US3226028A - Flame-spraying torch - Google Patents

Flame-spraying torch Download PDF

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Publication number
US3226028A
US3226028A US297844A US29784463A US3226028A US 3226028 A US3226028 A US 3226028A US 297844 A US297844 A US 297844A US 29784463 A US29784463 A US 29784463A US 3226028 A US3226028 A US 3226028A
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US
United States
Prior art keywords
mixing chamber
passageway
gas
powder
combustion supporting
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
US297844A
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English (en)
Inventor
Donald C Schilling
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.)
Eutectic Corp
Original Assignee
Eutectic Welding Alloys Corp
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 Eutectic Welding Alloys Corp filed Critical Eutectic Welding Alloys Corp
Priority to US297844A priority Critical patent/US3226028A/en
Priority to GB50433/63A priority patent/GB1016808A/en
Priority to DE19631621866D priority patent/DE1621866B1/de
Priority to AT10612/67A priority patent/AT281535B/de
Priority to AT507064A priority patent/AT266535B/de
Priority to CH772963A priority patent/CH419918A/fr
Priority to CH971764A priority patent/CH422597A/fr
Application granted granted Critical
Publication of US3226028A publication Critical patent/US3226028A/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
    • B05B7/206—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 in a container fixed to the discharge device

Definitions

  • Flame-spraying torches are used for applying metal and plastic coatings upon surfaces by spraying them with powder-laden flame.
  • Such torches utilize mixtures of combustible and combustion supporting gas such as acetylene and oxygen, which are susceptible to flash back and explosion. Flash back is particularly dangerous when it occurs in a powder container made of a relatively light material that is likely to fly apart into dangerous fragments.
  • An object of this invention is to provide a flame-spraying torch in which the danger of flash back is minimized.
  • Another object is to provide such a torch in which flash back will not occur in the powder supplying passages and container.
  • a further object is to provide a simple and dependable structure for such a torch.
  • powder is introduced into the passageway for the combustion supporting gas
  • the passageways for the gases are constructed and arranged to facilitate maintenance of an eflicient flame, such as a neutral flame of the desirable equal pressure torch type, when the pressure of combustion supporting gas is substantially greater than that of combustible gas. This prevents a combustible gas such as acetylene from flowing back within the torch from the point of mixture, and minimizes any flash back from occurring in the mixing chamber or in the powder supplying components. Explosions in the powder container are accordingly prevented.
  • FIG. 1 is a side view in elevation of one embodiment of this invention
  • FIG. 2 is a cross-sectional view taken through FIG. 1 along the line 22;
  • FIG. 3 is a full size view in elevation partially broken away in cross section of the embodiment shown in FIG. 1;
  • FIG. 4 is an enlarged three-dimensional view broken away in cross section of part of the embodiment shown in FIG. 3;
  • FIG. 5 is an enlarged front view in elevation of another part of the embodiment shown in FIG. 3;
  • FIG. 6 is a cross-sectional view taken through FIG. 5 along the line 66.
  • Separate longitudinal passageways 16 and 18 extend part of the way through body 14 for respectively conducting a pressurized combustible gas such as acetykm and a pressurized combustion supporting gas such as oxygen through body 14.
  • Gas injecting assembly or handle 20 including similar passageways 16 and 18 is connected to the back of body 14 as a convenient means of connecting a pressurized source of such gases thereto.
  • pressurized is used herein in the usual engineering sense to refer to pressures above atmospheric pressure. Such pressures are also described as positive gauge pressures in common engineering terminology.
  • a powder supplying passageway 22 having a valve 24 interposed in it is mounted upon body 14.
  • Powder supplying passageway 22, valve 24 (both shown in FIG. 3) and powder container 26 and its mode of connection to body '14 are substantially similar to that described in commonly assigned copending application U84, S.N. 286,343 filed June 7, 1963, and details of their mode of operation and structure are described therein and later herein.
  • powder supplying passageway 22 intersects combustion supporting gas passageway 18 before passageway 18 enters mixing chamber 28 where it joins with acetylene passageway 16.
  • a relatively restricted section 30 is interposed between passageway 18 and mixing chamber 28 to increase the velocity and decrease the pressure therein at the point where powder supplying passageway 22 intersects the passageway carrying the combustion supporting gas, such as oxygen. This facilitates the feeding of powder into the oxygen stream.
