JP5276807B2 - Heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat exchanger capable of reducing manufacturing cost and weight. <P>SOLUTION: This heat exchanger comprises a pair of header tanks formed of materials having brazing filler metal layers on outer faces, a plurality of flat heat exchanger tubes 4 disposed between the header tanks and brazed to both the header tanks, and a corrugated fin 5 disposed between the adjacent heat exchanger tubes 4 and brazed to the heat exchanger tubes 4. The heat exchanger tube 4 has upper and lower walls 13, 14, and two side walls 15, 16 disposed over both side edges of the upper and lower walls 13, 14. The heat exchanger tube 4 is formed by bending a metal blank sheet. A joint 24 extending in the longitudinal direction exists at one side edge of one of the upper and lower walls 13, 14 of the heat exchanger tube 4. One side edge of the corrugated fin 5 is shifted from the joint 24 of the heat exchanger tube 4 to an inner side in the width direction of the heat exchanger tube 4. A distance between one side edge of the corrugated fin 5 and the joint 24 is 0.3 mm or longer. <P>COPYRIGHT: (C)2009,JPO&amp;INPIT

Description

  The present invention relates to a heat exchanger, and more particularly, to a heat exchanger used as a condenser, an evaporator, a heater core, an automobile oil cooler, an automobile radiator, and the like of a car air conditioner.

  In this specification, the term “aluminum” includes aluminum alloys in addition to pure aluminum.

  For example, as a heat exchanger used in a condenser of a car air conditioner of a vehicle, a pair of header tanks formed of a material having a brazing filler metal layer on the outer surface and arranged at intervals from each other, A plurality of flat heat exchange tubes that are spaced in the length direction of the header tank and arranged in the width direction in the ventilation direction, and whose both ends are brazed to the header tank, and the width of the heat exchange tube in the ventilation direction And a corrugated fin that is disposed between adjacent heat exchange pipes and brazed to the heat exchange pipes is widely used.

  The heat exchanger tube of the heat exchanger is required not only to have excellent heat exchange efficiency but also to have pressure resistance because a high-pressure gas refrigerant is introduced into the heat exchanger tube. Moreover, in order to reduce the size of the condenser, it is required that the tube wall of the heat exchange tube is thin and the tube height is low.

  As a heat exchange tube excellent in heat exchange efficiency used for the capacitor described above, for example, the one described in Patent Document 1 has been used. The heat exchange tube described in Patent Document 1 spans a pair of flat walls facing each other, two side walls provided across both side edges of both flat walls, and both flat walls between both side walls. A plurality of reinforcing walls extending in the lengthwise direction and spaced apart from each other, and having a plurality of parallel fluid passages therein, wherein the first side wall and the two flat walls Formed integrally, and the second side wall is formed by two side wall forming portions that are integrally formed on the side edge of each flat wall, project to the other flat wall side, and brazed so that the tips are brought into contact with each other Has been.

  Such a heat exchange tube is composed of a single metal plate as a whole, and connects two flat wall forming portions of the same width forming both flat walls, connecting the flat wall forming portions and forming a first side wall. And a side wall forming part that forms a second side wall and a side wall forming part that forms a second side wall, and a side wall forming part that forms a second side wall, and a side wall forming part that is formed integrally with the both side flat wall forming parts. A plate for heat exchange tube production having a reinforcing wall forming part is bent into a hairpin shape at the connecting part, the ends of both side wall forming parts are butted against each other and formed on one flat wall forming part The front end of the reinforcing wall forming portion formed and the front end of the reinforcing wall forming portion formed on the other flat wall forming portion are brought into contact with each other and brazed to each other. And the thickness of the 2nd side wall formed by making two side wall formation parts face each other and brazing is thinner than the thickness of the 1st side wall which consists of a connection part.

  However, when the heat exchange tube described in Patent Document 1 is used in the condenser as described above, if the flying stone hits the second side wall formed of the two side wall forming portions, the second side wall may be damaged by the impact. is there.

