DE3507063C1

DE3507063C1 - Pressing wall for filter elements of a filter press

Info

Publication number: DE3507063C1
Application number: DE3507063A
Authority: DE
Inventors: Franz Heckl; Werner Dipl.-Ing. 7901 Illerkirchberg Junker; Horst Dipl.-Ing. Opitz (FH), 7913 Senden
Original assignee: LENSER KUNSTSTOFF PRESS
Current assignee: LENSER KUNSTSTOFF PRESS
Priority date: 1985-02-28
Filing date: 1985-02-28
Publication date: 1986-05-15

Abstract

The pressing wall has an edge region (1), making its connection to the filter element, and a wall strip (3), which runs along this edge region and which can be bent at least to the extent of the pressing stroke of the pressing wall, and profile projections (4, 5, 6) covered by a filter cloth on the respective wall surface facing the filter chamber. The profile projections located in the bendable wall strip (3) are configured as profile ridges (4) having a length at least twice the width in plan view and arranged in a plurality of rows running parallel to the edge (1') of the pressing wall, the profile ridges (4) following one after the other in each row, having longitudinal axes (4') running in the direction of the row and being aligned with each other, and leaving gaps (8) between themselves for the passage of filtrate, and the profile ridges (4) of adjacent rows forming between these rows continuous bending channels (9) for the pressing wall, parallel to the pressing wall edge (1') in the direction of the row. <IMAGE>

Description

Diese Aufgabe wird nach der Erfindung dadurch gelöst, daß die im verbiegbaren Wandstreifen befindlichen Profilvorsprünge als Profilstege von im Grundriß nahezu doppelter oder noch größerer Länge als Breite ausgebildet und in mehreren parallel zum Rand der Preßwand verlaufenden Reihen angeordnet sind, wobei die Profilstege in jeder Reihe mit in Reihungsrichtung ver- laufenden und miteinander fluchtenden Längsachsen aufeinander folgen und zwischen sich Lücken für den Filtratdurchtritt freilassen, und wobei die Profilstege ne beneinander liegender Reihen zwischen sich in Reihungsrichtung parallel zum Preßwandrand durchlaufende Biegerillen für die Preßwand bilden. This object is achieved according to the invention in that the im bendable wall strips located profile projections as profile webs in plan formed almost twice or even greater length than width and in several Rows running parallel to the edge of the press wall are arranged, the profile webs in each row with running and with each other aligned longitudinal axes follow one another and there are gaps between them for the filtrate to pass through leave blank, and the profile webs ne adjacent rows between them in the row direction parallel to the press wall edge continuous bending grooves for the Form press wall.

Die länglichen, in den Reihen jeweils fluchtenden Profilstege schaffen durch die von ihnen zwischen benachbarten Reihen gebildeten durchlaufenden Biegerillen klare Biegezonen für die Preßwand und durch ihre zum Rand der Preßwand parallele, gereihte Anordnung ein regelmäßiges Muster für den guten Ablauf des Filtrats. Create the elongated profile webs that are aligned in the rows through the continuous bending grooves formed by them between adjacent rows clear bending zones for the press wall and due to their parallel to the edge of the press wall, Lined up a regular pattern for the filtrate to run off properly.

