EP3669993A1 - Construction de connexion - Google Patents

Construction de connexion Download PDF

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Publication number
EP3669993A1
EP3669993A1 EP18213731.5A EP18213731A EP3669993A1 EP 3669993 A1 EP3669993 A1 EP 3669993A1 EP 18213731 A EP18213731 A EP 18213731A EP 3669993 A1 EP3669993 A1 EP 3669993A1
Authority
EP
European Patent Office
Prior art keywords
locking element
locking
drive shaft
connecting structure
centrifuge rotor
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.)
Pending
Application number
EP18213731.5A
Other languages
German (de)
English (en)
Inventor
Steffen Kühnert
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.)
Eppendorf SE
Original Assignee
Eppendorf SE
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 Eppendorf SE filed Critical Eppendorf SE
Priority to EP18213731.5A priority Critical patent/EP3669993A1/fr
Priority to PCT/EP2019/085429 priority patent/WO2020127104A1/fr
Priority to CN201980091559.0A priority patent/CN113412159B/zh
Priority to JP2021535204A priority patent/JP7250140B2/ja
Priority to US17/414,364 priority patent/US20220072566A1/en
Publication of EP3669993A1 publication Critical patent/EP3669993A1/fr
Pending 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
    • 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
    • B04B2009/085—Locking means between drive shaft and rotor

Definitions

  • the present invention relates to a connection structure between the centrifuge rotor and the drive shaft of a centrifuge motor according to the preamble of claim 1.
  • Centrifuge rotors are used in centrifuges, in particular laboratory centrifuges, to separate the components from samples centrifuged therein, using the inertia. In order to achieve high segregation rates, ever higher rotation speeds are used.
  • Laboratory centrifuges are centrifuges whose centrifuge rotors operate at preferably at least 3,000, preferably at least 10,000, in particular at least 15,000 revolutions per minute and are usually placed on tables. In order to be able to place them on a work table, they have in particular a form factor of less than 1 m x 1 m x 1 m, so their installation space is limited. Preferably, the device depth is max. Limited to 70 cm.
  • laboratory centrifuges are also known which are designed as standing centrifuges, that is to say they have a height in the range from 1 m to 1.5 m, in order to be able to place them on the floor of a room.
  • centrifuges are used in the fields of medicine, pharmacy, biology and chemistry.
  • the samples to be centrifuged are stored in sample containers and these sample containers are driven in rotation by means of the centrifuge rotor.
  • the centrifuge rotors are usually set in rotation by means of a vertical drive shaft which is driven by an electric motor.
  • the coupling between the centrifuge rotor and the drive shaft is usually carried out by means of the hub of the centrifuge rotor.
  • the sample containers can contain the samples directly, or separate sample containers containing the sample are used in the sample containers, so that a large number of samples can be centrifuged simultaneously in one sample container. All Centrifuge rotors in the form of fixed-angle rotors and swing-out rotors and others are generally known.
  • connection structure between these centrifuge rotors and the drive shafts of the centrifuge motors which ensures the locking of the respective centrifuge rotor on the drive shaft during the operation of the centrifuge, is mostly independent of the type of centrifuge rotor so that different types of centrifuge rotors can be used in the same centrifuge without any problems .
  • connection structures are usually designed such that there is a screw connection between the centrifuge rotor and the shaft, as a result of which a very secure and durable connection can be produced.
  • a key is required with which the screw connection can be operated.
  • the disadvantage of this connection construction is that the key requires additional elements that can be moved and, moreover, no one-hand operation is possible.
  • connection structure is to be constructed in such a way that the locking is always ensured, wherein locking elements cannot be jammed or blocked.
  • connection structure between the centrifuge rotor and a drive shaft of a centrifuge motor which extends along a shaft axis, a first locking element being arranged on one of the elements of the centrifuge rotor and drive shaft and a second locking element being arranged on the other of the elements of the centrifuge rotor and drive shaft, the first locking element with the second locking element In the locked state of the connection is engaged and in the unlocked state is not in engagement, it is characterized in that there is an actuating means on one of the elements centrifuge rotor and drive shaft, the actuation of which causes the first locking element to disengage from the second locking element device, whereby the centrifuge rotor can be removed from the drive shaft.
  • the first locking element is a lever. This makes locking particularly easy. If the lever arm of the lever is movable in a plane parallel to the shaft axis, then the connecting structure can be made particularly slim. This is all the more so if the lever arm is movable in a plane that includes the shaft axis. “Lever arm” is understood to mean that part of the lever which locks with the second locking element.
  • the lever is arranged on a joint. This makes the lever function even easier to implement in terms of design.
  • the joint is preferably designed to be resilient because this creates restoring forces.
  • the Joint can also be effected by an elastically resilient design of the lever itself.
  • the first connecting means has at least one chamfer which serves as a locking aid, the chamfer preferably lying parallel to the longitudinal extension of the lever.
  • the first locking element is biased in the direction of engagement with the second locking element. This means that locking can take place automatically regardless of the operating status of the centrifuge.
  • the pretension can also serve as a pretension for the actuating means, but a separate prestress is preferably provided for the actuating means.
  • the first locking element is arranged on the drive shaft. This allows the connection structure to be kept very compact. It is then advantageously provided that there are at least four first locking elements, preferably six first locking elements. This makes locking particularly secure.
  • the second locking element is a projection on the centrifuge rotor on which the first locking element is supported in the locked state. This makes the connection structure particularly simple.
  • the actuating means has a contact surface for a counter-contact surface of the first locking element, one of the two surfaces contact surface and counter-contact surface having an inclined course in the actuating direction of the actuating means, at least in the locked state of the connecting structure, such that actuation of the actuating means occurs Swiveling the first locking element is effected. This makes unlocking particularly easy.
  • the counter abutment surface in the locked state is inclined to the direction of the shaft axis. This allows levers arranged on a joint to be unlocked very easily, for example.
  • the contact surface is then best run straight in the direction of the shaft axis, but may also have an inclination, which, however, must be dimensioned such that when the actuating means is displaced in the actuating direction, an unlocking force is exerted on the first locking element.
  • the first locking element and the second locking element have contact surfaces which, when the connection structure is locked, abut one another and bring about the locking, these contact surfaces being inclined relative to a radial surface about the shaft axis. This allows the locking mechanism to grip the drive shaft early when the centrifuge rotor is slid on, so that vertical play between the centrifuge rotor and the drive shaft is minimized.
  • the actuating means is designed as a push button which is designed to be biased against the actuating direction. This makes unlocking particularly easy and ergonomic.
  • the actuating means is on the centrifuge rotor.
  • the drive shaft can be made compact.
  • the actuating means could also be on the drive shaft.
  • connection construction provides a snap-in connection, the locking taking place within the framework of a clip connection, which is designed to be detachable. This makes the locking particularly secure and the security that is audible for the user makes it very easy to understand the security.
  • connection structure 10 according to the invention is shown in a preferred embodiment in different views.
  • the connecting structure 10 between a centrifuge rotor 12, which is only partially shown, and a drive shaft 14, which is only partially shown, of a centrifuge motor has eight spring elements 16 as first locking elements 16, which are arranged on a common spring collar 18.
  • This spring collar 18 is screwed concentrically to the drive shaft 14 by means of a screw 20, so that the spring elements 16 extend equally spaced from a cylindrical section 22 of the drive shaft 14.
  • the spring elements 16 have projections 24 which form feet 26, the base 28 of which in FIG Fig. 6 shown relaxed state of the spring elements 16 with respect to a radial plane with respect to the shaft axis W. Furthermore, the projections 24 have bevels 30 which run inclined to the longitudinal extent of the respective spring element 16.
  • the spring elements 16 are connected to the spring ring 18 via joints 32, which allow an elastically reversible displacement of the feet 26 towards the shaft axis W.
  • the spring elements 16 are made in one piece with the spring ring 18 and are made, for example, from a thermoplastic or a spring steel.
  • the spring elements 16 thus form lever arms acting as first locking elements, which are designed to be pivotable relative to the spring ring 18 via the respective joints 32
  • a radially extending step 36 At the transition between the cylindrical section 22 and the conical section 34 of the drive shaft 14 there is a radially extending step 36, the radial depth of which corresponds at least to the radial width of the feet 26, so that the feet 26 are completely on or behind the course of the conical profile of the conical section 34 can be shifted.
  • the hub 38 of the centrifuge rotor 12 has a receiving space 39 for the drive shaft 14 with an incorporated hexagon socket 40, which corresponds to a corresponding hexagon socket 42 of the drive shaft 14 and is used for torque transmission.
  • This hexagon socket 40 is preferably made of a hard material than the hub 38 and is fixed in this hub 38, for example screwed or shrunk.
  • the transmission of the torque from the drive shaft 14 to the centrifuge rotor 12 thus takes place via a positive connection 40, 42 a drive pin-groove connection or other form-fitting connections that allow torque transmission.
  • the hub 38 also has an inner cone 44, which corresponds to the conical section 34 of the drive shaft 14 and serves the perfectly aligned seat of the centrifuge rotor 12 on the drive shaft 14 and a frictional connection.
  • This inner cone 44 merges into an inner cylinder 46, the diameter of which is at least the outer diameter corresponds to step 36, but is preferably larger, being smaller than the outer diameter of feet 26 in the relaxed state of spring elements 16.
  • step 48 there is an annular step 48 above the inner cylinder 46 which is delimited radially outside by a vertical edge 50 which belongs to a circumferential elevation 52 which surrounds the step 48.
  • This step 48 forms the second locking element.
  • the edge 50 surrounds an inner diameter that is only slightly larger than the outer diameter of the feet 26 in the relaxed state. This ensures secure locking and at the same time allows the projections 24 to strike the edge 50 during the sudden relaxation of the spring elements 16.
  • the hub 38 has a cylindrical cavity 54 above the elevation 52, which is delimited at the top by a lid-shaped closure element 56.
  • this closure element 56 which can for example be screwed into the hub 38, there is an opening 58 in which the actuating element 60 is slidably received.
  • the actuating element 60 has a body 62 in the form of a push button 62, which in its lower section has a collar 64 which projects radially outwards and, when the actuating element 60 is not pressed in, bears on the closure element 56.
  • the elevation 52 merges radially on the outside into a depression 66.
  • a spiral spring 68 is arranged in this recess 66 on the one hand and between the section 69 of the body 62 projecting from the collar 64 and the outer circumference of the cavity 54 on the other hand and biases the actuating element 60 in an upward direction, that is to say counter to the actuating direction B of the actuating element 60.
  • the spiral spring 68 thereby provides an automatic return of the actuating element 60 from the actuated to the non-actuated state.
  • the spring elements 16 are displaced inward by continuously pushing the hub 38 onto the drive shaft 14 to such an extent that they can penetrate into the inner cylinder 46, whereby in extreme cases the spring elements 16 can be pivoted in as far as the cylindrical section 22, so that the feet 26 can be moved completely onto or behind the course of the conical profile of the conical section 34 and the step 36.
  • the spring elements 16 can relax, the projections 24 automatically shifting outward due to their pretension until they touch the edge 50 concerns.
  • the feet 26 are supported on the step 48 so that the drive shaft 14 can no longer be pulled out of the hub 38.
  • the spring elements 16 are driven with the feet 26 radially outward with respect to the shaft axis W by the acting centrifugal forces, so that this locking is self-locking during operation.
  • the projection 48 has an inclination corresponding to the inclination of the base 28 of the feet 26.
  • the feet 26 can be displaced early on when the centrifuge rotor 12 is pushed onto the drive shaft 14, so that excessive vertical play between the feet 26 and the projection 48 and thus vertical "rattling" of the hub 38 on the drive shaft 14 are prevented.
  • the push button 62 In order to release the lock, the push button 62 must be shifted downwards in the actuation direction B. As a result, the contact surface 72 on the section 69 of the body 62 projecting from the collar 64, which runs in the direction of the shaft axis W, is brought into contact with the counter-contact surface 74, which is arranged on the spring element 16 and therefore runs inclined with respect to the shaft axis W (cf. . Fig. 3 , The pivoting of the spring elements 16 inwards towards the cylindrical section 22 of the drive shaft 14 is not shown here for drawing reasons, but it actually takes place).
  • the opening 58 has a section 76 with a conical inclination, which corresponds to a conical counter section 78 of the actuating element 60. This effectively prevents the actuating element 60 from tilting when being moved by the spiral spring 68 against the actuating direction B.
  • first locking elements 16 were described as lever arms 16 with projections 24 and feet 26 formed thereby, this is only one possible exemplary embodiment.
  • the spring elements 16 could also be formed without projections 24 and feet 26. This is advantageous if the spring elements 16 are made of spring steel, because then the formation of the projections 24 and feet 26 is more complicated in terms of production technology than a formation without these elements.
  • the locking with the second locking element 48 would then take place very simply via ends (not shown) of the lever arms 16 which are running straight out.
  • FIG. 7 A laboratory centrifuge 100 is shown, which is equipped with the connection structure 10 according to the invention.
  • this laboratory centrifuge 100 is designed in the usual way and has a housing 102 with an operating panel 106 arranged on its front 104 and a cover 108 which is provided for closing the centrifuge container 110.
  • a swing-out rotor 12 which can be driven by the drive shaft of a centrifuge motor (both not shown), is arranged in the centrifuge container 110 as a centrifuge rotor.
  • spring elements 16 were used on the drive shaft 14
  • spring elements which are arranged in the hub can also be used.
  • actuating element 60 does not necessarily have to be arranged on the hub 38 of the centrifuge rotor 12, it can also be arranged on the drive shaft 14.
  • connection structure 10 between the centrifuge rotor 12 and the drive shaft 14 of a laboratory centrifuge 100, by means of which one-hand operation is possible, for which no additional tools are required.
  • the connecting structure 10 is constructed in such a way that the locking 16, 48 is always ensured, wherein locking elements 16, 48 cannot be jammed or blocked.
  • the lock 16, 48 is securely displayed to the user by a clear clicking sound.

Landscapes

  • Centrifugal Separators (AREA)
EP18213731.5A 2018-12-18 2018-12-18 Construction de connexion Pending EP3669993A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP18213731.5A EP3669993A1 (fr) 2018-12-18 2018-12-18 Construction de connexion
PCT/EP2019/085429 WO2020127104A1 (fr) 2018-12-18 2019-12-16 Système de raccordement
CN201980091559.0A CN113412159B (zh) 2018-12-18 2019-12-16 连接结构
JP2021535204A JP7250140B2 (ja) 2018-12-18 2019-12-16 接続構造
US17/414,364 US20220072566A1 (en) 2018-12-18 2019-12-16 Connection construction

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP18213731.5A EP3669993A1 (fr) 2018-12-18 2018-12-18 Construction de connexion

Publications (1)

Publication Number Publication Date
EP3669993A1 true EP3669993A1 (fr) 2020-06-24

Family

ID=64745989

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18213731.5A Pending EP3669993A1 (fr) 2018-12-18 2018-12-18 Construction de connexion

Country Status (5)

Country Link
US (1) US20220072566A1 (fr)
EP (1) EP3669993A1 (fr)
JP (1) JP7250140B2 (fr)
CN (1) CN113412159B (fr)
WO (1) WO2020127104A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022103577A3 (fr) * 2020-11-10 2022-06-23 Fiberlite Centrifuge Llc Rotor à vitesse ultra-élevée

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017130787A1 (de) * 2017-12-20 2019-06-27 Eppendorf Ag Zentrifugenrotor
EP3669992A1 (fr) * 2018-12-18 2020-06-24 Eppendorf AG Construction de connexion

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1983004379A1 (fr) * 1982-06-09 1983-12-22 Beckman Instruments, Inc. Assemblage d'attache d'un rotor de centrifugeuse
US20080146429A1 (en) * 2006-12-13 2008-06-19 Thermo Electron Corporation Rotor assembly and method of connection thereof
DE102008045556A1 (de) * 2008-09-03 2010-03-04 Thermo Electron Led Gmbh Zentrifuge mit einem Kupplungselement zur axialen Verriegelung eines Rotors
WO2011001729A1 (fr) * 2009-06-30 2011-01-06 株式会社久保田製作所 Séparateur centrifuge, rotor pour séparateur centrifuge

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2727037A1 (fr) * 1994-11-21 1996-05-24 Jouan Centrifugeuse a rotor demontable et a dispositif de blocage axial du rotor sur l'arbre d'entrainement
DE102013107681B4 (de) * 2013-07-18 2018-02-08 Andreas Hettich Gmbh & Co. Kg Zentrifuge
DE102014112501B4 (de) * 2014-08-29 2017-07-27 Andreas Hettich Gmbh & Co. Kg Zentrifuge
EP3669992A1 (fr) * 2018-12-18 2020-06-24 Eppendorf AG Construction de connexion

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1983004379A1 (fr) * 1982-06-09 1983-12-22 Beckman Instruments, Inc. Assemblage d'attache d'un rotor de centrifugeuse
US20080146429A1 (en) * 2006-12-13 2008-06-19 Thermo Electron Corporation Rotor assembly and method of connection thereof
DE102008045556A1 (de) * 2008-09-03 2010-03-04 Thermo Electron Led Gmbh Zentrifuge mit einem Kupplungselement zur axialen Verriegelung eines Rotors
WO2011001729A1 (fr) * 2009-06-30 2011-01-06 株式会社久保田製作所 Séparateur centrifuge, rotor pour séparateur centrifuge

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022103577A3 (fr) * 2020-11-10 2022-06-23 Fiberlite Centrifuge Llc Rotor à vitesse ultra-élevée

Also Published As

Publication number Publication date
WO2020127104A1 (fr) 2020-06-25
CN113412159A (zh) 2021-09-17
CN113412159B (zh) 2023-09-05
JP7250140B2 (ja) 2023-03-31
JP2022514582A (ja) 2022-02-14
US20220072566A1 (en) 2022-03-10

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