USRE20425E - Atomizes for materials in powder - Google Patents

Description

F. SCHORI AToMizER FOR MATERIALS 1N POWDER FORM y 7 3 9 1 2 2 e Y n u .J

Original Filed Jan. 6, 1927 2 Sheets-Sheet l u iNvENToR AT1" RNEYS F. SCHORI ATOMIZER FoR MATERIALS IN POWDER FORM Jum- 22., 1937.

2 Sheets-Sheet 2 Original Filed Jan. 6, 1927 [NVENTOR Reissued .lune 1937 ATOMIZEB FOR MATERIALS INPOWDEB FORM Fritz Schori, Wetzikon, Switzerland- Ol'ig'lllal N0. 1,781,603, (13M November-11, ,1930,

Serial No. 159,490, January 8, 1927.

Application for reissue March 23, 1935, Serial No. 12,700. In Switzerland October 5, 1926 ''he invention relates to atomizers for mate-- rial in powder form and more particularly to apparatus for spray-coating surfaces with metallic or fusime material supplied as powder and atomized in a spray of gime by which it is melted and projected onto thelirface to be coated. It consists in a special manner oi' feeding the powder rto the flame oi' the atomizer to keep its rate of supply steadily constant with the generation of heat by the flame, thereby giving superior coating results at enhanced speed. -To this end the invention consists in causing the ow of one of the fluid components of the spray or name, in passing through the atomizer. device or pistol, to generate a suction eil'ect therein, and in utilizing such suction to produce an air current flowing through a suitable feed conduit from the powder-containing receptacle to the pistol, the air to i'orm such current being sucked into the .20 suction conduit through an entrance hole or holes located adjacent to the receptacle but outside of the mass oi' powder therein, so that the air current ows to the plstolhat a rate which is constant, being determined solely by the suction 5 'and the size of the air entrance, and is independent of and unaffected by the amount of powder that may be present in the receptacle and does not aii'ect that powder as by depositing moisture of condensation thereon, which would tend to 30 make it lumpy. Into this air current the powder 35 caliber and at a constant rate.

is delivered from the receptacle by its own gravity, assisted by mechanical means if necessary, through a passage of predetermined but adjustable caliber and enters only as permitted by that The e'ect of the steady delivery of powder to the steady current of conveying air is to ieed the powderto the atomizer at a rate which is also steady and always constant to the rate oi' ow to the pistol of the combustion re-agents and hence to the heat generated. Thereby overheating and vaporizationof the powder is prevented on the one hand and underheating and insuihcient vfusion of it. on the other. Such balance of powder feed and heat continues permanently after an initial adjustment because the air in the suction con-f duit is constant with the steady llame and the powder feed is also constant, ,being under the force oi gravity, as stated.

The invention further includes a screen guard against the passage o! oversized particles to the conveyingair current and also a shaking means whichiorestalls bridging-or clogging at `or above the powder discharge outlet and assists and promotes the screeningaction` in the branch I5'.

'mitting the metallic powder to pass through Constructional examples of the subject matter of the present invention are illustrated on lthe acf companying drawings, in' which:

Fig. 1 shows the complete arrangement by an operator for metal coating, l

Fig. 2 shows the two prominent parts oi the apparatus, i.y e. the receptacle and the hand apparatus in elevation,

Fig. 3 shows the lower portion oi receptacle in elevationand with parts shown in section,

used

10 y Fig. 4 shows the pistol in a vertical section and Fig. 51s a modification of the lower part of the receptacle. y i

In the casing I of the hand-apparatus (Fig. 4)

having a'handle I' a piece 2 is inserted provided 15 with a channel. 22 and an extension, the latter together with the' wall ofthe casing forms a.

nozzle and is secured in position by a screw plug 26. The nozzle is provided with an annular space-4 which by an annular gap at the free end of the extension 3 is in connection with an atomizing chamber Il formed by the interior lof a tube III'. The latter is screwed into a. sleeve 2B, which serves for partly deiining the annular space l as .Well as a space 29 present in the casing I. Flirtheral sleeve 30 is screwed into the casing, said sleeve secures in its position by means of an extension the sleeve 28 and is provided with concentric channels 30'. To the inserted sleeve 30 the nozzle 9 of the burner is screwed. AA channel 8 is provided in the handle I andfleads to the space 29 of the casing I, a channel 5 in the handle is in communication with the space 4 and a chan- 'tapers and is provided with a connecting 'branch I5. The latter is provldedvwith a cock 33 and with an adjusting screw 34 adapted to control the cross-sectional area oi' the channel provided Inside the vreceptacle I5 a cylindrical' sieve 3B is placed above the bore of the branch I9', the perforations of the sieve perthem, To the channel Il of the'handle I".hose 36 is connected serving to supply a combustible gas for instance from a gas bottle I5 carried on a portable air compressor plant 46" (Fig. 1). A hose Il connected to the. channel I oi' the handie t' serves to supply a pressure medium, for 55 instancecompressed air supplied from a container l1 of the compressor plant II (Fig. 1). By means of a further hose designated I8 compressed air (for instance from the container I1 Fig. 1),isled by a branch n into a casing Il providedon thereceptacle Il, in which casing a wheel 4I providedwith recesses on its circumference to act as blades is arranged. To the top wall, which is xe'd to the receptacle I5 andprovided with a closable opening for iilling in c the metallic powder, two shoulder strapsV 42 are connected. Rings 43 provided on the receptacle serve for ilxing the straps 42 the length of whichl is adjustable (by means oi a button and slots); one of the straps is threaded through one ofthe rings and the other is provided with a` hook Il adapted to cooperate with the second ring. The receptacle I5 may be conveniently carried on the back of the operator, the two straps 42 passing over his shoulders. y

