JP2021196071A - Double-pipe type heat exchanger - Google Patents

Double-pipe type heat exchanger Download PDF

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Publication number
JP2021196071A
JP2021196071A JP2020100315A JP2020100315A JP2021196071A JP 2021196071 A JP2021196071 A JP 2021196071A JP 2020100315 A JP2020100315 A JP 2020100315A JP 2020100315 A JP2020100315 A JP 2020100315A JP 2021196071 A JP2021196071 A JP 2021196071A
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pipe
branch pipe
flat surface
tube
outer pipe
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善彦 箱崎
Yoshihiko Hakozaki
孝博 大西
Takahiro Onishi
恭平 牛丸
Kyohei Ushimaru
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Nichirin Co Ltd
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Nichirin Co Ltd
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Abstract

To improve connection strength between an outer pipe and a branch pipe of a double-pipe type heat exchanger.SOLUTION: An inner pipe 3 is disposed at the inner side of an outer pipe 2. A first branch pipe 4 is connected to the outer pipe 2. The outer pipe 2 has a protruding part 11 protruding outward. The protruding part 11 is formed at a part as seen in a circumferential direction of the outer pipe 2. A hole 12 into which the first branch pipe 4 is inserted is formed at a top part 11T of the protruding part 11. The top part 11T of the protruding part 11 is provided with a flat surface 11s. The flat surface 11s is formed over an entire periphery of the hole 12 in a circumferential direction. The first branch pipe 4 has a tip cylinder part 31 and a flange part 32. The flange part 32 protrudes to the radial outer side farther than the tip cylinder part 31. The tip cylinder part 31 is inserted into the hole 12, and the flange part 32 contacts with the flat surface 11s of the top part 11T.SELECTED DRAWING: Figure 2

Description

本発明は、外管と、外管内に配置された内管とを備えた二重管式熱交換器に関する。 The present invention relates to a double tube heat exchanger including an outer tube and an inner tube arranged inside the outer tube.

外管と、外管内に配置された内管とを備えた二重管式熱交換器が知られている。二重管式熱交換器により、温度が異なる２種類の冷媒の熱交換を行える。例えば、外管と内管との間に高温冷媒を流すとともに、内管内に低温冷媒を流すことにより、高温冷媒と低温冷媒との熱交換が行われる。 A double tube heat exchanger having an outer tube and an inner tube arranged inside the outer tube is known. The double-tube heat exchanger can exchange heat between two types of refrigerants with different temperatures. For example, heat exchange between the high temperature refrigerant and the low temperature refrigerant is performed by flowing the high temperature refrigerant between the outer pipe and the inner pipe and flowing the low temperature refrigerant in the inner pipe.

外管の途中に、冷媒を供給または排出する分岐管が接続されている。分岐管は、外管と内管との間に冷媒を供給する、または、外管と内管との間を流れた冷媒を排出するために使用される。 A branch pipe for supplying or discharging the refrigerant is connected in the middle of the outer pipe. The branch pipe is used to supply a refrigerant between the outer pipe and the inner pipe, or to discharge the refrigerant flowing between the outer pipe and the inner pipe.

特許文献１には、外管と分岐管との接続部分およびその周辺において、外管を周方向全体に膨らませた二重管式熱交換器が開示されている（特許文献１の図１および図２の「膨管部７」参照）。膨管部７により、分岐管との接続部分およびその周辺において、外管と内管との間の空間が大きくなる。これにより、外管と分岐管との接続部分の周辺で、冷媒の流れをよくすることができる。 Patent Document 1 discloses a double-tube heat exchanger in which the outer tube is inflated in the entire circumferential direction in and around the connection portion between the outer tube and the branch tube (FIGS. 1 and 1 of Patent Document 1). See "Expansion tube 7" in 2). The expansion tube portion 7 increases the space between the outer tube and the inner tube in and around the connection portion with the branch pipe. As a result, the flow of the refrigerant can be improved around the connection portion between the outer pipe and the branch pipe.

特開２００９−２０４１６５号公報Japanese Unexamined Patent Publication No. 2009-204165

特許文献１において、外管の周方向全体に膨らんだ「膨管部７」は、円筒状である。「膨管部７」の外面は、周方向全体にわたって曲面である。分岐管は、「膨管部７」の外面に、溶接またはロウ付け等によって接続されるが、「膨管部７」の外面は、どの位置でも、曲面であるため、「膨管部７」の外面に分岐管を配置しにくい。そのため、分岐管と膨管部との間に隙間ができやすく、接続部分が不安定となり、接続強度が低くなりやすい。 In Patent Document 1, the "expanded tube portion 7" that swells in the entire circumferential direction of the outer tube is cylindrical. The outer surface of the "expansion tube portion 7" is a curved surface over the entire circumferential direction. The branch pipe is connected to the outer surface of the "expansion pipe portion 7" by welding or brazing, but since the outer surface of the "expansion pipe portion 7" is curved at any position, the "expansion pipe portion 7" It is difficult to place a branch pipe on the outer surface of the. Therefore, a gap is likely to be formed between the branch pipe and the expansion pipe portion, the connection portion becomes unstable, and the connection strength tends to be low.

本発明は、二重管式熱交換器の外管と分岐管との接続強度を高めることを目的とする。 An object of the present invention is to increase the connection strength between the outer tube and the branch tube of the double tube heat exchanger.

本発明の二重管式熱交換器は、外管と、前記外管の内側に配置された内管と、前記外管に接続される分岐管とを備え、前記外管には、周方向の一部に、外方に向かって突出した突出部が形成され、前記突出部の頂部に、前記分岐管が挿入される孔が形成されており、前記頂部において、前記孔の周囲に、前記孔の周方向全体にわたって平坦な面が形成されており、前記分岐管は、軸方向に、筒部と、前記筒部より径方向外方に突出した鍔部とを有し、前記筒部は、前記孔に挿入されるとともに、前記鍔部が、前記頂部の前記平坦な面に当接する。 The double-tube heat exchanger of the present invention includes an outer pipe, an inner pipe arranged inside the outer pipe, and a branch pipe connected to the outer pipe, and the outer pipe has a circumferential direction. A protruding portion protruding outward is formed in a part of the above portion, and a hole into which the branch pipe is inserted is formed in the top portion of the protruding portion. A flat surface is formed over the entire circumferential direction of the hole, and the branch pipe has a tubular portion and a flange portion that protrudes radially outward from the tubular portion, and the tubular portion has a tubular portion. As it is inserted into the hole, the flange abuts on the flat surface of the top.

本発明によると、二重管式熱交換器の外管と分岐管との接続強度が高い。 According to the present invention, the connection strength between the outer tube and the branch tube of the double tube heat exchanger is high.

本発明の実施形態に係る二重管式熱交換器の一部を示す模式図である。It is a schematic diagram which shows a part of the double tube type heat exchanger which concerns on embodiment of this invention. 図１の外管と第１分岐管との接続部分およびその周辺の断面図（図１のIIの断面図）である。It is sectional drawing (cross-sectional view of II of FIG. 1) of the connection part of the outer tube of FIG. 外管の軸方向に沿った断面図である。It is sectional drawing along the axial direction of the outer pipe. 外管の径方向に沿った断面図（図３Ａのｂ-ｂ線に沿った断面図）である。It is a cross-sectional view along the radial direction of the outer pipe (cross-sectional view along the bb line of FIG. 3A). 外管を一方向から視た図（図３Ａのｃ方向から視た図）である。It is the figure which looked at the outer tube from one direction (the figure which looked at from the c direction of FIG. 3A). 二重管式熱交換器の断面図（図２のIV-IV線に沿った断面図）である。It is sectional drawing (cross-sectional view along line IV-IV of FIG. 2) of the double tube type heat exchanger. 分岐管の軸方向に沿った断面図である。It is sectional drawing along the axial direction of a branch pipe.

以下、本発明の好適な実施形態について説明する。 Hereinafter, preferred embodiments of the present invention will be described.

図１に、二重管式熱交換器の一例を示している。二重管式熱交換器１は、外管２と、内管３と、第１分岐管（分岐管）４と、第２分岐管（分岐管）５とを備える。外管２の内側に、内管３の一部が配置されている。第１分岐管４は、外管２の一端に近い部分に接続されている。第２分岐管５は、外管２の他端に近い部分に接続されている。 FIG. 1 shows an example of a double tube heat exchanger. The double pipe heat exchanger 1 includes an outer pipe 2, an inner pipe 3, a first branch pipe (branch pipe) 4, and a second branch pipe (branch pipe) 5. A part of the inner pipe 3 is arranged inside the outer pipe 2. The first branch pipe 4 is connected to a portion close to one end of the outer pipe 2. The second branch pipe 5 is connected to a portion near the other end of the outer pipe 2.