  • Restricted low pressure passageway 30 is conveniently incorporate-d within nozzle tip 32 which is slightly spaced by conical powder insertion space 34 from transition tube 36 which carries the oxygen to mixing chamber 28.
  • Intermediate passageways 38 and 40 respectively join restricted low pressure passageway 30 with supply passageway 18 and mixing chamber 28.
  • gas and powder mixing assembly 41 including nozzle 43, mixing tube 45 and intermediate sleeve 47
  • Sleeve 47 holds nozzle 43 and mixing tube 45 together and also feeds powder into the conical low pressure space 34 between them.
  • Nozzle 43 includes peripherally spaced passageways 49 (three for example distorted into the plane of FIG. 3 for the convenience of illustration) extending longitudinally through it for conducting acetylene through it between annular distributing grooves 51.
  • a pair of longitudinal passageways 53 in sleeve 47 conduct the acetylene into annular groove 57 between sleeve 47 and central flange 55 of mixing tube 45.
  • Three inwardly and forwardly inclined passageways 59 convey acetylene through central flange 55 from annular groove 57 into mixing chamber 28.
  • Annular grooves 51 and 57 are actually formed by a pair of semi-circular annular grooves in mating surfaces. The contact of these mating surfaces about grooves 51 and 57 provides a dependable seal for the gas being conducted within them.
  • Sleeve 47 includes a pair of transverse passageways 63, one of which forms a continuation of powder supplying passageway 22 into communication with low pressure powder supply space 34.
  • the pair of transverse passageways 63 permits each of them to be disposed close to the ends of sleeve 47 thereby providing an appreciable distance between the one in line with powder supply passageway 22 and mixing chamber 28.
  • the provision of an extra passageway 63 insures that one of them will be aligned with powder supplying passageway 22 either direction that sleeve 47 is assembled.
  • sleeve 47 is secured in place by insertion of the tip of drive screw 65 within slot 67 in sleeve 47.
  • the combustible gas such as acetylene is carried through passageways 16 and 53 into mixing chamber 28.
  • Mixing chamber 28 is spaced from powder supplying space 34 and passageway 22 by intermediate passageway 40 to help isolate the powder supplying areas from the mixing chamber.
  • valve assembly 24 The structure of resilient insert 44 of valve assembly 24 is shown in detail in FIG. 2 to illustrate the vertical hole 46 through insert 44 that is opened and closed by reciprocal action of plunger 48 in response to movement of lever 50 and the reaction of coil spring 52.
  • valve 24 In FIG. 1 valve 24 is in the open condition with lever 50 depressed to allow hole 46 to remain open and to cause the powder to flow from container 26 through passageway 22 into space 34 and therefrom into the stream of oxygen.
  • the outer stem 71 of plunger 48 is inserted within a. bushing 73 of a natural lubricating material such as a tetrafluoroethylenepolymer which slides within sleeve '75 at the rear of the upper portion 77 of body 14.
  • Lever 50 is rotatably connected to stem '71 by pin 79, and a lower extension 81 of lever 50 abuts against projection 83' upon body 14 to provide a fulcrum point for applying the force of lever 59 to reciprocate stem 75.
  • Self-lubricating bushing 73 which is made for example of Teflon the trademark of a tetrafluoroethylene product of the Du Pont Company, facilitates the case, controlability and stability of operation of the lever 50, stem 71 and plunger 43.
  • Passagew ays l8 and 16 and continuations thereof up to mixing chamber 28 are proportioned to provide an efficient flame at the end of torch It), such as a neutral flame of the type provided in an equal pressure type of torch.
  • the drawing is in approximate full size scale, and the proportions shown therein provide an efiicient operative arrangement when the pressure of oxygen is maintained between 16 to 25 pounds per square inch and the acetylene from 3 to 4 pounds per square inch. For smaller tip sizes a 16 to 18 pound per square inch oxygen pressure is operative with 3 pounds per square inch acetylene, and the higher pressures of oxygen up to 25 pounds per square inch are utilized for larger tip sizes. These pressures however are primarily illustrative in accordance with the specific torches described.
  • the greater supply pressure of oxygen relative to acetylene, and the insertion of the powder into the oxygen stream at a point spaced ahead of the mixing chamber prevents the acetylene from flowing backwardly from the mixing chamber should a stoppage of gas flow occur at the tip, such as in backfiring.
  • the higher pressure of oxygen blocks the flow of acetylene thereby preventing any explosive gas mixtures from being formed within the body of the torch, which might explode or sustain combustion within it to cause undesirable heating or burning out from flash back.
  • a flame-spraying torch comprising a body, a tip section .disposed in front of said body, separate longitudinal passageways in said body for separately conducting a pressurized combustible and a pressurized combustion supporting gas partially through said body, a mixing chamber in said body, said passageway for said pressurized combustible gas joining said mixing chamber, a discharge passageway extending from said mixing chamber through the front of said body and said tip section for discharging gases from said mixing chamber, a powder Supplying passageway extending through said body into communication with said passageway for pressurized combustion supporting gas at an intersection therewith, said separate longitudinal passageways having means for facilitating maintenance of an efficient flame when the supplied pressure of combustion supporting gas is greater than the supplied pressure of said combustible gas, and an intermediate passageway connecting said intersection with said mixing chamber and conducting said greater supplied pressure of pressurized combustion supporting gas from said intersection to said mixing chamber whereby said powder supplying passageway is isolated from said mixing chamber to prevent said combustible gas from flowing backwardly into said powder supplying passageway
  • said forwardly inclined portion of said passageway for said pressurized combustible gas includes a plurality of forwardly inclined passageways that join said mixing chamher.
  • a torch as set forth in claim 1 wherein said powder supplying passageway is substantially vertically disposed to pass down through said body to said intersection whereby it conducts thereto powder under the influence of gravity.
  • a flame-spraying torch comprising a body, a tip section disposed in front of said body, separate longitudinal passageways in said body for separately conducting a combustible and combustion supporting gas partially through said body, a mixing chamber in said body, said passageways joining each other at said mixing chamber, a discharge passageway extending from said mixing chamber through the front of said body and said tip section for discharging gases from said mixing chamber, a powder supplying passageway extending through said body into communication with said passageway for combustion supporting gas before it joins said mixing chamber, said separate longitudinal passageways being constructed and arranged to facilitate maintenance of an efficient flame When the supplied pressure of combustion supporting gas is greater than the supplied pressure of said combustible gas thereby preventing said combustible gas from flowing backwardly into said powder supplying passageway from said mixing chamber and accordingly minimizing flash back, said passageways and mixing chamber being incorporated within a gas and powder mixing assembly inserted within said body, said assembly comprising a nozzle having a tip and a flange, a mixing tube including a central
  • transverse powder supplying passageway is disposed adjacent one end of said sleeve for maintaining it spaced from said mixing chamber, and a pair of said transverse passageways are disposed equidistantly from the ends of said sleeve to facilitate the assembly of said sleeve in both directions with one of said transverse passageways aligned with said powder supplying passageways.
  • a torch as set forth in claim 10 wherein a central longitudinal passageway extends through said assembly for conducting said combustion supporting gas, and the portion of said central longitudinal passageway in the top of said nozzle adjacent said space is of relatively restricted cross section for minimizing the pressure in said space to facilitate the feeding of powder into it.
  • a process for flame spraying a fusible powder surface by means of a gas torch having a mixing chamber in which combustible and combustion supporting gas passageways join each other which comprises the steps of supplying said powder into said passageway for combustion supporting gas before it joins said mixing chamber, and maintaining the supplied pressure of combustion supporting gas greater than that of said combustible gas for preventing said combustible gas from following backwardly into said powder supplying passageway from said mixing chamber whereby flash back is prevented.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Nozzles (AREA)
  • Coating Apparatus (AREA)
US297844A 1963-07-26 1963-07-26 Flame-spraying torch Expired - Lifetime US3226028A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
US297844A US3226028A (en) 1963-07-26 1963-07-26 Flame-spraying torch
GB50433/63A GB1016808A (en) 1963-07-26 1963-12-20 Improvements in or relating to powder-fed flame-spraying torches
DE19631621866D DE1621866B1 (de) 1963-07-26 1963-12-27 Dosiervorrichtung fuer die Pulverzufuhr in Brennern zum Flammspritzen
AT10612/67A AT281535B (de) 1963-07-26 1964-06-12 Dosiervorrichtung fuer die pulverzufuhr in brennern zum flammspritzen
AT507064A AT266535B (de) 1963-07-26 1964-06-12 Brenner zum Flammspritzen
CH772963A CH419918A (fr) 1963-07-26 1964-07-24 Procédé pour la formation d'un revêtement au moyen d'une poudre fusible
CH971764A CH422597A (fr) 1963-07-26 1964-07-24 Chalumeau pour la formation d'un revêtement au moyen d'une poudre fusible

