JPH09196577A - Heat exchanging element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat exchanging element improving a heat exchanging efficiency by generating turbulent flow positively in fluid flowing alternatively within a plurality of flow passages. SOLUTION: Rectangular flat plate-like heat exchanging plates 11 having end members 12 at both opposing edges are piled up in a vertical direction while being rotated by 90 deg. with their faces being directed in the same direction from each other so as to form flow passages 14a, 14b between adjoining heat exchanging plates 11 along a longitudinal direction of the end member 12 and at the same time some coil-like members 15 extending along a substantial full length in a width direction crossing at a right angle with a flowing direction of each of the flow passages 14a, 14b are spaced apart by a predetermined distance within each of the flow passages 14a, 14b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention reduces the load on an air conditioner to obtain an energy saving effect by performing ventilation while exchanging heat between the supply of outside air and the exhaust of indoor air. The present invention relates to a heat exchange element used in an exchange unit.

[0002]

2. Description of the Related Art FIG. 3 is a perspective view showing a conventional general heat exchange element for performing heat exchange without mixing the outside air with the indoor air, and FIG. 4 is a partially enlarged front view thereof. ,
FIG. 5 is a cross-sectional view taken along the line AA of FIG.

As shown in these figures, the conventional general heat exchange element 1 has, for example, flame retardant on the surface of a rectangular flat plate heat exchange plate 2 having a moisture permeability for the purpose of total heat exchange. Wavy corrugated fin 3 made of paper or plastic
Are bonded together to form a corrugated cardboard heat exchange element 5 having a plurality of flow paths 4 each having a triangular cross section. Then, the heat exchange elements 4 are laminated in multiple layers while shifting the heat exchanging elements 4 from each other by 90 degrees while sealing the corners at the four corners and arranging the metal shape-supporting pillars 6 that fit into the rails when the unit is assembled. It was composed by doing.

This type of heat exchange element 1 is formed into a predetermined shape by cutting, for example, a plurality of heat exchange elements 5 which are laminated in a plurality of layers, and in order to prevent air mixing,
It was necessary to firmly bond the heat exchange plate 2 and the corrugated fins 3 together.

Then, the heat exchange element 1 is incorporated in the heat exchange unit, the air flowing into the heat exchange unit from one flow path is supplied to the indoor side, and the air flowing into the heat exchange unit from the other flow path. When discharging the
The air flowing into the indoor side and the air flowing out to the outdoor are further placed in the multi-layer flow passages 4 inside the heat exchange element 1, that is, flow alternately in a plow shape, and heat exchange is performed here. ing.

Here, for example, Japanese Patent Laid-Open No. 59-142390.
JP-A No. 60-21882 or JP-A No. 60-21882 discloses a heat exchange plate (fin) in which a spring structure (spring fin) made of a fine metal wire having good thermal conductivity is thermally coupled to the heat exchange plate. There has been proposed a structure in which the heat dissipation (fin) area is enlarged by arranging it over almost the entire area while being connected.

[0007]

However, in the former case of the above-mentioned conventional example, not only the large number of triangular flow passages formed by corrugated fins have a small flow passage sectional area and a large pressure loss, but also the heat exchange efficiency is high. Since the number of inferior corrugated fins and the heat exchange plate is increased, the heat exchange plate cannot be effectively used. Furthermore, since the inner wall of the flow path is smooth,
Since the temperature boundary layer easily develops and the flow velocity is generally slow with respect to the shape of the flow path, the flow becomes a laminar flow and the heat exchange efficiency decreases.

Further, not only a pillar or a screw for holding the shape is required, but also it is necessary to cut out into a predetermined shape or to firmly bond the corrugated fin and the heat exchange plate. There is a problem that this leads to an increase in manufacturing man-hours and that the quality of the product tends to vary.

The latter disclosed in Japanese Patent Laid-Open No. 59-142390 or Japanese Utility Model Laid-Open No. 60-21882 uses a spring structure in order to increase the heat radiation area. Not only is the heat exchange performed between the fluids that alternately flow therein, but it is also necessary to provide the spring structure over the entire area of the heat exchange plate while adhering the spring structure to the heat exchange plate.

The present invention has been made in view of the above-mentioned circumstances, and aims to improve heat exchange efficiency by positively generating turbulence in a fluid alternately flowing in a plurality of flow paths.
Moreover, it is an object of the present invention to provide a heat exchange element which can be relatively easily assembled and configured with a sealing performance being high and air being surely prevented from mixing.

[0011]

In the heat exchange element according to the present invention, heat exchange plates in the shape of a rectangular flat plate provided with end materials on opposite side edges are stacked vertically while rotating 90 ° each in the same direction. Together, a flow path is formed along the length direction of the end material between the heat exchange plates adjacent to each other, and within each flow path over substantially the entire length in the width direction orthogonal to the flow direction of the flow path. It is characterized in that the extending coil-shaped members are arranged at a predetermined interval along the flow direction of the flow path.

Further, one flow path is formed between the facing end materials, and the coil member is bridged between the both end materials.

[0013]

According to the present invention having the above-described structure, the coil-shaped member disposed in the flow channel disturbs the fluid flowing in the flow channel, and the temperature in the vicinity of the inner wall surface of the flow channel is disturbed. The boundary layer can be actively destroyed to generate turbulent flow with high thermal conductivity. Here, one flow path is formed between the end materials facing each other, and the coil-shaped member is bridged between the both end materials to reduce the number of parts and the manufacturing man-hour, and at the same time, reduce the heat transfer area. Can be increased.

