JP2509704Y2 - Angle rotor for centrifuge - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to reduction of the moment of inertia of the rotor of a centrifuge.

[0002]

2. Description of the Related Art In a conventional centrifuge rotor, 1
For an angle rotor used at about 5000 rpm,
Cutting is generally performed from a block such as an aluminum alloy, such as the rotor shown in A (Fig. 2 of JP-B-56-16204) and the rotor shown in Fig. 5B (Fig. 2 of JP-B-57-40112). A sample tube hole for inserting a sample tube at a certain angle, for example, 45 degrees, with respect to the axis of rotation is provided.

A tube containing a sample, which is generally called a microtube, is held at the open end of a tube insertion hole of a rotor. There are two ways to hold the sample tube. One is to support the tube at the bottom of the rotor tube hole and the other is to hook the tube lip on the open end of the rotor hole. There is. In the latter case, there are cases where the tube is directly hooked and cases where an adapter with a collar is made to accommodate the tube therein.

By the way, recently, it has been used for research on DNA, RNA and the like, and in order to centrifuge a large number of samples, it has been demanded to accelerate and decelerate the centrifuge in a short time.

[0005]

In order to meet this demand, it is necessary to strengthen the motor of the centrifuge or reduce the moment of inertia of the rotor, which is the load of the motor. As one of means for solving this problem, as shown in FIG.
A press-molded rotor as shown in FIG. 1 of 8264) has been devised. Since the plate is press-molded, the moment of inertia is extremely small. However, an expensive press die is required to manufacture this rotor. Also, when the user wants to change the tube size or increase the number of tubes that can be processed in one centrifugation operation, the size of the rotor cannot be changed easily and a new mold There is a drawback that must be produced.

Therefore, there has been a demand for an angle rotor having a small moment of inertia, in which the tube size and the number of tubes can be easily changed and the manufacturing cost is relatively low. In addition, the development of a rotor with a small moment of inertia leads to a reduction in motor power, which is an issue that must be pursued to reduce the cost of the entire centrifuge and reduce energy consumption. ing.

[0007]

According to the present invention, the portion left between the holes for inserting the sample tubes of the angle rotor manufactured by conventional cutting is a useless portion, and this portion is the moment of inertia. Since it is the cause of increasing the
We devised a method in which the space where the tube was inserted was scraped off by cutting and the sample tube was held by a plate-shaped tube holding plate. There are cases where a plurality of tube holes having the same size are provided in one tube holding plate, and cases where a plurality of tube holes having a plurality of sizes are provided respectively.

[0008]

FIG. 1 shows an embodiment of the present invention. The angle rotor 60 mainly includes a rotor body 61, a tube holding plate 62, and a rotor lid 63. For the sake of clarity, the rotor body 61 and the tube holding plate 62 are shown individually in FIGS. 2 and 3.

The rotor body 61 is manufactured by cutting from a block of aluminum alloy or the like, as is conventional.
In the rotor body 61, a center hole 65 for inserting the rotary shaft of the centrifuge is formed in the bottom surface thereof, and a serrated recess 64 is formed in the top surface of the rotor body 61 coaxially with the center hole 65.
On the tapered inner peripheral surface 66 of the recess 64, at a substantially right angle,
The tube storage groove 67 is formed in a ring shape along a circumference concentric with the central hole 65.

The tube holding plate 62 is made by subjecting a metal plate of aluminum, stainless steel or the like to spatulation or press molding, or molding a synthetic resin material, and has a circular bottom surface located in the center of the recess 64 of the rotor body. 68 and a circular disk part 71 that contacts the inner peripheral surface 66 surrounding the circular bottom surface 68, respectively, and a ring-shaped tapered flange part 72 around the disk part, and the tapered flange part 72 has a sample tube. A plurality of tube holes 73 for inserting and holding the (microtube) 92 are formed along the circumferential direction. Several types of tube holding plates 62 are prepared depending on the size of the sample tube and the number of accommodated tubes, and the user selects one of them and fixes it on the recess 64 of the rotor body with the pressing ring 74.

A ring-shaped press fitting 75 is attached concentrically to the center of the circular bottom surface 68 of the recess with a bolt 76. The screw on the outer peripheral surface of the press fitting 75 is attached to the screw on the inner peripheral surface of the press ring 74. The tube holding plate 62 is screwed together.
Can be pressed and fixed to the bottom surface 68 of the recess. A ring-shaped groove is coaxially formed on the bottom surface of the pressing ring 74, and an O-ring 80 is attached to the groove.

The tube holding plate 62 has a pressing metal fitting 75.
A central hole 77 that engages with the outer peripheral surface of the center hole 77, and two small holes 78 are formed facing each other relatively near the periphery of the central hole 77. The small hole 78 is the pin 7 planted on the bottom surface 68 of the recess.
9 to prevent the tube holding plate 62 from rotating.
A rotor stop bolt 81 for fixing the rotor body 61 to the motor shaft fitted in the center hole 65 is attached to the upper portion of the shaft center of the rotor body 61. The rotor lid 63 is attached to the rotor main body 61 by being screwed into a screw on the inner peripheral surface of the pressing metal fitting 75 at the center, if necessary.

The tube holding plate 62 of FIG. 3 has tube holes 73 of the same size, but as shown in FIG. 4, for example, a tube hole 73a for 1.5 ml,
You may provide the tube hole of several types, such as the tube hole 73b for 0.5 ml, and the tube hole 73c for 0.4 ml. In this case, the number of holes for each size is small, but even if the tube size changes, it is not necessary to change the tube holding plate, which is convenient when the number of tubes used is small.

[0014]

EFFECTS OF THE INVENTION According to the present invention, (1) since a wasteful portion between the tube insertion holes of the conventional rotor is scraped off, the strength of the high speed rotor is maintained and the moment of inertia is small. An angle rotor can be realized.

(2) The manufacturing cost is relatively low because it is manufactured by cutting without using an expensive mold such as press molding, and there is the flexibility to easily manufacture rotors of different sizes. is there. (3) In the conventional angle rotor, when the size of the sample tube changed, it had to be replaced with another rotor that matched the size of the tube.
In the rotor of the present invention, it is only necessary to replace the tube holding plate 62, so that the tube holding plate is easy to handle and easy to use, and the tube holding plate can be easily manufactured by press molding or spatula forming, so that the manufacturing cost is low. Therefore, even if the user prepares many kinds of tube holding plates, the economical burden is negligible.

(4) Another advantage of the present invention is that when a conventional angle rotor is used, if there is a portion where the tube is not inserted in the tube hole of the rotor, the hole will be a whistle when rotating at high speed. May cause an unpleasant whistle noise, such as puncturing the bottom of the sample tube hole, or covering the rotor with a lid to prevent the opening from coming into contact with the fast airflow due to high speed rotation. I had to take measures.

According to the method of the present invention, even if there is a portion where the sample is not inserted, there is no hole to be an air column, so that no whistle noise is generated. Therefore, it can be used without using the rotor lid. Being able to use it without tightening this lid means
It is an important task for the user, and it is a tedious operation that the lid of the rotor must be tightened and removed to prevent noise, and an experiment in which a large number of samples are being studied for DNA, RNA, etc. This will hinder the rapid experimentation.

(5) When a plurality of tube holes of different sizes are provided in one tube holding plate, it is not necessary to change the tube holding plate even if the tube size changes. This is convenient when the number of tubes used is small.

[Brief description of drawings]

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

2 is a cross-sectional view of a rotor body 61 shown in FIG.

3 is a plan view and a cross-sectional view of the tube holding plate 62 of FIG.

FIG. 4 is a plan view and a sectional view showing a modified embodiment of the tube holding plate of the present invention.

FIG. 5 is a cross-sectional view of an angle rotor manufactured by conventional cutting processing.

FIG. 6 is a cross-sectional view of an angle rotor manufactured by conventional press molding.

Claims (2)

(57) [Scope of utility model registration request] 1. An angle rotor for a centrifuge, in which a tube holding plate is attached to a rotor body, wherein the rotor body is made by cutting a metal block, and the bottom surface thereof has a rotating shaft of the centrifuge. A center hole for inserting the tube is formed, and a recessed portion having a serpentine shape is formed on the upper surface thereof coaxially with the center hole, and a tube accommodating groove is formed at a substantially right angle on the tapered inner peripheral surface of the recess. The tube holding plate is formed in a ring shape along a circumference concentric with the central hole, and the tube holding plate is opposed to a circular bottom surface located in the center of the recess and an inner circumferential surface surrounding the circular bottom surface, respectively. It has a disc part that touches it and a ring-shaped tapered collar part around the disc part, and a plurality of holes of equal size for inserting and holding the sample tube in the tapered collar part are arranged along the circumferential direction. Is formed by Characterized Rukoto, centrifuge angle rotor. 2. An angle rotor for a centrifuge, which is used by attaching a tube holding plate to a rotor body, wherein the rotor body is made by cutting a metal block, and the bottom surface thereof has a rotating shaft of the centrifuge. A central hole for inserting the central hole is formed, and a recessed portion having a serpentine shape is formed coaxially with the central hole on the upper surface thereof. The tube holding plate is formed in a ring shape along a circumference concentric with the central hole, and the tube holding plate is in contact with a circular bottom surface located in the center of the recess and an inner circumferential surface surrounding the circular bottom surface, respectively. It has a disk part and a ring-shaped tapered flange part around the disk part, and the tapered flange part has a plurality of holes of multiple sizes for inserting and holding the sample tube in the circumferential direction. Formed along Characterized in that it is a shall, centrifuge angle rotor.