JPS6154869A - Supporting structure of superconductive rotor cryogenic coolant supply and exhaust mechanism - Google Patents

Abstract

PURPOSE:To support without vibration by concentrically regulating and supporting a coolant supply and exhaust mechanism at a hollow cylindrical shaft, coating a blind cover on the seal of a shaft, evacuating in vacuum and sealing it, thereby enabling to regulate to center and to fix from the exterior. CONSTITUTION:A ring-shaped seat 10 is engaged with the outer periphery of the supply and exhaust mechanism 8 of a superconductive rotor, and three or more retaining holes 10a of 3 or more studs 11 are formed at an equal interval on the outer periphery of the set 10. A hollow cylinder 2b is inserted into the mechanism 8, and connected with a torque tube of a rotor body and an ambient temperature damper. A female threaded hole 2b1 and seat 2b2 corresponding to the hole 10a are formed on the cylinder 2b, a stud 11 is engaged within the hole 2b1, and contacted with the bottom of the hole 10a. Further, a blind cover 18 is coated on the hole of the seat 2b2, welded and sealed at e. A hole 16 for removing gap of the space of the seat 2b2 is formed in the shaft 2b.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of the Invention] The present invention relates to a method for supporting a low-temperature refrigerant supply/discharge mechanism in a superconducting rotor within a hollow cylindrical shaft. Such a supply/discharge mechanism requires support without gaps between members in order to maintain a high vacuum and prevent imbalance during rotation, and must be supported at the center of rotation.

[Prior art and its problems]

A vertical cross-sectional view of this type of superconducting rotor is shown in FIG. 3, and its structure will be explained. One of the openings of the cylindrical normal temperature damper 1 is hermetically connected to the flanged solid shaft 2a at point a, and the other is hermetically connected to the flanged hollow shaft 2b at point b. The space surrounded by these three parts contains superconducting coils and other components described later, but the superconducting coil 3 is housed in an airtight container, and both ends of this are connected to a solid F by a torque tube 4.
ll12a is connected to the hollow shaft 2b at locations C and d. A heat exchanger 5 is provided in the middle of the torque tube 4 to remove conductive heat entering the superconducting coil 3 from room temperature to extremely low temperature. A low-temperature Danhalo whose both ends are connected to the heat exchanger 5 is provided on the outer circumferential side of the coil, and the space 7 is maintained at a high vacuum and is insulated. The refrigerant supply/discharge mechanism 8 is provided in the hollow cylindrical shaft 2b, and is a refrigerant supply system to the coil section.The refrigerant that has done effective cooling work in the coil section is further removed by the heat exchanger 5, and then transferred to the outside. Pipes 8a such as a return system for discharging the air and a current supply system to the coil are assembled. Generally, the supply/discharge mechanism section 8 is completely assembled before the hollow cylindrical shaft 2b is attached, and then the hollow cylindrical shaft 2b is inserted and assembled. At this time, a support piece 9 is interposed between the hollow cylindrical shaft 2b and the supply/discharge mechanism section 8, and by heating the hollow cylindrical shaft 2b and shrink-fitting it, a corner gap is created between each member. Preventing this from occurring.

However, according to this method, when inserting the hollow cylindrical shaft 2b, there is a risk that the supply/discharge mechanism section 8 will be damaged due to external force equivalent to the shrinkage fit, and even if the hollow cylindrical shaft 2b is inserted safely without any damage, If a problem such as vacuum breakage occurs in the piping inside the rotor, including the supply/discharge mechanism section 8, when attempting to pull out the hollow cylindrical shaft 2b for inspection or repair, the support piece 9 will close and the supply/discharge will be interrupted. The mechanism part 8 cannot be easily pulled out, and if it is pulled out forcibly, there is a risk of damaging the supply/discharge mechanism part piping.

[Purpose of the invention]

It is an object of the present invention to provide a highly reliable superconducting rotor structure that eliminates the drawbacks of the conventional shrink-fit fixing method, allows easy installation and removal of the supply/discharge mechanism, and maintains a vacuum.

[Key points of the invention]

In this invention, a rigid ring-shaped seat is fitted onto the outer periphery of a refrigerant supply/discharge mechanism, and is screwed into threaded holes extending from counterbores provided at at least three locations on the outer periphery of a hollow cylindrical shaft. The refrigerant supply/discharge mechanism can be adjusted and supported concentrically with the hollow cylindrical shaft by abutting the stud in a receiving hole provided in the ring-shaped seat, and the counterbore is covered with a blind cover to vacuum seal the refrigerant supply/discharge mechanism. This is intended to prevent damage to the supply/discharge mechanism section, refrigerant piping, etc. during disassembly during inspection.

[Embodiments of the invention]

FIG. 1 and FIG. 2 show an embodiment of this invention.
FIG. 1 is a cross-sectional view of the support portion of the hollow cylindrical shaft, and FIG. 2 is a longitudinal cross-sectional view of the same. This structure will be explained in accordance with the assembly order. First, a rigid ring-shaped seat 10 is fitted onto the outer periphery of the supply/discharge mechanism section 8, and its position is the same as the support piece 9 in FIG. There are holes 10a (four in the figure) for receiving studs, which will be described later. Supply/discharge mechanism section 8 in this state
The hollow cylinder 2b is inserted into the rotor, and the hollow cylinder 2b is connected to the torque tube of the rotor body and the room temperature damper.

It will be done. The hollow cylinder 2b is provided with a female threaded hole 2bx and a counterbore portion 2b2 in advance at a position corresponding to the receiving hole 10a,
The stud 11 is screwed into the female screw hole 2b1, and the tip of the stud is brought into contact with the bottom of the receiving hole 10a. Thereafter, while loosening or tightening the stud 11, the supply/discharge mechanism section 8 is centered so as to be located at the center of the hollow cylinder 2b, and the nut 12 is tightened and fixed to prevent rotation. Finally, counterbore 2b
A blind lid 18 is placed over the z opening, and the portion e is welded and sealed. The hollow cylindrical shaft 2b is provided with a communication hole 16 that communicates with the vacuum space 7 inside the rotor in order to remove gas from the counterbore 2bz space.

〔Effect of the invention〕

According to this invention, after the supply/discharge mechanism section and the hollow cylindrical shaft are assembled, the centering can be adjusted and fixed from the outside, so disassembly and assembly are easy, and support with good vibration resistance and no gaps between members can be achieved. In addition, it is possible to provide a superconducting rotor supply/discharge mechanism support structure that is free from damage or destruction during disassembly.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of a hollow cylindrical shaft showing the supply/discharge mechanism support portion of a superconducting rotor according to an embodiment of the present invention, Fig. 2 is a longitudinal cross-sectional view of the same hollow cylindrical shaft, and Fig. 3 is a conventional FIG. 2 is a longitudinal cross-sectional view of a superconducting rotor structure. 2b=hollow cylindrical shaft, 2b1: screw hole, 2b2: counterbore, 3: superconducting coil, 8: cryogenic refrigerant supply/discharge mechanism section, 10
: Ring seat, 11: Stud, 12: Nut, 16:
Communication hole, 18: Blind lid.

Claims (1)

[Claims] 1) A superconducting rotor in which a superconducting coil is cooled by a cryogenic refrigerant introduced from the outside through a cryogenic refrigerant supply/discharge mechanism that is concentrically supported within a hollow cylindrical shaft and vacuum-insulated by the hollow cylindrical shaft. A support structure for a cryogenic refrigerant supply/discharge mechanism section, wherein a rigid ring-shaped seat is fitted into the outer periphery of the refrigerant supply/discharge mechanism section, and counterbores are provided at at least three locations on the outer periphery of the hollow cylindrical shaft. The refrigerant supply and discharge mechanism can be adjusted and supported concentrically with the hollow cylindrical shaft by abutting a receiving hole provided in the ring-shaped seat with a stud screwed into a screw hole provided extending from the ring seat, and A support structure for a superconducting rotor cryogenic refrigerant supply/discharge mechanism section, characterized in that the counterbore section is configured to be vacuum-sealed by covering the blind cover.