JPH09243174A - Storage type hot-water feed system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a storage type hot-water feed system which can instantaneously supply hot water without providing a complicated construction. SOLUTION: This storage type hot-water feed system feeds hot water to hot-water delivery plugs 11 provided at several points in a building through a hot-water feed pipe 10 disposed in the building. In this case, a hot-water storage tank 1 having a hot-water outlet port connected to the pipe 10 and a feed water port 1b connected to a feed water pipe 2 and a heater 6 provided in parallel with the tank 1 are provided, and a first circuit for performing a boiling operation by circulating the water of the tank 1 through the heater 6 and a second circuit for performing a heating operation by circulating the hot water of the pipe 10 through the heater 6 are provided, and after completion of the boiling of the tank 1, the upstream side of the pipe 10 is fluidly connected to the heater 6 through a first multidirectional switch valve 8, while the downstream side of the pipe 10 is fluidly connected to a circulation pump 7 through a second multidirectional switch valve 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water supply pipe provided in a building, and hot water taps are installed at various places in the building to supply hot water stored in a hot water storage tank to the hot water tap through the hot water supply pipe. The present invention relates to a hot water storage type hot water supply system.

[0002]

2. Description of the Related Art Generally, as a hot water supply system, a midnight electric power heater is used as a heating device, or hot water is stored in a hot water storage tank by using a heat pump device, and the hot water is piped into the building through a hot water supply pipe. Some of the installed taps supply hot water. In such a system, conventionally, the hot water storage tank is composed of a plurality of hot water storage tanks in order to save space in the hot water storage tank, and the temperature of the hot water is prevented from lowering due to heat radiation in the hot water supply pipe installed in the building, Many proposals have been made to improve the instant hot water property by circulating hot water in the pipe so that hot water can be provided immediately when the hot water tap is opened.

As for the conventional apparatus for improving the quick-melting property, for example, Japanese Patent Application Laid-Open No. 4-45324 (hereinafter referred to as Conventional Example 1) and Japanese Patent Publication No. 3-56372 (hereinafter referred to as Conventional Example 2). Note) etc. In the circulating hot water supply system described in Conventional Example 1, a hot water supply pipe and a return pipe are provided in a hot water storage tank, and a branch pipe connected to a tap is branched from a main pipe of the hot water supply pipe extending from the hot water storage tank. A return branch pipe extending from the return pipe is provided, and the hot water in the hot water supply pipe is returned to the hot water storage tank by the pump from the return branch pipe in the branch pipe through the return pipe.

Further, in the hot water supply system terminal hot water supply device described in Conventional Example 2, a terminal hot water supply device is provided in the vicinity of the faucet, and hot water heated by the hot water supply heat source is reheated to be used as a regulating valve. By mixing with the water supplied from the water supply pipe, immediate hot water conversion is achieved.

[0005]

In Conventional Example 1, hot water is always circulated in the vicinity of the tap, but
Hot water supply pipe, branch pipe, return branch pipe, return pipe are required,
There was a problem that the structure of those piping systems became very complicated.

Further, in the conventional example 2, since the terminal hot water supply device is provided near each faucet independently of the hot water supply heat source device so that hot water can be instantly supplied, the equipment is not provided when hot water is supplied to many places. There is a problem that the cost becomes large and the equipment cost increases.

The present invention has been made in order to solve the above problems, and an object thereof is to obtain a hot water storage type hot water supply system having an improved quick hot water property without a complicated structure.

[0008]

A hot water storage type hot water supply system according to the present invention is a hot water storage type hot water supply system for supplying hot water to hot water taps provided in various places of a building through hot water supply pipes provided in the building, A hot water storage tank having a hot water outlet connected to the hot water supply pipe and a water supply outlet connected to the water supply pipe, and a heater arranged in parallel with the hot water storage tank are provided, and the water in the hot water storage tank is circulated through the heater. A first circuit for performing the boiling operation by performing the heating operation and a second circuit for performing the heating operation by circulating the hot water of the hot water supply pipe through the heater are provided.

The first circuit is formed by connecting the heater and the hot water outlet through the first multi-directional switching valve, and connecting the heater and the water inlet through the second multi-directional switching valve. The second circuit is formed by connecting the heater to the upstream side of the hot water supply pipe via the first multi-directional switching valve and connecting the heater to the downstream side of the hot water supply pipe via the second multi-directional switching valve. It is a thing.

