JP6677610B2 - Heat exchanger and method for processing tube used in the heat exchanger - Google Patents

Heat exchanger and method for processing tube used in the heat exchanger Download PDF

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JP6677610B2
JP6677610B2 JP2016179115A JP2016179115A JP6677610B2 JP 6677610 B2 JP6677610 B2 JP 6677610B2 JP 2016179115 A JP2016179115 A JP 2016179115A JP 2016179115 A JP2016179115 A JP 2016179115A JP 6677610 B2 JP6677610 B2 JP 6677610B2
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tube
heat exchanger
width direction
ribs
inward
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JP2018044707A (en
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直久 東山
直久 東山
基之 高木
基之 高木
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Mahle Behr Thermal Systems Japan Ltd
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Keihin Thermal Technology Corp
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Description

本発明は、車両に搭載される車両用空調装置に用いられ、該車両の停車時における空気を冷却して冷風を供給可能な熱交換器及び該熱交換器に用いられ冷媒の流通するチューブの加工方法に関する。
The present invention is used for a vehicle air conditioner mounted on a vehicle, a heat exchanger capable of cooling the air when the vehicle is stopped and supplying cool air, and a tube used for the heat exchanger and through which a refrigerant flows. Related to processing method .

本出願人は、車両に搭載される車両用空調装置に用いられ、車両の停車時においてエンジンが停止した状態で蓄冷材容器に蓄えられた冷熱と空気との熱交換を行うことで冷風を送風可能な蓄冷機能付きエバポレータを提案している（特許文献１参照）。   The present applicant is used for a vehicle air conditioner mounted on a vehicle, and blows cold air by performing heat exchange between air and cold stored in a cold storage material container while the engine is stopped when the vehicle is stopped. A possible evaporator with a cool storage function has been proposed (see Patent Document 1).

この蓄冷機能付きエバポレータは、一組のヘッダタンクと、該ヘッダタンク間に設けられた熱交換コア部とを有し、該熱交換コア部を構成する複数のチューブの間に蓄冷材容器を備えている。この蓄冷材容器の内部には蓄冷材が封入され、隣接する２本のチューブの間にフィンの代わりに配置されると共に、その側板には外側に向かって突出した複数の凸部が形成され、隣接するチューブと前記凸部とが当接した状態でろう付けによって接合される。   This evaporator with a cool storage function has a set of header tanks and a heat exchange core provided between the header tanks, and includes a cool storage material container between a plurality of tubes constituting the heat exchange core. ing. A cold storage material is sealed inside the cold storage material container, and is disposed between two adjacent tubes instead of the fins, and a plurality of convex portions protruding outward are formed on the side plate thereof, Adjacent tubes and the projections are joined by brazing in contact with each other.

特開２０１０−１４９８１４号公報JP 2010-149814 A

本発明は、前記の提案に関連してなされたものであり、蓄冷材の封入された蓄冷材容器を設けることなくエンジン停止時における冷却性能の低下を抑制することが可能な熱交換器及び該熱交換器に用いられるチューブの加工方法を提供することを目的とする。
The present invention has been made in connection with the above-described proposal, and a heat exchanger capable of suppressing a decrease in cooling performance when an engine is stopped without providing a cold storage material container in which a cold storage material is enclosed. An object of the present invention is to provide a method for processing a tube used in a heat exchanger .

前記の目的を達成するために、本発明は、互いに間隔をおいて配置される一組のタンクと、両端部がそれぞれタンクに接続される複数のチューブと、隣接するチューブの間に設けられる複数のフィンとを有し、フィンを通過する空気との間で熱交換を行う熱交換器において、
チューブの内部には、空気の流通方向に沿って並んで冷媒の流通する複数の流路が設けられ、
チューブの長手方向に沿った端部には、長手方向と直交し流通方向となる幅方向に幅狭状となった幅狭部が形成され、
複数の流路のうち少なくとも１つ以上の流路内には、壁部に対して内側へと突出した複数のリブが設けられると共に、幅狭部で内側に向かって壁部が膨出した膨出部を有し、チューブの壁部の外面は、膨出部が設けられた箇所において凹んでおり、
チューブの長手方向及び幅方向と直交する厚さ方向の両側の壁部の各々に、膨出部及び複数のリブが設けられ、
複数のリブは、膨出部から突出していることを特徴とする。
In order to achieve the above object, the present invention provides a set of tanks spaced apart from each other, a plurality of tubes each having both ends connected to the tank, and a plurality of tubes provided between adjacent tubes. And a heat exchanger that exchanges heat with air passing through the fins,
Inside the tube, a plurality of flow passages that circulates the refrigerant provided we are side by side along the direction of flow of air,
At the end along the longitudinal direction of the tube, a narrow portion that is narrow in the width direction that is orthogonal to the longitudinal direction and the distribution direction is formed,
The plurality of channels at least one flow channel out of a plurality of ribs together are provided that protrude inward to the wall, and protruding wall portion inwards narrow part Rise out section have a outer surface of the wall of the tube are recessed in the portion where the bulging portion is provided,
A bulging portion and a plurality of ribs are provided on each of the wall portions on both sides in the thickness direction orthogonal to the longitudinal direction and the width direction of the tube,
A plurality of ribs, characterized that you have to protrude from the bulge portion.

本発明によれば、熱交換器を構成する複数のチューブの内部には、空気の流通方向に沿って並んだ複数の流路が設けられ、この複数の流路のうち少なくとも１つ以上の流路内には、壁部に対して内側へと突出したリブが設けられると共に、内側に向かって壁部の膨出した膨出部が形成される。   According to the present invention, inside the plurality of tubes constituting the heat exchanger, there are provided a plurality of flow passages arranged along the direction of air flow, and at least one of the plurality of flow passages is provided. In the road, a rib protruding inward with respect to the wall portion is provided, and a bulging portion of the wall portion bulging inward is formed.

