JPH08254356A - Storage type hot water feeding device - Google Patents

Abstract

PURPOSE: To provide a storage type hot water feeding device capable of preventing a lack of hot water pressure with a simple configuration when hot water is to be fed. CONSTITUTION: There are provided a hot water storing tank comprised of tanks 1a to 1d having water feeding ports 3a to 3d and hot water discharging ports 2a to 2d; a water feeding pipe 12 connected to the water feeding port 3a; a hot water discharging pipe 5 connected to the hot water discharging port 2d; a circulating pipe 7 forming a circulating passage for use in circulating water in the hot water tank; and an auxiliary tank 9 arranged at the midway part of the circulating pipe 7 and storing a heater 8 for heating water in the pipe. Then, there is provided a common pipe 10 in which it can be communicated with either one or the other at the midway part of each of the hot water discharging pipe 5 and the circulating pipe 7, and a pump 30 is arranged on the common pipe 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention heats water supplied by heating means into hot water and stores it in a hot water storage tank.
The present invention relates to a hot water storage type hot water supply device for supplying stored hot water.

[0002]

2. Description of the Related Art Generally, as a hot water supply system for a detached house or an apartment house, a hot water heater is used as a heating means, or a hot water storage device for storing hot water in a hot water storage tank using a heat pump device is installed in the building. There is also a hot water supply pipe that can be used to supply hot water to the taps installed in this building. In such a system, the hot water storage tank is composed of multiple hot water storage tanks to reduce the space of the hot water storage tank, and the temperature of the hot water is prevented from lowering due to heat radiation. There have been many proposals for circulating hot water so that the water can be provided.

FIG. 6 shows a conventional hot water storage type electric water heater disclosed in, for example, Japanese Patent Application Laid-Open No. 1-163553. In the figure, 1 is a hot water storage tank including a plurality of tanks 1a to 1c connected in parallel, 2a to 2c and 3a to 3c are tap holes and water supply ports of the tanks 1a to 1c, respectively. Reference numeral 9 is an auxiliary tank in which a water supply port 9a and a hot water outlet 9b are connected to the hot water storage tank 1 so as to be in parallel, and as a result, the hot water outlets 2a to 2c and 9b are the hot water outlet pipe 17
In addition, the water supply ports 3a to 3c and 9a are connected to the water supply pipe 12.

A water outlet 9c is provided near the water inlet 9a of the auxiliary tank 9. 40 is a three-way valve provided in the middle of the water supply pipe 12 leading to the water supply port 9a of the auxiliary tank 9 and is connected to the water outlet 9c, so that the water supply pipe 12 side and the water outlet 9c side can be switched and connected to the water inlet 9a side. It is configured. 10
Is a pump whose primary side is connected to the three-way valve 40 side. Four
1 is a heat exchanger for hot water supply, one of which is connected to the secondary side of the pump 10 and the other of which is connected to the water supply port 9a side, and 50 is a tank 1a
It is an opening / closing valve provided in the vicinity of the water supply ports 3a to 3c of each tank in the middle of the branch pipe branched from the water supply pipe 12 toward 1c.

Next, the operation will be described. On-off valve 50a
~ 50c is opened, and the three-way valve 40 is connected to the water supply pipe 12 and the water supply port 9.
By controlling so as to communicate with a, the hot water storage tank 1
Water is supplied to each of the tanks 1a to 1c and the auxiliary tank 9.
After the water supply is completed, open the three-way valve 40 from the water supply pipe 12 side to the outlet 9c.
And the circulation system between the auxiliary tank 9 and the hot water supply heat exchanger 41 is formed. Water in the auxiliary tank 9 is pump 10
Driven out of the water outlet 9c, goes through the pump 10, and is heated by the hot water supply heat exchanger 41 to become hot water.
Return from a to the auxiliary tank 9.

When all of the auxiliary tank 9 is heated to the desired temperature, the three-way valve 40 switches from the water outlet 9c side to the water supply pipe 12 side again. At the same time, only the open / close valve 50a of the tank 1a of the hot water storage tank 1 is in the open state, and the remaining open / close valve 5
0b and 50c are closed, and the tank 1a and the auxiliary tank 9
Form a circulatory system with. Then, by driving the pump 10, the water in the tank 1a moves to the auxiliary tank 9, and at the same time, the hot water in the auxiliary tank 9 moves to the tank 1a due to the pressure difference caused by the movement of the water in the tank 1a. To do.

