JPH02134802A - Manufacture of superconducting magnet. semiconductor single-crystal pulling apparatus, nuclear magnetic resonance apparatus, superconducting magnet - Google Patents

Abstract

PURPOSE:To obtain a superconducting magnet in which no quench occurs and which generates magnetic fields efficiently and which can be operated stably at a high load ratio by installing a superconducting coil, specific reinforced resin flange and coil support. CONSTITUTION:This apparatus comprises a superconducting coil 10, reinforced resin flanges 2, 2' impregnated with resin integrally with the coil 10 on at least one end surface of the upper and lower end surfaces of the superconducting coil 10, and coil supports 3, 4 which hold and absorb the stress in a direction radial of the superconducting coil 10 via the flanges 2, 2' and a plurality of bolts 11. For example, the coil 10 is impregnated in one piece with the upper and lower FRP flanges 2, 2' of a winding section 1 so that no winding frame exists on a bore 9. The coil 10 is held by many thin bolts 11 from the lower side of the lower FRP flange 2 and is not suspended from the above. The weight of the coil 10 is received by a metal or FRP support 3 and it is suspended from the upper metal or FRP support 3 on a plurality of studs.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention is applicable to research high magnetic field generators, physical and chemical nuclear magnetic resonance (NMR) devices, quasicrystal pulling devices, electron beam transfer devices, etc. This article relates to a method for manufacturing vertical superconducting magnets used in

(Prior Art) NbTi superconducting coils used for industrial, medical, etc. use NbT [! It is common to use it by winding it tightly. If a quench occurs in which the superconductivity of the superconducting coil is broken while these devices are in use, the large liquid helium will be released into the atmosphere, which is dangerous, and it will take a lot of time and money to put them back into use. spend. Therefore, designers of these superconducting coils usually set a margin of 30 to 50% for the load factor of the superconducting wire to ensure safety.

In the case of a non-immersed coil, the cause of quenching that causes the characteristics to deteriorate is heat generated by friction due to movement of the conductor of 10/jm to 100 μm. One possible method for preventing this is to increase the tension of the first winding to strengthen the radial stress of the fifth winding, thereby reducing the movement of the conductor with strong frictional force. Although it is possible to increase the quench current to some extent with this method, it is impossible to stop the movement itself. In addition, in a coil manufactured with strong winding tension, the first winding part is strongly pressed against the winding frame even when energized, so the axial contraction force of the winding m part due to the electromagnetic force ζ causes the gs part of the coil to Shear force concentrates at the boundary between the winding section and the winding frame, and even with training, the critical current value is often not reached.

One way to suppress the movement of the conductor is to cover the entire coil with epoxy or the like. However, when a coil is integrated with a metal winding frame, shear stress concentrates between the winding frame and the winding part, causing cracks and peeling from the winding frame, resulting in a change in characteristics. Normally, it was difficult to operate the coil at a high load factor.

Operating the coil at a high load factor immediately reduces NbTi energy and reduces costs, but it also has great benefits as it leads to higher efficiency in magnetic field generation, a reduction in the amount of liquid helium, and a more compact system as a whole. For the reasons mentioned above, it has been difficult to produce a stable coil that can be used at high load factors.

(Challenges to be solved by the invention) As mentioned above, a superelectric 4-magnet that does not suffer from quenching, can efficiently generate a magnetic field, and can be stably operated at a high load rate, and a semiconductor single crystal using the same. A pulling device, etc. has been eagerly awaited, and the present invention provides a superelectric 4 magnet that satisfies this demand.
The present invention provides a semiconductor single crystal pulling device, a nuclear magnetic resonance device, and a method for producing a superconducting magnet using the same.

[Structure of the invention]

(Means for solving the problem) The heathered fabric is used only during winding and impregnation, and there is a winding frame (@muku jig) that is removed after winding and a coil at the top and bottom of the first winding part. Equipped with a reinforced resin (FRP) flange that is immersed in one piece, and after manufacturing, there is no metal cylinder in the bore part.
Tilenoid coil.

Furthermore, it includes a support mechanism that holds the coil from below with bolts through a plurality of screw holes drilled in the lower flange of the coil.

(Function) The present invention is based on a coil impregnated with resin such as epoxy, which makes it possible to suppress the movement of the conductor inside the coil. Since the winding frame (winding jig) is designed to be removed after impregnation, there is no metal cylinder in the bore part, and the shear stress between the winding frame and the winding part can be minimized.

Therefore, this can prevent the resin such as epoxy from cracking or peeling.

The coil is supported by bolts from the bottom of the FRP flange, so no tensile force is applied between the flange and the winding, which prevents cracks in this area. Furthermore, by making the length of the bolt long to a certain extent, it is possible to absorb radial deformation of the coil due to electromagnetic force, etc., and prevent undesirable stress from being applied from the support structure.

(Example) FIG. 1 shows an example of the present invention. The coil 10 is integrally impregnated with the upper and lower FRP flanges 2, 2' of the winding part 1, and the bore 9 has no winding frame. The coil 10 is supported from the lower side of the lower FRP flange 2' by a large number of thin bolts 11, so that it does not hang from the upper side. The weight of the coil 10 is supported by a supporting material 3 made of metal or FRP, and this is suspended from a supporting material 4 made of metal or FRP above by a plurality of studs. The upper FRP flange 2 of the coil 10 and the metal or FRP support member 4 are pressed together with a plurality of spring washers 5 so that no tensile force is applied, and at the same time, this prevents the coil 10 from swinging laterally. This is to prevent this.

FIG. 2 is an embodiment showing the method of manufacturing a coil according to the present invention. Winding frame cylinder 6 that can be divided into 4 or more pieces in the coil axial direction
are fixed to the upper and lower winding frames 7.7' with screws 8°8'. The upper and lower FRP flanges 2.2' of the coil are fixed to the winding frame 7.7'.

The inside diameter of the side line part and the part to be removed after impregnation are covered with a Teflon sheet or the metal surface is coated with Teflon so that it can be easily removed after being immersed. After the coil is wound, the outside diameter is covered with a thick glass sheet, impregnated with epoxy, and heat-cured. It was confirmed that the image on the winding frame could be easily removed due to the action of Teflon applied to the metal surface.

〔Effect of the invention〕

The superconducting coil manufactured in accordance with the present invention can reach the critical current of the superconducting wire with very few training sessions of 0 to 3 times, so it is possible to adopt a working load factor of 80 to 100%, and it is possible to use a working load factor of 80 to 100%. Soak.

Alternatively, it is possible to significantly reduce the amount of conductor compared to the common sense load factor of 40 to 70% for a coil that is immersed integrally with a metal winding frame.

Since the winding frame is removed after impregnation, the effective winding frame thickness can be extremely thin, for example, about 0.2 mm to 1 nm or less. 5-10mm of normal stainless steel etc.
The amount of conductor is saved when compared to a similar winding frame. In addition, the inner diameter of the coil winding can be made smaller relative to the required space, improving the efficiency of magnetic field generation, requiring fewer ampere turns of the conductor, and reducing the ratio of the inner diameter to the coil length. , the required spatial magnetic field uniformity is ditto,
This is very advantageous for magnetic fields that require uniformity, such as in physical and chemical NMR.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a method of supporting a superconducting coil according to an embodiment of the present invention. FIG. 2 is a diagram illustrating a method of manufacturing a one-liner conductor coil according to an embodiment of the present invention. 1...Super' turtle conductor coil winding part, 2.2'...FRP
flange, 3...lower support material, 4...upper support material,
5...Spring washer, 6...Divided two-rolled metal cylinder, 7
, 7'°°° Metal wire winding frame, 8.8'...Metal wire winding frame fixing bolt, 9...Bore, 10...Superconducting coil. Figure 1 Agent: Patent Attorney Isao Noriyuki Mitsuyuki Matsuyama

Claims (6)

[Claims] (1) A superconducting coil, a reinforced resin flange integrally impregnated with resin on at least one end surface side of the upper and lower end surfaces of the superconducting coil, and a flange made of reinforced resin that is impregnated with resin integrally with the coil, and a radius of the superconducting coil that is connected via the flange and a plurality of bolts. A superconducting magnet characterized by comprising a coil supporting material that supports and absorbs directional stress. (2) A semiconductor single crystal pulling apparatus characterized by using the superconducting magnet according to claim 1. (3) A nuclear magnetic resonance apparatus characterized by using the superconducting magnet according to claim 1. (4) A superconducting magnet according to claim 1, further comprising a superconducting coil that generates a higher magnetic field than the magnetic field generated by the superconducting magnet arranged in the bore of the superconducting magnet. (5) A nuclear magnetic resonance apparatus characterized by using the superconducting magnet according to claim 4. (6) A first step of winding the superconducting coil around the winding frame, and arranging a flange on at least one end surface side of the upper and lower end surfaces of the superconducting coil wound in the first step, and connecting the winding frame and the superconducting coil with each other. a second step of integrating the flanges and impregnating them with a resin; and a third step of removing the winding frame after this second step and supporting the superconducting coil on a coil supporting member via the flanges with a plurality of bolts. A method for manufacturing a superconducting magnet, comprising the steps of: