Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
  • B05B3/00—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements
  • B05B3/02—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements
  • B05B3/10—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements discharging over substantially the whole periphery of the rotating member
  • B05B3/1007—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements discharging over substantially the whole periphery of the rotating member characterised by the rotating member
  • B05B3/1014—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements discharging over substantially the whole periphery of the rotating member characterised by the rotating member with a spraying edge, e.g. like a cup or a bell
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
  • B05B15/00—Details of spraying plant or spraying apparatus not otherwise provided for; Accessories
  • B05B15/50—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter
  • B05B15/55—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter using cleaning fluids
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
  • B05B3/00—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements
  • B05B3/02—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements
  • B05B3/10—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements discharging over substantially the whole periphery of the rotating member
  • B05B3/1035—Driving means; Parts thereof, e.g. turbine, shaft, bearings
  • B05B3/1042—Means for connecting, e.g. reversibly, the rotating spray member to its driving shaft
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
  • B05B3/00—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements
  • B05B3/02—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements
  • B05B3/10—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements discharging over substantially the whole periphery of the rotating member
  • B05B3/1064—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements discharging over substantially the whole periphery of the rotating member the liquid or other fluent material to be sprayed being axially supplied to the rotating member through a hollow rotating shaft

Definitions

• the invention relates to a bell cup for a rotary atomizer for spraying off coating material (e.g. paint). Furthermore, the invention relates to a rotary atomizer with such a bell cup.
• coating material e.g. paint
• rotary atomizers are usually used as application devices, which rotate a bell cup by means of a turbine, which sprays the paint off a ring-shaped peripheral spray edge.
• the bell cup is usually mounted on the turbine shaft of the rotary atomizer by means of a screw connection with a fine thread.
• this type of attachment of the bell cup to the turbine shaft of the rotary atomizer has various disadvantages.
• a disadvantage of the screw connection is that the fine thread can become dirty, which requires a relatively time-consuming cleaning of the fine thread, since contamination of the fine gain also causes an imbalance in the bell cup, which in the worst case can lead to bearing failure.
• a further disadvantage of the known type of fastening is that numerous revolutions of the bell cup relative to the turbine shaft are required in order to screw the bell cup onto the turbine shaft.
• the object of the invention is therefore to improve the attachment of a bell cup to a rotary atomizer.
• the invention solves this problem with a bell cup according to the invention according to the main claim.
• the bell cup according to the invention is used for mounting on a rotary atomizer for spraying off coating material (e.g. paint).
• coating material e.g. paint
• the invention is not limited to bell cups that are provided for the application of paint. Rather, the bell cup according to the invention can also be designed for the application of other coating agents. The invention is therefore not limited to paint with regard to the coating agent to be applied.
• bell cup used within the scope of the invention is to be understood in general terms and also includes, for example, spray disks of disk atomizers. However, the bell cup according to the invention is preferably a bell cup in the actual sense.
• the bell cup according to the invention has, in accordance with the known bell cups, first of all a spray body with an annular spray edge for spraying off the coating agent.
• the bell cup according to the invention in accordance with the known bell cups, has a hub part for mounting the bell cup on a rotatable hollow shaft of the rotary atomizer.
• the hub part and the spray-off body in the preferred exemplary embodiment of the invention are separate components which can be connected to one another, for example, by a screw connection.
• the spray body and the hub part are in one piece and together form a single component.
• the bell cup according to the invention also has a fastening device in order to fasten the bell cup to the hollow shaft of the rotary atomizer in a form-fitting manner.
• the bell cup according to the invention is now distinguished from the prior art by the structural design and functioning of this fastening device.
• this is not a screw connection.
• the fastening device in the bell cup according to the invention has an annular clamping surface in the outer lateral surface of the hub part that is inclined to the axis of rotation of the bell cup and which, when installed, forms a contact surface for a clamping element (e.g. clamping ball) of the rotary atomizer to rest around the bell cup with an axial clamping force on the hollow shaft of the rotary atomizer.
• the fastening device according to the invention therefore has no screw connection, but instead provides a clamping connection.
• connection between the bell cup on the one hand and the hollow shaft of the rotary atomizer on the other hand is therefore preferably carried out without a screw connection within the scope of the invention.
• the fastening device according to the invention can have screw connections between the individual components of the fastening device. However, these screw connections are not used to establish the connection between the bell cup on the one hand and the hollow shaft of the rotary atomizer on the other.
• the fastening device according to the invention initially serves to mechanically fasten the bell cup to the hollow shaft of the rotary atomizer.
• the fastening device according to the invention can also fulfill another function, namely the centering of the bell cup on the hollow shaft of the rotary atomizer.
• the hub part of the bell cup can have a centering cone on the outside for contact with a centering cone of complementary shape in the hollow shaft of the rotary atomizer.
• the hollow shaft of the rotary atomizer thus has a centering cone on the inside at its distal end, which widens in the distal direction.
• the centering cone on the hub part of the bell cup has a centering cone on the outside, which tapers in the proximal direction.
• the two centering cones of the hub part on the one hand and the hollow shaft of the rotary atomizer on the other hand are preferably aligned concentrically to the axis of rotation of the bell cup and have the same cone angle in order to enable a good centering effect.
• the clamping connection mentioned above causes an axial clamping force with which the bell cup is pressed in the axial direction onto the hollow shaft of the rotary atomizer.
• the conical surfaces of the two centering cones of the hub part on the one hand and the hollow shaft of the rotary atomizer on the other hand are pressed against each other axially, which then leads to a good centering effect.
• the hub part of the bell cup therefore preferably has a flat surface on the outside, which is intended to form an axial stop for the bell cup.
• the planar surface on the hub part therefore preferably runs in an annular and concentric manner with respect to the axis of rotation of the bell cup and is preferably aligned at right angles to the axis of rotation of the bell cup.
• the flat surface on the hub part of the bell cup then rests against the end face of the hollow shaft of the rotary atomizer in the assembled state, as a result of which an axial stop is formed.
• the flat surface on the hub part of the bell cup preferably adjoins the centering cone in the axial direction along the axis of rotation, with the flat surface preferably being located in the axial direction between the centering cone and the spraying edge of the bell cup.
• the above-mentioned clamping connection between the bell cup on the one hand and the hollow shaft of the rotary atomizer on the other hand is preferably produced by a clamping ring, which is not part of the bell cup but is located in the associated fastening device in the hollow shaft of the rotary atomizer.
• This clamping ring is preferably screwed into the hollow shaft of the rotary atomizer. This means that a rotation of the clamping ring in the hollow shaft of the rotary atomizer also leads to a corresponding axial displacement of the clamping ring, which can be used to generate the necessary axial clamping forces.
• the turning of the clamping ring to generate the required clamping forces is preferably carried out by the bell cup during assembly of the bell cup.
• the hub part of the bell cup can have a receptacle for a driver, with the driver protruding as a projection in the axial direction from the clamping ring in the hollow shaft of the rotary atomizer and, in the assembled state, protruding in the axial direction into the receptacle in the hub part of the bell cup, so that the Bell plate rotates the clamping ring when rotating during assembly.
• the bell cup is first placed on the hollow shaft in such a way that the driver on the clamping ring protrudes into the receptacle in the hub part of the bell cup.
• the clamping ring is then rotated during the subsequent rotation of the bell cup, which leads to a corresponding axial displacement of the clamping ring.
• the bell cup is then rotated until the centering cones on the hollow shaft of the rotary atomizer on the one hand and on the hub part on the other hand lie on top of each other and the Flat surface on the hub part strikes the end face of the hollow shaft.
• the invention includes a further aspect of the invention which relates to the flushing of the bell cup.
• the bell cup according to the invention in accordance with the known bell cups, has an outer lateral surface which, for example, runs conically and leads to the spray edge of the bell cup on the outside. This outer surface can get dirty in the painting shop and must therefore be cleaned occasionally.
• the bell cup according to the invention in accordance with the known bell cups, preferably has an external rinsing space which is preferably located on the rear side of the bell cup. During a rinsing process, rinsing agent is then introduced into the outer rinsing space of the bell cup.
• the rinsing agent then automatically reaches the outer surface of the bell cup from the external rinsing area, which leads to the cleaning of the outer surface there.
• the distribution of the flushing agent on the outer lateral surface of the bell cup can be promoted here by directing air, which is blown from behind essentially axially onto the outer lateral surface of the bell cup.
• the bell cup according to the invention has an outer rinsing channel in accordance with the known bell discs, the outer rinsing channel starting from a detergent feed in the interior of the bell disc and opening into the outer rinsing chamber at its outlet opening.
• the mode of operation of the external flushing described above is also described, for example, in EP 0 715 896 A2 and EP 2 464 459 B1.
• the hub part on the one hand and the spraying body on the other hand can be separate components that are connected to one another, for example by a screw connection, in particular with an internal thread on the hub part and an external thread on the spraying body of the bell cup. This allows the external flushing channel to run between the hub part and the spray body over part of its length.
• the external rinsing channel in the area between the hub part and the spray body is preferably an annular channel that runs around the entire circumference in a ring shape.
• the outlet opening of the outer rinsing channel opens into the outer rinsing space of the bell cup in order to introduce the rinsing agent into the outer rinsing space.
• the external rinsing channel can form a deflection that causes a change in direction of the flow of rinsing agent in the external rinsing channel.
• the flushing agent flow in the external flushing channel runs upstream in front of the outlet opening, preferably in the distal direction at an angle to the axis of rotation of the bell cup. Downstream behind the deflection, the rinsing agent then preferably enters the outer rinsing space in the proximal direction, different exit angles relative to the axis of rotation of the bell cup being possible.
• the flushing agent flow enters the outside flushing chamber essentially parallel to the axis of rotation of the bell cup from the outlet opening of the outside flushing channel, with a tolerance range of ⁇ 10°, ⁇ 5° or ⁇ 2° being possible.
• the flushing agent flow exiting from the outlet opening of the external flushing channel into the external flushing chamber is inclined outwards, for example at an exit angle of 15° relative to the axis of rotation of the bell cup, with a tolerance range of ⁇ 10°, ⁇ 5° or ⁇ 2° is possible.
• the flushing agent flow emerging from the outlet opening of the external flushing channel into the external flushing chamber is inclined inward, in particular with an exit angle to the axis of rotation of the bell cup of at least 15°, 20° or 25°, with a tolerance range of ⁇ 10°, ⁇ 5° or ⁇ 2° is possible.
• the purpose of this inward tilt is to allow the detergent to detach and swirl around the edge so that it gets everywhere.
• the spray body and the hub part can be in one piece and thus form a single component.
• the spray body on the one hand and the hub part on the other hand are separate components that are mechanically connected to one another, for example by screwing the hub part to the spray body, in particular with an internal thread on the hub part and an external thread on the spray body.
• the invention also claims protection for a correspondingly adapted rotary atomizer.
• the rotary atomizer according to the invention initially has a rotatably mounted hollow shaft in order to rotate the bell cup during operation, the hollow shaft being able to be driven, for example, by a turbine, as is known from the prior art and is therefore not needs to be described in more detail.
• the rotary atomizer according to the invention also has a fastening device which makes it possible to attach the bell cup to the hollow shaft of the rotary atomizer in a form-fitting manner.
• the fastening device allows - as already mentioned - a screw connection between the bell cup on the one hand and the hollow shaft of the rotary atomizer on the other hand.
• the fastening device in the hollow shaft of the rotary atomizer has at least one clamping element (e.g. clamping ball) which is used to rest on a corresponding clamping surface on the hub part of the bell cup in order to clamp the bell cup with an axial clamping force on the hollow shaft of the tighten the rotary atomizer.
• clamping element e.g. clamping ball
• the at least one clamping element is a clamping ball, which has a freedom of movement in the radial direction in the hollow shaft of the rotary atomizer.
• the clamping element In a radially inner clamping position, the clamping element then clamps the bell cup firmly on the hollow shaft of the rotary atomizer.
• the clamping element In contrast, in a radially outer unclamped position, the clamping element releases the bell cup in order to enable assembly or disassembly of the bell cup.
• a cage e.g. ball cage
• the cage preferably being arranged with the clamping element (e.g. clamping ball) inside the hollow shaft of the rotary atomizer.
• the external thread of the cage can be screwed into a corresponding internal thread of the hollow shaft of the rotary atomizer.
• clamping element eg clamping ball
• a clamping ring can be provided which is in the annular gap between the cage and the hollow shaft of the rotary atomizer can be arranged.
• This clamping ring is preferably connected to the hollow shaft of the rotary atomizer by a screw connection, the screw connection having an external thread on the clamping ring and an internal thread in the hollow shaft of the rotary atomizer, so that rotation of the clamping ring relative to the hollow shaft of the rotary atomizer results in a corresponding axial displacement of the clamping ring in the hollow shaft of the rotary atomizer.
• the clamping ring preferably has a clamping surface that is angled toward the axis of rotation of the bell cup and widens in the proximal direction, so that the clamping ring presses the clamping element radially inward into the clamping position when it moves in the proximal direction.
• the clamping ring is rotated in the hollow shaft, which leads to a corresponding axial displacement of the clamping ring, so that the clamping ring finally presses the at least one clamping element (e.g. clamping ball) from the external unclamping position into the internal clamping position.
• the at least one clamping element e.g. clamping ball
• the clamping ring is rotated during the fastening process, which then leads to a corresponding axial displacement of the clamping ring in the hollow shaft of the rotary atomizer.
• This rotation of the clamping ring is preferably brought about by the bell cup, which is first placed during a fastening process and then rotated relative to the turbine shaft.
• This rotation of the clamping ring by the bell cup is made possible by the fact that a driver protrudes from the clamping ring in the axial distal direction and engages in a corresponding receptacle in the hub part of the bell cup, so that the bell cup rotates the clamping ring when it is rotated during assembly or disassembly .
• a certain axial clamping force acts on the rotatable clamping ring, whereby this axial clamping force is converted into a corresponding surface-normal clamping force due to the inclination of the clamping surface of the clamping ring, which is applied to the clamping element (e.g. clamping ball).
• the clamping surface of the clamping ring is angled to the axis of rotation of the bell cup in such a way that a certain force transmission ratio is established between the axial clamping force on the clamping ring on the one hand and the clamping force normal to the surface on the clamping element on the other.
• This power transmission ratio is preferably at most 1:8 and is preferably greater than 1:1, 1:2, 1:4 or 1:6.
• the clamping force normal to the surface on the clamping element is therefore preferably significantly greater than the axial clamping force on the clamping ring.
• a certain frictional force occurs in the screw connection between the clamping ring on the one hand and the hollow shaft of the rotary atomizer on the other hand, which depends on the axial clamping force on the clamping ring.
• the ratio between the frictional force of the screw connection on the one hand and the axial clamping force on the clamping ring on the other hand is preferably at least 0.5:1, 1:1 or 1:2 and is preferably at most 1:6.
• the cage e.g., ball cage
• the cage preferably includes multiple pairs of locking elements (e.g., locking balls), wherein the pairs of locking elements may be circumferentially distributed.
• the pairs of clamping elements are distributed evenly over the circumference, with three pairs being able to be provided, for example.
• the distance between the clamping elements within a pair of clamping elements is preferably smaller than the distance between the clamping elements of adjacent pairs.
• the at least one clamping element e.g. clamping ball
• the at least one clamping element can be made of steel, ceramic, plastic or glass, to name just a few material examples.
• the at least one clamping element bears against a counterpart during operation, which is the clamping surface which is preferably formed on the hub part of the bell cup. It is advantageous here if the at least one clamping element (e.g. clamping ball) on the one hand and the clamping surface on the other consist of different materials, since such a material pairing has proven to be advantageous.
• the at least one clamping element e.g. clamping ball
• the at least one clamping element can be made of ceramic, while the clamping surface or the hub part is made of steel, in particular hardened steel.
• other material pairings of materials to be used which have different material properties, in particular with regard to their properties
• the individual clamping elements eg clamping balls
• the individual clamping elements preferably have a diameter in the range of 1 mm - 5 mm.
• clamping elements can be 3, 4, 5, 6, 7, 8, 9, 10, 11 or 12, for example.
• clamping connection between the angled clamping surface of the clamping ring on the one hand and the clamping element (e.g. clamping ball) on the other hand is preferably self-locking.
• clamping ring can have a wavy section in longitudinal section in order to make the clamping ring elastically flexible in the axial direction.
• the fastening devices in the rotary atomizer and in the bell cup preferably also contain screw connections.
• screw connections There is a risk that such screw connections will come loose during operation.
• a blockage in the hollow shaft of the rotary atomizer leads to a sudden braking of the hollow shaft, which means that the threaded connections are also subjected to a corresponding torque.
• the threaded connections are therefore preferably right-hand threads, while the rotary atomizer is preferably designed such that it rotates the hollow shaft to the left during the painting operation, i.e. counterclockwise when viewed axially in the distal direction. Braking or even a blockage of the hollow shaft of the rotary atomizer then causes the threaded connections to be tightened.
• FIG. 1 shows a sectional view of a bell cup according to the invention in the assembled state on a rotary atomizer.
• FIG. 2 shows a detailed view from FIG. 1 with a clamping ball for clamping the bell cup on the hollow shaft of the rotary atomizer.
• FIG. 3 shows a detailed view from FIG. 1 to explain the external flushing according to the invention, the bold arrows showing the course of the flushing agent flow.
• FIGS. 4A-4C show different variants of the invention for the external flushing with different exit angles of the flushing liquid into the external flushing space of the bell cup.
• FIG. 5 shows a perspective view of a bell cup according to the invention with the fastening device according to the invention.
• FIG. 6 shows a cross-sectional view of the fastening device according to the invention with three pairs of clamping balls.
• FIG. 7 shows a detailed view from FIG. 1 with the centering cones of the bell cup on the one hand and the hollow shaft on the other hand.
• Figures 8A-8DE show various phases during an assembly process.
• the drawings show a bell cup 1, which is partially of conventional design and rotates about an axis of rotation 2 during operation, as will be described in detail below.
• the bell cup 1 comprises, in a conventional manner, a spraying body 3 with a spraying edge 4 running around it in the form of a ring for spraying off the paint to be applied.
• a distributor disk receptacle 5 is arranged centrally on its end face in the spray body 3 , a distributor disk 6 being fastened to the distributor disk receptacle 5 .
• the distributor disk 6 has the task of distributing paint supplied centrally and axially radially outwards on an overflow surface 7 so that the paint then travels outwards along the overflow surface 7 to the annular spray edge 4 and is sprayed off there.
• the spray body 3 of the bell cup 1 has an outer lateral surface 8 that is conically shaped and widens in the distal direction, with the lateral surface 8 leading to the spray edge 4 .
• this outer lateral surface 8 becomes soiled with paint residues, which occasionally makes it necessary to clean the outer lateral surface 8 of the bell cup 1 .
• the spray body 3 has an external rinsing chamber 9 on its rear side, into which rinsing agent is introduced during a cleaning process, as will be described in detail below.
• the rinsing agent then automatically moves outwards from the outer rinsing chamber 9 onto the outer lateral surface 8 of the bell cup 1, with the distribution of the rinsing agent on the outer lateral surface 8 being able to be supported by directing air which is directed from the rear in the axial direction against the outer lateral surface 8 is blown.
• FIG. 1 shows a rotary atomizer 10 with a hollow shaft 11 which is rotated by an air turbine, as is known per se from the prior art, so that the air turbine is not shown for the sake of simplicity.
• the hollow shaft 11 has a centering cone 12 on the inside, as can be seen in particular from FIG.
• the centering cone 12 is used for the exact centering of the bell cup 1 on the hollow shaft 11 of the rotary atomizer 10, as will be described in detail.
• the bell cup 1 also has a hub part 13 which is firmly screwed to the spray body 3 of the bell cup 1 .
• the hub part 13 also has a centering cone 14 on the outside, as can be seen in particular from FIG.
• the centering cones 12, 14 of the hollow shaft 11 of the rotary atomizer 10 on the one hand and the hub part 13 of the bell cup 1 on the other hand have the same cone angle and are in contact with one another in the assembled state, as can be seen in particular from Figure 7, as a result of which the bell cup 1 is positioned on the hollow shaft 11 of the Rotary atomizer 10 is centered.
• the hub part 13 of the bell cup 1 has an annular circumferential planar surface 15 which is aligned at right angles to the axis of rotation 2 of the bell cup 1, as can be seen in particular from FIG.
• the flat surface 15 forms an axial stop for the bell cup 1 and, in the assembled state, lies against an end face 16 of the hollow shaft 11 of the rotary atomizer 10, as can be seen clearly in FIG.
• the centering cones 12, 14 resting against one another bring about centering, while the flat surface 15 forms an axial stop for the bell cup 1 with the end face 16.
• a ball cage 17 is screwed into the hollow shaft 11 of the rotary atomizer 10, the ball cage 17 holding a plurality of clamping balls 18 in a radially movable and captive manner.
• the clamping balls 18 have a radial range of motion between an external unclamping position and an internal clamping position, as will be described in detail below.
• the clamping ring 19 has a clamping surface 21 which is inclined relative to the axis of rotation 2 of the bell cup 1, as shown in particular in FIG. During a fastening process, the clamping surface 21 presses on the clamping ball 18 and can press it out of the radially outer unclamping position into the radially inner clamping position.
• the hub part 13 of the bell cup 1 has a corresponding clamping surface 22 at its proximal end. If the clamping ring 19 now presses the clamping ball 18 with its clamping surface 21 from the radially outer unclamping position into the radially inner clamping position, the clamping ball 18 presses against the clamping surface 22 on the hub part 13, as a result of which the bell cup 1 presses axially on the hollow shaft 11 of the rotary atomizer 10 is clamped.
• the clamping ring 19 presses against the clamping ball 18 with a certain axial clamping force F AXIAL. Due to the inclination of the clamping surface 21 of the clamping ring 19 relative to the axis of rotation 2 of the bell cup 1, a surface-normal clamping force FSPANN acts on the clamping ball 18. The inclination of the clamping surface 21 thus causes a force conversion between the axial clamping force FAXIAL and the surface-normal clamping force FSPANN- The force conversion can have a force transmission ratio of, for example, 1:4, ie the surface-normal clamping force FSPANN is four times as great as the axial clamping force FAXIAL-
• the rotation of the bell cup 1 thus leads to a corresponding rotation of the clamping ring 19, which is also displaced axially in the process.
• the axial displacement of the clamping ring 19 then causes the clamping balls 18 to press radially inwards against the clamping surface 22 at the proximal end of the hub part 13 , as a result of which the hub part 13 is clamped axially in the hollow shaft 11 .
• the hub part 13 on the one hand and the spray body 3 of the bell cup 1 on the other hand are separate components which are connected to one another by a screw connection 25, as can be seen in FIG. 3, for example.
• a paint nozzle 26 runs in the hollow shaft 11 of the rotary atomizer 10 and has two tasks, as is also described in principle in EP 2 464459 B1.
• the paint nozzle 26 supplies the paint to be applied via a central paint channel 27, which paint then impinges axially on the distributor disk 7 and is deflected outwards.
• the paint nozzle contains an external flushing channel 28, as can be seen in particular from FIG.
• the external scavenging channel 28 also directs the scavenging agent forwards to the distributor disc 6 .
• another external scavenging channel 29 branches off from the external scavenging channel 28 and directs part of the scavenging agent to the outside into the external scavenging chamber 9 .
• the external flushing channel 29 runs on a section 30 here between the hub part 13 and the spray body 3 forms a there ring canal. With its outlet opening 31, the external scavenging channel 29 then opens into the external scavenging chamber 9.
• the external rinsing channel 29 forms a deflection for the rinsing agent flow, as can be seen in different variants from FIGS. 4A-4C.
• the flushing agent emerges from the outlet opening 31 at an exit angle a relative to the axis of rotation 2 .
• the exit angle a 0, i.e. the flushing agent exits from the exit opening 31 in the proximal direction parallel to the axis of rotation 2 .
• the purpose of this inward tilt is to allow the detergent to detach and swirl around the edge so that it gets everywhere.
• Figures 8A-8C show different stages in the assembly of the bell cup 1 on the hollow shaft 11 of the rotary atomizer 10.
• FIG. 8C shows the assembly stage.
• the bell cup 1 has already been placed further in the axial direction onto the hollow shaft 11 of the rotary atomizer 10 .
• the bell cup 1 is not yet at its axial stop, which is formed by the flat surface 15 on the hub part 13 on the one hand and the end face 16 of the hollow shaft 11 on the other hand.
• FIG. 8D shows the final assembly stage.
• the plane surface 15 on the hub part 13 of the bell cup 1 rests against the end face 16 of the hollow shaft 11 of the rotary atomizer 10 and thus forms an axial stop.
• the conical surfaces of the centering cones 12, 14 lie on top of each other and cause the bell cup 1 to be precisely centered on the hollow shaft 11 of the rotary atomizer 10.
• the clamping ring 19 is turned in the screw connection 20 so far that it is axially displaced so far that it presses the clamping ball 18 radially inwards with its clamping surface 21 into the clamping position.
• the clamping ball 18 presses against the clamping surface 22 at the proximal end of the hub part 13, as a result of which the hub part 13 and thus also the entire bell cup 1 in the hollow shaft 11 is clamped axially.
• the clamping ring 19 has a corrugated section 32 which enables elastic flexibility of the clamping ring 19 in the axial direction.
• FIG. 6 also shows that three pairs of clamping balls 18 are distributed over the circumference.

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• 2021
  • 2021-10-20 DE DE102021127163.0A patent/DE102021127163A1/de active Pending
• 2022
  • 2022-10-06 JP JP2024523945A patent/JP2024539686A/ja active Pending
  • 2022-10-06 US US18/701,345 patent/US20240416368A1/en active Pending
  • 2022-10-06 WO PCT/EP2022/077823 patent/WO2023066673A1/de not_active Ceased
  • 2022-10-06 EP EP22801743.0A patent/EP4419262A1/de active Pending
  • 2022-10-06 CN CN202280048713.8A patent/CN117693398A/zh active Pending
  • 2022-10-19 MX MX2024004450A patent/MX2024004450A/es unknown
  • 2022-10-19 WO PCT/EP2022/079094 patent/WO2023066996A1/de not_active Ceased
  • 2022-10-19 EP EP22803262.9A patent/EP4419263A1/de active Pending
  • 2022-10-19 US US18/702,138 patent/US20240408627A1/en active Pending
  • 2022-10-19 JP JP2024523946A patent/JP2024538222A/ja active Pending
  • 2022-10-19 KR KR1020247013194A patent/KR20240088975A/ko active Pending
  • 2022-10-19 CN CN202280050163.3A patent/CN117836062A/zh active Pending

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