JP2016179452A - Centrifugal machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a centrifugal machine capable of suppressing the occurrence of the self-excited vibration of a rotor caused by an aerodynamic factor and controlling vibration after the occurrence.SOLUTION: In a centrifugal machine 1 having a bowl 6 defining a rotor chamber 4, covering members (25a, 25b) covering the bowl 6 and the outer peripheral side and bottom surface of a heat insulation material 26 are disposed, and the covering member 25b is held by a plurality of iron balls 28 arranged in the recess 21 of a bottom surface protector 21. Consequently, the bowl 6 is made in a floating state to a housing 2 and further is slightly movable in a horizontal direction. Vibration-proof rubbers 29, 30 are interposed between the covering member 25a and an outer periphery protector 22, the moving force of the bowl 6 is suppressed and then the self-excited vibration of a rotor is suppressed.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a centrifuge (centrifuge) used to separate a sample, and particularly to suppress self-excited vibration of a rotor that is generated by an aerodynamic factor.

  The centrifuge includes a rotor capable of accommodating a plurality of sample containers filled with a sample therein, and a motor (rotation drive source) that rotationally drives the rotor in the rotor chamber, and rotates the rotor in the rotor chamber to generate centrifugal force. By acting, the sample in the sample container is centrifuged. Here, the structure of the conventional centrifuge 101 will be described with reference to FIG. In FIG. 4, the centrifuge 101 includes a box-shaped housing 2, and is partitioned into two upper and lower spaces by a partition plate 3 in the vicinity of the upper and lower centers inside the housing 2. In the upper space of the partition plate 3, a substantially cylindrical bowl 6 having an upper surface opened is placed, and on the outer peripheral side of the bowl 6, an outer peripheral protector 122 is disposed. The upper surface of the bowl 6 is closed or sealed by a door 5 that can be opened and closed by a hinge 14, thereby defining a rotor chamber 4. A refrigeration pipe 107 is wound around the bowl 6, and a cooling device (not shown) is connected to the refrigeration pipe 107. A heat insulating material 126 is provided on the outer peripheral side of the refrigeration pipe 107. The heat insulating material 126 can be formed by filling urethane foam into the cylindrical can 125.

  During the centrifugal separation operation, the compressor is operated under the control of a control device (not shown), and the interior of the rotor chamber 4 is maintained at a set desired temperature. The rotor 40 mounted on the drive shaft 9a via the crown 9b in the rotor chamber 4 includes a swing rotor main body 41, a plurality of buckets 42 mounted on the swing rotor main body 41, a storage cover 43 and a cover for storing these. 43a, which rotate integrally around the drive shaft 9a. A knob 45 is attached to the center of the lid 43, and a screw portion 46 is connected to the knob 45. In the example of FIG. 4, the swing rotor using the storage cover 43 is shown. However, the swing rotor main body 41 and the bucket 42 are directly attached to the drive shaft 9a without using the storage cover 43 having the lid 43a. Alternatively, an angle rotor (not shown) may be attached to the drive shaft 9a.

  A motor 9 as a rotational drive source is accommodated in a motor housing 8 on the lower side of the housing 2 that is partitioned up and down by a partition plate 3. The motor housing 8 is fixed to the partition plate 3 via a damper rubber 10. The holding member 11 is held. The motor 9 is arranged such that its drive shaft 9a extends in the vertical direction. The drive shaft 9a extends from a through hole formed in the bottom of the bowl 6 so as to reach the internal space of the rotor chamber 4, and a crown 9b for transmitting the rotational torque of the drive shaft 9a is provided at the upper end portion thereof. The rotor 40 is held by the crown 9b. The through hole 6 b of the bowl 6 is sealed with a seal rubber 17. As the rotor 40 rotates at a high speed, the bucket 42 swings around the swing axis by centrifugal force. The rotor 40 can be removed from the rotor chamber 4 to the outside in the state of the assembly as described above, and with the rotor 40 set in the centrifuge 101, the cover 43a of the accommodation cover 43 is removed and only the bucket 42 is removed. It is also possible to remove.

