US3860165A - Centrifuge and method of operating the same - Google Patents

Centrifuge and method of operating the same Download PDF

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Publication number
US3860165A
US3860165A US397098A US39709873A US3860165A US 3860165 A US3860165 A US 3860165A US 397098 A US397098 A US 397098A US 39709873 A US39709873 A US 39709873A US 3860165 A US3860165 A US 3860165A
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US
United States
Prior art keywords
basket
electromotor
centrifuge
air
centrifuged
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
US397098A
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English (en)
Inventor
Bernhard Fiedler
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.)
BWS Technologie GmbH
Original Assignee
Maschinenfabrik Buckau R Wolf AG
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 Maschinenfabrik Buckau R Wolf AG filed Critical Maschinenfabrik Buckau R Wolf AG
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B9/00—Drives specially designed for centrifuges; Arrangement or disposition of transmission gearing; Suspending or balancing rotary bowls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B15/00—Other accessories for centrifuges
    • B04B15/02—Other accessories for centrifuges for cooling, heating, or heat insulating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B15/00—Other accessories for centrifuges
    • B04B15/12—Other accessories for centrifuges for drying or washing the separated solid particles

Definitions

  • the electromotor has [51] Int.
  • the present invention relates generally to centrifuging, and more particularly to a novel centrifuge and to a method of operating the same.
  • the present invention relates. to a continuously operating sugar centrifuge, and a method of operating the same.
  • the prior art has proposed to overcome the problem by heating the syrup to a temperature higher than that required to obtain its desired viscosity while it is in the centrifuge basket, in the hope that the cooling which takes place during centrifuging will reduce the temperatue of the molasses only to the normal desired temperature, so that the viscosity of the syrup will not increase beyond that desired for centrifuging purposes.
  • this requires very large containers with heated rotating stirring mechanisms. A relatively long period of time is required for the contents of such a container to be heated to the desired temperature.
  • an object of the present invention to provide an improved centrifuge, particularly a sugar centrifuge, which overcomes the aforementioned disadvantages and is capable of maintaining the material to be centrifuge at a desired temperature.
  • Another object of the invention is to provide such an improved centrifuge which is relatively simple in its construction.
  • An additional object of the invention is to provide a method of operating the novel centrifuge.
  • a centrifuge particularly a sugar centrifuge, which comprises an upright centrifuge basket having a lower end and an upwardly divering interior cross-section.
  • An accelerator member is connected to the basket in the region of the lower end for accelerating material being centrifuged.
  • An electromotor is at least in part above the basket and has an output shaft extending into the same and being connected with the accelerator member for rotating the basket.
  • the electromotor has cooling fins and is surrounded by an airguide sleeve which has a lower open end in region of the accelerator member, so that air which is heated by contact with the electromotor for the purpose of cooling the same is directed by the sleeve onto the material being centrifuged in the basket.
  • the material to be centrifuged moves continuously at high speed and in form of a very thin film or layer over the inner surface bounding the interior of the drum or basket, towards the upper open outlet end of the basket.
  • the air'guided by the sleeve is directed against this thin layer and is fully sufficient to prevent cooling of the material and to maintain it at sufficiently low viscosity so that it can be properly centrifuged.
  • the electromotors used for driving the baskets of sugar centrifuges are air-cooled. They utilize their own impeller which draws -in cold air and makes it circulate past the cooling fins of the motor, whereby the air is heated through heat exchange with the cooling fins. This air is then vented and the heat energy which it has picked up from the cooling fins, is lost.
  • the present invention recovers this heat energy, utilizing it to maintain the material to be centrifuged at the desired temperature at which it can be properly centrifuged.
  • the present invention in using the heretofore lost heat energy, eliminates the necessity for an additional heater which would otherwise be required to preheat air to be directed against the material to be centrifuged.
  • the construction of the centrifuge is less complicated and, moreover, it is less expensive.
  • the operating costs of the centrifuge are reduced because the desired warming of the material being centrifuged is achieved without requiring the expenditure of additional energy, utilizing the heretofore lost thermal energy dissipated from the electromotor.
  • FIGURE is a somewhat diagrammatic vertical section through one embodiment of the invention.
  • reference numeral 1 identifies a closed housing having an upper open end which is closed by the cover 18.
  • a centrifuge basket 2 the interior cross-section of which diverges from its lower end towards its upper end, has at the lower end a hub 3 on which a conical accelerator member is mounted by means of accelerating spokes 6.
  • the basket 2 is suspended from a downwardly extending output shaft 4 of an electromotor 7, whighputputshaftiis connected with the accelerator member 5 and the hub 3.
  • the outer circumference of the motor 7 is provided with cooling ribs 14 which are surrounded by a cylindrical air-guide sleeve 13 defining with the ribs 14 air guide channels 15.
  • the opposite ends of the sleeve 13 are open so that air which is drawn in through the inlet opening 9 by the blades 8 of the impeller associated with the motor for cooling the same, can pass through the channels 15 in heat exchanging contact with the ribs or fins 14, in downward direction. This of course cools the motor 7 in the usual manner.
  • the cooling air becomes heated as it exchanges heat with the cooling fins 14.
  • the thus heated air issues from the lower open air of the sleeve, which is located in the region of the accelerator member 5.
  • the lower end portion of the sleeve 13 conically converges, advantageously to an outer diameter which is no greater than the minimum inner diameter of the accelerator member 5.
  • the amount of cooling air which can be drawn into contact with the fins 14 by the blades 8, can be controlled by a control member, for instance a slide which can close the opening 9 to a greater or leser extent. This of course controls the amount of cooling air, and thereby the temperature of the air issuing into the interior of the basket 2 can be varied.
  • the material to be centrifuged that is for instance syrup, is admitted via inlet 17 into the region of the accelerator member 5.
  • Rotation of the basket 2 causes the material to flow towards the upper open end of the basket over the inner circumferential surface thereof, in a thin layer.
  • the basket 2 has not been shown as having openings, and although no inner screen has been illustrated in contact with the inner circumferential surface of the basket, this has been done only for ease of illustration. It should be understood that these will selfevidently be present. In fact, the construction of the basket 2 is completely conventional in the sugar centrifuging art.
  • the motor 7 is provided with a lower journal 19 and an upper journal 20, and extends so into the interior of the basket 2 that the lower journal 19 is located approximately at the level of the center of gravity of the basket 2.
  • the cooling air which is admitted through the opening 9 is heated by contact with the cooling fins 14 to such an extent that, when it is blown against the layer of material to be centrifuged, it will maintain the temperature of the material at such a level that the material retains the degree of viscosity necessary for proper centrifuging.
  • a further advantage of this construction is that the overall centrifuge height can be substantially lower than would otherwise be possible, which is an advantage in terms of saving valuable space. Moreover, the centrifuge will operate more quietly, especially due to the fact that the motor 7 is mounted on the cover 18 of the housing 1 and extends into the interior of the basket 2 to such an extent its lower journal 19 is located at or near the center of gravity of the basket 2.
  • the arrangement of the member 5, and the provision of the elements 6 thereof assures that the accelerator member 5 will not only draw the newly admitted material to be centrifuged, but also the warm air which issues from the sleeve 13, and will guide them jointly at the lowermost point of the basket interior onto the wall of the basket. This is of course enhanced by the fact that the portion 16 of the sleeve 13 is made downwardly convergent.
  • a centrifuge particularly a sugar centrifuge, comprising an upright centrifuge basket having a lower end and an upwardly diverging interior cross-section; an accelerator member connected to said basket in the region of said lower end for accelerating material being centrifuged; an electromotor at least in part above said basket and having an output shaft which extends into the same and is connected with said accelerator member for rotating said basket, said electromotor having cooling fins; and an air-guide sleeve surrounding said electromotor and shaft and having a lower open end in the region of said accelerator member, so as to direct air heated in said electromotor onto the material being centrifuged in said basket.
  • a centrifuge as defined in claim 1, said sleeve having a cylindrical upper main portion, and a lower end portion which extends from said main portion to said lower open end and conically tapers in direction towards the latter.
  • a centrifuge particularly a sugar centrifuge, comprising an upright centrifuge basket having a lower end and an upwardly diverging interior cross-section; an accelerator member connected to said basket in the region of said lower end for accelerating material being centrifuged; an air-cooled electromotor at least in part above said basket and having an output shaft which extends into the same and is connected with said accelerator member for rotating said basket; and an air-guide sleeve connected to said electromotor and defining a passage for air heated by heat exchange with the electromotor, said passage communicating with the region of said accelerator member and directing the heating air onto the material being centrifuged in said basket.
  • step of advancing comprises discharging the heated cooling air into the smaller-diameter lower end region of said basket.

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  • Centrifugal Separators (AREA)
US397098A 1972-09-14 1973-09-13 Centrifuge and method of operating the same Expired - Lifetime US3860165A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2245019A DE2245019C3 (de) 1972-09-14 1972-09-14 Kontinuierlich arbeitende Zuckerzentrifuge

Publications (1)

Publication Number Publication Date
US3860165A true US3860165A (en) 1975-01-14

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ID=5856266

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Application Number Title Priority Date Filing Date
US397098A Expired - Lifetime US3860165A (en) 1972-09-14 1973-09-13 Centrifuge and method of operating the same

Country Status (8)

Country Link
US (1) US3860165A ( )
BE (1) BE804871A ( )
CS (1) CS188901B2 ( )
DE (1) DE2245019C3 ( )
FR (1) FR2200061B1 ( )
GB (1) GB1446923A ( )
IT (1) IT998585B ( )
NL (1) NL154435B ( )

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4193536A (en) * 1977-09-24 1980-03-18 Kabushiki Kaisha Kubota Seisakusho Cooling structure for a centrifuge
US4202488A (en) * 1977-06-30 1980-05-13 Thomas Broadbent & Sons Limited Pendulum suspended hydraulically driven basket centrifuges
WO1996001151A1 (en) * 1994-07-01 1996-01-18 Baxter International Inc. Blood processing system having closed circuit heater
US20040071569A1 (en) * 2002-08-02 2004-04-15 Ellsworth James R. Decanting centrifuge with vibration isolation
US20110281712A1 (en) * 2008-11-06 2011-11-17 Hengst Gmbh & Co., Kg Centrifugal separator

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2631178C3 (de) * 1976-07-10 1981-05-27 Maschinenfabrik Buckau R. Wolf Ag, 4048 Grevenbroich Kontinuierlich arbeitende Siebzentrifuge, insbesondere Zuckerzentrifuge
CN110328061A (zh) * 2019-04-10 2019-10-15 广州市婵昕生物科技有限责任公司 一种用于生物诊疗的具有减振功能的高效型冷冻离心机

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US399113A (en) * 1889-03-05 Assigxors

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US399113A (en) * 1889-03-05 Assigxors

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4202488A (en) * 1977-06-30 1980-05-13 Thomas Broadbent & Sons Limited Pendulum suspended hydraulically driven basket centrifuges
US4193536A (en) * 1977-09-24 1980-03-18 Kabushiki Kaisha Kubota Seisakusho Cooling structure for a centrifuge
WO1996001151A1 (en) * 1994-07-01 1996-01-18 Baxter International Inc. Blood processing system having closed circuit heater
US20040071569A1 (en) * 2002-08-02 2004-04-15 Ellsworth James R. Decanting centrifuge with vibration isolation
US20070142196A1 (en) * 2002-08-02 2007-06-21 Ellsworth James R Decanting centrifuge with vibration isolation
US7699766B2 (en) 2002-08-02 2010-04-20 Harvest Technologies Corporation Decanting centrifuge with vibration isolation
US20110160031A1 (en) * 2002-08-02 2011-06-30 Harvest Technologies Corporation Decanting centrifuge with vibration isolation
US8152708B2 (en) 2002-08-02 2012-04-10 Harvest Technologies Corporation Decanting centrifuge with sliding engagement between decant ring and processing unit
US20110281712A1 (en) * 2008-11-06 2011-11-17 Hengst Gmbh & Co., Kg Centrifugal separator

Also Published As

Publication number Publication date
DE2245019C3 (de) 1980-06-04
DE2245019B2 (de) 1979-09-27
BE804871A (fr) 1974-01-02
DE2245019A1 (de) 1974-03-21
NL154435B (nl) 1977-09-15
IT998585B (it) 1976-02-20
CS188901B2 (en) 1979-03-30
FR2200061B1 ( ) 1977-05-20
NL7311857A ( ) 1974-03-18
FR2200061A1 ( ) 1974-04-19
GB1446923A (en) 1976-08-18

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