阅读说明：本技术 固定角度转子 (Fixed angle rotor ) 是由 S·库纳特 于 2019-08-16 设计创作，主要内容包括：本发明公开了一种用于离心机的固定角度转子(10),其转子本体(12)的下侧(32)上设置有加固肋状物(36,38),在操作期间甚至在高速时,转子本体(12)的旋转能量相当低,由此显著地提高了安全性而不需要在装配了该固定角度转子的离心机中的增强防护的器皿。同时,驱动固定角度转子(10)所需的驱动功率保持为很低。此外,固定角度转子(10)能够被成本有效地制造,因为无需附加部件；相反,也可以在制造转子本体(12)期间制造加固肋状物(36,38)。最后,还可以使用非常薄的转子壳(38),其改进了对样品的温度控制,因为固定角度转子(10)具有非常好的结构稳定性,特别是在主负载方向中。(A fixed angle rotor (10) for a centrifuge is disclosed, which rotor body (12) is provided on its underside (32) with stiffening ribs (36, 38), the rotational energy of the rotor body (12) being considerably low during operation even at high speeds, whereby safety is significantly improved without the need for a protective-enhanced vessel in a centrifuge equipped with the fixed angle rotor. At the same time, the drive power required to drive the fixed angle rotor (10) is kept low. Furthermore, the fixed angle rotor (10) can be manufactured cost-effectively, since no additional components are required; conversely, the stiffening ribs (36, 38) may also be manufactured during the manufacture of the rotor body (12). Finally, it is also possible to use a very thin rotor shell (38), which improves the temperature control of the sample, since the fixed angle rotor (10) has very good structural stability, especially in the main load direction.)

1. Fixed angle rotor (10; 100) for a centrifuge (200), in particular a laboratory centrifuge, the fixed angle rotor (10; 100) having a rotor body (12; 102), the rotor body (12; 102) having a hub (18; 108) and a rotor axis (R; R '), wherein the hub (18; 108) is arranged around the rotor axis (R; R '), wherein in the rotor body (12; 102) at least two holders (22; 104) for a sample to be centrifuged are arranged around the rotor axis (R; R '), wherein the rotor body (12; 102) has an upper side (20; 120) and an oppositely arranged lower side (32; 106), wherein the holders (22; 104) have an opening on the upper side (20; 120) for introducing the sample, characterized in that the rotor body (12; 102) has on its lower side (36; 106) at least two stiffening ribs (36; 36) 38; 114).

2. The fixed angle rotor (10; 100) as claimed in claim 1, characterized in that at least one of the at least one reinforcing rib (36; 114) runs in a radial manner with respect to the rotor axis (R; R '), preferably in the direction of the holder (22; 104), and in particular in the direction of the centre axis (Z; Z') of the holder (22; 104).

3. Fixed angle rotor (10; 100) according to claim 1 or 2, characterized in that at least one of the at least one reinforcing rib (36; 114) extends between a holder (22; 104) and the hub (18; 108), preferably being connected with the holder (22; 104) and the hub (18; 108).

4. Fixed angle rotor (10; 100) according to one of claims 1 to 3, characterized in that at least one of the at least one reinforcing rib (38) runs tangentially with respect to the rotor axis (R; R ') and at a distance from the rotor axis (R; R').

5. Fixed angle rotor (10; 100) according to one of claims 1 to 4, characterized in that at least one of the at least one reinforcing rib (38) extends between two holders (22; 104), preferably is connected with both holders (22; 104), and in particular extends in the direction of the respective centre axis (Z; Z') of the respective holder (22; 104).

6. The fixed angle rotor (10; 100) of one of the preceding claims, characterized in that the fixed angle rotor (10; 100) has a rotationally symmetrical rotor shell (28; 112) around the holder (22; 104).

7. The fixed angle rotor (10; 100) of claim 6, characterized in that the retainer (22; 104) opens into the rotor housing (28; 112) at least in a region.

8. The fixed angle rotor (10; 100) of one of the preceding claims, characterized in that the rotor body (12; 102) has at its underside (32; 106) at least one cavity (42, 44; 122) extending in an axial manner with respect to the rotor axis (R; R') in addition to the at least one reinforcing rib (36, 38; 114) for material reduction.

9. The fixed angle rotor (10; 100) of claim 8, characterized in that the cavity (42, 44; 122) is arranged between the holders (22; 120), preferably a) between the rotor casing (28), the walls (29) of two adjacent holders (22) and the tangentially extending reinforcing rib (38), and/or b) between the tangentially extending reinforcing rib (38), two adjacent radially extending reinforcing ribs (36) and the hub (18), and/or c) between the rotor casing (112), the walls (124) of two adjacent holders (104), two adjacent radially extending reinforcing ribs (114) and the hub (108).

10. Fixed angle rotor (10; 100) according to claim 8 or 9, characterized in that the cavity (42, 44; 122) extends, preferably does not penetrate, at least in a region up to the rotor housing (28; 12) and/or to the hub (18; 108) and/or to a holder (22; 104) and/or to a cover surface (40; 118) of the upper side (20; 120) of the rotor body bounding the rotor chamber (16; 116).

11. The fixed angle rotor (10; 100) of one of the preceding claims, characterized in that the thickness of the rotor shell (28; 112) and/or the thickness of the reinforcing ribs (36, 38; 114) and/or the thickness of the retainers (22; 104) and/or the thickness of the rotor body (12; 102) on the upper side (20; 120) of the rotor body (12; 102) is at least in regions smaller than 1cm, preferably smaller than 5mm, in particular smaller than 3 mm.

12. The fixed angle rotor (10; 100) according to one of the preceding claims, characterized in that in the wall of the rotor housing (28; 112), in the walls (29; 124) of at least two of the holders (22; 104), on at least one of the reinforcing ribs (36, 38; 114) and/or on the cavity (42, 44; 122) according to claim 8, there is a gradual change (54; 132) in material thickness relative to the rotor body (12; 102), at least in a region which is arranged, preferably in an axial manner, with respect to the rotational axis (R; R'), wherein the gradual change (54; 132) is in particular stepped.

13. The fixed angle rotor (10; 100) of claim 12, characterized in that the gradual change (54; 132) has a step width and/or a step height in the range of 0.5mm to 8mm, preferably in the range of 1mm to 6mm, in particular in the range of 2mm to 5 mm.

14. The fixed angle rotor (10; 100) of one of the preceding claims, characterized in that the underside (32; 106) of the rotor body (12; 102) has a covering (58; 136), the covering (58; 136) covering the reinforcing rib (36, 38; 114) and/or the cavity (42, 44; 122).

15. The fixed angle rotor (10; 100) according to one of the preceding claims, characterized in that the holder (42, 44; 122) is configured to be closed except for an opening for inserting a sample to be centrifuged.

Technical Field

The present invention relates to a fixed angle rotor according to the preamble of claim 1.

Background

Centrifugal rotors are used in centrifuges, particularly laboratory centrifuges, to separate components of a sample centrifuged therein using mass inertia. For this reason, increasingly higher rotational speeds are used to achieve high separation rates. The laboratory centrifuge is a centrifuge with a centrifuge rotor which preferably runs at least at 3,000 revolutions per minute, preferably at least at 10,000 revolutions per minute, in particular at least at 15,000 revolutions per minute, and is usually placed on a table. In order to be able to place them on the table, they have in particular a form factor of less than 1m × 1m × 1 m; therefore, their installation space is limited. Preferably, the depth of the device is limited to a maximum of 70 cm. However, laboratory centrifuges formed as vertical centrifuges (that is to say that they range in height from 1m to 1.5m, so that they can be placed on the floor of a room) are also known.

Such centrifuges are used in the medical, pharmaceutical, biological and chemical fields.

The samples to be centrifuged are stored in sample containers and these are rotated by means of a centrifuge rotor. The centrifugal rotor is usually set in rotation by means of a vertical drive shaft, which is driven by an electric motor. The coupling between the centrifugal rotor and the drive rod is normally effected by the hub of the centrifugal rotor.

There are different centrifugal rotors whose use depends on the application. The sample container may contain the sample directly, or a single sample capsule containing the sample may be inserted into the sample container so that a large number of samples may be centrifuged simultaneously in one sample container. In general, fixed angle rotors, swing-out rotors and other forms of centrifugal rotors are known, wherein the invention is based on fixed angle rotors in which holders for samples in the rotor body are arranged at a fixed angle relative to the rotor axis, which is usually inclined. For more accuracy, the inclination extends from the opening of the holder to the outside. Such a fixed-angle rotor is known, for example, from DE 3806284C 1.

