JPH0796970B2 - Hot water storage system - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to detection and control of expanded water of a hot water storage type hot water supply apparatus.

2. Description of the Related Art Conventionally, in a hot water storage type hot water supply apparatus, it is difficult to treat the expanded water generated at the time of heating, and the expanded water overflows from the hot water storage portion by an amount corresponding to the expanded water and is drained from the tip of the faucet.

Hereinafter, an example of a conventional hot water storage type hot water supply device will be described with reference to the drawings.

FIG. 3 shows the configuration of a conventional hot water storage type water heater.

In FIG. 3, 1 is a hot water storage tank, 2 is a heater which is fixed to the hot water storage tank 1 and heats water in the hot water storage tank 1, 3 is a water stop valve for supplying and stopping water to the hot water storage tank 1, Four
Is a mixing valve that adjusts the hot water temperature by distributing and adjusting the water supplied by the hot and cold water stop valve 3 to the hot water storage tank 1 and the secondary water supply. 11 is a drain valve for draining water in the hot water storage tank 1 and the mixing valve 4, 9 is a hot water supply pipe which is a flow path of mixed water of hot water and secondary water supply, and 10 is a faucet connected to the tip of the hot water supply pipe 9. 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 supply 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 10 through the hot water supply pipe 9. . 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, and the faucet 10
Adjust the temperature of the mixed water that comes out of. 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, pushes up the hot water in the hot water storage tank 1, and the hot water comes out of the upper part of the hot water storage tank 1. 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 at the upper part of the hot water storage tank 1 and the faucet 10 through the hot water supply pipe 9.
The hot water of appropriate temperature is supplied from.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the above configuration, when the hot water storage tank 1 is heated by the heater 2 in a full state, the hot water storage tank 1
The internal water causes thermal expansion, and the expanded water overflows from the hot water storage tank 1 and drips from the faucet 10 through the hot water supply pipe 9. Therefore, in the winter, the expanded water is frozen at the tip of the faucet 10 so that the faucet 10 is Since the hot water storage tank 1 is directly clogged with the hot water, the hot water storage tank 1 is directly subjected to the thermal expansion pressure of the water, or the hot water storage tank 1 is directly subjected to the tap water pressure by opening the water shutoff valve in the hot water storage state. There are problems that pressure breakdown occurs and glass lining cracks cause corrosion in the hot water storage tank.

In view of the above problems, the present invention provides a hot water storage type hot water supply device that prevents pressure breakdown of the hot water storage tank that is caused by the freezing of the faucet portion in a pre-stopped state in the winter when freezing occurs.

Means for Solving the Problems In order to solve the above problems, a hot water storage type hot water supply apparatus of the present invention includes a hot water storage unit having a heating device, and a first valve device for supplying and stopping water to the hot water storage unit. A first detection device that detects whether the first valve device is opened and closed, a second valve device that drains water in the hot water storage unit, and a second detection device that detects an environmental temperature, Water generated by heating the second valve device when the closing of the first valve device is detected by the first detecting device and the detection signal of the second detecting device becomes equal to or lower than a preset temperature. It is provided with a control device for keeping the open state only for the time of discharging the volume expansion amount.

Effect The present invention, by adopting the above configuration, when the environmental temperature is lowered to the freezing temperature as in the winter season, the volume expansion amount of water generated by heating is drained from the bottom of the hot water storage part,
Even during boiling, the expansion water does not always exceed the capacity of the hot water storage tank, the dripping of the expansion water from the faucet disappears, and the freezing of the expansion water at the faucet causes the pressure to stop in the hot water storage part. Can be prevented.

Examples Hereinafter, a hot water storage type hot water supply apparatus according to an embodiment of the present invention will be described with reference to the drawings.

In FIG. 1, 1 is a hot water storage tank, 2 is a heater fixed to the hot water storage tank 1 for heating water in the hot water storage tank 1,
3 is a water supply / stop valve for supplying / stopping water to / from the hot water storage tank 1, 4 is a mixing valve for adjusting the amount of water supplied to the hot water storage tank 1 and the amount of secondary water supply for adjusting the hot water discharge temperature, 5 is a hot water storage tank 1 and an electric drain valve for draining water in the mixing valve 4. 6
Is an outside air temperature detector for detecting the outside air temperature, and 7 is a water shutoff valve 3
Is an opening / closing operation detector for detecting the opening / closing operation, and 8 is a controller for controlling the opening / closing operation of the electric drain valve according to a signal from each detector. Reference numeral 9 is a hot water supply pipe through which mixed water of hot water from the hot water storage tank 1 and secondary water supply flows, and 10 is a faucet connected to the tip of the hot water supply pipe.

