JPS5940489B2 - gas centrifuge - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Technical Field of the Invention The present invention relates to a gas centrifuge, and more particularly to a separator used for centrifugal separation of uranium hexafluoride and the like.

(0) Prior Art and Its Disadvantages A gas centrifuge has a rotating barrel, end plates provided at both upper and lower ends of the rotating barrel, and baffle plates provided within the rotating barrel.

This baffle plate is made of a plate with a hole in the center, and is usually installed at two locations above and below within the rotating drum.

Therefore, the baffle plate has the function of controlling the flow of gas within the rotary barrel and determining the optimum extraction position of the separated gas, and this function governs the efficiency of the separator.

By the way, when a baffle plate made of a perforated disk rotates,
Stress acts in the circumferential direction.

This circumferential stress is greater at the inner periphery of the baffle plate and smaller at the outer periphery.

However, it becomes abnormally high at the innermost circumference.

Therefore, it can be said that the allowable rotational speed of the baffle plate is within the range in which the circumferential stress acting on the innermost part of the baffle plate does not exceed the allowable stress of the constituent materials. Because it is proportional to the fourth power of the circumferential speed of the rotating body, a high circumferential speed exceeding 500 m/min is required, and the baffle plates of gas centrifuges that require such high rotation speed are made of aluminum alloy. and high-tensile steel, etc.
If it is made of isotropic materials with low specific strength, the circumferential stress acting on the innermost portion will easily exceed the allowable stress of these materials.

In an attempt to solve this problem, it has been proposed to gradually increase the thickness of the baffle plate from the outer periphery to the inner periphery, or to configure it so that only the inner periphery is thick. Since the weight of the baffle plate increases significantly, which limits the rotational speed of the rotary drum, the separation capacity is not improved as much as expected.

Furthermore, in cases where the rotating body is made of fiber-reinforced resin, the elongation of the baffle plate may exceed the elongation of the rotating body even within the permissible speed range.

If this happens, an excessive load will be applied to the rotary drum, causing it to break, or, in the opposite case, a gap will be created between the baffle plate and the inner peripheral surface of the rotary drum, causing gas to leak.

Therefore, in this case as well, the circumferential speed of the rotary cylinder cannot be increased much.

(C) Purpose of the Invention The purpose of the present invention is to solve the above-mentioned drawbacks of conventional gas centrifuges, to provide a gas centrifuge that can rotate its rotary barrel at high speed and has high separation capacity. .

B) Structure of the Invention In order to achieve the above object, the present invention includes a rotating barrel, end plates attached to the upper and lower ends of the rotating barrel, and an opening for introducing gas to be separated into the rotating barrel. It has a pipe, a separation gas scoop pipe, and a perforated disc-shaped baffle plate provided in the rotating body, and the baffle plate is made of fiber-reinforced resin made by reinforcing resin with a reinforcing fiber fabric, and A gas centrifuge is provided, wherein the woven fabric has warp threads extending in the circumferential direction of the baffle plate and weft threads extending in the radial direction, and the warp threads have a longitudinal elastic modulus greater than that of the weft threads. .

To explain one embodiment of the gas centrifuge of this invention,
In FIG. 1 (schematic vertical cross-sectional view), the rotor 1 includes a rotating body 2, an upper end plate 3 attached to the upper end of the rotating body 2, a lower end plate 4 attached to the lower end, and the interior of the rotating body 2. The casing 1 has an upper baffle plate 5 provided at the upper part of the casing 1 and a lower baffle plate 6 provided at the lower part of the casing 1 by the bearing 7.8.
6, and can be rotated at high speed by a drive source (not shown).

Inside the rotating body 2, there is a separation gas introduction pipe 9 with one end open at the center of rotation, and between the upper end plate 3 and the upper baffle plate 5 and between the lower end plate 4 and the lower baffle plate 6. Separating gas scoop tubes 10.11, each open at one end, are provided.

These to-be-separated gas introduction pipe 9 and separated gas scoop pipe i
o and i1 are fixed and do not rotate together with the rotor 1.

The rotating body and the upper and lower end plates are made of a material with high specific strength, such as aluminum alloy, high-strength steel, and preferably carbon fiber reinforced resin.

Further, the upper and lower baffle plates are each made of a disk having a hole in the center, and are arranged perpendicularly to the center of rotation of the rotary drum.

Further, the lower baffle plate is provided with notches at equal intervals on its outer circumference, and slits 12 are formed between the lower baffle plate and the inner circumferential surface of the rotary drum 2.

The upper and lower baffle plates are made of fiber-reinforced resin, which is made by reinforcing resin with a woven fabric of reinforcing fibers.

The upper and lower baffle plates are made of fiber-reinforced resin, which is made by reinforcing resin with woven reinforcing fibers, as described above.

As shown in FIG. 2 (schematic plan view), the fabric 1
3 is, for example, a spiral fabric, and has warp threads 14 extending in the circumferential direction of the baffle plate and weft threads 15 extending radially in the radial direction.

The weft thread 15 is made of high-strength material such as glass fiber, for example.
The warp yarns 14 are made of high-strength, high-elasticity fibers having a higher modulus of longitudinal elasticity than the weft yarns 15, such as carbon fibers.

As a result, even if the densities of the warp yarns 14 and the weft yarns 15 are the same, the longitudinal elastic modulus of the baffle plate in the circumferential direction is larger than that in the radial direction.

However, the baffle plate depends on the material of the rotating body, etc.
It has a circumferential longitudinal elastic modulus that is 2 to 10 times, preferably 3 to 7 times, the radial longitudinal elastic modulus.

Note that although the radial longitudinal elastic modulus of the baffle plate differs at various locations in the radial direction, the arithmetic mean thereof may be taken.

Examples of resins that form the matrix of such baffle plates include epoxy resins, unsaturated polyester resins, phenolic resins,
Thermosetting resins such as polyimide resins, thermoplastic resins such as polysulfone resins, polyamide resins, and polybutylene terephthalate resins are used.

Now, to explain the operation of the above-mentioned gas centrifugal separator, gas to be separated is first introduced into the rotating drum 2 which is rotating at a prescribed speed from the gas to be separated tube 9.

Then, gas separation occurs due to the mass difference, producing a gas flow as shown by the arrows.

Light gas components near the center of rotation of the rotating barrel 2 pass through the hole in the center of the upper baffle plate 5 and are extracted from the scoop tube 10.

On the other hand, the heavy gas components collected near the inner circumferential surface of the rotating barrel 2 pass through the slit 12 of the lower baffle plate 6 to the lower side and are extracted from the scoop tube 11.

At this time, the upper and lower baffle plates 5 and 6 are
In addition to adjusting the gas flow within the chamber, the optimal extraction position for the separated gas is determined.

Incidentally, in order to facilitate extraction of the separated gas, the scoop tubes 10 and 11 are maintained in a slightly reduced pressure state.

(Feathers) Effects of the Invention The gas centrifuge of the invention is equipped with a baffle plate made of fiber-reinforced resin, which is made by reinforcing the resin with a woven fabric of reinforcing fibers.
Moreover, the above fabric has warp yarns extending in the circumferential direction of the baffle plate and weft yarns extending in the radial direction, and since the warp yarns have a larger longitudinal elastic modulus than the weft yarns, the densities of the warp yarns and weft yarns are the same. Even if there is, the longitudinal elastic modulus of the baffle plate in the circumferential direction can be made larger than that in the radial direction, and stress concentration on the innermost portion of the baffle plate can be reduced.

Therefore, in combination with the fact that the baffle plate is made of fiber-reinforced resin with a high specific strength, the rotary drum can rotate at high speed, improving separation efficiency.

Moreover, since the longitudinal elastic modulus of the warp yarns is larger than that of the weft yarns, in other words, the longitudinal elastic modulus of the weft yarns is smaller than that of the warp yarns, it is extremely easy to arrange the weft yarns relative to the warp yarns. If the warp and weft yarns are made to have the same density and the warp and weft yarns are made to have the same density, such a woven fabric will have excellent stability, especially among woven fabrics in which the warp and weft yarns are interwoven and have a highly stable structure. Therefore, the arrangement of the threads during molding, especially the arrangement of the warp threads extending in the circumferential direction, is less disturbed, and variations in the properties of the baffle plate can be suppressed.

In other words, baffle plates with the same characteristics can be easily obtained, and even if a plurality of baffle plates are installed, the rotor can be easily balanced and rotated at higher speeds.

In addition, if the rotating body is also made of fiber-reinforced resin, by selecting the type of reinforcing fiber, it is possible to make the elongation of the baffle plate follow the elongation of the rotating body appropriately, and it is possible to prevent the elongation of the baffle plate from excessive If a heavy load is applied to it, it may be destroyed,
On the other hand, it is possible to prevent inconveniences such as gas leakage caused by a gap with the inner circumferential surface of the rotary drum or the baffle plate coming off during rotation.

[Brief explanation of the drawing]

FIG. 1 is a schematic vertical sectional view showing one embodiment of a gas centrifuge of the present invention, and FIG. 2 is a schematic plan view showing an example of a fabric used for the baffle plate. 1... Rotor, 2... Rotating cylinder, 3...
... Upper end plate, 4... Lower end plate, 5...
... Upper baffle board, 6... Lower baffle board, 7
, 8...Bearing, 9...Separated gas introduction pipe, 10, 11...Separated gas scoop pipe, 12...Slit, 13... ···fabric,
14... Warp of the fabric, 15... Weft of the fabric, 16... Casing.

Claims (1)

[Claims] 1. A rotating body, end plates attached to the upper and lower ends of the rotating body, a separation gas introduction pipe and a separation gas scoop pipe opened in the rotating body, and a perforated circle provided in the rotating body. and a plate-shaped baffle board, the baffle board being made of a fiber-reinforced resin made by reinforcing the resin with a reinforcing fiber fabric,
A gas centrifuge, wherein the fabric has warp threads extending in the circumferential direction of the baffle plate and weft threads extending in the radial direction of the baffle plate, and the warp threads have a longitudinal elastic modulus greater than that of the weft threads.