JPS5823090Y2 - Ventilation fan interlocking device - Google Patents

Description

[Detailed description of the invention] This invention relates to a ventilation fan interlocking device for gas appliances.
In addition to detecting main combustion and automatically operating the ventilation fan, a detector is installed to detect electricity to the ventilation fan, and when electricity is cut off, the gas supply to gas appliances is cut off, and when the ventilation fan does not rotate even when electricity is turned on, it starts rotating. The system attempts to improve safety by detecting this with a detector, cutting off the gas supply, and activating an alarm.

Conventionally, there have been devices that automatically operate ventilation fans using transformer relays, but there have been none that cut off the gas supply by detecting energization to the ventilation fan and detect rotation of the ventilation fan to cut off the gas supply.

The present invention aims to improve safety by shutting off the gas even when the ventilation fan is not energized or does not rotate even if energized when a bus appliance is in use.Examples of this invention will be described below with reference to the accompanying drawings.

In FIG. 1, 1 has a commercial power source, 2 has a primary coil 3, and a secondary coil 4 and a tertiary coil 5 which are lowered to a low voltage.By short-circuiting the secondary coil 4, the secondary coil 4 is A relay contact 6 constituted by a magnetic circuit is provided to open and close, and the tertiary coil 5 is a transformer relay configured to obtain a low voltage power source.

A ventilation fan 7 is connected via the relay contact 6.

The secondary coil 4 of the transformer relay 2 is connected in parallel with an element 8 for detecting non-combustion of a gas appliance (for example, a gas pressure responsive switch, a water pressure responsive switch, an exhaust heat responsive switch, etc.) and a manual switch 9.

Further, a DC power supply circuit consisting of a rectifying element 10 and a smoothing capacitor 11 is connected to the tertiary coil 5.

On the other hand, a detector 12 for detecting energization of the ventilation fan 7 is connected in parallel with the transformer relay 2, and a normally closed contact 13 of the detector 12 is connected in parallel with the transformer relay 2.
The DC voltage of the DC power supply circuit is transmitted through the load resistor 14 to the safety valve 17 of the safety device 15 consisting of the thermocouple 16 and the safety valve 17 of the gas appliance when the detector 12 is not in operation. It is connected so that the voltage applied to the safety valve 17 is applied in the opposite direction to the direction (+, one direction shown).

In addition, the ventilation fan 7 has a rotation detector 18 that detects the rotation of the ventilation fan (in the case of an electric ventilation fan, a switch that detects the opening/closing of the shutter part, and in the case of other ventilation fans, it detects the rotation speed of the blades,
Relay 19
Connect.

Then, the normally open contact 20 of this relay 19 is connected to the alarm 21.

Further, a normally closed contact 22 of the relay 19 is connected to the detector 12.

In the above configuration, by applying the commercial power supply 1, the detector 12 is energized and the contact 13 is turned off.

By igniting the pilot burner of the gas appliance, the thermocouple 16 is heated and the safety valve 17 is opened by its output.

Here, since the contact 13 is off, the output of the thermocouple 16 is applied only to the safety valve 17.

Next, when main combustion is started, the combustion detection element 8 is turned on, short-circuiting the secondary coil 4, which turns on the relay contact 6, and the ventilation fan 7 is automatically operated.

However, if the shutter of the ventilation fan 7 does not open completely, the blades do not rotate, the rotation speed of the blades is insufficient due to oil etc., or if you forget to turn on the ventilation fan switch, the rotation detector 18 will malfunction. When activated, the relay 19 is energized, so the normally open contact 20 is turned on and the alarm 21 is energized, causing an alarm to sound.

At the same time, the normally closed contact 22 is turned off, cutting off the power to the detector 12, the contact 13 of the detector 12 is turned on, a voltage is applied to the safety valve 17, and the safety valve 17 is disengaged, cutting off the gas. It is something.

In another embodiment shown in FIG. 2, a timer relay 19' is connected to the rotation detector 18, a normally open contact 20' is connected to an alarm 21, and a normally closed contact 22' is connected to the detector 12. By doing so, the gas is shut off and the alarm 21 is activated with a time delay to detect whether the ventilation fan 7 has completely rotated, without immediately shutting off the gas when the rotation detector 18 is inactive. This is what we are trying to do.

In addition, by providing a time delay to the normally open contact 20' and the normally closed contact 22', the alarm activation and gas shutoff functions can be configured such that the gas is shut off after a time delay after the alarm 21 is activated. By creating a time difference between
It also improves usability.

In addition, as a means for shutting off the safety valve 17, instead of applying the DC voltage in reverse as shown in FIGS. can be done.

As described above, according to the present invention, the following excellent effects can be expected.

■ The ventilation fan can be operated automatically in conjunction with the main combustion of open gas appliances.

II. When the power to the ventilation fan is cut off due to a power outage, etc., the gas supply to gas appliances can be cut off.

III Even if the ventilation fan is energized, the gas supply to the gas appliance can be cut off if the ventilation fan is forgotten to turn on, the rotation speed is insufficient, or the shutter does not open.

IV An alarm can be activated when the ventilation fan is not rotating, and when the alarm is noticed, it can be used as a countermeasure against forgetting to turn on the ventilation fan, and even if the ventilation fan is rotating, it can also issue an alarm when complete ventilation cannot be achieved due to insufficient rotation speed. can.

■ Instead of shutting off the gas at the same time as the alarm is activated, it is also possible to have a time delay.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing an embodiment of the present invention, and FIG. 2 is a circuit diagram showing another embodiment. 2... Transformer relay, 7... Ventilation fan, 8... Combustion detection element, 9... Manual switch, 10... Rectifier Motoko, 11...
...Capacitor, 12...Detector, 16...
...Thermocouple, 17... Safety valve, 18...
...Rotation detector, 19...Relay, 19'...
...Timer relay, 21...Alarm.

Claims (3)

[Scope of utility model registration request] (1) A relay contact that has a primary coil connected to a commercial power supply, a secondary coil and a tertiary coil that are stepped down to low voltage, and is configured by the magnetic circuit of the secondary coil by shorting the secondary coil. In addition to opening and closing, the tertiary coil is provided with a transformer relay configured to obtain a low voltage power supply, a ventilation fan is connected through the relay contact, and a combustion detection element of a gas appliance and a manual connection are connected to the secondary coil. A DC power supply circuit consisting of a rectifying element and a capacitor is connected to the tertiary coil, a rotation detector and a relay for detecting rotation of the ventilation fan are provided in parallel with the ventilation fan, and a rotation detector and a relay are installed in parallel with the primary coil of the transformer relay. A normally closed contact of the relay is connected to a detector that detects that the power to the ventilation fan is unexpectedly cut off, and a normally closed contact of the relay is connected to an alarm, and when the detector is inoperative, the gas appliance A ventilation fan interlocking device characterized in that the DC voltage of the DC power supply circuit is applied to a safety device comprising a thermocouple and a safety valve of a gas appliance so as to cut off the gas supply. (2) The ventilation fan interlocking device according to claim 1, wherein the ventilation fan interlocking device is characterized in that a rotation detector is used to confirm the opening/closing operation of the ventilation fan. (3) The ventilation fan interlocking device according to claim 1, wherein the relay connected to the rotation detector is configured as a timer.