JPH02131155A - Rotor for centrifuge separator - Google Patents

Abstract

PURPOSE:To obtain the title rotor with little windage loss and inertial moment by constituting a motor shaft insertion part and container holding parts in an integrated block form, forming a holding hole for a sample container in the container holding part, and providing a conical table-shaped cover and a bottom cover. CONSTITUTION:A motor shaft insertion part 21 and a container holding part 23 are formed into a single block 24. a center hole 22 in which the motor shaft is inserted is formed in the motor shaft insertion part 2, and a holding hole 26 in which a sample container is inserted is formed in each container holding part 23. In addition, a conical table-shaped cover 27 is placed on the block 24 and is fixed to the upper surface of the block 24 with a screw 28. Furthermore, the bottom surface of the cover 27 is fixed to the bottom surface of the black 24 using a clamping bolt 31 with a bottom lid 29 in place on the bottom surface. The protruding part of the sample container 25 on the upper surface of the cover 27 is covered with a rotor lid 32, and a knob 33 is attached to the lid 32. Under this design, the windage loss and inertial moment of the rotor are minimized and a compact drive motor can be used.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a rotor for a centrifuge of the angle rotor type.

``Prior art'' In order to obtain a large centrifugal force in a centrifugal separator f2, the rotor must rotate at high speed (one rotation). When the rotor rotates, a loss due to the friction between the air and the rotor surface, called windage loss, occurs.The angle rotor used for high-speed rotation has a truncated conical shape, and the friction between the air and the rotor surface causes a loss. The diameter of the rotor is determined by the dimensions of the sample container (chive) to be used.

On the other hand, it is desired that the windage loss of the rotor be small and that the moment of inertia of the rotor be small due to the conditions for the motor for rotating the rotor at high speed C-rotation. If the windage loss is large, the motor power must be increased accordingly.
The motor becomes larger, the price of the centrifugal separator becomes larger, and the size of the centrifuge becomes larger.

Furthermore, if the moment of inertia is large, a large amount of power is required from the motor when accelerating or decelerating the rotor, which results in a larger motor, leading to an increase in the price and size of the centrifugal separator.

As shown in Figs. 5 and 6, the conventional angle rotor has a block 11 in the shape of a truncated cone, with a center hole 12 formed in the upper surface into which the motor shaft is inserted. A recess 13 is formed, and a bottom C nib block 11 of the recess 13 is formed.
Holding holes 14 into which sample containers are inserted obliquely and radially are formed at equal angular intervals around the bottom surface of the container.

This truncated conical shape allows for small windage, and to support the large centrifugal force generated by high-speed rotation as a lightweight forest material, general aluminum alloys and titanium alloys are used, and recently FRP (reinforced (plastic) has also been put into practical use.However, conventional rotors had a large moment of inertia.

In order to reduce the moment of inertia, it has been proposed to make a hollow rotor with an upper plate and a lower plate as shown in Figure 3 of Japanese Utility Model Publication No. 55-51555.This conventional rotor However, there is a limit to the strength of the peripheral wall that supports the sample container (tube), so it cannot be used at very high speeds.Furthermore, large-capacity containers cannot be held because the load is concentrated on the support.

``Means for Solving the Problems'' According to the present invention, there is provided a motor shaft push-in portion in which a center hole is formed, and a plurality of motor shaft push-in portions formed in the diagonally downward radial direction (two equiangular intervals). The container holding part is configured as a C-ni block, and each of the container holding parts is formed with a holding hole for holding a sample container.The entire block is covered with a truncated conical cover, and the bottom surface of the cover is connected to the bottom cover. The bottom cover may be constructed integrally with the block.

"Example" Figure $1 shows an example of the present invention. Motor shaft push-in part 21
A center hole 22 into which the motor shaft is inserted is formed. A plurality of container holding parts 23 are integrally formed with the motor shaft pushing part 21+2 in the diagonal downward radial direction (bisometric intervals. In other words, as shown in FIGS. 2 and 3, the motor shaft pushing part 21 and The container holder 23 is configured as a single block 24. Each container holder 23 is formed with a holding hole 26 diagonally from the top surface toward the bottom surface (2) into which the sample container 25 is inserted. .

The block 24 is covered with a truncated conical cover 27. The cover 27 (= has a hole communicating with the holding hole 26. The cover 27 is fixed to the top surface of the block 24 with screws 28. The bottom surface of the cover 27 is covered with a bottom cover 29.
is fixed to the bottom surface of the block 24 with a fixing bolt 31.

A portion of the upper surface of the cover 27 from which the sample container 25 protrudes is covered with a rotor lid 32, and a knob 33 is attached to the rotor lid 32.

The bottom cover 29 may be formed integrally with the block 24 as shown in FIG.

[9] Effects of the Invention As described above, according to the present invention, the block 24 is made up of the motor shaft insertion part 21 and the container holding part 23, and can be made light in weight. Since the cover 27 only needs to have the strength to withstand the load due to its own weight, it can be made thin and light. Therefore, the moment of inertia of the rotor becomes small.

Moreover, the overall shape of the cover 27 is a truncated cone, so the windage loss is small. The cover 27 can be easily made by press working. Since the block 24 is configured as a block 24, a rotor with strong mechanical strength can be obtained.As described above, according to the present invention, a rotor with a small windage loss and a small moment of inertia can be obtained, and a small motor can be used to drive this rotor. , a small-capacity centrifuge can be used, and the centrifugal separator can be made smaller and cheaper.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an example of a rotor for a centrifuge according to the present invention, FIG. 2 is a plan view of the block 24, FIG. 3 is a sectional view taken along the line AA in FIG. FIG. 5 is a cross-sectional view showing a conventional centrifuge rotor, and FIG. 6 is a cross-sectional view taken along the line CC in FIG. 5. Agent Taku Kusano + I [Il,
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Claims (2)

[Claims] (1) A motor shaft push-in part in which a center hole is formed and a plurality of container holding parts formed at equal angular intervals in a diagonally downward radial direction with respect to the motor shaft push-in part are integrally constituted as a block, and the container A holding hole for holding a sample container is formed in each holding part, and a truncated conical cover covers the entire block. Centrifuge rotor fixed to. (2) The rotor for a centrifuge according to claim 1, wherein the bottom cover is constructed integrally with the block.