図１のIIは、外管２と第１分岐管４との接続部分およびその周辺である。図２に、図１のIIの拡大断面図を示している。図２に示すように、外管２の内側に、内管３が配置されている。外管２の孔１２に、第１分岐管４が挿入されている。第１分岐管４は、外管２の外面に、溶接またはロウ付け等（図示省略）によって接続されている。 II of FIG. 1 is a connection portion between the outer pipe 2 and the first branch pipe 4 and its surroundings. FIG. 2 shows an enlarged cross-sectional view of II of FIG. As shown in FIG. 2, the inner pipe 3 is arranged inside the outer pipe 2. The first branch pipe 4 is inserted into the hole 12 of the outer pipe 2. The first branch pipe 4 is connected to the outer surface of the outer pipe 2 by welding, brazing, or the like (not shown).

（外管）
図３Ａ、図３Ｂおよび図３Ｃに、外管２を示している。図３Ａは、図２に示す外管２の断面図であり、外管２の軸方向に沿った断面図である。図３Ｂは、図３Ａのｂ-ｂ線に沿った断面図であり、外管２の径方向に沿った断面図である。図３Ｃは、外管を図３Ａのｃ方向から視た図である。 (Outer pipe)
3A, 3B and 3C show the outer tube 2. FIG. 3A is a cross-sectional view of the outer pipe 2 shown in FIG. 2, which is a cross-sectional view taken along the axial direction of the outer pipe 2. FIG. 3B is a cross-sectional view taken along the line bb of FIG. 3A, and is a cross-sectional view taken along the radial direction of the outer tube 2. FIG. 3C is a view of the outer tube as viewed from the c direction of FIG. 3A.

外管２には、外方に向かって突出した突出部１１が形成されている（図３Ａ、図３Ｂ参照）。突出部１１は、図３Ｂに示すように、外管２の周方向の一部に形成されている。突出部１１は、図３Ａに示すように、外管２の軸方向の一部に形成されている（図３Ｃ参照）。 The outer tube 2 is formed with a protruding portion 11 projecting outward (see FIGS. 3A and 3B). As shown in FIG. 3B, the protruding portion 11 is formed in a part of the outer tube 2 in the circumferential direction. As shown in FIG. 3A, the protrusion 11 is formed in a part of the outer tube 2 in the axial direction (see FIG. 3C).

図３Ｂに示すように、突出部１１の頂部１１Ｔに、孔１２が形成されている。孔１２は、頂部１１Ｔを貫通している。突出部１１の頂部１１Ｔとは、突出部１１において、外方に最も突出した部分である。 As shown in FIG. 3B, a hole 12 is formed in the top portion 11T of the protruding portion 11. The hole 12 penetrates the top 11T. The top portion 11T of the protruding portion 11 is the portion of the protruding portion 11 that protrudes most outward.

孔１２は、後述する第１分岐管４（図５参照）の先端筒部３１の外径より大きい。孔１２は、第１分岐管４の鍔部３２の外径より小さい。 The hole 12 is larger than the outer diameter of the tip cylinder portion 31 of the first branch pipe 4 (see FIG. 5) described later. The hole 12 is smaller than the outer diameter of the flange portion 32 of the first branch pipe 4.

図３Ａおよび図３Ｂに示すように、頂部１１Ｔの頂面には、平坦な面１１ｓが形成されている。頂部１１Ｔの頂面とは、頂部１１Ｔの外面である。平坦な面１１ｓは、孔１２の周囲に形成されている（図３Ｃ参照）。外管２を図３Ａのｃ方向から視たとき、つまり、外管２を孔１２の貫通方向に視たとき、図３Ｃに示すように、孔１２が、頂部１１Ｔの平坦な面１１ｓに、周方向全体に取り囲まれている。本実施形態では、頂部１１Ｔの頂面のすべてが、平坦な面１１ｓである。本発明において、平坦な面とは、曲面を含まない。本発明において、平坦な面は、凹凸が存在せず、且つ、曲がりが全くない、完全な平坦な面に限らない。本発明において、平坦な面は、実質的に平坦とみなすことができる面を含む。 As shown in FIGS. 3A and 3B, a flat surface 11s is formed on the top surface of the top portion 11T. The top surface of the top 11T is the outer surface of the top 11T. The flat surface 11s is formed around the hole 12 (see FIG. 3C). When the outer tube 2 is viewed from the c direction of FIG. 3A, that is, when the outer tube 2 is viewed in the penetrating direction of the hole 12, the hole 12 is formed on the flat surface 11s of the top 11T, as shown in FIG. 3C. Surrounded by the entire circumferential direction. In this embodiment, all of the top surfaces of the top 11T are flat surfaces 11s. In the present invention, the flat surface does not include a curved surface. In the present invention, the flat surface is not limited to a completely flat surface having no unevenness and no bending. In the present invention, a flat surface includes a surface that can be regarded as substantially flat.

図３Ａに示すように、外管２の軸方向について、突出部１１の両側に、外管縮径部１３、１４が形成されている。外管縮径部１３、１４は、突出部１１から軸方向に離れている。外管縮径部１３、１４は、例えば、外管２を径方向内方に加締めることによって形成される。図３Ａには、縮径前の外管（例えば、外管を径方向内方に加締める前）を、二点鎖線で示している。外管縮径部１３、１４は、周方向全体にわたって、他の部分（突出部１１、縮径されていない部分）より、縮径している。 As shown in FIG. 3A, the outer pipe diameter reduction portions 13 and 14 are formed on both sides of the protruding portion 11 in the axial direction of the outer pipe 2. The outer tube reduced diameter portions 13 and 14 are axially separated from the protruding portion 11. The outer pipe reduced diameter portions 13 and 14 are formed, for example, by crimping the outer pipe 2 inward in the radial direction. In FIG. 3A, the outer tube before diameter reduction (for example, before crimping the outer tube inward in the radial direction) is shown by a two-dot chain line. The outer pipe diameter-reduced portions 13 and 14 are reduced in diameter over the entire circumferential direction from other portions (protruding portion 11, non-reduced portion).

（内管）
内管３は、図２に示すように、内管縮径部２１と、波形部２２とを有する。内管縮径部２１は、内管３の他の部分より、縮径している。内管縮径部２１は、例えば、内管３を径方向内方に加締めることによって形成される。内管縮径部２１は、外管２と第１分岐管４との接続部分の内側に配置されている。 (Inner tube)
As shown in FIG. 2, the inner tube 3 has an inner tube reduced diameter portion 21 and a corrugated portion 22. The inner pipe diameter-reduced portion 21 has a smaller diameter than the other parts of the inner pipe 3. The inner pipe reduced diameter portion 21 is formed, for example, by crimping the inner pipe 3 inward in the radial direction. The inner pipe reduced diameter portion 21 is arranged inside the connecting portion between the outer pipe 2 and the first branch pipe 4.

波形部２２には、図４に示すように、凹状の溝が、周方向に、所定の間隔で形成されている。波形部２２は、図１に示す、外管２と第１分岐管４との接続部分から、外管２と第２分岐管５との接続部分までの間に、配置されている。 As shown in FIG. 4, concave grooves are formed in the corrugated portion 22 in the circumferential direction at predetermined intervals. The corrugated portion 22 is arranged between the connection portion between the outer pipe 2 and the first branch pipe 4 and the connection portion between the outer pipe 2 and the second branch pipe 5 shown in FIG.

（分岐管）
第１分岐管４は、図５に示すように、先端筒部３１と、鍔部３２と、中間筒部３３とを有する。鍔部３２は、先端筒部３１と中間筒部３３との間に形成されている。鍔部３２は、先端筒部３１および中間筒部３３より、径方向外方に突出している。先端筒部３１は、第１分岐管４の一端部である。先端筒部３１の一端は、第１分岐管４の一端４ａである。鍔部３２は、第１分岐管４の一端４ａに近い。 (Branch pipe)
As shown in FIG. 5, the first branch pipe 4 has a tip cylinder portion 31, a flange portion 32, and an intermediate cylinder portion 33. The flange portion 32 is formed between the tip cylinder portion 31 and the intermediate cylinder portion 33. The flange portion 32 projects radially outward from the tip cylinder portion 31 and the intermediate cylinder portion 33. The tip tube portion 31 is one end of the first branch pipe 4. One end of the tip tube portion 31 is one end 4a of the first branch pipe 4. The flange portion 32 is close to one end 4a of the first branch pipe 4.

