JP3047130B2 - Heat exchanger - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger mainly used for a vehicle air conditioner.

[0002]

2. Description of the Related Art Conventionally, in this type of heat exchanger, the heat (heat exchange medium) is provided along a heat exchange medium passage of a tube element in order to improve a heat exchange rate by giving a turbulent action to a fluid (heat exchange medium). There is a known one in which a contact bead and a non-contact bead are provided to protrude inside the exchange medium passage (for example, see Japanese Patent Application Laid-Open No. 1-184399).

[0003]

Generally, in a heat exchanger such as a heater core, the passage area may be smaller than that of an evaporator, so that the width of the tube element may be narrow and the internal pressure is low. Except for heat exchangers for cold districts where performance is required, the beads mentioned in the above prior art are unnecessary.

However, when the thickness of the tube element is reduced to reduce the cost, in the tube element having no bead, there is no central partition in the folded passage portion which is the folded portion of the fluid. There is a disadvantage that the pressure resistance is insufficient. In order to solve this problem, for example, if staggered beads are provided in the folded passage portion as in the related art in order to improve the withstand voltage, a problem that the passage resistance of the folded passage portion having the highest passage resistance further increases. Would.

Accordingly, the present invention has been made in view of the above problems,
An object of the present invention is to provide a heat exchanger that improves the pressure resistance of the folded passage portion while minimizing an increase in the passage resistance of the folded passage portion of the heat exchange medium passage of the tube element.

[0006]

In order to achieve the above object, a heat exchanger according to the present invention is provided with a pair of tanks integrally or separately provided at one end side, and a substantially U-shaped tank communicating with the pair of tanks is provided. In a heat exchanger formed by stacking tube elements each having a U-shaped heat exchange medium passage formed with fins interposed therebetween in a multi-stage manner, the heat exchange medium passage of the tube element is a folded passage portion, and the heat exchange medium passage is center partition portion on a line connecting the corners of the tip and the tube element, a contact bead or non-contact bead protruding toward the internal heat exchange medium passage provided Rutotomoni, the heat exchange medium, except the portion that partitions
Contact or non-contact with the tube element that constitutes the passage
No touch bead is provided .

[0007]

Therefore, the contact bead or the non-contact bead provided on the line connecting the tip of the center partition, which is the widest section of the passage section, and the corner of the tube element is located at the widest place in the folded passage section, so that the passage resistance is minimized. In addition to the above, the beads increase the pressure resistance of the folded passage portion, thereby solving the above-mentioned problem.

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, the heat exchanger is constituted by alternately stacking a plurality of tube elements 1 and fins 2 in a plurality of stages.

The tube element 1 has a substantially rectangular shape as shown in FIG. 2, and is formed by joining two forming plates 3 and 3 shown in FIG.

The forming plate 3 is made of, for example, aluminum or an aluminum alloy, and is formed by pressing.
The bulging portions 5 and 6 for forming a tank portion having bulging portions are formed,
A ridge 7 extends from between the tank portion forming bulges 5 and 6 toward the other end, and the rim 7 is formed around the rim of the tank portion forming bulges 5 and 6. A substantially U-shaped heat-exchange-medium-passage-forming bulging portion 8 communicating therewith is bulged.

[0012] Lines A and B connecting the tip of a center partition 17 and the corner of the forming plate 3 which partition the heat exchange medium passage 18 described below constituted by the heat exchange medium passage forming bulging portion 8 are shown below. Projecting into the heat exchange medium passage 18,
A predetermined number of contact beads 10 that oppose each other are formed (see FIGS. 2 to 4).

Also, on the other end side of the molding plate 3,
A tube element abutting portion 12 for defining a distance between the tube elements is formed to protrude outward.

A tube element 1 is formed by joining the two forming plates 3 together at the center thereof, and a pair of tank portions 15 and 16 is formed at one end of the tube element 1 from opposing bulging portions 5 and 6 for forming tank portions. A central U-shaped heat exchange medium passage 18 is formed from the opposed heat exchange medium passage forming bulging portion 8 inside the center partition 17 from the opposed protrusion 7. Tank parts 15, 16
Communicate with each other through a heat exchange medium passage 18.

In the return passage portion 20 which is a return portion of the fluid in the heat exchange medium passage 18, opposing contact beads 10 come into contact with each other, and the contact beads 10 improve the pressure resistance of the return passage 20. It has become.

The tube elements 1 are stacked in a plurality of stages by adjoining a pair of tank portions 15 and 16 and tube element abutting portions 12 at both ends thereof, and are stacked in a plurality of stages. The fins 2 are arranged on both sides in the stacking direction.

In each of the laminated tube elements 1, the tank portions that are in contact with each other are connected to each other through the tank communication hole 4, and are connected to an inlet pipe (not shown) by the connected tank portion 15 on the front side in the figure. The connected inlet tank 21 has an outlet tank 22 connected to an outlet pipe (not shown) by the communicating tank portion 16 on the rear side in the figure. Note that the tank communication holes 4 are not formed in the forming plates 3a at both ends in the stacking direction.

In the heat exchanger configured as described above, the heat exchange medium flowing into the inlet tank 21 from the inlet pipe is:
It flows through the heat exchange medium passage 18 of each tube element 1, exchanges heat with the outside air during that time, is collected in the outlet tank 22, and is discharged from the outlet pipe (or follows the reverse route). is there. The heat exchanger may have a configuration in which the tank is provided separately.

However, as described above, the tube element 1 of the heat exchanger is inserted into the heat exchange medium passage 18 on a straight line connecting the end of the central partition 17 and the corner of the tube element 1, which is the widest section of the cross-sectional passage. Since the contact bead 10 protruding toward the opening is provided, the contact bead 10 provided at this position acts to increase the pressure resistance of the folded passage portion 20 while minimizing the passage resistance of the folded passage portion 20. As a result, the pressure resistance of the tube element 1 can be improved without lowering the heat exchange rate.

As shown in FIG. 5, when the contact bead 10a is formed in a shape along the flow of the fluid (heat exchange medium), the effect of the heat exchanger according to the first embodiment described above is obtained. Further, the passage resistance can be reduced.

Further, as shown in FIGS. 6 to 8, when the folded passage portion 20 is provided with the non-contact beads 30, 31 instead of the contact beads 10, the heat exchange according to the above-described first embodiment is achieved. In addition to the function and effect of the vessel, it is possible to further reduce the passage resistance.

[0022]

As described above, according to the present invention,
A contact bead or a non-contact bead is provided on the line connecting the tip of the center partition, which is the widest part of the cross-sectional passage, and the corner of the tube element. This has the effect of increasing the pressure.

[Brief description of the drawings]

FIG. 1 is a perspective view of a heat exchanger.

FIG. 2 is a perspective view of a tube element used in the heat exchanger according to the first embodiment.

FIG. 3 is a front view of a forming plate constituting the tube element according to the first embodiment.

FIG. 4 is a sectional view taken along line II of FIG. 2;

FIG. 5 is a front view of a forming plate constituting a tube element used in a heat exchanger according to a second embodiment.

FIG. 6 is a front view of a main part of a tube element used in a heat exchanger according to a third embodiment.

FIG. 7 is a sectional view taken along line II-II of FIG.

FIG. 8 is a front view of a main part of a tube element used in a heat exchanger according to a fourth embodiment.

9 is a sectional view taken along line III-III in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tube element 2 Fin 3 Forming plate 10, 10a Contact bead 15, 16 Tank part 17 Central partition part 18 Heat exchange medium passage 20 Folding passage part 30, 31, Non-contact bead

Claims (1)

(57) [Claims] 1. A multi-stage lamination in which a pair of tanks provided integrally or separately on one end side and a tube element having a substantially U-shaped heat exchange medium passage communicating with the pair of tanks is inserted through fins. In the heat exchanger, the heat exchange medium passage of the tube element is a folded passage portion, and a line connecting a tip of a center partition section that divides the heat exchange medium passage and a corner of the tube element is provided inside the heat exchange medium passage. Provide contact beads or non-contact beads protruding toward
And a heat exchange medium passage is formed except for the above-mentioned portion.
Tube element is provided with contact or non-contact beads
Heat exchanger characterized by the absence .