JPH027274B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a superconducting rotor that includes a cylindrical liquid refrigerant storage tank on a rotating shaft.

FIG. 1 shows an example of a conventional superconducting rotor. 1 is a superconducting winding, 2 is a rotor containing the superconducting winding 1, 3 is a drive shaft for rotating the superconducting winding, 4 is a supply pipe for supplying a refrigerant to cool the superconducting winding, and 5 is a discharge path thereof. A cylindrical partition wall 6 supports the superconducting winding 1 and also serves as a liquid refrigerant storage tank for the rotor 2 . Inside the partition wall 6, liquid helium 7 as a refrigerant is located on the outer diameter side due to rotational centrifugal force, and gaseous helium 8 is located on the inner diameter side. Further, a communication hole 10 is formed in the partition wall 6 as an inlet/outlet for a coolant for cooling the superconducting winding 1.

In such a configuration, when the rotor rotates at a relatively low speed in the direction of arrow 9, liquid helium 7
It was inferred from experiments using other fluids that the liquid surface of the liquid would be as shown in Figure 2. In other words, the liquid level in the horizontal rotating cylinder gathers downward due to gravity, and a portion is dragged by the partition wall 6 and sticks to the inner circumferential side thereof. As a result, as shown in the figure,
There may be cases where the liquid does not reach a part of the partition wall 6.
That is, a situation occurs in which no refrigerant is supplied to the superconducting winding 1.

The present invention has been made in order to eliminate the above-mentioned problems, and includes arranging an auxiliary wall with a large number of small holes in the liquid refrigerant storage tank so that the liquid rotates along with the auxiliary wall. This is what I did. That is, it includes a rotor provided on a rotating shaft, a partition partitioning the inside of the rotor into concentric circles around the rotating shaft over the entire length in the axial direction, and a superconducting winding built in between the outside of the partition and the inside of the rotor, A liquid refrigerant storage tank is formed on the entire inner circumference of the partition wall, and the liquid refrigerant supplied to the liquid refrigerant storage tank flows into and flows into the superconducting winding side through holes in the partition wall to cool the winding. In the superconducting rotor, an auxiliary wall provided with a large number of small holes inside the partition wall is formed in a radial or concentric cylindrical shape, and its axial length is A plurality of walls are arranged so as to cover the entire length of the partition wall in the axial direction. Therefore, the free surface of the liquid extends over the entire axial length of the liquid refrigerant storage tank, and since the radial or concentric walls drag the liquid, the entire inner circumference of the partition wall is wetted by the liquid.

An embodiment of the superconducting rotor of the present invention will be described below with reference to FIG.

FIG. 3 is a partial sectional view of a liquid refrigerant storage tank in an embodiment of the superconducting rotor of the present invention. A radial wall 11 is arranged as an auxiliary wall inside the partition wall 6 constituting the liquid refrigerant storage tank, and small holes 12 are provided to ensure fluid circulation. In such a structure, the liquid helium 7 rotates and the radial wall 1
The gas helium 8 is dragged by viscosity and rotates almost as one on the outer diameter side of the partition wall 6, and the gaseous helium 8 is located on the inner diameter side.

FIG. 4 is a partial sectional view of a liquid refrigerant storage tank in another example of the superconducting rotor of the present invention. In this example, instead of the radial plate 11 of the example shown in FIG. 3, a plurality of cylindrical walls 13 provided with a large number of small holes are arranged concentrically. Even in this case, the same effect as in FIG. 3 can be obtained.

In FIGS. 3 and 4, the number of plates is increased to the extent that they can rotate together with the liquid.

As explained above, according to the present invention, the liquid level in the liquid refrigerant storage tank forms a substantially concentric circle even during low speed rotation, making it possible to constantly supply liquid refrigerant to the entire area of the superconducting winding.

[Brief explanation of drawings]

FIG. 1 is a side sectional view showing an example of a conventional superconducting rotor, FIG. 2 is a partial front sectional view of the liquid refrigerant storage tank of the structure shown in FIG. 1 during rotation, and FIGS. 3 and 4 are according to the present invention. FIG. 2 is a partial cross-sectional view of a liquid refrigerant storage tank of an embodiment of a superconducting rotor. 1... Superconducting winding, 2... Rotor, 6... Partition wall, 7... Liquid helium, 8... Gas helium,
11...radial wall, 12...small hole, 13...cylindrical wall.

Claims (1)

[Claims] 1. A rotor provided on a rotating shaft, a partition partitioning the inside of the rotor into concentric circles around the rotating shaft over the entire length in the axial direction, and a superconducting winding built in between the outside of the partition and the inside of the rotor, A liquid refrigerant storage tank is formed on the entire inner circumference of the partition wall, and the liquid refrigerant supplied to the liquid refrigerant storage tank flows into and flows into the superconducting winding side through holes in the partition wall to cool the winding. The superconducting rotor is characterized in that a plurality of auxiliary walls having a large number of small holes inside the partition wall are arranged in a radial or concentric cylindrical shape, and the axial length thereof covers the entire axial length of the partition wall. A superconducting rotor.