JPH0646158B2 - Heat exchanger - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger used in, for example, a radiator for an automobile, and more particularly to an improvement in a connecting structure between a tank portion and a tube which constitutes the heat exchanger.

In this specification, the term aluminum is used to include an aluminum alloy.

2. Description of the Related Art A heat exchanger used for the above-mentioned applications, particularly a radiator for an automobile, has a plurality of tubes for heat exchange medium distribution arranged in parallel, and both ends of each tube are heat exchange medium. Each of the tanks is connected to a storage tank, and heat is exchanged between a heat exchange medium flowing through the tubes and an air circulation gap including fins formed between the tubes.

Thus, in such a radiator, a molded product such as a resin has been conventionally used as the tank portion, and the connection between the tank portion and each tube has conventionally required a header plate between the tank portion and the tube. It was generally done with intervention.

An example of such a conventional radiator is shown in FIGS. 9 and 10. In these figures, (61) was made by die molding. Resin tank part, (62) is a flat tube, (63)
Is a header plate that has tube insertion holes (64) at equal intervals in the length direction and has a recess (65) for fitting a tank at the peripheral end. In this heat exchanger, the tank (61) and the tube (62) are connected as follows. That is, first, the tube (62) and the fin (6
Prepare a core part that is set by alternately arranging and 6), insert the charging hole (64) of the header plate (63) into the tube tip of this core, and after brazing or welding the tube (62), header the tube (62). Join to the plate (63). Next, the sealing O-ring (67) is mounted in the peripheral end recess (65) of the header plate (63). Then, the tank portion (61) is so arranged that the lower end surface of the tank portion (61) contacts the O-ring (67).
5), and then the caulking piece (68) around the header plate is bent toward the tank part side to fix it by pressing the upper surface of the protruding part (61a) of the tank part (61).

However, the conventional radiator as described above requires the header plate (63) and the O-ring (67) for connecting the tank portion (61) and the tube (62). The number of parts was large, parts management was troublesome, and the cost was high. In addition, since the tube (62) must be joined to the header plate (63) by pipe expansion, brazing, welding, etc. before mounting the tank part (61), the number of manufacturing steps is large and it takes time to manufacture. Therefore, it was not always satisfactory in terms of productivity.

Moreover, since the tank part (61) is a synthetic resin molded product having a relatively complicated shape, the die cost for its production is expensive,
As a result, there is a drawback that the product cost becomes higher and higher.

An object of the present invention is to provide a heat exchanger having excellent heat exchange efficiency and good appearance, as well as being able to solve the above problems derived from the connection between the tank portion (61) and the tube (62) all at once. To do.

MEANS FOR SOLVING THE PROBLEMS Then, according to the present invention, a tank portion is formed by a hollow extruded material, and a partition wall in the longitudinal direction is provided in the tank portion, so that a resin fixing space for fixing a tube is provided in the tank portion. While being formed, the end of the tube is inserted in a state of penetrating the outer wall of the tank part and the partition wall and traversing the resin filling space, and the tank part and the tube are filled by injecting and filling the resin into the filling space. A heat exchanger characterized in that the heat exchanger is joined and fixed, and the vicinity of the insertion end of the tube is hidden by a convex portion provided in the tank portion in the longitudinal direction.

Embodiment Next, the constitution of the present invention will be explained based on the illustrated embodiment.

This embodiment shows a case where the present invention is applied to a radiator for an automobile.

As shown in FIGS. 1 to 6, in this radiator, a plurality of tubes (1) and corrugated fins (2) are alternately stacked to form a heat exchange section (3), and the heat exchange section (3) is formed. Two side pieces (4) (4) are arranged outside the outermost corrugated fin, and two tank parts (5) are provided at both ends in the length direction of the tube (1).
(5) is arranged, and both ends of each tube (1) are connected to respective tank parts.

The tube (1) is formed of an aluminum electric resistance welded tube, and as shown in FIGS. 1, 3, and 4, the flat tube portion (1a) is formed at an intermediate portion excluding both ends. On the other hand, both ends are expanded into a circular pipe portion (1c) through a reduced diameter portion (1b) over a predetermined length.

