US2229900A - Filter press - Google Patents

Description

Jan. 22, 1941. H, mm 2 4 2,229,900

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Filed July 29. 1930 3 Shuts-Shut 1 Inventor Heanra'c/z Rewz By His A ftomays 1941- I H. REJTZ 2,229,900

FILTER PRESS Filed July 29. 1939 3 anti-Shut 2 Inventor Hanna/a Reeltz By His Afforqeys V I Jan. 28, 1941. j H. Rm'rz 2,229,900

Mum! mass Filod July 29, 1939 3 Shanta-Shunt 5 Jay. 4

Inventor flenm'oh Redd:

By His Attorneys Patented Jan. 28, 1941 FILTER PRESS Helinrich Reitz, Bitterfeld, Germany, assignor to G. Farbenindustrle Aktiengesellschait,

Frankfort-on-the-Maln, Germany Application July 29, 1939, Serial No. 287,311

I In Germany November 16, 1931 3- Claims. (01. 100-50) This invention relates to improvements in or relating to illter presses and more particularly to a combined filter and hydraulic press and is a continuation in .part of my co-pending applit cation, Serial No. 79,703, flied May 14, 1936, en-

titled Filter press. Said application, Serial No. 79,703, is in turn a division of my application,

Serial No. 642,725 which has since matured into U. S. Patent No. 2,048,352.

to In the said co-pending application, Serial No.

M21725 I have described and claimed a filter press comprising a base, heads at opposite ends thereof -rigidly secured to said base and provided with integral extensions thereon directed in ls wardly towards each other and in alignment, collars in sliding and sealing engagement with the periphery of said extensions, the end face of each collar being adapted to be moved into sealing engagement with the inner face ol the till head; the collars being in alignment, hydraulically operated-means operatively connected to each collar for reciprocating the same, a ram slidably and sealingly engaged with the inner surface of each collar to form therewith and Ad with the head a filtering chamber, hydraulically operated means positioned parallel to the first named hydraulic means and adapted to recipro cate the rams, filters mounted on the inner face of the extension and the outer face oi. the ram 30 in facing relations to each other, means for the entry of a primary fluid to said chamber and another means to permit exit of a secondary fluid,

and means for operating the collar and the ram in proper sequence, said collar being moved over dd said ram and then with the ram to release the press cake after 'a pressing operation has been completed.

Theinvention, the subject of the aforesaid copending application, thus provides for the simultil taneous production of only one filter cake by each press plunger, whilst the present invention is adapted for the simultaneous production of two filter cakes by means oi one and the same press plunger, and thus enables the output the filter press to be considerably increased.

To this end, by way of modification of the invention, the subject of my co-pending application, each filtering chamber is divided into two compartments by means of an intermediate disk- 50 shaped member, 'both ends of which arealsb designed as filtering surfaces. It is the piilpose and object of' this invention to provide a-multicompartment press of such construction.

In order more clearlyto understand the inven- 55 tion reference is made to the accompanying drawings which illustrate diagrammatically, and byway of example, an embodiment of a doubleacting filter press in accordance therewith and in which:

.Flgure 1 is a longitudinal section with parts 5 broken away.

Figure 2 is a front elevation.

Figure 3 is a longitudinal partial section illustrating the press with. the filtering chambers open.

Figure 4 is a longitudinal section, illustrating the positions of the moving parts at the end of the filtering operation, and

Figure 5 is a longitudinal partial section of a modification of the press.

on the drawings:

Reference numeral i designates the base or the press. The press is supplied at its opposite ends with heads ll rigidly secured to the base. Tie rods t (shown broken away in Figure l) unite til the press heads.

Centrally located in the press is the hydraulic press cylinder t, in which there operate oppositely moving rams ll. Port t provides for sup ply and exhausting the working fluid for the press cylinder.

Supported from and located above cylinder t is a smaller hydraulic cylinder ll. Cylinder it houses pistons t provided with connecting rods t. Pistons t are moved on their outstrolre by Bill fluid admitted through port it, and on their lnstroke by fluid admitted through port l l. Each pnrtis provided with conventional valve means (not disclosed). It will be appreciated that port it exhausts the working fluid, while working fluid is being supplied through port ill and vice versa.