  Therefore, in order to solve such a problem, the present applicant previously provided a pair of flat walls facing each other and two side walls provided across both side edges of both flat walls. The first side wall is formed integrally with the two flat walls, the second side wall is formed by combining a plurality of side wall forming portions formed integrally with the side edges of the two flat walls, and the second side wall is A first side wall forming portion formed on a side edge portion of the first flat wall and projecting toward the second flat wall side and having a tip located at an intermediate portion of the height of the second side wall; and a side edge of the second flat wall A second side wall forming portion that is formed on the first flat wall and protrudes toward the first flat wall side and whose tip is located at the middle of the height of the second side wall and is abutted against the tip of the first side wall forming portion; Formed on the outer side in the width direction of the heat exchange pipe of the second side wall forming part in the wall and projecting to the first flat wall side, One end of the first flat wall is engaged with a side edge portion of the outer surface of the first flat wall, the front end portions of the first and second side wall forming portions, the outer surfaces of the first and second side wall forming portions, A third side wall forming part and a heat exchange pipe in which the third side wall forming part and the side edge of the first flat wall are brazed have been proposed (see Patent Document 2).

  The heat exchange tube described in Patent Document 2 is made of a single metal plate as a whole, two flat wall forming portions, a connecting portion that integrally connects both flat wall forming portions and forms a first side wall, The first and second side wall forming portions provided on the side edge opposite to the connecting portion in the flat wall forming portion so as to protrude from the flat wall forming portion, and the connecting portion in the first flat wall forming portion. A plate for manufacturing a heat exchange tube provided with an extension for a third side wall forming part provided by extending the opposite side edge is bent into a hairpin shape on both sides of the connecting part, and the first and first A second side wall forming part is abutted with each other; a third side wall forming part extension part is bent so as to cover the outer surfaces of the first and second side wall forming parts to form a third side wall forming part; Engage the tip of the side wall forming part with the side edge of the outer surface of the first flat wall forming part Making the bent body, and the first side wall forming portion and the second side wall forming portion of the bent body, the first and second side wall forming portions and the third side wall forming portion, and the third side wall forming portion and the first flat wall. It is manufactured by simultaneously brazing the forming part. The heat exchange tube of Patent Document 2 includes the first side wall forming part, the second side wall forming part, and the first and second side wall forming parts in the above-described bent body simultaneously with brazing of other components at the time of manufacturing the heat exchanger. And the third sidewall forming portion, and the third sidewall forming portion and the first flat wall forming portion are simultaneously brazed. And in the manufactured heat exchange pipe, it consists of a brazing part between the 1st flat wall which consists of a 1st flat wall formation part, and the front-end | tip part of the 3rd side wall formation part in a 2nd side wall, and length direction There will be a seam that extends.

By the way, in the bending body mentioned above for manufacturing the heat exchange pipe | tube of patent document 2, it exists in the length direction of a bending body between the front-end | tip part of a 3rd side wall formation part, and the outer surface of a 1st flat wall formation part. There will be a stretch seam. In addition, this seam may be a shallow groove shape. Therefore, when the heat exchanger is manufactured, the molten brazing material melted from the header tank main body material flows along the seam and flows along the contact portion between the bent body and the corrugated fin due to a capillary phenomenon. . As a result, it is necessary to increase the amount of brazing filler metal covering the outer surface of the header tank body material, which increases the material cost, and consequently increases the manufacturing cost of the heat exchanger and increases the weight of the heat exchanger. There is a problem.
JP-A-6-281373 JP 2006-78163 A

  An object of the present invention is to provide a heat exchanger that can solve the above-described problems and can reduce manufacturing costs and weight.

  In order to achieve the above object, the present invention comprises the following aspects.

1) A pair of header tanks formed of a material having a brazing filler metal layer on the outer surface and spaced apart from each other, and a distance in the length direction of the header tank and a width direction between the header tanks. Corrugated fins that are arranged in the direction of ventilation and that are brazed to the heat exchange pipes between the flat heat exchange pipes that are brazed to the header tank at both ends and adjacent heat exchange pipes And the heat exchange pipe has a pair of flat walls facing each other and two side walls provided across both side edges of the two flat walls, and the corrugated fin is a heat exchange pipe. Is brazed to the outer surface of the flat wall ,
The first side wall of the heat exchange pipe is formed integrally with the two flat walls, and the second side wall projects from the other flat wall side at the edge opposite to the first side wall of each flat wall. The first and second side wall forming portions formed integrally with each other and the end portions thereof are brazed to each other, and the width direction outer side portion of the heat exchange tube relative to the first and second side wall forming portions on either one of the flat walls And is brazed to the outer surface of the first and second side wall forming portions, and the one end portion of the other flat wall outer surface faces toward the outer side in the width direction of the heat exchange tube. A third side wall forming portion brazed to an inclined surface inclined to the flat wall side, and the heat exchange pipe integrally connects the two flat wall forming portions and the two flat wall forming portions and The connecting part to be formed and the side edge part opposite to the connecting part in both flat wall forming parts A bent body is obtained by bending the plate for heat exchange tube production comprising the first to third side wall forming portions into a hairpin shape at the connecting portion and caulking all the side wall forming portions in combination. After that, the first to third side wall forming parts are brazed, and the tip of the third side wall forming part and the inclined surface are formed on the outer surface of one flat wall of the heat exchange tube . A heat exchanger formed between the upper end portion in the inclined direction and having a seam portion extending in the length direction of the heat exchange pipe over the entire length ,
A heat exchanger in which one side edge portion of the corrugated fin is shifted inward in the width direction of the heat exchange tube from the joint portion of the heat exchange tube.

