EP0159422B1 - Screw decanter type centrifugal concentrating machine - Google Patents
Screw decanter type centrifugal concentrating machine Download PDFInfo
- Publication number
- EP0159422B1 EP0159422B1 EP84302070A EP84302070A EP0159422B1 EP 0159422 B1 EP0159422 B1 EP 0159422B1 EP 84302070 A EP84302070 A EP 84302070A EP 84302070 A EP84302070 A EP 84302070A EP 0159422 B1 EP0159422 B1 EP 0159422B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- bowl
- liquid
- space
- conveyor
- screw
- 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
- 239000007788 liquid Substances 0.000 claims abstract description 63
- 238000000926 separation method Methods 0.000 claims abstract 5
- 239000011796 hollow space material Substances 0.000 claims abstract 2
- 238000007599 discharging Methods 0.000 claims description 7
- 239000000725 suspension Substances 0.000 abstract description 10
- 239000011343 solid material Substances 0.000 abstract description 6
- 239000002245 particle Substances 0.000 description 10
- 239000007787 solid Substances 0.000 description 10
- 230000008021 deposition Effects 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 2
- 239000010802 sludge Substances 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04B—CENTRIFUGES
- B04B1/00—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles
- B04B1/20—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles discharging solid particles from the bowl by a conveying screw coaxial with the bowl axis and rotating relatively to the bowl
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04B—CENTRIFUGES
- B04B1/00—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles
- B04B1/20—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles discharging solid particles from the bowl by a conveying screw coaxial with the bowl axis and rotating relatively to the bowl
- B04B2001/2083—Configuration of liquid outlets
Definitions
- the present invention relates to a screw decanter type centrifugal concentrating machine and more particularly to an improved screw decanter type centrifugal concentrating machine for continuously treating so-called suspension containing fine solid particles in liquid with the aid of centrifugal force to separate it into concentrated liquid containing a high content of solid particles and residual liquid containing no solid particle or a very small amount of solid particles.
- a hitherto known screw decanter type centrifugal concentrating machine is generally constructed such that a required number of nozzles of which bore is selectively determined are disposed at the position located in the vicinity of a deposition area at the one end of a bowl where solid particles conveyed by a screw are deposited so as to discharge deposited solid particles through the nozzles which are usually located on a side wall 3 as illustrated in Fig. 1.
- drawbacks inherent to the conventional centrifugal concentrating machine that it is possible to change a discharge rate of liquid through nozzles during operation of the machine and moreover carry out immediate adjustment in response to fluctuation in supply rate of suspension, concentration of solid particles or the like and that there is necessity for interrupting operation of the machine at every time when there occurs such a trouble that nozzles are clogged with foreign material.
- Other drawbacks of the conventional machine are loss in kinematic energy due to discharging of concentrated liquid and residual liquid from the circumference of the bowl, power loss due to blower function and air resistance caused by projections and openings for the arrangement of nozzles and liquid level adjustment during rotation of the bowl and power loss due to scattering of flowing air through openings on the outer casing of the bowl.
- the present invention has been made with the foregoing drawbacks in mind and its object resides in providing an improved screw decanter type centrifugal concentrating machine which can easily adjust a ratio of flow rate of concentrated liquid to that of residual liquid in response to fluctuation in flow rate of supplied suspension, concentration of solid material or the like during operation of the machine and thereby assure a required concentration of concentrated liquid while consuming a reduced amount of power required for rotating the bowl.
- DE-A-3 317 047 describes a screw decanter type centrifugal concentrating machine in accordance with the prior art portion of claim 1. This is operated by continuously supplying suspension through the one support shaft for the bowl into the interior of the latter while it is rotating, causing solid material in suspension to be deposited on the inner surface of the bowl under the influence of centrifugal force, displacing deposited solid material toward the one end part of the bowl with the aid of a screw conveyor of which the outer diameter is dimensioned appreciably smaller than the inner diameter of the bowl and which is coaxially rotated in the same direction as that of the bowl at a different rotational speed from that of the same, and continuously discharging concentrated liquid and residual liquid through the inner spaces in and about the outer horizontally extending hollow shafts.
- the present invention as characterised in claim 1, not only provides for simultaneous control of the discharge rate of both concentrated liquid and residual liquid, but also saves energy by the manner in which inlet liquid to be treated is fed smoothly into the space between the conveyor and the bowl, being accelerated by the guide vanes.
- a horizontally extending bowl 1 has side walls 2 and 3 fixedly secured thereto. Each of the side walls 2 and 3 is made integral with a hollow shaft which is horizontally supported by means of ball bearings 4 and 5.
- the lefthand shaft as seen in the drawing extends further through the ball bearing 4 and carries a pulley 6 at its foremost and which is fixedly mounted thereon.
- a screw conveyor 7 includes a cylindrical barrel 9 and a spirally extending blade 8 in the form of a screw is integrally mounted on the barrel 9. As is apparent from the drawing, the outer diameter of the blade 8 is dimensioned appreciably smaller than the inner diameter of the bowl 1.
- the barrel has hollow shafts 12 and 13 fixedly secured to its side portions 10 and 11.
- the hollow shaft 12 is rotatably supported by means of ball bearings 14 firmly fitted into the pulley 6, whereas the hollow shaft 13 is rotatably supported by means of ball bearings 15.
- the screw conveyor 7 is horizontally supported in the coaxial relation relative to the bowl 1 with the aid of both the hollow shafts 12 and 13.
- the bowl 1 is rotated by the pulley 6 at a predetermined speed, whereas the screw conveyor 7 is rotated by the pulley 27 at another predetermined speed lower than that of the bowl 1.
- Suspension F to be treated is introduced into the interior of the bowl 1 via an inlet port 16 attached to the foremost end of the hollow shaft 12 with a sealing member disposed on the latter, the cylindrical space 28 of the hollow shaft 12 and a plurality of radially extending guide vanes 17 on the inner surface of the side wall 2.
- the guide vanes 17 serve to accelerate flowing speed of suspension F to a level correspondng to rotational speed of the bowl 1 whereby turbulence of suspension on the bowl 1 can be minimized.
- solid particles in suspension enter the bowl 1, they are caused to be displaced toward the inner surface of the bowl 1 under the influence of centrifugal force produced by rotation of the latter and thereafter they are conveyed toward the side wall 3 with the aid of the screw conveyor.
- Concentrated liquid S is scooped by a plurality of scooping tubes 18 or grooves equivalent to the scooping tubes 18 and flows through the tubular space as defined by the axial extension 29 of the side wall 3 and the hollow shaft 13 so that it is continuously discharged from a concentrated liquid outlet port 21.
- residual liquid L with no solid particle contained therein is scooped into a plurality of radially extending passages 20 on the guide plate 19 and flows through the cylindrical space 30 in the hollow shaft 13 so that it is continuously discharged from a residual liquid outlet port 24 via a residual liquid discharging device 22 disposed at the outermost end of the hollow shaft 13.
- the discharging device 22 is provided with a hydraulically operated throttle valve 23 of which opening is adjusted such that a volumetric ratio of concentrated liquid to residual liquid, that is, concentration of solid particle in concentrated liquid and residual liquid is maintained within a predetermined range.
- Fig. 5 schematically illustrates flowing of liquid and displacement of solid material as described above with reference to Fig. 1.
- a throttle valve 26 adapted to be adjusted from the outside is disposed at the position located outwardly of the concentrated liquid outlet port 21 in order that concentration and flow rate of concentrated liquid are maintained within a predetermined range.
- a flow rate of liquid to be supplied is adjusted in dependence on the adjustment of the throttle valve 23 as described above.
- These throttle valves may be designed in the form of automatically controlled valves. By employing automatically controlled valves it is possible to automatically operate the centrifugal concentrating machine of the invention while adjustment is made in dependence on flow rate or concentration of initial liquid prior to separating.
- centrifugal concentrating machine of the invention Another advantageous feature of the centrifugal concentrating machine of the invention is that power required for rotating the machine can be reduced.
- power consumed for operating the centrifugal concentrating machine can be expressed by the following equation on the assumption that positional energy and kinematic energy of supplied liquid are neglected.
