹脂溶液の
粘度が高いとチューブ内面にコーティングムラを生じ、
それがピンホール発生の原因になることが分かった。そ
してピンホールが発生するとそこからアルミニウムイオ
ンが溶出して純水に混入するので好ましくない。However, as a result of various investigations by the present inventors, when the resin solution is circulated on the inner surface of the tube, if the viscosity of the resin solution used for coating is high, coating unevenness may occur on the inner surface of the tube. Occurs,
It was found that it causes pinholes. When a pinhole is generated, aluminum ions are eluted from the pinhole and mixed into pure water, which is not preferable.
【０００６】一方、タンクに開口するチューブの端部に
は、通常、鋭角なエッジ部が形成される。そして本発明
者らの検討の結果、このようなエッジ部の回りを樹脂溶
液でコーティングする場合において、コーティングに使
用する樹脂溶液の粘度が低いとエッジ部にピンホールが
発生し易くなることが分かった。On the other hand, a sharp edge portion is usually formed at the end portion of the tube opening to the tank. Then, as a result of the study by the present inventors, in the case of coating the periphery of such an edge portion with a resin solution, it was found that pinholes are easily generated in the edge portion when the viscosity of the resin solution used for coating is low. It was
【０００７】チューブ内面および端部の両方にピンホー
ルを発生させないように樹脂コーティングするには、比
較的粘度の低い樹脂溶液を複数回被着させる方法が考え
られる。しかし該方法では樹脂コーティング層の厚さが
必然的に大きくなり、熱交換効率を低下させるという別
の問題が発生する。そこで本発明は、樹脂コーティング
により熱交換器の内面側の表面処理におけるこのような
問題を解決することを課題とし、そのための新しい表面
処理方法を提供することを目的とする。In order to perform resin coating so that pinholes are not generated on both the inner surface and the end of the tube, a method of applying a resin solution having a relatively low viscosity a plurality of times can be considered. However, this method inevitably increases the thickness of the resin coating layer, which causes another problem that the heat exchange efficiency is reduced. Then, this invention makes it a subject to solve such a problem in the surface treatment of the inner surface side of a heat exchanger by resin coating, and it aims at providing the new surface treatment method for that.
【０００８】[0008]
【課題を解決するための手段】すなわち本発明は、液体
を流通させる多数のチューブの両端部をタンクに接続し
た熱交換器における液体側を表面処理する方法である。
そしてこの方法は、前記チューブの内部を比較的粘度の
低い樹脂溶液でコーティングする第１処理工程と、タン
クに開口するチューブの端部を前記第１処理工程より高
い粘度の樹脂溶液でコーティングする第２処理工程とを
有することを特徴としている（請求項１）。That is, the present invention is a method for surface-treating the liquid side of a heat exchanger in which both ends of a large number of tubes through which liquid is passed are connected to a tank.
Then, this method comprises a first treatment step of coating the inside of the tube with a resin solution having a relatively low viscosity, and a first treatment step of coating the end of the tube opening to the tank with a resin solution having a viscosity higher than that of the first treatment step. It is characterized by having two processing steps (Claim 1).
【０００９】上記表面処理方法において、第１処理工程
における樹脂溶液の粘度を５秒〜１００秒（＃４Ｆ．ａ
ｔ２５°Ｃ）の範囲、第２処理工程における樹脂溶液の
粘度を１０秒〜１０５秒（＃４Ｆ．ａｔ２５°Ｃ）の範
囲とすることが望ましい（請求項２）。即ち、ＪＩＳ−
Ｋ−５６００−２−２に記載されている、フォードカッ
プのＮｏ．４カップ（内径0.162in)で２５°Ｃにおい
て、第１処理工程では100 mlの試料がオリフィスを通っ
て流出する時間が、５〜１００秒であり、第２処理工程
では１０秒〜１０５秒である。In the above surface treatment method, the viscosity of the resin solution in the first treatment step is 5 seconds to 100 seconds (# 4F.a.
t25 ° C) and the viscosity of the resin solution in the second treatment step is preferably 10 seconds to 105 seconds (# 4F.at25 ° C). That is, JIS-
Ford Cup No. 1 described in K-5600-2-2. At 25 ° C with 4 cups (inner diameter 0.162 in), the time taken for 100 ml sample to flow out through the orifice in the first treatment step was 5 to 100 seconds, and in the second treatment step it was 10 to 105 seconds. is there.
