EP0158202A1 - Appareil de production d'ions positifs et/ou négatifs - Google Patents

Appareil de production d'ions positifs et/ou négatifs Download PDF

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Publication number
EP0158202A1
EP0158202A1 EP85103468A EP85103468A EP0158202A1 EP 0158202 A1 EP0158202 A1 EP 0158202A1 EP 85103468 A EP85103468 A EP 85103468A EP 85103468 A EP85103468 A EP 85103468A EP 0158202 A1 EP0158202 A1 EP 0158202A1
Authority
EP
European Patent Office
Prior art keywords
ionizer
voltage
discharge
capacitor
discharge circuit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP85103468A
Other languages
German (de)
English (en)
Inventor
Hermann Dipl.-Ing. Brennecke
Horst Dipl.-Ing. Liere
Michael Dipl.-Ing. Grad. Kiesl
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
I R S Industrie-Rationalisierungs-Systeme GmbH
Original Assignee
I R S Industrie-Rationalisierungs-Systeme GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by I R S Industrie-Rationalisierungs-Systeme GmbH filed Critical I R S Industrie-Rationalisierungs-Systeme GmbH
Publication of EP0158202A1 publication Critical patent/EP0158202A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
    • H01T23/00—Apparatus for generating ions to be introduced into non-enclosed gases, e.g. into the atmosphere
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S323/00—Electricity: power supply or regulation systems
    • Y10S323/903—Precipitators

Definitions

  • the invention relates to a device for generating positive and / or negative ions by means of a high-voltage ionizer operating with an influential discharge, the high-voltage conductor of which is insulated from the surroundings while its tip electrodes are grounded.
  • spray devices with a protruding high-voltage electrode have been used for electrostatic coating with liquid paints, powders or flakes. It forms an electric field, along the field lines of which the coating material flies to the workpiece through electrostatic forces.
  • the first object of the present invention is to eliminate this disadvantage.
  • Non-contact high-voltage ionizers with the features of the preamble are known from US Pat. No. 3,369,152, their use for electrostatic spray coating by US Pat. No. 4,042,971. These are ionizers that are operated with AC voltage. As a result, the ions generated at the tips of the grounded electrodes are alternately positively and negatively charged. Recombination neutralizes many of the positive ions with the negative or vice versa. This affects the ion yield, as does the spatial range of the ionization.
  • DC voltage ionizers are also known, in which ions of the same charge are formed.
  • the tip electrodes which are freely accessible from the outside, must be connected to high voltage, so that there are problems with protection against accidental contact and the risk of flashovers. These ionizers are completely excluded in potentially explosive systems.
  • the object of the present invention is to improve a high-voltage ionizer of the type described at the outset, that is to say with grounded tip electrodes, in such a way that the above-described recombination of the ions formed is excluded.
  • the ionizer should be suitable for charging coating material without the formation of an electric field between the ionizer and the workpiece.
  • the insulated conductor of the ionizer is connected, on the one hand, via a diode to a switchable discharge circuit of its capacitor, which can be charged with a certain polarity, and on the other hand, the insulated conductor is grounded via a discharge resistor.
  • the capacitor which can be charged with a constant polarity, first ensures that the discharge current in the ionizer always produces ions of the same polarity.
  • the insulated conductor of the ionizer is connected to the discharge circuit of the capacitor via a diode.
  • the expected resonant circuit behavior between the ionizer and the discharge circuit is excluded, that is, in the negative phase (backflow of the charge), ions of the opposite sign cannot be generated in the ionizer, which contribute to the recombination would.
  • the stored charge can therefore not flow back into the discharge circuit of the capacitor, but is dissipated through the discharge resistance of the insulating conductor in order to enable a new charge current pulse into the ionizer.
  • the ionizer is exposed to a high charge current and a low discharge current.
  • the discharge takes place ten times, a hundred times or a thousand times slower than the charge, so that practically no opposite polar ions are generated.
  • a certain amount of same-pole ions is formed in front of the insulated conductor and the subsequent, same-pole ion replenishment repels this existing cloud of ions and thus away from the tip electrodes. It is therefore advisable to work with the highest possible pulse frequency, especially above 100 Hz.
  • the charge pulse is then only present for a very short time and a resistor with a low power value is sufficient for the discharge resistor at the ionizer.
  • the ionizer can be safely installed in spray devices, so that the coating material is charged inside the spray device and the electrodes, which were previously necessary at the spray gun outlet, are no longer required. An electrical field to the workpiece with the undesirable cage effect cannot therefore develop.
  • the discharge circuit contains the one winding of a high-voltage transformer, the other winding of which lies in the connecting line of the ionizer.
  • This has the advantage that the discharge circuit can be operated at low voltage and only the connecting lead of the ionizer itself is under high voltage. This makes the cabling of the system much cheaper.
  • a thyristor-controlled pulse generator with oscillator is recommended for supplying the capacitor to be used, which after reaching a predetermined target voltage on the capacitor interrupts its connection to the generator and closes an interrupter in the discharge circuit.
  • a monitoring and control unit can be connected to the pulse generator so that any short circuits or impermissibly high currents or voltages are immediately recognized and lead to the system being switched off.
  • the ionizer denoted by 1 consists of a conductor 2 which is insulated from the surroundings and which surrounds a series of tip electrodes 3 which project upwards.
  • the conductor 2 is connected to high voltage between 50 and 150 kV, the tip electrodes 3 are connected to earth.
  • other designs can also be used for the design of the ionizer, for example according to DE-PS 25 36 091.
  • the conductor 2 is grounded on the one hand via a discharge resistor 4, and on the other hand connected to the discharge circuit of a capacitor 7 via a diode 5 and a high-voltage transformer 6.
  • a diode 5 is connected to the discharge circuit of a capacitor 7 via a diode 5 and a high-voltage transformer 6.
  • an interrupter switch 8 is installed in the discharge circuit. It is controlled by the falling edge of the discharge pulse of the capacitor 7.
  • the capacitor 7 Since the capacitor 7 is generally connected to AC voltage, it is preceded by a diode 9. It ensures that the charging of the capacitor always takes place with constant polarity and accordingly the ionizer 1 only generates ions of the same polarity.
  • the block diagram shown in FIG. 2 shows the structure of the pulse generator for feeding the capacitor 7.
  • the circuit consists of a transformer 10. (if necessary with a rectifier), an oscillator 11, a current / voltage control unit 12, a working commutation 13, a pause commutation 14 and a current / voltage measuring element 15.
  • the oscillator 11 which operates at a frequency of 10 to 300 Hz, expediently more than 100 Hz, closes to charge the capacitor, the switch of the working commutation 13. This charges the capacitor 7. If the target voltage at the capacitor has been determined via the measuring element 15, the current supply via the switching element 13 is interrupted and the downstream external commutation 14 is closed. Thereby, the voltage drops between the conductors A and B to zero, and this voltage drop in front of the diode 9 controls the switch 8, by closing this switch when the voltage in front of the diode 9 lie close to zero f t. The capacitor 7 can thus discharge, the discharge current in the high-voltage transformer 6 and thus in the conductor 2 of the ionizer 1 generating the desired high-voltage pulse. If the pulse strength has decreased to a predetermined value, the switch 8 and the external commutation 14 are opened again by known electronic control means, the working commutation 13 is closed and the process is repeated.
  • both positive and negative ions have to be applied to the workpieces to be unloaded, it is advisable to use two appropriately polarized ionizers, but at such a distance that their ion clouds do not overlap, but only meet in the area of the workpiece.
  • the Tip electrodes 3 are arranged in the flow channel of the coating material, so that the coating material is charged positively or negatively when it passes the ionizer.
  • the powder or droplet-shaped coating material then flies to the workpiece due to the electromagnetic attraction, possibly supported by compressed air. Since the tip electrodes are arranged inside the spray gun and thus cannot form an electric field with the workpiece to be coated, the cage effect described above cannot occur. It is therefore irrelevant whether outer surfaces or cavities are to be coated.
  • the invention has the advantage that paired neutralization of oppositely charged coating particles can no longer occur.

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  • Elimination Of Static Electricity (AREA)
EP85103468A 1984-04-04 1985-03-23 Appareil de production d'ions positifs et/ou négatifs Withdrawn EP0158202A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3412563 1984-04-04
DE19843412563 DE3412563A1 (de) 1984-04-04 1984-04-04 Vorrichtung zur neutralisation aufgeladener werkstuecke

Publications (1)

Publication Number Publication Date
EP0158202A1 true EP0158202A1 (fr) 1985-10-16

Family

ID=6232591

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85103468A Withdrawn EP0158202A1 (fr) 1984-04-04 1985-03-23 Appareil de production d'ions positifs et/ou négatifs

Country Status (3)

Country Link
US (1) US4638398A (fr)
EP (1) EP0158202A1 (fr)
DE (1) DE3412563A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1987004873A1 (fr) * 1986-02-06 1987-08-13 Sorbios Verfahrenstechnische Geräte Und Systeme Gm Dispositif de generation d'ions dans des courants de gaz

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3508968A1 (de) * 1984-04-04 1986-09-18 I R S Industrie Rationalisierungs Systeme GmbH, 6100 Darmstadt Vorrichtung zur erzeugung positiver und/oder negativer ionen
US5447763A (en) * 1990-08-17 1995-09-05 Ion Systems, Inc. Silicon ion emitter electrodes
US5179497A (en) * 1991-04-25 1993-01-12 Bakhoum Ezzat G Ground-free static charge removal device
WO1992020201A1 (fr) * 1991-04-25 1992-11-12 Bakhoum Ezzat G Dispositif de decharge d'electricite statique non relie a la terre

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4232355A (en) * 1979-01-08 1980-11-04 Santek, Inc. Ionization voltage source
US4333123A (en) * 1980-03-31 1982-06-01 Consan Pacific Incorporated Antistatic equipment employing positive and negative ion sources
GB2102214A (en) * 1981-05-16 1983-01-26 Sidha Technology Ltd Air ionization apparatus

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE667169A (fr) * 1964-07-21
CH524112A (de) * 1971-05-29 1972-06-15 Multorgan S A Verfahren zur Erzeugung von Luftionen
US4042971A (en) * 1974-09-30 1977-08-16 Hermann Brennecke Electrostatic charge neutralization
US4107757A (en) * 1977-06-30 1978-08-15 Senichi Masuda Pulse power source
DE2822228A1 (de) * 1978-05-22 1979-11-29 Kigass Engineering Ltd Anti-statik-einrichtung
DE2902425A1 (de) * 1979-01-23 1980-07-31 Haug Gmbh & Co Kg Vorrichtung zur beseitigung elektrostatischer ladungen
US4542434A (en) * 1984-02-17 1985-09-17 Ion Systems, Inc. Method and apparatus for sequenced bipolar air ionization

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4232355A (en) * 1979-01-08 1980-11-04 Santek, Inc. Ionization voltage source
US4333123A (en) * 1980-03-31 1982-06-01 Consan Pacific Incorporated Antistatic equipment employing positive and negative ion sources
GB2102214A (en) * 1981-05-16 1983-01-26 Sidha Technology Ltd Air ionization apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1987004873A1 (fr) * 1986-02-06 1987-08-13 Sorbios Verfahrenstechnische Geräte Und Systeme Gm Dispositif de generation d'ions dans des courants de gaz

Also Published As

Publication number Publication date
US4638398A (en) 1987-01-20
DE3412563C2 (fr) 1989-09-07
DE3412563A1 (de) 1985-10-17

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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AK Designated contracting states

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17P Request for examination filed

Effective date: 19850918

17Q First examination report despatched

Effective date: 19870219

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18W Application withdrawn

Withdrawal date: 19870930

RIN1 Information on inventor provided before grant (corrected)

Inventor name: KIESL, MICHAEL, DIPL.-ING. GRAD.

Inventor name: LIERE, HORST, DIPL.-ING.

Inventor name: BRENNECKE, HERMANN, DIPL.-ING.