JPS60163409A - Direct cooling type electromagnetic coil - Google Patents

Abstract

PURPOSE:To contrive the improvement in cooling effect and mechanical strength by leading out two supply vents and two exhaust vents which are adjacent in the winding direction belonging to the cooling pipes of different windings or one supply vent and one exhaust vent through a common insulating bushing. CONSTITUTION:An exhaust vent 6b of a cooling pipe 6 and a supply vent 7a of a cooling pipe 7 are led out with being inserted through an insulating bushing 8. The supply or exhaust vents of other cooling pipes are led out similary. Thus, it is unnecessary to keep a distance between the exhaust vent 6b and the supply vent 7a and accordingly, the non-cooled part between the vents 6 and 7 is eliminated and a conductor 2 is cooled uniformly and the partial increase of temperature of the conductor 2 in the vicinity of the supply vent can be prevented. Also, when the winding circuit of conductor 2 is n, (n+1) pieces of insulating bushings 8 are enough. According to this, numer of through holes 10 of a fixing frame 9 is also reduced and the range where those are arranged becomes small so that the mechanical strength is enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a directly cooled magnetic line shaft, and more particularly to a directly cooled magnetic line axis suitable for a toroidal magnetic field coil of a nuclear fusion device.

[Background of the invention]

In electromagnetic wire shafts used in toroidal magnetic field coils of nuclear fusion devices, the temperature of the conductor increases significantly due to the flow of large currents, and the interlayer insulation between each turn of the conductor and the ground insulation of the conductor are exposed to high heat and thermal expansion. There is a risk that the conductor itself will deteriorate and eventually break, or the conductor itself may break due to large thermal stress or large electromagnetic force generated when the fusion device is started or stopped.

For this reason, as this type of electromagnetic beam shaft, a directly cooled fiiIM wheel 1 as shown in FIGS. 1 and 2 is generally employed. That is, it is wound multiple times. conductor 2
A cooling pipe 5 for distributing water as a cooling medium is buried along the winding surface of the electromagnetic coil l, and the electromagnetic coil l is connected by soldering, brazing, etc., so that the entire electromagnetic coil l can be directly cooled. . Note that an interlayer insulator 3 is provided between each turn of the conductor 2, and a ground insulator 4 is provided around the entire conductor 2.

However, in the conventional directly cooled electromagnetic wire shaft.

As shown in Fig. 2, cooling water is supplied through the supply port A1 provided in the innermost winding of the conductor 2 and circulated in the direction of the arrow in the cooling pipe of each winding. Since the cooling water is discharged from the II' outlet A2, the passage length of the cooling water becomes long and a large temperature is generated at each of the supply port A1 and the discharge port A, and a sufficient cooling effect cannot be obtained over the entire electromagnetic wire ring 1.

In order to improve this problem, a cooling method has been proposed in which the passage length of the cooling water is shortened, as shown in FIG. In this cooling method, the cooling water passage is divided for each turn of the conductor and is formed along the winding direction P of the conductor, and each divided passage has a supply port Bx, C1, Dx and Discharge port B2゜C3,D:! is attached.

Figure 4 shows the structure of the cooling pipe water supply and discharge structure in such a cooling system.The cooling pipe 6, which is divided into each winding of the conductor 2, is bent at an almost right angle at the end of each winding and extended. The cooling pipe 7 disposed next to the cooling pipe 6 is similarly bent and extended at a substantially right angle at the starting end of the next winding following the terminal end. The supply lower a protruding from the side
is formed. Note that supply ports and discharge ports are similarly formed in the other windings of the cooling pipe.

According to this cooling method, since each turn of the conductor 2 is divided and cooled separately, the path length of the cooling water can be shortened and the entire electromagnetic beam axis l can be cooled well.

By the way, in a large electromagnetic wire shaft, it is necessary to firmly hold the electromagnetic wire ring on a fixed frame so that it does not move due to the large electromagnetic force applied to the conductor when energized. This fixed frame is usually made of a metal material with high mechanical strength and is grounded.

In addition, in such a fixed frame that holds the electromagnetic beam axis, the cooling pipe must pass through the fixed frame in order to lead the supply and discharge ports to the outside, but the cooling pipe is at the same potential as the conductor. Therefore, it is necessary to insulate the part that penetrates the fixed frame, which is at ground potential.

FIG. 5 is a perspective view of such a fixed frame penetrating portion. The discharge port 6b of the cooling pipe 6 and the supply lower a of the cooling pipe 7 are inserted through separate insulating bushings 8 L2 and led out from shell holes 610 of the fixed frame 9. This insulating bushing 8 is integrally formed with a flap portion 8a.

This ensures an insulating creepage distance between the fixed frame 9 and the conductor 2.

However, such a configuration has various drawbacks as follows.

First, the insulating bushing 8 has a collar 8a.

Adjacent outlet 6b of cooling pipe 6 and supply lower a of cooling pipe 7
The conductor 2 must be separated by a distance Q that is equal to or larger than the diameter of the flange portion 8a, and the conductor 2 is not cooled in the area between this distance. In particular, the higher the voltage, the larger the diameter of the collar 8a, so this distance @Q becomes longer, and the humidity of the conductor 2 locally increases significantly, causing the interlayer I@edge material 3 and the ground l1lAa material 4 to heat up. Deteriorates or breaks due to stretching.

Furthermore, as the number of windings of the conductor 2 increases, the number of supply and discharge ports for the cooling pipes drawn out also increases, but since each supply and discharge port needs to be separated by the distance Q as described above, it can be used over a wide range. Supply and exhaust ports will be placed. Therefore, the fixed frame 9 has many tribute holes 10 over a wide area.
Since its mechanical strength is reduced, the movement of the electromagnetic wire wheel I cannot be sufficiently suppressed, and there is a risk that the electromagnetic wire axis I will be destroyed by the large electromagnetic force applied during operation.

Furthermore, since there are many supply and discharge ports on the same side, it is difficult to connect piping beyond them.

The connection work must be done with great care so as not to confuse the supply port and the discharge port, making the connection work troublesome.

For example, if a pair of cooling water channels with different supply and discharge ports are connected incorrectly, the cooling water will no longer flow into the two cooling water channels, resulting in an uncooled state, and the conductor 2 will become abnormally heated. The intermediate insulator 3 and the ground insulator 4 deteriorate or break.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a directly cooled electromagnetic coil having a simple structure, which eliminates the above-mentioned drawbacks of the prior art, improves the cooling effect, and improves the mechanical strength.

[Summary of the invention]

To achieve this objective, the present invention provides two supply ports, two discharge ports, or The present invention is characterized in that the number of insulating bushings is reduced and the uncooled portion of the conductor is eliminated by leading out each one of the supply ports and the discharge ports through a common insulating bushing.

[Embodiments of the invention]

Hereinafter, the present invention will be explained in detail based on each illustrated embodiment.

FIG. 6 is a perspective view of a main part of an electric A-wire shaft according to an embodiment of the present invention. In this embodiment, the outlet 6b of the cooling pipe 6 and the supply lower a of the cooling pipe 7, which were led out through the separate insulating pushers 8 in the conventional example shown in FIG. 5, are integrated into one insulating bushing. It is derived by commonly inserting the inside of 8. In addition,
The supply ports of the other cooling pipes are led out in the same manner, and the other structures are the same as the conventional example shown in FIG.

According to this embodiment, the discharge ports 6b and the supply lower A, which are adjacent in the winding direction and belong to the cooling pipes 6, 7 of different windings of the conductor 2, are inserted through one common insulating bushing 8. Therefore, there is no need to separate the state/outlet 6b and the supply lower a as in the conventional example, and therefore the cooling pipe between the discharge port 6b and the supply lower 1'I in the conventional example is By eliminating the uncooled portion, the conductor 2 can be cooled uniformly, and a local temperature rise of the conductor 2 near the supply/discharge port can be prevented. Furthermore, in the conventional example, when the number of turns of the conductor 2 is n, 2a insulating bushings 8 are required, but in this embodiment, (n + 1) insulating bushings 8 are required.
This reduces the number of through holes 10 in the defining frame 9 and narrows the range in which they are arranged, increasing its mechanical strength and reducing the large amount of damage that is applied during operation. The electromagnetic wire ring 1 can be fixed sufficiently firmly so that it does not move against electromagnetic force.

7 and 8 are a schematic cross-sectional plan view and a perspective view of essential parts of an electromagnetic wire according to another embodiment of the present invention. In this embodiment, the direction of flow of cooling water flowing through each sectioned cooling tube of mutually adjacent windings of the conductor 2 is alternately opposite to each other as shown by the arrows. are provided with supply ports Bz and Cx+Dz and discharge ports Bz and Cz+D2, respectively. That is, the discharge port B2 and the supply port 81 are provided at the starting end and the terminal end of the winding of the first layer, and the supply port C1 and the discharge port C2 are provided at the starting end and the terminal end of the winding of the second layer. In addition, a discharge port D2 and a supply port D1 are provided at the beginning and end of the winding of the third layer.
The following items are added sequentially in the same manner. Therefore, as shown in FIG. 8, two supply ports 6a and 7a adjacent in the winding direction belonging to cooling pipes 6 and 7 of mutually different windings of the conductor 2, for example, Bx and Cx in FIG. Similarly, two discharge ports 6b adjacent to each other in the winding direction belong to cooling pipes 6°11 with different windings.
, llb, for example, Cz and Dz in FIG. 7 are each 1
The insulating bushes 8A, which are derived from two common insulating bushes 8A, 8B, and which lead out the supply ports and the insulating bushes 8B, which lead out the discharge ports, are arranged alternately in the radial direction of the electromagnetic coil 1.

