JP2004079553A - Discharge device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a discharge device appropriately positioning a central electrode and a counter electrode, eliminating irregular discharge, and effectively purifying ions or ozone. <P>SOLUTION: The discharge device has the central electrode 30 and the counter electrode 31 fixed to an electrode holder 29, a central electrode supporting part 38 and a tube wall 35 are formed in the electrode holder 29, and the ring-shaped counter electrode 31 capped and fixed to the tube wall 35 is concentrically arranged around the central electrode 30 fixed to the central electrode supporting part 38. The central electrode 30 and the counter electrode 31 are connected to a lead wire 47 for power supply on one side of the electrode holder 29, the connection part of the central electrode 30 and the lead wire 47 is housed in a clearance recessed part 36 installed in the electrode holder 29, and sealed with a sealing material 48 filled in the clearance recessed part 36. <P>COPYRIGHT: (C)2004,JPO

Description

The present invention relates to a discharge device for generating negative ions, positive ions, and ozone, and more particularly to a discharge device of a point discharge type.

As a discharge device for generating negative ions and ozone, a creeping discharge method disclosed in Patent Document 1 and a sharp discharge method disclosed in Patent Document 2 are known. In the latter, a discharge device is constituted by a cylindrical counter electrode having both ends open, a center electrode arranged outside the opening of the counter electrode, and an electrode mounting member for holding the positions of both electrodes. Patent Document 3 discloses a discharge device in which a counter electrode is arranged on an outer surface of a cylindrical dielectric and a plurality of discharge electrodes are arranged on an inner surface of the cylinder.

JP-A-11-60209 Japanese Patent No. 3017146 Japanese Utility Model Registration No. 3061585

As described above, according to the discharge device including the cylindrical counter electrode and the center electrode disposed outside the opening of the counter electrode, the generated ozone and negative ions can be opposed without using an electric fan. It can be fed along the cylindrical axis of the electrode. However, since the center electrode is held on the center axis of the counter electrode by the cantilever arm fixed to the electrode mounting member and the electrode holder fixed to the tip of the arm, the tip of the Are easily shifted from the center axis of the counter electrode. When the distance between the opening edge of the counter electrode and the tip of the center electrode becomes uneven, the electric field is locally concentrated and irregular discharge (spark discharge) is generated. There is a possibility that the dielectric may be melted or deteriorated due to overheating. When the surrounding air is taken in and negative ions are generated, dust taken in with the air adheres to the counter electrode and the dielectric cylinder, and the electric field concentrates on the dust mass accumulated during long-term use, which may cause a spark discharge. .

An object of the present invention is to always appropriately maintain the relative positional relationship between the center electrode and the counter electrode, thereby eliminating the local concentration of the electric field and the occurrence of irregular discharge, and always effective even during long-term use. Another object of the present invention is to provide a discharge device capable of generating negative ions, ozone, and the like.

In the discharge device of the present invention, as shown in FIG. 1, a central electrode support portion 38 is formed at the front central portion of the electrode holder 29, and a cylindrical wall 35 is formed around the central electrode support portion 38 by integral molding. The center electrode 30 fixed to the center electrode support portion 38 is centered, and a ring-shaped counter electrode 31 externally fixed to the cylindrical wall 35 is arranged concentrically. The center electrode 30 and the counter electrode 31 are Each side of the electrode holder 29 is connected to a power supply lead wire 47, and a connection portion between the center electrode 30 and the lead wire 47 is accommodated in an escape recess 36 provided in the electrode holder 29, and the escape recess 36 is provided. Is sealed with a sealing material 48 filled in the sealing material.

Further, as shown in FIGS. 1 and 5, the discharge device of the present invention has a center electrode support portion 38 formed at the front central portion of the electrode holder 29, and has a cylindrical shape formed around the center electrode support portion 38 by integral molding. A wall 35 is formed, the center electrode 30 is fixed to the center electrode support portion 38, and the counter electrode 31 is externally fixed to the cylindrical wall 35. The counter electrode 31 is formed of a ring-shaped electrode portion 43 and an electrode portion 43. The electrode portion 43 is concentrically positioned with respect to the central electrode 30 by integrally including a mounting leg 44 extending backward from the rear edge and bending and fixing the mounting leg 44 to the electrode holder 29.

As shown in FIGS. 1 and 11, the discharge device of the present invention has a center electrode support portion 38 formed at the front center portion of the electrode holder 29, and has a cylindrical shape formed around the center electrode support portion 38 by integral molding. A wall 35 is formed, and a ring-shaped counter electrode 31 externally fitted and fixed to the cylindrical wall 35 is arranged concentrically around the central electrode 30 fixed to the central electrode support portion 38, forming the central electrode 30. The discharge needle 40 to be inserted is inserted or press-fitted into a mounting hole at the center of the electrode holder 29 and fixed, and the length of the fixed portion of the discharge needle 40 is longer than the length of the free end side of the discharge needle 40.

In the discharge device of the present invention, the central electrode 30 fixed to the central electrode support portion 38, the cylindrical wall 35, and the counter electrode 31 externally fixed to the cylindrical wall 35 are concentric circles around the central electrode 30. Therefore, the structural strength of the discharge device 16 can be improved while minimizing the number of components, and the positional relationship between the central electrode 30, the cylindrical wall 35, and the counter electrode 31 can be increased over a long period of time. Positioning can be properly performed over the entire area. Therefore, it is possible to reliably prevent the electric field from being locally concentrated and the irregular discharge from occurring. Since the center electrode 30 is well prevented from displacing even during long-term use, negative ions, ozone, and the like can always be effectively generated. Further, since the connection between the center electrode 30 and the lead wire 47 is accommodated in the escape recess 36 provided in the electrode holder 29 and is sealed with the sealing material 48 filling the escape recess 36, the center electrode 30 and the lead Spark discharge can be prevented from occurring on the side of the connection between the counter electrode 31 and the lead wire 47. (Claim 1)

In the discharge device of the present invention, the electrode holder 29 is formed with the central electrode support 38 and the cylindrical wall 35. The central electrode 30 is fixed to the central electrode support 38 and faces the cylindrical wall 35. The electrode 31 is externally fitted and fixed. The counter electrode 31 integrally includes a ring-shaped electrode portion 43 and a mounting leg 44 extending rearward from a rear edge of the electrode portion 43, and the mounting leg 44 is bent to the electrode holder 29. By fixing the electrode portion 43 concentrically with respect to the central electrode 30 by fixing the central electrode 30, the central electrode 30 fixed to the central electrode support portion 38, the cylindrical wall 35, and the external wall fitted to the cylindrical wall 35. Since the three fixed counter electrodes 31 are arranged concentrically around the center electrode 30, the structural strength of the discharge device 16 can be improved while minimizing the number of components, and the center electrode 30 can be improved. When After that can be properly positioned over the tripartite positional relationship between the wall 35 and the counter electrode 31 to the long term, since the fixing by bending the attachment leg 44 in the electrode holder 29, the fixed electrode portion 43 is stabilized. (Claim 2)

In the discharge device of the present invention, the electrode holder 29 is formed with the central electrode support portion 38 and the cylindrical wall 35, and the central electrode 30 fixed to the central electrode support portion 38 is centered on the cylindrical wall 35. A ring-shaped counter electrode 31 externally fitted and fixed is arranged concentrically, and the discharge needle 40 constituting the central electrode 30 is inserted or press-fitted into a mounting hole at the center of the electrode holder 29 and fixed. Since the length of the fixed portion of the discharge needle 40 is longer than the length of the free end of the discharge needle 40, the center electrode 30 fixed to the center electrode support portion 38, the cylindrical wall 35, and the outer wall fixed to the cylindrical wall 35. Since the three opposing electrodes 31 are arranged concentrically with the center electrode 30 as the center, the structural strength of the discharge device 16 can be improved while minimizing the number of component parts, and the center electrode 30 and the cylinder can be improved. Pair with wall 35 The positional relationship between the three electrodes and the electrode 31 can be properly determined over a long period of time, the effect of preventing the center electrode 30 from wobbling is high, and the positional relationship between the central electrode 30, the cylindrical wall 35, and the counter electrode 31 can be properly adjusted. Can be positioned. (Claim 3)

FIGS. 1 to 5 show an embodiment in which the discharge device of the present invention is applied to a hair dryer. In FIG. 2, the hair dryer has a horizontally long tubular main body case 1 and a handle 2 provided on one side of the lower surface thereof, and a blower unit, control electric parts and the like are housed inside these. On the front end side of the main body case 1, an air conductor 1A for guiding the flow of air generated by the fan 6 (blower) is mounted. On the front and rear surfaces of the handle 2, there are provided a power switch knob 3 which serves both as an air volume control and a heater switch, and an ion switch knob 4 which turns on and off the power supply to the ion generator. A switch that is operated by the switch knobs 3 and 4 is accommodated inside the handle 2. As shown by the imaginary line, the handle 2 is foldably connected to the main body case 1.

The blower unit in the main body case 1 includes a motor case 5, a motor 7 and a fan 6 assembled to the motor case 5, and a heater 9 spirally wound around an insulating frame 8 assembled in a cross shape. The fan 6 is driven to rotate in one direction, pressurizes the air sucked from the suction port 10 at the rear end of the main body case 1, and blows out the air port 11 of the wind conductor 1A at the front end. As will be described later, the fan 6 also serves as a blower for sending out the ions generated by the ion generating means as far as possible from the outlet 11.

イ オ ン Ion generating means is incorporated in the main body case 1 in order to blow negative ions together with the air flow generated by the fan 6 onto the hair. In FIG. 3, the ion generating means includes a rectifier circuit 13 for half-wave rectifying a current from a commercial power supply (100 V), a pulse generating circuit 14 for converting the rectified current into a pulse current, and a pulse current of, for example, 4 kV. It comprises a transformer 15 for boosting the voltage, a discharge device 16, a diode 17 provided between the transformer 15 and the discharge device 16, and the like. The rectifier circuit 13 and the pulse generation circuit 14 are mounted on a circuit board 18, and the circuit board 18 and the step-up transformer 15 are arranged in a space formed by cutting out the insulating frame 8 for the heater 9, and Reference numeral 16 is incorporated in the wind conductor 1A.

In FIGS. 4 to 6, a rectifying tube 20 and a blowout grill 21 are incorporated inside the wind conductor 1 </ b> A, and the discharge device 16 is supported by the rectifying tube 20 so that the air flow generated by the fan 6 is substantially reduced. The discharge device 16 is held at the center. The rectifying cylinder 20 has a cylindrical wall having a circular cross section, and is formed of a plastic molded product in which a rectifying wing 22 radially provided at an inner front end thereof and an air guide cylinder 23 provided at the center of the cylindrical wall are integrally formed. After the outlet grill 21 is fitted inside the wind conductor 1A, the rectifying cylinder 20 is fixed inside the wind conductor 1A, so that these three members can be handled as one unit component. The rectifying vanes 22 rectify the swirling airflow generated by the fan 6 into a linear airflow.

In FIG. 1, the baffle tube 23 is formed by a tapered first cylindrical portion 24 and a second cylindrical portion 25 that continuously projects forward from a small-diameter end on the front side of the first cylindrical portion 24. In addition, the discharge device 16 is incorporated in the first cylindrical portion 24. The front end of the second cylindrical portion 25 projects outward from the opening surfaces of the outlet grille 21 and the outlet 11 in a state where the front end is located at the center of the outlet 11 of the wind conductor 1A. Reference numeral 26 denotes an inlet on the rear side of the baffle 23, and 27 denotes an outlet on the front side of the baffle 23.

In FIG. 1, the discharge device 16 includes an electrode holder 29, a center electrode 30 fixed to a front center portion of the electrode holder 29, a counter electrode 31 surrounding the center electrode 30, and a central electrode 30 and a counter electrode 31. And a dielectric part 32 that insulates and blocks the space between them. The electrode holder 29 has a multi-stage shaft-shaped boss portion 33, a radial holding arm 34 provided on the outer periphery of the boss portion 33, and a cylindrical tube wall 35 for tightly fitting the ring-shaped counter electrode 31. And a central electrode support portion 38 for fixing and supporting the rod-shaped central electrode 30 having a sharp tip from the periphery. As a molding material for the electrode holder 29, an insulating plastic material which is not a conductive plastic can be used. However, in view of the dielectric properties of the cylindrical wall 35, a plastic material having excellent dielectric properties, and having ozone resistance and heat resistance, for example, Polyphenylene sulfide (PPS), polybutylene terephthalate (PBT), polyethylene (PE) and the like are preferable. A cylindrical wall 35 for supporting the counter electrode 31 is formed on the front side of the boss 33, and an escape recess 36 is formed on the rear side. The electrode holder 29 can be positioned and fixed to the rectifying cylinder 20 by fitting and fixing the holding arm 34 into the concave portion 37 provided on the inner surface of the first cylindrical section 24.

The center electrode 30 includes a discharge needle 40 formed of tungsten having a small discharge resistance, and a positioning boss 41 press-fitted and fixed to the rear end of the discharge needle 40. I have. The center electrode 30 is inserted or press-fitted into the mounting hole at the center of the electrode holder 29 (in any case, the discharge needle 40 is in close contact with the mounting hole). In a state where 40 is positioned on the central axis of the electrode holder 29, it can be fixed firmly. The fixing portion of the discharge needle 40 is a middle portion of a mounting hole formed in the center electrode support portion 38 and a rear end portion of the discharge needle 40 fixed by the boss 41, and a free end side (a free end side projecting from a front end of the fixing portion). It is configured to be sufficiently longer than the length of the discharge section 42). Therefore, the effect of preventing the center electrode 30 from wobbling is high, and the positional relationship among the three members of the center electrode 30, the dielectric 32, and the counter electrode 31 can be properly determined. In particular, since the middle of the discharge needle 40 is fixedly supported by the central electrode support 38 integrally formed with the cylindrical wall 35 which is the support of the counter electrode 31 also serving as the dielectric, the conventional assembly is achieved. Time error is small, and proper positioning is possible. In FIG. 5, the counter electrode 31 is formed of a press fitting made of a thin plate made of copper or iron, and has a ring-shaped electrode portion 43 having one part of a peripheral surface cut off, and a rearward direction from a rear edge of the electrode portion 43. Four extending mounting legs 44 are integrally provided. The electrode portion 43 is externally fitted to the cylindrical wall 35 having a circular cross section of the electrode holder 29, and the attachment leg 44 is bent and fixed to the peripheral step of the electrode holder 29, so that the electrode portion 43 is fixed to the center electrode 30. It can be fixed in a state of being positioned concentrically. In this mounting state, the front ends of both electrodes 30 and 31 are located on the same plane. Specifically, the discharge portion 42 at the front end of the center electrode 30 and the discharge edge surface 45 at the front end of the counter electrode 31 are located on a plane including the front opening surface of the cylindrical wall 35 and orthogonal to the center axis of the center electrode 30. (See FIG. 1).

The dielectric portion 32 includes a dielectric cylinder 46 that insulates and blocks the spark discharge between the center electrode 30 and the counter electrode 31 so as not to occur, and a cylindrical cylinder wall 35 that externally supports the cylindrical counter electrode 31. It is composed of The dielectric cylinder 46 is formed of an inorganic insulating (dielectric) material having high insulation properties and heat resistance, such as mica, glass, and ceramics, and is formed in a cylindrical shape. When mica is used as a material, natural mica is used in the form of powder and molded into a cylindrical shape. As the glass, crystallized glass, quartz glass, borosilicate glass, or the like having excellent heat resistance is preferable. When ceramics are used as the material, a material obtained by firing a powder containing silicate, alumina, zirconia, steatite, barium titanate or the like as a main raw material to form a cylinder is used. If ceramics is used as the dielectric cylinder 46, in addition to an insulation blocking effect of preventing movement of electrons, far infrared rays are radiated when applied to a hot air device such as a dryer, so that an effect of improving hair drying can be expected, and A therapeutic effect on the body can also be expected.

The rear end of the dielectric cylinder 46 is fitted and fixed to the inner surface of the cylinder wall 35 to be integrated with the electrode holder 29. In this fixed state, the counter electrode 31 and the dielectric cylinder 46 are centered on the center electrode 30. The front cylinder end of the dielectric cylinder 46 faces the front end portion of the first cylinder 24 and forms an orifice portion R between the dielectric cylinder 46 and the first cylinder 24. ing. In order to prevent irregular discharge from occurring between the center electrode 30 and the counter electrode 31 and to effectively generate negative ions, the dielectric cylinder 46 protrudes largely forward from the discharge portion 42 of the center electrode 30. . As shown in FIG. 1, the center electrode 30 and the transformer 15 and the counter electrode 31 and the transformer 15 are respectively connected by lead wires 47. In order to prevent a spark from being generated between the portions where the lead wires 47 are soldered. The central electrode 30 and the lead wire 47 are housed in the escape recess 36 behind the boss 33 and are sealed with an insulating sealing material 48 filling the recess 36. As a sealing material, an insulating adhesive such as silicon can be used.

According to the discharge device 16 having the above configuration, of the high voltage boosted by the transformer 15, only the negative current passing through the diode 17 is applied to the center electrode 30, so that electrons are emitted from the center electrode 30 to the counter electrode 31. It discharges oxygen, minute water droplets, dust and the like in the air to make it negatively charged and negatively ionized. The negative ions generated by the discharge device 16 are blown forward from the outlet 27 through the second tube portion 25 by the airflow introduced into the air guide tube 23. At this time, when the air flow introduced into the air guide tube 23 passes through the orifice portion R having a smaller passage cross-sectional area, the flow velocity increases and the pressure decreases. Therefore, the negative ions and ozone floating around the electrodes 30 and 31 are sucked by the airflow passing through the orifice portion R and quickly sent to the second cylindrical portion 25. Therefore, ions floating near the tip of the dielectric cylinder 28 and going to the counter electrode 31 are prevented from being adsorbed by the counter electrode 31 and neutralized and disappear, thereby forming an ion stream with a high distribution density. it can.

Since the negative ions can be supplied to the outlet 11 in a state of being sealed in the air guide tube 23, the negative ions diffuse into the main airflow passing through the wind guide between the discharge device 16 and the outlet 11. In addition, the distribution density can be prevented from lowering, and the negative ions can be reliably prevented from contacting the surface of components such as the case and the blowout grill 21 incorporated in the air guide portion and electrically neutralizing them. Further, since the outlet 27 of the air guide tube 23 is located at the center of the outlet 11 and projects forward from the opening surface of the outlet 11, the negative ions emitted from the outlet 27 of the air guide tube 23 are: The hair can reliably reach the hair while being wrapped in the center of the airflow blown out from the blowout opening 11. A straightening vane 22 is provided immediately before the outlet 11 to prevent the main flow of air blown from the outlet 11 from turning, so that negative ions from the air guide tube 23 diffuse into the main airflow. And the amount of negative ions reaching the hair can be improved.

で は In a hair dryer, as shown in FIG. 8, a cylindrical nozzle 50 may be added to the outlet 11 of the wind conductor 1 </ b> A, as needed, so as to be tapered. An inner cylinder 51 is fixed to the inner surface of the nozzle 50. A leaf-shaped straightening vane 52 (see FIG. 9) is provided on the inner surface of the inner cylinder 50, and a holding boss 53 facing forward and backward is integrally formed at a central portion thereof. A passage tube 54 is fitted inside the holding boss 53, and when the nozzle 50 is attached to the outlet 11 of the wind conductor 1 </ b> A, the passage tube 54 is adjacent to the outlet 27 of the The negative ions coming out of the wind cylinder 23 are guided to move to the center of the opening surface of the outlet 55 of the nozzle 50. As described above, when the negative ions are transferred and guided to the opening surface of the outlet 55 by the passage cylinder 54 provided on the nozzle 50 side, the negative ions are prevented from diffusing into the main airflow passing through the inside of the nozzle, The negative ions can be effectively delivered to the hair in a state where the distribution density is high.

FIG. 10 shows another embodiment of the discharge device. In the boss portion 33 of the electrode holder 29, a wind guide passage 56 is formed from the rear end of the boss portion 33 toward the inside of the discharge space S surrounded by the dielectric cylinder 46, and the air flow generated by the fan 6 is passed through the wind guide passage. It can be directly introduced into the discharge space S via 56. In this case, as shown by the imaginary line in FIG. 10, a tapered guide cylinder 57 is provided at the rear of the electrode holder 29 so that a part of the air flow generated by the fan 6 is discharged to the discharge space S. It can be introduced efficiently. As described above, when the air flow generated by the fan 6 is directly introduced into the discharge space S through the wind guide passage 56, ions and ozone floating in the discharge space S are forced out of the discharge space S by being carried on the air flow. And ozone floating near the discharge space S can be prevented from being neutralized and eliminated by being adsorbed to the counter electrode 31 or the center electrode 30.

FIG. 11 shows another embodiment of the fixing structure of the center electrode 30. In FIG. 11A, a sealing material in which the central electrode 30 is formed only by the discharge needles 40, the discharge needles 40 are press-fitted into mounting holes provided in the central electrode support portion 38, and the rear end of the needles escapes to fill the concave portions 36. By solidifying at 48, the discharge needles 40 can be firmly fixed as long as they are positioned with respect to the electrode holder 29. Also in this case, similarly to the previous embodiment, the length of the fixed portion of the discharge needle 40 is configured to be sufficiently longer than the length of the free end side (discharge portion 42 side) protruding from the front end of the fixed portion. It is possible to reliably prevent the wobble of 40, and to properly position the three members of the center electrode 30, the dielectric 32, and the counter electrode 31. In addition, since the center electrode support 38 is formed integrally with the cylindrical wall 35, which is a support for the counter electrode 31 also serving as the dielectric, there is little error during assembly, and proper positioning is possible. . In addition, the discharge needle 40 may be insert-molded in the electrode holder. In FIG. 11B, the center electrode 30 is composed of the discharge needle 40 and the positioning boss 41 fixed to the rear end of the discharge needle 40 as in the previous embodiment. The through hole is formed larger than the diameter of the discharge needle 40, and the positioning and the fixing of the center electrode 30 are performed by fitting the positioning boss 41 into the mounting hole.

FIG. 12 shows another embodiment of the discharge device. In this case, the air guide tube 23 is formed as a straight tube, the front portion of the dielectric tube 46 is formed to have a tapered cylindrical shape that expands forward, and an orifice portion R is provided between the protruding end of the dielectric tube 46 and the air guide tube 23. Was formed. As described above, the orifice portion R may be formed between the air guide tube 23 and the dielectric tube 46, and if necessary, another piece may be provided on the inner surface of the air guide tube 23 or the outer surface of the dielectric tube 46. The orifice portion R can be formed by assembling.

In addition to the above-described embodiment, the center electrode 30 does not need to be needle-shaped, and may be formed in a thin cylindrical shape. 42 can be formed. The distal end of the discharge unit 42 can be projected forward from the opening surface of the cylindrical wall 35. In addition to forming the counter electrode 31 in a cylindrical shape, the counter electrode 31 may be formed by bending a wire into a ring shape or in a rectangular tube shape. In this case, the cylindrical wall 35 can be formed in a rectangular cylindrical shape, and the opposing electrode 31 can be fitted in a close contact state. As a matter of course, the rectangular cylindrical opposing electrode 31 may be closely fitted to the cylindrical cylindrical wall 35. If necessary, the counter electrode 31 may have a circular cross section or a semicircular cross section. Similarly, the dielectric cylinder 46 does not need to be a cylinder, and can be formed in a rectangular cylinder shape. The discharge portion 42 at the front end of the center electrode 30 and the discharge edge surface 45 at the front end of the counter electrode 31 need not necessarily be located on a plane orthogonal to the center axis of the center electrode 30. For example, the discharge part 42 can be located behind the opening surface of the cylindrical wall 35.

誘 電 The cylindrical wall 35 can be made to protrude to the same length as the dielectric cylindrical body 46, and the dielectric portion 32 can be formed only by the cylindrical wall 35. The electrode holder 29 can be composed of two molded bodies. In this case, the three electrodes 30 and 31 and the dielectric part 32 can be positioned and fixed by sandwiching the divided molded bodies. The discharge device can be used to generate positive ions and ozone in addition to negative ions, and can be used to generate negative ions and positive ions alternately if necessary. The discharge device of the present invention can be incorporated in a hot air supply device such as a hand dryer, a hair blower, a foot dryer, or a fan, and can be used in a clean room to be used as a dust collector.

It is a longitudinal section of a discharge device. It is the whole longitudinal section side view of a hair dryer. It is a conceptual diagram explaining the outline of an ion generating means. It is a longitudinal section of an ion generating part in a hair dryer. FIG. 4 is an exploded perspective view illustrating a relational structure between a rectifying cylinder and an ion generation unit. It is an exploded perspective view of a wind conductor and a nozzle. FIG. 5 is a sectional view taken along line AA in FIG. 4. It is a vertical side view which shows the use condition of a nozzle. It is a front view of a nozzle. It is sectional drawing which shows another Example of a discharge device. It is sectional drawing which shows another Example of the fixing structure of a center electrode. It is sectional drawing which shows another Example of a discharge device.

Explanation of reference numerals

REFERENCE SIGNS LIST 1 body case 6 fan 16 discharge device 23 air guide tube 24 first tube portion of wind guide tube 25 second tube portion of wind guide tube 29 electrode holder 30 center electrode 31 counter electrode 32 dielectric portion 35 wall of electrode holder 36 Escape recess 38 Central electrode support portion 42 Discharge portion of central electrode 45 Discharge edge surface of counter electrode 46 Dielectric cylinder 47 Lead wire 48 Sealing material

Claims (3)

A discharge device in which a center electrode 30 and a counter electrode 31 are fixed to an electrode holder 29,
A central electrode support portion 38 is formed at the front central portion of the electrode holder 29, and a cylindrical wall 35 is formed around the central electrode support portion 38 by integral molding.
A ring-shaped counter electrode 31 externally fitted and fixed to the cylindrical wall 35 is arranged concentrically around the central electrode 30 fixed to the central electrode support portion 38,
The center electrode 30 and the counter electrode 31 are connected to a power supply lead wire 47 on one side of the electrode holder 29, respectively.
A discharge device wherein a connection portion between a center electrode 30 and a lead wire 47 is accommodated in an escape recess 36 provided in an electrode holder 29 and sealed with a sealing material 48 filled in the escape recess 36. A discharge device in which a center electrode 30 and a counter electrode 31 are fixed to an electrode holder 29,
A central electrode support portion 38 is formed at the front central portion of the electrode holder 29, and a cylindrical wall 35 is formed around the central electrode support portion 38 by integral molding.
The central electrode 30 is fixed to the central electrode support portion 38, and the counter electrode 31 is externally fixed to the cylindrical wall 35,
The counter electrode 31 integrally includes a ring-shaped electrode portion 43 and a mounting leg 44 extending rearward from a rear edge of the electrode portion 43,
A discharge device characterized in that the electrode portion 43 is positioned concentrically with respect to the center electrode 30 by bending and fixing the mounting leg 44 to the electrode holder 29. A discharge device in which a center electrode 30 and a counter electrode 31 are fixed to an electrode holder 29,
A central electrode support portion 38 is formed at the front central portion of the electrode holder 29, and a cylindrical wall 35 is formed around the central electrode support portion 38 by integral molding.
A ring-shaped counter electrode 31 externally fitted and fixed to the cylindrical wall 35 is arranged concentrically around the central electrode 30 fixed to the central electrode support portion 38,
The discharge needle 40 constituting the central electrode 30 is inserted or press-fitted into a mounting hole at the center of the electrode holder 29 and fixed.
A discharge device, wherein a length of a fixed portion of the discharge needle 40 is longer than a length of a free end side of the discharge needle 40.

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