The hot water in the auxiliary tank 9 is generally the same as the tank 1a.
When moved to, the three-way valve 40 moves from the water supply pipe 12 side to the water outlet 9
The water is switched to the c side, and the water in the auxiliary tank 9 is heated to become warm water by the same process as described above. After that, the same process is repeated, and this operation is continued until all the water in the tank 1a is replaced with hot water. When all the water in the tank 1a is replaced with hot water, the open / close valve 50a is closed, and subsequently only the open / close valve 50b of the tank 1b is opened, which is similar to the above-described operation for making the water in the tank 1a warm water. The operation of is repeated. Similarly, the water in the tank 1c also becomes hot water, after which the pump 10 is stopped and boiling is completed.

At the time of hot water supply, the three-way valve 40 is switched to the water outlet 9c side, and the on-off valve 50a is opened. When the user taps hot water from the hot water tap installed at the end of the hot water pipe 17, the pressure on the hot water tap side decreases and the water supply pressure on the water supply pipe 12 side causes water to flow from the water supply port 3a into the tank 1a. The hot water in the tank 1a is pushed up to the hot water outlet 2a side, and the hot water is supplied to the hot water outlet pipe 17. At this time, since the three-way valve 40 communicates with the water outlet pipe 9c side, the water in the auxiliary tank 9 does not flow out to the hot water outlet pipe 17 due to the water supply water pressure from the water supply pipe 12.

[0009]

The conventional hot water storage type hot water supply apparatus is configured as described above, and the water supply pressure from the water supply pipe to the tank is specified by the standard because of the volume expansion of water caused by heating. The pressure must be reduced to a constant pressure of about 0.8 kgf / cm ² by the pressure reducing valve. As a result,
If hot water is simultaneously discharged at multiple locations, the pressure inside the hot water supply pipe will suddenly drop, and the amount of hot water will be insufficient. On the other hand, since the water pressure of tap water is relatively high, there is a problem that when hot water from a hot water storage tank is mixed with tap water and tapped, the temperature is lowered due to insufficient amount of hot water.

Further, this kind of hot water storage type hot water supply device is generally used by being divided into a boiling operation and a hot water supplying operation, but recently, when hot water runs out, the function of boiling the hot water by additional cooking is provided. Some of them have a multi-function, and it is necessary to always supply stable hot water without causing a pressure drop even in such a multi-function product. The present invention has been made to solve the above problems, and an object of the present invention is to provide a hot water storage type hot water supply device that can prevent insufficient hot water pressure during hot water supply with a simple configuration.

[0011]

A hot water storage type hot water supply apparatus according to the present invention includes a hot water storage tank having a water supply port and a hot water supply port, a water supply pipe connected to the water supply port, and a hot water supply pipe connected to the hot water supply port. A circulation pipe that forms a circulation path for circulating the water in the hot water storage tank, and a heating means that is provided in the middle of the circulation pipe to heat the water in the pipe, and a middle portion of each of the hot water discharge pipe and the circulation pipe Is a common pipe that is switchably connected to one of the two, and a pump is arranged on this common pipe.

Further, heating means is provided in the middle of the common pipe.

Further, the end of the circulation pipe separated from the common pipe is connected in the middle of the hot water discharge pipe reaching the common pipe.

Further, the heating means is provided in the middle of the hot water outlet pipe from the hot water outlet to the connection with the end of the circulation pipe.

[0015]

In the hot water supply type hot water supply apparatus according to the present invention, the common pipe is connected to the circulation pipe to form a circulation system during the boiling operation, and the water in the hot water storage tank is caused to flow to the circulation pipe by driving the pump. The water that circulates is heated by the heating means provided in the middle of the circulation pipe. The heated hot water flows into the hot water storage tank through the circulation pipe and is stored in the hot water storage tank. During hot water supply operation, the common pipe is connected to the hot water outlet pipe, and hot water in the hot water storage tank is pressurized by the pump and supplied to the hot water tap side.

In addition, during the reheating operation in which hot water heated by the heating means is directly discharged, hot water heated by the heating means in the middle of the common pipe and pressurized by the pump is supplied to the tap tap side. To do.

Further, the hot water heated by the heating means during the boiling operation flows from the circulation pipe to the hot water storage tank through the shared pipe connected to the hot water outlet.

