JPH0720330B2 - Ventilation cooling type closed bus - Google Patents

Description

TECHNICAL FIELD The present invention relates to a structure of a ventilation-cooled closed bus bar.

[Conventional technology]

FIG. 3 shows an example of a conventional sealed bus bar of this type described in, for example, Japanese Patent Publication No. 52-29431. In the figure, 1 is an AC generator, 2 is a main transformer, and the two are connected by a sealed bus bar 3. 4 and 5 are closed busbars 3
The outer sheath and the conductor of the conductor 5, the conductor 5 has a cylindrical shape in order to suppress an increase in AC resistance due to the skin effect, and a plurality of laminated flexible connecting conductor pieces for absorbing the thermal expansion and contraction of the plurality of section conductors 5A. 7 are sequentially connected (shown in FIGS. 5 and 6), and an insulation space (cooling / insulation space) 6 is defined between the outer space 4 and the outer cover 4. One end of the conductor 5 has a plurality of connecting terminals 12 welded to a conductor flange 10 and a flexible connecting conductor 14 to which a plurality of connecting terminals 12 are welded to the lead bushing 8 as shown in FIG. A plurality of connecting terminals 13 connected to the bushing terminal 8a and welded to the conductor flange 11 on the other end side are connected to the bushing terminal 9a of the lead bushing 9 via the flexible connecting conductor 14.
It is connected to the. The section conductors of the conductor 5 are separated from other portions inside the conductor by the respective sealing plates 15. The jacket 4 has a cooling air inlet 4A at one end (generator side) and a cooling outlet 4B at the other end (transformer side).
The outlet 4B is connected to a cooling air circulation passage having a circulation fan (not shown).

In this configuration, the jacket 4 is cooled by the cooling air inlet 4A of the jacket 4.
As shown by the solid arrow, the cooling air sent to the inside insulating space 6 flows to the main transformer 2 side while absorbing heat inside the insulating space 6, and flows out from the cooling air outlet 4B.

At this time, part of the cooling air passes through the flange hole 10a of the conductor flange 10 from the space 16 between the connection terminals 12 (the flexible connection conductors 14) adjacent to each other in the circumferential direction through the conductor 5 as shown by the broken line arrow.
Since it intrudes into the conductor 5 (and also penetrates into the conductor 5 from between the laminated flexible connecting conductor pieces 7 of the interconnecting portion of the section conductor 5A), the cooling air is diverted into the conductor 5 in the insulating space 6. A sealing plate 15 is provided in order to prevent a reduction in the flow velocity of the cooling air and a reduction in the cooling ability due to the reduction in the flow velocity.

[Problems to be Solved by the Invention]

In this way, the sealing plate 15 is provided for each section conductor in order to prevent the formation of the cooling air passage in the conductor 5, and this sealing plate has the entire circumference thereof within the conductor 5. Since the welding is performed on the peripheral surface, there is a problem that the mounting work is troublesome and time-consuming, leading to an increase in price, and also making it difficult to clean the inside of the conductor such as removing welding spatter after the production of the conductor 5 of the tube. .

The present invention has been made to solve the above problems,
It is an object of the present invention to provide a ventilation-cooled closed bus bar that does not require a member for preventing shunting in a hollow conductor.

[Means for Solving the Problems]

In order to achieve the above object, the present invention provides a hollow conductor in which a plurality of section conductors are sequentially connected in series by laminated flexible connecting conductor pieces arranged at a predetermined pitch in the circumferential direction. In a bus bar having a cooling / insulating space defined therein and having a jacket for forming a cooling air inlet and a cooling air outlet, the connecting end of the hollow conductor to an electric device is closed by a closing plate. A plurality of connection terminals that project in the axial direction from the connection terminal are provided, and the connection terminals are connected to an electric device via connection conductors.

[Action]

In this invention, since both ends of the hollow conductor are closed by the closing plates, it is possible to substantially prevent the flow of the cooling air to the hollow conductor without providing the sealing plates inside.

〔Example〕

 An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, one connecting end of the conductor 5 is composed of a closing plate 20 for closing the conductor end and a plurality of conductor terminals 12 projecting from the closing plate 20, and the connecting terminal 12 has a flexible connecting conductor 14. It is connected to the bushing terminal 8a through. The other connecting end of the conductor 5 has a closing plate 21 for closing the conductor end and the closing plate 21.
The connecting terminal 13 is connected to the bushing terminal 9a via a flexible connecting conductor 14. The other structure is the same as that of FIG. 3 except that the sealing plate 15 is not provided.

In this structure, since both ends of the conductor 5 are closed by the closing plates 20 and 21, respectively, the shunting of the cooling air from the conductor ends into the conductor 5 is completely prevented.

Of course, in the interconnection portion of the section conductors 5A, the conductors 5 are connected from between the laminated flexible connection conductor pieces 7 as shown by the one-dot chain line arrow.
Although the cooling air enters the inside, the amount thereof is small when viewed from the amount of the cooling air introduced from the cooling air introduction port 4A, and the decrease in the flow velocity in the insulating space 6 due to this slight shunting is The measured value is at most about 10%, which is not a practical problem in cooling performance.

In addition, the closing plates 20 and 21 are provided with a third plate as shown in FIG.
Attach the disk 25 to the conductor flanges 10 and 11 in the figure with bolts 23,
It may be detachable, in which case it is easier to clean the inside.

Further, in this embodiment, cooling air is introduced into both ends of the jacket 4.
Although the outlet is provided, the same effect can be obtained by implementing the present invention when the inlet 4 is provided at the central portion in the longitudinal direction of the jacket 4 and the outlets are provided at both ends.

〔The invention's effect〕

As described above, according to the present invention, by closing both ends of the hollow conductor with the closing plates, it is possible to substantially prevent the flow of cooling air into the hollow conductor without providing any sealing plate inside. As compared with the prior art, it is possible to reduce the labor and cost of mounting the member for preventing the above-mentioned flow shunt, and the labor for cleaning the inside of the hollow conductor.

[Brief description of drawings]

FIG. 1 is a side sectional view showing an embodiment of the present invention, FIG. 2 is a view showing another embodiment of the present invention seen from the position of the arrow II-II in FIG. 1, and FIG. Side sectional view showing the bus bar,
FIG. 4 is a view taken along arrow XX in FIG. 3, and FIGS. 5 and 6 are a side view and a front sectional view of a section conductor connecting portion, respectively. In the figure, 4 ... jacket, 4A ... cooling air inlet, 4B ...
Cooling air outlet, 5 ... conductor, 5A ... section conductor, 7
…… Laminated flexible connection conductor pieces, 12, 13 …… Connection terminals, 14 ……
Flexible connecting conductor, 20, 21 ... Closing plate. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] 1. A hollow conductor formed by sequentially connecting a plurality of section conductors in series with laminated flexible connecting conductor pieces arranged at a predetermined pitch in the circumferential direction, and housing the hollow conductor to cool / insulate the hollow conductor. In a sealed bus bar that divides a space and has a jacket in which a cooling air inlet and a cooling air outlet are formed, a connection end of the hollow conductor to an electric device is closed by a closing plate, and the closing plate is axially extended. A ventilation-cooled closed bus bar, which has a plurality of projecting connection terminals, and the connection terminals are connected to the electric device via connection conductors.