Abstract: A dual-filter electrically enhanced air-filtration apparatus and method are described. One embodiment includes an upstream electrically enhanced filter; a downstream electrically enhanced filter; a first control electrode adjacent to an upstream side of the upstream electrically enhanced filter; a second control electrode adjacent to a downstream side of the downstream electrically enhanced filter; and an ionizing electrode disposed between the upstream and downstream electrically enhanced filters, the ionizing electrode having an electrical potential with respect to the first and second control electrodes. Optional field electrodes may be included to enhance the electric fields associated with the upstream and downstream electrically enhanced filters.

Abstract: Disclosed are apparatus, system, and method for enhancing air purification efficiency regarding a gaseous medium passing through an opening. Included is a high voltage source that creates an effective voltage field across the opening; and at least one charge bleeding element constructed and arranged to maintain an effective voltage field across the opening.

Abstract: Disclosed is a filtration enhancement apparatus and an associated method. The apparatus includes a number of electromagnetic grids that are placed in series. The first grid conditions ambient particles to generate particles with both a positive and a negative charge. These charged particles are then delivered to a second and third grid wherein a low, medium, and/or high frequency alternating current is employed to force the positive and negative charged particles to collide and conglomerate with one another. The conglomerated particles are then sent into the ambient environment for subsequent filtration.

Abstract: An air purifier includes a main frame, a discharging device, a dust collection device and a voltage generator. The discharging device has a discharging portion and is installed in the main frame. The dust collection device has a dust collection portion and is installed in one side of the discharging device. The air purifier can produce ozone, negative ions and static electricity by moving the discharging portion and the dust collection portion and receiving suitable voltage. The voltage generator, the discharging portion, and the dust collection portion accomplish conduction. Production of ozone, negative ions and static electricity occurs according to separation between the discharging portion and dust collection portion, as well as the particular environment of operation, thereby improving air quality.

Abstract: An air conditioning device comprises a substantially thin collector electrode capable of forming ions at a front and/or rear edge when charged. The thin collector electrode preferably having an insulating material disposed on the front and/or rear edge to prevent ions from being emitted therefrom. The collector electrode capable of being in the form of a thin elongated blade whereby an emitter electrode is upstream of the front edge or alternatively downstream of the front edge. The collector electrode alternatively in the form of a cylindrical structure or a porous grid having a plurality of air passageway cells therethrough.

Abstract: An apparatus for filtering particulate matter from a gas. The apparatus includes at least one tube with a substantially axially located ionizer structure, and a fan for propelling the gas through the at least one tube. The ionizer structure includes a flat blade extending axially along at least a substantial part of the tube and having a saw tooth shape with a high number of sharp teeth placed regularly along the blade edges. The blade is twisted about its own longitudinal centerline to provide rotation for a gas stream flowing along the tube.

Abstract: In a discharge device for performing streamer discharge between a discharge electrode (41) including a plurality of discharge parts (61) and a counter electrode (42) including a plurality of counter parts (62) confronting the discharge parts (61), a resistor (60) is provided in a current carrying path between power source means (45) and the discharge parts (61).

Abstract: An air conditioning system for automotive vehicles includes an air conditioning case having an internal passageway and an ionizer for emitting positive ions and negative ions into the internal passageway of the air conditioning case. The ionizer includes a main body and first and second discharge electrodes extending from the main body into the internal passageway in a spaced-apart relationship with each other. The air conditioning system further includes an electric short preventing arrangement for preventing moisture positioned in and around the first and second discharge electrodes from causing electric short between the first and second discharge electrodes. The electric short preventing arrangement comprises a water drainage rib for draining the moisture condensed in and around the first and second discharge electrodes to prevent the electric short between the first and second discharge electrodes.

Abstract: In an ionizer composed of an electrode needle cartridge and a main body block, the electrode needle cartridge is provided with an electrode needle for generating an ion, a high voltage generating device for applying high voltage to the electrode needle, and a receiving connector for connecting a feeding connector, and the main body block is provided with an air-blowing outlet serving as an electrode needle housing portion, an air passing-through hole for supplying air to the air-blowing outlet, and a connecting port for connecting an air piping. The electrode needle cartridge is configured such that when the electrode needle cartridge and the main body block are connected or separated, the electrode needle is inserted into or removed from the air-blowing outlet from a rear end portion side of the air-blowing outlet.

