US2097696A

US2097696A - Self cleaning atomizer

Info

Publication number: US2097696A
Application number: US87370A
Authority: US
Inventors: Macdonald Walter
Original assignee: Individual
Current assignee: Individual
Priority date: 1936-06-26
Filing date: 1936-06-26
Publication date: 1937-11-02
Anticipated expiration: 1954-11-02

Description

Nov. 2, 1937.

s Sheets-Sheet i W. MACDONAI D SELF CLEANING ATOMIZER Filed June 26, 1956 Nov. 2, 1937. w. MACDONALD SELF CLEANING ATOMIZER 5 Sheets-Shet 2 Filed June 26, 1956 NOV. 2, 1937. w MACDONALD 2,097,696

SELF CLEANING ATOMIZER Filed June 26, 1936 s Sheets-sheaf. 3

Patented Nov. 2, 1937 2 UNITED STATES PATENT OFFICE SELF CLEANING s'romzsa Walter Macdonald, North Providence, R. I. Application June 26, 1936, Serial No. 87,370

20 Claims. (01. 299-59) 7 My invention relates to atomizers of the self flanged nuts 2| and 22 respectively whose flanged cleaning p o converting a fluid from a liquid portions 23 and 24 engage front and rear end to a vapor, whether accomplished by impact or plates 25 d 25 respectively, turbulence or both. The front end plate 25 has a central opening Certain important objects of this invention are 21 provjded wjth t r 2g A'nozzle 29 5 to provide thoroughly effective automatic means cludes a shank or body portion 80 and a terminal for cleaningthe discharge orifice or passages of flange 3|; The former is provided with a central an atomizer nozzle; to completely clean a passage orifice 32 from which a forwardly directed outfor liquid through the jet, and through an annuwardly flaring cavity 33 extends to the flange. l0 lar passage for air between the Jet. and nozzle The forward portion of the orifice has a cylineach time the atomizer operates; to so dispose drical wall'35, while its rear portion has an annuthe parts as to create in their natural operation lar rearwardly directed tapering recess 36 ex- I an auxiliary pressure through the nozzle in extending from the orifice to the end face 31 of the cess of the initial pressure afforded by the comshank. pressed air, whereby the discharge of the liquidv An axially disposed tubular pipe 42, having an 15 is accelerated when the cleaning members are annular shoulder 44 near its rear end, is threaded, withdrawn; and to eflect all the above results in as at 45, in a, central orifice 41 in theend plate a device of maximum compactness, economic in ,126 of the casing. An extension 48 of this shoulder construction, and containing a single nozzle only. abuts against the rear face of the plate. Adja- Further objects are to facilitate the assemblage cent the extension a' projecting portion 50 of the 20 of the constituent parts of the atomizer; to inholder is provided with an external thread 5| sure the travel of the liquid throughout the adapted to engage a supply pipe for liquid. Inlength of the casing in a non-angular course; to termediate its length the pipe 42 is provided with control and vary the volume of the spray; to longitudinally disposed slots 52 diametrically 0pprevent clogging accumulations around the jet, posite each other. 25 and to shield the latter against injury. A tubular liquid jet 54 carried by the pipe 42 With the above and other objects and advanincludes a shank portion 55 having. threaded entages in view, which will fully appear and be gagement, as at 58, with the forward end of the adverted to in the following description, my inpipe, an inwardly directed intermediate external vention consists in such parts and in such comshoulder portion 51, and a forwardly directed 30 binations of parts as fall within the scope of the stem portion 58. An axial passage .59 through appended claims. o the jet'comprises a rear portion 60 of ample In the accompanying drawings which are a diameter in the shank, a forward portion 6| of part of this specification, and in which is shown less diameter in the St d intermediate a preferred embodiment of my invention, tapering portion 82 in the head, the last men- 35 Figure l is a side elevation of my self cleaning tioned portion forming a conical shoulder or valve atomizer, seat. The stem portion 58 extends centrally Figure 2, a vertical medial section of the same within the orifice 32 of the nozzle 29 thus form in closed'position, a central discharge passage 63 for the liquid, Figure 3, a similar section of the same in open and a resultant annular opening. or passage 64 40 position, around the periphery of the stem for egress of Figure 4, a section taken on line 4-4 of Figcompressed air. ure 3, r 'A cleaning rod 55 for the jet 54 has an enlarged Figure 5, an enlarged fragment of the section body 66 movable in the portion 60 of the axial shown in Figure 1, and passage of the jet; a tip 61 slidable in the portion 45 Figures 6 and 7, perspective views of the tubu- SI of the passage in the stem; and an intermelar cleaning member and jet respectively, diate tapered shoulder 68 adapted to contact with The invention will be described in connection the valve seat 62. The body of the member 55 is \vith'the specific embodimentshown, and it will fixed by a rivet i! or otherwise at its rear end EObe understood that the invention is not to be to the center of an elongated pressure responsive limited by such specific showing except for such element or plate. Ill extending transversely of the limitations as-the claims impart. 'j'et holder 42 with its ends loosely projecting My atomizer includes a casing i5 comprising a through the slots 52. As the width of the element tubular side it whose reduced front and rear is less than the internal diameter of the holder margins are threaded, as at I! and [8, to engage 42 there are-resultant passages II for the liquid spaced from the shoulder portion 51 of the jet holder when the operating parts" are in normal closed position, and a forwardly projecting sleeve 18 integral with the shoulder slidably engaging the tip or stem 58 of. the jet and the cylindrical wall 35 of the nozzle in the annular passage 64 which it normally closes. Integral with the open inner end of the skirt 15 is an external annular shoulder 19 which affords an increased bearing area upon the element 18 against which it normally abuts. The shoulder 16 of the skirt normally contacts with the nozzle 29. A packing ring 8| engages the forward face of the shoulder 19, and a like ring 82 is interposed between the jet shoulder 51 and the cleaning member shoulder 16. N

