JPH081335B2 - Hot water storage system - Google Patents

Description

TECHNICAL FIELD The present invention relates to a hot water storage type hot water supply device having an expanded water treatment function.

2. Description of the Related Art Conventionally, in a hot water storage type hot water supply apparatus, it has been configured that the expanded water generated during heating is difficult to treat, and overflows from the hot water storage portion by an expansion amount and drains from the tip of the faucet.

A conventional hot water storage type hot water supply apparatus will be described below with reference to the drawings.

FIG. 7 shows the internal structure of a conventional hot water storage type water heater.

In FIG. 7, 2 is a heater fixed to the hot water storage tank 1, which heats the water in the hot water storage tank 1, 3 is a water shutoff valve for supplying / stopping water to the hot water storage tank 1, and 4 is a water shutoff valve. Water valve 3
This is a mixing valve that adjusts the hot water discharge temperature by distributing and adjusting the water supplied by the water supply to the hot water storage tank 1 and the secondary water supply.

13 is a drain valve for draining water in the hot water storage tank 1 and the mixing valve 4, 10 is a hot water supply pipe which is a flow path of mixed water of hot water and secondary water supply, and 11 is a faucet connected to the tip of the hot water supply pipe 10. Is.

The operation of the hot water storage type hot water supply device configured as described above will be described below.

First, when the hot and cold water stop valve 3 is opened to supply water into the hot water storage tank 1 through the mixing valve 4 and the hot water storage tank 1 becomes full, water comes out from the faucet 11 through the hot water supply pipe 10. . Then, by closing the water shutoff valve 3, the water supply is stopped and the water in the hot water storage tank 1 is kept constant. Then, the water in the hot water storage tank 1 is boiled by the heater 2.

Further, by operating the mixing valve 4 during water supply, the distribution ratio between the amount of water supplied to the hot water storage tank 1 and the amount of secondary water supply is changed,
Adjust the temperature of the mixed water from 11 The water distributed to the hot water storage tank 1 by the mixing valve 4 enters from the lower part of the hot water storage tank 1 and pushes up the hot water in the hot water storage tank 1,
Hot water comes out from the top. On the other hand, the water distributed as the secondary water supply by the mixing valve 4 is mixed with the hot water coming out of the hot water storage tank 1 in the upper part of the hot water storage tank 1, and the faucet via the hot water supply pipe 10.
Hot water of appropriate temperature is supplied from 11.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the above-mentioned configuration, when the water in the hot water storage tank 1 is heated when the heater 2 is heated in a full water state, thermal expansion occurs, and the generated expanded water is generated. Since it overflows from the hot water storage tank 1 and drips from the faucet 11 through the hot water supply pipe 10, it is unsightly to wet the surrounding area. Further, the dropping sound of the expanded water on the sink gives a loud and unpleasant feeling. Further, even if the water is stopped, the dripping continues, so that there is a problem that it is mistaken as a water leakage failure. Also, in the winter, this expanded water is the faucet.
Freezing at the tip of 11 causes the faucet 11 to become clogged and is in a stop state, and the hot water storage tank 1 receives high pressure due to thermal expansion of water, and when the stop water valve 3 is opened in the stop state, high water supply pressure is received. There was a problem that the hot water storage tank 1 was destroyed. Furthermore, since the portion of the hot water storage tank 1 where the temperature is highest, that is, the water at the uppermost portion of the hot water storage tank 1, is discharged as expanded water, there is a problem that the heating efficiency decreases and it is not suitable for energy saving. It was Furthermore, water stains and dirt easily accumulate in the hot water storage tank 1, and the drain valve 13
There was also a problem of having to open and drain water.

In view of the above problems, the present invention eliminates dripping of expanded water from the faucet, prevents destruction of the hot water storage tank due to freezing of the faucet, and at the same time has a high heating efficiency and automatically performs regular cleaning work. A hot water storage type hot water supply device is provided.

Means for Solving the Problems In order to solve the above-mentioned problems, a hot water storage type hot water supply apparatus of the present invention is a first detection apparatus for detecting whether the first valve apparatus for supplying / stopping water to / from the hot water storage section is opened or closed. And a second detection device for detecting expansion of water in the hot water storage unit, a control device for processing signals of these detection devices and controlling operation, and draining of the hot water storage unit by an operation signal from the control device. The second valve device is provided.

By the present invention having the above-mentioned configuration, the volume expansion of water generated by heating is drained from the bottom of the hot water storage part, which is the most difficult to be heated and is apt to accumulate water stains and dirt. It is possible to prevent the expansion water from overflowing from the hot water supply port without discharging the water to the outside, and it is also possible to periodically discharge water stains and dirt in the hot water storage part. Therefore, it is possible to eliminate the outflow of expanded water from the faucet during heating, and at the same time prevent the pressure breakdown of the hot water storage part due to the freezing of the faucet part in the winter, and further boil the heat of the heating device without waste. Can be used for high efficiency boiling. or,
Regular hot cleaning of hot water storage is unnecessary, and clean hot water can be supplied.

Embodiment A hot water storage type hot water supply apparatus according to a first embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

In the figure, 2 is a heater (also referred to as a heating device) fixed to the hot water storage tank 1 for heating water in the hot water storage tank 1 (also referred to as a hot water storage portion), and 3 is water supply to the hot water storage tank 1. A water shutoff valve (also referred to as a first valve device) for shutting off water, a mixing valve 4 for adjusting the amount of water supplied to the hot water storage tank 1 and a secondary water supply for adjusting the hot water discharge temperature, and 5 for hot water storage It is an electric drainage valve (also referred to as a second valve device) for draining water in the tank 1 and the mixing valve 4. 6 is a high water level detector that detects the volume expansion 15 of the water in the hot water storage tank 1 (also referred to as a second detection device), and 7 is a low level detector 17 that keeps the amount of water in the hot water storage tank 1 constant. A water level detector (also referred to as a third detection device), 8 is an open / closed detector (also referred to as a first detection device) that detects whether the water shutoff valve 3 is opened or closed, and 9 is each detector. A controller for controlling the operations 16 and 18 of the electric drain valve 5 by the signals of 6, 7 and 8 (note that
It is also called a control device). 10 is a hot water supply pipe through which the mixed water of the hot water from the hot water storage tank 1 and the water of the secondary supply water flows,
11 is a faucet connected to the tip of the hot water supply pipe 10.

The operation of the hot water storage type hot water supply device configured as described above will be described below.

First, referring to FIG. 1 and FIG. 2, when the hot water storage tank 1 is filled with water and the water supply stop valve 3 is closed to stop the water supply to the hot water storage tank 1, the open / close detector 8 Detects that the water stop valve 3 is closed 14 and that the high water level detector 6 has detected that the water level has reached the height of the high water level detector 6, 15 and opens the electric drain valve 5 by the controller 9. An operation 16 signal is sent, the electric drain valve 5 is opened, and the water in the bottom of the hot water storage tank 1 is drained. Next, when the low water level detector 7 detects that the water level has dropped below the height of the low water level detector 7 during this drainage state 17, the controller 9 sends a signal 18 for the closing operation to the electric drain valve 5. The electric drain valve 5 is closed and the drainage is stopped, so that the water in the hot water storage tank 1 is maintained at the low water level detector 7. Also, like this, the hot water storage tank 1
Since the water stop valve 3 is closed when the water inside is kept constant, the open / close detector 8 detects 14 that the water stop valve 3 is closed. When the heater 2 is energized in this state, the water level in the hot water storage tank 1 rises due to thermal expansion, and the high water level detector 6 detects again that the water level has reached the height of the high water level detector 6. Then, the controller 9 sends a signal of the opening operation 16 to the electric drain valve 5, the electric drain valve 5 is opened, and the water in the inner bottom portion of the hot water storage tank 1 is drained. When the low water level detector 7 detects that the water level has fallen below the low water level detector 7 due to the drainage, 17
Based on this detection 17 signal and the closed state detection 14 signal of the open / close detector 8, the controller 9 sends a closing operation 18 signal to the electric drain valve 5, and the electric drain valve 5 is closed to stop draining. After this, the water shutoff valve 3 is opened and the open / close detector 8 opens the water shutoff valve 3.
If the water level reaches the position of the high water level detector 6, the drainage operation 16 is performed, and if the water level falls below the position of the low water level detector 7, the electric drain valve 5 is closed and the drainage is stopped unless the open state is detected. The operation 18 of doing is repeated.

As described above, according to the present embodiment, the low water level detector 7 is provided above the hot water storage tank 1, and the high water level detector 6 is provided above the hot water storage tank 1, and the open / close detector that detects whether the water shutoff valve 3 is open / closed 14 is provided. 8, and by providing the electric drain valve 5 and the controller 9,
Since the expansion water generated by heating can be discharged from the bottom of the hot water storage tank 1 by the expansion amount, the expansion water can be prevented from flowing out from the faucet 11. Figure 3 shows the hot water storage tank 1 when boiling
FIG. 4 shows the distribution of the temperature of the inner hot water, showing that Example A is boiling up to the bottom of the hot water storage tank 1 as compared with Conventional Example B, and FIG. 4 shows that the amount of expanded water is discharged from the bottom of the hot water storage tank 1 to generate heat. The difference d in the heat loss amount between Example A and Conventional Example B due to the prevention of the outflow of the absorbed expanded water is shown. In other words, the line a indicates the theoretical heating amount, the line b indicates the heat amount of the hot water in the hot water storage tank 1 according to this embodiment, and the line c indicates the heat amount of the hot water in the hot water storage tank 1 according to the conventional example B. . Therefore, the shaded portion d between the line b and the line c shows the difference in the amount of heat loss due to the outflow of the expanded water between the present Example A and the Conventional Example B.

The second embodiment of the present invention will be described below with reference to FIGS.

In the figure, the difference from FIG. 1 which is the first embodiment is that the water level detector is only the high water level detector 6 (also referred to as the second detection device), and the controller 9 (also referred to as the control device). ) Is provided with a timer circuit 12 (also referred to as a third detection device), and the low water level detector 7 in the first embodiment is provided.
The operation 18 of the electric drainage valve 3 (which is also referred to as the second valve device) by the detection 17 signal is detected by the timer circuit 12 and the opening operation of the electric drainage valve 5 by the detection 19 signal is performed for 18 hours. As a result, it is clear that the same effect as the first embodiment can be obtained.

EFFECTS OF THE INVENTION As described above, according to the present invention, the first valve device for supplying / stopping water to the hot water storage part and the first valve device for detecting whether the first valve device is opened or closed are provided.
A detection device, a second valve device that drains water in the hot water storage unit, a second detection device that detects expansion of water in the hot water storage unit, and a control device that controls the operation of the second valve device by the signal of each detection device. The following effects can be obtained by installing them.

(1) Since only the water at the bottom of the hot water storage part is drained by the amount of expanded water while the hot water at the top of the heated hot water storage part remains, it is possible to boil with high heating efficiency with less heat loss, thus saving energy. The effect is obtained.

(2) Since the expanded water is drained from the second valve device, there is no drop from the faucet, and there is no discomfort with sound or drop.

(3) Since the expansion water does not flow out from the faucet, it is possible to prevent the pressure breakdown of the hot water storage part due to the freezing of the faucet part in winter.

[Brief description of drawings]

FIG. 1 is an internal configuration diagram of a hot water storage type hot water supply apparatus according to the first embodiment of the present invention, and FIG. 2 is a control sequence diagram of the same embodiment.
FIG. 3 is a hot water temperature distribution diagram in the hot water storage tank of the same embodiment and the conventional example,
FIG. 4 is a relationship diagram showing a difference in heat loss amount between the same embodiment and a conventional example, FIG. 5 is an internal configuration diagram in a second embodiment of the present invention, FIG. 6 is a control sequence diagram of the same embodiment, FIG. 7 is an internal configuration diagram of a conventional hot water storage type hot water supply device. 1 ... Hot water storage tank (hot water storage part), 2 ... Heater (heating device), 3 ... Water shutoff valve (first valve device), 5 ... Electric drainage valve (second valve device), 6 ... High water level detector (second detection device), 7,12 ... Third detection device (low water level detector, timer circuit), 8 ... Open / close detector (first detection device), 9 ... Controller (control) apparatus).

Claims (3)

[Claims] 1. A hot water storage unit having a heating device, a second valve device for draining water in the hot water storage unit, and a second detection device for detecting volume expansion of water in the hot water storage unit are provided. A hot water storage type hot water supply apparatus provided with a control device for bringing the second valve device into an "open" state when the detection device detects a volume expansion of water in the hot water storage section. 2. The second valve device is provided with a control device that brings the "open" state when the first detecting device detects that the first valve device is in the "closed" state. The hot water storage type hot water supply device according to the item. 3. The hot water supply type hot water supply system according to claim 1, wherein the second valve device is provided with a control device which is brought into a “closed” state when the water level drop in the hot water storage part is detected by the third detection device. apparatus.