JPS58104459A - Heating tank of water heater utilizing solar heat - Google Patents

Abstract

PURPOSE:To prevent the deformation of the titled heating tank due to empty heating by a method wherein a network of hollow water passages is formed in a light transmissive plate laid over the upper surface of the heating tank so that even when water in the heating tank is let out, it is stored in the network of water passages in the light transmissive plate. CONSTITUTION:The network 7 of hollow water passages is formed veritcally in the light transmissive plate 4 laid over the upper surface of a heating tank 2 and the upper end of the network 7 is made to open in the tank 2. Further, the lower end of one of the legs of a reverse U-shaped inlet pipe 8 arranged parallel to the network 7 is made to open in the heating tank 2 while the lower end of the other leg of the pipe 8 is connected to the lower end of the network 7. As a result, the water in the heating tank 2 circulates repeatedly due to natural convection such that it enters the pipe 8 from the lower part of the tank 2 due to insolation, flows upward through the network 7 of water passages and then returns to the upper part of the tank 2. In this case, when, for some reason or other, the water is let out of the tank 2, the water in the network 7 does not flow into the tank 2 since the reverse U-shaped inlet pie 8 is connected to the network 7 and such water serves to prevent the overheating of the tank 2.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention aims to prevent a heating tank from being deformed due to dry heating (receiving solar radiation without water in the heating tank) in a solar water heater.

As shown in Figure 4, in a solar water heater that uses sunlight to heat water that enters a heating tank (2) from a distillation tank (1), a pipe (3) is inserted into the lower part of the water heater to draw hot water from this or drain water. If the heating tank (2) is made of synthetic resin or other heat-resistant materials, it may cause damage or deformation. It became.

The present invention seeks to eliminate the above drawbacks.

The present invention will be explained below based on an embodiment shown in FIGS. 1 to 3.

The heating tank (2) consists of a rectangular box with a translucent plate (4) stretched over its upper surface.

The translucent plate (4) has a hollow waterway network (7) extending vertically.
) are arranged in parallel.

Inverted U-shaped inflow pipes (8) are arranged side by side in this waterway network (7), one lower end of the inflow pipe (8) opens into the heating tank (2), and the other lower end opens into the waterway network ( 7) is connected to the bottom end.

The upper end of the channel network (7) opens into the heating tank (2).

This heating tank (2) is similar to the conventional example in that it is housed in a heat-retaining case covered with a heat insulating material, and that a pipe or the like (as shown) for hot water sampling or drainage is attached.

The water stored in the heating tank (2) enters the inflow pipe (8) from the bottom of the heating tank (2) due to solar radiation and flows into the waterway network (7).
) rises to the heating tank (2) and returns to the top of the mountain, repeating natural convection. Therefore, excessively heated water does not accumulate in the waterway network (7).

On the other hand, even if the water in the heating tank (2) drains for some reason, the inverted U-shaped inflow pipe (8) is connected to the waterway network (7), The water will not drain into the heating tank (2).

As shown in the above, in this invention, even if the water in the heating tank (2) has drained out, the water is stored in the channel network (7) of the translucent plate (4), so that this water can be removed. This prevents the heating tank (2) from becoming too hot. Since this water circulates within the heating tank (2) as described above, it does not affect the heat collection effect of the solar water heater.

[Brief Description of the Drawings] Figures 1 to 3 are views showing an embodiment of the present invention, in which Figure 1 is a perspective view, Figure 2 is a sectional view, Figure 3 is a plan view, and Figure 4 is a perspective view.
The figure is a sectional view showing a conventional example. Figure 7 Figure 2 i-■-

Claims (1)

[Claims] (1) A translucent plate is stretched on the upper surface, and a hollow waterway network extending vertically is formed on the translucent plate, the upper end of the waterway network is opened into the heating tank, and the waterway network is shaped like an inverted U. A heating tank for a solar water heater, comprising two type inlet pipes arranged in parallel, one lower end of which opens into the heating tank, and the other lower end connected to the lower end of a waterway network.