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JP7109065B2 - Double tube heat exchanger - Google Patents
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JP7109065B2 - Double tube heat exchanger - Google Patents

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JP7109065B2
JP7109065B2 JP2018127948A JP2018127948A JP7109065B2 JP 7109065 B2 JP7109065 B2 JP 7109065B2 JP 2018127948 A JP2018127948 A JP 2018127948A JP 2018127948 A JP2018127948 A JP 2018127948A JP 7109065 B2 JP7109065 B2 JP 7109065B2
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ribs
tube
outer tube
inner tube
heat exchanger
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JP2020008196A (en
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善彦 箱崎
恭平 牛丸
一斉 中嶋
信輔 奥山
勝幸 ▲浜▼田
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Nichirin Co Ltd
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Description

本発明は、外管内に内管が配置された二重管式熱交換器に関する。 TECHNICAL FIELD The present invention relates to a double-tube heat exchanger in which an inner tube is arranged inside an outer tube.

特許文献１には、外管内に内管が配置された二重管式熱交換器であって、外管の内周面に周方向に複数のリブを形成するとともに、内管の内周面に周方向に複数のリブを形成したものが開示されている。内管の内周面に形成された複数のリブは、伝熱面積を増大させて熱交換効率を向上させるためのものである。一方、外管の内周面に形成された複数のリブは、二重管式熱交換器を曲げ加工した際に、外管からの曲げの力を内管に付与して内管を曲げるためのものである。 Patent Document 1 discloses a double-tube heat exchanger in which an inner tube is arranged inside an outer tube, in which a plurality of ribs are formed on the inner peripheral surface of the outer tube, and the inner peripheral surface of the inner tube is provided with a plurality of ribs. is formed with a plurality of ribs in the circumferential direction. A plurality of ribs formed on the inner peripheral surface of the inner tube are for increasing the heat transfer area and improving the heat exchange efficiency. On the other hand, the plurality of ribs formed on the inner peripheral surface of the outer tube are used to bend the inner tube by applying a bending force from the outer tube to the inner tube when bending the double-tube heat exchanger. belongs to.

特許第５２０２０２９号明細書Patent No. 5202029

ところで、特許文献１のように、外管のリブの数と、内管のリブの数とが同数である場合において、二重管式熱交換器を曲げ加工した際に、外管のリブの位置と、内管のリブの位置とが周方向にすべて一致していた場合は、すべてが一致していなかった場合と比べて、曲げ加工後のスプリングバック量が大きくなり、曲げ不良となる場合がある。なお、スプリングバックとは、曲げ加工による変形が元に戻ろうとする現象およびその力である。また、曲げ加工後に、外管と内管との隙間からなる環状流路の断面積が不均一となる場合がある。 By the way, when the number of ribs of the outer tube and the number of ribs of the inner tube are the same as in Patent Document 1, when the double-tube heat exchanger is bent, the number of ribs of the outer tube is If the positions of the ribs on the inner tube all match in the circumferential direction, the amount of springback after bending will increase compared to when they all do not match, resulting in poor bending. There is It should be noted that springback is a phenomenon and its force in which deformation due to bending tends to return to its original state. In addition, after bending, the cross-sectional area of the annular flow path formed by the gap between the outer tube and the inner tube may become uneven.

そこで、特許文献１では、外管のすべてのリブの位置を、内管のすべてのリブの位置に対して周方向にずらしている。 Therefore, in Patent Document 1, the positions of all the ribs of the outer tube are circumferentially displaced from the positions of all the ribs of the inner tube.

しかしながら、外管のすべてのリブの位置を、内管のすべてのリブの位置に対して周方向にずらすためには、目視しながら外管内に内管を挿入したり、予め設けたガイドに沿って外管内に内管を挿入したりする必要があり、作業が煩雑である。 However, in order to shift the positions of all the ribs of the outer tube in the circumferential direction with respect to the positions of all the ribs of the inner tube, it is necessary to visually insert the inner tube into the outer tube or to move along a guide provided in advance. It is necessary to insert the inner tube into the outer tube by means of force, and the work is complicated.

本発明は、上記事情に鑑みてなされたものであって、その目的は、曲げ不良を低減させることが可能な二重管式熱交換器を提供することである。 SUMMARY OF THE INVENTION An object of the present invention is to provide a double-pipe heat exchanger capable of reducing poor bending.

本発明は、内周面に複数のリブが周方向に等間隔で形成された外管と、前記外管内に配置され、内周面に複数のリブが周方向に等間隔で形成された内管と、を有し、前記外管の前記リブの数は、前記内管の前記リブの数よりも多く、前記外管の前記リブの数、および、前記内管の前記リブの数の少なくとも一方は、奇数であり、前記外管における、前記内管が内部に配置された部分に曲げ加工が施されることを特徴とする。 The present invention consists of an outer tube having a plurality of ribs formed on the inner peripheral surface at regular intervals in the circumferential direction, and an inner tube disposed in the outer tube and having a plurality of ribs formed at regular intervals on the inner peripheral surface. and a tube, wherein the number of ribs of the outer tube is greater than the number of ribs of the inner tube, and the number of ribs of the outer tube and the number of ribs of the inner tube At least one of them has an odd number, and is characterized in that a portion of the outer tube inside which the inner tube is arranged is bent .

本発明によれば、外管のリブの数は、内管のリブの数よりも多い。これにより、外管内に内管を配置した際に、外管のリブの位置と、内管のリブの位置とが、周方向にすべて一致することがない。仮に、外管のリブのいずれか１つの位置と、内管のリブのいずれか１つの位置とが周方向に一致したとしても、外管の他のリブの位置と、内管の他のリブの位置とは、ほとんどが周方向に不一致になる。よって、二重管式熱交換器を曲げ加工した際に、曲げ加工後のスプリングバック量を、ほぼ均一にすることができる。これにより、曲げ不良を低減させることができる。また、曲げ加工後に、外管と内管との隙間からなる環状流路の断面積を、ほぼ均一にすることができる。 According to the invention, the number of ribs on the outer tube is greater than the number of ribs on the inner tube. As a result, when the inner tube is arranged inside the outer tube, the positions of the ribs of the outer tube and the positions of the ribs of the inner tube do not all match in the circumferential direction. Even if the position of any one of the ribs of the outer tube coincides with the position of any one of the ribs of the inner tube in the circumferential direction, the positions of the other ribs of the outer tube and the other ribs of the inner tube are not aligned. , most of them are inconsistent in the circumferential direction. Therefore, when the double-pipe heat exchanger is bent, the amount of springback after bending can be made substantially uniform. As a result, bending defects can be reduced. In addition, after bending, the cross-sectional area of the annular flow path formed by the gap between the outer tube and the inner tube can be made substantially uniform.

二重管式熱交換器の断面図である。It is a cross-sectional view of a double-pipe heat exchanger.

以下、本発明の好適な実施の形態について、図面を参照しつつ説明する。 Preferred embodiments of the present invention will be described below with reference to the drawings.

（二重管式熱交換器の構成）
本発明の一実施形態である二重管式熱交換器は、外管内に内管が配置されたものである。なお、本実施形態の二重管式熱交換器は、カーエアコン等の車両用空調装置の冷媒配管などに使用されるものであるが、これに限定されない。 (Structure of double-tube heat exchanger)
A double-tube heat exchanger, which is one embodiment of the present invention, has an inner tube disposed within an outer tube. The double-tube heat exchanger of the present embodiment is used for refrigerant piping of a vehicle air conditioner such as a car air conditioner, but is not limited to this.

