JPH0227349Y2

JPH0227349Y2 -

Info

Publication number: JPH0227349Y2
Application number: JP16091985U
Authority: JP
Priority date: 1985-10-21
Filing date: 1985-10-21
Publication date: 1990-07-24
Also published as: JPS6270270U

Description

【考案の詳細な説明】〔産業上利用分野〕本考案は二重管の端部構造に関する。[Detailed explanation of the idea] [Industrial application field] The present invention relates to a double pipe end structure.

[Prior art and its problems]

熱交換器等の二重管は、外管の内壁との間に空
間を設けて該外管内に内管を配置し、該外管の開
口端を継手等を用いて液密に封止している。 For double tubes such as heat exchangers, the inner tube is placed inside the outer tube with a space between it and the inner wall of the outer tube, and the open end of the outer tube is sealed liquid-tight using a fitting, etc. ing.

その際、内管と外管とが、同種、同系統の金属
で構成される二重管については継手と内管及び外
管とは溶接によつて接続する事が可能である。 In this case, in the case of a double pipe in which the inner pipe and the outer pipe are made of the same kind of metal and the same type of metal, the joint and the inner pipe and the outer pipe can be connected by welding.

しかし、溶接の出来ない異種金属の組み合せ、
たとえば、Cu又はCu合金とTi、AlとTi、Cu又
はCu合金とAl等の組合せの二重管の場合、接続
は溶接が不可又は溶接の信頼性がなく、長期間使
用の際の接続部よりのリークが生じ、信頼性につ
いての問題があり継手製作及び取付けも煩雑であ
る。 However, the combination of dissimilar metals that cannot be welded,
For example, in the case of double pipes made of combinations of Cu or Cu alloy and Ti, Al and Ti, Cu or Cu alloy and Al, etc., the connections cannot be welded or the welding is unreliable, and the connections during long-term use This causes leakage, reliability problems, and joint manufacturing and installation are complicated.

[Means of problem solving]

上記問題点は、外管とは相互に溶接不能又は困
難な金属又は合金からなる内管を、外管の内壁と
の間に空間を設けて該外管内に配置し、該外管の
開口端を継手を介して液密に封止してなる二重管
の端部構造において、該内管の外径と略同一の内
径を有する中空芯材と、該中空芯材の外面に接合
され、該外管の内径と略同一の外径を有する外皮
との複合構造を有し、該外皮が該外管と溶接可能
な金属又は合金からなり、該中空芯材が該内管と
溶接可能な金属又は合金からなる中空継手を、該
外管の端部において該外管と該内管との中にはめ
込め、該外管と該外皮とを、又、該中空芯材と該
内管とをそれぞれ溶接することにより該外管の開
口端の液密封止と該内管と該外管との接合を行な
うことにより解決される。 The above problem is solved by placing an inner tube made of a metal or alloy that cannot or is difficult to weld with the outer tube inside the outer tube with a space between the inner wall of the outer tube and the open end of the outer tube. In the end structure of a double pipe, which is liquid-tightly sealed via a joint, a hollow core member having an inner diameter substantially the same as the outer diameter of the inner pipe, and a hollow core member joined to the outer surface of the hollow core member, It has a composite structure with an outer skin having an outer diameter that is approximately the same as the inner diameter of the outer pipe, the outer skin is made of a metal or alloy that can be welded to the outer pipe, and the hollow core material is weldable to the inner pipe. A hollow joint made of metal or an alloy is fitted into the outer tube and the inner tube at the end of the outer tube, and the outer tube and the outer skin and the hollow core and the inner tube are connected. This problem can be solved by welding each other to liquid-tightly seal the open end of the outer tube and join the inner tube and the outer tube.

[Example of idea]

以下に本考案の実施例を図面に基づいて説明す
る。 Embodiments of the present invention will be described below based on the drawings.

本例では、外管１がCuよりなり、内管３がTi
よりなる二重管６から成る熱交換器の例を示す。 In this example, the outer tube 1 is made of Cu, and the inner tube 3 is made of Ti.
An example of a heat exchanger made of double pipes 6 is shown.

本例の外管１の端部には、フレオンガスを導入
するための開口を有するテイーズ２が溶接接合さ
れており、このテイーズ２が外管の一部を構成し
ている。このテイーズ２はCuからなる。 A Tees 2 having an opening for introducing Freon gas is welded to an end of the outer tube 1 in this example, and the Tees 2 constitute a part of the outer tube. This Tees 2 is made of Cu.

この外管内に、内管３を、外管１の内壁との間
に空間を設けて配置し、外管１の開口端となるテ
イーズ２を中空継手７を介して液密に封止してあ
る。 The inner tube 3 is arranged within this outer tube with a space provided between it and the inner wall of the outer tube 1, and the teeth 2, which are the open ends of the outer tube 1, are sealed liquid-tightly via the hollow joint 7. be.

この中空継手は複合構造をしており、次のよう
に作成した。 This hollow joint has a composite structure and was created as follows.

１外径143φで厚み7tのCu管の中にTiのビレツ
トを装入し熱間静水圧押出しにて29φの丸棒を
押出す。1. A Ti billet is placed in a Cu tube with an outer diameter of 143φ and a thickness of 7t, and a round bar of 29φ is extruded using hot isostatic extrusion.

２冷間加工で20.25φまで抽伸し継手の寸法に加
工し、更に機械加工によつて継手に加工する。2. Draw to 20.25φ by cold working to the dimensions of the joint, and then process it into the joint by machining.

中空芯材７は、内管３の外径と略同一の内径を
有し、外皮４は、外管１のテイーズ２の内径と略
同一の外径を有する。 The hollow core material 7 has an inner diameter that is substantially the same as the outer diameter of the inner tube 3, and the outer skin 4 has an outer diameter that is substantially the same as the inner diameter of the teeth 2 of the outer tube 1.

この中空継手７を、テイーズ２と内管３との中
にはめ込めこみ、外皮４とテイズ２とを溶接する
とともに、芯材５と内管３とを溶接する。これに
より、外管１の開口端の液密封止と内管３と外管
１との接合を行なう。 This hollow joint 7 is fitted into the teeth 2 and the inner tube 3, and the outer skin 4 and the teeth 2 are welded together, and the core material 5 and the inner tube 3 are welded together. Thereby, the open end of the outer tube 1 is liquid-tightly sealed and the inner tube 3 and the outer tube 1 are joined together.

なお、外皮材４と芯材５の界面の接合強度を上
げるため本例では、静水圧押出しを行なつたが、
その他の手段、たとえば、爆着等により接合して
もよい。特に静水圧押出し、爆着によれば冷間で
の合せ抽伸等の場合に問題となる界面のシール性
の不安定さが解決される。 Note that in this example, hydrostatic extrusion was performed to increase the bonding strength at the interface between the outer skin material 4 and the core material 5.
They may be joined by other means, such as explosive bonding. In particular, hydrostatic extrusion and explosive bonding solve the problem of unstable sealing at the interface, which is a problem in cases of cold combined drawing, etc.

また、本例では、CuとTiとの例を示したが、
その他に、たとえば、次の組合せをの場合でもよ
いことは当然である。 In addition, in this example, an example of Cu and Ti was shown, but
It goes without saying that the following combinations may also be used, for example.

Cu、Cu合金とTi、Ti合金 Cu、Cu合金とAl、Al合金 Al、Al合金とTi、Ti合金さらに、熱交換器のみならず他の二重管の場合
にも有効である。 Cu, Cu alloy and Ti, Ti alloy Cu, Cu alloy and Al, Al alloy Al, Al alloy and Ti, Ti alloy Furthermore, it is effective not only for heat exchangers but also for other double pipes.

[Effect of idea]

通常、同一、及び同系統の金属同志しか溶接出
来ない二重管の管端処理が異種の金属の組み合せ
によつても管端処理が可能となつた。 Normally, only metals of the same or similar type can be welded to each other, but now it is now possible to weld ends of double pipes by combining dissimilar metals.

[Brief explanation of drawings]

図面は本考案の実施例を示す断面図である。１……外管、２……テイーズ、３……内管、４
……外皮、５……芯材、６……二重管、７……中
空継手。 The drawing is a sectional view showing an embodiment of the present invention. 1... Outer tube, 2... Tease, 3... Inner tube, 4
... Outer skin, 5 ... Core material, 6 ... Double pipe, 7 ... Hollow joint.

Claims

[Scope of utility model registration request]

An inner tube made of a metal or alloy that cannot be or is difficult to weld to the outer tube is placed inside the outer tube with a space between it and the inner wall of the outer tube, and the open end of the outer tube is connected via a joint. In the end structure of a double pipe sealed liquid-tightly, there is a hollow core member having an inner diameter substantially the same as the outer diameter of the inner pipe, and a hollow core member that is joined to the outer surface of the hollow core member and has an inner diameter of the outer pipe. has a composite structure with an outer skin having approximately the same outer diameter as the inner pipe, the outer skin is made of a metal or alloy that can be welded to the outer pipe, and the hollow core material is made of a metal or alloy that can be welded to the inner pipe. By fitting a hollow joint into the outer tube and the inner tube at the ends of the outer tube, and welding the outer tube and the outer skin, and the hollow core material and the inner tube, respectively. A double tube end structure characterized in that the open end of the outer tube is liquid-tightly sealed and the inner tube and the outer tube are joined.