JPH06265212A - Hot water feeding system - Google Patents

Abstract

PURPOSE:To reduce an operating expenditure and to enable a hot water to be fed out at once by a method wherein there are provided a first circulating passage formed by a hot water storing tank and a heating means, and a second circulation passage formed by a hot water feeding pipe for supplying hot water to an external part and a heat exchanger. CONSTITUTION:When a passage in a three-way valve 8 is set such that a downsteam side of a circulation pump 7 and a connecting pipe 9 are connected to each other, a first passage is formed in a passage ranging from a flowing-out port 3 of a final stage hot water storing tank 1e to an outlet port 2 of a final stage hot water storing tank 1a through the circulation pump 7, the three-way valve 8 and a connecting pipe 9. A passage for the three-way valve 8 is set such that the downstream side of the circulation pump 7 and a hot water feeding pipe 11 are connected from each other, and when an opening or closing valve 15 is opened, the second passage is formed. Since there are provided these changing-over means, a heating cycle operation and a heat collecting cycle operation can be easily carried out and an effect for preventing reduction in hot water temperature can be attained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circulating hot water supply system which is capable of being heated and quickly converted into hot water.

[0002]

2. Description of the Related Art Generally, as a hot water supply system for a detached house or an apartment house, there are a hot water supply system that uses a midnight electric heater as a heating device and a hot pump system that stores hot water in a hot water storage tank to supply hot water. In these, the hot water storage tank is of multiple hot water storage tank type, and further, the temperature drop of hot water due to heat radiation in the hot water supply pipe is prevented, and hot water can be immediately discharged when the hot water tap is opened. Conventionally, many hot water supply systems have been proposed in which hot water is supplied by circulating water.

Conventionally, as a plurality of hot water storage tank systems of this type, there are a hot water storage tank having a water supply port at the lower end and a hot water supply port at the upper end, and a hot water supply port at the upper end with the hot water supply port at the upper end of the hot water storage tank. A small capacity auxiliary tank having a water intake port and a water supply port formed at the lower end side is connected, and a three-way valve, a circulation pump, and a condenser of a heat pump device are provided between the water intake port and the water supply port of the auxiliary tank. A heat exchanger for hot water supply that functions as a hot water supply is provided, and the water supply port of the hot water storage tank is connected to the other side of the three-way valve.The connection state of the pump to the water intake side of the auxiliary tank and that of the hot water storage tank are connected to the other side of the three-way valve. By switching between the water inlet side and the hot water heat exchanger, the hot water in the auxiliary tank heated by the heat of condensation given to the circulating hot water from the auxiliary tank is transferred to the upper side of the hot water storage tank. And switch this The hot water is stored in order from the upper side of the hot water storage tank by repeating the above steps.Furthermore, the hot water storage tank is connected to each hot water inlet side and each hot water inlet side through open / close valves, and each hot water storage tank is connected in parallel with each other. There is a configuration (Japanese Patent Laid-Open No. 1-163553) (hereinafter, simply referred to as Conventional Example 1).

Further, as a similar one, Japanese Patent Laid-Open Publication No.
There is a publication of 163555 (hereinafter, simply referred to as Conventional Example 2). The configurations of Conventional Examples 1 and 2 are the hot water storage tanks, a plurality of hot water storage tanks connected in parallel with each other through open / close valves on the respective hot water supply port sides and respective water supply port sides, and an auxiliary tank separate from the hot water storage tanks. It is a configuration in which are connected in parallel. The operation is to heat the hot water in the auxiliary tank with the heat exchanger for hot water supply of the heat pump device, transfer the hot water to the upper side of the hot water storage tank, and move the water under the hot water storage tank to the auxiliary tank, Hot water is accumulated in sequence from the upper part of the hot water storage tank while repeating the above operation. Although this process is performed for all hot water storage tanks, as described above, an open / close valve is provided for each of a plurality of hot water storage tanks to sequentially switch between open and close for storage.

