JPS6034911Y2 - Hot water heating system - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a hot water supply and heating system, and this will be explained in detail based on an embodiment of the drawings. It communicates with the tank 3 placed above to create a natural circulation path.

A heating pipe 4 includes a pump 5 and a radiator 6.

7 is a hot water supply coil arranged inside the tank 3.

Two gas burners 8 and 9 are arranged below the heating heat exchanger 1, and solenoid valves 12 and 13 are provided in the gas supply pipes 10 and 11 that lead to the two gas burners 8 and 9.

14 is a pilot burner, 15 is a pilot supply pipe 16
This is a pilot solenoid valve installed in the

Reference numeral 17 denotes a pilot flame detection device in which a detection unit 18 is disposed near the pilot burner 14, and 19 is an ignition device in which an ignition unit 20 is disposed in the vicinity of the pilot burner 14.

A thermoswitch 21.22 is connected in series to the solenoid valve 12.13, and the thermoswitch 21.22 is connected to a temperature detector 23.24 such as a thermistor in the communication path 2.
Opening/closing is controlled by a temperature detection amplifier 25'26'.

The temperature detector 23 is set at a high temperature so as to operate under low loads, and the temperature detector 24 is set at a lower temperature than the temperature detector 23 so as to operate under high loads.

25 is a changeover switch 26 and an ignition switch 27 that are linked together.
When the push button 28 is not pressed, the changeover switch 26 closes the first contact 29 on the solenoid valve 12.13 side and opens the ignition switch 27, and when the pushbutton 28 is pressed, the changeover switch 26 closes the first contact 29 on the side of the solenoid valve 12.13 and opens the changeover switch 26. The solenoid valve 15 and the second contact 30 on the pilot flame detection device 17 side are closed, and the ignition switch 27 is closed.

A switch 31 is opened and closed by the pilot flame detection device 17, and is connected in parallel with the second contact 30.

32 is a stop switch connected in series with the start switch 25; 33 is a heating switch connected in series with the pump 5; the heating switch 33 and the pump 5 are connected in parallel to the stop switch 32.

34 is a bi-limit switch attached to the communication path 2 wall, 3
5 is a level switch arranged inside the tank 3, and 36 and 37 are indicator lamps.

Reference numeral 38 denotes a remote control unit equipped with a starting switch 25 and the like.

Since the present invention is structured as described above, its operation will be explained next. First, when the push button 28 is pressed to operate the start switch 25, the changeover switch 26 is activated.
The contact 30 is closed and the ignition switch 27 is also closed.

As a result, the pilot electromagnetic valve 15 opens, gas is supplied to the pilot burner 14, and the ignition device 19 is activated to discharge sparks from the ignition section 20, starting pilot combustion.

When the detection unit 18 detects this pilot flame, the switch 31 is closed by the action of the pilot flame detection device 17, so even if the push button 28 is released and the changeover switch 26 is switched from the second contact 30 to the first contact 29, , switch 3
1 is closed, the pilot burner 14 continues combustion, and since the ignition switch 27 is open, spark discharge from the ignition section 20 is stopped.

Here, since the first contact 29 and the switch 31 are closed, the solenoid valve 12.13 is opened, and the pilot flame ignites the gas burner 8.9 to start main combustion and heat the heating heat exchanger 1. When the water temperature reaches the set temperature of the temperature detector 24, the thermoswitch 22 opens, which closes the solenoid valve 13. When the water temperature rises further and reaches the set temperature of the temperature detector 23, the thermoswitch 21 opens, so the solenoid valve closes. 12 is closed, and the gas burners 8 and 9 stop combustion.

If you are currently using bulk hot water supply alone, or if you close the heating switch 33 and operate the pump 5 and also use heating (during high load), the water temperature in the tank 3 will drop to the temperature set by the temperature detector 24. Therefore, the thermo switches 21 and 22 close again, and the solenoid valves 12 and 13 open one after another (and the gas burners 8 and 9 burn, and the water temperature rises. From then on, the gas burners δ and 9 repeatedly blink as appropriate. be.

In addition, when using only a small amount of hot water supply or only heating (during low load), the temperature of the water in the tank 3 drops to the set temperature of the temperature detector 23, so the thermo switch 21 closes again.
The solenoid valve 12 opens, the gas burner 8 burns, and the temperature rises, and thereafter the gas burner 8 repeatedly blinks as appropriate.

To stop using the appliance, press the stop switch 32 to open it, and current will stop flowing through all circuits.
The switch 31 is open and the appliance will not be reactivated even if the stop switch 32 is released.

Further, the pump 5 is stopped when the heating switch 33 is opened.

Although two temperature detectors 23 and 24 are used in this embodiment, one temperature detector 39 may be used as shown in FIG. Proportional control may also be performed using , which simplifies the structure and can be provided at low cost.

The embodiments of the present invention are not limited to these, and various combinations are possible.

The present invention thus provides a heating circuit having a heating heat exchanger and a hot water supply circuit having a hot water supply coil disposed within the heating circuit, and at least two gas burners for heating the heat exchanger. Gas valves are installed in each gas supply pipe leading to the gas burner, and these gas valves are controlled at different set temperatures by temperature detectors placed at appropriate locations on the heat exchanger, which makes this type of system easier to use than conventional systems. The number of blinks of the gas burner is reduced (especially at low loads), the operation becomes smoother, the durability of the device is improved, and the temperature characteristics are also improved.

This effect becomes even more remarkable when the gas valve is a proportional control valve.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; Fig. 1 is an overall configuration diagram, Fig. 2 is an electric circuit diagram, and Fig. 3 is a temperature characteristic diagram for one hour. This idea (at low load)
It shows. FIG. 4 is an electrical circuit diagram of a temperature detector portion showing another embodiment. 1...Heat exchanger, 4...Heating circuit, 7
...Hot water circuit, 8, 9...Gas burner, 10,11...Gas supply pipe, 12,13...
...Gas valve, 23,24°38...Temperature detector.

Claims (2)

[Scope of utility model registration request] (1) A tank is provided above, and a heating circuit has a heating heat exchanger connected to the tank through a communication path to form a natural circulation path, and an indirect heating type hot water supply coil arranged inside the tank. In an indirect two-circuit system equipped with a hot water supply circuit, at least two gas burners are arranged to heat the heat exchanger, gas valves are installed in the gas supply pipes leading to these gas burners, and these gas valves are connected to the heat exchanger. 1. A hot water supply and heating device characterized in that different settings are controlled by temperature detectors disposed in a communication path leading to an exchanger. (2) The hot water supply and heating device according to claim 1 of the utility model registration claim, in which the gas valve is a proportional control valve.