JPS6333362B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an outdoor power distribution board, and is for suppressing a rise in the temperature of the air inside the outdoor power distribution board.

<Prior Art> The room temperature of a closed switchboard must be adjusted to below the allowable ambient temperature of the housed equipment in order to prevent malfunctions and shorten the service life of the housed equipment. Generally, the room temperature of an outdoor switchboard is determined by the amount of heat generated by storage equipment, lighting equipment, etc., and the balance between the amount of heat intrusion and heat radiation from the roof, door, side walls, and floor, which is determined from the room temperature and outside air conditions. For this reason, various measures have been conventionally taken to keep the temperature within the above range. Examples include (1) a structure with a double ceiling, and (2) a structure with a heat insulating material in the roof, side walls, or door to reduce the amount of heat entering from the outside.

<Problems to be Solved by the Invention> However, in the case of (1) above, it is mainly a measure to prevent condensation on the inner surface of the ceiling, and has little effect on reducing the amount of solar radiation entering. In addition, in single-layer structures such as side walls and doors other than the ceiling, a large amount of solar radiation enters from the steel plate surface that receives solar radiation. Furthermore, internal heat radiation is performed only from the steel plate surface that is not exposed to solar radiation. In the case of (2) above, the amount of solar radiation intrusion is reduced, but
At the same time, heat radiation from the inside is also reduced, so when a heat source is provided inside, the temperature rise of the internal air increases. In any case, the conventional example described above could not at all suppress the increase in internal temperature.

<Means for Solving the Problems> The present invention has been proposed in view of the above points, and in order to suppress the temperature rise of the internal air of the outdoor power distribution board, a heat insulating material is provided on the inner surface of the roof panel of the outdoor power distribution board. A ceiling board is provided inside the roof board at a distance from the roof board inner insulation material, and ventilation holes are provided in the front and back of the roof board, and an air layer is formed between the roof board internal insulation material and the ceiling board. communicates with the outside through the ventilation hole, and if at least one of the front and rear doors and left and right side walls is a front and rear door, a heat insulating material is pasted on the inner surface of the door, and the inner surface of the door is insulated. An inner wall is provided integrally with the door at a distance from the inner wall, and ventilation holes are provided on the upper and lower surfaces between the door and the inner wall, and an air layer is formed between the door inner surface insulation material and the inner wall. communicates with the outside through the ventilation hole, and in the case of the left and right side walls, a heat insulating material is pasted on the inner surface of the outer wall, and an inner wall is provided on the inner side at a distance from the inner wall heat insulating material, and the outer wall is connected to the outside through the ventilation hole. Ventilation holes are provided on the upper and lower surfaces between the wall and the inner wall, and the air layer formed between the inner wall insulation material of the outer wall and the inner wall is passed through the upper ventilation hole to the inner surface insulation material of the roof board and the air layer formed between the inner wall insulation material and the inner wall. It is characterized in that it communicates with the air layer between the ceiling plates and communicates with the outside via the lower ventilation hole.

<Function> As described above, the outdoor power distribution board of the present invention forms an air layer between the inner surface insulation material of the roof plate and the ceiling plate, and forms an air layer by making at least one of the front and rear doors and left and right side walls a double structure. With this configuration, the air space between the bottom ventilation hole between the outer wall and the inner wall, the air layer between the inner wall insulation of the outer wall and the inner wall, the top ventilation hole between the outer wall and the inner wall, and the roof The air layer between the inside insulation material of the board and the ceiling board - communicates with the outside through the ventilation hole on the front and back of the roof board, and the ventilation hole on the lower side between the front and back door and the inside wall - between the insulation material inside the door and the inside. The air layer between the walls is communicated with the outside through the upper ventilation hole between the door and the inner wall, and air circulation takes place through the aforementioned routes.

<Example> An example of the present invention will be described in detail with reference to FIGS. 1 to 4.

FIG. 1 is a partially sectional perspective view showing an embodiment of an outdoor power distribution board embodying the present invention, and this embodiment shows a case where the ceiling and the left and right side walls have a double structure.

1 is a roof board, 2 is a heat insulating material such as glass wool attached to the inner surface of the roof board 1, 3 is a ceiling board provided on the inside at a distance from the inner surface insulation material 2 of the roof board, 4 is an outside wall, and 5 is a A heat insulating material such as glass wool attached to the inner surface of the outer wall 4, 6 is a heat insulating material 5 on the inner surface of the outer wall.
7 is the front and back door, 8 is a heat insulating material such as glass wool attached to the inner surface of the door 7, and 9 and 10 are the upper parts between the outer wall 4 and the inner wall 6.・Ventilation holes 11 and 12 are provided at the front and back of the roof board 1, and ventilation holes 13 and 14 are equipped with filters provided at the top and bottom of the inner wall 6. The width and depth dimensions of the ceiling board 3 are the inner wall 6.
The width of the front and back doors 7 is approximately equal to the distance between the inner walls 6, respectively.

With this configuration, the roof board inner surface insulation material 2
An air layer is formed between the outer wall inner wall insulation material 5 and the inner wall 6, and an air layer is formed between the outer wall inner wall insulation material 5 and the inner wall 6, and the lower ventilation hole 10 between the outer wall 4 and the inner wall 6 - the outer wall inner surface. Air layer between insulation material 5 and inner wall 6 - outer wall 4
The upper surface ventilation hole 9 between the inner wall 6 and the inner wall 6 - the air layer between the inner roof board insulation material 2 and the ceiling board 3 - the ventilation holes 11 and 12 at the front and back of the roof board 1 communicate with the outside. Air circulation takes place along the route.

In addition, in the embodiment shown in FIG. 1, only the heat insulating material 8 is provided on the inner surface of the door 7, but in addition to this, an inner wall is provided integrally with the door 7 at a distance from the inner surface of the door heat insulating material 8. If it is formed into a rectangular cylindrical shape and ventilation holes are provided on the upper and lower surfaces between the door 7 and the inner wall, the ventilation holes on the lower surface between the door 7 and the inner wall and between the door inner surface insulation material 8 and the inner wall can be The air layer is communicated with the outside through the upper ventilation hole between the door 7 and the inner wall, and the air is circulated through the aforementioned route, further increasing the effect.

As mentioned above, in the embodiment shown in Fig. 1, the ceiling and left and right side walls have a double structure, and it has been stated that the effect will be further improved if the rear door is also made a double structure. The temperature rise in the air inside the switchboard is most severe in the summer when it is exposed to the afternoon sun, and for this reason it is quite effective to have a double structure on only one side wall or door facing west. rises. Therefore, when the left and right side walls have a double structure as in the embodiment shown in FIG. 1, it is effective to install these two sides facing east and west.

Next, a description will be given of the results of an experiment on the outdoor power distribution board of the embodiment shown in FIG. 1 in which the present invention was implemented.

FIGS. 2A to 2D are comparative graphs showing temperature gradients at various vertical locations of an outdoor switchboard. In addition,
This graph was taken at 5 o'clock in the morning on a sunny day in September.
These are the actual measured values at each time of the day, 3 o'clock, and 6 o'clock in the evening. A (dashed line) is when there is no heat source in the switchboard, B is
(dotted line) is when a 160W heater is placed on the floor board inside the panel, and C (solid line) is also 360W.
Each of the figures shows the case where the heater is placed in the energized state.

According to this graph, when there is a heat source (heater) inside the panel, the inner surface temperature of the ceiling plate 3 is lower than the temperature inside the panel both day and night. What this means is that the heat insulating material 2 placed on the inner surface of the roof board 1 suppresses the amount of solar radiation entering, and in addition to this, air flows between the air layer and the outside of the switchboard through the ventilation holes. This is because heat is radiated from the outer surface of the ceiling plate 3 toward the air layer. Furthermore, it has been demonstrated that even when there is no heat source inside the panel, the internal temperature of the ceiling board 3 does not become higher than the temperature inside the panel 1 cm directly below the ceiling panel 3.

