US1818736A - Dust arrester - Google Patents

Description

Aug. 11, 1931. R. H. MOORE 8,736

DUST ARRESTER Filed Feb. 26, 1927 5 Sheets-Sheet l ooooanooo on.

ava/275 '1 Aug. 11, 1931. R. H.'MOORE nus'r Annfiswnn Filed Fb. 26. 1927 5 Sheets-Sheet 3 A g 1931- R.. H. MOORE 1,818,736

- nusr ARRESTER Filed Feb. 26, 1927 Sweets-Sheet 4 tion of the screening units Fi'g'. Gis

Patented Aug. 11, 1931 I f UNITED; PATENT; 0 Price RAYMOND H. MOORE, or HARVEY, ILLINOIS, nss eiv'on m'o warm Ins CORPORATION, orifinnvmutnmois; aconro-ai 'rroiv or rumors" DUST ARRESTER applicatibn flleaIebruary 26, 1 927. Seria l"-No. 1'7 1,127.

The present invention relates to dust arrest'ers One object of .the'inventionzis to provide an arrester which is; composed of assembled '5 individual .units with frames and fabric in which the margins oi the tabricare padded to reduce the wear thereon; which iscomposed of individually supported: framed screening units in which such :units: are ,in-i 1 0 dividually' removable and. replaceable and of improved sectional construction ;-f which is composed of: like screening unitslwh-ich pro ride for a substantially/full discharge area from the screen; andin which the screen F5 jug-units 'areivi'bratedby pulsations, as, distinguished from: violent shocks to avoid wear of the fabric in the units. Another objectxot the inventionis to' provide a dust ai'rester which is generally of 119? new and improved construction, may be inanuf-a'ctured ata low .cost and isexceedingly eflicient ink opemtion: I

e Other objects of the" invention and ,the various advantages a ndi. characteristics of the present dust arrester constructionwillbe apparent from a con'sid'erationof the: detailed description.

The invention consists in the several novel features hereinaiter setforth and more par-- ticularly defined by claims at the conclusion hereof. o

In the drawings which accompany and form a part of this specification ordisclosure and in which like numerals and characters of reference denote corresponding parts throughout the several views; Fig. 1 is a transverse, section of an arreste'r embodying the invention. Fig. 2 isv a hori zontal section. Fig. 3- is a section' 't'aken on the line 3 -3 of Fig. 2 4f isa hotiaontal section through several of thesc'reening units" and one of the sidewalls; Fig. '5 is 39sec tional perspectiveillustrating the construe v a Per spectiveof one of the screening units. Figs.

7, T 8 and 8 are. perspectives, illustrating detailsof a screen frame. Fig. 9 is a vertical section through the vibrating device. Fig; 0' 1O isa; section on the line 10-40 of Fig. 9;.

Fig. 11 is a detail of the; outlet valve for the accumulated dust. I p 1 v v The dust arrester which forms the subject matter of this invention comprises, a casing A which is preferably of metalplate construction and is mounted upon a supportingv frame B of any desired construction. The: casing comprises a back; Wall 0 to which is connected an'a-ir intake a a bottom comprising discharge hoppers a? and a and a. floor section a? in front of the hoppers and securedon channel-beamsa; a front'wall a, to which is connected an air I discharge. pipe a for conducting the purified air-trom' I a transverse chamber a at the frontof the casing; a top wall a and side wallsa and 0}". The casing is built up .niainly' ofmetal plates which have their contiguous margins provided with right angled flanges a and 00 to form a lapped seam between. which, suitable packing,- such as tar paper, is interposed, the flanges being bolted to ether. O ne ofthe contiguous flanges is ,p-re era-bly reverted, as at a; to close-the edge of the seam. A baffle a which is spaced by brack 75 ets' 1 0 from the intake a is provided to de- Y fleet theair laterally and cause it to bedi's-. tributed transverselyof the receiving chamber a at-the back of the casing.- Suitable means, such as'an exhaustfan or blower (not shown): will belused to force the dust laden air through thecasingt Therasing containsa series of screening units which are alikeiii construction so, that thejcapacity. ofthe arrestermay be varied by varying the number of the screening units, Thessec tional plate construction herei-nbefore dc scribedfpermits of the expansion-of the casing for this-purpose. To the top a of the. casing is'secured a channel bar1'5; to'iwhich the upper ends of the screeningl'unit's are secured, as hereinafter set forth. A chain nel 16' extends transversely across-the frame adjacent the bottom thereotto support and retain the lower front endsof the screen units. This channel: is formed bar comp rising a web; 17 (Fig. 5) W,ith an upwardly extendin flange 1 8 and a downwardly extendingv ront flange 19 and a removable strip 20'whicli permits the screen; 1-00 '015- a metal v units to be placed in and removed from channel 16 upon removal of the bolts 21 which secure the strip against flange 19. The plates, forming the top and bottom and the front and back of the casing, overlap one another, and strips of tar paper 22 are placed between the laps to seal the joints against leakage of air. Similar strips 22 are also placed in the top seams between the rims of hoppers a and a and the side walls and flange 19, andbetween the top of channel 15 and top a to prevent air from passing into chamber a without passing through the screens. A door 23 is usually provided in the front wall a to provide access to the front ends of the screening units I and to chamber an? in the casing.

cloth. Preferably, the cloth extends contin The screeningunits, generally designated C, are adapted to fit together side-by-side, and are alike in construction, so that arresters of different sizes and capacities 'may be built up by varying the number of units and the widthof the casing. Each unit 0 comprises a frame and suitable fabric D, such as cloth. The fabric is applied so as to form rectangular side pieces which extend over the sides of the frame and through which air must pass in transit from the inlet chamber (0 to the exhaust chamber a This fabric is adapted to arrest the dust so it will fall into, hoppers a and a in which it will accumulate. Each screen-frame comprises a bottom rail 0 a back rail 0 a top-rail 0 a pair of front corner bars 0 and 0" which are spaced apart by the top and bottom rails, and a series of intermediate horizontal rails c which have their rear ends secured to the back rail and their front ends terminating between, and flush with, the front corner rails. Diagonal stay-wires a are stretched across and secured to the sides of the frame to hold the fabric D at the frame-sides. These wires are secured to the bars 0 by staples 0 and are lapped around nails 0 on the top and bottom rails of the frame. In practice, it-has been found that when the cloth used in these screening units isdirectly secured to the frame, it soon becomes worn as the result of the vibration to which the frames are subjected to cause the fabric to release the dust. To overcome this disadvantage, the cloth D is spaced from the side faces of the frame-members by pad ding. The latter is in the nature of strips ofcord (Z which are secured to the frame by nails d before the cloth is secured in place. These cords d extend lengthwise of the top and bottom rails c and c of the frame and upwardly at the rear corners of the rear upright of the frame, so that the cloth will be correspondingly spaced from the frame-sides, and the cord will form a padding or cushion between the frame and the uously across the back of the rear rail 0 as at (Z (Fig. 5). The cord cl also spaces the fabric from the heads of the nails 0 used for securing the stay wires 0 to the top and bottom rails of the frame.

To secure the top and bottom margins of the cloth of the rails c and 0 respectively, grooves 0 are formed in'the side faces of said rails immediately below the cord d on the bottom rail 0 and above the cord 03 on the top rail 0 and around the back of said rails, and bottom margins of the cloth D are folded into said grooves and secured therein by a cord d which fits snugly in the groove and is secured therein by nails (1 so that these margins of the cloth will be securely connected to the frame and so that when it is desired to replace the cloth, it may be readily removed upon removal of the cords (Z When secured in the grooves, these cords serve as a marginal reinforcement at the points where the cloth is secured to; the frame. The front margins of the cloth D are secured against the back faces of the front bars 0 and 0 by vertical strips (Z which are conterminous with the upper and lower ends of said bars. The front margins of the cloth are extended to lap portions of the side faces of the bars 0 and c and are there secured by nails (Z to said bars.

The upper ends of the bars 0 c and strips d are extended a short distance above the top rail 0 The space between the projecting portions of the bars and strips are filled by a block 0. A bolt 0 (Fig. 6) extends vertically through top rail 0 block 0 and through the lower flange of the channelled beam 15 of the casing to independently support the upper portion of each screen frame in place. The lower ends of the bars 0 and 0 and strips d" of each screen frame are also extended to project below the lower rails 0 and blocks 0 are suitably secured between the projecting ends thereof. The downwardly projecting portions of these bars and strips fit into the channel 16 of the casing. A strip of felt 25 extends over the top ofthe projecting portion at the top and front of the screen frame and across the front and back thereof, to form an air-tight joint between the frame and the channel-bar 15. A strip of felt 26 extends across the lower end and front and back faces of the lower projecting portion of each frame, to seal the joint between the frame and the channel 16,

in which it is seated. The outer side face of.

the frames with their margins folded into the grooves of contiguous front bars of the screen flamesand'are 'sccured therein by strips of cord 03 which are pressed into the grooves over the cloth and secured therein by nails (Z secured to the back rails 0 on the outside of the cloth to keep the rear portions of the frames properly spaced and so the parallelism of the frames willbe maintained.

The air is forced from the inlet chamber a at the back of the easing into the spaces betweenthe screen frames and; thence through the screencloths andinto the frames,"

and thence forwardly 'throughthe spaces between the front hereof the frame, thedust inthe air, beinga-rrested by the cloth.

The screen unit thus described exemplifies one which constitutes a complete unit which may lie-individually supported and removed;

inwhich the fabric is padded or cushioned and held 'in spaced relation'from the frame to reduce the wear on the fabric; in which;

In dust arrestersof this type, it has been the usual practice toprovide mecha nism for: tapping the structure tosubject the cloth to:

vibration which will cause it" to release the dust so it will be deposited in thedischarge' hoppers; In practice, it'h'asbeen found that mechanism which imparts a successionof: sharp shocks to the frame results in causing; 1 rapid wearingou't of'the cloth; Toovercome this objection, the present invention provides a mechanism for producing rapid pulsations of the screening units, as contrad-istinguished from sharp vibrations, or shocks. This mechanism comprises an electric motor E,

which is suspended from a board" secured to bracl'rets'e which are secured tothe front 0a of the casing. A metal channel bar 6 ex-' tendsacross the front of all or a series of screen units and is secured to each by a pairof bolts e which are fixed in blocks a which are secured to theframebetween the front barsthereof, so that thebar 6 will be rigidly secured tothe entireseries of screen-frames; A' vertically extending bra'cket'or base 6 is; secured to the longitudinal center ofthe bar 6 and is provided with a forwardly'projecting stud eon which is held an inner race 6 for a series of anti friction balls a An ec-- centric orunbalanced'wei' ht or member e extends around stud e and carriesthe outer race e for said balls which form: an antifriction bearing between the unbalanced member and the bracket, A hollow coupling;

member 6 is screw threaded into-the front Spacing blocks 0 (Fig. 2) are 7 face of the pulsating member c to' the rear end of a shaft e Said shaft is d'rivenfromthe shaft 6 of the'motor E by;

a flexible coupling comprising a member a secured toshaftc a member 6 secured to the front end of shaft 6 and an elastic driving sleeve 6? which is secured to reduced po'rtions of the members-respectively so as to constitute afle2 1ible driving connection for L the pulsating devicewhich will nottransmit the pulsations; ofthe electric motor. The rapid rotation of the member 6 which will impart vibrationsor pulsations which will be transmitted through bracket (2 to the pulsating bar The ball-bearing for the pulsating member is disposed -inside-thereof, so that all the load will be carried by thebracket 0 without transmitting the pulsations to the. motor. The member 0 isprovided witha chamber- 6"" which is adaptedto contain lubricant for the ball-bearing. A packing ring 0 is held in the inner end of the member e 'to prevent the lubricant from escaping. The ball race e is secured on stud e 'by a bolt 6 provided at its inner end with a nut and washer for clamping the race on the stud. Coupling member e may be unscrewed from the pul'satingmember and has a plug e so the chamber 6 maybe refilledwhen-desired.

' The invention thus exemplifies a device which is adapted to impart pulsations to the screen'units to cause them to deposit the dust collect-ed by the cloths without subjecting them to sharp shocks or vibrations, and this has been found to prevent the loosening of the fastenings of the fabric and the resultant wear of the fabrication; alsoa'construction in which the pulsating device operateswithout imparting vibrations to-the electric motor which drives it.

In theoperation of dust arrestersof this type, it is desirable to provide-meansfor ef-l fectively and-positively closing a valve for discharging dust. For this purpose, a valve casing 13- is secured-to the apex of each of the discharge hoppers a and a which isrprovided with a guidef in! which a stem f is -free to-slide vertically; A manually operable lever i pivoted-to the casing, as at f*, is adapted to engage the lower end of the stem; f todiftihtogether with a valve 7, which issecured-tothe upperend of'the-stemr The -casing is provided with an annular flange ff" which extends upwardly into the, hopper and a valve seat consisting of a: c. lindrical elastic ring fTfitted around said ange and extending upwardlyitherefrom. 'Valve 7 is colloidal, and its rim isfl'aredioutwardly and downwardly'toengagethe upper edge of'the, elastic seat ringf'U- When the valve is'closed, itwillr be seated on the elastic ring and will form an: efficient closure to prevent air or dust from escaping through the valve. The casing F. is provided with an outlet, spout f which leads downwardly from; the flange f.

