JPH07190663A - Heating tube - Google Patents
Heating tubeInfo
- Publication number
- JPH07190663A JPH07190663A JP8961794A JP8961794A JPH07190663A JP H07190663 A JPH07190663 A JP H07190663A JP 8961794 A JP8961794 A JP 8961794A JP 8961794 A JP8961794 A JP 8961794A JP H07190663 A JPH07190663 A JP H07190663A
- Authority
- JP
- Japan
- Prior art keywords
- protrusion
- heat transfer
- slit
- length direction
- pipe
- 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.)
- Pending
Links
- 238000010438 heat treatment Methods 0.000 title abstract 3
- 239000007788 liquid Substances 0.000 abstract description 13
- 238000009835 boiling Methods 0.000 abstract description 10
- 239000012530 fluid Substances 0.000 abstract description 8
- 239000003507 refrigerant Substances 0.000 description 19
- 238000001704 evaporation Methods 0.000 description 4
- 230000008020 evaporation Effects 0.000 description 4
- 230000005494 condensation Effects 0.000 description 3
- 238000009833 condensation Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000002184 metal Substances 0.000 description 2
- 230000001154 acute effect Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
Classifications
-
- 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
- F28F1/40—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only inside the tubular element
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Geometry (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、熱交換器等に用いられ
る伝熱管に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat transfer tube used for a heat exchanger or the like.
【０００２】[0002]
【従来の技術】従来の伝熱管としては、図４及び図５に
示すように、伝熱管０１内面に複数条の螺旋状の台形の
突起０２を形成してこれら突起０２間に螺旋状の溝を形
成し、管内に冷媒を流すようにしたものが知られてい
る。この従来の内面螺旋溝付きの伝熱管は、溝による内
表面積の増大による伝熱性能向上、冷媒凝縮時は液膜の
薄膜化及び液排出速度の増大による凝縮熱伝達率の向
上、冷媒蒸発（沸騰）時は螺旋状の溝により冷媒０３が
水平管の上面まで供給されることによる蒸発熱伝達率の
向上を図ることができ、伝熱性能を向上させている。2. Description of the Related Art As a conventional heat transfer tube, as shown in FIGS. 4 and 5, a plurality of spiral trapezoidal projections 02 are formed on the inner surface of the heat transfer tube 01, and a spiral groove is formed between the projections 02. It is known that a refrigerant is formed and a refrigerant is caused to flow in the tube. This conventional heat transfer tube with an inner spiral groove improves heat transfer performance by increasing the inner surface area by the groove, improves the condensation heat transfer coefficient by thinning the liquid film when the refrigerant is condensed, and increases the liquid discharge speed, and refrigerant evaporation ( At the time of boiling, the refrigerant 03 is supplied to the upper surface of the horizontal tube by the spiral groove, so that the evaporation heat transfer rate can be improved and the heat transfer performance is improved.
【０００３】[0003]
【発明が解決しようとする課題】前記の従来の伝熱管の
場合、冷媒凝縮時には、濃縮液が螺旋溝によって管上面
まで導かれて内面全体を凝縮液膜で覆ってしまうため、
冷媒のガス部分と管内面が接触しにくくなり、熱伝達率
が抑制されることになる。また、蒸発（沸騰）時には、
螺旋状の溝に沿って冷媒は流れるが、重力の影響を受け
るため、管上面に引き上げられる冷媒液の量が少なくな
り、管の下部に液の量が多くなり溝を覆ってしまうため
必ずしも十分な熱伝達性能が得られていないという問題
点が生じていた。In the case of the above conventional heat transfer tube, when the refrigerant is condensed, the concentrated liquid is guided to the upper surface of the tube by the spiral groove and the entire inner surface is covered with the condensed liquid film.
It becomes difficult for the gas portion of the refrigerant to come into contact with the inner surface of the pipe, and the heat transfer coefficient is suppressed. Also, at the time of evaporation (boiling),
The refrigerant flows along the spiral groove, but because of the influence of gravity, the amount of refrigerant liquid pulled up to the upper surface of the pipe is small, and the amount of liquid at the lower part of the pipe is large and covers the groove. There has been a problem in that excellent heat transfer performance is not obtained.