FIG. 3 is a comparison graph showing the temperature gradient at each horizontal portion of the outdoor switchboard. Note that this graph is the actual measured value when one of the two outer walls of the switchboard is facing west, and the temperature measurement time is the same as in FIG. 2. According to this graph, the temperature of the inner wall 6 never becomes higher than the temperature inside the panel 1 cm away from the inner wall 6. What this means is that the heat insulating material 5 placed on the inner surface of the outer wall 4 suppresses the amount of solar radiation entering, and in addition to this, there is an air layer between the outer wall inner wall insulating material 5 and the inner wall 6 through the ventilation holes. This is because air is circulated between the outside of the switchboard and the outside of the switchboard, so that the temperature of the air layer does not become higher than the inner surface temperature of the inner wall 6, and heat is radiated from the outer surface of the inner wall 6 toward the air layer. . Furthermore, by covering the inner surface of the door 7 with a heat insulating material 8, there is an effect of suppressing the amount of solar radiation entering. Figures 4A and 4B are comparison graphs showing the temperature gradient during the daytime in the conventional example and in the case of the present invention, respectively, and it can be seen from this that when the present invention is used, the temperature inside the panel is extremely low and its effect is clearly visible. I understand.

<Effects of the Invention> As described above, according to the present invention, it is possible to reduce the amount of solar radiation entering the panel and to effectively dissipate heat inside the panel. It is also effective as a measure to prevent condensation on the inner surface of the inner wall. According to an embodiment of the present invention, even if a heater with a heat output of 360 W is placed inside the switchboard, the temperature rise inside the switchboard in summer can be reduced by 10°C.
It has been demonstrated that it can be done in {K} or less.

[Brief explanation of the drawing]

Fig. 1 is a partially sectional perspective view showing an embodiment of an outdoor power distribution board according to the present invention, Fig. 2 A to D are comparison graphs showing temperature gradients at various parts in the vertical direction, and Fig. 3 is a comparison graph at each part in the horizontal direction. It is a comparison graph showing the temperature gradient at . FIGS. 4A and 4B are comparison graphs showing daytime temperature gradients in the conventional example and in the case of the present invention, respectively. 1...Roof plate, 2,5,8...Insulation material, 3...
Ceiling board, 4...outer wall, 6...inner wall, 7...
Door, 9, 10, 11, 12...Ventilation hole, 13, 1
4...Ventilation hole with filter.

Claims (1)

[Claims] 1. A heat insulating material is pasted on the inner surface of the roof board of an outdoor power distribution board, a ceiling board is provided on the inside at a distance from the inner surface insulation material of the roof board, and ventilation holes are provided in the front and back of the roof board. , an air layer formed between the inner surface insulation material of the roof plate and the ceiling plate is communicated with the outside through the ventilation hole, and at least one of the front and rear doors and the left and right side walls has a structure that is compatible with the front and rear doors. In this case, a heat insulating material is pasted on the inner surface of the door, an inner wall is provided integrally with the door at a distance from the inner wall heat insulating material, and ventilation holes are provided on the upper and lower surfaces between the door and the inner wall. The air layer formed between the door inner surface insulating material and the inner wall is communicated with the outside through the ventilation hole, and in the case of the left and right side walls, a heat insulating material is pasted on the inner surface of the outer wall. An inner wall is provided inside the inner wall at a distance from the inner wall insulation material, and ventilation holes are provided on the upper and lower surfaces between the outer wall and the inner wall, and air is formed between the outer wall inner wall insulation material and the inner wall. An outdoor power distribution board characterized in that the layer is communicated with the air layer between the inner surface insulation material of the roof plate and the ceiling plate through the upper ventilation hole, and communicated with the outside through the lower ventilation hole. .