JP2006327558A - Pressure reduction method using mixing gas - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inexpensive countermeasure method not using a mixing gas pressure reduction method only at specific system diving but easily using it for general diving work while sufficiently taking into consideration to not only insurance of conveyable property and insurance of easy operability but also reduction of cost at purchase, reducing risk of generation of decompression illness, and capable of further easily maintaining predetermined pressure reduction stop water depth when a diver is pressure reduction-stopped even if a hand and a leg are left from a diving rope and dropped off caused by rapid variation of tidal current, a course wave of another vessel navigating near it, deterioration of hydrographic phenomenon, fatigue or the like accompanying with passing of a time. <P>SOLUTION: In the pressure reduction method, a mixing gas feeding device constituted by a small size conveyable box body and an auxiliary device and a stopping device for preventing consumption and reduction of physical strength by an influence of a billow and a tidal current received by the diver during decompression are used. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a mixed gas pressure reducing method for reducing pressure using a device that supplies a mixed gas during pressure reduction when a diver performs diving that requires pressure reduction.

There is a conventional method for depressurizing diving, in which the depressurization stop time and the water depth are calculated from the diving work time table based on the diving work time and the diving work water depth, and the air is breathed.
In this method, only the diving time and the diving work depth are regarded as important. Many cases of decompression sickness have been reported even if the time is strictly observed.

  Also, when diving into specific systems such as on land, large ships, and offshore platforms, there is a method to enter the repressure chamber installed in the facility immediately after the dive, repressurize, and suck oxygen while depressurizing. However, since the size of the re-pressure chamber is large, it is heavy and cannot be transported, and the pressure control device is complicated and can only be operated by a specific person having high technology who is familiar with the device, and is extremely expensive. Therefore, it is not used during general diving work, and it has been a major drawback that it is not possible to provide a decompression method that is simple, safe and extremely inexpensive to anyone at any time, anywhere.

  In addition, when a diver stops at a reduced pressure, the diver will be held by a hand on the submarine that is marked with the depth of the decommission stop water depth, or the submersible will be entangled with the foot to fix the body and maintain the predetermined decompression stop depth. However, it is a method of spending the calculated time, but it is difficult to move from a submarine to a hand because of sudden changes in tidal currents, wake waves of other vessels that navigate nearby, deterioration of sea conditions, fatigue over time, etc. Even though it is difficult to maintain a predetermined decompression stop water depth due to the foot falling away, an easy and inexpensive countermeasure for preventing exhaustion and falling of physical strength has not been established.

"Diver text: Ministry of Health, Labor and Welfare, Occupational Health Division, Ministry of Health, Labor and Welfare", Central Industrial Accident Prevention Association, August 30, 2002, 3rd edition, p. 168-p. 177

  The problem to be solved is not to use the mixed gas decompression method only when diving on a specific system such as on land, large ships, and offshore platforms, but also to ensure portability and ease of operation. It is intended to reduce the risk of decompression sickness by paying sufficient attention to the price reduction at the time, making it easy to use widely during general diving work, increasing safety.

  Also, when the diver stops depressurizing, the hands and feet are separated from the submarine because of sudden changes in tidal currents, the wake waves of other ships that navigate nearby, deterioration of sea conditions, fatigue over time, etc. Even if it falls, it is easy to maintain a predetermined decompression stop water depth and to provide an inexpensive coping method that reduces exhaustion of physical strength after work.

  In order to solve the above-described problems, the present invention is directed to a mixed gas supply device composed of a small portable housing and ancillary devices, as well as exhaustion of physical strength due to the effects of waves, tidal currents, etc. received by a diver during decompression. It is a decompression method using a stop device for preventing the fall.

  The depressurization method using the mixed gas supply device and the stop device according to the present invention makes it possible to make the mixed gas depressurization method easy, safe and extremely inexpensive to be used by anyone and anyone during general diving work. As a result, the risk of developing decompression sickness can be significantly reduced compared with general air decompression methods.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  The mixed gas supply device used in the mixed gas decompression method shown in FIG. 1 is configured to shut off the air that has been supplied to the diver until the decompression is stopped, and to supply a new mixed gas. A mixed gas supply source 1, a mixed gas supply pipe 2, a regulator 3, and a switching valve 4.

  The mixed gas supply source 1 is filled with a mixed gas (nitrogen oxygen gas), and is supplied to the regulator 3 through the mixed gas supply pipe 2. The water is cleaned to a preferable state, and is supplied to the diver through the switching valve 4 when the diver decompresses.

  In the present invention, the mixed gas supply source 1 is an oxygen cylinder having a height of 80 cm, a capacity of 10 l, and a weight of 12 kg, and the adjuster 3 has a height of 20 cm, a lateral width of 30 cm, a depth of 20 cm, and a total weight of 9 kg. As a result, the portability and operability became extremely easy only by comparing with a conventional oxygen cylinder having a height of 170 cm, a capacity of 50 liters, and a weight of 60 kg used for decompression.

    The stop device used for the mixed gas decompression method shown in FIG. 2 is that when a diver stops depressurization, sudden changes in tidal currents, wake waves of other ships navigating nearby, deterioration of sea conditions, fatigue over time, etc. Even if a hand or foot falls away from the submarine cable due to the cause, it is configured for the purpose of facilitating the maintenance of a predetermined decompression stop water depth. 6. A fixture 7 is provided.

  The support rope 5 supports the stop tool 6, and the material, shape, and strength can stabilize the stop tool 6 when the diver is holding, standing, or sitting on the stop tool 6 when the decompression is stopped. Is preferred.

  The stop device 6 is used to hold, stand or sit when the diver stops decompression. The material, shape, and strength of the stop gear 6 can withstand the impact of the diver when holding, standing or sitting. Preferably it can be obtained.

  Fixture 7 is accompanied by a sudden change in tidal current when a diver is stopped by decompression stop, standing, or sitting, and the wake wave of other ships that navigate nearby, deterioration of sea conditions, and the passage of time. It is intended to make it easier to maintain a predetermined decompression stop water depth without falling even if it is separated from the stop tool 6 due to fatigue or the like, and can bind the stop tool 6 and the diver. A material that is suitable for allowing a diver to hold down at a decompression stop, to stand or sit, and to prevent the diver from stopping the decompression, prevent falling, and easily maintain the decompression stop water depth. Has shape and strength.

It is a composition flow figure of the mixed gas supply device to which the present invention is applied. It is a side view of the stop device to which the present invention is applied.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Mixed gas supply source 2 Mixed gas supply piping 3 Adjuster 4 Switching valve 5 Supporting rope 6 Stopper 7 Fixing tool

Claims (2)

  A method for reducing the pressure of a mixed gas, comprising using a mixed gas supply device comprising a small portable housing and an auxiliary device.   A mixed gas decompression method characterized by using a stop device for preventing exhaustion or falling of physical strength due to the influence of waves or tidal currents received by a diver during decompression.

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