US1818391A - Self cleaning filter - Google Patents

Description

Aug. 11,'1931'. o.` v. GREENE r 1,318,391

sELE CLEANING FILTER A Filed May 4, 192s -2 sheets-snelst 1 EME NVENTOR.

scar V/-eefze BY I 1 @by 9M f @Eg ATTORNEY@ Aug. 1l 1931.

c. v. GREENEA v 1,818,391 SELF CLEANING JF'ILMR Filed Mayi4, 1929 2 Sheets-sheet 2 l INVENTQIL Oo cr VfG/'6622 UML* ET Patentcdh'Aug. 11, 1931 08m v. GREENE, OF CLEVELAND, OHIO SELF GLEANING FILTER applicati meaicay 4; 192e. serial mi. seoaia.

The present invehtion relates to ainor dust' filters particularl adapted for use in connection with the lrtering of air for buildings and the like, and more particularl provides "5 a filter mechanism which may ,readil cleaned with'out removing it from the insta lation, the cleanin means being built in as aportion of the fi ter. To the accomplishment of the foregoin and related ends, said 10 invention then, consists of the means hereinafter fully described and particularly inted out in the claims; the annexed drawings and the following description setting forth in ldetail certain mechanism embodyu in g the invention, such disclosed means constituting, however, but one of various mechanical forms in which the principle of the i invention may be used.

Insaidannexed drawings: l zo Fig. 1 is a front elevational view vof the lter; Fig. ',2 is a side elevational view of the same; Fig. 3 is a cross-sectional view on the line 3-3 of Fi 1; Fi 4 is a sectional view through one o the tering sheets; Fig. 5 zi is a front elevational view of a unit heater showing a modified form; Fig. 6 is an end view o the .unit shown in Fig. 5 taken on the line 6-6 thereof ;`and Fig. 7 is a section of a detail.

In the present type of ilter there is provided a main frame 1 which has a closed-in portion 2 at the top, in which is mounted a roller 3 having its ends journaled in the side f frame members, and which is likewise provided at the bottom with a casing 4, in which a sec nd roller 5 is mounted, this roller being mou d in slots 6 so as to bevertically movable and beingeof suilicient weight'to maintainthe filter lts 7 and 8 under the desired tension. The' framework has a protecting sheet 9 of heavy in front of the two belts 7 ands of ltering material. Each belt consists of sheet 10 of relativel and a s eet 11 of -filter cloth, these sheets being bound together to form a flexible unit l Wthl-minimumstretch but with strength to resist wear and tear incident to operation.-

The two belts are in, contactA where passing overthe rollers but are spaced apart through stantiall to which may be attache mesh wire screen mounted' coarse mesh flexible wire screen the main portion of the filter casing by means of spacing rolls 15, the inner belt 8 passing over the inner sides of the rolls and being thus spaced from each other and from the A outer belts and being held under tension, the 55 rollers being carried by end bracketsi 51 which are pivotally mounted in the frame and which are held by a spring 52 connecting the bracket arm 53 and the frame. The space between belts is widest atthe vertical 30 ceiter of the filter and the belts ap roach each other as they near the top and ottom where they pass over the .main rolls. In operation the belts are held stationary until they have accumulated enough'dust and dirt g5 to make cleanin desirable.

YAs filters of t is t pe are commonly used onlyduring the daytime in building installations, they may be'easily cleaned at night when the ventilatin'g fans are shut down. 70 The cleaning' mechanism isbuilt into the lower portion of the casing as an integral unit, this cleanin mechanism consisting, as shown of a pair o vacuum 4cleaning nozzles 16 and 17 formed in the front of the casing 4 and sub- 75 covering the full wi th of the filter. ese two nozzles are connected together by a pipe 18 havinr a single outlet 19,

d the usual vacuum hose connection or vacuum cleaning consu nection of any type. When it is desired to Vclean the filter, the vacuum hose is attached tothe connection and then the belts fare ro-A tated so as to pass the outer surface ofthe belt over the vacuum cleaner nozzles 'thus e5 sucking the dirt back from the filter belts into the vacuum cleaner. The usual procedure is to move the belt around so that the sides of the two belts, which are normally at the rear ofthe filter, are reversed and are left `as the no i-st two or `front two belts of thefilter, although of course the belts can be completely cleaned, if this is desired.

To rotate the belts, the lower filter casing is provided with a platform 2O on which c5 is'4 mounted a motor 21 and a speed reducing mechanism 22, this mechanism driving a shaft 23 which extends along the rear ofthe lower filter casing 4, this shafthaving a spocket 24 on itsouter end, preferably `chain 100 connected to a sprocket 25 which is carried 'on an extension of the lower roller 5. At

the other end the motor carries a pulley 26 which is referably belt-connected to a beater roll 27 w 'ch is mounted in the front of Athe casing in substantial contact with the filter belts this roll being provided with lon'tul;

dinal projections, brushes or ribs 28 w beat against and jar the belts as they are rotated. The beater roll is driven at high speed, whereas the lower, belt roller 5 is driven at a very slow speed through the reduction gearing and the further speed reducover a curved plate 62 along the top of the' lower casing while the-inner belt passes over an idler roller 63, the belts being, in contact t with each other and being held to prevent vibration above this horizontal line. The beater roll jars the belts 7 and 8between the idler rolls and the pressure line where thevbelt passes between the casing and the main roll 5, there being a sealing strip 64 mounted on the casing at this 'line to limit the vibration of the belts to this area defined by the idler roll 63 and strip 64 which is substan-V tially the size of the vacuum cleaning nozzle 36 being placed between the blower mechais attached a crank 48 so that opening in the casing 4. Y The cleaning a'ction-is thus confined to the nozzle area and vibration of the beltsabove such area, and consequent dislodging of dust and dirt is prevented. Y

