JPH0936568A - Water stop structure of box cover - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water stop structure of a box cover, which is capable of discharging water droplets that stay in a groove and stopping water droplets from penetrating into the inner space of a box cover. SOLUTION: A water stop structure is composed of multiple walls 10 which are made to fit alternately in each other between a box main body 2 and a cover 3, wherein a drain hole 8 is provided to a groove 6 formed by the multiple walls 10, and a pressing projection 14 extending downwards corresponding to the drain hole 8 is provided to an insertion wall 12 of the cover 3 inserted into the groove 6. The opening 9 of the drain hole 8 communicating with the outside is provided at a level lower than the base 7 of the groove 6, and the lower end of the pressing projection 14 is extended up to the inside of the drain hole 8. Furthermore, a water avoiding member 15 is provided to partially stop up the opening.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a box cover stopper which covers a box body to form a drip-proof space in the box body to prevent water and the like from entering the box body. Regarding water structure.

[0002]

2. Description of the Related Art A box body such as a fuse box or a joint box which has been used to house electric parts mounted on an automobile or the like has been provided with various stoppers in order to protect the electric parts housed therein from water and the like. A water structure is formed. For example, the one disclosed in Japanese Utility Model Publication No. 4-111223 is known.

As shown in FIG. 9, a conventional water blocking structure 51 is
It is provided in a fitting portion between the box body 52 and the cover 53 fitted in the box body 52. That is, the box body 52
An outer wall 54 having a low height and an inner wall 55 higher than the outer wall 54 are doubly formed around the periphery of the. Then, as shown in FIG. 10, a trough-shaped groove portion 56 is formed by the outer wall 54 and the inner wall 55, and an appropriate number of drainage holes 58 are provided in the groove bottom surface 57 of the groove portion 56. On the other hand, a box skirt 59 is provided below the outer wall 54, and a short inner skirt 60 is provided below the inner wall 55. Also,
A barrier 61 is provided on the outside of the upper part of the box skirt 59 so as to project outward.

The inner peripheral surface of the outer peripheral wall 62 of the cover 53 is provided so as to fit with the outer peripheral surface of the inner wall 55. Further, a cover skirt 63 is provided so as to extend continuously from the lower end of the outer peripheral wall 62 so as to project outward. The inner peripheral surface of the cover skirt 63 is provided so as to fit with the outer peripheral surface of the outer wall 54. A discharge port (not shown) that communicates with the outside is provided at the lower inside of the box skirt 59.

In the above structure, when the electrical component 70 such as the relay box is first mounted on the box body 52 and then the cover 53 is fitted, the waterproof structure of the box cover is inevitably formed. That is, since a minute fitting gap is formed between the cover skirt 63 and the outer wall 54 and between the inner wall 55 and the outer peripheral wall 62 of the cover 53, the multiple wall 64 is provided between the box body 52 and the outside of the cover 53. To form a labyrinth structure.

In this fitted state, for example, when water droplets are sprayed from the outside on the lower left in FIG. 9, the barrier 61 first prevents most of the water droplets from entering. Further, the small fitting gap between the cover skirt 63 and the outer wall 54 prevents water droplets from entering the groove portion 56. Then, the water droplets that have penetrated into the groove portion 56 are
It collects on the top and is drained to the outside through the drain hole 58 along the inside of the box skirt 59. Further, the inner wall 55 and the outer peripheral wall 6
The small fitting gap between the two prevents water droplets from penetrating from the groove 56 into the internal space 65 of the box body 52 and the cover 53. Therefore, the water droplets sprayed from the outside do not enter the internal space 65 in which the electric component 70 is mounted.

[0007]

However, in the above-mentioned conventional water blocking structure 51 for a box cover, even if infiltrated water droplets are collected in the groove portion 56, the groove bottom surface 57 has a constant height, so There is a problem that it is difficult to drain the water from the hole 58 to the outside. Further, when the lower end surface of the outer peripheral wall 62 of the cover 53 has a constant height, the water that has penetrated into the inner wall 55 due to surface tension
It adheres as the adhered water 80 on the entire peripheral surface between and. Then, there is a problem that a pressure difference is generated due to a temperature difference between the cover 53 and the inside space 65, the attached water 80 is sucked up, and a water droplet enters the inside space 65.

The object of the present invention has been made in view of the above-mentioned problems, and the water droplets accumulated in the groove are easily discharged from the drain hole, and the water droplets do not penetrate into the inner space of the cover. It is to provide a waterproof structure for a box cover.

[0009]

SUMMARY OF THE INVENTION The above object of the present invention is to prevent water in a box cover having multiple walls alternately fitted between the box body and the cover, and a drainage hole formed in the groove formed by the multiple walls. In the structure, it is achieved by a water blocking structure for a box cover, characterized in that a pressing protrusion protruding downward is provided on the insertion wall on the cover side inserted into the groove corresponding to the drain hole. be able to.

Further, the above object can be achieved by the opening of the drainage hole to the outside being provided one step lower than the groove bottom surface of the groove portion, and the lower portion of the pressing projection extending into the drainage hole. .

Further, the above object can be achieved by providing a water avoiding member for closing a part of the opening to the outside of the drain hole.

[0012]

[Operation] According to the water blocking structure for a box cover having the above-mentioned structure according to the present invention, a pressing protrusion protruding downward corresponding to the drainage hole is provided on the insertion wall on the cover side inserted into the groove. It is provided. Therefore, when the cover is fitted on the box body, the pressing projection of the insertion wall is arranged on the water drain hole, so that the minute gaps generated by the multiple walls are increased and the box body and the cover of the water drop from the outside are increased. Surely prevent invasion into the internal space. Further, since the pressing projection guides the water droplets accumulated in the groove portion to the water drain hole, the water droplets can be reliably drained from the water drain hole to the outside.

Further, the opening to the outside of the water drain hole is provided one step lower than the groove bottom surface of the groove portion, and the lower part of the pressing projection extends into the water drain hole. Therefore, the water droplets collected in the groove portion can be transmitted to the pressing protrusion and reliably guided to the drainage hole which is one step lower than the bottom surface of the groove to be drained to the outside from the drainage hole.

Further, since the water avoiding member for closing a part of the opening to the outside of the water drain hole is provided, it is possible to reliably prevent the water droplets blown from the outside from directly entering the groove. Therefore, it is possible to more reliably prevent the water droplets blown from the outside from entering the inner space of the box body and the cover.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a water blocking structure for a box cover of the present invention will be described in detail below with reference to FIGS. 1 is a partial perspective view showing a first embodiment of a water blocking structure for a box cover of the present invention, FIG. 2 is an exploded perspective view in FIG. 1, FIG. 3 is a sectional view taken along line AA in FIG. 2, and FIG. 2 is a sectional view taken along line BB in FIG. 2, FIG. 5 is a sectional view taken along line CC in FIG.
FIG. 6 is a partial sectional view showing a second embodiment of the water blocking structure for a box cover of the present invention, FIG. 7 is a sectional view taken along the line D-D in FIG.
FIG. 8 is a sectional view taken along line EE in FIG.

As shown in FIGS. 1 to 5, a water blocking structure 1 for a box cover is formed by a multiple wall 10 between a box body 2 and a cover 3 fitted on the box body 2. That is, the outer wall 4 and the inner wall 5 of the same height are doubly provided around the box body 2, and the outer wall 4 and the inner wall 5 form a gutter-shaped groove portion 6. A proper number of drain holes 8 are provided on the bottom surface 7 of the groove portion 6. Further, at the lower end of the outer peripheral wall 11 of the cover 3, there is provided an insertion wall 12 which is inserted between the outer wall 4 and the inner wall 5 with a minute gap left therebetween. Further, a cover skirt 13 is fitted on the outer circumference of the insertion wall 12 with the outer wall 4 leaving a minute gap.
Are installed around.

The water drain hole 8 is arranged one step lower than the groove bottom surface 7 of the groove portion 6, and corresponds to the water drain hole 8 in the insertion wall 12 on the cover 3 side inserted into the groove portion 6. A pressing protrusion 14 is provided at this position and extends into the water drain hole 8. Further, a water avoiding member 15 is provided in the opening 9 to the outside of the water draining hole 8 for preventing intrusion of water droplets from the outside. This water avoidance member 15
Has a triangular cross section in order to accurately remove water droplets sprayed from below and to widen the inside of the water drain hole 8 so that water droplets can easily drop. Then, in order to further cover the drain holes 8, the pressing protrusions 14 and the outside of the water avoiding member 15, a part of the outer wall 4 is hung so that the outer wall protrusions 1
6 are formed.

In the above structure, first, electrical components such as a relay box are mounted in the box body 2 and then the cover 3 is fitted to inevitably form the waterproof structure 1 for the box cover. . That is, since a small fitting gap is formed between the cover skirt 13 and the outer wall 4 and between the inner wall 5 and the insertion wall 12 of the cover 3, the box body 2 and the cover 3 are formed.
A labyrinth structure is formed by the multiple walls 10 between the inside and the outside.

Further, for example, when water droplets are sprayed from diagonally lower left in the drawing in FIG. 3 or FIG. 4, first, the minute fitting gap between the cover skirt 13 and the outer wall 4 enters the groove portion 6 of the water droplets. To prevent ingress of. Then, the water droplets that have entered the groove portion 6 accumulate on the groove bottom surface 7 and are drained to the outside from the opening portion 9 via the drain hole 8 and the side of the water avoiding member 15. Furthermore, the minute fitting gap between the inner wall 5 and the insertion wall 12 reliably prevents the infiltration of water droplets from the groove 6 into the internal space of the box body 2 and the cover 3.

Therefore, it is possible to reliably prevent the water droplets sprayed from the outside from entering the internal space in which the electric parts are mounted, and to reliably drain the water droplets accumulated in the groove portion 6 without using packing or the like. Since it can be discharged from the hole to the outside, the work efficiency can be improved due to the simplification of the sealing work, and the reliability of the box body and the cover can be improved.

Next, a second embodiment of the present invention will be described with reference to FIGS. The water stop structure 31 for the box cover in the second embodiment differs from the water stop structure 1 for the box cover in the first embodiment described above in that the drain holes 32 are provided.
Is provided at the same height as the groove bottom surface 7 of the groove portion 6, and the water avoiding member 33 is provided above the drain hole 32. Therefore, the lower end of the pressing protrusion 34 hanging from the lower end surface of the insertion wall 12 at a position corresponding to the drain hole 32 stops above the water avoiding member 33 and is not extended into the drain hole 32. Since the other parts are the same as those in the first embodiment, the description thereof will be omitted by giving the same reference numerals to those in the first embodiment.

In the above structure, since the pressing projection 34 hangs above the drainage hole 32 in the insertion wall 12, surface tension is applied to the fitting gap between the insertion wall 12 and the inner wall 5. The water droplets adhered by are transmitted to the pressing protrusions 34, are dropped on the side end of the water avoiding member 33, and are discharged to the outside from the water drain hole 32. Therefore, the water droplets dropped in the groove portion 6 will not be sucked up into the inner space of the box body 2 and the cover 3 and enter. Further, as shown in FIG. 6, when the chamfered portion 35 is provided on the upper edge of the drain hole 32, it becomes easier to discharge the water droplets from the drain hole 32.
Further, most of the water droplets sprayed from below the outside are prevented from entering through the drain hole 32 by the water avoiding member 33.

