JP2001104827A - Centrifugal separator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a centrifugal separator main body from being extensively moved at the time of destruction by easily relaxing the rotational energy at the time of rotor destruction with inexpensive constitution. SOLUTION: A belt-shaped steel plate 9 for rotatively housing a protective wall 7 is disposed at the outer periphery of the protective wall 7 and also the steel plate 9 is engaged to a frame 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to improvement of safety when a rotor of a centrifuge is broken.

[0002]

2. Description of the Related Art Conventionally, in a centrifuge for centrifuging a sample at a high speed rotation, sufficient consideration has been given to the destruction of a rotor containing a sample rotating at a high speed. For example, as shown in FIG. 4, in the case of an ultracentrifuge rotating at 30,000 rpm or more, since the rotation energy of the rotor is large, damage to the main body when the rotor is broken is large. For this reason, a protector serving as a protective wall made of a cylindrical alloy steel having a thickness of several tens of millimeters is provided in order to prevent the debris of the rotor or the like from breaking out due to penetration at the time of destruction. The debris collides with this protector,
The collision energy is reduced by deforming the protector. At the same time, the protector is mounted on a steel ball or the like so as to be rotatable. The protector is rotated to receive a couple due to fragmentation as well as deformation, so that the rotational force is not transmitted to the centrifuge body as much as possible. Further, in the case of an ultracentrifuge, a rotor chamber and a protector are arranged in a vacuum container called a chamber having a thickness of several tens of millimeters to reduce windage loss by rotating the rotor so that high-speed rotation is possible. It is fixed to the sandwiching frame with a steel material of several tens of millimeters.

Further, as shown in FIG. 5, in a small-sized / cooled centrifuge having a rotation speed of several thousands to 20,000 rpm, since the rotation energy is relatively small, the outer periphery of the rotor chamber (stainless steel of about 1 mm thickness) is formed. Is covered by a steel plate of about 2 to 5 mm as a protective wall, the steel plate is fixed to a centrifuge frame by welding or the like, and rotational energy at the time of rotor destruction has been absorbed by deformation of the rotor chamber and the protective wall of the steel plate.

[0004]

However, recently, the speed of centrifuges has been increasing, and safety standards (IEC standards) for centrifuges are being applied worldwide. In addition to popping out, the movement of the main body due to destruction is limited, and the structure where the protective wall is fixed to the frame can not absorb the couple due to the fragment collision like the above ultracentrifuge, and the main body is large. It has become very difficult to meet the standards because they move. Therefore, if a thick protector or chamber is provided as in the case of the above-mentioned ultracentrifuge, safety can be sufficiently ensured, but such a large-scale and expensive component cannot be mounted on a low-cost small-sized and cooled centrifuge. That is the fact.

It is an object of the present invention to solve the above-mentioned problems and to provide an inexpensive and protective wall which can be mounted on a low-cost small-sized and cooled centrifugal separator and which can ensure safety.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to provide a motor as a driving source, a rotor rotated by the motor, a rotor chamber accommodating the rotor, and a substantially cylindrical protection wall disposed on the outer periphery of the rotor chamber. And a frame accommodating the protective wall, a belt-shaped steel plate rotatably accommodating the protective wall is arranged on the outer periphery of the protective wall, and the steel plate is fixed to the frame.

[0007] It is also achieved by changing the fixing method to such a degree that the protective wall is rotated by the impact energy when the rotor is destroyed.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A centrifuge according to the present embodiment will be described below with reference to FIGS. FIG. 1 is a side view of a small-sized and cooled centrifuge according to the present embodiment, and FIG.
FIG. 3 is an explanatory view showing a couple applied to the centrifuge body at the time of breakage as viewed from the upper surface of the rotor chamber 2a.
FIG.

