Paint nozzle assembly for a paint sprayer

Description

[0001] The invention relates to a paint nozzle assembly for a paint spraying device for generating a paint spray jet according to the preamble of claim 1 and to a paint spraying device according to the preamble of claim 11.

[0002] From WO 2017 / 081276 A1, a paint nozzle assembly for a paint spraying device for generating a paint spray jet is known, wherein the paint nozzle assembly comprises a needle, a nozzle body and a seal, wherein the nozzle body comprises a nozzle opening, a paint inlet and a needle guide and wherein the seal divides an interior space enclosed by the nozzle body into an antechamber and a paint space.

[0003] DE 10 2018 104 209 B3 discloses a component mixing nozzle comprising a nozzle housing with at least one component inlet and one component outlet, wherein an axially displaceable nozzle needle is arranged in a recess in the nozzle housing, which can bear sealingly against the nozzle housing with an axial end in the region of the component outlet, wherein the nozzle needle is connected to a diaphragm which is fastened in the nozzle housing, wherein a pressure chamber is arranged in the nozzle housing on the side of the diaphragm facing away from the axial end of the nozzle needle. In this case, the diaphragm is designed as a holding element for the nozzle needle, which guides the nozzle needle axially in the recess and holds it radially therein, wherein the axial region between the diaphragm and the axial end of the nozzle needle in the region of the component outlet is free of bearing elements for the nozzle needle.

[0004] From EP 1 063 018 A1 a spray gun is known which has a needle which is attached to a membrane which is set into vibration by a pulse device, wherein the needle causes a product to be supplied intermittently to a spray channel and wherein the needle extends into a central supply channel of a spray head.

[0005] Finally, DE 22 56 517 A1 discloses a spray gun for viscous liquids comprising a housing. The housing incorporates a first chamber with an inlet for the liquid to be sprayed and a second chamber with an inlet for a control medium of a valve element. The valve element is longitudinally displaceable within the housing toward and away from a valve seat at the liquid outlet of the second chamber. The first chamber and the second chamber are separated from each other by a membrane, together with which the valve element is longitudinally displaceable.

[0006] The invention is based on the object of simplifying maintenance, cleaning, assembly and disassembly of the paint nozzle assembly in a paint nozzle assembly or a paint spraying device with an enlarged installation space for the seal and a minimized volume of a paint chamber when the nozzle is closed.

[0007] This object is achieved by the characterizing features of claim 1 and 11, respectively, based on the features of the preamble of claim 1 and 11, respectively. Advantageous and expedient developments of claim 1 and 11, respectively, are specified in the respective subclaims.

[0008] The paint nozzle assembly for a paint spraying device for generating a paint spray jet comprises a needle, a nozzle body and a seal, wherein the nozzle body comprises a nozzle opening, a paint inlet and a needle guide, wherein the seal divides an interior space enclosed by the nozzle body into a pre-chamber and a paint space, wherein the seal is fixedly connected to the needle, wherein the seal is designed as a membrane seal and is fixedly connected to the nozzle body, wherein the interior space comprises a widening towards the needle guide.The widening creates an enlarged installation space and thus movement space for the seal designed as a diaphragm seal, which makes it possible to use a seal designed as a diaphragm seal with a large outer diameter, so that the deformations to which the seal designed as a diaphragm seal is subject in the various opening positions of the needle are minimized and the seal designed as a diaphragm seal therefore has a long service life.

[0009] According to the invention, the paint nozzle assembly comprises a compression spring, wherein the compression spring is clamped between the needle guide and a collar of the needle in such a way that the needle is pulled out of the nozzle opening. This facilitates cleaning of the paint nozzle assembly, as the paint chamber can be flushed via the paint inlet and the nozzle opening, which is automatically opened by the needle, without the need for any tool to act on the needle. Such a design of the paint nozzle assembly also eliminates the need for a cross bolt running through the needle, which would otherwise be necessary to retract the needle. This significantly simplifies both assembly and disassembly of the paint nozzle assembly.

[0010] It is also intended that the needle seal be deformed toward the nozzle opening when the paint nozzle is closed, such that it partially rests against the front inner surface of the flare, thus minimizing the volume of the paint space. This keeps the paint space in the paint nozzle assembly particularly small when the paint nozzle is closed, so that at most a small amount of paint can dry in the paint nozzle assembly, making cleaning easier because only a small amount of paint residue needs to be removed.

[0011] It is also intended that, when the paint nozzle is fully open, the needle seal is deformed toward the needle guide so that it rests against the rear inner surface of the flare. The seal's flat contact with the rear inner surface relieves pressure at maximum paint flow. This also increases the seal's service life.

[0012] Furthermore, the nozzle body comprises a cylinder-like shell, with the needle guide being formed by a plate-shaped perforated disc molded onto an inner surface of the cylinder-like shell, with a wall of the plate-shaped perforated disc being inclined from the shell toward the compression spring. This allows the needle guide to transfer high compressive forces from the compression spring to the cylinder-like shell of the nozzle body, thus preventing damage to the nozzle body even when using strong compression springs.

[0013] It is also provided that the nozzle body is designed in two parts and comprises a front nozzle body section with the nozzle opening and the paint inlet and a rear nozzle body section with the needle guide, wherein the front nozzle body section comprises a rear flange comprising two steps, wherein the rear nozzle body section comprises a front flange comprising two steps, wherein end faces of the respective outer step lie against one another and are in particular ultrasonically welded or produced as a subsequent plastic overmolding by means of so-called inserts or screwed or glued or held together by at least one clamp and wherein end faces of the respective inner step lie opposite one another with the seal clamped in between.This ensures both a reliable and liquid-tight cohesion of the nozzle body sections and a reliable connection between the seal and the nozzle body.

[0014] Furthermore, it is proposed that the needle and the seal be formed as a single piece, with the seal being made of a plastic and molded onto the needle. This simplifies the assembly of the paint nozzle assembly. For this purpose, the injection molding process could be carried out in two stages, particularly if the needle and the membrane are made of different materials. Alternatively, the injection molding process could also be carried out in one stage, with the needle and the membrane being manufactured from the same material in a single injection molding process.

[0015] It is also provided that the seal is positively connected to the needle, with the needle comprising a radially circumferential groove for accommodating the perforated disc-like seal, into which the seal snaps after elastic expansion. This makes it possible to produce paint nozzle assemblies with minimal effort, whose seals are suitable for different colors and / or pressures.

[0016] Furthermore, the seal is designed to be frictionally connected to the needle, with the needle being glued or welded to the perforated disc-like seal. This also makes it possible to produce paint nozzle assemblies with minimal effort, with seals suitable for different colors and / or pressures.

[0017] It is also planned that the rear inner surface will be formed by the needle guide. This eliminates the need for additional components and saves material.

[0018] Finally, it is intended that the front inner circumferential surface be formed in the region of the rear flange of the front nozzle body section. In this region, the front inner circumferential surface can be easily formed as a draft angle on a front nozzle body section designed as an injection-molded part.

[0019] The paint spraying device according to the invention for generating a paint spray jet comprises a front end, a back end, a paint container, and a paint nozzle assembly, wherein the paint nozzle assembly is designed according to at least one of claims 1 to 11. As a result, the advantages recited in claims 1 to 11 are achieved for the paint spraying device.

[0020] It is also provided that the paint nozzle assembly is accommodated between the front end and the back end in such a way that the paint nozzle assembly is connected to the front end exclusively by a positive and / or non-positive fit, and is also connected to the back end exclusively by a positive and / or non-positive fit. This makes it possible to easily separate the paint nozzle assembly from the remaining components of the paint sprayer in a non-destructive, reassemblable manner, and to conveniently clean it, or to replace it with a new or refurbished paint nozzle assembly and then reconnect it to the remaining components of the paint sprayer.

[0021] Finally, the paint sprayer is also provided with a fan, which is particularly designed as a radial fan, for generating an air flow. This eliminates the need for an air supply hose, thus simplifying the handling of the paint sprayer.

[0022] For the purposes of the invention, a paint nozzle assembly is understood to be an assembly by which a paint jet can be generated and which comprises a longitudinally displaceable needle.

[0023] For the purposes of the invention, a front end of a paint spraying device is understood to be a first housing half of the paint spraying device to which a paint container is connected.

[0024] For the purposes of the invention, a backend of a paint spraying device is understood to be a second housing half of the paint spraying device on which a trigger is arranged.

[0025] For the purposes of the invention, a seal designed as a membrane seal is understood to be a perforated disc-shaped seal whose thickness is so small that the seal can be elastically bent such that a first ring surrounding a hole in the seal and a second ring surrounding an outer circumference of the seal can lie in planes that are parallel to one another and spaced apart from one another.

[0026] Further details of the invention are described in the drawing using schematically illustrated embodiments.

[0027] This shows: Figures 1-3: a paint spraying device according to the invention in side view, sectional side view and exploded view; Figure 4: a side view of the <h2 style=";text-align:left;direction:ltr">Figure 2 and 3 known paint nozzle assembly; Figure 5a, 5b: a sectional side view of the <h2 style=";text-align:left;direction:ltr"> Figure 4shown paint nozzle assembly with the nozzle opening closed and a detailed view in the area of ​​the seal; Figure 6a, 6b: a sectional side view of the <h2 style=";text-align:left;direction:ltr"> Figure 4 shown paint nozzle assembly with the nozzle opening half open and a detailed view in the area of ​​the seal; Figure 7a, 7b: a sectional side view of the <h2 style=";text-align:left;direction:ltr"> Figure 4 shown paint nozzle assembly with the nozzle opening open and a detailed view in the area of ​​the seal and Figure 8: a sectional side view of an embodiment variant of a paint nozzle assembly according to the invention, which is analogous to the <h2 style=";text-align:left;direction:ltr"> Figure 7a shown with the nozzle opening open.

[0028] The <h2 style=";text-align:left;direction:ltr"> Figures 1 to 3show a paint spraying device 101 according to the invention in side view, sectional side view and exploded view. The paint spraying device 101 comprises a front end 201, a back end 301, a paint container 401 and a paint nozzle assembly 1 accommodated between the front end 201 and the back end 301. Here, the paint nozzle assembly 1 is only shown in the <h2 style=";text-align:left;direction:ltr"> Figure 2 and 3 visible.

[0029] From the exploded view of the <h2 style=";text-align:left;direction:ltr"> Figure 3 It can be seen that the paint nozzle assembly 1 is accommodated between the front end 201 and the back end 301, whereby the paint nozzle assembly 1 is first inserted into the front end 201 as far as it will go during assembly and then the front end 201 is pushed into the back end 301 together with the paint nozzle assembly 1.

[0030] The front end 201 also includes an air cap 202 and a union nut 203. After inserting the front end 201 equipped with the paint nozzle assembly 1, it is screwed to the back end 301 using the union nut 203 and with the air cap 202 in between. The paint container 401 can be screwed into the front end 201 before or after the described assembly.

[0031] The backend 301 comprises an electric blower 302 (not shown in detail), with which air is sucked in from the environment U via inlets 303 and blown in the direction of the frontend 201, so that the air is blown out around the paint nozzle assembly 1 and past the paint nozzle assembly 1 via the air cap 202 in such a way that, during operation according to the HVLP spraying process, it returns to the environment U together with a schematically shown paint jet FS emerging from the paint nozzle assembly 1 and forms a paint spray jet FSS with this.

[0032] The backend 301 further comprises a trigger 304. This acts via a mechanism not shown on a cross bolt 306 connected to a spring-loaded plunger 305 in such a way that the spring-loaded plunger 305 can be retracted by means of the trigger 304 against a tension spring 307.

[0033] In the in the <h2 style=";text-align:left;direction:ltr"> Figure 2 In the position shown, a nozzle opening 2 of the paint nozzle assembly 1 is closed by a needle 3 of the paint nozzle assembly 1, since the trigger 304 is not actuated and the tension spring 307 presses the plunger 305 with such a pressure force against a rear end 3b (see <h2 style=";text-align:left;direction:ltr"> Figure 3 ) of the needle 3, so that it pushes the needle 3 out of a position in the <h2 style=";text-align:left;direction:ltr"> Figure 7a shown open position C into a position shown in the <h2 style=";text-align:left;direction:ltr"> Figure 2 and the <h2 style=";text-align:left;direction:ltr"> Figure 5ashown closed position A. This occurs because the spring force of the tension spring 307 is greater than the pressure force of the compression spring 4.

[0034] If a user confirms the trigger 304 in the direction of arrow x, the tension spring 307 is compressed so that the pressure spring 4 can press the needle 3 against the plunger 305 in the direction of arrow x while being supported by the needle guide 8 and resting on a collar 3c of the needle 3, and the needle 3 reaches the <h2 style=";text-align:left;direction:ltr"> Figure 5a shown closed position A towards open position C (see <h2 style=";text-align:left;direction:ltr"> Figure 7a ), whereby the plunger 305 is displaced by the needle in the direction of arrow x.

[0035] In the <h2 style=";text-align:left;direction:ltr"> Figure 4 the ink nozzle assembly 1 is shown in side view and the <h2 style=";text-align:left;direction:ltr"> Figure 5a , 6a and 7ashow the paint nozzle assembly 1 in a sectional side view, with the needle 3, a seal 5 and the pressure spring 4 in different positions, namely the closed position A (see <h2 style=";text-align:left;direction:ltr"> Figure 5a ), the open position C (see <h2 style=";text-align:left;direction:ltr"> Figure 7a ) or an intermediate position B (see <h2 style=";text-align:left;direction:ltr"> Figure 6a ) are located. In the <h2 style=";text-align:left;direction:ltr"> Figure 5b , 6b and 7b is one to the <h2 style=";text-align:left;direction:ltr"> Figure 5a or 6a or 7a show a matching detailed view of the paint nozzle assembly 1 in the area of ​​the seal 5.

[0036] From the <h2 style=";text-align:left;direction:ltr"> Figure 5aIt can be seen that the needle 3 is surrounded by a nozzle body 6. The nozzle body 6 comprises a nozzle opening 2, a paint inlet 7 and a needle guide 8. The seal 5 divides an interior space 9 enclosed by the nozzle body 6 into an antechamber 10 and an ink chamber 11. The seal 5 is designed as a membrane seal and is fixedly connected to the needle 3. Furthermore, the seal 5, designed as a membrane seal, is fixedly connected to the nozzle body 6. The interior space 9 comprises a widening 12 towards the needle guide 8.

[0037] A paint nozzle 13 is formed by the needle 3 and the nozzle opening 2.

[0038] Here, the seal 5 of the needle 3 is deformed in the direction of the nozzle opening 2 when the ink nozzle 13 is closed or the needle 3 is in the closed position A in such a way that it partially rests against a front inner surface 12a of the widened portion 12, so that a volume VA11 of the ink space 11 is minimized both compared to a volume VB11, which the ink space 11 occupies in the intermediate position B, and compared to a volume VC11, which the ink space 11 occupies in the open position C. Here, the seal 5 in the closed position A of the needle 3 rests with a front circular surface KF5a against the front inner surface 12a (see <h2 style=";text-align:left;direction:ltr"> Figures 5a and 5b ). In the open position C of the needle 3, the seal 5 rests with a rear circular surface KF5b on a rear inner surface 12b of the expansion (see <h2 style=";text-align:left;direction:ltr"> Figures 7a, 7b ).

[0039] In the intermediate position B of the needle 3, the seal 5 with the front circular surface KF5a and the rear circular surface KF5b lies contact-free between the front inner surface 12a and the rear inner surface 12b of the widening 12 of the interior 9 (see <h2 style=";text-align:left;direction:ltr"> Figures 6a, 6b ).

[0040] In this way, the seal 5 can be supported on the rear inner surface 12b in the open position C of the needle 3, i.e. when the ink nozzle 13 is fully open, so that it is only slightly stressed by the pressure of the ink flowing through the ink chamber 11.

[0041] The nozzle body 6 comprises a hollow cylinder-like casing 14, wherein the needle guide 8 is formed by a plate-shaped perforated disc 15, which is integrally formed on an inner surface 16 of the hollow cylinder-like casing 14, and wherein a wall 17 of the plate-shaped perforated disc 15 is inclined from the casing 14 toward the compression spring 4. As a result, the perforated disc 15, which forms the needle guide 8, is inclined in such a way that it can effectively transmit a compressive force emanating from the compression spring 4 to the casing 14.

[0042] In the depictions of the <h2 style=";text-align:left;direction:ltr"> Figures 5a to 7b It can be assumed that these show the paint nozzle assembly 1 in the installed state, so that it can always be assumed that the spring-loaded plunger (see <h2 style=";text-align:left;direction:ltr"> Figure 2 ) depending on the position of the trigger presses against the free end 3b of the needle 3 so that the compression spring 4 as shown in the <h2 style=";text-align:left;direction:ltr"> Figure 5a , 6a and 7ashown, is compressed to varying degrees. Here, the compression spring 4 is in the closed position A ( <h2 style=";text-align:left;direction:ltr"> Figure 5a ) is most strongly compressed and the compression spring 4 is in the open position C ( <h2 style=";text-align:left;direction:ltr"> Figure 7a ) is the least compressed.

[0043] From the <h2 style=";text-align:left;direction:ltr"> Figures 5a to 7bIt is also evident that the nozzle body 6 is constructed in two parts and comprises a front nozzle body section 18 with the nozzle opening 2 and the ink inlet 7, and a rear nozzle body section 20 with the needle guide 8. The front nozzle body section 18 comprises a rear flange 19 comprising two steps 19a, 19b. The rear nozzle body section 20 comprises a front flange 21 comprising two steps 21a, 21b. End faces 19c, 21c of the respective outer steps 19a, 21a abut one another and are ultrasonically welded. End faces 19d, 21d of the respective inner steps 19b, 21b lie opposite one another with the seal 5 clamping between them (see <h2 style=";text-align:left;direction:ltr"> Figure 5b ).

[0044] The seal 5 is positively connected to the needle 3, wherein the needle 3 comprises a radially circumferential groove 5a for receiving the perforated disc-like seal 5 (see <h2 style=";text-align:left;direction:ltr"> Figure 5b), into which the seal 5 is snapped after an elastic expansion. The needle 3 and the seal 5 together form a two-part sliding insert 22, which is arranged in the nozzle body 6 and relative to the nozzle body 6 along a longitudinal axis L1 (see <h2 style=";text-align:left;direction:ltr"> Figure 5a ) of the paint nozzle assembly 1 is movable.

[0045] The rear inner surface 12b is formed by the needle guide 8. The front inner surface 12a is formed in the region of the rear flange 19 of the front nozzle body section 18.

[0046] It is, for example, from the <h2 style=";text-align:left;direction:ltr"> Figure 7bIt can be seen that the seal 5 designed as a membrane seal is designed as a perforated disk-shaped seal which has a hole 51 in which the needle 3 is received. A thickness D5 of the seal 5 is so small that the seal 5 is elastically deformable or elastically bendable such that an inner edge 52 of the seal 5, which encloses the hole 51, and an outer edge 53 surrounding the seal 5 lie in planes E52 and E53 which are parallel to one another and spaced apart from one another when the needle 3 is in the closed position A or the open position C or in a position between the intermediate position B and the closed position A or between the intermediate position B and the open position C.

[0047] In the <h2 style=";text-align:left;direction:ltr"> Figure 8A paint nozzle assembly 901 is shown in a sectional side view. This paint nozzle assembly 901 represents a variant of the paint nozzle assembly shown in the preceding figures, which differs from the variant shown in the preceding figures only by a different design of a sliding insert 922. Therefore, with regard to the remaining components of the paint nozzle assembly 901 and their basic functioning, reference is made to the description of the paint nozzle assembly shown in the preceding figures.

[0048] The sliding insert 922 comprises a needle 903 and a seal 905, which are formed as a one-piece component that forms the sliding insert 922. The seal 905 is made of a plastic and is molded onto the needle 903.

[0049] According to a further embodiment variant not shown, it can also be provided that a sliding insert is designed in such a way that the seal is non-positively connected to the needle, wherein the needle is glued or welded to the perforated disc-like seal for this purpose.

[0050] In all versions, the diaphragm seal undergoes rolling deformation when the needle is moved. This prevents the paint nozzle assembly from undergoing wear, which would occur with a sliding seal.

[0051] According to a variant embodiment not shown, it is also provided that the paint nozzle assembly is integrally connected to another component of the paint spraying device and in particular to the front end. List of reference symbols:

[0052] 1Paint nozzle assembly of 101 2Nozzle opening 3Needle 3bRear end of 3 3cCollar of 3 4Pressure spring of 3 5Seal 5aRadial circumferential groove 6Nozzle body of 1 7Paint inlet of 6 8Needle guide 9Interior of 6 10Antechamber of 90 11Paint chamber of 9 12Widening of 11 12Front inner surface of 12 12bRear inner surface of 12 13Paint nozzle 14Hollow cylinder-like casing 15Disc-shaped perforated disc 16Inner surface 17Wall of 15 18Front nozzle body section 19Rear flange 19aOuter step of 19 19bInner step of 19 19cEnd face of 19a 19dEnd faces of 19b 20Rear nozzle body section 21Front flange 21aOuter step 21bInner step 21cEnd face of 21a 21dEnd faces of 21b 22Sliding insert 51Hole in 5 52Inner edge of 5 around 51 53Outer edge of 5 101Paint sprayer 201Front end of 101 202Air cap 203Union nut 301Backend of 101 302Electric blower 303Inlet at 301 for U 304Trigger 305Spring-loaded plunger 306Cross bolt 307Tension spring of 305 401 ink containers of 101 901Paint nozzle assembly (variant) 903Needle 905Seal 922Sliding insert A Closed position of 3 B Intermediate position of 3 C Open position of 3 D5 Thickness of 5 E52, E53 Level of 52 or 53 FS Paint jet FSS Paint spray jet KF5 Circular area of ​​5 KF5 Front circular area KF5 Rear circular area L1 Longitudinal axis of 1 U Surroundings VA11 Volume of 11 in the closed position A VB11 Volume of 11 in the intermediate position B VC11 Volume of 11 in the open position C x Arrow direction

Claims

1. Paint nozzle assembly (1; 901) for a paint spraying device (101) for creating a paint spray jet (FS), - wherein the paint nozzle assembly (1; 901) comprises a needle (3; 903), a nozzle body (6) and a seal (5; 905), - wherein the nozzle body (6) comprises a nozzle opening (2), a paint feed (7) and a needle guide (8), and - wherein the seal (5; 905) subdivides an interior (9) enclosed by the nozzle body (6) into an antechamber (10) and a paint chamber (11), - wherein the seal (5; 905) is connected fixedly to the needle (3; 903), - wherein the seal (5; 905) is in the form of a membrane seal and is connected fixedly to the nozzle body (6), - wherein the interior (9) comprises a diverging portion (12) as far as the needle guide (8), characterized - in that the paint nozzle assembly (1; 901) comprises a compression spring (4), wherein the compression spring (4) is clamped in place between the needle guide (8) and a collar (3c) of the needle (3; 903) in such a way that the needle (3; 903) is extracted from the nozzle opening (2).

2. Paint nozzle assembly according to Claim 1, characterized in that, with the paint nozzle (13) closed, the seal (5; 905) is deformed in the direction of the nozzle opening (2) by the needle (3; 903) in such a way that it bears partially on a front inner lateral surface (12a) of the diverging portion (12) such that a volume (VA11) of the paint chamber (11) is minimized.

3. Paint nozzle assembly according to Claim 1, characterized in that, with the paint nozzle (13) fully open, the seal (5; 905) is deformed in the direction of the needle guide (8) by the needle (3; 903) in such a way that it bears on a rear inner lateral surface (12b) of the diverging portion (12).

4. Paint nozzle assembly according to Claim 1, characterized in that the nozzle body (6) comprises a hollow-cylinder-like shell (14), wherein the needle guide (8) is formed by a plate-like perforated disc (15) which is integrally formed on an inner lateral surface (16) of the hollow-cylinder-like shell (14), wherein a wall (17) of the plate-like perforated disc (15) is inclined from the shell (14) in the direction of the compression spring (4).

5. Paint nozzle assembly according to at least one of the preceding claims, characterized in that the nozzle body (6) is formed in two parts and comprises a front nozzle body portion (18) with the nozzle opening (2) and the paint feed (7) and a rear nozzle body portion (20) with the needle guide (8), wherein the front nozzle body portion (18) comprises a rear flange (19) comprising two stages (19a, 19b), wherein the rear nozzle body portion (20) comprises a front flange (21) comprising two stages (20a, 20b), wherein end faces (19c, 21c) of the respective outer stages (19a, 21a) bear on one another and are in particular ultrasonically welded or produced as a subsequent plastics overmoulding by means of so-called insert parts or screwed together or adhesively bonded or held together by at least one clamp, and wherein end faces (19d, 21d) of the respective inner stages (19b, 21b) lie opposite one another with the seal (5; 905) clamped in between.

6. Paint nozzle assembly according to at least one of the preceding claims, characterized in that the needle (903) and the seal (905) are formed in one piece, wherein the seal (905) is formed from a plastic and is moulded onto the needle (903).

7. Paint nozzle assembly according to at least one of Claims 1 to 5, characterized in that the seal (5) is connected to the needle (3) by a form fit, wherein, in order to receive the perforated-disc-like seal (5), the needle (3) comprises a radially encircling groove (5a) into which the seal (5) is snap-fitted after elastic expansion.

8. Paint nozzle assembly according to at least one of Claims 1 to 5, characterized in that the seal is connected to the needle by a force fit, wherein the needle is adhesively bonded or welded to the perforated-disc-like seal.

9. Paint nozzle assembly according to Claim 2, characterized in that the rear inner lateral surface (12b) is formed by the needle guide (8).

10. Paint nozzle assembly according to Claim 5, characterized in that the front inner lateral surface (12a) is formed in the region of the rear flange (19) of the front nozzle body portion (18).

11. Paint spraying device (101) for creating a paint spray jet (FS), comprising a front end (201), a back end (301), a paint container (401) and a paint nozzle assembly (1; 901), characterized in that the paint nozzle assembly (1; 901) is configured according to at least one of Claims 1 to 10.

12. Paint spraying device according to Claim 11, characterized in that the paint nozzle assembly (1; 901) is received between the front end (201) and the back end (301) in such a way that the paint nozzle assembly (1; 901) is both connected to the front end (201) only by a form fit and / or by a force fit and connected to the back end (301) only by a form fit and / or by a force fit.

13. Paint spraying device according to Claim 11 or 12, characterized in that the paint spraying device comprises a fan (302) for creating an air flow.