図５中において、鍔部３２の下面を「鍔面３２ｐ」とする。鍔面３２ｐは、先端筒部３１に最も近い面である。鍔面３２ｐは、平坦な面である。鍔面３２ｐは、例えば、第１分岐管４の径方向に沿った平坦な面である。 In FIG. 5, the lower surface of the flange portion 32 is referred to as a “flange surface 32p”. The flange surface 32p is the surface closest to the tip cylinder portion 31. The flange surface 32p is a flat surface. The flange surface 32p is, for example, a flat surface along the radial direction of the first branch pipe 4.

第１分岐管４を外管２に接続するとき、第１分岐管４の先端筒部３１は、図２に示すように、外管２の孔１２に挿入される。鍔部３２は、外管２の突出部１１に当接する。図２の拡大図に示すように、鍔部３２の鍔面３２ｐは、突出部１１の頂部１１Ｔに対向している。鍔面３２ｐは、頂部１１Ｔの平坦な面１１ｓに対向している。 When the first branch pipe 4 is connected to the outer pipe 2, the tip cylinder portion 31 of the first branch pipe 4 is inserted into the hole 12 of the outer pipe 2 as shown in FIG. The flange portion 32 comes into contact with the protruding portion 11 of the outer pipe 2. As shown in the enlarged view of FIG. 2, the flange surface 32p of the flange portion 32 faces the top portion 11T of the protrusion portion 11. The flange surface 32p faces the flat surface 11s of the top 11T.

平坦な鍔面３２ｐが、頂部１１Ｔの平坦な面１１ｓに当接する。鍔面３２ｐと、平坦な面１１ｓとは、いずれも平坦な面であるため、鍔面３２ｐと、平坦な面１１ｓとは、面接触する（図２の拡大図および図４の拡大図参照）。言い換えると、鍔面３２ｐの一定の領域と、平坦な面１１ｓの一定の領域とが、平坦な面同士で接触している。鍔面３２ｐと、平坦な面１１ｓとが、面接触した状態で、第１分岐管４は、外管２に、溶接またはロウ付け等によって接続される。 The flat flange surface 32p abuts on the flat surface 11s of the top 11T. Since the flange surface 32p and the flat surface 11s are both flat surfaces, the flange surface 32p and the flat surface 11s are in surface contact with each other (see the enlarged view of FIG. 2 and the enlarged view of FIG. 4). .. In other words, a certain region of the flange surface 32p and a certain region of the flat surface 11s are in contact with each other. The first branch pipe 4 is connected to the outer pipe 2 by welding, brazing, or the like in a state where the flange surface 32p and the flat surface 11s are in surface contact with each other.

上記では、第１分岐管４、および、第１分岐管４と外管２との接続部分について説明したが、図１に示す第２分岐管５、および、第２分岐管５と外管２との接続部分についても、上記と同様な構成である。 In the above, the first branch pipe 4 and the connection portion between the first branch pipe 4 and the outer pipe 2 have been described, but the second branch pipe 5 shown in FIG. 1 and the second branch pipe 5 and the outer pipe 2 have been described. The connection portion with and is also configured in the same manner as described above.

以上のように、本実施形態に係る二重管式熱交換器１によると、以下の効果が得られる。 As described above, according to the double tube heat exchanger 1 according to the present embodiment, the following effects can be obtained.

図２に示すように、外管２には、第１分岐管４との接続部分に、突出部１１が形成されている。突出部１１は、外管２の周方向の一部を突出させた部分である。突出部１１により、第１分岐管４との接続部分の内側で、外管２と内管３との間の空間を大きくすることができる。従来、外管と第１分岐管との接続部分において、外管を周方向全体に膨らませていたが、外管２の周方向の一部だけを突出させるという簡易な構成により、外管２と内管３との間の空間を大きくすることができる。 As shown in FIG. 2, the outer pipe 2 is formed with a protruding portion 11 at a connecting portion with the first branch pipe 4. The protruding portion 11 is a portion in which a part of the outer tube 2 in the circumferential direction is projected. The protrusion 11 can increase the space between the outer pipe 2 and the inner pipe 3 inside the connection portion with the first branch pipe 4. Conventionally, at the connection portion between the outer pipe and the first branch pipe, the outer pipe is inflated in the entire circumferential direction, but due to a simple configuration in which only a part of the outer pipe 2 in the circumferential direction is projected, the outer pipe 2 and The space between the inner pipe 3 and the inner pipe 3 can be increased.

突出部１１は、外管２の周方向の一部だけを突出させた部分である。そのため、突出部１１の頂部１１Ｔに、平坦な面１１ｓを形成することができる（図２の拡大図参照）。第１分岐管４の鍔部３２を、頂部１１Ｔの平坦な面１１ｓに当接させた状態において、鍔部３２と頂部１１Ｔの平坦な面１１ｓとの間に隙間が殆ど存在しない。
従来、上述したように、外管と第１分岐管との接続部分において、外管を周方向全体に膨らませていたが、外管の膨らんだ部分の外面は、周方向全体にわたって曲面である。分岐管は、外管の曲面の上に配置されるため、分岐管と外管との間に隙間ができやすかった。そのため、分岐管と外管との接続部分が不安定となり、分岐管と外管との接続強度が低かった。本実施形態によると、図２に示すように、第１分岐管４の鍔部３２が、外管２の頂部１１Ｔの平坦な面１１ｓに当接するため、鍔部３２と頂部１１Ｔの平坦な面１１ｓとの間に隙間が殆ど存在しない。また、鍔部３２と頂部１１Ｔの平坦な面１１ｓとの接触面積が、従来に比べ大きい。したがって、第１分岐管４が、外管２に安定して配置される。この状態で、第１分岐管４と外管２とを溶接またはロウ付け等することにより、第１分岐管４と外管２との接続強度を高められる。 The protruding portion 11 is a portion in which only a part of the outer tube 2 in the circumferential direction is projected. Therefore, a flat surface 11s can be formed on the top portion 11T of the protruding portion 11 (see the enlarged view of FIG. 2). In a state where the flange portion 32 of the first branch pipe 4 is in contact with the flat surface 11s of the top portion 11T, there is almost no gap between the flange portion 32 and the flat surface 11s of the top portion 11T.
Conventionally, as described above, in the connection portion between the outer pipe and the first branch pipe, the outer pipe is inflated in the entire circumferential direction, but the outer surface of the inflated portion of the outer pipe is a curved surface in the entire circumferential direction. Since the branch pipe is placed on the curved surface of the outer pipe, it is easy to create a gap between the branch pipe and the outer pipe. Therefore, the connection portion between the branch pipe and the outer pipe became unstable, and the connection strength between the branch pipe and the outer pipe was low. According to the present embodiment, as shown in FIG. 2, since the flange portion 32 of the first branch pipe 4 abuts on the flat surface 11s of the top portion 11T of the outer pipe 2, the flat surface of the flange portion 32 and the top portion 11T. There is almost no gap between the 11s and 11s. Further, the contact area between the flange portion 32 and the flat surface 11s of the top portion 11T is larger than that of the conventional case. Therefore, the first branch pipe 4 is stably arranged in the outer pipe 2. In this state, the connection strength between the first branch pipe 4 and the outer pipe 2 can be increased by welding or brazing the first branch pipe 4 and the outer pipe 2.

また、鍔部３２の鍔面３２ｐも、平坦な面である（図２の拡大図参照）。平坦な鍔面３２ｐと、頂部１１Ｔの平坦な面１１ｓとが当接した場合、これらの間に隙間が殆ど存在しない。また、平坦な面同士で面接触するため、鍔面３２ｐと平坦な面１１ｓとの接触面積が、より大きい。そのため、第１分岐管４が、外管２により安定して配置されることにより、第１分岐管４と外管２との接続強度がより高まる。 Further, the flange surface 32p of the flange portion 32 is also a flat surface (see the enlarged view of FIG. 2). When the flat flange surface 32p and the flat surface 11s of the top portion 11T come into contact with each other, there is almost no gap between them. Further, since the flat surfaces are in surface contact with each other, the contact area between the flange surface 32p and the flat surface 11s is larger. Therefore, the first branch pipe 4 is stably arranged by the outer pipe 2, so that the connection strength between the first branch pipe 4 and the outer pipe 2 is further increased.

