EP0456898A2 - Centrifugeuse de laboratoire - Google Patents

Centrifugeuse de laboratoire Download PDF

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Publication number
EP0456898A2
EP0456898A2 EP90123656A EP90123656A EP0456898A2 EP 0456898 A2 EP0456898 A2 EP 0456898A2 EP 90123656 A EP90123656 A EP 90123656A EP 90123656 A EP90123656 A EP 90123656A EP 0456898 A2 EP0456898 A2 EP 0456898A2
Authority
EP
European Patent Office
Prior art keywords
plastic injection
centrifuge rotor
rotor according
axis
parts
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Withdrawn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
EP90123656A
Other languages
German (de)
English (en)
Other versions
EP0456898A3 (en
Inventor
Ole Agergaard
Heinz-Gerhard Dr. Köhn
Eckart Dr. Kopowski
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.)
Heraeus Sepatech GmbH
Original Assignee
Heraeus Sepatech GmbH
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 Heraeus Sepatech GmbH filed Critical Heraeus Sepatech GmbH
Publication of EP0456898A2 publication Critical patent/EP0456898A2/fr
Publication of EP0456898A3 publication Critical patent/EP0456898A3/de
Withdrawn legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B5/00—Other centrifuges
    • B04B5/04—Radial chamber apparatus for separating predominantly liquid mixtures, e.g. butyrometers
    • B04B5/0407—Radial chamber apparatus for separating predominantly liquid mixtures, e.g. butyrometers for liquids contained in receptacles
    • B04B5/0414—Radial chamber apparatus for separating predominantly liquid mixtures, e.g. butyrometers for liquids contained in receptacles comprising test tubes

