JP5046102B2 - Air bubble suction prevention water intake device - Google Patents
Air bubble suction prevention water intake device Download PDFInfo
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- JP5046102B2 JP5046102B2 JP2007208338A JP2007208338A JP5046102B2 JP 5046102 B2 JP5046102 B2 JP 5046102B2 JP 2007208338 A JP2007208338 A JP 2007208338A JP 2007208338 A JP2007208338 A JP 2007208338A JP 5046102 B2 JP5046102 B2 JP 5046102B2
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- water
- intake
- vortex
- water intake
- water flow
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Description
本発明は、船舶の水面下における外板部などに形成される取水口に関し、特に上記取水口を横切ろうとする水流に含まれている気泡が、同取水口の内部へ取り込まれるのを防止できるようにした気泡吸引防止型取水口装置に関する。 The present invention relates to a water intake formed in an outer plate portion or the like under the water surface of a ship, and in particular, air bubbles contained in a water flow that attempts to cross the water intake are prevented from being taken into the water intake. The present invention relates to a bubble suction-preventing water intake device that can be used.
一般に、船舶では、主機関のための冷却水などに必要な外水を取り込むため、水面下で船体外板部に取水口が形成されており、同取水口を通じポンプにより外水を吸引する配管系が設けられている。
ところで、上記取水口を通じ吸引される外水中には、かなりの気泡を含むことがあり、このような気泡を含んだエンジン冷却水では、十分な冷却効果を得ることができない。
そこで、従来は、上記取水口を緩やかに覆う後端開口の箱状バッファープレートなどを船体外板面に取付けることにより、気泡の吸入を防止しようとする手段が採用されているが、上記のような箱状バッファープレートを設けると、船舶の航走に対し大きな抵抗をもたらすほか、上記バッファープレートの下流側に淀み域を発生し、却って気泡の滞留を招くという不具合がある。
In general, in order to take in external water necessary for cooling water for the main engine in a ship, a water intake is formed in the hull outer plate part under the surface of the water, and a pipe that draws external water by a pump through the water intake A system is provided.
By the way, the outside water sucked through the water intake may contain a considerable amount of air bubbles, and engine cooling water containing such air bubbles cannot provide a sufficient cooling effect.
Therefore, conventionally, means for preventing the inhalation of air bubbles has been adopted by attaching a box-shaped buffer plate or the like having a rear-end opening that gently covers the intake port to the hull outer plate surface. If a box-like buffer plate is provided, there is a problem that a large resistance is given to the navigation of the ship, a stagnation region is generated on the downstream side of the buffer plate, and bubbles are retained.
本発明は、水面下の船体外板部などにおいて、水の流れ方向に沿う開口面を備えた取水口を通じ外水を取り込む際に、上記の水の流れに含まれる気泡を、上記開口面に沿い発生させた渦流の内部に閉じ込めて下流側へ流すことにより、上記取水口へ流入する外水の内部への気泡混入を極力防止できようにした、気泡吸引防止型取水口装置を提供することを課題とする。 The present invention, when taking outside water through a water intake having an opening surface along the water flow direction in a hull outer plate portion or the like below the water surface, bubbles contained in the water flow are introduced into the opening surface. To provide a bubble suction-prevention type intake device that is able to prevent bubbles from entering the outside water flowing into the intake port as much as possible by confining it inside the swirl generated along the flow and flowing it downstream. Is an issue.
前述の課題を解決するため、本発明の気泡吸引防止型取水口装置は、水中で水の流れの方向に沿うように開口面を備えた取水口において、取水の際に上記水の流れに含まれる気泡の吸引を防止すべく、上記水の流れの上流側における上記取水口の外周前縁部に、同取水口の開口面に沿い渦流を発生させて同渦流の内部に上記気泡を閉じ込めるための渦流発生部が設けられており、上記渦流発生部が、上記取水口の外周前縁部に沿い列設された多数の突起部として設けられていることを特徴としている。 In order to solve the above-mentioned problems, the air bubble suction type intake device of the present invention is included in the water flow at the time of water intake in an intake port having an opening surface along the direction of the water flow in water. In order to prevent the suction of bubbles, a vortex is generated along the opening surface of the water intake at the upstream peripheral edge of the water intake upstream of the water flow to confine the air bubbles inside the vortex. The eddy current generating part is provided , and the eddy current generating part is provided as a large number of protrusions arranged along the outer peripheral front edge of the intake port .
