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EP1159075A1 - Atomiseur centrifuge - Google Patents

Atomiseur centrifuge

Info

Publication number
EP1159075A1
EP1159075A1 EP00909066A EP00909066A EP1159075A1 EP 1159075 A1 EP1159075 A1 EP 1159075A1 EP 00909066 A EP00909066 A EP 00909066A EP 00909066 A EP00909066 A EP 00909066A EP 1159075 A1 EP1159075 A1 EP 1159075A1
Authority
EP
European Patent Office
Prior art keywords
atomizer
liquid
sealing
atomizer wheel
acceleration chamber
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
EP00909066A
Other languages
German (de)
English (en)
Other versions
EP1159075B1 (fr
Inventor
Ole Teglhus Kragh
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.)
APV Anhydro AS
APV Nordic AS
Original Assignee
APV Anhydro AS
APV Nordic AS
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 APV Anhydro AS, APV Nordic AS filed Critical APV Anhydro AS
Publication of EP1159075A1 publication Critical patent/EP1159075A1/fr
Application granted granted Critical
Publication of EP1159075B1 publication Critical patent/EP1159075B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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
    • B05B3/10—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
    • B05B3/1057—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 with at least two outlets, other than gas and cleaning fluid outlets, for discharging, selectively or not, different or identical liquids or other fluent materials on the rotating element
    • 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
    • B05B3/1021—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 individual passages at its periphery

