WO1986003991A1 - Dispositif de pulverisation de fluide - Google Patents

Dispositif de pulverisation de fluide Download PDF

Info

Publication number
WO1986003991A1
WO1986003991A1 PCT/GB1986/000016 GB8600016W WO8603991A1 WO 1986003991 A1 WO1986003991 A1 WO 1986003991A1 GB 8600016 W GB8600016 W GB 8600016W WO 8603991 A1 WO8603991 A1 WO 8603991A1
Authority
WO
WIPO (PCT)
Prior art keywords
disc
liquid
housing
spray
gateway
Prior art date
Application number
PCT/GB1986/000016
Other languages
English (en)
Inventor
Roberto Francesco Cosentino
Carlo Maria Pensa
Original Assignee
Pharmindev Limited
O.D.L. S.R.L.
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 Pharmindev Limited, O.D.L. S.R.L. filed Critical Pharmindev Limited
Publication of WO1986003991A1 publication Critical patent/WO1986003991A1/fr

Links

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
    • B05B3/08—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements in association with stationary outlet or deflecting elements
    • B05B3/082—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements in association with stationary outlet or deflecting elements the spraying being effected by centrifugal forces
    • B05B3/085—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements in association with stationary outlet or deflecting elements the spraying being effected by centrifugal forces in association with sectorial deflectors
    • 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
    • B05B3/001—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements incorporating means for heating or cooling, e.g. the material to be sprayed

Definitions

  • the present invention relates to a fluid spraying device or atomiser and, more particularly, to such a device wherein fluid to be atomised is delivered onto a rotary disc so that in use a spray of finely divided fluid is shed from a peripheral portion of the disc.
  • Various spraying devices are well known in the art, by which particles of liquids or emulsions are atomised into minute droplets by the centrifugal force and produce a spray around a 360 degree arc .
  • the finest and most homogeneous spray is obtained using rotatable disc spraying devices, but the fact that the output spray is developed around a 360° arc represents a considerable drawback.
  • a directional spray can be produced using nozzle systems with or without air injection, high pressure or other contrivances, but such systems invariably suffer from clogging. Also the size of particles contained in the spray, varies considerably - both very small and very large particles being mixed together.
  • a method of producing a directional spray of liquid wherein liquid to be sprayed is delivered onto a surface of the disc rotating at high speed and is shed from around the periphery thereof in the form of a finely divided spray and comprising confining the disc within an enclosure having a gateway affording an outlet for only a predetermined sector of the spray.
  • the remaining or unused fluid is preferably collected within the housing for recycling to the rotatable disc .
  • a directional spraying device comprising a housing defining a chamber, a rotatable disc enclosed within the chamber, a motor for driving the disc at high speed, a feed system for delivering liquid to be sprayed onto a surface of the disc to be shed from around a peripheral portion thereof in the form of a finely divided spray, the housing having a gateway aligned with the peripheral portion of the disc in a direction normal to the axis of rotation and corresponding in angular extent to only a sector of the peripheral portion of the disc whereby the spray of liquid emerging from the housing through the gateway has a predetermined limited angular range.
  • the size of the rotary disc is selected or is variable according to the nature of the liquid to be atomised and of the desired output and the disc is preferably driven by a motor having a variable speed of from 0 to 60,000 rpm.
  • the housing is best made of non conductive material.
  • the rotatable disc is preferably dished and may be either inverted or upright, the liquid in each case being delivered onto the internal (i.e. concave) surface thereof and due to the action of centrifugal force, distributed over the lip of the dished disc to produce a finely divided spray around a 360° arc.
  • the angular range of the spray emerging from the housing is determined by the size of the gateway which may be variable in size to permit adjustment of the spraying range .
  • the shape and size of the gateway may be such as to restrict the field of spraying in other directions, to produce any desired contour.
  • the gateway may be defined by an outlet opening in the walls of the housing or in a baffle or the like suspended in the path of the spray to the outlet opening, or by -a combination of the two.
  • Liquid may be delivered either from an external source or recycled from a sump within the housing, by a liquid feed system incorporating a pump.
  • the spraying device may have a recycling duct to which suction is applied by rotation of atomising disc or by a separatre impeller.
  • the spraying device of the present invention is particularly suited for use in the electrostatic deposition of coating materials inter_a_l_ia_ because the electro-static effect is enhanced due to the homogeneity and fineness of Lhe obtained droplets.
  • the spraying device of the present invention When used for electrostatic deposition, the spraying device of the present invention is connected to a high potential difference for charging the particles whether by ionisation, induction or contact depending upon the properties of the liquid employed: fluidity, viscosity, surface tension, conductivity, capacity of the metering device .
  • the spraying device of the present invention is ideally suited for use in electrostatic spray deposition.
  • Figure 1 is a cross—section of one embodiment of liquid atomiser according to the present invention.
  • Figure 2 is a part cross-sectional view on arrow A in Figure 1 ;
  • Figure 3 is a cross-section of another embodiment of atomiser particularly suitable for spraying hot liquids
  • Figure 4 shows a detail of a modified embodiment similar to the embodiment of Figure 3;
  • Figure 5 is a part cross-sectional view on arrow B in Figure 2;
  • Figure 6 is a cross-section of a third embodiment of atomiser according to the invention.
  • Figure 7 is a cross-section of a fourth embodiment of liquid atomiser according to the invention.
  • FIG 8 is cross-section on arrow C in Figure 7.
  • the liquid atomiser of Figure 1 comprises a square housing 10 on which is mounted a variable speed motor 11 which is normally a pneumatic motor, the output shaft 12 of which extends downwardly into a chamber defined within the housing 10 and has mounted fo.r rotation therewith an inverted dished disc 14 arranged within a splash guard in the form of a cylindrical skirt 16.
  • Liquid is pumped from a reservoir 20 having a level control 21, along an inlet pipe 22 communicating with transverse passages 24 in a discharge head 26, from which liquid is delivered onto the underside surface of the disc 14 rotating at high speed. Due to the action of centrifugal force, liquid spreads over the disc and is shed in a finely divided spray from all around the peripheral edge of the disc in a plane generally normal to the axis of rotation of the disc.
  • a gateway 30 including an outlet slot 32 through which a portion of the finely divided spray 34 issued from the housing.
  • the gateway 30 is arranged symmetrically with respect to the direction of rotation, about a diametral line through the disc 14, the sector or angular range of the spray 34 emerging from the housing 10 being detercined by the length of the slot 32.
  • the remainder of the spray 34 collides with the interior of the housing and drains into a sump 36 at the bottom of the housing 10, the sump 36 being connected by a pipe 38 to return unused liquid to the reservoir 20.
  • the direction of the spray can be adjusted by adjusting the position of the housing and that the angular extent or field of the spray depends upon the length of the outlet slot 32 which, if desired, may also be made adjustable.
  • the peripheral edge 40 thereof is mitred as shown so that the slot converges in the spraying direction to a lip 42 on the downstream side.
  • liquid incidient thereon will simply drain down into the sump 36 but along the top edge liquid would flow to the lip 42 from which drips would fall outside the housing
  • the gateway 30 includes a mitred member 44which is disposed adjacent the upper edge of the opening so forming a V-shaped channel 46 between the downstream lip and an upstream lip 48 on the mitred member. Any drops thus fall into the chamber and drain into the sump 36.
  • Figures 3 - 5 are similar to the embodiment of Figure 1 in that they include an inverted dished disc 14 but in these embodiments liquid is drawn upwardly from the sump 36 along a suction tube 50 from which it is delivered onto the underside of the disc.
  • liquid is drawn upwardly along helical grooves 54formed in an extension 52 of the motor shaft 12 rotating within the tube 50.
  • a separate impeller 56 connected for rotation with the motor shaft 12 is provided and serves also to cool down the liquid to be sprayed.
  • the embodiments of Figures 3 to 5 are similar to the embodiment of Figures 1 and 2 except that the gateway 30 includes an additional mitred member 58 provided along the inside lower edge of the outlet opening 32 so defining with the mitred edge of the opening an open ended V-shaped channel 60 between the upstream 62 and downstream lips 64, along which liquid can drain into the chamber .
  • the embodiment of Figure 6 differs from the above described embodiment, in that the dished disc 14 is upright, so that liquid delivered onto the disc moves radially outwardly and upwardly to the peripheral edge, to be shed therefrom in a finely divided spray.
  • Figures 7 and 8 show an embodiment of atomiser for producing a directional spray 70 inclined below the horizontal and is suitable for applications in which, a product to be sprayed is moved past the atomiser on a conveyor.
  • the top 72 of the housing 10 on which the motor 11 is mounted, is inclied such that the motor shaft 12 and the disc 14 rotate about an axis that is inclined to the vertical producing a spray radiating from the axis in an inclined plane.
  • the gateway 30 in this embodiment is provided by a baffle plate 74 secured to the housing wall by a pillar 76 and suspended between the disc 14 and an outlet slot 78 in the housing wall.
  • the edges of a slot 80 in the baffle plate 74 are mitred so that the slot diverges to form a lip 82 at the downstream side of the baffle plate. It is the length of the slot 80 in the baffle plate 74 and not the outlet opening 78 that determines the field of. spray 70 emerging from the housing and the baffle plate shields to a considerable extent the housing wall in the region around the outlet opening. For this reason, most of the excess liquid drops from the baffle plate directly into the sump, however, and dripping from the outlet opening is largely eliminated. If needed, however, a lip such as shown in Figure 1 or Figure 2 may be provided around the outlet opening.
  • the housing may have an inner chamber 84enclosing the rotating disc 14 and an outer chamber 86 around the inner chamber providing a heating jacket for heating the liquid to be sprayed. This is necessary when spraying certain viscous fluids. Heat may be supplied in any convenient manner known to those skilled in the art.
  • the jacket is filled with oil an d heate d by an electric heating element

Landscapes

  • Nozzles (AREA)

Abstract

Dispositif de pulvérisation de fluide ou atomiseur du genre dans lequel le liquide à pulvériser est délivré sur la surface d'un disque (14) tournant à haute vitesse. Le disque est enfermé dans une enceinte (10) munie d'une porte offrant un passage de sortie pour seulement une zone ou une plage angulaire limitées de la pulvérisation (34) de fluide versé depuis la périphérie du disque (14). Pour éviter le dégouttement de la sortie de pulvérisation, la forme des bords (40, 44) d'une ouverture définissant la porte (30) permet au fluide en excès de s'écouler ou de dégoutter dans l'enceinte.
PCT/GB1986/000016 1985-01-09 1986-01-09 Dispositif de pulverisation de fluide WO1986003991A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB858500488A GB8500488D0 (en) 1985-01-09 1985-01-09 Fluid spraying device
GB8500488 1985-01-09

Publications (1)

Publication Number Publication Date
WO1986003991A1 true WO1986003991A1 (fr) 1986-07-17

Family

ID=10572584

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1986/000016 WO1986003991A1 (fr) 1985-01-09 1986-01-09 Dispositif de pulverisation de fluide

Country Status (3)

Country Link
EP (1) EP0215806A1 (fr)
GB (1) GB8500488D0 (fr)
WO (1) WO1986003991A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995003893A1 (fr) * 1993-08-03 1995-02-09 Mantis Ulv-Sprühgeräte Gmbh Buse rotative a segments

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE387792A (fr) *
FR900028A (fr) * 1943-07-12 1945-06-18 Pistolet lance peinture
CH264058A (fr) * 1946-01-18 1949-09-30 Omar Norris Edward Appareil pulvérisateur.
US2550714A (en) * 1946-04-03 1951-05-01 Edward O Norris Spraying device
US2703257A (en) * 1953-06-23 1955-03-01 Edward O Norris Spraying apparatus
US3192167A (en) * 1962-09-20 1965-06-29 Ogawa Abiko Low pressure liquid vaporizer which is electrically heated
GB1564700A (en) * 1976-12-07 1980-04-10 Bals Edward Julius Rotary atomisers

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE387792A (fr) *
FR900028A (fr) * 1943-07-12 1945-06-18 Pistolet lance peinture
CH264058A (fr) * 1946-01-18 1949-09-30 Omar Norris Edward Appareil pulvérisateur.
US2550714A (en) * 1946-04-03 1951-05-01 Edward O Norris Spraying device
US2703257A (en) * 1953-06-23 1955-03-01 Edward O Norris Spraying apparatus
US3192167A (en) * 1962-09-20 1965-06-29 Ogawa Abiko Low pressure liquid vaporizer which is electrically heated
GB1564700A (en) * 1976-12-07 1980-04-10 Bals Edward Julius Rotary atomisers

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995003893A1 (fr) * 1993-08-03 1995-02-09 Mantis Ulv-Sprühgeräte Gmbh Buse rotative a segments
US5788156A (en) * 1993-08-03 1998-08-04 Mantis Vlv-Spruhgerate Gmbh Segment rotary nozzle

Also Published As

Publication number Publication date
EP0215806A1 (fr) 1987-04-01
GB8500488D0 (en) 1985-02-13

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