EP0411203A2 - Pistolet de pulvérisation - Google Patents

Pistolet de pulvérisation Download PDF

Info

Publication number
EP0411203A2
EP0411203A2 EP89116939A EP89116939A EP0411203A2 EP 0411203 A2 EP0411203 A2 EP 0411203A2 EP 89116939 A EP89116939 A EP 89116939A EP 89116939 A EP89116939 A EP 89116939A EP 0411203 A2 EP0411203 A2 EP 0411203A2
Authority
EP
European Patent Office
Prior art keywords
nozzle
needle
spray gun
section
closing cone
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.)
Granted
Application number
EP89116939A
Other languages
German (de)
English (en)
Other versions
EP0411203A3 (en
EP0411203B1 (fr
Inventor
Jozsef Frikker
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.)
ABB Flakt Inc
Original Assignee
DeVilbiss GmbH
ABB Flakt Inc
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 DeVilbiss GmbH, ABB Flakt Inc filed Critical DeVilbiss GmbH
Publication of EP0411203A2 publication Critical patent/EP0411203A2/fr
Publication of EP0411203A3 publication Critical patent/EP0411203A3/de
Application granted granted Critical
Publication of EP0411203B1 publication Critical patent/EP0411203B1/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
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/30—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages
    • B05B1/3033—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head
    • B05B1/3073—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head the controlling element being a deflector acting as a valve in co-operation with the outlet orifice
    • 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
    • B05B7/12—Spray pistols; Apparatus for discharge designed to control volume of flow, e.g. with adjustable passages
    • B05B7/1254—Spray pistols; Apparatus for discharge designed to control volume of flow, e.g. with adjustable passages the controlling means being fluid actuated
    • B05B7/1263—Spray pistols; Apparatus for discharge designed to control volume of flow, e.g. with adjustable passages the controlling means being fluid actuated pneumatically actuated
    • B05B7/1272—Spray pistols; Apparatus for discharge designed to control volume of flow, e.g. with adjustable passages the controlling means being fluid actuated pneumatically actuated actuated by gas involved in spraying, i.e. exiting the nozzle, e.g. as a spraying or jet shaping gas

Definitions

  • the invention relates to a spray gun with air atomization, with a housing with a nozzle and an axially displaceable needle which has a closing cone interacting with the nozzle and having an adjustable outflow cross section between the nozzle and the closing cone.
  • the conventional air atomizing spray guns which are equipped with a nozzle and a needle, atomize the liquid to be processed using compressed air.
  • Spray guns of this type are mainly used in paint spraying technology. Due to the different physical properties of the liquids, many types of nozzle and needle combinations with different bore diameters of the nozzles must be used in order to be able to atomize the large number of liquids optimally.
  • the needle has an adjustable stroke, with which the outflow cross section between the nozzle and the needle can be adjusted to a desired size.
  • the invention is therefore based on the object of developing a spray gun of the type mentioned in such a way that blockages within the nozzle due to drying liquid residues in particular are avoided.
  • the opening direction of the needle expediently lies in the outflow direction of the liquid flow. This promotes the outflow of the liquid from the spray gun.
  • the needle is advantageously mounted centrally in the nozzle, in particular near the outflow cross section, as a result of which a uniform centric and annular outflow cross section for the liquid is achieved.
  • At least one axial channel for the flow of the liquid is formed in the bearing for the needle.
  • the outflow cross-section which in particular has an annular cone shape that widens in the outflow direction, is preferably continuously adjustable outwards in the direction of the liquid flow. This allows a sensitive adjustment to different liquids to be processed can be reached.
  • the needle is expediently displaced axially by means of a piston which can be acted upon by compressed air, the stroke of the piston and thus the setting of the outflow cross section between the nozzle and the closing cone being advantageously adjustable by means of an axially adjustable stop ring, by means of which the piston travel is limited.
  • the spray gun 12 consists of a gun body 4, onto which a cylinder 3 is screwed, which has a connection 14 for the supply of compressed air.
  • a nozzle 2 is permanently installed in the gun body 4.
  • the nozzle 2 and the gun body 4 have a central bore in which a needle 1 cooperating with the nozzle 2 is arranged to be axially displaceable.
  • a piston 6 is axially displaceably installed, which can be acted upon by compressed air from port 14.
  • a sealing ring 16 is installed between the piston 6 and the cylinder 3.
  • the piston 6 has a radial collar which can abut against a stop ring 5, as a result of which the axial path of the piston 6 in the direction of the outflow opening of the spray gun is limited.
  • the stop ring 5 sits in an annular groove of the cylinder 3.
  • the inner end face of the piston 6 is, as shown, on a flange 18 and between the flange 18 and a disc 32 which is screwed onto the gun body 4, disc springs 10 are installed.
  • the flange 18 has a central threaded connector on which one Bush 20 is screwed on, which in turn has a neck or collar 22 which sits on the needle 1 or through which the needle 1 extends.
  • the end face of the collar 22 abuts a shoulder 24 of the needle 1.
  • the flange 18 has a central axial bore through which the needle 1 extends, on the left, threaded end 28 of which a nut 30 is screwed.
  • the flange 18 and the sleeve 20 are thus clamped between the shoulder 24 of the needle 1 and the nut 30 in the axial direction.
  • a sealing ring 34 and a sealing membrane 36 are installed between the disk 32 and the gun body 4.
  • the needle 1 is mounted centrally in the nozzle 2, which for this purpose has a bearing section 26 which forms a slide bearing for the needle 1.
  • the bearing section 26 directly adjoins the outer free end 38 of the nozzle 2, so that the needle 1 is mounted near the outflow opening of the liquid from the spray gun, thereby achieving a relatively precise central mounting of the needle 1 in the nozzle 2.
  • At least one axial channel 8 is formed in the bearing section 26 for the flow of the liquid to the outlet opening.
  • the needle 1 is equipped at its right end in the drawing with a closing cone 40 which interacts with the end 38 of the nozzle 2.
  • the closing cone 40 of the needle 1 is now arranged outside the outer end 38 of the nozzle 2, and together with the end 38 of the nozzle 2 it forms an annular cone-shaped outflow cross section 7.
  • the end 38 of the nozzle 2 has an end surface which widens conically in the outflow direction and which is opposite the conical surface of the closing cone 40, so that when these are open, between these two conical surfaces Spray gun of the annular conical outflow gap 7 is formed.
  • outlet openings 42 open for the atomizing air, through which the liquid emerging from the outflow cross section or outflow gap 7 is atomized.
  • a head piece 46 is screwed onto the gun body 4, and suitable channels and outlet openings 44 for so-called horn air are formed in this head piece 46, through which the atomized liquid stream can be brought into a desired shape, for example through the nozzles 44 emerging air can be brought into an elliptical shape.
  • suitable channels for the supply and passage of the atomizing air and the horn air are formed in the gun body 4 and in the head piece 46.
  • annular channel 52 is formed, into which the liquid to be atomized can be introduced via an inlet connection 50.
  • the spray gun according to the invention works as follows.
  • the cylinder 3 can be screwed more or less far onto the gun body 4, whereby the stroke of the piston 6 can be adjusted via the stop ring 5. Compressed air is applied to the latter via the connection 14, as a result of which it moves axially to the right in the figure until it strikes the stop ring 5.
  • the needle 1 is taken along with this movement and moved axially to the right in the figure, whereby the spray gun is opened, that is, the closing cone 40 which, when the spray gun is closed, on the conical exit surface of the End 38 of the nozzle 2 is seated, detaches from this surface and thereby gives the annular cone Outflow cross section 7 free.
  • the stroke of the piston 6 and thus the stroke of the needle 1 relative to the nozzle 2 and thus the size of the outflow cross section 7 can now be set.
  • the plate springs 10 are compressed accordingly.
  • the liquid flows from the inlet connection 50 through the annular space 52 between the needle 1 and the gun body 4 or nozzle 2 then through the axial channel 8 in the bearing section 26 and then through an annular channel 9 between the nozzle 2 and the end piece of the needle 1.
  • This end piece of the needle 1 has a somewhat smaller diameter than the central section, which is guided centrally in the bearing section 26.
  • a stop ring 54 which sits in a groove of the collar 22, and which can abut against the disk 32, defines the end position of the bushing 20 and the sealing membrane 36 to the left in the drawing, ie in the closing direction, when the needle 1 is removed.
  • the closing cone 40 is arranged outside the outer free end 38 of the nozzle 2, ie opposite this end and cooperating therewith. It opens and closes the nozzle 2.
  • no liquid for example a paint
  • the paint to be processed remains liquid anyway within the outlet gap 7.
  • the spray gun is not opened in the inward direction as before, but in the outward direction, which inevitably releases the set discharge cross-section 7 for the liquid.
  • the direction of movement of the needle 1 is identical to the direction of the liquid flow, thereby causing the liquid to flow out is positively influenced when the gun is opened.
  • the central guidance of the needle 1 in the nozzle 2 with the aid of the bearing section 26 results in a uniform, central discharge of the liquid from the nozzle, which has an advantageous effect on atomization.
  • the adjustment or the setting of the outflow cross-section 7 between the nozzle 2 and the nose 1 takes place, as stated above, by correspondingly rotating the cylinder 3 relative to the gun body 4, whereby the former is more or less screwed onto the latter and thus the stroke of the Piston 6 is set.
  • the adjustable ring cone shape of the liquid flow between the nozzle 2 and the needle 1 enables a very good adaptation of the liquid flow to the atomizing air, which has the advantage that with relatively low air pressure and relatively low air volume, optimal atomization is possible with only minimal spray mist.
  • the invention allows more economical atomization of air for many types of liquids with high surface tensions, such as, in particular, water-based paints.

Landscapes

  • Nozzles (AREA)
EP89116939A 1989-08-04 1989-09-13 Pistolet de pulvérisation Expired - Lifetime EP0411203B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3925931 1989-08-04
DE3925931A DE3925931A1 (de) 1989-08-04 1989-08-04 Spritzpistole

Publications (3)

Publication Number Publication Date
EP0411203A2 true EP0411203A2 (fr) 1991-02-06
EP0411203A3 EP0411203A3 (en) 1991-10-23
EP0411203B1 EP0411203B1 (fr) 1993-08-11

Family

ID=6386567

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89116939A Expired - Lifetime EP0411203B1 (fr) 1989-08-04 1989-09-13 Pistolet de pulvérisation

Country Status (6)

Country Link
EP (1) EP0411203B1 (fr)
JP (1) JPH03114559A (fr)
AU (1) AU6004890A (fr)
BR (1) BR9003801A (fr)
CA (1) CA2021970A1 (fr)
DE (2) DE3925931A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002361118A (ja) * 2001-06-12 2002-12-17 Rita System Kk 塗料供給用流量調節弁
JP4851158B2 (ja) * 2005-02-23 2012-01-11 旭サナック株式会社 塗装用エアスプレイ装置
DE102009020077A1 (de) 2009-05-06 2010-11-11 Dürr Systems GmbH Beschichtungsmittelvorrichtung und Beschichtungsvorrichtung
DE102013003897B4 (de) * 2013-03-06 2017-08-03 Audi Ag Düsenträger für die Befestigung einer Lackierdüse an einer Lackzerstäubereinrichtung und Lackzerstäubereinrichtung mit einem solchen Düsenträger
US9788566B2 (en) 2014-01-27 2017-10-17 Her Majesty The Queen In Right Of Canada As Represented By The Minister Of Natural Resources Process for drying and powderizing functional foods, nutraceuticals, and natural health ingredients
JP6531939B2 (ja) * 2015-04-09 2019-06-19 アネスト岩田株式会社 自動スプレーガン

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3059859A (en) * 1958-10-30 1962-10-23 Arleigh G Hupp Spraying apparatus
BE649073A (fr) * 1963-07-17 1964-10-01
US3396911A (en) * 1964-01-27 1968-08-13 Edward O. Norris Spray gun activation mechanism

Also Published As

Publication number Publication date
DE3925931A1 (de) 1991-02-07
AU6004890A (en) 1991-02-07
EP0411203A3 (en) 1991-10-23
JPH03114559A (ja) 1991-05-15
DE58905285D1 (de) 1993-09-16
EP0411203B1 (fr) 1993-08-11
CA2021970A1 (fr) 1991-02-05
BR9003801A (pt) 1991-09-03

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