EP3669992A1 - Construction de connexion - Google Patents

Construction de connexion Download PDF

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Publication number
EP3669992A1
EP3669992A1 EP18213729.9A EP18213729A EP3669992A1 EP 3669992 A1 EP3669992 A1 EP 3669992A1 EP 18213729 A EP18213729 A EP 18213729A EP 3669992 A1 EP3669992 A1 EP 3669992A1
Authority
EP
European Patent Office
Prior art keywords
locking element
connecting structure
drive shaft
locking
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
EP18213729.9A
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 EP18213729.9A priority Critical patent/EP3669992A1/fr
Priority to PCT/EP2019/085455 priority patent/WO2020127121A1/fr
Priority to JP2021535182A priority patent/JP7270043B2/ja
Priority to US17/414,369 priority patent/US20220040709A1/en
Priority to CN201980091573.0A priority patent/CN113412160A/zh
Publication of EP3669992A1 publication Critical patent/EP3669992A1/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 mounted so as to be pivotable about an axis. This makes the lever function particularly easy to implement.
  • the first connecting means has at least one chamfer which serves as a locking aid, the chamfer preferably lying parallel to the longitudinal extent of the lever. As a result, the connection structure can be locked particularly easily because the first locking means does not represent an obstacle when the centrifuge rotor is attached to the drive shaft.
  • the first locking element is designed such that centrifugal force causes it to engage the second locking element. This locks itself automatically when the centrifuge is in operation.
  • the first locking element is biased in the direction of engagement with the second locking element.
  • locking can also take place without centrifugal force, that is to say automatically without regard to the operating state 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. If the preload is used in addition to the centrifugal force, then the rotation of the centrifuge rotor increases the locking by the centrifugal force.
  • the first locking element is arranged on the centrifuge rotor.
  • the essential elements can be arranged in the centrifuge rotor, preferably its hub, which improves longevity because the drive shaft itself does not have to have any moving parts for the connection construction.
  • the second locking element is a projection of the drive shaft, which the first locking element engages behind 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 contact surface runs inclined in the axial direction of the shaft axis.
  • levers arranged pivotably about an axis can be unlocked very easily.
  • the counter abutment surface is then best 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 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.
  • the first connecting element would preferably be pretensioned in the direction of engagement with the second locking element.
  • the center of gravity of the first locking element could be arranged in such a way that the locking takes place automatically when the centrifuge rotor is placed on the drive shaft.
  • connection structure 100 is shown in a preferred embodiment in different views.
  • the connecting structure 100 between a centrifuge rotor 102, which is only partially shown, and a drive shaft 104, which is only partially shown, of a centrifuge motor has, as first locking elements 106, three levers 106, which are each pivotably mounted about axes 108.
  • axes 108 are arranged in the hub 110 of the centrifuge rotor 102 such that the levers 106 extend concentrically around a receiving space 112 for the drive shaft 104, with an angular spacing of 120 ° in each case.
  • the levers 106 each have a first lever arm 114 and a second lever arm 116, which are arranged opposite the axis 108, a hook 118 pointing to the shaft axis W being arranged on the first lever arm 114.
  • the receiving space 112 for the drive shaft 104 has a machined hexagon socket 120 which corresponds to a corresponding hexagon socket 122 of the drive shaft 104 and is used for torque transmission.
  • This hexagon socket 120 is preferably made of a hard material than the hub 110 and is fixed in this hub 110, for example screwed or shrunk.
  • the transmission of the torque from the drive shaft 104 to the centrifuge rotor 102 thus takes place via a positive connection 120, 122.
  • a positive connection 120, 122 As an alternative to the hexagonal configuration shown, another polygonal configuration, for example an octagonal configuration, could exist, or the positive connection could be by a tongue and groove connection or also a drive pin-groove connection or other form-fitting connections that allow torque transmission.
  • the hub 110 has an inner cone 124, which corresponds to a conical section 126 of the drive shaft 104 and serves for the perfectly aligned fit of the centrifuge rotor 102 on the drive shaft 104 and for a frictional engagement.
  • This inner cone 124 merges into an inner cylinder 128, which is formed by a 129 bearing block 130 screwed to the hub 110, on which there are arms 131 on which the axes 108 are arranged.
  • Biasing means for example in the form of springs (not shown), may also exist on this bearing block 130, which bias the first lever arms 114 with the hooks 118 toward the shaft axis W.
  • such separate pretensioning means are not provided in the exemplary embodiment shown.
  • the drive shaft 104 has a groove 132 with an upper projection 134 above the conical section 126, a chamfer 136 extending above the upper projection 134. This projection 134 forms the second locking element.
  • the groove 132 has a circumferential configuration in the form of an external hexagon 137, which is aligned parallel to the external hexagon 122. As a result, each hook 118 is always parallel to a surface of the external hexagon 137 assigned to it.
  • the hooks 118 have chamfers 138 which are oriented towards the inner cone 124. In the locked state, the hooks 118 engage in the groove 132 and engage behind the upper projection 134.
  • the hub 110 has a cylindrical cavity 140 above the bearing block 130, which is delimited at the top by a lid-shaped closure element 142.
  • this closure element 142 which can be screwed 143 into the hub 110, for example, there is an opening 144 in which the actuating element 146 is slidably received.
  • the actuating element 146 has a body 148 designed as a push button 148, which in its lower section has a collar 150 which projects radially outwards and, when the actuating element 146 is not pressed in, bears on the closure element 142.
  • a projection 152 is arranged below on the collar 150, a section 154 with a conical inner contour consisting of a conical inner contour at the transition between the body 148 and the projection 152 opposite the collar 150, which section acts as a contact surface which corresponds to a counter-contact surface 156 of the lever 106.
  • the bearing block 130 has an elevation 158 through the cantilevers 131 to form a recess 160 (cf. Fig. 2 ).
  • a spiral spring 162 is arranged in this recess 160 on the one hand and between the projection 152 and the outer circumference of the cavity 140 on the other hand and prestresses the actuating element 146 in the upward direction, that is to say counter to the actuating direction B of the actuating element 146.
  • the coil spring 162 thereby provides an automatic return of the actuating element 146 from the actuated to the non-actuated state.
  • the opening 144 has a section 164 with a conical inclination, which corresponds to a conical counter section 166 of the actuating element 146. This effectively prevents the actuating element 146 from tilting when being moved by the spiral spring 162 against the actuating direction B.
  • connection structure 100 now works as follows: In in Fig. 1 shown state, the centrifuge rotor 102 is placed with its hub 110 on the drive shaft 104 of the centrifuge motor. The hooks 118 with their chamfers 138 come into contact with the chamfer 136 of the drive shaft 104, as a result of which the first lever arm 114 is deflected outward with respect to the shaft axis W until the hooks 118 engage in the groove 132 and thereby engage behind the upper projection 134 ( see. Fig. 2 ). The two chamfers 136, 138 thus provide a locking aid in that they prevent the hooks 118 from tilting or getting caught on the drive shaft 104.
  • the center of mass M of the levers 106 is on the outside and above with respect to the axes 108, so that a snap-in takes place before the operation of the centrifuge rotor 102.
  • the starting position of the lever 106 is limited by the conical inner surface 154 of the actuating element 146.
  • the second lever arms 116 cannot tilt outwards and prevent the centrifuge rotor 102 from being fitted. Tilting inward is also not a problem, since the drive shaft 104 presses these levers 106 back into the correct position when the centrifuge rotor 102 is attached. An inward tilting could, however, also be avoided constructively by appropriate contact points in the bearing block 130 (not shown).
  • the push button 148 In order to release the lock, the push button 148 must be shifted downward in the actuation direction B. As a result, the contact surface 154 becomes a contact with the counter contact surface Brought 156, which runs parallel to the shaft axis W in the non-pivoted state.
  • levers 106 pivotable about an axis 108 were used, levers pivotable about an axis can also be used, which are arranged on the drive shaft.
  • actuating element 146 does not necessarily have to be arranged on the hub 110 of the centrifuge rotor 102, it can also be arranged on the drive shaft.
  • FIG. 7 A laboratory centrifuge 200 is shown which is equipped with the connection structure 10 according to the invention.
  • this laboratory centrifuge 200 is designed in a conventional manner and has a housing 202 with a control panel 206 arranged on its front side 204 and a cover 208 which is provided for closing the centrifuge container 210.
  • a fixed-angle rotor 12 which can be driven by the drive shaft of a centrifuge motor (neither shown), is arranged in the centrifuge container 210 as a centrifuge rotor.
  • connection structure 100 between centrifuge rotor 102 and drive shaft 104 of a laboratory centrifuge 200, by means of which one-hand operation is possible is possible for which no additional tools are required.
  • the connecting structure 100 is constructed in such a way that the locking 118, 132, 134 is always ensured, wherein locking elements 118, 132, 134 cannot be jammed or blocked.

