US2153270A - Dust collector - Google Patents

Description

A ril 4, 1939. A. B. oseoon DUST COLLECTOR I Filed April 21, 1938 2 Sheets-Sheet 1 @Wiiob 141 217111 15'. 0; 000

A. B. oseoon DUST COLLECTOR April 4', 1939.

2 Sheets-Sheet Filed April 21, 1938 59 15215 H-Ziamec 7 3. m

Patented A 2... ,4, 1939 UNITED STATES PATENT OFFlCE I "2,153,210 I nU's'r connso'ron Arthur B. Osgood, Minneapolis, Minn.

Application April 21,

1 Claim.

' ductory comment. Stated in a general way the invention has for its objectsimplicity and low cost of construction, ready adaptability to various positions and conditions and increased efflcienc in the dustcollecting action.

,The construction and arrangement whereby the objects above generally stated are accomplished will be made clear and will be more apparent after flrst'having described the invention in a commercial form illustrated in the accompanying drawings wherein like characters indicate like parts throughout theseveral views. Referring to the drawings:

Fig. 1 is a perspective view with parts broken away in sections showing the improved dust collector; y

. Fig. 2 is a horizontal section taken on the line 2-2 of Fig. 1' showing only the parts on the said section line; Fig. 3 is a horizontal section taken on the line 3-3 of Fig. 1 showing only the parts on or closely adjacent to the said section line; and Fig. 4 is a horizontal section taken on the line l-t of Fig. 1 showing only the partson'or closely adjacent to the said section line.

The entrance chamber of the dust collector is iormed within a cylindrical shell 5 which has a I as tangential air inlet spout 6 and an annular cover.

m the axis of which is concentric to the axis orjuie cylindrical shell 5. The large upper edge of the conical shell 9 is co-incident with the lower edge of the shell 5 and may be rigidly secured thereto in various ways, but preferably is detachably seis cured thereto. .This'detachable connection, as shown, is made by nut-equipped bolts l0 passed through annular angle flanges ii and i2 riveted or otherwise rigidly secured to the said shells 5 and t. The outer edge of the'annular cover plate so i, as shown, is clinched around an annular angle flange i3 bolted, riveted or otherwise rigidly secured to the upper edge of the cylindrical shell 5. Concentrically located within the cylindrical shell .5 is a stack M, the upper edge of which, as

55 shown, extends slightly above the flange 8 and is 1938, Serial No. 203.278

there provided with an outwardly projecting annular angle flange I 8'. The extreme upper edge of the stack I4 is co-incident with the cylindrical walls of an inverted cup-shaped dome or bonnet it that has a tangential outlet spout II. This dome or bonnet is rotatively adjustablein respect to the'stack so that the spout I! can be set at rotative adjustment may be accomplished in different ways as by a .swivel, but as shown, the

any angle in respect to the intake spout 6. This I adjustment is accomplished by providing the dome at its lower edge with an outstanding annular angle flange l8- that is adjustabiy but further feature the depending portion of thestack is in the form of a downwardly detachably tapering truncated cone Ma, the surface of which is concentric to the surrounding portion of the conical shell 9.

As a further and very highly important feature the main body portion of the stack is provided with tangential dust discharge passages which, as will presently be noted, produces a skimming action of the dust from the air. The preferred way of accomplishing this is to form the body of the stack M of a plurality of cylindrical segments overlapping to formshallow skimmer passages or outlets Mb and spaced by tie block Ho riveted to the overlapping sections. As shown, the body of the stack is made up of four segments, but the number may be increased or decreased. Preferably the conical skirt or lower end portion Ma of the stack is continuous or unbroken. In practice the skimmer passages are generally about one-sixteenth of an inch in width but that dimension may be varied according to the size of the apparatus.

The conical shell 9, at its lower end, terminates inc. contracted-discharge spout 20 which may dead air space at the bottom thereof, thereis interposed a baffle in the form of a cone 2| that is concentrically located within the shell 8. This conical baflie, at its upper end, is shown as secured to an axial upwardly projecting stem 22 which, as shown, is rigidly supported by cross passage is left in communication between the upper portion of the shell 9 and the substantially deadair space 24, that is in direct communication with thedischarge spout 20.

