US2586616A

US2586616A - Continuous imbricated panel type filter

Info

Publication number: US2586616A
Application number: US77707A
Authority: US
Inventors: Dahlman Verner
Original assignee: American Air Filter Co Inc
Current assignee: American Air Filter Co Inc
Priority date: 1949-02-23
Filing date: 1949-02-23
Publication date: 1952-02-19
Anticipated expiration: 1969-02-19

Description

l Feb. 19, 1952 v. DAHLMAN CONTINUOUS INBRICATED PANEL TYPE FILTER Filed Feb. 23, 1949 Zmvenfor VfR/VER DA HL MAN Gttorneg Patented Feb. 19,` 1952 CONTINUOUS 'IMBRICATED PANEL 'TYPE' FILTER.

Verner'DahlmanQNew Lennox, Ill., assignor to American Air Filter Company, Inc., Louisville, 'Ky.,;a corporation of Delaware `@AIpplicaton Febr-.nary 23,.1949,?SerialNo. 77,707

(olgz'isssz) 'Claims.

The-:present invention relates; to an air' lfilter 'of theoverlapping.panel..type, in which a series,y of overlapped.. `lterlpanels. coated with liquidv are carried along.. onfan endless conveyor toform' a vertical .lterbed or l .curtain extending across the`pa`th of AairV flow. 'One such type ofair lter -ls.dsclosed in Patent 2,167,283, issued `July 25, 1939, to Arthur Nutting.

As ordinarily operated, the. panels on one flight rof thelter are properly presented in irnbricatedv relation. to Vthe air stream, but on the .other flight vthey are turned and are so. imbricated that the ypressurerof v.the air .stream can separate the -panels and pass therebetween.. unless additional Furmeans is provided. toA restrain the4 panels. thermore, the turning ofthe panels causes them to presentdownstream the. face which was for- :merly presented-upstream, with consequent vdisadvantage thatdustaccumulated on that filter face may beblownof intothe air stream.`

.It is an object of the presentinvention to proavide: an overlapping endless, panel type, lter in .which the panels are rearranged atthe.. return flight. in inversed overlapping relation to successively. restrain thewYpanels-against separation by theforce ofthe air stream. passing. therethrough.

-A further object Vis the. provision. of an overlapping panel double curtaintype filter in which -the Ipanels present .the same. face .upstream in .reach ight. or curtain.

A further object is the provisionof an endless ...type-panel -lter having atransfer and rearranging mechanismior transposing thepanels successively fromone ight to `the nextflight in .nversedimbricated relation.

, InV accordance withthe present Ainvention, there isprovided conveyor' means forremovably carrying imbricated panels of. a lter medium across .the air stream to befiltered, and a transfer means .../sarranged aty the end of the course to remove `and separate the panels-and successively replace .thepanels in inverse overlapped relation. forthe -returntravel across the air stream. This provides a double curtain of imbricated panels yin Whichthe panels, present the same face upstream is accomplished'by the provision of 1 a ytransfer.

ingsin which is..illustra.tedv ai preferred embodiment. of the invention-byway of example/and wherein:

'mechanismV meeting or intersecting' an `endless conveyor and which serves to. bodily remove each .lter panel from the conveyor when thai-,'"lter panel reaches the end4 of acourse,'bodly`trans fer the panel to thebeginning of thereturn course, and there. reassemble the"lter`panel"in inversed overlapping relationtfto the preceding, panel.. on the conveyory for' .thev return course.'

The-invention Willi bef described in greaterdetail in connection Withithe accompanying ldraw- Figure 1 lis a front ell'avation-oi` thelinvention, .Figure 2. is a. vertical sectional" View taken on line 2`-2. of .Figure 1,v

Figure" 3l i`s.-.` an enlarged View ofa detalfand Figure 4l is asection taken on line '4 5-4 f Figure -3. Y Referring to the drawing,jthere i'sshow'n a cabinet. or casing -l having' ai front: inlet opening 2A a. rear outlet. openingV k3.; and' a' trough` 4 at the bottom for Washing 'ud.AV At the'bottom ,agshaft V'.SY ist. suitably journalled at each'l side'l',l 6 vo f the housinggand carries at each end chain sprockets 11. and. transfer sprockets fwhicli sprockets `rotate together. At the. top of thecasingare supported stub shafts-'9 at eachjsidav and 'each shaft carries a` chain sprocl'retVv I'l ,and'a transfer'V sprocket I"2.

.An endlesslconveyor chain |3 extends around each pair of .chainfspro'ckets' comprisingA a sprocket 'l and IL., andf may be driven fromxshaft 5 at the bottom. .Asiv the construction 'and-operation of the two sides are' alike, .only one side will be described in detail. V v YEach chain, [3. travelsbetween' two guideflanges 4l5 and |16. vvhich may be madeof angle irons' suitably secured` tothe sideV 5 of the. housingv and the yside 6 carries 'similar "guide *flanges (not shown) Chain I3.v has notches lgfi'n its, outer periphery in linksfl'ocated atzsuitablyspaced ntervals, `the notches being formed, in` the mod lfication illustrated, in thev thin 'or innerflinksjof the chain. vrTransverse supportrod's Zfoarrying sleeves. or bearings V21 at' their en ds are; received in corresponding notches- |79 `of,-Ieach. chain; and

carry panels, 422,. ory sheets, of` asuitable 'ltjer ima- Vjsheet-offmetal mesh.. fabrics folded double' vr a 50.`

panel to cross over without interference.

f described.

clip 23. However, any other suitable filter Amaterial may be employed, which may be mounted on any suitable swivel or pivot carried in notches I9. As shown, the panels 22 are substantially double the distance between notches in the chainv so that on the straight nights the panels are imbricated to form a substantially continuous filter curtain on the exterior of the chain on the upstream side, with one face, hereinafter designated as the upstream face, presented to the air stream.

Thejinve'ntion, vwhich is directed to an arrangement for reversing the individual filter panels at one end of their travel so as to cause them to present the same face upstream on the return flight of their travel, now will be de-k scribed. The exterior track or guide channel l is expanded at the top end at 26to embrace the periphery of transfer sprocket l2, and the track may be similarly expanded at 21 at the bottom to embrace the bottom transfer sprocket 8. The inner track deflects inwardly at 28 to guide the cha-in inwardly to the chain sprocket H and when a notched link registers with a notch in the transfer sprocket l2 the rod 20 in the link is picked up by the pair of transfer sprockets l2 and carried around thereby to the point where the chain again registers with the transfer sprocket, at which point the rod reenters a chain notch. 'I'he absence of a cross shaft between sprockets l2 at the top allows the filter A leaf spring 29 is provided at the top to engage the panels as they come around on the discharge side of the transfer sprocket to compel their overlap on the interior, so that when the rods 20 are picked up by the chain at the beginning of the downward flight the panels are arranged .with each panel overlapping the adjacent lower panel on the inside of the chain, and all panels present their upstream faces upstream, as they move downwardly toward the oil bath. Thus, each panel is braced by the rod of the next lower panel so the panels cannot separate to allow air to blow through. The downstream opening 3 is sealed with respect to the filter curtain by sealing strips in known manner to prevent air bypassing the curtain.

At the bottom, the swivel rods 20 are picked up from the chain by the transfer sprockets 8 and are carried around the expanded guide track 21 through the washing bath where they are washed and, upon rising on the discharge side, are again taken up by the chain in overlapping position on the exterior of the chain with the same face upstream. This avoids dipping the chain into the washing iiuid and gives each panel an opportunity to drain before it is picked up by the chain.

The operation of the invention now will be The chains i3 are driven from shaft 5 and may be advanced intermittently as required or at a slow continuous rate. As each rod 20 carrying a filter panel 22 reaches the bottom transfer sprockets 8, it is removed from the chain'and is lowered in the track formed by sprocket 8 and ange 21 into the washing bath in trough 4. Accumulated dust is washed off the panel and the panel receives a fresh coat of liquid. The panel is given an opportunity to 'drain and is then picked up by the chain and carried into the opening 2 in overlapped relation to the next following panel. At the top, as each rod reaches the transfer sprockets, it is picked up out of the chain notch and is carried around 26 while it dangles from the sprockets. At the opposite side the leaf spring 29 deflects the panel inwardly to cause it to overlap the preceding panel on the inside, and on the downward course the same face of each panel is presented upstream as on the upward course. This eliminates the danger of the stream of air disloding dust from the downstream panel.

If desired, the filter curtan may be driven at the top from a shaft carrying gears or sprockets meshing with the transfer sprockets I2 and of such' diameter that the filter `panels will clear the shaft in their transfer. Various other modifications may be made in the invention without departing from the spirit or scope thereof.

I claim as my invention: 1

1. In an air stream iilter of the imbricated panel type: pairs of spaced conveyor sprockets; a pair of endless chains having slotted links passing around said conveyor sprockets providing advacing and return courses across an air stream; rods carried in said slotted links, each. rod carrying a filter panel, the length of the filter panels and the spacing of the rods providing an imbricated panel curtain; and pairs of rotatable transfer sprockets of larger diameter than the chain sprockets located at the ends of the courses to engage and remove said rods successively from one course and transfer the rods to the other course in inversed imbricated panel relation.

2. In a filter of the overlapped panel type: an endless conveyor providing advancingv and return air-cleaning passes across an airl llow passage and a crossover course from the end of each pass to the beginning of the other pass; a succession of lapping panels along each pass, each panel extending transversely across the conveyor, each being removably mounted on the conveyor along each pass and each presenting the same face upstream on each pass but being arranged on one pass to overlap the front side and one transverse edge of the following panel and being inversely arranged on the other pass to underlap the back side and the opposite transverse edge of the following panel so as to form an imbricated curtain on each pass with the adjacent panels of one curtain in one relationship and of the other curtain in relatively inversed relationship; and transfer means located adjacent one crossover course to remove successive panels from the conveyor at the end of one pass, move each panel outwardly from the conveyor and around the adjacent crossover course to clear the panel from and inverse its relation- Ship to the following panel and then feed the inversed panel back to the conveyor at the beginning of the other pass, said. transfer means including a panel-engaging member mounted for movement in timed relationship to the conveyor over a predetermined path which loops outwardly around the adjacent crossover course from one side of the conveyor to the other.

3. In the lilter of claim 2 wherein: at least a portion of that section of the conveyor, providing said one crossover course, extends about an axis in a circular path; and said member moves about the same axis over a larger circular path.

4. In the iilter of claim 2 wherein: at least a portion of that section of the conveyor, providing said one crossover course, passes around conveyor sprockets; and said member is in the form of a larger sprocket mounted for rotationwith the conveyor sprocket about the .same axis.

veyor extends around conveyor sprockets at each ,3

crossover course; and said member for each transfer means is in the form of a larger sprocket mounted for movement with the adjacent conveyor sprocket and about the same axis.

VERNER DAHLMAN.

6 REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,836,131 Richter Dec. 15, 1931 2,070,872 Strindberg Feb. 16, 1937 o FOREIGN PATENTS Number Country Date 365,723 Great Britain Jan. 28, 1932 576,709 Germany May 18. 1933