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Publication numberUS2125764 A
Publication typeGrant
Publication dateAug 2, 1938
Filing dateOct 19, 1935
Priority dateOct 31, 1934
Publication numberUS 2125764 A, US 2125764A, US-A-2125764, US2125764 A, US2125764A
InventorsCharles Benoit Francois Philip
Original AssigneeCharles Benoit Francois Philip
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Apparatus for projection of molten pulverized bodies
US 2125764 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

Aug. 2, 1938. p, c BENQIT 2,125,764


Patented Aug. 2, 1938 v APPARATUS FOR PROJECTION F MOLTEN i PULVEBIZED BODIES i Francois Philippe Charles Benoit, Paris, France sppiiootionootobor 1a, 1935, Serial No. sms In France October 31, 1934 1 Claim. (oral-12.2

The invention, which is an improvement in or,

. modification of the apparatus for projecting molten pulverized bodies which forms the subject of Patent No. 1,998,217 as improved upon or modifled by the invention forming the subject of Patent 2,072,845,1s concernedwith the cooling of the nozzle of the burner, in order to. prevent it from reaching an excessive temperature after prolonged operation, and with means for effecting i this cooling.

The burner disclosed particularly in Patent 2,072,845 gives a flame of very high temperature.

As a result. the temperature of the burner itself may rise gradually to a value such that it is necessary to limit the duration of use of the burner in .order to avoid upsetting of the flame and autoignition oi. the combustible mixture. These drawbacks are obviated by the present invention,

burner itself or around the burner a particular cooling system which prevents the temperature of the said burner from rising excessively. This cooling may be obtained by bringing air or any other suitable fluid in flow into contact with the I burner nozzle so as to abstract excessive heat from the metal and dissipate it outwardly.

In order to leave no doubt regarding the invention, I have hereinaiter described below, but by way of example only, some forms of construction, with reference to the accompanying drawing, in which:

Fig. 1 is an axial section of a burner provided internally with passages for cooling air, and, it

desired, provided externally with flns which increase the surface cooled bythe surrounding air. Fig. 2 is a transverse section on the line 11-12 of Fig. 1.

Fig. 3 is a transverse section on the line of Fig.1.. a l

Fig. 4 is a front view of the burner tip. As in the specifications of the said prior patents, there is shown in these figures, at 64, axially of the. burner, thedelivery passage for the current of aircarrying in suspension the powdermto be Projected. The gaseous combustible mixture is delivered by passages 61, said mixture being led by way of the annular groove I to the passages I which open at '9 at the burner tip around the let of air laden with powder.

An additional passage I is connected to a source of supply of compressed air; this air, which serves for the projection of the powder after it is fused in the heating flame, serves in the flrst which consists essentially in establishing in the lines in Fig. 1.

place for cooling the burner, and, in particular With this object in view, the air which is delivered by way of I is distributed by an annular groove Ill among passages Ill leading to the conical surface between the spool I and. the cap I50. An annular groove lei, cut for ex- 5 ample in thebore oi the cap lil. distributes this airamong' passages I52 extending along generatrices of the conical exterior surface of the spool M'L- It will be seen that 1: thus obtain jets oi compressed air issulngin the form of a ring around the flame and serving to propel the powder.

This air is heated during its flow along the passages I49, thus cooling the spool I" in which these passages are formed. 1

Further, in flowing through the passages I52,

the air cools both the spool M1 and the cap lill .ment of these fins may be varied.

Byway of example Fig. 4-shows radially disposed fins having a profilerepresented in dotted .These fins may be formed in parallel planes so as to be adapted for example 9 to natural air currents or currents set up by ventilation, having a determined orientation. Also, the cap I" may be surrounded by an envelope so as'to provide around it a jacket chamber in which may be circulated a suitable fluid, 35 such as air, water, oil, etc., adapted to cool .by convection the exterior'sur'iace of the cap I".

It sufllces to connect the said chamber to a source of fresh fluid and to provide it with a conduit for withdrawal of the heated fluld.. The circulation 49 of the said fluid may be obtained by any suitable means; and tubes for the delivery and discharge of the fluid may be flxed at any suitable points of the chamber. The chamber may also be prohas in particular the advantage that it permits of obtaining, by means of a single screw joint lit, the absolute sealing of the passages for the 50 supply of combustible mixture from. the passages for air to be projected, without requiring packings of leather, flbre, asbestos, etc.

