JP2002090082A - Heat exchanger - Google Patents

Abstract

(57) [Summary] [Problem] In a heat exchanger in which all adjacent fin surfaces are formed in parallel with each other, when the passing wind passing through the fins increases rapidly, dew condensation water is formed on the fins at the lower end of the wind. There is a problem that the water easily accumulates and the dew condensation water covers adjacent fin surfaces. Further, in a heat exchanger in which all adjacent fin surfaces are formed at a fixed inclination angle, dewed water is easily retained inside the fin hills, so that the air circulating area is reduced, and the performance is reduced and the ventilation resistance is reduced. It is increasing. SOLUTION: Each corrugated fin has first fin portions 17a and 17b in which louvers of adjacent fin surfaces are formed parallel to each other at a central portion in a ventilation direction, and one fin portion of an adjacent fin surface at one end portion in a ventilation direction. The louvers are composed of the second fin portions 18a and 18b which are formed to be inclined, and have a shape in which it is difficult to retain water at the center of the fin where dew condensation water is actively generated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a heat exchanger such as an evaporator.

[0002]

2. Description of the Related Art Conventionally, as a heat exchanger, for example, a heat exchanger disclosed in Japanese Utility Model Laid-Open No. 06-74865 is known.

[0003] This type of heat exchanger, as shown in FIG.
Generally, flat tubes 1 and corrugated fins 2 are alternately laminated, and the upper and lower ends of each flat tube 1 are
And a flat tube 1 and a corrugated fin 2 and a flat tube 1 and a header 3 are brazed to each other.

In the corrugated fin 2, as shown in FIG. 7, a turbulent flow is generated in the passing air to increase the heat exchange efficiency, and the condensed water 5 flows downstream of the heat exchanger along the flow of the air. A plurality of louvers 4 are formed to flow down so as not to scatter.

[0005]

In the above heat exchanger,
All adjacent fin surfaces are formed in parallel.
In such a heat exchanger, when the passing wind passing through the fins increases rapidly, dew condensation water easily accumulates on the fins at the lower end of the wind, and the dew condensation water covers adjacent fin surfaces. May be. Further, the dew condensation water is easily scattered from the wind end to the outside of the heat exchanger.

On the other hand, as shown in FIG. 8, there is also known a heat exchanger in which all adjacent fin surfaces are formed at a fixed inclination angle. In such a heat exchanger, dew condensation water is easily retained inside the fin ridges, so that the air circulating area is narrowed, resulting in reduced performance and increased ventilation resistance.

The present invention provides a heat exchanger having a fin structure in which dew water hardly accumulates on the fins at the lower end of the wind, and hardly retains dew water inside the fin ridges.

[0008]

According to a first aspect of the present invention, there is provided a heat exchanger in which flat tubes and corrugated fins are alternately arranged side by side. A first fin portion in which louvers of adjacent fin surfaces are formed parallel to each other, and a second fin portion in which louvers of adjacent fin surfaces are formed at one end in the ventilation direction. It is. In this configuration, the shape is such that it is difficult to retain water at the center of the fin where dew condensation water is active, so that drainage is good, and the adjacent louvers form an inclination angle at the lower end of the fin, so that the fin has a sharp angle. Even when the air volume increases, the phenomenon that dew condensation water covers the fin surfaces can be prevented.

According to a second aspect of the present invention, in the heat exchanger according to the first aspect, the fin height of the second fin portion is lower than the fin height of the first fin portion. Since the wind speed is high at the central portion of the fin, the drainage performance is good, and the wind speed at the lower end portion of the fin is low, so that the dew condensation water can be prevented from jumping out.

According to a third aspect of the present invention, in the heat exchanger according to the first or second aspect, the second fin portion is formed at both ends, and the second fin portion is 10 to 30% of the entire width of the fin. Since it can be formed in a symmetrical shape in the ventilation direction,
It is easy to manufacture and the assembly work can be performed easily.

According to a fourth aspect of the present invention, in the heat exchanger according to any one of the first to third aspects, the first fin portion and the second fin portion are formed in a portion above a vertical center of the corrugated fin. Since the drainage of the upper part of the fin is improved and it flows downward, the flow of the dew condensation water is formed and the dew water is hardly retained, and the adjacent fin surface is covered with the dew water. Can be prevented.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to the drawings. Laminated heat exchanger 1 of this embodiment
0, as shown in FIG. 1, a plurality of flat tubes 11 and corrugated fins 12 for heat dissipation are laminated in parallel in the lateral direction. A header tank 13 is provided below the stacked flat tubes 11 and corrugated fins 12, and each open end of the flat tubes 11 is brazed to the header tank 13. The corrugated fin 12 is provided with a louver 14 formed by cutting out in the left-right direction.

FIG. 2 is a partial plan view of the corrugated fin 12 according to the first embodiment of FIG. 1, and FIGS. 3 (a) and 3 (b) are sectional views taken along line AA of FIG. FIG. Each of the corrugated fins 12 is formed at a predetermined inclination angle. Louver 15 at the center in ventilation direction F
As shown in FIG. 3B, a is cut and raised on both sides of the fin, imagining a reference line inclined with respect to the cut surface of the louver so that the end faces of the opposing louvers are parallel to each other. . Since the formation of the louver structure is described in Japanese Utility Model Registration No. 2588114, detailed description thereof will be omitted. On the other hand, as shown in FIG. 3A, the louver 16a at the lower end of the wind in the ventilation direction F is cut and raised in parallel with the fins, and the opposing louvers are formed to be inclined with respect to each other.