二重管式熱交換器１は、断面図である図１に示すように、外管２と、内管３と、を有している。外管２および内管３は、断面形状が円形である。内管３は、外管２内に配置されている。 The double-tube heat exchanger 1 has an outer tube 2 and an inner tube 3, as shown in FIG. 1, which is a cross-sectional view. The outer tube 2 and the inner tube 3 have circular cross-sectional shapes. The inner tube 3 is arranged inside the outer tube 2 .

外管２と内管３との隙間からなる環状流路４には、高温高圧の液体の冷媒が流通される。一方、内管３内には、低温低圧の気体の冷媒が流通される。環状流路４を流れる液体の冷媒と、内管３内を流れる気体の冷媒との間で、熱交換が行われる。なお、環状流路４を流通する冷媒は液体に限定されず、気体や気液混合体であってもよい。また、内管３内を流通する冷媒は気体に限定されず、液体や気液混合体であってもよい。 A high-temperature, high-pressure liquid coolant flows through an annular flow path 4 defined by a gap between the outer tube 2 and the inner tube 3 . On the other hand, a low-temperature, low-pressure gas refrigerant flows through the inner pipe 3 . Heat is exchanged between the liquid refrigerant flowing through the annular channel 4 and the gaseous refrigerant flowing through the inner tube 3 . The refrigerant flowing through the annular flow path 4 is not limited to liquid, and may be gas or a gas-liquid mixture. Moreover, the coolant flowing through the inner tube 3 is not limited to gas, and may be liquid or a gas-liquid mixture.

このような二重管式熱交換器１は、車両内での配置スペースに応じて、曲げ加工が施される。 Such a double-pipe heat exchanger 1 is subjected to a bending process according to the installation space in the vehicle.

外管２の内周面には、複数のリブ１１が周方向に等間隔で形成されている。また、内管３の内周面には、複数のリブ１２が周方向に等間隔で形成されている。外管２は、アルミニウム製であり、押し出し加工によってリブ１１が一体に形成される。内管３も同様である。外管２の各リブ１１は、外管２の軸方向の一端から他端にわたって形成されている。内管３の各リブ１２についても、同様である。 A plurality of ribs 11 are formed on the inner peripheral surface of the outer tube 2 at regular intervals in the circumferential direction. A plurality of ribs 12 are formed on the inner peripheral surface of the inner tube 3 at regular intervals in the circumferential direction. The outer tube 2 is made of aluminum and integrally formed with ribs 11 by extrusion. The inner tube 3 is also the same. Each rib 11 of the outer tube 2 is formed from one axial end to the other axial end of the outer tube 2 . The same is true for each rib 12 of the inner tube 3 .

内管３の内周面に形成された複数のリブ１２は、気体の冷媒との接触面積を増大させて、熱交換効率を向上させるためのものである。一方、外管２の内周面に形成された複数のリブ１１は、二重管式熱交換器１を曲げ加工した際に、外管２からの曲げの力を内管３に付与して内管３を曲げるためのものである。 A plurality of ribs 12 formed on the inner peripheral surface of the inner tube 3 are for increasing the contact area between the gaseous refrigerant and the heat exchange efficiency. On the other hand, the plurality of ribs 11 formed on the inner peripheral surface of the outer tube 2 apply a bending force from the outer tube 2 to the inner tube 3 when the double-tube heat exchanger 1 is bent. It is for bending the inner tube 3 .

外管２のリブ１１と、内管３の外周面との間には、クリアランスが設けられている。このクリアランスにより、外管２内に内管３を好適に挿入することができる。 A clearance is provided between the rib 11 of the outer tube 2 and the outer peripheral surface of the inner tube 3 . This clearance allows the inner tube 3 to be suitably inserted into the outer tube 2 .

本実施形態では、外管２のリブ１１の数は、内管３のリブ１２の数よりも多い。また、本実施形態では、外管２のリブ１１の数は偶数で、内管３のリブ１２の数は奇数である。 In this embodiment, the number of ribs 11 on the outer tube 2 is greater than the number of ribs 12 on the inner tube 3 . Further, in this embodiment, the outer tube 2 has an even number of ribs 11 and the inner tube 3 has an odd number of ribs 12 .

