JP4967841B2 - Centrifuge rotor and centrifuge provided with the same - Google Patents

Description

  The present invention relates to a centrifuge rotor used in the fields of medicine, pharmacy, genetic engineering, and the like, and a centrifuge separator equipped with the same.

  In general, in a centrifuge in which the maximum rotational speed of the rotor is about 10,000 to 15,000 rpm, the rotor chamber for rotationally driving the rotor is often operated in an atmospheric pressure state. In this case, it is known that frictional heat between the air generated during rotation of the rotor and the rotor increases. In order to suppress this frictional heat, the surface of the rotor may be made as uneven as possible. For this purpose, the upper part of the sample holding hole for holding the sample is covered with a cover (for example, Patent Documents). 1).

  In addition, in a centrifuge, air is taken into the rotor chamber from the outside of the centrifuge using a method in which the rotor chamber is forcibly cooled by a refrigerator to suppress heat generation, or the flow of air when the rotor rotates. The method of air cooling is adopted.

  The rotor used in such a centrifuge is generally fixed to the drive shaft of the centrifuge to prevent the occurrence of vibration due to the influence of air flow and pressure generated during rotation. However, since a plurality of types of rotors may be used in the same centrifuge, it is necessary to detachably attach the rotor in consideration of user convenience.

  Here, FIG. 6 shows an example of a rotor fastening structure in which the upper part of the sample holding hole is covered with a cover.

  FIG. 6 is a cross-sectional view of the fastening portion of the rotor, and the rotor 101 is configured such that a cover 103 is detachably attached to the upper surface of the rotor body 102. A circular hole-like coupling portion 102a into which the tip portion of the shaft 135 is inserted is formed.

  A screw portion 102c is formed on the outer periphery of a boss portion 102A formed at the center of the rotor body 102 (around the coupling portion 102a), and the rotor 101 is connected to the drive shaft on the upper end surface of the boss portion 102A. A nut 104 to be attached to the upper end screw portion 135a of 135 is screwed so as to be movable in the direction of the central axis N (vertical direction in FIG. 6) with a disc spring 105 interposed therebetween. A cylindrical fixing holder 106 is screwed onto the threaded portion 102c of the boss portion 102A so that it does not fall off from the rotor body 102.

  On the other hand, a circular through hole 103a centering on the central axis N is formed at the center of the cover 103, and the cover 103 is detachably attached to the rotor body 102 by a substantially cylindrical handle 107.

  The handle 107 includes a small-diameter cylindrical shaft portion 107 </ b> A formed at the lower end portion and a large-diameter cylindrical grip portion 107 </ b> B formed above the shaft portion 107 </ b> A. The inner diameter of the through hole 103a is set slightly smaller, and the outer diameter of the grip portion 107B is set larger than the inner diameter of the through hole 103a. The handle 107 and the cover 103 are integrally formed by the ring stopper 110. A screw portion 107a is formed on the inner periphery of the shaft portion 107A of the handle 107, and a circular fitting hole 107b is formed at the center of the grip portion 107B.

Thus, when the user attaches the rotor body 103 to the front end portion of the drive shaft 135, the front end portion of the drive shaft 135 is passed through the coupling portion 102 a of the rotor body 102 and the screw formed on the front end portion of the drive shaft 135. The nut 104 is fastened to the portion 135a. The screw portion 107a formed on the inner periphery of the shaft portion 107A is screwed into the screw portion 106a of the fixed holder 106, and the handle portion 107B is gripped and the handle 107 is rotated to connect the screw portion 107a of the shaft portion 107A to the screw of the fixed holder 106. If the cover 106 is tightened, the cover 103 can be fastened to the rotor body 102 by the handle 107.
JP-A-6-190303

  However, in the above fastening configuration, as shown in FIG. 6, the nut 104 is not completely screwed into the screw portion 135a of the drive shaft 135, and the rotor 101 and the drive shaft 135 are not fastened. A cover 103 can be attached to the rotor body 102. If the rotor 101 is operated in a state where the rotor 101 is not fastened to the drive shaft 135 in this way, slip occurs between the drive shaft 135 and the rotor body 102, and rotational torque from the drive shaft 135 is transmitted to the rotor 101. There is a problem that the desired centrifugation cannot be performed. Further, when the drive shaft 135 is rotated in a state where the rotor 101 is not completely fastened, even if the rotational torque is transmitted to the rotor 101, abnormal vibration may occur during the rotation.

  In the conventional fastening structure shown in FIG. 6, a disc spring 105 is provided between the rotor body 102 and the nut 104 so that the nut 104 does not loosen. It is difficult to prevent the occurrence of vibration at the time, and when the nut 104 is forgotten to be tightened, the rotor 101 is not fixed and abnormal vibration occurs.

  The present invention has been made in view of the above problems, and the object of the present invention is for a centrifuge capable of preventing the occurrence of abnormal vibration by preventing rotation in a state where the drive shaft is not fastened. An object of the present invention is to provide a rotor and a centrifuge provided with the rotor.

In order to achieve the above object, the invention described in claim 1 includes a rotor body that accommodates and rotates a sample, a fastening member for fastening the rotor body to a drive shaft, a handle attached to the rotor body, In the centrifuge rotor having a cover that is detachably attached to the rotor body by the handle, a bag- like portion is formed on the handle , and an outer wall of the fastening member is formed on an upper wall of the bag-like portion of the handle. A through hole having a small inner diameter, and when the fastening member is not fastened to the drive shaft, the fastening member contacts the bag-like portion of the handle to prevent the handle from being screwed into the rotor body. It is characterized by doing so.

  According to a second aspect of the present invention, the height H1 from the starting position of the threaded portion of the rotor body to the upper end surface of the fastening member in a state where the fastening member is not tightened from the lower end surface of the handle to the inner end surface of the bag-like portion. The height is set to be equal to or higher than H2 (H1 ≧ H2).

A third aspect of the invention is characterized in that a centrifuge is configured including the centrifuge rotor according to any one of the first and second aspects.

  According to the present invention, a bag-like portion is formed on the handle, and when the fastening member is not fastened to the drive shaft, the fastening member abuts on the bag-like portion of the handle to screw the handle to the rotor body. As a result, the handle cannot be tightened even if the handle is rotated in order to attach the cover to the rotor body, thereby notifying the user that the fastening member has been forgotten to be tightened. Accordingly, the cover cannot be attached unless the fastening member is securely fastened and the rotor body is completely fastened to the drive shaft. The user turns the handle after the rotor body is fastened to the drive shaft by the fastening member. The desired centrifugal separation can be performed by rotationally driving the rotor to which the cover and the cover are attached. For this reason, it is possible to prevent the occurrence of the problem of forgetting to tighten the fastening member and rotationally driving the rotor without fastening the rotor to the drive shaft, and reliably transmitting the drive torque from the drive shaft to the rotor. The rotor can be rotated at a predetermined speed to stably perform desired centrifugation, and abnormal vibration of the rotor can be reliably prevented.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  FIG. 1 is a cutaway side view of a centrifuge according to the present invention. The illustrated centrifuge 30 includes a motor 31, which is a driving device, a rotor chamber 32, and the like. It is fixed to the frame 34 by a motor support 33 made of rubber or the like.

  The upper portion of the motor 31 protrudes into the rotor chamber 32, and the rotor 1 according to the present invention is attached to the tip of the drive shaft 35 of the motor 31. A door 36 is installed in the upper portion of the rotor chamber 32, and the rotor 1 is attached and detached from above the rotor chamber 32 by opening the door 36 as indicated by a broken line.

  Next, a specific configuration of the rotor 1 according to the present invention will be described with reference to FIGS.

2 is a front sectional view of a rotor according to the present invention, FIGS. 3 and 4 are enlarged detail views of a portion A in FIG. 2, and FIG. 5 is an exploded partial sectional view of the rotor.

  The rotor 1 is configured by attaching a substantially disc-shaped detachable cover 3 to an upper surface of a substantially truncated cone-shaped rotor body 2, and a drive shaft 35 of a motor 21 is provided at the center of the rotor body 2. A circular hole-shaped coupling portion 2a is formed into which the tip portion is inserted. In addition, a plurality of circular hole sample body holding portions 2b are formed obliquely on the outer peripheral portion of the rotor body 2, and these sample body holding portions 2b contain test tubes containing samples to be centrifuged. A sample holding container (not shown) is inserted.

  Further, a screw portion 2c is formed on the outer periphery of the boss portion 2A formed at the center of the rotor body 2 (around the coupling portion 2a), and the rotor 1 is connected to the drive shaft on the upper end surface of the boss portion 2A. A nut 4 as a fastening member to be attached to the threaded portion 35a of the 35 is screwed so as to be movable in the central axis N direction (vertical direction in the figure) with a disc spring 5 interposed therebetween. A cylindrical fixing holder 6 is screwed onto the screw portion 2c of the boss portion 2A so that the spring 5 does not fall off the rotor body 2. A hexagonal hole 4 a is formed at the center of the upper end of the nut 4, and a screw portion 6 a is formed at the outer periphery of the lower end of the fixed holder 6.

  On the other hand, a circular through hole 3a centering on the central axis N is formed at the center of the cover 3, and the cover 3 is detachably attached to the rotor body 2 by a substantially cylindrical handle 7. Yes.

  The handle 7 is a cap nut-shaped member, and is composed of a small-diameter cylindrical shaft portion 7A formed at the lower end portion and a large-diameter cylindrical grip portion 7B formed thereabove. A bag-like portion 7C is integrally formed at the center of the portion 7B. Here, the outer diameter of the shaft portion 7A is set slightly smaller than the inner diameter of the through hole 3a of the cover 3, and the outer diameter of the grip portion 7B is set larger than the inner diameter of the through hole 3a. A screw portion 7a is formed on the inner periphery of the shaft portion 7A of the handle 7, and a fitting hole 7b is formed inside the bag-like portion 7C. A circular through hole 7c for inserting a tool (not shown) such as a hexagon wrench is formed at the center of the upper wall of the bag-like portion 7C of the handle 7. Here, as shown in FIG. 5, the inner diameter φD1 of the through hole 7c is set smaller than the outer diameter φD2 of the nut 4 (φD1 <φD2).

  Thus, the handle 7 has its shaft portion 7A passed through the through hole 3a of the cover 3 from above, and the screw portion 7a formed on the inner periphery of the shaft portion 7A is screwed to the screw portion 6a of the fixing holder 6. The cover 3 is attached to the rotor body 2 by grasping the grip portion 7B and turning the handle 7 to tighten the screw portion 7a of the shaft portion 7A to the screw portion 6a of the fixing holder 6. At this time, the outer periphery of the cover 3 is fixed by the outer periphery of the rotor body 2 by fitting with the outer periphery of the rotor body 2 as shown in FIG.

  When the cover 3 is attached to the rotor body 2 by the handle 7 as described above, the outer periphery of the fixed holder 6 is fitted into the fitting hole 7b formed in the grip portion 7B of the handle 7, and the lower surface of the grip portion 7B is covered. The fitting hole 7b and the outer periphery of the fixed holder 6 and the grip 7B and the upper surface of the cover 3 are hermetically sealed by elastic seal rings 8 and 9 such as O-rings. The cover 3 is attached so as not to fall off the handle 7 by a retaining ring 10 fixed to the outer periphery of the shaft portion 7A of the handle 7. The distance between the lower surface of the grip portion 7B of the handle 7 and the retaining ring 10 is set to be slightly larger than the thickness of the cover 3, and when the cover 3 is attached as shown in FIG. 3 and the retaining ring 10 are formed so that a minute gap is formed.

  Thus, when the user attaches the rotor body 2 to the tip of the drive shaft 35, the screw formed on the tip of the drive shaft 35 passes through the coupling portion 2 a of the rotor body 2 through the tip of the drive shaft 35. The nut 4 is fastened to the portion 35a. Thereafter, in order to fasten the cover 3 to the rotor body 2 by the handle 7, the screw portion 7a formed on the inner periphery of the shaft portion 7A is screwed into the screw portion 6a of the fixed holder 6, and the handle 7B is gripped by gripping the grip portion 7B. To tighten the screw portion 7a of the shaft portion 7A to the screw portion 6a of the fixed holder 6.

  Incidentally, as shown in FIG. 4, in order to attach the cover 3 to the rotor body 2 in a state where the nut 4 is lifted from the fastening position because the user forgot to fasten the nut 4 to the screw portion 35 a at the tip of the drive shaft 35. Furthermore, even if the screw portion 7a formed on the inner periphery of the shaft portion 7A of the handle 7 is to be screwed into the screw portion 6a of the fixed holder 6, the upper wall of the bag-like portion 7C of the handle 7 is attached to the floating nut 4. The screw portion 7 a of the handle 7 does not screw into the screw portion 6 a of the fixed holder 6. For this reason, even if the handle 7 is rotated in this state, the handle 7 is only rotated and does not screw into the threaded portion 6a of the fixed holder 6, thereby allowing the user to notice that the nut 4 has been forgotten to be tightened. .

  Here, in order to obtain the above effect, as shown in FIG. 5, the height H1 from the start position of the threaded portion 2c of the rotor body 2 to the upper end surface of the nut 4 when the nut 4 is not tightened is determined by the handle 7 The height from the lower end surface to the inner end surface of the bag-like portion 7C must be equal to or higher than H2 (H1 ≧ H2). That is, if the relationship of H1 ≧ H2 is established, the handle 7 cannot be screwed into the threaded portion 6a of the fixed holder 6 without the nut 4 being tightened.

  Thus, when the user notices that the nut 4 has been forgotten to be tightened, the nut 4 is securely tightened to the screw portion 35a of the drive shaft 35 to fasten the rotor body 2 to the drive shaft 35, and then the cover with the handle 7 is attached. 3 is attached to the rotor body 2, the nut 4 and the upper wall of the bag-like portion 7C of the handle 7 do not interfere with each other, so the screw portion 7a of the handle 7 is screwed into the screw portion 6a of the fixing holder 6. If the handle 7B is gripped and the handle 7 is turned to fasten the screw portion 7a of the shaft portion 7A to the screw portion 6a of the fixed holder 6, the cover 3 is securely attached to the rotor body 2 by the handle 7 as shown in FIG. Can be concluded.

  By the way, in this embodiment, since the through hole 7c is formed in the center of the upper wall of the bag-like portion 7C of the handle 7, when the cover 3 is attached by the handle 7 in a state where the nut 4 is incompletely tightened. Without removing the cover 3, a tool (not shown) such as a hexagon wrench is inserted into the handle 7 from the through hole 7c, the tip of the tool is fitted into the hexagon hole 4a of the nut 4, and the nut 4 is tightened by turning the tool. Convenient to be able to. Here, as described above, the inner diameter φD1 of the through hole 7c is set to be smaller than the outer diameter φD2 of the nut 4 (φD1 <φD2). Therefore, the nut 4 does not pass through the through hole 7c, and the nut 4 If the nut 4 is forgotten to be tightened, the nut 4 can be surely brought into contact with the bag-like portion 7C of the handle 7 so that the user can recognize that the nut 4 has been forgotten to be tightened.

  As described above, according to the present invention, the bag 7 is formed on the handle 7, and the nut 4 is in contact with the bag 7 C of the handle 7 when the nut 4 is not fastened to the drive shaft 35. Since the handle 7 is prevented from being screwed into the fixed holder 6, the handle 7 cannot be tightened even if the handle 7 is rotated in order to attach the cover 3 to the rotor body 2. It is possible to notify that the nut 4 has been forgotten to be tightened. Accordingly, the cover 3 cannot be attached unless the nut 4 is securely tightened and the rotor body 2 is completely fastened to the drive shaft 35. The user handles the handle after fastening the rotor body 2 to the drive shaft 35 with the nut 4. The cover 3 is attached to the rotor body 2 by turning 7, and the rotor 1 to which the cover 3 is attached can be rotationally driven to perform the desired centrifugal separation. For this reason, it is possible to prevent the occurrence of a problem that the rotor 1 is rotationally driven without forgetting to tighten the nut 4 and the rotor 1 is not fastened to the drive shaft 35, and the drive torque is reliably transmitted from the drive shaft 35 to the rotor 1. The rotor 1 can be transmitted and rotated at a predetermined speed, and desired centrifugal separation can be performed stably, and abnormal vibration of the rotor 1 can be reliably prevented.

It is a fracture side view of the centrifuge concerning the present invention. 1 is a front sectional view of a centrifuge rotor according to the present invention. FIG. 3 is an enlarged detail view of a part A in FIG. 2 (a state in which the nut is normally tightened). FIG. 3 is an enlarged detail view of a portion A in FIG. 2 (a state where the nut is forgotten to be tightened). It is a decomposition | disassembly partial sectional view of the rotor for centrifuges which concerns on this invention. It is a fragmentary sectional view which shows the conventional example of the fastening structure of a rotor.

DESCRIPTION OF SYMBOLS 1 Rotor 2 Rotor body 2A Rotor body boss part 2a Rotor body coupling part 2b Rotor body specimen holding part 2c Rotor body screw part 3 Cover 3a Cover through-hole 4 Nut (fastening member)
4a Hexagonal hole of nut 5 Belleville spring 6 Fixed holder 6a Screw portion of fixed holder 7 Handle 7A Handle shaft portion 7B Handle grip portion 7C Handle bag-like portion 7a Handle screw portion 7b Handle fitting hole 7c Handle penetration Hole 8, 9 Elastic seal ring 10 Retaining ring 30 Centrifuge 31 Motor 32 Rotor chamber 33 Motor support part 34 Frame 35 Drive shaft 35a Screw part of drive shaft 36 Door φD1 Inner diameter of handle through hole φD2 Nut outer diameter H1 Rotor Height from the start position of the threaded portion of the body to the upper end surface of the fastening member H2 Height from the lower end surface of the handle to the inner end surface of the bag-like portion N Center axis

Claims (3)

A rotor body that accommodates and rotates a sample, a fastening member for fastening the rotor body to a drive shaft, a handle attached to the rotor body, and a cover detachably attached to the rotor body by the handle In the centrifuge rotor,
A state in which a bag- like portion is formed on the handle, a through hole having an inner diameter smaller than the outer diameter of the fastening member is provided on an upper wall of the bag-like portion of the handle , and the fastening member is not fastened to the drive shaft Then, the centrifuge rotor is characterized in that the fastening member abuts against the bag-like portion of the handle to prevent the handle from being screwed into the rotor body. A rotor body that accommodates and rotates a sample, a fastening member for fastening the rotor body to a drive shaft, a handle attached to the rotor body, and a cover detachably attached to the rotor body by the handle In the centrifuge rotor,
A state in which a bag-like portion is formed on the handle, a through hole having an inner diameter smaller than the outer diameter of the fastening member is provided on an upper wall of the bag-like portion of the handle, and the fastening member is not fastened to the drive shaft Then, the height H1 from the starting position of the screw portion of the rotor body to the upper end surface of the fastening member is set to be equal to or higher than the height H2 from the lower end surface of the handle to the inner end surface of the bag-like portion, and the fastening member is not tightened. In the state, the fastening member is in contact with the bag-like portion of the handle to prevent the handle from being screwed into the rotor body. Centrifuge, characterized in that it comprises a centrifuge rotor according to any one of claims 1-2.

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