EP0452024A1 - Equipement de distribution d'un liquide - Google Patents

Equipement de distribution d'un liquide Download PDF

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Publication number
EP0452024A1
EP0452024A1 EP91302900A EP91302900A EP0452024A1 EP 0452024 A1 EP0452024 A1 EP 0452024A1 EP 91302900 A EP91302900 A EP 91302900A EP 91302900 A EP91302900 A EP 91302900A EP 0452024 A1 EP0452024 A1 EP 0452024A1
Authority
EP
European Patent Office
Prior art keywords
equipment
distribution element
distribution
delivery head
boss
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Withdrawn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
EP91302900A
Other languages
German (de)
English (en)
Inventor
David Charles Gill
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.)
Nomix Chipman Ltd
Original Assignee
Nomix Chipman 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 Nomix Chipman Ltd filed Critical Nomix Chipman Ltd
Publication of EP0452024A1 publication Critical patent/EP0452024A1/fr
Withdrawn legal-status Critical Current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
    • B05B3/00—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements
    • B05B3/02—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements
    • B05B3/10—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements discharging over substantially the whole periphery of the rotating member
    • B05B3/1007—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements discharging over substantially the whole periphery of the rotating member characterised by the rotating member
    • B05B3/1014—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements discharging over substantially the whole periphery of the rotating member characterised by the rotating member with a spraying edge, e.g. like a cup or a bell

Definitions

  • This invention relates to equipment for distributing a liquid, and is particularly, although not exclusively, concerned with equipment for distributing agricultural and horticultural chemicals, such as herbicides.
  • GB-A-2194467 discloses a delivery head for, for example, a hand-held herbicide applicator. GB-A-2194467 also discloses rotary distribution elements for use with the delivery head.
  • the delivery head disclosed in GB-A-2194467 comprises a motor housing provided with a projecting boss having a central aperture into which projects a drive spindle of an electric motor accommodated within the housing.
  • the distribution element has a hollow drive shank which extends into the central aperture and fits over the drive spindle, in order that the distribution element may be driven, in operation.
  • An annular recess surrounds the drive shank, this recess receiving the outer extremity of the projecting boss.
  • An outlet for liquid is provided in the motor housing, and this outlet opens into the recess.
  • the distribution element has a distribution surface across which liquid flows, in use, to be discharged from the outer periphery of the distribution element under centrifugal force. The distribution surface is spaced in the direction towards the delivery head from a transverse plane containing the outer extremity of the projecting boss.
  • This arrangement of delivery head and distribution element works effectively, and, with appropriate herbicide formulations, enables a user to deliver the herbicide in the form of droplets of generally uniform size with a median droplet diameter of approximately 600 microns.
  • equipment for distributing a liquid comprising a delivery head provided with a projecting boss having a central aperture which receives a drive shank of a motor driven rotary distribution element, the boss also having an outlet disposed adjacent the central aperture for supplying liquid to the distribution element, the distribution element having a distribution surface from which, in use, liquid is discharged, the distribution surface being spaced, in a direction away from the delivery head, from a transverse plane containing the extremity of the boss.
  • the drive shank is hollow, so that the distribution element is a push fit onto a drive spindle of a motor accommodated within the delivery head.
  • Stop means may be provided for limiting the extent to which the distribution element can be pushed onto the drive spindle.
  • the stop means may comprise an end face of the central bore in the hollow drive shank.
  • the space between the distribution surface and the transverse plane should be less than one millimetre, and is preferably less than 0.5mm. Good results have been achieved using a distribution element having a generally square outer periphery with a dimension across its diagonals of 16mm.
  • the distribution element may have an annular recess disposed between the drive shank and the distribution surface. This annular recess may have a generally frusto conical end surface which is inclined from the rotary axis of the disc in a direction away from the delivery head.
  • the delivery head comprises inner and outer housing components 2 anddd 4.
  • the inner housing component 2 accommodates an electric motor 6, having a drive spindle 8.
  • the delivery head has a projecting boss 10 which comprises an inner projection 12 formed on the inner component 2 and an outer projection 14 formed on the outer component 4.
  • the inner projection 12 has a central aperture 16 into which the drive spindle 8 extends.
  • the inner and outer projections 12 and 14 define between them an annular outlet 18 through which, in use, flows herbicide to be delivered. Further details concerning the construction of the delivery head are given in GB-A-2194467 and GB-A-2172524.
  • a rotary distribution element 20 is fitted to the delivery head.
  • the distribution element 20 has a hollow drive shank 22 which extends into the central aperture 16 and is a press fit over the drive spindle 8.
  • the distribution element has an annular recess 24 surrounding the drive shank 22, and both the inner and outer projections 12, 14 of the projecting boss 10 extend into the recess 24.
  • the distribution element 20 also has a distribution surface 26 across which liquid flows, in operation, to be discharged in the form of droplets at its outer periphery.
  • the distribution element shown in Figure 1 is the same as that shown in Figures 4 to 7 of GB-A-2194467.
  • the distribution element 20 is pushed on to the spindle 8 as far as it will go, the limit of movement being defined either by contact with the extremity of the inner projection 12 with the base of the recess 24, or by contact between the drive spindle 8 and the end face of the hollow interior of the drive shank 22.
  • This limit position is shown in Figure 1, and it will be appreciated that the distribution surface 26 is disposed closer to the main body of the delivery head than the extremity of this projecting boss 10. This has previously been felt to be desirable, in order to achieve a wiping action between the outer projection 14 and the wall of the recess 24 adjacent the distribution surface 26, in order to achieve even distribution of liquid over the distribution surface 26.
  • the configuration of the distribution element 20′ is generally similar to that of the distribution element 20, and in particular it has a generally square outer periphery. However, as shown in Figure 2, the face of the distribution element 20′ away from the delivery head is part-spherical, instead of flat. Also, the recess 24′ terminates at a frusto conical surface 32 which slopes from the rotary axis of the distribution element 20′ away from the transverse plane 30.
  • the median size of droplets discharged from the distribution element 20′ in operation is slightly smaller than the median size of droplets discharged from the disc 20 disposed as shown in Figure 1, when using the same liquid and the same rotational speed (5 to 200 r.p.m).
  • the median size of the droplets discharged using the arrangement shown in Figure 2 is approximately 400 microns, compared with a median size of approximately 600 microns discharged using the arrangement of Figure 1. It is not, at present, entirely clear why this difference should occur, but it is believed to derive from the occurrence of a different mechanism by which liquid is transferred from the outlet 18 to the distribution surface 26 or 26′.

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  • Nozzles (AREA)
EP91302900A 1990-04-12 1991-04-03 Equipement de distribution d'un liquide Withdrawn EP0452024A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB909008460A GB9008460D0 (en) 1990-04-12 1990-04-12 Equipment for distributing a liquid
GB9008460 1990-04-12

Publications (1)

Publication Number Publication Date
EP0452024A1 true EP0452024A1 (fr) 1991-10-16

Family

ID=10674429

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91302900A Withdrawn EP0452024A1 (fr) 1990-04-12 1991-04-03 Equipement de distribution d'un liquide

Country Status (2)

Country Link
EP (1) EP0452024A1 (fr)
GB (1) GB9008460D0 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2526330A1 (fr) * 1982-05-04 1983-11-10 Cocovi Garcia Juan Appareil de pulverisation centrique notamment a usage agricole d'application d'herbicides
JPS58199068A (ja) * 1982-05-15 1983-11-19 Matsushita Electric Works Ltd 液状樹脂散布装置
EP0249470A2 (fr) * 1986-06-12 1987-12-16 Nomix-Chipman Limited Distributeur rotatif de liquide

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2526330A1 (fr) * 1982-05-04 1983-11-10 Cocovi Garcia Juan Appareil de pulverisation centrique notamment a usage agricole d'application d'herbicides
JPS58199068A (ja) * 1982-05-15 1983-11-19 Matsushita Electric Works Ltd 液状樹脂散布装置
EP0249470A2 (fr) * 1986-06-12 1987-12-16 Nomix-Chipman Limited Distributeur rotatif de liquide

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, vol. 8, no. 41 (C-211)[1478] 22 February 1984; & JP-A-58 199 068 (MATSUSHITA DENKO K.K.) 19 November 1983, *

Also Published As

Publication number Publication date
GB9008460D0 (en) 1990-06-13

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