JP2004093037A - Double-pipe heat exchanger - Google Patents

Double-pipe heat exchanger Download PDF

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Publication number
JP2004093037A
JP2004093037A JP2002256182A JP2002256182A JP2004093037A JP 2004093037 A JP2004093037 A JP 2004093037A JP 2002256182 A JP2002256182 A JP 2002256182A JP 2002256182 A JP2002256182 A JP 2002256182A JP 2004093037 A JP2004093037 A JP 2004093037A
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Prior art keywords
diameter pipe
pipe
water
small
heat exchanger
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Japanese (ja)
Inventor
Tatsuya Kikuyama
菊山　辰也
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Toyo Radiator Co Ltd
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Toyo Radiator Co Ltd
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Priority to JP2002256182A priority Critical patent/JP2004093037A/en
Publication of JP2004093037A publication Critical patent/JP2004093037A/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
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D2021/0019—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
    • F28D2021/0068—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for refrigerant cycles
    • F28D2021/0073—Gas coolers

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Details Of Fluid Heaters (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat exchanger hardly generating clogging caused by water scale in a water flow passage, concerning a double-pipe heat exchanger wherein a coolant flows in a small diameter pipe and water flows in a large diameter pipe, such as a water heater using high-temperature and high-pressure CO<SB>2</SB>gas as the coolant. <P>SOLUTION: The small diameter pipe (1) and the large diameter pipe (2) are arranged coaxially through a gap on a straight line part of an axis, and the axis of the small diameter pipe (1) is bent meanderingly. In this heat exchanger wherein a heating fluid (3) flows in the small diameter pipe (1) and water (4) to be heated flows in the large diameter pipe (2), a passage sectional area of the water (4) between the small diameter pipe (1) and the large diameter pipe (2) is formed larger on the downstream side where the water (4) flows than on the upstream side. The passage sectional area of the water between the small diameter pipe and the large diameter pipe is formed larger on the downstream side where the water flows than on the upstream side. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
本発明は、ヒートホンプ式給湯器や空調器等に使用される冷媒と水との熱交換を行う二重管型熱交換器において、水側流路中に水スケールによる管詰まりが生じるのを防止するものに関する。
【０００２】
【従来の技術】
図１１は、加熱用流体３としてＣＯ２　ガスを用いた冷凍サイクルの給湯用熱交換器１３である。即ち、吸熱器１７と圧縮器１６と放熱器と膨張弁１８との間をＣＯ２　ガスが流通する。そして放熱器を給湯用熱交換器１３とし、ＣＯ２　ガスパイプ１５に高温高圧の冷媒が流通し、水パイプ１４に水４が供給され、両者の間に熱交換を行うものである。
このような給湯用熱交換器（放熱器）１３で二重管型のものは、特開昭６０−２４８９９６号の熱交換器が知られている。この熱交換器は冷媒が流通する小径管を蛇行状に形成し、その小径管の直線部外周に大径の水パイプを被嵌すると共に、各水パイプ間を連結したものである。
【０００３】
【発明が解決しようとする課題】
従来の二重管型給湯用熱交換器（放熱器）１３は、水パイプの下流側において水スケールが付着し、次第に目詰まりを起こす欠点があった。これを防ぐには、水パイプ全体の直径をより大きくすることが考えられる。ところが、水パイプ全体の直径をより大きくし、その内部に流通する冷媒パイプの直径を同一とすれば、両者間の熱交換性能が低下するという別の問題が生じる。
そこで本発明は熱交換性能を維持しつつ、内部に水スケールが生じ難い二重管型熱交換器を提供することを課題とする。
【０００４】
【課題を解決するための手段】
請求項１に記載の本発明は、軸線の直線部で、小径管（１）　と大径管（２）　とが隙間を介して同軸に配置され、小径管（１）　の軸線が蛇行状に曲折され、
小径管（１）　に加熱用流体（３）　が流通すると共に、大径管（２）　に被加熱用の水（４）　が流通する熱交換器において、
小径管（１）　と大径管（２）　との間の水（４）　の流路断面積は、前記水（４）　の流通する下流側が上流側より大に形成されたことを特徴とする二重管型熱交換器である。
【０００５】
請求項２に記載の本発明は、請求項１において、
前記小径管（１）　の軸線の直線部で、小径管（１）　の外周に中間径管（５）　が密着して被嵌され、その中間径管（５）　の外周に、その中間径管（５）　の両端を除いて、前記大径管（２）　が隙間を介して被嵌され、
その大径管（２）　の両端と中間径管（５）　の外周とが液密に閉塞された二重管型熱交換器である。
【０００６】
請求項３に記載の本発明は、請求項１または請求項２において、
前記大径管（２）　と、小径管（１）　との隙間にインナーフィン（６）　が介装された二重管型熱交換器である。
請求項４に記載の本発明は、請求項１または請求項２において、
前記大径管（２）　の外周に、互いに離間して多数の攪拌用の小凹部（７）　が内面側に曲折形成された二重管型熱交換器である。
【０００７】
【発明の実施の形態】
次に、図面に基づいて本発明の実施の形態につき説明する。
図１は本発明の二重管型熱交換器の第１の実施の形態を示し、図２は図１のＩＩ−ＩＩ矢視断面略図である。
この二重管型熱交換器は、一例として給湯器として用いるものである。
この熱交換器は蛇行状に曲折された小径管１と、小径管１の直線部に隙間を開けて同軸に被嵌された大径管２とを有する。大径管２の両端部は閉塞され、小径管１の外周に液密に固定されている。小径管１は、この例ではＵ字状に曲げたパイプと直線状のパイプとそれらの端部間を連結する短い連結用Ｕ字管１２とを有する。
【０００８】
次に、大径管２は夫々互いに水連結管８によって連結され、最も下流側に位置する大径管２のみの内直径が、他の大径管２の内直径よりも大に形成されている。そして最も上流側の大径管２に入口パイプ９が連通され、最も下流側の大径管２に出口パイプ１０か連通されている。そして上流側の入口パイプ９から水４が流入し、水連結管８を介して下流側の大径管２と小径管１との隙間を長手方向に流通し、最下流の大径管２の出口パイプ１０から外部に導かれる。
【０００９】
また、小径管１には水４の流通する最下流側から高温高圧のＣＯ２　ガス等からなる加熱用流体３が流入し、水４の流通する最も上流側からそれが流出する。そして加熱用流体３と水４との間に熱交換が行われる。このとき水４は上流側から下流側に流通するに従って次第に高温になり、最下流の大径管２では一例として８０℃程度に加熱される。
すると、最下流側の大径管２では水酸化カルシウム等の溶解度が低下し、それが析出して大径管２内部に付着し易くなる。しかしながら、最下流側の大径管２の直径は、それ以外の部分の直径よりも大に形成されているから、それらは内部を円滑に流通し目詰まりを起こすことが少ない。さらに大径管２の内直径自体が大に形成されているから、多少の水スケールの付着が内面に存在しても、目詰まりを起こすことがない。
【００１０】
次に、図３及び図４は本発明の他の実施の形態を示し、この例が図１のそれと異なる点は、小径管１の直線部に中間径管５が密着して被嵌され、その中間径管５の外周に大径管２が被嵌されたものである。即ち、小径管１の直線部において内面に多数の溝１１を有する中間径管５が被嵌され、その状態で小径管１の内面側を拡開することにより、小径管１の外周と中間径管５の内周とを密着固定する。次に、中間径管５の長さよりも短い大径管２を中間径管５の外周に被嵌し、大径管２の両端部と中間径管５の外周との間を閉塞したものである。
このように中間径管５を介して大径管２を被嵌することにより、仮に小径管１に亀裂等が生じても、水４に加熱用流体３が混入するおそれを防止できる。
【００１１】
次に、図５及び図６は本発明の第３の実施の形態であり、図５はその一部破断説明図、図６は図５のＶＩ−ＶＩ矢視断面略図である。
