JP2000079417A - Method for bending double-tube type heat exchanger - Google Patents
Method for bending double-tube type heat exchangerInfo
- Publication number
- JP2000079417A JP2000079417A JP10251689A JP25168998A JP2000079417A JP 2000079417 A JP2000079417 A JP 2000079417A JP 10251689 A JP10251689 A JP 10251689A JP 25168998 A JP25168998 A JP 25168998A JP 2000079417 A JP2000079417 A JP 2000079417A
- Authority
- JP
- Japan
- Prior art keywords
- tube
- bending
- heat exchanger
- pipe
- double
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- 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
- 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
- F28D7/14—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 both tubes being bent
-
- 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
- F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
- F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
- F28F1/126—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element consisting of zig-zag shaped fins
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Geometry (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、二重管式熱交換器
の曲げ加工方法に関する。特に、内管に高速の高温ガス
（気体）を、外管に冷却水（液体）を通過させて熱交換
を行う熱交換器、例えば、内燃機関の排気ガスを冷却水
により冷却する排気冷却器（高度の熱交換能が要求され
る）等を曲げ加工するのに好適な発明である。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for bending a double tube heat exchanger. In particular, a heat exchanger that exchanges heat by passing high-speed high-temperature gas (gas) through the inner pipe and cooling water (liquid) through the outer pipe, for example, an exhaust cooler that cools exhaust gas of an internal combustion engine with cooling water The present invention is suitable for bending (for example, a high heat exchange ability is required).
【０００２】[0002]
【背景技術】二重管式熱交換器としては、図１・２に示
す如く、内管１２を外管１４に挿通させ、外管１４の両
端部を内管１２の外壁に溶接したものがある。外管１４
の両端部には、冷却水の入口ノズル１６及び出口ノズル
１８を向流／並流使用できるように形成されている（図
例では向流）。なお、２０は管フランジである。2. Description of the Related Art As shown in FIGS. 1 and 2, a double-pipe heat exchanger is one in which an inner pipe 12 is inserted into an outer pipe 14 and both ends of the outer pipe 14 are welded to the outer wall of the inner pipe 12. is there. Outer tube 14
The cooling water inlet nozzle 16 and outlet nozzle 18 are formed at both ends so that they can be used in countercurrent / cocurrent (countercurrent in the example in the figure). In addition, 20 is a pipe flange.
【０００３】図１・２に示すような構成では、熱交換が
内管１２の壁面だけであり、伝熱面積が小さく、かつ、
内管１２の中心部側を流れる流体の熱交換が行い難く熱
交換効率が低い。即ち、全体として大きな熱交換能を得
難かった。In the configuration shown in FIGS. 1 and 2, heat exchange is performed only on the wall surface of the inner tube 12, the heat transfer area is small, and
Heat exchange of the fluid flowing through the center of the inner tube 12 is difficult, and the heat exchange efficiency is low. That is, it was difficult to obtain a large heat exchange capacity as a whole.
【０００４】このため、図３・４に示すような、複数本
（図例では４本）の細径の内管１２Ａを外管１４の内側
に挿通させた多管式タイプが、通常、使用されている。
この構成では、伝熱面積が増大するとともに、中心部側
を流れる流体に対しても熱交換を行うことができ、大き
な熱交換能を得易い。For this reason, as shown in FIGS. 3 and 4, a multi-tube type in which a plurality of (four in the illustrated example) small-diameter inner tubes 12A are inserted into the outer tube 14 is usually used. Have been.
With this configuration, the heat transfer area is increased, and heat exchange can be performed with respect to the fluid flowing on the central portion side, so that a large heat exchange capability is easily obtained.
【０００５】しかし、図３・４に示す多管式タイプのも
のでは、製造工数がかさみ、かつ、重量も増大する傾向
にある。However, the multi-tube type shown in FIGS. 3 and 4 tends to increase the number of manufacturing steps and increase the weight.
【０００６】このため、本願発明者らは、先に、図１・
２に示す構成の二重管式熱交換器において、図５に示す
如く、内管１２に、横断面放射状の波形チューブで形成
された波形の伝熱フィン２２を、内管１２の管壁内側に
接して配した熱交換器を提案した（特願平９−１８２５
７１号：特開平 − 号公報参照、出願時未
公開）。伝熱面積の増大と内管１２の中心部を流れる流
体の熱交換も可能として、熱交換能を増大させる。[0006] For this reason, the inventors of the present invention have previously described FIG.
In the double-pipe heat exchanger having the configuration shown in FIG. 2, a corrugated heat transfer fin 22 formed of a corrugated tube having a radial cross section is provided on the inner pipe 12 as shown in FIG. (Japanese Patent Application No. 9-1825)
No. 71: See Japanese Patent Application Laid-Open No. Hei. The heat transfer area can be increased and the fluid flowing through the center of the inner tube 12 can be exchanged with heat, thereby increasing the heat exchange capacity.
【０００７】該伝熱フィン２２は、図６に示す如くプレ
ス加工等により形成した金属波板２４をチューブ状にな
るように巻き回した状態で、内管１２に挿入し、波板２
４の頂部２４ａを内管１２の壁面にロウ付けして形成し
ていた。The heat transfer fins 22 are inserted into the inner tube 12 in a state where a metal corrugated plate 24 formed by press working or the like is wound into a tube shape as shown in FIG.
4 was formed by brazing the top 24a to the wall surface of the inner tube 12.
【０００８】[0008]
【発明が解決しようとする課題】図５に示す構成の熱交
換器において、省スペース化を図るため等の理由によ
り、曲げ加工をする必要が生じてきた。In the heat exchanger having the structure shown in FIG. 5, it has become necessary to perform bending work for reasons such as space saving.
【０００９】曲げ加工をする際の中間部の空間偏肉ない
し閉塞現象の発生を防止する見地から、砂、可撓性材料
等の不定型材料を注入して曲げ加工をする方法が従来周
知である。[0009] From the viewpoint of preventing the occurrence of spatial unevenness or blockage of the intermediate portion during bending, a method of bending by injecting an indefinite material such as sand or a flexible material is well known. is there.
【００１０】しかし、この曲げ加工方法の場合、二重管
内に充填する手間、特に、外側管への充填・排出の手間
がかかり、面倒であった。さらに、内管の管壁に接して
波形の伝熱フィンが存在するために、内管と伝熱フィン
との間に充填された充填物が排除できないおそれがあっ
た。[0010] However, in the case of this bending method, it takes time and effort to fill the inside of the double pipe, and particularly, it takes time and effort to fill and discharge the outer pipe. Furthermore, since the corrugated heat transfer fins are present in contact with the inner wall of the inner tube, there is a possibility that the filler filled between the inner tube and the heat transfer fins cannot be removed.
【００１１】この際、不定型材料として、水を注入して
凍らせて曲げ加工する方法もあるが、図５に示すよう
な、内管１２側に波形の伝熱フィン２２を備えたものに
おいては、困難視されていた。At this time, as the irregular-shaped material, there is also a method of bending by injecting water and freezing it. However, as shown in FIG. 5, a material having a corrugated heat transfer fin 22 on the inner tube 12 side is used. Had been seen as difficult.
【００１２】即ち、水を凍結させる際に、外側から凍っ
ていくが、内側までは閉塞ないし空間偏肉を阻止できる
ような十分な強度の凍結状態を確保するのは困難であ
る。したがって、従来は、単純二重構造のものしか適用
されていなかった（中村正信著「パイプ加工法」日刊工
業新聞社、ｐ２０１〜２０２）。That is, when freezing water, it freezes from the outside, but it is difficult to secure a frozen state of sufficient strength to prevent blockage or uneven thickness of the space up to the inside. Therefore, conventionally, only a simple double structure was applied (Nakamura Masanobu, "Pipe processing method", Nikkan Kogyo Shimbun, p. 201-202).
【００１３】本発明は、上記にかんがみて、内管側に伝
熱フィンを備えていても、偏肉空間や閉塞現象を発生さ
せずに安定して曲げ加工ができる二重管式熱交換器の曲
げ加工方法を提供することを目的とする。[0013] In view of the above, the present invention provides a double-pipe heat exchanger that can be bent stably without causing uneven wall thickness or clogging even if a heat transfer fin is provided on the inner pipe side. It is an object of the present invention to provide a bending method.
【００１４】[0014]
【課題を解決するための手段】本願発明の二重管式熱交
換器の曲げ加工方法は、上記課題を、下記構成により解
決するものである。SUMMARY OF THE INVENTION A method for bending a double-pipe heat exchanger according to the present invention solves the above-mentioned problems by the following constitution.
【００１５】内管と外管とを備え、前記内管側および外
管側に、それぞれ、高温側流体通路および低温側流体通
路のどちらか一方づつを備え、内管側に波形の伝熱フィ
ンが管壁に接して配されているものである二重管式熱交
換器を曲げ加工するに際して、内管及び外管の双方に水
を充満させて流出不可に閉じて、該水を凍らさせて氷と
した状態で、曲げ加工を行った後、前記氷を解かして除
去することとを特徴とする。An inner tube and an outer tube are provided, and one of a high-temperature fluid passage and a low-temperature fluid passage is provided on each of the inner tube side and the outer tube side, and a corrugated heat transfer fin is provided on the inner tube side. When bending the double-pipe heat exchanger, which is disposed in contact with the pipe wall, both the inner pipe and the outer pipe are filled with water and closed so that they cannot flow out, and the water is frozen. And performing bending in a state where the ice is used, and then melting and removing the ice.
【００１６】二重管式熱交換器の内側曲げ角度は、通
常、１５０°〜０°とする。The inside bending angle of the double-pipe heat exchanger is usually set to 150 ° to 0 °.
【００１７】二重管式熱交換器の曲げ加工は、ドロー曲
げ又はプレス曲げにより行う。The bending of the double-pipe heat exchanger is performed by draw bending or press bending.
【００１８】[0018]
【発明の作用・効果】本発明の二重管式熱交換器の曲げ
加工方法は、後述の実施例で示す如く、内管側に伝熱フ
ィンを備えていても、偏肉空間や閉塞現象を発生させず
に安定して曲げ加工ができる。そして、二重乾式熱交換
器の偏肉空間や閉塞現象の発生阻止のための充填材の流
入・排出も水の状態で行うため容易であり、該水は再使
用できる。According to the bending method of the double-pipe heat exchanger of the present invention, even if a heat transfer fin is provided on the inner pipe side, even if the inner pipe side is provided with a heat transfer fin, as shown in a later-described embodiment, the uneven wall space and the clogging phenomenon may occur. Bending can be performed stably without generating cracks. The inflow and outflow of the filler for preventing the occurrence of the uneven thickness space and the clogging phenomenon of the double dry heat exchanger is performed easily in the state of water, so that the water can be reused.
【００１９】[0019]
【発明の実施の形態】以下、本発明の各種実施形態を図
例に基づいて説明をする。なお、前述例と同一部分につ
いては、同一図符号を付して、それらの説明の全部また
は一部を省略する。DESCRIPTION OF THE PREFERRED EMBODIMENTS Various embodiments of the present invention will be described below with reference to the drawings. The same parts as those in the above-described example are denoted by the same reference numerals, and all or part of the description thereof will be omitted.
【００２０】(1) 本発明の曲げ加工方法を適用する二重
管式熱交換器Ｈの一態様について、以下に、説明をす
る。(1) One embodiment of the double tube heat exchanger H to which the bending method of the present invention is applied will be described below.
【００２１】内管１２と外管１４とを備え、内管１２側
および外管１４側を、それぞれ、高温側流体通路および
低温側流体通路のいずれか一方づつとする二重管式熱交
換器Ｈである。図例では内管１２側が高温ガス流体通路
とされ、外管１４側が冷却水流体通路とされている。A double-pipe heat exchanger including an inner pipe 12 and an outer pipe 14, wherein the inner pipe 12 and the outer pipe 14 each have one of a high-temperature fluid path and a low-temperature fluid path. H. In the illustrated example, the inner pipe 12 side is a high-temperature gas fluid passage, and the outer pipe 14 side is a cooling water fluid passage.
【００２２】内管１２に、横断面放射状の波形チューブ
で形成された伝熱フィン２２が内管１２の管壁内側に接
して配されている。A heat transfer fin 22 formed of a corrugated tube having a radial cross section is disposed on the inner tube 12 in contact with the inner wall of the inner tube 12.
【００２３】ここで、伝熱フィン２２である波形チュー
ブは、通常、図６に示すような、熱伝導率が大きくバネ
性を有する金属製（例えば、鋼製）の金属波板２４を筒
状に曲げて、内管１２に挿入し、その後、蝋付けにより
固定して形成することが望ましい。蝋付け工程前の仮止
め作業が不要となるためである。勿論、波形チューブ
を、当初から引き抜き等により加工成形したものを、内
管１２に挿入して、固定してもよい。この場合は、波形
チューブは、内管に対して締まり嵌めとなるようにして
おくことが、上記と同様蝋付け工程前の仮止めが不要と
なり望ましい。ここで、波形チューブ２２の板厚は、材
質により異なるが、鋼製の場合、通常、０．０１〜０．
８mm、望ましくは、０．０５〜０．５mmとする。薄くし
すぎると、形態保持性とともに伝熱抵抗が大きくなり、
また、厚いと重量増大につながり望ましくない。Here, the corrugated tube, which is the heat transfer fin 22, is generally formed of a metal (for example, steel) metal corrugated plate 24 having a large thermal conductivity and a spring property as shown in FIG. It is desirable to bend and insert into the inner tube 12 and then fix it by brazing. This is because temporary fixing work before the brazing process is not required. Of course, a corrugated tube formed by drawing or the like from the beginning may be inserted into the inner tube 12 and fixed. In this case, it is desirable that the corrugated tube be tightly fitted to the inner tube because the temporary fixing before the brazing step is not required similarly to the above. Here, the plate thickness of the corrugated tube 22 varies depending on the material.
8 mm, preferably 0.05 to 0.5 mm. If it is too thin, heat transfer resistance will increase along with shape retention,
On the other hand, when the thickness is large, the weight increases, which is not desirable.
【００２４】また、内管１２の内半径ｒと波板２４の高
さＬとの関係は、内管１２の内径にもよるが、内管１２
の内径１０〜５０mmの範囲で、通常Ｌ／ｒ＝０．１〜
０．８、望ましくは、Ｌ／ｒ＝０．２〜０．７とする。
そして内径の範囲に対応して、波の山の高さはＬ＝４〜
２０mmとする。The relationship between the inner radius r of the inner tube 12 and the height L of the corrugated plate 24 depends on the inner diameter of the inner tube 12.
L / r = 0.1 to 10 to 50 mm
0.8, preferably L / r = 0.2 to 0.7.
And according to the range of the inner diameter, the height of the wave peak is L = 4 ~
20 mm.
【００２５】また、波形チューブ２２の波ピッチは、要
求伝熱面積に対応して２〜５mmとする。The wave pitch of the corrugated tube 22 is set to 2 to 5 mm according to the required heat transfer area.
【００２６】なお、波形チューブの形態は、波形の山・
谷がＲ状でなくても、山・谷が角ばっていてもよい。ま
た、長手方向で山を一定ピッチ毎にずらして形成した金
属製波板で形成したものを使用して形成してもよい。It should be noted that the shape of the corrugated tube may be
The valleys may not be R-shaped, but the peaks and valleys may be square. Alternatively, the ridges may be formed by using a metal corrugated plate in which the peaks are shifted at regular intervals in the longitudinal direction.
