The spray pump, also known as the sprayer, is the main accessory product for cosmetic packaging containers and one of the content dispensers. The spray pump is a high-speed flow liquid that uses the principle of atmospheric balance to spray the material in the bottle by pressing It will also drive the gas flow near the nozzle orifice, so that the speed of the gas near the nozzle orifice becomes larger, the pressure becomes smaller, and a local negative pressure zone is formed.

Structure of spray pump

1. Main parts of spray pump

Conventional spray pumps are mainly composed of press nozzle/press head, diffuser nozzle, central duct, lock cover, gasket, piston core, piston, spring, pump body, suction tube and other accessories. The piston is an open piston and is connected to the piston seat. , To achieve the effect that when the compression rod moves upward, the pump body is opened to the outside, and when it moves upward, the working chamber is closed. According to the structural design requirements of different pumps, the related accessories will be different, but the principle and the ultimate goal are the same.

2. The principle of spray pump water

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 up 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 is squeezed, the liquid will break through the gap between the piston and the piston seat , Into the compression tube. And come out of the nozzle.

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