JP2012007767A - Double tube for heat exchanger - Google Patents

Double tube for heat exchanger Download PDF

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JP2012007767A
JP2012007767A JP2010142240A JP2010142240A JP2012007767A JP 2012007767 A JP2012007767 A JP 2012007767A JP 2010142240 A JP2010142240 A JP 2010142240A JP 2010142240 A JP2010142240 A JP 2010142240A JP 2012007767 A JP2012007767 A JP 2012007767A
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tube
inner tube
double
pipe
outer tube
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Shinichi Matsuda
眞一 松田
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Sumitomo Light Metal Industries Ltd
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Sumitomo Light Metal Industries Ltd
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Priority to JP2010142240A priority Critical patent/JP2012007767A/en
Priority to PCT/JP2011/063870 priority patent/WO2011162170A1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/10—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged one within the other, e.g. concentrically
    • F28D7/106—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged one within the other, e.g. concentrically consisting of two coaxial conduits or modules of two coaxial conduits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/02—Tubular elements of cross-section which is non-circular
    • F28F1/06—Tubular elements of cross-section which is non-circular crimped or corrugated in cross-section

Abstract

PROBLEM TO BE SOLVED: To provide a double tube for a heat exchanger, wherein the double tube can be used without generating noise during operation and has a structure exhibiting excellent heat exchange performance.SOLUTION: The double tube 1 for a heat exchanger has a double tube configuration having an inner tube 2 disposed within an outer tube 10, and is used for heat exchange between a fluid flowing inside the inner tube 2 and a fluid flowing between the inner tube 2 and the outer tube 10. The inner tube 2 has a shape, in which the apex parts 21 of a triangle are formed as circular arc curved surfaces in a cross-sectional shape and the positions of the apex parts 21 are helically displaced in the longitudinal direction. The the outer tube 10 has a shape of a smooth tube, in which a cross-sectional shape has a circular shape. The inner peripheral surface of the outer tube 10 and the apex parts 21 of the inner tube 2 are in contact with each other, and outer flow paths 31 which are divided in three segments in the circumferential direction are formed between the outer tube 10 and the inner tube 2. The inner tube 2 and the outer tube 10 preferably consist of an aluminum alloy or a copper alloy.

Description

本発明は、例えば自動車用空調装置などの熱交換サイクルに適用可能な熱交換器用二重管に関する。   The present invention relates to a double tube for a heat exchanger that can be applied to a heat exchange cycle such as an air conditioner for an automobile.

自動車用空調装置などの熱交換サイクル（冷凍サイクルともいう）は、凝縮器、蒸発器、圧縮機及び膨張弁を備え、これらを連結する循環経路に、フロン、ＣＯ2、アンモニアなどの冷媒を循環させるシステムである。かかる熱交換サイクルにおいて、循環経路中に二重管を配置し、当該二重管によって構成される二層の空間に、凝縮器から出てくる高温冷媒と、蒸発器から出てくる低温冷媒とを対向して流して熱交換することにより、熱交換性能を向上させることが提案されている（特許文献１、２参照）。 A heat exchange cycle (also referred to as a refrigeration cycle) such as an air conditioner for automobiles includes a condenser, an evaporator, a compressor, and an expansion valve, and a refrigerant such as CFC, CO 2 , and ammonia is circulated in a circulation path connecting them. It is a system to let you. In such a heat exchange cycle, a double pipe is disposed in the circulation path, and a high-temperature refrigerant coming out of the condenser and a low-temperature refrigerant coming out of the evaporator are disposed in a two-layer space constituted by the double pipe. It has been proposed that the heat exchange performance is improved by flowing the gas in the opposite direction to exchange heat (see Patent Documents 1 and 2).