The problem is that the higher speeds required require even higher motor powers due to the dead weight of the fixed angle rotor, wherein for safety reasons high strength materials such as steel, titanium and aluminium have to be used.

Although the use of fiber composite materials is known from DE 10233536 a1, for example, the weight that can be reduced thereby is so small that the weight of the rotor is still so great that it is not possible to increase the rotational speed significantly.

To solve this problem, it is proposed in DE 102011107667 a1 to manufacture the rotor body from porous metal and to provide external reinforcement. Although this leads to a further reduction of the mass of the rotor and thus to a higher rotational speed at the same motor power, the reinforcement increases the mass on the outer radius of the centrifuge rotor and thus increases the kinetic energy, resulting in a high collision energy in the event of a collision, which may be a safety hazard and should be compensated for by the addition of collision protection of the centrifuge vessel surrounding the centrifuge.

Disclosure of Invention

It is therefore an object of the present invention to provide a fixed angle rotor, avoiding these disadvantages. Preferably, its rotational energy should be as low as possible, thereby increasing safety, and the driving power required for driving the centrifugal rotor should be kept as low as possible. In particular, the fixed angle rotor should be able to withstand extreme loads over a long period of time and should be manufactured at low cost.

This object is achieved with a fixed angle rotor according to the invention in claim 1. Advantageous additional forms are described in the dependent claims and in the subsequent description and drawings.

The applicant has realized that this object can be achieved in a surprisingly simple manner if at least one reinforcing rib is arranged on the underside of the rotor body, since this ensures that the structure of the rotor body is stable even at high speeds if the rotor body itself has less material.

Within the framework of the invention, a "reinforcing rib" is a physical rib or bar that serves to increase the structural stability of the rotor body. The ribs or bars have at least one long side and one narrow side, and their long sides extend continuously between two areas of the rotor body. They may also extend on the additional side between the long side and the rotor body, but this is not necessary as they may also be formed hollow.

The fixed angle rotor for centrifuges, in particular laboratory centrifuges, according to the invention has a rotor body with a hub and a rotor axis, wherein the hub is arranged around the rotor axis, wherein in the rotor body at least two holders for a sample to be centrifuged are arranged around the rotor axis, wherein the rotor body has an upper side and an oppositely arranged lower side, wherein the holders have an opening on the upper side for introducing the sample, characterized in that the rotor body has at least one reinforcing rib on its lower side.

In an advantageous additional form, provision is made for at least one of the at least one reinforcing ribs to run in a radial manner with respect to the rotor axis, advantageously in the direction of the holder, and in particular in the direction of the central axis of the holder. This makes centrifugal forces particularly well supported. In this context, the "central axis" is the virtual center line along which the sample to be centrifuged is inserted.

In an advantageous additional form, provision is made for at least one of the at least one reinforcing ribs to extend between a holder and the hub, advantageously in connection with the holder and the hub. In this case, the centrifugal rotor has a particular structural stability with respect to centrifugal forces, in particular if the rotor body material is more in the region of the holder with respect to the circumference of the rotor body than in the region next to it.

In an advantageous additional form, provision is made for at least one of the at least one reinforcing ribs to run tangentially with respect to the axis of rotation and at a distance from the axis of rotation. This enables the forces to be supported particularly well during acceleration and deceleration.

In an advantageous additional form, provision is made for at least one of the at least one reinforcing ribs to extend between the two holders, advantageously to be connected to the two holders, and particularly advantageously to extend in the direction of the respective central axis of the respective holder. In this case, the centrifugal rotor has a particular structural stability with respect to the forces applied during acceleration and deceleration, in particular if the rotor body material is more in the region of the circumference of the holder with respect to the rotor body than in the regions beside it.

In an advantageous additional form, it is provided that the fixed-angle rotor has a rotationally symmetrical rotor shell around the holder. This means that the centrifugal rotor is aerodynamically surrounded and provides little flow resistance to the surrounding fluid.

In an advantageous additional form, provision is made for the holder to open into the rotor casing at least in regions. In this case, the rotor body is very stable in terms of structure even if there is little material surrounding the holder.

