JPS5959041A - Superconductive rotor - Google Patents

Abstract

PURPOSE:To improve the heat insulation of a superconductive rotor by forming a radiation heat radiation suppressing layer on the innermost radius surface of an ambient temperature damper shield for covering a superconductive coil, thereby reducing the radiation heat emitted from the shield into the interior. CONSTITUTION:The ambient temperature damper shield 1 of hollow cylindrical shape is formed of a highly conductive metal layer 1b and reinforced metal layers 1a, 1c. A radiation heat radiation suppressing layer 1d is formed on the bore side of the layer 1c. The layer 1d reduces the radiated heat emitted from the shield 1 to the interior and delays the radiation time of heat emitted abruptly from the layer 1b.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a superconducting rotor in which superconducting windings are covered by a magnetic damper shield formed by laminating and integrating a plurality of hollow cylinders.

[Technical background of the invention and its problems]

In a conventional super/iY conductive rotor, in order to cool one field winding to super r, an extremely low temperature coolant such as liquid helium is pumped into the rotor to cool it and perform IA. In order to store such extremely low-temperature refrigerant in the rotor and efficiently cool the field windings, the rotor has traditionally been equipped with a heat insulating layer made of a vacuum layer,
Reduction of conductive heat penetration due to the first modification of thin-walled structures,
In addition to heat countermeasures such as radiant heat shields that prevent the intrusion of radiant heat,
It has been practiced to discharge a refrigerant supplied in a liquid state (optionally containing gas) as a gas, and to utilize the heat of vaporization of the refrigerant to improve the cooling effect. In addition, two electromagnetic tambour shields, a room-temperature damper shield and a low-temperature damper shield, are provided to protect against fluctuations in the load applied from the d (Ikuko winding side), negative-phase four currents, high-frequency waves, etc. This is provided to prevent fluctuating magnetic fields from being applied to the superconducting field windings, to suppress the thin current loss that occurs in various parts due to fluctuating magnetic fields, and to dampen the mechanical vibration of the rotor. ing.

Figure 1 is a schematic cross-sectional view of a conventional superconducting rotor, in which a hollow cylindrical room-temperature damper shield (1) is made of copper, aluminum, or an alloy thereof.
b) and high mechanical strength (/? reinforcing layer made of gold metal (ta
, xc), and has a three-layer structure.

This room-temperature damper shield is located at the outermost part 1c of the rotor, and also serves as a vacuum container that encloses the entire rotor. The inner side of this room-temperature damper shield is provided with an A-air insulation layer flol and a radiant heat shield (2) to prevent heat from entering the inside. Radiant heat shields are often used as low-temperature damper shields (1)
It is cooled to a temperature of about 00°K (absolute temperature). Furthermore, in the inner rotor (4), an extremely low temperature liquid refrigerant (5) is stored, and is used to cool the superconducting field windings housed in the slots (6) provided in the inner rotor. ing. In Figure 1, (3) is the outermost diameter part of the cryogenic refrigerant container, (7) is the wedge with the liquid refrigerant passage, and (8a)
is a liquid refrigerant receiver, (8b) is a refrigerant receiving passage, and (9) is a liquid refrigerant passage.

The room temperature damper shield is located at the outermost diameter of the rotor, so a strong centrifugal force acts on it, and a strong d magnetic force acts on the highly conductive metal layer, so it has relatively weak mechanical strength. It has a multi-layered structure that is integrated with a high-strength support material that reinforces the durable metal. This high-strength support material is made of metals such as stainless steel, injonnel, titanium alloy, etc., and is sandwiched with a high-grade metal by a method such as explosion bonding or shrink fitting. Furthermore, Joule heat is generated in highly conductive metals due to C eddy currents when varying magnetic flux and rotor vibrations are attenuated, but this heat must be removed promptly. For this reason, cooling piping is provided in the room-temperature damper shield, and cooling gas is flowed around the rotor to remove heat from the outside diameter of the damper shield at room temperature.

In the conventional room-temperature damper shield of a superconducting rotor as described above, the highly conductive metal layer and the reinforcing metal layer are mechanically and thermally strongly integrated. Not only does heat radiate from the outer diameter side, but also the reinforcing metal layer on the inner diameter side has the disadvantage that radiant heat is easily propagated in the direction of the rotor interior V.

[Purpose of the invention]

The present invention was made in order to solve the above-mentioned drawbacks of the conventional superconducting rotor, and it reduces the radiant heat radiated inside from the room temperature damper rotor and creates a superconducting rotor with good heat insulation. The purpose is to provide.

[Summary of the invention]

In order to achieve the above object, the superconducting recirculator of the present invention is characterized in that a radiant heat radiation suppression layer is provided on the innermost surface of the room temperature damper shield.

Embodiment 6F An embodiment of the present invention is illustrated in Fig. 2.
FIG. 3 is a partial sectional view of the cold damper shield according to the present invention, and corresponds to the cold damper shield t1) of FIG. 1 showing the conventional structure. In FIG. 2, the electrically conductive metal layer (1b) is sandwiched between the reinforcing metal layer (1a) and the (IC). Further, a radiant heat radiation suppression layer (1d) is provided on the inner diameter side of the i11 strong metal layer (Ic). This radiant heat radiation suppression layer reduces the radiant Me radiated inward from the room temperature damper shield, temporally delays the heat radiation when heat is suddenly generated in the highly conductive metal layer, and also gradually slows down the heat radiation. It has the effect of This radiant heat radiation suppression layer (
is made of a combination of single materials such as materials with low thermal conductivity, materials with high heat capacity, and thin metal layers that reflect heat.The heat generated in the highly conductive metal layer is transferred to the inner diameter. The heat flowing towards the inside should be reduced by 1 degree as much as possible by using a material layer with low thermal conductivity and a heat reflecting layer. In this case, the radiation of radiant heat is delayed and buffered by the layer having a large heat capacity, and there is an effect of reducing the amount of time needed to respond to the cooling system.

In Figure 3, the reinforcing layer (1c) in Figure 2 is omitted, and the radiant heat radiation suppression layer has sufficient strength to support the metal layer (1b) on its outer periphery. in,
Since the suppression layer (1d) becomes thicker, the above-mentioned effect is enhanced. In addition, since the reinforcing layer is replaced with a high-strength radiant heat radiation suppression layer that is lighter in terms of density than the conventional metal reinforcement layer, centrifugal force is reduced and mechanical support is easier. There is. This centrifugal force reduction effect is very significant because the room temperature damper shield is located at the outermost diameter part of the rotor. In addition, the radiant heat radiation height fnIJ layer has a very high air resistance compared to a metal reinforcing layer, so the thinness and torrential flow caused by the fluctuating magnetic field from the core armature are reduced, and therefore, the generation of Joule loss is reduced. As a result, the heat radiation into the interior is further reduced by 1 degree.

The materials for the heat radiation suppression layer as described above include synthetic resin, glass fiber, and carbon fiber.

Synthetic resins reinforced with fibers such as metal fibers are preferred. This is because these fine reinforced synthetic resins have high strength.

This is because not only does C have characteristics such as low heat resistance, but it can also be manufactured by pasting it onto the inner surface of a hollow cylinder of a technical grade metal layer.

〔Effect of the invention〕

As described above, in the present invention, since the radiant heat radiation suppression layer is provided on the innermost surface of the laminated cylinder constituting the room temperature damper shield, the radiant heat radiated inside from the room temperature damper shield is reduced, and the heat insulation property is improved. I wish I could get a good superconducting rotor. Furthermore, by supporting the highly conductive metal layer with a high-strength radiant heat shield, centrifugal force is reduced, mechanical support is easy, and a superconducting rotor with good C1 heat insulation can be obtained.

[Brief explanation of drawings]

Figure 1 is a schematic cross-sectional view showing a conventional superconducting rotor, 2g
FIGS. 2 and 3 are partial cross-sectional views showing a room-temperature damper shield according to an embodiment of the present invention. 1 Room temperature damper shield la, lc Reinforcement layer 1 [) Highly conductive metal layer 1d ψ112 heat radiation suppression fi! I Jtl (7317) Agent Patent attorney Kensuke Chika (≧1 person) Figure 1 41J Figure 2/l)

Claims (4)

[Claims] (1) A superconducting rotor in which a superconducting winding is covered by a room-temperature damper shield constructed by stacking and integrating multiple hollow cylinders (a radiant heat radiation suppression layer is provided on the innermost surface of the room-temperature damper shield) A superconducting rotor characterized by: (2) A patent characterized in that the room-temperature Danbei shield has one noble layer, 1F'L, and β in the order of the outer diameter side, the reinforcing layer, the highly conductive metal layer, the reinforcing layer, and the radiant heat radiation suppression layer. A superconducting rotor according to claim 1. (3) Room-temperature dash bar shield has a reinforcing layer on the outer diameter side!
] The L4 tough metal layer is laminated in this order, and the radiant heat radiation suppression layer having sufficient strength to support the 14 high-conductivity gold layers is laminated in this order. Superconducting rotor. (4) Radiant heat radiation suppression A't is made of synthetic resin or synthetic resin reinforced with glass fibers, carbon fibers, metal fibers, etc. as set forth in claim 1. superconducting rotor.