JP2610183B2 - Electric water heater - Google Patents
Electric water heaterInfo
- Publication number
- JP2610183B2 JP2610183B2 JP63323356A JP32335688A JP2610183B2 JP 2610183 B2 JP2610183 B2 JP 2610183B2 JP 63323356 A JP63323356 A JP 63323356A JP 32335688 A JP32335688 A JP 32335688A JP 2610183 B2 JP2610183 B2 JP 2610183B2
- Authority
- JP
- Japan
- Prior art keywords
- heater
- electric water
- port
- water heater
- rubber packing
- 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 - Lifetime
Links
Landscapes
- Details Of Fluid Heaters (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は電気温水器の電気ヒータ取付部の隙間腐食防
止構造に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a structure for preventing crevice corrosion of an electric heater mounting portion of an electric water heater.
従来のステンレス製電気温水器のヒータ口の構造を第
４図に示す。ヒータ口21と胴板22の溶接部23が、パッキ
ン24の位置と近くにあり、溶接部23の溶接による熱影響
部、酸化スケール発生部にパッキン24が配されているた
め、ヒータ口21とパッキン24による隙間腐食に、溶接部
23の溶接による熱影響及び酸化スケールが重なって、隙
間腐食感受性を高め、ステンレス電気温水器として最も
腐食が激しい箇所となっている。FIG. 4 shows the structure of the heater port of a conventional stainless steel electric water heater. Since the welded portion 23 between the heater port 21 and the body plate 22 is located near the position of the packing 24, the heat-affected zone by welding of the welded portion 23, and the packing 24 are arranged in the oxide scale generating section, Welded area for crevice corrosion due to packing 24
The heat effect and the oxide scale due to the welding of 23 overlap, increasing the susceptibility to crevice corrosion, making it the most severely corroded stainless steel water heater.
また図において25は電気ヒータフランジを示す。 In the drawing, reference numeral 25 denotes an electric heater flange.
なおこの種の構造として関連するものとして、例えば
特開昭54-113554号、実開昭54-127253号、実開昭51-709
49号等が挙げられる。Incidentally, as a structure related to this kind, for example, Japanese Patent Application Laid-Open No. 54-113554, Japanese Utility Model Application Laid-Open No. 54-127253, Japanese Utility Model Application
No. 49 and the like.
上記従来技術は、ステンレス製電気温水器について、
溶接部付近で酸化スケールが発生して腐食に対して条件
の悪い箇所に、パッキン下の隙間構造を配する構造であ
り、溶接性のバラツキにより隙間腐食特性が大きく左右
される結果となる。The prior art described above is for a stainless steel electric water heater,
This is a structure in which an oxide scale is generated in the vicinity of the welded portion and a gap structure under the packing is provided in a place where corrosion conditions are poor, and the gap corrosion characteristics are largely affected by variations in weldability.
本発明は溶接性のバラツキに左右されることない隙間
腐食防止特性を有する電気温水器を提供することを目的
とする。An object of the present invention is to provide an electric water heater having crevice corrosion prevention characteristics that is not affected by variations in weldability.
上記目的を達成するために、本発明の電気温水器は、
ステンレス製の胴板と上下鏡板でタンクを形成し、タン
ク下方にヒータ取付用のヒータ口を設けた電気温水器に
おいて、ヒータ口にゴムパッキンを設け、ゴムパッキン
が接触するヒータ口の接触部又はヒータ口全面を電解研
磨して、該電解研磨した表面に不動態被膜を形成してな
ることを特徴とするものである。In order to achieve the above object, the electric water heater of the present invention comprises:
In an electric water heater in which a tank is formed by a stainless steel body plate and upper and lower end plates, and a heater port for mounting a heater is provided below the tank, rubber packing is provided in the heater port, and a contact portion of the heater port in contact with the rubber packing or The present invention is characterized in that the entire surface of the heater port is electrolytically polished, and a passivation film is formed on the electropolished surface.
またパッキンにはゴムパッキンを使用し、アスベスト
パッキン等にみられる含水性を防止した。Rubber packing was used to prevent the water content of asbestos packing and the like.
パッキンの接触するヒータ口面を溶接加工後に電解研
磨するため、溶接時に発生するステンレス鋼の腐食の起
点となる酸化スケールを完全に除去するとともに、電解
研磨することにより表面を不動態化することができる。
このため溶接部付近にパッキンを配しても、電解研磨を
行うことにより母材と同等以上の腐食特性を有すること
ができる。Electrolytic polishing of the heater contact surface where the packing contacts is performed after welding, so that the oxide scale that is the starting point of stainless steel corrosion generated during welding can be completely removed, and the surface can be passivated by electrolytic polishing. it can.
For this reason, even if packing is arranged near the welded portion, by performing electrolytic polishing, it is possible to have corrosion characteristics equal to or higher than that of the base material.
更に電解研磨を行うことにより、パッキン下のヒータ
口が平滑となり、パッキンとヒータ口の微細な隙間構造
を防止することができ総合的に隙間腐食を防止できる。Further, by performing the electrolytic polishing, the heater port under the packing becomes smooth, and a fine gap structure between the packing and the heater port can be prevented, so that the gap corrosion can be prevented comprehensively.
以下、本発明の一実施例を第１図，第２図，第３図に
より説明する。Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1, 2, and 3. FIG.
図において、１はステンレスタンクを形成する胴板
で、２は上鏡板、３は下鏡板で、胴板１と上鏡板２およ
び下鏡板３は溶接構造としている。In the drawing, 1 is a body plate forming a stainless steel tank, 2 is an upper head plate, 3 is a lower head plate, and the body plate 1, upper head plate 2, and lower head plate 3 have a welded structure.
胴板１下方側面に電気ヒータ４を取付けるヒータ口５
を設け、ゴムパッキン６を介して電気ヒータ４をヒータ
口５に取付けてある。スペーサ７はゴムパッキン６の締
代を限定する電気的な絶縁材で作ったスペーサで、銅ま
たは銅合金製のフランジ８が取付けてある。フランジ８
は電気的な絶縁材製のワッシャー９を介してボルト10で
ヒータ口５に固定してある。ヒータ口５は銅板１との溶
接部11を含めて表面は電解液によって電解研磨し、この
電解研磨した表面に不動態被膜を形成するようにしてい
る。Heater port 5 for attaching electric heater 4 to lower side of body plate 1
And the electric heater 4 is attached to the heater port 5 via the rubber packing 6. The spacer 7 is a spacer made of an electrically insulating material for limiting the interference of the rubber packing 6, and has a flange 8 made of copper or a copper alloy. Flange 8
Are fixed to the heater port 5 with bolts 10 through washers 9 made of an electrically insulating material. The surface of the heater port 5 including the welded portion 11 with the copper plate 1 is electrolytically polished with an electrolytic solution, and a passivation film is formed on the electrolytically polished surface.
上記構成において、ゴムパッキン６、スペーサ７、ワ
ッシャ９は全て電気的な絶縁材料で構成してあるため、
ヒータ口５とフランジ８間には材質の違いによるガルバ
ニック腐食は生じない。In the above configuration, since the rubber packing 6, the spacer 7, and the washer 9 are all made of an electrically insulating material,
Galvanic corrosion does not occur between the heater port 5 and the flange 8 due to the difference in material.
本実施例によれば、ヒータ口５の表面でゴムパッキン
６下に生じる酸化スケール等が除去されたうえに、不動
態化処理されているため、隙間腐食の感受性を低下させ
るとともに、ヒータ口５を平滑にすることができるた
め、ゴムパッキン６との間で微細な隙間を生じないため
隙間腐食の起点を防止することができる。According to the present embodiment, the oxide scale and the like generated under the rubber packing 6 on the surface of the heater port 5 are removed and the passivation treatment is performed. Can be smoothed, so that a fine gap is not generated between the rubber packing 6 and the starting point of crevice corrosion can be prevented.
