US3640392A

US3640392A - Pressurized liquid-filtering apparatus

Info

Publication number: US3640392A
Application number: US38784A
Authority: US
Inventors: Edward A Smith; Arnold V Baldwin
Original assignee: GAF Corp
Current assignee: MARINE MIDLAND BANK NA; GAF Corp
Priority date: 1970-05-19
Filing date: 1970-05-19
Publication date: 1972-02-08
Anticipated expiration: 1989-02-08
Also published as: ES194083Y; CH528289A; DK136403C; NL7706202A; DE2124717B2; FR2091631A5; DK136403B; GB1357131A; GB1357132A; BE767298A; ZA713213B; DE2124717A1; SE378994B; ES194083U; ES391262A1; JPS5036503B1; CA988440A; DE2124717C3; NL7106796A

Abstract

A vessel having a cover connected thereto by a unique hinge contains a basket supported filter bag for filtering liquid under pressure that enters the mouth of the bag through an inlet in the cover and is discharged through an outlet in the bottom of the vessel. The hinge is provided with a liquid inlet passage which communicates with a liquid supply plumbing connection which is permanent and need not be disturbed when the cover is arriving open, or closed. The cover contains a manifold that serves not only as a liquid inlet, but also as a handle. Annular seals caused by the rim of the basket are located on the annular wall of the body of the vessel so that when the cover is simply closed and clamped, leakage of the pressurized liquid is prevented above the bag, as well as from the vessel itself.

Description

United States Patent Smith et al.

[54] PRESSURIZED LIQUID-FILTERING APPARATUS [72] Inventors: Edward A. Smith, Glenville; Arnold V.

Baldwin, Wilton, both of Conn.

[73] Assignee: GAF Corporation, New York, N.Y.

[22] Filed: May 19, 1970 [21] Appl. No.: 38,784

[52] US. Cl ..2l0/232, 210/251, 210/445, 210/451, 210/452, 210/453, 55/373, 55/376,

[51] Int. Cl ..B0ld 29/10 [58] Field of Search..................210/232, 251, 445, 450, 451, 210/452, 453, 242; 55/502, 373, 374, 376, 378,

[56] Reierenoes Cited UNITED STATES PATENTS 2,851,164 9/1958 Morino ..2 10/453 X 2,569,958 10/1951 Struve et al 2,836,045 5/1958 Smith ..210/232 X 1 Feb. 8, 1972 Olson ..210/232 Primary Examiner-Samih N. Zaharna Assistant Examiner-Frederick F. Calvetti Attorney-Samson B. Leavitt and Martin Smolowitz [57] ABSTRACT A vessel having a cover connected thereto by a unique hinge contains a basket supported filter bag for filtering liquid under pressure that enters the mouth of the bag through an inlet in the cover and is discharged through an outlet in the bottom of the vessel. The hinge is provided with a liquid inlet passage which communicates with a liquid supply plumbing connection which is permanent and need not be disturbed when the cover is arriving open, or closed. The cover contains a manifold that serves not only as a liquid inlet, but also as a handle. Annular seals caused by the rim of the basket are located on the annular wall of the body of the vessel so that when the cover is simply closed and clamped, leakage of the pressurized liquid is prevented above the bag, as well as from the vessel itself.

13 Claims, 2 Drawing Figures PATENIED FEB am:

SHEET 1 OF 2 INVENTORS Edward A. Smith Arnold V. Baldwin I rromvev mammrm am y 3.640.392

SHEET 2 BF 2 Pre ssurized LlqUld Supply INVENTORS Edward A. Smith Arnold V. Baldwin ATTORNEY PRESSURIZED LIQUID-FILTERING APPARATUS This invention relates to pressurized liquid-filtering apparatus, and more particularly to filter bag pressure vessels.

In the past pressurized liquid-filtering vessels comprised liquid filling supply pipelines which required disconnect couplings, flexible hoses, or other types of means for manually disconnecting the liquid inlet line in order to open the top of the vessel. Such disconnections and connections of the plumbing for gaining access to the filter bag involved considerable downtime of the apparatus. The old apparatus was also expensive because of the sealing arrangements which required groove-machining of the cover and adjoining parts to control unwanted leakage of the liquid being filtered.

The main object of this invention is to solve such problems of the prior art by the provision of a permanent plumbing connection for the pressurized liquid which does not interfere with easy opening of the vessel for inspection, replacement of the filter bag, and cleaning.

Another object is to provide pressurized liquid-filtering apparatus that is simple in construction and use, affords quick access to the filter chamber between filtering cycles, and is inexpensive to make and operate.

A further object is to provide a filter bag pressure vessel having improved liquid O-ring sealing means between the cover and the rims of the bag and body of the vessel, comprising a removable multichannel flange member on the basket for the O-rings.

Briefly according to the invention there is provided a liquid pressurized vessel for filtering liquid through a basket backed filter bag therein, comprising a saving cover having a passage for conducting the liquid into the mouth of the bag from a hinge member through which the liquid flows into the vessel. Thus, the cover can be closed and opened without disturbing the external plumbing by means of which liquid under pressure is supplied to the vessel during the filtering cycle.

in one modification the hinge itself constitutes a liquid inlet way through the axis thereof, whereas in another preferred modification the liquid inlet way is established and sealed adjacent the actual hinge upon closure of the cover. In any case the hinged cover contains a manifold that serves as a hinge member, inlet pipe and handle as integral parts.

A unique sealing means is provided for preventing liquid leakage from the joint when the cover is closed, as well from one side of the rim of the filter bag to the other directly under the cover during the filtering operation, comprising a removable flange member having multiple O-ring sealing channels. The flange member constitutes the rim of the basket in which the filter bag nests, and is removable from the vessel with the basket and bag.

In the drawings:

FIG. 1 is fragmentary view namely in perspective with parts broken away of a filter bag pressure vessel illustrative of the invention.

FIG. 2 is a similar view of a modification.

Referring to FIG. 1 there is shown a vessel comprising a hollow body or shell 12 having an outlet 14 in the concavoconvex bottom thereof, and a cover 16 hinged by a transverse pin 18 to a lateral bracket 20 that is secured to the upper side of shell 12. The top of the body 12 is provided with an integral annular rim 22 having onwardly and outwardly extending

flanges

24 and 26, respectively; and a flat upper annular surface 28. Resting on the surface 28 is a multichannel ring or flange member 30 having a downwardly extending inner flange 32 which fits the inner annular surface of the body flange 24.

The flange 32 is connected to and supports the upper rim of a basket 34 comprising a screen for backing and restraining a filter bag 36 therein, having an upper ring or head 38 about which the material of the bag is bound so as to have an inner annular depending flap 40. The ring or flange member 30 is provided with an inwardly and upwardly facing groove 42 in which the bag-material-bound ring or head 36 nests when forced downwardly by the smooth under surface 44 of the cover 16. The flange member 30 is also formed to provide a downwardly opening channel 46 an an upwardly opening channel 48 in which concentric inner and outer O-

rings

50 and 52, respectively, are disposed. The O-rings are composed of rubber or soft plastic, and are somewhat greater in width or thickness than the depth of the channels, so that when the cover 16 is closed, they are compressed between the smooth under surface 44 of cover 16 and the smooth annular surface 28 to form a good seal. The bottom of inner O-ring is also pressed against the flat annular surface 28 of flange 24 while the top O-ring is pressed against the flat annular surface 44 on cover 16. Stop bars 76, in turn, keep the basket 34 properly spaced from the cylindrical wall of the body 12, so that the liquid after being filtered can flow freely downwardly in th resulting cylindrical space.

A spacer plate 54 is mounted on the bracket 20 under liquid inlet manifold 56 of cover 16. The plate 54 is provided with a liquid inlet pipe 58 which is connected to pressurized liquid supply 59 in internal communication with a corresponding hole 60 in the plate 54, so that when the cover 16 is closed liquid under pressure flows along the path of arrow 62 from inlet pipe 58 into manifold 56. An O-ring 64 located in an annular groove 66 in the plate 54 at the edge of the hole 60,

prevents any leakage of the pressurized liquid in such area.

