JPH0740864Y2 - Heat exchanger - Google Patents

Description

TECHNICAL FIELD The present invention relates to a heat exchanger used for a condenser of an automobile or a home air conditioner, and more particularly to a so-called multi-flow type heat exchanger.

BACKGROUND ART Conventionally, for example, as a heat exchanger used in a car air conditioner condenser, a porous extruded flat tube called a harmonica tube is bent in a meandering shape, and fins are arranged between parallel portions to form a core. A so-called serpentine type heat exchanger configured was used.

However, in such a serpentine type heat exchanger, since the heat exchange medium passage is formed by one flat extruded tube, a large passage area cannot be secured, and the extruded tube is bent in a meandering shape. Since the radius of curvature of the bent portion cannot be reduced by more than a certain value, the tube pitch cannot be reduced, which reduces the number of fins interposed between the parallel portions of the tube, resulting in poor fin efficiency. There was a limit to the improvement.

Therefore, as a heat exchanger to replace the serpentine type, a heat exchanger in which both ends of a large number of flat tubes arranged in parallel are connected to a pair of hollow headers and fins are interposed between adjacent tubes is proposed. Has been done. According to this heat exchanger, since the tube pitch can be freely selected, a large refrigerant passage cross-sectional area can be secured, and the number of fins interposed between the tubes can be increased, resulting in a small size and excellent heat exchange efficiency. You can do it.

By the way, in this type of heat exchanger, in order to circulate the heat exchange medium in a meandering manner like the serpentine type, one or both of the headers are divided into a plurality of compartments by a partition plate, and thus, by a tube. In some cases, the constituted heat exchange medium passage is formed as a meandering passage.

As such a partition plate mounting structure, the header is composed of multiple short tubular header units, these header units are combined in the length direction with a partition plate in the middle, and brazed and fixed. Has been adopted. However, in such a structure, there is a risk that the number of parts will increase and the cost will increase, or that the header unit and the partition plate will be misaligned during brazing, so that the brazing work is troublesome and the productivity is poor. It had such drawbacks.

In order to solve such a problem, the applicant of the present application, as shown in FIG.
While forming a notch portion (52) in the circumferential direction over 1) in 1), as a partition plate (53), a small diameter portion (54) having an outer peripheral shape that fits the inner peripheral surface of the header (51) and a peripheral end. The part (55) having a large diameter part (56) adapted to the cut part is used, and the partition plate (53) is cut from the small diameter part (54) side to the cut part (5).
By inserting into the header (51) via 2),
The outer peripheral surface of the small diameter portion (54) is brought into contact with the inner peripheral surface of the header (51), and the peripheral end portion (55) of the large diameter portion (56) is cut into the cut portion (5
2) Place it in the fitted state and partition plate (53)
A heat exchanger in which the header and the header (51) are integrated by brazing is proposed (see Japanese Utility Model Laid-Open No. 63-49193). This is advantageous because it is possible to reduce the number of parts, simplify the assembly and joining work, improve the productivity, and reduce the cost. In addition, (62) is a tube and (63) is a corrugated fin.

However, in this heat exchanger, the relationship between the gap length between the upper and lower surfaces (52a) (52b) of the notch (52) formed in the header (51) and the thickness of the partition plate (53) may be slightly different in terms of processing. There may be an error, so the notch (52)
If the gap length of is slightly larger than the set dimension, the partition plate (53) is inserted into the header (51) through the notch (52), and the partition plate (53) is inserted.
The movement in the pull-out direction of the was not strictly regulated, and the partition plate (53) might unintentionally shift its position or fall out of the header (51) before brazing.

Therefore, the applicant, as a heat exchanger to solve this problem, as shown in the figure in the subsequent application,
A small protrusion (57) is provided on one surface of the partition plate (53), and when the partition plate (53) is fitted in the header (51), the small protrusion (57) is attached to the upper surface (52a) of the cut portion (52). It is assumed that it is positioned adjacent to the inner edge surface (52c) adjacent to,
As a result, when the partition plate (53) tries to move in the pulling-out direction, the small projection (57) engages with the inner edge surface (52c), and the pulling-out is prevented. We proposed an exchanger (Japanese Utility Model Publication No. 64-31368).

