EP1358015A1 - Pulv risateur tribo lectrique - Google Patents
Pulv risateur tribo lectriqueInfo
- Publication number
- EP1358015A1 EP1358015A1 EP02702455A EP02702455A EP1358015A1 EP 1358015 A1 EP1358015 A1 EP 1358015A1 EP 02702455 A EP02702455 A EP 02702455A EP 02702455 A EP02702455 A EP 02702455A EP 1358015 A1 EP1358015 A1 EP 1358015A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- powder
- air
- duct
- triboelectric
- charging
- 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
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
- B05B5/025—Discharge apparatus, e.g. electrostatic spray guns
- B05B5/047—Discharge apparatus, e.g. electrostatic spray guns using tribo-charging
Definitions
- the present invention relates to a triboelectric sprayer, for spraying electrostatic powder paint.
- the principle of a triboelectric sprayer, for spraying electrostatic powder paint and the following:
- the paint in the form of insulating powder, conveyed by so-called transport air, is electrostatically charged by friction on an insulating material, capable of removing electrons from it, so that the powder charges positively.
- a triboelectric sprayer operating according to this principle, comprises:
- the insulating material ensuring by friction the electrostatic charge of the powder, forms the wall of the aforementioned conduit, which conveys the air and the powder.
- This insulating material is electrically connected to the earth by junctions between components of the sprayer, so that it remains globally electrically neutral, its charge continuously flowing, by "creeping" (surface flow), towards the outlet. earthen.
- creeping surface flow
- EP 0163118, EP 0199054, EP 0314049, EP 0592137 and EP 0818245 can also be cited here, as well as international patent applications WO 88/08332, WO 92/11950 and WO 98 / 25707.
- triboelectric sprayers comprise, as a charging conduit, an annular space, relatively elongated, delimited by parts against which the powder, conveyed by the air, will rub and charge.
- the annular charge duct is delimited internally by a central core which, advantageously, has a wavy profile in profile (see in particular the aforementioned documents EP 0314049 (FIG. 3), EP 0592127 and
- the central core is held inside an external body, externally delimiting the load conduit, by centering elements mounted at each end of said conduit.
- This central core may have a conical end on the side of the inlet of the charging conduit, so as to distribute the powder in the annular space forming this conduit; the other end of the central core, located on the side of the outlet of the charging conduit, can also be conical, in order to collect the charged powder, before sending it into small outlet channels, belonging to or associated with the means emitting air-powder mixture jets, these means being in practice constituted by a nozzle.
- an air inlet is produced along the central axis of this sprayer.
- an additional air inlet and if necessary of powder, is arranged orthogonal to the central axis of the sprayer, upstream of the inlet cone of the charge duct - see for example the aforementioned documents EP 0592137 and EP 0818245.
- the presence of an "orthogonal" injection means, forming an obstacle, creates disturbances; in particular, it is the cause of premature wear, and / or accumulations of powder at the breakpoint.
- the earthing in particular of the central core of the charging conduit, requires the addition of parts which complicate the assembly; this earthing is generally done at the outer periphery and towards the rear of the sprayer body. Taking into account the forces and the electric fields implemented by the created charges, it is frequent to note strikes between the interior part of the sprayer, and its grounding zone, which lead to replacing more or less frequently parts which are not, in themselves, wearing parts.
- the present invention aims to avoid all these drawbacks of current triboelectric sprayers, by providing an air and powder supply system which prevents wear and accumulation of powder, while simplifying the earthing.
- the triboelectric sprayer which is the subject of the invention, of the type indicated in the introduction, it is provided that:
- the air inlet is located in the axis of the charge duct
- the powder inlet is arranged laterally, and converges at an acute angle with the air inlet, at a point located upstream of the charge duct.
- the powder inlet converging with the air inlet, is constituted by a powder duct which opens onto the rear face of the sprayer, which reduces the bulk and facilitates connections.
- the charging conduit is a conduit of non-constant circular section, with successive restrictions, the point of convergence of the powder and air inlets being located upstream of the first load line restriction.
- the choice of such a charging conduit can have advantages, in comparison with a charging conduit of annular section, in particular in the sense of a certain constructive simplification (elimination of the central core) and of an improvement in operation (elimination of the risk of blockage of the annular space by the powder).
- the invention remains compatible with a triboelectric sprayer in which the charging conduit is an annular section conduit, comprising a central core with rear cone, in which case the point of convergence of the powder and air inlets is located upstream of the tip of said cone.
- section restrictions provided along the charging conduit, make it possible to create zones of impact of the powder on the insulating material ensuring the charge. More particularly, in the case where the charge conduit has an annular section, this annular section is not constant, with successive restrictions.
- a throttling zone is advantageously provided, ending in a homogenization chamber from which the means for emitting at least one jet of air-powder mixture are supplied. This last restriction allows to accelerate the mixture of air and powder, in order to resuspend the powder homogeneously, before its distribution in the outlet channels.
- the axial air inlet is constituted by an injector of electrically conductive material, also constituting a grounding member. This arrangement simplifies the implementation of the earthing function, the electrical charges taken from the powder flowing through the air injector.
- Figure 1 is a side view, exterior, of a triboelectric sprayer according to the present invention
- Figure 2 is an end view, from the rear, of the triboelectric sprayer of Figure 1;
- Figure 3 is a longitudinal sectional view of this sprayer, according to ffl-III of Figure 2;
- Figure 4 is another view in longitudinal section, according to IN-IN of Figure 2;
- Figure 5 is a longitudinal sectional view, similar to Figure 3, of a variant of this triboelectric sprayer.
- the triboelectric sprayer shown in Figures 1 to 4 and generally designated by the reference 1, comprises a main body 2, of general tubular conformation with a central axis indicated in 3, in which is placed an elongated block 4 of insulating material, delimiting a charging conduit 5 centered on the axis 3.
- the charging conduit 5 is of circular section.
- an injection base 6 is provided, mechanically connected to said body 2 by means of a screwable connection sleeve 7, and with interposition of centering pins 8.
- the base of injection 6 is itself mechanically connected, by means of a fixing pin 9, to the end of a movable arm 10 (partially shown) belonging to a painting robot, the sprayer 1 being carried and moved by the robot arm 10.
- an air injector 11 is disposed in the junction zone between the charging duct 4, 5 and the base 6, and along the central axis 3, and is disposed an air injector 11.
- This injector 11 is made of electrically conductive material, and also with a good coefficient of friction, such as graphitized polytetrafluoroethylene (PTFE), and it is earthed.
- PTFE graphitized polytetrafluoroethylene
- connection 13 for the arrival of air-powder mixture is also mounted in the injection base 6, parallel to the central axis 3, therefore in lateral position, relative to the air injector 11.
- the connection 13 opens out. thus on the rear face 14 of the base 6.
- the connector 13 is extended, at the front, by a short oblique channel 15, which converges at an acute angle A, at a point P, with the inlet of the conduit charge 4, 5, just downstream of the air injector 11.
- the air injector 11 makes it possible to agitate the air-powder mixture which opens into the inlet of the charge duct 4, 5 through the oblique channel 15.
- the assembly makes it possible to create, in the charge duct 4, 5, a turbulent and rapid flow, avoiding any laminar flow which would have the effect of reducing the friction necessary for the electrostatic charge of the powder.
- FIG. 5 At the downstream end of the charging duct 4, 5 is an outlet cone 17, which makes it possible to distribute the air-powder mixture (charged) in outlet channels 18, formed in an ejection nozzle 19 fixed to the 'front of the sprayer 1.
- the nozzle 19 itself receives an outlet plug 20, the configuration of which depends on the type of jet desired at the outlet of the sprayer, for example a flat jet.
- Figure 5 in which the components corresponding to those previously described are designated by the same references, shows a variant of the triboelectric sprayer 1 object of the invention.
- an air injector 11 located in the central axis 3 of the sprayer 1, and a connection 13 for the arrival of the air-powder mixture, disposed laterally and extended by an oblique channel. 15, which converges at a point P with the outlet of the air injector 11, forming an acute angle A with the axis 3.
- FIG. 5 comprises a charging duct 5 of annular section (and not circular), which is delimited externally by a tube 21, and internally by a central core 22, the tube 21 and the central core 22 being coaxial and centered on the axis 3.
- the central core 22 has a rear cone 22a, located downstream of the point P of convergence of the oblique channel 15 with the outlet of the air injector 11.
- the charging duct 5 has here, too, successive restrictions (not detailed in FIG. 5) which give it a decreasing annular section, from upstream to downstream.
- the central core 22 also includes a front cone 22b, surrounded by a throttling zone 23 which extends the charging duct 5, with a decreasing section, and which opens into a central homogenization chamber 24. Downstream of this chamber d '' homogenization 24, there is an outlet cone 17 which distributes the air-powder mixture (charged) in outlet channels 18 of an ejection nozzle 19, itself provided with an outlet plug 20 for example arranged to emit a flat jet.
Landscapes
- Electrostatic Spraying Apparatus (AREA)
- Nozzles (AREA)
- Bidet-Like Cleaning Device And Other Flush Toilet Accessories (AREA)
- Reciprocating Pumps (AREA)
- Fertilizers (AREA)
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0101737A FR2820344B1 (fr) | 2001-02-08 | 2001-02-08 | Pulverisateur triboelectrique |
FR0101737 | 2001-02-08 | ||
PCT/FR2002/000437 WO2002062487A1 (fr) | 2001-02-08 | 2002-02-05 | Pulvérisateur triboélectrique |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1358015A1 true EP1358015A1 (fr) | 2003-11-05 |
EP1358015B1 EP1358015B1 (fr) | 2007-06-27 |
Family
ID=8859796
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02702455A Expired - Lifetime EP1358015B1 (fr) | 2001-02-08 | 2002-02-05 | Pulvérisateur triboélectrique |
Country Status (10)
Country | Link |
---|---|
US (1) | US6959884B2 (fr) |
EP (1) | EP1358015B1 (fr) |
JP (1) | JP2004526557A (fr) |
KR (1) | KR20030076622A (fr) |
AT (1) | ATE365587T1 (fr) |
BR (1) | BR0206675A (fr) |
CA (1) | CA2435955C (fr) |
DE (1) | DE60220880T2 (fr) |
FR (1) | FR2820344B1 (fr) |
WO (1) | WO2002062487A1 (fr) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8783585B2 (en) * | 2009-05-20 | 2014-07-22 | General Electric Company | Methods and systems for mixing reactor feed |
DE202013011934U1 (de) | 2012-04-13 | 2014-11-27 | Nordson Corporation | Pulverpistole, die zum Zuführen von einer Venturi- oder Dichtstrompumpe konfigurierbar ist |
CN113000238A (zh) * | 2021-03-09 | 2021-06-22 | 马鞍山星苗智能装备有限公司 | 静电式摩擦喷枪 |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4114564A (en) * | 1963-06-13 | 1978-09-19 | Ransburg Corporation | Electrostatic coating apparatus |
DE3420325A1 (de) | 1984-05-30 | 1985-12-05 | Ransburg-Gema AG, St.Gallen | Spruehvorrichtung zum beschichten von gegenstaenden mit pulver |
DE3514523A1 (de) | 1985-04-22 | 1986-10-23 | Ransburg-Gema AG, St. Gallen | Verfahren und vorrichtung zum elektrostatischen beschichten von gegenstaenden mit pulverfoermigem beschichtungsmaterial |
DE3529703C1 (de) * | 1985-08-20 | 1986-08-28 | Ransburg-Gema AG, St. Gallen | Spruehvorrichtung zur elektrostatischen Pulverbeschichtung |
DE3600808A1 (de) * | 1986-01-14 | 1987-07-16 | Esb Voehringer | Elektrostatische pulverspruehvorrichtung mit triboelektrischer pulveraufladung |
SE460643B (sv) | 1987-04-28 | 1989-11-06 | Ac Greiff Ytbehandling Ab | Anordning vid pulverspruta med en laangstraeckt ringformig uppladdningskanal |
DD271611A3 (de) | 1987-10-27 | 1989-09-13 | Verkehrswesen Hochschule | Spruehpistole mit elektrokinetischer pulveraufladung |
WO1992011949A1 (fr) | 1991-01-11 | 1992-07-23 | Jason Industries Limited | Systeme de charge de poudre |
US5344082A (en) | 1992-10-05 | 1994-09-06 | Nordson Corporation | Tribo-electric powder spray gun |
US5622313A (en) * | 1995-03-03 | 1997-04-22 | Nordson Corporation | Triboelectric powder spray gun with internal discharge electrode and method of powder coating |
FR2750897B1 (fr) | 1996-07-10 | 1998-09-18 | Sames Sa | Projecteur triboelectrique, installation de projection de produit de revetement et procede de commande d'un tel projecteur |
SE9604521L (sv) | 1996-12-09 | 1998-04-20 | Nordson Sverige Ab | Anordning för applicering av elektriskt laddade partiklar på en yta |
US6082628A (en) * | 1999-05-14 | 2000-07-04 | Board Of Trustees Of The University Of Arkansas | Powder charger and sprayer |
-
2001
- 2001-02-08 FR FR0101737A patent/FR2820344B1/fr not_active Expired - Fee Related
-
2002
- 2002-02-05 CA CA2435955A patent/CA2435955C/fr not_active Expired - Fee Related
- 2002-02-05 DE DE60220880T patent/DE60220880T2/de not_active Expired - Lifetime
- 2002-02-05 KR KR10-2003-7009687A patent/KR20030076622A/ko not_active Application Discontinuation
- 2002-02-05 WO PCT/FR2002/000437 patent/WO2002062487A1/fr active IP Right Grant
- 2002-02-05 AT AT02702455T patent/ATE365587T1/de not_active IP Right Cessation
- 2002-02-05 JP JP2002562483A patent/JP2004526557A/ja active Pending
- 2002-02-05 EP EP02702455A patent/EP1358015B1/fr not_active Expired - Lifetime
- 2002-02-05 US US10/467,539 patent/US6959884B2/en not_active Expired - Fee Related
- 2002-02-05 BR BR0206675-0A patent/BR0206675A/pt not_active IP Right Cessation
Non-Patent Citations (1)
Title |
---|
See references of WO02062487A1 * |
Also Published As
Publication number | Publication date |
---|---|
BR0206675A (pt) | 2004-01-13 |
US6959884B2 (en) | 2005-11-01 |
FR2820344A1 (fr) | 2002-08-09 |
ATE365587T1 (de) | 2007-07-15 |
FR2820344B1 (fr) | 2003-03-14 |
US20040069870A1 (en) | 2004-04-15 |
CA2435955C (fr) | 2010-04-20 |
DE60220880D1 (de) | 2007-08-09 |
EP1358015B1 (fr) | 2007-06-27 |
JP2004526557A (ja) | 2004-09-02 |
WO2002062487A1 (fr) | 2002-08-15 |
KR20030076622A (ko) | 2003-09-26 |
CA2435955A1 (fr) | 2002-08-15 |
DE60220880T2 (de) | 2008-03-13 |
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