Further, a first temperature detecting means is provided near the water supply port of the first circuit, and a second temperature detecting means is provided downstream of the hot water supply pipe of the second circuit. The start and stop of the heater are controlled by the temperature detected by the first temperature detecting means during the boiling operation and by the temperature detected by the second temperature detecting means during the heating operation in the second circuit. is there.

Further, pressure detecting means is provided on the upstream side of the hot water supply pipe, and when the hot water tap connected to the hot water supply pipe is opened during the heating operation, the heater is operated by the pressure detected by the hot water supply pipe by the pressure detecting means. Is stopped, and the first multidirectional switching valve is switched so that the hot water outlet of the hot water storage tank and the hot water supply pipe communicate with each other.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a hot water storage type hot water supply system according to the present invention will be described below. FIG. 1 is a configuration diagram showing an embodiment of the present invention. In the figure, 1
Is a hot water storage tank having a hot water outlet 1a in the upper part and a water supply port 1b in the lower part, and 2 is a water supply port 1 of the hot water storage tank 1 via a pressure reducing valve 3.
The water supply pipe 4 connected to b is a tap 1a of the hot water storage tank 1.
A hot water outlet pipe 5 connected to the hot water storage tank 1 is a branch pipe branched from a water feed pipe 2 connected to a water feed port 1b of the hot water storage tank 1. 6 is a heater, 7 is a circulation pump, connected by piping,
They are arranged in parallel in the hot water storage tank 1 via a tap pipe 4 and a branch pipe 5. Numeral 8 is a first which is arranged between the tap pipe 4 and the heater 6.
The multidirectional switching valve 9 is a second multidirectional switching valve arranged between the branch pipe 5 and the circulation pump 7. A hot water supply pipe 10 is connected to the first multi-directional switching valve 8 on the upstream side and to the second multi-directional switching valve 9 on the downstream side. 11 is a hot water supply pipe 10
A hot water tap connected to a hot water supply branch pipe 12 connected to the water supply pipe 2 and a water supply branch pipe 13 branched from the water supply pipe 2, 14 is a first temperature detecting means for detecting the temperature of hot water provided in the branch pipe 5, and 15 is a hot water supply Second temperature detecting means for detecting the temperature of the hot water in the hot water supply pipe 10 provided on the downstream side of the pipe 10, and 16 for detecting pressure of the hot water supply pipe 10 provided on the upstream side of the hot water supply pipe 10. .

With the above structure, the flow path of the first multi-directional switching valve 8 is brought into a state in which the hot water discharge pipe 4 and the heater 6 are communicated with each other, and the second
A first circuit is formed between the hot water storage tank 1, the heater 6 and the circulation pump 7 when the branch pipe 5 and the circulation pump 7 are connected to each other through the flow path of the multidirectional switching valve 9. Further, the flow path of the first multi-directional switching valve 8 is set to the state in which the upstream side of the hot water supply pipe 10 and the heater 6 are communicated with each other, and the flow path of the second multi-directional switching valve 9 is set to the downstream side of the hot water supply pipe 10 and the circulation pump. A second circuit is formed between the hot water supply pipe 10 and the heater 6 and the circulation pump 7 when they are brought into communication with each other. Further, when the flow path of the first multi-directional switching valve 8 is set to connect the hot water outlet pipe 4 and the upstream side of the hot water supply pipe 10, a third circuit is formed from the hot water storage tank 1 to the hot water supply pipe 10 through the hot water discharge pipe 4. To be done. Furthermore,
The flow path of the first multi-directional switching valve 8 is set to connect the upstream side of the hot water supply pipe 10 and the heater 6, and the flow path of the second multi-directional switching valve 9 connects the branch pipe 5 and the circulation pump 7. When in the state,
A fourth circuit is formed from the water supply pipe 2 to the hot water supply pipe 10 through the branch pipe 5, the circulation pump 7 and the heater 6.