According to this embodiment, in addition to obtaining the same effect as the embodiment of FIG. 6, one common insulating bushing 8A or 8B
Since the same supply port or outlet is led out from the insulating bushings 8A and 8B, and these insulating bushes 8A and 8B are regularly arranged alternately in the radial direction of the electromagnetic wire ring l, the piping beyond that is connected to the supply and discharge port. In this case, it is easy to distinguish between the supply port and the discharge port, there are fewer mistakes in connection, and the connection work is also easy.

No. 9@J is a perspective view of a main part of an electromagnetic wire ring according to still another embodiment of the present invention. In this embodiment, in the embodiment of FIG. 8, one common insulating bushing 8A is arranged on one side of the conductor 2 leading out two supply ports 6a+7a, and two discharge ports 6b.

The other common insulating bushing 8B leading out 11b is arranged on the other side of the conductor 2.

Therefore, according to this embodiment, in addition to obtaining the same effect as the embodiment shown in FIG. 8, only the supply port is led out from one side of the conductor 2, and only the discharge port is led out from the other side. Therefore, when connecting the piping beyond the supply port to the supply port, it is easier to distinguish between the supply port and the discharge port, there are fewer mistakes in connection, and the connection work is also easier.

In each of the above embodiments, the case where the cooling pipe is divided into each turn of the conductor 2 has been described; however, the present invention is not limited to this, and the same applies to the case where the cooling pipe is divided into every 2nd or 3rd turn. It can be applied to

[Effects of the Invention] As described above, according to the present invention, two supply ports, two discharge ports, or one each of two adjacent supply ports in the winding direction belonging to cooling pipes with different windings of the conductor Since the supply port and the discharge port are led out through a common insulating bushing, these supply ports are in close proximity, and the conductor can be uniformly cooled and supplied by eliminating the uncooled part of the conductor where no cooling pipe is provided. It is possible to prevent a local temperature rise of the conductor near the leakage port. In addition, the number of insulating bushings can be reduced, and the number of through-holes in the fixed frame for protruding the insulating bushings is also reduced, and the range in which they are arranged is also narrowed, increasing its mechanical strength and preventing electromagnetic radiation. The ring can be firmly fixed.

[Brief explanation of the drawing]

1 and 2 are a perspective view and a schematic cross-sectional plan view of a conventional directly cooled electromagnetic wire shaft, FIG. 3 is a schematic cross-sectional plan view of another conventional directly cooled electromagnetic wire shaft, and FIGS. 4 and 5 6 is a perspective view of the cooling water supply and discharge structure of the same electromagnetic wire ring and the fixed frame penetrating portion, FIG. 6 is a perspective view of the main part of a directly cooled carved i-line shaft according to an embodiment of the present invention, and FIGS. 7 and 8 The figures are a schematic cross-sectional plan view and a perspective view of a main part of a directly cooled electromagnetic wire shaft according to another embodiment of the present invention, and FIG. 9 is a main part of a directly cooled electromagnetic wire wheel according to still another embodiment of the present invention. FIG. 2... Conductor, 6.7.11... Cooling pipe, 6
a. 7a... Supply port, 6b, ], 1b... Discharge port, 8° 8A, 8B... Insulating bushing. ? “lZ″1? : Agent Patent Attorney Kenji Take:,,;□,:,,,,,1
":1.1.1.-4: Figure 1 Figure 2 Figure 311 Figure 4 Figure 50 611 Figure 7 Figure 8 Figure 9

Claims (1)

[Scope of Claims] 1. A conductor wound multiple times in a thin spiral shape, a cooling pipe provided closely to the conductor along the winding direction of the conductor, and a cooling medium in the cooling pipe that connects the conductor. A direct cooling type electromagnetic wire ring is provided with a supply port and a discharge port for each winding of the conductor, and the second supply port and discharge port are led out from the side surface of the conductor through an insulating bushing. Direct cooling characterized in that two supply ports, two discharge ports, or one supply port and one discharge port each adjacent to each other in the winding direction belonging to cooling pipes of different windings are led out through a common insulating bushing. Morphological magnetic line axis. 2. According to claim 1, a common insulating bushing is provided in which the directions of flow of the cooling medium flowing through the cooling tubes of mutually adjacent turns of the conductor are opposite to each other, and the two supply ports are led out. A direct cooling type electromagnetic wire ring characterized in that common insulating bushings leading out from the two discharge ports are arranged alternately in the radial direction. 3. In claim 2, a common insulating bushing leading out the two supply ports is disposed on one side of the conductor, and a common insulating bushing leading out the two discharge ports is arranged on one side of the conductor. A directly cooled electromagnetic wire ring characterized by being placed on the other side.