JPH0150164B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to an airtight dustproof method and an airtight dustproof device in wiring boxes, and is used in clean rooms installed to clean working environments in many industrial fields. The present invention relates to an airtight dustproof method and device for ensuring airtightness and dustproofing of electrical outlets, switches, and other wiring mechanism parts.

[Technical background of the invention and its problems] In recent years, with the development of industry and medicine, the electronics industry, precision industry, pharmaceutical manufacturing industry, food industry, optical machinery industry, construction of laboratory animal housing, and many other industries. Cleanliness of the working environment is required across industrial fields, and clean rooms are being installed in each field. During this clean room installation work, we will ensure that the seal is completely sealed to ensure airtightness and no air leakage.
Strict conditions are imposed, including that there be no cracks and that the structure is designed to prevent contaminant particles from falling from walls and ceilings due to vibration. In particular, since electric wires are drawn from the outside into the wiring box at indoor outlet and switch locations, airtightness must be maintained within the wiring box. Therefore, conventionally, as shown in Figures 1 and 2, the wiring box B to which the conduit P is connected is installed on the back side of the installation opening H opened in the wall W by the usual method. , a silicone (oxime-component type) sealing material S is charged into the opening of the wall W, and parts that communicate with the outside of the wiring box B, such as the knockout edge, the small mounting hole, and the insulating bushing that connects the conduit P, the box. Seal the area around cover C and other parts manually. that time,
The wiring box B may be made of hard vinyl resin without knockouts, and the conduit P may be made of the same material. Next, conduit P
Connect the electric wire G, which has been sealed at the insulating bushing part pulled out from inside, to the electric mechanical parts E, such as the outlet body and the switch body attached to the mounting frame F, and connect it to the periphery of the installation opening H. Rubber pads R are arranged and fixed to the mounting frame F with screws, respectively.

During such construction, the seal is checked several times to ensure a perfect seal, and when the equipment is installed, the seal condition is checked again and any defective parts are corrected. However, it is difficult to seal the inner surface of the wiring box B and the insulating bushings, resulting in a lot of air leakage, which often results in extremely incomplete seals.In addition, there are many sealing points and the sealing material S is used extensively, resulting in poor work efficiency. In addition to increasing construction costs, it was difficult to inspect and confirm air leakage. In particular, when the electric mechanical component E was inserted into the wiring box B, the electric wire G wobbled, which tended to create a gap in the insulating bushing, and it sometimes took time for the sealant S to adhere.

[Object of the Invention] In view of the above-mentioned conventional circumstances, the present invention was created to eliminate these drawbacks. The purpose is to eliminate the need for sealing, improve work efficiency, reduce overall construction costs, limit areas where air leaks can occur, and facilitate inspection and confirmation. It is.

[Summary of the Invention] In order to achieve the above-mentioned object, the airtight dustproof method according to the present invention supports and fixes a wiring box and a conduit on the back side of an installation opening opened in a wall, and at the same time supports and fixes a wiring box and a conduit through the conduit. The electric wire is passed through an airtight box formed of an airtight element, the electric wire is hermetically closed and inserted through an electric wire drawing means attached to this airtight box, and the electric wire is then airtightly inserted into the airtight box. The method consists in connecting electrical mechanical parts such as an outlet main body or a switch main body covered with a box, and then bringing the periphery of the airtight box into close contact with the periphery of the installation opening and performing a predetermined cosmetic treatment. The airtight dustproof device used directly to carry out the method is an airtight device that covers electrical mechanical parts such as the outlet main body and switch main body that are inserted and set into the wiring box that is supported and fixed behind the installation opening opened in the wall. A box body made of material is formed, an abutment flange extending in close contact with the periphery of the installation opening is provided on the periphery of the opening of the box body, and an airtight electric wire pulling means that allows insertion of the electric wire is provided on the bottom wall of the box body. This is due to the fact that it was added.

[Embodiments of the Invention] Hereinafter, embodiments of the present invention will be described with reference to FIGS. 3 to 7.

Reference numeral B shown in the figure is a conventional wiring box such as a switch box, outlet box, or outlet box. By positioning it in the installation opening H opened in W, it is supported and fixed on the back side of the wall W by a known fixing means (not shown). Further, a conduit P through which an electric wire G of a predetermined diameter is passed is connected to the wiring box B by a lock nut N and an insulating bushing. In any case, the wiring box B and conduit P may be made of metal that has been commonly used, and there are no restrictions on the material.
There is nothing different from the conventional construction procedure.

Then, inside the wiring box B, an airtight box 1 made of an airtight material is charged and set, which seals and partitions the inside of the clean room and the outside of the clean room. This airtight box 1 has an installation opening H at the opening edge of a box body 2 formed in a box shape so as to cover electrical mechanical parts E such as an outlet main body and a switch main body located in the installation opening H. An abutment flange 3 is extended to abut on the periphery, and a wire drawing means 4 is attached to the bottom wall of the box body 2. The material is made of, for example, butyl rubber (IIR), which has a very low permeability to water vapor and gas, and by doing so, it is possible to improve workability by utilizing the flexibility of the material itself.

