JP2588114Y2 - Automotive 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 an automotive heat exchanger.

[0002]

2. Description of the Related Art Various types of heat exchangers such as evaporators, condensers, heaters and radiators for engine cooling systems are used in automobiles. As shown in FIG. 4, in these heat exchangers, generally, flat tubes 1 and corrugated fins 2 are alternately laminated, and both ends of each of the flat tubes 1 are connected to a header 3, and the flat tubes 1 and corrugated fins 2, Further, the flat tube 1 and the header 3 are brazed to each other.

In the corrugated fin 2, as shown in FIG. 5, a turbulent flow is generated in the passing air to increase the heat exchange efficiency, and condensed water is scattered downstream of the heat exchanger along the flow of the air. A plurality of louvers 4 are formed for the purpose of flowing downward so as not to flow. As shown in FIG. 6, the louver 4 is provided with a plurality of cuts 5 at regular intervals in the direction of air flow on the surface of the corrugated fin 2, and is provided between the two adjacent cuts 5 in parallel with the cut 5. It is formed by setting a cut-and-raised reference line 6 and cutting and raising both sides of the cut-and-raised reference line 6 in opposite directions.

[0004]

However, in this conventional corrugated fin 2, since the louvers 4 are cut and raised in the same direction, a turbulent flow effect cannot be expected so much, and as shown in FIG. There is a problem that the condensed water bridge 7 generated between the louvers 4 remains and the flowability is poor. The present invention has been made in view of such a problem, and an object of the present invention is to provide a heat exchanger for automobiles having a corrugated fin having a louver shape having high heat exchange efficiency and good condensate flowability. .

[0005]

In order to achieve the above object, the present invention relates to a heat exchanger for automobiles in which flat tubes and corrugated fins are alternately laminated, and a plurality of louvers are provided in the corrugated fin by cutting and raising. The corrugated fins are provided with cuts at regular intervals along the direction of air flow, and a cut-and-raised reference line inclined with respect to the cut is set between two adjacent cuts, and both sides of the cut-and-raised reference line are set. Are cut and raised in opposite directions to form a louver. As a preferred embodiment, adjacent cut-and-raised reference lines may be reversed in a group of louvers. In addition, the cut-and-raised reference lines in the group of louvers may be parallel to each other, and may be opposite to the cut-and-raised reference lines in the louvers of the group adjacent to the group.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is an enlarged perspective view of a main part of the heat exchanger for an automobile according to the present invention, which is the same as the conventional heat exchanger shown in FIG. 5 except that the shape of the louver 4 of the corrugated fin 2 is different. Parts have the same reference numerals. As shown in FIG. 2A, the louver 4 of the corrugated fin 2 is provided with a plurality of cuts 5 at regular intervals in the air flow direction, and a gap between two adjacent cuts 5 in the air flow direction. An oblique cut-and-raise reference line 6 is provided, with the upstream surface raised upward and the downstream surface raised downward with respect to the reference line 6 as shown in FIG. 2B.

For this reason, the shape of the opening of the louver 4 as viewed from the upstream side is a wedge shape as shown in FIG. In addition, each reference line 6 is set to be alternately opposite in direction,
The direction of the wedge of the opening of each louver 4 is alternately opposite. The louver 4 is similarly formed on the corrugated fin 2 other than the illustrated surface.

In the heat exchanger having the corrugated fins 2 in which the louvers 4 are formed as described above, considering the air flow path between certain surfaces of the corrugated fins 2 as shown in FIG. The air is partially redirected to the lower left by the first louver 4 (arrow), and is redirected to the lower right by the next louver 4 (arrow). Thus, the flow of air, which was sequentially turned,
The condensed water adhering to the surfaces of the corrugated fins 2 and the louvers 4 is scattered downward, and is mixed with the air flow in the lower flow path to cause turbulence. As a result, the flow of air in each flow path of the corrugated fin 2 is in a turbulent state, and the heat exchange efficiency is improved.

The condensed water adhering to the corrugated fin 2 is
The louvers 4 successively carry the airflow downwardly directed downwards to be drained and discharged out of the vehicle, so that they are not scattered toward downstream equipment. Also, the bridge 7 of the condensed water attached between the adjacent louvers 4 moves toward the tip of the wedge by capillary action, as shown by the broken line, and falls as a water drop here, Or it flows along the surface and is discharged downward. In FIG. 2B, the surface on the upstream side with respect to the reference line 6 is raised upward, and the surface on the downstream side is raised downward, but this may be reversed. Then, as shown in FIG. 2C, the cut-and-raised direction of the louver 4 may be changed alternately.

FIG. 3 shows another embodiment of the present invention. In this embodiment, the cut-and-raised reference line 6 of the louver group A on the upstream side is used.
Are oriented in the same direction, and the reference line 6 of the louver group B on the downstream side is opposite to the reference line 6 of the louver group B. In this case, the cut-and-raised direction of the louver 4 may be the same in both the louver groups A and B as shown in FIG. 3B, or the louver group A as shown in FIG. 3C. And the louver group B may be reversed. Also in this embodiment, as in the previous embodiment, turbulence is caused in the flow of air in the flow passage, and condensed water has good flowability.

[0011]

As is clear from the above description, according to the present invention, since the louver is cut and raised based on the cut-and-raised reference line inclined with respect to the cut, the traveling direction of the air is twisted. Turbulence is likely to occur and heat exchange efficiency is improved. In addition, since the opening of the louver has a wedge shape, the condensed water bridged between the louvers moves in a direction in which the gap between the wedges becomes smaller due to the capillary phenomenon, and as a result, the flowability is good, and scattering to the downstream side is eliminated.

[Brief description of the drawings]

FIG. 1 is an enlarged perspective view of a main part of a heat exchanger according to the present invention.

FIG. 2A is a plan view showing a first embodiment in which the corrugated fins shown in FIG. 1 are cut and raised and reference lines are arranged, and FIG. 2B is a diagram in which the cut and raised directions of the louvers are set to be the same. FIG. 3A is a cross-sectional view taken along the line II in FIG. 3A, and FIG. 3C is a cross-sectional view taken along the line II in FIG.

3 (a) is a plan view showing a second embodiment in which the corrugated fins shown in FIG. 1 are cut and raised and reference lines are arranged, and FIG. 3 (b) shows the cut and raised direction of each louver group in the same direction. FIG. 2A is a cross-sectional view taken along the line II-II in FIG. 1A, and FIG. 2C is a cross-sectional view taken along the line II-II in FIG.

FIG. 4 is a front view of the heat exchanger for an automobile.

FIG. 5 is an enlarged perspective view of a main part of a conventional heat exchanger.

FIG. 6A is a plan view showing the arrangement of the cut and raised reference lines of the corrugated fin of FIG. 5, and FIG.
FIG. 3A is a sectional view taken along line III-III in FIG.

[Explanation of symbols]

1: Flat tube, 2: Corrugated fin, 4: Louver, 5: Cut, 6
… The cut-up line.

Continuation of the front page (56) References JP-A-54-6166 (JP, A) JP-A-61-161568 (JP, U) JP-A-54-159356 (JP, U) (58) Fields investigated (Int) .Cl. ⁶ , DB name) F28F 1/30

Claims (3)

(57) [Scope of request for utility model registration] 1. An automotive heat exchanger in which flat tubes and corrugated fins are alternately stacked, and a plurality of louvers are cut and raised in the corrugated fins, wherein the corrugated fins are arranged at regular intervals in the direction of air flow. A plurality of cuts are provided, a cut-and-raised reference line inclined with respect to the cut is set between two adjacent cuts, and both sides of the cut-and-raised reference line are cut and raised in opposite directions to form a louver. A heat exchanger for automobiles, characterized in that: 2. The vehicle heat exchanger according to claim 1, wherein adjacent cut-and-raised reference lines in the group of louvers are reversed. 3. The cut-and-raised reference lines in a group of louvers are parallel to each other and opposite to the cut-and-raised reference lines in a group of louvers adjacent to the group. Item 4. An automotive heat exchanger according to item 1.