CA2072043A1 - Centrifuge gearboxes - Google Patents
Centrifuge gearboxesInfo
- Publication number
- CA2072043A1 CA2072043A1 CA002072043A CA2072043A CA2072043A1 CA 2072043 A1 CA2072043 A1 CA 2072043A1 CA 002072043 A CA002072043 A CA 002072043A CA 2072043 A CA2072043 A CA 2072043A CA 2072043 A1 CA2072043 A1 CA 2072043A1
- Authority
- CA
- Canada
- Prior art keywords
- stage
- bowl
- gear
- carrier
- planet gears
- 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.)
- Abandoned
Links
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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H1/00—Toothed gearings for conveying rotary motion
- F16H1/28—Toothed gearings for conveying rotary motion with gears having orbital motion
- F16H1/46—Systems consisting of a plurality of gear trains each with orbital gears, i.e. systems having three or more central gears
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H3/00—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion
- F16H3/44—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion using gears having orbital motion
- F16H3/46—Gearings having only two central gears, connected by orbital gears
- F16H3/58—Gearings having only two central gears, connected by orbital gears with sets of orbital gears, each consisting of two or more intermeshing orbital gears
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Centrifugal Separators (AREA)
Abstract
ABSTRACT
A gearbox for transmitting drive from the bowl of a decanter centrifuge to its screw conveyor comprises a double epicyclic gear train in which idler gears are inserted in the first stage between the sun and planet gears thereof to reverse the sense of rotation of the carrier which is fast with the sun gear of the second stage, in order that the second stage carrier is rotatable in the same direction as the ring gear and at a higher speed.
A gearbox for transmitting drive from the bowl of a decanter centrifuge to its screw conveyor comprises a double epicyclic gear train in which idler gears are inserted in the first stage between the sun and planet gears thereof to reverse the sense of rotation of the carrier which is fast with the sun gear of the second stage, in order that the second stage carrier is rotatable in the same direction as the ring gear and at a higher speed.
Description
2~72~3 Centrifuqe GeArboxes Thiq lnventlon relates to gearboxes for cen~rifugQs ard ln particular, but not excluslvely decanter centrifuges.
Decanter c~ntrifuges are centrlfugal machines S employed for ~eparating l~rge quantities of particu-late ~olids from liquids. They comprise a bowl whlch 1~ rotated at high ~peed to effect ~eparation, forming an outer l~yer of ~olids against the inner surface of the bowl, and a ~crew conveyor which 1~ rotated relative to the bowl to di3place the solids axlally towards an outlet at one end of the bowl.
, The presQnt invention is concerned with gear-boxes for coupling the screw conveyor of a decanter centrifuge to the bowl to provide the desired relative rotation between the bowl and the conveyor.
`\ It has long been known to employ double \ epicyclic gear bo%es for this purpose, but it has been accepted that this imposes the limitation that the screw conveyor~ will rotate slower than the bowl when the flr3t stage sun gear is statlonary or ls rotated at 1e~s than the bowl speed.
In accordance with a feature of the invention, there is provlded a gearbox for a decanter c-~trifuge, comprising a double eplcyclic gear traln having a fir~t ~tage comprising a sun gear, a rlng gear coupled I ~ 2 - 2072~ ~3 to the bowl for rotat~on therewlth and planet gears mounted on a c~rrier, the second 3tage comprislng a sun gear f ast wlth th~ first stage carrier, a ring geas couplod to the bowl for rotation thereuith, and planet qear~ mountod on a carrier ~hlch i~ coupled to the screw conveyor, ~nd whereln one of the said stages compriso~ idler goar~ whlch couple the sun gear of that stage to the corresponding planet gears.
In the e~bcdl~ent descrlbed below, the idler gears are lncorporated ln the first stage.
With thl~ arr~ngemont, lt ls posslble to drive the screw conveyor at a faster speed than the bowl.
In terms of ~eparatlng efflclency it 18 often advantageous to drlve the conveyor faster than the bo~l, prlmarily to reduce slippage of the solids and llquid~ when the convoyor rotate~ ~l~wer than the bowl. ~owever, lt has not hitherto been possible to achieve this desirable characterlstlc using an epicyclic gearbox.
One form of the decanter centrifuge gearbox will now be described, by way of example only, with >~ reference to the accompanying drawings, in which:
Fig. 1 1~ a diagrammatic axlal cross-section of the gearbox; and Fig. 2 18 an end view illustrating the gearing in the first stage of the gearbox.