Situated directly below cylinder 4 is another small hydraulic cylinder H which houses pistons l3. 'Pistons l3 are provided with connecting rods l. Ports l4 and I5, functioning in the 40 same may as ports in and II of cylinder 1, are provided in cylinder l2. For reasons which will be subsequently understood, the effective surface of pistons i3 is less than the effective surface oiplstcns8.

Each ram 5 has an extension I! at its outer end. A rim or abutment I8 is provided at the inner end of each extension.

Each head I of the press is provided with an extension I! facing a ram extension l1. The 50 ram and head extensions have the same circumference.

An intermediate member. is movably located between each ram and head. Each intermediate member is constructed with an enlarged central portion 2| and outer portions 22 and 22a facing a ram extension I! and a head extension I! respectively. The circumference of the outer portions of each intermediate member is the same as that of the ram and head extensions. It will be appreciated that the construction so far described locates at each end of the press two filtering chambers I and ,II respectively, chamber I being formed between a ram extension and an intermediate member, and chamber II between a head extension and in intermediate member.

The periphery of the so located filtering chambers is closed by collars 23 and 25, each collar 23 being movable on the ram extension and an outer portion 22 of an intermediate member, and each collar 25 being movable on a head extension and an outer portion 22a of an intermediate member. Each collar 23 is directly connected to a connecting rod 3 by element 24. The movement of a piston 8 is therefore directly transmitted to a collar 23. On the other hand each collar 25 is directly connected to a connecting rod l3 by fastening means 25a. Here again the motion of a piston I3 is directly translated to a collar 25a.

There are provided near the lower end of the press guide rods 26. The rams, collars and intermediate members have carriages 21 fastened thereto, said carriages being slidable on said rods 26. Said rams, collars and intermediate members are accordingly supported and guided in their movement by said rods 26.

The face of each ram extension, of each outer portion of an intermediate memberand of each head extension is provided with a filtering screen 28. Filtrate produced during the filtering action is discharged through ram extensions I! by outlets 29, through intermediate members 28, by outlets 29a, and through heads l3 by outlets 29b.

Each head 2 is centrally apertured at 30 to provide a passage for feeding fluid to filtering chamber II. On the other hand, each intermediate member is centrally apertured at 3| to provide means for egress of fluid from filtering chamber 11 to filtering chamber I. Fluid is supplied to P ssages 30 by inlets 32.

The supply of the medium to be filtered is controlled by the hydraulically operated controls 38a.

Each control comprises a hydraulic cylinder 35 in which a piston 36 operates. 31 and 38 represent hydraulic fluid inlets and outlets for the cylinder.

Piston 36 has a connecting rod 34 which extends I through passage 30 and has attached to its other end an ordinary piston valve 33. Valve 33 is seated in the aperture 33a, leading to filterin chamber II. When pressure is exerted on piston 38 by fluid admitted through port 31, valve 33 is unseated, whereupon the medium to be filtered feeds from passage 30 to chamber II'and by way of passage 3| to chamber I. Subsequently when pressure is exerted on the piston by hydraulic fluid admitted through port 38, valve 33 is again seated in aperture 33a.

Considering only one end of the press for the sake of simplicity, the operation of the press will now be described. Let it be assumed that the press is in the position shown in Figure 3, with ram 5 retracted into the press cylinder 3, collar 23 drawn over ram extension l1 and into engagement with rim I8, collar 25 resting on extension IQ of head 2 in contact with the abutting wall thereof, and intermediate member 28 positioned midway between extension IQ of head 2 and extension II of ram 5. In this position both filter-' ing chambers I and II are freely accessible. It will be understood that at this point piston 8 is at the end of its instroke, and piston |3 at the end of its outstroke. Port IU of cylinder 1 is now opened for fiuid supply and port II for fluid discharge. Piston 8 is thereby caused to move toward the head causing collar 23 to move in that direction until it slides over the outer portion 22 of the intermediate member and contacts with the enlarged central portion 2| of said interme the motion imparted by piston 8 is possible be- 20 cause of the larger effective surface of piston 8. During the further movement of piston 8, ram 5 is operatedin the samev direction. The press parts will thus have assumed the position shown in Figure 1, with filtering chambers I and II clearly defined. When this position has been attained, control 38a is operated to permit the medium to be filtered to feed through inlet 32, passage 30 and aperture 33a, into filtering chamber II, andthrough aperture 3| into filterin chamber I. Control 38a is shut oil when the filtering chambers are filled. Hydraulic fluid is then fed to press cylinder 4 to operate ram 5 which moves the assembled parts to the right as a unit, causing compression of the material in the filtering chambers. The filtrate produced issues i through the outlets 29, 29a and 2912. At this point the parts are in the position clearly illustrated in Figure 4. a When filtration is completed, the opening of the press is inauguratel by releasing the pressure on ram 5. Fluid is supplied through port l5 of cylinder l2, to further retract piston l3 and efiect retrograde movement of collar 25, and thus also of intermediate member 20, collar 23 and ram 5. Piston 8 is then retracted by admission of fluid through port whereby collar 23 is moved out of engagement; with the central portion 2| of intermediate member 28 and over extension ll of the ram, while contact is effected between the collar and rim |8 of the ram extension. At the same time the movement of piston I3 is reversed so as to move collar 25 over the extension IQ of head 2 into engagement with the abutting wall of said head. Further retraction of collar 23 through retraction of piston 8 causes the ram to move further into cylinder 4. As a result of this disposition of the collars and ram, both press cakes are freely accessible and can be removed. The press has then returned to its initial position as illustrated in Figure 3.

