JP7044685B2 - Centrifuge - Google Patents

Description

The present invention relates to a centrifuge with a cooling function for centrifuging and purifying a sample.

In a centrifuge, a sample container such as a centrifuge tube or a bottle containing a sample to be separated (for example, culture solution or blood) is generally held in a rotor, and the rotor is moved by a drive device such as a motor in a rotating chamber sealed by a door. The sample is separated and purified by rotating it at high speed and applying centrifugal force to the sample in the sample container. In the case of a centrifuge using a continuous rotor, it is possible to continuously inject the sample into the rotor from the outside of the centrifuge during rotation and continuously inject the sample from the inside of the rotor to the outside of the centrifuge during rotation. ..

Japanese Unexamined Patent Publication No. 2016-87483

In a centrifuge with a cooling function, dew condensation may occur on the inner wall of the rotating chamber containing the rotor. If the dew condensation water adhering to the inner wall of the rotating chamber is scattered by the air flow caused by the rotation of the rotor, there is a risk that the dew condensation water will be applied to the rotor.

The present invention has been made in recognition of such a situation, and an object of the present invention is to provide a centrifuge capable of suppressing the risk of dew condensation on the rotor.

One aspect of the invention is a centrifuge. This centrifuge
With the drive unit
The rotor rotated by the drive device and
A first storage unit having an opening and accommodating the rotor,
A door that can open and close the opening of the first storage unit,
It has a cooling device for cooling the first storage unit, and has.
The first storage unit has a second storage unit that is fixed to the first storage unit and stores the rotor.
The second storage unit has a vent that allows the space inside itself and the space outside itself and inside the first storage unit to communicate with each other.
The first vent is provided outside the outermost peripheral portion of the rotor in the radial direction of the rotor as viewed from the rotation center axis of the rotor.
The second vent is provided outside the rotation center axis of the rotor and inside the first ventilation port in the radial direction of the rotor as viewed from the rotation center axis of the rotor.

The vents have first and second vents.
The first vent is provided on the outer peripheral surface of the second storage portion.
The second vent may be provided on the upper surface of the second storage portion.

The air passage area provided by the first vent may be smaller than the air passage area provided by the second vent.

The first vent is provided at the upper part and the lower part of the second storage portion, respectively.
Even if the first closing member that closes one of the upper first vent and the lower first vent and the second closing member that closes the other can be selectively provided in the second storage portion. good.

Rotors of different sizes may be selectively mounted.

Due to the rotation of the rotor, the gas in the second storage section is discharged outside the second storage section and inside the first storage section, and instead of the discharged gas, the gas is discharged outside the second storage section and in the first storage section. The gas in the portion may flow into the second storage portion.

The length of the gap between the upper surface of the rotor and the non-rotating portion facing the upper surface may be in the range of 10 mm to 20 mm.

The length of the gap between the lower surface of the rotor and the non-rotating portion facing the lower surface may be in the range of 10 mm to 20 mm.

The length of the gap between the side surface of the rotor and the non-rotating portion facing the side surface may be in the range of 10 mm to 20 mm.

The gas in the first storage unit may be dehumidified by the cooling device.

The second storage portion may include a cylindrical portion having an opening and a lid portion that closes the opening of the cylindrical portion.

The second storage portion may be fixed to the first storage portion by welding or screwing.

The cooling device includes a compressor and an evaporator, and the evaporator may be a pipe wound around the outer periphery of the first storage portion.

The first storage unit may have a discharge port for discharging dew condensation water.

The rotor has a sample injection / injection section near its central axis.
The second storage unit may have a sample introduction unit at a position above the sample injection / injection unit.

A tubular flow path is connected to the sample introduction portion, and a tubular flow path is connected to the sample introduction portion.
A configuration may be used in which a sample can be continuously injected into the rotor from the outside through the sample injection / injection section, the sample introduction section, and the tubular flow path.

The rotor is provided with a magnet.
A sensor for detecting the magnetic field generated by the magnet may be provided in the second accommodating portion or the fixed portion of the driving device to detect the type, position, or rotation speed of the rotor.

It should be noted that any combination of the above components and a conversion of the expression of the present invention between methods, systems and the like are also effective as aspects of the present invention.

According to the present invention, it is possible to provide a centrifuge capable of suppressing the risk of dew condensation on the rotor.

A side sectional view of the centrifuge 1 according to the first embodiment of the present invention. Enlarged view of the main part of FIG. FIG. 3 is a perspective view of the inside of the rotor chamber 4 of the centrifuge 1, which is a cross-sectional view taken by cutting out a part of the second storage portion 30 and the first closing member 35. FIG. 3 is a perspective view of the body portion 31 and the lid portion 32 of the inner chamber 30, the first closing member 35, and the rotor 20 in an exploded state. The figure which made the body part 31 a cross section and looked at the inside of an inner chamber 30 from above. FIG. 5 is a diagram in which an arrow indicating the flow of airflow generated by the rotation of the rotor 20 is added. FIG. 5 is a view when the exhaust port 31a of the body portion 31 of FIG. 5 is tilted in the rotation direction of the rotor 20 with respect to the radial direction of the rotor 20. FIG. 7 is a diagram in which the flow of airflow generated by the rotation of the rotor 20 is added. The enlarged side sectional view of the main part of the centrifuge which concerns on Embodiment 2 of this invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. The same or equivalent components, members, etc. shown in the drawings are designated by the same reference numerals, and duplicate description thereof will be omitted as appropriate. Further, the embodiment is not limited to the invention but is an example, and all the features and combinations thereof described in the embodiment are not necessarily essential to the invention.

(Embodiment 1)
The centrifuge 1 according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 8. FIG. 1 defines the vertical direction of the centrifuge 1. In FIG. 2, the flow of the airflow generated by the rotation of the rotor 20 is indicated by an arrow.

The centrifuge 1 includes a frame 5 and a door 13 forming an outer shell portion. The frame 5 is a housing that houses each member constituting the centrifuge 1. The door 13 is rotatably supported by the upper end of the frame 5 and rotatably closes the upper opening of the frame 5 and the upper opening of the bowl 3. A heat insulating material 15 such as a foaming material is provided on the lower surface of the door 13 at a position that closes the upper opening of the bowl 3. An operation unit 17 for an operator to perform various operations is provided on the upper surface of the door 13.

A bowl 3 as a first storage portion is provided in the upper part of the frame 5. The bowl 3 is a cylindrical container with a bottom made of, for example, a stainless steel material. The bowl 3 is fixed to the frame 5 by screwing or the like. The rotor chamber 4 is an internal space of the bowl 3. A discharge port for draining dew condensation water is provided on the lower surface of the bowl 3. One end of the drain tube (drainage portion) 6 is connected to the discharge port. The other end of the drain tube 6 is located outside the frame 5. An evaporator 11 is wound around the bowl 3. The evaporator 11 is a cooling pipe and is provided to cool the rotor chamber 4. The periphery of the evaporator 11 is covered with a heat insulating material 9 such as a foaming material. The heat insulating material 9 also covers the lower surface of the bowl 3. A cylindrical protector 7 is arranged around the heat insulating material 9.

An inner chamber 30 as a second storage portion is provided in the bowl 3. The rotor 20 is rotatably stored and supported in the inner chamber 30. Preferably, the rotor 20 is removable, and a rotor having a size different from that of the rotor 20 can be stored and supported in the inner chamber 30. That is, it is preferable that the centrifuge 1 can selectively mount rotors having different sizes from each other. The rotor 20 is made of a titanium alloy, an aluminum alloy, or the like. As shown in FIGS. 2 to 4, the rotor 20 includes a main body portion 20a and a shaft portion 20b. The main body 20a has a disk shape and holds a sample to be centrifuged. The shaft portion 20b extends downward from the main body portion 20a. The output shaft of the drive device 21 enters the shaft portion 20b. The rotor 20 is rotationally driven by a drive device 21 such as a motor. The drive device 21 is attached to the frame 5 via a damping rubber which is an elastic member. The drive device 21 is located below the rotor 20 and extends from the inside of the inner chamber 30 and the bowl 3 to the bottom of the bowl 3.

The inner chamber 30 is fixed to the bowl 3 by screwing or welding. The inner chamber 30 may be fixed to the fixed portion of the drive device 21. The inner chamber 30 is made of an aluminum material. The material of the inner chamber 30 is preferably metal, but may be resin. The inner chamber 30 includes a body portion 31 and a lid portion 32. The body portion 31 is a cylindrical portion having an opening at the upper end. The lid portion 32 closes the upper opening of the body portion 31. The inner chamber 30 reduces the risk that the dew condensation water adhering to the inner wall of the bowl 3 constituting the rotor chamber 4 is scattered by the air flow due to the rotation of the rotor 20 and is applied to the rotor 20.

The inner chamber 30 has an exhaust port 31a as a first vent and an intake port 32a as a second vent. The exhaust port 31a and the intake port 32a communicate with each other the space inside the inner chamber 30 and the space outside the inner chamber 30 and inside the bowl 3. Six exhaust ports 31a are provided at equal intervals on the upper and lower portions of the outer peripheral surface of the body portion 31. The exhaust port 31a is provided outside the outermost peripheral portion of the rotor 20 in the radial direction of the rotor 20. The number of exhaust ports 31a may be appropriately determined according to the required cooling performance. The intake port 32a is provided on the lid portion 32 forming the upper surface of the inner chamber 30. The intake port 32a is provided outside the central axis 20a of the rotor 20 and inside the exhaust port 31a in the radial direction of the rotor 20. Six intake ports 32a are provided around the rotation axis of the rotor 20 at equal angle intervals. The number of intake ports 32a may be appropriately determined according to the required cooling performance.

A first closing member 35 is detachably provided in the inner chamber 30. The first closing member 35 is made of an aluminum material and is detachably attached to the inner chamber 30. The first closing member 35 has an annular shape and closes the lower exhaust port 31a. When the lower exhaust port 31a is blocked, the amount of airflow generated by the rotation of the rotor 20 that is exhausted from the upper exhaust port 31a increases. Since the upper exhaust port 31a is located at a position facing the outermost peripheral portion of the rotor 20, the cooling efficiency of the rotor 20 is improved as the amount of exhaust from the upper exhaust port 31a increases. The first blocking member 35 also has the effect of narrowing the space in contact with the rotor 20 in the inner chamber 30 and reducing wind damage. Further, since the exhaust port 31a is provided near the maximum outer diameter portion of the rotor 20, the gas in the inner chamber 30 can be efficiently discharged.

When a rotor having a size larger than that of the rotor 20 (for example, a rotor having a shape like the rotor 50 shown in FIG. 9) is stored and supported in the inner chamber 30, the first closing member 35 is removed. In this case, the lid portion 32 is used as a second closing member having a shape like the lid portion 33 shown in FIG. 9, and the upper exhaust port 31a is closed and exhausted from the lower exhaust port 31a to cool the rotor having a large size. Efficiency can be increased.

The air passage area by the exhaust port 31a (the total opening area of the exhaust ports 31a other than the exhaust port 31a blocked by the first closing member 35) is preferably the air passage area by the intake port 32a (the opening area of the intake port 32a). Is less than the sum of). As a result, the opening area of the exhaust port 31a can be minimized with respect to the air volume desired to be realized, the unevenness of the inner peripheral surface of the body portion 31 is reduced, and the wind loss is reduced.

