EP2004331B1 - Tetes de pistolets pulverisateurs - Google Patents

Tetes de pistolets pulverisateurs Download PDF

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Publication number
EP2004331B1
EP2004331B1 EP07732013A EP07732013A EP2004331B1 EP 2004331 B1 EP2004331 B1 EP 2004331B1 EP 07732013 A EP07732013 A EP 07732013A EP 07732013 A EP07732013 A EP 07732013A EP 2004331 B1 EP2004331 B1 EP 2004331B1
Authority
EP
European Patent Office
Prior art keywords
spray
delivery
fluid
orifice
spray head
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.)
Not-in-force
Application number
EP07732013A
Other languages
German (de)
English (en)
Other versions
EP2004331A1 (fr
Inventor
Barry Lyon
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.)
BWI PLC
Original Assignee
BWI PLC
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 BWI PLC filed Critical BWI PLC
Publication of EP2004331A1 publication Critical patent/EP2004331A1/fr
Application granted granted Critical
Publication of EP2004331B1 publication Critical patent/EP2004331B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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
    • B05B7/08—Spray pistols; Apparatus for discharge with separate outlet orifices, e.g. to form parallel jets, i.e. the axis of the jets being parallel, to form intersecting jets, i.e. the axis of the jets converging but not necessarily intersecting at a point
    • B05B7/0807—Spray pistols; Apparatus for discharge with separate outlet orifices, e.g. to form parallel jets, i.e. the axis of the jets being parallel, to form intersecting jets, i.e. the axis of the jets converging but not necessarily intersecting at a point to form intersecting jets
    • B05B7/0815—Spray pistols; Apparatus for discharge with separate outlet orifices, e.g. to form parallel jets, i.e. the axis of the jets being parallel, to form intersecting jets, i.e. the axis of the jets converging but not necessarily intersecting at a point to form intersecting jets with at least one gas jet intersecting a jet constituted by a liquid or a mixture containing a liquid for controlling the shape of the latter
    • 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
    • B05B15/50—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter
    • 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
    • B05B7/06—Spray pistols; Apparatus for discharge with at least one outlet orifice surrounding another approximately in the same plane
    • B05B7/062—Spray pistols; Apparatus for discharge with at least one outlet orifice surrounding another approximately in the same plane with only one liquid outlet and at least one gas outlet
    • B05B7/066—Spray pistols; Apparatus for discharge with at least one outlet orifice surrounding another approximately in the same plane with only one liquid outlet and at least one gas outlet with an inner liquid outlet surrounded by at least one annular gas outlet

Definitions

  • This invention relates to spray gun heads.
  • Spray guns are used for spaying fluid solutions in the food, agricultural, pharmaceutical and similar industries.
  • Such spray guns generally have a spray delivery head that has a central nozzle for say a coating fluid, an orifice for introducing atomising air to the fluid to produce a spray plume and additional orifices for air to control the pattern of spray plume.
  • Document US6494387 discloses a spray head according to the preamble of claim 1.
  • the atomising air orifice is an annulus surrounding a projecting fluid delivery nozzle and control fluid orifices are provided either side of the central nozzle in angled faces of the spray head, so that the central nozzle is in a trough.
  • a drawback with this arrangement is that there is a tendency for droplets of the fluid to fall back and adhere to surfaces of the nozzle body, which is known as bearding.
  • This droplet build up continues whilst spraying leading to a loss in nozzle performance including blockage.
  • the build up of droplets can solidify and break off and fall into and contaminate the process. This results from the presence of low-pressure zones adj acent to the outlet orifices due to the sudden geometrical enlargement, through which the escaping air is emitted.
  • These low-pressure zones generate recirculating eddy currents in the air flow, which entrain fluid droplets and deliver them onto the local external faces of the spray head adjacent to the orifices and annulus. Over time these droplets stick to each other forming the undesirable build up mainly in the nozzle region.
  • An object of this invention is to provide a spray nozzle for a multiple fluid spray gun, which at least reduces the effect of bearding.
  • a spray head for a multiple fluid atomiser spray gun has all the features of claim 1.
  • Spray heads of the invention are preferably made of metal or of plastics material may be served to a spray gun by means of a locking collar or nut.
  • a spray head 10 for a multiple fluid atomiser spray gun has a body 12 having a circular base 14 for mounting on a spray gun apparatus and sloping faces 16 leading to a narrow spray delivery face 18.
  • the body 12 has a central passage 20 for delivery of coating fluid to a delivery nozzle 22 end part only and for delivery of atomising fluid though an annular orifice 24 surrounding the main fluid delivery nozzle.
  • the nozzle 22 for the coating fluid protrudes beyond the spray face 18, which enables interaction of air and fluid streams beyond the spray face helping to inhibit atomised fluid droplets being picked up by air currents in the vicinity of the face.
  • At the tip of the nozzle 22 its outer edge is chamfered at 23 to reduce a low pressure zone at the nozzle tip.
  • Figure 5 of the drawings shows the zone of low pressure at 25.
  • a conventional nozzle has a generally square tip, which creates a larger low pressure zone at the nozzle tip.
  • the orifices 26, 28 are served by bores 30, 32 respectively, which are interconnected via an annular channel 34 in the base of the spray head.
  • Annular wall 36, which separates the passage 20 from the channel 34 serves to locate the spray head relative to the spray gun apparatus.
  • the spray head may be of metal or plastics material.
  • a coating fluid is delivered via the nozzle 22 and air delivered through the annular orifice 24 atomises the coating fluid to create a spray plume, which is generally conical in shape (see particularly Figure 5 ).
  • the spray pattern controlling fluid orifices 26, 28 deliver air from either side of the coating fluid spray plume to change the shape of the spray plume to being of generally oval section in order to control the area of delivery of the coating fluid.
  • the coating fluid is applied to tablets in the pharmaceutical industry.
  • the spray delivery face 18 is shaped in the region of the delivery nozzle 22 and the orifices 24, 26 and 28 in order to allow atomising air and spray pattern controlling air to drive droplets of main fluid from the region to inhibit bearding.
  • the part of the face surrounding the annular orifice is dish shaped (38) and at opposite ends of the dish the face 40 slopes down to the spray shaping fluid orifices at 26 and 28. Smooth transitions between the dish 38 at opposite ends and the respective slopes 40 are shown at 42.
  • the sides of the dish 38 and the sloping faces 40 are generally at less than 90° to the axes of their respective orifices, so that the air from those orifices tends to drive any droplets of the coating fluid from the delivery face in the region of the nozzle and orifices.
  • the spray face 18 of the spray head is so profiled in the region of the main coating fluid nozzle, atomising fluid annulus and spray pattern controlling orifices that the escaping air is provided with a gradual geometrical enlargement as defined by the dish 38, slopes 40 and smooth transitions 42.
  • the effect of the gradual geometrical enlargement is a gradual air release (as opposed to a sudden release) in that the air does not form recirculating eddy currents and thus little or no entrapment of coating fluid droplets back onto the spray face occurs.
  • Figure 5 illustrates the atomising air plume 50 emitted from the annular orifice 24, the spray pattern controlling air plume 52 emitted from orifices 26 and 28 and the zone of interaction between both air plumes 50 and 52 to provide a combined air plume 54.
  • the air streams shown as 50 and 52 keep the local external surfaces free from droplets, which would otherwise stick to the surfaces and cause bearding.
  • Broken line 56 represents the typical shape of existing nozzle designs. Considering the likely shape of the air plumes as they emerge from orifices 26 and 28 it is probable that a low pressure zone is created in the region between these orifices and the annular orifice, which generates recirculating eddy currents in the air-flow, which entrain small droplets back onto the spray face adjacent to the orifices 24, 26 and 28.
  • the invention eliminates this low pressure zone with solid material as shown at 58, which then through geometrical form provides a gradual geometrical enlargement which has the effect of eliminating the recirculating eddy currents normally produced with a face shown by the line 56.
  • Figure 8 shows the sloping faces 16, which provide a path for spray plume replenishing air 60 to enter the vicinity of the orifices 24, 26 and 28 and replace air consumed by the air plumes 50 and 52.
  • shallow angled faces illustrated by line 62 do not allow replenishing air 60 to enter the vicinity of the atomising and pattern air outlets akin to orifices 24, 26 and 28 creating low-pressure zones that result in bearding.

Landscapes

  • Nozzles (AREA)
  • Coating By Spraying Or Casting (AREA)

Claims (13)

  1. Tête de pulvérisation (10) pour un pistolet pulvérisateur atomiseur de fluides multiples, comprenant une face de distribution d'un fluide de pulvérisation (18), comportant une buse de distribution d'un fluide principal (22) et un orifice de distribution d'un fluide à atomisation (24) qui y est associé, la face de distribution du fluide de pulvérisation (18) étant formée de sorte à entraîner des gouttelettes dudit fluide principal à l'écart de la face de distribution du fluide de pulvérisation (18) en atomisant le fluide à partir de l'orifice de distribution du fluide à atomisation (24), dans lequel
    la buse de distribution du fluide principal (22) est entourée par l'orifice annulaire de distribution de fluide à atomisation (24), caractérisée en ce que la face de distribution du fluide de pulvérisation entourant cet orifice a la forme d'une cavité allongée (38), comportant une surface continue à partir de laquelle déborde la buse de distribution du fluide principal (22).
  2. Tête de pulvérisation (10) selon la revendication 1, dans laquelle la buse de distribution du fluide principal (22) déborde au-delà de l'orifice annulaire (24).
  3. Tête de pulvérisation (10) selon les revendications 1 ou 2, dans laquelle la face de distribution du fluide de pulvérisation (18), agencée vers l'extérieur de l'orifice de distribution du fluide à atomisation (24) et adjacente à celui-ci, forme un angle de moins de 90° par rapport à l'axe de l'orifice.
  4. Tête de pulvérisation (10) selon l'une quelconque des revendications 1 à 3, comportant un ou plusieurs orifices (26, 28) pour distribuer un fluide contrôlant le motif de la pulvérisation, en vue de former la pulvérisation de fluide atomisé.
  5. Tête de pulvérisation (10) selon la revendication 4, dans laquelle la face de distribution du fluide de pulvérisation (18) est formée de sorte à entraîner des gouttelettes dudit fluide principal à l'écart de la face de distribution du fluide de pulvérisation dans la région de l'orifice ou des orifices de distribution contrôlant le motif de pulvérisation (26, 28).
  6. Tête de pulvérisation (10) selon la revendication 5, dans laquelle le ou chaque orifice de distribution du fluide de formage (26, 28) comporte un axe pour distribuer son fluide à travers la pulvérisation atomisée du fluide principal.
  7. Tête de pulvérisation (10) selon les revendications 5 ou 6, dans laquelle la face de distribution du fluide de pulvérisation (18), située vers l'intérieur de ou de chaque orifice de formage du fluide (26, 28), forme un angle inférieur à 90° par rapport à l'axe de l'orifice.
  8. Tête de pulvérisation (10) selon l'une quelconque des revendications 1 à 7, comportant une base généralement circulaire (14) et une paire de côtés inclinés opposés (16) orientés vers la face de distribution du fluide de pulvérisation (18).
  9. Tête de pulvérisation (10) selon l'une quelconque des revendications 1 à 8, comportant un passage généralement central (20) menant vers la buse de distribution du fluide principal (22) et la buse de distribution du fluide atomisé associée (24).
  10. Tête de pulvérisation (10) selon l'une quelconque des revendications 4 à 9, dans laquelle le ou chaque orifice de distribution du fluide contrôlant le motif de pulvérisation (26, 28) est alimenté à travers son propre alésage (30, 32).
  11. Tête de pulvérisation (10) selon la revendication 10, dans laquelle, en cas de présence de plus d'un orifice de distribution du fluide contrôlant le motif pulvérisation (26, 28), les alésages correspondants (30, 32) sont interconnectés.
  12. Tête de pulvérisation (10) selon la revendication 11, dans laquelle les alésages (30, 32) sont interconnectés par l'intermédiaire d'un passage annulaire (34).
  13. Tête de pulvérisation (10) selon l'une quelconque des revendications 1 à 12, dans laquelle, au niveau des extrémités opposées de la cavité allongée (38), la face de distribution (18) est inclinée vers le bas vers un orifice de distribution d'un fluide contrôlant le motif de pulvérisation (26, 28).
EP07732013A 2006-03-14 2007-03-14 Tetes de pistolets pulverisateurs Not-in-force EP2004331B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB0605105.6A GB0605105D0 (en) 2006-03-14 2006-03-14 Spray gun heads
PCT/GB2007/000871 WO2007104967A1 (fr) 2006-03-14 2007-03-14 Tetes de pistolets pulverisateurs

Publications (2)

Publication Number Publication Date
EP2004331A1 EP2004331A1 (fr) 2008-12-24
EP2004331B1 true EP2004331B1 (fr) 2011-08-03

Family

ID=36292718

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07732013A Not-in-force EP2004331B1 (fr) 2006-03-14 2007-03-14 Tetes de pistolets pulverisateurs

Country Status (4)

Country Link
EP (1) EP2004331B1 (fr)
AT (1) ATE518601T1 (fr)
GB (1) GB0605105D0 (fr)
WO (1) WO2007104967A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105107653B (zh) 2009-01-26 2018-01-09 3M创新有限公司 液体喷枪、喷枪平台和喷头组件
US9751100B2 (en) 2011-02-09 2017-09-05 3M Innovative Properties Company Nozzle tips and spray head assemblies for liquid spray guns
WO2013016474A1 (fr) * 2011-07-28 2013-01-31 3M Innovative Properties Company Ensemble de tête de pulvérisation à buse/capuchon d'air intégré pour un pistolet de pulvérisation de liquide
RU2574755C2 (ru) 2011-10-12 2016-02-10 3М Инновейтив Пропертиз Компани Агрегаты головки распылителя для жидкостных пистолетов-распылителей
EP4000744A1 (fr) 2012-03-06 2022-05-25 3M Innovative Properties Co. Pistolet de pulvérisation à conduit de surcompression interne
KR102111467B1 (ko) 2012-03-23 2020-05-15 쓰리엠 이노베이티브 프로퍼티즈 컴파니 분리불가능 노즐을 갖는 스프레이 건 배럴
EP3021982B1 (fr) 2013-07-15 2020-02-26 3M Innovative Properties Company Anneaux déflecteurs à inserts à géométrie de coupe pour pistolets pulvérisateurs de liquide
GB201812072D0 (en) * 2018-07-24 2018-09-05 Carlisle Fluid Tech Uk Ltd Spray gun nozzle

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2924174C2 (de) * 1979-06-15 1984-04-19 Heinrich Bühnen KG Maschinenfabrik, Im- und Export, 2800 Bremen Verfahren und Düse eines Gerätes zum Aufbringen eines Klebers auf ein Substrat
DE69928944T2 (de) * 1999-06-30 2006-09-07 Anest Iwata Corp., Yokohama Niederdruck-spritzpistole
SE524216C2 (sv) * 2001-12-14 2004-07-13 Haakan Emilsson Spruthuvud med konvext välvd frontsköld med luftmunstycken
JP2005527361A (ja) * 2002-05-28 2005-09-15 ケルサン テクノロジーズ コープ． 噴霧ノズル組立体
AU2003279969A1 (en) * 2002-10-15 2004-05-04 Spraying Systems, Co. External mix air assisted spray nozzle assembly
DE102005034519A1 (de) * 2005-07-20 2007-01-25 J. Wagner Gmbh Auftragsvorrichtung

Also Published As

Publication number Publication date
GB0605105D0 (en) 2006-04-26
ATE518601T1 (de) 2011-08-15
EP2004331A1 (fr) 2008-12-24
WO2007104967A1 (fr) 2007-09-20

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