In an advantageous additional form, provision is made for the rotor body to have, on its underside, in addition to the at least one reinforcing rib, at least one cavity which extends in an axial manner relative to the axis of rotation in order to reduce material. As a result, the fixed-angle rotor has a smaller mass and therefore a sufficiently high structural stability, so that less drive power is required. Furthermore, the kinetic energy stored in the fixed angle rotor is lower during the operation process. The cavity is preferably arranged between the holders, in particular a) between the rotor shell, the walls of two adjacent holders and the tangentially extending reinforcing rib, or b) between the tangentially extending rib, the two adjacent radially extending reinforcing ribs and the hub, or c) between the rotor shell, the walls of two adjacent holders, the two adjacent radially extending reinforcing ribs and the hub.

In an advantageous additional form, provision is made for the cavity to extend at least in the region up to the rotor shell and/or to the hub and/or to the holder and/or to the covering surface of the upper side of the rotor body bounding the rotor chamber, in particular without penetrating these elements.

In an advantageous additional form, provision is made for the thickness of the rotor shell and/or the thickness of the reinforcing ribs and/or the thickness of the wall of the holder and/or the thickness of the rotor body on its upper side to be less than 1cm, preferably less than 5mm, in particular less than 3mm, preferably 1.5mm, at least in regions. As a result, the fixed-angle rotor is still particularly stable in terms of construction, but has a low mass.

In an advantageous additional form, provision is made for there to be a gradual change in the material thickness relative to the rotor body, at least in regions, in the wall of the rotor housing, in the walls of the at least two holders, on the at least one reinforcing rib and/or on the cavity; this is preferably arranged in an axial manner with respect to the rotor axis, wherein the progression is in particular stepped. Such a gradual change is in particular provided at least in the region inclined with respect to the rotor axis. This results in a particularly stable stiffening of the rotor body, so that even the highest loads can be tolerated.

In an advantageous additional form, provision is made for the gradual change to have a step width and/or a step height in the range from 0.5mm to 8mm, preferably in the range from 1mm to 6mm, in particular in the range from 2mm to 5 mm. The smaller such step size, the lighter the fixed angle rotor, but the less the reinforcing effect. The smaller such step size, the more effort is expended in manufacturing. Conversely, the larger the step size, the greater the weight of the fixed angle rotor. For the specified range, there is a sufficient weight reduction and a sufficiently high stability, but the effort for production is low.

In an advantageous additional form, provision is made for the underside of the rotor body to have a covering which covers the reinforcing ribs and/or cavities, whereby, in aerodynamic terms, the fixed-angle rotor is very suitably formed in spite of the reinforcing ribs and/or cavities. This avoids wind noise and significantly reduces wind resistance, which reduces power consumption. Furthermore, a closed fixed angle rotor is created by the cover, which promotes tactile feel and cleanability. The cover is preferably clamped and/or screwed onto the rotor body.

In an advantageous additional form, provision is made for the holder to be configured so as to be closed except for the opening for inserting the sample to be centrifuged. As a result, the fixed angle rotor has good cleanability and stability.

Drawings

The features and additional advantages of the invention will be elucidated on the basis of a preferred exemplary embodiment and the accompanying drawings. The following are therefore purely schematic representations:

figure 1 is a perspective view from above of a fixed angle rotor according to a first preferred embodiment of the present invention,

figure 2 is a perspective view from below of the fixed angle rotor according to figure 1 according to the invention,

figure 3 is a plan view from below of the fixed angle rotor according to figure 1 according to the invention,

figure 4 a cross-sectional view of the fixed angle rotor according to figure 1 according to the present invention,

figure 5 is a perspective view from above of a fixed angle rotor according to a second preferred embodiment of the present invention,

figure 6 is a perspective view from below of the fixed angle rotor according to figure 5 according to the invention,

figure 7 plan view from below of the fixed angle rotor according to figure 5 according to the invention,

FIG. 8 is a cross-sectional view of a fixed angle rotor according to FIG. 5, according to the present invention, an

FIG. 9 is a perspective view of a centrifuge equipped with a fixed angle rotor according to the present invention.

Detailed Description

Fig. 1 to 4 show a fixed angle rotor 10 according to a first preferred design of the present invention.

It can be seen that the fixed angle rotor 10 has a rotor body 12 and a cover 14, the cover 14 surrounding a rotor chamber 16 between the rotor body 12 and the cover 14. The rotor body 12 has a hub 18, the hub 18 extending along a rotor axis R and serving to couple with a drive rod of a centrifugal motor of a laboratory centrifuge in the usual way and therefore need not be shown in more detail.

In the rotor body 12, a holder 22 is arranged on its upper side 20, into which a sample container containing a sample to be centrifuged can be inserted and centrifuged in the usual manner, wherein the sample container corresponds to the rotor chamber 16. A seal 23 is provided between the rotor body 12 and the cover 14, and damping is generated between the cover 14 and the rotor body 12 by the cover 14, which prevents possible rattling. If the seal 23 is suitably formed, the rotor chamber 16 can also be sealed in an aerosol-tight manner against the surrounding area 24 of the fixed angle rotor 10.

With respect to the outer circumference 26 of the rotor body 12, the rotor body 12 is limited by a rotor shell 28, which rotor shell 28 is formed rotationally symmetrically and thus aerodynamically around the centrifuge rotor, by which the fixed angle rotor 10 in a laboratory centrifuge offers little flow resistance to the surrounding fluid.

It can also be seen that the wall 29 of the holder 22 merges into the rotor 28 at least in the region — thus, the rotor housing 28 directly forms the wall 29 in the region 30, with the rotor housing 28 merging tangentially with the holder. The wall 29 of the holder 22 is configured to be closed except for the opening for inserting the sample to be centrifuged.

Further, the rotor body 12 has a number of reinforcing ribs 36, 38 on its lower side 32, the reinforcing ribs 36, 38 extending between the hub 18 and the lower edge 34 of the rotor shell 28. Thus, the reinforcing ribs 36 of the first type extend in a radial manner with respect to the rotor axis R between the retainer 22 and the hub 18. Reinforcing ribs 36 connect the hub 18 and the retainer 22 and extend in the direction of the central axis Z of the retainer 22. The second type of reinforcing rib 38 extends tangentially with respect to the rotor axis R, i.e. at a distance from the rotor axis R, between adjacent holders 22, wherein the second type of reinforcing rib 38 connects each of the two holders 22 and extends in the direction of the respective center axis Z of the respective holder 22. Both reinforcing ribs 36 and 38 extend from the lower side 32 of the rotor body 12 to a cover surface 40 of the upper side 20 of the rotor body 12, the rotor body 12 bounding the rotor chamber 16.

In addition, the rotor body 12 has a plurality of cavities 42, 44 on its lower side 32 to reduce material. The cavities 42 of the first type are arranged between the rotor shell 28, the walls 29 of two adjacent holders 22 and the reinforcing ribs 38 of the second type. The second type of cavity 44 is arranged between the second type of reinforcing rib 38, two adjacent reinforcing ribs 36 of the first type and the hub 18. Each of the two types of cavities extends from the lower side 32 of the rotor body 12 to a cover surface 40 of the upper side 20 of the rotor body 12, the rotor body 12 bounding the rotor chamber 16.

The thickness of the walls is formed such that they correspond to about 1.7mm for the rotor shell 28, about 6mm for the first type of reinforcing ribs 36 and about 5mm for the second type of reinforcing ribs 38. The thickness of the wall of the mantle surface 40 in the region of the cavities 42, 44 amounts to less than 5mm, preferably 1.5 mm.

By incorporating the cavities 42, 44 to reduce the material of the reinforcing ribs 36, 38 and the rotor shell 28, the fixed angle rotor 10 has a very low mass, but is particularly stable in terms of construction so that less drive power is required. Furthermore, the kinetic energy stored in the fixed angle rotor 10 during operation is relatively low.

This high structural stability is further enhanced by the fact that: the inner wall 46 of the rotor housing 28, the transitions 48, 50 between the wall 29 of the holder 22 and the wall 29 of the holder 22, and also the reinforcing ribs 36, 38 and also the cavities 42, 44 are provided with tapers 54, the tapers 54 being arranged in an axial manner with respect to the axis of rotation R. Therefore, the gradation 54 is formed in a stepwise shape in which each of the step width and the step height corresponds to 5 mm. On the other hand, the underside 56 of the holder 22 is not provided with such a gradual change 54. This tapering 54 results in a particularly stable stiffening of the rotor body 12, so that it can withstand the highest loads despite the weight saving. The gradation 54 may also be formed continuously rather than stepwise (discontinuous).

Furthermore, the fixed angle rotor 10 has a lower shroud 58, the lower shroud 58 being fixed to the underside 32 of the rotor body 12 by means of a coupling 60 of the hub 18 and being laterally supported by a projection 62 of the rotor housing 28 (this shroud 58 is not shown in fig. 2 and 3 for better understanding). Given such a covering 58, the fixed angle rotor 10 is provided with reinforcing ribs 36, 38, and the cavities 42, 44 are very suitably formed aerodynamically and have a significantly lower overall weight compared to earlier fixed angle rotors.

Fig. 5 to 8 show a second preferred design of the fixed angle rotor 100 according to the invention. There is similarity to the fixed angle rotor 10 of the first preferred design, so only the differences will be explained below.

It can be seen that for this fixed angle rotor 100, the rotor body 102 is not just six but ten smaller holders 104 for the sample.

Furthermore, the rotor body 102 has on its lower side 106 a number of reinforcing ribs 114, the lower side 106 extending between the hub 108 and the lower edge 110 of the rotor housing 112, wherein, however, only one type of reinforcing ribs 114 extends between the holder 104 and the central hub 108 in a radial manner with respect to the axis of rotation R' and extends in an axial manner from the lower side 106 to a cover surface 118 of an upper side 120 of the rotating body 102 bounding the rotor chamber 116. The reinforcing ribs 114 also extend between the hub 108 and the retainer 104, wherein each of the reinforcing ribs 114 connects the hub 108 and the retainer 104 and extends in the direction of the central axis Z of the respective retainer 104.

Accordingly, there is only one type of cavity 122 for reducing material in the rotor body 102. Such a cavity 122 is arranged between the rotor housing 112, two adjacent walls 124 of the holder 104, adjacent reinforcing ribs 114 and the hub 108, extending from the lower side 106 of the rotor body 102 to the cover surface 118 of the upper side 120 of the rotor body 102 bounding the rotor chamber 116.

The thickness of the walls is formed such that they correspond to about 1.7mm for the rotor shell 112, 7mm for the reinforcing ribs 114, and less than 5mm, preferably 1.5mm, for the covering surface 118 in the region of the cavity 122.

The fixed angle rotor 100 also has a very low mass due to the combination of the cavities 122 for reducing material with the reinforcing ribs 114 and the rotor shell 112, but is nevertheless particularly stable in terms of construction, so that less driving power is required. Furthermore, the kinetic energy stored in the fixed angle rotor 100 during operation is relatively low.

This high structural stability is further enhanced by the fact that: the wall 126 of the rotor housing 112, the wall 124 of the holder 104 and the rotor housing 112 as well as the transition 130 between the reinforcing ribs 114 and the hub 108 and also the cavity 122 are provided with tapers 132, the tapers 132 being arranged in an axial manner with respect to the rotor axis R'. Therefore, the gradation 132 is also formed in a stepwise shape in which each of the step width and the step height is equivalent to 2 mm. The underside 134 of the holder 102 is thus not provided with such a gradual transition 132. This tapering 132 results in a particularly stable stiffening of the rotor body 102, so that it can withstand the highest loads despite the weight saving.

Furthermore, the fixed angle rotor 100 has a lower cover 136, which lower cover 136 is fixed to the underside 106 of the rotor body 102 by a screw connection (not shown) and is laterally supported on a projection 138 of the rotor housing 112 (for better understanding, this cover is not shown in fig. 6 and 7). Given such a covering 136, the fixed angle rotor 100 is provided with reinforcing ribs 114, and the cavities 122 are very suitably formed aerodynamically and have a significantly lower overall weight than earlier fixed angle rotors.

For two fixed angle rotors 10, 100, the rotor body 12, 102 may be manufactured in one piece, for example, by milling and CNC machining the rotor body 12, 102 out of a blank (e.g., out of a round material or drop forged piece made of aluminum or steel). Alternatively, there may be a multi-piece manufacturing approach where the hubs 18, 108 are manufactured separately and inserted (e.g., screwed) into the rotor bodies 12, 102.