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

First, when the hot / cold water supply valve 3 is closed while the hot water storage tank 1 is full of water, water supply to the hot water storage tank 1 is stopped, and at the same time, the opening / closing motion detector 7 closes the hot / water shutoff valve 3. When the outside air temperature detector 6 detects a temperature equal to or lower than the set temperature, the controller 8 sends an opening operation signal to the electric drainage valve 5, and the electric drainage valve 5 can drain a volume of expansion water equivalent to the set time. Only in the open state, the water in the hot water storage tank 1 is drained.

Next, after this drainage state, when the set time has passed,
A closing operation signal is sent to the electric drain valve 5 by the controller 8,
The electric drain valve 5 is closed and drainage stops. At this time,
Although the water shutoff valve 3 is in the closed state, it is desired that the shutoff operation is not performed. Therefore, the state is continued as it is, and then the water shutoff valve 3 is again opened and closed. Valve 3
The drainage operation is not performed unless the outside air temperature detector 6 detects the closing temperature of the above and the outside temperature detector 6 detects the temperature below the set temperature. When the heater 2 is energized in this state, the water in the hot water storage tank 1 thermally expands and its volume increases, but the hot water overflows from the hot water storage tank 1 because the expanded water equivalent amount has already been drained. It never comes out.

As described above, according to the present embodiment, the opening / closing operation detector that detects the closing operation of the water shutoff valve, the outside air temperature detector, and the controller that processes the signal of each detector, and the signal of this controller. By providing the electric non-water valve that opens and closes by the above, it is possible to prevent the expansion water from dropping from the faucet due to heating, and prevent the faucet portion from freezing.

Although the outside air temperature detector 6 is used as the environmental temperature detector in the above embodiment, a temperature detector that detects the surface temperature of the faucet 11 may be used. Further, although the electric drain valve 5 is used, a mechanical drain valve may be used.

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 the opening / closing operation of the first valve device are provided.
And a second valve device for draining the water in the hot water storage unit, a second detection device for detecting the environmental temperature, and a control device for controlling the operation of the second valve device by the signal of each detection device. By providing it, the following effects can be obtained.

(I) Since it is possible to prevent the expanded water from flowing out of the hot water storage portion to the faucet portion at a low outside temperature, and to prevent the blockage due to freezing of the faucet portion, it is possible to prevent the pressure rise of the hot water storage portion.

(Ii) By preventing the faucet part from being blocked due to freezing, it is possible to prevent pressure breakdown of the hot water storage part.

(Iii) At low outside air temperature, water corresponding to the amount of heating and expansion is drained before heating, so the amount of heating does not flow out as expansion water and remains entirely inside the hot water storage part, eliminating heat loss and saving energy. The effect is obtained.

(Iv) Since the drainage operation of the hot water storage portion can be automatically performed, the drainage operation for cleaning the hot water storage portion is not necessary, and the usability is improved.

(V) It is possible to prevent freezing and destruction of the hot water storage portion while leaving hot water in the hot water storage portion.

[Brief description of drawings]

FIG. 1 is a block diagram of a hot water storage type hot water supply device in one embodiment of the present invention, FIG. 2 is a control sequence diagram of the same embodiment, and FIG. 3 is a configuration diagram of a conventional hot water storage type hot water supply device. 1 ... Hot water storage tank, 2 ... Heater, 3 ... Water stop valve, 4
…… Mixing valve, 5 …… motorized drainage valve, 6 …… outside air temperature detector, 7 …… opening and closing detector, 8 …… controller, 9 …… hot water supply pipe, 10 …… faucet.

Claims (1)

[Claims] 1. A hot water storage unit having a heating device, a first valve device for supplying and stopping water to the hot water storage unit, and a first detection device for detecting the presence / absence of an opening / closing operation of the first valve device. And a second valve device for draining water in the hot water storage unit, a second detection device for detecting an environmental temperature, and a closing operation of the first valve device by the first detection device. A control device is provided for keeping the second valve device open when the detection signal of the second detection device becomes equal to or lower than a set temperature for detecting the volume expansion amount of water generated by heating the second valve device. Hot water storage type hot water supply device.