The jet 54 and cleaning member 14 are disposed concentrically within a compressible resili ent housing 8-1. The latter includes an annular base 85 clamped in rigid engagement with the rear end plate 26 by the cooperation of the nut 22 with the casing side I 8, and is fixed to the rear end of the resilient collapsible body. 81, preferably of metal, to whose forward end is fixed a head 89 normally abutting against the nozzle 29 and provided with a central opening 90 into which .extends the skirt of the cleaning member M. A longitudinal rearwardly directed extension 9|, integral with the head 89 and spaced from the opening 90, contacts with the front face of the element 10, whfle the inner margin of the head is in horizontal alignment with the packing ring shoulder 19 of the member 14.

An inlet pipe fitting 92 has one end threaded in an inlet opening 93 in the side I 6 of the easing, and has an external thread 9| adapted to engage a pipe leading from the source of supply of compressed air for introduction into the single partitionless chamber 95 enclosed by the casing l5.

' When the device is in normal closed or nondischarging position the operating parts disposed as therelnabove described, and as illustrated in Figure2, wherein the passage SI of the stem portion 58 of the jet 54 for the liquidis occupied by the advanced cleaning member 85; and the annular air discharge passage 84 between the nozzle and the stem of the jet is occupied by the cleaning member 14. The cleaning members are positively maintained in their advanced closed positions by the pressure exerted by the expansive action of the spring I2 upon the pressure responsive element 10. I

The liquid is introduced intothe liquid conducting pipe or jet holder 42, which defines the axis of the casing a major portion of the length of the latter, in any convenient manner fromany. convenient source of supply, while air under M pressure is supplied through the, inlet opening 92 of the casing, and acts upon the exterior of the head 89 to compress'the housing 84. As the head' recedes its inner margin engages the packing ring 8| upon the shoulder 19 and withdraws the eleaning member H from the air passage 84, and simultaneously, through the extension 8i and the element 10, withdraws the cleaning member from the passage 6! for the liquid, and moves the shoulder portion 68 of said member from the valve seat 62, thus permitting the free discharge of the air and liquid through their respective passages 64 and SI.

, When the air pressure ceases the head 89 of the housing is moved to its original advanced position under the influence of the resilient body 81, thereby releasing the cleaning member [4, and the element 10 to which the cleaning member 65 is attached, whereupon the spring 12 advances the element HI Which in turn contacts with and advances the member 14, and forwardly impells the member 65, to their original ad vanced occluding positions. Thus the repeated advance of the sleeve 78 of the member 14 cleans the exterior of the jet stem 58 and the cylindrical wall 35 of the nozzle orifice, and the member 65 cleans the interior of the jet stem.

The element 10 has lateral and radial play in the slots 52 in which it slides. Therefore during the above described advance of the cleaning member 65 its tip 61 is insured entrance into the passage 6| of the stem by contact of the free end of the tip with the valve seat 62 of the jet 54.

This automatic or self centering feature dis-.

penses with the necessity of delicate and difficult pre-allgnment of the cleaning wire or member or machining the parts; also enable the employment of a short and space saving member; and avoids the employment of an auxiliary clamping plate.

When the air under pressure is introduced into the chamber of the atomizer the housing is compressed thereby-while the air is also discharging through the air passage 64 of the nozzle thus creating a vacuum in the jet 54 and, because of the slots '52, the vacuum extends to the interior of the housing. The negative pressure or vacuum upon the inside combined with the positive pressure upon the exterior of the housing, set in unison to create a total operating pressure upon the latter greater than the initial pressure of the compressed air, and induces the liquid to accelerate its advance to the point of atomization.

The disposition of the liquid conducting pipe 42 axially of the casing, and within and concentric with the housing member 84, and the concentric and telescoping relation of the clearing member 65, with relation to the jet 54, and the cleaning member 74 with relation to both the jet and the portion ill of the housing head 89, contribute to the compact character of the entire structure, and renders unnecessary transverse partitions as well as liquid and air units angularly disposed with relation to each other.

The mutually concentric .relation of the parts combined with the accessibility thereto by reasonoi' the detachability of all the threaded sections constituting the casing l5 of the atomizer, facflitate the assemblage of the entire structure.

The axial adjustability of the'nozzle relatively 'to the jet furnishes means for determining the nozzle in the casing provided with an orifice for the discharge of air and liquid, an element slidable along the pipe adapted to be moved by the air pressure in a direction away from the nozzle, a jet upon the pipe extending into and in spaced relation to the orifice, a cleaning rod attached to said element constructed and arranged to be moved thereby in a direction toward the nozzle and to close the jet, a cleaning sleeve in the path of said element axially slidable upon the jet and constructed and arranged to be moved by said element in a forward direction to close the portion of the orifice exterior of the jet, and resilient means arranged to oppose the movement of said element occasioned by the air pressure to cause the rod and sleeve to close the jet and orifice upon the cessation of said air pressure.

2. In an atomizer of the type set forth, a casing adapted to receive air under pressure, a pipe for conducting liquid mounted in the casing,'a nozzle associated with said casing provided with a central orifice for the discharge of the air and liquid, an element slidable along the pipe and movable in a direction away from the nozzle by the air pressure, a jet upon the pipe for the discharge of liquid extending into and in spaced relation to the orifice, a cleaning rod connected to .said element and constructed and arranged to be moved thereby in a direction to close said jet, a cleaning sleeve in the path of the element slidably mounted upon the jet, and a resilient means arranged to exert pressurein opposition to the air pressure whereby upon the falling of the 'air pressure the said means will move the element to cause the rod and sleeve to close the jet and orifice respectively.

3. In an atomizer of the type set forth, a casing adapted to receive air under pressure and including a nozzle provided with a central orifice, a liquid conducting pipe disposed axially of the casing, a jet for the liquid mounted upon the pipe and extending into and in spaced relation to the orifice, an element slidable along the pipe and movable thereon in a direction away from the orifice by air pressure and movable towards the orifice by resilient means, a cleaning member carried by said element slidable in the jet and normally closing the same, and a cleaning member slidably mounted upon the jetin the path of the element and constructed and arranged to enter the space between the orifice of the nozzle and jet. 4. In an atomizer of the type set forth, a cas ing adapted to receive air under pressure, a pipe for conducting a liquid fixed in the casing axially thereof and provided with diametrically opposed longitudinal slots, an element responsive to air pressure of less diameter than the bore of the pipe extending through the slots and longitudinally movable therein, a nozzle in one end of the casing in alignment with the pipe and provided with an orifice, a jet upon the pipe extending into and in spaced relation to the orifice, a cleaning member fixed to an intermediate portion of the element slidable in the jet and normally closing the jet, a second cleaning member slid-,

ably mounted upon the jet normally contacting with the element and closing the portion of the orifice. exterior of the jet, a spring surrounding the pipe and engaging the side of the element remotefrom the nozzle for maintaining the cleaning members in closed position when the air pressure is discontinued, and a compressible housing concentric with thepipe and including an annular base engaging the opposite end of the casing from the orifice, a body surrounding the pipe, and an annular head engaging the second cleaning member.

5. In an atomizer of the type set forth, a casing adapted to receive air under pressure and including a front end and a rear end, a nozzle in the front end of the casing provided with a central orifice for the discharge of the air and liquid, a pipe for conducting liquid fixed in the rear end of the casing, a jet upon the end of the pipe having a stem extending into and in spaced relation to the orifice and-provided with an intermediate external shoulder, an element slidable along the pipe and rearwardly movable responsively to the action of air pressure, a

spring upon the pipe for advancing the element,

a cleaning member upon the element slidable in the jet to close the same, and a cleaning member in the path of the element comprising a skirt slidable upon the body of the jet, an intermediate shoulder engageable with the shoulder upon the jet, a sleeve slidable upon the stern of the jet to close the portion of the orifice be.- tween the nozzle and jet, and air pressure means for moving the sleeve away from its closed position.

6. In an atomizer of the type set forth, a casing including a tubular body, a front end plate, a rear end plate, and flanged nuts detachably engaging the plates with the body, each of said plates having a central opening provided with a thread, an inlet in the body for admitting air under pressure, a liquid conducting pipe provided with a thread detachably" engaging the thread in the rear end plate, a nozzle provided with a thread detachably engaging the thread in the front end plate and provided with a central orifice to permit the discharge of air and liquid, ajet upon the pipe extending into and in spaced relation to the orifice, an element slidable along the pipe movable in a direction away from the orifice by air pressure, a spring concentric with the pipe for moving the element towards'the orifice, a jet cleaning member upon the element slidable in the jet under the influence of the spring to close the jet, a nozzle cleaning member slidably mounted upon the jet normally in contact with the element and constructed and arranged to slide into the portion of the orifice exterior of the jet, a head slidably mounted upon of air under pressure and including a front end.

and a rear end, the front end having a central opening provided with a thread, a nozzle in the opening provided with'a thread engageable with the first mentioned thread and provided with a central orifice for the discharge of air and liquid, a pipe for conducting liquid supported in the rear end of the casing, a jet upon the end of the pipe extending into the central portion of the orifice, an elementslidable along the pipe and rearwardly movable thereon by air pressure, a resilient means upon the pipe adapted to advance the element towards the nozzle, a cleaning member upon the element slidable in the jet to close the jet, a cleaning member in the path of the element slidably mounted up'onjthe jet and constructed, and arranged to slide into the orifice in contact with the jet and nozzle when the element is advanced, and compressible means actuated by the air pressure for moving the cleaning members away from their advanced positions.

8. In an atomizer of the type set forth, a casing provided with an inlet for the admission of air under pressure and including a front and rear end, the front end having a central opening provided with a thread, a nozzle in the opening comprising a body portion and a terminal fiange, saidbody portion being provided with an external thread engageable with the first thread, with a central orifice for the discharge of air and liquid, an annular outwardly tapering rearwardly directed recess extending from the orifice to the end face of the body portion, and with" a forwardly directed outwardly flaring cavity extending from the orifice to the flange, a pipe for conducting liquid fixed in the rear end of the basing, a jet upon the end of the pipe extending into the central portion of the orifice, a cleaning member slidably mounted in thejet forwardly movable to close the jet, a cleaning member slidably mounted upon the jet and forwardly movable to close the portion of the orifice gaging the element and adapted to engage the second cleaning member and actuated by the air pressure for retracting the spring to open the jet and for withdrawing the second cleaning member from the orifice.

exterior of the jet, resilient means for advancing v the cleaning members to close the orifice, and air pressure means for moving the cleaning members away from their closed positions.

9. In an atomizer of the type set forth, a casing. adapted to receive air under pressure, a nozzle in the casing provided with an orifice for the discharge of airand liquid, a liquid conducting pipe disposed axially of the casing, a jet for the liquid mounted upon the pipe and disposed centrally of the orifice, an element slidable along the pipe and movable towards and away from the orifice, a cleaning member attaohed to the element and slldably mounted in the jet to enter the orifice when the element is moved towards the orifice, a tubular cleaning member contacting with the element and slidably mounted upon the jet to also enter the orifice when the element is moved towards the orifice, and compressible means actuated by the air for moving the element away from the orifice, and resilient means for mutingthe element towards the orifice.

10. In an atomizer of the type set forth; a casing adapted to receive air under pressure, a nozzle in the casing provided with an orifice for the discharge of air and liquid, a pipe for conducting liquidmounted in the casing, a jet upon the pipe extending centrally of the orifice, an element slidable along the pipe, a cleaning member upon the element normally closing the jet, a second cleaning member normally contacting the jet and the nozzle, aspring engaging the element to maintain the cleaning members in closed positions, and compressible means engaging the element and adapted to engage the second cleaning member and actuated by the air pressure for retracting the spring to open the jet and for withdrawing the second cleaning member from the orifice. v

11. In an atomizer of the type set forth, a casing adapted to receive air under pressure, a nozzle in the casing provided with an orifice for the discharge of air andliquid, a pipe for conducting liquid mounted in the casing, a jet upon the pipe extending centrally of the orifice, an

12. In an atomizer of the type set forth, a casing provided with an air inlet for the admission of air under pressure and including a front end and a rear end, a nozzle mounted in the front end provided with a central orifice for the discharge of air and liquid, a pipe for conducting liquid fixed in the rear end of the casing, a jet upon the free end of the pipe in the central portion of the orifice, an element slidable along the pipe, a cleaning member attached to the element and slidable in the jet to close the jet, a second cleaning member in the path of the element slidably mounted upon the jet and normally registering in the portion of the orifice around the jet, a "spring upon the pipe engaging the element for maintaining the cleaning members in closed position when the air pressure is discontinued, a compressible housing surrounding the pipe, the spring, and theelement, including an annular base fixed to the rear end of the casing, a compressible resilient side, an annular head slidably engaging the second cleaning member, a lateral shoulder upon the second cleaning member adjacent the element and in the path of the head and an extension upon the head engaging the front of the element, said housing being adapted to be compressed responsively to the action of the air to withdraw the cleaning members from the member normally closing the portion of the orifice exterior of the 'jet and movable in a'direction away from thewnozzle, air pressure means for is removed.

moving the cleaning member away from its closed position, and means for maintaining the cleaning member in closed position when-the air'pressure 14. In an atomizer of the type set forth, a casing adapted to receive air under-pressure, a pipe for conducting liquid mounted in' the casing, a nozzle associated with said casing provided with a central orifice for the discharge of the air and with the element and closing the orifice between liquid, a jet connected with the pipe for the discharge of liquid and extending into and in spaced relation to the orifice, a cleaning member normally closing the portion of the orifice exterior,

of'the jet and movable in a direction away from the nozzle, air pressure means for moving the cleaning member away from its closed position, and resilient means forurging the cleaning member to closed position.

15.'In an atomizer of the type set forth, a casing adapted to receive air under pressure, a nozzle associated with said casing provided with a central orifice for the discharge of air and liquid, a 'jetfor the discharge of liquid mounted in the casing and annularly spaced relatively to the orifice, a cleaning member mounted upon the jet and movable thereon in opposite directions for alternately closing and opening the annular space, resilient means for moving said member in one direction, and air pressure means for moving said member in the opposite direction.

16. In an atomizer of the type set forth, a casing adapted to receive air under pressure, a nozzle associated with said casing provided with a central orifice, a jet for the discharge of liquid mounted in the casing and annularly spaced relative to the orifice, whereby an annular opening is provided about said jet for the discharge of air, and means mounted in said casing and movable into said annular opening to the point of discharge of the jet for cleaning said annular opening.

1'7. In an atomizer of the type set forth, a casing adapted to receive air under pressure, a nozzle associated with said casing provided with a central orifice, a jet for the discharge of liquid mounted in the casing and annulalrly spaced relative to the orifice, whereby an annular opening is provided about said let for the discharge of air, and cleaning means mounted in said casing and normally closing said annular opening and movable away from said opening in response to pressure of the air during operation of the atomizer.

18. In an atomizer of the type set forth, a casing adapted to receive air under pressure, a nozzle associated with said casing provided with a central orifice, a let for the discharge of liquid mounted in the casing, extending throughout the length of the orifice, and annularly spaced relative to the orifice, whereby an annular opening isprovided about said jet tor the discharge of air, and means mounted in said casing and movable lengthwise throughout the length of the jet and of said annular opening for cleaning said annular opening.

19. In an atomizer of the type set mm, 'a.

casing adapted to receive air under pressure, a nozzle associated with said casing provided with a central orifice, a jet for the discharge oi! liquid mounted in the casing and annularly spaced relative to the orifice, whereby an annular opening is provided about said jet for the discharge of air, and means mounted in the casing slidably of and provided with longitudinal slots, a nozzle in the front end of the casing provided with an orifice, an element of less diameter than the bore of the pipe extending loosely through the slots and longitudinally movable therein by air pressure in a direction away from the nozzle, resilient means upon the pipe adapted toadvance the element towards the nozzle, a tubular Jet fixed 'to the pipe provided with a tapering internal shoulder intermediate its length and extending into and in spaced relation to the orifice, a cleaning member slidable in the jet to close the same fixed to said element and provided with a tapering shoulder adapted to register with the first shoulder, a secondcleaning member slidably mounted upon the jet in the path of the element and normally closing the space formed in the orifice, air pressure means ior moving the secondcleaning-member in a direction away from the orifice, and ai'hiiiising" surrounding the pipe including an annular base secured to the rear end 'of the casing, a compressible body secured to the base, and a head slidably engaging the second cleaning member.

WALI'ER MACDONALD.

'DJS CLAIM ER 2,097,696.Walter Macdomld, North Providence, Disclaimer filed June 28, 1939, byv the Patent dated November 2, 1937.

R. I. Saw CLEANING Aromznn.

inventor; the assignee, American Moisten'ing Company, agree ng and consenting.

Hereby enters this disclaimer to

claims

13, 14, 16, and 17 of said'LotterB Iatent.

[Ofiic'ial Gazette July 25, 1939.]

for alternately closing and opening the annular space, resilient means for moving said member in one direction, and air pressure means for moving said member in the opposite direction.