JPH0132788Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention is for storing electrical equipment, indicating instruments, etc. in a case, and particularly relates to the airtight structure of the case.

Conventional devices of this type will be explained using electrical equipment as an example. Printed circuit boards that connect and arrange electronic circuit components, which are electrical devices, are generally housed in a rigid case made of metal or other materials for the purpose of protection from external flying objects, or are kept watertight, depending on the surrounding environment in which they are installed. Generally, the device is housed in a sealed case with a waterproof gasket interposed therebetween.

For example, a conventional printed circuit board storage and fixing device having a waterproof structure will be described with reference to FIG.

A lower case 1 and an upper case 2 made of rigid metal are tightened and fixed in a watertight manner with a gasket 3 interposed therebetween, and a parts storage space is formed inside. A support section 1A on which a printed circuit board 4 is placed is provided upright from the bottom of the lower case 1, and the printed circuit board 4 is fixed onto this support section 1A by screws or the like.

According to the above-mentioned conventional structure, a gasket 3 made of flexible rubber or the like that matches the abutment area of each case 1, 2, in this case, the circumference of each case 1, 2, is arranged, and the case 1, 2 is It is tightened and fixed with screws or caulking to provide airtightness. In this case, the softer the packing 3, the more difficult it is to align the packing 3 with the rims of the cases 1 and 2.
It is difficult to assemble it in the proper position, and if it is accidentally tightened and fixed while the assembly position has shifted, airtightness may be lacking.

Therefore, in order to avoid this problem, adhesive is applied to at least one of the cases 1 and the packing 3
It is conceivable to place the case 1 in an appropriate position and temporarily hold the gasket 3 on the circumference of the case 1, and then cover the case 2 with the other case 2 and tighten and fix it. However, if the assembly position of the gasket 3 is incorrectly aligned, it takes time and effort to correct the problem, resulting in poor workability.

This idea allows the cases to be assembled and fixed in an airtight state extremely easily without causing the above-mentioned problems, and the gaskets placed at the abutting points of the upper and lower cases can be used to inject adhesive. By providing a hole and applying adhesive to this hole position to temporarily hold at least one side of the case and the gasket, the gasket can be easily assembled and held, and the airtightness between each case can be maintained well. This is what I did.

Embodiments of this invention will be described below based on the accompanying drawings.

2 and 3 show an embodiment of this invention, in which a printed circuit board 10 for connecting and arranging electronic circuit components, which are electrical equipment, is installed in a lower case 11 and an upper case 12 made of metal or the like. At least one, in this embodiment, the lower case 11
A printed circuit board 10 is fixedly held in place via screws or the like.

In addition, the peripheral flange 11A of each of the cases 11 and 12,
A gasket 13 is interposed between the case 12A and the gasket 13 to maintain airtightness between the cases 11 and 12.

Holes 14 for injection of adhesive are formed in the packing 13 at appropriate intervals.

According to the above configuration, after the printed circuit board 10 on which the circuit components are connected and arranged is fixed to the lower case 11,
The packing 13 is arranged along the peripheral flange 11A of the lower case 11. Next, by applying or pouring the adhesive S into the 14 holes provided in the packing 13, the adhesive S is applied to the peripheral flange 11 of the lower case 11.
It solidifies while penetrating between A and Patsukin 13,
As a result, the gasket 13 is adhesively held on the peripheral flange 11A of the lower case 11, and the gasket 13 can be temporarily fixed to the lower case 11 side in an appropriate state. In addition, in this case, if the viscosity of the adhesive S is low, the peripheral flange 11A of the lower case 11 and the gasket 13
The capillary phenomenon acts between them, making it easier for the adhesive to infiltrate and temporarily bonding with a wide area ratio.If the viscosity of the adhesive S is high, it will infiltrate between the peripheral flange 11A of the lower case 11 and the packing 13. Since the amount is reduced and the packing 13 is partially temporarily bonded to the lower case 11, the viscosity of the adhesive S may be appropriately selected depending on the size, shape, etc. of the packing 13.

In addition, after the temporary fixing of the packing 13 is completed, the upper case 1
The assembly work is completed by placing the second peripheral flange 12A on the gasket 13 and tightening and fixing each of the cases 11 and 12 together via the gasket 13 using screws or crimping means (not shown). At this time, when the circumferential flange 12A of the upper case 12 is placed on the packing 13 in an appropriate state, the flexible packing 13 tries to shift its position, but the packing 13 itself Since the part 11A is temporarily fixed and held by adhesive, it is possible to reliably hold the fixed position without causing any displacement of the assembly position, and from this point, the lower case 1
When tightening and fixing the upper case 1 and the upper case 12, the gasket 13 can be put in a proper state and easily clamped, and good airtightness can be maintained.

In addition, there is a hole 1 in the packing 13 for injecting adhesive.
4 and pouring the adhesive S into the 14 holes, the adhesive S spreads around the 14 holes to bond the peripheral flange 11A of the case 11 and the packing 13. As a result, there is almost no need for the adhesive S to flow out to the outside, and workability can be improved.

In the above embodiment, the hole 14 for injecting the adhesive was formed into a round hole shape, but the same effect can be obtained even if the hole 14 is formed into a square hole shape or a slit shape. The number may be determined depending on the size and shape of the gasket 13, and in short, any number of gaskets may be used as long as the gasket can be temporarily held on one side of the case.

In addition, in the above-mentioned embodiment, the airtight structure of the case of the electrical equipment was described in detail, but this airtight structure can also be applied to a case that houses and fixes an indicator, or a case that houses and fixes a rotation sensor, etc. Can be applied.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a conventional device, FIG. 2 is a sectional view showing an embodiment of this invention, and FIG. 3 is an exploded perspective view showing the main parts of FIG. Lower case...11, Upper case...12, Packing...13, Hole...14, Adhesive...S.

Claims (1)

[Scope of utility model registration request] A case fixing device that fixes and holds each case by interposing gaskets at the abutting points of the upper and lower cases to form a storage space inside the case in a watertight manner, wherein adhesive is applied to appropriate locations on the gaskets. Alternatively, a fixing device for a case is characterized in that a plurality of holes are formed for positioning and fixing the packing by adhesion to the case by injection.