JPS6223522B2 - - Google Patents

Description

[Detailed description of the invention] [Technical field of invention] The present invention relates to closed switchboards.

[Technical background of the invention and its problems]

Heat pipes are used to cool equipment because they can transport large amounts of heat. For example, in the closed switchboard (hereinafter referred to as the board) 1 shown in Fig. 1, in order to cool the main circuit disconnection sections 3 and 4, which are the hottest, the heat absorption side (evaporation side) of the heat pipes 5 and 6 is disconnected from the main circuit. It is inserted into the current-carrying members of the parts 3 and 4, and the heat radiation side (condensation side) is provided with heat radiation fins 7 and 8 and placed in a place with good ventilation. When the number of heat dissipation fins 7, 8 is large, the ends are supported by insulating supports 9, 10.

In addition, in order to improve the air flow inside the panel, the door 11
An intake port 12 is provided on the roof 13, and an exhaust port 14 is provided on the front and rear of the roof 13.
Further, a part of the internal partition plate 16 is made into a net plate 17, and the cooling air 18 from the intake port 12 cools the heat dissipation fins 7 and 8, and the air is discharged from the exhaust ports 14 and 15.

However, in this configuration, (1) Since the heat dissipation fins 7 and 8 of the heat pipes 5 and 6 also become live parts, a required insulation gap is required between the phases and between the ground and the installation of the insulation support parts 9 and 10. As a result, the entire board becomes large.

(2) Since ventilation is required to release the air warmed inside the panel to the outside of the panel, it cannot be used outdoors or in an atmosphere where there is dust or corrosive gas around the panel.

(3) Since the internal partition plate 16 is a mesh plate 17, if a short circuit occurs within the panel, it will spread to the adjacent room.

(4) The above problem can be solved by bringing the cooling sides of the heat pipes 5 and 6 outside the panel, but since the heat pipes 5 and 6 are live parts, they require insulation treatment similar to the main circuit conductors. For this reason, insulation treatment is required at the penetration part of the outer wall and outside the board, which complicates the configuration and results in a large board.

[Purpose of the invention]

An object of the present invention is to provide a closed power distribution board that does not require internal ventilation, can be effectively cooled, and can be downsized.

[Structure of the invention]

The present invention will be explained below with reference to an embodiment shown in FIGS. 2 to 4.

The closed switchboard 20 includes a power supply side bus bar 21, a wall bushing 22, a conductor 23, a main circuit disconnection section 24 on the power supply side, an automatic connecting circuit breaker 2, a main circuit disconnection section 25 on the load side, a conductor 26, and a main busbar 27. are stored and connected.

The heat pipe 30 connects to the main circuit disconnection section 24 on the lower pole side.
The heat absorption side is connected to the terminal plate 34 connected to the terminal plate 34, and the heat radiation side is connected to the wall-opening bushing 22. This configuration is the third
As shown in the figure, connect the heat absorption side of the heat pipe 30 to the terminal 3.
2, the heat radiation side is inserted into the terminal 33 to thermally connect it. Further, the heat pipe 30 is bent into approximately the same shape as the conductor 23 and is placed along the conductor 23. The heat absorption side terminal 32 is connected to the terminal plate 34 of the main circuit disconnecting section 24, and the heat radiation side terminal 33 is connected to the terminal plate 35 of the wall plate bushing 21.
Then, sandwich each conductor 23 and tighten with bolts or the like.

The portion to which the heat dissipation terminal 33 of the heat pipe 30 is connected may be designed to reduce the heat capacity or ceiling by, for example, increasing the size of the center conductor 36 to suppress temperature rise, or increasing the thickness of the wall plate bushing 22 and its supports. The center conductor 36 may be cooled by increasing the degree of heat transfer to the plate or by providing heat dissipating fins 37 on the top of the center conductor 36 as shown in FIG.

On the other hand, the heat pipe 31 connects its endothermic side to the main circuit disconnection section 25 . The structure of this connection part is the same as that of the main circuit disconnection part 24. heat pipe 3
1 is placed along the conductor 26 and connects the heat radiation side terminal 38 of the heat pipe 31 to the bus bar 27.

[Action of the invention]

Next, the cooling effect of the closed switchboard of the present invention will be explained.

The heat generated in the circuit breaker 2 and the main circuit disconnection section 24 for automatic connection is transferred to the heat pipe 3 via the terminal board 34.
The heat pipe 30 is guided to the heat absorption side terminal 32 of
The heat is transmitted to the heat radiation side conductive member 33 by the working fluid inside. The characteristics of the heat pipe 30 do not change even if there is a curved portion, and the heat absorption side terminal 32 and the heat radiation side terminal 33 have almost the same temperature. Heat is transmitted from the heat radiation side terminal 33 to the terminal plate 35 of the wall-opening bushing 22 and the center conductor 36, but since these parts are mutually tightened with bolts, the temperature rise is caused by the terminal plate 34 of the main circuit disconnection part 24.
Since it is lower than , heat is transferred efficiently. The heat transferred to the center conductor 36 of the wall bushing 22 is released into the atmosphere from its surface, the wall bushing 22, and the outer wall of the panel. Therefore, the center conductor 36 is lower than the disconnecting portions 24 and 25, and the heat from the heat radiation side terminal 33 of the heat pipe 30 can be continuously radiated to the outside of the panel.

Heat is also transferred to the main bus bar 27 on the heat radiation side terminal 38 side of the heat pipe 31 due to the temperature difference with the main bus bar 27. The heat transferred to the main bus bar 27 is diffused by heat radiation from the surface or heat conduction from the support.

Further, the heat pipes 30 and 31 are connected to the conductor 23,
26, it does not affect the insulation distance to ground and does not restrict the arrangement of other equipment.

〔Effect of the invention〕

The heat absorbing side of the heat pipe is connected to the high temperature main circuit disconnection part and the conductor connection part at the automatic connection part with the electric equipment, and the heat radiation side is connected to the low temperature connection part of the conductor end inside the panel wall. This allows for efficient cooling of the hottest parts, eliminates the need for space for heat dissipation fins, and allows for a smaller panel size. In addition, since there is no need to provide ventilation holes in the panel and the panel can be sealed, it can be used even in adverse environments.Furthermore, since the interior can be completely partitioned, it is possible to prevent internal short circuits from spreading.

[Brief explanation of the drawing]

FIG. 1 is a side view of a closed power distribution board showing a conventional heat pipe arrangement, FIG. 2 is a side view of an embodiment of a closed power distribution board with a heat pipe arrangement according to the present invention, and FIG. 3 is a side view of a closed power distribution board showing a heat pipe used in the present invention. FIG. 4 is a partially enlarged detailed view of the wall bushing used in the present invention. 2... Circuit breaker, 20... Closed switchboard, 23,2
6... Conductor, 24, 25... Main circuit disconnection section, 3
0,31...Heat pipe.

Claims (1)

[Scope of Claims] 1. A closed power distribution board comprising a circuit breaker that connects and disconnects at a disconnection section in a box body, and a conductor that connects a connection section penetrating through the outer wall of the box body and the disconnection section, comprising: comprising a heat pipe disposed along the conductor with a side connected to a terminal of the disconnection section and a heat radiation side connected to a terminal of the connection section, and transporting heat from the disconnection section to the connection section; A closed switchboard featuring: