EP1475159A1 - Dispositif de revêtement de poudre par pulvérisation - Google Patents

Dispositif de revêtement de poudre par pulvérisation Download PDF

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Publication number
EP1475159A1
EP1475159A1 EP04007899A EP04007899A EP1475159A1 EP 1475159 A1 EP1475159 A1 EP 1475159A1 EP 04007899 A EP04007899 A EP 04007899A EP 04007899 A EP04007899 A EP 04007899A EP 1475159 A1 EP1475159 A1 EP 1475159A1
Authority
EP
European Patent Office
Prior art keywords
holes
coating material
spraying device
air
flow path
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
Application number
EP04007899A
Other languages
German (de)
English (en)
Other versions
EP1475159B1 (fr
Inventor
Felix Mauchle
Hanspeter Michael
Hanspeter Vieli
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.)
Gema Switzerland GmbH
Original Assignee
Gema Switzerland GmbH
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 Gema Switzerland GmbH filed Critical Gema Switzerland GmbH
Publication of EP1475159A1 publication Critical patent/EP1475159A1/fr
Application granted granted Critical
Publication of EP1475159B1 publication Critical patent/EP1475159B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B05B7/14—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 designed 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
    • 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
    • B05B5/04—Discharge apparatus, e.g. electrostatic spray guns characterised by having rotary outlet or deflecting elements, i.e. spraying being also effected by centrifugal forces
    • B05B5/0418—Discharge apparatus, e.g. electrostatic spray guns characterised by having rotary outlet or deflecting elements, i.e. spraying being also effected by centrifugal forces designed for spraying particulate material
    • 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
    • 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
    • B05B5/04—Discharge apparatus, e.g. electrostatic spray guns characterised by having rotary outlet or deflecting elements, i.e. spraying being also effected by centrifugal forces
    • B05B5/0403—Discharge apparatus, e.g. electrostatic spray guns characterised by having rotary outlet or deflecting elements, i.e. spraying being also effected by centrifugal forces characterised by the rotating member
    • B05B5/0407—Discharge apparatus, e.g. electrostatic spray guns characterised by having rotary outlet or deflecting elements, i.e. spraying being also effected by centrifugal forces characterised by the rotating member with a spraying edge, e.g. like a cup or a bell
    • 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
    • B05B5/04—Discharge apparatus, e.g. electrostatic spray guns characterised by having rotary outlet or deflecting elements, i.e. spraying being also effected by centrifugal forces
    • B05B5/0426—Means for supplying shaping gas

Definitions

  • the invention relates to a spray device for coating material, in particular Coating powder, according to the preamble of claim 1.
  • the invention relates to a spray device which has at least one High voltage electrode for electrostatically charging the Has coating material.
  • a spray device which has at least one High voltage electrode for electrostatically charging the Has coating material.
  • it can also be used for sprayers, which are not designed for the electrostatic charging of coating material are.
  • Sprayers of this type are known, e.g. B. from US 4,324,361, DE 34 12 694 A1, US 4,505,430, US 4,196,465, US 4,347,984 and US 6,189,804.
  • a disadvantage of sprayers with an annular gap as a shaping air outlet is that itself then when the gap in the longitudinal direction of the gap at several points between the is supported both parts forming it, not uniformly large can be, for technical manufacturing reasons. Then this disadvantage is not given if holes are used instead of an annular gap, especially when the body in which the bores are formed is on the drilling site is undivided.
  • Such sprayers show e.g. B. EP 0 767 005 B1, EP 0 744 998 B1 and DE 34 31 785 C2.
  • the object of the invention is to be achieved with less amount of shaping air per unit of time an equally good or better efficiency in terms of Effect on the coating material spray stream and also in relation to the Coating quality and with regard to the coating required To achieve the amount of coating material.
  • the invention relates to a spraying device for coating material, in particular coating powder containing a coating material channel; a spray outlet at the downstream end of the coating material channel for spraying the coating material onto an object to be coated; one Shaping air outlet for shaping compressed air, which is close to the Spray outlet and the flow path of the coating material extends around separated from the flow path, and is designed to one of the compressed air To generate coating air spray enveloping molding air flow; the shaping air outlet through a large plurality of holes in one Body is formed, which around the flow path of the coating material, separated from this, arranged around and forward to the Show coating material spray jet, characterized in that a Ambient air passage spaced radially inward relative to the holes is provided offset, which is from a behind the body in which the Holes are formed, located in front of the ambient air entry point Body, in which the holes are formed, located air outlet point and in one piece or in the form of several openings around the flow path of the Coating material, separated from this flow path, extends around that ambient air from the
  • the spray device shown in Figs. 1 and 2 is for spraying Coating powder formed, but could instead for spraying liquid coating material.
  • the sprayer contains a coating material channel 2; a spray outlet 4 at the downstream end of the coating material channel 2 for spraying the Coating material 6 in the form of a coating material spray stream 8 an object to be coated (not shown); and a shaping air outlet 10 for Forming compressed air 12, which is close to the spray outlet 8 Flow path of the coating material 6, separated from the flow path extends and is configured to form one of the compressed air 12 Coating material spray 8 enveloping forming air flow 11 produce.
  • the shaping air outlet 10 is formed by a large number of holes 14, which extend through an undivided body 16 at the holes and around the Flow path of the coating material 6, separate from this flow path, are distributed around.
  • the holes 14 are each the same Circumferential distance 18 from each other circularly concentric about the axial central axis 20 of the flow path of the coating material 6 arranged around.
  • the circumferential distance 18 between the holes 14 is so small that they are out of them escaping shaping air jets 22 by radial expansion into an im Cross-section annular flow of shaping air flow together, preferably immediately after the holes 14 even before they hit the spray stream 8, at the latest, however, at the point of impact on the spray stream 8.
  • the holes 14 are forwards in the coating material spray direction directed, preferably parallel to the axial central axis 20, and preferably in an end face pointing forward. According to another embodiment they can also be directed obliquely to the axial central axis 20, either against pointing her or away from her. By the direction of the holes 14 relative to the axial The central axis 20 and the pressure strength of the compressed air 12 can Cross-sectional shape and cross-sectional size of the spray stream 8 can be set.
  • At least one or more electrodes, z. B. 23, 24 and / or 25 arranged for electrostatic charging of the Coating material 6 is connected to a high voltage generator 26 or are.
  • the high voltage generator 26 can be external to the sprayer or 1 in the sprayer. He creates from one AC voltage a higher DC voltage, for example in the range can be between 4 kV and 150 kV.
  • the sprayer has one Low-voltage AC voltage connection 28 for the supply of Low-voltage alternating voltage to the high-voltage generator 26; one Coating material connection 30 for supplying coating material to the Coating material channel 2; and a molding air port 32 for Supply of molding compressed air 12 to a manifold 34 which has the holes 14 connects on their upstream.
  • each hole 14 there are at least ten or more holes 14, for example at least twenty, thirty or forty, or any number.
  • the circumferential distance 18 of the holes 14 from one another is at least a factor of two or more than the opening size 38 of the holes 14 in the circumferential direction around the axial central axis 20.
  • the factor preferably has a larger value, for example the value five or more, for example ten or more.
  • the opening cross section of each hole 14 is less than 2.0 mm 2 , for example less than 1.0 mm 2 or more preferably less than 0.5 mm 2 or less than 0.3 mm 2 .
  • the aim is to make the holes as small as possible, as is technically practical, in order to thereby generate a fast-flowing, high-energy shaping air jet 22 at each hole 14 with the smallest possible amount of shaping air flow per unit time, and from this an energetic shaping air stream 11.
  • an effective influence on the cross-sectional shape and cross-sectional size of the spray stream 8 is achieved with a small amount of air per unit time. Due to the very small cross-sectional size of the individual holes 14, an equal amount of shaping air flow per unit of time is achieved at all holes even if all holes 14 have the same cross-section and the distribution channel 34 has a constant cross-sectional size over its entire length.
  • the small cross-sectional size of the holes 14 results in an even distribution of air pressure over the entire length of the distributor channel 34.
  • the sum of the total cross-sectional sizes of all holes 14 is smaller, e.g. B. only half as large as the flow cross section of the distribution channel 34.
  • the holes 14 preferably each have a cross section which is circular in cross section, can also have a different cross-section, for example an angular one Cross-sectional shape.
  • the holes 14 can in the manufacture of the body 16, in which they are formed during the body manufacturing process are, for example by injection molding processes for the production of the body 16 and simultaneously making the holes 14. According to another preferred In the embodiment, the holes 14 are formed in the body 16 by drilling.
  • the Body 16 may be made of a rigid material, such as a metal tube or consist of a plastic tube, or of an elastic or flexible Material, e.g. B. a hose, e.g. B. made of rubber or plastic.
  • FIGS. 1 and 2 show an embodiment in which the body 16 is a hose or is a pipe in which the holes 14 are drilled and the like Hose interior or tube interior forms the distribution channel 34.
  • the body 16 can be a part of the housing 40 or a part of the housing 40 of the spray device 2 be attached housing part, or according to FIGS. 1 and 2, an additional body 16.
  • This additional body 16 is attached to the housing 40 of the sprayer, can, however, also be attached to another element which is attached to the Housing 40 is attached, for example on a front end piece 42, which forms or contains the spray outlet 4 and is attached to the housing 40.
  • the outlet end of holes 14 is relative moved back to the spray outlet 4 upstream.
  • the embodiment could have the outlet end of holes 14 in the same Transverse plane or downstream of the transverse plane, in which also the Spray outlet 4 is located. It is essential that the shaping air flow 11 is the spray flow 8 so close to the spray outlet 4 that no coating material particles the coating material flow radially outwards or backwards on the Outer peripheral surfaces of the sprayer can escape.
  • the holes 14 can be done with much greater accuracy in a predetermined Size can be produced as in the circumferential direction around the axial central axis 20 extending column. Furthermore, there is less of a risk of holes Changes in size due to temperature influences and external mechanical Influences, for example blows from hitting other objects.
  • the body 16, which is provided with the holes 14, is through one or more Elements 44, preferably webs with spaces between them, directly or attached to the housing 40 via intermediate elements, so that the body 16 of the housing 40 is worn.
  • a Ambient air passage 50 radially spaced relative to the holes 14 provided offset inside, which is from a behind the body 16, which the Has holes 14, ambient air entry point 52 extending to a front of the Body 16 located air outlet 54 and which extends in the form of a , or multiple slots or other openings around the flow path of the Coating material 6, separate from this flow path, and thus around the axial central axis 20 extends around, so that ambient air 56 from the rear air inlet point 52 to the front air outlet point 54 through the Ambient air passage 50 can be sucked through by the suction effect of the Coating material spray stream 8 and / or by the suction of Shaping compressed air jets 22 and the shaping air flow 11.
  • This Ambient air passage 50 prevents backflow of Coating material particles on the outer surfaces of the sprayer and its Body 16 containing holes 14. This will contaminate these parts prevented.
  • all holes 14 have through the compressed air distribution channel 34 with a compressed air inlet opening 62 with one another Flow connection.
  • two or more groups of such holes 14 through a portion of the Distribution channel 34 have flow communication with each other, the sections are separated from each other in terms of flow and each section has its own Compressed air inlet opening 62 has. This enables a finer adjustment of the from Holes 14 exiting amount of compressed air per unit of time preferably in that the same amount of compressed air per unit time from all holes flows out, or according to another embodiment defined different Flow out compressed air quantities per unit of time.
  • the opening cross section of the distribution channel 34 (or its separate sections) and the opening cross sections of the Holes 14 matched to one another in such a way that all holes 14 are the same Compressed air volume can flow out per time unit.
  • the holes 14 The amount of compressed air escaping per unit of time depends on the flow resistance in the distribution channel 34 between the inlet opening 62 and the relevant hole 14.
  • An equal amount of compressed air per unit time can be achieved in all holes 14 can be achieved that either the distribution channel 34 in the direction of nearest hole 14 to the distant hole 14 an increasing has smaller resistance or preferably in that the holes with increasing distance from the compressed air inlet opening 62 an increasing have a larger opening cross-section.
  • the hole 14 which the shortest flow path from the inlet opening 62 is the smallest Opening cross-section, and the most distant hole 14 the largest Opening cross section.
  • such measures are technically complex and expensive. They can also be used in the invention.
  • the Invention the opening cross-sections in the manner mentioned so small that too without such measures, an equal amount of shaping air flow at all holes 14 is achieved per unit of time.
  • All embodiments of the invention are suitable for all types of sprayers for coating material, in particular for powder coating material, for example for sprayers with a spray outlet in the form of a Round jet or flat jet, with cylindrical or funnel-like shape, with or without impact body 60 or baffle, and also for sprayers whose Spray outlet 4 provided with a rotary body or by such is formed.
  • the invention is also suitable for corona sprayers at which on the at least one high-voltage electrode 23, 24, 25 Corona discharges are generated, and also for so-called tribo-sprayers, in which the electrostatic charge of the spray coating material particles is generated by friction thereof in the coating material channel 2.
  • the invention enables a homogeneous air distribution of the forming compressed air the spray stream 8 around. For this, only a small amount of compressed air per unit of time needed.
  • the shaping air flow 11 generated according to the invention has one stabilizing effect on the spray stream 8, which is more in the form of a Spray cloud as a spray has.
  • This spray stream is 8 or spray cloud much less sensitive to air currents in a coating booth than in the state of the art. This has the further advantage that the Application efficiency of the coating powder on an object to be coated and the coating quality, e.g. B. coating uniformity, significantly increased become.
  • Sprayers of this type are commonly used as a spray gun or spray gun referred to, both with a handle for manual operation are provided, as well as when they are as straight or angular automatic pistols are formed, which are held by a device, for. B. from one Robot; Lifting stand or fixed carrier.

Landscapes

  • Electrostatic Spraying Apparatus (AREA)
  • Nozzles (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
EP04007899A 2003-05-05 2004-04-01 Dispositif de revêtement de poudre par pulvérisation Expired - Lifetime EP1475159B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10319916A DE10319916A1 (de) 2003-05-05 2003-05-05 Sprühgerät für Beschichtungsmaterial, insbesondere Beschichtungspulver
DE10319916 2003-05-05

Publications (2)

Publication Number Publication Date
EP1475159A1 true EP1475159A1 (fr) 2004-11-10
EP1475159B1 EP1475159B1 (fr) 2006-08-30

Family

ID=32981211

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04007899A Expired - Lifetime EP1475159B1 (fr) 2003-05-05 2004-04-01 Dispositif de revêtement de poudre par pulvérisation

Country Status (13)

Country Link
US (1) US7478763B2 (fr)
EP (1) EP1475159B1 (fr)
JP (1) JP2004330190A (fr)
KR (1) KR100636003B1 (fr)
CN (1) CN1572376A (fr)
AT (1) ATE337857T1 (fr)
AU (1) AU2004201870B2 (fr)
CA (1) CA2466245C (fr)
DE (2) DE10319916A1 (fr)
ES (1) ES2271728T3 (fr)
NZ (1) NZ532761A (fr)
PT (1) PT1475159E (fr)
TW (1) TWI278353B (fr)

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EP1844175B1 (fr) * 2005-01-26 2008-08-20 Volvo Aero Corporation Procede et dispositif de pulverisation thermique
US20060237556A1 (en) * 2005-04-26 2006-10-26 Spraying Systems Co. System and method for monitoring performance of a spraying device
US20070210182A1 (en) * 2005-04-26 2007-09-13 Spraying Systems Co. System and Method for Monitoring Performance of a Spraying Device
US8371517B2 (en) * 2007-06-29 2013-02-12 Illinois Tool Works Inc. Powder gun deflector
CA2641508C (fr) * 2008-10-22 2016-07-12 Honda Motor Co., Ltd. Procede et systeme d'application d'un revetement par pulverisation
US8783585B2 (en) * 2009-05-20 2014-07-22 General Electric Company Methods and systems for mixing reactor feed
DE102011055660B4 (de) 2011-11-23 2013-09-05 P+S Pulverbeschichtungs- Und Staubfilteranlagen Gmbh Verfahren zum Ausbringen von Pulver mittels einer Pulversprühpistole und Pulversprühpistole zur Durchführung des Verfahrens
US10478847B2 (en) * 2015-05-22 2019-11-19 Dürr Systems Ag Coating system and associated operating method
WO2017069018A1 (fr) * 2015-10-23 2017-04-27 日本発條株式会社 Dispositif de pulvérisation de peinture pour barre stabilisatrice, et équipement ainsi que procédé de revêtement
US20180345300A1 (en) * 2017-05-31 2018-12-06 Nike, Inc. Air Masking Nozzle
KR102115577B1 (ko) * 2019-11-28 2020-05-27 주식회사 보국강업 고품질 분체도장 장치
CN114832960A (zh) * 2022-05-23 2022-08-02 佛山展弘智能科技有限公司 一种高速静电粉末喷涂旋杯的涡轮杯头

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EP0295366A2 (fr) * 1987-06-16 1988-12-21 Ransburg-Gema GmbH Installation de revêtement par pulvérisation
US6003779A (en) * 1997-10-23 1999-12-21 The Eastwood Company Powder coating application gun and method for using same

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WO1985001894A1 (fr) * 1983-10-27 1985-05-09 Icab Industrial Coating Ab Procede a utiliser avec une buse de pulverisation et dispositif pour realiser ce procede
EP0295366A2 (fr) * 1987-06-16 1988-12-21 Ransburg-Gema GmbH Installation de revêtement par pulvérisation
US6003779A (en) * 1997-10-23 1999-12-21 The Eastwood Company Powder coating application gun and method for using same

Also Published As

Publication number Publication date
KR20040095160A (ko) 2004-11-12
CN1572376A (zh) 2005-02-02
US7478763B2 (en) 2009-01-20
ES2271728T3 (es) 2007-04-16
JP2004330190A (ja) 2004-11-25
EP1475159B1 (fr) 2006-08-30
DE502004001303D1 (de) 2006-10-12
ATE337857T1 (de) 2006-09-15
DE10319916A1 (de) 2004-11-25
CA2466245C (fr) 2008-04-22
TW200507943A (en) 2005-03-01
AU2004201870A1 (en) 2004-11-25
NZ532761A (en) 2004-12-24
US20050001061A1 (en) 2005-01-06
PT1475159E (pt) 2007-01-31
AU2004201870B2 (en) 2005-10-13
TWI278353B (en) 2007-04-11
KR100636003B1 (ko) 2006-10-18
CA2466245A1 (fr) 2004-11-05

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