| 摘要 |
Unlike directly controlling a valve of the gas conduit in the conventional gas heating device, a valve rod 3 which is connecting to a diaphragm valve 1 merely actuates a microswitch 4 for electric control board 11. A first gas conduit and a second gas conduit which communicate separately with the nozzle 14 of a pilot burner and the nozzles of a main burner 18, are controlled respectively by a first solenoid operated valve 5 and a second solenoid operated valve 6. In the vicinity of the nozzle 14 of the pilot burner, a sensor 16 is provided for detecting the presence of the flame 15 of the pilot burner. As the flame 15 of the pilot burner is ignited by the igniter 12, the sensor 16 will send a first electric signal to the electric control board 11 to discontinue the sparkling of the igniter 12, and to open the second solenoid operated valve 6 and supply the gas to the main burner 18. As the flame is undesirably blown out during the use of gas heating device, the sensor 16 will send a second electric signal to the electric control board 11 to continue the sparkling of the igniter 12, and to actuate the second solenoid operated valve 6 and stop the gas supply to the main burner 18 so as to prevent the unburned toxic gas from flowing out of the nozzle thereof. <IMAGE> |
