JPH039015A - Expansion joint for exhaust pipe - Google Patents
Expansion joint for exhaust pipeInfo
- Publication number
- JPH039015A JPH039015A JP1143278A JP14327889A JPH039015A JP H039015 A JPH039015 A JP H039015A JP 1143278 A JP1143278 A JP 1143278A JP 14327889 A JP14327889 A JP 14327889A JP H039015 A JPH039015 A JP H039015A
- Authority
- JP
- Japan
- Prior art keywords
- metal bellows
- exhaust pipe
- bellows
- expansion joint
- inner cylinder
- 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
- 229910052751 metal Inorganic materials 0.000 claims abstract description 61
- 239000002184 metal Substances 0.000 claims abstract description 61
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 8
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 8
- 229910052715 tantalum Inorganic materials 0.000 claims abstract description 8
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 6
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 5
- 239000000956 alloy Substances 0.000 claims abstract description 5
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 5
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 13
- 239000010955 niobium Substances 0.000 claims description 10
- 239000011651 chromium Substances 0.000 claims description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims description 5
- 239000011733 molybdenum Substances 0.000 claims description 5
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 4
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 claims description 4
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 claims description 4
- 238000005260 corrosion Methods 0.000 abstract description 29
- 230000007797 corrosion Effects 0.000 abstract description 29
- 229910052742 iron Inorganic materials 0.000 abstract description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 22
- 239000000203 mixture Substances 0.000 description 16
- 238000010586 diagram Methods 0.000 description 8
- 230000008602 contraction Effects 0.000 description 6
- 230000002093 peripheral effect Effects 0.000 description 6
- 229910001119 inconels 625 Inorganic materials 0.000 description 4
- 230000004580 weight loss Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000007654 immersion Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000005755 formation reaction Methods 0.000 description 2
- 239000004071 soot Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- 229910000963 austenitic stainless steel Inorganic materials 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 229910001026 inconel Inorganic materials 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L27/00—Adjustable joints, Joints allowing movement
- F16L27/12—Adjustable joints, Joints allowing movement allowing substantial longitudinal adjustment or movement
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B3/00—Engines characterised by air compression and subsequent fuel addition
- F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Joints Allowing Movement (AREA)
- Exhaust Silencers (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は排気管伸縮継手に関し、特に、蛇腹状の金属
ベローズと、この金属ベローズの内側に配置される円筒
とを具える排気管伸縮継手において、前記金属ベローズ
の寿命を向上させたものである。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an exhaust pipe expansion joint, and more particularly to an exhaust pipe expansion joint comprising an accordion-shaped metal bellows and a cylinder arranged inside the metal bellows. In the present invention, the life of the metal bellows is improved.
一般に、この種の排気管伸縮継手は、大型または中型の
ディーゼル機関（あるいはガソリン機関）に適用され、
一端のフランジがディーゼル機関の排気集合管に固定さ
れ、他端のフランジが排気管に固定されている。Generally, this type of exhaust pipe expansion joint is applied to large or medium-sized diesel engines (or gasoline engines),
The flange at one end is fixed to the exhaust manifold pipe of the diesel engine, and the flange at the other end is fixed to the exhaust pipe.
そして、２つのフランジの間には、筒形をなす蛇腹状の
金属ベローズが取り付けられ、金属ベローズの内側には
一方のフランジの内周面に一端が固定され他端が他方の
フランジの近傍に伸びた内筒が配置され、また金属ベロ
ーズの外側には、筒形をなすとともに他方のフランジの
外周面に一端が取り付けられ他端が一方のフランジの近
傍に伸びたカバーが設けられている。A cylindrical bellows-like metal bellows is attached between the two flanges, and one end is fixed to the inner peripheral surface of one flange and the other end is fixed to the inner peripheral surface of one flange. An elongated inner cylinder is disposed, and a cylindrical cover is provided on the outside of the metal bellows, with one end attached to the outer peripheral surface of the other flange and the other end extending near the one flange.
