JP4355294B2 - Enhanced heat exchanger tube with discontinuous bi-directionally inclined internal ribs - Google Patents

Enhanced heat exchanger tube with discontinuous bi-directionally inclined internal ribs Download PDF

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JP4355294B2
JP4355294B2 JP2004571496A JP2004571496A JP4355294B2 JP 4355294 B2 JP4355294 B2 JP 4355294B2 JP 2004571496 A JP2004571496 A JP 2004571496A JP 2004571496 A JP2004571496 A JP 2004571496A JP 4355294 B2 JP4355294 B2 JP 4355294B2
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heat exchange
tube
discontinuous
inclined inner
enhanced heat
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JP2006514733A (en
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グオ，ゼンユアン
メン，ジアン
フー，ウェイリン
リ，ジシン
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Tsinghua University
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    • 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
    • F28F1/42—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being both outside and inside the tubular element
    • F28F1/424—Means comprising outside portions integral with inside portions
    • F28F1/426—Means comprising outside portions integral with inside portions the outside portions and the inside portions forming parts of complementary shape, e.g. concave and convex
    • 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
    • F28F1/42—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being both outside and inside the tubular element

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  • 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)

Description

発明の詳細な説明Detailed Description of the Invention

技術分野
本発明は、不連続の両方向傾斜内部リブ付き増強熱交換管に関し、増強熱交換及び熱交換器の分野に属するものである。 TECHNICAL FIELD The present invention relates to an enhanced heat exchange tube with discontinuous bi-directionally inclined inner ribs and belongs to the field of enhanced heat exchange and heat exchangers.

背景技術
管状の熱交換器は、石油、化工、動力などの多数の分野で広くて大量に応用される。管状の熱交換器は、一般的に平滑で断面円形の管を用い、製造プロセスが簡単で、安全性がよく、コストが低いなどの利点があるが、平滑で断面円形の管の熱交換性能が不足の原因で、普通の管状の熱交換器は、体積が大きくなり、消耗材料が多いなどの欠点がある。このような状況を改変するために、普通の円形管の変わりに、各種の増強熱交換管が開発されて来た。三十年以来、壁面の流れ干渉増強技術に基づき、様々な対流熱交換増強素子が開発された。特に、ローリング工法により得られた表面粗い熱交換管、例えば螺旋状溝付管(spirally grooved tube)、横溝付管(transverse grooved tube)は、工程に広く成功裡に応用された。また、管内インサート（inserts）、例えば、ねじれたテープインサート（twisted-tape inserts）、スプリングインサート（spring inserts）なども広く応用されている。これら熱交換管は、流れ抵抗が大きく、内部リブまたは溝付近の逆流区域に汚れやすく、加工効率が低く、コストが高いという共通の欠点がある。 BACKGROUND ART Tubular heat exchangers are widely applied in large quantities in many fields such as petroleum, chemicals, and power. Tubular heat exchangers generally use smooth and circular cross-section tubes, and have advantages such as a simple manufacturing process, good safety, and low cost, but the heat exchange performance of smooth and circular cross-section tubes Due to the shortage, ordinary tubular heat exchangers have disadvantages such as an increase in volume and a large amount of consumable materials. In order to modify this situation, various types of enhanced heat exchange tubes have been developed instead of ordinary circular tubes. Since 30 years, various convective heat exchange enhancement elements have been developed based on wall flow interference enhancement technology. In particular, rough surface heat exchange tubes obtained by the rolling method, such as spirally grooved tubes and transverse grooved tubes, have been widely and successfully applied to the process. In-pipe inserts, such as twisted-tape inserts, spring inserts, etc. are also widely applied. These heat exchange tubes have the common drawbacks of high flow resistance, easy contamination in the backflow area near the internal ribs or grooves, low processing efficiency, and high cost.

