EP0341145A1 - Luftzerstäubungsgerät für Flüssigkeiten - Google Patents
Luftzerstäubungsgerät für Flüssigkeiten Download PDFInfo
- Publication number
- EP0341145A1 EP0341145A1 EP89401231A EP89401231A EP0341145A1 EP 0341145 A1 EP0341145 A1 EP 0341145A1 EP 89401231 A EP89401231 A EP 89401231A EP 89401231 A EP89401231 A EP 89401231A EP 0341145 A1 EP0341145 A1 EP 0341145A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- air
- channels
- air ejection
- ejection channels
- channel
- 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
Images
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
Definitions
- the invention relates to a pneumatic liquid spraying device, in particular for applying paint or varnish; its main purpose is to obtain a better conformation of the beam of sprayed liquid and a greater ease of adjustment of the characteristics of this beam, making it possible to quickly adapt the latter to changes or variations in the conditions of flow rate, temperature and viscosity liquid to be sprayed.
- a device for spraying liquid using compressed air both to transform the liquid into a bundle of fine particles and to give this bundle a desired shape, more particularly a relatively flat fan shape, of cross section d thickness as constant as possible.
- Such a device is, for example, described in US Patent No. 2,646,314.
- This prior device comprises a spray nozzle at the center of which are arranged a liquid ejection channel and a drive air ejection channel , annular and coaxial with said liquid ejection channel.
- the nozzle has a number of air ejection channels which, by virtue of their respective main functions will be called atomizing air ejection channels and beam shaping air ejection channels.
- Said spraying area ejection channels are arranged symmetrically on either side of the axis of the liquid ejection channel and converge towards a point on this axis (which will be called for convenience "spraying point” ) located downstream of the liquid ejection orifice, to disperse the liquid jet in fine droplets.
- Said shaping air channels are also arranged symmetrically on either side of this axis and converge two by two towards the latter, downstream of the spray point, that is to say towards a location where the jet of liquid is already sprayed. To do this, these channels are formed in two horns projecting from the surface of the nozzle on which the liquid ejection channel opens. These horns are symmetrical with respect to the axis of the channel.
- the action of the "conformation area” is therefore to flatten the beam of sprayed liquid to give it the desired fan shape.
- at least all of the channels opening onto the face of the nozzle in the center of which is the orifice of said liquid ejection channel are supplied from the same source of compressed air.
- the internal orifices of these channels all open into the same annular cavity arranged around the liquid ejection channel and connected to a compressed air inlet.
- the conformation air ejection channels, located in the horns, are generally supplied separately, that is to say connected to another supply of compressed air, of a different pressure.
- the air ejected by the horns mainly makes it possible to adjust the width of the flat jet while the air ejected by the drive channels and the spray channels acts on another important parameter, namely the fineness spray.
- the actions of all these air jets interfere, which makes adjustments difficult, long and tedious.
- the fan beam may be thinned, or even cut in the center, where the action of air from the horns is predominant and on the other hand, the spray becomes finer. It is therefore advisable to correct these variations by reducing in parallel the spraying air flow and consequently the driving air flow, which has new consequences on the shape of the beam and therefore obliges the operator to proceed by successive approaches.
- the invention results from the observation that, in this type of device, the spraying air also contributes to the conformation of the sprayed beam and to the distribution of the sprayed liquid, transverse to the axis of the beam (ie ie in the "plane" of the fan) while the drive air has practically no effect on these parameters.
- the drive air intervenes directly on the forward speed component, communicated to the particles of the sprayed liquid and therefore on the opening of the fan. Consequently, the invention proposes modifications in the supply of the various air ejection channels defined above, in order to make the settings of the main characteristic parameters of the beam relatively independent of each other.
- the invention therefore relates to a pneumatic liquid spraying device comprising a spray nozzle in the center of which is arranged a liquid ejection channel and further comprising spray air ejection channels and at at least one drive air ejection channel formed coaxially and parallel to said liquid ejection channel and opening onto a front face of said nozzle, characterized in that said spray air ejection channels opening onto said front face, said drive air ejection channel is independent of the others channels mentioned and is arranged to be supplied with compressed air by a specific air source at a pressure generally different from that (s) of the other cited air ejection channels.
- the invention consists first of all in dissociating the setting of the supply air of the drive air ejection channel from the other settings. This can therefore lead, in accordance with the invention, to providing three sources of compressed air at different pressures which can be adjusted independently of one another: a source of air for said drive air ejection channel, a source air for said atomizing air ejection channels and an air source for said beam shaping air ejection channels, that is to say the air ejected by the aforementioned horns.
- the invention however particularly relates to an embodiment where the number of compressed air sources is limited to two, which allows, on the one hand, to connect the device to conventional and / or pre-existing installations and, on the other hand, to further facilitate adjustments while unexpectedly improving performance.
- said beam-shaping air is dependent on the atomizing air.
- the invention therefore also relates to a device according to the above definition, characterized in that said spray air ejection channels and said beam shaping air ejection channels communicate.
- the liquid spraying device 11 comprises a body 12 of which an approximately cylindrical part has been shown and in which are defined a number of conduits capable of being placed in communication with a liquid inlet 13 (in particular paint or varnish ), a first compressed air inlet 14 and a second compressed air inlet 15.
- a spray nozzle 16 is fixed to one end of the body 12, by means of a threaded sleeve 17.
- the liquid inlet 13 is here represented by a conduit which opens into a chamber 13 a ; this duct is connected to a source of pressurized liquid, not shown.
- the body 12 houses an air control needle 18 slidably mounted along an axis x′x. It should be noted that the three chambers 13 a , 14 a , 15 a are aligned along this axis which is also the axis of ejection of the liquid.
- the needle 18 has two frustoconical bearing surfaces 14 b , 15 b controlling the communication of the chambers 14 a , 15 a with air distribution ducts 20, 21, respectively.
- a paint control needle 22 is also slidably mounted along the axis x′x. It moves partly in the needle 18 and partly in the body 12. It controls the connection of the chamber 13 a with a paint distribution conduit 25 defined axially (always along the axis x′x in an insert 26.
- the latter is interposed axially between one end of the body 12 and the spray nozzle 16 and is screwed into a threaded part of said body.
- a liquid spray nozzle 28 terminated by a liquid ejection channel 30 which projects through the spray nozzle, in the center thereof.
- the axis of this channel is of course, the x′x axis.
- the spray nozzle has two horns 35, symmetrical with respect to the axis x′x, parallel and projecting on the sides of a front face 36, substantially circular, at the center of which opens the liquid ejection channel 30 , through an orifice 30 a .
- Air ejection channels are provided in the spray nozzle.
- a drive area ejection channel 38 of annular section and arranged coaxially and parallel to the liquid ejection channel 30.
- This channel 38 therefore opens, through an annular orifice 38 a on the circular face 36; of course, this single annular channel could be replaced by several channels parallel to channel 30 and distributed regularly over a cylindrical surface, - Spray air ejection channels 39, oblique to the axis x′x and whose ejection axes converge at A on this axis, downstream of the orifice 30 a , with respect to the direction ejecting the liquid; the orifices 39 a of these channels also open onto the circular face 36, - Air ejection channels of conformation of the beam 40, formed in the horns 35, oblique with respect to the axis x′x and arranged in pairs; they are located in a plane P, containing the axis x′x and the orifices 40 a
- the plane PM containing the axis x′x and perpendicular to the plane P is defined as being the desired median plane of the fan beam 45 of sprayed liquid.
- the air ejection channels mentioned above, in particular channels 39 and 40 carry for convenience the names that they are conventionally given although the analysis developed above tends to demonstrate that their action is significantly more complex.
- the drive air ejection channel 38 (or the channels fulfilling this function) is independent of the others and designed to be supplied with compressed air at a pressure generally different from that (s ) other air ejection channels.
- said spray air ejection channels 39 and said conformation air ejection channels 40 and 41 communicate.
- the internal orifices of the channels 40 open into conduits 48 formed in the horns 35, and communicate with said first air inlet 14 (via an annular chamber 49 defined between the insert 26 and the sleeve 17 and in which opens the conduit 20), the internal orifices of the channels 39 and 41 open into a first cavity 50 defined in the spray nozzle and the conduits 48 communicate with the cavity 50 by holes 52 made obliquely in the horns 35.
- the internal orifice of the drive air ejection channel opens into a second cavity 55 in communication with said second compressed air inlet 15, via an annular chamber 56 defined at the junction of the spray nozzle 16 and of the insert 26, of the channels 57 made through the insert 26, another annular chamber 58 defined at the junction of the insert 26 and of the body 12, the channel 21 opening into this chamber 58.
- This second cavity 55 is partially delimited by a part of revolution 60 of generally conical shape, inserted between the spray nozzle 16 and the insert 26.
- This part of revolution 60 forms a partition wall between said first cavity 50 and said second cavity 55.
- C ' is the presence of this part which makes it possible to "dissociate" the drive air from the spraying air and / or conformation.
- the use of the device which has just been described is very different from that of known devices and in particular the adjustments are simpler and faster.
- the fineness of spraying only depends on the adjustment of the air flow rate coming from the conformation air ejection channels 40 and 41 and the spray air channels 39, that is to say the setting of the air pressure applied to the air inlet 14.
- the shape of the beam is practically determined and “stabilized” by construction by suitably choosing the sections of the different air ejection channels.
- the opening of the fan is, for its part, directly regulated by the air flow rate coming from the drive channel 38. This adjustment can be carried out independently of the others and no variation in the other parameters of the spray. This adjustment is therefore done simply by acting on the air pressure applied to the air inlet 15.
Landscapes
- Nozzles (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8805926A FR2630930B1 (fr) | 1988-05-03 | 1988-05-03 | Dispositif de pulverisation pneumatique de liquide |
FR8805926 | 1988-05-03 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0341145A1 true EP0341145A1 (de) | 1989-11-08 |
EP0341145B1 EP0341145B1 (de) | 1992-07-01 |
Family
ID=9365938
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP89401231A Expired - Lifetime EP0341145B1 (de) | 1988-05-03 | 1989-04-28 | Luftzerstäubungsgerät für Flüssigkeiten |
Country Status (5)
Country | Link |
---|---|
US (1) | US4961536A (de) |
EP (1) | EP0341145B1 (de) |
JP (1) | JPH01317563A (de) |
DE (1) | DE68901951T2 (de) |
FR (1) | FR2630930B1 (de) |
Families Citing this family (24)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NO171427C (no) * | 1990-05-25 | 1993-03-10 | Trallfa Robot Abb As | Regulerbar styreventil for stroemningsregulering av gass eller vaeske samt anvendelse av saadan ventil |
US5421921A (en) * | 1992-07-08 | 1995-06-06 | Nordson Corporation | Segmented slot die for air spray of fibers |
ES2115700T3 (es) * | 1992-07-08 | 1998-07-01 | Nordson Corp | Aparato y procedimientos para la aplicacion de coberturas discretas. |
US5322221A (en) * | 1992-11-09 | 1994-06-21 | Graco Inc. | Air nozzle |
US5307992A (en) * | 1992-11-18 | 1994-05-03 | Usbi Co. | Method and system for coating a substrate with a reinforced resin matrix |
US6322003B1 (en) | 1999-06-11 | 2001-11-27 | Spraying Systems Co. | Air assisted spray nozzle |
US6161778A (en) * | 1999-06-11 | 2000-12-19 | Spraying Systems Co. | Air atomizing nozzle assembly with improved air cap |
US6267301B1 (en) | 1999-06-11 | 2001-07-31 | Spraying Systems Co. | Air atomizing nozzle assembly with improved air cap |
US6685106B1 (en) | 2000-11-28 | 2004-02-03 | Efc Systems, Inc. | Paint spraying device |
US7114910B2 (en) | 2003-01-24 | 2006-10-03 | Turbotect Ltd. | Method and injection nozzle for interspersing a gas flow with liquid droplets |
US6874708B2 (en) * | 2003-02-13 | 2005-04-05 | Illinois Tool Works Inc. | Automatic air-assisted manifold mounted gun |
JP4409910B2 (ja) * | 2003-10-31 | 2010-02-03 | 日本ペイント株式会社 | スプレー塗装装置および塗装方法 |
TW200536612A (en) * | 2004-03-26 | 2005-11-16 | Graco Minnesota Inc | Air spray gun improvements in nozzle and aircap |
US7237727B2 (en) * | 2004-04-13 | 2007-07-03 | Hsing-Tzu Wang | Paint spray gun |
US20050263612A1 (en) * | 2004-05-26 | 2005-12-01 | Hsing-Tzu Wang | Paint spray gun |
US20060249289A1 (en) * | 2005-05-05 | 2006-11-09 | Halliburton Energy Services, Inc. | Set-delayed cement compositions comprising hydrated lime and silica and methods of cementing in subterranean formations |
WO2008096501A1 (ja) | 2007-02-08 | 2008-08-14 | Abb K.K. | エア霧化型塗装装置 |
US8297530B2 (en) * | 2007-09-21 | 2012-10-30 | Spraying Systems Co. | Ultrasonic atomizing nozzle with variable fan-spray feature |
US8104694B2 (en) * | 2008-02-05 | 2012-01-31 | Chih-Yuan Yang | Air spray gun |
US9790132B2 (en) | 2012-03-09 | 2017-10-17 | Halliburton Energy Services, Inc. | Set-delayed cement compositions comprising pumice and associated methods |
US10082001B2 (en) | 2012-03-09 | 2018-09-25 | Halliburton Energy Services, Inc. | Cement set activators for cement compositions and associated methods |
JP5935134B2 (ja) * | 2012-05-18 | 2016-06-15 | 国立研究開発法人産業技術総合研究所 | 噴霧ノズルの構造 |
JP2013244429A (ja) * | 2012-05-24 | 2013-12-09 | Nissan Motor Co Ltd | 塗装ハンドガン用エアキャップ |
AR103483A1 (es) * | 2015-02-28 | 2017-05-10 | Halliburton Energy Services Inc | Un método para pulverizar o recubrir una superficie con una composición de cemento con retardo de fraguado y sistema de cementación |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE434163A (de) * | ||||
FR1524334A (fr) * | 1967-03-31 | 1968-05-10 | Prosyn | Appareil perfectionné pour la pulvérisation de tous liquides |
EP0224066A2 (de) * | 1985-11-26 | 1987-06-03 | Binks Manufacturing Company | Spritzpistole zum pneumatischen Zerstäuben |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2070696A (en) * | 1935-12-11 | 1937-02-16 | Vilbiss Co | Spray head |
US2646314A (en) * | 1950-10-19 | 1953-07-21 | Vilbiss Co | Spray nozzle |
US4501394A (en) * | 1983-05-09 | 1985-02-26 | Graco Inc. | Spray gun air cap and method of making |
FR2595059B1 (fr) * | 1986-02-28 | 1988-06-17 | Sames Sa | Dispositif de pulverisation de liquide |
DE3709543C2 (de) * | 1987-03-24 | 1996-06-05 | Wagner Gmbh J | Vorrichtung zum Zerstäuben einer Flüssigkeit |
-
1988
- 1988-05-03 FR FR8805926A patent/FR2630930B1/fr not_active Expired - Fee Related
-
1989
- 1989-04-28 DE DE8989401231T patent/DE68901951T2/de not_active Expired - Lifetime
- 1989-04-28 EP EP89401231A patent/EP0341145B1/de not_active Expired - Lifetime
- 1989-05-02 JP JP1112332A patent/JPH01317563A/ja active Pending
- 1989-05-02 US US07/346,614 patent/US4961536A/en not_active Expired - Fee Related
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE434163A (de) * | ||||
FR1524334A (fr) * | 1967-03-31 | 1968-05-10 | Prosyn | Appareil perfectionné pour la pulvérisation de tous liquides |
EP0224066A2 (de) * | 1985-11-26 | 1987-06-03 | Binks Manufacturing Company | Spritzpistole zum pneumatischen Zerstäuben |
Also Published As
Publication number | Publication date |
---|---|
FR2630930A1 (fr) | 1989-11-10 |
DE68901951T2 (de) | 1992-12-24 |
EP0341145B1 (de) | 1992-07-01 |
FR2630930B1 (fr) | 1990-11-02 |
US4961536A (en) | 1990-10-09 |
DE68901951D1 (de) | 1992-08-06 |
JPH01317563A (ja) | 1989-12-22 |
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