JPS6124673B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bellows for a vacuum vessel used in, for example, a nuclear fusion reactor.

FIG. 1 shows the general structure of a fusion reactor with bellows. The figure shows the device in a plan view. 1 is a center pole, 2 is a toroidal coil fixed to the center pole 1, 3 is a vacuum vessel with a non-circular cross section inserted through the toroidal coil 2, and 4 is a bellows that connects the ends of the vacuum vessel 3. . Note that FIG. 2 shows a sectional view of a 1/2 portion of this device.

By the way, the bellows 4 has conventionally been constructed in the shape of a bellows having peaks and valleys as shown in FIG. In FIG. 3, numeral 5 is a flange on one end side of the bellows 4, and 6 is a flange on the other end side. Each of these flanges 5 and 6 is bolted to the other flanges of the vacuum vessel 3, so that the bellows 4 is connected between the ends of the vacuum vessel 3 having a non-circular cross section as shown in FIG. Connect and fix along. The vacuum container 3 is divided into two or more parts in the circumferential direction, and two or more bellows 4 are provided in order to prevent thermal expansion due to temperature rise.

In the case of such a structure, since the interior of the vacuum container 3 is normally maintained at a vacuum state of 10 Torr or less, the bellows 4 is deformed by external pressure and compressive force in the longitudinal direction. The transformation at this time is
As shown in FIG. 5, not only the uniform radial displacement v of the mountain but also the local movement u and inclination φ in the axial direction are included. FIG. 6 shows the change in the circumferential direction of the axial movement at the center line of the mountain.

Due to the above-mentioned local deformation, the bellows undergoes large deformation with very small pressure and becomes unusable.
This is due to the low torsional bending rigidity of the bellows. Conventional bellows had the above-mentioned drawbacks.

The present invention provides a bellows for a vacuum container that does not have the above-mentioned drawbacks by forming a reinforcing portion located at the top of the peak on the atmosphere side of the bellows to simply deform the bellows. The purpose is to

Hereinafter, one embodiment of the present invention will be described in detail with reference to FIG. 4 of the accompanying drawings.

In FIG. 4, reference numeral 4 denotes a bellows, which is connected and fixed along the end of the vacuum container 3 having a non-circular cross section via flanges 5 and 6 in the same manner as described above. 7
is a reinforcing portion provided at the apex of the atmosphere-side peak of the bellows-shaped bellows 4, which has a considerably thick cross-sectional structure and is integrated with other parts. This reinforcing portion 7 is integrally formed in a band shape at the top of the atmosphere-side mountain portion existing along the vacuum vessel 3 having a non-circular cross section. Therefore,
This reinforcing portion 7 increases the torsional and bending rigidity of the bellows 4 itself, prevents the bellows 4 from twisting and bending deformation, and maintains the bellows 4 in a simple planar deformation.

As mentioned above, uniform pressure due to external pressure and axial compressive force in the circumferential direction act on the bellows 4.
In the case of the figure, the axial compressive force acts perpendicularly to the plane of the paper. In FIGS. 5 and 6, while the axial compressive force is small, only a simple in-plane deformation v occurs, and the axial displacement u and inclination (rotation) φ are respectively zero. However, as the axial compressive force gradually increases, local deformations u and φ occur and the bellows 4
will generate another deformation mode and cause large deformation. To prevent such deformation, it is desirable to increase the overall thickness of the bellows. However, in the case of a nuclear fusion reactor, for example, it is necessary to have a large bellows resistance in order to limit the image current of the vacuum vessel, and the inside of the vessel becomes high temperature, so a reinforcing part is installed inside the bellows 4. It is undesirable to form.
Therefore, it is optimal to provide a reinforcing portion on the outside of the bellows 4 as described above.

As described above, the bellows 4 is
The torsional bending rigidity of the bellows 4 is increased, and local deformation of the bellows 4 is reliably prevented.

Note that the above-mentioned reinforcing portions 7 do not necessarily need to be provided at all of the vertices of the atmosphere-side peaks of the bellows 4, and the cross-sectional shape is not limited to the illustrated shape, but may be square, triangular, or triangular depending on the situation. Round,
Even if it is formed into an arbitrary shape such as a T-shape, the same effect as in the above case can be achieved.

As described above, according to the present invention, since the reinforcing part with the thick cross-sectional structure is integrally formed along the top of the atmosphere-side mountain part of the bellows, the torsional and bending rigidity of the bellows itself is dramatically improved. It is an inexpensive and highly reliable product that can convert deformations such as twisting and bending into simple planar deformation, and reliably solves the drawbacks of conventional bellows for vacuum vessels with non-circular cross sections, where the inside is hot like in a fusion reactor. can provide something.

[Brief explanation of the drawing]

Fig. 1 is a plan view of a nuclear fusion reactor using bellows, Fig. 2 is a cross-sectional view thereof, and Fig. 3 is a cross-sectional view taken along the line A-A in Fig. 1 showing the structure of a conventional vacuum vessel bellows. , FIG. 4 is a sectional view similar to FIG. 3 showing the structure of a bellows according to an embodiment of the present invention, FIG. It is an explanatory view similar to the figure. 3... Vacuum container, 4... Bellows, 5, 6... Flange, 7... Reinforcement part.

Claims (1)

[Claims] 1. In a bellow of a vacuum vessel that connects one or more ends of a vacuum vessel with a non-circular cross section, which is passed through a toroidal coil fixed to the center pole of a fusion reactor, the bellows are attached to the peak of the atmosphere side peak of the bellows. A bellows for a vacuum container characterized by integrally forming a reinforcing part with a thick cross-sectional structure along the side.