US3734399A - Differential scroll drive - Google Patents

Differential scroll drive Download PDF

Info

Publication number
US3734399A
US3734399A US00147796A US3734399DA US3734399A US 3734399 A US3734399 A US 3734399A US 00147796 A US00147796 A US 00147796A US 3734399D A US3734399D A US 3734399DA US 3734399 A US3734399 A US 3734399A
Authority
US
United States
Prior art keywords
bowl
solids
speed
liquids
scroll
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
Application number
US00147796A
Other languages
English (en)
Inventor
D Oas
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Beloit Corp
Original Assignee
Beloit Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Beloit Corp filed Critical Beloit Corp
Application granted granted Critical
Publication of US3734399A publication Critical patent/US3734399A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • B04B1/2016—Driving control or mechanisms; Arrangement of transmission gearing
    • 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
    • B04B1/2016—Driving control or mechanisms; Arrangement of transmission gearing
    • B04B2001/2025—Driving control or mechanisms; Arrangement of transmission gearing with drive comprising a planetary gear

Definitions

  • ABSTRACT A driven centrifuge mechanism for separating intermixed liquids and solids including a hollow bowl supported for rotation about an axis with a smaller inner diameter at one end and a larger at the other end and a helical conveyor scroll extending through the center for moving solids to a solids opening at one end of the bowl and a liquid opening at the other end of the bowl and a drive at one end of the bowl connected to the bowl and to the scroll for driving the bowl off a main drive motor at a constant speed and for varying the speed of the scroll relative thereto with the main drive motor driving a hydraulic pump which drives a hydraulic motor and through a differential gear means drives the scroll with the speed between the hydraulic pump and motor variable so as to be able to control the speed of the scroll.
  • the invention relates to a centrifuge mechanism for separating solids and liquids from a mixture and controlling the speed of the separator for optimum separation.
  • Centrifuge separators of this type have been employed in various industries and operate with a mechanism wherein a solid or perforated bowl centrifuge rotates at an optimum separation speed and has an axial screw conveyor or scroll extending coaxially therethrough.
  • the screw conveyor functions to move the solids toward one end of the bowl for a discharge and liquids are discharged at the other end.
  • An unseparated mixture of liquids and solids is supplied to the bowl coaxially through the conveyor to be fet at the processing speed of the conveyor. Control of the speed of the feed may be provided and an important factor is the speed of the scroll. With variant consistencies of the mixture and varying speeds of separation within the bowl, the speed of the screw conveyor must be controllable independent of the bowl speed.
  • a still further object of the invention is to provide an improved centrifugal separator and drive which effects a saving in power consumption, space and cost for devices heretofore available.
  • FIG. 1 is a somewhat schematic side elevational view, taken partially in section, of a structure constructed and operating in accordance with the principles of the present invention.
  • FIG. 2 is a schematic showing of a portion of the drive mechanism.
  • the separator includes an elongate cylindrically shaped imperforate bowl 10 which is driven by shaft 41 and is supported for rotation about a central axis on end bearings 14 and 15.
  • a casing 11 Surrounding the bowl is a casing 11 which is provided with a solids discharge outlet 12 at one end and a liquid discharge outlet 13 at the other end, and these outlets are lead from solids discharge ports 12a at one end of the bowl l0 and liquid discharge ports 13a at the other end of the bowl.
  • the bowl is driven in rotation for centrigugal separation of liquids and solids from a mixture fed therein.
  • a rotating conveyor scroll l9 having helical lands thereon for moving the solids toward the solids discharge ports 12a.
  • the scroll 19 rotates coaxial with the bowl 10, but at a slightly slower speed being supported the shaft 18 supported on one end on bearing 24 and on the other end on a bearing not shown.
  • a mixture of liquids and solids is supplied in a continual flow to the bowl through an inlet line 20 which feed axially inwardly past a feed control valve 22 within the scroll and the mixture passes radially outwardly through feed ports 21 in the scroll body.
  • the bowl is driven directly by a main drive motor 27 through suitable means such as V-pulleys and belts 26.
  • a fluid coupling 28 may be provided within the main drive motor, and the V-belt drive.
  • a variable speed drive means perferably in the form of a planetary gear reducer 29 is provided.
  • the gear reducer, and its associated mechanism, are driven off of the same main drive motor so that only a single main source of power need be provided.
  • the gear reducer in a preferred form embodies a planetary gearing with an output shaft 39 and a first input shaft 41 and a second input shaft 43.
  • the planetary gears 32 are connected to the output shaft 39, and the first input shaft is connected to the sun gear 31, and the second input shaft 43 is connected to the sun gear 33.
  • the planetary gearing is driven through the input shaft 41 from the main drive motor 27. Control of the speed is attained through the second input shaft 43 which is driven by a hydraulic motor 34.
