The disclosure relates to an air cap for a spray gun, in particular a paint spray gun, to a nozzle assembly for a spray gun, in particular a paint spray gun, and to a spray gun, in particular a paint spray gun.
According to the prior art, a spray gun, in particular a paint spray gun, at the head thereof has a paint nozzle which is screwed into the gun body. The paint nozzle at the front end thereof often has a hollow-cylindrical small plug, the material to be sprayed exiting from the front mouth thereof during operation of the spray gun. However, the paint nozzle in the front region thereof may also be conically designed. The gun head typically has an external thread by way of which an annular air nozzle having an air cap disposed therein is screwed to the gun head. The air cap has a central opening, the diameter thereof being larger than the external diameter of the small paint-nozzle plug, or of the external diameter of the front end of a conical paint nozzle, respectively. The central opening of the air cap and the small plug, or the front end of the paint nozzle, respectively, conjointly form an annular gap. The so-called atomizing air exits from this annular gap, said atomizing air in the above-described nozzle assembly generating a vacuum on the end face of the paint nozzle, on account of which the material to be sprayed is suctioned from the paint nozzle. The atomizing air impacts the paint jet, on account of which the paint jet is torn apart so as to form threads and tapes. On account of the hydrodynamic instability thereof, the interaction between the rapidly flowing compressed air and the ambient air, and by virtue of aerodynamic disruptions, these threads and tapes disintegrate so as to form droplets which are blown away from the nozzle by the atomizing air.
The air cap furthermore often has two horns which are diametrically opposed, in the outflow direction projecting beyond the mentioned annular gap and the material outlet opening. Two supply bores, that is to say horn air infeed ducts, run from the rear side of the air cap towards horn air ducts in the horns. Each horn typically has at least one horn air duct, each horn preferably having at least two horn air ducts, however. Each horn air duct on the external side thereof has a horn air opening from which the horn air exits. The horn air ducts or openings, respectively, are typically oriented such that the former in the exit direction point in the nozzle longitudinal axis towards the annular gap, such that the so-called horn air exiting from the horn air openings may influence the air or the paint jet, respectively, that has already exited from the annular gap, or the paint mist that has at least been partially created already. On account thereof, the originally conical cross section of the paint jet (round jet) or of the paint mist, respectively, at the sides thereof that face the horns is compressed and is slightly elongated in the direction that is perpendicular thereto. On account thereof, a so-called wide jet which permits a higher planar coating rate is created. Apart from deforming the paint jet, the horn air has the effect of further atomizing the paint jet.
So-called control openings may be incorporated into the front face of the air cap, so as to be radially outside the central opening. The air that exits from the control openings influences the horn air, the former in particular cushioning the impact of the horn air on the paint jet. Furthermore, the control air protects the air cap from contamination in that the former conveys paint droplets away from the air cap. Moreover, said control air contributes towards further atomization of the paint mist. The control air also acts on the round jet, causing a slight pre-deformation as well as additional atomizing here too.
Such a nozzle arrangement is above all suitable for use with a spray gun, in particular a paint spray gun, wherein not only paints but also adhesives or lacquers, in particular base and clear lacquers, both solvent-based as well as water-based, but likewise liquids for the food industry, wood-treatment agents, or other liquids may be sprayed. Spray guns may be classified in particular as hand-held spray guns and as automatic or robotic guns, respectively. Hand-held spray guns are used above all by tradesmen, in particular by painters, joiners and varnishers. Automatic and robotic guns are typically used in conjunction with a painting robot or a painting machine for industrial applications. However, it is readily conceivable for a hand-held spray gun to be integrated in a painting robot or in a painting machine.
The spray gun may have the following in particular: a grip, an upper gun body, a compressed-air connector, a trigger for opening an air valve and for moving the paint needle out of the material outlet opening of the paint nozzle, a round/wide jet regulator for setting the ratio of atomizing air to horn air in order for the paint jet to be shaped, an air micrometer for setting the spray pressure, a material-amount regulator for setting the maximum volumetric material flow, a material connector, paint ducts for conducting the material to be sprayed from a material inlet to the material outlet, compressed-air ducts, in particular wide-jet ducts for supplying the horns with air, and round-jet ducts for supplying the annular gap and the control openings with air, a suspension hook, and an analogue or digital pressure-measuring installation. However, said spray gun may also have other components from the prior art. The paint spray gun may be designed as a flow-cup spray gun, having a paint cup that is disposed above the gun body and from which the material to be sprayed flows substantially by way of gravity and by negative pressure at the front end of the paint nozzle into and through the paint ducts. However, the spray gun may also be a side-cup gun in which the paint cup is disposed laterally on the gun body, and in which the material is likewise infed to the gun by gravity and by negative pressure at the front end of the paint nozzle. However, the spray gun may also be as a suction-cup gun, having a paint cup that is disposed below the gun body, from which the material to be sprayed is suctioned substantially by negative pressure, in particular while utilizing the Venturi effect, from the cup. Furthermore, said spray gun may be designed as a pressurized-cup gun in which the cup is disposed below, above, or laterally on the gun body and is impinged with pressure, whereupon the medium to be sprayed is squeezed out of the cup. Furthermore, said spray gun may be a bucket gun in which the material to be sprayed is infed to the spray gun from a paint container by means of a hose or by way of a pump.
The above-described nozzle arrangement and spray gun have been successful for many years. The quality of the spray result depends to a large extent on the quality of the spray gun used. High-quality spray guns are manufactured with high precision to very tight production tolerances, since even deviations from the ideal dimension in the range of a few hundredths of millimeters may negatively influence the quality of atomization and thus the spray result. The quality of atomization is further determined by the accurate design of the so-called nozzle set. The nozzle set is typically composed of the air nozzle, the paint nozzle, and the paint needle. The air nozzle in turn is composed of the air cap and the annular air nozzle. The diameter of the needle tip, the internal diameter of the central opening in the air cap, of the horn air openings, and of the control openings, the angles of the openings or ducts, respectively, in relation to the central axis of the central opening, and the mutual alignment of the openings or ducts, respectively, are all relevant to the spray quality in particular.
A good atomization quality is particularly important in the application of clear and base lacquers (solid paints) to vehicles and vehicle parts. An inadequate spray quality has negative effects on the accuracy of the colour shade and the lustre of the coating in particular in the case of repair paintwork. Since the repainted vehicle part often is disposed directly next to a part having the original paintwork, any inaccuracies are clearly in evidence here. A complaint by the customer of the vehicle paint shop necessitates rework which is associated with a high expense in terms of time and costs.
It has been established in the context of spray tests that the quality of the coating does not depend only on the fineness of atomization but to a large extent also on the profile of the layer thickness of the coating across the length or height, respectively, of the spray jet, or of the spray pattern, respectively. A spray pattern is usually established in that paint or lacquer is applied by means of the spray gun, without moving the spray gun, from a specific distance, for example 15 cm to 20 cm, in front of a substrate, for example paper, a paper having a scale that is intended for establishing a spray pattern, or a sheet-metal panel. The spray duration is approx. 1 to 2 seconds. Alternatively, the spray gun may be moved by means of a device, in particular perpendicularly to the longitudinal axis of the wide jet, keeping a constant distance from the sheet-metal panel or paper. The shape of the spray pattern that has been generated in this way, and the size of the droplets on the substrate, provide a conclusion pertaining to the quality of the spray gun, in particular of the nozzles.
The layer thickness of the spray pattern may be ascertained pre or post drying of the spray pattern by means of methods known in the prior art, for example by means of layer-thickness measuring apparatuses, or the paint droplets and the size and position thereof is detected still during the flight towards the substrate, for example by means of a laser diffraction method.
A spray pattern as has been described above, across the length and the width thereof, does not have a uniform layer thickness. The central core of the spray pattern has a high layer thickness, the layer thickness generated outside the core being less. The transition in the layer thickness between the core and the external region is fluid. If the layer thickness is plotted across the length of the spray pattern, an initially flat ascent from the left to the right results, said ascent marking the external periphery of the external region. The core thickness increases relatively steeply in the proximity of the core, and in the ideal case remains substantially constant across the longitudinal profile of the core, that is to say that a plateau is displayed. The layer thickness drops relatively steeply at the periphery of the core, followed by a flatter descent towards the end of the external region. It has been demonstrated that a more uniform coating of improved quality may be generated the steeper the transition is between the core region and the external region, that is to say the steeper the profile of the layer thickness is across the length of the spray pattern when transitioning from the external region to the core region. During the painting procedure, the painter moves the activated spray gun in meandering tracks, wherein the tracks mutually overlap in a region of between 30% to 50% of the height of said tracks, that is to say that approximately the lower or the upper third of one track overlaps the upper or lower third of the preceding track, respectively. A core region of higher definition enables the painter to apply the core regions of the spray tracks during the painting procedure in as mutually adjacent a manner as possible such that a uniform overall layer thickness is created. However, the transition must also not be too steep since there is otherwise the risk of excessive coating, for example by inadvertently applying the double coating thickness, leading to so-called paint tears. The experiments have furthermore demonstrated that it is advantageous for the above-mentioned plateau to be as wide as possible, that is to say for the core region of the spray pattern having the maximum layer thickness to be as long as possible.
Accordingly, at least some embodiments disclosed provide an air cap for a spray gun, a nozzle assembly for a spray gun, and a spray gun, by way of which a better coating quality is achieved than by way of air caps, nozzle assemblies, and spray guns according to the prior art. In particular, the intention is to provide an air cap for a spray gun, a nozzle assembly for a spray gun, and a spray gun, which generate a spray pattern in which the coating thickness across the length of the spray pattern in the transition from an external region of the spray pattern to a core region increases as steeply as possible, and in which the core of the spray pattern, that is to say the region having the maximum coating thickness, is as long as possible. At the same time, despite the comparatively large core region, the spray jet is not to become too dry, and the transition from an external region of the spray pattern to a core region is not to be steep in such a manner that there is a risk of excessive coating.
In an embodiment, an air cap for a spray gun, in particular a paint spray gun, has at least one central opening, which is delimited by a mouth, and two horns, each having at least one inner and one outer horn air duct and one inner and one outer horn air opening, wherein the spacing between the front end of the central opening and an axis which perpendicularly intersects the central axis of the central opening and runs through the centre of an inner horn air opening is between 0.6 mm and 2.6 mm. This is to mean the shortest spacing between the front end of the central opening, that is to say the centre of the frontmost face of the central opening, and the intersection point of the central axis of the central opening and an axis which perpendicularly intersects the central axis of the central opening and runs through the centre of an inner horn air opening. This spacing is the so-called spot bore height of the inner horn air duct. The inner horn air ducts or openings, respectively, are those horn air ducts or openings, respectively, that are located closer to the central opening of the air cap. By contrast, the outer horn air ducts or openings, respectively, are those horn air ducts or openings, respectively, that are more remote from the central opening of the air cap and are located closer to the front end of the horn. The inner horn air ducts of the two horns of the air cap preferably have identical spot bore heights. The term “spot bore height” does not by default mean that the horn air ducts have to be incorporated into the horns by boring. The term is merely owed to the procedure according to the prior art, wherein the horn air ducts are bored into the horns. However, said horn air ducts may also be incorporated into the horns by means of a laser, or the air cap may be manufactured by means of 3D-printing, casting, or die casting, wherein the horn air ducts and other ducts and openings of the air cap are omitted. Accordingly, the horn air ducts, like other ducts and openings of the air cap, need not have a circular cross section; rather, said ducts and openings may also at least in part have a square, rectangular, triangular, oval, or other cross section. In the case of air caps according to the prior art, the spot bore height is more than 2.6 mm. A reduction in the spot bore height demonstrated one of the above-mentioned desired effects, specifically a longer core region of the spray pattern, that is to say a wider plateau in the profile of the coating thickness across the length of the spray pattern.
In an embodiment, a nozzle assembly for a spray gun, in particular a paint spray gun, has at least one paint nozzle, wherein said nozzle assembly furthermore has an above-mentioned air cap.
In an embodiment, a spray gun, in particular a paint spray gun, has an above-mentioned air cap or an above-mentioned nozzle assembly.
Advantageous design embodiments are also disclosed.
An air cap in which the spacing between the front end of the central opening and an axis which perpendicularly intersects the central axis of the central opening and runs through the centre of an inner horn air opening is between 2.4 mm and 2.6 mm is particularly preferable. Spraying experiments have shown that the spot bore height of the inner horn air ducts cannot be reduced in an arbitrary manner. While a further widening of the above-mentioned plateau indeed results, the sprayed material by virtue of the constant throughput of material is distributed across a larger core region, and the spray jet becomes too dry. A spot bore height between 2.4 mm and 2.6 mm for the inner horn air ducts has been established as a good compromise between as wide a plateau as possible and adequate wetness, that is to say an adequate coating thickness, while the air cap, in particular in terms of the control bores, is otherwise designed in the same manner. If and when the spot bore height is further reduced, further adaptation of the air cap becomes necessary, as will be described in more detail further below.
In the case of one preferred embodiment of the air cap according to the disclosure, the angle between the central axis of an inner horn air duct and the central axis of the central opening is between 53° and 60°, particularly preferably between 57° and 60°. The angle is enlarged in comparison to standard air caps, that is to say to air caps according to the prior art.
In the case of the air cap according to the disclosure, the spacing between the front end of the central opening and an axis which perpendicularly intersects the central axis of the central opening and runs through the centre of an outer horn air opening is preferably between 6.0 and 6.6 mm, particularly preferably between 6.2 and 6.4 mm. According to the above description this is to mean the shortest spacing between the front end of the central opening, that is to say the centre of the frontmost face of the central opening, and the intersection point of the central axis of the central opening and an axis which perpendicularly intersects the central axis of the central opening and runs through the centre of an outer horn air opening. This spacing is the spot bore height of the outer horn air duct. In the case of conventional nozzles, the spot bore height of the outer nozzles is approximately 5 mm to 6 mm. In the case of the present disclosure, the spot bore height has thus been increased, the outer horn air ducts or openings, respectively, having been placed further towards the outside. The length of the horns may remain the same as in the prior art, but the horns may also be extended in length.
The angle between the central axis of an outer horn air duct and the central axis of the central opening is preferably between 78° and 82°, particularly preferably between 79° and 80.5°. The angle has been enlarged in comparison to standard nozzles in which the angle is below 75°. As is the case with the inner horn air ducts, the enlargement of the angles causes a harder impact of the horn air on the paint jet and thus improved atomizing.
In the context of the present disclosure the angle between the central axis of an outer horn air duct and the central axis of the central opening is defined as the spot bore angle of the outer horn air duct, the angle between the central axis of an inner horn air duct and the central axis of the central opening being defined as the spot bore angle of the inner horn air duct. The ratio of the spot bore angle of the outer horn air duct to the spot bore angle of the inner horn air duct is particularly preferably between 1.2 and 1.6. The spot bore angle of the outer horn air duct is thus 1.2 to 1.6 times the size of the spot bore angle of the inner horn air duct.
The spacing between an axis which perpendicularly intersects the central axis of the central opening and runs through the centre of an inner horn air opening, and an axis that, parallel with this axis, runs through the centre of an outer horn air opening is preferably between 3.3 mm and 5.8 mm, particularly preferably between 3.4 mm and 4.2 mm. This dimension is the spacing between the inner and the outer horn air opening along the central axis of the central opening, that is to say the difference between the spot bore heights of the inner and the outer horn air duct. The horn air openings in the case of the present disclosure are spaced wider apart than in the case of conventional nozzles in which the dimension is typically below 3 mm.
The internal diameter of at least one inner horn air opening is preferably between 1.1 mm and 1.3 mm, particularly preferably 1.2 mm.
The internal diameter of at least one outer horn air opening is preferably between 1.4 mm and 1.6 mm, in particular 1.5 mm.
As has already been mentioned above, the spacing between the front end of the central opening and an axis which perpendicularly intersects the central axis of the central opening and runs through the centre of an outer horn opening is the so-called spot bore height of the outer horn air opening. The ratio of the spot bore height of the outer horn air opening to the internal diameter of the outer horn air opening is preferably between 3.8 and 4.5.
Accordingly, the spacing between the front end of the central opening and an axis which perpendicularly intersects the central axis of the central opening and runs through the centre of an inner horn air opening is the spot bore height of the inner horn air opening. The ratio of the spot bore height of the inner horn air opening to the internal diameter of the inner horn air opening is preferably between 1.7 and 2.4.
The ratio of the spot bore height of the outer horn air opening to the spot bore height of the inner horn air opening is particularly preferably between 2.0 and 3.0.
The central axes of the inner and outer horn air ducts are preferably perpendicular to the faces into which the horn air ducts are incorporated. This has the advantage that the risk of the drill slipping away during boring of the horn air ducts is lower than in the case of the ducts being bored into a face which is inclined in relation to the central axis of the drill. The bores may be positioned more accurately. Furthermore, openings having a circular cross section are generated by perpendicular boring, this being particularly desirable in the present case. Openings having an elliptic cross section would be created in the case of boring of the ducts into a face which is inclined in relation to the central axis of the drill. The faces into which the bores are incorporated, that is to say the internal faces of the horns, may be curved.
The air cap in the region next to the mouth that delimits the central opening particularly preferably has control openings. These control openings which are preferably designed as bores reach into the interior of the air cap and therein are supplied with air. The air that exits from the control openings, the so-called control air, impacts the horn air exiting from the horn air openings, deflects the latter and spreads the horn air jet, that is to say widens the latter, damping the horn air jet. The control air also acts on the round jet, causing a slight deformation as well as additional atomization here too. In both cases, the control air contributes towards further atomization of the paint jet, reducing the contamination of the air cap by the spray mist, since said control air conveys the latter away from the air cap.
In particular, the air cap in each case may have three control openings that are disposed on two mutually opposite sides of the central opening and are disposed in the form of a triangle, wherein a tip of the triangle is aligned in the direction of the inner or outer horn air openings. The control openings may have the same diameter, advantageously between 0.5 mm and 0.6 mm.
In the case of one preferred exemplary embodiment of the air cap according to the disclosure, the spacing between the front end of the central opening and an axis which perpendicularly intersects the central axis of the central opening and runs through the centre of an inner horn air opening is between 0.6 mm and 1.2 mm, and the air cap in the region next to the mouth that delimits the central opening furthermore in each case has two control openings that are disposed on two mutually opposite sides of the central opening, wherein the control openings are disposed so as to be roughly in line with the inner or outer horn air openings. As has been described above, the spot bore height of the inner horn air opening may not be reduced in an arbitrary manner since the spray jet would otherwise become too dry. In order for this to be prevented, the design of the control openings is modified as described. Instead of the above-mentioned triangular arrangement of three control openings, a linear arrangement of two control openings is preferred. “Linear” means that in the plan view onto the air cap, a line through the horn air openings also runs through the control openings. This line is preferably a centreline.
An air cap in which the control openings that are disposed in the region next to the mouth that delimits the central opening in relation to the central axis of the central mouth enclose an angle of 8° to 12° is particularly preferred. Said control openings here are preferably inclined in the direction of the spray jet such that the control air may impact the horn air or the round jet. Particularly preferably, the angle of the inner control opening, that is to say that control opening that is disposed closer to the central opening, is between 9° and 11°, the angle of the outer control openings, that is to say those control openings that are disposed so as to be more remote from the central opening, being between 7° and 9°.
The central axes of the control openings are preferably perpendicular to the faces of the region into which the control openings are incorporated. In a manner similar to the horn air openings, this here too has the advantage that the risk of the drill slipping away during boring of the control openings is lower than in the case of the ducts being bored into a face which is inclined in relation to the central axis of the drill. The bores may be positioned more accurately. Furthermore, openings having a circular cross section are generated by perpendicular boring, this being particularly desirable in the present case. Openings having an elliptic cross section would be created in the case of boring of the openings into a face which is inclined in relation to the central axis of the drill.
An air cap in which the internal diameter of the central opening is between 3.5 mm and 3.7 mm is preferred. The wall thickness of the mouth that delimits the central opening is preferably between 0.60 mm and 0.75 mm, in particular in the front region thereof.
The mouth that delimits the central opening preferably has a conical external shape, wherein the central axis of the central opening in relation to the external face of the mouth that delimits the central opening encloses an angle of 25° to 35°. The flows that prevail on the air cap, in particular the spray jet, cause an entrainment of ambient air. It must be guaranteed that sufficient ambient air may flow in at all times, since turbulences that negatively influence the spray quality otherwise arise on the external region of the spray jet. For this reason, so as to enable a readier inflow of ambient air, the largest part of the air-nozzle front face is also designed so as to be slightly conical. However, the region about the mouth that delimits the central opening is chamfered in such a manner that the face in the direction of the mouth that delimits the central opening is slightly depressed. This chamfer also has the purpose of reducing the contamination of that region by the spray mist.
An air cap in which the central axes of an inner horn air opening and of an outer horn air opening intersect at a point that lies on the central axis of the central opening of the air cap is particularly preferable. The inner and outer horn air openings thus target the same point, or the same region on the spray jet, respectively. By virtue of the deflection and the spreading, that is to say the widening, of the horn air jet by the control air the actual impact point or region, respectively, of the horn air on the spray jet is more remote from the air cap than this intersection point of the central axes of the horn air openings and the central axis of the central opening. On account thereof it may furthermore be the case that the air from the inner horn air openings does not impact the spray jet in the same region as the air from the outer horn air openings.
The spacing between the front end of the central opening and the intersection point of the central axes of an inner horn air duct and of an outer horn air duct is preferably between 7.5 mm and 8.5 mm.
The ratio of the spacing of a horn air duct from the intersection point of the central axis of an outer control opening and the central axis of the horn air duct to the spacing of the intersection point of the central axis of the outer control opening and the central axis of the horn air duct from the intersection point of the central axis of the horn air duct and the central axis of the central opening of the air cap is preferably between 50:50 to 65:35. This means that the central axis of an outer control air opening intersects the central axis of at least one horn air opening approximately half-way between the horn air opening and the intersection point of the horn air opening and the central axis of the central opening, or is somewhat closer to the central axis of the central opening.
In the case of the air cap according to the disclosure, the centres of the horn air openings of both horns are preferably in line with the centre of the central opening. This means that in the plan view onto the air cap, a line through the centres of the horn air openings also runs through the centre of the central opening of the air cap. This line is preferably a centreline.
The air cap is preferably composed of brass which, prior to being coated preferably by a galvanic method, initially is hot-pressed into a shape that is similar to the completed air cap. The semi-finished product is subsequently machined to completion by turning various faces and boring the openings. Thereafter, the air cap may be connected to an annular air nozzle and be attached to a spray gun. Of course, the air cap may also be composed of another material, for example from another metal or from plastics, and be manufactured by means of a casting or die-casting method, or by means of 3D-printing, and may be non-coated or be coated by means of another coating method.
In the case of one preferred embodiment of the nozzle assembly according to the disclosure, the paint nozzle on the external side in the region of the front end thereof has at least three V-shaped slots, wherein the bases of the V-shaped slots converge towards the front, in the direction of a central axis of the paint nozzle. The depth of the V-shaped slots, that is to say of the slots having a V-shaped cross section, increases in the direction towards the paint outlet of the paint nozzle. The bases of the V-shaped slots may intersect the internal diameter of the paint nozzle already ahead of the front end of the paint nozzle, or the bases of the V-shaped slots may intersect the internal diameter of the paint nozzle substantially exactly at the front end of the paint nozzle. However, the bases of the V-shaped slots preferably do not intersect the internal diameter of the paint nozzle, that is to say that the bases of the V-shaped slots are spaced apart from the internal diameter of the paint nozzle at the front end of the paint nozzle. The V-shaped slots cause additional atomizing of the paint, in addition to the atomization at the central opening of the air cap. The bases of the slots in relation to the central axis of the paint nozzle preferably enclose an angle of 30° to 45°. In the case of this impact angle of the atomizing air onto the paint jet, the Sauter mean diameter (SMD) is at the minimum, and the uniformity of atomization is best. The front end face of the paint nozzle may be conically designed, that is to say that the paint nozzle widens in the direction of the outlet thereof. The opening angle is preferably between 80° and 100°. The internal face of the conical end face preferably does not intersect the external face of the paint nozzle at the front end of the paint nozzle, but a region of the front end face between the conical internal face and the cylindrical external face of the paint nozzle is designed so as to be planar. A vacuum that suctions the paint from the paint nozzle may be configured on this planar region when the atomizing air exits from the annular gap between the air cap and the paint nozzle.
The paint nozzle of a nozzle assembly according to the disclosure may be conically designed in the front region thereof. This means that the paint nozzle at the front end thereof does not have a small hollow-cylindrical plug, but that the atomizing air is guided into the paint jet substantially at an angle that corresponds to the angle of the external face of the conical paint nozzle in relation to the central axis of the paint nozzle. The angle of the external face of the conical paint nozzle in relation to the central axis of the paint nozzle preferably is between 30° and 45°, since the Sauer mean diameter (SMD) is at the minimum here, and the uniformity of atomization is best, as has already been described above.
The air cap according to the disclosure is particularly suitable for use in a nozzle assembly for a spray gun, in particular a paint spray gun. Said air cap may be used conjointly with an annular air nozzle and a paint nozzle with a spray gun. This herein may be all types of spray guns for spraying various media, as have been described above.
The spray gun may have a hollow needle which may be designed for conducting material for spraying or compressed air. For example, a higher throughput of material, or spraying bi-component material, is possible by way of a hollow needle that conducts material for spraying. To this end, the hollow needle is connected directly or indirectly to a supply of material. If and when the hollow needle is designed so as to conduct compressed air, said needle by way of expelling atomizing air may contribute towards atomizing the material for spraying. To this end, the hollow needle is connected directly or indirectly to a supply of compressed air. In all cases, the hollow needle may be designed for conducting an arbitrary volumetric flow. A person skilled in the art will be familiar with the fact that the throughput depends on the internal diameter of the hollow needle and on the input pressure and the volumetric flow.
The spray gun according to the disclosure may furthermore of course also have other components or design embodiments according to the prior art.
The disclosure will be explained in more detail hereunder in an exemplary manner by means of the drawings in which:
In the present exemplary embodiment, the central axes 16, 18 of all four horn air ducts 15, 17 meet at a point D which lies on the central axis 9 of the central opening 7. The point C marks the spot bore height of the outer horn air ducts 17, the point B marking the spot bore height of the inner horn air ducts 15. The spot bore height of an inner horn air duct 15 is the spacing between the front end A of the central opening 7 in the air cap 7 and an axis 21 which perpendicularly intersects the central axis 9 of the central opening 7 and runs through the centre of the inner horn air opening 15a. The spot bore height of an outer horn air duct 17 is the spacing between the front end A of the central opening 7 in the air cap 1 and an axis 23 which perpendicularly intersects the central axis 9 of the central opening 7 and runs through the centre of the outer horn air duct 17a. In the present exemplary embodiment, the spot bore height of the two inner horn air ducts 15 is in each case identical, as is the spot bore height of the two outer horn air ducts 17.
The central axes 6 of the horn air infeed ducts 5 in relation to the central axis 9 are slightly inclined, that is to say that the horn air infeed ducts 5 are incorporated into the air cap 1 in a slightly oblique manner. The reason is that the horn air ducts 15, 17 are to be designed to be as long as possible so as to achieve guiding of the horn air for as long as possible, which is why the horn air infeed ducts 5 should be disposed in the air cap 1 so as to be as far out as possible, whereas at the same time the external wall of the air cap 1 in this region, by virtue of a groove 13 in the air cap 1, would become too thin if the horn air infeed ducts 5 were to be incorporated into the air cap 1 as far out as possible in parallel with the central axis 9. By way of the inclined horn air infeed ducts 5 there is an adequate wall thickness also in the region of the groove 13, with an adequate length of the horn air ducts 15, 17. The groove 13 which is preferably designed in an encircling manner serves for receiving a locking ring (not shown in
Control openings 25 are disposed in the region next to the mouth 11 that delimits the central opening 7. Only two control openings 25 which are disposed on the sectional line through the air cap 1 can be seen in
As can be seen in
The region 29 next to the central opening 7, or next to the mouth 11 that delimits the central opening 7, respectively, differs from that region 33 that in
The spray pattern 43 illustrated in
A diagram 45 which shows a layer thickness profile in μm over a measuring position in mm is illustrated in the lower part of
A horizontal stripe was generated in the course of the spraying experiment, wherein the layer thickness of the spray pattern was measured in the vertical direction in a central region of the stripe. The measuring position 0 mm in the diagram 45 corresponds to the position of the central axis 9 of the central opening 7 in the air cap 1 of
It can be seen in the diagram 45 that the zero point of the layer thickness in the case of the standard nozzle as well as in the case of the new nozzle lies at the outer end of the spray pattern, at the left end in
It is finally to be pointed out that the exemplary embodiments described only describe a limited selection of potential embodiments and thus do not represent any limitation of the present disclosure.
Number | Date | Country | Kind |
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10 2015 016 474 | Dec 2015 | DE | national |
Number | Name | Date | Kind |
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40433 | Sees | Oct 1863 | A |
327260 | Hart | Sep 1885 | A |
459432 | Anderson | Sep 1891 | A |
459433 | Avery | Sep 1891 | A |
548816 | Paul | Oct 1895 | A |
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20170173600 A1 | Jun 2017 | US |