JPS6011694Y2 - closed switchboard - Google Patents

Description

[Detailed description of the invention] This invention relates to a closed switchboard, which has a boiling cooling type heat pipe for cooling the internal temperature rising part, and utilizes the phase conversion cycle of the working fluid to efficiently transfer heat outside the panel. It relates to closed switchboards that discharge.

Closed switchboards, which functionally house monitoring and control equipment such as meters, switches, and relays, and main circuit equipment such as circuit breakers, disconnectors, and busbars, are widely used due to their functionality and safety.

Recently, with the increase in the capacity of power equipment, the capacity of closed switchboards has been increased, and solving various problems caused by internally generated heat has become an extremely important issue.

The problems with the conventional closed switchboard will be explained based on FIG.

In general, closed switchboards are designed to prevent electrical shocks and the spread of accidents in the event of arcing within the panel, and are designed to connect supervisory control equipment and main circuit equipment, and between main circuit equipment, such as bus conductors 8 and breaker 9, and cables between them. 10 is separated by a partition wall 1.

Therefore, there is a limit to the ventilation inside the panel, and even if heat pipes 11 are used for cooling, if the heat dissipation fins 12 are located inside the panel as shown in the figure, heat will be trapped inside and the cooling effect will not be effective. I can't wait.

Therefore, conventionally, in order to increase capacity, a blower was installed to perform forced cooling.

However, waist fans were noisy and had reliability problems.

The purpose of this invention is to create a highly reliable closed power distribution board that can efficiently release the heat generated inside by using boiling cooling type heat pipes with excellent heat transfer properties to cool areas where the internal temperature rises. Our goal is to provide the following.

Next, the present invention will be explained according to an embodiment shown in the drawings.

FIG. 2 shows the installed state of the heat pipe, and FIG. 3 shows the configuration of the heat pipe.

As shown in Fig. 3, the heat pipe is roughly divided into a cylindrical cooling section 2, an insulating section 4, and a loose flexible joint 5.
, are connected together, an insulating working fluid is sealed therein, a flexible heat transport insulating tube 7 is provided, and one end is connected to a condenser 6 provided outside the panel as shown in FIG. It is.

Here, one end of the heat transport insulating tube 7 opens in the condenser 6 at a position away from the pipe communication section to the cooler 2, and the other end is near the inner bottom surface of the cylindrical cooling section 2. Open to.

Further, the condenser 6 provided outside the panel is made of metal with good thermal conductivity, and its bottom surface is brought into close contact with the panel ceiling surface.

Furthermore, the cooling section 2 is made of a material with good conductivity, and serves both as a bus conductor section and a working fluid boiling section.

A case where, for example, Freon is used as the working fluid in the above configuration will be described below.

The cooling unit 2, which forms part of the bus conductor 8, generates heat when energized.

When the heat density of the inner surface increases and enters the high heat density nucleate boiling region, fluorocarbon is vaporized on the heat transfer surface, and these bubbles rise up the outside of the heat transport insulating tube 7 and collect in the condenser 6.

The condenser 6 is installed outside the panel, and its bottom surface is in contact with the metal exterior of the panel, so the heat generated inside is
Heat is radiated directly to the outside air from the outer cover of the condenser 6, and is also transmitted to the outside of the panel, and is also radiated to the outside air from the outside of the panel, which has a large area.

Therefore, the freon vapor rising from the cooling section 2 is cooled and liquefied.

Further, in the cooling unit 2, liquefied Freon is refluxed from the condenser 6 via the heat transport insulating tube 7 in an amount equal to the amount evaporated by heating.

Here, one end of the heat transport insulating pipe 7 opens at a relatively low temperature part in the condenser 6, that is, at a position away from the pipe communication part to the cooling section 2, so that the relatively low temperature liquefied fluorocarbon is returned to the cooling section 2, which is a heat source, and efficiently cools this section.

In this way, a natural circulation closed loop is formed and smooth heat transport is performed.

Furthermore, since the present device has an insulating section 4 interposed therebetween, and Freon, which has good insulation properties, is used as the working fluid 3, there is no problem in terms of insulation or installation space.

In addition, a flexible joint in the shape of a rainbow or rosette is inserted in the middle of the conduit that makes up the heat pipe, so that it can be moved up and down due to earthquakes, etc.
Even if vibration is applied in the left and right direction, it can be effectively absorbed.

Furthermore, dimensional errors during on-site assembly can be absorbed.

Although a sufficient cooling effect is normally obtained by this method, it is also possible to further enhance the cooling effect by performing forced cooling of the condenser 6, such as air cooling or water cooling.

As mentioned above, according to the present invention, the boiling cooling method provides an extremely superior effect compared to the conventional cooling method using natural convection, is highly reliable, does not cause any problems with noise, and can be closed. It is extremely effective for downsizing and increasing capacity of switchboards.

[Brief explanation of drawings]

FIG. 1 is an equipment layout diagram of a conventional switchboard, FIG. 2 is an equipment layout diagram showing an embodiment of a closed switchboard according to the present invention, and FIG. 3 is a configuration diagram of a heat pipe used in the invention. 1... Partition wall, 2... Cooling section, 3...
...Working fluid, 4...Insulation section, 5...
・Flexible joint, 6... Condenser, 7... Flexible heat transport insulating tube, 8... Bus bar, 9... Storage breaker.

Claims (1)

[Scope of utility model registration request] In a closed switchboard with electrical equipment housed in a metal case, there is a cylindrical cooling section that also serves as a part of the main circuit conductor, and a condenser that communicates with this cylindrical cooling section through an insulating tube. The condenser is installed outside the panel, and an insulating working fluid is sealed therein, and a heat transport insulated pipe liquid transport body is provided along the longitudinal direction of the inside. A closed power distribution board characterized in that a part of the is joined to the outer surface of the casing.