JPH0674923B2 - Large capacity water heater - Google Patents

Description

TECHNICAL FIELD The present invention relates to a large-capacity water heater with an instantaneous water heater, which is suitable for large-scale houses, apartments, and other collective housing, or for businesses such as dining rooms and restaurants. Is.

[Prior Art] As a large-capacity hot water supply apparatus as described above, a hot water storage tank is provided, and hot water in the hot water storage tank is heated by an instantaneous water heater using a circulation pump for heating and then returned to the hot water storage tank. Japanese Patent Application Laid-Open No. 63-91453 proposes a system in which a heating circulation system is constituted and hot water is supplied from the hot water storage tank.

FIG. 7 shows an outline of the large capacity water heater, 1 is a hot water storage tank, which is a closed type that withstands the water supply pressure, and has a volume that takes into consideration the amount of hot water used during the maximum usage time. To do.

A hot water supply pipe 2 and an outlet pipe 3 ′ of a heating circulation system 3 are connected to the bottom of the hot water storage tank 1, and a heating circulation pump 4 and an instantaneous water heater 5 are arranged in the heating circulation system to store hot water. It is connected so as to return to the upper part of the tank 1.

Further, a hot water temperature detector 6 is attached to the lower portion of the hot water storage tank 1, and is configured to drive the circulation pump 4 for heating when it is detected that the hot water temperature at the lower portion of the hot water storage tank has decreased. .

The hot water supply line 7 is taken out from the upper part of the hot water storage tank 1,
It is connected to a hot water outlet pipe 9 having hot water taps 8 at appropriate places such as a shower tap. Further, the outlet pipe 9 is connected to the return pipe 10
Piping to return to the upper part of the hot water storage tank 1 via
If a check valve 11 is arranged in the hot water supply line 7 and a circulation pump 13 for immediate hot water is arranged in the bypass pipe 12 and the circulation pump 13 for immediate hot water is operated, the tap 8 is opened. It is configured so that hot water of appropriate temperature can be obtained immediately. 2'is a water supply valve and 5'is a gas valve.

Since the high-capacity water heater shown in FIG. 7 has the above-described structure, the system is completely filled with water by venting air by opening the water supply valve 2'and opening the hot water tap 8. When the valve is opened and the power is turned on, the water supply temperature is lower than the set temperature of the hot water temperature detector 6, so the circulation pump 4 for heating is driven, and the water drawn from the lower part of the hot water storage tank 1 is instantaneously heated by the hot water heater. After being heated to 5 and ignited and heated, it is returned to the upper part of the hot water storage tank 1, and by repeating this, the proportion of the high temperature region increases and the high temperature region falls, and the installation position of the hot water temperature detector 6 is changed. When the temperature reaches the high temperature range, the circulation pump 4 for heating is stopped and put into use.

Then, when the hot water tap 8 is opened in this state, the water supply pressure is applied to this device, so that hot water is discharged at a high pressure equivalent to the water supply pressure, and accordingly, the same amount of water is supplied through the water supply pipe 2 to the hot water storage tank 1 When the hot water temperature detector detects that the temperature is low, the circulating pump 4 for heating is driven again. Then, the heating circulation is performed.

As described above, in the hot water supply device shown in FIG. 7, the upper part of the hot water storage tank maintains a substantially constant optimum temperature by sequentially performing hot water discharge and heating circulation. The hot water stored in the tank functions as a quantitative buffer and can supply a large amount of hot water for a long time.

[Problems to be Solved by the Invention] However, in the conventional example shown in FIG. 7, when hot water was continuously used and the hot water in the hot water tank was replaced by water, the hot water was instantaneously discharged from the water heater. There is a problem in that the hot water is mixed with water in the hot water storage tank and the hot water discharge temperature is extremely lowered as shown in FIG.

Further, in the conventional example shown in FIG. 7, since the water pressure to the instantaneous water heater is determined by the pressure of the heating circulation pump, the ability of the heating circulation pump 4 to obtain a large flow rate from the instantaneous water heater. Needs to be increased.

