EP0163389A2 - Sprühgerät - Google Patents

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Publication number
EP0163389A2
EP0163389A2 EP85302347A EP85302347A EP0163389A2 EP 0163389 A2 EP0163389 A2 EP 0163389A2 EP 85302347 A EP85302347 A EP 85302347A EP 85302347 A EP85302347 A EP 85302347A EP 0163389 A2 EP0163389 A2 EP 0163389A2
Authority
EP
European Patent Office
Prior art keywords
capacitor
high voltage
generator
gas
discharge tube
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.)
Ceased
Application number
EP85302347A
Other languages
English (en)
French (fr)
Other versions
EP0163389A3 (de
Inventor
Alan James Norris
Colin Grant Mclaine
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.)
Imperial Chemical Industries Ltd
Original Assignee
Imperial Chemical Industries Ltd
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 Imperial Chemical Industries Ltd filed Critical Imperial Chemical Industries Ltd
Publication of EP0163389A2 publication Critical patent/EP0163389A2/de
Publication of EP0163389A3 publication Critical patent/EP0163389A3/de
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
    • B05B5/025—Discharge apparatus, e.g. electrostatic spray guns
    • B05B5/053—Arrangements for supplying power, e.g. charging power
    • B05B5/0531—Power generators

Definitions

  • This invention relates to portable apparatus for electrostatic spraying of a liquid and in particular to apparatus having a hand-held member from which the liquid is electrostatically sprayed, the high voltage required to effect the electrostatic atomisation of the liquid being provided by a battery powered high voltage generator. Examples of such spraying apparatus are described in US-A-4356528 and in EP-A-118202, EP-A-120633 and EP-A-132062.
  • a suitable manual switch e.g. a trigger switch mounted on the hand-held member
  • a suitable light source eog. a light-emitting diode (LED) or a buzzer in the low voltage battery circuit
  • LED light-emitting diode
  • a buzzer in the low voltage battery circuit
  • such components may impose a signic- ant current drain on the batteries if actuated continuously while the power to the generator is on or, if connected in series with the supply to the generator, may necessitate the use of a higher voltage battery, or an additional cell in a train of batteries.
  • the use of such a lamp, LED, or buzzer also necessitates the use of an additional component which adds to the cost of the apparatus.
  • the indication is by light derived from a component forming an essential integer of the high voltage generator: by the term essential integer we mean an integer, that if omitted, would prevent the generator from working.
  • an input stage includes an oscillator powered by the battery or batteries. The output of this oscillator is fed, via a step-up transformer, to an intermediate stage wherein the varying input current from the step-up transformer is rectified and used to charge a capacitor, typically to a peak voltage in the range 100 to 400 V
  • This intermediate stage includes a triggering device which discharges the capacitor, through the primary of a second step-up transformer, when the voltage across the triggering device reaches a predetermined value.
  • the pulses of current through the primary of the second step-up transformer produce high voltage pulses in the secondary thereof which forms part of the output stage of the generator.
  • the triggering device is a gas-gap discharge device: when such devices conduct, light is emitted.
  • a light emitting component forms an essential integer of the generator.
  • the light emitted from this light-emitting component is employed to provide a visual indication of the operation of the generator.
  • the frequency with which the high voltage pulses are produced in order to maintain a high voltage sufficient to effect electrostatic atomisation of the liquid, the frequency with which the high voltage pulses are produced, and: hence the frequency with which the triggering device in the intermediate stage actuates, will generally be too high (often of the order of 10 - 50 Hz or more) to produce signals that can conveniently be counted by the operator.
  • the indication is given by pulses of current flowing through an audible or visible signal emitting component driven by, or forming an integer of, an ancillary oscillator operating, when the power supply to the high voltage generator is switched on, at a suitable low frequency; for ease of counting the signals, their frequency, and hence the frequency of the ancillary oscillator, should be within the range 0.2 to 4 Bz, preferably within the range 0.3 to 2 Hz.
  • timing signals are produced, it will be appreciated that it is not essential to provide an additional indication that the high voltage generator is operative and so there need not be a signal-emitting component as an essential integer of the high voltage generating circuit.
  • triggering devices other than gas-gap discharge devices can be employed in the production of high voltage pulses or, where such a light-emitting component is an essential integer of the high voltage generating circuit, the light emitted therefrom need not be visible to the user.
  • the present invention provides electrostatic spraying apparatus having a hand-held member from which the liquid is electrostatically sprayed, said member incorporating
  • the apparatus comprises an elongated member, having a handle portion 2 and a sprayhead assembly 3 comprising a sleeve 4 in which a cartridge 5 containing the liquid to be sprayed is inserted.
  • the cartridge 5 has a mechanically actuated valve (not shown) and a nozzle 6 (see Figure 3) to which a high voltage can be applied.
  • the cartridge valve When the cartridge valve is open and a high voltage is applied to the nozzle 6, the liquid is electrostatically atomised as a spray through an orifice 7 at the lower end of sprayhead assembly 3.
  • an annular conductor 8 constituting a field adjusting electrode e.g. as described in aforesaid US-A-4356528.
  • the elongated member 1 comprises a casing formed by two shell mouldings 9, 10 of an electrically insulating plastics material.
  • Figure 2 the handle portion 2 of the elongated member 1 is shown with the handle end of shell moulding 9 removed.
  • a compartment 11 for receipt of a series train of two dry cell batteries 12; a high voltage generator assembly 13; and a trigger assembly 14.
  • the generator assembly 13 comprises a printed circuit board 15 on which are mounted the various components shown in Figure 3 as enclosed within the dotted box. For simplicity however the only one of those components shown in Figure 2 is a gas-gap discharge tube 16. Board 15 is mounted in a moulding 17 of transparent or translucent electrically insulating plastics material. Also mounted in moulding 17 is the output step-up transformer 18 which is connected to board 15 by leads 19, 20. The high voltage output from transformer .18 is fed, via a high voltage diode 21, to a high voltage lead 22 via a contact within sleeve 23 attached to transformer 18 and thence, by lead 22 to nozzle 6.
  • the generator assembly 13 is located by projections 24, 25, 26 and 27 integral with shell moulding 10 and by corresponding projections (not shown) in moulding 9.
  • Wire 30 also serves to connect the negative contact of the battery train to the trigger assembly 14.
  • the trigger assembly 14 comprises a trigger lever 32 made of an electrically conductive plastics material pivotally mounted on bosses 33 in mouldings 9 and 10.
  • the free end of wire 30 from the battery compartment extends through a hole in lever 32 to form a contact pin 34.
  • a pin 35 formed from an electrically insulating material. Pin 35 engages with the spring contact strip 28 from board 15 to hold the strip 28 out of engagement with pin 34 when the trigger lever 32 is in the "off” position.
  • Strip contact 28 is laterally spaced from lever 32, and hence insulated therefrom when the trigger is in the "off” position. Rotation of lever 32 from the "off” position causes the contact pin 34 to engage with strip contact 28 thus completing the circuit to supply power from the batteries 12 to the generator.
  • Hooked round an extension 36 to trigger lever 32 is a stiff wire 37 which extends through the casing of elongated member 1 to actuate the valve on the cartridge 5 and to make electrical contact with the field adjusting electrode 80
  • the operator's finger contacting trigger lever 32 provides a connection, through the operator, to earth thus earthing the field adjusting electrode 8 and the negative side of the battery train.
  • a return spring (not shown) is provided to bias the trigger lever 32 to the "off" position.
  • Cover 38 Access to the battery compartment 11 is provided by a cover 38 of moulded electrically insulating plastics material.
  • Cover 38 is shown in section in Figure 2. One end of cover 38 is located in a slot 39 in mouldings 9 and 10 while the other end has a latch 40 to engage with a rib 41 on the end of mouldings 9, 10.
  • Cover 38 is provided with an integral hinge 42 to permit the cover to be opened, upon disengagement of latch 40 from rib 41, to allow replacement of the batteries 12.
  • An opening 43 is provided in the mouldings 9, 10 to expose the part of moulding 17 immediately above the gas-gap discharge tube 16.
  • the low voltage part of the high voltage generator circuit consists of a conventional transistorised saturation oscillator formed by the tapped primary 44 of a first step-up transformer 45 9 resistor 46 and a transistor 47. Typically this oscillator has a frequency of the order of 10 to 100 kHz.
  • the secondary of transformer 45 is connected, via a diode 48, to a capacitor 49. Connected in parallel with capacitor 49 is the gas-gap discharge tube 16 connected in series with the primary of the output step-up transformer 18. Shown dotted in the high voltage output circuit of Figure 3 is a capacitor 50. This capacitor is not a discrete component but represents the capacitance between the high voltage lead 22, the cartridge 5, and the nozzle 6 and the adjacent "earthed" components, eogo wire 37 and the field adjusting electrode 8.
  • the saturation oscillator gives rise to current pulses in the secondary of transformer 45 which charge capacitor 49 via diode 48.
  • the voltage across capacitor 49 reaches the striking voltage of gas-gap discharge tube 16
  • the latter conducts discharging capacitor 49 through the primary of output transformer 18, until the voltage across the gas-gap discharge tube falls to the extinguishing voltage.
  • the striking voltage is 150 - 250 V and the extinguishing voltage less than 10 V.
  • the discharge through tube 16 causes light to be emitted which is visible to the operator through the "window" in the elongated member .provided by the opening 43 in the mouldings 9, 10 and the transparent moulding 17 thereunder.
  • capacitor 49 The discharge of capacitor 49 through the primary of transformer 18 produces high voltage pulses in the secondary thereof: these high voltage pulses charge capacitor 50 via diode 21 and thus maintain a sufficiently high potential between nozzle 6 and the field intensifying electrode 8 for electrostatic atomisation of the liquid from nozzle 6.
  • the frequency with which gas-gap discharge tube 16 discharges capacitor 49 is typically 20 to 50 Hz and so, by virtue of persistence of vision, a continuous, or, possibly, flickering, light is visible to the operator through opening 43 to indicate the functioning of the generator.
  • a second diode 51 in series with a high resistance 52 and a capacitor 53.
  • a second gas-gap discharge tube 54 having a lower striking voltage than tube 16, is connected in parallel with capacitor 53.
  • the voltage across capacitor 53 reaches the striking voltage of gas-gap discharge tube 54, the latter conducts, discharging capacitor 53 to the threshold voltage of tube 54 and emitting a flash of light.
  • the striking and extinguishing voltages of tube 54, and the values of resistor 52 and capacitor 53 are selected, in relation to the characteristics of tube 16, to give flashes at suitable intervals, particularly at a frequency within the range 0.5 to 2Hz.
  • gas-gap discharge tube 54 is positioned beneath that part of moulding 17 adjacent opening 43 so that the periodic light flashes from tube 54 are visible to the operator as a timing aid.
  • tube 16 can be positioned remote from opening 43, or under a non-transparent portion of moulding 17, so that its light is not visible or merely provides a background illumination on to which the flashes from tube 54 are superimposedo
  • the light emitting components e.g. gas-gap discharge tubes
  • the light emitting components can be positioned remote from the "window" and the light transmitted to a position whereat it is visible to the operator by light pipe.
  • periodic signals could be produced by a separate ancillary low frequency oscillator in the low voltage, i.e. input, circuit driving a signal emitting component, e.g. a LED, or a piezo buzzer.
  • a signal emitting component e.g. a LED, or a piezo buzzer.

Landscapes

  • Electrostatic Spraying Apparatus (AREA)
  • Fertilizing (AREA)
  • Sowing (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Catching Or Destruction (AREA)
EP85302347A 1984-04-25 1985-04-03 Sprühgerät Ceased EP0163389A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8410519 1984-04-25
GB848410519A GB8410519D0 (en) 1984-04-25 1984-04-25 Spraying apparatus

Publications (2)

Publication Number Publication Date
EP0163389A2 true EP0163389A2 (de) 1985-12-04
EP0163389A3 EP0163389A3 (de) 1986-04-02

Family

ID=10560040

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85302347A Ceased EP0163389A3 (de) 1984-04-25 1985-04-03 Sprühgerät

Country Status (5)

Country Link
EP (1) EP0163389A3 (de)
JP (1) JPS60235665A (de)
AU (1) AU566042B2 (de)
CA (1) CA1239281A (de)
GB (1) GB8410519D0 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5411211A (en) * 1991-08-13 1995-05-02 Greene; Robert H. Spray gun
US5531384A (en) * 1992-06-18 1996-07-02 Greene; Robert H. Spray gun

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3212211A (en) * 1963-06-21 1965-10-19 Martha W Chapman Insecticidal application device
IE45426B1 (en) * 1976-07-15 1982-08-25 Ici Ltd Atomisation of liquids
CA1164521A (en) * 1978-03-19 1984-03-27 Yoshiyuki Takematsu Power supply arrangement for an optical apparatus
AU531759B2 (en) * 1978-04-17 1983-09-08 Ici Ltd. Electrostatic spraying
JPS5781246A (en) * 1980-11-10 1982-05-21 Olympus Optical Co Ltd Strobe device
US4530550A (en) * 1982-09-13 1985-07-23 Olympus Optical Company Ltd. Power supply unit for electronic flash
GB8305816D0 (en) * 1983-03-02 1983-04-07 Ici Plc Containers
DE3475598D1 (en) * 1983-03-25 1989-01-19 Ici Plc Spraying apparatus
DE3461353D1 (en) * 1983-07-15 1987-01-08 Ici Plc Electrostatic spraying

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5411211A (en) * 1991-08-13 1995-05-02 Greene; Robert H. Spray gun
US5531384A (en) * 1992-06-18 1996-07-02 Greene; Robert H. Spray gun

Also Published As

Publication number Publication date
GB8410519D0 (en) 1984-05-31
AU4129885A (en) 1985-10-31
AU566042B2 (en) 1987-10-08
EP0163389A3 (de) 1986-04-02
CA1239281A (en) 1988-07-19
JPS60235665A (ja) 1985-11-22

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Inventor name: NORRIS, ALAN JAMES

Inventor name: MCLAINE, COLIN GRANT