JP3075836B2 - Coil hoop force adding device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for applying a hoop force to a coil, which is used at the time of manufacturing and testing a coil in which a large electromagnetic force exerts a hoop force such as a nuclear fusion device.

[0002]

2. Description of the Related Art A large electromagnetic force acts on a coil used in a high magnetic field such as a poloidal coil of a nuclear fusion device. In particular, when the coil is a superconducting coil, the current value is large, and a hoop force due to a large electromagnetic force acts. In order to confirm its soundness, it is necessary to conduct a hoop force addition test in which a simulation force of an electromagnetic force is mechanically added.

FIG. 3 shows an example of a conventional hoop force adding test apparatus.
And FIG. FIG. 3 is a plan view of the hoop force applying device, and FIG. 4 is a sectional view taken along line AA of FIG. In these figures, reference numeral 1 denotes a coil. In the case of a large coil such as a poloidal coil of a nuclear fusion device, it is generally wound and formed for each double pancake, and a plurality of double pancakes are stacked and pressure-molded. And molded into an integral coil.

[0004] 6 is a cash, 7 is a hydraulic ram, 8 is a hydraulic ram 7
And a base for supporting the coil 1;
At 10, the coil 1 is mounted on the gantry 8 so as to be movable in the radial direction. Each hydraulic ram 7 is connected to a hydraulic pump (not shown). At the time of the hoop force test, high pressure oil is supplied to each hydraulic ram 7 and a load equivalent to the electromagnetic force acting on the coil 1 is applied to measure the deformation and stress of each part of the coil 1 to evaluate rigidity and soundness. Verify.

[0005]

In such a hoop force applying apparatus for a coil, even if the curvature of the coil 6 and the coil 1 is the same, the coil 1 expands as the load is applied, and the coil 6 and the coil 6 expand. Since the wire was in line contact, a bending moment acted on the coil, and a pure hoop force could not be obtained. Therefore, accurate verification of stress and deformation due to actual electromagnetic force could not be achieved. Although there is a method of increasing the number of hydraulic rams 7 to increase the accuracy, there are many problems such as the upper limit of space and the complexity of adjusting the stroke of each hydraulic ram 7.

[0006] When pressure molding at the time of manufacture, about 150
It is put in an electric furnace to heat to ℃, but in this method, it is impossible to keep it at a constant pressure for a long time because there is a small leak from the hydraulic ram. I could not do it.

The present invention has been made based on the above circumstances, and provides a coil hoop force adding device which can apply a hoop force equal to an electromagnetic force and can be used for a pressure mold at the time of manufacture. The purpose is to provide.

[0008]

In order to achieve the above object, in the present invention, a rubber tube is mounted on the inner peripheral side of the coil, and a pressure medium is supplied from an external pressure medium supply source to the rubber tube. The coil and rubber tube are housed in a fixture so that they can move in the radial direction.

[0009]

With such a structure, the rigidity of the rubber tube and the protective body is extremely low as compared with the coil and can be ignored, so that the pressure applied to the rubber tube by the pressure medium substantially acts on the coil. Even if a load is applied and the coil is deformed, the protective body and the tube easily follow, so that a uniform load equivalent to the electromagnetic force can be applied. Further, at the time of pressure molding, the pressure medium can be prevented from leaking by sealing the pressure medium into a rubber tube with a valve or the like, so that pressure molding can be performed in an electric furnace with the pressure applied.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a coil hoop force applying apparatus according to the present invention will be described below with reference to FIGS.

FIG. 1 is a plan view of the hoop force applying device, and FIG. 2 is a sectional view taken along line AA of FIG. The same parts as those of the conventional example shown in FIGS. 3 and 4 are denoted by the same reference numerals, and the description of the overlapping parts will be omitted.

In FIGS. 1 and 2, a rubber tube 12 is mounted on the inner peripheral side of the coil 1 via a rubber protector 11.
Fixing jig consisting of upper plate 9, gantry 8, and fastening bolt 10
It is stored in 13. A pressure medium supply port 12 a is fixed to the rubber tube 12, and a pressure gauge 15, a pressure relief valve 16
And a high-pressure hose 18 connected thereto.

The operation of the embodiment constructed as described above will be described. The pressure P kg / cm ² is applied to the rubber tube 12 from the pressure medium supply source 17 by the high pressure hose 18. When the pressure medium is supplied, the inner circumference of the coil 1 is almost Pkg / cm ² Pressure works uniformly all around. At this time, a protector 11 is mounted to prevent the rubber tube 12 from protruding into a minute gap between the coil 1 and the fixing jig 14 and between layers of the coil 1 and the like. The hoop force acts on the coil 1 by applying pressure, and the coil 1 expands.
Since the rigidity of the rubber tube 11 and the rubber tube 12 is extremely low as compared with the coil 1, the deformation of the coil 1 can be easily followed. Therefore, a hoop force equivalent to the electromagnetic force actually acting on the coil 1 can be added, so that the deformation and stress generated in the coil 1 can be accurately evaluated. Next, the pressure mold at the time of manufacturing will be described.

In general, when forming a coil, a resin-containing tape is wound around a conductor to form a wire insulation, and after winding the double pancake, it is heat-molded in an electric furnace while pressurizing and integrated.

At the time of pressure molding, a pressure required for molding is applied to the rubber tube 12 with a pressure medium, the valve 14 is closed and sealed, and the fixing jig 13 is put into an electric furnace and heated and molded.

In this embodiment, the protector 11 is used to improve the reliability of the rubber tube 12 against breakage. However, the rubber tube 12 may be used alone. In this case, even if the thickness of the rubber tube 12 at the place where the rubber tube 12 easily protrudes is increased, the same effect as that obtained by using the protective body 11 can be obtained.

[0017]

As described above, according to the present invention, it is possible to apply a hoop force equal to an electromagnetic force to a coil and to apply a high-performance coil to a coil at a predetermined pressure during manufacture. Hoop force adding device can be obtained.

[Brief description of the drawings]

FIG. 1 is a plan view showing a coil hoop force applying device according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA in FIG. 1;

FIG. 3 is a plan view showing a conventional coil hoop force applying device.

FIG. 4 is a sectional view taken along line BB of FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Coil 6 ... Contact 7 ... Hydraulic ram 8 ... Stand 9 ... Upper plate 10 ... Fastening bolt 11 ... Protective body 12 ... Rubber tube 12a ... Pressure medium supply port 13 ... Fixing jig 14 ... Valve 15 ... Pressure gauge 16 ... Pressure relief valve 17… Pressure medium supply source 18… High pressure hose

──────────────────────────────────────────────────続 き Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G01N 3/00-3/62 G21B 1/00

Claims (1)

(57) [Claims] 1. A coil device comprising: a fixture for accommodating an annular coil; a rubber tube disposed inside the coil; and a pressure medium supply source for supplying a pressure medium into the tube. Hoop force adding device.