JP7568548B2 - Storage tank type hot water supply device - Google Patents

Description

The present invention relates to a storage-type hot water supply device that can use water stored in a water tank even during a water outage.

There has long been a demand for resilience in storage-type water heaters, and there is a demand for storage-type water heaters that can use the hot water stored in the hot water tank even in the event of a water outage or power outage caused by lightning or an earthquake.

For example, as shown in Patent Document 1, in an emergency, a relief valve provided at the top of the tank unit is opened and an emergency water intake valve provided at the bottom of the tank unit is opened, allowing air to flow into the hot water storage tank through the relief valve, and hot water in the hot water storage tank can be taken from the emergency water intake valve into a bucket or the like (Patent Document 1).

In addition, the water in the storage tank of a storage water heater is boiled once, which removes the chlorine and other disinfectants contained in tap water, and although it is sterilized by boiling it at a high temperature, it is not recommended to use it as drinking water.

JP 2013-217619 A

However, as in Patent Document 1, when a water outage occurs due to an earthquake or other reason, even if hot water can be taken out of the hot water tank, this water is intended for daily use, and heated water is not recommended as drinking water, so securing drinking water from sources other than the hot water tank during a water outage is an important issue.

In addition, when hot water in the hot water storage tank is consumed through hot water supply operation, etc., water is supplied to the tank from the water supply pipe to make up for the consumption. However, since this water mixes with hot water that may have been stagnant for a long time, it is not recommended to use it as drinking water. If it is to be used as drinking water, there is an issue that it must not be mixed with hot water that has been heated and hot water that may have been stagnant for a long time.

In order to solve the above problems, the present invention provides a hot water storage tank for storing hot water, a water storage tank for storing drinking water, a connecting pipe connecting a lower part of the hot water storage tank and an upper part of the water storage tank, a heating means for heating water taken out of the hot water storage tank, a heating circulation circuit which is a path returning water from the lower part of the hot water storage tank to the upper part of the hot water storage tank via the heating means, a hot water outlet pipe for discharging hot water from the upper part of the hot water storage tank, a water supply pipe for supplying water to the lower part of the water storage tank, a water supply bypass pipe branching off from the connecting pipe, and a system for mixing high temperature water from the hot water outlet pipe and water supply from the water supply bypass pipe. and a hot water supply pipe that supplies mixed water mixed by the hot water supply mixing valve, the capacity of the water storage tank is smaller than the capacity of the hot water storage tank, the connecting pipe has an emergency valve that can block the flow of hot water through the connecting pipe and can be opened and closed manually, an opening and closing valve that can be opened and closed manually is provided at the top of the water storage tank, an emergency water intake valve that can take out water from the water storage tank is connected to the bottom of the water storage tank , and a check valve is provided at the connecting pipe to prevent water from the hot water storage tank from flowing into the water storage tank .

According to this invention, the capacity of the water storage tank 2 is smaller than the capacity of the hot water storage tank 1, and when the hot water in the hot water storage tank 1 is used during hot water supply operation, etc., water is supplied from the bottom of the water storage tank, and the water in the water storage tank 2 is replaced with new water. This prevents water from being stagnated for long periods of time, and ensures that fresh water that can be used as drinking water is available in the water storage tank even in the event of a power outage or water outage due to a sudden disaster such as a lightning strike or earthquake.

Even if a power outage or water outage occurs due to lightning or an earthquake, a water storage tank that stores drinking water can be provided separately from the hot water storage tank that stores boiled water, and an emergency valve can be provided on the connecting pipe that connects the hot water storage tank to the water storage tank. By closing the emergency valve when drawing water, the hot water in the hot water storage tank will not flow into the water storage tank, allowing only the water in the water storage tank to be drawn as drinking water, and the water in the water storage tank can be easily drawn from the emergency water intake valve.

FIG. 1 is a schematic diagram illustrating a first embodiment of the present invention. FIG. 2 is a schematic explanatory diagram of a second embodiment of the present invention; An example of the manual pressure pump of this invention FIG. 11 is a schematic explanatory diagram of a third embodiment of the present invention.

An embodiment of a hot water storage type water heater of the present invention will be described with reference to FIG.
In Figure 1, reference numeral 1 denotes a hot water storage tank that stores hot water for a hot water storage type water heater, 2 denotes a water storage tank that stores drinking water, 3 denotes a water supply pipe that supplies water to the bottom of the water storage tank 2, 4 denotes a hot water outlet pipe that outputs hot water from the top of the hot water storage tank 1, 5 denotes a heat pump type heating means that heats the water in the hot water storage tank 1, 6 denotes a heating supply pipe that connects the lower part of the hot water storage tank 1 to the heating means 5, 6 denotes a heating circulation pump installed midway on the heating supply pipe 6, 8 denotes a heating return pipe that connects the heating means 5 to the upper part of the hot water storage tank 1, and 9 denotes a connecting pipe that connects the lower part of the hot water storage tank 1 to the upper part of the water storage tank 2.

The heating circulation circuit is composed of a hot water storage tank 1, a heating supply pipe 6, a heating means 5, and a heating return pipe 7. Hot water boiled by the heating means 5 is stored in the hot water storage tank 1, but water that has passed through the heating circulation circuit is not stored in the water storage tank 2.

10 is an outside air temperature thermistor provided in the heating means 5 to detect the outside air temperature, and 11 is a hot water temperature thermistor provided in multiple locations on the upper and lower sides of the hot water tank 1 to detect the temperature of the hot water stored in the hot water tank 1.

12 is a water supply bypass pipe bypassed from the connecting pipe 9, 13 is a hot water supply mixing valve that mixes high-temperature hot water from the hot water outlet pipe 4 with water from the hot water supply bypass pipe 12 and controls the mixing ratio to supply hot water at the desired hot water supply set temperature, and 14 is a hot water supply pipe that supplies the hot water mixed by the hot water supply mixing valve 13 to the hot water tap 15.

This hot water mixing valve 13 can change the mixing ratio by switching the opening of the valve inside to the high temperature side (hot water outlet pipe 4 side) or the cold water side (water supply bypass pipe 12 side), and can adjust the temperature of the mixed water before dispensing it.

16 is a hot water flow sensor installed in the hot water supply pipe 14 that detects the hot water supply flow rate based on the rotation speed of the internal impeller, 17 is a hot water supply temperature thermistor that detects the hot water supply temperature, 18 is a water supply pressure reducing valve installed in the water supply pipe 3 that reduces the city water pressure to a constant water supply pressure, 19 is a water supply thermistor installed in the water supply pipe 3 that detects the city water temperature, 20 is a water supply cutoff valve installed in the water supply pipe 3 that cuts off the water supply, and 21 is a relief valve installed in communication with the top of the hot water storage tank 1 that can be opened and closed manually.

22 is a control device that controls hot water supply, and receives the detection values of the outside air temperature thermistor 10, the hot water storage temperature thermistor 11, the hot water flow rate sensor 16, the hot water temperature thermistor 17, and the water supply thermistor 19, and drives the heating circulation pump 8 and the hot water mixing valve 13.

Next, the boiling operation will be described.
When a request for boiling is made, the control device 22 drives the heating circulation pump 8 located in the heating supply pipe 6 connecting the hot water storage tank 1 and the heating means 5, pumping water from the bottom of the hot water storage tank 1, heating it in the heating means 5, and returning it to the top of the hot water storage tank 1 via the heating return pipe 7, thereby gradually boiling the water in the hot water storage tank 1 into high-temperature water.

Next, the hot water supply operation will be described.
When the hot water tap 15 is opened, water is supplied from the water supply pipe 3, and the water that flows in from the bottom of the water storage tank 2 is pushed out from the top of the water storage tank 2. The water then flows into the bottom of the hot water storage tank 1 via the connecting pipe 9 and passes through the water supply bypass pipe 12. The high-temperature water pushed out from the top of the hot water storage tank 1 and the water supply from the water supply bypass pipe 12 are mixed in the hot water mixing valve 13, and the hot water that has been adjusted so that the hot water setting temperature and the temperature detected by the hot water supply temperature thermistor 17 are the same is supplied from the hot water tap 15.

Next, the difference in capacity between the hot water tank 1 and the cold water tank 2, which is a characteristic feature of the present invention, will be described.
The capacity of the water storage tank 2 is smaller than the capacity of the hot water storage tank 1, and the amount of liquid stored therein is also smaller in the water storage tank 2 (here, the hot water storage tank 1 = 350 L, and the water storage tank 2 = 50 L).

Here, the capacity of the water storage tank 2 is set to 50 L, but is not limited to this. As a guideline, 3 L per person per day is required in an emergency, so 4 days worth x 3 L = 12 L (per person, 4 days).
For a family of four, four people x 12 L = 48 L (for four people for four days) is needed, so we set it to about 50 L. In this way, the capacity of the water storage tank 2 can be appropriately determined depending on the family composition and the number of days you want to reserve it.

In addition, because there is a water storage tank 2 connected via a connecting pipe 9 upstream of the hot water storage tank 1, when hot water supply operation is performed by mixing high-temperature water from the top of the hot water storage tank 1 with water supply bypass pipe 12 and supplying hot water from the hot water supply pipe 14, the amount of water flowing in from the bottom of the hot water storage tank 1 and the amount flowing in from the water supply bypass pipe 12 to the hot water supply mixing valve 13 are discharged from the water storage tank 2, so that water is discharged from the water storage tank 2 in the amount of water used in the hot water supply operation, and new water is supplied from the water supply pipe 3.

The upper limit of the capacity of the water storage tank 2 is preferably set to an amount less than the amount of hot water used by the user in a day. If the amount of water stored in the water storage tank 2 is less than the amount of hot water supplied in a day, all of the water in the water storage tank 2 will be replaced every day by the hot water supply operation, so fresh water can be secured in the water storage tank 2. Therefore, it is preferable that the upper limit of the capacity of the water storage tank 2 be a capacity less than the amount of hot water supplied in a day. Also, for drinking purposes, in order to prevent water from remaining in the water storage tank 2 for a long period of time, it is preferable that the amount of water stored be such that it can be consumed within at least about 3 to 4 days.

In this way, the capacity of the water storage tank 2 is smaller than the capacity of the hot water storage tank 1, and when the hot water in the hot water storage tank 1 is used during hot water supply operation, etc., water is supplied from the bottom of the water storage tank 2 and the water in the water storage tank 2 is replaced with new water. This prevents water from being stagnant for long periods of time, and ensures that fresh water is available for drinking even in the event of a power outage or water outage due to a sudden disaster such as a lightning strike or earthquake.

Next, a first embodiment of the configuration for extracting drinking water from the water tank 2 during a power outage or water outage, which is a characteristic feature of the present invention, will be described with reference to FIG. 1.

23 is a check valve provided in the connecting pipe 9 that connects the hot water storage tank 1 and the water storage tank 2, and prevents the hot water in the hot water storage tank 1 from flowing into the drinking water storage tank.

24 is an emergency valve that is provided on the connecting pipe 9 and can be switched to either stop or stop the water and air from the water tank 2 from being sent into the hot water tank 1, and 25 is an opening/closing valve that is provided in communication with the top of the water tank 2 and can be opened and closed manually.

26 is an emergency water intake pipe connected to the bottom of the water tank, and 27 is an emergency water intake valve located downstream of the emergency water intake pipe, which can be opened and closed manually.

Next, the procedure for taking out drinking water from the water tank 2 will be described.
In the event of a power outage or water outage due to a disaster such as a lightning strike or an earthquake, the water stored in the water tank 2 can be taken out from the emergency water intake valve 27 by closing the emergency valve 24, opening the opening/closing valve 25 at the top of the water tank 2, and opening the emergency water intake valve 27 at the bottom of the water tank 2.

In this way, even if a power outage or water outage occurs due to lightning or an earthquake, a water storage tank that stores drinking water is provided separately from the hot water storage tank that stores boiled water, and an emergency valve is provided on the connecting pipe that connects the hot water storage tank to the water storage tank. By closing the emergency valve when drawing water, the hot water in the hot water storage tank will not flow into the water storage tank, allowing only the water in the water storage tank to be drawn as drinking water, and the water in the water storage tank can be easily taken out from the emergency water intake valve.

In addition, the water in the water storage tank 2 is isolated from the heating path (heating supply pipe 6, heating means 5, heating return pipe 7, hot water storage tank 1) by the heating means 5, so it can be used as drinking water. This means that drinking water can be secured even during a water outage, and by providing a separate emergency water intake valve at the bottom of the hot water storage tank 1 to extract hot water for daily use, water for daily use can also be extracted from the hot water storage tank 1.

In addition, the capacity of the water storage tank 2 is smaller than the capacity of the hot water storage tank 1, and the water storage tank 2 is connected upstream of the hot water storage tank 1 via a connecting pipe 9. Therefore, when a user uses hot water from the hot water storage tank 1, the water in the water storage tank 2 flows into the hot water storage tank 1, and new water is supplied to the water storage tank 2. This prevents water from stagnating in the water storage tank 2 for long periods of time, and keeps the water in the water storage tank 2 fresh.

In addition, the connecting pipe 9 is provided with a check valve 23, so that even if the amount of water in the water storage tank 2 decreases when drawing water, the hot water in the hot water storage tank 1 will not flow back into the water storage tank 2 via the connecting pipe 9, so the water in the water storage tank 2 can remain usable as drinking water.

The connecting pipe 9 is also equipped with a check valve 23, which prevents the hot water in the hot water tank 1 from flowing into the drinking water tank 2. The water tank 2 is isolated from the boiling path, so the disinfectant in the water tank 2, such as chlorine, is not lost, ensuring that the water is suitable for drinking.

Next, a second embodiment will be described with reference to FIG. 2 with respect to a configuration and operation for taking out water from the water storage tank 2 when a pressure pump is used in the event of a water outage.
Here, the same components as those in the first embodiment are given the same reference numerals and the description thereof will be omitted.

28 is a hot water storage case unit that contains the hot water storage tank 1 and the water storage tank 2, and 29 is a pressure pump that sends air into the water storage tank 2 and pushes out the water in the water storage tank 2 by the pressure of the sent air. This pressure pump 29 is composed of a main body 30 and a delivery side hose 31. The drive mechanism of the main body 30 may be manual or electric, as long as it can send air into the water storage tank 2.

32 is a connection part provided on the hot water storage case unit 28 to connect the delivery side hose 31, and 33 is an air introduction pipe connected at one end to the connection part 32 and at the other end to the water storage tank 2. Air generated by driving the pressurized pump 29 can be sent into the water storage tank 2 via the delivery side hose 31, the connection part 32, and the air introduction pipe 33.

Even if air is pumped into the water tank 2 using the pressure pump 29, the air is prevented from leaking through the connecting pipe 9 to the hot water tank 1 or the water supply bypass pipe 12 by closing the emergency valve 24.

In addition, the emergency valve 24, the on-off valve 25, and the emergency water intake valve 27 can be switched manually, making it easy to switch the flow path even during a power outage.

Next, the procedure for taking out drinking water from the water tank 2 will be described.
In the event of a power outage or water outage due to a disaster such as a lightning strike or earthquake, the delivery hose 31 of the pressure pump 29 is connected to the connection part 32, the emergency valve 24 is closed, and the emergency water intake valve 27 is switched to the open direction.

Then, by driving the pressure pump 29, air is sent into the water tank 2, and the air pressure sent into the water tank 2 causes air to be sent from the bottom of the water tank 2 through the emergency water intake pipe 26 and the emergency water intake valve 27.

In this way, the water stored in the water tank 2 can be easily removed even if a power outage or water supply is cut off due to a disaster such as a lightning strike or earthquake.

Next, an example of a manual pressure pump 29 will be explained with reference to FIG. 3. 291 is a piston part that can be manually moved up and down, 292 is a lid part that can be opened and closed and has the function of a check valve that ensures that air only flows to the delivery side, and 293 is a gasket part equipped with a lid part.

As shown in Figure 3, when the piston part 291 is pulled upward, the lid part 292 opens and air flows into the lower part of the main body part 30. When the piston part 291 is then started to be pushed downward, the lid part 292 closes and the air at the lower part of the main body part 30 is pushed out and sent out from the delivery side hose 31. By repeating this operation, air is sent from the delivery side hose 31 to the water tank 2.

Next, a third embodiment will be described with reference to FIG. 4 with respect to the configuration and operation for taking out water from the water storage tank 2 through the hot water tap 15 when the water supply is interrupted.
Here, the same components as those in the first embodiment are given the same reference numerals and the description thereof will be omitted.

34 is a three-way water intake valve that can be manually switched to either the upstream side of the hot water supply pipe 14 or the emergency water intake pipe 26 side, and in the third embodiment, one end of the emergency water intake pipe 26 is connected to the bottom of the water storage tank 2, and the other end is connected to the three-way water intake valve 34. Also, in the third embodiment, the hot water tap 15 is a second emergency water intake tap that takes in water from the water storage tank 2.

Next, the procedure for taking out drinking water from the water tank 2 will be described.
When water in the water storage tank 2 is to be taken from the bottom of the water storage tank 2 via the emergency intake pipe 26 to the hot water tap 15 (second emergency intake tap), the emergency valve 24 is closed, the three-way intake valve 34 is switched to the emergency intake pipe 26 side, and the pressurized pump 29 is driven, causing air to accumulate in the water storage tank 2. The water is then pushed out by the accumulated air and passes through the emergency intake pipe 26, passes through the three-way intake valve 34, and joins the hot water pipe 14, and is taken from the hot water tap 15 (second emergency intake tap).

In this way, by substituting the hot water tap 15 (second emergency water intake tap), water can be taken from the bottom of the water storage tank 2 via the emergency water intake pipe 26, allowing water to be taken from the hot water tap 15 indoors, which is more hygienic.

The present invention is not limited to this embodiment, and modifications may be made without departing from the spirit and scope of the invention. For example, a manual pressurized pump 29 is described as an example of the pressurized pump 29 in the present invention, but the present invention is not limited to this, and may be one that uses centrifugal force or rotation, an electric pressurized pump 29, or a pumping pump. Since the present invention draws water from the water tank 2 as drinking water during a power outage or water outage, it is preferable that the power source of the electric pressurized pump 29 can be supplied by a backup power source or the like.

REFERENCE SIGNS LIST 1 Hot water storage tank 2 Water storage tank 3 Water supply pipe 4 Hot water outlet pipe 5 Heating means 9 Connecting pipe 12 Water supply bypass pipe 13 Hot water mixing valve 14 Hot water pipe 15 Hot water tap (second emergency water intake tap)
23 check valve 24 emergency valve 25 on-off valve 26 emergency water intake pipe 27 emergency water intake valve 28 hot water storage case unit 29 pressurizing pump 30 main body 31 delivery hose 32 connection 33 air introduction pipe 34 water intake three-way valve

Claims (1)

A hot water storage tank for storing hot water;
A water tank for storing drinking water;
a connecting pipe connecting a lower part of the hot water tank and an upper part of the water tank;
A heating means for heating the water taken out from the hot water storage tank;
A heating circulation circuit is a path that returns the hot water storage tank from the lower part to the upper part of the hot water storage tank via the heating means;
A hot water outlet pipe for supplying hot water from an upper portion of the hot water storage tank;
A water supply pipe that supplies water to a lower portion of the water storage tank;
a water supply bypass pipe branched off from the connecting pipe;
a hot water mixing valve for mixing the high-temperature water from the hot water outlet pipe and the supply water from the water supply bypass pipe;
a hot water supply pipe for supplying hot water mixed by the hot water supply mixing valve,
The capacity of the water storage tank is smaller than the capacity of the hot water storage tank,
The connecting pipe has an emergency valve that can block the flow of hot and cold water through the connecting pipe and can be manually opened and closed,
A manually operable valve is provided on the upper portion of the water storage tank;
An emergency water intake valve capable of extracting water from the water tank is connected to a lower portion of the water tank ,
A storage type hot water supply device characterized in that the connecting pipe is provided with a check valve for preventing water in the hot water storage tank from flowing into the water storage tank .

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