US1919448A

US1919448A - Filter

Info

Publication number: US1919448A
Application number: US428575A
Authority: US
Inventors: Victor C Norquist; Earl E Treanor
Original assignee: Butler Manufacturing Co
Current assignee: Butler Manufacturing Co
Priority date: 1930-02-15
Filing date: 1930-02-15
Publication date: 1933-07-25
Anticipated expiration: 1950-07-25

Description

J11)"25, 1933. v. c, NoRQUAlsT Er AL 1,919,448

FILTER y Filed Feb. 15, 1930 BY Qr/ f Ffa/Par f rammed July z5, 1933 UNITED STATES PATENT oFFicE VICTOR, C. NORQUIST AND EARL E. TBEANOR, OF KANSAS CITY, MISSOURI, ASSIGNORS T BUTLER MANUFACTURING COMPAN TIOlI OIEv MISSOURI n Y, OF KANSAS CITY, MISSOURI, A GORPORA- FILTER Application led February 15, 1930. Serial No. 428,575.

This invention relates to improvements in filters and refers more particularly to ,filters adapted to remove solid suspended material from dry cleaning solvents, such filters adapted to be connected into dry cleanlng systems, and used to receive the discharge upper portion of the lter surrounding thev shaped deposits,

from the washers to separate the dirt and solid ymaterial prior to subsequent separation of the materials in solution, .such as soap or the like, taken out by chemicals orv by distillation. It may also be used as a separate unit in a cyclic dry cleaning system wherein the filter is the sole purifying dev1ce. l

The novelty in the invention lies primari- 1y in the use of a vertical container having a collection chamber in the bottom thereof in which is maintained a relatively stagnant pool where the dirt and spent filter cake are accumulated; furthermore, the construction permits of a downward flow of the materials in their passage through the lilter and an arrangement ,of vertical leaves connected to a manifold near the bottom of Vthe housing or casing which produces a more uniform deposit of the filter aid 3 upon the leaves, distributing the line and coarse particles uniforml and eliminating the accumulation of the lter aid upon the leaves in pearthus producing more eilicient operation and bringing into eiect the entire surface of the individual leaves for the iltering action. This construction permits fiushing out the spent filter cake and dirt from the bottom chamber of the lter without disturbing the solvent in the filter leaves.

In the drawing Figure 1 is a perspective view of m device showing portions of the casing bro en away; Figure 2 is a horizontal section taken about midway the top and bottom of the device; and Fig. 3 is a vertical section taken through th`e pipe 15 and transversely thereto showing the mounting of the ilter leaf on the conduit 15.

Referring to the drawing, the lilter consists of a housing or cylindrical casing 1 positioned upon legs or standards 2. The

top edge is grooved to receive a head 3 which makes a pressure-tight joint with the to of the housing. This-housin is held in p ace by means of a plurality o clampinof screws 4 pivoted to lugs 5 extending out from the housing, and hand wheels 6 which are screwed onto the clamping bolts 5 and contact the outer fiange of thehead. In order to facilitate the removal of the head an arm 7 is attached to the center of the head and is pivoted on an upright bar 8 to the lower extremity of which is alixed a rack 9. This upright bar or stanchion ma be raised and lowered by means of a han le 10 operating a gear within the casing 11 which meshes with the rack 9. A support member 12 is affixed to the side of the housing and holds the upright bar 8 and gear casing 11.

A hand hole plate 13 held in position by a yoke 14 serves as a clean-'out opening for the bottom vof the ilter and may be used to supplement the flushing operation hereinafter described.

Through the lilter container or casing, somewhat above the bottom thereof, extends a discharge manifold 15, and in this discharge manifoldare a plurality of openings which are bored with a shoulder such as shown in Fig. 3 to receive the slip joint nipple 16 which is attached to the bottom of each one of the lter leaves.

vThe filter leaves as shown in Figs. 1 and 2 are a plurality of plates consisting of an outer Jframe 17 which surrounds a central coarse-meshed screen 18 having a finer meshcd screen 19 on both sides of the heavier meshedV screen. The finer mesh is preferably woven from metal which is non-corrosive to moisture or acid. As suggested, the slip joint nipples by means of which the leaves are positioned in the manifold are attached to the metal of each leafv along the bottomedge of the frame. The leaves' are of the same height and vary in widthaccording to their position within the cylindrical casing.

Entering at'the back of the lter is an inlet pipe 2 which divides itself into a Y within the filter casing, the ends of lthe Y being upturned to form the stand pipes 21 and 22. At t/he bottom of the filter is a Monel metal wire or other discharge pipe 23 controlled by a valve 24. Also connected into' the casing below the manifold 15 are two pipes, one a solvent or sludge drawoff pipe 25 and the other a water inlet pipe 27 regulated by a valve 28.

