Do You Know How The Sprayer Works? Generally Divided Into Four Types!

There are four principles of sprayer spraying:

The first one uses Bernoulli's principle.

Bernoulli's principle says that in the same fluid, the flow rate is large, but the pressure is small; the flow rate is small, and the pressure is strong. The fluid will automatically flow from high pressure to low pressure. When passing through the three-pronged pipe, the low-speed flowing water flows to the high-speed flowing air. The water is torn into droplets by high-speed air (Imagine that the water flowing out of the faucet has a slow speed at first, which is a column of water; but then the speed gradually increases and then becomes drop by drop). These small water droplets become fog when they are sprayed out.

The second method uses the principle of pressing water into a thin tube to cause high-speed water flow, and the high-speed water flow breaks into small water droplets when it hits an obstacle.

The situation is like opening the faucet and blocking it with your fingers. Household sprayers use this structure because of the low cost.

The third is to charge water (water is a dielectric) and use the same kind of charge to repel each other to divide the water into droplets.

The droplets of this method are very small. The same principle is used to paint cars.

The fourth is the principle of ultrasonic atomization.

Vibration can cause "sprays" on the water surface. The vibration frequency of ultrasonic waves is very high, so the wavelength of its "waves" is very small, so its "sprays"—small water droplets are also very small, and these small water droplets become fog.

Backpack:

1. Working principle

    When the operator pushes the rocker or handles up and down, the plug rod reciprocates up and down in the pump barrel through the connecting rod, with a stroke of 40-100 mm. When the stopper rod moves up, the cup moves from bottom to top, and the volume of the cavity formed by the cup and the pump barrel under the cup continues to increase, forming a partial vacuum. At this time, the liquid medicine in the liquid medicine barrel rushes through the water inlet valve under the action of the pressure difference between the liquid surface and the cavity and enters the pump barrel along the water inlet pipe to complete the water absorption process. When the stopper rod descends, the cup moves from top to bottom, and the liquid medicine in the pump barrel is squeezed, causing the pressure of the liquid medicine to increase suddenly. Under the action of this pressure, the inlet valve is closed, the outlet valve is pressed open, and the liquid medicine enters the air chamber through the outlet valve. The air in the air chamber is compressed to produce pressure on the liquid medicine. After the switch is turned on, the liquid medicine enters the nozzle through the spray rod and is atomized and sprayed out. In hollow cone spray nozzles, including tangential liquid inlet nozzles or nozzles with swirling water cores, the liquid enters the vortex chamber from the tangential liquid inlet channels or from the spiral channels of the swirling blades and the swirling water core. When rotating, the nozzle hole is on the axis of the vortex chamber, so the sprayed liquid forms a hollow conical film, which is then crushed into droplets. As for the sprinkler head with a double-groove water swirl core, the liquid passes through the water core from the axial inlet channel on the water swirl core, and then enters the vortex chamber tangentially composed of the pit in the front center of the water swirl core and the nozzle sheet. The nozzle of the slit nozzle has a cylindrical flow end in a hemispherical shape, and there is a V-shaped notch on the outside. The two liquid streams ejected from the arc surfaces on both sides of the V-shaped groove collide with each other to produce liquid in the direction of the groove. Membrane, liquid film and static air media act to form fan-shaped mist flow.

    Two, use and maintenance

    In addition to the use and maintenance of the knapsack sprayer in strict accordance with the requirements of the product instruction manual, the following points should also be paid attention to.

    ① The new cowhide bowl on the Gongnong-16 sprayer should be immersed in motor oil or animal oil (vegetable oil is not allowed) for 24 hours before installation. When installing the plug rod assembly into the pump barrel, pay attention to placing one side of the cowhide bowl in the pump barrel obliquely, and then rotate it to make the plug rod vertical, and use the other hand to help press the edge of the cup into the pump barrel. It can be loaded smoothly, avoiding forcibly stuffing.

    ② Choose suitable spray rods and nozzles according to needs. The NS-15 sprayer has several types of spray bars. The double nozzle T-shaped spray bar and the four-nozzle direct spray bar are suitable for wide-area spraying. The U-shaped double nozzle spray bar can be used for spraying on the crop line. Suitable for spraying on both sides of the crop base between rows. Hollow cone mist nozzles have nozzle pieces with several apertures. Large holes have a large flow rate. The fog spray bar is suitable for wide-spreading and all-round spraying, the U-shaped double nozzle spray bar can be used for spraying on the crop row, and the side double spray nozzle spray bar is suitable for spraying on both sides of the crop base between rows. Hollow cone mist nozzles have nozzle pieces with several apertures. Large holes have a large flow rate. The droplets are thicker and the spray angle is larger; the opposite of the small holes, the flow is small, the droplets are finer, and the spray angle is small. It can be selected appropriately according to the requirements of the spraying operation and the size of the crop.

    ③ When installing a 110° slit nozzle on the T-shaped direct spray rod of the NS-15 sprayer, the notch on the nozzle should be slightly deflected to form an angle of about 5° with the axis of the nozzle, so as to make the mist flow of the adjacent nozzles. Do not collide with each other. Pay attention to the height of the spray rods during operation, so that the mist flows of each nozzle overlap each other, and the amount of mist is evenly distributed in the entire spray range, which is suitable for full spraying of herbicides.

    ④ When carrying the work, press the joystick 18-25 times per minute. When operating Gongnong-16 and Changjiang-10 sprayers, do not bend too much to prevent the liquid from spilling onto the body from the lid.

    ⑤ Fill the liquid medicine, not to exceed the water level shown on the wall of the barrel. If you fill too much, there will be leakage at the cover of the pump barrel during work. When the liquid medicine in the air chamber exceeds the safe water level, stop pumping immediately to prevent the air chamber from exploding.

    ⑥ All leather gaskets should be soaked in engine oil during storage to avoid shrinkage and hardening.

    ⑦ At the end of daily use, a little water should be sprayed, and all parts of the sprayer should be cleaned, and then placed in a ventilated and dry indoor place.

    ⑧ After spraying the herbicide, the sprayer, including the chemical tank, hose, spray rod, nozzle, etc. must be thoroughly cleaned, so as not to cause phytotoxicity to the crops when spraying other pesticides next time.