JPH10200274A - Cabinet for housing electronic apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To absorb the pressure difference in two enclosures by forming a through-hole through at least one of the enclosures and mounting a value disc in the through-hole which opens and closes, depending on the pressure difference between the inside and the outside of the enclosure. SOLUTION: A valve disc 24 has a cylindrical part 30 having an annular coupler 30a extruding at the periphery and approximately a cross cut 30b crossed at the bottom center. A cover 25 has air-flow holes 25a opened at the inside and outside of the side wall and coupling hole 25b at the inner wall, facing the coupler 30a. A protective wall 32 protruding in directions perpendicular to the axial line of the air-flow holes 25a is integrated with inner bottom face of the cover 25. Owing to the pressure difference between the inside and outside of the enclosure, the valve disc 24 deforms to open the cut 30b, thereby flowing air from a high pressure to a low pressure to absorb the pressure difference between the inside and outside of the enclosure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a housing for electronic equipment, which is suitable for housing electronic equipment such as a wireless device for outdoor installation.

[0002]

2. Description of the Related Art In general, a housing for electronic equipment of this type is provided with a first exterior body having an opening for accommodating electronic equipment, and is detachably mounted on the first exterior body via a sealing member. And a second exterior body capable of opening and closing the opening.

[0003] In the housing for electronic equipment thus constructed, the temperature of both exteriors rises due to the heat generated by the electronic devices inside both exteriors, and the surfaces of both exteriors also rise due to rainfall, snow or power interruption. If cooled rapidly, the temperature in both exterior bodies will fall.

[0004] Now, the inside of both exterior bodies is in a high temperature state due to the heat generated by the electronic equipment, and when rain or snow falls in this state, the surfaces of both exterior bodies are instantaneously cooled, and the ambient temperature inside both exterior bodies rapidly decreases. The internal pressure also decreases sharply. At this time, a suction force acts on the both exterior bodies from outside the both exterior bodies due to a pressure difference generated inside and outside the both exterior bodies, and a deformation force is generated on the seal member, which makes it difficult to ensure a uniform contact pressure on the both exterior bodies over the entire circumference. A slight gap is formed between the exterior bodies, and rainwater or the like infiltrates into both exterior bodies from this gap.

Therefore, in such an electronic device housing, a mechanism for adjusting or absorbing a pressure difference between the inside and outside of the both exterior bodies is necessary in order to prevent rainwater or the like from entering the exterior bodies.

Conventionally, this kind of electronic equipment housing is disclosed in Japanese Patent Application Laid-Open No. 6-61657.
And the main part thereof is configured as shown in FIGS. 5 (a) and 5 (b). This is schematically described with reference to the figure. In the figure, reference numeral 1 denotes an exterior body for housing electronic equipment having a through hole 1a that opens inside and outside the exterior body, and 2 denotes a case that is attached to the exterior body 1 and penetrates. It is an elastic film that closes the hole 1a.

In the electronic device housing thus configured, when the pressure inside the exterior body 1 is smaller than the pressure outside the exterior body 1, the pressure P increases from the outside to the inside as shown in FIG. By acting, the elastic film 2 is deformed so as to swell inside the outer package 1. On the other hand, when the pressure inside the outer package 1 is larger than the pressure outside the outer package 1, the pressure P is increased as shown in FIG. The elastic film 2 was deformed so as to act from the inside to the outside to expand to the outside of the exterior body 1.

In such an electronic device housing, when the pressure difference between the inside and outside of the exterior body 1 is small, the elastic film 2 can be deformed to absorb the pressure difference. If it is large, there is a possibility that the elastic film 2 breaks and cannot absorb the pressure difference.

Therefore, a conventional housing for storing electronic equipment includes:
Japanese Unexamined Patent Publication No. 7-15151 discloses a "wireless device" which employs a pressure absorbing (adjusting) mechanism provided with a bellows or an elastic bag as shown in FIGS. 6 (a) and 6 (b). Have been.

[0010] Referring to FIG. 1, reference numeral 11 denotes an exterior body for accommodating an electronic device having a through-hole 11 a opened inside and outside the exterior body.
Is an elastic bag attached to the exterior body 11 and having a fitting for closing the through hole 1a.

In the electronic device housing thus configured, when the pressure inside the exterior body 11 is smaller than the pressure outside the exterior body 11, the pressure P is changed from the outside to the inside as shown in FIG. By acting, the elastic bag 12 is deformed so as to expand inside the exterior body 11, while the pressure in the exterior body 11 is increased.
When the pressure is larger than the outside pressure, the pressure P acts from the inside to the outside as shown in FIG.
Was deformed to wither within.

[0012]

However, in this type of electronic equipment housing, since a bellows or an elastic bag (elastic body) faces the exterior body as a pressure absorbing mechanism, these elastic bodies are deformed. It was necessary to secure space in the exterior body to absorb the amount.

Here, the space occupied by the elastic body of the bellows and the elastic bag in the outer casing becomes larger because the deformation amount of the elastic body increases as the volume in the outer casing increases. For example, if the absolute temperature and the volume in the exterior body before the change are T1 and V1, respectively, and the absolute temperature and the volume in the exterior body after the change are T2 and V2, respectively, under the equal pressure condition according to Boyle-Charles' law, V2 / V1 = T2 / T1,
Volume change rate is (T2 / T1) x 100% and temperature difference 20 ° C
7%, and a temperature difference of 30 ° C. changes by 10%.

As a result, there is a problem that the space inside the exterior body becomes large and the exterior body becomes large.

The present invention has been made in view of such circumstances, and it is not necessary to secure a wide space in the exterior body for absorbing the amount of deformation of the pressure absorbing mechanism, and thus the size of the exterior body is reduced. It is an object of the present invention to provide an electronic device housing that can be used.

[0016]

According to a first aspect of the present invention, there is provided a housing for electronic equipment storage according to the present invention, comprising: a first exterior body having an opening for storing electronic equipment; 1
A second exterior body detachably disposed on the exterior body via a seal member and having a second exterior body capable of opening and closing the opening, wherein the interior and exterior surfaces of at least one of the two exterior bodies are provided inside and outside of the exterior body; Are provided, and a valve element which is opened and closed by a pressure difference between the inside and outside of the outer package is mounted in the through hole. Therefore, when the valve element is opened due to the pressure difference between the inside and outside of the exterior body, the inside / outside air moves from the high side to the low side, and the pressure difference inside and outside the exterior body is absorbed.

The second aspect of the present invention is the first aspect of the present invention.
In the electronic device housing described above, the valve body is formed of an elastic film having a substantially cross-shaped cut.

The third aspect of the present invention is the first aspect of the present invention.
Alternatively, in the electronic device housing according to the item 2, a cover having an air outflow / inlet hole is attached to the valve body.

The invention described in claim 4 is the third invention of the present invention.
In the electronic device housing described above, the cover is provided with a protective wall protruding in a direction inclined with respect to the axial direction of the air inflow / outflow hole. Therefore, even if rainwater enters the cover from the air inflow / outflow hole, it is blocked by the protective wall.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described.
This will be described with reference to the drawings. FIGS. 1A and 1B are a plan view and a sectional view showing a main part of an electronic device housing according to a first embodiment of the present invention, and FIGS. 2 and 3 are also the first embodiment of the present invention. 3A and 3B are a perspective view and a local sectional view showing an electronic device housing according to the first embodiment. In FIG. 1, the electronic device housing indicated by reference numeral 21 includes a first exterior body 22, a second exterior body 23, a valve body 24, and a cover 25.

The first exterior body 22 has an opening 22a for accommodating an electronic device 26 such as a wireless device so that the electronic device 26 can be inserted and removed.
The whole is formed by a rectangular box. First exterior body 22
Is provided with a through hole 22b that opens inward and outward. A cable 27 for transmitting and receiving signals is connected to the electronic device 26 in the first exterior body 22. In addition, a seat member (not shown) is attached to the bottom of the first exterior body 22.

The second exterior body 23 is detachably provided on the first exterior body 22 via a packing 28 as a sealing member, and is entirely formed by a rectangular box. Thus, the opening 22a of the first exterior body 22 is opened and closed.
In addition, the second exterior body 23 is fixed to the first exterior body 22 by screwing a bolt 29.

The valve body 24 has a cylindrical portion 30 inserted through the through hole 22b and a flange portion 31 in contact with a peripheral edge of an inner opening of the through hole 22b. The valve body 24 is mounted on the first exterior body 22, and is entirely rubber or organic. It is formed of an elastic member made of a material or the like. The cylindrical portion 30 of the valve body 24 is formed with an annular engaging portion 30a protruding from the outer peripheral surface of the cylindrical portion and a substantially cross-shaped cut 30b intersecting at the center of the bottom surface of the cylindrical portion.

The cover 25 has a space 31 therein and is mounted on the cylindrical portion 30 of the valve body 24, and is formed entirely of a bottomed cylindrical body made of, for example, a metal material. As a result, intrusion of harmful substances and the like into both exterior bodies 22 and 23 is prevented. The peripheral wall of the cover 25 is provided with a plurality of air inflow / outflow holes 25a opening inside and outside the cover, and the inner peripheral surface is provided with an engagement hole 25b facing the engagement portion 30a. In addition, a protective wall 32 is integrally provided on the bottom inner surface of the cover 25 so as to protrude in a direction perpendicular to the axial direction of the air inflow / outflow hole 25a. Thereby, the air outflow / inflow hole 2
Even if rainwater enters the cover 25 from 5a, it is blocked. The protruding direction of the protection wall 32 may be any direction as long as it is inclined with respect to the axial direction of the air inflow / outflow hole 25a.

