JP3216791B2 - Drainage structure of electronic unit box - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention is an electronic unit box to be mounted on a vehicle or the like, to a drainage structure of an electronic unit box with improved drainage.

[0002]

Description of the Prior Art FIG. 7 We as Japanese Patent Application No. 8-98698
It is a longitudinal cross-sectional view which shows the electronic unit box which each proposed earlier . The electronic unit box 100 mainly includes a housing case 11 that houses the electronic unit 1, a box body 12 that houses the housing case 11, and a box cover 13 that seals the box body 12.
An air layer 10a is formed between the side wall of the housing case 11 and the side wall of the box body 12, and the air layer 1a is formed.
Air inlet 10b and air outlet 10c communicating with
Is provided. Although not shown, a blocking wall provided in the air layer 10a, are allowed to reach the air discharge port 10c through the air intake air longest flow path flowing in from the inlet 10b.

According to such an electronic unit box 100, the cooling air entering the air layer 10a from the air inlet 10b bypasses the air layer 10a and passes through the air outlet 10a.
Since it escapes to c, the inside of the electronic unit box 100 can be cooled effectively.

[0004]

[0007] The electronic unit box 100 of No. said Hei 8-98698 shown in FIG. 7, the main purpose of improving its heat dissipation property, you have not focused for drainage . Box body 1 for waterproofing
2 and box cover 13 at the joint
d, but the seal packing 12d
If the unit is not properly mounted or damaged,
Invading water reservoir in the housing case 11 in the 2, since Ru danger that the electronic unit 1 breaks down, reforming it
I needed to do better.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned demands , and it is possible to effectively drain water that has entered a housing case of an electronic unit, and to reliably and easily prevent a failure due to flooding of the electronic unit. An object of the present invention is to provide a drainage structure of an electronic unit box that can be prevented.

[0006]

According to a first aspect of the present invention, there is provided a drainage structure for an electronic unit box , comprising: a housing case for housing an electronic unit; a box body for housing the housing case ; Storage case and bock
An electronic unit box comprising an air space formed between the storage case and the storage case , wherein the storage case has a first drainage channel formed therein.
And forming a second drainage channel in the box body,
The first drainage channel is configured to penetrate the second drainage channel.
did.

According to such a configuration, in a housing case of an electronic unit, by any chance, even when water enters, the water that accumulated in the accommodating case is drained from the first drain passage is not Na. This makes it possible to reliably and easily prevent a failure caused by water in the electronic unit.

Further, the inside of the storage case and the box book
Both water in the body can be drained directly to the outside, more
Drainage can be performed effectively. Also, the first
Since the drainage channel passes through the second drainage channel, the second
Air leakage from the drain can be minimized.
This makes the air flow in the air layer smooth
And the cooling effect of the electronic unit can be enhanced.
Wear.

[0009] drainage structure of the electronic unit box according to claim 2, wherein the first drainage path of the accommodating case, the box because it is configured to penetrate the bottom wall of the body, directly water entering into the housing case The water can be drained out of the box main body, and quick drainage is possible.

According to a third aspect of the present invention, the drainage structure of the electronic unit box has a configuration in which ribs protrude radially from an outer peripheral wall of the first drainage channel and / or an inner peripheral wall of the second drainage channel.

[0011] In this construction, between said front Symbol first drainage channel second drainage, can always secure a clearance, side walls forming the first drain passage is decentered by a high temperature or the like Even in this case, the drainage of the second drainage channel can be maintained.

According to a fourth aspect of the present invention, one of the outer shape of the first drainage channel and the inner shape of the second drainage channel is polygonal and the other is circular. and the case, without providing a radial rib to said first drainage channel, it is possible to obtain the same effect as the drainage structure of the electronic unit box according to claim 3, wherein.

The polygon constituting the outer shape of the first drainage channel or the inner shape of the second drainage channel is preferably a rectangle.
This is because the rectangular shape can increase the opening area of both the first and second drainage channels.

According to a fifth aspect of the present invention, when the joint between the storage case and the box main body is welded, the water from the joint between the storage case and the box main body is formed. Intrusion of water can be reliably prevented, and intrusion of water into the air layer can be reliably prevented.

[0015] The present invention is claimed in claim 5, in particular, the first drain passage formed in the housing case, it is effective when a not penetrate constitutes the bottom wall of the box body.
Since there is no intrusion of water into the air layer, the air layer → the
This is because the backflow of water into the first drainage channel → the storage case can be prevented.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a drainage structure for an electronic unit box according to the present invention will be described below with reference to the drawings. First, the drainage structure of the electronic unit box according to the first embodiment of the present invention will be described. FIG. 1 is a longitudinal sectional view showing a drainage structure of an electronic unit box according to the first embodiment of the present invention.

The drainage structure of the electronic unit box according to the present embodiment has a first drainage passage formed in a housing case of the electronic unit, a second drainage passage formed in a box body, and the first drainage passage is formed by the second drainage passage. It is configured to penetrate the drainage channel. The present embodiment, electron Japanese Patent Application 8-98698 previously proposed by the unit box 100
(See FIG. 7) is a configuration to which the drainage structure of the present invention is applied, and also has a heat dissipation structure which is a feature of the electronic unit box 100.

In FIG. 1, the present electronic unit box 1
0 is a housing case 11 mainly for housing the electronic unit 1.
A box body 12 for housing the housing case 11,
A box cover 13 for sealing the box body 12 is provided. An air layer 10a is formed between the side wall of the housing case 11 and the side wall of the box body 12, and an air inlet 10b and an air outlet 10c communicating with the air layer 10a are provided.

On the bottom wall of the housing case 11, a nozzle-shaped first drainage passage 11a communicating from the inside of the case to the outside is formed integrally in a hanging state. On the other hand, box body 1
A second drainage channel (drainage hole) 12a through which the first drainage channel 11a penetrates is formed in the bottom wall 2. Second drainage channel 12a
Communicates with the outside from the air layer 10a in a gap with the first drainage channel 11a penetrating therethrough.

The lower end opening (not shown) of the first drainage channel 11a penetrating the second drainage channel 12a is located below the bottom surface A of the box body 12. In addition, by making the central axes of the first drainage channel 11a and the second drainage channel 12a coincide with each other, the second drainage channel 12a (gap) is uniformly formed around the nozzle-shaped peripheral wall of the first drainage channel 11a. It is like that.

In this embodiment, the second drainage channel 12a
Is a hole, but may be a nozzle shape surrounding the first drainage channel 11a.

FIG. 2 is an enlarged view of a dashed line in FIG. As shown in FIG.
b and the joint B between the opening periphery 12b of the box body 12 are welded to each other.
To prevent water from entering.

Also, as shown in FIG.
Is supported by the pedestal 12c, and the bottom wall of the housing case 11 is floated from the bottom wall of the box body 12. According to such a configuration, the cooling air flowing in the air layer 10a can cool the entire side wall and the bottom wall of the housing case 11, thereby achieving more effective heat radiation of the electronic unit 1. Can be.

According to the drainage structure of the electronic unit according to the present embodiment having such a configuration, the box body 1 may be damaged due to improper installation or breakage of the seal packing 12d.
Even if water invades into the inside 2, water in both the storage case 11 and the air layer 10a can be directly drained to the outside, and quick and effective drainage can be performed.

The first drainage channel 11a is connected to the second drainage channel 12a.
a, air leakage from the second drainage channel 12a can be minimized. Thereby, the flow of air in the air layer 10a becomes smooth, and the cooling effect of the electronic unit 1 can be enhanced.

Further, since the lower end opening of the first drainage channel 11a penetrating through the second drainage channel 12a is located below the bottom surface A of the box main body 12, it accumulates in the air layer 10a as shown in FIG. Water does not flow back into the storage case 11. Thereby, complete waterproofing of the electronic unit 1 can be achieved.

In addition, when the joint B between the housing case 11 and the box body 12 is welded, it is possible to more reliably prevent water from entering the air layer 10a.

Next, the drainage structure of the electronic unit box according to the second embodiment of the present invention will be described. FIG. 4 is a cross-sectional view of a first drainage channel and a second drainage channel which are main parts of a drainage structure of an electronic unit box according to a second embodiment of the present invention.

The drainage structure of the electronic unit box according to the present embodiment has a configuration in which four ribs 111, 112, 113, and 114 project radially from the outer peripheral wall of the first drainage channel 11a.

As shown in FIG. 6, if the outer shape of the first drainage channel 11a and the inner shape of the second drainage channel 12a are both circular,
When the electronic unit box 10 is disposed under a high temperature such as in an engine room, the high temperature may cause the first drainage channel 11a to be eccentric. In such a case, the second drainage channel 12a is blocked by the outer peripheral wall of the first drainage channel 11a, and water accumulates in the air layer 11a, resulting in a decrease in the cooling effect.

Therefore, as in the present embodiment, the four ribs 111, 11 are radiated from the outer peripheral wall of the first drainage channel 11a.
With the configuration in which the 2, 113 and 114 are protruded, a gap can always be secured between the outer peripheral wall of the first drainage channel 11a and the inner peripheral wall of the second drainage channel 12a, and the second drainage channel 12a
Drainage can be maintained.

The ribs 111, 112, 113, 11
Even if 4 is formed on the inner peripheral wall of the second drainage channel 12a, a gap between the outer peripheral wall of the first drainage channel 11a and the inner peripheral wall of the second drainage channel 12a can be ensured in the same manner as described above.

As shown in FIG. 5, the first drain 11
In the case where the outer shape of a is a polygon and the inner shape of the second drainage channel 12a is a circle, the ribs 111, 11
The same effect as in the case where 2, 113 and 114 are provided can be obtained. Further, the same effect can be obtained when the outer shape of the first drainage channel 11a is circular and the inner shape of the second drainage channel 12a is polygonal, contrary to FIG.

