Abstract: An ionic wind purifier is described. The ionic wind purifier includes a generating electrode and a collecting electrode, which are arranged oppositely. A potential difference exists between the generating electrode and the collecting electrode, and at least one first projecting part is arranged on each collecting electrode plate of the collecting electrode. The first projecting part has a smooth surface. Thus, by arranging the first projecting part, the adsorption area of the collecting electrode is increased and the absorption capability of the collecting electrode is improved, thereby improving the purification efficiency of the ionic wind purifier and improving the use performance thereof. A discharge monitoring and protective circuit of a high-voltage ion purifier is also described.

Abstract: Described is an ion air purifier. The ion air purifier includes a collector module (1) and a repeller module (2) which are connected in an openable and closable manner, wherein several collector plates (11) are uniformly distributed on the collector module (1), and several repeller plates (21) are uniformly distributed on the repeller module (2); and each collector plate (11) and each repeller plate (21) are alternately arranged when the two plates are in a closed state. Thus, an optimized distance between adjacent collector plates (11) and repeller plates (21) is ensured; and when the collector module (1) and the repeller module (2) are in an opened state, the collector plates (11) are separated from the repeller plates (21), and the distance between two adjacent collector plates (11) and the distance between two adjacent repeller plates (21) are both increased, thereby facilitating cleaning of the collector module. Further described is a network air purifier.

Abstract: Provided are a gas purification device and system. The device comprises a gas purification unit; the gas purification unit comprises at least one ionization electrode, at least one repelling electrode and at least one collector; the at least one repelling electrode is provided with electrical potential in the same direction as the electrical potential of the at least one ionization electrode; in the at least one collector is provided with either zero potential or electrical potential in an opposite direction compared with the electrical potential of the at least one ionization electrode; the at least one repelling electrode is used to push the electrified gas particles ionized by the at least one ionization electrode to the at least one collector.

Abstract: An air cleaning apparatus includes ion generation electrode, a collecting electrode, and a support portion. The ion generation electrode is configured to apply a high-voltage to thereby form a high-voltage electric field between the collecting electrode and the ion generation electrode. A passage is formed between the ion generation electrode and the collecting electrode along the high-voltage electric field direction. The support portion is configured to provide electrical isolation and mechanical support for the ion generation electrode and the collecting electrode. A surface of the support portion between the ion generation electrode and the collecting electrode comprises a surface coating layer configured to resist ion bombardment and the accidental arcing. A transformer frequency adjusting system includes a frequency storage cell, a control module, and a drive module, and can work with the air cleaning apparatus, alone, or with other apparatuses.

Abstract: Performance of an electrohydrodynamic fluid accelerator device may be improved and adverse events such as sparking or arcing may be reduced based, amongst other things, on electrode geometries and/or positional interrelationships of the electrodes. For example, in a class of EHD devices that employ a longitudinally elongated corona discharge electrode (often, but not necessarily, a wire), a plurality of generally planar, collector electrodes may be positioned so as to present respective leading surfaces toward the corona discharge electrode. The generally planar collector electrodes may be oriented so that their major surfaces are generally orthogonal to the longitudinal extent of the corona discharge electrode. In such EHD devices, a high intensity electric field can be established in the “gap” between the corona discharge electrode and leading surfaces of the collector electrodes.

Abstract: In thermal management systems that employ EHD devices to motivate flow of air between ventilated boundary portions of an enclosure, it can be desirable to have some heat transfer surfaces participate in electrohydrodynamic acceleration of fluid flow while providing additional heat transfer surfaces that may not. In some embodiments, both collector electrodes and additional heat transfer surfaces are thermally coupled into a heat transfer path. Collector electrodes then contribute both to flow of cooling air and to heat transfer to the air flow so motivated. The collector electrodes and additional heat transfer surfaces may be parts of a unitary, or thermally coupled, structure that is introduced into a flow path at multiple positions therealong. In some embodiments, the collector electrodes and additional heat transfer surfaces may be proximate each other along the flow path. In some embodiments, the collector electrodes and additional heat transfer surfaces may be separate structures.

Abstract: Reversible flow may be provided in certain EHD device configurations that selectively energize corona discharge electrodes arranged to motivate flows in generally opposing directions. In some embodiments, a first set of one or more corona discharge electrodes is positioned, relative to a first array of collector electrode surfaces, to when energized, motivate flow in a first direction, while second set of one or more corona discharge electrodes is positioned, relative to a second array of collector electrode surfaces, to when energized, motivate flow in a second direction that opposes the first. In some embodiments, the first and second arrays of collector electrode surfaces are opposing surfaces of individual collector electrodes. In some embodiments, the first and second arrays of collector electrode surfaces are opposing surfaces of respective collector electrodes.

Abstract: Structures for reducing the effect of charged surfaces near the electrodes on the performance efficiency of an electrohydrodynamic (EHD) device are disclosed. The potential levels on surfaces of an electronic device near the EHD electrodes are varied with respect to a function of the combination of distance from the emitter and the distance from the collector. The potential levels may be constant, may vary in discrete steps, may be continuously variable along the length between the EHD electrodes and beyond the electrodes, and may vary with respect to time.

Abstract: Embodiments of electrohydrodynamic (EHD) fluid accelerator devices utilize collector electrode structures that promote efficient fluid flow and reduce the probability of arcing by managing the strength of the electric field produced at the forward edges of the collector electrodes. In one application, the EHD devices dissipate heat generated by a thermal source in a thermal management system.

Abstract: Reversible flow may be provided in certain EHD device configurations that selectively energize corona discharge electrodes arranged to motivate flows in generally opposing directions. In some embodiments, a first set of one or more corona discharge electrodes is positioned, relative to a first array of collector electrode surfaces, to when energized, motivate flow in a first direction, while second set of one or more corona discharge electrodes is positioned, relative to a second array of collector electrode surfaces, to when energized, motivate flow in a second direction that opposes the first. In some embodiments, the first and second arrays of collector electrode surfaces are opposing surfaces of individual collector electrodes. In some embodiments, the first and second arrays of collector electrode surfaces are opposing surfaces of respective collector electrodes.

Abstract: In thermal management systems that employ EHD devices to motivate flow of air between ventilated boundary portions of an enclosure, it can be desirable to have some heat transfer surfaces participate in electrohydrodynamic acceleration of fluid flow while providing additional heat transfer surfaces that may not. In some embodiments, both collector electrodes and additional heat transfer surfaces are thermally coupled into a heat transfer path. Collector electrodes then contribute both to flow of cooling air and to heat transfer to the air flow so motivated. The collector electrodes and additional heat transfer surfaces may be parts of a unitary, or thermally coupled, structure that is introduced into a flow path at multiple positions therealong. In some embodiments, the collector electrodes and additional heat transfer surfaces may be proximate each other along the flow path. In some embodiments, the collector electrodes and additional heat transfer surfaces may be separate structures.

Abstract: In thermal management systems that employ EHD devices to motivate flow of air through an enclosure, spatial distribution of a ventilation boundary may facilitate reductions in flow resistance by reducing average transit distance for cooling air from an inlet portion of the ventilation boundary to an outlet portion. Some thermal management systems described herein distribute a ventilation boundary over opposing surfaces, adjacent surfaces or even a single surface of an enclosure while providing a short, “U” shaped, “L” shaped or generally straight through flow path. In some cases, spatial distributions of the ventilation boundary facilitate or enable enclosure geometries for which conventional fan or blower ventilation would be impractical.

Abstract: Performance of an electrohydrodynamic fluid accelerator device may be improved and adverse events such as sparking or arcing may be reduced based, amongst other things, on electrode geometries and/or positional interrelationships of the electrodes. For example, in a class of EHD devices that employ a longitudinally elongated corona discharge electrode (often, but not necessarily, a wire), a plurality of generally planar, collector electrodes may be positioned so as to present respective leading surfaces toward the corona discharge electrode. The generally planar collector electrodes may be oriented so that their major surfaces are generally orthogonal to the longitudinal extent of the corona discharge electrode. In such EHD devices, a high intensity electric field can be established in the “gap” between the corona discharge electrode and leading surfaces of the collector electrodes.

Abstract: Multi-stage electrohydrodynamic (MHD) fluid flow acceleration is described. In some embodiments, an EHD fluid accelerator apparatus includes a substrate for thermal conduction and a plurality of electrode structures for thermal conduction therethrough, wherein each electrode structure has a collector electrode portion and a corona discharge electrode portion.