従って、複数の流路のうちの少なくとも１つ以上の流路内にリブ及び膨出部を設けることで、他の流路と比較して通路断面積を小さくできるため、エンジン停止時においても冷媒を流路内に好適に残留させておくことができる。   Therefore, by providing the rib and the bulging portion in at least one or more of the plurality of flow paths, the cross-sectional area of the path can be reduced as compared with the other flow paths. Can be suitably left in the flow path.

その結果、従来技術に係る熱交換器のようにチューブの間にエンジンが停止した際の冷却を行うための蓄冷材及び蓄冷材容器を設けることなく、リブ及び膨出部を有した流路内に残留している冷媒と空気との間で熱交換を行って冷却させることでエンジン停止時における冷却性能の低下を抑制することができる。   As a result, without providing the cold storage material and the cold storage container for cooling when the engine is stopped between the tubes as in the heat exchanger according to the related art, the inside of the flow path having the ribs and the bulging portion is provided. By performing heat exchange between the refrigerant remaining in the air and the air for cooling, it is possible to suppress a decrease in cooling performance when the engine is stopped.

また、チューブの長手方向に沿った端部に、長手方向と直交し流通方向となる幅方向に幅狭状となった幅狭部を形成し、膨出部を幅狭部に形成するとよい。   In addition, it is preferable that a narrow portion that is narrow in the width direction that is orthogonal to the longitudinal direction and that is the flow direction is formed at an end portion along the longitudinal direction of the tube, and the bulging portion be formed in the narrow portion.

さらに、本発明は、互いに間隔をおいて配置される一組のタンクと、両端部がそれぞれタンクに接続される複数のチューブと、隣接するチューブの間に設けられる複数のフィンとを有し、フィンを通過する空気との間で熱交換を行う熱交換器に適用されるチューブに対してサイジング加工を行うチューブの加工方法であって、
チューブの内部には、空気の流通方向に沿って並んで冷媒の流通する複数の流路が設けられ、
複数の流路のうち少なくとも１つ以上の流路内には、壁部に対して内側へと突出した複数のリブが設けられ、
チューブの長手方向及び幅方向と直交する厚さ方向の両側の壁部の各々に、複数のリブが設けられ、
チューブの加工方法は、
加工用治具を構成する互いに近接離間可能な一対のブロック体の各々に設けられた挿入溝に、チューブの長手方向の端部を挿入する挿入工程と、
挿入溝にチューブの長手方向の端部が挿入された状態の一対のブロック体を互いに接近させる方向に移動させることで、チューブの幅方向の両端部を幅方向内側に向かって押圧し、チューブの長手方向の端部に幅方向で幅狭状となった幅狭部を形成する押圧工程と、を含み、
押圧工程では、チューブの幅方向の両端部への押圧により、幅狭部の複数のリブが設けられた箇所で壁部を内側に向かって湾曲するように塑性変形させて、チューブの厚さ方向の両側の壁部の各々に、内側に膨出した膨出部を形成する。
Furthermore, the present invention has a set of tanks spaced apart from each other, a plurality of tubes each having both ends connected to the tank, and a plurality of fins provided between adjacent tubes, A method of processing a tube that performs sizing processing on a tube applied to a heat exchanger that performs heat exchange with air passing through a fin,
Inside the tube, there are provided a plurality of flow paths through which the refrigerant flows along the air flow direction,
A plurality of ribs protruding inward with respect to the wall portion are provided in at least one or more of the plurality of flow paths,
A plurality of ribs are provided on each of the wall portions on both sides in the thickness direction orthogonal to the longitudinal direction and the width direction of the tube,
How to process the tube
An insertion step of inserting a longitudinal end of the tube into an insertion groove provided in each of a pair of close-separable block bodies constituting a processing jig,
By moving the pair of block bodies in a state where the longitudinal ends of the tube are inserted into the insertion grooves in a direction to approach each other, both ends in the width direction of the tube are pressed inward in the width direction, and the tube A pressing step of forming a narrow portion narrowed in the width direction at the end in the longitudinal direction,
In the pressing step, the wall portion is plastically deformed so as to be curved inward at a portion where the plurality of ribs of the narrow portion are provided by pressing the both ends in the width direction of the tube, and the thickness direction of the tube is increased. Is formed on each of the wall portions on both sides of.

本発明によれば、以下の効果が得られる。   According to the present invention, the following effects can be obtained.

すなわち、熱交換器を構成するチューブに複数の流路が設けられ、この複数の流路のうち少なくとも１つ以上の流路内に、壁部に対して内側へと突出したリブと、内側に向かって壁部を膨出させた膨出部とを設けることにより、リブ及び膨出部を有した流路の通路断面積を他の流路の通路断面積より小さくし、エンジン停止時において冷媒を流路内に残留させておくことができる。その結果、従来技術に係る熱交換器のようにチューブの間にエンジンが停止した際の冷却を行うための蓄冷材及び蓄冷材容器を設けることなく、リブ及び膨出部を有した流路内に残留している冷媒と空気とで熱交換を行って冷却することでエンジン停止時における冷却性能の低下を抑制することができる。   That is, a plurality of flow paths are provided in a tube constituting the heat exchanger, and a rib protruding inward with respect to the wall portion and an inner side in at least one or more of the plurality of flow paths. By providing a bulging portion having a bulging wall portion, the passage cross-sectional area of the flow passage having the rib and the bulging portion is made smaller than the passage cross-sectional area of the other flow passage, and the refrigerant is stopped when the engine is stopped. Can be left in the flow path. As a result, without providing the cold storage material and the cold storage container for cooling when the engine is stopped between the tubes as in the heat exchanger according to the related art, the inside of the flow path having the ribs and the bulging portion is provided. By performing heat exchange between the refrigerant remaining in the air and the air for cooling, it is possible to suppress a decrease in cooling performance when the engine is stopped.

