EP2004331A1 - Tetes de pistolets pulverisateurs - Google Patents
Tetes de pistolets pulverisateursInfo
- Publication number
- EP2004331A1 EP2004331A1 EP07732013A EP07732013A EP2004331A1 EP 2004331 A1 EP2004331 A1 EP 2004331A1 EP 07732013 A EP07732013 A EP 07732013A EP 07732013 A EP07732013 A EP 07732013A EP 2004331 A1 EP2004331 A1 EP 2004331A1
- 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.)
- Granted
Links
- 239000007921 spray Substances 0.000 title claims abstract description 138
- 239000012530 fluid Substances 0.000 claims abstract description 105
- 238000007493 shaping process Methods 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 description 12
- 238000000576 coating method Methods 0.000 description 12
- 230000003134 recirculating effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000003993 interaction Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
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.
- Such 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.
- 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 adjacent 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. It has been proposed to make the face of a spray gun nozzle completely flat but this does not prevent bearding.
- 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 a spray delivery face having a main fluid delivery nozzle and an atomising fluid delivery orifice associated therewith, wherein the spray delivery face is shaped to cause droplets of said main fluid to be driven away from the spray delivery face by atomising fluid from the atomising fluid delivery orifice.
- the atomising fluid delivery orifice is an annular orifice around the main fluid delivery nozzle. More preferably the main fluid delivery nozzle projects beyond the annular orifice.
- the spray delivery face outwardly of and adjacent to the atomising fluid delivery orifice preferably is at an angle of less than 90° to the axis of the orifice.
- a spray head for a multiple fluid atomiser spray gun has a spray delivery face having an atomised fluid delivery system and one or more orifices for delivery of fluid to control the spray pattern, wherein the spray delivery face is shaped to cause droplets of said main fluid to be driven away from the spray delivery face by spray pattern controlling fluid.
- each spray pattern controlling fluid delivery orifice has an axis at the angle to deliver its fluid across the first fluid spray.
- the spray delivery face inwards of the or each spray pattern controlling fluid orifice is at an angle of less than 90° to the axis of the orifice.
- the atomised fluid delivery system of the second aspect of the invention is an atomising fluid delivery system of the first aspect of the invention.
- the spray head preferably has a generally circular base and a pair of opposed sides sloping towards to the spray delivery face.
- the spray head preferably has a generally central passage leading to the main fluid delivery nozzle and the associated atomising fluid delivery nozzle.
- the or each spray pattern controlling fluid delivery orifice is supplied through its own bore. Where more than one spray pattern controlling fluid delivery orifice is provided, their bores may be interconnected such as by means of an annular passage.
- the main fluid delivery nozzle is surrounded by an annular atomising fluid delivery orifice and the surrounding spray delivery face is in the form of a dish.
- the delivery face slopes down to a spray pattern controlling fluid delivery orifice.
- 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.
- Figure 1 is a side view of a spray nozzle according to the invention
- Figure 2 is a plan view of the spray nozzle of Figure 1 ;
- Figure 3 is a section on line AA of Figure 2;
- Figure 4 shows the spray nozzle of Figure 1 from above the side
- Figure 5 is a sectional view of the spray nozzle of Figure 1 showing spray patterns
- Figure 6 is another side view of the spray nozzle of Figure 1;
- Figure 7 is a view from below and one side of the spray nozzle of Figure 1 ;
- Figure 8 is an end view of the spray nozzle of Figure 1.
- 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)
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 true EP2004331A1 (fr) | 2008-12-24 |
EP2004331B1 EP2004331B1 (fr) | 2011-08-03 |
Family
ID=36292718
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07732013A Active 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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2389255B1 (fr) | 2009-01-26 | 2017-01-11 | 3M Innovative Properties Company | Pistolet de pulvérisation, plate-forme de pulvérisation, et tête de pulvérisation |
WO2012109298A1 (fr) | 2011-02-09 | 2012-08-16 | 3M Innovative Properties Company | Buses et ensembles têtes de pulvérisation pour pistolets de pulvérisation de liquide |
CN103717314B (zh) * | 2011-07-28 | 2017-02-15 | 3M创新有限公司 | 用于液体喷枪的具有一体化气帽/喷嘴的喷雾头组件 |
AU2012323301B2 (en) | 2011-10-12 | 2016-03-24 | 3M Innovative Properties Company | Spray head assemblies for liquid spray guns |
CN104284736B (zh) | 2012-03-06 | 2018-02-02 | 3M创新有限公司 | 具有内部提升通道的喷枪 |
US11167298B2 (en) | 2012-03-23 | 2021-11-09 | 3M Innovative Properties Company | Spray gun barrel with inseparable nozzle |
RU2638399C2 (ru) | 2013-07-15 | 2017-12-13 | 3М Инновейтив Пропертиз Компани | Пневмоколпачки с фигурными вставками для жидкостных пистолетов-распылителей |
GB201812072D0 (en) * | 2018-07-24 | 2018-09-05 | Carlisle Fluid Tech Uk Ltd | Spray gun nozzle |
Family Cites Families (6)
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 |
EP1108476B1 (fr) * | 1999-06-30 | 2005-12-14 | Anest Iwata Corporation | Pistolet a peinture a basse pression |
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 |
US20060097070A1 (en) * | 2002-10-15 | 2006-05-11 | Spraying Systems Co. | External mix air assisted spray nozzle assembly |
DE102005034519A1 (de) * | 2005-07-20 | 2007-01-25 | J. Wagner Gmbh | Auftragsvorrichtung |
-
2006
- 2006-03-14 GB GBGB0605105.6A patent/GB0605105D0/en not_active Ceased
-
2007
- 2007-03-14 EP EP07732013A patent/EP2004331B1/fr active Active
- 2007-03-14 WO PCT/GB2007/000871 patent/WO2007104967A1/fr active Application Filing
- 2007-03-14 AT AT07732013T patent/ATE518601T1/de not_active IP Right Cessation
Non-Patent Citations (1)
Title |
---|
See references of WO2007104967A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2007104967A1 (fr) | 2007-09-20 |
ATE518601T1 (de) | 2011-08-15 |
EP2004331B1 (fr) | 2011-08-03 |
GB0605105D0 (en) | 2006-04-26 |
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