EP3110557B1 - Zentrifuge - Google Patents

Zentrifuge Download PDF

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Publication number
EP3110557B1
EP3110557B1 EP15712805.9A EP15712805A EP3110557B1 EP 3110557 B1 EP3110557 B1 EP 3110557B1 EP 15712805 A EP15712805 A EP 15712805A EP 3110557 B1 EP3110557 B1 EP 3110557B1
Authority
EP
European Patent Office
Prior art keywords
support plate
motor
centrifuge
centrifuge according
elements
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.)
Active
Application number
EP15712805.9A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3110557A1 (de
Inventor
Klaus-Günter Eberle
Erik Rainer Gerlach
Fritz Walter Bernd Fiedler
Christoph Pabst
Marcellus Geiselmann
Armin Brendle
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.)
Andreas Hettich GmbH and Co KG
Original Assignee
Andreas Hettich GmbH and Co KG
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 Andreas Hettich GmbH and Co KG filed Critical Andreas Hettich GmbH and Co KG
Priority to PL15712805T priority Critical patent/PL3110557T3/pl
Publication of EP3110557A1 publication Critical patent/EP3110557A1/de
Application granted granted Critical
Publication of EP3110557B1 publication Critical patent/EP3110557B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • B04B9/12—Suspending rotary bowls ; Bearings; Packings for bearings
    • 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
    • B04B9/14—Balancing rotary bowls ; Schrappers

Definitions

  • the invention relates to a centrifuge specified in the preamble of claim 1 species,
  • centrifuges in many forms known. Especially with laboratory centrifuges, efforts have always been made to propose devices which are as compact as possible, since the space available in laboratories is often limited. In addition, laboratory centrifuges are usually loaded and unloaded from above and therefore above the devices sufficient space must be available to open the lid.
  • a generic centrifuge is from the DE 39 22 744 A1 known and has a rotor for receiving containers with centrifuging. Via a drive shaft, the rotor is driven, for which the drive shaft is connected to a motor.
  • the motor with drive shaft and rotor are connected to a bearing unit which has a plurality of damping elements comprising a spring axis. The whole is connected to a support member for fixing the motor in the centrifuge.
  • the spring axes of the damping elements can be employed at an acute angle ⁇ to the axis of rotation Y of the motor.
  • the damping elements are each connected via a strut with the bearing unit.
  • the struts are employed and arranged so that they are concentrically aligned with the respective spring axis of the damping elements.
  • the bearing unit comprises a support plate and cooperates with spring elements in addition to the damping elements.
  • the DE 195 16 904 A1 discloses a laboratory centrifuge with a vibration damping device
  • the object of the present invention is to provide, while avoiding the disadvantages mentioned, a centrifuge, in particular a laboratory centrifuge, which is mounted so that the damping elements are optimally loaded and improved damping is achieved.
  • the invention is based on the finding that in imbalance no tilting movement of the rotor takes place, but a wobbling motion.
  • an up and down movement has always been assumed due to the upward and downward movement of the rotor observed during operation.
  • the forces do not act parallel to the axis of rotation. Rather, it concerns forces whose vectors are employed obliquely to the axis of rotation.
  • the centrifuge has a rotor for receiving containers with Zentrifugiergut, a drive shaft on which the rotor is mounted, a motor which drives the rotor via the drive shaft, a bearing unit with a respective spring axis comprising damping elements and a support member for fixing the Engine over the storage unit in the centrifuge.
  • the spring axes of the damping elements are employed at an acute angle ⁇ to the axis of rotation of the motor. Since forces arising from the rotation of the rotor, especially in the occurrence of imbalance, resulting vibration, also act at an acute angle to the axis of rotation of the motor, this alignment of the damping elements has the advantage that the forces acting on the damping elements then mainly train and pressure forces are. Forces that place more strain on the damping elements and result in faster wear, such as shear forces, are minimized or eliminated by this arrangement. So can the life of the Damping elements are easily increased significantly and the damping can be significantly improved.
  • the bearing unit comprises a plurality of struts, preferably 3 to 21, which are connected to the damping elements and which are employed and arranged so that they are aligned concentrically with the respective spring axis. Due to the enlarged diameter at the bottom of the bearing unit a higher stability and thus an improved damping effect for the rotor are achieved.
  • the storage unit has a fixedly connected to the motor upper support plate and a firmly connected to the support member lower support plate.
  • the bearing unit is stiffened and can better absorb and derive forces originating from the centrifuge.
  • the upper support plate and the struts are connected to each other via first spring elements.
  • the angle ⁇ is in the range of 10 ° to 42 °, since experience shows that the forces originating from an imbalance and originating from the centrifuge act at an angle within this range with respect to the axis of rotation of the motor. Thus, a large part of these forces can be passed as tensile or compressive forces in the damping elements, and shear and bending forces are significantly reduced. This further reduces harmful loading of the damping elements and increases their life.
  • angle ⁇ is in the range of 15 ° to 25 °, since, as has been shown in numerous simulations, especially in laboratory centrifuges, the forces emanating from the centrifuge usually work in an angle lying within this range. This reduces the life of the damping elements detrimental shear and bending forces to a minimum,
  • the damping elements between the struts and the lower support plate are arranged. Due to the increased spacing of the damping elements and the increased diameter change the leverage ratios in the bearing unit so that an improved damping effect is achieved.
  • damping elements for example spring bearings, hydraulic bearings or magnetic bearings.
  • damping elements for example spring bearings, hydraulic bearings or magnetic bearings.
  • rubber-metal elements has proven to be advantageous as a damper, since they are space-saving and inexpensive.
  • the lower support plate and the damping elements are connected to each other via second spring elements. Again, a portion of the forces originating from the centrifuge is absorbed by the second spring elements, and due to the uniform distribution of the spring elements over the circumference of the lower carrier plate, the forces are delivered evenly to this. This improves the damping effect of the bearing element again.
  • the mass element is connected by third spring elements with the struts, the mass element on the one hand stabilize the damping elements by its mass and on the other hand, similar to the upper and lower support plate, record horizontally extending forces and amplitude excursions and forward from strut to strut. As a result, the rigidity of the bearing element is further increased and the damping of the system is further improved.
  • the mass element comprises two disk-shaped ground plates and an intermediate fixing plate.
  • the disc-shaped design ensures optimal distribution of the mass and a small footprint.
  • the structural separation between ground plates and fixing plate causes a simpler construction, since the struts need only be connected to the relatively thin fixing plate.
  • the first, second and / or third spring elements are formed as tabs which project from the associated plate, such as the upper support plate, the lower support plate and / or the fixing plate, and are elastically movable.
  • the connection between the plates and the struts or the damping elements is simplified. This facilitates in particular the assembly of the storage unit,
  • the tabs and the associated plates are made of metal. In the production, it is therefore possible to choose from a large number of metals and alloys and to respond well to the respective structural requirements of the centrifuge.
  • the upper support plate, the lower support plate and / or fixing plate are formed as an annular disc. Ring washers are easy to manufacture, and a uniform distribution of the struts or the damping elements over its circumference is easy to implement. This results in a good distribution of deflected over the tabs on the respective plates forces. The bearing element gains thereby stability and damping performance.
  • At least one plate with its associated tabs is integrally formed by the upper support plate, the lower support plate and the fixing plate and in particular is formed of metal, preferably made of sheet steel.
  • the tabs can be produced in a stamping and bending process with the carrier plate. Furthermore, results from the integral formation of plate and tabs improved stability of the bearing element.
  • the motor may include mounting feet projecting from the motor housing, spaced equidistantly about the motor housing and through which the motor is fixedly connected to the bearing unit.
  • the motor is connected via the mounting feet with the upper support plate, wherein between the mounting feet tabs of the upper support plate are provided.
  • Fig. 1 a laboratory centrifuge 10 is shown in side view. For better visibility of the invention essential elements is omitted in this and the other figures on the presentation of the centrifuge housing.
  • a motor 18 which is at the same time the axis of rotation of the centrifuge 10, located at the upper end of a rotor 12 which receives container with centrifuging.
  • the rotor 12 is supported on a motor shaft 14 which is driven by the underlying motor 18.
  • the motor 18 is surrounded by a motor housing 24.
  • the motor shaft 14 is via an upper bearing 16 and on the side facing the bearing a motor shaft 14 enclosing the lower bearing 22, see Fig. 5 , rotatably mounted in the motor housing 24.
  • the motor shaft 14 is rotatably connected in a known manner with the rotor 12, for example via a Dahlnutprofil not shown here.
  • the motor housing 24 On the side facing away from the rotor 12 side of the motor 18, the motor housing 24 is provided with equally spaced mounting feet 20, via which the motor 18 is fixedly connected to an upper support plate 32 of a bearing unit 30.
  • the bearing unit 30 is used to support the motor 18 and the damping of forces resulting from the rotation of the rotor 12.
  • a lower support plate 38 On the side facing away from the motor 18 side of the bearing unit 30 is a lower support plate 38. On the lower support plate 38 are provided as damping elements inclined rubber-metal elements 36, which in turn fixed at about the same angle struts 34 with the upper support plate 32 are connected. With respect to the longitudinal axis Y are as angles of incidence ⁇ for the rubber-metal elements 36 and the associated struts 34 in principle angles between 10 ° and 42 ° advantageous because the forces based on imbalance, upon rotation of the rotor 12 in the region of this Angle act. For the present embodiment of the centrifuge 10, an angle of incidence ⁇ of 21 ° has proven particularly suitable.
  • a mass member 40 is provided, which is fixedly connected to the struts 34 and the rubber-metal elements 36.
  • Fig. 2 shows a perspective view of the centrifuge 10, which is arranged here on a support member 54.
  • a first elastic tab 48 can be seen between each pair of mounting feet 20, each receiving the upper support plate 32 facing the end of a strut 34 and the respective strut 34 resiliently connects to the upper support plate 32.
  • the first elastic tabs 48 may also be separate components that are welded to the upper support plate 32, for example. However, it increases the stability of the bearing unit 30 when the first elastic tabs 48, as in the illustrated embodiment, are formed integrally with the upper support plate 32 and the same material as the upper support plate 32, for example by a punching and bending process.
  • the lower boundary of the bearing element 30 is formed by a lower support plate 38, which is connected via second elastic tabs 50 with the rubber-metal elements 36. Between the lower support plate 38 and the upper support plate 32 is the mass element 40.
  • the mass element 40 consists of three superimposed plates.
  • a fixing plate 44 is arranged, which is resiliently connected via third elastic tabs 52 with the rubber-metal elements 36 and with the struts 34.
  • a disk-shaped upper ground plate 42 and a disk-shaped lower ground plate 46 are arranged, both of which are fixedly connected to the fixing plate 44.
  • the second elastic tabs 50 and the third elastic tabs 52 are formed in this embodiment, analogous to the first elastic tabs 48 integral with the respective associated lower support plate 38 and the fixing plate 44 and the same material as the respective associated plate.
  • the bearing unit is connected via the lower support plate 38 by screw 56 fixed to the support member 54.
  • the support member 54 has at its four corners legs 58, with which the centrifuge 10 is on the ground.
  • the rubber-metal elements 36 may for example be attached directly to the upper support plate 32.
  • the rubber-metal elements 36 by the struts 34 from the upper support plate 32 spaced.
  • the mass member 40 in FIG Fig. 3 only shown by the fixing plate 44 is provided.
  • first elastic tabs 48 which connect the struts 34 fixed to the upper support plate 32, and formed in the fixing plate 44 third elastic tabs 52, the fixing plate 44 fixed to the struts 34 and the rubber-metal Connect elements 36, act as the second elastic tabs 50 as spring elements and increase the damping effect of the bearing unit 30 again.
  • the forces to be absorbed are introduced, in particular via the third elastic tabs 52, between the struts 34 into a horizontal plane, into the mass element 40.
  • Fig. 4 is a view from above of the bearing element 30 is shown.
  • the not clearly recognizable from this perspective five struts 34 are bolted to the first elastic tabs 48 by hexagon screws 60.
  • the number of struts 34 can be varied according to the respective requirements.
  • the upper support plate 32 has five holes 62 for screwing the mounting feet 20 of the motor 18 with the upper support plate 32. This will be in Fig. 5 explained.
  • Fig. 5 shows a schematic representation of a vertical section of the centrifuge 10. In contrast to Fig. 1 Here, the rotor 12 and two struts 34 are not shown for clarity. In this section, individual connections are illustrated.
  • the mounting feet 20 of the motor 18 are screwed by screw-nut connections 64 with the upper support plate 32.
  • 20 holes 66 are provided in the mounting feet and holes 62 in the upper support plate 32, which are associated with each other.
  • the fixed connection between the upper support plate 32 and the struts 34 is achieved by the screwing of the hexagon screws 60 through mutually associated holes 70 in the first elastic tabs 48 and holes 72 in the upper support plate 32 facing ends of the struts 34.
  • the fixed connection between the fixing plate 44 and the struts 34 and the rubber-metal elements 36 is made by each one provided on the motor 18 side facing the rubber-metal elements 36 provided pin 74 through an associated bore 76 in the third elastic tab 52 passes and engages in an associated bore 78 in the strut 34. Due to the weight of the centrifuge 10 and the oblique position of the struts 34 and the rubber-metal elements 36, the positive connection between pin 74 and holes 76 and 78 is sufficiently stable.
  • the fixed connection between the rubber-metal elements 36 and the lower support plate 38 is achieved by screwing screws 80 through mutually associated bores 82 in the second elastic tabs 50 and bores 84 in the rubber-metal elements 36.
  • the fixed connection between the fixing plate 44, the upper ground plate 42 and the lower ground plate 46 is made by screw-nut connections 86, wherein in each case a screw a provided in the upper mass plate 42 bore 88, a provided in the fixing plate 44 bore 90 and provided in the lower ground plate 46 bore 92 passes through and is fixed with the associated nut.

Landscapes

  • Centrifugal Separators (AREA)
EP15712805.9A 2014-02-25 2015-02-23 Zentrifuge Active EP3110557B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL15712805T PL3110557T3 (pl) 2014-02-25 2015-02-23 Wirówka

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014102472.9A DE102014102472B4 (de) 2014-02-25 2014-02-25 Zentrifuge
PCT/EP2015/053752 WO2015128296A1 (de) 2014-02-25 2015-02-23 Zentrifuge

Publications (2)

Publication Number Publication Date
EP3110557A1 EP3110557A1 (de) 2017-01-04
EP3110557B1 true EP3110557B1 (de) 2019-04-10

Family

ID=52774168

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15712805.9A Active EP3110557B1 (de) 2014-02-25 2015-02-23 Zentrifuge

Country Status (7)

Country Link
US (1) US10335804B2 (ja)
EP (1) EP3110557B1 (ja)
JP (1) JP6491219B2 (ja)
CN (1) CN106102922B (ja)
DE (1) DE102014102472B4 (ja)
PL (1) PL3110557T3 (ja)
WO (1) WO2015128296A1 (ja)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014102472B4 (de) * 2014-02-25 2021-04-22 Andreas Hettich Gmbh & Co. Kg Zentrifuge
DE102014116527B4 (de) * 2014-11-12 2020-01-23 Andreas Hettich Gmbh & Co. Kg Zentrifuge und Verfahren zur Erfassung von Unwuchten in der Zentrifuge
CN109435800A (zh) * 2018-12-21 2019-03-08 安徽工程大学 低频隔振座椅
DE102020113765A1 (de) 2020-05-20 2021-11-25 Andreas Hettich Gmbh & Co. Kg Zentrifuge

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Also Published As

Publication number Publication date
CN106102922A (zh) 2016-11-09
JP6491219B2 (ja) 2019-03-27
EP3110557A1 (de) 2017-01-04
PL3110557T3 (pl) 2019-10-31
DE102014102472B4 (de) 2021-04-22
JP2017509475A (ja) 2017-04-06
US10335804B2 (en) 2019-07-02
CN106102922B (zh) 2019-12-31
WO2015128296A1 (de) 2015-09-03
US20170008013A1 (en) 2017-01-12
DE102014102472A1 (de) 2015-08-27

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