具体的には、外管２のリブ１１の数は８で、内管３のリブ１２の数は５である。なお、外管２のリブ１１の数および内管３のリブ１２の数は、これに限定されない。また、外管２のリブ１１の数が奇数で、内管３のリブ１２の数が偶数であってもよいし、両方の数がそれぞれ奇数であってもよい。 Specifically, the outer tube 2 has eight ribs 11 and the inner tube 3 has five ribs 12 . Note that the number of ribs 11 of the outer tube 2 and the number of ribs 12 of the inner tube 3 are not limited to this. Further, the number of ribs 11 of the outer tube 2 may be odd and the number of ribs 12 of the inner tube 3 may be even, or both may be odd numbers.

ここで、外管２のリブ１１、および、内管３のリブ１２は、周方向に、それぞれ等間隔で形成されている。これは、二重管式熱交換器１を曲げ加工した際に、外管２および内管３が偏平することなく曲がるようにするためである。すなわち、曲げ加工される二重管式熱交換器１においては、外管２のリブ１１、および、内管３のリブ１２が、周方向に、それぞれ等間隔で形成されていることが前提となる。 Here, the ribs 11 of the outer tube 2 and the ribs 12 of the inner tube 3 are formed at regular intervals in the circumferential direction. This is to bend the outer tube 2 and the inner tube 3 without flattening when the double-tube heat exchanger 1 is bent. That is, in the bent double-tube heat exchanger 1, it is assumed that the ribs 11 of the outer tube 2 and the ribs 12 of the inner tube 3 are formed at regular intervals in the circumferential direction. Become.

仮に、外管２のリブ１１の数と、内管３のリブ１２の数とが同数である場合、外管２のリブ１１のいずれか１つの位置と、内管３のリブ１２のいずれか１つの位置とが周方向に一致すれば、外管２の他のリブ１１の位置と、内管３の他のリブ１２の位置とは、周方向にすべて一致することになる。 If the number of ribs 11 of the outer tube 2 and the number of ribs 12 of the inner tube 3 are the same, the position of any one of the ribs 11 of the outer tube 2 and any of the ribs 12 of the inner tube 3 If one position coincides in the circumferential direction, the positions of the other ribs 11 of the outer tube 2 and the positions of the other ribs 12 of the inner tube 3 all coincide in the circumferential direction.

そして、外管２のリブ１１の位置と、内管３のリブ１２の位置とが周方向にすべて一致していた場合は、すべてが一致していなかった場合と比べて、曲げ加工後のスプリングバック量が大きくなる。そして、スプリングバック量が大きな二重管式熱交換器１は、所望の角度に曲がらず、曲げ不良となる。 When the positions of the ribs 11 of the outer tube 2 and the positions of the ribs 12 of the inner tube 3 all coincide in the circumferential direction, compared to the case where they do not all coincide, the spring after bending is reduced. The amount of backing increases. The double-tube heat exchanger 1 having a large amount of springback does not bend at a desired angle, resulting in poor bending.