[0014]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is an exploded perspective view showing an embodiment of the heat exchange element of the present invention. As shown in FIG.
The heat exchange element 10 in the present embodiment is provided with a rectangular flat plate-shaped heat exchange plate 11. This heat exchange plate 11
On one surface, that is, on both side edges of the surface side facing each other in the figure, a scrap material 12 is provided over the entire length in the length direction,
Further, a total of three ribs 13 which are parallel to the both end members 12 and have the same height are arranged between the both end members 12.

Then, the heat exchange plates 11 are sequentially laminated in the vertical direction while rotating in the same direction by 90 degrees, so that the first flow passage 14a and the second flow passage 14b orthogonal to each other are formed in the vertical direction. A heat exchange element 10 having alternating sides is constructed.

Here, each of the flow paths 14a and 14b is partitioned into a box shape on the left and right sides by end pieces 12 and ribs 13 and on the upper and lower sides by heat exchange plates 11 adjacent to each other, and the heat exchange plates 11 are sandwiched between them. Then, above and below this, the first channel 14a
And the second flow path 14b are formed. In this way, the flow path 14 having a rectangular cross section and a relatively large flow path cross-sectional area is formed.
By forming a and 14b, the pressure loss as a heat exchange element can be reduced.

The end material 12 and the rib 13 are provided between the end material 12 and the rib 13 and between the ribs 13 adjacent to each other.
A coil-shaped member 15 that extends over substantially the entire length of the flow path 14a, 14b in the width direction orthogonal to the flow direction of the flow passages 14a and 14b is arranged so as to extend across the entire length.

The coil-shaped member 15 includes the flow paths 14a, 1
Along the flow direction of 4b, separated by a predetermined distance, that is,
The flow paths 14a and 14b are arranged near the inlet, near the outlet, and in the approximate center thereof. The coil-shaped member 15 is formed by spirally winding fine metal wires at a predetermined pitch, and the outer diameter of the spiral of the coil-shaped member 15 is
The height is set to be substantially equal to the height of the scrap 12.

In this way, by arranging the coil-shaped members 15 extending over substantially the entire length in the width direction in the flow paths 14a, 14b at predetermined intervals, the coil members 15 can be used in the flow paths 14a, 14b. It is possible to generate a turbulent flow having a high thermal conductivity by disturbing the fluid flowing through the chamber and actively destroying the temperature boundary layer near the inner wall surface of the flow channel.

The heat exchange element 10 is installed inside the heat exchange unit, the air flowing into the heat exchange unit from one flow passage is supplied to the indoor side, and the air flowing into the heat exchange unit from the other flow passage. When the air is discharged out of the room, the air flowing into the room and the air flowing out to the room are
Heat exchange is performed here by alternately flowing the flow paths 14a and 14b inside the heat exchange element 10 in a plow shape.

At this time, as described above, each flow path 14a, 1
The air flowing in 4b becomes a turbulent flow, and the heat transfer coefficient in the turbulent flow is larger than the heat transfer coefficient in the laminar flow, so that the heat exchange efficiency is improved.

FIG. 2 shows another embodiment. The difference of this embodiment from the above-mentioned embodiment is that end members 12 provided on both side edges of the heat exchange plate 11 are opposed to each other, that is, ribs are provided. Without this, one flow path 14a, 14b is formed, respectively, and the coil-shaped member 15 extending over substantially the entire width in the width direction is arranged between both end members 12. As described above, the flow path is secured by the end materials 12 facing each other, and by using a material having high rigidity for the coil-shaped member, the rib can be eliminated, and the number of parts and the number of assembling steps can be reduced. Along with this, the heat transfer area can be increased.

[0023]

As described above, according to the present invention,
The coil-shaped member placed in the flow channel disturbs the fluid flowing in the flow channel, and actively breaks the temperature boundary layer near the inner wall surface of the flow channel to flow alternately in multiple flow channels. A turbulent flow having a high thermal conductivity is generated in the fluid, so that the heat exchange efficiency can be improved.

Moreover, not only can the flow passage cross-sectional area be increased to reduce the pressure loss, but the heat exchange plates can also be rotated 90 degrees with respect to each other, and the heat exchange plates can be sequentially laminated to form a heat exchange element of uniform quality. Can be easily assembled.

Further, one flow path is formed between the end materials facing each other, and a coil-shaped member is laid between the both end materials to reduce the number of parts and the manufacturing man-hour, and to increase the heat transfer area. Can be increased.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of the present invention.

FIG. 2 is a perspective view showing another embodiment.

FIG. 3 is a perspective view showing a conventional example.

FIG. 4 is a partially enlarged front view of the same.

FIG. 5 is a sectional view taken along line AA of FIG. 4;

[Explanation of symbols]

 10 heat exchange element 11 heat exchange plate 12 end material 13 ribs 14a, 14b flow path 15 coil-shaped member

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Taku Kawanishi 4-2-1 Honfujisawa, Fujisawa City, Kanagawa Prefecture EBARA Research Institute

Claims (2)

[Claims] 1. A heat exchanger plate in the shape of a rectangular flat plate provided with end pieces on opposite side edges is stacked vertically while rotating 90 degrees in the same direction, and end pieces are placed between adjacent heat exchange plates. Forming a flow path along the length direction of each of the flow paths, and in each flow path, a coil-shaped member extending over substantially the entire length in the width direction orthogonal to the flow direction of the flow path is provided in the flow direction of the flow path. A heat exchange element characterized in that the heat exchange elements are arranged along a predetermined distance. 2. The heat exchange element according to claim 1, wherein one flow path is formed between the end materials facing each other, and the coil member is bridged between the end materials.