JPH0218699Y2 - - Google Patents

Description

[Detailed description of the invention] "Technical field to which the invention pertains" This invention is a superconducting rotating structure in which a current lead for supplying current to a superconducting coil is passed through a spiral refrigerant duct of a spiral heat exchanger provided in a torque tube. Regarding rotors of electric machines.

"Prior art and its problems" FIG. 1 shows a conventional rotor.

A coil container 3 containing a superconducting coil 1 and liquid helium 2, which is a refrigerant for cooling the superconducting coil 1, is attached to both ends of a rotating vacuum container 5 via a torque tube 4.

A heat exchanger 6 is provided in the middle of the torque tube 4 to reduce heat entering the coil container 3.
A refrigerant gas that has cooled the superconducting coil 1 is passed through the heat exchanger 6 .

A current lead 7 for supplying current to the superconducting coil 1 is wired to the non-drive side shaft end 8 side through the inside of the duct of the heat exchanger 6, as will be described in detail later.

The flow path of helium, which is a refrigerant, is from the shaft end 8 on the non-drive side to the vacuum chamber 10 on the non-drive side through a liquid helium supply pipe 9 that is a piping along the center of the rotating shaft.
Here, it is branched into two and then supplied to the coil container 3.

Then, a part of the helium that has cooled the coil container 3 and the superconducting coil 1 is guided to the heat exchanger 6 by the heat exchanger tube inlet side 11, and passes through the heat exchanger pipe 12 through the spiral duct 12 provided in the heat exchanger 6. Exit side 13
and then returned to the non-drive side shaft portion 8.

A torque tube heat exchanger is also provided on the drive side of the superconducting rotor, and a part of the helium in the coil container 3 is also guided to this drive side heat exchanger, and is sent to the non-drive side through the heat exchange return pipe 14. It is returned to the shaft portion 8.

Here, the wiring route of the current lead 7 is from the coil container 3 to the inlet side heat exchanger tube 11 which also serves as lead piping.
and enters the helical duct 12 of the heat exchanger 6.

Then, it passes through the spiral duct 12 to reach the high temperature end of the heat exchanger 6, and from there the outlet side heat exchanger pipe 1
3 and reaches the non-drive side shaft portion 8.

The configuration of the duct 12 has a cross section shown in FIG.

The outer periphery of the heat exchanger 6 has a protrusion 6A having a comb-like cross section in a spiral shape, and the cylindrical lid member 20 that contacts the tip end surface of the protrusion 6A and covers the outer circumferential surface of the heat exchanger 6 spirally. A shaped refrigerant duct 12 is configured.

Inside the duct 12 are electrical insulators 100 and 101.
Buried along a spiral.

The insulators 100 and 101 are made of a flexible insulating material such as Teflon or rubber, and a first refrigerant flow path space 102 for heat exchange is formed between the inner peripheral side of the insulator 100 and the duct wall surface. A second coolant flow path space 103 is formed on the outer circumferential side thereof, which is covered with an insulator 101 and serves both to support the current lead 7 and as a cooling groove thereof.

Current lead 7 is lead 7A for going out to coil 1.
and the return path lead 7B are separated by an insulator 100 by a protrusion in the radial direction of the rotor and are spirally wound in a space 103.

With this configuration, the heat exchanger 6 is cooled by the refrigerant flowing through the first refrigerant flow path space 102,
In addition, the current leads 7A and 7B are connected to the refrigerant flow path space 1.
It is cooled by the refrigerant flowing through 03.

However, in such a configuration, the electrical insulator 10
Since the heat conduction of 0.0,101 is poor, the refrigerant contact surface is only the surface constituting the flow path space 102 when viewed from the heat exchanger 6, resulting in a problem of poor heat exchange efficiency.

Further, since the refrigerant flow path spaces 102 and 103 are separated by the insulator 100, there is a risk that the refrigerant flow rate will be uneven, and the current leads 7, 7A, and 7B may not be sufficiently cooled.

``Purpose of the invention'' This invention was made in view of the above-mentioned circumstances, and it is a rotor for a superconducting rotating electric machine that solves the problems of the conventional technology and ensures reliable cooling of the heat exchanger and current leads. The purpose is to provide.

``Key Points of the Invention'' The rotor of the superconducting rotating electric machine of this invention has a superconducting coil and a coil container for storing a refrigerant for cooling the superconducting coil provided inside a rotating vacuum container via a torque tube, and the circumferential surface of the torque tube A heat exchanger is provided with a spiral refrigerant duct formed by a spiral protrusion having a comb-like cross section and a cylindrical lid member that contacts the outer peripheral surface of the protrusion and covers the protrusion. A pipe is provided to return a part of the refrigerant gas evaporated in the refrigerant duct to the refrigerant supply/discharge device at the end of the shaft on the non-drive side, and a current lead of the superconducting coil is passed through the pipe and the refrigerant duct to the non-drive side. In the rotor of a superconducting rotating electric machine that is drawn out to the shaft end, a first refrigerant passage space and a third refrigerant are provided in the refrigerant duct on both left and right sides facing the refrigerant duct wall formed by the inner peripheral side and the projections. a first electrical insulator provided with a passage space and supporting the current lead on the outer circumferential side and provided with a second refrigerant passage space which is two grooves serving as a flow path for the refrigerant; A second electrical insulator is provided to cover the outer periphery of the electrical insulator, and the first electrical insulator communicates two grooves of the first refrigerant space and the second refrigerant passage space. By providing at least one refrigerant communication hole, the contact area of the refrigerant in the heat exchanger is increased, heat exchange efficiency is increased, and the deviation in the refrigerant flow rate is eliminated to ensure cooling of the current leads.

"Embodiment of the Present Invention" FIG. 3 is a sectional view of a main part showing an embodiment of the present invention.

The embodiment shown in FIG. 3 differs from the conventional embodiment shown in FIG. 2 in that an electrical insulator 110 is provided in place of the electrical insulator 100.

This electrical insulator 110 has a refrigerant passage space 103 formed between it and the insulator 101 on its outer periphery for supporting and cooling the current leads 7, 7A, 7B, and the duct surrounding the heat exchanger 6. A refrigerant flow path space 102 is formed between the surfaces.

In addition, the electrical insulator 110 has a third refrigerant passage space 104 formed on both sides facing the duct wall formed by the projections 6A, and a communication hole 105 that communicates the refrigerant passage spaces 102 and 103. They are formed at appropriate intervals along the spiral duct surface.

This refrigerant flow path space 104 and communication hole 105
As is clear from the perspective view shown in FIG. 4, the electrical insulator 110 has a refrigerant flow path facing the protrusion 6A, and the contact area between the heat exchanger 6 and the refrigerant is greatly improved. , significantly increases the heat exchange efficiency of the heat exchanger.

Further, an exchange of refrigerant occurs through the communication hole 105 between the refrigerant flowing on the current lead side and the heat exchange refrigerant, thereby eliminating deviations in the refrigerant flow rate and ensuring cooling of the current lead.

The embodiment shown in FIG. 4 shows a configuration in which the communication hole 105 reaches the top of the partition between the two grooves of the electrical insulator 110.

According to this configuration, it is possible to further eliminate unevenness in the refrigerant flow rate between the two grooves around which the current leads 7A and 7B are wound.
5 ensures sufficient alternating current between the heat exchange refrigerant flowing in the first space 102 and the current lead cooling refrigerant flowing in the second space 103 to eliminate deviations in the refrigerant flow rate and ensure cooling of the current leads. In order to do this, it is only necessary to reach the bottom surfaces of the two grooves in the electrical insulator 110.

Note that in the embodiment, the first space 102
By providing a communication hole similar to the communication hole 105 between the third space 104 and the third space 104, an alternating current path for the refrigerant flowing through both spaces can be formed, and unevenness in the refrigerant flow rate between the two spaces can be eliminated.

"Effects of the present invention" As described above, according to this invention, cooling channels for cooling the heat exchanger are provided not only on the inner periphery of the electrical insulator but also on both sides, and the first refrigerant channel and the second The structure has a refrigerant communication hole that communicates with the refrigerant flow path, which improves the heat exchange efficiency of the heat exchanger and eliminates unevenness in the refrigerant flow rate between each refrigerant flow path, resulting in reliable cooling. be.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing the rotor of a conventional superconducting rotating electric machine, FIG. 2 is a cross-sectional view of the heat exchange section in FIG. 1, and FIG. Figure 4 shows the electrical insulator 11 in Figure 3.
FIG. 6: Heat exchanger, 7, 7A, 7B: Current lead,
20: Lid member, 100, 101: Electrical insulator, 1
02, 103, 104: Refrigerant flow path space, 10
5: Refrigerant communication hole, 110: Electrical insulator.

Claims (1)

[Scope of utility model registration request] A coil container 3 for storing a superconducting coil 1 and a refrigerant 2 for cooling the superconducting coil 1 is provided inside a rotating vacuum container 5 via a torque tube 4, and a spiral comb-shaped cross section is provided on the circumferential surface of the torque tube 4. A heat exchanger 6 including a spiral refrigerant duct 12 formed by a shaped projection 6A and a cylindrical lid member 20 that contacts the outer peripheral surface of the projection 6A and covers the projection 6A.
pipes 11 and 13 for returning a part of the refrigerant gas evaporated in the coil container 3 to the refrigerant supply and discharge device side of the non-drive side shaft end 8 through the refrigerant duct 12 are provided, and current leads of the superconducting coil 1 are provided. In a rotor of a superconducting rotating electrical machine in which a superconducting rotor 7 is drawn out through the pipes 11, 13 and the refrigerant duct 12 to the non-drive side shaft end 8, a rotor is formed in the refrigerant duct 12 on the inner peripheral side and on the protrusion 6A. A first refrigerant passage space 10 is provided on both left and right sides facing the refrigerant duct wall.
The first refrigerant passage space 104 is provided with second and third refrigerant passage spaces 104 to support the current lead 7 on the outer peripheral side, and is provided with a second refrigerant passage space 103 which is two grooves that serve as flow paths for the refrigerant 2. an electrical insulator 110 and a second electrical insulator 101 covering the outer periphery of the first electrical insulator 110; 102 and the second refrigerant passage space 1
A rotor for a superconducting rotating electric machine, characterized in that at least one refrigerant communication hole 105 is provided that communicates with the two grooves of 03.