JPS5816107B2 - Flat solar heat exchanger - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a flat solar heat exchanger in which a heat absorption plate holds a heat absorption tube.

There are various usage conditions for heat exchangers, but solar heat exchangers differ fundamentally from other heat exchangers in that they absorb radiant heat.

Furthermore, since solar heat exchangers are usually installed on the rooftops of houses, etc., they must be lightweight.

Conventionally, solar heat exchangers have generally been made by brazing or welding a heat absorption tube made of a circular tube to a heat absorption plate made of a flat plate.

However, according to the conventional structure, the heat absorbed by the heat absorption plate cannot be efficiently transferred to the fluid in the heat absorption tube, that is, water.

Further, according to the conventional structure, if the heat absorption tube is made of a corrosion-resistant metal, there is a risk that the brazed or welded portion may be destroyed due to the difference in thermal expansion.

Furthermore, in the conventional structure, since the heat absorption tube is still a circular tube, the thickness of the heat exchanger is large, resulting in a poor heat exchange rate per volume.

On the other hand, a heat exchanger with a structure in which a flat heat sink is provided with a groove and a circular tube is inserted into the groove is also known, but when a heat exchanger with this known structure is converted to a solar heat exchanger , the thickness is large and the heat exchange rate is poor as described above.

Furthermore, there is also one in which two arcuate pieces are provided oppositely protruding from the plate surface to form a circular groove, and a transom tube is inserted into this groove to transform it into the circular shape of the groove. It is publicly known.

(USP No. 2823016) However, in this known technique, the transom tube is only transformed into a circular tube, so the gap between the concave groove and the circular tube becomes large, resulting in a low heat transfer coefficient. There is a risk of it becoming loose or falling off due to insufficient retention with the circular tube.

An object of the present invention is to provide a solar heat exchanger that improves the above-mentioned drawbacks.

Examples will be described below.

Referring to FIG. 1, a flat heat absorbing plate 3 is made of a thin metal rolled material 2 made of a thin pressed metal plate, and integrally has a concave groove 2 extending from the heat absorbing plate surface to one side over its entire length. is formed.

The shape of the concave groove 2 is a horizontally elongated in-field arc shape in the direction of the heat absorption plate 3, into which a heat absorption pipe 4 made of a metal different from the heat absorption plate 3 is press-fitted.

The entrance opening width of the groove 2 is smaller than the maximum width inside the groove 2.

The heat-absorbing tube 4 is a circular tube before being press-fitted, but after being press-fitted, it is deformed so as to be crushed in a direction perpendicular to the surface of the heat-absorbing plate.

The crushed heat absorbing tube 4 is deformed to match the cross-sectional shape of the groove 2, and the contact between the outer peripheral surface of the heat absorbing tube 4 and the inner surface of the groove 2 becomes reliable and strong over the entire surface.

The heat absorbing tube 4 is placed on the mouth 1 of the groove 2 and is normally deformed using a suitable die, etc., but the heat absorbing tube 4 and the heat absorbing plate 3 after deformation
It is desirable to have the same height.

This heat exchanger is used by applying heat rays to the back of the figure and applying heat insulating material to the top of the figure, but as mentioned above, by making the surface uniform, there is no space between the heat insulator and the heat. This makes it possible to reduce escape.

In the embodiment shown in FIG. 2, the concave groove 2 is flat, thereby achieving a higher heat exchange rate (and a reduction in size and weight).

Other symbols are the same as those in FIG. 1, so explanations will be omitted.

In the embodiment shown in FIG. 3, the groove 2 has an arc shape,
The heat absorbing tube 4 has a structure in which only the upper part of a circular tube is crushed.

Other symbols are the same as in FIG.

According to the present invention configured as described above, the following effects are achieved.

First, since the heat absorption tubes are deformed so as to be crushed, the thickness of the solar heat exchanger is reduced and the heat exchange efficiency per volume is improved.

Therefore, a small and lightweight heat exchanger can be obtained.

Furthermore, by deforming in a crushing manner, no space is created between it and the heat insulating material, resulting in less heat escaping.

In addition, the crushing deformation increases the contact pressure between the heat-absorbing tube and the heat-absorbing plate (that is, the gap becomes smaller), improving thermal conductivity and further reducing the size and weight.

In particular, according to the present invention, the groove deforms in the upper part of the groove so as to bite into the heat absorption tube, which improves the heat transfer rate and prevents rattling during transportation or long-term use. It does not occur and is durable.

Even if the heat-absorbing tube and the heat-absorbing plate are made of different metals, the structure is such that the heat-absorbing tube is fitted into the groove, so there is no risk of them falling off, only slipping within the groove.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway perspective view showing one embodiment of the present invention, and FIG.
The figure is a partially cutaway perspective view showing another embodiment of the invention, and FIG. 3 is a partially cutaway perspective view showing still another embodiment of the invention.

Claims (1)

[Claims] 1. A thin flat heat absorbing plate made of rolled metal material or pressed metal plate, and a circular arc shape that bulges out to one side from the heat absorbing plate surface and integrally extends over its entire length, or a transom arc shape that is horizontally elongated in the direction of the heat absorbing plate surface. The groove formed in the groove and the artificial opening width of the groove are smaller than the maximum inside of the groove, and the flat heat absorption plate is made of a circular pipe of a different metal, and is press-fitted into the groove. A flat solar heat exchanger comprising: a heat absorption tube which is deformed so as to be crushed in a direction perpendicular to the surface of a rear heat absorption plate, and is provided to fit the cross-sectional shape of the groove.