The principle of dismantling the head of the push-type foam hand sanitizer

The "stock solution" of the push-type foam hand sanitizer has obviously been pre-diluted. Obviously, the key to foaming is that this expanded structure, which is different from ordinary, is completely disassembled. It is observed during the disassembly process of such an installation sequence. The principle and process of foaming are roughly as follows:

The piston of the liquid pump is slidingly matched with the cylinder wall-the liquid is closed but the air is not closed, and the piston of the air pump is in interference fit with the cylinder wall-the air is reliably closed.

The air pump piston is sleeved with the liquid pump piston and assembled as a whole. Press the nozzle position, the liquid and air are compressed simultaneously and the pressure rises, and the pressurized liquid (bright green in the figure) enters the center hole of the piston sleeve and moves upward. At the same time, the pressurized gas (purple in the picture) also enters the casing from the gap between the cylinder and the piston, bubbling the liquid once and moving upward. There is a one-way valve on the top of the piston casing (open when pressing to take out the liquid. Loosen it to close the upper end of the liquid cylinder, use the negative pressure of the liquid cylinder to open the bottom liquid valve, and replenish the liquid from the liquid bottle for later use. See the detailed diagram below) , The primary foaming liquid flows out of the sleeve through this, and goes to the front filter for secondary foaming. When the secondary foaming liquid passes through the filter, it is uniformly and finely foamed again and then enters the nozzle tube, and finally spit out the foamy hand sanitizer from the nozzle to complete The foaming and liquid extraction process of the hand sanitizer. The position and details of the filter screen and release the pressure after taking the liquid. During the spring reset process, the negative pressure in the cylinder will replenish the gas from the one-way valve membrane for use. The cone-shaped one-way valve on the upper part of the piston sleeve of the liquid pump will not repeat the function. . Liquid valve details. After the liquid is taken, the liquid cylinder is under negative pressure during the spring reset process, the liquid in the bottle pushes the glass valve bead, and the hand sanitizer flows into the liquid cylinder for replenishment