US2390297A - Gas purification - Google Patents

Description

Dec. 4, 1945. H. GILMORE GAS PURIFICATION Filed Sept. 21, 1942 2 Sheets-Sheet l Dec. 4, 1945. H. L GILMORE GAS PURIFICATION 2 Shets-Sheet 2 Filed Sept. 21, 1942 Gimme Patented Dec. 4, 1945 GAS PURIFICATION Harry L. Gilmore, Adrian, Mich., assignor to Aget Manufacturing Company, Adrian, Mich., a corporation of Michigan Application September 21, 1942, Serial No. 459,140

2 Claims.

This invention relates to the handling of gas to and through a filter, especially at volume rate.

This invention has utility when incorporated in multi-stage removal of particles from a fluid by cyclone and filter, and the installation unit therefor.

Referring to the drawings:

Fig. 1 is an elevation of the air purifier unit embodiment of the invention, with the housing below the filter removed, and looking at the motor end of the motor-blower therefor;

Fig. 2 is a view at right angles to the showing in Fig. 1, portions being broken away;

Fig. 3 is a detail view of the upper head section for the filter;

Fig. 4 is a section on the line IV-IV, Fig. 1, through the filter, and showing the cyclone tangential draft receiver;

Fig. 5 is a partial section on the line V-V, Fig. 2, showing the uptake from the blower, and a fragment of the coarse particle receiver jar;

Fig. 6 is a section on the line VIVI, Fig. 1, showing the deflectors near the port terminus of the discharge leg for the cyclone dust collector;

Fig. 7 is a view from the line VIIVII, Fig. 5 showing the intake tube section or thimble to the fan or blower;

Fig. 8 is a section on the line VIII-VIII, Fig. '7, showing the integral structure of the port and throat;

Fig. 9 is a view similar to Fig. 8, wherein, instead of a port directly extending outwardly from the throat, there is provided a dome adaptable for multiple intake connection;

Fig. 10 is a section, with parts broken away, through the double wall for the filter with the filler fiber in place before the heads are applied thereto; and

Fig. 11 is a view similar to Fig. 10, with the heads assembled with the fiber excess efiecting sealing therewith.

The turnin on of electric switch I starts motor 2 having shaft 3 upon which is mounted multi-blade fan 4. There is thus provided a direct-connected motor-blower unit. Normally enclosing this motor-blower unit and rising upwardly therefrom is housing 5. Axially of the fan the housing 5 has opening 6 which has thereabout flat ring or flange I anchored with the housing 5 by self tapping screws 8 radially inward from bounding bead 9. Extending into the opening 6 is throat I0 (Fig. 8,). For single intake, there may be restriction II therefrom to intake duct or port l2 adapted to have connection [3 say Wheel 15. The particle laden air as .drawn through the intake [2 is so directed by the throat [2 that in normal fan operation there is no tendency to eddy about the ends of the blades of the fan 4.

In instances where it is desired to connect more than one region for having air exhausted therefrom, there is installed, in lieu of the single inlet unit (Fig. 8), a dome 16 with a desired number of ports H for connecting ducts I8. Bead 5 may be omitted from the flange 1 of the throat Ill, and flange l9 anchored thereupon by screws 8. Peripheral stiirening bead 20 also serves as a trim for this intake throat fitting (Fig. 9).

Registering with this opening 6 in the housing 5 is fan housing side 21 with its opening 22. The side 2| in this assembly is adapted for placement directly against the housing 5, and has marginal flange 22' extending away from the housing 5. About this flange 22' may be placed scroll body 23 with weld anchoring on the inside. Companion fan housing side 24 adjacent the motor has central opening 25 for the motor shaft 3. The margin of the side 24 carries a flange 26 similar to the flange 22' of the side 2|, but extending toward the motor 2, or away from the fan 4 (Figs. 2, 5). There is thus provided a scroll housing about the fan 4 with rectangular crosssection riser 21 near a corner leg 28 rising from base 29, and about which extends the housing 5. The riser 21 extends to elbow 30 with tangential discharge 3| to intake port 32 at cylindrical re ceiving portion 33 of a cyclone type dust collector (Fig. 4).

The cyclone dust collector from its cylindrical receiving chamber 33 has the clockwise swirl as coarser or heavier portions progress downwardly along the tapering section 34 toward discharge port 35 having screw section 36, say similar to a fruit-jar top, adapted for thread connection with throat 31 of glass type fruit jar 38 as a coarser particle receiver. The accumulation of particles may thus be readily observed and timely attention given for emptying or replacing this receiver. In order to dissipate the travel rate and thereby contribute to early quiet repose of these particles, the section 34 near the port 35 has one or more wings or vanes 39 (Fig. 6). The vanes 39 are arched or dished to form a side 40 with the vane extending toward the port in the clockwise direction of the swirl. The particles pass into the jar or receiver 38.

The incoming gas to the cyclone dust collector, although more or less purified gas. and at to hood M (Fig. 2) from an abrading r polishing reduced velocity, may eddy upward through concentric exhaust 4! (Fig. 4) into chamber 42 of the filter.

Foraminous sheet 53, say of expanded metal, may be welded at 44 into a cylinder, about which may be wrapped filter fiber 45, say of fiber glass, which may beas light as 3% lbs. per cubic foot. Inasmuch as the normal placing of the filter is with its axis vertical, the inner wall of the double wall structure has a lower but slight outward offset 45, while there is at the upper end a larger crowding section or flange 41. 45 of generally uniform and homogeneous character in its initial wrapping about the inner wall foraminous tube 43, has excess ,48 (Fig. 10) terminally thereof. Outer foraminous wall 49 may be of similar expanded metal to the inner wall 43. Tongues 50 overlap between the ends of the wall 49 to hold the wall 49 to embrace the filler 45 with terminal minor inturned edges 46, the lower being toward the edge 45 of the wall 43, while the .llpe r i ow d major a d a her stiff an e 4 assembly of heads with this double side wall fiberfilled foraminous tube produces the filter of Volume for rapidly passing air in considerable llaeii yz unifo m y treated for elimination of particles therefrom. Lower head 5| (Fig. 11) has bounding flange 52 with holding means or anchorage 53 for concentric inner flange 54. Upper head 55 has outer flan e 56 with seat 51 therefrom to opposing wedge or seat portion 53. The f anges 52, 58, are toward each other and of common diameter. Ifhe flang 54 is toward the wedge 58. Bolts 59 extending through the heads 55, 5| with wing nuts 50 thereon, permit crowding down of the excess 43 of the fiber 45 in providing automatic gasket assembly of the heads inthe filter. The more rigid wedge 58 so acts upon the crowding section or flange 41 that there is such holding of the loose fiber at the upper terminus of this vertical axis double-wall filter that in practice, notwithstanding slight vibrations, say as arising from the blower or other machine operations, long continued service has not developed sagging or any departure from uniformity" of fiber, effective filtering, or screenmaintenance as. inst l ed- While i d u ram j lls l ber l t r ay be dir 1y connected to take exhaust from a blower or other entrained gas or air supply, a quite advantageous" capacity increase is had in the stage removal through the interposition of the cyclone.

Exceptional practical values arise from such multi stage particle removal assembly unit, for the The loose fiber coarse fragments are conveniently taken as found accumulated, from the jar 38. The filter fiber 45, as of fiber glass, does not deteriorate physically and in normal operations approaches a permanent set up. When it is found there is detrimental lag in air or gas passage through the lilter, cleansing may then be had of the filler or fiber 43 in or out of the double wall structure. However, replacement with new fiber directly restores to initial efficiency. i

' In placing the flange 54 (Fig. 11), with its outwardly extending flange against the head 5|, it is held by anchorage 53 along the flang fiat portion.

Compactness in the cyclone and filter assembly is adopted in having the cylindrical chamber 33 of the cyclone extend up into the filter chamber 42. The distance of this extent is desirably such that the exhaust opening 4| is not restricted by proximity to the head 55. This means, that the cross-sectional extent or area of the exhaust 4| is not in excess of the cylindrical spill area over theupper terminus of the cyclone into the filter chamber 42. The exhaust from the cyclone dust collector thus has expansion and course or direction change as entering the chamber 42, thereby promoting further release of particles to fall on the lower head 5i. This action reduces the entraining quantity of particles inthe filter and further contributes to maintenance of uniform operation over an, extended time period.

What is claimed and This desired to secure by Letters Patent is: a

1. A cylindrical filter comprising a perforate inner tubular wall and an outer perforate tubular wall forming a shell,.a homogeneous fiber filler between said walls, said inner wall having integral outwardly offset portions at opposite ends thereof embedded. in said filler in a manner to compress a portion of said filler between said offset portions and said shell to support the same ang prevent settling thereof.

2 A cylindrical filter comprising a perforate shell of a pair of radially spaced inner and outer walls, one of said walls at an end thereof having 'oifset portions extending toward the other wall,

L. GILMORE,

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