JP3605816B2 - Water heater with instant hot water function - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a hot water supply device with a hot water function, and more particularly to a hot water supply device capable of easily and reliably determining use of a hot water tap.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, as this type of technology, there is a hot water supply device having an instant hot water function as shown in FIG. In the hot water supply device 1 with the hot water function, the water supplied through the water supply channel 2 is heated by the heat exchanger 3 and supplied from the hot water supply channel 4 to the hot water tap 5. Further, the water that has entered from the water inlet channel 2 is guided from the bypass channel 10 to the hot water channel 4 without passing through the heat exchanger 3, and the flow rate from the bypass channel 10 is adjusted by a proportional valve 11 provided on the bypass channel 10. Then, the temperature at which hot water is supplied from hot water tap 5 is adjusted. Further, a hot water supply return path 6 is connected from the hot water path 4 to the water inlet path 2 side, and a circulation pump 7 is provided.
In such a water heater, the fact that the hot water tap 5 is opened and the hot water is supplied is detected by the water volume sensor 8 for detecting the flow rate flowing into the heat exchanger 3 and the hot water return path 6. The circulating water amount sensor 9 for detecting the flowing flow rate is used, and the determination is made by comparing the two water amount sensors 8 and 9. More specifically, when the hot water tap 5 is closed, the detection values of the can body water sensor 8 and the circulating water sensor 9 match. On the other hand, when the hot-water tap 5 is opened, water is supplied from the water inlet channel 2, so that the detection value of the can body water sensor 8 is larger than the detection value of the circulating water sensor 9. The use of the hot water tap 5 can be determined by detecting these.
[0003]
[Problems to be solved by the invention]
Conventionally, there is such a water heater with a hot water function. However, in the conventional one, when a hot water tap is used during the operation of the hot water function, it is necessary to determine the use of the hot water tap from the flow rate difference between the two water quantity sensors. Therefore, a certain flow rate difference is required in consideration of variations in sensors and the like. Therefore, when the hot water tap is used at a flow rate equal to or lower than the determination flow rate, the hot water supply state is not determined, and there is a problem that tapping is performed at a temperature not set. Further, in this conventional device, mutual adjustment was necessary because two water flow sensors were used.
Therefore, the present invention has been made in view of these problems, and an object of the present invention is to provide a hot water supply device with a quick hot water function that has a simpler configuration and improves the accuracy of hot water tap use determination.
[0004]
[Means for Solving the Problems]
In order to achieve the above object, the invention according to claim 1 includes an inlet channel for supplying water, a heating unit for heating the supplied water, and a tap channel for supplying hot water heated by the heating unit to a hot water tap. And a hot water supply return path for returning hot water from the hot water path to the water inlet path side, thereby forming a hot water circulation path, and further having a circulation pump provided in the hot water circulation path. In the water heater, an inlet water temperature sensor is provided on the water inlet channel and downstream of a connection portion between the water inlet channel and the hot water supply return channel, and monitors a temperature detected by the inlet water temperature sensor during operation of the hot water function. It is determined that the use of the hot water tap has been started due to a decrease in the temperature .
[0005]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a configuration of a hot water supply device with an instant hot water function of the present invention. As shown in FIG. 1, this hot water supply device with hot water function has a function that water supplied from a water inlet 2 is heated by a heat exchanger 3 to reach a hot water outlet 4 and is adjusted by a proportional valve 11 by a bypass 10. Reaches the hot water supply path 4, and they are mixed and discharged from the hot water supply path 4. A hot water supply return path 6 is provided from the hot water supply path 4 to the hot water tap 5 and returned from the hot water supply path 4 to the water inlet path 2, and the return path 6 is provided with a circulation pump 7. . Further, in this water heater, an incoming water temperature sensor 12 is disposed downstream of a connection point between the incoming water passage 2 and the return passage 6.
In such a water heater, it is possible to detect that the hot water tap 5 is opened by detecting a temporary decrease in the temperature of the incoming water temperature sensor 12. When the hot water function is operating, the hot water supply path 4, the return path 6, the water supply path 2, and the heat exchanger 3 are circulated to keep the temperature warm. Therefore, the water supply temperature sensor 12 detects a substantially constant temperature. ing. At this time, when the hot-water tap 5 is opened, the same amount of water as the hot-water tap comes out is supplied from the water inlet channel 2, so that the incoming water temperature sensor 12 detects a decrease in temperature. By detecting this state, the use of the hot water tap can be detected.
[0006]
【The invention's effect】
As described above, in the water heater with the hot water function of the present invention, the water temperature sensor is provided on the downstream side of the connection portion between the water supply channel for supplying water and the hot water supply return channel, and the water temperature sensor detects a decrease in temperature. Thus, since the use of the hot water tap is determined, there is an effect that it is possible to detect even a flow rate that cannot be determined by the flow rate difference of the sensor as in the related art.
In addition, since the inlet water channel is provided with an inlet water temperature sensor for calculating the amount of normal combustion, the use of the sensor also serves as an effect of reducing the number of additional components.
[Brief description of the drawings]
FIG. 1 is an explanatory view of a hot water supply device with a quick hot water function.
FIG. 2 is an explanatory diagram of a conventional technique.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Hot water supply 2 Water inlet 3 Heat exchanger 4 Hot water outlet 5 Hot water tap 6 Hot water return 7 Circulating pump 10 Bypass 11 Proportional valve 12 Water temperature sensor

Claims (1)

A water supply channel for supplying water, a heating means for heating the supplied water, a hot water supply path for supplying hot water heated by the heating means to a hot water tap, and a hot water supply return for returning hot water from the hot water supply path to the water supply channel side. And a hot water circulation device having a hot water circulation path formed by the hot water circulation path and a circulation pump provided in the hot water circulation path. A water inlet temperature sensor is provided downstream of the connection part, and while the hot water function is operating, the detection temperature of the water inlet temperature sensor is monitored and the use of the hot water tap is started due to a decrease in the detected temperature. Water heater with a hot water function, characterized by determining

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