Tungsten needle for fume purifier in honeycomb electric field
Tungsten needle is a kind of slender structure made of pure tungsten or tungsten alloy tungsten products. Because of its good mechanical, thermal and electrical properties, it is widely used in many fields, such as for carving metal surface, instrument probe and electrode material in argon arc welding technology, as well as as the cathode of honeycomb electrostatic lampblack purifier.
The most commonly used kitchen lampblack purifier is electrostatic lampblack purifier, according to the different structure, it can be divided into honeycomb and flat static. A cellular purifier is a honeycombed electric field, made up of a tube that looks like a honeycomb.
The working principle of the honeycomb lampblack purifier is that when the lampblack passes through the honeycomb cylinder, the lampblack particles are ionized through the high pressure tungsten tooth rod discharge, and then the ionized lampblack particles are absorbed through the same charged honeycomb cylinder to achieve the purification effect.
For honeycomb electric field, the key is that tungsten tooth is placed in the middle of the cylinder rods of the center of a circle cylinder must be in place and not deformation of partial needle, needle in the event of partial not round or cylinder deformation, the tungsten toothed bar will proximally with high voltage discharge, it will cause the cylinder failure, serious will cause accumulation on the cylinder oil dirt is on fire, fire. Therefore, it is necessary to regularly check whether there is a deviation needle in the cylinder body and whether there is deformation in the cylinder body wall. Once there is deformation, it is necessary to correct it in time.
The tungsten needle is generally made of high quality tungsten alloy (W > 98%) or pure tungsten (W > 99.95%).Due to its excellent electrical and thermal conductivity, high hardness, high strength, low impurity content, high tensile strength, good wear resistance, excellent ductility and no radioactivity, tungsten needle has become the preferred material for the cathode of honeycomb electric field lampblack purifier.
Tungsten needle mainly has two kinds of production process: one is metal injection molding process, the other is wire drawing molding process. Metal injection molding process: first the solid powder and organic binder uniform mixing, after granulation in the heating plasticizing state, with injection molding machine injection mold cavity solidification forming; Then the binder in the formed billet is removed by chemical or thermal decomposition, and finally the product is obtained by sintering and densification. Wire drawing molding process: metal raw materials are heated to plastic, then stretched to the desired diameter, and finally after shear cooling can be.
