The size of the pump head is determined by the diameter of the matching bottle
The main accessories
The conventional spray pump is mainly composed of a nozzle/head, a diffusion nozzle, a central duct, a lock cover, a gland, a piston core, a piston, a spring, a pump body, a straw, and the like, wherein the piston is an open piston and is connected to the piston seat. When the compression rod is moved upwards, the pump body is opened to the outside, and when the movement is upward, the working chamber is closed. According to the structural design requirements of different pumps, the related accessories will be different, but the principle is the same as the final purpose, which is to effectively take the contents.
The principle of water
Assume that there is no liquid in the base working chamber in the initial state. Pressing 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 is increased, and the water stop valve seals the port on the water pipe. Since the piston and the piston seat are not completely closed, the gas squeezes the gap between the piston and the piston seat to separate it and the gas escapes.
Water absorption process:
After venting, the pressing head is released, the compressed spring is released, the piston seat is pushed up, the gap between the piston seat and the piston is closed, and the piston and the compression rod are pushed upward together. The volume in the studio is increased, the air pressure is reduced, and the vacuum is approximated, so that the water stop valve opens the air pressure above the liquid level 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 filled with liquid. When the pressing head is pressed, on the one hand, the water stop valve seals the upper end of the water pipe to prevent liquid from returning from the water pipe to the container; on the other hand, since the liquid (incompressible fluid) is squeezed, the liquid will open the piston The gap with the piston seat flows into the compression tube. And come out of the nozzle.
The principle of atomization
Since the nozzle opening is small, if the pressing is smooth (that is, there is a certain flow velocity in the compression tube), when the liquid flows out of the small hole, the liquid flow rate is large, that is, the air at this time has a large flow rate with respect to the liquid. It is equivalent to the problem of high-speed air current impacting water droplets. Therefore, the analysis of the atomization principle is exactly the same as that of the ball pressure nozzle, and 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 flowing liquid also drives the gas flow near the nozzle opening, so that the velocity of the gas near the nozzle opening becomes larger, the pressure becomes smaller, and a partial negative pressure region is formed. Thereby, the surrounding air is incorporated into the liquid to form a gas-liquid mixture, and the liquid is atomized.
- The distributor is divided into two types: tie type and screw type.
- The size of the pump head is determined by the diameter of the matching bottle. The specification of the spray is 12.5mm—24mm, and the water output is 0.1ml/time—0.2ml/time. It is generally used on the packaging of perfume, gel water and other products. The length of the same nozzle can be determined according to the height of the bottle.
- The method of measuring the nozzle, the dose of the liquid sprayed by the nozzle at one time, there are two methods: the peeling measurement method and the absolute value measurement method. The error is within 0.02g. It is also metered by the size of the pump body.
- Spray pump mold more, higher cost