US3063642A - Rotating heads for electrostatic atomizing and spraying apparatus - Google Patents

Rotating heads for electrostatic atomizing and spraying apparatus Download PDF

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Publication number
US3063642A
US3063642A US16359A US1635960A US3063642A US 3063642 A US3063642 A US 3063642A US 16359 A US16359 A US 16359A US 1635960 A US1635960 A US 1635960A US 3063642 A US3063642 A US 3063642A
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US
United States
Prior art keywords
paint
head
hub
axis
atomizing
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.)
Expired - Lifetime
Application number
US16359A
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English (en)
Inventor
Point Marcel Auguste Roger
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.)
Machines Electrostatiques SA
Original Assignee
Sames Mach Electrostat
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Filing date
Publication date
Priority claimed from FR793247A external-priority patent/FR75634E/fr
Application filed by Sames Mach Electrostat filed Critical Sames Mach Electrostat
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Publication of US3063642A publication Critical patent/US3063642A/en
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
    • 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
    • B05B5/0403—Discharge apparatus, e.g. electrostatic spray guns characterised by having rotary outlet or deflecting elements, i.e. spraying being also effected by centrifugal forces characterised by the rotating member
    • B05B5/0407—Discharge apparatus, e.g. electrostatic spray guns characterised by having rotary outlet or deflecting elements, i.e. spraying being also effected by centrifugal forces characterised by the rotating member with a spraying edge, e.g. like a cup or a bell

Definitions

  • the present invention relates to improvements in rotating electrostatic heads for electrostatic atomizing and spraying apparatus, which comprise in particular a sharp edge for electric leakage and combine electrical atomizing with atomization by centrifugal force.
  • rotating electrostatic heads for electrostatic atomizing and spraying apparatus, which comprise in particular a sharp edge for electric leakage and combine electrical atomizing with atomization by centrifugal force.
  • such heads may be employed in stationary, movable or portable apparatus for coating objects, according to an electrostatic process, with fine particles of materials such as paints.
  • one factor is of prime importance. This is the regular and uniform feeding of paint, which is still in the liquid state in the electrostatic head, towards the spraying edge.
  • Reflections from the walls of the head must be carefully avoided, becausethey may create eddies in the circulation of the paint and these eddies may cause obstructions, particularly in the case when very heavy paints are utilised, such as red lead, oil paints or zinc oxide paints, etc. Eddies which are produced with such paints may create zones where there is no circulation and Where a sedimentation of the paint will be produced, which will impede or may even block the flow of paint towards the atomizing edge.
  • the invention has for its object to provide improvements in electrostatic heads by means of which a regular and progressive supply of paint towards the atomizing edge is ensured.
  • FIGURE 1 shows a front view of one embodiment of an improved electrostatic head according to the invention.
  • FIGURE 2 is a longitudinal section along XOY of FIG- URE 1.
  • FIGURES 3 and 4 are sections, which are similar to that of FIGURE 2, of modified embodiments.
  • the head 1 which preferably has a cylindrical shape, comprises a central part or hub 2, at the centre of which is a housing 2 by means of which the head 1 can be attached to a member (not shown) which imparts to it its rotary movement about its axis.
  • the external surface of the hub comprises several successive surfaces, flaring progressively relative to the direction of feeding of the paint, in order to terminate in wide apertures through which said paint flows towards the atomizing edge.
  • FIGURE 2 only two such surfaces 2a, 2b are shown externally of the hub and in FIGURE 1 only four such 3,063,642 Patented Nov. 13, 1962 apertures are shown, but it is obvious that the numbers indicated are in no Way intended to be limiting.
  • these apertures 3, 4, 5, 6 are inwardly curved, in the arc of a circle about the axis of rotation O of the head.
  • these apertures have a relatively small radial width in the upstream portion and flare towards the downstream portion in the direction of flow of the paint. In this manner, circulation towards the atomizing edge is facilitated through the effect of centrifugal force.
  • the upstream inlet of these apertures is in communication with the paint feed channel 7 which, owing to the shape of the external surface of the hub 2, offers a minimum of resistance to the flow of paint and moreover ensures a regular feeding of the paint. No eddies due to reflections of the paint can be created at any point of this circulation path and thus the above mentioned drawbacks are avoided.
  • the head which may be made of metal or of a high resistivity material, has given excellent results during tests.
  • the head is constituted by a high resistivity material comprising parts by weight of a thermosetting resin of the ethoxyline or epoxid type and 3 parts of lamp-black, but the invention is obviously not limited to this example which is given simply by way of illustration. This is also true of the geometrical shape of the apertures 3 to 6.
  • the head comprises a substantially hollow cylindrical external part 11 which is fixed to the hub 12, whose external surface also comprises several successive surfaces 12a, 12b, flaring progressively relative to the direction of paint feed.
  • the driving shaft for rotating the head is shown at 13.
  • the paint is fed through a nozzle 14 which is directed in such a manner that the paint jet leaving the nozzle makes a very obtuse angle with one of the external surfaces of the hub 12. arrives very obliquely on these walls and this prevents any reflection of the paint jet on any wall of the head. Therefore, the liquid advances regularly towards the apertures 15 provided between the hub and the external part 11 of the head and thereafter towards the atomizing edge.
  • this nozzle is advantageously pro vided with an ejector 16, which cooperates in directing the jet of liquid very obliquely on to the external flared surface of the hub 2 and which moreover prevents a moistening of the paint inflow pipe and consequently avoids a back-flow of the paint.
  • the inlet nozzle 14 is shown substantially parallel to the longitudinal axis of the head, but ohviously, it could also be slightly inclined relative to this axis.
  • the important condition to be fulfilled is that the paint is fed very obliquely on to the external wall of the hub 12, without being subjected to a sudden variation of direction and without reflection on any wall of the head.
  • FIGURE 4 shows a modification, similar to that of FIGURE 3, which is particularly suitable for heads intended to supply a large output of paint.
  • the external part 17 of the head instead of being cylindrical like the part 11 of FIGURE 3, has a slightly truncated cone shape. This shape combined with the external surface of the previously described hub 12, enables a film of liquid to be obtained which is thinner than in cylindrical heads and avoids any accumulation of paint inside the head.
  • a rotary head for electrostatic atomizing and spraying of a fluid and combining electrical atomizing with Therefore, the liquid apeaeea atomization by centrifugal force comprising a body portion having an edge for electric leakage, a hub within said body portion and surrounded by apertures, said hub comprising plural successive external surfaces which progressively flare outwardly towards said body portion at increasing angles with respect to the axis of rotation of the head and which are all inclined at an obtuse angle with respect to said axis of rotation, means for directing the fluid to be sprayed on to that one of those external surfaces adjacent the axis of rotation of the head in a direction substantially parallel to the axis of rotation of said head, at least one external surface of the hub serving as a centrifugal gradient to feed said fluid progressively and without sudden variations in direction towards the apertures through which it passes to the atomizing edge, and said apertures being arcuately curved and circularly disposed about the axis of rotation of the head and having a relatively small
  • a rotary head for electrostatic atomizing and spraying of a fluid and combining electrical atomizing with atomization by centrifugal force comprising a body portion having an edge for electric leakage, a hub within said body portion and surrounded by apertures, said hub comprising plural successive external surfaces which progressive'ly flare outwardly towards said body portion at increasing angles with respect to the axis of rotation of the head and which are all inclined at an obtuse angle with respect to said axis of rotation, a fluid inlet nozzle for directing the fluid to be sprayed on to that one of those external surfaces adjacent the axis of rotation of the head in a direction substantially parallel to the axis of rotation of said head, at least one external surface of the hub serving as a centrifugal gradient to feed said fluid progressively and without sudden variations in direction towards the apertures through which it passes to the atomizing edge, and an ejector provided at the end of the fluid inlet nozzle, said ejector including means in order to avoid said hub portion comprising at least two
  • a rotary generally cylindrical head member having an edge for electrical leakage, a hub within said head member comprising several successive external surfaces which progressively flare outwardly relative to the direction of feed of the paint jet, said jet being directed on to that one of those surfaces adjacent the axis of rotation of the head at a substantially obtuse angle, at least one surface of the hub serving to feed this paint regularly towards apertures which finally feed it to the atomizing edge, whereby any sudden variation of direction of the paint and any reflection of the paint on any wall of the head is substantially avoided and said apertures being arcuately curved and circularly disposed about the axis of rotation of the head and having a relatively small radial width in the upstream portion and flaring towards the downstream portion in the direction of flow of the paint.