The electric wire drawing means 4 has an inner diameter corresponding to the outer diameter of the electric wire G to be drawn out, and is preferably formed into a cylindrical shape that can be penetrated and is closed, and is arranged to protrude outward from the bottom wall. In order to seal each electric wire G, there are protruding protrusions corresponding to the number of lead wires, for example, 3 on the upper tier and 2 on the lower tier, and are integrally or connectable with the box body 2. It is constructed separately from the same material as 2.

The electric wire pulling means 4 shown in the figure is formed separately from the box body 2, which is the main body of the airtight box 1, so that it can be used in combination to accommodate the different diameters of the electric wires G to be drawn in. It is equipped with an electric wire draw-out tube 8. That is, Fig. 6,
As shown in FIG. 7, on the bottom wall of the box body 2, a thick ring-shaped connecting annulus 7 is raised around a penetrable thin film-like closing seal 7 to form a pull-out portion 5. 5 is connected to an electric wire pull-out tube 8, and the electric wire pull-out tube 8 has an appropriate number of presser ribs along the circumferential direction on the inner circumferential surface of the insertion cylinder 9, which has an inner diameter corresponding to the outer diameter of the electrode G. 10 is raised, and a joint opening 11 is provided at the rear of the insertion cylinder 9 to be connected to the connecting ring 7 in an internally or externally fitting manner.
Insertion openings 13 are formed in the front portions, respectively, and are closed with penetrable thin film-like closing pieces 12. In addition, 14 is a guide tube formed in a flap-like manner to protrude toward the front of the insertion port 13 to ensure smooth insertion guidance of the electric wire G, and 15 is a joining flange provided in a flange-like manner on the outer periphery of the joint port 11. When bonded to the body 2, the bonding stability is improved by coming into close contact with the seven connecting annular surfaces. Further, as shown in the figure, by opening the inner surface of the connecting ring 7 in a trumped shape, it is possible to facilitate the joining operation and to achieve reliable connection.

Therefore, there are several types of wire extraction tubes 8 having different inner diameters of the insertion cylinder 9, for example, 3.2φ, 3.6φ, and 4φ.
By preparing a number of wires, it is sufficient to select and use one corresponding to the diameter of the electric wire G, and join the joint opening 11 to the connecting ring 7 with an adhesive. And blockage piece 1
2 and the closing seal 6 with a cutter or other cutting tool or directly with the electric wire G to forcibly insert the electric wire G, and if necessary, insert it around the electric wire G to improve airtightness. The gap between the cylinder body 9 and the inner circumferential surface may be filled with an adhesive or the like. Therefore, compared to a case where the box body 2 and the wire pull-out tube 8 are integrated, there is no need to prepare separate manufacturing molds for different wire G diameters, and the product yield during molding is improved. is of good quality and can be provided at low cost. In addition, when the number of electric wires G is small, the closed seal 6, which is not used and is not opened, ensures a sealed compartment inside and outside the airtight box 1, and the rib 10 presses the insertion cylinder 9 to the outer periphery of the electric wire G. This effectively helps maintain airtightness.

When the airtight box 1 constructed in this way is charged and set so as to cover the electrical mechanical parts E, the back surface of the abutting flange 3 is coated with double-sided adhesive tape and adhesive to the wall W that is the clean room side.
The surface of the flange 3 is brought into contact with the back surface of the mounting frame F to which the electric mechanical component E is attached. The mounting frame F itself is normally connected to the box cover C by screwing the mounting screws 16 into the box cover C so that the mounting screws 16 are inserted into the box cover C. A through-insertion part 17 is formed to be inserted. This penetration part 1
7 is located outside the box body 2 and protrudes in a cylindrical shape on the back side of the abutment flange 3, and is closed with a thin film-like closure film 18 that can be penetrated through the tip opening. . The occluding membrane 18 is opened with a cutter or other cutting tool, or directly with the mounting screw 15.

After that, the decorative cover D is screwed to the mounting frame F using a normal method.

Next, the construction procedure will be explained with reference to FIGS. 3 to 5. As in the conventional case, the wiring box B, conduit P, and box cover C are combined to form the installation opening H on the back side of the wall W. Support and fix it with the handle, and wire the electric wire G (see Fig. 3). Next, the electric wire G is inserted from the outside of the electric wire pulling means 4 in the airtight box 1 (see Fig. 4) and connected to the electric mechanical component E attached to the mounting frame F, while the box body 2 in the airtight box 1 is connected to the electric wire. Cover mechanism part E.
After that, the abutment flange 3 is inserted into the installation opening H of the wall W.
The mounting frame F is attached to the box cover C in airtight contact with the periphery, and the decorative cover D is attached to the mounting frame F.
(See Figure 5).

