US2725145A - Suction filters - Google Patents
Suction filters Download PDFInfo
- Publication number
- US2725145A US2725145A US196739A US19673950A US2725145A US 2725145 A US2725145 A US 2725145A US 196739 A US196739 A US 196739A US 19673950 A US19673950 A US 19673950A US 2725145 A US2725145 A US 2725145A
- Authority
- US
- United States
- Prior art keywords
- drum
- cells
- suction
- conduit
- suction chamber
- 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 - Lifetime
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D33/00—Filters with filtering elements which move during the filtering operation
- B01D33/44—Regenerating the filter material in the filter
- B01D33/46—Regenerating the filter material in the filter by scrapers, brushes nozzles or the like acting on the cake-side of the filtering element
- B01D33/466—Regenerating the filter material in the filter by scrapers, brushes nozzles or the like acting on the cake-side of the filtering element scrapers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D33/00—Filters with filtering elements which move during the filtering operation
- B01D33/06—Filters with filtering elements which move during the filtering operation with rotary cylindrical filtering surfaces, e.g. hollow drums
- B01D33/073—Filters with filtering elements which move during the filtering operation with rotary cylindrical filtering surfaces, e.g. hollow drums arranged for inward flow filtration
- B01D33/09—Filters with filtering elements which move during the filtering operation with rotary cylindrical filtering surfaces, e.g. hollow drums arranged for inward flow filtration with surface cells independently connected to pressure distributors
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D33/00—Filters with filtering elements which move during the filtering operation
- B01D33/44—Regenerating the filter material in the filter
- B01D33/46—Regenerating the filter material in the filter by scrapers, brushes nozzles or the like acting on the cake-side of the filtering element
- B01D33/465—Regenerating the filter material in the filter by scrapers, brushes nozzles or the like acting on the cake-side of the filtering element take-off rollers
Definitions
- the present invention relates to means for removing pulp from a pulp-liquid mixture and more particularly has reference to suction filters or sieves of the drum type wherein the interior of the drum is provided with means defining a suction path or paths between the drum cells and a suction chamber at either or both ends of the drum.
- the chamber may be connected to a flowoif conduit, or the chamber may be in communication with a conventional vacuum pump.
- suction filters not using a flow-01f conduit or vacuum pump but relying upon the dilference in level between the pulp-liquid mixture in the tank and that within the drum, technical advantages are obtained.
- an important object of the present invention is to provide a drum of the character described wherein each of the drum cells is connected to the suc-' tion chamber at either or both ends of the drum by means of a conduit leading from the cell to the suction chamber, the conduits being displaced angularly with respect to the suction chamber in a direction opposite to the direction of rotation of the drum.
- a special advantage is obtained at the start, because an aspirating action is obtained on the inlet or supply side of the cell even prior to the vacuum arising in the suction chamber or chambers.
- Figure 1 is an elevational view partly in section and partly broken away of one end of a drum constructed in accordance with the invention.
- Figure 2 is a sectional view taken along the line 22 of Figure l, the view looking in the direction of the arrows.
- a drum or sieve 1 is supported for rotary movement partially immersed in a tank T containing a pulp-liquid mixture and any suitable means (not shown) may be used to rotate the drum.
- the drum is provided with a horizontally extending shaft 1A and each end of the shaft is journalled in a trunnion 1B fixed to the tank wall.
- the trunnion 1B is carried by a housing 1C conveniently anchored to the wall and the housing togetherwitb a" memb'erS constitute a suction chamher:
- the member fiincludes an inner wallSA, annular surface 4 and an' outerwall' 51?.
- annular flange 5C is formed ontli'e' outer wall an'd it can beseen that the flange is disposed in" close relationsliip in the same plane to a complemental element 1 on the housing-1C.
- a packing ring: 7' embraces the! flange 5C and the element 1! to define: a: leak -proofi jointtz
- the annular surface 4 is provided with a plurality 'of equidistantly spaced apertures or inlet ports 4A and the interior of the suction chamber is in communication with a flow-ofl? conduit or fall tube 6 by means of a duct 6A formed in the housing, the duct extending through an opening 6B in the tank wall.