In the electronic device housing thus configured, when the cut 30a is opened due to the deformation of the valve body 24 due to the pressure difference between the inside and outside of the exterior bodies 22, 23, the inside and outside air moves from the high side to the low side. As a result, a pressure difference between the inside and outside of the exterior bodies 22 and 23 is absorbed.

This will be described with reference to FIG.
If there is no pressure difference between the inside and the outside of the valves 2 and 23, the valve body 24 does not deform as shown in FIG.

Next, when rainwater or snow adheres to the outer surfaces of the exterior bodies 22 and 23 and the internal pressure becomes smaller than the external pressure due to rapid cooling of the interior air of the exterior bodies 22 and 23, as shown in FIG. body 22, 23 direction, that the outside air pressure in the arrow P ₁ direction as internal and external pressures are balanced is opened 30b cuts acts on the valve element 24, the outside air flows into the outer body 22, 23 from the notch 30b Pressure is adjusted.

On the other hand, when the internal air temperature of the outer casings 22 and 23 rises due to the heat generated by the electronic device 26 and the internal pressure of the outer casings 22 and 23 becomes higher than the external pressure, as shown in FIG. the inner pressure was opened 30b cuts acts on the valve element 24 in the direction, that the arrow P ₂ direction as the pressure inside and outside is balanced, the inside air from the notch 30b is pressure adjusted flow out exterior blood 22,23 Done.

In this embodiment, the example in which the mounting position of the valve body 24 is set at the bottom of the first exterior body 22 is shown. However, the present invention is not limited to this, and the side part of the first exterior body 22 is not limited thereto. Alternatively, the mounting position may be set to the second exterior body 23 or both exterior bodies 22 and 23 without any problem.

Further, in this embodiment, the case where the valve body is the cylindrical valve body 24 is shown, but the valve body may be made of an elastic film, and the shape is not particularly limited.

Further, the number of the through holes 22b, the valve bodies 24, and the like in the present invention is, of course, not limited to the above-described embodiment.

[0032]

As described above, according to the present invention, at least one of the two exterior bodies is provided with a through hole that opens in and out, and the through hole is opened and closed by the pressure difference between the two exterior bodies. When the valve body is opened due to the pressure difference between the inside and outside of the exterior body, the inside / outside air moves from the high side to the low side to absorb the pressure difference inside and outside the exterior body.

Therefore, the amount of deformation of the valve body as the pressure absorbing mechanism is small, so that it is not necessary to secure a large space in the exterior body for absorbing the amount of deformation of the pressure absorbing mechanism as in the prior art. The size of the exterior body can be reduced.

Further, the fact that the amount of deformation of the valve body is small is as follows.
Since there is almost no restriction on the mounting of electronic devices, the degree of freedom in mounting electronic devices in the exterior body can be increased.

According to the fourth aspect of the present invention, since the protective wall is provided on the cover so as to protrude in a direction inclined with respect to the axial direction of the air inflow / outflow hole, even if rainwater or the like enters the cover through the air outflow / inflow hole. Blocked by the protective wall, it is possible to prevent rainwater or the like from entering the exterior body.

[Brief description of the drawings]

FIGS. 1A and 1B are a plan view and a cross-sectional view showing a main part of an electronic device housing according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing an electronic device housing according to the first embodiment of the present invention.

FIG. 3 is a partial cross-sectional view showing the electronic device housing according to the first embodiment of the present invention.

FIGS. 4A to 4C are cross-sectional views illustrating the operation of the pressure absorbing mechanism of the electronic device housing according to the first embodiment of the invention.

FIGS. 5A and 5B are cross-sectional views illustrating the operation of a conventional pressure absorbing mechanism of an electronic device housing (1).

FIGS. 6A and 6B are cross-sectional views illustrating the operation of a conventional pressure absorbing mechanism of an electronic device housing (2).

[Explanation of symbols]

 Reference Signs List 21 housing for electronic device storage 22 first exterior body 22a opening 22b through hole 23 second exterior body 24 valve body 26 electronic device 28 packing 30 cylindrical portion 30b notch

Claims (4)

[Claims] 1. A first exterior body having an opening for accommodating an electronic device, and a second exterior body removably disposed on the first exterior body via a seal member and capable of opening and closing the opening. In the electronic device storage case provided, at least one of the two exterior bodies is provided with a through hole that opens inside and outside, and a valve that opens and closes in this through hole by a pressure difference between the outside and inside of the two exterior bodies. A housing for electronic equipment, wherein the body is mounted. 2. The electronic device housing according to claim 1, wherein the valve body is formed of an elastic film having a substantially cross-shaped cut. 3. The valve body according to claim 1, wherein a cover having an air outflow / inflow hole is attached to the valve body.
The electronic device housing according to the above. 4. The electronic device housing according to claim 3, wherein the cover is provided with a protective wall protruding in a direction inclined with respect to an axial direction of the air inflow / outflow hole.