Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
  • B04B—CENTRIFUGES
  • B04B7/00—Elements of centrifuges
  • B04B7/08—Rotary bowls
  • B04B7/12—Inserts, e.g. armouring plates
• • 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
  • B04B1/04—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles with inserted separating walls
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
  • B04B—CENTRIFUGES
  • B04B5/00—Other centrifuges
  • B04B5/005—Centrifugal separators or filters for fluid circulation systems, e.g. for lubricant oil circulation systems

Definitions

• the invention relates to a centrifuge, in particular a free jet centrifuge for cleaning lubricating oil of an internal combustion engine, having axially aligned deposition surfaces according to the preamble of claim 1.
• the invention also relates to an insert for such a centrifuge rotor, having said deposition surfaces according to the preamble of claim 8.
• Such deposition surfaces for centrifuge rotors are known for example from WO00723194. These deposition surfaces are arranged in an interchangeable insert and are intended to absorb dirt from the fluid to be centrifuged. If such an insert is sufficiently loaded with particles, it can be replaced or cleaned. This enables the centrifuge rotors to be operated particularly economically, since when the rotor reaches the highest dirt holding capacity, only the insert has to be changed.
• the known dirt holding inserts have so far not produced an optimal result with regard to the separation performance of the centrifuges.
• the inserts are not optimally adapted to the flow conditions in the centrifuge rotor, which is why the dirt particles cannot be completely removed from the fluid to be centrifuged.
• the object of the invention is therefore to provide a centrifuge with an insert housed in the rotor, which provides optimal results with regard to the separated particles. This object is solved by the features of claims 1 and 8.
• an insert is accommodated in the centrifuge rotor, which has deposition surfaces which are aligned spirally to the axis of rotation of the rotor.
• the insert can be flowed through axially, ie the deposition surfaces are axially al are arranged in use so that they allow an axial or at least substantially axial flow through the same.
• the spiral arrangement of the deposition surfaces is to be understood in such a way that they have an angle between 0 and 90 ° with respect to a straight line running through the axis of rotation of the rotor (0 ° would be aligned as a radial rib and 90 ° would be designed as a peripheral wall mean).
• the deposition surfaces run at a constant angle ⁇ to any plane running through the axis of rotation of the rotor. This results in a steady acceleration of the fluid in the channels of the insert.
• a particularly good result with regard to the deposition can be achieved if the angle ⁇ is 45 °. However, depending on the application and the particle size, this does not rule out the possibility of choosing angles that deviate from the value of 45 °.
• the insert has either an inner tube, an outer tube or an inner and outer tube.
• the deposition surfaces can be attached to these pipes, so that a stable composite body is created. Due to the stability, the wall thickness of the individual walls can be minimized and thus the volume of the insert can be maximized, so that this space is available for separating particles.
• the insert with the inner and outer tube is advantageously installed in the rotor in such a way that the insert is supported with the outer tube in the rotor and the inner tube communicates with the spindle of the housing, which carries the bearing for the rotor, with little friction.
• the insert can also be arranged interchangeably in the rotor.
• the insert only needs to be replaced when the service life is reached.
• cleaning of the insert is also conceivable, since the deposition surfaces are arranged so that they are easily accessible.
• the cleaning can e.g. B. by means of compressed air or by means of a cleaning jet along the axial deposition surfaces.
• FIG. 1 shows the schematic section through a free-jet centrifuge with a rotor, into which an insert is installed
• Figure 2 shows the cross section through an insert according to Figure 1
• Figure 3 is a perspective view of the insert.
• a centrifuge 104 with a rotor 10 is shown in FIG.
• the housing 101 contains a spindle 12 on which the rotor is rotatably mounted by means of bearing rings 16, 18.
• the spindle is still hollow, so that via an inlet 102 accordingly of the arrow 20, the fluid can penetrate into the rotor 10 through openings 22, 24.
• the rotor 10 can have a bearing tube which carries the bearing rings 16, 18 and separates the interior of the rotor from the spindle. Additional openings for the passage of the fluid must be provided in this bearing tube.
• the rotor 10 further comprises an outer wall 14.
• the outer wall 14 is sealed off from the spindle, the bearing rings 16, 18 being used here. This prevents the liquid to be centrifuged from the centrifuge rotor from escaping into the housing in larger quantities.
• the liquid enters the centrifuge rotor through said openings 22, 24.
• the liquid consists of the oil for an internal combustion engine.
• the rotor 10 thus forms a chamber 30 which results from the space between the bearing rings 16, 18 and the outer wall 14. Without any structure in chamber 30, the fluid would take the path of least resistance.
• This path extends along the spindle and behind an annular cutting disc 32 to the drive chamber 33, which is located below the cutting disc.
• the fluid follows this path, its rotation is less than that of the centrifuge rotor. This is due to the fact that there is less centrifugal force near the spindle than on the outside of the rotor. This means that the particles to be separated have to travel a long way to reach the separation surface on the outer wall.
• an insert 40 with separating surfaces is accommodated in the chamber 30.
