Centrifuge and swing bucket rotor

Abstract

A centrifuge includes a swing rotor. Rotor arms of the swing rotor have recesses into which hangers of the swing rotor at least partially swing in a swung-out state. As a result, the centrifuge container and thus also the centrifuges are more compact, because the swinging-out requires less space. An inertial mass of the swing rotor is reduced due to the recesses provided therein, whereby energy consumption, primarily when starting the centrifuge, is significantly reduced.

Claims

1. A centrifuge, comprising: a swing rotor, the swing rotor having a rotor base body with rotor arms that open into arm branches at outer ends, and are connected to a rotor hub at inner ends for coupling the swing rotor to a drive; and hangers mounted so as to swing out between two of the rotor arms, the rotor arms having recesses into which the hangers and/or sample containers stored therein swing into in a swung-out state, wherein two retaining pins are arranged on each of the arm branches and wherein the hangers include pin receivers matching the retaining pins, the pin receivers and the retaining pins jointly forming pivot bearings, and wherein the recesses extend along the rotor arms between their inner ends and their outer ends at a distance from the pivot bearings, and wherein the recesses cover a region of the rotor arms which, with respect to a radius of the swing rotor, is located half-way between an axis of rotation of the swing rotor and a mounting of the hangers.

2. The centrifuge according to claim 1, wherein the hangers are buckets which are provided with lids, and wherein the lids swing into the recesses when the hangers are in the swung-out state.

3. The centrifuge according to claim 1, wherein the recesses are configured as grooves.

4. The centrifuge according to claim 1, wherein the recesses have a rounded cross-sectional shape and wherein the recesses cover a region of the rotor arms that is radially half way between an axis of rotation of the swing rotor and an axis of rotation of the pivot bearings.

5. The centrifuge according to claim 1, wherein the recesses extend over a length along the rotor arms which is shorter than a distance between the rotor hub and a mounting of the hangers.

6. The centrifuge according to claim 1, wherein the recesses extend over a height across the rotor arms which is smaller than a height of the rotor arms at the recesses, and wherein the recesses are bounded by upper and lower webs.

7. The centrifuge according to claim 1, wherein two recesses arranged on different sides of the rotor arms are connected by a through hole.

8. The centrifuge according to claim 1, wherein the rotor arms have a smaller cross sectional thickness at a location of the recesses than in regions outside the recesses.

9. The centrifuge according to claim 1, wherein the swing rotor has at least three of the rotor arms and at least three of the hangers mounted between the at least three rotor arms.

10. The centrifuge according to claim 1, wherein the swing rotor has four of the rotor arms and four of the hangers mounted between the four rotor arms.

11. A swing rotor for a centrifuge, comprising: a rotor base body with rotor arms that open into arm branches; a rotor hub for coupling the swing rotor to a drive; two retaining pins arranged on each of the arm branches; and buckets mounted so as to swing out between two of the rotor arms, wherein the buckets include pin receivers matching the retaining pins, the pin receivers and the retaining pins jointly forming pivot bearings, wherein the rotor arms have recesses into which the buckets and/or sample containers stored therein swing into in a swung-out state, the recesses being arranged at a distance from the pivot bearings, and wherein the recesses cover a region of the rotor arms which, with respect to a radius of the swing rotor, is located half-way between an axis of rotation of the swing rotor and a mounting of the buckets.

12. The swing rotor according to claim 11, wherein the recesses are grooves.

13. The swing rotor according to claim 11, wherein the recesses extend over a length along the rotor arms which is shorter than a distance between the rotor hub and a mounting of the buckets.

14. The swing rotor according to claim 11, wherein the recesses extend over a height across the rotor arms which is smaller than a height of the rotor arms at the recesses, and wherein the recesses are bounded by upper and lower webs.

15. The swing rotor according to claim 11, wherein two recesses arranged on different sides of the rotor arms are connected by a through hole.

16. The swing rotor according to claim 11, wherein the rotor arms have a smaller cross sectional thickness at a location of the recesses than in regions outside the recesses.

17. The swing rotor according to claim 11, wherein the swing rotor has at least three of the rotor arms and at least three of the buckets mounted between the at least three rotor arms.

18. The swing rotor according to claim 11, wherein the swing rotor has four of the rotor arms and four of the buckets mounted between the four rotor arms.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a perspective view of a centrifuge.

(2) FIG. 2 is a top view of a swing rotor for the centrifuge as in FIG. 1 in a non-swung-out state of the hangers.

(3) FIG. 3 is a cross sectional view showing the swing rotor as in FIG. 2 in a swung-out state of the hangers.

(4) FIG. 4 is a perspective view of a rotor base body of the swing rotor as in FIG. 2.

(5) FIG. 5 is a perspective sectional view of the rotor base body shown in FIG. 4.

(6) FIG. 6 is a sectional view showing an alternative embodiment of a swing rotor in a swung-out state of the hangers.

(7) FIG. 7 is a detail view of the swing rotor shown in FIG. 6 illustrating sample containers sliding into recesses.

DETAILED DESCRIPTION

(8) FIGS. 1 to 5 show a first example of a centrifuge 10 with a swing rotor 12 inserted therein.

(9) The centrifuge 10 is configured as a laboratory centrifuge, which has a housing 14 with a lid 16. In the centrifuge container 18 of the centrifuge 10, the swing rotor 12 is arranged on a drive shaft (not shown) of a centrifuge motor (not shown).

(10) The swing rotor 12 has a rotor base body 20 having a hub 22 which is coupled via screws 23 with the drive shaft. The rotor base body 20 has four rotor arms 24, which are each arranged on the hub 22 offset in the circumferential direction 90° to each other. The rotor arms 24 open into arm branches 26, at each of which two retaining pins 28 are arranged. Oppositely arranged retaining pins 28, 28′ of two oppositely arranged arm branches 26, 26′ are aligned so that they lie in a line and thus form a swing-out axis A.

(11) Hangers 30 are configured as a bucket 32 and provided with lids 34. In these buckets 32, samples are accommodated in sample containers or sample carriers. The sample containers or sample carriers are optionally arranged in adapters (all not shown). The samples can be centrifuged with the aid of the centrifuge 10.

(12) The hangers 30 have pin receivers 36 which have an upper stop 38 and two lateral guides 40. The hangers 30 can be arranged on the retaining pins 28 with the help of these pin receivers 36. In this case, the upper stops 38 rest on the retaining pins 28 and the lateral guides 40. Together with a configuration of the pin receivers 36 matching the shape of the retaining pins 28, they form a pivot bearing 41 about the swing-out axis A, so that the hangers 30 can swing out from a non-swung-out position shown in FIG. 2 into a swung-out position shown in FIG. 3 around the swing-out axis A.

(13) The non-swung-out position, in which the hanger longitudinal axis L extends parallel to an axis of rotation D of the swing rotor 12, is assumed by the hanger 30 during standstill of the swing rotor 12. The swung-out position, in which the hanger longitudinal axis L extends approximately perpendicular to the axis of rotation D of the swing rotor 12, is assumed by the hanger 30 during a sufficiently high rotary speed during operation of the swing rotor 12.

(14) The rotor arms 24 have, starting from the hub 22, a slightly conically tapered cross-section, wherein the thickness B is constant over the entire height H, except for the regions in which the recesses 42 are provided. The thickness B′ is significantly reduced there, as can be seen particularly well in FIG. 5. These recesses 42 extend over a region which is half-way between the swing-out axis A and the axis of rotation D in relation to the radius of the swing rotor 12.

(15) The recesses 42 are configured fluted and rounded and the lid 34 of the bucket 32 can swing into them in the swung-out state, as can be seen in FIG. 3.

(16) Due to the fact that the recesses 42 are bounded above and below by webs 44, a high rigidity and stability remains ensured despite the subtraction of material, even at high rotary speeds of the swing rotor 12.

(17) Numerous advantages are achieved through this particular embodiment of the swing rotor 12 having recesses 42 into which the hangers 30 can swing.

(18) On the one hand, the swing-out axes A can be brought closer to the axis of rotation D with identical hangers 30. As a result, the centrifuge container 18 and thus also the centrifuges 10 can be designed essentially more compact, because the swinging-out now requires less space.

(19) On the other hand, instead of a more compact design of the centrifuges 10, the dimensioning of both the centrifuge container 18 and the rotor base body 20 can be maintained and instead the hanger 30 can be enlarged, so that a larger amount of sample can be centrifuged.

(20) In addition, a reduction of the inertial mass of the swing rotor 12 is related to the recesses 42, whereby the energy consumption, primarily when starting the centrifuge 10, is significantly reduced.

(21) As shown, the lid 34 of the hanger 30 swings into the recess 42 in the described embodiment. Alternatively, the swing rotor 12 can also be designed so that the bucket 32 alone or the bucket 32 and lid 34 can swing into the recess together.

(22) On the other hand, in a second preferred embodiment of the swing rotor 50, it is shown that the hanger 52 itself does not have to swing into the recess 42. It can also be provided that a sample container 54 arranged in the hanger 52, in which sample container a sample 56 is located, swings into this recess 42 when swinging out, as can be seen in FIG. 6 and the relevant detail view corresponding to FIG. 7. Even then, the space is made more compact.

(23) From the above description, it has become clear that a centrifuge 10 and a swing rotor 12, 50 are provided, with which the space within the centrifuge 10 can be used significantly better.

(24) While the present invention has been described with reference to exemplary embodiments, it will be readily apparent to those skilled in the art that the invention is not limited to the disclosed or illustrated embodiments but, on the contrary, is intended to cover numerous other modifications, substitutions, variations and broad equivalent arrangements that are included within the spirit and scope of the following claims.