The role and risks of ion fans
The role and risks of ion blowers, the principle of ionization of static electricity eliminators: generating air ions, acting on static power sources to neutralize static electricity.
Ways to allow air to ionize: A. Corona ionization of air under strong electric field conditions generates positive and negative ions; B, A rays and β rays act on air molecules to make them air ions; C, high energy rays (X rays) act on air Let the group ionize; the characteristics of air ions, air ions are different from solution ions, it requires a certain amount of energy to generate, and usually exist in the form of molecular clusters;, air ions also exist in the natural environment, but the concentration is very low; The life of air ions in the air is between a few seconds and a few minutes; positive and negative ions will neutralize each other when they come together; several issues to be considered in the use of ion static eliminators, and the action distance considers two factors: A. The closer the distance is, the faster the speed of eliminating static electricity; B. Different types of ion static eliminators have different effective distances.
The discharge needle of the ion static eliminator with strong electric field ionization is the most prone to aging and damage. Regular cleaning and maintenance can ensure the effectiveness of the equipment.
Elimination of static electricity speed: Consider the index—dissipation speed. Generally, the dissipation speed of 1000V-100V is measured by CPM; Ion balance: Ion imbalance will make objects in the area of action bring surface turtles, so it must be controlled. Ion imbalance only appears in the corona ionization ionization equipment; Other considerations: different types of ionization equipment are suitable for different types of ion fans, AC ion fans:
Simple design, low cost; stable, sine wave ionization efficiency is low, not suitable for occasions requiring rapid neutralization;, different positive page ionization energy makes ionization balancing work difficult;, positive and negative ions alternate generation period is 1/100 or 1/120 second (50 or 60HZ) natural neutralization of ions will further reduce efficiency and require high wind compensation; due to low efficiency, a larger voltage is required to generate enough ions, which will cause many particles, which is not conducive to strict Use in dusty environment.
DC ion fan, continuous high-voltage use ionization efficiency is high, can handle the need of rapid neutralization;, can use lower voltage, suitable for clean workshop use;, can use automatic measurement and feedback control ionization balance;, requires complex control Circuit to ensure the balance of positive and negative ions.
Pulsed DC ion fan, the ion group generated by the pulse reduces the situation of natural neutralization. Allow the ionizer to be far away from the protected object (can reach 5 meters); most commonly used in clean rooms where low air flow may be required; pulse time can be adjusted to suit the airflow or distance requirements of the environment; pulse wave Inducing "voltage swing" voltage changes may be detrimental to some devices.
High-frequency AC ion fan, high-frequency AC above 3000HZ can greatly improve the AC ionization efficiency;, can use lower ionization voltage;, good ion balance;, the discharge needle does not need to be grouped, the size can be made very small , Suitable for use in dust-free workshops, short acting distance, wind compensation.