JPS6020049A - Heat exchanger - Google Patents

Abstract

PURPOSE:To prevent the heating surface of a heat transfer part from being corroded by acid condensate, by forming a plated layer of high melting point on the surface of it, and by coating, together with a solvent, a layer of compound of organic silicon polymer, with which an ingredient such as flaky aluminum powder is dispersedly mixed, on the plated layer. CONSTITUTION:A plated layer 5, mainly constituted of Ui and Pb of which melting points are above 300 deg.C, is formed on the heating surface 4 of a heat transfer part made of copper material, which is composed of a drum in which a combustion chamber is provided, a heat transfer tube, and heat-absorbing fins. On the layer 5, a coating layer 6 is coated, the layer 6 is constituted of organic silicon polymer, of which principal ingredient is polyborosiloxane which has high resistances to heat and acid in the highly heated atmosphere, in which flaky aluminum powder and mica powder, in order to fill pin holes that may grow in the layer, and powder of ethylene tetrafluoride, in order to give the surface high water repellency by producing a large difference between the surface tension of a layer 6 and that of acid condensate, are dispersed, mixed with the compound of coating layer 6, together with a solvent. By coating these two layers, the surface 4 of a heat transfer part can be prevented from being corroded by heat and acid.

Description

【発明の詳細な説明】 産業上の利用分野 本発明は、瞬間湯ｄｌＸ器、給湯機、暖房機などに使用
される銅製伝熱部材よυ成る熱交換器に関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a heat exchanger made of a copper heat transfer member used in instant hot water DLX equipment, water heaters, space heaters, etc.

従来例の構成とその問題点 従来の瞬間湯沸器に使用でルでいる熱交換器を第１図に
示す。同図に示す通シ熱交換器は燃焼室を内部に設けた
ドラム１と熱交換される水が通過する熱交換チー−プ２
とドラム１のＬ部に設けられた吸熱フィン３の銅を器財
金属とする伝熱部オより構成され、更にこの伝熱部材表
面に鉛を主成分とする溶融金属メッキが施されている。Conventional structure and its problems A heat exchanger that can be used in a conventional instantaneous water heater is shown in FIG. The through heat exchanger shown in the figure includes a drum 1 having a combustion chamber inside and a heat exchanger chute 2 through which water to be heat exchanged passes.
and a heat transfer part O made of copper as the material metal of the heat absorbing fin 3 provided on the L part of the drum 1, and furthermore, the surface of this heat transfer member is plated with molten metal containing lead as a main component. .

この購成ＶＣ寂いて、燃焼排ガス接触側、特にドラム１
と熱交換チー−グ２との接触部、或いは吸熱フィン３と
熱交換チー−ブ２との接触部などの低温部では、燃焼排
ガス中に含まれるＮＯｘ　、Ｓ　Ｏｘ。This purchase VC is lonely, the combustion exhaust gas contact side, especially drum 1
In low-temperature areas such as the contact area between the heat exchanger fins 2 and the heat exchanger fins 2, or the contact area between the endothermic fins 3 and the heat exchanger fins 2, NOx and SOx contained in the combustion exhaust gas are removed.

Ｃｏ　、　Ｃｏ　２　、水蒸気などが凝縮し酸となり、
前記溶融金属メッキや母伺金属である銅を）高酸させる
という問題があった。Co, Co2, water vapor, etc. condense and become acids,
There was a problem in that the molten metal plating and the mother metal (copper) were highly acidic.

このような腐食によって、炭酸鉛、硝酸鉛、塩基１４ミ
炭酸鉛、緑青などの腐食生成物が多量に生じ、これらの
Ｊ／ｇ食生酸生成物熱フィン３に堆積して排ガスの流を
阻害して不完全燃焼を引き起こしたり、熱交換効率を著
しく低「させたりするとともに、剥離して粉状となって
落「し、湯沸器が設置された周囲を汚染させるため衛生
Ｆも好ましいものではなかった。Such corrosion produces a large amount of corrosion products such as lead carbonate, lead nitrate, base 14 lead carbonate, and patina, which are deposited on the J/g saline acid product heat fin 3 and inhibit the flow of exhaust gas. Sanitary F is also preferable because it inhibits heat exchange and causes incomplete combustion and significantly reduces heat exchange efficiency, and it peels off and falls into powder, contaminating the area where the water heater is installed. It wasn't something.

又、腐食の進行によってドラム１や吸熱フィン３に穴が
あくなどの問題も発生し、安全北も好ましくない。Furthermore, problems such as holes being formed in the drum 1 and the heat absorbing fins 3 occur due to the progress of corrosion, which is not desirable for safety.

発明の目的 本発明はかかる従来の欠点を解消するもので燃焼排ガス
が溶解した酸性結露水による熱交換器の腐食を防止する
ことにより熱交換器の耐久性、併収１１生の向上を図る
ことを目的とする。OBJECT OF THE INVENTION The present invention solves the above-described drawbacks of the conventional technology, and aims to improve the durability and durability of the heat exchanger by preventing corrosion of the heat exchanger due to acidic condensation water in which combustion exhaust gas is dissolved. purpose.

発明の構成 この目的を達成するために本発明は、燃焼室を内部に形
成したドラムと熱交換テー−ブと吸熱フィンよジなる銅
製伝熱部材表面に、融点が３００℃以りのメ・ツキ層と
、このメッキ層上にポリボロシロキザン金主成分とする
有機ケイ素重合体とフＶ−り状アルミニウム粉末とマイ
カ粉末と四フッ化エチレン粉末を溶剤とともに分散した
塗料によりコーティング層ケ形成したものである。Structure of the Invention In order to achieve this object, the present invention provides a method for applying metal having a melting point of 300° C. or higher to the surface of a copper heat transfer member consisting of a drum with a combustion chamber formed inside, a heat exchange table, and a heat absorption fin. A coating layer is formed on the coating layer and the plating layer using a paint containing an organosilicon polymer mainly composed of polyborosiloxane gold, a V-shaped aluminum powder, mica powder, and tetrafluoroethylene powder dispersed together with a solvent. This is what I did.

この構成によって、燃焼排ガスが溶解した酸性結露水が
生じても銅製伝熱部付表面に形成したコーチインク層に
より、腐食を防止することができるとともに腐食によっ
て起こる不完全燃焼、熱交換効率の低Ｆ、腐食生成物の
飛散、落Ｆによる汚染を防止することができる。With this configuration, even if acidic condensation water containing dissolved combustion exhaust gas is generated, the coach ink layer formed on the surface of the copper heat transfer part can prevent corrosion, as well as prevent incomplete combustion caused by corrosion and reduce heat exchange efficiency. Contamination due to F, scattering of corrosion products, and falling F can be prevented.

実施例の説明 以１′：、本発明の一実施例について第２図を用いて説
明する。DESCRIPTION OF EMBODIMENTS 1': An embodiment of the present invention will be described with reference to FIG.

同図において、４が燃焼室を内部に形成したドラム、吸
熱フィン、熱交換チー−プよυなる銅製伝熱部材であり
、この表面に融点が３００℃以りのニッケルや鉛を主成
分とする金属などのメ・ツキ層５が形成され、更にこの
に：、に、ポリボロシロキサンを主成分とする有機ケイ
素重合体全バインダーとし、これにフレーク状アルミニ
ウム粉末とマイカ粉末と四フッ化エチレン粉末を添加１
−１溶剤とともに分散混合して錫た塗料を塗布し、加熱
硬化させることによりコーチインク層６が形成されてい
る。In the same figure, 4 is a copper heat transfer member called υ, which includes a drum with a combustion chamber formed inside, heat absorption fins, and a heat exchange cheep. A coating layer 5 of metal or the like is formed, and further, an organosilicon polymer binder mainly composed of polyborosiloxane is used, and flaky aluminum powder, mica powder, and tetrafluoroethylene are added to this. Add powder 1
The coach ink layer 6 is formed by dispersing and mixing a tinned paint with a -1 solvent, applying the tinned paint, and curing it by heating.

この構成において、第１図に示す熱交換器のドラム１内
の燃焼室Ｆ部に配置さ几たガスバーナ（図示せず）が燃
焼した際、ドラム１、吸熱フィン３が熱交換チー−プ２
内を流れる水によって部分的に冷却さ九るためにこルら
の表面が結露し、燃焼排ガス中に含ｔｆＬるＮＯｘ、Ｓ
Ｏｘ；ＣＯ，ＣＯ２＆どが溶解し濃縮さルて腐食性の強
い、例えば、硝酸硫酸などの酸性結露水となるとともに
吸熱フィン３の先端部は２５０℃以辷の高温に達する。In this configuration, when the gas burner (not shown) disposed in the combustion chamber F section in the drum 1 of the heat exchanger shown in FIG.
Because they are partially cooled by water flowing through them, dew condenses on these surfaces, reducing NOx and S contained in the combustion exhaust gas.
Ox; CO, CO2, etc. are dissolved and concentrated to become highly corrosive acidic condensation water, such as nitric acid and sulfuric acid, and the tips of the heat absorbing fins 3 reach a high temperature of 250° C. or higher.

コーチインク層６に使用されるポリボロシロキサン’ｆ
ｒ：Ｕ−＞成分とする有機ケイ素重合体は３００℃以Ｆ
の高ｉｆ’＋ｊｆ　Ｆでも充分耐え得る優ルた耐熱性と
硝酸、硫酸などの酸にも耐え得る優れた耐酸性を有する
のでそれ自身の劣化はなく、更に、コーティング層６内
に存在するピンホールをフレーク状アルミニウム粉末及
びマイカ粉末によって塞ぐことができ、しかも四フッ化
エチレン粉末全添加しているのでコーチインク層６と酸
性結露水との表面張力の差が大きくなり強い撲水性を示
し、ｎＩＪ記酸性結露水のコーチインク層６への侵入が
なくなる。したがって、メッキ層５と銅製伝熱部材４の
腐食を防止することができるとともに腐食生成物の吸熱
フィン３やドラム１０表面への堆積がなくなるのでそれ
が原因で起こる不完全燃焼や汚染を防止でき、熱交換器
としての耐久性、燃焼機器としての信頼性の向上を図る
ことができる。Polyborosiloxane 'f used in coach ink layer 6
r:U->Organosilicon polymer as component is 300℃ or higher
It has excellent heat resistance that can withstand even high if'+jf F and excellent acid resistance that can withstand acids such as nitric acid and sulfuric acid. The holes can be filled with flaky aluminum powder and mica powder, and since the tetrafluoroethylene powder is completely added, the difference in surface tension between the coach ink layer 6 and the acidic condensation water becomes large, and it exhibits strong water-fighting properties. nIJ: Intrusion of acidic condensed water into the coach ink layer 6 is eliminated. Therefore, corrosion of the plating layer 5 and the copper heat transfer member 4 can be prevented, and since corrosion products are not deposited on the surfaces of the heat absorption fins 3 and the drum 10, incomplete combustion and contamination caused by this can be prevented. , durability as a heat exchanger and reliability as a combustion device can be improved.

また、コーチインク層６内には前記フレーク状アルミニ
ウム粉末とマイカ粉末を含有するため熱伝尋性に優へで
おり、しかも従来のような腐食による熱交換効率の低Ｆ
がなぐなるので長期にわた９優几た熱交換効率を維持す
ることができる。In addition, since the coach ink layer 6 contains the flaky aluminum powder and mica powder, it has excellent thermal conductivity, and moreover, it has low heat exchange efficiency due to corrosion as in the conventional case.
The heat exchange efficiency can be maintained over a long period of time.

本実施例で用いるフレーク状アルミニウム粉末は、熱伝
棉性の点からは多い方が良いが多くなると耐食性が悪く
なるため、ｆｆ１ｉＪ記有機ケイ累重合体に対し、１５
〜２５ｗｔ％の範囲が好ましく、マイカ粉末もコーチイ
ンク層６のバリア性、密着性の点カら５〜２’５ｗｔ％
の範囲がよい。また、四フッ化エチレン粉末の添加量は
多すぎると前記有機ケイ素重合体がゲル化するので、５
〜ｊｏｗｔ％の範囲がよい。The flaky aluminum powder used in this example is better from the viewpoint of thermal conductivity, but if the amount is too much, the corrosion resistance deteriorates.
The mica powder is preferably in the range of 5 to 25 wt% from the viewpoint of barrier properties and adhesion of the coach ink layer 6.
A range of is good. In addition, if the amount of tetrafluoroethylene powder added is too large, the organosilicon polymer will gel, so
~jowt% range is preferable.

一方、ポリボロシロキサンを主成分とする有機ケイ素重
合体は、伝熱部材である銅との密着性が著しく悪いこと
、寸た、熱交換器の使用温度が高い所で２５０℃以、１
：になり、この温度では伝熱部材である銅の酸化が著し
く促進され、この酸化被膜が非常に脆いことから、コー
チインク層６の密盾性低Ｆの原因につながるが、銅製伝
熱部側４の表ｍ１に前記有機ケイ素重合体との密着性に
優れ、かつ、耐酸化性の優れたメッキ１〜５を形成する
ことにより、ｒＪｊＪ述の実用上の問題もなくコーチイ
ンク層６の優れた密着性を実現できる。On the other hand, organosilicon polymers whose main component is polyborosiloxane have extremely poor adhesion to copper, which is a heat transfer member.
: At this temperature, the oxidation of copper, which is a heat transfer member, is significantly accelerated, and this oxide film is extremely brittle, which leads to the low F shielding property of the coach ink layer 6. By forming the platings 1 to 5, which have excellent adhesion to the organosilicon polymer and excellent oxidation resistance, on the surface m1 of the side 4, the coach ink layer 6 can be formed without the practical problems described above. Excellent adhesion can be achieved.

