Патент USA US2132826код для вставки
Oct. 11, 1938. J_ E_ LUDWlG 2,132,826 SPRAY BOOTH Filed April 15, 1956 INVENTOR. L/UHN E. LUDWIE' BY ATTORNEY7 2,132,826 Patented 0a. 11, 1938, _" UNITED STATES PATENT OFFICE ’ 2,132,826 SPRAY BOOTH John E. Ludwig, Detroit, Mich., assignor to New comb corporation DavidofCompany, MichiganInc., Detroit, Mich., a Application April 13, 1936, Serial No. 74,228 9 Claims. (CI. 91-60) My inyention pertains to a paint spraying lustrate the construction of such a booth in accordance with my invention; booth for, installation in buildings where auto Fig. 2 is a side elevational view thereof partly mobile ‘es, furniture and other articles are sprayed with paint, varnish and the like. It is an object of my invention to provide a paint spraying booth comprising an improved ventilating system whereby the ventilating air is admitted into the booth and directed there through in such a manner that a smooth flow of 10 air is provided whereby eddys are eliminated and the poisonous paint infected air is carried stead ily away from the attendant who is doing the spraying and the spray is properly carried to and around the object to be sprayed for depos iting a suitable layer of paint or varnish thereon. Another object of my invention is to provide a paint reclaiming spraying booth comprising means for exhausting air from the booth and efficiently depositing and preserving the waste 20 paint spray until it can be salvaged while pre venting the paint spray depositing and hard ening on adjacent baffle surfaces from which it could not be efficiently salvaged. It is also an object of my invention to provide a semi-closed ventilated paint reclaiming spray booth especially suitable for installation in a factory room for receiving articles to be sprayed therethrough and having an exhaust air out let adjacent the floor at one side of the booth, 80 a main air inlet entering through the roof at the opposite side of the booth through an inlet provided with a baiile de?ecting plate for di recting the inflowing air away from the oper ator and toward and around the sprayed article 35 and, toward the exhaust outlet and also com prising a high velocity air inlet projector for projecting a sheet of air downwardly adjacent the oppositeside of the article being sprayed and toward the air exhaust outlet adjacent the bottom of the housing. It is a further object of my invention to pro vide an improved method of operating a semi closed spraying booth in a factory room. The invention itself, however, both as to its‘ 45 construction and its method ‘of operation, to gether with additional objects and advantages thereof will best be understood from the follow ing description of a speci?c embodiment, when read in conjunction with the accompanying 50 drawing, where like reference characters refer to similar parts throughout, and in which: Fig. 1 is a side elevational view of a ventilated paint reclaiming‘ spraying booth with portions 55 broken away and sectioned to more clearly i1 in section on the line 2-2 as shown in Fig. 1; and Fig. 3 is a fragmentary sectional view illus trating a detail thereof. 6 Referring more particularly to Fig. 1 of the drawing, my invention comprises a spraying booth inclosed by a front wall I and a rear wall 10 3 and joined overhead by a roof 5. The ends of the booth are partially closed by end wall pox‘. tions ‘I and 9 which are spaced apart su?lciently to provide a doorway ll therebetween through which the automobile bodies or other articles to be sprayed may be transported in any suit able manner as on an endless conveyor (not, shown). The front wall I of the booth is pro vided with a doorway l3 through which the at tendant may enter and adjacent which he stands while spraying the objects which are transported between doorways H in the ends of the booth. The doorway l3 in the front wall also aids in ventilating the booth. For ventilating the booth and exhausting paint 25 laden air therefrom, I provide a cupola l5 which is mounted above the roof 5 and comprises sloping gable portions i'l'which rise above the roof 5 of the booth and which may be integral therewith or secured thereto in any suitable manner. The portion of the roof 5 upon which the cupola i5 is mounted is suitably apertured to permit the free circulation of air there through from the booth into the cupola and an exhaust conduit i9 is connected from a cir 35 cular port 2i in the apex of the cupola. The ex haust conduit i9 is connected to the inlet of an exhaust fan 23 which is operated by a suit able electric motor 25. From the outlet of the exhaust fan, a conduit 21 is connected for trans- 40 mitting the exhausted air from the