The liquid to be filtered enters the filtering chamber through a central opening 68 in the cover 16 and then flows into the open mouth of filter bag 36. The manifold 56 is rectangular in cross section and extends somewhat beyond a front end wall 70 of the liquid passageway, to provide a convenient handle 72 for lifting the cover 16. The rear end of such manifold is closed by a rear end wall 74. A stop bar 76 and centering guides 78 assure proper closure of the cover with respect to the annular sealing means on the body 12 under the cover 16, in which position the parts are clamped by holddown bolts 80 on the body 12, in corresponding recesses 82 in the cover 16.

Referring to FIG. 2, there is shown a modification in which the cover 84 is pivoted to the body 86 of the vessel 88 by

jointed pipe elbows

90 and 92. The elbow 92 is stationary and fixed with respect to

hinge brackets

94, 94 mounted on the side of the upper wall of the body 86. Hinge Brackets 96, 96 are secured to the cover 84 and connected to the corresponding stationary brackets by

hinge pins

98, 98, the longitudinal axes of which coincide with each other and axis of the rotation of elbow 90 when the cover 84 is swung open, or closed.

Stationary elbow 92 is permanently connected to the pressurized liquid supply 93, while the elbow 90 is connected by a short pipe 100 and an elbow 102 to the central hole 104 in cover 84. Thus, the pipe 100 serves also as a handle for the cover 84. Clamps 106 are provided for securing the cover 84 to the body 86 during the filtering cycle. The sealing assembly between the cover 84 and top of the body 86 preferably is like that shown and described in connection with FlG. l.

The advantages of this top filling pressure is that permanent conventional plumbing can be employed. The arrangement of sealing and manifold head or top cover of the vessel, allows easy access by the simple hinge arrangement, allowing the cover to be raised and lowered thus exposing the entire inside of the vessel. Further advantage is that a minimum of components are employed: vessel, restrainer basket and filter bag, in a simple, clean arrangement, so that the inside of the vessel shell is smooth and fully exposed, thus greatly facilitating cleaning. The advantage of containing contaminates in the bag for easy disposal is a nucleus of the invention. Added advantages are ease of disposal of contaminate, minimum downtime in changeover, minimum effort in time, labor and clean liquids to clean the vessel.

Employing fixed spacers and a solid rim on the top of body or shell of the vessel provides the dual function of centering the restrainer basket in a fixed position, plus acting as a stop for the cover in the closed position. The stop bar function is predetermined and fixed to insure effective and even sealing pressure on the seals (O-rings).

Conventional gasketing requires costly machining of grooves in the cover and shell of the vessel which is eliminated by this invention. Designed into the flange area of the restrainer basket are grooves to retain O-ring seals. This is accomplished by a simple, inexpensive method of manufacturing, such as, stamping, hydro-forming, spinning, etc.

Not only are the O-rings contained in the restrainer basket, but a ledge is also provided on the ID. of the flanged area of the basket to contain the open end of the filter bag. The filter bag is supported by the semirigid, or rigid ring forming the open neck of the bag. The pressure and weight of the liquid flowing in the bag is sufficient to cause effective sealing of the bag to the flange ledge thus preventing bypassing or leakage of liquid. ln this manner the top O-ring prevents the liquid from bypassing, but a small ring of contaminate tends to build up on the flange between the bag neck and the O-ring. To prevent this and to insure that all contaminates are contained in the bag, the bag ledge is designed so that the cover of the vessel exerts a slight pressure on the bag neck.

The vessel is made ready for operation by inserting the restrainer basket containing the filter bag and lowering the cover. Swing bolts with bar knobs are adjusted to hold down the cover. The amount of sealing compression is regulated by the centering" stop bars, therefore tightening of the bolts can be accomplished rapidly and confidently by hand to effect sealing without damage to the seals by over or uneven tightening.