さらに、本発明の気泡吸引防止型取水口装置は、上記突起部が、三角錐として形成されて、同三角錐の尖端部の1つを上記水の流れの上流側に向けて配設されていることを特徴としている。 Furthermore, in the bubble suction preventing water intake device of the present invention, the protrusion is formed as a triangular pyramid, and one of the pointed ends of the triangular pyramid is arranged toward the upstream side of the water flow. It is characterized by being.
上述の本発明の気泡吸引防止型取水口装置では、水中で水の流れの方向に沿うように開口面を備えた取水口において、上記水の流れの上流側における同取水口の外周前縁部に渦流発生部が設けられ、同渦流発生部から発生した渦流の内部に、上記水の流れに含まれた気泡が閉じ込められるので、上記取水口には気泡をほぼ取り除かれた水が吸い込まれるようになり、気泡の大部分は上記取水口に吸い込まれることなく、後方へ向かう水と共に流れ去るようになる。
このようにして、上記取水口を通じ吸入された外水が船舶のエンジン冷却水として用いられると、冷却水に含まれる気泡の大幅な減少により、エンジン冷却効率の向上が期待される。
In the above-described bubble suction preventing type intake device of the present invention, in the intake port having an opening surface along the direction of the water flow in water, the outer peripheral front edge portion of the intake port on the upstream side of the water flow A vortex generator is provided in the vortex, and the bubbles contained in the water flow are confined inside the vortex generated from the vortex generator, so that the water from which the bubbles are almost removed is sucked into the intake port. Thus, most of the bubbles flow away with the water going backward without being sucked into the water intake.
In this way, when the outside water sucked through the water intake is used as the engine cooling water for the ship, the engine cooling efficiency is expected to be improved due to the significant reduction of bubbles contained in the cooling water.
また、上記渦流発生部が、上記取水口の外周前縁部に沿い列設された多数の突起部として形成されているので、同突起部で発生した多数の縦渦としての渦流の内部に、上記水の流れに含まれる気泡が効率よく閉じ込められるようになり、上記取水口への気泡の吸引が十分に防止されるようになる。 Further, the vortex generating portion, because it is formed as a number of projections which are columns set along the outer peripheral front edge of the water inlet, inside the vortex as a number of vortices generated in the projections, Air bubbles contained in the water flow are efficiently trapped, and the suction of air bubbles into the water intake is sufficiently prevented.
そして、上記突起部が三角錐として形成されて、同三角錐の尖端部の1つを上記水の流れの上流側に向けて配設されることにより、上記の縦渦としての渦流の発生が十分に行われるようになって、同渦流の内部へ水中気泡を閉じ込め流し去る作用も十分に行われるようになり、このようにして上記取水口への気泡吸引防止効果が、ほぼ完璧な状態で達成されるほか、上記の三角錐としての突起部は小さくてすみ、また同突起部による水流の淀み域の発生も十分に抑制できるようになるので、船舶に適用した場合は同突起部による航行時の船体抵抗の増加を最小限に抑えることが可能になる。 And the said protrusion part is formed as a triangular pyramid, and generation | occurrence | production of the vortex | eddy_current as said vertical vortex is arrange | positioned by arrange | positioning one of the tip parts of the said triangular pyramid toward the upstream of the said water flow. As a result, the action of trapping and discharging the underwater bubbles inside the vortex is sufficiently performed, and in this way, the effect of preventing the suction of bubbles to the intake port is almost perfect. In addition to being achieved, the projections as the above-mentioned triangular pyramids can be small, and the generation of water stagnation areas due to the projections can be sufficiently suppressed. It is possible to minimize the increase in hull resistance over time.