building in which the booth is installed. For guiding the ?ow of air from the booth and reclaiming the ?nely divided paint and spray which is carried by the air, conduit means is 45 provided within the booth for connecting from the cupola to a point adjacent the lower por tion of the booth. This connection is established through interconnecting conductive means com prising a. verticle plate 29 connecting down- 50 wardly from the roof of the booth directing under the front edge of the cupola, and enclos ing a space between the plate 29, the end walls and the rear wall 3 of the booth. In this en closed space, I provide a water eliminator which 55 8,189,886 comprises a plurality of spaced plates 3i which voir through the spray nozzles 41 instead of comprise reversely bent portions which, as shown taking water from an external source and con more clearly in Fig. 2, are spaced for passing tinuously draining water from the reservoir and the exhaust air therebetween. From the lower‘ thus wasting a portion of the reclaimed material. edge of the plate 29, I-pivotally support a water For this purpose, I provide a suitable motor de?ecting plate 33 on a horizontal pivot bar 34 operated pump 49 which draws the water from supported between the end walls of the booth.\ the reservoir through its inlet conduit II and In normal operation, the plate 33 ls held by the \ forces it out through its discharge.conduit 33 exhaust suction in its closed position as shown. under suitable pressure into the nozzle 41 in 10 However, a lever 35 is pivotally mounted on a pin 31 on the end wall of the booth whereby the position of the pivoted water de?ecting plate 33 may be adjustably controlled as desired by turning the lever to the position indicated by the dotted lines 33. Mounted upon the rear wall 3 of the booth, I provide four air flow conducting conduits 39, the upper ends of which are adapted to be oper atively engaged and conductively connected to 20 the exhaust cupola when the pivoted plate 33 is drawn toward the rear wall 3 of the booth in adjacent abutting relation, as shown. The air in the booth is then drawn from the booth into the lower ends of the vertical conduits 39, 25 as indicated by the dotted arrows. To provide a closely con?ned air flow through the four vertical tubes 39, I provide a front baiile plate 4| which is secured across the booth adjacent the front sides of the four vertical conduits 39 in 30 any suitable manner. The lower edge. of the baille pTate 4| is curled gently toward the rear of the spray booth to provide for smoothly guid ing the air under the ends of the vertical con duits. A bottom plate 43 connects between the 35 lower ends of the conduits 39 and extends across the booth adjace the front sides of the lower ends of the condui s where it also connects with the lower edge of the baffle plate 4| which is thus supported in a slightly inclined position. The bottom plate 43 also extends around and be tween each of the conduits 39 to restrict the air ?ow therebetween. For reclaiming the larger particles of the paint and varnish carried downwardly in the booth by the spray, I provide a water reservoir 45 on the -?oor in the booth adjacent its rear wall 3. As the air is drawn under the curled lower edge of the plate 4|, it passes adjacent the upper sur face of the water in the reservoir and thence turns upwardly into the conduits 39 and cen trifugal force causes the larger particles in the air to be deposited in the water. The deposited paint or varnish material settles in the water which retains it and preserves it in a convenient 55 condition for reclamation. The reclaimed ma terial is thus prevented from lodging and drying hard and it may be conveniently salvaged as by shoveling from the bottom of the reservoir. In order to emciently recover the more ?nely 60 divided particles of the paint and varnish which passes over the water reservoir and upwardly into the vertical conduits 39, I provide each con duit with a double opposed spray nozzle 41 which projects two cones of evenly divided water spray 65 upwardly and downwardly in each conduit. The ascending air in the exhaust conduits 39 is com pletely deluged by the water sprays projecting into each conduit in the form of two opposed cones, and the finely divided particles paint 70 and varnish are removed and carried do ward ly into the water reservoir where it is properly preserved and may be conveniently removed later. For more effectively reclaiming the material, 75 I preferably recirculate the water from the reser thevertical exhaust conduits. 10 In order to effectively ventilate the spray booth adjacent the attendant for carrying the ?nely divided spray away from him and to avoid eddys in the air flow which would tend to carry the poisonous fumes back to the attendant and also 15 to aid the attendant in properly applying a smooth coat of paint or varnish upon the ob ject, I provide means for supplying a prede termined quantity of intake air to the booth under forced circulation. The greater volume 20 of this air is admitted to the booth from an inlet housing 31 which is mounted upon the front por tion of the roof 3 of the booth. The lower por tion of the inlet housing 51 is opened for direct ing air into the booth and it is provided at its front edge with a large baffle plate 59 which ex tends across the booth and is inclined down wardly for directing the greater volume of air toward and over the object to be sprayed and, toward the exhaust outlet. The intake air is 30 supplied to the inlet housing through a conduit 6| connecting from a large air inlet conduit 33 which connects from a pressure intake fan 63 which may be operated by a suitable electric motor, as will be readily understood. From the large inlet conduit 63 a portion of the inlet air is divided oil’ through a small pipe 61 which connects into a small inlet housing 99 mounted on the central portion of the roof I of the booth. From the small inlet housing 89 on the roof of the booth, a high velocity air inlet projector extends downwardly into the booth comprising a pair of spaced air de?ector plates 1| and 13 projecting downwardly into the booth and inclining toward the rear wall thereof. The air projector plates ‘II and 13 extend across the spray booth between the end walls 9 and define a narrow air projecting slotv for projecting a narrow sharply de?ned stream or sheet of air 13 downwardly adjacent the rear side of the object being sprayed and toward the water reservoir as indicated by the small arrows. Opening from the air inlet conduit 9|, I pro vide a factory by-pass nozzle 11 which may have an air ?ow controlling damper 19 therein for projecting a portion of the in-take air directly 56 into the factory room where the spray booth is installed. The air inlet conducting conduits and the high velocity projector and the factory re turn nozzle are so constructed and adjusted that with the pressure in-take fan and the exhaust fan adjusted for handling equal volumes of air, one-fifth of the inlet air passes out through the factory by-pass nozzle and the other four-fifths is divided between the inlet conduits 3| and 31 connecting into the booth. For example, the ex haust fan is preferably set to handle ten thousand cubic feet of air per minute, the inlet fan is set for delivering the same volume, and the damper control nozzle which discharges into the factory is adjusted to discharge approximately two 70 thousand cubic feet per minute. Thus while the exhaust fan will be pulling out ten thousand cubic feet per minute, only eight thousand cubic feet per minute‘will be supplied by the down 75 2,188,896 wardly directed currents of air directed into the booth through the inlet conduits 3| and“, and the additional two thousand cubic feet of air per minute must be taken from the factory room. In operation, the air ?ows smoothly down and around the object to be sprayed as indicated by the dotted arrows, thus eliminating eddies, car rying the poisonous spray steadily away from 10 the attendant and aiding him in properly sup plying a smooth coat to the object being sprayed. As the air passes downwardly toward the water reservoir 45 on the ?oor, gravity aids the air ?ow in carrying the particles of spray toward the sur 15 face of the water. As the air passes under the low er curved edge of the de?ector plate 4| centrifu gal force causes the larger particles of the paint to be thrown into the water. As the air passes upwardly into the vertical exhaust conduits 39, 20 it is thoroughly washed by the double cones of water sprayed into the conduits by the double op posed nozzles 41 therein. Since all the exhaust air must pass upwardly through the conduits, all the ?nely divided paint and varnish is effectively 25 reclaimed and washed down into the water res ervoir where it is preserved until it can be con veniently reclaimed as by shoveling it off of the bottom of the reservoir._ As the air continues upwardly, it passes between the water eliminator 30 plates 3| where the water is effectively deposited and the exhaust air which passes out through the exhaust conduits l9 and 21 does not carry an excessive amount of water away from_the ap paratus. 35 The water deposited in the eliminator 3| drips down upon the inclined water de?ecting plate 33 where it ?ows downwardly upon the front surface of the plate 4| and runs off of the longer edge of this plate into the reservoir. This arrangement 40 provides a smooth evenly distributed sheet of water ?owing down the front face of the baf ?e plate 4| and thereby prevents the spray of paint and varnish lodging thereon where it would harden and be very difficult to remove. When the operation of the apparatus is dis continued and the exhaust fan“ 23 is stopped, the baffle plate 33 swings freely forward and affords free access for convenient inspection of 55 60 65 70 75 exhaust air circulating means, conduits means for conducting an therefrom and including means for de?ning an exhaust outlet for draw ing ‘air from the booth adjacent the bottom of the rear wall therein, inlet air circulating means,‘ an air inlet in the front portion of said roof, conduit means connecting therefrom for trans mitting a large portion of the inlet air through said air inlet, a transverse ba?le plate under said air inlet in said booth and inclined downwardly to 10 ward said exhaust outlet for de?ecting the air toward‘ and around the object being sprayed and toward ‘said exhaust outlet, a second air inlet mounted on a central portion of said roof, a high velocity air-projector for projecting a narrow 16 stream of air across said booth downwardly ad jacent the rear side of the sprayed object to ward said exhaust outlet. 2. A ventilated paint reclaiming spray booth having in combination a spray room inclosed by 20 a roof, side walls and end walls, exhaust con duit means providing an exhaust outlet in the’ lower portion of said booth, water spray means in said exhaust conduit means for washing the air as it is drawn upwardly through said con 25 duit means, a water reservoir disposed under said exhaust outlet, a ba?le plate disposed ad jacent said exhaust conduit means, a water eliminator mounted above the upper end of said exhaust conduit means, an inclined water de 30 ?ecting plate'under said water eliminator for guiding a ?ow of water to the inwardly directed surface of said baffle plate, exhaust air circulating means, and conduit means connecting said air circulating means to draw air upwardly from 35 said booth through said water spray and water eliminator. 3. A ventilated paint reclaiming spray booth having in combination a spray room inclosed by a roof, side walls and end walls, open portions in said walls, exhaust conduit means for exhaust ing air from said booth comprising water wash ing means, a water eliminator disposed there above, a water de?ecting plate disposed under said water eliminator for guiding the deposited water over exposed surfaces adjacent said air washing'means to carry the paint spray down wardly and prevent a permanent deposit #hereof and a water reservoir disposed under aid ‘air washing means to catch the water 'eturning It will be seen that I have provided an efficient. therefrom and to receive and preserve the re ventilated paint reclaiming spray booth in which claimed spray material in suitable condition for the paint or varnish is ef?ciently reclaimed and salvaging. 4. A ventilated paint reclaiming spray booth the booth is e?ectively ventilated by air par tially drawn from the room where. it is installed having in combination a spray room inclosed by 55 for providing a smooth ?ow of ventilating air a roof, side walls and end walls, open portions in the booth which is free from eddys tending in said walls, conduit means for exhausting air to drive the fumes back toward the attendant. from said booth comprising water washing means Aside from the speci?c embodiment of the in- ‘ and a water eliminator disposed thereabove, a water de?ecting plate disposed under said water 60 vention herein shown and described, it will be for guiding a ?ow of water to pass understood that details of the construction may eliminator adjacent said air washing means to carry the be altered or omitted without departing from the paint spray downwardly and prevent a perma spirit and scope of the invention as disclosed and nent deposit thereof, a water reservoir disposed claimed and that I do not desire to limit my in-, under said air washing means to catch the water vention to the exact constructions herein set returning therefrom and from said water elim forth. inator, an in-take air circulating device and con In the claims, the words “paint laden" are to duit means for conducting air therefrom to be understood as qualifying the air that has not spaced points in said booth and air de?ecting had the larger particles of paint removed there means for projecting the air from said inlet con from. W duits downwardly in said booth toward said water I claim: reservoir. 