In Figs. l5 and 6 the same type 0f mechanism is applied to a unit heater, which consists of'a small casin 30 having a heating coil 31 near the top, outet openings 32,' a blower fan 33 and bottom inletopenings 34 which are controlled by a damper 35i, the filter inlet nism 33 andthe bottom openings`34, and here the filter unit, because of the limited static capacities of the fans employed, consists prevferably of a single belt 40 similar in construction to the belts reviously described, this 1n belt being mounte in ahframe carrying two. rollers 41 and 42, one of which, 42, is springpressed outwardly to obtain the desired Vbe t tension. At one end of the casing a vacuum cleaner nozzle 44 is mounted to extend across and co-o erate with the belt, this nozzle heilig provide with a suitable connection 45 whi communicates with the outside of the casing, to which may be easily 'attached the vacuum hose connect-ion. To rotate the belt when it is' desired to clean the same, the' roll 41 at the vacuum cleaner end of the casing has one `end 47 exposed through the casing, to which the roll may be lhaving sp slowly rotated by hand, thus passing the belt across the vacuum cleaning nozzle at any desired speed, and the belt will be rotated by hand until thoroughly cleaned. To accomplish this, the Ventilating mechanism, con-y sistng of the blower fan r the unit heater, is of course shut down while the vacuum cleaninf1r is being accomplished. In both forms above described, the filter elements and supporting frames are sealed to prevent any by-passing of dirtyair around the filter and direct the air flow throughthe several spaced elements in sequence.

The present type of filter is. particularly adapted forl use where vacuum cleaning means are available and where it is desirable to make a rmanent installation as the cleaning of t e filter is automaticall accomplished, thecleaning mechanism being built as 4an integral part of thev filter mechanism itself. By the use of flexible belts, the desirable beltps acing, that is, the spacingbetween individuav filter elements, is easily accomplished -and the cleaning is satisfactoi'g1 as the outer belt onthe front side of the ter is that portion 'which collects the greatest amountlof lint and dust, and this is the belt, or portion of thebelt, which is directly in contact with the cleaning nozzle, and thus the dirt anddust rviseasily'and quickly removed. Y

Other modes of applyingthe rinciple of my invention may be ein loye instead of the one explained, change being made as regards the -mechanism hereinA disclosed, r0- vided the means stated by any of the fo owing claims or the equivalentof such stated` means'be employed.-

I therefore 'particularly point out and distinctl claim as my invention l. a filter, the combination of a frame, having spaced rolls, an endless filter belt mounted in said frame over said rolls, a casing at one end of said frame, and having a vacuum .cleanin nozzle opening adjacent the belt, means or holding the belt against said casing at the'top and bottom of said nozzle opening, other means in said casing for jarring said screen` at said opening, an ineans for moving said belt past said openg. l 2. In avfilter, the combination of aI frame,

said beater roll tovibrate said belt at sai loo' aced rolls, an endless filter belt j mounted in said frame over said rolls, a casopening, and Ymeans for moving said belt past' p said opening.

. .3. In'lter construction, the combination of a frame, a rollermounted at each end of :,eiase;

said frame, two belts of filter material oxtending around said rollers, said belts bein continuous and in su rposed relation, an means intermediate o -said rollers and adapted to engage the inner one of said belts to space the inner belt away from the other belt, and to space the portions of the inner belt betweenthe rollers from each other.

4. In filter construction, the combination of a frame, a rollermounted at each end of said frame, two beltsoflilter material'extendng around said rollers, said belts being` contin nous and in supe osed relation, and a pair .of rollers mounte in said frame at approxi-` n 1 5 mately equal distances from said first rollers and adapted to have the inner of said two t belts pass-over and in contact with the inner 1 surfaces of the rollers to space the inner belt -jfrom theouter belt, and to anice the vlon'gi A 29 tugnal portions of the inner lt` from' ot er. 5y

5. In a filter, the combination of a frame, having spaced ro11s,two endless filter-belts mounted 1n superposed relation in said fratriev 1 over said rolls, a casing at one end: of'sfaid frame having a vacuum cleaning`v nozzle open-f! ing adjacent said belts, means for holding ,said be ts a inst said casing at the top andA bottom of sai nozzle openin ,other means casing for jarring sai screens at said opening, and means for moving said belts past said 0]?el1il1gn .l v I 'I' 6'. In a filter, the combination of a frame, 1 haw'ng spaced rolls, two endless filter belts f` mounted 1n superposed relation in said frame over said rolls, ai casing at one end. of said frame having a vacuum cleaning nozzle o ning ad'acent .said belts, meanspfor hol in ,said be ts against said casing at the top an 40 bottom of'said nozzle opening, a beater roll mounted in said casing across said opening, means for rotatin said beater roll to vibrate said belts at sai openin and means for moving said belts ast sai o ening.

' 45 Signed by me this 3d day o May 192s. OSCAR v. GRENE.

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