また、第１分岐管４を外管２に接続するとき、図２に示すように、第１分岐管４の先端筒部３１が、外管２の孔１２に挿入されるため、第１分岐管４の位置決めが可能となる。 Further, when the first branch pipe 4 is connected to the outer pipe 2, as shown in FIG. 2, the tip cylinder portion 31 of the first branch pipe 4 is inserted into the hole 12 of the outer pipe 2, so that the first branch is formed. Positioning of the tube 4 becomes possible.

上記では、外管２と第１分岐管４との接続部分の効果について説明したが、図１に示す外管２と第２分岐管５との接続部分についても、上記と同様な効果が得られる。 In the above, the effect of the connection portion between the outer pipe 2 and the first branch pipe 4 has been described, but the same effect as described above can be obtained for the connection portion between the outer pipe 2 and the second branch pipe 5 shown in FIG. Be done.

以上、本発明の実施形態について、図面に基づいて説明したが、具体的な構成は、これらの実施形態に限定されるものでないと考えられるべきである。そして、本発明の範囲は、上記した説明ではなく、特許請求の範囲によって示され、特許請求の範囲と均等の意味および範囲内でのすべての変更が含まれる。 Although the embodiments of the present invention have been described above with reference to the drawings, it should be considered that the specific configuration is not limited to these embodiments. And the scope of the present invention is shown by the scope of claims, not the above description, and includes all modifications within the meaning and scope equivalent to the scope of claims.

例えば、上記実施形態では、図５に示すように、第１分岐管４の鍔部３２の鍔面３２ｐが平坦な面である。しかし、第１分岐管４の鍔部３２の鍔面３２ｐは、平坦な面でなくてもよい。例えば、鍔面３２ｐが曲面でもよい。 For example, in the above embodiment, as shown in FIG. 5, the flange surface 32p of the flange portion 32 of the first branch pipe 4 is a flat surface. However, the flange surface 32p of the flange portion 32 of the first branch pipe 4 does not have to be a flat surface. For example, the flange surface 32p may be a curved surface.

また、上記実施形態では、図３Ａ〜図３Ｃに示すように、外管２の突出部１１の頂部１１Ｔの頂面の全体が、平坦な面１１ｓである。しかし、孔１２の周囲において、孔１２の周方向全体に平坦な面が形成されていれば、頂部１１Ｔの頂面の全体が平坦な面でなくてもよい。例えば、頂部１１Ｔの頂面の外周縁部が平坦な面でなくてもよい。 Further, in the above embodiment, as shown in FIGS. 3A to 3C, the entire top surface of the top portion 11T of the protrusion 11 of the outer tube 2 is a flat surface 11s. However, if a flat surface is formed around the hole 12 in the entire circumferential direction of the hole 12, the entire top surface of the top portion 11T does not have to be a flat surface. For example, the outer peripheral edge of the top surface of the top 11T does not have to be a flat surface.

また、上記実施形態では、図２に示すように、内管３が、内管縮径部２１と波形部２２とを有する。しかし、内管３の構成は、図２に示す構成に限定されない。 Further, in the above embodiment, as shown in FIG. 2, the inner pipe 3 has an inner pipe reduced diameter portion 21 and a corrugated portion 22. However, the configuration of the inner pipe 3 is not limited to the configuration shown in FIG.

１ 二重管式熱交換器
２ 外管
３ 内管
４ 第１分岐管（分岐管）
４ａ 一端
５ 第２分岐管（分岐管）
１１ 突出部
１１Ｔ 頂部
１１ｓ 平坦な面
１２ 孔
１３、１４ 外管縮径部
２１ 内管縮径部
２２ 波形部
３１ 先端筒部（筒部）
３２ 鍔部
３２ｐ 鍔面
３３ 中間筒部 1 Double pipe heat exchanger 2 Outer pipe 3 Inner pipe 4 First branch pipe (branch pipe)
4a One end 5 Second branch pipe (branch pipe)
11 Protruding part 11T Top 11s Flat surface 12 Holes 13, 14 Outer pipe diameter reduction part 21 Inner pipe diameter reduction part 22 Corrugated part 31 Tip cylinder part (tube part)
32 collar part 32p collar surface 33 intermediate cylinder part

