JP2000012197A - High frequency feeding bus bar - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high frequency feeding bus bar, in which an opposite area of conductors to each other has a same value in spite of switching of a feeding zone so that electromagnetic coupling between them is dense to improve an efficiency. SOLUTION: Four inner conductors 22-25 with their hollow portions as cooling flow passages 27 are rectangularly disposed in four sides. A hollow-shaped outer conductor 21 is disposed outside of the inner conductors 22-25, while insulating layers 26 are provided between the respective conductors 22-25. Feeding to one zone B is performed by a combination of two inner conductors 23, 24 in opposite angle positions and the outer conductor 21, while feeding to the other zone A is performed by a combination of two inner conductors 22, 25 in opposite angle positions and the two inner conductors 23, 24. Thereby, because an opposite area of conductors 21-25 to each other can have a same value regardless of feeding to either of the zones A, B, electromagnetic coupling can be condensed to improve an efficiency. Besides, adjustment of a high-frequency resonance is simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-frequency power supply bus bar, and more particularly to a high-frequency heating coil of a down-flow nozzle of a glass melting furnace used for treating high-level waste liquid generated by reprocessing spent fuel of a nuclear reactor. It is suitable for power supply.

[0002]

2. Description of the Related Art One of the cases where high frequency power needs to be supplied from a high frequency power supply is a high frequency of a down-flow nozzle of a glass melting furnace used for processing high-level waste liquid generated in reprocessing of spent fuel of a nuclear reactor. There is a heating coil, and a bus bar for high-frequency power supply is used.

In order to reduce the inductance, a conventionally used high-frequency power supply busbar is opposed to a pair of flat conductors 1 and 2 with an insulator 3 interposed therebetween, as shown in FIG. And these are bolts 4 made of insulating material.
, And cooling tubes 5 are attached to the outer surfaces of both conductors 1 and 2 by brazing or the like.

In such a bus bar, both conductors 1 and 2
2. Leakage magnetic flux is generated from both side parts of 2, the need for special insulating bolts 4, poor workability such as installation of cooling pipes such as brazing, and multiple zones such as upper and lower high-frequency heating coils There is a problem that the structure becomes complicated when a plurality of conductors are required, for example, when power supply is switched for each zone separately.

Therefore, as a bus bar for high-frequency power supply that solves these problems, for example, as shown in FIG.
2, 13 and 14 are linearly arranged, and an insulating layer 15 is provided between them.
A cooling passage 16 has been developed in which hollow portions 13 and 14 are used as cooling passages 16, respectively.

In this high-frequency power supply bus bar, power is supplied to upper and lower two zones A and B and power is supplied to the entire upper and lower areas A + B by a combination of three inner conductors 12, 13, and 14 and one outer conductor 11. I have to.

[0007]

However, according to such a bus bar for high-frequency power supply, two upper and lower zones A,
B and the power supply to the upper and lower zones A + B can be switched.
There is a problem that the opposing area between X and Y changes to X, Y, and Z, and adjustment for high-frequency resonance is difficult.

Further, when the distance from the high-frequency power supply to the power supply destination is increased, further improvement in efficiency is required. However, in such a busbar for high-frequency power supply, the electromagnetic coupling between conductors is not sufficiently dense. There is.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art. Even if switching is performed for each zone, the opposing areas of conductors can be made the same, electromagnetic coupling can be dense, and efficiency can be improved. An object is to provide a bus bar for high-frequency power supply.

[0010]

According to a first aspect of the present invention, there is provided a high-frequency power supply bus bar for dividing a high-frequency power supply into a plurality of zones and supplying power while switching each zone. There are four internal conductors each having a hollow cooling passage, and the four internal conductors are arranged in four directions, and a hollow external conductor is arranged outside the four internal conductors. An insulating layer is provided between each of the inner conductor and the outer conductor.

According to this high-frequency power supply bus bar, four internal conductors each having a hollow cooling passage are arranged in four sides to form a rectangular shape, and a hollow external conductor is arranged outside these to form a rectangular shape. Since the insulating layer is provided between each of the conductors, the electromagnetic coupling can be made dense and the efficiency can be improved.

According to a second aspect of the present invention, in the busbar for high-frequency power supply according to the first aspect of the present invention, the four inner conductors and the outer conductor are connected to two inner conductors at diagonal positions. Power supply to two zones is switched by a combination of an external conductor and a combination of two internal conductors at diagonal positions.

According to this high-frequency power supply bus bar, power is supplied to one zone by combining the four inner conductors and the outer conductor with the two inner conductors and the outer conductor at diagonal positions, and the power is supplied to the diagonal position. Power is supplied to the other zone by a combination of two internal conductors, so that even if power is supplied to any of the zones, the opposing areas of the conductors can be made the same, and the adjustment of high-frequency resonance becomes easy. .

According to a third aspect of the present invention, there is provided a bus bar for high-frequency power supply, wherein the four inner conductors and the outer conductor are formed in a flat pipe shape. It is a feature.

According to this high-frequency power supply bus bar, the four inner conductors and the outer conductor are formed in a flat pipe shape, so that the electromagnetic coupling can be further increased, and the higher electromagnetic coupling can be achieved. The efficiency can be improved.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to the drawings. FIGS. 1 and 2 show a high-frequency power supply bus bar according to an embodiment of the present invention, which is a cross-sectional view when applied to power supply to upper and lower heating coils of a flow-down nozzle of a glass melting furnace, and power supply to upper and lower coils. FIG. 5 is an explanatory view of the facing state of the conductor at the time.

