JP2821272B2 - Treatment method for the inner surface of the heat collection tank - Google Patents
Treatment method for the inner surface of the heat collection tankInfo
- Publication number
- JP2821272B2 JP2821272B2 JP2413118A JP41311890A JP2821272B2 JP 2821272 B2 JP2821272 B2 JP 2821272B2 JP 2413118 A JP2413118 A JP 2413118A JP 41311890 A JP41311890 A JP 41311890A JP 2821272 B2 JP2821272 B2 JP 2821272B2
- Authority
- JP
- Japan
- Prior art keywords
- collecting tank
- heat collecting
- tin
- eutectic alloy
- heat
- 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.)
- Expired - Fee Related
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/40—Solar thermal energy, e.g. solar towers
- Y02E10/44—Heat exchange systems
Description
【０００１】[0001]
【産業上の利用分野】本発明は、内部が真空に保持され
た透明な長尺のガラス管を有する真空式太陽熱集熱器の
貯水容器として用いられる集熱タンクの内表面を処理す
る方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for treating the inner surface of a heat collecting tank used as a water storage container of a vacuum solar heat collector having a transparent long glass tube whose inside is kept in a vacuum. Things.
【０００２】[0002]
【従来の技術】太陽光線の持つ熱エネルギーを熱源とし
て利用する真空式太陽熱集熱器は、近年まで種々の形態
のものが提案され、その一つとして本出願人も内部が真
空に保持された透明な長尺のガラス管と、該ガラス管内
に同軸状に配置され、貯水容器として用いられる大容量
の集熱タンクを有する真空式太陽熱集熱器を先に出願し
ている。（特願昭６２−１６４２４号）2. Description of the Related Art Various types of vacuum solar heat collectors utilizing the heat energy of sunlight as a heat source have been proposed in various forms until recently. The applicant has previously filed an application for a vacuum solar heat collector having a transparent long glass tube and a large-capacity heat collection tank disposed coaxially in the glass tube and used as a water storage container. (Japanese Patent Application No. 62-16424)
【０００３】この真空式太陽熱集熱器の集熱タンクは、
その外表面に選択吸収膜が被着され、その内部に一定時
間水を汲み置きすることによって温めるが、弱酸性の水
質で使われた場合、集熱タンクの素材金属がイオンとし
て微量、水中に溶出し、この金属イオンが例えば石けん
と反応して金属石けんとなり、特に集熱タンクの素材金
属として銅を使用した場合に発生する銅石けんは、青緑
色を呈するためタオルが青く染まる、いわゆる青水問題
の要因となる。[0003] The heat collecting tank of this vacuum solar heat collector is
The outer surface is coated with a selective absorption film, which is warmed by pumping water inside for a certain period of time. This metal ion elutes and reacts with soap, for example, to form metal soap. Especially, copper soap generated when copper is used as the material metal of the heat collection tank is blue-green, and the towel is dyed blue, so-called blue water problem. Is a factor.
【０００４】この対策として、本出願人は先に集熱タン
クの内表面にスズメッキ膜を、無電解メッキ、電気メッ
キ、溶融メッキ等の方法で形成することによって金属イ
オンの溶出を抑えた真空式太陽熱集熱器を出願している
（実願昭６３−７８６７６号）。[0004] As a countermeasure, the present applicant previously formed a tin plating film on the inner surface of a heat collecting tank by a method such as electroless plating, electroplating, and hot-dip plating to suppress the elution of metal ions. We have applied for a solar collector (Japanese Utility Model Application No. 63-78676).
