JPS60134197A - Heat exchanger - Google Patents
Heat exchangerInfo
- Publication number
- JPS60134197A JPS60134197A JP24097883A JP24097883A JPS60134197A JP S60134197 A JPS60134197 A JP S60134197A JP 24097883 A JP24097883 A JP 24097883A JP 24097883 A JP24097883 A JP 24097883A JP S60134197 A JPS60134197 A JP S60134197A
- Authority
- JP
- Japan
- Prior art keywords
- tube
- cooling
- corrosion
- tube sheet
- heat exchanger
- 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.)
- Pending
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
- F28F9/02—Header boxes; End plates
- F28F9/04—Arrangements for sealing elements into header boxes or end plates
- F28F9/16—Arrangements for sealing elements into header boxes or end plates by permanent joints, e.g. by rolling
- F28F9/162—Arrangements for sealing elements into header boxes or end plates by permanent joints, e.g. by rolling by using bonding or sealing substances, e.g. adhesives
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
- F28F19/02—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using coatings, e.g. vitreous or enamel coatings
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Details Of Heat-Exchange And Heat-Transfer (AREA)
Abstract
Description
【発明の詳細な説明】 〔発明の技術分野〕 本発明は多管式の熱交換器に関する。[Detailed description of the invention] [Technical field of invention] The present invention relates to a shell-and-tube heat exchanger.
一般に淡水用の多管式熱交換器は、第１因に示されるよ
うに管板１に銅合金を、また冷却＝、 ２ Ｋ銅を用い
、冷却管２は拡管によシ管板１ｖＣｃｌＰｊ層して取付
けられる。この場合は特に問題ないが、コストダウンを
図るために管板１に鉄を用いた場合、冷却管２と管板１
は銅と鉄、すなわち異種の金属が接触した状態となる。In general, a shell-and-tube heat exchanger for freshwater uses a copper alloy for the tube sheet 1 and 2K copper for cooling, as shown in the first factor, and the cooling tube 2 is expanded to form a tube sheet with a layer of 1vCclPj. installed. There is no particular problem in this case, but if iron is used for the tube sheet 1 in order to reduce costs, the cooling tube 2 and the tube sheet 1
copper and iron, that is, different metals are in contact with each other.
淡水中において異＋１道金属が接触している場合、腐食
電位の低い方の金属はアノードとなって、それが単独で
おかれた場合以上に激しく腐食される。たとえば銅と鉄
とを＆：触させて淡水中に浸漬すると、鉄がアノードと
して作用して腐食され、銅がカソードとして作用して保
護される。この腐食は異種金属接触腐食と呼はれ、保護
側の金属との接触部分が溝状に腐食されるのが特徴であ
る。したがって熱交換器の場合でもこのような腐食電位
差による電池作用腐食を生じ、通水側の冷却１′周凹の
管板１が溝状ＩＣ腐食されて溝状腐食部３を形成する。When two different metals are in contact in fresh water, the metal with the lower corrosion potential becomes the anode and corrodes more violently than if it were left alone. For example, when copper and iron are brought into contact and immersed in fresh water, the iron acts as an anode and corrodes, while the copper acts as a cathode and is protected. This corrosion is called dissimilar metal contact corrosion, and is characterized by groove-shaped corrosion at the contact area with the protected metal. Therefore, even in the case of a heat exchanger, battery action corrosion occurs due to such a corrosion potential difference, and the concave tube plate 1 around the cooling 1' on the water flow side is corroded in a groove-like IC manner to form a groove-like corroded portion 3.
父、管板の腐食により生じた腐食生成物４が冷却管２０
入口をふさいだり、水流入により管内に侵入し滞留して
水の流れを妨げる那の欠点があった。Father, corrosion products 4 caused by corrosion of the tube sheet are present in the cooling pipe 20.
They have the disadvantage of blocking the inlet or entering the pipe due to water inflow and staying there, impeding the flow of water.
本発明は上記の点ＶＣ鑑みなされたもので、管板と冷却
管との接合部に腐食を生じない熱交換器を提供すること
を目的とする。The present invention was made in view of the above point VC, and an object of the present invention is to provide a heat exchanger that does not cause corrosion at the joint between the tube sheet and the cooling pipe.
上記目的を達成するために本発明は、管板の冷却水側の
冷却管取付孔周囲ＶＣＵｋＪ取シした酵と設け、て冷却
管端部を管板の表面より突き出すとともに冷却管周囲の
管板の電池作用腐食範囲を塗装して電池作用腐食を防止
する。In order to achieve the above object, the present invention provides a VCUkJ hole around the cooling pipe mounting hole on the cooling water side of the tube sheet, so that the end of the cooling tube protrudes from the surface of the tube sheet, and the tube plate around the cooling tube is Prevent battery corrosion by painting areas affected by battery corrosion.