【００１０】上記いずれかの表面処理方法において、樹
脂溶液としてエポキシ系樹脂の溶液またはフッ素系樹脂
の溶液を使用することができる（請求項３）。In any of the above surface treatment methods, a solution of epoxy resin or a solution of fluorine resin can be used as the resin solution (claim 3).
【００１１】上記いずれかの表面処理方法において、樹
脂溶液でコーティングする部分には前もって下地処理を
施すことが望ましい（請求項４）。In any one of the above surface treatment methods, it is desirable that the portion to be coated with the resin solution be preliminarily subjected to a surface treatment (claim 4).
【００１２】[0012]
【発明の実施の形態】次に本発明の実施の形態を図面に
より説明する。図１は本発明に係る熱交換器の表面処理
方法の第１工程を説明する図、図２は同じく第２工程を
説明する図である。この例は、タンク本体(3a)がアルミ
ニウム材からなるものであり、タンク本体(3a)も内面被
覆する必要がある場合に適用される。DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a diagram illustrating a first step of a surface treatment method for a heat exchanger according to the present invention, and FIG. 2 is a diagram similarly illustrating a second step. This example is applied when the tank body (3a) is made of an aluminum material and the tank body (3a) also needs to be coated on the inner surface.
【００１３】この例の熱交換器１は、多数のアルミニウ
ム製の並列されたチューブ２と、それらチューブ２の両
端部が液密に貫通するチューブプレート３ｂおよび、そ
のチューブプレート３ｂが被嵌される一端開口の細長い
箱状のタンク本体３ａとを有する。そしてそのチューブ
プレート３ｂとタンク本体３ａとでタンク３が構成され
る。夫々のタンク３には出入口パイプ４，５が連通され
ている。なお、各チューブ２の外面にはアルミニウム製
のコルゲートフィン６または図示しないプレートフィン
がろう付けなどにより固定されている。In the heat exchanger 1 of this example, a large number of parallel tubes 2 made of aluminum, a tube plate 3b through which both ends of the tubes 2 penetrate in a liquid-tight manner, and the tube plate 3b are fitted. It has an elongated box-shaped tank body 3a having an opening at one end. The tube plate 3b and the tank body 3a form the tank 3. Inlet / outlet pipes 4 and 5 are connected to the respective tanks 3. An aluminum corrugated fin 6 or a plate fin (not shown) is fixed to the outer surface of each tube 2 by brazing or the like.
【００１４】次にこれらの図を参照して本発明の表面処
理方法を説明する。
（第１処理工程）先ず、図１により第１処理工程を説明
する。図１のように組み立てた熱交換器１の一方の出入
口パイプ４と他方の出入口パイプ５を、それぞれ容器７
に連通する循環配管１０に接続する。そしてポンプ９を
運転すると、容器７に貯留された樹脂溶液１１は循環配
管１０の一方から液体の出入口パイプ４を経てチューブ
２の内部を通過して他方の出入口パイプ５から流出し、
再び容器７に戻る。Next, the surface treatment method of the present invention will be described with reference to these drawings. (First Processing Step) First, the first processing step will be described with reference to FIG. One inlet / outlet pipe 4 and the other inlet / outlet pipe 5 of the heat exchanger 1 assembled as shown in FIG.
It is connected to the circulation pipe 10 communicating with. Then, when the pump 9 is operated, the resin solution 11 stored in the container 7 passes through the liquid inlet / outlet pipe 4 from one of the circulation pipes 10, passes through the inside of the tube 2 and flows out from the other inlet / outlet pipe 5.
Return to the container 7 again.
【００１５】樹脂溶液１１の循環によりチューブ２の内
面にピンホールを発生しないように均一に且つ、必要最
小限の厚さに樹脂コーティングを形成するには、本発明
者の実験により、樹脂溶液の粘度を５秒〜１００秒（＃
４Ｆ．ａｔ２５°Ｃ）、好ましくは１０秒〜３０秒（＃
４Ｆ．ａｔ２５°Ｃ）程度の比較的低い範囲で流通させ
ればよいことが分かっている。なお、上記の括弧内の
（＃４Ｆ．ａｔ２５°Ｃ）等の意味は既に述べているの
で省略する。In order to form a resin coating uniformly and with a minimum necessary thickness so as to prevent pinholes from being generated on the inner surface of the tube 2 due to the circulation of the resin solution 11, an experiment by the present inventor revealed that Viscosity from 5 seconds to 100 seconds (#
4F. at 25 ° C), preferably 10 to 30 seconds (#
4F. It has been found that it suffices to circulate in a relatively low range of about 25 ° C. The meanings such as (# 4F.at 25 ° C) in the parentheses above have been already described and will be omitted.
【００１６】なお、樹脂溶液の粘度は樹脂の溶剤濃度お
よび樹脂溶液温度を調整することにより容易に設定する
ことができる。溶剤としては、例えばビスフェノールＡ
型のエポキシ樹脂の場合にはシンナー（セロスルブアセ
テートとノルマルブタンの混合液）などが使用される。The viscosity of the resin solution can be easily set by adjusting the solvent concentration of the resin and the temperature of the resin solution. Examples of the solvent include bisphenol A
In the case of the epoxy resin of the type, thinner (a mixed solution of ceroslubu acetate and normal butane) is used.
【００１７】均一な樹脂コーティングが形成されたら、
ポンプ９を停止して樹脂溶液１１の循環を止め、熱交換
器１から循環配管１０を外した後、その内部の残留樹脂
溶液を排出してから乾燥処理を行う。乾燥処理は加熱乾
燥または自然乾燥でもよいが、真空ポンプにより熱交換
器１の乾燥処理部分を真空もしくは減圧状態に維持して
乾燥することが望ましい。このような真空もしくは減圧
乾燥を行うと、ピンホールの発生をより効果的に抑制す
ることができる。なお減圧の範囲は１０-2〜１Ｔｏｒｒ
程度が望ましい。Once a uniform resin coating is formed,
After stopping the pump 9 to stop the circulation of the resin solution 11 and removing the circulation pipe 10 from the heat exchanger 1, the residual resin solution in the inside is discharged and then the drying process is performed. The drying process may be heating drying or natural drying, but it is desirable to maintain the drying process portion of the heat exchanger 1 in a vacuum or reduced pressure state by a vacuum pump to dry. By performing such vacuum or reduced-pressure drying, the generation of pinholes can be suppressed more effectively. The depressurization range is 10 -2 to 1 Torr.
The degree is desirable.
【００１８】（第２処理工程）次に図２により第２処理
工程を説明する。第１処理工程が終了した熱交換器１の
他方のタンク３を樹脂溶液１１の貯留された容器８内に
浸漬する。浸漬により樹脂溶液１１は出入口パイプ５か
らタンク３内に浸入し、それによってチューブ２の端部
のエッジ部周りの樹脂コーティングが行われる。また、
アルミニウム素材である出口パイプ５の内表面も同時に
コーティングされ、ホース部からおこる隙間腐蝕を防ぐ
と共に、イオンの溶出も防止できる。(Second Processing Step) Next, the second processing step will be described with reference to FIG. The other tank 3 of the heat exchanger 1 in which the first treatment step is completed is immersed in the container 8 in which the resin solution 11 is stored. By the immersion, the resin solution 11 enters the tank 3 through the inlet / outlet pipe 5, whereby the resin coating around the edge of the end of the tube 2 is performed. Also,
The inner surface of the outlet pipe 5, which is an aluminum material, is also coated at the same time to prevent crevice corrosion that occurs from the hose portion and also prevent elution of ions.
【００１９】チューブ２の端部のエッジ部周りにピンホ
ールが発生しないように均一に且つ必要最小限の厚さに
樹脂コーティングを形成するには、本発明者の実験によ
れば、樹脂溶液の粘度を第１処理工程より高く、一般的
には１０〜１０５秒（＃４Ｆ．ａｔ２５°Ｃ）好ましく
は２０〜５０秒（＃４Ｆ．ａｔ２５°Ｃ）程度の範囲で
行えばよいことが分かっている。なお、樹脂溶液の粘度
は第１処理工程の場合と同様に、樹脂の溶剤濃度および
樹脂溶液温度を調整することにより容易に設定すること
ができる。In order to form the resin coating uniformly and to a minimum required thickness so that pinholes do not occur around the edge of the end of the tube 2, according to the experiments of the present inventor, It has been found that the viscosity is higher than that in the first treatment step, and generally, it may be performed in the range of 10 to 105 seconds (# 4F.at25 ° C), preferably about 20 to 50 seconds (# 4F.at25 ° C). There is. The viscosity of the resin solution can be easily set by adjusting the solvent concentration of the resin and the temperature of the resin solution, as in the case of the first treatment step.
【００２０】図２のように熱交換器１における他方のタ
ンク３（すなわちチューブ２の他方の端部側）からの樹
脂コーティング処理が終了したら、次に熱交換器１を上
下反転して一方のタンク３からの樹脂コーティング処理
を上記と同様な方法で行う。次いで第１処理工程と同様
に乾燥処理を行うことにより熱交換器１における液体側
の表面処理が完了する。上記各工程によりタンク３内お
よびチューブ端２ａは、第１処理工程および、第２処理
工程により二重の樹脂コーティン層が形成される。When the resin coating process from the other tank 3 of the heat exchanger 1 (that is, the other end side of the tube 2) is completed as shown in FIG. The resin coating process from the tank 3 is performed in the same manner as above. Then, the surface treatment on the liquid side in the heat exchanger 1 is completed by performing the drying treatment as in the first treatment step. A double resin coating layer is formed in the tank 3 and the tube end 2a by the first processing step and the second processing step by the above steps.
【００２１】第１処理工程および第２処理工程に先立っ
て、樹脂コーティングすべき部分には下地処理を施すこ
とが望ましい。このような下地処理を施すと、樹脂コー
ティングとの密着性を向上させると共に、ピンホール発
生をより確実に防止することができる。アルミニウム製
のチューブ２等の下地処理としては、従来この分野で周
知のアルカリ−クロム酸塩法、ベーマイト法、クロム酸
塩法、リン酸−クロム酸塩法、リン酸−亜鉛法、および
ジルコン酸塩，チタン酸塩などのノンクロメート化成処
理法等により行うことができる。Prior to the first treatment step and the second treatment step, it is desirable to subject the portion to be resin-coated to a base treatment. By performing such a base treatment, it is possible to improve the adhesion to the resin coating and prevent pinholes from occurring more reliably. As the surface treatment of the aluminum tube 2 or the like, there are conventionally known alkali-chromate method, boehmite method, chromate method, phosphoric acid-chromate method, phosphoric acid-zinc method, and zirconic acid method well known in the art. It can be performed by a non-chromate chemical conversion treatment method such as salt or titanate.
【００２２】次に、タンク本体３ａが樹脂タンクの場合
には、熱交換器コアのみに、前記第１処理工程と第２処
理工程が順に行なわれる。図３，図４は夫々の処理工程
の説明図である。即ち、この例では、多数の並列された
チューブ２と各チューブ２間に固定された多数のコルゲ
ートフィン６と、チューブ２両端が液密に貫通固定され
た一対のチューブプレート３ｂとで熱交換器コアが構成
される。そこで、図３の如く、夫々のチューブプレート
３ｂにコーティング剤塗布用の一対の仮タンク本体１２
が被嵌され、その仮タンク本体１２を介して、図１に準
じて、粘性の低い樹脂が各チューブ２の内面およびチュ
ーブプレート３ｂの内面にコーティングされる。Next, when the tank body 3a is a resin tank, the first treatment step and the second treatment step are sequentially performed only on the heat exchanger core. 3 and 4 are explanatory views of the respective processing steps. That is, in this example, the heat exchanger includes a plurality of juxtaposed tubes 2 and a plurality of corrugated fins 6 fixed between the tubes 2, and a pair of tube plates 3b in which both ends of the tubes 2 are fixed in a liquid-tight manner. The core is constructed. Therefore, as shown in FIG. 3, a pair of temporary tank main bodies 12 for applying the coating agent to the respective tube plates 3b.
