Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
  • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
  • B05B7/02—Spray pistols; Apparatus for discharge
  • B05B7/10—Spray pistols; Apparatus for discharge producing a swirling discharge
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
  • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
  • B05B7/0075—Nozzle arrangements in gas streams

Definitions

• An apparatus with at least one liquid nozzle for spraying liquid on planted fields.
• the present invention relates to an apparatus for spraying liquid on planted fields, said apparatus being of the kind set forth in more detail in the preamble of claim 1.
• Prior apparatus of this kind have various disadvan- tages, of which the two most important ones are that the liquid drops ejected are easily influenced by the wind and therefore do not reach their disti- nation, and that the sprinkling becomes irregular, partly be- cause the lower leaves are "shaded" by the upper leaves, partly because very often the ventral sides of the leaves do not receive any liquid at all.
• the object of the present invention is to provide the construction of an apparatus of the kind referred to above, which does not have the above-mentioned disad ⁇ vantages, and said object is achieved by an apparatus, which according to the invention shows the features described in the characterizing clause of claim 1.
• the liquid drops eject ⁇ ed from the liquid nozzle are caught and directed by the air jet, whereby the wind influence is considerab ⁇ ly reduced, partly that the air jet makes the plants and their individual parts move with the effect that the liquid is spread considerably more regularly on all surfaces of the plant, including the ventral sides of the leaves, which receive liquid from air jets with partly upwards directed courses produced in the inte- rior of the hollow cone-shaped air jet.
• the apparatus comprises a container (not shown) for the liquid to be ejected as well as a so- called spray bar (likewise not shown) carrying a num ⁇ ber of downwards directed nozzles, through which the liquid is sprayed over a planted field in a manner known in principle.
• Said equipment which may in addi- tion comprise the required pumps, filters etc., is usually adapted to be carried by a tractor and driven by the power-drive attachment thereof.
• the nozzle unit 1 comprises a liquid nozzle 2, which together with a swivel 3 situated upstream is secured and connected to a liquid supply tube 4 by means of a coupling nut 5 countersunk in a recess 6 in the nozzle unit 1.
• the liquid nozzle 2 is of the kind, which in cooperation with the swivel 3 ejects the liquid supplied under pressure through the liquid supply tube 4 as small drops in a flow, which has the shape of a hollow cone with an appreciable angular extension 7 from the axis 8 of the liquid nozzle 2.
• the desired effect may be achieved by means of liquid nozzles, which produce other ejec ⁇ tion patterns, e.g. the so-called flat nozzles, which eject the drops in a fan-shaped pattern.
• the most important feature in the present connection is that the angular extension 7 of the ejected "fog jet" is not inconsiderable and the effect hereof will be ex ⁇ plained below.
• the term "fog” should be understood as comprising a large number of small li ⁇ quid drops, the size of which is not limited to the size of the drops forming natural fog.
• the liquid nozzle 2 is coaxially surrounded by an air nozzle 9 with an annular nozzle opening, which consti- tutes the mouth of a sectionally annular duct diverg ⁇ ing in the flow direction, which duct is limited on the outside by a conically diverging wall 11 and on the inside by a conically converging wall 12.
• Air is supplied to the air nozzle 9 from means (not shown), e.g.
• the strong, sectionally annular air flow from the air nozzle 9 is bound to carry away the air closest to the jet.
• a vacuum is produced inside the air jet in the area about the liquid nozzle 2, and it has been found that said vacuum causes some return flow from the hollow cone-shaped air flow as indicated by arrows 20. It has also been found that the air so flowing back carries away liquid drops and deposits them on the ventral sides of the leaves of the plants growing on the filed in question.
• the rotation of the air produced by the guide plates 17 causes the plants to be bent in a most gentle manner and possibly turned a little, which furthermore en- sures that also the upper side of leaves “shaded” by higher leaves as well as the stems of the plants are equally covered by exactly the liquid quantity re ⁇ quired for the actual purpose.
• the innermost limitation of the nozzle outlets 10 lies at a not inconsiderable distance from the liquid nozzle 2, as this permits the constitution of a space inside the hollow cone-shaped air flow, in which as mentioned above a vacuum is produced, which causes the aforesaid return flow, cf. the arrows 20.
• the entire nozzle unit 1 may - possibly together with several similar nozzle units - be adapted to be angu ⁇ larly adjusted in various directions.

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• Nozzles (AREA)

Applications Claiming Priority (2)

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ID=8101093

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• 1988
  • 1988-03-02 DK DK110888A patent/DK160916C/da not_active IP Right Cessation
• 1989
  • 1989-02-28 AU AU32925/89A patent/AU3292589A/en not_active Abandoned
  • 1989-02-28 WO PCT/DK1989/000045 patent/WO1989007886A1/en not_active Application Discontinuation
  • 1989-02-28 EP EP19890903710 patent/EP0373193A1/en not_active Withdrawn

Non-Patent Citations (1)

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