以下本発明の一実施例につき第２図を参照して説明する
。第２図は本発明の一実施例の熱交換器における冷却管
取付部の〜１１Ｊ１面図でおる。管板ｌの冷却水側の冷
却管２取付孔を１０以上の面取ｐＭを施して冷却管２を
拡管固定した後冷却管２周囲の゛戚池作用腐食範囲をク
ールエポキシ塗料５で塗装することによ！Ｄ＃成される
。管板１からの冷却管２先端の突出し長さｆ、ｌ！とす
る。An embodiment of the present invention will be described below with reference to FIG. FIG. 2 is a plan view of the cooling pipe attachment portion of the heat exchanger according to the embodiment of the present invention. After the cooling pipe 2 mounting hole on the cooling water side of the tube plate l is chamfered to a pM of 10 or more and the cooling pipe 2 is expanded and fixed, the corroded area around the cooling pipe 2 is painted with cool epoxy paint 5. Especially! D# is done. Projection length f, l of the tip of the cooling tube 2 from the tube plate 1! shall be.
第３図はモデル冷却器Ｙ（よる１年間の腐食試験結果で
管板の接水部面積に対する冷却管周囲塗装部分の割合と
電池作用腐食深さとの関係を無塗装管板との比較で示し
ておる。無塗装及び０．３以上の割合の塗装面績の場合
には０脚管周囲２鴎以内に電池作用腐食が発生したが０
．３以下の割合の塗装面績の＠＠’には奄池作用腐寛は
発生していない。Figure 3 shows the relationship between the ratio of the painted area around the cooling tube to the area of the tube sheet in contact with water and the battery action corrosion depth, based on the results of a one-year corrosion test using model cooler Y (comparison with an unpainted tube sheet). In the case of unpainted surfaces and painted surfaces with a ratio of 0.3 or more, battery corrosion occurred within 2 holes around the 0 leg pipe, but 0.
．． At @@' with a painted surface ratio of 3 or less, no Achieve effect rot occurred.
この結果から本祐明における冷却管周囲の車装範囲は冷
却管外面より２朋以上から内側とし、管板の接水部面積
の０．３以下の割合の範囲が適当であるといえる。From this result, it can be said that the vehicle mounting area around the cooling pipe in Moto Yumei should be from 2 or more to the inner side from the outer surface of the cooling pipe, and a range that is a ratio of 0.3 or less of the water contact area of the tube plate is appropriate.
本発明の防食方法か前６ピ電池作用贋食ＫＷ効である理
由は冷却管周囲のタールエポキシ遊装部分に対して無ｍ
装部分か占める面積が大きくこの部分が犠牲１１１１＋
１！、となり縞食さｎるためタールエボキ７値装部分Ｖ
Ｃピ／ホール等の欠陥がめったとじても欠陥部分での腐
食の発生、進行が阻止されるためでわると考えられる。The reason why the corrosion prevention method of the present invention is effective against corrosion by the front 6-pin battery is that it does not damage the tar-epoxy loose parts around the cooling pipe.
The area occupied by the mounting part is large, and this part is the sacrifice 1111+
1! , Tar Eboki 7-value clothing part V because of striped food
Even if defects such as C pins/holes occur rarely, it is thought that corrosion occurs and progresses at the defective portions.
全面塗装した場合には犠注１ｔｊｌ）極として腐食する
部分がどこにもないため塗膜に欠陥があった場合にはそ
の部分で腐食が発生し塗膜下を侵食していくため塗膜が
剥離しやすくなる。又、冷却管取付孔の面取りをｉｏ％
ｆ取ることにより冷却管外面及び冷却管周囲４内の途膜
の接着面積が大きくな９塗膜が剥離しにくくなる。If the entire surface is painted, there is no part that will corrode as a sacrificial note, so if there is a defect in the paint film, corrosion will occur in that part and erode the area under the paint film, causing the paint film to peel off. It becomes easier to do. In addition, the chamfer of the cooling pipe installation hole is io%
By increasing f, the coating film 9, which has a large adhesion area on the outer surface of the cooling pipe and in the area around the cooling pipe 4, becomes difficult to peel off.
なお本発明の実施例ではクールエポキシ塗料による塗装
例を示したがエポキシ塗料、７３４リウレタノ塗料、シ
リコーン塗料等耐水性が良く１気的に絶縁性の艮い蓋科
であれは同僚の効果か得られる。In the examples of the present invention, we have shown examples of painting with cool epoxy paints, but epoxy paints, 734 uretano paints, silicone paints, etc., which have good water resistance and are instantly insulating, can also be used with the help of my colleagues. It will be done.
次に冷却管２の管板１０表面からの突き出し長さｌにつ
いて説明する。冷却管２の突き出し長さは前ｄピ・電池
作用による腐食を防止する上からは自由でろる。しかし
ながら冷型管の先端が第１図のように管板ｌの表面とほ
ぼ同一面に取９つけられた場合には、管板１の掲食によ
シ生じた腐食生成物４が冷却管２０入口をふさいだり、
管内ンζ侵入しＳ留して水の流れを妨ブたυする。しｌ
こがって第２図のように冷却管２の先端を管板ｌの表面
よシ突き出した方がこのような問題に対しては有効であ
る。一般に冷却器のような流水条件で使）Ｈされている
鉄製の管板１上の腐食生成物層の厚さは管板１の腐食前
の表面から数ｍｍ流水中に成長突出する。したがって、
この腐食生成物が冷却管２９入口をふさがない、あるい
は管内に侵入しないためには数頭以上冷却管２の先端を
管板ｌよｐも突き出させることが必要でモデル冷却器ニ
よる咲証試験の結果は表に示すよう［３−以上突き出さ
せると幼木がちることが確昭された。但し管板ｌ上の腐
食生成物層の厚さが１０龍を越えることはないのでそれ
以上突き出させても無意味である。したがって突龜出し
長さは！＝３〜１０１１１１１が適当である。Next, the protruding length l of the cooling tube 2 from the surface of the tube plate 10 will be explained. The protruding length of the cooling pipe 2 can be freely determined from the viewpoint of preventing corrosion caused by the front pipe and battery action. However, if the tip of the cold type tube is installed almost flush with the surface of the tube sheet 1 as shown in Figure 1, the corrosion products 4 generated by the corrosion of the tube sheet 1 will be absorbed into the cooling tube. 20 Blocking the entrance,
It enters the pipe and becomes S, blocking the flow of water. Shil
Therefore, it is more effective to solve this problem by having the tip of the cooling tube 2 protrude beyond the surface of the tube plate 1 as shown in FIG. Generally, the thickness of the corrosion product layer on the iron tube sheet 1 used under flowing water conditions such as in a cooler grows and protrudes several mm from the uncorroded surface of the tube sheet 1 into the flowing water. therefore,
In order to prevent this corrosion product from blocking the inlet of the cooling pipe 29 or invading into the pipe, it is necessary to make the tip of the cooling pipe 2 protrude beyond the tube plate l to p by several heads. The results are shown in the table [It was confirmed that young trees will fall if the tree is made to stick out more than 3. However, since the thickness of the corrosion product layer on the tube sheet l does not exceed 10 mm, it is pointless to make it protrude beyond that. Therefore, the protruding length is! =3 to 1011111 is appropriate.
表 冷却管の笑き出し長さとつま９の関係〔発明の効果
〕
以上のように本発明によれば管板と冷却管との接触によ
り生じる電池作用鵬食が防止でき、熱交換器の腐食寿命
がλ幅に同上する。叉、管板からの病食生成吻シζよる
冷却管のつまりもなくなるので、１′■却効率の・１戊
下を防止できる利点がある。Table Relationship between the opening length of the cooling pipe and the claw 9 [Effects of the invention] As described above, according to the present invention, corrosion due to battery action caused by contact between the tube sheet and the cooling pipe can be prevented, and corrosion of the heat exchanger can be prevented. The life span is the same as the λ width. Furthermore, the cooling tubes are no longer clogged by the phagocytosis generated from the tube plate, which has the advantage of preventing the cooling efficiency from decreasing by 1'.
第１図は従来の熱交換器の冷却管取付は部の肋面図、第
２図は本発明の一実施例を示″ｊ賛部１１＋面図、第３
図は鳥食試験結果を示すグラフでちる。
１・・管板、 ２・・・冷却も、
３・・−状腐食部、 ４・・間食生成物、５・・塗膜、
！・・突き出し長さ、
Ｍ・・面取シ〇
代理人 弁理士 則 近 憲 Ｅ（ほか１名）第１図
第３図
・−Fig. 1 is a side view of the cooling pipe installation section of a conventional heat exchanger, Fig. 2 shows an embodiment of the present invention;
The figure is a graph showing the results of the bird eating test. 1...Tube sheet, 2...Cooling, 3...-shaped corroded parts, 4...Snacking products, 5...Painting film,
!・・Protrusion length, M・・Chamfer 〇Representative Patent attorney Noriyuki Chika E (and 1 other person) Fig. 1 Fig. 3 -
Claims (4)
た管板と、この管板の前記貫通孔に挿入され前記管板の
表面よシも突出した端部を有する冷却管と、この冷却管
の端部およびこれを包囲する前記管板の表面に塗布され
た飯料とを備えたことを特徴とする熱交換器。(1) A tube sheet having a through hole and a chamfered end of the through hole, and an end portion inserted into the through hole of the tube sheet and protruding beyond the surface of the tube sheet. 1. A heat exchanger comprising a cooling pipe, and a coating applied to an end of the cooling pipe and a surface of the tube sheet surrounding the end.
