JP2001308554A - Respiration structure of outdoor enclosure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a respiration structure for securing a respiration function for preventing the entry of rainwater even under conditions where much rainwater flows down on the outside of an enclosure. SOLUTION: A door (24) of an enclosure (20) is set to double structure, and a duct (32) is formed inside. The duct (32) communicates with the fresh air via a lower respiration hole (42) at the lower portion, and communicates with the inside of the enclosure via an upper respiration hole (44) at the upper portion. The duct (32) has sufficient length in upper and lower directions, and the entry path of water to the upper respiration hole (44) is long, thus preventing water from entering the inside of the enclosure. Also, even under conditions where rain falls heavily, and much rainwater flows on the outside of the enclosure, all the lower respiration holes (42) will be blocked by water, thus securing a respiration function.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a respiratory structure of a housing of a communication device, an electric / electronic device, a lighting device, a motor, and other devices placed in an outdoor environment.

[0002]

2. Description of the Related Art A device placed in an outdoor environment such as a communication device is basically housed in a sealed housing having a waterproof structure. In order to prevent a pressure difference from occurring inside and outside of the housing due to a change in temperature difference between the outside air and the inside of the housing, it is necessary to provide a breathing hole in the housing. The breathing hole must be constructed to allow ventilation while preventing rainwater intrusion.

[0003] As this kind of breathing structure, for example, a breathing structure of an outdoor housing described in Japanese Utility Model Application Laid-Open No. 64-54375 and a breathing structure of an outdoor installation device described in JP-A-6-31130 are disclosed. It has been known. Figure 3 shows the actual opening 64
No.-54375 shows a breathing structure of an outdoor housing, in which a bottom wall 2 of a housing 1 is formed with a concave portion 4 protruding from an installation surface of an installation base 3, and the bottom wall of the housing 1 has Recess 4
A breathing hole 5 communicating with is provided. The purpose of this structure is to prevent water from leaking from the breathing hole 5 and to prevent troubles such as poor electrical characteristics of the device due to dew condensation and corrosion due to the water, circuit short circuit and disconnection.

FIG. 4 shows a housing structure of an outdoor installation apparatus disclosed in Japanese Patent Application Laid-Open No. 6-31130. A silica gel case 8 filled with silica gel 7 is attached to the bottom of the housing 6.
The silica gel case 8 is provided with a breathing hole 9 for eliminating a pressure difference between the inside and the outside of the housing 6. At the bottom of the silica gel case 8, a waterproof gas permeable membrane 10 having water resistance and air permeability is arranged. The air flowing into and out of the housing 6 is a waterproof ventilation membrane 10
And silica gel 7. At this time, infiltration of rainwater into the housing 6 is prevented by the waterproof gas permeable membrane 10, and moist air is absorbed by passing through the silica gel 7.
The inside of the housing 6 is kept at low humidity to prevent dew condensation.

[0005]

However, the conventional respiratory structure has the following problems. That is, the problem of the breathing structure of the outdoor housing disclosed in Japanese Utility Model Laid-Open No.
When the amount of rainwater flowing down the housing increases, the space of the concave portion 4 of the bottom wall 2 of the housing is filled with rainwater, and the plurality of breathing holes 5 of the bottom wall 2 are closed with the rainwater. Therefore, when a negative pressure is generated inside the housing due to a temperature change, rainwater is sucked. JP-A-6-311
The problem with the housing structure of the outdoor installation device of No. 30 is that when the amount of rainwater flowing down the housing increases, the waterproof ventilation provided at the bottom of the silica gel case 8 has water resistance and air permeability. Since rainwater directly contacts the membrane 10, the waterproof ventilation membrane 1
0 means that the patient loses the respiratory function and cannot compensate for the negative pressure inside the housing caused by the temperature change.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a breathing structure capable of preventing rainwater from entering even under conditions where a large amount of rainwater flows down the outside of the housing and ensuring a respiratory function. is there.

[0007]

SUMMARY OF THE INVENTION The present invention provides a breathing structure for a housing for accommodating a device to be placed in an outdoor environment, the breathing structure including at least a portion of a vertical outer wall of the housing having a hollow double wall. By constituting into a structure, a duct having a sufficient length is formed in the inside of the duct to extend vertically, and the outer wall of the double structure has one or more breathing holes communicating the lower part of the duct and the atmosphere outside the housing. And one or more breathing holes communicating the upper part of the duct with the internal space of the housing.

As described above, since the duct having a sufficient vertical length is formed by utilizing the outer wall of the double structure of the housing, a water inflow path from the lower breathing hole to the upper breathing hole is formed. become longer. As a result, even when the rain is severe and water enters the duct from the lower breathing hole, the water's own weight prevents water from reaching the upper breathing hole from there,
As a result, water is prevented from entering the inside of the housing from the upper breathing hole.

In a preferred embodiment, the lower breathing hole communicating the lower portion of the duct with the atmosphere outside the housing comprises a plurality of breathing holes. In the case where a plurality of lower breathing holes are provided in this manner, even when a large amount of rainwater flows down the exterior of the housing, all the lower breathing holes are not blocked by the rainwater, so that the breathing function is secured. Even if some holes are blocked by rainwater and negative pressure is generated inside the housing due to temperature change,
Rainwater is not sucked into the housing, and the reliability of the waterproof structure is improved.

[0010] In a specific embodiment, the housing has a double-walled open / close door, and the duct is formed inside the door. In a preferred embodiment, the inside of the duct is provided with a diagonally downwardly directed return. In this embodiment, even if rainwater enters the duct from the lower plurality of breathing holes, it does not reach the upper part of the duct because it is blocked by the downward return inside the duct.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIGS. 1 and 2, a housing 20 can be used to house electronic equipment (not shown) such as a communication device, and can be installed outdoors. In the illustrated embodiment, the housing 20 includes a main body 22 including upper, lower, left, and right panels and a rear panel, and a door 24 that opens and closes a front opening of the main body 22. Door 24 is hinge 2
6 is attached to the main body 22 so as to be openable and closable, and is locked to the main body by a locking mechanism 28. The space between the door 24 and the main body 22 is sealed by an annular packing 30.

As can be clearly seen from FIG. 2, the door 24 has a hollow double structure, and a duct 32 is formed inside the door 24 over the entire width. The door 24 includes a front plate 34,
It has a rear plate 36, a bottom plate 38, and a partition plate 40 that defines an upper limit of the duct 32. The partition plate 40 is disposed at a position where the duct 32 having a sufficient vertical length is formed. A plurality of lower breathing holes 42 are formed in the bottom plate 38 of the door 24 so that the lower part of the duct 32 communicates with the outside atmosphere. The rear plate 36 of the door 24 has a duct 3
A plurality of upper breathing holes 44 are provided to communicate the upper part of the housing 2 with the inside of the housing 20. The duct 32 provided in the door 24, the lower breathing hole 42, and the upper breathing hole 44 make the breathing structure 46 of the housing.
Is configured. The front plate 34 and the rear plate 36 of the door 24 are provided with a large number of returns 48 directed obliquely downward.

Next, the operation and function of the breathing structure 46 will be described. When the pressure inside the housing becomes smaller than the pressure of the outside air due to a temperature difference inside and outside the housing, the outside air is reduced to the lower part of the door 24 of the housing 20. Into the duct 32 through the breathing hole 42 of
It flows into the inside of the housing through the duct 32 through the breathing hole 44 in the upper part of the duct. When the pressure difference between the inside and the outside of the housing is reversed, the air inside the housing flows out of the housing in the opposite direction. In this manner, the housing 20 breathes, and the pressure difference between the inside and outside due to the temperature change is eliminated.

During rainfall, rainwater flows down the outer surface of the door 24, but since the door 24 is provided with a plurality of lower breathing holes 42, all the lower breathing holes 4 are provided even when the rainfall is severe.
2 will not be blocked by rainwater. Therefore, the breathing function of the housing is secured. Since the duct 32 has a sufficient vertical length and a long water inflow path, even if rainwater enters the lower part of the duct 32 through the lower breathing hole 42, the upper breathing hole 4
4 and does not penetrate further into the housing. In addition, the return 48 provided on the front plate 34 and the rear plate 36 of the door 24 prevents water from rising inside the duct 32.

Although a specific embodiment of the present invention has been described above, the present invention is not limited to this, and various modifications and changes can be made. For example, the duct may be formed in any other vertical wall of the housing or a portion thereof.

[0016]

As described above, the breathing structure of the present invention has a sufficiently long duct formed by using the outer wall of the double structure of the housing, and the water inflow path becomes longer. Also, even under severe rainfall conditions, water can be prevented from entering the housing. In an embodiment having a plurality of lower breathing holes,
Even if some of the breathing holes are closed with rainwater, all the breathing holes are not closed with rainwater, so that the breathing function of the housing is ensured. Therefore, even if a negative pressure is generated inside the housing due to a temperature change, rainwater is not sucked into the housing, and the reliability of waterproofing is improved.

In the embodiment in which the return is provided inside the duct, it is possible to more reliably prevent infiltration of rainwater. If the duct is formed integrally with the door using plastic or the like, the number of parts can be reduced, which is effective in improving productivity.

[Brief description of the drawings]

FIG. 1 is a perspective view of a housing provided with a breathing structure of the present invention.

FIG. 2 is a center sectional view of the housing shown in FIG. 1;

FIG. 3 is a cross-sectional view of a conventional outdoor installation device.

FIG. 4 is a sectional view of another conventional outdoor installation device.

[Explanation of symbols]

 20: Housing 24: Housing door 32: Duct 42: Lower breathing hole 44: Upper breathing hole 46: Breathing structure 48: Return

Claims (4)

[Claims] 1. A casing for accommodating a device to be placed in an outdoor environment, wherein at least a part of a vertical outer wall of the casing is formed in a hollow double structure to form a duct extending vertically in the inside thereof. And, in the outer wall of the double structure, at least one breathing hole communicating the lower part of the duct and the atmosphere outside the housing is provided, and at least one breathing hole communicating the upper part of the duct and the internal space of the housing is provided. Respiratory structure characterized by that. 2. The breathing structure according to claim 1, wherein the breathing hole communicating the lower part of the duct and the atmosphere outside the housing comprises a plurality of breathing holes. 3. The breathing structure according to claim 1, wherein the housing includes an open / close door having a hollow double structure, and the duct is formed inside the door. 4. A return which is directed obliquely downward is provided inside the duct.
Respiratory structure based on any of the following.