The principle of the lotion pump is to use the atmospheric pressure
When using it, we first push out the air in the liquid storage chamber (that is, the plastic tube that can absorb the shampoo) by pressing. When the air is exhausted, press the pump head again. To restore the original state, a vacuum will be formed in the liquid storage chamber, resulting in negative pressure. At this time, the pressure in the container is consistent with the atmospheric pressure, then, the pressure in the liquid storage chamber is small and the pressure in the container is large. At this time , Due to the pressure difference, the atmosphere will press the liquid around the mouth of the liquid storage cavity into the liquid storage cavity, giving people the feeling that the liquid is sucked up by the pump head.
 1. Press for the first time---------When we press the press head (ACTUATOR) for the first time, the press head drives the sub-post (SUB-STEM) through the connected main post (STEM) to compress the spring (SPRING) together; During the process, the outer wall of the piston (PTSTON) rubs against the inner cavity wall of the main body (HOUSING), prompting the piston to open the discharge hole of the sub-column (SUB-STEM); Air is discharged through the opened sub-column (SUB-STEM) discharge hole;
2. Press back and forth for many times ------- all the air in the body (HOUSING) is exhausted;
3. Suction ------- press the head (ACTUATOR) by hand through the main column (STEM), the sub-column (SUB-STEM), the piston (PTSTON), and the common compression spring (SPRING) to push the main body (HOUSING) After the air inside is discharged, release the pressing head (ACTUATOR), and the spring (SPRING) moves back (up) due to the loss of pressure. At this time, the piston (PISTON) also moves down through the inner wall of the friction body (HOUSING). The discharge hole of (SUB-STEM) is closed; at this time, the liquid storage cavity in the body (HOUSING) forms a vacuum suction state, the glass ball (BALL) is sucked up, and the liquid in the bottle is sucked through the pipette (DIPTUBE). Body (HORSING) liquid storage cavity.
4. Store liquid ------ Press the head several times, and store the liquid to the body through multiple suctions until the liquid is fully stored.
5. Liquid discharge------------When the liquid in the liquid storage chamber of the body (HOUSING) is full, press the button head (ACTUATOR) again, and the liquid will pass through the discharge hole directly from the press mouth (ACTUATOR) squirting;
Cosmetic plastic pump heads should not be used too frequently, because the resilience of the spring is limited, and each use must be within the elastic range of the spring, and cannot be used forcefully. This is the same as the limitation of a person. collapsed. On average, the pump head should not be pressed more than 10 times, and the interval should not be less than 10 seconds. Allow enough time for it to bounce back. The built-in spring of the cosmetic pump should not be too long. Of course, it is not too short. The selection and determination of the general wire diameter also plays a critical role. Generally speaking, the spring of the ordinary cosmetic pump is 13 and a half turns. Reasonable, so that the resilience and pressing force are just within a reasonable range.