JP5719535B2 - Waterproof case - Google Patents

Description

  The present invention relates to a waterproof case suitable for an electrical junction box that is attached to, for example, an engine room of an automobile and accommodates electrical components such as fuses and relays.

  Cars are equipped with a wide variety of electrical equipment. In order to supply electric power to these various electric devices, an electric connection box is arranged in an appropriate position between the power source and the electronic device in the automobile. This electrical junction box is attached to an engine room or the like of the automobile, and is composed of a plurality of electrical parts such as connectors, relays, and fuses of a wire harness, and a waterproof case that accommodates these electrical parts. (See Patent Documents 1 and 2.)

  The waterproof case described above is waterproofed so that external water does not enter the interior of the vehicle during car washing or during rainy weather. However, if the waterproof case is completely sealed, when condensation occurs due to a temperature difference between the inside and outside of the waterproof case, the water accumulated in the waterproof case cannot be discharged to the outside. Or leakage current may flow.

  Therefore, conventionally, as shown in FIG. 6 and FIG. 7, a water drain hole 91 penetrating the inside and the outside of the lower cover 5 disposed vertically below the waterproof case is provided, so that water accumulated in the waterproof case is drained. It is discharged to the outside through the hole 91. Further, the lower cover 5 includes a peripheral wall portion 92 erected inward from the periphery of the drain hole 91, a ceiling wall portion 93 that continues to the inner edge of the peripheral wall portion 92 and covers the drain hole 91, and water An opening 94 penetrating the peripheral wall portion 92 is provided so as to be continuous with the punched hole 91.

  Thus, by providing the peripheral wall portion 92, the ceiling wall portion 93, and the opening 94 in the lower cover, water accumulated inside can be discharged to the outside through the opening 94 and the drain hole 91, and the outside water is drained. Even if it passes through the hole 91, it can be waterproofed so that it does not enter the waterproof case by being blocked by the peripheral wall portion 92 or the ceiling wall portion 93.

  By the way, in recent years, very high-pressure water is used in car washing. However, in the conventional waterproof case, when such very high-pressure water is sprayed and blown inward from the drain hole 91, the peripheral wall portion 92 and the ceiling wall portion 93 can sufficiently block the water. First, there is a problem in that, as shown by the arrow in FIG.

  In order to solve such a problem, for example, a drainage structure for an electrical junction box described in Patent Document 3 has been proposed. In addition to the drain hole 91 provided in the lower cover, the drainage structure of the electrical junction box includes a cylindrical connecting portion that is erected from the periphery of the drain hole 91 toward the outside of the waterproof case, and a connecting portion. And a cylindrical drainage portion having both ends opened along the horizontal direction.

  According to this electrical junction box, the water that tries to enter upward from the outside is blocked by the outer wall of the drainage section. In addition, since water entering the horizontal direction from the outside is discharged from one opening of the drainage portion to the other opening, it does not enter the waterproof case even when high-pressure water is sprayed. However, in the above-described drainage structure of the electrical junction box, since the connecting portion and the drainage portion protrude outside the waterproof case, there is a possibility of interfering with other components in the engine room.

JP 2002-354630 A JP 2005-185031 A JP 2006-254517 A

  Then, this invention makes it a subject to provide the waterproof case which can prevent the penetration | invasion to an inside reliably, even if high pressure water blows up from a drain hole.

The invention according to claim 1 for solving the above-described problem is a waterproof case for accommodating an electronic component, wherein a drain hole penetrating the inside and the outside of the waterproof case, and a peripheral edge of the drain hole from the periphery. A pair of drainage structures each including a peripheral wall portion to be provided, a ceiling wall portion that is continuous with an inner edge of the peripheral wall portion and covers the drainage hole, and an opening that is continuous with the drainage hole are provided, The opening is formed by removing a part of the peripheral wall portion from the drain hole forming portion of the waterproof case to the ceiling wall portion, and the pair of drainage structures are provided so that the openings face each other. It exists in the waterproof case characterized by having.

According to a second aspect of the invention, each of the pair of water draining structure, in a portion opposed to the opening of the peripheral wall portion, claim 1, wherein a taper approaching each other are provided toward the inner side Exists in the waterproof case described in 1 .

  As described above, according to the first aspect of the present invention, the high-pressure water blown inward from one drain hole of the pair of drain structures is advanced along the peripheral wall part or the ceiling wall part. It blows off from the opening of the drainage structure along the penetration direction of the opening. That is, it blows out toward the opening of the other draining structure. After the high-pressure water blown out from the opening of one drainage structure toward the opening of the other drainage structure enters the space surrounded by the peripheral wall portion and the ceiling wall portion from the opening of the other drainage structure as it is, Since it is discharged from the drain hole to the outside, even if high-pressure water is blown up from the drain hole, it can be surely discharged to the outside and prevented from entering the inside.

  According to the second aspect of the present invention, by providing a taper in a portion facing the opening of the peripheral wall portion, water blown up from the drain hole of one of the water draining structures proceeds along the taper of the peripheral wall portion, and the opening Since the flow is guided by the flow along the penetration direction, that is, the flow toward the opening of the other drainage structure, the water blown from the opening of the one drainage structure can be more reliably removed from the opening of the other drainage structure. And it can penetrate | invade in the space enclosed by a ceiling wall part, and can discharge | emit outside.

It is a perspective view which shows the electrical junction box comprised by the waterproof case which concerns on one embodiment of this invention. FIG. 2 is a perspective view showing a state where an upper cover is removed from a case main body of the waterproof case shown in FIG. 1. It is a perspective view which shows the lower cover of the waterproof case shown by FIG. FIG. 4 is a partially enlarged perspective view of the waterproof structure shown in FIG. 3. It is sectional drawing along the AA line in FIG. It is a fragmentary perspective view which shows an example of the lower cover which comprises the conventional waterproof case. It is sectional drawing along the BB line of FIG.

  Hereinafter, a waterproof case according to an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a perspective view showing an electrical junction box constituted by a waterproof case according to an embodiment of the present invention. FIG. 2 is a perspective view showing a state where the upper cover is removed from the case main body of the waterproof case shown in FIG. 1. 3 is a perspective view showing a lower cover of the waterproof case shown in FIG. FIG. 4 is a partially enlarged perspective view of the waterproof structure shown in FIG. FIG. 5 is a cross-sectional view taken along line AA in FIG.

  The waterproof case 1 according to the present embodiment constitutes an electrical junction box 10 shown in FIGS. The electrical connection box 10 is attached to an engine room of an automobile and houses a plurality of electrical components such as a power harness (hereinafter referred to as P / I) 8 as a connector, relay, fuse, and power distribution unit of a wire harness, These electrical components are electrically connected to a wide variety of electrical devices mounted on the automobile according to a predetermined pattern.

  Such an electrical junction box 10 includes a waterproof case 1 (FIG. 1) that forms an outline of the electrical junction box 10, the plurality of electrical components that are accommodated in the waterproof case 1, and the plurality of electrical components that are described above. And a cassette block 2 (FIG. 2) accommodated in a waterproof case 1 for holding components. That is, the waterproof case 1 of the present invention is a case for accommodating a plurality of electrical components and preventing liquids such as water from adhering to these electrical components.

  In addition, the term “waterproof” as used in the present invention is not limited to preventing entry of water, but means that it effectively acts on the entire liquid including water, oil, alcohol, etc. The description will be made using “waterproof” widely used as a name.

  The cassette block 2 described above is made of an insulating synthetic resin and is formed by a known injection molding. As shown in FIG. 2, the cassette block 2 is provided with a fuse box 21 in which a fuse is mounted, a mounting portion 22 in which a P / I 8 is mounted, and the like. The P / I 8 includes a board (not shown) on which fuses and relays are mounted and wiring patterns of these fuses and relays are formed.

  As shown in FIG. 1, the waterproof case 1 includes a case main body 3 that accommodates the above-described electrical components, an upper cover 4 that is detachably provided above the case main body 3, and a lower portion of the case main body 3. And a lower cover 5 detachably provided on the case body 3. The case body 3, the upper cover 4, and the lower cover 5 are made of an insulating synthetic resin and are formed by a well-known injection molding.

  Further, the vertical direction of the waterproof case 1 referred to in this specification refers to a direction along the arrow Y direction in FIGS. 1 to 5. The arrow Y direction indicates the direction in which the upper cover 4 is attached to the case body 3. Further, arrows X and Z in FIGS. 1 to 5 indicate orthogonal directions orthogonal to the vertical direction Y.

  As shown in FIG. 2, the case body 3 is provided in a substantially rectangular tube shape having openings on both sides in the vertical direction Y by a plurality of peripheral walls 31 extending along the vertical direction Y and continuing to each other. As shown in FIG. 1, the upper cover 4 includes a ceiling wall 41 facing the opening on the upper side in the vertical direction Y of the case body 3 and a peripheral wall erected from the outer edge of the ceiling wall 41 toward the lower side in the vertical direction Y. 42 and is formed in a box shape opened toward the lower side in the vertical direction Y, and is attached above the case body 3 so as to cover the opening on the upper side in the vertical direction Y of the case body 3.

  As shown in FIG. 1, the peripheral wall 31 of the case body 3 and the peripheral wall 42 of the upper cover 4 are provided with a plurality of lock portions 6 that fix the case body 3 and the upper cover 4 to each other. The lock portion 6 is provided with a locking receiving portion 61 having a U-shaped cross section that protrudes outward from the peripheral wall 31 of the case body 3 and a downward protrusion in the vertical direction Y from the peripheral wall 42 of the upper cover 4. And a lock arm 62 provided to be engaged with the engagement receiving portion 61 when inserted into an engagement hole formed between the peripheral wall 31 of the case body 3 and the engagement receiving portion 61. Has been.

  As shown in FIG. 3 and the like, the lower cover 5 includes a bottom wall 51 facing the opening on the lower side in the vertical direction Y of the case body 3 and a peripheral wall erected from the outer edge of the bottom wall 51 toward the upper side in the vertical direction Y. 52, and is attached to the lower side of the case body 3 so as to cover the opening of the case body 3 on the lower side in the vertical direction Y.

  Further, as shown in FIG. 1, a plurality of lock portions 7 that fix the case body 3 and the lower cover 5 to each other are provided on the peripheral wall 31 of the case body 3 and the peripheral wall 52 of the lower cover 5. The lock portion 7 is provided with a locking receiving portion 71 having a U-shaped cross section protruding outward from the peripheral wall 31 of the case body 3 and a protrusion protruding upward from the peripheral wall 52 of the lower cover 5 in the vertical direction Y. A lock arm 72 provided to be engaged with the engagement receiving portion 61 when inserted into an engagement hole formed between the peripheral wall 31 of the case body 31 and the engagement receiving portion 61. Yes.

  Further, as shown in FIGS. 3 to 5, a plurality of pairs of drainage structures 9 are provided on the bottom wall 51 of the lower cover 5 described above. The pair of drainage structures 9 are provided in the same size and the same shape. Each of the drainage structures 9 includes a drainage hole 91 that penetrates the bottom wall 51 of the lower cover 5, a peripheral wall portion 92 that is erected from the periphery of the drainage hole 91 toward the inside (that is, the upper side in the vertical direction Y), The ceiling wall portion 93 is connected to the inner edge portion of the peripheral wall portion 92 and covers the drain hole 91, and the opening 94 is formed so as to pass through the peripheral wall portion 92 so as to be continuous with the drain hole 91.

The pair of water draining structure 9 along the penetration direction of the opening 94 are arranged apart from each other, further, it is provided in the bottom wall 51 of the lower cover 5 as mutual opening 94 faces. More specifically, the drainage structure 9 on one side in the penetration direction is arranged with the opening 94 facing the other side in the penetration direction, and the opening 94 penetrates the drainage structure 9 on the other side in the penetration direction. It is arranged facing one direction.

  The drain hole 91 is a through hole that penetrates the inside and outside of the waterproof case 1 in the vertical direction Y, and is provided in a substantially square shape. The peripheral wall portion 92 is erected from three sides among the four sides constituting the peripheral edge of the substantially rectangular drain hole 91. That is, the peripheral wall portion 92 is erected in a U-shape when viewed from above so that the remaining one side of the four sides constituting the peripheral edge of the substantially rectangular drainage hole 91 becomes the opening 94.

  Further, portions of the peripheral wall portion 92 on both sides of the opening 94 are provided so as to be substantially perpendicular to the bottom wall 51 of the lower cover 5 and parallel to each other. On the other hand, the part which opposes the opening 94 of the surrounding wall part 92 pinched | interposed into the mutually parallel part is provided with the taper which approaches the opening 94 toward the upper side.

The opening 94 is provided such that the lower side in the vertical direction Y continues to the drain hole 91. In the present embodiment, the opening 94 is largely provided by removing all the peripheral wall portions 92 between the bottom wall 51 and the ceiling wall portion 93 of the lower cover 5 .

  As described above, by providing the waterproof case 1 with the pair of drainage structures 9, water generated in the waterproof case 1 due to condensation or the like collects in the lower cover 5 on the lower side in the vertical direction Y due to gravity, and the bottom of the lower cover 5 The water is discharged to the outside through the openings 94 and the water drain holes 91 of the pair of water drain structures 9 provided on the wall 51. Further, even if external water tries to enter the interior through the drain hole 91, if the pressure of the water is weak, it will be rebounded and blocked by the peripheral wall portion 92 and the ceiling wall portion 93, so that it will enter the inside of the waterproof case 1. There is nothing to do.

  The water pressure is strong, and as shown by the arrows in FIG. 5, water flows from the drain hole 91 of one of the pair of drain structures 9 (the drain structure 9 on the right side of the drawing in the example of FIG. 5) toward the inside. When blown up, the blown-up high-pressure water travels along the peripheral wall portion 92 and the ceiling wall portion 93 and is blown out from the opening 94 of one drainage structure 9 along the penetration direction of the opening 94. That is, it blows out toward the opening 94 of the other drainage structure 9.

  The high-pressure water blown from the opening 94 of the one drainage structure 9 toward the opening 94 of the other drainage structure 9 is directly surrounded by the peripheral wall portion 92 and the ceiling wall portion 93 from the opening 94 of the other drainage structure 9. After entering the space, it proceeds along the peripheral wall portion 92 and the ceiling wall portion 93 and is discharged to the outside through the drain hole 91. For this reason, even if high-pressure water is blown up from the drain hole 91, it can be surely discharged to the outside and prevented from entering the inside. The “high-pressure water” and “high-pressure water” referred to here are, for example, water and car wash liquid that are ejected vigorously from a high-pressure pump during car washing.

  Further, according to the above-described embodiment, by providing a taper at a portion facing the opening 94 of the peripheral wall portion 92, the water blown up from the drain hole 91 of the one drainage structure 9 becomes a taper of the peripheral wall portion 92. Therefore, the water blown out from the opening 94 of the one drainage structure 9 can be more surely guided by the flow along the penetration direction of the opening 94, that is, the flow toward the opening 94 of the other drainage structure 9. The other drainage structure 9 can enter the space surrounded by the peripheral wall portion 92 and the ceiling wall portion 93 from the opening 94 and discharge it to the outside.

  Moreover, according to embodiment mentioned above, since the drainage structure 9 is accommodated in the inside of the waterproof case 1 without protruding outside the waterproof case 1, there is no possibility of interfering with other components in the engine room.

  In addition, according to embodiment mentioned above, although provided in the taper in the part facing the opening 94 of the surrounding wall part 92, this invention is not limited to this. The peripheral wall portion 92 need not be tapered.

  Further, according to the above-described embodiment, the pair of drainage structures 9 are provided on the lower side of the waterproof case 1 in the vertical direction Y, but are provided on the lower cover 5, but the present invention is not limited to this. The pair of drainage structures 9 may be provided on the waterproof case 1, for example, on the peripheral wall 31 of the case body 3.

  Moreover, according to embodiment mentioned above, although the waterproof case 1 was comprised from the case main body 3, the upper cover 4, and the lower cover 5, this invention is not limited to this. The waterproof case 1 may be a box shape that can accommodate electrical components. For example, the case main body 3 is formed in a bottomed cylindrical shape, and the waterproof case 1 is provided with the case main body 3 and the upper without providing the lower cover 5. The waterproof case 1 may be constituted by the case body 3 and the lower cover 5 without providing the upper cover 4.

  Further, the above-described embodiments are merely representative forms of the present invention, and the present invention is not limited to the embodiments. That is, various modifications can be made without departing from the scope of the present invention.

1 Waterproof Case 9 Drainage Structure 91 Drainage Hole 92 Perimeter Wall 93 Ceiling Wall 94 Opening

Claims (2)

In a waterproof case that houses electronic components,
A drainage hole penetrating the inside and outside of the waterproof case, a peripheral wall portion standing inward from a peripheral edge of the drainage hole, and a ceiling wall portion connected to an inner edge of the peripheral wall portion and covering the drainage hole And a pair of drainage structures composed of openings connected to the drainage holes,
The opening is formed by removing a part of the peripheral wall portion from the drain hole forming portion of the waterproof case to the ceiling wall portion ,
The pair of drainage structures are provided so that the openings of each other face each other. 2. The waterproof case according to claim 1, wherein each of the pair of drainage structures is provided with a taper that approaches each other toward an inner side at a portion facing the opening of the peripheral wall portion.

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