JPH04122003A - Superconductive coil device - Google Patents

Abstract

PURPOSE:To dramatically reduce heat penetration into an inner chamber and prevent resonance within the inner chamber by connecting the inner chamber to the outer chamber with a supplementary load supporter that is freely detachable separately from the main load supporter. CONSTITUTION:A superconductive coil 1 and a cooling fluid 2 are stored in an inner chamber 3 which is placed inside an outer chamber 4 maintaining a vacuum environment. In addition to the main supporter that attaches the chamber 3 to the chamber 4, a hollow, loop heat shield frame 5 that encircles the chamber 3, coupling materials 91-93, and a supplementary load supporter 8 that can be freely attached and removed between the opposing surfaces of the inner and outer chambers are established. These elements make it possible to reduce heat penetration into the inner chamber and prevent resonance within the inner chamber.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] This invention relates to a superconducting coil device that conducts electricity at extremely low temperatures using liquid helium or the like.0 [Prior Art] Fig. 3 and 1g45? For example, Utsukai Sho 61-9809
This is a diagram showing a conventional superconducting coil device of this kind described in the above publication. In the figure, 1 is a superconducting coil housed in a stainless steel annular inner tank 3 together with liquid helium 2, which is a liquid refrigerant; An outer tank that maintains a vacuum inside, 5
is arranged in a vacuum space between the inner tank 3 and the outer tank 4 so as to surround the inner tank 3, and is cooled by a pipe (not shown) through which liquid nitrogen flows, and radiation from the outer tank 4 to the inner tank 3 is provided. Two aluminum heat shield plates 6 are arranged at intervals in the longitudinal direction of the inner tank 3 so as to penetrate through the annular inner tank 3, and are welded between the inner walls of the outer tank 4. A cylindrical outer tank connecting rod 71 is a first main load supporting member that fastens and fixes the heat shield plate 5 to the outer tank connecting rod 6, and 72 is a support for the inner tank 3 and the first main load. It is a second load supporting member that is connected to the member 71 and supports the inner tank 3.

[Problem to be solved by the invention]

In this conventional device, when the device starts operating, the inner tank is vibrated at a frequency in the left and right direction, that is, in the F direction, from an external coil (not shown), and when it is excessively vibrated, especially in a resonance state, the superconducting coil quenches. There was a problem of superconductor destruction. Therefore, we are reconsidering the multi-device system by increasing the number of main load supporting members, but it is also a good idea not to increase the number of main load supporting members unnecessarily as it is necessary to suppress the intrusion of heat into the inner tank. , the effect of reducing the excitation acceleration was small.

This invention was made to solve these conventional problems, and aims to reduce the vibration acceleration of the inner tank, prevent quenching of the superconducting coil due to vibration, and obtain a highly reliable superconducting coil device. With the goal.

[Failure to solve the problem]

A superconducting coil device according to the present invention includes an annular inner tank that stores a superconducting coil and a liquid refrigerant in an outer tank whose interior is vacuumed, and a ring-shaped inner tank that stores a superconducting coil and a liquid refrigerant. In the case where the inner tank and heat shield plate are supported by the main load supporting member on the outer tank connecting rod attached between the opposing faces of the inner tank and the outer tank, the auxiliary load supporting member can be attached and removed between the opposing faces of the inner tank and the outer tank. It can be installed freely.

[Effect]

Since the auxiliary load support member of the present invention connects the inner tank to the outer tank separately from the main load support member, it is possible to suppress the resonance phenomenon of the inner tank in the coil housing portion caused by the excitation force acting on the inner tank. I can do it.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

That is, in FIGS. 1 and 2, 8 indicates that the inner tank 3 is connected to the outer tank 4.
Auxiliary load supporting members are detachably attached to the connecting members 91, 92, and 93, and l○1 and 102 are connecting members 92 and 93, and vacuum holding members arranged between the connecting members 93 and the outer tank 4. 11 is a thermal anchor that connects the heat shield plate 5 to the auxiliary load supporting member 8. Here, a plurality of auxiliary support members 8 are arranged approximately on one center of the inner tank 3. Note that the other configurations are the same as those of the conventional device shown in FIGS. 3 and 4, and therefore the description thereof will be omitted.

With such a configuration, when the inner tank 3 housing the superconducting coils is vibrated in the F direction from an external coil (not shown), the spring constants, positions, and number of the main load supporting members 71 and 72 and the inner tank Depending on the rigidity, etc., a resonance state occurs at a certain frequency. In the case of a superconducting coil device, the frequency during normal operation varies over a wide range of about 0-400 Hz, so it is difficult to avoid resonance in the inner tank with only the main load supporting members 71 and 72, but the auxiliary load Since the support member 8 is attached above the center of the coil of the inner tank 3, the span from the load application point to the support point approaches 0, and the resonance phenomenon in the frequency range from 0 to 400 Hz is suppressed.

On the other hand, in order to suppress the intrusion of heat into the inner tank 3, it is desirable to reduce the number of attachment points for the auxiliary load support member 8 as much as possible, but which part of the inner tank should be auxiliary supported will prevent the superconducting coil from quenching. There are many cases where vibration acceleration comparisons and simulations do not clearly show this. Therefore, all the attachment points of the auxiliary load support member 8 are designed to be removable so that the auxiliary load support member 8 that does not contribute to performance improvement can be removed to reduce heat intrusion into the inner tank. There is.

〔Effect of the invention〕

As mentioned above, in the superconducting coil device according to the present invention, the inner tank is connected to the outer tank by the auxiliary load support member that is detachable from the main load support member, so that the intrusion of heat into the inner tank is minimized. Therefore, the resonance phenomenon of the inner tank can be suppressed, and the reliability of the device is improved.

[Brief explanation of drawings]

FIG. 1 and FIG. 2 are diagrams showing one embodiment of this invention,
Figure 1 is an enlarged sectional view of Figure 2 (1=I line), Figure 2 is a side view,
Figures 3 and 4 are diagrams showing a conventional superconducting coil device of this type, with Figure 3 being a side view and Figure 4 being Figure 3ff-IV.
FIG. In the figure, 1 is a superconducting coil, 2 is liquid helium, 3 is an inner tank, 4 is an outer tank, 5 is a heat shield plate, 6 is an outer tank connecting rod, 7
1 and 72 are main load supporting members, 8 is an auxiliary load supporting member,
91, 92, and 93 are connecting members. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims] an outer tank that maintains a vacuum inside; an annular inner tank that is disposed within the outer tank and houses a superconducting coil and a liquid refrigerant;
A hollow annular heat shield plate that surrounds the inner tank, an outer tank connecting rod that is installed and fixed between opposing surfaces of the outer tank, and a connecting rod that engages with the outer tank connecting rod and connects the inner tank and the heat shield plate. A superconducting coil device comprising a main load support member that supports the main load support member, and an auxiliary load support member that is detachably attached between the opposing surfaces of the inner tank and the outer tank.