JP4582842B2 - Centrifuge rotor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a centrifuge rotor , and more particularly to a rotor structure.
[0002]
[Prior art]
In the conventional centrifuge 50 shown in FIG. 3, the motor 51 is installed on the flange 52 a formed inside the housing 52 via the elastic body 53. The rotor 54 is detachably engaged with the drive shaft 51a of the motor 51. As shown in FIG. 3, the rotor 54 used in the centrifuge includes one in which tube insertion holes 55 a are formed radially and inclined at the periphery of the upper surface of a disk-shaped rotor main body 55.
[0003]
[Problems to be solved by the invention]
By the way, the rotor 54 is formed by cutting an aluminum block into a disk shape and then forming a tube (test tube) insertion hole 55a. Therefore, processing is complicated and the cost is high. In addition, the thickness of the portion for forming the tube insertion hole 55a in the rotor 54 is required, the weight is increased, and the capacity of the motor 1 is also required. In order to reduce the weight, the center portion of the rotor 54 (the portion attached to the drive shaft 51a of the motor 51) and the portion for forming the tube insertion hole 55a in FIG. The shape of the rotor 54 becomes complicated, and the processing becomes complicated accordingly. Further, in order to correspond to other types of tubes, it is necessary to prepare each of the rotors 54 having the tube insertion holes 55a corresponding to the other tubes, which increases the cost.
[0004]
Accordingly, an object of the present invention is to provide a centrifuge rotor that can be easily processed and reduced in weight, and can be easily and inexpensively adapted to the type of tube.
[0005]
[Means for Solving the Problems]
In the rotor for a centrifuge according to claim 1 of the present invention, a bottomed cylindrical rotor main body with a boss standing at the center, a disk integrally fitted to the boss of the rotor main body, and the disk A plurality of racks mounted on the periphery of each of the racks, each rack having a groove on an inner peripheral surface thereof, the groove being fitted to the periphery of the disk, and the rack and the disk by fitted a pin slot formed in the fitting portion, the disc periphery said movably mounted in the radial direction of the rotor body of the time of rotating the rotor body, the rotor body The racks are placed in pressure contact with the inner peripheral surface of the rotor body by the centrifugal force accompanying the rotation of the rotor.
[0006]
According to the centrifuge rotor of the present invention, since the rack is received by the inner peripheral surface of the rotor body, the rotor body may have a simple structure with a bottomed cylindrical shape, and therefore the weight of the rotor can be reduced and the cost can be reduced. .
[0008]
In the centrifuge rotor of the present invention, the rack is fitted to the periphery of the disk, and then the disk is fitted to the center of the rotor body. In this state, when the rotor body is driven to rotate, the rack is moved radially outward by centrifugal force and is received by being brought into contact with the inner peripheral surface of the rotor body.
In other words, in the centrifuge rotor of the present invention, the disk only needs to position the rack, and does not need to be strong enough to hold the rack. The rack is received by the inner peripheral surface of the rotor body by centrifugal force generated by rotationally driving the rotor body. Therefore, it is only necessary to sufficiently maintain the strength of the rotor body, and the rotor can be reduced in weight.
Also, in the centrifugation operation, it is only necessary to load the tube in a rack at another location in advance, and to mount the disk on which the rack is mounted to the rotor body. .
[0009]
According to a second aspect of the rotor for a centrifugal separator of the present invention, in the first aspect, a spline extending in the vertical direction is formed on an outer peripheral surface of a boss standing at the center of the rotor body, and the spline is formed at the center of the disc. forming a hole, and so as to fit the disc into the boss by dropping the spline hole of the disc to the spline of the boss.
[0010]
In the rotor for a centrifuge according to the present invention, the disk can be fitted to the rotor body by dropping the center of the disk into a boss erected at the center of the rotor body, so that the mounting operation is extremely good.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows an embodiment of a rotor according to the present invention, and is an exploded perspective view showing a main part of a centrifuge provided with the rotor, and FIG. 2 shows a state in which the rotor is assembled. FIG. The other parts (not shown) of the centrifuge are the same as the conventional ones.
[0014]
The rotor 10 of this centrifuge is composed of a rotor body 11, a disk 12, a rack 13, and the like.
[0015]
The rotor body 11 has a bottomed cylindrical shape and includes a boss 14 that protrudes inwardly in the center. A spline 15 parallel to the axial center is formed on the peripheral surface of the boss 14. Further, as shown in FIG. 2, the boss 14 has a hole 16 having an opening in the bottom wall 11 a of the rotor body 11, and a hexagonal recess 17 is formed in the opening of the hole 16. Yes. The boss 14 is formed with a bolt insertion hole 18 that penetrates the hole 16 to the upper surface.
On the other hand, the motor drive shaft 19 is formed with a hexagonal convex portion 20 on the periphery, and a female screw hole 21 is formed on the tip surface.
Then, when the hole 16 of the rotor body 11 is fitted to the motor drive shaft 19, the concave portion 17 is fitted to the convex portion 20 of the motor drive shaft 19. Was then inserting bolts 22 from the bolt insertion hole 18 of the rotor body 11, it is screwed to the distal end to the female screw hole 21 of the motor drive shaft 19, to fasten the rotor body 11 to the motor drive shaft 19. Therefore, the rotor body 11 is restrained in the rotational direction with respect to the motor drive shaft 19 by the engagement between the recess 17 and the protrusion 20 of the motor drive shaft 19.
[0016]
The disc 12 has a spline hole 23 corresponding to the spline 15 of the boss 14 at the center, and four sets of holes 24 at the periphery. Two holes 24 in each group are formed within a range of ¼ circle (center 45 °), and they are long holes and are formed in parallel to each other.
The disc 12 is constrained in the rotational direction with respect to the rotor body 11 by fitting the spline hole 23 to the spline 15 of the boss 14 of the rotor body 11.
[0017]
The rack 13 is formed in a shape obtained by cutting an annular donut shape into approximately 1/4. An annular groove 25 that opens to the inner peripheral surface is formed on the inner peripheral surface of the arc-shaped rack 13. The upper and lower tongue pieces 26 and 27 that define the annular groove 25 are formed with two holes 28 that pass through them. These holes 28 are formed at positions corresponding to the holes 24 of the disk 12.
The rack 13 has an inclined surface 29 formed inwardly on the upper surface, and six tube receiving holes 30 are formed in the inclined surface 29.
The rack 13 is fitted with the groove 25 on the periphery of the disk 12, the hole 28 of the rack 13 is matched with the hole 24 of the disk 12, and the spring pin 31 is inserted into the holes 28, 24. By holding it, it is hold | maintained at the disc 12. In this way, the rack 13 held by the disk 12 can move in the radial direction of the disk 12 because the hole 24 of the disk 12 is formed as a long hole.
[0018]
In the centrifuge configured as described above, the groove 25 of the rack 13 is fitted and attached to the peripheral edge of the disc 12, and the spring pin 31 is inserted into the holes 28 and 24 of the rack 13 and the disc 12 so that the rack 13 is held at the periphery of the disk 12, and the rack A is loaded with the tube A, and then the spline hole 23 of the disk 12 is fitted into the spline 15 of the boss 14 of the rotor body 11 as shown in FIG. Put on.
In this state, when the rotor body 11 is rotationally driven and a centrifugal force acts on the rack 13, the spring pin 31 of the rack 13 moves radially outward along the long hole 24 of the disk 12, thereby the rack 13. Is received in contact with the inner peripheral surface of the rotor body 11.
In other words, in the centrifuge of the present invention, the disc 12 only needs to position the rack 13 and does not need to be strong enough to hold the rack 13. Therefore, the rotor 10 can be reduced in weight.
[0019]
In the above embodiment, the rack 13 is attached to the disk 12 by the spring pin 31. However, for example, a female screw is formed in the hole 28 of the tongue piece 27 of the rack 13, and a screw is used instead of the spring pin 31. The screw may be inserted into the hole 28 of the tongue piece 26 of the rack 13 and the hole 24 of the disc 12 so that the tip is screwed into the hole 28 of the tongue piece 27. Radius is placed along the inner peripheral surface of the main body 11 and restrained in the circumferential direction with respect to the rotor main body 11 so that the rack 13 abuts against the inner peripheral surface of the rotor main body 11 when centrifugal force is applied. What is necessary is just to be arrange | positioned so that it can move to a direction outward.
[0020]
Moreover, in the said embodiment, although the disc 12 was used and it connected with the periphery of this disc 12, and comprised the cyclic | annular rack assembly, the side surface of the rack 13 is employ | adopted without employ | adopting the disc 12. They may be connected to each other and assembled in an annular shape, and positioned along the inner peripheral surface of the rotor body 11. In that case, it is preferable that each rack 13 can be independently moved radially outward so as to contact the inner peripheral surface of the rotor body 11, and the rack 13 can be moved to the rotor by means such as a stopper. It is preferable to restrain the main body 11 in the circumferential direction.
[0021]
【The invention's effect】
As described above, in the rotor for a centrifugal separator according to the first aspect of the present invention, the bottomed cylindrical rotor body having a boss standing at the center thereof, and the disc that is integrally fitted to the boss of the rotor body. And a plurality of racks mounted on the periphery of the disk, each rack having a groove on the inner peripheral surface thereof, the groove being fitted to the periphery of the disk, and the rack and by causing fitted a pin slot formed in the fitting portion of the disc, the disc periphery said movably mounted in the radial direction of the rotor body of, time of rotating the rotor body In addition, the racks are placed in pressure contact with the inner peripheral surface of the rotor body by a centrifugal force accompanying the rotation of the rotor body.
Therefore, according to the centrifuge rotor of the present invention, since the rack is received by the inner peripheral surface of the rotor body, the rotor body may have a simple bottomed cylindrical structure, and thus the rotor can be reduced in weight and inexpensive. become. In addition, when the tube is loaded into the rotor, the tube can be loaded in the rack in advance, and the rack can be accommodated in the rotor main body, and only the lightweight rack needs to be moved. In addition, since the tubes can be loaded into the rack in a separate operation, the work efficiency can be improved.
[0022]
In the centrifuge rotor according to the first aspect of the present invention, the disk only needs to position the rack, and does not need to be strong enough to hold the rack. Since the rack is received by the inner peripheral surface of the rotor body by the centrifugal force generated by rotationally driving the rotor body, the rotor body only needs to have sufficient strength, and the weight of the rotor can be reduced. Also, in the centrifugal separation work, it is only necessary to load the tube in a rack at another location in advance and attach the disk on which the rack is attached to the rotor body, which makes the work extremely easy.
[0023]
According to a centrifuge rotor of a second aspect of the present invention, in the first aspect, a spline extending in the vertical direction is formed on an outer peripheral surface of a boss provided upright at the center of the rotor body, and the center of the disc is formed. and so as to fit the disc into the boss by the forming the spline hole, dropping the spline hole of the disc to the spline of the boss.
Therefore, in the centrifuge rotor of the present invention, the work of mounting the rack on the rotor body is extremely good.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view showing an embodiment of a centrifuge provided with a rotor according to the present invention.
FIG. 2 is a cross-sectional view showing a state where the rotor in FIG. 1 is assembled.
FIG. 3 is a conceptual cross-sectional view showing a centrifuge provided with a conventional rotor.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Rotor 11 Rotor main body 12 Disk 13 Rack 14 Boss 15 Spline 16 Hole 17 Recess 18 Bolt insertion hole 19 Motor drive shaft 20 Protrusion 21 Female screw hole 22 Bolt 23 Spline hole 24 Hole 25 Groove 26, 27 Tongue piece 28 Hole 29 Slope 30 Tube receiving hole 31 Spring pin A Tube

Claims (2)

A bottomed cylindrical rotor main body with a boss standing at the center, a disk fitted integrally with the boss of the rotor main body, and a plurality of racks mounted on the periphery of the disk ; Each rack has a groove on its inner peripheral surface, and the groove is fitted to the peripheral edge of the disk, and a pin is inserted into a long hole formed in the fitting part of the rack and the disk. by the movably mounted in the radial direction of the rotor body to the periphery of the disc, when rotating the rotor body, by the centrifugal force caused by the rotation of the rotor body, each of said rack said rotor A centrifuge rotor characterized in that it is placed in pressure contact with an inner peripheral surface of a main body. A spline extending in the vertical direction is formed on the outer peripheral surface of the boss erected at the center of the rotor body, a spline hole is formed at the center of the disc, and the spline hole of the disc is dropped into the spline of the boss. The centrifuge rotor according to claim 1, wherein the disc is fitted to the boss .

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