JPH0439596A - Boiling type heat transfer tube - Google Patents
Boiling type heat transfer tubeInfo
- Publication number
- JPH0439596A JPH0439596A JP14761990A JP14761990A JPH0439596A JP H0439596 A JPH0439596 A JP H0439596A JP 14761990 A JP14761990 A JP 14761990A JP 14761990 A JP14761990 A JP 14761990A JP H0439596 A JPH0439596 A JP H0439596A
- Authority
- JP
- Japan
- Prior art keywords
- heat transfer
- tube
- cavity
- fins
- heat exchanger
- 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
- 238000009835 boiling Methods 0.000 title claims description 12
- 238000012546 transfer Methods 0.000 title abstract description 21
- 238000013021 overheating Methods 0.000 abstract description 4
- 238000000034 method Methods 0.000 abstract 2
- 238000000465 moulding Methods 0.000 abstract 1
- 239000007788 liquid Substances 0.000 description 10
- 230000000694 effects Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000001704 evaporation Methods 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000001737 promoting effect 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
- F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
- F28F13/18—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by applying coatings, e.g. radiation-absorbing, radiation-reflecting; by surface treatment, e.g. polishing
- F28F13/185—Heat-exchange surfaces provided with microstructures or with porous coatings
- F28F13/187—Heat-exchange surfaces provided with microstructures or with porous coatings especially adapted for evaporator surfaces or condenser surfaces, e.g. with nucleation sites
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は空調機、冷凍機などの伝熱管に使用される液体
を蒸発、沸騰させる場合の性能を向上させた沸騰型伝熱
管に関するものである。[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a boiling type heat exchanger tube with improved performance when evaporating and boiling liquid used in heat exchanger tubes for air conditioners, refrigerators, etc. be.
一般に沸騰熱伝達を促進させるためにはりエンドラント
構造の空洞部（開口部より内部に進入するに従って末広
がりになっている空洞部）を有する伝熱管が有効である
ことが知られている（例えば特開昭５７−１３１９９２
号他）、これは低過熱時の沸騰の際、残留気泡の捕獲に
有効であることが知られている。In general, it is known that heat transfer tubes having a cavity with a beam end runt structure (a cavity that widens toward the end as one enters the interior from the opening) are effective for promoting boiling heat transfer (for example, a special Kaisho 57-131992
(No. et al.), this is known to be effective in capturing residual air bubbles during boiling at low superheats.
最近では、更に高い伝熱性能を得るため例えば特開昭６
１−７３３９１号公報に見られるように空洞内部に空洞
部内を含む開口部近傍から該空洞部を横ぎる方向へ突出
した突起を設け、この突起により突起のある開口部を通
過する液体の流れを整理する伝熱壁面が提案されている
。Recently, in order to obtain even higher heat transfer performance, for example,
As seen in Publication No. 1-73391, a protrusion is provided inside the cavity that protrudes from the vicinity of the opening including the inside of the cavity in a direction across the cavity, and the protrusion allows the flow of liquid to pass through the opening with the protrusion. A heat transfer wall surface has been proposed to organize the heat transfer.
この伝熱壁面は、低過熱時における空洞部からの液体流
入を抑えることで空洞部内の液体の１１１９を維持させ
、液体の蒸発を促進させるものである。This heat transfer wall surface maintains the liquid 1119 in the cavity by suppressing the inflow of liquid from the cavity during low superheating, and promotes evaporation of the liquid.
しかしながら空洞部への液体流入の抵抗を増やすことは
高過熱時に空洞部への液体流入量を低下させることにな
り、熱伝達低下をまねくおそれがある。However, increasing the resistance to the flow of liquid into the cavity will reduce the amount of liquid flowing into the cavity at the time of high overheating, which may lead to a decrease in heat transfer.
［発明が解決しようとする課題］
本発明は上記の問題について検討の結果なされたもので
、高流束時（高過熱時）においても高い伝熱性能を有し
、熱負荷変動に応じた機器運転の対応が可能であり、空
調機および冷凍機等の小型化、高性能化が図れる沸騰型
伝熱管を開発したものである。[Problems to be Solved by the Invention] The present invention has been made as a result of studies on the above-mentioned problems, and is a device that has high heat transfer performance even at high flux (high overheating) and can respond to heat load fluctuations. We have developed a boiling type heat exchanger tube that can be used to reduce the size and improve the performance of air conditioners and refrigerators.
本発明は、管の外表面に管軸方向に所望のピッチを有し
て環状または螺旋状で管周方向に連続している開口部を
有する空洞部を設けると共に、管周方向に所望のピッチ
で該開口部を結ぶように管軸方向に小開口部と小空洞部
を設けた伝熱管において、該空洞部の底部に円周方向に
連続する尖状突起を設けたことを特徴とする沸騰型伝熱
管である。The present invention provides a cavity having an annular or spiral opening continuous in the circumferential direction with a desired pitch in the tube axis direction on the outer surface of the tube, and a desired pitch in the tube circumferential direction. A heat exchanger tube having a small opening and a small cavity in the axial direction of the tube so as to connect the openings, characterized in that a pointed projection continuous in the circumferential direction is provided at the bottom of the cavity. It is a type heat exchanger tube.
すなわち本発明は、第１図および第２図に示すように、
管の外表面（１）に管軸方向に所望のピッチ（Ｐ）を有
して環状または螺旋状で管周方向に連続している開口部
（２）を有する空洞部（３）を設けると共に、管周方向
に所望のピッチ（Ｐ′）で上記の開口部（２）を結ぶよ
うに管軸方向に小開口部（４）と小空洞部（５）を設け
、かつ上記の空洞部（３）の底部に尖状突起（６）を設
けて伝熱管（７）としたものである。That is, the present invention, as shown in FIGS. 1 and 2,
A cavity (3) having a desired pitch (P) in the tube axis direction and an annular or spiral opening (2) continuous in the tube circumferential direction is provided on the outer surface (1) of the tube. , a small opening (4) and a small cavity (5) are provided in the tube axis direction so as to connect the above openings (2) at a desired pitch (P') in the tube circumferential direction, and the above-mentioned cavity ( 3) is provided with a sharp protrusion (6) on the bottom to form a heat exchanger tube (7).
本発明の伝熱管は、前記の従来の特開昭５７−１３１９
５２号のような管周方向に設けた開口部を有する空洞部
およびこれらを結ぶ管軸方向に設けた小開口部を有する
小空洞部により沸騰作用を促進させたものに、さらに上
記の空洞部の底部に尖状突起を設けたものである。この
尖状突起は、空洞部内に浸入した液体の濡れ面積を増大
させ、尖状突起の谷部の角により薄膜維持を容易にさせ
、熱伝達の向上に有効に作用するものである。The heat exchanger tube of the present invention is similar to the conventional method disclosed in Japanese Patent Application Laid-Open No. 57-1319.
No. 52, in which the boiling action is promoted by a cavity having an opening in the circumferential direction of the tube and a small cavity having a small opening in the axial direction of the tube connecting these, and the above-mentioned cavity. It has a sharp protrusion on the bottom. These sharp protrusions increase the wetted area of the liquid that has entered the cavity, and the corners of the valleys of the sharp protrusions make it easier to maintain a thin film, thereby effectively improving heat transfer.
しかして上記の空洞部（３）のピッチ（Ｐ）は１吋当り
２５個〜４５個の範囲で設けるのが好ましく、また上記
の小空洞部（５）のピッチ（Ｐ′）は１吋当り２５個〜
４５個の範囲で存在するのが好ましい。Therefore, it is preferable that the pitch (P) of the above-mentioned cavity part (3) is in the range of 25 to 45 pieces per inch, and the pitch (P') of the above-mentioned small cavity part (5) is set in the range of 25 to 45 pieces per inch. 25 pieces ~
Preferably, the number is in the range of 45.
さらに上記の空洞部の底部に設ける尖状突起（６）の高
さは空洞部の管外表面からの深さの１７３〜１／１０が
適当である。空洞部の深さに比べて高過ぎると空洞部内
容積が減少して気泡成長の妨げとなり熱伝達低下をまね
き、また、これより低いと空洞部内に浸入した液体の濡
れ面積を増大させ、突起の谷部の角により薄膜維持を容
易にする作用が小さくなるからである。Further, the height of the pointed protrusion (6) provided at the bottom of the cavity is preferably 173 to 1/10 of the depth from the outer surface of the cavity. If it is too high compared to the depth of the cavity, the internal volume of the cavity will decrease, which will impede bubble growth and cause a decrease in heat transfer.If it is lower than this, the wetted area of the liquid that has entered the cavity will increase, causing protrusions. This is because the effect of facilitating thin film maintenance is reduced by the corners of the troughs.
