Types and working methods of sprayers

Update:17-05-2019
Summary:

1. Cone mold head The conical mist nozzle uses the cent […]

1. Cone mold head
The conical mist nozzle uses the centrifugal force of the liquid vortex to atomize the liquid. It is the most widely used nozzle on the sprayer. The specific process varies from structure to structure, but the basic principle is to rotate the liquid in the nozzle around the axis of the hole. After the liquid medicine is ejected, the centripetal force given by the solid wall does not exist. At this time, the liquid particles are subjected to the centrifugal force of rotation, and are scattered along the straight line, and these straight lines are tangent to its original motion trajectory, that is, with a conical surface. The cone of the conical surface is placed on the axis of the orifice, so that a hollow cone is ejected, and the centrifugal force of the vortex is used to atomize the liquid. According to the type of nozzle, it is divided into:
(1) Tangential inlet nozzle
It consists of a nozzle cap, a orifice plate and a nozzle body (3-10). In addition to the connecting threads at both ends, the nozzle body has a cone core, a water swirling chamber and an inlet inclined hole. There is an injection hole in the center of the orifice sheet, and the nozzle sheet is fixed on the nozzle body by the nozzle cap. The atomization principle is: when the high-pressure chemical liquid enters the tangential inlet pipe hole of the nozzle, the liquid medicine rotates around the cone core at a high speed to make a high-speed rotary motion. Since the inclined hole is tangent to the cylindrical surface of the vortex chamber and has an oblique angle with the circumferential surface bus bar, the liquid flow is a spiral type rotary motion, that is, the liquid medicine moves on the one hand and moves toward the injection hole. Due to the combined action of the centrifugal force generated by the rotary motion and the pressure difference between the inside and outside of the nozzle hole, the liquid medicine is sprayed through the nozzle hole and then scattered to the periphery to form a rotary liquid flow film hollow cone, that is, a hollow cone mist. The farther away from the nozzle hole, the thinner the liquid film is torn, ruptured into a filament shape, colliding with relatively static air, and forming fine droplets under the action of liquid surface tension. The droplets are collided and deposited under the action of inertial force. On the crops.
The characteristics of this type of nozzle are: as the pressure increases, the amount of spray increases, the spray angle also increases, and the finer the droplets. However, this phenomenon is not significant after the pressure is increased to a certain value. Conversely, when the pressure is reduced, the situation is just the opposite. When the pressure drops to a certain value, the nozzle does not function as a atomizer.
When the pressure is constant, the diameter of the nozzle hole is increased, the spray amount can be increased, and the fog cone angle is increased, but when the diameter of the nozzle hole is increased to a certain value, the increase of the fog cone angle is not obvious. At this time, the droplets will become thicker and the range will increase. Conversely, the reduction of the diameter of the orifices can reduce the amount of spray, reduce the angle of the mist cone, reduce the droplets, and shorten the range.
(2) Rotary water core nozzle
It consists of a nozzle body, a water-jet core and a nozzle cap (3-11). There is a spray hole on the nozzle cap, and the spiral water core has a spiral groove with a rectangular cross section, and the end portion has a certain gap with the nozzle cap, which is called a vortex chamber.
The atomization principle is the same as described above, that is, the formation of the droplets is a process in which the discharged liquid film first breaks into a filament shape and further breaks into a droplet. When the high-pressure liquid enters the nozzle and passes through the vortex core with a rectangular spiral groove, it rotates at a high speed, and after entering the vortex chamber, it moves along the direction of the spiral groove. Under the action of centrifugal force, the liquid medicine is ejected from the injection hole at a high speed, and is atomized into a hollow conical mist by colliding with relatively static air.
Due to the difference in pressure and orifice diameter, the thickness of the droplets formed, the range of the range, and the size of the cone angle are also different. The others are the same as the tangential inlet nozzles. When the depth of the vortex chamber is adjusted to make it deeper, the droplets become thicker, the fog cone angle becomes smaller, and the range becomes longer.

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