The length G1 of the gap between the upper surface of the rotor 20, that is, the upper surface of the main body portion 20a of the rotor 20, and the lower surface of the lid portion 32, which is a non-rotating portion facing the upper surface, is preferably shown in FIG. It is in the range of 10 mm to 20 mm, more preferably in the range of 10 mm to 15 mm. The length G2 of the gap between the lower surface of the rotor 20, that is, the lower surface of the main body portion 20a of the rotor 20, and the upper surface of the first blocking member 35 which is a non-rotating portion facing the lower surface is preferably 10 mm to 20 mm. The range is, more preferably 10 mm to 15 mm. The length G3 of the gap between the outer peripheral surface of the rotor 20, that is, the outer peripheral surface of the main body portion 20a of the rotor 20, and the inner peripheral surface of the body portion 31 which is a non-rotating portion facing the outer peripheral surface is preferably long. It is in the range of 10 mm to 20 mm, more preferably in the range of 10 mm to 15 mm. The shorter the gap lengths G1, G2, and G3 are, the more advantageous it is in reducing wind damage, but the rotor 20 does not come into contact with the body portion 31, the lid portion 32, and the first closing member 35 even if the tolerances are accumulated. It is necessary to have a margin. From the viewpoint of the balance between wind loss reduction and design margin, the above ranges are appropriate for the respective gap lengths G1, G2, and G3.

As shown in FIG. 2, a magnet 26 is provided at the lower end of the shaft portion 20b of the rotor 20. A plurality of magnets 26 are provided around the rotation axis of the rotor 20. A sensor 24, which is a magnetic sensor such as a Hall element, is provided on the upper surface of the fixed portion of the drive device 21. The sensor 24 is arranged to face the magnet 26. The sensor 24 may be provided in the inner chamber 30. The sensor 24 can detect the arrangement position of the magnet 26 accompanying the rotation of the rotor 20 to identify the rotor, and can also detect the rotation speed and the rotation position. That is, the centrifuge 1 can grasp the state of the rotor by providing the rotor with a magnet and providing a sensor for detecting the magnetic field generated by the magnet in the second accommodating portion or the fixed portion of the driving device. ..

A condenser 25 and a compressor 27 are provided in the lower part of the frame 5. The evaporator 11, the condenser 25, the compressor 27, and the capillary tube 29 constitute a cooling device for cooling the bowl 3. In addition to cooling the inside of the rotor chamber 4, this cooling device separates the moisture in the air by adhering the moisture in the air in the rotor chamber 4 to the surface of the bowl 3 as frost. As a result, the gas in the rotor chamber 4 can be dehumidified, and the dehumidified air (gas) is supplied into the inner chamber 30 from the rotor chamber 4 into the inner chamber 30 by the air flow described later. When the frost (ice) adhering to the bowl 3 is melted, it is discharged from the drain tube. A control unit 23 is provided at a position above the condenser 25 in the frame 5. The control unit 23 includes a microcomputer and the like, and controls the entire operation of the centrifuge 1.

When the rotor 20 is rotated by the drive device 21, the gas in the inner chamber 30 passes through the exhaust port 31a on the upper outer peripheral surface of the body portion 31 and the inner chamber 30 as shown by arrows in FIGS. 2 and 6. It is discharged to the space outside and inside the bowl 3. Instead of the discharged gas, as shown by an arrow in FIG. 2, a gas in the space outside the inner chamber 30 and in the bowl 3, that is, a cooled gas in the rotor chamber 4, passes through the intake port 32a. It flows into the inner chamber 30.

In FIGS. 1 to 6, the case where the exhaust ports 31a are provided radially has been described. The extension direction of the exhaust port 31a may be inclined with respect to the radial direction of the rotor 20. FIG. 7 is a view when the exhaust port 31a is tilted in the rotation direction of the rotor 20 (counterclockwise in the illustrated example) with respect to the radial direction of the rotor 20. FIG. 8 is a diagram in which the flow of airflow generated by the rotation of the rotor 20 is added to FIG. 7. The position of the exhaust port 31a on the counterclockwise side of the rotor 20 is shifted counterclockwise from the opening on the rotor 20 side in the rotation direction of the rotor 20. As a result, the flow method of the airflow generated by the rotation of the rotor 20 and the extending direction of the exhaust port 31a are close to parallel (generally coincide with each other), so that the gas is smoothly discharged from the exhaust port 31a and the wind is damaged. Is reduced. However, from the viewpoint of workability, the extension direction of the exhaust port 31a is provided radially.

According to this embodiment, the following effects can be obtained.

(1) The centrifuge 1 has a cooling function, and dew condensation may occur on the inner wall of the rotor chamber 4 in which the rotor 20 is housed. If the dew condensation water adhering to the inner wall of the rotor chamber 4 is scattered by the air flow due to the rotation of the rotor 20, there is a risk that the dew condensation water will be applied to the rotor 20. In the centrifuge 1, since the rotor 20 is surrounded by the inner chamber 30, the risk of dew condensation on the rotor 20 can be suppressed.

(2) Since the rotor 20 is surrounded by the inner chamber 30, the volume of air around the rotor 20 can be reduced as compared with the case where the inner chamber 30 does not exist, and the wind damage of the rotor 20 can be reduced. By setting the lengths G1, G2, and G3 of the gaps shown in FIG. 2 to the above range, it is possible to suitably secure a balance between the reduction of wind damage and the design margin.

(3) Since the inner chamber 30 has an exhaust port 31a and an intake port 32a, the rotor 20 can be cooled by the air flow generated by the rotation of the rotor 20, and the temperature of the rotor 20 can be kept in the range of, for example, 20 ° C to 25 ° C. Can be kept constant.

(4) If the air passage area by the exhaust port 31a is made smaller than the air passage area by the intake port 32a, the opening area of the exhaust port 31a can be minimized with respect to the desired air volume, and the inside of the body portion 31 can be minimized. The unevenness of the peripheral surface is reduced, and the wind damage of the rotor 20 can be reduced.

(5) Since the first closing member 35 closes the lower exhaust port 31a of the body portion 31, the amount of exhaust gas from the upper exhaust port 31a located at a position facing the outermost peripheral portion of the rotor 20 increases, and the rotor 20 is cooled. Efficiency is increased. Further, by providing the first blocking member 35, the volume of air around the rotor 20 can be reduced, and the wind damage of the rotor 20 can be reduced.

(6) Since the inner peripheral surface of the inner chamber 30 is a cylindrical surface, wind damage of the rotor 20 can be reduced.

Hereinafter, an example of the wind loss reduction effect when the rotation speed of the rotor 20 is set to 16,000 rpm will be given. In the case of the configuration in which the inner chamber 30 and the first blocking member 35 were removed from the centrifuge 1, the wind loss was 249 W. In the case of the centrifuge 1 in which the exhaust port 31a and the intake port 32a of the inner chamber 30 are eliminated, the wind loss is 193 W. However, since the inner chamber 30 was cooled and air (gas) could not be supplied, the rotor 20 was hardly cooled. In the centrifuge 1 of the present embodiment, the rotor 20 can be cooled below the target cooling temperature range, and the wind loss at this time is 236 W. In the centrifuge 1, when the number of exhaust ports 31a is two, the rotor 20 can be cooled within the target cooling temperature range, and the wind loss at this time is 220 W. Therefore, a configuration in which two exhaust ports 31a are provided is a preferable example in the present embodiment.

(Embodiment 2)
FIG. 9 is an enlarged side sectional view of a main part of the centrifuge according to the second embodiment of the present invention. In FIG. 9, the flow of the air flow generated by the rotation of the rotor 50 is indicated by an arrow. In the centrifuge of the present embodiment, the rotor 20 is replaced with the rotor 50, the lid portion 32 is replaced with the lid portion 33 as the second closing member, and the first closing member is replaced with the centrifuge 1 of the first embodiment. 35 is gone.

The rotor 50 is made of a titanium alloy, an aluminum alloy, or the like. The main body portion 50a of the rotor 50 has a larger size in the vertical direction than the main body portion 20a of the rotor 20. The outermost peripheral portion of the rotor 50 faces the lower exhaust port 31a. The rotor 50 is a continuous rotor, and has a configuration in which a liquid sample is continuously injected from the outside of the centrifuge during rotation and the sample can be continuously poured out of the centrifuge during rotation.

The rotor 50 has a first sample injection / injection portion on the upper surface near the central axis portion of the rotor 50. A sample is injected into the first sample injection / dispensing portion of the rotor 50 from the tube 53 forming the tubular flow path via the seal portion 51. Further, the sample is dispensed from the first sample injection / dispensing portion of the rotor 50 to the tube 53 via the sealing portion 51. The seal portion 51 is a member that connects the fixed portion and the rotating portion so as not to leak liquid. Two tubes 53 are provided, one for injection and one for ejection. The tube 53 extends out of the centrifuge. The lid portion 33 has a through hole 33c forming the second sample injection / dispensing portion at a position on the extension of the central axis of the rotor 50, that is, a position above the first sample injection / dispensing portion. The seal portion 51 extends in the through hole 33c, and the tube 53 passes through the through hole 33c. The sample can be continuously injected into the rotor 50 from the outside of the centrifuge through the through hole 33c as the first sample injection / injection section, the through hole 33c as the second sample injection / ejection section, and the sample is centrifuged from the rotor 50. Can be continuously poured out of the machine.

The lid portion 33 has a closing portion 33b. The closing portion 33b is a cylindrical portion that extends downward from the upper surface of the lid portion 33 and is close to the inner peripheral surface of the body portion 31 of the inner chamber 30. The closing portion 33b closes the exhaust port 31a at the upper part of the body portion 31. The lower end surface of the closed portion 33b has a tapered shape (side surface shape of a truncated cone) so as to be substantially parallel to the outer peripheral surface of the rotor 50. The intake port 33a of the lid portion 33 is provided in the same manner as the intake port 32a of the lid portion 32 of the first embodiment. That is, the rotor has a first sample injection / dispensing section near its central axis, and the second storage section has a second sample injection / dispensing section at a position above the first sample injection / dispensing section. A tubular flow path is connected to the second sample injection / extraction section, and the sample is continuously injected into the rotor from the outside through the first sample injection / delivery section, the second sample injection / delivery section, and the tubular flow path. Or it is configured to be able to extract.

The length G4 of the gap between the upper surface of the rotor 50 and the lower surface of the lid 33, which is a non-rotating portion facing the upper surface, as shown in FIG. 9, is preferably in the range of 10 mm to 20 mm, and further. It is preferably in the range of 10 mm to 15 mm. The length G5 of the gap between the lower surface of the rotor 50 and the upper surface of the body portion 31 which is a non-rotating portion facing the lower surface is preferably in the range of 10 mm to 20 mm, more preferably 10 mm to 15 mm. It is a range. The length G6 of the gap between the outermost peripheral portion of the rotor 50 and the inner peripheral surface of the body portion 31 which is a non-rotating portion facing the outermost peripheral portion is preferably in the range of 10 mm to 20 mm, and further. It is preferably in the range of 10 mm to 15 mm.

Other points of the present embodiment are the same as those of the first embodiment. According to the first embodiment, the risk of dew condensation on the rotor 50 can be suppressed, the wind damage of the rotor 50 can be reduced, and the temperature of the rotor 50 can be kept constant in the range of, for example, 20 ° C to 25 ° C. Can produce the same effect as.

Although the present invention has been described above by taking the embodiment as an example, it is understood by those skilled in the art that various modifications can be made to each component and each processing process of the embodiment within the scope of the claims. By the way. Hereinafter, a modification example will be touched upon.

In the first embodiment, when a rotor having a large size is not used, the lower exhaust port 31a may be omitted, and a member having a shape in which the body portion 31 and the first closing member 35 are integrated is the body of the inner chamber 30. It may be a department. In the second embodiment, when a rotor having a small size is not used, the upper exhaust port 31a may be omitted.

