JPS63305747A - Rotor for superconducting rotary machine - Google Patents

Abstract

PURPOSE:To simplify the cooling structure of a superconducting magnetic field coil while enhancing stability in cooling, by cooling the end part of a heat transmitting member, which is brought into contact with the superconducting magnetic field coil, while providing a fluid reservoir, which stores liquefied gas, adjacent to the coil. CONSTITUTION:Heat transmitting member 8 is provided in a cylinder 7 in which a superconducting field coil 1 is built, and one end of the heat transmitting member 8 is brought into thermal contact with the superconducting field coil 1. The other end of the heat transmitting member 8 is protruded from an end part shaft 4 of the cylinder 7, forming a protruding part 9. The superconducting magnetic field coil 1 is indirectly cooled by cooling said protruding part. Further a fluid reservoir 14, which stores liquefied gas 16, is provided adjacent to the field coil 1, and a communication pipe 15 holds a pressure in the fluid reservoir 14 to a fixed level. A thermal load change of the superconducting field coil 1 is absorbed by the latent heat of vaporization of the liquefied gas 16. In this way, stability of cooling can be enhanced.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention relates to a rotor for a rotating machine such as a superconducting generator (hereinafter referred to as a superconducting rotor), and particularly relates to an improvement in the cooling method of a superconducting field coil. It is something.

[Conventional technology]

FIG. 2 is a sectional view showing the internal structure of the superconducting rotor of the prior application. In the figure, (1) is a superconducting field coil, (
2) is the coil mounting shaft that fixes this superconducting field coil;
(3) is the end shaft A on the drive side, +41 is the end shaft B on the non-drive side, +61 is the torque tube A composed of a thin cylinder that relays the end shaft A (3) and one end of the coil mounting shaft, +6
1 is a torque tube B similarly provided on the non-drive side.

(7) is a cylinder provided on the outer circumferential side of the superconducting field coil (1), coil mounting shaft (2), and torque tubes A (5) and B (6) to house them, and both ends of this cylinder are The end shafts A and B (31, +4) are integrally joined to each other by, for example, welding to form a heat insulating vacuum part S. One end of (8) is in thermal contact with the superconducting field coil +11 via the coil mounting shaft (2), and the other end extends from the vacuum section S through the end shaft (4) and projects outside the vacuum section. A plurality of rod-shaped heat transfer members having good thermal conductivity, such as steel or aluminum, are inserted into holes provided at appropriate locations on the coil mounting shaft (2). (9) This is a protruding portion of the heat transfer member (8), and is provided with heat radiation fins to enhance heat exchange performance.

(lα is a vacuum insulation joint for heat insulation provided to thermally separate the heat transfer member (8) and the end shaft (4).

(!l) is the current lead for energizing the superconducting field coil +11, [+21 and α31 are the end shafts A #
Bearings A and B support a 131 # +41. Note that a slip ring is provided at the end of the end shaft B (4) to conduct electricity from the stationary part to the current lead (11) of the rotating part.
It is omitted here. In addition, the protrusion (9) of the heat transfer member (8)
) is provided with suitable insulation means, but not shown here.

The superconducting rotor constructed as described above is cooled as follows. The protrusion (9) of the heat transfer member (8) is cooled and maintained at a constant temperature by a refrigerant such as low-temperature liquefied gas. At this time, the heat of the superconducting field coil il+ (those received from the surroundings and those due to self-heating) are taken away by the refrigerant from the coil attachment shaft (21) via the heat transfer member (8).

The superconducting field coil (1) is cooled and maintained at the refrigerant temperature by configuring a heat transfer path with sufficiently low thermal resistance against the heat load of the superconducting field coil 11) and the coil mounting shaft (2). .

[Problem that the invention seeks to solve]

Conventional superconducting rotors are configured as described above, so when there is an abnormal heat load that suddenly occurs, it is necessary to quickly remove this and keep the superconducting field coil cooled to below the desired temperature. -, the cross-sectional area of the heat transfer member must be increased; conversely, if there are restrictions on the dimensions of the rotor, the cross-sectional area of the heat transfer member may not be sufficient, leading to problems such as temperature rise due to heat load fluctuations. This invention was made to solve the above-mentioned problems, and is a heat exchanger using a refrigerant in the superconducting field coil.
The objective is to provide a highly reliable superconducting rotor that can be stably cooled by providing a sink to absorb heat caused by temporary load fluctuations.

[Means for solving problems]

A rotor of a superconducting rotating machine according to the present invention includes a cylinder, an end shaft provided at both ends of the cylinder and forming a vacuum section in the cylinder, and adiabatically supported by the end shaft to form the vacuum section. a heat transfer member, one of which is in thermal contact with the superconducting field coil and the other of which extends from the vacuum section through the end shaft and projects out of the vacuum section;
A liquid reservoir provided in thermal contact with the superconducting field coil to store liquefied gas, a communication pipe communicating the liquid reservoir with the outside and keeping the pressure of the liquid reservoir constant, the heat transfer member The superconducting field coil is cooled by cooling the protrusion of the superconducting field coil, and variations in the thermal load of the superconducting field coil are absorbed by the latent heat of vaporization of the liquefied gas.

[Effect]

The heat transfer member according to the present invention constantly cools the superconducting field coil, and the liquefied gas stored in the liquid reservoir absorbs sudden heat load fluctuations of the superconducting field coil, so it has excellent cooling stability. A rotor for a highly reliable superconducting rotating machine can be obtained.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. j1
! In Figure 1, α41t;j, superconducting field coil +1
In this example, it is integrated with the coil mounting plate (8) and is provided so as to form an annular space on the inner circumferential side of the heat transfer member (8). 0
υ is a communication pipe that maintains the pressure of the liquid reservoir (14) constant,
The liquid reservoir (14) passes through the center shaft of the end shaft B (4),
It communicates with, for example, a buffer tank (not shown) that can be controlled to a constant pressure via a rotating shaft seal (not shown). Six wheels are liquefied gas stored in the liquid reservoir 041.

In the superconducting rotor configured as described above, the superconducting field coil fll is cooled as follows.

Similar to the conventional one, the heat of the superconducting field coil fi1 is released from the heat dissipation fins of the protrusion (9) via the heat transfer member (8) as a low-temperature liquefied gas that is a refrigerant. Here, when using the liquefied gas aφ in the liquid reservoir H at a liquefaction point that is the same as or slightly below the cooling temperature of the protrusion (9), the cooling capacity is lower than the thermal load of the superconducting field coil Tl+. If there is enough room, the vaporized liquefied gas (16) is liquefied by excess cooling, and a certain amount is stored in the liquid reservoir (14).On the other hand, due to thermal disturbance, the superconducting field coil fl+ is temporarily turned off. When the heat load of the part to be cooled exceeds the cooling capacity of the heat transfer member (8), it can be absorbed by the latent heat of vaporization of the liquefied gas αe stored in the liquid reservoir (14).
When the inside of the liquid reservoir is maintained at a constant pressure by allowing Iφ to freely enter and exit through the communication pipe (161), the superconducting field coil (1) can be cooled and maintained at a constant temperature even when the heat load fluctuates. , it is possible to exhibit the desired performance.Therefore, a heat buffer function is obtained by the evaporation-liquefaction of the liquefied gas (+61) in the liquid reservoir (+4).

In the above embodiment, the liquid reservoir Q4) is connected to the superconducting field coil i.
It was installed inside the coil mounting shaft (2) that fixes l+, but
A similar effect can be obtained even if it is provided outside the superconducting field coil 11+.

Of course, a structure in which the superconducting field coil fil is installed in the liquid reservoir 04) may also be used; in this case, the liquefied gas (1
61 liquid immersion cooling can be performed, and the cooling characteristics can be further improved.

〔Effect of the invention〕

As described above, according to the present invention, there is a cylinder, an end shaft provided at each end of the cylinder and forming a vacuum section within the cylinder, and adiabatically supported by the end shaft and disposed in the vacuum section. a superconducting field coil, one of which is in thermal contact with the superconducting field coil, and the other of which is a heat transfer member that extends from the vacuum section through the end shaft and projects out of the vacuum section, and the superconducting field coil. A liquid reservoir provided in thermal contact with the coil to store liquefied gas, a communication pipe communicating this liquid reservoir with the outside and keeping the pressure of the liquid reservoir constant, and a protrusion of the heat transfer member. By cooling, the superconducting field coil is cooled, and fluctuations in the thermal load of the superconducting field coil are absorbed by the latent heat of vaporization of the liquefied gas, resulting in a highly reliable superconductor with excellent cooling stability. 0 which has the effect of obtaining the rotor of a rotating machine

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a rotor of a superconducting rotating machine according to an embodiment of the present invention, and FIG. 2 is a sectional view showing a rotor of a previous superconducting rotating machine. In the figure, (l) is the superconducting field coil, (2) is the coil mounting shaft, f3), I+) is the end shaft, (7) is the cylinder, (8) is the heat transfer member, and (9) is the heat transfer member. The protruding parts of the members, ■ are the liquid reservoir, 0ω is the communication pipe, and (+6) is the liquefied gas. 3. In each figure, the same reference numerals indicate the same or corresponding parts.

Claims (2)

[Claims] (1) a cylinder, an end shaft provided at each end of the cylinder to form a vacuum section within the cylinder, a superconducting field coil adiabatically supported by the end shaft and disposed in the vacuum section; and one side is in thermal contact with the superconducting field coil,
The other includes a heat transfer member extending from the vacuum section through the end shaft and protruding out of the vacuum section, a liquid reservoir provided in thermal contact with the superconducting field coil and storing liquefied gas, and the liquid reservoir. It is provided with a communication pipe that communicates with the outside and maintains the pressure of the liquid reservoir constant, and cools the superconducting field coil by cooling the protrusion of the heat transfer member, and also reduces the thermal load of the superconducting field coil. A rotor for a superconducting rotating machine in which fluctuations are absorbed by the latent heat of vaporization of the liquefied gas. (2) A rotor for a superconducting rotating machine according to claim 1, wherein the liquefaction point of the liquefied gas stored in the liquid reservoir is the same as or slightly higher than the cooling temperature of the protrusion of the heat transfer member.