JPS5934818Y2 - Water temperature control device for water heater - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a water heater and a hot water temperature control device in a hot water supply pipe.

In conventional water heaters, if the hot water pipe is longer than the water heater to the hot water tap, the temperature of the hot water in the hot water pipe will drop due to heat radiation, so even if you open the hot water tap, the cold water in the hot water pipe will not drain until it is discharged. The drawback was that there was no hot water.

This idea solves the above-mentioned drawbacks of conventional water heaters by installing a reflux pipe in parallel with the hot water supply pipe, and installing a circulation pump and electric heater in this reflux pipe to continue supplying hot water even when the water heater is not in use. To provide a device that circulates water between a pipe and a reflux pipe and heats it with an electric heater so that hot water in the hot water supply pipe comes out at the same time as hot water supply starts.

The details of this invention will be explained below based on the attached drawings.

In the figure, 1 is a water heater, 2 is its water supply pipe, 3 is a heat exchanger, and 4 is a hot water supply pipe connected to its outlet.

5 is a gas burner that heats the heat exchanger 3, and 6 is a solenoid valve for controlling the burner provided in the gas supply pipe.

7 is a plurality of hot water taps provided in the hot water supply pipe 4; 8 is a return pipe connected in parallel with the hot water supply pipe 4; this pipe 8 is thinner than the hot water supply pipe 4;

This reflux pipe 8 is provided with a circulation pump 9 and an electric heater 10.

Further, the water supply pipe 2 is provided with a flow switch 11, and the hot water supply pipe 4 is provided with a thermostat 12.

FIG. 2 shows an electric circuit, where 13 is a power supply circuit, and one terminal of the motor of the circulation pump 9, one terminal of the heater 10, and one terminal of the coil of the solenoid valve 6 are connected to one power supply circuit, respectively. Connect to 13.

Further, one terminal of the thermostat 12 is connected to the power supply end terminal of the flow inch 11, and the other terminal is connected to the other power supply circuit 13.

The flow switch 11 has two switching contacts 14 and 15, a movable contact 16 is attached to the terminal on the thermostat 12 side, the contact 14 is connected to the other terminal of the coil of the electromagnetic valve 6, and the contact 15 is connected to the other terminal of the coil of the electromagnetic valve 6. It is connected to the other terminal of the motor of the circulation pump 9 and the other terminal of the heater 10 .

Further, it is assumed that the movable contact 16 of the flow switch 11 contacts the contact 15 when no flow is detected, and contacts the contact 14 when a flow is detected.

This invention has the above-mentioned structure, and no water flow occurs in the water supply pipe 2 when each hot water tap 7 is closed.

Therefore, the movable contact 16 of the flow switch 11 is the contact 15
Since the motors of the heater 10 and the pump 9 are in contact with each other, current flows through the motors of the heater 10 and the pump 9, and the water in the hot water supply pipe 4 and the return pipe 8 circulates and is heated by the heater 10, and the heater 10 and the pump 9 are controlled by the thermostat to maintain a constant temperature. Temperature hot water is pipe 4,
The hot water in the hot water supply pipe 4 is kept warm by circulating between the hot water supply pipes 8 and 8.

In this state, when any hot water tap I is opened to start hot water supply, the hot water in the hot water supply pipe 4 is immediately discharged, and at the same time a water flow is generated in the water supply pipe 2, which is detected by the flow switch 1.
1's movable contact 16 contacts the switching contact 14, the current to the pump 9 and heater 10 is cut off, current flows through the coil of the solenoid valve 6, the valve opens, and gas is sent to the burner 5, which is ignited by the pilot flame. water flowing through the heat exchanger 3 is heated.

In this case as well, the thermostand 12 controls the electromagnetic valve 6 to keep the water temperature constant.

This invention performs the above-mentioned function, but the hot water tap 7
When it is closed, current is passed through the circulation pump 9 and heater 10 to heat the circulating water, so hot water at a predetermined temperature comes out at the same time as hot water supply starts.

In addition, since the flow switch operates to cut off the current to the pump 9 and heater 10 at the start of hot water supply, there is no possibility that current will flow unnecessarily to the pump 9 and heater 10 during hot water supply.

Further, since the pump 9, heater 10, and electromagnetic valve 11 are controlled by the thermostat 12 provided in the hot water supply pipe 4, there is an effect that the hot water temperature is the same in the case of keeping warm and in the case of hot water supply.

[Brief explanation of drawings]

FIG. 1 is a piping diagram of the control device of this invention, and FIG. 2 is an electric circuit diagram. 1...Water boiler, 2...Water pipe, 3...
...Heat exchanger, 4...Hot water pipe, 5...
...Gas burner, 6...Solenoid valve, 7...
Hot water tap, 8...reflux pipe, 9...circulation pump, 10...electric heater, 11...
Flow switch, 12...Thermostat, 1
3...Power supply circuit.

Claims (1)

[Scope of utility model registration request] A reflux pipe is installed in parallel with the hot water pipe from the water heater to the hot water tap, and the reflux pipe is equipped with a circulation pump and an electric heater.
In the water supply pipe of the water heater, when no water flow is detected, a power supply is connected to the electric heater and the circulation pump, and when a water flow is detected, the power is connected to the solenoid valve for controlling the gas burner of the water heater, and this solenoid valve is activated. A flow inch to open is provided, and a solenoid valve for controlling the electric heater and the gas burner of the water heater is controlled in a part of the water supply pipe where water flows through the reflux pipe. A water heater temperature control device equipped with a thermostat that maintains a constant temperature of water flowing through the water heater.