WO1988008755A1 - Filtre suivant pour installation de vaporisation de peinture en poudre - Google Patents

Filtre suivant pour installation de vaporisation de peinture en poudre Download PDF

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Publication number
WO1988008755A1
WO1988008755A1 PCT/DK1988/000075 DK8800075W WO8808755A1 WO 1988008755 A1 WO1988008755 A1 WO 1988008755A1 DK 8800075 W DK8800075 W DK 8800075W WO 8808755 A1 WO8808755 A1 WO 8808755A1
Authority
WO
WIPO (PCT)
Prior art keywords
air
powder
filter
water
guide means
Prior art date
Application number
PCT/DK1988/000075
Other languages
English (en)
Inventor
Thomas Lassen
Original Assignee
Ideal-Line A/S
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 Ideal-Line A/S filed Critical Ideal-Line A/S
Publication of WO1988008755A1 publication Critical patent/WO1988008755A1/fr

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
    • B05B14/00—Arrangements for collecting, re-using or eliminating excess spraying material
    • B05B14/40—Arrangements for collecting, re-using or eliminating excess spraying material for use in spray booths
    • B05B14/46—Arrangements for collecting, re-using or eliminating excess spraying material for use in spray booths by washing the air charged with excess material
    • B05B14/465—Arrangements for collecting, re-using or eliminating excess spraying material for use in spray booths by washing the air charged with excess material using substantially vertical liquid curtains or wetted walls behind the object to be sprayed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B14/00—Arrangements for collecting, re-using or eliminating excess spraying material
    • B05B14/40—Arrangements for collecting, re-using or eliminating excess spraying material for use in spray booths
    • B05B14/46—Arrangements for collecting, re-using or eliminating excess spraying material for use in spray booths by washing the air charged with excess material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B14/00—Arrangements for collecting, re-using or eliminating excess spraying material
    • B05B14/40—Arrangements for collecting, re-using or eliminating excess spraying material for use in spray booths
    • B05B14/48—Arrangements for collecting, re-using or eliminating excess spraying material for use in spray booths specially adapted for particulate material
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working

Definitions

  • the invention relates to an after-filter for a powder paint spraying installation comprising a closed filter housing to which the powder containing air is supplied via an inlet duct and from which the filtered air is discharged via an outlet duct, and comprising a water tank at the bottom of the housing and guide means for passing water from the water tank up to an area at the top of the housing and subsequently returning it to the tank under the influence of the airflow up through the filter housing.
  • Paint with dry powder offers by comparison with processes in which the paint is entrained in a solvent many quality and environmental advantages.
  • the powder used is almost dust-like and consequently it is necessary to suck-out from the sprayingbooth used an amount of air sufficiently large to maintain an air velocity of at least 0.5 m/sec in the booth front opening and other openings in order to prevent the powder from penetrating out from the booth and thus creating a nuisance to the operator and any other persons near the booth.
  • the after-filter according to the invention is characterized in that the guide means comprise a first, second and third guide means being so adapted that the powder is bound by the water during the passage of the air through each of the said means, the water subsequently being separated from the air during the passage of the latter through a fourth guide means, and that the first guide means is a substantially vertically positioned wall preferably occupying the width of the entire housing, and having at its top an overflow serving as water trap and terminat ⁇ ing at its lower end at a suitable distance above the water surface.
  • This entails very low operational costs as the previously used expensive filter material is replaced by water which at the same times binds the precipitated powder which can then be removed from the filter without raising dust. Additionally, due to the strong adhesion between the fine powder and water, and due to the binding taking place in three successive process steps, a novel powder separation degree is obtained.
  • the fourth guide means may be one or more ducts stretching substantially horizontally from the third to the first guide means, and having in its air outlet at least one deflector grate with a number of baffle plates being positioned in such inter- spaced relationship as to force the air at least once during its passage through the grate to abruptly change direction.
  • the filter deflector grate is an integral part of the fourth guide means.
  • the air passages through the filter housing may furthermore be so dimensioned that when the air velocity in the inlet duct is 10-30 m/sec, the flow is laminar between the front wall of the filter housing and the partitioning wall, and turbulent between the lower edge of the partitioning wall and the water surface, as well as in the guide ducts.
  • this causes the air to flow more calmly and slowly through the housing, thus allowing the powder to bind to the water running down the partitioning wall and to the overlying water surface. Due to the laminar flow the water in this section of the water tank remains substantially calm, thus allowing the powder to settle for subsequent removal according to need.
  • the turbulent flow starting at the lower edge of the partitioning wall however, entrains water from this section of the water tank up through the guide ducts in which, due to the turbulence, it effectively washes the last powder residue from the air.
  • a perforated distri ⁇ bution plate may furthermore be inserted in the air passage between the front wall of the filter housing and the partitioning wall, the said plate forming an angle with the partioning wall of 10-50°, preferably 20-40°, and the perforation degree of the distribution plate may be 20-40%, preferably 25-35%, while the diameter of the perforated apertures is 3-15 mm, preferably 5-10 mm.
  • fig. 1 is a diagrammatic, partly sectional side view of a powder paint spraying installation
  • fig. 2 is an enlarged section through an embodiment of an after-filter according to the invention.
  • Fig. 1 is a powder paint spraying installation using an after-filter according to the invention, the entire filter being designated 1.
  • a sprayingbooth designated 2
  • an object 3 to be painted is suspended from an conveyor 10. Painting takes place as a spray of electrostatically charged powder 7 is jetted from an electrostatic sprayer 5, with an applied voltage indicated by reference numeral 7.
  • the powder is fed to the sprayer 5 via a powder pipe 8 connected to a feed tank 9 being provided with a powder pump, not shown, for pumping the powder through the powder pipe 8.
  • the object 3 attracts the powder due to the voltage difference and is thus covered with a suitable powder layer, which is subsequently sintered by passing the object through a varnishing furnace, not shown.
  • suction is performed on this air by means of a suction ventilator, not shown, coupled to the entire installa- tion after the filter 1.
  • the air is first passed through a suction channel 11 to a cyclone 14 for separation of approx. 97% of the powder.
  • the separated powder flows down into the feed tank 9 via a screen 15 serving to remove or comminute possible lumps in the powder.
  • the powder may then be reused as described above.
  • the air is passed further on through an inlet duct 12 into the after-filter 1 to be filtered, and finally to be discharged e.g. into the open air through an outlet duct 13.
  • the after- filter shown in fig. 2 in which the conventional filter materials are replaced by water 17 forming a tank at the bottom of a filter housing 16.
  • the powder containing air is supplied at the top of the filter housing via the inlet duct 12 and leaves this housing as a clean powder through the outlet duct 13.
  • the air flows through the filter housing as indicated by arrows, whereby the powder is separated as decribed in more detail below.
  • a partitioning wall 18 occupying the entire width of the housing, and having at its top an overflow 19 serving as water trap.
  • the lower end of the partitioning wall 18 terminates at a suitable distance above the surface of the water 17.
  • each of these horizontal guide ducts is provided with a deflector grate 25.
  • the said grate consists of a number of baffle plates 26 being zigzag- shaped and positioned in interspaced relationship with a suitably large angle of inclination in relation to the airflow direction.
  • the distance between the front wall 22 of the filter housing and the partitioning wall 18 is so large that the air velocity in this area is lowered to about 0.5 m/sec. causing the airflow to be laminar.
  • the passage between the lower edge 20 of the partitioning wall 18 and the water 17, and in the guide ducts 23, 24, is so narrow as to cause the airflow in this section to become turbulent again.
  • the said distribution plate 27 is provided with a number of throughflow apertures 28 being evenly distributed across the perforated disc.
  • the degree of perforation is 20-40%, preferably 25-35%, and the diameter of the per- forated apertures is 3-15 mm, preferably 5-10 mm.
  • the mode of operation of the after-filter is as follows.
  • the air flowing into the filter housing 16 through the inlet duct 12 first hits the distribution plate 27 distributing the air across its entire area and directing it obliquely towards the partitioning wall 18 at a heavily reduced velocity within the laminar area.
  • the air velocity is acceletrated to the turbulent area, thus entraining water up into the guide ducts 23, 24, in which the flow is also turbulent, as indicated by the arrows.
  • the air flows further on through the deflector grate 24 and encounters the zig- zag-shaped baffle plates 26 being obliquely positioned relatively to the direction of flow.
  • the water is now separated from the air, which flows on - possibly via an additional deflector grate 29 - into the outlet duct 13 from which the now clean air is vented into the open air.
  • the separated water runs through a number of underpass conduits 30 down into the overflow 19.
  • the overflow is provided with an overflow edge 31 facing the partitioning wall 18 and overlying the lower edge 32 of the underpass conduits 30.
  • the water then flows down along the outer side of the partitioning wall 18 and constantly encounters the air slowly flowing along the wall, the powder content of this air hereby being moistened and bound by the water.
  • the powder is moistened and mixed in three successive steps, in each of these steps a certain percentage of the powder is bound to the water.
  • the amount of powder separated in each successive step is a percentage of the residual amount from the previous step this means that the total degree of separation is almost 100%.
  • the powder is moistened in the air, while the latter is slowly flowing across the water surfaces on the partitioning wall 18 and on such part of the surface of the tank 17 which is positioned to the left of the lower edge 20 of the partitioning wall.
  • the powder is moistened between this edge and the vertical guide duct 23, the now extremely turbulent airflow whirling up the water surface in this area.
  • the third step the now very small powder residue is washed out during the passage of the vertical guide ducts 23, an efficient mixing of the powder and the partially vaporized water entrained from the second step taking place at this locality due to the strong turbulens.

Landscapes

  • Separation Of Particles Using Liquids (AREA)

Abstract

Un filtre suivant (1) pour une installation de vaporisation de peinture en poudre comprend un logement de filtre fermé (16), dans lequel l'air contenant la peinture en poudre est introduit par un conduit d'entrée (12) et duquel l'air filtré sort par un conduit de sortie (13). Un réservoir d'eau (17) est placé au fond du logement de filtre (16), lequel comprend en outre un premier, un deuxième, un troisième et un quatrième organe de guidage (18, 17, 23, 24), respectivement, qui sont conçus de sorte que l'eau provenant du réservoir (17) sous l'influence de l'air s'écoulant à travers le logement de filtre (16) monte depuis la surface de l'eau jusqu'à une zone située au sommet du logement de filtre (16), puis redescend dans le réservoir (17). La peinture en poudre est successivement arrêtée par cette eau (17) durant le passage de l'air à travers le premier, le second et le troisième organe de guidage (18, 17, 23), puis l'eau est séparée de l'air durant le passage de ce dernier à travers le quatrième organe de guidage (24). En utilisant le filtre suivant décrit dans la présente invention, on obtient un niveau de filtrage de la peinture en poudre à partir de l'air dévié supérieur aux niveaux atteints par le passé et la peinture en poudre peut être retirée du filtre à l'état humide sans risque de nuisances dues à l'émission de poussière.
PCT/DK1988/000075 1987-05-04 1988-05-03 Filtre suivant pour installation de vaporisation de peinture en poudre WO1988008755A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DK226587A DK156939C (da) 1987-05-04 1987-05-04 Efterfilter til et pulversproejte-maleanlaeg
DK2265/87 1987-05-04

Publications (1)

Publication Number Publication Date
WO1988008755A1 true WO1988008755A1 (fr) 1988-11-17

Family

ID=8111193

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DK1988/000075 WO1988008755A1 (fr) 1987-05-04 1988-05-03 Filtre suivant pour installation de vaporisation de peinture en poudre

Country Status (2)

Country Link
DK (1) DK156939C (fr)
WO (1) WO1988008755A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008053178A1 (de) * 2008-10-24 2010-05-12 Dürr Systems GmbH Beschichtungseinrichtung und zugehöriges Beschichtungsverfahren
CN103406217A (zh) * 2013-07-18 2013-11-27 吴江市黎里建兴铸件厂 一种防结垢喷头
CN104858091A (zh) * 2015-05-13 2015-08-26 吴伟枝 一种气旋环保装置
CN111957485A (zh) * 2020-08-07 2020-11-20 浙江德易精密机械有限公司 一种三相电动机的外壳机壳快速涂装设备
US11097291B2 (en) 2016-01-14 2021-08-24 Dürr Systems Ag Perforated plate with increased hole spacing in one or both edge regions of a row of nozzles
US11529645B2 (en) 2016-01-14 2022-12-20 Dürr Systems Ag Perforated plate with a reduced diameter in one or both edge regions of a row of nozzles

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2125895A1 (de) * 1970-06-03 1971-12-16 Thermospray Ag Luftreinigungseinrichtung
SE370497B (fr) * 1970-05-14 1974-10-21 Technicair Sa
EP0004472A1 (fr) * 1978-03-29 1979-10-03 Morwood Holdings Pty. Ltd Cabine de pulvérisation
GB2081601A (en) * 1980-08-08 1982-02-24 Binks Bullows Ltd Spraybooth
DE2402651C2 (de) * 1973-01-22 1982-07-01 Carrier Drysys Ltd., London Vorrichtung zum Abscheiden von Farbpartikeln aus der Abluft von Farbspritzkabinen

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE370497B (fr) * 1970-05-14 1974-10-21 Technicair Sa
DE2125895A1 (de) * 1970-06-03 1971-12-16 Thermospray Ag Luftreinigungseinrichtung
DE2402651C2 (de) * 1973-01-22 1982-07-01 Carrier Drysys Ltd., London Vorrichtung zum Abscheiden von Farbpartikeln aus der Abluft von Farbspritzkabinen
EP0004472A1 (fr) * 1978-03-29 1979-10-03 Morwood Holdings Pty. Ltd Cabine de pulvérisation
GB2081601A (en) * 1980-08-08 1982-02-24 Binks Bullows Ltd Spraybooth

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACT OF JAPAN, Vol. 10, No. 185 (C-357); & JP,A,59 157 615, publ. 1986-02-20. *

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008053178A1 (de) * 2008-10-24 2010-05-12 Dürr Systems GmbH Beschichtungseinrichtung und zugehöriges Beschichtungsverfahren
US10150304B2 (en) 2008-10-24 2018-12-11 Duerr Systems, Gmbh Coating device and associated coating method
US10814643B2 (en) 2008-10-24 2020-10-27 Dürr Systems Ag Coating device and associated coating method
US11241889B2 (en) 2008-10-24 2022-02-08 Dürr Systems GmbH Coating device and associated coating method
CN103406217A (zh) * 2013-07-18 2013-11-27 吴江市黎里建兴铸件厂 一种防结垢喷头
CN103406217B (zh) * 2013-07-18 2016-08-17 吴江市黎里建兴铸件厂 一种防结垢喷头
CN104858091A (zh) * 2015-05-13 2015-08-26 吴伟枝 一种气旋环保装置
US11097291B2 (en) 2016-01-14 2021-08-24 Dürr Systems Ag Perforated plate with increased hole spacing in one or both edge regions of a row of nozzles
US11529645B2 (en) 2016-01-14 2022-12-20 Dürr Systems Ag Perforated plate with a reduced diameter in one or both edge regions of a row of nozzles
CN111957485A (zh) * 2020-08-07 2020-11-20 浙江德易精密机械有限公司 一种三相电动机的外壳机壳快速涂装设备
CN111957485B (zh) * 2020-08-07 2021-11-23 浙江德易精密机械有限公司 一种三相电动机的外壳机壳快速涂装设备

Also Published As

Publication number Publication date
DK226587A (da) 1988-11-05
DK156939B (da) 1989-10-23
DK226587D0 (da) 1987-05-04
DK156939C (da) 1990-03-19

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