The tank portion (5) is formed of an aluminum hollow extrusion material. In this tank portion (5), as shown in FIGS. 1 and 3, in the cross-sectional shape, other three walls of the outer peripheral wall (5a) except the outer wall on the tube (1) side are substantially rectangular. While forming the side, the tube-side outer wall is formed as a retreat wall (5b) in which the middle portion retreats inward. Due to the presence of the retreat wall (5b), a recess (6) is formed on the outside of the retreat wall, and convex parts (5c) (5c) formed by bent portions of the outer wall are formed on both sides of the retreat wall. ing. Further, the tank portion (5) has a partition wall (5d) having a U-shaped cross section in the lengthwise direction, and the partition wall (5d) forms a space enclosed by the outer peripheral wall (5a) of the tank portion into the retreat wall (5b). It is divided into a resin filling space (7) formed between the partition wall (5d) and the other heat exchange medium storage space (8).
Further, the entrance wall (5b) and the partition wall (5d) facing it
The tube insertion holes (9) and (9) each having a diameter substantially equal to the outer diameter of the circular tube portion (1c) of the tube (1) are arranged in a row corresponding to the arrangement interval of the tubes. In each tube (1), the width direction of the flat tube portion (1a) is aligned with the air flow direction, and the circular tube portions (1c) at both ends are set in the entrance wall (5b) of each tank portion (5). And is inserted into the insertion hole (9) of the partition wall (5d) so as to penetrate the retreat wall (5b) and the partition wall (5d) and cross the resin filling space (7). And the tank part (5) through the resin (10) injected and filled into the resin filling space (7).
It is firmly connected and fixed to (5). In this connected state, the tip of the circular tube portion (1c) of the tube (1) is separated from the partition wall (5
d) The opening almost faces the end surface and faces the heat exchange medium storage space (8), and the rear end of the circular pipe portion (1c) substantially matches the outer surface of the retreat wall (5b). Flat tube (1
The front end of a) almost matches the outer surface of the convex part (5c) of the tank,
The reduced diameter portion (1b) of the tube (1) is accommodated in the recess (6) of the tank portion (5).

The resin (10) filled in the resin filling space (7) of the tank portion (5) plays a role of connecting and fixing the tank portion (5) and the tube (1) as described above. The resin (10) is cured in a liquid state after being injected into the resin filling space (7). In this embodiment, the resin is injected through the injection hole (12) provided in one of the end plates (11) that closes the openings (5e) at both ends of the tank (5). As the resin (10), any resin can be adopted as long as it exhibits a sufficient joining force between the tank portion (5) and the tube (1) or has good injection workability, but is particularly preferable. Epoxy resin can be mentioned as an example.

The corrugated fins (2) are made of aluminum and have a corrugated plate-like structure in which one plate is continuously folded back in a curved shape at equal intervals. Preferably, each vertical wall portion has a louver. What is cut and raised is used. This corrugated fin (2) has a fin height slightly higher than the interval between the adjacent tubes (1) and (1), and has a fin length substantially equivalent to the length of the flat tube portion (1a) of the tube. Designed to have. As shown in FIG. 4, heat exchange in which both ends of the fin (2) are matched with both ends of the flat tube portion (1a) and the direction of air flowing between the corrugated fins flows through the tube (1). It is arranged and fixed in a direction orthogonal to the direction of the medium. In the attached state of the fins (2), as shown in FIG. 4, between both ends of the heat exchange part (3), that is, between the front end of the flat tube part (1a) and the rear end of the circular tube part (1c) of the tube (1). A non-existing portion (P) of the fin is generated at. Thus, the non-existing portion (P) is a convex portion (5c) formed at both ends of the retreat wall (1b) of the tank portion (5).
(5c) will cover both sides. Therefore, this causes a so-called wind escape phenomenon that occurs in the non-existing portion (P) of the fin when there is no coating by the convex portion (5c), that is, the circulating air passes through without resistance with little contribution to heat exchange. The phenomenon can be prevented and all the circulating air can be made to pass through the region where the fins (2) are present, which contributes to the improvement of heat exchange efficiency. Not only is the connection between the tube (1) and the tank (5) concealed, it also has a good appearance.

As shown in FIG. 3 and FIG. 5, the side piece (4) is a side piece (4b) (4b) provided on both side edges of a narrow intermediate piece (4a) continuously in a right angle bending state. And a bent piece (4c) (4c) continuously bent to the side piece (4b) at a right angle.
And has a predetermined length Is formed into one. In addition, at both ends of the intermediate piece (4a) in the length direction, a protruding insertion piece (4
d) (4d) is formed, and one circular retaining hole (4e) is formed in this insertion piece. This side piece (4) is also made of aluminum. The side piece (4) is arranged such that the intermediate piece (4a) is located inside, that is, on the side of the heat exchange section (3), and the insertion piece (4d) is placed on the entrance wall (5b) of the tank section (5). ) Corresponding insertion hole (14)
And is joined to the tank part (5) by the resin (10) like the tube (1). Here, the retaining hole (4e) is provided for producing a retaining effect of the side piece (4) by the resin (10) entering the hole (4e). The retaining hole (4e) is not limited to one, and two or more retaining holes (4e) may be provided.
Further, the shape of the hole is not limited to the circular shape, and may be another shape.

In FIG. 2, (15) is a mounting boss for the temperature detecting sensor of the heat exchange medium, and the post-extrusion tank portion (5) is
It is provided after the next processing. Further, (16) is a heat exchange medium inflow pipe, (17) is the same outflow pipe, (18) is a filler neck, (19) is a bracket for mounting the radiator at a desired position, and these are the tubes (1) and It is separately brazed to the tank part (5) before being joined to the tank part (5). Note that (20) is an overflow pipe.

In manufacturing the radiator as described above, first, a tank portion (5) is formed by a hollow extruded mold material having a predetermined length, and then a sensor mounting boss (15) is formed on the tank portion (5) by secondary processing.
The end plate (1
1), the heat exchange medium inflow / outflow pipes (16) (17), the filler neck (18), and the bracket (19) are joined to corresponding parts by brazing. After that, the tank part (5) is
And the tube (1). That is, both ends of the tube (1) are inserted and arranged in the insertion holes (9) of the entrance wall (5b) and the partition wall (5d) of each tank portion (5), and the side piece (4) is oriented in a predetermined direction. A tube is formed by inserting both end insertion pieces (4d) into the insertion holes (14), and then between adjacent tubes (1) (1) and between the outermost tube and the side piece (4). A corrugated fin (2) having a fin height slightly higher than the space between them is inserted in a predetermined direction to make the radiator temporarily assembled. By adopting such an assembling method, the tube (1), the fins (2), the tank portion (5), and the side piece (4) are firmly fixed, and the jigs, tightening bands, etc. which have been conventionally required are unnecessary. become. Then, after that, the tube (1) and the fin (2) are joined and fixed by, for example, a reactive soldering method. As another method, the tube (1) and the fins (2) are alternately arranged and the side pieces (4) are arranged on both sides of the assembly, and the assembly is performed by brazing in advance, and then the tank. It may be inserted into the part (5). Then, the fixing resin (10) is injected from the injection hole (12) of the end plate (11) into the resin filling space (7) of the tank portion (5). At this time, after the resin is filled without any gap by utilizing the heat at the time of joining,
If necessary, it is further heated to cure. After the resin (10) is cured, the tank portion (5), the tube (1) and the side piece (4) are completely joined and fixed through the resin (10). Therefore, a header plate and an O-ring, which are separate components, are no longer required for connection.
Moreover, since the resin filling space (7) is sufficiently filled with resin, there is no possibility of liquid leakage from the joint portion between the tank portion (5) and the tube (1).

7 and 8 show another embodiment of the present invention. In this embodiment, two vertical partition walls (105) partition the tank portion (105) in the tube (101) insertion direction.
Since the d ') (105d') are separated and two horizontal partition walls (105d ") (105d") are also provided in the thickness direction of the tank portion, the resin filling space (107) becomes the tank. Department (1
It is divided into two chambers in the tube insertion direction at the middle part in the thickness direction of 05). The resin (110) is injected into the wall surface of the tank portion (105) and the horizontal partition wall (105 facing the wall surface of the tank portion (105).
This is done from the injection hole (112) provided in d ″) and the convex portions (105c) for concealing the non-existing portion (P ′) of the fins are bent portions (105c ′) of each other. Are formed so as to face each other on the outer wall of the tank portion (105) so as to integrally project.However, regarding the configuration of the convex portion, it is possible to secure a wide heat exchange medium storage space. It is advantageous to adopt the configuration shown in the embodiment of 1. In this embodiment, the side piece (104) is formed in a U-shaped cross section, and the shroud is attached to a predetermined portion of the side piece. Ear piece (25 with nut fixing hole (25) for
a) is provided.

In the above embodiments, the tubes (1) (101) are provided with the circular tube portions (1c) (101c) at both ends of the flat tube portions (1a) (101a) via the reduced diameter portions (1b) (101b). Although the tube has been described as having a shape, the tube is not limited to this, and may have a flat tube portion as a whole, for example. Further, although the tank portions (5) and (105) are shown to be made of the aluminum hollow extrusion mold material, they are not limited to aluminum. Further, the fins (2) (102) are not limited to corrugated fins, and plate fins may be used to join the plate fins to the tube by a tube expansion method.
Alternatively, a cut and raised fin formed by cutting and raising the tube may be used.

EFFECTS OF THE INVENTION As described above, according to the present invention, the tank portion is formed of a hollow extruded mold material, and a partition wall in the length direction is provided inside to form a tank fixing resin filling space. Since the connection between the tube and the tube is made by inserting the tube end into the tank so as to be in a state of traversing the resin-filled space and by injecting and filling the resin into the resin-filled space, a radiator or the like is used. The header plate, which was conventionally required as a separate component for connecting the tank portion and the tube, is unnecessary, and the O-ring is also unnecessary. Therefore, the number of parts is reduced and parts management is facilitated. Moreover, even if there is a gap between the tank and the tube when the tube is inserted, the tube is firmly bonded and fixed to the tank part by the resin sufficiently injected into the resin filling space, so the tank part and the tube are closely or bonded. The tube expansion work and brazing work for making it unnecessary are unnecessary. Moreover, there is no fear that the heat exchange medium leaks due to the presence of the resin. Therefore, the work of connecting the tank portion and the tube can be simplified, and the productivity of the heat exchanger can be improved. Furthermore, since the tank part is formed from an extruded mold material, it can be easily manufactured by extruding it in a long length and then cutting it into a predetermined length. Even if the width dimension of the heat exchange part changes, the cutting length of the tank You can easily respond by simply changing. Moreover, unlike the case of using the conventional resin tank part, it is not necessary to manufacture a complicated and expensive mold for molding it, and it is not necessary to prepare a mold for the tank part for each model. The manufacturing cost of the parts can be reduced, and the cost of the heat exchanger as a whole can be reduced in combination with the decrease in the number of parts.

Furthermore, since the vicinity of the insertion end of the tube into the tank part is hidden by the convex part provided in the tank part in the length direction, the connection part between the tank part and the tube does not appear in the appearance, and it looks good. It can be used as a heat exchanger with good decoration and high quality. Moreover, as shown in the embodiment, in a heat exchanger in which a fin non-existing portion is generated in the vicinity of the insertion end of the tube, the convex portion can prevent air leakage, and all the circulating air can be generated in a region where the fin exists. It also has the effect that a heat exchanger that can be passed through and has high heat exchange efficiency can be realized.

[Brief description of drawings]

1 to 6 show a first embodiment of the present invention,
FIG. 1 is a cross-sectional view of a main part showing a connection state between a tank part and a tube, FIG. 2 is an external perspective view of a radiator to which the present invention is applied, and FIG. 3 shows a tank part, a tube, a corrugated fin and a side piece. FIG. 4 is a perspective view of a disassembled main part, FIG. 4 is a plan view showing the main part of the radiator shown in FIG. 2 with a part thereof cut away, and FIG. 5 is VV in FIG.
6 is a sectional view taken along line VI-VI in FIG. 1, and FIGS. 7 and 8 show a second embodiment of the present invention.
FIG. 7 is a cross-sectional view showing the connection between the tank and the tube, FIG. 8 is a partial external perspective view of the radiator, and FIGS. 9 and 10 show the main parts of a conventional heat exchanger. Then, the ninth
FIG. 10 is a sectional perspective view showing an exploded state of the tank portion and the tube before connection, and FIG. 10 is a sectional perspective view showing the state after connection. (1) (101) …… Tube, (5) (105) …… Tank part, (5c) (105c) …… Convex part, (5d) (105d) (105
d ') (105d ") ... partition wall, (7) (107) ... resin filling space, (10) (110) ... resin, (P) (P') ...
The non-existing part of the fin.

Claims (1)

[Claims] 1. A tank portion is formed of a hollow extruded material, and a partition wall in the longitudinal direction is provided in the tank portion to form a resin fixing space for fixing a tube in the tank portion, and an outer wall and a partition of the tank portion. The end of the tube is inserted in a state of penetrating the wall and traversing the resin filling space, and the tank portion and the tube are joined and fixed by injecting and filling the resin into the filling space. A heat exchanger characterized in that the vicinity of the end is covered by a convex portion provided in the tank portion in the longitudinal direction.