【０００５】[0005]
【発明が解決しようとする課題】ところで真空式太陽熱
集熱器の集熱タンクは、ガラス管内に配置された後、排
気工程で４００℃以上に加熱（ベーキング）される。こ
のベーキング温度は、スズの融点以上であり、そのため
内表面にスズメッキ膜を形成した集熱タンクの場合、ス
ズメッキ膜がベーキング時に再溶融し、これによって集
熱タンク内表面にＳｎの含有量の多い低融点の共晶合金
が形成され、この共晶合金が溶融して、徐々に集熱タン
クの素材金属に侵入し、最終的には、集熱タンクを貫通
して孔をあけるという問題が発生する。By the way, the heat collecting tank of the vacuum solar heat collector is placed in a glass tube and then heated (baked) to 400 ° C. or more in an exhausting process. This baking temperature is equal to or higher than the melting point of tin. Therefore, in the case of a heat collecting tank in which a tin plating film is formed on the inner surface, the tin plating film is re-melted during baking, whereby the Sn content on the inner surface of the heat collecting tank is large. A eutectic alloy with a low melting point is formed, and this eutectic alloy melts and gradually penetrates into the material metal of the heat collection tank, eventually causing a problem of drilling holes through the heat collection tank. I do.
【０００６】本発明の目的は、予め集熱タンク内表面に
形成されたスズメッキ膜が、真空式太陽熱集熱器の排気
工程のベーキングによって再溶融しても、集熱タンクを
貫通して孔をあけることを防止する集熱タンク内表面の
処理方法を提供することである。An object of the present invention is to form a hole through a heat collecting tank even if a tin plating film previously formed on the inner surface of the heat collecting tank is re-melted by baking in a vacuum solar heat collector exhaust process. It is an object of the present invention to provide a method for treating the inner surface of a heat collecting tank, which prevents opening.
【０００７】[0007]
【課題を解決するための手段】本発明の集熱タンク内表
面の処理方法は、内部が真空に保持された透明な長尺の
ガラス管を有する真空式太陽熱集熱器の貯水容器として
用いられ、その一端に開口部を有する集熱タンクを、予
め２４０〜３００℃に加熱した後、該開口部から塩化ア
ンモニウムを主成分とするフラックスを注入し、さらに
２４０〜３００℃に加熱した溶融スズを注入することに
よって、その内表面の全体に亙って、金属スズ層と共晶
合金層からなるスズメッキ膜を形成することを特徴とす
る。The method for treating the inner surface of a heat collecting tank according to the present invention is used as a water storage container of a vacuum solar heat collector having a transparent long glass tube whose inside is kept in a vacuum. After heating a heat collecting tank having an opening at one end to 240 to 300 ° C. in advance, a flux containing ammonium chloride as a main component is injected from the opening, and molten tin heated to 240 to 300 ° C. By injection, a tin plating film composed of a metal tin layer and a eutectic alloy layer is formed over the entire inner surface.
【０００８】本発明によれば、スズメッキ膜の内層とし
て、Ｓｎの含有量の少ない共晶合金層が形成され、この
共晶合金の融点は、排気工程のベーキング温度よりも高
く、ベーキング時にスズメッキ膜の最表層の金属スズが
再溶融しても共晶合金層は溶融しないため、この共晶合
金層がバリアーの役目を果たし、再溶融した金属スズが
集熱タンクの素材金属へ侵入するのを防ぐ。According to the present invention, a eutectic alloy layer having a small content of Sn is formed as an inner layer of the tin plating film, and the melting point of the eutectic alloy is higher than the baking temperature in the evacuation step. Since the eutectic alloy layer does not melt even when the tin metal on the outermost layer re-melts, this eutectic alloy layer serves as a barrier, preventing the re-melted tin from entering the base metal in the heat collection tank. prevent.
【０００９】本発明で塩化アンモニウムを主成分とする
フラックスを集熱タンク内部に注入するのは、集熱タン
ク内表面の酸化を防止し、溶融スズと集熱タンクの素材
金属を良好に反応させて所望の共晶合金を均一に形成さ
せるためである。In the present invention, the flux containing ammonium chloride as a main component is injected into the heat collecting tank to prevent oxidation of the inner surface of the heat collecting tank and to cause the molten tin to react well with the material metal of the heat collecting tank. This is to form a desired eutectic alloy uniformly.
