JPS588336Y2 - high speed rotating barrel - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a high-speed rotating barrel used for separating and refining uranium components.

In recent years, high-speed centrifugation has been used to separate and purify uranium-235 and uranium-23B, but when performing high-speed rotation, it is important to operate the rotating body at a rotation speed that is well outside its natural frequency due to the weight of the vehicle. Needless to say, this is a good thing.

For example, as shown in Figure 1, carbon fiber reinforced plastic (
The diameter of the cylinder 2 made of CFRP is 200 trr.
mz length is 650 WarL-, thickness is 2 mm,
A rotating body 101 with reinforcing rings 3 fitted on both ends of the cylinder 20
The next natural frequency is about 1200 hertz, so for safety reasons, it is used at less than 800 revolutions per second.

A plurality of such rotating bodies 1 are each mounted on a drive device (not shown) and rotated, while passing the vaporized uranium raw material inside to separate and purify it one by one. However, the efficiency of separation and purification and equipment The disadvantage was that it required a large burden.

On the other hand, although increasing the length of the rotating body 1 has the advantage of improving separation and purification capabilities and reducing the burden on equipment, there are manufacturing constraints that make it difficult to manufacture a long rotating body. there were.

Therefore, as shown in FIG. 2, for example, two rotating bodies 1 may be connected by a connecting member 4 made of a thin metal plate with a circular cross section shaped like a dot.

The connecting member 4 is made of a material having high strength and high elasticity, such as maraging steel, and has a wall thickness of 0.3 to 0.5 times.

When such a rotating body connected to the rotating body 1 is rotated at high speed, the circumferential speed of the cylinder 2 can normally be 650 m/sec, but the connecting member 4 is limited to 450 ''/see i. There was a drawback that the rotational speed was restricted by the circumferential speed of the connecting member 4.

Furthermore, even if the outer circumferential surface of the connecting member 4 is reinforced with a similar or other metal material, a large centrifugal force proportional to the square of the circumferential speed acts, so the circumferential speed is restricted and cannot be increased. Ta.

The high-speed rotating cylinder of the present invention aims to eliminate such drawbacks.
By fitting a reinforcing material with high specific strength to the outer periphery of a connecting member that connects multiple rotating bodies, the circumferential speed of the connecting member is made the same as that of the rotating bodies, and the natural frequency is also lowered to achieve steady rotation. By reducing the resonance time during acceleration in the trench leading to the vibration, and by creating a vibration between the high-order natural frequencies of rotation during steady operation, safer separation and purification can be achieved. .

An embodiment of the high-speed rotating drum of the present invention will be described based on the drawings.

As shown in FIG. 3, in the high-speed rotating drum of the present invention, a connecting member 4 connecting two rotating bodies 1 has a π-shaped circumferential cross section, and the outer peripheral surface of the connecting member 4 is cross-wound with, for example, carbon fiber-reinforced plastic. A reinforcing member 5 formed into a cylindrical shape is fitted therein.

As shown in FIG. 2, the connecting member 4 is made of a material with high strength and high elasticity, such as maraging steel, and has a wall thickness of 0.5 mm.
A reinforcing material 5 with a high specific strength is fitted on the outer circumferential surface of the reinforcing material 5 having a diameter of 3 to 0.5 mm 1 degree, and the limiting circumferential speed of the reinforcing material 5 is the same as that of the rotating body 1.

When the reinforcing material 5 is fitted to the connecting member 4, the reinforcing material 5 is fitted after the connecting member 4 is cooled by soaking it in liquid nitrogen, for example, using a so-called cold fit.

In this way, the high-speed rotating drum is made up of two or more rotating bodies 1 connected on a concentric shaft, but the motor used to drive the high-speed rotating drum is, for example, a small motor that consumes as little power as possible. Therefore, the time required for acceleration from the start of rotation to steady rotation is several hours.

Therefore, in the high-speed rotating body of the present invention, the rotating body 10 is
When the displacements caused by applying loads to both ends of the rotating body 1 and the connecting member 40 are constant, the rotating body 1 and the connecting member 4
The π-shaped horizontal surface 4H of the connecting member 4, the material, the wall thickness, etc. are appropriately selected so that the respective loads are F and f.

As a result, the primary natural frequency (or primary resonance point) of the high-speed rotating drum becomes less than 10 revolutions per second, and as the rotation of the high-speed rotating drum is accelerated, the primary resonance point is found at the so-called rising part. The time it takes to pass through the rotational speed of the primary resonance point is extremely short.

Also, higher-order natural frequencies (or higher-order resonance points) such as 2nd and 3rd order
The amplitude at becomes rapidly smaller as the order increases.

Since the steady rotation speed of the high-speed rotating drum is set between these resonance points, it is extremely safe.

Note that in the case of f/F <1/10, the primary resonance point approaches the steady rotation speed, and as the rotation of the high-speed rotating drum approaches the steady rotation speed, the rate of acceleration decreases.
This is because the time it takes to pass through the next resonance point becomes longer and there is a risk of damage to the high-speed rotating cylinder.
This is because in the case of 00, the connecting member is easy to bend, so the bearing distance of the high-speed rotation cylinder will change greatly, making installation difficult in practice.

In this way, even if a small angle θ of the rotation axis occurs at the resonance point as shown in FIG. Displacement from the normal state of the two rotating bodies can be absorbed.

Also, since the time at the resonance point is relatively short,
The member 4 will not be damaged due to so-called fatigue.

As shown in FIG. 3, the π-shape of the connecting member 4 is a shape in which the outer circumferential surface of the connecting member is wider on both sides than the side surfaces. The connection interval between the connected rotary cylinders can be made thin, and
There is an advantage that a large number of reinforcing materials can be provided.

In other words, in the case of a --cut type, if the width is made wider, more reinforcing materials can be provided, but the inner diameter of that part increases, and the part with the increased inner diameter has a larger width than other parts. , it has the disadvantage that the centrifugal force acts as a dog, resulting in increased pressure and an increased possibility of uranium solidification occurring in that area.

When the circumferentially tangential type is used, there is a drawback that many reinforcing materials cannot be provided.

On the other hand, if the π-shape is used, a large amount of reinforcing material can be provided even if the width of the connecting member, that is, the connection interval of the rotating cylinders to be connected, is reduced, and the possibility of solidification of uranium is minimized. , sufficient reinforcement can be achieved, and if it is made into a π-shape, the gap on the opposite side where the reinforcing material is provided can be used to
Another advantage is that a balance correction member such as copper foil can be attached.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing a conventional rotating body, Fig. 2 is a sectional view of a high-speed rotating body connecting two rotating bodies, and Fig. 3 is a connecting member connecting two rotating bodies in an embodiment of the present invention. Figure 4 is a cross-sectional view of the high-speed rotating cylinder at the resonance point. The numbers used in the figures are the same: 1 is the rotating body, 2 is the cylinder, and 3 is the reinforcement. A ring, 4 a connecting member, and 5 a reinforcing member.

Claims (1)

[Scope of utility model registration request] A connecting member made of a thin metal material in which a reinforcing material with a large specific strength is fitted into a plurality of cylinders made of carbon fiber reinforced plastic used for high-speed rotation.The connecting member is connected on a concentric axis. A high-speed rotating JR characterized by having a π-shaped cross section and a reinforcing member fitted into the outer peripheral surface of the groove.