この例が図３及び図４のそれと異なる点は、中間径管５と大径管２との間にインナーフィン６を介装したことである。このようにすることにより、水４側の伝熱面積を増大させ、熱交換を促進する効果がある。
次に、図７は本発明の第４の実施の形態を示し、この例が図５のそれと異なる点は、中間径管５が存在しないことである。
【００１２】
次に、図８は本発明の第５の実施の形態を示し、この例は図１の例において、大径管２の外周に互いに離間し多数の小凹部７をその内面に曲折し、その小凹部７の先端と小径管１とを接触または近接させたものである。このようにすることにより、水４を大径管２の内部で攪拌し熱交換を促進し得る。また、小凹部７により小径管１を大径管２の中心に位置することができ、両者の軸線を一致させて各部の熱交換性能のバラツキを無くし、全体として熱交換性能を向上できる。
【００１３】
次に、図９及び図１０は本発明のさらに他の実施の形態を示し、この例が図８のそれと異なる点は、大径管２と小径管１との間に中間径管５を介装したことである。
なお、本発明は前記した給湯器以外に空調用の凝縮器として用いることもできる。この場合は、高温高圧の冷媒を水によって凝縮する部分に用いられる。
【００１４】
【発明の作用・効果】
本発明の二重管型熱交換器は、大径管２に被加熱用の水４が流通する熱交換器において、小径管１と大径管２との間の水４の流路断面積は、水４の流通する下流側が上流側のそれより大に形成されているものである。そのため、水の温度上昇と共に溶解度が減少する水酸化カルシウム等の物質が内面に析出し易い下流側において、水の流路断面積を大きくしたので、水スケールの付着による管詰まりを防止できる。
しかも水４の上流側の大径管２の流路断面積は小に形成されているから、その水４と加熱用流体３との熱交換が促進される。
【図面の簡単な説明】
【図１】本発明の第１の実施の形態を示す二重管型熱交換器の一部破断説明図。
【図２】図１のＩＩ−ＩＩ矢視断面略図。
【図３】同第２の実施の形態を示す二重管型熱交換器の一部破断説明図。
【図４】図３のＩＶ−ＩＶ矢視断面略図。
【図５】本発明の第３の実施の形態を示す二重管型熱交換器の一部破断説明図。
【図６】図５のＶＩ−ＶＩ矢視断面略図。
【図７】本発明の第４の実施の形態を示す二重管型熱交換器の一部破断説明図。
【図８】本発明の第５の実施の形態を示す二重管型熱交換器の要部破断説明図。
【図９】本発明の第６の実施の形態を示す二重管型熱交換器の要部破断説明図。
【図１０】図９のＸ−Ｘ矢視断面略図。
【図１１】給湯用熱交換器としてＣＯ２　ガスを用いた冷凍サイクルの説明図。
【符号の説明】
１　小径管
２　大径管
３　加熱用流体
４　水
５　中間径管
６　インナーフィン
７　小凹部
８　水連結管
９　入口パイプ
１０　出口パイプ
１１　　溝
１２　　連結用Ｕ字管
１３　　給湯用熱交換器（放熱器）
１４　　水パイプ
１５　　ＣＯ２　ガスパイプ
１６　　圧縮器
１７　　吸熱器
１８　　膨張弁
１９　　ファン[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention, in a double-pipe heat exchanger that exchanges heat between water and a refrigerant used in a heat pump water heater or an air conditioner, prevents pipe clogging due to water scale in a water-side flow path. About what you do.
[0002]
[Prior art]
FIG. 11 is a hot-water supply heat exchanger 13 of a refrigeration cycle using CO 2 gas as the heating fluid 3. That is, CO 2 gas flows between the heat absorber 17, the compressor 16, the radiator, and the expansion valve 18. The heat radiator is a heat exchanger 13 for hot water supply, a high-temperature and high-pressure refrigerant flows through the CO 2 gas pipe 15, and water 4 is supplied to the water pipe 14, thereby performing heat exchange between the two.
As such a heat exchanger (heat radiator) 13 for hot water supply, a double-pipe type heat exchanger is known from Japanese Patent Application Laid-Open No. 60-248996. In this heat exchanger, a small-diameter pipe through which a refrigerant flows is formed in a meandering shape, and a large-diameter water pipe is fitted around the outer periphery of a straight portion of the small-diameter pipe, and the respective water pipes are connected.
[0003]
[Problems to be solved by the invention]
The conventional double-pipe hot water supply heat exchanger (radiator) 13 has a drawback that water scale adheres downstream of the water pipe and gradually causes clogging. To prevent this, it is conceivable to increase the diameter of the entire water pipe. However, if the diameter of the entire water pipe is made larger and the diameter of the refrigerant pipe flowing inside the water pipe is made the same, another problem arises in that the heat exchange performance between the two is reduced.
Therefore, an object of the present invention is to provide a double-pipe heat exchanger in which water scale hardly occurs inside while maintaining heat exchange performance.
[0004]
[Means for Solving the Problems]
According to the first aspect of the present invention, the small-diameter pipe (1) and the large-diameter pipe (2) are arranged coaxially with a gap therebetween in a linear portion of the axis, and the axis of the small-diameter pipe (1) is meandering. Bent,
In the heat exchanger in which the heating fluid (3) flows through the small-diameter pipe (1) and the water (4) to be heated flows through the large-diameter pipe (2),
The flow path cross-sectional area of the water (4) between the small-diameter pipe (1) and the large-diameter pipe (2) is characterized in that the downstream side where the water (4) flows is formed larger than the upstream side. It is a double tube heat exchanger.
[0005]
The present invention described in claim 2 is based on claim 1,
An intermediate-diameter pipe (5) is closely fitted on the outer periphery of the small-diameter pipe (1) at the linear portion of the axis of the small-diameter pipe (1), and the intermediate-diameter pipe (5) is fitted on the outer circumference of the intermediate-diameter pipe (5). Except for both ends of (5), the large-diameter pipe (2) is fitted through a gap,
This is a double-pipe heat exchanger in which both ends of the large-diameter pipe (2) and the outer periphery of the intermediate-diameter pipe (5) are closed in a liquid-tight manner.
[0006]
According to a third aspect of the present invention, in the first or second aspect,
This is a double-pipe heat exchanger in which an inner fin (6) is interposed in a gap between the large-diameter pipe (2) and the small-diameter pipe (1).
The present invention described in claim 4 is based on claim 1 or claim 2,
A double-pipe heat exchanger in which a large number of small recesses (7) for stirring are formed on the inner surface of the large-diameter pipe (2) so as to be spaced apart from each other.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 shows a first embodiment of a double-pipe heat exchanger of the present invention, and FIG. 2 is a schematic sectional view taken along the line II-II of FIG.
The double-pipe heat exchanger is used as a water heater, for example.
This heat exchanger has a small-diameter tube 1 bent in a meandering shape, and a large-diameter tube 2 coaxially fitted with a gap in a linear portion of the small-diameter tube 1. Both ends of the large-diameter pipe 2 are closed, and are fixed to the outer periphery of the small-diameter pipe 1 in a liquid-tight manner. In this example, the small-diameter pipe 1 includes a pipe bent in a U-shape, a straight pipe, and a short connecting U-shaped pipe 12 connecting between the ends thereof.
[0008]
Next, the large-diameter pipes 2 are connected to each other by a water connecting pipe 8, and the inner diameter of only the large-diameter pipe 2 located at the most downstream side is formed to be larger than the inner diameter of the other large-diameter pipes 2. I have. An inlet pipe 9 communicates with the most upstream large diameter pipe 2, and an outlet pipe 10 communicates with the most downstream large diameter pipe 2. Then, water 4 flows in from the upstream inlet pipe 9, flows in the gap between the large-diameter pipe 2 and the small-diameter pipe 1 on the downstream side through the water connection pipe 8 in the longitudinal direction, and flows into the downstream most large-diameter pipe 2. It is led to the outside from the outlet pipe 10.
[0009]
The heating fluid 3 made of high-temperature and high-pressure CO 2 gas flows into the small-diameter pipe 1 from the most downstream side where the water 4 flows, and flows out from the most upstream side where the water 4 flows. Then, heat exchange is performed between the heating fluid 3 and the water 4. At this time, the temperature of the water 4 gradually increases as the water 4 flows from the upstream side to the downstream side, and is heated to about 80 ° C. in the most downstream large-diameter pipe 2 as an example.
Then, the solubility of calcium hydroxide or the like in the large-diameter tube 2 on the most downstream side is reduced, and it is likely to precipitate and adhere to the inside of the large-diameter tube 2. However, since the diameter of the large-diameter pipe 2 on the most downstream side is formed larger than the diameter of the other parts, they flow smoothly inside and rarely cause clogging. Further, since the inner diameter of the large-diameter tube 2 is formed to be large, even if some water scale adheres to the inner surface, clogging does not occur.
[0010]
Next, FIGS. 3 and 4 show another embodiment of the present invention. This example is different from that of FIG. 1 in that the intermediate diameter pipe 5 is closely fitted to the straight portion of the small diameter pipe 1 and fitted. The large diameter pipe 2 is fitted on the outer periphery of the intermediate diameter pipe 5. That is, the intermediate diameter pipe 5 having a large number of grooves 11 is fitted on the inner surface in the straight portion of the small diameter pipe 1, and the inner surface of the small diameter pipe 1 is expanded in this state, so that the outer circumference and the intermediate diameter of the small diameter pipe 1 are expanded. The inner circumference of the tube 5 is tightly fixed. Next, the large-diameter pipe 2 shorter than the length of the intermediate-diameter pipe 5 is fitted on the outer circumference of the intermediate-diameter pipe 5, and the space between both ends of the large-diameter pipe 2 and the outer circumference of the intermediate-diameter pipe 5 is closed. is there.
By fitting the large-diameter pipe 2 through the intermediate-diameter pipe 5 in this manner, even if the small-diameter pipe 1 is cracked, the possibility that the heating fluid 3 is mixed into the water 4 can be prevented.
[0011]
Next, FIGS. 5 and 6 show a third embodiment of the present invention. FIG. 5 is a partially cutaway explanatory view, and FIG. 6 is a schematic sectional view taken along the line VI-VI of FIG.
This example differs from those of FIGS. 3 and 4 in that an inner fin 6 is interposed between the intermediate diameter pipe 5 and the large diameter pipe 2. This has the effect of increasing the heat transfer area on the water 4 side and promoting heat exchange.
Next, FIG. 7 shows a fourth embodiment of the present invention. This example differs from that of FIG. 5 in that the intermediate diameter tube 5 is not present.
[0012]
Next, FIG. 8 shows a fifth embodiment of the present invention. This example is different from the example of FIG. 1 in that a large number of small concave portions 7 are separated from each other on the outer periphery of the large-diameter tube 2 and bent into the inner surface thereof. The tip of the small concave portion 7 is brought into contact with or close to the small diameter tube 1. By doing so, the water 4 can be stirred inside the large-diameter tube 2 to promote heat exchange. In addition, the small-diameter tube 7 can position the small-diameter tube 1 at the center of the large-diameter tube 2 so that the axes of the small-diameter tube 1 are aligned with each other, thereby eliminating the variation in the heat exchange performance of each part and improving the heat exchange performance as a whole.
[0013]
Next, FIGS. 9 and 10 show still another embodiment of the present invention. This embodiment is different from that of FIG. 8 in that an intermediate diameter pipe 5 is provided between a large diameter pipe 2 and a small diameter pipe 1. It was wearing.
The present invention can be used as a condenser for air conditioning other than the above-described water heater. In this case, it is used in a portion where the high-temperature and high-pressure refrigerant is condensed by water.
[0014]
[Action and Effect of the Invention]
The double-pipe heat exchanger of the present invention is a heat exchanger in which water 4 to be heated flows through the large-diameter pipe 2, and the flow cross-sectional area of the water 4 between the small-diameter pipe 1 and the large-diameter pipe 2. Is formed such that the downstream side through which the water 4 flows is larger than that on the upstream side. Therefore, the flow path cross-sectional area of the water is increased on the downstream side where a substance such as calcium hydroxide, whose solubility decreases as the temperature of the water increases, tends to precipitate on the inner surface.
Moreover, since the cross-sectional area of the large-diameter pipe 2 on the upstream side of the water 4 is formed small, heat exchange between the water 4 and the heating fluid 3 is promoted.
[Brief description of the drawings]
FIG. 1 is a partially cutaway explanatory view of a double-pipe heat exchanger according to a first embodiment of the present invention.