The invention lends itself to complete vessel ranges accommodating from miniature to multibag applications as well as variations within a given vessel.

A vessel normally accepting a filter bag having 3 sq. ft. of area may be modified internally to contain bags having 6 or as much as 9 sq. ft. of area, with the bag maintaining a simple sleeve or core shape.

This can be accomplished by doubling or tipling back on itself, the wall of the restrainer basket. An appropriately longer bag will then drape itself over the walls. Subsequent to this, multiholes in a larger diameter vessel could contain an appropriate number of restrainer baskets of either, for example, 3, 6 or 9 sq. ft. area to obtain a large variety of combinations of filter areas in a minimum of space. Even though a multivessel is employed, a single 3 sq. ft. area bag could be used in the vessel if desired. The O-ring seals in the restrainer would in such case effectively seal off the ports not in use.

What claimed is:

l. Pressurized liquid-filtering apparatus comprising, in combination,

a vessel having a liquid-filtering chamber provided with a cylindrical wall and a liquid outlet in the bottom thereof;

a cover hinged to said wall for closing the top of said vessel and providing ready and complete access to the filtering chamber when the cover is swung open;

hinge means comprising means for conducting liquid under pressure to the top of such filtering chamber through an opening in said cover when the latter is closed;

permanent external plumbing connection means for supplying liquid under pressure to said hinge liquid-conducting means,

a basket comprising an annular upper flange member for supporting the basket in such chamber on the top of said cylindrical wall with a uniform cylindrical space between such wall and the basket, said flange member having an inwardly and upwardly facing groove therein,

a filter bag having a ring bound in the upper edge thereof disposed in said basket with such upper edge partially nested in such groove in the flange member,

multiple O-rings associated with said flange member for sealing the annular space between the inner surface of said cover and the top surface of said wall when the cover is clamped-closed, and

manually operable means for clamping said cover on the top of said cylindrical wall, with the upper edge of the bag compressed between the cover and flange member.

2. The invention as defined by claim 1, in which said O-rings are disposed in concentric relationship to each other and to said flange member, with an annular portion of the latter separating said O-rings.

3. The invention as defined by claim 2, in which said flange member comprises a downwardly opening channel containing one O-ring in contact with the top of said wall adjacent the inner edge thereof, and an upwardly opening channel containing the other O-ring in contact with the under surface of the cover when closed, and

the entire O-ring and flange member assembly is removable with the basket and bag when the cover is open, yet provides highly effective seal when the cover is closed and clamped in such position.

4. The invention as defined by claim 3, in which said cover comprises a liquid inlet manifold having a handle portion at the inner end thereof, and a hinge portion at the outer end thereof.

5. The invention as defined by claim 1, in which said hinge means includes a stationary pipe elbow and a movable pipe elbow connected to the stationary elbow by a joint permitting the cover to be swung open and closed about the axis of the hinge means without breaking such joint,and

a short pipe and elbow connecting the opening in the cover to said movable elbow.

6. A vessel for filtering liquid under pressure comprising, in

combination:

a hollow body having a cylindrical sidewall merging into a concavo-convex lower portion provided with an outlet at the bottom thereof,

a cover for the top of said body having a central liquid inlet therein;

hinge means connecting said cover to said body for swinging movement of the cover upwardly and lateral about a fixed axis to completely swing-open the top of said body;

clamp means for securing said cover in closed position on said body;

a removable filter bag in said body opening upwardly to the liquid inlet in said cover;

plumbing means for delivering liquid to be filtered under pressure through such liquid opening in the cover, comprising a stationary elbow having one arm concentric with such fixed axis, a swingable elbow having a corresponding arm that is also concentric with such axis, and seal-means connecting said arms of the stationary and swingable elbows whereby said cover can be opened and closed by a swinging movement about such axis without breaking said seal means upon release of said clamp means and opening of the cover to provide access to said filter bag.