  An operation display unit 12 is provided on the inclined panel 13 on the upper rear side of the housing 2. The operation display unit 12 functions as an input unit for receiving input from the user and a display unit for displaying information to the user, but may be configured using a touch-type liquid crystal display. . The centrifuge 101 includes centrifuges such as information display on the operation display unit 12 and control of accepting operation input from the user, rotation control of the motor 9, and control of a cooling device (not shown) for flowing the refrigerant through the refrigeration pipe 107. A control device (not shown) for controlling the entire machine 101 is provided. The control device is an electronic circuit including a microcomputer, volatile and nonvolatile storage memories, and the like.

  When the rotor 40 of the centrifuge 101 is operated at atmospheric pressure, self-excited vibration may occur due to an aerodynamic factor applied to a rotating body such as the rotor 40. For example, as described in Patent Document 1, air is entrained by the rotation of the rotor 40, and the pressure distribution between the rotor 40 and the bowl 6 increases when the gap between the rotor 40 and the bowl 6 is small. The center of the rotor 40 moves in response to the resultant force F due to the air pressure distribution and the reaction force P caused by the damper rubber 10 which is an elastic body supporting the motor housing 8. When the center of the rotor 40 moves, the portion with a high pressure distribution also moves inside the bowl 6, so that the center of the rotor 40 draws a circular locus and vibrates and generates self-excited vibration.

  If self-excited vibration is generated during operation, the rotor 40 may swing greatly, and the rotor 40 may be detached and the motor 9 serving as the drive unit may be damaged. Therefore, in Patent Document 2, a protrusion is provided on the back of the door 5 facing the rotor chamber 4 so that the protrusion protrudes from the back of the door when operating a specific rotor 40 that is likely to generate self-excited vibration. did. This structure will be described with reference to FIG. In the centrifuge 201 of FIG. 5, a protrusion mechanism for the protrusion 233 is provided on the back side of the door 205 (the side facing the rotor chamber 204). The pop-out mechanism is constituted by a drive mechanism 231 that electrically operates the shaft 232, and is provided at two locations in the circumferential direction. The protrusion 233 is fixed to the tip of the shaft 232. The control device (not shown) has a structure that uses the protrusion 233 by identifying the rotor 40 in which self-excited vibration occurs, and in the case of the rotor 40 in which self-excited vibration is likely to occur, the protrusion 233 is transferred to the rotor 40 side. The protrusion 233 disturbs the air flow in the rotor chamber 4 to suppress self-excited vibration.

Japanese Patent Laid-Open No. 7-232103 JP 2013-169475 A

  In the conventional structure described with reference to FIG. 5, it is necessary to provide a protrusion mechanism for the protrusion 233 on the back side of the door 205, so that the structure becomes complicated. In addition, there is a possibility that the difficulty level of countermeasures against containment of fragments and the like when the rotor 40 is broken during operation is increased. Further, the projection 233 increases frictional heat with air, which is disadvantageous for cooling the rotor chamber 204. Therefore, there is a possibility that the difficulty of containment countermeasures such as debris when the rotor 40 is damaged during operation is increased.

The present invention has been made in view of the above background, and an object of the present invention is to provide a centrifuge capable of suppressing the occurrence of self-excited vibrations of the rotor caused by aerodynamic factors.
Another object of the present invention is to provide a centrifuge capable of suppressing the self-excited vibration of the rotor by moving the bowl slightly in the horizontal direction when the self-excited vibration is generated.

The characteristics of representative ones of the inventions disclosed in the present application will be described as follows.
According to one aspect of the present invention, a rotor that holds a sample and is rotated by a rotational drive source, a bowl that is provided with an opening at an upper end and that defines a rotor chamber that houses the rotor, and an opening of the bowl In a centrifuge having a door for closing the part, a rotary drive source and a bowl, and having a casing for holding the door, the bowl is held movably in the horizontal direction with respect to the casing. . An elastic means such as anti-vibration rubber is interposed between the bowl and the casing to limit the amount of movement of the bowl relative to the casing and to attenuate the moving speed. The housing includes a horizontal partition plate on which the bowl is placed, and a sliding member is provided to hold the bowl so that it can move horizontally relative to the partition plate. The bowl is slidably held on the sliding member. Is done.

  According to another feature of the present invention, a metal tube for flowing a coolant is disposed so as to be in contact with the outer peripheral side of the bowl, a heat insulating material is provided on the outer peripheral side of the metal tube and below the bottom surface of the bowl, and the metal tube And the insulation can move horizontally with the bowl. In addition, a cylindrical cover member that covers the outer peripheral side of the heat insulating material is provided, a cylindrical protector is provided on the outer peripheral side of the cover member so as to be spaced apart from the cover member, and the elastic means is provided between the cover member and the protector. To be provided. Since the heavy cylindrical protector is fixed and moved only on the bowl side, the slidability on the bowl side is improved. Furthermore, a circular protector member made of a thick metal plate is provided on the partition plate, a base member is provided below the heat insulating material, and a sliding member is provided between the protector and the base member. For example, a plurality of recesses are formed at equal intervals in the circumferential direction of the protector member, a metal ball that can move within the recess is provided, and the base member is placed on the upper side of the metal ball. If formed in this way, the bowl can be slid in the horizontal direction with a simple structure, so that the self-excited vibration of the rotor can be effectively suppressed.

  According to still another feature of the present invention, the elastic means is a rubber ring continuously arranged in the circumferential direction or a rubber piece continuously arranged in the circumferential direction, so that the manufacturing cost can be suppressed. In addition, there is no fear of failure and a good seismic control effect can be expected over a long period of time. In addition, a circular through hole is provided at the center of the bottom of the bowl, a rotary shaft extends upward from the through hole, and a seal member that seals between the rotary shaft and the through hole is provided. Because it is made of rubber or resin that allows slight movement in the horizontal direction, it is possible to allow slight horizontal movement (radial direction and rotational direction) of the bowl part without moving the rotation shaft of the rotation drive source. .

  According to the present invention, by providing the elastic means on the outer peripheral side of the bowl, it is possible to compensate for the deficiency of air attenuation between the rotor and the bowl against the whirling of the rotor, and to prevent the occurrence of self-excited vibrations. Therefore, suppression after the occurrence can be achieved. Further, even if the vibration control mechanism of this embodiment is adopted, the frictional heat in the rotor chamber does not increase, and electronic control that requires identification of the rotor is not required, and the door structure is simple. Since it is not necessary to modify the configuration, the present invention can be implemented while suppressing an increase in manufacturing cost. Furthermore, since the heavy weight protector is not included in the portion that is slid in the horizontal direction in the present embodiment, there is no influence on the containment measures when the rotor is broken.

It is a longitudinal cross-sectional view of the rotor chamber 4 vicinity of the centrifuge 1 which concerns on the Example of this invention. It is a top view of the single body of the bottom protector 21 of FIG. It is a fragmentary sectional view of the bottom face part of the bowl 6 of FIG. It is a front view of the conventional centrifuge, and has shown the principal part with sectional drawing. It is a figure for demonstrating the mechanism which suppresses the self-excited vibration of the conventional centrifuge.

  Embodiments of the present invention will be described below with reference to the drawings. In the following drawings, the same parts as those in the centrifuge of FIG. 4 are denoted by the same reference numerals, and repeated description is omitted. Further, in the present specification, description will be made assuming that the upper and lower sides, front and rear, left and right are directions shown in the drawing.

  FIG. 1 is a longitudinal sectional view of the vicinity of a rotor chamber 4 of a centrifuge 1 according to an embodiment of the present invention. The entire structure of the centrifuge 1 is basically the same as that of the conventional centrifuge 101 shown in FIG. 4, and different reference numerals are given to different components. The centrifuge 1 is provided with a bowl 6 for forming the rotor chamber 4 inside a housing 2 made of box-shaped sheet metal or plastic, and the opening of the rotor chamber 4 is opened and closed by a door 5. The door 5 can be rotated in the vertical direction around a hinge (not shown). A door packing 15 made of an elastic material such as rubber is fitted to the periphery of the opening 6 a at the upper end of the bowl 6, and the door 5 is in close contact with the door packing 15, thereby ensuring airtightness in the rotor chamber 4. Is done. The bowl 6 is a substantially cup-shaped container having an opening 6a on the upper side, and has a cylindrical portion 6c having a cylindrical shape and a bottom portion 6d having a disk shape. A circular through hole 6b for allowing the motor housing 8 to penetrate from the inside of the bowl 6 to the lower side is formed near the center of the bottom surface portion 6d. The through hole 6b is drawn upward (or pressed) upward, and rubber seal rubbers 17 are provided on the upper and outer peripheral sides thereof. A through hole 17a is formed on the inner peripheral side of the seal rubber 17 so as to pass through the small diameter portion 8a on the upper portion of the motor housing 8. The outer periphery of the seal rubber 17 is fitted downward from the upper end of the raised through hole 6b. Thus, sealing is performed so that air and water do not leak from between the narrow diameter portion of the motor housing 8 and the bowl 6.

  A refrigeration pipe 7 is wound around the outer periphery of the bowl 6 and connected to a compressor and a condenser of a cooling device (not shown). The refrigeration pipe 7 is a metal pipe such as a copper pipe, for example. The refrigeration pipe 7 is wound around the outer periphery of the bowl 6, and the bowl 6 can be cooled by flowing a coolant through the inside thereof. A heat insulating material 26 made of a foaming agent or the like is formed outside the refrigeration pipe 7. As the heat insulating material 26, foamed polystyrene, foamed urethane, or the like can be used. Here, a metal cylindrical tube 25a spaced from the refrigeration pipe 7 by a predetermined distance is provided on the outer peripheral side of the refrigeration pipe 7, and the lower side of the bowl 6 is provided. A metal annular plate 25b is provided at a predetermined distance from the bowl 6, and a space between them is filled with a urethane material that comes out in the form of a mousse-like foam, and is hardened. In addition, the manufacturing method of the heat insulating material 26 is arbitrary, You may make it use the heat insulating member shape | molded previously, and may manufacture it with another manufacturing method. In this embodiment, the metal cylindrical tube 25a and the annular plate 25b are used as the mold of the heat insulating material 26 manufactured by filling the foaming agent. However, the cylindrical tube 25a and the annular plate 25b are formed of the heat insulating layer. Not only functions as a mold for forming, but also serves as an elastic means between the outer protector 22 and the role as a base member joined to a sliding member that allows the bowl 6 to move slightly in the horizontal direction. It plays a role as a holding member for holding the vibration rubbers 29 and 30. The cylindrical tube 25a and the annular plate 25b are preferably fixed by welding or adhesion. Although not shown here, the end of the wound refrigeration pipe 7 is more than the partition plate 3 through a through hole for penetrating the refrigeration pipe 7 formed in the annular plate 25b, the bottom protector 21, and the partition plate 3. It is connected to the cooling device arranged on the lower side.

  A cylindrical spacer ring 27 is interposed between the annular plate 25 b and the bowl 6 in the inner peripheral portion. This prevents the foaming agent filled at the time of manufacture from leaking to the inside of the through-hole 6b of the bowl 6, and also serves to maintain the bowl 6 and the annular plate 25b at a predetermined distance. The spacer ring 27 is, for example, a synthetic resin molded product, and screw holes are formed at predetermined intervals in the circumferential direction. The spacer ring 27 is attached to the partition plate 3 together with the seal rubber 17, the bowl 6, and the annular plate 25b by screws 23 passing through the screw holes. Screwed. In the present specification, the term “screw” refers to a fixing means provided with a spiral groove along the outer peripheral surface of a cylinder or cone, and refers to a bolt or screw used or not used in combination with a nut. It is described as including various screws such as studs, pan screws, flat head screws, and the like.

  A protector member is disposed around the rotor chamber 4 of the centrifuge 1. The protector is mainly constituted by two cylindrical outer protectors 22 disposed on the outer peripheral side and a bottom protector 21 disposed on the lower side of the bottom surface portion 6 d of the bowl 6. The outer periphery protector 22 is a metal cylindrical tube having a thickness of about several mm to several tens of mm, and the section fixed to the partition plate 3 with screws 33 cannot be moved in the radial direction by the L-shaped protector holder 32. Retained. The bottom protector 21 is a thick metal plate having a thickness of about several millimeters to several tens of millimeters, for example, a circular iron plate, and is fixed to the partition plate 3 of the housing 2 with screws 24 so as not to move in the horizontal direction. The weights of the outer protector 22 and the bottom protector 21 are very heavy, depending on the diameter of the bowl 6, ranging from several tens of kg to over 100 kg.

  The bowl 6 is held in a so-called floating state so as to be movable by a minute distance in the horizontal direction in the inner space of these protectors. The horizontal direction means that it can move both in the radial direction and in the circumferential direction, but the maximum movable distance is only about 2 mm, which is very small. Further, it is not necessary to positively move the rotor 40 in the axial direction (vertical direction) of the rotating shaft. In order to maintain such a movable state of the bowl 6 in the horizontal direction, concave portions 21d are formed at a plurality of circumferential positions of the bottom protector 21, for example, at four equally spaced locations, and the iron balls 28 are accommodated therein. By mounting the annular plate 25b on the iron ball 28, the annular plate 25b on which the bowl 6 is mounted can be moved by a small distance in the horizontal direction (in the radial direction and the circumferential direction in this case) by the principle of rolling. It becomes. The movable distance is determined by the movable range of the iron ball 28 in the recess 21d, and the size of the outer diameter of the recess 21d is set depending on how much the movable range is set. The bottom surface of the recess 21d is formed flat so that the iron ball 28 can easily roll. A predetermined gap 31 is provided between the cylindrical tube 25a and the outer protector 22 so that the outer protector 22 accommodating the bowl 6 does not come into contact with each other even if it moves in the horizontal direction. 30 are interposed. The anti-vibration rubbers 29 and 30 are elastic means such as rubber rings that are continuous in the circumferential direction or rubber pieces that are arranged intermittently. Here, ring-shaped grooves are formed in the circumferential grooves formed on the outer surface of the cylindrical tube 25a. A rubber member is attached.

  FIG. 2 is a top view of a single body of the bottom protector 21 of FIG. The bottom protector 21 is a substantially annular plate having a large opening 21a formed on the inner peripheral side, and four screw holes 21b and four screw holes 21c are formed from the inner peripheral side. A recess 21d is formed on the outer peripheral side of the screw hole 21c. Here, the outer edge shape of the recess 21d is circular. Actually, a through-hole is formed through two of the input side and the output side of the refrigeration pipe 7, but the illustration thereof is omitted here. In FIG. 2, four recesses 21d are provided. However, at least three recesses 21d may be provided at equal intervals in the circumferential direction.

  FIG. 3 is a partial cross-sectional view of the bottom portion of the bowl 6 of FIG. A circular through hole 6b through which the motor 9 passes is formed at the bottom of the bowl 6, and the through hole 6b is formed in a cylindrical shape that rises substantially vertically from the bottom surface of the bowl 6. The rising shape of the through hole 6b is formed by pressing. The spacer ring 27 is a separate part made of, for example, metal or plastic, and is configured separately from the bowl 6, and is fixed to the bowl 6 by a method such as screwing or bonding. A seal rubber 17 is attached to a circular peripheral edge on the upper side of the through hole 6b, and seals between the drive shaft 9a and the through hole 6b of the bowl 6 so as to cover the upper part of the motor 9. The seal rubber 17 is a seal member made of an elastic material such as rubber, and a metal reinforcing ring 18 is bonded to the upper surface and the outer peripheral surface of a substantially half of the outer peripheral side. Since the reinforcing ring 18 covers only the outer portion of the seal rubber 17, the seal rubber 17 allows the bowl 6 to move slightly in the horizontal direction due to its elastic force. The seal rubber 17 having the reinforcing ring 18 covers the upper end opening of the through hole 6b, and high airtightness in the rotor chamber 4 is ensured. A through hole for allowing the screw 23 to pass therethrough is formed in the upper surface near the outer periphery of the seal rubber 17 and the reinforcing ring 18. Similarly, through holes for allowing the screws 23 to pass therethrough are formed in the inner peripheral portion of the bowl 6, the spacer ring 27, the annular plate 25 b, and the bottom protector 21. Here, the size of the through hole through which the screw 23 of the seal rubber 17, the reinforcing ring 18, the bowl 6, the spacer ring 27, and the annular plate 25 b passes is formed so as to open a gap of about 2 mm with the screw 23. . In addition, since a resin washer 19 having good slidability is interposed between the head of the screw 23 and the reinforcing ring 18, the bowl 6 and the members (25a, 25b, 26, 27) that move accompanying the bowl 6 are made of iron. The sphere 28 allows slight movement in any of the horizontal directions, that is, in the radial direction and the circumferential direction. Since the bottom protector 21 does not need to slide with the bowl 6, the screw hole 21 b may have a size corresponding to the outer diameter of the screw 23.

  The distance between the bottom protector 21 and the annular plate 25b is about 3 mm. For this reason, the depth (length in the vertical direction) of the recess 21d is set to be smaller than the diameter of the iron ball 28 and larger than the radius. Further, if the diameter of the concave portion 21d is set to be about several tenths larger than the diameter of the iron ball 28, the iron ball 28 can move inside the concave portion 21d as the bowl 6 moves in the horizontal direction. As described above, since several iron balls that enable relative movement in the horizontal direction are provided between the bottom protector 21 and the bowl 6, the horizontal sliding of the bowl is possible, and the rotor itself Excitation vibration can be effectively suppressed. In the present embodiment, the recess 21d is formed in the bottom protector 21 and the iron ball 28, which is a metal ball, is disposed thereon, and the annular plate 25b is placed thereon, but the recess 21d and the iron ball 28 are provided. By providing not only sliding means but also flat bearings, thrust bearings, fluid lubrication bearings, and other known bearing means, the maximum movement distance of the bowl 6 by 10 mm or less in the horizontal direction with respect to the housing 2 and the partition plate 3 is provided. Alternatively, it may be configured to be relatively movable by about several mm. This is because the role of the sliding means is to reduce the friction between the member holding the bowl 6 (here, the annular plate 25b) and the bottom protector 21 as much as possible. If the friction can be reduced, a bearing can be used. A floating structure may be used by using other sliding members.

  According to the present embodiment, since the bowl 6 is slightly movable in the horizontal direction, generation or increase of self-excited vibration of the rotor 40 can be suppressed, so that the efficiency of the centrifuge can be increased and the drive shaft 9a. The wear and failure of other rotating parts can be reduced and the life of the centrifuge can be extended.

  As mentioned above, although this invention was demonstrated based on the Example, this invention is not limited to the above-mentioned Example, A various change is possible within the range which does not deviate from the meaning. For example, in the above-described embodiment, the elastic means interposed between the cylindrical tube 25a and the outer protector 22 is the anti-vibration rubber. You may make it use a seismic means.

DESCRIPTION OF SYMBOLS 1 Centrifuge 2 Case 3 Partition plate 4 Rotor chamber 5 Door 6 Bowl 6a Opening (opening part) 6b Through hole 6c Cylindrical part 6d Bottom face part 7 Refrigeration piping 8 Motor housing 8a Small diameter part 9 Motor 9a Drive shaft 9b Crown 10 Damper Rubber 11 Mounting member 12 Operation display section 13 Inclined panel 14 Hinge 15 Door packing 17 Seal rubber (seal member)
17a Through hole 18 Reinforcement ring 19 Resin washer 21 Bottom protector 21a Opening 21b Screw hole 21c Screw hole 21d Recess 22 Peripheral protector 23, 24 Screw 23b, 24b Nut 25a Cylindrical tube 25b Ring plate (base member) 26 Heat insulating material 27 Spacer ring 28 Iron ball 29, 30 Anti-vibration rubber 31 Clearance 32 Protector holder 33 Screw 40 Rotor 41 Swing rotor main body 42 Bucket 43 Housing cover 43a Lid 45 Knob 46 Screw part 101 Centrifuge 107 Refrigeration piping 121 Bottom protector 122 Outer side protector 123, 124 Screw 125 Cylindrical tube 126 Heat insulating material 127 Spacer ring 201 Centrifuge 204 Rotor chamber 205 Door 215 Door packing 231 Drive mechanism 232 Shaft 233 Projection

Claims (9)

A rotor that holds the sample and is rotated by a rotational drive source;
A bowl provided with an opening at an upper end and defining a rotor chamber for accommodating the rotor;
A door for closing the opening of the bowl;
In the centrifuge that houses the rotary drive source and the bowl and has a housing for holding the door,
A centrifuge characterized by holding the bowl movably in a horizontal direction with respect to the casing.   The centrifuge according to claim 1, wherein an elastic means is interposed between the bowl and the casing. The housing includes a horizontal partition plate on which the bowl is placed,
A sliding member for holding the bowl so as to be horizontally movable with respect to the partition plate is provided,
The centrifuge according to claim 2, wherein the bowl is held on the sliding member. A metal tube for flowing the coolant is disposed so as to contact the outer peripheral side of the bowl,
A heat insulating material is provided on the outer peripheral side of the metal tube and the lower side of the bottom surface of the bowl,
The centrifuge according to claim 3, wherein the metal tube and the heat insulating material are movable in a horizontal direction together with the bowl. A cylindrical covering member that covers the outer peripheral side of the heat insulating material is provided,
A cylindrical protector is provided on the outer peripheral side of the covering member so as to be spaced apart from the covering member by a predetermined distance.
The centrifuge according to claim 4, wherein the elastic means is provided between the covering member and the protector. A circular protector member made of a thick metal plate is provided on the partition plate,
A base member is provided under the heat insulating material;
The centrifuge according to claim 5, wherein the sliding member is provided between the protector and the base member.   A plurality of recesses are formed at equal intervals in the circumferential direction of the protector member, a metal ball movable in the recess is provided, and the base member is placed on the metal ball. 6. The centrifuge according to 6.   The centrifugal device according to any one of claims 2 to 7, wherein the elastic means is a rubber ring continuously arranged in the circumferential direction or a rubber piece continuously arranged in the circumferential direction. Machine. A circular through-hole is provided at the center of the bottom of the bowl, and a seal member is disposed so that a rotation shaft of the rotary drive source extends upward from the through-hole, and seals between the rotation shaft and the through-hole. Provided,
The centrifuge according to any one of claims 1 to 8, wherein the sealing member is made of rubber or resin that allows slight movement of the bowl in the horizontal direction.

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