FIG. 2 is a schematic sectional view taken along the line II-II of FIG.
FIG. 3 is a partially broken explanatory view of the double-pipe heat exchanger according to the second embodiment.
FIG. 4 is a schematic cross-sectional view taken along the line IV-IV in FIG. 3;
FIG. 5 is a partially cutaway explanatory view of a double-pipe heat exchanger according to a third embodiment of the present invention.
6 is a schematic sectional view taken along the line VI-VI in FIG. 5;
FIG. 7 is a partially cutaway explanatory view of a double-pipe heat exchanger showing a fourth embodiment of the present invention.
FIG. 8 is a fragmentary explanatory diagram of a main part of a double-pipe heat exchanger showing a fifth embodiment of the present invention.
FIG. 9 is a fragmentary explanatory diagram of a main part of a double-pipe heat exchanger showing a sixth embodiment of the present invention.
FIG. 10 is a schematic sectional view taken along the line XX of FIG. 9;
FIG. 11 is an explanatory diagram of a refrigeration cycle using CO 2 gas as a heat exchanger for hot water supply.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Small-diameter pipe 2 Large-diameter pipe 3 Heating fluid 4 Water 5 Intermediate-diameter pipe 6 Inner fin 7 Small recess 8 Water connection pipe 9 Inlet pipe 10 Outlet pipe 11 Groove 12 Connection U-shaped pipe 13 Hot water supply heat exchanger (radiator )
14 Water pipe 15 CO 2 gas pipe 16 Compressor 17 Heat absorber 18 Expansion valve 19 Fan

Claims (4)

軸線の直線部で、小径管（１）　と大径管（２）　とが隙間を介して同軸に配置され、小径管（１）　の軸線が蛇行状に曲折され、
小径管（１）　に加熱用流体（３）　が流通すると共に、大径管（２）　に被加熱用の水（４）　が流通する熱交換器において、
小径管（１）　と大径管（２）　との間の水（４）　の流路断面積は、前記水（４）　の流通する下流側が上流側より大に形成されたことを特徴とする二重管型熱交換器。The small-diameter pipe (1) and the large-diameter pipe (2) are arranged coaxially through a gap in the straight line portion of the axis, and the axis of the small-diameter pipe (1) is bent in a meandering manner.
In the heat exchanger in which the heating fluid (3) flows through the small-diameter pipe (1) and the water (4) to be heated flows through the large-diameter pipe (2),
The flow path cross-sectional area of the water (4) between the small-diameter pipe (1) and the large-diameter pipe (2) is characterized in that the downstream side where the water (4) flows is formed larger than the upstream side. Double tube heat exchanger. 請求項１において、
前記小径管（１）　の軸線の直線部で、小径管（１）　の外周に中間径管（５）　が密着して被嵌され、その中間径管（５）　の外周に、その中間径管（５）　の両端を除いて、前記大径管（２）　が隙間を介して被嵌され、
その大径管（２）　の両端と中間径管（５）　の外周とが液密に閉塞された二重管型熱交換器。In claim 1,
An intermediate-diameter pipe (5) is closely fitted on the outer periphery of the small-diameter pipe (1) at the linear portion of the axis of the small-diameter pipe (1), and the intermediate-diameter pipe (5) is fitted on the outer circumference of the intermediate-diameter pipe (5). Except for both ends of (5), the large-diameter pipe (2) is fitted through a gap,
A double-pipe heat exchanger in which both ends of the large-diameter pipe (2) and the outer periphery of the intermediate-diameter pipe (5) are closed in a liquid-tight manner. 請求項１または請求項２において、
前記大径管（２）　と、小径管（１）　との隙間にインナーフィン（６）　が介装された二重管型熱交換器。In claim 1 or claim 2,
A double-pipe heat exchanger in which an inner fin (6) is interposed in a gap between the large-diameter pipe (2) and the small-diameter pipe (1). 請求項１または請求項２において、
前記大径管（２）　の外周に、互いに離間して多数の攪拌用の小凹部（７）　が内面側に曲折形成された二重管型熱交換器。In claim 1 or claim 2,
A double-pipe heat exchanger in which a large number of small recesses (7) for stirring are formed on the outer surface of the large-diameter pipe (2) so as to be spaced apart from each other.
JP2002256182A 2002-08-30 2002-08-30 Double-pipe heat exchanger Pending JP2004093037A (en)

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Cited By (13)

* Cited by examiner, † Cited by third party
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JP2006078002A (en) * 2004-09-07 2006-03-23 Matsushita Electric Ind Co Ltd Heat exchanger
JP2006145056A (en) * 2004-11-16 2006-06-08 Matsushita Electric Ind Co Ltd Heat exchanger
JP2006336988A (en) * 2005-06-06 2006-12-14 Matsushita Electric Ind Co Ltd Heat exchanger apparatus and heat pump water heater using it
WO2007022777A1 (en) * 2005-08-25 2007-03-01 Knudsen Køling A/S A heat exchanger
CN100451527C (en) * 2007-06-19 2009-01-14 张伟 Double-drwn counter-current heat exchanger
JP2009008364A (en) * 2007-06-29 2009-01-15 Mitsubishi Electric Corp Heat pump water heater
WO2010052887A1 (en) * 2008-11-05 2010-05-14 サンデン株式会社 Heat exchanger and hot-water supply device using same
KR101159532B1 (en) 2010-05-26 2012-06-25 주식회사 일진이플러스 double typic heat exchanger
CN102759286A (en) * 2011-04-26 2012-10-31 上海数据港投资有限公司 Dual-tank cool storage type water-water exchanger
KR101218653B1 (en) * 2011-02-10 2013-01-04 신봉재 Freezing, Refrigerating and Cooling Device Using Antifreezing Solution
CN103363581A (en) * 2013-07-17 2013-10-23 枣庄福源印染机械有限公司 Three-channel turbulence self-cleaning internal-pressure-reducing pipeline water radiating and heat-exchanging device
KR101350349B1 (en) * 2013-09-25 2014-01-13 (주)보영테크 Double pipe of semiconductor manufacturing process
WO2014091558A1 (en) * 2012-12-11 2014-06-19 三菱電機株式会社 Double-pipe heat exchanger and refrigeration cycle device

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006078002A (en) * 2004-09-07 2006-03-23 Matsushita Electric Ind Co Ltd Heat exchanger
JP4552567B2 (en) * 2004-09-07 2010-09-29 パナソニック株式会社 Heat exchanger
JP4572662B2 (en) * 2004-11-16 2010-11-04 パナソニック株式会社 Heat exchanger
JP2006145056A (en) * 2004-11-16 2006-06-08 Matsushita Electric Ind Co Ltd Heat exchanger
JP2006336988A (en) * 2005-06-06 2006-12-14 Matsushita Electric Ind Co Ltd Heat exchanger apparatus and heat pump water heater using it
WO2007022777A1 (en) * 2005-08-25 2007-03-01 Knudsen Køling A/S A heat exchanger
CN100451527C (en) * 2007-06-19 2009-01-14 张伟 Double-drwn counter-current heat exchanger
JP2009008364A (en) * 2007-06-29 2009-01-15 Mitsubishi Electric Corp Heat pump water heater
WO2010052887A1 (en) * 2008-11-05 2010-05-14 サンデン株式会社 Heat exchanger and hot-water supply device using same
KR101159532B1 (en) 2010-05-26 2012-06-25 주식회사 일진이플러스 double typic heat exchanger
KR101218653B1 (en) * 2011-02-10 2013-01-04 신봉재 Freezing, Refrigerating and Cooling Device Using Antifreezing Solution
CN102759286A (en) * 2011-04-26 2012-10-31 上海数据港投资有限公司 Dual-tank cool storage type water-water exchanger
WO2014091558A1 (en) * 2012-12-11 2014-06-19 三菱電機株式会社 Double-pipe heat exchanger and refrigeration cycle device
CN103363581A (en) * 2013-07-17 2013-10-23 枣庄福源印染机械有限公司 Three-channel turbulence self-cleaning internal-pressure-reducing pipeline water radiating and heat-exchanging device
KR101350349B1 (en) * 2013-09-25 2014-01-13 (주)보영테크 Double pipe of semiconductor manufacturing process

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