そして、このように構成された排気管伸縮継手は、ディ
ーゼル機関から排出された高温の排気ガスを、大気に放
出させるため排気管に導くものであり、その際、一方の
フランジが固定された排気集合管および他方のフランジ
が固定された排気管の熱膨張および振動等により、両方
のフランジは接近、離間して変位を生ずるが、前記金属
ベローズが蛇腹状に形成されているため、この変位は、
前記金属ベローズの伸縮によって吸収されるものである
。The exhaust pipe expansion joint configured in this way guides high-temperature exhaust gas discharged from a diesel engine to the exhaust pipe to be released into the atmosphere. Due to thermal expansion and vibration of the collecting pipe and the exhaust pipe to which the other flange is fixed, both flanges approach and move apart, causing displacement, but since the metal bellows is formed in a bellows shape, this displacement is ,
This is absorbed by the expansion and contraction of the metal bellows.
しかしながら、このような従来のものにあっては、ディ
ーゼル機関から排出された排気ガスの一部が、内筒の一
端とこの内筒が固着されていない方のフランジとの間の
隙間を通って、金属ベローズと内筒との間の空間部に進
入することが避けられないため、この空間部に侵入した
排気ガスにより金属ベローズが腐食される。However, in such conventional devices, a part of the exhaust gas discharged from the diesel engine passes through the gap between one end of the inner cylinder and the flange to which the inner cylinder is not fixed. Since the exhaust gas inevitably enters the space between the metal bellows and the inner cylinder, the metal bellows is corroded by the exhaust gas that enters this space.
すなわち排気ガス中に含まれるススと硫黄分と水分とに
よって生成される硫酸が金属ベローズを腐食させ、その
結果、短期間で金属ベローズに孔があき、その孔からガ
ス漏れを起こし、さらに、金属ベローズ自身の伸縮によ
る疲労でもガス漏れを起こすという問題点を有していた
。In other words, the sulfuric acid produced by the soot, sulfur, and moisture contained in the exhaust gas corrodes the metal bellows, and as a result, holes form in the metal bellows in a short period of time, gas leaks from the holes, and the metal There was a problem in that gas leakage occurred due to fatigue due to expansion and contraction of the bellows itself.
そして、前記金属ベローズの材料として、従来は一般的
にオーステナイト系ステンレス鋼が用いられているが、
これは排気ガスから生成される硫酸による腐食に対する
耐食性、特に耐孔食性についてはあまりよいものではな
かった。Conventionally, austenitic stainless steel has been generally used as the material for the metal bellows, but
This was not very good in terms of corrosion resistance, especially pitting corrosion resistance, against corrosion caused by sulfuric acid generated from exhaust gas.
本発明は前記のような従来のもののもつ問題点を解決し
て、排気ガスから生成される硫酸に対して腐食しにくく
、また伸縮に対して疲労しにくい長寿命の金属ベローズ
を有する排気管伸縮継手を提供することを目的とするも
のである。The present invention solves the above-mentioned problems of the conventional exhaust pipe, and provides an exhaust pipe that has a long-life metal bellows that is resistant to corrosion by sulfuric acid generated from exhaust gas and resistant to fatigue due to expansion and contraction. The purpose is to provide a joint.
〔課題を解決するための手段］
本発明は上記の問題点を解決するため、蛇腹状の金属ベ
ローズと、該金属ベローズの内側に配置された内筒とを
具え、該内筒の内部空間を排気ガスが通過するようにな
った排気管伸縮継手において、前記金属ベローズは、ニ
ッケル（Ｎｉ）が５０％以上、クロム（Ｃｒ）が１８％
〜２３％、モリブデン（Ｍｏ）が３％〜１０％、ニオブ
（Ｎｂ）とタンタル（Ｔａ）との合計が１％〜６％、さ
らに鉄（Ｆｅ）が少なくとも１％以上の成分の合金から
形成されるという手段を有している。[Means for Solving the Problems] In order to solve the above problems, the present invention includes an accordion-shaped metal bellows and an inner cylinder disposed inside the metal bellows, and the inner space of the inner cylinder is In the exhaust pipe expansion joint through which exhaust gas passes, the metal bellows contains 50% or more of nickel (Ni) and 18% of chromium (Cr).
~23%, molybdenum (Mo) from 3% to 10%, a total of niobium (Nb) and tantalum (Ta) from 1% to 6%, and iron (Fe) at least 1%. They have the means to do so.
本発明は前記のような手段を採用したことにより、金属
ベローズと内筒との間に形成される空間部へ排気ガスが
侵入し、金属ベローズの表面に排気ガスからの硫酸が生
成されても、金属ベローズはこれによって腐食されにく
く、さらに伸縮に対して疲労しにくいものとなる。By employing the above-mentioned means, the present invention prevents exhaust gas from entering the space formed between the metal bellows and the inner cylinder and generating sulfuric acid from the exhaust gas on the surface of the metal bellows. This makes the metal bellows less susceptible to corrosion and moreover less prone to fatigue due to expansion and contraction.
以下、本発明による排気管伸縮継手について、図面に従
って説明する。The exhaust pipe expansion joint according to the present invention will be described below with reference to the drawings.
第１図には本発明による排気管伸縮継手の実施例が示さ
れていて、この排気管伸縮継手は、大型または中型のデ
ィーゼル機関（あるいはガソリン機関）に適用されるも
のであって、一端のフランジ１はディーゼル機関の図示
しない排気集合管にボルト２で固定され、他端のフラン
ジ３は図示しない排気管にボルト４で固定されるように
なっている。FIG. 1 shows an embodiment of the exhaust pipe expansion joint according to the present invention, and this exhaust pipe expansion joint is applied to a large or medium-sized diesel engine (or gasoline engine). The flange 1 is fixed to an exhaust manifold (not shown) of a diesel engine with bolts 2, and the flange 3 at the other end is fixed to an exhaust pipe (not shown) with bolts 4.
フランジ１とフランジ３との間には、筒形をなす蛇腹状
の金属ベローズ５が取り付けられ、金属ベローズ５の内
側には、一方のフランジ３の内周面に一端を固着され他
端が他方のフランジ１の近傍まで伸びた内筒６が配置さ
れ、また金属ベローズ５の外側には、円筒形をなすとと
もに一部フランジ１の外周面に一端が取り付けられ他端
が他方のフランジ３の近傍まで伸びたカバー７が設けら
れている。A cylindrical bellows-like metal bellows 5 is attached between the flanges 1 and 3, and one end is fixed to the inner peripheral surface of one flange 3 and the other end is fixed to the inner peripheral surface of one flange 3. An inner cylinder 6 is arranged on the outside of the metal bellows 5 and has a cylindrical shape, with one end attached to the outer peripheral surface of the flange 1 and the other end near the other flange 3. A cover 7 is provided which extends up to the point where the cover 7 is extended.
そして、上記のように構成されている排気管伸縮継手に
設けられる金属ベローズ５は以下の化学組成で形成され
ている。（なお、本発明で使用する％は重量％を示す）
すなわち、ニッケル（Ｎｉ）が５０％以上、クロム（Ｃ
ｒ）が１８％〜２３％、モリブデン（ＭＯ）が３％〜１
０％、ニオブ（Ｎｂ）とタンタル（Ｔａ）との合計が１
％〜６％、そして鉄（Ｆｅ）が少なくとも１％以上の成
分からなる合金を用い、これを筒形の蛇腹状に形成した
。The metal bellows 5 provided in the exhaust pipe expansion joint configured as described above is formed with the following chemical composition. (Note that % used in the present invention indicates weight %.) That is, 50% or more of nickel (Ni) and 50% or more of chromium (C
r) from 18% to 23%, molybdenum (MO) from 3% to 1
0%, the total of niobium (Nb) and tantalum (Ta) is 1
% to 6% and iron (Fe) of at least 1% or more was used, and this was formed into a cylindrical bellows shape.
ここで前記Ｎｉは、５０％以上であればよいが、好まし
くは５５％〜６５％であり、前記Ｃｒは１８％〜２３％
であればよいが、好ましくは２０％〜２３％であり、前
記Ｍｏは３％〜１０％であればよいが、好ましくは８％
〜１０％であり、前記ＮｂとＴａは合計が１％〜６％で
あればよいが、好ましくは３％〜４％であり、前記Ｆｅ
は少なくとも１％以上であればよいが、好ましくは１％
〜５％であり、さらに、他の種類の金属も微量含まれて
いてもよいものであり、この組成の範囲のものとしては
、たとえばインコネル合金（インコネル６２５）を挙げ
るこ々ができる。Here, the Ni may be 50% or more, preferably 55% to 65%, and the Cr may be 18% to 23%.
The Mo content is preferably 20% to 23%, and the Mo content is preferably 3% to 10%, but preferably 8%.
10%, the total amount of Nb and Ta may be 1% to 6%, preferably 3% to 4%, and the Fe
may be at least 1% or more, but preferably 1%
~5%, and may also contain trace amounts of other metals, such as Inconel alloy (Inconel 625), which has a composition within this range.
次に、前記の排気管伸縮継手の作用について説明する。Next, the function of the exhaust pipe expansion joint will be explained.
ディーゼル機関から排出された高温の排気ガスは第１図
に示す矢印にしたがって排気管（図示せず）に導かれて
大気に放出されるが、その際フランジ１が固定された排
気集合管およびフランジ３が固定された排気管の熱膨張
および振動等により、両フランジｌ、３は接近・離間し
て変位を生ずるが、この変位は金属ベローズ５が蛇腹状
に形成されているので、前記金属ベローズ５が伸縮する
ことで吸収される。High-temperature exhaust gas discharged from a diesel engine is guided to an exhaust pipe (not shown) according to the arrow shown in Fig. 1 and released into the atmosphere. Due to thermal expansion and vibration of the exhaust pipe to which the metal bellows 5 is fixed, the flanges 1 and 3 move toward and away from each other and are displaced. 5 is absorbed by expanding and contracting.
この際、金属ベローズ５と内筒６との間に形成される空
間部８に、内筒６の下端とフランジ１との間の隙間から
Ａに示す矢印にしたがって排気ガスが侵入し、金属ベロ
ーズ５の内周面の表面に付着、堆積し、排気ガス中のス
スに含まれる硫黄分と水分とによって硫酸を生成し、こ
の硫酸は前記金属ベローズ５を腐食しようとするが、前
記金属ベローズ５は前記の組成の合金で形成されている
ため、硫酸に対する耐食性が大幅に向上しており、腐食
されに＜＜、長寿命となり、したがって排気管伸縮継手
も長寿命になるものである。At this time, exhaust gas enters the space 8 formed between the metal bellows 5 and the inner cylinder 6 from the gap between the lower end of the inner cylinder 6 and the flange 1 according to the arrow A, and the metal bellows Sulfuric acid is produced by the sulfur content and moisture contained in the soot in the exhaust gas, and this sulfuric acid tends to corrode the metal bellows 5, but the metal bellows 5 Since the exhaust pipe expansion joint is made of an alloy having the above-mentioned composition, its corrosion resistance against sulfuric acid is greatly improved, and the exhaust pipe expansion joint has a long life without being corroded.
次に、本発明による組成の金属ベローズの耐食性を調べ
るために腐食実験を行ったが、以下その過程について説
明する。Next, a corrosion experiment was conducted to examine the corrosion resistance of the metal bellows having the composition according to the present invention, and the process will be explained below.
まず、試験片として、従来の組成で形成される試料１（
この場合、５ＵＳ３１６Ｌ）と、本発明の組成で形成さ
れる試料２（この場合、インコネル６２５ （Ｎｉ６０
．７％、Ｃｒ２１．３％、Ｍｏ９．１％、ＮｂとＴａと
の合計が３．５％、Ｆｅ４．６％）とを用い、これらを
９８重量％の濃硫酸の中に温度１１０°Ｃ〜１２０°Ｃ
で浸漬して腐食させ、所定の時間が経過した後に引き上
げて減少重量を計測した。First, as a test piece, sample 1 (
In this case, Inconel 625 (Ni60
．． 7% Cr, 21.3% Mo, 9.1% Mo, the total of Nb and Ta 3.5%, and Fe 4.6%) were placed in 98% by weight concentrated sulfuric acid at a temperature of 110°C to 120°C
After a predetermined period of time had elapsed, it was pulled out and the weight loss was measured.