Abstract: An airborne particulate sampling device is disclosed. The device includes a conduit whose interior allows the flow of air through the device. The conduit, or at least its surface, is a conductor. The device also includes an electrode with a sharp tip or edge on or near the output side of the conduit. An electrically conducting particle collector outside the conduit is positioned so that a surface is perpendicular or approximately perpendicular to the axis of the funnel. A fan or other blower forces air through the funnel. A power supply imparts an electrostatic potential difference between the electrode, on the one hand, and the holder and particle collector, on the other hand. The electrostatic potential difference produces a corona field in the air in the vicinity of the electrode's sharp tip. The corona field imparts a charge to airborne particles.

Abstract: To improve anti-corrosion property in a wet-type electric dust collector while ensuring discharge function. A coating layer of thermoplastic resin is provided to an entire surface of a needle-type rigid discharge electrode including a support pipe and a discharge needle of an electric dust collector for removing a corrosive mist in an exhaust gas. Then, the coating layer on a tip surface of the discharge needle is coarsely polished and removed to expose a coarse discharge edge surface.

Abstract: An apparatus for filtering particulate matter from a gas. The apparatus includes at least one tube with a substantially axially located ionizer structure, and a fan for propelling the gas through the at least one tube. The ionizer structure includes a flat blade extending axially along at least a substantial part of the tube and having a saw tooth shape with a high number of sharp teeth placed regularly along the blade edges. The blade is twisted about its own longitudinal centerline to provide rotation for a gas stream flowing along the tube.

Abstract: Air cleaning device has a particle charging zone comprising a conducting sheet having a plurality of apertures, through which air can be passed, and a plurality of corona emitters each associated with an aperture, and a filter.

Abstract: The present invention provides a ballast circuit and method for fabricating the same for multi-electrode corona discharge arrays. The circuit includes a conductive plastic material and at least one corona electrode protruding from the conductive plastic material. The distance between the plastic material and the corona electrode varies and controls the electrical resistance and determines the voltage breakdown of the circuit. Additionally, a particle collection surface may preferably be located within the conductive plastic material or preferably be separated from the material depending on the circuit design and configuration.

Abstract: The electrostatic precipitator (1) includes the housing (8) having the air duct (7) for communicating between the inlet (4) for sucking the contaminated air (3) and the outlet (6) for discharging the cleaned air (5), the air flow generator (10) generating the air flow (9) in the air duct (7), the collecting section (14) having a plurality of adsorption plates (13) rotating in accordance with the adsorption shaft (11), and the discharge section (24) equipped with the charging plate (20) having the discharge surface (21) opposing the adsorption surface (12) of the adsorption plate (13) and a plurality of the discharge electrodes (19) provided at the edge (22) of the charging plate (20) opposite the suction inlet.

Abstract: An electrostatic ionization system in a precipitation device for purifying a gas stream passing through it includes: an electrically conductive plate including a plurality of nozzles configured for passage of the gas stream; a sleeve positive-fittingly disposed on each nozzle; a high-voltage grid; a plurality of rod-shaped high-voltage electrodes each having an end connected to the grid and an exposed free end arranged identically centrally in a corresponding one of the nozzles, the electrodes each forming a circumferential gap and arranged at an electrical potential of the grid, wherein the free end of each of the electrodes is exposed downstream after the corresponding nozzle, wherein a wall of each sleeve is permeable to the gas stream and includes at least one of a grid, a perforated sheet and individual rods equidistantly spaced from each other and having free ends terminating in a holding ring.

Abstract: An oxygen separator for separating oxygen from ambient air utilizing a vacuum swing adsorption process has a mass of less than 2.3 kg. A carrier is mountable on a person to support the oxygen separator for ambulatory use.

Abstract: An air particle precipitator and a method of air filtration include a housing unit; a first conductor in the housing unit; a second conductor in the housing unit; and a carbon nanotube grown on the second conductor. Preferably, the first conductor is positioned opposite to the second conductor. The air particle precipitator further includes an electric field source adapted to apply an electric field to the housing unit. Moreover, the carbon nanotube is adapted to ionize gas in the housing unit, wherein the ionized gas charges gas particulates located in the housing unit, and wherein the first conductor is adapted to trap the charged gas particulates. The air particle precipitator may further include a metal layer over the carbon nanotube.

Abstract: An air conditioning apparatus includes a cabinet having air inlet and outlet openings and an intense field dielectric air filtration system disposed in the cabinet between the inlet and outlet openings. The filtration system includes a field charging unit and a filter unit. The filter unit may be mounted for removal from the cabinet on spaced apart support brackets connected to the cabinet or to a frame of the field charging unit. Electrical contact elements may be supported by the support brackets for engagement with corresponding contact elements on the filter unit and charging unit for establishing electrical communication between a power supply and the charging unit and filter unit, respectively. A shorting bar is aligned with the contact members on the filter unit for discharging high voltage potential upon removal of the filter unit from the cabinet.

Abstract: The present invention relates to a conducting filter (110) adapted for gas purification and a filter assembly (150, 200, 300, 400, 500, 600) comprising such filter. The conducting filter is made from a polymer which has received significantly increased electrical conductivity by a doping process. Such doped polymers are referred to as synthetic metals. Thanks to the electric properties of the synthetic metal, the filter according to the invention, comprising such polymer, can be supplied with electrical charge and thereby maintain its efficiency with regards to the electrostatic properties during operation. In the filter assembly according to the invention, the conducting filter is supplied with electrical charge by connecting it to a high voltage source.

Abstract: An air cleaner is described wherein an ion wind is generated by an ionizing element and directed to pass over a dust collector surface. By proper design and adjustment of the ionizing element and collector, the unit can be operated without emitting charged particles, if any, in other than the direction of orientation of the dust collector surface and thus avoiding smudging of the surrounding walls. The collector may be cylindrical in form and may be separately detachable, rendering it readily available for cleaning.

Abstract: A method and apparatus electrically charges particulates that need to be removed from a moving air stream. Various methods of corona charging of particulates are used in the fields of electrostatic precipitation of dust, printers and copying machines. This invention is preferably specifically aimed at improving the separation and collection of particulates from dust, mist or vapor generating devices. In another embodiment, a grid electrostatic precipitator, in combination with a corona pre-charger, is used to remove diesel exhaust.

Abstract: A compact, hybrid particulate and gas collector that can be used in a vehicle emissions control system, gas turbine, or in any other application where space and lower cost is important or in applications where sub-micron and nano-particulate filtering is needed. A gas flow enters the device in a first chamber and can be immediately exposed to a high-tension corona discharge electric field which typically results in a strong ionic flow by charging and collecting the incoming effluent (oil mist, soot particles, etc.). Subsequently, the charged flow enters a second zone of high-tension uniform electric field that causes the remaining charged particles to migrate to one of the charged electrodes. One of the electrodes can be made of porous filter material that allows the cleaned gas to flow into an exit zone also containing a high-tension uniform electric field where the remaining effluent can be collected prior to the clean gas exiting either to ambient air or being re-circulated to be used again by the engine.

Abstract: A compact, hybrid particulate and gas collector that can be used in an ultra-clean air purification, vehicle emissions control system, gas turbine, or in any other application where space and lower cost is important or in applications where sub-micron and nano-particulate filtering is needed such as in clean rooms and surgical suites. A gas flow enters the device in a first chamber and can be immediately exposed to a high-tension corona discharge electric field which typically results in a strong ionic flow by charging and collecting the incoming effluent (oil mist, soot particles, etc.). Subsequently, the charged flow enters a second zone of high-tension uniform electric field that causes the remaining charged particles to migrate to one of the charged electrodes.

Abstract: A system for decontaminating a gas is provided. The system includes: a passageway containing at least one set of two or three electrodes. If the set contains three electrodes, it has two outer electrodes electrically connected together and one inner electrode.

Abstract: An apparatus (10) and method for recovering elemental carbon, elemental sulfur, elemental iron, elemental gold and other elemental materials from an air flow including a funnel-shaped receptor (14) and an inverted cone-shape electrode node body (12) spaced from the funnel receptor, a funnel-shaped reaction zone (45) between the outer surface of the electrode node body and the inner surface (60) of the receptor for receiving the air flow, and a plurality of point source electrodes (36) mounted to the electrode node body (12) and projecting into the reaction zone (45). The electrode node body (12) and the receptor (14) are electrically isolated from each other, the receptor (14) is connected to ground, and a voltage source is electrically connected to the electrode node body (12).