【０００４】本発明は、前記問題点を解決することがで
きる伝熱管を提供しようとするものである。The present invention is intended to provide a heat transfer tube which can solve the above problems.
【０００５】[0005]
（１）本発明は、内面に複数条の螺旋状の突起を形成し
てなる伝熱管において、前記突起の高さ方向に段部を形
成し、同段部に突起の長さ方向に沿ってスリットを形成
してなることを特徴とする。 （２）前記（１）の伝熱管において、前記突起の頂部に
突起の長さ方向に沿ってスリットを形成してなることを
特徴とする。 （３）また、前記（１）の伝熱管において、前記突起の
頂部に突起の長さ方向と交わる方向のスリットを形成し
てなることを特徴とする。(1) According to the present invention, in a heat transfer tube having a plurality of helical protrusions formed on the inner surface thereof, a step portion is formed in the height direction of the protrusion, and the step portion is formed along the length direction of the protrusion. It is characterized by forming a slit. (2) In the heat transfer tube of (1) above, a slit is formed at the top of the protrusion along the length direction of the protrusion. (3) Further, in the heat transfer tube of (1) above, a slit is formed at a top portion of the protrusion in a direction intersecting a length direction of the protrusion.
【０００６】[0006]
【作用】前記本発明（１），（２）及び（３）は前記の
ように構成されているので、次の作用を有する。即ち、
冷媒管の管内流体の凝縮時には、螺旋状の突起に形成さ
れた段部により、凝縮液の乱れが促進され、ガス部分と
の管内面との接触がしやすくなるとともに液部分での熱
伝達が向上する。Since the present inventions (1), (2) and (3) are constructed as described above, they have the following effects. That is,
During the condensation of the fluid in the refrigerant tube, the step formed on the spiral protrusion promotes the turbulence of the condensate, which facilitates the contact of the gas portion with the inner surface of the tube and heat transfer in the liquid portion. improves.
【０００７】また、管内流体の蒸発（沸騰）時には、螺
旋状の突起に形成された段部に前記突起の長さ方向に沿
って形成されたスリット、又は同スリットと前記突起の
頂部に前記突起の長さ方向に沿って形成されたスリッ
ト、もしくは前記突起の頂部に前記突起の長さ方向と交
わる方向に形成されたスリットとが、沸騰現象の核とな
って管内流体の沸騰を促進維持するとともに、管内流体
の液膜を管上面まで引上げやすくして熱伝達率が向上す
る。Further, when the fluid in the pipe evaporates (boils), a slit formed along the lengthwise direction of the protrusion on the step formed on the spiral protrusion, or the protrusion on the top of the slit and the protrusion. A slit formed along the length direction of the projection, or a slit formed on the top of the projection in a direction intersecting the length direction of the projection serves as a nucleus of the boiling phenomenon to promote and maintain boiling of the fluid in the tube. At the same time, the liquid film of the fluid in the pipe is easily pulled up to the upper surface of the pipe, and the heat transfer coefficient is improved.
【０００８】更に、前記螺旋状突起の基本形状は、従来
のものに比べ大きく変わることがないため、流動抵抗の
増大をまねくことなく熱伝達率向上を図ることができ
る。Further, since the basic shape of the spiral projection does not change much as compared with the conventional one, the heat transfer coefficient can be improved without increasing the flow resistance.
【０００９】[0009]
【実施例】本発明の第１の実施例を、図１及び図２によ
って説明する。冷媒が内部を流れる伝熱管１の内面に
は、断面が山形の複数条の突起２が螺旋状に設けられて
いる。この突起２は、図５に示す従来の伝熱管の突起０
２と同様な台形の基本断面形状を有しており、突起２の
両側面の高さ方向の中間の部分に突起２の長さ方向に沿
って連続した段部４が形成されており、この段部４によ
って突起２の上部に突出部６が形成されている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIGS. On the inner surface of the heat transfer tube 1 through which the refrigerant flows, a plurality of projections 2 having a mountain-shaped cross section are provided in a spiral shape. This protrusion 2 is the protrusion 0 of the conventional heat transfer tube shown in FIG.
It has a trapezoidal basic cross-sectional shape similar to that of No. 2, and a step portion 4 continuous along the length direction of the protrusion 2 is formed at an intermediate portion of both sides of the protrusion 2 in the height direction. A projecting portion 6 is formed above the projection 2 by the step portion 4.
【００１０】前記段部４には、突起２の長さ方向に沿っ
てスリット５が形成されており、これによって段部４は
微小な突起状の形状を有している。また、突起２の頂部
にも突起２の長さ方向に沿ってスリット７が設けられて
いる。なお、図１中３は冷媒液である。Slits 5 are formed in the step portion 4 along the lengthwise direction of the projection 2, so that the step portion 4 has a minute projection shape. Further, slits 7 are also provided on the tops of the protrusions 2 along the length direction of the protrusions 2. In addition, 3 in FIG. 1 is a refrigerant liquid.
【００１１】本実施例に係る伝熱管は、次のようにして
製造される。即ち、金属帯状の表面に長手方向に傾斜さ
せて複数の台形の突起を所定間隔でほぼ平行に設け、こ
の台形の突起の両側の面に台形の突起の長さ方向に沿っ
て鋭角的にスリットを形成すると同時に台形の突起の両
側の面の中央部を突出させて台形の突起の長さ方向に沿
って段差を形成し、また、台形の突起の頂部のほぼ中央
部に台形の突起の長さ方向に沿って鋭角的にスリットを
形成する。その上で、前記の段部とスリットが形成され
た台形の突起を備えた金属帯板を、台形の突起を内面と
して長手方向に連続造管し、両縁辺を溶接して伝熱管と
する。The heat transfer tube according to this embodiment is manufactured as follows. That is, a plurality of trapezoidal protrusions are provided on the surface of the metal strip in the longitudinal direction so as to be substantially parallel to each other at a predetermined interval, and the sides of the trapezoidal protrusions are acutely slit along the length direction of the trapezoidal protrusions. At the same time when the trapezoidal protrusion is formed, the central portions of both sides of the trapezoidal protrusion are projected to form a step along the lengthwise direction of the trapezoidal protrusion. A slit is formed at an acute angle along the vertical direction. Then, a metal strip plate having a trapezoidal protrusion having the step and the slit is continuously pipe-formed in the longitudinal direction with the trapezoidal protrusion as an inner surface, and both edges are welded to form a heat transfer tube.
【００１２】以上のような構成をもつ本実施例では、突
起２の高さ方向に形成された段部４が、冷媒の凝縮時に
管内を流れる冷媒の液乱れを促進するように働き、熱伝
達率を向上して伝熱性能向上を図ることができるまた、
前記段部４と突起２の頂部に突起２の長さ方向に沿って
形成されたスリット５，７は、冷媒の沸騰時に沸騰現象
の核として働き、冷媒の沸騰を促進・維持するととも
に、冷媒液膜を管上面まで引き上げやすくして熱伝達率
向上による伝熱性能向上を図ることができる。In the present embodiment having the above-mentioned structure, the step portion 4 formed in the height direction of the protrusion 2 works to promote the liquid turbulence of the refrigerant flowing in the pipe when the refrigerant is condensed, and the heat transfer. The heat transfer performance can be improved by improving the rate.
The slits 5 and 7 formed along the lengthwise direction of the protrusion 2 on the tops of the step portion 4 and the protrusion 2 act as nuclei of a boiling phenomenon when the refrigerant boils, promote and maintain the boiling of the refrigerant, and The liquid film can be easily pulled up to the upper surface of the pipe to improve the heat transfer performance by improving the heat transfer coefficient.
【００１３】また、図１及び図２に示すように、突起２
の基本断面形状は、図５に示す従来の突起断面形状と大
きく変化することがないため、流動抵抗の増大をまねく
ことなく、熱伝達率向上を図ることができる。As shown in FIGS. 1 and 2, the protrusion 2
Since the basic cross-sectional shape of No. 1 does not significantly change from the conventional cross-sectional shape of the protrusion shown in FIG. 5, it is possible to improve the heat transfer coefficient without increasing the flow resistance.
