US3499602A - Centrifugal separator - Google Patents

Centrifugal separator Download PDF

Info

Publication number
US3499602A
US3499602A US723742A US3499602DA US3499602A US 3499602 A US3499602 A US 3499602A US 723742 A US723742 A US 723742A US 3499602D A US3499602D A US 3499602DA US 3499602 A US3499602 A US 3499602A
Authority
US
United States
Prior art keywords
rotor
liquid
sludge
conveyor screw
channels
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
US723742A
Other languages
English (en)
Inventor
Carl-Goran Nilson
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.)
Alfa Laval AB
Original Assignee
Alfa Laval AB
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 Alfa Laval AB filed Critical Alfa Laval AB
Application granted granted Critical
Publication of US3499602A publication Critical patent/US3499602A/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

Definitions

  • the present invention relates to centrifugal separators of the type comprising a rotor and a conveyor screw arranged therein for the discharge of sludge, or the like, separated from a liquid supplied to the rotor.
  • the rotor of a centrifugal separator of this type generally comprises a cylindrical section and, connected thereto, a conical section tapering in the feed direction of the conveyor screw.
  • the separator has a pipe or the like which generally opens into the conical section of the rotor.
  • the cylindrical section of the rotor terminates in an end wall having a number of outlets for liquid which has been freed from sludge. These outlets in the end wall of the rotor determine the position of a cylindrical liquid surface formed within the rotor and extending axially from the end wall to a place in the conical section of the rotor.
  • the conveyor screw within the rotor is arranged to be driven at a speed slightly different from the speed at which the rotor is driven, so that sludge settled-at the circumferential wall of the rotor during the separation is fed by the conveyor screw axially, from the cylindrical section of the rotor through the conical section of the same to an outlet at the narrowest end of the conical section.
  • the present invention provides a centrifugal separator of the type described above, which has a considerably higher separating efliciency than previously known separators of this type.
  • the rotor does not necessarily have a conical section but may be entirely cylindrical.
  • the separator is characterized in that the conveyor screw forms with the rotor at least two side-by-side channels therein which extend helically about the rotor axis, of which channels one communicates with the rotor inlet for liquid to be separated, and one communicates with the liquid outlet of the rotor, the channels being interconnected in series so that liquid supplied to the rotor, on its way from the inlet to the liquid outlet, is caused to flow through the different channels, one after the other, while being separated.
  • the helically extending sludge-actuating members of the conveyor screw are formed so that at least one of such channels is confined by these members and the rotor radially outside the liquid surface formed within the rotor during the centrifugal separation.
  • this channel extends radially outside said liquid surface along the whole of itslength, special means are required for the connection of such channel with the rotor inlet for liquid to be separated, which means are arranged to rotate with the conveyor screw.
  • the centrifuge as illustrated comprises generallly a rotor 1 mounted by conventional means (not shown) for rotation about a horizontal central axis, a conveyor screw 2 mounted in the' rotor for rotation relative thereto about the rotor axis, and means 3 for supplying sludgecontaining liquid to the rotor.
  • the rotor 1 comprises a cylindrical section 4 and, connected thereto, a conical section 5 tapering in the feed direction of the conveyor screw 2.
  • the cylindrical section 4 is terminated by an end wall 6 having a number of outlets 7 for liquid supplied to the rotor and which has been freed from sludge or the like by centrifugal separation.
  • the liquid discharging through the outlets 7 is illustrated by arrows 8.
  • the outlets 7 determine the radial position of a cylindrical liquid surface Swhich is formed within the rotor and extends axially from the end wall 6 to a place in the conical rotor section 5.
  • the sludge-actuating member of the conveyor screw 2 is shown, which extends helically around the rotor axis and through the cylindrical as well as the conical section of the rotor, as can be seen from the drawing.
  • the conveyor screw 2 is arranged to feed sludge, settled within the rotor, from the cylindrical rotor section 4 to a number of sludge outlets situated in the narrow end of the conical rotor section 5 and shown collectively at 14. Sludge discharging through outlet 14 is illustrated by arrows 9.
  • Part of the helically extending sludge-actuating member 2 of the conveyor screw is formed with a radially outward opening profile 2a of generally U-shaped crosssection. This part extends from the end wall 6 along the cylindricalrotor wall 4 to the conical rotor section 5.
  • the length of the front leg of the U-profile is gradually decreasing and is no longer existing at the portion of the circumferential rotor wall situated radially inside the liquid surface S formed within the rotor.
  • the conveyor screw 2 has the same form as a conventional conveyor screw for this purpose.
  • the means 3 for supplying liquid to the rotor 1 consists of a first pipe 10 extending axially into the rotor, and a second pipe 11 communicating with the pipe 10 and firmly connected to the conveyor screw 2 so that it rotates with the latter.
