JPH1172294A - Weld pipe with groove in inner face for heat exchanger for air conditioning - Google Patents

Weld pipe with groove in inner face for heat exchanger for air conditioning

Info

Publication number
JPH1172294A
JPH1172294A JP24780297A JP24780297A JPH1172294A JP H1172294 A JPH1172294 A JP H1172294A JP 24780297 A JP24780297 A JP 24780297A JP 24780297 A JP24780297 A JP 24780297A JP H1172294 A JPH1172294 A JP H1172294A
Authority
JP
Japan
Prior art keywords
groove
grooves
heat exchanger
pipe
air conditioning
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
Application number
JP24780297A
Other languages
Japanese (ja)
Inventor
Hisao Hagiwara
久雄 萩原
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toyo Radiator Co Ltd
Original Assignee
Toyo Radiator Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Toyo Radiator Co Ltd filed Critical Toyo Radiator Co Ltd
Priority to JP24780297A priority Critical patent/JPH1172294A/en
Publication of JPH1172294A publication Critical patent/JPH1172294A/en
Pending legal-status Critical Current

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)

Abstract

PROBLEM TO BE SOLVED: To achieve a relatively small pressure loss of a refrigerant along with a higher heat transfer rate in a weld pipe with a groove in an inner face for a heat exchanger for air conditioning. SOLUTION: More than three slender fine strips 3 divided across the width thereof are arranged on a band-shaped metal plate and a number of inclined grooves 1 are arranged on each of the fine strips 3 side by side askew to the longitudinal direction thereof in such a manner that the inclined grooves 1 are formed opposite in inclination to each other between the adjacent fine strips 3. There are arranged borders 3 of the fine strips which have a parallel vertical groove 4 formed in the longitudinal direction thereof on one hand and no vertical groove of the other and these two borders are alternately formed. A group of V-shaped grooves is formed in V on a plane by a pair of inclined grooves 1 and 1 opposite in the inclination on both sides of the border without groove as imaginary center line.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【発明の属する技術分野】本発明は、内部に気液二相状
態の冷媒が流通する空調用熱交換器の内面溝付き溶接管
に係り、薄い帯状金属板の内面側に多数の溝を並列さ
せ、それを管状に塑性変形して継目を溶接した溶接管に
関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a welded pipe having an inner surface groove of an air conditioning heat exchanger in which a refrigerant in a gas-liquid two-phase state circulates. The present invention relates to a welded pipe in which the joint is welded by plastically deforming it into a tubular shape.

【０００２】[0002]

【従来の技術】空調用熱交換器は、冷媒が気液二相状態
で流通する管を有し、その管内面に冷媒攪拌用の多数の
溝及び突条を形成したものが提案されている。例えば、
薄い帯状金属板の表面に傾斜する溝を一方向のみ設け、
それを管状に丸め、その継目を溶接固定したもの、ある
いは多数の傾斜溝を帯状金属板の中心線に対して対称に
形成し、それを管状に丸めて溶接したもの等が知られて
いる。内面溝付き管は、溝なし管に比べて冷媒側の熱伝
達率を向上することが認められているが、さらに熱伝達
率の良いものが求められていた。2. Description of the Related Art A heat exchanger for air conditioning has been proposed which has a pipe through which a refrigerant flows in a gas-liquid two-phase state, and has a plurality of grooves and ridges for stirring the refrigerant on the inner surface of the pipe. . For example,
Grooves are provided in only one direction on the surface of the thin metal strip,
It is known that it is rolled into a tube and its joint is fixed by welding, or that a number of inclined grooves are formed symmetrically with respect to the center line of the strip-shaped metal plate, which is rolled into a tube and welded. It has been recognized that the inner grooved tube improves the heat transfer coefficient on the refrigerant side as compared with the grooveless tube, but a tube with a better heat transfer coefficient has been required.