1. In a ventilated spraying booth the com 5. A ventilated paint reclaiming spray booth bination of a spray room having ‘a roof, a front having in combination a spray room inclosed by wall, a rear wall and partially closed end walls for passing articles continuously therethrough, a roof, side walls and end walls, open portions 75 the condition of the lower portions of the elim 50 3 inator plates. ' 4 in said walls, conduit means for exhausting air exhaust air circulating means, conduit means connecting said exhaust air circulating means and a water eliminator disposed thereabove, a for drawing air from said booth and de?ning an water de?ecting plate disposed under said water ' exhaust outlet near the bottom therein, said eliminator for guiding la ?ow of water to pass exhaust conduit means including air washing adjacent said air washing means ‘to carry the means disposed therein, a water eliminator dis paint spray downwardly and prevent a perma posed thereabove, a hinged water de?ecting plate nent deposit thereof, -a water reservoir disposed connected between the upper end of said air undersaidairwashingmeanstocatchthe 10 water returning therefrom and from said water washing means and said water eliminator where fromsaidbooth comprisingwaterwashingmeans eliminator, an in-take air circulating device, air inlet conduit means for conducting a large por tion of the in-take air into said booth adjacent the front wall thereof, a baille plate for direct 15 ing the volume of said air toward said water reservoir, a small conduit branching from said inlet conduit and connecting to a middle portion of said booth and high velocity air projecting means associated therewith for projecting a nar 20 row sheet of air downwardly across said booth toward said water reservoir. 6. A ventilated paint reclaiming spray booth having in combination a spray room inclosed by a roof, side walls and end walls, exhaust 25 conduit means providing an exhaust outlet in the lower portion of said booth, water spray means in said exhaust conduit means for wash ing the air as it is drawn upwardly there through, a water reservoir disposed under said 30 exhaust outlet, a water eliminator mounted above the upper end of said conduit means, an in clined water de?ecting plate under said elimi nator, for guiding a ?ow of water upon in wardly directed surfaces, exhaust air circulat 35 ing means, conduit means connecting said air circulating means to draw air from said booth upwardly through said water spray and water eliminator, open portions in the side walls of said booth, ‘an in-take air circulating device, conduit means for conducting air from said vice into said air spray booth, and a factory pass nozzle for by-passing a portion of in-take air to the factory room in which de by by the water returned by the eliminator is con 10 ducted down adjacent surfaces when the suction produced by said exhaust air circulating means is su?lcient to draw the hinged water de?ecting plate upwardly, and the eliminator plates are automatically opened for inspection when the 15 exhaust suction is reduced. 8. A ventilated paint reclaiming spray booth having in combination a spray room inclosed by a roof, side walls and end walls, exhaust air cir culating means, a water eliminator in said booth adjacent the rear wall thereof, air washing means disposed under said water eliminator, a water reservoir disposed under said air washing means and a hinged plate disposed between said water eliminator and said water washing conduit means to provide an air conductive connection therebetween when an exhaust suction is applied su?lcient to draw‘ the plate upwardly and where by the plate opens automatically and provides for convenient inspection of said eliminator when the exhaust suction is reduced. " 9. A paint reclaiming spray booth having in combination an exhaust conduit opening to the lower portion of the booth, a water spray in said conduit for washing the air as it is drawn up wardly through said conduit, asurface exposed to the paint spray, located above said conduit opening and between said conduit and the source ‘ of said paint spray, a ?lm of water covering and ?owing downwardly on said surface and a water reservoir disposed under said opening and ex the the _ tending beneath said surface to catch the water as it ?ows from said surface as well as the, booth is installed. water returning from the water spray means 7. A ventilated paint reclaiming spray booth and 15 to receive and preserve the reclaimed spray having in combination a spray room inclosed by material in suitable condition for salvaging. a roof, side walls and end walls, open portions in said walls for receiving articles to be sprayed, JOHN E. LUDWIG.