を特徴とする特許請求の範囲第１項記載の熱交換器。(2) The heat exchanger according to claim 1, wherein the chamfer at the end of the through hole of the plate is 1C or more.
１Ｉ１１！ないし１０ｍ１１Ｌでおることを特徴とする
特許請求の範囲第１項記載の熱交換器。(3) According to the tube sheet table, the length of the protruding cooling pipe end is 31
1I11! 2. The heat exchanger according to claim 1, wherein the heat exchanger has a volume of 10 m to 11 L.
内でその面積は管板の、接水部面積の３０チ以下でらる
ことを特徴とする特許請求の範囲第１項記載の熱交換＠
。(4) The paint coating range is at least 2 mm below the outer surface of the cooling tube, and the area thereof is 30 inches or less of the water contact area of the tube plate. Heat exchange @
.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24097883A JPS60134197A (en) | 1983-12-22 | 1983-12-22 | Heat exchanger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24097883A JPS60134197A (en) | 1983-12-22 | 1983-12-22 | Heat exchanger |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS60134197A true JPS60134197A (en) | 1985-07-17 |
Family
ID=17067489
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24097883A Pending JPS60134197A (en) | 1983-12-22 | 1983-12-22 | Heat exchanger |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60134197A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1987001437A1 (en) * | 1985-08-31 | 1987-03-12 | Dipl.-Ing. Ernst Kreiselmaier Gmbh & Co. Wasser- U | Process for coating tube-sheets or similar for condensers, coolers, heat exchangers or similar with an anti-corrosion agent |
| KR20040029832A (en) * | 2002-10-02 | 2004-04-08 | 주식회사 경동보일러 | Corrosion Prevention Structure Of Heating Exchanger Composed Of Different Metal With Each Other At Condensing Gas Boiler |
-
1983
- 1983-12-22 JP JP24097883A patent/JPS60134197A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1987001437A1 (en) * | 1985-08-31 | 1987-03-12 | Dipl.-Ing. Ernst Kreiselmaier Gmbh & Co. Wasser- U | Process for coating tube-sheets or similar for condensers, coolers, heat exchangers or similar with an anti-corrosion agent |
| KR20040029832A (en) * | 2002-10-02 | 2004-04-08 | 주식회사 경동보일러 | Corrosion Prevention Structure Of Heating Exchanger Composed Of Different Metal With Each Other At Condensing Gas Boiler |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPH0448546B2 (en) | ||
| JPH03181797A (en) | Heat exchanger made of aluminum | |
| JPS60134197A (en) | Heat exchanger | |
| JPH0346547B2 (en) | ||
| JP3762146B2 (en) | Metal member joining structure and joining method | |
| US3953311A (en) | Cathodic protection system | |
| JPS61149794A (en) | Heat exchanger with treatment of inner surface | |
| US1821702A (en) | Conductor for heat exchange apparatus | |
| JPH11325792A (en) | Heat exchanger | |
| US4775004A (en) | Copper radiator for motor cars excellent in corrosion resistance and method of manufacturing | |
| JPS59131892A (en) | Heat exchanger | |
| US3872921A (en) | Erosion-corrosion resistant aluminum radiator clad tubing | |
| JPH0240422B2 (en) | NETSUKOKANKINOSEIZOHOHO | |
| JPH0115748B2 (en) | ||
| JP2003136286A (en) | Piping core in electric welding connection of hit-dip galvanized material for carbon steel pipe for piping, and inner surface corrosion preventive covering short pipe with gap adjustment function | |
| JPS5995397A (en) | Core of heat exchanger made of aluminum | |
| JPS5855698A (en) | Aluminum heat exchanger | |
| JPS636799B2 (en) | ||
| JPH0424319Y2 (en) | ||
| JP2532562Y2 (en) | Copper pipe fittings | |
| US4898318A (en) | Copper radiator for motor cars excellent in corrosion resistance and method of manufacturing the same | |
| JPS6350620Y2 (en) | ||
| JPS58136996A (en) | Heat exchanger | |
| CN2300069Y (en) | Volumetric heat exchanger | |
| JPS60129600A (en) | Heat exchanger for motorcar |