そこで、本実施形態では、外管２のリブ１１の数を、内管３のリブ１２の数よりも多くしている。具体的には、外管２のリブ１１の数を８にし、内管３のリブ１２の数を５にしている。これにより、外管２内に内管３を配置した際に、外管２のリブ１１の位置と、内管３のリブ１２の位置とが、周方向にすべて一致することがない。仮に、外管２のリブ１１のいずれか１つの位置と、内管３のリブ１２のいずれか１つの位置とが周方向に一致したとしても、外管２の他のリブ１１の位置と、内管３の他のリブ１２の位置とは、周方向にすべて不一致になる。よって、二重管式熱交換器１を曲げ加工した際に、曲げ加工後のスプリングバック量を、ほぼ均一にすることができる。これにより、曲げ不良を低減させることができる。 Therefore, in this embodiment, the number of ribs 11 of the outer tube 2 is made larger than the number of ribs 12 of the inner tube 3 . Specifically, the outer tube 2 has eight ribs 11 and the inner tube 3 has five ribs 12 . Accordingly, when the inner tube 3 is arranged inside the outer tube 2, the positions of the ribs 11 of the outer tube 2 and the positions of the ribs 12 of the inner tube 3 do not all match in the circumferential direction. Even if the position of any one of the ribs 11 of the outer tube 2 coincides with the position of any one of the ribs 12 of the inner tube 3 in the circumferential direction, the positions of the other ribs 11 of the outer tube 2 and The positions of the other ribs 12 of the inner tube 3 do not coincide with each other in the circumferential direction. Therefore, when the double-tube heat exchanger 1 is bent, the amount of springback after bending can be made substantially uniform. As a result, bending defects can be reduced.

なお、外管２のリブ１１の数と内管３のリブ１２の数とが、それぞれ、６本と３本、８本と４本、１０本と５本、１２本と６本である場合のように、外管２のリブ１１の数が、内管３のリブ１２の数の倍数である場合には、外管２内に内管３を配置した際に、外管２のリブ１１の位置と、内管３のリブ１２の位置とが、周方向にすべて一致する可能性が高くなる。よって、このような組み合わせは避けた方がよい。 When the number of ribs 11 of the outer tube 2 and the number of ribs 12 of the inner tube 3 are 6 and 3, 8 and 4, 10 and 5, and 12 and 6, respectively. , when the number of ribs 11 of the outer tube 2 is a multiple of the number of ribs 12 of the inner tube 3, when the inner tube 3 is arranged inside the outer tube 2, the ribs 11 of the outer tube 2 and the positions of the ribs 12 of the inner tube 3 are more likely to coincide in the circumferential direction. Therefore, such combinations should be avoided.

また、内管３のリブ１２の数を奇数にすることで、外管２のリブ１１の位置と、内管３のリブ１２の位置とが、周方向に一致する確率をさらに低減させることができる。これにより、曲げ加工後のスプリングバック量をさらに均一にすることができる。 Further, by setting the number of ribs 12 of the inner tube 3 to an odd number, it is possible to further reduce the probability that the positions of the ribs 11 of the outer tube 2 and the positions of the ribs 12 of the inner tube 3 coincide in the circumferential direction. can. Thereby, the amount of springback after bending can be made more uniform.

さらに、外管２のリブ１１の数と、内管３のリブ１２の数とが、互いに素であることが、より好ましい。このような構成であれば、外管２内に内管３を配置した際に、外管２のリブ１１と、内管３のリブ１２とが周方向に一致する位置は、最大でも１つだけとなる。 Furthermore, it is more preferable that the number of ribs 11 of the outer tube 2 and the number of ribs 12 of the inner tube 3 are relatively prime. With such a configuration, when the inner tube 3 is arranged inside the outer tube 2, there is at most one position where the ribs 11 of the outer tube 2 and the ribs 12 of the inner tube 3 coincide in the circumferential direction. only.

ここで、外管２のリブ１１の数は５以上１３以下、好ましくは７以上１１以下である。外管２のリブ１１の数が多いほど、二重管式熱交換器１を曲げ加工した際に、外管２のリブ１１で、内管３を好適に曲げることができる。その反面、外管２のリブ１１の数が多いほど、外管２と内管３との隙間からなる環状流路４の断面積が小さくなり、圧力損失が大きくなる。そこで、外管２のリブ１１の数を５以上１３以下、好ましくは７以上１１以下にすることで、圧力損失を抑えながら、内管３を好適に曲げることができる。 Here, the number of ribs 11 of the outer tube 2 is 5 or more and 13 or less, preferably 7 or more and 11 or less. As the number of ribs 11 of the outer tube 2 increases, the inner tube 3 can be preferably bent by the ribs 11 of the outer tube 2 when the double-tube heat exchanger 1 is bent. On the other hand, the larger the number of ribs 11 of the outer tube 2, the smaller the cross-sectional area of the annular flow path 4 formed by the gap between the outer tube 2 and the inner tube 3, and the greater the pressure loss. Therefore, by setting the number of ribs 11 of the outer tube 2 to 5 or more and 13 or less, preferably 7 or more and 11 or less, the inner tube 3 can be suitably bent while suppressing the pressure loss.

（効果）
以上に述べたように、本実施形態に係る二重管式熱交換器１によると、外管２のリブ１１の数は、内管３のリブ１２の数よりも多い。これにより、外管２内に内管３を配置した際に、外管２のリブ１１の位置と、内管３のリブ１２の位置とが、周方向にすべて一致することがない。仮に、外管２のリブ１１のいずれか１つの位置と、内管３のリブ１２のいずれか１つの位置とが、周方向に一致したとしても、外管２の他のリブ１１の位置と、内管３の他のリブ１２の位置とは、ほとんどが周方向に不一致になる。よって、二重管式熱交換器１を曲げ加工した際に、曲げ加工後のスプリングバック量を、ほぼ均一にすることができる。これにより、曲げ不良を低減させることができる。 (effect)
As described above, according to the double-tube heat exchanger 1 according to this embodiment, the number of ribs 11 of the outer tube 2 is greater than the number of ribs 12 of the inner tube 3 . Accordingly, when the inner tube 3 is arranged inside the outer tube 2, the positions of the ribs 11 of the outer tube 2 and the positions of the ribs 12 of the inner tube 3 do not all match in the circumferential direction. Even if the position of any one of the ribs 11 of the outer tube 2 coincides with the position of any one of the ribs 12 of the inner tube 3 in the circumferential direction, the positions of the other ribs 11 of the outer tube 2 do not match. , and the positions of the other ribs 12 of the inner tube 3 are mostly inconsistent in the circumferential direction. Therefore, when the double-tube heat exchanger 1 is bent, the amount of springback after bending can be made substantially uniform. As a result, bending defects can be reduced.

また、外管２のリブ１１の数、および、内管３のリブ１２の数の少なくとも一方を奇数にすることで、外管２のリブ１１の位置と、内管３のリブ１２の位置とが、周方向に一致する確率をさらに低減させることができる。これにより、曲げ加工後のスプリングバック量をさらに均一にすることができる。 Further, by setting at least one of the number of ribs 11 of the outer tube 2 and the number of ribs 12 of the inner tube 3 to be an odd number, the positions of the ribs 11 of the outer tube 2 and the positions of the ribs 12 of the inner tube 3 are different. can further reduce the probability of coincidence in the circumferential direction. Thereby, the amount of springback after bending can be made more uniform.

また、外管２のリブ１１の数は５以上１３以下、好ましくは７以上１１以下である。外管２のリブ１１の数が多いほど、二重管式熱交換器１を曲げ加工した際に、外管２のリブ１１で内管３を好適に曲げることができる。その反面、外管２のリブ１１の数が多いほど、外管２と内管３との隙間からなる環状流路４の断面積が小さくなり、圧力損失が大きくなる。そこで、外管２のリブ１１の数を５以上１３以下、好ましくは７以上１１以下にすることで、圧力損失を抑えながら、内管３を好適に曲げることができる。 The number of ribs 11 of the outer tube 2 is 5 or more and 13 or less, preferably 7 or more and 11 or less. As the number of ribs 11 of the outer tube 2 increases, the inner tube 3 can be preferably bent by the ribs 11 of the outer tube 2 when the double-tube heat exchanger 1 is bent. On the other hand, the larger the number of ribs 11 of the outer tube 2, the smaller the cross-sectional area of the annular flow path 4 formed by the gap between the outer tube 2 and the inner tube 3, and the greater the pressure loss. Therefore, by setting the number of ribs 11 of the outer tube 2 to 5 or more and 13 or less, preferably 7 or more and 11 or less, the inner tube 3 can be suitably bent while suppressing the pressure loss.

