JPS6112515Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to an instantaneous hot water storage type water heater.

(Conventional technology and problems) Conventionally, a bypass pipe was installed in the water pipe leading from the water inlet to the hot water tap via the heat exchanger, bypassing the heat exchanger and connecting to the hot water tap via a pump. , as shown in Utility Model Application Publication No. 54-153042, but in this, the circulation pump is constantly driven,
If there is a long period of time between hot water supply being stopped and hot water being re-supplied, the heat exchanger 3 becomes a radiator and therefore the frequency of opening and closing of the solenoid valve 10 increases, resulting in an increase in fuel consumption and waste. It was energy consuming.

The present invention solves the above problems, reduces fuel consumption, saves energy, and enables instantaneous hot water supply.

(Example) 1 is an instant hot water storage type water heater, and a water pipe 5 from a water inlet 2 to a hot water tap 4 via a heat exchanger 3 has a bypass connected to the hot water tap 4 by bypassing the heat exchanger 3. A pipe 6 is provided through a pump 7, and a temperature detector 8 such as a thermistor that detects the temperature of hot water drives and controls the opening and closing of a solenoid valve 11 disposed in a fuel supply passage 10 leading to the pump 7 and a burner 9 such as a gas burner. There is.

FIG. 2 is an electrical circuit diagram of the same, in which 12 is a power switch, and 13 is an open/close switch that is opened and closed by the temperature detector 8, which closes when the temperature is below a set temperature and opens when the temperature exceeds the set temperature. Reference numeral 14 denotes a manual changeover switch, which is normally located on the contact B side. When switched to the A side, the open/close switch 13, the changeover switch 14, and the pump 7 are connected in series, and the changeover switch 14 and the pump 7 are connected in series.
The solenoid valve 11 is connected in parallel to the circuit consisting of the following.

The present embodiment has such a configuration, and its operation will be explained next.

When using normal hot water supply, the changeover switch 14 is set to the contact B side, and when the power switch 12 is turned on, the initial hot water temperature is low, so the on/off switch 13 is closed, the pump 7 is driven, and the solenoid valve 11 is opened and the burner is turned on. 9 is ignited to start heating by circulation, and at this time, when the hot water tap 3 is opened, high-temperature water is instantly supplied. When hot water supply is stopped, the hot water in the pipe is maintained at a high temperature by the temperature detector 8, and instantaneous hot water supply can be performed again by the pump 7 without being affected by water pressure. If there is a long period of time between stopping the hot water supply and re-supplying the hot water, the changeover switch 14 may be manually switched to the contact A side.

Then, when the water temperature exceeds the setting, the open/close switch 1
3 opens, and the pump 7 and the solenoid valve 11 are shut off and stopped at the same time.

(Effects of the invention) In this way, the present invention provides a manual changeover switch that has two contacts and is connected in series with the pump. The circuit consisting of the switch is connected in parallel to the power supply, and after the changeover switch is switched, the open/close switch, the changeover switch, and the pump are connected in series, and the solenoid valve is connected in parallel to the circuit consisting of the changeover switch and pump. This not only makes it possible to provide instant hot water even if the hot water tap is located in a remote location, but also reduces fuel consumption and saves energy.

[Brief explanation of the drawing]

FIG. 1 is an overall view showing an embodiment of the present invention, and FIG. 2 is an electrical circuit diagram of FIG. 1. 1... Instant hot water storage type water heater, 2... Water inlet, 3...
...Heat exchanger, 4...Hot water tap, 5...Water pipe, 6...
... Bypass pipe, 7 ... Pump, 8 ... Temperature detector, 9 ... Burner, 10 ... Fuel supply passage, 11
... Solenoid valve, 12 ... Power switch, 13 ... Open/close switch, 14 ... Changeover switch.

Claims (1)

[Scope of utility model registration request] A bypass pipe that bypasses the heat exchanger and connects to the hot water tap is installed in the water pipe that runs from the water inlet to the hot water tap via the heat exchanger via a pump, and a temperature detector such as a thermistor that detects the hot water temperature is used. In devices that drive and control the opening and closing of solenoid valves arranged in fuel supply passages leading to pumps and burners, normally a circuit consisting of a changeover switch and a pump, and a circuit consisting of an on-off switch and a solenoid valve are connected in parallel to a power source. The instant hot water storage device is characterized in that, after the changeover switch is changed, the open/close switch, the changeover switch, and the pump are connected in series, and a changeover switch is provided that connects a solenoid valve in parallel to a circuit consisting of the changeover switch and the pump. type water heater.