Paint gun

Abstract

The invention relates to a paint gun (100), comprising: a paint gun body (10) having a first paint interface (11) and a first compressed air interface (12); a paint nozzle (20) with a second paint interface (21) corresponding to the first paint interface (11) and a paint outlet opening (22), wherein between the second paint interface (21) and outlet opening (22) a flow channel (23) for a paint flow in a paint flow direction (Z) is arranged; an air cap (30) having a second compressed air interface (31); wherein the first compressed air interface (12) is fluidically connected to the second compressed air interface (31); wherein the air cap (30) engages about the paint nozzle (20) in such a manner that an annular channel (40) is produced between the outer contour (24) of the paint nozzle (20) and the air cap (30) for a carrier air flow with a compressed-air annular outlet opening (45); wherein the annular channel (40) has at least one first annular channel portion (41) with a carrier air flow direction (X), wherein an angle (X-Z) between the carrier air flow direction (X) and the paint flow direction (Z) is greater than 90° and less than or equal to 245°, such that the carrier air flow flows in the axial direction opposite the paint flow.

Description

[0001] paint spray gun

[0002] The invention relates to paint spray guns, a use of a paint nozzle with an air cap in such paint spray guns, and a nozzle arrangement for a paint spray gun, each with a uniformly distributed air flow and spray jet.

[0003] Paint spray guns are generally known in the art and are used, for example, in automotive workshops for painting cars. Paint spray guns are used to atomize flowable material and apply it to a surface. The material to be applied can be either liquid or powder. The paint spray gun has a paint nozzle from which a spray jet emerges. The spray jet is formed by a paint flow and an air flow. The air flow causes the paint to emerge from the paint nozzle through the Bernoulli effect; in particular, the paint is sucked out of the paint nozzle by the air flow. This places high demands on the spray jet. These, in turn, can only be achieved through a uniform flow of air, also known as a carrier air flow.

[0004] In this context, it has now become apparent that there is a further need to provide paint spray guns and a nozzle arrangement for a paint spray gun, each with a uniform distribution of the air flow, in particular there is a need to provide paint spray guns and a nozzle arrangement for a paint spray gun, each with a uniformly distributed air flow and spray jet.

[0005] These and other objects, which will be mentioned upon reading the following description or which may be recognized by a person skilled in the art, are achieved by the subject matter of the independent claims. The dependent claims further develop the central idea of ​​the present invention.

[0006] According to a first aspect, a paint spray gun is provided which comprises the following: a paint spray gun body with a first paint interface and a first compressed air interface, a paint nozzle or paint nozzle arrangement with a second paint interface corresponding to the first paint interface and a paint outlet opening, wherein a flow channel for a paint flow in a paint flow direction (Z) is arranged between the second paint interface and the outlet opening, and an air cap with a second compressed air interface, wherein the first compressed air interface is fluidically connected to the second compressed air interface; wherein the air cap engages around the paint nozzle or paint nozzle arrangement in such a way that a pressure difference is formed between an outer contour of the paint nozzle orPaint nozzle arrangement and the air cap, in particular an inner contour of the air cap, an annular channel for a carrier air flow with a compressed air ring outlet opening is created, wherein the annular channel has at least a first annular channel section with a carrier air flow direction (X), wherein an angle (XZ) between the carrier air flow direction (X) and the paint flow direction (Z) is greater than 90° and less than or equal to 245°, so that the carrier air flow in the first annular channel section flows in an axial direction opposite to the paint flow.

[0007] According to a further aspect, a paint spray gun is provided which comprises a paint spray gun body with a first compressed air interface, a paint nozzle with a paint outlet opening and an air cap with a second compressed air interface, wherein the first compressed air interface is fluidically connected to the second compressed air interface, wherein the air cap surrounds the paint nozzle in such a way that an annular channel for a carrying air flow with a compressed air ring outlet opening is created between an outer contour of the paint nozzle and the air cap, in particular an inner contour of the air cap, wherein the annular channel has at least one annular channel inlet section with a carrying air inlet flow direction (W) and a first annular channel section with a carrying air flow direction (X),wherein an angle (WX) between the supporting air inlet flow direction (W) and the supporting air flow direction (X) in the first annular channel section is greater than 90° and less than or equal to 245°, so that the supporting air flow in the first annular channel section flows in an axial direction opposite to the supporting air flow in the annular channel inlet section.

[0008] According to a further aspect, a nozzle arrangement for a paint spray gun is provided, which comprises at least the following: an air cap and a paint nozzle, wherein the air cap engages around the paint nozzle such that an annular channel is formed between an outer contour of the paint nozzle and the air cap, in particular an inner contour of the air cap, wherein the annular channel has at least one annular channel inlet section which extends along a first extension direction (E1), wherein the annular channel has a first annular channel section which extends along a second extension direction (E2), wherein an angle (E1-E2) between the first extension direction (E1) and the second extension direction (E2) is greater than 90° and less than or equal to 245°, so that the second extension direction (E2) is opposite to the first extension direction (E1) in the axial direction.

[0009] The following statements can apply to each of the paint spray guns according to the invention and to the nozzle arrangement according to the invention. The above-mentioned second paint spray gun according to the invention can have the same features as the above-mentioned first paint spray gun according to the invention. The above-mentioned first paint spray gun according to the invention can have the same features as the above-mentioned second paint spray gun according to the invention. The above-mentioned second paint spray gun according to the invention can have the same additional components as the above-mentioned first paint spray gun according to the invention. The above-mentioned first paint spray gun according to the invention can have the same additional components as the above-mentioned second paint spray gun according to the invention. The nozzle arrangement according to the invention can have the same features as the paint guns according to the invention.The nozzle assembly according to the invention can be used together with the same components as the paint spray guns according to the invention. The nozzle assembly according to the invention can be used together with the paint spray guns according to the invention.

[0010] The term "paint spray gun" refers in particular to a hand-held paint application unit with a trigger handle for actuating a valve designed to release a paint flow and / or for actuating a valve designed to release a compressed air flow. The terms "paint interface", "paint nozzle" or other designations containing the terms "paint" or "color" are not to be understood as restricting these materials. The paint spray gun according to the invention can be used to spray, for example, paint, adhesive or varnish, in particular base and clear coat, both solvent-based and water-based, as well as liquids for the food industry, wood preservatives or other liquids. The said paint spray gun can be a hand-held paint gun, but also an automatic or robotic gun.Hand-held spray guns are primarily used by tradespeople, especially painters, carpenters, and varnishers. Automatic and robotic spray guns are generally used in conjunction with a painting robot or a painting machine for industrial applications. However, it is certainly conceivable to integrate a hand-held spray gun into a painting robot or a painting machine. In particular, a spray gun according to the invention designed as a hand-held spray gun can be designed as a gravity-feed gun with a paint cup arranged above the spray gun body, from which the material to be sprayed flows into and through the paint channels essentially by gravity and by vacuum at the front end of the paint nozzle.The paint spray gun according to the invention can be a side-feed cup gun, in which the paint cup is arranged laterally on the paint gun body, and in which the material is fed by gravity and by vacuum at the front end of the material nozzle of the gun. The paint spray gun according to the invention can be designed as a suction or suspended cup gun with a paint cup arranged below the paint gun body, from which the material to be sprayed is sucked out of the cup essentially by vacuum. The paint spray gun according to the invention can be designed as a pressure cup gun, in which the cup is arranged below, above, or to the side of the paint gun body and is pressurized, whereupon the material to be sprayed is forced out of the cup.The paint spray gun according to the invention can be a pressure-feed gun, in which the material to be sprayed is fed to the spray gun via a hose from a paint container or via a pump. The paint spray gun according to the invention can be a low-pressure gun, in particular an HVLP gun, with an internal nozzle pressure of a maximum of 10 psi or 0.7 bar, whereby transfer rates of more than 65% are achieved. However, it can also be a compliant gun, which has an internal nozzle pressure of more than 10 psi or 0.7 bar, but also achieves a transfer rate of more than 65%. However, it can also be a different type of paint gun. The nozzle arrangement according to the invention can be used in all of the aforementioned types of paint guns.

[0011] The term "spray gun body" refers in particular to a housing designed to arrange the components of a spray gun relative to one another and to at least partially enclose them. The spray gun body in particular has a handle. The spray gun can have a compressed air connection, a paint needle, a trigger for opening an air valve and for moving the paint needle out of the outlet opening of the paint nozzle, a round-to-wide jet regulator for adjusting the ratio of atomizing air and horn air to shape the paint jet, an air micrometer for adjusting the spray pressure, a material flow regulator for adjusting the maximum material flow rate, a material connection, paint channels for directing the material to be sprayed from a material inlet to the material outlet opening, a suspension hook, and / or an analog or digital pressure measuring device.However, it can also comprise further components from the prior art. In particular, a compressed air interface and a paint connection can be arranged in or on the paint spray gun body. Furthermore, a paint nozzle body is arranged on the paint spray gun body. The paint spray gun body has, in particular, an interface for the paint nozzle body, and the paint nozzle body has a corresponding interface. The interfaces can, in particular, be designed as threads. The paint spray gun body can be made of plastic or metal. The paint spray gun body can comprise a paint interface and at least one compressed air interface, in particular two compressed air interfaces, which are designed to be fluidically connected to corresponding interfaces of the paint nozzle and / or the air cap.

[0012] The term “compressed air interface” refers in particular to an interface via which compressed air can be transported from one structural unit to another structural unit. The compressed air interface can comprise a sealing ring and / or a mechanical coupling element. The compressed air interface connects in particular two flow channels for transporting compressed air from one flow channel to the second flow channel. The compressed air interface corresponds in particular to a further compressed air interface in another structural component. Two compressed air interfaces, for example one in the paint spray gun body and one in the air cap, can also be fluidically connected indirectly via a channel. The compressed air interface can also be formed, for example, by two structural elements. The compressed air interface can, for example, be formed in the annular channel by the paint nozzle and the air cap.The compressed air interface may comprise an air distribution ring and / or a separation ring and / or an air distribution ring and / or a separation ring may comprise one or more compressed air interfaces.

[0013] The term "paint interface" refers specifically to an interface through which a paint flow can be transported from the paint gun body to the paint nozzle. The paint interface may comprise a sealing ring and / or a mechanical coupling element.

[0014] The term "air cap" refers in particular to a structural component that is designed to be positioned on or above the paint nozzle and to be further supplied with compressed air. The air cap is particularly designed to guide a carrier air flow in such a way that it conveys, or in particular sucks, the paint or paint flow out of the outlet opening of the paint nozzle through negative pressure, in particular the Bernoulli effect. The air cap is attached to the spray gun body, for example, with a union nut, in particular an air nozzle ring.

[0015] The term "annular channel" in this context refers to an annular gap formed by the outer contour of the paint nozzle and the inner contour of the air cap. In the annular channel, the supporting air flows from an inlet interface, the so-called second compressed air interface, to an outlet interface, the so-called compressed air ring outlet opening. The annular channel can have several flow channel sections. The flow channel sections can differ in their width, cross-sectional area, and / or direction, particularly their extension direction.

[0016] The term “carrying air flow” refers in particular to a compressed air flow that is designed to convey, in particular suck, paint out of the outlet opening of the paint nozzle by means of negative pressure, in particular the Bernoulli effect. The term “carrying air flow” can in particular refer to a compressed air flow that is designed to convey, in particular suck, paint out of the outlet opening of the paint nozzle by means of negative pressure, in particular the Bernoulli effect, and then to atomise the paint. The carrying air flow can be the atomising air that atomises the material emerging from the paint nozzle. The carrying air flow can also be control and / or transport air that emerges from control bores in the air cap. This control and / or transport air can be designed in such a way that it influences the horn air or shaping air, in particular to weaken the impact of the horn air on the spray jet.The control and / or transport air can additionally or alternatively be configured to carry paint droplets away from the air cap, thus protecting the air cap from contamination. The control and / or transport air can additionally or alternatively be configured to contribute to the further atomization of the spray jet. The control and / or transport air can additionally or alternatively be configured to contribute to the transport of the spray jet toward the object to be coated.

[0017] The carrying air flow flows, for example, from an air outlet in the paint spray gun body, in particular in the head of the paint spray gun body, which can represent and / or have a first compressed air interface, optionally through an air distribution ring and / or a separating ring and / or another component, to the second compressed air interface, in particular an air inlet of the air cap, and into an annular channel inlet section. The flow direction of the air in the annular channel inlet section can preferably be the same as the paint flow direction (Z) in the paint nozzle. The flow direction of the air in the annular channel inlet section can be different from the paint flow direction (Z) in the paint nozzle. The flow direction of the air in the annular channel inlet section can preferably be the carrying air inlet flow direction (W). The flow direction of the air in the annular channel inlet section can preferably be the same as the spraying direction of the paint gun.The flow direction of the air in the annular channel inlet section can be different from the spray direction of the paint spray gun. The flow direction of the air in the annular channel inlet section can preferably be the same as the first extension direction (E1) of the annular channel inlet section. The first extension direction (E1) of the annular channel inlet section can preferably be the same as the paint flow direction (Z) in the paint nozzle. The first extension direction (E1) of the annular channel inlet section can be different from the paint flow direction (Z) in the paint nozzle. The first extension direction (E1) of the annular channel inlet section can preferably be the same as the spray direction of the paint spray gun. The first extension direction (E1) of the annular channel inlet section can be different from the spray direction of the paint spray gun. The air is deflected on a front inner surface of the air cap, e.g.by 90° to the direction of air flow in the annular duct inlet section, before it is deflected again, preferably again by 90°. The direction of air flow (X) in this first annular duct section is thus now opposite, in particular 180°, to the paint flow direction (Z) in the paint nozzle. The direction of air flow can now be opposite, in particular 180°, to the flow direction in the annular duct inlet section. The direction of air flow can now preferably be opposite, in particular 180°, to the direction of air inlet flow (W). The direction of air flow can now be opposite, in particular 180°, to the spraying direction of the paint gun. In the present application, a deflection can always be arc-shaped. Instead of a deflection by two times 90°, the deflection can, for example, be arc-shaped by 180°, in particular U-shaped. Deflections by other angles mentioned here can also be arc-shaped.For all deflections mentioned in the present application, the deflection can be curved.

[0018] In the paint spray guns according to the invention and / or in the nozzle arrangement according to the invention, the first annular channel section is preferably arranged closer in the radial direction to a paint outlet opening of the paint nozzle than the annular channel inlet section.

[0019] The formulation that the supporting air flow in the first annular channel section flows in an axial direction opposite to the paint flow means that the supporting air flow has a first flow direction component that is opposite to the paint flow direction (Z). The supporting air flow can also have a second flow direction component that is orthogonal to the first flow direction component and orthogonal to the paint flow direction (Z). The second flow direction component can be zero, in which case an angle (XZ) between the supporting air flow direction (X) and the paint flow direction (Z) is 180°.

[0020] The formulation that the supporting air flow in the first annular channel section flows in an axial direction opposite to the supporting air flow in the annular channel inlet section is to be understood as meaning that the supporting air flow in the first annular channel section has a first flow direction component which is opposite to the supporting air flow in the annular channel inlet section, i.e. the supporting air inlet flow direction (W). The supporting air flow can also have a second flow direction component which is orthogonal to the first flow direction component and which is orthogonal to the supporting air flow in the annular channel inlet section, i.e. to the supporting air inlet flow direction (W). The second flow direction component can be zero, in which case an angle (WX) between the supporting air inlet flow direction (W) and the supporting air flow direction (X) in the first annular channel section is 180°.The formulation that the second extension direction (E2) of the first annular channel section is axially opposite to the first extension direction (E1) of the annular channel inlet section is to be understood as meaning that the second extension direction (E2) has a first extension direction component that is opposite to the first extension direction (E1). The second extension direction (E2) can also have a second extension direction component that is orthogonal to the first extension direction component and orthogonal to the first extension direction (E1). The second extension direction component can be zero, in which case an angle (E1-E2) between the first extension direction (E1) and the second extension direction (E2) is 180°.

[0021] The invention is based on the knowledge that the carrier air flow must be precisely guided in order to achieve a uniform spray or spray pattern. The carrier air flow exits in a ring shape at the compressed air ring outlet opening. The outlet opening of the paint nozzle is located in the center of the compressed air ring outlet opening. For a uniform spray or spray pattern, the compressed air must be evenly distributed in the carrier air flow. This is determined, among other things, by the geometric dimensions of the compressed air ring outlet opening. Normally, very tight geometric tolerances must be maintained in order to match the paint nozzle and the air cap to one another so that the assembled annular gap or compressed air ring outlet opening is as geometrically accurate as possible. This is associated with correspondingly high costs. The invention solves this problem by increasing the back pressure within the annular channel.An increased back pressure within the annular channel compensates for geometric deviations of the annular channel and the annular channel outlet opening. An increased back pressure within the annular channel allows the air to be distributed more effectively over the circumference of the annular channel. The back pressure is increased according to the invention by increasing the length of the annular channel from the second compressed air interface to the compressed air ring outlet opening. The length of the annular channel is achieved by deflecting the supporting air flow direction (X) and in particular by reversing the supporting air flow direction (X) with respect to the paint flow direction (Z) or with respect to the supporting air inlet flow direction (W). Alternatively or additionally, the back pressure can be increased solely by deflecting the supporting air flow direction (X) and in particular by reversing the supporting air flow direction (X) with respect to the paint flow direction (Z) or with respect to the supporting air inlet flow direction (W).In addition, the back pressure can be increased by narrowing the annular channel in the direction of the annular channel outlet opening. In particular in the nozzle arrangement according to the invention, but also in the paint spray guns according to the invention, the back pressure within the annular channel is increased by increasing the length of the annular channel by changing the direction of extension of the annular channel. In particular, the first annular channel section has an opposite direction of extension to the annular channel inlet section. In the present application, the direction of extension is understood in particular to be the direction in which the air flows through the nozzle arrangement when using the nozzle arrangement or the paint spray gun on which the nozzle arrangement is arranged. In the present application, the direction of extension is understood in particular to be the direction of the path from an air inlet of the air cap to an air outlet of the air cap.In the present application, the direction of extension is understood to mean, in particular, the direction of the path from the annular channel inlet section to the annular channel outlet opening. In the nozzle arrangement according to the invention, the back pressure can be further increased by narrowing the annular channel toward the annular channel outlet opening.

[0022] The terms "annular gap outlet opening," "support air ring outlet opening," and "compressed air ring outlet opening" may be used synonymously in this application. The terms "air" and "compressed air" may be used synonymously in this application.

[0023] In the present application, the following applies: The statements regarding the supporting air flow direction (X) can also apply to the second extension direction (E2) and vice versa. The statements regarding the paint flow direction (Z) can also apply to the supporting air inlet flow direction (W) and vice versa. The statements regarding the paint flow direction (Z) can also apply to the first extension direction (E1) and vice versa. The statements regarding the supporting air inlet flow direction (W) can also apply to the first extension direction (E1) and vice versa. The statements regarding the angle (XZ) can also apply to the angle (WX) and vice versa. The statements regarding the angle (XZ) can also apply to the angle (E1-E2) and vice versa. The statements regarding the angle (WX) can also apply to the angle (E1-E2) and vice versa. The supporting air flow direction (X) can be the same as the second extension direction (E2) and vice versa.The paint flow direction (Z) can be the same as the air inlet flow direction (W) and vice versa. The paint flow direction (Z) can be the same as the first extension direction (E1) and vice versa. The air inlet flow direction (W) can be the same as the first extension direction (E1) and vice versa. The angle (XZ) can be the same as the angle (WX) and vice versa. The angle (XZ) can be the same as the angle (E1-E2) and vice versa. The angle (WX) can be the same as the angle (E1-E2) and vice versa.

[0024] In one embodiment, the angle (XZ) is greater than 90° and less than or equal to 180°, wherein the angle (XZ) is in particular greater than 135° and less than or equal to 180°. In this way, the supporting air flow is directed counter to the paint flow direction (Z). It flows obliquely counter to the paint flow direction (Z) in large sections. This causes an increase in back pressure and thus a more even distribution of the supporting air flow. For example, the angle is one of the following: 95°, 100°, 105°, 110°, 115°, 120°, 125°, 130°, 140°, 145°, 150°, 155°, 160°, 165°, 170°, 175°. As the angle (XZ) increases between 90° and 180° inclusive, the dynamic pressure increases more than at the lower angle value.

[0025] In one embodiment, the angle (XZ) is 180°.

[0026] In this way, the airflow is directed in the opposite direction to the paint flow (Z). This increases the dynamic pressure and thus distributes the airflow more evenly. It should be understood that a slight deviation from 180° is not harmful.

[0027] In one embodiment, a second annular channel section orthogonal thereto with an angle in the range of 80° to 100°, in particular 90°, is arranged behind the at least one first annular channel section, the angle of the first annular channel section being in particular 180°, and a third axial annular channel section with an angle in the range of -10° to 10°, in particular 0°, relative to the paint flow direction (Z) is arranged behind the second annular channel section. The arcuate deflection described above can of course also be used here. The second annular channel section does not have to be arranged orthogonally to the first annular channel section with an angle in the range of 80° to 100°, in particular 90°. In particular, the second annular channel section can be arcuate.

[0028] This creates a U-shaped flow path in the annular channel, which has a particularly strong effect on increasing back pressure.

[0029] In one embodiment, at least one of an outer diameter of the annular channel and an inner diameter of the annular channel decreases at least in sections over a length between the second compressed air interface and the compressed air ring outlet opening.

[0030] The cross-sectional area of ​​the annular circular area thus decreases. This leads to an acceleration of the flow and possibly to a further increase in dynamic pressure. The narrowest cross-section can be at the air ring outlet opening. The narrowest cross-section can be in front of, in particular directly in front of, the air ring outlet opening. In one embodiment, the air cap has a plurality of control bores distributed radially over a circumference, wherein the annular channel has at least one axial fourth annular channel section and wherein the plurality of control bores are arranged in the axial direction above the axial fourth annular channel section, such that at least part of the air flow flows into the plurality of control bores without deflection from the axial fourth annular channel section. The control bores can also be arranged differently, e.g. on two opposite sides of the annular gap outlet opening in the air cap.There may be one control bore, two control bores arranged in line with the center of the annular gap outlet or adjacent to each other, or three control bores arranged in line with the center of the annular gap outlet or adjacent to each other or in the shape of a triangle. All control bores can be arranged axially above the axial fourth annular channel section, so that at least part of the carrier air flow flows into the control bores without being deflected by the axial fourth annular channel section.

[0031] The term control bore here refers to a bore that is arranged at a radial distance around the circumference of the annular gap outlet opening in the air cap. The compressed air flow that exits through the control bore serves in particular to improve atomization of the spray jet, i.e. the paint that is conveyed by the carrier air flow. For example, the plurality comprises two, three, four or five bores. The control bore is fed by the carrier air flow in the annular channel flow. To ensure that a correspondingly high proportion of the carrier air flow passes through the control bores, the control bores are arranged above a fourth annular channel section arranged in the flow direction. The fourth annular channel section can coincide with the third annular channel section.

[0032] This ensures that sufficient compressed air flows through the control holes to ensure adequate atomization of the spray jet. Furthermore, the compressed air escaping from the control hole protects the air cap from paint contamination.

[0033] In one embodiment, the paint spray gun body comprises a fourth compressed air interface, wherein the air cap comprises a third compressed air interface for supplying jet-shaping compressed air, which is fluidly connected to the fourth compressed air interface, and wherein the air cap has at least two horns extending in the direction of the spray jet (paint-air jet), each with at least one, in particular at least two, in particular three, horn air bores directed towards the spray jet for forming a spray jet, wherein the horn air bores are connected to the third compressed air interface, such that a jet-shaping compressed air flow flows from the horn air bores. The horn air bores of a horn can be arranged on the same surface of the horn. The horn air bores of a horn can all be arranged on different surfaces of the horn, which can be arranged at an angle other than 180° to one another.Two or more horn air holes of a horn may be arranged on the same surface of the horn, while at least one further horn air hole is arranged on another surface of the horn, which may be arranged at an angle other than 180° to the first surface.

[0034] The term "horn" refers to a structural element designed to direct or channel compressed air to shape the spray jet. The horn has a compressed air interface that corresponds to a compressed air interface of the paint spray gun body and can be connected directly or indirectly. The compressed air cap has two horns, which are arranged opposite each other. The so-called jet-shaping compressed air exits through the horn air holes in the two horns. This compressed air can be used to adjust the shape of the spray jet. In particular, a round jet can be formed into a wide jet.

[0035] In this way, especially by choosing three horn air holes per horn, the shape of the spray jet is specially adapted.

[0036] In one embodiment, at least one of the horn air bores has a first jet shape flow direction (y1), wherein an angle (y1-Z) between the first jet shape flow direction (y1) and the paint flow direction (Z) is between 30° and 45°.

[0037] In this way, the compressed air stream from a horn air hole flows at an oblique angle onto the spray jet. This has a positive effect on the spray jet's shape.

[0038] In one embodiment, at least two of the horn air bores have a second jet shape flow direction (y2) and a third jet shape flow direction (y3), wherein an angle (y2-Z) between the second jet shape flow direction (y2) and the paint flow direction (Z) and an angle (y3-Z) between the second jet shape flow direction (y3) and the paint flow direction (Z) is between 60° and 85°.

[0039] In this way, the compressed air streams from the second and third horn air holes flow from an angle to a vertical direction onto the spray jet. These horn air holes, in particular the two upper holes, have a positive effect on the spray jet shape.

[0040] In one embodiment, the angle (y2-Z) between the second jet shape flow direction (y2) and the paint flow direction (Z) and the angle (y3-Z) between the second jet shape flow direction (y3) and the paint flow direction (Z) are different.

[0041] In this way, the shape of the spray jet can be optimally adjusted over the height.

[0042] In one embodiment, the spray gun comprises an air distribution ring for connecting the spray gun body to the paint nozzle.

[0043] The air distribution ring can function as an adapter. The air distribution ring can have compressed air interfaces configured to connect to the compressed air interfaces of the paint spray gun body. The air distribution ring can have compressed air interfaces configured to connect to the compressed air interfaces of the air cap. The air distribution ring can have one or more flow channels for transporting compressed air. The above can also apply to a separator ring.

[0044] In one embodiment, the air cap of the paint spray gun has an end wall, in particular a front end wall, in particular an end wall in which the compressed air ring outlet opening is arranged and / or formed.

[0045] In one embodiment, a collar extends from an inner side of the end wall of the air cap in an axial direction opposite to the paint flow direction. The collar may have one or more of the following features: the collar may be circumferential, in particular radially circumferential; the collar may be cylindrical, in particular axially cylindrical; the collar may be arranged concentrically with the compressed air ring outlet opening.

[0046] In one embodiment, a collar extends from a front inner surface of the air cap in an axial direction opposite to the paint flow direction. The collar may have one or more of the following features: the collar may be circumferential, in particular radially circumferential; the collar may be cylindrical, in particular axially cylindrical; the collar may be arranged concentrically to the compressed air ring outlet opening. In one embodiment, the lateral walls of the collar extend in a direction parallel to the paint flow direction.

[0047] In one embodiment, the paint nozzle has a sealing element at its end facing away from the outlet opening, wherein the sealing element is arranged at the same radial height as the collar of the air cap.

[0048] In one embodiment, the paint nozzle has an end face. The end face may have one or more of the following features: the end face may be a front end face; the end face may be tapered; the end face may face an inner side of an end wall of the air cap; the end face may face a front inner surface of the air cap.

[0049] In one embodiment, the end face of the paint nozzle has a groove. The groove can have one or more of the following features: the groove can be circumferential, in particular radial; the groove can be annular; the groove can be arranged concentrically to the paint outlet opening of the paint nozzle.

[0050] In one embodiment, the lateral walls of the groove extend in a direction parallel to the paint flow direction.

[0051] In one embodiment, the paint nozzle has a sealing element at its end facing away from the outlet opening, wherein the sealing element is arranged at the same radial height as the groove in the paint nozzle.

[0052] In one embodiment, a collar extending from an inner side of an end wall of the air cap and / or a front inner surface of the air cap and extending in an axial direction opposite to the paint flow direction engages in a groove in an end face of the paint nozzle in such a way that at least the first annular channel section is formed thereby.

[0053] In one embodiment of the second spray gun according to the invention, the angle (WX) is greater than 90° and less than or equal to 180°, wherein the angle (WX) is in particular greater than 135° and less than or equal to 180°.

[0054] In this way, the airflow is directed counter to the air inlet flow direction (W). For the most part, it flows diagonally opposite to the air inlet flow direction (W). This increases the dynamic pressure and thus distributes the airflow more evenly. For example, the angle is one of the following: 95°, 100°, 105°, 110°, 115°, 120°, 125°, 130°, 140°, 145°, 150°, 155°, 160°, 165°, 170°, 175°. As the angle (WX) increases between 90° and 180°, the dynamic pressure increases more than at the lower angle value.

[0055] In one embodiment, the angle (WX) is 180°.

[0056] In this way, the airflow is directed in the opposite direction to the air inlet flow direction (W). This increases the dynamic pressure and thus distributes the airflow more evenly. It should be understood that a slight deviation from 180° is not harmful.

[0057] In one embodiment, behind the at least one first annular channel section, the angle of the first annular channel section being in particular 180°, there is arranged a second annular channel section which is orthogonal thereto and has an angle in the range of 80° to 100°, in particular 90°, and behind the second annular channel section there is arranged a third axial annular channel section with an angle in the range of -10° to 10°, in particular 0°, relative to the carrier air inlet flow direction (W). The arcuate deflection described above can of course also be used here. The second annular channel section does not have to be arranged orthogonally to the first annular channel section with an angle in the range of 80° to 100°, in particular 90°. In particular, the second annular channel section can be arcuate.

[0058] This creates a U-shaped flow path in the annular channel, which has a particularly strong effect on increasing back pressure.

[0059] In one embodiment, the air cap of the paint spray gun has an end wall, in particular a front end wall, in particular an end wall in which the compressed air ring outlet opening is arranged and / or formed.

[0060] In one embodiment, a collar extends from an inner side of the end wall of the air cap in an axial direction opposite to the supporting air inlet flow direction. The collar can have one or more of the following features: the collar can be circumferential, in particular radially circumferential; the collar can be cylindrical, in particular axially cylindrical; the collar can be arranged concentrically to the compressed air ring outlet opening. In one embodiment, a collar extends from a front inner surface of the air cap in an axial direction opposite to the supporting air inlet flow direction. The collar can have one or more of the following features: the collar can be circumferential, in particular radially circumferential; the collar can be cylindrical, in particular axially cylindrical; the collar can be arranged concentrically to the compressed air ring outlet opening.

[0061] In one embodiment, the lateral walls of the collar extend in a direction parallel to the carrier air inlet flow direction.

[0062] In one embodiment, the paint nozzle has a sealing element at its end facing away from the outlet opening, wherein the sealing element is arranged at the same radial height as the collar of the air cap.

[0063] In one embodiment, the paint nozzle has an end face. The end face may have one or more of the following features: the end face may be a front end face; the end face may be tapered; the end face may face an inner side of an end wall of the air cap; the end face may face a front inner surface of the air cap.

[0064] In one embodiment, the end face of the paint nozzle has a groove. The groove can have one or more of the following features: the groove can be circumferential, in particular radial; the groove can be annular; the groove can be arranged concentrically to the paint outlet opening of the paint nozzle.

[0065] In one embodiment, the lateral walls of the groove extend in a direction parallel to the carrier air inlet flow direction.

[0066] In one embodiment, the paint nozzle has a sealing element at its end facing away from the outlet opening, wherein the sealing element is arranged at the same radial height as the groove in the paint nozzle.

[0067] In one embodiment, a collar extending from an inner side of an end wall of the air cap and / or a front inner surface of the air cap and extending in an axial direction opposite to the carrier air inlet flow direction engages in a groove in an end face of the paint nozzle in such a way that at least the first annular channel section is formed thereby.

[0068] In one embodiment of the nozzle arrangement according to the invention, the angle (E1-E2) is greater than 90° and less than or equal to 180°, wherein the angle (E1-E2) is in particular greater than 135° and less than or equal to 180°.

[0069] In this way, the direction of extension of the first annular duct section is opposite to the direction of extension of the annular duct inlet section. The air flowing through the first annular duct section thus flows obliquely opposite to the air flowing through the annular duct inlet section. This causes an increase in the dynamic pressure of the air flowing through the annular duct of the nozzle arrangement according to the invention and thus a more even distribution of the supporting air flow. For example, the angle is one of the following: 95°, 100°, 105°, 110°, 115°, 120°, 125°, 130°, 140°, 145°, 150°, 155°, 160°, 165°, 170°, 175°. As the angle (WX) increases between 90° and 180° inclusive, the dynamic pressure increases more than at the lower angle value.

[0070] In one embodiment, the angle (E1-E2) is 180°.

[0071] In this way, the air flowing through the first annular duct section is directed in the opposite direction to the air flowing through the annular duct inlet section. This increases the dynamic pressure and thus distributes the airflow more evenly. It should be understood that a slight deviation from 180° is not harmful.

[0072] In one embodiment, a second annular channel section orthogonal thereto with an angle in the range of 80° to 100°, in particular 90°, is arranged behind the at least one first annular channel section, the angle of the first annular channel section being in particular 180°, and a third axial annular channel section with an angle in the range of -10° to 10°, in particular 0°, relative to the direction of extension of the annular channel inlet section is arranged behind the second annular channel section. The arcuate deflection described above can of course also be used here. The second annular channel section does not have to be arranged orthogonally to the first annular channel section with an angle in the range of 80° to 100°, in particular 90°. In particular, the second annular channel section can be arcuate.

[0073] In this way, a U-shaped configuration is achieved in the annular channel. This has a particularly strong effect on increasing the dynamic pressure. In one embodiment, a collar extending from an inner side of an end wall of the air cap and / or a front inner surface of the air cap and extending in an axial direction opposite to the first direction of extension engages a groove in an end face of the paint nozzle in such a way that at least the first annular channel section is formed.

[0074] Another aspect concerns the use of a paint nozzle with an air cap in a paint spray gun as described in more detail above.

[0075] The features described above, including those from different embodiments, can also be combined with each other, resulting in synergistic interactions that go beyond the sum of the individual effects.

[0076] The invention is explained below using exemplary embodiments, which are described with reference to the following figures.

