JP3858126B2 - Method for manufacturing anti-condensation box - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a dew condensation prevention box characterized in that a heat insulation layer for preventing condensation is integrally provided on the outer surface of the side wall and bottom wall of the box, and a method for manufacturing the dew condensation prevention box.
[0002]
[Prior art]
Conventionally, in concrete enclosures such as concrete buildings such as buildings that are particularly hermetically sealed, there is a very large temperature difference between the outer surface of the wall in contact with the outside air and the inner surface of the wall that is air-conditioned. Condensation occurs on the side walls and bottom wall inner surfaces of various types of embedded boxes, and this condensation causes, for example, poor insulation and corrosion in the wiring box. In addition, once dew condensation occurs, the removal thereof is extremely troublesome, and maintenance and inspection are not easy, and it is virtually impossible to effectively prevent this.
[0003]
Conventionally, for example, in order to prevent dew condensation on the side wall and bottom wall inner surface of a wiring box embedded in concrete, a dew condensation prevention apparatus A20 (FIG. 6) described in Japanese Patent Application Laid-Open No. 58-175908, Japanese Utility Model Laid-Open 3-77222. An anti-condensation device B30 (FIG. 7) is known.
In the figure, a dew condensation prevention apparatus A20 embeds a wiring box 21 in a substantially box-shaped heat insulation cover 22 so as to cover the side wall and the outside of the bottom wall of the wiring box 21, and in the opening of the wiring box 21, The cover body 22 is attached so as to cover the entire surface of the opening. The dew condensation prevention device B30 is for fixing the heat insulating sheet 32 cut into a predetermined shape obtained by developing the shape of the wiring box 31 to the outer wall of the wiring box 31 with an adhesive 33 interposed therebetween.
[0004]
[Problems to be solved by the invention]
However, in the dew condensation prevention device A, the gap between the box and the heat insulation cover cannot be brought into close contact, and a gap A is formed. For example, a knockout is punched out and a pipe is attached. There was a problem that concrete entered and reduced the effect of preventing condensation.
[0005]
In the dew condensation prevention device B, the heat insulating sheet is bonded and fixed to the entire outer wall of the wiring box with an adhesive interposed therebetween, so that the corners of the box are exposed or the heat insulating sheet is peeled off by impact. There was a problem that the concrete entered from the gaps to reduce the effect of preventing condensation.
[0006]
The present invention has been made in view of the above-described circumstances, and its object is to prevent condensation on the outer surface of the box body in order to prevent condensation in the box when embedded in a concrete frame. layers to provide a closely manufacturing method of condensation prevention boxes that have a constitutive characterized in that are provided.
[0007]
[Means for Solving the Problems]
The gist of the invention of claim 1 of the present invention taken in order to solve the above-mentioned problem is that “ an inner metal having a projection body that is fitted into a displacement prevention hole formed in the box body and holds the box body” type and, is separated a predetermined interval desired from the outer surface of the box body, within a space formed between the outer mold having to cover the box body, the blowing agent was injected, followed by bubbling formed integrally with the heat insulating layer in the box exterior surface, further, there a ring-shaped slit corresponding to knockout hole to the production process "of the condensation prevention box characterized that you formed on the outer surface of the heat insulating layer having the said box body .
[0008]
According to this box manufacturing method, it is possible to provide a method for manufacturing a dew condensation prevention box that can integrally form a heat insulation layer for preventing condensation on the outer surface of the box body.
[0009]
In addition, as an example of the dew condensation prevention box by this manufacturing method, “a dew condensation prevention box characterized in that a heat insulating layer for preventing dew condensation is provided in close contact with the outer surface of the side wall and the bottom wall of the box” can be considered .
[0010]
According to this dew condensation prevention box, since there is no gap between the box body and the heat insulation layer for preventing dew condensation, concrete infiltrates into the gap unlike the conventional dew condensation prevention device. It is possible to prevent condensation in the box. That is, it is possible to prevent insulation failure, corrosion, etc. in the box caused by this condensation, and to prevent the interior wall material surface from being damaged.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
In order to explain the configuration and the effects of the present invention in detail, an embodiment embodying the present invention will be given and described with reference to FIGS.
1 is a partially broken perspective view showing a box 10 of the first embodiment, FIG. 2 is a plan view, and FIG. 3 is a longitudinal sectional view of a main part taken along line AA of FIG.
[0012]
In the drawing, the box 10 of this embodiment is a wiring box, and the wiring box 10 is integrally formed so as to cover the entire surface of the wiring box main body 11 and the side wall and bottom wall outer surface of the box main body 11. It consists of a heat insulating layer 12 for preventing condensation.
On the wall surface of the wiring box main body 11, a knockout 14 for passing a cable conduit drawn into the wiring box 11 is formed.
