JPH0646155B2 - Heat exchanger - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a heat exchanger used in, for example, a radiator of an automobile or a condenser of a car cooler, and more particularly, to an improvement in a connecting structure between a tank portion and a tube constituting the heat exchanger. 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. 15 and 16. In these figures, (61) is the cross section produced by die molding. -Shaped resin tank part, (62) has a flat tube, (63) has tube insertion holes (64) at equal intervals in the length direction, and has recesses (65) for fitting a tank at the peripheral edge. It is a header plate having. In this heat exchanger, the tank (61) and the tube (62) are connected as follows.
That is, first, prepare a core part in which tubes (62) and fins (66) are alternately arranged in advance and insert the insertion hole (64) of the header plate (63) into the tube tip of this core to expand the tube. The tube (62) is joined to the header plate (63) by attachment or welding. 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 is in contact with 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 protruding portion (61a) of the tank portion (61) is pressed and fixed.

Problems to be Solved by the Invention However, in the conventional radiator as described above, the tank part is
Header plate for connection between (61) and tube (62)
Since (63) and O-ring (67) are required, the number of parts is increased, and parts management is troublesome and costly.
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 high, and the product cost is further increased.

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 part (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. 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. The gist is a heat exchanger characterized by being joined and fixed.

Embodiments Next, the structure of the present invention will be described based on illustrated embodiments.

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 tube (1) and a corrugated fin (2) are alternately laminated in a plurality of stages to form a heat exchange section (3). Two side pieces (4) on the outside of the outermost corrugated fin
(4) is provided, two tank parts (5) and (5) are provided at both ends of the tube (1) in the longitudinal direction, and both ends of each tube (1) are It is connected to the tank section.

The tube (1) is formed of an aluminum electric resistance welded pipe, and as shown in FIGS. 1, 3, and 4, the flat pipe 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 mold material. This tank part (5) has a cross-sectional shape as shown in FIGS.
The three walls except the outer wall on the tube (1) side of (5a) form three sides of a substantially rectangular shape, and the middle part of the outer wall on the tube side retreats inward so that the retreat wall (5b) Has been made. Due to the presence of this entry wall (5b), a recess is formed outside the entry wall.
(6) is formed, and projections (5c) (5c) formed by bent portions of the outer wall are formed on both sides of the retreat wall. Further, the tank part (5) has a partition wall (5d) having a U-shaped cross section in the lengthwise direction, and the partition wall (5d) forms an enclosed space by the tank part outer peripheral wall (5a), and the entrance 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 the entrance wall (5b) are provided with tube insertion holes (9) (9) 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 intervals of the tubes. And each tube (1), the flat tube portion (1a) width direction is aligned with the air flow direction, the circular pipe portion (1c) at both ends of each tank portion
By being inserted into the insertion hole (9) of the entrance wall (5b) and the partition wall (5d) of (5), the resin filling space (7) that penetrates the entrance wall (5b) and the partition wall (5d) And is firmly connected and fixed to the tank portions (5) and (5) through the resin (10) injected and filled in the resin filling space (7). In this connection state, the tip of the circular tube portion (1c) of the tube (1) substantially coincides with the end face of the partition wall (5d), and its opening faces the heat exchange medium storage space (8), and The rear end of the pipe section (1c) almost coincides with the outer surface of the retreat wall (5b) and the flat tube section (1c)
The front end of a) is substantially aligned with the outer surface of the convex portion (5c) of the tank portion, and the reduced diameter portion (1b) of the tube (1) is accommodated in the concave portion (6) of the tank portion (5).

The resin (1) filled in the resin filling space (7) of the tank part (5)
0) plays a role of connecting and fixing the tank part (5) and the tube (1) as described above. The resin (10) is a liquid that is cured after being injected into the resin filling space (7). In addition, in this embodiment, the resin is injected into the openings at both ends of the tank (5).
This is done from the injection hole (12) provided in one of the end plates (11) that closes (5e). As the resin (10), any resin can be adopted as long as it exhibits sufficient bonding 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 structure in which one plate is continuously bent back at equal intervals in a curved shape, and it is preferable that 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 the flat tube portion (1a) of the tube.
Is designed to have a fin length approximately equivalent to the length of. Then, as shown in FIG. 4, heat exchange in which the ends of the fins (2) are matched with the ends of the flat tube portion (1a) and the direction of the 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. With the fins (2) attached, both ends of the heat exchange section (3), that is, the flat tube section of the tube (1)
(1a) A fin non-existing portion (P) is formed between the front end and the rear end of the circular pipe portion (1c) as shown in FIG. Thus, in this embodiment, the non-existing portion (P) is covered from both sides by the convex portions (5c) and (5c) formed at both ends of the retreat wall (1b) of the tank portion (5). Becomes 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 almost no 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 tube (1) and tank part (5)
By concealing the joint portion with and, the appearance becomes 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 the narrow intermediate piece (4a) continuously bent at right angles. ), And the bent pieces (4c) and (4c) that are continuously bent to the side piece (4b) and are bent at a right angle,
Cross section with specified length Formed into a shape. And, at both ends in the length direction of the intermediate piece (4a), a protruding insertion piece (4d) continuous with the intermediate piece (4d)
(4d) is formed, and one circular retaining hole (4e) is formed in this insertion piece. This side piece (4) is also made of aluminum. And such a side piece
(4) is a state in which the intermediate piece (4a) is located inside, that is, the heat exchange section (3) side, and the insertion piece (4d) is the entry wall of the tank section (5).
Insert the tube (1) into the corresponding insertion hole (14) provided in (5b).
Like the above, it is joined to the tank part (5) by the resin (10). Here, the retaining hole (4e) is a resin (1
This is to cause the side piece (4) to be prevented from coming off by the entry of (0). The number of retaining holes (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, reference numeral (15) denotes a mounting boss for the temperature detecting sensor for the heat exchange medium, which is provided by secondarily processing the post-extrusion tank portion (5). 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 the production of the radiator as described above, first, the tank portion (5) is formed with a hollow extruded material having a predetermined length, and then the sensor mounting boss (15) is formed on the tank portion (5) by the secondary processing. The separately manufactured end plate (11), heat exchange medium inflow and outflow pipes (16) and (17), filler neck (18), and bracket (19) are joined to corresponding parts by brazing. After that, the tank part (5) and the tube (1) are connected by the following procedure. Insert the suntane tube (1) into each tank
The insertion wall (5) and the partition wall (5d) of (5) are inserted and arranged in the insertion holes (9), and the side pieces (4) are oriented in a predetermined direction, and both end insertion pieces (4d) are also inserted holes. Insert into (14) to form a framework and then between the adjacent tubes (1) (1) and between the outermost tube and the side piece (4) a fin height slightly higher than the spacing between the tubes. Corrugated Fins (2)
Is installed in a predetermined direction to make the radiator temporarily assembled. By adopting such an assembly method, the tube
The (1), the fins (2), the tank part (5), and the side piece (4) are firmly fixed, and the jigs, tightening bands, etc., which have been required in the past, are not required. Then, after that, the tube (1) and the fin (2) are joined and fixed by a reactive soldering method or the like. As another method, regardless of such an assembly method, tubes (1) and fins (2) are alternately arranged and side pieces (4) are arranged on both sides and set in advance by brazing and then the tank It may be inserted in the section (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, the heat at the time of joining is used to fill the resin without any gaps, and if necessary, further heating is performed 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).

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 part (105) constitutes four sides of a substantially rectangular cross section, and
A partition wall (105d) having a U-shaped cross section is integrally provided on the inner surface of the outer wall on the (101) side to form a resin filling space (107). Moreover, the side piece (104) is formed to have a U-shaped cross section, and an ear piece (25a) having a nut fixing hole (25) for mounting a shroud at a predetermined position of the side piece.
Is provided. In addition, the circular pipe part (101
c) The tip is projected into the heat exchange medium storage space (108) of the tank part (105), and a spiral continuous groove (21) is engraved on the peripheral surface of the circular pipe part (101c). . The groove (21) is for preventing the tube (101) from coming off by biting the resin (110) injected into the resin filling space (107). In addition to the above structure, as shown in FIG. 9, as the drop-out preventing structure, the groove (22) may be formed in an independent ring shape instead of the continuous spiral shape. Further, instead of the groove, as shown in FIG.
The depression (23) may be formed on the peripheral surface of (101c).
In addition, in this embodiment, the portion corresponding to the convex portion (5c) of the tank portion (5) in the first embodiment described above does not exist, but 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. 11 shows still another embodiment of the present invention. In this embodiment, two vertical partition walls (205d ') (205) that partition the tank section (205) in the insertion direction of the tube (201).
d ') is separated, and 2 in the thickness direction of the tank.
Since the horizontal partition walls (205d ″) (205d ″) are provided, the resin filling space (207) is divided into two chambers in the tube insertion direction at the middle portion in the thickness direction of the tank portion (205). ing. The resin (210) is injected from the injection hole (24) provided in the wall surface of the tank portion (205) and the horizontal partition wall (205d ″) facing the wall surface of the tank portion (205). It is a convex part that covers the non-existing portions of the fins at both ends of the exchange part, and is formed in an L-shaped cross-section projecting from the outer wall of the tank part (205) so that the bent parts face each other. Concerning the structure of the parts, it is advantageous to adopt the structure shown in the first embodiment in that a large heat exchange medium storage space can be secured.