As described above, also in the second embodiment, the water droplets blown from the outside are surely discharged to the outside without entering the inner space of the box body 2 and the cover 3, and the structure is simple. By increasing the number of drain holes 32, drainage can be further facilitated. Therefore,
The reliability of the box body and the cover is improved, and the cost can be reduced.

The present invention is not limited to the above-described embodiment, but can be implemented in other modes by making appropriate changes. For example, the shape of the water avoiding member 15 in the above embodiment is a triangular cross section or a rectangular cross section, but it may be a semicircular cross section or a trapezoidal cross section. Further, if the pressing protrusion 14 is deeply extended to the lower portion of the drainage hole 8, the water avoiding member 15 may be omitted.

[0025]

As described above, according to the water blocking structure for a box cover of the present invention, the pressing wall protruding downward corresponding to the water drain hole is inserted into the insertion wall on the cover side inserted into the groove. Protrusions are provided. Therefore, it is possible to reliably prevent water droplets blown from the outside from entering the inner space of the box body and the cover with a simple structure, and it is possible to reliably drain the water droplets accumulated in the groove portion to the outside from the drain hole. . Therefore, the reliability and workability of the box body and the cover are improved, and the cost can be reduced.

The opening of the drainage hole to the outside is provided one step lower than the groove bottom surface of the groove portion, and the lower part of the pressing protrusion extends into the drainage hole. Therefore, the water droplets collected in the groove portion can be transmitted to the pressing protrusion and reliably guided to the drainage hole which is one step lower than the bottom surface of the groove to be drained to the outside from the drainage hole. Therefore, it is possible to more reliably prevent the water droplets blown from the outside from entering the inner space of the box body and the cover, and further improve the reliability of the box body and the cover.

Further, since the water avoiding member for closing a part of the opening to the outside of the water drain hole is provided, it is possible to reliably prevent the water droplets blown from the outside from directly entering the groove. . Therefore, it is possible to more reliably prevent water droplets sprayed from the outside from entering the internal space inside the box body and the cover, and it is possible to further improve the reliability of the box body and the cover.

[Brief description of drawings]

FIG. 1 is a partial perspective view showing a first embodiment of a water blocking structure for a box cover of the present invention.

FIG. 2 is an exploded perspective view of FIG.

FIG. 3 is a sectional view taken along line AA in FIG. 2;

FIG. 4 is a sectional view taken along line BB in FIG.

FIG. 5 is a sectional view taken along the line CC in FIG.

FIG. 6 is a partial cross-sectional view corresponding to FIG. 5, showing a second embodiment of the water blocking structure for a box cover of the present invention.

FIG. 7 is a sectional view taken along line DD in FIG. 6;

FIG. 8 is a sectional view taken along the line EE in FIG. 6;

FIG. 9 is a partial perspective view showing an example of a conventional water blocking structure for a box cover.

FIG. 10 is a plan view showing a drain hole in FIG. 9.

[Explanation of symbols]

 1,31 Box cover waterproof structure 2 Box body 3 Cover 4 Outer wall 5 Inner wall 6 Groove 7 Groove bottom 8,32 Drain hole 9 Opening 10 Multi-wall 12 Insertion wall 13 Cover skirt 14,34 Holding protrusion 15 , 33 Water avoidance member

Claims (3)

[Claims] 1. A water blocking structure for a box cover, wherein the box body and the cover are alternately fitted to each other, and the groove formed by the wall has a drain hole. The cover is inserted into the groove. A water blocking structure for a box cover, characterized in that a pressing protrusion projecting downward is provided on the insertion wall on the side corresponding to the drain hole. 2. An opening to the outside of the drainage hole is provided one step lower than a groove bottom surface of the groove portion, and a lower portion of the pressing protrusion extends into the drainage hole. Item 1. A waterproof structure for a box cover according to item 1. 3. The water blocking structure for a box cover according to claim 1, further comprising a water avoiding member for closing a part of an opening of the water draining hole to the outside.