JPS5844173B2 - water heater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hot water storage type water heater, in which when the amount of hot water in the hot water storage tank becomes insufficient than a predetermined amount, the water in the water tank is automatically converted to boiling water and then sent to the hot water storage tank. This system is designed to ensure that the amount of hot water in the hot water storage tank is always maintained at a predetermined amount.

In conventional water heaters, when the hot water in the hot water storage tank became less than a predetermined amount, some water heaters automatically supplied the insufficient amount of water from outside. The temperature of the hot water in the hot water tank once drops due to the supply of hot water, and then it is heated to a predetermined temperature using a heating source, so the drawback is that it is not possible to take out the necessary amount of hot water when needed. There was.

The present invention has been devised to eliminate the above-mentioned drawbacks and will be explained in detail below with reference to an embodiment shown in the drawings.

1 and 2, the water heater is roughly divided into a main body 1, a water supply tank 2, and a hot water storage tank 3, and both tanks 2 and 3 are provided with cover plates 4 and 5 on their upper surfaces.

Both the tanks 2 and 3 are mounted on the upper surface of the main body 1, and the hot water storage tank 3 is mounted via a base 6.

The main body 1 is equipped with a heating section 7 that heats water to turn it into hot water, and this heating section 7 is composed of a heating pipe (10 mmφ) and a heater 9 that heats the pipe.

The heating pipe 8 is equipped with a hot water supply pipe 10 and a return pipe 11 at both ends, and water is heated in the heating pipe 8 and a part of the water is evaporated, and the steam is transferred from the hot water supply pipe 10 into the hot water storage tank 3. Hot water is forced out.

Further, both the pipes 10 and 11 extend upwardly to the base 6.
is inserted into the hot water storage tank 3.

In the hot water storage tank 3, the return pipe 11 opens above the hot water supply pipe 10, and the return pipe 1
The hot water level of the hot water storage tank 3, that is, the amount of hot water stored, is determined by the opening position of the hot water tank 1.

The water supply passage 12 leads the water in the water supply tank 2 to the heating pipe 8, and includes a branch pipe 13 that branches from the heating pipe 8 side end of the return pipe 11, and a water supply pipe whose one end extends into the water supply tank 2. 14 and a connecting pipe 15 that brings both pipes 13 and 14 into communication.

A check valve 16 is installed in the connecting pipe 15, and this check valve 16 is connected to the branch pipe 1 from the water supply pipe 14 side.
Allows flow in only three directions and prevents reverse flow.

Therefore, the open end of the branch pipe 13 is formed in a shape that will not be closed by the check valve 16, and the open end of the water supply pipe 14 is formed in a shape that can be closed by the check valve 16.

The thermostat 17 is a normally closed type and is connected in series to the heater 9, and is arranged in the base 6 to sense the temperature of the hot water filling the pipe 11 via the return pipe 11. Open.

Therefore, in order for the thermostat 17 to quickly sense the temperature of the hot water in the return pipe 11, it is preferable to form the return pipe 11 with a thin material having good thermal conductivity.

Note that 18 in the figure is a hot water tap for taking out the hot water in the hot water storage tank 3.

Next, its effect will be explained.

The water in the water supply tank 2 flows into the heating pipe 8 through the water supply passage 12 due to the head difference, and is heated here by the heater 9 to boil and turn into boiling water, with a portion turning into steam.

Due to the water vapor pressure at this time, the hot water in the heating pipe 8 is prevented from flowing back toward the water supply tank 2 by the check valve 16, so that it is pushed up along the hot water supply pipe 10 and stored in the storage tank 3.

When hot water enters the hot water storage tank 3 through the hot water supply pipe 10, the pressure inside the hot water supply pipe 10 is reduced by the amount of the hot water that has flowed in, and due to the reduced pressure, water flows from the water supply tank 2 into the heating pipe 8 via the check valve 16. Cold water flows in.

Therefore, although cold water is mixed in the hot water supply pipe 10, the amount is small, and since it is mixed with hot water and heated by the heater 9, it instantaneously becomes boiling water, a part of which becomes steam, and is transferred from the hot water supply pipe 10 to the hot water storage tank. Boil boiling water up to 10 ml.

By repeating this operation, hot water heated to high temperature by the heating section 7 is stored in the hot water storage tank 3, and when the surface of the stored hot water exceeds the upper open end of the return pipe 11, the hot water in the hot water storage tank 3 passes through the return pipe 11. After that, it returns to the heating pipe 8.

Incidentally, when the hot water is pushed up from the hot water pipe 10, some water vapor pressure also acts on the return pipe 11 side, but since the return pipe 11 opens at a position above the hot water pipe 10, the hot water is moved from the hot water pipe 10 to the hot water storage 3 first. Hot water is forced to the side.

When the temperature of the hot water in the hot water storage tank 3 rises to a predetermined temperature, the thermostat 17 opens according to the temperature of the hot water in the pipe 11 sensed via the return pipe 11 and cuts off the power to the heater 9.

Then, when the temperature of the hot water decreases, the thermostat 17
is closed again and heating by the heater 9 is restarted, and the hot water in the hot water storage tank 3 circulates through the return pipe 11°, the heating pipe 8, and the hot water supply pipe 10, and rises to a predetermined temperature.

By repeating such operations, the amount of hot water in the hot water storage tank 3 is maintained at a predetermined amount, and the temperature of the hot water is maintained at a predetermined temperature.

When the hot water level in the hot water storage tank 3 drops due to hot water taken out by the hot water tap 18 and the thermostat 17 closes and heating by the heater 9 is resumed, the hot water returns to the heating pipe 8 via the return pipe 11. Since there is no hot water, water in the water supply tank 2 flows into the heating pipe 8, raising the hot water level in the hot water storage tank 3 to a predetermined water level, and a predetermined amount of hot water is stored in the hot water storage tank 3.

As in the above embodiment, the return pipe 11 is made of a thin material with good thermal conductivity, and the thermostat N7 is provided to sense the temperature of the hot water inside the return pipe 11. When a pipe with a large hunting width is used, the temperature change of the hot water inside the return pipe 11 is wider than that on the hot water storage tank 3 side, so the temperature change of the hot water inside the hot water storage tank 3 can be suppressed to a small value.

3 and 4 show the other side of the heating section 7, and the heating tank 1
9 and the heater 9 constitute a heating section 7, and the open end 1 (y) of the hot water supply pipe 10 in the heating tank 19 is formed into a trumpet shape that widens downward.

Note that the thermostat 17 may be arranged to detect the temperature of hot water in the hot water storage tank 3, and the means for controlling the heater 9 is not limited to the thermostat 17, but may also be arranged to detect the temperature of hot water in the return pipe or the hot water storage tank. Any device that can control the heater 9 may be used.

Furthermore, the return pipe 11 in the Y-Y line section of FIG.
By providing a check valve in the hot water supply pipe 10, the effect of pushing up hot water from the heating unit 7 to the hot water storage tank 3 by the hot water supply pipe 10 can be increased.

According to the present invention configured as described above, when the hot water in the hot water storage tank is extracted and the amount of hot water in the tank becomes insufficient than a predetermined amount, the water in the water supply tank is turned into hot water and then pumped into the hot water storage tank. , a predetermined amount of hot water is automatically stored.

That is, hot water of a predetermined temperature and a predetermined amount can always be stored in the hot water storage tank, which is very excellent in practical use.

[Brief explanation of the drawing]

Fig. 1 is an external view of the device of the present invention, Fig. 2 is a longitudinal sectional view of the same, Fig. 3 is a longitudinal sectional view showing the other side of the heating section in the device, and Fig. 4 is a cross section taken along line AA in Fig. 3. It is a diagram. Main body, 2: Water supply tank, 3: Hot water storage tank, 7: Heating section, 9: Heater, 10: Hot water supply pipe, 11: Return pipe, 12: Water supply passage, 16: Check valve, 17: Thermostat, 18: Hot water supply plug.

Claims (1)

[Claims] 1. A water supply tank, a hot water storage tank, a main body on which both of the above tanks are mounted and a heating section inside, a water supply passageway that leads water in the water tank to the heating section through a check valve, and a water supply passageway that leads water from the heating section to the heating section. A hot water supply pipe that pushes hot water up into a tank using water vapor pressure that partially evaporates water; a return pipe that opens above the hot water supply pipe in the hot water storage tank and returns the hot water in the hot water storage tank to the heating section; and the return pipe. A water heater comprising: a temperature control means for controlling a heating section by sensing the temperature of hot water in a pipe; and a means for taking out the hot water from a hot water storage tank.