It is to be understood that the mode of operation herein outlined is purely illustrative, since because of the structure possessed by the press, it' is possible to open and close the press by a different sequence of steps than that described. Thus, for instance, in closing the press instead of first positively actuating piston 8 and collar 23 to the position of Figure 1, ram 5 may be first op- 70 'be operated simultaneously; As a further alternative instead of 'first retracting piston 3 and 75 till ' ltis retractedln moving collar 25 then retracting piston 8, piston v8 may be first retracted to engage with rim l8, and then further moved to retract the ram and expose the illter cake in chamber I for removal. Therealter, piston I! may be retracted so as to disensaae member'20 from the filter cake in chamber ll, whereupon'by reversing the movement of piston it, so as to push collar 25 over extension l8 and into engagement with the abutting wall of the head, the fllter cake in chamber II is freely exposed for removal.

Figure 5 illustrates a modified form of the invention. In this modification in lieu of cylinder it, two cylinders lza are provided, each located adjacent a head and in alignment with cylinder l. It will be apparent that in this modification the operation will he the same as that described,

ercept that the movements of piston l3a will be reversed. Thus to position collar 25 so as to form filteringcha-mber II, piston i'3a is moved forward instead oi! retracted. The same is true in moving intermediate member 20 to disenga e it llrom the filter cake. 0n the other hand, piston over the head extension to open the press.

it will be apparent that the construction of the filter press according to the present invention allows of a variety oi! modes of operation and the appended claims whiledescribing such operation in eeneral terms are not to be construed as llm-,

ited to any particular mode herein described.

I claim:

i. In a hydraulic press a base, a head to oneend of said base, a hydraulic cylinder disposed inwardly from and co-axial with said head, a ram in said cylinder, press means intermediate said head and hydraulic cylinder consisting of an extension on said head having its taco disposed toward said ram, 9. disk-shaped member having a central portion of greater diameter than said head extension and outer portions of the same diameter as said head extension, a collar located between said head and said disk-shaped member, adapted to slidably and sealingly engage with said head extension and the periphery 5 of the adjacent outer portionof said disk-shaped member and to seaiingly engage with its end face said central portion of said disk-shaped member, a second collar between said ram and said disk-shaped member similar to the first, adapted to slidingly and sealingly engage with said ram and the other outer portion of said disk-shaped member and to sealingly engage with its end face said central portion of said diskshaped member, a second hydraulic cylinder, a

piston in said second cylinder fixedly secured only to said second collar, a third hydraulic cylinder, a piston in said third cylinder fixedly secured only to said other collar, filters mounted on both faces oi said disk-shaped-member and 2 on the face of the extension of said head and of said ram, respectively, so as to form in conjunction with the head extension, said collars, said disk-shaped member and said ram, filtering chambers, means ior the entry of a primary fluid to said chambers and other means to permit exit 01' a secondary'fluid therefrom, the aforesaid elements being adapted to operate in such a manner that in forming and opening said filtering chambers movement of said disk-shaped member is exclusively caused by the movements of the pistons directly controlling the movements of said first and second c'ollars. 2. The device defined in claim "1 wherein means are provided for guiding the ram, collars and disk-shaped member when in motion.

3. The device defined in claim 1 wherein the disk-shaped member is provided with an opening which connects the filtering chambers.

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