【００１４】本発明の第２の実施例を、図３によって説
明する。本実施例は、前記第１の実施例において突起２
の頂部に突起２の長さ方向に沿って設けられたスリット
７を設けることなく、突起２の頂部に突起２の長さ方向
と交わる方向に複数のスリット８を設けるようにしてい
る。A second embodiment of the present invention will be described with reference to FIG. This embodiment is similar to the first embodiment except that the protrusion 2
The slits 7 provided along the length direction of the projection 2 are not provided at the top of the projection 2, and a plurality of slits 8 are provided at the top of the projection 2 in a direction intersecting with the length direction of the projection 2.
【００１５】本実施例における突起２の段部４、スリッ
ト５の作用及び効果は、前記の第１の実施例における作
用及び効果と異なるところはないが、前記のように突起
２の頂部に突起２の長さ方向と交わる方向に設けられた
複数のスリット８は、冷媒の沸騰時に沸騰現象の核とし
て働き、冷媒の沸騰を促進・維持して沸騰熱の伝達率を
向上させることができる。The operation and effect of the step portion 4 and the slit 5 of the projection 2 in this embodiment are not different from the operation and effect in the first embodiment, but as described above, the projection is formed on the top of the projection 2. The plurality of slits 8 provided in the direction intersecting with the length direction of 2 act as the core of the boiling phenomenon when the refrigerant boils, and can promote and maintain the boiling of the refrigerant to improve the boiling heat transfer coefficient.
【００１６】なお、前記第１及び第２の実施例では、段
部４を突起２の両側面に１個宛設けているが、これを複
数個設けるようにすることもできる。In the first and second embodiments, one step portion 4 is provided on both side surfaces of the protrusion 2, but a plurality of step portions 4 may be provided.
【００１７】[0017]
【発明の効果】本発明は、特許請求の範囲の請求項１，
２及び３に記載されたように、伝熱管内面に形成された
螺旋状の突起の高さ方向に段部を形成し、同段部に突起
の長さ方向に沿ってスリットを形成しており、また更
に、以上に加えて、突起の頂部に突起の長さ方向に沿っ
てスリットを形成し又は突起の頂部に突起の長さ方向と
交わる方向のスリットを形成しているために、伝熱管内
の流動抵抗を増大させることなく、伝熱管内の流体の凝
縮・蒸発いずれの場合においても熱伝達率の向上を図
り、高い伝熱性能を得ることができる。The present invention relates to claims 1 and 2 of the claims.
As described in 2 and 3, a step portion is formed in the height direction of the spiral protrusion formed on the inner surface of the heat transfer tube, and a slit is formed in the step portion along the length direction of the protrusion. Moreover, in addition to the above, heat transfer is performed because a slit is formed along the length direction of the protrusion at the top of the protrusion or a slit is formed at the top of the protrusion in a direction intersecting with the length direction of the protrusion. It is possible to improve the heat transfer coefficient and obtain high heat transfer performance in both cases of condensation and evaporation of the fluid in the heat transfer tube without increasing the flow resistance in the tube.
【図１】本発明の第１の実施例に係る伝熱管の断面図で
ある。FIG. 1 is a cross-sectional view of a heat transfer tube according to a first embodiment of the present invention.
【図２】同実施例の要部の拡大断面図である。FIG. 2 is an enlarged sectional view of a main part of the embodiment.
【図３】本発明の第２の実施例に係る伝熱管の斜視図で
ある。FIG. 3 is a perspective view of a heat transfer tube according to a second embodiment of the present invention.
【図４】従来の管内面に螺旋状溝を有する伝熱管の内面
を示す断面図である。FIG. 4 is a cross-sectional view showing an inner surface of a conventional heat transfer tube having a spiral groove on the inner surface of the tube.
【図５】前記従来の伝熱管の軸方向に対し垂直方向にと
った断面図である。FIG. 5 is a cross-sectional view taken in a direction perpendicular to the axial direction of the conventional heat transfer tube.
