JPH0139292B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a dew condensation prevention device for wiring boxes,
Mainly used to prevent dew condensation in various wiring boxes that are embedded in the framework of concrete buildings such as buildings, and to prevent insulation defects in wiring boxes and stains on interior wall surfaces caused by condensed water. This invention relates to a dew condensation prevention device for wiring boxes that can remove condensation.

Conventionally, in the case of concrete frames of building structures, especially concrete buildings such as buildings that are highly airtight, there is a very large temperature difference between the outer surface of the wall that is in contact with the cold outside air and the inner surface of the wall that is heated. Condensation occurred on the inner surfaces of the side walls and bottom walls of various wiring boxes that were embedded in the building blocks and exposed on the inner surfaces of the walls. This condensation can cause poor insulation and corrosion inside the wiring box, and stain the interior wall surface, which is especially noticeable in cold regions during the winter. be. Moreover, once condensation occurs, it is extremely troublesome to remove it, maintenance and inspection are not easy, and it is virtually impossible to effectively prevent condensation.

That is, as shown in Fig. 4, a wiring box B such as an outlet box that is embedded in the frame C during construction of a concrete building is directly embedded in the frame C in an exposed manner, so that the outside is exposed to the outside air. It is directly affected by the temperature of the building frame C in contact with it, while the inside is affected by the indoor temperature through the interior wall material W and the mounting frame T for the outlet, switch, and TV terminal. Therefore, in cold regions, the temperature is low on the outside of the side walls and bottom wall of wiring box B, and high on the inside, so moisture existing indoors adheres to the inside surfaces and forms a condensation state. This resulted in various inconveniences, such as:

Therefore, the present invention was created in view of the above points, and it covers the outside of the wiring box embedded in the concrete frame with a heat insulating cover made of a heat insulating material to eliminate the influence of outside air. In the case of openings, a cylindrical coating cover is used between the inner surface of the building frame and the back of the interior wall material to prevent cold air convection from entering the space behind the interior wall material, which is indirectly affected by outside air. Therefore, by creating a substantially similar temperature atmosphere inside and outside the wiring box, it has been possible to effectively prevent dew condensation.

Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 1 to 3.

The reference numeral 1 shown in the figure is a substantially box-shaped heat insulation cover made of a heat insulating material, and is used as a built-in wiring box B such as a predetermined outlet box or a switch box to be buried in the concrete building frame C, for example, in the wall portion thereof. It is formed to cover the outside of the side walls and bottom wall. This thermal cover 1 is made of, for example, styrene foam with excellent heat insulation properties, has a wall thickness of about 10 to 20 mm, and has a wiring box B tightly housed inside, and a cable K drawn into the wiring box B. A wire passing hole 2 through which a wire passing material P such as a conduit or a directly buried cable is passed is opened on the side so as to correspond to the knockout N position of the wiring box B. (See Figure 2).

In addition, 3 is a paint allowance cover fixed to the opening of the wiring box B, and a wiring insertion opening 4 is opened for passing the cable K to the switch/outlet/TV terminal fixed to the interior wall material W. A cylindrical soft material having a cylindrical frame portion 5, which forms a plate 6 to be attached to the opening of the wiring box B, and whose opening edge presses against the back surface of the interior wall material W disposed in front of the surface C of the building frame. A covering tube 7 made of aluminum is connected to the tube frame portion 5, and a closing membrane 9 made of a soft material that can be cut and that closes the wiring insertion opening 4 is stretched.

This coating allowance cover 3 uses the conventionally used plate 6, and this 6 is made of a soft material.
For example, by molding polyvinyl chloride resin into a predetermined shape and covering it, that is, covering the plate 6 with a cover part 10 around the periphery of the cylinder frame part 5 and a covering part 12 that almost covers the entire cylinder frame part 5. In this way, the plate 6 is
By being integrated with the cover tube 7, the cover tube 7 can be connected to the tube frame portion 5. Moreover, since the cover part 10 is covered with the covering part 12, the cover part 10
When the wiring box B is fixed to the wiring box B using the screw holes 11 and the fixing screws 13 drilled in the
This closes even the slightest gap at the opening edge of wiring box B and helps prevent cold air from entering.

The cover tube 7 substantially matches the opening shape of the tube frame portion 5, and is formed slightly longer than the distance from the open end of the tube frame portion 5 to the back surface of the interior wall material W, and the opening edge thereof is shaped as shown in the figure. The abutment edge 8 is expanded outwardly,
Improves adhesion when abutting against the back surface of interior wall material W and prevents cold air from entering.

The closure membrane 9 can be cut open with a knife, cutter, or other general-purpose cutting tool to form an insertion gap 14 for guiding the cable K inside the wiring box B to the switch, outlet, and TV terminal. It has a thick wall, is formed integrally with the covering tube 7 or the covering part 12, and is stretched over the wiring insertion opening 4.

15 in the figure is a decorative cover F that is attached to the mounting frame T in which the outlet, switch, and TV terminal are installed.
This is a screw hole formed in the cylindrical frame portion 5 into which a set screw 16 is screwed for screwing.

The present invention is constructed as described above, and in use, as shown in FIG. 1 and FIG.
Corresponding to the position, the outside is covered with a heat insulating cover 1, and it is connected to a wiring material P such as a conduit or a directly buried cable, for example, a concrete frame C.
Then, the paint allowance cover 3 is fixed to the wiring box B with the fixing screws 13. After that, an interior wall material W having a laminated structure made of a hard urethane resin material and a gypsum board material is set at the open end of the cover tube 7 of the paint allowance cover 3, preferably in a state where it is expanded outward. The mounting frame T in which the outlet, switch, TV terminal, etc. are assembled and the decorative cover F are screwed into the mounting opening O opened in this interior wall material W, and the paint allowance cover 3 is screwed.
A predetermined connection is made to the cable K inserted through the insertion gap 14 obtained by cutting the occlusive membrane 9 of the cable.

Therefore, the inside of the wiring box B is not affected by cold air from the outside of the structure C due to the heat insulating cover 1 made of a heat insulating material that covers the wiring box B, and the paint allowance cover attached to the opening of the wiring box B 3 cover tube 5
However, since the convection of cold air generated in the gap between the building frame C and the interior wall material W is prevented from entering the wiring box B, there is no large temperature difference between the inside and outside of the side wall and bottom wall of the wiring box B, and the temperature remains the same. Therefore, no dew condensation occurs inside, and poor insulation and staining of the surface of the interior wall material W can be reliably prevented.

In addition, since the heat insulation cover 1 is formed into a box shape made of a heat insulating material and covers the outside of the side wall and bottom wall of a predetermined embedded type wiring box B buried in the surface C of the building frame, the outside of the wiring box B is completely covered. As a result, the cold air outside, especially the outside of the frame C, has no effect on the inside of the wiring box B, and the internal temperature can be kept constant.

On the other hand, the coating allowance cover 3 has a cylindrical frame portion 5 in which a wiring insertion opening 4 is opened, and a plate 6 is formed to be attached to the wiring box B opening to cover the wiring box B opening. It can be used and fixed in the same way as the above, and does not cause any inconvenience during work. In addition, since a cover tube 7 made of a cylindrical soft material whose opening edge presses against the back surface of the interior wall material W disposed in front of the surface C of the building frame is connected to the cylinder frame portion 5, the cover tube 7 is connected to the cylinder frame 5. 7 is extremely effective in preventing the convection of cold air generated in the gap between the frame C and the interior wall material W from entering into the cover tube 7 and further into the wiring box B. Not only that, but also the building frame C, interior wall material W
Even if there is a slight change in the gap between them, it can be accommodated, the opening edge of the cover tube 7 is securely pressed against the back surface of the interior wall material W, and cold air is always prevented from entering into the cover tube 7.
There is no large temperature change inside the cover tube 7.

Furthermore, since the closing film 9 stretched to close the wiring insertion opening 4 of the cylindrical frame portion 5 almost closes the opening of the wiring box B, it is possible to pass through the mounting opening O of the interior wall material W, the mounting frame T, etc. This is effective in preventing indoor warm air from entering the wiring box B, and is effective in removing moisture from entering due to dew condensation. Furthermore, since the occlusive membrane 9 itself is made of a soft material that can be cut open, there is no problem in connecting the cable K to the outlet, switch, TV terminal, etc. inside or outside the wiring box B through the wiring insertion opening 4. Moreover, the workability is also very good.

As explained above, according to the present invention, the outside of the wiring box installed embedded in the building frame is covered with a heat insulating cover, and a coating allowance cover is installed to prevent cold air convection at the opening. The inside of the box is completely unaffected by the cold air outside the structure, and the occurrence of dew condensation inside is reliably prevented. It has various excellent effects, such as reliably removing stains on wall materials and allowing long-term use in cold regions.

[Brief explanation of drawings]

Figures 1 to 3 show one embodiment of the present invention, with Figure 1 being a schematic explanatory diagram of the state of use, Figure 2 being a partially cutaway side view of the same, and Figure 3 being a partially cutaway exploded perspective view. , FIG. 4 is a partially cutaway side view of the conventional example. B... Wiring box, C... Body, F... Decorative cover, K... Cable, N... Knock out,
O...Mounting port, P...Wiring material, T...Mounting frame,
W...Interior wall material, 1...Heat insulation cover, 2...Wire insertion hole, 3...Painting allowance cover, 4...Wiring insertion opening, 5...Cylinder frame, 6...Plate, 7... Cover tube, 8...Abutting edge, 9...Occluded membrane, 10...Cover part, 11...Screw hole, 12... Covered part, 1
3... Set screw, 14... Insertion gap, 15... Screw hole, 16... Set screw.

Claims (1)

[Claims] 1 A substantially box-shaped heat-retaining cover made of a heat insulating material that covers the outside of the side walls and bottom wall of a predetermined embedded type wiring box to be buried in the structure surface, and a cylindrical frame portion with a wiring insertion opening, and a wiring box opening. form a plate that is attached to the wiring box opening to cover the
A cover tube made of a cylindrical soft material whose opening edge presses against the back surface of the interior wall material disposed in front of the body surface is connected to the tube frame portion, and a cuttable soft material that closes the wiring insertion opening. A dew condensation prevention device for a wiring box, consisting of a coating cover made of a occlusion film made of wood.