JP2001087677A - Centrifugal separator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure the safety of an operator and enhance the life of a motor by limiting the height of the motor moderately without impairing the appearance of the motor. SOLUTION: An insulating medium is provided on the outer periphery of a nut 5 as a fixing means.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotor for a centrifuge used in the fields of medicine, pharmacy, genetic engineering and the like, and more particularly to a fixing means and an insulating means for the rotor.

[0002]

2. Description of the Related Art As shown in FIG. 3, a conventional rotor 12 (non-conductor) is formed on one end of a rotating shaft 10 after being set on a rotating shaft 10 (conductor) rotated by a motor 9 as a driving source. It is fixed to the rotating shaft 10 by tightening a nut 5 (conductor) that can be engaged with the threaded portion. In the case of the fixing means using the nut 5 as described above, the tip of the rotating shaft 10 and the nut 5 are exposed on the upper surface of the rotor 12.

As another fixing means, as shown in FIG. 4, the rotor 12 'is fixed to the rotating shaft 10 by a set screw 13 arranged in a direction perpendicular to the rotating shaft 10 connected to the motor 9.
Is fixed on the upper surface of the rotor 12 ',
Can be fixed without exposing the tip portion or the like.

[0004]

In the case of the fixing means shown in FIG. 3, when electricity flows through the rotating shaft connected to the motor, electricity flows through the exposed end of the rotating shaft and the nut. Therefore, there is a problem that the worker's body touches the exposed portion. Therefore, by using a so-called cap nut (insulating nut) made of a resin material, it is possible to suppress the trouble when the worker's body is touched, but the resin material is deformed due to a temperature change. Because of the ease, the tightening force is reduced, resulting in a problem that the rotor is loosened and the rotor cannot be securely fixed. In order to eliminate this slack, a nut formed with a threaded portion inside the nut and covering the metal with a resin material can be considered. However, it is still not possible to completely suppress the slack. If the nut shape is too small, the price, handling and the like are restricted due to special specifications, so that it is difficult to select an inexpensive and surely fixable component.

Further, in the case of the fixing means shown in FIG. 4, even when electricity flows to the rotating shaft connected to the motor, the tip of the rotating shaft and the set screw are not exposed on the upper surface of the rotor. Although the problem that the worker's body touches the exposed portion can be avoided, the tightening work cannot be performed unless the fixing position by the set screw is lower than the bottom surface of the rotor. (Vertical length),
That is, the height of the rotor is increased, which not only increases the height of the product than the configuration shown in FIG. There is a problem that the life is shortened. In addition, when the diameter of the rotating shaft is small, the tightening force of the set screw decreases, and when the rotor is made of a resin material or the like, there is a problem that the rotor is easily loosened due to a shape change due to a temperature change.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems, to ensure the safety of workers, and to improve the life of the motor by suppressing the height of the rotor without impairing the appearance.

[0007]

An object of the present invention is to provide a motor as a driving source, a rotating shaft rotatably connected to the motor,
A centrifugal separator having a rotor detachably mounted on a rotating shaft and fixing means for mounting the rotor on the rotating shaft, which is achieved by providing an insulating material on the outer periphery of the fixing means. .

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A centrifuge according to the present embodiment will be described with reference to FIGS. FIG. 1 is a longitudinal sectional side view showing a fixing means of a rotor used in a centrifuge according to the present embodiment, and FIG.
(A) is a plan view and (b) is a side view thereof. As shown in FIG. 1, the rotors 1 and 2 are composed of divided members (a plurality of pieces) divided into upper and lower parts in the rotation axis direction, and are first rotatably connected to a motor 9 as a driving source. At the center of the bottom surface of the rotor 1 mounted on one end of the rotating shaft 10, a hole 3 of 4 mm and an M3 screw hole 4 are formed around the hole 3, and the rotor 1 is made of resin such as plastic, It is formed of a material (non-conductor). At the center of the rotor 2, a space 7 for accommodating a nut 5 described later and an M3 salar fir hole 8 are formed in the periphery thereof. The rotor 2 is made of a resin such as plastic, (Conductor). The rotors 1 and 2 thus formed are connected to the rotating shaft 10.
The rotor 1 is fixed with a nut 5 and a spring washer 6, and the rotor 2 is further fixed with respect to the rotor 1 with a flat screw 11. In addition, since the spring washer 6 has a spring action so that the tightening force of the nut 5 is not reduced and the nut is not easily loosened, the nut 5 can be reliably fixed at a predetermined position.

