Ventilation – Electronic cabinet
Reexamination Certificate
1999-09-01
2001-08-14
Lu, Jiping (Department: 3749)
Ventilation
Electronic cabinet
C055S385600
Reexamination Certificate
active
06273812
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a hermetic type outdoor equipment provided with a respiratory structure capable of preventing invasion of rain water, dust, etc. into the equipment via a respiratory hole formed through a hermetic case to ensure entrance and exit of air. The present invention is applicable to a hermetic type equipment provided with the respiratory structure such as radio relay equipment which is disposed outdoors.
2. Description of the Related Art
In such a hermetic type outdoor equipment, the air in a case of the equipment is warmed by a thermal effect of solar radiation, and the inner pressure may be increased due to the difference between the temperature of the inner air and the temperature of the outside air. In order to avoid the increase of pressure in the case and to radiate the inner heat to the outside, a structure for respiration (respiratory structure) for exit of the air in the case to the outside and for entrance of the outside air into the case is required. Accordingly, it is a general method that a respiratory hole is formed at a bottom portion of the case or the like at which invasion of rain water can be avoided, and a mesh member or a minute-hole sheet is mounted on the respiratory hole to keep a desired respiratory action.
For example, as shown in
FIG. 1
, a respiratory hole
14
is formed in the bottom protion of a case
13
in which a device, not shown, is accommodated. A minute-hole sheet
15
made of synthetic resin is arranged in the case
13
at a position correspnding to the respiratory hole
14
. A plate
16
having an opening
16
a
at a position corresponding to the respiratory hole
14
is superimposed to the minute-hole sheet
15
. The plate
16
and minute-hole sheet
15
are fixed to the case
13
by means of screws
17
.
As shown in
FIG. 2
, minute-holes
15
a
are formed in the entire region of the minute-hole sheet
15
, and a central area
15
b
of the minute-hole sheet
15
is exposed to the outside via the respiratory hole
14
.
Bird lice, etc. inhabiting the environment around the hermetic type outdoor equipment provided with the respiratory structure have such a behavior (thermal attraction) that they gather in the neighborhood of the respiratory hole
14
in response to specific temperature range atmosphere, particularly in a temperature range atmosphere which is generated by the exit of the heated inner air to the outside via the respiratory hole
14
due to their growth instinct, and thus the minute-hole sheet
15
is bit ten and broken by the bird lice gathering at the respiratory hole
14
, so that the bird lice are allowed to invade into the case
13
and thus cause the failure of the device.
SUMMARY OF THE INVENTION
The present invention has been implemented in view of the foregoing situation, and has an object to provide a hermetic type outdoor equipment provided with a respiratory structure which is improved so that the equipment can be prevented from being damaged by bird lice, etc. with keeping waterproof and dustproof properties.
In order to attain the above object, there is provided a hermetic type outdoor equipment provided with a respiratory structure, the respiratory structure comprising a minute-hole sheet applied to a respiratory hole of a case of the equipment, the minute-hole sheet being air-permeable and water-impermeable, and capillary members implanted outwardly on the minute-hole sheet.
The minute-hole sheet may be disposed at the inner surface side of the case, and the capillary members extend outwardly within the respiratory hole. The respiratory structure may further comprise a plate having an opening at a position corresponding to the respiratory hole and superimposed to the minute-hole sheet, and means for fixing the plate and the minute-hole sheet to the case.
According to the present invention, the tip ends of the capillary members function to effectively hinder the bird lice, etc. from moving toward the minute-hole sheet, so that the bird lice, etc. are prevented from biting and breaking the minute-hole sheet. Therefore, even when bird lice, etc. are about to invade into the equipment via the respiratory hole, they are prevented from invading into the case of the equipment by the capillary members, and an electrical failure can be prevented from occurring due to the invasion of bird lice, etc. in the equipment.
REFERENCES:
patent: 4981805 (1991-01-01), Yazawa et al.
patent: 9-13609 (1997-01-01), None
Lu Jiping
NEC Corporation
Young & Thompson
LandOfFree
Hermetic type outdoor equipment provided with respiratory... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Hermetic type outdoor equipment provided with respiratory..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Hermetic type outdoor equipment provided with respiratory... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2498420