Types of Electrostatic Spray Nozzle Accumulation For Various Applications
The invention relates to electrostatic spray nozzles and especially to a device of this kind with a novel electrostatic spray nozzle that functions at relatively low voltage levels, produces a fine stream of evenly divided droplets in a high discharge cloud channel, and is very safe, easy, rugged, and effective. The invention also relates to an electrostatic spray nozzle that is used with high voltage rework systems and particularly for the elimination of electrostatics in metallic materials to provide protection against static electricity. A very typical application is in the aerospace and defense industry where electrostatic protection is essential for shock proofing the various components that make up the various aircraft. An example would be the use of high voltage insulating coatings on the airframe and engine surfaces to prevent static electricity from traveling between the metal and the airframe by encapsulating it within the metal. Another application might be the use of high voltage dampers in large dynamic areas such as wings, control surfaces, elevator systems, landing gear housings, pylon links, fan blades, stabilizers, landing gears and much more.
This invention is particularly suitable for use with high power or alternating current (AC) equipment, because the high electrical output creates a charge in the atmosphere. The discharge of this charge (determined by the charging voltage, discharge rate, direction of discharge, etc.) creates a large induced electric field, which is referred to as a charge-field. This charge-field will act to cancel the electrostatic charge that is created in a conventional electrical discharge process.
This is one of several new developments in electrostatic spray nozzle technology. In the preceding decades, nozzles were made by incorporating a long metallic tube with a ventilating section at one end. This ventilating section was designed to discharge the fine divided droplets of the chemical in the liquid stream. When the nozzle was closed, the air inside the tube was forced through the narrow opening into the liquid stream. The valve used to close the sprayer also controlled the discharge of the fine divided droplets. This type of nozzle is called a miniature wet cell.
With the introduction of new techniques for the production of electrostatic spraying devices, the size of the charged particles in the stream became smaller. This allowed the creation of more accurately directed streams of chemicals at lower voltages. Also, the charge-field became more localized, reducing the size of the charged particles in the stream. These improvements led to the development of the electrostatic spray nozzle with vents and fine-divided droplets that made it more efficient.
Electrostatic electrostatics are a form of electro-mechanical phenomena that are the result of the action of charge carriers on a distant neutral point. These electrostatic charges occur when two electrically conductive bodies or more are connected and there is a time period during which the charge carrier is present. This forms a field that has very high electric field strength. This strength is dependent on the dimension of the area and the length of the path of the charged particles. When the electrostatic spray nozzle is used, this field is created by passing an electric current through the charging source. The end result is the generation of a localized electric field that has high voltage power, which is useful in the generation of electrostatic forces.
In the electrostatic spray nozzle comprised of a ventilated air cylinder, the fine droplets of the chemical are accelerated to high velocity air streams by the air pressure created by the vent. The speed of the high velocity air stream is controlled by a variable valve control. This is so the size of the droplets is limited to those needed for the application being conducted. The size of the droplets is dependent on the concentration of the charged particles to be accelerated.
Another type of electrostatic nozzle includes the electromagnetic induction nozzle. This is identical with the electronic induction nozzle; only the primary electrostatic force comes from an alternating magnetic field. This is similar to the electromagnetic induction generators. It is widely used to apply the static charge to a variety of materials such as drywall, painted ceiling tiles, plastics, rubber, paper, wood, dry fiber insulation and composites.
These devices must have a high-voltage supply, as well as a suitable discharge rate to be effective. The high voltage supply is needed to create the necessary alternating magnetic field that causes the droplets to be accelerated to very high speeds. The discharge rate is used to reduce the potential for electrical hazard to the extent possible.