The present invention solves the problems of the prior art as described above, and is capable of supplying a large amount of hot water of a suitable temperature even if the hot water in the hot water storage tank is replaced by water with a relatively simple and inexpensive structure. ,And,
An object of the present invention is to provide a large-capacity water heater capable of enhancing the hot water discharge capacity of an instantaneous water heater without increasing the capacity of the heating circulation pump.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention connects a water supply pipe and an outlet pipe of a heating circulation system to the bottom of a sealed hot water storage tank,
The heating circulation system is arranged so as to return to the upper part of the hot water storage tank through a warming circulation pump and an instantaneous water heater connected to the heating circulation pump, and the hot water disposed under the hot water storage tank. When the temperature detector detects that the temperature is low, the circulating pump for heating is driven to circulate and heat the hot water in the hot water tank, and when it is detected that the hot water temperature in the lower part of the hot water tank has become high In a large capacity hot water supply device in which the circulation pump is stopped and the hot water supply line outlet pipe is taken out from the upper part of the hot water storage tank, the water supply pipe to the hot water storage tank and the outlet pipe of the heating circulation system are provided in one pipe line. An electric on-off valve that is configured and closes when a hot water temperature detector arranged above the hot water storage tank detects a decrease in hot water temperature, and a circulation direction for heating that bypasses the electric on-off valve. Is equipped with a check valve that allows the flow of water and blocks the flow in the water supply direction. A plurality of heating circulation systems each having an independent heating circulation pump and an instantaneous water heater are connected in parallel between the check valve and the water supply pipe and the upper part of the hot water storage tank. When the hot water temperature detector detects that both the upper part and the lower part of the hot water storage tank are at low temperature, the electric open / close valve is closed and all the heating circulation pumps of the plurality of heating circulation systems are driven, and the upper part of the hot water storage tank is heated to a high temperature. When it detects that the lower part is low temperature, it drives one of the heating circulation pumps for heating, and when it detects that both the upper and lower parts of the hot water tank are high temperature, the multiple heating circulation systems are detected. It is characterized in that it is equipped with a control device for stopping all the circulation pumps for heating.

[Operation] Since the present invention has the above-described configuration, when the hot water temperature detector arranged at the upper part of the hot water storage tank detects that the hot water temperature at the upper part of the hot water storage tank has dropped, the electric open / close valve is closed to store hot water. Since the water supply to the tank is stopped, the hot water heated to the predetermined temperature by the instantaneous water heater is supplied as it is through the hot water supply line outlet pipe, and at the same time, the water supply pressure is applied to the instantaneous water heater, so that the instantaneous water heater discharges water. Since the hot water is supplied simultaneously from multiple heating circulation systems with independent instant water heaters that have increased capacity and have improved hot water discharge capacity, while maintaining the hot water supply temperature at almost the desired temperature A large amount of hot water can be maintained by the warm circulation system, and during normal use when the lower part of the hot water storage tank is low temperature and the upper part is high temperature, circulation heating from one heating circulation system is performed. It can be used economically with a simple and inexpensive device.

[Embodiment] An embodiment of the large capacity water heater of the present invention will be described below with reference to FIGS. 1 to 6. FIG. 1 is a system diagram of a hot water supply apparatus to which the present invention is applied. The same parts as those in FIG. 7 are designated by the same reference numerals and the description thereof will be omitted.

In the hot water supply apparatus according to the present invention, the water supply pipe 2 to the hot water storage tank 1 and the heating circulation system outlet pipe 3'are formed of one pipe line.
In other words, the water supply pipe 2 is connected to the bottom of the hot water storage tank 1, and between the middle of the water supply pipe and the upper part of the hot water storage tank 1, there are independent heating circulation pumps 4 and instantaneous water heaters 5. A plurality of heating circulation systems 3 are connected in parallel. The illustrated embodiment shows an example in which two heating circulation systems are provided, and therefore the circulation pump for heating uses the pump 4P1 and the pump 4P2. further,
An electric opening / closing valve 15 is provided in the water supply pipe 2 and a pipe line 14 which also serves as an outlet pipe of the heating / circulation system, and the bypass pipe line 16 of the electric opening / closing valve 15 allows a flow in the heating circulation direction but supplies water. A check valve 17 is provided to prevent directional flow. In addition, hot water storage tank 1
An upper hot water temperature detector 18 is disposed on the upper part of the above, and the electric open / close valve 15 is closed when the hot water temperature detector detects that the temperature is low. Then, in the hot water supply apparatus according to the present invention, when it is detected that the lower hot water temperature detector 6 and the upper hot water temperature detector 18 are both low temperature, both pumps 4P1 and 4P2 are driven, and the upper hot water temperature detector 18 is activated. When the lower hot water temperature detector 6 detects that the temperature is high and the temperature is low, the pumps 4P1 and 4P2
If one of the pumps 4P1 and 4P2 is driven to stop when both the lower hot water temperature detector 6 and the upper hot water temperature detector 18 are detected to be at high temperature, a microcomputer (not shown) is provided. And a control device including. In this embodiment, the return pipe 10 is provided with the hot water temperature detector 19.

Next, the operation of the large-capacity water heater having the above configuration
This will be described with reference to FIGS.

FIG. 2 shows the initial state of hot water supply. In this case, the hot water in the hot water tank is circulated and heated in the same manner as in the conventional example, and the inside of the hot water tank is all at a high temperature. Therefore, the lower hot water temperature detector 6 and the upper hot water temperature detector 18 are both hot. To detect that there is
When both the pumps 4P1 and 4P2 are stopped and the hot water tap 8 is opened, hot water is supplied from the hot water tap 1 from the hot water tank 1 via the hot water supply line 7 as shown by the thick line, and accordingly, from the water supply pipe 2 to the hot water tank. Is supplied to the bottom of the. At this time, as shown in the flow 101 of the flowchart in FIG. 6, the control device opens the hot water tap 8, the upper hot water temperature detector 18 sets the temperature 2DET higher than the set temperature T2, and the lower hot water temperature detector 6 sets Since the hot water temperature T1DET higher than the set temperature T1 is detected, the electric open / close valve 15
The water is supplied from the water source corresponding to the hot water supply from the hot water tap 8 to the hot water storage tank 1 through the water supply valve 2 ′ and the electric opening / closing valve 15 while keeping the pump open and operating neither of the pumps 4P1 and 4P2. Water is supplied by the water supply pressure.

FIG. 3 shows a state in the middle of hot water supply in which the lower hot water temperature detector 6 has detected that the temperature is low by raising the low temperature region by continuously or intermittently supplying hot water as described above. In this case, since the upper hot water temperature detector 18 detects a high temperature and the lower hot water temperature detector 6 detects a low temperature, the pumps 4P1 and 4P2 are detected.
Either one of them, for example, the pump 4P1 is driven to supply hot water in the hot water storage tank 1 while circulatingly heating the hot water in the hot water storage tank 1 as shown by the thick line, and at the same time, water is supplied from the water supply pipe 2 into the hot water storage tank as much as the hot water decreases. To replenish.

The controller opens the hot water tap 8 and the upper hot water temperature detector 18 detects the temperature T2DET higher than the set temperature T2. Therefore, the electric open / close valve 15 is kept open, and the lower hot water temperature detector 6 is Since the temperature D1DET lower than the set temperature T1 is detected,
As shown in the flow 102 of FIG. 6, only one pump 4P1 is operated and only the instantaneous water heater 5 of the heating circulation system corresponding to this pump is burned to circulate and heat the hot water in the hot water storage tank 1. Meanwhile, hot water is supplied by the water supply pressure passing through the electrically operated on-off valve 15. After that, the lower hot water temperature detector 6 detects the temperature T1DE higher than the set temperature T1.
When it comes to detect T, since the upper hot water temperature detector 18 has already detected the temperature T2DET higher than the set temperature T2,
The control device stops the pump 4P1 while keeping the electric opening / closing valve 15 open. Then, the lower hot water temperature detector 6 is again set to the set temperature.
When the temperature T1DET lower than T1 is detected, the control device activates only one pump 4P1.

FIG. 4 shows a state in which the low temperature region has risen to the position of the upper hot water temperature detector 18 due to continuous use of hot water supply or the like. In this case, since both the lower hot water temperature detector 6 and the upper hot water temperature detector 18 have detected low temperatures, both pumps 4P1 and 4P2 are driven and the electrically operated on-off valve 15 is closed. In this state, the water supply pipe 2 and the hot water storage tank 1 are shut off by closing the electric opening / closing valve 15, so that the instantaneous water heaters 5 of the plurality of heating circulation systems are supplied with the pressure and the pressure by the pumps 4P1 or 4P2. Water pressure is applied, and the hot water discharge capacity of any instant water heater rises, and the warm water drawn from the lower part of the hot water tank 1 and the water supplied from the water supply pipe 2 are heated by both heating circulation systems. The hot water supplied to the upper part of the hot water storage tank 1 and thus the hot water supplied to the upper part of the hot water storage tank 1 is discharged as it is through the hot water supply line 7. In this case, since the hot water storage tank 1 is not supplied with water, the water in the hot water storage tank 1 and the hot water supplied from the respective instantaneous water heaters 5 hardly mix, and the instantaneous hot water is supplied by the water supply pressure as described above. As the capacity of the water heater 5 increases, a total amount of hot water is supplied from the instantaneous water heaters of the plurality of heating circulation systems, so that the hot water supply temperature is maintained at almost the desired temperature, and the hot water can be discharged from a plurality of hot water taps. A large amount of hot water can be provided, which is sufficient.

In the control device, hot water is continuously discharged from the hot water tap 8, and the upper hot water temperature detector 18 sets the set temperature T2 as shown in the flow 103 of FIG.
When the lower temperature T2DET is detected, the electric on-off valve 15 is closed to stop the water supply from the water supply pipe to the hot water storage tank 1, and the lower hot water temperature detector 6 already has a temperature lower than the set temperature T _1. Since T1DET is detected, both pumps 4P1 and 4P
2 is operated, and the instantaneous water heaters 5 of both heating and circulation systems heat the hot water from the hot water tank 1 that has passed through the check valve 5 by the capacity of the water supply pressure from the water supply pipe 2 and the pump pressure. Is supplied to the upper part of the hot water storage tank 1 and is discharged from the hot water supply line 7.