  2) The heat exchanger according to 1) above, wherein the distance between one side edge portion of the corrugated fin and the joint portion is 0.3 mm or more.

  3) The corrugated fin is composed of a wave top part, a wave bottom part, a wave top part and a wave bottom part, and a plurality of louvers arranged side by side in the ventilation direction. The deviation length of one side edge portion of the corrugated fin from the outer surface of the side wall on the side where the seam portion of the heat exchange pipe exists is equal to a, the other side edge portion of the corrugated fin, and the other side edge side 1) or 2 satisfying the relationship of a <bc, where b is the distance from the louver at the end of the heat exchanger tube and c is the thickness of the side wall opposite to the side where the seam portion is present in the heat exchange pipe. ) The heat exchanger described.

  4) The heat exchanger according to 3) above, wherein the side edge portion of the corrugated fin on the upstream side in the ventilation direction protrudes upstream of the heat exchange pipe in the ventilation direction.

5) Any one of the above 1)) to 4), wherein the corrugated fin is lower in potential than the surface of the heat exchange pipe to which the corrugated fin is brazed, and the potential difference between them is 40 to 300 mV. The heat exchanger as described in.

  According to the heat exchanger of the above 1), the one side edge of the corrugated fin is shifted inward in the width direction of the heat exchange pipe from the joint of the heat exchange pipe, so that the metal base plate at the time of manufacturing the heat exchanger When the heat exchange tube is manufactured from the bent body and the header tank, the manufactured heat exchange tube and the corrugated fin are brazed together, the molten brazing material that has melted from the material forming the header tank is caused by capillary action. Even if it flows along the seam forming the seam portion in the bent body, the molten brazing material is prevented from flowing along the contact portion between the heat exchange tube and the corrugated fin. Therefore, it becomes possible to reduce the amount of brazing material covering the outer surface of the material forming the header tank, the material cost can be reduced, the manufacturing cost of the heat exchanger can be reduced, and the weight can be reduced. it can.

  According to the heat exchanger of the above 2), during the production of the heat exchanger, the molten brazing material that has melted from the material forming the header tank follows the seam that forms the seam portion in the bent body by capillary action. Even if it flows, the flow of the molten brazing material along the contact portion between the heat exchange pipe and the corrugated fin can be effectively prevented.

  According to the heat exchanger of 3) above, the louver at the end of the corrugated fin opposite to the side where the joint portion of the heat exchange pipe is present is present in the portion corresponding to the fluid passage through which the refrigerant or the like flows in the heat exchange pipe. As a result, a decrease in heat exchange efficiency can be prevented.

  When the heat exchanger of the above 4) is mounted on a car as a condenser for a car air conditioner, for example, even if stones or the like come in, it hits a portion protruding from the heat exchange pipe in the corrugated fin to the upstream side in the ventilation direction. Breakage of the side wall of the exchange pipe can be prevented.

  According to the heat exchanger of 5) above, the corrosion resistance of the heat exchange tube is improved.

  Embodiments of the present invention will be described below with reference to the drawings. In this embodiment, the heat exchanger according to the present invention is applied to a condenser of a car air conditioner using a chlorofluorocarbon refrigerant.

  In the following description, the top and bottom, left and right in FIG. 1 are referred to as top and bottom, left and right, the downstream side in the ventilation direction (the direction indicated by the arrow X in FIG. 1, the right side in FIG. 2) is the front, and the opposite side is the back. Shall.