ここで、試料１および試料２を腐食させるのに濃硫酸を
使用したのは、実際の排気管伸縮継手の使用状態に短時
間でより近い状態となるよう腐食を行わせるためである
。Here, the reason why concentrated sulfuric acid was used to corrode Samples 1 and 2 was to corrode them in a short time to bring them closer to the conditions in which the exhaust pipe expansion joints are actually used.
そしてこの結果、第２回に示すような試料１および試料
２の重量の減少が確認された。As a result, it was confirmed that the weights of Sample 1 and Sample 2 decreased as shown in the second test.
第２図において、グラフ■は試料１の減少重量を示し、
グラフ■は試料２の減少重量を示すものであり、試料２
は試料１に比べ、減少重量が少なく、したがって試料１
に比べて耐食性がすくれていることがわかる。In Figure 2, graph ■ indicates the weight loss of sample 1;
Graph ■ shows the weight loss of sample 2.
Compared to sample 1, the weight loss is less, so sample 1
It can be seen that the corrosion resistance is lower than that of .
さらに、濃硫酸に浸漬後の試料１および試料２の表面の
腐食による孔の形成状態を目視で観察した。その結果を
第３図および第４図に示す。Furthermore, the formation of holes due to corrosion on the surfaces of Samples 1 and 2 after immersion in concentrated sulfuric acid was visually observed. The results are shown in FIGS. 3 and 4.
こごで、第４図に示される試料２の表面に腐食により形
成された凹部１０は、第３図に示される試料１の表面に
腐食により形成された凹部９と比べ、大きさが小さいと
ともに単位面積当たりの形成数が少なく、したがって本
発明による組成の試料２の方が従来の組成の試料ｌに比
べて硫酸に対する耐食性、特に耐孔食性がすぐれている
ことがわかる。Here, the recess 10 formed by corrosion on the surface of sample 2 shown in FIG. 4 is smaller in size and larger than the recess 9 formed by corrosion on the surface of sample 1 shown in FIG. It can be seen that the number of formations per unit area is small, and therefore Sample 2 having the composition according to the present invention has better corrosion resistance against sulfuric acid, especially pitting corrosion resistance, than Sample 1 having the conventional composition.
次に、実際の条件下において本発明による組成の金属ベ
ローズの腐食状態と従来の組成の金属ベローズの腐食状
態とを比較するため、前記２つの金属ベローズをそれぞ
れ用いた排気管伸縮継手を用意し、それぞれ実際に排気
管に配設して排気ガスを導き、この排気ガスによりそれ
ぞれの排気管伸縮継手内の金属ベローズを腐食させた。Next, in order to compare the corrosion state of the metal bellows with the composition according to the present invention and the corrosion state of the metal bellows with the conventional composition under actual conditions, exhaust pipe expansion joints using each of the above two metal bellows were prepared. , were actually installed in the exhaust pipes to guide the exhaust gas, and the metal bellows inside each exhaust pipe expansion joint was corroded by the exhaust gas.
そしてその結果、従来の組成の金属ベローズの腐食状態
の模式図を第５図に示し、本発明による組成の金属ベロ
ーズの腐食状態の模式図を第６図に示す。As a result, a schematic diagram of the corrosion state of a metal bellows with a conventional composition is shown in FIG. 5, and a schematic diagram of a corrosion state of a metal bellows with a composition according to the present invention is shown in FIG.
ここで、第６図に示される本発明の化学組成による金属
ベローズの表面に、腐食により形成された凹部１２は、
第５図に示される従来の組成による金属ベローズの表面
に、腐食により形成された凹部１１と比べ、大きさが小
さいとともに単位面積当たりの形成数が少ない。Here, the recesses 12 formed by corrosion on the surface of the metal bellows having the chemical composition of the present invention shown in FIG.
Compared to the recesses 11 formed by corrosion on the surface of the metal bellows with the conventional composition shown in FIG. 5, the recesses 11 are smaller in size and formed in fewer numbers per unit area.
したがって実際の条件下においても、本発明による組成
の金属ベローズは、従来の組成の金属ベローズよりも耐
食性、特に耐孔食性がすぐれていることがわかる。Therefore, it can be seen that even under actual conditions, the metal bellows having the composition according to the present invention has better corrosion resistance, especially pitting corrosion resistance, than metal bellows having the conventional composition.
また、耐食性のほか、本発明による組成の金属ベローズ
は、従来の組成の金属ベローズに比して機械的強度も強
く、伸縮に対して疲労しにくいものである。In addition to corrosion resistance, the metal bellows having the composition according to the present invention also has higher mechanical strength than metal bellows having the conventional composition, and is resistant to fatigue due to expansion and contraction.
すなわち、従来の金属ベローズの材料としてたとえば５
ＵＳ３１６Ｌと、本発明による金属ベローズの材料とし
てたとえばインコネル６２５とを機械的強度において比
較した場合、インコネル６２５は５ＵＳ３１６Ｌの約１
．５倍の機械的強度を有している。That is, as a material for conventional metal bellows, for example, 5
When comparing US316L and, for example, Inconel 625 as a material for the metal bellows according to the present invention in terms of mechanical strength, Inconel 625 has a mechanical strength that is approximately 1 that of 5US316L.
．． It has five times the mechanical strength.
１
したがって、前記金属ベローズは耐食性にすぐれている
とともに伸縮に対して疲労しにくく、寿命が長くなり、
この金属ベローズを有する排気管伸縮継手自身の寿命が
長寿命になることとなる。1. Therefore, the metal bellows has excellent corrosion resistance, is resistant to fatigue due to expansion and contraction, and has a long life.
The exhaust pipe expansion joint itself having this metal bellows has a long lifespan.
この発明は、蛇腹状の金属ベローズと、該金属ベローズ
の内側に配置された内筒とを具え、該内筒の内部空間を
排気ガスが通過するようになった排気管伸縮継手におい
て、前記金属ベローズは、ニッケル（Ｎｉ）が５０％以
上、クロム（Ｃｒ）が１８％〜２３％、モリブデン（Ｍ
Ｏ）が３％〜１０％、ニオブ（Ｎｂ）とタンタル（Ｔａ
）との合計が１％〜６％、さらに鉄（Ｆｅ）が少なくと
も１％以上の成分の合金から形成されるとしたことで、
排気管伸縮継手において金属ベローズの耐食性、特に耐
孔食性が向上し、また機械的強度が向上し、したがって
金属ベローズの寿命が長くなって排気管伸縮継手の寿命
が長くなるなどのすぐれた効果を有２
するものである。The present invention provides an exhaust pipe expansion joint comprising a bellows-shaped metal bellows and an inner cylinder disposed inside the metal bellows, and in which exhaust gas passes through an internal space of the inner cylinder. The bellows contains 50% or more of nickel (Ni), 18% to 23% of chromium (Cr), and molybdenum (M
O) is 3% to 10%, niobium (Nb) and tantalum (Ta
), the total of which is 1% to 6%, and furthermore, iron (Fe) is at least 1% or more.
In exhaust pipe expansion joints, the corrosion resistance, especially the pitting corrosion resistance, of metal bellows is improved, and the mechanical strength is also improved, resulting in a longer lifespan of the metal bellows, resulting in excellent effects such as a longer lifespan of exhaust pipe expansion joints. Yes 2.
第１図は本発明による排気管伸縮継手の断面図、第２図
は濃硫酸による腐食試験の重量変化を表す図、第３図は
濃硫酸浸漬後の試料１の表面の模式図、第４図は濃硫酸
浸漬後の試料２の表面の模式図、第５図は従来の排気管
伸縮継手における金属ベローズの表面を表す模式図、第
６図は本発明による排気管伸縮継手における金属ベロー
ズの表面を表す模式図である。
第１図
１．３・・・・・・フランジ
２．４・・・・・・ボルト
５・・・・・・金属ベローズ
６・・・・・・内筒
７・・・・・・カバー
８・・・・・・空間部
９．１０．１１．１２・・・・・・凹部Ｉ、■・・・・
・・グラフ
第５図
１１５Figure 1 is a cross-sectional view of the exhaust pipe expansion joint according to the present invention, Figure 2 is a diagram showing the weight change in a corrosion test with concentrated sulfuric acid, Figure 3 is a schematic diagram of the surface of sample 1 after immersion in concentrated sulfuric acid, and Figure 4 The figure is a schematic diagram of the surface of sample 2 after immersion in concentrated sulfuric acid, Figure 5 is a schematic diagram showing the surface of a metal bellows in a conventional exhaust pipe expansion joint, and Figure 6 is a diagram showing the surface of a metal bellows in an exhaust pipe expansion joint according to the present invention. It is a schematic diagram showing a surface. Fig. 1 1.3...Flange 2.4...Bolt 5...Metal bellows 6...Inner cylinder 7...Cover 8・・・・・・Space part 9.10.11.12・・・Concave part I,■・・・・
...Graph Figure 5 115
Claims (1)
に配置された内筒とを具え、該内筒の内部空間を排気ガ
スが通過するようになった排気管伸縮継手において、前
記金属ベローズは、ニッケル（Ｎｉ）が５０％以上、ク
ロム（Ｃｒ）が１８％〜２３％、モリブデン（Ｍｏ）が
３％〜１０％、ニオブ（Ｎｂ）とタンタル（Ｔａ）との
合計が１％〜６％、さらに鉄（Ｆｅ）が少なくとも１％
以上の成分の合金から形成されることを特徴とする排気
管伸縮継手。(1) An exhaust pipe expansion joint comprising a bellows-shaped metal bellows and an inner cylinder disposed inside the metal bellows, and in which exhaust gas passes through an internal space of the inner cylinder, wherein the metal bellows is 50% or more of nickel (Ni), 18% to 23% of chromium (Cr), 3% to 10% of molybdenum (Mo), and 1% to 6% of the total of niobium (Nb) and tantalum (Ta). %, and at least 1% iron (Fe)
An exhaust pipe expansion joint characterized by being formed from an alloy of the above components.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1143278A JPH039015A (en) | 1989-06-06 | 1989-06-06 | Expansion joint for exhaust pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1143278A JPH039015A (en) | 1989-06-06 | 1989-06-06 | Expansion joint for exhaust pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH039015A true JPH039015A (en) | 1991-01-16 |
| JPH05532B2 JPH05532B2 (en) | 1993-01-06 |
Family
ID=15335022
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1143278A Granted JPH039015A (en) | 1989-06-06 | 1989-06-06 | Expansion joint for exhaust pipe |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH039015A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5658024A (en) * | 1995-02-17 | 1997-08-19 | Bachmann Inc. | Expansion joint with a sloped cavity and improved fabric clamping |
| EP1227292A3 (en) * | 2001-01-30 | 2005-09-28 | Elf Antar France | Device for reducing clogging of a shell-and-tube heat exchanger |
| JP4605487B1 (en) * | 2010-03-10 | 2011-01-05 | 定史 芳川 | Hangers for kimono display |
| KR20160074293A (en) * | 2014-12-18 | 2016-06-28 | 김종필 | bunk bed with hanger |
-
1989
- 1989-06-06 JP JP1143278A patent/JPH039015A/en active Granted
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5658024A (en) * | 1995-02-17 | 1997-08-19 | Bachmann Inc. | Expansion joint with a sloped cavity and improved fabric clamping |
| EP1227292A3 (en) * | 2001-01-30 | 2005-09-28 | Elf Antar France | Device for reducing clogging of a shell-and-tube heat exchanger |
| JP4605487B1 (en) * | 2010-03-10 | 2011-01-05 | 定史 芳川 | Hangers for kimono display |
| JP2011183008A (en) * | 2010-03-10 | 2011-09-22 | Sadafumi Yoshikawa | Kimono display hanger |
| KR20160074293A (en) * | 2014-12-18 | 2016-06-28 | 김종필 | bunk bed with hanger |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05532B2 (en) | 1993-01-06 |
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