WO2005035138A1 - Pulverspritzpistole - Google Patents
Pulverspritzpistole Download PDFInfo
- Publication number
- WO2005035138A1 WO2005035138A1 PCT/CH2003/000676 CH0300676W WO2005035138A1 WO 2005035138 A1 WO2005035138 A1 WO 2005035138A1 CH 0300676 W CH0300676 W CH 0300676W WO 2005035138 A1 WO2005035138 A1 WO 2005035138A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- powder
- air
- gun
- channel
- flow
- Prior art date
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
- B05B5/03—Discharge apparatus, e.g. electrostatic spray guns characterised by the use of gas, e.g. electrostatically assisted pneumatic spraying
- B05B5/032—Discharge apparatus, e.g. electrostatic spray guns characterised by the use of gas, e.g. electrostatically assisted pneumatic spraying for spraying particulate materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
- B05B1/26—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means with means for mechanically breaking-up or deflecting the jet after discharge, e.g. with fixed deflectors; Breaking-up the discharged liquid or other fluent material by impinging jets
- B05B1/262—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means with means for mechanically breaking-up or deflecting the jet after discharge, e.g. with fixed deflectors; Breaking-up the discharged liquid or other fluent material by impinging jets with fixed deflectors
- B05B1/265—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means with means for mechanically breaking-up or deflecting the jet after discharge, e.g. with fixed deflectors; Breaking-up the discharged liquid or other fluent material by impinging jets with fixed deflectors the liquid or other fluent material being symmetrically deflected about the axis of the nozzle
Definitions
- Powder spray gun The present invention relates to a gun for electrostatic powder spraying, with a conveying channel for supplying powder from a reservoir for gun outlet by means of a main air flow, the powder-air mixture ionized by means of high voltage being formed into a powder cloud at the gun outlet.
- Such powder spray guns are known in a wide variety of embodiments.
- air particles molecules
- the part to be coated is set to a counter potential, so that the powder particles adhere to the named part.
- Such conventional powder spray guns generally have a power connection (for generating the high voltage), a powder feed and an air feed and, of course, a gun outlet for the powder cloud generated.
- the powder is conveyed via an injector, where the powder is conveyed in a hose or channel at a speed of approx. 18 m / s, which means that the powder has a sufficient speed at the gun outlet.
- the air flow used for powder delivery and the air supply are also used to clean the impact body or the slit gland.
- the object of the present invention is to provide a powder spray gun which achieves improved powder atomization and in which an improved powder cloud can be created.
- This object is achieved according to the invention in a powder spray gun of the type defined at the outset by the features of the characterizing part of claim 1.
- Particular embodiments of the invention are defined in the dependent claims.
- the essence of the invention thus lies in the supply of additional air which is used for improved powder atomization, regulation of the powder cone size, acceleration of the powder to the required (optimized) speed and, as a side effect, for automatic cleaning of the nozzle.
- the high voltage necessary for the ionization can be generated inside or outside the impact body.
- the powder spray gun designed according to the invention can be used as a hand-held device or automatic device.
- FIG. 1 shows a purely schematic section through the head of a powder spray gun according to the invention with an impact body;
- Fig. 2 shows the front head part of Fig. 1, somewhat enlarged, and
- Fig. 3 shows a variant of the gun of Fig. 1 with slot nozzle.
- the powder spray gun designed according to the invention the powder is sucked in under vacuum and transported further as a powder-air mixture. This results in a much higher density, ie more powder in relation to the air. Thanks to this increase in the powder quantity to the (transport) air quantity, the transport speed of the powder can be reduced (the conveying speed is approx. 6 m / s).
- the powder at the gun outlet must be accelerated.
- This additionally introduced air not only serves to accelerate the powder, but above all to improve the mixing and atomization of the powder, i.e. a much more homogeneous powder cloud can be generated.
- the additional air flow (s) can be individually regulated depending on the requirement (type of powder, application) (separate air sources, i.e. pumps). Thanks to the additional air (via one or more additional air channels), the effect of the ionizing high voltage is also better distributed.
- FIG. 1 of the drawing shows the head of a powder spray gun 1 designed according to the invention.
- a powder-air mixture passes through the main air duct 2
- Round jet nozzle 3 the mixture exiting at 4 and being formed into a powder cone 6 by the impact body 5.
- additional channels 7, 7 ' can separately supply air at an increased speed in order to accelerate the powder-air flow in the round duct 2 'for the first time.
- the most important additional air duct 8 is located inside the nozzle 3 on the gun axis (air enters the duct 8 via a side feed 8 ′).
- the known electrode 9 for ionizing the mixture can end immediately before the end of the impact body 5 or, leading through an end seal 5 ', outside.
- speed emerges through two different round gaps 9 'and hits the powder cloud 6 in order to accelerate it and mix the powder again (before it hits the object to be coated).
- a further outlet of additional air can take place at 10.
- FIG. 3 shows a variant of a pistol according to the invention with a slot nozzle (exit slot 11 to the front). Accelerating air and air are mixed in here for mixing / atomization at points 7, 12 to 14.
- the supply of additional air can be regulated independently of the main air flow.
Landscapes
- Electrostatic Spraying Apparatus (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2003266909A AU2003266909A1 (en) | 2003-10-16 | 2003-10-16 | Powder spraying pistol |
PCT/CH2003/000676 WO2005035138A1 (de) | 2003-10-16 | 2003-10-16 | Pulverspritzpistole |
EP03747793A EP1673175A1 (de) | 2003-10-16 | 2003-10-16 | Pulverspritzpistole |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/CH2003/000676 WO2005035138A1 (de) | 2003-10-16 | 2003-10-16 | Pulverspritzpistole |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2005035138A1 true WO2005035138A1 (de) | 2005-04-21 |
Family
ID=34427739
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/CH2003/000676 WO2005035138A1 (de) | 2003-10-16 | 2003-10-16 | Pulverspritzpistole |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1673175A1 (de) |
AU (1) | AU2003266909A1 (de) |
WO (1) | WO2005035138A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2009005930A1 (en) * | 2007-06-29 | 2009-01-08 | Illinois Tool Works Inc. | Powder gun deflector |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0801993A2 (de) * | 1996-04-17 | 1997-10-22 | Toyota Jidosha Kabushiki Kaisha | Rotierende elektrostatische Sprühvorrichtung |
EP0878238A1 (de) * | 1996-12-03 | 1998-11-18 | ABB Industry K.K. | Beschichtungsvorrichtung mit einem rotierenden sprühkopf |
US5954275A (en) * | 1997-04-02 | 1999-09-21 | Toyota Jidosha Kabushiki Kaisha | Rotary atomizing electrostatic coating apparatus |
US20020170580A1 (en) * | 2001-05-16 | 2002-11-21 | Clifford Scott J. | Method and apparatus for cleaning a bell atomizer spray head |
-
2003
- 2003-10-16 EP EP03747793A patent/EP1673175A1/de not_active Withdrawn
- 2003-10-16 AU AU2003266909A patent/AU2003266909A1/en not_active Abandoned
- 2003-10-16 WO PCT/CH2003/000676 patent/WO2005035138A1/de active Application Filing
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0801993A2 (de) * | 1996-04-17 | 1997-10-22 | Toyota Jidosha Kabushiki Kaisha | Rotierende elektrostatische Sprühvorrichtung |
EP0878238A1 (de) * | 1996-12-03 | 1998-11-18 | ABB Industry K.K. | Beschichtungsvorrichtung mit einem rotierenden sprühkopf |
US5954275A (en) * | 1997-04-02 | 1999-09-21 | Toyota Jidosha Kabushiki Kaisha | Rotary atomizing electrostatic coating apparatus |
US20020170580A1 (en) * | 2001-05-16 | 2002-11-21 | Clifford Scott J. | Method and apparatus for cleaning a bell atomizer spray head |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2009005930A1 (en) * | 2007-06-29 | 2009-01-08 | Illinois Tool Works Inc. | Powder gun deflector |
US8371517B2 (en) | 2007-06-29 | 2013-02-12 | Illinois Tool Works Inc. | Powder gun deflector |
US8888018B2 (en) | 2007-06-29 | 2014-11-18 | Illinois Tool Works Inc. | Powder gun deflector |
Also Published As
Publication number | Publication date |
---|---|
EP1673175A1 (de) | 2006-06-28 |
AU2003266909A1 (en) | 2005-04-27 |
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