JPS61280392A - Heat transfer tube - Google Patents
Heat transfer tubeInfo
- Publication number
- JPS61280392A JPS61280392A JP10298785A JP10298785A JPS61280392A JP S61280392 A JPS61280392 A JP S61280392A JP 10298785 A JP10298785 A JP 10298785A JP 10298785 A JP10298785 A JP 10298785A JP S61280392 A JPS61280392 A JP S61280392A
- Authority
- JP
- Japan
- Prior art keywords
- tube
- steam
- heat transfer
- fins
- port side
- 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
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
【発明の詳細な説明】
（イ）産業上の利用分野
本発明は、冷凍機の蒸発器や凝縮器あるいは蒸気熱源式
吸収冷凍機の発生器などに用いる伝熱管に関し、特に、
管内面に複数のフィンが設けられていて管内に蒸気を流
すようにした伝熱管（以下、この種の伝熱管という）の
改良に関する。DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Application Field The present invention relates to heat transfer tubes used in evaporators and condensers of refrigerators, generators of steam heat source absorption refrigerators, etc.
The present invention relates to an improvement in a heat exchanger tube (hereinafter referred to as this type of heat exchanger tube) having a plurality of fins provided on the inner surface of the tube to allow steam to flow inside the tube.
（ロ）従来の技術
この種の伝熱管の従来の技術として、管内面に螺旋状も
しくは平行環状のフィンを設けたもの〔例えば、実公昭
４１−２４２２９号公報〕が知られている。(b) Prior Art As a conventional technology for this type of heat exchanger tube, one in which spiral or parallel annular fins are provided on the inner surface of the tube (for example, Japanese Utility Model Publication No. 41-24229) is known.
（ハ）発明が解決しようとする問題点
この種の伝熱管は、管内面を平滑にした伝熱管とくらべ
伝熱性能に秀れるため、例えば特開昭４６−２４９０号
公報にみられるように吸収冷凍機の熱交換器用素材とし
て、以前から使用されている。(c) Problems to be Solved by the Invention This type of heat transfer tube has superior heat transfer performance compared to heat transfer tubes with smooth inner surfaces. It has long been used as a material for heat exchangers in absorption refrigerators.
しかし、従来のこの種の伝熱管においては、フィ、ンの
高さが一定であって蒸気の流入側と流出側とで伝熱面積
に差がないため、例えば吸収冷凍機の発生器に過熱蒸気
を供給するときのように伝熱管に流入する蒸気の乾き度
が高い場合、伝熱管の入口側では蒸気の顕熱が十分に伝
わらずに乾き度の高いまま蒸気が流れてその凝縮潜熱の
伝達が不充分となる傾向をもち、凝縮伝熱管としての性
能が十分に発揮されないという問題点を有していた。However, in conventional heat transfer tubes of this kind, the height of the fins is constant and there is no difference in the heat transfer area between the steam inflow side and the steam outflow side. When the steam flowing into the heat exchanger tube is highly dry, such as when steam is supplied, the sensible heat of the steam is not sufficiently transferred to the inlet side of the heat exchanger tube, and the steam flows with a high degree of dryness, reducing its latent heat of condensation. There was a problem that the transfer tended to be insufficient, and the performance as a condensing heat exchanger tube was not fully demonstrated.
本発明は、この問題点に鑑み、乾き度の高い蒸気が管内
に供給される場合にも、その性能を十分に発揮すること
のできるこの種の伝熱管の提供を目的としたものである
。In view of this problem, the present invention aims to provide a heat exchanger tube of this type that can fully exhibit its performance even when steam with a high degree of dryness is supplied into the tube.
（勾 問題点を解決するための手段
本発明は、上記の問題点を解決する手段として、フィン
の高さが管の入口側に近い程高≦なり中口側に近い程低
くなるようにし、かつ、フィンが管軸に沿って長手方向
へ平行に延びるようにこの種の伝熱管を構成したもので
ある。(Means for Solving the Gradient Problem) The present invention solves the above problem by making the height of the fins so that the closer they are to the entrance side of the pipe, the higher the height is, and the closer they are to the middle entrance side, the lower the height of the fins is. In addition, this type of heat transfer tube is configured such that the fins extend parallel to the longitudinal direction along the tube axis.
（ホ）作用
本発明によれば、管の入口側に近い程フィンの高さを大
にして管内の伝熱面を広く形成１−ているので、乾き度
の高い蒸気の顕熱が入口側に近い部分で管外へ伝えられ
、蒸気が管の入口側に近い部分で飽和状態となりやすい
作用をこの種の伝熱管にもたせ得る。このため、伝熱管
の大部分にセいて蒸気の凝縮潜熱な管外の被加熱流体に
伝えることができる。かつまた、フィンが管軸に沿って
長手方向へ平行に延びるよう形成されていると共にその
高さが管の出口側へ近づく程低くなるように形成されて
いるので、管内゛の流れの悪化も防止できる。(E) Function According to the present invention, the height of the fins is increased closer to the inlet side of the tube to form a wider heat transfer surface within the tube, so that the sensible heat of steam with high dryness is transferred to the inlet side. This type of heat exchanger tube can have the effect that steam is transmitted to the outside of the tube at a portion close to the tube, and steam tends to reach a saturated state at a portion close to the inlet side of the tube. Therefore, the latent heat of condensation of steam can be transferred to the heated fluid outside the tube through most of the heat transfer tube. Furthermore, since the fins are formed to extend parallel to the longitudinal direction along the tube axis, and their height decreases as they approach the outlet side of the tube, deterioration of the flow inside the tube is avoided. It can be prevented.
したがって、本発明によれば管内に乾き度の高い蒸気が
流入する場合にも蒸気の凝縮潜熱を管外へ十分に伝える
ことができ、この種の伝熱管の性能を良好に発揮させる
ことができる。Therefore, according to the present invention, even when highly dry steam flows into the tube, the latent heat of condensation of the steam can be sufficiently transferred to the outside of the tube, and this type of heat transfer tube can exhibit good performance. .
（へ）実施例
第１図は本発明による伝熱管の一実施例を示した正面図
で、図の破線はフィンと管内面とを表わしている。また
、第２図は第１図に示した管の斜視図である。(F) Embodiment FIG. 1 is a front view showing an embodiment of the heat exchanger tube according to the present invention, and the broken lines in the figure represent the fins and the inner surface of the tube. 2 is a perspective view of the tube shown in FIG. 1.
第１図および第２図において、（１）は管内を蒸気の流
路と１−だ伝熱管で、その内面には管軸に沿って平行に
延びる多数のフィン（２１、（２）・・・が設けである
。そして、これらフィン（２）、（２）・・・は、その
高さが管の入口側〔蒸気の流入側〕から管の出口側〔蒸
気の流出側〕へ向って次第に低くなるように、形成され
ている（第１図参照）。なお、この伝熱管（１）は内面
にフィン（２１、（２）・・・を設げた部分（Ａ１〔以
下、フィン部（Ａｌという〕と内面の平滑な部分（Ｂｌ
〔以下、平滑部（Ｂｌという〕とで成っている。In Figures 1 and 2, (1) is a heat transfer tube with a steam flow path and a heat transfer tube, and on its inner surface there are many fins (21, (2)...) extending parallel to the tube axis. The height of these fins (2), (2)... increases from the inlet side of the tube (steam inflow side) to the outlet side of the tube (steam outflow side). The heat exchanger tube (1) is formed so as to be gradually lowered (see Fig. 1).The heat exchanger tube (1) has a portion (A1) (hereinafter referred to as a fin portion ( (called Al) and the smooth inner surface (called Bl
[Hereinafter, referred to as a smooth portion (hereinafter referred to as Bl)].
次に、このような構成の伝熱管（１１へ乾き度の高い蒸
気すなわち過熱蒸気が流入した場合における動作例を説
明する。この伝熱管ｉｌ＋の入口側では管内の伝熱面積
が広く形成されているので、過熱蒸気の顕熱が管の入口
側で管外へ多量に伝わり、過熱蒸気の乾き度が急激に低
下する。その結果、過熱蒸気は伝熱管＋１１の入口に近
い部分で飽和蒸気となる。なお、フィン部（３）の長さ
を過熱蒸気の乾き度に応じて適当に選定することにより
、平滑部（Ｂｌに流れる蒸気を飽和蒸気にすることが可
能である。Next, an example of operation will be explained when highly dry steam, that is, superheated steam, flows into the heat transfer tube (11) having such a configuration.On the inlet side of the heat transfer tube il+, the heat transfer area inside the tube is formed to be wide. As a result, a large amount of the sensible heat of the superheated steam is transferred to the outside of the tube at the inlet side of the tube, and the dryness of the superheated steam decreases rapidly.As a result, the superheated steam becomes saturated steam near the inlet of the heat transfer tube +11. By appropriately selecting the length of the fin portion (3) depending on the dryness of the superheated steam, it is possible to make the steam flowing into the smooth portion (Bl) saturated steam.
また、この伝熱管（１）のフィン（２）、（２）・・・
は、管軸に沿って長手方向へ平行に形成されているので
、蒸気の流れの案内機能も有している。そのため、蒸気
の流れが良好となる。さらにまた、フィン（２）、（２
）・・・の高さが管の出口側へ向って次第に低くなるよ
うに形成され、管の断面が次第に広くなって流れの抵抗
が小さくなるので、流れの悪化も防止される。Also, the fins (2), (2) of this heat exchanger tube (1)...
Since they are formed parallel to the longitudinal direction along the tube axis, they also have the function of guiding the flow of steam. Therefore, the flow of steam becomes good. Furthermore, fins (2), (2
)... is formed so that its height gradually decreases toward the outlet side of the tube, and the cross section of the tube gradually becomes wider, reducing flow resistance, thereby preventing deterioration of the flow.
このように、伝熱管（１）へ流入した過熱蒸気はフィン
部（３）を流れる間に飽和蒸気となり、その潜熱が管の
大部分を占める平滑部ｒＢｌにおいて管外へ伝わるので
、伝熱管（１）の性能が十分に発揮される。In this way, the superheated steam that has flowed into the heat exchanger tube (1) becomes saturated steam while flowing through the fin section (3), and its latent heat is transferred to the outside of the tube in the smooth section rBl that occupies most of the tube. The performance of 1) is fully demonstrated.
なお、潜熱の熱移動量は顕熱のそれにくらべて桁違いに
大きいので、潜熱による熱移動の部分が多い程、伝熱管
の性能が高まることになる。In addition, since the amount of heat transfer of latent heat is an order of magnitude larger than that of sensible heat, the performance of the heat exchanger tube increases as the amount of heat transfer due to latent heat increases.
なお、実施例においては、管にフィン部（Ａｌと平滑部
ＩＢＩとで構成したものを示したが、管の全長にわたっ
てフィンを形成するようにしても良い。In the embodiment, the tube is shown as having a fin section (Al and a smooth section IBI), but the fins may be formed over the entire length of the tube.
（ト）発明の効果
以上のとおり、本発明によれば、管内に乾き度の高い蒸
気が流入する場合にも、これを入口に近い部分で飽和蒸
気にすることが容易であり、かつ、管内の流れも良好に
保ち得るので、この種の伝熱管の性能が十分に発揮され
る効果をもたらす。(G) Effects of the Invention As described above, according to the present invention, even when highly dry steam flows into the pipe, it is easy to make it saturated steam at a portion near the inlet, and Since the flow of the heat exchanger tube can also be maintained well, the performance of this type of heat exchanger tube can be fully exhibited.
第１図は本発明による伝熱管の一実施例を示した正面図
、第２図は第１図に示した伝熱管の斜視図である。
（１）・・・伝熱管、＋２１・・・フィン、 （３）・
・・フィン部、（Ｂｌ・・・平滑部。FIG. 1 is a front view showing one embodiment of the heat exchanger tube according to the present invention, and FIG. 2 is a perspective view of the heat exchanger tube shown in FIG. 1. (1)...heat exchanger tube, +21...fin, (3)・
...Fin part, (Bl...Smooth part.
Claims (1)
長手方向へ平行に延びる複数本のフィンを管内面に設け
、かつ、これらフィンの高さが管の入口側から出口側へ
向って次第に低くなるようにフィンを形成したことを特
徴とする伝熱管。(1) The inside of the pipe is a flow path for phase-changing fluid, and multiple fins extending parallel to the longitudinal direction along the pipe axis are provided on the inner surface of the pipe, and the height of these fins is from the inlet side to the outlet side of the pipe. A heat exchanger tube characterized in that fins are formed so that they gradually become lower toward the bottom.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10298785A JPS61280392A (en) | 1985-05-15 | 1985-05-15 | Heat transfer tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10298785A JPS61280392A (en) | 1985-05-15 | 1985-05-15 | Heat transfer tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61280392A true JPS61280392A (en) | 1986-12-10 |
Family
ID=14342059
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10298785A Pending JPS61280392A (en) | 1985-05-15 | 1985-05-15 | Heat transfer tube |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61280392A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6470697A (en) * | 1987-09-10 | 1989-03-16 | Dai Ichi High Frequency Co Ltd | Heat transfer tube for condenser |
| JPH05312489A (en) * | 1992-05-01 | 1993-11-22 | Teisan Kk | Evaporator for cold evaporator or pressurized evaporator |
-
1985
- 1985-05-15 JP JP10298785A patent/JPS61280392A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6470697A (en) * | 1987-09-10 | 1989-03-16 | Dai Ichi High Frequency Co Ltd | Heat transfer tube for condenser |
| JPH05312489A (en) * | 1992-05-01 | 1993-11-22 | Teisan Kk | Evaporator for cold evaporator or pressurized evaporator |
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