Flue-cured tobacco igniter: principle of silicon nitride igniter

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Flue-cured tobacco igniter: The principle of silicon nitride igniter

In fact, the principle of a silicon nitride igniter is very similar to the principle of flint on a lighter. Connected to the plug is the knob of the gas stove. When we press the knob, the plug will collide with the convex part of the ignition hammer. When we turn the knob to the left, the plunger of the silicon nitride igniter will move to the left together and hit the convex part of the ignition hammer. As the rotation angle increases, the ignition hammer is separated from the insert, and the piezoelectric element is quickly hit by the spring.

Flue-cured tobacco igniter: The principle of silicon nitride igniter

Many friends do not know what a piezoelectric element is. Piezoelectric element is a special kind of ceramic dielectric. Whether the two ends are pressed or stretched at the same time, it will affect its development. Some of the same charges are generated between the two ends, and various charges are generated in the middle, which can carry a large amount of charge instantly. If the ignition hammer hits instantly, a high voltage of 5000V to 10000 V will be generated, and the high voltage will be transmitted to the ignition needle through the wire. The silicon nitride igniter discharges the ignition gas in ionized air.

The ignition temperature of the silicon nitride igniter is one of the advanced new ignition devices, and the ignition is heated by a heating element. Some products use silicon nitride plus foam composite silicon nitrided or buried in hot wires with sintered heating elements. Ceramic blocks are used to install high-purity alumina ceramics with very high density and mechanical strength. Products supported by the power supply have a greater impact on the current ignition temperature within a few seconds. Work, humidity and other electromagnetic fields have an impact on the environment, but there is no electromagnetic interference to the external environment. Fire safety and reliability, long service life. It can ignite various flammable gases, liquids, solids and other materials. Household gas stoves are widely used in microwave ovens, ovens, water heaters, dryers, thermostats, heaters, gas air conditioners and other equipment.

Flue-cured tobacco igniter: Characteristics of Silicon Nitride Igniters

Silicon nitride igniter is an important high-temperature structural ceramic, which has the characteristics of low thermal expansion coefficient, high hardness, high elastic modulus, good thermal performance, chemical stability and edge. In addition, it also has the advantages of oxidation resistance and corrosion resistance, and has broad application prospects. Pure silicon nitride does not absorb microwave energy at room temperature, is almost microwave transparent, and relies on its own dielectric loss for heating.

The special ceramic heater for silicon nitride was studied, and a new type of silicon nitride ceramic heater was prepared by improving the formula, process selection and sintering process.

Silicon nitride igniter has the advantages of small size, light weight and high power density.

2. By improving the molding and sintering process, silicon nitride ceramic heaters with complex shapes such as cylinders with arbitrary temperature distribution can be prepared. Compared with traditional ceramic heaters, it has higher thermal efficiency and thermal shock resistance, which greatly extends the service life of the product.

3. Good heat dissipation performance. The heating efficiency is above 98%, and the high temperature can reach 800-1000 in a few seconds. Can be directly heated water, gas, kerosene, metal and other media, no noise, no pollution.

4. Silicon nitride igniter has high reliability.