- P total consumed power
- P o power consumed at a time when the machine is not loaded, that is, when no liquid is supplied
- Q 1 discharge rate of concentrated liquid
- E 1 is kinematic energy carried by concentrated liquid
- Q 2 discharge rate of residual liquid
- E 2 is kinematic energy carried by residual liquid
- 11 is inside loss coefficient.
- kinematic energy of discharged liquid is in proportion to square of peripheral speed as measured at the discharge position. Since the machine of the invention is constructed such that the discharge position is located closer to the axis of rotation than that of the conventional machine, kinematic energy required for the former can be reduced and therefore consumed power can be reduced remarkably. Further, since the machine of the invention employs a bowl which has no projection and recess or opening on the side walls and the peripheral surface and therefore it is simple and smooth in structure, resistance caused by air is reduced and no blower function is recognized. Moreover, since the bowl is fully housed in an airtight housing 25, scattering of flowing air into the environment is completely inhibited, resulting in no occurrence of power loss due to scattering of flowing air.
- Fig. 6 comparatively illustrates characteristics of the centrifugal concentrating machine of the invention (having a bowl diameter of 90 cm, a bowl length of 250 cm to be rotated at 1,000 r.p.m.) and those of the conventional one which is designed in the same dimensions to be rotated at the same number of revolutions particularly in respect of power required for rotation.
- As liquid to be treated excessive activated sludge is used.
- abscissa represents supply rate Q (m 3 /hr) of activated sludge and ordinate shows consumed electric power P (KW).
- reference symbol a represents a characteristic line of the machine of the invention and reference symbol P does that of the conventional machine.
- the machine of the invention consumes an amount of electric power less than that of the conventional one. Further since the machine of the invention has an area of deposition larger than that of the conventional one designed in the same dimensions, a supply rate of liquid to be treated can be increased in proportion to an area of deposition and therefore electric power consumed by the machine of the invention per unit volume of supplied liquid can be reduced correspondingly. Accordingly, it can be concluded that the machine of the invention is designed in the so-called energy saving type.
- the screw decanter type centrifugal concentrating machine of the invention makes it possible to adjust discharge rate of concentrated liquid and residual liquid or concentration of solid material contained in both liquids discharged from the machine during its operation.
- another advantageous feature of the invention is that electric power required for operation of the machine is consumed less than that required forthe conventional one designed in the same dimensions and moreover electric power consumed by the machine of the invention per unit volume of supplied liquid is considerably lower than that of the conventional one.
Landscapes
- Centrifugal Separators (AREA)
Abstract
Description
- The present invention relates to a screw decanter type centrifugal concentrating machine and more particularly to an improved screw decanter type centrifugal concentrating machine for continuously treating so-called suspension containing fine solid particles in liquid with the aid of centrifugal force to separate it into concentrated liquid containing a high content of solid particles and residual liquid containing no solid particle or a very small amount of solid particles.
- A hitherto known screw decanter type centrifugal concentrating machine is generally constructed such that a required number of nozzles of which bore is selectively determined are disposed at the position located in the vicinity of a deposition area at the one end of a bowl where solid particles conveyed by a screw are deposited so as to discharge deposited solid particles through the nozzles which are usually located on a side wall 3 as illustrated in Fig. 1. However, it has been pointed out as drawbacks inherent to the conventional centrifugal concentrating machine that it is possible to change a discharge rate of liquid through nozzles during operation of the machine and moreover carry out immediate adjustment in response to fluctuation in supply rate of suspension, concentration of solid particles or the like and that there is necessity for interrupting operation of the machine at every time when there occurs such a trouble that nozzles are clogged with foreign material. Other drawbacks of the conventional machine are loss in kinematic energy due to discharging of concentrated liquid and residual liquid from the circumference of the bowl, power loss due to blower function and air resistance caused by projections and openings for the arrangement of nozzles and liquid level adjustment during rotation of the bowl and power loss due to scattering of flowing air through openings on the outer casing of the bowl.
- Thus, the present invention has been made with the foregoing drawbacks in mind and its object resides in providing an improved screw decanter type centrifugal concentrating machine which can easily adjust a ratio of flow rate of concentrated liquid to that of residual liquid in response to fluctuation in flow rate of supplied suspension, concentration of solid material or the like during operation of the machine and thereby assure a required concentration of concentrated liquid while consuming a reduced amount of power required for rotating the bowl.
- DE-A-3 317 047 describes a screw decanter type centrifugal concentrating machine in accordance with the prior art portion of claim 1. This is operated by continuously supplying suspension through the one support shaft for the bowl into the interior of the latter while it is rotating, causing solid material in suspension to be deposited on the inner surface of the bowl under the influence of centrifugal force, displacing deposited solid material toward the one end part of the bowl with the aid of a screw conveyor of which the outer diameter is dimensioned appreciably smaller than the inner diameter of the bowl and which is coaxially rotated in the same direction as that of the bowl at a different rotational speed from that of the same, and continuously discharging concentrated liquid and residual liquid through the inner spaces in and about the outer horizontally extending hollow shafts. The present invention, as characterised in claim 1, not only provides for simultaneous control of the discharge rate of both concentrated liquid and residual liquid, but also saves energy by the manner in which inlet liquid to be treated is fed smoothly into the space between the conveyor and the bowl, being accelerated by the guide vanes.
- The accompanying drawings will be briefly described below.
- Figure 1 is a vertical sectional view of a screw decanter type centrifugal concentrating machine in accordance with an embodiment of the invention, shown in the axially shortened state for the purpose of simplification of illustration.
- Fig. 2 is a fragmental cross-sectional view of the centrifugal concentrating machine taken in line II-II in Fig. 1.
- Fig. 3 is a fragmental cross-sectional view of the centrifugal concentrating machine taken in line III-III in Fig. 1.
- Fig. 4 is a fragmental cross-sectional view of the centrifugal concentrating machine taken in line IV-IV in Fig. 1.
- Fig. 5 is a schematic sectional view of the centrifugal concentrating machine illustrating flow lines in the centrifugal concentrating machine of the invention, and
- Fig. 6 is a graph comparatively illustrating performance of both the centrifugal concentrating machine of the invention and the conventional one particularly with respect to electric power consumed for their rotation.
- Now, the present invention will be described in a detail hereunder with reference to the accompanying drawings which illustrate a preferred embodiment of the invention.
- Referring to Fig. 1, a horizontally extending bowl 1 has
side walls 2 and 3 fixedly secured thereto. Each of theside walls 2 and 3 is made integral with a hollow shaft which is horizontally supported by means ofball bearings pulley 6 at its foremost and which is fixedly mounted thereon. Ascrew conveyor 7 includes a cylindrical barrel 9 and a spirally extending blade 8 in the form of a screw is integrally mounted on the barrel 9. As is apparent from the drawing, the outer diameter of the blade 8 is dimensioned appreciably smaller than the inner diameter of the bowl 1. The barrel hashollow shafts side portions 10 and 11. Thehollow shaft 12 is rotatably supported by means ofball bearings 14 firmly fitted into thepulley 6, whereas thehollow shaft 13 is rotatably supported by means ofball bearings 15. Thus, thescrew conveyor 7 is horizontally supported in the coaxial relation relative to the bowl 1 with the aid of both thehollow shafts pulley 6 at a predetermined speed, whereas thescrew conveyor 7 is rotated by thepulley 27 at another predetermined speed lower than that of the bowl 1. - Suspension F to be treated is introduced into the interior of the bowl 1 via an
inlet port 16 attached to the foremost end of thehollow shaft 12 with a sealing member disposed on the latter, thecylindrical space 28 of thehollow shaft 12 and a plurality of radially extendingguide vanes 17 on the inner surface of theside wall 2. Theguide vanes 17 serve to accelerate flowing speed of suspension F to a level correspondng to rotational speed of the bowl 1 whereby turbulence of suspension on the bowl 1 can be minimized. As solid particles in suspension enter the bowl 1, they are caused to be displaced toward the inner surface of the bowl 1 under the influence of centrifugal force produced by rotation of the latter and thereafter they are conveyed toward the side wall 3 with the aid of the screw conveyor. Concentrated liquid S is scooped by a plurality ofscooping tubes 18 or grooves equivalent to thescooping tubes 18 and flows through the tubular space as defined by theaxial extension 29 of the side wall 3 and thehollow shaft 13 so that it is continuously discharged from a concentratedliquid outlet port 21. On the other hand, residual liquid L with no solid particle contained therein is scooped into a plurality of radially extendingpassages 20 on theguide plate 19 and flows through thecylindrical space 30 in thehollow shaft 13 so that it is continuously discharged from a residual liquid outlet port 24 via a residualliquid discharging device 22 disposed at the outermost end of thehollow shaft 13. Arrangement of thescooping tubes 18 and theguide plate 19 made it that way makes it possible to recover kinematic energy carried by concentrated liquid S and residual liquid L in the bowl 1 to be utilized as a part of rotational force required for rotating both the screw conveyor and the bowl. Thedischarging device 22 is provided with a hydraulically operatedthrottle valve 23 of which opening is adjusted such that a volumetric ratio of concentrated liquid to residual liquid, that is, concentration of solid particle in concentrated liquid and residual liquid is maintained within a predetermined range. - Fig. 5 schematically illustrates flowing of liquid and displacement of solid material as described above with reference to Fig. 1. As shown in Fig. 5, a
throttle valve 26 adapted to be adjusted from the outside is disposed at the position located outwardly of the concentratedliquid outlet port 21 in order that concentration and flow rate of concentrated liquid are maintained within a predetermined range. At this moment a flow rate of liquid to be supplied is adjusted in dependence on the adjustment of thethrottle valve 23 as described above. These throttle valves may be designed in the form of automatically controlled valves. By employing automatically controlled valves it is possible to automatically operate the centrifugal concentrating machine of the invention while adjustment is made in dependence on flow rate or concentration of initial liquid prior to separating. - Another advantageous feature of the centrifugal concentrating machine of the invention is that power required for rotating the machine can be reduced.
- In general, power consumed for operating the centrifugal concentrating machine can be expressed by the following equation on the assumption that positional energy and kinematic energy of supplied liquid are neglected.
- As will be readily understood from the above equation, total consumed power is reduced when kinematic energy E1 of concentrated liquid and kinematic energy E2 of residual liquid are kept to a lower level, provided that Q1 and Q2 are constant. Accordingly, kinematic energy of discharged liquid is in proportion to square of peripheral speed as measured at the discharge position. Since the machine of the invention is constructed such that the discharge position is located closer to the axis of rotation than that of the conventional machine, kinematic energy required for the former can be reduced and therefore consumed power can be reduced remarkably. Further, since the machine of the invention employs a bowl which has no projection and recess or opening on the side walls and the peripheral surface and therefore it is simple and smooth in structure, resistance caused by air is reduced and no blower function is recognized. Moreover, since the bowl is fully housed in an
airtight housing 25, scattering of flowing air into the environment is completely inhibited, resulting in no occurrence of power loss due to scattering of flowing air. - Incidentally, Fig. 6 comparatively illustrates characteristics of the centrifugal concentrating machine of the invention (having a bowl diameter of 90 cm, a bowl length of 250 cm to be rotated at 1,000 r.p.m.) and those of the conventional one which is designed in the same dimensions to be rotated at the same number of revolutions particularly in respect of power required for rotation. As liquid to be treated excessive activated sludge is used. In the drawing abscissa represents supply rate Q (m3/hr) of activated sludge and ordinate shows consumed electric power P (KW). In Fig. 6 reference symbol a represents a characteristic line of the machine of the invention and reference symbol P does that of the conventional machine. As is apparent from the drawing, the machine of the invention consumes an amount of electric power less than that of the conventional one. Further since the machine of the invention has an area of deposition larger than that of the conventional one designed in the same dimensions, a supply rate of liquid to be treated can be increased in proportion to an area of deposition and therefore electric power consumed by the machine of the invention per unit volume of supplied liquid can be reduced correspondingly. Accordingly, it can be concluded that the machine of the invention is designed in the so-called energy saving type.
- As described above, the screw decanter type centrifugal concentrating machine of the invention makes it possible to adjust discharge rate of concentrated liquid and residual liquid or concentration of solid material contained in both liquids discharged from the machine during its operation. Further, another advantageous feature of the invention is that electric power required for operation of the machine is consumed less than that required forthe conventional one designed in the same dimensions and moreover electric power consumed by the machine of the invention per unit volume of supplied liquid is considerably lower than that of the conventional one.