【０００３】本発明者は既に、管内面の傾斜溝に加えて
さらに管の軸線に平行な縦溝が有効であることを提案し
ている。これは図７に示す如く、薄い帯状金属板にその
幅方向に互いに平行な多数の縦溝４を形成すると共に、
各縦溝４間に傾斜溝１を設け、隣り合う傾斜溝１が互い
に逆傾斜に形成されたものである。そして、縦溝４の深
さを傾斜溝１のそれよりも浅く形成している。そのよう
にすることにより、気液二相状態の冷媒を攪拌しつつ円
滑に流通させて、流通に伴う冷媒の圧力損失を最小限に
抑えつつ、熱伝達率を向上させていた。さらに、縦溝４
の深さを傾斜溝１のそれより浅く形成することにより、
薄い帯状金属板を管状に塑性変形する際に、傾斜溝１の
部分が他の部分より大きく変形することを防止して、管
外周が多角形になることを防ぎ、真円度の高い信頼性の
高い溶接管を提供していた。The present inventor has already proposed that a vertical groove parallel to the axis of the tube is effective in addition to the inclined groove on the inner surface of the tube. As shown in FIG. 7, a plurality of vertical grooves 4 are formed in a thin strip-shaped metal plate in parallel with each other in the width direction.
The inclined grooves 1 are provided between the vertical grooves 4, and the adjacent inclined grooves 1 are formed so as to be opposite to each other. Further, the depth of the vertical groove 4 is formed shallower than that of the inclined groove 1. By doing so, the refrigerant in the gas-liquid two-phase state is smoothly circulated while stirring, and the heat transfer coefficient is improved while minimizing the pressure loss of the refrigerant accompanying the circulation. Furthermore, the flute 4
Is formed shallower than that of the inclined groove 1,
When the thin strip-shaped metal plate is plastically deformed into a tube, the portion of the inclined groove 1 is prevented from being deformed more than the other portions, and the outer periphery of the tube is prevented from being polygonal. Of high-quality welded pipes.

【０００４】[0004]

【発明が解決しようとする課題】従来の空調用熱交換器
の内面溝付き溶接管及び本発明者が既に提案している溶
接管の熱伝達率をさらに向上させると共に、冷媒の流通
に伴うその圧力損失の少ないものが求められている。そ
こで本発明者はさらに各種実験研究の結果、次の溶接管
を提案する。The heat transfer coefficient of a conventional welded pipe with an inner groove and a welded pipe already proposed by the inventor of the present invention is further improved, and the heat transfer rate of the heat pipe for air conditioning heat exchangers is increased. What has low pressure loss is demanded. The inventor further proposes the following welded pipe as a result of various experimental studies.

【０００５】[0005]

【課題を解決するための手段】本発明の空調用熱交換器
の内面溝付き溶接管は、帯状金属板の内面側に多数の溝
が並列され、その幅方向に湾曲された両縁２が互いに液
密に溶接固定されてなる空調用熱交換器の内面溝付き溶
接管において、前記帯状金属板に、その幅方向に分割さ
れた４以上の細長い細区分帯３，３が設けられ、各細区
分帯３の夫々に、その長手方向に対して斜めに多数の傾
斜溝１が並列され、且つ隣り合う細区分帯３の各傾斜溝
１が逆傾斜に形成され、各細区分帯３の境には前記長手
方向に平行な縦溝４が形成されたものと、縦溝なしのも
のとが交互に形成されて、その溝なしの境を仮想中心線
としてその両側に前記逆傾斜による一対の傾斜溝１，１
により平面Ｖ字状のＶ字溝群が形成されたことを特徴と
するものである。According to the present invention, a plurality of grooves are arranged in parallel on the inner surface side of a strip-shaped metal plate, and both edges 2 which are curved in the width direction are provided. In an inner grooved welded pipe of an air conditioner heat exchanger which is welded and fixed to each other in a liquid-tight manner, the strip-shaped metal plate is provided with four or more elongated narrow strips 3, 3 divided in the width direction thereof. In each of the subdivision zones 3, a large number of inclined grooves 1 are arranged obliquely with respect to the longitudinal direction, and each of the inclined grooves 1 of the adjacent subdivision zones 3 is formed with a reverse inclination. At the boundary, a vertical groove 4 parallel to the longitudinal direction is formed, and a vertical groove 4 is formed alternately. The pair without the groove is formed as a virtual center line on both sides thereof by the reverse inclination. Inclined grooves 1, 1
Thus, a V-shaped groove group having a flat V-shape is formed.

【０００６】この溶接管は、各細区分帯３の境に縦溝４
が形成されたものと、それのないものとが交互に形成さ
れている。そのため、傾斜溝１が存在する部分とそれが
存在しない部分とで、特に気液二相状態の冷媒の液相部
分の流れに変化が生じ、全体として液相部分が攪拌され
て周方向に広がり、管内面における液相の濡れ面積を拡
大して、熱伝達率を向上させる。しかも、縦溝４の存在
する部分とそれが存在しない部分とが交互に形成されて
いるから、縦溝４の存在しない部分における圧力損失の
増大はそれほど大きくならず、実用性の高い空調用熱交
換器の内面溝付き溶接管を提供できる。[0006] This welded pipe has a vertical groove 4
Are formed alternately with those without. Therefore, the flow of the liquid-phase portion of the refrigerant in the gas-liquid two-phase state changes particularly between the portion where the inclined groove 1 exists and the portion where the inclined groove 1 does not exist, and the liquid phase portion is agitated as a whole and spreads in the circumferential direction. In addition, the wet area of the liquid phase on the inner surface of the tube is enlarged to improve the heat transfer coefficient. Moreover, since the portions where the vertical grooves 4 exist and the portions where the vertical grooves 4 do not exist are formed alternately, the increase in the pressure loss in the portion where the vertical grooves 4 do not exist does not increase so much, and the heat for air conditioning which is highly practical is high. It is possible to provide a welded pipe having an inner surface groove of the exchanger.

【０００７】請求項２記載の本発明は、前記請求項１記
載の発明の好ましい実施の形態であって、前記縦溝４の
深さが前記傾斜溝１のそれよりも浅く形成され、管断面
外周が円形に形成された空調用熱交換器の内面溝付き溶
接管である。このように構成することにより、薄い帯状
金属板を管状に塑性変形する際に、縦溝４の部分が他に
部分より大きく変形することを防止して、管外周が多角
形になることを防ぎ、真円度の高い信頼性の高い溶接管
を提供できる。The present invention according to claim 2 is a preferred embodiment of the invention according to claim 1, wherein the depth of the vertical groove 4 is formed shallower than that of the inclined groove 1, and It is a welded pipe with an inner surface groove of an air conditioner heat exchanger whose outer periphery is formed in a circular shape. With this configuration, when the thin strip-shaped metal plate is plastically deformed into a tube, the portion of the vertical groove 4 is prevented from being deformed more than the other portions, and the outer periphery of the tube is prevented from being polygonal. A highly reliable welded pipe with high roundness can be provided.

【０００８】[0008]

【発明の実施の形態】次に、図面に基づいて本発明の各
実施の形態につき説明する。図１は本発明の第１の実施
の形態を示す一部展開図、図２は図１のII部拡大斜視
図、図３は図１の III部拡大斜視図、図４は図３の端面
図である。この溶接管９は、薄い帯状の銅板の内面側
に、その幅方向に分割されて６つの細長い細区分帯３，
３が設けられ、各細区分帯３の夫々に長手方向に対して
斜めに多数の傾斜溝１が並列されている。隣り合う各細
区分帯３の傾斜溝１は、逆向きに傾斜されている。そし
て各細区分帯３の境には、長手方向に平行な縦溝４が形
成されたものと、それの存在しないものとが幅方向に交
互に配置されている。その結果、溝なしの境を仮想中心
として、その両側に逆傾斜による一対の傾斜溝１，１に
より平面Ｖ字状のＶ字溝群が形成される。Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a partially developed view showing a first embodiment of the present invention, FIG. 2 is an enlarged perspective view of a part II in FIG. 1, FIG. 3 is an enlarged perspective view of a part III in FIG. 1, and FIG. FIG. This welded pipe 9 is divided into six thin and narrow strips 3 on the inner surface side of a thin strip-shaped copper plate in the width direction thereof.
3 are provided, and a large number of inclined grooves 1 are arranged in parallel with each of the subdivided bands 3 at an angle to the longitudinal direction. The inclined groove 1 of each adjacent subdivided band 3 is inclined in the opposite direction. At the boundaries between the subdivided bands 3, those formed with vertical grooves 4 parallel to the longitudinal direction and those not provided are alternately arranged in the width direction. As a result, a plane V-shaped V-shaped groove group is formed on both sides of the boundary with no groove as a virtual center by a pair of inclined grooves 1 and 1 by reverse inclination.

【０００９】次に縦溝４は、図３及び図４に示す如く、
その深さが傾斜溝１のそれよりも浅く形成されている。
さらに、縦溝４の側壁部６の先端から傾斜溝群に向かっ
て先下がりとなるスロープ面７が形成されている。この
スロープ面７の傾斜角度は１０度前後としている。なお
この例では、管の平均肉厚は0.25〜0.5mm 程度であり、
縦溝４の深さは傾斜溝１の深さの３／４〜１／２程度で
ある。また、縦溝４の幅方向両側の側壁部６の高さは0.
03〜0.05mm程である。薄い帯状の銅板に予めこのような
各溝を溝成形ローラ等で形成しておき、次いでその帯状
銅板を次第に断面円形に形成し、その境目を電気溶接に
より接合固定して本溶接管９を完成するものである。Next, as shown in FIG. 3 and FIG.
The depth is formed shallower than that of the inclined groove 1.
Further, a slope surface 7 is formed, which descends from the tip of the side wall portion 6 of the vertical groove 4 toward the inclined groove group. The slope angle of the slope surface 7 is about 10 degrees. In this example, the average wall thickness of the tube is about 0.25 to 0.5 mm,
The depth of the vertical groove 4 is about ／ to の of the depth of the inclined groove 1. The height of the side wall portions 6 on both sides in the width direction of the vertical groove 4 is 0.
It is about 03-0.05mm. Such grooves are formed in advance in a thin band-shaped copper plate with a groove forming roller or the like, and then the band-shaped copper plate is gradually formed into a circular cross section, and the boundary is joined and fixed by electric welding to complete the main welded pipe 9. Is what you do.

【００１０】[0010]

【実施例】次に本発明の一実施例につき説明すると、外
径が７mmで平均肉厚が0.31mmのヒートポンプ型空調用熱
交換器の冷媒管において、各傾斜溝１のリード角α（図
１）は１８度で、その傾斜溝１の深さｈ2 ＝0.17mm（図
４）であり、図１に示す如く周方向に６分割され、夫々
傾斜溝１は互いに逆向きに配置されている。そして軸に
直角な横断面において、傾斜溝１の数は４８本である。
また、互いに逆向きに配置された傾斜溝１の境目には縦
溝４が形成されているものと、それがないものとが存在
する。縦溝４は、その幅Ｗが0.03〜0.05mmである。さら
にスロープ面７の幅は0.5mm である。また、傾斜溝１の
溝底の肉厚ｈ1は0.25mm、縦溝４の溝底の肉厚ｈ3 は0.2
8mm、側壁部６の高さｈ4 は0.03mm〜0.05mmである。A description will now be given of one embodiment of the present invention. In a refrigerant pipe of a heat pump type air conditioning heat exchanger having an outer diameter of 7 mm and an average thickness of 0.31 mm, a lead angle α of each inclined groove 1 (see FIG. 1) is 18 degrees, and the depth h 2 of the inclined groove 1 is 0.17 mm (FIG. 4). As shown in FIG. 1, the inclined groove 1 is divided into six in the circumferential direction, and the inclined grooves 1 are arranged in opposite directions to each other. I have. And in the cross section perpendicular to the axis, the number of the inclined grooves 1 is 48.
In addition, some vertical grooves 4 are formed at the boundaries between the inclined grooves 1 arranged opposite to each other, while others do not. The vertical groove 4 has a width W of 0.03 to 0.05 mm. Further, the width of the slope surface 7 is 0.5 mm. Further, the thickness h 1 of the groove bottom of the inclined groove 1 is 0.25 mm, the thickness h 3 of the groove bottom of the circumferential groove 4 0.2
8 mm, the height h 4 of the side wall portion 6 is 0.03Mm～0.05Mm.

