CA1067832A - Centrifugal pressure filter with horizontal filter disks - Google Patents
Centrifugal pressure filter with horizontal filter disksInfo
- Publication number
- CA1067832A CA1067832A CA266,179A CA266179A CA1067832A CA 1067832 A CA1067832 A CA 1067832A CA 266179 A CA266179 A CA 266179A CA 1067832 A CA1067832 A CA 1067832A
- Authority
- CA
- Canada
- Prior art keywords
- filter
- shaft
- shaft section
- casing
- long
- 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
Links
- 239000000725 suspension Substances 0.000 claims abstract description 25
- 239000000706 filtrate Substances 0.000 claims abstract description 13
- 238000007789 sealing Methods 0.000 claims abstract description 7
- 230000008878 coupling Effects 0.000 claims description 2
- 238000010168 coupling process Methods 0.000 claims description 2
- 238000005859 coupling reaction Methods 0.000 claims description 2
- 239000012065 filter cake Substances 0.000 description 6
- 239000007787 solid Substances 0.000 description 6
- 239000002245 particle Substances 0.000 description 5
- 230000003628 erosive effect Effects 0.000 description 2
- 238000011001 backwashing Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000000875 corresponding effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/39—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with hollow discs side by side on, or around, one or more tubes, e.g. of the leaf type
- B01D29/41—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with hollow discs side by side on, or around, one or more tubes, e.g. of the leaf type mounted transversely on the tube
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/62—Regenerating the filter material in the filter
- B01D29/70—Regenerating the filter material in the filter by forces created by movement of the filter element
- B01D29/74—Regenerating the filter material in the filter by forces created by movement of the filter element involving centrifugal force
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Filtration Of Liquid (AREA)
- Filtering Materials (AREA)
- Centrifugal Separators (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A centrifugal pressure filter has horizontal filter discs carried by a hollow shaft for the discharge of filtrate. The shaft is made in two sections, a long section carrying the filter discs and a short section that is mounted to the bottom of the filter casing and carries the requisite dynamic seal for sealing the suspension chamber of the filter. The long shaft section can be lifted out of engagement with the short section so that the filter disc package can be removed for servicing without disturbing the dynamic seal.
A centrifugal pressure filter has horizontal filter discs carried by a hollow shaft for the discharge of filtrate. The shaft is made in two sections, a long section carrying the filter discs and a short section that is mounted to the bottom of the filter casing and carries the requisite dynamic seal for sealing the suspension chamber of the filter. The long shaft section can be lifted out of engagement with the short section so that the filter disc package can be removed for servicing without disturbing the dynamic seal.
Description
~86';~83~
The present invention relates to a centrifugal pressure filter with horizontal filter discs, the filtrat0 being discharged via a central hollow shaft. Centrifugal filters serve to remove solids from suspensions.
Centrifugal filters of the type described above are usually subjected to heavy loads, i.e. severe wear and tear, firstly due to the selected operat-ing pressure and secondly by the suspension to be filtered, or more preciselyJ
the eroding characteristics of the solid particles contained in the suspension.
As a result, the filter must be checked at monthly to yearly intervals and it might be necessary to renew the screens on the filter discs just as often.
Conventional centrifugal pressure filters have a plurality of horizontal filter discs arranged on a central hollow shaft with a correspond-ing number of intermediate seals. The filtrate outlet of each filter disc is connected to the inside of the central hollow shaft via openings. The horizon-tal filter disc package and the central hollow shaft are arranged in a pressure casing and supported by bearings at both ends, i.e. at the top and bottom of the casing, in such a manner that the filter package can be rotated at high speed in order to centrifuge the filter cake. The suspension chamber within the casing and surrounding the filter package is isolated from the bearings of the central shaft by means of dynamic seals in order to prevent solid part-icles from penetrating into the bearings, as otherwise the bearings would be destroyed wi~hin a very short time.
