Bell-shaped plate for a rotary atomizer

Abstract

The invention relates to a bell-shaped plate (1) for a rotary atomizer, comprising a mounting interface (2) for mounting the bell-shaped plate (1) on an atomizer shaft of the rotary atomizer, a bell-shaped body (6) having an outer flushing channel (9) for conducting a flushing agent for cleaning the outer lateral surface (7) of the bell-shaped body (6) with the flushing agent, and comprising a flushing agent guide ring (14), wherein the flushing agent guide ring (14) covers the external mouth opening of the outer flushing channel (9) in the bell-shaped body (6) and, together with the bell-shaped body (6), forms an annularly encircling flushing groove (13) in order to distribute the flushing agent over the entire circumference of the bell-shaped body (6). According to the invention, the joint between the flushing agent guide ring (14) and the bell-shaped body (6) is separated from the mounting interface (2) of the bell-shaped plate (1) in the axial direction.

Description

[0001] DESCRIPTION

[0002] Bell cup for a rotary atomizer

[0003] Technical field of the invention

[0004] The invention relates to a bell cup for a rotary atomizer, in particular for painting motor vehicle body components.

[0005] Background of the invention

[0006] In modern painting systems for painting motor vehicle body components, rotary atomizers are usually used as application devices, which atomize the paint to be applied using a rapidly rotating bell cup.

[0007] Figure 1 shows a cross-sectional view through a conventional bell cup 1, which can be mounted on an atomizer shaft of a rotary atomizer by means of a mounting interface 2 and rotates about a rotation axis 3 during operation. The paint to be applied is fed centrally through a paint tube (not shown) and then flows over an overflow surface 4 to a spray edge 5 of the bell cup 1, where the paint is sprayed off. The overflow surface 4 is located on the front side of a bell body 6, while on the outside of the bell body 6 there is an outer surface 7 which must be cleaned during operation and in particular when changing colors. For this purpose, rinsing agent can be fed centrally from the rotary atomizer, which then reaches a rinsing agent feed 8 inside the bell body 6.From there, the rinsing agent can then pass through an external rinsing channel 9 into an external rinsing chamber 10 located at the rear of the bell body 6. The rinsing agent can then flow outwards from the external rinsing chamber 10 onto the outer surface 7 of the bell cup 1, thereby cleaning it. The flow movement of the lubricant from the external rinsing chamber 10 onto the outer surface 7 of the bell cup 1 can be assisted by blowing shaping air onto the bell cup 1 from behind, as is known per se from the prior art. Although this known bell cup 1 enables the outer surface 7 of the bell cup 1 to be rinsed, this bell cup 1 has various disadvantages that are briefly described below. Firstly, the external rinsing channel 9 must be introduced into the bell body 6 at a specific angle so that an optimal cleaning result can be achieved.This requires precise mounting and alignment of the bell body 6 and the drilling tool during production, which is relatively complex.

[0008] Secondly, the external flushing channel 9 exits the cylindrical part of the bell body 6 at a relatively acute angle, so that the outlet opening of the external flushing channel 9 at the external flushing chamber 10 has an elliptical shape. This leads to undesirable turbulence at the outlet opening of the external flushing channel 9 and impairs the cleaning quality.

[0009] Figure 2 shows another example of a conventional bell cup 1, as known from WO 2023 / 066996 A1. This known bell cup 1 partially corresponds to the bell cup 1 described above and illustrated in Figure 1, so that to avoid repetition, reference is made to the above description, with the same reference numerals being used for corresponding details.

[0010] A special feature of this known bell plate 1 is that the external flushing channel 9 does not open directly into the external flushing chamber 10, but first into an annular groove 11 which runs around the entire circumference of the bell body 6 and is intended to distribute the flushing agent over the entire circumference.

[0011] A further special feature of this known bell cup 1 is that the annular groove 11 is covered on its outer side by a hub part 12, which, together with the bell body 6, encloses an annular, circumferential flushing groove 13. The flushing agent thus flows from the outer flushing channel 9 first into the annular groove 11 and from there further into the flushing groove 13 between the hub part 12 and the bell body 6. From there, the flushing agent then reaches the outer flushing chamber 10.

[0012] This known bell cup 1 avoids the problems of the conventional bell cup according to Figure 1 described above. However, the bell cup 1 according to Figure 2 also has a disadvantage. The hub part 12 must fulfill two functions. Firstly, the hub part 12 is part of the mounting interface 2, which serves to mount the bell cup 1 to the atomizer shaft of the rotary atomizer. Secondly, the hub part 12 is also intended to delimit the flushing groove 13. This dual functionality of the hub part 12 prevents optimization of the hub part 12 for the function of forming the flushing groove 13. Due to its dual function, the hub part 12 is subject to restrictions with regard to material selection and shape, so that the function of forming the flushing groove 13 cannot be optimally realized.

[0013] Finally, with regard to the technical background of the invention, reference should also be made to US 8 851 397 Bl and DE 10 2009 037 604 A1.

[0014] The invention is therefore based on the object of creating an improved bell cup.

[0015] This object is achieved by a bell cup according to the invention according to the main claim.

[0016] The bell cup according to the invention, in accordance with the known bell cups described above, has a mounting interface that serves to mount the bell cup to an atomizer shaft of a rotary atomizer. For example, this mounting interface can comprise a screw connection, i.e., the bell cup is screwed onto the atomizer shaft of the rotary atomizer. However, the invention is not limited to a screw connection with regard to the design and function of the mounting interface. Rather, other types of connection are also possible for mounting the bell cup to the atomizer shaft of the rotary atomizer, such as a clamp connection or a screw connection, to name just a few examples.

[0017] Furthermore, the bell cup according to the invention, in accordance with known bell cups, also comprises a bell body, which can be made, for example, of metal (e.g., titanium, titanium alloy) or plastic, and has an outer surface that should be cleaned during operation, and in particular during a color change. For this purpose, an external flushing channel runs outward in the bell body from an internal flushing agent supply to direct a flushing agent from the internal flushing agent supply to the outer surface of the bell body, as is known per se from the prior art.

[0018] Furthermore, the bell cup according to the invention comprises a rinsing agent guide ring, which is intended to guide the rinsing agent. This rinsing agent guide ring corresponds to the hub part of the conventional bell cup described above, as shown in Figure 2. The rinsing agent guide ring is joined to the bell body at a joint and covers the external outlet opening of the external rinsing channel in the bell body. The rinsing agent guide ring thus forms an annular, circumferential rinsing groove with the bell body to distribute the rinsing agent over the entire circumference of the bell body, as is also the case with the known bell cup according to Figure 2.

[0019] However, the invention differs from the prior art in that the joint between the detergent guide ring and the bell body is separated from the mounting interface of the bell cup in the axial direction. This means that the detergent guide ring is neither functionally nor structurally a component of the mounting interface of the bell cup. In the bell cup according to the invention, the detergent guide ring is therefore not involved in the assembly of the bell cup to the atomizer shaft of the rotary atomizer and therefore does not need to be optimized with regard to this technical function. This makes it possible to optimize the detergent guide ring in terms of shape and material selection exclusively for the technical function, which provides for the guidance of the detergent from the external flushing channel to the outer surface of the bell body.

[0020] Within the scope of the invention, the detergent guide ring can be connected to the bell body using various connection types. This connection is preferably a shrink connection or a press connection. However, other connection types are also possible within the scope of the invention for connecting the detergent guide ring to the bell body. For example, an adhesive connection, a screw connection, or a threaded connection are also possible.

[0021] In a preferred embodiment of the invention, the external flushing channel in the bell cup does not open directly into the external flushing chamber at the rear of the bell body, but rather first into a circumferential annular groove in the bell body, in order to distribute the flushing agent in the annular groove over the entire circumference. During a flushing process, the flushing agent therefore first flows into the external flushing channel and from there into the circumferential annular groove, where the flushing agent is then distributed over the entire circumference, thus enabling a correspondingly uniform cleaning effect across the entire circumference of the bell cup.

[0022] In the preferred embodiment of the invention, the detergent guide ring is essentially L-shaped in cross-section and has a substantially radially extending leg and a substantially axially extending leg. The radially extending leg of the detergent guide ring rests with its free end on the outside of the bell body and is joined there to the bell body. The axially extending leg of the detergent guide ring, in contrast, forms the annular circumferential flushing groove with the bell body.

[0023] In this case, the joint between the radially running leg of the detergent guide ring on the one hand and the bell body on the other hand is located in the axial direction, preferably proximally in front of the external mouth opening of the external flushing channel. The axially running leg of the detergent guide ring, on the other hand, preferably projects distally from the radially running leg of the detergent guide ring and covers the external mouth opening of the external flushing channel in the bell body. This ensures that the detergent emerging from the external flushing channel or from the circumferential annular groove in the bell body initially flows in the distal direction into the flushing groove between the axial leg of the detergent guide ring and the bell body, and then from there in the proximal direction into the external flushing chamber. The detergent flow therefore experiences a reversal of direction, since the detergent flow after emerging from the external flushing channel orfrom the circumferential annular groove initially flows in a distal direction and is then redirected in a proximal direction.

[0024] In the preferred embodiment of the invention, the detergent guide ring has a plurality of web-shaped spacers distributed around its circumference, the free ends of which rest on the bell body, thereby setting a specific gap width of the annular flushing groove. For example, three, four, or five spacers can be provided, which are preferably arranged on the axial end face of the axially extending leg of the detergent guide ring and protrude axially from the detergent guide ring.

[0025] In the preferred embodiment of the invention, there is a specific ratio between the circumference of the detergent guide ring on the one hand and the web width of the spacers measured in the circumferential direction on the one hand, wherein this ratio is preferably in the range of 50-300, 75-200 or 100-150.

[0026] In addition, there is preferably also a certain ratio between the circumference of the flushing agent guide ring on the one hand and the gap width of the flushing groove on the other hand, this ratio preferably being in the range of 200-1,000, 300-900, 400-800, 500-700 or 450-600.

[0027] It was already mentioned above that the detergent guide ring can be joined to the bell body by means of a press connection. Therefore, the bell body preferably has an outer diameter at the joint that is larger than the inner diameter of the detergent guide ring at the joint, in order to form the press connection. The ratio between the outer diameter of the bell body at the joint, on the one hand, and the outer diameter of the bell body, on the other hand, is preferably in the range of 200-6,000, 500-4,000, or 800-2,500 to form a good press connection.

[0028] It should also be noted that the irrigant guide ring has an outer surface that can widen in the distal direction, particularly conically. Thus, the outer surface of the irrigant guide ring can be angled to the rotational axis of the bell cup at an angle that can, for example, be in the range of 0°-30°. On the one hand, this angle allows for adaptation to the atomizer shaft. On the other hand, the tapering of the irrigant guide ring in the proximal direction also allows for the irrigant flow emerging from the irrigating groove to be angled inward.

[0029] In general, it should be mentioned that the detergent guide ring is preferably made of a specific material that has a certain 0.2% yield strength R p o,2 and a certain Young's modulus E. The relationship between the Young's modulus E and the 0.2% yield strength R p o, 2 is preferably in the range of 400-5,000, 600-3,500 or 800-2,500.

[0030] Furthermore, it should also be mentioned in general that the detergent guide ring in the assembled state preferably has a speed resistance of at least 10,000 rpm, 20,000 rpm, 40,000 rpm, 60,000 rpm or 80,000 rpm (rpm: revolutions per minute).

[0031] As briefly mentioned above, the rinsing agent guide ring can reverse the direction of the rinsing agent flow. Thus, the rinsing agent preferably initially exits in a radial direction from the outer opening of the external rinsing channel or via the annular groove. The rinsing agent guide ring then preferably redirects the rinsing agent flow several times, preferably first in an axial and distal direction, then in a radial outward direction, and finally in an axial and proximal direction.

[0032] The bell body according to the invention preferably also has an annular, circumferential outer rinsing chamber that is open in the proximal direction and is arranged on the rear side of the bell body, so that the rinsing agent can flow from the outer rinsing chamber onto the outer surface of the bell body. The annular rinsing groove between the rinsing agent guide ring and the bell body preferably opens directly into the outer rinsing chamber, so that the rinsing agent can flow from the internal rinsing agent supply through the outer rinsing channel into the rinsing groove and from there into the outer rinsing chamber, finally onto the outer surface of the bell body. It should also be mentioned here that the rinsing agent guide ring is preferably arranged entirely within the outer rinsing chamber of the bell body.

[0033] It has already been mentioned above that the detergent enters the external rinsing chamber from the annular rinsing groove between the detergent guide ring on the one hand and the bell body on the other.

[0034] In one variant of the invention, the rinsing agent enters the outer rinsing chamber from the annular rinsing groove essentially parallel to the axis of rotation of the bell plate.

[0035] In another variant of the invention, the flow of detergent exiting the flushing groove into the outer flushing chamber is angled slightly outwards.

[0036] In a further variant of the invention, the rinsing agent flow exiting the rinsing groove is slightly inclined inward. This inward angling of the rinsing agent flow can be facilitated by tapering the outer surface of the rinsing agent guide ring in the direction of the rinsing agent flow (i.e., in the proximal direction) to allow the rinsing agent flow to incline inward.

[0037] In general, it should also be mentioned that the detergent guide ring is preferably arranged coaxially to the bell body.

[0038] The bell body and the detergent guide ring can be made of different materials. For example, the detergent guide ring can be made of plastic, while the bell body is made of metal (e.g., titanium, titanium alloy).

[0039] Furthermore, it should also be mentioned in general that the joint between the detergent guide ring and the bell body preferably directly adjoins the annular groove in the bell body in the axial direction.

[0040] The bell cup according to the invention has been described above alone. However, the invention also claims protection for a rotary atomizer with such a bell cup.

[0041] Other advantageous developments of the invention are characterized in the subclaims or are explained in more detail below together with the description of the preferred embodiment of the invention with reference to the figures.

[0042] Figure 1 shows a cross-sectional view through the conventional bell cup described above.

[0043] Figure 2 shows a cross-sectional view through the known bell cup also described above.

[0044] Figure 3 shows a cross-sectional view through a bell cup according to the invention with a detergent guide ring.

[0045] Figure 4 shows an enlarged detailed view from Figure 4 in the area of ​​the detergent guide ring.

[0046] Figure 5 shows a modification of Figure 4 with an inwardly angled flushing agent flow at the outlet of the flushing groove.

[0047] Figure 6A shows a perspective view of the detergent guide ring.

[0048] Figure 6B shows an enlarged detail view of Figure 6A.

[0049] Figure 7 shows a detailed view of the detergent guide ring.

[0050] Detailed information

[0051] In the following, the embodiment of a bell cup 1 according to the invention shown in Figures 3 to 7 will be described, which partially corresponds to the conventional bell cups 1 described at the outset and shown in Figures 1 and 2, so that in order to avoid repetition, reference is made to the above description, the same reference numerals being used for corresponding details.

[0052] A special feature of the bell cup 1 according to the invention consists in a detergent guide ring 14, which has the task of directing the detergent flow from the external rinsing channel 9 into the external rinsing chamber 10 of the bell cup 1. The detergent guide ring 14 is essentially L-shaped in cross-section and has a radially extending leg 15 and an axially extending leg 16, as can be seen in particular from Figure 4.

[0053] The radially extending leg 15 of the detergent guide ring 14 rests with its free end at a joint 17 on the outer surface of the bell body 6, as can be seen particularly in Figure 4. The detergent guide ring 14 forms a press connection with the bell body 6. For this purpose, the bell body 6 has an outer diameter dA at the joint 17 that is oversized compared to the inner diameter dl (see Figure 7) of the detergent guide ring 14.

[0054] The axially extending leg 16 of the flushing agent guide ring 14, on the other hand, covers the annular groove 11 in the bell body 6 and, together with the bell body 6, forms the annular circumferential flushing groove 13.

[0055] The rinsing agent supplied via the external rinsing channel 9 first enters the annular groove 11 and is distributed there over the entire circumference of the bell cup 1. From the annular groove 11, the rinsing agent then flows through the rinsing groove 13 into the external rinsing chamber 10, from where the rinsing agent finally reaches the outer surface 7 of the bell cup 1 in the conventional manner.

[0056] The flushing groove 13 has a specific gap width b, as can be seen in particular from Figure 4. There is a specific ratio between the circumference of the flushing agent guide ring 14 on the one hand and the gap width b of the flushing groove 13 on the other hand, this ratio being in the range of 450-600.

[0057] Figure 5 shows a modification of the detergent guide ring 14 according to Figure 4. The detergent guide ring 14 here has an outer circumferential surface 18 which is angled relative to the axis of rotation 3 of the bell cup 1. The detergent guide ring 14 therefore tapers in the proximal direction. This enables the detergent flow emerging from the flushing groove 13 to be angled inwards in the proximal direction, as can be seen from Figure 5. The angled circumferential surface 18 also reduces the weight of the detergent guide ring 14, so that excessive mechanical stress does not arise when a shrink or press connection is made to the bell body 6. Furthermore, this has the advantage that the connection is subjected to less stress at speed due to the lower mass. Figure 7 also shows a detailed illustration of the detergent guide ring 14 with an inward-facing outer circumferential surface 18 which is inclined at an angle α to the axis of rotation 3.

[0058] Figures 6A and 6B show perspective views of the flushing agent guide ring 14. It can be seen that the axial leg 16 of the flushing agent guide ring 14 has a plurality of web-shaped spacers 19 on its distal end face, which, in the assembled state, rest on the bell body 6 and thereby adjust the gap width b of the flushing groove 13.

[0059] The individual spacers 19 each have a web width a in the circumferential direction. A specific ratio exists between the circumference of the detergent guide ring 14 on the one hand and the web width a of the spacers 19 measured in the circumferential direction on the other, with this ratio being in the range of 100-150.

[0060] The invention is not limited to the preferred embodiment described above. Rather, the invention also encompasses variants and modifications that also utilize the inventive concept and therefore fall within the scope of protection. In particular, the invention also claims protection for the subject matter and features of the subclaims, independent of the respective claims referred to. The invention thus encompasses various aspects of the invention that enjoy independent protection.

[0061] Advantages of the invention

[0062] The invention enables various advantages, which are briefly explained below.

[0063] • The ring-shaped rinsing groove ensures improved cleaning results, as the rinsing agent can be distributed over the entire circumference of the bell plate.

[0064] • The external flushing channels in the bell body are easier to manufacture because they do not open directly into the external flushing chamber of the bell cup.

[0065] • The cleaning result is significantly improved without the mass of the bell cup increasing significantly.

[0066] • Due to the low mass of the detergent guide ring, it has little influence on the imbalance of the bell cup.

[0067] • The improved cleaning result reduces paint residue and thus imbalance on the bell cup. The bell cup according to the invention enables a compact design.

[0068] The assembly of the inventor measured bell plate is easy, as the detergent guide ring and the bell body can be easily put together.

[0069] The detergent guide ring according to the invention can be easily adapted to any bell plate.

[0070] 1 bell plate

[0071] 2 Mounting interface for mounting the bell cup on an atomizer shaft of a rotary atomizer

[0072] 3 Rotation axis of the bell cup

[0073] 4 Overflow area of ​​the bell cup

[0074] 5 Spray edge of the bell cup

[0075] 6 Bell body of the bell cup

[0076] 7 Outer surface of the bell cup

[0077] 8 Detergent supply in the bell body

[0078] 9 External flushing channel in the bell body

[0079] 10 External rinsing chamber at the back of the bell plate

[0080] 11 Annular groove in the bell body at the outlet opening of the external flushing channel

[0081] 12 Hub part of the bell cup

[0082] 13 Flushing groove between the hub part and the bell body

[0083] 14 Detergent guide ring

[0084] 15 Radial leg of the detergent guide ring

[0085] 16 Axial leg of the detergent guide ring

[0086] 17 Joint between detergent guide ring and bell body

[0087] 18 Outer surface of the detergent guide ring

[0088] 19 Spacers on the detergent guide ring a Width of the spacers in the circumferential direction a Angle of inclination of the outer surface of the detergent guide ring b Gap width of the flushing groove dA Outer diameter of the bell body at the joint with the detergent guide ring dl Inner diameter of the detergent guide ring at the joint with the bell body

Claims

CLAIMS 1. Bell cup (1) for a rotary atomizer, in particular for a rotary atomizer for painting motor vehicle body components, with a) a mounting interface (2) for mounting the bell cup (1) on an atomizer shaft of the rotary atomizer, in particular as a screw connection, b) a bell body (6) with b1) an outer circumferential surface (7), b2) an internal rinsing agent supply (8) for supplying a rinsing agent for external cleaning of the outer circumferential surface (7) of the bell cup (1), and b3) an external rinsing channel (9) running in the bell body (6) for conducting the rinsing agent from the internal rinsing agent supply (8) to an external mouth opening in the bell body (6) for cleaning the outer circumferential surface (7) of the bell body (6) with the rinsing agent, and c) a rinsing agent guide ring (14), wherein the rinsing agent guide ring (14) c1) at a joint (17) is joined to the bell body (6),c2) covers the outer opening of the outer flushing channel (9) in the bell body (6) and c3) forms an annular circumferential flushing groove (13) with the bell body (6) in order to distribute the flushing agent over the entire circumference of the bell body (6), characterized in that d) that the joint (17) between the flushing agent guide ring (14) and the bell body (6) is separated from the mounting interface (2) of the bell cup (1) in the axial direction.

2. Bell cup (1) according to claim 1, characterized in that the detergent guide ring (14) is neither functionally nor structurally a component of the mounting interface (2) of the bell cup (1).

3. Bell cup (1) according to one of the preceding claims, characterized in that the detergent guide ring (14) is joined to the bell body (6) by one of the following types of connection: a) shrink connection, b) press fit, c) adhesive fit, d) screw fit, e) thread fit.

4. Bell cup (1) according to one of the preceding claims, characterized in that the outer flushing channel (9) in the bell body (6) with its outer mouth opening first opens into a circumferential annular groove (11) in the bell body (6) in order to distribute the flushing agent in the annular groove (11) over the entire circumference.

5. Bell cup (1) according to one of the preceding claims, characterized in that a) the flushing agent guide ring (14) is substantially L-shaped in cross section with a radially extending leg (15) and an axially extending leg (16), b) the radially extending leg (15) of the flushing agent guide ring (14) rests with its free end on the outside of the bell body (6) and is joined there to the bell body (6), and c) the axially extending leg (16) of the flushing agent guide ring (14) forms the flushing groove (13) with the bell body (6).

6. Bell cup (1) according to claim 5, characterized in that a) the joint (17) between the radially extending leg (15) of the flushing agent guide ring (14) and the bell body (6) is located proximally in the axial direction in front of the outer mouth opening of the outer flushing channel (9), and b) that the axially extending leg (16) of the flushing agent guide ring (14) projects in the distal direction from the radially extending leg (15) of the flushing agent guide ring (14) and covers the outer mouth opening of the outer flushing channel (9).

7. Bell cup (1) according to one of the preceding claims, characterized in that a) the rinsing agent guide ring (14) has a plurality of web-shaped spacers (19) distributed over its circumference, in particular three, four or five spacers (19), and b) the spacers (19) rest with their free ends on the bell body (6) and thereby set a certain gap width (b) of the annular rinsing groove (13), c) the spacers (19) are preferably arranged on the axial end face of the axially extending leg of the rinsing agent guide ring (14) and protrude in the axial direction from the rinsing agent guide ring (14).

8. Bell cup (1) according to one of the preceding claims, characterized by a) a ratio between the circumference of the flushing agent guide ring (14) and the web width (a) of the spacers (19) in the circumferential direction of 50-300, 75-200 or 100-150, and / or b) a ratio between the circumference of the flushing agent guide ring (14) and the gap width (b) of the flushing groove (13) in the range of 200-1,000, 300-900, 400-800, 500-700 or 450-600.

9. Bell cup (1) according to one of the preceding claims, characterized in that a) the bell body (6) has a specific outer diameter (dA) at the joint (17), b) the detergent guide ring (14) has a specific inner diameter (dl) at the joint (17), c) the outer diameter (dA) of the detergent guide ring (14) at the joint has a specific oversize compared to the inner diameter (dl) of the detergent guide ring (14) in order to form a press connection, and d) the outer diameter (dA) of the bell body (6) at the joint (17) preferably has a ratio of 200-6,000, 500-4,000 or 800-2,500 to the oversize of the bell body (6).

10. Bell cup (1) according to one of the preceding claims, characterized in that a) the rinsing agent guide ring (14) has an outer surface (18) which widens in the distal direction, in particular conically, and / or b) the rinsing agent guide ring (14) has an outer surface (18) which is angled to the axis of rotation (3) of the bell cup (1) at an angle (a) in the range of 0°-30°.

11. Bell cup (1) according to one of the preceding claims, characterized in that a) the rinsing agent guide ring (14) consists of a material with a specific 0.2% yield strength R p o,2 and a certain modulus of elasticity E, and / or b) that the ratio between the modulus of elasticity E and the 0.2% proof strength R p o,2 is in the range of 400-5,000, 600-3,500 or 800-2,500, and / or c) that the flushing agent guide ring (14) in the assembled state has a speed resistance of at least 10,000 rpm, 20,000 rpm, 40,000, 60,000 rpm or 80,000 rpm.

12. Bell cup (1) according to one of the preceding claims, characterized in that a) that the rinsing agent emerges in the radial direction from the outer mouth opening of the external rinsing channel (9) in the bell body (6), and b) that the rinsing agent guide ring (14) repeatedly deflects the rinsing agent emerging from the outer mouth opening of the external rinsing channel (9), preferably b1) initially in the axial and distal direction, b2) then in the radial direction outwards and b3) finally in the axial and proximal direction.

13. Bell cup (1) according to one of the preceding claims, characterized in that a) the bell body (6) has on its rear side an annular, circumferential outer rinsing chamber (10) which is open in the proximal direction, so that the rinsing agent can flow from the outer rinsing chamber (10) onto the outer surface (7) of the bell body (6), and b) the annular rinsing groove (13) opens into the outer rinsing chamber (10), so that the rinsing agent flows from the inner rinsing agent supply (8) through the outer rinsing channel (9) into the rinsing groove (13) and from there into the outer rinsing chamber (10) and finally onto the outer surface (7) of the bell body (6), c) the rinsing agent guide ring (14) is preferably arranged within the outer rinsing chamber (10) of the bell body (6).

14. Bell body (6) according to claim 13, characterized in that a) the flushing agent flow emerging from the annular flushing groove (13) into the outer flushing chamber of the bell body (6) is aligned substantially parallel to the rotational axis (3) of the bell cup (1), in particular with a tolerance range of ±10°, ±5° or ±2°, or b) the flushing agent flow emerging from the annular flushing groove (13) into the outer flushing chamber (10) of the bell body (6) is inclined outwards, in particular with an exit angle to the rotational axis (3) of the bell cup (1) of 15°, in particular with a tolerance range of ±10°, ±5° or ±2°, or c) the flushing agent flow emerging from the annular flushing groove (13) into the outer flushing chamber (10) of the bell body (6) is inclined inwards, in particular with a Exit angle to the rotation axis (3) of the bell cup (1) of at least 15°, 20° or 25°, in particular with a tolerance range of ±10°, ±5° or ±2°,wherein the outer surface of the detergent guide ring (14) preferably tapers in the direction of the detergent flow in order to allow the detergent flow to incline inwards.

15. Bell cup (1) according to one of the preceding claims, characterized in that a) the detergent guide ring (14) is arranged coaxially to the bell body (6), and / or b) the bell body (6) and the detergent guide ring (14) are made of different materials, and / or c) the detergent guide ring (14) is made of plastic, and / or d) the bell body (6) is made of metal, in particular titanium or a titanium alloy, and / or e) the joint (17) between the detergent guide ring (14) and the bell body (6) is directly adjacent to the annular groove (11) in the bell body (6) in the axial direction.

16. Rotary atomizer with a bell cup (1) according to one of the preceding claims. * * * *

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