JPS6112717Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an airtight structure for an electrical equipment case installed outdoors.

An electrical equipment case consists of a main case and a lid case, and devices such as relays are housed inside the main case, and are often installed outdoors.
In order to maintain airtightness, a plate-shaped gasket was placed at the joint of both cases. FIG. 1 shows an example of this, in which a plate-shaped packing 2 is arranged in a recess 1a formed in the lower part of the main body case 1, and the upper end 3a of the lid case 3 is inserted into the recess 1a via the packing 2. The main body case 1 and the lid case 3 are fastened with bolts 4 through engaging pieces 1b and 3b that project outward, respectively.

In devices constructed in this way, the material of the plate-shaped packing deteriorates due to long-term use, and a plastic phenomenon occurs, creating a dent in the contact area of the plate-shaped packing with the lid case. When the case is opened and then closed again, there is a risk that the previous state of bonding will not be achieved in this recess, making it impossible to maintain airtightness, and the gasket may not be reusable.

Therefore, the present invention has developed a simple structure in which the gasket is made into an endless tube with a tapered surface on one side and a trapezoidal cross section with air sealed inside, and the main body case and the lid case are fastened through the gasket. The material of the packing itself can be made thinner, which prevents the plastic phenomenon caused by material deterioration due to long-term use.In addition, it is shaped like an endless tube to seal air inside to give it elasticity, and the joint surface is tapered. The present invention provides an airtight structure for an electrical equipment case that guarantees reliable airtightness at all times.

Embodiments embodying the present invention will be described below with reference to the drawings.

FIG. 2 shows an embodiment of a relay case embodying the present invention.

A concave groove 6a serving as a packing storage area is provided on the outer periphery of the side surface of the lid case 6 corresponding to the main body case 5 which has precision equipment (not shown) such as a relay inside, and one side of the concave groove 6a is tapered. 7a,
An endless tube-shaped packing 7 having a substantially trapezoidal cross section and having air sealed inside 7b is fitted in such a manner that a part of the vertical surface 7c side thereof is accommodated. Then,
When the opening of the main body case 5 is closed by fitting the lid case 6, the end 5a of the main body case 5 comes into contact with the tapered surface 7a of the endless tube-shaped packing 7, and the main body case 5 and the lid are closed. Case 6
When tightened with bolts 8 etc. through engagement pieces 5b and 6b protruding from the sides of the main body case end 5a
comes into contact with the tapered surface 7a of the endless tube-shaped gasket 7, and when tightened with bolts 8 etc. through engaging pieces 5b and 6b protruding from the side surfaces of the main body case 5 and the lid case 6, the main body Case end 5
a is the tapered surface 7a of the endless tube-shaped packing 7
The endless tube-shaped gasket 7 has a hollow interior and is filled with air, which causes elasticity and the tapered surface to prevent the gas from digging into the gasket. 6a and fitting the packing 7,
There is no deviation in the connection of the packing body case end 5a, and therefore the tightening force by the bolt 8 etc. gives a repulsive force to the packing 7, and the packing 7 is sequentially attached to the main body case end 5a surface. It has a shape that fits in well and covers the same end portion 5a. Therefore, surface contact between the two cases is achieved by the endless tube-shaped packing 7, and airtightness can be maintained sufficiently and reliably.

Also, regarding the endless tube-shaped packing itself, since it is thin as a packing member and has a face-to-face joint, there is no risk of plasticity occurring due to material deterioration due to long-term use, and the opening and closing operation of the case is easy. Even when done repeatedly,
It does not pose any hindrance to its reuse.

FIG. 3 shows another embodiment of the packing storage part of the present invention, in which a pair of upper and lower protrusions 6c and 6c' are provided on the side surface of the lid case.
The above-mentioned gasket is arranged between c and 6c', and the effect is the same as that of the previous embodiment.

As detailed above, the present invention has a simple structure that uses an endless tube-shaped packing with a tapered surface on one side and an air-filled interior, and has an almost trapezoidal cross section. It can be used in many industrial applications, as it can always maintain stable airtightness even when the case is repeatedly opened and closed, without forming any pores or causing plasticity during long-term use. .

[Brief explanation of the drawing]

FIG. 1 shows the airtight structure of a conventional electrical equipment case. FIG. 2a shows a cross-sectional view of the endless tube-shaped packing according to the present invention, and FIG. 2b shows a partial cross-sectional view of a relay case embodying the present invention. FIG. 3 shows another example of the packing prevention structure according to the present invention. 5...Main case, 5a...End, 6...Lid case, 6a...Concave groove, 6c, 6c'...Protrusion,
7...Endless tube-shaped packing, 7a...Tapered surface, 7b...Interior, 7c...Vertical portion.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) In an electrical equipment case consisting of a main body case in which a precision device such as a relay is housed and a lid case that fits into and closes the opening of the main body case, the outer periphery of the side surface of the lid case A packing storage part is formed on the top, and an endless tube-shaped packing having a tapered surface on one side and a hollow interior and having a substantially trapezoidal cross section is fitted into the storage part with the tapered surface facing outward; When assembling, bring the opening end of the main body case into contact with the tapered surface,
An airtight structure for an electrical equipment case characterized by tightening bolts and nuts between mounting pieces protruding from the main case and the cover case. (2) The airtight structure of the electrical equipment case according to claim 1, wherein the packing storage portion is a groove formed on the outer peripheral surface of the side surface of the lid case. (3) The airtight structure of an electrical equipment case according to claim 1, wherein the packing storage portion is a recess formed by a pair of upper and lower convex portions formed on the outer peripheral surface of the side surface of the lid case.