本発明の実施の形態に係る熱交換器の外観斜視図である。It is an external appearance perspective view of the heat exchanger concerning an embodiment of the invention. 図１のＩＩ−ＩＩ線に沿った断面図である。FIG. 2 is a sectional view taken along the line II-II in FIG. 1. 図３Ａは、図２のＩＩＩＡ−ＩＩＩＡ線に沿った断面図であり、図３Ｂは、図３Ａのチューブにおける幅方向端部近傍を示す拡大断面図である。FIG. 3A is a cross-sectional view taken along the line IIIA-IIIA of FIG. 2, and FIG. 3B is an enlarged cross-sectional view showing the vicinity of an end in the width direction of the tube of FIG. 3A. 図４Ａ〜図４Ｃは、チューブの一端部にサイジング加工を行うことで挿入部を形成する場合の製造工程を示す説明図である。4A to 4C are explanatory diagrams showing a manufacturing process in a case where an insertion portion is formed by performing sizing processing on one end of a tube.

本発明に係る熱交換器及び該熱交換器に用いられるチューブの加工方法について好適な実施の形態を挙げ、添付の図面を参照しながら以下詳細に説明する。図１において、参照符号１０は、本発明の実施の形態に係る熱交換器を示す。
BEST MODE FOR CARRYING OUT THE INVENTION A heat exchanger according to the present invention and a method for processing a tube used in the heat exchanger will be described in detail below with reference to the accompanying drawings, showing preferred embodiments. In FIG. 1, reference numeral 10 indicates a heat exchanger according to an embodiment of the present invention.

この熱交換器１０は、図１に示されるように、例えば、その内部に冷媒の流通するエバポレータとして用いられ、一組の第１及び第２ヘッダ（タンク）１２、１４と、前記第１ヘッダ１２と第２ヘッダ１４との間を接続する複数のチューブ１６と、前記チューブ１６の間に設けられ波状に折曲された複数のフィン１８とを含み、前記第１及び第２ヘッダ１２、１４の幅方向と直交する熱交換器１０の厚さ方向（矢印Ａ１方向）に空気が通過することで前記冷媒との熱交換が行われる。   As shown in FIG. 1, the heat exchanger 10 is used, for example, as an evaporator through which a refrigerant flows, and includes a set of first and second headers (tanks) 12, 14 and the first header. The first and second headers 12, 14 include a plurality of tubes 16 connecting between the second header 12 and the second header 14, and a plurality of fins 18 provided between the tubes 16 and bent in a wave shape. When the air passes in the thickness direction (the direction of the arrow A1) of the heat exchanger 10 which is orthogonal to the width direction, heat exchange with the refrigerant is performed.

第１ヘッダ１２は、その一端部に冷媒の供給・排出される導入管２０及び導出管２２が設けられ、その内部が幅方向（矢印Ｂ１、Ｂ２方向）と直交する厚さ方向（矢印Ａ１、Ａ２方向）に２分割されている。第２ヘッダ１４は、第１ヘッダ１２に対して所定間隔離間して略平行に設けられ、その内部は第１ヘッダ１２と同様に厚さ方向（矢印Ａ１、Ａ２方向）に２分割されている。   The first header 12 is provided at one end thereof with an inlet pipe 20 and an outlet pipe 22 through which a coolant is supplied and discharged, and the inside thereof has a thickness direction (arrows A1, B2) perpendicular to the width direction (arrows B1, B2). (A2 direction). The second header 14 is provided substantially parallel to the first header 12 with a predetermined space therebetween, and the inside thereof is divided into two parts in the thickness direction (the directions of the arrows A1 and A2) like the first header 12. .

チューブ１６は、例えば、アルミニウム材料からなる断面扁平状に形成され、所定長さを有した一直線状に形成される。このチューブ１６は、略鉛直方向（図１中、矢印Ｃ１、Ｃ２方向）に延在し、第１及び第２ヘッダ１２、１４の幅方向（矢印Ｂ１、Ｂ２方向）に沿って互いに等間隔離間するように設けられると共に、図２に示されるように、前記第１及び第２ヘッダ１２、１４の厚さ方向（空気の流れ方向）に一対となるように所定間隔離間して２列に設けられる。   The tube 16 is formed, for example, in a flat cross section made of an aluminum material, and is formed in a straight line having a predetermined length. The tube 16 extends in a substantially vertical direction (directions of arrows C1 and C2 in FIG. 1), and is equally spaced from each other along the width direction (directions of arrows B1 and B2) of the first and second headers 12 and 14. As shown in FIG. 2, the first and second headers 12 and 14 are provided in two rows separated by a predetermined distance so as to form a pair in the thickness direction (the direction of air flow). Can be

一方、各チューブ１６の内部には、図３Ａ及び図３Ｂに示されるように、冷媒の流通する複数（例えば、１０本）の流路２４が長手方向（図１及び図２中、矢印Ｃ１、Ｃ２方向）に沿って形成される。この流路２４は、例えば、断面矩形状に形成されチューブ１６の幅方向（矢印Ａ１、Ａ２方向）に沿って互いに等間隔離間するように形成されると共に、該チューブ１６の一端部から他端部まで貫通している。   On the other hand, inside each tube 16, as shown in FIGS. 3A and 3B, a plurality (for example, 10) of flow paths 24 through which the refrigerant flows are arranged in the longitudinal direction (arrows C1 and C1 in FIGS. 1 and 2). C2 direction). The flow path 24 is formed, for example, in a rectangular cross section and is formed so as to be equally spaced apart from each other along the width direction of the tube 16 (directions of arrows A1 and A2), and from one end to the other end of the tube 16. Part.

また、チューブ１６において幅方向端部となる一対の第１流路２６ａ、２６ｂは、その幅方向端部が断面三角形状に形成され、互いに向かい合う内壁面にはそれぞれ複数（例えば、２本ずつ）の第１リブ３０が形成される。この第１リブ３０は、例えば、内壁面から離間する方向に向かって先細となる断面三角形状に形成され、互いに向かい合うように形成されると共に、前記チューブ１６の長手方向（図２中、矢印Ｃ１、Ｃ２方向）に沿って延在している。   The pair of first flow paths 26a and 26b, which are the ends in the width direction of the tube 16, are formed such that the ends in the width direction have a triangular cross section, and a plurality of (for example, two) are formed on the inner wall surfaces facing each other. Is formed. The first ribs 30 are formed, for example, in a triangular cross section tapering in a direction away from the inner wall surface, are formed so as to face each other, and are formed in the longitudinal direction of the tube 16 (arrow C1 in FIG. 2). , C2 direction).

さらに、第１流路２６ａ、２６ｂに対して幅方向内側に隣接した第２流路３２ａ、３２ｂには、互いに向かい合う内壁面に複数（例えば、４本ずつ）の第２リブ３６がそれぞれ形成されると共に、前記チューブ１６の長手方向（図２中、矢印Ｃ１、Ｃ２方向）に沿って延在している。なお、第２リブ３６は、第１リブ３０と同様に断面三角形状に形成される。   Further, in the second flow paths 32a and 32b adjacent to the first flow paths 26a and 26b inward in the width direction, a plurality of (for example, four) second ribs 36 are formed on inner wall surfaces facing each other. At the same time, it extends along the longitudinal direction of the tube 16 (the direction of arrows C1 and C2 in FIG. 2). Note that the second rib 36 is formed in a triangular cross section similarly to the first rib 30.

また、上述した第１及び第２リブ３０、３６は、流路２４内を流れる冷媒の伝熱面積を増やす目的で設けられるものであり、例えば、その数量や断面形状は上述した構成に限定されるものではなく、さらに、第２流路３２ａ、３２ｂに対して幅方向内側となる３つ目以降の流路２４に設けられていてもよい。   The first and second ribs 30 and 36 described above are provided for the purpose of increasing the heat transfer area of the refrigerant flowing in the flow path 24. For example, the number and the cross-sectional shape are limited to the above-described configurations. However, it may be further provided in the third and subsequent flow paths 24 that are located on the inner side in the width direction with respect to the second flow paths 32a and 32b.

このチューブ１６の一端部及び他端部には、図２に示されるように、幅方向（矢印Ａ１、Ａ２方向）に所定幅だけ絞られた幅狭状の一対の挿入部３８ａ、３８ｂが形成される。   As shown in FIG. 2, a pair of narrow insertion portions 38 a and 38 b narrowed by a predetermined width in the width direction (the directions of the arrows A <b> 1 and A <b> 2) are formed at one end and the other end of the tube 16. Is done.

この挿入部３８ａ、３８ｂは、例えば、チューブ１６の一端部及び他端部をそれぞれ幅方向中央に向かって押し潰すことによって形成され、前記一端部及び他端部以外の部位に対して幅方向（矢印Ａ１、Ａ２方向）に所定の潰し代でそれぞれ均等に潰され形成される。そのため、挿入部３８ａ、３８ｂは、チューブ１６において、図３Ａに示されるように、複数の流路２４のうち、幅方向端部から２番目となる第２流路３２ａ、３２ｂが押し潰され、この第２流路３２ａ、３２ｂには、第２リブ３６の形成される壁部４０がそれぞれ内側に向かって断面円弧状に膨出した膨出部４２が形成される。   The insertion portions 38a and 38b are formed, for example, by crushing one end and the other end of the tube 16 toward the center in the width direction, respectively. In the directions indicated by arrows A1 and A2), each of them is evenly crushed at a predetermined crushing margin. Therefore, as shown in FIG. 3A, the insertion sections 38 a and 38 b crush the second flow paths 32 a and 32 b that are the second from the width direction end of the plurality of flow paths 24 in the tube 16, In the second flow passages 32a and 32b, bulging portions 42 are formed in which the wall portions 40 on which the second ribs 36 are formed bulge inward in an arc-shaped cross section.

すなわち、第２流路３２ａ、３２ｂが他の流路２４と比較して幅狭となり、その通路断面積が他の流路２４の通路断面積に対して小さくなる。   That is, the second flow paths 32a and 32b are narrower than the other flow paths 24, and the cross-sectional area of the second flow paths 32a and 32b is smaller than the cross-sectional area of the other flow paths 24.

換言すれば、第２流路３２ａ、３２ｂは、第２リブ３６の形成された一方及び他方の壁部４０が互いに接近するようにそれぞれ内側に向かって断面円弧状に変形して形成される。   In other words, the second flow passages 32a and 32b are formed by deforming inwardly in an arc shape in section so that the one and the other wall portions 40 on which the second ribs 36 are formed approach each other.

そして、図２に示されるように、チューブ１６の挿入部３８ａ、３８ｂがそれぞれ第１及び第２ヘッダ１２、１４の内部へと挿入されろう付け等によって固定されることで、前記第１及び第２ヘッダ１２、１４の内部とチューブ１６の流路２４とが連通する。   Then, as shown in FIG. 2, the insertion portions 38a and 38b of the tube 16 are inserted into the insides of the first and second headers 12 and 14, respectively, and fixed by brazing or the like. The insides of the two headers 12 and 14 communicate with the flow path 24 of the tube 16.