また、この結果、腐食代を大きく考慮してヒータ口５
の厚みを大きくとることも不要であり、コスト的にも安
価となる。Further, as a result, the heater port 5 is taken into consideration in consideration of the corrosion allowance.
It is not necessary to increase the thickness of the device, and the cost is low.
本発明によれば、ステンレス製のタンクを備えた電気
温水器において、最も腐食の激しいゴムパッキンが接触
するヒータ口の接触部又はヒータ口全面を電解研磨し
て、この電解研磨した表面に不動態被膜を形成すること
により、ゴムパッキンが接触するヒータ口の部分を平滑
化した上で不動態化することができ、これにより、ゴム
パッキンが接触するヒータ口の部分の隙間腐食の感受性
を著しくて低下させることができ、タンクの耐久性を向
上させることができる。また、ヒータ口を製造する際
に、その板厚に大きな腐食代を考慮する必要がないた
め、その製造コストを低廉にすることができる。According to the present invention, in an electric water heater having a stainless steel tank, the contact portion of the heater port where the most corrosive rubber packing comes into contact or the entire surface of the heater port is electrolytically polished, and the electrolytically polished surface is passivated. By forming the coating, the portion of the heater port contacted by the rubber packing can be smoothed and passivated, thereby significantly increasing the susceptibility to crevice corrosion at the portion of the heater port contacted by the rubber packing. Can be reduced, and the durability of the tank can be improved. In addition, when manufacturing the heater port, it is not necessary to consider a large corrosion allowance in the plate thickness, so that the manufacturing cost can be reduced.
第１図は本発明の一実施例を示すタンク断面図、第２
図，第３図は夫々第１図の部分拡大詳細図である。第４
図は従来例を示す説明図である。 １……胴板、２……上鏡板、３……下鏡板、４……電気
ヒータ、５……ヒータ口、６……ゴムパッキン、８……
ヒータフランジ、11……溶接部。FIG. 1 is a sectional view of a tank showing one embodiment of the present invention, and FIG.
FIG. 3 is a partially enlarged detailed view of FIG. 4th
The figure is an explanatory view showing a conventional example. DESCRIPTION OF SYMBOLS 1 ... Body plate, 2 ... Upper head plate, 3 ... Lower head plate, 4 ... Electric heater, 5 ... Heater opening, 6 ... Rubber packing, 8 ...
Heater flange, 11 ... weld.
Claims (1)
形成し、タンク下方にヒータ取付用のヒータ口を設けた
電気温水器において、ヒータ口にゴムパッキンを設け、
ゴムパッキンが接触するヒータ口の接触部又はヒータ口
全面を電解研磨して、該電解研磨した表面に不動態被膜
を形成してなることを特徴とする電気温水器。1. An electric water heater in which a tank is formed by a stainless steel body plate and upper and lower end plates, and a heater port for mounting a heater is provided below the tank, a rubber packing is provided at the heater port.
An electric water heater characterized in that a contact portion of a heater port with which a rubber packing comes into contact or an entire surface of the heater port is electrolytically polished, and a passive film is formed on the electropolished surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63323356A JP2610183B2 (en) | 1988-12-23 | 1988-12-23 | Electric water heater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63323356A JP2610183B2 (en) | 1988-12-23 | 1988-12-23 | Electric water heater |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02169963A JPH02169963A (en) | 1990-06-29 |
| JP2610183B2 true JP2610183B2 (en) | 1997-05-14 |
Family
ID=18153867
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63323356A Expired - Lifetime JP2610183B2 (en) | 1988-12-23 | 1988-12-23 | Electric water heater |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2610183B2 (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5170949U (en) * | 1974-11-30 | 1976-06-04 | ||
| JPS5942751B2 (en) * | 1980-03-29 | 1984-10-17 | 住友金属工業株式会社 | Method for preventing local corrosion of stainless steel structures |
-
1988
- 1988-12-23 JP JP63323356A patent/JP2610183B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02169963A (en) | 1990-06-29 |
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