【００１０】本発明における集熱タンクの加熱温度なら
びに溶融スズの温度は、各々２４０〜３００℃が好まし
い、すなわち２４０℃未満では、共晶合金がＳｎの含有
量の多い低融点の組成となり、一方３００℃を超える
と、スズメッキ膜と集熱タンクの素材金属との反応が激
しくなり、共晶合金層の厚みが大きく、集熱タンクの素
材金属の厚みが小さくなるため、強度上好ましくないか
らである。In the present invention, the heating temperature of the heat collecting tank and the temperature of the molten tin are preferably 240 to 300 ° C., respectively, that is, if the temperature is lower than 240 ° C., the eutectic alloy has a low melting point composition containing a large amount of Sn. If the temperature exceeds 300 ° C., the reaction between the tin plating film and the material metal of the heat collection tank becomes intense, the thickness of the eutectic alloy layer becomes large, and the thickness of the material metal of the heat collection tank becomes small. is there.
【００１１】[0011]
【作用】従来の無電解メッキや電気メッキによって、集
熱タンクの内表面にスズメッキ膜を形成しても、単に集
熱タンクの素材金属の表面に金属スズが付着した構造と
なるだけであり、また溶融メッキの場合、融点以上の温
度に加熱したスズを常温の集熱タンクに注入するため、
スズメッキ膜の集熱タンク側に共晶合金が部分的に形成
されるが、この共晶合金は、Ｓｎの含有量の多い低融点
の組成となってしまう。それに対し、本発明の集熱タン
ク内表面の処理方法によると、スズメッキ膜の内層とし
て、ベーキング温度より高い融点をもつＳｎの含有量の
少ない共晶合金層が形成されるため、排気工程のベーキ
ング時に、この層がバリアーとなり、スズメッキ膜の最
外層の金属スズが再溶融しても、集熱タンクの素材金属
へ侵入するのを防ぎ、集熱タンクに孔があくことがな
い。[Effect] Even if a tin plating film is formed on the inner surface of the heat collecting tank by conventional electroless plating or electroplating, the structure simply has metal tin adhered to the surface of the material metal of the heat collecting tank. In the case of hot-dip plating, tin heated to a temperature equal to or higher than the melting point is injected into a normal-temperature heat collecting tank,
An eutectic alloy is partially formed on the heat collecting tank side of the tin plating film, but this eutectic alloy has a low melting point composition with a high Sn content. On the other hand, according to the method for treating the inner surface of the heat collecting tank of the present invention, a eutectic alloy layer having a melting point higher than the baking temperature and having a low Sn content is formed as the inner layer of the tin plating film. Sometimes, this layer acts as a barrier, preventing the metal tin of the outermost layer of the tin plating film from re-melting and preventing intrusion into the material metal of the heat collecting tank, so that there is no hole in the heat collecting tank.
【００１２】[0012]
【実施例】以下、本発明の集熱タンク内表面の処理方法
を実施例に基づいて説明する。まず外径１１０ｍｍ、全
長２２００ｍｍ、肉厚０．４ｍｍの大きさで、一端に開
口部を有し、他端が閉塞された銅製の集熱タンクを、開
口部を上方にして対地角度１０°に設置した状態で回転
しながら、ヒーターによって２６０℃に加熱した。その
後、塩化アンモニウム５％、塩化第一スズ３％のフラッ
クスを霧状にして、該集熱タンクの開口部から１５ｃｃ
注入し、１５秒後、予め２６０℃に加熱した溶融スズを
該集熱タンクの開口部から４００ｇ注入し、該集熱タン
クの底の閉端部へ達した後、余分の溶融スズを開口部を
下向けにして除去した。DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a method for treating the inner surface of a heat collecting tank according to the present invention will be described based on embodiments. First, a copper heat collecting tank having an outer diameter of 110 mm, a total length of 2200 mm, and a wall thickness of 0.4 mm, having an opening at one end and a closed end at an angle of 10 ° to the ground with the opening upward. While rotating in the installed state, it was heated to 260 ° C. by a heater. Thereafter, a flux of 5% ammonium chloride and 3% stannous chloride was atomized, and 15 cc from the opening of the heat collecting tank.
After 15 seconds, 400 g of molten tin previously heated to 260 ° C. was injected from the opening of the heat collecting tank, and after reaching the closed end of the bottom of the heat collecting tank, excess molten tin was injected into the opening. Was removed face down.
【００１３】こうして作製した集熱タンクの断面図を図
１に示す。図中、１０はスズメッキ膜、１１は金属スズ
層、１２はＳｎを３０％以上含むＣｕ−Ｓｎ共晶合金
層、１３は集熱タンクの素材金属であり、Ｃｕ−Ｓｎ共
晶合金層１２の融点は、５００℃以上である。FIG. 1 shows a sectional view of the heat collecting tank thus produced. In the figure, 10 is a tin plating film, 11 is a metal tin layer, 12 is a Cu-Sn eutectic alloy layer containing 30% or more of Sn, 13 is a material metal of a heat collecting tank, and The melting point is 500 ° C. or higher.
【００１４】この集熱タンクをガラス管内に配置し、排
気工程において４００℃でベーキングすると、金属スズ
層１１は再溶融したが、Ｃｕ−Ｓｎ共晶合金層１２は溶
融せず、集熱タンクに孔があくことはなかった。When this heat collecting tank was placed in a glass tube and baked at 400 ° C. in the evacuation step, the metal tin layer 11 was re-melted, but the Cu—Sn eutectic alloy layer 12 was not melted. There were no holes.
【００１５】[0015]
【発明の効果】以上のように本発明の方法を施した集熱
タンクは、排気工程のベーキング時に、その内表面の金
属スズ層が再溶融しても、集熱タンクの素材金属へ侵入
することがないため、集熱タンクに孔があくことがな
い。As described above, the heat collecting tank to which the method of the present invention has been applied penetrates into the base metal of the heat collecting tank even if the metal tin layer on the inner surface is re-melted during the baking in the evacuation step. There is no hole in the heat collecting tank.
【図面の簡単な説明】[Brief description of the drawings]
【図１】本発明の方法を施した集熱タンクの断面図であ
る。FIG. 1 is a sectional view of a heat collecting tank to which a method of the present invention has been applied.
１０ スズメッキ膜 １１ 金属スズ層 １２ Ｃｕ−Ｓｎ共晶合金層 １３ 集熱タンクの素材金属 DESCRIPTION OF SYMBOLS 10 Tin plating film 11 Metal tin layer 12 Cu-Sn eutectic alloy layer 13 Material metal of heat collecting tank
Claims (1)
ラス管を有する真空式太陽熱集熱器の貯水容器として用
いられ、その一端に開口部を有する集熱タンクを、予め
２４０〜３００℃に加熱した後、該開口部から塩化アン
モニウムを主成分とするフラックスを注入し、さらに２
４０〜３００℃に加熱した溶融スズを注入することによ
って、その内表面の全体に亙って、金属スズ層と共晶合
金層からなるスズメッキ膜を形成することを特徴とする
集熱タンク内表面の処理方法。1. A heat collecting tank, which is used as a water storage container of a vacuum solar heat collector having a transparent long glass tube whose inside is kept in a vacuum and has an opening at one end, is preliminarily provided with 240 to 300. After heating to ℃, a flux containing ammonium chloride as a main component was injected from the opening, and furthermore,
Injection of molten tin heated to 40 to 300 ° C. to form a tin plating film composed of a metal tin layer and a eutectic alloy layer over the entire inner surface thereof. Processing method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2413118A JP2821272B2 (en) | 1990-12-21 | 1990-12-21 | Treatment method for the inner surface of the heat collection tank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2413118A JP2821272B2 (en) | 1990-12-21 | 1990-12-21 | Treatment method for the inner surface of the heat collection tank |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04222348A JPH04222348A (en) | 1992-08-12 |
| JP2821272B2 true JP2821272B2 (en) | 1998-11-05 |
Family
ID=18521816
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2413118A Expired - Fee Related JP2821272B2 (en) | 1990-12-21 | 1990-12-21 | Treatment method for the inner surface of the heat collection tank |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2821272B2 (en) |
-
1990
- 1990-12-21 JP JP2413118A patent/JP2821272B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04222348A (en) | 1992-08-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |