Thermoelectric kitchen burning gas safety flame-out protection device composed of electromagnetic valve and the thermocouple

Thermoelectric kitchen burning gas safety flame-out protection device composed of electromagnetic valve and the thermocouple solenoid valve experts thermal is also called double metal plate. Bimetallic strip is composed of two different expansion coefficient of metal alloy, under the effect of temperature, the large expansion coefficient of metal side bending to the metal side of the small expansion coefficient, when the loss of temperature, the original has bent metal expansion and will gradually restore to its original state, so the bimetallic strip is also known as memory alloy. Bimetallic strip will be used for safety protection device of the sensor, exploits the bimetallic strip under the effect of temperature expansion characteristics of the bend. Bimetallic strip protection device has the advantage of simple structure, low cost. Defect is in installation, the installation position of bimetallic strip and plug valves and gas valves with high demands, and thermal inertia is big, open the valve and closing valve for a long time, short service life. The thermoelectric device is produced by the use of fuel gas combustion heat. Thermoelectric stall safety device composed of thermocouple and the electromagnetic valve, thermocouple is made up by two different alloy material. Different alloy material under the action of temperature will produce different thermoelectric potential, thermocouple is using different alloy material under the action of temperature of thermoelectric potential and different, it takes advantage of the electric difference of different alloy material. Thermoelectric safety protection device has simple structure, convenient installation, low cost, has been widely used at present. But such protection device with thermocouple as a thermal sensor, the disadvantage is that large thermal inertia, slow reaction, make the person feels inconvenient operation, and short service life of plug valve and solenoid valve with high installation accuracy requirements. Photoelectric induction also called ions. When the device is the use of gas in the combustion flame with ion and one-way conductive characteristics. This way of safety protection was first applied in gas water heaters, and has set up a dc induced by early development to the present ac induction, the reliability has been greatly improved, the application in the kitchen was only three or four years old. In addition to the kitchen burning gas ignition tests require continuous point time at least one time point ignition point to; But the poor quality of enterprises to adopt the igniter, point consecutive may burn only five or six times, if so, due to the fire didn't point, gas will leak out, much leakage, explosion occurs when lit again, to hurt people. Some bad enterprises adopting faulty goods igniter, the reason is due to cost considerations, RMB to a good ignition cost, quality, and the difference of igniter as one yuan.