１ 伝熱管 ２ 突起 ３ 冷媒液 ４ 段部 ５ スリット ６ 突出部 ７ スリット ８ スリット 1 Heat Transfer Tube 2 Protrusion 3 Refrigerant Liquid 4 Step 5 Slit 6 Projection 7 Slit 8 Slit
フロントページの続き (72)発明者 松田 憲兒 名古屋市中村区岩塚町字高道１番地 三菱 重工業株式会社名古屋研究所内 (72)発明者 吉越 明 名古屋市中村区岩塚町字高道１番地 三菱 重工業株式会社名古屋研究所内Front page continued (72) Inventor Kenji Matsuda No. 1 Takamichi, Iwazuka-cho, Nakamura-ku, Nagoya City Mitsubishi Heavy Industries, Ltd. Nagoya Research Institute (72) Inventor Akira Yoshikoshi No. 1 Takamichi, Iwatsuka-machi, Nakamura-ku, Nagoya Mitsubishi Heavy Industries Nagoya Research Institute Co., Ltd.
Claims (3)
なる伝熱管において、前記突起の高さ方向に段部を形成
し、同段部に突起の長さ方向に沿ってスリットを形成し
てなることを特徴とする伝熱管。1. A heat transfer tube having a plurality of spiral protrusions formed on an inner surface thereof, wherein a step portion is formed in a height direction of the protrusion, and a slit is formed in the step portion along a length direction of the protrusion. A heat transfer tube characterized by being formed.
てスリットを形成してなることを特徴とする請求項１に
記載の伝熱管。2. The heat transfer tube according to claim 1, wherein a slit is formed at the top of the protrusion along the length direction of the protrusion.
る方向のスリットを形成してなることを特徴とする請求
項１に記載の伝熱管。3. The heat transfer tube according to claim 1, wherein a slit is formed at a top portion of the protrusion in a direction intersecting a length direction of the protrusion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8961794A JPH07190663A (en) | 1993-11-16 | 1994-04-27 | Heating tube |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5-61620 | 1993-11-16 | ||
| JP6162093 | 1993-11-16 | ||
| JP8961794A JPH07190663A (en) | 1993-11-16 | 1994-04-27 | Heating tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07190663A true JPH07190663A (en) | 1995-07-28 |
Family
ID=26402671
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8961794A Pending JPH07190663A (en) | 1993-11-16 | 1994-04-27 | Heating tube |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07190663A (en) |
Cited By (7)
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|---|---|---|---|---|
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| CN102121805A (en) * | 2011-04-07 | 2011-07-13 | 金龙精密铜管集团股份有限公司 | Enhanced heat transfer tube used for falling film evaporator |
| WO2012036965A1 (en) * | 2010-09-17 | 2012-03-22 | Siemens Energy, Inc. | Turbine component with multi - scale turbulation features |
| US20130149169A1 (en) * | 2011-01-06 | 2013-06-13 | Christian X. Campbell | Component having cooling channel with hourglass cross section |
| US20140318492A1 (en) * | 2011-11-26 | 2014-10-30 | Mahle International Gmbh | Piston for an internal combustion engine and method for producing same |
| FR3089549A1 (en) * | 2018-12-07 | 2020-06-12 | Safran Aircraft Engines | Turbomachine hollow vane equipped with primary and secondary disturbers |
| CN116678251A (en) * | 2023-06-07 | 2023-09-01 | 山东恒辉节能技术集团有限公司 | Internal thread heat exchange tube and its manufacturing equipment and manufacturing method |
-
1994
- 1994-04-27 JP JP8961794A patent/JPH07190663A/en active Pending
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6446710B2 (en) | 1999-12-28 | 2002-09-10 | Alstom (Switzerland) Ltd | Arrangement for cooling a flow-passage wall surrrounding a flow passage, having at least one rib element |
| DE19963374B4 (en) * | 1999-12-28 | 2007-09-13 | Alstom | Device for cooling a flow channel wall surrounding a flow channel with at least one rib element |
| EP1114976A3 (en) * | 1999-12-28 | 2001-10-31 | ALSTOM POWER (Schweiz) AG | Device for cooling a conduit wall provided with at least one fin element |
| US8894367B2 (en) | 2009-08-06 | 2014-11-25 | Siemens Energy, Inc. | Compound cooling flow turbulator for turbine component |
| US20150078898A1 (en) * | 2009-08-06 | 2015-03-19 | Mikros Systems, Inc. | Compound Cooling Flow Turbulator for Turbine Component |
| EP3399150A1 (en) * | 2010-09-17 | 2018-11-07 | Siemens Energy, Inc. | Turbine component with multi-scale turbulation features |
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