In operation the filter is hooked into the reclaiming portion of a dry cleaning system so that the discharge from the washer is connected to the yinlet pipe 20. The dis charge pipe 15 from the manifold is connected back to the washer to return clean solvent back to the washer or to a clarifier or still by means of which the solvent is relieved of materials in solution. There is added to the cleaning solvent a material known as a filter aid in the art, consisting of diatomaceous earth or other finely dividedf material which is carried along in suspension in the solvent and is deposited in the form of a layer upon the surfaces of the filter leaves. The solvent with this material in suspension passes through the inlet pipe 20 and is discharged into the top of` the filter throu h the pipes 21 and 22. When the filter as been filled with liquid the liquid solvent, due to the pressure of the incoming solvent, will be discharged by passing through the fine screens andl thence through the discharge nipples 16 into the manifold 15. In passing t rou h the filter leaves a layer or filter ca e will deposited upon each of the leaves ofthe filter.

Whenhthe filter leaves have been given what is Aknown as a pre-coat of filter aid material, 'the filter isthen ready to be used in the system, the circulation upto this time being merely for the purpose of depositing the lter aid upon the leaves of the filter. After a batch of garments has been washedf in', the washer the dirty or soiled solution containing deleterious matter including dirt, thread and particles of cellaneous substancesinl suspension, is carried with l,the solvent into the filter and there deposited upon the leaves of the lter with the filter aid. This operation is continued with suc cessive batches of garments, a filter being connected with one or more washers, accordin to its capacity. In this way the filter ca e gradually builds up on the outer vsurface of the leaves of the filter and in time` the accumulation will fill up the space between the leaves. This may be ascertained by the increase in pressure which is necessary to cause the solvent to pass through the lter. When this pressure becomes eX- cessive, tem, the top removed and the leaves scraped by means of 'a narrow hoe-shaped instrument which passes down between the leaves and i'removes the cake from the outside surface of the leaves, permitting it to gravitate to the bottom of the container, or what is termed the spent cake chamber of the filter. This removal of the filter cake is re-v the filter may be cut out, of the syspeated from time to time as is necessary until the filter aid and dirt scraped from the leaves accumulates in the spent cake chamber of the filter to such'an extent that it is built up to the bottom of the leaves. At this time the filter is again cut out of the system by valves on the inlet and discharge pipes after which the valve 24 in the waste line 23 is opened and water under tap pressure is introduced through the pipe 27 by manipulating the valve 28. This water flushes out the dirt and filter cake which has accumulated in the bottom of the chamber Without disturbing the solvent which stands in the filter above the manifold 15. The i11 troduction of the flushing water may be by' means of a spray nozzle at theI end of the pipe within the container, which will spray the entire inside surface of the chamber. When this accumulated filter cake and dirt has been eliminated from the bottom of the filter the valve 28 is closed apd vthe valve 29 in the relief line 30 connected into the housing near its closing is opened, which permits air to pass intothe container, draining out through, the bottom waste ipe 23 the water used or flushing out thefilter cake. When this water andadirt has been discharged, the valve 24 is again closed and additional solvent is added through pipe 20 to fill the filter, valve 29 being open. Valve 29 is then closed and the filter is again ready to go into operation. A pressure gauge 31 is connected into the sideof the filter to designate the pressure'maintained thereon at all times.

It is recognized that heretofore it has been common practice to remove suspended material from solvents by means of leaves connected into a manifold in this manner, but the arrangement by means of which the solvent is circulated downwardly through a container with a spent filter cake ,chamber below the leaves of the filter and positioned so that the filter cake and dirt may be fiushed out of the filter without disturbing and draining the solvent, afford an operation not heretofore contemplated in dry cleaning systems. The down flow system serves to evenly distributethe filter aid upon the leaves of the filter without accumulating the pear-shaped deposits as it usuall does where the up flow arrangement is use By introducing the solvent at the to of the lfilter there is eliminated agitation o the dirty solvent which accumulates in the bottom where the stagnant filter aid accumulates with the dirt scraped from the leaves.

The solvent sludge drain 25 is connected into the filter just below the manifold in order that the solvent may be drained from the filter without disturbing the filter cake accumulated in the bottom of the filter. The hand holeplate 13 is unnecessary normally to remove the filter cake which can readily' be flushed from the chamber. It is, however,

a plurality of spaced filter screens disposedl Within said container, comprising triple ply screen leaves, the central screen being coarse in texture and adaptedto support flner mesh outer screens, said screens being made of Monel metal or similar non-corrosive metal, frames supporting said lter screens, fittings adapted to permit the passage of liquid therethrough secured to said frames, and communicating with the inter-screen area, an outlet manifold positioned substantially diametrically across within and atthe lower end of said container adapted. to support said screens and provided with seats for said fittings, an inlet pipe for the fluid to be filtered, a standpipe positioned within said container and communicatingv with said inlet pipe, said standpipe having an outlet in the upper portion of said container, whereby the iiow of liquid is downward whereby agitation of the sediment is precluded and an even distribution of a ilter aid is effected.

2. A ilter as in claim 1 including in combination a drain for withdrawn sediment which collects in the bottom of said container and a Hush pipe for Washing out said filter bottom.

VICTOR C. NORQUIST. EARL E. TREAN OR.