[Effects of the Invention] The present invention provides the above-mentioned method and apparatus,
In the case of electrical outlets, switches, and other wiring mechanism parts in a clean room, the inside and outside are reliably separated by the airtight box 1, so there is no need for the conventional sealing process using the sealing material S. Therefore, compared to the conventional method of sealing each location manually, which could only seal 5 to 6 locations per work day, the work can be performed several times more efficiently and construction costs can be reduced. Significant savings can be made. Furthermore, when inspecting and confirming after construction, since there are only two locations where air leakage may occur, the 4 locations in the airtight box 1 and the 3 locations of the contact flange, inspection is extremely easy. It is also very easy to repair leaks once they are discovered.

In particular, in the wiring box B, the inside of the electrical conduit P connected to the wiring box B and the electrical mechanical component E that communicates with the clean room are completely separated by the airtight box 1 that covers the electrical mechanical component E. Since there is no air circulation between the two areas, it is possible to prevent dust and other particles present along the electric conduit P from entering the clean room, thereby maintaining the cleanliness of the room.
In addition, the airtight box 1 is made of an airtight material, and the wire pulling means 4 through which the electric wire G connected to the electrical mechanical component E is inserted is airtightly closed, so that air leakage at the portion where the electric wire G is inserted is prevented. Furthermore, since the abutting flange 3 on the periphery of the airtight box 1 is in close contact with the periphery of the installation opening H, there is no air leakage at all at the installation site.

Since the airtight box 1 is formed so as to cover the electrical mechanical component E, there is no need for separate sealing treatment using sealing material S on the inner surface of the wiring box B, the insulating bushing part, etc., which is different from the conventional method. It does not require manual labor and is easy to install, which has excellent effects such as dramatically improving work efficiency.

[Brief explanation of drawings]

Figures 1 and 2 show the conventional method. Figure 1 is a cross-sectional view with a sealing material applied, Figure 2 is a cross-sectional view with the electric wire connected to an electrical mechanical component, and Figures 3 to 2 show the conventional method. Figure 7 shows an embodiment of the method and apparatus according to the present invention, Figure 3 is a sectional view of the wiring box and the conduit after it is supported and fixed, and Figure 4 is a diagram showing the wiring box and the electric wire inserted into the airtight box. FIG. 5 is a cross-sectional view after completion of construction, FIG. 6 is a partially cutaway exploded perspective view of the apparatus of the present invention, and FIG. 7 is an exploded cross-sectional view of the main part. B...Wiring box, C...Box cover,
D... Cosmetic cover, E... Electrical mechanism parts, F...
Mounting frame, G...Wire, H...Installation opening, I...
Insulating bushing, N... Lock nut, P... Electric conduit, R... Rubber packing, S... Seal material, W
... Wall body, 1 ... Airtight box, 2 ... Box body, 3 ... Abutment flange, 4 ... Electric wire drawing means,
5... Drawer part, 6... Closing seal, 7... Connecting ring strip, 8... Wire pull-out tube, 9... Insertion cylinder,
10... Presser rib, 11... Joint port, 12... Closing piece, 13... Insertion port, 14... Guide cylinder, 15...
...Joining flange, 16...Mounting screw, 17...Penetrating portion, 18...Occluded membrane.

Claims (1)

[Scope of Claims] 1. A wiring box and a conduit are supported and fixed on the back side of an installation opening opened in a wall, while an electric wire is routed through the conduit into the wiring box, and the box is made of an airtight material. The electric wire is hermetically closed and inserted into the airtight box through an electric wire drawing means attached to the airtight box, and the electric wire is further covered with the airtight box;
An airtight dustproof method in a wiring box, characterized in that the wiring box is connected to an electrical mechanical part such as a switch body, and then the periphery of the airtight box is brought into close contact with the periphery of the installation opening, and a predetermined cosmetic treatment is performed. 2. A box body made of an airtight material is formed to cover electrical mechanical parts such as an outlet main body and a switch main body to be inserted and set in a wiring box that is supported and fixed on the back side of an installation opening opened in a wall, and this box body Airtightness in a wiring box, characterized in that an abutment flange extending in close contact with the periphery of the installation opening is provided on the periphery of the opening, and an airtight wire extraction means that allows insertion of the wire is attached to the bottom wall of the box body. Dust control device. 3. The airtight dust-proof device in a wiring box according to claim 2, wherein the wire drawing means is integrally constructed with the box body. 4. An airtight dust-proof device in a wiring box according to claim 2, wherein the wire drawing means is configured separately from the same material as the box body so as to be connectable to the box body. 5. The wire drawing means is located on the bottom wall of the box body,
A thick ring-shaped connecting annulus is raised around the penetrable thin film-like closure seal to serve as a pull-out part, and on the other hand,
An appropriate number of presser ribs are raised along the circumferential direction on the circumferential surface of the insertion tube with an inner diameter corresponding to the outer diameter of the wire, and a joint opening to be joined to the connecting ring is provided at the rear of the insertion tube, and a joint opening is provided at the front of the insertion tube. 5. An airtight dust-proof device in a wiring box according to claim 4, wherein electric wire draw-out tubes each having an insertion opening closed with a thin film-like blockage piece that can be penetrated are connected to the draw-out portion.