  FIG. 1 shows the overall configuration of a car air conditioner capacitor to which a heat exchanger according to the present invention is applied, and FIGS. FIG. 4 shows a method for manufacturing a heat exchange tube used for a capacitor.

  In FIG. 1, a capacitor (1) for a car air conditioner includes a pair of aluminum header tanks (2) (3) extending vertically and spaced apart in the left-right direction, and both header tanks (2) ( 3) A plurality of flat aluminum heat exchange pipes (a) which are oriented in the width direction in the ventilation direction and spaced apart in the vertical direction and brazed to both header tanks (2) (3) ( 4) and the aluminum corrugated fins (5) disposed between the adjacent heat exchange tubes (4) and outside the heat exchange tubes (4) at the upper and lower ends and brazed to the heat exchange tubes (4) And side plates (6) disposed on the outer sides of the corrugated fins (5) at both upper and lower ends and brazed to the corrugated fins (5).

  The left header tank (2) is divided into two upper and lower header parts (2a) and (2b) by a partition member (7) above the central part in the height direction, and the right header tank (3) is The upper and lower header parts (3a) and (3b) are partitioned by a partition member (7) below the central part. A fluid inlet (not shown) is formed in the upper header portion (2a) of the left header tank (2), and an inlet member (8) having a fluid inflow path (8a) leading to the fluid inlet is connected to the upper header portion (2a). It is attached. In addition, a fluid outlet (not shown) is formed in the lower header portion (3b) of the right header tank (3), and an outlet member (9) having a fluid outflow passage (9a) communicating with the fluid outlet is provided in the lower header portion (3b). It is brazed.

  The left and right header tanks (2) and (3) are made of an aluminum pipe having a brazing filler metal layer on at least the outer surface, for example, a base plate made of an aluminum brazing sheet having a brazing filler metal layer on both sides is formed into a cylindrical shape, and both side edges A header tank body (11) having a plurality of heat exchange insertion holes, and a header tank body (11) brazed to both ends of the header tank body (11). An aluminum closing member (12) for closing the opening.

  As shown in FIGS. 2 and 3, the heat exchange pipe (4) is made of aluminum, and has flat upper and lower walls (13), (14) (a pair of flat walls) facing each other and having the same wall thickness, A rear side wall (15) (first side wall) that extends over the rear edges of the upper and lower walls (13) and (14) and is formed integrally with the upper and lower walls (13) and (14), and the upper and lower walls (13) and (14) Front side wall (16) (second side wall) formed by combining a plurality of side wall forming portions integrally formed on the front side edge of upper and lower walls (13) and (14), straddling the front side edges of both sides, and both side walls (15) Between the upper and lower walls (13) and (14) between (16) and a plurality of reinforcing walls (17) which are provided at predetermined intervals and extend in the length direction, and are arranged in parallel inside A plurality of fluid passages (18). Although not shown in the figure, all the reinforcing walls (17) are provided with a plurality of communication holes through which the adjacent fluid passages (18) pass so as to form a staggered arrangement as viewed from above. Yes.

  The front side wall (16) is formed integrally with the first side wall forming part (19) formed integrally with the upper wall (13) (first flat wall) and the lower wall (14) (second flat wall). The second side wall forming part (21) and the third side wall forming part (22) are combined and brazed.

  The first side wall forming portion (19) is integrally formed in a downward projecting manner on the front side edge portion of the upper wall (13). The second side wall forming portion (21) is integrally formed on the front side edge of the lower wall (14) so as to protrude upward, and the first side wall forming portion (21) is in contact with the front end of the first side wall forming portion (19). It is brazed to the forming part (19). The tip portions of the first and second side wall forming portions (19) and (21) are butted against each other. That is, the tip end portion of the first side wall forming portion (19) of the upper wall (13) is shaped such that the rear half portion is cut off, and the second side wall forming portion (21) of the lower wall (14). The front end of the first side wall is shaped such that the front half is cut off, and the protrusion (19a) of the first side wall forming part (19) is in the cut out part (21b) of the second side wall forming part (21). The projecting portion (21a) of the second side wall forming portion (21) is fitted into the notched portion (19b) of the first side wall forming portion (19).

  The third side wall forming portion (22) is integrally formed on the front side edge of the lower wall (14) so as to project upward from the second side wall forming portion (21), and is integrally formed with the first and second side wall forming portions. (19) Along the outer surface of (21), its front end is engaged with an inclined surface (23) formed at the front edge of the outer surface of the upper wall (13) and inclined downward toward the front. In this state, the entire outer surface of the first and second side wall forming portions (19) and (21) and the inclined surface (23) of the upper wall (13) are brazed. And on the upper surface of the heat exchange pipe (4) to which the corrugated fin (5) is brazed, the direction of inclination of the tip of the third side wall forming part (22) and the inclined surface (23) of the upper wall (13) A seam portion (24) formed between the upper end portion and formed by a brazing portion extending in the length direction of the heat exchange pipe (4) exists over the entire length. Note that the seam portion (24) may have a shallow groove shape.

  The reinforcing wall (17) is a reinforcing wall projection (25) (26) integrally formed in a raised shape below the upper wall (13) and a reinforcing wall integrally formed in a raised shape above the lower wall (14). The projecting ridges (27) and (28) are formed by brazing the tips with each other being butted together. On the upper wall (13) and lower wall (14), two types of reinforcing wall projections (25) (26) and (27) (28) with different thicknesses are formed alternately in the front-rear direction. The thick reinforcing wall ridges (25) on the upper wall (13) and the thin reinforcing wall ridges (28) on the lower wall (14) are brazed, and the upper wall (13) The thin reinforcing wall projection (26) and the thick reinforcing wall projection (27) on the lower wall (14) are brazed. Hereinafter, the thick reinforcing wall ridges (25) and (27) on both the upper and lower walls (13) and (14) are referred to as first reinforcing wall ridges, respectively, and the thin reinforcing wall ridges (26) ( 28) shall be called the second reinforcing wall projections. The first reinforcing wall projections (25) and (27) of the upper and lower walls (13) and (14) are respectively extended in the length direction thereof and the second reinforcing wall of the other wall (14) and (13). Concave grooves (29) and (31) into which the tips of the convex protrusions (28) and (26) are fitted are formed over the entire length. And the front-end | tip part of the 2nd reinforcement wall protruding item | line (28) of a lower wall (14) is in a lower wall (in the groove | channel (29) of the protruding item | line (25) of the 1st reinforcement wall member of an upper wall (13). 14) In the state where the tip of the second reinforcing wall projection (26) of the upper wall (13) is press-fitted into the groove (31) of the first reinforcing wall projection (27) of 14), both reinforcements Wall ridges (25) (28) and (26) (27) are brazed.

  The width of the corrugated fin (5) in the front-rear direction (ventilation direction) is equal to the width of the heat-exchange pipe (4) in the air-flow direction (front-rear direction), and the front edge is the joint of the heat exchange pipe (4) ( 24) is disposed so as to be shifted to the rear side (the inner side in the width direction of the heat exchange pipe (4)) from the portion where 24) exists. The distance (L) between the front edge of the corrugated fin (5) and the joint portion (24) is preferably 0.3 mm or more. And the rear side edge part (side edge part on the upstream side in the ventilation direction) of the corrugated fin (5) protrudes rearward from the heat exchange pipe (4). Further, as is well known, the corrugated fin (5) includes a wave crest portion, a wave bottom portion, and a connecting portion that connects the wave crest portion and the wave bottom portion, and a plurality of louvers (32) are formed side by side in the ventilation direction in the connecting portion. Yes. Here, the rear side of the front edge of the corrugated fin (5) from the front surface (outer surface) of the front side wall (16) on the side where the seam portion (24) of the heat exchange tube (4) exists (the heat exchange tube (4 ) In the width direction) is a, the distance between the rear edge of the corrugated fin (5) and the louver (32) at the rear end is b, and the wall thickness of the left side wall (15) is c In this case, it is preferable that the relationship of a <bc is satisfied. In this case, the louver (32) of the rear end of the corrugated fin (5) (the end of the corrugated fin (5) opposite to the side where the joint (24) of the heat exchange pipe (4) exists) It exists in the range of the front-back direction of the end fluid channel | path (18), and the fall of heat exchange efficiency is prevented. Furthermore, the corrugated fin (5) is lower in potential than the surface to which the corrugated fin (5) in the heat exchange pipe (4) is brazed, and the potential difference between the two is preferably 40 to 300 mV. .

  The capacitor (1) is manufactured by the method described below.

  First, a pair of aluminum header tank body materials having at least a brazing filler metal layer on the outer surface, a closing member (12), a plurality of aluminum corrugated fins (5), a side plate (6), an inlet member (8), and an outlet A member (9) is prepared. A plurality of pipe insertion holes are formed in the header tank body material.