本実施例に適用はれるメッキ層５の材料は、熱ダ換器の
使用温度が高い所で２５０℃であることから、融点が３
００℃以りの金属が好ましく、更に銅製伝熱部材４の酸
化防止及びコーチインク層６との強固な密着性を必要と
すること、コスト、作業性の点から、特にニッケルもし
くは鉛を主成分とする金属がよい。The material of the plating layer 5 applied to this example has a melting point of 350°C since the operating temperature of the heat exchanger is 250°C.
A metal having a temperature of 00° C. or higher is preferable, and from the viewpoints of oxidation prevention of the copper heat transfer member 4 and strong adhesion with the coach ink layer 6, cost, and workability, metals containing nickel or lead as the main component are preferable. A metal that has the following properties is preferable.

なお、メッキ層５及びコーチインク層６全形成する際の
メッキ組成、塗料組成、膜厚、党別粘度などは被塗物で
ある熱交換器の形状、メッキ方法、コーティング方法に
よって適宜選定することができ、限定されるものではな
い。In addition, when forming the plating layer 5 and the coach ink layer 6, the plating composition, paint composition, film thickness, party-specific viscosity, etc. should be appropriately selected depending on the shape of the heat exchanger to be coated, the plating method, and the coating method. is possible, but is not limited.

発明の効果 以丘、説明したように本発明は燃焼室を内部に形成した
ドラムと吸熱フィンと熱交換チー−プよりなる銅製伝熱
部材の表面に、耐酸化性、密着性に優ｎたメ・ツキ層と
、耐食性、耐熱性、熱伝尋性に優ルたコーティング層を
形成しているので、（１）銅製伝熱部しの腐食がなくな
り、熱交換器としての耐久性が大幅に向北する。Effects of the Invention As explained, the present invention provides excellent oxidation resistance and adhesion to the surface of a copper heat transfer member consisting of a drum in which a combustion chamber is formed, heat absorption fins, and heat exchange chips. Since the metal layer and the coating layer have excellent corrosion resistance, heat resistance, and thermal conductivity, (1) corrosion of the copper heat transfer parts is eliminated, greatly increasing the durability of the heat exchanger. heading north to

（２）　ドラム、吸熱フィン部への腐食生成物の堆積が
ｌ〈ｌり、不完全燃焼を防止することができるとともに
周囲への汚染がなくなる。(2) Accumulation of corrosion products on the drum and heat-absorbing fins is reduced, thereby preventing incomplete combustion and eliminating contamination of the surrounding area.

（３）畏ＪυＪにわたり、初期の優ルた熱交換効率を維
持することができる。(3) The initial excellent heat exchange efficiency can be maintained over a period of time.

などの効果を有し、実用的価値が極めて高いものである
。It has the following effects and has extremely high practical value.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は従来の瞬間湯沸器の熱交換器を示す外観斜視図
、第２図は本発明の熱交換器の一実施例を示す要部断面
図である。 ４・・・・・・銅製伝熱部側、５・・・・・・メッキ層
、６・・・・・・コーティング層。 代理人の氏名　弁理士　中　尾　敏　男　ほか１名第１
図FIG. 1 is an external perspective view showing a conventional heat exchanger for an instantaneous water heater, and FIG. 2 is a sectional view of essential parts showing an embodiment of the heat exchanger of the present invention. 4...Copper heat transfer part side, 5...Plating layer, 6...Coating layer. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
figure

Claims (2)

【特許請求の範囲】[Claims] （１）燃焼室を内部に設けたドラムと熱交換チ−ブと吸
熱フィンよ！ｌｌなる銅製伝熱部側表面に、融点が３０
０℃以上のメッキ層と、このメッキ層上にポリボロシロ
キサンを主成分とする有機ケイ素重合体と７レーク状ア
ルミニウム粉末とマイカ粉末と四フッ化エチレン粉末を
溶剤とともに分散した塗料によりコーティング層を形成
してなる熱交換器。(1) A drum with a combustion chamber inside, a heat exchange tube, and heat absorption fins! The melting point is 30 on the surface of the copper heat transfer part.
A coating layer is formed on the plating layer at a temperature of 0°C or higher using a paint containing an organosilicon polymer mainly composed of polyborosiloxane, 7-lake-shaped aluminum powder, mica powder, and tetrafluoroethylene powder dispersed together with a solvent. A heat exchanger formed by （２）融点が３００℃以上のメッキ層がニッケル、もし
くは鉛を主成分とする金属からなる特許請求の範囲第１
項記載の熱交換器。(2) Claim 1 in which the plating layer with a melting point of 300°C or higher is made of nickel or a metal whose main component is lead.
Heat exchanger as described in section.