The first circuit is a boiling circulation system passage for circulating the water in the hot water storage tank 1 and heating it up to a predetermined temperature by the heater 6 for storage, and the second circuit is
When the hot water is not used, the circulating pump 7 is operated to circulate the hot water in the hot water supply pipe 10 to prevent the heater 6 from lowering the hot water temperature in the hot water supply pipe 10. The third circuit is a hot water supply passage for supplying the hot water in the hot water storage tank 1 to the hot water tap 11 through the hot water discharge pipe 4 and the hot water supply pipe 10. The fourth circuit is for the case where there is no hot water in the hot water storage tank 1. An instantaneous hot water supply system path for heating the water supplied from the water supply pipe 2 by the heater 6 and supplying it to the hot water tap 11 through the hot water supply pipe 10.

The above-mentioned respective paths of the hot water storage type hot water supply system according to the present invention will be described below. First,
The boiling circulation path of the present invention will be described. FIG. 2 is a diagram showing a boiling operation operation state of the present invention. Water pipe 2
After completion of water supply from the hot water storage tank 1 to the hot water storage tank 1, the first multi-directional switching valve 8 communicates the hot water storage pipe 1 with the heater 6 and the second multi-directional switching valve 9 connects the branch pipe 5 with the branch pipe 5. It communicates with the circulation pump 7. As a result, a circulation system path is formed between the hot water storage tank 1, the heater 6 and the circulation pump 7. The boiling operation of the hot water storage tank 1 is performed by this circulation system path. First, by driving the circulation pump 7, water stored in the hot water storage tank 1 flows out from the water supply port 1b of the hot water storage tank 1, is sucked by the circulation pump 7 through the branch pipe 5, and passes through the circulation pump 7. Is a heater 6 that is heated by using, for example, late-night power or daytime power, and flows through the hot water outlet pipe 4 from the hot water outlet 1a of the hot water storage tank 1. The boiling circulation system path continues this circulation heating operation until the temperature detected by the first temperature detecting means 14 (for example, the thermistor) provided in the branch pipe 5 reaches a predetermined temperature. By this operation, the water gradually rises from the upper part of the hot water storage tank 1, and when the temperature detected by the first temperature detecting means 14 reaches a predetermined temperature, all the water in the hot water storage tank 1 boils up to the predetermined temperature. Therefore, the heater 6 and the circulation pump 7 are stopped, and the boiling operation of the hot water storage tank 1 is completed.

Next, the heating circulation path of the present invention will be described. FIG. 3 is a diagram showing a heating operation operation state of water in the hot water supply pipe. After the boiling of the hot water storage tank 1 is completed, the first multi-directional switching valve 8 connects the upstream side of the hot water supply pipe 10 with the heater 6, and the second multi-directional switching valve 9 connects the downstream side of the hot water supply pipe 10. It communicates with the circulation pump 7. As a result, the hot water supply pipe 1
A circulation path is formed between 0, the heater 6 and the circulation pump 7. By this circulation system, the hot water in the hot water supply pipe 10 is heated, and when the hot water tap inside the hot water supply pipe 10 is lowered, especially when the hot water tap 11 is opened, cold hot water comes out to the user. It prevents it from causing discomfort. First, if the temperature detected by the second temperature detecting means 15 (for example, a thermistor) provided on the downstream side of the hot water supply pipe 10 is, for example, less than or equal to the lower limit value of a certain set temperature range (width between the upper limit value and the lower limit value), circulation is performed. The hot water in the hot water supply pipe 10 is circulated by driving the pump 7, and is heated by the heater 6. When the temperature detected by the second temperature detecting means 15 reaches the upper limit value by this circulation heating operation, the heater 6 and the circulation pump 7 are stopped. And
When the temperature falls below the lower limit again, the circulation heating operation is performed. By performing the heating operation of the hot water in the hot water supply pipe 10 in this manner, it is possible to improve the quick hot water supply property at the time of hot water supply.

Next, the hot water supply system passage of the present invention will be described. FIG. 4 is a diagram showing a hot water supply operation state. For example, when the hot water tap 11 is opened (hot water is used) during the circulating hot water operation in the hot water supply pipe 10, pressure detection means 16 (for example, a pressure sensor or the like) provided on the upstream side of the hot water supply pipe 10 is used. By detecting the pressure change in the hot water supply pipe 10 when the hot water tap 11 is closed and when the hot water tap 11 is opened, the first multi-directional switching valve 8 is set to the hot water supply pipe 4 of the hot water storage tank 1 and the upstream of the hot water supply pipe 10. Communicate with the side. As a result, the hot water storage tank 1 to the hot water outlet pipe 4
A hot water supply passage is formed through the hot water supply pipe 10. The hot water in the hot water storage tank 1 that has been boiled and stored is pushed up by the tap water pressure (supply water pressure) acting from the water supply pipe 2 through the pressure reducing valve 3 by this system path, and flows out to the hot water discharge pipe 4. Hot water is supplied to the hot water tap 11 through the hot water supply pipe 10. At this time, the discharged hot water is automatically supplied from the water supply port of the hot water storage tank 1 through the water supply pipe 2.