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  • Centrifugal Separators (AREA)
EP18213729.9A 2018-12-18 2018-12-18 Construction de connexion Pending EP3669992A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP18213729.9A EP3669992A1 (fr) 2018-12-18 2018-12-18 Construction de connexion
PCT/EP2019/085455 WO2020127121A1 (fr) 2018-12-18 2019-12-16 Système de raccordement
JP2021535182A JP7270043B2 (ja) 2018-12-18 2019-12-16 接続構造
US17/414,369 US20220040709A1 (en) 2018-12-18 2019-12-16 Connection construction
CN201980091573.0A CN113412160A (zh) 2018-12-18 2019-12-16 连接结构

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP18213729.9A EP3669992A1 (fr) 2018-12-18 2018-12-18 Construction de connexion

Publications (1)

Publication Number Publication Date
EP3669992A1 true EP3669992A1 (fr) 2020-06-24

Family

ID=64745988

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18213729.9A Pending EP3669992A1 (fr) 2018-12-18 2018-12-18 Construction de connexion

Country Status (5)

Country Link
US (1) US20220040709A1 (fr)
EP (1) EP3669992A1 (fr)
JP (1) JP7270043B2 (fr)
CN (1) CN113412160A (fr)
WO (1) WO2020127121A1 (fr)

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
EP3669993A1 (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 (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4014451C1 (fr) * 1990-05-05 1991-06-13 Heraeus Sepatech Gmbh, 3360 Osterode, De
DE202004004215U1 (de) * 2004-03-17 2005-07-28 Hengst Gmbh & Co.Kg Freistrahlzentrifuge für die Reinigung des Schmieröls einer Brennkraftmaschine
DE102015113856A1 (de) * 2015-08-20 2017-02-23 Andreas Hettich Gmbh & Co. Kg Rotor einer Zentrifuge
CN205944498U (zh) * 2016-04-15 2017-02-08 番禺得意精密电子工业有限公司 卡缘连接器
CN207863455U (zh) * 2018-01-25 2018-09-14 华北易安德脚手架制造有限公司 盘扣式脚手架加强横头

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

Also Published As

Publication number Publication date
WO2020127121A1 (fr) 2020-06-25
CN113412160A (zh) 2021-09-17
US20220040709A1 (en) 2022-02-10
JP7270043B2 (ja) 2023-05-09
JP2022514749A (ja) 2022-02-15

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