During the reheating operation in which the hot water heated by the heating means is directly discharged, the heating means is provided in the middle of the hot water outlet pipe from the hot water outlet to the connection with the end of the circulation pipe. , Hot water pressurized by a pump in the common pipe is supplied to the tap side.

[0019]

【Example】

Example 1. Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a system configuration diagram showing a hot water storage type hot water supply system including a hot water storage type hot water supply device of the present invention.
Reference numeral 1 denotes a hot water storage type hot water supply apparatus which will be described in detail with reference to FIG. 2, reference numeral 102 denotes an external water supply pipe 103, and an external water supply port for taking in tap water from the external water supply pipe 103 to the hot water storage type hot water supply apparatus 101,
A hot water supply pipe 104 is connected to a hot water supply pipe 105 that is piped in the building, and is heated to a predetermined temperature by being mixed with tap water after being boiled by the hot water storage type hot water supply device 101.
It is a mixed tap for discharging to 5 and supplying it to various places in the building.

Reference numeral 106 denotes a hot-water tap provided at an appropriate place in the building, which is provided as needed, for example, in a bathroom lantern, a shower in a shower room, a water area in a kitchen, or hot water for washing. Reference numeral 107 denotes a mixing tap provided immediately before the hot water tap, which mixes hot water supplied from the hot water storage type hot water supply apparatus 101 through the hot water supply pipe 105 with tap water supplied through the water supply pipe 103. The water temperature of each hot water tap is adjusted to an appropriate level before the hot water tap 106 is supplied. Incidentally, the water supply pipe 103,
The structures of the tap tap 106 and the mixing tap 107 are similar to those of the conventional one.

Further, the hot water supply pipe 105 is different in that the mixed hot water flows inside, but the structure of the pipe is common in that it is made of the same heat-resistant material as the hot water supply pipe for supplying the boiling water from the conventional hot water storage type hot water supply device. From these facts, in this hot water storage type hot water supply system, it is possible to use the same structure as the conventional piping and taps in the building except the hot water storage type hot water supply device, It can be installed by the same piping work and replacement work as the conventional one.

FIG. 2 shows a hot water storage type hot water supply apparatus 10 shown in FIG.
1 is a configuration diagram showing an internal configuration of 1, in which 1 is a hot water storage tank built in a hot water storage type hot water supply apparatus 101, which is composed of four tanks 1a, 1b, 1c, and 1d, and the upper part of each tank is The outlets 2a, 2b, 2c, 2d are
Further, there are water supply ports 3a, 3b, 3c, 3d in the lower part, and the hot water outlet 2a of the tank 1a and the water supply port 3b of the tank 1b are connected by a connecting pipe 4a. Similarly, the hot water outlet 2b of the tank 1b and the tank 1c are connected. Of the tank 1c and the water supply port 3d of the tank 1d are connected by a connecting pipe 4c, and these tanks 1a to 1d are connected in series to form the hot water storage tank 1. ing.

5 is a hot water outlet pipe connected to the hot water outlet 2d of the tank 1d, 6 is a water intake provided near the water supply port 3a at the bottom of the tank 1a, 7 is one end connected to the water intake 6 and the other end is A circulation pipe connected in the middle of the hot water supply pipe 5, 8 is a heater for heating the water in the circulation pipe 7, and is arranged in an auxiliary tank 9 provided in the middle of the circulation pipe 7, and these heaters are provided. 8 and the auxiliary tank 9 constitute a heating means. Reference numeral 10 is a shared pipe that is formed by sharing the hot water outlet pipe 5 and the circulation pipe 7 and is shared, and 25 is a shared pipe 10 that includes the hot water outlet pipe 5 extending from the hot water outlet 2d and the circulation pipe 7 extending from the water intake 6.
Is a first switching valve which is provided in a portion connected to one of the two and communicates either the hot water discharge pipe 5 or the circulation pipe 7 with the common pipe 10.

The other side of the common pipe 10 for 26 is a tap 106.
Is provided in a portion connected to the circulation pipe 7 that reaches the middle of the discharge pipe 5 that connects the shared pipe 10 from the discharge pipe 5 and the discharge port 2d, among these shared pipe 10, the discharge pipe 5 and the circulation pipe 7. The second that connects two of them in a switchable manner
, 30 is a pump provided in the middle of the common pipe 10 so that the primary side is the first switching valve 25 side and the secondary side is the second switching valve 26 side, and 11 is the vicinity of the water supply port 3a of the tank 1a. Is a pressure reducing valve connected via a connecting pipe so that the water supply port 3a side is the secondary side, and is normally set to set the water pressure on the secondary side of the pressure reducing valve 11 to about 0.80 kgf / cm ^2. There is.

Reference numeral 12 denotes a water supply pipe connected to the primary side of the pressure reducing valve 11. One side is exposed as an external water supply port 102 to the outside of the hot water supply type hot water supply device 101 and is connected to an external water supply pipe 103.
The other side is branched at a branch portion in the middle of the hot water storage type hot water supply apparatus 101, one of which is connected to the primary side of the pressure reducing valve 11 to form a first water supply pipe 12a for supplying water to the hot water storage tank 1, and the other is The bypass pipe 12b is configured. Reference numeral 13 is connected to the downstream end of the hot water discharge pipe and is also connected to the bypass pipe 12b, so that the hot water supplied from the hot water storage tank 1 via the hot water discharge pipe 5 and the water supplied via the bypass pipe 9b are predetermined. It is a mixing device that mixes at temperature to obtain mixed hot water.

Since the hot water heated by the heater flows through the hot water outlet pipe 5 from the hot water outlet 2d of the tank 1d to the mixing device 13, the distance is as short as possible so as to minimize the heat loss due to heat radiation. Is configured to be. Reference numeral 14 denotes a mixed hot water supply pipe for supplying the mixed hot water, which has been mixed by the mixing device 13 and has reached a predetermined temperature, to the outside of the hot water storage type hot water supply device 101, and its end is exposed to the outside of the hot water storage type hot water supply device 101 as a mixed hot water outlet 104. It is connected to an external hot water supply pipe 105 that is appropriately disposed inside.

As described above, the hot water storage type hot water supply apparatus 101 has the external water supply port 10 whose water supply side is connected to the external water supply pipe 103.
2. The appearance is conventional except that it has a mixed hot water outlet pipe 104 connected to an external hot water supply pipe 105 on the outlet side, and a pressure reducing valve 11 is provided inside the device to reduce the pressure after passing through a branching portion. There is no big difference from the conventional hot water storage type hot water supply device, and the system can be easily configured. 106
a is an external hot water supply pipe 105 without a mixing plug 107.
The hot water tap is connected to the hot water outlet and the hot water is discharged without adjusting the temperature. Reference numeral 16 is a hot water temperature detecting means provided on the outer peripheral wall of the mixed hot water supply pipe 12 for detecting the hot water temperature of the hot water mixed. 18
Is a flow rate detecting means provided on the secondary side of the pump 30, and based on the detection result of the flow rate detecting means 18, a control means (not shown) controls the pressure by the pump 30.

The operation of the hot water storage type hot water supply apparatus configured as described above will be described below. First, the first switching valve 25 connects the circulation pipe 7 to the pump 30 side, and the second switching valve 26 connects the pump 30 side to the circulation pipe 7. As a result, a circulation system that connects the hot water storage tank 1, the pump 30, and the auxiliary tank 9 with a circulation pipe is formed. In this state, the water supplied from the external water supply pipe 103 flows into the hot water storage type hot water supply device 101 from the external water supply port 102, and the water that has flowed into the pressure reducing valve 11 after passing through the branch portion is reduced in pressure by the pressure reducing valve 11.
Is reduced to a predetermined water pressure (here, about 0.8 kgf / cm ² ), flows into the tank 1a from the water supply port 3a of the tank 1a of the hot water storage tank 1, and is stored in the tanks 1a to 1d.

At this time, a part of the supplied water also flows into the circulation pipe 7 from the water outlet 6 and is also supplied to the auxiliary tank 9. After the storage is completed, the water accumulated in the auxiliary tank 9 is heated to a predetermined boiling temperature (for example, 85 ° C.) by using the heater 8 provided in the tank and using, for example, late night electric power of an AC 200V power source, which is inexpensive. Heat to a boil. After boiling, the water stored in the hot water storage tank 1 is driven by the pump 10 to flow out from the water intake 6, is sucked into the pump 30 through the circulation pipe 7, and the water passing through the pump 30 is stored in the auxiliary tank 9. Hot water is pushed out by water pressure, and the hot water in the auxiliary tank 9 flows into the hot water storage tank 1 from the hot water outlet 2d.

Through the above steps, the pump 30 is placed in the auxiliary tank 9 instead of the hot water pushed out from the auxiliary tank 9.
The water from the hot water storage tank 1 that has been moved by is stored. Here, the pump 30 once stops, the flow of water in the circulation pipe 7 is stopped, and the water accumulated in the auxiliary tank 9 is boiled in the same manner as described above. After boiling, the pump 30 is activated again, and hot water in the auxiliary tank 9 is stored in the hot water storage tank 1 in the same manner as described above.
The water is stored in the auxiliary tank 9 instead. When the above steps are repeated and the water in the hot water storage tank 1 circulates once, the hot water in the hot water storage tank 1 is entirely replaced with hot water.

As the boiling time when the midnight power is used, for example, the rated capacity of the total hot water storage tank 1 is 370 l, the heater capacity of the heater 8 is 4 kW, and the water temperature in the hot water storage tank 1 is 1.
When the temperature is set to 5 ° C, the water in the hot water storage tank 1 is circulated for 85
It takes 7.5 hours to boil to ℃, and it is boiled within the midnight power hours. After boiling, the pump 30 is stopped to end the boiling operation, and then the hot water outlet pipe 17 and the pump 30 side are communicated with each other by the first switching valve 25 and the pump is driven by the second switching valve 26. The common pipe 10 is used as a part of the hot water discharge pipe 5 by connecting the 30 side and the mixing device 13 side.

As described above, since the first switching valve 25 and the second switching valve 26 are not switched during the boiling operation, the boiling time does not take an extra amount for the switching time. Further, since the flow path is fixed to one circulation path for boiling, heat loss during the boiling operation is reduced.

After that, when the hot water tap 106 provided at an appropriate place in the building is opened through the hot water supply pipe 105 connected to the terminal side of the mixed hot water supply pipe 14, the tap water that acts through the pressure reducing valve 11 is supplied. The hot water in each hot water storage tank 1a to 1d that has been boiled up and stored by the water pressure is pushed up, and the hot water flows out from the hot water outlet 2d of the hot water storage tank 1d on the final stage side. At this time, water corresponding to the amount of hot water that has flowed out is automatically supplied from the water supply port 3a of the hot water storage tank 1a on the first stage side through the water supply pipe 12a.

The hot water of 85 ° C. flowing out from the tap hole 2d is branched at the primary side of the pressure reducing valve 11 and bypass pipe 12b.
And the water supplied through the mixer and mixing device 13
It is mixed at a predetermined ratio between 1 and 1, is controlled to a predetermined temperature (for example, 40 ° C.), and is discharged from the hot water supply pipe 106 via the mixed hot water supply pipe 14 and the hot water supply gap 105. The hot water temperature is set by the control means (not shown) based on the set temperature determined by the hot water temperature setting means (not shown) and the hot water temperature of the mixed hot water detected by the hot water temperature detecting means 16. In order to obtain hot water, for example, control such as changing the ratio between the hot water valve and the hot water valve of the mixing device 13 is performed by an actuator.

Then, the mixed hot water whose temperature is lowered in advance by the mixing device 13 is supplied to various places in the building through the hot water supply pipe 105. Depending on the required hot water temperature, only the hot water or only the hot water may be discharged or discharged by the mixing device 13. After this, if the hot water discharged from the hot water tap 106 is higher than the desired temperature, it may be mixed with the water supplied from the water supply pipe 103 by the mixing tap 107 and lowered to the desired temperature. When the temperature of the mixed hot water is lower than the desired hot water temperature, the hot water tap 106 cannot correct the temperature, so it is better to supply the mixed hot water at a temperature slightly higher than the actual desired hot water temperature.

Further, since the temperature of the mixed hot water is influenced by the season and the length of the pipe, it is necessary to take this into consideration. These may be set by the hot water temperature setting means each time, or may be added to the control means according to the system when the system is introduced. In any case, since the temperature of the mixed hot water after being mixed by the mixing device 13 is close to the actual usage level in this way, the hot water that has been boiled is supplied as is to the hot water tap 105 by the hot water supply pipe 105. Compared to the case
The temperature difference from the outside air is small, the decrease in hot water temperature during passage through the hot water supply pipe is small, and the dead water loss is also reduced.

When hot water is supplied, the hot water from the hot water outlet 2d passes through the pump 30, so that the pump 30 pressurizes the hot water. For example, when a large amount of hot water is discharged from the hot water tap 106, the hot water temperature and the hot water amount may fluctuate. However, even in such a case, by increasing the hot water supply pressure by the pump 30, stable hot water can be supplied to the mixing device 13. Can be supplied. Therefore, a stable hot water temperature and hot water amount can be provided through the mixing device 13, the hot water temperature of the mixed hot water does not become unstable, and the pressure shortage on the terminal side can be eliminated.

The timing of starting or stopping the pump 30 is controlled by a control means (not shown) based on the detection signal from the flow rate detection means 18. As a result, the end tap 10
Even if the water pressure of the hot water supply pipe 105 changes due to the use of 6, the pump 30 can be controlled to adjust the amount of the mixed hot water while keeping the mixed hot water temperature in the mixing device 13 constant. Further, for example, the control unit obtains the water pressure on the secondary side of the pump 30 from the pressure detection unit 15, and controls the pump 30 by, for example, an inverter so that the set pressure is obtained based on the set signal from the pressure setting unit (not shown). It may be configured. As a result, adjustments can be made when it is desired to set the pressure level to a certain predetermined level depending on the piping structure in the building, its modification, and the original water pressure conditions.

As described above, the pump 30 in this embodiment serves both as a circulation pump for boiling and a pressurizing pump for supplying hot water, and one pump can perform both functions. Therefore, the size and weight of the apparatus can be reduced. The cost can be reduced. Also,
When the hot water storage tank is composed of a plurality of tanks 1a to 1d as in this embodiment, the diameter of the tank can be made smaller as compared with the case where a single tank is used, so that the tank can be thinned in a specific direction. Can be achieved. This allows it to be installed under the floor or in a narrow space. by the way,
In general, when a hot water storage tank is configured by a plurality of such tanks, the pressure difference, that is, the pressure drop between the water supply port and the hot water outlet is large by the amount of the connecting pipe and the like, and the effect of providing a pump on the hot water outlet pipe is great. .

The pump of the present embodiment is different from the conventional pump provided only for raising the water pressure in the middle of the external hot water supply pipe in order to supply hot water to a high place. It has a unique function in stabilizing the temperature and volume of the mixed hot water when obtaining hot water, but as a result, there is no pressure drop in the hot water storage tank, such as when a hot water storage tank is composed of multiple tanks. Even when it is applied to a large device, it greatly contributes to the recovery of the pressure, and one pump can be operated efficiently. Since the pressure control depends on the hot water temperature and the hot water amount of the mixed hot water, no complicated control of the pump is particularly required to recover the pressure drop in the tank due to the structure of the hot water storage tank.

Further, due to the increase in the hot water supply load, the hot water storage tank 1
When the amount of hot water at the boiling temperature inside is insufficient, the common pipe 10 is brought into communication with the circulation pipe 7 as in the above-described boiling operation, and the hot water storage tank 1, the pump 30, the auxiliary tank 9
To form a circulation system that connects these with a circulation pipe. Then, the water stored in the hot water storage tank 1 flows out from the water intake 6 by driving the pump 10, and the boiled hot water flows in from the hot water outlet 2d. At this time, if the amount of hot water to be boiled can be set arbitrarily, it is possible to add as much boiling water as needed sequentially from the outlet 2d side of the tank 1d of the hot water storage tank 1, thus shortening the driving time and running out of hot water. It can be prevented.

When hot water is urgently required, the auxiliary tank 9 is boiled with the capacity of the auxiliary tank 9 by an external operation, and the second switching valve 26 is provided to the auxiliary tank 9 side. To communicate with the mixing device 13 side,
Direct mixing device 13 for hot water equivalent to the capacity of auxiliary tank 9
By sending the hot water to the auxiliary tank 9, the hot water stored in the auxiliary tank 9 can be used as a spare tank for additional cooking. In addition, in preparation for such a situation, it is possible to boil water for 1 minute in the hot water storage tank during the original boiling operation and then always boil the water remaining in the auxiliary tank 9.

Further, after boiling the water for one minute in the hot water storage tank during the boiling operation, all the water in the circulation pipe 7 including the auxiliary tank 9 is boiled to make all the water in the circulation system hot water, and then the pump. 10 may be stopped, and the first switching valve 25 and the second switching valve 26 may be switched so that the common pipe 10 and the hot water outlet pipe 5 communicate with each other. As described above, according to the configuration of the present embodiment, since the hot water supply pipe is provided with the pressurizing pump, it is possible to prevent a decrease in the hot water pressure at the time of hot water discharge to cause a shortage of hot water or a temperature drop. Since this pressurizing pump also serves as a circulation pump for circulating water through the circulation pipe during the water heating operation, it can be realized without increasing the size of the device or increasing the cost.

Further, since the switching valve is not frequently switched at the time of boiling or tapping hot water, and the circulation route of water during boiling does not change, efficient boiling can be performed in a short time.
In addition, when the hot water runs out and additional cooking is performed, you can choose to store the required amount of hot water in the hot water storage tank or directly discharge hot water for emergency, and hot water is directly discharged from the circulation pipe with heating means. However, it does not mix with the water in the hot water storage tank, and it is possible to provide hot water with a stable hot water temperature even during additional cooking operation. Further, it is not necessary to provide a valve for switching between the hot water passage from the hot water storage tank and the hot water passage from the auxiliary tank on each of the hot water storage tank side and the auxiliary tank side, and the cost can be reduced and additional cooking can be efficiently performed.

In the above embodiment, the water supply port 3 is added to the tank 1a.
Although the water intake port 6 and the water intake port 6 are separately provided, as shown in FIG. 3, the tank 1a has only the water supply port 3a, and the water supply pipe 12a is connected near the connection portion of the water supply pipe 12a connected to the water supply port 3a. And the circulation pipe 7 may be branched.
By doing so, the common tanks 1a to 1d can be used, and the cost can be reduced. Further, if the tap hole 2d is used as a tap hole connection port and a circulation pipe connection port is used as shown in FIG. Even if hot water is boiled and stored in the hot water storage tank 1, it does not mix with the water in the tank.

In this embodiment, one end of the circulation pipe 7 is connected to the hot water outlet pipe 5 and is connected to the hot water outlet 2d as a shared pipe with the hot water outlet pipe. As shown in FIG. 2, the circulation pipe 7 is provided near the tap hole 2d of the tank 1d.
It is also possible to provide a hot water outlet to which is directly connected, and to completely separate both ends of the circulation pipe 7 from the hot water discharge pipe 5. In this case, except for the common pipe 10, there is no part where the hot water outlet pipe and the circulation pipe are shared. With this structure, the tank 1a and the tank 1d have one connection hole on one side and two connection holes on the other side, so that the tanks can be shared. The cost can be reduced.

Example 4. FIG. 5 is a configuration diagram showing another embodiment of the present invention. In the figure, a hot water outlet pipe 5 between a hot water outlet 2d of a tank 1d on the final stage side of a hot water storage tank 1 and a connecting portion of a circulation pipe 7 is shown. That is, the auxiliary tank 9 is provided in the middle of a portion used as a common pipe with the circulation pipe. Other configurations are the same as those of the third embodiment, and the same or corresponding portions are denoted by the same reference numerals and the description thereof will be omitted.

Next, the operation will be described. The operations during the boiling water operation and the hot water supply operation are the same as in the first embodiment. A feature of this embodiment is that when hot water is run out when hot water runs out, the hot water boiled in the auxiliary tank 9 is directly supplied to the mixing device 13 to be discharged. As in the case of operation, the first switching valve 25
The hot water outlet pipe 5 and the pump 30 side are communicated with each other, and the pump 30 side and the mixing device 13 are connected by the second switching valve 26.
The point is that the common pipe 10 is used as a part of the tap pipe 5 in communication with the side.

With this structure, even when the hot water boiled in the auxiliary tank 9 is directly discharged during the additional cooking operation, a flow path that passes through the pump 30 is formed, so that the hot water is pressurized and discharged. You can Therefore, the hot water to be supplied can be constantly pressurized by the pressurizing pump 30, so that the hot water temperature and the hot water amount do not fluctuate even under conditions such as additional cooking, as in the normal hot water supply operation.
Although the auxiliary tank 9 is provided in the hot water outlet pipe 5 between the hot water outlet 2d and the connecting portion of the circulation pipe 7 in the above embodiment, it may be provided in the middle of the common pipe 10.