This construction exemplifies a valve for controlling the discharge of dust from the dust arrester which forms an eflicient closure. The conoidal valve, seating on the edge of the cylindricalring, will not result in any leakage when there is collection of dust on said ring.

The invention is not to be understood as restricted to the details set forth, since these may be modified within the scope of the appended claims, without departing from the spirit and scope of the invention.

Having thus described the invention, what I claim as new and desire to secure by Letters Patent, is A 1. In a dust arrester, the combination of a casing provided with an air-inletand an airoutlet, a series of screen units each coinprising a frame and fabric sides, a flanged bar at the top of the casing, blocks fixed in the upper front corners of the frames, bolts passing through the blocks and flange to secure removably the frames to said bar, and means for removably securing the lower front corners of the frame in the casing.

2. In a dust arrester, the combination of a casing provided with an air-inlet and an air-outlet, a series of screen units each comprising a frame and fabric sides, a flanged bar at the top of the casing, blocks fixed in the upper front corners of the frames, bolts passing through the blocks and flange to secure removably the frames to said bar, and

means forming. a channel in which the lower front corners are held, said means comprising a removable bar for clamping the lower front corners in the channel- 8. A filter device for a dust arrester, con

sisting of, a series of independently and individually formed and secured screening un-' its each comprising a frame and a screen fabric extending over the sides of the frame, the front faces of the frames being provided with grooves and sealing strips lapping the joints between the'frames and secured in said grooves. 1

4. A filter device for a dust arrester, con sisting of a series of independently and individually formed screening-units each comprising a frame having spaced vertical front bars, and a screen fabric extending over the sides of the frame, the front-bars being provided with vertical grooves in the front faces thereof and sealing strips lappingthe joints between the frames and secured in said grooves.

5. In a dust arrester, the combination of a casing provided with an air-inlet and an airoutlet, and a series of screening-units dis-.

posed in the casing said casing being built up of plates so its width may be varied, the plates having angular flanges secured together to form joints, one flange of each oint being reverted to extend around the edge of the other flange. l V v 6. A filter device for a dust arrester, consisting of a series of screening units each comprisingaframe,fabricside-piecescoveringthe sides of the frame, and padding extending between and spacing apart the margins of the fabric side-pieces and the side faces of the frame. 1

7 A filter device for a dust arrester, consisting of a series of screen units each comprising a frame, fabric side-pieces covering the sides of the frame, and strips of cord between and spacing apart the margins of the fabric side-pieces and the side faces of the frame.

8. A filter device for a dust arrester, consisting of aseries of screening units each comprising a frame, fabric sides, a cord between and spacing apart the margins of the fabric sides and the side faces of the frame, the frame having grooves arranged outwardly of the cord into which the edges of the fabric sides are extended, and strips secured in said grooves to secure the fabric in place.

9. A device for vibrating the filter frames of a dust arr-ester to release the dust, said device comprising an unbalanced member rotatably supported by the frames and adapted to vibrate the latter, and means for rotating said member.

10. A device for vibrating the filter frames of a dust arrester to release the dust, said device comprising. a bar fixed tov the frames and provided with a laterally extending stud, an unbalanced rotary member rotatably mounted on the stud, and means for rotating said member. I

11. A device for vibrating the filter units of a dust arrester to release the dust, said device comprising an electric motor, avibrat-, ing member for the units rotatably supported by the units, and a flexible driving connection for the member driven by the motor, to prevent the vibrationsfrom beingtransmitted to the motor.

12. A device for vibrating the filter units of a dust arrester to release the dust, said device comprising an electric motor, an unbalanced vibrating member rotatably supported by the units, and a flexible driving connection for the member, driven by the motor, prevent the vibration from being transmitted to the motor.

13. A device for vibrating the filter units of a dust arresterto releasethe dust, said device comprising an electric motor, an unbalanced vibrating member rotatably supvibrate the frames comprising an unbalanced member having a portion thereof extending around said element, a ball bearing between said portion and the element, and means for rotating the member.

Signed at Harvey, Illinois, this 31st day of December, 1926.

RAYMOND H. MOORE.

Images