JP2013053804A - Structure of triple pipe, and heat exchanger - Google Patents

Structure of triple pipe, and heat exchanger Download PDF

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JP2013053804A
JP2013053804A JP2011192168A JP2011192168A JP2013053804A JP 2013053804 A JP2013053804 A JP 2013053804A JP 2011192168 A JP2011192168 A JP 2011192168A JP 2011192168 A JP2011192168 A JP 2011192168A JP 2013053804 A JP2013053804 A JP 2013053804A
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tube
pipe
triple
medium
heat exchanger
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JP6032585B2 (en
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Akio Kurihara
明夫 栗原
Kishin Tachibana
紀伸 橘
Isao Katano
伊佐雄 片野
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NISHIYAMA SEISAKUSHO CO Ltd
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NISHIYAMA SEISAKUSHO CO Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide a structure of a triple pipe, and a heat exchanger capable of improving heat exchanger effectiveness and being miniaturized.SOLUTION: In the structure of the triple pipe and the heat exchanger of the embodiment, three pipes are fitted in a state of being overlapped to each other, and an outer pipe, an intermediate pipe and an inner pipe are successively overlapped from an outer side. The intermediate pipe is shaped into the waveform in which peak sections and trough sections are alternately disposed in the circumferential direction of the intermediate pipe, the peak sections are formed in a state of being kept into contact with the outer pipe, and the trough sections are formed in a state of being kept into contact with the inner pipe.

Description

本発明の実施形態は、三つの管が互いに重なるように嵌め合わせられ、当該重なる順番に外側から外管、中間管、及び、内管を有する三重管の構造及び熱交換器に関する。   Embodiments of the present invention relate to a triple-tube structure and a heat exchanger in which three tubes are fitted to overlap each other and have an outer tube, an intermediate tube, and an inner tube from the outside in the overlapping order.

例えば、浴槽の水を加熱するための熱交換器に三重管が用いられている。この三重管の内管と外管とは接続路によって互いに接続され、内管から入った浴槽の水が外管を通って再び浴槽に戻る（循環する）ようになっている。一方、中間管には温水が循環するようになっている。それにより、中間管内の温水の熱が内管及び外管に伝達され、浴槽の水が内管及び外管を通るときに加熱される。このようにして浴槽の水が循環することで、温度上昇するようになっている（例えば、特許文献１）。   For example, a triple pipe is used for a heat exchanger for heating water in a bathtub. The inner pipe and the outer pipe of the triple pipe are connected to each other by a connection path so that the water in the bathtub that has entered from the inner pipe returns (circulates) back to the bathtub through the outer pipe. On the other hand, warm water circulates in the intermediate pipe. Thereby, the heat of the warm water in the intermediate pipe is transmitted to the inner pipe and the outer pipe, and the water in the bathtub is heated when passing through the inner pipe and the outer pipe. As the water in the bathtub circulates in this manner, the temperature rises (for example, Patent Document 1).

一般に、三重管において、各管内の媒体相互の伝熱効果を向上させるためには各管が互いに重なり合う面積（伝熱面積）を広くする必要がある。伝熱面積を広くする一例として、重なり合う所を長くする方法がある。また、他の例として、三つの管の径を大きくする方法がある。   Generally, in a triple tube, in order to improve the heat transfer effect between the media in each tube, it is necessary to widen the area (heat transfer area) where the tubes overlap each other. As an example of increasing the heat transfer area, there is a method of lengthening the overlapping portion. As another example, there is a method of increasing the diameters of three tubes.

特開平６−２２９６１７号公報JP-A-6-229617

しかしながら、三つの管が重なり合う所を長くする方法、及び、三つの管の径を太くする方法では、三重管が大きくなり、その三重管を収容する熱交換器も大型になるという問題点がある。   However, in the method of lengthening the place where the three tubes overlap and the method of increasing the diameter of the three tubes, there is a problem that the triple tube becomes large and the heat exchanger that accommodates the triple tube becomes large. .

また、上記特許文献に記載された技術では、内管と外管とを接続するための接続路を設ける分だけ、三重管が大きくなるという問題点があった。   Moreover, in the technique described in the said patent document, there existed a problem that a triple pipe became large by the part which provided the connection path for connecting an inner pipe and an outer pipe.

この実施形態は、上記の問題を解決するものであり、媒体相互の伝熱効果を向上させる、小型にすることが可能な三重管の構造及び熱交換器を提供することを目的とする。   This embodiment solves the above-described problems, and an object thereof is to provide a triple-pipe structure and a heat exchanger that can improve the heat transfer effect between the media and can be reduced in size.

上記課題を解決するために、実施形態の三重管の構造は、三つの管が互いに重なるように嵌め合わせられ、当該重なる順番に外側から外管、中間管、及び、内管を有し、前記中間管は、中間管の周方向に山部と谷部とが交互に配された波形に形成され、前記山部は前記外管に接するように形成され、前記谷部は前記内管に接するように形成されることを特徴とする。   In order to solve the above-mentioned problem, the triple-pipe structure of the embodiment has three pipes fitted together so as to overlap each other, and has an outer pipe, an intermediate pipe, and an inner pipe from the outside in the overlapping order, The intermediate pipe is formed in a waveform in which crests and troughs are alternately arranged in the circumferential direction of the intermediate pipe, the crests are formed so as to contact the outer pipe, and the troughs are in contact with the inner pipe It is formed as follows.

中間管が波形に形成されるので、中間管が内管内及び外管内の媒体に接触する面積が広くなり、媒体相互の伝熱効果を向上させ、小型にすることが可能な三重管となる。また、中間管が波形に形成されるので、三重管の断面積、断面二次モーメントが大きくなり、弾性率、曲げ剛性及びねじり剛性を上げることが可能となる。   Since the intermediate tube is formed in a corrugated shape, the area in which the intermediate tube contacts the medium in the inner tube and the outer tube is widened, so that the heat transfer effect between the media is improved and the triple tube can be reduced in size. Further, since the intermediate tube is formed in a corrugated shape, the cross-sectional area and the secondary moment of the triple tube are increased, and the elastic modulus, bending rigidity and torsional rigidity can be increased.

第１の実施形態に係る三重管の正面図である。It is a front view of the triple pipe which concerns on 1st Embodiment. 三重管の部分拡大断面図である。It is a partial expanded sectional view of a triple pipe. 図１のＡ−Ａ線断面図である。It is the sectional view on the AA line of FIG. 第２の実施形態に係る三重管の断面図である。It is sectional drawing of the triple tube which concerns on 2nd Embodiment. 第２の実施形態の変形例に係る三重管の断面図である。It is sectional drawing of the triple tube which concerns on the modification of 2nd Embodiment.

［第１の実施形態］
この発明の第１の実施形態に係る三重管の構造について図１から図３を参照して説明する。ここで、三重管の構造とは、三以上の管が互いに重なるように嵌め合わされる構造において、重なり方向で隣接する三つの管を組み合わせる構造をいう。 [First Embodiment]
The structure of the triple tube according to the first embodiment of the present invention will be described with reference to FIGS. Here, the triple-pipe structure refers to a structure in which three or more pipes adjacent to each other in the overlapping direction are combined in a structure in which three or more pipes are fitted to each other.

図１は三重管の正面図である。図１に示すように、三つの管が互いに重なるように嵌め合わされた三重管の構造は、重なる順番に外側から外管１０、中間管２０及び内管３０を有している。三重管の構造は、浴槽の水を加熱するための熱交換器に用いられる他に、例えば、媒体によって熱交換が行われる給湯器及び空気調和器等の熱交換器に用いられる。   FIG. 1 is a front view of a triple tube. As shown in FIG. 1, the triple tube structure in which three tubes are fitted together so as to overlap each other has an outer tube 10, an intermediate tube 20, and an inner tube 30 from the outside in the overlapping order. The triple pipe structure is used for a heat exchanger such as a water heater and an air conditioner in which heat is exchanged by a medium, in addition to being used for a heat exchanger for heating water in a bathtub.

外管１０、中間管２０及び内管３０の中には、気体、液体及び固体のいずれかの媒体が入る。どのような媒体が入るかは熱交換器の用途による。また、管内の温度または圧力等により気体から液体に、反対に液体から気体に変わる媒体もある。   Any medium of gas, liquid, and solid enters the outer tube 10, the intermediate tube 20, and the inner tube 30. It depends on the application of the heat exchanger what kind of medium enters. There are also media that change from gas to liquid and vice versa, depending on the temperature or pressure in the tube.

熱交換においては、高温の媒体の熱を低温の媒体に移動させることにより、高温の媒体から熱が奪われて温度低下させ、低温の媒体を加熱して温度上昇させる。   In the heat exchange, the heat of the high-temperature medium is moved to the low-temperature medium, so that the heat is taken away from the high-temperature medium to lower the temperature, and the low-temperature medium is heated to raise the temperature.

次に、熱交換器に用いられる三重管の構造の一例について図１〜図３を参照して説明する。図２は三重管の部分拡大断面図である。図２に示すように、外管１０は中空軸であって、外管１０の両端部１１は縮径されて中間管２０の両端部２１に密着されている。外管１０の上流側の端部１１には連結管１２が設けられ、下流側の端部１１には連結管１３が設けられている。例えばＴ１［℃］の媒体（温水）Ａが連結管１２から外管１０内に流入し、連結管１３から流出する。   Next, an example of the structure of the triple tube used for the heat exchanger will be described with reference to FIGS. FIG. 2 is a partially enlarged sectional view of the triple tube. As shown in FIG. 2, the outer tube 10 is a hollow shaft, and both end portions 11 of the outer tube 10 are reduced in diameter and are in close contact with both end portions 21 of the intermediate tube 20. A connecting tube 12 is provided at the upstream end 11 of the outer tube 10, and a connecting tube 13 is provided at the downstream end 11. For example, T1 [° C.] medium (warm water) A flows into the outer tube 10 from the connecting tube 12 and flows out from the connecting tube 13.

中間管２０は中空であって、中間管２０の両端部２１は、縮径されて内管３０の両端部３１に密着されている。中間管２０の上流側の端部２１には連結管２２が設けられ、下流側の端部２１には連結管２３が設けられている。例えば、Ｔ２（＜Ｔ１）［℃］の媒体（水道水）Ｂが連結管２１から中間管２０内に流入し、連結管２３から流出する。   The intermediate tube 20 is hollow, and both end portions 21 of the intermediate tube 20 are reduced in diameter and are in close contact with both end portions 31 of the inner tube 30. A connecting pipe 22 is provided at the upstream end 21 of the intermediate pipe 20, and a connecting pipe 23 is provided at the downstream end 21. For example, a medium (tap water) B of T2 (<T1) [° C.] flows into the intermediate pipe 20 from the connecting pipe 21 and flows out from the connecting pipe 23.

図３は図１のＡ−Ａ線断面図である。図３に示すように、中間管２０は、中間管２０の周方向に波形に山部２５と谷部２６とを交互に配することにより波形に形成されている。山部２５及び谷部２６は同数であって、中間管２０の周方向に等間隔で２個以上設けられている。山部２５及び谷部の数は４から６個（この実施形態では５個）であることが好ましい。山部２５は中間管２０の周壁２７を外方に突出させることにより外管１０の周方向に等間隔に５カ所で接するように形成されている。谷部２６は中間管２０の周壁２７を内方に凹ませることにより内管３０の周方向に等間隔に５ヵ所で接するように形成されている。中間管２０の山部２５が外管１０に接しているため、外管１０内の媒体Ａは、隣接する山部２５の間の谷部２６を流れるようになる。   3 is a cross-sectional view taken along line AA of FIG. As shown in FIG. 3, the intermediate tube 20 is formed in a waveform by alternately arranging peaks 25 and valleys 26 in the waveform in the circumferential direction of the intermediate tube 20. The crests 25 and the troughs 26 are the same number, and two or more are provided at equal intervals in the circumferential direction of the intermediate tube 20. The number of peaks 25 and valleys is preferably 4 to 6 (5 in this embodiment). The ridges 25 are formed so as to be in contact with each other at five locations at equal intervals in the circumferential direction of the outer tube 10 by projecting the peripheral wall 27 of the intermediate tube 20 outward. The trough portions 26 are formed so as to be in contact at five locations at equal intervals in the circumferential direction of the inner tube 30 by denting the peripheral wall 27 of the intermediate tube 20 inward. Since the peak portion 25 of the intermediate tube 20 is in contact with the outer tube 10, the medium A in the outer tube 10 flows through the valley portion 26 between the adjacent peak portions 25.

山部２５が外管１０に接し、谷部２６が内管３０に接しているため、外管１０、中間管２０及び内管３０が単に嵌め合わされている三重管と比べてその剛性を上げることが可能となる。また、三重管の外から伝わる振動等、あるいは、三重管の内部で生じる振動等による異音の発生を防止することが可能となる。   Since the peak portion 25 is in contact with the outer tube 10 and the valley portion 26 is in contact with the inner tube 30, its rigidity is increased as compared with the triple tube in which the outer tube 10, the intermediate tube 20 and the inner tube 30 are simply fitted together. Is possible. Further, it is possible to prevent the generation of abnormal noise due to vibration transmitted from outside the triple tube or vibration generated inside the triple tube.

山部２５及び谷部２６の個数は２から１５であることが好ましい。ただし、個数が多いほど、熱交換時の伝熱効果を向上させ、曲げ剛性やねじり剛性を上げることが可能となる。なお、曲げ剛性やねじり剛性が上がる理由の説明は後述する。   The number of peaks 25 and valleys 26 is preferably 2 to 15. However, the larger the number, the higher the heat transfer effect during heat exchange, and the higher the bending rigidity and torsional rigidity. The reason why the bending rigidity and torsional rigidity are increased will be described later.

中間管２０は、中間管２０の軸２８回りにねじれるように形成されている。中間管２０を軸２８回りにねじることにより、山部２５及び谷部２６は螺旋状にカーブする。   The intermediate tube 20 is formed to be twisted around the axis 28 of the intermediate tube 20. By twisting the intermediate tube 20 around the axis 28, the crests 25 and the troughs 26 are spirally curved.

山部２５及び谷部２６が螺旋状にカーブすることにより、媒体Ｂの流れもカーブする。このとき、媒体Ｂはカーブの外側（谷部２６の外側）の領域に集まるように流れるため、カーブの内側（谷部２６の内側）の領域で媒体Ｂに乱流が発生しやすくなる。中間管２０のねじれる角度（ねじれ角）は、媒体の乱流が発生する角度から流れに支障を来す角度の範囲の間であればどのような角度であってもよい。中間管２０のねじれ角の一例としては、２度から４５度であることが好ましい。ここで、ねじれ角とは、山部２５の頂または谷部の底の螺旋と、その上の一点を通る軸２８に平行な直線とがなす角である。   Since the peak portion 25 and the valley portion 26 are spirally curved, the flow of the medium B is also curved. At this time, the medium B flows so as to gather in a region outside the curve (outside the valley portion 26), so that turbulence is likely to occur in the medium B in a region inside the curve (inside the valley portion 26). The twisting angle (twisting angle) of the intermediate tube 20 may be any angle as long as it is between the range in which the turbulent flow of the medium is generated and the angle that hinders the flow. An example of the twist angle of the intermediate tube 20 is preferably 2 to 45 degrees. Here, the twist angle is an angle formed by a spiral at the top of the peak portion 25 or the bottom of the valley portion and a straight line parallel to the axis 28 passing through a point on the top.

ここで、例えば、媒体ＡはＴ１［℃］の温水、媒体ＢはＴ２（＜Ｔ１）［℃］の水道水とすると、媒体Ａの熱が中間管２０に移動し、さらに、中間管２０の熱が媒体Ｂに移動する。このようにして、中間管２０と媒体Ｂとの熱交換が行われるが、媒体Ｂの流れが乱流なので、媒体内での熱移動が活発に行われるため、中間管２０の内側と媒体Ｂとの熱交換は活発に行われることとなり、媒体Ａの熱により特に中間管２０の内側を介して媒体Ｂを効果的に加熱することができ、伝熱効果を向上させることが可能となる。   For example, if the medium A is T1 [° C.] hot water and the medium B is T2 (<T1) [° C.] tap water, the heat of the medium A moves to the intermediate pipe 20, Heat is transferred to medium B. In this way, the heat exchange between the intermediate tube 20 and the medium B is performed. However, since the flow of the medium B is turbulent, heat transfer is actively performed in the medium. Therefore, the medium B can be effectively heated by the heat of the medium A, particularly through the inside of the intermediate tube 20, and the heat transfer effect can be improved.

次に、三重管の製造方法の一例を説明する。   Next, an example of a method for manufacturing a triple tube will be described.

三重管を構成する外管１０、中間管２０及び内管３０の材料として、例えば、銅、アルミニウム、黄銅、タングステン鋼、クロム鋼、マンガン鋼、炭素鋼のような熱伝導率の高い金属製の管が用いられる。   As a material of the outer tube 10, the intermediate tube 20, and the inner tube 30 constituting the triple tube, for example, a metal made of a metal having high thermal conductivity such as copper, aluminum, brass, tungsten steel, chromium steel, manganese steel, carbon steel, etc. A tube is used.

金属製の管の直径及び厚さは熱交換器の用途に応じて異なる。一例としては、外管１０には直径約２０［ｍｍ］、中間管２０には直径約３０［ｍｍ］、内管３０には直径約１０［ｍｍ］の金属製の管が用いられる。また、各金属製の管の厚さは、０．５［ｍｍ］から１．２［ｍｍ］が用いられる。   The diameter and thickness of the metal tube varies depending on the application of the heat exchanger. As an example, a metal tube having a diameter of about 20 [mm] is used for the outer tube 10, a diameter of about 30 [mm] is used for the intermediate tube 20, and a metal tube of about 10 [mm] is used for the inner tube 30. In addition, the thickness of each metal tube is 0.5 [mm] to 1.2 [mm].

各管の製造方法の一例として、金型（ダイス）で形成された先細の穴に金属管を通して引き抜くことにより、所定の断面形状に成形される引き抜き加工が用いられる。   As an example of a manufacturing method of each pipe, a drawing process is used in which a metal pipe is drawn through a tapered hole formed by a die (die) so as to have a predetermined cross-sectional shape.

以上に説明した三重管の構造は例えば熱交換器に用いられ、また、建築材料として用いられる。   The triple-pipe structure described above is used, for example, in a heat exchanger and as a building material.

次に、三重管の構造を熱交換器に用いたときの作用について説明する。   Next, the operation when the triple tube structure is used in a heat exchanger will be described.

熱交換器の用途によって、外管１０内の媒体Ａ、中間管２０内の媒体Ｂ及び内管３０内の媒体Ｃをどの程度の温度にするかが決められる。例えば、外管１０内に６０［℃］の媒体Ａを流すことで、中間管２０内の１５［℃］の媒体Ｂを４０［℃］に加熱して浴槽のお湯として利用し、内管３０内の１５［℃］の媒体Ｃを３０［℃］に加熱して台所の温水として利用することが可能となる。媒体Ａと媒体Ｂとは中間管２０の周壁２７を介して接触することで熱交換をし、媒体Ｂと媒体Ｃとは内管３０の周壁２７を介して接触することで熱交換をする。熱交換を効果的に行うためには、媒体と周壁２７との接触する面積を広くし、接触する時間を長くする必要がある。   The temperature of the medium A in the outer tube 10, the medium B in the intermediate tube 20, and the medium C in the inner tube 30 is determined depending on the use of the heat exchanger. For example, by flowing a medium A of 60 [° C.] through the outer pipe 10, the medium B of 15 [° C.] in the intermediate pipe 20 is heated to 40 [° C.] and used as hot water for the bath, and the inner pipe 30 Among them, the medium C of 15 [° C.] can be heated to 30 [° C.] and used as hot water in the kitchen. The medium A and the medium B exchange heat by contacting through the peripheral wall 27 of the intermediate tube 20, and the medium B and medium C exchange heat by contacting through the peripheral wall 27 of the inner tube 30. In order to effectively perform heat exchange, it is necessary to increase the contact area between the medium and the peripheral wall 27 and to increase the contact time.

外管１０の外径を大きくすることなく、周壁２７を長くするために、中間管２０に山部２５及び谷部２６を設ける。それによって、周壁２７が長くても山部２５及び谷部２６を設けることにより、流路を確保し、媒体と中間管２０とが接触する面積を広くすることができる。さらに山部２５を外管１０に当接させることで熱伝導により、熱が伝わり、媒体Ａと媒体Ｂとの熱交換を効果的に行うことが可能となる。また、谷部２６を内管３０に当接させることにより、熱が伝わりやすくなり、媒体Ｂと媒体Ｃとの熱交換を効果的に行うことが可能となる。   In order to lengthen the peripheral wall 27 without increasing the outer diameter of the outer tube 10, a peak portion 25 and a valley portion 26 are provided in the intermediate tube 20. Thereby, even if the peripheral wall 27 is long, by providing the peak portion 25 and the valley portion 26, the flow path can be secured and the area where the medium and the intermediate tube 20 contact can be widened. Furthermore, heat is transmitted by heat conduction by bringing the peak portion 25 into contact with the outer tube 10, and heat exchange between the medium A and the medium B can be performed effectively. Further, by bringing the valley portion 26 into contact with the inner tube 30, heat is easily transmitted, and heat exchange between the medium B and the medium C can be performed effectively.

さらに、山部２５及び谷部２６を螺旋状にカーブするように形成することにより、中間管の内・外で媒体の流れに乱流を発生させやすくする。媒体の乱流によって、中間管の内・外側で媒体の熱移動が活発に行われることとなり、媒体Ａと媒体Ｂとの熱交換を効果的に行うことが可能となる。   Furthermore, by forming the peak portions 25 and the valley portions 26 so as to be spirally curved, it is easy to generate turbulent flow in the medium flow inside and outside the intermediate tube. Due to the turbulent flow of the medium, the heat transfer of the medium is actively performed inside and outside the intermediate tube, and the heat exchange between the medium A and the medium B can be effectively performed.

また、熱交換器の用途に応じて、媒体Ａ、Ｂ、Ｃの流れる方向をどのようにするかが決められる。すなわち、媒体Ａ、Ｂ、Ｃの流れる方向を共に同じにする場合、媒体Ａ、Ｂ、Ｃのうちのいずれか一つの媒体の流れと他の二つの媒体との流れる方向を逆にする場合とがある。   In addition, depending on the application of the heat exchanger, it is determined how to flow the media A, B, and C. That is, when the flow directions of the media A, B, and C are all the same, the flow direction of any one of the media A, B, and C and the flow direction of the other two media are reversed. There is.

図２に媒体の流れを矢印で示すように、媒体同士の流れる方向を逆にした場合、区間において、区間の始点と終点とで媒体同士の温度差が大きくなるため、熱交換の量は大きくなる。また、媒体同士の温度を逆転（媒体Ａの温度Ｔ１と媒体Ｂの温度Ｔ２（＜Ｔ１）が出口において逆転、Ｔ１＜Ｔ２）させることができる。   As shown by arrows in FIG. 2, when the flow direction of the media is reversed, the temperature difference between the media at the start point and the end point of the interval increases in the interval, so the amount of heat exchange is large. Become. Further, the temperatures of the media can be reversed (the temperature T1 of the medium A and the temperature T2 (<T1) of the medium B are reversed at the outlet, T1 <T2).

媒体同士の流れる方向を同じにした場合、平行して流れる区間において、区間の始点から終点にかけて熱交換の量は少なくなっていき、終点において媒体同士の温度差は小さくなる。   When the flow directions of the media are the same, in the section flowing in parallel, the amount of heat exchange decreases from the start point to the end point of the section, and the temperature difference between the media decreases at the end point.

次に、三重管の構造を建築材料として用いたときについて説明する。   Next, the case where the triple tube structure is used as a building material will be described.

三重管の断面二次モーメントは、三つの管を単に嵌め合わせたときと比べて、中間管２０に山部２５及び谷部２６を設けることにより増加するため、曲げ剛性、ねじり剛性を上げることが可能となる。   The cross-sectional second moment of the triple pipe is increased by providing the peak part 25 and the valley part 26 in the intermediate pipe 20 as compared with the case where the three pipes are simply fitted together, so that the bending rigidity and the torsional rigidity can be increased. It becomes possible.

また、山部２５を外管１０に当接させ、谷部２６を内管３０に当接させることにより、三重管に対して中間管２０の軸２８の方向に外力を作用させたとき、当接させた部分に摩擦力が発生するため、その外力に十分な力で対抗することが可能となる。   In addition, when an external force is applied to the triple pipe in the direction of the axis 28 of the intermediate pipe 20 by bringing the peak 25 into contact with the outer pipe 10 and the valley 26 in contact with the inner pipe 30, Since a frictional force is generated at the contacted portion, it is possible to counteract the external force with a sufficient force.

さらに、複数の山部２５を外管１０に等間隔で当接させ、複数谷部２６を内管３０に等間隔で当接させることにより、圧縮力を三重管に対して中間管２０の軸２８と直交する方向に作用させたときにも、十分な力で対抗することが可能となる。   Further, the plurality of peak portions 25 are brought into contact with the outer tube 10 at equal intervals, and the plurality of valley portions 26 are brought into contact with the inner tube 30 at equal intervals, thereby compressing the compressive force with respect to the triple tube. Even when acting in a direction perpendicular to 28, it is possible to counteract with a sufficient force.

また、三重管の断面積は、中間管２０に山部２５及び谷部２６を設けることにより増加するため、弾性率を上げることが可能となる。それにより、軸２８方向の大きな圧縮力や引っ張り力に対して十分に対抗することが可能な三重管となる。   Moreover, since the cross-sectional area of the triple pipe is increased by providing the peak part 25 and the valley part 26 in the intermediate pipe 20, the elastic modulus can be increased. Thereby, a triple tube capable of sufficiently resisting a large compressive force or tensile force in the direction of the shaft 28 is obtained.

［第２の実施形態］
次に、この発明の第２の実施形態に係る三重管の構造ついて図４を参照して説明する。 [Second Embodiment]
Next, a triple tube structure according to a second embodiment of the present invention will be described with reference to FIG.

なお、第２の実施形態において、第１の実施形態と同じ構成のものは同一番号を付し、その説明を省略する。   In the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

図４は三重管の断面図である。図４に示すように、内管３０は、中間管２０の隣接する谷部２６の間に進入するように形成される凸部３５を有している。凸部３５は、谷部２６（山部２５とも）と同数であって、内管３０の周方向に等間隔で２個以上設けられている。凸部３５は、４から６個であることが好ましい。なお、凸部３５は、山部２５および谷部２６の個数と同数であり、この実施形態では５個である。   FIG. 4 is a cross-sectional view of the triple tube. As shown in FIG. 4, the inner tube 30 has a convex portion 35 formed so as to enter between adjacent valley portions 26 of the intermediate tube 20. The number of the convex portions 35 is the same as that of the valley portions 26 (also called the mountain portions 25), and two or more convex portions 35 are provided at equal intervals in the circumferential direction of the inner tube 30. The number of the convex portions 35 is preferably 4 to 6. Note that the number of convex portions 35 is the same as the number of peak portions 25 and trough portions 26, and in this embodiment, five.

凸部３５が谷部２６の間に進入する量Ｓは、谷部２６の深さの１／１０〜１／１の長さである。   The amount S that the convex portion 35 enters between the valley portions 26 is 1/10 to 1/1 of the depth of the valley portion 26.

内管３０に凸部３５を設けることにより、内管３０の周壁３７が長くなって、媒体Ｂ、Ｃ同士が内管３０の壁部を介して接する面積を広くすることができる。それにより、媒体Ｂ、Ｃ同士の熱交換を効率的に行うことが可能となる。   By providing the convex portion 35 on the inner tube 30, the peripheral wall 37 of the inner tube 30 becomes longer, and the area where the media B and C are in contact with each other through the wall portion of the inner tube 30 can be increased. Thereby, heat exchange between the media B and C can be performed efficiently.

次に、三重管の変形例について図５を参照して説明する。   Next, a modification of the triple tube will be described with reference to FIG.

図５は、変形例に係る三重管をその軸と直交する方向に破断した横断面図である。図５に示すように、内管３０は、内管３０の軸３８回りにねじれるように形成されている。さらに、中間管２０と内管３０とは、相互に逆方向にねじれている。例えば、図５において中間管２０が時計回りにねじれているのに対し、内管２０が反時計回りにねじれている。内管３０のねじれ角は、流れの中に乱流が発生する角度から流れに支障を来す角度の範囲（たとえば、２度から４５度）であることが好ましい。ここで、ねじれ角とは、中間管２０のねじれ角と同様に、凸部３５の頂の螺旋と、その上の一点を通る軸３８に平行な直線とがなす角である。   FIG. 5 is a cross-sectional view in which the triple tube according to the modification is broken in a direction perpendicular to the axis. As shown in FIG. 5, the inner tube 30 is formed to be twisted around the axis 38 of the inner tube 30. Further, the intermediate tube 20 and the inner tube 30 are twisted in opposite directions. For example, in FIG. 5, the intermediate tube 20 is twisted clockwise while the inner tube 20 is twisted counterclockwise. The twist angle of the inner tube 30 is preferably in the range of an angle that hinders the flow from the angle at which turbulent flow occurs in the flow (for example, 2 to 45 degrees). Here, like the torsion angle of the intermediate tube 20, the torsion angle is an angle formed by a spiral at the top of the convex portion 35 and a straight line parallel to the axis 38 passing through one point thereon.

隣接する凸部３５同士の間には、内管３０の軸３８側に凹入する凹部３６が形成されている。   A recess 36 that is recessed toward the shaft 38 of the inner tube 30 is formed between the adjacent protrusions 35.

内管３０をねじるように形成したことにより、凸部３５及び凹部３６は螺旋状にカーブするように形成される。それにより、中間管２０内での内管に接する面での流れに乱流を発生させやすくする。それにより、媒体Ｂ内での熱移動が活発に行われることになり、媒体Ｂ、Ｃ同士の熱交換が活発に行われることとなり、媒体Ｂ、Ｃ同士の伝熱効果を向上させることが可能となる。   By forming the inner tube 30 to be twisted, the convex portion 35 and the concave portion 36 are formed to be curved in a spiral shape. Thereby, it becomes easy to generate turbulent flow in the flow on the surface in contact with the inner tube in the intermediate tube 20. As a result, heat transfer in the medium B is actively performed, heat exchange between the media B and C is actively performed, and the heat transfer effect between the media B and C can be improved. It becomes.

また、内管３０内の媒体Ｃは、凸部３５に沿って流れて、カーブの外側に集まり、管内側で乱流が発生しやすくなる。媒体Ｃの乱流によって、媒体Ｃの熱移動が活発に行われることとなり、媒体Ｂ、Ｃ同士の伝熱効果を向上させることが可能となる。   Further, the medium C in the inner tube 30 flows along the convex portion 35 and gathers outside the curve, so that turbulent flow is likely to occur inside the tube. The heat transfer of the medium C is actively performed by the turbulent flow of the medium C, and the heat transfer effect between the mediums B and C can be improved.

なお、上記実施形態では、外管１０、中間管２０及び内管３０に異なる媒体Ａ、Ｂ、Ｃをそれぞれ流したが、熱交換器の用途に応じて、媒体Ａ、Ｂ、Ｃのいずれか二つをおなじ媒体としてもよい。例えば、外管１０及び内管３０を直接的にまたは間接的に連結して、同じ媒体を流すようにしてもよい。また、媒体Ａ、Ｂ、Ｃを液体としたが、気体や固体であってもよい。   In the above embodiment, different media A, B, and C are allowed to flow through the outer tube 10, the intermediate tube 20, and the inner tube 30, respectively. However, any one of the media A, B, and C is used depending on the application of the heat exchanger. The two may be the same medium. For example, the same medium may flow by connecting the outer tube 10 and the inner tube 30 directly or indirectly. Further, although the media A, B, and C are liquids, they may be gases or solids.

以上説明した実施形態は、一例として提示したものであり、発明の範囲を限定することを意図していない。これら新規な実施形態は、その他の様々な形態で実施されることが可能であり、発明の要旨を逸脱しない範囲で、種々の省略、書き換え、変更を行うことができる。これら実施形態やその変形は、発明の範囲や要旨に含まれるとともに、特許請求の範囲に記載された発明とその均等の範囲に含まれる。   The embodiment described above is presented as an example, and is not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, rewrites, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

１０ 外管 １１ 端部 １２ 連結管 １３ 連結管
２０ 中間管 ２１ 端部 ２２ 連結管 ２３ 連結管
２５ 山部 ２６ 谷部 ２７ 周壁 ２８ 軸
３０ 内管 ３１ 端部 ３５ 凸部 ３６ 凹部 ３７ 周壁 ３８ 軸 DESCRIPTION OF SYMBOLS 10 Outer pipe 11 End part 12 Connection pipe 13 Connection pipe 20 Intermediate pipe 21 End part 22 Connection pipe 23 Connection pipe 25 Mountain part 26 Valley part 27 Peripheral wall 28 Axis 30 Inner pipe 31 End part 35 Convex part 36 Concave part 37 Peripheral wall 38 Axis

Claims (7)

三つの管が互いに重なるように嵌め合わせられ、当該重なる順番に外側から外管、中間管、及び、内管を有する三重管の構造において、
前記中間管は、当該中間管の周方向に山部と谷部とが交互に配された波形に形成され、
前記山部は前記外管に接するように形成され、
前記谷部は前記内管に接するように形成されることを特徴とする三重管の構造。 In a triple tube structure in which three tubes are fitted to overlap each other and have an outer tube, an intermediate tube, and an inner tube from the outside in the overlapping order,
The intermediate pipe is formed in a waveform in which peaks and valleys are alternately arranged in the circumferential direction of the intermediate pipe,
The peak is formed so as to contact the outer tube,
The triple tube structure is characterized in that the valley portion is formed in contact with the inner tube. 前記中間管は、当該中間管の軸回りにねじれるように形成されていることを特徴とする請求項１に記載の三重管の構造。   The triple pipe structure according to claim 1, wherein the intermediate pipe is formed to be twisted around an axis of the intermediate pipe. 前記内管は、隣接する前記谷部の間に進入するように形成される凸部を有することを特徴とする請求項２に記載の三重管の構造。   The triple pipe structure according to claim 2, wherein the inner pipe has a convex portion formed so as to enter between the adjacent valley portions. 前記内管は、当該内管の軸回りにねじれるように形成されていることを特徴とする請求項３に記載の三重管の構造。   The triple pipe structure according to claim 3, wherein the inner pipe is formed so as to be twisted around an axis of the inner pipe. 前記内管は、前記中間管に対し逆方向にねじれていることを特徴とする請求項４に記載の装置。   The apparatus according to claim 4, wherein the inner tube is twisted in the opposite direction with respect to the intermediate tube. 前記山部及び前記谷部並びに前記凸部は同数であって、中間管の周方向に等間隔に２個以上設けられていることを特徴とする請求項３に記載の装置。   4. The apparatus according to claim 3, wherein the number of the crests, the troughs, and the protrusions is the same, and two or more are provided at equal intervals in the circumferential direction of the intermediate tube. 請求項１から請求項６のいずれか一つに記載の三重管の構造と、前記外管、前記中間管及び前記内管にそれぞれ接続する流路とを有する熱交換器。   The heat exchanger which has the structure of the triple tube as described in any one of Claims 1-6, and the flow path respectively connected to the said outer tube, the said intermediate tube, and the said inner tube.
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