JPH0646156B2 - Heat exchanger - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a heat exchanger used in, for example, a radiator of an automobile, a condenser of a car cooler, etc. Regarding

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 store heat exchange medium. The heat exchange medium is connected to each of the tanks for heat exchange, 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. 13 and 14. In these figures, (61) is a cross section produced by mold forming. -Shaped resin tank part, (62) is a flat tube, (6
3) 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 edge. In this heat exchanger, the tank (61) and the tube (62) are connected as follows. That is, first, prepare a core portion in which tubes (62) and fins (66) are alternately arranged in advance,
The insertion hole (64) of the header plate (63) is inserted into the tube tip of this core, and the tube (62) is joined to the header plate (63) by brazing or welding after pipe expansion. 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 fitted into the recess (65) so that the lower end surface of the tank portion (61) contacts the O-ring (67), and then the caulking piece (68) around the header plate is bent toward the tank portion. The upper surface of the protrusion (61a) of the tank (61) is pressed and fixed.

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.

It is an object of the present invention to provide a heat exchanger that can solve all of the above problems derived from the connection between the tank portion (61) and the tube (62).

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. On the other hand, the recess is formed on the peripheral surface of the end of the tube so as to prevent the drop, and the end of the tube penetrates the outer wall and the partition wall of the tank to cross the resin filling space and the recess. Is inserted so as to face the filling space, and the tank portion and the tube are joined and fixed by injecting and filling the resin into the filling space so that the concave portion of the tube is in a biting state. The heat exchanger is the main point.

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

Example 1 This example shows the 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. In addition, a spirally continuous groove (21) is formed as a recess for preventing the tube from falling out on the peripheral surface of the circular tube portion (1c).

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 face and faces the heat exchange medium storage space (8), and the spiral groove (21) formed on the circumferential surface of the circular pipe portion (1c) faces the filling space and the groove. The resin is filled in the inside of the pipe, and the rear end of the circular pipe part (1c) almost matches the outer surface of the entry wall (5b) and the front end of the flat pipe part (1a) is the convex part (5c) of the tank part. The reduced diameter portion (1b) of the tube (1) substantially matches the outer surface and the recessed portion (6) of the tank portion (5).
It has been placed in a house.

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, in this embodiment, the convex portions (5c) (5) formed at both ends of the entrance wall (1b) of the tank portion (5).
According to c), the non-existing portion (P) is covered from 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, but the appearance is also good.

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 a cross section with a certain length Formed into a shape. Moreover, protruding insert pieces (4d) (4d) continuous with the intermediate piece are formed at both ends of the intermediate piece (4a) in the longitudinal direction, and one circular retainer is further formed in the insert piece. A hole (4e) is drilled. 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 (1
4) 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, the tube (1), the both ends of which are the entrance walls (5b) of the tank parts (5).
And the partition wall (5d) is inserted and arranged in the insertion hole (9), and the side piece (4) is oriented in a predetermined direction, and both end insertion pieces (4d) are also inserted into the insertion hole (14) to form a framework. Then, the corrugated fins (2) having a fin height slightly higher than the interval between the tubes between the adjacent tubes (1) (1) and between the outermost tube and the side piece (4) are oriented in a predetermined direction. The radiator is placed in a temporary assembly state. 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. Becomes 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 spiral groove (21) is formed in the circular tube portion (1c) of the tube, the resin is filled in the groove to prevent the tube from falling out, ensuring a stronger joint. Will be done. Further, since the resin filling space (7) is sufficiently filled with the resin, there is no possibility of liquid leakage from the joint portion between the tank portion (5) and the tube (1).

Embodiment 2 FIGS. 7 and 8 show another embodiment of the present invention as a heat exchanger for a radiator. In this embodiment, the outer peripheral wall (105a) of the tank portion (105) constitutes four sides of a substantially rectangular cross section, and a partition wall (C-shaped cross section) is formed on the inner surface of the outer wall on the tube (101) side. 105
Since the d) is integrally provided, the resin filling space (107)
Are formed. Moreover, the side piece (104) is formed in a U-shaped cross section, and an ear piece (25a) having a nut fixing hole (25) for attaching the shroud is provided at a predetermined position of the side piece. Further tube (1
The tip of the circular pipe portion (101c) of 01) is projected into the heat exchange medium storage space (108) of the tank portion (105) and is formed along the outer periphery on the peripheral surface of the circular pipe portion (101c). A plurality of independent ring-shaped grooves (121) are engraved. The ring groove (121) is also for preventing the tube (101) from falling out by filling the resin (110) injected into the resin filling space (107) into the groove so as to bite into the groove. Is. In this embodiment, the convex portion (5c) of the tank portion (5) in the first embodiment described above is used.
Although there is no corresponding portion, the presence of the convex portion is not a constituent feature of the present invention. However, it is needless to say that the presence of the convex portion is preferable from the viewpoint of preventing wind escape and deterioration of appearance.

Embodiment 3 FIG. 9 shows still another embodiment of the present invention. In this embodiment, two vertical partition walls (205) that partition the tank portion (205) in the insertion direction of the tube (201).
Since the d ') (205d') is separated and two horizontal partition walls (205d ") (205d") are also provided in the thickness direction of the tank part, the resin filling space (207) becomes the tank. Department (2
It is divided into two chambers in the tube insertion direction at the middle part in the thickness direction of 05). And the circular tube part (20
A plurality of spherical recesses (221) are provided on the peripheral surface of 1a) at positions facing the resin filling space of each chamber. This recess also has the effect of preventing the tube (201) from falling out by the resin (201) biting into the recess.
In this embodiment, the resin (210) is injected into the wall surface of the tank portion (205) and the horizontal partition wall (205) facing the wall surface of the tank portion (205).
This is done from the injection hole (24) provided in d ″). Further, in the figure, (205c) is a convex portion that covers the non-existing portions of the fins at both ends of the heat exchange portion, and the bent portions face each other. Thus, the tank portion (205) is formed to have an L-shaped cross section protruding from the outer wall of the tank portion (205). The configuration shown is advantageous.

Embodiment 4 This embodiment is shown in FIG. 10 to FIG. 12, and is applied to the car cooler capacitor of the present invention.

The condenser handles relatively high pressure refrigerant gas,
Although it must have excellent pressure resistance, by applying the present invention, it is possible to meet the above-mentioned demand by manufacturing the tube and the tank portion that serves as a header at both ends thereof with a hollow extrusion mold material. .

The heat exchanger of this embodiment comprises a pair of upper and lower tank parts (305) (305 ') arranged in parallel, and a plurality of tank parts connected in parallel between them to connect the both ends to the tank part. Tube (301) and pair of outermost left and right side pieces (304)
(304) and the main components.

Each of the tank parts (305) (305 ') is made of a hollow extruded mold material having a circular cross section made of an aluminum material, and has a horizontal partition wall (305d) along the lengthwise direction in the central part of the internal cross section. The inside is divided into a resin filling space (307) and a refrigerant passage (308). In addition, the upper tank part (305) is closed at both ends by lid pieces (300) (300), while the lower tank part (305 ') is provided at both ends with the heat exchange medium inlet (317) and the same outlet (318). ) Is provided, and the refrigerant passage is divided into two passage portions (308a) and (308b) by a vertical partition (305e) that is provided between the central portion of the partition wall (305d) and the inner surface of the peripheral wall. ing. And one end on the inlet side of the passage portion (308b) on the rear side is
Plug-in shield (3 that is an extension of the side piece (304)
It is closed at 04a) (Fig. 14) so that the heat exchange medium flowing from the inlet (317) can be introduced only to the front passage portion (308a) side. On the contrary, the passage portion (308a) on the front side is closed at one end on the outlet side by the same shielding plate (304a) by the other side piece (304), and the outlet (318) is on the rear side. Aisle part (308b)
It is said that it was opened only in the chisel.

The tube (301) is also made of a flat hollow extruded material made of an aluminum material, and both ends thereof are in accordance with the first embodiment, the outer wall and the partition wall (partition wall) of the tank part (305) (305 '). 305d) and a notch (30
9), the end face of which is opened to face the refrigerant passage (308), and the resin filling space (307)
The resin (310) is injected and filled into both (307), so that they are firmly joined and fixed to the tank portions (305) (305 '). In addition, a recess (323) for preventing slipping out is formed at the end of the tube (301), and the erosion of the resin into the recess ensures a stronger bond.

The refrigerant passage (321) in the tube (301) is separated into the front and rear 2 by the partition wall (301a) also provided in the center portion in the width direction.
It is divided into two passage parts (321a) (321b). The lower end of the partition (301a) is connected to the lower tank (30
By closely contacting the vertical partition wall (305e) of 5 '), the front passage and the rear passage of the tank portion (305') and the tube (301) are mutually abutted. It is said to have been communicated. Therefore, the heat exchange medium circuit of this heat exchanger has the front passage portion (3) of the lower tank portion (305 ').
08a) through the front side passage portion (321a) of the tube (301) and then inverted inside the upper tank portion (305), and then from the rear passage portion (321b) of the tube (301) to the lower tank portion (321). 305 ') Rear passage part (308b) and exit (318)
It is supposed to lead to.

The fins (302) for radiating heat between the adjacent tubes (301) (301) are formed as cut-and-raised fins by thinly raising the outer surface of the tube (301) in this embodiment. Incidentally, (314) in FIG. 14 is an insertion hole of the side piece (304).

The assembly of the heat exchanger of this embodiment is also performed according to the case of the above-described first embodiment.

In the above embodiments, the tank parts (5) (105) (205)
Although (305) and (305 ') are formed by using an aluminum hollow extrusion mold material, they are not limited to aluminum. Further, the tube pull-out preventing recess provided at the end of the tube is not limited to the spiral groove (21), the ring groove (121), and the spherical recesses (221) (323), and any other arbitrary The shape of can be adopted. Further, the fins (2) (102) (302) are not limited to corrugated fins and cut-and-raised fins, and plate fins may be used to join the plate fins to tubes by a tube expansion method. Alternatively, a tongue 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 portion and the tube when the tube is inserted, the resin is sufficiently injected into the resin filling space to firmly bond and fix the tube to the tank portion. Tube expansion work and brazing work for joining 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. In addition, since the recess is formed at the end of the tube facing the resin filling space, the resin is filled into the recess to prevent the tube from falling out, and the joining of the tank and the tube is further facilitated. It can be made solid. Furthermore, since the tank part is formed from an extruded mold material, it can be easily manufactured by extruding it long and then cutting it to a specified length. Even if the width of the heat exchange part changes, the cut 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, and it is not necessary to prepare a mold for the tank part for each model, so the tank part The manufacturing cost of the heat exchanger 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.

In addition, since the tank part is made of extruded material, it can be made strong with high pressure resistance, and the connection between the tank part and the tube can be made a strong joint state by the resin filled in the resin filling space. Moreover, since the function of the drop-out preventing recess provided at the end of the tube can ensure a stronger and more reliable joining state, a condenser for a car cooler that has conventionally been provided only with a serpentine type due to the problem of pressure resistance. With respect to the above, by applying the present invention, it is possible to manufacture and provide the structure having the structure shown in the embodiment, and it is possible to greatly expand the selection range of the shape and structure of the heat exchanger.

[Brief description of drawings]

1 to 6 show a first embodiment of the present invention,
The present invention is applied to a radiator. Fig. 1 is a sectional view of an essential part showing a connection state between a tank portion and a tube, Fig. 2 is an overall external perspective view, and Fig. 3 is a tank portion, a tube, and a corrugate. FIG. 4 is a perspective view of an essential part in which the fins and side pieces are disassembled and shown, FIG. 4 is a plan view of the essential part with a part cut away, and FIG. 5 is a sectional view taken along line VV in FIG. 6 is a sectional view taken along line VI-VI in FIG. 1, FIG. 7 and FIG.
FIG. 7 shows a second embodiment of the present invention, which is also applied to a radiator. FIG. 7 is a sectional view of an essential part showing a connection state between a tank portion and a tube, and FIG. 8 is a part of the radiator. FIG. 9 is a perspective view showing the appearance of the third embodiment of the present invention. Similarly, FIG. 10 to FIG. 12 are sectional views showing the connection between the radiator tank and the tube. 4 shows a fourth embodiment of the present invention, in which the present invention is applied to a car cooler capacitor, FIG. 10 is a perspective view of the whole appearance showing a part of the car in a cut state, FIG. FIG. 12 is an exploded perspective view of the tank part, the tube and the side piece, and FIGS. 13 and 14 show a main part of the conventional heat exchanger. FIG. 13 shows the tank part and the tube before connection. First, a sectional perspective view showing the state in an exploded manner
FIG. 4 is a sectional perspective view showing a state after connection. (1) (101) (201) (301) …… Tube, (21)…
… Spiral groove, (121) …… Ring groove, (221) …… Dimple part, (5) (105) (205) (305) (305 ′) …… Tank part, (5d) (105d) (205d ′) ) (205d ″) (305d) ……
Partition wall, (7) (107) (207) (307) ... Resin filling space, (10) (110) (210) (310) ... Resin.

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. A recess for preventing falling is formed on the surface, and the end of the tube is inserted into a state where the end penetrates the tank part outer wall and the partition wall to cross the resin filling space and the recess faces the filling space. At the same time, the heat exchanger is characterized in that the tank portion and the tube are joined and fixed by injecting and filling a resin into the filling space so as to be in a state of biting into the concave portion of the tube.