Abstract: An improved corona generator structure includes a ground tube body sheathed within an insulating sleeve. One end of the ground tube body is provided with a sealing lid for being firmly coupled to the end portion of the ground tube body. At least one piece of high voltage electrode plate is coupled with the insulating sleeve. The high voltage electrode plate is provided with a plurality of spacers for allowing a gap of a substantially equal height to be formed between every area of the high voltage electrode plate and the insulating sleeve so as to uniformly distribute the corona on the high voltage electrode plate when electricity conducts therethrough. Furthermore, the two retaining sleeves are coupled to both end portions of the high voltage electrode plate and the insulating sleeve such that the high voltage electrode plate is firmly positioned on the insulating sleeve.

Abstract: An improved corona generator structure includes a ground tube body sheathed within an insulating sleeve. One end of the ground tube body is provided with a sealing lid for being firmly coupled to the end portion of the ground tube body. At least one piece of high voltage electrode plate is coupled with the insulating sleeve. The high voltage electrode plate is provided with a plurality of spacers for allowing a gap of a substantially equal height to be formed between every area of the high voltage electrode plate and the insulating sleeve so as to uniformly distribute the corona on the high voltage electrode plate when electricity conducts therethrough. Furthermore, the two retaining sleeves are coupled to both end portions of the high voltage electrode plate and the insulating sleeve such that the high voltage electrode plate is firmly positioned on the insulating sleeve.

Abstract: A refine on the generate corona discharges which contains one base; one low-voltage plate that is set in the base; one insulating board that covers the low-voltage plate; one high-voltage plate; and one cover board that fixes the high-voltage plate in position. The high-voltage plate is suspended and is as close as possible to the insulating plate, thereby greatly reducing the noise that accompanies the occurrence of coronas; also, said high-voltage plate is in a paper-clip shape that facilitates the production of ozone ?O.sub.3 ! from the oxygen molecules ?O.sub.2 ! contained in the air that passes through the corona area.

Abstract: An apparatus to generate corona discharges that consists of (a) a ground electrode tube, (b) a single-opening insulating tube inserted into the ground electrode tube, (c) a high-voltage electrode tube inserted into the insulating tube, and (d) two insulating caps. An air gap is formed between the ground electrode tube and the insulating tube. The high-voltage tube is inserted in the center of the assembly, which is held in position by the insulating caps.

Abstract: An improvement of an aquarium air pump, which is characterized by the fact that one end of an air-compressing diaphragm in the air pump is slipped into the intake valve housing of the air pump, while the other end is bound to a vibrating lever as one unit, that the diaphragm should be made of Teflon.RTM. or silicone rubber, that a limiting rod is placed at an appropriate position in the casing of the air pump and is allowed also to press against the vibrating lever. With the configuration pertaining to the present invention, the air pump can compress air more effectively and the working life of the diaphragm can be prolonged by preventing it from being damaged caused by back pressure in the event the air outlet is clogged.