CENTRIFUGE ROTOR

Description

[0001] The present invention relates to a centrifuge rotor according to the preamble of claim 1.

[0002] Centrifuge rotors are used in centrifuges, particularly laboratory centrifuges, to separate the components of centrifuged samples by utilizing mass inertia. Increasingly higher rotation speeds are used to achieve high separation rates. Laboratory centrifuges are centrifuges whose rotors preferably operate at at least 3,000, preferably at least 10,000, and especially at least 15,000 revolutions per minute and are usually placed on benchtops. To accommodate them on a workbench, they typically have a form factor of less than 1 m × 1 m × 1 m, thus limiting their installation space. The device depth is preferably limited to a maximum of 70 cm.

[0003] In most cases, samples are centrifuged at specific temperatures. For example, samples containing proteins and similar organic substances must not be overheated, so the upper limit for such samples is typically around +40°C. On the other hand, certain samples are typically cooled to +4°C (the anomaly of water begins at 3.98°C).

[0004] In addition to such predetermined maximum temperatures of approximately +40°C and standard test temperatures such as +4°C, other standard test temperatures are also provided, such as +11°C, to check whether the centrifuge's refrigeration system is operating at regulated temperatures below room temperature. On the other hand, for occupational safety reasons, it is necessary to prevent touching elements that have a temperature greater than or equal to +60°C.

[0005] Both active and passive systems can be used for temperature control. Active cooling systems have a refrigerant circuit that regulates the temperature of the centrifuge chamber, thereby indirectly cooling the centrifuge rotor and the sample containers contained therein.

[0006] Passive systems rely on exhaust-assisted cooling or ventilation. This air is passed directly past the centrifuge rotor, thereby controlling the temperature. The air is drawn through openings into the centrifuge chamber, with the suction occurring automatically due to the rotation of the centrifuge rotor.

[0007] The samples to be centrifuged are stored in sample containers, which are then rotated by a centrifuge rotor. The centrifuge rotors are typically driven by a vertical drive shaft powered by an electric motor. Various centrifuge rotors are used depending on the application. The sample containers can contain the samples directly, or they can contain separate sample containers containing the sample, allowing multiple samples to be centrifuged simultaneously in one sample container.

[0008] In general, such centrifuge rotors typically comprise a base and a lid. When the lid is closed, an interior space forms between the base and lid in which the sample vessels can be arranged for centrifuging the samples in a suitable centrifuge. If the sample vessels are arranged at a fixed angle in the centrifuge rotor, this is called a fixed-angle rotor.

[0009] For connection to the centrifuge, the lower part is usually provided with a hub that can be coupled to the motor-driven drive shaft of the centrifuge.

[0010] The lid, in turn, is usually designed to be lockable with the base.

[0011] Typically, an aerosol-tight seal is created between the lid and the base. For example, the Eppendorf ®< fixed-angle rotor FA-45-48-11, which can be used in the Eppendorf ®< 5430 R laboratory centrifuge, has a disc-like lid with a radially outwardly open groove containing an O-ring as a seal. When closed, the lid is inserted into a corresponding, approximately vertical recess in the base and clamped downwards, with the O-ring being wedged between the groove and the side wall of the base to create a seal. The aerosol-tight seal means that the centrifuge containers can be easily transported and manipulated without there being a risk of samples contaminating the centrifuge or the environment.

[0012] The closure between the lid and the base can be designed in different ways.

[0013] Centrifuge rotors are known in which a freely rotatable locking nut is mounted on the lid, and the base has a corresponding thread around the hub. An example of such a centrifuge rotor is the F-45-32-5-PCR model from Eppendorf ® . To close the lid on the base, the lid must be placed onto the thread with the locking nut and screwed into place. This requires two hands: one hand to hold the base, and one hand to place and tighten the locking nut. In addition, the locking nut must be rotated numerous times until the closure is secure, which is quite laborious.

[0014] To reduce this effort, centrifuge rotors are already known which use a type of bayonet lock, so that only about half a turn of a corresponding locking nut is required until the lock is tight. An example of such a centrifuge rotor is the FA-45-18-11 model from Eppendorf ®< . The lock is implemented in the form of a moving thread, the pitch angle of which is selected such that the locking nut with its locking cams automatically rotates shortly before the locking position due to the weight of the lid. In addition, a positive locking mechanism is implemented with the help of a rubber-elastic seal, as described in EP 2 024 097 A1. This means that the lid only needs to be put on with one hand, after which the locking nut rotates automatically until it reaches the locking position.Then, the locking nut only needs to be turned a few degrees further to lock it in place. The rubber-elastic seal, together with a recess in the bayonet-lock slot opposite the locking cam, locks the bolt in place. However, this final step requires two hands.

[0015] EP 3 132 855 A1 discloses a centrifuge rotor with a lid. A handle is arranged on the lid for attaching and removing the lid from the rotor. The locking mechanism between the lid and the rotor is actuated by means of a quick-release fastener, which is secured when the rotor is being carried. The present invention, according to the preamble of claim 1, is based on this centrifuge rotor.

[0016] DE 10 2005 014 218 A1 concerns a centrifuge rotor in which the lid is also locked to the rotor body. In addition, the rotor can be removed from the centrifuge without removing the lid, which allows access to the coupling via a hole.

[0017] It is therefore an object of the present invention to improve the centrifuge rotor with respect to the closure between the lower part of the centrifuge rotor and the lid in such a way that true one-handed operation is possible. In particular, the closure should be able to be closed and released again with just one hand. Preferably, the closure should be structurally simpler and also more cost-effective to manufacture.

[0018] This object is achieved with the centrifuge rotor according to the invention as claimed in claim 1. Advantageous further developments are specified in the subclaims and in the following description together with the figures.

[0019] The inventors realized that this problem can be solved in a surprising and particularly simple way by providing a locking mechanism between the lid and the lower part of the centrifuge rotor in the form of a first undercut, into which a projection engages. Thus, there is a detachable interlock between the lid and the lower part. This allows the lid to be easily attached to and removed from the lower part.

[0020] This projection can be removed from the first undercut to create an open position. The projection can be pre-tensioned to easily create the closed position via the locking mechanism.

[0021] The centrifuge rotor according to the invention has a lower part and a lid, wherein the centrifuge rotor has a rotational axis, wherein the lid can be plugged onto the lower part along the rotational axis in a closing direction and removed along the rotational axis in a releasing direction, wherein in the closed state of the lid there is a closure between the lower part and the lid, and is characterized in that at least one of the elements lower part and lid has at least one first undercut, in which at least one projection engages in the closed state of the lid, which projection is arranged on the other of the elements lid and lower part.

[0022] In an advantageous further development, the first undercut is designed to extend perpendicular to the rotation axis. This ensures particularly secure locking, even during operation of the laboratory centrifuge.

[0023] In an advantageous further development, the first undercut extends completely around the rotation axis. This allows the lid to be arranged on the base in any azimuthal orientation relative to the rotation axis of the centrifuge rotor.

[0024] In an advantageous further development, the projection has a chamfer or rounded portion pointing toward the lower part and / or the first undercut has a chamfer or rounded portion pointing toward the lid. This facilitates the closing process.

[0025] In an advantageous development, a locking aid is provided, preferably in the form of a chamfer or rounded portion, by which the projection is brought into engagement with the first undercut when the lid is placed onto the base. Preferably, the projection has a chamfer or rounded portion facing the base and / or, with respect to the closing direction, a chamfer or rounded portion facing the lid is arranged in front of the first undercut. This allows the lid to be very easily locked onto the base, thereby improving one-handed operation.

[0026] In an advantageous further development, the chamfer has an angle in the range of 20° to 80°, preferably 45° to 75°, in particular 60°, with respect to the rotation axis. This makes the closing aid particularly effective.

[0027] In an advantageous development, the projection has a bevel or curve pointing toward the lid and / or the first undercut has a bevel or curve pointing toward the base. This causes the lid to be pressed against the base during centrifugation. This strengthens the seal between the lid and the base and prevents the lid from wobbling on the base.

[0028] In an advantageous refinement, two projections arranged opposite one another with respect to the rotational axis are provided. This gives the closure a symmetrical design and makes it particularly secure, even at high rotational speeds of the laboratory centrifuge. Three to five symmetrically arranged projections can also be used, which would still allow one-handed operation. However, while the more projections used, the more secure the closure becomes, it also becomes more cumbersome.

[0029] In an advantageous development, the projection has a preload directed toward the first undercut, which is preferably provided by a spring (closing spring), in particular a shaped spring. This allows the locking mechanism to be particularly secure, thus improving one-handed operation.

