Knowledge on Industrial Spray Nozzle Rapid

Application & Classification of Spray Nozzle

Although nozzle applications are various in all kinds of industries, but generally, common industrial nozzle applications can be divided into the following four categories: First: Nozzle for cleaning, washing and rinsing: including descaling process and product during hot rolled pressure, the high-pressure and middle pressure cleaning of automotive and equipment. And it also includes the low-pressure flushing and rinsing. Second: Coating nozzle: Spray coating applications include spray rust inhibitor, a plastic coating, release agent, lubricant, protective film and a wetting and conservation etc. Third: Cooling nozzle: In such applications, a spray nozzle is used for cooling the solid object, such as continuous casting slab cooling, roll cooling, and processing apparatus of the fitting, the cooling of the tank, as well as circulating water cooling or the like. Fourth: Special applications, including dust control, air and flue gas spray, spray drying, granulation, spray humidification, etc., such nozzle is mostly fan spray nozzle.



Material of Industrial Nozzles

Nozzles used in the iron and steel industry are mostly spray gun nozzle, they are made of copper or stainless steel; in some industry, the spray nozzle made by special materials are applied to the industries such as flue gas desulfurization and sulfuric acid recovery. In general, the high hardness material has better wear resistance. The performance of the continuous casting nozzle and nozzle arrangement with cooling control and nozzle maintenance, caster secondary cooling system, which is one of the largest casting machine pull speed, the role of rate and slab level of variety and quality of the decisive factors. The secondary cooling system is likened to a force, then the cooling control is to do battle command system; the nozzle layout is the strategic plan, and the nozzle is just like soldiers. In an army team, command and deployment is very important, if soldiers are not good at tactics, then it is difficult to win the war.

Problem Prevention and Resolution of Spray Nozzle

In any application of nozzles, the first step and the most important step is to choose the right spray nozzle. Second, a very important step is to establish a set of nozzle maintenance program to detect nozzle performance, application parameters such requirements will be able to maintain well. Each application has its specific requirements, the performance parameters of the nozzle also has the required order. In some spray application, for example, the nozzle has only one purpose. This objective requires only the injector to inject a certain amount of the liquid to the tank; while in some applications, it must ensure that the flow rate of the nozzle is precisely maintained at a certain level. The application of factors to be considered: (First) flow - each nozzle; (Second) spray pressure - in a sprinkler pipe; (Third) spray shape - each nozzle; (Fourth) product quality - provided by the quality control department; (Fifth) the use of effects - dust control, spray drying, flue gas cooling, water cooling, and spray humidification.

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How to Detect the Nozzle Failure?

Nozzle problems can be monitored

The function of nozzle problems is minor initially, so are often ignored. With the change of the throat, the change of spray characteristics is gradually obvious, and can be monitored.

Particle size: With flat fan nozzle wear or corrosion, the flow increases, the pressure drops, resulting in larger spray particles. This problem usually cannot be found out, but can be analyzed through the application of the results.

The nozzle alignment: when a nozzle is installed with multiple fan nozzles, it requires a complete uniform coverage, requires that all nozzles can accurately position, that is, all the fan-shaped spray pattern can accurately align, to ensure accurate coverage area. All spray must be mutually parallel, and form a 5 °- 10 ° corner with the nozzle. Otherwise, the entire coverage will be uneven.



Flow: When using centrifugal pump, the throat constantly wears, the nozzle flow usually increases under certain pressure. Because the increase in the flow is not easy to conceive, it is recommended to carry out regular flow detection. The flow detection can be read by detecting the flow meter, or using the collection method at a given pressure to collect water quantity within a certain time for measurement.

Spray shape: when fan spray nozzle throat is damaged, blocked or bond, the non-uniformity of the spray pattern changes is very easy to be found. And when the throat gradually wears, the spray shape of the change is not easy to be conceived, which can be found until the flow rate is increased substantially. For the applications require a very uniform spray coverage, it requires using special equipment or test to detect the uniformity of the spray pattern.

The spray shape of fan nozzle with elliptical throat is thick fan or tapered edge blade-shaped, and thus the overlap distribution of adjacent nozzles is very satisfactory. Angle contained in the spray pattern will be able to be found to reduce when the throat wears. You will find more water flow in the center, so that the water distribution increases. You can also find it is strip, hollow in the spray shape.

Hollow cone nozzle - basically a liquid ring, the uneven spray pattern is mainly performance the form of bars in certain areas. Solid cone, square, or oval-shaped spray nozzles, the spray shape unevenness is the same with the fan nozzle to some extent, and more water will be concentrated in the center. The spray pattern changes caused by the clogging of the solid inside the nozzle blades are not regular.

www.spray-nozzle.net is a high tech company which combined R&D, sales and production together. We have become one of the biggest manufacturers of spray nozzle in China after a development of more than 11 years.

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How to Choose the Nozzles?

Selection of different types of nozzles

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.

www.spray-nozzle.net is a high tech company which combined R&D, sales and production together. We have become one of the biggest manufacturers of spray nozzle in China after a development of more than 11 years.

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Nozzle Maintenance before Painting Process

The Reason of the Nozzle Failure

Firstly, erosion: when the high velocity of the liquid goes through the metal surface of the nozzle holes, it will cause the erosion of the nozzle hole resulting in the reduction of the spray gun nozzle, pressure and disorder of the spray state. Probability of erosion depends on the hardness of the liquid, spray pressure, the kinds and amounts of chemical materials. Furthermore, the particulate impurities in the liquid may also cause the punished erosion of the nozzle. Secondly, accidental damage: incorrect use and untimely maintenance are the main reasons for the nozzle accidental damage. Although the nozzle opening is typically designed into saucer shape, the offset of the fan nozzle structure is easy to be damaged. Thirdly, corrosion: when spray and wash the workpiece with chemical materials, these chemical materials can also cause corrosion of the nozzle material. Fourthly, obstruction: chemical materials and impurities are piped in internal or external edge of the nozzle resulting in clogging of the nozzle. This will affect the shape of the fan spray nozzle, which affects the spray pressure. Fifthly, temperature: nozzle has worked for a long time under high or abnormal temperature causing the damage of nozzle due to the softening of material.

Identification of the Nozzle

When the spray pump is running at its rated capacity, the spray pressure of the nozzle will be reduced with the expansion of the nozzle aperture. For the damaged nozzle, even if the nozzle is more than 30% of its rated flow, the change in the state of atomization is also difficult to be recognized by eyes. The best method to identify the nozzle is to observe the change of pressure in the sprinkler pipe. When comparing the different nozzles in the same pre-treatment system, the location and accuracy of the pressure gauge is essential. Usually pressure gauge should be placed in the front end of the spray tube. When judge of the pressure variation of the spray conduit, we should take intact nozzles spray pressure as a reference, and discriminate the problems of nozzle by the difference between the actual pressure and the reference pressure.

Exclusion of Nozzle Problem

Because it is difficult to directly observe the problems of nozzle, so we must pay attention to the selection of the nozzle. Select the appropriate nozzle, and also make a complete set of maintenance and replacement program. Regularly check the nozzle: including regular cleaning nozzle and regularly check the nozzle appearance damage. A few processes (such as pre-skimmed, skimmed) should be carried out in the general pre-processing production. The regular replacement of nozzle: frequency of nozzle replacement depends on the environment, the composition of the spray liquid and nozzle material. If the temperature is higher, or the spray liquid contains impurities, the number of nozzle replacement is relatively frequent.

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Fan Spray Nozzle in Our Daily Life

Appreciable Effects of Fan Spray Nozzle

The fan spray nozzles usually produce a line of spray. The spray angle of the plastic nozzles would decide how long this line is at a given distance from the orifice. Some flat fan spray nozzle usually produces numerous coarse sprays which contain larger droplets while some other designs would deliver fans of finely atomized sprays. Just like other sprays, the effects of a flat fan spray nozzle would be greatly decided by the flow rate and the pressure. Compared with other patterns of sprays, it generates numerous medium impact sprays.

Design Features of Fan Spray Nozzle

This design of the plastic nozzles and the fan spray nozzle impinges and also the spray onto a shaped deflection surface. The surface is so that the deflected spray can be formed right into a fan. This design features the benefit that the fan could be shaped into an extremely hard driving narrow fan appropriate for efficient cleaning or could be spread very widely to achieve optimum coverage. In addition, as the first spray orifice is circular instead of elliptical deflector, nozzles are more clog resistant and hence applicable in the dirty environments or used for spraying more lumpy fluids. Another advantage of deflection nozzles is that they could successfully deal with such situation when the space is constrained. Since the fan is designed at an angle to fill the pipe, instead of concurrent with, it actually can go through a relatively long distance towards the below target. Based on the angle of deflection (different in the spray angle), this can offer the flat fan much longer distance to "spread out". For instance, a deflection nozzle can deflect its spray by 45 degrees and can travel 1.4 times the distance before it hits the surface below.

Applications of Fan Spray Nozzle

The flat fan spray nozzle and the plastic nozzles are widely applied, such as applications in series mounted on the spray bars in the conveyor systems. The movement of the conveyor makes the product travelling below to obtain equal amount of the spray. Changing the speed of the conveyor would successfully control the degree of the spray. Due to above mentioned reasons, the fan spray nozzle can be widely applied in coating, washing as well as lubricating in various industries and during numerous production processes. Just like the flat fan spray nozzle products, you may also find wide range of products of various flow rates, spray angles as well as design styles in the market.

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