JP2003336899A - Hot water supply/instantaneous water heating system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hot water supply/instantaneous water heating system providing an instantaneous water heating function with few pipes. <P>SOLUTION: This hot water supply/instantaneous water heating system is provided with a water incoming pipe 3 for connecting a water supply to a water inlet 2a of a water heater 2, a check valve 4 provided in the water incoming pipe 3, a hot water supply pipe 5 connecting a hot water outlet 2b of the water heater 2 to a hot water supply plug 1, and a return pipe branching the connecting part between the hot water supply pipe 5 and the hot water supply plug 1 and connected to the downstream side of the check valve 4 of the water incoming pipe 3, forms a circulating route thereof, and interposes a circulation pump 7 in the circulating route. This system is also provided with a bypass pipe 8 connecting the hot water feed pipe 5 to the return pipe 6, and two-way valves 9a-9c opening/closing the hot water feed pipe 6a and the return pipe 5a in the upstream side of the bypass pipe 8 and the bypass pipe 8 respectively, and performs water supply, the hot water supply, and instantaneous water heating by changing over the operation of the circulation pump 7 and the two- way valves 9a-9c. <P>COPYRIGHT: (C)2004,JPO

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 and hot water system, and more particularly, to a hot water supply system which enables hot water to be discharged from a hot water supply tap such as a calan or a shower, so that the hot water supply tap can be quickly removed from the hot water supply tap without waiting. It is related to the technology to let hot water out of the room.

[0002]

2. Description of the Related Art In a conventional hot water supply system, when hot water is discharged from a hot water tap such as a curran or a shower, hot water discharged from a water heater and cold water supplied from a water source are supplied to the hot water tap, and these hot water taps are supplied. Then, it is mixed with the desired temperature and tapped. That is, a mixing faucet for mixing hot and cold water (a hot and cold water mixing faucet) is used as the hot water tap, and the hot water supply pipe from the water heater and the water supply pipe from the water source are connected to the mixing faucet.

By the way, in the hot water supply system configured as described above, there has been proposed a hot water supply system provided with an immediate hot water system as shown in FIG. 5 in order to ensure prompt hot water discharge from the hot water tap.

That is, in the normal hot water supply system, as described above, the hot water supply pipe c from the hot water supply device b and the water supply pipe d from the water source are connected to the mixing faucet a. , A hot water supply return pipe e for returning hot water to the hot water supply device b from before the mixing faucet a in the hot water supply pipe c
And a circulation pump f is arranged in the hot water return pipe e.

When hot water is not discharged from the mixing faucet a, the circulation pump f is driven to drive the water heater b.
The hot water discharged from the hot water supply pipe c is circulated again to the hot water supply device b via the hot water supply return pipe e to be heated by the hot water supply device b to prevent the temperature of the hot water in the hot water supply pipe c from decreasing. In the figure, reference numeral g indicates a check valve.

[0006]

However, such a conventional configuration has the following problems and its improvement has been desired.

That is, the above-mentioned hot water system requires construction of the hot water supply pipe and the hot water supply return pipe in addition to the hot water supply pipe. In other words, it is necessary to install three pipes in total for one hot-water tap. Therefore, the construction work of the piping is complicated and the unit price of the product is expensive.

In addition, since the conventional hot water system requires the construction of the hot water supply return pipe as described above, it is not suitable for construction in a building having a small piping space such as an apartment house. When the hot water supply system is retrofitted to the hot water supply system, it is difficult to secure a piping space.

The present invention has been made in view of the above conventional problems, and an object thereof is to reduce the number of pipes so that an existing hot water supply / water supply pipe can be used to realize an immediate hot water system. It is to provide a hot water supply and hot water system that can realize an instant hot water function.

[0010]

In order to achieve the above object, a hot water supply and hot water system of the present invention comprises a water inlet pipe connecting a water source and a water inlet of a water heater, and a check valve provided in the water inlet pipe. , Hot water supply pipe connecting the hot water outlet and hot water tap,
A circulating pipe is formed by branching the connection between the hot water supply pipe and the hot water supply tap and connecting with a return pipe connected to the check valve downstream side of the water supply pipe, and a circulation pump is interposed in the circulation system path. A hot water supply and hot water system that is configured to circulate hot water and reheat the circulating water with the hot water supply device, wherein a bypass path that connects the hot water supply pipe and the return pipe is provided and the bypass is provided. It is characterized in that opening / closing means for opening / closing the hot water supply pipe and the return pipe on the upstream side of the route and the bypass route are provided.

During the hot water supply operation, the circulation pump is stopped and only the opening / closing means for opening / closing the return pipe is closed.

Further, during the water supply operation, the circulation pump is stopped and only the opening / closing means for opening / closing the hot water supply pipe is closed.

Further, during the immediate hot water operation, the circulation pump is driven and only the opening / closing means for opening / closing the bypass path is closed.

In a preferred embodiment of the hot water supply and hot water system of the present invention, the hot water supply pipe and the return pipe provided on the downstream side of the bypass route are provided on the upstream side of the bypass route. It is characterized by using a pipe having a smaller pipe diameter than the return pipe.

Here, the upstream side means the above water source side, and the downstream side means the hot water tap side (hereinafter the same).

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below in detail with reference to the drawings.

Embodiment 1 FIG. 1 is an explanatory diagram showing a schematic configuration of a hot water supply and hot water system to which the present invention is applied. This hot water supply / hot water supply system is a hot water supply system having an immediate hot water function that allows hot water to be discharged from a hot water tap without a so-called hot water waiting time, and connects a water source (not shown) to a water inlet 2a of the water heater 2. Water inlet pipe 3, check valve 4 provided in water inlet pipe 3, hot water outlet 2b of hot water supply device 2 and hot water tap (in the present embodiment, single water to be discharged without mixing hot water supplied from the pipe) Hot water supply pipe 5 that connects 1)
And a return pipe 6 which branches the connection between the hot water supply pipe 5 and the hot water tap 1 and is connected to the downstream side of the check valve 4 of the water supply pipe 3 to form a circulation path.

A circulation pump 7 for circulating hot and cold water in the circulation system passage is provided in the circulation system passage. By driving the circulation pump 7, hot water and hot water are forced in the circulation system passage. Circulation is possible.

Between the hot water supply pipe 5 and the return pipe 6, a bypass pipe (bypass path) 8 for connecting the hot water supply pipe 5 and the return pipe 6 is provided.
A hot water supply pipe 5a on the upstream side of the bypass pipe 8, a return pipe 6a on the upstream side of the bypass pipe 8, and an opening / closing means 9 for opening and closing each pipe are provided in the bypass pipe 8.

Specifically, in this embodiment, as the opening / closing means 9, two-way valves 9a-9c are adopted as shown in the figure. That is, the hot water supply pipe 5a on the upstream side of the bypass pipe 8 is formed by the two-way valve 9a, the return pipe 6a on the upstream side of the bypass pipe 8 is formed by the two-way valve 9b, and the bypass pipe 8 is formed by the two-way valve 9c. , And can be opened / closed (open / closed).

In the present embodiment, the hot water supply pipe 5 is used.
Both the return pipe 6 and the return pipe 6 are constructed with pipes having different pipe diameters on the upstream side and the downstream side of the connection portion with the bypass pipe 8 as a boundary. That is, the hot water supply pipe 5b and the return pipe 6 provided on the downstream side of the bypass pipe 8
For b, a pipe having a smaller pipe diameter than that of the hot water supply pipe 5a or the return pipe 6b provided on the upstream side of the bypass pipe 8 is used, and preferably a resin pair tube is used.

Next, the operation of the hot water supply and hot water system thus constructed will be described in the order of each operation of water supply, hot water supply and immediate hot water (heat retention) based on FIG.

During water supply operation: Hot water from the hot water tap 1 (hot water heater 2
2), the operation of the circulation pump 7 is stopped and only the two-way valve 9a for opening and closing the hot water supply pipe 5 is closed, as shown in FIG. 2 (a).
The other two-way valves 9b and 9c are opened. Further, during the water supply operation, the water heater 2 is in the operation stop state.

As a result, when the hot water supply tap 1 is opened in this state, the cold water supplied from the water source to the water supply pipe 3 does not flow into the hot water supply device 2 which is not in operation, so that it flows into the return pipe 6a on the upstream side. It is guided and passes through the circulation pump 7 and the two-way valve 9b to reach the joint with the bypass pipe 8, where it is branched into the bypass pipe 8 and the return pipe 6b on the downstream side.

At this time, since the two-way valve 9a provided in the upstream hot water supply pipe 5a is closed, the cold water flowing into the bypass pipe 8 is guided to the downstream hot water supply pipe 5b through the two-way valve 9c. It reaches the hot water tap 1. On the other hand, the cold water guided to the downstream return pipe 6b is directly guided to the hot water tap 1.
That is, the cold water branched into the bypass pipe 8 and the return pipe 6b on the downstream side joins again in the hot water tap 1 and is discharged from the hot water tap 1.

During hot water supply operation: When performing hot water supply operation, FIG.
As shown in (b), the operation of the circulation pump 7 is stopped and only the two-way valve 9b that opens and closes the return pipe 6 is closed, and the other two-way valves 9a and 9c are opened. Further, at this time, the water heater 2 executes a combustion operation in which hot water can be discharged at a predetermined hot water supply set temperature.

As a result, when the hot water supply tap 1 is opened in this state, the hot water supplied from the water inlet pipe 3 and heated by the combustion operation of the water heater 2 is guided to the upstream hot water supply pipe 5a and opened. It passes through the two-way valve 9a in the state and reaches the joint with the bypass pipe 8, where it is branched into the bypass pipe 8 and the hot water supply pipe 5b on the downstream side.

At this time, since the two-way valve 9b provided on the upstream return pipe 6a is closed, the hot water flowing into the bypass pipe 8 is guided to the downstream return pipe 6b via the two-way valve 9c. It reaches the hot water tap 1. On the other hand, the hot water guided to the hot water supply pipe 5b on the downstream side is directly guided to the hot water supply tap 1.
That is, also in this hot water supply operation, the hot water branched into the bypass pipe 8 and the hot water supply pipe 6b on the downstream side at the bypass pipe 8 joins again at the hot water supply tap 1 and is discharged from the hot water supply tap 1.

Immediate hot water operation: When performing immediate hot water operation, as shown in FIG.
As shown in (c), the circulation pump 7 is driven, only the two-way valve 9c that opens and closes the bypass pipe 8 is closed, and the other two-way valves 9a and 9b are opened. Further, at this time, the water heater 2 executes a predetermined combustion operation (heat retention operation) for keeping the hot water in the pipe warm.

When performing the hot water operation, the hot water tap 1 is in the closed state. Therefore, when the circulation pump 7 is driven in this state, the hot water discharged from the circulation system path, that is, the water heater 2 is fed from the hot water supply pipe 5. It is guided to the return pipe 6, circulates again from the water inlet pipe 3 through the circulation pump 7 to the water heater 2, and is heated and heated by the water heater 2. At this time, since the check valve 4 is provided in the water inlet pipe 3, the hot water guided to the water inlet pipe 3 circulates in the circulation system passage without flowing back to the water source side.

Therefore, when the hot water tap 1 is opened during this hot water operation, the hot water circulating in the circulation path is tapped from the hot water tap 1 so that hot water can be tapped without waiting for hot water. .

