JPS5947964A - Superconductive rotor - Google Patents

Abstract

PURPOSE:To improve the superconductive characteristic of a superconductive rotor and to increase the output per unit area by axially dividing a rotor coil into a plurlity, arranging small pieces at the distance on the divided surfaces, and providing a coolant medium flowing passage between the divided surfaces. CONSTITUTION:Small pieces 16 are interposed between 3 circular coils in a rotor coil 15, a duct 17 for flowing coolant medium is formed between coil layers, and pole filler 18 is mounted in the inner ring. A spacer 22 which becomes the same size as the size of the upper surface of the coil 15 is mounted in space between the fillers 18 on the upper surface of the uppermost layer of the coil 15 to form an inner peripheral side passage 23. Further, the coil 15 and the filler 18 are held by centrifugal force by a bind 24 on the top, an outer peripheral side passage 25 is formed between the bind 24 and the outer peripheral wall 7, thereby flowing the cooling medium. In this manner, the cooling performance of the coil 15 can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a superconducting rotor with improved cooling function of rotor windings.

[Technical background of the invention]

A so-called superconducting rotor is a superconducting rotor of a rotating electric machine such as a generator or an electric motor.The rotor windings installed in the superconducting rotor are cooled with a cooling medium such as liquid helium to maintain the superconducting state. This is what I did. In such a superconducting rotor, when the rotor windings are cooled, the cooling medium evaporates, and a difference in specific gravity occurs between this and the cooling medium that does not evaporate. There is a natural circulation cooling method using the so-called thermosiphon effect, in which a cooling medium having a different specific gravity is naturally circulated between the rotor windings.

A superconducting rotor employing this natural circulation cooling method will be explained below with reference to FIG.

Figure 1 shows the cross-sectional structure of a superconducting rotor of a generator, for example. In the figure, 1 is the normal temperature rotor part, and both longitudinal ends of this form a shaft 2, which is the drive side shirt) 2m and the drive side shaft 2m. It is constructed on the machine side shaft 2b and maintains rigidity as a rotor. Further, the inside of the normal temperature rotor section 1 constitutes an outer peripheral wall 7 of a gap rotor section 6.

Further, the gaps 3 and 5 form a closed space in the circumferential direction of the room temperature rotor section 1, and these gaps 3 and 5 are made into a vacuum for heat shielding of the room temperature rotor section 1.
, 5 to prevent heat radiation.

Further, a rotor winding 10 is wound in a winding storage part 9 formed by an outer peripheral wall 7 of the low-temperature rotor part 6 and an inner peripheral wall 8 facing thereto, and further, a rotor winding 10 is wound on the inner peripheral wall 8. A hole 12 is formed to pass through the wire storage portion 9 and the axial hollow portion 1. This hole 12 has an inlet hole 121 in the center and an outlet hole 12b in the left and right ends, and a cooling medium such as liquid helium is supplied to the axial hollow part 1 through a cooling medium supply pipe 13. is filled up to the free liquid level 14 in the axial hollow part 1. Note that the hole 1 in the inner peripheral wall 8 described above
Reference numeral 2 functions as a flow path for allowing the cooling medium filled up to the free liquid level 14 to flow to the rotor' winding 10.

In the superconducting rotor configured as described above, in this rotating state, the cooling medium in the axial hollow part 1 is stretched against the inner wall of the axial hollow part 11 by centrifugal force, and the free liquid level 14, and this evaporated gas is discharged to the outside of the room temperature rotor section 1. Furthermore, the centrifugal force causes the cooling medium to
It enters the winding separation part of the field winding 10 through the inlet hole 12a, cools the rotor winding 10 while flowing through cooling passages on the upper and lower surfaces and both side surfaces of the rotor winding 10, and then flows through the outflow hole. 12b
and returns to the axial hollow part 11.

This circulation of the cooling medium is due to the thermosiphon effect, which means that the cooling medium in a low temperature state flows in from the inflow hole 12a, is evaporated and cooled between the rotor windings 10, and then the cooling medium becomes in a high temperature state. is what flows out from the outflow hole 12b.

[Problems with background technology]

In cooling the rotor winding 10 in the superconducting rotor, in order to increase the cooling effect and maintain a good superconducting state, it is necessary to increase the circulating flow rate of the cooling medium and to
It is important to increase the contact area between the cooling medium and the cooling medium.

In this case, in order to increase the circulation flow rate of the cooling medium in the former case, it is necessary to increase the temperature difference between the cooling mediums, improve the circulation of the cooling medium in a low temperature state to the extent possible, and obstruct the circulation of the cooling medium in a high temperature state. Thus, it has been considered to adjust the size of the inlet hole 12h. However, in the superconducting rotor having the above configuration, the cooling medium that enters through the inflow hole 12a passes through the surface of the inner peripheral wall 80 and the winding separation part, and then flows left and right, and immediately flows out through the outflow hole 12b. Since the rotor winding 10 is integrally wound and has a cooling medium flowing through its top, bottom and both sides, the thermosiphon effect of the centrifugal force field is small, and therefore the cooling medium natural circulation is not carried out well, and the flow rate is low. In addition, the contact area of the rotor winding JO with the cooling medium is 5-small, so the cooling effect is also small, making it impossible to obtain a good superconducting state, which has the drawback that the output per unit area of this superconducting rotor cannot be large. Ta.

[Purpose of the invention]

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a superconducting rotor that can obtain good superconducting characteristics and thus has a large output per unit area.

[Summary of the invention]

In the superconducting rotor according to the present invention, the rotor winding is divided into a plurality of pieces in the axial direction, and small pieces are arranged at a distance from each other on the divided surfaces, and a cooling medium flow path is formed between the divided surfaces. In addition, the above object is achieved by providing a large number of cooling medium flow passages.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to the drawings. FIGS. 2 to 4 are configuration diagrams showing one embodiment of a superconducting rotor according to the present invention. In this -6= embodiment, only the internal structure of the winding storage portion 9 between the outer circumferential wall 7 and the inner circumferential wall 8 in FIG. 1 is shown.

In FIG. 2, reference numeral 15 denotes a rotor winding in which a small piece 16 is interposed between the mutual surfaces of three annular windings to form a duct 17 through which a cooling medium flows between the winding layers. A pole clamp 18 is installed inside the ring. These are stored in a winding storage section 9 formed between the outer peripheral wall 7 and the inner peripheral wall 8. Further, as shown in FIG. 4 in detail, the left and right ends of the inner circumferential wall 8 are attached with fasteners 19 on the winding storage section 9 side, and thermally insulated 20 An outflow pipe 21 is provided. This outflow pipe 21 is thermally insulated 20 in order to prevent temperature changes when the cooling medium flows. Further, on the upper surface of the uppermost layer of the rotor winding 15, a spacer 22 is attached between the poles 18 and has the same dimensions as the upper surface of the rotor winding 15, and the spacer 22 is attached to the inner peripheral side flow passage. 23 is formed. Furthermore, a bind 24 for holding the rotor winding 15 and the pole piece 18 against centrifugal force is attached to the upper part thereof.

Therefore, an outer circumferential flow passage 25 is formed between the bind 24 and the outer circumferential wall 7 to allow the cooling medium to circulate.

Further, an inflow pipe 26 is provided at the center of the inner peripheral wall 8, passing through the pole piece 18 and communicating the axial center hollow part 11 with the inner peripheral side flow passage 23. The core hollow part 11 communicates with the inner circumference side flow passage 23 and the said outer circumference side flow passage 25. Also, this inflow pipe 26 is connected to the outflow pipe 2.
Similar to 1, thermal insulation 20 is provided to prevent temperature changes in the cooling medium. Further, the terminal block 18 and the rotating pre-winding a15 are provided apart from each other.
is formed.

In the superconducting rotor configured as described above, during rotation, a cooling medium such as liquid helium is stretched against the side surface of the axial hollow part 11 of the inner circumferential wall 8 due to centrifugal force, and passes through the inlet pipe 26 into the inner wall. Circumferential flow path 23 and outer circumferential flow path 25
The water is divided at the branch point. Here, it passes through the inner peripheral side flow passage 23 to the side flow passage 27, where the inner peripheral surface of the rotor winding 15 is cooled, and then passes through the duct 17 between the winding layers of the rotor winding 15. The glabellar surface of the rotor winding 150 is cooled to reach the outer peripheral side flow passage 25 at the outer peripheral part of the rotor winding 15, and then flows out through the outflow pipe 21 into the axial center hollow part 1.

On the other hand, the cooling medium that has reached the outer circumference side flow passage 25 from the inflow pipe 26 passes through the upper surface of the bind 24, reaches the outer circumference side flow passage 25 on the outer circumference of the field winding 15, and then passes through the flow pipe 2. It flows out into the shaft center hollow part 1.

According to the embodiment described above, the inlet pipe 26 which is thermally insulated 20
is extended to the vicinity of the uppermost surface of the rotor winding 15, and the rotating pre-winding 815 is further divided into a plurality of pieces in the radial direction of the shaft 2, with a small piece 16 interposed between them to form a duct 17 as a passage for the cooling medium. This is achieved by increasing the heat dissipation area.9
- An inner peripheral side flow path 23 for the medium is provided. Further, the outflow pipe 21 was provided with thermal insulation 20 and extended to the vicinity of the free liquid level 14 to promote the thermosiphon effect. For these things,
It becomes possible to improve the cooling performance of the rotor winding 15.

The present invention is not limited to the above-mentioned embodiment. For example, the inflow pipe 26 passes through the bind 24, but the bind 24
It goes without saying that the size of the hole in the through-hole 4 may be limited or it may be closed, and that various other modifications can be made without departing from the gist of the present invention.

〔Effect of the invention〕

According to the present invention described above, it is possible to prevent the promotion of natural circulation due to the thermosiphon effect of the cooling medium that cools the rotor winding, so that the rotor winding can obtain good superconducting properties, and therefore A superconducting rotor with high output power can be provided.

10-

[Brief explanation of the drawing]

FIG. 1 is a partial sectional view showing a conventional superconducting rotor, FIG. 2 is a partial sectional view showing an embodiment of a superconducting rotor according to the present invention, and FIG. 3 is a partial sectional view showing an embodiment of a superconducting rotor according to the present invention. FIG. 4 is a block diagram showing a part of FIG. 2 in detail. Low temperature rotor part, 7... Outer peripheral wall, 8... Inner peripheral wall, 9.
... Winding storage section, 10 ... Rotor winding, 11 ... Axial center hollow part, 12 ... Hole, 13 ... Cooling medium supply pipe,
14...Free surface, 15...Rotor winding, 16...
・711 pieces, 17... duct, 18... extra stuff,
19... Fastener, 20... Thermal insulation, 21... Outflow pipe, 22... Cover, 23... Inner peripheral side flow path,
24... Bind, 25... Outer peripheral side flow path, 26...
...Inflow pipe, 27...Side flow passage. Applicant's agent Patent attorney Takehiko Suzue 11- Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] The cooling medium contained in the axial center hollow part is stretched onto the inner wall of the axial center hollow part by centrifugal force during rotation, and the cooling medium is applied to the winding storage part formed between the inner wall and the heat radiation prevention plate. In the superconducting rotor, the rotor winding stored in the winding storage part is cooled and maintained in a superconducting state by circulating a cooling medium, and the rotor winding is divided into a plurality of pieces in the axial direction. death,
A superconducting rotor characterized in that small pieces are arranged with a distance between the divided surfaces, and a large number of flow passages for circulating the cooling medium are provided in the winding storage section.