Filter diaphragm for a horizontal plate and frame-type filter, such as a tower press

Patent metadata

Field	Value
Publication number	US-12434176-B2
Application number	US-202017792850-A
Country	US
Kind code	B2
Filing date	Apr 17, 2020
Priority date	Apr 17, 2020
Publication date	Oct 7, 2025
Grant date	Oct 7, 2025

Abstract

A filter diaphragm for a horizontal plate and frame-type filter, such as a tower press, including a sheet like body and at least on a filter plate-facing side thereof, a continuous seal bead. The seal bead includes an inner seal lip on a lateral inside of the seal bead and an outer seal lip surrounding the inner seal lip on a lateral outside of the seal bead. The outer seal lip is elevated from the inner seal lip in a vertical direction perpendicular to a general plane defined by the diaphragm.

First claim

The invention claimed is:

1. A filter diaphragm for a horizontal plate and frame-type filter including a filter plate and a plate frame, comprising:
a sheet like body having a flexible structure, the body having a filter plate-facing side and a plate frame-facing side opposite the filter plate-facing side;
a continuous seal bead on the filter plate-facing side of the body; and
an attachment bead on a plate frame-facing side of the body, opposite to the filter plate-facing side, the attachment bead for attaching the diaphragm to a correspondingly shaped groove formed on the plate frame,
wherein the seal bead delimits a planar central portion of the diaphragm on a lateral inside thereof, a lateral outside of the diaphragm being defined on a side of the seal bead opposite to the lateral inside,
wherein the seal bead comprises an inner seal lip on a lateral inside of the seal bead and an outer seal lip surrounding the inner seal lip on a lateral outside of the seal bead, wherein the inner seal lip and the outer seal lip are configured to engage the filter plate,
wherein the outer seal lip is elevated from the inner seal lip in a vertical direction perpendicular to a general plane defined by the diaphragm.

2. The filter diaphragm according to claim 1 , wherein the outer seal lip is configured to deform outwardly away from the filter plate-facing side when a pressure is exerted thereon from a lateral outside, and to deform inwardly towards the filter plate-facing side, when a pressure is exerted thereon from a lateral inside, and
wherein the inner seal lip is configured to deform outwardly away from the filter plate-facing side when a pressure is exerted thereon from a lateral inside, and to deform inwardly towards the filter plate-facing side, when a pressure is exerted thereon from a lateral outside.

3. The filter diaphragm according to claim 1 , wherein, the outer seal lip has a first asymmetric lateral rigidity, and the inner seal leap has a second asymmetric lateral rigidity,
wherein the inner seal lip has an increased lateral rigidity against a pressure exerted from the lateral inside with respect to a transversal rigidity of the inner seal lip against a pressure exerted from the lateral outside, and
wherein the outer seal lip has an increased lateral rigidity against a pressure exerted from a lateral outside with respect to a transversal rigidity of the outer seal lip against a pressure exerted from a lateral inside.

4. The filter diaphragm according to claim 1 , wherein a cross-sectional profile of the outer seal lip defines an outer seal lip ridge extending past and between an outside crest and an intermediate crest, and a cross-sectional profile of the inner seal lip defines an inner seal lip ridge extending past and between an inside crest and the intermediate crest.

5. The filter diaphragm according to claim 4 , wherein a portion of the cross-sectional profile of the inner seal lip, residing on a lateral outside of a vertical line running through a lateral center point of the inner seal lip ridge along the direction perpendicular to the general plane of the diaphragm, occupies a greater space than a portion of the cross-sectional profile of the inner seal lip residing on a lateral inside of said line, and
in that a portion of the cross-sectional profile of the outer seal lip, residing on a lateral inside of a vertical line running through a lateral center point of the outer seal lip ridge along the direction perpendicular to the general plane of the diaphragm, occupies a greater space than a portion of the outer seal lip residing on a lateral outside of said line.

6. The filter diaphragm according to claim 4 , wherein the cross-sectional profile of the outer seal lip has a greater inclination between the outside crest and the outer seal lip ridge than between the intermediate crest and the outer seal lip ridge, and
in that the cross-sectional profile of the inner seal lip has a greater inclination between the inside crest and the inner seal lip ridge than between the intermediate crest and the inner seal lip ridge.

7. The filter diaphragm according to claim 4 , wherein an inclination at which a lateral outside wall of the outer seal lip adjoins the outer seal lip ridge is greater than an inclination at which a lateral inside wall of the outer seal lip adjoins the outer seal lip ridge, and
in that an inclination at which a lateral inside wall of the inner seal lip adjoins the inner seal lip ridge is greater than an inclination at which a lateral outside wall of the inner seal lip adjoins the inner seal lip ridge.

8. The filter diaphragm according to claim 4 , wherein the outer seal lip has a first height extending from the intermediate crest outwardly from the filter plate-facing side of the diaphragm in the direction perpendicular to the general plane of the diaphragm, and the inner seal lip has a second height extending from the intermediate crest outwardly from the filter plate-facing side of the diaphragm in the direction perpendicular to the general plane of the diaphragm, and
wherein the first height is at least 10% greater than the second height.

9. The filter diaphragm according to claim 4 , wherein the outer seal lip has a first height extending from the intermediate crest outwardly from the filter plate-facing side of the diaphragm in the direction perpendicular to the general plane of the diaphragm, and the inner seal lip has a second height extending from the intermediate crest outwardly from the filter plate-facing side of the diaphragm in the direction perpendicular to the general plane of the diaphragm, and
wherein the second height is at least 30% of the first height.

10. The filter diaphragm according to claim 1 , wherein the attachment bead runs along the periphery of the filter diaphragm and delimits the central portion of the diaphragm on an lateral inside of the attachment bead,
wherein the attachment bead has a cross-sectional profile having base portion attaching the attachment bead to the remaining diaphragm, a distal portion and an intermediate portion between the base portion and the distal portion, such that a laterally extending dimension of the distal portion exceeds that of the intermediate portion,
wherein the attachment bead has an asymmetric cross-sectional profile with respect to a vertical asymmetry axis running through a lateral center point of a minimum width section of the intermediate portion,
wherein the vertical asymmetry axis is perpendicular to a general plane of the diaphragm, defined by a planarity of the central portion, when laid on a flat surface,
wherein the minimum width section of the intermediate portion being defined as a point of the cross-sectional profile of the attachment bead at which the intermediate portion exhibits a smallest laterally extending dimension, and
wherein the distal portion extends laterally further from the asymmetry axis on the lateral outside than on the lateral inside.

11. The filter diaphragm according to claim 10 , wherein the cross-sectional profile of the attachment bead is asymmetric at the intermediate portion with respect to the vertical asymmetry axis.

12. The filter diaphragm according to claim 11 , wherein an asymmetric concavity, with respect to the asymmetry axis, is provided on the intermediate portion of the cross-sectional profile of the attachment bead.

13. The filter diaphragm according to claim 10 , wherein the cross-sectional profile of the attachment bead is asymmetric at the distal portion with respect to any vertical line running through the attachment bead.

14. The filter diaphragm according to claim 10 , wherein an

Assignees

• Metso Outotec Finland Oy
• Metso Finland Oy

Inventors

• Mustakangas Mirva
• Juvonen Ismo
• Kaipainen Janne
• Eloranta Teemu
• Illi Mika
• Vänttinen Kari

Classifications

• B01D2201/34

  Seals or gaskets for filtering elements · CPC title

• B01D35/14

  Safety devices specially adapted for filtration (preventing or minimising fires or explosions A62C); Devices for indicating clogging (incorporated in a throw-away filter B01D27/10) · CPC title

• B01D25/215

  Construction of the filter plates, frames · CPC title

• B01D25/164

  Chamber-plate presses, i.e. the sides of the filtering elements being clamped between two successive filtering plates (B01D25/127, B01D25/172, B01D25/176, B01D25/19 take precedence) · CPC title

• B01D25/285 Primary

  by compression using inflatable membranes · CPC title