As shown in FIG. 1, a rotor 1 which holds a sample and accommodates a rotor 1 rotating at a high speed is provided around the rotor chamber 2.
A protection wall 7 for protecting debris at the time of destruction and a strip-shaped steel plate 9 for fixing the protection wall 7 to a frame 10 are arranged. Although the rotor 1 is rare, it may be destroyed due to corrosion or the like. In particular, since the danger increases as the number of rotations used increases, the destruction of the rotor 1 and the like does not cause the debris such as the rotor 1 to jump out of the centrifuge. A protection wall 7 is provided.
In the case of a small-sized and cooled centrifuge, the rotor 1 shown in FIG.
There is a large problem that the centrifuge body is largely rotated and moved by the couple 8 at the time of destruction, and collides with a nearby worker. Therefore, the outer circumference of the protective wall 7 positioned so as to surround the rotor chamber 2 is wound around a band-shaped steel plate 9, one end of the band-shaped steel plate 9 is engaged with the frame 10, and when the rotor 1 is destroyed, it is caused by a fragment collision of the rotor 1. The couple rotates the rotor chamber 2 and the protection wall 7 inside the strip-shaped steel plate 9 to prevent the couple (rotational force) from being transmitted to the centrifuge body, thereby ensuring safety.

Further, by fixing the belt-shaped steel plate 9 on the side of the frame 10 to such a degree that it is detached by the impact when the rotor 1 is broken, for example, it is fixed in several places with small screws 11 or welding spots are fixed. Since the protective wall 7 and the strip-shaped steel plate 9 can be rotated by reducing the number, the couple (rotational force) can also be prevented from being transmitted to the centrifuge body.

Although the strip-shaped steel plate 9 is fixed to the frame 10 in the present embodiment, the protection wall 7 itself may be separated from the frame 10 by an impact due to destruction.

[0012]

According to the present invention, the rotational energy when the rotor is destroyed can be easily reduced with an inexpensive configuration, so that it is possible to prevent the centrifuge body from largely moving at the time of the fracture.

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of a small-sized and cooled centrifuge according to the present invention.

FIG. 2 is an explanatory diagram showing a couple applied to a centrifuge main body when a rotor is broken.

FIG. 3 is an external view showing a belt-shaped steel plate for attaching a protective wall according to the present invention.

FIG. 4 is a side view showing a conventional ultracentrifuge.

FIG. 5 is a side view showing a conventional compact / cooled centrifuge.

[Explanation of symbols]

1, 1a is a rotor, 2a is a rotor chamber, 3 is a protector, 4 is a steel ball, 5 is a chamber, 6 is a steel material,
7 is a protective wall, 8 is a couple, 9 is a strip-shaped steel plate, 10 is a frame, 11 is a fixing screw, and 12 is a welded portion.

Claims (7)

[Claims] 1. A motor serving as a driving source, a rotor rotated by the motor, a rotor chamber accommodating the rotor, a substantially cylindrical protection wall disposed on an outer periphery of the rotor chamber, and the protection wall. And a frame for accommodating the protective wall, wherein a strip-shaped steel plate for rotatably accommodating the protective wall is arranged on the outer periphery of the protective wall, and the steel plate is engaged with the frame. centrifuge. 2. The centrifuge according to claim 1, wherein one end of the steel plate engaged with the frame is configured to be disengaged by breaking energy of the rotor. 3. The centrifuge according to claim 2, wherein the engagement is a screw engagement. 4. The centrifuge according to claim 2, wherein the engagement is welding engagement. 5. The centrifuge according to claim 2, wherein when the rotor is destroyed, the rotor is rotatable for each of the steel plate, the protection wall, and the rotating chamber. 6. A motor serving as a driving source, a rotor rotated by the motor, a rotor chamber accommodating the rotor, a substantially cylindrical protection wall disposed on an outer periphery of the rotor chamber, and the protection wall. And a frame accommodating the protective wall, wherein the protective wall is engaged with the frame. 7. The centrifuge according to claim 6, wherein one end of the protection wall engaged with the frame is configured to be disengaged by breaking energy of the rotor.