フィン１８は、図１に示されるように、例えば、アルミニウム材料等の薄板を成形することで断面波状に折曲され、第１及び第２ヘッダ１２、１４の幅方向（矢印Ｂ１、Ｂ２方向）に隣接配置された２つのチューブ１６に対して交互に接するように配置されると共に、波状の断面形状で熱交換器１０の厚さ方向（矢印Ａ１、Ａ２方向）に沿って所定幅だけ延在するように形成されている。   As shown in FIG. 1, for example, the fin 18 is bent in a wavy cross section by forming a thin plate of an aluminum material or the like, and the width direction of the first and second headers 12 and 14 (the directions of arrows B1 and B2). Are arranged so as to alternately contact two tubes 16 arranged adjacent to each other, and extend by a predetermined width along the thickness direction (arrow A1, A2 direction) of the heat exchanger 10 in a wavy cross-sectional shape. It is formed so that.

本発明の実施の形態に係る熱交換器１０は、基本的には以上のように構成されるものであり、次にチューブ１６の一端部に対してサイジング加工を行って挿入部３８ａを形成する場合について図４Ａ〜図４Ｃを参照しながら説明する。   The heat exchanger 10 according to the embodiment of the present invention is basically configured as described above. Next, one end of the tube 16 is subjected to sizing to form the insertion portion 38a. The case will be described with reference to FIGS. 4A to 4C.

先ず、サイジング加工に用いられる加工用治具４４について簡単に説明する。この加工用治具４４は、断面長方形状で厚さ中央にチューブ１６の挿入可能な挿入溝４６を有した一対のブロック体４８ａ、４８ｂからなり、前記チューブ１６の幅方向（矢印Ａ１、Ａ２方向）に接近・離間自在に設けられる。   First, the processing jig 44 used for sizing will be briefly described. The processing jig 44 is composed of a pair of block bodies 48a and 48b having a rectangular cross section and an insertion groove 46 into which the tube 16 can be inserted at the center of the thickness. ) Are provided so as to be able to approach and separate freely.

また、ブロック体４８ａ、４８ｂの互いに向かい合う端面５０には挿入溝４６が開口し、幅方向（矢印Ａ１、Ａ２方向）に沿って略同一長さでそれぞれ一直線状に形成されると共に、その断面形状はチューブ１６の断面形状（断面扁平状）に対応して形成されている。   Further, insertion grooves 46 are opened in the end faces 50 of the block bodies 48a and 48b facing each other, and are formed to have substantially the same length along the width direction (the directions of the arrows A1 and A2), and to be linear in shape. Are formed corresponding to the cross-sectional shape (flat cross-section) of the tube 16.

この挿入溝４６は、一方のブロック体４８ａの長さと他方のブロック体４８ｂの長さとを合わせた長さがチューブ１６の幅寸法より短くなるように形成されており、この長さと幅寸法の差とが挿入部３８ａの潰し代となる。   The insertion groove 46 is formed such that the combined length of the one block body 48a and the other block body 48b is shorter than the width dimension of the tube 16, and the difference between the length and the width dimension is different. Are the crushing margins of the insertion portion 38a.

すなわち、一方のブロック体４８ａと他方のブロック体４８ｂとは、互いに向かい合う端面５０を境として対称形状となるように形成される。   That is, the one block body 48a and the other block body 48b are formed to be symmetrical with respect to the end faces 50 facing each other.

次に、上述した加工用治具４４を用いてチューブ１６の一端部に挿入部３８ａをサイジング加工で形成する場合には、図示しない治具等によってチューブ１６を固定した状態とし、その一端部に対してチューブ１６の幅方向外側から加工用治具４４のブロック体４８ａ、４８ｂをそれぞれ接近させる。そして、図４Ａに示されるように、チューブ１６の幅方向端部からブロック体４８ａ、４８ｂの挿入溝４６へと挿入し、さらに互いに接近させる方向へと移動させていく。これにより、ブロック体４８ａ、４８ｂはチューブ１６の幅方向に沿って移動することとなる。   Next, when the insertion portion 38a is formed by sizing at one end of the tube 16 using the processing jig 44 described above, the tube 16 is fixed by a jig or the like (not shown), and On the other hand, the block bodies 48a and 48b of the processing jig 44 are approached from the outside in the width direction of the tube 16, respectively. Then, as shown in FIG. 4A, the tube 16 is inserted into the insertion groove 46 of the block bodies 48a and 48b from the widthwise end, and further moved in a direction to approach each other. Thus, the block bodies 48a and 48b move along the width direction of the tube 16.

さらにブロック体４８ａ、４８ｂを移動させることで、図４Ｂに示されるように挿入溝４６の端部にそれぞれチューブ１６の幅方向端部が当接した状態となり、この状態からさらにブロック体４８ａ、４８ｂを互いに接近させることで前記幅方向端部が互いに接近する方向へと押圧される。その結果、例えば、チューブ１６の幅方向端部にそれぞれ押圧力が付与され、この押圧力は、幅方向内側に向かって圧縮するように付勢され、且つ、チューブ１６の外側がブロック体４８ａ、４８ｂによって規制されているため壁部４０を厚さ方向内側に向かって変形させるように働く。   By further moving the block bodies 48a and 48b, the ends in the width direction of the tube 16 are brought into contact with the ends of the insertion grooves 46, respectively, as shown in FIG. 4B. From this state, the block bodies 48a and 48b are further moved. Are brought close to each other, so that the ends in the width direction are pressed in a direction to approach each other. As a result, for example, a pressing force is applied to each end of the tube 16 in the width direction, and this pressing force is urged to compress inward in the width direction, and the outside of the tube 16 becomes a block body 48a, Because it is regulated by 48b, it works to deform the wall portion 40 inward in the thickness direction.

