JPH0541317U - Ventilation structure of distribution box - Google Patents

Abstract

(57) [Summary] [Purpose] Prevents rain from entering the distribution box and ventilates the distribution box. In a ventilation structure of a distribution box 1 for accommodating an electric device such as a switch installed on a road or the like, at least a part of an upper portion of the distribution box 1 is provided with an opening A through a stepped portion 8, and the stepped portion is provided. A ventilation plate 6 having a ventilation hole 6b formed through the periphery of the opening A corresponding to 8 is formed so as to be positioned above the step portion 8,
The distribution box 1 includes a top plate 2 that covers the peripheral portion of the opening A and the ventilation plate 6.
It is attached to the case body of the above, and an air flow passage B communicating with the outside of the distribution box is formed between the top plate 2 and the opening A and the ventilation hole 6b, and the ventilation hole 6b of the ventilation plate is used for insect and dust prevention. The net 12 is placed. Thus, when it rains, the air flow passage B is covered from above by the top plate 2, so that the rain does not enter the switchboard 1.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a ventilation structure for a distribution box that houses electric devices such as switches installed on the road.

[0002]

[Prior Art]

 Conventional ventilation systems for on-road distribution boxes include a pair of gallery on the upper and lower sides of the distribution box. There is a ventilation system to prevent dew condensation on the inner wall of the distribution box and to improve the durability or reliability of the distribution box and switches.

[0003]

[Problems to be solved by the device]

 However, when a gallery is provided on the upper side surface of the above-mentioned conventional distribution box, there is a problem that rain penetrates from the gallery and leads to a decrease in the durability and reliability of not only the distribution box but also the switch etc. there were.

An object of the present invention is to provide a ventilation structure for a distribution box that can prevent rain and the like from entering the distribution box and can ventilate the inside of the distribution box.

[0005]

[Means for Solving the Problems]

 The present invention relates to a ventilation structure for a distribution box that houses electric devices such as switches installed on the road, etc., and an opening is provided in at least a part of the upper part of the distribution box through a step part to correspond to the step part. A ventilation plate with a ventilation hole is formed so as to extend from the periphery of the opening so that it is positioned above the step, and the top plate that covers the periphery of the opening and the ventilation plate is attached to the case body of the distribution box. The gist of the invention is to form an air flow path communicating with the outside of the power distribution box between the top plate and the opening and the ventilation hole, and disposing an insect and dustproof net in the ventilation hole of the ventilation plate. .

[0006]

[Action]

 According to the present invention configured as described above, air is discharged from the lower part of the distribution box by convection to the outside from the upper opening of the main body case to the outside between the top plate and the opening and through the air flow passage including the ventilation port. The inside is ventilated.

Further, when it rains, the airflow passage is covered with the top plate from above, so that the rain does not enter the switchboard.

[0008]

【Example】

 Hereinafter, an embodiment in which the present invention is embodied in a distribution box installed on the road will be described with reference to FIGS.

The distribution box 1 is composed of a box-shaped top plate 2, a frame body 3 formed in a rectangular parallelepiped shape, and an outer plate 4 covering three side surfaces of the frame body 3. A switch (not shown) and the like are housed in the switchboard 1. An opening / closing door 5 is provided at the front position of the distribution box 1 so that it can be opened and closed.

Next, the ventilation means of the distribution box 1 will be described in detail. In the outer plate 4 of the distribution box 1, louvers 7 are provided on the lower portions of both left and right side surfaces. (Only one side is shown in FIG. 1) The louver 7 is fixed with a plurality of blades 7a extending obliquely downward, and ventilation holes 7b are provided between the blades 7a. An unillustrated insect and dustproof net 12 is arranged on the inner surface of the gallery 7.

In the outer plate 4 of the distribution box 1, a rectangular frame-shaped step portion 8 is formed around the upper periphery of the outer plate 4, and a vertical wall 8 a is formed above the inner edge of the step portion 8. Then, by being surrounded by the vertical wall 8a, an opening A is formed in the upper portion of the outer plate 4. A ventilation plate 6 is attached to the vertical wall 8a so as to correspond to the step portions 8 on the left and right sides in the upper portion of the distribution box 1.

The ventilation plate 6 is formed in an L-shaped cross section by a flat plate portion 6a and a mounting piece 6c which is vertically erected from one side of the flat plate portion 6a, and is attached to the vertical wall 8a by the mounting piece 6c. Are fastened and fixed by a pair of bolts 9 and nuts 10. Reference numeral 11 is a washer which is inserted into the bolt 9 in the nut 10 and the mounting piece 6c. A plurality of ventilation holes 6b are formed in the flat plate portion 6a in the longitudinal direction.

Insect-proof and dust-proof nets 12 are stretched on the flat plate portion 6a so as to cover the respective ventilation holes 6b. A pair of fixing plates 13 are placed on both sides in the longitudinal direction of the net 12, and a bolt 19 inserted into the fixing plate from below the flat plate portion 6a is fastened to a nut 20 via a washer 21. , The net 12 is attached to the ventilation plate 6.

The periphery of the ventilation plate 6 excluding the attachment piece 6 c is surrounded by a channel-shaped enclosure plate 14. Both ends of the enclosure plate 14 are fixed to the vertical wall 8a by a pair of bolts 22 and nuts 23 via washers 24. A packing 15 is attached to the inner surface of the top plate 2 and arranged so as to be able to contact the upper edge of the vertical wall 8a and the upper edge of the enclosing plate 14 except for the portion corresponding to the ventilation plate 6. Has been done. A gap is formed between the opening A and the top plate 2, the gap and the ventilation hole 6b of the ventilation plate 6, and between the peripheral wall 2a and the step portion 8 extending downward around the top plate 2. The air flow passage B is formed by the gap formed by the above.

Next, the operation of the ventilation structure of the distribution box thus configured will be described. For ventilation in the distribution box 1, the outside air G enters the distribution box 1 from the ventilation hole 6b of the ventilation plate 6 of the air flow passage B through the net 12 and is discharged from the ventilation hole 7b of the louver 7. For example, it enters the distribution box 1 through the ventilation hole 7b of the louver 7 and is discharged from the ventilation hole 6b of the ventilation plate 6 through the net 12. Then, the outside air G is introduced into the distribution box 1 to eliminate the temperature difference in the outside air and prevent dew condensation on the inner wall surface of the outer plate 4. In addition, insects and dust that have entered through the ventilation holes 6b of the ventilation plate 6 are prevented from entering the distribution box 1 by the net 12.

As described above, in the ventilation structure for the distribution box of the present embodiment, by mounting the ventilation plate 6 on the inner peripheral portion of the distribution box 1, it is possible to prevent rain and the like from entering the distribution box 1. Besides, the durability of the distribution box 1 and the switch etc. can be improved.

Further, by attaching the net 12 to the ventilation hole 6b of the ventilation plate 6, it is possible to prevent insects, dust, and the like from entering the distribution box 1. Further, since the packing 15 is provided on the circumference of the surrounding plate 14, the outside air G can be surely ventilated from the ventilation hole 6b of the ventilation plate 6 through the net 12, and insects and dust can be caught from other places. Etc. will not invade. (Other Embodiment) Next, another embodiment will be described with reference to FIG. The same components as those in the above embodiment are designated by the same reference numerals and the description thereof will be omitted.

A baffle plate 16 extending in the vertical direction is provided in a protruding manner on the step portion 8 between the top plate 2 and the surrounding plate 14. A passage portion 17 having a U-shaped cross section is formed around the baffle plate 16, and the outside air G passes through the passage portion 17 and is ventilated in the same manner as in the above embodiment. Therefore, the baffle plate 16 can further enhance the effect of preventing rain, insects, dust, etc. from entering the distribution box 1.

The present invention is not limited to the above-described embodiment. For example, in the above-described embodiment, although the ventilation holes 6b of the ventilation plate 6 are provided in nine circular shapes, the number of ventilation holes 6b or Regardless of the shape, most of the flat plate portion 6a of the ventilation plate 6 may be transparently provided.

[0020]

[Effect of the device]

 As described above in detail, according to the ventilation structure of the distribution box of the present invention, it is possible to prevent rain and the like from entering the distribution box and to ventilate the inside of the distribution box.

[Brief description of drawings]

FIG. 1 is a perspective view of a distribution box in this embodiment.

FIG. 2 is likewise a front view showing how the ventilation plate is attached.

FIG. 3 is a sectional view showing a mounting state of the ventilation plate below the packing.

FIG. 4 is a sectional view showing a baffle plate according to another embodiment.

[Explanation of symbols]

1 distribution box, 2 top plate, 6 ventilation plate, 6b ventilation hole, 8 steps, 1
2 nets, A opening, B air flow passage.

Claims (1)

[Scope of utility model registration request] 1. A ventilation structure of a distribution box (1) for accommodating electrical equipment such as a switch installed on a road or the like, wherein at least a part of an upper part of the distribution box (1) is provided with a step (8). A ventilation plate (6) provided with an opening (A) and having a vent hole (6b) penetrating the periphery of the opening (A) corresponding to the step (8) is positioned above the step (8). A top plate (2) that is formed to extend to cover the peripheral portion of the opening (A) and the ventilation plate (6) is attached to the case body of the distribution box (1), and the top plate (2) and the opening (A) are attached. And an air hole (6b) form an air flow path (B) communicating with the outside of the distribution box, and the ventilation plate (6b) of the ventilation plate has a net (12) for insect and dust protection.
Ventilation structure of the distribution box, which is characterized by arranging.