- the drum periphery is provided with a plurality of cells 2 and a pipe or conduit 3 extends between the exit side of adjacent cells and one of-the inlet ports 4A in the annular surface 4. More specifically, it will be noted that each conduit has been bent so that the portion of the conduit secured to the port 4A is displaced angularly in the same direction as the direction of rotation of the drum with respect to the cells 2 to which the opposite end of the conduit is attached, and the purpose of this arrangement will be later more fully set forth.
- valve plate 8 is fixed to the interior of the suction chamber, such as by stationarily supporting the plate on the housing 10 so that one end of the plate will be in contact with the inner face of the annular surface 4 duringrotation of the drum and as a consequence the member 5.
- the conduits 3 will not be subject to the aspirating effect of the chamber until the drum has: turned to a position where the plate is not covering the:
- a conventional take-01f roller and scraper combination 10 is provided for removing the pulp layer from the periphery of the drum 1.
- the invention is not to be confined to any strict conformity with the showing in the drawing but may be changed or modified so long as such changes or modifithe fall-tube whereby a vacuum may be created in the suction chamber, further means on the periphery of the drum defining cells having inlet and outlet sides, conduit defining means leading from the outlet side of each cell to the interior of the suction chamber, the point of juncture between eachconduit defining means and the suction chamber being angularly displaced in the same direction as the direction of rotation of the drum with respect to the point of juncture of the conduit means to the outlet side of the cell and valve means Within the means defining a suction chamber to prevent an aspirating effect in each of said cells until the conduit defining means leading to the chamber is not closed by the valve means.
- valve means is fixedly mounted within the means defining the suction chamber and is constituted by a plate-like element.
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Paper (AREA)
Description
United States Patent SUCTION" FIETERS Anfinm Mylius, Sogn, Oslo, Norway, assignon to iiktieholaget Kamyr, Karlstad;.Sweden ApplicationNovemberZ-I, 1950; swarm). 1%,739
2 Claims. 01. 210-199 The present invention relates to means for removing pulp from a pulp-liquid mixture and more particularly has reference to suction filters or sieves of the drum type wherein the interior of the drum is provided with means defining a suction path or paths between the drum cells and a suction chamber at either or both ends of the drum.
It is known that in order to obtain a vacuum in either or both suction chambers, the chamber may be connected to a flowoif conduit, or the chamber may be in communication with a conventional vacuum pump. I have ascertained that if in addition to the results achieved by either type of suction filter, it is possible to employ the principles of the Strindlund filter (suction filters not using a flow-01f conduit or vacuum pump but relying upon the dilference in level between the pulp-liquid mixture in the tank and that within the drum), technical advantages are obtained.
Accordingly, an important object of the present invention is to provide a drum of the character described wherein each of the drum cells is connected to the suc-' tion chamber at either or both ends of the drum by means of a conduit leading from the cell to the suction chamber, the conduits being displaced angularly with respect to the suction chamber in a direction opposite to the direction of rotation of the drum.
In this manner an increased aspirating action is obtained on the inlet or supply side of the cells while, on the exit or discharge side of the cells, a reduced re sistance against water forcing its way in from the outside surroundings is achieved.
A special advantage is obtained at the start, because an aspirating action is obtained on the inlet or supply side of the cell even prior to the vacuum arising in the suction chamber or chambers.
With the foregoing and other objects in view, the invention relates to the details of construction set forth in the following description and drawing of a preferred form of the inventive concept, it being understood that the invention is not limited to such form, since the invention recited in the claims may be embodied in numerous other assemblies.
Referring to the drawings wherein like reference legends refer to the same or similar parts and in which,
Figure 1 is an elevational view partly in section and partly broken away of one end of a drum constructed in accordance with the invention; and
Figure 2 is a sectional view taken along the line 22 of Figure l, the view looking in the direction of the arrows.
As shown in Figure 2, a drum or sieve 1 is supported for rotary movement partially immersed in a tank T containing a pulp-liquid mixture and any suitable means (not shown) may be used to rotate the drum. The drum is provided with a horizontally extending shaft 1A and each end of the shaft is journalled in a trunnion 1B fixed to the tank wall. The trunnion 1B is carried by a housing 1C conveniently anchored to the wall and the housing togetherwitb a" memb'erS constitute a suction chamher: The member fiincludes an inner wallSA, annular surface 4 and an' outerwall' 51?. An annular flange 5C is formed ontli'e' outer wall an'd it can beseen that the flange is disposed in" close relationsliip in the same plane to a complemental element 1 on the housing-1C. A packing ring: 7' embraces the! flange 5C and the element 1! to define: a: leak -proofi jointtz The annular surface 4 is provided with a plurality 'of equidistantly spaced apertures or inlet ports 4A and the interior of the suction chamber is in communication with a flow-ofl? conduit or fall tube 6 by means of a duct 6A formed in the housing, the duct extending through an opening 6B in the tank wall.
The drum periphery is provided with a plurality of cells 2 and a pipe or conduit 3 extends between the exit side of adjacent cells and one of-the inlet ports 4A in the annular surface 4. More specifically, it will be noted that each conduit has been bent so that the portion of the conduit secured to the port 4A is displaced angularly in the same direction as the direction of rotation of the drum with respect to the cells 2 to which the opposite end of the conduit is attached, and the purpose of this arrangement will be later more fully set forth.
With reference to Figure 2, it will be observed that a valve plate 8 is fixed to the interior of the suction chamber, such as by stationarily supporting the plate on the housing 10 so that one end of the plate will be in contact with the inner face of the annular surface 4 duringrotation of the drum and as a consequence the member 5. Manifestly, the conduits 3 will not be subject to the aspirating effect of the chamber until the drum has: turned to a position where the plate is not covering the:
inlet port 4A of the conduit.
It is believed apparent from the above description that the liquid with which the cells 2 are filled will causean increased aspirating action on the inlet or supply side of the cells at the beginning of the operating cycle prior to the necessary vacuum being produced in the suction chamber. This is of material value in maintaining the pulp on the drum periphery and is a marked improvement over drums equipped with merely a suction chamber.
Furthermore, it will be seen that a reduced resistance against liquid entering the discharge or exit side of the cells is obtained by virtue of the fact that the conduits or pipes 3 are not entirely filled with liquid until the conduit openings have been submerged below the liquid level in the suction chamber. However, the filtering process has been in operation in the various cells on the discharge side with less resistance than would have been the case had the full inner liquid pressure acted immediately upon the cells entering the suction cycle or Zone.
As illustrated in Figure 2, a conventional take-01f roller and scraper combination 10 is provided for removing the pulp layer from the periphery of the drum 1.
The invention is not to be confined to any strict conformity with the showing in the drawing but may be changed or modified so long as such changes or modifithe fall-tube whereby a vacuum may be created in the suction chamber, further means on the periphery of the drum defining cells having inlet and outlet sides, conduit defining means leading from the outlet side of each cell to the interior of the suction chamber, the point of juncture between eachconduit defining means and the suction chamber being angularly displaced in the same direction as the direction of rotation of the drum with respect to the point of juncture of the conduit means to the outlet side of the cell and valve means Within the means defining a suction chamber to prevent an aspirating effect in each of said cells until the conduit defining means leading to the chamber is not closed by the valve means.
2. An assemblage as defined in and claimed by claim 1 further characterized in that said valve means is fixedly mounted Within the means defining the suction chamber and is constituted by a plate-like element.
References Cited in the file of this patent UNITED STATES PATENTS 1,223,245 Biesel Apr. 17, 1917 1,816,132 Strindlund July 28, 1931 2,111,843 Daman Mar. 22, 1938 2,352,340 Oswald June 27, 1944 2,461,824 Komline Feb. 15, 1949 2,510,254 Richter June 6, 1950
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US196739A US2725145A (en) | 1950-11-21 | 1950-11-21 | Suction filters |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US196739A US2725145A (en) | 1950-11-21 | 1950-11-21 | Suction filters |
Publications (1)
Publication Number | Publication Date |
---|---|
US2725145A true US2725145A (en) | 1955-11-29 |
Family
ID=22726644
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US196739A Expired - Lifetime US2725145A (en) | 1950-11-21 | 1950-11-21 | Suction filters |
Country Status (1)
Country | Link |
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US (1) | US2725145A (en) |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2894635A (en) * | 1956-07-23 | 1959-07-14 | Dorr Oliver Inc | Sealing means for rotary drum filters |
US3313251A (en) * | 1961-12-15 | 1967-04-11 | Combustion Eng | Method and apparatus for handling and burning coal slurries |
US3362539A (en) * | 1966-03-10 | 1968-01-09 | Takahashi Risaburo | Cellulose filter apparatus |
US3865730A (en) * | 1972-09-14 | 1975-02-11 | Shell Oil Co | Oil spill cleanup |
US3947361A (en) * | 1972-10-30 | 1976-03-30 | Jackson Clifford E | Filter |
US4101374A (en) * | 1975-10-07 | 1978-07-18 | Dietrich Nebel | Dewatering device including a drum with radially slanted cells |
US4670143A (en) * | 1985-09-03 | 1987-06-02 | Bratten Jack R | Horizontal drum filter having a drive wheel and interfitting tube sections |
US4781835A (en) * | 1985-08-08 | 1988-11-01 | J. M. Voith, Gmbh | Disk concentrators |
US4956102A (en) * | 1986-09-08 | 1990-09-11 | Allsing Karl J | Method for operating rotating cylindrical filters and a rotatable cylindrical filter |
US5460019A (en) * | 1991-06-17 | 1995-10-24 | Sunds Defibrator Pori Oy | Washer |
US20210252436A1 (en) * | 2018-06-21 | 2021-08-19 | Valmet Ab | Vacuum filter |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1223245A (en) * | 1916-01-17 | 1917-04-17 | Charles Biesel | Dehydrator. |
US1816132A (en) * | 1929-06-11 | 1931-07-28 | Strindlund John | Rotary dewatering sieve |
US2111843A (en) * | 1934-03-14 | 1938-03-22 | Arthur C Daman | Filter |
US2352340A (en) * | 1942-04-10 | 1944-06-27 | Oliver United Filters Inc | Filter |
US2461824A (en) * | 1947-02-10 | 1949-02-15 | Komline Sanderson Eng Corp | Continuous rotary drum filter |
US2510254A (en) * | 1941-06-19 | 1950-06-06 | Kamyr Ab | Suction filter |
-
1950
- 1950-11-21 US US196739A patent/US2725145A/en not_active Expired - Lifetime
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1223245A (en) * | 1916-01-17 | 1917-04-17 | Charles Biesel | Dehydrator. |
US1816132A (en) * | 1929-06-11 | 1931-07-28 | Strindlund John | Rotary dewatering sieve |
US2111843A (en) * | 1934-03-14 | 1938-03-22 | Arthur C Daman | Filter |
US2510254A (en) * | 1941-06-19 | 1950-06-06 | Kamyr Ab | Suction filter |
US2352340A (en) * | 1942-04-10 | 1944-06-27 | Oliver United Filters Inc | Filter |
US2461824A (en) * | 1947-02-10 | 1949-02-15 | Komline Sanderson Eng Corp | Continuous rotary drum filter |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2894635A (en) * | 1956-07-23 | 1959-07-14 | Dorr Oliver Inc | Sealing means for rotary drum filters |
US3313251A (en) * | 1961-12-15 | 1967-04-11 | Combustion Eng | Method and apparatus for handling and burning coal slurries |
US3362539A (en) * | 1966-03-10 | 1968-01-09 | Takahashi Risaburo | Cellulose filter apparatus |
US3865730A (en) * | 1972-09-14 | 1975-02-11 | Shell Oil Co | Oil spill cleanup |
US3947361A (en) * | 1972-10-30 | 1976-03-30 | Jackson Clifford E | Filter |
US4101374A (en) * | 1975-10-07 | 1978-07-18 | Dietrich Nebel | Dewatering device including a drum with radially slanted cells |
US4781835A (en) * | 1985-08-08 | 1988-11-01 | J. M. Voith, Gmbh | Disk concentrators |
US4670143A (en) * | 1985-09-03 | 1987-06-02 | Bratten Jack R | Horizontal drum filter having a drive wheel and interfitting tube sections |
US4956102A (en) * | 1986-09-08 | 1990-09-11 | Allsing Karl J | Method for operating rotating cylindrical filters and a rotatable cylindrical filter |
US5460019A (en) * | 1991-06-17 | 1995-10-24 | Sunds Defibrator Pori Oy | Washer |
US20210252436A1 (en) * | 2018-06-21 | 2021-08-19 | Valmet Ab | Vacuum filter |
US11980837B2 (en) * | 2018-06-21 | 2024-05-14 | Valmet Ab | Rotary drum vacuum filter with a throttling valve |
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