Abstract: An electrostatic precipitator includes an inertial gas-contaminant impactor separator providing two stage separation and reducing contaminant collection load on the collector electrode at the corona discharge zone to reduce contaminant build-up thereon and extend service intervals for cleaning or replacement thereof.

Abstract: The present invention is an air purifier including an ionizing assembly that operates to charge particulate material in an air flow passing through the purifier. The charged particulate material is attracted to and retained by a filter element disposed downstream of the ionization assembly and having an electrical charge opposite to the charged particulate material. The purified air passing through the filter is directed out of the device, optionally in conjunction with a fragrance that is added to the purified air flow. The ionizing assembly is formed with a ground member disposed adjacent the ionizing member to keep the electrons generated by the ionizing assembly within the purifier, and thus prevent static discharges from occurring outside of the purifier. The air flow is directed by a fan through the purifier in an angular and substantially laminar manner, such that the efficiency of the purifier is increased.

Abstract: A wet electrostatic ionization stage in an electrostatic separation device for purifying a flowing aerosal including finely dispersed particles entrained in a gas. The wet electrostatic ionization stage includes a plate disposed across a cross section of a flow channel and connected to a ground potential or reference counterpotential. The plate includes substantially identical openings through which the gas flows. The wet electrostatic ionization stage also includes a high-voltage grid disposed across the cross section of the flow channel either upstream or downstream from the plate and electrically isolated from a wall of the flow channel. The high voltage grid is coupled to a high voltage potential via a bushing disposed in the wall of the flow channel. For each opening in the plate, a rod-shaped high-voltage electrode coupled at one end to the high-voltage grid has a free end projecting centrically into the one opening.

Abstract: Positive and negative electrode needles, an air-blowing outlet, and a protection cover for covering these electrode needles and the air-blowing outlet are attached to an electrode cartridge which is attached to a housing, and an air-blowing hole positioned in front of the air-blowing outlet in a concentric manner therewith, for blowing out air from the air-blowing outlet toward the outside, and two air-flowing-out holes positioned in a concentric manner with the respective positive and negative electrode needles, and respectively surrounding outer peripheries of respective tip end portions of respective electrode needles via respective gaps for flowing out the air are formed in the protection cover.

Abstract: An electrostatic dust collector includes a dust charging section and a dust collecting section. The dust charging section includes: a discharge electrode which is made up of a plurality of paralleled discharge wires, and a counter-electrode which is made up of a metal honeycomb net. The dust collecting section includes: positive metal electrodes and negative metal electrodes disposed alternately, and insulating spacers disposed between each of positive metal electrode and negative metal electrode.

Abstract: The invention relates to an electrostatic separator (1) for separating particles containing oil out of a gas stream, having an emission electrode (2) and a deposition electrode (3), wherein the emission electrode (2) has a front corona region (4) extending into the gas stream and a rear deposition region (5). An outlet opening (9) for separated oil running along the deposition electrode (3) is provided at the level of, or behind, the deposition region (5) of the emission electrode (2).

Abstract: A method to facilitate improving electrostatic precipitator performance is provided. The method includes providing an electrostatic precipitator including an inlet, a collector chamber and an outlet, where the collector chamber includes a plurality of discharge electrodes and a plurality of collector electrodes. The method also includes defining a respective discharge electrode V-I performance for each of the plurality of discharge electrodes, identifying a particle removal characteristic for each respective discharge electrode based on the respective discharge electrode V-I performance for each of the plurality of discharge electrodes and positioning each of the plurality of discharge electrodes in the electrostatic precipitator according to the particle removal characteristic for each respective discharge electrode.

Abstract: A device and a method for removing undesirable gases and particles from the air are provided. The device includes a purifying chamber through which air (1) to be purified is arranged to pass and has an entrance end provided with a zone (2) producing water dust. The purifying chamber is provided with ionemitting tips (3) operating by high voltage current and with collecting surfaces (4) collecting impurities from the air. The zone (2) is provided with dies (7) producing water dust having a droplet size of 20 to 40 ?m, and the collecting surfaces (4) are grounded. The ion emitting tips (3) are directed toward the collecting surfaces (4) and generate ion jets rushing from the ion emitting tips (3) causing water dust and gases and particulate materials attached to the droplets of said dust to be forced against said collecting surfaces (4).

Abstract: A negative ion generator includes: a flat dielectric layer having a planar surface; a plurality of conductive lines that are attached to the planar surface of the dielectric layer, and that define a plurality of ion-discharging points, respectively; and a high voltage generating circuit coupled to the conductive lines for actuating emission of electrons from the ion-discharging points of the conductive lines.

Abstract: An air cleaning device includes a bulb-shaped casing provided at one end with an attached portion to be attached an attaching portion and connected to a commercial power source and at the other end with an outlet, an ozone generator accommodated in the casing and an air supply portion formed in the casing for supplying air into the ozone generator. The ozone generator includes a needle first electrode having a distal end directed to the outlet and a cylindrical second electrode concentric with the first and second electrodes. Application of high voltage between the first and second electrodes induces electrical discharge therebetween, generates negative ions and ozone and releases a stream of air containing the generated negative ions and ozone from the first electrode to the second electrode and outlet.

Abstract: Disclosed is a filtration enhancement apparatus and an associated method. The apparatus includes a number of electromagnetic grids that are placed in series. The first grid conditions ambient particles to generate particles with both a positive and a negative charge. These charged particles are then delivered to a second and third grid wherein a low, medium, and/or high frequency alternating current is employed to force the positive and negative charged particles to collide and conglomerate with one another. The conglomerated particles are then sent into the ambient environment for subsequent filtration.

Abstract: An air particle precipitator and a method of air filtration include a housing unit; a first conductor in the housing unit; a second conductor in the housing unit; and a carbon nanotube grown on the second conductor. Preferably, the first conductor is positioned opposite to the second conductor. The air particle precipitator further includes an electric field source adapted to apply an electric field to the housing unit. Moreover, the carbon nanotube is adapted to ionize gas in the housing unit, wherein the ionized gas charges gas particulates located in the housing unit, and wherein the first conductor is adapted to trap the charged gas particulates. The air particle precipitator may further include a metal layer over the carbon nanotube.

Abstract: A replacement discharge electrode including a plurality of tubular telescopically assemblable discharge elements, and a tensioning element, tensioning the cable when the tubular telescopically assemblable discharge elements are aligned forming a rigid unitary tubular replacement discharge electrode. The discharge electrode components include abuttable tubular sections, center support tubes telescopically received within the abuttable tubular sections and outer tubular sleeves or collars, forming a rigid discharge electrode having excellent electrical properties. The method includes loosely assembling the tubular component on a flexible cable and tensioning the cable to form a rigid mast-type discharge electrode.

Abstract: A modular frame for use in air purification devices is described. In one aspect of the invention, a plurality of frame members are arranged in a linked stack to form a housing for components of an air purification device. The frame members are arranged to define a flow channel through which a fluid stream passes and to support components of the air purification device that receive the fluid stream. In another aspect of the invention, a plurality of rods are arranged to pass through the frame member stack. A first one of the rods serves as an electrical power source at a first potential and a second one of the rods serves as an electrical power source at a second potential. Electrical connectors are provided to electrically couple electrodes on selected components of the air purification device to their associated rods. In devices that utilize electrostatic filters, the electrodes that are connected to the rods may include the electrodes of the electrostatic filters.

Abstract: A cyclone dust-separating apparatus in which the electrical field and particle charge can be uniform and stable. The cyclone dust-separating apparatus comprises: a cyclone body; an air intake pipe, through which air flows from outside into the cyclone body; an air exhaust pipe, through which air flows out of the cyclone body; a grounding member installed on the inside surface of the cyclone body; a plurality of discharge electrode members installed on the air exhaust pipe; and a high voltage power source connected to the air exhaust pipe. The air exhaust pipe conducts electricity, and the discharge electrode members are installed on one or more sides of the air exhaust pipe, are needle-shaped, and protrude from the outer surface of the air exhaust pipe so as to form a uniform and stable electrical field.

Abstract: A cyclone dust collecting device using a corona discharge is provided. The cyclone dust collecting device includes a cyclone chamber rotating air drawn in from the outside to separate contaminants from the air, a discharge pipe guiding the air separated from the contaminants to the outside of the cyclone chamber and including a discharge electrode part with at least a part made of a conductive material and a power supply unit supplying a power to the discharge electrode part for the discharge electrode part to perform a corona discharge.

Abstract: An oil separator for pressurized systems having flowing vapor with entrained oil particles, the separator including an electrically conducting enclosure having an inlet for the oil bearing vapor and a first outlet for the vapor and a second outlet for the separated oil, an electrically conductive screen positioned within the enclosure to receive the entire flow from said vapor inlet, said screen being electrically insulated from the inlet and enclosure, and a high voltage mono-polarity source connected between the screen and the enclosure. A needle-like electrode at the same potential as the enclosure is positioned at the vapor inlet to accentuate the electric field, thereby improving separation.

Abstract: The electric dust collector has an oblong holding unit provided on the air channel of an air conditioner or the like; a high-voltage applying device provided at an end of the holding unit; a front-open contact protector of substantially inverted U-shape that contains a high-voltage power feeding terminal connected to the high-voltage applying device; a filter unit attached to the holding unit; and a slide projection provided on the filter unit. The slide projection has a high-voltage power receiving terminal removably fitted into the contact protector, allowing the filter unit to be removably attached to the holding unit. The high-voltage power feeding terminal covered with the contact protector is free from dust collection. The structure can prevent contact failure or electrical leak.

Abstract: The air conditioning system includes a housing having a vent portion and an ion generating unit positioned in the housing. The ion generating unit includes a first electrode, at least one second electrode, and a voltage generator that provides a constant potential difference between the first electrode and the second electrode. The second electrode is removable through a bottom surface of the housing from a resting position within the housing to a location external to the housing, and the second electrode is returnable through the bottom surface of the housing.

Abstract: The present invention relates to a filter device for separating particles from a gaseous fluid sucked in by a gas turbine, the filter device having a vertically situated tubular electric filter. Maintenance work on a gas turbine may thus be significantly reduced and, in addition, a higher gas turbine output may be achieved due to low pressure loss of the tubular electric filter.

Abstract: An ultrasonic solution separator including an ultrasonic atomization chamber supplied with a solution containing a target material; an ultrasonic oscillator producing mist from the solution in the ultrasonic atomization chamber with ultrasonic oscillation; a power supply for ultrasonics connected to the ultrasonic oscillator, and a collection portion transporting the mist produced by the ultrasonic oscillator with a carrier gas and aggregating and collecting the mist included in the carrier gas. The power supply supplying high-frequency power to the ultrasonic oscillator so that the ultrasonic oscillator oscillates at an ultrasonic frequency. The ultrasonic separator aggregates and collects the mist produced in the ultrasonic atomization chamber by means of the collection portion. With this ultrasonic solution separator, the temperature of carrier gas in the ultrasonic atomization chamber is at least 5° C. higher than the carrier gas in the collection portion.

Abstract: An apparatus, which collects particulate matter contained in a gas flowing through a flow path formed in a cylindrical shape having an outer surface and an inner surface, includes: an outer shell that forms the outer surface of the flow path; a ground electrode that forms the inner surface of the flow path; a filter layer that is arranged between the outer shell and the ground electrode; and a discharge electrode that generates, when a voltage is applied, an ion wind inducing a secondary flow toward the ground electrode in a direction transverse to the flow path. The secondary flow passes through the ground electrode and the filter layer having a predetermined aperture ratio.

Abstract: An electrostatic dust precipitator (1) is constructed mainly to include a housing (11) in which an air path (10) communicating between an inlet (8) and an outlet (9), an airstream generating unit (14) that causes generation of an airstream in the air path (10), a discharging unit (2) and a discharge guide unit (3) that charge fine particulate (103) with a corona discharge (100), a charging unit (4) that causes the fine particulate (103) charged with the corona discharge (100) to repel in accordance with a coulomb force, an attracting unit (5) that allows the fine particulate (103) to be attracted in accordance with the coulomb force and that thereby collects the fine particulate (103), a voltage supply unit (15) that supplies a discharge voltage for generation of the corona discharge (100) and for repelling by the charging unit (4) in accordance with the coulomb force, and a drive controller unit (20) that causes rotational driving of discharge plates and attracting plates.

Abstract: The present invention relates to a discharge electrode (1) for use in an electrostatic precipitator in combination with one or more collecting electrodes, wherein the discharge electrode (1) has the form of a tubular element (2). The discharge electrode (1) includes electrode elements (3) that consist of tongues (4) bent out from the wall (5) of said tubular element, said tongues also be bent upwards. The invention also relates to a method of producing the discharge electrode.