EP2000214A2 - Anordnung für die Zentrifugaltrennung, insbesondere für die Ölindustrie - Google Patents

Anordnung für die Zentrifugaltrennung, insbesondere für die Ölindustrie Download PDF

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Publication number
EP2000214A2
EP2000214A2 EP08425402A EP08425402A EP2000214A2 EP 2000214 A2 EP2000214 A2 EP 2000214A2 EP 08425402 A EP08425402 A EP 08425402A EP 08425402 A EP08425402 A EP 08425402A EP 2000214 A2 EP2000214 A2 EP 2000214A2
Authority
EP
European Patent Office
Prior art keywords
machine
transmission unit
vertical
shaft
belt
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.)
Withdrawn
Application number
EP08425402A
Other languages
English (en)
French (fr)
Other versions
EP2000214A3 (de
Inventor
Paolo Rapanelli
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.)
RAPANELLI FIORAVANTE SpA
Original Assignee
RAPANELLI FIORAVANTE SpA
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 RAPANELLI FIORAVANTE SpA filed Critical RAPANELLI FIORAVANTE SpA
Publication of EP2000214A2 publication Critical patent/EP2000214A2/de
Publication of EP2000214A3 publication Critical patent/EP2000214A3/de
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • B04B9/08—Arrangement or disposition of transmission gearing ; Couplings; Brakes

Definitions

  • the invention relates to a machine for the centrifugal separation, designed in particular for the oil-producing industry. Nonetheless, it could also apply to other technical fields.
  • a machine of the kind forming the subject of the present invention includes a vertical-axis centrifugal separator and allows separation of liquids of different densities and features, by means of high peripheral velocity centrifugation.
  • This machine downstream of a continuous-processing-cycle plant for the extraction of olive oil at ambient temperature, it permits to separate oil from “vegetation water” (water contained in the olive) and from any suspended solid residues.
  • the current transmission unit also renders its assembling more difficult and increases the time required for carrying out this job.
  • the object of the present invention is to eliminate these disadvantages.
  • an object of the present invention consists in the realisation of a both effective and efficient transmission unit arranged between the electric motor and the vertical shaft of the centrifugal separator.
  • An additional object of the present invention is the reduction of the cost of the transmission unit for each centrifugal separator, as compared with the presently employed transmission unit, by reducing the number of its components, thereby leading at the same time to less difficult and less time-consuming assembling operations.
  • a further object of the invention is to design a low-noise transmission unit which does not require the use of individual (separate) means for the protection from noise.
  • the invention provides a machine for the centrifugal separation, which is designed in particular for the oil-producing industry, comprising a vertical-axis centrifugal separator which is provided with a vertical transmission shaft, the latter receiving the motion from an output shaft (drive shaft) of an electric motor, wherein the connection between said vertical transmission shaft and said output or drive shaft is realised by a transmission unit with a flexible member.
  • this transmission is a synchronous transmission unit and the flexible member is a timing belt (positive drive belt) having cogs which engage with the drive pulley and the driven pulley, and which are provided with a profile/contour corresponding to that of the belt.
  • a timing belt positive drive belt
  • the machine for performing centrifugal separation comprises a machine bed 1, a centrifugal separator with vertical axis (vertical-axis centrifugal separator) generally indicated by 2, and an electric motor 3 which cooperates with the centrifugal separator 2.
  • the machine bed 1 acts as support of the machine components.
  • the machine bed 1 is appropriately anchored to the ground at its lower part, while at its upper part 4 it carries the centrifugal separator 2 and the electric motor 3.
  • the centrifugal separator 2 is of the vertical-axis kind; for instance, the present invention may apply to the model Ramef 2750/G, already manufactured by the applicant itself, which therefore does not require further explanation.
  • the centrifugal separator 2 is equipped with a vertical transmission shaft 5 as shown in the cutaway portion of the front view of Figure 1 . It can be seen that the centrifugal separator is fixed to the upper part 4 of the machine bed in such a manner that the vertical transmission shaft 5 downwardly projects into the machine bed at its lower end.
  • the electric motor 3 could be an asynchronous three-phase motor, with a cage-type rotor, two pole pairs, and a rating (power) of 7.5 kW.
  • the motor flange - not shown in detail - of motor 3 is appropriately fixed to the upper part 4 of the machine bed 1 with the interposition of a mount plate 6 which is visible in Figure 2 .
  • Plate 6 has an aperture traversed by the drive shaft (output shaft) 7 of the electric motor 3, the lower end of this drive shaft projecting downwardly, starting from the upper side 4 of the machine bed, in a way similar to the vertical transmission shaft 5.
  • Motor 3 is vertically positioned on one side of the centrifugal separator 2 so that, according to the present invention, the respective shafts - i.e. the drive shaft 7 and the vertical transmission shaft 5 - can receive (support) the mechanical members embodying the motion transmission unit, the latter including said flexible member and being generally referenced 8 in the figure.
  • This transmission unit 8 with flexible member comprises a drive pulley 9, rigidly attached to the lower end of the drive shaft, a driven pulley 10, rigidly attached to the lower end of the vertical, transmission shaft 5, and a belt 11, connecting the drive pulley 9 and the driven pulley 10 with each other.
  • the transmission unit 8 with flexible member is received inside the machine bed 1 and may be reached through an aperture, which is normally closed by a removable panel 12, the latter being provided frontally in the machine bed 1.
  • the correct strain of the transmission belt is obtained by directly acting on the plate 6 used to fix the motor, this plate being suitably shaped for this purpose. Due to functional requirements, linked to the nature of the separation process carried out by the machine, the transmission 8 with flexible member is of a synchronous kind. Therefore, the belt has cogs.
  • the cogs (teeth) of the timing belt 11 engage with the drive pulley 9 and the driven pulley 10, these having a toothed contour corresponding to that of the timing belt 11.
  • the timing belt 11 has a toothed profile in the form of a double helix (not shown, since already well-known). This particular profile of the cogs allows a progressive and continuous engagement of the timing belt 11 with the drive pulley 9 and the driven pulley 10, thereby insuring, in this way, a considerable reduction of vibrations and noise.
  • the efficiency of the transmission is particularly high.
  • the electric motor 3 is controlled by an inverter that insures a gradual and progressive delivery of the torque during the most critical phase, corresponding to the machine starting phase.
  • the vertical transmission shaft 5 to which the driven pulley 10 is attached, drives in rotation a drum (not shown) of the centrifugal separator 2, at a speed of about 6450 rpm, to allow the separation of liquids contained in the drum, i.e. of oil and water, by virtue of the centrifugal action.
  • the vertical transmission shaft 5 of the centrifugal separator 2 is supported on its lower side by means of two angular-contact ball bearings, mounted in an "O" configuration, and which are received within a spherically shaped support, so that the vertical transmission shaft 5 is free to oscillate. This movement is in any case limited by springs (not shown) of adequate stiffness, which constitute an upper elastic support for the vertical transmission shaft 5 of the separator.
  • the action of the belt 11 on the vertical transmission shaft 5 causes a tilting moment whose magnitude depends on the transmitted torque.
  • the most critical phase is the starting phase, when the machine is started, during which phase all masses need to be accelerated to their steady-state velocity, by overcoming the mechanical forces of friction. Defining, by means of the inverter, a "soft" acceleration ramp for the motor, it is anyway possible to limit/control the tilting action within acceptable values.
  • the weight of the shaft and of the drum is enough to avoid a lifting of the shaft during normal machine operation.
  • the transmission unit 8 with flexible member according to the present invention does not eliminate the possibility of height-adjusting the vertical transmission shaft 5 and the drum which is integral with it, which adjustment is necessary during the assembling of the machine.
  • the machine for the centrifugal separation according to the present invention which is provided with a flexible-member transmission unit, has several advantages. Some are briefly stated in the following part of the description.
  • the noise is greatly reduced, compared with a centrifugal separator of the prior art, due to the specific double helical profile, or "circular-arc" profile, of the teeth of the timing belt, which allows a progressive and continuous engagement with the pulleys, thereby reducing vibrations and consequently the noise of the transmission unit.
  • the mesh is very accurate and no slipping phenomena occur; these phenomena could originate tooth wear and thus reduce the life of the transmission.
  • the uniform transmission of the loads by the meshing teeth allows to transmit high powers with efficiencies above 95%. This is a great advantage in terms of energy savings.
  • the mutual distance between the axes of the transmission is adjusted by adjusting the mount plate of the electric motor on the machine bed, as already mentioned above.
  • a further advantage of the present invention is that on the machine bed there may be provided/fixed several centrifugal separators driven by a single electric motor by means of flexible-member transmission units analogous to the one already described.

Landscapes

  • Centrifugal Separators (AREA)
EP08425402A 2007-06-07 2008-06-05 Anordnung für die Zentrifugaltrennung, insbesondere für die Ölindustrie Withdrawn EP2000214A3 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITRM20070322 ITRM20070322A1 (it) 2007-06-07 2007-06-07 Macchina per la separazione centrifuga destinata in particolare all industria olearia

Publications (2)

Publication Number Publication Date
EP2000214A2 true EP2000214A2 (de) 2008-12-10
EP2000214A3 EP2000214A3 (de) 2011-01-19

Family

ID=39719058

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08425402A Withdrawn EP2000214A3 (de) 2007-06-07 2008-06-05 Anordnung für die Zentrifugaltrennung, insbesondere für die Ölindustrie

Country Status (2)

Country Link
EP (1) EP2000214A3 (de)
IT (1) ITRM20070322A1 (de)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2878943A (en) * 1955-04-20 1959-03-24 Z & W Machine Products Inc Oil and chip separator
CH377723A (de) * 1960-07-26 1964-05-15 Frauchiger Hans Spulenzentrifuge
US3944133A (en) * 1972-12-26 1976-03-16 Rohe Scientific Corporation Automated centrifuge
JP2005083428A (ja) * 2003-09-05 2005-03-31 Tsubakimoto Chain Co はす歯ベルト駆動装置、および、これに用いるはす歯プーリ

Also Published As

Publication number Publication date
ITRM20070322A1 (it) 2008-12-08
EP2000214A3 (de) 2011-01-19

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