Pressure filters which are known at present are operated in such a manner that the suspension containing solid particles is fed into the casing under pressure via intake nozzles when the pressure filter disc package is not rotating. The suspension is separated into filtrate and filter cake by means of the filter screen on the filter discs. The filtrate enters the filtrate spaces in the filter discs and the central hollow shaft and leaves the centri-fugal filter through radial openings in ~he lower part of the central hollow shaft and through an outlet nozzle. When the suspension is continuously being Ped into the cen~riugal fil~er, solids in the form of a filter cake settle -1- ~
r~
101~'7~3Z
on the filter disks after some time, i.e. after several hou~s or minutes, to such an extent that the throughput decreases considerably. The filter must then be cleaned. For this pul~ose, the suspenslon feed and the filtrate discharge are interrupted, the filter package on the central hollow shaft is rotated and the filter cake is then centrifuged from the filter disks. The filter cake is removed at the lowest point of the filter casing via a dis-charge opening. If necessary, thorough cleaning of the filter disk screens can be achieved by means of backwashing~ After the filter has been cleaned, the suspension feed is recommenced. In order to ensure continuous operation, suspension filtering units usually contain a number of centrifugal filters so that individual filters can be cleaned or serviced in turn without operation being interrupted The servicing of a centrifugal filter takes up consider-able time. When the filter casing is opened, either the filter package, arranged on the central hollow shaft, is removed and placed outside the casing for inspection and, if necessary, relining of the filter disks, or ihe shaft is le~t in the casing and the filter disks are removed one by one, relined and then replaced on the central hollow shaft in the casing, altern-ately with the intermediate seals.
Centrifugal filters of the types known up to now, i.e. those with removable shafts and those with fixed shafts have considerable disadvantages.
The ~ilter package arranged on the shaft can only be removed and inserted by means of a crane and the insertion of the shaft into the dynamic seals cannot be observed due to its inaccessibility, which means that these seals are likely to be damaged or not fitted properly resulting in poor sealing.
Placing the new filter disks and intermediate seals individually onto a shaft which is arranged in the casing, takes up a considerable amount of time because of the lack of space available, and there is no possibility of observing the lowermost disks. In both cases, defects, such as short circuits for the flow of suspension, cannot be detected until after start-up, i.e. until afte~ the casing has been closed tight and all the feed and 7~33;Z
discharge lines have been connected. It has been found that, for known centrifugal filters, thç leakage rate can be considerable after the filter discs have been relined and reassembled.
The object of the invention is to improve upon the known designs.
According to the present invention there is provided a centrifugal pressure filter having a casing defining a suspension chamber, horizontal filter discs in the chamber and a vertical shaft extending through the chamber and carrying the discs, the shaft being hollow for the discharge of filtrate therethrough, characterized in tha~ the hollow shaft comprises at least two shaft sections, a long shaft section carrying the discs, and a short shaft section coupled to an end of the long shaft section by an axially disengageable coupling, the short shaft section having a bearing located outside the suspension chamber and a dynamic seal package sealing the short shaft section to the casing so as to isolate a filtrate outlet from the suspension chamber and at least one seal sealing the long and short shaft sections so as to isolate the suspension chamber from the centre of the hollow shaft.
In order to facilitate the checking or removal of the bearing of the short shaft section without having to remove the filter package, a preferred embodiment of the invention provides the long shaft section with a stop ring at the end adjacent the short shaft section.
The advantages achieved with the invention lie mainly in the fact that it obviates the need for careful removal and replacement of the central shaft from and into the dynamic seal, which was hitherto necessary for routine servicing of the filter package for the purpose of relining the filter discs.
It also rules out the possibility of damage to the dynamic seal during servic-ing and thus the risk of time-consuming repairs to the centrifugal filter.
The inventive design is particularly advantageous for centrifugal filters which are used for suspensions with highly erosive, i.e. hard, solid ~0 particles. In such cases, if hard particles come into contact with the seal 9L0~i'78~Z
when inse~ting the centxal hollow shat ~ith filter disks into a conventionally arranged dynamic seal, the seal would be destroyed within a short time To summarize, it follows that, due to the present design of the centrifugal pressure filter, its operational availability is greatly increased and the service life of the dynamic seal is independent of the number of times the filter package is serviced.
An embodiment of the invention is shown in the drawings and is described in detail below.
Figure 1 shows a complete cross-section of a centrifugal pressure filter Figure 2 shows the lower section of Figure l comprising bearing and seal.
The cylindrical centrifugal pressure filter casing (l) in Figure 1 is arranged vertically and is closed a~ the top with a cover ~2) which has the same inside diameter as the casing. The filter disks ~3) arranged with intermediate seals on the long shaft section ~4) form the fil~er package.
The long shaft section ~4) is held at the top by the bearing ~5) and is torsionally coupled at the bottom in an axially disengageable manner to the short shaft section ~6). The short shaft section ~6) its bearing ~7) and the dynamic seal package ~8) are accommodated mainly inside the lower bearing casing (9). The outlet nozzle ~10) for the filtrate ~clarified liquid) is also situated on the bearing casing ~9). The casing ~1) has nozzle ~11) at the bottom for discharging the filter cake.
Figure 2 shows that, during shut-down of the filter package, the suspension to be filtered leaves the suspension chamber ~12) of the casing via the filter disks ~3) lined with filter screens and passes in the form of filtrate through the radial openings in the long section of the shaft ~4) into the central bore ~13) of the long shaft section and flows downwards via the short shaft section ~6), which is hollow at one end, through the outlet openings of this shaft and finally through the outlet nozzle ~10). The seal ~0~332 package (8) between the short shaft section ~6) and the bearing casing (9) is the dynamic seal which prevents suspension from the suspension chamber mixing with the filtrate. In the embodiment illustrated, the seal rings are shown as lip seals, but any other reliable type may also be used.
When the filter package is removed from the casing, the short shaft section (6), the bea~ing (7) and the dynamic seal package (8) are not displaced in relation to the seal lips and seal lip contact surfaces. Consequently, this seal package cannot be damaged by the repeated removal and replacement of the filter package. The seal ~14) between the short shaft section (6) and the long shaft section (4) represents the internal sealing between the two shaft sections.
The collar (15) serves to pre-seal the suspension chamber.
By means of the lower bearing, the filter package is held in such a position in relation to the casing that there is a clearance between the stop ring (16) on the long shaft section and the bottom of the casing. The lower bearing casing together with the short shaft section can thus be remo~ed easily, if this should be necessary for any reason. When the bolts for fixing the bearing casing on the bottom of the centrifugal pressure filter have been loos-ened, the s~op ring of the long shaft section and,~consequently, the long shaft section itself, will rest on the bottom of the filter casing. When the lower bearing casing is re-inserted, the package is raised, and after assembly, the centrifugal pressure filter is completely operable without the filter package having had to be removed.
The present invention relates to a centrifugal pressure filter with horizontal filter discs, the filtrat0 being discharged via a central hollow shaft. Centrifugal filters serve to remove solids from suspensions.
Centrifugal filters of the type described above are usually subjected to heavy loads, i.e. severe wear and tear, firstly due to the selected operat-ing pressure and secondly by the suspension to be filtered, or more preciselyJ
the eroding characteristics of the solid particles contained in the suspension.
As a result, the filter must be checked at monthly to yearly intervals and it might be necessary to renew the screens on the filter discs just as often.
Conventional centrifugal pressure filters have a plurality of horizontal filter discs arranged on a central hollow shaft with a correspond-ing number of intermediate seals. The filtrate outlet of each filter disc is connected to the inside of the central hollow shaft via openings. The horizon-tal filter disc package and the central hollow shaft are arranged in a pressure casing and supported by bearings at both ends, i.e. at the top and bottom of the casing, in such a manner that the filter package can be rotated at high speed in order to centrifuge the filter cake. The suspension chamber within the casing and surrounding the filter package is isolated from the bearings of the central shaft by means of dynamic seals in order to prevent solid part-icles from penetrating into the bearings, as otherwise the bearings would be destroyed wi~hin a very short time.
Pressure filters which are known at present are operated in such a manner that the suspension containing solid particles is fed into the casing under pressure via intake nozzles when the pressure filter disc package is not rotating. The suspension is separated into filtrate and filter cake by means of the filter screen on the filter discs. The filtrate enters the filtrate spaces in the filter discs and the central hollow shaft and leaves the centri-fugal filter through radial openings in ~he lower part of the central hollow shaft and through an outlet nozzle. When the suspension is continuously being Ped into the cen~riugal fil~er, solids in the form of a filter cake settle -1- ~
r~
101~'7~3Z
on the filter disks after some time, i.e. after several hou~s or minutes, to such an extent that the throughput decreases considerably. The filter must then be cleaned. For this pul~ose, the suspenslon feed and the filtrate discharge are interrupted, the filter package on the central hollow shaft is rotated and the filter cake is then centrifuged from the filter disks. The filter cake is removed at the lowest point of the filter casing via a dis-charge opening. If necessary, thorough cleaning of the filter disk screens can be achieved by means of backwashing~ After the filter has been cleaned, the suspension feed is recommenced. In order to ensure continuous operation, suspension filtering units usually contain a number of centrifugal filters so that individual filters can be cleaned or serviced in turn without operation being interrupted The servicing of a centrifugal filter takes up consider-able time. When the filter casing is opened, either the filter package, arranged on the central hollow shaft, is removed and placed outside the casing for inspection and, if necessary, relining of the filter disks, or ihe shaft is le~t in the casing and the filter disks are removed one by one, relined and then replaced on the central hollow shaft in the casing, altern-ately with the intermediate seals.
Centrifugal filters of the types known up to now, i.e. those with removable shafts and those with fixed shafts have considerable disadvantages.
The ~ilter package arranged on the shaft can only be removed and inserted by means of a crane and the insertion of the shaft into the dynamic seals cannot be observed due to its inaccessibility, which means that these seals are likely to be damaged or not fitted properly resulting in poor sealing.
Placing the new filter disks and intermediate seals individually onto a shaft which is arranged in the casing, takes up a considerable amount of time because of the lack of space available, and there is no possibility of observing the lowermost disks. In both cases, defects, such as short circuits for the flow of suspension, cannot be detected until after start-up, i.e. until afte~ the casing has been closed tight and all the feed and 7~33;Z
discharge lines have been connected. It has been found that, for known centrifugal filters, thç leakage rate can be considerable after the filter discs have been relined and reassembled.
The object of the invention is to improve upon the known designs.
According to the present invention there is provided a centrifugal pressure filter having a casing defining a suspension chamber, horizontal filter discs in the chamber and a vertical shaft extending through the chamber and carrying the discs, the shaft being hollow for the discharge of filtrate therethrough, characterized in tha~ the hollow shaft comprises at least two shaft sections, a long shaft section carrying the discs, and a short shaft section coupled to an end of the long shaft section by an axially disengageable coupling, the short shaft section having a bearing located outside the suspension chamber and a dynamic seal package sealing the short shaft section to the casing so as to isolate a filtrate outlet from the suspension chamber and at least one seal sealing the long and short shaft sections so as to isolate the suspension chamber from the centre of the hollow shaft.
In order to facilitate the checking or removal of the bearing of the short shaft section without having to remove the filter package, a preferred embodiment of the invention provides the long shaft section with a stop ring at the end adjacent the short shaft section.
The advantages achieved with the invention lie mainly in the fact that it obviates the need for careful removal and replacement of the central shaft from and into the dynamic seal, which was hitherto necessary for routine servicing of the filter package for the purpose of relining the filter discs.
It also rules out the possibility of damage to the dynamic seal during servic-ing and thus the risk of time-consuming repairs to the centrifugal filter.
The inventive design is particularly advantageous for centrifugal filters which are used for suspensions with highly erosive, i.e. hard, solid ~0 particles. In such cases, if hard particles come into contact with the seal 9L0~i'78~Z
when inse~ting the centxal hollow shat ~ith filter disks into a conventionally arranged dynamic seal, the seal would be destroyed within a short time To summarize, it follows that, due to the present design of the centrifugal pressure filter, its operational availability is greatly increased and the service life of the dynamic seal is independent of the number of times the filter package is serviced.
An embodiment of the invention is shown in the drawings and is described in detail below.
Figure 1 shows a complete cross-section of a centrifugal pressure filter Figure 2 shows the lower section of Figure l comprising bearing and seal.
The cylindrical centrifugal pressure filter casing (l) in Figure 1 is arranged vertically and is closed a~ the top with a cover ~2) which has the same inside diameter as the casing. The filter disks ~3) arranged with intermediate seals on the long shaft section ~4) form the fil~er package.
The long shaft section ~4) is held at the top by the bearing ~5) and is torsionally coupled at the bottom in an axially disengageable manner to the short shaft section ~6). The short shaft section ~6) its bearing ~7) and the dynamic seal package ~8) are accommodated mainly inside the lower bearing casing (9). The outlet nozzle ~10) for the filtrate ~clarified liquid) is also situated on the bearing casing ~9). The casing ~1) has nozzle ~11) at the bottom for discharging the filter cake.
Figure 2 shows that, during shut-down of the filter package, the suspension to be filtered leaves the suspension chamber ~12) of the casing via the filter disks ~3) lined with filter screens and passes in the form of filtrate through the radial openings in the long section of the shaft ~4) into the central bore ~13) of the long shaft section and flows downwards via the short shaft section ~6), which is hollow at one end, through the outlet openings of this shaft and finally through the outlet nozzle ~10). The seal ~0~332 package (8) between the short shaft section ~6) and the bearing casing (9) is the dynamic seal which prevents suspension from the suspension chamber mixing with the filtrate. In the embodiment illustrated, the seal rings are shown as lip seals, but any other reliable type may also be used.
When the filter package is removed from the casing, the short shaft section (6), the bea~ing (7) and the dynamic seal package (8) are not displaced in relation to the seal lips and seal lip contact surfaces. Consequently, this seal package cannot be damaged by the repeated removal and replacement of the filter package. The seal ~14) between the short shaft section (6) and the long shaft section (4) represents the internal sealing between the two shaft sections.
The collar (15) serves to pre-seal the suspension chamber.
By means of the lower bearing, the filter package is held in such a position in relation to the casing that there is a clearance between the stop ring (16) on the long shaft section and the bottom of the casing. The lower bearing casing together with the short shaft section can thus be remo~ed easily, if this should be necessary for any reason. When the bolts for fixing the bearing casing on the bottom of the centrifugal pressure filter have been loos-ened, the s~op ring of the long shaft section and,~consequently, the long shaft section itself, will rest on the bottom of the filter casing. When the lower bearing casing is re-inserted, the package is raised, and after assembly, the centrifugal pressure filter is completely operable without the filter package having had to be removed.
Claims (2)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A centrifugal pressure filter having a casing defining a suspension chamber, horizontal filter discs in the chamber and a vertical shaft extending through the chamber and carrying the discs, the shaft being hollow for the discharge of filtrate therethrough, characterized in that the hollow shaft comprises at least two shaft sections, a long shaft section carrying the discs, and a short shaft section coupled to an end of the long shaft section by an axially disengageable coupling, the short shaft section having a bearing located outside the suspension chamber and a dynamic seal package sealing the short shaft section to the casing so as to isolate a filtrate outlet from the suspension chamber and at least one seal sealing the long and short shaft sections so as to isolate the suspension chamber from the centre of the hollow shaft.
2. A centrifugal pressure filter according to claim 1, characterized in that the long shaft section is equipped with a stop ring on the end thereof adjacent the short shaft section.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2552515A DE2552515C3 (en) | 1975-11-22 | 1975-11-22 | Rotary pressure filter with horizontal filter plates |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1067832A true CA1067832A (en) | 1979-12-11 |
Family
ID=5962422
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA266,179A Expired CA1067832A (en) | 1975-11-22 | 1976-11-19 | Centrifugal pressure filter with horizontal filter disks |
Country Status (13)
| Country | Link |
|---|---|
| JP (1) | JPS5286568A (en) |
| BE (1) | BE847819A (en) |
| BR (1) | BR7607743A (en) |
| CA (1) | CA1067832A (en) |
| CH (1) | CH614388A5 (en) |
| DE (1) | DE2552515C3 (en) |
| FR (1) | FR2334400A1 (en) |
| GB (1) | GB1549339A (en) |
| IN (1) | IN144610B (en) |
| IT (1) | IT1064371B (en) |
| NL (1) | NL7612846A (en) |
| SE (1) | SE412320B (en) |
| ZA (1) | ZA766609B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102350113A (en) * | 2011-07-21 | 2012-02-15 | 上海安赐机械设备有限公司 | Scraping disc type filter |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH578998A5 (en) * | 1973-10-17 | 1976-08-31 | Mueller Hans Maennedorf | |
| DE2848188A1 (en) * | 1978-11-07 | 1980-05-08 | Schenk Filterbau Gmbh | Pressure disc filter with centrifugal cake removal - having shaft seals protected from the shaft by rotating collar to reduce wear |
| FR2526336B1 (en) * | 1982-05-07 | 1986-01-31 | Sermia | SCREENER FOR THE SEPARATION OF SOLID PARTICLES CONTAINED IN A LIQUID |
| DE3323368A1 (en) * | 1983-06-29 | 1985-01-03 | Uhde Gmbh, 4600 Dortmund | DEVICE ON A SHAFT PASSAGE OF A PRESSURIZED HOUSING |
| JP5299784B2 (en) * | 2009-10-26 | 2013-09-25 | 株式会社Ｉｈｉ | Leaf filter shaft sealing device and method |
| WO2023110632A1 (en) | 2021-12-16 | 2023-06-22 | Mercedes-Benz Group AG | Method for producing a single battery cell and strip material for producing a single battery cell |
-
1975
- 1975-11-22 DE DE2552515A patent/DE2552515C3/en not_active Expired
-
1976
- 1976-10-29 BE BE171945A patent/BE847819A/en not_active IP Right Cessation
- 1976-10-29 IN IN1971/CAL/1976A patent/IN144610B/en unknown
- 1976-11-04 ZA ZA766609A patent/ZA766609B/en unknown
- 1976-11-11 IT IT29263/76A patent/IT1064371B/en active
- 1976-11-18 SE SE7612900A patent/SE412320B/en not_active IP Right Cessation
- 1976-11-18 NL NL7612846A patent/NL7612846A/en not_active Application Discontinuation
- 1976-11-19 GB GB48359/76A patent/GB1549339A/en not_active Expired
- 1976-11-19 CH CH1461376A patent/CH614388A5/en not_active IP Right Cessation
- 1976-11-19 CA CA266,179A patent/CA1067832A/en not_active Expired
- 1976-11-19 BR BR7607743A patent/BR7607743A/en unknown
- 1976-11-22 JP JP13963176A patent/JPS5286568A/en active Granted
- 1976-11-22 FR FR7635074A patent/FR2334400A1/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102350113A (en) * | 2011-07-21 | 2012-02-15 | 上海安赐机械设备有限公司 | Scraping disc type filter |
Also Published As
| Publication number | Publication date |
|---|---|
| DE2552515B2 (en) | 1980-01-31 |
| SE412320B (en) | 1980-03-03 |
| FR2334400A1 (en) | 1977-07-08 |
| ZA766609B (en) | 1977-10-26 |
| CH614388A5 (en) | 1979-11-30 |
| SE7612900L (en) | 1977-05-23 |
| DE2552515C3 (en) | 1980-09-25 |
| JPS5286568A (en) | 1977-07-19 |
| IT1064371B (en) | 1985-02-18 |
| NL7612846A (en) | 1977-05-24 |
| FR2334400B1 (en) | 1982-11-12 |
| IN144610B (en) | 1978-05-20 |
| DE2552515A1 (en) | 1977-06-08 |
| GB1549339A (en) | 1979-08-01 |
| JPS5537932B2 (en) | 1980-10-01 |
| BR7607743A (en) | 1977-10-04 |
| BE847819A (en) | 1977-02-14 |
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