Problems to be Solved by the Invention However, the heat exchanger employing the small protrusions (57) as described above still has the following problems.

That is, in the process of fitting the partition plate (53) into the header (51) through the cutout portion (52), the small protrusions (57) form the cutout portion (5).
The upper surface (52a) of 2) may be hit strongly, which may form a deep groove in the upper surface (52a). Therefore, when the partition plate (53) tries to move in the pull-out direction, the small protrusion (57 ) Moves in the groove without engaging with the inner edge surface (52c) of the notch (52), which may cause the partition plate (53) to be displaced or fall out.
However, the fixed state is not always stable.

This invention solves the conventional problems as described above, and the partition plate fitted and arranged in the header through the notch causes a positional deviation in a state before being joined and integrated with the header, or It is an object of the present invention to provide a heat exchanger that can more surely prevent falling off from the header than in the conventional case, and can appropriately maintain the temporary assembled state of the heat exchanger components.

Means for Solving the Problems In the above object, according to the present invention, a large number of flat tubes arranged in parallel are connected at their both ends to a pair of hollow headers, and fins are provided between adjacent tubes. A heat exchanger in which at least one of the headers is partitioned by a partition plate so that the heat exchange medium flows in a meandering manner in a flow path that is interposed and formed by a tube group, and the partition plate has a periphery of the header. Is inserted into the header through a slit-shaped notch provided in the direction, and fixed by a plastically deformed portion formed by striking the outer surface of the side edge of the notch, and integrally joined to the header. The gist is a heat exchanger characterized by being formed.

Action In the above heat exchanger, the partition plate is fixed to the header by the plastically deformable portion formed on the header in a state of being fitted and arranged in the header, so that both are joined and integrated. Even if the partition plate tries to be displaced or moved in the meantime, it is surely prevented by the action of the plastically deformed portion.

Embodiment Next, the structure of the present invention will be described based on an embodiment applied to a condenser made of aluminum or its alloy for car air conditioners.

In the condenser shown in FIGS. 4 and 5, both ends of a plurality of tubes (1) arranged horizontally in the vertical direction are connected to the side surfaces of a pair of left and right cylindrical headers (3) (4). The corrugated fins (2) are interposed between the adjacent tubes (1) and (1), and the inlet pipe (7) is inside the upper end of the left header (3) and the lower end of the right header (4). An outlet pipe (8) is attached to the outside of the part, and the inside of the left header (3) is divided into four upper and lower chambers by a partition plate (11) and the inside of the right header (4) is divided into four upper and lower chambers by a partition plate (12). It is said to have been done. In this condenser, the heat exchange medium flowing from the inlet pipe (7) into the left header (3) is
The tubes (1) flow in a meandering manner and flow out from the outlet tube (8). In the meantime, this heat exchange medium is connected to the tube (1).
The heat is exchanged with the air flowing through the air flow gap including the corrugated fins (2) formed between (1) and condensed.

The tube (1) is composed of a flat aluminum extrusion mold material. Then, as shown in FIG. 1, the both ends of the tube (1) are subjected to a tapping process to form an ellipse-shaped small diameter portion (1a) and a stepped stopper (1b). The ends of the tubes (1) are inserted into the tube insertion holes (5) formed on the side surface of the header (3) at predetermined intervals so as to be positioned. The tube (1) is brazed to the headers (3) and (4) in this fitting arrangement. In addition, the stopper (1b) is the header (3)
It is formed in an arc shape along the outer peripheral surface of (4) and is formed in a downward slope toward the end portion side of the tube (1), and the end portion of the tube (1) is attached to the header (3) ( 4)
The brazing filler metal can easily enter the gap between the two when it is inserted and placed into the unit and integrated by brazing to achieve reliable brazing. As the above-mentioned tube (1), a porous type such as a so-called harmonica tube may be used.

Although the headers (3) and (4) are circular tubes having a cross section formed by an electric resistance welded tube made of an aluminum brazing sheet in which a brazing material is coated on one or both sides of a core material, aluminum is used instead of the electric resistance welded tube. An extruded mold material may be used. Note that lid pieces (9) and (9) are attached to the upper and lower ends of the left header (3), and lid pieces (10) and (10) are attached to the upper and lower ends of the right header (4), respectively.

The corrugated fin (2) is made of an aluminum brazing sheet in which a brazing material is coated on one side or both sides of the core material, has the same width as the tube (1), and is integrally joined to the tube by brazing. There is. The corrugated fins (2) are preferably cut and raised louvers.

Note that (13) and (14) are outermost corrugated fins (2).
The upper and lower side plates are arranged outside of.

The fixing structure of the partition plates (11) (12) is as follows. That is, as shown in FIG. 1, in the header (3), at a position where the partition plate (11) is to be attached, a slit shape having a gap approximately equal to the thickness of the partition plate (11) in the circumferential direction over substantially half the circumference thereof. The notch (15) is formed.
On the other hand, the partition plate (11) is formed in a small diameter part (11a) having an outer diameter equal to the inner diameter of the header (3), and the remaining half circumference is equal to the outer diameter of the header (3). Is formed in the enlarged large diameter portion (11b) at the peripheral edge. As shown in FIG. 2 and FIG. 3 (a), the partition plate (11) has an outer peripheral surface of the small diameter portion (11a) abutting on the inner peripheral surface of the header (3) and has a diameter of The peripheral end portion (11c) of the large portion (11b) is fitted into the header (3) through the cutout portion (11) in a state of being fitted to the cutout portion (15).
Then, in that state, as shown in FIG. 3B, by striking the notch (15) upper edge outer surface and the lower edge outer surface from the diagonal direction toward the partition plate (11), Plastic deformation portions (20) (20) that are in pressure contact are formed on both side surfaces of the peripheral end of the large diameter portion (11b) of the partition plate (11), and the partition plate (20) (20) is formed by these plastic deformation portions (20) (20). 11) Fix.
As a result, it is possible to reliably prevent the subsequent displacement or dropout of the partition plate (11). In this state, the partition plate (11) is joined and integrated with the header (3) by brazing.

As the fixing structure of the partition plate (11) by the plastically deformable portion, various modified examples as described below can be adopted in addition to the above.

In the modified example shown in FIG. 6, a partition plate (11) having a large diameter portion (11b) whose diameter is slightly smaller than the outer diameter of the header (3) is used. Insert it into the header (3) through the, and as shown in (a) of the same figure, arrange the peripheral end surface of the large-diameter portion (11b) so as to retract into the notch (15), In that state, by striking the outer surface of the upper edge portion and the outer surface of the lower edge portion of the notch (15), as shown in Fig. 11 (b), the circumference of the large diameter portion (11b) of the partition plate (11). The plastically deformed part (2
1) (21) is formed, the partition plate (11) is fixed by the plastically deformed portions (21) (21), and both are joined and integrated by brazing.

In the modified example shown in FIG. 7, a partition plate (11) having a large-diameter portion (11b) formed with a notch (22) at the center of the peripheral end as shown in FIG. , This is fitted and arranged in the header (3) through the notch (15), and in that state, the notch (15) corresponding to the position of the notch (22) as shown in FIG. The plastic deformation portions (23) (23) are formed by projecting into the notch (22) by striking the outer surfaces of the upper edge portion and the lower edge portion in an oblique direction to form the plastic deformation portions (23) (23). The partition plate (11) is fixed by, and both are joined and integrated by brazing.

The partition plate fixing structure shown in Fig. 11 is
As shown in FIG. 3, a recess (30) of a predetermined length along the circumferential direction is formed on the inner surface of the header (3) facing the cut (15) through the inside of the header (3), while the partition plate is formed. The partition plate (11) is used as (11) by integrally forming a bulged portion (31) adapted to the recess (30) at the peripheral end of the small diameter portion (11a). It is inserted into the header (3) through the notch (15), and the bulge (31) is fitted into the recess (30) as shown in FIG. The partition plate (11) is fixed by striking the outer surface of the upper edge portion and the outer surface of the lower edge portion of 15) to form plastically deformed portions (20) (20). In this modification, not only is the partition plate (11) fixedly secured, but a gap is created between the small diameter portion (11a) and the inner surface of the header (3) due to dimensional errors and the like. It becomes possible to effectively avoid such a defect.

The partition plate fixing structure shown in Fig. 12 is
As shown in FIG. 3, the notch (15) is formed over substantially the half circumference of the header (3), and a circumferential recess (33) is formed over the half circumference on the inner surface of the header (3) so as to be continuous therewith. Also, as the partition plate (11), a disk having the same diameter as the outer diameter of the header (3) is used.
Through the notch (15) into the header (3),
The partition plate (11) is fixed by fitting it into the recess (33) and forming the plastically deformed portions (20) (20) as shown in FIG.

Effect of the Invention According to the above, in the multi-flow type heat exchanger of the present invention, a large number of flat tubes arranged in parallel are connected at their both ends to a pair of hollow headers and are adjacent to each other. A heat exchanger in which fins are interposed between the tubes, and at least one of the headers is partitioned by a partition plate so that the heat exchange medium flows in a meandering manner in a flow passage formed by the tube group. Is inserted and arranged in the header through a slit-shaped notch provided in the circumferential direction of the header, and fixed by a plastically deformable portion formed by striking the outer surface of the side edge of the notch, and It is integrated with the header. Therefore, the header can be manufactured integrally, and the number of parts can be reduced as compared with the conventional case where a short header unit is joined in the middle with a partition plate interposed. Since the partition plate is fixed by the plastically deformed portion formed inside the header in the fitted arrangement state, it is sure that the partition plate will be displaced or slipped out in that state. Therefore, the heat exchanger components can be properly maintained in the temporarily assembled state. Moreover, the plastically deformable portion can be easily formed by fitting the partition plate in the cut portion and then tapping the side edge portion of the cut portion from the outer surface, so that the temporary fixing of the partition plate to the header is extremely difficult. It can be done easily.

[Brief description of drawings]

1 to 5 show an embodiment of the heat exchanger of the present invention. FIG. 1 is a perspective view showing a header, a tube and a partition plate in a separated state, and FIG. 2 is a partition plate in the header. Cross-sectional view of the header showing the arrangement of the, Figure 3 (a)
Is a vertical cross-sectional view showing the arrangement state of the partition plate in the header, FIG. 4B is a vertical cross-sectional view showing the state where the partition plate is fixed by the plastic deformation portion, and FIG. 4 is an overall front view of the heat exchanger, FIG. 5 is a plan view of the same. 6 to 9 show modified examples of the partition plate fixing structure. FIG. 6 (a) is a longitudinal sectional view showing the arrangement of the partition plates in the header, and FIG. 6 (b) is the partition. FIG. 7 (a) is a perspective view of the partition plate, and FIG. 7 (b) is a perspective view showing the state where the partition plate is fixed by the plastically deformable portion. FIG. 8 (a) is a vertical cross-sectional view showing the partition plate and the header in a separated state, FIG. 8 (b) is a vertical cross-sectional view showing the fitting arrangement state of the partition plate, and FIG. 9 (a) is the partition plate. A vertical cross-sectional view showing the header in a separated state, and the same figure (b) is a vertical cross-sectional view showing a fitting arrangement state of the partition plate. Figure 10 shows a conventional heat exchanger with a header,
It is a perspective view shown in the state where a tube and a partition board were separated. (1) ... Flat tube, (2) ... Fin, (3) (4)
... Header, (11) (12) ... Partition plate, (15) ... Incision, (20) (21) (23) ... Plastic deformation part.

Claims (1)

[Scope of utility model registration request] 1. A plurality of flat tubes arranged in parallel are connected at their both ends to a pair of hollow headers respectively, and fins are interposed between adjacent tubes.
A heat exchanger in which at least one header is partitioned by a partition plate so that the heat exchange medium circulates in a meandering manner in a flow path formed by a tube group, and the partition plate is provided in the circumferential direction of the header. It is fitted and arranged in the header through the slit-shaped notch formed, and is fixed by the plastically deformed portion formed by striking the outer surface of the side edge of the notch, and is integrally joined to the header. A heat exchanger characterized by the above.