JPS592407Y2 - Ventilation fan interlocking device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a ventilation fan interlocking device mainly used in a gas instantaneous water heater.

In recent years, there has been considerable progress in making residential buildings airtight, so in general household and other relatively small gas instantaneous water heaters that do not have exhaust pipes that communicate with the outdoors, the combustion exhaust gas is emitted indoors instead of being exhausted outdoors. This results in a lack of oxygen indoors and an increase in carbon dioxide and carbon monoxide.
There were many problems from a safety standpoint.

For this reason, in addition to starting the ventilation fan when the water heater is burning,
It is necessary to install a device inside the vessel to stop the fire when the fire is extinguished.

The purpose of the present invention is to provide a ventilation fan interlocking device that satisfies the above requirements.A pair of thermocouples are connected in series to the electric circuit of the ventilation fan, one thermocouple is connected to the pilot burner, and the other thermocouple is connected to the pilot burner. The present invention is characterized in that thermocouples are disposed opposite to the main burners so that each burner generates heat, and the ventilation fan is started and stopped by detecting an increase in the electromotive force generated by the thermoelectric lamp.

An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, 1 is a gas supply pipe, 2 is an electromagnetic valve that is provided in the gas supply pipe 1 and opens and closes the gas supply pipe 1 in conjunction with an electromagnet 2a, and 3 is a gas supply pipe connected via a main gas valve 7. 1 is a main burner connected to the gas supply pipe 1, 4 is a pilot burner connected to the gas supply pipe 1, 5.6 is a thermocouple installed opposite to the main burner 3 and the pilot burner 4, respectively; 6 is connected in series to the controller 8.

Further, a plug 10 is connected to the controller 8, and the electromagnet 2a is connected via a contact 9, and a contact 1
A ventilation fan 13 is connected via 1.12.

14 is a water supply pipe, 15 is a water supply valve provided in the water supply pipe 14,
16 is a water pressure regulator connected to the water supply pipe 14, and 17 is a pressure receiving body, such as a diaphragm, housed in the water pressure regulator 16 and connected to the main gas valve 7.

18 is a heat exchanger connected to a water supply pipe 19 connected to the water pressure regulator 16, and 20 is a hot water outlet pipe connected to the heat exchanger 18.

Next, the operation of this embodiment having the above structure will be explained.

When the solenoid valve 2 is manually operated to supply gas to the pilot burner 4 and ignite it, the pilot burner 4 generates a flame.

Since the thermocouple 6 is heated by this flame, an electromotive force is generated and a voltage V1 is obtained (see FIG. 2).

At this voltage (1), the contact 9 is closed via the controller 8, so the electromagnet 2a is energized, the solenoid valve 2 is kept open, and the gas supply pipe 1 remains open.

Therefore, the gas is supplied to the pilot flame parna 4, and its combustion is continued.

Next, when the water supply valve 15 of the water supply pipe 14 is opened to supply water, the diaphragm 17 receives pressure and is displaced (to the right), and the main gas valve 7 is accordingly opened, and gas is supplied to the main burner 3 for combustion. do.

The flame generated by this combustion heats the thermocouple 5 and generates an electromotive force, and this electromotive force is added to the electromotive force of the thermocouple 6, so that the voltage becomes V2.

(See Figure 2). At this voltage (2), the contact 11 is closed via the controller 8, so the ventilation fan 13 is activated.

When the water supply valve 15 is closed to stop the water supply, the diaphragm 17 of the water pressure regulator 16 moves to the left and returns to its original state, so the main gas valve 7 is closed and the gas to the main burner 3 is closed. supply will be stopped.

Therefore, since the flame of the main burner 5 is extinguished, the thermocouple 5 is cooled by the atmosphere and its voltage decreases.

When the voltage drops below 2, the contact 11 is opened via the controller 8, and the ventilation fan 13 is stopped.

Furthermore, when the solenoid valve 2 is manually closed to extinguish the pilot burner 4 and when the flame of the pilot burner 4 is extinguished, the electromotive force of the thermocouple 6 is eliminated.

When the voltage drops below 1, the contact 9 is opened via the controller 8, and the electromagnet 2a is demagnetized.

Since the electromagnetic valve 2 is closed by this demagnetization, the supply of gas in the gas supply pipe 1 is cut off.

Further, even when the water heater is not in use, the ventilation fan 13 can be operated and stopped by operating the switch 12.

As explained above, in the present invention, a pair of thermocouples are arranged in series, and when a water heater is used, one of the thermoelectric lamps is placed opposite to the main burner, which has a large amount of combustion heat, to heat the water heater. , it is possible to quickly start up the ventilation fan by making the rise of the electromotive force rapid.

Further, according to the present invention, the thermocouple heated by the flame of the main burner becomes a voltage (2) that immediately sends a signal instructing the ventilation fan to stop when the hot water supply is stopped.

The reason for this is that thermocouples have the characteristic that by raising the temperature of the hot junction, the voltage drops quickly to a certain level when the flame, which is the heating source, disappears.

Furthermore, the present invention uses a thermocouple to detect the presence or absence of flame in the main burner and starts and stops the ventilation fan, so there is no risk of malfunction.

Furthermore, according to the present invention, the opening/closing response speed of the contacts 9 and 11 provided in the electric circuit of the solenoid valve and the ventilation fan, respectively, is determined by the installation position of the thermocouple, that is, the generated electromotive force and the set voltage V1.
This is an advantage that can be arbitrarily selected by V2.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing an embodiment of the ventilation fan communication device of the present invention, and FIG. 2 is a diagram showing the voltage characteristics of a thermocouple used in the present invention. 3... Main burner, 4... Pilot burner, 6, 7... Thermocouple, 12... Ventilation fan.

Claims (1)

[Scope of utility model registration request] A controller 8 and a contact 11 are connected in series to the electric circuit of the ventilation fan 13, a pair of thermocouples 5.6 are connected in series to the controller 8, and one of the thermocouples 6 is connected to the pilot burner 4. The other thermocouple 5 is arranged opposite to the main burner 3, and a controller 8 has a function of starting and stopping the ventilation fan 13 by detecting an increase or decrease in the electromotive force generated by the thermocouples 5 and 6. A ventilating fan interlocking device characterized by being placed on a side.