This high-frequency power supply bus bar 20 supplies power to a high-frequency heating coil C for heating a downflow nozzle N at the bottom of the glass melting furnace, and is divided into two zones A and B by an upper coil C1 and a lower coil C2. Or to switch and supply power to heat the entire two zones A + B.

The high-frequency power supply bus bar 20 includes an outer conductor 21 and four inner conductors 22 and 2 disposed therein.
3, 24, 25, and an insulating layer 26 is provided between the conductors 21 to 25, respectively.

The four inner conductors 22 to 25 are formed of flat rectangular pipes having hollow portions, and the hollow portions serve as cooling passages 27 for supplying and discharging a cooling fluid.
Nos. 2 to 25 are arranged in four directions, and two are arranged on the left and right and two on the upper and lower sides in a large flat rectangular pipe shape.

A hollow rectangular outer conductor 21 is disposed outside so as to surround the four inner conductors 22 to 25, and the outer conductor 21 maintains a space between the pair of side plates 21a. Therefore, it is constituted by a flat rectangular pipe-shaped partition pipe 21b arranged vertically and tightened with a bolt 21c penetrating the both side plates 21a to form a large flat rectangular pipe-shaped pipe. As a cooling passage 27 for supply and discharge of the gas.

An insulating layer 26 made of a plate such as a powder of magnesium oxide or mica is provided in each of the gap between the four internal conductors 22 to 25 and the gap between the internal conductors 22 to 25 and the external conductor 21. It is electrically insulated.

In the high-frequency power supply bus bar 20 configured as described above, the internal conductors 22 and 25 at diagonal positions are connected to the upper terminal 28 of the high-frequency heating coil C, and the intermediate terminal 29 is connected to the intermediate terminal 29, as shown in FIG. One set of inner conductors 2 at diagonal positions
3 and 24, and the external conductor 21 is connected to the lower terminal 30.

Therefore, when the zone A is heated by the upper coil C1, a pair of inner conductors 2 at diagonal positions are heated.
2, 25 and another pair of inner conductors 23, 24 at the diagonal position. When the lower coil C2 heats the zone B, power is supplied to the pair of inner conductors 23 at the diagonal position. , 24 and the outer conductor 21, and when heating the entire zone A + B, power is supplied by a combination of the pair of inner conductors 22 and 25 and the outer conductor 21 at diagonal positions. Can be. And
When zone A is heated, zone B is heated within a range indicated by X in FIG.
When heating the entire zone A + B in the range indicated by Y in FIG. 2B, the conductors 21 to 25 face each other in the range indicated by Z in FIG. And the inductance thereof can be reduced, and the adjustment of high-frequency resonance can be facilitated.

Further, since the inner conductors 22 to 25 are arranged on all sides, the electromagnetic coupling can be made denser, and the manufacture and installation can be facilitated. Is formed in the shape of a flat square pipe, the electromagnetic coupling can be further improved.

[0025]

According to the high-frequency power supply bus bar according to the first aspect of the present invention, as described above in detail with one embodiment, four internal conductors each having a hollow portion as a cooling channel are provided. To form a rectangular shape, and hollow outer conductors are arranged outside of them, and an insulating layer is provided between each of the conductors. Can be.

According to the high-frequency power supply bus bar of the second aspect of the present invention, the four inner conductors and the outer conductor are combined into one zone by combining the two inner conductors and the outer conductor at diagonal positions. Power is supplied to the other zone by combining two inner conductors at diagonal positions, so that even if power is supplied to any zone, the opposing areas of the conductors can be made the same, and high-frequency Adjustment of resonance is also facilitated.

Further, according to the bus bar for high-frequency power supply according to the third aspect of the present invention, since the four inner conductors and the outer conductor are formed in a flat pipe shape, the electromagnetic coupling is further improved. And the efficiency can be further improved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an embodiment of a bus bar for high-frequency power supply according to the present invention, which is applied to power supply to heating coils above and below a flow-down nozzle of a glass melting furnace.

FIG. 2 is an explanatory diagram of a facing state of conductors when power is supplied to upper and lower coils according to an embodiment of the present invention.

FIG. 3 is a schematic perspective view of a conventional high-frequency power supply bus bar.

FIG. 4 is a schematic sectional view of another conventional high-frequency power supply bus bar.

[Explanation of symbols]

 Reference Signs List 20 bus bar for high-frequency power supply 21 outer conductor 22 to 25 inner conductor 26 insulating layer 27 cooling channel N downflow nozzle C high-frequency heating coil C1 upper coil C2 lower coil A, B zone

Continued on the front page F term (reference) 3K092 PP09 PP11 PP20 QA05 QB27 QB52 QC21 QC67 UC07 VV18 VV40 5G365 AA05 AA06 AB01 CA04 CA07 CB01

Claims (3)

[Claims] 1. A high-frequency power supply bus bar for supplying power while switching from a high-frequency power source into a plurality of zones and switching each zone, wherein four internal conductors each having a hollow cooling passage are arranged and combined in four directions. A high frequency power supply characterized in that a hollow outer conductor is arranged outside the four inner conductors and an insulating layer is provided between each of the four inner conductors and the outer conductor. Busbar. 2. The method according to claim 1, wherein the four inner conductors and the outer conductor are
The power supply to two zones is switched by a combination of two inner conductors and an outer conductor at diagonal positions and a combination of two inner conductors at diagonal positions. Busbar. 3. The bus bar for high-frequency power supply according to claim 1, wherein the four inner conductors and the outer conductor are formed in a flat pipe shape.