JP2008282981A - Waterproofing ventilation case equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve internal pressure release characteristics at assembling, allow maintenance/inspection of a filter, and prevent water from pooling on the outer surface of a case. <P>SOLUTION: A waterproofing ventilation case equipment 1 comprises a case 2 in which a case body 3 and a lid 4 are bonded together by using a heating type adhesive 7, with a circuit board 8 stored inside, ventilation holes 10 and 11 formed at least at two points of the case 2, and filters 12 and 13 so bonded as to close the ventilation holes 10 and 11 from the outside of the case 2, having waterproofing nature and ventilation nature. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a waterproof ventilation case device that can shorten the equilibration time of internal and external air pressure during assembly and prevents water from entering from the outside in a product state.

Conventionally, for example, there is a case device disclosed in Patent Document 1 as a case device having a waterproof structure and allowing ventilation. In this case, the case main body and the lid are joined via waterproof rubber. In the case body, one ventilation hole is formed from the viewpoint of waterproofing, and the ventilation hole is closed from the inner surface side of the case by a filter having waterproofness and air permeability.
JP-A-11-87944

  By the way, as a case device that can be ventilated with a waterproof structure, there is a waterproof ventilation case device used in a fuel control device of a vehicle. In this device, the case and the lid are bonded with an adhesive made of a thermosetting resin in order to enhance waterproofness. In this case, the temperature rise inside the case is abrupt with respect to the vehicle mounting environment, that is, the internal pressure suddenly rises. Here, when there is only one ventilation hole as in the conventional case, there is a problem that the ventilation area is small, the ventilation speed of the filter cannot catch up, and the lid is lifted. Further, if there is only one vent hole, there is a problem in that uneven heat dissipation is likely to occur inside the case during normal use, and it takes time to balance the internal and external air pressure. Furthermore, since the filter is bonded to the inside of the case, the filter must be tested for sealability before the case is integrated, and the filter cannot be serviced after the case is integrated. It was. Further, since the filter is bonded to the inside of the case, a recess is formed in the outer surface of the case by a vent hole, and water may accumulate in the recess.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to improve the internal pressure release characteristic at the time of assembly, to enable maintenance and inspection of the filter, and to prevent water from collecting on the outer surface of the case. The object is to provide a ventilation case device.

  According to the first aspect of the present invention, there is provided a structure in which vent holes are formed in at least two places of the case, and a waterproof and breathable filter is bonded to the outer surface of the case so as to close the vent holes. Therefore, when the case and the lid are bonded with a heating type adhesive, even if the internal temperature suddenly rises and the internal pressure suddenly rises, the case has a vent hole portion. Can be quickly released, the lid does not lift, and even when the temperature inside the case rises during normal use, the internal and external air pressure can be evenly balanced from at least two vent holes in the case. Is present on the outer surface of the case, the filter can be maintained at any time, and water droplets do not stay.

  In this case, a part of the case is constituted by a metal casing for cooling the circuit board, a counterbore hole and a screw insertion hole are formed in the casing, and a shield plate provided inside the case body is provided with the shield plate. The filter that is fixed to the housing with a screw that passes through a counterbore and a screw insertion hole, the counterbore hole and the screw insertion hole are also used as the vent hole portion, and closes the counterbore on the outer surface of the housing May be adhered (invention of claim 2).

If it does in this way, the counterbore hole and screw insertion hole for attaching the shield board for this housing | casing shield can be combined as said vent-hole part.
Further, the vent hole portion may be formed at a plurality of locations on the same surface portion of the case, and the plurality of vent hole portions existing on the same surface portion may be closed by a single filter (invention of claim 3). If it does in this way, the man-hour of filter installation can be reduced.

  Moreover, you may make it form the said vent hole part in a different surface part of a case (invention of Claim 4). In this way, product mounting restrictions are eliminated.

  Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows a waterproof ventilation case device 1 used in a vehicle fuel control device. The case 2 includes a case main body 3 and a resin lid 4. The case main body 3 includes a resin frame portion 5 and a heat radiating plate 6 that is a metal casing. A large number of heat radiating fin portions 6 a are formed on the heat radiating plate 6.

  The inner peripheral edge of the lower end of the frame part 5 is formed so as to be recessed in an approximately L shape, and the corner part 6b of the upper peripheral edge of the heat radiating plate 6 is fitted into the concave part 5a, and this part is used as a heat which also serves as a seal member Heat bonding is performed with an adhesive 7 (corresponding to a heating adhesive) made of a curable resin. The heat radiating plate 6 constitutes a part of the case 2.

  A circuit board 8 on which a fuel control circuit is formed is bonded to the upper surface (inner surface) of the heat radiating plate 6 so that heat can be transferred. On the side of the frame 5, the entire circumference of the resin case 9 that is integrated with a connector (not shown) that can be connected externally is fixed with an adhesive so as not to be immersed inside. A terminal (not shown) of the resin case 9 and a lead (not shown) of the circuit board 8 are connected, and a potting agent (not shown) is coated on the circuit board 8 to form a moisture-proof structure.

Further, a groove-like recess 5 b is formed around the entire upper end of the frame portion 5.
The lid 4 is formed with, for example, circular vent holes 10 and 11 at two locations. Filters 12 and 13 are formed on the outer surface of the lid 4 so that the vent holes 10 and 11 are respectively attached to the outer surface of the lid 4 (case). It is bonded in a form that closes from the outer surface. The filters 12 and 13 are made of a waterproof material and a breathable material (for example, Gore-Tex (registered trademark)). Moreover, the convex part 4a which fits the said recessed part 5b is formed in the lower surface peripheral part of this lid | cover 4. As shown in FIG.

  And the said convex part 4a of this cover 4 is engage | inserted by the recessed part 5b of the said frame part upper surface, and the adhesive agent 14 (equivalent to a heating type adhesive agent) of a thermosetting resin is arrange | positioned in this recessed part 5b, and this insertion is carried out. The parts are heat bonded by the adhesive 14.

  In this case, even if the temperature inside the case 2 suddenly rises and the internal pressure rises, the internal pressure can be quickly released from the two vent holes 10 and 11 of the case 2 and the lid 4 does not rise. In addition, in the completed state of FIG. 1, the seal test of the filters 12 and 13 can be performed. In this case, it is possible to inspect air leakage from the other filter part by introducing air from one filter part.

  According to the present embodiment, the vent holes 10 and 11 are formed in two places of the case 2, and the waterproof and breathable filters 12 and 13 are attached to the thermosetting resin before the bonding step. In order to achieve this, the air holes 10 and 11 are bonded or welded from the outer surface of the case 2 so that when the case 2 and the lid 4 are bonded to each other with the adhesive 7 made of a thermosetting resin, Even if the temperature rises sharply and the internal pressure rises rapidly, the vent holes 10 and 11 are provided at two locations of the case 2 and the air flow rate can be increased, so that the internal pressure is quickly released from the vent holes 10 and 11. The lid 4 does not lift up. In this case, since the filters 12 and 13 are finally bonded to the outer surface of the case 2, the bonding time of the filters 12 and 13 is arbitrary, and the filters 12 and 13 are bonded before the lid 4 is bonded to the case body 3. May not be attached, and in this state (the vent hole portions 10 and 11 are open), the above-described adhesive 7 can be heat-bonded. As a result, the internal pressure at the time of heat-bonding the adhesive 7 There will be no rise. Note that the filters 12 and 13 are bonded after the heat bonding.

  Further, even when the temperature inside the case 2 rises during normal use (during fuel control), the internal and external air pressure can be evenly balanced from at least two vent holes 10 and 11 of the case 2, and the filters 12 and 13 By being present on the outer surface of the case 2, the maintenance of the filters 12 and 13 can be performed at any time, and water drops do not stay.

  4 and 5 show a second embodiment of the present invention, which differs from the first embodiment in the following points. A counterbore 21 and a screw insertion hole 22 are formed, for example, at one location of the heat radiating plate 6. A shield plate 23 is provided inside the case body 3. The shield plate 23 includes a terminal connected to a ground terminal that forms a circuit. The shield plate 23 has a cylindrical portion 23a formed by burring corresponding to the screw insertion hole 22. An internal thread portion (not shown) is formed on the inner surface of the cylindrical portion 23a.