Further, as a plurality of hot water storage tank systems of this type, a plurality of tanks for storing hot water and a heating device (heater) are provided in each of the plurality of tanks to supply hot water to each tank. There is one in which boiling water is heated to a set temperature to supply hot water (Japanese Patent Application Laid-Open No. 4-24469) (hereinafter, simply referred to as Conventional Example 3). In Conventional Example 3, each hot water storage tank is equipped with a heating device (heater) to boil the hot water supplied to each tank to a set temperature.

Separately from this, as a device intended for immediate hot water supply, a main pipe extending from the hot water storage tank and a branch pipe connected to a branch portion provided in the main pipe and having a faucet attached to the other end are provided. It is composed of a hot water supply pipe including it and a return pipe returning to the hot water storage tank, and the hot water supply pipe and the return pipe are connected at the faucet side end of the branch pipe and circulated by a pump (Japanese Patent Laid-Open No. Hei 4).
No. 453324) (hereinafter, simply referred to as Conventional Example 4).
Note).

Furthermore, a terminal comprising a hot water supply pipe and a regulating valve consisting of a hot water supply side and a water side constriction connected to the hot water supply heat source device, a hot water supply pipe, and a tank equipped with a heater for heating the stored water. There is a hot water supply device (Japanese Patent Publication No. 3-56372) in which a hot water supply device such as a heater of the terminal hot water supply device is used (hereinafter simply referred to as Conventional Example 5). The structure is shown in FIG. In the figure, 31
Is a hot water supply heat source device, 32 is a terminal hot water supply device, 37 is a control valve including a hot water side valve 35 and a water side valve 36, and 40 is a control valve including a hot water side throttle portion 38 and a water side throttle portion 39. Four
A hot water storage tank 5 has a sheathed heater 48 inside to warm the hot water. Hot water from the heat source device 31 and water from the water side valve are supplied to the faucet portion 52 via the primary mixing point 50 and further via the secondary mixing point 51. This operation is as follows. Hot water from the heat source 31 passes through the control valve 35 and enters the hot water storage tank 45. When it is heated here and the faucet 52 is opened, the hot water throttle 38 and the water throttle 3 of the control valve are opened.
With 9, the hot water of suitable temperature can be obtained. In Conventional Example 5, from a hot water storage tank equipped with a hot water supply pipe and a water supply pipe connected to a hot water supply pipe and a water supply pipe, a regulating valve including a hot water side and a water side throttle portion, a hot water pipe for taking out hot water, and a heater for heating the hot water. It consists of the following terminal hot water supply device, and this independent terminal hot water supply device is used for instant hot water supply.

[0008]

In the conventional examples 1 and 2, an opening / closing valve must be provided for each of the hot water storage tanks of the plurality of hot water storage tanks, and the opening / closing valve of each hot water storage tank is repeatedly opened and closed. A cumbersome operation is required, such as having to perform the above steps for each hot water storage tank.
In Conventional Example 3, each hot water storage tank must be equipped with a heater, resulting in a large facility electric capacity and running costs. In Conventional Example 4, when the hot water supply pipe and the return pipe are connected at the faucet side end of the branch pipe and the faucet is closed, the hot water from the hot water tank is pumped from the main pipe through the branch pipe when the faucet is closed. It flows into the return pipe near the stopper and is returned to the hot water storage tank again. As a result, hot water always exists near the faucet, but it has a hot water supply pipe, a branch pipe, a return pipe, and the structure of these pipe systems is complicated. In the conventional example 5, the hot water supply heat source device and each independent terminal hot water supply device are used to instantly make hot water, and when hot water is to be supplied in multiple places, the equipment becomes large and the equipment cost increases. As described above, the conventional one has the above-mentioned problems.

The present invention has been made in order to solve the above-mentioned problems, and aims at space saving of a hot water storage tank and reduction of operating cost by a heat pump heat source and an electric heater for late-night power, and when using hot water immediately. The purpose is to provide a convenient hot water supply system that can be used.

[0010]

A hot water supply system according to the present invention includes a plurality of hot water storage tanks connected by connecting pipes, a heat exchanger provided in at least one of the hot water storage tanks, and the hot water storage tanks and heating. A first circulation path formed by means, a second circulation path formed by the hot water supply pipe for supplying hot water to the outside and the heat exchanger, the first circulation path and the second circulation path. And a means for switching. The hot water supply system according to the invention of claim 2 includes a plurality of hot water storage tanks connected by connecting pipes.
A heat exchanger provided in at least one of the hot water storage tanks, a first circulation path forming a heating cycle by the hot water storage tank and a heating means provided in at least one of the hot water storage tanks, and hot water to the outside. A second circulation path that forms a heat collection cycle with a hot water supply pipe that supplies heat and the heat exchanger, a means that switches from the first circulation path to the second circulation path after heating is finished, and circulation of hot water It was equipped with a circulation means.

The hot water supply system according to a third aspect of the present invention is the hot water supply system according to the first or second aspect, wherein the circulating means is forced to intermittently operate when the hot water is not used outside. A hot water supply system according to a fourth aspect of the invention is the invention according to the first or second aspect, in which the first circulation path and the second circulation path are switched by a common circulation means for circulation.
Further, the hot water supply system of the invention of claim 5 is the invention of claim 1 or 2, wherein the first circulation path is from the outlet side of the final hot water tank connected to the hot water supply pipe for supplying hot water to the heating means side. A circulation path including a connecting pipe is provided, and the plurality of hot water storage tanks are heated while circulating hot water.

[0012]

In the hot water supply system according to the present invention, the hot water is sequentially stored in the plurality of hot water storage tanks by the first heating circulation path, and the hot water is supplied from the warm water even when the hot water is being used. When boiled, it switches to the heat retention system by the heat exchanger in the hot water storage tank so as not to cause discomfort when using hot water outside. The inventions of claims 3 to 5 further circulate by intermittent operation, or circulate by the same pump,
Alternatively, the hot water is boiled in the circulation path from the hot water supply pipe side of the plurality of hot water storage tanks.

[0013]

【Example】

Example 1. The hot water supply system according to the present invention will be described below with reference to embodiments. FIG. 1 is a configuration diagram showing a hot water supply system according to an embodiment of the present invention. In the figure, 1a to 1
e is a hot water storage tank. An inlet 2 and an outlet 3 are formed on the upper end side of the hot water storage tanks 1a to 1e,
An inflow pipe 4 having one end extending to the vicinity of the lower end of the inside of the hot water storage tanks 1a to 1e is arranged at the inflow port 2. Reference numeral 5 is a connecting pipe that connects the outflow port 3 and the inflow port 2 of the adjacent hot water storage tanks 1a to 1e, and 6 is connected to the inflow port 2 of the first-stage hot water storage tank 1a of the hot water storage tanks 1a to 1e. It is a water supply pipe. Reference numeral 7 denotes a circulation pump connected to the outlet 3 side of the final-stage hot water storage tank 1e of the hot water storage tanks 1a to 1e.
Is a three-way valve connected to the downstream side of the circulation pump 7. Reference numeral 9 is a connecting pipe connecting one port of the three-way valve 8 and the inlet 2 of the first-stage hot water storage tank 1a, and 10 is a heat exchanger arranged in the hot water storage tank 1 (1c in the figure). 11
Is connected to the inflow port 12 of the heat exchanger 10 by a hot water supply pipe connected to the other port of the three-way valve 8. Reference numeral 13 denotes the outlet 14 of the heat exchanger 10 and the final-stage hot water storage tank 1e.
An on-off valve 15 that opens and closes the flow path is provided in the middle of the connecting pipe connecting the outflow port 3 side and the circulation pump 7.