The fins on which the louvers 15a and 16a are formed are respectively a first fin portion 17a and a second fin portion 18
a, and the width w of the second fin portion 18a is in the range of 10 to 30% with respect to the entire width W of the fin. If the width w of the second fin portion 18a is less than 10%, the condensed water may scatter from the end portion, and if the width w is more than 30%, the first fin portion 18a may have the first width.
The number of the fin portions 17a is reduced, and the flow of the condensed water in the first fin portion is deteriorated, which is not preferable.

FIG. 2 does not show the full width of the corrugated fins 12 to simplify the explanation. for that reason,
Although not shown, a fin portion similar to the second fin portion 18a on which the louver 16a is formed is provided at the wind upper end portion in the ventilation direction F.

In the first embodiment, the louvers 15a and the louvers 16a are formed for each louver group. A fin portion having an inclined surface may be formed.

FIGS. 4 and 5 relate to the second embodiment. Each of the corrugated fins 12 is formed in a different shape in the width direction in the ventilation direction. As shown in FIG. 5B, the first fin portion 17b and the louver 15b at the center in the ventilation direction F are formed such that the opposing fin surface and the end surface of the louver 15b are parallel to each other. On the other hand, the ventilation direction F
Fin portion 18b and louver 16b at the lower end of wind
As shown in FIG. 5 (a), the fin face and the end face of the louver 16b are formed so as to be inclined and face each other.

In this embodiment, from one fin material,
The first fin portions 17b and 18b are formed, and the height h of the first fin portion 17b is equal to the height of the second fin portion 18b.
It is slightly lower than the height H of b. In this case, 1
There is an advantage that the first fin portion 17b and the second fin portion 18b can be formed at once from a single plate. At the same time, since the height of the first fin portion 17b is low, there is an advantage that the wind speed is high and drainage is good.

In the second embodiment, the height h of the first fin portion 17b is formed to be slightly lower than the height H of the second fin portion 18b. It may be what you did. Also in this embodiment, the width w of the second fin portion 18b on which the louver 16b is formed is in the range of 10 to 30% of the total width W of the fin.

The first fin portions 17a and 17b of the first and second embodiments may be formed over the entire length of the fin in the vertical direction in FIG. 1, but are formed only on the upper portion. The lower portion may be the inclined fin portions 16b, 18b. By doing so, the flow of the condensed water in the upper part is improved, and the flow of the condensed water from the upper part to the lower part can be positively generated, which has an advantage that the flow as a whole is improved.

[0021]

According to the present invention, each corrugated fin has a first fin portion in which louvers on adjacent fin surfaces are formed parallel to each other at a central portion in the ventilation direction, and an adjacent fin portion at one end portion in the ventilation direction. The louver of the surface is composed of the second fin portion formed to be inclined, and it is difficult to retain water at the central portion of the fin where dew condensation is active, so that drainage becomes good, and at the wind end portion of the fin, Since the adjacent louvers form an inclination angle, even when the air volume increases rapidly, it is possible to prevent a phenomenon in which dew condensation water covers the fin surfaces.

The fin height of the second fin portion is
When the fin height is lower than the fin height of the first fin portion, the wind speed increases in the central portion of the fin where dew condensation water is actively generated, the drainage becomes good, and the wind speed decreases at the lower end portion of the fin. Can be prevented from jumping out.

Further, when the second fin portions are formed at both ends, the second fin portions can be formed in a symmetrical shape in the ventilation direction, so that it is easy to manufacture and the assembling work can be performed easily.

Further, the first fin portion and the second fin portion are
If the corrugated fins are formed above the center in the vertical direction, the drainage of the upper part of the fins is improved and the fins flow downward. It can be prevented from being covered with dew condensation water.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a heat exchanger to which the present invention is applied.

FIG. 2 is a partially enlarged view of a corrugated fin according to a first embodiment to which the present invention is applied.

FIGS. 3 (a) and (b) are lines AA and BB in FIG.
It is a line sectional view.

FIG. 4 is a partially enlarged view of a corrugated fin according to a second embodiment of the present invention.

5 (a) and 5 (b) are lines AA and CC of FIG. 4;
It is a line sectional view.

FIG. 6 is a schematic view of a conventional heat exchanger.

FIG. 7 is an enlarged partial view of a conventional heat exchanger.

FIG. 8 is a schematic view of another conventional heat exchanger.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Flat tube 12 Corrugated fin 13 Header tank 14 Louver 15a, 15b Louver 16a, 16b Louver 17a, 17b 1st fin part 18a, 18b 2nd fin part W Full width of fin w Width of second fin H Total height of fin h 1st Fin height F Ventilation direction

Claims (4)

[Claims] 1. A heat exchanger in which flat tubes and corrugated fins are alternately arranged side by side. Each of the corrugated fins has a louver on an adjacent fin surface at a central portion in a ventilation direction. A heat exchanger comprising: a first fin portion formed in parallel; and a second fin portion formed by inclining a louver of an adjacent fin surface at one end in a ventilation direction. 2. The heat exchanger according to claim 1, wherein the fin height of the first fin portion is lower than the fin height of the second fin portion. 3. The second fin portion is formed at both ends,
The heat exchanger according to claim 1, wherein the second fin portion has a width of 10 to 30% of a total width of the fin. 4. The first fin portion and the second fin portion,
The heat exchanger according to any one of claims 1 to 3, wherein the heat exchanger is formed in a portion above a center in a vertical direction of the corrugated fin.