[0030] According to the invention, the projection is arranged on a lever with a pivot point, with the pivot point preferably being located on the lid. This makes the projection particularly easy to operate.

[0031] In an advantageous refinement, the center of mass of the lever is located above the pivot point with respect to the closing direction. This ensures particularly secure locking even at high centrifuge rotor speeds, because the moments of inertia combined with the centrifugal forces ensure that the projection does not disengage from the first undercut. Furthermore, this relieves the load on any closing spring during centrifugation, increasing its durability.

[0032] In an advantageous development, the lever, which is preferably an injection-molded part, comprises at least two lever parts. This allows the lever to be manufactured with a very low weight, preferably at least partially hollow, thus keeping the weight of the centrifuge rotor low. The lever parts can be injection-molded. Milling or die-casting can also be used as an alternative to injection molding. It also does not necessarily have to be manufactured with a hollow space.

[0033] In an advantageous further development, when the lid is closed, the projection has at least one contact point on the first undercut, the radial distance of which from the axis of rotation of the rotor corresponds at most to the radial distance of the pivot point of the lever from the axis of rotation of the rotor. As a result, when the lid is pulled away from the lower part and during centrifugation, no forces arise that could cause the lock between the lid and lower part to open. Particularly preferably, the radial distance of the contact point from the axis of rotation is identical to the radial distance of the pivot point from the axis of rotation. The contact point then lies perpendicularly below the pivot point. This configuration reduces the lever arm to zero, and during centrifugation no force is generated that would cause the lever to open. As a result, such a force does not need to be compensated for by the spring or centrifugal force during centrifugation.Such a defined attachment point can be created, for example, by slightly rounding the projection in the area of ​​the attachment point.

[0034] In an advantageous further development, at least one side of the spring is anchored inside the lever. This ensures that the spring is mounted particularly securely.

[0035] In an advantageous development, the pivot point has a bearing axis mounted on one side in a blind hole. Two levers are provided, and the corresponding blind holes are arranged rotationally symmetrically with respect to the axis of rotation. This prevents imbalances from occurring during operation. A through hole for the bearing axis is then preferably arranged on the other side.

[0036] According to the invention, the lid has a circular recess for fastening the centrifuge rotor in a centrifuge, wherein the lever has a concave design which continues the circular recess and points towards the axis of rotation, wherein the lever is arranged such that when the lid is closed, the concave design does not protrude inwards into the circular recess. This makes the centrifuge rotor very easy to install in a centrifuge and, at the same time, the locked state of the lid is clearly indicated on the base, thus preventing incorrect operation. By continuing the concave shape of the lid and lever, the closed state of the rotor lid is clearly recognizable, because in the event of an improper closure, this optical continuation no longer exists, which is easily detected by the operator.

[0037] In an advantageous development, the lid has a second undercut that serves as a handle for carrying the centrifuge rotor, with the second undercut preferably projecting from the lid. This allows the centrifuge rotor to be carried very comfortably without the risk of the locking mechanism between the lid and the base being released during carrying. This is further improved by the levers projecting from the second undercut, making it easy to avoid their activation during carrying. In extreme cases, the second undercut can be removed in the area of ​​the levers.

[0038] In an advantageous development, a preferably aerosol-tight seal is provided between the lid and the base after the first undercut, with respect to the closing direction, so that the closure is arranged outside the sample space formed between the lid and the base with respect to the seal. This seal is preferably designed as a sealing element that is clamped between the lid and the base.

[0039] The features and further advantages of the present invention will become clear below from the description of a preferred embodiment in conjunction with the figures. These show, purely schematically: Fig. 1 shows the centrifuge rotor according to the invention according to a first preferred embodiment in a perspective view, Fig. 2 shows the centrifuge rotor according to the invention according to Fig. 1 in a sectional view, Fig. 3 a detailed view of the closure of the centrifuge rotor according to the invention according to Fig. 2 in a sectional view, Fig. 4 a detailed view of the area Y of the closure of the centrifuge rotor according to the invention according to Fig. 3 in a sectional view, Fig. 5 the lower part of the centrifuge rotor according to the invention according to Fig. 1 , Fig. 6 a part of the cover of the centrifuge rotor according to the invention Fig. 1 , Fig. 7 a part of the lever of the centrifuge rotor according to the invention according to Fig. 1 in two different views and Fig. 8 the lever of the centrifuge rotor according to the invention according to Fig. 1 in an overall presentation.

[0040] In the Fig. 1 bis 8 the centrifuge rotor 10 according to the invention and its parts are shown in different views.

[0041] It can be seen that this centrifuge rotor 10 is largely rotationally symmetrical and has a lower part 12 and a cover 14, wherein the cover 14 can be placed on the lower part 12 in a closing direction S parallel to the rotation axis D and can be removed in a release direction L parallel to the rotation axis D.

[0042] The lower part 12 has a series of evenly spaced holes or compartments 16 for receiving sample vessels in the form of, for example, test tubes (not shown). Centrally located in the lower part 12 is a hub 18 with a hole 20 that can accommodate a drive shaft of a laboratory centrifuge (neither shown) to drive the centrifuge rotor 10. A carrying handle 22 with an undercut 23 provided for gripping is formed on the hub 18, projecting from the lid 14. The handle 22 can be used to grasp and carry the centrifuge rotor 10 without removing the lid 14.

[0043] The cover 14 has two levers 24, each with an undercut 25 provided for gripping, wherein the levers 24 are arranged opposite one another and equally spaced with respect to the axis of rotation D.

[0044] A sample chamber 26 is formed between the lower part 12 and the lid 14, which is sealed aerosol-tight by the outer seal 28 and inner seal 30 arranged between the lower part 12 and the lid 14, each of which is rotationally symmetrical with respect to the rotation axis D. From this sample chamber 26, the compartments 16 and thus the individual sample vessels are accessible.

[0045] Furthermore, a closure 32 is formed between the lower part 12 and the cover 14, which Fig. 3 and 4 shown in detailed views.

[0046] It can be seen that the closure 32 is formed by the two levers 24 and an undercut 34 into which the respective projections 36 of the levers 24 engage.

[0047] As in Fig. 5 As can be seen, the undercut 34 is formed continuously in the circumferential direction, thus extending around the rotational axis D, and is open in the radial direction. It is therefore a radially open circumferential groove 34.

[0048] The levers 24 are designed so that their center of mass M is located above the bearing 38 with respect to the release direction L. The bearing is a screw bolt 38 which is screwed into a blind hole 40 with a thread, as Fig. 6 can be removed. This blind hole 40 is arranged in the carrying handle 22, specifically opposite a through hole 42 through which the screw bolt 38 can be screwed into the blind hole 40 by the lever 24. The blind holes 40 are arranged rotationally symmetrically.

[0049] To accommodate the lever 24, the cover 14 has a recess 44 in which the lever 24 is arranged so as to be tiltable about the screw bolt 38. The lever 24 is pre-tensioned with respect to its projection 36 against the undercut 34 by the shaped spring 46, which is supported on the recess 44, as best shown in Fig. 3 can be seen.

[0050] Like the Fig. 7 and 8 As can be seen, the lever 24 is constructed from two injection-molded parts 48 (the connecting seam of the two injection-molded parts 48 is in Fig. 8 not shown), where in Fig. 7 Only one half 48 is shown in two different perspective views. This division is for manufacturing reasons, as it enables plastic injection molding for the levers 24. Thus, the levers 24 can be provided with a cavity 50 to reduce weight without impeding demoldability. As an alternative to injection molding, milling or die casting can also be used. On the other hand, the lever 24 can also be formed in one piece, i.e., without this division.

[0051] Furthermore, the levers 24 have a through-bore 52 for the screw bolts 38. The shaped spring 46 is mounted at one end 54 in a recess 56. The other end 58 is exposed, but is held on both sides by projections 60.

[0052] The projection 36 has a first chamfer 62 pointing towards the lower part 12 and a second chamfer 64 pointing towards the cover 14. In addition, Fig. 7 It can be seen that the inner surfaces 66, 68 are grooved.

[0053] In the Fig. 2 and 4 It can be seen that in the closing direction in front of the undercut 34 on the lower part 12 a first chamfer 70 is formed and the undercut 34 has a second chamfer 72 pointing towards the lower part 12.

[0054] The first chamfer 62 of the projection 36 and the first chamfer 70 of the lower part arranged above the undercut 34 act as a closing aid, since when the cover 14 is pressed in the closing direction S onto the lower part 12, the projection 36 is automatically guided radially outwards from the axis of rotation D against the spring force of the spring 46 and thereby the projection 74 on the lower part 12 is overcome, even without the levers 24 having to be actuated manually.

[0055] Due to the second chamfer 64 on the projection 36 and the second chamfer 72 of the lower part 12 in the undercut 34, the cover 14 is pressed onto the lower part 12 during operation of the centrifuge rotor 10. This relieves the spring 46, which extends its service life, and prevents the cover 14 from wobbling on the lower part 12.

[0056] In the Fig. 3 and 4It can also be seen that the contact point A between the projection 36 and the undercut 34 is located closer to the axis of rotation D with respect to the center point of the bearing 38. As a result, no releasing forces act on the lid 14 when pulled in the release direction L, nor on the closure 32 during operation of the centrifuge rotor 10. Alternatively, it can also be provided that the radial distance of the contact point A from the axis of rotation D is identical to the radial distance of the pivot point of the bearing 38 from the axis of rotation D. In this case, the contact point A lies perpendicularly below the pivot point. With this configuration, the lever arm becomes zero, and no force is generated during centrifugation that would lead to the lever 24 opening. As a result, such a force does not have to be compensated for by the spring 46 or the centrifugal force during centrifugation. Such a defined contact point A can, for example, be created by a slight rounding (not shown) of the projection 36 in the area of ​​the contact point A.

[0057] Due to the formation of the center of mass M above the bearing 38, the upper end of the lever 24 is pressed radially outward during operation of the centrifuge rotor 10, thereby strengthening the locking between the projection 36 and the undercut 34. Furthermore, this also relieves the load on the spring 46.

[0058] In Fig. 6 It can be seen that the carrying handle 22 is formed around the recesses 44 without an undercut 25. As a result, the levers 24 protrude radially outwards relative to the handle 22 in the locked state (cf. Fig. 1 ). This ensures that the locking mechanism is always properly engaged.

[0059] On the other hand, the inner surface 66 of the lever 24 has the same radius as the bore 20 in the area of ​​the handle 22. This allows for easy actuation of fastening means for connecting the centrifuge rotor 10 to the shaft of a centrifuge motor (not shown). Furthermore, the continuation of the concave shape of the inner surface 66 of the lever 24 and the bore 20 also clearly indicates the properly locked state (see FIG. Fig. 1 ), i.e. the user recognizes an improperly locked state by the fact that the concave shape is not continued, but there is an offset that is very easily perceptible to the user's eye.

[0060] When the lid 14 on the lower part 12 is locked, the sample chamber 26 is completely aerosol-tight by means of the seals 28 and 30, since the closure 32 is located outside the sample chamber 26.

[0061] From the above illustration, it has become clear that the present invention provides a centrifuge rotor 10 in which the closure 32 between the lower part 12 of the centrifuge rotor 10 and the lid 14 has been improved to enable true one-handed operation. In particular, the closure 32 can be closed and released again with just one hand. The closure 32 is structurally simpler and can also be manufactured more cost-effectively. Bezugszeichenliste

[0062] 10First preferred embodiment of the centrifuge rotor according to the invention 12Lower part 14Lid 16Bore holes or compartments for receiving sample vessels 18Hub 20Bore hole in hub 18 22Carrying handle 23Undercut for gripping the carrying handle 22, second undercut 24Operating lever 25Undercut for gripping the operating lever 24 26Sample chamber 28Outer seal between lower part 12 and lid 14 30Inner seal between lower part 12 and lid 14 32Closure between lower part 12 and lid 14 34Undercut in lower part 12, circumferential groove, first undercut 36Protrusions of the operating lever 24 38Bearing axis, screw bolt 38 40Blind hole 42Through hole 44Recess in the lid 14 46 closing spring,Formed spring 48 an injection-molded part of the operating lever 24 50 cavity in operating lever 24 52 through-hole in operating lever 24 54 one end of spring 46 56 recess in operating lever 24 for spring 46 58 other end of spring 46 60 projections 62 first chamfer of projection 36, closing aid 64 second chamfer of projection 36 66, 68 inner surfaces of lever 24 70 first chamfer on lower part 12, closing aid 72 second chamfer on lower part 12 74 projection on lower part 12 D axis of rotation D L release direction M center of gravity SS closing direction,

Claims

1. Centrifuge rotor (10) comprising a lower part (12) and a cover (14), wherein the centrifuge rotor (10) has a rotational axis (D), wherein the cover (14) can be placed onto the lower part (12) along the rotational axis (D) in a closing direction (S) and can be removed along the rotational axis (D) in a detaching direction (L), wherein, when the cover (14) is closed, there is a closure (32) between the lower part (12) and the cover (14), wherein at least one of the elements out of the lower part (12) and the cover (14) comprises at least one first undercut (34), in which, when the cover (14) is closed, at least one projection (36) engages, which is arranged on the other of the elements out of the cover (14) and the lower part (12), wherein the projection (36) is arranged on a lever (24) having a fulcrum (38), characterised in that the cover (14) comprises a circular cut-out (20) for fastening the centrifuge rotor (10) in a centrifuge, wherein the lever (24) has a concave shaping (66) which continues the circular cut-out (20) and points towards the rotational axis (D), wherein the lever (24) is arranged such that, when the cover (14) is closed, the concave shaping (66) does not project inwards into the circular cut-out (20).

2. Centrifuge rotor (10) according to claim 1, characterised in that the first undercut (34) is configured to extend perpendicularly to the rotational axis (D), and / or in that the first undercut (34) is configured to extend all the way around the rotational axis (D).

3. Centrifuge rotor (10) according to any of claims 1 or 2, characterised in that a closing aid is arranged which is preferably configured as a chamfer (62, 70) or rounded portion, by means of which the projection (36) is brought into engagement with the first undercut (34) when the cover (14) is placed onto the lower part (12), wherein it is preferably provided that the projection (36) has a chamfer (62) or rounded portion that points towards the lower part (12) and / or a chamfer (70) or rounded portion that points towards the cover (14) is arranged in front of the first undercut (34) relative to the closing direction (S).

4. Centrifuge rotor (10) according to claim 3, characterised in that the chamfer (62, 70) has an angle in the range of from 20° to 80°, preferably 45° to 75°, in particular 60°, relative to the rotational axis (D).

5. Centrifuge rotor (10) according to any of the preceding claims, characterised in that the projection (36) has a chamfer (64) or rounded portion that points towards the cover (14) and / or the first undercut (34) has a chamfer (72) or rounded portion that points towards the lower part (12).

6. Centrifuge rotor (10) according to any of the preceding claims, characterised in that two opposing projections (36) are formed in relation to the rotational axis (D).

7. Centrifuge rotor (10) according to any of the preceding claims, characterised in that the projection (36) has preloading that points towards the first undercut (34), which preloading is preferably provided by a spring, in particular by a shaped spring (46).

8. Centrifuge rotor (10) according to any of the preceding claims, characterised in that the fulcrum (38) is preferably arranged on the cover (14).

9. Centrifuge rotor (10) according to claim 8, characterised in that the centre of gravity (M) of the lever (24) is situated above the fulcrum (38) in relation to the closing direction (S).

10. Centrifuge rotor (10) according to claim 8 or 9, characterised in that the lever (24) comprises two lever parts (48).

11. Centrifuge rotor (10) according to any of claims 8 to 10, characterised in that, when the cover (14) is closed, the projection (36) has at least one contact point (A) with the first undercut (34), of which the radial spacing from the rotational axis (D) corresponds at most to the radial spacing of the fulcrum (38) from the rotational axis (D), wherein the radial spacing of the contact point (A) from the rotational axis (D) is preferably identical to the radial spacing of the fulcrum (38) from the rotational axis (D).

12. Centrifuge rotor (10) according to any of claims 8 to 11 in conjunction with claim 7, characterised in that at least one side (54) of the spring (46) is anchored inside the lever (24).

13. Centrifuge rotor (10) according to any of claims 8 to 12, characterised in that the fulcrum comprises a bearing shaft (38), which is mounted in a blind hole (40) on one side, wherein there are two levers (24) and the corresponding blind holes (40) are arranged rotationally symmetrically relative to the rotational axis (D).

14. Centrifuge rotor (10) according to any of the preceding claims, characterised in that the cover (14) comprises a second undercut (23) as a grip for carrying the centrifuge rotor, wherein the second undercut (23) preferably projects relative to the cover (14).

15. Centrifuge rotor (10) according to any of the preceding claims, characterised in that there is a preferably aerosol-tight seal (30) between the cover (14) and the lower part (12) after the first undercut (34) in relation to the closing direction (S), such that the closure (32) is arranged outside the sample space (26) formed between the cover (14) and the lower part (12) in relation to the seal (30).