Shaped air ring for a rotary atomizer and rotary atomizer with shaped air ring

Abstract

The shaped air ring for a rotary atomizer according to the invention comprises a ring-shaped arrangement of shaped air nozzles (5), each shaped air nozzle having a nozzle channel (8). The nozzle channel (8) has a channel inlet orifice (9) and a channel outlet orifice (10), wherein the channel outlet orifice (10) has an outlet orifice height (t2) and an outlet orifice width (a2). The outlet orifice width (a2) is greater than the outlet orifice height (t2).

Description

Technical Field

[0001] This invention relates to a forming air ring for a rotary atomizer and a rotary atomizer having a forming air ring. Such a rotary atomizer is typically used for coating workpieces with a coating material and includes a bell shaft and a bell arranged on the bell shaft for this purpose. With the aid of the forming air nozzle and the rotating bell, a fine and uniform jet of coating material is generated for coating the workpiece. Background Technology

[0002] A forming air ring with multiple forming air nozzles for a rotary atomizer is known from prior art EP2099570B1. The forming air nozzles are arranged in the forming air nozzle ring and coaxially aligned with the bell shaft. The forming air nozzles release the forming air flow coaxially with the front to the bell shaft to form the jet stream released by the bell.

[0003] In the first embodiment of the forming air ring described in EP2099570B1, the forming air nozzle is aligned within the forming air ring such that the central axis of the forming air flow radially passes outward through the spray edge of the bell without contacting the bell, wherein the radial distance between the central axis of the forming air flow and the spray edge is approximately 3 mm. In this embodiment, the total axial length of the bell is relatively short. Therefore, the ratio between the radius of the spray edge and the axial length of the bell's casing surface is approximately 1.6. Thus, the radius of the bell is greater than its total axial length. In this first embodiment, since the outlet of the forming air nozzle is located close to the spray edge, the air consumption of the forming air can be kept low. However, a disadvantage of this is that the individual airflows generated by the forming air nozzle at the spray edge can still be clearly identified as separate airflows. Therefore, a uniform forming airflow does not dominate at the spray edge. The trajectories of individual paint droplets are thus affected differently by the forming air.

[0004] In the second embodiment of the forming air ring described in EP2099570B1, the forming air nozzles in the forming air ring are aligned such that the central axis of the forming air flow impacts the outer casing surface of the bell cup with a radial coverage of 2 mm. Therefore, the forming air flow is directly guided to the outer casing surface of the bell cup. In this second embodiment, the total axial length of the bell cup is relatively large. Therefore, the axial extension of the outer casing surface is greater than the radius of the bell cup's spray edge. The individual air flows generated by the forming air nozzles thus merge, i.e., they merge before impacting the spray edge. Therefore, a uniform forming air flow impacts the spray edge. The trajectories of the individual paint droplets are thus more uniformly affected by the forming air than in the first embodiment. However, a disadvantage of the second embodiment is that the forming air consumption is greater than in the first embodiment because the outlet of the forming air nozzle is farther from the spray edge. Summary of the Invention

[0005] The purpose of this invention is to provide a shaping air ring for a rotary atomizer, which can provide uniform shaping air while minimizing the consumption of compressed air used to generate the shaping air.

[0006] The paint droplets are advantageously affected in a very uniform manner by the shaped air ring according to the invention.

[0007] This objective is achieved by a shaped air ring for a rotary atomizer having the features described in claim 1 of the patent.

[0008] The forming air ring for a rotary atomizer according to the invention comprises annularly arranged forming air nozzles, each forming air nozzle having a nozzle channel. The nozzle channel has a channel inlet orifice and a channel outlet orifice, wherein the channel outlet orifice has an outlet orifice height and an outlet orifice width. The outlet orifice width is greater than the outlet orifice height.

[0009] Advantageous further developments of the invention arise from the features described in the dependent patent claims.

[0010] In one embodiment of the shaped air ring according to the invention, the channel inlet orifice has an inlet orifice width, wherein the inlet orifice width and the outlet orifice width have different dimensions.

[0011] In another embodiment of the shaped air ring according to the invention, the inlet orifice width is smaller than the outlet orifice width.

[0012] In the case of the formed air ring according to the invention, the channel outlet orifice can also be provided with a diameter of 0.3 mm. 2 Up to 1.5 mm 2 The cross-sectional surface within the range.

[0013] In the case of the shaped air ring according to the invention, the ratio of the inlet orifice width to the outlet orifice width can also be provided to be between 1 and 4.

[0014] In the case of the shaped air ring according to the invention, the number of channel outlet orifices is advantageously between 40 and 80.

[0015] In a further development of the forming air ring, the forming air nozzles are formed and arranged such that the channel outlet orifices of two adjacent forming air nozzles are in contact with each other.

[0016] In another embodiment of the shaped air ring according to the invention, an axially extending web is provided, which defines a nozzle passage.

[0017] In a further development of the shaped air ring according to the invention, the grooves are located between the webs in every case.

[0018] In a further development of the shaped air ring according to the invention, the web tapers in the downstream direction. The advantage of this is that the airflow widens in each case and converges to form a uniform total airflow.

[0019] In another embodiment, the shaped air ring according to the invention includes an outer air guide ring and an inner air guide ring defining a nozzle passage.

[0020] The shaped air ring according to the invention is advantageously made of solvent-resistant plastic, aluminum or titanium.

[0021] Furthermore, a rotating atomizer is proposed, comprising the aforementioned forming air ring and a rotating spray cup with a spray edge. The nozzle channel is configured such that the forming air jet generated by the forming air nozzle is guided to the spray edge. Therefore, air does not bounce off the cup. The coating material agglomerates thus become more concentrated. The alignment of the forming air jet with the edge has the advantage that the air acts directly at the location where atomization occurs and supports atomization.

[0022] With further development of rotary atomizers, the nozzle channel is configured such that the shaped air jet impacts the rotary spray cup between 0 mm and 3 mm in front of the spray edge. The coating material agglomerates thus become larger, resulting in less aggregation.

[0023] In another further development of the rotary atomizer, the nozzle channel is configured such that the forming air jet does not contact the spray edge. The distance between the spray edge and the forming air jet is preferably between 0 and 3 mm. Therefore, the coating material agglomerates become more concentrated.

[0024] The shaped air jet is aligned with and passes over the edge, creating the possibility of directing the air inward. Therefore, a narrower jet pattern can be produced.

[0025] In another further development of the rotary atomizer, an air nozzle is provided, which is arranged concentrically with the shaping air nozzle. The shaping air nozzle and the air nozzle can operate independently of each other. Attached Figure Description

[0026] The present invention will be explained in more detail below with reference to 21 figures and several exemplary embodiments.

[0027] Figure 1 A first possible embodiment of the shaped air ring according to the invention and a bell cup are shown in longitudinal section.

[0028] Figure 2 An exploded view shows a first embodiment of the shaped air ring according to the present invention.

[0029] Figure 3 A first embodiment of the shaped air ring according to the invention is shown in longitudinal section.

[0030] Figure 4 A first embodiment of the shaped air ring according to the present invention is shown in a front view.

[0031] Figure 5 The outer air guide ring of the shaped air ring is shown in longitudinal section.

[0032] Figure 6 The internal air guide ring of the shaped air ring is shown in longitudinal section.

[0033] Figure 7 The cross-section of the external air guide ring is shown in a three-dimensional view.

[0034] Figure 8 A possible embodiment of a rotary atomizer having a shaped air ring according to the invention is shown in a three-dimensional view.

[0035] Figure 9 The downstream end of the rotating atomizer with a shaped air ring is shown in longitudinal section.

[0036] Figure 10 A second possible embodiment of the shaped air ring according to the present invention is shown in a three-dimensional view.

[0037] Figure 11 A second embodiment of the shaped air ring according to the invention is shown in part in a three-dimensional view.

[0038] Figure 12The internal air guide ring is shown in a three-dimensional view in the case of a second embodiment of the shaped air ring according to the invention.

[0039] Figure 13 The external air guide ring is shown in a three-dimensional view in the case of a second embodiment of the shaped air ring according to the invention.

[0040] Figure 14 The external air guide ring is shown in a 3D view.

[0041] Figure 15 Another embodiment of the external air guide ring is shown in a three-dimensional view.

[0042] Figure 16 A cross-section of another embodiment of the external air guide ring is shown in a three-dimensional view.

[0043] Figure 17 A third possible embodiment of the shaped air ring and the bell cup according to the present invention are shown in a three-dimensional view.

[0044] Figure 18 A cross-section viewed from the front is shown of a third embodiment of the shaped air ring according to the present invention.

[0045] Figure 19 A longitudinal section is shown of a third embodiment of the shaped air ring according to the invention, as well as a bell cup.

[0046] Figure 20 A possible embodiment of the downstream section of the rotary atomizer is shown in longitudinal cross-section.

[0047] Figure 21 A possible embodiment of the drive shaft for the turbine and the rotary atomizer is shown in a 3D view. Detailed Implementation

[0048] exist Figures 1-7 The first possible embodiments of the shaped air ring 1 according to the present invention or the components of the shaped air ring 1 according to the present invention are shown respectively.

[0049] In the first embodiment, the shaped air ring 1 includes an outer air guide ring 11 and an inner air guide ring 12.

[0050] The outer air guide ring 11 and the inner air guide ring 12 are preferably configured such that the inner air guide ring 12 can be inserted into the outer air guide ring 11. To define the relative position of the two air guide rings 11 and 12, the outer air guide ring 11 may have a stop 11.1 on its inner side, and the inner air guide ring 12 may have a stop 12.1 on its outer side. During assembly, the two air guide rings 11 and 12 are inserted together until the two stops 11.1 and 12.1 are engaged.

[0051] The outer air guide ring 11 is preferably arranged concentrically with the inner air guide ring 12. The longitudinal axis L of the outer air guide ring 11 and the longitudinal axis L of the inner air guide ring 12 are therefore aligned.

[0052] According to Figures 1 to 7 In the embodiment, the external air guide ring 11 has a row of webs 6 on its downstream end section, the webs 6 being arranged circumferentially on the inner side of the external air guide ring 11.

[0053] In the assembled state, the outer side of the downstream end section 12.2 of the internal air guide ring 12 abuts against the web plate 6.

[0054] Alternatively, the web 6 can also be part of the internal air guide ring 12, such as Figure 12 As illustrated in the example, in the assembled state, the inner side of the downstream end section of the external air guide ring 11 abuts against the web plate 6.

[0055] According to Figures 1 to 7 In the embodiments described, the outer air guide ring 11 in each case has a groove 7 located between the two webs 6. The two adjacent webs 6 form the left and right sides, and the groove 7 located between them forms the lower side of the shaped air passage 8. The top side of the shaped air passage 8 is formed by the outer side of the inner air guide ring 12. The shaped air passage 8 has a channel inlet orifice 9 at its upstream end and a channel outlet orifice 10 at its downstream end. The shaped air passage 8 will also be referred to hereinafter as a nozzle passage.

[0056] The outer side of the downstream end section 12.2 of the internal air guide ring 12 (nozzle wall 5.2) may have a smooth profile (see...). Figure 2 The outer radius of the downstream end section 12.2 is therefore constant, at least in the region of the forming air nozzle 5. In this case, at the downstream end of the nozzle channel 8, the channel outlet orifice 10 has an outlet orifice height t2. The outlet orifice 5.1 of the forming air nozzle 5 therefore has an outlet orifice height t2.

[0057] Conversely, the outer side of the downstream end segment 12.2 may also have a wavy profile (similar to...). Figure 12 (The outline in the middle). The outer radius of the downstream end segment 12.2 is then not constant, at least in the region of the forming air nozzle 5. In this case, the channel outlet orifice 10 on the downstream end of the nozzle channel 8 has an outlet orifice height t2'. The outlet orifice 5.1 of the forming air nozzle 5 therefore has an outlet orifice height t2'.

[0058] In both cases, the outlet orifice width a2 is greater than the outlet orifice height t2 or t2', respectively.

[0059] The forming air nozzle 5 includes a forming air channel 8, a channel inlet orifice 9, and a channel outlet orifice 10. The channel outlet orifice 10 forms the outlet orifice 5.1 of the forming air nozzle 5, which is also referred to as the nozzle outlet 5.1. A plurality of these forming air nozzles 5, preferably 20 to 80, are arranged in a ring within the forming air ring 1.

[0060] The more forming air nozzles 5 present, the more uniform the air distribution on the spray edge 3.1. However, production effort generally also increases with the increase in the number of nozzles.

[0061] It has been shown that 40 forming air nozzles are sufficient for a bell cup with a diameter of 50 mm to distribute the forming air sufficiently and evenly on the spray edge and to keep production effort within limits.

[0062] In the case of 30mm or 70mm bell cups, the number of forming air nozzles can be smaller or larger. For example, a bell cup with a 30mm diameter can therefore be equipped with 30 forming air nozzles. A bell cup with a 70mm diameter preferably has about 60 forming air nozzles.

[0063] The forming air nozzles 5 are preferably arranged in the nozzle ring, and it is advantageous when they are coaxially aligned with the longitudinal axis L.

[0064] The forming air nozzles 5 are preferably arranged at equal intervals. Therefore, the angle α between two adjacent forming air nozzles 5 (see...) Figure 4 The constant is maintained between all adjacent forming air nozzles.

[0065] The forming air nozzle 5, for example, ensures that the coating particles move forward, thereby moving toward the workpiece (not shown).

[0066] According to Figures 1-7 In this embodiment, the web 6 tapers in the downstream direction. Each web 6 has a wedge shape, with the wedge tip located downstream of the forming air channel 8 and formed bluntly. Due to the fact that the web 6 tapers in the downstream direction, the inlet orifice width a1 of the forming air nozzle 5 is smaller than its outlet orifice width a2. The air flowing through the forming air nozzle 5 thus widens in a fan shape.

[0067] Conversely, the web 6 can also have a constant width over its entire length (not shown in the figure). In this case, the inlet orifice width a1 and the outlet orifice width a2 are the same.

[0068] In the case of the forming air ring 1, the channel length b8 of the nozzle channel 8 can be three to five times longer than its outlet orifice width a2. The longer the nozzle channel 8, the greater its air resistance becomes. However, the forming air jet can still be precisely aligned through the longer nozzle channel 8. Therefore, the forming air jet can be more precisely defined when it will impact paint particles.

[0069] Alternatively, in the case of the forming air ring 1, the length b8 of the nozzle channel 8 can be three to five times the width a1 of its inlet orifice. The following also applies here: the longer the nozzle channel 8, the greater its air resistance becomes. However, on the other hand, the forming air jet can still be precisely aligned through the longer nozzle channel 8. Therefore, the forming air jet can be more precisely defined when it will impact paint particles.

[0070] In the case of the forming air ring 1, the length b8 of the nozzle channel 8 can also be three to five times the width a1 of its inlet opening. The following also applies here: the longer the nozzle channel 8, the greater its air resistance becomes. However, on the other hand, the forming air jet can still be precisely aligned through the longer nozzle channel. Therefore, the forming air jet can be more precisely defined when it will impact paint particles.

[0071] If necessary, the shaped air ring 1 according to the invention may also be equipped with additional air nozzles 4. The additional air nozzles 4 are mainly used for the purpose of separately focusing the sprayed or to be sprayed particle streams.

[0072] The additional air nozzles 4 can be formed in the same way as the forming air nozzles 5. The advantage of doing so is that they can be easily cleaned.

[0073] Each additional air nozzle 4 typically has a longitudinal axis. In one embodiment, the longitudinal axis of the additional air nozzle 4 is aligned parallel to the longitudinal axis L of the forming air ring 1. Here, the tilt angle is 0°, wherein the longitudinal axis of the additional air nozzle 4 is tilted toward the longitudinal axis L of the forming air ring 1 in the downstream direction.

[0074] In another embodiment, the longitudinal axis of the additional air nozzle 4 is inclined toward the longitudinal axis L in the downstream direction. This embodiment is exemplified by... Figure 10 As shown in the figure. This has the effect that the shaped air jet 16 generated by the additional air nozzle 4 is inclined in the downstream direction toward the longitudinal axis L. The inclination angle can be, for example, between 0° and 20°.

[0075] The tilt angle affects the airflow on the spray edge 3.1 and the airflow downstream of the spray edge 3.1. Therefore, the tilt angle also affects the aggregation of coating material clusters and the air vortices that may be generated.

[0076] The choice of tilt angle depends on the requirements to be achieved. Therefore, the tilt angle is usually one of several parameters. Further parameters may include radial alignment to the jet edge and the implementation of additional air.

[0077] Alternatively, additional air nozzles 4 can be formed and / or arranged such that the air flowing through them generates vortices (not shown in the figure). To achieve this, the longitudinal axis of the additional air nozzles 4 is arranged in a laterally inclined manner (inclined to the longitudinal axis LA). For this purpose, the additional air nozzles 4 can be arranged in a laterally inclined manner. This creates vortices, with the air exiting from the additional air nozzles 4 rotating along the longitudinal axis L. This is particularly advantageous in the case of highly concentrated clumps of coating material. The formation of unwanted vortices becomes increasingly less. This advantage is especially pronounced when the rotary atomizer is arranged in a fixed manner.

[0078] The downstream end of the internal air guide ring 12 can be flush with the external air guide ring 11, for example, as shown in the example. Figure 3 As shown.

[0079] In another embodiment, the inner air guide ring 12 is not flush with the outer air guide ring 11, but is axially offset rearward. Figure 7 In the diagram, the dashed line "t2" represents the downstream end of the internal air guide ring 12. The dashed line "t2" thus marks the position of the downstream outer edge of the internal air guide ring 12.

[0080] Conversely, the inner air guide ring 12 can also be axially biased forward (not shown in the figure). Therefore, when viewed in the axial direction, the inner air guide ring 12 protrudes beyond the outer air guide ring 12.

[0081] Possible implementations of the rotary atomizer 20, for example Figure 8 As shown. The forming air ring 1 is located at the downstream end of the forming air ring 1. For example... Figure 8 The rotary atomizer 20 shown has a flange 23 at its upstream end, which can be fastened to the robotic arm via the flange.

[0082] In addition to the shaping air nozzle 5, the shaping air ring 1 installed in the rotary atomizer 20 also has an additional air nozzle 4. However, the additional air nozzle 4 is not absolutely necessary.

[0083] In such Figure 9In the illustrated embodiment, the forming air nozzles 5 are aligned such that the forming air jets 15 generated by them impact the jet edge 3.1 of the bell cup 3.

[0084] Conversely, the forming air nozzles 5 can also be aligned so that the forming air jets generated by them (in) Figure 9 The air jet (denoted by reference numeral 15' in the attached drawing) impacts the outside of the bell cup 3 at a defined point. Viewed from upstream, this point is located in front of the jet edge 3.1. The distance c between the point where the shaped air jet 15' impacts the bell cup 3 and the jet edge 3.1 is preferably between 0 and 3 mm.

[0085] The rotary atomizer 20 is advantageously configured to allow the shaped air nozzle 5 and the additional air nozzle 4 to operate independently of each other.

[0086] Possible implementations of the downstream section of the rotary atomizer 20, for example Figure 9 As shown. The rotary atomizer 20 includes a material line 30 for conveying coating material downstream in the direction of the bell cup 3. After the coating material has been discharged from the material line 30, it impacts the distribution plate 32. The largest portion of the coating material is conveyed radially outward to the inner surface of the bell cup 3 with the aid of the distribution plate 32. A smaller portion of the coating material may be thrown back upstream in the direction of the material line 30. This material is then guided into the receiving chamber 34. At least one wall of the receiving chamber 34 is part of the bell cup 3, causing it to rotate with the bell cup. Due to the resulting rotational force, the thrown material is guided via the discharge line 36 to the outer edge of the distribution plate 32, and thus also to the inner surface of the bell cup 3. In this way, the thrown material is neither lost nor accumulates inside the rotary atomizer 20. The inner surface of the bell cup 3 and the receiving chamber 34 can be cleaned via the rinsing agent line 38.

[0087] Molded air rings can also be formed in one piece. One-piece variations of molded air rings are indicated by reference numeral 100, and as shown in the attached figures... Figure 10 and Figure 11 As shown. In this embodiment, the internal air guide ring is part of the formed air ring and is inseparably connected to the formed air ring.

[0088] Alternatively, the nozzle channel 8 can be entirely formed within the component. This is also as... Figure 10 and Figure 11 As shown.

[0089] Alternatively, it can be provided that even if the forming air ring is constructed as several parts, thus including several components, the nozzle channel 8 is entirely formed within the components. The separation of the components therefore occurs outside the area of ​​the nozzle channel 8.

[0090] Another embodiment of the internal air guide ring 212, for example Figure 12 As shown. In this embodiment, the web 6 is part of the inner air guide ring 212. When the air ring is assembled, the web 6 of the inner air guide ring 212 abuts against the inner side of the downstream end section of the outer air guide ring 11. In this embodiment, the outer air guide ring 11 preferably does not have any web or groove (not shown).

[0091] According to Figures 1 to 7 The internal air guide ring 12 is the same as that, according to Figure 12 The internal air guide ring 212 has a groove 7 between the two webs 6 in each case. The two webs 6 and the groove 7 form the left, right, and lower sides of the shaped air channel 8, respectively. The upper side of the shaped air channel 8 is formed by the inner side of the external air guide ring. The shaped air channel 8 has a channel inlet orifice 9 at its upstream end and a channel outlet orifice 10 at its downstream end.

[0092] Here, the forming air nozzle 5 also includes a forming air channel 8, a channel inlet orifice 9, and a channel outlet orifice 10. The channel outlet orifice 10 forms the nozzle outlet 5.1 of the forming air nozzle 5. A plurality of these forming air nozzles 5 (preferably 40 to 80) are also arranged in a circumferential manner within the forming air ring. The forming air nozzles 5 are preferably arranged at equal intervals.

[0093] To guide the external air through ring 211 (see...) Figure 13 An additional air nozzle 4 in the ) supplies compressed air, and orifice 14 may be present in the internal air guide ring 212 (see Figure 12 Compressed air can be guided to nozzle 4 through orifice 14.

[0094] Compressed air can be supplied to the shaping air nozzle 5 through orifice 17 and annular groove 18, which are located in the internal air guide ring 212. The compressed air then flows through orifice 17, annular groove 18, channel inlet orifice 9 and nozzle channel 8 to channel outlet orifice 10.

[0095] In such Figure 13 and Figure 14 In another embodiment of the external air guide ring 211 shown, the web 6 is configured to be more flexible than according to... Figure 7 The outer air guide ring 11 is short. Therefore, the length b6 of the web 6 is shorter than the channel length b8. When the web 6 does not extend to the downstream edge 211.2 of the outer air guide ring 211, as... Figure 13 and Figure 14 As shown, the channel outlet orifices 10 are in contact with each other. Each web 6 has a wedge shape, with the wedge tip located on the downstream side of the shaped air channel 8. (This is in accordance with...) Figures 1 to 7In contrast to the air guide ring 11, the wedge shape is not formed in a blunt manner, but rather in a pointed manner. In the case of the air guide ring 211, the tip of the wedge does not extend all the way to the downstream edge 211.2 of the air guide ring 211.

[0096] Another embodiment of the external air guide ring 311 is as follows: Figure 15 and Figure 16 As shown. Here, the web 6 also tapers in the downstream direction. Each web 6 has a wedge shape, with the wedge tip located on the downstream side of the forming air channel 8. (In accordance with...) Figure 13 and Figure 14 In contrast to the air guide ring 211, in the case of the air guide ring 311, the wedge tip is located on the downstream edge 311.2 of the air guide ring 311.

[0097] The length b6 of the web 6 is the same as the channel length b8. In this embodiment of the air guide ring 311, the channel outlet orifices 10 are therefore only in contact with each other.

[0098] Another possible implementation of the shaped air ring 400 is, for example Figure 17 , Figure 18 and Figure 19 As shown. In addition to the outer air guide ring 411 and the inner air guide ring 412, the formed air ring 400 also includes an intermediate ring 413. The intermediate ring 413 is located between the outer air guide ring 411 and the inner air guide ring 412. The outer air guide ring 411, the intermediate ring 413, and the inner air guide ring 412 are preferably arranged concentrically. However, their longitudinal axes are aligned. The intermediate ring 413 has a web 6 and a groove 7 on its outer and inner surfaces.

[0099] When the air ring 400 is assembled, the outer web plate 6 of the intermediate ring 413 abuts against the inner side of the downstream end section of the outer air guide ring 411. The inner web plate 6 of the intermediate ring 413 abuts against the outer side of the downstream end section of the inner air guide ring 412.

[0100] Here, the two webs 6 and the groove 7 also form three sides of the forming air channel 8 in each case. The fourth side of the outer forming air channel 8 is formed by the inner side of the outer air guide ring 411. The fourth side of the inner forming air channel 8 is formed by the outer side of the inner air guide ring 412. The forming air channel 8 has a channel inlet orifice at its upstream end and a channel outlet orifice at its downstream end.

[0101] In this embodiment of the forming air ring 400, the forming air nozzle 5 also includes a forming air channel 8, a channel inlet orifice 9, and a channel outlet orifice 10. The channel outlet orifice 10 forms the nozzle outlet 5.1 of the forming air nozzle 5. A plurality of these forming air nozzles 5, preferably 40 to 80, are arranged annularly in the forming air ring 1. The forming air nozzles 5 are preferably arranged at equal intervals.

[0102] like Figure 17 and Figure 18 As shown, the forming air nozzle 5 can be formed in a crescent shape or a lens shape, respectively. Figure 17 and Figure 18 As shown, the additional air nozzle 4 can also be formed in a crescent shape or a lens shape, respectively. Such nozzle channels can be easily manufactured.

[0103] In the case of the forming air ring 400, the forming air nozzle 5 and the additional air nozzle 4 are arranged on the same plane. Furthermore, the additional air nozzle 4 is located closer to the spray edge 3.1. Because the forming air nozzle 5 and the additional air nozzle 4 are arranged on the same plane, no step is generated between them. Therefore, the area between the two air streams is smaller, and the area of ​​vortex contamination is also smaller.

[0104] according to Figures 17 to 19 The advantage of this embodiment is that it can be disassembled and therefore easily cleaned. The air channel 8 and the recess 7 are openable along their entire length and therefore allow for better cleaning.

[0105] A possible embodiment of the downstream section of the rotary atomizer 20 is in Figure 20 The diagram shows a cross-section. The rotary atomizer 20 includes a drive shaft 50, which is preferably formed as a hollow shaft. A material conduit may be provided inside the hollow shaft, through which coating material can be delivered in the direction of the rotating spray cup 3. Figure 20 In the illustrated embodiment, the drive shaft 50 is driven by a drive turbine 51. The drive turbine 51 is preferably driven by compressed air. One possible embodiment of the drive turbine 51 and drive shaft 50 is... Figure 21 It is shown in a three-dimensional view.

[0106] In one embodiment of the rotary atomizer, the rotary cup 3 is screwed onto the drive shaft 50. To secure the rotary cup 3 to the drive shaft 50 or to allow its removal, the drive shaft 50 can be blocked, preventing further rotation. A locking device 52 is provided for this purpose. Additionally, one or more slots 50.1 are provided on the upstream end of the drive shaft 50. The locking device 52 has a movably mounted locking pin 53, wherein the locking pin 53 and the slot 50.1 are adapted to each other. When the locking pin 53 protrudes into the slot 50.1, the drive shaft 50 is blocked. If the locking pin 53 is outside the slot 50.1 (see...), the drive shaft 50 is blocked. Figure 20 If so, the drive shaft 50 can rotate.

[0107] Alternatively, the locking pin 53 can be manually pushed into the slot 50.1. However, it can also be provided that the locking device 52 has a compressed air control connector 55 through which the locking pin 53 is pushed into the slot 50.1 by compressed air. The locking pin 53 can be biased with the aid of a spring 54, so that it rests outside the slot 50.1 in its unacted state. When the locking pin 53 is actuated, i.e., pushed into the slot 50.1, the vent 56 ensures that air located below the locking pin 53 in the housing is expelled and that no reverse pressure is built up.

[0108] For example, locking can be achieved via a compressed air control device. For this purpose, a manually actuated pneumatic valve can be provided at the rear of the rotary atomizer. A button can be included in the hose. However, the pneumatic valve can also be provided externally to the rotary atomizer. Locking can also be actuated by an electrically controlled pneumatic valve, which is controlled by a control device.

[0109] The locking pin 53 can only protrude into the slot 50.1 when the drive shaft 50 is in the correct rotational position. When there are multiple slots 50.1, such as four, the drive shaft 50 only needs to rotate almost 90° in the worst case so that the locking pin 53 can be pushed into one of the four slots 50.1.

[0110] The foregoing description of exemplary embodiments according to the present invention is for illustrative purposes only. Various changes and modifications are possible within the context of the present invention. For example, Figures 1 to 20 The different components of the formed air ring shown can therefore be joined together in a manner different from that shown in the figure, and can also be used in different ways. Figure 8 , Figure 9 and Figure 20 The atomizer of the rotating atomizer shown.

[0111] Figure Labels 1. Formed air ring 3. Rotating spray cup 3.1 Spray edge 4 Additional air nozzles 5. Shaped air nozzle 5.1 Outlet orifice / nozzle outlet 5.2 Nozzle wall 6. Web 7 Grooves 8 Nozzle Channels 9. Channel entrance opening 10-channel outlet orifice 11 External air guide ring 11.1 Stopping components 11.2 Downstream Edge 12 Internal air guide ring 12.1 Stopping components 12.2 Downstream end section 14 holes 15. Shaped airflow 15' Shaped Airflow 16. Shaped airflow 17 holes 18 Annular groove 20 Rotary Atomizer 21 Connecting nut 22 Seals 23 Flange 30 Material Pipelines 32 Distribution Board 34 Receiving cavity 36 Discharge pipeline 38 Flushing lines 50 drive shafts 50.1 Groove in the drive shaft 51 Drive Turbine 52 Locking device 53 Locking pins 54 Springs 55 Compressed Air Control Connector 56 Ventilation openings 100 Formed Air Ring 111 External air guide ring 112 Internal air guide ring 211 External air guide ring 211.2 Downstream Edge 212 Internal air guide ring 311 External Air Guide Ring 311.2 Downstream Edge 400 Formed Air Ring 411 External air guide ring 412 Internal air guide ring 413 Intermediate Ring a1 Inlet side opening width / Inlet opening width a2 Outlet side orifice width / Outlet orifice width b6 Web length b8 Nozzle channel length c Distance from the edge of the spray Longitudinal axis of L-shaped air ring Longitudinal axis of LA nozzle channel t2 Outlet orifice height t2' Outlet orifice height The position of the outer edge of the internal air guide ring (t2”). xx axis YY axis ZZ axis α angle

Claims

1. A shaped air ring for a rotary atomizer, The forming air ring includes annularly arranged forming air nozzles (5), each of which has a nozzle channel (8). -The nozzle channel (8) wherein the nozzle channel (8) has a channel inlet orifice (9) and a channel outlet orifice (10). -The channel outlet orifice (10) wherein the channel outlet orifice has an outlet orifice height (t2) and an outlet orifice width (a2), and - wherein the width of the outlet orifice (a2) is greater than the height of the outlet orifice (t2).

2. The formed air ring as described in claim 1, -The channel inlet orifice (9) has an inlet orifice width (a1), and -The inlet orifice width (a1) and the outlet orifice width (a2) have different dimensions.

3. The shaped air ring as described in claim 1 or 2, The inlet orifice width (a1) is smaller than the outlet orifice width (a2).

4. The formed air ring as described in any one of claims 1 to 3, The channel outlet orifice (10) has a diameter of 0.3 mm. 2 Up to 1.5mm 2 The cross-sectional surface within the range.

5. The formed air ring as described in any one of claims 1 to 4, The ratio of the inlet orifice width (a1) to the outlet orifice width (a2) is between 1 and 4.

6. The shaped air ring as described in any one of claims 1 to 5, The number of channel outlet openings (10) ranges from 40 to 80.

7. The formed air ring as described in any one of claims 1 to 6, The channel outlet orifices (10) of two adjacent forming air nozzles (5) are in contact with each other.

8. The formed air ring as described in any one of claims 1 to 7, It has an axially extending web (6), and The nozzle channel (8) is defined by the web (6).

9. The shaped air ring as described in claim 8, In each case, there is a groove (7) between the web (6).

10. The shaped air ring as described in claim 8 or 9, The web (6) tapers in the downstream direction.

11. The formed air ring as described in any one of claims 1 to 10, It includes an outer air guide ring (11) and an inner air guide ring (12), and The nozzle channel (8) is defined by the outer air guide ring (11) and the inner air guide ring (12).

12. The formed air ring as described in any one of claims 1 to 11, It is made of solvent-resistant plastic, aluminum, or titanium.

13. A rotary atomizer having a shaped air ring as described in any one of claims 1 to 12, -Includes a rotating jet cup (3) with a jet edge (3.1). -The nozzle channel (8) is formed such that the shaped air jet (15) generated by the shaped air nozzle (5) is guided to the jet edge (3.1).

14. The rotary atomizer as described in claims 1 to 12, -Includes a rotating jet cup (3) with a jet edge (3.1). -The nozzle channel (8) is formed such that the shaped air jet (15') generated by the shaped air nozzle (5) impacts the rotating jet cup (3) 0 and 3 mm in front of the jet edge (3.1).

15. The rotary atomizer as described in claim 13 or 14, - There is an air nozzle (4) arranged concentrically with the forming air nozzle (5). -The forming air nozzle (5) and the air nozzle (4) therein can operate independently of each other.

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