これにより、チューブ１６へ付与される幅方向内側への押圧力が、第２流路３２ａ、３２ｂにおいて第２リブ３６の形成される方向、すなわち、厚さ方向内側へと逃げることで、前記第２リブ３６の形成される壁部４０が湾曲するように塑性変形して膨出部４２が形成される。   Thereby, the pressing force applied to the tube 16 in the width direction inward escapes in the direction in which the second ribs 36 are formed in the second flow paths 32a and 32b, that is, in the thickness direction, and The bulging portion 42 is formed by plastically deforming the wall portion 40 on which the two ribs 36 are formed so as to be curved.

最後に、図４Ｃに示されるように、一方のブロック体４８ａと他方のブロック体４８ｂとが互いに当接するまで移動することで、チューブ１６の一端部が所定幅だけ潰され膨出部４２の形成された挿入部３８ａが形成され、前記ブロック体４８ａ、４８ｂを互いに離間する方向へと移動させ前記チューブ１６を取り出すことで、前記挿入部３８ａのサイジング加工が完了する。   Finally, as shown in FIG. 4C, one end of the tube 16 is crushed by a predetermined width by moving one block body 48a and the other block body 48b until they come into contact with each other. The inserted portion 38a is formed, and the sizing process of the inserted portion 38a is completed by moving the block bodies 48a and 48b in a direction away from each other and taking out the tube 16.

なお、チューブ１６の他端部に対してサイジング加工を行って挿入部３８ｂを形成する場合も、上述した一端部へのサイジング加工と同様であるため、ここでは詳細な説明は省略する。   The sizing process on the other end of the tube 16 to form the insertion portion 38b is the same as the above-described sizing process on the one end portion, and therefore detailed description is omitted here.

次に、上述したように挿入部３８ａ、３８ｂの形成されたチューブ１６を含む熱交換器１０の動作について説明する。   Next, the operation of the heat exchanger 10 including the tube 16 in which the insertion portions 38a and 38b are formed as described above will be described.

先ず、図示しない車両におけるエンジンが駆動して圧縮機が作動している場合には、図示しない配管を通じて導入管２０から導入された冷媒は、第１ヘッダ１２から複数のチューブ１６の流路２４を通じて下方へと流れ第２ヘッダ１４へと導入される。そして、複数のチューブ１６を通じて第２ヘッダ１４から第１ヘッダ１２へと再び戻った冷媒が導出管２２から排出される。このように、第１ヘッダ１２と第２ヘッダ１４との間で冷媒が複数のチューブ１６における流路２４を循環し、冷媒とフィン１８を通過する空気との間で熱交換がなされ、該空気が冷却されて下流側（矢印Ａ１方向）へと供給される。   First, when an engine in a vehicle (not shown) is driven to operate the compressor, the refrigerant introduced from the introduction pipe 20 through a pipe (not shown) flows through the flow path 24 of the plurality of tubes 16 from the first header 12. It flows downward and is introduced into the second header 14. Then, the refrigerant that has returned from the second header 14 to the first header 12 through the plurality of tubes 16 is discharged from the outlet pipe 22. As described above, the refrigerant circulates through the flow paths 24 in the plurality of tubes 16 between the first header 12 and the second header 14, and heat exchange is performed between the refrigerant and the air passing through the fins 18. Is cooled and supplied to the downstream side (the direction of arrow A1).

次に、車両が停車した状態でエンジンが停止し、それに伴って、圧縮機の作動が停止した場合には、チューブ１６の一端部及び他端部における第２流路３２ａ、３２ｂに膨出部４２が設けられ、他の流路２４と比較して通路断面積が小さく、且つ、その内壁面に複数の第２リブ３６が形成されているため、エンジンが駆動していた際に循環していた冷媒が他の流路２４と比較して第２流路３２ａ、３２ｂから排出されにくく内部に残留している。換言すれば、第２流路３２ａ、３２ｂ内に所定量の冷媒を残留させておくことが可能となる。そのため、エンジンが停止した状態においても、空気がフィン１８及びチューブ１６の間を通過することで、各チューブ１６の第２流路３２ａ、３２ｂに残留している冷媒の冷熱がフィン１８へと伝えられ空気と熱交換されることで冷却され冷風として下流側へと供給される。   Next, when the engine stops in a state where the vehicle is stopped, and the compressor stops operating accordingly, the bulging portions are formed in the second flow paths 32a and 32b at one end and the other end of the tube 16. 42, the passage cross-sectional area is smaller than that of the other passages 24, and the plurality of second ribs 36 are formed on the inner wall surface of the passage, so that they circulate when the engine is driven. The cooled refrigerant is hardly discharged from the second flow paths 32a and 32b as compared with the other flow paths 24 and remains inside. In other words, a predetermined amount of the refrigerant can remain in the second flow paths 32a and 32b. Therefore, even when the engine is stopped, the air passing between the fins 18 and the tubes 16 transmits the cold heat of the refrigerant remaining in the second flow paths 32 a and 32 b of each tube 16 to the fins 18. It is cooled by heat exchange with air and is supplied to the downstream side as cold air.

すなわち、エンジンの停止に伴って圧縮機が停止した状態においても、熱交換器１０を通過する空気が各チューブ１６の第２流路３２ａ、３２ｂに残留している冷媒によって好適に冷却される。   That is, even when the compressor is stopped with the stop of the engine, the air passing through the heat exchanger 10 is appropriately cooled by the refrigerant remaining in the second flow paths 32 a and 32 b of each tube 16.