On the other hand, the spool I41 is very readily removable, thus permitting increase or reduction oi the caloriflc'power oi the heating i'lame, de-

' 0!, respectively the powder-laden air passing by way of the conduits and II and the passage III of the cock .1. It suilices toiormin the plug I. 01' this cock an additional e, parallel to the III, and corresponding to these parallel passages or to the conduits 25a and II. These arrangements, which are extremely simple, are not represented in the drawing.

It will be understood that, without departing from the principle oimy invention, there may be made modifications to the above described embodiment which do not alter its spirit and am! suitable materials may be utilized for the realization or the invention. Further, the forms represented may be varied subject to the condition of satisfying the conditions indicated and achieving theendinview. Itistobeunderstoodonthe other hand that the various devices provided may be applied either separately or in combination.

For example, the tom of the passages 88 and I or 01' the grooves ill may be varied, notably depending on the method employed to form the same or depending on the direction it is desired to give to their termination at the tip 01' the burner.

What I claim is:

A burner for use in proiecting molten material comprising at least one member having the following conduits and arrangement thereof, a central conduit for the discharge of an air stream holding in suspension particles of the material to be melted, a plurality of gas conduits tor the discharge of a gaseous combustible mixture disposed around said central conduit and terminating at the burner tip in an annular series oi outlet orifices surrounding the outlet orifice oi the central conduit, and a plurality of air conduits through which air may be passed to cool said member and said gaseous combustible mixture, said air conduits throughout a part of their length being located closer to the central conduit than are the gas conduits and then crossing said gas conduits and terminating at the burner tip in outlet orifices which form an annular series surrounding the annular series of outlet orifices oi the gas conduits.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2436335 *Dec 17, 1943Feb 17, 1948Simonsen Leo MSpray device for projecting molten particles
US2530186 *Oct 13, 1947Nov 14, 1950Nathan ArnowPortable spraying apparatus for molten materials
US2645527 *Oct 17, 1950Jul 14, 1953Crowley Republic Steel CorpNozzle construction for atomizing a liquid material by an atomizing gas
US2690929 *Feb 5, 1952Oct 5, 1954Rheem Mfg CoFlame spray apparatus
US2726118 *Jun 22, 1951Dec 6, 1955Schori Metallising Process LtdApparatus for the spraying of pulverulent materials
US2804337 *Feb 28, 1955Aug 27, 1957Columbia Cable & Electric CorpSpray nozzle
US2813750 *Dec 10, 1956Nov 19, 1957Columbia Cable & Electric CorpSpray nozzle
US3062451 *Dec 28, 1959Nov 6, 1962Brennan Lab IncMetal spraying apparatus and method
US3159348 *Mar 12, 1962Dec 1, 1964Minnesota Mining & MfgApparatus for spraying heat fusible pulverulent material
US3393871 *Dec 29, 1964Jul 23, 1968Berk LtdHigh temperature flame spraying pistols
US4632309 *Sep 11, 1984Dec 30, 1986Plastic Flamecoat Systems, Inc.Method and apparatus for spray coating
US4646968 *Apr 17, 1985Mar 3, 1987The Dow Chemical CompanyPrilling apparatus
US5135166 *May 8, 1991Aug 4, 1992Plasma-Technik AgHigh-velocity thermal spray apparatus
US5297733 *Jun 2, 1993Mar 29, 1994Plastic Flamecoat Systems, Inc.Flame spray gun
US5384164 *Dec 9, 1992Jan 24, 1995Browning; James A.Flame sprayed coatings of material from solid wire or rods
US6054178 *Aug 30, 1999Apr 25, 2000Serrot International, Inc.Fabric mesh reinforced monolithic thermoplastic membrane
DE1245813B *Mar 4, 1964Jul 27, 1967Metco IncMundstueck fuer eine Pulver-Flammspritzpistole
DE2743567A1 *Sep 28, 1977Mar 29, 1979Castolin SaBrennerduese fuer flammspritzgeraete
EP0203556A2 *May 24, 1986Dec 3, 1986Stoody Deloro Stellite, Inc.Flame spray method
EP0203556A3 *May 24, 1986Jan 21, 1987Stoody Deloro Stellite, Inc.Flame spray method
U.S. Classification239/79, 239/132.5
International ClassificationB05B7/16, B05B7/20
Cooperative ClassificationB05B7/205
European ClassificationB05B7/20A3