Definitions

  • the invention relates to a centrifugal atomizer comprising an atomizer wheel mounted on a driven shaft and defining an acceleration chamber, where liquid is fed to said acceleration chamber through a stationary, annular distribution member and a correspondingly annular opening in the atomizer wheel, and where said liquid is ejected from said acceleration chamber in form of a spray through openings distributed in the circumferential direction.
  • Centrifugal atomizers are known where the atomizer wheel is driven by a vertically extending shaft which is driven by means of a suitable actuating means and is mounted by means of oiled bearings.
  • the atomizer wheel includes an acceleration chamber which is supplied with a liquid through a stationary annular distribution member projecting into an annular opening in the upper face of said atomizer wheel.
  • the liquid passing through the distribution member and into the acceleration chamber of the atomizer wheel is accelerated to speeds in the range of 100 to 200 m per second before it leaves again through the openings of said atomizer wheel provided along the circumference of said atomizer wheel and is atomized.
  • a very turbulent state is caused in the acceleration chamber.
  • drops from the acceleration chamber can be ejected through the slit between the external side of the distribution member and the adjacent part of the atomizer wheel so as subsequently to spread over the upper face of the atomizer wheel and the lower face of the adjacent stationary parts of the centrifugal atomizer, where they can deposit in form of a dried out product layer.
  • This product layer may in time become discoloured or assimilate undesirable properties in another way, and can be torn loose from time to time because under some circumstances a product layer can be formed which is so thick that an actual wearing off takes place.
  • the rotating atomizer wheel possesses due to its geometry a predetermined ability to pump out air in the same manner as a centrifugal ventilators and therefore a negative pressure arises in the interior of the wheel, said negative pressure having the effect that said impurities can be pulled into the acceleration chamber of the wheel again through said slit between the distribution member and the atomizer wheel.
  • the ventilating air can carry bacteria and other micro-organisms into the acceleration chamber through both the outer and the inner slit or through the ventila- tion path and thereby pollute the liquid to be atomized.
  • the object of the invention is to provide a centrifugal atomizer avoiding the above draw-backs, and whereby the need for a regular dismounting and manual cleaning of the atomizer wheel and the adjacent parts and consequently an interruption of the production has been reduced.
  • the centrifugal atomizer according to the invention is characterised in that a sealing means is associated with passages provided between the distribution member and the respective sides of the corresponding opening in the atomizer wheel, said sealing means comprising a stationary, circumferential and projecting rib which projects radially into a quantity of a sealing liquid in an annular groove adapted to rotate together with said atomizer wheel, means being provided for feeding said grooves with sealing liquid and for removing, respectively, said sealing liquid from said grooves.
  • the said impurities can all be dissolved in, suspended in, precipitated in, emulsified in and chemically reacted with or collect on the surface of a sealing liquid which can be suitably chosen in accordance with the liquid to be treated in the centrifugal atomizer.
  • the sealing means may particularly advantageously be provided between the annular distribution member and the adjacent side of the opening in the atomizer wheel, the grooves being formed directly on said atomizer wheel and the ribs on the distribution member in such a manner that the sealing and consequently the removal of the impurities is carried out as close as possible to the acceleration chamber.
  • the means for feeding and removing the sealing fluid may comprise a plurality of outlet openings and inlet openings provided on the ribs, said outlet openings and said inlet openings being arranged on the outer periphery of the ribs and on the side of said ribs, respectively, being farthest away from the accelera- tion chamber.
  • the means for feeding and removing sealing liquid may comprise pumping devices adapted to feed more sealing liquid than is removed with the result that it is possible always to flush the portions of said passages adjacent the acceleration chamber and thereby remove deposits deriving from the liquid to be treated in the centrifugal atomizer.
  • the grooves of the sealing means on the side adjacent the acceleration chamber may according to the invention particularly advantageously be defined by a ring secured on the atomizer wheel, and at least the ring present on the outer side of the distribution member when seen in the radial direction may be secured to said atomizer wheel through an additional separately secured ring defining the side of the groove being farthest away from said acceleration chamber. In this manner it is possible in a relatively easy manner to assemble and disassemble the parts in question in connection inter alia with a cleaning.
  • the distribution member adjacent at least one of the grooves of the sealing means may comprise a member projecting into the acceleration chamber, said member protecting the groove against direct splashes of liquid from said acceleration chamber.
  • the said protecting member may according to the invention be a separate ring secured on the distribution member in such a manner that said protecting member also can be easily disassembled in connection inter alia with a cleaning.
  • Fig. 1 is a diagrammatic view, partly in section of a known centrifugal atomizer
  • Fig. 2 is a radial sectional view through a preferred embodiment of the area adjacent the atomizer wheel of a centrifugal atomizer according to the invention.
  • the centrifugal atomizer shown in Fig. 1 comprises a so-called atomizer body 1 mounted on a motor 2 which drives a shaft or a stem 4 through a gear arrangement 3.
  • This shaft is mounted in oiled bearings 5, and at the end it carries an atomizer wheel 6.
  • this shaft is provided with an oil ejecting ring 7 carrying the used lubricating oil downwards into a reservoir 8. From the reservoir the lubricating oil can be removed at suitable intervals or by means of an automatically controlled pump.
  • a guide bearing 9 in form of a slide bearing is mounted between the lower bearing 5 and the atomizer wheel 6, said guide bearing being adapted to limit the movements of the free shaft end 10, especially while passing critical numbers of revolutions during the starting and stopping of the atomizer wheel 6.
  • a liquid to be atomized in the centrifugal atomizer is fed into a feeding pipe 11 , and through this feeding pipe the liquid is carried through the bottom plate 12 of the atomizer body and further down into an annular liquid distributor 13 permanently mounted on said bottom plate.
  • the liquid flows through one or more openings 14 in the fluid distributor 13 and downwards into an acceleration chamber 15 in the atomizer wheel 6.
  • the acceleration chamber 15 the liquid is accelerated by way of friction so as finally to be ejected through openings 16 distributed along the periphery of the atomizer wheel.
  • the annular liquid distributor 13 projects through an annular opening 19 in the upper face of the atomizer wheel 6 and a short distance into the acceleration chamber 15 of said atomizer wheel 6.
  • a slit or passage 17 and 18, respectively is left between the inner face and the outer side of the fluid distributor 13 and the adjacent parts of the atomizer wheel 6.
  • This slit or passage 17 and 18, respectively, is formed with a suitable clearance in order to ensure a possibility of the lower end of the shaft 10 and the atomizer wheel 6 connected thereto moving without the distributor 13 hitting the sides of the opening 19.
  • Pure air is carried through a pipe 20 downwards into the cavity 21 above the atomizer wheel 6 in order to prevent air both from being pulled in from the outside through the opening 19 and from entraining the impurities from the area outside the orifice of the pipe 20 through the opening 19.
  • Fig. 2 is a sectional view in greater detail of the lower portion of a centrifugal atomizer according to the invention.
  • the portion not shown of the centrifugal atomizer corresponds substantially to the known centrifugal atomizer of Fig. 1 and corresponding parts are designated the same reference numerals.
  • An atomizer wheel 29 is mounted on the lower portion of the shaft 28 in the centrifugal atomizer according to the invention, and an annular liquid distributor 30 is mounted on the stationary atomizer bottom plate 31.
  • the liquid to be atomized is carried through a pipe 32 into an annular chamber 33. From this annular chamber 33 the liquid is carried out into the acceleration chamber 35 of the atomizer wheel 29 through channels 34 in the wall of the liquid distributor 30.
  • liquid distributor 30 projects through an annular opening 27 in the upper face of the atomizer wheel 29.
  • passages 36 and 37 are defined on the inner side and the outer side of the liquid distributor 30, said passages allowing the above movement of the shaft end 28 and the atomizer wheel 29.
  • a sealing means comprising an annular chamber or an annular groove 38 and 39, respectively, is provided in connection with each of these passages 36, 37, said sealing means being permanently connected to the atomizer wheel 29.
  • These passages 36 and 37 are further associated with a circumferential, projecting rib 40 and 41 , respectively, which in turn is permanently connected to the liquid distributor 30.
  • These ribs project radially outwards from the liquid distributor and into their respective annular grooves 38 and 39, respectively, in such a manner that a substantially U-shaped branching when seen in cross section in the respective passages 36, 37 is defined between the ribs 40, 41 and the walls of the corresponding groove 38, 39.
  • a quantity of liquid is maintained in this U-shaped branching by means of the rotation of the atomizer wheel 29.
  • This liquid functions as a sealing liquid in relation to the impurities passing through the respective passages 36, 37.
  • This liquid is fed to the U-shaped chambers through channels 42, 43 extending from sources (not shown) and associated pumps (not shown) through the atomizer body 1 and further through the liquid distributor 30 and the respective ribs 40, 41 and ending at the outer periphery thereof where said channels form outlet openings 44 and 45 , respectively, for the sealing liquid.
  • inlet openings (not shown), channels (not shown) and pumps (not shown) are provided for draining off the sealing liquid from the U-shaped chambers.
  • inlet openings are provided on the side of the ribs 40, 41 facing away from the acceleration chamber 35 in such a manner that the impurities passing from the outside and into the sealing fluid are removed as fast as possible before the quantity of sealing liquid present at the bottom of the respective grooves 38, 39 is polluted.
  • the annular groove 38 associated with the passage 36 adjacent the shaft 28 is manufactured by means of a separate ring 50 secured to the atomizer wheel 29 by means of screws 51.
  • the groove 39 associated with the passage 37 is formed by means of a ring 52 se- cured to a second ring 53 by means of screws 54 and sealed by means of a gasket 55 , the pressure in the outer layer of the sealing liquid otherwise involving an emptying of the sealing chamber through the abutment face between said rings.
  • the ring 53 is secured to the atomizer wheel 29 by means of screws 56.
  • a gasket 57 corresponding to the gasket 55 is also arranged between the ring 50 and the atomizer wheel 29.
  • the use of the described centrifugal atomizer maintains a seal in the passages 36 and 37 by establishing a quantity of sealing liquid in the respective annular grooves 38, 39.
  • the feeding and the removal of the sealing liquid are adjusted by means of a control unit placed outside the centrifugal atomizer in such a manner that a quantity of sealing liquid is always fed which is sufficient for removing impurities, said control unit co-currently maintaining the temperature of the sealing liquid at a suitable level below its boiling point.
  • the feeding of a quantity of sealing liquid slightly exceeding the quantity of sealing liquid being drained off has the result that the slits 46 and 47 between the rotating rings 50 and 52, respectively, and the stationary liquid distributor are advantageously flushed free of possible smudges deriving from the acceleration chamber 35. Therefore the liquid chosen as sealing liquid is not injurious to the liquid to be treated in the acceleration chamber 35.
  • Impurities which are not dissolved in or form a homogenous mixture with the sealing liquid and with a density corrresponding to or lower than the density of the sealing liquid.
  • Such impurities are for instance in form of a particle-shaped material or lubricating oil deriving from aerosols from the interior of the centrifugal atomizer, and due to the centrifugal effect they deposit on the surface of the sealing liquid in the portion of the U-shaped chamber facing the surroundings.
  • Impurities which are not dissolved in or form a homogenous mixture with the sealing liquid and have a density higher than the density of the sealing liquid. Such impurities are collected at the bottom of the respective grooves 38, 39, viz. in the outer layers of the U-shaped chamber when seen in the radial direction. Such impurities can be in form of a particle-shaped material deriving from the atomizer liquid, or be in form of material dust deriving from a wearing off in the guide bearing 9.
  • impurities can be removed in two ways depending on the nature thereof: 3.1 A particular liquid is fed to the sealing means optionally by way of a brief routine procedure, said liquid being known to be able to dissolve the impurities or convert said impurities into a material meeting the requirements presented in the above item 1 or 2 and which is subsequently removed as described in these items.
  • a continuous analysing of the liquid returning from the sealing means with respect to type and quantity of impurities renders it possible to establish a hitherto unknown monitoring of the function of the atomizer wheel during operation. It is possible to connect market available analysis apparatuses in a simple manner to the return flow from the sealing means in such a manner that the operational employees always can monitor the impurities being removed from the atomizer wheel.
  • the centrifugal atomizer according to the invention presents furthermore the advantage that the previously critical tolerances in the passages 36, 37 now on the whole are without importance because abundant clearances can be chosen without paying regard to the function of the sealing means or to the function of the entire centrifugal atomizer.
  • the latter is important for the cost-intensive replacement of the atomizer wheel 29 and the liquid distributor 30.
  • Previ- ously these parts were often damaged because a metallic contact sometimes occurred due to the necessary narrow clearances, such as in connection with unexpected high unbalances.
  • ventilation air is prevented from penetrating into the acceleration chamber. In connection with the known atomizers the ventilation air pene- trated into the acceleration chamber 35 and caused for instance a partial drying out of the liquid being treated therein.
  • the sealing liquid being fed to the sealing means must be without solid particles of a density exceeding the density of said sealing liquid, and it can be chosen with respect to various requirements. Some of the preferred types of liquid can be used separately or alternately. These liquids are briefly summarized below:
  • Liquids presenting properties coinciding with the volatile part of the atomizer liquid are: Spray-drying of milk; sodium phosphate or yeast where the sealing liquid is water; or spray-drying of antibiotics dissolved in ethanole where the sealing liquid is ethanole.
  • Liquids containing or comprising ingredients killing undesired micro-organisms examples are: Spray-drying of an aqueous solution of dextrane where the sealing liquid is ethanole.
  • the invention has been described with reference to a preferred embodiment. Many modifications can be carried out without thereby deviating from the scope of the invention.
  • the sealing means adjacent the shaft 28 can for instance be accommodated between the shaft 28 and the atomizer body 1.

Landscapes

  • Nozzles (AREA)

Abstract

La présente invention concerne un atomiseur centrifuge pourvu d'un volant atomiseur (29) monté sur un arbre mené (28) et définissant une chambre d'accélération (35) où le liquide est introduit dans la chambre d'accélération via un élément de distribution stationnaire annulaire (30) et une ouverture annulaire correspondante (27) dans le volant atomiseur. Le liquide s'éjecte sous forme d'un nuage de gouttelettes depuis le volant atomiseur (29) au travers d'orifices (16) distribués circulairement. Un élément de fermeture étanche est associé à des passages (36, 37) ménagés entre les éléments de distribution (30) et chacun des côtés de l'ouverture correspondante (27) dans le volant atomiseur (29). L'élément de fermeture étanche comprend une nervure circulaire stationnaire (40, 41) débordant radialement dans une certaine quantité d'un liquide de fermeture étanche situé dans une rainure annulaire (38, 39). Cette rainure annulaire est conçue pour tourner en même temps que le volant atomiseur (29), des organes assurant le remplissage ainsi que l'évacuation de ce liquide de fermeture étanche pendant le fonctionnement.
EP00909066A 1999-03-11 2000-03-10 Atomiseur centrifuge Expired - Lifetime EP1159075B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DKPA199900344 1999-03-11
DK34499 1999-03-11
PCT/DK2000/000101 WO2000053333A1 (fr) 1999-03-11 2000-03-10 Atomiseur centrifuge

Publications (2)

Publication Number Publication Date
EP1159075A1 true EP1159075A1 (fr) 2001-12-05
EP1159075B1 EP1159075B1 (fr) 2003-08-06

Family

ID=8092470

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00909066A Expired - Lifetime EP1159075B1 (fr) 1999-03-11 2000-03-10 Atomiseur centrifuge

Country Status (4)

Country Link
EP (1) EP1159075B1 (fr)
DE (1) DE60004330D1 (fr)
DK (1) DK1159075T3 (fr)
WO (1) WO2000053333A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GR1003825B (el) * 2001-03-29 2002-02-26 Φυγοκεντρικη γεννητρια του αεροζολ
AT506722B1 (de) 2008-04-21 2011-01-15 Kronsteiner Martin Ing Ausbringgerät

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4275838A (en) * 1977-09-12 1981-06-30 Ransburg Corporation Rotating atomizing device
FR2412351A1 (fr) * 1977-12-20 1979-07-20 Air Ind Projecteur electrostatique de peinture a bol ou a disque tournant avec un joint d'etancheite pneumatique
DE3912700C1 (en) * 1989-04-18 1990-10-11 Ransburg-Gema Gmbh, 6056 Heusenstamm, De Rotary spray coater - has atomiser ring with solvent channels, and includes annular air inlets
DE9419641U1 (de) * 1994-12-07 1995-02-02 Dürr GmbH, 70435 Stuttgart Rotationszerstäuber mit einem Glockenkörper

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0053333A1 *

Also Published As

Publication number Publication date
EP1159075B1 (fr) 2003-08-06
DK1159075T3 (da) 2003-12-01
WO2000053333A1 (fr) 2000-09-14
DE60004330D1 (de) 2003-09-11

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