JPH0716740B2 - Shell and tube heat exchanger and method of manufacturing the same - Google Patents
Shell and tube heat exchanger and method of manufacturing the sameInfo
- Publication number
- JPH0716740B2 JPH0716740B2 JP1227998A JP22799889A JPH0716740B2 JP H0716740 B2 JPH0716740 B2 JP H0716740B2 JP 1227998 A JP1227998 A JP 1227998A JP 22799889 A JP22799889 A JP 22799889A JP H0716740 B2 JPH0716740 B2 JP H0716740B2
- Authority
- JP
- Japan
- Prior art keywords
- tube
- shell
- peripheral surface
- hole
- 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.)
- Expired - Lifetime
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
- F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
- F28F9/02—Header boxes; End plates
- F28F9/04—Arrangements for sealing elements into header boxes or end plates
- F28F9/16—Arrangements for sealing elements into header boxes or end plates by permanent joints, e.g. by rolling
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
- F28D7/06—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits having a single U-bend
-
- 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
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Geometry (AREA)
- Details Of Heat-Exchange And Heat-Transfer (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は、シェルアンドチューブ型熱交換器およびその
製造方法に係り、特に、シェルの管板に形成された貫通
孔に嵌着接合されるチューブの接合構造の簡略化対策に
関する。Description: TECHNICAL FIELD The present invention relates to a shell-and-tube heat exchanger and a method for manufacturing the same, and in particular, it is fitted and joined to a through hole formed in a tube plate of a shell. Regarding measures for simplifying the tube joint structure.
（従来の技術） 従来より、シェルアンドチューブ型熱交換器における冷
媒蒸発用のチューブの１タイプとして、熱交換面積を大
きくして熱交換率の向上を図るべく内周面の全体に亘っ
て螺旋状の溝を刻設して放熱フィンの役割をなすように
形成したものがある。このような内周面加工管を熱交換
器ケーシングとしてのシェルの管板に接合する接合構造
として、特公昭59−16535号公報に示されるように拡管
ピースを用い、この拡管ピースと共にチューブを拡管す
ることで該チューブを管板に穿設された貫通孔に嵌着し
て接合させたものがある。詳しくは、第６図に示すよう
に、内周面の全体に亘って螺旋溝（ａ）が刻設され、且
つ外径（ｄ）が管板（ｂ）に穿設された貫通孔（ｃ）の
内径（Ｄ）よりも僅かに小さいチューブ（ｅ）を上記貫
通孔（ｃ）に挿入した状態で、上記螺旋溝（ａ）におけ
る溝山の径（l1）より若干小さい外径を有する円筒形の
拡管ピース（ｆ）をチューブ（ｅ）の接合部分に挿入し
た後、この拡管ピース（ｆ）の内部に拡管機（ｇ）を配
置し、この拡管機（ｇ）によって前記チューブ（ｅ）を
拡管ピース（ｆ）と共に拡管し、該拡管ピース（ｆ）と
管板（ｂ）との間にチューブ（ｅ）を介在させ、該チュ
ーブ（ｅ）を貫通孔（ｃ）内周面に押付けることで嵌着
させて接合するようにしている。(Prior Art) Conventionally, as a type of tube for evaporating a refrigerant in a shell-and-tube heat exchanger, a spiral is formed over the entire inner peripheral surface in order to increase the heat exchange area and improve the heat exchange rate. There is a groove formed by engraving a groove in the shape of a groove to serve as a heat radiation fin. As a joining structure for joining such an inner peripheral surface processed pipe to a tube plate of a shell as a heat exchanger casing, a pipe expanding piece is used as shown in Japanese Patent Publication No. 59-16535, and the tube is expanded together with this pipe expanding piece. By doing so, there is a tube in which the tube is fitted in and joined to a through hole formed in the tube sheet. Specifically, as shown in FIG. 6, a through hole (c) in which a spiral groove (a) is engraved over the entire inner peripheral surface and an outer diameter (d) is formed in the tube sheet (b). In the state where the tube (e) slightly smaller than the inner diameter (D) of (1) is inserted into the through hole (c), the outer diameter is slightly smaller than the diameter (l 1 ) of the groove crest in the spiral groove (a). After inserting the cylindrical tube-expanding piece (f) into the joint portion of the tube (e), the tube-expanding machine (g) is arranged inside the tube-expanding piece (f), and the tube (e) is moved by the tube-expanding machine (g). ) Is expanded together with the expansion piece (f), the tube (e) is interposed between the expansion piece (f) and the tube plate (b), and the tube (e) is formed on the inner peripheral surface of the through hole (c). It is made to fit and join by pressing.
このような拡管ピース（ｆ）を用いた接合構造によれ
ば、螺旋溝（ａ）の溝山が圧潰される際に金属粉が発生
し難く、仮に金属粉が発生した場合でも、この金属粉は
拡管ピース（ｆ）とチューブ（ｅ）との間で保持される
ことで拡管部外に放出されることはないため、冷媒回路
中に金属粉がゴミとして存在することが抑制される。ま
た、チューブ（ｅ）の接合部分周辺はシェル内の水が滞
留し易い箇所であるため、チューブ（ｅ）内で蒸発する
冷媒の冷却作用によって、このチューブ（ｅ）の接合部
分周辺で水が凍結する場合があり、この相変化に伴う体
積膨張によってチューブ（ｅ）には外力が作用し、この
外力はチューブ（ｅ）を座屈変形させようとするが、上
記拡管ピース（ｆ）はチューブ（ｅ）の接合部分周辺に
おける補強部材としての役割をなし、上記チューブ
（ｅ）の座屈変形は抑制されることになる。According to the joining structure using the tube-expanding piece (f), it is difficult for metal powder to be generated when the groove ridges of the spiral groove (a) are crushed, and even if metal powder is generated, the metal powder Since it is held between the tube expanding piece (f) and the tube (e) and is not discharged to the outside of the tube expanding portion, the presence of metal powder as dust in the refrigerant circuit is suppressed. In addition, since the water around the joint of the tube (e) is likely to accumulate in the shell, the cooling action of the refrigerant that evaporates inside the tube (e) causes the water around the joint of the tube (e). The tube (e) may be frozen, and an external force acts on the tube (e) due to the volume expansion associated with the phase change. This external force tends to buckle and deform the tube (e). It plays a role as a reinforcing member in the vicinity of the joint portion of (e), and buckling deformation of the tube (e) is suppressed.
（発明が解決しようとする課題） しかし、この拡管ピースを用いた接合構造にあっては、
冷媒の流通断面積が拡管ピースの内径に設定されること
になるために、上記流通断面積がチューブ接合部付近で
減少することがあり、この場合、冷媒圧力の損失が増大
するといった課題を有していた。また、拡管ピースを別
個に成形しておかねばならず、部品点数の増加に伴って
製造コストの増大や作業工数の増加に繋っていた。(Problems to be Solved by the Invention) However, in the joining structure using this tube-expanding piece,
Since the flow cross-sectional area of the refrigerant is set to the inner diameter of the expansion piece, the flow cross-sectional area may decrease in the vicinity of the tube joint, and in this case, there is a problem that the loss of refrigerant pressure increases. Was. In addition, the expansion piece must be molded separately, which has led to an increase in manufacturing cost and an increase in work man-hours as the number of parts increases.
そこで、本発明は拡管ピースを用いることなく、上述し
た金属粉の発生や水の凍結によるチューブの座屈変形を
抑制したシェルアンドチューブ型の熱交換器を得ること
を目的とする。Therefore, an object of the present invention is to obtain a shell-and-tube heat exchanger that suppresses the buckling deformation of the tube due to the generation of metal powder and the freezing of water described above, without using a pipe expanding piece.
（課題を解決するための手段） 上記の目的を達成するために、本発明はチューブの内周
面形状を改良したものである。そして、その具体的な手
段は以下に述べるとおりである。(Means for Solving the Problems) In order to achieve the above object, the present invention is to improve the shape of the inner peripheral surface of the tube. The specific means is as described below.