In each of the above embodiments, the auxiliary tank 9 having the heater 8 as the heating means for heating the water stored in the tanks 1a to 1d of the hot water storage tank 1 is provided. May be used as the heat source. In this case, for example, instead of the auxiliary tank 9, a heat exchanger acting as a condenser in the heat pump system is provided, and the heat of condensation when the refrigerant condenses in the heat exchanger is applied to the hot water circulating in the heat exchanger to heat it. . Therefore, due to the formation of the circulation system between the hot water storage tank 1 and the heat exchanger, the water in the tanks 1a to 1d circulates in the heat exchanger, whereby the water temperature rises and is boiled up. Further, in each of the above embodiments, the hot water storage tank 1 is composed of a plurality of tanks 1a to 1d, but the same operational effect can be obtained even with a single tank.

[0051]

As described above, according to the present invention, a hot water storage tank having a water supply port and a hot water outlet, a water supply pipe connected to the water supply port, a hot water outlet pipe connected to the hot water outlet, and a hot water storage tank A circulation pipe that forms a circulation path for circulating water, and a heating unit that is provided in the middle of the circulation pipe to heat the water in the pipe are provided. Since it is a shared pipe that can be switched to one side and the pump is installed on this shared pipe, one pump can be used both as a circulation pump in the circulation path when boiling and a pressure pump when tapping hot water. With such a configuration, it is possible to obtain an effect that efficient boiling and stable supply of hot water can be realized.

Further, since the heating means is provided in the middle of the common pipe, the hot water heated by the heating means can be pressurized by the pump even when the hot water is heated directly by the heating means during additional cooking.
The effect is that stable hot water can always be provided.

Further, since the end of the circulation pipe separated from the common pipe is connected in the middle of the hot water discharge pipe leading to the common pipe, hot water is sequentially supplied from the hot water outlet of the hot water storage tank at the time of boiling to efficiently store hot water. It is possible to obtain the effect that the number of parts can be reduced.

Further, since the heating means is provided in the middle of the hot water outlet pipe from the hot water outlet to the connection with the end of the circulation pipe, the pump can be used even when hot water heated by the heating means is directly discharged during additional heating. The effect of being able to pressurize and always providing stable hot water is obtained.

[Brief description of drawings]

FIG. 1 is a system configuration diagram showing a hot water storage type hot water supply system of the present invention.

FIG. 2 is a configuration diagram showing a hot water storage type hot water supply device according to Embodiment 1 of the present invention.

FIG. 3 is a configuration diagram showing another hot water storage type hot water supply device according to Embodiment 1 of the present invention.

FIG. 4 is a configuration diagram showing another hot water storage type hot water supply device according to Embodiment 1 of the present invention.

FIG. 5 is a configuration diagram showing a hot water storage type hot water supply device according to a second embodiment of the present invention.

FIG. 6 is a configuration diagram showing a conventional hot water storage type hot water supply device.

[Explanation of symbols]

1 Hot water storage tank, 2 Hot water outlet, 3 Water inlet, 4
Connection pipe, 5 hot water pipe, 6 intake, 7 circulation pipe, 8 heater, 9 auxiliary tank, 10 shared pipe, 11 pressure reducing valve, 12 water supply pipe, 12a 1st
Water supply pipe, 12b bypass pipe, 13 mixing device, 14 mixed hot water supply pipe, 15 pressure detection means,
16 hot water temperature detecting means, 18 flow rate detecting means, 101
Hot water storage type hot water supply device, 102 External water supply port, 103
External water supply pipe, 104 mixed hot water outlet, 105 hot water supply pipe, 106 hot water tap, 107 hot water tap

Claims (4)

[Claims] 1. A hot water storage tank having a water supply port and a hot water outlet, a water supply pipe connected to the water supply port, a hot water outlet pipe connected to the hot water outlet, and a circulation path for circulating water in the hot water storage tank. A circulation pipe to be formed, and a heating means provided in the middle of the circulation pipe to heat water in the pipe,
An intermediate part of each of the hot water pipe and the circulation pipe is a common pipe that is switchably connected to one of the two.
A hot water storage type hot water supply device characterized in that a pump is arranged on this common pipe. 2. The hot water storage type hot water supply apparatus according to claim 1, wherein the heating means is provided in the middle of the common pipe. 3. The hot water storage type hot water supply apparatus according to claim 1, wherein an end portion of the circulation pipe separated from the common pipe is connected in the middle of the hot water discharge pipe reaching the common pipe. 4. The hot water storage type hot water supply apparatus according to claim 3, wherein the heating means is provided in the middle of the hot water outlet pipe from the hot water outlet to the connection with the end of the circulation pipe.