It can be seen that each of the reinforcing ribs 36, 38, 114 has a long side 62, 140 and a narrow side 64, 142. They also have additional sides 66, 144, the additional sides 66, 144 extending continuously between the long sides 62, 140 and the rotor body 12, 102. Alternatively, it may be provided that the additional sides 66, 144 are not formed continuously between the long sides 62, 140, whereby the reinforcing ribs 36, 38, 114 will be hollow and the adjacent cavities will communicate with each other, but this will also result in an improved structural stability, while the mass is significantly reduced.

Fig. 9 shows a laboratory centrifuge 200 equipped with a fixed angle rotor 10 according to the invention.

It can be seen that such a laboratory centrifuge 200 is formed in a general manner, comprising a housing 202 and a cover 208, the housing 202 having a control panel 206 arranged at its front side 204, the cover 208 being provided close to a centrifuge container 210. A fixed angle rotor 10, which may be driven by a rod of a centrifugal motor (neither shown), is arranged in the centrifuge vessel 210.

As is apparent from the foregoing description, the present invention provides a fixed angle rotor 10, 100 for a centrifuge 200, the rotational energy of the centrifuge 200 during operation even at high speeds being relatively low, thereby significantly improving safety without requiring an enhanced shielded vessel in a centrifuge equipped with the fixed angle rotor 10, 100. At the same time, the drive power required for driving the fixed angle rotors 10, 100 is kept low. The fixed angle rotors 10, 100 are also subjected to extreme loads for extended periods of time. Furthermore, the fixed angle rotor 10, 100 can be manufactured cost-effectively, since no additional components are required; conversely, the stiffening ribs 36, 38, 114 may also be fabricated during the fabrication of the rotor body 12, 102. Finally, very thin rotor shells 28, 112 can also be used, which improves the temperature control of the sample, since the fixed angle rotor has very good structural stability, especially in the main load direction.

All features of the invention may be freely combined, unless otherwise specified. Furthermore, the features described in the drawings of the specification may be freely combined with other features as well as the features of the invention, unless otherwise specified. No limitation of individual features of the exemplary embodiments to combinations of other features of the exemplary embodiments is specifically provided. In addition, the rewritten avatar characteristics can also be used for process characteristics, and the rewritten process characteristics can be used for avatar characteristics. Thus, such recombination is also automatically disclosed.

List of reference numerals

10 fixed-angle rotor in accordance with a first preferred design of the present invention

12 rotor body

14 cover

16 rotor chamber

18 hub

20 upper side of the rotor body

22 holder

23 seal between the cover 14 and the rotor body 12

24 peripheral region of fixed angle rotor 10

26 outer circumference of rotor body 12

28 rotor case

29 wall of the holder 22

30 of the rotor housing 28, wherein the rotor housing 28 merges tangentially with the holder 22

32 lower side of the rotor body 12

34 lower edge of the rotor shell 28

36 first type of reinforcing ribs

38 second type of reinforcing ribs

40 limit the cover surface of the upper side 20 of the rotor chamber 16

42 cavities of a first type in the rotor body 12

44 cavities of a second type in the rotor body 12

46 wall of rotor housing 28

48 transition between wall 29 of holder 22 and reinforcing rib 36

50 transition between wall 29 of retainer 22 and reinforcing rib 38

54 gradual change

56 underside of retainer 22

Cover under 58

60 coupling

61 rotating the projection of the shell 28

62 reinforcing the long sides of the ribs 36, 38

64 reinforcing the narrow sides of the ribs 36, 38

66 reinforcing additional sides of the ribs 36, 38

100 fixed angle rotor 100 according to a second preferred design of the present invention

102 rotor body

104 holder

106 lower side of the rotor body

108 hub

110 lower edge of rotor shell 112

112 rotor case

114 reinforcing ribs

116 rotor chamber

118 upper side 120 cover surface

120 upper side

122 rotor body 102 cavity

124 rotor housing 112 wall

128 transition between the wall 124 of the retainer 104 and the reinforcing rib 114

130 reinforce the transition between the rib 114 and the hub 108

132 gradient

134 the underside of the retainer 102

136 lower covering

138 projections of the rotor housing 112

140 reinforce the long sides of the ribs 114

142 reinforcing the narrow sides of the ribs 114

144 reinforcing the additional side of the rib 114

200 laboratory centrifuge

202 casing

204 front side of the housing 202

206 control panel

208 cover

210 centrifugal container

R axis of rotation

R' axis of rotation

Center axis of Z holder 22

Center axis of Z' holder 104