本発明の伝熱管の製造には例えば、第３図に示すような
従来のローフインチューブを製作するディスク先端に溝
加工を施したディスク（８）を用いる。For manufacturing the heat exchanger tube of the present invention, for example, a disk (8) with grooves formed at the tip of a disk used to manufacture a conventional loaf-in tube as shown in FIG. 3 is used.
このディスク（８）を管（９）に押し付けながら回転さ
せることによりフィン（１０）が形成されると同時にフ
ィン間の根元部に尖状突起（６）が形成される。続いて
次第に外径の大きくなる変形用ディスク（１１）により
上記フィンの先端部を押しつぶすように加工を施すと、
上記の尖状突起が残り、管周方向に連なる開口部（２）
と空洞部（３）が形成されると共に、上記開口部（２）
を結ぶように第２図に示す管軸方向に連なる小開口部（
４）と小空洞部（５）が形成されるものである。By rotating this disk (8) while pressing it against the tube (9), fins (10) are formed, and at the same time, pointed protrusions (6) are formed at the bases between the fins. Next, the tips of the fins are processed to be crushed by a deforming disk (11) whose outer diameter gradually increases.
Opening (2) where the above-mentioned pointed protrusion remains and continues in the circumferential direction
and a cavity (3) is formed, and the opening (2)
The small openings (
4) and a small cavity (5) are formed.
上記のような本発明の伝熱管は、管外周方向と軸方向に
開口部と空洞部を有する他に管外周方向の空洞部の底部
にさらに尖状突起を設けであるので沸騰促進機構が増加
し、熱伝達性能が従来のものに比べ著しく向上するもの
である。The heat exchanger tube of the present invention as described above has openings and cavities in the tube outer circumferential direction and axial direction, and is further provided with a pointed protrusion at the bottom of the hollow portion in the tube outer circumferential direction, so that the boiling promotion mechanism is increased. However, the heat transfer performance is significantly improved compared to the conventional one.
〔実施例］ 以下に本発明の一実施例について説明する。〔Example] An embodiment of the present invention will be described below.
外径１９．０５閣φ、肉厚１．２４ｍｍの銅管を用い、
第３図に示すようなフィン成形用のディスク（８）を押
付は回転させながらフィン（１０）を形成させると同時
にフィンの根元に尖状突起（６）を形成した。続いて外
径の大きくなる変形用ディスク（１１）によりフィンの
先端より押しつぶすように順次加工を施して第１図およ
び第２回に示すような伝熱管を作製した。この伝熱管は
管軸方向に１吋当り４０の開口部（２）と空洞部（３）
を有し、空洞部（３）の深さは平均０．４■であり、そ
の底部に突起の高さ平均０．１ ｒｍの尖状突起（６）
を有し、かつ上記の開口部（２）を結ぶように管軸方向
に連なる多数の小開口部（４）と小空洞部（５）を有す
るものである。Using a copper tube with an outer diameter of 19.05 mm and a wall thickness of 1.24 mm,
A fin-forming disk (8) as shown in FIG. 3 was pressed and rotated to form fins (10), and at the same time, a pointed protrusion (6) was formed at the base of the fin. Subsequently, the fins were successively processed using deformable disks (11) with increasing outer diameters so as to crush the fins starting from the tips, thereby producing heat exchanger tubes as shown in FIG. 1 and Part 2. This heat exchanger tube has 40 openings (2) and cavities (3) per inch in the tube axis direction.
The depth of the cavity (3) is 0.4 mm on average, and the pointed protrusion (6) with an average height of 0.1 rm is formed at the bottom of the cavity (3).
It has a large number of small openings (4) and small cavities (5) that are connected in the tube axis direction so as to connect the above-mentioned openings (2).
上記の伝熱管と従来の尖状突起のない伝熱管を用いて沸
騰液中における熱伝達率を比較したところ本発明の伝熱
管は従来のものに比較して高過熱時における熱伝達率は
１０％以上向上することが判った。When comparing the heat transfer coefficient in boiling liquid using the above heat exchanger tube and a conventional heat exchanger tube without pointed protrusions, the heat transfer coefficient of the heat exchanger tube of the present invention at high superheating was 10% higher than that of the conventional tube. It was found that the improvement was more than %.
以上に説明したように本発明によれば、高流束時におい
て高い伝熱性能を示す伝熱管が得られるもので工業上顕
著な効果を奏するものである。As explained above, according to the present invention, it is possible to obtain a heat exchanger tube that exhibits high heat transfer performance at high flux, and has a significant industrial effect.
第１図は本発明の一実施例に係る伝熱管の断面図、第２
図は伝熱管の展開斜視図、第３図は伝熱管の製造方法を
説明する断面図である。
１・・・管外表面、 ２・・・開口部、 ３・・・空洞
部、４・・・小開口部、 ５・・・小空洞部、６・・・
尖状突起、７・・・伝熱管。FIG. 1 is a sectional view of a heat exchanger tube according to an embodiment of the present invention, and FIG.
The figure is a developed perspective view of the heat exchanger tube, and FIG. 3 is a sectional view illustrating a method of manufacturing the heat exchanger tube. DESCRIPTION OF SYMBOLS 1... Tube outer surface, 2... Opening, 3... Cavity, 4... Small opening, 5... Small cavity, 6...
Pointed projection, 7... Heat exchanger tube.
Claims (2)
状または螺旋状で管周方向に連続している開口部を有す
る空洞部を設けると共に、管周方向に所望のピッチで該
開口部を結ぶように管軸方向に小開口部と小空洞部を設
けた伝熱管において、該空洞部の底部に円周方向に連続
する尖状突起を設けたことを特徴とする沸騰型伝熱管。(1) Provide a hollow section on the outer surface of the tube with an annular or spiral opening having a desired pitch in the axial direction of the tube and continuous in the circumferential direction; A boiling type heat exchanger tube having a small opening and a small cavity in the tube axis direction so as to connect the openings, characterized in that a pointed protrusion continuous in the circumferential direction is provided at the bottom of the cavity. heat exchanger tube.
０であることを特徴とする請求項１記載の沸騰型伝熱管
。(2) The height of the pointed protrusion is 1/3 to 1/1 of the depth of the cavity
2. The boiling type heat exchanger tube according to claim 1, wherein the boiling type heat exchanger tube has a temperature of 0.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14761990A JPH0439596A (en) | 1990-06-06 | 1990-06-06 | Boiling type heat transfer tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14761990A JPH0439596A (en) | 1990-06-06 | 1990-06-06 | Boiling type heat transfer tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0439596A true JPH0439596A (en) | 1992-02-10 |
Family
ID=15434422
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14761990A Pending JPH0439596A (en) | 1990-06-06 | 1990-06-06 | Boiling type heat transfer tube |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0439596A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6913073B2 (en) * | 2001-01-16 | 2005-07-05 | Wieland-Werke Ag | Heat transfer tube and a method of fabrication thereof |
| EP2101136A2 (en) | 2008-03-12 | 2009-09-16 | Wieland-Werke Ag | Vaporiser pipe with optimised undercut on groove base |
| DE102016006914A1 (en) | 2016-06-01 | 2017-12-07 | Wieland-Werke Ag | heat exchanger tube |
-
1990
- 1990-06-06 JP JP14761990A patent/JPH0439596A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6913073B2 (en) * | 2001-01-16 | 2005-07-05 | Wieland-Werke Ag | Heat transfer tube and a method of fabrication thereof |
| EP2101136A2 (en) | 2008-03-12 | 2009-09-16 | Wieland-Werke Ag | Vaporiser pipe with optimised undercut on groove base |
| US8281850B2 (en) | 2008-03-12 | 2012-10-09 | Wieland-Werke Ag | Evaporator tube with optimized undercuts on the groove base |
| DE102016006914A1 (en) | 2016-06-01 | 2017-12-07 | Wieland-Werke Ag | heat exchanger tube |
| WO2017207089A1 (en) | 2016-06-01 | 2017-12-07 | Wieland-Werke Ag | Heat exchanger tube |
| DE102016006914B4 (en) | 2016-06-01 | 2019-01-24 | Wieland-Werke Ag | heat exchanger tube |
| US10996005B2 (en) | 2016-06-01 | 2021-05-04 | Wieland-Werke Ag | Heat exchanger tube |
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