When the flow path of the three-way valve 8 is connected to the downstream side of the circulation pump 7 and the connection pipe 9, the circulation pump 7 is connected from the outlet 3 of the hot water storage tank 1e at the final stage. A cycle path (first system path) is formed through the three-way valve 8 and the connecting pipe 9 to reach the inflow port 2 of the first-stage hot water storage tank 1a. In addition, when the flow path of the three-way valve 8 is connected to the downstream side of the circulation pump 7 and the hot water supply pipe 11 and the opening / closing valve 15 is opened, the connection pipe from the outlet 14 of the heat exchanger 10 is connected. 13 through the circulation pump 7, the three-way valve 8 and the hot water supply pipe 11 to reach the inflow port 12 of the heat exchanger 10 (cycle II).
A line) is formed. Reference numeral 16 denotes a hot water supply heat exchanger arranged in the hot water storage tank 1 (1a in the figure) as a first heating means. This acts as a condenser in the refrigeration cycle, and is connected by a refrigerant pipe 18 to a heat pump device 17 composed of a compressor, an evaporator, a pressure reducing mechanism and the like (not shown). That is, the refrigerant circulation is performed by operating the compressor of the heat pump device 17,
At this time, the refrigerant is condensed in the hot water supply heat exchanger 16, and the heat of condensation is applied to the hot water circulating in the hot water storage tank 1 (1a in the figure) to heat the hot water.

Numeral 19 is an electric heater for late-night power, which is provided in the hot water storage tank 1 (1b in the figure) as a second heating means. Reference numeral 20 denotes a mixed faucet to which a hot water supply pipe 21 connected to the hot water supply pipe 11 and a water supply pipe 6 are connected, and 22 denotes the outlet 3 provided in a pipe in the vicinity of the outlet 3 of the hot water storage tank 1e at the final stage. A hot water temperature detecting means for detecting the temperature of hot water flowing out from the hot water. The reference numeral 23 designates the start / stop of the heat pump device 17 of the first heating means, the energization control to the electric heater 19 for the midnight power of the second heating means, and the circulation pump 7 based on the temperature detected by the hot water temperature detecting means 22. It is a control device that controls the start and stop of the vehicle. The above-mentioned system I path is a heating cycle operation system path for heating and storing the heated water to a predetermined temperature by the above heating means 16 and 19 while circulating hot water, and the above-mentioned system II path uses hot water. When not, the hot water in the hot water supply pipe 11 is circulated by the intermittent operation of the circulation pump 7 or the like to be exchanged with the hot water in the hot water storage tank 1c by the heat exchanger 10 to reduce the hot water temperature in the pipe. This is a heat collection cycle operation system path for prevention.

Next, the operation of the hot water supply system configured as described above will be described with reference to FIGS. First, a heating cycle operation operation in a hot water supply system according to an embodiment of the present invention will be described based on a heating cycle operation state diagram of FIG. 2 and a flowchart showing a control operation during the heating cycle operation of FIG. In this hot water supply system, the heating cycle operation is basically performed by using a heat pump heat source and a low-price electric heater for late-night power to store hot water for the next day at night in a hot water storage tank. First, in step S1, the control device 23 sets the time of the timer at the initial stage. Next, step S2
In step S3, it is determined whether or not it is in the midnight time zone (from 23:00 to 7:00). If it is in the midnight time zone, the three-way valve 8 is switched to the heating cycle operation side in the next step S3. As a result, as shown in FIG. 2, the flow path of the three-way valve 8 is connected to the downstream side of the circulation pump 7 and the connection pipe 9, and the circulation pump 7 is discharged from the outlet 3 of the final-stage hot water storage tank 1e. Through the three-way valve 8 and the connection pipe 9, a cycle system path (first system path) is formed to reach the inflow port 2 of the first-stage hot water storage tank 1a.

Next, in step S4, an operation command is issued to the circulation pump 7 to circulate the hot and cold water indicated by the solid line in FIG. Subsequently, in step S5, a pipe provided near the outlet 3 of the hot water storage tank 1e at the final stage is provided.
The temperature detected by the hot water temperature detecting means 22 (for example, a thermistor) that detects the temperature of the hot water flowing out from the outlet 3 is determined with respect to the preset first target temperature T1. For example, the hot water temperature of 40 ° C. is set as the first target temperature T1 in advance, and the heat pump device 17 of the first heating means heats up to 40 ° C., and the hot water temperature of 60 ° C. is set as the second target temperature T2. C. to 60.degree. C. is heated by the electric heater 19 for the midnight power of the second heating means. Here, if the detected temperature has not reached the first target temperature T1, the operation command is issued to the heat pump device 17 of the first heating means in step S6.
By the operation of the heat pump device 17, the heat of condensation of the refrigerant is applied to the hot and cold water circulating in the hot water storage tank 1a in the hot water supply heat exchanger 16 to heat the hot and cold water. Then, in step S7, it is determined whether or not the detected temperature has reached the first target temperature T1. If not, the process returns to step S6.

Here, when the detected temperature reaches the first target temperature T1, in step S8, the heat pump device 17
To the electric heater 19 for the midnight electric power of the second heating means in step S9. The hot water is further heated by the electric heater 19 for midnight power. And step S
In 10, it is determined whether or not the detected temperature has reached the second target temperature T2. If not, the process returns to step S9. Here, when the detected temperature reaches the second target temperature T2, in step S11, the electric heater 1 for midnight power is used.
A power supply stop command is issued to 9, and step S1
In 2, a stop command is issued to the circulation pump 7 to end the heating cycle operation. After that, the flow path of the three-way valve 8 is switched to a state in which the downstream side of the circulation pump 7 and the hot water supply pipe 11 are connected to stand by in a state in which the heat collection cycle operation operation and the hot water supply operation are possible. If the faucet is opened during the heating cycle, the faucet-side supply end of the heating cycle is at a high temperature and hot water can be supplied.

Next, the operation state of the heat collection cycle operation of the hot water supply system in one embodiment of the present invention will be described with reference to FIG. When the mixed faucet 20 is not opened (hot water is not used (hot water is supplied)), the cold water in the hot water supply pipe 11 is lowered, and when the mixed faucet 20 is opened later, cold hot water may not come out. It gives a pleasant feeling. To prevent this, in order not to cause this discomfort, the on-off valve 15 is opened even when hot water is not used, and the outlet 14 of the heat exchanger 10 provided in the hot water storage tank 1c is connected to the connecting pipe 13 And the circulation pump 7, the three-way valve 8 and the hot water supply pipe 11 to reach the inflow port 12 of the heat exchanger 10 (cycle II)
Form a line). The hot water in the hot water supply pipe 11 is circulated by the operation of the circulation pump 7, and heat is exchanged with the hot water in the hot water storage tank 1c by the heat exchanger 10 to prevent a decrease in the hot water temperature in the hot water supply pipe 11 and prepare for hot water supply. . Therefore, the quick hot water property at the time of hot water supply is improved.

Next, a hot water supply operation state in the hot water supply system according to the embodiment of the present invention will be described with reference to FIG. When the mixed faucet 20 is opened (hot water is used (hot water is supplied)), the opening / closing valve 15 is closed and the hot water is stored in the hot water storage tanks 1a to 1e by the water pressure of the tap water acting through the water supply pipe 6. The hot water flowing out flows upward, passes through the circulation pump 7, the three-way valve 8, the hot water supply pipe 11, and the hot water supply pipe 21, and is mixed with the water from the water supply pipe 6 at the mixing faucet 20 to generate hot water of an appropriate temperature. It

Example 2. In the above examples, the circulation operation of the heat collection cycle was not mentioned. This circulation operation may be performed intermittently by a timer or the like, that is, the circulation operation may be performed before the morning and evening hours when hot water is used. In this way, energy can be saved.

Example 3. In the above embodiment, only one circulation pump was used and it was shared by the heating cycle and the heat collection cycle. These may be installed at different places in each system using separate pumps.

[0023]

As described above, according to the present invention, a plurality of hot water storage tanks, a first circulation path including heating means in one of the hot water storage tanks, and a heat exchanger in one of the hot water storage tanks. Since the second circulation path including the and the means for switching between them are provided, warm water can be supplied even when using the hot water in a small space, and even after the hot water is boiled, there is no need for an active element such as a heater. It has the effect of constantly supplying warm water. Further, the inventions of claims 3 to 5 have the effects of further saving energy, saving equipment, and improving the quick hot water property during hot water supply.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a hot water supply system according to an embodiment of the present invention.

FIG. 2 is a heating cycle operation state diagram in the hot water supply system according to the embodiment of the present invention.

FIG. 3 is a flowchart illustrating a control operation during a heating cycle operation.

FIG. 4 is an operation state diagram of a heat collection cycle operation in the hot water supply system according to the embodiment of the present invention.

FIG. 5 is a hot water supply operation state diagram in the hot water supply system according to the embodiment of the present invention.

FIG. 6 is a diagram showing a configuration of a conventional hot water supply system.

[Explanation of symbols]

 1a to 1e Hot water storage tank 5 Connection pipe 6 Water supply pipe 7 Circulation pump 8 Three-way valve 10 Heat exchanger 11 Hot water supply pipe 16 Hot water supply heat exchanger 17 Heat pump device 19 Midnight electric heater 20 Mixed water faucet 22 Hot water temperature detection means 23 Control apparatus

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[Procedure amendment]

[Submission date] July 21, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Claim 5

[Correction method] Change

[Correction content]

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction content]

Further, a terminal hot water supply including a hot water supply pipe and a regulating valve having a hot water supply side and a water side throttle connected to the hot water supply heat source device, a hot water supply pipe for taking out the hot water, and a tank having a heater for heating the stored water. There is a device (a Japanese Patent Publication No. 3-56372) in which a hot water supply device such as a heater is used for the terminal water heater (hereinafter, simply referred to as Conventional Example 5). The structure is shown in FIG. In the figure, 3
Reference numeral 1 is a hot water supply heat source device, 32 is a terminal hot water supply device, 37 is a control valve including a hot water side valve 35 and a water side valve 36, and 40 is a control valve including a hot water side throttle portion 38 and a water side throttle portion 39.
45 is a hot water storage tank, and there is a sheath heater 48 inside,
The hot water is warming up. Hot water from the heat source device 31 and water from the water-side valve pass through the primary mixing point 50, and then the secondary mixing point 51.
It is supplied to the faucet part 52 via. This operation is as follows. Hot water from the heat source 31 passes through the control valve 35 and enters the hot water storage tank 45. Heated here, faucet 52
When the valve is opened, hot water at a proper temperature can be obtained by the hot water throttle 38 and the water throttle 39 of the control valve. In Conventional Example 5, from a hot water storage tank equipped with a hot water supply pipe and a water supply pipe connected to a hot water supply pipe and a water supply pipe, a regulating valve including a hot water side and a water side throttle portion, a hot water pipe for taking out hot water, and a heater for heating the hot water. It consists of the following terminal hot water supply device, and this independent terminal hot water supply device is used for instant hot water supply.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

[Correction content]

The hot water supply system according to a third aspect of the present invention is the hot water supply system according to the first or second aspect, wherein the circulating means is forced to intermittently operate when the hot water is not used outside. A hot water supply system according to a fourth aspect of the invention is the invention according to the first or second aspect, in which the first circulation path and the second circulation path are switched by a common circulation means for circulation.
Further, the hot water supply system of the invention of claim 5 is the invention of claim 1 or 2, wherein the first circulation path is from the outlet side of the final hot water tank connected to the hot water supply pipe for supplying hot water to the heating means side. A circulation path including a connection pipe is provided so that the hot water in the plurality of hot water storage tanks is circulated and heated.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0012

[Correction method] Change

[Correction content]

[0012]

[Action] hot water system in the present invention, Ri by the first heating circulation path, it continues hot water stored in the plurality of hot-water tank, was or <br/>, the water boils, when using hot water in the external In order not to give discomfort to the user, the second circulation path is switched by the heat exchanger in the hot water storage tank. The invention according to claims 3 to 5 further circulates in intermittent operation, circulates by the same pump, or the like, or hot water is boiled in a circulation path from the hot water supply pipe side of a plurality of hot water storage tanks.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0013

[Correction method] Change

[Correction content]

[0013]

EXAMPLES Example 1. The hot water supply system according to the present invention will be described below with reference to embodiments. FIG. 1 is a configuration diagram showing a hot water supply system according to an embodiment of the present invention. In the figure, 1a to 1
e is a hot water storage tank, five of which are shown in this figure. The hot water storage tanks 1a to 1e are formed with an inflow port 2 and an outflow port 3 on the upper end side, and an inflow pipe 4 having one end extending to the vicinity of the inner lower end of the hot water storage tanks 1a to 1e is arranged at the inflow port 2. Has been done. Reference numeral 5 is a connecting pipe for connecting the outflow port 3 and the inflow port 2 of the adjacent hot water storage tanks 1a to 1e, and 6 is the inflow port 2 of the first hot water storage tank 1a of the hot water storage tanks 1a to 1e.
Is a water supply pipe connected to. 7 is a hot water storage tank 1a-
A circulation pump connected to the outlet 3 side of the hot water storage tank 1e at the final stage of 1e, and 8 is a three-way valve connected to the downstream side of the circulation pump 7. Reference numeral 9 is a connecting pipe connecting one port of the three-way valve 8 and the inlet 2 of the first-stage hot water storage tank 1a, and 10 is a heat exchanger arranged in the hot water storage tank 1 (1c in the figure). Reference numeral 11 is a hot water supply pipe connected to the other opening of the three-way valve 8 and is connected to an inlet 12 of the heat exchanger 10. Reference numeral 13 is a connection pipe that connects the outlet 14 of the heat exchanger 10 and the outlet 3 side of the hot water storage tank 1e at the final stage and the circulation pump 7, and an on-off valve that opens and closes the flow path midway. 15 are arranged.

[Procedure correction 6]

[Document name to be amended] Statement

[Name of item to be corrected] 0015

[Correction method] Change

[Correction content]

Numeral 19 is an electric heater for late-night power, which is provided in the hot water storage tank 1 (1b in the figure) as a second heating means. Reference numeral 20 denotes a mixed faucet to which a hot water supply pipe 21 connected to the hot water supply pipe 11 and a water supply pipe 6 are connected, and 22 denotes the outlet 3 provided in a pipe in the vicinity of the outlet 3 of the hot water storage tank 1e at the final stage. A hot water temperature detecting means for detecting the temperature of hot water flowing out from the hot water. The reference numeral 23 designates the start / stop of the heat pump device 17 of the first heating means, the energization control to the electric heater 19 for the midnight power of the second heating means, and the circulation pump 7 based on the temperature detected by the hot water temperature detecting means 22. It is a control device that controls the start and stop of the vehicle. The above-mentioned system I path is a heating cycle operation system path for heating and storing the heated water to a predetermined temperature by the above heating means 16 and 19 while circulating hot water, and the above-mentioned system II path uses hot water. When not being performed, the hot water in the hot water supply pipe 11 is circulated by the intermittent operation of the circulation pump 7 and the like, and heat is exchanged with the hot water in the hot water storage tank 1c by the heat exchanger 10 to lower the hot water temperature in the pipe. This is a heat collection cycle operation system path for preventing the above.

[Procedure Amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0018

[Correction method] Change

[Correction content]

Here, when the detected temperature reaches the first target temperature T1, in step S8, the heat pump device 17
To the electric heater 19 for the midnight electric power of the second heating means in step S9. The hot water is further heated by the electric heater 19 for midnight power. And step S
In 10, it is determined whether or not the detected temperature has reached the second target temperature T2. If not, the process returns to step S9. Here, when the detected temperature reaches the second target temperature T2, in step S11, the electric heater 1 for midnight power is used.
A power supply stop command is issued to 9, and step S1
In 2, a stop command is issued to the circulation pump 7 to end the heating cycle operation. After that, the flow path of the three-way valve 8 is switched to a state in which the downstream side of the circulation pump 7 and the hot water supply pipe 11 are connected to stand by in a state in which the heat collection cycle operation operation and the hot water supply operation are possible. If the faucet is opened during the heating cycle, the faucet side of the heating cycle
Hot water can be supplied from the supply end .

[Procedure Amendment 8]

[Document name to be amended] Statement

[Correction target item name] 0019

[Correction method] Change

[Correction content]

Next, the operation state of the heat collection cycle operation of the hot water supply system in one embodiment of the present invention will be described with reference to FIG. When the mixed faucet 20 is not opened (hot water is not used (hot water is supplied)), the cold water in the hot water supply pipe 11 is lowered, and when the mixed faucet 20 is opened later, cold hot water may not come out. It gives a pleasant feeling. To prevent this, so as not to give the uncomfortable feeling, and an open closed 15 when hot water is not being used to open the connection pipe from the outlet 14 of the heat exchanger 10 provided in the hot water storage tank 1c 13 A circulation system path (second system path) is formed between the circulation pump 7, the three-way valve 8 and the hot water supply pipe 11 to reach the inflow port 12 of the heat exchanger 10. The hot water in the hot water supply pipe 11 is circulated by the operation of the circulation pump 7, and heat is exchanged with the hot water in the hot water storage tank 1c by the heat exchanger 10 to prevent a decrease in the hot water temperature in the hot water supply pipe 11 and prepare for hot water supply. . Therefore, the quick hot water property at the time of hot water supply is improved.

[Procedure Amendment 9]

[Document name to be amended] Statement

[Name of item to be corrected] 0023

[Correction method] Change

[Correction content]

[0023]

As described above, according to the present invention, a plurality of hot water storage tanks, a first circulation path including heating means in one of the hot water storage tanks, and a heat exchanger in one of the hot water storage tanks. a second circulation path including the so and means for switching these, pressurized
Heat cycle operation and heat collection cycle operation can be performed easily,
Furthermore, with these simple configurations,
This has the effect of preventing a decrease in hot water temperature in the hot water supply pipe. Further, the inventions of claims 3 to 5 have the effects of further saving energy, saving equipment, and improving the quick hot water property during hot water supply.

[Procedure Amendment 10]

[Document name to be amended] Statement

[Name of item to be corrected] Figure 3

[Correction method] Change

[Correction content]

FIG. 3 is a flow chart showing a control operation during a heating cycle operation.
It is a chart .

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Claims (5)

[Claims] 1. A plurality of hot water storage tanks connected by connecting pipes, a heat exchanger provided in at least one of the hot water storage tanks, and a first circulation path formed by the hot water storage tank and heating means. A second circulation path formed by a hot water supply pipe for supplying hot water to the outside and the heat exchanger, a means for switching between the first circulation path and the second circulation path, and a circulation means for circulating hot water. Hot water supply system equipped with. 2. A plurality of hot water storage tanks connected by connecting pipes, a heat exchanger provided in at least one of the hot water storage tanks, and a heating means provided in the hot water storage tank and at least one of the hot water storage tanks. And a first circulation path that forms a heating cycle, a second circulation path that forms a heat collection cycle with the hot water supply pipe that supplies hot water to the outside and the heat exchanger, and the first circulation path after heating is completed. A hot water supply system including means for switching from a circulation path to the second circulation path and a circulation means for circulating hot water. 3. The hot water supply according to claim 1 or 2, wherein when the hot water is not used outside, the circulating means is forcibly intermittently operated to circulate the hot water in the second circulation path. system. 4. The hot water supply system according to claim 1 or 2, wherein the first circulation path and the second circulation path are switched by a common circulation means for circulation. 5. The first circulation path is a circulation path including a connection pipe returning from an outlet side of a final hot water storage tank connected to a hot water supply pipe for supplying hot water to the outside to a heating means side, and the plurality of hot water storage tanks are connected to each other. The hot water supply system according to claim 1 or 2, wherein heating is performed while circulating hot water.