JP3199508B2 - Hot water heater in hot water supply system - Google Patents

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 device in a hot water supply system.

[0002]

2. Description of the Related Art Conventionally, as a hot water supply system for supplying hot water from a water heater to a bathroom, a lavatory or other kitchens, a system in which the water heater to the hot water faucet is communicated by a single conduit has been generally used.

[0003]

In the above conventional hot water supply system, if the hot water faucet is closed after using the hot water and the hot water is not used for a long time, the hot water in the water heater and the conduit of the hot water faucet stays for a long time. Then, the temperature of the hot water in the conduit falls and becomes cold water.

[0004] Therefore, when a hot water tap is opened to use hot water after a long time has passed, the use of hot water until the cold water in the conduit starts to flow out of the hot water faucet and the amount of cold water remaining in the conduit ends. There is a problem that can not be. In particular, when the conduit distance from the water heater to the hot water faucet is long, water must be continuously supplied for a long time, which is inconvenient when water is to be used immediately and wastes water.

In order to solve such a problem,
As shown in FIG. 3, a hot water supply system in which the space between the hot water supply device 1 and the hot water faucet 2 is annularly communicated with a hot water supply conduit 3 and a return hot water conduit 4 to constantly circulate hot water is also conceivable. In the figure, reference numeral 5 denotes a flow meter.

However, in this hot water supply system, since the hot water is constantly heated to circulate the hot water, a large amount of heat energy for heating is lost, and there is a problem in energy saving measures. Therefore, an object of the present invention is to propose a hot water device that can immediately use hot water when the hot water faucet is opened and operated, can be used immediately, and is energy saving effective.

[0007]

SUMMARY OF THE INVENTION The present invention is to solve the above-mentioned problems, and the first invention is to provide a water heater (6) with:
A hot water supply pipe (7) and a return pipe (8) are piped, and a downstream end of the hot water supply pipe (7) and an upstream end of the return pipe (8) are located near the hot water faucet (9) and communicate with each other. A flow meter (10) is installed in 7), an opening / closing solenoid valve (11) for opening and closing the pipe (8) and a temperature for detecting the hot water temperature in the pipe (8) are provided in the return pipe (8). And an on-off solenoid valve (1) based on a flow signal from the flow meter (10) and a temperature signal from the temperature sensor (13).
A controller (12) for opening and closing control 1),該Ko
The opening and closing solenoid valve (11) is opened at the controller (12).
In hot water circulation with hot water faucet (9) closed
The instantaneous flow rate of the flow meter (10) is stored and the open / close solenoid valve
(11) is open and hot water tap (9) is opened to flow
The instantaneous flow rate of the meter (10) is the instantaneous flow rate stored above.
When the number exceeds the limit, the opening / closing solenoid valve (11) is closed.
A first valve control function for transmitting a signal
The temperature of the hot water becomes lower than the predetermined temperature, and this is
Open signal is sent to the open / close solenoid valve (11) when (13) detects
And sends it to the
When the sensor (13) senses, closes the open / close solenoid valve (11)
A second valve control function for transmitting a signal
The first valve control unit prior to the valve opening command according to (13).
The opening / closing solenoid valve (11) is closed by the function.

[0008] In a second aspect of the present invention, a water heater (6) is provided.
Hot water pipe (7) and return pipe (8)
Connect the downstream end of (7) and the upstream end of return conduit (8) with hot water tap
It is located near (9) and communicates with the hot water supply conduit (7).
A quantity meter (10) is installed, and the return conduit (8) is
An on-off solenoid valve (11) for opening and closing (8);
A temperature sensor (13) for sensing the temperature of hot water in the pipe;
The flow signal from the flow meter (10) and the temperature sensor
The solenoid valve (1) based on the temperature signal from the
A controller (12) for controlling the opening and closing of 1) is provided, and the two pipes (7) and (8) have a double pipe structure in which the hot water supply pipe (7) is located inside.

[0009]

When the hot water faucet (9) is closed and the hot water has not been used for a long time, and the temperature of the hot water in the return conduit (8) becomes low below a predetermined temperature, the temperature sensor (13) detects the low hot water temperature. And the controller (12) detects the opening / closing solenoid valve (11)
To open. Therefore, the hot water heated by the water heater (6) circulates through both pipes (7) and (8), and both pipes (7),
(8) The temperature of the hot water inside rises.

When the temperature becomes higher than a predetermined level, a temperature sensor (13) senses the high temperature, and a controller (12)
This closes the opening / closing solenoid valve (11) to stop circulation of hot water. By this stop, the heating action of the water heater (6) stops.

Due to the heating and stopping, the insides of both tubes 7 and 8 are always maintained at a predetermined temperature, and the heating of the hot water more than necessary is prevented, so that the loss of heat energy is reduced. Further, as described above, the hot water temperature in both pipes (7) and (8) is always maintained at a predetermined temperature, and the downstream open end of hot water supply conduit (7) is located near hot water faucet (9). Therefore, even when the hot water faucet (9) is opened after a long non-use, hot water heated to a predetermined temperature immediately flows out.

Further, when the open hot water faucet (9) long using a large amount of hot water, hot water temperature in the return conduit (8) is a low temperature given below. In this case, hot water faucet (9)
Since the instantaneous flow rate of the hot water when the hot water faucet (9) is opened and the hot water is used is larger than the instantaneous flow rate when the hot water circulates in the closed state, the flow rate is measured by using a flow meter. (1
0), the controller (12) closes the on-off solenoid valve (11) in preference to the valve opening command from the temperature sensor (13).

When both pipes (7) and (8) have a double pipe structure, the heat radiation of the hot water in the hot water supply conduit (7) is suppressed.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention shown in FIG. 1 will be described. A hot water supply 6 is a hot water supply, and has a hot water supply conduit 7 and a return conduit 8 connected thereto.

The outlet side of the hot water supply pipe 7 is connected to the vicinity of the hot water faucet 9 and its outlet side end 7a is open. 10
Is a flow meter installed in the hot water supply conduit 7.

Reference numeral 11 denotes an open / close solenoid valve installed in the return conduit 8,
Reference numeral 12 denotes a controller that controls opening and closing of the opening and closing electromagnetic valve 11. The upstream portion of the return conduit 8 is connected to the flow meter 10
The hot water flowing out of the outlet side end 7a of the hot water supply conduit 7 is piped so as to wrap the outer periphery of the hot water supply conduit 7 with an appropriate gap in the downstream portion of the It has a double pipe structure that returns to the water heater 6 through the flow path 8a.

The pipe 9 a of the hot water tap 9 is connected to the upstream end of the return conduit 8. Reference numeral 13 denotes a temperature sensor, which is located upstream of the on-off electromagnetic valve 11 in the return conduit 8 and is installed so as to sense the temperature of the hot water in the return conduit 8.

[0018] The controller 12, the closing solenoid valve 11 is in the open state and warm water faucet 9 stores the instantaneous flow rate of the flow meter 10 during the hot water circulation closed, and closing the solenoid valve 11 is in the open state warm water faucet 9 is opened the flow meter 1
When the instantaneous flow rate of 0 is larger than the stored instantaneous flow rate, a first actuation signal is transmitted to the on-off solenoid valve 11.
Valve control function is incorporated.

The controller 12 further includes a return conduit 8
When the temperature of the hot water in the inside becomes lower than a predetermined temperature, for example, 40 ° C., and the temperature is detected by the temperature sensor 13, an open signal is transmitted to the opening / closing solenoid valve 11, and the temperature becomes higher than the predetermined temperature. A second valve control function for transmitting a close signal to the opening / closing electromagnetic valve 11 when the sensor 13 senses is incorporated.

In the figure, reference numeral 14 denotes a heat insulating material covering the outer surface of the tube, and 1
Reference numeral 5 denotes a pipe for supplying tap water to the water heater 6. Next, the operation of the present embodiment will be described.