In practice it has been found that dust will tend to adhere to and accumulate on the interior of the lower portion of the conical shell 9. To prevent such accumulation, I provide a rotary cleaner, which in the preferred arrangement illustrated, involvesa rotary vane in the form of a flat bar 25, to the ends of which are attached loosely depending scraper chains or cables 26. The operation of this cleaning device will be described later on.

The operation of the device or apparatus in the air cleaning and dust collecting operation is substantially as follows:

The dust laden air under pressure will be blown through the intake pipe or tube 6 and delivered tangentially into the cylindrical shell 5. The air thus introduced under pressure will, under high velocity, be caused to travel against the interior of the cylindrical shell, partaking of a spiral movement with downward trend. After making several circuits around the interior of the shell 5, the dust laden air will be caused to continue a spiral downward travel against the interior of the conical shell 9; and as the dust laden air progressively moves downward within said conical shell its travel per feet per minute, while remaining approximately constant, will increase I in the number of complete convolutions that it be seen that air finds its only outlet as it is updownward into the conical shell. Moreover, most -makes per minute.

noted spiral rotary movements of the dust laden- Of course, under the above air, the dust or heavy particles will be caused to travel against the shells and will progressively move toward the bottom of the shell 8. c From theforegoing description of parts it wi wardly whirled through the stack and dome by the action of the tangential outlet spout 11 through which it is discharged. The downwardly projecting cone Ila of the stack positively prevents any of the air from, changing its downward course and movement into the stack until after it has passed below the cylindrical shell-and well of the dust laden air will be caused to travel against the interior of the shell 9 until it reaches the space around the bailie 2! which cuts off further downward travel of the air and causes the same, while continuing its rotation in the constant direction, to partake of an upward trend into the stack. The major part of the dust,

in fact all of the heavier particles, will be precipitated from the air downward into the dead air space 24 before the air takes its upward spiral course; but some of the lighter dust will be carried by the air upward into the stack. As this air,

- with the remaining light dust, is caused by centrifugal force to cling against the interior of the stack, it will be repeatedly delivered against the shallow skimming passages Ila which will cause the dust to be discharged back'into the main annular channel formed between the stack and the cylindrical shell. In this way all, or practically all, of the dust carried upward by the air will be delivered back into the main air stream for re-s'eparation. The skimming channels Ila are so shallow that the outer passage of air therethrough with the dust will be very slight. Substantially one hundred per cent clean air will reach the dome l6 from which it will be discharged tangentially through the spout I1.

It will be noted, by reference particularly to Fig. 4, that the overlapping of the segments of the stack and the arrangement of the skimming passages therein is such that the air delivered tangentially into the cylindrical shell 5, through intake pipe 6, will cause the air to whirl in a counter-clockwise direction and produce more or the latter free from accumulated dust.

In the structure described, the dome l6 constitutes an upward extension of the stack which, for reasons described, is preferably made rotatively adjustable. To secure the best results, the outlet tube i! should have at least as great or preferably a little greater cross section and air conducting capacity than inlet tube 6.

In the above described preferred arrangement, the dome, the cylindrical shell, the conical shell, the stack and the battle have a common axis. That is, they are in concentric arrangement in respect to a common axis.

a. While] the preferred form has been described, it will, of course, be understood that various alterations and changes in the features disclosed may be made within the scope of the invention herein described and broadly claimed.

What I claim is:

A dust collector comprising a casing having annularly spaced inner and outer cylindrical walls connected by a substantially horizontal cover'or top wall and providing therebetween an unrestricted annular passageway, said inner and outer walls being formed adjacent said top wall with tangentially disposed discharge and inlet openings respectively which openings communicylindrical wall whereby to provide an air outlet stack centrally through said casing, and said stack being provided with a dome the side wall of which is a substantial continuation thereof a above said top wall and having a tangential outlet leading therefrom over said top wall to cooperate with said tangential inlet in causing air under treatment to whirl violently through said annular air passage and also throughout said central outlet stack, whereby dust entrained with the air in said central stack will be thrown against the inner wall of said stack and expelled therethrough into the whirling incoming air stream in said annular passageway for further separation therefrom.

. ARTHUR B. OSGOOD.

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