The gearbox shown in the drawings comprises a housing 1 having a tubu}ar extension lA fast with the bo~l of a decanter centrifuge. The transmisslon gearing takes the form of a two-stage epicyclic gear train. The first stage comprises a sun ge~r S1 which is held stationary by vlrtue of its spindle 3 being fixed by a torque arm (no~ shown) external cf the housing 1. Two (or more) ldler gear~ Gl mounted on a carrler 4 mesh, on the one hand with the sun gear S1 and on the other h~nd with two (or more) respQc4t~ve planet gear~ P1, al~o mounted on the c~rrier 4. The planet gears mesh with a rlng gear R1 fixed to the housing 1. The hou~ing 1 constitutes the drive input S member and the output member of the first stage tra~n is the carrier 4.
The seco~d stage comprises a sun gear S2 faat wlth the carries and co-axial therewith, planet gear~
P2 mounted on a carrier 6 and a rlng gear R2 fast ~ith the gear box housing. The final drlve or output is a driven shaft 7 fa~t with the carrier 6, fast with the screw conveyor (not shown) of the decanter centri- ~
fuge.
Wlth this arrangement, the screw conveyor i5 coupled to the bowl for rotation in the same direction as the bowl but at a hlgher speed.
According to the operating requ~rements of the centrifuge, the dlfference in speed between the bowl and the conveyor ~crew might typically be in the range of about 1 r.p.m to 80 r.p.m, although higher differ-ential speeds may be provided for in some applications.
Purely by way of example, the gearing in the lllu~trated gear box may be as follows, where "t"
indicates the number of teeth in the indicated gears:
First stage : S1-9t; G1-45t; P1-SOt; R1-135t Second stage: S2-lOt; P2-2at; R2-68~.
In this case the speed of rotation of the conveyor relat~ve to that of the bowl will be 1.009:1 ~more eXactly 110.2:109.2). In absolute terms, if the bowl rotates at a typical operating speed of 3000 r.p.m, the conveyor will rotate at 302' ~p.m. in the same direction.
As described in the foregolng the sun gear S1 of the first stage is held stationary which is usual, _ 4 - 20720~3 but lt i8 also pO88~ ble for the 5un gear Sl to be rotated, uhich has the affect of alterlng the speed ratlo of ~he conveyor relatlve to the bowl. Rotatlng the ~un gear ln tho samo direction a~ tho b~l will S causo the ~peed of the conveyor rolative to the bowl to docrea~o, ~hile rotating the sun goar ln the opposito directlon wlll causQ the ~poed of the conveyor rQlatlve to the bowl to lncr~ase. Usually the ~peed of the ~un genr in any dlrection will not exceed the speed of the bowl, but uhen operatlng in a reverse direction to the bowl, higher ~un gear spQe~s are possible to further increase the ~pe~d of the conveyor relative to th~ boul.
Decanter c~ntrifuges are centrlfugal machines S employed for ~eparating l~rge quantities of particu-late ~olids from liquids. They comprise a bowl whlch 1~ rotated at high ~peed to effect ~eparation, forming an outer l~yer of ~olids against the inner surface of the bowl, and a ~crew conveyor which 1~ rotated relative to the bowl to di3place the solids axlally towards an outlet at one end of the bowl.
, The presQnt invention is concerned with gear-boxes for coupling the screw conveyor of a decanter centrifuge to the bowl to provide the desired relative rotation between the bowl and the conveyor.
`\ It has long been known to employ double \ epicyclic gear bo%es for this purpose, but it has been accepted that this imposes the limitation that the screw conveyor~ will rotate slower than the bowl when the flr3t stage sun gear is statlonary or ls rotated at 1e~s than the bowl speed.
In accordance with a feature of the invention, there is provlded a gearbox for a decanter c-~trifuge, comprising a double eplcyclic gear traln having a fir~t ~tage comprising a sun gear, a rlng gear coupled I ~ 2 - 2072~ ~3 to the bowl for rotat~on therewlth and planet gears mounted on a c~rrier, the second 3tage comprislng a sun gear f ast wlth th~ first stage carrier, a ring geas couplod to the bowl for rotation thereuith, and planet qear~ mountod on a carrier ~hlch i~ coupled to the screw conveyor, ~nd whereln one of the said stages compriso~ idler goar~ whlch couple the sun gear of that stage to the corresponding planet gears.
In the e~bcdl~ent descrlbed below, the idler gears are lncorporated ln the first stage.
With thl~ arr~ngemont, lt ls posslble to drive the screw conveyor at a faster speed than the bowl.
In terms of ~eparatlng efflclency it 18 often advantageous to drlve the conveyor faster than the bo~l, prlmarily to reduce slippage of the solids and llquid~ when the convoyor rotate~ ~l~wer than the bowl. ~owever, lt has not hitherto been possible to achieve this desirable characterlstlc using an epicyclic gearbox.
One form of the decanter centrifuge gearbox will now be described, by way of example only, with >~ reference to the accompanying drawings, in which:
Fig. 1 1~ a diagrammatic axlal cross-section of the gearbox; and Fig. 2 18 an end view illustrating the gearing in the first stage of the gearbox.
The gearbox shown in the drawings comprises a housing 1 having a tubu}ar extension lA fast with the bo~l of a decanter centrifuge. The transmisslon gearing takes the form of a two-stage epicyclic gear train. The first stage comprises a sun ge~r S1 which is held stationary by vlrtue of its spindle 3 being fixed by a torque arm (no~ shown) external cf the housing 1. Two (or more) ldler gear~ Gl mounted on a carrler 4 mesh, on the one hand with the sun gear S1 and on the other h~nd with two (or more) respQc4t~ve planet gear~ P1, al~o mounted on the c~rrier 4. The planet gears mesh with a rlng gear R1 fixed to the housing 1. The hou~ing 1 constitutes the drive input S member and the output member of the first stage tra~n is the carrier 4.
The seco~d stage comprises a sun gear S2 faat wlth the carries and co-axial therewith, planet gear~
P2 mounted on a carrier 6 and a rlng gear R2 fast ~ith the gear box housing. The final drlve or output is a driven shaft 7 fa~t with the carrier 6, fast with the screw conveyor (not shown) of the decanter centri- ~
fuge.
Wlth this arrangement, the screw conveyor i5 coupled to the bowl for rotation in the same direction as the bowl but at a hlgher speed.
According to the operating requ~rements of the centrifuge, the dlfference in speed between the bowl and the conveyor ~crew might typically be in the range of about 1 r.p.m to 80 r.p.m, although higher differ-ential speeds may be provided for in some applications.
Purely by way of example, the gearing in the lllu~trated gear box may be as follows, where "t"
indicates the number of teeth in the indicated gears:
First stage : S1-9t; G1-45t; P1-SOt; R1-135t Second stage: S2-lOt; P2-2at; R2-68~.
In this case the speed of rotation of the conveyor relat~ve to that of the bowl will be 1.009:1 ~more eXactly 110.2:109.2). In absolute terms, if the bowl rotates at a typical operating speed of 3000 r.p.m, the conveyor will rotate at 302' ~p.m. in the same direction.
As described in the foregolng the sun gear S1 of the first stage is held stationary which is usual, _ 4 - 20720~3 but lt i8 also pO88~ ble for the 5un gear Sl to be rotated, uhich has the affect of alterlng the speed ratlo of ~he conveyor relatlve to the bowl. Rotatlng the ~un gear ln tho samo direction a~ tho b~l will S causo the ~peed of the conveyor rolative to the bowl to docrea~o, ~hile rotating the sun goar ln the opposito directlon wlll causQ the ~poed of the conveyor rQlatlve to the bowl to lncr~ase. Usually the ~peed of the ~un genr in any dlrection will not exceed the speed of the bowl, but uhen operatlng in a reverse direction to the bowl, higher ~un gear spQe~s are possible to further increase the ~pe~d of the conveyor relative to th~ boul.
Claims (4)
1. A decanter centrifuge comprising a bowl, a screw conveyor within the bowl and a double epicyclic gear train coupling the bowl and the screw for rotation relative to each other, the said gear train comprising a first stage having a sun gear, a ring gear coupled to the bowl for rotation therewith and planet gears mounted on a carrier, the gear train also comprising a second stage comprising a sun gear fast with the first stage carrier, a ring gear coupled to the bowl for rotation therewith and planet gears mounted on a carrier which is coupled to the screw conveyor, characterised in that one of the said stages further includes intermeshing planet gears which couple the sun gear of their stage to the corresponding planet gears.
2. A gearbox according to claim 1, wherein the said idler gears are incorporated in the first stage of the epicyclic train.