  Further, a bent body (40A) for making the heat exchange tube (4) is obtained by the method described below using the plate (40) for producing the heat exchange tube shown in FIG.

  The plate for heat exchange pipe production (40) is formed by rolling a rolling base plate made of an aluminum brazing sheet having a brazing filler metal layer on both sides, and the upper and lower walls (13) (14). Flat upper wall forming part (41) (flat wall forming part) and lower wall forming part (42) (flat wall forming part) having the same width and the same thickness as each other, and upper and lower wall forming part (41) (42) The connecting part (43) that connects the two together and forms the rear side wall (15), and the side opposite to the connecting part (43) in the upper wall forming part (41) and the lower wall forming part (42) First and second side wall forming parts (19) and (21) which are integrally formed in a raised shape above the side edges of the first side wall and form the front side wall (15), and a connecting part (43) in the lower wall forming part (42) Is a third side wall forming portion extension (44) formed by extending the opposite side edge (front side edge) outward (forward) in the front-rear direction, and forming an upper wall forming portion (41) and a lower wall. Part (42) A plurality of first and second ridges for reinforcing wall (25), (26), (27), and (28) integrally formed in an upwardly raised shape at a predetermined interval in the rear direction, and an upper wall forming portion (41) First reinforcing wall ridge (25), lower wall forming portion (42) second reinforcing wall ridge (28), and lower wall forming portion (42) first reinforcing wall ridge (27) and the protrusions (26) for the second reinforcing wall of the upper wall forming portion (41) are in positions that are symmetrical with respect to the center line in the front-rear direction of the connecting portion (43).

  An inclined surface (23) inclined upward in the width direction outward is formed at the edge of the lower surface of the lower wall forming portion (42) on the first side wall forming portion (19) side. The first and second side wall forming portions (19) and (21) of the upper and lower wall forming portions (41) and (42) are respectively provided with a protruding portion (19a) (21a) and a notch portion (19b) (21b) at the tip portion. A projecting portion (19a) of the first side wall forming portion (19) of the upper wall forming portion (41) and a notch portion (21b) of the second side wall forming portion (21) of the lower wall forming portion (42). ), And a cutout portion (19b) of the first side wall forming portion (19) of the upper wall forming portion (41) and a protruding portion (21a) of the second side wall forming portion (21) of the lower wall forming portion (42) Are in positions that are symmetrical with respect to the center line of the connecting portion (43) in the front-rear direction. Further, the dimensions of the first and second side wall forming portions (19) and (21), that is, the height, the overall thickness, and the thicknesses of the protruding portions (19a) and (21a) are the same. A concave groove (29) into which the second reinforcing wall protrusion (28) of the lower wall forming part (42) is press-fitted into the front end surface of the first reinforcing wall protrusion (25) of the upper wall forming part (41). A recessed groove (2) in which the second reinforcing wall ridge (26) of the upper wall forming portion (41) is press-fitted into the tip surface of the first reinforcing wall ridge (27) of the lower wall forming portion (42). 31) is formed. The dimensions of the first reinforcing wall ridges (25) of the upper wall forming portion (41) and the first reinforcing wall ridges (27) of the lower wall forming portion (42), that is, the height, thickness, and concave grooves ( 29) The width of (31) and the depth of the concave grooves (29), (31) are the same. In addition, the dimensions, that is, the height and thickness of the second reinforcing wall projection (26) of the upper wall forming portion (41) and the second reinforcing wall projection (28) of the lower wall forming portion (42) are the same. It is. The thickness of the covering wall forming portion (24) is equal to the thickness of the upper and lower wall forming portions (42) and (22).

  In addition, by rolling a rolling base plate made of an aluminum brazing sheet provided with a brazing material layer on both sides, an upper wall forming part (41), a lower wall forming part (42), a connecting part (43), a first and a second The second side wall forming portions (19), (21), the third side wall forming portion extension (44), and the reinforcing wall ridges (25) (26) (27) (28) are integrally formed. The entire surface excluding the side surface of the first side wall forming portion (19) of the upper wall forming portion (41) and the tip end surface of the third side wall forming portion extension (44) is covered with a brazing material layer.