When the hot water tap 11 is closed, the heating circulation operation is resumed, and the hot water supply pipe 1 is operated by the first multidirectional switching valve 8.
The upstream side of 0 and the heater 6 are communicated with each other, and the downstream side of the hot water supply pipe 10 is communicated with the circulation pump 7 by the second multidirectional switching valve 9. By this circulation system, the hot water in the hot water supply pipe 10 is heated, and when the hot water tap inside the hot water supply pipe 10 is lowered, especially when the hot water tap 11 is opened, cold hot water comes out to the user. It prevents you from feeling uncomfortable.

Although the hot water tap 11 is opened during the hot water circulation heating operation in the hot water supply pipe 10, the hot water tap is opened during the boiling operation of the hot water storage tank. The pressure detecting means detects a pressure change in the hot water supply pipe when the hot water tap is closed and when the hot water tap is opened, and connects the first multi-directional switching valve to the hot water discharge pipe of the hot water storage tank and the upstream side of the hot water supply pipe. It is also possible to communicate.

Next, the instant hot water supply system passage of the present invention will be described. FIG. 5 is a diagram showing an instantaneous hot water supply operation state. When the hot water storage tank 1 runs out of hot water, the first multidirectional switching valve 8
The upstream side of the hot water supply pipe 10 and the heater 6 are communicated with each other, and the branch pipe 5 and the circulation pump 7 are communicated with each other by the second multidirectional switching valve 9. As a result, an instantaneous hot water supply system path is formed from the water supply pipe 2 through the branch pipe 5, the circulation pump 7 and the heater 6 to the hot water supply pipe 10. The water supplied from the water supply pipe 2 by this system is heated by the heater 6, and the hot water supply pipe 10
Hot water is supplied to the tap 11 through. According to the present invention, even when the hot water storage tank 1 runs out of water, the water from the water supply pipe 2 is supplied to the first multi-directional switching valve 8 and the second multi-directional switching valve 9.
The hot water can be supplied from the hot water tap 11 by switching to the above and directly heating by the heater 6. Therefore, it is possible to cope with a sudden hot water supply and to improve usability.

When the hot-water tap 11 is closed, the heating / circulation operation is resumed, and the hot water supply pipe 1 is operated by the first multidirectional switching valve 8.
The upstream side of 0 and the heater 6 may be communicated with each other, and the downstream side of the hot water supply pipe 10 and the circulation pump 7 may be communicated with each other by the second multidirectional switching valve 9. Further, the boiling operation of the hot water storage tank 1 may be performed.

In the above embodiment, the hot water storage tank 1 is composed of a single tank, but as shown in FIG.
Even if the above is constituted by a plurality of tanks 1A to 1D, the same effect can be obtained. A circulation circuit is formed by a plurality of hot water storage tanks connected in series and heated by a heater and a circulation pump. When hot water is supplied, hot water in the hot water storage tank is sequentially pushed up by the water supply pressure and supplied to the tap tap. Since the hot water storage tank is composed of a plurality of tanks, there is an effect that space saving of the hot water storage tank can be achieved.

Further, in the above embodiment, the heater and the circulation pump are started and stopped by the temperature detected by the temperature detecting means provided in the hot water supply pipe during the hot water supply pipe heating operation. In other words, the circulation operation may be performed before the morning and evening hours when hot water is used.

Further, in the above-described embodiment, when the hot water tap is opened during the hot water pipe heating operation, the first multi-directional switching valve is connected to the hot water tank and the hot water pipe by the pressure detected by the pressure detecting means provided in the hot water pipe. Although the switching is made so as to communicate with each other, the hot water supply branch pipe to which the hot water supply pipe and the hot water tap are connected may be provided with detection means such as a flow switch and a flow rate sensor, and the detection signal may be used for switching.