発明の内容
本発明は、管内に不連続で、軸線と所定の角度があって両方向に傾斜するストリップ状の突起、即ち両方向傾斜内部リブを備える新規な増強熱交換管である不連続の両方向傾斜内部リブ付き増強熱交換管（Discrete Bidirectionally Inclined ribs tube、以下、ＤＢＩＲ管と称する）を提供することを目的とする。多数の両方向傾斜内部リブによって、流体は、管内に、特に内面付近に、縦方向の渦巻き及び／または他の方式の管内径方向流れを生じるので、熱交換を顕著に増強させる。これは、「対流熱交換場協同原則」（Guo
Z.Y,Mechanism and Control of Convective Heat Transfer-Coordination of Velocity
and Heat Flow Field,Chinese Science Bulletin, 46(7):596-599 Apr 2001参照）に合致し、即ち、流速場及び温度勾配場の協同程度を高める限り、抵抗の増加が少なくて熱伝達過程をよく増強することができる。「対流熱交換場協同原則」に基づいて管内の流れ及び熱交換を理論的に解析することによって、縦方向の渦巻きは、管内の対流熱交換を増強させる有効な方式である。縦方向の渦巻き及び管内径方向の流れは、一般的に流速場及び温度勾配場の協同程度を顕著に改善させて、管内の対流熱交換過程をよく増強させることができる。本発明におけるＤＢＩＲ管は、螺旋状溝付管、横溝付管、ネジ付管及び粗いリブ付管よりも、乱流及び遷移区域によりよい増強熱交換効果及び低い抵抗損失を有し、従来の技術の欠点を克服または補うことができる。 SUMMARY OF THE INVENTION The present invention is a discontinuous bi-directional tilt that is a new enhanced heat exchange tube that is discontinuous in the tube and has a predetermined angle with the axis and tilts in both directions, i.e., a bi-directionally inclined internal rib. An object is to provide an enhanced heat exchange tube with internal ribs (Discrete Bidirectionally Inclined ribs tube, hereinafter referred to as DBIR tube). With a large number of bi-directionally inclined internal ribs, the fluid significantly enhances heat exchange as it creates longitudinal vortices and / or other types of internal tube flow in the tube, particularly near the inner surface. This is the “Cooperation Principle of the Convection Heat Exchange” (Guo
ZY, Mechanism and Control of Convective Heat Transfer-Coordination of Velocity
and Heat Flow Field, Chinese Science Bulletin, 46 (7): 596-599 Apr 2001), that is, as long as the cooperation between the flow velocity field and the temperature gradient field is increased, the increase in resistance is small and the heat transfer process is reduced. Can strengthen well. Longitudinal spirals are an effective way to enhance convective heat exchange in a tube by theoretically analyzing the flow and heat exchange in the tube based on the “convective heat exchange field cooperative principle”. Longitudinal vortices and tube bore flow generally can significantly improve the co-ordination of flow velocity and temperature gradient fields and can enhance the convective heat exchange process in the tube well. The DBIR tube in the present invention has a better enhanced heat exchange effect and lower resistance loss in the turbulent flow and transition zone than the spiral grooved tube, transverse grooved tube, threaded tube and rough ribbed tube. The drawbacks of can be overcome or compensated.

本発明は、管軸線に対して垂直な平面で切断した断面の形状が円形である前記増強熱交換管の内面に、不連続で管軸線と所定の角度を有して両方向に傾斜するストリップ状の突起である両方向傾斜内部リブ、即ち左旋方向傾斜内部リブ及び右旋方向傾斜内部リブを備える。両方向傾斜内部リブは、突起に対応する溝が増強熱交換管の外周面に形成されている。左旋方向傾斜内部リブは、管軸線の延びる方向に沿って間隔をあけて連続して設けられる。右旋方向傾斜内部リブは、管軸線の延びる方向に沿って間隔をあけて連続して設けられる。さらに、左旋方向傾斜内部リブと右旋方向傾斜内部リブとが、増強熱交換管の周方向に沿って交互に設けられる。前記両方向傾斜内部リブは、その高さが０．２ｄ以下、周方向幅が０．５ｄ以下、長さが２ｄ以下であり（前記ｄは、前記管の流体力学の内径である）、周方向に隣接する左旋方向傾斜内部リブと右旋方向傾斜内部リブとから成る傾斜リブ対が、増強熱交換管内を流れる流体に対して縦方向の渦巻きを生ずる渦発生器を構成している。さらに、両方向傾斜内部リブの軸線と管軸線との間の角度は±（４５〜５０）度である（「＋」が左旋方向傾斜、「−」が右旋方向傾斜を示す）ことを特徴とする不連続の両方向傾斜内部リブ付き増強熱交換管である。 The present invention provides a strip-like shape which is discontinuous and has a predetermined angle with the pipe axis and is inclined in both directions on the inner surface of the enhanced heat exchange pipe having a circular cross-sectional shape cut along a plane perpendicular to the pipe axis. Bi-directionally inclined internal ribs, that is, left-handed inclined inner ribs and right-handed inclined inner ribs. In the bidirectionally inclined inner rib, a groove corresponding to the protrusion is formed on the outer peripheral surface of the enhanced heat exchange tube. The left-handed inclined inner ribs are continuously provided at intervals along the direction in which the tube axis extends. The right-handed inclined internal ribs are continuously provided at intervals along the direction in which the tube axis extends. Furthermore, the left-handed inclined inner ribs and the right-handed inclined inner ribs are alternately provided along the circumferential direction of the enhanced heat exchange tube. The bi-directional tilt inner ribs, the height is 0.2d or less, the circumferential width of 0.5d or less, der Ri less length 2d (the d is the inner diameter of the fluid dynamics of the tube), the circumferential A pair of inclined ribs composed of a left-handed inclined inner rib and a right-handed inclined inner rib adjacent to each other constitute a vortex generator that generates a longitudinal vortex for the fluid flowing in the enhanced heat exchange tube. Further, the angle between the axis of the bi-directionally inclined inner rib and the tube axis is ± (45 to 50) degrees (“+” indicates a left-handed direction inclination and “−” indicates a right-handed direction inclination). It is an enhanced heat exchange tube with discontinuous bi-directionally inclined inner ribs.

前記両方向傾斜内部リブの断面形状は、円弧形、矩形、三角形、扇形、流線形、幾つの曲線及び直線からなる任意の形状の一種または数種の組合せであることが好ましい。   The cross-sectional shape of the bi-directionally inclined inner rib is preferably one or a combination of arbitrary shapes consisting of an arc, rectangle, triangle, fan, streamline, several curves and straight lines.

前記両方向傾斜内部リブの軸線は、直線、折線、キャンバー、スパイラル線及び曲線の任意の一種または数種の組合せであることが好ましい。   The axis of the bi-directionally inclined inner rib is preferably any one kind or a combination of several kinds of straight lines, broken lines, cambers, spiral lines and curves.

前記増強熱交換管の内面は、平滑な表面及び低いリブ付表面の任意の一種または数種の組合せであることが好ましい。 The inner surface of the enhanced heat exchange tubes is preferably any one or several combinations of smooth table Men及 beauty lower ribbed surface.

前記増強熱交換管の外面は、溝付表面、平滑な表面、低いリブ付表面及びひれ付表面の任意の一種または数種の組合せであることが好ましい。 It said outer surface of enhanced heat exchanger tubes, grooved surface, a smooth front surface is preferably any one or several combinations of lower ribbed surface and fins with the surface.

従来の技術と比べると、本発明は、増強熱伝達効果が顕著で、流れ抵抗が小さく、成形が簡単と言う利点がある。実施例１〜３の発明は、普通の円形管と比べると、乱流に対しては、一般的に熱伝達係数を８０〜１５０％向上し、熱伝達効果のよい横溝付管よりも３０％向上して流れ抵抗を２０〜５０％低下し、遷移区域対流熱交換については、その増強熱交換効果も顕著であるので、重要な工程実用価値がある。又、横溝付管及びネジリブ付管と比べると、本発明の両方向傾斜内部リブ付近に逆流（横方向の渦巻き）を生じにくく、管内に流れない領域がないことによって、よい汚れ防止効果がある。   Compared with the prior art, the present invention has the advantage that the enhanced heat transfer effect is remarkable, the flow resistance is small, and the molding is simple. The inventions of Examples 1 to 3 generally improve the heat transfer coefficient by 80 to 150% against turbulent flow compared to ordinary circular tubes, and 30% more than the lateral grooved tube having a good heat transfer effect. The flow resistance is improved by 20 to 50%, and the transition zone convection heat exchange has an important process practical value because its enhanced heat exchange effect is also remarkable. Further, as compared with a tube with a lateral groove and a tube with a threaded rib, a backflow (a lateral spiral) hardly occurs in the vicinity of the bi-directionally inclined inner rib of the present invention, and there is no region that does not flow in the tube, thereby providing a good antifouling effect.