Insbes. können dabei, um möglichst breite Profile für die Biegerillen zu erhalten, die Profilstege im Grundriß schmaler sein als der Durchmesser kreisförmiger Profilvorsprünge, die in dem vom verbiegbaren Wandstreifen umschlossenen Innenbereich der Preßwand vorgesehen sind, ohne daß dabei die zur Abstützung des Filtertuches erforderliche Mindestauflagefläche unterschritten würde. Dabei kann sogar die Breite der Biegerillen etwas geringer sein als der unmittelbare Abstand zwischen den im Grundriß kreisförmigen Profilvorsprüngen. Die Biegezonen der Preßwand sind durch die Biegerillen festgelegt, unabhängig von Zufälligkeiten und Ungleichmäßigkeiten im Filterkuchenaufbau. Um im übrigen die durch die Biegerillen ermöglichte leichte Verformungsmöglichkeit des Randstreifens der Preßwand in definierter Weise hauptsächlich auf den Bereich dieses Wandstreifens zu beschränken, kann es sich empfehlen, die auf die innere Profilstegreihe zur Plattenmitte hin nächstfolgenden Profilvorsprünge mindestens zum Teil ebenfalls als Profilstege mit jedoch im wesentlichen quer zum Preßwandrand verlaufender Längsachse auszubilden. Diese letzteren Profilstege versteifen dann die Preßwand im Bereich innerhalb des die Biegerillen aufweisenden Wandstreifens quer zur Richtung der Biegerillen, so daß die den Preßhub ermöglichende hauptsächliche Verformung der Preßwand auf diesen Wandstreifen beschränkt ist. Schließlich besteht die Möglichkeit, die Profilstege benachbarter Reihen auf Lücke anzuordnen, um dadurch den Randstreifen in Reihungsrichtung gegen Biegung zu versteifen und in dieser Richtung Unterschiede im Biegeverhalten aufgrund ungleichmäßigen Filterkuchenaufbaus nach Möglichkeit zu vermeiden.Esp. can do this to create the widest possible profiles for the bending grooves To get the profile webs in plan to be narrower than the circular diameter Profile projections in the inner area enclosed by the bendable wall strip the press wall are provided without the need to support the filter cloth required minimum contact area would be undershot. You can even choose the width of the bending grooves must be slightly smaller than the immediate distance between the im Plan of circular profile projections. The bending zones of the press wall are through the bending grooves are determined regardless of randomness and irregularities in the filter cake structure. In addition to the light weight made possible by the bending grooves Mainly the possibility of deformation of the edge strip of the press wall in a defined manner To limit the area of this wall strip, it may be advisable to use the the next following profile projections on the inner row of profile webs towards the center of the panel at least in part also as profile webs with, however, essentially transverse to Form press wall edge extending longitudinal axis. These latter profile webs stiffen then the press wall in the area within the wall strip having the bending grooves transversely to the direction of the bending grooves, so that the main one that enables the pressing stroke Deformation of the press wall is limited to this wall strip. Finally there is the possibility of arranging the profile webs of adjacent rows in a gap in order to thereby to stiffen the edge strip against bending in the row direction and in this direction Differences in bending behavior due to uneven filter cake build-up Possibility to avoid.

Im folgenden wird die Erfindung an einem in der Zeichnung dargestellten Ausführungsbeispiel näher erläutert; es zeigt F i g. l einen Ausschnitt aus einer Preßwand nach der Erfindung in Draufsicht, F i g. 2 einen Schnitt in Richtung Il-II durch die Preßwand nach Fig. 1. In the following the invention is illustrated in the drawing Embodiment explained in more detail; it shows F i g. l an excerpt from a Press wall according to the invention in plan view, F i g. 2 shows a section in the direction II-II through the press wall according to FIG. 1.