1, the resin having low viscosity is coated on the inner surface of each tube 2 and the inner surface of the tube plate 3b through the temporary tank body 12 according to FIG.
【００２３】次いで、仮タンク本体１２が取り外され
て、図４の如く、粘性の高い樹脂コーティング剤を有す
る容器８内にチューブプレート３ｂの内面およびチュー
ブ端２ａが浸漬されて、コーティング処理される。Next, the temporary tank body 12 is removed, and as shown in FIG. 4, the inner surface of the tube plate 3b and the tube end 2a are immersed in a container 8 having a highly viscous resin coating agent for coating treatment.
【００２４】[0024]
【実施例】図１および図２に示す方法で熱交換器１にお
けるチューブ２の内面とその両端部に樹脂コーティング
を行った。使用した樹脂溶液１１は、ビスフェノールＡ
型のエポキシ樹脂を溶剤であるシンナーに溶解して調整
した。樹脂コーティングの前に樹脂コーティングすべき
部分を十分に水洗処理をし、次いで前記のようなノンク
ロメート化成処理法により下地処理を施した。EXAMPLE A resin coating was applied to the inner surface of the tube 2 and both ends of the tube 2 in the heat exchanger 1 by the method shown in FIGS. The resin solution 11 used is bisphenol A.
The epoxy resin of the mold was prepared by dissolving it in thinner as a solvent. Before the resin coating, the portion to be resin-coated was thoroughly washed with water, and then subjected to the base treatment by the non-chromate chemical conversion treatment method as described above.
【００２５】上記の下地処理後、先ず図１に示す第１処
理工程で主としてチューブ２の内面に樹脂コーティング
処理を行った。その際、樹脂溶液を粘度１５秒（＃４
Ｆ．ａｔ２５°Ｃ）温度２０℃で循環した。樹脂コーテ
ィング処理をした後、熱交換器１の内部を減圧乾燥処理
した。After the above-mentioned base treatment, a resin coating treatment was mainly performed on the inner surface of the tube 2 in the first treatment step shown in FIG. At that time, the viscosity of the resin solution was 15 seconds (# 4
F. It was circulated at a temperature of 20 ° C. After the resin coating treatment, the inside of the heat exchanger 1 was dried under reduced pressure.
【００２６】次に図２に示す第２処理工程でチューブ２
の両端部の樹脂コーティング処理を行った。その際、樹
脂溶液の粘度は粘度２０秒（＃４Ｆ．ａｔ２５°Ｃ）と
し、温度は２０℃とした。第２処理を終了後、前記と同
様に熱交換器１の内部を減圧乾燥処理した。処理後の熱
交換器１のチューブ２の内面および端部周りには５μｍ
の樹脂層が均一に形成されており、且つ、ピンホールは
見当たらなかった。次に、この熱交換器１に濃度０．５
％、温度５０℃の食塩水を１時間循環させたが腐蝕部分
は発生しなかった。Next, the tube 2 is subjected to the second treatment step shown in FIG.
Both ends of the resin were subjected to resin coating treatment. At that time, the viscosity of the resin solution was 20 seconds (# 4F.at 25 ° C), and the temperature was 20 ° C. After the second treatment was completed, the inside of the heat exchanger 1 was dried under reduced pressure in the same manner as described above. 5 μm around the inner surface and the end of the tube 2 of the heat exchanger 1 after the treatment
The resin layer was uniformly formed, and no pinhole was found. Next, in this heat exchanger 1, a concentration of 0.5
%, A saline solution at a temperature of 50 ° C. was circulated for 1 hour, but no corroded portion was generated.
【００２７】一方、比較のために、前記第１処理工程に
おける樹脂濃度を前記第２処理工程の樹脂と同じような
高めに設定してチューブ２の内面の樹脂コーティング処
理をしたところ、樹脂コーティング層にムラが発生し、
それによって複数のピンホールが散見された。また前記
第２処理工程における樹脂濃度を前記第１処理工程の樹
脂と同じように低めに設定してチューブ２の端部周りの
樹脂コーティング処理をしたところ、エッジ部分に複数
のピンホールが散見された。On the other hand, for comparison, when the resin concentration in the first treatment step was set to a high value similar to that of the resin in the second treatment step, the inner surface of the tube 2 was subjected to the resin coating treatment. Unevenness occurs,
As a result, several pinholes were spotted. Further, when the resin concentration around the end of the tube 2 was set to a lower resin concentration in the second treatment step as in the case of the resin in the first treatment step, a plurality of pinholes were found in the edge portion. It was
【００２８】[0028]
【発明の効果】以上のように本発明に係る熱交換器にお
ける液体側の表面処理方法は、チューブの内部を比較的
粘度の低い樹脂溶液でコーティングする第１処理工程
と、タンクに開口するチューブの端部を前記第１処理工
程より高い粘度の樹脂溶液でコーティングする第２処理
工程とを有することを特徴とする。そのためチューブ内
面と端部のエッジ部のいずれにもピンホールを発生させ
ることなく、且つ必要最小限の層厚で樹脂コーティング
処理を行うことができる。As described above, the liquid side surface treatment method in the heat exchanger according to the present invention comprises the first treatment step of coating the inside of the tube with the resin solution having a relatively low viscosity, and the tube opened to the tank. And a second treatment step of coating the end portion of the resin with a resin solution having a viscosity higher than that of the first treatment step. Therefore, the resin coating treatment can be performed with a minimum required layer thickness without generating pinholes on both the inner surface of the tube and the edge portion of the end portion.
【００２９】上記の表面処理方法において、樹脂溶液で
コーティングする部分には前もって下地処理を施すこと
ができる。このような下地処理を行うことにより、ピン
ホールの発生をより確実に防止することができる。In the above surface treatment method, the portion to be coated with the resin solution can be preliminarily subjected to a surface treatment. By performing such a base treatment, it is possible to more reliably prevent the occurrence of pinholes.
【図１】本発明の表面処理方法における第１処理工程を
説明する図。FIG. 1 is a diagram illustrating a first treatment step in a surface treatment method of the present invention.
【図２】本発明の表面処理方法における第２処理工程を
説明する図。FIG. 2 is a diagram illustrating a second treatment step in the surface treatment method of the present invention.
【図３】本発明の他の例の表面処理方法における第１処
理工程を説明する図。FIG. 3 is a diagram illustrating a first treatment step in a surface treatment method of another example of the present invention.
【図４】同表面処理方法における第２処理工程を説明す
る図。FIG. 4 is a diagram illustrating a second treatment step in the surface treatment method.
１ 熱交換器 ２ チューブ ２ａ チューブ端 ３ タンク ３ａ タンク本体 ３ｂ チューブプレート ４ 出入口パイプ ５ 出入口パイプ ６ コルゲートフィン ７ 容器 ８ 容器 ９ ポンプ １０ 循環配管 １１ 樹脂溶液 １２ 仮タンク本体 1 heat exchanger 2 tubes 2a tube end 3 tanks 3a Tank body 3b tube plate 4 gateway pipe 5 gateway pipe 6 corrugated fins 7 containers 8 containers 9 pumps 10 Circulation piping 11 Resin solution 12 Temporary tank body
───────────────────────────────────────────────────── フロントページの続き (72)発明者 新長 秀孝 東京都渋谷区代々木三丁目25番３号 東洋 ラジエーター株式会社内 (72)発明者 田中 外治 東京都渋谷区代々木三丁目25番３号 東洋 ラジエーター株式会社内 (72)発明者 青山 忠道 東京都渋谷区代々木三丁目25番３号 東洋 ラジエーター株式会社内 Ｆターム(参考） 4D075 AB05 AB33 AB41 AB54 BB24Z BB26Z BB67X BB73X CA31 CA43 DA15 DA19 DA23 DA34 DB07 DC13 DC16 DC19 EA07 EB16 EB34 EB56 ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Hidetaka Shinaga 3-25-3 Yoyogi, Shibuya-ku, Tokyo Toyo Inside Radiator Co., Ltd. (72) Inventor Souji Tanaka 3-25-3 Yoyogi, Shibuya-ku, Tokyo Toyo Inside Radiator Co., Ltd. (72) Inventor Tadamichi Aoyama 3-25-3 Yoyogi, Shibuya-ku, Tokyo Toyo Inside Radiator Co., Ltd. F-term (reference) 4D075 AB05 AB33 AB41 AB54 BB24Z BB26Z BB67X BB73X CA31 CA43 DA15 DA19 DA23 DA34 DB07 DC13 DC16 DC19 EA07 EB16 EB34 EB56
Claims (4)
端部をタンク(3) に接続した熱交換器(1) における液体
側を表面処理する方法において、 前記チューブ(2) の内部を比較的粘度の低い樹脂溶液(1
1)でコーティングする第１処理工程と、 タンク(3) に開口するチューブ(2) の端部を前記第１処
理工程より高い粘度の樹脂溶液(11)でコーティングする
第２処理工程と、 を有することを特徴とする熱交換器の表面処理方法。1. A method for surface-treating the liquid side of a heat exchanger (1) in which the ends of a large number of tubes (2) through which liquid flows are connected to a tank (3), wherein the inside of the tube (2) is Resin solution with relatively low viscosity (1
The first treatment step of coating in 1), and the second treatment step of coating the end of the tube (2) opening in the tank (3) with a resin solution (11) having a viscosity higher than that in the first treatment step. A method for surface treatment of a heat exchanger, comprising:
度を５秒〜１００秒（＃４Ｆ．ａｔ２５°Ｃ）の範囲、
第２処理工程における樹脂溶液(11)の粘度を１０秒〜１
０５秒（＃４Ｆ．ａｔ２５°Ｃ）の範囲とすることを特
徴とする請求項１に記載の熱交換器の表面処理方法。2. The viscosity of the resin solution (11) in the first treatment step is in the range of 5 seconds to 100 seconds (# 4F.at 25 ° C.),
The viscosity of the resin solution (11) in the second treatment step is 10 seconds to 1
The surface treatment method for a heat exchanger according to claim 1, wherein the heat treatment is performed for 05 seconds (# 4F.at 25 ° C).
たはフッ素系樹脂の溶液であることを特徴とする請求項
１または請求項２に記載の熱交換器の表面処理方法。3. The surface treatment method for a heat exchanger according to claim 1, wherein the resin solution (11) is a solution of an epoxy resin or a solution of a fluorine resin.
前もって下地処理を施すことを特徴とする請求項１ない
し請求項３のいずれかに記載の熱交換器の表面処理方
法。4. The surface treatment method for a heat exchanger according to claim 1, wherein a portion to be coated with the resin solution (11) is subjected to a surface treatment in advance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001398226A JP4214446B2 (en) | 2001-12-27 | 2001-12-27 | Surface treatment method for heat exchanger |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001398226A JP4214446B2 (en) | 2001-12-27 | 2001-12-27 | Surface treatment method for heat exchanger |
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| Publication Number | Publication Date |
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| JP2003190880A true JP2003190880A (en) | 2003-07-08 |
| JP4214446B2 JP4214446B2 (en) | 2009-01-28 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005267976A (en) * | 2004-03-17 | 2005-09-29 | T Rad Co Ltd | Heat exchanger |
| JP2006322667A (en) * | 2005-05-19 | 2006-11-30 | T Rad Co Ltd | Resin heat exchanger |
-
2001
- 2001-12-27 JP JP2001398226A patent/JP4214446B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005267976A (en) * | 2004-03-17 | 2005-09-29 | T Rad Co Ltd | Heat exchanger |
| JP2006322667A (en) * | 2005-05-19 | 2006-11-30 | T Rad Co Ltd | Resin heat exchanger |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4214446B2 (en) | 2009-01-28 |
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