In using the atomizer the current of compressed air from the hose 31 flows through the channel I of the handle I' of the hand-apparatus to the annular space I and through the gap between the extensions l and the parts Il' and 28 into the chamber Il and then into the open. The passage of the current of Vcompressed air through the gap causes a continuous suction action which is transmitted by the channels 22 and II. the hose I1 and the branch I8' to the lower end of the receptacle I5, whereby metallic powder is continuously conveyed by `suction action through II, I1, 3l, 22. Air entrance holes I5" provided in the branch I5 permit the access of atmospheric air into the suction conduit. 'Ihe iet of powderous material issuing from the channel 22 is very iinely atomized inside the chamber Il by the annularA current of compressed air intersecting the former jet at an acute angle. The atomized powder gets then into the meltin g ilame issuing from the burner nozzle 9 and is projected against the facing to be coated. The

melting ame is fed with the gassupplied to the nozzle by the hose 36 and iiowing through the channel I, the space 29 and the channels 30' of the inserted sleeve l.. By means of the compressed air flowing through the hose 38 into the casing 40 on `the receptacle I5 and out of the casing by the exit opening 4l the turbine wheel II is caused to rotate whereby a certain vibra'.- tion oir the receptacle is effected; the vibrating or shaking action on the receptacle I5 is further increased in that the mass of the turbine wheel 4I is not balanced, holes I'I' being provided in one-half of the wheel. On account of this shaking eiiect on the receptacle I5 the formation of ajcompact column of powder, which is apt to take place when very ilne and somewhat moist powder is contained in larger quantities in the receptacle, is prevented. By means of the cock l2 arranged in the handle I oi the hand-apparatus the current of the compressed air and of the combustible gas may be throttled or completely cut ofi. By turning'the handlel 23' of the cock 33 provided in the branch IB'- of thereceptacle I5 the stream of metallic powder may be cut on.

Fig. 5 shows a modiiied construction ot the discharge branch II provided on the receptacle I5 which diil'ers from that shown in Fig. 3 in that instead of the cock 33 and the regulating screws Il an adjustable nozzle is provided for iniiuencing the discharge of the metallic powder. The nipple ll, to which the hose I1 is to be connected is screwedl to a member l! which in its turn is ially displaced against the end` of the extension III whereby the cross-sectional area of the nozzle may be regulated or cut on' ifV desired. A Aspring loaded bali52 mounted in the member 4l is Yadapted to cooperate with recesses arranged in the extension 5l to secure the elements 4l Aand Ii' in their adjusted positions. Openings l.' are provided to admit atmospheric air to the suction .conduit lbelow the valve formed by Il and Il, as "in Fig. 5.

' Obviously the above described examples o! the atomizers make it possible to have a good stock lof the material to be atomized at the working place without' increasing the load on the hand o! the operator handling the pistol so that the free movability of the operator is ensured.

The above described atomizer may also be used for atomizing andv producing a coat ot non-metallic materials in powder form.

' I claim:

1. An arrangement (or 'atomizing materials and particularly materials in powder form, comprising in combination, a portable receptacle adapted to take up a stock of the material to be atomized, a'ilame-spraylng hand-apparatus containinggfuel-ieeding means and a nomle. means to supply a medium under pressure to said nozzle of the hand-apparatus whereby a suction action is generated, conduit means connecting the lower end of said receptacle to said handapparatus for conveying the material to be at,

\ omized from said receptacle to said hand-apparatus bythe suction action of said nozzle by which itis atomized by the same pressure medium which generates the suction, a casing attached to said receptacle, a turbine wheel enclosed in and rotatably mounted in said casing, and means to supply a pressure medium to said casing for causing a rotation of said turbine wheel and to impart thereby vibrations to said receptacle ln order to prevent clogging ot the material to be atomized.

2. In a` sprayingapparatus, a flame-spraying device comprising a casing, a nozzle therein, means to supply suspended metal to said casing, a tube in alinement with and spaced from said nozzle to form a suction chamber therebetween. said tube extending substantially to the outer end of said casing, means to supply atomizing air to vthe chamber andvtube for combustion, a sleeve surrounding said tube and having longitudinal passagesl therein concentric with said tube, means to supply a combustible gas to said passages, said gas being discharged between the tube and casingV and being burnt at the outer end of the casing in contact with the atomizing air, said means to supply suspended metal including an air hose connected to said suction chamber, and means to continually shake the receptacle during operation.

3. Coating apparatus comprising a hand spraying device or pistol containing uid passages for conducting and spraying a plurality of tiuids.- one of said iluids being a fuel suited to form a flame and one of said fluids carrying suspended therein a fusible powder to be melted by said `iiame to form the coating, a suction producing device in said pistol comprising a chamber in one ot said iluid passages wherein the velocity ot 7 the iluid produces a suction etlect, and a receptacle for containing a body of such powder, in combination with means for transporting the powder from the receptacle to the pistol comprising a suction conduit, said conduit excluding said receptacle and being subject at one end to the suction eiect of said suction-producing device in the pistol and having at its other end an entrance removed from said body o! powder, through which and said conduit a conveying gaseous current is maintained by the suction unafiected by and not ailecting the body of powder in the receptacle, and means for discharging the powder at a constant rate from said body into said current, whereby said powder is conveyed to the pistol at a rate constant with the combustion of said iiame.

4. Coating apparatus comprising a hand spraying device or pistol containing fluid passages for conducting and spraying a plurality of fluids, oneA oi' said fluids being fuel gas adapted to form a flame and one of said uids carrying suspended therein a fusible powder suited to be melted by such name to form the coating, a suction-producing device in said pistol comprising a chamber in one of said uid passages wherein the velocity oi.' the iluid produces a 'suction eiiect, and a receptacle for containing a body e of such powder, infcombination with means for feeding the powder from the receptacle to the pistol comprising a suction conduit said conduit u iluctuating rate from said body into said conveying current, and means for vconforming said Arate to the rate of ilow oi fuel gas to said name. 5. Coating apparatus comprising a hand spraying device or pistol containing iluid pas.

sages for conducting and spraying a plurality of iluids. one of said iluids being a fuel gas adapted to form a flame and one of said fluids carrying suspended therein a fusible powder suited to be melted by the flame to form the coating, a suction-producing device in said pistol comprising a chamber'in one of said uid passages wherein the1 velocity oi the liluid produces a suction eiect, and a receptacle for containing a body oi' such l powder, in combination with means for feeding the powder from the receptacle to the pistol comprising a suction conduit, said conduit excluding said receptacle and being subject at one end .to the suction eilect of said device in the pistol and having at its other end an entrance removed from said body of pow'der through which and said conduit .a conveying gaseous.

current is maintained by ,suction in said conduit unaffected by a'nd not ail'ecting the body of the powder in the receptacle, a gravity discharge passage from thereceptacle to said conveying current, and means for agitating the powder enadapted to conductA and spray a plurality of unich. one of which is a fuel gas to form a name land one of which carri suspended therein a fusible powder suited to be melted by such name to form the coating. one oi said-passages including a device whereby the iiuid velocity creates a suction eifect. and a receptacle for containing a supply of such powder, in combination with means for feeding the powder from the receptacle to the pistol comprising a suction conduit, said conduit excluding said receptacle and being subject at one end to the suction effect of said device in the pistol and having at its other end an entrance removed from said powder throughvwith said passage and means for shaking said screen and passage.

. 7. Coating apparatus comprising in combination, a hand llame-spraying device or pistol, exible tubes supplying the same with air and with fuel gas suited to form the flame. an air" passage in said piston including a' suction-producing device comprisinga chamber in which the air iiow produces a suction effect, a-reoeptacle for containing a supply oi' a fusible powder suitable to form a coating, and means for feeding such`powder from the receptacle to the pistol comprising a hose connected to the pistol at one end and subject to the suction eilect of said device in the pistol and connected at its other end with the bottom of said receptacle, an air entrance at the latter end of said hose removed from said supply ol' powder whereby a conveying air current is maintained by the suction, the path of said current being exclusive of the mass of the powder in the receptacle, a gravity discharge passage leading from said receptacle to the path of said conveying current, and a valve for said' passage to control the rate of powder ow therethrough.

8. Coating apparatus comprising in combination a hand flame-spraying device or pistol, ex'

ibletubes supplying vthe same with air and fuel under pressure. an atomizing tube in said piston to deliver the air, a passage surrounding said tube to deliver the fuel, means for simultaneously controlling the iiows throughsaid tube and iuel passage, a receptacle for containing a supply of a fusible powder suitable to i'orm a coating, and means for feeding such powder from the receptacle to the pistol comprising a hose connected to the pistolat one end and subject to suction induced in said atoming tube by the air iiow thereinto. and connected at its other end' with said receptacle. an air entrance at the latter end of said hose removed from said supply of powder whereby a gaseous conveying current is maintained in said hose ilowing into said atomizing tube the path of said air current excluding the linterior of said receptacle. and a gravity discharge passage leading from' said receptacle to the path of said conveying current, said powder being projected from said tube surrounded by the burning lfuel projected from said iuel passage. Y

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