7. The invention as defined by claim 6, in which said cover comprises a short pipe that serves as a handle a liquid inlet passage connecting the other arm of said swingable elbow with the liquid inlet in said cover.

8. The invention as defined by claim 1, including a screen-bracket for restraining said filter bag comprising an upper rim connected thereto, said rim having a horizontal annular flange having a downwardly facing inner channel and an upwardly facing outer channel overlapping the annular flat top surface of said body,

said body having an internal annular top flange the inner wall surface of which fits the corresponding lateral surface of said rim,

a liquid sealing O-ring located in each of said annular channels for effective sealing contact with the under surface of said cover and the inner-upper edge of said body flange, respectively, when the cover is closed and secured by said clamp means.

9. The invention as defined by claim 8, in which said rim is provided with an annular L-shaped groove between said inner channel and the inner wall of said rim, which groove faces inwardly and upwardly, and

said filter bag comprises an upper bead having an inner downwardly depending flap,

whereby said bead sets snugly in such groove when the bag is located in said basket, and provides an additional seal when the cover is closed.

10. The invention as defined by claim 9, in which means are also provided between said cover and body for limiting the downward movement of said cover with respect to said rim flange for protecting the latter when said clamp means are tightened, and for also guiding the cover vertically as the latter is finally closed.

H. The invention as defined by claim 10, in which a hinge bracket is mounted on the vessel having a spacer plate for separating the back portion of the under surface of the cover a predetermined distance from the top of said annular wall when the cover is clamped closed,

said plate having a hole in communication with a corresponding hole in the cover;

means including an O-ring for sealing the joint between such holes when the cover is closed;

a manifold mounted on said cover having a longitudinal passage for carrying liquid under pressure from such hole to the central opening in said cover;

said manifold comprising a handle for said cover, and a hinge member therefor; and

a transverse pin connecting said hinge member to said hinge bracket, permitting the cover to be swung upwardly and backwardly about the axis of said pin.

12. The invention as defined by claim H, in which a stop bar and cover centering guides are provided between the body and cover adjacent the front thereof.

13. A sealing O-ring and basket assembly in combination with a pressurized liquid-filtering vessel having a top cover hinged to the body thereof, comprising a flange member having contiguous concentric individual upwardly and downwardly facing channels, said channels being provided with upwardly and downwardly facing grooves and a third groove for carrying an enlarged bead constituting an upper rim of a filter bag, said cover being constructed and arranged to coact with said enlarged bead and said third groove, corresponding O-rings carried in said channels for sealing contact with the undersurface of said cover and the top surface of a cylindrical wall of said body when said cover is closed, and a basket comprising a screen depending from said flange member into the filter chamber of said body for containing a filter bag therein, whereby the assembly can be manually inserted in and removed from the body as a unit when the cover is opened.

UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION PATENT NO.

DATED February 8, 1972 INVENTOR(S) Edward A. Smith and Arnold V. Baldwin It is certified that error appears in the aboveAdentified patent and'that said Letters Patent are hereby corrected as shown below: IN THE DRAWINGS Change the lead lines of ref identify the brackets havin erence numerals 94 to In Fig. 2:

g hinge pins 98, in accordance with the Pressurized Liquid Supply following corrected drawing:

and that said Letters Patent are hereby corrected as shown below':

UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent: No. 3 ,640 .392 Dated February 2L 1972 Page 2 Inventor(s) Edward A. Smith et al.

It is certified that error appears in the above-identified patent IN THE CLAIMS Claim 8 line 2 delete "screen-bracket" and replace with screen-basket I Signed and Scaled this twenty-third Day Of Setember 1975 [SEAL] Arrest:

RUTH c. MASON c. MARSHALL DAN N I [Hg -Hiver (mnmissiunvr of Parents and Trademarks

Claims

1. Pressurized liquid-filtering apparatus comprising, in combination, a vessel having a liquid-filtering chamber provided with a cylindrical wall and a liquid outlet in the bottom thereof; a cover hinged to said wall for closing the top of said vessel and providing ready and complete access to the filtering chamber when the cover is swung open; hinge means comprising means for conducting liquid under pressure to the top of such filtering chamber through an opening in said cover when the latter is closed; permanent external plumbing connection means for supplying liquid under pressure to said hinge liquid-conducting means, a basket comprising an annular upper flange member for supporting the basket in such chamber on the top of said cylindrical wall with a uniform cylindrical space between such wall and the basket, said flange member having an inwardly and upwardly facing groove therein, a filter bag having a ring bound in the upper edge thereof disposed in said basket with such upper edge partially nested in such groove in the flange member, multiple O-rings associated with said flange member for sealing the annular space between the inner surface of said cover and the top surface of said wall when the cover is clamped-closed, and manually operable means for clamping said cover on the top of said cylindrical wall, with the upper edge of the bag compressed between the cover and flange member.

3. The invention as defined by claim 2, in which said flange member comprises a downwardly opening channel containing one O-ring in contact with the top of said wall adjacent the inner edge thereof, and an upwardly opening channel containing the other O-ring in contact with the under surface of the cover when closed, and the entire O-ring and flange member assembly is removable with the basket and bag when the cover is open, yet provides highly effective seal when the cover is closed and clamped in such position.

5. The invention as defined by claim 1, in which said hinge means includes a stationary pipe elbow and a movable pipe elbow connected to the stationary elbow by a joint permitting the cover to be swung open and closed about the axis of the hinge means without breaking such joint, and a short pipe and elbow connecting the opening in the cover to said movable elbow.

6. A vessel for filtering liquid under pressure comprising, in combination: a hollow body having a cylindrical sidewall merging into a concavo-convex lower portion provided with an outlet at the bottom thereof; a cover for the top of said body having a central liquid inlet therein; hinge means connecting said cover to said body for swinging movement of the cover upwardly and lateral about a fixed axis to completely swing-open the top of said body; clamp means for securing said cover in closed position on said body; a removable filter bag in said body opening upwardly to the liquid inlet in said cover; plumbing means for delivering liquid to be filtered under pressure through such liquid opening in the cover, comprising a stationary elbow having one arm concentric with such fixed axis, a swingable elbow having a corresponding arm that is also concentric with such axis, and seal-means connecting said arms of the stationary and swingable elbows whereby said cover can be opened and closed by a swinging movement about such axis without breaking said seal means upon release of said clamp means and opening of the cover to provide access to said filter bag.

8. The invention as defined by claim 1, including a screen-bracket for restraining said filter bag comprising an upper rim connected thereto, said rim having a horizontal annular flange having a downwardly facing inner channel and an upwardly facing outer channel overlapping the annular flat top surface of said body, said body having an internal annular top flange the inner wall surface of which fits the corresponding lateral surface of said rim, a liquid sealing O-ring located in each of said annular channels for effective sealing contact with the under surface of said cover and the inner-upper edge of said body flange, respectively, when the cover is closed and secured by said clamp means.

9. The invention as defined by claim 8, in which said rim is provided with an annular L-shaped groove between said inner channel and the inner wall of said rim, which groove faces inwardly and upwardly, and said filter bag comprises an upper bead having an inner downwardly depending flap, whereby said bead sets snugly in such groove when the bag is located in said basket, and provides an additional seal when the cover is closed.

11. The invention as defined by claim 10, in which a hinge bracket is mounted on the vessel having a spacer plate for separating the back portion of the under surface of the cover a predetermined distance from the top of said annular wall when the cover is clamped closed, said plate having a hole in communication with a corresponding hole in the cover; means including an O-ring for sealing the joint between such holes when the cover is closed; a manifold mounted on said cover having a longitudinal passage for carrying liquid under pressure from such hole to the central opening in said cover; said manifold comprising a handle for said cover, and a hinge member therefor; and a transverse pin connecting said hinge member to said hinge bracket, permitting the cover to be swung upwardly and backwardly about the axis of said pin.

12. The invention as defined by claim 11, in which a stop bar and cover centering guides are provided between the body and cover adjacent the front thereof.