CA1073367A - Filter plate for a plate type filter press - Google Patents

Filter plate for a plate type filter press

Info

Publication number
CA1073367A
CA1073367A CA255,921A CA255921A CA1073367A CA 1073367 A CA1073367 A CA 1073367A CA 255921 A CA255921 A CA 255921A CA 1073367 A CA1073367 A CA 1073367A
Authority
CA
Canada
Prior art keywords
filter
plate
cam
filter plate
cloth
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
CA255,921A
Other languages
French (fr)
Inventor
Oswald Busse
Hugo Klesper
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Aqseptence Group GmbH
Original Assignee
Passavant Werke Michelbacher Hutte
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Passavant Werke Michelbacher Hutte filed Critical Passavant Werke Michelbacher Hutte
Priority to CA255,921A priority Critical patent/CA1073367A/en
Application granted granted Critical
Publication of CA1073367A publication Critical patent/CA1073367A/en
Expired legal-status Critical Current

Links

Abstract

FILTER PLATE FOR A PLATE TYPE FILTER PRESS

Abstract of the Disclosure A filter plate having a plate frame with filtrate discharge means covered by filter cloth adjacent the bottom of a filter cake chamber defined by recesses in the plate. A cam projects from the bottom of the filter cake chamber and is adapted to support the filter plate on a corresponding cam on an adjacent filter plate with the cam extending substantially to the level of the outer surface of the frame of the filter plate. An opening is provided in the filter cloth covering the plate frame for receiving the cam. A clamping ring surrounds the cam and the filter cloth adjacent thereto to form a seal there-between. A washer-like member overlies the cam and a portion of the clamping ring and retains the clamping ring in place.

Description

i, lS Background of the Invention ' . j~
- ~ This inven~ion relates to a filter plate for a pla~e type filter press, which is particularly adapted for use in the dewatering of sewage sludges.
As is well known, any number oi- such filter plates can be slidably attached side by side tc~ the usual horizontal , guide means of the filter press frame. The filter plates are -~1 provided with suitable filtrate discharge ports or the like and are co~ered on both sides by filter cloth which is dis-posed at the bottom of the cake chambers formed by recesses ~ , . . .
in the filter plates. When the filter press is ready~for . . .
operation, the ~ilter plates are moved from their spaced apart locations and pushed c}osely together and hydraulically pressed against each other. The suspension to be dewatered . ~
is then introduced into the filter chambers. The solids remain on the filter media forming filter cakes thereon, . .
~ whereas the ~iltrate passes through the cloth and then thxough ' ~ .
-1 the usual discha~ge portR in the plates whereupon it will be , ,. , ! ~ ' ~

. .... , --1--: , ~ ': '' ' ',: ', ' ,'"' ' ~' ' ' " ' ~ ,, :

, , ' .

' '". ~'~ , '.

1~733G7 disposed of as desired.
In view o the large size of conventional filter plates used at the present, it is necessary to support the filter plates on each other by at least one staying means in addition to the filter plate supporting frame, with such staying means being provided inside the cake chamber. This is very desirable in view of possible pressure difference building up on either side of a filter plate during introduction o the suspension which results in high bending stresses.
la In conventional appratus cams have been employed to overcome this disadvantage with such cams extending from the chamber essen~ially out to the plate frame. However, problems are encountered with such cams due to the fact that the filter cloth covers the entire surface of the plate and is secured at its edges.
One attempt to solve this problem was to place the filter cloth over the cam. However, it was found that the cloth was under too much ten~sion at the junction of the cam and filter chamber so as to become unusable after a short period of use.
Later, by way of improvement, such cams were not formed integrally with the filter plate but were fastened thereto by screw means with the filter cloth being inserted and fastened between the plate and the cam. But even this attempt to solve the problem had a serious drawback due to the con-struction of the pla~e. The surface against which the cam abuts could not be manufactured and finished with the frame in a single operation. Also, as the filter cloth is later interposed between two metal surfaces its final thickness under compression, cannot be predetermined accurately~
Accordingly, considerable differences in height resulted 73~
. ~ i :¦ between tha outer surface of the cam and the outer surface of the filter cloth near the plate frame with such differences interfering with the ~upport of the plates upon one another.
In addition to these attempts to solve the above mentioned problem the filter cloth has been provided with a ~ cutout for the cam, with the edge of this cutout being -- sealingly retained by means of a clamping ring. Such a conventional design is shown in the German design patent No.
1,967,244 wherein an O-ring used for this purpose is fitted 10: in a groove at the bottcm o~ the cam. But even this attempt was not satisfactory from a constructional point of view.
~ First, it was difficult to cut the groove for the O~-ring and I second, it was still not possible to finish the surface of I the cam and the plate frame in a single operation. Since 1 15 the filter cloth is disposed on the filter frame and not on the cam, the resulting difference in height makes it I difficult to support the plates properly.
I Summary of the Invention I An object of the present invention is to eliminate the above mentioned difficulties by providing means for fastening and sealing the filter cloth adjacent the cams which permits a finishing of the cam surface and the plate frame in one and the same operation. According to our invention this is achieved by retaining a clamping ring in place by means of a washer or the like which extends over the supporting cam.
Such a wacher is easily attached to the cam by simply clamping it in place, since it will be held in place by the pressure of the made-up press, and in addition by the working pressure during filtration. Accordingly, the sealing and clamping effect of the ring will be strengthened during operatio~.
The pressure differential between the plates will no longer , . .,,, , ~ . , . . ~ .