[0077] Figure 1 is a sectional view of part of an exemplary embodiment of a paint spray gun according to the invention or of a paint spray gun with an exemplary embodiment of a nozzle arrangement according to the invention;

[0078] Figure 2 is a view of part of an exemplary embodiment of a paint spray gun according to the invention; and

[0079] Figure 3 is a view of an exemplary embodiment of a paint spray gun according to the invention or a paint spray gun with an exemplary embodiment of a nozzle arrangement according to the invention.

[0080] Exemplary embodiments are described and explained below with reference to the figures listed above. Like reference symbols or analogous reference symbol structures refer to analogous or interacting components.

[0081] Figure 1 shows a sectional view of part of an exemplary embodiment of a paint spray gun according to the invention or of an exemplary embodiment of a nozzle arrangement according to the invention, which is mounted on a paint spray gun. The paint spray gun comprises a paint spray gun body 10. The paint spray gun body 10 has a first paint interface 11. The paint spray gun body 10 has a first compressed air interface 12 and a fourth compressed air interface 13. A paint nozzle 20 is arranged on the paint spray gun body 10. The paint nozzle 20 has a second paint interface 21, which corresponds to the first paint interface 11. Paint is transported into the flow channel 23 of the paint nozzle 20 via the two paint interfaces 11 and 21. The flow channel 23 has an outlet opening 22 at the end of the paint nozzle 20. The outlet opening 22 is opened or closed by a needle 25, so that a paint flow can be released.The paint flow flows in flow direction Z. An air cap 30 is arranged on or above the paint nozzle 20. The air cap 30 encompasses the paint nozzle 20, so that an annular channel 40 is created between an outer contour 24 of the paint nozzle 20 and the air cap 30, in particular an inner contour of the air cap 30. The annular channel 40 runs between the second compressed air interface 31 and a compressed air ring outlet opening 45. The first compressed air interface 12 and the second compressed air interface 31 are fluidically connected. A carrier air flow flows through the annular channel 40 with the carrier air flow direction X. In the present case, the annular channel 40 has a first annular channel section 41, wherein an angle between the carrier air flow direction X and the paint flow direction Z is 180°. In the present case, the carrier air pressurized flow flows in exactly the opposite direction to the paint flow.This causes an extension of the flow path within the annular channel 40 and thus leads to an increase in back pressure. Furthermore, the annular channel 40 in this case has a second annular channel section 42, which is arranged orthogonally to the first.

[0082] The annular channel 40 further comprises an annular channel inlet section 40a with a supporting air inlet flow direction W. An angle WX between the supporting air inlet flow direction W and the supporting air flow direction X in the first annular channel section 41 is in this case equal to 180°, so that the supporting air flow in the first annular channel section 41 flows in an axial direction opposite to the supporting air flow in the annular channel inlet section 40a.

[0083] The annular channel inlet section 40a extends along a first extension direction E1. The first annular channel section 41 extends along a second extension direction E2. An angle E1-E2 between the first extension direction E1 and the second extension direction E2 is 180° in this case, so that the second extension direction E2 is axially opposite to the first extension direction E1.

[0084] The first annular channel section 41 is arranged in the radial direction closer to the outlet opening 22 of the paint nozzle 20 than the annular channel inlet section 40a.

[0085] Behind the second annular channel section 42 there is in turn arranged a third annular channel section 43 which runs parallel to the flow direction Z of the paint flow or parallel to the inlet flow direction W or parallel to the first extension direction E1, i.e. axially at 0°. In this case there is a U-shape in the side view which further increases the annular channel length, which affects the back pressure. The outer diameter 46 and inner diameter 47 of the annular channel 40 decrease in sections in this case. In this case the carrier air flow flows out of the compressed air ring outlet opening 45. According to the Bernoulli effect, when the outlet opening 22 of the paint nozzle 20 is open, the carrier air flow conveys the paint flow out of the outlet opening 22 so that a spray jet is created. In this case control bores 32 are arranged above the fourth axial annular channel section 44, which in this case is identical to the third axial annular channel section 43.The control bores 32 and the fourth axial annular channel section 44 are fluidically connected and lie along one axis. The control bores 32 are arranged on two opposite sides of the compressed air ring outlet opening 45 in the air cap 30. For example, the number of control bores 32 comprises four or six. By arranging the control bores 32 directly above the fourth axial annular channel section 44 on the same axis, the flow of the carrying air flow through the control bores 32 is increased. The carrying air flow is, so to speak, branched off from the annular channel 40. The compressed air flow exiting through the control bores 32 serves in particular to improve the atomization of the spray jet. The air cap 30 is clamped against the paint gun body 10 by a union nut 60. The paint nozzle 20 is arranged between them. The paint nozzle 20 is mounted in the paint gun body 10 by means of a thread.

[0086] The paint spray gun body 10 in this case has a fourth compressed air interface 13. The air cap 30 in this case has a third compressed air interface 33. The fourth compressed air interface 13 and the third compressed air interface 33 are fluidically connected. A jet-shaped compressed air is transported through these compressed air interfaces 13, 33. The air cap 30 also has two horns 34 and 35. A flow channel 39 is arranged in each of the horns, which is fluidically connected to the third compressed air interface 33. In this case, three horn air bores 36, 37, and 38 are arranged in the two horns 34, 35. The horn air bores 36, 37, and 38 are fluidically connected to the flow channel 39. A jet-shaped compressed air flow emerges through the horn air bores 36, 37, 38, which forms the spray jet. The three horn air holes 36, 37, 38 have the jet shape flow directions y1, y2 and y3.The angle y1-Z between the first jet-shaped flow direction y1 and the paint flow direction Z lies in a range between 30° and 45°. The angle y2-Z between the second jet-shaped flow direction y2 and the paint flow direction Z lies in a range between 60° and 85°. The angle y3-Z between the second jet-shaped flow direction y3 and the paint flow direction Z lies in a range between 60° and 85°. The angles y2-Z and y3-Z are different in this case. The angles y2-Z and y3-Z can also be identical. Figure 2 shows a view of part of an exemplary embodiment of a paint spray gun 100 according to the invention. In the present case, neither an air cap nor a union nut nor a paint nozzle are arranged on the paint spray gun body 110. The paint interface 111 can be seen inside the paint spray gun body 110.The first compressed air interface 112 and the fourth compressed air interface 113 are visible around the paint interface 111. Further compressed air interfaces 114 and 115 can also be seen, which are also used to provide the supporting air flow and the jet-shaping compressed air flow.

[0087] Figure 3 shows an exemplary paint spray gun 200 according to the invention or an exemplary embodiment of a nozzle arrangement according to the invention, which is mounted on a paint spray gun. The paint spray gun 200 comprises a paint spray gun body 210. The paint spray gun body 210 is made of an aluminum alloy in the present case, but can also be made of plastic, and has a handle. The paint spray gun 200 further comprises a paint nozzle 250, which is not visible here because it is covered by an air nozzle ring and an air cap 260. The paint spray gun 200 further comprises an actuating bracket element 230. The actuating bracket element 230 can be made of plastic or metal and is designed to be detachably connected to the paint spray gun body 210. For example, this detachable connection can be made possible via a plug-in or snap-in connection.The actuating bracket element 230 is rotatably mounted via a bolt in a bore of the paint gun body 210. Actuating the actuating bracket element 230 activates a needle valve for applying paint and an air valve for releasing compressed air.

[0088] Reference symbol

[0089] 10, 110, 210 spray gun bodies

[0090] 11, 111 Paint interface

[0091] 12, 112 first compressed air interface spray gun body

[0092] 13, 113 fourth compressed air interface spray gun body

[0093] 114, 115 additional compressed air interfaces

[0094] 20, 250 paint nozzle

[0095] 21 second paint interface paint nozzle

[0096] 22 Outlet opening paint nozzle

[0097] 23 Flow channel paint nozzle

[0098] 24 Outer contour paint nozzle

[0099] 25 needle

[0100] 30, 260 air cap

[0101] 31 second compressed air interface air cap

[0102] 32 control holes

[0103] 33 third compressed air interface air cap

[0104] 34, 35 horns

[0105] 36, 37, 38 Horn air holes

[0106] 39 Flow channel

[0107] 40 ring canal

[0108] 40a Ring channel inlet section

[0109] 41 first ring canal section

[0110] 42 second, orthogonal ring channel section

[0111] 43 third, axial ring channel section

[0112] 44 fourth, axial annular channel section

[0113] 45 Compressed air ring outlet opening

[0114] 46 outer diameter

[0115] 47 inner diameter

[0116] 60 union nut

[0117] WT rag air inlet flow direction

[0118] 100, 200 paint spray gun

[0119] 230 operating bracket element

[0120] Z Paint flow direction

[0121] X Air flow direction

[0122] E1 first extension direction

[0123] E2 second extension direction y1, y2, y3 jet shape flow directions of the horn air holes

Claims

Claims 1. A paint spray gun (100), comprising: a paint spray gun body (10) with a first paint interface (11) and a first compressed air interface (12); a paint nozzle (20) with a second paint interface (21) corresponding to the first paint interface (11) and a paint outlet opening (22), wherein a flow channel (23) for a paint flow in a paint flow direction (Z) is arranged between the second paint interface (21) and the outlet opening (22); an air cap (30) with a second compressed air interface (31); wherein the first compressed air interface (12) is fluidically connected to the second compressed air interface (31); wherein the air cap (30) surrounds the paint nozzle (20) such that an annular channel (40) for a carrier air flow with a compressed air annular outlet opening (45) is created between an outer contour (24) of the paint nozzle (20) and the air cap (30);wherein the annular channel (40) has at least one first annular channel section (41) with a carrying air flow direction (X), wherein an angle (XZ) between the carrying air flow direction (X) and the paint flow direction (Z) is greater than 90° and less than or equal to 245°, so that the carrying air flow flows in an axial direction opposite to the paint flow.; 2. Paint gun (100) according to claim 1, wherein the angle (XZ) is greater than 90° and less than or equal to 180°, or wherein the angle (XZ) is greater than 135° and less than or equal to 180° 3. Paint spray gun (100) according to claim 1 or 2, wherein the angle (XZ) is equal to 180°.

4. Paint spray gun (100) according to claim 3, wherein behind the at least one first annular channel section (41) with an angle of 180° there is arranged a second annular channel section (42) orthogonal thereto with an angle of 90° and behind the second annular channel section (42) there is arranged a third axial annular channel section (43) with 0° relative to the paint flow direction (Z).

5. Paint spray gun (100) according to one of the preceding claims, wherein at least one of an outer diameter (46) of the annular channel (40) and an inner diameter (47) of the annular channel (40) decreases at least in sections over a length between the second compressed air interface (31) and the compressed air ring outlet opening (45).

6. Paint spray gun (100) according to one of the preceding claims, wherein the air cap (30) has a plurality of control bores (32) distributed radially over a circumference; wherein the annular channel (40) has at least one axial fourth annular channel section (44); and wherein the plurality of control bores (32) are arranged in the axial direction above the axial fourth annular channel section (44), so that at least a portion of the carrier air / compressed air flow flows into the plurality of control bores (32) without deflection from the axial fourth annular channel section (44).

7. Paint spray gun (100) according to one of the preceding claims, wherein the paint spray gun body (10) comprises a fourth compressed air interface (13), wherein the air cap (30) comprises a third compressed air interface (33) for supplying jet-forming compressed air, which is fluidically connected to the fourth compressed air interface (13), and wherein the air cap (30) has at least two horns (34, 35) each with at least one, in particular at least two, in particular three, horn air bores (36, 37, 38) for forming a spray jet, wherein the horn air bores (36, 37, 38) are connected to the third compressed air interface (33) so that a jet-forming compressed air flow flows out of the horn air bores (36, 37, 38).

8. Paint spray gun (100) according to claim 7, wherein at least one (36) of the horn air bores has a first jet shape flow direction (y1), wherein an angle (y1-Z) between the first jet shape flow direction (y1) and the paint flow direction (Z) is between 30° and 45°.

9. Paint spray gun (100) according to claim 7 or 8, wherein at least two (37, 38) of the horn air bores have a second jet shape flow direction (y2) and a third jet shape flow direction (y3), wherein an angle (y2-Z) between the second jet shape flow direction (y2) and the paint flow direction (Z) and an angle (y3-Z) between the second jet shape flow direction (y3) and the paint flow direction (Z) is between 60° and 85°.

10. Paint spray gun (100) according to claim 9, wherein the angle (y2-Z) between the second jet shape flow direction (y2) and the paint flow direction (Z) and the angle (y3-Z) between the second jet shape flow direction (y3) and the paint flow direction (Z) are different.

11. Paint spray gun (100) according to one of the preceding claims, further comprising an air distribution ring for connecting the paint spray gun body (10) to the paint nozzle (20).

12. Paint spray gun (100) according to one of the preceding claims, wherein the air cap (30) has an end wall, in particular a front end wall, in particular an end wall in which the compressed air ring outlet opening (45) is arranged and / or formed.

13. Paint spray gun (100) according to claim 12, wherein a collar extends from an inner side of the end wall of the air cap (30) in an axial direction opposite to the paint flow direction (Z), in particular a circumferential, in particular radially circumferential, and / or cylindrical, in particular axially cylindrical, and / or concentrically arranged to the compressed air ring outlet opening (45) collar.

14. Paint spray gun (100) according to one of the preceding claims, wherein a collar extends from a front inner surface of the air cap (30) in an axial direction opposite to the paint flow direction (Z), in particular a circumferential, in particular radially circumferential, and / or cylindrical, in particular axially cylindrical, and / or concentrically arranged to the compressed air ring outlet opening (45) collar.

15. Paint spray gun (100) according to claim 13 or 14, wherein the lateral walls of the collar extend in a direction parallel to the paint flow direction (Z).

16. Paint spray gun (100) according to one of claims 13 to 15, wherein the paint nozzle (20) has a sealing element at its end facing away from the outlet opening (22), the sealing element being arranged at the same radial height as the collar of the air cap (30).

17. Paint spray gun (100) according to one of the preceding claims, wherein the paint nozzle (20) has an end face, in particular a front and / or conically tapered end face and / or end face facing an inner side of an end wall of the air cap (30) and / or end face facing a front inner surface of the air cap (30).

18. Paint spray gun (100) according to claim 17, wherein the end face of the paint nozzle (20) has a groove, in particular a circumferential, in particular radially circumferential, and / or annular, and / or concentrically arranged groove to the paint outlet opening (22) of the paint nozzle (20).

19. Paint spray gun (100) according to claim 18, wherein the lateral walls of the groove extend in a direction which is parallel to the paint flow direction (Z).

20. Paint spray gun (100) according to claim 18 or 19, wherein the paint nozzle (20) has a sealing element at its end facing away from the outlet opening (22), the sealing element being arranged at the same radial height as the groove in the paint nozzle (20).

21. Paint spray gun (100) according to one of the preceding claims, wherein a collar which extends from an inner side of an end wall of the air cap (30) and / or a front inner surface of the air cap (30) and extends in an axial direction opposite to the paint flow direction (Z) engages in a groove in an end face of the paint nozzle (20) in such a way that at least the first annular channel section (41) is formed thereby.

22. A paint spray gun (100), comprising: a paint spray gun body (10) with a first compressed air interface (12); a paint nozzle (20) with a paint outlet opening (22); an air cap (30) with a second compressed air interface (31); wherein the first compressed air interface (12) is fluidically connected to the second compressed air interface (31); wherein the air cap (30) surrounds the paint nozzle (20) such that an annular channel (40) for a carrier air flow with a compressed air annular outlet opening (45) is created between an outer contour (24) of the paint nozzle (20) and the air cap (30);wherein the annular channel (40) has at least one annular channel inlet section (40a) with a supporting air inlet flow direction (W) and a first annular channel section (41) with a supporting air flow direction (X), wherein an angle (WX) between the supporting air inlet flow direction (W) and the supporting air flow direction (X) in the first annular channel section (41) is greater than 90° and less than or equal to 245°, so that the supporting air flow in the first annular channel section (41) flows in an axial direction opposite to the supporting air flow in the annular channel inlet section (40a); 23. Paint gun (100) according to claim 22, wherein the angle (WX) is greater than 90° and less than or equal to 180°, or wherein the angle (WX) is greater than 135° and less than or equal to 180° 24. Paint spray gun (100) according to claim 22 or 23, wherein the angle (WX) is equal to 180°.

25. Paint spray gun (100) according to one of claims 22 to 24, wherein behind the at least one first annular channel section (41) with an angle of 180° there is arranged a second annular channel section (42) orthogonal thereto with an angle of 90° and behind the second annular channel section (42) a third axial annular channel section (43) is arranged at 0° relative to the carrier air inlet flow direction (W).

26. Paint spray gun (100) according to one of claims 22 to 25, wherein the air cap (30) has an end wall, in particular a front end wall, in particular an end wall in which the compressed air ring outlet opening (45) is arranged and / or formed.

27. Paint spray gun (100) according to claim 26, wherein a collar extends from an inner side of the end wall of the air cap (30) in an axial direction opposite to the carrier air inlet flow direction (W), in particular a circumferential, in particular radially circumferential, and / or cylindrical, in particular axially cylindrical, and / or concentrically arranged to the compressed air ring outlet opening (45) collar.

28. Paint spray gun (100) according to one of claims 22 to 27, wherein a collar, in particular a circumferential, in particular radially circumferential, and / or cylindrical, in particular axially cylindrical, and / or concentrically arranged to the compressed air ring outlet opening (45), extends from a front inner surface of the air cap (30) in an axial direction opposite to the carrier air inlet flow direction (W).

29. A paint spray gun (100) according to claim 27 or 28, wherein the lateral walls of the collar extend in a direction parallel to the carrier air inlet flow direction (W).

30. Paint spray gun (100) according to one of claims 27 to 29, wherein the paint nozzle (20) has a sealing element at its end facing away from the outlet opening (22), the sealing element being arranged at the same radial height as the collar of the air cap (30).

31. Paint spray gun (100) according to one of claims 22 to 30, wherein the paint nozzle (20) has an end face, in particular a front and / or conically tapered end face and / or end face facing an inner side of an end wall of the air cap (30) and / or a front inner surface of the air cap (30).

32. Paint spray gun (100) according to claim 31, wherein the end face of the paint nozzle (20) has a groove, in particular a circumferential, in particular radially circumferential, and / or annular, and / or concentrically arranged groove to the paint outlet opening (22) of the paint nozzle (20).

33. A paint spray gun (100) according to claim 32, wherein the lateral walls of the groove extend in a direction parallel to the carrier air inlet flow direction (W).

34. Paint spray gun (100) according to claim 32 or 33, wherein the paint nozzle (20) has a sealing element at its end facing away from the outlet opening (22), wherein the sealing element is arranged at the same radial height as the groove in the paint nozzle (20).

35. Paint spray gun (100) according to one of claims 22 to 34, wherein a collar which extends from an inner side of an end wall of the air cap (30) and / or a front inner surface of the air cap (30) and extends in an axial direction opposite to the carrier air inlet flow direction (W) engages in a groove in an end face of the paint nozzle (20) in such a way that at least the first annular channel section (41) is formed thereby.

36. Use of a paint nozzle (20) with an air cap (30) in a paint spray gun (100) according to one of claims 1 to 21 or in a paint spray gun (100) according to one of claims 22 to 35.

37. Nozzle arrangement for a paint spray gun (100) at least comprising an air cap (30) and a paint nozzle (20), wherein the air cap (30) engages around the paint nozzle (20) such that an annular channel (40) is formed between an outer contour (24) of the paint nozzle (20) and the air cap (30); wherein the annular channel (40) has at least one annular channel inlet section (40a) which extends along a first extension direction (E1), wherein the annular channel (49) has a first annular channel section (41) which extends along a second extension direction (E2), wherein an angle (E1-E2) between the first extension direction (E1) and the second extension direction (E2) is greater than 90° and less than or equal to 245°, so that the second extension direction (E2) is opposite to the first extension direction (E1) in the axial direction.

38. Nozzle arrangement according to claim 37, wherein the first annular channel section (41) is arranged in the radial direction closer to a paint outlet opening (22) of the paint nozzle (20) than the annular channel inlet section (40a).

39. Nozzle arrangement according to claim 37 or 38, wherein the angle (E1-E2) is greater than 90° and less than or equal to 180°, or wherein the angle (E1-E2) is greater than 135° and less than or equal to 180° 40. Nozzle arrangement according to one of claims 37 to 39, wherein the angle (E1-E2) is equal to 180°.

41. Nozzle arrangement according to one of claims 37 to 40, wherein a collar which extends from an inner side of an end wall of the air cap (30) and / or a front inner surface of the air cap (30) and extends in an axial direction opposite to the first extension direction (E1), engages in a groove in an end face of the paint nozzle (20) in such a way that at least the first annular channel section (41) is formed thereby.

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