FIG. 5 shows a state in which both the lower hot water temperature detector 6 and the upper hot water temperature detector 18 detect low temperatures, but both hot water taps are closed and heating is being performed. In this case, drive the heating circulation pumps 4P1 and 4P2 of all heating circulation systems
The warm water in the inside is circulated and heated, and the circulation pump 13 for immediate hot water is driven so that the hot water of an appropriate temperature can be immediately obtained by opening the hot water tap 8. At this time, the control device executes the flow 10 of FIG.
4, the hot water tap 8 is closed, the upper hot water temperature detector 18 detects a temperature T2DET lower than the set temperature T2, and the lower hot water temperature detector 6 also detects a temperature T1DET lower than the set temperature T1. Therefore, the motorized on-off valve 15 is closed and both pumps 4P1 and 4
P2 is operated, the hot water in the hot water storage tank 1 is circulated to both heating circulation systems through the check valve 17, and both instantaneous water heaters 5 heat this circulating hot water. Also in this case, since the water supply pressure is applied to both the instantaneous water heaters, the hot water discharge capacity can be improved.

[Effects of the Invention] As described above, according to the present invention, in a large-capacity water heater having a hot water storage tank, even if all the hot water in the hot water storage tank is replaced by water due to continuous use of hot water, etc. It is possible to prevent a decrease in the amount of hot water and maintain a large amount of hot water as the total amount of hot water heated by all the instantaneous water heaters of the multiple heating circulation systems that have improved hot water discharge capacity, and normal operation is possible. At times, there is an effect that it can be economically used by operating one system of heating and circulating system.

[Brief description of drawings]

FIG. 1 is a system diagram of a large capacity hot water supply apparatus showing an embodiment of the present invention, FIG. 2 is an explanatory view showing an initial state of hot water supply, FIG. 3 is an explanatory view showing an intermediate state of hot water supply, and FIG. Is an explanatory view showing a state where the low temperature region has risen, FIG. 5 is an explanatory view showing a state at a low temperature and instant hot water, and FIG. 6 is a flow chart showing a control content. FIG. 7 is a system diagram of a conventional large-capacity hot water supply apparatus, and FIG. 8 is a diagram showing changes in hot water supply temperature of a conventional example. 1 ... Hot water storage tank, 2 ... Water supply pipe, 3 ... Heating circulation system, 4P1,
4P2 …… Circulating pump for heating, 5 …… Instant water heater, 6 ……
Lower hot water temperature detector, 7 …… hot water supply line, 8 …… hot water tap, 14
...... Pipe line that doubles as a water supply pipe and a heating circulation system outlet pipe, 15 ……
Electric open / close valve, 17 …… Check valve, 18 …… Upper hot water temperature detector.

Front Page Continuation (72) Inventor Yoshiaki Izumi 1-5-5 Chuorinkan, Yamato-shi, Kanagawa Pearl Heights No. 101 (56) References: Kaikaihei 2-62357 (JP, U)

Claims (1)

[Claims] 1. A water supply pipe and an outlet pipe of a heating circulation system are connected to the bottom of a sealed hot water storage tank, and the heating circulation system is the moment when the heating circulation pump and the heating circulation pump are connected. When the hot water temperature detector installed in the lower part of the hot water storage tank detects that the temperature is low, it is driven by the circulation pump for heating and the inside of the hot water storage tank is installed. When the hot water of the lower part of the hot water storage tank is detected to have become hot, the heating circulation pump is stopped and the hot water supply line outlet pipe is taken out from the upper part of the hot water storage tank. In the device, the water supply pipe to the hot water storage tank and the outlet pipe of the heating circulation system are constituted by one pipe line, and a hot water temperature detector arranged at the upper part of the hot water storage tank is provided in the pipe line. An electric open / close valve that closes when a drop in hot water temperature is detected, and a flow in the circulation direction for heating is allowed by bypassing the electric open / close valve. In addition, a check valve that blocks the flow in the water supply direction is installed, and each independent heating circulation is provided between the electric open / close valve and the check valve, the water supply pipe and the upper part of the hot water tank. A plurality of heating and circulation systems having a pump and an instantaneous water heater are connected in parallel, and when the hot water temperature detector detects that both the upper and lower portions of the hot water storage tank are low in temperature, the electric open / close valve is closed and When all the heating circulation pumps of the heating circulation system are driven and it is detected that the upper part of the hot water storage tank is hot and the lower part is low temperature, one of the heating circulation pumps of multiple heating circulation systems is activated. A high-capacity water heater equipped with a control device that stops all heating circulation pumps of a plurality of heating circulation systems when it is driven and it is detected that the upper and lower portions of the hot water storage tank are at high temperatures.