Embodiment 4 This embodiment is shown in FIG. 12 to FIG. 14, and the present invention is applied to a car cooler condenser.

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 large number of them connected in parallel between both ends and connected to the tank part. Tube (30
1) and a pair of left and right outermost side pieces (304) (304) as main members.

Each of the tank portions (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 at the center of the internal cross section.
As a result, the interior is filled with resin space (307) and the refrigerant passage (308).
It is divided into and. Moreover, both ends of the upper tank part (305) are closed by the lid pieces (300) (300), while the lower tank part (3
05 ′) is the inlet (317) and the outlet of the heat exchange medium at both ends
(318) is provided, and the refrigerant passage thereof is the partition wall.
A vertical partition (305d) passed between the center of (305d) and the inner surface of the peripheral wall.
It is divided into two front and rear passage parts (308a) (308b) by e). Then, one end on the inlet side of the passage portion (308b) on the rear side is closed by an insertion shield plate (304a) (FIG. 14) formed by an extension portion of the side piece (304), and is introduced from the inlet (317). The heat exchange medium 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. It is designed to be opened only in the passage portion (308b) of the.

The tube (301) is also made of a flat hollow extruded material made of an aluminum material, and both ends thereof are the outer wall and the partition wall in the tank portions (305) (305 ') according to the first embodiment.
(305d) is inserted into the notch (309) that is formed by penetrating the (305d), and the end face of the notch is opened to face the refrigerant passage (308), and the resin-filled spaces (307) (307) In both cases, the resin (310) is injected and filled so that the tank (30
5) It is firmly joined and fixed to (305 '). Reference numeral (323) shown in FIG. 13 and FIG. 14 is a recessed portion formed on the end portion of the tube (301) for retaining.

The refrigerant passage (321) in the tube (301) is divided into two front and rear passage portions (321a) (321b) by a partition wall (301a) also provided at the center portion in the width direction. And that partition
The lower end of (301a) is the vertical partition (305 ') of the lower tank (305').
By closely contacting with e), both, i.e. the tank part
The front passage and the rear passage of the tube (301) and the tube (301) are communicated with each other. Therefore, the heat exchange medium circuit of this heat exchanger is
(305 ′) from the front passage portion (308a) to the front passage portion (321a) of the tube (301) and then the inside of the upper tank portion (305), and then the passage portion at the rear side of the tube (301). (321b) passes through the rear passage portion (308b) of the lower tank portion (305 ') to reach the outlet (318).

Heat dissipation fin (3) between adjacent tubes (301) (301)
02) is formed as a cut-and-raised fin by thinly cutting and 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) (10) (205) (305) (30
5 ') shows the one made of aluminum hollow extrusion, but it is not limited to aluminum. 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 a tube by an expansion method.

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. 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, 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.

Further, since the tank part is made of extruded material, it can be manufactured to have a high pressure resistance and strength, and the connection between the tank part and the tube can be firmly joined by the resin filled in the resin filling space. Therefore, as for the condenser for car cooler and the like which was conventionally provided only with the serpentine type due to the problem of pressure resistance, the application of the present invention makes it possible to manufacture and provide the one having the structure shown in the embodiment, and the heat exchange. This will greatly expand the selection range of the shape and structure of the container.

[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. FIG. 6 is a sectional view taken along line VI-VI in FIG. 1, and FIGS.
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, FIG. 9 is a vertical view showing a modified example of the drop-out prevention structure provided at the end of the tube, and FIG. 10 is a vertical cross-sectional view showing yet another modified example of the drop-out prevention structure. 11th
The drawing shows the third embodiment of the present invention, and a sectional view of the essential parts showing the connection between the tank and the tube of the radiator, and FIGS. 12 to 14 show the fourth embodiment of the present invention. The present invention is applied to a condenser for car coolers. Fig. 12 is a perspective view of the whole appearance showing a part in a cut state, Fig. 13 is a side sectional view, and Fig. 14 is a tank part and a tube. FIG. 15 and FIG. 16 are exploded perspective views with a side piece, and FIG. 15 and FIG. 16 show a main part of a conventional heat exchanger, and FIG. 15 is a cross-sectional perspective view showing an exploded state before connection between a tank part and a tube. FIG. 16 is a sectional perspective view showing a state after connection. (1) (101) (201) (301) …… tube, (5) (105) (205) (305)
(305 ′) …… Tank part, (5d) (105d) (205d ′) (205d ″) (30
5d) …… 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, and an outer wall and a partition of the tank portion. The end portion of the tube is inserted in a state of penetrating a wall and traversing the resin filling space, and the tank portion and the tube are joined and fixed by injecting and filling a resin into the filling space. Heat exchanger.