  The shield plate 23 is fixed to the heat radiating plate 6 by screwing a screw 24 through the counterbore 21 and the screw insertion hole 22 into the female screw portion of the cylindrical portion 23a. In this case, the counterbore hole 21 and the screw insertion hole 22 are also used as a vent hole portion. The lid 4 is provided with one vent hole 10 and one filter 12. Therefore, two vent holes are provided.

  And the filter 25 which obstruct | occludes the counterbore hole 21 is adhere | attached on the said heat sink 6 outer surface. According to the second embodiment, the countersink hole 21 and the screw insertion hole 22 for attaching the shield plate 23 for shielding the heat sink 6 are used as the vent holes by the heat sink 6 for cooling the circuit board 8. Can be combined.

  FIG. 6 shows a third embodiment of the present invention, which differs from the first embodiment in the following points. That is, in the third embodiment, the vent holes 31 and 32 are formed at a plurality of locations on the same surface portion of the case 2, for example, the lid 4, and the plurality of vent holes 31 and 32 existing on the same surface portion are provided as one. The filter 33 is closed by adhesion or welding at the outer periphery of each of the vent holes 31 and 32. According to the third embodiment, similar to the first and second embodiments, there are the same effects as configuring a plurality of filters, and the number of steps for attaching the filter 33 can be reduced.

  In this case, as shown in FIG. 7 showing the fourth embodiment of the present invention, the vent holes 34 and 35 are formed in different surface portions of the case 2, and the filters 36 and 37 are provided in the vent holes 34 and 35, respectively. It is good also as a structure, and according to this, the mounting direction restrictions of a product are eliminated.

  In addition, this invention is not limited to each above-mentioned Example, In the range which does not deviate from a summary, it can change suitably and can implement. For example, in addition to the fuel control device, the present invention can be widely applied to all case devices that require waterproofing and ventilation. Moreover, as a filter, what is necessary is just waterproof and breathable. Furthermore, various types of heating adhesives are possible.

1 is a longitudinal side view of a waterproof ventilation case device showing a first embodiment of the present invention. Vertical side view of the waterproof ventilation case device before the lid is attached Top view of the lid FIG. 1 equivalent view showing a second embodiment of the present invention. Vertical side view of screw mounting part FIG. 1 equivalent view showing a third embodiment of the present invention. FIG. 1 equivalent view showing a fourth embodiment of the present invention.

Explanation of symbols

  In the drawings, 1 is a waterproof ventilation case device, 2 is a case, 3 is a case body, 4 is a lid, 5 is a frame part, 6 is a heat sink (housing), 7 is an adhesive (heating type adhesive), 8 is Circuit boards 10 and 11 are vent holes, 12 and 13 are filters, 14 is an adhesive (heating type adhesive), 21 is a counterbore, 22 is a screw insertion hole, 23 is a shield plate, 24 is a screw, 31 , 32 are vent holes, 33 is a filter, and 34, 35 are vent holes.

Claims (4)

A case configured by adhering a case main body and a lid with a heating type adhesive and containing a circuit board therein;
A vent hole formed in at least two places of the case;
A waterproof ventilation case device comprising: a waterproof and breathable filter that is bonded in a form that closes the ventilation hole portion from the outer surface of the case. A part of the case is constituted by a metal casing for cooling the circuit board,
Provided with a shield plate that shields the housing inside the case body,
A counterbore and a screw insertion hole are formed in the housing,
The shield plate is fixed to the housing with a screw through a counterbore and a screw insertion hole,
The counterbore hole and the screw insertion hole also serve as the vent hole part,
The waterproof ventilation case device according to claim 1, wherein the filter that closes the counterbore is bonded to the outer surface of the housing.   The waterproof ventilation according to claim 1 or 2, wherein the ventilation holes are formed at a plurality of locations on the same surface of the case, and the plurality of ventilation holes on the same surface are closed by a single filter. Case device.   The waterproof ventilation case device according to any one of claims 1 to 3, wherein the ventilation hole portion is formed in a different surface portion of the case.

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