US2952331A - Filtering apparatus for exhaust pumps - Google Patents

Description

Sept 13, 1950 E. J. BEACH 2,952,331

FILTERING APPARATUS FOR EXHAUST PUMPS Filed April 20. 1959 U INVENTOR.

EDWARD d. BEACH A WTO/@V677 `United States Patent() FILTERING APPARATUS FOR EXHAUST PUlVIPS EdwardV J. Beach, Brooklyn, N.Y., assignor to Beach- Russ Company, New York, N.Y., a corporation of New York` Y Filed Apr. 20, 1959,'Ser. No. 807,622

'6 Claims. (Cl. 183-34) This invention concerns an apparatus for liltering exhaust pump oil vapors in the form of oil smoke, mist or smog. K According to the invention there is provided a casing through which the vapors are passed. The casing includes a pair of screens between which is disposed a lam- 'inatedstructure consisting of Woven or knitted metallic :hair liltermembers and layers of rock wool. This material. is, made from slag which is aV residue of various ore rening processes. Instead `of rock wool it is possible to use Fiberglas. The consistency of the material must be precisely `controlled for optimum flteringresults.

It is a principal object of theinvention to provide a ltering apparatus employing a lirst fluid dispersion mem- '.ber in the path of a vapor to be ltered, a metallic hair lter unit and a mass of fibrous material, in the path of the vapor to be filtered. Y KA further object is the provision of filtering vapparatus rf or straining and filten'ng'a'n oil Vapor so that clean` air "is discharged fromthe apparatusk and the liquids are retained and drained olf. 'v Y Y Another object is the provision of a filtering apparatus Iin which a first metallic hair filterY unit is disposed on a Ametal apertured'vapor dispersion`screen,` a plurality kof layers of rock wool are disposed Von the hair unit, a second hair filter unit is'superimposed on the -top layerl of trock wool, another plurality of layers vofrock woolare :disposed on theseond hair unit; and a `secondfapertured .screen is located over the topA layer of rockwool.

',For further comprehension of thev inventi-om and of .the objects 'and advantages" thereof, reference will be had to the following description'and accompanying draw- AingsQand to the appended claimsin which the various novell features ofthe invention are more particularlyA set forth.

` In the accompanying drawings forming a material part 'of thisdispclosure: f'

' Eig. 1 is atop plan view ofV a ing the invention. f f

' Fig. 2 is a'longitudinal sectional view takenon line 2-2 ofrFig. A1. 1 '1 p Referring to the drawings'there is shownY a substantially closed, kgenerally cylindrical casing` disposed with its axis'in a vertical position. The casing has-a topclosed by a cover plate 14. The plate is pivotally secured'tc 'a sector plate 16 attlie top of the casing by hinge f18. vBolts 20 are removably threaded in a'radiallyextending annular flange 22 at the top'of the casing-for holding 'the cover securely closed. The plate 16 hasfa stub sleeve `17 which supports an exhaust pipe 24 from which clean air or` other gas is exhausted fromV the casing. nThe cover lter apparatus embodyvhasahandle25.-` The casing is supported `apart 'aroundthe =casing-and kresting onAbedplates 27. f Fitted into the 'centerkof Vthefdished bottomv'vall, 28 of upon three legs 26 vspaced l20 the casing is an inlet pipe 30. This pipe hasa plurality of-.y circumferentally spacedfholes inIi-ts wall.j Thle holes permit communication betweenthe'pipe 3'0 and a ICE lower chamber 34 in the casing. Flanges 36 at the top of chamber 34 support a first circular grid or screen 38 having one-eighth inch openings 40. The screen 38 serves as a tirst'dispersing means for the vapors discharged into chamber 34 from pipe 30. f

Disposed on screen 38 is a first circularpad or disk 42 made of knitted or woven metallic hair, such as steel or other metal wool. The consistency of this hair is such that it provides numerous interstices and tortuous paths' for vapor which are smaller than the openings 40 in vscreen 38. superimposed on disk 42 is a plurality of circular pads 44 formed of blankets of fibrous material such as rock Wool. The disks are initially larger in diameter than the casing 10 so that when inserted in the casing the disks lit snugly `at the inner Wall of the casing. About midway between top and bottom of the casing and disposed on the uppermost disk 44 is a second knitted metallic hair pad or disk 46, similar to disk 42. Upon this disk 46 is another mass of fibrous material, preferably -a plurality of pads 48 of rock wool.

A pair 0f flanges 50 support a second apertured screen 52 over the pads 48. Screen 52 is spaced a short distance from the top of the casing to define an upper collecting chamber 54 which opens into pipe 24. y

The inlet pipe 30 receives oil vapors to be liltered from an exhaust pipe 56 of -a vacuum pump or the like. A branch pipe 58 axially aligned with pipe 30 serves as a trap leg for liquid condensate. This leg has a drain housing 60 provided with a drain cock 62. A drain pipe 64 is secured to the casing and opens into the bottom of chamber 34. This pipe has a drain cock 66 and a pressure relief valve 67. 'In assembling the apparatus it is important that the several filtering elements have interstices which are suiciently large to prevent undue pressure in the iilter assembly and back pressure at pipe 30. At the same time, the interstices must not be so large as to permit oil drops to pass With the exhaust air through the filter. To obtain optimum filtration results, the rock Wool fibers must have an 'averagedensi-ty overall of live to ten grams per cubic inch of filter pad. The several pads may be stamped,

' punched or otherwise formed from rock Wool blankets.

The lower disk 42 may be of coarser metallic hair than the upper disk 46. The pads or disks 42 and 46 are preferably formed of knitted wire mesh which provides the necessary strength, flexibility, resiliency, light weight vand extensive surface area.

The separation actionof the apparatus is primarily one of impingement, with the individual Wires and fibers serv.- ing as impingement targets.

`A conical corrugated baie 68 may upper end of pipe 30 in chamber 34. f p

In. operation of the apparatus vapors to be tilteredare f-ed into pipe 30 via the inlet 56. Excess liquid, heavy drops and condensate flows down into leg 50 and Acan be drained out Via the drain housing 60. The Vapor is driven under pressure through holes 32 into chamber 34 where further condensation liquid can be drained 0E via drain cock 66. If excessive pressure should build be mounted on toV relieve the pressure. The vapor is divided into streams in passing through holes 32 in rpipe 30 and swirls around in chamber 34. The pressure of the vapor then .driveslit through the `first screen 40 which further divides the ,drawing oli` via drain cock Y66,. The vapor now relieved of larger drops passes through the fibrous,- mass. -"Ihis close packing effectively vfilters a major quantity offthe oil entrained in the` vapor. .j

The vapor now passes through wire mesh pad 46 for further division into separate streams and through a final mass of fibrous material provided by pads 48. Screen 52 acts las a hold-down member to prevent deformation of the rock wool pads I48 and as a final condensation producing member. The cleaned and strained air free of oil is then discharged through pipe 24. Due to the vertical disposition of the casing and upward travel of the vapor the filtration process is assisted by gravity.

The several screens and pads can be, removed by opening cover 14 when it is desired to clean the casing and to replace the screens -and/or pads. Cover 14 is a sector plate having a straight side shorter than the diameter of the casing and a curved side extending more than 180 of arc so that the plate is larger than one-half the circular extent of flange 22.

While I have illustrated and described the preferred embodiment of my invention, it is to be understood that I do not limit myself to the precise constr-uction herein disclosed and that various changes and modifi.- cations may be made within the scope of the invention as defined in the appended claims.

Having thus described my invention, what I claim as new, and desire to secure by United States Letters Patent is:

1. A filtering apparatus for oil Vapor, comprising a generally cylindrical casing having `a closed bottom and top, an inlet pipe opening vertically into the bottom of the casing, said casing being disposed with its axis vertical, said pipe being disposed in axial alignment with the casing, a first apertured screen mounted transversely across the casing and spaced from the bottom thereof to define a lower compartment, a first knitted wire mesh disk disposed on the screen, ya first mass of fibrous material disposed on the wire mesh disk, a second wire mesh disk disposed on said mass, a second mass of fibrous material disposed on the second disk, and a second apertured screen supported over the second mass, said second screen being spaced from the top of the casing to define an upper compartment for collecting filtered air, and an exhaust pipe secured to the top of the casing and opening into the upper compartment, a first drain connected to the lower compartment for draining liquid therefrom, and a second drain connected to said inlet pipe for draining liquid condensate therefrom, there being a vapor exhaust pipe connected to said inlet pipe at a point above said second drain, said first drain terminating in a drain cock and pressure relief valve.

2. A filtering apparatus for oil vapor, comprising a generally cylindrical casing having a closed bottom and top, Ian inlet pipe opening vertically into the bottom of the casing, said casing being disposed with its axis vertical, said pipe being disposed in axial alignment with the casing, a first apertured screen mounted transversely across the casing and spaced from the bottom thereof to define a lower compartment, a first knitted wire mesh disk disposed on the screen, a first mass of fibrous material disposed on the wire mesh disk, a second wire mesh disk disposed on said mass, a second mass of fibrous material disposed on the second disk, and a second apertured screen supported over the second mass,

said second screen being spaced from the top of the casing to define an upper compartment for collecting filtered air, and an exhaust pipe secured to the top of the casing and opening into the upper compartment, a first `drain connected to the lower compartment for draining liquid therefrom, and a second drain connected to said inlet pipe for draining liquid condensate therefrom,y there being a vapor exhaust pipe connected to said inlet pipe at a point above said second drain, said first drain terminating in -a drain cock and pressure relief valve, the first and second masses of fibrous material being formed of circular pads of rock wool having a density of five to ten grams per cubic inch, said pads tting snugly Within the cylindrical casing.

3. A filtering apparatus for oil vapor, comprising a generally cylindrical casing having a closed bottom and top, an inlet pipe opening vertically into the bottom of the casing, said casing being disposed with its axis vertical, said pipe being disposed in axial alignment with the casing, -a first apertured screen mounted transversely across the casing and spaced from the bottom thereof to define a lower compartment, a first knitted wire mesh disk disposed on the screen, a first mass of fibrous material disposed on the wire mesh disk, a second wire mesh disk disposed on said mass, 4a second mass of fibrous material disposed on the second disk, and a second apertured screen supported over the second mass, said second screen being spaced from the top of the casing to define an upper compartment for collecting filtered air, and an exhaust pipe secured to the top of the casing and opening into the upper compartment, a first drain connected to the lower compartment for draining liquid therefrom, and `a second drain connected to said inlet pipe for draining liquid condensate therefrom, there being a vapor exhaust pipe connected to said inlet pipe at a point above said second drain, said first drain terminating in a drain cock Aand pressure relief valve, the first and second masses of fibrous material being formed of circular pads of rock wool having a density of five to ten grams per cubic inch, said pads fitting snugly within the cylindrical casing, said inlet pipe having a terminal portion in the lower compartment formed with circumferentially spaced holes for initially dividing into a plurality of streams the vapor entering said lower compartment, and an inverted conical baie on the upper end of the inlet pipe.

4. A filtering apparatus for oil vapor, comprising a generally cylindrical casing having a closed bottom and top, an inlet pipe opening vertically into the bottom of the casing, said casing being disposed with its axis vertical, said pipe being disposed in axial alignment with the casing, a first apertured screen mounted transversely across the casing and spaced from the bottom thereof to define a lower compartment, a first knitted wire mesh disk disposed on the screen, a first mass of fibrous material disposed on the wire mesh disk, a second wire mesh disk disposed on said mass, a second mass of fibrous material disposed on the second disk, and a second apertured screen supported over the second mass, said second screen being spaced from the top of the casing to define an upper compartment for collecting filtered air, and an exhaust pipe secured to the top of the casing and opening into the upper compartment,- a first drain connected to the lower compartment for draining liquid therefrom, and a second drain connected to said inlet pipe for draining liquid condensate therefrom, there being a vapor exhaust pipe connected to said. inlet pipe at a point above said second drain, said first drain terminating in a drain cock and pressure relief valve, the first and second masses of fibrous material being formed of circular pads of rock wool having a density of five to ten grams per cubic inch, said pads fitting snugly within the cylindrical casing, said inlet pipe having a terminal portion in the lower compartment formed with circumferentially spaced holes for initially dividing into a plurality of streams the vapor entering said lower compartment, and an inverted conical baffle on the upper end of the inlet pipe, the bottom of the casing having a dished form, said casing being supported upon angularly spaced legs.

