The reason why the atomizing nozzle does not spray is analyzed. The atomizing nozzle is designed according to its working under a variety of different spraying conditions. Therefore, only by selecting the appropriate atomizing nozzle can good spray performance be obtained during use. The characteristics of an atomizing nozzle are mainly reflected in its spray type, that is, the shape formed by the liquid as it leaves the nozzle orifice and its performance. Next, the reasons for the failure of atomizing nozzles are analyzed:
First, corrosion. When chemical materials are used to spray the workpiece, these chemicals can also cause corrosion and blockage of the nozzle material. The build-up of chemicals and impurities on the inside or outside edges of the nozzle can cause blockage of the nozzle. This will affect the spray shape of the nozzle and thus the nozzle spray pressure.
Second, erosion. When the liquid with high flow rate passes through the metal surface of the nozzle hole, it will erode the nozzle hole, causing the nozzle pressure to decrease and the spray state to become irregular. The probability of nozzle erosion depends on the hardness of the liquid, the spray pressure, the type of chemical used and its amount. In addition, particulate impurities in the liquid can also severely erode the nozzle.
Finally, accidental damage. Improper use and untimely maintenance are the main causes of accidental damage to nozzles. Although the nozzle orifice is usually designed to be concave, the offset structure of the fan nozzle can be easily damaged.
If the nozzle works at high temperature or abnormal temperature for a long time, the nozzle will be damaged due to material softening. According to the atomization mechanism and experimental research, combined with the experience of coal mine field use, the main ways to improve the nozzle atomization are as follows: increasing gas and liquid The relative velocity difference of the two phases increases the aerodynamic force, so that the droplets are broken into finer pieces under the action of the larger aerodynamic force. The exit velocity of the liquid phase nozzle is increased to enhance the collision, so that the oppositely ejected droplets can be further broken up when they collide.