JPH0631130A - Enclosure construction of outdoor equipment - Google Patents

Abstract

PURPOSE:To prevent rain from entering an enclosure of outdoor equipment and to keep the inside of the enclosure at low humidity to prevent the dewing. CONSTITUTION:A vent hole to adjust the difference in pressure between inside and outside an enclosure 8 is made in the bottom part of the enclosure 8. The opening of the vent hole touching the open air is provided with a waterproof permeable membrane 3 of water resistance and permeability and further an air passage of the vent hole inside the waterproof permeable membrane 3 is filled with silica gel 4 to pass the air flowing in and out of the enclosure 8 through the waterproof permeable membrane 3 and the silica gel 4. As a result, rain is prevented from entering the enclosure 8 by the waterproof permeable membrane 3 and further steam contg. air is passed through the silica gel 4 to adsorb the moisture, allowing the inside of the enclosure 8 to be kept at low humidity to prevent the dewing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a housing structure for an outdoor installation apparatus, and more particularly to a housing structure having improved waterproof and moisture proof techniques.

[0002]

2. Description of the Related Art The conventional housing structure of an outdoor installation apparatus is shown in FIG.
As described above, the breathing hole 16 having a maze structure such as the air inflow path 20 is provided in the housing 18. Or as shown in Figure 4,
The housing 18 has a breathing hole 15, and a waterproof breathable membrane 13 having water resistance and breathability is attached to the opening of the breathing hole 15 by a holding plate 12 having the breathing hole 11 via an O-ring 17 to have a casing structure. ing. When the pressure inside the housing 18 changes due to a change in the ambient temperature, the air in the maze-shaped breathing hole 16 passes through the breathing hole 16 and flows out to the housing 18 to balance with the outside air pressure. Further, in the breathing hole structure in which the breathing hole is provided with the waterproof breathable film, air flows through the waterproof breathable film 13 into and out of the housing 18, thereby making the pressure inside the housing balanced with the external atmospheric pressure. As for the waterproof surface, the breathing hole 16 of the maze structure has a maze structure so that rainwater from the outside can be prevented from entering the housing 18. A breathing film such as the waterproof breathable film 13 prevents rainwater from entering the housing due to its water resistance.

[0003]

DISCLOSURE OF THE INVENTION In the above-mentioned conventional enclosure structure of an outdoor installation apparatus, in a structure in which a breathing hole of a maze structure is provided on the bottom surface of the enclosure, wind is caught in the bottom surface of the enclosure during rainstorm and rainwater is trapped inside the enclosure. There was a problem of infiltration. In addition, with the structure where a breathing hole is provided on the bottom of the housing and a waterproof ventilation film is provided at the opening of the breathing hole, the purpose of waterproof ventilation is achieved, but since it has breathability, there is a problem that water vapor also flows into and out of the housing at the same time. there were. In particular, when a large amount of water vapor flows into the housing and at the same time the outside temperature drops sharply, dew condensation may occur in the housing. Due to this dew condensation, there is a problem that an electric circuit is short-circuited and the housing is corroded.

[0004]

A housing structure for an outdoor installation apparatus according to the present invention is provided with a ventilation hole for ventilation for adjusting a pressure difference between the inside and outside of the housing, and an opening of the ventilation hole for contacting with the outside air. A waterproof breathable membrane having water resistance and breathability is provided, and the air passage inside the waterproof breathable membrane is further filled with silica gel, and the air flowing into and out of the housing passes through the waterproof breathable membrane and the silica gel. Is configured.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings. 1 and 2 are side cross-sectional views of the first and second embodiments of the present invention.

In the first embodiment shown in FIG. 1, the housing 8
A breathing hole for adjusting the pressure difference between the inside and outside is provided at the bottom of the. Further, the waterproof gas permeable membrane 3 is fixed to the silica gel case 2 having the air holes 1, and the silica gel 4 is filled on the waterproof gas permeable membrane 3. The silica gel case 2 is covered with a cover 6 having ventilation holes 5 so that the silica gel 4 contained in the silica gel case 2 does not spill. Next, the O-ring 7 is inserted between the silica gel case 2 and the housing 8 to fix the silica gel case 2 to the housing 8 with the screw 9. The silica gel case 2 is made of a transparent or translucent material.

