Tungsten needle for honeycomb electric field fume purifier
Tungsten needle is a kind of tungsten products made of pure tungsten or tungsten alloy with slender structure. Because of its good mechanical, thermal and electrical properties, it is widely used in many fields, such as engraving metal surface, instrument probe and electrode material in argon arc welding technology, and used as the cathode of honeycomb electrostatic oil fume 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 honeycomb-like electric field made of a combination of tubes that look like a honeycomb.
The working principle of the honeycomb oil fume purifier is that when the oil fume passes through the honeycomb cylinder, it is discharged through the high-pressure tungsten tooth bar to ionize the oil fume particles, and then absorbed the ionized oil fume particles through the same charged honeycomb cylinder to achieve 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 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.
Tungsten needles are generally made of high quality tungsten alloy (W > 98%) or pure tungsten (W > 99.95%). Tungsten needle has become the preferred cathode material for honeycomb electric field lampblack purifier due to its excellent electric conductivity and thermal conductivity, high hardness, high strength, low impurity content, high tensile strength, good wear resistance, excellent ductility and no radioactivity.
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: the first solid powder and organic binder uniform mixing, after granulation in the state of heating plasticizing, injection molding machine into the mold cavity curing forming; Then the binder in the formed billet is removed by chemical or thermal decomposition, and finally the product can be obtained by sintering and densification. Drawing molding process: the metal raw material is heated to plastic, and then stretched to the desired diameter, and finally cooled by shearing.
