JPH1022653A - Waterproof structure of cabinet having vent hole - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make possible ensuring waterproof of a cabinet, by installing a floating plug which is retained vertically movably along the co-axis with the central axis of annular vent holes which are divided into a plurality of numbers, on a bottom part of the cabinet, and choking and closing the annular vent holes with the floating plug when buoyancy is generated on the floating plug by seat water or the like. SOLUTION: A funnel type floating plug 4 is arranged below a vent hole. A retaining arm 1A is formed by monolithic molding with a cabinet. The floating plug 4 is composed of material having elasticity in which specific gravity is smaller than water and sea water, and adherence with annular vent holes is excellent. The upper surface of the floating plug is nearly spherical. Since the annular vent holes 3 are formed between the cabinet bottom part and the upper surface of the floating plug 4, the inside of the cabinet and the outside are linked by air flow F, and the pressure inside the cabinet coincides with the external atmosphere pressure. When seat water collides against the floating plug 4 by violet waves, the floating plug 4 is lifted upward, and the upper surface of the floating plug 4 chokes and closes the annular vent holes 3. Thereby the cabinet 1 is made the water-tight and closed state to the outside, and waterproof of the cabinet can be ensured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waterproof housing structure for electronic equipment used outside a ship, such as a deck of a ship having a ventilation hole for matching the internal pressure of the housing with the pressure of the external atmosphere, and in particular, to a waterproof housing structure. Unlike equipment installed on land, it not only prevents the entry of raindrops etc. from above, but also prevents the intrusion of seawater etc. due to intense waves from the bottom of the housing with this ventilation hole, and in any shaking state of the ship The present invention relates to a waterproof housing structure capable of reliably preventing seawater, rainwater, and the like from entering through a ventilation hole.

[0002]

2. Description of the Related Art In a conventional waterproof housing structure, a vent hole is provided on the bottom surface of the housing to adjust pressure with an external atmosphere.
Seawater, dew, or the like that has entered the inside of the housing through the ventilation hole is discharged from the ventilation hole. This is a method generally used in an equipment housing installed on land.
In addition, in the conventional example shown in FIGS. 4 and 5, an elastic hose 2 made of rubber or the like as a ventilation hole is attached to the bottom surface of the housing in consideration of mounting outside the ship such as the deck of a ship, and pressure adjustment with an external atmosphere is performed. In some cases, when a strong wave is applied, the central part of the elastic hose 2 is bent by the pressure of the wave to bend the elastic hose, thereby preventing water from entering the hose.

[0003]

However, in such a conventional structure, when it is mounted outside the vessel such as the deck of a ship, it is completely vulnerable to water entering through the vent holes on the bottom of the housing. Water is allowed to enter, causing a failure of electronic devices inside the housing. Moreover, in the conventional example in which the elastic hose is attached, it is necessary to secure a space where the end of the hose can be freely bent, and the desired effect can be achieved even if the hose is set too short. In addition, if the hose diameter is too small, there is an inconvenience that the water sucked in by the surface tension of the water cannot be discharged.

In addition, in a state where the entire apparatus is submerged by a violent large wave, no waterproof effect can be expected. In addition, water that once enters the housing cannot be discharged to the outside, and repeatedly evaporates and condenses in response to temperature changes inside the housing. There has been an inconvenience that a circuit or the like may malfunction.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems of the prior art, the present invention relates to a housing having a ventilation hole for maintaining a good balance between the pressure inside the housing and the external atmospheric pressure. An annular vent divided into a plurality at the bottom of the housing, and a float supported so as to be able to move up and down on the same axis as the central axis of the annular vent. When buoyancy is generated, the annular vent hole is configured to be closed and sealed by the float.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described in detail with reference to FIGS.

As can be seen from the cross-sectional view of FIG. 1, a funnel-shaped floating plug 4 is provided below the vent hole 3 so as to be vertically movable by a support arm 1A integrally formed with the housing 1. I have. The buoy 4 has a specific gravity smaller than that of water or seawater (a specific gravity is small so that the buoyancy is generated even if the weight of the reflector is added), and is elastic and has good adhesion to the annular ventilation hole. It is made of a material, and is configured such that its upper surface is substantially spherical.

Due to the spherical shape, the desired effect can be achieved even if the buoy is slightly inclined. In the normal state, as shown in FIG. 1, the annular ventilation hole 3 is formed between the bottom of the housing and the upper surface of the floating plug 4, so that the inside and the outside of the housing are electrically connected by the airflow F, The pressure inside the housing matches the external atmosphere pressure. Also, when seawater hits the buoy due to intense waves, the buoy 4 is pushed upward, and as shown in FIG.
Close and seal. Therefore, the housing 1 is in a watertight and airtight state with respect to the outside. In order to prevent the float 4 from receiving an undesired inclination due to a transverse wave, a wave preventing ring 1B is provided at the bottom.

At the top of the buoy 4 is a circular crown-shaped reflector 5.
Is fixed, so that the floating plug is held, and even if there is a sudden pressure fluctuation inside and outside the housing, there is an effect that the rapid air flow is alleviated by the reflection plate 5. When the annular ventilation hole 3 is released from the float 4 as shown in FIG. Absent. Also, when a strong splash from the lower side occurs, the floating plug 4 comes into contact with the annular ventilation hole 3 to close and seal the annular ventilation hole as described above. Therefore, raindrops and the like adhering to the periphery of the annular ventilation hole 3 do not enter the inside of the housing.

In the above-described embodiment, the shape is such that a plurality of annular ventilation holes are arranged substantially on a perfect circle. However, the present invention is not limited to such a shape. Even so, the same effect can be achieved with any shape as long as the adhesion with the buoy is achieved. Further, the reflection plate is not limited to those shown in FIGS. 1 and 2, and may be, for example, a reflection plate having a shape as shown in FIG. That is, the height H is longer than that of FIG. 1 and the lower end of the reflector comes into contact with the bottom surface inside the housing in the state of the float shown in FIG. 1 and has many openings (air flow holes) 6 in that state. Is fine. In addition, if the annular ventilation hole portion is made of an elastic body, the float may be a rigid body instead of an elastic body.

[0011]

As described above, according to the present invention, a casing for use outside a ship, such as a deck of a ship containing electronic equipment,
Waterproofing and sealing are possible not only for the wind and rain but also for the severe wave splash from below. Therefore, the waterproof housing of the present invention can be reliably waterproofed regardless of any installation conditions, and high reliability can be ensured.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing a state in which an annular ventilation hole is released from a buoy.

FIG. 2 is a schematic cross-sectional view showing a state where an annular ventilation hole is closed and sealed by a buoy.

FIG. 3 is a perspective view showing a modification of the reflection plate.

FIG. 4 is a perspective view showing a waterproof casing provided with a conventional elastic hose.

FIG. 5 is a schematic sectional view showing the structure of an elastic hose.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Housing 1A Support arm 1B Wave prevention ring 2 Elastic hose 3 Annular ventilation hole 4 Float 5 Reflector 6 Opening F Air flow

Claims (5)

[Claims] 1. A casing having a vent for matching the internal pressure of the casing with the external atmospheric pressure, a plurality of annular vents formed at the bottom of the casing, and a center of the annular vent. A shaft and a float supported so as to be able to move up and down on the same axis, and when the float is caused to float by seawater or the like, the annular vent is closed and sealed by the float. A waterproof structure for a housing having a ventilation hole, wherein the waterproofness of the housing is ensured. 2. The waterproof structure according to claim 1, wherein the float is made of a material having a specific gravity smaller than that of water. 3. The waterproof structure according to claim 1, wherein an upper surface of the float is substantially spherical. 4. The waterproof structure for a housing having a vent according to claim 1, wherein the float is made of an elastic material having a specific gravity smaller than that of water. 5. A floating plate according to claim 1, wherein a reflecting plate is fixed above the floating plug, the floating plate is held by the reflecting plate, and rapid air changes even when a sudden pressure fluctuation inside and outside the housing occurs. A waterproof structure for a housing having a vent hole, wherein a flow is reduced.