JPS6027315Y2 - Solar water heater - Google Patents

Description

[Detailed description of the invention] This invention is a solar water heater, specifically, a collector that absorbs solar heat and heats the water passing through it, and a hot water tank that stores the water heated by the collector and sends the water to the collector. , relates to a solar water heater equipped with a circulation pump that performs forced circulation of water between a collector and a hot water storage tank and stops water supply when the water temperature in the collector falls below the water temperature in the hot water storage tank.

Conventionally, in this type of solar water heater, as shown in Fig. 1, in order to prevent damage due to freezing of the parts of the collector 1 and the water circulation path 3 that are disposed outdoors, they are exposed to the outdoors. , the circulation path 3 is provided with an outside air introducing means 10 such as an air vent valve, an air vent pipe, a negative pressure differential valve, etc., and when the water temperature in the collector 1 becomes lower than the water temperature in the hot water storage tank 2, the circulation pump 4 When the water stops, outside air is introduced into the circulation path 3 to cause the water in the collector 1 to fall and return to the hot water storage tank 2.

On the other hand, since water is supplied to the hot water tank 2 by adjusting the water level using a pole tap 6, if water falls from the collector 1 and returns to the hot water tank 2 when the water level has already reached a predetermined level, the water is discharged to the outside of the hot water tank 2 through an overflow pipe 8.

By the way, the water in the circulation path 3 freezes only in winter in Japan, but the circulation pump 4 stops when the water temperature in the collector 1 drops below the water temperature in the hot water storage tank 2, so the water in the circulation path 3 freezes only in winter. 1, the water that falls is unrelated to the season.

In other words, even when there is no risk of the water in the circulation path 3 freezing, the water in the collector 1 falls and is discharged outside through the overflow pipe 8 provided in the hot water storage tank 2, causing the water to heat up. This has the disadvantage that the water used in the process has to be discarded, which reduces the efficiency of energy use.

The present invention was devised to eliminate such conventional drawbacks, and its purpose is to introduce outside air into the circulation path only when the conditions are such that the water in the circulation path freezes. An object of the present invention is to provide a solar water heater which discharges water in a collector.

Hereinafter, embodiments of the present invention will be described based on the drawings.

The solar water heater according to the present invention includes a collector 1 that absorbs solar heat, heats the water passing through it, and sends it out, and a collector 1 that is disposed at a lower place than the collector 1 and stores the water heated by the collector 1. A hot water storage tank 2 that sends water to the collector 1, a circulation pump 4 that is interposed in the circulation path 3 between the collector 1 and the hot water storage tank 2 and performs forced circulation in the circulation path 3, and a circulation pump 4 between the collector 1 and the hot water storage tank 2. An anti-freezing valve 5 is installed in the circulation path 3 between the circulation path 3 and opens only when the water temperature in the circulation path 3 falls below a predetermined value to introduce outside air into the circulation path 3, and is closed at other times. The circulation pump 4 stops when the water temperature in the collector 1 becomes lower than the water temperature in the hot water storage tank 2, and at this time, the circulation pump 4 stops.
If the water temperature in the collector 1 is below a predetermined value, the antifreeze valve 5 opens and the water in the collector 1 is discharged to the hot water tank 2 through the circulation path 3. An example is shown in which the water amount is adjusted using the pole tap 6 so that the water temperature is constant.

As shown in FIGS. 2 and 3, the collector 1 is connected to the hot water tank 2.
A circulation path 3 is formed between the collector 1 and the hot water storage tank 2.

A circulation pump 4 is disposed in the circulation path 3 to send water in the hot water storage tank 2 to the collector 1, and the collector 1 absorbs solar heat and heats the water and sends the water back to the hot water storage tank 2 again.

A pole tap 6 is provided in the hot water tank 2, and the amount of water stored in the hot water tank 2 through a water supply pipe 7 is adjusted to be constant.

In addition, an overflow pipe 8 is installed slightly above the standard water level regulated by the pole tap 6 of the hot water storage tank 2, and when the amount of water in the hot water storage tank 2 exceeds the standard water level, a part of the water is transferred to the outside. It is designed to be discharged.

An antifreeze valve 5 is provided in the circulation path 3 at a location higher than the water level where the overflow pipe 8 is provided.

The antifreeze valve 5 monitors the water temperature in the circulation path 3 and when the water temperature falls below a predetermined value, that is, the temperature at which the water in the circulation path 3 freezes, the valve opens to supply outside air to the circulation path 3. Normally, the valve is closed to prevent outside air from entering the circulation path 3.

Further, the circulation pump 4 compares the water temperatures in the collector 1 and the hot water storage tank 2, and stops water supply when the water temperature in the collector 1 becomes lower than the water temperature in the hot water storage tank 2.

That is, if the water temperature in the collector 1 is lower than the water temperature in the hot water storage tank 2, supplying water to the collector 1 will actually lower the water temperature in the hot water storage tank 2, so water supply is stopped.

By the way, when the water in the collector 1 installed outdoors drops to a freezing temperature in winter, the water temperature in the hot water storage tank 2 is higher than the water temperature in the collector 1, so the circulation pump 4 stops. At this time, the antifreeze valve 5 opens to introduce outside air into the circulation path 3, and the water in the collector 1 falls through the circulation path 3 and returns to the hot water storage tank 2.

In this way, when the water in the collector 1 is about to freeze, the water in the collector 1 is drained to prevent damage due to freezing, and on the other hand, even if the circulation pump stops during normal use, the water in the collector 1 remains intact. It is something that does not fall down as necessary.

As mentioned above, the present invention consists of a circulation pump that stops circulating water between the collector and the hot water tank when the water temperature in the collector drops below the water temperature in the hot water storage tank, and a circulation pump that stops the circulation of water between the collector and the hot water storage tank when the water temperature in the circulation path is below a predetermined value. Since the collector is equipped with an antifreeze valve that introduces outside air into the circulation path, water in the collector is much less likely to be drained compared to conventional collectors, and an overflow pipe is installed in the hot water storage tank as shown in the example. Even if the collector has a This has the advantage that it is possible to avoid abnormal temperature rise due to dry heating of the collector when the collector is removed, and deformation of the collector due to this is also prevented.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing a conventional example, FIG. 2 is a schematic diagram showing an embodiment of the present invention, and FIG. 3 is a schematic diagram showing another embodiment of the invention. 2 is a hot water tank, 3
4 is a circulation path, 4 is a circulation pump, and 5 is an antifreeze valve.

Claims (1)

[Scope of utility model registration request] A collector that absorbs solar heat and heats the water that passes through it before sending it out; a hot water tank that is located lower than the collector and stores the water heated by the collector and sends the water to the collector; the collector and the hot water storage tank. A circulation pump is installed in the circulation path between the collector and the hot water storage tank to perform forced circulation in the circulation path, and a circulation pump is installed in the circulation path between the collector and the hot water storage tank to ensure that the water temperature in the circulation path falls below a predetermined value. and an anti-freeze valve that opens only when the system is open to introduce outside air into the circulation path and closes at other times.
The circulation pump will stop when the water temperature in the collector drops below the water temperature in the hot water storage tank. At this time, if the water temperature in the circulation path is below a predetermined value, the antifreeze valve will open and the water in the collector will be discharged through the circulation path to the hot water storage tank. A solar water heater.