US4266474A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chamber type filter press for de-watering sludges and similar substances
Assignee: Individual
•
Filing: 1979-10-15
•
Granted: 1981-05-12
•
Expires: 1999-10-15
Abstract
Abstract A filter apparatus comprising a gravitional extraction section 1 and a high pressure section 3. In the high pressure section 3 there is a rotatable drum 35 around which a pair of filter bands 4,5 on carrier belts 6,7 are advanced with means for applying pressure to the belts to squeeze the bands and belts together to expel water from the sludge 13 through open-topped channels formed in the carrier belts. An intermediate section 2 for applying medium pressure to the sludge may be provided and the bands and belts are continuous. Various special features like cleaning, different pressure loading systems, and driving means and other modifications are described but the principle is to progressively increase the pressure by advancing the sludge between the belt and carrier assembly and to arrange for the water expelled to be diverted through the channels 8,9 in the carrier belts with no frictional drag between the respective bands and belts as they advance at the same speed.
Inventors
- 👤 Albert Bahr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:47
CPC Classifications
B; B30; B30B; B30B9/00; B30B9/02; B30B9/24; B30B9/248; B01; B01D; B01D33/00; B01D33/04; B01D33/042; B01D33/044; B01D33/048; B01D33/056
Claims Analysis
Total Claims: 74
Claim 1
Independent Claim
208 words
A chamber-type filter press for de-watering a water containing substance comprising: a plurality of sequentially disposed fully enclosed filter chambers formed as a continuously advancing belt which are charged and discharged with said substance, said filter chambers being closed on their top and bottom sides by filter bands supported on revolving carrier belts and on their lateral sides with sealing means and at their front and rear, as viewed in the direction of advancement, by the substance to be de-watered; input means for feeding said substance between said filter bands and sealing means to form said filter chambers; and means for applying a high pressure to said filter chambers to de-water said substance comprising a plurality of pressure applying members which co-advance so as to revolve with and apply pressure to said filter chambers, and a plurality of pressure producers associated with said pressure applying members which co-advance so as to revolve with said filter chambers, each said co-advancing pressure producer originating a pressure and transmitting it to a said pressure applying member, said pressure producers, over at least a portion of the advancement of the filter chambers, causing application of a high pressure to substances contained therein which pressure increases in the direction of filter chamber advancement.
Claim 2
Dependent Claim
208 words
A chamber-type filter press for de-watering a water containing substance comprising: a plurality of sequentially disposed fully enclosed filter chambers formed as a continuously advancing belt which are charged and discharged with said substance, said filter chambers being closed on their top and bottom sides by filter bands supported on revolving carrier belts and on their lateral sides with sealing means and at their front and rear, as viewed in the direction of advancement, by the substance to be de-watered; input means for feeding said substance between said filter bands and sealing means to form said filter chambers; and means for applying a high pressure to said filter chambers to de-water said substance comprising a plurality of pressure applying members which co-advance so as to revolve with and apply pressure to said filter chambers, and a plurality of pressure producers associated with said pressure applying members which co-advance so as to revolve with said filter chambers, each said co-advancing pressure producer originating a pressure and transmitting it to a said pressure applying member, said pressure producers, over at least a portion of the advancement of the filter chambers, causing application of a high pressure to substances contained therein which pressure increases in the direction of filter chamber advancement.
Claim 3
Dependent Claim
30 words
A chamber-type filter press according to claim 1 wherein said pressure producers cause the volume or cross-section of said filter chambers to be continuously reduced with progressive filter chamber advancement.
Claim 4
Dependent Claim
22 words
A chamber-type filter press according to claim 1 wherein said pressure producers cause each filter chamber to be individually and directly pressurized.
Claim 5
Dependent Claim
23 words
A chamber-type filter press according to claim 1 wherein said filter bands and carrier belts channel water water away from said filter chambers.
Claim 6
Dependent Claim
38 words
A chamber-type filter press according to claim 4 wherein said carrier belts are plastic or rubber belts advancing on rollers, which have a surface which carries the filter bands, each said carrier belt being provided with open-topped channels.
Claim 7
Dependent Claim
19 words
A chamber-type filter press according to claim 5 wherein said channels extend across the width of said carrier. belts.
Claim 8
Dependent Claim
46 words
A chamber-type filter press according to claim 6 wherein said channels extend at an angle relative to the direction of filter chamber advancement and the carrier belts and filter band region where pressure is exerted on said filter chambers extend at an inclination to the horizontal.
Claim 9
Dependent Claim
24 words
A chamber-type filter press according to claim 7 wherein the angle of inclination of the channels relative to the direction of advancement is 45°.
Claim 10
Dependent Claim
19 words
A chamber-type filter press according to claim 6 wherein the channels of relatively opposed carrier belts cross one another.
Claim 11
Dependent Claim
29 words
A chamber-type filter press according to claim 5 wherein said carrier belts have substantial lateral rigidity and their supporting rollers are provided with guide means for said carrier belts.
Claim 12
Dependent Claim
20 words
A chamber-type filter press according to claim 10 wherein said guide means are track-holding rims or flanges on the rollers.
Claim 13
Dependent Claim
44 words
A chamber-type filter press according to claim 1 wherein the path of advancement of the filter chambers is sub-divided into several stages at each of which a different magnitude of pressure is applied to the substance to be dewatered residing between the filter bands.
Claim 14
Dependent Claim
34 words
A chamber-type filter press according to claim 12 wherein said stages comprise at least one low pressure preliminary drainage stage in addition to a high pressure stage formed by said high pressure applying means.
Claim 15
Dependent Claim
43 words
A chamber-type filter press according to claim 13 wherein said stages comprise at least one medium pressure stage applying pressure to said substance which has a magnitude between the pressure applied in said preliminary drainage stage and that of said high pressure stage.
Claim 16
Dependent Claim
57 words
A chamber-type filter press according to claim 13 wherein the preliminary drainage stage comprises a substance chamber having sides and a bottom and an inlet for the substance to be treated, the bottom of said chamber being provided by a first de-watering region of the filter band which is supported on a first of said carrier belts.
Claim 17
Dependent Claim
24 words
A chamber-type filter press according to claim 15 wherein the first carrier belt with the associated filter band advances upwardly from said substance inlet.
Claim 18
Dependent Claim
32 words
A chamber-type filter press according to claim 15 or 16 further comprising a pump for pumping a substance to be de-watered into said chamber and keeping said preliminary drainage stage under pressure.
Claim 19
Dependent Claim
31 words
A chamber-type filter press according to claim 15 further comprising means for rinsing said filter belts and means for cleaning the filtrate and/or the rinsing water collected from said rinsing means.
Claim 20
Dependent Claim
22 words
A chamber-type filter press according to claim 18 wherein the cleaning means includes a pressure gate leading to the preliminary drainage stage.
Claim 21
Dependent Claim
33 words
A chamber-type filter press according to claim 18 or 19 wherein said cleaning means is formed by an ante-chamber in the substance chamber which has an inlet connected with a filtrate return line.
Claim 22
Dependent Claim
28 words
A chamber-type filter press according to claim 20 wherein the pressure gate is connected to the ante-chamber and consists of a rotating star-shaped vaned element in a housing.
Claim 23
Dependent Claim
16 words
A chamber-type filter press according to claim 20 wherein said ante-chamber has a circular cross-sectional configuration.
Claim 24
Dependent Claim
26 words
A chamber-type filter press according to claim 22 further comprising a filter element of smaller diameter than the diameter of the ante-chamber arranged in the ante-chamber.
Claim 25
Dependent Claim
15 words
A chamber-type filter press according to claim 22 wherein said filter element is rotationally driven.
Claim 26
Dependent Claim
48 words
A chamber-type filter press according to claim 24 wherein said filter element comprises externally projecting transverse blades, ridges or fins which engage with the ante-chamber walls in such a way that the filtrate inlet is separated from the sludge chamber for every rotational position of said filter element.
Claim 27
Dependent Claim
42 words
A chamber-type filter press according to claim 15 wherein said sludge chamber is a fully enclosed and sealed chamber and the walls are predominantly formed by revolving carrier belts and filter bands and means are provided for maintaining said sealed chamber pressurized.
Claim 28
Dependent Claim
32 words
A chamber-type filter press according to claim 26 wherein said means for maintaining said sealed chamber pressurized comprises pressure rollers of a medium pressure stage provided between said sealed chamber and drum.
Claim 29
Dependent Claim
23 words
A chamber-type filter press according to claim 26 wherein said means for maintaining said sealed chamber pressurized comprises a drum high pressure stage.
Claim 30
Dependent Claim
40 words
A chamber type filter press according to claim 15 further comprising filter elements which are partly or wholly submerged in the substance under treatment arranged in the substance chamber, said filter elements comprising water outlets leading externally of said chamber.
Claim 31
Dependent Claim
19 words
A chamber-type filter press according to claim 29 wherein said filter elements are cylindrical drums made of filter material.
Claim 32
Dependent Claim
23 words
A chamber-type filter press according to claim 29 or 30 wherein said filter elements are internally or externally provided with a rotatable cleaner.
Claim 33
Dependent Claim
15 words
A chamber-type filter press according to claim 31 wherein said cleaners include internal rotatable brushes.
Claim 34
Dependent Claim
15 words
A chamber-type filter press according to claim 31 wherein said cleaners include internally fitted brushes.
Claim 35
Dependent Claim
25 words
A chamber-type filter press according to claim 31 wherein the cleaners include brushes rotatable internally of and in the opposite sense to the filter elements.
Claim 36
Dependent Claim
15 words
A chamber-type filter press according to claim 31 wherein the cleaners include liquid spraying jets.
Claim 37
Dependent Claim
17 words
A chamber-type filter press according to claim 30 further comprising a rotary drive for the filter drums.
Claim 38
Dependent Claim
33 words
A chamber-type filter press according to claim 36 wherein said filter elements rotate in the same common direction which induces a conveying action in said direction towards an outlet of the substance chamber.
Claim 39
Dependent Claim
20 words
A chamber-type filter press according to claim 29 further comprising stationary cleaners provided externally or internally of the filter elements.
Claim 40
Dependent Claim
15 words
A chamber-type filter press according to claim 38 wherein said cleaners include internally fitted brushes.
Claim 41
Dependent Claim
25 words
A chamber-type filter press according to claim 38 wherein the cleaners include brushes rotatable internally of and in the opposite sense to the filter elements.
Claim 42
Dependent Claim
15 words
A chamber-type filter press according to claim 38 wherein the cleaners include liquid spraying jets.
Claim 43
Dependent Claim
105 words
A chamber-type filter press according to claim 1 wherein said co-advancing high pressure producers comprise a plurality of revolving hydraulic cylinders mounted on opposite sides of a revolving drum of relatively large diameter, said carrier belts and filter bands revolving with said drum, said hydraulic cylinders being arranged in pairs and the pairs of hydraulic cylinders being adapted to be coupled and de-coupled to and from co-revolving supports spanning the width of the carrier belts and arranged radially outwards of the outer carrier belt and serving as said pressure applying members, the coupled hydraulic cylinders and supports defining a pressure application stage about said drum.
Claim 44
Dependent Claim
27 words
A chamber-type filter press according to claim 42 further comprising a hydraulic control system for said hydraulic cylinders including hoses, a hydraulic pump, valves and associated controls.
Claim 45
Dependent Claim
37 words
A chamber-type filter press according to claim 43 wherein said hydraulic control system is arranged within or on the drum, the energy supply to said hydraulic pump being obtained by means of slip ring collectors or terminals.
Claim 46
Dependent Claim
73 words
A chamber-type filter press according to claim 43 wherein said hydraulic control system relieves said hydraulic cylinders when said cylinders are travelling through the de-coupling and re-coupling stages of their revolution and applies pressure to said cylinders causing them to apply squeezing pressure between said drum and co-revolving supports in the pressure stage of their revolution, said squeezing pressure increasing continuously or stepwise in the forward direction of drum and filter chamber advancement.
Claim 47
Dependent Claim
55 words
A chamber-type filter press according to claim 42 wherein said hydraulic cylinders are biassed by a biassing means towards their operatively engaged or coupled position with said supports, and said filter press further comprises means provided on opposed sides of the drum for laterally diverting said hydraulic cylinders to de-couple them from said revolving supports.
Claim 48
Dependent Claim
18 words
A chamber-type filter press as in claim 46 wherein said means for laterally diverting said cylinders are cams.
Claim 49
Dependent Claim
28 words
A chamber-type filter press according to claim 47 characterized in that the hydraulic cylinders are positively guided for de-coupling and re-coupling with said supports by a guide cam.
Claim 50
Dependent Claim
19 words
A chamber-type filter press as in claim 46 wherein said means for laterally diverting said cylinders are de-coupling guideways.
Claim 51
Dependent Claim
28 words
A chamber-type filter press according to claim 49 characterized in that the hydraulic cylinders are positively guided for de-coupling and re-coupling with said supports by a control guide.
Claim 52
Dependent Claim
53 words
A chamber-type filter press according to claim 42 wherein the supports which are coupled with and decoupled from the hydraulic cylinders are mutually articulated at their lateral ends to form a revolving armour belt having one run which is substantially parallel with the outer surface of said drum in the pressure application stage.
Claim 53
Dependent Claim
40 words
A chamber-type filter press according to claim 51 wherein said supports are T-shaped and the articulated connection of the T-shaped supports is provided to the transverse support limbs which are relatively opposed along the pressure application stage of the drum.
Claim 54
Dependent Claim
39 words
A chamber-type filter press according to claim 51 wherein at least part of the return run of the armour belt acts as a revolving surface for at least one other de-watering stage connected upstream of said revolving drum stage.
Claim 55
Dependent Claim
36 words
A chamber-type filter press according to claim 53 wherein at least part of the return run of the armour belt acts as a revolving wall of a preliminary gravity drainage stage connected upstream of said drum.
Claim 56
Dependent Claim
37 words
A chamber-type filter press according to claim 53 wherein at least part of the return run of said armour belt is as a revolving support surface for a medium pressure de-watering stage connected upstream of said drum.
Claim 57
Dependent Claim
45 words
A chamber-type filter press according to claim 55 wherein said medium pressure stage is formed by pressure rollers which are biassed in a direction towards the armour belt, the carrier belts with their associated filter bands advancing between said pressure rollers and the armour belt.
Claim 58
Dependent Claim
54 words
A chamber-type filter press according to claim 42 wherein the supports which are adapted to be coupled with and decoupled from the hydraulic cylinders are independent of one another and are carried along the pressure application stage which leads around the drum by being each coupled with one hydraulic cylinder at both ends thereof.
Claim 59
Dependent Claim
51 words
A chamber-type filter press according to claim 57 further comprising drive unit at the coupling and decoupling stations for the supports for laterally displacing the support out of the region wherein the filter bands and carrier belts mount the drum and for returning the supports back towards the drum for recoupling.
Claim 60
Dependent Claim
37 words
A chamber-type filter press according to claim 57 or 58 wherein said drum is wider than the filter bands and the carrier belts and the marginal edge of the drum wall comprises guide means for the supports.
Claim 61
Dependent Claim
23 words
A chamber-type filter press according to claim 59 wherein said guide means hold the supports for lateral sliding movement relative to the drum.
Claim 62
Dependent Claim
73 words
A chamber-type filter press according to claim 42 wherein the hydraulic cylinders are mounted to provide a limited amount of pivotal movement in the direction of rotation of the drum and coupling means are provided in the form of hookshaped lugs on the supports which are engageable with piston rods of the hydraulic cylinders on entering into a path tangential to the drum and disengageable therefrom when running out of said tangential path.
Claim 63
Dependent Claim
27 words
A chamber type filter press according to claim 42, 51 or 61 wherein the supports are mounted on link-roller chains provided on both sides of said supports.
Claim 64
Dependent Claim
30 words
A chamber-type filter press according to claim 62 wherein the spacing ratio of the supports relative to the spacing ratio of the link-rollers of the chains is at least 1:3.
Claim 65
Dependent Claim
21 words
A chamber-type filter press according to claim 1 wherein the circumferential revolution distance around the drum is sub-divided into several stages.
Claim 66
Dependent Claim
36 words
A chamber-type filter press according to claim 1 wherein the lateral seals of the filter chambers are provided by separately advancing sealing elements which are inserted between the filter bands on both sides of the chamber.
Claim 67
Dependent Claim
28 words
A chamber-type filter press according to claim 65 wherein the sealing elements are of circular cross-section and comprise continuous deformable rubber elements which advance with the filter bands.
Claim 68
Dependent Claim
17 words
A chamber-type filter press according to claim 65 or 66 wherein the sealing elements are hollow hoses.
Claim 69
Dependent Claim
17 words
A chamber-type filter press according to claim 67 wherein the sealing elements are filled with compressed air.
Claim 70
Dependent Claim
22 words
A chamber-type filter press according to claim 68 further comprising valves in the sealing elements for refilling said sealing element with air.
Claim 71
Dependent Claim
28 words
A chamber-type filter press according to claim 1 wherein the lateral seals of the filter chambers are provided by elastically deformable gasket strips secured on the filter bands.
Claim 72
Dependent Claim
27 words
A chamber-type filter press according to claim 70 wherein the gaskets from different filter bands are adapted to inter-engage when the associated filter bands are mutually opposed.
Claim 73
Dependent Claim
182 words
A chamber-type filter press for de-watering a water containing substance comprising: a continuously advancing belt assembly which is charged and discharged with said substance, said belt assembly comprising a pair of filter belts supported on respective revolving carrier belts and sealing means located on opposite lateral sides of and between the filter belts; input means for feeding said substance between said filter belts and sealing means; and means for applying a high pressure to said belt assembly to de-water a substance contained therein, said high pressure applying means comprising a plurality of pressure applying members co-advancing so as to revolve with said belt assembly for applying pressure thereto and a plurality of pressure producers respectively associated with said pressure applying members and co-advancing so as to revolve with said belt assembly, each said pressure producer originating a pressure and transmitting it to a said pressure applying member, said pressure producers, over at least a portion of the advancement of the belt assembly, causing application of a high pressure to substance contained therein which pressure increases in the direction of belt assembly advancement.
Claim 74
Dependent Claim
182 words
A chamber-type filter press for de-watering a water containing substance comprising: a continuously advancing belt assembly which is charged and discharged with said substance, said belt assembly comprising a pair of filter belts supported on respective revolving carrier belts and sealing means located on opposite lateral sides of and between the filter belts; input means for feeding said substance between said filter belts and sealing means; and means for applying a high pressure to said belt assembly to de-water a substance contained therein, said high pressure applying means comprising a plurality of pressure applying members co-advancing so as to revolve with said belt assembly for applying pressure thereto and a plurality of pressure producers respectively associated with said pressure applying members and co-advancing so as to revolve with said belt assembly, each said pressure producer originating a pressure and transmitting it to a said pressure applying member, said pressure producers, over at least a portion of the advancement of the belt assembly, causing application of a high pressure to substance contained therein which pressure increases in the direction of belt assembly advancement.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-05-11 | 1984-11-10 | 1985-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-11 | 1988-11-10 | 1989-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-11 | 1992-11-10 | 1993-05-12 | $7700.00 | Window Closed / Lapsed |