• the insert 40 extends from the spindle 12 (alternatively, but not shown, from the bearing tube) to an outer wall 14 of the insert.
• the insert further has an upper end face 42 and a lower end face 44. Not necessary, but advantageously, the end face 42 and the end face 44 are parallel to each other and perpendicular to it Axis of rotation 46 of the centrifuge.
• the insert is also designed so that it can be replaced. For this purpose, the centrifuge rotor 10 and the housing 101 are apparently designed (not shown).
• the insert is suitable for collecting a large amount of the particles in the fluid to be centrifuged.
• the insert When it reaches its limit capacity, it can either be thrown away and replaced with a new one, or it can be cleaned and then used again. Since the insert does not have a supporting function, it can be made from an inexpensive material. This can e.g. B. Be plastic like nylon 66. This material also has the advantage of low weight, which means that the inertia of the centrifuge rotor is low and therefore the performance of the drive nozzles leads to high speeds. Plastic is also easy to process. Due to the simple structure of the insert, this can, for. B. be designed as an extruded profile and deflected to match the corresponding centrifuge rotor.
• FIGS. 2 and 3 The use is shown in more detail in FIGS. 2 and 3.
• This includes an inner tube 48 and an outer tube 50.
• the inner tube 48 is designed in such a way that the diameter is essentially equal to the diameter of the spindle or, in the case of using an inner tube, the inner tube (not shown in FIG. 1). This prevents a side flow of the liquid to be centrifuged outside of the insert. This forces the fluid to flow through the insert provided with the separation surfaces. The insert thus effectively puts the fluid to be centrifuged into the rotary motion necessary for the separation of the particles. Regardless of the diameter, the entire fluid is exposed to the same centrifugal force.
• the separation path and thus the time required for the fluid to remain in the rotor can be greatly reduced by a suitable choice of the angle of the curved separation surfaces to the respective diameter line that runs through the axis of rotation.
• the outer tube 50 has a diameter which is also substantially equal to the inner diameter of the outer wall 14 of the rotor. This can be seen in FIG. 1.
• the outer tube 50 is designed as a cylinder which extends between the two end faces 42 and 44 of the insert.
• the insert is designed in such a way that the particles settle on the concave curved separating surfaces, with an additional tendency towards the outer diameter of the insert. This means that the insert fills with the filter cake essentially from the outside in, as is already known from centrifuges according to the prior art. It can also be seen from FIGS. 2 and 3 that the insert contains a larger number of separation surfaces 52. Each of these separation surfaces also extends from the upper end face 42 to the lower end face 44 of the insert.
• each of the separation surfaces runs between the inner tube 48 and the outer tube 50.
• each separation surface forms a guide surface along which the particles can migrate in the fluid to be centrifuged in order to be separated in use.
• a continuous course of the curvature of the separating surfaces is of great advantage since the flow is least disturbed in this way. Turbulence in the flow, which can have a strongly negative effect on separation and which is necessary for applications according to the prior art, can be completely avoided in the application described.
• the separation surfaces 52 are curved over the entire distance between the inner tube 48 and the outer tube 50.
• a constant angle of curvature is maintained with respect to a plane that leads through the axis of rotation.
• the angle of curvature ⁇ 45 ° is preferred (see FIG. 2).
• the optimal angle can in particular also be between 30 and 60 °.
• the design of the separating surfaces also ensures that the separation path for the particles is the smallest in the vicinity of the inner tube, where the lowest centrifugal force prevails, since the distance between adjacent separating surfaces is reduced towards the inside of the insert.
• the insert has a length X.
• This length is predetermined by the entirety of the components of the insert, that is to say the inner tube 48, the outer tube 50 and the entirety of the separating surfaces 52.
• the length X is less than the length Y of the outer wall of the rotor 10.
• regions 54 are formed in the rotor 10 , which allow the fluid to be collected in the rotor and temporarily calmed down.
• the areas 54 merge continuously into the outer wall 14.
• the fluid can be concentrated with particles to be separated in the vicinity of the areas 54 even before it is used. This ensures that the filter cake builds up preferably on the outer tube 50 in order to ensure its stability.
• An alternative also enables several inserts to be accommodated in one rotor. In this way, a kind of modular system can be created so that rotors of different capacities can be formed with a small number of different inserts or even just one type of insert. In addition, an insert can be formed which contains fewer separation areas and takes over the tasks of the areas 54 by calming the fluid.

Landscapes

• Centrifugal Separators (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=22716725

Family Applications (1)

Country Status (5)

Families Citing this family (9)

Family Cites Families (3)

• 2001
  • 2001-03-29 AT AT01943201T patent/ATE305336T1/de not_active IP Right Cessation
  • 2001-03-29 AU AU65845/01A patent/AU6584501A/en not_active Abandoned
  • 2001-03-29 DE DE50107568T patent/DE50107568D1/de not_active Expired - Lifetime
  • 2001-03-29 EP EP01943201A patent/EP1268074B1/fr not_active Expired - Lifetime
  • 2001-03-29 WO PCT/EP2001/003563 patent/WO2001074492A2/fr active IP Right Grant

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events