JP2006118656A - Heat insulating multilayered pipe - Google Patents

Heat insulating multilayered pipe Download PDF

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JP2006118656A
JP2006118656A JP2004308975A JP2004308975A JP2006118656A JP 2006118656 A JP2006118656 A JP 2006118656A JP 2004308975 A JP2004308975 A JP 2004308975A JP 2004308975 A JP2004308975 A JP 2004308975A JP 2006118656 A JP2006118656 A JP 2006118656A
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stainless steel
thread
heat insulating
yarn
pipe
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Hiroshi Funahashi
博 舟橋
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Hino Motors Ltd
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Hino Motors Ltd
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<P>PROBLEM TO BE SOLVED: To secure a heat insulating property and a heat retaining property by preventing breaking of a heat insulating cylindrical object during bending. <P>SOLUTION: The heat insulating multilayered pipe is provided with a metal inner pipe 11, a metal outer pipe 12 fit in a predetermined gap d opened in the inner pipe, and the heat insulating cylindrical object 13 interposed in the predetermined gap. The heat insulating cylindrical object is formed by braiding a thread 14a comprising stainless steel, and a thread 14b comprising glass fiber. The heat insulating cylindrical object is formed by braiding braiding threads with two to twenty threads aligned in parallel with each other like a plain weave, and one to five of the threads comprises stainless steel. An outer diameter of the inner pipe is 25-120 mm, the predetermined gap is 0.5-5 mm, a thickness of the thread comprising stainless steel is 2.4-0.1 mm, a thickness of the thread comprising glass fiber is 2.4-0.1 mm, and a ratio of the thickness of the thread comprising glass fiber with respect to a thickness of the thread comprising stainless steel is 0.5-2. The threads comprising stainless steel are arranged in the center of the braiding threads. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、自動車用の排気管などの使用される曲げ加工に適した断熱複層管に関するものである。   The present invention relates to a heat insulating multilayer tube suitable for bending work used for an exhaust pipe for automobiles and the like.

従来、自動車の排気管には、排気管の外表面が高温にならないこと、即ち断熱性が高いことが要求され、その外表面の温度が高いことに起因する不具合を回避する必要がある。また、排気ガスを浄化するための触媒を排ガス経路に設けた場合には、この触媒はより高温下におかれる方が触媒の効率がよいことから、排ガスの温度を低下させることなく排ガスを触媒に送込む必要があり、保温性が高い排気管であることも要求されている。そして、このような要求を満足する排気管としては、金属製内管と、その内管に所定の隙間をあけて嵌入された金属製外管とからなる２重管が有効とされている。   2. Description of the Related Art Conventionally, an exhaust pipe of an automobile is required to have a high temperature on the outer surface of the exhaust pipe, that is, to have a high heat insulating property, and it is necessary to avoid problems caused by the high temperature of the outer surface. In addition, when a catalyst for purifying exhaust gas is provided in the exhaust gas path, it is more efficient to place the catalyst at a higher temperature, so that the exhaust gas can be catalyzed without lowering the temperature of the exhaust gas. It is necessary to be an exhaust pipe having high heat retention. As an exhaust pipe satisfying such a requirement, a double pipe comprising a metal inner pipe and a metal outer pipe fitted with a predetermined gap in the inner pipe is effective.

一方、排気管は、エンジンから車体後尾まで配設され、その間に存在する障害物を回避する等の目的で適宜折曲げられる。しかし、２重管をその内径を維持した状態で単純に折曲げると、折曲げられた部分で内管と外管が接触してその部分における熱伝導率が上昇し、断熱性及び保温性が悪化する不具合がある。
この点を解消して断熱性及び保温性が悪化させることなく折曲げ得るものとして、内管と外管の間の所定の隙間に断熱用筒状物を介装させた断熱複層管が提案されている（例えば、特許文献１参照。）。この断熱複層管では、内管と外管の間の所定の隙間に介装された断熱用筒状物が、折曲げ時に内管と外管が部分的に接触するようなことを回避して、断熱性及び保温性が悪化することを防止できるものとしている。
特開昭５８−２１０９６号公報（特許請求の範囲） On the other hand, the exhaust pipe is disposed from the engine to the rear of the vehicle body, and is appropriately bent for the purpose of avoiding obstacles existing therebetween. However, when the double pipe is simply bent while maintaining its inner diameter, the inner pipe and the outer pipe are in contact with each other at the bent portion, and the thermal conductivity in that portion increases, and the heat insulation and heat retention are improved. There is a problem that gets worse.
Proposed a heat insulation multi-layer pipe with heat insulation tubular material interposed in a predetermined gap between the inner pipe and the outer pipe as a thing that can bend without eliminating this point and deteriorating the heat insulation and heat retention. (For example, refer to Patent Document 1). In this heat insulating multi-layer pipe, the heat insulating cylindrical member interposed in the predetermined gap between the inner pipe and the outer pipe avoids partial contact between the inner pipe and the outer pipe during bending. Therefore, it is possible to prevent the heat insulation and heat retention from deteriorating.
Japanese Patent Laid-Open No. 58-2196 (Claims)

しかし、上記従来の複層管では断熱用筒状物としてセラミッククロスを用いており、折曲げ部分に比較的大きな力が加わる比較的内径の大きな複層管では、その折曲げ時にセラミッククロス自体が潰されて内管と外管が接触し、その内管と外管が接触することに起因して複層管の断熱性及び保温性を十分に確保できなくなるという未だ解決すべき課題が残存していた。
本発明の目的は、折曲げ時における断熱用筒状物の破壊を防止して断熱性及び保温性を十分に確保し得る断熱複層管を提供することにある。 However, the above-mentioned conventional multi-layer pipe uses a ceramic cloth as a tubular material for heat insulation. In a multi-layer pipe having a relatively large inner diameter in which a relatively large force is applied to the bent portion, the ceramic cloth itself is not bent. There is still a problem to be solved that the inner tube and the outer tube are crushed and the inner tube and the outer tube are in contact with each other, so that the heat insulation and heat retention of the multilayer tube cannot be sufficiently secured. It was.
An object of the present invention is to provide a heat insulating multi-layer pipe that can sufficiently prevent heat and heat retention by preventing breakage of a heat insulating cylindrical body during bending.

請求項１に係る発明は、図１に示すように、金属製内管１１と、内管１１に所定の隙間をあけて嵌入された金属製外管１２と、内管１１と外管１２の間の所定の隙間に介装された断熱用筒状物１３とを備えた断熱複層管の改良である。
その特徴ある構成は、断熱用筒状物１３がステンレス鋼からなる糸１４ａとガラス繊維からなる糸１４ｂを編んで形成されたところにある。
この請求項１に記載された断熱複層管では、内管１１と外管１２の間の所定の隙間に介装された断熱用筒状物１３がその間に位置して、折曲げ時に内管１１と外管１２が接触することを防止する。ここで、断熱用筒状物１３は機械的強度が比較的高いステンレス鋼からなる糸１４ａと機械的強度は劣るけれどもに熱伝導率の低いガラス繊維からなる糸１４ｂを編んで形成されており、ステンレス鋼からなる糸１４ａが主として内管１１と外管１２との接触を防止してガラス繊維からなる糸１４ｂが破壊されることを回避する。この結果、折曲げ時における断熱用筒状物の破壊は防止され、複層管の断熱性及び保温性が悪化することを防止する。 As shown in FIG. 1, the invention according to claim 1 includes a metal inner tube 11, a metal outer tube 12 fitted in the inner tube 11 with a predetermined gap, and an inner tube 11 and an outer tube 12. It is improvement of the heat insulation multilayered tube provided with the cylindrical object 13 for heat insulation interposed by the predetermined clearance gap between them.
The characteristic configuration is that the heat insulating cylinder 13 is formed by knitting a thread 14a made of stainless steel and a thread 14b made of glass fiber.
In the heat insulating multi-layer pipe described in claim 1, the heat insulating cylinder 13 interposed in the predetermined gap between the inner pipe 11 and the outer pipe 12 is located between the inner pipe 11 and the inner pipe at the time of bending. 11 and the outer tube 12 are prevented from contacting each other. Here, the tubular body 13 for heat insulation is formed by knitting a yarn 14a made of stainless steel having a relatively high mechanical strength and a yarn 14b made of glass fiber having a low thermal conductivity although the mechanical strength is inferior, The thread 14a made of stainless steel mainly prevents contact between the inner tube 11 and the outer tube 12, and the yarn 14b made of glass fiber is prevented from being broken. As a result, destruction of the heat insulating cylinder during bending is prevented, and deterioration of the heat insulation and heat retention of the multilayer tube is prevented.

請求項２に係る発明は、請求項１に係る発明であって、更に図２に示すように、断熱用筒状物１３は、２〜２０本の糸１４ａ，１４ｂを並列に引揃えた組み糸１４を平織状に編んで形成され、組み糸１４の内の１〜５本がステンレス鋼からなる糸１４ａであって残りがガラス繊維からなる糸１４ｂであることを特徴とする。
この請求項２に記載された断熱複層管では、組み糸１４の内の１〜５本が熱伝導率の高いステンレス鋼からなる糸１４ａであって残りは熱伝導率の低いガラス繊維からなる糸１４ｂであるので、内管１１又は外管１２に直接接触するステンレス鋼からなる糸１４ａの割合を減少させることができる。また、断熱用筒状物１３はこの組み糸１４を平織状に編んで形成されるため、内管１１又は外管１２に直接接触したステンレス鋼からなる糸１４ａが互いに接触して内管１１と外管１２とを直接的に連結する部分は更に減少し、折曲げ時における断熱用筒状物１３の破壊を有効に防止しつつ、断熱性及び保温性を十分に確保することができる。
ここで、組み糸１４は、それを構成する糸１４ａ，１４ｂが２本未満であると遮熱の不具合があり、２０本を越えると曲げ加工時の乗り上がりから過密となり潰される不具合がある。また、組み糸１４の内のステンレス鋼からなる糸１４ａが存在しないとガラス繊維からなる糸１４ｂのみとなり、曲げ加工時に潰される不具合があり、６本を越えると接触箇所が増加し熱伝導率が増加して断熱効果が減少する不具合がある。 The invention according to claim 2 is the invention according to claim 1, and further, as shown in FIG. 2, the heat insulating cylinder 13 is a set in which 2 to 20 yarns 14 a and 14 b are arranged in parallel. The yarn 14 is formed by knitting in a plain weave shape, and 1 to 5 of the braided yarns 14 are yarns 14a made of stainless steel and the rest are yarns 14b made of glass fiber.
In the heat insulating multilayer tube described in claim 2, 1 to 5 of the braided yarns 14 are yarns 14a made of stainless steel having a high thermal conductivity, and the rest are made of glass fibers having a low thermal conductivity. Since it is the thread | sled 14b, the ratio of the thread | yarn 14a which consists of stainless steel which directly contacts the inner tube | pipe 11 or the outer tube | pipe 12 can be reduced. Further, since the tubular body 13 for heat insulation is formed by knitting the braided yarn 14 into a plain weave shape, the thread 14a made of stainless steel that is in direct contact with the inner tube 11 or the outer tube 12 comes into contact with the inner tube 11 and the inner tube 11. The portion directly connected to the outer tube 12 is further reduced, and it is possible to sufficiently ensure the heat insulating property and the heat retaining property while effectively preventing the heat insulating tubular member 13 from being broken at the time of bending.
Here, if the braided yarn 14 has less than two yarns 14a, 14b, there is a problem of heat insulation, and if it exceeds 20, the problem arises that the braided yarn 14 becomes overcrowded from being crushed during bending. Further, if there is no stainless steel yarn 14a in the braided yarn 14, there is only a yarn 14b made of glass fiber, and there is a problem that it is crushed during bending, and if it exceeds six, the number of contact points increases and the thermal conductivity increases. There is a problem that the heat insulation effect decreases and increases.

請求項３に係る発明は、請求項２に係る発明であって、更に図３に示すように、内管１１の外径Ｄ1が２５ｍｍ〜１２０ｍｍであって所定の隙間ｄが０．５ｍｍ〜５．０ｍｍであり、ステンレス鋼からなる糸１４ａの太さａ1が２．４ｍｍ〜０．１ｍｍであってガラス繊維からなる糸１４ｂの太さａ2が２．４ｍｍ〜０．１ｍｍであり、かつステンレス鋼からなる糸１４ａの太さに対するガラス繊維からなる糸１４ｂの太さの比ａ2／ａ1が０．５〜２であることを特徴とする。
この請求項３に記載された断熱複層管では、内管１１の外径が２５ｍｍ〜１２０ｍｍであるような比較的大径なものであっても、所定の隙間ｄを０．５ｍｍ〜５．０ｍｍとし、その内管１１と外管１２との接触を主として防止する断熱用筒状物１３のステンレス鋼からなる糸１４ａの太さａ1を２．４ｍｍ〜０．１ｍｍとすることにより、折曲げ時における内管１１と外管１２との間の所定の隙間を維持して断熱性及び保温性が悪化することを有効に防止する。そして、ガラス繊維からなる糸１４ｂの太さａ2を２．４ｍｍ〜０．１ｍｍとし、ステンレス鋼からなる糸１４ａの太さに対するガラス繊維からなる糸１４ｂの太さの比ａ2／ａ1を０．５〜２とすることにより、ガラス繊維からなる糸１４ｂが破壊されることを回避して、必要とする断熱性及び保温性を有効に確保する。 The invention according to claim 3 is the invention according to claim 2, and further, as shown in FIG. 3, the outer diameter D 1 of the inner tube 11 is 25 mm to 120 mm and the predetermined gap d is 0.5 mm to The thickness a 1 of the thread 14a made of stainless steel is 2.4 mm to 0.1 mm, and the thickness a 2 of the thread 14b made of glass fiber is 2.4 mm to 0.1 mm, The ratio a 2 / a 1 of the thickness of the yarn 14b made of glass fiber to the thickness of the yarn 14a made of stainless steel is 0.5-2.
In the heat insulating multilayer tube described in claim 3, even if the inner tube 11 has a relatively large diameter such that the outer diameter is 25 mm to 120 mm, the predetermined gap d is set to 0.5 mm to 5. The thickness a 1 of the thread 14a made of stainless steel of the tubular member 13 for heat insulation that mainly prevents contact between the inner tube 11 and the outer tube 12 is set to 2.4 mm to 0.1 mm. A predetermined gap between the inner tube 11 and the outer tube 12 at the time of bending is maintained to effectively prevent deterioration of heat insulation and heat retention. The thickness a 2 of the yarn 14b made of glass fiber is set to 2.4 mm to 0.1 mm, and the ratio a 2 / a 1 of the thickness of the yarn 14b made of glass fiber to the thickness of the yarn 14a made of stainless steel is set to By setting it as 0.5-2, it avoids that the thread | yarn 14b which consists of glass fibers is destroyed, and ensures the required heat insulation and heat retention effectively.

ここで、内管１１の外径が２５ｍｍ未満であると小さすぎる不具合があり、１２０ｍｍを越えると需要が減少する不具合がある。そして、この内管１１の外径は４０〜１１０ｍｍであることが更に好ましい。また、所定の隙間ｄが０．５ｍｍ未満であるとステンレス鋼からなる糸１４ａとガラス繊維からなる糸１４ｂの双方を細くする必要があり、それらが曲げ加工時に潰れる不具合があり、５ｍｍを越えると周囲のスペースを取り過ぎる不具合がある。そして、この所定の隙間ｄは１〜３ｍｍであることが更に好ましい。また、ステンレス鋼からなる糸１４ａの太さ及びガラス繊維からなる糸の太さが０．１ｍｍ未満であると断熱複層管の断熱性及び保温性が悪化し、それらの糸の太さが２．４ｍｍを越えると剛性が高すぎて曲げ加工のための荷重が増大する不具合がある。更に、ステンレス鋼からなる糸の太さに対するガラス繊維からなる糸の太さの比ａ2／ａ1が０．５未満であると所定の隙間ｄにおける断熱用筒状物１３の占める割合が減少して断熱複層管の断熱性及び保温性が悪化し、その比ａ2／ａ1が２を越えると折り曲げ時にガラス繊維からなる糸１４ｂが重なり、潰されて破壊されるおそれがある。そして、その比ａ2／ａ1は１〜２であることが更に好ましい。 Here, when the outer diameter of the inner tube 11 is less than 25 mm, there is a problem that it is too small, and when it exceeds 120 mm, there is a problem that demand decreases. The outer diameter of the inner tube 11 is more preferably 40 to 110 mm. Further, if the predetermined gap d is less than 0.5 mm, both the thread 14a made of stainless steel and the thread 14b made of glass fiber need to be thinned, and there is a problem that they are crushed during bending, and if it exceeds 5 mm. There is a problem that takes up too much space. The predetermined gap d is more preferably 1 to 3 mm. Further, if the thickness of the thread 14a made of stainless steel and the thickness of the thread made of glass fiber are less than 0.1 mm, the heat insulation and heat retention of the heat insulating multilayer tube deteriorate, and the thickness of these threads is 2 If the thickness exceeds 4 mm, the rigidity is too high and the load for bending increases. Furthermore, the proportion of the heat insulating tubular material 13 is reduced and the ratio a 2 / a 1 of the thickness of the yarn made of glass fiber is less than 0.5 in the predetermined gap d for the thickness of the yarn made of stainless steel If the ratio a 2 / a 1 exceeds 2, the yarn 14b made of glass fibers may overlap and be crushed and destroyed when the ratio a 2 / a 1 exceeds 2. The ratio a 2 / a 1 is more preferably 1 to 2.

請求項４に係る発明は、請求項２又は３に係る発明であって、図２に示すように、ステンレス鋼からなる１〜５本の糸１４ａが組み糸１４の中央に並べられたことを特徴とする。
この請求項４に記載された断熱複層管では、内管１１と外管１２との接触を主として防止する断熱用筒状物１３のステンレス鋼からなる１〜５本の糸１４ａを組み糸１４の中央に並べるので、この複層管１０を折曲げるときに単一のステンレス鋼からなる糸１４ａが受ける圧縮力を低減させることができ、それぞれのステンレス鋼からなる糸１４ａの機械的変形量を減少させて内管１１と外管１２との間の所定の隙間を確実に維持する。 The invention according to claim 4 is the invention according to claim 2 or 3, wherein 1 to 5 yarns 14a made of stainless steel are arranged in the center of the braid 14 as shown in FIG. Features.
In the heat insulation multilayer pipe described in claim 4, 1 to 5 yarns 14a made of stainless steel of the heat insulating tubular body 13 which mainly prevents the contact between the inner tube 11 and the outer tube 12 are assembled. Therefore, when the multilayer tube 10 is bent, the compressive force applied to the single stainless steel thread 14a can be reduced, and the amount of mechanical deformation of each stainless steel thread 14a can be reduced. The predetermined gap between the inner tube 11 and the outer tube 12 is surely maintained by decreasing.

本発明の断熱複層管では、断熱用筒状物がステンレス鋼からなる糸とガラス繊維からなる糸を編んで形成したので、内管と外管の間の所定の隙間に介装された断熱用筒状物がその間に位置して、折曲げ時に内管と外管が接触することを防止する。ここで、断熱用筒状物は機械的強度が比較的高いステンレス鋼からなる糸と機械的強度は劣るけれどもに熱伝導率の低いガラス繊維からなる糸を編んで形成するので、ステンレス鋼からなる糸が主として内管と外管との接触を防止し、ガラス繊維からなる糸が破壊されることを回避する。この結果、折曲げ時における断熱用筒状物の破壊は防止され、複層管の断熱性及び保温性が悪化することを防止することができる。   In the heat insulating multi-layer pipe of the present invention, the heat insulating cylinder is formed by knitting a thread made of stainless steel and a thread made of glass fiber, so that heat insulation interposed in a predetermined gap between the inner pipe and the outer pipe The cylinder is positioned between the inner tube and the outer tube to prevent contact between the inner tube and the outer tube during bending. Here, the tubular material for heat insulation is formed by knitting a yarn made of stainless steel having a relatively high mechanical strength and a yarn made of glass fiber having a low thermal conductivity although the mechanical strength is inferior. The yarn mainly prevents contact between the inner tube and the outer tube, and the yarn made of glass fiber is avoided from being broken. As a result, it is possible to prevent the heat insulating cylinder from being broken during bending, and to prevent deterioration of the heat insulating property and heat retaining property of the multilayer tube.

断熱用筒状物は、２〜２０本の糸を並列に引揃えた組み糸を平織状に編んで形成されたものであり、組み糸の内の１〜５本がステンレス鋼からなる糸であって残りがガラス繊維からなる糸であれば、内管又は外管に直接接触するステンレス鋼からなる糸の割合は減少する。また、断熱用筒状物はこの組み糸を平織状に編んで形成されるため、内管又は外管に直接接触したステンレス鋼からなる糸が互いに接触して内管と外管とを直接的に連結する部分は更に減少し、折曲げ時における断熱用筒状物の破壊を有効に防止しつつ、断熱性及び保温性を十分に確保する。
この場合、内管と外管との接触を主として防止する断熱用筒状物のステンレス鋼からなる糸の太さを２．４ｍｍ〜０．１ｍｍとすることにより、折曲げ時における内管と外管との間の所定の隙間を維持して断熱性及び保温性が悪化することを有効に防止するとともに、ステンレス鋼からなる１〜５本の糸を組み糸の中央に並べれば、この複層管を折曲げるときに単一のステンレス鋼からなる糸が受ける圧縮力を低減させることができ、それぞれのステンレス鋼からなる糸の機械的変形量を減少させて内管と外管との間の所定の隙間を確実に維持することができる。 The tubular body for heat insulation is formed by knitting a braided yarn in which 2 to 20 yarns are arranged in parallel into a plain weave, and 1 to 5 of the braided yarns are made of stainless steel. If the remainder is a yarn made of glass fiber, the proportion of the yarn made of stainless steel that directly contacts the inner tube or the outer tube decreases. In addition, since the tubular material for heat insulation is formed by knitting this braided yarn into a plain weave shape, the stainless steel yarns that are in direct contact with the inner tube or the outer tube come into contact with each other to directly connect the inner tube and the outer tube. Further, the number of the portions connected to the heat exchanger is further reduced, and the heat insulating property and the heat retaining property are sufficiently ensured while effectively preventing the breakage of the heat insulating cylinder during bending.
In this case, the thickness of the thread made of stainless steel, which is a tubular material for heat insulation that mainly prevents contact between the inner tube and the outer tube, is set to 2.4 mm to 0.1 mm, so that the inner tube and the outer tube at the time of bending are This multilayer is achieved by maintaining a predetermined gap between the pipes and effectively preventing deterioration of heat insulation and heat retention and arranging 1 to 5 threads made of stainless steel at the center of the braid. The compressive force applied to a single stainless steel thread when the pipe is bent can be reduced, and the amount of mechanical deformation of each stainless steel thread can be reduced to reduce the distance between the inner pipe and the outer pipe. The predetermined gap can be reliably maintained.

次に本発明を実施するための最良の形態を図面に基づいて説明する。
図１に示すように、本発明の断熱複層管１０は、金属製内管１１と、内管１１に所定の隙間ｄ（図３）をあけて嵌入された金属製外管１２と、内管１１と外管１２の間の所定の隙間ｄに介装された断熱用筒状物１３とを備える。内管１１はアルミニウムでメッキされた外径Ｄ1が２５ｍｍ〜１２０ｍｍの鋼管又はステンレス鋼管であって、その肉厚ｔ1は０．５ｍｍ〜４ｍｍのものが使用される。一方、外管１２はステンレス鋼からなり、その肉厚ｔ2は０．５ｍｍ〜４ｍｍのものが使用される。この金属であるステンレス鋼製の外管１２は内管１１と０．５ｍｍ〜５ｍｍの所定の隙間ｄをあけてその内管１１に嵌入される。そして、内管１１と外管１２の間の所定の隙間ｄに介装された断熱用筒状物１３は、ステンレス鋼からなる糸１４ａとガラス繊維からなる糸１４ｂを編んで形成される。なお、この明細書における「ステンレス鋼からなる糸」とは、ステンレス鋼をスウェージング加工により糸状にした形態のものをいい、「ガラス繊維からなる糸」とは、ガラス繊維のモノフィラメントを複数本撚り合わせた形態をいうものとする。 Next, the best mode for carrying out the present invention will be described with reference to the drawings.
As shown in FIG. 1, the heat insulating multilayer tube 10 of the present invention includes a metal inner tube 11, a metal outer tube 12 fitted in the inner tube 11 with a predetermined gap d (FIG. 3), And a heat insulating tubular member 13 interposed in a predetermined gap d between the tube 11 and the outer tube 12. The inner tube 11 is a steel tube or stainless steel tube plated with aluminum and having an outer diameter D 1 of 25 mm to 120 mm, and a wall thickness t 1 of 0.5 mm to 4 mm. On the other hand, the outer tube 12 made of stainless steel, its wall thickness t 2 are used those 0.5Mm～4mm. The outer tube 12 made of stainless steel, which is a metal, is fitted into the inner tube 11 with a predetermined gap d of 0.5 mm to 5 mm from the inner tube 11. The heat insulating tubular member 13 interposed in the predetermined gap d between the inner tube 11 and the outer tube 12 is formed by knitting a thread 14a made of stainless steel and a thread 14b made of glass fiber. In this specification, the term “yarn made of stainless steel” refers to a thread formed by swaging stainless steel, and “yarn made of glass fiber” refers to a plurality of glass fiber monofilaments twisted. It shall refer to the combined form.

断熱用筒状物１３は、２〜２０本の糸１４ａ，１４ｂを並列に引揃えた組み糸１４を平織状に編んで形成される。この実施の形態における組み糸１４は、図２に示すように、１０本の糸を並列に引揃えたものであって、その組み組み糸１４の内の２本がステンレス鋼からなる糸１４ａであって、残りの８本がガラス繊維からなる糸１４ｂであるものを示す。そして、ステンレス鋼からなる糸１４ａの太さａ1は２．４ｍｍ〜０．１ｍｍであってガラス繊維からなる糸１４ｂの太さａ2は２．４ｍｍ〜０．１ｍｍである。ここで、ガラス繊維からなる糸１４ｂの太さは、ステンレス鋼からなる糸１４ａの太さより小さなものであり、ステンレス鋼からなる糸の太さａ1に対するガラス繊維からなる糸の太さａ2の比（ａ2／ａ1）は０．５〜２である。そして、ステンレス鋼からなる２本の糸は組み糸１４の中央に並べられる。 The heat insulating tubular member 13 is formed by knitting a braided yarn 14 in which 2 to 20 yarns 14a and 14b are aligned in parallel into a plain weave. As shown in FIG. 2, the braided yarn 14 in this embodiment is formed by arranging ten yarns in parallel, and two of the braided yarns 14 are yarns 14a made of stainless steel. The remaining 8 are yarns 14b made of glass fiber. The thickness a 1 of the thread 14a made of stainless steel is 2.4 mm to 0.1 mm, and the thickness a 2 of the thread 14b made of glass fiber is 2.4 mm to 0.1 mm. Here, the thickness of the yarn 14b made of glass fibers is a small one than the thickness of the yarn 14a made of stainless steel, yarns made of glass fibers to the thickness a 1 of the yarn made of stainless steel thickness a 2 the ratio (a 2 / a 1) is from 0.5 to 2. Then, the two yarns made of stainless steel are arranged in the center of the braid 14.

このような鋼製の複層管１０では、内管１１の内部に砂や氷塊を詰め込んで或いは移動式芯金を挿入して内管１１の内径を潰すことなく図３に示すように折曲げると、その外側と内側の間の所定の隙間ｄを潰すように内管１１と外管１２が近づくけれども、内管１１と外管１２の間の所定の隙間ｄに介装された断熱用筒状物１３がその間に位置してその折曲げ時に内管１１と外管１２が接触することを回避する。ここで、断熱用筒状物１３は、機械的強度が比較的高いステンレス鋼からなる糸１４ａと機械的強度は劣るけれどもに熱伝導率の低いガラス繊維からなる糸１４ｂを編んで形成されており、内管１１の外径が２５ｍｍ〜１２０ｍｍであって所定の隙間ｄが０．５ｍｍ〜５ｍｍであるような比較的大きな複層管１０であっても、ステンレス鋼からなる糸１４ａが主として内管１１と外管１２との接触を防止し、ガラス繊維からなる糸１４ｂが破壊されることを回避する。この結果、折曲げ時における断熱用筒状物１３の破壊は防止され、複層管１０の断熱性及び保温性が悪化することが防止される。   In such a steel multi-layer pipe 10, sand or ice blocks are filled in the inner pipe 11 or a movable cored bar is inserted to bend as shown in FIG. 3 without crushing the inner diameter of the inner pipe 11. And the inner tube 11 and the outer tube 12 approach so as to crush a predetermined gap d between the outside and the inside, but the heat insulating cylinder interposed in the predetermined gap d between the inner tube 11 and the outer tube 12 It is avoided that the inner tube 11 and the outer tube 12 come into contact with each other when the shape 13 is positioned between them. Here, the heat insulating cylinder 13 is formed by knitting a yarn 14a made of stainless steel having a relatively high mechanical strength and a yarn 14b made of glass fiber having a low thermal conductivity although the mechanical strength is inferior. Even if the inner tube 11 has a relatively large multilayer tube 10 having an outer diameter of 25 mm to 120 mm and a predetermined gap d of 0.5 mm to 5 mm, the thread 14a made of stainless steel is mainly used as the inner tube. 11 and the outer tube 12 are prevented from contacting each other, and the yarn 14b made of glass fiber is prevented from being broken. As a result, destruction of the heat insulating tubular member 13 at the time of bending is prevented, and deterioration of the heat insulating property and heat retaining property of the multilayer tube 10 is prevented.

ここで、内管１１と外管１２との接触をステンレス鋼からなる糸１４ａが主として防止するので、ステンレス鋼からなる糸１４ａは内管１１と外管１２に接触することになる。しかし、断熱用筒状物１３は、２〜２０本の糸を並列に引揃えた組み糸１４を平織状に編んで形成され、組み糸１４の内の１〜５本が熱伝導率の高いステンレス鋼からなる糸１４ａであって残りは熱伝導率の低いガラス繊維からなる糸１４ｂである。このため、内管１１又は外管１２に直接接触してその断熱性及び保温性を悪化させるおそれがあるステンレス鋼からなる糸１４ａの割合は減少する。   Here, since the thread 14a made of stainless steel mainly prevents contact between the inner tube 11 and the outer tube 12, the thread 14a made of stainless steel comes into contact with the inner tube 11 and the outer tube 12. However, the tubular member 13 for heat insulation is formed by knitting a braided yarn 14 in which 2 to 20 yarns are arranged in parallel into a plain weave, and 1 to 5 of the braided yarns 14 have high thermal conductivity. A thread 14a made of stainless steel and the remainder is a thread 14b made of glass fiber having a low thermal conductivity. For this reason, the ratio of the thread | yarn 14a which consists of stainless steel which may be in direct contact with the inner tube | pipe 11 or the outer tube | pipe 12, and may worsen the heat insulation and heat retention reduces.

例えば図２に示すように、１０本の糸を並列に引揃えた組み糸１４を用い、その組み糸１４の内の２本がステンレス鋼からなる糸１４ａであって、残りの８本がガラス繊維からなる糸１４ｂである場合には、ステンレス鋼からなる糸１４ａの太さａ1がガラス繊維からなる糸１４ｂの太さａ2と同一であったとしても、そのステンレス鋼からなる糸１４ａが組み糸１４の全体に占める割合は１２．５％〜２０％にしかすぎない。また、断熱用筒状物１３はこの組み糸１４を平織状に編んで形成されるため、内管１１又は外管１２に直接接触したステンレス鋼からなる糸１４ａが互いに接触して内管１１と外管１２とを直接的に連結する部分は更に減少し、これらの２乗と考えても全体の１．５％〜４％になり、断熱性及び保温性を著しく悪化させるようなものではない。従って、本発明の複層管１０では、折曲げ時における断熱用筒状物１３の破壊を有効に防止しつつ、断熱性及び保温性を十分に確保することができる。 For example, as shown in FIG. 2, a braided yarn 14 in which ten yarns are arranged in parallel is used, two of the braided yarns 14 are yarns 14a made of stainless steel, and the remaining eight are glass. when a thread 14b made of fibers, even thickness a 1 yarn 14a made of stainless steel were identical to the thickness a 2 yarn 14b made of glass fibers, yarns 14a is made of the stainless steel The proportion of the entire braid 14 is only 12.5% to 20%. Further, since the tubular body 13 for heat insulation is formed by knitting the braided yarn 14 into a plain weave shape, the thread 14a made of stainless steel that is in direct contact with the inner tube 11 or the outer tube 12 comes into contact with the inner tube 11 and the inner tube 11. The portion directly connected to the outer tube 12 is further reduced, and even if these squares are considered, it becomes 1.5% to 4% of the whole, and the heat insulating property and the heat retaining property are not remarkably deteriorated. . Therefore, in the multilayer tube 10 of the present invention, it is possible to sufficiently ensure the heat insulating property and the heat retaining property while effectively preventing the destruction of the heat insulating tubular member 13 at the time of bending.

また、内管１１の外径Ｄ1が２５ｍｍ〜１２０ｍｍであるような比較的大径なものであっても、所定の隙間ｄを０．５ｍｍ〜５ｍｍとし、その内管１１と外管１２との接触を主として防止する断熱用筒状物１３のステンレス鋼からなる糸１４ａの太さを２．４ｍｍ〜０．１ｍｍとすれば、折曲げ時における内管１１と外管１２との間の所定の隙間を維持することができる。また、ガラス繊維からなる糸１４ｂの太さが２．４ｍｍ〜０．１ｍｍであって、ステンレス鋼からなる糸１４ａの太さより小さくなるように、ステンレス鋼からなる糸１４ａの太さに対するガラス繊維からなる糸１４ｂの太さの比ａ2／ａ1を０．５〜２とすれば、ステンレス鋼からなる糸１４ａの存在によりガラス繊維からなる糸１４ｂが破壊されることは確実に回避され、その断熱性及び保温性を有効に確保することができる。 Even if the outer diameter D 1 of the inner tube 11 is relatively large such as 25 mm to 120 mm, the predetermined gap d is set to 0.5 mm to 5 mm, and the inner tube 11 and the outer tube 12 If the thickness of the thread 14a made of stainless steel of the tubular member 13 for heat insulation that mainly prevents contact between the inner tube 11 and the outer tube 12 at the time of bending is set to 2.4 mm to 0.1 mm. Can be maintained. Further, the thickness of the yarn 14b made of glass fiber is 2.4 mm to 0.1 mm, and the glass fiber with respect to the thickness of the yarn 14a made of stainless steel is smaller than the thickness of the yarn 14a made of stainless steel. If the thickness ratio a 2 / a 1 of the yarn 14b is 0.5-2, it is reliably avoided that the yarn 14b made of glass fiber is broken due to the presence of the yarn 14a made of stainless steel. Heat insulation and heat retention can be effectively ensured.

更に、ステンレス鋼からなる１〜５本の糸１４ａ、この実施の形態では２本の糸１４ａが組み糸１４の中央に並べれば、複層管１０を折曲げるときに単一のステンレス鋼からなる糸１４ａが受ける圧縮力を低減させることができ、それぞれのステンレス鋼からなる糸１４ａの機械的変形量を減少させて内管１１と外管１２との間の所定の隙間を確実に維持し、その断熱性及び保温性を有効に確保することができる。   Furthermore, if 1 to 5 yarns 14a made of stainless steel, in this embodiment, two yarns 14a are arranged at the center of the braided yarn 14, they are made of a single stainless steel when the multilayer tube 10 is bent. The compression force received by the yarn 14a can be reduced, the amount of mechanical deformation of the yarn 14a made of each stainless steel is reduced, and a predetermined gap between the inner tube 11 and the outer tube 12 is reliably maintained, The heat insulation and heat retention can be effectively ensured.

本発明実施形態の断熱複層管の構造を示す斜視図である。It is a perspective view which shows the structure of the heat insulation multilayer tube of this invention embodiment. その断熱用筒状物を形成する組み糸の斜視図である。It is a perspective view of the braiding which forms the cylindrical object for heat insulation. その複層管の曲げられた状態を示す断面図である。It is sectional drawing which shows the bent state of the multilayer pipe.

符号の説明Explanation of symbols

１１ 内管
１２ 外管
１３ 断熱用筒状物
１４ 組み糸
１４ａ ステンレス鋼からなる糸
１４ｂ ガラス繊維からなる糸
ｄ 所定の隙間
Ｄ1 内管の外径 The outer diameter of the thread d predetermined gap D 1 inner tube made of yarns 14b glass fibers comprising 11 inner tube 12 outer tube 13 thermal insulation tubular object 14 set yarn 14a stainless steel

Claims (4)

金属製内管(11)と、前記内管(11)に所定の隙間をあけて嵌入された金属製外管(12)と、前記内管(11)と前記外管(12)の間の前記所定の隙間に介装された断熱用筒状物(13)とを備えた断熱複層管において、
前記断熱用筒状物(13)がステンレス鋼からなる糸(14a)とガラス繊維からなる糸(14b)を編んで形成されたことを特徴とする断熱複層管。 A metal inner pipe (11), a metal outer pipe (12) fitted with a predetermined gap in the inner pipe (11), and between the inner pipe (11) and the outer pipe (12) Insulating multi-layer pipe provided with a tubular material for heat insulation (13) interposed in the predetermined gap,
A heat insulating multi-layer pipe, wherein the heat insulating cylinder (13) is formed by knitting a thread (14a) made of stainless steel and a thread (14b) made of glass fiber. 断熱用筒状物(13)は、２〜２０本の糸(14a,14b)を並列に引揃えた組み糸(14)を平織状に編んで形成され、組み糸(14)の内の１〜５本がステンレス鋼からなる糸(14a)であって残りがガラス繊維からなる糸(14b)である請求項１記載の断熱複層管。   The tubular body for heat insulation (13) is formed by knitting a braided yarn (14) in which 2 to 20 yarns (14a, 14b) are arranged in parallel into a plain weave, and one of the braided yarns (14). The insulated multi-layer tube according to claim 1, wherein ~ 5 are yarns (14a) made of stainless steel and the remainder are yarns (14b) made of glass fiber. 内管(11)の外径が２５ｍｍ〜１２０ｍｍであって所定の隙間(d)が０．５ｍｍ〜５．０ｍｍであり、ステンレス鋼からなる糸(14a)の太さ(a1)が２．４ｍｍ〜０．１ｍｍであってガラス繊維からなる糸(14b)の太さ(a2)が２．４ｍｍ〜０．１ｍｍであり、かつ前記ステンレス鋼からなる糸(14a)の太さに対する前記ガラス繊維からなる糸(14b)の太さの比(a2/a1)が０．５〜２である請求項２記載の断熱複層管。 The outer diameter of the inner tube (11) is 25 mm to 120 mm, the predetermined gap (d) is 0.5 mm to 5.0 mm, and the thickness (a 1 ) of the thread (14a) made of stainless steel is 2. The thickness (a 2 ) of the yarn (14b) made of glass fiber of 4 mm to 0.1 mm is 2.4 mm to 0.1 mm, and the glass against the thickness of the yarn (14a) made of stainless steel insulation multilayer tube according to claim 2 wherein the ratio of the thickness of the yarn of fiber (14b) (a 2 / a 1) is 0.5 to 2. ステンレス鋼からなる１〜５本の糸(14a)が組み糸(14)の中央に並べられた請求項２又は３記載の断熱複層管。
The heat insulating multilayer pipe according to claim 2 or 3, wherein 1 to 5 threads (14a) made of stainless steel are arranged in the center of the braided thread (14).
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Cited By (2)

* Cited by examiner, † Cited by third party
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JP2010502911A (en) * 2006-08-29 2010-01-28 コノコフィリップス・カンパニー Dry fiber cladding tube
CN111503387A (en) * 2020-04-09 2020-08-07 海宁萃智智能机器人有限公司 Novel drinking water pipe, cold-hot bi-pass pipe and joint thereof

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010502911A (en) * 2006-08-29 2010-01-28 コノコフィリップス・カンパニー Dry fiber cladding tube
US8418337B2 (en) 2006-08-29 2013-04-16 Conocophillips Company Dry fiber wrapped pipe
CN111503387A (en) * 2020-04-09 2020-08-07 海宁萃智智能机器人有限公司 Novel drinking water pipe, cold-hot bi-pass pipe and joint thereof

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