EP0044842A1 - Powder spraying device provided with a rinsing device. - Google Patents
Powder spraying device provided with a rinsing device.Info
- Publication number
- EP0044842A1 EP0044842A1 EP81900271A EP81900271A EP0044842A1 EP 0044842 A1 EP0044842 A1 EP 0044842A1 EP 81900271 A EP81900271 A EP 81900271A EP 81900271 A EP81900271 A EP 81900271A EP 0044842 A1 EP0044842 A1 EP 0044842A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- nozzle
- powder
- gas
- flushing
- impact body
- 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
- 239000000843 powder Substances 0.000 title claims abstract description 41
- 238000005507 spraying Methods 0.000 title claims description 7
- 239000007921 spray Substances 0.000 claims abstract description 24
- 238000011010 flushing procedure Methods 0.000 claims abstract description 22
- 239000007789 gas Substances 0.000 claims description 47
- 238000010926 purge Methods 0.000 claims description 23
- 239000002245 particle Substances 0.000 claims description 14
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 2
- 238000004140 cleaning Methods 0.000 claims description 2
- 239000003546 flue gas Substances 0.000 claims description 2
- 238000011144 upstream manufacturing Methods 0.000 claims 1
- 229940098458 powder spray Drugs 0.000 abstract description 2
- 206010061218 Inflammation Diseases 0.000 abstract 1
- 230000001154 acute effect Effects 0.000 abstract 1
- 238000005054 agglomeration Methods 0.000 abstract 1
- 230000002776 aggregation Effects 0.000 abstract 1
- 230000004054 inflammatory process Effects 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 229920004449 Halon® Polymers 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- PXBRQCKWGAHEHS-UHFFFAOYSA-N dichlorodifluoromethane Chemical compound FC(F)(Cl)Cl PXBRQCKWGAHEHS-UHFFFAOYSA-N 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 235000001674 Agaricus brunnescens Nutrition 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 150000008282 halocarbons Chemical class 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
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
Definitions
- the invention relates to a powder atomizer with a spray nozzle for spraying powder supplied in a conveying gas stream, with a baffle arranged in the spray direction in front of the spray nozzle, the front side of which facing the nozzle directs the sprayed powder particles radially outwards, and with a flushing device which Purging gas for cleaning powder particles adhering to the impact body can escape under pressure from the rear side of the impact cone facing away from the spray nozzle.
- powder atomizers of this type a vacuum and a vortex are formed on the rear side of the impact body facing away from the spray nozzle. Admittedly, this has the consequence that parts of the externally flowing conveying air are drawn inwards again with individual powder particles. However, these powder particles are not completely passed on and form powder deposits on the rear side of the impact body. This is particularly troublesome because from time to time individual powder agglomerates detach from the impact body, strike the workpieces to be coated in a compact form and cause surface defects there.
- the invention is based on the Pu atomizer described at the outset and serves the task of improving the rinsing device in the simplest possible manner so that the rear side and edge of the impact body are reliably kept free of powder particles.
- a pronounced purging nozzle with an essentially radial exit plane of the purging gas is provided in the middle of the impact body along the rear side of the impact body.
- OM V IP could solve. This is also achieved without any special effort, since the impact body can be produced essentially in one piece from the conventional materials, in particular insulating plastic.
- the rear side of the impact body is formed concave, in particular conical, in the center of the flushing nozzle and delimited by a sharp ring edge.
- This does not necessarily have to be a conical surface with straight surface lines, but the cone can continue to be concave, that is to say the cone angle is larger in the middle than at the edge. This further facilitates the guidance of the flushing gas, which can then emerge more radially and may be deflected more towards the edge in the spray direction.
- the sharper the edge or the smaller the edge angle the greater the entrainment effect from the purge air. 'The greater the uniformity of the subsequent flow.
- the tip angle of the rear side of the impact body in the immediate area of the flushing nozzle is expediently between 110 ° and 170 °, in particular between 130 ° and 150 °.
- the flushing nozzle is designed as an annular gap nozzle with an essentially radial gas outlet.
- the flushing nozzle can have a central pin with a head which acts as a deflecting body and which is preferably tapered away from the nozzle.
- the flushing nozzle is designed as a rotating nozzle with a rotating gas outlet.
- it can have an inwardly directed annular cutting edge, which is preceded by an annular chamber and guide means for rotatingly guiding the purge gas into or into the annular chamber.
- the rotation effect can be by helical or spiral guide vanes or ribs or by just one only angled inlet hole can be achieved.
- the tangential and thus the radial speed component is then substantially greater than the axial one.
- the dedusting is favored c supply it through the "Coanda effect", which states that egg once a surface-scale air jet at this Fl che along strokes and can not solve it.
- the adhesive effect on the concave or hollowed-out rear surface sought here is greater than on a flat or even convex surface.
- the two nozzle shapes can also be combined in such a way that a rotating purge air stream is let out of an annular nozzle.
- the impact body is preferably seated on the front end of a feed pipe, which is in particular guided lengthways through a spray gun and the rear end of which can be connected to a purge gas source. It is currently considered to be advantageous to allow the purge gas to flow out continuously, with a delivery pressure of 0.2 to 1.3 bar being sufficient, but it is also a periodic impulse initiation of the purge. gases conceivable, provided that this does not affect the spraying process itself.
- a changeover switch for switching from a purge air source to an extinguishing gas source is then expediently provided in the purge gas duct.
- This changeover switch or such a changeover valve is expediently controlled automatically by a flue gas pushbutton in order to enable an immediate response.
- FIG. 1 shows a schematic illustration of a powder atomizer according to the invention
- FIG. 3 shows a modification of the impact body from FIG. 2.
- 1 denotes a powder spray gun, of which the design is essentially widely known and therefore need not be explained further.
- a conveying gas stream with finely divided spray powder is supplied to this pistol in a manner not shown further and is sprayed through a spray nozzle 2 to the right in the drawing.
- a tubular rod 3 is guided centrally to the spray nozzle through the whole powder gun, on the rear end of which there is a connecting sleeve 4 which also serves as a sliding handle. In this way, the distance a between the spray nozzle 2 and one Adjust the impact body 5, which sits on the front end of the tubular rod 3 by means of a counterbore and an annular seal 6.
- This impact body 5 has a rotationally symmetrical front surface 7 which merges from a slim conical hub 8 over a central toroidal surface into a blunt conical surface 9 which has a sharp edge 11 and an angle of less than 10 ° with the conical back 10 of the impact body forms.
- the back side 10 is here as a conical surface with a straight Man telline au f leads, can also expediently et what bombig with slightly cupped edges configured were ⁇ j edoch the.
- a central outlet channel 12 is provided in the impact body 5, in which a pin 13 is seated by means of radial webs, the mushroom head 14 of which is tapered in the direction of flow and an annular gap 15 with the inner edge of the conical rear side 10 forms, from which purge gas supplied under a pressure of 0.2 to 1.3 bar flows essentially radially in a fan-shaped manner along the rear face, in a radially fanned manner.
- the fetder gas emerging from the spray nozzle 2 is deflected outward with the powder particles carried by it through the front side 7 of the impact body 5 and joins again more downstream in the direction of the spray axis downstream of the impact body 5.
- the flow tends to break off at the edge 11 to form a vortex braid, and a vacuum is built up just behind the impact body, which results in irregular inflows and causes powder particles which are swirled inward to adhere to the rear and later to uncontrollably settle to solve. .
- the now introduced spray flow according to the arrows 16 prevents such a setting of a powder particle on this rear surface and especially on the edge 11. In the area of this relatively sharp edge
- Conveying gas flow entrains the inner, weaker purge gas flow and thus increases the purge effect.
- the rear connecting sleeve 4 is connected via a hose 0 17 to an electrically controllable changeover valve 18, which normally maintains a flow connection from a compressed air source 19 to the hose 17.
- the changeover valve 18 is however controlled by a smoke gas sensor 20 and switches immediately to a connection of an extinguishing gas source 21 to the hose 17 as soon as traces of smoke gas are found in the room. Extinguishing gas, as it is commercially available under the name Halon (fluorinated halogenated hydrocarbon), is then led along the purge gas path directly to the impact body, exactly where there may be an ignition.
- Halon fluorinated halogenated hydrocarbon
- the pin 13 could also be slidably mounted against spring force in order to enlarge the width of the annular gap 15 as a result of the higher supply pressure.
- a rotationally symmetrical swirl chamber 22 is provided on the inside, which is located in a circular nozzle opening 23 within an annular edge 24 with the Back 10 is connected and the purge air is supplied on a screw path through a tangential oblique bore 25 from the central bore 26.
- the purging gas When the purging gas is introduced into the swirl chamber, it is rotated centrically to the purging axis and enters along the ring edge 24 primarily with a tangential direction. In any case, the flow takes place in a widening vortex according to the arrows ⁇ 6 on the back 10, whereby an increased adhesive effect e is aimed.
- guide ribs provided in the center of the chamber can also be provided in screw or spiral form.
- FIG. 3 Such an embodiment is illustrated by FIG. 3.
- the impact body 52 which otherwise corresponds to the impact body 51 a.
- FIG. 2 has an elongated cylinder chamber 29 with respect to the swirl chamber 2, which is connected to the bore of the raw rod 3 with a central inflow channel 33.
- a i • sits substantially cylindrical guide body 27 which alternate each other on its outside helicoidal guiding ribs 28 and helical grooves 30 auf utilizat utilizat.und a Vor ⁇ chamber 31 from the downstream swirl chamber 22 a tre
- the S j oll air flowing from the tubular rod 3, essentially laminar, into the Vo chamber 31 is initially decelerated there and introduced evenly into the screw grooves 30. From there, it is introduced into the swirl chamber 22 a in a rotational flow about the body axis, where it is supplied to the nozzle opening 23 in substantially the same manner as in FIG. 2.
Landscapes
- Nozzles (AREA)
Abstract
Une tige cylindrique (3) mobile longitudinalement est disposee centralement par rapport a la buse de projection (2) d'un pistolet de projection de poudre (1). A son extremite libre se trouve un deflecteur conique (5) dont la surface laterale (9) forme une arete aigue (11) avec la face frontale (10) conique concave. Dans le canal d'echappement central (12) du deflecteur (5) est amenagee une buse de rincage presentant un orifice de sortie approximativement radial pour l'air de rincage fourni par une source d'air sous pression (19). La buse de rincage est constituee d'une tete (14) en forme de champignon formant un corps deflecteur place tout pres de l'extremite du canal d'echappement (12). Cette buse peut egalement etre realisee sous forme d'une buse de rotation a l'aide d'une arete annulaire tranchante et d'une chambre de tourbillonnement ou d'une nervure de guidage en forme d'helice. L'air de rincage s'ecoule continuellement le long de la face frontale (10) et empeche ainsi l'agglomeration de la poudre a cet endroit. Une soupape de commutation (18) commandee par une touche (20) peut aiguiller automatiquement le canal d'echappement sur une source de gaz (21) d'extinction qui chasse du gaz dans la region de projection ou existe le plus grand danger d'inflammation.A cylindrical rod (3) movable longitudinally is disposed centrally with respect to the spray nozzle (2) of a powder spray gun (1). At its free end is a conical deflector (5) whose lateral surface (9) forms an acute edge (11) with the front face (10) concave conical. In the central exhaust channel (12) of the deflector (5) is provided a flushing nozzle having an approximately radial outlet orifice for the flushing air supplied by a source of pressurized air (19). The rinsing nozzle consists of a mushroom-shaped head (14) forming a deflector body placed very close to the end of the exhaust channel (12). This nozzle can also be produced in the form of a rotation nozzle using a sharp annular edge and a swirl chamber or a helical guide rib. The rinsing air flows continuously along the front face (10) and thus prevents agglomeration of the powder at this location. A switch valve (18) controlled by a button (20) can automatically direct the exhaust channel to a source of extinguishing gas (21) which expels gas into the projection region where there is the greatest danger of inflammation.
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT81900271T ATE12736T1 (en) | 1980-02-01 | 1981-01-17 | POWDER ATTOMER WITH FLUSHING DEVICE. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19803003684 DE3003684A1 (en) | 1980-02-01 | 1980-02-01 | POWDER SPRAYER WITH RINSING DEVICE |
DE3003684 | 1980-02-01 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0044842A1 true EP0044842A1 (en) | 1982-02-03 |
EP0044842B1 EP0044842B1 (en) | 1985-04-17 |
Family
ID=6093506
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP81900271A Expired EP0044842B1 (en) | 1980-02-01 | 1981-01-17 | Powder spraying device provided with a rinsing device |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0044842B1 (en) |
DE (2) | DE3003684A1 (en) |
ES (1) | ES498885A0 (en) |
WO (1) | WO1981002116A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20030080206A1 (en) | 2001-03-08 | 2003-05-01 | Thomas Duerr | Powder bell purge tube |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE649073A (en) * | 1963-07-17 | 1964-10-01 | ||
NL7113656A (en) * | 1971-10-05 | 1973-04-09 | ||
DE2243273A1 (en) * | 1972-09-02 | 1974-03-14 | Sanitaria Gmbh | NOZZLE FOR SPRAY GUNS |
JPS5145143A (en) * | 1974-10-16 | 1976-04-17 | Ransburg Japan Ltd | Funshapataanno choseiga kanona funtaitosoyofunshanozuru |
DE2509851C2 (en) * | 1975-03-06 | 1984-03-15 | Ransburg-Gema AG, 9015 St.Gallen | Powder atomizer with impact body for coating objects in an electrostatic field |
JPS5829150B2 (en) * | 1977-12-03 | 1983-06-21 | ナカヤ産業株式会社 | spray device |
DE2819666A1 (en) * | 1978-05-05 | 1979-11-08 | Irs Gmbh | Paint spray gun for fluids or powders - incorporates fire extinguishing unit with extinguisher valve adjacent paint spray nozzle |
JPS54148042A (en) * | 1978-05-11 | 1979-11-19 | Onoda Cement Co Ltd | Electrostatic powder coating head |
JPS5534159A (en) * | 1978-09-01 | 1980-03-10 | Onoda Cement Co Ltd | Powder charging device and electrostatic powder depositing device |
-
1980
- 1980-02-01 DE DE19803003684 patent/DE3003684A1/en not_active Withdrawn
-
1981
- 1981-01-17 EP EP81900271A patent/EP0044842B1/en not_active Expired
- 1981-01-17 WO PCT/EP1981/000003 patent/WO1981002116A1/en active IP Right Grant
- 1981-01-17 DE DE8181900271T patent/DE3169931D1/en not_active Expired
- 1981-01-28 ES ES498885A patent/ES498885A0/en active Granted
Non-Patent Citations (1)
Title |
---|
See references of WO8102116A1 * |
Also Published As
Publication number | Publication date |
---|---|
ES8203645A1 (en) | 1982-04-16 |
ES498885A0 (en) | 1982-04-16 |
DE3003684A1 (en) | 1981-08-06 |
DE3169931D1 (en) | 1985-05-23 |
WO1981002116A1 (en) | 1981-08-06 |
EP0044842B1 (en) | 1985-04-17 |
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Legal Events
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