JPS6130611B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotating barrel of a gas centrifuge employing a scoop tube system.

Conventionally, a gas centrifuge is known as a device for separating a gas mixture into its respective components. Generally, this gas centrifuge has a rotating body that is rotated at an ultra-high speed, and the main elements are a cylindrical body and a pair of end plates that close openings at both ends of the body. Introducing the gas to be separated into the cylinder,
The gas to be separated is separated into a heavy gas component layer and a light gas component layer by utilizing a high centrifugal force field within the rotating drum, and the gas in each layer is separately discharged to the outside of the rotating drum.

Accordingly, this type of separator is broadly classified into an end plate type and a scoop tube type based on the means for discharging the separated gas to the outside of the rotary drum. The end plate method is a pair of end plates with holes provided in each end plate, through which each component gas is discharged separately, and the scoop tube method is a method in which a relatively large hole is provided in the center of one end plate. A pair of scoop tubes are inserted into the rotating barrel through the holes in a non-contact state with the rotating barrel,
Each component gas is separately discharged through this scoop pipe.

Incidentally, a gas centrifuge using a scoop tube system is generally constructed as shown in FIG. That is, the rotary cylinder 5 is rotatably housed in a case 4 consisting of a cylindrical part 1 whose axis line is parallel to the direction of gravity, and upper and lower lids 2 and 3 that cover the upper and lower openings of the cylindrical part 1. are doing. The rotating body 5 includes a cylindrical body 6, upper and lower end plates 7 and 8 that close the opening at the lower end of the body 6, and an upper end plate disposed within the body 6 and near the upper end plate 7. Between 7 and
For example, it is composed of a baffle plate 10 that forms a light gas component collection chamber 9, and a buffle plate 12 that is similarly arranged near the lower end plate 8 and forms a heavy gas component collection chamber 11 between it and the lower end plate 8. As shown enlarged in FIGS. 2 and 3, the buff-full plates 10 and 12 are integrally formed by boring or other cutting when forming both end plates 7 and 8. An annular part 14 that is parallel to the plates 7 and 8 and has an outer diameter smaller than the inner diameter of the trunk body 6 and has a hole 13 in the center, and a peripheral edge of this annular part 14 and both end plates 7,
8 and a cylindrical portion 15 that connects with the inner surface of the tube. The cylindrical portion 15 of the baffle plate 12 has holes 16 for introducing heavy gas components into the collection chamber 11.
There are several.

Therefore, a shaft member 17 is provided at the center of the outer surface of the lower end plate 8.
protrudes coaxially, and the tip of this shaft member 17 is connected to a thrust bearing 18 fixed to the inner surface of the lower lid 3. Furthermore, a rotor 20 of an axial air gear motor 19 is fixed to the outer surface of the lower end plate 8, and provides rotational power to the rotary drum 5 .
A stator 21 of the motor 19 is fixed at a stationary position facing the rotor 20. On the other hand, an annular permanent magnet 22 is fixed to the outer surface of the upper end plate 7, and an annular permanent magnet 22, which together with the permanent magnet 22 constitutes a magnetic thrust bearing 23, is attached to the inner surface of the upper lid 2 facing the permanent magnet 22. 24 is fixed.

Scoop pipes 25 and 26 are inserted into component gas collection chambers 9 and 11 formed in rotating barrel 5 , respectively. Scoop tube 25, 26
are relatively large-diameter holes 2 coaxially opened in the center of the upper end plate 7 and the center of the upper cover 2, respectively.
7, 28 and is inserted in a non-contact state with the rotary cylinder 5 , and the tip portion 25a where the suction port is located,
26a is located at the periphery of each gathering room 9,11. In addition, 29 in the figure is the scoop pipe 25, 26.
A feed pipe is inserted concentrically into the rotary shell 5 , 30 is a flange for maintaining airtightness, and 31 is a molecular pump that lowers the pressure of the atmosphere in contact with the outer surface of the shell body 6.

According to this device, when the gas to be separated is fed into the feed pipe 29 while the rotary drum 5 is being rotated at an extremely high speed by the motor 19, this gas is discharged into the rotary drum 5 from the supply port 29a. Since the rotating drum 5 rotates at an extremely high speed, the introduced gas is affected by centrifugal force, and heavy gas components gather at the periphery and light gas components gather near the center. Then, after passing through the gap P between the cylindrical part 15 of the full plate 12 and the inner surface of the trunk body 6, the heavy gas component enters the gathering chamber 11 through the hole 16 provided in the cylindrical part 15, Thereafter, it is discharged to the outside through the scoop pipe 26. Further, the light gas component enters into the gathering chamber 9 through the hole 13 provided in the center of the baffle plate 10, and is then discharged to the outside through the scoop pipe 25.

However, the rotating barrel for a gas centrifuge constructed as described above has the following problems.

That is, (1) in forming the separated gas collecting chambers 9, 11, both end plates 7, 8 are bored and the buttful plates 10, 12 are machined out, which requires a long time to process. As a result, productivity decreases and work efficiency deteriorates. (2) Cutting processes such as boring cannot reduce the thickness and weight of the full plates 10 and 12. (3) When the full plates 10 and 12 are formed by cutting, unless the walls are made thinner, weldability with the trunk body will deteriorate and mechanical strength will decrease. (4) It is difficult to balance the end plates in the circumferential direction.

This invention was made to solve the above problems, and its purpose is to be suitable for mass production,
It is an object of the present invention to provide a rotary barrel for a gas centrifuge, which has excellent mechanical strength and workability, and is applicable to a scoop tube type device having a structure that does not cause a decrease in separation efficiency.

Embodiments of the present invention will be described below with reference to FIGS. 4 and 5.

Note that the drawings only show the main parts of the rotary drum according to the present invention, and the other parts are omitted because they are almost the same as the conventional ones. Even in the main parts, the same parts as in Figs. , and redundant explanations will be omitted.

The rotary cylinder according to the present invention differs from conventional rotary cylinders in that it has an end plate and a baffle plate that forms a gas collecting chamber between the end plate and the end plate.

That is, in this invention, as shown in FIG. 4, the end plate 35 and the baffle plate 36 are formed of independent members. This FIG. 4 shows the end plate and the baffle plate located on the light gas component collection chamber 9 side shown in FIG. 1. The end plate 35 has an end plate main body 41 having a hole 40 for inserting a scoop tube in the center.
A first cylindrical part 42 integrally extends from the peripheral edge of the end plate main body 41 toward the trunk main body 6 side, and a first cylindrical part 42 integrally extends outside the trunk main body 6 from this cylindrical part 42 to the trunk main body 6 side.
and a second cylindrical part 43 having an inner diameter larger than the inner diameter of the first cylindrical part 42, which is joined to the end thereof by press-fitting or welding after press-fitting. The end plate 35 is formed from high tensile strength steel, such as a maraging steel plate, by press working.

On the other hand, the buttful plate 36 includes a buttful plate main body 45 having a hole 44 for inserting a scoop tube in the center,
The inner diameter of the trunk body 6 that extends integrally from the peripheral edge of the buff-full plate body 45 into the first cylindrical part 42 of the end plate 35 and is press-fitted to the first cylindrical part 42. A small diameter cylindrical portion 46 is formed to have a smaller inner diameter. The buff-full plate 36 is also formed by press working from high tensile strength steel, for example, a maraging steel plate, and the small diameter cylindrical portion 46 is press-fitted into the first cylindrical portion 42 of the end plate 35 as described above. As a result, it is fixed to the end plate 35, and a light gas component collection chamber 9 is formed between the end plate 35 and the end plate 35. On the other hand, as shown in FIG. 5, the end plate 35a and the baffle plate 36 located on the side of the heavy gas component gathering chamber 11 are constructed in the same manner, and both and the trunk body 6 are connected by the same means. However, no hole for inserting a scoop tube is formed in the end plate 35a on the side of the heavy gas component collection chamber 11. In addition, a hole 47 for introducing heavy gas components is formed in the small diameter cylindrical portion 46 of the baffle plate 36.
Only these two points are different.

In this way, the end plates 35, 35a and the full plate 3
6 are formed as separate members, and the two are connected by press-fitting and fixing. Since both are formed by press working and connected by press-fitting, not only can products with uniform wall thickness, so-called well-balanced dimensions, with high dimensional accuracy be manufactured in large quantities easily, but they can also be easily assembled. Also, make it easier to
Mass productivity can be greatly improved. Also,
The end plates 35, 35a and the buff full plate 36 are connected by press-fitting the tip of the small diameter cylindrical part 46 of the buff full plate 36 into the first cylindrical part 42 of the end plate 35, 35a. , end plates 35, 35a
By making the wall thickness of the small-diameter cylindrical portion 46 larger than that of the buttful plate 36 or by making the thickness of the small-diameter cylindrical portion 46 larger than the axial length of the first cylindrical portion 42, the small-diameter cylindrical portion 46 is The amount by which the first cylindrical portion 42 expands due to centrifugal force can be easily set to be larger than that of the first cylindrical portion 42 . Therefore, the occurrence of a situation in which the buff-full plate 36 separates from the end plates 35, 35a during rotation can be prevented, and stable performance can be achieved.

[Brief explanation of the drawing]

Figure 1 is a vertical cross-sectional view showing an example of a conventional scoop tube type gas centrifuge, and Figures 2 and 3 are enlarged views of the gas collecting chamber in the rotating barrel in Figure 1, showing only the right half. FIGS. 4 and 5 are vertical sectional views showing only the right half of the gas collecting chamber portion of a rotary drum according to an embodiment of the present invention, respectively. 4... Case, 5... Rotating body, 6... Body body,
9...Light gas component collection chamber, 11...Heavy gas component collection chamber, 25, 26...Scoop pipe, 35, 35a
...End plate, 36...Bullet plate, 40,44...
hole, 41... end plate main body, 42... first cylindrical part,
43... Second cylindrical part, 45... Buff full plate main body, 46... Small diameter cylindrical part.

Claims (1)

[Claims] 1. A trunk body formed in a cylindrical shape, a pair of end plates that are provided to close openings at both ends of the trunk body and have a hole for inserting a gas guide tube in the center of one of them, and the trunk body. A gas centrifuge comprising a pair of buttful plates arranged in the main body, each forming a gas collecting chamber between the end plates and each having a hole in the center for inserting a gas guide tube. In the machine rotary shell, each of the end plates is formed by press working, and includes an end plate main body and a first cylinder that integrally extends from the peripheral edge of the end plate main body toward the main body side. a second cylinder having an inner diameter larger than the inner diameter of the first cylindrical part that integrally extends from the first cylindrical part to the outside of the trunk body and is joined to the end of the trunk main body. Each of the bent full plates is formed by press working,
The inner diameter of the body body extends integrally from the peripheral edge of the body of the body to the first cylindrical part of the end plate and is press-fitted into the first cylindrical part. A rotating barrel for a gas centrifuge, characterized in that it is comprised of a small-diameter cylindrical part with a small outer diameter.