Filter device

• US 5,922,208 A
• Filed: 03/10/1998
• Issued: 07/13/1999
• Est. Priority Date: 06/08/1995
• Status: Expired due to Term

• Current Assignee: Defil N.V. Holland Intertrust
• Original Assignee: Defil N.V. Holland Intertrust
• Inventors: Demmers, Petrus Adrianus Cornelis Maria
• Primary Examiner(s): Woo, Jay H.
• Assistant Examiner(s): LAWRENCE JR, FRANK M
• Application Number:
  US08/973,527
• Time in Patent Office: 490 Days
• Field of Search: 210/741, 210/791, 210/106, 210/409, 210/446, 210/236, 210/357, 210/418, 210/419, 210/432, 210/744, 210/112, 210/407
• US Class Current: 210/741
• CPC Class Codes: B01D 29/25 open-ended the arrival of the mixture to be filtered and the discharge of the concentrated mixture are situated on both opposite sides of the filtering element
• CPC Class Codes: B01D 29/60 integrally combined with devices for controlling the filtration
• CPC Class Codes: B01D 29/606 by pressure measuring
• CPC Class Codes: B01D 29/6438 nozzles
• CPC Class Codes: B01D 29/72 involving vibrations
• CPC Class Codes: B01D 29/904 directing the mixture to be filtered on the filtering element in a manner to clean the filter continuously B01D29/115, B01D29/118, B01D29/17, B01D29/25, B01D29/336, B01D29/356, B01D29/902, B01D29/908 take precedence
• CPC Class Codes: B01D 29/94 for discharging the filter cake, e.g. chutes

Abstract

A method for filtering out of a liquid at least one solid substance includes supplying the liquid containing the substance via axial supply to a filter; filtering the liquid wherein the substance remains in the filter as residue; draining away the liquid; compressing a predetermined amount of residue to the shape of a solid bar under the pressure of the liquid during filtering; opening closeable discharge axially opposite the supply end during filtering; and removing the bar out of the filter under the pressure exerted by the liquid on the bar.

Claims

1. A method for filtering out of a liquid at least one solid substance, said method comprising consecutively:

supplying said liquid containing said substance via axial supply means to tube-shaped filter means;

filtering said liquid containing said substance wherein said substance remains in said filter means as residue;

draining away said liquid;

compressing a predetermined amount of residue to the shape of a solid bar under the pressure of said liquid during filtering;

opening closeable discharge means axially opposite said supply means during said filtering; and

removing said bar out of said filter means under the pressure exerted by said liquid on said bar.

2. A method according to claim 1, further comprising measuring said pressure exerted by said liquid on said bar during filtering, and opening said discharge means when a predetermined value of said pressure is attained.

3. A method according to claim 1, further comprising closing said discharge means after said bar has passed by said discharge means.

4. A method according to claim 3, further comprising:

observing said bar passing by said discharge means; and

closing said discharge means in response to said observing.

5. A method according to claim 3, further comprising closing said discharge means after a predetermined period of time required for removing said bar.

6. A method according to claim 5, further comprising observing when said bar starts to move for closing said discharge means after said predetermined period of time.

7. A method according claim 1, further comprising pounding or shaking said filter means, if said pressure in said filter means is inadequate or if a time span between opening of said discharge means and the moment in time, when said bar starts to move, exceeds a predetermined value.

8. A method according to claim 1, further comprising setting a length of said bar to be formed in said filter means by covering passages for said fluid in said filter means along at least a part of the length of said filter means.

9. A device for carrying out a method according to claim 7, said device comprising:

mainly tube-shaped filter means with housing means for collecting said filtered liquid;

supply means connected to a first axial end of said filter means for supplying said liquid containing said substance;

drain means connected to said housing means for collecting said filtered liquid; and

closeable discharge means connected to a second axial end of said filter means opposite to said supply means for removing residue filtered from said fluid containing said substance,

wherein said filter means comprises a pound or shake mechanism for release of a bar of residue in an opened state of said closeable discharge means, said bar having been formed in said filter means while filtering.

10. A device for carrying out the method according to claim 8, said device comprising:

mainly tube-shaped filter means with housing means for collecting said filtered fluid;

supply means connected to a first axial end of said filter means for supplying said fluid containing said substance;

drain means connected to said housing means for collecting said filtered fluid; and

closeable discharge means connected to a second axial end of said filter means for removing filtered and compressed residue in the shape of a bar from said filter means; and

wherein said filter means comprises covering means in close contact with said filter means and movable in the axial direction of said filter means.

11. A device for carrying out the method of claim 3, said device comprising:

mainly tube-shaped filter means with a housing for guiding said filtered fluid;

supply means connected to a first axial end of said filter means for supplying said fluid containing said sasubstance;

drain means connected to said housing means for collecting said filtered fluid;

closeable discharge means connected to a second axial end of said filter means for removing filtered and compressed residue in the shape of a bar from said filter means; and

control means for controlling opening and closing of said discharge means,

wherein said control means comprises calculating means for determining at least one of the period of time for opening said discharge means, and the moment in time for closing said discharge means.