  • the pipe 11 opens into a helical channel 12 defined by the rotor wall and the U-profile 2a of the sludge-actuating member 2 of the conveyor screw.
  • the channel 12 extends helically along the cylindrical circumferential wall 4 of the rotor from the end wall 6 to the conical rotor section 5, where the U-profile gradually changes in the manner described above.
  • the helically extending sludge-actuating member 2 of the conveyor screw is situated entirely radially outside the liquid surface S in substantially the whole liquid-containing part of the rotor 1.
  • only such means (not shown) necessary for driving and centering the helically extending member 2 breaks through the liquid surface S.
  • liquid to be separated is supplied to the rotor 1 through the pipes and 11. From the pipe 11 the liquid is led into the channel v12 which is closed by a sludge layer settled on the cylindrical rotor wall, which layer cannot be reached by the conveyor screw 2. Within the channel 12, the liquid is led to the conical section 5 of the rotor while being subjected to a first separating operation. During this first separating operation a portion of the sludge contained by the liquid settles out, this portion forming a bank in front of the rear leg of the U-profile 2a of the sludge-actuating member (reckoned in the feed direction of the conveyor screw).
  • one leg (in this case the front leg) of the U-profile 2a gradually tapers off until it is eliminated, so that the helical channel 12 gradually opens and disappears. Then the sludge already separated from the liquid is fed further by the conveyor screw to the sludge outlet 14, while the liquid is-caused to flow to the outlets 7 in the end wall 6 of the rotor by way of another helical channel 13 separated from the channel 12.
  • the liquid In flowing through the second helical channel 13, the liquid is subjected to a second separating operation which, due to the shape of the conveyor screw 2, does not disturb and is not disturbed by the aforesaid first separating operation, to which new liquid is continually being subjected.
  • Sludge settled out during the second separating operation forms a bank in front of the front leg of the U-profile 2a, which bank .joins the previously mentioned bank (formed in front of the rear leg of the U-profile) in the conical section 5 of the rotor and is then transported further by the conveyor screw to the sludge outlet 14.
  • a liquid supplied to the rotor of a centrifugal separator, constructed as described above, is subjected to a most effective separation. Due to the special shape of the means 3 for the supply of feed to the rotor and the special shape of the conveyor screw 2, the liquid is caused to flow twice through the rotor while subjected to the largest possible centrifugal force. Also, the separation may continue undisturbed at all times, due to the fact that no turbulence arises when new liquid is supplied to the rotor.
  • centrifugal separator is only one embodiment of the present invention, other embodiments being possible without departure from the inventive idea.
  • a centrifugal separator according to the invention instead of having a conveyor screw formed as described above, may have a conventional double-threaded conveyor screw, the helically extending sludge-actuating members of which define together with the rotor two sideby-side helically extending channels communicating with each other and with the inlet and liquid outlet, respectively, of the rotor as previously described.
  • the sludge-actuating members do not necessarily have to be formed so that they, together with the rotor, define one channel situated entirely radially outside the liquid surface S in the rotor.
  • each space between the two threads of the conveyor screw forms a channel which, during the operation of the separator, only partly (i.e., the radially outermost part) contains liquid to be separated.
  • a centrifugal separator comprising a conventionally formed double-threaded conveyor screw
  • all the liquid supplied to the rotor is forced to follow the helically extending sludge-actuating members of the conveyor screw on its way from the inlet pipe 11 to the liquid outlet 7 in the end wall of the rotor, in the longitudinal direction of the channels (corresponding to said channels 12, 13)- defined by the sludge-actuating members.
  • a portion of the liquid to be separated is allowed to fiow transversely in relation to he one channe ie, the ch nn l 13.
  • the necessary-connection between thedifferent channels may be arranged in any suitable manner, as by perforations through the sludge-actuating members or simply by the omission of these members at suitable places. Further, the channel communicating with the rotor inlet may be closed in one direction, in any suitable way, in order to assure that the liquid supplied to the same flows in the right direction.
  • liquid to be separated through three or more channels defined by the conveyor screw and the rotor, which channels communicate with each other and with the rotor inlet and outlet as previously described. If there are more than two channels, certain obvious measures must be taken in order to prevent the channel or channels first passed through by the liquid from being entirely filled with sludge.
  • a conveyor screw mounted in the rotor for con.- tinuously discharging separated sludge through said sludge outlet and defining with the rotor two side-by-side channels extending helically about the rotor axis, one of said channels communicating with said rotor inlet, the other channel communicating with said liquid outlet, said helical channels being interconnected in series whereby liquid supplied to the rotor, in passing from said inlet to said liquid outlet, is caused to flow through the two channels one after the other and in opposite directions, respectively, while being separated from sludge.

Landscapes

  • Centrifugal Separators (AREA)
US723742A 1967-05-09 1968-04-24 Centrifugal separator Expired - Lifetime US3499602A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE644667 1967-05-09

Publications (1)

Publication Number Publication Date
US3499602A true US3499602A (en) 1970-03-10

Family

ID=20268710

Family Applications (1)

Application Number Title Priority Date Filing Date
US723742A Expired - Lifetime US3499602A (en) 1967-05-09 1968-04-24 Centrifugal separator

Country Status (7)

Country Link
US (1) US3499602A (fr)
AT (1) AT279958B (fr)
CH (1) CH467105A (fr)
DE (1) DE1757368C3 (fr)
DK (1) DK120875B (fr)
FR (1) FR1563426A (fr)
GB (1) GB1182753A (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3741465A (en) * 1971-01-20 1973-06-26 Star Cutter Co Centrifugal separator with internal scraper blades
WO1993012886A1 (fr) * 1991-12-31 1993-07-08 Baker Hughes Incorporated Accelerateur d'alimentation comportant une aube d'acceleration
US5651756A (en) * 1991-11-27 1997-07-29 Baker Hughes Inc. Feed accelerator system including feed slurry accelerating nozzle apparatus
US9266122B2 (en) 2009-06-12 2016-02-23 Alfa Laval Corporate Ab Centrifugal separator having a feed accelerator

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2130633C3 (de) * 1971-06-21 1982-09-23 Flottweg-Werk Dr. Georg Bruckmayer GmbH & Co. KG, 8313 Vilsbiburg Vollmantel-Schneckenzentrifuge
DE2228997C2 (de) * 1972-06-14 1986-04-17 Flottweg-Werk Dr. Georg Bruckmayer GmbH & Co. KG, 8313 Vilsbiburg Vollmantel-Schneckenzentrifuge

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US581354A (en) * 1897-04-27 Valentin lapp
US1027134A (en) * 1911-10-23 1912-05-21 Francis J Arend Mechanical movement for producing a differential speed between driving and driven members.
US2528974A (en) * 1945-09-19 1950-11-07 Process Dev Company Method and apparatus for centrifugal separation

