There are many types of nozzles, available for many options. Generally, the degreasing and washing step nozzles can choose the jet-type nozzle with strong impact force: Take "V" type that is the segment-type nozzle for example, the angle of injection is 60 ° and has a larger impact strength; phosphating process nozzle can use centrifugal nozzle with good atomization, fine uniform water tablets, weak impact: Take "Z" pattern cone nozzles for example, the optimum distance of the nozzle workpiece is 40cm ~ 50cm, which has dispersion, atomize the liquid spray function. The arrangement of spray gun nozzle on the spout can use parallel and cross two forms, channel type using a vertical cross arrangement, whose spray is better.
Factors affecting the selection of nozzles
The factors for the selection of nozzles include flow, pressure, spray angle, coverage, impact, temperature, materials, applications, and these factors often implicate and mutually restraint each other. Flow and pressure, spray angle and coverage are in proportional relationship. Any nozzle injection purpose is to continuously maintain the bath in contact with the workpiece, the flow factor is more important than the pressure. The temperature of the liquid does not affect the performance of the spray nozzle, but it affects the viscosity and specific gravity, and also influences the choice of materials. The nozzle material should be determined based on the chemical properties of the bath; non-corrosive bath can be cast in bronze or plastic die-casting according to the ease of processing. To prevent corrosion, non-metallic materials can be used; for sulfuric acid, hydrochloric acid strong etching bath, nylon plastic can be used; nozzle material used for phosphating commonly use acid-resistant stainless steel, rust resistant nozzle can use stainless steel or nylon to produce.
Examples of nozzle selection
The nozzle with a certain impact should use small-angle nozzle, plume flow (jet) is the best; fan spray nozzle is suitable for cleaning, degreasing, cooling; conical nozzle is suitable for bleaching cream, the surface layer, phosphide, humidification, dust, etc. Venturi mixing nozzle should be installed in the reservoir paint cylinder, tank, take the "H" type mixing nozzle (also known as venturi nozzle), for example, the bath mixing diffuse and eject with the sucked liquid at after mixing 1:4 at a certain pressure, achieve solute air mixing effect, thereby preventing the precipitation, because the agitation ensurse a uniform mixing of chemical solution.
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