Now, assuming that the hot water boiled in the water heater 6 is filled in the hot water supply conduit 7 and the opening / closing solenoid valve 11 is in the open state, when the hot water faucet 9 is opened, the outflow end 7a of the hot water supply conduit 7 is turned off. Since the hot water is located near the hot water faucet 9, the hot water heated to a predetermined temperature immediately flows out of the hot water faucet 9.

When the hot water faucet 9 is closed after the hot water is used, the hot water flowing out of the outlet side end 7a of the hot water supply conduit 7 flows through the return conduit 8, passes through the temperature sensor 13 and the open / close solenoid valve 11 and passes therethrough. Return to the water heater 6. Then, while the open / close solenoid valve 11 is in the open state, the hot water in the return conduit 8 is reheated by the water heater 6 and flows out to the hot water conduit 7, and the hot water circulates through both pipes 7, 8.

By this circulation, the hot water in the return conduit 8 is heated to a predetermined temperature (for example, 40 ° C.) or more, and when the temperature of the hot water is detected by the temperature sensor 13, the controller 12 sends a closing signal to the on-off solenoid valve 11. The transmission is performed, and the on-off electromagnetic valve 11 is closed to stop the circulation of hot water.

By stopping the flow of the hot water, the heating operation of the heating source in the water heater 6 is stopped. After the stop of the heating operation, the heat in the return conduit 8 is reduced to a low temperature equal to or lower than a predetermined temperature by the heat radiation from the return conduit 8, and the low temperature is detected by the temperature sensor
3, the opening signal is transmitted from the controller 12 to the opening / closing solenoid valve 11, the opening / closing valve 11 is opened, and the hot water circulates in the same manner as described above. Thereby, the heating action of the heating source in the water heater 6 is also started, and the circulating hot water is heated to a predetermined temperature.

Therefore, while the hot water faucet 9 is in the closed state, the temperature of the hot water in both conduits 7, 8 is always maintained at a predetermined temperature. Therefore, when hot water faucet 9 is opened at a desired time when hot water is to be used, hot water of a predetermined temperature immediately flows out of hot water faucet 9, and hot water can be used immediately.

Next, when the hot water faucet 9 is opened and the hot water is used for a long time, the temperature of the hot water in the return conduit 8 may be lower than a predetermined temperature. In this case, the temperature sensor 13 is connected to the return conduit 8
If there is no countermeasure for sensing the low temperature of the hot water inside, the opening / closing solenoid valve 11 is opened by the second valve control function, and there is a disadvantage that the hot water circulates.

However, when the hot water faucet 9 is opened, the first
The opening / closing solenoid valve 11 is preferentially closed by the valve control function described above, and the circulation of hot water is prevented. Further, in the case where the hot water supply conduit 7 and the return conduit 8 have a double pipe structure as in the present embodiment, the heat radiation of the hot water flowing in the hot water supply conduit 7 can be suppressed, which is extremely effective in heat retention measures.

FIG. 2 shows a second embodiment of the present invention.
The hot water supply conduit 7 and the return conduit 8 do not have a double-pipe structure as in the above embodiment, but are formed as a single pipe. That is, the downstream end of the hot water supply pipe 7 is directly connected to the hot water tap 9, and the upstream end of the return pipe 8 is connected to the hot water supply pipe 7 near the hot water tap 9.
It is a branch from.

Since other structures are the same as those of the first embodiment, the same parts are denoted by the same reference numerals and the description thereof will be omitted. Also in the second embodiment, functions and effects other than the functions and effects of the double tube structure of the above-described embodiment can be exhibited.

[0030]

As described above, according to the present invention, even when the hot water faucet is opened after not using the hot water for a long time, the hot water of the predetermined temperature flows out immediately.

Therefore, as compared with the conventional method in which hot water is discharged after a certain amount of cold water is discharged, the hot water can be used quickly and conveniently, and the wasteful use of water is reduced. In addition, when the inside of the conduit reaches a predetermined temperature or higher, the circulation of hot water stops and the heating action is stopped. Therefore, heat energy loss is less than that in a case where hot water is circulated in a constantly heated state, which is effective in energy saving measures. . And open the hot water faucet and use hot water for a long time
The first valve control unit does not
The opening / closing solenoid valve is preferentially closed by the function to circulate hot water.
This is an energy saving measure from this aspect.

