JPS6120205B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a closed switchboard using heat pipes for cooling.

[Technical background of the invention and its problems]

The first example shows an example of using a heat pipe for cooling.
In the closed switchboard (hereinafter simply referred to as the panel) 1 shown in the figure, the heat absorption side (evaporation side) of the heat pipes 5 and 6 is used to cool the main circuit disconnection sections 3 and 4, which are the connection sections of the connecting and disconnecting switches 2. are inserted into the current-carrying members of the main circuit disconnecting parts 3 and 4, and heat radiation fins 7 and 8 are provided on the heat radiation side (condensation side).

In addition, in order to improve the flow of air inside the panel, an intake port 10 is provided on the rear door 9, and exhaust ports 11 and 12 are provided on the ceiling. The cooling air 15 is transferred to the heat dissipation fin 7.
8 and the warm air is released from exhaust ports 11 and 12. However, when heat pipes are arranged in this way, (1) the heat dissipation fins of the heat pipes also become live parts, so insulation dimensions are required between adjacent phases and ground, and space is also required to install supporting insulators, making it difficult to install panels. growing.

(2) The heat dissipation from the heat pipe is better when there is a temperature difference between the heat dissipation fins and the surrounding air (in other words, the lower the ambient air temperature is). Since the heat from the pipes and conductors rises and reduces efficiency, it is necessary to increase the number of fins.

(3) Furthermore, the air temperature above the heat pipe rises due to the heat emitted by the heat pipe, which reduces the allowable current flowing through the upper conductor/bus bar.

(4) Furthermore, if a short circuit or the like occurs within the panel, it will spread from the screen board 14 to the adjacent room.

[Purpose of the invention]

An object of the present invention is to obtain a closed power distribution board that can effectively cool a disconnection section, which is the hottest section, without increasing the outside size of the panel or restricting the arrangement of other equipment.

[Embodiments of the invention]

The present invention will be explained below with reference to an embodiment shown in FIGS. 2 to 7.

The lower pole of the circuit breaker 2 of the closed switchboard 20 is connected from the wall plate bushing 21 via the conductor 22 and the main circuit disconnection section 23, and the upper pole of the circuit breaker 2 is connected from the main bus 26 to the conductor 25 and the disconnection section 24. Connect via . The heat pipes 27 and 28 are connected to the main circuit disconnection section 2 as in FIG.
Insert the heating side of the terminal 31 into the conductive parts 29 and 30 of No. 3 and 24 as shown in the detailed diagram in FIG. Tighten with bolts (not shown). Furthermore, the heat pipe 27 is placed along the conductor 22 of each phase up to the lower end of the wall bushing 21.
Hold it down with bolts and metal fittings 32 as shown in Figure 5. Further, by using the metal fitting 33 shown in FIG. 6, it can be fixed to the side surface of the conductor, and by changing the shape of the metal fitting, it can also be fixed to the lower part of the conductor 22.

On the other hand, the cooling side of the heat pipe 28 is provided with radiation fins 35 as shown in FIG. In other words, there is a heat dissipation fin 3 on the top of the ceiling plate of the circuit breaker 2, which has sufficient insulation dimensions and provides an effective path for cooling air.
5, cooling air from the intake port 38 of the door 37 cools the heat dissipation fin 35, and an exhaust port 39 directly above it cools the heat dissipation fin 35.
Gives out warm air from.

The details of the wall-opening bushing 21 are shown in FIG. 7. A center conductor 40 is made into a tubular shape, into which a short heat pipe 41 with heat dissipation fins 36 attached to the top is inserted and fixed to the center conductor 40 with a flange 42 or the like. Then, it is connected to the heat pipe 27 using an annular heat pipe, a high thermal conductivity member 43, or the like. The conductor connection terminals 44 and 45 are fixed to the center conductor 40 by welding, brazing, bolts, or the like.

[Action of the invention]

The heat of the circuit breaker 2 and the main circuit disconnection parts 23 and 24 is transmitted to the terminals 31 of the heat pipes 27 and 28, and is transmitted to the heat radiation side by the working fluid of the heat pipes 27 and 28, and the heat is transferred to the heat radiation fin 3 in the heat pipe 28.
5 to the cooling air, and in the heat pipe 27, it passes through the wall plate bushing 21 to the heat dissipation fin 36.
It is emitted outside the board.

〔Effect of the invention〕

As described above, according to the present invention, by arranging the heat pipe in close contact with the bus bar, the heat absorption and heat dissipation effects are good, so the temperature difference between the heat generating part and the cooling part can be made almost equal temperature, and the heat transport part There is no need to increase the insulation dimensions between the heat pipe and adjacent parts, and the layout of other equipment is not restricted, making it possible to downsize the panel.The heat dissipation from the cooling heat pipe does not affect other equipment.
Since there is no need to provide ventilation to the partition plate inside the panel, it is possible to obtain a closed switchboard in which an accident does not spread to adjacent rooms.

[Brief explanation of the drawing]

Fig. 1 is a side view of a conventional closed switchboard, Fig. 2 is a side view showing an embodiment of the closed switchboard of the present invention, Figs. 3 to 5 are partial detailed views of Fig. 2, and Fig. 6 is a side view of a conventional closed switchboard. FIG. 7 is a partially detailed sectional view of FIG. 2, showing another embodiment of the present invention. 2...Shiya disconnector, 20...Closed switchboard, 23,
24... Main circuit disconnection section, 22, 25... Conductor, 2
7, 28... Heat pipe, 31... Terminal, 3
5, 36...Radiation fin, 37...Door, 38...
Intake port, 39...exhaust port.

Claims (1)

[Scope of Claims] 1. A circuit breaker chamber provided on one side of the lower part of the box body, the upper and side portions of which are partitioned by a partition wall, with upper and lower disconnection sections provided in the side partition wall, and a circuit breaker chamber that is connected to one of the upper and lower disconnection sections. a first conductor disposed inside the outer wall of the box;
In a closed switchboard comprising a second conductor disposed inside a center conductor of a wall-opening bushing provided through the outer wall of the box body from one of the other one of the upper and lower disconnection parts, a first heat pipe connected via a terminal on the heat absorption side, a heat transport portion of which is disposed in close contact with the first conductor up to the vicinity of the outer wall of the box body, and has heat dissipation fins; and one of the upper and lower sides. a second heat pipe connected to the disconnection part of the heat pipe through a terminal on the heat absorption side, the heat transport part of which is disposed in close contact with the second conductor and inside the center conductor; a third heat pipe whose heat absorption side is connected to the outside of the second heat pipe and has a heat radiation fin in a heat radiation part protruding from the center conductor to the outside of the box; and a third heat pipe in the vicinity of the radiation fin of the first heat pipe. an air intake port provided on a side wall of the box for sucking air for cooling the radiation fins of the first heat pipe; an exhaust port provided on an upper part of the outer wall of the box body for releasing heat from the first heat pipe; A closed switchboard characterized by comprising: