JP2002107090A - Plate-type heat exchanger and producing method - Google Patents
Plate-type heat exchanger and producing methodInfo
- Publication number
- JP2002107090A JP2002107090A JP2000300979A JP2000300979A JP2002107090A JP 2002107090 A JP2002107090 A JP 2002107090A JP 2000300979 A JP2000300979 A JP 2000300979A JP 2000300979 A JP2000300979 A JP 2000300979A JP 2002107090 A JP2002107090 A JP 2002107090A
- Authority
- JP
- Japan
- Prior art keywords
- heat transfer
- plate
- welding
- heat exchanger
- transfer plate
- 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
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Landscapes
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は、ステンレス鋼板等
の複数枚の伝熱プレートを重ねて溶接接合した完全溶接
式のプレート式熱交換器に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a completely welded plate heat exchanger in which a plurality of heat transfer plates such as stainless steel plates are overlapped and welded.
【0002】[0002]
【従来の技術】複数枚の伝熱プレートを積層して伝熱プ
レート間に熱交換される流体が流通する流体流路を形成
したプレート式熱交換器は、伝熱プレート同士を溶接接
合して流体流路を気液密にシールした完全溶接式のもの
が、流体流路のシール性と機械的強度の安定性に優れる
ことで普及している。この完全溶接式の熱交換器に使用
される伝熱プレートは、プレス成形されたステンレス鋼
板等の略矩形平板状のもので、4隅部に2種の流体の出
入口となる通路口を有する。この伝熱プレートを使用し
た完全溶接式のプレート式熱交換器は、各伝熱プレート
の積層された2枚の通路口周辺部同士を溶接して内部シ
ール溶接ラインを形成し、各伝熱プレートの積層された
周縁部同士を溶接して外部シール溶接ラインを形成した
構造が一般的であり、その具体例を図5乃至図7に示
す。2. Description of the Related Art A plate-type heat exchanger in which a plurality of heat transfer plates are stacked to form a fluid passage through which a heat exchange fluid flows between the heat transfer plates is formed by welding and joining the heat transfer plates. 2. Description of the Related Art A completely welded type in which a fluid flow path is sealed in a gas-liquid tight manner is widely used because of its excellent sealing performance and mechanical strength of the fluid flow path. The heat transfer plate used in this complete welding type heat exchanger has a substantially rectangular flat plate shape, such as a press-formed stainless steel plate, and has passage openings serving as two types of fluid ports at four corners. The complete welding type plate heat exchanger using this heat transfer plate welds the peripheral portions of the two passage openings of each heat transfer plate to form an internal seal welding line, and forms each heat transfer plate. In general, the outer peripheral welding line is formed by welding the laminated peripheral portions of the above, and specific examples thereof are shown in FIGS.
【0003】同図に示される熱交換器は、複数枚の同一
外形寸法の伝熱プレート1を積層して溶接で一体化した
プレート積層体10を有する。伝熱プレート1は板厚1
mm程度の略矩形のステンレス鋼板で、これの4隅部に
流体の出入口となる通路口2が形成される。また、プレ
ート積層体10の表裏両面に耐圧フレーム21,22が
ろう付け等で固定され、表面側の耐圧フレーム21の4
隅に流体導入導出用ノズル31〜34がろう付け等で固
定される。各ノズル31〜34は対応するプレート積層
体10の4隅の通路口2と連通する。The heat exchanger shown in FIG. 1 has a plate laminate 10 in which a plurality of heat transfer plates 1 having the same external dimensions are laminated and integrated by welding. Heat transfer plate 1 has thickness 1
The stainless steel plate is a substantially rectangular stainless steel plate having a diameter of about mm, and a passage port 2 serving as a fluid inlet / outlet is formed at four corners of the stainless steel plate. The pressure-resistant frames 21 and 22 are fixed to the front and back surfaces of the plate laminate 10 by brazing or the like.
Nozzles 31 to 34 for fluid introduction / extraction are fixed to the corners by brazing or the like. Each of the nozzles 31 to 34 communicates with the passage openings 2 at the four corners of the corresponding plate laminate 10.
【0004】プレート積層体10における複数の各伝熱
プレート1の間に1種の流体が流通する流体流路Pと他
の1種の流体が流通する流体流路Qが交互に形成され
る。各伝熱プレート1の中央部分は伝熱面積を大きくし
たV形や逆V形パターンの波板状伝熱部1aであり、隣
接する2枚の伝熱プレート1の波板状伝熱部1aが重な
って形成される両プレート間の流体流路P,QはV形波
の谷空間と逆V形波の谷空間で形成される。プレート積
層体10の4つの通路口2に連通させた4つのノズル3
1〜34の内の例えば対角線方向の2つのノズル31,
33が一方の流体流路Pと連通し、残りの2つのノズル
32,34が他の流体流路Qと連通する。そして、ノズ
ル31から1種の流体が流体流路Pに導入されると、こ
の1種の流体は流体流路Pを流通してノズル33から外
部に導出され、別のノズル32から別の1種の流体が流
体流路Qに導入されると、この流体が流体流路Qを流通
してノズル34から外部に導出される。このようにして
隣接する流体流路P、Qを2種の流体が流通する間に、
両流路間の伝熱プレート1の波板状伝熱部1aを介して
熱交換が行われる。A fluid flow path P through which one kind of fluid flows and a fluid flow path Q through which another kind of fluid flows are formed alternately between the plurality of heat transfer plates 1 in the plate laminate 10. The central portion of each heat transfer plate 1 is a corrugated heat transfer portion 1a of a V-shaped or inverted V-shaped pattern having a large heat transfer area, and a corrugated heat transfer portion 1a of two adjacent heat transfer plates 1. The fluid flow paths P and Q between the two plates are formed by a V-shaped wave trough space and an inverted V-shaped wave trough space. Four nozzles 3 communicating with the four passage openings 2 of the plate laminate 10
For example, two nozzles 31 in the diagonal direction among 1 to 34,
33 communicates with one fluid flow path P, and the remaining two nozzles 32 and 34 communicate with the other fluid flow path Q. When one type of fluid is introduced into the fluid flow path P from the nozzle 31, the one type of fluid flows through the fluid flow path P, is led out of the nozzle 33, and is discharged from another nozzle 32 to another one type. When the seed fluid is introduced into the fluid flow path Q, the fluid flows through the fluid flow path Q and is led out of the nozzle 34 to the outside. In this way, while two kinds of fluids flow through the adjacent fluid flow paths P and Q,
Heat exchange is performed via the corrugated heat transfer portion 1a of the heat transfer plate 1 between the two flow paths.
【0005】プレート積層体10は、内部での流体の漏
洩や2種の流体の混合が生じ無いように、図6と図7の
黒丸印で示す各溶接ラインLa,Lb、Lcをレーザー
溶接してシールしている。つまり、図6に示す内部シー
ル溶接ラインLaのように、積層される伝熱プレート1
の通路口周辺部同士を通路口2を囲む円形パターンでレ
ーザー溶接して、内部シール溶接ラインLaで囲まれる
通路口2における流体漏洩や異種流体の混合を防止する
ようにしている。また、図7に示す外部シール溶接ライ
ンLb、Lcのように、積層される伝熱プレート1の周
縁部同士をレーザー溶接して、2種の流体流路P,Qの
周縁端を気液密にシールすることで、流体流路P,Qに
おける流体漏洩や異種流体の混合を防止している。この
伝熱プレート1の周縁部をシールする溶接箇所は内側と
外側の2列ラインが必要で、図7には1種の流体流路P
をシールする内側の外部シール溶接ラインLbと他の1
種の流体流路Qをシールする外側の外部シール溶接ライ
ンLcである。なお、伝熱プレート1の通路口2の在る
4隅部における外部シール溶接ラインは1ラインの場合
と2列ラインの場合があり、図6では外側だけの外部シ
ール溶接ラインLcが示される。The plate laminate 10 is formed by laser welding each of the welding lines La, Lb, Lc indicated by black circles in FIGS. 6 and 7 so that leakage of fluid and mixing of two fluids do not occur inside. And sealed. That is, as shown in the internal seal welding line La shown in FIG.
Are welded in a circular pattern surrounding the passage opening 2 in a circular pattern to prevent fluid leakage and mixing of different kinds of fluids in the passage opening 2 surrounded by the internal seal welding line La. Also, as in the case of the outer seal welding lines Lb and Lc shown in FIG. 7, the peripheral portions of the heat transfer plates 1 to be laminated are laser-welded to each other so that the peripheral edges of the two types of fluid flow paths P and Q are gas-liquid-tight. To prevent fluid leakage in the fluid flow paths P and Q and mixing of different kinds of fluids. The welded portion for sealing the peripheral portion of the heat transfer plate 1 needs two rows of lines inside and outside, and FIG.
Inner outer seal welding line Lb and other 1
The outer seal welding line Lc on the outer side for sealing the kind of fluid flow path Q. The external seal welding lines at the four corners where the passage opening 2 of the heat transfer plate 1 is present may be a single line or a two-line line, and FIG. 6 shows the external seal welding line Lc only on the outside.
【0006】上記完全溶接式のプレート積層体10は、
複数枚の伝熱プレート1を1枚ずつレーザー溶接して製
造される。つまり、1枚の伝熱プレート1上に2枚目の
伝熱プレート1を重ねて、内部シール溶接ラインLaを
レーザー溶接し、2列の内外の外部シール溶接ラインL
b、Lcをレーザー溶接してから、3枚目の伝熱プレー
ト1を重ねてレーザー溶接するようにして、1枚ずつが
順に積層されてレーザー溶接され、所定枚数の溶接が終
了してプレート積層体10が完成する。[0006] The plate laminate 10 of the complete welding type is
It is manufactured by laser welding a plurality of heat transfer plates 1 one by one. That is, the second heat transfer plate 1 is superimposed on one heat transfer plate 1, the inner seal welding line La is laser-welded, and two rows of inner and outer outer seal welding lines L are formed.
b, Lc are laser-welded, then the third heat transfer plate 1 is overlapped and laser-welded, and one by one is sequentially laminated and laser-welded, and a predetermined number of welds are completed and the plates are laminated. The body 10 is completed.
【0007】[0007]
【発明が解決しようとする課題】プレート式熱交換器
は、複数枚の伝熱プレート1の伝熱部1aをV形や逆V
形等の波板状にして表面積を大きくすることで伝熱効率
を高くするようにしている。また、伝熱部1aの周縁部
を2列のラインに沿ってレーザー溶接するために、伝熱
プレート1の周縁部に平行な2列の溶接用平坦周縁部1
b、1cを必要としている。この平坦周縁部1b、1c
は内側平坦周縁部1bと外側平坦周縁部1cであり、積
層される2枚の伝熱プレート1の内側平坦周縁部1b同
士を重ねてレーザー溶接することで内側の内部シール溶
接ラインLbが形成され、外側平坦周縁部1cをレーザ
ー溶接することで外側の内部シール溶接ラインLcを形
成している。In the plate heat exchanger, the heat transfer portions 1a of the plurality of heat transfer plates 1 are formed in a V-shape or an inverted V-shape.
The heat transfer efficiency is increased by increasing the surface area by forming a corrugated shape such as a shape. Further, in order to laser-weld the peripheral portion of the heat transfer portion 1a along two lines, two flat welding peripheral portions 1 parallel to the peripheral portion of the heat transfer plate 1.
b and 1c are required. This flat peripheral portion 1b, 1c
Are the inner flat peripheral edge portion 1b and the outer flat peripheral edge portion 1c. The inner flat peripheral edge portions 1b of the two heat transfer plates 1 to be laminated are overlapped and laser-welded to form an inner inner seal welding line Lb. The outer inner seal welding line Lc is formed by laser welding the outer flat peripheral edge portion 1c.
【0008】ここで、図7に示すように1箇所の外側の
外部シール溶接ライン1cで溶接される2枚の伝熱プレ
ート1の間に形成される1種の流体流路Qの最も端の流
路をQxとすると、この流路Qxは3箇所の溶接ライン
Lb、Lb、Lcと1箇所のプレート接触部1dで囲ま
れた空間で、流体流路Qと同じ出口用ノズルに連通す
る。また、流路Qxの図7右側のプレート接触部1d
は、2枚の伝熱プレート1の波板の山面同士が接触する
シールされていない部所であるため、流体流路Qを流通
する1種の流体がプレート接触部1dから流路Qxに侵
入して、侵入した流体が流路Qxを流れて出口用ノズル
から熱交換器外に排出される。このような流路Qxは流
体流Qに隣接する別の流体流路Pとの間で熱交換がほと
んど行われないショートパス通路と呼ばれ、流路Qxに
流体流路Qから侵入した1種の流体は元の流体流路Qに
戻らずに排出されて他の1種の流体との熱交換に関与し
なくなる。而も、伝熱プレート1の伝熱部1aの流体流
路Qの全容積に占める流路Qxの容積の割合が高くて、
ここに流れて排出される流体の量が多い。そのため、伝
熱プレート1の伝熱性能がショートパス通路となる流路
Qxのために低下して、熱交換器の熱交換効率を上げる
ことが難しい。Here, as shown in FIG. 7, one end of one type of fluid flow path Q formed between two heat transfer plates 1 which are welded by one outer seal welding line 1c outside. Assuming that the flow path is Qx, the flow path Qx communicates with the same outlet nozzle as the fluid flow path Q in a space surrounded by three welding lines Lb, Lb, Lc and one plate contact portion 1d. Also, the plate contact portion 1d on the right side of FIG.
Is an unsealed portion where the crests of the corrugated plates of the two heat transfer plates 1 are in contact with each other, so that one type of fluid flowing through the fluid flow path Q flows from the plate contact portion 1d to the flow path Qx. The invading fluid flows through the flow path Qx and is discharged from the outlet nozzle to the outside of the heat exchanger. Such a flow path Qx is called a short path path in which heat exchange is hardly performed with another fluid flow path P adjacent to the fluid flow Q. Is discharged without returning to the original fluid flow path Q, and does not participate in heat exchange with another type of fluid. Also, the ratio of the volume of the flow path Qx to the total volume of the fluid flow path Q of the heat transfer section 1a of the heat transfer plate 1 is high,
The amount of fluid flowing and discharged here is large. Therefore, the heat transfer performance of the heat transfer plate 1 decreases due to the flow path Qx serving as the short path passage, and it is difficult to increase the heat exchange efficiency of the heat exchanger.
【0009】上記伝熱プレート1の流路Qxによる伝熱
性能低下を軽減させる改善策として、流路Qxに図示し
ない障害物を充填して流体流路Qから1種の流体が流路
Qxに侵入しないように、或いは、侵入しても微量に抑
制して、伝熱プレート1の伝熱性能を上げることが行わ
れている。このようにすると伝熱性能が向上するが、複
数枚の伝熱プレート1を1枚ずつ順にレーザー溶接する
作業の合間に流路Qxに障害物を充填する作業行程が必
要であり、かつ、この障害物充填作業が工数多くて手間
と時間を要して、熱交換器の製造コストを高くしてい
る。As an improvement measure for reducing the heat transfer performance deterioration due to the flow path Qx of the heat transfer plate 1, an obstacle (not shown) is filled in the flow path Qx so that one type of fluid flows from the fluid flow path Q to the flow path Qx. The heat transfer performance of the heat transfer plate 1 is improved so as not to enter, or to suppress even a small amount of entry. This improves the heat transfer performance, but requires a work step of filling the flow path Qx with an obstacle during the operation of sequentially laser welding a plurality of heat transfer plates 1 one by one. Obstruction filling work requires a lot of labor and time, which increases the production cost of the heat exchanger.
【0010】また、伝熱プレート1を1枚ずつ積層しレ
ーザー溶接してプレート積層体10を製造しているが、
2枚の伝熱プレート1を平面同士で重ね合わせてからの
溶接であるために、伝熱プレート1の横ズレ等を精度良
く防止する高精度の位置決め治具類が必要とし、而も,
伝熱プレート1枚毎の溶接箇所が多いことから、熱交換
器の製造コストが尚更に高くなる。また、プレート積層
体10の各伝熱プレートの周縁部を平行な内外2列の溶
接ラインでシールしているため、特に内側の溶接ライン
Lbが溶接不良で流体漏れが発生したときに、溶接不良
箇所を外部から溶接補修ができない不便さがあった。[0010] Further, the plate laminate 10 is manufactured by laminating the heat transfer plates 1 one by one and performing laser welding.
Since welding is performed after the two heat transfer plates 1 are superposed on each other on a plane surface, high-precision positioning jigs for accurately preventing lateral displacement of the heat transfer plate 1 are required.
Since there are many welding locations for each heat transfer plate, the manufacturing cost of the heat exchanger is even higher. Further, since the peripheral edge of each heat transfer plate of the plate laminate 10 is sealed by two parallel inner and outer welding lines, particularly when the inner welding line Lb is poorly welded and fluid leakage occurs, poor welding is performed. There was an inconvenience that welding repair could not be performed on the part from outside.
【0011】本発明の目的は、熱交換効率の向上と製造
コストの低下を可能にする完全溶接式のプレート式熱交
換器を提供することにある。An object of the present invention is to provide a completely welded plate type heat exchanger capable of improving heat exchange efficiency and reducing manufacturing costs.
【0012】[0012]
【課題を解決するための手段】本発明は、流体の通路口
と外周に板厚方向に屈曲させた縁立て部を有する伝熱プ
レートの複数枚を、各伝熱プレートの縁立て部を順に重
ねた状態で積層したプレート積層体の、上下に積層され
た下層側の伝熱プレートの縁立て部の外面一部に、この
外面に積層される上層の伝熱プレートの縁立て部の先端
を溶接接合したプレート式熱交換器にて、上記目的を達
成するものである。SUMMARY OF THE INVENTION According to the present invention, a plurality of heat transfer plates having a passage opening for a fluid and a rim portion bent in the thickness direction on the outer periphery are formed by sequentially setting the rim portions of each heat transfer plate. On the part of the outer surface of the rim of the lower heat transfer plate, which is vertically stacked, the tip of the rim of the upper heat transfer plate laminated on this outer surface The above object is achieved by a plate-type heat exchanger joined by welding.
【0013】ここでの伝熱プレートは、波板状の伝熱部
の外周にろう付け接合するための縁立て部を一体に有す
るブレージング式のプレート式熱交換器の伝熱プレート
と同様なものが使用される。このブレージング式熱交換
器の伝熱プレートと同様な伝熱プレートの複数枚を積層
すると、各伝熱プレートの縁立て部が直接に面接触した
状態で重合して、最終的に下層の縁立て部の外面に上層
の縁立て部の先端が隅肉溶接等で溶接され、このときの
溶接ラインがプレート積層体の外部シール溶接ラインと
なる。プレート積層体が内部シール溶接ラインを有する
場合は、伝熱プレートを積層する際に内部シール溶接ラ
インを形成してプレート積層体を構成してから、外部シ
ール溶接ラインを形成する。このような製造方法を具体
化したのが本発明の請求項2の製造方法である。The heat transfer plate here is the same as the heat transfer plate of the brazing type plate heat exchanger integrally having a fringe portion for brazing to the outer periphery of the corrugated heat transfer portion. Is used. When a plurality of heat transfer plates similar to the heat transfer plate of this brazing type heat exchanger are stacked, the rims of the heat transfer plates are superimposed in direct surface contact, and finally the lower layer rim is formed. The edge of the upper rim portion is welded to the outer surface of the portion by fillet welding or the like, and the welding line at this time becomes the external seal welding line of the plate laminate. When the plate laminate has an inner seal welding line, the inner seal welding line is formed when the heat transfer plates are laminated to form the plate laminate, and then the outer seal welding line is formed. The manufacturing method according to the second aspect of the present invention embodies such a manufacturing method.
【0014】請求項2の製造方法は、流体の通路口と外
周に板厚方向に屈曲させた縁立て部を有する伝熱プレー
トを、上下2枚の積層される伝熱プレートの通路口周辺
部を溶接接合して内部シール溶接ラインを形成しなが
ら、複数枚を順に積層してプレート積層体を製造する工
程と、製造されたプレート積層体の上下に積層された下
層側の伝熱プレートの縁立て部の外面一部に、この外面
に積層される上層の伝熱プレートの縁立て部の先端を溶
接接合して外部シール溶接ラインを形成する行程を含む
ことを特徴とする。According to a second aspect of the present invention, there is provided a heat transfer plate having a fluid passage opening and a rim portion bent in the thickness direction on the outer periphery, and a peripheral portion of the passage opening of the upper and lower two stacked heat transfer plates. To form a plate laminate by sequentially laminating a plurality of plates while forming an internal seal welding line by welding, and an edge of a lower heat transfer plate laminated above and below the produced plate laminate. The method is characterized in that a part of the outer surface of the upright portion includes a step of welding and joining the tip of the rim portion of the upper heat transfer plate laminated on the outer surface to form an outer seal welding line.
【0015】ここでの内部シール溶接ラインの溶接作業
は、従来の伝熱プレートを1枚ずつ積層して内部シール
溶接ラインをレーザー溶接する作業と同様であるが、縁
立て部を有する伝熱プレートの内部シール溶接ラインの
レーザー溶接は、上下に積層される2枚の伝熱プレート
の内の下層の伝熱プレートの縁立て部上に上層の伝熱プ
レートの縁立て部が重なって、下層の伝熱プレートが上
層の伝熱プレートの高精度な位置決め治具として利用さ
れる。また、外部シール溶接ラインは、内部シール溶接
ラインで複数枚の伝熱プレートを積層した状態で一体化
されたプレート積層体の側面をレーザーで隅肉溶接等し
て形成される。このようなプレート積層体の側面に対し
て行われる外部シール溶接ラインの溶接作業は容易であ
り、プレート積層体側面の溶接不良箇所は補修が可能で
ある。The welding operation of the internal seal welding line here is the same as the conventional operation of laminating the heat transfer plates one by one and laser welding the internal seal welding line. In the laser welding of the internal seal welding line, the rim of the upper heat transfer plate overlaps the rim of the lower heat transfer plate of the two heat The heat transfer plate is used as a highly accurate positioning jig for the upper heat transfer plate. Further, the outer seal welding line is formed by, for example, fillet welding with a laser on the side surface of an integrated plate laminate in a state where a plurality of heat transfer plates are laminated on the inner seal welding line. The welding operation of the outer seal welding line performed on the side surface of the plate laminate is easy, and a defective welding portion on the side surface of the plate laminate can be repaired.
【0016】[0016]
【発明の実施の形態】図1と図2に示される実施の形態
のプレート式熱交換器は、複数枚の伝熱プレート5を積
層して溶接で一体化した完全溶接式のプレート積層体7
を備える。伝熱プレート5は板厚1mm以下の略矩形の
ステンレス鋼板等であり、4隅部に2種の流体の出入口
である通路口6を有する。伝熱プレート5の中央部は波
板状の伝熱部5aであり、伝熱部5aと各通路口6を囲
う外周に連続した矩形枠状の縁立て部5bを一体に有す
る。この伝熱プレート5の所定の複数枚を積層したプレ
ート積層体7の表裏両面に、図6の従来熱交換器と同様
な耐圧フレーム21,22が固定され、一方の耐圧フレ
ーム21の4隅部に流体導入導出用ノズル31〜34が
貫通させて固定され、各ノズル31〜34はプレート積
層体7の対応する通路口6に連通する。積層された複数
枚の伝熱プレート5の間に2種の流体の流体通路P,Q
が交互に形成されて、隣接する流体流路P,Qに2種の
流体が流通する間に両流路P,Qを仕切る伝熱プレート
5の伝熱部5aを介して熱交換が行われる。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A plate heat exchanger according to the embodiment shown in FIGS. 1 and 2 is a completely welded plate laminate 7 in which a plurality of heat transfer plates 5 are laminated and integrated by welding.
Is provided. The heat transfer plate 5 is a substantially rectangular stainless steel plate or the like having a plate thickness of 1 mm or less, and has a passage opening 6 at two corners, which is a port for two kinds of fluids. The central portion of the heat transfer plate 5 is a corrugated heat transfer portion 5a, and integrally has the heat transfer portion 5a and a rectangular frame-shaped rim portion 5b continuous with the outer periphery surrounding each passage opening 6. The same pressure-resistant frames 21 and 22 as the conventional heat exchanger of FIG. 6 are fixed to the front and back surfaces of a plate laminate 7 in which a predetermined plurality of heat transfer plates 5 are laminated. The nozzles 31 to 34 penetrate and are fixed to each other. Fluid passages P, Q for two kinds of fluids between a plurality of stacked heat transfer plates 5
Are alternately formed, and heat exchange is performed via the heat transfer portion 5a of the heat transfer plate 5 that partitions the two flow paths P and Q while the two types of fluid flow through the adjacent fluid flow paths P and Q. .
【0017】図1の熱交換器の図5熱交換器と相違する
点は、伝熱プレート5に縁立て部5bを設けた点と、こ
の伝熱プレート5を積層して溶接する際の溶接箇所を縁
立て部5bの先端箇所に設定した点である。伝熱プレー
ト5の縁立て部5bは、例えば図3に示すように伝熱プ
レート5の裏面側に定角度で傾斜させている。図3に示
される2枚の伝熱プレート5は同一のプレス型でプレス
成形された同一形状品で、積層するときに一方を180
°反転させて双方の波板状伝熱部5aを重合させたとき
に双方間に所定の流体流路が形成されるようにしてあ
る。このような伝熱プレート5は、図示しない既存のブ
レージング式のプレート式熱交換器の伝熱プレートの適
用が可能である。The heat exchanger of FIG. 1 is different from the heat exchanger of FIG. 5 in that a rim portion 5b is provided on the heat transfer plate 5 and that the heat transfer plate 5 is laminated and welded. The point is that the location is set at the tip of the rim portion 5b. The rim portion 5b of the heat transfer plate 5 is inclined at a fixed angle to the back surface side of the heat transfer plate 5, for example, as shown in FIG. The two heat transfer plates 5 shown in FIG. 3 are press-formed with the same press mold and have the same shape.
When the two corrugated heat transfer sections 5a are polymerized by being inverted, a predetermined fluid flow path is formed between them. Such a heat transfer plate 5 can be applied to a heat transfer plate of an existing brazing-type plate heat exchanger (not shown).
【0018】ブレージング式熱交換器は縁立て部を有す
る伝熱プレートの複数枚を縁立て部の間にろう材を介し
て積層して、全体を高温・真空下で加熱してろう材を溶
融させ、各伝熱プレートをろう付け(ブレージング)し
てプレート積層体を構成したもので、積層された上下2
枚の伝熱プレートの縁立て部同士がろう付けされて伝熱
プレートの周縁部をシールする外部シールラインが形成
される。このような伝熱プレートは、ろう付けされるこ
とを前提にした形状であり、ろう付けに適した形状であ
って、他の用途は不適当とされていたが、本発明者は他
の用途を様々に検討した結果、本発明者は、ブレージン
グ式熱交換器の伝熱プレートを完全溶接式のプレート式
熱交換器の伝熱プレートに使用することが可能であり、
外部溶接ラインを特定すれば製造容易で高性能な完全溶
接式のプレート式熱交換器が実現されることを知見し、
以下の本発明を提案する。In the brazing type heat exchanger, a plurality of heat transfer plates having rims are laminated with a brazing material between the rims, and the whole is heated at a high temperature and in a vacuum to melt the brazing material. Each heat transfer plate is brazed (brazed) to form a plate laminate.
The rims of the heat transfer plates are brazed together to form an external seal line that seals the periphery of the heat transfer plate. Such a heat transfer plate has a shape that is premised on being brazed, is a shape suitable for brazing, and is not suitable for other uses. As a result of various studies, the present inventor can use the heat transfer plate of the brazing type heat exchanger as the heat transfer plate of the fully welded plate type heat exchanger,
Knowing that specifying an external welding line will make it easy to manufacture a high-performance, fully-welded plate heat exchanger,
The following invention is proposed.
【0019】すなわち、本発明は図1(B)に示すよう
に複数枚の伝熱プレート5を上下に積層する際に上下2
層の伝熱プレートの下層の伝熱プレート縁立て部5bの
外面に上層の伝熱プレート縁立て部5bの内面を重ね、
プレート積層体7の状態のとき上下2層の伝熱プレート
の下層の伝熱プレート縁立て部5bの外面一部に上層の
伝熱プレート縁立て部5bの先端(図1において下端)
を溶接、例えば隅肉溶接して外部シール溶接ラインLj
を形成する。この隅肉溶接は、プレート積層体7の側面
に露呈する各伝熱プレート5の縁立て部5bの先端ライ
ンに沿ってレーザー光を照射して縁立て部5bの先端部
分を順次に溶融させていく溶接法や、縁立て部5bの先
端ラインに沿って溶接棒等をレーザー光で溶融させる溶
接法が可能である。外部シール溶接ラインLjの溶接
で、プレート積層体7の内部の各流体流路P,Qの端が
気液密にシールされて2種(2種以上も可)の流体の漏
洩や混合が防止される。また、外部シール溶接ラインL
jが単列ラインであるので、プレート積層体7の周縁内
部に図5の熱交換器の2列外部シール溶接ラインに基づ
いて必然的にできるショートパス通路が形成されず、伝
熱プレート5の伝熱性能が良好となる。That is, according to the present invention, when a plurality of heat transfer plates 5 are vertically stacked as shown in FIG.
The inner surface of the upper heat transfer plate rim 5b on the outer surface of the lower heat transfer plate rim 5b of the lower heat transfer plate,
In the state of the plate laminated body 7, the tip of the upper heat transfer plate rim 5b (the lower end in FIG. 1) is partially provided on the outer surface of the lower heat transfer plate rim 5b of the upper and lower two heat transfer plates.
, For example, by fillet welding to form an external seal welding line Lj
To form This fillet welding is performed by irradiating a laser beam along the tip line of the rim portion 5b of each heat transfer plate 5 exposed on the side surface of the plate laminate 7 to sequentially melt the tip portion of the rim portion 5b. Various welding methods and a welding method in which a welding rod or the like is melted with a laser beam along the tip line of the rim portion 5b are possible. By the welding of the outer seal welding line Lj, the ends of the respective fluid passages P and Q inside the plate laminate 7 are sealed in a gas-liquid tight manner, thereby preventing the leakage and mixing of two (or more) fluids. Is done. In addition, external seal welding line L
Since j is a single-line line, a short-path path, which is inevitable based on the two-line external seal welding line of the heat exchanger of FIG. Good heat transfer performance.
【0020】完全溶接式のプレート積層体7の内部に
は、図2に示すように伝熱プレート5の通路口周辺部を
通路口6を囲んだ円形パターンで溶接した内部シール溶
接ラインLiが形成される。そこで、このプレート積層
体7を本発明は次の行程で製造する。An internal seal welding line Li is formed in the complete welded plate laminate 7 by welding the periphery of the passage opening of the heat transfer plate 5 in a circular pattern surrounding the passage opening 6 as shown in FIG. Is done. Therefore, the present invention manufactures the plate laminate 7 in the following steps.
【0021】まず図4に示すように複数枚の伝熱プレー
ト5を1枚ずつ積層し、1枚積層する毎に伝熱プレート
5の平坦な通路口周辺部をレーザー溶接して内部シール
溶接ラインLiを形成する。このレーザー溶接は、下層
の伝熱プレート5の上に上層の1枚の伝熱プレート5を
重ねて積層した状態で行われ。このとき、下層の伝熱プ
レート5の縁立て部5bの外面に上層の伝熱プレート5
の縁立て部5bの内面が嵌着されて位置決めされるた
め、上下2枚の伝熱プレートが相対的に位置ズレするこ
と無く高精度にレーザー溶接される。また、内部シール
溶接ラインLiの溶接作業が、高精度な位置決め治具類
を使用すること無く実行できる。First, as shown in FIG. 4, a plurality of heat transfer plates 5 are stacked one by one, and each time one sheet is stacked, a flat passage opening peripheral portion of the heat transfer plate 5 is laser-welded to form an internal seal welding line. Li is formed. This laser welding is performed in a state in which one upper heat transfer plate 5 is stacked on the lower heat transfer plate 5. At this time, the upper heat transfer plate 5 is attached to the outer surface of the rim portion 5b of the lower heat transfer plate 5.
The inner surface of the rim portion 5b is fitted and positioned, so that the upper and lower two heat transfer plates are laser-welded with high precision without relative displacement. Further, the welding operation of the inner seal welding line Li can be performed without using a high-precision positioning jig.
【0022】所定枚数の伝熱プレート5を内部シール溶
接ラインLiを形成しながら積層してプレート積層体7
を構成すると、プレート積層体7の側面に露呈する各伝
熱プレート5の縁立て部5bの先端ラインを隅肉溶接し
て、プレート積層体7を完成させる。このような隅肉溶
接はプレート積層体7の側面が略平面であり、縁立て部
5bの先端が直線ラインであるので簡単な溶接設備を使
って高精度、迅速に行うことができる。また、外部シー
ル溶接ラインLiの隅肉溶接は、プレート積層体7に耐
圧フレーム21、22を固定してから行うことも可能で
ある。このように溶接された外部シール溶接ラインLi
の一部に仮に溶接不良個所が生じて流体漏れが生じた場
合、プレート積層体7の側面に漏洩流体が流れて、これ
を目視することで外部シール溶接ラインLiにおける溶
接不良箇所が容易かつ正確に分かり、溶接不良個所の迅
速な修復が可能となる。A predetermined number of heat transfer plates 5 are laminated while forming an internal seal welding line Li to form a plate laminate 7.
With this configuration, the front end line of the rim portion 5b of each heat transfer plate 5 exposed on the side surface of the plate laminate 7 is fillet welded to complete the plate laminate 7. Such fillet welding can be performed accurately and quickly using simple welding equipment because the side surfaces of the plate laminate 7 are substantially flat and the leading edge of the rim portion 5b is a straight line. In addition, the fillet welding of the outer seal welding line Li can be performed after the pressure-resistant frames 21 and 22 are fixed to the plate laminate 7. External seal welding line Li thus welded
In the event that a defective portion occurs and a fluid leaks, a leaking fluid flows on the side surface of the plate laminate 7, and by visually observing the leak fluid, the defective portion in the external seal welding line Li can be easily and accurately determined. As a result, it is possible to quickly repair defective welding spots.
【0023】[0023]
【発明の効果】本発明によれば、複数枚の伝熱プレート
を積層したプレート積層体の側面に露呈する伝熱プレー
ト縁立て部の先端部を溶接して外部シール溶接ラインを
形成したので、外部シール溶接ラインが単列ラインでプ
レート積層体内の流体流路にショートパス通路の無い、
したがって、伝熱プレートの伝熱性能の良好な完全溶接
式のプレート式熱交換器が提供できる。また、プレート
積層体の側面の外部シール溶接ラインが簡単な設備で作
業性良く形成することができて、熱交換器の製造コスト
を低減させること可能となる。また、プレート積層体の
側面の隅肉溶接で外部シール溶接ラインを形成する作業
時にプレート積層体の内部が損傷を受けず、そのため、
製造が容易でかつ品質の安定した完全溶接式熱交換器が
提供できる。さらに、プレート積層体の側面に形成され
た外部シール溶接ラインは溶接不良箇所が発生すると、
この溶接不良個所が漏洩流体の目視で早期に検知され、
溶接不良箇所を修復することが容易になる。According to the present invention, the outer seal welding line is formed by welding the end of the heat transfer plate rim which is exposed on the side surface of the plate laminate in which a plurality of heat transfer plates are stacked. The outer seal welding line is a single row line and there is no short path passage in the fluid flow path in the plate laminate,
Therefore, it is possible to provide a plate-type heat exchanger of a perfect welding type having good heat transfer performance of the heat transfer plate. Further, the external seal welding line on the side surface of the plate laminate can be formed with a simple facility with good workability, and the manufacturing cost of the heat exchanger can be reduced. Also, the inside of the plate laminate is not damaged during the work of forming the outer seal welding line by fillet welding on the side surface of the plate laminate, and therefore,
A fully welded heat exchanger that is easy to manufacture and has stable quality can be provided. In addition, when an external seal welding line formed on the side surface of the plate laminate has a defective weld,
This poor welding spot is detected early by visual inspection of the leaked fluid,
It is easy to repair a defective welding location.
【0024】また、上下2枚の伝熱プレートを縁立て部
同士を重ねて積層して内部シール溶接ラインを形成する
ことで、溶接される上下2枚の伝熱プレートの縁立て部
が相互に位置決めするので、高精度な位置決め治具類を
使用することなく内部シール溶接ラインを形成すること
ができて、熱交換器の製造コストの低減が可能となる。Further, by forming the inner seal welding line by laminating the upper and lower heat transfer plates with the rim portions overlapping each other, the rim portions of the two upper and lower heat transfer plates to be welded are mutually connected. Since the positioning is performed, the internal seal welding line can be formed without using a high-precision positioning jig, and the manufacturing cost of the heat exchanger can be reduced.
【図1】(A)は本発明の実施の形態を示すプレート式
熱交換器の一部省略部分を含む正面図、(B)はT1−
T1線の拡大断面図。FIG. 1A is a front view of a plate heat exchanger according to an embodiment of the present invention, including a partly omitted portion, and FIG. 1B is T 1 −
FIG. 4 is an enlarged sectional view taken along line T 1 .
【図2】図1のT2−T2線の拡大断面図。Figure 2 is an enlarged cross-sectional view of T 2 -T 2 line in FIG.
【図3】図1熱交換器における伝熱プレート2枚の分解
斜視図。FIG. 3 is an exploded perspective view of two heat transfer plates in the heat exchanger of FIG. 1;
【図4】図1熱交換器におけるプレート積層体の製造時
の部分断面図。FIG. 4 is a partial cross-sectional view of the heat exchanger in manufacturing the plate laminate.
【図5】従来のプレート式熱交換器の一部省略部分を含
む正面図。FIG. 5 is a front view including a partly omitted portion of a conventional plate heat exchanger.
【図6】図5のT3−T3線に沿う拡大断面図。FIG. 6 is an enlarged sectional view taken along line T 3 -T 3 in FIG. 5;
【図7】図5のT4−T4線に沿う拡大断面図。FIG. 7 is an enlarged sectional view taken along line T 4 -T 4 in FIG. 5;
5 伝熱プレート 5a 伝熱部 5b 縁立て部 6 通路口 7 プレート積層体 Li 内部シール溶接ライン Lj 外部シール溶接ライン P 流体流路 Q 流体流路 Reference Signs List 5 heat transfer plate 5a heat transfer portion 5b rim portion 6 passage opening 7 plate laminate Li internal seal welding line Lj external seal welding line P fluid flow path Q fluid flow path
Claims (2)
せた縁立て部を有する伝熱プレートの複数枚を、各伝熱
プレートの縁立て部を順に重ねた状態で積層したプレー
ト積層体の、上下に積層された下層側の伝熱プレートの
縁立て部の外面一部に、この外面に積層される上層の伝
熱プレートの縁立て部の先端を溶接接合したことを特徴
とするプレート式熱交換器。1. A plate stack in which a plurality of heat transfer plates each having a fluid passage opening and a rim portion bent in the thickness direction on the outer periphery are stacked in a state where the rim portions of the heat transfer plates are sequentially stacked. The tip of the rim of the upper heat transfer plate laminated on this outer surface is welded to a part of the outer surface of the rim of the lower heat transfer plate laminated on the upper and lower sides of the body. Plate heat exchanger.
せた縁立て部を有する伝熱プレートを、上下に積層され
る伝熱プレートの通路口周辺部を溶接接合して内部シー
ル溶接ラインを形成しながら、複数枚を順に積層してプ
レート積層体を製造する工程と、製造されたプレート積
層体の上下に積層された下層側の伝熱プレートの縁立て
部の外面一部に、この外面に積層される上層の伝熱プレ
ートの縁立て部の先端を溶接接合して外部シール溶接ラ
インを形成する行程を含むことを特徴とする特徴とする
プレート式熱交換器の製造方法。2. A heat transfer plate having a passage opening for a fluid and a rim portion bent in the thickness direction on an outer periphery thereof is welded to a periphery of a passage opening of a heat transfer plate which is vertically stacked, and internal seal welding is performed. While forming a line, a step of manufacturing a plate laminate by sequentially laminating a plurality of sheets, and on a part of the outer surface of the rim portion of the lower heat transfer plate stacked above and below the manufactured plate laminate, A method for manufacturing a plate-type heat exchanger, comprising a step of forming an external seal welding line by welding and joining a tip of a rim portion of an upper heat transfer plate laminated on the outer surface.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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JP2000300979A JP2002107090A (en) | 2000-09-29 | 2000-09-29 | Plate-type heat exchanger and producing method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2000300979A JP2002107090A (en) | 2000-09-29 | 2000-09-29 | Plate-type heat exchanger and producing method |
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Publication Number | Publication Date |
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Family
ID=18782577
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JP2000300979A Pending JP2002107090A (en) | 2000-09-29 | 2000-09-29 | Plate-type heat exchanger and producing method |
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JP2007518056A (en) * | 2004-01-09 | 2007-07-05 | アルファ ラヴァル コーポレイト アクチボラゲット | Plate heat exchanger |
KR101326940B1 (en) * | 2011-11-25 | 2013-11-11 | 조형석 | Heat transfer plate, apparatus and method for manufacturing and stacking thereof for the plate type heat exchanger |
JP2015152283A (en) * | 2014-02-18 | 2015-08-24 | 日新製鋼株式会社 | Plate type heat exchanger and method of manufacturing the same |
KR20160077321A (en) * | 2014-12-22 | 2016-07-04 | 재단법인 포항산업과학연구원 | Welding method of plate type heat exchangers |
KR20160096111A (en) * | 2013-12-10 | 2016-08-12 | 스웹 인터네셔널 에이비이 | Heat exchanger with improved flow |
KR20170012283A (en) * | 2014-05-27 | 2017-02-02 | 스웹 인터네셔널 에이비이 | Heat exchanger |
WO2020136863A1 (en) * | 2018-12-28 | 2020-07-02 | 三菱電機株式会社 | Plate-type heat exchanger and heat pump device |
CN116336841A (en) * | 2023-03-31 | 2023-06-27 | 佛山市顺德区鑫雷节能设备有限公司 | Plate heat exchanger and manufacturing method thereof |
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