発明の実施の形態
不連続の両方向傾斜内部リブ付き増強熱交換管は、熱交換管の内面に、不連続で軸線と所定の角度があって両方向に傾斜するストリップ状の突起である両方向傾斜内部リブを複数設置したものである。両方向傾斜内部リブは、一般的に、その高さが０．２ｄ以下、周方向幅が０．５ｄ以下、長さが２ｄ以下である（ｄは、前記管の流体力学の内径である）。「不連続」とは、螺旋状溝付管（螺旋連続）、ネジ付管（ネジ連続）、横溝付管（周方向連続）に対し、所定の長さを有する粗面のもの（ストリップ状の突起）である。不連続の両方向傾斜内部リブ付き増強熱交換管は、普通の円形管、低いリブ付管またはネジ付管をモールディングまたはローリングにより製造し、または継目なし管をローリングする時に成形され、または継ぎ目管を溶接する時に成形されてもよい。管内の流体は、管壁にある複数の両方向傾斜内部リブにより複数の縦方向の渦巻き及び／または他の２次流れを生じ、且つ、渦巻き及び／または他の２次流れが管壁面付近に集中することによって、乱流熱交換及び遷移区域の対流熱交換の過程がよく増加される効果を果たす。 BEST MODE FOR CARRYING OUT THE INVENTION A discontinuous bi-directionally inclined internal ribbed enhanced heat exchange tube is a bi-directionally inclined interior that is a strip-like protrusion that is discontinuous and has a predetermined angle with an axis on the inner surface of the heat exchange tube. A plurality of ribs are installed. The bi-directionally inclined inner rib generally has a height of 0.2 d or less, a circumferential width of 0.5 d or less, and a length of 2 d or less (d is the hydrodynamic inner diameter of the tube). “Discontinuous” refers to a rough surface (strip-shaped) having a predetermined length with respect to a spiral grooved tube (helical continuous), a threaded tube (screw continuous), and a lateral grooved tube (circumferential continuous). Projection). Discontinuous bi-directionally inclined internal ribbed augmented heat exchange tubes are formed when molding ordinary round tubes, low ribbed tubes or threaded tubes by molding or rolling, or rolling seamless tubes. It may be formed when welding. The fluid in the tube causes a plurality of longitudinal spirals and / or other secondary flows due to a plurality of bidirectionally inclined inner ribs on the tube wall, and the spirals and / or other secondary flows are concentrated near the wall of the tube. By doing so, the process of turbulent heat exchange and convective heat exchange in the transition zone is effectively increased.

実施例１
図１は不連続の両方向傾斜内部リブ付き増強熱交換管の構造を示す。この管の内側に不連続の両方向螺旋状突起（不連続の両方向螺旋状内部リブと略する）を備え、管の外側に不連続の両方向螺旋状溝を備える。 Example 1
FIG. 1 shows the structure of an enhanced heat exchange tube with discontinuous bi-directionally inclined internal ribs. A discontinuous bidirectional spiral protrusion (abbreviated as discontinuous bidirectional spiral inner rib) is provided inside the tube, and a discontinuous bidirectional spiral groove is provided outside the tube.

図１及び図２において、符号１は管の内側の不連続の両方向螺旋状リブ、符号２は管の外側の不連続の両方向螺旋状溝を示す。螺旋状リブ及び螺旋状溝は、加工中に同時に形成されたものである。図１における符号ｄは熱交換管の流体力学の内径、符号Ｐはそれぞれの両方向傾斜内部リブの軸方向の長さ、符号Ｃは両方向傾斜内部リブの螺旋角である。図３において、符号ｈは両方向傾斜内部リブの高さである。Ｐ＝０．３ｄ、ｈ＝０．０５ｄ、Ｃ≒±４５度（正値は右旋、負値は左旋を示す）である。   1 and 2, reference numeral 1 denotes a discontinuous bidirectional spiral rib inside the tube, and reference numeral 2 denotes a discontinuous bidirectional spiral groove outside the tube. The spiral rib and the spiral groove are formed simultaneously during processing. In FIG. 1, the symbol d is the hydrodynamic inner diameter of the heat exchange tube, the symbol P is the axial length of each bidirectionally inclined inner rib, and the symbol C is the spiral angle of the bidirectionally inclined inner rib. In FIG. 3, the symbol h is the height of the bi-directionally inclined inner rib. P = 0.3d, h = 0.05d, C≈ ± 45 degrees (a positive value indicates right-handed rotation and a negative value indicates left-handed rotation).

実施例２
図４は他の不連続の両方向傾斜内部リブ付き増強熱交換管の一部が周方向に展開された構造を示す。この管の内面に不連続の両方向螺旋状突起（両方向傾斜内部リブ）を備え、管の外面は平滑な壁面である。 Example 2
FIG. 4 shows a structure in which a part of another heat dissipating heat exchange pipe with discontinuous bi-directionally inclined inner ribs is developed in the circumferential direction. The inner surface of the tube is provided with discontinuous bidirectional spiral protrusions (bidirectionally inclined inner ribs), and the outer surface of the tube is a smooth wall surface.

図４において、符号３は対称に配置された不連続の両方向螺旋状リブを示す。一つの右旋傾斜リブと、それと周方向に隣接する左旋傾斜リブで一つの渦発生器を構成し、同一の断面において、周方向に沿って四つの傾斜リブで二つの渦発生器を構成する。図４の符号Ｃは両方向傾斜内部リブの弦巻角で、Ｃ≒±５０度（正値は右旋、負値は左旋を示す）であり、同図におけるＣは右旋角である。図４において、符号４は、流体が不連続の両方向螺旋状内部リブによって内面付近に生じた縦方向の渦巻きを概略に示す。両方向傾斜内部リブによる縦方向の渦巻きは主に壁面付近に存在しているので、乱流の場合の熱交換強化の効果に優れた。不連続かつ所定の傾斜角度を有する両方向傾斜内部リブは、流体に横方向の渦巻きを生じさせにくいとともに、管内の流通面積の減少を少なくさせるので、このような管は、螺旋状溝付、横溝付及びネジ付熱交換管より、流れ抵抗がずっと小さい。   In FIG. 4, the code | symbol 3 shows the discontinuous bidirectional spiral rib arrange | positioned symmetrically. One vortex generator and one counterclockwise inclined rib adjacent in the circumferential direction constitute one vortex generator, and two vortex generators are constituted by four inclined ribs along the circumferential direction in the same cross section. . The symbol C in FIG. 4 is the winding angle of the bi-directionally inclined inner rib, and C≈ ± 50 degrees (a positive value indicates right-handed rotation and a negative value indicates left-handed rotation), and C in FIG. In FIG. 4, reference numeral 4 schematically shows a longitudinal spiral generated near the inner surface by a discontinuous bidirectional spiral internal rib. Longitudinal spirals due to the bi-directionally inclined inner ribs are mainly present near the wall surface, so the effect of enhancing heat exchange in the case of turbulent flow is excellent. Bi-directionally inclined internal ribs that are discontinuous and have a predetermined angle of inclination are less likely to cause lateral vortices in the fluid and reduce the reduction of the flow area within the tube. Flow resistance is much smaller than with heat exchanger tubes with screws.

実施例３
図５はさらに他の不連続の両方向傾斜内部リブ付き増強熱交換管の一部が周方向に展開された構造を示す。この管の内面に不連続の両方向螺旋状突起（両方向傾斜内部リブ）を備え、管の外面に不連続の両方向螺旋状溝を備える。 Example 3
FIG. 5 shows a structure in which a part of another intensified heat exchange tube with discontinuous bidirectionally inclined inner ribs is developed in the circumferential direction. A discontinuous bidirectional spiral protrusion (bidirectionally inclined inner rib) is provided on the inner surface of the tube, and a discontinuous bidirectional spiral groove is provided on the outer surface of the tube.

図５において、符号５は、管内に不対称に配置された不連続の両方向螺旋状リブ、符号６は管外に不対称に配置された不連続の両方向螺旋状溝を示す。管内に、一つの右旋傾斜リブと、それと周方向に隣接する左旋傾斜リブで一つの渦発生器を構成し、小さい部分の管（０．５ｄよりも小さい）の内面には、六つの傾斜リブで三つの渦発生器を構成する。   In FIG. 5, reference numeral 5 denotes a discontinuous bi-directional spiral rib disposed asymmetrically in the pipe, and reference numeral 6 denotes a discontinuous bi-directional spiral groove arranged asymmetrically outside the pipe. A vortex generator is composed of one right-handed inclined rib and a left-handed right-hand inclined rib in the pipe, and six inclined parts are formed on the inner surface of a small portion of the pipe (less than 0.5d). Three vortex generators are composed of ribs.

