[0001] The present invention relates to a rotary atomizing electrostatic coating apparatus
of the type capable of controlling a shaping air flow pattern.
[0002] Japanese Patent Application No. HEI 7-24367 discloses a rotary atomizing electrostatic
coating apparatus of the type capable of controlling a shaping air flow pattern. In
the apparatus, as illustrated in FIGS. 8 and 9, shaping air nozzles 6' are arranged
on a first circle having its circle center on an axis of rotation of a rotary atomizing
head, and pattern control air nozzles 7' are arranged on a second circle having a
larger diameter than the first circle. Each shaping air nozzle 6' has a nozzle axis
inclined from a line parallel to an axis of the rotary atomizing head so that the
shaping air flow pattern is spread in a direction away from the shaping air nozzles.
The air expelled from the pattern control air nozzles 7' collides with the shaping
air flow pattern and changes the pattern.
[0003] Since the shaping air is expelled from the nozzles at a high speed, the shaping air
flow draws air around the flow to generate a secondary flow (accompanying air flow).
It is important that the secondary flow freely accompany the shaping air flow without
generating turbulence or a vortex so that a smooth shaping air flow is formed.
[0004] However, in the conventional apparatus, since the pattern control air nozzles are
disposed radially outside the arrangement of the shaping air nozzles, free generation
of the accompanying air flow is obstructed, producing a negative pressure adjacent
the shaping air nozzles, causing vortices or turbulence V (FIG. 8) to be generated.
As a result, atomized paint around the vortices is drawn to the region and in turn
attaches to the atomizing head and the shaping air cap. Further, when the pattern
control air is being expelled, the amount of the main air flow increases so that the
negative pressure and the air turbulence are enhanced to draw more paint particles.
The paint particles which adhere to the atomizing head and the air cap drop onto the
body to be coated to degrade the coating quality.
[0005] Furthermore, US 5,397,063 shows an atomizer head for spray coating of electrostatic
coating according to the preamble of claim 1. This atomizer head has shaping air nozzles
disposed around the rotating cup in a circle. Further, a second circle of air nozzles
is disposed offset from the plane of the shaping air nozzles towards the back of the
atomizer.
[0006] Finally, WO 88/10152 also describes an atomizer head for spray coating of electrostatic
coating. The coating is atomized in a rotary bell cup, and is propelled and shaped
by a shaping air stream released from a ring of nozzles arranged aground the atomizing
bell cup. An additional air stream is generated in a ring shaped channel and nozzle
arrangement which is located in concentric fashion with respect to the atomizing head
and in distance therefrom.
[0007] The object of the present invention is to provide a rotary atomizing electrostatic
coating apparatus that can form a shaping air flow generating almost no vortices or
turbulence therearound.
[0008] The above-described object can be achieved by providing a rotary atomizing electrostatic
coating apparatus according to claim 1 where shaping air nozzles are arranged on a
first circle having its center on an axis of rotation of an atomizing head and pattern
control air nozzles are arranged on a second circle having a larger diameter than
the first circle of the shaping air nozzles. The pattern control air nozzles may be
located in the range of 3 mm to 100 mm on a rear side of the shaping air nozzles in
an axial direction of the atomizing head and inside a circle having a diameter three
times a diameter of the atomizing head in a radial direction of the atomizing head.
[0009] Further, an opening for permitting air to pass therethrough is provided to the rotary
atomizing electrostatic coating apparatus radially between the first circle and the
second circle.
[0010] In the above-described apparatus, since a configuration of an air cap is optimized
due to the locational relationship between the shaping air nozzles and the pattern
control air nozzles, a flow accompanying the shaping air flow is generated smoothly
around the shaping air flow so that generation of vortices is effectively suppressed
and adhesion of atomized paint drops onto the air cap is effectively prevented.
[0011] Further due to the opening air is smoothly introduced to a space between the shaping
air nozzles and the pattern control air nozzles from the rear side through the opening,
so that despite the provision of the pattern control air nozzles, a flow accompanying
the shaping air flow is generated smoothly around the shaping air flow. As a result,
generation of vortices is effectively suppressed and adhesion of atomized paint drops
onto the air cap is effectively prevented.
[0012] The above and other objects, features, and advantages of the present invention will
become more apparent and will be more readily appreciated from the following detailed
description of the preferred embodiment of the present invention in conjunction with
the accompanying drawings, in which:
FIG. 1 is a schematic cross-sectional view of a rotary atomizing electrostatic coating
apparatus according to a first unclaimed example
FIG. 1A is a partial view of FIG. 1;
FIG. 2 is a graph illustrating a relationship, obtained in tests, between a magnitude
of paint adhesion to a cap and head and an axial distance between inner nozzles (shaping
air nozzles) and outer nozzles (pattern control air nozzles);
FIG. 3 is a graph illustrating a relationship, obtained in tests, between a magnitude
of paint adhesion to a cap and head and a diameter of a circle on which the outer
nozzles are arranged;
FIG. 4 is a schematic cross-sectional view of a rotary atomizing electrostatic coating
apparatus according to an embodiment of the present invention;
FIG. 5 is a front elevational view of the apparatus of FIG. 4;
FIG. 6 is a schematic cross-sectional view of a rotary atomizing electrostatic coating
apparatus according to a second unclaimed example
FIG. 7 is a front elevational view of the apparatus of FIG. 6;
FIG. 8 is a schematic cross-sectional view of a conventional rotary atomizing electrostatic
coating apparatus; and
FIG. 9 is a front elevational view of the apparatus of FIG. 8.
[0013] FIGS. 1-3 illustrate an apparatus and test results according to an unclaimed example
FIGS. 4 and 5 illustrate an apparatus according to an embodiment of the present invention;
and FIGS. 6 and 7 illustrate an apparatus according to a second unclaimed example
Portions common or similar to all of the unclaimed examples and of the embodiment
of the present invention are denoted with the same reference numerals throughout the
whole description. and will be explained with reference to, for example, FIG. 1.
[0014] As illustrated in FIG.1, a rotary atomizing electrostatic coating apparatus includes
an atomizing head 1 for atomizing paint which has an axis of rotation and is rotatable
about the axis of rotation, an air motor 2 for driving or rotating the atomizing head
1, a cover (housing) 3 for housing the air motor therein and made from synthetic resin,
a paint feed tube 4 for supplying paint to the atomizing head 1, and an air cap 5,
disposed on a front side of the housing 3. The apparatus further includes a plurality
of shaping air nozzles 6 formed in the air cap 5, for expelling shaping air and accelerating
paint particles dispersed from the atomizing head 1 toward a workpiece to be coated,
and a plurality of pattern control air nozzles 7, disposed radially outside the shaping
air nozzles, for expelling pattern control air to thereby control the flow pattern
of the shaping air within a variable range of the shaping air flow pattern.
[0015] The shaping air nozzles 6 are arranged on a first circle having its circle center
on the axis of rotation of the atomizing head 1. The pattern control air nozzles 7
are arranged on a second circle located outside the first circle and having the same
circle center as the first circle.
[0016] Each shaping air nozzle 6 has an axis inclined (or twisted) by a predetermined angle
(more particularly, 30-40 degrees) from a line parallel to the axis of rotation of
the atomizing head 1 and passing through a center of the nozzle 6 in a direction perpendicular
to a radial direction of the atomizing head so that a shaping air flow pattern is
spread in a direction away from the shaping air nozzle.
[0017] Each of pattern control air nozzles 7 is disposed so as to intersect the shaping
air flow pattern when extended in a frontward direction of each pattern control air
nozzle 7 whereby a configuration of the shaping air flow pattern is controllable.
[0018] Control of the shaping air and the control air is conducted as follows:
[0019] Paint particles atomized and dispersed radially outwardly from the atomizing head
1 are accelerated by the shaping air toward a workpiece to be coated located in front
of the coating apparatus. Since the direction of the shaping air expelled from the
shaping air nozzle is inclined from the line parallel to the axis of rotation of the
atomizing head 1, the shaping air flow pattern is spread. In the case where an area
of the object to be coated is wide such as a general surface of an automobile body,
the coating is conducted using the shaping air only without using the pattern control
air. In the case where an area of the object to be coated is narrow and small, the
coating is conducted using both the shaping air and the pattern control air. In this
way, overspraying of paint will be prevented so that consumption of paint is minimized.
The size of the paint flow pattern is controlled by controlling a pressure of the
shaping air and a pressure of the pattern control air so as to match a size of the
object to be coated.
[0020] With a first unclaimed example as illustrated in FIG. 1-3, the pattern control air
nozzles (outer nozzles) 7 are located on a rear side of the shaping air nozzles (inner
nozzles) 6 in the range of 3 mm to 100 mm from the shaping air nozzles in the axial
direction of the atomizing head. Further, the pattern control air nozzles 7 are located
inside a circle having a diameter three times a diameter d of the atomizing head in
the radial direction of the atomizing head.
[0021] The reasons for the above-described locational conditions are as follows:
[0022] FIG. 2 illustrates a relationship, obtained in tests, between a paint adhesion state
and an axial distance L between the shaping air nozzles 6 and the pattern control
air nozzles 7 when coating was conducted using both the shaping air and the pattern
control air. In FIG. 2, positive L means that the pattern control air nozzles 7 are
located on the rear side of the shaping air nozzles 6, and negative L means that the
pattern control air nozzles 7 are located on the front side of the shaping air nozzles
6. The magnitude of the paint adhesion to the cap and the atomizing head is classified
into three levels ①, ② and ③. In this instance, level ① means the state where paint
adhered to the surface of the cap and the atomizing head thinly and entirely or locally
so that the adhering paint did not separate from the surfaces to fall onto the workpiece
to be coated; level ② means the state where paint adhered to the surfaces of the cap
and the atomizing head rather thickly so that when touched or vibrated the adhering
paint separated from the surfaces to fall onto the workpiece; and level ③ means the
state where paint adhered to the surface of the cap and the atomizing head very thickly
so that even during normal coating the adhering paint separated from the surfaces
to fall onto the workpiece.
[0023] As can be seen from FIG. 2, in the case where the pattern control air nozzles 7 were
located on the front side of the shaping air nozzles 6, the magnitude of paint adhesion
was great so that coating troubles would easily occur. In the case where the pattern
control air nozzles were located too far (further than 100 mm) from the shaping air
nozzles 6 on the rear side of the shaping air nozzles 6, the pattern varying ability
of the pattern control air decreased too much so that there was no meaning in provision
of the pattern control air nozzles. Therefore, the pattern control air nozzles 7 should
be located within the range of 3 mm to 100 mm from the shaping air nozzles 6 on the
rear side of the shaping air nozzles.
[0024] FIG. 3 illustrates a relationship, obtained in tests, between a paint adhesion state
and a diameter D of a circle on which the pattern control air nozzles 7 were located
when coating was conducted using both the shaping air and the pattern control air.
The magnitude of the paint adhesion is classified into three levels ①, ② and ③ discussed
above. As can be seen from FIG. 3, when the diameter D was selected to be greater
than three times the diameter of the circle on which the shaping air nozzles were
arranged (d was nearly equal to the circle on which the shaping air nozzles were arranged),
the paint adhesion was at level ③ where a coating problem easily happened. Therefore,
the diameter on which the pattern control air nozzles 7 are arranged should be equal
to or smaller than a diameter three times the diameter of the outermost portion of
the atomizing head 1. However, d is greater than D, because the circle on which the
pattern control air nozzles 7 are arranged is located radially outside the circle
on which the shaping air nozzles 6 are arranged.
[0025] The pattern control air nozzles 7 are formed in the air cap 5. To prevent the air
flow around the air cap from generating vortices, as illustrated in FIG, 1, corner
portions of the air cap 5 should be rounded, and a connecting surface connecting a
surface where the shaping air nozzles 6 are open and a surface where the pattern control
air nozzles 7 are open should be inclined from a line parallel to the axis of rotation
of the atomizing head by angle θ (more than 10 degrees). The connecting surface is
inclined radially inwardly in the frontward direction.
[0026] In the first unclaimed example vortices are prevented from being generated around
the cap and the atomizing head. More particularly, when the pattern control air is
not being expelled, since the surface where the pattern control air nozzles 7 are
open is located on the rear side of the surface where the shaping air nozzles 6 are
open, air can easily flow to the shaping air from the obliquely rear side of the shaping
air. When the pattern control air is being expelled, the pattern control air flows
easily to the shaping air from the obliquely rear side of the shaping air. As a result,
whether or not pattern control air is being expelled, vortices around the shaping
air is prevented from being generated so that paint adhesion to the air cap and the
atomizing head due to vortices generated around the shaping air and coating troubles
due to dropping of the adhering paint onto the workpiece are effectively prevented.
[0027] With an embodiment of the present invention, as illustrated in FIGS. 4 and 5, at
least one air passable opening 8 (hereinafter, opening) for permitting air to pass
therethrough is formed radially between the shaping air nozzles 6 formed in the air
cap 5 and the pattern control air nozzles 7 formed in the air cap 5.
[0028] An air passage is formed so as to connect a front surface of the air cap 5 and a
side surface (cylindrical outside surface) of the resin cover (or housing) 3, and
one end of the air passage open to the front surface of the air cap constitutes the
opening 8. As illustrated in FIG. 5, a plurality of (four in FIG. 5) openings 8 are
formed.
[0029] To the above-described structure according to the embodiment of the present invention
may be added the structure according to the first unclaimed example above discussed
or may be applied to a structure which does not have the arrangement of the pattern
control air nozzles on the side of the shaping air nozzles by 3-100 mm and the location
of the pattern control air nozzles inside the circle having the diameter three times
of the diameter of the atomizing head but has the same structure with respect to the
remaining portions as those of the structure of the first unclaimed example.
[0030] Whether or not the pattern control air is being expelled, air is easily suctioned
through the opening 8 to a negative pressure generating portion (particularly, a portion
between the shaping air flow and the pattern control air flow). As a result, an air
flow accompanying the shaping air flow is easily formed so that vortices are unlikely
to be generated around the shaping air and coating troubles are suppressed.
[0031] With a second unclaimed example as illustrated in FIGS. 6 and 7, opening 8 for permitting
air to pass therethrough is formed radially between the shaping air nozzles 6 formed
in the air cap 5 and the pattern control air nozzles 7.
[0032] The pattern control air nozzles 7 are formed in a pattern control air nozzle ring
9 which is a hollow ring. The ring 9 is radially spaced from the air cap 5 and is
supported from the air cap 5 by a support member 10. A gap between the ring 9 and
the air cap 5 constitutes the opening 8.
[0033] Whether or not the pattern control air is being expelled, air is easily suctioned
through the opening 8 to a negative pressure generating portion (particularly, a portion
between the shaping air flow and the pattern control air flow). As a result, an air
flow accompanying the shaping air flow is easily formed so that vortices are unlikely
to be generated around the shaping air and coating troubles are suppressed.
[0034] According to the present invention, the following technical advantages may be obtained:
[0035] First, since the pattern control air nozzles may be spaced from the shaping air nozzles
by 3 to 100 mm in a rear direction of the shaping air nozzles and are located inside
a circle having a diameter three times the diameter of the atomizing head, and air
flow accompanying the shaping air flow is easily formed around the shaping air flow,
so that vortices or turbulence are prevented from being generated around the shaping
air flow and paint adhesion to the air cap and the atomizing head due to the vortices
or turbulence is effectively prevented.
[0036] Second, in the case where the connecting surface connecting the surface where the
shaping air nozzles are open and the surface where the pattern control air nozzles
are open is inclined from a line parallel to the axis of rotation of the atomizing
head, generation of vortices around the air cap is more effectively suppressed.
[0037] Third, since the opening is provided radially between the shaping air nozzles and
the pattern control air nozzles, air introduction to a negative pressure generating
portion through the opening is permitted so that an air flow accompanying the shaping
air flow is easily formed and adhesion of paint to the air cap and the atomizing head
is effectively prevented.
[0038] A rotary atomizing electrostatic coating apparatus includes a plurality of shaping
air nozzles (6) disposed on a first circle having its circle center on an axis of
rotation of an atomizing head (1), a plurality of pattern control air nozzles (7)
disposed on a second circle having a larger diameter than the first circle. The pattern
control air nozzles may be located at 3-100 mm on a rear side of the shaping air nozzles
(6) and inside a circle having a diameter three times a diameter of the atomizing
head (1). An air passable opening is formed radially between the shaping air nozzles
(6) and the pattern control air nozzles (7).
1. A rotary atomizing electrostatic coating apparatus, comprising:
a housing (3);
an atomizing head (1) disposed on a front side of said housing (3), said atomizing
head (1) having an axis of rotation and being rotatable about said axis of rotation;
an air motor (2) disposed within said housing (3), constructed for and arranged to
drive said atomizing head (1);
an air cap (5) disposed on said front side of said housing (3), said air cap (5) having
a plurality of shaping air nozzles (6) formed therein and arranged on a on a first
circle having a circle center thereof on said axis of rotation of said atomizing head
(1); wherein
a plurality of pattern control air nozzles (7) is arranged on a second circle having
a circle center thereof on said axis of rotation of said atomizing head (1) and having
a larger diameter than said first circle; and wherein
said air cap (5) has a front surface and said housing (3) has an outside surface,
characterized by said housing (3) defining at least one air passage therein extending between said
front surface of said air cap (5) and said outside surface of the housing (3), said
air passage having an end opening (8) at said front surface of said air cap (5), said
opening (8) permitting air to pass through being arranged radially between said shaping
air nozzles (6) and said pattern control nozzles (7).
2. An apparatus according to claim 1, wherein said plurality of pattern control air nozzles
(7) are disposed so as to be spaced away from said plurality of shaping air nozzles
(6) by 3 - 100 mm on a rear side of said plurality of shaping air nozzles (6) in an
axial direction of said atomizing head (1) and to be located inside a circle having
a diameter three times a diameter of said atomizing head (1) in a radial direction
of said atomizing head (1).
3. An apparatus according to claim 1, wherein said plurality of pattern control air nozzles
(7) are formed in said air cap.
4. An apparatus according to claim 1, wherein each of said plurality of shaping air nozzles
(6) is inclined from a line parallel to said axis of rotation of said atomizing head
(1), whereby a shaping air flow pattern formed by shaping air expelled from said plurality
of shaping air nozzles (6) is spread in a direction away from said plurality of shaping
air nozzles (6).
5. An apparatus according to claim 3, wherein each of said pattern control air nozzles
(7) is directed to intersect said shaping air flow pattern when extended in a frontward
direction of said pattern control air nozzles (7).
6. An apparatus according to claim 3, wherein said air cap (5) includes a first front
surface portion where said plurality of shaping air nozzles are open, a second front
surface portion where said plurality of pattern control air nozzles (7) are open,
and a connecting surface connecting said first front surface portion and said second
front surface portion, said connecting surface being inclined from a line parallel
to said axis of rotation of said atomizing head (1).
1. Eine drehbare, zerstäubende, elektrostatische Beschichtungsvorrichtung aufweisend:
ein Gehäuse (3);
einen Zerstäubungskopf (1), der an einer Vorderseite des Gehäuses (3) angeordnet ist,
wobei der Zerstäubungskopf (1) eine Drehachse hat und über die Drehachse drehbar ist;
einen Luftmotor (2), der innerhalb des Gehäuses (3) angeordnet ist, wobei dieser für
den Antrieb des Zerstäubungskopfs (1) ausgelegt und angeordnet ist;
eine Luft-Abdeckung (5), die an der Vorderseite des Gehäuses (3) angeordnet ist, wobei
die Luft-Abdeckung (5) eine Vielzahl von Formgebungs-Luftdüsen (6) hat, die darin
ausgebildet und an einem ersten Kreis angeordnet ist, der einen Kreismittelpunkt auf
der Drehachse des Zerstäubungskopfs (1) hat; wobei
eine Vielzahl von Mustersteuerungs-Luftdüsen (7) an einem zweiten Kreis angeordnet
ist, der einen Kreismittelpunkt auf der Drehachse des Zerstäubungskopfs (1) und einen
größeren Durchmesser als der erste Kreis hat; und wobei
die Abdeckung (5) eine Vorderfläche und das Gehäuse (3) eine Außenseitenfläche
hat, dadurch gekennzeichnet, dass
das Gehäuse (3) zumindest einen Luftdurchgang darin definiert, der sich zwischen
der Vorderfläche der Luft-Abdeckung (5) und der Außenseitenfläche des Gehäuses (3)
erstreckt, wobei der Luftdurchgang eine End-Öffnung (8) an der Vorderfläche der Luft-Abdeckung
(5) hat, wobei die Öffnung (8) einen Luftdurchlass zulässt und radial zwischen den
Formgebungs-Luftdüsen (6) und den Mustersteuerungs-Luftdüsen (7) angeordnet ist.
2. Eine Vorrichtung gemäß Anspruch 1, wobei die Vielzahl der Mustersteuerungs-Luftdüsen
(7) so angeordnet ist, um von der Vielzahl von Formgebungs-Luftdüsen (6) um 3 - 100
mm an einer Hinterseite der Vielzahl von Formgebungs-Luftdüsen (6) in einer axialen
Richtung des Zerstäubungskopfs (1) beabstandet zu sein, und um in einem Kreis, der
einen Durchmesser hat, der dreimal so groß ist wie der Durchmesser des Zerstäubungskopfs
(1), in einer radialen Richtung des Zerstäubungskopfs (1) gelegen zu sein.
3. Eine Vorrichtung gemäß Anspruch 1, wobei die Vielzahl der Mustersteuerungs-Luftdüsen
(7) in der Luft-Abdeckung (5) ausgebildet ist.
4. Eine Vorrichtung gemäß Anspruch 1, wobei jede der Vielzahl der Formgebungs-Luftdüsen
(6) gegenüber einer Linie, die parallel zu der Drehachse des Zerstäubungskopfs (1)
ist, geneigt ist, wodurch ein formgebendes Luftströmungs-Muster in eine Richtung fort
von der Vielzahl der Formgebungs-Luftdüsen (6) ausgebreitet wird, das durch formgebende
Luft, die von der Vielzahl von Formgebungs-Luftdüsen (6) ausgestoßen wird, ausgebildet
wird.
5. Eine Vorrichtung gemäß Anspruch 3, wobei jede der Mustersteuerungs-Luftdüsen (7) so
ausgerichtet ist, um das formgebende Luftströmungs-Muster zu durchschneiden, wenn
sich dieses in einer Richtung vor den Mustersteuerungs-Luftdüsen (7) ausgebreitet
hat.
6. Eine Vorrichtung gemäß Anspruch 3, wobei die Luft-Abdeckung (5) einen ersten Vorderflächen-Abschnitt
hat, wo die Vielzahl der Formgebungs-Luftdüsen geöffnet ist, einen zweiten Vorderflächen-Abschnitt
hat, wo die Vielzahl der Mustersteuerungs-Luftdüsen (7) geöffnet ist, und eine Verbindungsfläche
hat, die den ersten Vorderflächen-Abschnitt und den zweiten Vorderflächen-Abschnitt
miteinander verbindet, wobei die Verbindungsfläche gegenüber einer Linie, die parallel
zur Drehachse des Zerstäubungskopfs (1) ist, geneigt ist.
1. Un appareil rotatif de pulvérisation électrostatique, comprenant :
un logement (3) ;
une tête de pulvérisation (1) placée à un côté frontal dudit logement (3), ladite
tête de pulvérisation (1) ayant un axe de rotation et étant capable de rotation autour
dudit axe de rotation ;
un moteur à air (2) placé dans le logement (3), construit et configuré pour entraîner
ladite tête de pulvérisation (1) ;
un chapeau d'air (5) placé à l'avant dudit logement (3), ledit chapeau d'air ayant
une pluralité de buses d'air à façonner (6) qui y sont formées et configurées sur
un premier cercle ayant son centre de cercle sur ledit axe de rotation de ladite tête
de pulvérisation (1) ; dans lequel
une pluralité de buses à air de commande de réseaux d'écoulement (7) est placée sur
un second cercle ayant son centre de cercle sur ledit axe de rotation de ladite tête
de pulvérisation (1), et ayant un diamètre plus grand que celui dudit premier cercle
; et dans lequel
ledit chapeau d'air (5) a une surface frontale et ledit logement (3) a une surface
extérieure,
caractérisé en ce que
ledit logement (3) définit un passage d'air qui s'y prolonge entre ladite surface
frontale dudit chapeau d'air (5) et ladite surface extérieure du logement (3), ledit
passage d'air ayant une ouverture d'extrémité (8) à ladite surface frontale dudit
chapeau d'air (5), ladite ouverture (8) permettant le passage de l'air étant placée
radialement entre lesdites buses d'air de façonnage (6) et lesdites buses d'air de
commande réseaux d'écoulement (7).
2. Un appareil selon la revendication 1, dans lequel la pluralité de buses de commande
de réseaux d'écoulement (7) est placée de sorte à se trouver à l'écart de ladite pluralité
de buses d'air à façonner (6) à une distance de 3 mm à 100 mm sur un côté arrière
de ladite pluralité de buses d'air à façonner (6) dans une direction axiale de ladite
tête de pulvérisation (1) et à se trouver dans un cercle ayant un diamètre de trois
fois le diamètre de ladite tête de pulvérisation (1) dans une direction axiale de
ladite tête de pulvérisation (1).
3. Un appareil selon la revendication 1, dans lequel ladite pluralité de buses d'air
de commande de réseaux d'écoulement (7) est formée dans ledit chapeau d'air.
4. Un appareil selon la revendication 1, dans lequel chacune de ladite pluralité de buses
d'air à façonner (6) est inclinée par rapport à une droite parallèle audit axe de
rotation de ladite tête de pulvérisation (1) et, de ce fait, un réseau d'écoulement
d'air à façonner formé par l'air à façonner expulsé de ladite pluralité de buses d'air
à façonner (6) est étalé dans une direction éloignée de ladite pluralité de buses
d'air à façonner (6).
5. Un appareil selon la revendication 3, dans lequel chacune desdites buses d'air de
commande de réseaux d'écoulement (7) est dirigée de sorte à rencontrer ledit réseau
d'écoulement d'air à façonner lorsqu'il s'étend dans une direction vers l'avant desdites
buses d'air de commande de réseaux d'écoulement (7).
6. Un appareil selon la revendication 3, dans lequel ledit chapeau d'air (5) comprend
une première partie de surface frontale où les buses d'air de ladite pluralité de
buses d'air à façonner sont ouvertes, une seconde partie de surface frontale où les
buses de ladite pluralité de buses de commande de réseaux d'écoulement (7) sont ouvertes,
une surface de connexion reliant ladite première partie de surface frontale et ladite
seconde partie de surface frontale, ladite surface de connexion étant inclinée par
rapport à une droite parallèle audit axe de rotation de ladite tête de pulvérisation
(1).