JPH08264334A - Self-cooled electrical equipment - Google Patents

Abstract

PURPOSE: To provide a self-cooled electrical equipment which is equipped with a heat radiator as an annex to an electrical equipment main body, wherein the heat radiator is simple in structure, enhanced in heat dissipating effect, and lessened in size. CONSTITUTION: A self-cooled electric equipment is composed of an electric equipment main body 2 filled with insulating medium such as insulating oil, gas or the like, heat radiators 3 which are mounted on the outer side of the electric equipment main body 2 and where insulating medium is circulated, and a bracing piece 12 fixed extending under the heat radiators 3, where vent holes 13 are provided to the bracing piece 12, and cooling air is easily made to flow over all the peripheral surfaces of the heat radiators 3 through the intermediary of the vent holes 13 provided to the bracing piece 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric device such as an oil-filled / gas-filled transformer, and more particularly to a heat radiation structure for a self-cooling electric device equipped with a radiator.

[0002]

2. Description of the Related Art There is a conventional self-cooling type electric device in which a radiator is provided around an electric device such as a transformer or a reactor. Hereinafter, an example of the conventional self-cooling electric device 1 will be described with reference to FIGS. 4 to 6. For example, the electric oil main body 2 configured in the reactor is filled with insulating oil and heated by operation. Is circulated through a plurality of radiators 3 attached to the outer side surface of the electric device body 2 to radiate heat.

In such an electric device, both the electric device main body 2 and the radiator 3 are large and heavy, and therefore, at the time of installation, steel materials 5 are laid vertically and horizontally on the lower surface of the electric device main body 2 at appropriate intervals. The main body 2 of the electric device is placed on the upper part thereof. In addition, in the radiator 3, the steady rest metal fittings 6 are straddled over the plurality of radiators 3 in order to prevent damage due to rolling vibration such as an earthquake. Has been done. The steady rest 6 is connected to and supported by the support fitting 4 fixed to the steel material 5 installed on the lower surface of the electric device body 2 by bolts and nuts.

The structure of the radiator 3 is indicated by reference numeral 3 in the lower right of FIG.
As shown in b, it is composed of a heat dissipation fin,
The radiator 3 and each radiator 3 are connected to each other by pipes 7 at upper and lower portions. Then, the insulating oil in the electric device body 2 flows from the inside of the electric device body 2 to the radiator 3 through the pipe 7 as shown by an arrow A in FIG. At this time, when the temperature of the insulating oil rises due to the use of the electric device 1, the ambient temperature of the radiator 3 rises and rises, so that the outside air is sucked in from the lower portion of the radiator 3 as shown by an arrow B, and the insulation The heat of oil is dissipated.

[0005]

In such a conventional self-cooling electric device 1, the flow of outside air between the radiating fins of each radiator 3 is provided on the lower surface of the electric device body 2. The steel materials 5 and the steady rests 6 act so as to block the flow path of the outside air and are hindered, and as shown by an arrow B in FIG. 5, the radiators 3 located outside the electric device body 2 side and the opposite side. Although the flow rate of the outside air that blows between the fins is secured, the flow rate and speed of the outside air that blows between the fins of each radiator 3 located on the electric device body 2 side are small, and the heat dissipation effect is low. Therefore, in the conventional self-cooling type electric device, the radiator 3 is configured to be large in order to enhance the heat dissipation effect, which in turn makes the self-cooling type electric device 1 as a whole large in size and high in cost. There were various problems such as

The present invention has been made in view of the above problems, and provides a self-cooling electric device in which the heat dissipation effect of the radiator attached to the main body of the electric device is enhanced with a simple structure, and the radiator is further miniaturized. The purpose is to

[0007]

The above object of the present invention is to provide a main body of an electric device filled with an insulating medium such as insulating oil or gas, and a plurality of electric devices which are attached to an outer side surface of the main body of the electric device and in which the insulating medium circulates. And a heat-sink fitting fixed to the lower part of each radiator across the plurality of radiators,
This is achieved by providing a self-cooling electric device in which a ventilation hole is provided in the steady rest.

[0008]

According to the above construction of the present invention, when the ambient temperature of the radiator rises and the outside air is sucked from the lower portion of the radiator, the outside air can be sucked through the ventilation holes formed in the steady rest fitting. The outside air flows through almost the entire circumferential surface of the heat dissipation fin of the radiator, thereby increasing the heat dissipation effect of the radiator. Therefore, it is possible to further reduce the size of the radiator, downsize the self-cooling electric device, and reduce the installation area and cost with the downsizing of the electric device.

