US3171599A - Powder flame spray gun nozzle - Google Patents

Powder flame spray gun nozzle Download PDF

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Publication number
US3171599A
US3171599A US262987A US26298763A US3171599A US 3171599 A US3171599 A US 3171599A US 262987 A US262987 A US 262987A US 26298763 A US26298763 A US 26298763A US 3171599 A US3171599 A US 3171599A
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United States
Prior art keywords
nozzle
powder
face
conduit
ring
Prior art date
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Expired - Lifetime
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US262987A
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English (en)
Inventor
Anthony J Rotolico
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.)
Metco Inc
Original Assignee
Metco Inc
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Filing date
Publication date
Application filed by Metco Inc filed Critical Metco Inc
Priority to US262987A priority Critical patent/US3171599A/en
Priority to GB44394/63A priority patent/GB978530A/en
Priority to FR954155A priority patent/FR1374858A/fr
Priority to DEM60157A priority patent/DE1245813B/de
Application granted granted Critical
Publication of US3171599A publication Critical patent/US3171599A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • B05B7/16—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 incorporating means for heating or cooling the material to be sprayed
    • B05B7/20—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 incorporating means for heating or cooling the material to be sprayed by flame or combustion
    • B05B7/201—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 incorporating means for heating or cooling the material to be sprayed by flame or combustion downstream of the nozzle
    • B05B7/205—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 incorporating means for heating or cooling the material to be sprayed by flame or combustion downstream of the nozzle the material to be sprayed being originally a particulate material

Definitions

  • Powder fiame spray guns are devices utilized for spraying heat-fusible material, such as metal or ceramics which are fed to the gun in the form of a powder. As these guns are often used for spraying metal, they are sometimes commonly referred to as powder-type metal spray guns. These guns are often provided with burner jets for producing a conventional combustion flame and with means for conveying the powdered material to be sprayed, generally entrained in a carrier gas, through the flame, where the powder is melted or at least heat softened, and thence away from the gun, as for example onto a surface to be coated.
  • United States Patent 2,961,335, of November 22, 1960 describes a powder-type flame spray gun.
  • This phenomenon would be more troublesome with the spraying of certain materials and when, for example, spraying powders which will exothermically react in the flame, the phenomenon is particularly emphasized and troublesome. Furthermore, when spraying these exothermically reacting powders, the same would become ignited in the flame causing a back-firing and interrupting the spraying operation.
  • One object of this invention is a new nozzle construction for a powder type flame spray gun which has a substantially reduced tendency toward loading during spraying even when spraying materials, in connection with which this problem was particularly pronounced, and does not have the prior art back-firing tendencies even when spraying exothermically reacting powders.
  • FIG. 1 is a vertical section of an embodiment of a nozzle in accordance with the invention
  • FIG. 2 is a front elevation of the nozzle shown in FIG. 1,
  • FIG. 3 is a vertical section of a further embodiment of a nozzle in accordance with the invention.
  • FIG. 4 is a perspective view showing a still further embodiment of a nozzle in accordance with the invention mounted on an extension head, and
  • FIG. 5 is a vertical section of the nozzle shown in FIG. 4 with the extension head being diagrammatically shown.
  • 1 represents a nozzle body which is constructed of conventional material, as for example, leaded copper.
  • the forward end of the nozzle body has a substantially fiat nozzle face 2.
  • the intermediate portion of the jets has a slightly enlarged bore at 4 and terminates at the rear face of the nozzle body in the annular groove 5.
  • a central powder conduit 6 is drilled through the nozzle body and is concentrically positioned with respect to the ring of burner jets 3.
  • the forward end of the central powder conduit 6 terminates as a cylindrical extension '7 which projects past the Hat portion 2. on the face of the nozzle body.
  • An annular channel 8 is cut into the face of the nozzle body and is concentrically positioned between the central powder conduit 6 and ring of burner jets 3.
  • the inner wall of the groove 8 is defined by the cylindrical extension 7.
  • a multiple number of air holes 9 radially extend through the side wall of the nozzle body in communication with the annular channel 8. In the embodiment shown eight such air holes are provided, one positioned between each pair of adjacent burner jets 3. The positioning of these radial air holes may be seen by the dotted lines in FIG. 2.
  • the nozzle is attached to the forward end of a powder type flame spray gun in the conventional manner, as for example by the use of a nut which screws on the forward end of the gun and which engages the flange 10 provided on the nozzle body.
  • the nozzle may thus be connected to a gun of the type shown in United States Patent 2,961,335 in identical manner as the nozzle shown on said gun.
  • the fuel and combustion supporting gas passages on the gun are in communication with the groove 5 in the rear face of the nozzle body and a combustible mixture of these gases, as for example acetylene and oxygen, passes from the groove 5 through the portion 4 of the burner jets and out through the burner jets 3 where the same is ignited forming a ring or sheath of flame surrounding the central powder conduit 6.
  • the central powder conduit 6 is in communication with the means provided in the flame spray gun for feeding powder entrained in a carrier gas and the entrained powder passes through the conduit 6 out of the nozzle and within the flame sheath propagated from the ring of burner jets 3.
  • the powder particles are melted or at least softened and propelled away from the gun, as for example onto a surface being coated.
  • the flame spray gun is operated in the conventional manner, as for example in the manner de scribed in United States Patent 2,961,335 and the nozzle is simply used in place of the nozzle shown in said patent.
  • the tendency toward loading with melted powder is substantially decreased even when spraying materials which normally have a pronounced tendency toward such nozzle loading, as for example, exothermically re acting powder, and the tendency toward back-firing is substantially reduced.
  • FIG. 3 is identical to that shown in FIGS 1 and 2 in construction and operation except that the cylindrical extension 7 is enclosed at its forward end at 11 and provided with a multiple number of jets 12, as for example eight jets equally spaced on a circle and which are divergent, i.e. directed outwardly from the axis of the conduit 6.
  • a multiple number of jets 12 as for example eight jets equally spaced on a circle and which are divergent, i.e. directed outwardly from the axis of the conduit 6.
  • This embodiment is particularly adaptable for spraying ceramic and other high melting point material powders on passing through the central outer conduit 6 are V 3 diffused outwardly by the divergent direction of the jects 12 into the flame sheath.
  • the nozzle as shown in FIGS. 421ml 5, is for use with a conventional extension head, as for example for spraying the inside of cylinders.
  • the nozzle body is formed of three parts, i.e. the outer body 13, the intermediate cylindrical insert 14, and the inner cylindrical insert 15, which are all constructed of copper and may be assembled as an integral unit, as for'example with the soldered joints 16 and 17.
  • the intermediate cylindrical insert 14 has a multiple number of burner jets 19 which are arranged in the form of a ring and terminate at the flat nozzle face 18. The burner jets are in communication with the annular channel 211 formed between the outer body 13 and intermediate insert 14.
  • a passage 21 in the outer body of 13 communicates the groove with a cylindrical socket bore 2 2 for the oxygen and fuel gas conduit 23 provided in the extension head 24.
  • a central powder conduit 25 is provided in the inner insert 15 and nozzle body 13 and is concentrically positioned within the ring of burner jets 19.
  • the central insert 15 form a cylindrical extension 26 of the central powder conduit 25 which extends past the fiat portion 18 of the nozzle face.
  • a passage 27 in the body 13 communicates the powder conduit 25 with a cylindrical socket 28 into which the powder conduit 29 of the extension head fits.
  • An annular channel 30/ is formed by the central insert 15 between it and the intermediate 14. This annular channel 31) is concentrically positioned between the central powder conduit 25 and the ring of burner jets 19.
  • An annular groove 31 is provided in the body 13 and 7 this groove is in communication with the channel 30 by means of one or more passages 32 in the intermediate insert 14
  • a passage 33 in the body 13 communicates the groove 31 with the rear face of the nozzle body and a compressed air conduit 34 leadsthrough the extension head to an air metering jet 35, and thence to the passage 33.
  • Air is fed through the air conduit 34 by meansof the air compressor diagrammatically shown.
  • the nozzle body is held in place on the extension head by means of the threaded nut 36.
  • fuel and combustion supporting gases as for example oxygen, acetylene, or the like, pass through the conduit 23 and the passage 21 into the grooveZQ and thence through the burner jets 19 where the same is ignited at the nozzle face. forming a ring or sheath of the flame.
  • the powder is to be sprayed, entrained in the carrier gas, is passed through the conduit 29, the passage 27 and out through the central powder conduit 25 whence 'the same passes through the flame and is melted or at least heat softened and propelled against the surface to be coated.
  • Compressed air from the air compressor is passed through the conduit 34, passes through the meter ing jet 35, passage 33, into the groove 31. From the groove 31, the air passes through the passage 32 into the annular channel 30 and out of the same as a buffer sheath of air between the entrained powder emerging from the central powder conduit 25 and the flame sheath formed from the ring of burner jets 19.
  • the spraying in all respects is effected in the conventional manner, and the extension may, for example, be positioned in a cylinder to spray the side wall thereof.
  • the extension may, for example, be positioned in a cylinder to spray the side wall thereof.
  • the cylindrical extension of the central powder conduit passage and the annular channel surrounding the same through which air passes apparently sets up flow characteristics which prevent the conventionally occurring nozzle loading and back-firing tendencies.
  • the cylindrical extension should extend past the nozzle face at least A of an inch and in connection with conventiontional nozzle sizes, having for example a central powder conduit with a diameter between and is preferably extended from t'o' about past the nozzle face.
  • the extension may be dispensed with and the powder conduit may terminate flush with the nozzle face.
  • the air should be passed through the device at a flow rate of at least 0.3 s.c.f.m. and preferably from 0.5 s.c.f.m. to 1 s.c.f.m.
  • a nozzle for a powder flame spray gun comprising a nozzle body terminating with a nozzle face having a substantially flat portion, a multiple number of burner jets arranged in the form of a ring in said body and terminating at the flat portion of said face, a central powder conduit extending through said body concentrically positioned Within said ring of burner jets and terminating as a cylindrical extension past said fiat portion of said face, an annular channel in said face, concentrically positioned between said central powder con duit and said ring of burner jets surrounding said cylindrical extension and a multiple number of air holes

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Nozzles (AREA)
US262987A 1963-03-05 1963-03-05 Powder flame spray gun nozzle Expired - Lifetime US3171599A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US262987A US3171599A (en) 1963-03-05 1963-03-05 Powder flame spray gun nozzle
GB44394/63A GB978530A (en) 1963-03-05 1963-11-11 Powder flame spray gun nozzle
FR954155A FR1374858A (fr) 1963-03-05 1963-11-18 Buse pour chalumeau pour la projection de matériaux en poudre
DEM60157A DE1245813B (de) 1963-03-05 1964-03-04 Mundstueck fuer eine Pulver-Flammspritzpistole

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US262987A US3171599A (en) 1963-03-05 1963-03-05 Powder flame spray gun nozzle

Publications (1)

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US3171599A true US3171599A (en) 1965-03-02

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US262987A Expired - Lifetime US3171599A (en) 1963-03-05 1963-03-05 Powder flame spray gun nozzle

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US (1) US3171599A (de)
DE (1) DE1245813B (de)
GB (1) GB978530A (de)

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4333416A (en) * 1980-04-14 1982-06-08 Eutectic Corporation Extension nozzle attachment for a flame-spray torch
US4632309A (en) * 1984-09-11 1986-12-30 Plastic Flamecoat Systems, Inc. Method and apparatus for spray coating
WO1987002278A1 (en) * 1985-10-11 1987-04-23 Plastic Flamecoat Systems, Inc. Method and apparatus for spray coating
US4835022A (en) * 1986-07-29 1989-05-30 Utp Schweibmaterial Gmbh & Co. Kg Process and apparatus for coating components
US4863102A (en) * 1987-10-20 1989-09-05 Spectran, Inc. CVD torch
US4865252A (en) * 1988-05-11 1989-09-12 The Perkin-Elmer Corporation High velocity powder thermal spray gun and method
US4928879A (en) * 1988-12-22 1990-05-29 The Perkin-Elmer Corporation Wire and power thermal spray gun
US5014916A (en) * 1990-04-25 1991-05-14 The Perkin-Elmer Corporation Angular gas cap for thermal spray gun
US5058610A (en) * 1988-12-15 1991-10-22 Pioneer Electronic Corporation Fluid supplying and processing device
US5297733A (en) * 1991-09-16 1994-03-29 Plastic Flamecoat Systems, Inc. Flame spray gun
US6054178A (en) * 1995-02-21 2000-04-25 Serrot International, Inc. Fabric mesh reinforced monolithic thermoplastic membrane
US6478234B1 (en) 2001-06-18 2002-11-12 Northrop Grumman Corporation Adjustable injector assembly for melted powder coating deposition
US20060180080A1 (en) * 2005-02-11 2006-08-17 Sulzer Metco Ag Apparatus for thermal spraying
WO2006098667A1 (en) * 2005-03-18 2006-09-21 Volvo Aero Corporation Nozzle for a combustion powder spray gun
US20080083369A1 (en) * 2001-09-06 2008-04-10 Tatsuo Nakamura Process and apparatus for manufacturing fiber and fiber sheet carrying solid particles and fiber and fiber sheet carrying solid particles
US20150182989A1 (en) * 2009-01-14 2015-07-02 Resodyn Corporation Flameless thermal spray system using flame heat source

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3033579C2 (de) * 1980-09-06 1985-11-14 Hühne, Erwin, 7801 Schallstadt Rückzündsicheres Auftragsgerät

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2209323A (en) * 1937-06-07 1940-07-30 John T Corley Apparatus for producing fog streams
US2643955A (en) * 1950-08-26 1953-06-30 Union Carbide & Carbon Corp Method of and apparatus for flame spraying polyethylene and other plastics
FR1054610A (fr) * 1952-04-18 1954-02-11 Acetylene Dissous Du Sud Est L Procédés de revêtement de surfaces extérieures de constructions métalliques, d'application à chaud de couches de protecteurs divers, de décapage des surfaces métalliques, et appareillage pour la mise en oeuvre de ces procédés
US2800419A (en) * 1953-11-27 1957-07-23 Coast Metals Inc Method and apparatus for hard surfacing metals

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2125764A (en) * 1934-10-31 1938-08-02 Benoit Francois Philip Charles Apparatus for projection of molten pulverized bodies
CH200074A (fr) * 1936-02-19 1938-09-30 Benoit Francois Philippe Charl Appareil pour projeter des corps pulvérisés à l'état fondu à haute température sur des objets de toute nature.

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2209323A (en) * 1937-06-07 1940-07-30 John T Corley Apparatus for producing fog streams
US2643955A (en) * 1950-08-26 1953-06-30 Union Carbide & Carbon Corp Method of and apparatus for flame spraying polyethylene and other plastics
FR1054610A (fr) * 1952-04-18 1954-02-11 Acetylene Dissous Du Sud Est L Procédés de revêtement de surfaces extérieures de constructions métalliques, d'application à chaud de couches de protecteurs divers, de décapage des surfaces métalliques, et appareillage pour la mise en oeuvre de ces procédés
US2800419A (en) * 1953-11-27 1957-07-23 Coast Metals Inc Method and apparatus for hard surfacing metals

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4333416A (en) * 1980-04-14 1982-06-08 Eutectic Corporation Extension nozzle attachment for a flame-spray torch
US4632309A (en) * 1984-09-11 1986-12-30 Plastic Flamecoat Systems, Inc. Method and apparatus for spray coating
WO1987002278A1 (en) * 1985-10-11 1987-04-23 Plastic Flamecoat Systems, Inc. Method and apparatus for spray coating
US4835022A (en) * 1986-07-29 1989-05-30 Utp Schweibmaterial Gmbh & Co. Kg Process and apparatus for coating components
US4863102A (en) * 1987-10-20 1989-09-05 Spectran, Inc. CVD torch
US4865252A (en) * 1988-05-11 1989-09-12 The Perkin-Elmer Corporation High velocity powder thermal spray gun and method
US5058610A (en) * 1988-12-15 1991-10-22 Pioneer Electronic Corporation Fluid supplying and processing device
US4928879A (en) * 1988-12-22 1990-05-29 The Perkin-Elmer Corporation Wire and power thermal spray gun
US5014916A (en) * 1990-04-25 1991-05-14 The Perkin-Elmer Corporation Angular gas cap for thermal spray gun
US5297733A (en) * 1991-09-16 1994-03-29 Plastic Flamecoat Systems, Inc. Flame spray gun
US6054178A (en) * 1995-02-21 2000-04-25 Serrot International, Inc. Fabric mesh reinforced monolithic thermoplastic membrane
US6478234B1 (en) 2001-06-18 2002-11-12 Northrop Grumman Corporation Adjustable injector assembly for melted powder coating deposition
US20080083369A1 (en) * 2001-09-06 2008-04-10 Tatsuo Nakamura Process and apparatus for manufacturing fiber and fiber sheet carrying solid particles and fiber and fiber sheet carrying solid particles
US20060180080A1 (en) * 2005-02-11 2006-08-17 Sulzer Metco Ag Apparatus for thermal spraying
US7578451B2 (en) * 2005-02-11 2009-08-25 Sulzer Metco Ag Apparatus for thermal spraying
WO2006098667A1 (en) * 2005-03-18 2006-09-21 Volvo Aero Corporation Nozzle for a combustion powder spray gun
US20150182989A1 (en) * 2009-01-14 2015-07-02 Resodyn Corporation Flameless thermal spray system using flame heat source

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Publication number Publication date
DE1245813B (de) 1967-07-27
GB978530A (en) 1964-12-23

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