Centrifuge with rotor chamber

Abstract

A centrifuge (1) having a rotor chamber (2) comprising a rotor (3) driven by a shaft (4) defining a rotation axis (R), wherein the centrifuge (1) includes an air inlet (21) and an air outlet (22), wherein the rotor (3) is axially arranged between the air inlet (21) and the air outlet (22), wherein a rotatably fixed gas cutting disc (10) is arranged in the rotor chamber (2) between the air outlet (22) and the rotor (3), and the gas cutting disc (10) defines an airflow passage (13) extending radially inward from the radially outer periphery (12) of the gas cutting disc (10) toward the central portion (15) of the gas cutting disc (10).

Description

Technical Field

[0001] This invention belongs to the technical field of laboratory centrifuges, specifically to the field of cooling arrangements and air guides for ventilated centrifuges. Background Technology

[0002] Laboratory centrifuges are used to separate substances of higher and lower density based on the principle of sedimentation. Therefore, a laboratory centrifuge consists of a rotor with a receiver for a sample container. In most cases, the sample container is arranged relative to the circumference of the rotor. The centrifuge rotor is driven to rotate about a central axis, thus applying centrifugal acceleration to the sample container and the sample within it. This allows forces several orders of magnitude higher to be applied to the sample than those achievable under gravitational acceleration. The radial acceleration during centrifugation causes denser particles to settle radially outwards, while lower-density substances are forced inwards. The rotor rotates at high speeds, typically exceeding 10,000 rpm. A cylindrical rotor with a diameter of 0.2 m has a circumferential speed of approximately 180 m / s at a rotational speed of 17,000 rpm.

[0003] Vented centrifuges have an air-filled chamber in which a rotor rotates. The chamber is typically covered on top. The air contained within the chamber is accelerated by the rotation of the rotor, and the friction between the rotor and the contained air causes heating of the rotor, the air, and the sample carried by the rotor.

[0004] This elevated temperature may cause side reactions in the sample, which could negatively impact further diagnostic testing. It is generally desirable to heat the sample to within 15 K above ambient temperature, ensuring that the sample temperature does not exceed 37 °C at a room temperature of 22 °C.

[0005] To avoid this heating, ventilated centrifuges use ambient air to cool the rotor. The air is entrained by the rotor's rotational motion and accelerated radially outwards towards the generally vertical walls of the rotor chamber. This creates a pressure gradient along the radial direction, i.e., high pressure at the rotor's axis of rotation towards lower and higher pressures around the rotor's circumference. Air is drawn in from the outside through air ducts around the center of rotation and exits the unit at a more distant point through air outlets. This flowing air is a source of noise interference that needs to be reduced. The radially oriented build volume of the centrifuge is largely limited because users preferably require compact instruments; therefore, if the entrained and radially accelerated air exits the rotor chamber through openings in the vertical walls, very limited space is available radially for noise isolation measures.

[0006] WO 2020 212 045A1 illustrates an air inlet at the bottom of the centrifuge chamber and an air outlet at the top. Air is drawn into the chamber via the rotor or via a ventilation system. After being guided from the bottom to the top and through the chamber, the air is subsequently exhausted and / or guided back to the motor in the bottom of the centrifuge. The air is guided via a multi-part air guiding assembly formed of foam material (PP or PU). The air inlet is located near the axis of rotation, and the air is guided by the air guiding assembly in the direction of rotor rotation.

[0007] This arrangement requires a multi-part air guiding assembly with a complex internal ducting structure. The chamber is separated from the shell and requires insulation to prevent the inlet airflow from heating up due to the centrifugal motor. Separation of the air inlet and outlet is necessary. This results in increased space requirements, as the outlet airflow requires a passage between the outer contour of the chamber and the shell.

