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

• the invention relates to a solid-bowl screw centrifuge with a drivable drum which is mounted on the two end faces and can be rotated about a horizontal axis, and a co-screw which is rotatably mounted coaxially therein and can be driven with a differential speed relative to the drum
• the Drive has a multi-stage epicyclic gear, the housing shell is connected to the drum shell and the output shaft is connected to the screw conveyor.
• the solid With the help of a differential speed between the drum and the screw, the solid is guided to the solid discharge at one end of the drum.
• Solid-bowl screw centrifuges are known in which the planetary gear with the drum is arranged between the drum bearings or outside the drive-side drum bearing.
• a screw centrifuge is known from US Pat. No. 5,403,260 in which the planetary gear is arranged outside the drum bearing. This is about it is a so-called "external gear".
• the disadvantage is that both the hub of the housing of the epicyclic gear and the gear output shaft must be passed through the drive-side bearing of the drum. The resulting bearing size leads to problems at high speeds of the drum and the screw conveyor.
• the natural frequency of the drum is one of the limiting variables for the maximum possible drum speed.
• the invention has for its object to design a screw centrifuge of the type mentioned so that high peripheral speeds of the drum and large drum diameters are possible when using multi-stage planetary gears.
• Drum bearing is provided between two stages of the multi-stage epicyclic gear.
• the housing of the multi-stage epicyclic gear in the region of the gear-side drum bearing has a cylindrical intermediate piece with a reduced diameter compared to the housing parts of the gear stages.
• the gear-side drum bearing receives the intermediate piece and a shaft connecting the gear stages. The diameter of the intermediate piece thus corresponds to the inside diameter of a suitable drum bearing.
• FIG. 1 shows a schematic representation of a known screw centrifuge with an internal, multi-stage epicyclic gear
• FIG. 2 shows a known screw centrifuge with an external, multi-stage planetary gear in a schematic representation
• FIG. 3 shows an embodiment according to the invention in a schematic illustration
• Figure 4 shows a known screw centrifuge, in contrast to the
• the epicyclic gear is arranged at the end of the drum at which the liquid is discharged
• 5 shows a known screw centrifuge, in which, in contrast to the embodiment according to FIG. 2, the epicyclic gear is provided at the end of the drum at which the liquid is dropped and
• FIG. 6 shows an embodiment according to the invention with the planetary gear at the liquid end of the drum.
• the solid-bowl screw centrifuges which are shown in FIGS. 1 to 6, have a drum 1 which is rotatably mounted about a horizontal axis 2.
• a screw conveyor not shown, is arranged coaxially in the drum and is likewise rotatably mounted about the horizontal axis 2.
• the screw conveyor is driven via an output shaft 3 of a multi-stage epicyclic gear 4, which is arranged in the solid bowl screw centrifuge according to FIG. 1 with the drum 1 between the bearings 5, 6.
• the epicyclic gear 4 is provided outside the gear-side bearing 5.
• FIGS. 3 and 6 Embodiments of the construction according to the invention are shown in FIGS. 3 and 6.
• the gear-side drum bearing 5 is arranged between the stages 7 and 8 of the epicyclic gear 9.
• the gear housing 10, which rotates during operation, is connected to the drum shell 1 1 and has a cylindrical intermediate piece 1 2 in the area of the gear-side drum bearing 5, the diameter of which is reduced compared to the housing parts of the gear stages 7 and 8.
• the bearing 5 thus receives the intermediate piece 1 2 and a shaft 1 3 connecting the gear stages 7 and 8.
• the intermediate piece 1 2 is divided transversely to the axis of rotation 2, specifically for reasons of assembly.
• the drum shell 11 can have a diameter which is greater than 1,000 mm.
• the ratio between the center distance L of the bearings 5 and 6 the drum 1 and the diameter D of the drum shell 1 1 (L / D) can be greater than 3.8.
• the torque between the drum and the screw conveyor can be, for example, 1 00,000 Nm.
• the peripheral speed at the inner radius of the drum shell 1 1 can be greater than 105 m / s.
• the arrangement according to the invention of the gear-side drum bearing between two stages of a multi-stage epicyclic gear is particularly suitable for very large decanters.
• the epicyclic gear can be provided with the arrangement of the drum bearing 5 between the gear stages on the solids-side or on the liquid-side drum end.

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• Centrifugal Separators (AREA)

Priority Applications (6)

Applications Claiming Priority (2)

Publications (1)

Family

ID=7857905

Family Applications (1)

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Cited By (2)

Families Citing this family (4)

Citations (3)

Family Cites Families (39)

• 1998
  • 1998-02-17 DE DE19806374A patent/DE19806374C1/de not_active Revoked
• 1999
  • 1999-01-07 JP JP2000532219A patent/JP4212236B2/ja not_active Expired - Fee Related
  • 1999-01-07 US US09/622,408 patent/US6387032B1/en not_active Expired - Lifetime
  • 1999-01-07 WO PCT/EP1999/000055 patent/WO1999042220A1/de not_active Ceased
  • 1999-01-07 DE DE59901620T patent/DE59901620D1/de not_active Expired - Lifetime
  • 1999-01-07 EP EP99902523A patent/EP1056545B2/de not_active Expired - Lifetime
  • 1999-01-07 DK DK99902523.2T patent/DK1056545T4/da active
• 2000
  • 2000-08-15 NO NO20004078A patent/NO319825B1/no not_active IP Right Cessation

Patent Citations (3)

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