First, the nozzle type
Fan-shaped, cone-shaped, liquid column flow (i.e. jet), air atomization and flat nozzle, in which cone-shaped nozzle is divided into hollow cone and solid cone; Names of Venturi nozzle (mixing and stirring nozzle), strong cold (hot) tuyere blowing nozzle and special nozzles (such as garden nozzle, cylinder washing nozzle, pipeline cleaning nozzle, etc.). ) reflect the running performance of the nozzle.
Second, the selection skills
1, there are many kinds of nozzles and a wide range of choices.
2. Generally speaking, the nozzle in degreasing and water washing can be a jet nozzle with strong impact force: take the V-shaped fan nozzle as an example, its jet angle is 60, which has a strong impact force.
3. In the phosphating process, the nozzle can be a centrifugal nozzle with good atomization, fine and uniform water particles and weak impact force. Taking the Z-shaped conical nozzle as an example, the optimal distance between the nozzle and the workpiece is 40 cm ~ 50 cm, which has the spraying function of dispersing and atomizing liquid. The nozzle arrangement on the nozzle can have two forms: parallel and cross. For the channel type, the spraying effect is better by adopting vertical cross arrangement.
4. The factors of nozzle selection include flow rate, pressure, spray angle, coverage, impact force, temperature, material and application. And these factors are often interrelated and mutually restrictive.
Third, matters needing attention
1, the flow rate is proportional to the pressure, and the spray angle is proportional to the coverage rate. The purpose of any nozzle is to keep the bath liquid in continuous contact with the workpiece, and the flow rate is more important than the pressure.
2. The temperature of the liquid does not affect the spray performance of the nozzle, but affects the viscosity and specific gravity, and also affects the selection of materials. The material of the nozzle should also be determined according to the chemical characteristics of the plating solution. For non-corrosive bath, bronze casting or plastic die casting can be used according to the difficulty of processing.
3. In order to prevent corrosion, nonmetallic materials can be used; For highly corrosive bath solutions such as sulfuric acid and hydrochloric acid, nylon plastic can be used; The nozzle material of phosphating bath solution is generally acid-resistant stainless steel, and the anti-corrosion nozzle can also be directly made of stainless steel or nylon.
The above is how to choose the nozzle. Choosing nozzles is tricky because there are thousands of nozzles for different purposes. When we choose the nozzle, we should choose it according to the actual use. The material and quality of the nozzle are also important. When choosing a nozzle, you must choose some high-quality water spray, and it is best to choose a nozzle that is not easy to rust. It is best to choose some nozzles made of all copper or stainless steel.