1 centrifuge, 3 bowl (1st storage), 4 rotor chamber (rotary chamber), 5 frame, 6 drain tube (drainage), 7 protector, 9 insulation, 11 evaporator (evaporator), 13 doors, 15 Insulation material, 17 operation part, 20 rotor, 20a main body part, 20b shaft part, 21 drive unit, 23 control part, 24 sensor, 25 condenser, 26 magnet, 27 compressor, 29 capillary tube, 30 inner chamber (second) Storage section), 31 body section, 31a exhaust port (first vent), 32 lid section, 32a intake port (second vent port), 33 lid section (second closing member), 33a intake port (second vent port) ), 33b blockage, 33c through hole (second sample injection / injection section), 35 first block member, 50 rotor, 51 seal section, 53 tube

Claims (15)

With the drive unit
The rotor rotated by the drive device and
A first storage unit having an opening and accommodating the rotor,
A door that can open and close the opening of the first storage unit,
It has a cooling device for cooling the first storage unit, and has.
The first storage unit has a second storage unit that is fixed to the first storage unit and stores the rotor.
The second storage unit is provided with a vent for communicating the space inside itself and the space outside itself and inside the first storage unit with each other.
The vents have first and second vents.
The first vent is provided outside the outermost peripheral portion of the rotor in the radial direction of the rotor as viewed from the rotation center axis of the rotor.
The second vent is provided outside the rotation center axis of the rotor and inside the first ventilation port in the radial direction of the rotor as viewed from the rotation center axis of the rotor.
Centrifuge. The first vent is provided on the outer peripheral surface of the second storage portion.
The centrifuge according to claim 1, wherein the second vent is provided on the upper surface of the second storage portion. The centrifuge according to claim 2, wherein the area of the air passage provided by the first vent is smaller than the area of the air passage provided by the second vent. The first vent is provided at the upper part and the lower part of the second storage portion, respectively.
A claim that a first blocking member that closes one of the upper first vent and the lower first vent and a second closing member that closes the other can be selectively provided in the second storage portion. Item 2. The centrifuge according to item 2 or 3. The centrifuge according to claim 4, wherein rotors having different sizes can be selectively attached. Due to the rotation of the rotor, the gas in the second storage section is discharged outside the second storage section and inside the first storage section, and instead of the discharged gas, the gas is discharged outside the second storage section and in the first storage section. The centrifuge according to any one of claims 1 to 5, wherein the gas in the portion flows into the second storage portion. The centrifuge according to any one of claims 1 to 6, wherein the length of the gap between the upper surface of the rotor and the non-rotating portion facing the upper surface is in the range of 10 mm to 20 mm. The centrifuge according to any one of claims 1 to 7, wherein the length of the gap between the lower surface of the rotor and the non-rotating portion facing the lower surface is in the range of 10 mm to 20 mm. The centrifuge according to any one of claims 1 to 8, wherein the length of the gap between the side surface of the rotor and the non-rotating portion facing the side surface is in the range of 10 mm to 20 mm. The centrifuge according to any one of claims 1 to 9, wherein the gas in the first storage portion is dehumidified by the cooling device. The centrifuge according to any one of claims 1 to 10, wherein the second storage portion includes a cylindrical portion having an opening and a lid portion that closes the opening of the cylindrical portion. The centrifuge according to any one of claims 1 to 11, wherein the second storage portion is fixed to the first storage portion by welding or screwing. The centrifuge according to any one of claims 1 to 12, wherein the cooling device includes a compressor and an evaporator, wherein the evaporator is a pipe wound around the outer periphery of the first storage portion. The centrifuge according to any one of claims 1 to 13, wherein the first storage unit has a discharge port for discharging dew condensation water. The rotor has a sample injection section on the rotation center axis.
The centrifuge according to any one of claims 1 to 14, wherein the second storage unit has a sample introduction unit at a position above the sample injection unit.

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