What is the principle of water discharge and atomization of perfume spray pump?

1. The principle of water outlet
Exhaust process:
Assume that there is no liquid in the base working chamber in the initial state. Press the pressing head, the compression rod drives the piston, the piston pushes the piston seat down, the spring is compressed, the volume in the working chamber is compressed, the air pressure increases, and the water stop valve seals the upper port of the dip tube. Since the piston and the piston seat are not completely closed, the gas squeezes the gap between the piston and the piston seat, separating them, and the gas escapes.

Water absorption process:
After exhausting, the pressing head is released, the compressed spring is released, pushing the piston seat to move up, the gap between the piston seat and the piston is closed, and the piston and the compression rod are pushed to move upward together. The volume in the working chamber increases, and the air pressure decreases, which is similar to vacuum, so that the water stop valve opens the air pressure above the liquid surface in the container to press the liquid into the pump body to complete the water absorption process.

Water discharge process:
The principle is the same as the exhaust process. The difference is that at this time, the pump body is already full of liquid. When the pressing head is pressed, on the one hand, the stop valve seals the upper end of the dip tube to prevent the liquid from returning to the container from the dip tube; on the other hand, because the liquid (incompressible fluid) is squeezed, the liquid will rush away from the piston The gap with the piston seat flows into the compression tube. And come out of the nozzle.

2. The principle of atomization
Because the nozzle opening is small, if the pressing is smooth (that is, there is a certain flow rate in the compression tube), when the liquid flows out of the small hole, the liquid flow rate is very large, that is to say, the air at this time has a large flow rate relative to the liquid. , Which is equivalent to the problem of high-speed airflow impacting water droplets. Therefore, the subsequent analysis of the atomization principle is exactly the same as that of the ball pressure nozzle. The air impacts the large water droplets into small water droplets, and the water droplets are refined step by step. At the same time, the high-speed flow of liquid will also drive the gas flow near the nozzle orifice, making the gas near the nozzle orifice increase in velocity and pressure, forming a local negative pressure zone. Thus, the ambient air is mixed into the liquid to form a gas-liquid mixture, and the liquid produces an atomization effect.
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