JP2000205776A - Flat tube heat exchange and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure strong fixation at a joint and provide a small width size heat exchanger flat tube. SOLUTION: The height of a bead 13 opposing to a joint portion between opposite side edge portions 12A, 12 of a plate 12 is previously set lower by a size smaller than the thickness size t of the plate than the height H1 of the bead at a position not opposing to the joint portion. Accordingly, when a plate 13 is bent, a joint portion between the side edge portions 12A, 12B can be placed on the top of the bead 13 at the opposing position and pressurized for secure joint. Further, with the pressurization a plate 12 inside surface can be securely joined also with the top portion of the bead 14 located at the position not opposing to the joint portion. Thus, junction of the joint portion can be secured for secure fixing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat tube for a heat exchanger such as a condenser, an evaporator, a heater, and a radiator used in an automobile refrigeration cycle, and a method for manufacturing the same. The present invention relates to a flat tube for a heat exchanger having a plurality of protrusions.

[0002]

2. Description of the Related Art Conventionally, as a flat tube for a heat exchanger, as shown in FIGS. 8 and 9, two plates 1 and 2 each having a plurality of beads 1A and 2A protruding on one side are formed. Some beads 1A, 2A are assembled so that the tops thereof come into contact with each other, and the contacted portions are brazed.

Further, as another flat tube for a heat exchanger, as shown in FIG. 10, one plate 4 is bent into a flat cylindrical shape to fix both side edges 4A, 4A to each other, and to fill the internal space. Some have the inner fin 5 inserted.

[0004]

However, in the former flat tube for a heat exchanger, when the joints 3 projecting from both sides in the width direction press the plates 1 and 2 together, FIG.
As shown in (1), there is a problem that brazing failure occurs due to deformation. In this flat tube for heat exchanger,
Since the joints 3 protrude on both sides in the width direction, the width becomes long, and the diameter of a header pipe (not shown) for mounting the flat tube for a heat exchanger becomes large.

Further, in the latter flat tube for a heat exchanger, there is a problem in that the displacement at the time of insertion of the inner fins 5 causes insufficient pressurization of the joint portion of the plate 4 to easily cause poor brazing. .

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a flat tube for a heat exchanger having a small width and capable of firmly fixing the joint portion.

[0007]

According to the first aspect of the present invention,
The plate is bent into a flat cylindrical shape so that both sides of the plate are joined to each other so as to have a flow gap for the heat exchange medium therein, and the plate protrudes inward from one or both of the opposing flat surfaces. A plurality of beads are formed, and the top of the bead is a flat tube for a heat exchanger joined to the opposed flat surface side, wherein the inner side edges of both sides of the plate face each other. Along with being joined to the top surface of the top of the bead located in the region, the height of the bead facing the side edge is set lower than the bead in the region not facing the side edge. I do.

According to a second aspect of the present invention, there is provided the flat tube for a heat exchanger according to the first aspect, wherein the height of the bead facing the side edge is in a region not facing the side edge. It is characterized in that it is set lower by the thickness dimension of the plate.

According to a third aspect of the present invention, there is provided the flat tube for a heat exchanger according to the first or second aspect, wherein the beads are arranged in a plurality of rows along a longitudinal direction of the flat surface. Features.

According to a fourth aspect of the present invention, there is provided the flat tube for a heat exchanger according to the third aspect, wherein a portion where the both side edges of the plate are joined faces a plurality of rows of beads. It is characterized by.

According to a fifth aspect of the present invention, there is provided a method of manufacturing a flat tube for a heat exchanger, wherein a plurality of beads projecting toward one surface of the plate are formed, and the plate is formed so that the bead is located inside. Is bent into a flat cylindrical shape,
After joining both side edges of the plate, and after making the joining portion between the two side edges abut against the top of the bead, the joining portion between the two side edges, and the joining portion The contact portion of the bead is fixed.

According to a sixth aspect of the present invention, there is provided the method for manufacturing a flat tube for a heat exchanger according to the fifth aspect, wherein the joining portion is located within one of the opposed flat surfaces. It is characterized by being formed.

According to a seventh aspect of the present invention, there is provided the method for manufacturing a flat tube for a heat exchanger according to the fifth or sixth aspect, wherein one side edge of the joint portion of the plate is provided with one side edge of the plate. A step corresponding to the thickness dimension is formed, the bending process is performed so that the other side edge of the joining portion is accommodated in the step, and the outer peripheral surface including the joining portion is formed flush, The height of the bead facing the joining portion is set to be lower than the height of the bead at a position not facing the joining portion by a dimension smaller than the thickness dimension of the plate in advance.

[0014]

According to the first aspect of the present invention, since the height of the bead facing the side edge of the plate is set lower than the height of the bead in the area facing the side edge, both sides of the plate are set. It is possible to suppress the joint portion of the edge portion from protruding outward. Further, by positioning the joint portion of the plate on the flat surface facing the bead, it is possible to prevent the width dimension of the flat tube for the heat exchanger from being unnecessarily lengthened.

According to the second aspect of the present invention, in addition to the effect of the first aspect, the outer side surfaces of the joints between the side edges of the plate can be flush with each other, and the joints are heat-exchanged. It can be prevented from protruding to the outer surface of the dexterous flat tube. In addition, it is possible to secure bonding between the top of the bead that does not face the bonding portion and the side of the uneven plane that faces the bead.

According to the third aspect of the present invention, in addition to the effects of the first and second aspects of the present invention, a joining portion between both side edge portions of the plate is formed along the longitudinal direction of the offset plane. Since it can be joined to the tops of the rows of beads, it is possible to fix the joining portion in the longitudinal direction, and to maintain the joining strength.

According to the fourth aspect of the invention, in addition to the effect of the third aspect of the present invention, since the joining portions between the side edges of the plate are joined to a plurality of rows of beads, the fixing strength is further improved. Can be done.

According to the fifth aspect of the present invention, it is possible to jointly fix the joint between the both side edges of the plate and the joint and the bead top. For this reason, by holding down the joining portion between the both side edges of the plate, it is possible to hold down the joining portion and the top of the bead, so that manufacturing can be easily performed.

According to the sixth aspect of the present invention, in addition to the effect of the fifth aspect of the present invention, the width of the flat tube for a heat exchanger can be improved by locating the joint between the side edges of the plate in a flat plane. An increase in size can be suppressed. Therefore, it is possible to suppress an increase in the diameter of a pipe or the like to which the flat tube for a heat exchanger is attached.

According to a seventh aspect of the present invention, in addition to the effects of the fifth or sixth aspect, the thickness of the plate is added to one side edge of the joint between the two side edges of the plate. Since the step is formed, it is possible to prevent the joining portion from protruding outward when joining. Also, since the height of the bead facing the joining portion is set to be smaller than the height of the bead at the position not facing the joining portion in advance by a dimension smaller than the thickness of the plate, when bending the plate, The joining portion between the edge portions can be placed on the top of the bead at the opposing position and pressed, and the joining can be ensured by this pressing. Further, by this pressurization, the inner surface of the plate can be securely joined also to the top of the bead which does not face the joining portion. In this way,
It is possible to secure the joining of the joining portion, and it is possible to perform secure fixing.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of a flat tube for a heat exchanger according to the present invention will be described below based on embodiments shown in the drawings.

1 to 6 show an embodiment of the present invention. FIG. 1 is a perspective view of a main part of a flat tube 11 for a heat exchanger of a condenser employed in an automotive refrigeration cycle as a heat exchanger.

The flat tube 11 for a heat exchanger is shown in FIG.
As shown in FIG. 1, one rectangular plate 12 is formed by bending at two places so that the side edges 12A and 12B overlap on an uneven plane, and a flow path of a refrigerant as a heat exchange medium is formed inside. Have been. The plate joining portion where these side edges 12A and 12B overlap is joined to the top surface of a bead 13 protruding from the facing surface (lower surface) of the plate 12. The plate joining portion and the bead joining portion between the inner side edge 12B of the plate joining portion and the top surface of the bead 13 are fixed by brazing.

The beads 13 intermittently protrude along the longitudinal direction of the flat tube 11 for a heat exchanger (the direction parallel to the side edges 12A and 12B) to form a row.
The plate joining portion is set so as to be located above the row of the beads 13. Plate 1
On the lower surface of 2, a bead 14 having a length higher than the bead 13 is formed intermittently in the longitudinal direction in a region not opposed to the plate joining portion. In the present embodiment, there are two rows of beads 14 intermittently arranged in the longitudinal direction. The bead 13 and the bead 14 are formed by dimple processing. In addition, these beads 14
Are fixed to the surface of the plate 12 facing and joined by brazing.

As shown in FIG. 2, the height H1 of the bead 13 in the flat tube 11 for a heat exchanger of the present embodiment.
Is higher than the height H2 of the bead 14 by the thickness t of the plate 12. Further, the thickness t of the plate 12 is set downward on the side edge portion 12B of the plate joining portion.
An outer surface of the plate joining portion is flush with the side edge portion 12A because the side edge portion 12A fits in the step. These beads 13 and 14 have a circular planar shape and a trapezoidal cross-sectional shape, complicate the refrigerant flow path and lengthen the extension path, and increase the surface area of the flat tube 11 for a heat exchanger. The rigidity of the flat tube 11 for a heat exchanger is increased. Although not shown, an inlet for introducing the refrigerant is formed at one end in the longitudinal direction of the flat tube 11 for a heat exchanger, and an outlet for discharging the refrigerant is formed at the other end. .

Next, a method of manufacturing the flat tube 11 for a heat exchanger according to the present embodiment will be described with reference to FIGS. In the present embodiment, bending and brazing are performed using the plate 12 that has been processed as shown in FIG. As shown in the figure, the plate 12 used in the present embodiment is a plate 1 on both sides of a region where beads 13 and 14 are formed in a longitudinal direction at a predetermined width at an intermediate portion in the width direction.
The two parts are bent. The side edge 12B of the plate 12 is formed with a step in which the side edge 12A is overlapped and fits. The beads 13 are formed at the center in the width direction so as to intermittently form one row along the longitudinal direction. Beads 14 are arranged in a predetermined arrangement on both sides of the row in the width direction. The number of beads 13 and the number of beads 14 in the row are determined by the flat tubes 11 for the heat exchanger.
Can be changed as appropriate according to the size of.

Next, the portions of the plates 12 on both sides are bent so that the side edges 12B are placed on the side edges 12B as shown in FIG.
A is overlapped. FIG. 4 is an exploded perspective view showing a state where the flat tube 11 for a heat exchanger is cut and disassembled on both sides so that the lower inner surface of the plate 12 can be seen.
In FIG. 4, a region indicated by a broken line indicates a region where the plate joint portion is located, and indicates that the region is located above the bead 13.

Here, the height dimensions of the beads 13 and beads 14 formed in advance on the plate 12 will be described. In this embodiment, as shown in FIG. 5, the height H2 'of the bead 13 is larger than the height H1 of the bead 14,
It is set in advance to be shorter by a dimension shorter than the thickness dimension t of No. 2. In the state shown in FIG. 5, the plate joining portion (the portion where the side edges 12A and 12B overlap) is the bead 1
3 shows a state in contact with the top surface. At this time, the top surface of the bead 14 is separated from the inner surface of the plate 12 without joining.

Next, the plate joining portion is pressed against the top surface of the bead 13 with a predetermined pressure, so that the side edges 12A, 1
2B, and the joining between the side edge 12B and the top surface of the bead 13 are ensured. At this time, the height of the bead 13 is compressed to H2 by pressing. By pressing in this manner, the inner surface of the plate 12 is also joined to the top surface of the bead 14, as shown in FIG. Then, after such reliable bonding is performed, brazing is performed to perform fixing. Thus, the flat tube 11 for a heat exchanger of the present embodiment is completed.

In the present embodiment, by setting the heights of the beads 13 and the beads 14 in this manner, it is possible to secure the joining and to secure the fixing by brazing. . Further, by forming the beads 13 and 14 in such an arrangement, the refrigerant flowing between the beads 13 and 14 generates a turbulent flow, so that the heat exchange rate can be improved.

Although the embodiments have been described above, the present invention is not limited to these, and various changes accompanying the gist of the configuration are possible. For example, as shown in FIG. 7, the plate joining portion may be joined so as to span two rows of beads 13, and in this case, the pressing force applied for joining can be increased. In the above-described embodiment, the configuration is such that the beads protrude from one (lower side) of the deflected planes of the plate. However, the configuration may be such that the beads protrude from both deflected sides. Further, the present invention can be applied to flat tubes for heat exchangers such as evaporators, heaters, and radiators, in addition to condensers used in refrigeration cycles of automobiles.

[Brief description of the drawings]

FIG. 1 is a perspective view of a main part of an embodiment of a flat tube for a heat exchanger according to the present invention.

FIG. 2 is a sectional view of a main part of the flat tube for a heat exchanger according to the embodiment.

FIG. 3 is a perspective view of a main part of a plate constituting the flat tube for a heat exchanger of the embodiment.

FIG. 4 is an exploded perspective view of the flat tube for a heat exchanger of the embodiment.

FIG. 5 is an explanatory sectional view of a main part of a flat tube for a heat exchanger according to the embodiment.

FIG. 6 is an explanatory sectional view of a main part of a flat tube for a heat exchanger according to the embodiment.

FIG. 7 is a perspective view of a main part showing another embodiment of the flat tube for a heat exchanger according to the present invention.

FIG. 8 is an explanatory view showing a manufacturing process of a conventional flat tube for a heat exchanger.

FIG. 9 is a sectional view of a main part showing a problem of a conventional flat tube for a heat exchanger.

FIG. 10 is an exploded perspective view of another conventional flat tube for a heat exchanger.

[Explanation of symbols]

 11 Flat tube for heat exchanger 12 Plate 12A, 12B Side edge 13, 14 Bead

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hiroyuki Tamura 5-24-15 Minamidai, Nakano-ku, Tokyo Calsonic Co., Ltd. (72) Fuya Kaneko 5-24-15 Minamidai, Nakano-ku, Tokyo Calso Inside Nick Corporation (72) Inventor Yuichi Isawa Inside Calsonic Corporation 5-24-15 Minamidai, Nakano-ku, Tokyo

Claims (7)

[Claims] A plate (12) is bent into a flat cylindrical shape so as to have a heat exchange medium flow gap therein, and both side edges of the plate (12) are joined together, and the plates (12) are opposed to each other. A plurality of beads (13, 14) projecting inward from one or both of the planes are formed,
A flat tube for a heat exchanger in which the tops of the beads (13, 14) are joined to the opposed flat sides, wherein a side edge (12B) located inside of both side edges of the plate (12) is formed. The height of the bead (13), which is joined to the top surface of the bead (13) located in the facing region and faces the side edge portion, does not face the side edge portion (12B). A flat tube for a heat exchanger, wherein the flat tube is set lower than the bead (14). 2. The height (H2) of the bead (13) opposed to the side edge (12B) is equal to the height of the side edge (12B).
The flat tube for a heat exchanger according to claim 1, wherein a thickness (t) of the plate (12) is set lower than that of the bead (14) in a region not opposed to the flat tube. 3. The flat tube for a heat exchanger according to claim 1, wherein the beads (13, 14) form a plurality of rows along a longitudinal direction of the flat surface. 4. The plate according to claim 3, wherein the part of the plate on which the side edges are joined is opposed to a plurality of rows of beads. Flat tube for heat exchanger. 5. A plurality of beads (13, 14) projecting toward one surface of the plate (12), and the plate (1) is formed so that the beads (13, 14) are inside.
2) is bent into a flat cylindrical shape, and the plate (1) is bent.
After the two side edges (12A, 12B) of 2) are joined together, and the joined portions of the two side edges (12A, 12B) are brought into contact with each other so as to face the top of the bead (13), A method for manufacturing a flat tube for a heat exchanger, comprising: fixing a joint portion between both side edge portions (12A, 12B) and a contact portion between the joint portion and the bead (13). 6. The method for manufacturing a flat tube for a heat exchanger according to claim 5, wherein the joining portion is formed so as to be located in one of the opposed flat surfaces. 7. One side edge (12B) of the joint portion of the plate (12) is formed with a step corresponding to the thickness dimension (t) of the plate (12), and the other edge of the joint portion is formed. The side edge portion (12A) is bent so as to be accommodated in the step, the outer peripheral surface including the joint portion is formed flush, and the height of the bead (13) facing the joint portion is adjusted. The height (H2) is previously set to be lower than the height (H1) of the bead (14) at a position not facing the joining portion by a dimension smaller than the thickness (t) of the plate (12). The method for producing a flat tube for a heat exchanger according to claim 5 or 6, wherein: