JPH07151484A - Fin for heat exchanger - Google Patents

Abstract

PURPOSE:To attain effective use of louvers and efficient use of the whole heating surface area of a fin by making air move uniformly through a fin passage and also to improve a performance of heat exchange by increasing the heating surface area for a unit volume. CONSTITUTION:Fins for a heat exchanger which are located between tubes 1 and equipped with louvers located in a plurality of stages in parallel to the direction of flow of air, the louvers in other adjacent stages being located in phases shifted in the direction of length of the tubes 1. Air passages of fins 4, 5 and 6 divided by the louvers of the same stage are formed substantially square when viewed from the direction of the air flow.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention uniformly moves air in a fin passage to effectively utilize the louver and to utilize the entire heat transfer area of the fin, and increase the heat transfer area per unit volume. The present invention relates to a fin for a heat exchanger that has improved heat exchange performance.

[0002]

2. Description of the Related Art For example, in a heat exchanger such as a condenser or an evaporator of an air conditioner, radiating fins are arranged between flat tubes for guiding a refrigerant to promote heat exchange of the refrigerant. Conventionally, corrugated fins have been used that can take a large heat transfer area per unit volume.

For example, Japanese Utility Model Application Laid-Open No. 55-34146 discloses a fin in which a sheet metal is bent into a trapezoidal wave or a wavy shape, and they are arranged back to back.
In Japanese Patent No. 96178, adjacent strip-shaped louvers are arranged in an X shape in the air flow path, and in Japanese Utility Model Laid-Open No. 62-70276, two sheet metals are superposed and bent in a corrugated shape. Fins are shown, and Japanese Utility Model Laid-Open No. 2-109179 discloses a fin in which adjacent triangular wave louvers are arranged with a half-pitch phase shift.

However, in all of these fins, the cross-sectional shape of the air flow path is formed differently, and the flow resistance in the flow path is not uniform, so that the air flows unevenly in the center of the flow path with a small resistance, and the louver In addition to insufficient utilization of the heat transfer area of the fins or utilization of the total heat transfer area of the fins, the heat transfer area per unit volume is generally small, and sufficient heat exchange performance cannot be exhibited. In addition, Jitsukai Sho 55-34146 and 62-7
In the case of Japanese Patent No. 0276, since the adjacent fins are superposed in a relatively wide area, the heat transfer efficiency of the superposition section is low,
There was a fear of promoting the deterioration of heat exchange performance.

[0005]

SUMMARY OF THE INVENTION The present invention solves such a problem and allows air to flow evenly in the air passages of the fins so as to effectively use the louvers and the entire heat transfer area of the fins. It is an object of the present invention to provide a fin for a heat exchanger, which is capable of improving the heat exchange performance by increasing the heat transfer area per unit volume.

[0006]

Therefore, the fin for heat exchanger of the present invention is provided between the tubes and is provided with louvers arranged in a plurality of stages in parallel with the flow direction of the air, and the other adjacent stages. In the heat exchanger fins in which the louvers of the above are arranged with the phases shifted in the length direction of the tube, the air passages of the fins divided by the louvers at the same stage are formed into a substantially square shape when viewed from the air flow direction, and The air is evenly distributed in the flow path, the louvers are effectively used and the total heat transfer area of the fins is utilized, and the heat transfer area per unit volume is increased to improve the heat exchange performance. Is characterized by.

[0007]

[Operation] The air passage of the fins divided by the louvers in the same stage
It is formed in a square shape when viewed from the direction of air flow, to make the flow resistance in the air flow path uniform, and to allow the air to flow uniformly. This will make effective use of the louvers and the total heat transfer area of the fins. Further, by forming the air passage in a substantially square shape, the heat transfer area per unit volume increases when the tube intervals are constant. Each corner is formed at a right angle to ensure a relatively wide minimum clearance in the air passage. Therefore, at the time of heat exchange, there is no possibility that the condensed liquid film adheres to the relevant part to block the passage, or the hydrophilic liquid film covering the fin surface adheres to the relevant part and closes the passage.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention is installed in a vehicle air conditioner as follows.
The illustrated embodiment applied to a condenser as a heat exchanger will be described. In FIGS. 1 to 4, 1 is a flat tube made of aluminum that guides a refrigerant, and corrugated fins 2 are brazed between them. This tube 1
A large number of the fins 2 and the fins 2 are stacked to form a capacitor core.

The fins 2 are made of, for example, an aluminum brazing sheet which is a fin plate material 3 whose both surfaces are coated with a brazing material, which is press-molded into three stages in the air flow direction shown by the arrow in FIG. Louver fins 4, 5,
6 are sequentially and continuously formed.

These louver fins 4, 5 and 6 are formed in a substantially square shape having the same width and the same front shape as seen from the air flow direction, and the square has four sides arranged in parallel to the air flow direction. It is configured as a louver. The louver fins 4, 5 and 6 in each of these stages are arranged with a phase shift in the length direction of the tube 1 by 1/3 of the length W of the diagonal line of the square as shown in FIG. The pair of tops arranged in the above are brazed to the inner peripheral surfaces of the tubes 1, 1.

That is, the fin plate material 3 is a fin blank 3a having the same width in the direction orthogonal to the air flow direction.
3b and 3c are divided in parallel with each other, a common folding line L is provided at the center in the lengthwise direction, and triangular wave-like wavy shaped portions 4a continuous in the lengthwise direction are provided on both sides of the folding line L.
4b, 5a, 5b, 6a, 6b are formed, and these are arranged symmetrically with respect to the folding line L, and after folding, the upper and lower bent portions are overlapped to form a substantially square air passage. Is formed.

In the figure, reference numerals 7a, 7b, 8a and 8b denote fin-shaped flat flaps located on both sides of the fin blanks 3b and 3c.

5 to 7 show another embodiment of the present invention, and the same reference numerals are used for the portions corresponding to those of the above-mentioned embodiment. Of these, in the embodiment shown in FIG. 5, instead of disposing a single fin 2 between the tubes 1 and 1, two fins 2 and 2 are superposed in an up-and-down in-phase state, and a refrigerant per unit volume is cooled. It is characterized by improving the heat exchange efficiency. In this case, it is also possible to superpose three or more fins 2 between the tubes 1 and 1.

In the embodiment shown in FIG. 6, instead of arranging the three-stage louver fins 4, 5, 6 in the air flow direction between the tubes 1, 1, two-stage louver fins 4, 5 are arranged and they are arranged. Is arranged by shifting the phase in the length direction of the tube 1 by ½ of the diagonal length W of the substantially square forming the louver, thereby simplifying the configuration and facilitating the production. ing.

In the embodiment shown in FIG. 7, four stages of louver fins 4,5, 6, 9 are arranged in the direction of air flow between the tubes 1 and 1, and the diagonal lengths of the substantially squares forming the louvers are formed. It is characterized in that it is arranged with a phase shift of 1/4 of W in the length direction of the tube 1 so as to improve the heat exchange efficiency per unit volume. In the embodiment of FIGS. 6 and 7, two or more fins 2 are provided between the tubes 1 and 1.
It is also possible to arrange the above.

In the case of manufacturing the heat exchanger fin having the above-mentioned structure, a fin plate material 3 having a predetermined length and made of an aluminum brazing sheet, both surfaces of which are coated with a brazing material, is prepared and press-molded. A plurality of right-angled isosceles triangular wave-shaped forming portions 4a, 4b, 5a, 5 which are continuous in the length direction of the fin blanks 3a, 3b, 3c.
b, 6a, 6b are formed.

That is, the wavy shaped portions 4a, 4b, 5a,
5b, 6a, 6b are formed on the wavy shaped portions 4a, 4a, 5b, 6a, 6b with a common fold line L provided at the center of the plate member 3 as shown in FIG.
5a, 6a and corrugated forming parts 4b, 5b, 6b,
Moreover, each of these sets is formed symmetrically with respect to the folding line L, and is adjacent to the corrugated forming portions 4a, 5a, 6
a and the wavy shaped portions 4b, 5b, 6b are 1/3 of the width of the hypotenuse of the triangle, that is, 1/3 of the length W of the diagonal line of the substantially square when the louver fins 4, 5, 6 are viewed from the air flow direction. Are arranged with a phase shift in the length direction.

After that, the plate member 3 is bent around the fold line L in the direction of the arrow in FIG. 4 through appropriate means, and the corrugated parts 4a, 5a, 6a and the corrugated parts 4b, 5 are formed.
b and 6b are polymerized via each bent edge. This situation is as shown in FIGS. 3A to 3C, in which the louver fins 4 in one stage overlap the bent edge and the edge, and the louver fins 5 and 6 in the two and three steps form the bent edge and the fin flap 7a. , 7b, 8a,
8b and are polymerized.

While maintaining the superposed state of the louver fins 4, 5 and 6, the louver fins 4 and 5 are arranged between the tubes 1 and 1, and the louver fins 4 and 5 are laminated in multiple stages and temporarily fixed with clips or the like. , Bring in the brazing furnace and braze their contact parts.

In the heat exchanger fin thus manufactured, the louver fins 4, 5 and 6 at each stage are provided with a plurality of substantially square air passages as viewed from the air flow direction, and the air passages are arranged parallel to the air flow direction. The four sides of each square are made to function as louvers, and the adjacent louvers at the other stages are arranged with their phases shifted in the length direction of the tube 1.

In this case, in the substantially square air passage, when the interval between the tubes 1 and 1 is constant, the heat transfer area per unit volume is increased as compared with the conventional triangular air passage, and the heat exchange is performed. Performance is improved. In addition, since each corner is formed at a right angle and the minimum gap in the air passage is relatively wide, a condensate film adheres to that portion during heat exchange to block the passage or the fin surface. The hydrophilic liquid film covering the
There is no fear of sticking to the part and blocking the passage. Moreover, since the air resistance in the substantially square air passage is substantially uniform, the air flows evenly in the passage, and the air is distributed in the center of the passage having the small resistance like the conventional irregular air passage. There is no uneven flow, and effective utilization of the louver or utilization of the total heat transfer area of the fins can be achieved.

[0022]

As described above, in the heat exchanger fin of the present invention, the air passages of the fins divided by the louvers at the same stage are formed in a substantially square shape when viewed from the air flow direction. The flow resistance inside becomes uniform and the air flows evenly. Therefore, unlike conventional air passages of different shapes, air does not flow unevenly to the central portion where the flow resistance is small,
The louvers can be effectively used and the entire heat transfer area of the fins can be used. Further, by forming the air passage in a substantially square shape, the heat transfer area per unit volume increases when the tube intervals are constant, and heat exchange performance can be improved correspondingly. Furthermore, the air passage has a substantially square shape. Since the corners are formed at right angles, it is possible to secure a relatively wide minimum clearance in the air passage. Therefore, it is possible to prevent the condensed liquid film from adhering to the relevant part during heat exchange to block the passage, and the hydrophilic liquid film covering the fin surface from adhering to the relevant part and blocking the passage. it can.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of the present invention.

FIG. 2 is a plan view of FIG. 1, which is shown in a slightly reduced size.

3 (a) is shown in a slightly enlarged manner in a cross section taken along the line AA of FIG. 2B is shown in a slightly enlarged manner in a cross section taken along the line BB of FIG. 2C is shown in a slightly enlarged manner in a cross section taken along the line CC of FIG.

FIG. 4 is a perspective view showing an intermediate state of the manufacturing process of the present invention,
The shaping | molding state of the wavy shaping | molding part is shown.

FIG. 5 is a front view showing another embodiment of the present invention, in which two fins are superposed and arranged between tubes.

FIG. 6 is a front view showing still another embodiment of the present invention, showing an example of a parallel two-stage louver.

FIG. 7 is a front view showing another embodiment of the present invention, showing an example of parallel four-stage louvers.

[Explanation of symbols]

 1 tube 4, 5, 6 louver fin

Claims (1)

[Claims] 1. A heat system comprising louvers arranged between tubes and arranged in a plurality of stages in parallel with the direction of air flow, in which adjacent louvers are arranged out of phase in the length direction of the tubes. A fin for a heat exchanger, characterized in that, in the fin for an exchanger, an air passage of the fin divided by the louvers at the same stage is formed in a substantially square shape when viewed in the air flow direction.