EP0294606B1 - Appareil pour vaporiser une peinture liquide - Google Patents

Appareil pour vaporiser une peinture liquide Download PDF

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Publication number
EP0294606B1
EP0294606B1 EP88107537A EP88107537A EP0294606B1 EP 0294606 B1 EP0294606 B1 EP 0294606B1 EP 88107537 A EP88107537 A EP 88107537A EP 88107537 A EP88107537 A EP 88107537A EP 0294606 B1 EP0294606 B1 EP 0294606B1
Authority
EP
European Patent Office
Prior art keywords
axial
axially
cone
bell
interruption
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.)
Expired - Lifetime
Application number
EP88107537A
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German (de)
English (en)
Other versions
EP0294606A1 (fr
Inventor
Rolf Schneider
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.)
Mahle Behr Industry GmbH and Co KG
Original Assignee
Behr Industrieanlagen GmbH and Co KG
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 Behr Industrieanlagen GmbH and Co KG filed Critical Behr Industrieanlagen GmbH and Co KG
Publication of EP0294606A1 publication Critical patent/EP0294606A1/fr
Application granted granted Critical
Publication of EP0294606B1 publication Critical patent/EP0294606B1/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
    • B05B3/00—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements
    • B05B3/02—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements
    • B05B3/10—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements discharging over substantially the whole periphery of the rotating member, i.e. the spraying being effected by centrifugal forces
    • B05B3/1064—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements discharging over substantially the whole periphery of the rotating member, i.e. the spraying being effected by centrifugal forces the liquid or other fluent material to be sprayed being axially supplied to the rotating member through a hollow rotating shaft
    • 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

Definitions

  • the invention relates to a device for atomizing liquid paint, with an atomizer bell rotatable about a central axis, which has an axial breakthrough at its bottom and a profiled, annular, coaxial overflow surface pointing axially forward and radially inward, the radially inner edge of which the axially front edge of the opening is connected by means of a profiled, annular, coaxial transition surface which delimits the base axially in front; and with a coaxial, centrally perforated deflection part, the center of its axial rear surface axially opposite the front opening end of the bell and the radially outer edge of which together with the bell forms an annular gap which forms the transition from an axial front surface of the deflection part to the overflow surface of the bell interrupts, the transition surface of the bell on the one hand and the axial rear surface and the radial edge surface of the deflection part on the other hand delimiting a gap-like space between the bell and the deflection part, which is only interrupted locally by
  • the base part of the transition surface of the bell and the axially opposite rear surface of the deflection part are flat and the gap part of the transition surface of the bell and the radially opposite edge surface of the deflecting part, so that the gap-like space between the bell and the deflecting part, apart from its local interruptions by the spacers, has the shape of an air space trapezoidal in the central axial section, which alternates in color and liquid washing-up liquid to remove residual paint in the event of a color change or the final cleaning of the device at the beginning of a break in operation.
  • the invention is therefore based on the object to provide a device of the type mentioned with better color flow in the gap-like space between the bell and the deflecting part of the device and improved flushability of the same in this room.
  • the axial rear surface of the deflecting part and the opposite base part of the transition surface each have an obtuse angle in profile, which are arranged while maintaining the gap-like space such that the color in a central portion of this space simultaneously axially flows in front and radially outwards; and that the axially rearwardly projecting center of the axial rear surface of the deflection part is delimited radially on the outside by a sharp deflection edge of the step of this rear surface, while the other profile kinks of the two complementary steps are rounded.
  • the radial ink flow on the center of the axial rear surface of the deflecting part at its sharp deflecting edge is converted into partial flows along cone shells with different opening angles and that these partial flows meet these in the middle section of the gap-like space between the deflecting part and bell, where previously color deposits were most common.
  • the invention thus brings about a targeted, locally different self-cleaning effect of a device of the type mentioned.
  • the device according to the invention which, like the device according to DE-GS 8 224 329 (FIG. 1), is provided with a nozzle which generates a narrow cone jet and has a flat end face, the axially front end of which coaxially engages in the opening on the base of the bell , which is designed as an axially forward convex bore, is now advantageously provided that the center of the axial rear surface of the deflecting part is provided with a circular, preferably sharp-edged recess, the axial length of which is substantially less than its diameter; and that the end face of the nozzle with the central axis forms an angle deviating from the right angle of preferably 15 ° .
  • the shallow depression and the oblique end face together cause the axially parallel part of the color jet of the nozzle to be thrown back to the oblique nozzle end face to a not too great extent and to be reflected there again, a partial stream of the paint radially outside the depression reaches the center of the axial rear surface of the deflecting part and another partial flow of paint on the trumpet-shaped axially front end section of the bore of the base of the bell, which reunite in the region of the sharp deflecting edge of the center edge. This also noticeably improves the color scheme in the device and its flushability.
  • the atomizer bell as in the case of the known devices, has a bottom with the axial opening with the base part of the transition surface, a subsequent ring with the gap part of the transition surface and an annular lip with the axially foremost and radially outermost part of the overflow surface
  • a slightly converging, conical jacket is formed on the lip axially backwards and ends axially behind the floor.
  • This roughly circular-cylindrical jacket in particular covers the bell ring, which was previously conical and therefore, as a radially outer bell part, has led to strong divergence of axially incoming steering air, and is able to produce the desired steering air flow, regardless of how the bell ring is designed.
  • the bell casing thus enables the bell to be profiled appropriately, for example in such a way that its overflow area between the lip and the deflecting part has a relatively large radial extension without the mass of the bell ring necessarily increasing, because there can be a radial between the casing on the one hand and the bell bottom and part of the bell ring, on the other hand, lying cavity are formed, which is closed axially at the rear by means of an annular disk, so that steering air cannot penetrate into the cavity.
  • a mainly rotationally symmetrical rotatable atomizer bell (10) with an axially inserted from the front, mainly rotationally symmetrical deflection part (28) of the device according to the invention consists of a circular disc-shaped base (12) with a central, axially convex bore (14) as a breakthrough, the axis of which Bell axis (16) determined; from a conical ring (18) which is formed axially obliquely forward on the edge of the base (12) and which is axially forward, i. H. to the left in the figure, diverging; and from an annular lip (20) molded onto the ring (18) and projecting axially forward.
  • the atomizer bell (10) On its axially front end face, the atomizer bell (10) has an annular, coaxial overflow surface (24) with an approximately circular, concave, radially inwardly elongated profile, the radially inner edge of which is connected to the axially front end of the bore (14) an annular, coaxial transition surface (26) is connected, the axially rear base part (26.1) of which lies partly in radial planes, the radial plane base (26.1.1) of the bell (10) embedded in the base (12), followed by a conical and axial Floor surface (26.1.2) diverging towards the front and a radially flat shoulder (26.1.3) bordering the front edge of the floor, so that bottom (26.1.1), diverging floor surface (26.1.2) and shoulder (26.1.3) in Profile form an obtuse-angled step with two rounded edges, with which corresponds an almost identical profiled axial rear surface (29), the axially opposite the bottom (26.1.1) and the bore (14) overlying
  • the atomizer bell (10) is provided with the deflecting part (28), which is approximately double trapezoidal in the central longitudinal section, the only slightly conical, i.e. almost radial plane, concave axial front surface (30) with the radially inner, axially forward, also almost radial plane part ( 24.1) of the overflow surface (24) of the bell (10) lies flush at a short distance and its axial rear surface (29) and radially outer, conical, axially forward as the ring part (18.1) diverging edge surface (31) with the stepped and at the Edge surface (31) angled transition surface (26) of the bell forms a gap-like intermediate space (32), the width of which is preferably constant, preferably 0.5 to 0.7 mm, and which is radial between the overflow surface (24) and the transition surface (26) Annular gap (34) forms.
  • the space (32) appears in the figure, corresponding to the complementary profile steps of the rear part (26.1) of the transition surface (26) or the rear surface (29), as a cranked channel with a radially inwardly widening initial section at the bell hole (14) and angled End section at the gap (34).
  • the deflecting part (28) is held at at least three points evenly distributed around the axis (16) by means of a spacer (36), each of which is designed as an outer collar of a cylindrical sleeve (37) arranged parallel to the axis and between the radially plane rear surface (29) of the deflecting part 828) and the shoulder (26.1.3) of the rear part (26.1) of the transition surface (26) are clamped, with each sleeve (37) having a screw (56) whose shaft is screwed into the bell (10) and which is also screwed (each axially from the rear) into the deflection part (28).
  • the radially outer, radially inward-facing part (24.2) of the overflow surface (24) of the bell (10) ensures that the partial ink flows combined at the gap (34) on the front transition surface part (26.2) or on the front surface (30) are more radially Propagation can be deflected in the axis-parallel direction.
  • the deflecting part (28) On its base facing the bell (12) On the rear side, the deflecting part (28) is provided with an insert (38) in a recess (40) which extends through it to the front of the deflecting part and, by means of the insert, slows down and redirects the part of the paint flow directed axially forward through the bell hole (14 ) on the front surface (30) of the deflecting part (28).
  • the insert (38) has, inter alia, an axial blind bore (42) axially following the bore (14), which opens out in the center of the bottom of a sharp-edged circular-cylindrical depression (43) of small axial depth, the diameter of which is smaller than the predominant diameter of the bell bore (14).
  • the atomizer bell (10) is provided on its axial rear side with a circular cylindrical socket (48) formed on its base (12), in the threaded insert (49) of which the axially front end of a hollow shaft (not shown) for rotating the bell (10) about its axis (16) can be screwed in.
  • an ink supply tube (45) which is stationary when the atomizer bell (10) rotates, at the axially front end of which a paint nozzle (51) is arranged centrally, axially following the bore (14) at its transition into the trumpet-shaped end section lets out in front of the insert (38) seated in the center of the deflecting part (28) in a narrow cone jet, part of the color reaching the annular base of the insert recess (43) and being thrown back there to the nozzle (51), the inclined plane of which Front surface (51.1) reflects this color part tangentially to the rounding of the front section of the bore (14), while another part of the color strikes the surroundings of the recess (43) at an angle and reaches the edge (28.1) on the rear surface (29), where that color part is divided in that it partly changes to the opposite transition surface (26), where it wi combines with the color part mentioned first rd that is already flowing on this transition surface.
  • the main stream of paint is thus deflected into the gap-like intermediate space (32), from which the paint passes through the annular gap (34) onto the overflow surface (24) to the lip (20), where the paint droplets are mechanically thrown off at a spray edge (60) by means of a loading edge (62) electrostatically charged and transported in the electrostatic field to an object to be colored, for example an automobile body.
  • a step-shaped radial widening (15) of the bore (14) of the bell bottom (12) results in a bore (47) of the nozzle (48) provided at the rear with an internal thread for screwing in the threaded insert (49).
  • a slightly conical, slightly forward diverging jacket (80) which is molded onto the lip (20) and an annular cavity (82) bounded radially on the outside, which is bounded radially on the inside by the bell ring (18), the bell bottom (10) and the connecting piece (48) and is closed at the rear by means of the disk (78).
  • the jacket In the figure, from the right axially flowing steering air is brought to little divergence by the jacket.

Landscapes

  • Nozzles (AREA)
  • Electrostatic Spraying Apparatus (AREA)

Claims (3)

1. Dispositif pour vaporiser une peinture liquide, comprenant une cloche de vaporisation (10) tournant autour d'un axe central (16) et présentant sur son fond (26.1) un percement axial (alésage 14) et une surface de débordement (24) coaxiale, annulaire, profilée, dirigée axialement vers l'avant et radialement vers l'intérieur dont le bord radialement intérieur est relié au bord axialement antérieur du percement au moyen d'une surface de transition (26) coaxiale, annulaire, profilée délimitant le fond axialement vers l'avant; et un élément déflecteur (28) coaxial percé au centre dont le centre de sa surface axiale arrière (29) se situe axialement en face de l'extrémité avant du percement de la cloche et dont le bord radialement extérieur forme, conjointement avec la cloche, une fente annulaire (34) qui interrompt la transition entre une surface axiale avant (30) de l'élément déflecteur et la surface de débordement de la cloche, la surface de transition de la cloche d'une part et la surface axiale arrière ainsi que la surface latérale (31) radiale de l'élément déflecteur, d'autre part, délimitant un espace (32) en forme de fente entre la cloche et l'élément déflecteur lequel espace n'est interrompu que localement par des écarteurs (36), caractérisé en ce que la surface axiale arrière (29) de l'élément déflecteur (28) et la partie de fond (26.1) de la surface de transition (26) qui lui fait face présentent chacune, en profil, un gradin à angle obtus, lesquels gradins sont disposés, avec conservation de l'intervalle (32) en forme de fente, de telle façon que, à l'intérieur d'une section médiane (26.1.2) de cet intervalle, la peinture s'écoule en même temps axialement vers l'avant et radialement vers l'extérieur; et que le centre de la surface axiale arrière (29) de l'élément déflecteur (28) dépassant axialement vers l'arrière est délimité radialement à l'extérieur par une vive arête de déviation (28.1) du gradin de cette surface arrière (29), tandis que les autres coudes du profil des deux gradins complémentaires sont arrondis.
2. Dispositif selon la revendication 1, comprenant une buse (51) produisant un jet conique serré et présentant une face frontale (51.1) plane, dont l'extrémité axialement antérieure s'emboîte coaxialement dans l'ouverture située au fond (26.1) de la cloche et réalisée sous la forme d'un alésage (14) qui s'élargit axialement vers l'avant de manière convexe, en profil, le centre de la surface axiale arrière (29) de l'élément déflecteur (28) étant muni d'une dépression circulaire (43), de préférence à arête vive, dont la longueur axiale est sensiblement plus petite que son diamètre, et la face frontale (51.1) de la buse (51) formant avec l'axe central (16) un angle différent de l'angle droit, de préférence de 15°.
3. Dispositif selon l'une des revendications 1 ou 2, dont la cloche de vaporisation (10) comporte un fond (12) muni de l'ouverture axiale (14), avec la section de fond (26.1) de la surface de transition (26), suivie d'un anneau (18) avec la section de fente (26.2) de la surface de transition (26) et une lèvre annulaire (20) avec la partie (24.2) de la surface de débordement (24) située le plus en avant dans le sens axial et le plus à l'extérieur dans le sens radial, une enveloppe conique (80) qui se termine axialement derrière le fond (12) étant conformée à ladite lèvre (20), à savoir axialement vers l'arrière et de manière légèrement convergente vers l'arrière.
EP88107537A 1987-06-12 1988-05-11 Appareil pour vaporiser une peinture liquide Expired - Lifetime EP0294606B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE8708312U DE8708312U1 (de) 1987-06-12 1987-06-12 Einrichtung zum Vernebeln flüssiger Farbe
DE8708312U 1987-06-12

Publications (2)

Publication Number Publication Date
EP0294606A1 EP0294606A1 (fr) 1988-12-14
EP0294606B1 true EP0294606B1 (fr) 1990-07-18

Family

ID=6809073

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88107537A Expired - Lifetime EP0294606B1 (fr) 1987-06-12 1988-05-11 Appareil pour vaporiser une peinture liquide

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US (1) US4838487A (fr)
EP (1) EP0294606B1 (fr)
DE (2) DE8708312U1 (fr)

Families Citing this family (25)

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Publication number Priority date Publication date Assignee Title
US4919333A (en) * 1986-06-26 1990-04-24 The Devilbiss Company Rotary paint atomizing device
US4927081A (en) * 1988-09-23 1990-05-22 Graco Inc. Rotary atomizer
US5063350A (en) * 1990-02-09 1991-11-05 Graco Inc. Electrostatic spray gun voltage and current monitor
US5093625A (en) * 1990-02-09 1992-03-03 Graco Inc. Electrostatic spray gun voltage and current monitor with remote readout
US5100057A (en) * 1990-03-30 1992-03-31 Nordson Corporation Rotary atomizer with onboard color changer and fluid pressure regulator
FR2661115B1 (fr) * 1990-04-24 1992-07-31 Sames Sa Dispositif de pulverisation centrifuge d'un produit de revetement, notamment pour application par projection electrostatique.
US5474236A (en) * 1992-12-03 1995-12-12 Nordson Corporation Transfer of electrostatic charge to a rotary atomizer head through the housing of a rotary atomizing spray device
DE9419641U1 (de) * 1994-12-07 1995-02-02 Dürr GmbH, 70435 Stuttgart Rotationszerstäuber mit einem Glockenkörper
US6056215A (en) * 1995-03-15 2000-05-02 Nordson Corporation Electrostatic rotary atomizing spray device
US5697559A (en) * 1995-03-15 1997-12-16 Nordson Corporation Electrostatic rotary atomizing spray device
US6003784A (en) * 1996-04-26 1999-12-21 Gunnar van der Steur Rotary atomizer with internal chamber
US5947377A (en) * 1997-07-11 1999-09-07 Nordson Corporation Electrostatic rotary atomizing spray device with improved atomizer cup
US8141797B2 (en) * 2001-01-25 2012-03-27 Durr Systems Inc. Rotary atomizer for particulate paints
US6189804B1 (en) 1998-03-27 2001-02-20 Behr Systems, Inc. Rotary atomizer for particulate paints
FR2791279B1 (fr) * 1999-03-25 2002-03-29 Sames Sa Dispositif de projection d'un produit de revetement en poudre et organe de projection equipant un tel dispositif
US6341734B1 (en) 2000-10-19 2002-01-29 Efc Systems, Inc. Rotary atomizer and bell cup and methods thereof
FR2836638B1 (fr) * 2002-03-01 2004-12-10 Sames Technologies Dispositif de pulverisation de produit de revetement liquide
US6889921B2 (en) * 2002-09-30 2005-05-10 Illinois Tool Works Inc. Bell cup skirt
DE10345342A1 (de) * 2003-09-19 2005-04-28 Engelhard Arzneimittel Gmbh Verfahren zur Herstellung eines lagerstabilen Extraktes aus Efeublättern, sowie ein nach diesem Verfahren hergestellter Extrakt
FR2915115B1 (fr) * 2007-04-23 2010-09-10 Sames Technologies Organe de pulverisation,dispositif de projection comportant un tel organe,installation de projection et methode de nettoyage d'un tel organe
US8602326B2 (en) * 2007-07-03 2013-12-10 David M. Seitz Spray device having a parabolic flow surface
DE102009038290A1 (de) * 2009-08-21 2011-02-24 Abb Ag Zerstäuberglocke
JP6113569B2 (ja) * 2013-04-25 2017-04-12 本田技研工業株式会社 回転霧化式塗装装置
DE102017116715A1 (de) * 2017-07-24 2019-01-24 Eisenmann Se Düsenkopf für einen Rotationszerstäuber zum Aufbringen eines Beschichtungsmaterials auf einen Gegenstand
US20220219186A1 (en) * 2021-01-14 2022-07-14 Fanuc America Corporation Wear resistant distributor post

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DE884325C (de) * 1948-07-10 1953-07-27 Hauser & Cie Ag Neumuehle Toes Vorrichtung zum Zerstaeuben von Fluessigkeiten
FR2336183A1 (fr) * 1975-12-26 1977-07-22 Marchand Bernard Couronne de compensation d'air et de repulsion pour appareil d'application de peinture liquide par procede electrostatique du type a disque tournant a grande vitesse
DE3508970C1 (de) * 1985-03-13 1986-07-31 Walter Giersiepen GmbH & Co, 5608 Radevormwald Farbzerstäuber
DE3509874C2 (de) * 1985-03-19 1994-05-19 Behr & Sohn Hermann Einrichtung zum Vernebeln flüssiger Farbe
US4643357A (en) * 1985-11-22 1987-02-17 Binks Manufacturing Company Rapidly cleanable atomizer
DE3616684A1 (de) * 1986-05-16 1987-11-19 Behr Industrieanlagen Zerstaeuber zum elektrostatischen beschichten von gegenstaenden
US4776520A (en) * 1987-05-11 1988-10-11 Binks Manufacturing Company Rotary atomizer

Also Published As

Publication number Publication date
US4838487A (en) 1989-06-13
DE8708312U1 (de) 1987-07-30
DE3860334D1 (de) 1990-08-23
EP0294606A1 (fr) 1988-12-14

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