EP0123538B1 - Tête de pulvérisation électro-statique - Google Patents

Tête de pulvérisation électro-statique Download PDF

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Publication number
EP0123538B1
EP0123538B1 EP84302710A EP84302710A EP0123538B1 EP 0123538 B1 EP0123538 B1 EP 0123538B1 EP 84302710 A EP84302710 A EP 84302710A EP 84302710 A EP84302710 A EP 84302710A EP 0123538 B1 EP0123538 B1 EP 0123538B1
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.)
Expired
Application number
EP84302710A
Other languages
German (de)
English (en)
Other versions
EP0123538A3 (en
EP0123538A2 (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.
  • European published patent application No. 0031649A discloses a sprayhead for the electrostatic spraying of fluid comprising an outer member 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, so that, in use, fluid flows in said channels between said outer member and said portion of the outer surface of the inner member, said fluid leaving the sprayhead in an electrostatically charged state.
  • the outer member is of conductive material and the inner member terminates level with the discharge end of the outer member, with an annular orifice being formed between the two members at said discharge end. In use an electric field is generated between the charged orifice and an earthed conductor so that liquid leaving the orifice is broken up into uniformly sized particles.
  • 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 comprising an outer member 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, so that, in use, fluid flows in said channels between said outer member and said portion of the outer surface of the inner member, said fluid leaving the sprayhead in an electrostatically charged state, characterised in that the outer member is of electrically insulating material and terminates in a sharp edge or point being the region of spray formation, in that the inner member terminates short of said end of the outer member, and in that said inner member is of electrically conductive material and electrostatically charged, in use.
  • Fluid covers any form of substance capable of being sprayed, which is subject to certain electrical resistivity limitations.
  • 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 up to 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 in 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 ofthe edges 21, 21 a and from Figures 2 and 3 it can clearly be seen how the area of each groove at a position adjacent edge 21 a 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 forthe same liquid or still differentflow 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.
  • 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.

Claims (10)

1. Tête de vaporisation pour la vaporisation électrostatique de fluide, comprenant un élément extérieur (2) comportant une pluralité de canaux d'écoulement de fluide (17) formés dans sa surface intérieure, un élément intérieur (1) à l'intérieur dudit élément extérieur et sur au moins une portion (7) de sa surface extérieure la plus proche de l'extrémité de décharge de la tête de vaporisation étant en contact avec ladite surface intérieure de l'élément extérieur, de sorte qu'en cours d'utilisation, du fluide circule dans lesdits canaux (17) entre ledit élément extérieur et ladite portion (7) de la surface extérieure de l'élément intérieur, ledit fluide quittant la tête de vaporisation dans un état chargé électrostatiquement, caractérisée en ce que l'élément extérieur (2) est en une matière électriquement isolante et se termine par un bord aigu ou une pointe (20) constituant la région de vaporisation, en ce que l'élément intérieur (1) se termine peut avant ladite extrémité de l'élément extérieur (2), et en ce que ledit élément intérieur est en une matière électriquement conductrice et est chargé électrostatiquement, en cours d'utilisation.
2. Tête de vaporisation selon la revendication 1, caractérisé en ce que du fluide est envoyé, en cours d'utilisation, dans ledit élément extérieur par un tuyau d'alimentation (10) électriquement conducteur qui est vissé dans une partie cylindrique (4) de l'élément extérieur s'étendant de son extrémité éloignée de son extrémité à laquelle le fluide vaporisé est déchargé, en cours d'utilisation.
3. Tête de vaporisation selon la revendication 2, caractérisée en ce qu'un élément de fixation (11) électriquement conducteur conduit la charge transmise audit tuyau d'alimentation (10), en cours d'utilisation, audit élément intérieur (1) et fixe ledit élément intérieur en position dans ledit élément extérieur (2).
4. Tête de vaporisation selon la revendication 3, caractérisée en ce que ledit élément de fixation (11) est une vis à tête dont une tige passe par un trou formé dans l'élément intérieur (1) et s'engage dans une extrémité taraudée du tuyau d'alimentation, la tête de la vis contactant une surface de l'élément intérieur (1) tournée en dehors de la tête de vaporisation et la retenant ainsi dans l'élément extérieur (2).
5. Tête de vaporisation selon la revendication 4 caractérisée en ce qu'à partir de l'extrémité de ladite vis éloignée de ladite tête, une rainure (12) s'étend dans les filets de la vis jusqu'à une position écartée du tube d'alimentation (11) pour permettre au fluide de s'écouler, en cours d'utilisation, du tube dans l'élément extérieur.
6. -Tête de vaporisation selon l'une quelconque des revendications précédentes, caractérisée en ce que chaque canal d'écoulement de fluide (17) a une largeur et une profondeur qui augmentent vers ladite pointe de vaporisation.
7. Tête de vaporisation selon la revendication 6, dans laquelle ledit élément extérieur (2) comporte une surface intérieure tronconique, ladite tête de vaporisation étant caractérisée en ce que ladite portion de surface extérieure dudit élément intérieur (1) en contact avec la surface intérieure de l'élément extérieur est séparée par un gradin du reste de sa surface extérieure, de sorte que ledit reste est séparé vers l'intérieur de la surface intérieure dudit élément extérieur, le gradin définissant un bord (21, 21a) qui, en cours d'utilisation, oblige le fluide à l'intérieur de l'élément extérieur à s'écouler dans lesdits canaux (17) ce qui garantit une alimentation en liquide identique dans tous les canaux, indépendamment de l'orientation de la tête de vaporisation.
8. Tête de vaporisation selon la revendication 7, caractérisée en ce que la surface intérieure de l'élément extérieur (2) et les deux surfaces extérieures de l'élément intérieur (1) séparées par ledit gradin sont cylindriques en coupe transversale.
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
GB838311100A GB8311100D0 (en) 1983-04-23 1983-04-23 Sprayhead for electrostatic spraying
GB8311100 1983-04-23

Publications (3)

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

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8432274D0 (en) * 1984-12-20 1985-01-30 Ici Plc Electrostatic spraying
GB8609703D0 (en) * 1986-04-21 1986-05-29 Ici Plc Electrostatic spraying

Family Cites Families (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
GB1125446A (en) * 1964-09-16 1968-08-28 Ashdee Corp Electrostatic spraying gun
GB1083526A (en) * 1965-01-28 1967-09-13 Vyzk Ustav Matemat Stroju Apparatus for measuring the reverse recovery charge of fast semiconductor diodes
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
JPS5145143A (en) * 1974-10-16 1976-04-17 Ransburg Japan Ltd Funshapataanno choseiga kanona funtaitosoyofunshanozuru
DE3069312D1 (en) * 1979-12-21 1984-10-31 Ici Plc Containers and holders therefor for use in electrostatic spraying

Cited By (2)

* 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
US7845307B2 (en) 2004-04-02 2010-12-07 Wladimir Janssen Efficient and flexible multi spray electrostatic deposition system

Also Published As

Publication number Publication date
EP0123538A3 (en) 1985-11-06
ATE33457T1 (de) 1988-04-15
GB8311100D0 (en) 1983-05-25
EP0123538A2 (fr) 1984-10-31
DE3470391D1 (en) 1988-05-19

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