3. A gearbox according to claim 1 or 2, wherein said first stage idler gear is rotatable with respect to ground.
4. A gearbox according to claim 1, 2 or 3 wherein the speed of the first stage idler gear is controlled to alter the relative speed of the second stage carrier to that of the ring gear.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9000343A GB2239924B (en) | 1990-01-08 | 1990-01-08 | Centrifuge gearboxes |
| PCT/GB1991/000012 WO1991010846A1 (en) | 1990-01-08 | 1991-01-04 | Centrifuge gearboxes |
| JP3502467A JPH05502928A (en) | 1990-01-08 | 1991-01-04 | gearbox for centrifuge |
| EP91902231A EP0510053A1 (en) | 1990-01-08 | 1991-01-04 | Decanter centrifuge gearboxes |
| CA002072043A CA2072043A1 (en) | 1990-01-08 | 1992-06-23 | Centrifuge gearboxes |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9000343A GB2239924B (en) | 1990-01-08 | 1990-01-08 | Centrifuge gearboxes |
| CA002072043A CA2072043A1 (en) | 1990-01-08 | 1992-06-23 | Centrifuge gearboxes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2072043A1 true CA2072043A1 (en) | 1993-12-24 |
Family
ID=25675258
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002072043A Abandoned CA2072043A1 (en) | 1990-01-08 | 1992-06-23 | Centrifuge gearboxes |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0510053A1 (en) |
| JP (1) | JPH05502928A (en) |
| CA (1) | CA2072043A1 (en) |
| GB (1) | GB2239924B (en) |
| WO (1) | WO1991010846A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4040015A1 (en) * | 2021-02-09 | 2022-08-10 | Alfredo Tampieri | Compact epicyclic gearing |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4310158C1 (en) * | 1993-03-29 | 1994-12-22 | Braren Cyclo Getriebe | Orbital gearbox with two output shafts |
| WO2002081094A1 (en) | 2001-04-04 | 2002-10-17 | Centriquip Limited | A gearbox for a centrifuge, such as a decanter centrifuge |
| DE102006028804A1 (en) * | 2006-06-23 | 2007-12-27 | Westfalia Separator Ag | Slug centrifuge with drive device |
| CN100453847C (en) * | 2006-12-01 | 2009-01-21 | 洛阳聚翔机械科技有限公司 | Countershaft planetary transmission backing device for tractor |
| WO2008078396A1 (en) * | 2006-12-26 | 2008-07-03 | Tomoe Engineering Co., Ltd. | Gear box for centrifugal separator |
| CN103438162B (en) * | 2013-08-13 | 2017-02-08 | 柳州博泽科技有限公司 | Double-planetary gearbox |
| JP2017088091A (en) * | 2015-11-16 | 2017-05-25 | 株式会社シマノ | Drive unit for bicycle |
| WO2020182163A1 (en) * | 2019-03-12 | 2020-09-17 | 熊建文 | Bidirectional overrunning clutch and two-speed transmission |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3187997A (en) * | 1962-02-12 | 1965-06-08 | Ametek Inc | Horizontal type centrifugal separator |
| US3359833A (en) * | 1964-11-25 | 1967-12-26 | Borg Warner | Transmission controls |
| FR2610058A1 (en) * | 1987-01-26 | 1988-07-29 | Maag France | Power transmission device with speed reduction between a rotating assembly and a shaft mounted coaxially inside the latter |
| US4825723A (en) * | 1987-09-04 | 1989-05-02 | Allied-Signal Inc. | Compound planetary gear assembly |
-
1990
- 1990-01-08 GB GB9000343A patent/GB2239924B/en not_active Expired - Fee Related
-
1991
- 1991-01-04 JP JP3502467A patent/JPH05502928A/en active Pending
- 1991-01-04 EP EP91902231A patent/EP0510053A1/en not_active Ceased
- 1991-01-04 WO PCT/GB1991/000012 patent/WO1991010846A1/en not_active Application Discontinuation
-
1992
- 1992-06-23 CA CA002072043A patent/CA2072043A1/en not_active Abandoned
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4040015A1 (en) * | 2021-02-09 | 2022-08-10 | Alfredo Tampieri | Compact epicyclic gearing |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2239924A (en) | 1991-07-17 |
| WO1991010846A1 (en) | 1991-07-25 |
| EP0510053A1 (en) | 1992-10-28 |
| GB9000343D0 (en) | 1990-03-07 |
| GB2239924B (en) | 1993-06-30 |
| JPH05502928A (en) | 1993-05-20 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |