JPH0194603A - Superconducting coil presser - Google Patents

Abstract

PURPOSE:To obtain a title device which is highly safe and can be made small-sized, by providing specific cylindrical stiffening shells and circular spacers, respectively. CONSTITUTION:There are provided a pair of cylindrical stiffening shells 2 having their both vertical end faces 5 shaped in the teeth of a comb and having the inner periphery of the cross section shaped in a semicircle substantially matching the outer periphery of superconducting coils 1 to be restricted and capable of forming substantially one cylinder by engaging said end faces 5 shaped in the teeth of a comb with each other, and circular spacers 4 formed so that the periphery thereof can fit the inner peripheral surface of said cylindrical stiffening shells 2 and the thickness to the inner periphery is substantially same as the thickness of the superconducting coils 1. And, for instance a pair of spacers 4 having a thickness substantially equal to the thickness of the superconducting coils 1 are inserted substantially symmetrically between the superconducting coils 1, and from the outside thereof, the superconducting coils 1 are compressed and pressed with a pair of coil pressers 2 of a cylindrical stiffening construction, and after engaging the comb-teeth sections 5, a connecting pin 3 is inserted into a pin hole provided in the comb-teeth sections 5 to complete the assembly.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a coil holding device for products to which superconducting coils are applied.

[Conventional technology]

Generally, superconducting coils generate a strong electromagnetic force when energized, so they require a strong restraint device. Figures 6 to 8 show conventional hollow-shaped superconducting coil holders for holding down superconducting coils, which are divided into two hollow disc-shaped coil holders 1
A pair of 02 are connected with a connecting pin 103 and made into a stock. An integrated spacer 104 is provided inside the coil presser 102 and projects inwardly, thereby holding the superconducting coil 1 therein. Further, since each coil presser 102 is independent, the assembly of coil pressers 102 is integrated by connecting the flanges 106 at the ends with coil keys 105.

[Problem that the invention seeks to solve]

The conventional superconducting coil restraint device described above has the following problems.

(1) When the superconducting coil 1 is held down by the integrated spacer 104 that is integrated with the coil holder 102, the coil holder 10
A bending moment is generated in the coil holder 102, and the cross-sectional dimension of the coil holder 102 is increased in order to obtain the strength to resist this.

(2) Since the coil holder 102 is a collection of thin hollow disks, each of which is discontinuous, assembly is difficult (it is necessary to assemble the superconducting coil 1 while compressing it one by one in the circumferential direction).

(3) Since the coil presser 102 is a collection of discontinuous hollow disks, the coil key 105 is used to integrate them.
However, only the coil key 105 resists the longitudinal electromagnetic force generated when the coil is energized, and the strength of the coil holder 102 is not utilized.

[Means for solving problems]

As a means for solving the above-mentioned problems, the present invention has provided a superconducting coil whose vertical end surfaces are comb-like, and whose inner periphery in cross section is a semicircle that coincides with the outer periphery of the superconducting coil to be restrained.
A pair of stiffening cylindrical shells that can be engaged with each other with J-toothed end faces to form a saw cylinder; It is an object of the present invention to provide a superconducting coil holding device characterized in that it includes an arc-shaped spacer whose thickness is the same as the thickness of the superconducting coil.

[Effect]

Since the present invention is configured as described above, the integrated sweeter, which was conventionally provided inwardly protruding from the coil holder, is separated and becomes independent as an arc-shaped spacer, and the inner periphery of the coil holder is superconducting. Since the coil is restrained by using a pair of semicircular stiffening cylindrical shells on the outer circumference of the coil, if the stiffening cylindrical shell receives only an internal pressure of First, the superconducting coil can be restrained with only a 7-tension pin.Therefore, safety can be increased and the size can be reduced at the same time.

In addition, unlike the conventional method, the coil retainer is not separated into many parts, but instead has a shell structure that is divided into a small number of parts.By shifting the dividing plane in the longitudinal direction, mechanical continuity in the longitudinal direction is maintained by the shearing resistance of the comb teeth. , the stiffness also increases.

〔Example〕

An embodiment of the present invention will be described with reference to FIGS. 1 to 3.

In these figures, a pair of spacers 4 having approximately the same thickness as the superconducting coil 1 are inserted symmetrically between the superconducting coils l, and a pair of coil holders 2 having a stiffening cylindrical shell structure are used to hold the superconducting coil from the outside. 1 is pressed while being compressed, the comb tooth portion 5 is engaged, and the connecting pin 3 is passed through the pin hole provided in the comb tooth portion 5 to assemble. The spacer 4 and the inside of the superconducting coil 1 resist the coil circumferential force generated during the initial compression of the superconducting coil 1 and when the coil is energized, so the coil holder 2 uniformizes only the radial force of the superconducting coil 1. It is sufficient to bear the burden as internal pressure.

The axial force during energization is resisted by the shear force of the comb tooth portions 5.

Incidentally, in the case of this device, the influence of the internal pressure exerted by the superconducting coil 1 on the coil presser 2, which is the most important, is compared between this embodiment and the conventional example using FIGS. 4 and 5 as follows.

First, in FIG. 5 of the conventional example, when the superconducting coil 1 is held down by the coil presser 102, the superconducting coil 10 (not shown)
The inner periphery of the integrated spacer 104 comes into contact with the cylindrical core, and from then on, an apparent change in volume and shape occurs within the range where the superconducting coil 1, which is an assembly of conducting wires, is formed. , the coil retainer 102 (which acts as a cantilever with respect to the line of symmetry until it is fastened with the connecting pin 103 at 5 as shown in FIG. 7) extends to a semicircular area, and the integral spacer 104 is fixed at one end and the other end is free. The result is the same as if the cantilever at the end was pushed and bent inward of the superconducting coil l, and a large bending stress was generated near the sudden change in the cross-sectional area of the integrated spacer 104 and the thin part corresponding to the cantilever. become. Specifically, on the inner circumferential side of the coil presser 102, there is a combination carbon in the tangential direction,
Similarly, tensile strength acts on the outer periphery, and a large compressive stress accompanied by stress concentration is generated on the inner periphery where the cross-sectional area suddenly changes, and a tensile stress is generated on the outer periphery. Connecting pin 103
After joining the pair of coil holders 102 into a cylindrical shape, the restoring force of the superconducting film l acts in the direction of the radial arrow in FIG.
In particular, when electricity is applied, the electromagnetic force acts as a large force due to the addition of electromagnetic force, but due to the presence of the integrated W spacer 104, the stress flow in the tangential direction is not uniform. , there is still a risk of stress concentration occurring at the section where the cross section suddenly changes, resulting in large local stress. In general, the tensile stress of the outer shell caused by bending the outer shell in the normal direction is much larger than the tensile stress (simple stress) caused by bending the coil holder 102 in this conventional example. There are two structural dangers: bending stress during installation and concentrated stress at the part where the cross-sectional area suddenly changes after installation.

In contrast, in the case of this embodiment, unlike the conventional example, there is no integrated spacer 104, and the corresponding part is partially 4
Since they are made independent, the coil holder 2 has a uniform cross section, and when holding down the superconducting coil 1, the outer periphery of the spacer 4 and the inner periphery of the coil holder 2 freely slide against each other, as shown in FIG. Moreover, since the contact and separation in the normal direction is free, there are almost no dangerous cross sections that generate bending stress. Furthermore, since the cross section is uniform with no abrupt cross-sectional changes and no cross-sectional changes in the case of 7-pressure expansion, the generated stress is uniform simple stress, which is the safest of this type of closed system stress.

As explained above, according to this embodiment, the coil holder has a uniform cross section in the circumferential direction and does not have an integrated sweeter as in the conventional case, so a superconducting coil restraint device which is extremely advantageous in terms of strength can be achieved. Obtainable. In addition, instead of the conventional structure in which a large number of hollow disk-shaped coil holders are arranged in the cylindrical axis direction of the superconducting coil, coil holders with a stiffened cylindrical shell structure having a sufficient length in the cylindrical axial direction are connected, and −
Since the paired comb tooth portions are engaged with each other and connected by pins, a structure with extremely high rigidity can be obtained compared to the conventional example.

In addition, in the above embodiment, the coil presser 10 is used as shown in FIG.
2 are connected in a staggered manner in the vertical direction, but it is not necessarily necessary to connect them in a staggered manner.

〔Effect of the invention〕

Since the present invention is configured as described above, it has the following effects.

That is, by arranging the sweeter independently between the coils, there is no bending moment acting on the coil holder, and the structural size and weight of the coil holder can be reduced.

The coil retainer has a split auxiliary shell structure to reduce weight, and the split surface has a comb-teeth structure to suppress shearing force to the coupling pin.

In addition, by shifting the dividing plane in the longitudinal direction between the upper and lower shells, the comb teeth can resist the action of longitudinal loads.

[Brief explanation of the drawing]

Fig. 1 is a front view of an embodiment of the present invention, Fig. 2 is a left side view thereof, Fig. 3 is a partially cutaway perspective view of an embodiment of the invention, and Fig. 4 is the above embodiment. FIG. 5 is a schematic cross-sectional view of the embodiment for explaining the load condition of external force acting on the structural members, and FIG. 5 is a perspective view of FIG. 4. l...Superconducting coil, 2...Coil holder (supplementary cylindrical shell), 3...Coupling pin, 4...Spacer, 5...Comb teeth part Fig. 6 Fig. 7 Fig. 8

Claims (1)

[Claims] Both vertical end surfaces are comb-shaped, and the inner periphery of the cross section is semicircular approximately coincident with the outer periphery of the superconducting coil to be restrained. a pair of stiffening cylindrical shells capable of forming two cylindrical bodies, the outer periphery of which can be adapted to the inner circumferential surface of the stiffening cylindrical shell, and the thickness up to the inner periphery being approximately the same as the thickness of the superconducting coil; 1. A superconducting coil holding device comprising: a spacer having an arcuate shape.