When the rotor is mounted on the rotating shaft 10, the rotating shaft 10 is first inserted into a hole 3 in the center of the bottom of the rotor 1.
, The rotor 1 is set, and a nut 5 is screwed into a threaded portion formed at the tip end of the rotating shaft 10, whereby the rotor 1 is rotated.
Is integrally fixed to the rotating shaft. Next, the rotor 2 is placed over the rotor 1, the M3 screw holes 4 are aligned with the M3 screw holes 8, the M3 screw holes 11 are inserted therein, and the rotor 2 is fixed to the rotor 1. In this fixed state, the nut 5 is housed in the space 7 of the rotor 2 as shown in FIG.
Since the periphery of the nut is completely covered by the rotor 2, it is possible to reliably prevent the worker's body from easily coming into contact with the nut or the like, thereby improving safety. Also,
With such a configuration, it is possible to provide a rotor having an excellent external shape because the nut and the like are not easily exposed. Further, by adjusting the shape of the nut accommodating portion of the rotor 2 forming the space 7 to the shape of the nut 5, the rotation of the nut 5 can be restricted because the rotation of the nut 5 is inadvertently exerted.

[0010] From the above, the present embodiment, the rotating shaft 10
Since the rotor is attached and detached using the nut 5 at the tip of the rotor, a large load is applied to the bearings disposed inside the motor when the rotor rotates, thereby shortening the life of the motor. Can be prevented, the safety of the worker can be improved by reliably preventing the worker's body from coming into contact with the nut and the like, and it is possible to provide a rotor with more excellent appearance. It has the effect of.

In the above-described embodiment, the nut 5 as the fixing means is insulated by the combination of the rotors 1 and 2 made of an insulating material. For example, a fitting member made of rubber, plastic, or the like that engages with the nut 5 is provided so as not to touch the nut 5, an insulating seal is provided on the nut 5 or the rotating shaft 10, or after the rotor is mounted, the insulating material is removed. The same effect as described above can be obtained even if the outer circumference of the nut 5 flows and is insulated.

[0012]

According to the present invention, by providing an insulating material on the outer periphery of the fixing means, the safety of the worker is secured, and the height of the motor is suppressed without impairing the appearance, and the life of the motor is extended. be able to.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view showing a fixed configuration of a rotor used in a centrifuge according to the present invention.

FIG. 2 is a view as seen from the direction of the arrow in FIG. 1;
(A) is a plan view and (b) is a side view thereof.

FIG. 3 is a vertical sectional side view showing a fixed structure of a rotor used in a conventional centrifuge.

FIG. 4 is a vertical sectional side view showing another fixed configuration of a rotor used in a conventional centrifuge.

[Explanation of symbols]

1 is a rotor, 2 is a rotor, 3 is a hole, 4 is an M3 screw hole, 5
Is a nut, 6 is a spring washer, 7 is a nut accommodating space, 8 is an M3 salami hole, 9 is a motor, 10 is a rotating shaft,
11 is a flat screw, 12 is a rotor, 13 is a set screw, 14
Is a frame, and 15 is a door.

Claims (7)

[Claims] 1. A motor as a drive source, a rotating shaft rotatably connected to the motor, and a rotor arranged on the rotating shaft, further comprising: a rotor mounted on the rotating shaft. A centrifuge comprising a fixing means, wherein an insulating material is provided on an outer periphery of the fixing means. 2. The centrifuge according to claim 1, wherein said rotor is constituted by a divided member made of an insulating material. 3. The centrifuge according to claim 2, wherein said insulating material is plastic. 4. The centrifuge according to claim 1, wherein the fixing means is a nut that can be engaged with a screw formed at a tip of the rotating shaft. 5. The centrifuge according to claim 1, wherein said rotor has a space capable of accommodating said nut. 6. The centrifuge according to claim 5, wherein an engaging portion conforming to the shape of the nut is formed on the rotor where the space is formed. 7. The centrifuge according to claim 1, wherein said rotor is fixed to said rotating shaft by said nut via a spring washer.