[0009]

Embodiments of the present invention will be described below with reference to FIGS. FIG. 1 is an enlarged side view showing a main part structure of a self-cooling type electric device of an embodiment of the present invention, FIG. 2 is a perspective view showing a configuration of a steady rest, and FIG. 3 is a side view showing a cooling action.
Note that the same portions are denoted by the same reference numerals throughout the drawings.

The self-cooling electric device 11 shown in FIG.
4 shows the connection between the electric device body 2 and the radiator 3 by the pipe 7, the assembly structure of the support fitting 4 and the steel material 5 supporting the radiator 3, the fixing structure of the radiator 3 and the steady rest 12 and so on. It is similar to the conventional example shown in FIG. 6 and its detailed description is omitted to avoid duplication.

As shown in FIG. 2, the steady rest 12 has a U-shaped cross section, but a plate-like connecting portion 12c for connecting the upper flange 12a and the lower flange 12b is appropriately provided in the longitudinal direction. Vent holes 13 are formed at intervals. When assembled to the electric device main body 2, the metal fittings (hereinafter
It is called a "fixing bracket". ) 3a is tightened by bolts 14 and nuts to be connected and fixed. Further, the fixing to the support fitting 4 is performed by tightening bolts and nuts using the lower flange 12b.

The steady rest 12 thus constructed
Since the vent holes 13 are formed, even if the steady rest fitting 12 is installed so as to connect the bottom portions of the radiators 3 and support the weight of the radiators, this installation blocks the gas flow path. This is no longer the case. Therefore, as shown by the arrow A in FIG. 3, insulating oil flows from the electric device body 1 to the radiator 3
When the ambient temperature of the radiator 3 rises and the outside air is sucked up by the channel indicated by the arrow B, a channel indicated by the arrow b, that is, a channel passing through the ventilation hole 13 is newly formed, and the radiator 3 The heat exchange becomes active over almost the entire circumferential surface of the and the heat dissipation effect increases.

Since the heat radiation effect of the radiator 3 is increased, the precision of the heat radiation design can be improved, and the radiator 3 can be miniaturized to reduce the cost. Further, due to the miniaturization of the radiator 3, the self-cooling electric device 1
1, the installation area can be reduced, various advantages such as effective use of the site in the factory and easy layout when installing other various facilities can be obtained. It should be noted that although the above embodiment describes the heat dissipation of insulating oil as the insulating medium, the object of heat dissipation is not limited to insulating oil and may be gas. Also,
The support fitting may be fixed to the steel material installed on the lower surface of the electric device body by welding.

[0014]

As described above, according to the present invention, the insulating medium such as the insulating oil or gas filled in the main body of the electric device is made to flow into the radiator and is circulated to the main body of the electric device to radiate heat. At this time, outside air easily flows through almost all the circumferential surface of the heat dissipation fin of the heat radiator through the ventilation hole formed in the bottom of the heat radiator to prevent the heat radiation of the heat sink from being installed in the steady fitting. The heat dissipation effect of the radiator is enhanced. Therefore, the heat radiation accuracy of the radiator can be improved and the size can be reduced, and the self-cooling electric device can be downsized, and the installation area and the cost can be reduced with the downsizing of the electric device.

[Brief description of drawings]

FIG. 1 is an enlarged side view of essential parts showing the configuration of a self-cooling electric device that is an embodiment of the present invention.

FIG. 2 is a perspective view of a main part showing a configuration of a steady rest.

FIG. 3 is a side view of a self-cooling electric device showing a heat radiation effect.

FIG. 4 is a plan view showing a configuration of a conventional self-cooling electric device.

FIG. 5 is a side view showing the configuration and heat dissipation action of a conventional self-cooling electric device.

FIG. 6 is an enlarged side view of a main part showing a configuration of a conventional self-cooling electric device example.

[Explanation of symbols]

 2 Electric equipment main body 3 Radiator 3a Fixing metal fitting 4 Support metal fitting 5 Steel material for installation 7 Pipe 11 Self-cooling electric equipment 12 Steady metal fitting 13 Vent hole 14 Bolt A Insulating oil recirculation path B, b Air flow path

Claims (1)

[Claims] 1. An electric equipment main body filled with an insulating medium such as insulating oil or gas, a plurality of radiators attached to the outer side surface of the electric equipment main body and circulating the insulating medium, and the plurality of radiators. A self-cooling electric device comprising: a steady-state metal fitting fixed to the lower part of each radiator, and a vent hole provided in the steady-state metal fitting.