一方、熱交換サイクルにおいて使用される冷媒としては、環境問題に対応するために、より地球温暖化係数の低い冷媒が検討されている。これらの環境問題を考慮した冷媒は、現行の冷媒に比べ熱交換性能が低下することが懸念されている。このため、熱交換サイクル全体の性能劣化を抑制するためには、装置構成として、上記の二重管を組み込むことにより熱交換性能をより向上させた構成を積極的に採用することが有効である。   On the other hand, as a refrigerant used in the heat exchange cycle, a refrigerant having a lower global warming potential has been studied in order to cope with environmental problems. There is a concern that the refrigerant considering these environmental problems has lower heat exchange performance than the current refrigerant. For this reason, in order to suppress the performance deterioration of the entire heat exchange cycle, it is effective to positively adopt a configuration in which the heat exchange performance is further improved by incorporating the above-described double pipe as the device configuration. .

蒸発器から排出された気体冷媒を圧縮機で圧縮するシステムの場合には、冷媒が十分に気化しきれない状態（液体が混入している状態）で圧縮機に流入すると熱交換できないという不具合を、上記二重管を組み込むことによって解消することができる。つまり、上記二重管において、圧縮機に流入させる前の冷媒を加熱することができ、冷媒を十分に気化させることができる。
これまで提案された二重管としては、その内管として、熱交換性能を向上させるためにねじり管がよく用いられる（特許文献１、２参照）。 In the case of a system that compresses the gaseous refrigerant discharged from the evaporator with a compressor, the problem is that heat cannot be exchanged if the refrigerant flows into the compressor in a state where the refrigerant cannot be sufficiently vaporized (liquid is mixed). The problem can be solved by incorporating the double pipe. That is, in the double pipe, the refrigerant before flowing into the compressor can be heated, and the refrigerant can be sufficiently vaporized.
As the double pipes proposed so far, torsion pipes are often used as the inner pipes in order to improve heat exchange performance (see Patent Documents 1 and 2).

特開２００２−３１８０１５号公報Japanese Patent Laid-Open No. 2002-318015 特開２００６−１６２２４１号公報JP 2006-162241 A

特許文献２は、らせん状に溝部を形成した内管と平滑外管を組み合わせたものであって、内管の外径よりも外管の内径を大きくしたものである。しかしながら、この構造では、少なくとも二重管の直線部分では内管と外管が接していないか１箇所のみでしか接していないため、熱交換システムの運転時の振動により騒音が発生するという問題がある。   Patent Document 2 is a combination of an inner tube having a spiral groove portion and a smooth outer tube, wherein the inner diameter of the outer tube is larger than the outer diameter of the inner tube. However, in this structure, since the inner tube and the outer tube are not in contact with each other at least in a straight portion of the double tube or only in one place, noise is generated due to vibration during operation of the heat exchange system. is there.

特許文献１には、熱交換サイクルに二重管構造を用いることが示され、かつ、内管の外周面または前記外管の内周面に螺旋状の溝部が形成されていることが示されているものの、それ以上の具体的な二重管の構造に関してはほとんど開示がなされていない。   Patent Document 1 shows that a double tube structure is used for a heat exchange cycle, and that an outer peripheral surface of the inner tube or an inner peripheral surface of the outer tube is formed with a spiral groove. However, there is almost no disclosure regarding the specific structure of the double tube beyond that.

本発明は、かかる背景に鑑みてなされたものであって、運転時において騒音を発することなく使用でき、かつ、優れた熱交換性能を発揮しうる構造を有する熱交換器用二重管を提供しようとするものである。   The present invention has been made in view of such a background, and is intended to provide a double tube for a heat exchanger having a structure that can be used without generating noise during operation and can exhibit excellent heat exchange performance. It is what.

本発明は、外管の内部に内管を配置してなる二重管構造を有し、上記内管の内側を流れる流体と、上記内管と上記外管の間を流れる流体との間の熱交換を行うための熱交換器用二重管であって、
上記内管は、断面形状が三角形の頂点部分を円弧状曲面とした形状を呈し、かつ、上記頂点部分の位置が長手方向において螺旋状に変位した形状を有しており、
上記外管は、断面形状が円形状の平滑管形状を呈しており、
該外管の内周面と上記内管の上記頂点部分とが接しており、上記外管と上記内管との間には周方向３箇所に区画された外側流路が形成されていることを特徴とする熱交換器用二重管にある（請求項１）。 The present invention has a double tube structure in which an inner tube is disposed inside an outer tube, and is between a fluid flowing inside the inner tube and a fluid flowing between the inner tube and the outer tube. A heat exchanger double pipe for performing heat exchange,
The inner tube has a shape in which the cross-sectional shape is a triangular arcuate curved portion, and the position of the apex portion is helically displaced in the longitudinal direction,
The outer tube has a smooth tube shape with a circular cross-sectional shape,
The inner peripheral surface of the outer tube and the apex portion of the inner tube are in contact with each other, and an outer flow path partitioned in three circumferential directions is formed between the outer tube and the inner tube. It is in the double pipe for heat exchangers characterized by these (Claim 1).

本発明の熱交換器用二重管は、上記のごとく、特殊な形状を呈する螺旋状にねじった内管と、円形状の平滑管よりなる外管とから構成されている。そして、内管の３つの上記頂点部分が外管の内周面に接している。これにより、上記内管と外管との間は、上記のごとく、内管の３つの頂点部分によって周方向３箇所に区画された外側流路となり、各外側流路は螺旋状に形成されたものとなる。   As described above, the double pipe for heat exchanger of the present invention is composed of an inner pipe twisted in a spiral shape having a special shape and an outer pipe made of a circular smooth tube. The three apex portions of the inner tube are in contact with the inner peripheral surface of the outer tube. Thereby, between the inner pipe and the outer pipe, as described above, the outer flow path is divided into three places in the circumferential direction by the three apex portions of the inner pipe, and each outer flow path is formed in a spiral shape. It will be a thing.

また、上記内管の内部も、螺旋状にねじれた外壁を有する内側流路となる。それ故、上記二重管の各外側流路と内側流路にそれぞれ流体（冷媒）を流せば、両流路において流体（冷媒）が適度に乱流を起こしながら流れ、効率よく熱交換することができる。   Further, the inside of the inner tube also becomes an inner flow path having an outer wall twisted in a spiral shape. Therefore, if a fluid (refrigerant) flows through each of the outer and inner channels of the double pipe, the fluid (refrigerant) flows in both channels while causing moderate turbulence and efficiently exchanges heat. Can do.

また、上記二重管は、上記内管と外管とが接して一体化している。そのため、上記二重管を組み込んだ熱交換サイクルを運転した際に振動が生じても、上記二重管において内管と外管が衝突して騒音が生じることを確実に防止することができる。   The double pipe is integrated with the inner pipe and the outer pipe in contact with each other. Therefore, even if vibration occurs when operating the heat exchange cycle in which the double pipe is incorporated, it is possible to reliably prevent noise from being generated due to collision between the inner pipe and the outer pipe in the double pipe.

このように、本発明によれば、運転時において騒音を発することなく使用でき、かつ、優れた熱交換性能を発揮しうる構造を有する熱交換器用二重管を提供することができる。   Thus, according to the present invention, it is possible to provide a double tube for a heat exchanger that can be used without generating noise during operation and has a structure that can exhibit excellent heat exchange performance.

実施例１における、二重管の外管のみを示す横断面図。FIG. 3 is a cross-sectional view showing only the outer pipe of the double pipe in the first embodiment. 実施例１における、二重管の内管のみを示す横断面図。FIG. 3 is a cross-sectional view showing only the inner pipe of the double pipe in the first embodiment. 実施例１における、二重管の横断面図。FIG. 2 is a cross-sectional view of a double pipe in Example 1. 実施例１における、二重管形成前の内管及び外管を示す説明図。Explanatory drawing which shows the inner tube | pipe and the outer tube | pipe before Example 2 in Example 1.

上記熱交換器用二重管において、上記内管及び上記外管は、アルミニウム合金あるいは銅合金よりなることが好ましい（請求項２）。ここでいうアルミニウム合金とは、純アルミニウムを含み、アルミニウムを主体とする合金全般を示す。また、銅合金とは、純銅を含み、銅を主体とする合金全般を示す。これらの金属材料は、比較的熱伝達特性に優れており、熱交換性能向上に有効である。また、軽量化を加味すれば、アルミニウム合金を用いることが最も好ましい。   In the double pipe for heat exchanger, the inner pipe and the outer pipe are preferably made of an aluminum alloy or a copper alloy. The aluminum alloy here refers to all alloys including pure aluminum and mainly composed of aluminum. The copper alloy refers to all alloys including pure copper and mainly copper. These metal materials are relatively excellent in heat transfer characteristics and are effective in improving heat exchange performance. In view of weight reduction, it is most preferable to use an aluminum alloy.

材質としてアルミニウム合金を選択する場合には、純アルミニウム（Ａ１０５０、Ａ１１００）、アルミニウム合金（Ａ３００３、Ａ６０６３）等が好ましい。銅を選択する場合には、純銅のりん脱酸銅や、熱伝導性の高い銅合金などがある。
なお材質としては、加工性の良好なものが望ましいが、耐食性や強度が必要な場合にはこれらの材質に限定されることはない。 When an aluminum alloy is selected as the material, pure aluminum (A1050, A1100), aluminum alloy (A3003, A6063), or the like is preferable. When copper is selected, there are pure copper phosphorous deoxidized copper, copper alloy with high thermal conductivity, and the like.
In addition, although a material with favorable workability is desirable as a material, when corrosion resistance and intensity | strength are required, it is not limited to these materials.

また、上記内管の上記螺旋状の変位の軸方向に対する角度が３０〜６０度の範囲にあることが好ましい（請求項３）。上記角度が上記範囲よりも小さい場合には、流体を流す場合の圧損を低減できる一方、乱流効果が少なく熱交換性能向上効果が小さくなるおそれがある。また、上記角度が上記範囲よりも大きい場合には、逆に、流体を流す場合の乱流効果を高めて熱交換性能向上効果を高めることができる一方、圧損が大きくなりすぎるおそれがある。   Moreover, it is preferable that the angle with respect to the axial direction of the said helical displacement of the said inner tube exists in the range of 30-60 degrees (Claim 3). When the angle is smaller than the above range, the pressure loss in flowing the fluid can be reduced, while the turbulent flow effect is small and the heat exchange performance improving effect may be reduced. On the other hand, when the angle is larger than the above range, the effect of improving the heat exchange performance can be enhanced by increasing the turbulent flow effect when flowing the fluid, while the pressure loss may be excessively increased.

また、上記二重管を製造するに当たっては、以下のような方法をとることができる。
まず、上記内管は、上記所望の螺旋形状に対応した形状の内孔を有するダイスを自由回転させながら、素材となる断面円形の平滑管を直線的に引き抜き加工することにより作製することができる。なお、この内管の加工方法としては、ダイスを回転させない加工方法など、その他の加工方法を採用することも可能である。 Moreover, when manufacturing the said double tube, the following methods can be taken.
First, the inner tube can be produced by linearly drawing a smooth tube having a circular cross section as a material while freely rotating a die having an inner hole having a shape corresponding to the desired spiral shape. . As the inner tube processing method, other processing methods such as a processing method in which the die is not rotated may be employed.

また、上記外管は、上記内管の外径よりも大きい内径を有する断面円形の平滑管を素材として用いる。この外管用素材に成形後の上記内管を挿入して、二重管構造とする。次に、この二重管構造のまま、上記外管用素材を縮径引き抜き加工する。これにより、上記内管の円弧状の頂点部先端と外管の内面とを強く当接させることができ、両者が一体化した上記二重管を得ることができる。   The outer tube uses a smooth tube with a circular cross section having an inner diameter larger than the outer diameter of the inner tube as a material. The molded inner pipe is inserted into the outer pipe material to form a double pipe structure. Next, the outer tube material is subjected to reduced diameter drawing while maintaining the double tube structure. As a result, the tip of the arcuate apex of the inner tube and the inner surface of the outer tube can be brought into strong contact, and the double tube in which both are integrated can be obtained.

上記二重管の両端部分については、上記内管の内側流路と、上記内管と外管との間の外側流路にそれぞれ配管が接続されることとなるが、これらの接続構造は、特に限定されるものではなく、種々の構造、種々の接合方法を採用できる。接合方法としては、例えば、かしめ接合法、ろう付け接合、接着接合、摩擦撹拌接合などがある。   For both ends of the double pipe, pipes will be connected to the inner flow path of the inner pipe and the outer flow path between the inner pipe and the outer pipe, respectively. It is not particularly limited, and various structures and various joining methods can be employed. Examples of the joining method include caulking joining method, brazing joining, adhesive joining, and friction stir welding.

また、上記二重管のサイズは、適用する熱交換サイクルの冷媒の流量などに応じて、適宜設計することができる。また、肉厚については、例えば二重管の材質をアルミニウム合金とした場合には、Ａ１０５０を用いた場合には内管の肉厚は１．０〜１．５ｍｍ、外管の肉厚は１．２〜１．８ｍｍ、Ａ３００３を用いた場合には内管の肉厚は０．８〜１．２ｍｍ、外管の肉厚は１．０〜１．５ｍｍ、Ａ６０６３を用いた場合には内管の肉厚は０．６〜１ｍｍ、外管の肉厚は０．８〜１．５ｍｍ程度にすることが好ましい。この範囲に設定すれば、上記二重管を曲げ加工する場合の加工が比較的容易であると共に、曲げ加工時に座屈することを抑制することができる。
同様の理由により、りん脱酸銅を用いた場合には内管の肉厚は０．６〜１．０ｍｍ、外管の肉厚は０．８〜１．５ｍｍ、が適当である。 Moreover, the size of the double pipe can be appropriately designed according to the flow rate of the refrigerant in the heat exchange cycle to be applied. As for the wall thickness, for example, when the material of the double tube is an aluminum alloy, when A1050 is used, the wall thickness of the inner tube is 1.0 to 1.5 mm, and the wall thickness of the outer tube is 1. When using A3003, the inner tube thickness is 0.8 to 1.2 mm, and the outer tube thickness is 1.0 to 1.5 mm. When A6063 is used, the inner tube thickness is 0.8 to 1.2 mm. The thickness of the tube is preferably 0.6 to 1 mm, and the thickness of the outer tube is preferably about 0.8 to 1.5 mm. If it sets to this range, while the said double pipe is bent, the process will be comparatively easy and it can suppress buckling at the time of a bending process.
For the same reason, when phosphorus deoxidized copper is used, it is appropriate that the inner tube has a thickness of 0.6 to 1.0 mm and the outer tube has a thickness of 0.8 to 1.5 mm.

（実施例１）
本発明の熱交換器用二重管につき、図１〜図４を用いて説明する。
本例の二重管１は、図３に示すごとく、外管１０の内部に内管２を配置してなる二重管構造を有し、内管２の内側を流れる流体と、内管２と外管１０の間を流れる流体との間の熱交換を行うための熱交換器用二重管である。 (Example 1)
The double pipe for heat exchangers of the present invention will be described with reference to FIGS.
As shown in FIG. 3, the double pipe 1 of this example has a double pipe structure in which an inner pipe 2 is disposed inside an outer pipe 10, and a fluid flowing inside the inner pipe 2 and an inner pipe 2. It is a double tube for heat exchangers for performing heat exchange between the fluid flowing between the outer tube 10 and the outer tube 10.

内管２は、図２、図４に示すごとく、断面形状が三角形の頂点部分２１を円弧状曲面とした形状を呈している。さらに、図４に示すごとく、内管２は、頂点部分２１の位置が長手方向において螺旋状に変位した形状を有している。
外管１０は、図１、図４に示すごとく、断面形状が円形状の平滑管形状を呈している。
そして、図３に示すごとく、外管１０の内周面と内管２の頂点部分２１とが接しており、外管１０と内管２との間には周方向３箇所に区画された外側流路３１が形成されている。 As shown in FIGS. 2 and 4, the inner tube 2 has a shape in which the apex portion 21 whose cross-sectional shape is a triangle is an arcuate curved surface. Furthermore, as shown in FIG. 4, the inner tube 2 has a shape in which the position of the apex portion 21 is helically displaced in the longitudinal direction.
As shown in FIGS. 1 and 4, the outer tube 10 has a smooth tube shape with a circular cross section.
As shown in FIG. 3, the inner peripheral surface of the outer tube 10 and the apex portion 21 of the inner tube 2 are in contact with each other, and the outer tube 10 and the inner tube 2 are separated from each other in three circumferential directions. A flow path 31 is formed.

上記二重管１は、次のようにして作製した。
まず、素材として、材質Ａ３００３からなる外径１０ｍｍφ、肉厚１．０ｍｍ、長さ５００ｍｍの、断面円形状の押出平滑管を２本準備した。そのうち１本を内管用素材として用い、両端から１００ｍｍを内径８ｍｍφのダイスに通し、縮径加工を行い、引き抜き加工の前処理を実施した。 The double tube 1 was produced as follows.
First, two extruded smooth tubes having an outer diameter of 10 mmφ, a thickness of 1.0 mm, and a length of 500 mm made of material A3003 were prepared as materials. One of them was used as a material for an inner tube, 100 mm from both ends was passed through a die having an inner diameter of 8 mmφ, diameter reduction processing was performed, and pretreatment for drawing processing was performed.

次に、所望の外形状に対応した螺旋状の内孔を有するダイスを用い、その内孔に上記内管用素材の縮径加工済みの先端部を通し、ダイスを自由回転可能な状態にして内管用素材を真っ直ぐに引き抜くことにより上記内管２を成形した。得られた内管２は、図２に示すごとく、軸方向に直交する横断面形状は、どこの位置において略三角形状であって、３つの頂点部分２１が円弧状曲面となっている。また各頂点部分２１の間の部分は、頂点部分２１よりも曲率半径の大きな円弧状曲面となっている。   Next, a die having a spiral inner hole corresponding to the desired outer shape is used, and the inner diameter of the inner tube material is passed through the inner hole so that the die can be freely rotated. The inner pipe 2 was formed by straightly pulling out the pipe material. As shown in FIG. 2, the obtained inner tube 2 has a cross-sectional shape orthogonal to the axial direction that is approximately triangular at any position, and the three apex portions 21 are arc-shaped curved surfaces. Further, the portion between the vertex portions 21 is an arcuate curved surface having a radius of curvature larger than that of the vertex portion 21.

また、同図に示すごとく、内管２の横断面面を軸方向に見ると、上記の略三角形の断面形状の内側には、これに内接する円形状の境界線２６が見え、断面形状の外側には、これに外接する円形状の境界線２７が見える。これらの境界線２６、２７は、内管２が螺旋状にねじれていることによって、各部の最小径部及び最大径部が周方向に変位するために生じるものである。境界線２６の直径ｄ１は５ｍｍ、境界線２７の直径ｄ２は８ｍｍである。また、図４に示すごとく、得られた内管２の螺旋状の変位の方向ｂの軸方向ａに対する角度αはおよそ３０°である。   Further, as shown in the figure, when the cross-sectional surface of the inner tube 2 is viewed in the axial direction, a circular boundary line 26 inscribed in the substantially triangular cross-sectional shape is seen inside the cross-sectional shape, and On the outside, a circular boundary line 27 circumscribing this can be seen. These boundary lines 26 and 27 are generated because the minimum diameter portion and the maximum diameter portion of each portion are displaced in the circumferential direction due to the spiral twist of the inner tube 2. The diameter d1 of the boundary line 26 is 5 mm, and the diameter d2 of the boundary line 27 is 8 mm. Further, as shown in FIG. 4, the angle α of the direction b of the helical displacement of the inner tube 2 obtained with respect to the axial direction a is approximately 30 °.

次に、図４に示すごとく、残りの１本の押出平滑管を外管用素材（以下、単に外管１０という）として用い、その中に上記内管２を挿入して二重管構造とする。この状態では、外管１０の内径と内管２の外径との間に差がある。そのため、外管１０を、内径９ｍｍの円形の内孔を有するダイスに通し、外管１０を縮径加工することにより、外管１０と内管２とを接合して一体化する。
これにより、本例の二重管１が得られる。 Next, as shown in FIG. 4, the remaining one extruded smooth tube is used as a material for an outer tube (hereinafter simply referred to as an outer tube 10), and the inner tube 2 is inserted therein to form a double tube structure. . In this state, there is a difference between the inner diameter of the outer tube 10 and the outer diameter of the inner tube 2. Therefore, the outer tube 10 and the inner tube 2 are joined and integrated by passing the outer tube 10 through a die having a circular inner hole having an inner diameter of 9 mm and reducing the diameter of the outer tube 10.
Thereby, the double pipe 1 of this example is obtained.

二重管１は、上記のごとく、特殊な形状を呈する螺旋状にねじった内管２と、円形状の平滑管よりなる外管１０とから構成されている。そして、内管の３つの頂点部分２１が外管１０の内周面に接している。これにより、内管２と外管１０との間は、内管２の３つの頂点部分２１によって周方向３箇所に区画された外側流路となり、各外側流路３１は螺旋状に形成されたものとなる。   As described above, the double tube 1 includes the inner tube 2 twisted in a spiral shape having a special shape and the outer tube 10 formed of a circular smooth tube. The three apex portions 21 of the inner tube are in contact with the inner peripheral surface of the outer tube 10. Thereby, between the inner pipe 2 and the outer pipe 10, it becomes the outer side flow path divided by the three vertex parts 21 of the inner pipe 2 in the circumferential direction three places, and each outer flow path 31 was formed in the helical form. It will be a thing.

また、内管２の内部も、螺旋状にねじれた外壁を有する内側流路３２となる。それ故、二重管１の各外側流路３１と内側流路３２にそれぞれ流体（冷媒）を流せば、両流路において流体が適度に乱流を起こしながら流れ、効率よく熱交換することができる。   Further, the inside of the inner tube 2 also becomes an inner flow path 32 having an outer wall twisted in a spiral shape. Therefore, if a fluid (refrigerant) is caused to flow in each of the outer flow path 31 and the inner flow path 32 of the double pipe 1, the fluid flows in both flow paths while causing moderate turbulence, and heat can be exchanged efficiently. it can.

また、二重管１は、内管２と外管１０とが接して一体化している。そのため、二重管１を組み込んだ熱交換サイクルを運転した際に振動が生じても、二重管１において内管２と外管２０が衝突して騒音が生じることを確実に防止することができる。
このように、本例によれば、運転時において騒音を発することなく使用でき、かつ、優れた熱交換性能を発揮しうる構造を有する熱交換器用二重管１を提供することができる。 The double pipe 1 is integrated with the inner pipe 2 and the outer pipe 10 in contact with each other. Therefore, even if vibration occurs when the heat exchange cycle incorporating the double pipe 1 is operated, the inner pipe 2 and the outer pipe 20 collide with each other in the double pipe 1 to reliably prevent noise. it can.
Thus, according to this example, it is possible to provide the double pipe 1 for a heat exchanger that can be used without generating noise during operation and has a structure that can exhibit excellent heat exchange performance.

１ 熱交換器用二重管
１０ 外管
２ 内管
２１ 頂点部分
３１ 外側流路 DESCRIPTION OF SYMBOLS 1 Double pipe for heat exchangers 10 Outer pipe 2 Inner pipe 21 Apex part 31 Outer flow path

本発明は、外管の内部に内管を配置してなる二重管構造を有し、上記内管の内側を流れる流体と、上記内管と上記外管の間を流れる流体との間の熱交換を行うための熱交換器用二重管であって、
上記内管は、ダイスの内孔に素材となる断面円形の平滑管を通して上記ダイスを回転させながら直線的に引き抜き加工することにより作製してなり、断面形状が三角形の頂点部分を円弧状曲面とした形状であって上記頂点部分の間の部分を該頂点部分よりも曲率半径の大きな円弧状曲面とした形状を呈し、かつ、上記頂点部分の位置が長手方向において螺旋状に変位した形状を有しており、
上記外管は、断面形状が円形状の平滑管形状を呈しており、
上記外管と上記内管とは、外管用素材に上記内管を挿入して二重管構造とした後、上記外管用素材を縮径引き抜き加工することにより、上記内管の上記頂点部分と上記外管の内面とを当接させており、上記外管と上記内管との間には周方向３箇所に区画された外側流路が形成されていることを特徴とする熱交換器用二重管にある（請求項１）。 The present invention has a double tube structure in which an inner tube is disposed inside an outer tube, and is between a fluid flowing inside the inner tube and a fluid flowing between the inner tube and the outer tube. A heat exchanger double pipe for performing heat exchange,
The inner tube is produced by drawing straightly while rotating the die through a smooth tube having a circular cross section as a raw material in the inner hole of the die, and the apex portion having a triangular cross-sectional shape is an arcuate curved surface. The shape between the apex portions is an arcuate curved surface having a larger radius of curvature than the apex portion, and the apex portion position is helically displaced in the longitudinal direction. And
The outer tube has a smooth tube shape with a circular cross-sectional shape,
The outer tube and the inner tube are formed as a double tube structure by inserting the inner tube into the outer tube material, and then the outer tube material is reduced in diameter so that the apex portion of the inner tube An outer flow path partitioned into three circumferential directions is formed between the outer tube and the inner tube, and the inner surface of the outer tube is in contact with the inner surface of the outer tube. It exists in a heavy pipe (Claim 1).

Claims (3)

外管の内部に内管を配置してなる二重管構造を有し、上記内管の内側を流れる流体と、上記内管と上記外管の間を流れる流体との間の熱交換を行うための熱交換器用二重管であって、
上記内管は、断面形状が三角形の頂点部分を円弧状曲面とした形状を呈し、かつ、上記頂点部分の位置が長手方向において螺旋状に変位した形状を有しており、
上記外管は、断面形状が円形状の平滑管形状を呈しており、
該外管の内周面と上記内管の上記頂点部分とが接しており、上記外管と上記内管との間には周方向３箇所に区画された外側流路が形成されていることを特徴とする熱交換器用二重管。 It has a double tube structure in which an inner tube is arranged inside an outer tube, and performs heat exchange between a fluid flowing inside the inner tube and a fluid flowing between the inner tube and the outer tube. A double pipe for a heat exchanger for
The inner tube has a shape in which the cross-sectional shape is a triangular arcuate curved portion, and the position of the apex portion is helically displaced in the longitudinal direction,
The outer tube has a smooth tube shape with a circular cross-sectional shape,
The inner peripheral surface of the outer tube and the apex portion of the inner tube are in contact with each other, and an outer flow path partitioned in three circumferential directions is formed between the outer tube and the inner tube. A double tube for heat exchangers. 請求項１に記載の熱交換器用二重管において、上記内管及び上記外管は、アルミニウム合金あるいは銅合金よりなることを特徴とする熱交換器用二重管。   2. The double pipe for heat exchanger according to claim 1, wherein the inner pipe and the outer pipe are made of an aluminum alloy or a copper alloy. 請求項１又は２に記載の熱交換器用二重管において、上記内管の上記螺旋状の変位の軸方向に対する角度が３０〜６０度の範囲にあることを特徴とする熱交換器用二重管。   The double tube for a heat exchanger according to claim 1 or 2, wherein an angle of the inner tube with respect to the axial direction of the helical displacement is in a range of 30 to 60 degrees. .
JP2010142240A 2010-06-23 2010-06-23 Double tube for heat exchanger Pending JP2012007767A (en)

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