【００１１】[0011]

【性能比較】次に、図１における溶接管と、図７に示す
溶接管との比較実験を行ってみた。両溶接管の違いは、
図１の本発明の溶接管では縦溝４が各溝群の境目におい
てひとつおきに存在するが、図７では全ての境に存在す
る点のみである。その比較実験の結果は下表の通りであ
る。[Comparison of Performance] Next, a comparison experiment was performed between the welded pipe shown in FIG. 1 and the welded pipe shown in FIG. The difference between the two welded tubes is
In the welded pipe of the present invention shown in FIG. 1, the vertical grooves 4 are present at every other boundary of each groove group, but in FIG. 7, only the points exist at all the boundaries. The results of the comparative experiment are shown in the table below.

【００１２】[0012]

【表１】 [Table 1]

【００１３】その結果、本発明の溶接管は凝縮器及び蒸
発器の何れにおいても熱伝達率が、１５〜２０％向上す
ると共に、冷媒の圧力損失は５％多くなった。その結
果、熱伝達率の向上が圧力損失の増大の欠点を上回り、
全体として実用性の高い溶接管となっている。As a result, in the welded pipe of the present invention, the heat transfer coefficient in both the condenser and the evaporator was improved by 15 to 20%, and the pressure loss of the refrigerant was increased by 5%. As a result, the improvement in heat transfer coefficient outweighs the disadvantage of increasing pressure loss,
It is a highly practical welded pipe as a whole.

【００１４】上記実験例の溶接管を凝縮器として熱交換
器に用いた条件は、入口空気の乾球温度が３５度で湿球
温度が２４度である。また凝縮器の入口圧は20.8Kg／cm
2 Ｇであり、過熱度は25deg 、過冷却度は5deg、ファン
流速は1.0m／s とした。そして、図７の溶接管の熱交換
量及び冷媒圧損を夫々 100としたときの図１に示す溶接
管の熱伝達率及び冷媒圧損を記録した。なお、冷媒流通
方向は図１においてＡの場合と、その逆の場合とを行っ
た。その結果、熱伝達率については両者はほとんど差が
なかったが、圧力損失ではＡ方向の方がそれと逆方向よ
りも１％程度損失が少なかった。本発明の図１における
溶接管を蒸発器として熱交換器性能試験を行ったときの
実験条件は次の通りである。入口空気の乾球温度が２７
度で湿球温度が１９度である。また蒸発器の出口圧は管
内圧が 5.4Kg／cm2 Ｇであり、過熱度は5deg、過冷却度
は5deg、ファン流速は0.8m／s である。何れにしても、
本発明の溶接管は冷媒の圧力損失を上回る熱伝達率の向
上が実験により判明した。その理由は明確でないが、後
述する発明の作用の如く推測できる。The conditions for using the welded tube of the above experimental example as a condenser in a heat exchanger are that the dry air temperature of the inlet air is 35 ° C. and the wet bulb temperature is 24 ° C. The inlet pressure of the condenser is 20.8kg / cm
2 G, the degree of superheat was 25 deg, the degree of supercooling was 5 deg, and the fan flow rate was 1.0 m / s. Then, the heat transfer coefficient and the refrigerant pressure loss of the welded pipe shown in FIG. 1 when the heat exchange amount and the refrigerant pressure loss of the welded pipe of FIG. In addition, the refrigerant | coolant circulation direction performed the case of A in FIG. 1, and the reverse case. As a result, there was almost no difference between the two in terms of the heat transfer coefficient, but the pressure loss was smaller by about 1% in the direction A than in the opposite direction. Experimental conditions when a heat exchanger performance test was performed using the welded pipe in FIG. 1 of the present invention as an evaporator are as follows. Inlet air dry bulb temperature of 27
The wet bulb temperature is 19 degrees Celsius. The outlet pressure of the evaporator is 5.4 kg / cm 2 G, the degree of superheat is 5 degrees, the degree of supercooling is 5 degrees, and the fan flow rate is 0.8 m / s. In any case,
Experiments have shown that the heat transfer coefficient of the welded pipe of the present invention exceeds the pressure loss of the refrigerant. Although the reason is not clear, it can be inferred as in the operation of the invention described later.

【００１５】次に図５は、本発明の他に実施の形態であ
り、この例が図１のそれと異なる点は、細区分帯３が周
方向に４分割され、それらの境目に２本の縦溝４が形成
されている。次に図６は、本発明の他の実施の形態であ
り、この例が図５のそれと異なる点は、細区分帯３の境
目に１本の縦溝４が形成されている点である。Next, FIG. 5 shows another embodiment of the present invention. This embodiment is different from that of FIG. 1 in that the subdivision zone 3 is divided into four parts in the circumferential direction, and two parts are provided at the boundary. A vertical groove 4 is formed. Next, FIG. 6 shows another embodiment of the present invention. This example is different from that of FIG. 5 in that one vertical groove 4 is formed at the boundary of the subdivision zone 3.

【００１６】[0016]

【発明の作用・効果】本発明の空調用熱交換器の内面溝
付き溶接管は、各細区分帯３の境に長手方向に平行な縦
溝４が形成されたものと、それのないものとが交互に形
成されたので、気液二相状態で管内を流通する冷媒は、
その液相部分が傾斜溝１に沿って斜めに流通するとき、
縦溝４に導かれた液と、縦溝４の存在しない部分の液と
では、互いに流通速度が異なり、その結果管内面におけ
る各部分の液相間に引っ張り及び圧縮が生じ、その結果
全体として液相の攪拌が行われ、熱伝達性能が向上す
る。According to the present invention, the welded pipe with an inner surface groove of the heat exchanger for air conditioning according to the present invention has a vertical groove 4 formed in the longitudinal direction at the boundary of each subdivision zone 3 and a pipe without the vertical groove 4. Are formed alternately, the refrigerant flowing in the pipe in a gas-liquid two-phase state is:
When the liquid phase portion flows obliquely along the inclined groove 1,
The liquid flowing into the vertical groove 4 and the liquid in the portion where the vertical groove 4 does not exist have different flow speeds, and as a result, tension and compression occur between the liquid phases of the respective portions on the inner surface of the pipe, and as a result, as a whole, The liquid phase is stirred, and the heat transfer performance is improved.

【図面の簡単な説明】[Brief description of the drawings]

【図１】本発明の空調用熱交換器の内面溝付き溶接管の
一部展開正面図。FIG. 1 is a partially developed front view of a welded pipe with an inner groove of an air conditioner heat exchanger of the present invention.

【図２】図１のII部拡大斜視図。FIG. 2 is an enlarged perspective view of a portion II in FIG.

【図３】図１の III部拡大斜視図。FIG. 3 is an enlarged perspective view of a part III in FIG. 1;

【図４】図３の端面図。FIG. 4 is an end view of FIG. 3;

【図５】本発明の第２の例を示す溶接管の一部展開正面
図。FIG. 5 is a partially developed front view of a welded pipe showing a second example of the present invention.

【図６】本発明の第３の例を示す溶接管の一部展開正面
図。FIG. 6 is a partially developed front view of a welded pipe showing a third example of the present invention.

【図７】従来の空調用熱交換器の内面溝付き溶接管の一
部展開正面図。FIG. 7 is a partially developed front view of a welded pipe with an inner surface groove of a conventional heat exchanger for air conditioning.

【符号の説明】[Explanation of symbols]

１ 傾斜溝 ２ 縁 ３ 細区分帯 ４ 縦溝 ５ 突条 ６ 側壁部 ７ スロープ面 ８ 溶接部 ９ 溶接管 DESCRIPTION OF SYMBOLS 1 Inclined groove 2 Edge 3 Subdivided zone 4 Vertical groove 5 Ridge 6 Side wall 7 Slope face 8 Welded part 9 Welded pipe

Claims (2)

【特許請求の範囲】[Claims] 【請求項１】 帯状金属板の内面側に多数の溝が並列さ
れ、その幅方向に湾曲された両縁２が互いに液密に溶接
固定されてなる空調用熱交換器の内面溝付き溶接管にお
いて、 前記帯状金属板に、その幅方向に分割された４以上の細
長い細区分帯３，３が設けられ、 各細区分帯３の夫々に、その長手方向に対して斜めに多
数の傾斜溝１が並列され、且つ隣り合う細区分帯３の各
傾斜溝１が逆傾斜に形成され、 各細区分帯３の境には前記長手方向に平行な縦溝４が形
成されたものと、縦溝なしのものとが交互に形成され
て、その溝なしの境を仮想中心線としてその両側に前記
逆傾斜による一対の傾斜溝１，１により平面Ｖ字状のＶ
字溝群が形成されたことを特徴とする空調用熱交換器の
内面溝付き溶接管。1. A grooved inner pipe of an air-conditioning heat exchanger in which a number of grooves are arranged in parallel on the inner surface side of a strip-shaped metal plate, and both edges 2 curved in the width direction are liquid-tightly welded and fixed to each other. In the above-mentioned band-shaped metal plate, four or more elongated narrow division bands 3, 3 divided in the width direction are provided, and each of the narrow division bands 3 has a large number of inclined grooves oblique to the longitudinal direction. 1 are arranged side by side, and each inclined groove 1 of the adjacent subdivided band 3 is formed in a reverse inclination, and a vertical groove 4 parallel to the longitudinal direction is formed at the boundary of each subdivided band 3; The grooves without grooves are alternately formed, and the boundary without the grooves is defined as a virtual center line.
A welded tube with an inner surface groove of a heat exchanger for air conditioning, wherein a group of U-shaped grooves is formed. 【請求項２】 請求項１において、前記縦溝４の深さが
前記傾斜溝１のそれよりも浅く形成され、管断面外周が
円形に形成された空調用熱交換器の内面溝付き溶接管。2. The welded pipe with an inner groove of an air-conditioning heat exchanger according to claim 1, wherein the depth of the vertical groove 4 is formed shallower than that of the inclined groove 1 and the outer circumference of the pipe is circular. .
JP24780297A 1997-08-28 1997-08-28 Weld pipe with groove in inner face for heat exchanger for air conditioning Pending JPH1172294A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP24780297A JPH1172294A (en) 1997-08-28 1997-08-28 Weld pipe with groove in inner face for heat exchanger for air conditioning

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP24780297A JPH1172294A (en) 1997-08-28 1997-08-28 Weld pipe with groove in inner face for heat exchanger for air conditioning

Publications (1)

Publication Number Publication Date
JPH1172294A true JPH1172294A (en) 1999-03-16

Family

ID=17168880

Family Applications (1)

Application Number Title Priority Date Filing Date
JP24780297A Pending JPH1172294A (en) 1997-08-28 1997-08-28 Weld pipe with groove in inner face for heat exchanger for air conditioning

Country Status (1)

Country Link
JP (1) JPH1172294A (en)

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