According to the structure of the first embodiment,
When the internal pressure of the housing 8 decreases due to a temperature decrease or the like as compared with the atmospheric pressure, the air containing water vapor passes through the ventilation hole 1 of the silica gel case 2, then the waterproof ventilation film 3, and the further filled silica gel 4 And finally passes through the vent hole 5 of the cover 6 and flows into the housing 8. That is, the air containing water vapor is absorbed by passing through the filled silica gel 2, becomes dry air or air with reduced humidity, and flows into the housing 8. Therefore, the increase in humidity due to the air flowing into the housing 8 is suppressed. Furthermore, even when there is no air flowing into the housing 8, the moisture absorption effect of the silica gel 4 keeps the housing 8 at a low humidity, preventing dew condensation on the inner wall of the housing 8 that tends to occur when the outside air temperature suddenly drops. it can.
In addition, since condensation can be prevented, the short circuit of the electric circuit and the housing 8
The corrosion of can be prevented. Further, even when wind and rain are caught in the bottom surface of the housing 8 during a storm, the waterproof ventilation film 3 can prevent rainwater from entering the housing 8. Furthermore, since the silica gel case 2 is made of a transparent or semi-transparent material and the mounting position of the silica gel case 2 is set to a position overhanging to the bottom surface of the housing 8, the degree of moisture absorption of the silica gel 4 can be easily visually recognized, and the silica gel 4 The replacement time can be easily determined.

In the second embodiment shown in FIG. 2, most of the silica gel case 10 is embedded in the housing 8 so that the projections on the bottom surface of the housing are small. In both the first and second embodiments, the silica gel case 2 or 10 can be freely attached to the housing 8 with the screw 9, and the cover 6 can be removed to easily replace the silica gel 4.

The operation of the above-described embodiment is as follows. That is, the air flowing into the housing 8 contains water vapor, but when the air flowing in passes through the silica gel 4, the water vapor in the air is absorbed by the silica gel 4 to become dry air or the humidity is lowered. As a result, the amount of water vapor flowing into the housing 8 is reduced, and the increase in humidity inside the housing 8 is suppressed. Therefore, even when the outside air temperature suddenly drops, dew condensation does not occur. Alternatively, since the amount of dew condensation is small, it is possible to prevent a short circuit of an electric circuit in the housing 8 and corrosion of the housing 8.

[0010]

As described above, according to the present invention, a ventilation breathing hole for adjusting the pressure difference between the inside and outside of the housing is provided in the bottom of the housing.
A waterproof breathable membrane with water resistance and breathability is provided at the opening of the breathing hole that is in contact with the outside air, and silica gel is filled in the air passage of the breathing hole inside the waterproof breathable membrane to waterproof the air flowing into and out of the housing. Since the structure is such that it passes through the gas permeable membrane and silica gel, the air containing water vapor that flows into the housing when the internal pressure of the housing is lower than the atmospheric pressure is made into dry air or low humidity air by the hygroscopic action of silica gel. Therefore, there is an effect that the increase in humidity in the housing due to the air flowing into the housing can be suppressed. Furthermore, even when the internal pressure of the housing is in equilibrium with the atmospheric pressure and there is no inflow of air into the housing, the moisture absorption effect of silica gel has the effect of keeping the humidity inside the housing low. Due to this effect, the inside of the housing is kept at a low humidity at all times, so that it is possible to prevent dew condensation on the inner wall of the housing which is likely to occur when the outside air temperature suddenly drops. Further, since dew condensation can be prevented, it is possible to prevent short circuit of the electric circuit and corrosion of the housing. Further, since the waterproof breathable film is provided, there is an effect that rainwater can be prevented from entering the housing due to the wind and rain caught on the bottom surface of the housing during a storm.

[Brief description of drawings]

FIG. 1 is a side sectional view of a first embodiment of the present invention.

FIG. 2 is a side sectional view of a second embodiment of the present invention.

FIG. 3 is a cross-sectional view of a housing structure with a breathing hole of a maze structure of the related art.

FIG. 4 is a cross-sectional view of a housing structure of the related art in which a waterproof breathable film is provided in a breathing hole.

[Explanation of symbols]

 1 Vent hole 2,10 Silica gel case 3,13 Waterproof breathable membrane 4 Silica gel 5 Vent hole 6 Cover 7,17 O-ring 8,18 Casing 9,19 Screw 11,15,16 Breathing hole 12 Holding plate 20 Air inflow path

Claims (1)

[Claims] 1. A ventilation hole for ventilation for adjusting a pressure difference between the inside and outside of the housing is provided in a bottom portion of the housing, and a waterproof ventilation film having water resistance and air permeability is provided at an opening of the breathing hole which is in contact with outside air. The structure of the outdoor installation device is characterized in that the air passage inside the waterproof gas permeable membrane is filled with silica gel, and the air flowing into and out of the housing is configured to pass through the waterproof gas permeable membrane and the silica gel. .