  • the hydraulic motor is operated from a hydraulic pump 35 and connector lines 36 extend between the pump and motor. The pump is driven also by the main drive motor 27.
  • the hydraulic pump 35 and hydraulic motor 34 are variable positive displacement types with the displacement of the pump and motor controlled by control members. Therefore, the pump may operate at a constant speed as driven by the motor 27, and the hydraulic motor 34 will operate at a speed determined by the setting of the displacement of the hydraulic pump 35.
  • On the pump 35 or in the hydraulic lines 36 is a valve 37 which operates to reverse the lines so that the flow between the pump and motor can be set for operation in mode I or mode II.
  • mode I the sun gear member 33 is allowed to rotate in the same direction as the centrifuge bowl.
  • the differential speed which is the speed of the bowl minus the speed of the scroll, is determined from the equation:
  • Gear reducer ratio The hydraulic drive is normally functioning in mode I as a retarder and power flow is such that the fixed displacement hydraulic motor is actually performing as a pump, and the variable displacement pump operates as a motor. This accomplishes energy recovery by hydraulic transmission from the sun gear back to the main drive motor.
  • the hydraulic drive may also function as a drive, wherein the hydraulic motor performs as a motor and the hydraulic pump performs as a pump.
  • Gear reducer ratio In this mode the hydraulic drive functions as a drive, and the output of the hydraulic pump drives the hydraulic motor.
  • the reduction ratio of the planetary gear reducer will be chosen as optimum relative to the required speed of the scroll relative to the bowl.
  • the scroll may operate at a differential speed of 16 RPM (absolute speed of 3,784 RPM) while the bowl operates at 3,800 RPM, and the speed of the scroll may be adjusted upwardly or downwardly in accordance with the wetting of the hydraulic pump.
  • a pressure valve 38 is connected to the lines 36 to indicate fluid pressure and hence indicate the scroll drive torque.
  • the valve 38 may be provided with an overload protection arrangement to prevent damages to drive mechanism, which limits torque on reducer 29, allows motor 34 to free wheel or which shuts down the entire mechanism at maximum torque.
  • the pressure valve 38 is connected to the feed control valve supplying the mixture of solids and liquids to the separator.
  • a driven centrifuge mechanism for separating inter-mixed liquids and solids comprising in combination,
  • a hollow bowl supported for rotation about an axis and having its inner diameter decreasing toward one end with a solids opening at said one end and a liquids opening at the other end,
  • a helical conveyor scroll coaxial within the bowl supported for rotation at a controlled speed different than the bowl for moving solids within said bowl toward the solids opening
  • a feed means within the bowl for supplying a mixture of liquids and solids to the bowl
  • a differential gear drive means having an output shaft connected to the scroll and having first and second input shafts, said first input shaft connected to the bowl,
  • a hydraulic pump driven by said motor means and having an output
  • a hydraulic motor connected by fluid lines to the output of the hydraulic pump for being driven thereby and drivingly connected to the second input shaft of said gear drive means
  • a driven centrifuge mechanism for separating intermixed liquids and solids constructed in accordance with claim 1 wherein said pump is a positive displacement pump and with controlling means, varies the fluid direction and output of the pump relative to its driven speed.
  • a driven centrifuge mechanism for separating intermixed liquids and solids constructed in accordance with claim 1 wherein said differential gear drive means is a planetary gearing having sun gears.
  • a driven centrifuge mechanism for separating intermixed liquids and solids constructed in accordance with claim 3 wherein the sun gears are connected to the first and second input shafts respectively.
  • a driven centrifuge mechanism for separating intermixed liquids and solids constructed in accordance with claim 1 and including a liquid coupling between the motor means and said first input shaft.
  • a driven centrifuge mechanism for separating intermixed liquids and solids constructed in accordance with claim 1 and including a pressure sensing valve connected to the output of the hydraulic pump.
  • a driven centrifuge mechanism for separating intermixed liquids and solids constructed in accordance with claim 6 including a feed control valve connected to said feed means and connected to said pressure sensing valve and operated as a function of the pump pressure output to regulate the feed to the bowl.
  • a driven centrifuge mechanism for separating intermixed liquids and solids comprising in combination,
  • a hollow bowl supported for rotation about an axis and having its inner diameter decreasing toward one end with a solids opening and a liquids opening,
  • a helical conveyor scroll coaxial within the bowl supported for rotation at a controlled speed different than the bowl for moving solids within said bowl toward the solids opening
  • a feed means within the bowl for supplying a mixture of liquids and solids to the bowl
  • variable speed output drive means having an output shaft connected to the scroll and having first and second input shafts
  • a driven centrifuge mechanism for separating intermixed liquids and solids constructed in accordance with claim 1 wherein the controlling means includes a control valve means for controlling flow direction.

