EP0574305B1 - Dispositif de projection électrostatique d'un produit de revêtement en poudre à tête d'ionisation tournante - Google Patents

Dispositif de projection électrostatique d'un produit de revêtement en poudre à tête d'ionisation tournante Download PDF

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Publication number
EP0574305B1
EP0574305B1 EP93401461A EP93401461A EP0574305B1 EP 0574305 B1 EP0574305 B1 EP 0574305B1 EP 93401461 A EP93401461 A EP 93401461A EP 93401461 A EP93401461 A EP 93401461A EP 0574305 B1 EP0574305 B1 EP 0574305B1
Authority
EP
European Patent Office
Prior art keywords
deflector
ionisation
head
bowl
air
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
EP93401461A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0574305A1 (fr
Inventor
Pierre Chabert
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.)
Sames Kremlin SAS
Original Assignee
Sames SA
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 Sames SA filed Critical Sames SA
Publication of EP0574305A1 publication Critical patent/EP0574305A1/fr
Application granted granted Critical
Publication of EP0574305B1 publication Critical patent/EP0574305B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B05B5/053—Arrangements for supplying power, e.g. charging power
    • B05B5/0533—Electrodes specially adapted therefor; Arrangements of electrodes
    • 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
    • B05B3/1064—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, i.e. the spraying being effected by centrifugal forces the liquid or other fluent material to be sprayed being axially supplied to the rotating member through a hollow rotating shaft
    • 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
    • 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
    • B05B5/0418—Discharge apparatus, e.g. electrostatic spray guns characterised by having rotary outlet or deflecting elements, i.e. spraying being also effected by centrifugal forces designed for spraying particulate material
    • 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
    • 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

Definitions

  • the invention relates to a device for electrostatic projection of a powder coating product such as for example a hot-melt paint and relates more particularly to an improvement of the electrostatic charging means of the powder, making it possible to obtain a broad impact on the object. and excellent homogeneity of the deposit over the entire width of said impact.
  • a powder coating product such as for example a hot-melt paint
  • the invention also makes it possible to improve the deposition yield, compared with what is obtained with conventional devices.
  • the invention relates to a device for electrostatic projection of a powder coating product for covering objects, comprising a supply channel for an air-powder mixture opening axially at the bottom of an ionization head for creating an electric ionization field capable of charging said coating product by ion bombardment, this ionization head comprising an element generally in the form of bowl and comprising at least one rotating part, said ionization head comprising a deflector arranged coaxially in front of the orifice of said channel and spaced from said bowl-shaped element, characterized in that it further comprises a counter electrode, arranged axially set back relative to said ionization head and in that said deflector extends to the periphery of said bowl-shaped element so as to define with it an annular ejection outlet for the air mixture -powder, the edge of this deflector, located near the edge of said bowl-shaped element constituting or carrying a charging electrode.
  • the above-mentioned rotating part can be the generally bowl-shaped element or the deflector. It is preferable that the rotating part is that which more particularly constitutes the electrode, that is to say here the deflector. However, in a simple and effective way, it is the whole of the ionization head (that is to say the bowl-shaped element and the deflector) which is mounted rotating around a longitudinal axis combined with that of said feed channel opening at the bottom of the ionization head. In this case, said deflector is fixed to said bowl-shaped element by bracing means.
  • the bowl-shaped element is generally made of insulating material.
  • the deflector may be of conductive material and in this case it has a sharp edge at its outer periphery so that an ionized electric field can be established between this edge and the counter-electrode.
  • the field lines "wrap" the annular ejection outlet of the air-powder mixture so that the powder particles are more effectively charged by ions emitted by the electrode.
  • the deflector may also be made of insulating material.
  • conductive elements are embedded inside the deflector and emerge in the form of points at the periphery of the latter. It is enough to provide a sufficient number of spikes regularly arranged at the periphery of the deflector so that the electric ionization field can be established between these different points brought to a high voltage and the counter-electrode, the operation being the same as with an electrode constituted by the whole of the deflector in conductive material.
  • the electrostatic projection device shown in Figure 1 mainly consists of a body 11, generally cylindrical, provided with an axial recess 12 housing a supply channel 13 of an air-powder mixture and a turbine 14 with pneumatic drive arranged around this channel.
  • the output shaft 15, in the form of a sleeve, of this turbine protrudes beyond a front face of the body 11 and carries an ionization head 16 which will be described in detail below.
  • the body 11 is extended by a rear element 18 also made of insulating material, shaped to engage in the recess 12 over a certain axial distance to the rear of the turbine.
  • This element carries a connection end piece 20, for the air-powder mixture, a high voltage connector 22 intended to be connected, by an electric cable 22 a , to a high voltage source, a compressed air connection end piece 24 , in particular for supplying the turbine and a ground connector 28, intended to be connected to earth by an electric cable 28 a .
  • the feed channel 13 is materialized by a conduit 13a, rigid, integral with the rear element 18 and communicating with the nozzle 20. This duct extends axially in a sleeve 29 forming the support of the turbine 14. This sleeve is axially screwed into the element 18 and extends into the recess 12 of the body 11.
  • the conduit 13 a protrudes from the body 11 beyond its front face above, which is capped by a cap 30 screwed onto a external thread of said body.
  • the rotor 32 of the turbine carrying the blades 33 is mounted rotating on the sleeve 29 by two axially spaced ball bearings 34.
  • the high voltage is applied to the ionization head via a contact element 35, a resistor 36 (82 M ⁇ ) limiting the current and the components of the turbine 14, made of conductive material.
  • the electrical connection between the resistor 36 and the turbine is ensured by a metal spring 37 compressed between one end of the resistor and an annular contact piece 38 interposed between the element 18 and the turbine 14.
  • Between the front face of the body 11 and the cap 30 are defined annular chambers supplied with compressed air.
  • An annular chamber 40 is located in the immediate vicinity of the shaft 15 and the air escapes through the annular clearance defined between the cap 30 and the shaft 15 ensuring permanent cleaning of the latter.
  • Another annular chamber 42 feeds drive air ejection channels 43, the orifices of which are arranged coaxially and behind the ionization head 16, towards the periphery thereof to create a current of air entraining the air-powder mixture towards the object to be covered.
  • a cylindrical, annular counter-electrode 45 is housed in an annular cavity defined between the body 11 and the cap 30. It is arranged axially set back relative to the ionization head.
  • This counter-electrode, with a porous structure, is placed over a groove 46 formed in the body 11 and supplied with compressed air. The air escapes radially through holes 47 of the cap 30, regularly arranged circumferentially. Thus, the ions collected by the counter-electrode pass through the holes 47 but the air which escapes from it prevents the powder from accumulating on this counter-electrode.
  • the latter is connected to earth by conductive elements such as, in the example shown, a metal spring 48, a metal ball 49, another metal spring 50, a resistor 51 (500 M ⁇ ), connector 28 and power cable 28 a . Holes are made in the body 11 to supply the chambers 40 and 42 and the groove 46.
  • the ionization head comprises a generally bowl-shaped element 56, here made of insulating material and a deflector 58, here made of metal.
  • the element 56 comprises a tubular hub 57 screwed into the shaft 15 of the turbine.
  • the conduit 13 a is engaged in the axial recess of the hub 57, without contact with it, and opens at the bottom of the element 56 in the form of a bowl.
  • the deflector 58 is arranged coaxially at the front of the orifice of the channel 13 while being spaced from the element 56 by bracing means 60.
  • the deflector extends radially up to the periphery of the shaped element bowl 56 so as to define with it an annular ejection outlet 62 for the air-powder mixture.
  • the edge of the deflector 58 constitutes a charging electrode.
  • the edge of the deflector 58 has a sharp edge 58 a at its external periphery.
  • the deflector being integral with the bowl-shaped element 56, it is the assembly of the ionization head which is rotated by the turbine.
  • the bracing means 60 and in particular the screws 64, metallic, which make it possible to connect the deflector 58 to the high voltage. More specifically, the screws 64 pass through the bowl-shaped element 56 and are screwed into a metal ring 66 in electrical contact with the end of the shaft 15 of the turbine.
  • the deflector 68 is made of insulating material in which, during molding, conductive elements 70, 72 are electrically connected to the screws 64 of the bracing means.
  • each point emerges inside a small crater 74 hollowed out in the peripheral edge of the deflector. So defined, the deflector 68 can replace the deflector 58 of FIG. 1.
  • the air-powder mixture circulating in the axial channel 13 strikes the rotating deflector and engages in the space defined between the bowl-shaped element 56 and the internal wall of the deflector, up to the annular outlet. 62. On leaving, the powder particles are charged by bombardment of ions emitted by the deflector forming an electrode.
  • the ions emitted by the charging electrode can follow two paths. Part of the ions go to the counter electrode and the other part to the object to be covered. The presence of the counter-electrode makes it possible to obtain a good charge of the powder while limiting the current towards the object.
  • the ion current which is established between the electrode and the counter-electrode is equal to approximately four times the charge carried by the powder and four times the ion current which s' establishes between the deflector and the object to be covered. It is estimated that the rotation of the ionization head makes it possible to better homogenize the air-powder mixture at the outlet 62 and thus to promote better loading of the powder particles.

Landscapes

  • Electrostatic Spraying Apparatus (AREA)
EP93401461A 1992-06-10 1993-06-09 Dispositif de projection électrostatique d'un produit de revêtement en poudre à tête d'ionisation tournante Expired - Lifetime EP0574305B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR929206962A FR2692173B1 (fr) 1992-06-10 1992-06-10 Dispositif de projection électrostatique d'un produit de revêtement en poudre à tête d'ionisation tournante.
FR9206962 1992-06-10

Publications (2)

Publication Number Publication Date
EP0574305A1 EP0574305A1 (fr) 1993-12-15
EP0574305B1 true EP0574305B1 (fr) 1997-04-23

Family

ID=9430564

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93401461A Expired - Lifetime EP0574305B1 (fr) 1992-06-10 1993-06-09 Dispositif de projection électrostatique d'un produit de revêtement en poudre à tête d'ionisation tournante

Country Status (7)

Country Link
US (1) US5353995A (es)
EP (1) EP0574305B1 (es)
JP (1) JP3291503B2 (es)
CA (1) CA2098050C (es)
DE (1) DE69310026T2 (es)
ES (1) ES2101257T3 (es)
FR (1) FR2692173B1 (es)

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Also Published As

Publication number Publication date
DE69310026D1 (de) 1997-05-28
DE69310026T2 (de) 1997-08-21
FR2692173A1 (fr) 1993-12-17
US5353995A (en) 1994-10-11
CA2098050C (fr) 2005-07-26
CA2098050A1 (fr) 1993-12-11
EP0574305A1 (fr) 1993-12-15
ES2101257T3 (es) 1997-07-01
JP3291503B2 (ja) 2002-06-10
JPH0655105A (ja) 1994-03-01
FR2692173B1 (fr) 1994-09-02

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