本発明の二重管式熱交換器は、外管と、前記外管の内側に配置された内管と、前記外管に接続される複数の分岐管とを備え、前記外管には、周方向の一部に、外方に向かって突出し、且つ、前記外管の長手方向に離れた複数の突出部が形成され、複数の前記突出部の頂部のそれぞれに、複数の前記分岐管のそれぞれが挿入される孔が形成されており、複数の前記頂部のそれぞれにおいて、前記孔の周囲に、前記孔の周方向全体にわたって平坦な面が形成されており、複数の前記分岐管は、軸方向に、筒部と、前記筒部より径方向外方に突出した鍔部とを有し、前記筒部は、前記孔に挿入されるとともに、前記鍔部が、前記頂部の前記平坦な面に当接する。
The double tube type heat exchanger of the present invention includes an outer tube, an inner tube arranged inside the outer tube, and a plurality of branch pipes connected to the outer tube. some of the circumferential direction, projecting outward, and the plurality of protruding portions spaced in the longitudinal direction of the outer tube is formed, on top of each of the plurality of the protrusions, a plurality of the branch pipe of are each hole is inserted formed in each of a plurality of said top, around the hole, said has a flat surface over the entire circumferential direction is formed of holes, the plurality of the branch pipe, It has a tubular portion in the axial direction and a flange portion that protrudes radially outward from the tubular portion. The tubular portion is inserted into the hole, and the flange portion is flat on the top portion. Contact the surface.

Claims (2)

外管と、
前記外管の内側に配置された内管と、
前記外管に接続される分岐管と
を備え、
前記外管には、周方向の一部に、外方に向かって突出した突出部が形成され、
前記突出部の頂部に、前記分岐管が挿入される孔が形成されており、
前記頂部において、前記孔の周囲に、前記孔の周方向全体にわたって平坦な面が形成されており、
前記分岐管は、軸方向に、筒部と、前記筒部より径方向外方に突出した鍔部とを有し、
前記筒部は、前記孔に挿入されるとともに、前記鍔部が、前記頂部の前記平坦な面に当接することを特徴とする二重管式熱交換器。 With the outer pipe
The inner tube arranged inside the outer tube and
With a branch pipe connected to the outer pipe,
The outer pipe is formed with a protruding portion protruding outward in a part in the circumferential direction.
A hole into which the branch pipe is inserted is formed at the top of the protrusion.
At the top, a flat surface is formed around the hole over the entire circumferential direction of the hole.
The branch pipe has a tubular portion in the axial direction and a flange portion that protrudes radially outward from the tubular portion.
A double-tube heat exchanger characterized in that the tubular portion is inserted into the hole and the flange portion abuts on the flat surface of the top portion. 前記鍔部において、前記頂部の前記平坦な面に対向する面が平坦な面であり、
前記鍔部の平坦な面が、前記頂部の前記平坦な面に当接す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。 In the collar portion, the surface of the top portion facing the flat surface is a flat surface.
The double tube heat exchanger according to claim 1, wherein the flat surface of the flange portion abuts on the flat surface of the top portion.
JP2020100315A 2020-06-09 2020-06-09 Double-pipe type heat exchanger Pending JP2021196071A (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0371942A (en) * 1989-08-09 1991-03-27 Showa Alum Corp Double tube heat exchanger of aluminum
JPH04161798A (en) * 1990-10-26 1992-06-05 Showa Alum Corp Double tube heat exchanger
JPH09113155A (en) * 1995-10-20 1997-05-02 Denso Corp Triple-tube type heat exchanger
JP2004069210A (en) * 2002-08-08 2004-03-04 Mahle Tennex Corp Multi-pipe type heat exchanger and manufacturing method thereof
JP2018021699A (en) * 2016-08-03 2018-02-08 カルソニックカンセイ株式会社 Double pipe

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0371942A (en) * 1989-08-09 1991-03-27 Showa Alum Corp Double tube heat exchanger of aluminum
JPH04161798A (en) * 1990-10-26 1992-06-05 Showa Alum Corp Double tube heat exchanger
JPH09113155A (en) * 1995-10-20 1997-05-02 Denso Corp Triple-tube type heat exchanger
JP2004069210A (en) * 2002-08-08 2004-03-04 Mahle Tennex Corp Multi-pipe type heat exchanger and manufacturing method thereof
JP2018021699A (en) * 2016-08-03 2018-02-08 カルソニックカンセイ株式会社 Double pipe

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