Landscapes

  • Centrifugal Separators (AREA)
US00147796A 1971-05-28 1971-05-28 Differential scroll drive Expired - Lifetime US3734399A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US14779671A 1971-05-28 1971-05-28

Publications (1)

Publication Number Publication Date
US3734399A true US3734399A (en) 1973-05-22

Family

ID=22522932

Family Applications (1)

Application Number Title Priority Date Filing Date
US00147796A Expired - Lifetime US3734399A (en) 1971-05-28 1971-05-28 Differential scroll drive

Country Status (5)

Country Link
US (1) US3734399A (enrdf_load_stackoverflow)
CA (1) CA949044A (enrdf_load_stackoverflow)
FR (1) FR2140143A1 (enrdf_load_stackoverflow)
GB (1) GB1395044A (enrdf_load_stackoverflow)
IT (1) IT955781B (enrdf_load_stackoverflow)

Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3857783A (en) * 1973-03-30 1974-12-31 Shin Nippon Machinery Co Ltd Suspended type centrifugal separator
US3923241A (en) * 1973-07-21 1975-12-02 Cyphelly Ivan J Decanting centrifuge
JPS52146771U (enrdf_load_stackoverflow) * 1976-05-04 1977-11-07
US4073431A (en) * 1975-11-18 1978-02-14 Flottweg-Werk Dr. Georg Bruckmayer Gmbh & Co. Kg Solid jacket worm centrifuge with rpm differential variable coupling between jacket part and worm part
US4085888A (en) * 1975-11-18 1978-04-25 Flottweg-Werk Dr. Georg Bruckmayer Gmbh & Co. Kg Process and apparatus for the treatment of suspensions
US4113171A (en) * 1976-04-14 1978-09-12 Cyphelly Ivan J Valve arrangement for limiting torque of a hydraulic motor of a centrifuge
US4120447A (en) * 1975-10-23 1978-10-17 Flottweg-Werk Dr. Georg Bruckmayer Gmbh & Co. Kg Pressure-tight solid bowl screw centrifuge
US4141488A (en) * 1977-08-18 1979-02-27 Koninklijke Nederlandse Papierfabrieken N.W. Centrifuge
US4228949A (en) * 1977-10-04 1980-10-21 Thomas Broadbent & Sons Limited Solid bowl scroll discharge decanter centrifuges
US4240578A (en) * 1977-05-04 1980-12-23 Jackson Joseph F Solid bowl decanter centrifuges of the scroll discharge type
US4298162A (en) * 1979-02-23 1981-11-03 Alfa-Laval Separation A/S Decanter centrifuge
DE3116749A1 (de) * 1980-05-16 1982-02-25 Ivan Jaroslav Dipl.-Ing. 8128 Hinteregg Cyphelly Dekanterzentrifuge mit hydraulischem differenzantrieb
US4327862A (en) * 1978-11-15 1982-05-04 Klockner-Humboldt-Deutz Ag Worm centrifuge
US4369915A (en) * 1980-02-15 1983-01-25 Klockner-Humboldt-Deutz Ag Method and apparatus for regulating the differential rpm of two rotating parts
US4381849A (en) * 1981-06-29 1983-05-03 Bird Machine Company, Inc. Solids-liquid slurry separating centrifuge
US4978331A (en) * 1989-07-11 1990-12-18 Alfa-Laval Ab Method and apparatus for cleaning in place of a decanter centrifuge
US5342279A (en) * 1992-08-18 1994-08-30 Alfa Laval Separation Inc. Decanter centrifuge having dual motor drive
US5344570A (en) * 1993-01-14 1994-09-06 James E. McLachlan Method and apparatus for removing solids from a liquid
US5403260A (en) * 1993-06-04 1995-04-04 Hutchinson-Hayes International Automatic frequency controlled motor backdrive
US5681256A (en) * 1994-11-10 1997-10-28 Nkk Corporation Screw decanter centrifuge having a speed-torque controller
US6387032B1 (en) * 1998-02-17 2002-05-14 Westfalia Separator Ag Screw-type solid bowl centrifuge with multistage planetary gear train
US20040138040A1 (en) * 2003-01-15 2004-07-15 Hensley Gary L. Decanter centrifuge control
US20070296281A1 (en) * 2006-06-07 2007-12-27 Husky Injection Molding Systems Ltd. Electrical motor
CN100462571C (zh) * 2005-01-18 2009-02-18 上海市离心机械研究所有限公司 一种用于卧螺离心机成套系统的双泵驱动液压站
US20110034313A1 (en) * 2009-08-06 2011-02-10 Andritz Separation Inc. Centrifuge with hydraulic drive unit
DE102011108008A1 (de) 2011-07-19 2013-01-24 Harry Gaus Dekanterzentrifuge
US8808154B2 (en) * 2010-09-13 2014-08-19 Hiller Gmbh Drive apparatus in a scroll centrifuge having a gearbox with a housing nonrotatably connected to a drive shaft

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7609294A (nl) * 1976-08-20 1978-02-22 Koninklijke Papierfab Nv Centrifugeregeling.
JPS5610353A (en) * 1979-07-05 1981-02-02 Suguru Katsume Completely-enclosed type screw-carrying centrifugal separator
DK166996B1 (da) * 1988-06-21 1993-08-16 Alfa Laval Separation As Dekantercentrifuge

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3126337A (en) * 1964-03-24 System for separating and classifying solids

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3126337A (en) * 1964-03-24 System for separating and classifying solids

Cited By (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3857783A (en) * 1973-03-30 1974-12-31 Shin Nippon Machinery Co Ltd Suspended type centrifugal separator
US3923241A (en) * 1973-07-21 1975-12-02 Cyphelly Ivan J Decanting centrifuge
US4120447A (en) * 1975-10-23 1978-10-17 Flottweg-Werk Dr. Georg Bruckmayer Gmbh & Co. Kg Pressure-tight solid bowl screw centrifuge
DK154476B (da) * 1975-11-18 1988-11-21 Flottweg Werk Bruckmayer Fremgangsmaade til kontinuerlig adskillelse af suspensioner af faste stoffer, som er tilboejelige til at bloedgoeres under paavirkning af tryk og/eller temperatur og under anvendelse af en fuldkappesneglecentrifuge
US4073431A (en) * 1975-11-18 1978-02-14 Flottweg-Werk Dr. Georg Bruckmayer Gmbh & Co. Kg Solid jacket worm centrifuge with rpm differential variable coupling between jacket part and worm part
US4085888A (en) * 1975-11-18 1978-04-25 Flottweg-Werk Dr. Georg Bruckmayer Gmbh & Co. Kg Process and apparatus for the treatment of suspensions
US4113171A (en) * 1976-04-14 1978-09-12 Cyphelly Ivan J Valve arrangement for limiting torque of a hydraulic motor of a centrifuge
JPS52146771U (enrdf_load_stackoverflow) * 1976-05-04 1977-11-07
US4240578A (en) * 1977-05-04 1980-12-23 Jackson Joseph F Solid bowl decanter centrifuges of the scroll discharge type
US4141488A (en) * 1977-08-18 1979-02-27 Koninklijke Nederlandse Papierfabrieken N.W. Centrifuge
US4228949A (en) * 1977-10-04 1980-10-21 Thomas Broadbent & Sons Limited Solid bowl scroll discharge decanter centrifuges
US4327862A (en) * 1978-11-15 1982-05-04 Klockner-Humboldt-Deutz Ag Worm centrifuge
US4298162A (en) * 1979-02-23 1981-11-03 Alfa-Laval Separation A/S Decanter centrifuge
US4369915A (en) * 1980-02-15 1983-01-25 Klockner-Humboldt-Deutz Ag Method and apparatus for regulating the differential rpm of two rotating parts
DE3116749A1 (de) * 1980-05-16 1982-02-25 Ivan Jaroslav Dipl.-Ing. 8128 Hinteregg Cyphelly Dekanterzentrifuge mit hydraulischem differenzantrieb
US4411646A (en) * 1980-05-16 1983-10-25 Cyphelly Ivan J Decanter centrifuge having differential drive unit
US4381849A (en) * 1981-06-29 1983-05-03 Bird Machine Company, Inc. Solids-liquid slurry separating centrifuge
US4978331A (en) * 1989-07-11 1990-12-18 Alfa-Laval Ab Method and apparatus for cleaning in place of a decanter centrifuge
US5342279A (en) * 1992-08-18 1994-08-30 Alfa Laval Separation Inc. Decanter centrifuge having dual motor drive