[0008] US 6,068,586 A relates to a cooling method for a laboratory centrifuge, wherein during operation, the centrifuge is cooled by cooling air drawn in through an air inlet opening on the lower side of the housing and drawn upward into the rotor chamber by the action of a fan generated by the rotation of the rotor. The air is guided out of the rotor chamber through an air outlet in a flow direction tangential to the rotor periphery to ensure low turbulence. Specifically, a slit-shaped air outlet is provided between the housing cover and the top edge of the rotor chamber. Air is introduced through holes in the rotor chamber and discharged through a slit-shaped opening between the lower cover and the top side of the housing. The introduced air is heated by a motor. Therefore, reduced cooling performance is desired. Although turbulence-induced shrouds are foreseeable, an increased noise level is estimated due to the direct coupling of the air outlet to the rotor chamber.

[0009] DE 103 55 179 A1 illustrates an air-cooled centrifuge having an inlet section for supplying air into a centrifuge container, a channel area disposed outside the centrifuge container for discharging air from the centrifuge, and a duct area for discharging air from the centrifuge container, wherein a diffuser is arranged at least upstream of the channel area. DE 103 55 179 A1 specifically shows a diffuser element at the upper edge of the centrifuge container. The diffuser element spans approximately one-quarter of the circumference and directs air to an air outlet in the lower portion of the centrifuge chamber. Air is guided into the centrifuge through an opening in the lower cover and is discharged from the centrifuge through a gap between the top edge of the chamber and the platform of the outer casing. The air guiding device includes a diffuser at the beginning of the air outlet channel. This is an expensive structure and requires radial space due to the additional components and because the outlet airflow requires a channel between the outer contour of the chamber and the outer casing.

[0010] US 5,490,830 A discloses a centrifuge cooled by a fan that draws air through a centrifuge housing having an internal configuration for providing airflow to and around the sealed rotor chamber. The fan draws air into the lower portion of the housing through an inlet, which is separated from the upper portion of the housing by a baffle plate that engages with the walls of the centrifuge housing except for a gap at the front wall. A drive motor is located in the baffle plate, such that cooling air is drawn through the motor and around the motor in both the upper and lower portions of the centrifuge housing. The airflow generated by the fan is directed onto and around the rotor chamber. Air inlets and outlets are arranged in the rear section of the centrifuge. This arrangement is expensive because an additional fan is required to generate the airflow. Furthermore, there is a space requirement because the air needs space to flow around the rotor chamber. Summary of the Invention

[0011] The problem to be solved is to envision a compact, efficient, and quiet air guide arrangement for cooling samples and / or downstream cooling of centrifuge drives within a ventilated centrifuge, while simultaneously reducing noise levels.

[0012] The invention described herein is associated with the definition of an airflow passage in the rotor chamber of a ventilated centrifuge.

[0013] The present invention relates to a centrifuge, preferably to a ventilated centrifuge having a rotor chamber containing a rotor driven by a shaft defining a rotation axis, and wherein the centrifuge includes an air inlet and an air outlet, wherein the rotor is axially arranged between the air inlet and the air outlet, thereby contemplating that a rotary fixed gas cutting disc is arranged in the rotor chamber between the air outlet and the rotor, and the gas cutting disc defines an airflow channel from the radially outer periphery of the gas cutting disc radially inward toward the central portion of the gas cutting disc.

[0014] Air is guided from the air inlet to the air outlet through the rotor chamber via this airflow channel. The airflow channel is the defined path through which the air is guided. The oxy-acetylene cutting disc acts as a separator between the airflow within the airflow channel and the rotating rotor. The rotation of the rotor forces the air to flow radially outward toward the radial wall of the rotor chamber. The oxy-acetylene cutting disc generates flow separation from this radially outward acceleration, primarily caused by the friction between the entrained air and the rotor, thus allowing the air to flow radially inward toward the center of the cutting disc and subsequently toward the centrifuge's air outlet. This increases the airflow rate and thus allows for better cooling performance. Another advantage is that this oxy-acetylene cutting disc reduces the centrifuge's noise emissions.