[0013]
The heat insulation layer 12 for preventing condensation is made of foamed styrene having a thickness of 5 to 20 mm, and is integrally provided on the entire bottom wall and side wall outer surface of the wiring box body 11. However, the material of the heat insulation layer 12 for preventing condensation is not limited. The heat insulating layer 12 is preferably made of resin having foamability from the viewpoint of ease of manufacture and weight reduction, and the heat insulating layer 12 of this embodiment is a layer of foamed styrene. You may form a heat insulation layer with the foaming material of. In other words, any material that can be easily manufactured, has excellent heat insulation, is lightweight, and can be integrally formed with the wiring box itself, such as foamed urethane, urea, Examples thereof include other foamed materials typified by styrene-based, phenol-based, vinyl chloride-based, and synthetic rubber having a low thermal conductivity typified by synthetic rubber.
[0014]
The heat insulating layer 12 is formed with ring-shaped slits 15 having a slightly smaller diameter than the knockout hole 14 ′ at positions corresponding to the positions where the knockout 14 is formed, and is drawn into the wiring box 11. The opening work of the knockout hole 14 'through which the cable conduit is passed can be performed easily and accurately.
[0015]
Further, since the heat insulating layer 12 is provided in close contact with the box 11, there is no gap between the box 11 and the heat insulating layer 12, so that concrete may enter the gap from the opened knockout hole 14 ′. Absent. That is, it is possible to prevent dew condensation caused by the concrete entering the gap.
[0016]
Note that the wiring box 10a (second embodiment, not shown) having a configuration in which the heat insulating layer for preventing condensation is integrally formed on the entire inner surface of the bottom wall and the side wall of the wiring box main body 11 is shown. The wiring box 10a can obtain the same effects as the wiring box 10 of the first embodiment.
[0017]
Next, a method for manufacturing the wiring box 10 of the first embodiment will be described with reference to FIGS.
[0018]
First, the wiring box body 11 is formed into a predetermined shape by a known manufacturing method.
Next, the prefabricated wiring box body 11 is mounted on the inner mold 16 having a protrusion 16a that fits into and holds the anti-displacement hole 13 formed in the wiring box body 11 (FIG. 4). ). Next, a desired predetermined from the outer surface of the wiring box main body 11 with respect to the inner mold 16 that holds the box main body 11 with approximately half of the protrusions 16 a being fitted in the slip prevention holes 13 of the wiring box main body 11. The outer mold 17 provided so as to cover the wiring box main body 11 is brought into contact with the gap 18, and a gap 18 having a predetermined constant interval is provided between the outer surface of the wiring box main body 11 and the outer mold 17. (FIG. 5). Then, a kneaded product of a foaming agent and a dispersant kneaded with a screw of an injection molding machine is injected into the gap 18 formed between the outer surface of the wiring box main body 11 and the outer mold 17, and is heated and foamed. The heat insulating layer 12 is integrally formed, and the outer surface of the heat insulating layer 12 has a ring shape slightly smaller in diameter than the knock out hole 14 ′ at each position corresponding to the knock out 14 formed in the wiring box body 11. When the slit 15 is cut, a final product is obtained.
In addition, since the heat insulation layer enters the ring-shaped groove on the periphery of the slip prevention hole 13 and the knockout 14, this makes it possible to firmly integrate the box body 11 ′ and the heat insulation layer 12. Yes.
[0019]
By the way, this box does not limit the manufacturing method to the embodiment, for example, a heat insulating layer may be formed on the outer surface of the wiring box main body 11 by spraying at a work site. Optimal foam molding can be performed based on the difference in type.
[0020]
In general, the foam molding is a method in which a molding means such as normal extrusion molding, injection molding, or vacuum molding is combined with a bubble generating means. Typical examples of the bubble generating means include (1) A method in which a thermally decomposable foaming agent such as baking soda or azodicarbonimide is mixed into the plastic and thermally decomposed during molding or reheated after molding to generate bubbles, (2) Volatile such as pentane Examples include a method in which a resin impregnated with the above solvent (eg, polystyrene) is heated in a mold to vaporize the solvent, and (3) a method in which an inert gas is absorbed into the plastic by increasing the pressure and foamed at room temperature.
[0021]
The method of using the decomposable foaming agent described in the above (1) is preferable because it can be carried out using the conventional equipment as it is if only the foaming agent is prepared.
[0022]
Next, the wiring box 10b (not shown) of the third embodiment is manufactured in the same manner as described above by using the wiring box body 11 'whose entire outer surface has been etched in advance.
[0023]
According to the wiring box 10b of the third embodiment, various types of heat insulating layers can be integrally formed on the box body 11 ', and the heat insulating layer can enter into the ring-shaped groove on the periphery of the knockout 14. Together with this, there is an excellent effect that the integration of the box main body 11 ′ and the heat insulating layer 12 can be strengthened.
[0024]
It should be noted that it is extremely preferable to apply an anti-slipping or anti-detachment treatment to the outer surface of the box body 11, since the integration of the box body 11 'and the heat insulating layer 12 can be strengthened.
[0025]
Next, when using this wiring box, install a conduit, etc., and secure it with a set screw so that it can be embedded in the concrete frame in accordance with the installation position of the wiring box arranged according to the predetermined design. After being fixed, the concrete is cast and buried in the concrete frame, and then the outlet, switch, and TV terminal are used to cover the front opening of the wiring box body at the front opening opened on the wall surface. The wiring device mounting frame and / or the decorative cover in which the others are incorporated are screwed and predetermined connections are made. This work does not cause any inconvenience in work, and can be easily mounted and fixed as in the conventional case.
