Ignition method
Nowadays, the popular ignition methods of gas stoves are electronic pulse ignition and piezoelectric ceramic ignition. Electricity
Sub-pulse ignition consumers are generally familiar with this type of ignition device, which is mostly used in embedded stoves. When it is twisted to a certain position, it is on fire. It is very simple and convenient, and the ignition hit rate is high, generally 100%, but this method needs Change the battery.
Piezoelectric ceramic ignition is mostly used for desktop stoves, and the biggest advantage is that no battery is needed. However, the success rate of ignition is related to the ambient humidity, and it is not easy to point when the humidity is large. In addition, when the ignition is required, the switch needs to be held down to catch the fire, and there is no electronic pulse ignition as fast.
Flameout method
For safety reasons, the flameout protection device of the gas stove is very necessary, and the relevant national standards also have mandatory regulations. There are currently three types of flameout protection methods commonly used on the market: thermal, thermoelectric and photoelectric.
Thermal type: also known as bimetal. The bimetal is made of two metals with different expansion coefficients. Under the action of temperature, the metal side with a large expansion coefficient will bend toward the metal side with a small expansion coefficient. When the temperature is lost, the originally expanded metal is expanded. It will slowly return to its original state, so the bimetal is also called the memory alloy. The sensor that uses the bimetal as a safety protection device utilizes the characteristic that the bimetal is expanded and bent under the action of temperature.
The advantage of the bimetal protection device is that the structure is simple and the cost is low. The disadvantage is that the installation is difficult, the installation position of the bimetal and the cooperation of the plug valve and the gas valve have high requirements, and the heat inertia is large, the valve opening and closing time is long, and the service life is short.
Thermoelectric type: This device also utilizes the heat generated when the gas is burned. The thermoelectric flameout safety protection device is composed of two parts: a thermocouple and a solenoid valve. The thermocouple is composed of two different alloy materials. Different alloy materials produce different thermoelectric potentials under the action of temperature. Thermocouples are manufactured by using different thermoelectric potentials of different alloy materials under the action of temperature, which utilizes the electrothermal difference of different alloy materials.
The thermoelectric safety protection device has a simple structure, convenient installation and low cost, and has been widely used at present. However, such a protection device uses a thermocouple as a thermal sensor. The disadvantage is that the thermal inertia is large and the reaction speed is slow, which makes the user feel inconvenient to operate, and has a short service life. The installation accuracy of the plug valve and the solenoid valve is relatively high.
Photoelectric: also known as ion sensing. The device utilizes gas to burn ions while burning and has unidirectional conductive properties. This kind of safety protection method was first applied to gas water heaters, and has been developed from the early DC induction to the current AC induction, which has greatly improved the reliability. It has only been used for three or four years on the stove.
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