Claims (4)
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP84302070A EP0159422B1 (en) | 1984-03-27 | 1984-03-27 | Screw decanter type centrifugal concentrating machine |
DE8484302070T DE3471015D1 (en) | 1984-03-27 | 1984-03-27 | Screw decanter type centrifugal concentrating machine |
AT84302070T ATE34094T1 (en) | 1984-03-27 | 1984-03-27 | SCREW DECANTER TYPE CENTRIFUGAL CONCENTRATION MACHINE. |
ES84531248A ES8503529A1 (en) | 1984-03-27 | 1984-04-03 | Screw decanter type centrifugal concentrating machine. |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP84302070A EP0159422B1 (en) | 1984-03-27 | 1984-03-27 | Screw decanter type centrifugal concentrating machine |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0159422A1 EP0159422A1 (en) | 1985-10-30 |
EP0159422B1 true EP0159422B1 (en) | 1988-05-11 |
Family
ID=8192604
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP84302070A Expired EP0159422B1 (en) | 1984-03-27 | 1984-03-27 | Screw decanter type centrifugal concentrating machine |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0159422B1 (en) |
AT (1) | ATE34094T1 (en) |
DE (1) | DE3471015D1 (en) |
ES (1) | ES8503529A1 (en) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3608664A1 (en) * | 1986-03-14 | 1987-09-17 | Krauss Maffei Ag | FULL-COAT CENTRIFUGE |
DE3638652A1 (en) * | 1986-11-12 | 1988-06-01 | Flottweg Bird Mach Gmbh | Solid-bowl worm centrifuge |
DE3921327A1 (en) * | 1989-06-29 | 1991-01-03 | Kloeckner Humboldt Deutz Ag | WEIR FOR ADJUSTING THE LIQUID LEVEL IN FULL-COAT CENTRIFUGES |
DE4115347C2 (en) * | 1991-05-10 | 1999-07-22 | Baker Hughes De Gmbh | Solid bowl screw centrifuge for classifying a solid-liquid mixture |
DE4231063A1 (en) * | 1992-09-17 | 1994-03-24 | Westfalia Separator Ag | Horizontal decanter centrifuge with partial hydraulic support and reduced re-suspension of solids - by local increased clearance of bowl and screw |
JP2720373B2 (en) * | 1992-12-18 | 1998-03-04 | 月島機械株式会社 | Centrifugal concentrator |
JP2018043211A (en) * | 2016-09-16 | 2018-03-22 | 株式会社クボタ | Centrifugal separator |
EP4272870A1 (en) * | 2022-05-05 | 2023-11-08 | Hermeler, Jürgen | Decanter centrifuge |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE48615C (en) * | CL. Freiherr VON BECHTOLSHEIM in München, Kaulbachstrafse 3 | Innovation in separating centrifuges | ||
EP0085953A2 (en) * | 1982-02-05 | 1983-08-17 | Hitachi, Ltd. | Apparatus for separating solid matters |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DD205825A1 (en) * | 1982-05-28 | 1984-01-11 | Dietrich Eichler | FULL COAT SCREW CENTRIFUGE |
-
1984
- 1984-03-27 AT AT84302070T patent/ATE34094T1/en active
- 1984-03-27 EP EP84302070A patent/EP0159422B1/en not_active Expired
- 1984-03-27 DE DE8484302070T patent/DE3471015D1/en not_active Expired
- 1984-04-03 ES ES84531248A patent/ES8503529A1/en not_active Expired
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE48615C (en) * | CL. Freiherr VON BECHTOLSHEIM in München, Kaulbachstrafse 3 | Innovation in separating centrifuges | ||
EP0085953A2 (en) * | 1982-02-05 | 1983-08-17 | Hitachi, Ltd. | Apparatus for separating solid matters |
Also Published As
Publication number | Publication date |
---|---|
EP0159422A1 (en) | 1985-10-30 |
ES531248A0 (en) | 1985-03-01 |
ATE34094T1 (en) | 1988-05-15 |
ES8503529A1 (en) | 1985-03-01 |
DE3471015D1 (en) | 1988-06-16 |
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