JPS58115258A - Solar heat collecting device - Google Patents

Abstract

PURPOSE:To prevent a heat collecting plate from extraordinary rise in temperature due to the heating without water by a method wherein a heat collecting plate formed freely liftable is provided at downward of a sun light permeable body, and the heat collecting plate is automatically ascended and descended by the operation of a temperature detecting element. CONSTITUTION:A heat collecting pipe 2 in a heat collector having a sun light permeable body 1 on a upper surface of said body 1 is formed as freely liftable, while, a bimetal 9 as temperature detecting element is contacted on a part of under-surface of the heat collecting plate 2. At an operation, a heating medium 6 is introduced into the heat collecting plate 2 through an inlet port 5, exhausted from a outlet port 7 after heated by solar heat. In this state, the temperature of the heat collecting plate 2 and surrounding atmosphere of said plate 2 is made lower than 100 deg.C, consequently, the bimetal 9 is not operated. Meanwhile, when the heating without water is performed, said plate 2 is risen extraordinary in temperature by the sunshine because the heating medium 6 is not filled up inside of the heat collecting plate 2. Thereby, said plate 2 is pushed up due to the expansion of the bimetal 9, the heat of said plate 2 is dissipated through the light permeable body 1, accordingly, said plate 2 is lowered in temperature.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a solar heat collector, and its purpose is to prevent an abnormal rise in temperature due to dry firing.

As shown in Figure 1, a conventional solar heat collector consists of a transparent body (1) that transmits sunlight, a heat collecting plate (2) that is located below the transparent body (1) and absorbs solar heat, and a heat collecting plate. (2) consists of a heat insulating material (3) and an outer frame (4) as basic members to prevent heat loss from the heat medium (6). ) flows in, and this heat medium (6) is transferred to the heat collecting plate (2).
After absorbing heat, the heat medium flows out from the outlet (7).

According to this configuration, when the heat collecting plate (2) is not filled with the heat medium (6), for example, when the heat collecting type mounting is installed, or when there is sunlight when not in use, the heat collecting plate (2) temperature rises rapidly. If the temperature of the heat collecting plate (2) rises, the temperature of the heat collecting plate (2) increases.
) is heated. If the heat insulating material (3) is inorganic (for example, Grasslar/I/), gas will be generated, and the gas will turn into white powder and become the transparent material (
It adheres to the inner surface of the transparent body (1) and reduces the amount of sunlight transmitted through the transparent body (1), making it impossible to efficiently collect heat and spoiling the aesthetic appearance. In addition, the insulation material (3) is made of organic foam (
For example, if the insulation material (3) is made of urethane, it will undergo secondary foaming and become permanently deformed, impairing its insulation performance. There were problems such as destroying (2).

The present invention was made in order to solve such conventional problems, and an object of the present invention is to suppress the temperature rise of the heat insulating material during dry firing of the solar heat collector. In order to achieve this object, the present invention allows the heat collecting plate to be moved up and down, and is provided with a salinity detector groove that is brought into contact with a part of the lower surface of the heat collecting plate and expands and contracts depending on the salinity. With this configuration, when the heat collection plate is air-baked and the temperature suddenly rises (over 100℃), the salinity detection mechanism detects the salinity of the heat collection plate and the ambient temperature of the heat collection plate, and expands and pushes the heat collecting plate upward, which increases the amount of heat dissipated by conduction from the heat collecting plate through the transparent body and lowers the temperature of the heat collecting plate. Furthermore, when the heat collecting plate is pushed upward, a space is created between the heat collecting plate and the heat insulating material, which reduces heat conduction from the heat collecting board to the heat insulating material, and it is possible to suppress the salinity of the heat insulating material to a low level. Conversely, when the heat collecting plate or the heat collecting plate ambient temperature becomes low (below 1'OO℃), the temperature detection mechanism contracts, and the heat collecting plate descends accordingly and comes into contact with the heat insulating material, reducing its insulation performance. It is maintained.

An embodiment of the present invention 1 will be described below with reference to FIGS. 2 and 8. Note that the same reference numerals as in the conventional example shown in FIG. 1 indicate the same members. In the figure, (9) is made of bimetal and is in contact with a part of the lower surface (both sides in the figure) of the heat collecting plate (2). The heat collecting plate (2) can be moved up and down. Figure 2 shows the state during actual heat collection, in which a heat medium (6) flows into the heat collection plate (2) through the heat medium inlet (5), and this heat medium (6) After being heated by the heat collecting plate (2), the heat medium is discharged from the heat medium outlet (7). In this state, the salinity of the heat collecting plate (2) and the atmosphere near the heat collecting plate (2) is below 100°C, and the bimetal (9) does not operate.

Next, when dry baking, use the heat collecting plate (2) as shown in Figure 8.
The inside is not filled with heat medium (6), and when there is sunlight, the salinity of the heat collecting plate (2) increases rapidly. If the temperature of the heat collecting plate (2) rises, the temperature of the heat collecting plate (2) also rises,
From around 100°C, pymetal/l' (9) becomes transparent material (1
), that is, in a direction that pushes up the heat collecting plate (2).

As Pymetal/L/ (9) expands, the heat collecting plate (2) is pushed upward and comes close to the transparent body (1). As a result, the heat dissipated by conduction from the heat collecting plate (2) through the transparent body (1) is increased.
2) The temperature also decreases. Also, when the heat collector plate (2) is pushed upward, a space 00 is created between the heat collector plate (2) and the heat insulator (3), and heat is transferred from the heat collector plate (2) to the heat insulator (3). Conduction is reduced, and the salinity of the heat insulating material (3) can be kept low. Conversely, when the temperature of the heat collecting plate (2) or the ambient temperature of the heat collecting plate (2) becomes low (100°C or less), for example, the heat medium (6) flows into the heat collecting plate (2). When there is no solar radiation, pimetal/l/ (9) contracts,
As the heat collecting plate (2) descends, it comes into contact with the heat insulating material (3) as shown in FIG. 2, and the heat insulating performance is maintained. In this way, Pymetal/l/ (0) expands and contracts depending on the temperature of the heat collecting plate (2) or the ambient temperature of the heat collecting plate (2), and the heat collecting plate (2) rises and falls accordingly. In addition to suppressing the change in salinity of the heat collecting plate (2) during dry baking, the heat insulating material (3)
It also prevents temperature rise. Therefore, if the heat insulating material (3) is inorganic (for example, Glasslar/I/), gas will not be generated, heat can be collected efficiently, and the appearance will not be spoiled. In addition, if the heat insulating material (3) is made of an organic foam (for example, urethane), there will be no secondary foaming of the insulating material (3), which will impair the adiabatic stirring performance, and a heat collecting plate due to the secondary foaming. There is no destruction of (2).

As described above, according to the solar heat collector of the present invention, the heat collecting plate can be raised and lowered freely, and the temperature detection mechanism (in the embodiment, a bimetallic ), even if the heat collecting plate is air-baked and the salinity rises rapidly, the temperature detection mechanism itself will be tensioned by detecting the temperature of the heat collecting plate or the ambient temperature of the heat collecting plate, and the temperature will not be collected. The temperature of the heat collecting plate can be lowered by pushing the heat plate upward and increasing heat dissipation through conduction from the heat collecting plate. Furthermore, since a space is created between the heat collecting plate and the heat insulating material, it is possible to prevent the temperature of the heat insulating material from rising.

Therefore, if the heat insulating material is inorganic (for example, Glasler/L/), it will not generate gas, can efficiently collect heat, and will not spoil the aesthetics. Further, if the heat insulating material is an organic foam (for example, urethane), there will be no secondary foaming of the heat insulating material, and the heat insulating performance will not be impaired and the heat collecting plate will not be destroyed due to the secondary foaming. Furthermore, since the abnormal temperature rise of the heat collecting plate can be suppressed, there will be no discoloration of the heat collecting plate surface, and if the heat collecting plate has a selective absorption film, it will not accelerate the deterioration of the film. If the temperature detection mechanism is made of bimetal, bellows, etc., costs can be reduced.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a conventional example, and FIGS. 2 and 3 are sectional views showing states during heat collection and dry firing in an embodiment of the present invention. (1)... Transmissive body, (2)... Heat collecting plate, (3)...
・Insulating material, (4)...outer frame, (5)...heating medium inlet, (6)...heating medium, (7)...heating medium outlet, (9)
···bimetal. Agent Yoshihiro Morimoto

Claims (1)

[Claims] 1. A transmitting body that transmits sunlight, a heat collecting plate located below the transmitting body and absorbing solar heat, and a heat insulating material provided below the heat collecting plate; The heat collecting plate can be raised and lowered freely,
A solar heat collector equipped with a temperature detection mechanism that expands and contracts depending on the temperature by making contact with a part of the bottom surface of the heat collector plate. 2. The solar heat collector according to claim 1, wherein the temperature sensing element is made of bimetal.