JPS5856501Y2 - Ventilation fan control device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a control device for a ventilation fan that discharges exhaust gas generated from, for example, a water heater.

Conventionally, this type of device operated the ventilation fan by changing the pressure of the gas flowing in the gas pipe when the water heater was in use, or by detecting the temperature of the exhaust gas, so the pilot burner and main burner were both ignited. In either case,
A method in which the ventilation fan operates or a method in which the ventilation fan operates only when one main burner is ignited was adopted, but in the former method, the ventilation fan is always operated when one pilot burner is ignited even though the amount of exhaust gas is small. In the latter method, the ventilation fan was not operated while the pilot burner was ignited, so if this state continued for a long time, the room would be filled with exhaust gas.

In order to eliminate these drawbacks, this invention
The amount of ventilation by the ventilation fan is controlled according to the ignition of the main burner.

To this end, this invention operates a ventilation fan in conjunction with a gas appliance, and includes: a motor that rotationally drives a ventilation fan; a first detection means that detects when a pilot burner of the gas appliance is being ignited; A timer is provided which repeatedly controls the motor to be operated and stopped in a low-speed cycle in a cycle of a predetermined time by the detection operation of the first detection means, and a second detection means is provided which detects when the main burner of the power source device is being ignited. A normally closed contact is provided between the timer and the weak operation terminal of the motor, and a relay coil is provided that energizes this normally closed contact when the second detection means is energized.

Hereinafter, this invention will be explained in detail with reference to one embodiment shown in the drawings.

The figure shows one embodiment of the present invention, and 1 is a first temperature detection element as a first detection means installed near a pilot burner (not shown) of a gas appliance, which detects the temperature of the pilot burner. , two contacts IA, I that perform switch operation
It has B.

A second detection unit 2 detects the temperature of the main burner (not shown) of the gas appliance, performs a switch operation, and connects the commercial power supply 9 to the strong operation terminal 7 of the motor 6 that rotationally drives the ventilation blower blades. The second temperature detecting element 3 serving as a means is a timer that repeatedly controls the ventilation fan to be weakly operated and stopped in a cycle of a certain period of time by the detecting operation of the first temperature detecting element 1.

Next, to explain the wiring, one end of the second temperature sensing element 2 is connected to the commercial power supply 9, and the other end is the high operation terminal 7 of the ventilation motor 6.
It is connected to the.

One end of the contact IA of the first temperature sensing element 1 is connected to a commercial power source 9, and the other end is connected to a weak operation terminal 8 of a motor 6 via a timer 3 and a normally closed contact 4.

The power supply circuit of the timer 3 is connected to a commercial power source 9 via the contact 1B of the first temperature sensing element 1, and the relay coil 5 that energizes the normally closed contact 4 is activated when the second temperature sensing element 2 is energized. , are connected so that a voltage is applied to open the normally closed contact 4.

Next, the operation will be explained.

When the pilot burner is ignited, the first temperature sensing element 1 detects the temperature and the contacts IA and IB are closed, so that the power supply circuit to the timer 3 is also closed.

Therefore, a voltage is repeatedly applied to the low operation terminal 8 of the motor 6 for a certain period of time according to the cycle of the timer 3, and the ventilation fan repeatedly enters low operation and stops.

Next, when the main burner is ignited, the second temperature sensing element 2 detects the temperature and closes the energizing circuit.

At this time, since the relay coil 5 is connected so that a voltage is applied, the normally closed contact 4 is opened to cut off the energization circuit to the weak operation terminal 8 of the motor 6, and the second temperature detection element 2, a voltage is applied to the high operation terminal 7 of the motor 6, and the ventilation fan is connected to high operation while the main burner is ignited.

When the main burner goes out in this state, the voltage applied to the relay coil 5 is cut off, the normally closed contact 4 is closed, and the voltage is intermittently applied to the low operation terminal 8 of the motor 6 via the timer 3. As a result, the motor 6 repeats weak operation and stopping.

In other words, the ventilation fan repeatedly runs at low speed and then stops.

When neither the pilot nor the main burner is ignited, the power circuit to the strong operation terminal 7 and weak operation terminal 8 of the motor 6 is cut off, and the ventilation fan completely stops operating.

Because of this effect, not only does the ventilation fan operate while either the pilot burner or the main burner is ignited, but also the ventilation fan runs weakly or stops when only one pilot burner is ignited (when the amount of exhaust gas is low). This process is repeated in a certain cycle, and when the main burner is on (when there is a large amount of exhaust gas), the ventilation fan continues to operate at high power, effectively discharging the exhaust gas, and the operation is automatic by operating the water heater. This has great practical effects, such as the fact that ventilation fans can be operated.

In addition, although the case of a water heater has been described above, this invention is not limited to this, and may be used for a gas boiler used for a bath.

As described above, according to this invention, depending on the ignition status of the pilot and main burners, it is automatically detected whether the ventilation fan should be operated at low operation speed, repeatedly running and stopping in a certain cycle, or whether it should be continued at high operation. Since the ventilation fan can be controlled, not only is ventilation always satisfactory for the amount of exhaust gas generated, but also unnecessary ventilation is not performed.
It has the advantage of being less affected by room temperature due to ventilation in winter and summer.

[Brief explanation of drawings]

The figure is a circuit diagram showing an embodiment of the present invention. In the figure, 1 is a pilot burner temperature detection element (first detection means), 2 is a main burner temperature detection element (second detection means), 3 is a timer, 5 is a relay coil, 4 is a normally closed contact, 6 is a motor, 7 is a strong operation terminal, 8 is a weak operation terminal, and 9 is a commercial power supply.

Claims (1)

[Scope of utility model registration request] The ventilation fan is operated in conjunction with a gas appliance, and includes a motor that rotationally drives a ventilation fan, a first detection means that detects whether a pilot burner of the gas appliance is being ignited, and the first detection means. A timer is provided for repeatedly controlling the motor to stop and run at a low speed in a cycle of a certain period of time by the detection operation of the means, and a second detection means is provided for detecting when one main burner of the gas appliance is being ignited. A control device for a ventilation fan comprising a normally closed contact between the weak operation terminal and a relay coil that energizes the normally closed contact when the second detection means is energized.