図1は本発明の一実施例としての気泡吸引防止型取水口装置を船舶の水面下の船体外板部に設けられるシーチュストに適用した場合を示す正面図、図2は上記取水口装置における突起部の作用を示す説明図である。 FIG. 1 is a front view showing a case where a bubble suction-type intake device as an embodiment of the present invention is applied to a seast provided on a hull outer plate portion under the surface of a ship, and FIG. 2 is a projection in the intake device. It is explanatory drawing which shows the effect | action of a part.
図1に示すように、船舶の水面下における船体外板Sに形成された取水口1に接続されるシーチェスト2には、図示しない吸引ポンプ付き配管が接続されて、船外の水が、取水口1およびシーチェスト2を通じ、この船舶の主機関の冷却水系などへ送られるように構成されている。
As shown in FIG. 1, a pipe with a suction pump (not shown) is connected to a
そして、この船舶の航行中に、船体外板Sに沿い相対的にW方向へ流れる外水に含まれた気泡が、取水口1を通じてシーチェスト2内へ流入するのを防止するため、同取水口1の外周前縁部に、渦流発生部としての多数の突起部3が列設されている。
In order to prevent air bubbles contained in the outside water flowing in the W direction relatively along the hull outer plate S from flowing into the
本実施例では、各突起部3は、三角錐として形成されて、同三角錐の尖端部3aの1つを、W方向の相対的水の流れの上流側に向けるように配設されている。
In the present embodiment, each
上述の本実施例の気泡吸引防止型取水口装置では、水中で水の流れの方向Wに沿うように開口面を備えた取水口1において、上記水の流れの上流側における同取水口1の外周前縁部に、突起部3としての渦流発生部が設けられ、同渦流発生部から図2に示すように発生した渦流Vの内部に、上記水の流れに含まれた気泡が閉じ込められるので、取水口1には気泡をほぼ取り除かれた水が吸い込まれるようになり、気泡の大部分は取水口1に吸い込まれることなく、後方へ向かう水と共に流れ去るようになる。
このようにして、取水口1およびシーチェスト2を通じ吸入された外水が船舶のエンジン冷却水として用いられると、冷却水に含まれる気泡の大幅な減少により、エンジン冷却効率の向上が期待される。
In the bubble suction prevention type intake device of the above-described embodiment, in the intake port 1 having an opening surface along the water flow direction W in water, the intake port 1 on the upstream side of the water flow is the same. Since the eddy current generating part as the
In this way, when the outside water sucked through the water intake 1 and the
また、上記渦流発生部が、取水口1の外周前縁部に沿い列設された多数の突起部3として形成されることにより、同突起部3で発生した多数の縦渦としての渦流Vの内部に、上記水の流れに含まれる気泡が効率よく閉じ込められるようになり、取水口1への気泡の吸引が十分に防止されるようになる。
Further, since the eddy current generating portion is formed as a large number of
そして、突起部3が三角錐として形成されて、同三角錐の尖端部3aの1つを上記水の流れの上流側に向けて配設されることにより、上記の縦渦としての渦流Vの発生が十分に行われるようになって、同渦流Vの内部へ水中気泡を閉じ込め流し去る作用も十分に行われるようになり、このようにして取水口1への気泡吸引防止効果が、ほぼ完璧な状態で達成されるほか、三角錐としての突起部3は小さくてすみ、また同突起部3による水流の淀み域の発生も十分に抑制できるようになるので、船舶に適用した場合は同突起部3による航行時の船体抵抗の増加を最小限に抑えることが可能になる。
Then, the
なお、突起部3としては、三角錐の代わりに、螺旋面を外周に具えたねじ棒状のものなど適宜の形状のものを採用してもよい。
In addition, as the
1 取水口
2 シーチェスト
3 突起部
3a 三角錐尖端部
S 船体外板
V 渦流
W 水の流れの方向
DESCRIPTION OF SYMBOLS 1
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JP2007208338A JP5046102B2 (en) | 2007-08-09 | 2007-08-09 | Air bubble suction prevention water intake device |
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