JPS6218929Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in water heaters, particularly water heaters that use antifreeze as a heat medium.

Conventionally, in so-called natural circulation water heaters, which consist of a heat collection box and a heat storage tank installed diagonally above the box, in which a heat medium is naturally circulated between the two, the heat storage tank is made of an expensive copper plate, and the heat medium is water was used. However, with this type of water heater, the water in the water heater must be drained in winter to prevent it from freezing in cold regions, and as a result, the lighter water heater may be blown away by strong winds, or the water may need to be refilled later. Because people forgot to do so, water was not supplied, and accidents were likely to occur, for example, when reheating the bath, the bath would run dry, causing damage to the bath pot. In addition, when the temperature rapidly drops due to radiation cooling, the antifreeze drain valve itself may freeze, or the valve may not operate due to blockage such as garbage, causing water to freeze and expand inside the collection box. There were also accidents in which heat medium circulation pipes were ruptured.

The present invention eliminates the above drawbacks and uses an antifreeze heat medium, so there is no need to discharge the heat medium even if the outside temperature drops, and therefore it can withstand strong winds and prevent accidents such as malfunctions and damage. The purpose of the present invention is to provide a water heater that is free from fear and has high heat storage efficiency.

An embodiment of the present invention will be described below based on the drawings.

In FIG. 1, the water heater of the present invention has a heat collection box 1 installed in a tilted state, and a heat storage tank 2 provided adjacent to the upper side of the heat collection box in the direction of tilt. The heat collection box 1 is a flat rectangular box made of steel plate coated with black paint, and there are multiple rows of circulation pipes 3 inside the box.
are stored side by side.

The heat storage tank 2 has a cubic shape made of steel plates, aluminum plates, etc., and has a double structure of an outer wall 21 and a heat insulating layer 22.
Each row of the circulation pipes 3 is opened into the tank.
Antifreeze liquid 4 is stored in these heat storage tank 2 and circulation pipe 3 in a state where it can thermally expand and conduct heat.

Further, a heat exchange pipe 5 is arranged in a meandering manner as a heat exchanger in the heat storage tank 2. As the heat exchanger, the heat exchange pipe 5 is connected to a water supply pipe system via a water supply pipe 5a, and the end of the drain pipe 5b is connected to a hot water supply equipment.

The antifreeze in the heat storage tank contains a large number of block-shaped containers 6 filled with latent heat storage materials made of hydrated compounds such as Cacl _{2.6H 2} O or Na ₂ SO _{4.IOH 2} O. There is.

This latent heat storage material causes an exothermic and endothermic reaction due to temperature changes. That is, for example, in the case of Cacl _{2.6H 2} O,
The reaction takes place at 38°C as follows.

Therefore, the antifreeze in the heat collection box 1 whose temperature has been raised by receiving solar heat expands thermally and reaches the heat storage tank 2 via the circulation pipe 3. Therefore, when the temperature of the hydrated compound in the heat storage tank 2 is heated to 38°C or higher due to heat absorption,
The hydrated compound decomposes and Cacl ₂ and water are separated. Next, when solar heat decreases and the temperature of the antifreeze drops below 38° C. as the outside temperature falls, Cacl ₂ and water combine to cause an exothermic reaction. This heat generation causes the heat to be returned to the antifreeze solution, thereby suppressing a decrease in the temperature of the antifreeze solution 4. And this warmed antifreeze 4
The water passing through the heat exchange pipe 5 meandering inside is heated.

Since the antifreeze liquid 4 is stored in the circulation pipe 3 and the heat storage tank 2, the antifreeze liquid does not freeze even if the temperature suddenly drops in a cold region in winter, and as a result, accidents such as the circulation pipe 3 bursting occur. There's nothing to do. In addition, the inside of the heat storage tank 2 is maintained at a minimum temperature of 38° C. under normal conditions by the operation of the latent heat storage material, and the heat storage efficiency is high.

FIG. 2 shows another embodiment in which a plurality of closed hot water storage tanks 51 are provided in the middle of the heat exchange pipe 5 in the heat storage tank 2. According to this, a certain amount of hot water can be stored, enough hot water is heated and retained for washing the sink, hands, etc., and the heat exchange efficiency is also good.

In addition, FIG. 3 shows a heat exchange pipe 5 in the heat storage tank 2.
This is a third embodiment in which a relay tank 52 is provided at the inlet of the tank, and a ball tap 7 is attached to the relay tank.
According to this embodiment, when the hot water in the heat exchange pipe 5 is used, the ball tap 7 opens to replenish tap water. Then, the amount of water in the heat exchange pipe 5 and the relay tank 52 is always kept constant.

Furthermore, although not shown, the structures of the second and third embodiments are combined, and in the heat storage tank, a closed hot water storage tank 51 is provided in the middle of the heat exchange pipe 5, and a relay tank 52 is provided at the entrance of the heat exchange pipe 5. may be provided.

Since the present invention is constructed as described above, even if the outside temperature drops in winter in cold regions, there is no need to remove the heat medium from the water heater, and therefore the water heater can be used without being blown away by strong winds. There is no possibility of damage due to malfunctions or human troubles related to other accessories. In addition, the heat storage tank has a high heat storage efficiency, and cheaper materials can be used for the heat storage tank compared to conventional ones, helping to reduce the overall cost of the water heater.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway perspective view showing one embodiment of the present invention, Fig. 2 is a perspective view of another embodiment, and Fig. 3 is a perspective view of a third embodiment of the present invention.
It is a perspective view of an example. 1... Heat collection box, 2... Heat storage tank, 3... Circulation pipe, 4... Antifreeze, 5... Heat exchange pipe, 51
... Sealed hot water storage tank, 52 ... Relay tank, 6
...Block-shaped container, 7...Ball tap.

Claims (1)

[Claims for Utility Model Registration] (1) In a natural circulation water heater, antifreeze is used as a heat medium, and a heat storage tank accommodates a large number of block-shaped containers in which latent heat storage material is sealed in the antifreeze. In addition, a water heater characterized in that heat exchange pipes connected to a water pipe system are arranged in a meandering manner. (2) The water heater according to claim 1 of the utility model registration claim, which has a plurality of closed hot water storage tanks disposed in the middle of a heat exchange pipe. (3) The water heater according to claim 1, wherein a relay tank equipped with a ball tap is provided at the inlet of the heat exchange pipe. (4) The water heater according to claim 1, wherein the heat exchange pipe is provided with a closed hot water storage tank and a relay tank with a ball tap.