以上、本発明の実施形態を説明したが、具体例を例示したに過ぎず、特に、本発明を限定するものではなく、具体的構成などは、適宜設計変更可能である。また、発明の実施の形態に記載された、作用および効果は、本発明から生じる最も好適な作用および効果を列挙したに過ぎず、本発明による作用および効果は、本発明の実施の形態に記載されたものに限定されるものではない。 Although the embodiments of the present invention have been described above, the specific examples are merely illustrated, and the present invention is not particularly limited. Further, the actions and effects described in the embodiments of the invention are merely enumerations of the most suitable actions and effects resulting from the present invention, and the actions and effects of the present invention are described in the embodiments of the invention. are not limited to those listed.

１ 二重管式熱交換器
２ 外管
３ 内管
４ 環状流路
１１ リブ
１２ リブ REFERENCE SIGNS LIST 1 double-tube heat exchanger 2 outer tube 3 inner tube 4 annular flow path 11 rib 12 rib

Claims (3)

内周面に複数のリブが周方向に等間隔で形成された外管と、
前記外管内に配置され、内周面に複数のリブが周方向に等間隔で形成された内管と、
を有し、
前記外管の前記リブの数は、前記内管の前記リブの数よりも多く、
前記外管の前記リブの数、および、前記内管の前記リブの数の少なくとも一方は、奇数であり、
前記外管における、前記内管が内部に配置された部分に曲げ加工が施されることを特徴とする、二重管式熱交換器。 an outer tube in which a plurality of ribs are formed on the inner peripheral surface at regular intervals in the circumferential direction;
an inner tube disposed in the outer tube and having a plurality of ribs formed on the inner peripheral surface at regular intervals in the circumferential direction;
has
the number of ribs on the outer tube is greater than the number of ribs on the inner tube ,
at least one of the number of ribs of the outer tube and the number of ribs of the inner tube is an odd number,
A double-tube heat exchanger , wherein a portion of the outer tube in which the inner tube is arranged is bent . 前記外管の前記リブの数が、５以上１３以下であることを特徴とする、請求項１に記載の二重管式熱交換器。 2. The double tube heat exchanger according to claim 1 , wherein the number of said ribs of said outer tube is 5 or more and 13 or less. 前記外管の前記リブの数と、前記内管の前記リブの数とが、互いに素であることを特徴とする、請求項１又は２に記載の二重管式熱交換器。 3. The double tube heat exchanger according to claim 1, wherein the number of said ribs of said outer tube and the number of said ribs of said inner tube are relatively prime.
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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006145056A (en) 2004-11-16 2006-06-08 Matsushita Electric Ind Co Ltd Heat exchanger
JP2011064448A (en) 2009-08-21 2011-03-31 Daikin Industries Ltd Heat exchanger and refrigeration device including the same
US20120199326A1 (en) 2011-02-03 2012-08-09 Visteon Global Technologies, Inc. Internal heat exchanger

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6336875U (en) * 1986-08-21 1988-03-09
JPH086846B2 (en) * 1987-05-22 1996-01-29 昭和アルミニウム株式会社 Fitting method of fitting member to pipe material

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006145056A (en) 2004-11-16 2006-06-08 Matsushita Electric Ind Co Ltd Heat exchanger
JP2011064448A (en) 2009-08-21 2011-03-31 Daikin Industries Ltd Heat exchanger and refrigeration device including the same
US20120199326A1 (en) 2011-02-03 2012-08-09 Visteon Global Technologies, Inc. Internal heat exchanger

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