JPH1034018A - Angle rotor for centrifuge - Google Patents

Abstract

(57) [PROBLEMS] To prevent breakage of a sample tube due to centrifugal force while maintaining the conventional advantages of low production cost and small inertia samen. The rotor includes a rotor main body, a rotor lid, and a bottom plate. The rotor body 50 is made by cutting a metal block,
And a cover portion 54 with a tapered flange 53 having a tube hole 55. The tube inserted into the tube hole is housed in a donut-shaped space 56 surrounded by the tapered flange 53, the cover 54, and the bottom plate 70. Particularly in the present invention, the thickness D of the tapered flange 53 around the tube hole is substantially equal to or slightly larger than the length L of the opening-side cylindrical portion 80a having a substantially constant outer diameter of the tube 80. Selected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an angle rotor for a centrifuge having a relatively low manufacturing cost and a small moment of inertia, and more particularly to a technique for preventing a sample tube from being damaged by centrifugal force during rotation of the rotor.

[0002]

2. Description of the Related Art In recent studies on DNA, RNA, etc.,
In order to centrifuge a large number of samples, it is required to shorten the centrifugation time per time. In order to meet the demand, it is necessary to shorten the acceleration time and the deceleration time of the centrifuge, and therefore, there is a strong demand for reducing the moment of inertia of the rotor.

[0003] Then, Japanese Patent Publication No. 2-3826 was proposed.
4 is a rotor manufactured using the press molding technique. Although the rotor can be formed by press forming the plate, the moment of inertia can be significantly reduced. However, an expensive press die is required for manufacturing, and the manufacturing cost is disadvantageously increased. An angle rotor that solves this drawback, reduces the manufacturing cost by eliminating the need for expensive press dies, and reduces the moment of inertia has been proposed by the same inventor as in the present invention.
55167 "Angle rotor and tube holding plate for centrifuge". The proposed device is the basic technology of the present invention, and will be described with reference to the specification.

The angle rotor 100 comprises a rotor body 50, a rotor lid 60, and a bottom plate 70 as shown in FIG. The rotor body 50 is made by cutting a metal block such as an aluminum alloy, and has a rotating shaft portion 52 having a center hole 51 for inserting a motor shaft on a bottom surface;
The tapered flange 53 is formed of a thin slash and is integrally formed on the peripheral surface of the rotating shaft 52, and a cover 54 extending integrally from the tip of the tapered flange 53 and surrounding the outer periphery of the rotor. The cover portion 54 forms a windshield, and is left uncut concentrically with the rotating shaft portion 52 with a thickness strong enough to withstand the centrifugal force. The extended end (lower end) of the cover portion 54 is engaged with the peripheral edge of the bottom plate 70 to form the outer peripheral surface of the rotor without smooth projections. At a right angle to the tapered surface of the tapered flange 53,
A plurality of tube holes 55 having the same size are formed so as to penetrate in the circumferential direction at an inclination of approximately 45 ° with respect to the rotation axis.

[0005] The bent portion of the cover portion 54 near the extended end facing the tube hole 55 is used to increase the strength and to collect liquid at the bottom of the rotor when the sample tube 80 is punctured so that the sample does not scatter. make. The rotor lid 60 is formed in a substantially thin disk shape, and a knob 61 is attached to the center thereof.

The bottom plate 70 is made of a thin plate of metal or synthetic resin in a ring shape, and is attached to the bottom surface of the tapered flange 53 with bolts 71 to close the bottom surface of the rotor body 50. An outer peripheral edge of the bottom plate 70 is engaged with an extended end of the cover portion 54. FIG. 4 is a sectional view of the bottom plate. In the illustrated example, the bottom plate 7
Reference numeral 0 denotes a shape in which a circular dish is turned upside down, and a center hole 72 larger than the outer shape of the rotating shaft portion 52 is formed at the axis thereof. Are provided with a plurality of mounting holes 73.

A donut-shaped space 56 concentric with the rotary shaft 52 is formed by being surrounded by the tapered flange 53, the cover 54, and the bottom plate 70, and the tube hole 5 is formed in the space.
The sample tube 80 inserted in 5 is stored. A rotor stop bolt 89 is mounted on the shaft center on the upper surface of the rotating shaft portion 52. The rotor main body 50 is attached to the motor shaft inserted into the center hole 51 by the rotor fixing bolt 89. A cylindrical holding member 90 is attached to the upper surface of the rotating shaft portion 52 by a bolt 92 around the head of the rotor stop bolt 89.

The rotor lid 60 is attached to the rotor main body 50 by screwing it to a screw on the inner peripheral surface of the holding member 90 as necessary. The angle rotor shown in FIG. 3 has a large weight because a useless portion between the holes of the rotor is cut away to form a donut-shaped space 56, and the moment of inertia is reduced while maintaining the strength as a high-speed rotor. There is an advantage that it is small and the windage is small. In addition, there is an advantage that the rotor can be manufactured inexpensively by cutting without using an expensive mold as in the case of forming an angle rotor by press molding, and rotors of different sizes can be easily manufactured.

[0009]

In the angle rotor of FIG. 3, as shown in FIGS. 5 and 6, the cylindrical portion (opening portion having a constant outer diameter) 80a of the sample tube 80 is rotated during high-speed rotation. The portion protruding from the tube hole 55 into the donut-shaped space 56 may be deformed into an elliptical shape by the centrifugal force (see FIG. 6) and may be bent in the direction of the centrifugal force (see FIG. 5) to be damaged.

[0010] An object of the present invention is to make the manufacturing cost low.
Another object of the present invention is to prevent the sample tube from being deformed and damaged by centrifugal force while maintaining the conventional advantage that the moment of inertia is small.

[0011]

SUMMARY OF THE INVENTION An angle rotor for a centrifuge according to the present invention comprises a rotor body, a rotor lid, and a bottom plate. The rotor body is made by cutting a metal block, and has a rotating shaft portion having a central hole for inserting a motor shaft on the bottom surface, and a horn-shaped tapered flange integrally projecting from a peripheral surface of the rotating shaft portion. Portion, a cover portion extending integrally with the protruding end of the tapered flange portion, and having a cover portion surrounding the outer periphery of the rotor. A plurality of tube holes having the same size are formed substantially at right angles to the tapered surface of the tapered flange portion. Penetration is formed along the circumferential direction.

The bottom plate is formed of a ring-shaped thin plate attached so as to close the bottom side of the rotor body. The rotor lid is attached so as to cover the upper surface of the rotor body. A donut-shaped space concentric with the rotating shaft is formed by being surrounded by the tapered flange, the cover, and the bottom plate, and the sample tube inserted into the tube hole is stored in the space.

In the present invention, in particular, the thickness (D) of the tapered flange portion around the tube hole is substantially equal to the length (L) of the cylindrical portion on the opening side having a substantially constant outer diameter of the sample tube. Or it is selected slightly larger.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. In these drawings, parts corresponding to those in FIG. 3 are denoted by the same reference numerals, and redundant description will be omitted. In the present invention, in order to prevent the cylindrical portion 80a of the sample tube 80 from being deformed into an elliptical shape due to centrifugal force, the thickness D of the tapered flange portion 53 around the tube hole 55 is changed to the cylindrical portion of the sample tube 80. (Part on the opening side having a substantially constant outer diameter) The length L is selected to be substantially equal to or slightly larger than the length L of 80a.

In this case, even if the cylindrical portion 80a is deformed into an elliptical shape by the centrifugal force, the tube hole 5a is not deformed.
5 is not deformed because it is suppressed by the inner peripheral surface. The cylindrical part 80
Since the deformation of a is suppressed, the sample tube 80 is not bent in the centrifugal direction. As described above, in the present invention, the sample tube is prevented from being deformed by the centrifugal force, thereby preventing the sample tube from being damaged.

[0016]

【The invention's effect】

(1) As described above, in the present invention, the tube hole 55
Is selected to be approximately equal to or greater than the length L of the cylindrical portion 80a of the sample tube 80, so that the sample tube 80 can receive the cylindrical shape even when subjected to centrifugal force. Since the portion 80a is held down on the inner peripheral surface of the tube hole 55, it is not deformed, and therefore there is no risk of being damaged.

(2) In the angle rotor according to the present invention, since a useless portion between the holes of the rotor is cut off to form a donut-shaped space 56, the inertia moment is maintained while maintaining the strength as a high-speed rotor. The advantage of the conventional rotor that it is small and the windage is small can be maintained. (3) The angle rotor according to the present invention can be manufactured inexpensively by cutting without using an expensive mold as in the case of manufacturing an angle rotor by press molding, and can easily manufacture rotors of different sizes. That is, the advantages of the conventional rotor can be maintained.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of the rotor main body 50 of FIG.

FIG. 3 is a longitudinal sectional view of a conventional angle rotor.

FIG. 4 is a vertical sectional view of a bottom plate 70 of FIG. 3;

FIG. 5 is a longitudinal sectional view of a conventional angle rotor for explaining deformation of a sample tube 80 due to centrifugal force.

FIG. 6 is a sectional view taken along the line aa ′ of FIG. 5;

Claims (1)

[Claims] 1. A rotary shaft portion formed by cutting a metal block and having a central hole for inserting a motor shaft on a bottom surface, and a horn-shaped taper integrally projecting from a peripheral surface of the rotary shaft portion. A plurality of tube holes having a flange portion and a cover portion extending integrally with a tip end of the tapered flange portion and surrounding the outer periphery of the rotor, and having a size substantially perpendicular to a tapered surface of the tapered flange portion; A rotor body, which is formed so as to penetrate along the circumferential direction, a bottom plate made of a ring-shaped thin plate which is attached so as to close the bottom side of the rotor body, and a rotor lid which is attached so as to close the upper surface of the rotor body. A donut-shaped space formed by the tapered flange, the cover, and the bottom plate and concentric with the rotary shaft; and a sample tube inserted into the tube hole in the space. The thickness (D) of the tapered flange around the tube hole is equal to the length of the cylindrical portion on the open side of the sample tube having a substantially constant outer diameter. An angle rotor for a centrifuge, wherein the angle rotor is selected to be substantially equal to or slightly larger than the length (L).