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US581354A (en) * 1897-04-27 Valentin lapp
US1027134A (en) * 1911-10-23 1912-05-21 Francis J Arend Mechanical movement for producing a differential speed between driving and driven members.
US2528974A (en) * 1945-09-19 1950-11-07 Process Dev Company Method and apparatus for centrifugal separation

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3741465A (en) * 1971-01-20 1973-06-26 Star Cutter Co Centrifugal separator with internal scraper blades
US5651756A (en) * 1991-11-27 1997-07-29 Baker Hughes Inc. Feed accelerator system including feed slurry accelerating nozzle apparatus
US5658232A (en) * 1991-11-27 1997-08-19 Baker Hughes Inc. Feed accelerator system including feed slurry accelerating nozzle apparatus
WO1993012886A1 (fr) * 1991-12-31 1993-07-08 Baker Hughes Incorporated Accelerateur d'alimentation comportant une aube d'acceleration
US5520605A (en) * 1991-12-31 1996-05-28 Baker Hughes Incorporated Method for accelerating a liquid in a centrifuge
US5551943A (en) * 1991-12-31 1996-09-03 Baker Hughes Incorporated Feed accelerator system including accelerating vane apparatus
US5632714A (en) * 1991-12-31 1997-05-27 Baker Hughes Inc. Feed accelerator system including accelerating vane apparatus
US5840006A (en) * 1991-12-31 1998-11-24 Baker Hughes Incorporated Feed accelerator system including accelerating vane apparatus
US6077210A (en) * 1991-12-31 2000-06-20 Baker Hughes Incorporated Feed accelerator system including accelerating vane apparatus
US9266122B2 (en) 2009-06-12 2016-02-23 Alfa Laval Corporate Ab Centrifugal separator having a feed accelerator

Also Published As

Publication number Publication date
DE1757368A1 (de) 1971-04-08
DE1757368C3 (de) 1979-02-08
CH467105A (de) 1969-01-15
DE1757368B2 (de) 1978-06-15
GB1182753A (en) 1970-03-04
AT279958B (de) 1970-03-25
DK120875B (da) 1971-07-26
FR1563426A (fr) 1969-04-11

Similar Documents

Publication Publication Date Title
US5840006A (en) Feed accelerator system including accelerating vane apparatus
US6290636B1 (en) Helix centrifuge with removable heavy phase discharge nozzles
JPS6018457B2 (ja) 遠心分離機
SE459559B (sv) Kontinuerligt arbetande helkapslad motstroems-centrifugalextraktor
US20180001329A1 (en) Solid Bowl Centrifuge
US4496340A (en) Screw centrifuge with a washing device
US3499602A (en) Centrifugal separator
EP0574364B1 (fr) Centrifugeuse pour la séparation d'huile de suspensions huileuses, travaillant sans addition d'eau potable
US4654022A (en) Rinsing on a solid bowl centrifuge
US5234400A (en) Method and apparatus for the separation, particularly classification of a solids/liquid mixture
CA1311230C (fr) Centrifugeuse-decanteuse, avec dispositif a circulation d'air
EP0068869A2 (fr) Centrifugeuse comportant un disque d'écumage pour l'évacuation d'une phase liquide
US10293346B2 (en) Screw conveyor for a centrifugal separator including partition walls in the helical channel
US5310399A (en) Sedimentation centrifuge containing screw conveyor with fins
US2905379A (en) Solid jacket centrifugal separator
US3430850A (en) Centrifugal separator
EP0423461B1 (fr) Centrifugeuse décanteuse à bol plein
US4915681A (en) Centrifugal separator with continuous discharge
GB2083381A (en) Uniflow decanter centrifuge
US5314399A (en) Sedimentation centrifuge with helical fins mounted on the screw conveyor
EP0528067B1 (fr) Centrifugeur à sédimentation
US2512253A (en) Centrifugal separator
EP0856360B1 (fr) Vis pour séparateur centrifuge de l'huile d'olive
US4085887A (en) Centrifuge for draining off sewage sludge
US4761157A (en) Centrifuge apparatus