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US297844A US3226028A (en) 1963-07-26 1963-07-26 Flame-spraying torch

Publications (1)

Publication Number Publication Date
US3226028A true US3226028A (en) 1965-12-28

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ID=23147959

Family Applications (1)

Application Number Title Priority Date Filing Date
US297844A Expired - Lifetime US3226028A (en) 1963-07-26 1963-07-26 Flame-spraying torch

Country Status (5)

Country Link
US (1) US3226028A (de)
AT (2) AT266535B (de)
CH (2) CH419918A (de)
DE (1) DE1621866B1 (de)
GB (1) GB1016808A (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3430862A (en) * 1965-05-04 1969-03-04 Eutectic Welding Alloys Protective shield for a flame spraying torch
US3436019A (en) * 1966-05-24 1969-04-01 Coast Metals Inc Adapter for converting torch to powder spray work
US3476320A (en) * 1967-05-09 1969-11-04 Tescom Corp Apparatus for flame spraying powder
US3986668A (en) * 1975-01-09 1976-10-19 Eutectic Corporation Safety double injector spray device or torch
US4099481A (en) * 1976-09-30 1978-07-11 Eutectic Corporation Apparatus for applying metal coatings to a metal substrate
US20050199739A1 (en) * 2002-10-09 2005-09-15 Seiji Kuroda Method of forming metal coating with hvof spray gun and thermal spray apparatus
CN114059003A (zh) * 2021-10-25 2022-02-18 成都飞机工业（集团）有限责任公司 一种便携式移动火焰喷铝设备

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6929468B2 (en) * 2003-11-17 2005-08-16 Arlo Lin Blowtorch

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE551077A (de) *
US1617166A (en) * 1921-02-08 1927-02-08 Schoop Max Ulrich Device for coating articles with glass, enamel, quartz, and metals
US2671689A (en) * 1950-08-04 1954-03-09 Wett Ernst Apparatus for coating metals by means of powdered material
US2786779A (en) * 1953-02-09 1957-03-26 Dewrance & Co Method and apparatus for powdered metal deposition by oxy-fuel gas flame

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE551077A (de) *
US1617166A (en) * 1921-02-08 1927-02-08 Schoop Max Ulrich Device for coating articles with glass, enamel, quartz, and metals
US2671689A (en) * 1950-08-04 1954-03-09 Wett Ernst Apparatus for coating metals by means of powdered material
US2786779A (en) * 1953-02-09 1957-03-26 Dewrance & Co Method and apparatus for powdered metal deposition by oxy-fuel gas flame

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3430862A (en) * 1965-05-04 1969-03-04 Eutectic Welding Alloys Protective shield for a flame spraying torch
US3436019A (en) * 1966-05-24 1969-04-01 Coast Metals Inc Adapter for converting torch to powder spray work
US3476320A (en) * 1967-05-09 1969-11-04 Tescom Corp Apparatus for flame spraying powder
US3986668A (en) * 1975-01-09 1976-10-19 Eutectic Corporation Safety double injector spray device or torch
US4099481A (en) * 1976-09-30 1978-07-11 Eutectic Corporation Apparatus for applying metal coatings to a metal substrate
US20050199739A1 (en) * 2002-10-09 2005-09-15 Seiji Kuroda Method of forming metal coating with hvof spray gun and thermal spray apparatus
US20100304036A1 (en) * 2002-10-09 2010-12-02 Seiji Kuroda Metallic film forming method using hvof thermal spraying gun and thermal spraying apparatus
CN114059003A (zh) * 2021-10-25 2022-02-18 成都飞机工业（集团）有限责任公司 一种便携式移动火焰喷铝设备

Also Published As

Publication number Publication date
AT281535B (de) 1970-05-25
GB1016808A (en) 1966-01-12
AT266535B (de) 1968-11-25
DE1621866B1 (de) 1970-10-22
CH422597A (fr) 1966-10-15
CH419918A (fr) 1966-08-31

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