JPS6010498B2 - superconducting rotor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a superconducting rotor that cools superconducting field windings with a cooling liquid such as liquid helium.

FIG. 1 is a vertical sectional side view showing the schematic structure of a conventional superconducting rotor of this type. A cooling liquid 1 such as liquid helium is injected from the outside of the superconducting rotor 2 into the torque tube 3 as shown by solid arrows, and is passed through a large number of radial through holes 4 provided in the torque tube 3 into the torque tube. 3 and the inner damper 5.
etc. to cool down.

Since this cooling liquid 1 does not completely fill the space inside the torque tube 3, that is, the internal chamber 7, the centrifugal force caused by the rotation of the superconducting rotor 2 causes the cooling liquid 1 to be applied to the inner wall 8 of the torque tube 3 in the same manner as the torque tube 3. 0, and a liquid free surface 9 is formed. Note that a part of the cooling liquid 1 becomes paper due to the heat of the superconducting field winding 6 and the like, and is discharged to the outside of the superconducting rotor 2 as shown by dotted arrows. Figure 2 shows the ratio a/b between the radius (liquid outer diameter) a of the torque tube inner wall 8 and the radius (liquid inner diameter) b of the liquid free surface 9 during rotation of the superconducting rotor 2, and the ratio a/b of the radius (liquid inner diameter) of the torque tube inner wall 8 when the superconducting rotor 2 is rotating. Dangerous speed if not.

The value obtained by dividing the rotational speed of the superconducting rotor 2 by ○/. FIG. In this Figure 2, the dot-dashed line indicates the critical speed when liquid 1 is contained, which is generally .

It is. Further, between the two solid lines, a diagonally shaded region U' of rotational speed Q/o indicates a rotational speed range in which unstable vibration similar to the behavior of the liquid 1 occurs. Superconducting rotor 2
When rotates in this unstable region U, the liquid free surface 9 no longer has the same D-shape as it rotates, and an unbalanced force due to the liquid 1 acts on the torque tube inner wall 8. Moreover, as this unbalanced force increases with time, the vibration amplitude of the superconducting rotor 2 increases, resulting in a very dangerous situation, and eventually leading to a serious situation of damage. SUMMARY OF THE INVENTION An object of the present invention is to solve the problems of the prior art described above, to prevent the occurrence of unstable vibrations, and to provide a superconducting rotor that can be rotated quietly and stably.

To achieve this object, the present invention provides a torque tube with a hollow ring-shaped immersion member immersed in a cooling liquid with its outer circumferential side forming a free surface and its inner circumferential side is exposed from the free surface, and the immersed portion of the immersion groove member brings the free surface of the cooling liquid closer to the rotation axis side of the torque tube, and the exposed portion of the immersion member extends the free surface of the cooling liquid in plurality. It is characterized by being divided into

Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 3 to 5. A torque tube 3 having a large number of through holes 4 is attached in the same D shape as the outer damper 14 inside the outer damper 14 whose both ends are supported by the drive shaft 10 and supply/discharge shaft 11 via end plates 12 and 13, respectively. It is being

An inner damper 5 is attached to the outside of the torque tube 3 in the same D shape as the torque tube 3, and a superconducting field is formed in the field winding chamber 15 formed by the torque tube 3 and the inner damper 5. A magnetic winding 6 is housed, and is attached and supported by the torque tube 3. Partition plates 16 and 17 are fixed near both ends of the torque tube 3, respectively, and end chambers 18 and 19 are constituted by the partition plates 16 and 17, the torque tube 3, and the end plates 12 and 13. Further, in the internal chamber 7, an inner cylinder 20 and an outer cylinder 21 are attached to partition plates 16 and 17 so as to have the same D shape as the torque tube 3, and these cylinders 20
, 21 are provided with through holes 22 and 23, respectively, and these through holes 22 and 23 are connected by a pipe 24.

The pipe 24 is arranged symmetrically with respect to the rotation axis as shown in FIG. An injection pipe 25 for injecting cooling liquid 1 such as liquid helium is attached to the hollow supply shaft 11 in the same shape as this, and this injection pipe 25 is connected to the partition plate 17.
A discharge device 27 is provided at the distal end of the discharge device 27 to extend through the inner cylindrical chamber 26 and discharge the liquid 1 radially.

Note that this discharge device 27 passes through the inner cylinder 20 and the outer cylinder 21, and its discharge port 28 closes into an intermediate chamber 29 formed between the torque tube 3 and the outer cylinder 21. The partition plate 16 on the drive ball side is provided with a through hole 30 through which the inner cylindrical chamber 26 and the end chamber 18 are connected.
As shown in FIG. 5, the partition plate 17 on the first side has a through hole 31 through which the inner cylindrical chamber 26 and the end chamber 19 communicate.
A plurality of them are provided symmetrically with respect to 5.

Further, the torque tube 3 is provided with a through hole 33 that connects the end chambers 18 and 19 and the external chamber 32, and the end chamber 19 on the side of the feeding shaft E-shaft 11 is provided with a gas such as helium in the feeding shaft E-shaft 11. The passage 34 and through hole 35 for leading out the lotus are suitable for the lotus. Therefore, the end chamber 18 on the drive shaft 10 side is the external chamber 3.
2 and the end chamber 19 on the supply/discharge shaft 11 side are connected to the gas outlet passage 34. In addition, 36 and 37 are the drive shaft 10
and a bearing that supports the allowance E shaft 11. In the superconducting rotor 2 configured as described above, the liquid 1 is supplied from the outside.
The paper is injected into the intermediate chamber 29 via the injection pipe 25 and the discharge device 27 as shown by the solid arrow.

Then, the superconducting rotor 2 is rotated, and its speed increases to a relationship of r/g (r: outer diameter of the outer cylinder 21, n: rotational angular velocity of the superconducting rotor, -g: acceleration of gravity). At this time, liquid 1 is similarly injected in place of the previously injected paper. The liquid 1 is biased toward the inner wall 8 of the torque tube due to centrifugal force, and flows into the field winding chamber 15 through the through hole 4 .

Even if the field winding chamber 15 and the intermediate chamber 29 are filled with the liquid 1, the liquid 1 may be further injected under pressure until the surface 9 of the liquid 1 reaches the pipe 24 or a small amount of liquid 1 is inside the inner cylinder 26. Let liquid 1 enter. At this time, a portion of the liquid 1 enters and leaves the field winding chamber 15 through the through hole 4 provided in the torque tube 3 to cool the superconducting field winding 6.
The temperature of the liquid 1 that has cooled the superconducting field windings 6 and the like rises, and a portion thereof becomes paper or gas, floats to the surface of the liquid, or evaporates from the surface of the liquid. This paper or gas collects in the inner cylindrical chamber 26 and passes through the partition plate through hole 30, the end chamber 18, the torque tube through hole 33, the outer chamber 32, the torque tube through hole 33, and the end chamber 19 in the direction shown by the dotted arrow. The gas flows through the superconducting rotor 2 and is discharged to the outside from the supply/exhaust shaft gas outlet passage 34 while cooling the inside of the superconducting rotor 2 .

Note that the liquid 1 corresponding to the amount of the discharged gas is injected from the outside through the injection pipe 25, so that the amount of the liquid 1 inside the torque tube 3 is always kept constant. In addition, when stopping the rotation of the superconducting rotor 2, negative pressure is applied so that the liquid 1 flows in the direction opposite to the solid arrow.
, the liquid 1 in the pipe 24 and a part of the liquid 1 in the intermediate chamber 29 are discharged to the outside of the superconducting rotor 2.

Next, the superconducting rotor 2 is operated at a rotation speed that satisfies 2>g of r until the residual liquid inside the superconducting rotor 2 is vaporized, and then the rotation is stopped. Alternatively, gas having a temperature higher than the temperature of the liquid 1 is sent from the injection pipe 25 into the intermediate chamber 29 during operation at the above-mentioned rotation speed to promote vaporization of the liquid 1. By such a method of injecting and discharging the liquid 1, unbalanced vibrations due to thermal deformation of the superconducting rotor 2 due to the deviation of the liquid 1 can be prevented.

According to this embodiment, the liquid 1 inside the superconducting rotating body 2
Since the free surface 9 of the liquid 1 is located inside the pipe 24, it is significantly reduced, preventing the occurrence of unstable vibrations of the superconducting rotor 2 due to the behavior of the free surface of the liquid 1, and reducing the range in which unstable vibrations occur. I can do it.

As a result, it becomes possible to rotate the superconducting rotor 2 stably and quietly. FIG. 6 shows another embodiment of the invention.

In this example, one end of the injection pipe 25 extends to near the center of the superconducting rotor 2, and the pond end of the injection pipe 25 is cooled via a coupling 38 that connects the stationary side cold soot passage and the rotating side cold soot passage. A supply/discharge device 39 for supplying and discharging women
is installed.

Therefore, the thermal convection related to the cooling effect of the liquid 'injected from the discharge port 28 of the discharge device 27 is symmetrical with respect to the superconducting rotor 2, and the heat convection is symmetrical with respect to the superconducting rotor 2, compared to the case of FIG. 3 in which the liquid 1 is injected from the end. Unbalanced vibrations caused by deformation can be reduced. Further, FIG. 7 shows still another embodiment of the present invention.

In this embodiment, a plurality of hollow rings 40 arranged side by side with increasing intervals in the axial direction are immersed in the liquid 1 with the inner circumference side exposed to the free surface 9, and the mounting It is fixed to the torque tube 3 via 41.

Therefore, by immersing the hollow ring 40 into the liquid 1, the free surface 9 of the liquid 1 can be brought closer to the rotation axis side and reduced, and the capacity of the liquid 1 inside the superconducting rotor 2 can be reduced. As a result, unstable vibrations and unbalance vibrations caused by the behavior of the free surface of the liquid 1 can be prevented.

In addition, since the inner peripheral side portion of the hollow ring 40 is exposed on the free surface 9 of the liquid 10, and the free surface 9 of the liquid 1 is thereby divided from each other in the axial direction, instability caused by the free surface can be avoided. Vibration is further effectively prevented. As explained above, according to the present invention, since the outer peripheral side of the hollow ring-shaped immersion part village is immersed in the cooling liquid injected into the torque tube and forming the free surface, cooling The free surface of the liquid can be brought closer to the axis of rotation of the torque tube to reduce this free surface, and the volume of cooling liquid can be reduced to reduce the amount of unbalance.
Unstable vibrations and unbalanced vibrations caused by the free surface of the cooling liquid can be prevented.

In addition, the inner circumferential portion of the bonding member is exposed from the free surface of the cooling liquid, and this exposed portion divides the free surface of the cooling liquid into multiple sections, which further effectively prevents unstable vibrations caused by the free surface. can do. As a result, the superconducting rotor can be rotated quietly and stably.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional side view showing the schematic structure of a conventional superconducting rotor, Fig. 2 is a characteristic diagram showing the state of the internal liquid and the region where unstable vibrations occur with respect to the rotation speed, and Fig. 3 is an embodiment of the present invention. A vertical side view showing a schematic structure of a superconducting rotor according to an example, FIG. 4 is a sectional view taken along the line X-X in FIG. 3, FIG. FIG. 7 is a longitudinal sectional side view showing a schematic structure of a superconducting rotor according to other embodiments of the present invention. 1...Cooling liquid, 2...Superconducting rotor 3...Torque tube, 5...Inner damper, 6...Superconducting field winding , 14...Outer damper, 20...Inner cylinder, 21...
-Outer cylinder, 24...pipe, 40...hollow ring. Sunosu Z Style 3 Sesumu Mouse S Bacterial Juice 6 Anti-Phantom 7 Diagram

Claims (1)

[Claims] 1. A cylindrical torque tube, a superconducting field winding attached to the outer circumference of the torque tube, and cooling for cooling the superconducting field winding injected into the torque tube. In the superconducting rotor, the cooling liquid is biased toward the inner wall of the torque tube due to centrifugal force during rotation to form a free surface on the inner circumferential side of the superconducting rotor. A hollow ring-shaped immersion member is provided in such a manner that its outer circumference side part is immersed in the cooling liquid forming a free surface, and its inner circumference side part is exposed from the free surface, and the immersion member is immersed. A superconducting rotor, characterized in that the free surface of the cooling liquid is brought closer to the rotation axis side of the torque tube at a portion thereof, and the free surface of the cooling liquid is divided into a plurality of portions at an exposed portion of the immersion member. 2. In claim 1, the immersion member:
A superconducting rotor comprising an inner cylinder, an outer cylinder, and a passage connecting these.