JPH0628199Y2 - Centrifuge rotor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Industrial field of application" The present invention relates to a swing rotor of a centrifuge.

“Prior Art” Generally, a swing rotor of a centrifuge has four sample containers.
There were 6 places, 6 places and 8 places. When sample containers of the same size are used in a centrifuge, the larger the number of multiplications, the smaller the angle of the root of the rotor yoke per sample container. For example, 360 ° for 4 places
/ 4 = 90 °, 360 ° / 8 = 45 ° when multiplying by 8 places. For this reason, in order to use the same size sample container, the diameter of the rotor must be increased, which causes the centrifuge to become large and expensive, and also to be placed on the laboratory desk occupied by the centrifuge. And an increase in the floor area, which deteriorated the environment of the laboratory.

In order to solve this, it suffices to hang it in two places. That is, the swing rotor having two places has an H-shaped structure in which the yoke does not pass through the rotation axis of the rotor and the yokes are parallel to each other, as compared with a rotor having a plurality of yokes having three or more places. According to this structure, it is possible to secure a large space between the rotor yoke and the rotary shaft, which cannot be realized by the conventional rotor.

However, it has been empirically known that a swing rotor with two parts tends to cause abnormal vibration during acceleration or deceleration, which hinders its realization. In other words, the balance of the rotating body is best obtained with a uniform disk, so that it rotates stably. However, in the case of a centrifuge that has multiple yokes and a bucket (sample container) that holds the sample at its tip is held, the load generated by centrifugal force is not evenly distributed like a disk, so imbalance Is likely to occur, and when rotated, vibration is likely to occur due to the imbalance. In particular, the two-placed rotor is in the most extreme unbalanced state because the masses in the direction in which the pair of sample containers are perpendicular to each other are significantly different.

[Means for Solving the Problem] According to the present invention, a counterbalance having substantially the same mass as that when the buckets are loaded is provided in a swing rotor having two places in a direction perpendicular to a direction in which a pair of buckets (sample containers) are suspended. To be

In this way, stable rotation is obtained. That is, the centrifugal load generated by the sample container generated when the rotor is rotated and the centrifugal load generated by the counter balance generated in the direction orthogonal thereto are approximately the same in magnitude, and are equivalent to those of four-placed rotors. .

"Embodiment" FIGS. 1 and 2 show an embodiment of the present invention. A pair of yokes 11 and 12 parallel to each other in a plane perpendicular to the axis 10 of the rotating shaft are arranged symmetrically with respect to the rotating shaft. The intermediate portions of the yokes 11 and 12 are integrally connected by a connecting portion 13, and a rotary shaft insertion hole 14 is formed in the connecting portion 13. Pins 15 are attached to both ends of the yokes 11 and 12 so as to face each other. A sample container (bucket) is hung between these pins 15.

In this invention, counter balances 16 and 17 are provided in a direction passing through the rotary shaft and perpendicular to the yoke. For this attachment, attachment plates 18 and 19 are extended at right angles from the centers of the yokes 11 and 12 to the outside. Its mounting plate 1
Counterbalances 16 and 17 are attached to the ends of 8 and 19, respectively. The counter balances 16 and 17 are selected so that the centrifugal load caused thereby becomes almost the same as the centrifugal load applied to the sample container. Therefore, this rotor is equivalent to a four-place rotor.

3 and 4 show another embodiment of the present invention.
The parts corresponding to those in FIGS. 2 and 3 are designated by the same reference numerals.
In this example, the central portions of the yokes 11 and 12 are bulged outwardly to form wide portions 21 and 22, and counter balances 16 and 17 are attached to the wide portions 21 and 22, respectively.

[Advantage of Invention] According to this invention, since the rotor yoke is H-shaped, a wide space can be provided between the sample container hung on the rotor yoke and the rotating shaft. For this reason, when the blood bag is inserted in the adapter into a cylindrical shape and inserted into the sample container, it is difficult for the tubes connected to the blood bag to come into contact with the rotor yoke and the center of the rotor, which may cause abnormal vibration. Absent. In this way, the rotor yoke is H-shaped and is hung in two places. However, due to the existence of the counter balance, it acts equivalently as four places, and the balance is good, and vibration is unlikely to occur. Moreover, it can be made compact.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of the present invention, and FIG. 2 is a first view.
FIG. 3 is a sectional view, FIG. 3 is a plan view showing another embodiment of the present invention, and FIG. 4 is a sectional view taken along the line ABC of FIG.

Claims (1)

[Scope of utility model registration request] 1. A pair of yokes, which are parallel to each other in a plane perpendicular to the rotation axis, are symmetrically arranged about the rotation axis, and pins which rotatably hold a pair of sample containers are provided at both ends thereof. A centrifuge rotor formed at right angles to the yoke and facing each other, wherein a counter balance is provided in a direction passing through the rotary shaft and perpendicular to the yoke. .