As described above, according to the hot water supply and hot water supply system of the present invention, the operation states of the circulation pump 7 and the opening / closing means 9 are switched during the respective operations of water supply, hot water supply and immediate hot water, so that the above hot water supply is performed. It is possible to provide a hot water supply system capable of performing operations of water supply, hot water supply, and immediate hot water by simply connecting two pipes of the hot water supply pipe 5 and the return pipe 6 to the tap 1. In other words, unlike the conventional hot water supply system, the immediate hot water function can be realized without providing a dedicated pipe (hot water return pipe) for the immediate hot water function, which is suitable for construction in a place with a small piping space, and It is possible to provide a hot water supply system with a low product unit price. Further, since the hot water supply return pipe is not required, it is easy to retrofit the existing hot water supply system with an immediate hot water function.

According to the hot water supply and hot water supply system of the present invention, both the downstream hot water supply pipe 5b and the downstream return pipe 6b function as water supply or hot water supply pipes during water supply and hot water supply operation, respectively. It becomes easier to secure the amount of hot water (or the amount of water) as compared with the conventional hot water supply system in which hot water supply and water supply are performed by one pipe.

Further, since the amount of hot water (or the amount of water) is easily secured in this way, for example, when replacing the conventional hot water supply system with the hot water supply and hot water supply system of the present invention, the hot water supply pipe 5b on the downstream side is provided. And the return pipe 6b on the downstream side
The pipe diameter can be reduced, and the construction cost can be suppressed in this respect as well. Moreover, since the temperature of the hot water can be prevented from lowering due to heat dissipation by reducing the pipe diameter, it is possible to suppress the fuel consumption during the warming operation as compared with the conventional hot water supply system, and to provide a hot water supply system with a low running cost.

Second Embodiment Next, a second embodiment of the present invention will be described with reference to FIGS.
It will be described based on. The second embodiment shows a modified example of the opening / closing means 9, and specifically shows a case where three-way valves 9d, 9e are provided at both ends of the bypass pipe 8 as the opening / closing means 9. Since the configuration other than the opening / closing means 9 is the same as that of the first embodiment, the common parts are denoted by the same reference numerals and the description thereof will be omitted.

In this embodiment, during the water supply operation, as shown in FIG.
As shown in FIG. 5, the operation of the circulation pump 7 is stopped, and the three-way valve 9d provided in the hot water supply pipe 5 is closed only in the water heater 2 side valve (shown in black in the figure) and the other valves (three-way valve) are closed. The bypass pipe 8 side of the valve 9d and the hot water tap 1 side, and all valves of the three-way valve 9e provided in the return pipe 6 are opened. In addition, at this time, the water heater 2 is in the operation stop state.

As a result, when the hot water supply tap 1 is opened in this state, the cold water supplied from the water source to the water supply pipe 3 does not flow into the hot water supply device 2 which is not in operation, but the return pipe 6a on the upstream side.
Led to the three-way valve 9e through the circulation pump 7,
Here, the bypass pipe 8 and the return pipe 6b on the downstream side are branched.

At this time, the three-way valve 9 provided in the hot water supply pipe 5
As for d, the valve on the side of the water heater 2 is in the closed state as described above, so that the cold water flowing into the bypass pipe 8 can be cooled by this 3-way valve 9d.
Through the hot water supply pipe 5b on the downstream side to reach the hot water supply tap 1. On the other hand, the cold water guided to the return pipe 6b on the downstream side is directly guided to the hot water tap 1, so that the cold water branched by the three-way valve 9e joins again at the hot water tap 1 and exits from the hot water tap 1.

During the hot water supply operation, as shown in FIG. 4 (b), the operation of the circulation pump 7 is stopped and the upstream return pipe 6a of the three-way valve 9e provided in the return pipe 6 is connected.
Only the valve (shown in black in the figure) connected to is closed, and the other valves (the bypass pipe 8 side of the three-way valve 9e and the hot water tap 1 side, and all of the three-way valve 9d provided in the hot water supply pipe 5) are closed. Open the valve). At this time, the water heater 2 executes a combustion operation in which hot water can be discharged at a predetermined hot water supply set temperature.

