JP2004251770A - Water immersion warning system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water immersion warning system for a ship which gives an alarm according to water immersion level in order to prevent a foundering accident of a cargo ship as requested by International Maritime Organization for installation, where a sensor part can be checked even under existence of a cargo. <P>SOLUTION: This system comprises a sensor means 2 provided with at least two electrodes 2a, 2b vertically in an insulator base 2c with a prescribed distance, a warning means 3 giving the alarm on receiving a detection signal from the electrodes 2a, 2b, and a checking means 4 checking whether the sensor means 2 connected with the electrodes 2a, 2b normally works or not. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an inundation alarm device that can be applied to a ship or the like that issues a warning when a cargo hold of a cargo ship is flooded at a predetermined water level or higher to ensure ship safety.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a bulk carrier of a ship type called a bulk carrier that mainly performs sea freight transportation has been frequently used. As shown in FIG. 7, a plurality of independent cargo holds A are arranged in a ship as shown in FIG. Each cargo hold A is covered with a large lid B called a hatch cover to prevent intrusion of seawater or the like, and the cargo hold A is not provided with a flood alarm device.
[0003]
[Problems to be solved by the invention]
In recent years, there has been an accident that the cargo ship sinks due to flooding from the gap of the hatch cover B that covers the cargo hold A of the conventional cargo ship due to a storm or the like. In order to ensure the safety of the ship, it is obliged to install a device that monitors the water level in the hold and issues an alarm when it is flooded. The requirements for the installation are the following four items:
(1) The sensor has an explosion-proof structure,
(2) Protective structure that will not be damaged even if it comes into contact with cargo loaded in the hold,
(3) Inspection can be performed,
(4) Issue an inundation alarm at a position about 500 mm from the lower part of the cargo hold, and issue an exit warning at a position of about 2000 mm.
[0004]
It is an object of the present invention to provide a marine inundation alarm device that meets all the requirements of these IMOs and that can check the sensor section even if there is cargo.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a sensor means for detecting a water level by providing at least two electrode bodies at a predetermined interval on an insulator base and receiving a detection signal from the electrode body. An alarm means for issuing an alarm and an inspection means connected to the electrode body for inspecting whether or not the sensor means operates normally.
[0006]
BEST MODE FOR CARRYING OUT THE INVENTION
A first embodiment of the present invention will be described with reference to FIGS.
[0007]
Reference numeral 1 denotes a marine inundation alarm device according to a first embodiment of the present invention. The marine inundation alarm device 1 receives a sensor 2 for detecting a water level and a detection signal from the sensor 2. Alarm means 3 for issuing an alarm, and inspection means 4 connected to the sensor means 2 for inspecting whether or not the sensor means 2 operates normally.
[0008]
The sensor means 2 comprises one electrode body 2a, the other electrode body 2b, and an insulator base 2c, and these two electrode bodies 2a, 2b are vertically provided on the insulator base 2c at predetermined intervals. .
[0009]
Each of the electrode bodies 2a and 2b includes an outer detection electrode section 5 and an inner inspection electrode section 6, and the detection electrode section 5 is formed in a bottomed cylinder, and a cylindrical insulating member is provided in the cylinder. 7, the rod-shaped inspection electrode portion 6 is inserted, and the bottom inner portion 5b of the detection electrode portion 5 and the lower end portion of the inspection electrode portion 6 are securely contacted by screwing or the like. Except for the contact part 6a, the inspection electrode part 6 and the detection electrode part 5 are formed in a double electrode structure insulated by an insulating member 7.
[0010]
The detection electrode section 5 was formed of a corrosion-resistant material such as a gold plating material, platinum, and stainless steel.
[0011]
The two electrode bodies 2a and 2b are mounted on the sensor housing 2d via the insulating base 2c. Below the sensor housing 2d, the water level detecting portions 5a and 5a of the two electrodes 2a and 2b are connected to the electrode cover 2e. A plurality of water entry holes 2f are opened in the electrode cover 2e, and a front cover 2g for inspection such as a terminal plate is packed in a central front opening of the sensor housing 2d. In addition, an opening 2h through which a conductive wire is inserted is formed in an upper portion of the sensor housing 2d.
[0012]
The alarm means 3 is an alarm device having a configuration such as a relay device 3a and an alarm buzzer provided in a bridge or the like. The detection electrode unit 5 of the one electrode body 2a is connected to a positive current terminal 3b of the relay device 3a. The detection electrode 5 of the other electrode body 2b is connected to the negative current terminal 3c via the conductor 8b, and if the water reaches a predetermined water level, the connection between the two electrode bodies 2a and 2b is established. Is turned on through water, and activates the relay device 3a to issue an alarm. The alarm means 3 issues an inundation alarm at a position of about 500 mm from the lower part of the cargo hold A, or an evacuation alarm at a position of about 2000 mm. Is set to emit.
[0013]
If the relay device 3a is formed of, for example, an intrinsically safe explosion-proof structure relay device, the international maritime organization IMO sensor can easily satisfy the requirement of the explosion-proof structure.
[0014]
The inspection means 4 comprises an open / close switch 4a for short-circuiting. One terminal 4b of the inspection switch 4a is connected to an upper part 6a of the inspection electrode portion 6 of the one electrode body 2a via a conducting wire 9a. The other terminal 4c of the other electrode 4a is connected to the upper part 6b of the inspection electrode portion 6 of the other electrode body 2b via a conducting wire 9b, and the open / close switch 4a is normally in an open OFF state. 4a is closed ON to check whether the sensor means 2 is normal or not in a short-circuit state in which the two electrode bodies 2a and 2b of the sensor means 2 are electrically connected. If the sensor means 2 is normal, the alarm means 3 issues an alarm. I made it.
[0015]
Next, a method of using the first embodiment of the present invention will be described.
[0016]
As shown in FIG. 4, in the cargo hold A of the cargo ship, sensor means are respectively provided at a first water level L1 of a flood warning and a second water level L2 of a discharge warning, which are requirements from the International Maritime Organization IMO. 2 is arranged, and from the sensor housing 2d of the sensor means 2, the conductor is protected by a conduit so as not to be damaged by cargo and connected to an alarm device in the bridge, and the water level position L1 , L2 is connected to a separate relay device 3a of the alarm device to enable each of the flooding alarm and the ship leaving alarm to be issued, and the inspection switch 4a is also separately provided for each sensor device 2. Connected to
[0017]
First, at the time of flood monitoring, the inspection switch 4a is turned off. If the cargo is flooded in the cargo hold A of the cargo ship by a storm or the like, the water level rises to reach L1, and the water level detecting portions of the two electrode bodies 2a and 2b serving as sensor means are detected. When both 5a and 5a are immersed in water, the current flows from the plus terminal 3b of the relay device 3a through the detection conductor 8a, from the upper terminal 5c of the detection electrode unit 5 of the one electrode body 2a to the water level detection unit 5a, The water flows from the water level detecting section 5a to the water level detecting section 5a of the other electrode body 2b through the water, flows from the upper terminal 5c through the detection conductor 8b, and flows in the forward path of the minus terminal 3c of the relay apparatus 3a. And the warning device issues a flood warning.
[0018]
When the water level further rises and reaches L2, the sensor means 2 and the warning means 3 at the position of L2 issue a warning of leaving the ship by the same operation as described above.
[0019]
Next, an inspection method will be described. In the state where the water level detecting portions 5a and 5a of the two electrode portions 2a and 2b, which are the sensor means, are not in the water, that is, in a normal state where there is no water in the cargo hold A, the inspection is periodically performed. When the inspection switch 4a, which is the means 4, is pressed and turned on, current flows from the plus terminal 3b of the relay device 3a through the detection conductor 8a, and from the upper terminal 5c of the detection electrode unit 5 of the one electrode body 2a to the water level detection unit. Inspection of the ON state through the inspection part 9a through the contact part 6a of the inspection electrode part 6 which is the only electric connection part with the bottom inner part 5b inside 5a, through the inspection lead wire 9a. It passes through the inspection lead wire 9b via the switch 4a, passes from the upper part 6b of the inspection electrode part 6 of the other electrode body 2b to the contact part 6a, and the other detection electrode part 5 which is the only electrical connection part with the contact part 6a. Bottom inner part 5b of After passing through the upper terminal 5c from the water level detector 5a on the outside thereof, flows from the detection conductor 8b to the minus terminal 3c of the relay device 3a, drives the relay device 3a, issues an alarm, and loads the cargo in the cargo ship A. Irrespective of this, it is possible to check that the sensor means 2 operates normally in a bridge of a ship or the like, and it is also possible to confirm that the connecting wires and the entire system operate normally.
[0020]
If the water level detecting portion 5a, which is the actual water level detecting portion of the electrode bodies 2a and 2b, is damaged or corroded, or the connection of the upper terminal 5c or the like is broken, the inspection switch 4a is pushed. Since no current flows, the relay device 3a does not operate, and thus it is known that the system has failed without entering the cargo hold A and performing an inspection, and the place where the inspection switch 4a is installed, For example, the quality of the system can be checked in the bridge of the ship.
[0021]
Further, whether one of the two electrode bodies 2a and 2b serving as the sensor means is out of order, in the case of one electrode body 2a, the continuity between the detection conductor 8a and the inspection conductor 9a is checked, and the other electrode body is checked. In the case of 2b, a faulty system can be confirmed by checking the continuity between the detection conductor 8b and the inspection conductor 9b, so that the inspection is facilitated.