Die in der Zeichnung dargestellte Preßwand für plattenförmige Filterelemente einer Filterpresse besitzt einen ihren Anschluß an das Filterelement vermittelnden, gegen das Filterelement abdichtbaren Randbereich 1 und einen entlang diesem Randbereich 1 verlaufenden und hauptsächlich den in Richtung des Doppelpfeils 2 stattfindenden Preßhub der Preßwand ermöglichenden und dazu verbiegbaren Wandstreifen, der in der Zeichnung hinsichtlich seiner Breite durch die Bezugsziffer 3 bezeichnet ist. Die im zusammengebauten Zustand der Filterpresse der Filterkammer zugekehrte Wandfläche der Preßwand ist mit Profilvorsprüngen 4,5,6 versehen, die ein nicht dargestelltes Filtertuch tragen. Diese Profilvorsprünge 4, 5, 6 bilden zwischen sich unter dem Filtertuch ein an einen Auslauf im Filterelement angeschlossenes Rinnensystem für das aus der Filterkammer durch das Filtertuch hindurchtretende Filtrat. Die in dem vom verbiegbaren Wandstreifen 3 umschlossenen Innenbereich 7 der Preßwand befindlichen Profilvorsprünge 6 besitzen im Grundriß etwa kreisförmige Gestalt. Die im verbiegbaren Wandstreifen 3 befindlichen Vorsprünge 4 sind als Profilstege von im Grundriß mindestens doppelter Länge als Breite ausgebildet. Sie sind in drei parallel zum Rand 1' der Preßwand verlaufenden Reihen angeordnet. Die Profilstege 4 in jeder Reihe folgen mit in Reihungsrichtung verlaufenden und miteinander fluchtenden Längsachsen 4' aufeinander und lassen zwischen sich Lücken 8 für den Filtratdurchtritt frei. Die Profilstege 4 nebeneinander liegender Reihen bilden zwischen sich in Reihungsrichtung parallel zum Preßwandrand 1' durchlaufende Biegerillen 9 für die Preßwand. Die Profilstege 4 sind im Grundriß schmaler als der Durchmesser der kreisförmigen Profilvorsprünge 6. Dennoch ist die von diesen Profilvorsprüngen 6 gebildete, auf eine spezifische Flächengröße der Preßwand bezogene Auflagefläche für das nicht dargestellte Filtertuch keineswegs größer als die entsprechende Auflagefläche, die von den Längsstegen 4 im verbiegbaren Wandstreifen 3 der Preßwand gebildet ist. Dabei ist im Ausführungsbeispiel die Breite der Biegerillen 9 geringer als der unmittelbare, d. h. längs der jeweils die Mittelpunkte verbindenden Geraden gemessene Abstand zwischen den im Grundriß kreisförmigen Profilvorsprüngen 6. Dennoch können diese Profilvorsprünge 6 zwischen sich keine den Biegerillen 9 vergleichbaren Schwächungszonen der Preßwand bilden, weil diese kreisförmigen Profilvorsprünge 6 so gegeneinander versetzt sind, daß sie zwischen sich keine gerade durchlaufenden Profilrillen vergleichbarer Breite wie die Biegerillen 9 bilden. Im übrigen sind einige auf die innere Profilstegreihe zur Wandmitte hin nächstfolgenden Profilvorsprünge 5 ebenfalls in Form von Profilstegen ausgebildet, wobei jedoch diese Profilstege 5 mit im wesentlichen quer zum Preßwandrand 1' verlaufender Längsachse 5' ausgebildet sind, so daß sie eine Biegeversteifung der Preßwand quer zu den Biegerillen 9 schaffen und dadurch die den Preßhub ermöglichende Verformung der Preßwand hauptsächlich auf den die Biegerillen 9 aufweisenden Wandstreifen 3 beschränken. Im übrigen können die Profilstege 4 benachbarter Reihen auf Lücke angeordnet sein, wie es im Ausführungsbeispiel in dem mit 10 bezeichneten Bereich des Wandstreifens 3 dargestellt ist. Dadurch wird eine Biegeversteifung der Preßwand in Längsrichtung der Biegerillen 9 erreicht, so daß in dieser Richtung das Biegeverhalten des Wandstreifens 3 nicht durch Zufälligkeiten im Filterkuchenaufbau beeinflußt werden kann. The press wall shown in the drawing for plate-shaped filter elements a filter press has a connection to the filter element, against the filter element sealable edge area 1 and along this edge area 1 and mainly those taking place in the direction of the double arrow 2 Pressing stroke of the press wall enabling and bendable wall strips in the Drawing is denoted by the reference number 3 with regard to its width. the Wall surface facing the filter chamber in the assembled state of the filter press the press wall is provided with profile projections 4,5,6, which are not shown Wear filter cloth. These profile projections 4, 5, 6 form between them under the Filter cloth a channel system connected to an outlet in the filter element for the filtrate passing through the filter cloth from the filter chamber. The in that located by the bendable wall strip 3 enclosed inner region 7 of the press wall Profile projections 6 have an approximately circular shape in plan. The in the bendable Wall strips 3 located projections 4 are as profile webs of at least in plan formed twice the length than the width. They are in three parallel to the edge 1 'of the Press wall running rows arranged. The profile webs 4 follow in each row with longitudinal axes 4 'running in the direction of the row and aligned with one another one on top of the other and leave gaps 8 between them for the filtrate to pass through. the Profile webs 4 adjacent rows form between them in the direction of the row parallel to the press wall edge 1 'continuous bending grooves 9 for the press wall. The profile webs 4 are narrower in plan than the diameter of the circular profile projections 6. Nevertheless, the one formed by these profile projections 6 is specific Area size of the press wall-related support surface for the filter cloth, not shown in no way larger than the corresponding contact surface that is supported by the longitudinal webs 4 is formed in the bendable wall strip 3 of the press wall. It is in the exemplary embodiment the width of the bending grooves 9 is less than the immediate, d. H. along each Distance between the straight lines connecting the center points measured in the plan circular profile projections 6. Nevertheless, these profile projections 6 between no weakening zones of the press wall comparable to the bending grooves 9 are formed, because these circular profile projections 6 are offset from one another that between them there are no straight tread grooves of comparable width how the bending grooves 9 form. In addition, some are on the inner row of profile webs profile projections 5 next to the center of the wall, likewise in the form of profile webs formed, but these profile webs 5 with essentially transverse to the edge of the press wall 1 'extending longitudinal axis 5' are formed so that they have a bending stiffener create the pressing wall transversely to the bending grooves 9 and thereby the pressing stroke enabling Deformation of the press wall mainly on the wall strip having the bending grooves 9 3 limit. In addition, the profile webs 4 adjacent rows can be gap be arranged, as in the exemplary embodiment in the area designated by 10 of the wall strip 3 is shown. This creates a flexural stiffening of the press wall reached in the longitudinal direction of the bending grooves 9, so that the bending behavior in this direction of the wall strip 3 is not influenced by accidents in the filter cake structure can be.

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Claims

Claims: 1. Press wall for filter elements of a filter press, in which several filter elements clamped together at the edge are filter chambers between them with inlets opening into them for the suspension to be filtered and or tightly connected to the edge of the filter element on both sides, otherwise through a pressure medium in the filter chamber carry forward movable pressure walls on their the respective filter chamber facing wall surface covered with a filter cloth have, which under the filter cloth a channel system connected to an outlet form for the filtrate, wherein the press wall one of its connection to the filter element mediating edge area (1) and one running along this edge area and at least in the circumference of the pressing stroke of the pressing wall bendable wall strips (3) has, d a -characterized in that the bendable wall strips (3) are located Profile projections as profile webs (4) of almost double or even more in plan greater length than width and formed in several parallel to the edge (1 ') of the Press wall running rows are arranged, the profile webs (4) in each Row with longitudinal axes running in the direction of the row and aligned with one another (4 ') follow one another and leave gaps (8) between them for the filtrate to pass through, and wherein the profile webs (4) of adjacent rows between them in the direction of the row Form continuous bending grooves (9) for the press wall parallel to the press wall edge (1 ').

2. Press wall according to claim 1, characterized in that the profile webs (4) are narrower in plan than the diameter of circular profile projections (6) in the inner area (7) enclosed by the bendable wall strip (3) the press wall are provided.

3. Press wall according to claim 1 or 2, characterized in that the the next following profile projections on the inner row of profile webs towards the center of the panel at least in part also as profile webs (5) with, however, essentially transversely to the press wall edge (1 ') extending longitudinal axis (5') are formed.

4. Press wall according to claim 2, characterized in that the width the bending grooves (9) is less than the immediate distance between the in plan circular profile projections (6).

5. Press wall according to one of claims 1 to 4, characterized in that that the profile webs (4) of adjacent rows are arranged in a gap.

The invention relates to a press wall for filter elements of a filter press, in which several filter elements clamped together at the edge are filter chambers between them with inlets opening into them for the suspension to be filtered and or tightly connected to the edge of the filter element on both sides, otherwise through a pressure medium in the filter chamber carry forward movable pressure walls on their covered the wall surface facing the respective filter chamber with a filter cloth Have profile projections which are connected to an outlet under the filter cloth Form a channel system for the filtrate, with the pressure wall connected to it the edge area mediating the filter element and one along this edge area extending and at least in the circumference of the pressing stroke of the pressing wall bendable wall strips having.

Press walls for filter elements of filter presses of this type are for example known from DE-OS 32 20487 and have profile projections over the entire Press wall surface, that is, both in the bendable one that mainly enables the press stroke Wall strips as well as in the inner wall area enclosed by them in the plan circular shape and in rows next to each other as well as in each other adjacent rows are arranged on gaps.

The diameter and spacing of these profile projections are so on top of one another coordinated that a minimum support surface is available for the filter cloth, which the filter cloth needs to withstand the filter pressure without damage can. An arrangement of the profile projections has proven to be particularly favorable shown in which the centers of three adjacent profile projections form the corners of an equilateral triangle. The rows in which the profile protrusions are arranged, usually run diagonally to the edges of the press wall. Therefore it is by no means always possible to arrange the profile projections with a constant Continue division up to the immediate edge areas of the press wall, as between the direction of alignment and the directions of the edge course of the press wall regularly there is no parallelism and the division dimension is only in exceptional cases as an integer Multiple is contained in the series. As a result, the profile projections form especially in the wall strip arrangement pattern that enables the bending of the press wall, which complicate the outflow of the filtrate due to their unevenness and irregularity and adversely affect the deformation pattern of the bendable wall strip, so that, despite all the randomnesses in the structure of the filter cake, it is sufficiently uniform Bending behavior of the press wall everywhere along its edge not or at most only can come about very inadequately.

From US-PS 44 35 288 a press wall is known, the profile projections Ribs are arranged in the corners of the press wall on an arc of a circle are that in each case one of these ribs runs parallel to the edge of the press wall, while otherwise the ribs in the edge area form a right angle to the edge.

From US-PS 33 90 772 a circular press wall is known which forms circular ribs so that the ribs are concentric to the plate edge.

The invention is based on the object of a press wall of the opening called type so that you can mainly bend the pressing stroke Edge stripes a well-defined, independent of all coincidences in the structure of the filter cake Has bending behavior and thus uniform bending stresses everywhere in the edge strip the press wall and a uniform filtrate flow can be obtained.