EP0123538A2 - Tête de pulvérisation électro-statique - Google Patents

Tête de pulvérisation électro-statique Download PDF

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Publication number
EP0123538A2
EP0123538A2 EP84302710A EP84302710A EP0123538A2 EP 0123538 A2 EP0123538 A2 EP 0123538A2 EP 84302710 A EP84302710 A EP 84302710A EP 84302710 A EP84302710 A EP 84302710A EP 0123538 A2 EP0123538 A2 EP 0123538A2
Authority
EP
European Patent Office
Prior art keywords
sprayhead
outer member
inner member
fluid
interior surface
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.)
Granted
Application number
EP84302710A
Other languages
German (de)
English (en)
Other versions
EP0123538A3 (en
EP0123538B1 (fr
Inventor
Edward Julius Bals
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to AT84302710T priority Critical patent/ATE33457T1/de
Publication of EP0123538A2 publication Critical patent/EP0123538A2/fr
Publication of EP0123538A3 publication Critical patent/EP0123538A3/en
Application granted granted Critical
Publication of EP0123538B1 publication Critical patent/EP0123538B1/fr
Expired 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
    • B05B5/0255—Discharge apparatus, e.g. electrostatic spray guns spraying and depositing by electrostatic forces only
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B15/00—Details of spraying plant or spraying apparatus not otherwise provided for; Accessories

Definitions

  • This invention relates to a sprayhead for the electrostatic spraying of fluid, in particular the electrostatic spraying of agricultural chemicals such as pesticides.
  • the object of the invention is to provide an improved sprayhead for increasing the degree of control of droplet formation and spray characteristics, as well as enhancing spray deposition, particularly with smaller spray droplets.
  • a sprayhead for the electrostatic spraying of fluid is characterised by an outer member of electrically insulating ' material having a plurality of fluid flow channels formed in its interior surface, an inner member within said outer member and over at least a portion of its outer surface nearest the discharge end of the sprayhead being in contact with said interior surface of the outer member, but terminating short ofsaid end, so that, in use, fluid flows in said channels between said outer member and said portion of the outer surface of the inner member, the outer member terminating in a sharp edge or point as the region of spray formation, and said inner member and/or said fluid being electrostatically charged, in use.
  • Fluid covers any form of substance capable of being sprayed, which is subject to certain electrical resistivity limitations.
  • Figure 1 shows the non-rotatable sprayhead comprising an inner part 1, of electrically conductive material, such as aluminium, within an outer part 2 of plastics or any other non-conductive material.
  • the outer part 2 is of hollow frusto-conical form having a sharp peripheral edge 3 at its liquid discharge end. At its other end the outer part has a short hexagonal part 4 which is internally threaded.
  • the inner part 1 fits within the outer part 2 and substantially conforms externally in shape to the internal shape of the outer part 2.
  • the inner part 1 has a recess 5 in its outer end surface providing a central flat circular surface 6 and substantially half-way along its external surface it is stepped to provide outer and inner frusto-conical surface portions 7 and 8 respectively.
  • the external surface of the outer portion 7 contacts the interior surface of the outer part 2, while the inner portion 8 is spaced from it to provide a clearance 9.
  • the inner part 1 terminates at its inner end above the part 4 of the outer member, and at its outer end terminates short of a point 13, which will be described hereinafter in relation to the interior surface of the outer part 2.
  • An electrically conductive liquid supply pipe 10 extends through the part 4 into the interior of the outer part 2 to terminate spaced from the inner part 1.
  • the internal threads of the part 4 contact the outer surface of the pipe 10 and a headed metal screw 11 secures'the inner part 1 to the pipe 10.
  • a head of the screw fits in the recess 5 and engages on the flat surface 6.
  • the stem of the screw passes through a central hole in the inner part 1.
  • the bottom of the part 4 contacts a seal 14 in an insulating shoulder part 15.
  • the part 15 is externally grooved and carries an insulated earthwire 22.
  • the pipe 10, which is surrounded by electrical insulation upto part 15, is connected to a high voltage supply at 16 and, in use, the liquid to be sprayed is supplied to the pipe 10.
  • the voltage should be at least 20 KV.
  • the wire 22 serves to intensify the electrostatic field.
  • the interior surface of the outer part 2 is formed with a plurality of V-shaped channels or grooves 17 moulded therein, the grooves extending substantially in radial planes.
  • Each groove as shown in Figures 2 and 3, increases constantly in depth and width.
  • the sides 18 of each groove 17 run out at said point 13 at the top of each groove, but such sides are effectively continued by respective surfaces 19 at 45° to the outer part 2, which converge to meet at the top of the outer part 2 to form teeth 20 aligned with the grooves at the end thereof.
  • Figure 3 shows schematically in full lines an inner part 1 having an annular edge 21 at the step between the portions 7 and 8.
  • the fluid flowing into the outer member 2 from the pipe 10 is thus constricted at said edge to flow in the grooves 17 which are of a certain depth and width adjacent the edge 21 producing a certain flow rate.
  • Figure 2 shows the positions of the edges 21, 21a and from Figures 2 and 3 it can clearly be seen how the area of each groove at a position adjacent edge 21a is greater than at a position adjacent edge 21.
  • the flow rate of the sprayhead can be altered as required.
  • a purchaser of the sprayhead would normally buy the sprayhead fitted with an insert giving a certain flow rate for a certain liquid, with there also being provided one or more additional inserts giving different flow rates for the same liquid or still different flow rates for liquids of different viscosities.
  • Such inserts could be marked for identification, for example by colour-coding.
  • liquid is-supplied to the pipe 10, which is connected to the high voltage supply at 16, and such liquid can flow from the pipe 10 through the groove 12 into the clearance 9.
  • the liquid is then constrained to flow in the grooves 17 on reaching the step between portions 7 and 8 and the spray is formed as ligaments from the edge 3. Electrostatic charging of the liquid occurs by way of the inner part 1, which receives charge via the screw 11 and pipe 10.
  • the liquid itself could be charged and the part 1 could then be non-conductive.
  • spray formation is from the non-conductive outer part 2 and specifically from the teeth 20 at edge 3.
  • teeth as zero issuing points to improve spray formation by minimising the surface tension forces holding the spray liquid to the sprayhead can be applied to electrostatic spraying, as described, by the use of a non-conducting spray forming part. If, instead, the teeth were made of conductive material, they would act as discharge points, leading to a leakage of charge and the disruption of spray formation.
  • the sprayhead is simple in construction, with the inner part quickly and easily replaceable as described to alter the flow rate.
  • the outer part is also easily replaceable if the teeth become damaged.
  • the described discharge of electrically charged liquid from teeth of non-conductive material is believed particularly advantageous, as is the ability to spray in any orientation.

Landscapes

  • Manufacturing Of Printed Circuit Boards (AREA)
  • Manufacturing Of Printed Wiring (AREA)
  • Electrostatic Spraying Apparatus (AREA)
EP84302710A 1983-04-23 1984-04-19 Tête de pulvérisation électro-statique Expired EP0123538B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84302710T ATE33457T1 (de) 1983-04-23 1984-04-19 Elektrostatischer spritzkopf.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8311100 1983-04-23
GB838311100A GB8311100D0 (en) 1983-04-23 1983-04-23 Sprayhead for electrostatic spraying

Publications (3)

Publication Number Publication Date
EP0123538A2 true EP0123538A2 (fr) 1984-10-31
EP0123538A3 EP0123538A3 (en) 1985-11-06
EP0123538B1 EP0123538B1 (fr) 1988-04-13

Family

ID=10541593

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84302710A Expired EP0123538B1 (fr) 1983-04-23 1984-04-19 Tête de pulvérisation électro-statique

Country Status (4)

Country Link
EP (1) EP0123538B1 (fr)
AT (1) ATE33457T1 (fr)
DE (1) DE3470391D1 (fr)
GB (1) GB8311100D0 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0186983A1 (fr) * 1984-12-20 1986-07-09 Imperial Chemical Industries Plc Pulvérisateur électrostatique
EP0243031A1 (fr) * 1986-04-21 1987-10-28 Imperial Chemical Industries Plc Appareil de pulvérisation électrostatique

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005095001A1 (fr) * 2004-04-02 2005-10-13 Wladimir Janssen Systeme efficace et souple de depot electrostatique a buses de pulverisation multiples

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2069150A (en) * 1935-07-22 1937-01-26 Leonard H Holder Roof cooling device
US3462685A (en) * 1965-01-28 1969-08-19 Vyzk Ustav Matemat Stroju Apparatus for automatically measuring the reverse recovery transient of a semiconductor diode
DE1577626A1 (de) * 1964-09-16 1969-09-25 Ashdee Corp Elektrostatische Spritzpistole
GB1243634A (en) * 1967-11-24 1971-08-25 Volstatic Ltd Improvements in or relating to electrostatic spray heads
US3630236A (en) * 1970-06-29 1971-12-28 Richard E Diggs Continuous mini-flow irrigation device
DE2541927A1 (de) * 1974-10-16 1976-04-29 Ransburg Japan Ltd Pulverzerstaeuberduese mit strahlverstellung
EP0031649B1 (fr) * 1979-12-21 1984-09-26 Imperial Chemical Industries Plc Récipients et porte-récipients utilisés dans la pulvérisation électrostatique

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2069150A (en) * 1935-07-22 1937-01-26 Leonard H Holder Roof cooling device
DE1577626A1 (de) * 1964-09-16 1969-09-25 Ashdee Corp Elektrostatische Spritzpistole
US3462685A (en) * 1965-01-28 1969-08-19 Vyzk Ustav Matemat Stroju Apparatus for automatically measuring the reverse recovery transient of a semiconductor diode
GB1243634A (en) * 1967-11-24 1971-08-25 Volstatic Ltd Improvements in or relating to electrostatic spray heads
US3630236A (en) * 1970-06-29 1971-12-28 Richard E Diggs Continuous mini-flow irrigation device
DE2541927A1 (de) * 1974-10-16 1976-04-29 Ransburg Japan Ltd Pulverzerstaeuberduese mit strahlverstellung
EP0031649B1 (fr) * 1979-12-21 1984-09-26 Imperial Chemical Industries Plc Récipients et porte-récipients utilisés dans la pulvérisation électrostatique

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0186983A1 (fr) * 1984-12-20 1986-07-09 Imperial Chemical Industries Plc Pulvérisateur électrostatique
EP0243031A1 (fr) * 1986-04-21 1987-10-28 Imperial Chemical Industries Plc Appareil de pulvérisation électrostatique
AU596167B2 (en) * 1986-04-21 1990-04-26 Procter & Gamble Company, The Electrostatic spraying apparatus

Also Published As

Publication number Publication date
EP0123538A3 (en) 1985-11-06
GB8311100D0 (en) 1983-05-25
EP0123538B1 (fr) 1988-04-13
DE3470391D1 (en) 1988-05-19
ATE33457T1 (de) 1988-04-15

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