With the gradual improvement of living conditions, the use of many household products has become increasingly convenient, including the application of lotion pumps. A lotion pump, also known as a push-type lotion pump, is a dispensing tool that utilizes the principle of atmospheric pressure balance to dispense lotion from a bottle by pressing the pump. It can also draw in external air to mix with the liquid inside the bottle. Next, I will discuss the working principle of lotion pumps and their important functions and parameters.
When purchasing products containing a lotion pump, it's important to understand that during the pressing process, the pump head is connected to the bottle, and the piston is driven by a compression spring. During the compression of the spring, the outer wall of the lotion pump piston often moves along the inner wall of the chamber due to friction, causing the piston to fully open, and the liquid to be dispensed through the discharge hole in the piston head. When the piston moves downwards, the internal air is expelled from the piston head.
We can completely expel the air from the inner chamber by pressing the pump head multiple times. Then, by pressing the head with your hand, the air in the inner chamber is expelled through the action of the piston rod and compression spring. At this point, when you release the pump head, the spring loses its pressure, and moves downwards again. The piston then moves downwards due to friction with the inner wall, closing the discharge hole.