Definitions

  • the present invention relates to a centrifuge rotor for a laboratory centrifuge, which has a plurality of plastic injection-molded parts, which has a symmetry with a vertical axis which simultaneously forms the axis of rotation such that it is divided in the circumferential direction into several sectors which are identical in their construction, the Sectors have a plurality of radial and circumferential webs and surface parts, which have a plurality of receptacles for sample tubes which run radially and at an angle with their axis to the axis of rotation, a central hub part for receiving a drive shaft and an upper cover which surrounds the hub in an annular manner has several openings which limit the recordings on the upper side of the rotor.
  • centrifuge rotor is known for example from DE-PS 33 41 323.
  • the centrifuge rotor described there has a so-called wind kettle in which several sector-shaped inserts, each with one or more receptacles, are used to hold sample tubes.
  • the wind chamber is a pot-like structure made of deep-drawn sheet metal, which has a central hub area with which it is placed on the drive shaft of a centrifuge motor.
  • the sector-shaped inserts are identical plastic injection-molded parts, preferably six such sector inserts are inserted into the air chamber, so that they completely fill them - which are characterized by their simple and inexpensive production.
  • the sector inserts have various surface parts which run radially and axially to the axis or axis of rotation of the rotor and which stiffen the individual sector parts.
  • the problem with such parts molded from plastic is that the surface parts are arranged in such a way that on the one hand there is sufficient stability of the sector inserts and on the other hand the injection mold is constructed as simply as possible, preferably from two parts, in such a way that the injection molded sector-shaped inserts can be removed from the mold.
  • rotor parts made from injection molded plastic parts, a low rotor weight can also be achieved.
  • centrifuge rotor Another fixed-angle centrifuge rotor is known from DE-PS 33 43 846.
  • This centrifuge rotor has a deep-drawn sheet metal upper part which is placed on a likewise deep-drawn sheet metal lower part. The two parts are held on a hub.
  • An annular insert part is inserted between the lower part and the upper part, which has individual ribs, between which centrifuge tubes or sample vessels can be placed.
  • This insert part can be made of plastic by injection molding.
  • This centrifuge rotor is thus composed of two sheet metal parts, a central hub and a plastic injection molded insert.
  • the invention has for its object to provide a centrifuge rotor of the fixed-angle type, which is composed of two plastic injection molded parts, a very light
  • the structure still has sufficient stability, which can be easily removed from the plastic injection molds and which enables good cleaning in the event of contamination, for example if a centrifuge tube breaks.
  • the present object is achieved in that it is composed of an upper and a lower plastic injection part, the upper plastic injection part having the cover which merges into an outer side wall, and the lower plastic injection part has a base plate which extends from the lower, outer The circumferential edge extends towards the hub, the two plastic injection molded parts being held centered with respect to each other both in the area of the hub and in the area of the side wall, so that all radial, axial and circumferential webs and surface parts with their surface parallel to the planes in which the axis extends, or are spanned perpendicular to these planes, and that at least edge parts of the base plate extend upward on the radially outer edge, form an upward peripheral edge, and the upper plastic injection part engages behind these edge parts with a lower peripheral edge.
  • the entire fixed-angle centrifuge rotor is composed of two parts, namely an upper plastic injection part and a lower plastic injection part, which engage with one another with their side walls in the hub area and with the webs and surface parts in between in such a way that they stiffen and stabilize one another.
  • There webs and surface parts are molded onto the respective inner walls of the upper and lower plastic injection-molded parts such that they run radially, axially and in the direction of rotation, but their surfaces run parallel to the planes in which the axis of rotation of the rotor lies or perpendicular to these Levels.
  • a particular stiffness of the rotor is achieved in that edge parts of the base plate of the lower plastic part extend upwards at their radially outer edge and form an upwardly directed peripheral edge, and the upper plastic injection part has a lower peripheral edge which engages behind these edge parts of the lower plastic injection part.
  • the upper plastic injection part is thereby supported radially outwards against the edge of the lower plastic injection part, so that the upper plastic injection part, against that the centrifuge tubes are essentially in contact during centrifugation, in view of the high forces occurring during centrifugation.
  • the two molded plastic parts are additionally kept centered in the region of the hub.
  • the upper plastic injection-molded part is preferably reinforced with an abutment body in the area of the receptacle for a sample tube, this abutment body simultaneously ensuring a uniform and gentle abutment of the centrifuge tube.
  • These contact bodies are also made of flat parts in order to keep the weight of the entire centrifuge rotor low.
  • the contact bodies can each have a central web, which is aligned in a plane which runs through the axis of the receptacle assigned to it, this web simultaneously forming a linear contact for an inserted sample tube, via which a large proportion of the radial forces during the Centrifugation is transferred and recorded.
  • An additional stiffening of the contact body is achieved by two side webs which limit each contact body, seen in the circumferential direction.
  • receptacle body ribs can be provided in an advantageous development, which ribs are spaced apart from one another in the direction of the axis of the receptacle and with their surface in the direction the axis of rotation.
  • the upper plastic injection-molded part can be formed from tools which only consist of a lower and an upper tool part.
  • Additional systems for a sample tube inserted into the receptacle are formed by the free edges of these ribs of the receptacle body forming a fictitious cylinder jacket, the axis of which coincides with the axis of the receptacle, this cylinder jacket corresponding to the outer circumference of a sample tube inserted into the receptacle.
  • radially extending stiffening ribs are molded onto the inside of the upper plastic injection molded part, starting from the hub, the cover, the has the receiving openings for the sample tubes, support, and extend on the inside of the side wall to the lower, outer peripheral edge, so that they form an L-shaped surface part when viewed practically from the side.
  • stiffening ribs can additionally protrude in the direction of the axis of rotation of the rotor over the lower peripheral edge of the upper plastic injection part and form support webs which additionally engage behind the edge parts of the base plate on the lower plastic injection part and a particularly rigid connection or interlocking between the upper and form the lower plastic injection part.
  • the above-mentioned side webs and / or the central web of each contact body can protrude beyond the lower peripheral edge of the upper plastic injection part and form a corresponding system, so that individual supports are then distributed over the entire peripheral edge of the upper plastic injection part at a short distance from one another -Ridges that engage behind the lower peripheral edge are formed.
  • both the lower peripheral edge of the upper plastic injection molded part and the one at the top can directed peripheral edge of the lower plastic injection part, if necessary without interruption, running continuously, and, seen in the direction of the axis of rotation, be designed to interlock.
  • a particularly good connection between these two peripheral edges is achieved in that the interlocking peripheral edges are tapered in cross-section in the planes extending through the axis, the bevel on the upper plastic injection part running out on the outside, while the bevel on the lower plastic injection part on the inside of the upward peripheral edge runs out, so that the lower peripheral edge of the upper plastic injection part is supported on the upward peripheral edge of the lower plastic injection part.
  • a simplified structure of the contact body can be achieved by combining adjacent contact bodies that belong to adjacent receptacles in pairs, running parallel to one another.
  • one of the side webs is unnecessary in each case; furthermore, these coinciding side webs can be formed by one of the stiffening ribs, so that there is a simple surface structure.
  • the lower plastic injection-molded part has an approximately flat, ring-shaped bottom surface that runs perpendicular to the axis, on the radially outer outer edge of which the upward peripheral edge is connected, this bottom surface and the peripheral edge in the area of each Form adapters for the sample tubes;
  • the individual sample tubes lie with their lower part in the transition region between the bottom surface and the peripheral edge on their radially outer side.
  • a conical jacket part is attached to the upper edge of the lower peripheral edge of the lower plastic injection part, which is parallel to the jacket spanned by the axes of the receptacles for the sample tubes runs.
  • centering webs can take on a further task centering the sample tubes, which are molded on in these transition areas.
  • annular surface attaches to the upper edge of the casing part of the lower plastic injection part and is connected to the hub.
  • the hub can be a cylindrical, sleeve-shaped part that sits on a drive shaft of a drive motor.
  • Y-shaped webs are arranged on the inside of the lower plastic injection-molded part, as seen in plan view in the direction of the axis. Of these Y-shaped webs, one leg is connected to the hub, while the other two legs run approximately radially outward and rest on the inside of the side wall of the upper plastic injection molded part. These Y-shaped webs each extend between two adjacent contact bodies combined in pairs, so that the contact bodies each extend between two outer legs of adjacent Y-shaped webs. These adjacent legs of adjacent Y-shaped webs run approximately parallel to one another.
  • the lower plastic injection part has a central opening in the cover, which also has the openings for the receptacles of the centrifuge tubes, which surrounds the hub or through which the hub preferably extends in a sleeve-shaped configuration.
  • the hub When assembling the parts, they are centered radially in the area of the hub.
  • centering parts arranged on the lower and the upper plastic injection-molded part can be useful with regard to centering in the circumferential direction, these centering parts being formed by an axially extending web which engages in a groove in a particularly simple embodiment.
  • the groove is preferably located in the outer wall of a sleeve-shaped hub and in this groove engaging web is preferably formed by a slightly elongated stiffening rib in the region of the end face.
  • the centrifuge rotor - this centrifuge rotor is a fixed-angle centrifuge rotor - has an upper plastic injection part 1 and a lower plastic injection part 2.
  • the upper plastic injection part 1 has a cover 3, which closes the rotor at the top and which runs slightly inwards from the upper outer edges, ie towards the underside 5 of the rotor.
  • This cover 3 is followed by an outer side wall or a conical jacket-shaped jacket part 6, which ends in a free, lower peripheral edge 7.
  • the cover 3 has twelve circular receiving openings 8 for sample tubes. These openings lie on a common radius, the center of which forms the axis 9 of the arrangement, which is also the axis of rotation.
  • the cover 3 also has a central opening 10 which, when the upper plastic injection part 1 and the lower plastic injection part 2 are put together, is pushed over a sleeve-shaped hub part 11, arranged centrally on the axis 9 on the lower plastic injection part 2.
  • the lower plastic injection part 2 has an annular bottom surface 12 which extends perpendicular to the axis 9 and on whose radially outer edge an upwardly directed peripheral edge 13 extends. This peripheral edge 13 extends at a right angle to the annular bottom surface 12 with a height above the bottom surface of approximately 20 mm.
  • the radially inner edge of the annular bottom surface 12 is adjoined by a cone-shaped jacket part 14, which runs parallel to the fictitious surface spanned by the receiving axes 15 or parallel to the side wall 6 of the upper plastic injection part 1.
  • annular space 16 is formed, into which, in the direction of the receiving axes 15 shown through the receiving openings 8 in the cover 3, inserted sample tubes, not shown.
  • An annular surface 17 adjoins the upper edge of the jacket part 14, which runs parallel to the bottom surface 12 and is connected to the hub part 11.
  • contact bodies 18 are arranged on the inside of the upper plastic injection-molded part 1, specifically assigned to each receiving opening 8, and are made up of different surface parts and webs. Furthermore, two adjacent abutment bodies 18 are combined to form a unit, so that, with regard to the twelve receiving openings 8, 6, these abutment body units are formed, which extend radially outward evenly distributed over the circumference of the upper plastic injection part 1.
  • Each of these contact bodies 18 has a central web 19 and two side webs 20 running parallel to this central web 19. The surface of the central web 19 is aligned in a plane which runs through the receiving axes 15.
  • the mutually adjacent side webs 20 are each combined by two paired contact bodies 18, the common side web 20 being designed as a stiffening rib 21 which, in contrast to the side webs 20, extend up to the central opening 10 in the cover 3.
  • receiving body ribs 22 are injection molded, which are spaced approximately 10 mm apart from one another in the direction of the receiving axes 15 and with their surfaces parallel to that The axis of rotation 9 runs, as can be clearly seen from FIG. 4.
  • the free edges of these receiving body ribs 22 end on a fictitious cylinder jacket, the axis of which coincides with the receiving axis 15 of each receiving device, as illustrated in FIG. 3.
  • the paired combination of the contact bodies 18 forms a relatively large space between such contact body pairs, in each of which a further stiffening rib 23 runs, the shape and size of which stiffening ribs 21 between the paired abutment bodies 18 and which also extend in accordance with these stiffening ribs up to the central opening 10.
  • All stiffening ribs 21 and 23 as well as the side webs 20 are designed to be extended over the peripheral edge 7, these extended parts, as already indicated above, bearing against the inside of the upward peripheral edge 13 of the lower plastic injection-molded part 2.
  • radially extending, Y-shaped webs 25 are also injection molded for reinforcement, one leg 26 being connected to the credit part 11, while the other two legs 27 are directed upwards Extend peripheral edge 13 and are connected to this.
  • the two other legs 27 run at such an angle to one another that adjacent legs 27 of adjacent Y-shaped webs 25 are aligned parallel to one another.
  • the distance between these other legs 27, which run parallel to one another is selected such that the contact bodies 18, which are combined in pairs, fit into this intermediate space.
  • the further stiffening ribs 23 rest on the upper plastic injection part 1 in the area of the hub part 11 on the inner legs 26 of the Y-shaped webs 25, so that they are one in the assembled state of the two plastic injection parts 1, 2 Form surface unit, while the outer, downward facing parts of the further stiffening ribs 23 in the space between the other two legs 27 of the Insert Y-shaped bars.
  • This achieves a complex, but extremely stable structure that absorbs the centrifugal forces that occur during centrifugation.
  • centering webs 28 are also injection molded onto the lower plastic injection part 2, which can also be clearly seen in FIG. 3 and which, when the centrifuge rotor is assembled, are in each case below the two middle webs 19 and of the intermediate stiffening web 21 of a contact body 18 combined in pairs and form an additional centering for the sample tubes inserted into the rotor.
  • centering parts are in the form of a lug 29 which is formed by a stiffening rib 21 which is slightly extended into the central opening 10. and a groove 30, which is embedded on the outside of the sleeve-shaped hub part, is provided.
  • thermoplastic As a plastic for the production of the two injection molded parts 1, 2, short fiber reinforced thermoplastic has proven itself well.
  • FIG. 2 shows a fastening element 31 which bears with its edge in the cover 3 of the upper plastic injection part and is screwed into the hub part 11 of the lower plastic injection part 2 and holds the two plastic injection parts 1, 2 together.
  • the centrifuge rotor can be constructed from the two plastic injection parts 1, 2 described, both of which can be removed from a plastic injection mold, which nevertheless have sufficient rigidity, and which are easy to clean in the event of contamination if a sample tube breaks.
  • This centrifuge rotor of the fixed-angle type has proven itself particularly well in the field of medicine, where speeds of 5000 to 6000 are possible.

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  • Centrifugal Separators (AREA)
EP19900123656 1990-05-05 1990-12-08 Laboratory centrifuge Withdrawn EP0456898A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4014440 1990-05-05
DE19904014440 DE4014440C1 (fr) 1990-05-05 1990-05-05

Publications (2)

Publication Number Publication Date
EP0456898A2 true EP0456898A2 (fr) 1991-11-21
EP0456898A3 EP0456898A3 (en) 1991-12-18

Family

ID=6405765

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900123656 Withdrawn EP0456898A3 (en) 1990-05-05 1990-12-08 Laboratory centrifuge

Country Status (2)

Country Link
EP (1) EP0456898A3 (fr)
DE (1) DE4014440C1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0626205A3 (fr) * 1993-05-27 1995-05-17 Du Pont Rotor centrifugeur en forme de coquille.

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19715661A1 (de) * 1997-04-16 1998-10-22 Mann & Hummel Filter Zentrifugenrotor
DE102018120007A1 (de) * 2018-08-16 2020-02-20 Eppendorf Ag Festwinkelrotor

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3341323C2 (de) * 1983-11-15 1987-02-19 Heraeus Separationstechnik GmbH, 3360 Osterode Laboratoriumszentrifuge
DE3343846C2 (de) * 1983-12-03 1987-02-12 Heraeus Separationstechnik GmbH, 3360 Osterode Zentrifugenrotor
DE3601789C1 (en) * 1986-01-22 1987-03-05 Eppendorf Geraetebau Netheler Centrifuge rotor
EP0296254B1 (fr) * 1987-06-20 1991-03-20 Eppendorf-Netheler-Hinz Gmbh Rotor pour centrifugeuse

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0626205A3 (fr) * 1993-05-27 1995-05-17 Du Pont Rotor centrifugeur en forme de coquille.

Also Published As

Publication number Publication date
DE4014440C1 (fr) 1991-07-04
EP0456898A3 (en) 1991-12-18

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