US5494584A (en) * 1993-01-14 1996-02-27 James E. McLachlan Method and apparatus for controlling a pump upstream of a centrifuge
US5344570A (en) * 1993-01-14 1994-09-06 James E. McLachlan Method and apparatus for removing solids from a liquid
US5403260A (en) * 1993-06-04 1995-04-04 Hutchinson-Hayes International Automatic frequency controlled motor backdrive
US5681256A (en) * 1994-11-10 1997-10-28 Nkk Corporation Screw decanter centrifuge having a speed-torque controller
US6387032B1 (en) * 1998-02-17 2002-05-14 Westfalia Separator Ag Screw-type solid bowl centrifuge with multistage planetary gear train
US20040138040A1 (en) * 2003-01-15 2004-07-15 Hensley Gary L. Decanter centrifuge control
CN100462571C (zh) * 2005-01-18 2009-02-18 上海市离心机械研究所有限公司 一种用于卧螺离心机成套系统的双泵驱动液压站
US20070296281A1 (en) * 2006-06-07 2007-12-27 Husky Injection Molding Systems Ltd. Electrical motor
US20110034313A1 (en) * 2009-08-06 2011-02-10 Andritz Separation Inc. Centrifuge with hydraulic drive unit
US8808154B2 (en) * 2010-09-13 2014-08-19 Hiller Gmbh Drive apparatus in a scroll centrifuge having a gearbox with a housing nonrotatably connected to a drive shaft
DE102011108008A1 (de) 2011-07-19 2013-01-24 Harry Gaus Dekanterzentrifuge
WO2013010667A1 (de) 2011-07-19 2013-01-24 Harry Gaus Dekanterzentrifuge
DE202012012743U1 (de) 2011-07-19 2013-10-10 Harry Gaus Dekanterzentrifuge

Also Published As

Publication number Publication date
CA949044A (en) 1974-06-11
FR2140143A1 (enrdf_load_stackoverflow) 1973-01-12
IT955781B (it) 1973-09-29
GB1395044A (en) 1975-05-21

Similar Documents

Publication Publication Date Title
US3734399A (en) Differential scroll drive
US4299353A (en) Drive for a continuously operating screw ejection centrifugal separator
US4298162A (en) Decanter centrifuge
US5772573A (en) Decanter centrifuge and gear box with harmonic drive and associated operating method
US2703676A (en) Solids discharge mechanism for centrifuges
US5403260A (en) Automatic frequency controlled motor backdrive
KR101663827B1 (ko) 멀티 스크류가 장착된 수평형 원심분리 농축 탈수기
US6071378A (en) Method and device for treating a pulp suspension
JPS59206062A (ja) 固体ボウル遠心分離機
US4421502A (en) Worm centrifuge
US1921296A (en) Filter
US4494942A (en) Continuously variable V-belt transmission
US2462098A (en) Continuous centrifugal machine
US3172851A (en) Centrifuging liquid-solids mixtures
GB2064997A (en) Screen bowl decanter centrifuges
US2649816A (en) Transmission and reaction torque device
US3343786A (en) Centrifuge having plural conveying means for solids
US4129249A (en) Centrifuge for separating solids and liquids
US6155964A (en) Centrifuge drive system providing optimum performance
US2670131A (en) Centrifuge with interstage washing
US3148145A (en) Solids discharge centrifuge
CN107081223A (zh) 一种流体高速分离的卧式螺旋自动卸料沉降离心机
KR100251596B1 (ko) 원심력에 의한 기계농축과 탈수기
GB899310A (en) Solid-bowl centrifuge with discharge screw
US6139685A (en) Method and device for treating a pulp suspension