EP0630690B1 - Pneumatischer Flachstrahlzerstauber zum Versprühen von Beschichtungsmaterialien - Google Patents

Pneumatischer Flachstrahlzerstauber zum Versprühen von Beschichtungsmaterialien Download PDF

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Publication number
EP0630690B1
EP0630690B1 EP19940401327 EP94401327A EP0630690B1 EP 0630690 B1 EP0630690 B1 EP 0630690B1 EP 19940401327 EP19940401327 EP 19940401327 EP 94401327 A EP94401327 A EP 94401327A EP 0630690 B1 EP0630690 B1 EP 0630690B1
Authority
EP
European Patent Office
Prior art keywords
paint
insert
spray device
stream
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
EP19940401327
Other languages
English (en)
French (fr)
Other versions
EP0630690A1 (de
Inventor
Michel Cappeau
Gérard Degli
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
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Filing date
Publication date
Application filed by Sames SA filed Critical Sames SA
Publication of EP0630690A1 publication Critical patent/EP0630690A1/de
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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
    • B05B5/03—Discharge apparatus, e.g. electrostatic spray guns characterised by the use of gas, e.g. electrostatically assisted pneumatic spraying
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/02—Spray pistols; Apparatus for discharge
    • B05B7/06—Spray pistols; Apparatus for discharge with at least one outlet orifice surrounding another approximately in the same plane
    • B05B7/062—Spray pistols; Apparatus for discharge with at least one outlet orifice surrounding another approximately in the same plane with only one liquid outlet and at least one gas outlet
    • B05B7/066—Spray pistols; Apparatus for discharge with at least one outlet orifice surrounding another approximately in the same plane with only one liquid outlet and at least one gas outlet with an inner liquid outlet surrounded by at least one annular gas outlet
    • B05B7/067—Spray pistols; Apparatus for discharge with at least one outlet orifice surrounding another approximately in the same plane with only one liquid outlet and at least one gas outlet with an inner liquid outlet surrounded by at least one annular gas outlet the liquid outlet being annular

Definitions

  • the invention relates to a pneumatic sprayer for a flat jet coating product. More specifically, it relates to a sprayer with a high flow rate and a low pressure of atomizing air, usually referred to as "H.V.L.P.”.
  • horns projecting from the front face of the spray cap: they make it possible to subject the spray of sprayed paint leaving the sprayer to the action of several air jets which crush it. We are talking about conformation of the jet.
  • the paint spray is cut in half and there is no more paint in the central part of the spray: the spray obtained is no longer a flat spray but the combination of two more or less ovoid jets. The thickness of the coating obtained on the object to be covered is then irregular, which is unacceptable.
  • a conventional pneumatic sprayer uses a source of compressed air to drive the paint stream into an area where it is sprayed.
  • a second source of compressed air is used to spray, that is to say divide into a multitude of droplets, the paint stream at the outlet of the spray orifice.
  • spray air The drive air and the spray air may have a common source; they are then separated by channels inside the spray cap.
  • the drive air also constitutes the spray air. Its pressure at the rear of the spray cap is relatively low, preferably less than 1 bar.
  • the paint stream must be entrained and sheared by this air jet: the paint particles located in the center of the stream are not subjected to the shear action of the spray air. It is therefore sometimes necessary to increase the pressure of the atomizing air, which limits the advantages of the HVLP configuration. Low pollution, low paint loss and high deposition efficiency obtained with a sprayer of this type come essentially from the low pressure of the spray air and of the shaping air.
  • the more or less hollow character of the vein depends on the degree of opening of the valve, which is prohibitive because the efficiency of the conformation then also depends on the opening of the valve, that is to say on the spray rate.
  • the adjustment of such a sprayer is particularly delicate.
  • the position of the needle relative to the seat of the valve alone conditions the profile of the vein of coating product: if the needle is not exactly centered on the seat, the hollow vein obtained is not cylindrical. This asymmetry is necessarily found in the flat jet finally obtained.
  • the invention solves all of these problems.
  • a pneumatic sprayer of coating product with flat jet comprising a valve for supplying coating product delivering a paint stream and a spray nozzle characterized in that an insert comprising an annular channel is housed in the nozzle downstream of the valve needle and transforms said vein into a hollow spray of paint.
  • the hollow character of the vein is obtained independently of the adjustment of the flow rate of coating product and of its physical characteristics.
  • the centering of the needle on the valve seat does not condition the symmetry of the coating product.
  • the relatively large electrical capacity that constitutes the metal needle can be housed deep enough in the body of the sprayer to avoid any risk of sparks.
  • the sprayer 1 of FIG. 1 is of the HVLP type. It includes a paint inlet channel 2 supplied by a conduit 3 penetrating into the sprayer through the butt 4.
  • the trigger 5 makes it possible to control a valve 6 whose needle 7 rests on a seat 8 near the spray orifice 9 formed in a spray nozzle 10.
  • An air supply duct 11 also enters the butt 4. It makes it possible to supply, through ducts 12 and 12 'The sprayer 1 in drive air and spray on the one hand and in horn or conformation air on the other hand.
  • the horns 13a and 13b include orifices 14a, 15a, 14b and 15b of exit of conformation air directed towards the paint stream leaving the sprayer through the orifice 8. These horns form part of a spray cap 16 held in place place on the nozzle 10 by a clamping nut 17.
  • an insert 20 for example of plastic material, transforming the paint stream into a hollow paint stream.
  • This insert is housed in the nozzle 10 near the spray orifice. It in fact constitutes the terminal part of the paint channel in the nozzle 10.
  • the insert 20 is visible in Figure 2. It has four inlet channels 21 regularly distributed on the side of the seat 8 and the needle 7 of the paint supply valve and an annular outlet channel 22 constituting the orifice spray. Channels 21 and channel 22 are in communication.
  • the insert 20 has an axial bore 25 in which is housed a charging electrode 26 supplied in a manner known per se from a high-voltage generator not shown.
  • the electrode 26 protrudes from the insert 20 over a sufficient length L so that it charges the vein of paint both by contact and by Corona discharge.
  • the operation is as follows: after passing through the pipe 3 and the pipe 2, the paint passes between the needle 7 and the seat 8 of the supply valve. It is then divided into four threads by the four conduits 21, which are joined in the channel 22 to form a single jet which is kept hollow up to the spray orifice 9 thanks to the central internal part 27.
  • the presence of the central part 27 to the end of the insert 20 prevents the paint stream from becoming a full stream before the spray air begins to shear and entrain it and before the shaping air doesn't start to overwrite it. It is then possible to use spray air and conformation air at a relatively low pressure to entrain and flatten this paint stream.
  • the charging electrode 26 If the charging electrode 26 is long enough, the crushing begins at the end of the latter and it is in direct contact with the paint stream, which leads to charging by contact. Otherwise, the electrode charges the paint stream with Corona discharge because its end is close to the paint stream being sprayed.
  • FIG. 3 relates to an insert 120 including a modification of the geometry of the central part 27 of FIG. 2: it is referenced 127. It has a frustoconical end 128 which deflects the paint stream. The paint therefore has a radial velocity component when it meets the spraying air which is substantially parallel to the axis of the insert 120. In this way, the penetration of air into the paint stream is further facilitated and the pressure of the spraying air can be kept at a minimum value.
  • the insert can also be metallic or made of a conductive material.
  • the electrode 26 is then removed and the coating product is charged by contact when it passes through the channels 21 and 22 and / or by Corona discharge on the edges of the insert 20 or 120.
  • This insert can also be produced by ceramic, which gives it a longer life because of the hardness of this material.

Claims (8)

  1. Pneumatischer Flachstrahlzerstäuber für Beschichtungsmaterial mit einem Versorgungsventil für Beschichtungsmaterial (6), das einen Farbenstrom liefert, einer Zerstäuberdüse (10) und Luftkanälen (14,15) zur Formbildung, die zu dem aus der Düse austretenden Farbenstrom gerichtet ist,
    dadurch gekennzeichnet,
    daß in der Düse stromaufwärts zur Nadel (7) des Ventils ein einen Ringkanal (22) umfassender Einsatz (20,120) angeordnet ist, der den Strom in einen hohlen Farbenstrahl umwandelt.
  2. Zerstäuber nach Anspruch 1, dadurch gekennzeichnet, daß der Zerstäuber des Typs einer großen Durchströmmenge und eines niedrigen Zerstäubungsluftdrucks ist.
  3. Zerstäuber nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der Einsatz (20,120) mehrere Eingangskanäle (21) an der Seite der Nadel (7) des Ventils (6) aufweist, wobei diese Kanäle mit dem ringförmigen Kanal (22) in Verbindung stehen.
  4. Zerstäuber nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der hohle Farbenstrahl am Ausgang des Einsatzes zerstäubt und dann durch Luftströme, die aus Vorsprüngen (13a,13b) austreten, in einen flachen Strahl geformt wird.
  5. Zerstäuber nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der hohle Farbenstrahl eine radiale Geschwindigkeitskomponente am Ausgang des Einsatzes (120) aufweist.
  6. Zerstäuber nach einem der Ansprüche 3 oder 5, dadurch gekennzeichnet, daß das mittlere Innenteil (127) des Kanals des Einsatzes ein kegelstumpfförmiges Ende (128) aufweist, das einen Abweiser bildet.
  7. Zerstäuber nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der Einsatz (20) eine axiale Bohrung (25) aufweist, in der eine Ladungselektrode (26) angeordnet ist.
  8. Zerstäuber nach Anspruch 7, dadurch gekennzeichnet, daß die Elektrode (26) über den Einsatz (20) um eine Länge herausragt, die ausreicht, um mit dem zerdrückten Farbenstrom in Kontakt zu sein.
EP19940401327 1993-06-15 1994-06-14 Pneumatischer Flachstrahlzerstauber zum Versprühen von Beschichtungsmaterialien Expired - Lifetime EP0630690B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9307167A FR2706329B1 (fr) 1993-06-15 1993-06-15 Pulvérisateur pneumatique de produit de revêtement à jet plat.
FR9307167 1993-06-15

Publications (2)

Publication Number Publication Date
EP0630690A1 EP0630690A1 (de) 1994-12-28
EP0630690B1 true EP0630690B1 (de) 1997-04-23

Family

ID=9448123

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19940401327 Expired - Lifetime EP0630690B1 (de) 1993-06-15 1994-06-14 Pneumatischer Flachstrahlzerstauber zum Versprühen von Beschichtungsmaterialien

Country Status (4)

Country Link
EP (1) EP0630690B1 (de)
DE (1) DE69402762T2 (de)
ES (1) ES2101458T3 (de)
FR (1) FR2706329B1 (de)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6808122B2 (en) 2002-08-19 2004-10-26 Illinois Tool Works, Inc. Spray gun with improved pre-atomization fluid mixing and breakup
US7762476B2 (en) 2002-08-19 2010-07-27 Illinois Tool Works Inc. Spray gun with improved atomization
US7926733B2 (en) * 2004-06-30 2011-04-19 Illinois Tool Works Inc. Fluid atomizing system and method
US7883026B2 (en) 2004-06-30 2011-02-08 Illinois Tool Works Inc. Fluid atomizing system and method
US8684281B2 (en) 2006-03-24 2014-04-01 Finishing Brands Holdings Inc. Spray device having removable hard coated tip

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1285345A (fr) * 1961-01-10 1962-02-23 Harper J Ransburg Co Procédé électrostatique de revêtement et ses dispositifs de mise en oeuvre
FR1537997A (fr) * 1967-07-31 1968-08-30 Sames Mach Electrostat Dispositif de peinture à pulvérisation pneumatique
FR2052003A5 (de) * 1969-07-08 1971-04-09 Tunzini Sames
US3587967A (en) * 1970-01-08 1971-06-28 Ransburg Electro Coating Corp Spray coating apparatus
CH598871A5 (de) * 1975-07-29 1978-05-12 Air Ind
CH623751A5 (de) * 1977-12-23 1981-06-30 Gema Ag
US5074466A (en) * 1990-01-16 1991-12-24 Binks Manufacturing Company Fluid valve stem for air spray gun

Also Published As

Publication number Publication date
DE69402762D1 (de) 1997-05-28
FR2706329A1 (fr) 1994-12-23
ES2101458T3 (es) 1997-07-01
DE69402762T2 (de) 1997-11-13
EP0630690A1 (de) 1994-12-28
FR2706329B1 (fr) 1995-08-25

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