733~;7 be transmitted through the filter cloth to the plate, whereby the service life of the cloth will b~ considerably prolonged.
Thus, in accordance with the present invention there is provided in a filter plate for a plat:e type filter press particularly adapted for use in the dewatering of sewage sludges, the filter plate having a plate frame and having filtrate discharge means covered by filter cloth disposed adjacent the surface of a filter cake chamber which is formed by recesses in the filter plate and which is parallel to an open side of the ~' 10 filter plate, the improvement comprising at least one cam projecting from said surface of said filter cake chamber of one filter plate and adapted to support said one filter plate on a corresponding cam on an adjacent filter plate with said one cam extending substantially to the level of the outer surface of the frame of said one filter plate, including said filter cloth, said filter cloth covering said plate frame and having an opening therein adapted to receive said cam, a clamping ring surrounding said cam and the filter cloth adjacent thereto to provide a seal therebetween, and a washer-like member over-lying said cam and a portion of said clamping ring and retaining said clamping ring in place.
Description of the Drawing A filter plate embodying features of our invention is illustrated in the accompanying drawing, forming a part of this application, in which the single view is a fragmental, vertical sectional view, partly ~rpken away and showing portions of adjacent filter plates.
Detailed Description _ _ _ One embodiment of our invention will now be described more specifically with reference being had to the attached drawing. ~e show abutting filter plates 1 having the usual frames 2 which extend over the entire plate thickness. Each filter plate 1 has recesses 3 in opposite sides thereof with ~,,fb~l~ the bottom of each recess 3 being provided with ~i:Ltrate ~L~g733~i7 .
discharge grooves ~. Filter cloth 5 extends over each of the frames 2 and the grooves ~ and defines a chamber 6 between adjacent frames wherein the filter cake is retained during operation.
A cam 7 is located at one or several places on each filter plate 1 and extends outwardly from the bottom of each recess 3 inside the chamber 6, as shownl with the outer surface 8 of the cam 7 being at substantially the same level as the outer surface of the frame 2. The filter cloth 5 is cut out lQ at the location of each cam 7, as shown.
A clamping ring 9 telescopes over each of the cams 7 and the adjacent portion of the filter cloth 5 to provide a seal between the filter chamber 6 and the grooves 4. The ring 9 is retained in place by means of a washer 10 having an inden-tation 11 adjacent its center to receive the head 12 of a retaining screw 13. The thickness of the washer 10 is so selec-ted that, when the press is ready for operation with the filter cloth 5 clamped in place, the outer surface of the washer 10 is either on the same level with the outer surface of the plate frame 2 including the filter cloth 5 or may be slightly inwardly of the outer surface of the frame 2. In this case it may,be necessary to provide the filter plates with a certain bending margin or tolerance whereby adjacent plates are permitted to bear on each other only when the pressure differential on oppo-site sides of the plate has reached a predetermined level and the plate has been bent a predetermined amount. To accomplish this, we so dimension the washer 10 that its outer surface ex tends in a plane inwardly of the outer surface of the frame 2 ranging from 0.1 to 0.5 mm. That is, the outer surface of the washer 10 is undersize in relation to the cloth covered plate frame 2. The screw 13 may of course be replaced by other sui-table fas-tening means, ~uch as a tightening or retaining pin.
Also, the washer 10 may be circular, as shown, or may be of : ~73367 `;other suitable forms. It is not necessary that the clamping ring 9 and washer 10 be permanently connected to each other, since these parts may be separate`from each other so as to be assembled and disasse~bled one after the other.
The surfacesof the cam 7 and t:he plate frame 2 are easily finished in a single operation where the thi¢kness of the washer 10 is approximately equal to that of the filter cloth 5. In operation, when the plate frames 2 closely abut each other as shown, the cams 7 with their overlying washers 10 will also be in contact with one another, whereby the plates will be supported entireIy one upon the other. Such dimensioning has another advantage in that varying thickness of filter cloth 5 can be easily compensated for by corres-ponding washers 10 of equal thickness, whereas the filter ...

-5a-~L~733~ii7 plate itself remains the same for any desired cloth thickness.
For a quick change of the filter cloth 5 it is advantageous to secure the washer 10 to the cam 7 so that it can be detached easilyO The clamping ring 9 is preferably made of rubber or of a similar elastic materialO
While we have shown our invention :in but one form it will be obvious to those skilled in the art that it is not so limited, but is susceptible of various changes ancl modifications without departing from the spirit thereof.

Claims (5)

THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. In a filter plate for a plate type filter press particularly adapted for use in the dewatering of sewage sludges, the filter plate having a plate frame and having filtrate discharge means covered by filter cloth disposed adjacent the surface of a filter cake chamber which is formed by recesses in the filter plate and which is parallel to an open side of the filter plate, the improvement comprising:
(a) at least one cam projecting from said surface of said filter cake chamber of one filter plate and adapted to support said one filter plate on a corresponding cam on an adjacent filter plate with said one cam extending substantially to the level of the outer surface of the frame of said one filter plate, including said filter cloth, (b) said filter cloth covering said plate frame and having an opening therein adapted to receive said cam, (c) a clamping ring surrounding said cam and the filter cloth adjacent thereto to provide a seal therebetween, and (d) a washer-like member overlying said cam and a portion of said clamping ring and retaining said clamping ring in place.
2. A filter plate as defined in claim 1 in which the thickness of said washer-like member is substantially equal the thickness of said filter cloth.
3. A filter plate as defined in claim 1 in which the outer surface of said washer-like member is located inwardly with respect to the plane of the outer surface of said plate frame covered with cloth a distance ranging from 0.1 to 0.5 mm.
4. A filter plate as defined in claim 1 in which said washer-like member is detachably connected to said cam.
5. A filter plate as defined in claim 1 in which said clamping ring is a rubber-like member.
CA255,921A 1976-06-29 1976-06-29 Filter plate for a plate type filter press Expired CA1073367A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CA255,921A CA1073367A (en) 1976-06-29 1976-06-29 Filter plate for a plate type filter press

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA255,921A CA1073367A (en) 1976-06-29 1976-06-29 Filter plate for a plate type filter press

Publications (1)

Publication Number Publication Date
CA1073367A true CA1073367A (en) 1980-03-11

Family

ID=4106313

Family Applications (1)

Application Number Title Priority Date Filing Date
CA255,921A Expired CA1073367A (en) 1976-06-29 1976-06-29 Filter plate for a plate type filter press

Country Status (1)

Country Link
CA (1) CA1073367A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104743764A (en) * 2015-03-26 2015-07-01 安徽省通源环境节能有限公司 Water guiding and cake discharging device for sludge high-dry dehydration filter press

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104743764A (en) * 2015-03-26 2015-07-01 安徽省通源环境节能有限公司 Water guiding and cake discharging device for sludge high-dry dehydration filter press
CN104743764B (en) * 2015-03-26 2016-05-11 安徽省通源环境节能有限公司 The water guide cake discharge device of sludge high-drying dehydration filter press

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