EP2460591B1 - Tête de buse et pulvérisateur rotatif doté de celle-ci - Google Patents

Tête de buse et pulvérisateur rotatif doté de celle-ci Download PDF

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Publication number
EP2460591B1
EP2460591B1 EP11009306.9A EP11009306A EP2460591B1 EP 2460591 B1 EP2460591 B1 EP 2460591B1 EP 11009306 A EP11009306 A EP 11009306A EP 2460591 B1 EP2460591 B1 EP 2460591B1
Authority
EP
European Patent Office
Prior art keywords
bell cup
circumferential surface
nozzle head
nozzle
outer circumferential
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP11009306.9A
Other languages
German (de)
English (en)
Other versions
EP2460591A1 (fr
Inventor
Markus Albrecht
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Eisenmann SE
Original Assignee
Eisenmann SE
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Eisenmann SE filed Critical Eisenmann SE
Publication of EP2460591A1 publication Critical patent/EP2460591A1/fr
Application granted granted Critical
Publication of EP2460591B1 publication Critical patent/EP2460591B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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, i.e. the spraying being effected by centrifugal forces
    • B05B3/1092—Means for supplying shaping gas
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
    • B05B5/025—Discharge apparatus, e.g. electrostatic spray guns
    • B05B5/04—Discharge apparatus, e.g. electrostatic spray guns characterised by having rotary outlet or deflecting elements, i.e. spraying being also effected by centrifugal forces
    • B05B5/0426—Means for supplying shaping gas

Definitions

  • the invention relates to a nozzle head for a rotary atomizer for applying a coating material to an object with a rotatable about an axis of rotation bell cup having an outflow surface, which coating material can be supplied in such a way that coating material is thrown away from the bell cup.
  • the invention relates to a rotary atomizer for applying a coating material to an article with a nozzle head.
  • Rotary atomizers equipped with a nozzle head of the type mentioned above are used, for example, in the automotive industry to paint objects such as parts of vehicle bodies, or to coat with a protective material.
  • the bell cup serves to atomize the coating material, for which it is rotated about its axis of rotation in operation with very high rotational speeds of 10,000 to 100,000 U min -1.
  • the rotating bell cup is supplied with the selected coating material. Due to centrifugal forces, which act on the coating material, it is driven on the bell cup as a film to the outside, until it reaches a radially outer spoiler lip of the bell cup. There, such high centrifugal forces act on the coating material that it is thrown tangentially in the form of fine coating material droplets.
  • known rotary atomizers operate, for example, electrostatically.
  • the coating material to be applied is charged, whereas the object to be coated is grounded.
  • an electric field is formed between the rotary atomizer and the object, through which the charged coating material is applied to the object in a directionally directed manner.
  • electrostatic operation steering air devices have established in known rotary atomizers. With these, a usually annular shaping air flow is directed onto the spray jet in such a way that it is bundled and the droplets of different sizes are directed directed onto the object to be coated. In some cases, however, strong steering air flows are necessary for this purpose, the generation of which is relatively complicated.
  • Such rotary atomizers are for example off WO 2005/110611 A1 and US 5 984 993 A known.
  • WO 2005/110611 A1 discloses a rotary atomizer with a nozzle head comprising a bell cup.
  • a guide vane means in the form of a circumferential ring is provided, which forms an annular gap surrounding the bell cup, via which a working fluid in the form of compressed air can be blown onto the coating material.
  • US 5 984 993 A discloses a nozzle head for a rotary atomizer, wherein between a bell cup and a guide ring partially surrounding this, a chamber is formed, via which a cleaning agent on the Bell plate can be dispensed.
  • a chamber is formed, via which a cleaning agent on the Bell plate can be dispensed.
  • the coating material thrown away from the bell cup is in the form of droplets of different sizes. If the working fluid, usually air, now exits the dispensing annular gap at a greatly accelerated rate and strikes the larger droplets, these are broken up by the air blast into a plurality of smaller droplets and the spray jet homogenized thereby based on the droplet size. Since smaller droplets are not thrown so far radially outward as on the other hand larger droplets, the resulting spray is compared to the spray, which is generated without the Laval ring nozzle, focused and thereby focused on the object to be coated.
  • the working fluid usually air
  • the outer circumferential surface of the bell cup is surrounded by a rotationally symmetrical to the axis of rotation lateral surface of a guide body, which forms the Laval ring nozzle with the outer circumferential surface of the bell cup.
  • the outer circumferential surface of the Bell plates are used as the flow surface of the Laval ring nozzle.
  • a Laval ring nozzle can be formed particularly well if the outer surface of the bell cup forms a frustoconical surface.
  • a conical annular channel is formed, wherein the lateral surface has a pointing in the direction of the outer surface of the bell cup rotationally symmetrical elevation, which dictates the narrowest point of the annular channel.
  • vanes which are arranged so that upon rotation of the bell cup working fluid, which is located between the outer surface of the bell cup and the lateral surface of the guide body, is conveyed to the dispensing annular gap of the Laval ring nozzle , This can be sucked working fluid from a reservoir to the Laval ring nozzle. An additional conveyor for the working fluid can then be dispensed with.
  • the guide body has at least one through-channel, via which fluid can flow from the environment into the annular channel.
  • no external source for the working fluid longer necessary, but rather serves the ambient atmosphere of the rotary atomizer or the nozzle head.
  • the passage cross section of the Laval annular nozzle is adjustable at least at its narrowest point. As a result, the final speed of the working fluid can be adjusted which flows out of the Laval ring nozzle.
  • the relative position of the bell cup and the guide body relative to each other based on the axis thereof is adjustable.
  • the guide body can be moved relative to the bell cup in the axial direction and fixed in different axial positions.
  • the above-mentioned object is achieved accordingly that the nozzle head is designed according to one of claims 1 to 7.
  • FIG. 1 2 is a total of a rotary atomizer, of which only a head section 4 with a nozzle head 6 is shown.
  • paint can be applied to a not specifically shown item.
  • the nozzle head 6 comprises a rotationally symmetrical bell cup 8.
  • This is formed in the presently described embodiment in total as a hollow truncated cone 10 with a circumferential wall 12 and has a frusto-conical inner surface 14 and a frusto-conical outer surface 16.
  • the bell cup 8 may also have deviating geometries, as they are known per se in bell plates from the prior art.
  • the bell cup 8 is rotatable at high speed about its axis of rotation 18, to which the rotary atomizer 2 comprises a drive means 20 which in the FIGS. 1 and 3 is illustrated only schematically.
  • the bell cup 8 can be driven for example by means of an electric motor or pneumatically.
  • the bell cup 8 rotates in operation at a rotational speed of 10,000 to 100,000 min -1 about its axis of rotation 18th
  • the bell cup 8 is supported by the free end of a bell 8 to the coaxial hollow shaft 22 which is coupled to the drive means 20 and which defines a LackzuGermankanal 24 in the longitudinal direction, which can be fed from a paint reservoir, not shown.
  • the hollow shaft 22 terminates in a perpendicular to the axis of rotation 18 extending mounting flange 26, via which it is connected to the bell cup 8.
  • the bell cup 8 comprises a mounting plate 26 of the hollow shaft 22 complementary annular plate 28 having a central discharge opening 30, in which the Lackzu semiconductorkanal 24 opens into the hollow shaft 22.
  • the bell cup 8 further comprises, in a manner known per se, a baffle plate 32 extending from the ring plate 28 is worn.
  • the baffle plate 32 extends perpendicular to the axis of rotation 18 of the bell cup 8 and is arranged at a small distance from the annular plate 28 in the interior of the bell cup 8.
  • the baffle plate 32 extends radially outward until just before the inner circumferential surface 14 of the bell cup 8, which serves as a frustoconical outflow surface 34.
  • the outer diameter of this outflow surface 34 increases accordingly in the direction of the hollow shaft 22 away.
  • the outflow surface 34 terminates in a peripheral tear-off edge 36.
  • the outer circumferential surface 16 of the bell cup 8 is surrounded by an inner circumferential surface 38, which is rotationally symmetrical to the outer lateral surface 16, of a guide body designed as a conical guide sleeve 40, which is arranged coaxially with the bell cup 8.
  • the guide sleeve 40 has a free end edge 42, which is arranged radially adjacent to the outer circumferential surface 16 of the bell cup 8, so that there is a dispensing annular gap 44 is formed.
  • the inner circumferential surface 38 of the guide sleeve 40 has a collection forming, in the direction of the outer circumferential surface 16 of the bell cup 8 to arched portion 46, which merges into a conical portion 48 which, while maintaining a distance runs parallel to the outer circumferential surface 16 of the bell cup 8.
  • the conical section 48 then opens into a hollow cylindrical support 50 with a constant cross section, which surrounds the hollow shaft 22 and serves to fix the guide sleeve 40 on the rotary atomizer 2.
  • the guide sleeve 40 is mounted stationary relative to the rotatable bell cup 8 with respect to a rotation, but can be displaced in the axial direction and fixed in relation to the bell cup 8 different axial positions become.
  • annular channel 52 is formed between the outer circumferential surface 16 of the bell cup 8 and the inner circumferential surface 38 of the guide sleeve 40, the narrowest point 54 is predetermined by the survey 46.
  • the inner circumferential surface 38 of the guide sleeve 40 coaxial with the bell cup 8 form in this way with the outer lateral surface 16 of the bell cup 8 a Laval annular nozzle 56 which comprises the dispensing annular gap 44, from which a working fluid is blown onto the coating material thrown away from the bell cup 8.
  • the inner lateral surface 38 of the guide sleeve 40 is a first flow surface and the outer lateral surface 16 of the bell cup 8 has a second flow surface of the Laval annular nozzle 56 which lie opposite one another.
  • a rotationally symmetrical Laval annular nozzle 56 is thus formed on the bell cup 8, which comprises the dispensing annular gap 44, from which a working fluid can be blown onto the coating material thrown away from the bell cup 8.
  • the bell cup 8 carries on its outer circumferential surface 16 in the circumferential direction uniformly distributed vanes 60. These have such a geometry and are arranged so that air sucked from the annular channel 52 and in Direction to the discharge gap 44 is promoted when the bell cup 8 rotates in the operation of the rotary atomizer 2. In the annular channel 52, a negative pressure is formed, whereby the air surrounding the nozzle head 6, is sucked through the passageways 58 into the annular channel 52 and thus serves as a working fluid.
  • the rotary atomizer 2 described above now works as follows: During operation of the rotary atomizer 10, the bell cup 8 is rotated about its axis of rotation 18 by means of the drive device 20 and the paint feed channel 24 in the hollow shaft 22 is fed with lacquer.
  • lacquer first emerges from the dispensing opening 30 in the annular plate 28 of the rotating bell cup 8 and strikes its impact plate 32.
  • This lacquer due to the rotation of the bell cup 8, arrives as a lacquer film to its inside outflow surface 34 and further forward to its tear-off edge 36 where the paint film is thrown in the form of paint droplets.
  • This droplet formation is in FIG. 3 illustrated with larger droplets 62 and smaller droplets 64 shown.
  • the diameter of the paint mist generated by the nozzle head 6 is smaller than without the Laval ring nozzle 56 and the paint mist is focused on the object to be painted.
  • the guide sleeve 40 can be axially displaced relative to the bell cup 8 and fixed relative to the bell cup 8 and its outer circumferential surface 16 in different axial positions. In this way, the passage cross section of the narrowest point 54 of the annular channel 52 of the Laval ring nozzle 56 can be adjusted.
  • the passage cross section decreases at the narrowest point 54 of the annular channel 52 of the Laval ring nozzle 56.
  • the passage cross section of the annular channel 52 in the region of the conical portion 48 of the guide sleeve 40 decreases accordingly , The velocity of the air exiting the discharge slot 44 of the Laval annular nozzle 56 and the pressure surge thereon on the droplets 64 is then increased.
  • the guide vanes 60 may also be provided on the inner circumferential surface 38 of the guide sleeve 40 instead of on the outer circumferential surface 16 of the bell cup 8. Although the vanes 60 are then stationary, the desired effect is achieved due to the high rotational speed of the bell cup 8.
  • annular channel 52 of the Laval ring nozzle 56 can also be supplied with compressed air from a compressed air source via a compressed air line, which then serves as working fluid.
  • the guide vanes 60 can be dispensed with in this case.
  • the Laval ring nozzle 56 may also be provided as a separate component, which surrounds the bell cup 8 accordingly.
  • the outer circumferential surface 16 of the bell cup 8 does not form the second flow surface of the Laval annular nozzle; rather, this is then provided by the separate component.

Landscapes

  • Nozzles (AREA)
  • Electrostatic Spraying Apparatus (AREA)

Claims (9)

  1. Tête de buse dévolue à un atomiseur rotatif pour déposer un matériau de revêtement sur un objet, comportant un embout campaniforme (8) pouvant tourner autour d'un axe de rotation (18), et pourvu d'une surface d'écoulement (34) à laquelle du matériau de revêtement peut être délivré de façon telle que du matériau de revêtement soit propulsé par ledit embout campaniforme (8),
    caractérisée par le fait
    qu'une tuyère annulaire de Laval (56), ménagée sur l'embout campaniforme (8) avec symétrie de révolution par rapport à l'axe de rotation (18), est munie d'un interstice annulaire de distribution (44) à partir duquel un fluide de travail peut être projeté pneumatiquement sur le matériau de revêtement propulsé par ledit embout campaniforme (8).
  2. Tête de buse selon la revendication 1, caractérisée par le fait que la surface d'enveloppe extérieure (16) de l'embout campaniforme (8) est entourée par une surface d'enveloppe (38) d'un corps de guidage (40) qui est dotée d'une symétrie de révolution par rapport à l'axe de rotation (18), et donne naissance à la tuyère annulaire de Laval (56) en association avec ladite surface d'enveloppe extérieure (16) dudit embout campaniforme (8).
  3. Tête de buse selon la revendication 2, caractérisée par le fait que la surface d'enveloppe extérieure (16) de l'embout campaniforme (8) constitue une surface tronconique.
  4. Tête de buse selon la revendication 2 ou 3, caractérisée par le fait qu'un canal annulaire (52) est réservé entre la surface d'enveloppe extérieure (16) de l'embout campaniforme (8) et la surface d'enveloppe (38) du corps de guidage (40), laquelle surface d'enveloppe (38) est munie d'une protubérance (46) à symétrie de révolution qui pointe en direction de ladite surface d'enveloppe extérieure (16) dudit embout campaniforme (8), et préétablit la zone (54) la plus étroite dudit canal annulaire (52).
  5. Tête de buse selon l'une des revendications 2 à 4, caractérisée par le fait que la surface d'enveloppe extérieure (16) de l'embout campaniforme (8), ou la surface d'enveloppe (38) du corps de guidage (40), porte des pales directrices (60) agencées de manière à convoyer vers l'interstice annulaire de distribution (44) de la tuyère annulaire de Laval (56), lors de la rotation dudit embout campaniforme (8), du fluide de travail situé entre ladite surface d'enveloppe extérieure (16) dudit embout campaniforme (8) et ladite surface d'enveloppe (38) dudit corps de guidage (40).
  6. Tête de buse selon l'une des revendications 2 à 5, caractérisée par le fait que le corps de guidage (40) est pourvu d'un moins un canal de passage (58), par l'intermédiaire duquel du fluide peut affluer dans le canal annulaire (52) à partir de l'espace environnant.
  7. Tête de buse selon l'une des revendications 1 à 6, caractérisée par le fait que la section transversale de passage de la tuyère annulaire de Laval (56) peut être réglée, au moins au niveau de la zone (54) la plus étroite de cette dernière.
  8. Tête de buse selon la revendication 7 rattachée à la revendication 2, caractérisée par le fait que la position relative de l'embout campaniforme (8) et du corps de guidage (40) peut être réglée par rapport à l'axe de rotation (18) de celui-ci.
  9. Atomiseur rotatif pour déposer un matériau de revêtement sur un objet, et équipé d'une tête de buse (6),
    caractérisé par le fait que
    la tête de buse (6) est réalisée en conformité avec l'une des revendications 1 à 8.
EP11009306.9A 2010-12-01 2011-11-24 Tête de buse et pulvérisateur rotatif doté de celle-ci Not-in-force EP2460591B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102010053134A DE102010053134A1 (de) 2010-12-01 2010-12-01 Düsenkopf und Rotationszerstäuber mit einem solchen

Publications (2)

Publication Number Publication Date
EP2460591A1 EP2460591A1 (fr) 2012-06-06
EP2460591B1 true EP2460591B1 (fr) 2019-01-23

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EP11009306.9A Not-in-force EP2460591B1 (fr) 2010-12-01 2011-11-24 Tête de buse et pulvérisateur rotatif doté de celle-ci

Country Status (4)

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EP (1) EP2460591B1 (fr)
JP (1) JP6022760B2 (fr)
CN (1) CN102527535B (fr)
DE (1) DE102010053134A1 (fr)

Cited By (1)

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Publication number Priority date Publication date Assignee Title
US12090506B2 (en) 2020-07-14 2024-09-17 Techtronic Cordless Gp Powered sprayer

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DE102012010610A1 (de) 2012-05-30 2013-12-05 Eisenmann Ag Verfahren zum Betreiben eines Rotationszerstäubers, Düsenkopf und Rotationszerstäuber mit einem solchen
DE102014016364A1 (de) * 2014-11-05 2016-05-12 Eisenmann Se Reinigungsverfahren und Reinigungsvorrichtung für ein oder mehrere Teile eines Applikationssystems
KR101634298B1 (ko) * 2016-01-20 2016-06-30 박상은 더블 벨컵
CN106216119A (zh) * 2016-10-11 2016-12-14 韩振铎 一种电动高速旋转的液体离心雾化盘及雾化方法
CN112676052B (zh) * 2020-12-10 2022-04-12 哈尔滨工业大学 一种应用于高粘度涂料的涂料抛涂装置
CN113426224B (zh) * 2021-06-11 2022-11-15 华能国际电力股份有限公司上海石洞口第一电厂 一种用于输煤抑尘的含煤废水喷淋装置

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Publication number Priority date Publication date Assignee Title
US12090506B2 (en) 2020-07-14 2024-09-17 Techtronic Cordless Gp Powered sprayer

Also Published As

Publication number Publication date
DE102010053134A1 (de) 2012-06-06
CN102527535A (zh) 2012-07-04
CN102527535B (zh) 2017-03-01
JP6022760B2 (ja) 2016-11-09
EP2460591A1 (fr) 2012-06-06
JP2012115831A (ja) 2012-06-21

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