JPH0820124B2 - Heat exchange laminated structure with flow regulation performance of heat carrier liquid - 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 exchange laminated structure having the ability to regulate the flow of a heat carrier liquid for the purpose of restraining the movement of the heat carrier liquid and allowing the heat carrier liquid to properly flow down.

[0002]

2. Description of the Related Art The inventor of the present application has been engaged in research on the flow regulation control technology of a heat medium liquid flowing down for many years, and has made many trial products. The initial management technique employs a method in which the heat medium liquid is finely separated into veins and flows down along the heat exchange surface. As a technique for performing efficient heat exchange by finely separating the flowing heat carrier liquid and spreading a relatively small amount of liquid over the entire heat exchange surface, there is a representative technique disclosed in Japanese Patent Laid-Open No. 58-
There is No. 205056 (Japanese Patent Publication No. 5-41902). This kind of leaf vein flow regulation technology has achieved industrial success, and its principle has already been applied to many products. However, this diversion system requires skill in operation of the rectifying means, has a difficulty in maintenance, and there is still room for improvement.

Japanese Patent Application Laid-Open No. Sho 6-1994 by the same holder as the applicant
No. 3-297966 has been proposed by the applicant of the present invention as a next-generation flow-down technology that replaces the above-described leaf vein flow-down method, and is being researched and developed. The feature of this system is a simple structural principle in which the heat medium supply pipe (heat transfer pipe) of the heat exchanger is made into a flat material and adhered to the surface of the fin to be integrated.
A flat material is equivalent to a heat transfer tube divided vertically and expanded into a flat surface.A strip-shaped hydrophilic material is used for this flat material, and this is placed on the surface of the heat exchange plate corresponding to the fins of the heat exchanger. On the other hand, it is a method of performing heat exchange by allowing only the heat medium liquid that was in contact with the inner wall of the conventional heat transfer tube to flow down along the hydrophilic material. With the advent of such a novel structural style, even low-temperature heat exchangers with enormous heat exchange areas can be manufactured at extremely low cost.

The applicant of the present invention prototyped a sheet having the above-mentioned structure and conducted a comprehensive evaluation including mass production technology. JP-A-6
According to the structural mode described in JP-A-3-297966, a sheet having a structure in which a hydrophilic strip-shaped hydrophilic material was adhered to the surface of a hydrophobic base material at intervals with a space between them was prototyped, and the examination was added to this. . For the adhesion of hydrophilic materials, a method using a liquid adhesive and a method using heat welding have been tried. as a result,
It has been revealed that the seat having the above-mentioned structure has the following problems.

[0005]

Since a structure in which two kinds of materials, that is, a base material and a hydrophilic material, are adhered to each other and integrated is adopted, there is a phenomenon that the materials are separated from each other under a severe use environment. Occurrence is to be recognized. As a result of examining the cause of peeling, it was found that several factors are involved in this phenomenon. The adhered hydrophilic material swells when impregnated with the heat medium liquid, and tends to contract when dried. The effect of expansion and contraction in the length direction of the material is serious, and shear debonding or material breakage at the adhesive interface is observed. As a method of making it difficult to peel off, we also considered taking a large welding margin of the hydrophilic material on the base material, but it has a large effect on the water retention of the strip, and it is necessary to control the setting of processing conditions such as temperature, rolling pressure, curing time etc. It is difficult and lacks concreteness as a breakthrough. In the case of using a liquid adhesive, increasing the amount of the adhesive used does not solve the problem, and as in the case of welding, the water retention is remarkably reduced and the regulation effect is adversely affected, which makes it difficult to adopt. Secondly, since the hydrophilic material has a remarkably large expansion / contraction amount in the length direction as compared with the width direction, peeling on the side free end side occurs preferentially to the central portion. That is, the initial peeling of the hydrophilic material occurs continuously in the length direction of the edges on both sides of the material, leaving the central part of the material, and then the central part also peels off.
The middle part of the material is completely separated from the surface of the base material and becomes unrestrained.

Even in the case where a substrate made of a hydrophilic material alone is coated with a hydrophobic material in a strip shape, it is naturally expected that the peeling phenomenon will occur due to the same principle as described above. The same applies to the effect when peeling occurs.

When the hydrophilic material and the hydrophobic material are separated from each other, the flowing liquid exhibits various behaviors. If the hydrophilic material is placed on the upper surface of the base material, the hydrophilic material itself floats largely with respect to the flowing liquid, and the hydrophilic material cannot be fixed in place. Under these circumstances,
The hydrophilic material itself cannot sufficiently exhibit the water retention performance, and the liquid that contacts the hydrophobic base material flowing under the hydrophilic material slides on the surface of the base material and laterally moves, which disturbs the regulation effect. The lateral movement of the downflowing liquid due to the floating of the hydrophilic material may affect an adjacent downflow path, propagate from this downflow path to an adjacent downflow path, and may affect the entire downflow surface.
In extreme cases, the regulation effect disappears. Front side (upper side) when hydrophilic material is installed on the back side (lower side) of the substrate
Unlike the above case, the hydrophilic material slackens and hangs down from the surface of the base material, and the heat transfer medium liquid flowing down falls off from the slackened part. If such a dropout of the liquid occurs even at one place in the flow-down path, there is no liquid moving from the dropout point to the downstream side, and a large heat exchange loss occurs. It is possible to temporarily repair the peeling of these hydrophilic materials by re-adhesion, but once this type of peeling occurs, the gel adhesive for repair is impregnated by the hydrophilic material and the repaired area The water retention capacity of the water drops below the upper and lower positions, and the flow-down property is likely to be unstable. Also, since repairs are only temporary and cannot withstand long-term use, seats must be replaced sooner or later. In actual maintenance, considering repair costs, it is better in terms of cost to replace the sheet promptly if such peeling or separation occurs.

There are various base materials for forming the heat exchange surface, including those having poor adhesiveness, and there is a circumstance that the material of the hydrophilic material must be appropriately selected depending on the properties of the heating medium liquid. In consideration of the demand for such a combination of materials, it is necessary to establish a mass production technology of a heat exchange laminated structure which is excellent in weather resistance and can be used for a long time.

[0009]

In order to solve the above-mentioned problems, a heat exchange laminated structure according to the present invention comprises a base material forming a heat exchange surface and a lyophilic or lyophilic layer laminated on the surface of the base material. Using a liquid-absorbing intermediate material and a laterally-spaced liquid-repellent strip-like coating layer that coats the surface of this intermediate material in a strip shape in the downward direction of the heating medium liquid. It is configured. The base material, the intermediate material and the strip coating layer are laminated on each other, and the intermediate material is adhered to the surface of the base material to form the liquid retaining lower surface, and the strip coating layer forms the lower liquid retaining lower surface. It is sandwiched between the base material and is welded to the surface of the base material through the liquid-retentive flow lower surface in the thickness direction of the sheet body, and the exposed liquid-retentive flow lower surface adjacent to the strip-shaped coating layer is the heat carrier liquid. And the liquid-repellent strip-shaped coating layers located on both sides of these flow-down guide paths function as strip-shaped pressers that prevent separation of the flow-down guide paths, and at the same time, they separate from the flow-down guide paths. It forms a boundary area for the flow-down regulation that returns the heat transfer medium liquid that moves back to the original path.

[0010]

[Function] Since the lyophilic or liquid-absorbing intermediate material is surface-bonded to the surface of the base material which is the basic material of the heat exchange laminated structure, if the intermediate material shrinks, the shear resistance on the bonded surface is 2 Acts axially. Therefore, the contour shape of the peeling that occurs is generally circular in the initial stage of the peeling phenomenon. The strip-shaped coating layers are welded to the surface of the base material with the intermediate material sandwiched therebetween, and are symmetrically arranged on the left and right sides of the exposed intermediate material. Since the intermediate material is fixedly held on both sides, the peeling that occurs is limited to local ones, and the growth rate of peeling along the flow-down guide path is slow. If shrinkage is prioritized over swelling, slack due to peeling is eliminated. Since both sides are fixed and held parallel to the flow-down guide path, the slack of the intermediate material caused by peeling is extremely small in both the vertical and horizontal directions, and the slack material does not move. Even if the flow-down guide path is separated, it does not disturb the movement of the heat transfer medium liquid passing through this portion, and the regulation effect is still maintained. Even if a lot of peeling occurs due to long-term use and it is time to replace the sheet, the downflow restraint performance of the downflow guide path is maintained to the minimum required level, and it is possible to select a convenient replacement time. is there.

[0011]

EXAMPLES The heat exchange laminated structure of the present invention will be described in detail below by taking a downflow solar collector as an example. The structure shown in the figure has a liquid-retaining flow lower surface 2 for a heat medium liquid in which a lyophilic or liquid-absorbing intermediate material is laminated on the surface of a heat collector 1 which is a base material.
A part of the surface of the liquid retaining lower surface 2 is coated with a lyophobic strip coating layer 3, and the exposed liquid retaining lower surface not covered by the strip coating layer 3 guides the downward flow. The path 4 is formed.

The liquid retaining lower surface 2 is fixed by welding the strip coating layer 3 to the surface of the base material including the liquid retaining lower surface, and the exposed portion of the liquid retaining lower surface alone is heated. It constitutes a flow-down guide path for the medium liquid. The flow-down guide paths thus formed are attached to the front surface or the back surface of the base material and arranged at appropriate intervals.

In the example of FIG. 1, the flow-down guide path 4 is linear. In the example of FIG. 3, the downflow guide path forms an extension 5 on the side. The expansion portion 5 can be composed of, for example, a branch portion as illustrated. A large number of the expanded portions can be arranged in a multi-stage state, and the distal end portions of the respective expanded portions can be arranged so as to overlap the distal end portions of the lower expanded portions with respect to the adjacent flow-down guide paths.

The downflow guide path can be formed in the substrate using any method. For example, a silk screen printing method or a roller printing method is used, or a press process is used to raise or collapse the material around the downflow guide path by using these printing technologies and heating press molding technology together, and the downflow guide path is ridged. It is of course possible to form a groove or a groove. Accordingly, in the description herein, the terms "downflow guide path" and / or "expansion" also include the flow-down guide path and / or extension of a ridge or groove recess thus formed. Is.

In principle, a lyophilic material or a liquid-absorbing material is used in the flow-down guide path, and the criterion for determining the lyophilic or liquid-absorbing property is the physical property of the surface of the base material with respect to the heat carrier liquid.

[Brief description of drawings]

FIG. 1 is a plan view showing an example of a heat exchange laminated structure having a flow regulating performance of a heat carrier liquid according to the present invention.

2 is a cross-sectional view of the structure of FIG. 1 taken along line II-II.

FIG. 3 is a plan view showing another embodiment of the heat exchange laminated structure according to the present invention.

FIG. 4 is a cross-sectional view taken along the line III-HII of the substrate structure of FIG.

[Explanation of symbols]

1: Substrate, 2: Liquid retaining lower surface, 3: Strip coating layer, 4: Downflow guide path, 5: Expansion part

Claims (4)

[Claims] 1. A base material that forms a heat exchange surface, a lyophilic or liquid-absorbing intermediate material that is laminated on the surface of the base material, and a predetermined flow of a heat transfer medium liquid on the surface of the intermediate material. And a liquid-repellent strip-shaped coating layer which is laterally spaced and which covers the strip in the direction, and these base material, intermediate material and strip-shaped coating layer are laminated on each other, and the intermediate material is the base material. To form a liquid-retaining flow lower surface, and the strip-shaped coating layer sandwiches the lower liquid-retaining flow lower surface between the base material and the liquid-retaining liquid flow surface in the thickness direction of the sheet body. The exposed liquid-retaining lower surface, which is welded to the surface of the substrate through the lower surface and is adjacent to the strip-shaped coating layer, forms the flow-down guide paths for the heat transfer medium liquid, and the sparsely-flowing guide paths located on both sides of these flow-down guide paths are formed. Liquid strip coating The layer acts as a strip-shaped retainer for preventing separation of the flow-down guide path, and at the same time, forms a boundary area for flow-down regulation that returns the heat carrier liquid that moves out of the flow-down guide path to the original path, A heat exchange laminated structure having the ability to regulate the flow of a heat carrier liquid. 2. The heat exchange laminated structure having the flow regulation performance of the heat medium liquid according to claim 1, wherein the flow-down guide path is formed on the surface of one side of the base material. A heat exchange laminated structure with liquid flow regulation performance. 3. A heat exchange laminated structure having the flow regulation performance of a heat transfer medium according to claim 1, wherein the flow guide paths are formed on both front and back surfaces of the base material. A heat exchange laminated structure having the ability to regulate the flow of a heat carrier liquid. 4. The heat exchange laminated structure having the flow regulation performance of the heat transfer medium liquid according to claim 2 or 3, wherein the flow-down guide paths are laterally projecting at the side portions of these flow-down guide paths. And a branch-shaped expansion part that captures the heat medium liquid moving out of the downflow guide path and returns it to the downflow guide path. Structure.