不連続の両方向傾斜内部リブ付き増強熱交換管がローリングまたはモールディングにより成形されることは最適な製造方法である。不連続の管内両方向螺旋状リブ/管外両方向螺旋状溝付き熱交換管のローリング成形プロセスは、ロールの成型表面に不連続の扁平な突起（low-profile protrusions）を設置し、熱交換管がロールでローリングされる場合に、熱交換管の外面が扁平な突起で押し出されて不連続の両方向螺旋状溝に成形され、その管内に不連続の両方向螺旋状リブが成形される。管内に不連続の両方向螺旋状のリブを備えて管の外面が平滑である熱交換管については、その製造プロセスの一つは、管内にネジを備えて管外が平滑である管と類似であり、その製造プロセスのもう一つは、ローリングまたはモールディングにより成形された不連続の管内両方向螺旋状リブ/管外両方向螺旋状溝付き熱交換管を再加工する（冷間引抜など）。不連続の両方向傾斜内部リブ付き増強熱交換管のローリングまたはモールディング成形方法について、通常の螺旋状溝、横溝、ネジ表面付熱交換管より、製造効率が５〜１０倍高く、これは、傾斜リブの不連続による利点であるので、その製造コストもそれに応じて低下される。   It is an optimal manufacturing method that the enhanced heat exchange tube with discontinuous bi-directionally inclined internal ribs is formed by rolling or molding. The rolling process of discontinuous in-tube bi-directional spiral ribs / out-of-tube bi-directional spiral grooved heat exchange tubes involves the installation of discontinuous low-profile protrusions on the roll molding surface, When rolling by a roll, the outer surface of the heat exchange tube is extruded with a flat protrusion and formed into a discontinuous bidirectional spiral groove, and a discontinuous bidirectional spiral rib is formed within the tube. For heat exchange tubes with discontinuous bi-directional helical ribs in the tube and a smooth outer surface of the tube, one of the manufacturing processes is similar to a tube with a screw in the tube and a smooth outer tube One of the manufacturing processes is to rework discontinuous in-tube bi-directional spiral ribs / ex-tube bi-directional spiral grooved heat exchange tubes formed by rolling or molding (such as cold drawing). About the rolling or molding method of the enhanced heat exchange pipe with discontinuous bi-directionally inclined inner ribs, the production efficiency is 5 to 10 times higher than that of ordinary heat exchange pipes with spiral grooves, lateral grooves, and thread surfaces. Manufacturing costs are reduced accordingly.

不連続の両方向傾斜内部リブ付き増強熱交換管の構造の概略図である。It is the schematic of the structure of the reinforcement | strengthening heat exchange pipe | tube with a discontinuous bi-directional inclination internal rib. 図１のＡ−Ａ断面図である。It is AA sectional drawing of FIG. 図２におけるＢ部分の一部拡大図である。FIG. 3 is a partially enlarged view of a portion B in FIG. 2. 他の不連続の両方向傾斜内部リブ付き増強熱交換管の一部が周方向に展開された構造の概略図である。It is the schematic of the structure where a part of augmentation heat exchange pipe | tube with other discontinuous bi-directionally inclined internal ribs was developed in the circumferential direction. さらに他の不連続の両方向傾斜内部リブ付き増強熱交換管の一部が周方向に展開された構造の概略図である。Furthermore, it is the schematic of the structure where a part of augmentation heat exchange pipe | tube with another discontinuous bi-directional inclination internal rib was expand | deployed in the circumferential direction.

Claims (5)

両方向傾斜内部リブを備える不連続の両方向傾斜内部リブ付き増強熱交換管であって、前記増強熱交換管は、増強熱交換管の管軸線に対して垂直な平面で切断した断面の形状が円形であり、前記増強熱交換管の内面に形成される複数の両方向傾斜内部リブは、それぞれ不連続なストリップ状の突起であって、かつその突起に対応する溝が前記増強熱交換管の外周面に形成されている突起であって、前記管軸線に対して所定の角度を有して左旋方向に傾斜する左旋方向傾斜内部リブと前記管軸線に対して所定の角度を有して右旋方向に傾斜する右旋方向傾斜内部リブとを含み、左旋方向傾斜内部リブは、前記管軸線の延びる方向に沿って間隔をあけて連続して設けられ、右旋方向傾斜内部リブは、前記管軸線の延びる方向に沿って間隔をあけて連続して設けられ、左旋方向傾斜内部リブと右旋方向傾斜内部リブとが、前記増強熱交換管の周方向に沿って交互に設けられ、前記各両方向傾斜内部リブは、その高さが０．２ｄ以下、周方向幅が０．５ｄ以下、長さが２ｄ以下であり（前記ｄは、前記管の流体力学の内径である）、周方向に隣接する左旋方向傾斜内部リブと右旋方向傾斜内部リブとから成る傾斜リブ対が、増強熱交換管内を流れる流体に対して縦方向の渦巻きを生ずる渦発生器を構成し、前記両方向傾斜内部リブの軸線と管軸線との間の角度は±（４５〜５０）度であり、「＋」が左旋方向傾斜、「−」が右旋方向傾斜を示すことを特徴とする不連続の両方向傾斜内部リブ付き増強熱交換管。An intensified heat exchange pipe with discontinuous bi-directionally inclined internal ribs having bi-directionally inclined internal ribs, wherein the enhanced heat exchange pipe has a circular cross-sectional shape cut along a plane perpendicular to the tube axis of the enhanced heat exchange pipe The plurality of bi-directionally inclined inner ribs formed on the inner surface of the enhanced heat exchange tube are discontinuous strip-shaped projections, and grooves corresponding to the projections are outer peripheral surfaces of the enhanced heat exchange tube. A protrusion formed in the left-handed direction and having a predetermined angle with respect to the tube axis, and a left-turned inclined inner rib inclined in the left-handed direction; and a right-handed direction with a predetermined angle with respect to the tube axis. A right-handed inclined inner rib, the left-handed inclined inner rib being continuously provided at intervals along the direction in which the tube axis extends, and the right-handed inclined inner rib being the tube axis. Spaced along the direction of the The left-handed inclined inner ribs and the right-handed inclined inner ribs are alternately provided along the circumferential direction of the enhanced heat exchange pipe, and each of the two-way inclined inner ribs has a height of 0. .2d below, the circumferential width of 0.5d or less state, and are the 2d or less in length (the d is the inner diameter of the fluid dynamics of the tube), left-handed circumferentially adjacent direction inclined inner ribs and Migi旋A pair of inclined ribs composed of directional inclined inner ribs constitutes a vortex generator that generates a longitudinal vortex for the fluid flowing in the enhanced heat exchange tube, and the angle between the axis of the bidirectional inclined inner rib and the tube axis Is an enhanced heat exchange tube with discontinuous bi-directionally inclined internal ribs , wherein ± is (45 to 50) degrees, “+” indicates a left-handed inclination and “−” indicates a right-handed inclination . 前記両方向傾斜内部リブの断面形状は、円弧形、矩形、三角形、扇形、流線形、幾つの曲線及び直線からなる任意の形状の一種または数種の組合せであることを特徴とする請求項１記載の不連続の両方向傾斜内部リブ付き増強熱交換管。  2. The cross-sectional shape of the bi-directionally inclined inner rib is one type or a combination of several types of arbitrary shapes consisting of an arc, a rectangle, a triangle, a fan, a streamline, several curves and straight lines. Reinforced heat exchange tube with discontinuous bi-directionally inclined internal ribs as described. 前記両方向傾斜内部リブの軸線は、直線、折線、キャンバー、スパイラル線及び曲線の任意の一種または数種の組合せであることを特徴とする請求項１記載の不連続の両方向傾斜内部リブ付き増強熱交換管。  The enhanced heat with discontinuous bi-directionally inclined inner ribs according to claim 1, wherein the axis of the bi-directionally inclined inner rib is any one or a combination of straight lines, broken lines, cambers, spiral lines and curves. Exchange tube. 前記増強熱交換管の内面は、平滑な表面及び低いリブ付表面の任意の一種または数種の組合せであることを特徴とする請求項１記載の不連続の両方向傾斜内部リブ付き増強熱交換管。  2. The enhanced heat exchange tube with discontinuous bi-directionally inclined inner ribs according to claim 1, wherein the inner surface of the enhanced heat exchange tube is any one or a combination of a smooth surface and a low ribbed surface. . 前記増強熱交換管の外面は、溝付表面、平滑な表面、低いリブ付表面及びひれ付表面の任意の一種であることを特徴とする請求項１に記載の不連続の両方向傾斜内部リブ付き増強熱交換管。  The outer surface of the enhanced heat exchange tube is any one of a grooved surface, a smooth surface, a low ribbed surface, and a finned surface, with discontinuous bi-directionally inclined inner ribs according to claim 1 Enhanced heat exchange tube.
JP2004571496A 2003-05-10 2003-10-27 Enhanced heat exchanger tube with discontinuous bi-directionally inclined internal ribs Expired - Fee Related JP4355294B2 (en)

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