以上のように、本実施の形態では、熱交換器１０を構成する複数のチューブ１６に幅方向に沿って複数の流路２４を有し、該チューブ１６の一端部及び他端部に形成され第１及び第２ヘッダ１２、１４に挿入される挿入部３８ａ、３８ｂにおいて、幅方向端部から２番目となる第２流路３２ａ、３２ｂに内側に向かって膨出した膨出部４２を形成すると共に、内壁面に複数の第２リブ３６を形成している。   As described above, in the present embodiment, the plurality of tubes 16 constituting the heat exchanger 10 have the plurality of flow paths 24 along the width direction, and are formed at one end and the other end of the tubes 16. In the insertion portions 38a, 38b inserted into the first and second headers 12, 14, bulging portions 42 bulging inward are formed in the second flow passages 32a, 32b, which are the second from the width direction ends. In addition, a plurality of second ribs 36 are formed on the inner wall surface.

そのため、挿入部３８ａ、３８ｂにおける第２流路３２ａ、３２ｂの通路断面積が他の流路２４の通路断面積より小さくなり、エンジン停止時においても一方の挿入部３８ａと他方の挿入部３８ｂとの間となる前記第２流路３２ａ、３２ｂ内に冷媒を好適に残留させておくことが可能となる。その結果、従来技術に係る熱交換器のようにチューブの間にエンジンが停止した際の冷却を行うための蓄冷材及び蓄冷材容器を設けることなく、各チューブ１６の第２流路３２ａ、３２ｂ内に残留している冷媒と空気との熱交換を行って冷却させることでエンジン停止時における冷却性能の低下を抑制することが可能となる。   Therefore, the passage cross-sectional area of the second flow passages 32a and 32b in the insertion portions 38a and 38b becomes smaller than the passage cross-sectional area of the other flow passage 24, and even when the engine is stopped, the one insertion portion 38a and the other insertion portion 38b are not It is possible to keep the refrigerant in the second flow passages 32a and 32b between them. As a result, the second flow passages 32a, 32b of each tube 16 can be provided without providing a cold storage material and a cold storage container for cooling when the engine is stopped between the tubes as in the heat exchanger according to the related art. By performing heat exchange between the refrigerant remaining in the chamber and air to perform cooling, it is possible to suppress a decrease in cooling performance when the engine is stopped.

このように、チューブ１６の間に蓄冷材容器を設ける必要がないことから、部品点数及び製造の削減並びに軽量化を図ることができると共に、全てのチューブ１６の間にフィン１８を設けることができるため、冷媒と空気との伝熱面積を従来の熱交換器より増加させることができ、しかも、前記チューブ１６の間を空気が通過する際に流れを阻害するものがないため通気抵抗を低減することも可能となる。   As described above, since there is no need to provide a cold storage material container between the tubes 16, it is possible to reduce the number of parts, manufacture, and weight, and to provide the fins 18 between all the tubes 16. Therefore, the heat transfer area between the refrigerant and the air can be increased as compared with the conventional heat exchanger, and furthermore, since there is nothing obstructing the flow when the air passes between the tubes 16, the ventilation resistance is reduced. It is also possible.

また、チューブ１６の一端部及び他端部に対してサイジング加工を行って挿入部３８ａ、３８ｂを形成する際、同時に第２流路３２ａ、３２ｂに臨む壁部４０を変形させ膨出部４２を形成することができるため、該膨出部４２を形成するための新たな製造工程や加工コストが増加してしまうことなく好適である。   Further, when sizing processing is performed on one end and the other end of the tube 16 to form the insertion portions 38a and 38b, the wall portion 40 facing the second flow paths 32a and 32b is simultaneously deformed and the swelling portion 42 is formed. Since it can be formed, a new manufacturing process and a processing cost for forming the bulging portion 42 are preferable without increasing.

さらに、第２リブ３６を有した第２流路３２ａ、３２ｂに膨出部４２を形成することで、リブを有していない他の流路２４に膨出部４２を設ける場合と比較し、より通路断面積を小さくすることができると共に、隣接する第２リブ３６の間の表面張力を利用して冷媒を上方（矢印Ｃ２方向）へと移動させることができるため、チューブ１６の上下方向において均等に冷媒を残留させ熱交換を均等に行うことができる。   Furthermore, by forming the bulging portion 42 in the second flow passages 32a and 32b having the second rib 36, compared with the case where the bulging portion 42 is provided in another flow passage 24 having no rib, Since the passage cross-sectional area can be further reduced, and the refrigerant can be moved upward (in the direction of arrow C2) using the surface tension between the adjacent second ribs 36, the refrigerant can be moved in the vertical direction of the tube 16. The refrigerant can be left evenly and heat exchange can be performed evenly.

なお、本発明に係る熱交換器及び該熱交換器に用いられるチューブの加工方法は、上述の実施の形態に限らず、本発明の要旨を逸脱することなく、種々の構成を採り得ることはもちろんである。
Note that the heat exchanger according to the present invention and the method of processing a tube used in the heat exchanger are not limited to the above-described embodiment, and may adopt various configurations without departing from the gist of the present invention. Of course.

１０…熱交換器 １６…チューブ
１８…フィン ２４…流路
３２ａ、３２ｂ…第２流路 ３６…第２リブ
３８ａ、３８ｂ…挿入部 ４２…膨出部
４４…加工用治具 ４８ａ、４８ｂ…ブロック体 DESCRIPTION OF SYMBOLS 10 ... Heat exchanger 16 ... Tube 18 ... Fin 24 ... Flow path 32a, 32b ... Second flow path 36 ... Second rib 38a, 38b ... Insertion part 42 ... Swelling part 44 ... Processing jig 48a, 48b ... Block body

Claims (3)

互いに間隔をおいて配置される一組のタンクと、両端部がそれぞれ前記タンクに接続される複数のチューブと、隣接する前記チューブの間に設けられる複数のフィンとを有し、前記フィンを通過する空気との間で熱交換を行う熱交換器において、
前記チューブの内部には、前記空気の流通方向に沿って並んで冷媒の流通する複数の流路が設けられ、
前記チューブの長手方向に沿った端部には、該長手方向と直交し前記流通方向となる幅方向に幅狭状となった幅狭部が形成され、
前記複数の流路のうち少なくとも１つ以上の流路内には、壁部に対して内側へと突出した複数のリブが設けられると共に、前記幅狭部で内側に向かって前記壁部が膨出した膨出部を有し、前記チューブの前記壁部の外面は、前記膨出部が設けられた箇所において凹んでおり、
前記チューブの前記長手方向及び前記幅方向と直交する厚さ方向の両側の前記壁部の各々に、前記膨出部及び前記複数のリブが設けられ、
前記複数のリブは、前記膨出部から突出していることを特徴とする熱交換器。 A pair of tanks spaced apart from each other, a plurality of tubes each having both ends connected to the tank, and a plurality of fins provided between adjacent tubes, passing through the fins Heat exchanger that exchanges heat with the air
Inside the tube, a plurality of flow passages that circulates the refrigerant provided we are aligned along the flow direction of the air,
At the end along the longitudinal direction of the tube, a narrow portion that is orthogonal to the longitudinal direction and narrowed in the width direction that is the flow direction is formed,
A plurality of ribs projecting inward with respect to the wall portion are provided in at least one or more of the plurality of flow passages, and the wall portion expands inward at the narrow portion. have a bulging portion that has issued, the outer surface of the wall of the tube are recessed in the portion where the bulging portion is provided,
The bulging portion and the plurality of ribs are provided on each of the wall portions on both sides in a thickness direction orthogonal to the longitudinal direction and the width direction of the tube,
Wherein the plurality of ribs, the heat exchanger, characterized that you have to protrude from the bulge portion. 請求項１記載の熱交換器において、
前記膨出部は、複数の流路のうち前記チューブの幅方向端部に設けられた流路と隣接した２番目の流路に形成されることを特徴とする熱交換器。 The heat exchanger according to claim 1 ,
The heat exchanger according to claim 1, wherein the bulging portion is formed in a second channel adjacent to a channel provided at a widthwise end of the tube among the plurality of channels. 互いに間隔をおいて配置される一組のタンクと、両端部がそれぞれ前記タンクに接続される複数のチューブと、隣接する前記チューブの間に設けられる複数のフィンとを有し、前記フィンを通過する空気との間で熱交換を行う熱交換器に適用される前記チューブに対してサイジング加工を行うチューブの加工方法であって、A pair of tanks spaced apart from each other, a plurality of tubes each having both ends connected to the tank, and a plurality of fins provided between adjacent tubes, passing through the fins A method of processing a tube that performs sizing processing on the tube applied to a heat exchanger that performs heat exchange with air to be performed,
前記チューブの内部には、前記空気の流通方向に沿って並んで冷媒の流通する複数の流路が設けられ、Inside the tube, a plurality of flow paths through which the refrigerant flows are provided along the flow direction of the air,
前記複数の流路のうち少なくとも１つ以上の流路内には、壁部に対して内側へと突出した複数のリブが設けられ、A plurality of ribs protruding inward with respect to the wall portion are provided in at least one or more of the plurality of flow paths,
前記チューブの長手方向及び幅方向と直交する厚さ方向の両側の前記壁部の各々に、前記複数のリブが設けられ、The plurality of ribs are provided on each of the wall portions on both sides in the thickness direction orthogonal to the longitudinal direction and the width direction of the tube,
前記チューブの加工方法は、The processing method of the tube,
加工用治具を構成する互いに近接離間可能な一対のブロック体の各々に設けられた挿入溝に、前記チューブの前記長手方向の端部を挿入する挿入工程と、An insertion step of inserting the end of the tube in the longitudinal direction into an insertion groove provided in each of a pair of close-separable block bodies constituting a processing jig,
前記挿入溝に前記チューブの前記長手方向の前記端部が挿入された状態の前記一対のブロック体を互いに接近させる方向に移動させることで、前記チューブの前記幅方向の両端部を前記幅方向内側に向かって押圧し、前記チューブの前記長手方向の前記端部に前記幅方向で幅狭状となった幅狭部を形成する押圧工程と、を含み、By moving the pair of block bodies in a state where the ends in the longitudinal direction of the tube are inserted into the insertion groove in a direction to approach each other, both ends of the tube in the width direction are inward in the width direction. Pressing toward the end, forming a narrow portion narrowed in the width direction at the end in the longitudinal direction of the tube,
前記押圧工程では、前記チューブの前記幅方向の前記両端部への押圧により、前記幅狭部の前記複数のリブが設けられた箇所で前記壁部を内側に向かって湾曲するように塑性変形させて、前記チューブの前記厚さ方向の両側の前記壁部の各々に、内側に膨出した膨出部を形成する、チューブの加工方法。In the pressing step, the wall is plastically deformed so as to be curved inward at a position where the plurality of ribs of the narrow portion are provided by pressing the tube toward the both ends in the width direction. And forming a bulging portion bulging inward on each of the wall portions on both sides in the thickness direction of the tube.
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