先ず、請求項（１）記載の発明においては、内周面に溝
（11a）を有するチューブ（５）を、拡管することでシ
ェル（２）の管板（３）に形成された貫通孔（3a）に該
チューブ（５）が嵌着接合されて成るシェルアンドチュ
ーブ型熱交換器を対象としている。そして、上記貫通孔
（3a）に対するチューブ（５）の接合部分は、その内周
面が平滑面（12a）で形成された構成としている。First, in the invention according to claim (1), a tube (5) having a groove (11a) on its inner peripheral surface is expanded to form a through hole () formed in the tube sheet (3) of the shell (2). The target is a shell-and-tube heat exchanger in which the tube (5) is fitted and joined to 3a). The inner peripheral surface of the joint portion of the tube (5) with respect to the through hole (3a) has a smooth surface (12a).
また、請求項（２）記載の発明においては、請求項
（１）記載のシェルアンドチューブ型熱交換器におい
て、平滑面（12a）の内端はシェル（２）の管板（３）
の内側面（3b）よりシェル内方側に位置した構成として
いる。Further, in the invention described in claim (2), in the shell and tube heat exchanger according to claim (1), the inner end of the smooth surface (12a) is a tube plate (3) of the shell (2).
It is located on the inner side of the shell from the inner surface (3b) of the.
更に、請求項（３）記載の発明は、内周面に溝（11a）
を有するチューブ（５）を、シェル（２）の管板（３）
に形成された貫通孔（3a）に嵌着接合させるシェルアン
ドチューブ型熱交換器の製造方法であって、上記貫通孔
（3a）に対するチューブ（５）の接合部分は、その内周
面を平滑面（12a）で形成した後、上記接合部分を貫通
孔（3a）に挿通し、その後、この挿通させた状態でチュ
ーブ（５）を拡管し、該チューブ（５）の外周面（5b）
を貫通孔（3a）の内周面（3b）に押圧してチューブ
（５）を上記管板（３）に接合するようにしている。Further, in the invention according to claim (3), the groove (11a) is formed on the inner peripheral surface.
The tube (5) with the tube plate (3) of the shell (2)
A method of manufacturing a shell-and-tube heat exchanger in which the through hole (3a) formed in the above is fitted and joined, wherein the joint portion of the tube (5) to the through hole (3a) has a smooth inner peripheral surface. After forming the surface (12a), the joint portion is inserted into the through hole (3a), and then the tube (5) is expanded in the inserted state, and the outer peripheral surface (5b) of the tube (5) is formed.
Is pressed against the inner peripheral surface (3b) of the through hole (3a) to join the tube (5) to the tube sheet (3).
（作用） 上記の構成による作用を以下に述べる。(Operation) The operation of the above configuration will be described below.
請求項（１）および（３）記載の発明では、チューブ
（５）の平滑面（12a）部分を管板（３）の貫通孔（3
a）に対応した位置まで挿入した後、この平滑面（12a）
部分を拡管することで貫通孔（3a）の内周面（3b）に押
付けて、該チューブ（５）を管板（３）に嵌着接合させ
る。これにより、チューブ（５）の溝（11a）の溝山を
圧潰することがないために、金属粉の発生が無い。そし
て、従来のような拡管ピースを用いることがないため
に、製造コストの増大や作業工数の増加が低減され、更
には、拡管ピースによって生じていた冷媒流通断面積の
減少による冷媒圧力の損失が低減される。In the inventions according to claims (1) and (3), the smooth surface (12a) portion of the tube (5) is connected to the through hole (3) of the tube sheet (3).
After inserting to the position corresponding to a), this smooth surface (12a)
By expanding the portion, it is pressed against the inner peripheral surface (3b) of the through hole (3a), and the tube (5) is fitted and joined to the tube sheet (3). As a result, since the groove crests of the groove (11a) of the tube (5) are not crushed, no metal powder is generated. And, since the conventional tube-expanding piece is not used, the increase in the manufacturing cost and the increase in the number of work steps are reduced, and further, the loss of the refrigerant pressure due to the decrease in the refrigerant flow cross-sectional area caused by the tube-expanding piece is reduced. Will be reduced.
また、請求項（２）記載の発明では、平滑面（12a）の
内端はシェル（２）の管板（３）の内側面よりシェル
（２）内方側に位置していることで、特にシェル（２）
内の水が滞留して凍結し易い部分を厚肉状態で残してお
くことで、チューブ（５）の座屈変形が確実に防止され
る。Further, in the invention described in claim (2), the inner end of the smooth surface (12a) is located on the inner side of the shell (2) with respect to the inner surface of the tube sheet (3) of the shell (2), Especially shell (2)
By leaving a thick portion in which the water in the tube easily accumulates and freezes, the buckling deformation of the tube (5) is reliably prevented.
（実施例） 次に、本発明における一実施例を図面に沿って説明す
る。(Example) Next, an example of the present invention will be described with reference to the drawings.
第４図に示した熱交換器はシェルアンドチューブ型の蒸
発器（１）であって、水入口管（2a）と水出口管（2b）
とを有する円筒状シェル（２）の前部に管板（３）を、
後部に後蓋（４）を夫々取付けて成り、内部にＵ字形の
チューブ（５）を多数本内装して、該チューブ（５）の
開口端（5a）を前記管板（３）に形成した多数の貫通孔
（3a）に、拡管機（６）（第２図）により拡管すること
で接合されている。また、前記チューブ（５）の中間部
に複数のバッフル（７）を取付ける一方、前記管板
（３）に、十字状の仕切板（8a）を配設した前蓋（８）
をボルト等の固定手段で固定し、前記仕切板（8a）で区
画した各室に、径の小さい液冷媒管（９）と径の大きい
ガス冷媒管（10）とが接合されているものである。そし
て、チューブ（５）が接合される管板（３）は第５図に
示すような位置に上記貫通孔（3a），（3a），…が穿設
されており、第１図の如く、この貫通孔（3a）は、チュ
ーブ（５）の外径（ｄ）よりも僅かに大きい内径（Ｄ）
に設定されていると共に、該貫通孔（3a）の内周面（3
b）には複数本（本例のものは３本）の環状溝（3c）が
形成されている。The heat exchanger shown in FIG. 4 is a shell-and-tube type evaporator (1), which has a water inlet pipe (2a) and a water outlet pipe (2b).
A tube sheet (3) at the front of a cylindrical shell (2) having
A rear lid (4) is attached to each of the rear parts, a large number of U-shaped tubes (5) are internally provided, and an open end (5a) of the tubes (5) is formed in the tube sheet (3). It is joined to a large number of through holes (3a) by expanding the pipe with a pipe expander (6) (Fig. 2). A front lid (8) having a plurality of baffles (7) attached to an intermediate portion of the tube (5) and a cross-shaped partition plate (8a) arranged on the tube plate (3).
Is fixed by a fixing means such as a bolt, and a liquid refrigerant pipe (9) having a small diameter and a gas refrigerant pipe (10) having a large diameter are joined to each chamber partitioned by the partition plate (8a). is there. The tube plate (3) to which the tube (5) is joined has the through holes (3a), (3a), ... At the positions shown in FIG. 5, and as shown in FIG. The through hole (3a) has an inner diameter (D) slightly larger than the outer diameter (d) of the tube (5).
And the inner peripheral surface (3) of the through hole (3a).
A plurality of (3 in this example) annular grooves (3c) are formed in b).
次に、上記チューブ（５）をシェル（２）の管板（３）
に固定する際に用いられる拡管機（６）を第２図および
第３図を用いて説明する。この拡管機（６）は従来のも
のと略同構成で成り、先細りのマンドレル（6a）と、該
マンドレル（6a）の周面に当接され、120°の角度間隔
を存して配設されるようにフレーム（6b）に支持された
複数のローラ（6c），（6c），…とから成るものであっ
て、マンドレル（6a）を回転させながら、その先端方向
（第２図右方向）へ前進させると、ローラ（6c），（6
c），…が自転しながらマンドレル（6a）の回りを公転
すると共に、該ローラ（6c），（6c），…はマンドレル
（6a）の太径部分に当接されることになるために、半径
方向外方に移動されるように構成されている。即ち、マ
ンドレル（6a）の前進によってローラ（6c），（6c），
…が外周側へ押し拡げられるようになっている。Next, the tube (5) is attached to the tube plate (3) of the shell (2).
The tube expander (6) used for fixing to the above will be described with reference to FIGS. 2 and 3. The tube expander (6) has substantially the same structure as that of the conventional one, and is in contact with the tapered mandrel (6a) and the peripheral surface of the mandrel (6a), and is arranged with an angular interval of 120 °. Is composed of a plurality of rollers (6c), (6c), ..., Which are supported by the frame (6b), and the tip direction (right direction in FIG. 2) of the mandrel (6a) while rotating. When you move forward to (6c), (6
c), ... Revolves around the mandrel (6a) while rotating, and the rollers (6c), (6c), ... Are contacted with the large diameter portion of the mandrel (6a). It is configured to be moved radially outward. That is, as the mandrel (6a) advances, the rollers (6c), (6c),
... can be expanded to the outer peripheral side.
そして、本発明の特徴とする所はチューブ（５）の内周
面形状にある。このチューブ（５）の内周面は、第１図
に示すように、螺旋溝成形部分（11）と平滑面部分（1
2）とで形成されている。The feature of the present invention is the shape of the inner peripheral surface of the tube (5). As shown in FIG. 1, the inner peripheral surface of the tube (5) has a spiral groove forming portion (11) and a smooth surface portion (1).
2) is formed by and.
螺旋溝成形部分（11）は、従来のチューブと同様にチュ
ーブ内周面に複数条の螺旋溝（11a）が形成された部分
であって、チューブ（５）の内周表面積を大きくするこ
とによる放熱性の向上を図った構成となっている。尚、
この螺旋溝（11a）の形状として、例えば、前記チュー
ブ（５）の外径を12.7mm、厚さ0.8mmとした場合、溝傾
斜角30°で溝山高さ0.3mmとし、6mm間隔で60条などに設
定される。The spiral groove forming portion (11) is a portion in which a plurality of spiral grooves (11a) are formed on the inner peripheral surface of the tube as in the conventional tube, and is formed by increasing the inner peripheral surface area of the tube (5). It is designed to improve heat dissipation. still,
As for the shape of the spiral groove (11a), for example, when the outer diameter of the tube (5) is 12.7 mm and the thickness is 0.8 mm, the groove inclination angle is 30 °, the groove mountain height is 0.3 mm, and the groove width is 60 mm at 6 mm intervals. Is set to.
一方、上記平滑面部分（12）は、その長さが上記管板
（３）の厚さ寸法（ｔ）よりやや大きく（本例では管板
の厚さ寸法の1.3倍程度）設定されており、チューブ
（５）の取付時においては、この平滑面部分（12）の平
滑面（12a）に上記拡管機（６）のローラ（6c），（6
c），…が当接されて、その一部分が拡管されることに
なる。On the other hand, the length of the smooth surface portion (12) is set to be slightly larger than the thickness dimension (t) of the tube sheet (3) (about 1.3 times the thickness dimension of the tube sheet in this example). When installing the tube (5), the rollers (6c), (6) of the tube expander (6) are attached to the smooth surface (12a) of the smooth surface portion (12).
c), ... are brought into contact with each other, and a part of them is expanded.
次に、チューブ（５）の取付作業について、請求項
（３）記載の方法に沿って説明する。Next, the attachment work of the tube (5) will be described according to the method of claim (3).
先ず、第１図に示すように、チューブ（５）の平滑面部
分（12）を管板（３）の貫通孔（3a）に嵌入する。この
時、チューブ（５）は拡管されておらず、その外径
（ｄ）は貫通孔（3a）の内径（Ｄ）より小径となってい
るために、該チューブ（５）は貫通孔（3a）に遊嵌状態
となっている。First, as shown in FIG. 1, the smooth surface portion (12) of the tube (5) is fitted into the through hole (3a) of the tube sheet (3). At this time, the tube (5) is not expanded, and its outer diameter (d) is smaller than the inner diameter (D) of the through hole (3a). ) Is loosely fitted.
次に、第２図の如く、チューブ（５）の開口端（5a）か
ら拡管機（６）を挿入してローラ（6c），（6c），…を
チューブ（５）の平滑面部分（12）の平滑面（12a）に
当接させる。この状態でマンドレル（6a）を回転させな
がら前進させると、ローラ（6c）が自転しながらマンド
レル（6a）の回りを公転して半径方向外側に移動され、
チューブ（５）の平滑面部分（12）を外側へ押し拡げ
る。これによって、チューブ（５）の開口端（5a）付近
の外周面（5b）は、貫通孔（3a）の内周面（3b）に押し
付けられると共に、一部が環状溝（3c）内に塑性流動
し、該チューブ（５）は貫通孔（3a）に強固に取付けら
れる。また、貫通孔（3a）の内周面（3b）に接着剤を塗
布しておくと、更に取付強度の向上を図ることができ
る。Next, as shown in FIG. 2, the tube expander (6) is inserted from the open end (5a) of the tube (5) and the rollers (6c), (6c), ... Are connected to the smooth surface portion (12) of the tube (5). A) to the smooth surface (12a). When the mandrel (6a) is rotated and moved forward in this state, the roller (6c) revolves around the mandrel (6a) while rotating, and is moved radially outward.
Push the smooth surface (12) of the tube (5) outward. As a result, the outer peripheral surface (5b) near the open end (5a) of the tube (5) is pressed against the inner peripheral surface (3b) of the through hole (3a), and a part of the outer peripheral surface (5b) is plasticized in the annular groove (3c). It flows and the tube (5) is firmly attached to the through hole (3a). Further, if an adhesive is applied to the inner peripheral surface (3b) of the through hole (3a), the mounting strength can be further improved.
このような接合構造によれば、チューブ（５）の拡管部
分には螺旋溝（11a）が形成されておらず、拡管機
（６）が螺旋溝（11a）の溝山を圧潰することがないた
めに、金属粉の発生が無く、また、接合部分周辺は管厚
の大きい平滑面部分（12）で形成したことで、該部分は
補強されており、シェル（２）内の水の相変化に伴う体
積膨張による外力によってチューブ（５）が座屈変形す
ることが抑制されている。そして、従来のような拡管ピ
ースを用いることがないために、部品点数の増加に伴う
製造コストの増大や作業工数の増加が低減され、更に
は、拡管ピースによって生じていた冷媒流通断面積の減
少による冷媒圧力の損失が低減され、それでいて上述し
たような拡管ピースを用いた場合と同様の効果が発揮さ
れる。According to such a joining structure, the spiral groove (11a) is not formed in the pipe expanding portion of the tube (5), and the pipe expanding machine (6) does not crush the groove crests of the spiral groove (11a). Therefore, no metal powder is generated, and the periphery of the joint is formed by the smooth surface part (12) with a large pipe thickness, which is reinforced, and the phase change of water in the shell (2) The tube (5) is restrained from being buckled and deformed by the external force due to the volume expansion associated with. Further, since the conventional expansion piece is not used, the increase in the manufacturing cost and the increase in the work man-hours due to the increase in the number of parts are reduced, and further, the refrigerant flow cross-sectional area generated by the expansion piece is reduced. Due to this, the loss of the refrigerant pressure due to is reduced, and yet the same effect as in the case of using the tube expanding piece as described above is exhibited.
尚、本例にあっては、平滑面部分（12）の長さを上記管
板（３）の厚さ寸法（ｔ）よりやや大きく設定したが、
本発明はこれに限るものではなく、チューブ（５）の拡
管部分長さを短く設定した場合には、平滑面部分（12）
の長さを管板（３）の厚さ寸法（ｔ）より短く設定して
も良い。具体的には平滑面部分の長さを（t1）とする
と、0.5t≦t1≦2.0tの範囲が実用的である。また、チュ
ーブ（５）内周面に形成した溝（11a）は螺旋状とした
が、チューブ（５）の軸方向に延びる直線状溝で形成し
てもよい。In this example, the length of the smooth surface portion (12) is set to be slightly larger than the thickness dimension (t) of the tube sheet (3).
The present invention is not limited to this, and when the length of the expanded portion of the tube (5) is set to be short, the smooth surface portion (12)
May be set shorter than the thickness dimension (t) of the tube sheet (3). Specifically, assuming that the length of the smooth surface portion is (t 1 ), the range of 0.5t ≦ t 1 ≦ 2.0t is practical. Further, although the groove (11a) formed on the inner peripheral surface of the tube (5) has a spiral shape, it may be formed by a linear groove extending in the axial direction of the tube (5).
（発明の効果） 上述したように、本発明によれば以下に述べるような効
果が発揮される。(Effect of the Invention) As described above, according to the present invention, the following effects are exhibited.
請求項（１）および（３）記載の発明では、従来のよう
な拡管ピースを用いることがないために、製造コストの
増大や作業工数の増加が低減されると共に、拡管ピース
によって生じていた冷媒流通断面積の減少による冷媒圧
力の損失が低減される。また、チューブの螺旋溝の溝山
を圧潰することがないために、金属粉の発生が無く、ま
た、接合部分周辺が補強されており、チューブの座屈変
形が抑制されるといった効果を拡管ピースを用いること
なしに発揮させることができる。In the inventions described in claims (1) and (3), since the conventional tube-expanding piece is not used, an increase in manufacturing cost and an increase in work man-hours are reduced, and the refrigerant generated by the tube-expanding piece is reduced. The loss of the refrigerant pressure due to the reduction of the flow cross-sectional area is reduced. In addition, since the groove of the spiral groove of the tube is not crushed, no metal powder is generated, and the periphery of the joint is reinforced, so that the buckling deformation of the tube is suppressed. Can be demonstrated without using.
また、請求項（２）記載の発明では、平滑面の内端はシ
ェルの管板の内側面よりシェル内方側に位置した構成と
したことで、特にシェル内の水が滞留して凍結し易い部
分を厚肉状態で残しておくことで、チューブの座屈変形
が確実に防止される。Further, in the invention described in claim (2), since the inner end of the smooth surface is located on the inner side of the shell from the inner surface of the tube sheet of the shell, water in the shell is accumulated and frozen. By leaving the easy-to-use portion in a thick state, buckling deformation of the tube is reliably prevented.
【図面の簡単な説明】 第１図〜第５図は本発明の一実施例を示し、第１図はチ
ューブが管板の貫通孔に挿入された拡管前の状態を示す
縦断面図、第２図はチューブの拡管作業を示す縦断面
図、第３図は第２図のIII−III線に沿った断面図、第４
図はシェルアンドチューブ型熱交換器の一部破断側面
図、第５図は管板の正面図である。第６図は従来のチュ
ーブ拡管作業を示す第２図相当図である。 （１）…蒸発器（熱交換器） （２）…シェル （３）…管板 （3a）…貫通孔 （3b）…内周面 （５）…チューブ （5b）…外周面 （11a）…螺旋溝（溝） （12a）…平滑面BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 to FIG. 5 show an embodiment of the present invention, and FIG. 1 is a longitudinal sectional view showing a state before expansion of a tube inserted into a through hole of a tube sheet. 2 is a longitudinal sectional view showing the tube expanding operation, FIG. 3 is a sectional view taken along the line III-III in FIG. 2, and FIG.
The figure is a partially broken side view of the shell-and-tube heat exchanger, and FIG. 5 is a front view of the tube sheet. FIG. 6 is a view corresponding to FIG. 2 showing a conventional tube expanding operation. (1) ... Evaporator (heat exchanger) (2) ... Shell (3) ... Tube plate (3a) ... Through hole (3b) ... Inner peripheral surface (5) ... Tube (5b) ... Outer peripheral surface (11a) ... Spiral groove (groove) (12a) ... Smooth surface
Claims (3)
（５）を、拡管することでシェル（２）の管板（３）に
形成された貫通孔（3a）に該チューブ（５）が嵌着接合
されて成るシェルアンドチューブ型熱交換器において、
上記貫通孔（3a）に対するチューブ（５）の接合部分
は、その内周面が平滑面（12a）で形成されていること
を特徴とするシェルアンドチューブ型熱交換器。1. A tube (5) having a groove (11a) on an inner peripheral surface thereof is expanded to form a through hole (3a) formed in a tube plate (3) of a shell (2). In a shell-and-tube heat exchanger formed by fitting and joining,
A shell-and-tube heat exchanger, wherein an inner peripheral surface of a joint portion of the tube (5) to the through hole (3a) is formed as a smooth surface (12a).
型熱交換器において、平滑面（12a）の内端はシェル
（２）の管板（３）の内側面（3b）よりシェル内方側に
位置していることを特徴とするシェルアンドチューブ型
熱交換器。2. The shell-and-tube heat exchanger according to claim 1, wherein the inner end of the smooth surface (12a) is located inward of the shell (2) from the inner surface (3b) of the tube plate (3). A shell-and-tube heat exchanger characterized by being located on the side.
（５）を、シェル（２）の管板（３）に形成された貫通
孔（3a）に嵌着接合させるシェルアンドチューブ型熱交
換器の製造方法であって、上記貫通孔（3a）に対するチ
ューブ（５）の接合部分は、その内周面を平滑面（12
a）で形成した後、上記接合部分を貫通孔（3a）に挿通
し、その後、この挿通させた状態でチューブ（５）を拡
管し、該チューブ（５）の外周面（5b）を貫通孔（3a）
の内周面（3b）に押圧してチューブ（５）を上記管板
（３）に接合することを特徴とするシェルアンドチュー
ブ型熱交換器の製造方法。3. A shell-and-tube type heat for fitting and joining a tube (5) having a groove (11a) on its inner peripheral surface to a through hole (3a) formed in a tube plate (3) of a shell (2). A method of manufacturing an exchanger, wherein the joint portion of the tube (5) to the through hole (3a) has a smooth surface (12) on its inner peripheral surface.
After being formed in a), the joint portion is inserted into the through hole (3a), and then the tube (5) is expanded in the inserted state, and the outer peripheral surface (5b) of the tube (5) is inserted into the through hole. (3a)
A method for manufacturing a shell-and-tube heat exchanger, characterized in that the tube (5) is joined to the tube sheet (3) by pressing the inner peripheral surface (3b) of the tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1227998A JPH0716740B2 (en) | 1989-08-31 | 1989-08-31 | Shell and tube heat exchanger and method of manufacturing the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1227998A JPH0716740B2 (en) | 1989-08-31 | 1989-08-31 | Shell and tube heat exchanger and method of manufacturing the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0390235A JPH0390235A (en) | 1991-04-16 |
| JPH0716740B2 true JPH0716740B2 (en) | 1995-03-01 |
Family
ID=16869578
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1227998A Expired - Lifetime JPH0716740B2 (en) | 1989-08-31 | 1989-08-31 | Shell and tube heat exchanger and method of manufacturing the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0716740B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11201041A (en) * | 1998-01-20 | 1999-07-27 | Funai Electric Co Ltd | Manufacture of compressor and pipe expanding jig used in the manufacture |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0614784U (en) * | 1992-06-25 | 1994-02-25 | 石川島播磨重工業株式会社 | Mounting structure for heat transfer tubes for air-cooled heat exchangers |
| JP5194868B2 (en) * | 2008-02-15 | 2013-05-08 | 株式会社豊田自動織機 | Boiling cooler |
| JP4763018B2 (en) * | 2008-04-07 | 2011-08-31 | 明和金属工業株式会社 | Metal cylinder tube expansion apparatus and method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6380915A (en) * | 1986-09-25 | 1988-04-11 | Hitachi Cable Ltd | Inner face grooved pipe and its manufacture |
-
1989
- 1989-08-31 JP JP1227998A patent/JPH0716740B2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6380915A (en) * | 1986-09-25 | 1988-04-11 | Hitachi Cable Ltd | Inner face grooved pipe and its manufacture |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11201041A (en) * | 1998-01-20 | 1999-07-27 | Funai Electric Co Ltd | Manufacture of compressor and pipe expanding jig used in the manufacture |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0390235A (en) | 1991-04-16 |
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