Further, according to the double pipe structure, the heat radiation of the hot water is suppressed, which is more effective for energy saving measures.

[Brief description of the drawings]

FIG. 1 is a piping diagram showing a first embodiment of the present invention.

FIG. 2 is a piping diagram showing a second embodiment of the present invention.

FIG. 3 is a diagram showing a conventional pipe.

[Explanation of symbols]

 Reference Signs List 6 hot water supply device 7 hot water supply conduit 8 return conduit 9 hot water faucet 10 flow meter 11 opening / closing solenoid valve 12 controller 13 temperature sensor

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kazuhisa Igawa 4-1-2 Hirano-cho, Chuo-ku, Osaka City Inside Osaka Gas Co., Ltd. (72) Inventor Masaaki Nomura 1-chome 1-2-cho, Atsuta-ku, Nagoya, Aichi No. 70 Aichi Watch Electric Co., Ltd. (72) Inventor Shinji Ito 2-70 Aichi Prefecture, Nagoya City, Atsuta-ku 2-chome No. 70 No. 70 Aichi Watch Electric Co., Ltd. No. 2 No. 70 Aichi Watch Electric Co., Ltd. (72) Inventor Yoshinori Fujiwara No. 2-70, Chitose 1-chome, Atsuta-ku, Nagoya-shi, Aichi Pref. U) (58) Field surveyed (Int. Cl. ⁷ , DB name) F24H 1/14 F24H 1/10 302

Claims (2)

(57) [Claims] 1. A hot water supply pipe (6) is provided with a hot water supply pipe (7) and a return pipe (8), and a downstream end of the hot water supply pipe (7) and an upstream end of the return pipe (8) are connected to a hot water tap (9). The hot water supply conduit (7) is provided with a flow meter (10), and the return conduit (8) is provided with an on-off solenoid valve (11) for opening and closing the pipe (8). A temperature sensor (13) for detecting the temperature of the hot water in the pipe (8);
Based on the flow rate signal and the temperature signal from the temperature sensor (13) from 0) a controller (12) for opening and closing controls the opening and closing solenoid valve (11), to said controller (12)
Means that the open / close solenoid valve (11) is open and the hot water faucet is
(9) Flow meter when hot water is circulated in closed state (10)
The instantaneous flow rate is stored, and whether the open / close solenoid valve (11) is open
Hot water faucet (9) is opened and instantaneous flow meter (10)
When the flow rate exceeds the instantaneous flow rate stored above
First valve that sends a closing operation signal to the on-off solenoid valve (11)
Control function and the temperature of hot water in the return conduit (8) is lower than a predetermined temperature.
When the temperature becomes low and this is detected by the temperature sensor (13)
In this case, an open signal is sent to the on-off solenoid valve (11) to
The temperature became too high and the temperature sensor (13) detected it
Second valve that sends a close signal to the on-off solenoid valve (11) in case
The control function is incorporated, and the valve opening finger by the temperature sensor (13)
Opening and closing solenoid valve by the first valve control function
An instant hot water device in a hot water supply system, wherein (11) is closed . 2. A hot water supply pipe (7) is returned to the water heater (6).
A conduit (8) is laid, and the downstream end of the hot water supply conduit (7) is connected to the return line.
Connect the upstream end of the pipe (8) near the hot water faucet (9).
Flow meter (10) installed in hot water supply conduit (7)
The return conduit (8) has an open / close switch for opening and closing the pipe (8).
Magnetic valve (11) and temperature for detecting the hot water temperature in the pipe (8)
A sensor (13), and the flow meter (1)
0) and the temperature signal from the temperature sensor (13)
For controlling the opening and closing of the open / close solenoid valve (11) based on the
Equipped with a troller (12), and the two pipes (7) and (8)
An instant hot water device in a hot water supply system having a double pipe structure in which a hot water supply conduit (7) is located inside.