The Manufacturer Introduces The Thermocouple Extinguishing Device For Gas Stoves
When it comes to gas stoves, everyone is familiar with them. Nowadays, stoves have become a must-have cooking appliance in every home kitchen. The component device I want to talk about below is a safety gas shutoff protection device that must be equipped on the stove in daily household kitchens. According to the national standard requirements of "Household Gas Cookers GB16410-2007" officially issued by the National Standards Committee, the regulations have been implemented and implemented since May 1, 2008. Every stove manufacturer is required to install automatic flameout protection devices on products produced and sold in the domestic market. So, what does the automatic stove flameout protection device look like? what's the effect? How does it work?
Gas stove burnout - information on thermocouple induction devices.
The thermocouple induction flameout device consists of three parts: an electromagnetic valve, an induction needle, and a connecting wire.
The combination of the thermocouple induction device and the stove valve body (assembly) forms a high temperature generated by the stove flame, which is picked up by the induction needle and generates an electromotive force that is transmitted to the solenoid valve, causing it to generate magnetic force to attract the iron plate to drive the gas. The sealing ring of the internal circulation channel completes the function of opening the gas valve channel. The working principle of the electromagnetic self-priming valve is: the induction needle position is point A, and the solenoid valve point B of the valve body (assembly). When the two are connected, points A and B are used when the stove is not on fire. , the temperature difference between the two points is the same. When the stove burner is on fire and the temperature of the induction needle (point A) rises and there is a temperature difference compared with point B, a certain electromotive force will be generated between AB and A, thus forming a circuit in the circuit that can drive the solenoid valve coil to generate magnetic force. Electric current, this phenomenon is called the thermoelectric effect. When the solenoid valve has magnetism, it will attract the iron piece with the black air-blocking gasket. When there is no flame on the stove head, the temperature difference between points A and B is lost, and the electromotive force is lost. The iron sheet with the black gas-blocking gasket will be pressed back to its original position by the spring, causing the gas channel to be blocked. The gas cannot flow through the channel normally and flows out of the burner head, thus blocking it. The gas will continue to flow out due to normal combustion in the future. The thermocouple of the stove uses this thermoelectric effect to work to achieve automatic gas shutoff protection when the stove is turned off.
The conductivity of the thermocouple material will directly affect its stability, reliability and the after-sales rate of the entire stove. Thermocouples made of high-quality materials can ensure reliable and stable operation of the thermocouple. High-quality stove thermocouple flameout materials need to have the following characteristics:
① The two points of thermocouple AB must be reliably connected, and the joint and connecting wire must be welded firmly;
② The connecting wires forming a loop between the two hot electrodes AB must be insulated to prevent short circuit;
③ The electromagnetic force generated by the solenoid valve coil must be greater than the pressure of the spring, and the spring is not easy to deform or relax for a long time;
④ The sensing pin and welding position should be equipped with protective sleeves to ensure sufficient isolation and insulation between the hot electrode and harmful media.
The basic requirements of ordinary stove manufacturers for the accessories of qualified flameout devices are:
(1) The AB point of the stove thermocouple is within the temperature measurement range. The temperature rise of the contact flame changes steadily, the response is rapid, the electromotive force generated is stable and continuous, does not change with time, and has sufficient physical and chemical stability, sensing material and conduction The material does not deform at high temperatures and is not easily oxidized or corroded;
(2) The material used has a small temperature coefficient of resistance, sensitive conduction and temperature sensing, high conductivity, and small specific heat;
(3) The thermal electromotive force generated at two points AB during temperature measurement must be large enough, and the relationship between the thermal electromotive force and temperature is a linear or nearly linear single-value function. Therefore, the flameout sensing needle is mostly made of copper with sensitive thermal conductivity sensing properties. Metal Material;
(4) Due to the large demand for stoves, flameout accessories are required to be made of materials that are reproducible, easy to produce and process, have high overall mechanical strength, and are suitable for ordinary households.
Gas stove flameout protection - thermocouple induction device is a safety device with a high usage rate among stoves in the kitchen appliance market. It is also a more affordable one with a low failure rate.
In order to save costs, some stove manufacturers use iron accessories or thermocouple induction devices with substandard performance. If the user later purchases a stove with this type of product and does not use it for a long time, the gas may be interrupted during use, or the stove may not be able to start a fire. How to use the stove! When ordinary consumers purchase stoves, they must choose products from regular stove manufacturer brands. At the same time, pay attention to check whether the stove head has a safety automatic shut-off copper sensor pin to ensure that it is a safe stove with a shut-off guarantee.
