JPS62106857A - Rotor for centrifugal separator - Google Patents

Abstract

PURPOSE:To increase the speed of a rotor body and to enhance the separation effect of a specimen, by providing taper to the outer periphery of a tube adaptor for holding a specimen and the inner wall of an adaptor insert hole so as to fit both of them in a closely contacted state. CONSTITUTION:Taper is formed to the outer periphery of a tube adaptor 5 for holding a specimen and the inner wall of an adaptor insert hole 3 so that both of them are fitted to each other in a closely contacted state to constitute a rotor for a centrifugal separator. Even if downward stress is generated in the tube adaptor 5 for holding the specimen in the axial direction thereof at the time of the operation of the centrifugal separator, said stress is dispersed by the tapers formed to the outer periphery of the tube adaptor 5 and the inner wall of the adaptor insert hole 3 and large stress can be effectively prevented from locally being applied to the contact part of the tube adaptor 5 with the adaptor insert hole 3.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a rotor for a centrifuge, and more particularly, to a rotor for a centrifuge, and more particularly, for separating cells, intracellular substances, viruses, and other samples in fields such as medicine, pharmacy, and agriculture. This invention relates to improvements in rotors for centrifugal separators used in

[Background of the invention]

It is widely known that the higher the rotation speed of a centrifuge and the greater the centrifugal force, the better the sample separation effect. To achieve this, it is necessary to increase the speed of the rotational drive device and at the same time improve the strength of the centrifuge rotor.

Centrifuge rotors are molded from metal or plastic materials, and when designing them, not only measures are taken to reduce the nominal stress (1-aj um, aj) of the entire rotor, but also measures are taken to reduce the local stress. It is also necessary to take into account stress reduction in parts that generate high stress. The reason for this is that the degree of fatigue of the material in the high stress generating portion is large, and fatigue failure occurs during repeated use of the rotor.

Here, two examples of conventionally proposed rotors for centrifuges will be explained based on FIGS. 2 and 3.

First, in FIG. 2, the reference numeral 1 collectively refers to the entire rotor, which is equidistant lv from the center of the rotation axis 2a of the rotor body 2.
K position, and insert the tube adapter insertion hole 3 into the body 2.
．． 3,... (The drawing shows one example of the cheap adapter insertion hole 3 for convenience of explanation) arranged at equal intervals, and the sample holding tube adapter 5 that holds the sample filled cheapp 4. has seven large-diameter flange portions on its upper portion, and the seven-lunge seating surface J is in contact with the stepped portion y of the rotor body 2. In the figure, 6 is the tube adapter 5
The cap that covers the top of the cheep 4 containing the sample is shown.

An example of a centrifugal separation horizontal rotor according to the conventional proposal has the above-mentioned configuration, and as shown in FIG. 2, as the rotor body 2 rotates, the tube adapter 5 receives centrifugal force, and the tube adapter of the rotor body 2 Press the insertion hole 3. Further, a component of the centrifugal force is generated in the downward axial direction of the tube adapter 5, but this component force is received by the 7-lunge seating surface y of the tube adapter 5 and the stepped portion y of the rotor body 2. Therefore, the small diameter portion 5 of the tube adapter 5
Around the base of G and the large diameter 7 flange part 5eL, the small diameter part 5
The receiver stops all the axial component of the centrifugal force applied to the 0, and a large stress is generated. On the other hand, since all of the axial component force of the chive adapter 5 is applied as a surface pressure to the stepped portion y of the rotor body 2, the stress in the vicinity of the stepped portion y of the rotor body 2 also increases locally.

Next, in the centrifugal separation horizontal rotor shown in FIG.
The same reference numerals as in the figure indicate the same parts, and in the centrifugation horizontal rotor shown in Fig. 3, the large diameter 7 flange portion of the sample holding tube adapter 5 shown by the reference numeral B in Fig. However, with this structure, a large surface pressure is applied to the bottom surface 34 of the tube adapter insertion hole 3, so stress in this area is reduced. becomes locally large.

[Purpose of the invention]

The present invention was made as a result of studies to solve the above-mentioned problems of the prior art, and its purpose is to disperse the stress generated downward in the axial direction of the sample holding tube adapter. , improved centrifugation that prevents large stress from being applied locally to the contact area between the Cheve adapter and the adapter insertion hole, increases the speed of the rotor body, and improves sample separation efficiency compared to conventional methods. It is intended to provide a horizontal rotor.

[Summary of the invention]

In order to achieve the above object, the present invention provides tube adapter insertion holes located equidistantly from the rotational axis center of a rotor body and arranged at equal intervals in the body, and a sample fitted into the adapter insertion holes. The centrifugal separation horizontal rotor is equipped with a holding tube adapter, and is characterized in that the outer periphery of the tube adapter and the inner wall of the adapter insertion hole are tapered so that they fit closely together.

[Embodiments of the invention]

Hereinafter, the present invention will be explained based on an embodiment of FIG. 1. In FIG. 1, the same reference numerals as those of the remote separator rotor shown in FIGS. 2 and 3 indicate the same parts, and in the present invention, The gist of this is that the outer periphery of the sample holding tube adapter 5 and the inner wall of the adapter insertion hole 3 are tapered so that the two closely fit together.

Therefore, according to the present invention having the above configuration, even if stress is generated downward in the axial direction of the sample holding tube adapter 5 during operation of the centrifuge, this stress is transferred between the outer periphery of the tube adapter 5 and the adapter insertion hole 3. It is possible to effectively prevent large stress from being applied locally to the contact area between the tube adapter 5 and the adapter insertion hole 3.

〔Effect of the invention〕

The present invention is as described above, and as is clear from the description of the illustrated embodiments, according to the present invention, by dispersing the stress generated in the downward axial direction of the sample holding cheap adapter 5, the tube adapter An improved centrifugal system that prevents large stress from being applied locally to the contact area between the loader body 5 and the adapter insertion hole 3, increases the speed of the loader body 2, and improves sample separation efficiency compared to conventional centrifuges. A rotor for use after separation can be obtained.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional front view of the left half of an embodiment of the rotor for post-centrifugation according to the present invention, and FIGS. 2 and 3 are longitudinal sectional views of the left half of the rotor for post-centrifugation according to conventional proposals It is a front view. 16. rotor, 20. Rotor body, 2G, rotor body rotation axis, 39. Chain adapter insertion hole, 45. Cheap with sample, 50. Tube adapter for holding sample,
60. cap. Name of patent applicant Hitachi Koki Co., Ltd. +1 figure

Claims (1)

[Claims] 1. Located at the same distance from the center of the rotation axis of the rotor body,
A centrifuge rotor comprising tube adapter insertion holes arranged at equal intervals in the body and a sample holding tube adapter fitted into the adapter insertion hole,
A rotor for a centrifuge, characterized in that the outer periphery of the tube adapter and the inner wall of the adapter insertion hole are tapered so that they fit closely together.