  Further, in the above, the rolling base plate is composed of an aluminum brazing sheet provided with a brazing material layer on both sides, but is not limited thereto, and the brazing material is formed on one side of a core material made of an Al-Mn alloy. It may be made of an aluminum brazing sheet provided with a layer and provided with a sacrificial corrosion layer made of an Al—Zn alloy on the other surface. In this case, the brazing material layer surface is the surface on which the first and second side wall forming portions (19), (21) and the reinforcing wall projections (25), (26), (27), (28) are formed.

  Then, as shown in FIG. 5, the plate (40) for manufacturing the heat exchange tube is sequentially bent on the left and right sides of the connecting portion (43) by roll forming (see FIG. 5 (a)), and finally. Folded into a hairpin shape to fit the protrusions (19a) and (21a) of the first and second side wall forming portions (19) and (21) with the notch portions (21b) and (19b), and the convexity for the second reinforcing wall The tips of the strips (26) and (28) are press-fitted into the concave grooves (31) and (29) of the first reinforcing wall projections (27) and (25).

  Next, the third side wall forming portion extension 44 is bent so that it extends along the outer surfaces of the first and second side wall forming portions 19, 21, and the tip portion thereof is the upper wall forming portion 22. Is engaged with the inclined surface (23) to form a third side wall forming portion (22) to obtain a bent body (40A) (see FIG. 5 (b)). Here, in the bent body (40A), the tip of the third side wall forming portion (22) and the outer surface of the upper wall forming portion (41), that is, the tip of the third side wall forming portion (22) and the inclined surface (23). A seam (45) extending in the length direction of the bent body (40A) exists between the upper end portion in the inclination direction.

  Next, a pair of header tank body materials are arranged at intervals, and closing members (12) are arranged at both ends of both header tank body materials. Further, the folded bodies (40A) and the fins (5) are alternately arranged, and both ends of the folded body (40A) are inserted into the pipe insertion holes of the header tank body material. At this time, the front edge of the corrugated fin (5) is positioned more than the joint (45) between the tip of the third side wall forming part (22) of the bent body (40A) and the outer surface of the upper wall forming part (41). Shift backwards 0.3 mm or more. Further, the edge of the corrugated fin (5) on the third side wall forming part (22) side is bent from the outer surface of the third side wall forming part (22) on the side where the seam (45) of the bent body (40A) is present. The length of the body (40A) inward in the width direction is a, the distance between the side edge of the corrugated fin (5) on the connecting portion (43) side and the louver (32) at the end of the connecting portion (43) side Where b is the thickness of the connecting portion (43) and c is the thickness of the connecting portion (43), the relationship of a <bc is satisfied.

  Further, a side plate (6) is disposed outside the corrugated fins (5) at both ends, and an inlet member (8) and an outlet member (9) are further disposed. Thereafter, these are heated to a predetermined temperature, the tip portions of the first and second side wall forming portions (19) and (21) are brazed to each other, and the third side wall forming portion (24) is fixed to the first and second side portions. The front side wall (16) is formed by brazing the outer surface of the side wall forming portions (19) and (21) and the inclined surface (23) of the upper wall (13). Further, the reinforcing wall (17) is formed by brazing the tip portions of both reinforcing wall projections (25) (28) and (26) (27) using the brazing material layer, and the connecting portion The rear wall (15) is formed by (43), the upper wall (13) is formed by the upper wall forming portion (41), and the lower wall (14) is formed by the lower wall forming portion (42), respectively. (4) is manufactured. At the same time, the header tank body (11) is manufactured from the header tank body material, and the header tank (2) (3) is manufactured by the header tank body (11) and the closing member (12). 4) and header tank (2) (3), heat exchange pipe (4) and corrugated fin (5), corrugated fin (5) and side plate (6), and header tank (2) (3) and inlet member ( 8) Braze (9) and the outlet member simultaneously. Thus, the capacitor (1) is manufactured.

  At the time of batch brazing of all the parts in manufacturing the capacitor (1) described above, the edge on the third side wall forming part (22) side of the corrugated fin (5) is the third side wall forming part of the bent body (40A). (22) and the upper surface forming portion (41) of the inclined surface (23) of the inclined surface (23) from the joint (43) side with respect to the joint (45) is shifted from the header tank body material Even if the molten brazing filler metal flows along the seam (45) due to capillary action, the molten brazing filler metal flows along the contact portion between the heat exchange pipe (4) and the corrugated fin (5). Is prevented. Therefore, it is possible to reduce the amount of brazing material covering the outer surface of the material forming the header tank (2) (3), and the material cost can be reduced, and the manufacturing cost of the capacitor (1) can be reduced. The weight of the capacitor (1) can be reduced.

It is a whole perspective view showing an embodiment of a capacitor to which a heat exchanger of this invention is applied. It is an AA line expanded sectional view of FIG. It is a principal part enlarged view of the heat exchange pipe | tube of FIG. It is a front view of the plate for a heat exchange tube manufacturing used for manufacturing the heat exchange tube of the capacitor | condenser of FIG. It is a figure which shows a part of process of manufacturing the heat exchange pipe | tube of the capacitor | condenser of FIG.

(1): Capacitor (heat exchanger)
(2) (3): Header tank
(4): Heat exchange pipe
(5): Corrugated fin
(13): Upper wall (flat wall)
(14): Lower wall (flat wall)
(15): First side wall
(16): Second side wall
(19): First side wall forming part
(21): Second side wall forming part
(22): Third side wall forming part
(23): Inclined surface
(24): Seam
(32): Louver
(40): Plate for heat exchanger tube production
(40A): Folded body
(41): Upper wall forming part
(42): Lower wall forming part
(43): Connection part

Claims (5)

A pair of header tanks formed of a material having a brazing filler metal layer on the outer surface and spaced apart from each other, and a distance in the length direction of the header tank between the header tanks and a ventilation direction in the width direction A plurality of flat heat exchange pipes that are disposed toward the opposite ends and brazed to the header tank, and corrugated fins that are disposed between adjacent heat exchange pipes and brazed to the heat exchange pipes. The heat exchange pipe has a pair of flat walls facing each other and two side walls provided across both side edges of the flat walls, and the corrugated fins are flat on the heat exchange pipe. Brazed to the outside wall ,
The first side wall of the heat exchange pipe is formed integrally with the two flat walls, and the second side wall projects from the other flat wall side at the edge opposite to the first side wall of each flat wall. The first and second side wall forming portions formed integrally with each other and the end portions thereof are brazed to each other, and the width direction outer side portion of the heat exchange tube relative to the first and second side wall forming portions on either one of the flat walls And is brazed to the outer surface of the first and second side wall forming portions, and the one end portion of the other flat wall outer surface faces toward the outer side in the width direction of the heat exchange tube. A third side wall forming portion brazed to an inclined surface inclined to the flat wall side, and the heat exchange pipe integrally connects the two flat wall forming portions and the two flat wall forming portions and The connecting part to be formed and the side edge part opposite to the connecting part in both flat wall forming parts A bent body is obtained by bending the plate for heat exchange tube production comprising the first to third side wall forming portions into a hairpin shape at the connecting portion and caulking all the side wall forming portions in combination. After that, the first to third side wall forming parts are brazed, and the tip of the third side wall forming part and the inclined surface are formed on the outer surface of one flat wall of the heat exchange tube . A heat exchanger formed between the upper end portion in the inclined direction and having a seam portion extending in the length direction of the heat exchange pipe over the entire length ,
A heat exchanger in which one side edge portion of the corrugated fin is shifted inward in the width direction of the heat exchange tube from the joint portion of the heat exchange tube. The heat exchanger according to claim 1, wherein a distance between one side edge portion of the corrugated fin and the joint portion is 0.3 mm or more. The corrugated fin comprises a wave crest, a wave bottom, a wave crest and a wave bottom, and a plurality of louvers arranged side by side in the ventilation direction, and the heat exchange pipe and the corrugated fin have the same width in the ventilation direction The length of deviation of one side edge portion of the corrugated fin from the outer surface of the side wall on the side where the seam portion of the heat exchange pipe exists is a, the other side edge portion of the corrugated fin, and the end on the other side edge side. 3. The relationship according to claim 1 or 2, wherein b is a distance from the louver and c is a thickness of the side wall opposite to the side where the seam portion is present in the heat exchange pipe. Heat exchanger. The heat exchanger according to claim 3, wherein the side edge portion of the corrugated fin on the upstream side in the ventilation direction protrudes upstream of the heat exchange pipe in the ventilation direction. The heat according to any one of claims 1 to 4, wherein the corrugated fin is lower in potential than the surface of the heat exchange pipe to which the corrugated fin is brazed, and the potential difference between the two is 40 to 300 mV. Exchanger.

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