[0015] According to another aspect of the invention, the gas cutting disc can be arranged concentrically with the axis of rotation. This arrangement contributes to the overall symmetry of the system and has proven beneficial for flow within the air guide channels defined by the air guide disc. By using a concentric arrangement, blockage of the air accelerating radially outward in the rotor chamber is further reduced, which further contributes to the aforementioned benefits of improved cooling performance and reduced noise.

[0016] In another aspect of the invention, it is foreseeable that the oxy-fuel cutting disc may have one or more air deflectors for deflecting air. Air within the rotor chamber is not only picked up by friction at its interface with the rotating rotor of the centrifuge, and thus pushed radially outward, but the air picked up by the rotor will also have a motion component in the direction of rotor rotation. The air deflectors can pick up air with this component and help deflect it radially inward within the airflow channel. Preferably, the oxy-fuel cutting disc may extend radially from the axis of rotation, and the one or more air deflectors may be axial protrusions relative to the axis of rotation, and these air deflectors may protrude from the oxy-fuel cutting disc toward the air outlet. Optionally, the one or more air deflectors may be integrally formed with the oxy-fuel cutting disc.

[0017] According to another aspect of the invention, the one or more air deflectors may have a chamfer or radius between the gas cutting disc and their axial protrusions. Such a radius or chamfer serves as a smooth transition, particularly if the gas cutting disc is a disc that protrudes primarily in the radial direction and the air deflectors protrude substantially perpendicularly in the axial direction. This reduces air turbulence, which helps improve airflow and reduce associated noise.

[0018] In another aspect of the invention, it is anticipated that the one or more air deflectors may extend in an arc shape from the central portion of the cutting disc to the outer periphery of the cutting disc. Preferably, but not exclusively, the arc is specifically implemented to open against the direction of rotor rotation. In another aspect of the invention, it is anticipated that the one or more air deflectors may be concave against the direction of rotor rotation. This advantageously supports the entrainment of air accelerated by the rotor within the airflow channel. According to another aspect of the invention and producing the same benefits, the one or more air deflectors may be arranged in a helical manner. Air entrainment can be further improved by another aspect of the invention, according to which the air deflectors may be tangential to the outer periphery of the cutting disc, and wherein the air deflectors may further arc toward the central portion of the cutting disc, preferably opening against the direction of rotor rotation.

[0019] In another aspect of the invention, it is foreseeable that the gas cutting disc may have a central portion that is offset from the outer portion in an axial direction. This axial offset or bending embodiment of the gas cutting disc can be used to increase the cross-section of the airflow channel defined by the gas cutting disc, and thus facilitates a reduction in air throughput and noise emission, since the rate of air flowing through the airflow channel is reduced relative to the cross-sectional area of ​​the airflow channel.

[0020] According to another aspect of the invention, the one or more air deflectors may have a plurality of engagement features for torque-resistant connection between the cutting disc and the rotor chamber. In this way, the cutting disc remains in a rotationally locked position relative to the rotor, wherein the aforementioned benefits are not diminished by the cutting disc being partially caught in the rotational motion of the centrifuge rotor.

[0021] In another aspect of the invention, it is foreseeable that the gas cutting disc may have a through opening disposed at the central portion of the gas cutting disc, and this through opening may be configured to be passed through by the shaft of the centrifuge. This arrangement significantly improves the construction of the centrifuge with the gas cutting disc, which defines an airflow passage in the rotor chamber. In particular, according to another aspect of the invention, the rotor chamber may open upwards, and the top of the chamber may be covered by a cover, and an air inlet may be disposed within the cover. In particular, it is foreseeable that an air outlet may be disposed in the bottom portion of the chamber. According to another aspect of the invention, the gas cutting disc may be disposed between the bottom portion of the rotor chamber and the rotor, wherein the air inlet may be disposed within the cover of the centrifuge, and the air outlet may be disposed in the bottom portion of the rotor chamber. Essentially, the gas cutting disc may be disposed between the air outlet and the rotor of the centrifuge in such a way that the air outlet is disposed in the bottom of the bowl-shaped rotor chamber, wherein the rotor is driven by a shaft extending through the bottom of the rotor chamber and the gas cutting disc. The bowl-shaped rotor chamber is closed at its upward opening by a cover, wherein the cover has an air inlet. Therefore, the air is accelerated by the rotor toward the radial wall of the rotor chamber and further guided through an airflow channel defined by the gas cutting disc and the bottom of the rotor chamber. Fresh air is forced into the rotor chamber through the air inlet and the pressure difference generated by the radial acceleration of the air entrained within the rotor chamber. The gas cutting disc is used to force the radially outward airflow to separate from the airflow within the airflow channel, which is radially inward toward the air outlet at the bottom of the rotor chamber, by the rotor rotation and friction between the rotor and the air.

[0022] According to another aspect of the invention, the air inlet and / or air outlet may be arranged concentrically with the axis of rotation. This further facilitates efficient air exchange, as the minimum pressure is approximately at the center of rotation, allowing air to be effectively drawn in through the air inlet, and the rotating, agitated air is also effectively guided radially inward to its center of rotation without any significant loss of airflow or the generation of unwanted turbulence.

[0023] Therefore, while maintaining the aforementioned advantages, it is foreseeable that, in another aspect of the invention, the air inlet, air outlet, rotor, rotor chamber, and cutting disc can form an airflow path from the air inlet through the gap between the outer periphery of the rotor and the axial wall of the rotor chamber, across the airflow channel defined by the cutting disc, to the air outlet. According to another aspect of the invention, the cutting disc can separate radially inwardly guided air between the cutting disc and the bottom portion of the chamber from the rotor, and specifically from the rotor's surface facing the bottom portion of the chamber. Thus, the cutting disc serves as a separator between the airflow within the airflow channel and the rotating rotor, and separates the radially inwardly flowing airflow in the airflow channel towards the air outlet from any radially outwardly flowing airflow caused by the air picked up by the rotating rotor during centrifuge operation.

[0024] In another aspect of the invention, it is foreseeable that the outer periphery of the gas cutting disc may correspond to the lower outer rotating periphery of the rotor, which improves the intake of air into the airflow channel defined by the gas cutting disc.

[0025] According to another aspect of the invention, the gas cutting disc can guide airflow axially downward toward the air outlet, and in another aspect of the invention, it is foreseeable that the one or more air deflectors can extend radially outward beyond the radial outer periphery of the air outlet, and / or the one or more air deflectors can extend radially inward beyond the radial outer periphery of the air outlet. In this way, air guidance toward the air outlet is further improved.

[0026] In another aspect of the invention, it is foreseeable that the air inlet can have a smaller diameter than the air outlet. Such a size further improves the efficiency of air exchange because it prevents the air outlet from becoming a bottleneck. In this way, any excessive pressure accumulation between the periphery of the rotor and the radial walls of the rotor chamber is avoided.

[0027] According to another aspect of the invention, the air outlet may be located on the periphery relative to the rotor chamber, wherein the periphery may be smaller than the rotational periphery of the rotor. In another aspect of the invention, it is anticipated that the air outlet may be an annular opening, which may be radially outwardly limited by the rotor chamber and radially inwardly limited by the centrifuge's shaft housing. According to another aspect of the invention, the oxy-acetylene cutting disc may protrude radially between the bottom portion of the chamber and the rotor. In another aspect of the invention, it is anticipated that the oxy-acetylene cutting disc may be in axial contact with the centrifuge's shaft housing. By using this design, structural advantages are achieved in terms of the through-passage between the rotor shaft and any bearings against the rotor housing, while maintaining a sufficiently large air outlet to effectively exhaust air from the rotor chamber.

[0028] In another aspect of the invention, it is foreseeable that air can be guided through the air outlet of the rotor chamber, and can be further guided around the motor, and can exit the centrifuge through the outlet hole. Thus, air inadvertently drawn into the rotor chamber of the ventilated centrifuge can also be used for motor cooling purposes. By guiding the air through the air guide and subsequently to the air outlet leading to the motor, the motor is prevented from preheating the air drawn into the air inlet.

[0029] According to another aspect of the invention, the gas cutting disc can be arranged between the rotor and the cover, wherein the air inlet can be arranged in the bottom portion of the rotor chamber, and the air outlet can be arranged in the cover of the centrifuge. This design has advantages in certain applications where it is not possible to introduce ventilation air from the side of the cover of the ventilated centrifuge for configuration or analytical reasons.

[0030] It will be apparent to those skilled in the art that the gas cutting discs described in the various embodiments above can also be used as a standalone device for improving airflow within existing ventilated centrifuges. Attached Figure Description

[0031] The invention will now be described in conjunction with the following non-limiting drawings. Further advantages of this disclosure will become apparent when considered in conjunction with the drawings, through reference to the specific embodiments, in which:

[0032] - Figure 1 A schematic cross-sectional view is shown through the rotor chamber of a ventilated centrifuge;

[0033] - Figure 2 A three-dimensional view of the gas cutting disc is shown;

[0034] - Figure 3 It shows relative to passing through according to Figure 1 A schematic cross-section of the rotor chamber of a ventilated centrifuge showing the airflow path; and

[0035] - Figure 4The bottom view of the gas cutting disc shows the airflow path through the airflow channel at least partially defined by the gas cutting disc. Detailed Implementation

[0036] Figure 1 A cross-section of a centrifuge 1 with a rotor chamber 2 is shown, wherein the rotor chamber 2 contains a rotor 3 that is driven to rotate by a shaft 4 defining a rotation axis R. The centrifuge 1 includes an air inlet 21 leading to the rotor chamber 2 and an air outlet 22 from the rotor chamber 2.

[0037] The rotor 3 is axially arranged between the air inlet 21 and the air outlet 22, and the rotatably fixed gas cutting disc 10 is arranged in the rotor chamber 2 between the air outlet 22 and the rotor 3. The gas cutting disc 10 is arranged concentrically with the rotation axis R, and the outer periphery 12 of the gas cutting disc 10 corresponds to the lower outer periphery 32 of the rotor.

[0038] The rotor chamber 2 opens upwards, and the top 23 of the chamber is covered by a cover 25, with the air inlet 21 disposed within the cover 25. The rotor chamber 2 is bowl-shaped, and the air outlet 22 is disposed in the bottom portion 24 of the rotor chamber 2. The air inlet 21 and the air outlet 22 are arranged concentrically with the rotation axis R and with the rotor 3 and the gas cutting disc 10.

[0039] The gas cutting disc 10 is in axial contact with the centrifuge shaft housing 42 and protrudes radially between the bottom portion 24 of the rotor chamber 2 and the rotor 3.

[0040] Now refer to Figure 2 and Figure 4 The gas cutting disc 10 defines an airflow channel 13 extending radially inward from its radially outer periphery 12 toward its central portion 15. The airflow channel 13 is further comprised of several air deflectors 11a-d, which are specifically implemented as protrusions relative to the axis of rotation R, axially projecting from the radially extending gas cutting disc 10. The air deflectors 11a-d are integrally formed with the gas cutting disc 10 and have a chamfer or radius 14 between the gas cutting disc 10 and their axial protrusions.

[0041] Air deflectors 11a-d extend in an arc shape from the center portion 15 of the gas cutting disc 10 to the outer periphery 12 of the gas cutting disc, more specifically and as shown from... Figure 2 and Figure 4As can be seen, the air deflectors 11a-d are tangential to the outer periphery 12 of the gas cutting disc 10 and are arranged spirally, opening against the rotation direction D of the rotor 3. These air deflectors 11a-d have multiple engagement features 17, which are specifically implemented here as bolt sockets for torque-resistant connection between the gas cutting disc 10 and the rotor chamber 2. The central portion 15 of the gas cutting disc 10 is axially offset from the outer portion 16 of the gas cutting disc 10. The central portion 15 of the gas cutting disc 10 has a through opening 18, such as... Figure 1 and Figure 3 As shown, the through opening is configured to be passed through the shaft 4 of the centrifuge 11.

[0042] As from Figure 3 and Figure 4 In the best visible part of the air, the air inlet 21, the air outlet 22, the rotor 3, the rotor chamber 2, and the gas cutting disc 10 form an airflow path 6 that extends from the air inlet 21 through the gap 35 between the outer periphery 32 of the rotor 3 and the axially extending wall 26 of the rotor chamber 2, and further across the airflow channel 13 to the air outlet 22.

[0043] The gas cutting disc 10 separates the radially inwardly guided air between the gas cutting disc 10 and the bottom portion 24 of the rotor chamber 2 from the rotor 3, and in particular from the surface 36 of the rotor 3 facing the bottom portion 24 of the rotor chamber 2.

[0044] from Figure 3 It can be further seen that the gas cutting disc 10 guides the airflow axially downward toward the air outlet 22, and the air guide plates 11a-d extend radially outward and radially inward beyond the air outlet 22. Figure 3 As can be further seen, the air inlet 21 has a smaller diameter than the air outlet 22, and the air inlet 21 also has a smaller cross-sectional area than the cross-sectional area of ​​the air outlet 22, although the air outlet 22 is specifically implemented as an annular opening, which is radially outwardly restricted by the rotor chamber 2 and radially inwardly restricted by the shaft housing 42 of the centrifuge 1.

[0045] As from Figure 3 As is evident, air is directed through the air outlet 22 of the rotor chamber 2, and thus can be further directed around the motor of the centrifuge, and can exit the centrifuge 1 through the outlet port, which is not shown in the accompanying drawings.

[0046] It should be understood that this disclosure is not limited to the above-described embodiments, and modifications and variations thereof will be obvious to those skilled in the art.

[0047] For example, it can be envisioned that the gas cutting disc is arranged between the rotor and the cover, with the air inlet located at the bottom portion of the rotor chamber and the air outlet located within the centrifuge cover. The airflow path then passes from the bottom of the rotor chamber through the gap between the axial walls of the rotor chamber, and is subsequently guided by the gas cutting disc in an air guide channel between the gas cutting disc and the cover. This implementation may be advantageous in certain applications where, for structural or analytical reasons, it is not possible to introduce ventilation air from the side of the cover into the ventilated centrifuge.

[0048] The features of the above embodiments can be combined with the features of the other embodiments described above in any suitable combination, as will be apparent to those skilled in the art, and the specific combinations of features described in the above embodiments should not be construed as limiting.

[0049] List of reference numerals

[0050] 1. Centrifuge

[0051] 2 Rotor Chamber

[0052] 3 rotors

[0053] 4-axis

[0054] 10 Gas Cutting Discs

[0055] 11a-d Air deflectors

[0056] 12 (outer perimeter of the gas cutting disc)

[0057] 13 Airflow Channels

[0058] 14. Chamfer, Radius

[0059] 15 (Central section of the gas cutting disc)

[0060] 16. External part (of the gas cutting disc)

[0061] 17. Joining feature

[0062] 18 Through-opening

[0063] 21 Air Inlet

[0064] 22 Air outlet

[0065] Top of Room 23

[0066] 24 Bottom section

[0067] 25 Cover

[0068] 26 Axial wall

[0069] 32 (outer periphery of the rotor)

[0070] 35 gap

[0071] 36 (rotor) faces

[0072] 42-axis housing

[0073] R Rotation axis

[0074] D. Direction of rotation

Claims

1. A centrifuge (1) having a rotor chamber (2), said rotor chamber comprising a rotor (3) driven by rotation of a shaft (4) defining a rotation axis (R), wherein: The centrifuge (1) includes an air inlet (21) and an air outlet (22) disposed in the bottom portion (24) of the rotor chamber (2), wherein: The rotor (3) is axially arranged between the air inlet (21) and the air outlet (22), characterized in that, A rotatingly fixed gas cutting disc (10) is arranged between the air outlet (22) and the rotor (3) within the rotor chamber (2); and The gas cutting disc (10) defines an airflow channel (13) extending radially inward from the radially outer periphery (12) of the gas cutting disc (10) toward the central portion (15) of the gas cutting disc (10).

2. The centrifuge (1) according to claim 1, characterized in that The gas cutting disc (10) is arranged concentrically with the rotation axis (R), and the gas cutting disc (10) has one or more air deflectors (11a-d) for deflecting air.

3. The centrifuge (1) according to claim 2, characterized in that The one or more air deflectors (11a-d) are arranged in a spiral, and the one or more air deflectors (11a-d) are tangent to the outer periphery of the gas cutting disc (10).

4. The centrifuge (1) according to claim 2, characterized in that The one or more air deflectors (11a-d) have a joint feature (17) for anti-torque connection between the gas cutting disc (10) and the rotor chamber (2).

5. The centrifuge (1) according to claim 1, characterized in that, The gas cutting disc (10) has a through opening (18) located at the central portion (15) of the gas cutting disc (10), and the through opening (18) is configured to be passed through by the shaft (4) of the centrifuge (1).

6. The centrifuge (1) according to claim 1, characterized in that, The air inlet (21) and / or the air outlet (22) are arranged concentrically with the axis of rotation (R).

7. The centrifuge (1) according to claim 1, characterized in that, The air inlet (21), the air outlet (22), the rotor (3), the rotor chamber (2), and the gas cutting disc (10) form an airflow path. The airflow path starts from the air inlet (21) located in the cover (25) of the centrifuge (1), passes through the gap (35) between the outer periphery (32) of the rotor (3) and the axial wall (26) of the rotor chamber (2), crosses the airflow channel (13) defined by the gas cutting disc (10), and reaches the air outlet (22).

8. The centrifuge (1) according to claim 1, characterized in that, The gas cutting disc (10) separates the radially inwardly guided air between the gas cutting disc (10) and the bottom portion (24) of the rotor chamber (2) from the rotor (3).

9. The centrifuge (1) according to claim 1, characterized in that, The outer periphery (12) of the gas cutting disc (10) corresponds to the outer periphery (32) of the rotor (3).

10. The centrifuge (1) according to claim 1, characterized in that, The air outlet (22) is located on the periphery of the rotor chamber (2) relative to the rotor chamber (2), wherein the periphery is smaller than the outer periphery (32) of the rotor (3).

11. The centrifuge (1) according to claim 1, characterized in that, The air outlet (22) is an annular opening that is radially outwardly defined by the rotor chamber (2) and radially inwardly defined by the shaft housing (42) of the centrifuge (1).

12. The centrifuge (1) according to claim 1, characterized in that, The gas cutting disc (10) protrudes radially between the bottom portion (24) of the rotor chamber (2) and the rotor (3).

13. The centrifuge (1) according to claim 1, characterized in that, The gas cutting disc (10) is in axial contact with the shaft housing (42) of the centrifuge (1).

14. The centrifuge (1) according to claim 1, characterized in that, The air is directed through the air outlet (22) of the rotor chamber (2), and the air is also directed around the motor of the centrifuge (1) and exits the centrifuge (1) through the outlet hole.

15. The centrifuge (1) according to claim 1, characterized in that, The gas cutting disc (10) is arranged between the rotor (3) and the cover (25) of the centrifuge (1), wherein the air inlet (21) is arranged in the bottom portion (24) of the rotor chamber (2) and the air outlet (22) is arranged in the cover (25) of the centrifuge (1).

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