US 6,174,500 B1Granted

Negative ion generating apparatus

AssigneeMitsubishi Denki Kabushiki Kaisha

InventorsJunichi Uno, Hatsuo Yotsumoto

Life of this patent

Estimating the term…

Loading patent…

Abstract

A negative ion generating apparatus includes a ground electrode having a nozzle portion and surrounding a discharge electrode at a position spaced from the ground electrode, a power supply for supplying a negative high voltage to the discharge electrode, a ventilator for drawing air from an inlet and blowing the air between the electrodes. A high voltage induces corona discharges between the electrodes. The ionized negative ion particles produced in the discharge are blown out of an outlet. Alternatively, the ground electrode is a cylinder with a smaller downstream cross-section. The discharge electrode increases the velocity of gas flow and the high speed gas is ionized near the discharge electrode, increasing the rate of generation of negative ion particles. The discharge electrode may include needle electrodes to increase the rate of generation of the negative ion particles.

Claims8

Dependent claims

A negative ion generating apparatus comprising:

a reaction chamber;
a first electrode disposed within the reaction chamber;
a second electrode disposed in the reaction chamber and spaced from the first electrode;
a ventilator drawing gas from a gas inlet and directing the gas through the reaction chamber between the first electrode and the second electrode to generate a gas flow;
a power supply to supply a voltage across the first electrode and the second electrode configured to induce a corona discharge between the first and second electrodes;
an outlet opening for outlet of negative ion particles generated by the corona discharge in the reaction chamber;
and
an adjusting damper for narrowing a gas passage area, disposed in and functioning as a nozzle in the reaction chamber, the adjusting damper including a deflector having a first end pivotably connected to an inner surface of the reaction chamber and a freely rotatable second end, and a spring urging the deflector to narrow a gas passage area for controlling velocity of the gas flow, the first electrode being located adjacent to the second end of the deflector, and the second electrode being located closer to the outlet opening than the first electrode.

5 more elements

Dependencies are inferred from the claim text.