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  • Electrostatic Spraying Apparatus (AREA)
  • Medicinal Preparation (AREA)
US16359A 1959-03-31 1960-03-21 Rotating heads for electrostatic atomizing and spraying apparatus Expired - Lifetime US3063642A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR790762A FR75411E (fr) 1959-03-31 1959-03-31 Appareil pour pulvérisation et projection électrostatiques
FR793247A FR75634E (fr) 1959-04-27 1959-04-27 Appareil pour pulvérisation et projection électrostatiques
FR808194A FR76467E (fr) 1959-03-31 1959-10-22 Appareil pour pulvérisation et projection électrostatiques

Publications (1)

Publication Number Publication Date
US3063642A true US3063642A (en) 1962-11-13

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US16359A Expired - Lifetime US3063642A (en) 1959-03-31 1960-03-21 Rotating heads for electrostatic atomizing and spraying apparatus
US24159A Expired - Lifetime US3072341A (en) 1959-03-31 1960-04-22 Spray head for electrostatic spraying apparatus

Family Applications After (1)

Application Number Title Priority Date Filing Date
US24159A Expired - Lifetime US3072341A (en) 1959-03-31 1960-04-22 Spray head for electrostatic spraying apparatus

Country Status (6)

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US (2) US3063642A (xx)
BE (1) BE588913A (xx)
CH (2) CH365979A (xx)
FR (4) FR1110350A (xx)
GB (2) GB917683A (xx)
NL (2) NL249797A (xx)

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3144209A (en) * 1961-10-20 1964-08-11 Westinghouse Electric Corp Rotatable spray apparatus
US3148832A (en) * 1961-06-23 1964-09-15 Sames Mach Electrostat Liquid spray coating device
US3178114A (en) * 1960-11-02 1965-04-13 Sames Mach Electrostat Rotary atomising heads for electrostatic spray guns
US3219013A (en) * 1962-05-04 1965-11-23 Gen Motors Corp Precharging device for electrostatic painting apparatus
US3463120A (en) * 1966-05-26 1969-08-26 Aerocoat Sa Apparatus for applying powder coatings to articles
EP0032391A1 (de) * 1980-01-15 1981-07-22 Behr, Hans Einrichtung zum Vernebeln flüssiger Farbe
US4323197A (en) * 1980-02-18 1982-04-06 Toyota Jidosha Kogyo Kabushiki Kaisha Rotary type electrostatic spray painting device
US4350304A (en) * 1980-04-04 1982-09-21 Toyota Jidosha Kogyo Kabushiki Kaisha Rotary type electrostatic spray painting device
US4351482A (en) * 1980-05-26 1982-09-28 Toyota Jidosha Kogyo Kabushiki Kaisha Rotary type electrostatic spray painting device
US4361288A (en) * 1980-04-04 1982-11-30 Toyota Jidosha Kogyo Kabushiki Kaisha Rotating speed detecting device of a rotary type electrostatic spray painting device
US4361287A (en) * 1980-04-04 1982-11-30 Toyota Jidosha Kogyo Kabushiki Kaisha Rotary type electrostatic spray painting device
US4365760A (en) * 1980-05-23 1982-12-28 Toyota Jidosha Kogyo Kabushiki Kaisha Rotary type electrostatic spray painting device
US4365759A (en) * 1980-05-21 1982-12-28 Toyota Jidosha Kogyo Kabushiki Kaisha Rotary type electrostatic spray painting device
US4369924A (en) * 1980-04-04 1983-01-25 Toyota Jidosha Kogyo Kabushiki Kaisha Rotary type electrostatic spray painting device
US4369925A (en) * 1980-05-21 1983-01-25 Toyota Jidosha Kogyo Kabushiki Kaisha Rotary type electrostatic spray painting device
US4373673A (en) * 1980-02-19 1983-02-15 Toyota Jidosha Kogyo Kabushiki Kaisha Rotary type electrostatic spray painting device
US4378091A (en) * 1980-05-21 1983-03-29 Toyota Jidosha Kabushiki Kaisha Rotary type electrostatic spray painting device
US4384682A (en) * 1980-05-23 1983-05-24 Toyota Jidosha Kabushiki Kaisha Rotary type electrostatic spray painting device
US4467968A (en) * 1981-03-04 1984-08-28 Toyota Jidosha Kogyo Kabushiki Kaisha Rotary type electrostatic spray painting device
US4684064A (en) * 1985-08-19 1987-08-04 Graco Inc. Centrifugal atomizer
US4739935A (en) * 1986-03-12 1988-04-26 Nordson Corporation Flexible voltage cable for electrostatic spray gun
US20090008469A1 (en) * 2007-07-03 2009-01-08 Illinois Tool Works Inc. Spray device having a parabolic flow surface

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3055592A (en) * 1956-12-17 1962-09-25 Ransburg Electro Coating Corp Liquid atomizing apparatus
FR1110350A (fr) * 1959-03-31 1956-02-10 Sames Mach Electrostat Appareil pour pulvérisation et projection électrostatiques
US3121533A (en) * 1961-04-12 1964-02-18 Jr John Sedlacsik Electrostatic atomizing head
US3120736A (en) * 1961-05-29 1964-02-11 Cosmic Inc Method and apparatus for colloidal propulsion
US3224680A (en) * 1964-06-11 1965-12-21 Ford Motor Co Atomizing apparatus having a liquid accumulation cavity
US3641971A (en) * 1967-09-01 1972-02-15 Arvid C Walberg Apparatus for preventing arcing in an electrostatic coating system
SE386841B (sv) * 1973-04-19 1976-08-23 Atlas Copco Ab Elektrostatisk fergspruta
SE392575B (sv) * 1973-10-04 1977-04-04 Atlas Copco Ab Elektrostatisk fergspruta
DE2713328A1 (de) * 1977-03-25 1978-10-05 Gema Ag Vorrichtung zum elektrostatischen auftragen von beschichtungsmaterial auf gegenstaende
US4398672A (en) * 1980-03-20 1983-08-16 National Research Development Corporation Electrostatic spraying
FR2483263A1 (fr) * 1980-05-27 1981-12-04 Marchand Bernard Tete atomisante rotative pour appareils d'application, par voie electrostatique, de produits liquides, tels que, notamment, peintures et vernis
US4489894A (en) * 1981-02-27 1984-12-25 National Research Development Corporation Inductively charged spraying apparatus
DE3478202D1 (en) * 1983-01-06 1989-06-22 Nat Res Dev Electrostatic spray head
GB8305865D0 (en) * 1983-03-03 1983-04-07 British Res Agricult Eng Electrostatic sprayers
WO1996031286A1 (fr) * 1995-04-06 1996-10-10 Abb Industry K.K. Dispositif pour peindre du type presentant une tete de pulverisation rotative
JP3726329B2 (ja) * 1996-02-16 2005-12-14 トヨタ自動車株式会社 回転霧化静電塗装機のベルヘッドおよび回転霧化静電塗装機
US6003785A (en) * 1997-05-27 1999-12-21 Sames Electrostatic, Inc. Composite material bell cup
US6076751A (en) * 1998-12-15 2000-06-20 Illinois Tool Works Inc. Method of charging using nonincendive rotary atomizer

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1110350A (fr) * 1959-03-31 1956-02-10 Sames Mach Electrostat Appareil pour pulvérisation et projection électrostatiques
US2926106A (en) * 1956-07-16 1960-02-23 Ransburg Electro Coating Corp Apparatus and methods for electrostatic coating utilizing an inner electrode to substantially reduce the central void of the annular spray pattern

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2352252A (en) * 1941-10-31 1944-06-27 Westinghouse Air Brake Co Sanding control means
US2658009A (en) * 1948-05-13 1953-11-03 Ransburg Electro Coating Corp Electrostatic coating method and apparatus
US2781279A (en) * 1951-11-26 1957-02-12 Ransburg Electro Coating Corp Method and apparatus for spray coating of articles
US2901177A (en) * 1956-08-30 1959-08-25 Edward O Norris Spraying apparatus

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2926106A (en) * 1956-07-16 1960-02-23 Ransburg Electro Coating Corp Apparatus and methods for electrostatic coating utilizing an inner electrode to substantially reduce the central void of the annular spray pattern
FR1110350A (fr) * 1959-03-31 1956-02-10 Sames Mach Electrostat Appareil pour pulvérisation et projection électrostatiques

Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3178114A (en) * 1960-11-02 1965-04-13 Sames Mach Electrostat Rotary atomising heads for electrostatic spray guns
US3148832A (en) * 1961-06-23 1964-09-15 Sames Mach Electrostat Liquid spray coating device
US3144209A (en) * 1961-10-20 1964-08-11 Westinghouse Electric Corp Rotatable spray apparatus
US3219013A (en) * 1962-05-04 1965-11-23 Gen Motors Corp Precharging device for electrostatic painting apparatus
US3463120A (en) * 1966-05-26 1969-08-26 Aerocoat Sa Apparatus for applying powder coatings to articles
EP0032391B1 (de) * 1980-01-15 1984-04-18 Behr, Hans Einrichtung zum Vernebeln flüssiger Farbe
EP0032391A1 (de) * 1980-01-15 1981-07-22 Behr, Hans Einrichtung zum Vernebeln flüssiger Farbe
US4323197A (en) * 1980-02-18 1982-04-06 Toyota Jidosha Kogyo Kabushiki Kaisha Rotary type electrostatic spray painting device
US4373673A (en) * 1980-02-19 1983-02-15 Toyota Jidosha Kogyo Kabushiki Kaisha Rotary type electrostatic spray painting device
US4369924A (en) * 1980-04-04 1983-01-25 Toyota Jidosha Kogyo Kabushiki Kaisha Rotary type electrostatic spray painting device
US4361288A (en) * 1980-04-04 1982-11-30 Toyota Jidosha Kogyo Kabushiki Kaisha Rotating speed detecting device of a rotary type electrostatic spray painting device
US4361287A (en) * 1980-04-04 1982-11-30 Toyota Jidosha Kogyo Kabushiki Kaisha Rotary type electrostatic spray painting device
US4350304A (en) * 1980-04-04 1982-09-21 Toyota Jidosha Kogyo Kabushiki Kaisha Rotary type electrostatic spray painting device
US4378091A (en) * 1980-05-21 1983-03-29 Toyota Jidosha Kabushiki Kaisha Rotary type electrostatic spray painting device
US4369925A (en) * 1980-05-21 1983-01-25 Toyota Jidosha Kogyo Kabushiki Kaisha Rotary type electrostatic spray painting device
US4365759A (en) * 1980-05-21 1982-12-28 Toyota Jidosha Kogyo Kabushiki Kaisha Rotary type electrostatic spray painting device
US4384682A (en) * 1980-05-23 1983-05-24 Toyota Jidosha Kabushiki Kaisha Rotary type electrostatic spray painting device
US4365760A (en) * 1980-05-23 1982-12-28 Toyota Jidosha Kogyo Kabushiki Kaisha Rotary type electrostatic spray painting device
US4351482A (en) * 1980-05-26 1982-09-28 Toyota Jidosha Kogyo Kabushiki Kaisha Rotary type electrostatic spray painting device
US4467968A (en) * 1981-03-04 1984-08-28 Toyota Jidosha Kogyo Kabushiki Kaisha Rotary type electrostatic spray painting device
US4684064A (en) * 1985-08-19 1987-08-04 Graco Inc. Centrifugal atomizer
US4739935A (en) * 1986-03-12 1988-04-26 Nordson Corporation Flexible voltage cable for electrostatic spray gun
US20090008469A1 (en) * 2007-07-03 2009-01-08 Illinois Tool Works Inc. Spray device having a parabolic flow surface
US8602326B2 (en) 2007-07-03 2013-12-10 David M. Seitz Spray device having a parabolic flow surface

Also Published As

Publication number Publication date
BE588913A (fr) 1960-07-18
GB932998A (en) 1963-07-31
GB917683A (en) 1963-02-06
US3072341A (en) 1963-01-08
NL249797A (xx) 1964-04-10
FR76467E (fr) 1961-10-20
NL250890A (xx) 1964-02-25
FR76165E (fr) 1961-09-22
FR75411E (fr) 1961-06-09
CH362945A (fr) 1962-06-30
FR1110350A (fr) 1956-02-10
CH365979A (fr) 1962-11-30

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