[0022]
Here, when diverting the water level monitoring device of the sensor unit of various general float switch type, pressure sensor type, electrode type, etc. to the marine inundation alarm device, the biggest issue is to add the inspection method of the request from the IMO In most cases, when inspecting the sensor part, it is necessary for an inspector to enter the cargo hold A, raise and lower the float, generate false pressure, and short-circuit the electrodes. Inspection work is difficult if there is a load, but as described above, in the marine inundation warning device according to the embodiment of the present invention, even if an electrode-type sensor is It is composed of an electrode part and an inspection electrode part for inspection, and has a single electrical contact part between both electrodes, and is formed so that the inspection path matches the actual water level detection part. In a place Inspection work it is possible to check the difference becomes easy.
[0023]
Next, a second embodiment of the present invention will be described with reference to FIG.
[0024]
In the first embodiment, the sensor means 2 is disposed at each of the predetermined first water level position L1 and the second water level position L2. However, the marine inundation warning device 11 of the second embodiment is different from the sensor means 12 in the first embodiment. Only the alarm means 3 and the inspection means 4 are the same as in the first embodiment, and the sensor means 12 includes a long first water level electrode body 12a, a short second water level electrode body 12b, and a long It consists of three electrode bodies with a common electrode body 12c, and these three electrode bodies are vertically provided at a predetermined interval on an insulator base 12d. Each of the electrode bodies 12a, 12b, 12c is As in the case of the first embodiment, it is composed of a detection electrode section 15 having a double electrode structure, an inspection electrode section 16 and a cylindrical insulating member 17 connected by one contact section 15a.
[0025]
At the time of use, as shown in FIG. 6, the sensor means 12 is installed in the cargo hold A, and when the water level reaches the first water level position L1, water is interposed between the first water level electrode body 12a and the common electrode body 12c. When the water level rises to the second water level position L2, the current flows through the water between the second water level electrode body 12b and the common electrode body 12c. It will be in a state, and will issue a leaving alarm.
[0026]
Note that these electrode bodies 12a, 12b, and 12c are also covered with a durable protective member so as not to be damaged by contact with cargo.
[0027]
At the time of inspection, it is possible to confirm whether or not the system normally operates in a bridge of a ship or the like as in the first embodiment without an inspector entering the cargo hold A.
[0028]
【The invention's effect】
As described above, according to the present invention, the electrode body of the sensor means for detecting the water level in the hold is formed in a double electrode structure in which the detection electrode portion and the inspection electrode portion are connected at one contact portion, and the water level is detected. Since the detection part and the contact part for inspection are formed so as to match, the inspection can be performed reliably when the water level detection part, which is the actual sensor part, is damaged, etc., and the load is loaded in the hold. However, it is possible to confirm the quality of the system without entering the system, which has the effect of facilitating inspection work.
[Brief description of the drawings]
FIG. 1 is a system connection diagram according to a first embodiment of this invention.
FIG. 2 is a partially cutaway front view of the sensor means.
FIG. 3 is a side sectional view of the sensor means.
FIG. 4 is an explanatory view of the arrangement of sensor means in a hold.
FIG. 5 is an explanatory diagram of sensor means according to a second embodiment of the present invention.
FIG. 6 is an explanatory view of an arrangement of sensor means in a hold.
FIG. 7 is an explanatory sectional view of a conventional cargo ship.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 Flood warning device 2 for ship 2 Sensor means 2a One electrode body 2b The other electrode body 2c Insulator base 3 Warning means 3a Relay device 4 Inspection means 4a Inspection switch 5 Detection electrode part 6 Inspection electrode part 7 Insulation members 8, 9 Lead wire

Claims (6)

Sensor means for detecting a water level by providing at least two electrode bodies at predetermined intervals on the insulator base, alarm means for receiving a detection signal from the electrode bodies and issuing an alarm, An inundation alarm device comprising an inspection means connected to the inspection means for inspecting whether the sensor means operates normally. Each of the electrode bodies has a double electrode structure of an outer detection electrode section and an inner inspection electrode section, and the detection electrode section is formed in a bottomed cylinder, and a cylindrical insulating member is provided in the cylinder. 2. The flood alarm device according to claim 1, wherein the rod-shaped inspection electrode portion is inserted through the intermediary portion, and an inner bottom portion of the detection electrode portion contacts a lower end portion of the inspection electrode portion. 3. The detection electrode part of one electrode body is connected to one terminal on the input side of the alarm means, and the detection electrode part of the other electrode body is connected to the other terminal on the input side. The inundation alarm device according to claim 2, wherein an alarm is issued when the body becomes conductive through the liquid. The inspection means comprises an open / close switch, and one terminal of the open / close switch is connected to an inspection electrode part of one of the electrode bodies, and the other terminal of the open / close switch is connected to an inspection electrode part of the other electrode body. The inundation alarm device according to claim 2 or 3, wherein: The sensor means comprises a long first water level electrode body, a short second water level electrode body and a long common electrode body, each of which is a combination of two electrode bodies at each predetermined water level position. The flood alarm device according to any one of claims 1 to 4, comprising an electrode body, wherein the three electrode bodies are vertically provided at predetermined intervals on the insulator base. The inundation alarm device according to claim 5, wherein the alarm unit issues an inundation alarm at a predetermined first water level and an outboard alarm at a second water level.

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