[0026]
Accordingly, since the heat insulating layer 12 is provided in close contact with the box 11, there is no gap between the box 11 and the heat insulating layer 12, so that concrete may enter the gap from the opened knockout hole 14 ′. Absent. That is, it is possible to prevent dew condensation caused by the concrete entering the gap.
[0027]
Thus, according to the box of the above embodiment, even when this box is embedded in concrete, it is integrally formed with the heat insulation layer being in close contact with the box body. Since the dew condensation phenomenon can be reliably prevented inside the box, it is possible to prevent the occurrence of accidents due to poor insulation in the box, and prevent the interior coating material from being damaged. In other words, particularly excellent effects such as being able to be used for many years in a cold region are obtained.
[0028]
Incidentally, the present invention is not intended to be limited to as embodiments described above, for example, it may be a heat insulating layer for preventing dew condensation so as to cover the inner surface of the box body formed integrally, and the inner surface of the box body In addition, a design change can be made as appropriate without departing from the spirit of the present invention, for example, a heat insulating layer for preventing condensation may be integrally formed so as to cover both the outer and outer surfaces. Further, it goes without saying that the present invention can also be applied to the mounting of wiring devices such as dimmers and grounds in addition to outlets and switch wiring devices.
[0029]
【The invention's effect】
As described above, in the method for manufacturing a dew condensation prevention box according to the first aspect of the present invention, an inner mold having a projection body that holds the box body by being fitted in a detent hole formed in the box body, by a predetermined distance apart to desired from the outer surface, into the gap formed between the outer mold having to cover the box body, the blowing agent is injected, and then a heat insulating layer in the box exterior surface by foaming provided integrally, further, the ring-shaped slit corresponding to the knockout holes with the said box body can provide a manufacturing method of the outer surface to the formation to that anti-condensation box of the heat insulating layer.
[0030]
In particular, if the entire outer surface of the box body is pre-etched, various types of heat insulation layers can be integrally formed on the box body, and the integration between the box body and the heat insulation layer can be strengthened. It has a particularly remarkable effect.
[0031]
Note that the anti-condensation box produced by the method for manufacturing a box according to the invention of claim 1 is integrally formed with the heat-insulating layer for preventing dew-condensing on the outer surface of the box, and there is a gap between the box and the heat-insulating layer. Therefore, the concrete does not enter the gap, and the inner peripheral surface of the knockout hole opened in the box can be attached in close contact with the outer surface of the energized material, so there is a large temperature difference between the inside and outside of the box. It is hard to occur, and it is possible to reliably prevent the occurrence of dew condensation inside the box, so it is possible to prevent insulation failure, corrosion, etc. inside the box caused by dew condensation, and to prevent the interior wall material surface from being soiled. Has excellent effects such as long-term use in cold regions.
[Brief description of the drawings]
FIG. 1 is a partially broken perspective view showing a dew condensation prevention box according to a first embodiment of the present invention.
FIG. 2 is a plan view of the box shown in FIG. 1;
FIG. 3 is a longitudinal sectional view of a main part of AA in FIG. 2;
FIG. 4 is a schematic longitudinal sectional view showing a state in which an outer mold is provided so as to cover the wiring box body and to be separated from the outer surface of the box body by a desired predetermined distance .
FIG. 5 is a schematic longitudinal sectional view showing a state in which the box body is held in the inner mold .
FIG. 6 is an exploded perspective view showing a dew condensation prevention apparatus A described in Japanese Patent Application Laid-Open No. 58-175908.
FIG. 7 is a main part perspective view showing a dew condensation preventing device B described in Japanese Utility Model Laid-Open No. 3-77222.
[Explanation of number]
DESCRIPTION OF SYMBOLS 10 ... Condensation prevention (wiring) box 10a of 1st Example ... Condensation prevention (wiring) box 10b of 2nd Example ... Condensation prevention (wiring) box 11 of 3rd Example 11 ... Box body 11 'for wiring ... Wiring box body 12 ... Heat insulation layer 13 for preventing condensation ... Knockout hole 14 ... Knockout 14 '... Knockout hole 15 ... Ring-shaped slit 16 ... Inner mold 16a ... Projection body 17 ... Outer mold 18 ... Gap 20 ... Dew condensation prevention device A described in Japanese Patent Application Laid-Open No. 58175908
21 ... Wiring box 22 ... Insulation cover 30 ... Condensation prevention device B described in Japanese Utility Model Publication No. 3-77222
31 ... Wiring box 32 ... Heat insulation sheet 33 ... Adhesive

Claims (1)

And inner die having a protrusion for holding the box body brought fitted into displacement preventing hole formed in the box body, is separated a predetermined interval desired from the outer surface of the box body, with so as to cover the box body A foaming agent is injected into a gap formed between the outer mold and then foamed, so that a heat insulating layer is integrally provided on the outer surface of the box, and a ring-like shape corresponding to the knockout hole of the box body. method for producing a condensation prevention box characterized that you form a slit on the outer surface of the heat insulating layer.

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