[0025]

As described above, according to the present invention, in the hot water supply system for supplying hot water to the taps provided in various parts of the building through the hot water pipes arranged in the building, A hot water storage tank having a hot water outlet connected to the hot water supply pipe and a heater connected to the hot water supply pipe, and a heater arranged in parallel with the hot water storage tank are provided, and water in the hot water storage tank is circulated through the heater to boil water. Since the first circuit for performing the raising operation and the second circuit for performing the heating operation by circulating the hot and cold water of the hot water supply pipe through the heater are provided, it is possible to improve the quick hot water supply property at the time of hot water supply, and Since the heater is commonly used during the boiling operation of the first circuit and during the heating operation of the second circuit, there is an effect that the facility cost can be reduced.

In the first circuit, the first temperature detecting means is provided near the water supply port of the first circuit, and the second temperature detecting means is provided downstream of the hot water supply pipe in the second circuit. Since the start and stop of the heater are controlled by the temperature detected by the first temperature detecting means during the boiling operation and by the temperature detected by the second temperature detecting means during the heating operation in the second circuit, respectively.
The effect is obtained that the heater can be operated efficiently and energy can be reduced.

Further, a pressure detecting means is provided on the upstream side of the hot water supply pipe, and when the hot water tap connected to the hot water supply pipe is opened during the heating operation, the pressure of the hot water supply pipe is detected by the pressure detecting means to operate the heater. Since the first multi-directional switching valve is switched so that the hot water outlet port of the hot water storage tank and the hot water supply pipe communicate with each other, the hot water supply request can be met even during the heating operation of the hot water supply pipe. The effect that it can be supplied to the stopper is obtained.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present invention.

FIG. 2 is a diagram showing a boiling operation in FIG.

FIG. 3 is a diagram showing a hot water supply pipe heating operation operation in FIG. 1.

FIG. 4 is a diagram showing a hot water supply operation in FIG. 1.

5 is a diagram showing an instantaneous hot water supply operation in FIG.

FIG. 6 is a configuration diagram showing another embodiment of the present invention.

[Explanation of symbols]

1 hot water storage tank, 2 water supply pipe, 6 heater, 7 circulation pump, 8 1st multi-directional switching valve, 9 2nd multi-directional switching valve,
10 hot water supply pipe, 11 hot water tap, 14 first temperature detecting means, 15 second temperature detecting means, 16 pressure detecting means

Claims (4)

[Claims] 1. A hot water storage type hot water supply system for supplying hot water to hot water taps provided at various places of the building via hot water hot water supply pipes provided in a building, wherein a hot water supply port and a hot water supply pipe connected to the hot water supply pipes are provided. A hot water storage tank having a water supply port continuously connected to the hot water storage tank; and a heater provided in parallel with the hot water storage tank, wherein water in the hot water storage tank is circulated through the heater to perform a boiling operation. And a second circuit for circulating the hot and cold water of the hot water supply pipe through the heater to perform a heating operation. 2. The first circuit connects the heater and the hot water outlet through a first multi-directional switching valve, and connects the heater and the water supply port through a second multi-directional switching valve. And the second circuit connects the heater and the upstream side of the hot water supply pipe via the first multi-directional switching valve, and connects the heater to the heater via the second multi-directional switching valve. The hot water storage type hot water supply system according to claim 1, wherein the hot water supply pipe is formed by connecting downstream sides thereof. 3. A first temperature detecting means is provided near the water supply port of the first circuit, and a second temperature detecting means is provided downstream of the hot water supply pipe of the second circuit. During the boiling operation in the circuit, the operation of the heater is started by the temperature detected by the first temperature detecting means, and during the heating operation in the second circuit, by the temperature detected by the second temperature detecting means. The storage hot water supply system according to claim 1 or 2, wherein the stop is controlled. 4. A pressure detecting means is provided on the upstream side of the hot water supply pipe, and when a hot water tap connected to the hot water supply pipe is opened during heating operation, the pressure is detected by the hot water supply pipe by the pressure detecting means. The operation of the water heater is stopped, and the first multi-way switching valve is switched so that the hot water outlet of the hot water storage tank and the hot water supply pipe communicate with each other.
Hot water storage system as described.