As a result, when the hot water supply tap 1 is opened in this state, the hot water supplied from the water inlet pipe 3 and heated by the combustion operation of the water heater 2 is guided to the upstream hot water supply pipe 5a and three-wayed. It reaches the valve 9d, where it is branched into the bypass pipe 8 and the hot water supply pipe 5b on the downstream side.

At this time, the three-way valve 9 provided in the return pipe 6
As for e, since the valve on the upstream return pipe 6a side is in the closed state as described above, the hot water flowing into the bypass pipe 8 is guided to the downstream return pipe 6b via the three-way valve 9e and is supplied to the hot water tap 1. Reach On the other hand, since the hot water guided to the hot water supply pipe 5b on the downstream side is directly guided to the hot water supply tap 1, the hot water branched by the three-way valve 3d joins again at the hot water supply tap 1 and is discharged from the hot water supply tap 1.

When performing the hot water operation, as shown in FIG. 4 (c), the circulation pump 7 is driven and the three-way valves 9d and 9e for opening and closing the bypass pipe 8 are connected to the bypass pipe 8 side. Only the valve (shown in black in the figure) is closed and all the other valves are opened (that is, the branch from the hot water supply pipe 5 and the return pipe 6 to the bypass pipe 8 is closed). At this time, the water heater 2 executes a predetermined combustion operation (heat retention operation) for keeping the hot water in the pipe warm.

During the hot water operation, the hot water tap 1 is in the closed state. Therefore, the circulation pump 7 is driven in this state, so that the hot water discharged from the circulation system path, that is, the water heater 2 is discharged from the hot water supply pipe 5. The circulation pump 7 is guided to the return pipe 6.
Through the water inlet pipe 3 to the water heater 2 again.
It is kept warm at. At that time, since the check valve 4 is provided in the water inlet pipe 3, the hot water guided to the water inlet pipe 3 does not flow back to the water source side, and the warm water is circulated in the circulation system passage to keep the temperature. .

As described above, also in the hot water supply and hot water supply system according to the present embodiment, the operation states of the circulation pump 7 and the opening / closing means 9 are switched during the respective operations of the water supply, the hot water supply and the immediate hot water, so that the above respective operations are performed. As in the case of the first embodiment described above, each operation of water supply, hot water supply, and immediate hot water can be performed only by connecting the two pipes of the hot water supply pipe 5 and the return pipe 6 to the hot water tap 1. The same effect as the case of the form 1 can be obtained.

It should be noted that the above-described embodiments are merely preferred embodiments of the present invention, and the present invention is not limited to these, and various design changes can be made within the scope.

For example, in the above-mentioned embodiment, the case where the circulation pump 7 is provided in the return pipe 6a on the upstream side has been shown, but the circulation pump 7 may be provided in the circulation system passage, for example, It may be provided in the return pipe 6b or the hot water supply pipe 5 on the downstream side.

In the above-described embodiment, the case where one pipe is used as the bypass pipe 8 is shown. However, for example, two bypass pipes 8 are provided in parallel, and one bypass pipe is connected to the hot water supply pipe 5. It is also possible to provide the three-way valve only in a part and to provide the three-way valve in the other bypass pipe only in the connection part with the return pipe, and to perform the same operation as in the above-described second embodiment.

Further, in the above-described embodiment, the case where the hot water in the pipe is heated by the water heater 2 during the hot water operation is shown, but the water heater 2 is used for heating the hot water in the pipe. It is also possible to use other heating means. For example, a unit having an electric heater or the like for heating the hot water in the pipe may be provided on the circulation path as a heating means to keep the hot water in the pipe warm.

[0049]

As described in detail above, in the hot water supply and hot water system of the present invention, the water inlet pipe connecting the water source and the water inlet of the water heater, the check valve provided in the water inlet pipe, and the water heater A circulation path is formed by having a hot water supply pipe that connects the hot water outlet and the hot water supply tap, and a return pipe that branches the connection part of the hot water supply pipe and the hot water tap and is connected to the check valve downstream side of the water supply pipe. A hot water supply and hot water system in which hot water is circulated through a circulation pump in the circulation system and the circulating water can be reheated by the water heater, wherein the hot water supply pipe and the return pipe are provided. Since a hot water supply pipe and a return pipe on the upstream side of the bypass route and an opening / closing means for opening and closing the bypass route are respectively provided, a hot water supply tap has two hot water supply pipes and return pipes. With only the piping of
By switching the operating states of the circulation pump and the opening / closing means, it is possible to perform water supply, hot water supply, and immediate hot water operations. Therefore, in order to realize the instant hot water function, there is no need for a dedicated pipe (hot water return pipe) unlike the conventional hot water supply system, so a hot water supply system suitable for construction in a place with a small piping space and a low product unit price Can be provided.

[Brief description of drawings]

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

FIG. 2 is an explanatory diagram showing the operation of the hot water supply and hot water supply system, FIG. 2 (a) shows an operation status during a water supply operation, FIG. 2 (b) shows an operation status during a hot water supply operation, and FIG. ) Indicates the operation status during hot water operation.

FIG. 3 is an explanatory diagram showing a schematic configuration of another embodiment of the hot water supply and hot water system.

FIG. 4 is an explanatory diagram showing an operation of the hot water supply and hot water supply system according to the other embodiment, FIG. 4 (a) shows an operation status during a water supply operation, and FIG. 4 (b) shows an operation status during a hot water supply operation. 4 (c) shows the operating conditions during the immediate hot water operation.

FIG. 5 is an explanatory diagram showing a schematic configuration of a conventional hot water supply system having an immediate hot water function.

[Explanation of symbols]

1 Hot water tap 2 water heater 3 water inlet piping 4 Check valve 5 Hot water supply piping 6 Return piping 7 Circulation pump 8 Bypass piping (bypass route) 9 opening and closing means 9a-9c two-way valve 9d, 9e 3-way valve

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Akira Tanaka             93 Edo-cho, Chuo-ku, Kobe-shi, Hyogo Stock Association             Company Noritsu F-term (reference) 3L034 DA05

Claims (5)

[Claims] 1. A water inlet pipe connecting a water source and a water inlet of a water heater, a check valve provided in the water inlet pipe, a hot water pipe connecting a hot water outlet of the water heater and a hot water tap, and the hot water pipe. A circulation path is formed by branching the connection part of the hot water tap and a return pipe connected to the check valve downstream side of the water inlet pipe, and a circulation pump is interposed in this circulation system passage to supply hot water. A hot water supply and hot water system in which the circulating water is circulated and the circulating water can be reheated by the water heater. A hot water supply pipe is provided with a bypass passage communicating with the return pipe, and an upstream side of the bypass passage is provided. A hot water supply and hot water supply system, which is provided with opening and closing means for opening and closing the hot water supply pipe, the return pipe, and the bypass path, respectively. 2. The hot water supply and hot water supply system according to claim 1, wherein during the hot water supply operation, the circulation pump is stopped and only the opening / closing means for opening / closing the return pipe is closed. 3. The hot water supply and hot water system according to claim 1, wherein during the water supply operation, the circulation pump is stopped and only the opening / closing means for opening and closing the hot water supply pipe is closed. 4. The hot water supply and hot water system according to claim 1, wherein during the hot water operation, the circulation pump is driven and only the opening / closing means for opening / closing the bypass path is closed. 5. The hot water supply pipe and the return pipe provided on the downstream side of the bypass route have a diameter smaller than that of the hot water supply pipe or the return pipe provided on the upstream side of the bypass route. Claims 1 to 4 characterized
Hot water supply and hot water system described in any one of.