Abstract
A nozzle for a spray gun, in particular a paint spray gun, has at least one material nozzle having a hollow portion for the passage of material to be sprayed; a material outlet opening; and a disk element extending radially from the material nozzle and having at least one passage opening. The nozzle has at least one first baffle disk which is arranged on the disk element and has an inner and an outer circumference. The first baffle disk is arranged on the disk element directly, in particular without a sealing element arranged inbetween. The disadvantages that separate sealing elements have to be specially produced and may be lost or damaged, can thereby be avoided. The nozzle according to the disclosure and related nozzle sets, paint spray guns and methods for producing nozzles are functionally reliable, have only few individual parts and a compact design and are quiet.
Claims
1. A nozzle for a spray gun comprising: a material nozzle having a hollow portion for the passage of material to be sprayed and a material outlet opening; and a disk element extending radially from the material nozzle and having a passage opening, wherein the nozzle has a first baffle disk which is arranged on the disk element and has an inner and an outer circumference, and wherein the first baffle disk is arranged on the disk element directly, without a sealing element arranged inbetween.
2. The nozzle according to claim 1, wherein the first baffle disk is configured from continuous material in a region between the inner circumference and the outer circumference, such that the first baffle disk does not have any passage openings.
3. The nozzle according to claim 1, wherein the disk element has at least two contact surfaces arranged substantially at right angles to each other, wherein the first baffle disk has at least two contact surfaces arranged substantially at right angles to one another, and wherein the contact surfaces of the first baffle disk lie at least in regions against the contact surfaces of the disk element.
4. The nozzle according to claim 1, wherein a surface of the first baffle disk facing away from the material outlet opening, is set back along an axis in relation to a surface of the disk element facing away from the material outlet opening.
5. The nozzle according to claim 1, wherein the first baffle disk has a greater outer circumference than the disk element.
6. The nozzle according to claim 1, wherein the first baffle disk and the disk element each have a circular outer circumference and are arranged concentrically with respect to each other.
7. The nozzle according to claim 1, wherein the disk element has a first surface facing away from the material outlet opening and a second surface facing away from the material outlet opening, and wherein the first surface and the second surface are connected to each other in a stepped manner via a third surface.
8. The nozzle according to claim 1, wherein a surface of the disk element facing away from the material outlet opening has a groove.
9. The nozzle according to claim 1, wherein an end of the nozzle that faces away from the material outlet opening has an external thread for fastening in or to at least one of a main body and a sealing element.
10. The nozzle according to claim 1, wherein the nozzle has a second baffle disk which is arranged on a side of the first baffle disk which faces away from the material outlet opening, and which is spaced apart from the passage opening in the disk element in the axial direction and which at least partially projects over the passage opening in the disk element in a radial direction.
11. The nozzle according to claim 10, wherein the second baffle disk has a smaller outer circumference than the first baffle disk.
12. The nozzle according to claim 10, wherein the second baffle disk has a circular outer circumference and is arranged concentrically with respect to at least one of the first baffle disk and the disk element.
13. The nozzle according to claim 10, wherein the first baffle disk and the second baffle disk are configured integrally.
14. The nozzle according to claim 12, wherein the outer diameter of the first baffle disk is between 29.0 mm and 30.5 mm and the outer diameter of the second baffle disk is between 20.0 mm and 21.5 mm.
15. The nozzle according to claim 1, wherein the nozzle has an air-directing disk which is arranged downstream of the passage opening of the disk element in the direction of the nozzle longitudinal axis.
16. The nozzle according to claim 1, wherein the first baffle disk has an outer collar which is arranged on a side of the first baffle disk which faces away from the material outlet opening, and which is arranged on the outer circumference of the first baffle disk, and/or the first baffle disk has an inner collar which is arranged on the side of the first baffle disk which faces away from the material outlet opening and is arranged on the inner circumference of the first baffle disk.
17. The nozzle according to claim 16, wherein the outer collar has at least one oblique surface.
18. The nozzle according to claim 16, wherein the outer diameter of the first baffle disk is between 30.5 mm to 31.5 mm.
19. A nozzle set for a spray gun having at least one nozzle according to claim 1, wherein the nozzle set includes an air cap with a central opening and at least one diametrically opposite horn-air bore.
20. The nozzle set according to claim 19, wherein the nozzle set furthermore has a needle for closing the material outlet opening of the at least one nozzle.
21. A spray gun having a main body and the nozzle according to claim 1, wherein the first baffle disk is arranged downstream of at least one radially outer air outlet opening in the main body in a direction of the nozzle longitudinal axis and is spaced apart from the at least one radially outer air outlet opening in the axial direction and at least partially projects over the at least one radially outer air outlet opening in the radial direction.
22. The spray gun according to claim 21, wherein the spray gun has a second baffle disk, and wherein the second baffle disk is arranged downstream of the at least one radially inner air outlet opening in the main body in the direction of the nozzle longitudinal axis and is spaced apart from the at least one radially inner air outlet opening in the axial direction and at least partially projects over the at least one radially inner air outlet opening in the radial direction.
23. The spray gun according to claim 21, wherein the main body has an outer wall and a middle wall, and wherein the first baffle disk has an outer collar, and wherein the outer collar of the first baffle disk, forms a gap together with the outer wall of the main body, and/or in that the first baffle disk has an inner collar which is arranged directly next to the middle wall of the main body in the radial direction.
24. A spray gun having a main body and the nozzle set according to claim 19, wherein the main body has at least one radially outer air outlet opening, at least one radially inner air outlet opening, and a middle wall lying inbetween, and wherein the spray gun has at least one first air flow path which runs from the at least one radially inner air outlet opening, past the inner circumference of the first baffle disk, through the at least one passage opening of the disk element, into an air cap chamber formed by the air cap and the at least one nozzle, and through a gap which is formed by a front region of the at least one nozzle and the central opening in the air cap, and/or wherein the spray gun has at least one second air flow path which is separated from the first air flow path and which runs from the at least one radially outer air outlet opening, past the outer circumference of the first baffle disk, past an outer circumference of the disk element, into at least one horn-air supply duct in the air cap and through the at least one horn-air bore.
25. The spray gun according to claim 24, wherein sealing between the first air flow path and the second air flow path takes place by at least a part of the air cap, the disk element, the first baffle disk and the middle wall of the main body of the spray nozzle.
26. The spray gun according to claim 24, wherein the nozzle has a second baffle disk, which is arranged in the first air flow path.
27. A method for producing the nozzle for a spray gun according to claim 1, the method comprises: pressing the first baffle disk and a second baffle disk onto at least one of the material nozzle and the disk element, wherein the first baffle disk and the second baffle disk are arranged in such a manner that the second baffle disk is arranged on a side of the first baffle disk which faces away from the material outlet opening and is spaced apart in the axial direction from the passage opening in the disk element and at least partially projects over the passage opening in the radial direction.
28. The method according to claim 27, wherein after the pressing step a surface of the disk element facing away from the material outlet opening forms a stop for the first baffle disk and/or the second baffle disk.
29. The method according to claim 27, wherein before the pressing step, the first baffle disk and the second baffle disk are manufactured integrally.
30. A method for producing the nozzle for a spray gun according to claim 1, wherein the nozzle is produced integrally by 3D printing.
Description
BRIEF DESCRIPTION OF THE DRAWINGS
[0064] The disclosure will be explained in more detail below by way of example with reference to the following figures, in which:
[0065] FIG. 1 shows part of a spray gun, partially shown in an exploded view, with an air distributor ring according to the prior art disclosed in Chinese utility model document ZL 2014 2 0431026.7;
[0066] FIG. 2 shows a top view of a head region of a main body of a spray gun according to the prior art disclosed in said Chinese utility model document;
[0067] FIG. 3 shows a sectional view of a head region of a spray gun according to the prior art disclosed in Chinese utility model document ZL 2016 2 0911120.1;
[0068] FIG. 4 shows an exploded view of an exemplary embodiment of a spray gun according to the disclosure or a spray gun having an exemplary embodiment of a nozzle according to the disclosure or a nozzle set according to the disclosure;
[0069] FIG. 5 shows a sectional view of a main body for an exemplary embodiment of a spray gun according to the disclosure or of a main body for use with an exemplary embodiment of a nozzle according to the disclosure or a nozzle set according to the disclosure;
[0070] FIG. 6 shows a sectional view of the head region of a main body for an exemplary embodiment of a spray gun according to the disclosure or a main body for use with an exemplary embodiment of a nozzle according to the disclosure or a nozzle set according to the disclosure;
[0071] FIG. 7 shows a perspective view of the head region of a main body for an exemplary embodiment of a spray gun according to the disclosure or a main body for use with an exemplary embodiment of a nozzle according to the disclosure or a nozzle set according to the disclosure;
[0072] FIG. 8 shows a perspective view of an exemplary embodiment of a nozzle according to the disclosure;
[0073] FIG. 9 shows a perspective view of the exemplary embodiment of a nozzle according to the disclosure from FIG. 8 from a different side;
[0074] FIG. 10 shows a view from the rear of the exemplary embodiment of a nozzle according to the disclosure from FIG. 8;
[0075] FIG. 11 shows a sectional view of the exemplary embodiment of a nozzle according to the disclosure from FIG. 8;
[0076] FIG. 12 shows a sectional view of the head region of an exemplary embodiment of a spray nozzle according to the disclosure or a main body equipped with an exemplary embodiment of a nozzle according to the disclosure from FIG. 8 or a main body equipped with an exemplary embodiment of a nozzle set according to the disclosure;
[0077] FIG. 13 shows a perspective view of a second exemplary embodiment of a nozzle according to the disclosure;
[0078] FIG. 14 shows a perspective view of the exemplary embodiment of a nozzle according to the disclosure from FIG. 13 from a different side;
[0079] FIG. 15 shows a view from the rear of the exemplary embodiment of a nozzle according to the disclosure from FIG. 13;
[0080] FIG. 16 shows a sectional view of the exemplary embodiment of a nozzle according to the disclosure from FIG. 13; and
[0081] FIG. 17 shows a sectional view of the head region of an exemplary embodiment of a spray nozzle according to the disclosure or a main body equipped with the exemplary embodiment of a nozzle according to the disclosure from FIG. 13 or a main body equipped with an exemplary embodiment of a nozzle set according to the disclosure.
DETAILED DESCRIPTION
[0082] The part of a spray gun 100, in particular paint spray gun, as is shown in FIG. 1, according to the prior art, has a main body 102 with various accessory parts. An air-distributor ring 104 is shown which can be arranged on the head region 103 of the main body 102. For this purpose, the air-distributor ring 104 has at least one, in the present example two, holding pins 106a and 106b which are inserted into two blind holes 108a and 108b, which correspond to the holding pins 106a and 106b and are illustrated in FIG. 2, in order to fasten the air-distributor ring 104 to the gun head or to the head region 103 of the main body 102 in such a manner that the wall 107 of the air-distributor ring 104 lies in a sealing manner against the front surface 110 of the head region 103 of the main body 102, as is shown in FIG. 3. The head region 103 shown in FIG. 3 is disclosed in Chinese utility model document ZL 2016 2 0911120.1. An atomizer-air outlet opening 114 in the front surface 110 of the head region 103 of the main body 102 lies here within the wall 107 of the air-distributor ring 104. From the atomizer-air outlet opening 114, atomizer air flows into an inner air-distributor chamber 116 which is formed by the air-distributor ring 104 and the main body 102. A horn-air outlet opening 112 in the front surface 110 of the head region 103 of the main body 102 lies outside the wall 107 of the air-distributor ring 104. From the horn-air outlet opening 112, horn air flows into an outer air-distributor chamber 118 of the air-distributor ring 104.
[0083] On a surface within the wall 107, the air-distributor ring 104 has a plurality of passages 120 which are distributed over its circumference and through which the atomizer air flows out of the radially inner air-distributor chamber 116. From the passages 120, the atomizer air flows to a plate 124 which is arranged integrally on the paint nozzle 122 and lies in a sealing manner against a wall 109 of the air-distributor ring 104, wherein the wall 109 is arranged on that side of the air-distributor ring 104 which faces away from the front surface 110 of the head region 103 of the main body 102. The plate 124 has a plurality of passage bores 126 distributed over its circumference. The air which is flowed through the passage bores 126 subsequently flows through an annular gap 130 between the central opening of the air cap 132 and the front end of the paint nozzle 122, which can be configured in the form of a spigot.
[0084] The outer air-distributor chamber 118 of the air-distributor ring 104 forms a gap together with an outer wall 134 on the head region 103 of the main body 102, through which gap the horn air flows out of the radially outer air-distributor chamber 118. From there, the air flows into the horn-air supply ducts in the air cap 132 and subsequently into the horn-air bores 136, from the openings of which the air emerges.
[0085] FIG. 4 shows an exploded view of an exemplary embodiment of a spray gun 1 according to the disclosure or a main body 2 which is equipped with an exemplary embodiment of a nozzle 24 according to the disclosure or a nozzle set according to the disclosure or is equipped with a nozzle produced according to a method of the disclosure and has further accessory parts. The spray gun 1 can have a cup 3 for receiving and dispensing the material to be sprayed, wherein the cup comprises a lid 3b with a valve stopper 3a, a cup body 3c and a plug-in sieve 3d. Furthermore, the spray gun 1 can comprise a material-quantity-regulating device 11, an air micrometer 13, a fan control 9, a trigger guard system 7 consisting of a trigger guard and fastening means, and an air connection which can be configured as a standard connection 4a or as a rotary-joint connection 4b. A nozzle arrangement for a nozzle set comprising a nozzle 24, which can comprise a material nozzle 40, can be arranged on the head region 6 of the main body 2. In addition, the nozzle set can comprise an air cap 76 which can be fastened, in particular can be screwed, to the head region 6 via an air nozzle ring 74. The head region 6, the nozzle 24 and the air cap 76 with an air nozzle ring 74 are arranged or can be arranged here coaxially along an axis Z which here constitutes the abovementioned central or longitudinal axis of the head region 6 of the main body 2, the central or longitudinal axis of the material nozzle 40, the central or longitudinal axis of the upper part of the main body 2 and the central or longitudinal axis of a receiving opening for receiving the material-quantity-regulating device 11.
[0086] FIG. 5 illustrates a sectional view of the main body 2 for a spray gun from FIG. 4, wherein the section is undertaken from the top downwards through the axis Z from FIG. 4. The main body which is shown is suitable in particular for use with a nozzle according to the disclosure, a nozzle set according to the disclosure and/or a nozzle produced according to a method according to the disclosure and/or can be used in particular for producing a spray gun according to the disclosure. The main body 2 has a multiplicity of bores; in the upper part of the main body 2 in particular a plurality of bores along an axis Z, which here constitutes the abovementioned central or longitudinal axis of the head region 6 of the main body 2. In the present exemplary embodiment, said axis is the same as the central or longitudinal axis of the material nozzle 40, which can be arranged in or on the main body 2, from FIG. 4 and the same as the central or longitudinal axis of the upper part of the main body 2 and the same as the central or longitudinal axis of a receiving opening 82 for receiving a material-quantity-regulating device 11, which is shown by way of example in FIG. 4.
[0087] As can be seen in FIG. 5, the middle wall 12 is clearly set back in the axial direction in relation to the outer wall 14, wherein the direction of the axis Z is meant by axial direction. The spray direction or the side of the main body 2 on which the material nozzle 40 from FIG. 4 can be arranged is considered here to be at the front, and the opposite side or opposite direction, here the side with the receiving opening 82 as at the rear. The fact that the front end of the middle wall 12 is set back in the axial direction in relation to the front end of the outer wall 14 means that the front end of the outer wall 14 is further at the front than the front end of the middle wall 12.
[0088] In the present exemplary embodiment, the inner wall 10 is only slightly set back in relation to the middle wall 12.
[0089] In FIG. 5, only a single atomizer-air duct 64 can be seen, as can a horn-air duct 66 which intersects a second horn-air duct. In addition, the sectional view shows part of a fan control air-distributor chamber 68.
[0090] FIG. 6 shows a sectional view of a part of the main body 2 for a spray gun 1, which part is shown in a different sectional view in FIG. 5. The section shown in FIG. 6 is again undertaken through the axis Z from FIG. 4, but along a section plane which is perpendicular to the section plane used in FIG. 5. In FIG. 6 here, it can be seen that the inner wall 10 of the head region 6 of the main body 2 of the spray gun 1 is set back in the axial direction by a distance d4 in relation to the middle wall 12. The middle wall 12 in turn is set back in the axial direction by a distance d3 in relation to the outer wall 14. In other words, the outer wall 14 projects over the middle wall 12 which, in turn, projects over the inner wall 10. The inner wall 10 and the outer wall 12 delimit a first air-distributor chamber 60, and the middle wall 12 and the outer wall 14 delimit a second air-distributor chamber 62. Towards the front, i.e. in the spray direction, the air-distributor chambers 60 and 62 are open, and, towards the rear, they are bounded at least in regions by a first front surface 16 and a second front surface 18, respectively. In the present exemplary embodiment, a groove 19 is introduced into the second front surface 18, the bottom surface of which groove bounds the air-distributor chamber 62 instead of the second front surface 18 to the rear in regions. The air-distributor chamber 62 is therefore bounded towards the rear, i.e. in regions, by the second front surface 18 and in regions by the bottom surface of the groove 19. The distance d5, i.e. the depth of the groove 19, i.e. the distance between the second front surface 18 and the bottom surface of the groove 19, can be, for example, approx. 1.5 mm to 3.0 mm. The distance d1 between the first front surface 16 and the front end of the outer wall 14 is preferably between 8 mm and 12 mm, particularly preferably between 9 mm and 11 mm. The distance d2 between the second front surface 18 and the front end of the outer wall 14 is preferably between 4 mm and 6 mm. The middle wall 12 here is set back in the axial direction by a distance d3, which is preferably approx. 2 mm to 4 mm, in relation to the outer wall 14. The inner wall 10 is preferably set back in relation to the middle wall 12 only by 0.1 mm to 1.0 mm. This is the distance d4. The exemplary embodiment, shown in FIG. 6, of a head region 6 of a main body according to the disclosure has a mating sealing surface 84 for a sealing element, not shown in FIG. 6. The distance d6 of said mating sealing surface 84 from the first front surface 16 is preferably approximately 1.5 mm to 3.0 mm. The first front surface 16 is set back in the axial direction in relation to the second front surface 18. In the present exemplary embodiment, the distance d7 by which the front surface 16 is set back in relation to the second front surface 18, is approx. 4 mm to 6 mm. In spray tests, the dimensions or dimension combinations mentioned have proven advantageous for good atomization quality, in particular in conjunction with a nozzle according to the disclosure, a nozzle set according to the disclosure and a nozzle produced according to a method of the disclosure.
[0091] FIG. 7 shows a perspective view of a part of the main body 2 from FIG. 5 and FIG. 6. In particular the groove 19 in the second front surface 18 can readily be seen here. The width of the groove 19 has approximately the same width as the second front surface 18. The width of the groove 19 or of the second front surface 18 should be understood here as meaning in each case the extent in the radial direction of the head region 6 of the main body 2 or else the distance between the middle wall 12 and the outer wall 14 in the radial direction. In the circumferential direction, the groove 19 extends over approximately 50% of the circumference of the second front surface 18, i.e. here over approximately 180%. In the present main body, the inner wall 10, the middle wall 12 and the outer wall 14 are each of circular configuration and are arranged concentrically with respect to one another and coaxially with respect to the axis Z from the previous drawings. The axis Z runs through the axis of rotation of the walls, and the walls run parallel to the axis Z.
[0092] The inner wall 10 here has an internal thread 70 into which a nozzle, not shown in FIG. 7, in particular a nozzle according to the disclosure or a nozzle produced according to a method of the disclosure, wherein said nozzles may comprise a material nozzle, which is frequently also called paint nozzle, can be screwed. The outer wall 14 here has an external thread 72 via which an air nozzle ring, not shown in FIG. 7, can be screwed with an air cap onto the head region 6 of the main body 2. By means of the internal thread 70 and/or the external thread 72, a nozzle set according to the disclosure or at least part thereof can be arranged on the main body. The middle wall 12 here does not have a thread. However, it is conceivable for the middle wall 12 to also be able to have an internal or external thread. Furthermore, it is conceivable that the outer wall 14 has an internal thread for the screwing-in of a component, in particular an air cap, and the inner wall 10 has an external thread for the screwing-on of a component, in particular a nozzle.
[0093] The first front surface 16 here has two radially inner air outlet openings 20a and 20b, the second front surface 18 here has two radially outer air outlet openings 22a and 22b. The diameter of the air outlet openings 20a, 20b, 22a and 22b corresponds virtually to the width of the front surfaces 16, 18 or of the groove 19 into which they are introduced. The available space can therefore be used for a maximum throughput of air.
[0094] FIG. 8 shows a perspective view of an exemplary embodiment of a nozzle 24 according to the disclosure. The nozzle 24 can have at least one material nozzle 40 with a material outlet opening 28 and a portion for the fitting of a tool, in the present case a hexagonal stub 41, and a disk element 32 with a front surface 34 and a conical surface 35. The front surface 34 here has a plurality of passage openings 36, preferably seven to nine, distributed over the circumference. The material nozzle 40 and the disk element 32 are preferably configured integrally. Arranged thereon, preferably arranged captively, particularly preferably pressed thereon, is a first baffle disk 30 which has a larger outer circumference than the disk element 32. Arranged in turn on said first baffle disk 30, preferably integrally arranged, is a second baffle disk 42 which can be seen in FIG. 9 and has a smaller outer circumference than the first baffle disk. The second baffle disk is arranged on that side of the first baffle disk 30 which faces away from the material outlet opening 28. Like the first baffle disk 30, the second baffle disk 42 is also configured annularly with an inner and an outer circumference. The inner circumference of the second baffle disk 42 does not extend in the radial direction as far as the external thread 46 of the material nozzle 40, and therefore there is a gap between the inner circumference of the second baffle disk 42 and the external thread 46 of the material nozzle 40. The second baffle disk 42 is spaced apart from the passage openings 36 in the axial direction, i.e. in the direction of the central or longitudinal axis of the nozzle 24.
[0095] In the radial direction, the second baffle disk 42 virtually completely projects over or overlaps the passage openings 36, as can readily be seen in FIG. 10. In addition, the material outlet opening 28 and the baffle surface 30a of the first baffle disk 30 can be seen in FIG. 10. In the present exemplary embodiment, the first baffle disk 30 and the disk element 32 each have a circular outer circumference and are arranged concentrically with respect to each other. On its side facing away from the material outlet opening 28, the disk element 32 preferably has a recess or a groove in which the passage openings 36 are arranged. This increases the distance between that side of the disk element 32 which faces away from the material outlet opening 28 and that side of the second baffle disk 42 which faces said side, and the air which flows into said region has more volume available in order to be distributed.
[0096] FIG. 11 shows the design of the exemplary embodiment of a nozzle 24 according to the disclosure in a sectional view. It can be seen that the material nozzle 40 with its material outlet opening 28 and the disk element 32 are configured integrally. On a surface 32a facing away from the material outlet opening 28, the disk element 32 has an encircling groove 33 which permits or facilitates the pressing of the first baffle disk 30 onto the disk element 32. The first baffle disk 30 has an inner circumference and an outer circumference, wherein the outer circumference of the first baffle disk 30 is larger than the outer circumference of the disk element 32. The inner circumference of the first baffle disk 30 extends approximately as far as the passage openings 36 of the disk element 32. The second baffle disk 42 is arranged integrally on the first baffle disk 30.
[0097] An inner collar 43 can be arranged inbetween. The first baffle disk 30, the second baffle disk 42 and optionally the inner collar 43 here form a Z shape. On its side facing the material outlet opening 28, in particular in the region of the inner circumference, the first baffle disk 30 can have a cutout such that a step shape is formed which can form the contact region between the first baffle disk 30 and the disk element 32. On its side facing away from the material outlet opening 28, in particular in the region of the outer circumference, the disk element 32 here likewise has a step which forms the contact region between the first baffle disk 30 and the disk element 32. The disk element 32 and the first baffle disk 30 are connected to each other directly, in particular without a sealing element arranged inbetween, and the connection between the disk element 32 and the first baffle disk 30 is configured to be substantially air-impermeable. In the region between its inner circumference and its outer circumference, the first baffle disk 30 is configured from continuous material; in particular, it does not have any passage openings. In the present exemplary embodiment, the disk element has three contact surfaces which are formed by a first surface 32a of the disk element 32, said surface facing away from the material outlet opening 28, a second surface 32b of the disk element 32, said surface facing away from the material outlet opening 28, and a third surface 32c of the disk element 32, said surface being arranged between the first surface 32a and the second surface 32b. The first baffle disk 30 likewise has three contact surfaces which are formed by the mating surfaces of the first baffle disk 30, said mating surfaces each bearing against the contact surfaces of the disk element 32. The contact surfaces are arranged substantially at right angles to one another. The various contact surfaces can be differentiated from one another by being arranged at an angle unequal to 180 with respect to one another or being separated from one another by grooves. Due to manufacturing tolerances, it is difficult for both the first surface 32a and the second surface 32b to be in contact with the respective mating surface of the first baffle disk 30. A gap caused by the manufacturing technique between the first surface 32a and/or second surface 32b and the respective mating surface of the first baffle disk 30 is not intended to be taken into consideration and is intended also to be considered to be a contact surface. In particular the third surface 32c of the disk element 32 and/or the mating surface of the first baffle disk 30 can be of slightly conical configuration and/or can have a phase in order to facilitate the attaching, in particular pressing of the first baffle disk onto the disk element.
[0098] A surface 30a of the first baffle disk 30, said surface facing away from the material outlet opening 28, is set back along an axis Z in relation to that surface 32b of the disk element 32 which faces away from the material outlet opening 28, i.e. the surface 32b of the disk element 32 is closer in the axial direction to the material outlet opening 28 than the surface 30a of the first baffle disk 30.
[0099] The nozzle 24 is equipped here with an air-directing disk 38 which can likewise be connected captively to the nozzle 24, in particular the material nozzle 40, in particular can be pressed thereon, and can be arranged downstream of the at least one passage opening 36 of the disk element 32 in the direction of the nozzle longitudinal axis. In addition, the present nozzle 24 has a sealing element 44, the purpose of which will be explained further below. The sealing element 44 which is frequently also referred to as the nozzle or paint nozzle seal, is preferably composed of plastic and is preferably connected interchangeably to the material nozzle 40. Furthermore, the external thread 46 of the material nozzle 40 is indicated in FIG. 11.
[0100] FIG. 12 shows a sectional view of the head region 6 of an exemplary embodiment of a spray gun according to the disclosure or a main body equipped with the exemplary embodiment of a nozzle 24 according to the disclosure from FIG. 8 to FIG. 11 or a main body equipped with an exemplary embodiment of a nozzle set according to the disclosure, which comprises the exemplary embodiment of a nozzle 24 according to the disclosure from FIG. 8 to FIG. 11, in the assembled state. The nozzle 24 which is present here as a unit consisting of a material nozzle 40 with a disk element 32, a first baffle disk 30, a second baffle disk 42, an air-directing disk 38 and a sealing element 44, is screwed via the above-described thread into the main body or into the head region thereof. The stop is formed here by the first baffle disk 30, in particular the baffle surface 30a thereof, and the middle wall 12 of the head region 6 of the main body. The baffle surface 30a of the first baffle disk 30 acts here as a sealing surface, and the middle wall 12, in particular the front end of the middle wall 12, acts as a mating sealing surface against which the baffle surface 30a lies in a sealing manner. Alternatively or additionally, the outer surface of the second baffle disk 42 or the outer surface of the inner collar 43 between the first baffle disk 30 and the second baffle disk 42 can also lie in a sealing manner against an inner surface of the middle wall 12.
[0101] When the nozzle 24 is screwed in, the sealing element 44 is pressed against a mating sealing surface 84, which is shown in FIG. 6, and seals the material-guiding region of the spray gun, in particular the transition region between the paint duct in the main body and hollow portion of the material nozzle 40 for the passage of the material to be sprayed, in relation to the air-guiding region of the spray gun.
[0102] In the installed state, the first baffle disk 30 together with the outer wall 14 forms a gap 86 which is preferably an annular gap having a substantially constant width. The second baffle disk 42 together with the inner wall 10 forms a further gap 88 which is likewise preferably an annular gap having a substantially constant width. The inner collar 43 is arranged in the radial direction directly next to the middle wall 12 of the main body 2, in particular directly next to an inner surface of the middle wall 12 of the main body 2.
[0103] The air nozzle ring 74 can be arranged on the head region 6 of the main body via the thread already mentioned above. The air cap 78 is arranged in the air nozzle ring 74, wherein the air cap 78 is fixed in a first direction by means of a flange 90 which lies against a projection on the inner surface of the air nozzle ring 74. In the opposite direction, the air cap 78 is bounded by a securing ring 89 which lies in a groove 91 in the air cap 78 and in a cutout in the inner surface of the air nozzle ring 74. Merely for better visibility, the securing ring 89 in FIG. 12 here is illustrated outside the groove 91, with the securing ring 89 also not having to be completely located in the groove 91. For example, the securing ring 89 can be of polygonal configuration, and therefore it lies only in regions in the circular groove 91.
[0104] As can be seen in FIG. 7, in the present exemplary embodiment of the main body according to the disclosure, the first front surface 16 between the inner wall 10 and the middle wall 12 and the second front surface 18 between the middle wall 12 and the outer wall 14 in each case have two air outlet openings 20a and 20b, and 22a and 22b, respectively. Again with reference to FIG. 12, it is apparent that the air flowing out of the two radially inner air outlet openings 20a and 20b between the inner wall 10 and middle wall 12 first of all impinges on the second baffle disk 42 which is arranged downstream of the radially inner air outlet openings 20a, 20b in the main body 2 in the direction of the nozzle longitudinal axis and is spaced apart in the axial direction from the radially inner air outlet openings 20a, 20b and at least partially, preferably completely or virtually completely, projects over the air outlet openings 20a, 20b in the radial direction. On account of the constriction in the form of the gap 88, the air is distributed over the circumference of the air-distributor chamber between the inner wall 10 and the middle wall 12. The air flows through the gap 88 and is thereby restricted before the air flows through the passage openings 36 of the disk element 32. The air emerging to a certain extent in a punctiform manner from the passage opening 36 impinges on the air-guiding element 38, as a result of which the air is distributed more extensively, is homogenized and is slightly restricted again by the slight narrowing between the air-directing element 38 and the inner surface of the air cap 78. From the air-cap chamber 80 between the air cap 78 and the material nozzle 40, the air then flows through a gap, in particular annular gap, which arises by the fact that the front end of the material nozzle 40 projects from the inner side into the central opening 79 in the air cap 78. The material to be sprayed which flows out of a material supply device through the paint duct in the main body of the spray gun and the hollow portion of the material nozzle 40 is atomized by the air flowing out of the gap, as a result of which what is referred to as the spray jet is formed. The air with the profile just described is therefore referred to as atomizer air. The two radially inner air outlet openings 20a and 20b between the inner wall 10 and the middle wall 12 may be referred to as atomizer-air outlet openings, the air ducts located therebehind as atomizer-air ducts, and the air-distributor chamber, which can be bounded by the inner wall 10 and the middle wall 12, as atomizer-air distributor chamber. The region through which the atomizer air flows may be referred as the atomizer-air region.
[0105] The abovementioned internal nozzle pressure is the pressure prevailing in the air cap-chamber 80.
[0106] The air flowing out of the two radially outer air outlet openings 22a and 22b, which although present in the main body shown in FIG. 12, can be particularly readily seen in FIG. 7, first of all impinges on the first baffle disk 30 which is arranged downstream of the radially outer air outlet openings 22a, 22b in the main body 2 in the direction of the nozzle longitudinal axis and is spaced apart in the axial direction from the radially outer air outlet openings 22a, 22b and projects at least partially, preferably completely or virtually completely, over the radially outer air outlet opening 22a, 22b in the radial direction. Due to the constriction in the form of the gap 86, the air is distributed over the circumference of the air-distributor chamber between the middle wall 12 and the outer wall 14. The air flows through the gap 86 and is thereby restricted. The air advantageously subsequently flows into an intermediate chamber 92 and into the horn-air supply ducts 78a in the horns of the air cap 78. From here, the air flows out of the horn-air bores 78b and impinges on the abovementioned spray jet and deforms the latter. In particular, what is referred to as horn air flowing out of the horn-air bores 78b in the diametrically opposite horns of the air cap 78 compresses the spray jet, which originally has circular cross section, on two opposite sides, thus resulting in what is referred to as a wide jet. The quantity of horn air flowing out of the horn-air bores 78b or even the quantity of air flowing out of the radially outer air outlet openings 22a and 22b, which may be referred to as horn-air outlet openings, can be adjusted via a fan control 9, which is shown by way of example in FIG. 4. If the horn air is reduced to zero or virtually zero, the spray gun produces what is referred to as a circular jet with a circular cross section. The air ducts behind what are referred to as the horn-air outlet openings can be referred to as horn-air ducts, the air-distributor chamber which is bounded by the middle wall 12 and the outer wall 14 may be referred to as the horn-air distributor chamber and the region through which the horn air flows may be referred to as the horn-air region. For sealing the horn-air region in relation to the environment, a sealing element 87 can be provided between the air nozzle ring 74 and the head region 6.
[0107] What are referred to as control openings 79a can be introduced into the front surface of the air cap 78, radially outside the central opening 79. The air emerging from the control openings 79a influences the horn air, in particular weakens the impact of the horn air on the spray jet. Furthermore, what is referred to as the control air projects the air cap 78 against soiling by carrying paint droplets away from the air cap 78. In addition, it contributes to the further atomization of the spray jet. The control air also acts on the round jet and brings about a slight preliminary deformation and also here additional atomization.
[0108] As can readily be seen in FIG. 12, the separation, in particular the sealing, between the atomizer-air region and the horn-air region takes place by means of the middle wall 12, the first baffle disk 30, the disk element 32 and by means of the air cap 78, in particular by means of a preferably encircling web 78c of the air cap 78. Similarly, the separation of the above-described first air flow path 150 and the above-described second air flow path 155 takes place. The web 78c here has a conical region which lies against the conical surface 35 of the disk element 32. As a result, centring of the air cap 78 also takes place, and it is thereby ensured that the air cap 78 and the material nozzle 40 are arranged concentrically with respect to each other, and the abovementioned gap, in particular annular gap, between the front end of the material nozzle 40 and the air cap 78 has a constant width for letting out the atomizer air.
[0109] It is clear that, on account of the particular configuration of the nozzle according to the disclosure and the spray gun according to the disclosure, no additional sealing element for sealing between the atomizer-air region and horn-air region is necessary.
[0110] The exemplary embodiment, shown in FIGS. 8 to 12, of a nozzle 24 according to the disclosure is preferably a low-pressure nozzle or HVLP nozzle or a nozzle for use in a low-pressure or HVLP nozzle set or a nozzle for use in a low-pressure or HVLP spray gun.
[0111] FIG. 13 shows a perspective view of a second exemplary embodiment of a nozzle 50 according to the disclosure. In comparison with the first exemplary embodiment shown in FIGS. 8 to 12, the present nozzle 50 does not have an air-directing disk, and the disk element 32 has a greater number of passage openings 36 in the front surface 34, for example eleven to thirteen. Otherwise, the nozzle 50 also has a material nozzle 40 with a material outlet opening 28, and the disk element 32 has a conical surface 35. On its side facing away from the material outlet opening 28, the disk element 32 preferably has a recess or a groove in which the passage openings 36 are arranged. In the installed state of the nozzle 50, this increases the distance between that side of the disk element 32 which faces away from the material outlet opening 28 and the first front surface 16 of the head region 6 of the main body 2, and the air which flows into said region has more volume available in order to be distributed.
[0112] It can be seen for the first time in FIG. 14 that the first baffle disk 31 of the nozzle 50 is configured differently from the first baffle disk 30 of the previously described nozzle 24. The nozzle 50 does not have a second baffle disk and instead has an inner collar 52 and an outer collar 53 with a baffle surface 31a lying inbetween. The outer collar 53 is arranged on the outer circumference of the first baffle disk 31, and the inner collar 52 is arranged on the inner circumference of the first baffle disk 31. The outer collar 53 has an oblique surface 53a.
[0113] It becomes clear in FIG. 15, which shows a view from the rear of the nozzle 50, that the passage openings 36 are completely exposed, i.e. are not concealed or projected over by other components of the nozzle 50. The disk element 32 of the nozzle 50 preferably has a greater number of passage openings 36, in particular between 10 and 14.
[0114] The exposed passage openings 36 are also apparent in FIG. 16 which is a section view of the nozzle 50. The material nozzle 40 with the disk element 32 arranged integrally and the sealing element 44 preferably arranged interchangeably is substantially identical to the material nozzle 40 with the disk element 32 arranged integrally and the sealing element 44, which is preferably arranged interchangeably, of the above-described nozzle 24. The statements above with regard to these components apply correspondingly to the nozzle 50. The first baffle disk 31 with the inner collar 52, outer collar 53 and baffle surface 31a lying therebetween differs from the first baffle disk 30 of the previously described nozzle 24.
[0115] FIG. 17 shows a section view of the head region 6 of an exemplary embodiment of a spray gun according to the disclosure or a main body equipped with the exemplary embodiment of a nozzle 50 according to the disclosure from FIG. 13 to FIG. 16 or a main body equipped with an exemplary embodiment of a nozzle set according to the disclosure, which comprises the exemplary embodiment of a nozzle 24 according to the disclosure from FIG. 13 to FIG. 16, in the assembled state. The main body is the exemplary embodiment shown in FIG. 12. In particular, the head region 6 is configured identically, and therefore reference can be made to the above statements with regard thereto. It can be seen that the gap 86 between the outer wall 14 and the first baffle disk 31 or outer collar 53 of the first baffle disk 31 is narrower than the gap 86 from FIG. 12, which shows the head region 6 of the main body, said head region being equipped with the previously described nozzle 24. Since the same main body having the same dimensions, in particular having the same inner diameter of the outer wall 14, is involved, it becomes clear that the first baffle disk 31 of the nozzle 50 has a larger outer diameter than the the first baffle disk 30 of the nozzle 24. The inner collar 52 is arranged in the radial direction directly next to the middle wall 12 of the main body 2, in particular directly next to an inner surface of the middle wall 12 of the main body 2. The remaining statements with regard to the arrangement shown in FIG. 12 can also apply to the arrangement shown in FIG. 17.
[0116] The lack of a second baffle disk and lack of an air-directing disk in the nozzle 50 in comparison to the nozzle 24 means that the atomizer air in the arrangement shown in FIG. 17, i.e. when the nozzle 50 is used, is restricted to a lesser extent than in the arrangement shown in FIG. 12, i.e. when the nozzle 24 is used. As a result, the internal nozzle pressure, i.e. in particular the pressure in the air-cap chamber 81 between the air cap 78 and the material nozzle 40, when the nozzle 50 is used, is greater than the internal nozzle pressure, i.e. in particular the pressure in the air-cap chamber 80, shown in FIG. 12, between the air cap 78 and the material nozzle 40 when the nozzle 24 is used.
[0117] The nozzle 50 shown in FIGS. 13 to 17 is preferably a low-pressure or HVLP nozzle or a nozzle for use in a low-pressure or HVLP nozzle set, or a nozzle for use in a low-pressure or HVLP spray gun.
[0118] It should finally be emphasized that the exemplary embodiments described describe only a limited selection of embodiment possibilities and therefore do not constitute any restriction of the present disclosure.