Here, the polygon constituting the outer shape of the first drainage channel 11a or the inner shape of the second drainage channel 12a is preferably a rectangle (quadrangle). It is also possible to use a triangle or a pentagon or more polygon. It is. With the rectangular shape as shown in FIG. 5, both the opening areas of the first and second drainage channels 11a and 12a can be increased.

The drainage structure of the electronic unit box according to the present invention is not limited to the above embodiments.

For example, the above embodiment relates to our proposal.
That before Kitokunegaitaira 8-98698 Patent electronic unit box 100 but is an application of the drainage structure of the present invention (see FIG. 7), not limited to this, the drainage structure of the present invention, various configurations It can be applied to existing electronic unit boxes. However, as in the above embodiment, Japanese Patent Application No. 8-98
If the drainage structure of the present invention is applied to the electronic unit box 100 of No. 698, it is possible to improve both heat dissipation and drainage.

The first drainage channel 11a is connected to the box body 1
2, the water that has entered the storage case 11 can be directly drained to the outside without providing the second drain hole 12a.

Further, the housing case 11 and the box body 1
2 can be reliably prevented from invading water into the air layer 10a, so that the first drain 1
Even if 1a does not penetrate the bottom wall of box body 12 ,
Chi, even if the lower end opening of the first drain passage 11a is positioned above the bottom wall of the box body 12, no water can flow back into the first drainage path 11a from housing case 11, the electronic unit 1
Can be protected from water.

[0039]

According to the drainage structure of the electronic unit box of the present invention, in the first aspect of the present invention, the electronic unit box is provided.
If water enters the knitted storage case,
The water is drained from the first drainage channel and
Will not accumulate. Thereby, the electronic unit
Failures due to flooding can be reliably and easily prevented.
You.

Further, the inside of the storage case and the box book
Both water in the body can be drained directly to the outside, more
Drainage can be performed effectively. Also, the first
Since the drainage channel passes through the second drainage channel, the second
Air leakage from the drain can be minimized.
This makes the air flow in the air layer smooth
And the cooling effect of the electronic unit can be enhanced.
Wear.

According to the second aspect of the present invention,
Water that has entered the storage case is directly
Water can be quickly drained.

According to a third aspect of the present invention, the configuration
Always maintain a gap between the first drain and the second drain
And the side wall forming the first drainage channel has a high temperature or the like.
Even if eccentricity occurs, the drainage of the second drainage
Can be maintained.

As set forth in claim 4, the first drainage channel.
Either the outer shape of the
If the other is circular, the first drainage channel
4. The electron according to claim 3, wherein a radial rib is not provided.
The same effect as the drainage structure of the unit box can be obtained.
it can.

The storage case according to claim 5,
When the joint of the box body is welded
From the joint of the storage case and the box body
Water can be reliably prevented from entering, and
Intrusion of water can be reliably prevented.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a drainage structure of an electronic unit box according to a first embodiment of the present invention.

FIG. 2 is an enlarged view showing a joint between a housing case of the electronic unit box shown in FIG. 1 and a box body.

FIG. 3 is an enlarged view showing first and second drainage channels of the electronic unit box shown in FIG. 1;

FIG. 4 is a cross-sectional view of a first drainage channel and a second drainage channel which are main parts of a drainage structure of an electronic unit box according to a second embodiment of the present invention.

FIG. 5 shows another modification of the drainage structure of the electronic unit box of the present invention, and is a cross-sectional view of a first drainage channel and a second drainage channel.

FIG. 6 is a cross-sectional view of a first drainage channel and a second drainage channel for comparison with a drainage structure of an electronic unit box according to a second embodiment.

[Fig. 7] We have previously proposed as Japanese Patent Application No. 8-98698.
It is a longitudinal cross-sectional view which shows the electronic unit box.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electronic unit 10 Electronic unit box 10a Air layer 11 Housing case 11a First drainage channel 12 Box body 12a Second drainage channel

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H02G 3/08 B60R 16/02 610 H05K 5/02

Claims (5)

(57) [Claims] An accommodating case for accommodating an electronic unit;
A box body that houses the housing case, the receiving cable
An electronic unit box having an air space formed between the storage case and the box body , wherein the storage case has a first
Forming a drainage channel and a second drainage channel in the box body;
Forming the first drainage channel penetrates the second drainage channel
A drainage structure for an electronic unit box, wherein the drainage structure is configured as described above . 2. The drainage structure for an electronic unit box according to claim 1, wherein the first drainage passage of the storage case penetrates a bottom wall of the box body. 3. The outer peripheral wall of the first drainage channel and / or
Drainage structure of the electronic unit box according to claim 1, wherein is protruded ribs radially from the inner peripheral wall of the second drainage path. 4. The drainage structure of the the outer shape of the first drainage either the inner shape of the second drainage well as a polygon, an electronic unit box according to claim 1, wherein the other is circular. 5. The drainage structure of the electronic unit box according to any one of claims 1 to 4, welded joints with the housing case the box body.