Centrifugal sprayer is a liquid sprayer broader application, it makes the liquid material supplied to the high-speed rotation of the turntable, due to centrifugal force, thrown into a thin film material solution, by spraying the edge of the disc while the air friction that is thrown as well as from the droplet surface tension itself.
1, the structure of centrifugal spray disk, surrounded nozzle vane grooves.
Many types of centrifugal spray disk. Common are gun-type and disc two categories. The choice depends on the type of sprayer is the nature of dry materials, such as low viscosity liquid material can be gun-type and multi-vane on the viscosity of the liquid material can be smooth disc, such as disc.
(1) wetted perimeter length, smooth surface;
(2) enables the solution to achieve high speed;
(3) spray evenly;
(4) centrifugal disc structure itself requires strong, light weight, simple structure, no dead ends, easily washable, there should be a greater production capacity.
Dish, bowl, mitral type surface smooth, longer wetting perimeter, the solution form a flat film, is conducive to atomization, also relatively simple structure; but the drawback is: smooth surface, compared with the solution generated in the tray large sliding, so they can not get a higher spray rate. In addition, the disc centrifugal disk in the feed, the prone droplets splash. Rivet bowl centrifugal disc shedding, dangerous.
In order to prevent each of the above-mentioned drawbacks, there are many improvements in the design, as it is designed to prevent the slide groove, leaf plate, and the like centrifugal disk type spray gun. Although the trench type centrifugal disk can guarantee the solution can reach centrifugal disk rotational speed, but the ejected solution presents a separate small stream, a thicker film, the atomization uniform. The dispersion of small droplets, finished coarse, if ejection hole piecemeal, in case of dirt clogging possible. In comparison to the trench gun centrifugal centrifugal disc, there has been improvement, but to improve the processing capacity, increase the number of guns before they make the film thinner, adjust inconvenient. Such equipment currently used for small and medium sized factories. Leaf plate centrifugal disk has good wetting perimeter, when the solution was centrifuged at the center of the disk closer to where the velocity is not. So little slide. In the center of the centrifugal disk distant places, appropriately increase the number of blades, it is possible and at the same rotational speed, increasing the wetted surface of the perimeter, the solution of the film along the vertical vane centrifugal disk move in the same size. Therefore, without changing the diameter of the centrifugal disk increases vane height to increase productivity, and can obtain the same degree of dispersion and spray spray Moment diameter. Visible leaf plate centrifugal disk structure is more reasonable. Its disadvantage is the need to consume more power circulating air.
Multilayer centrifugal disk: In the case of spray from a smaller diameter to obtain higher productivity; the little disc diameter, easy to get a higher speed; centrifugal multi-plate can be made of two or more materials Meanwhile liquid spray while mixing.
Centrifugal and diameter of the disk is typically 160-500mm, speed is about 3000-20000 rev / min until up to 20,000 or more. Corresponding disc circumferential speed of 75-170m / s. In order to achieve product uniformity, dispersion and the like of small spray torque requirement, in the design of centrifugal spray disc, the minimum peripheral speed of not less than 60m / s. As proved, if not small peripheral speed 60m / s, the resulting droplet is uneven, tiny droplets plate near and distant coarse droplets.