【００２７】また、内管１２の肉厚は、伝熱性の見地か
ら可及的に薄い方が望ましいが、波形チューブに比して
剛性が要求されるため、波形チューブより厚肉とする。
例えば、内管１２の内径が上記範囲の場合、通常０．１
〜１．０mm、望ましくは０．３〜０．８mmとする。The wall thickness of the inner tube 12 is desirably as thin as possible from the viewpoint of heat transfer. However, since the rigidity is required as compared with the corrugated tube, the inner tube 12 is made thicker than the corrugated tube.
For example, when the inner diameter of the inner tube 12 is within the above range, it is usually 0.1
To 1.0 mm, preferably 0.3 to 0.8 mm.
【００２８】外管１４と内管１２との隙間は、例えば、
内管１２の内径が上記範囲の場合、通常、１〜５mmの範
囲とする。The gap between the outer pipe 14 and the inner pipe 12 is, for example,
When the inner diameter of the inner tube 12 is in the above range, it is usually in the range of 1 to 5 mm.
【００２９】(2) 次に、上記態様の二重管式熱交換器Ｈ
の曲げ加工方法について、説明をする。即ち、図７に直
管状の状態から、図８に示す曲げ状態に、曲げ加工を行
う。このときの内側曲げ角度αが１５０°〜０°、望ま
しくは、１２０°〜０°とする。１５０°を越えるもの
については、充填材を入れなくても、閉塞等の現象が発
生し難く、本発明の曲げ加工方法を適用する必然性が低
い。なお、曲げ角度が０°（反転曲げ）の場合でも、曲
げＲを大きく採れば可、曲げ加工した場合、伝熱フィン
が偏肉空間ないし閉塞が発生することはない。なお、図
例では、曲げ部Ｃは１箇所であるが２箇所以上でもよく
（特に長尺の二重管式熱交換器の場合）、その場合、曲
げ方向も同一平面状にある必要はない。(2) Next, the double tube heat exchanger H of the above embodiment
Will be described. That is, the bending process is performed from the straight tubular state shown in FIG. 7 to the bent state shown in FIG. At this time, the inner bending angle α is set to 150 ° to 0 °, preferably, 120 ° to 0 °. In the case where the angle exceeds 150 °, phenomena such as clogging hardly occur even without a filler, and the necessity of applying the bending method of the present invention is low. Even when the bending angle is 0 ° (reversed bending), it is possible to adopt a large bending R. When the bending is performed, the heat transfer fins do not have uneven thickness spaces or blockages. In the illustrated example, the number of the bent portions C is one, but may be two or more (especially in the case of a long double-pipe heat exchanger). In that case, the bending directions need not be in the same plane. .
【００３０】まず、二重管式熱交換器Ｈの内管１２及び
外管１４の双方に水を充満させて流出不可に閉じる。具
体的には、出口ノズル１８を閉じて、入口ノズル１６か
ら、高温ガス流出口側を閉じて、高温ガス入口側のフラ
ンジ２０から、それぞれ水を充満させて、入口ノズル１
６及びフランジ２０を閉じる（図１参照）。First, both the inner pipe 12 and the outer pipe 14 of the double-pipe heat exchanger H are filled with water and closed so as not to flow out. Specifically, the outlet nozzle 18 is closed, the hot gas outlet side is closed from the inlet nozzle 16, and water is filled from the hot gas inlet side flange 20, respectively.
6 and the flange 20 are closed (see FIG. 1).
【００３１】このとき、二重管式熱交換器Ｈを横置きし
て、冷却する場合は、水の充満度は、内管１２側及び外
管１４側ともに、通常、９５〜９９．５％、望ましくは
９８〜９９％とする。多すぎると、破裂のおそれがあ
り。少なすぎると、曲げ加工する際に、閉塞ないし空間
偏肉が発生するおそれがある。At this time, when the double-pipe heat exchanger H is placed horizontally for cooling, the water filling degree is usually 95 to 99.5% for both the inner pipe 12 and the outer pipe 14. , Preferably 98 to 99%. If it is too large, it may burst. If the amount is too small, blockage or uneven wall thickness may occur during bending.
【００３２】なお、二重管式熱交換器Ｈを立て置きし
て、冷却する場合は、水の充満度は、立てた場合に、曲
げ加工部位を十分に越える量、通常、６０％以上、望ま
しくは８０％以上を充満させればよい。When the double-pipe heat exchanger H is set up and cooled, the degree of water filling is such that when it is set up, it is sufficient to exceed the bent portion, usually 60% or more. Desirably, 80% or more is filled.
【００３３】上記のように水を充満させた二重管式熱交
換器Ｈを、冷凍雰囲気におく。通常の、−２０℃程度に
冷やせる冷凍庫（冷凍室）でもよいが、加圧液体窒素
（１気圧での沸点：−１９５．８℃）等を用いて、氷の
目標設定温度が−４０℃前後となるように、−４０℃よ
り数十℃低い液体（冷媒）中に浸漬して、又は、それら
の冷媒を直接噴射して行うことが、急速冷凍できて望ま
しい。このとき、冷凍時間は、冷凍雰囲気温度により異
なるが、３０〜９０分、望ましくは、６０分前後とす
る。The double-tube heat exchanger H filled with water as described above is placed in a freezing atmosphere. A normal freezer (freezer) that can cool to about −20 ° C. may be used, but the target set temperature of ice is −40 ° C. using pressurized liquid nitrogen (boiling point at 1 atm: −195.8 ° C.) or the like. It is desirable to immerse in a liquid (refrigerant) lower than −40 ° C. by several tens of degrees C. or to directly inject such refrigerants so that the temperature can be changed back and forth so that rapid freezing can be performed. At this time, the freezing time varies depending on the freezing atmosphere temperature, but is set to 30 to 90 minutes, preferably around 60 minutes.
【００３４】そして、冷凍雰囲気から取り出した二重管
式熱交換器は、室温で、曲げ加工を行う。The double-pipe heat exchanger taken out of the frozen atmosphere is bent at room temperature.
【００３５】該曲げ加工の方式としては、図９に示すよ
うなドロー曲げ又は図１０に示すようなプレス曲げによ
り行う。The bending is performed by draw bending as shown in FIG. 9 or press bending as shown in FIG.
【００３６】ドロー曲げは、直管状の熱交換器Ｈの上面
を、固定型２６にガイドされて往復移動する移動押え型
２８で押えながら、回転押え型３０と、回転テーブル３
２で回動可能とされた締め付け型３４との間を、直管状
の熱交換器Ｈを引き抜いて行う。In the draw bending, the rotary presser 30 and the rotary table 3 are pressed while the upper surface of the heat exchanger H having a straight tube shape is pressed by the movable presser 28 that is reciprocated while being guided by the fixed mold 26.
The straight tube heat exchanger H is pulled out between the clamping die 34 that can be rotated in Step 2 and the operation.
【００３７】また、プレス曲げは、曲げ凹溝を備え得た
下型３６に直管状の熱交換器Ｈをセットした後、上型３
８をプレス（例えば５ton プレス）により下降させて行
う。In the press bending, a straight tubular heat exchanger H is set on the lower die 36 having a bent groove, and then the upper die 3 is set.
8 is lowered by a press (for example, a 5 ton press).
【００３８】この曲げ加工時には、少なくとも二重管式
熱交換器の曲げ予定部は、内管の伝熱フィン部も含めて
水が凍結状態、即ち、氷で充満されているため、二重管
式熱交換器が空間偏肉に閉塞状態で曲げ加工されること
はない。At the time of this bending, at least the portion to be bent of the double tube heat exchanger is in a frozen state, that is, filled with ice, including the heat transfer fins of the inner tube. The heat exchanger is not bent in a closed state due to uneven wall thickness.
【００３９】そして、上記加工後、所定時間が経過する
と、氷が解けて水となるため、冷却水入口や上記入口フ
ランジ部から容易に排出できる。この際、若干加熱し
て、氷解を促進させてもよい。After a predetermined time elapses after the above-mentioned processing, the ice melts and turns into water, so that it can be easily discharged from the cooling water inlet or the inlet flange. At this time, the ice may be slightly heated to accelerate the thawing.
【００４０】[0040]
【実施例】下記仕様の二重管式熱交換器の内管及び外管
にそれぞれ、水を略一杯入れて、閉じた状態で、液体窒
素（−１９０℃ ）中に６０分浸漬した。EXAMPLE An inner tube and an outer tube of a double-tube heat exchanger having the following specifications were each filled with almost full of water, and immersed in liquid nitrogen (-190 ° C.) for 60 minutes in a closed state.
【００４１】 仕様：外管…SUS304、肉厚０．８mmｔ、外径３１．８mmφ 内管…SUS304、肉厚１．０mmｔ、外径２１．７mmφ 伝熱フィン…SUS316L 、肉厚０．５mmｔ 山数７、山高さ５．４mm 当該冷凍後の熱交換器をプレス成形（５ton プレス）に
より、内側曲げ角度α＝１２０°となるような、曲げ加
工を行った。Specifications: Outer tube: SUS304, wall thickness 0.8 mmt, outer diameter 31.8 mmφ Inner tube: SUS304, wall thickness 1.0 mmt, outer diameter 21.7 mmφ Heat transfer fins: SUS316L, wall thickness 0.5 mmt 7. Peak height 5.4 mm The frozen heat exchanger was bent by press forming (5 ton press) so that the inner bending angle α = 120 °.
【００４２】そして、水を排出した後、曲げ部を切断し
て観察したが、内管と外管の間には勿論、伝熱フィンに
も偏肉空間や閉塞は発生していなかった。After the water was discharged, the bent portion was cut and observed. As a result, no uneven thickness space or blockage occurred in the heat transfer fin as well as between the inner tube and the outer tube.
【図１】従来の二重管式熱交換器を示す正面図FIG. 1 is a front view showing a conventional double tube heat exchanger.
【図２】図１の２−２線拡大断面図FIG. 2 is an enlarged sectional view taken along line 2-2 of FIG. 1;
【図３】従来の多管式熱交換器の一例を示す正面図FIG. 3 is a front view showing an example of a conventional multi-tube heat exchanger.
【図４】図３の４−４線断面図FIG. 4 is a sectional view taken along line 4-4 in FIG. 3;
【図５】図１において内管に波形チューブの伝熱フィン
を設けた図２に対応する拡大端面図FIG. 5 is an enlarged end view corresponding to FIG. 2 in which a heat transfer fin of a corrugated tube is provided on the inner tube in FIG. 1;
【図６】本発明の熱交換器に使用する金属波板の斜視図FIG. 6 is a perspective view of a metal corrugated sheet used in the heat exchanger of the present invention.
【図７】本発明を適用する直管状二重管式熱交換器の一
態様を示す斜視図FIG. 7 is a perspective view showing one embodiment of a straight tubular double tube heat exchanger to which the present invention is applied.
【図８】図７の二重管式熱交換器を曲げ加工した後の斜
視図8 is a perspective view of the double-pipe heat exchanger of FIG. 7 after being bent.
【図９】本発明の曲げ加工方法の一態様であるドロー曲
げを示す概略図FIG. 9 is a schematic view illustrating draw bending which is one embodiment of the bending method of the present invention.
【図１０】同じく他の態様であるプレス曲げを示す概略
図FIG. 10 is a schematic view showing press bending which is another embodiment.
１２ 内管 １４ 外管 ２２ 伝熱フィン ２４ 波板 Ｈ 二重管式熱交換器 Ｃ 二重管式熱交換器の曲げ部 12 Inner tube 14 Outer tube 22 Heat transfer fin 24 Corrugated sheet H Double tube heat exchanger C Bending portion of double tube heat exchanger
───────────────────────────────────────────────────── フロントページの続き (72)発明者 榊原 康文 愛知県名古屋市昭和区白金二丁目７番11号 マルヤス工業株式会社内 Ｆターム(参考） 3L103 AA01 BB17 CC02 CC27 DD04 DD33 DD38 4E063 AA07 BC06 JA04 KA20 MA17 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Yasufumi Sakakibara 2-11-11 Shirokane, Showa-ku, Nagoya-shi, Aichi F-term in Maruyasu Kogyo Co., Ltd. 3L103 AA01 BB17 CC02 CC27 DD04 DD33 DD38 4E063 AA07 BC06 JA04 KA20 MA17
Claims (3)
外管側に、それぞれ、高温側流体通路および低温側流体
通路のどちらか一方づつを備え、内管側に波形の伝熱フ
ィンが管壁に接して配されているものである二重管式熱
交換器を曲げ加工するに際して、 前記内管及び外管の双方に水を充満させて流出不可に閉
じて、該水を凍らさせて氷とした状態で、曲げ加工を行
った後、前記氷を解かして除去することを特徴とする二
重管式熱交換器の曲げ加工方法。An inner pipe and an outer pipe are provided on the inner pipe side and the outer pipe side, respectively. One of a high-temperature fluid passage and a low-temperature fluid passage is provided, and a waveform transmission is performed on the inner pipe side. When bending a double-pipe heat exchanger in which heat fins are arranged in contact with the pipe wall, both the inner pipe and the outer pipe are filled with water and closed so that they cannot flow out. A method of bending a double-pipe heat exchanger, comprising: performing bending in a state where ice is frozen to form ice and then melting and removing the ice.
１５０°〜０°であることを特徴とする請求項１記載の
二重管式熱交換器の曲げ加工方法。2. The bending method for a double-pipe heat exchanger according to claim 1, wherein the inside bending angle of the double-pipe heat exchanger is 150 ° to 0 °.
げにより行うことを特徴とする請求項１又は２記載の二
重管式熱交換器の曲げ加工方法。3. The bending method for a double-pipe heat exchanger according to claim 1, wherein the bending is performed by draw bending or press bending.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25168998A JP3919354B2 (en) | 1998-09-07 | 1998-09-07 | Bending method of double tube heat exchanger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25168998A JP3919354B2 (en) | 1998-09-07 | 1998-09-07 | Bending method of double tube heat exchanger |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000079417A true JP2000079417A (en) | 2000-03-21 |
| JP3919354B2 JP3919354B2 (en) | 2007-05-23 |
Family
ID=17226554
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25168998A Expired - Fee Related JP3919354B2 (en) | 1998-09-07 | 1998-09-07 | Bending method of double tube heat exchanger |
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| Country | Link |
|---|---|
| JP (1) | JP3919354B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110170806A (en) * | 2019-06-18 | 2019-08-27 | 江苏福莱斯伯汽车零件制造有限公司 | EGR cooling cycle pipe and its processing technology |
| CN112964096A (en) * | 2021-02-15 | 2021-06-15 | 姜黎平 | Anti-freezing type sleeve heat exchanger |
| CN114657360A (en) * | 2021-11-03 | 2022-06-24 | 航天晨光股份有限公司 | Rapid controllable cooling method for S-shaped stainless steel corrugated pipe |
-
1998
- 1998-09-07 JP JP25168998A patent/JP3919354B2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110170806A (en) * | 2019-06-18 | 2019-08-27 | 江苏福莱斯伯汽车零件制造有限公司 | EGR cooling cycle pipe and its processing technology |
| CN112964096A (en) * | 2021-02-15 | 2021-06-15 | 姜黎平 | Anti-freezing type sleeve heat exchanger |
| CN114657360A (en) * | 2021-11-03 | 2022-06-24 | 航天晨光股份有限公司 | Rapid controllable cooling method for S-shaped stainless steel corrugated pipe |
| CN114657360B (en) * | 2021-11-03 | 2023-08-15 | 航天晨光股份有限公司 | Rapid controllable cooling method for S-shaped stainless steel corrugated pipe |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3919354B2 (en) | 2007-05-23 |
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