5. A filtering apparatus for oil vapor, comprising a generally cylindrical casing having a closed bottom and top, an inlet pipe opening vertically into the bottom of the casing, said casing being disposed with its axis vertical, said pipe being disposed in axial alignment with the casing, a rst apertured screen mounted transversely across the, casing and spaced from the bottom thereof to define a lower compartment, a iirst knitted wire mesh disk disposed on the screen, a rst mass of fibrous material disposed on the Wire mesh disk, a second wire mesh disk disposed on said mass, a second mass of brous material disposed on the second disk, and a second apertured screen supported over the second mass, said second screen being spaced fromthe top of the casing to define an upper compartment for collecting ltered air, and an exhaust pipe secured to the top of the casing `and opening into the upper compartment, a first drain connected to the lower compartment for draining liquid therefrom, and a second drain connected to said inlet pipe for draining liquid condensate therefrom, there being a vapor exhaust pipe connected to said inlet pipe at a point above said second drain, said rst drain terminating in a drain cock and pressure relief valve, the first and second masses of fibrous material being formed of circular pads of rock Wool having a density of tive to ten Agrams per cubic inch, said pads fitting snugly within the cylindrical casing, said inlet pipe having a terminal portion in the lower compartment formed with circumferentially spaced holes for initially dividing into a plurality of streams the vapor entering said lower compartment, and an inverted conical baie on the upper end of the inlet pipe, the bottom of the casing having a dished form, said casing being supported upon angularly spaced legs, the top of the casing including a first sector plate supporting said exhaust pipe, and a cover in the form of another sector plate larger than a semicircle hinged to the rst sector plate.

6. A filtering apparatus for oil vapor, comprising a generally cylindrical casing having a closed bottom and top, an inlet pipe opening vertically into the bottom of the casing, said casing `being disposed with its axis vertical, said pipe being disposed in axial alignment with the casing, a rst apertured screen mounted transversely across the casing `and spaced from the bottom thereof to define a lower compartment, a rst knitted wire mesh disk disposed on the screen, a first mass of fibrous material disposed on the Wire mesh disk, a second wire mesh disk disposed on said mass, a second mass of fibrous material disposed on the second disk, and a second apertured screen supported over the second mass, said second screen being spaced from the top of the casing to define an upper compartment for collecting filtered air, and an exhaust pipe secured to the top of the casing and opening into the upper compartment, ya first drain connected to the lower compartment for draining liquid therefrom, and a second drain connected to said inlet pipe for draining liquid condensate therefrom, there being a vapor exhaust pipe connected to said inlet pipe at a`point above said second drain, said first drain terminating in a drain cock and pressure relief valve, the rst and second masses of fibrous material being formed of circular pads of rock wool having a density of five to ten grams per cubic inch, said pads fitting snugly within the cylindrical casing,

said inlet pipe having a terminal portion in the lower comv partment formed with circumferentially spaced holes for initially dividing into a plurality of streams the vapor entering said lower compartment, and an inverted conical baie on the upper end of the inlet pipe, the bottom of the casing having a dished form, said casing being supported upon angularly spaced legs, the top of the casing including a first sector plate supporting said exhaust pipe, and a cover in the form of another sector plate larger than a semicircle hinged to the first sector plate, said casing being formed with an annular flange at its top end, said cover having a free arcuate rim secured to said ange by removable bolts for removing and replacing the screens, disks and pads.

References Cited in the file of this patent UNITED STATES PATENTS 406,603 Sutton July 9, 1889 1,677,804 Thayer July 17, 1928 1,892,982 Gartha Jan. 3, 1933 2,144,681 Kraissl Ian. 24, 1939 2,822,059 Lunn et al Feb. 4, 1958 2,886,122 Lantz May 12, 1959

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