JP5073710B2 - Microbubble generator in ship hull - Google Patents

Microbubble generator in ship hull Download PDF

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JP5073710B2
JP5073710B2 JP2009136888A JP2009136888A JP5073710B2 JP 5073710 B2 JP5073710 B2 JP 5073710B2 JP 2009136888 A JP2009136888 A JP 2009136888A JP 2009136888 A JP2009136888 A JP 2009136888A JP 5073710 B2 JP5073710 B2 JP 5073710B2
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bubbles
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discharge port
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康名 横井
義展 伊藤
利明 加藤
昌史 竹田
光一 久米
博之 伊藤
郁人 横井
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Anlet Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Description

本発明は、船体の没水表面に配置された多数の放出口から当該没水表面に気泡を放出して当該船体の摩擦抵抗を減少させる船体における微細気泡発生装置に関する。   The present invention relates to a fine bubble generating device in a hull that reduces the frictional resistance of the hull by discharging bubbles to the submerged surface from a number of discharge ports arranged on the submerged surface of the hull.

船舶の航行中における船体の流体摩擦抵抗を減少させるために、船体の没水表面に微細気泡（マイクロバブル）を放出して空気膜・空気層を形成する技術が下記の特許文献等により提案されている。一般に微細気泡は、船体表面に設けられた放出口から数メートル離れたところで消滅することが多く、船尾側に移動するに伴い複数の気泡は合体を繰り返しつつ徐々に大きくなることから船体の表面からの離脱も早くなり、流体摩擦抵抗の低減効果が小さくなる。   In order to reduce the fluid frictional resistance of the hull during navigation of the ship, the following patent document etc. proposes a technique for forming fine air bubbles (micro bubbles) on the submerged surface of the hull to form an air film / air layer. ing. In general, fine bubbles often disappear at a distance of several meters from the discharge port provided on the hull surface, and as the bubbles move gradually toward the stern side, the bubbles gradually increase while repeating coalescence. Detachment becomes faster and the effect of reducing fluid frictional resistance is reduced.

特許文献１には、船舶等の流体摩擦抵抗を低減することを目的として、船体の没水表面に複数のノズルを所定間隔に配置し、そのノズルから微細な凹凸を有する膜体表面に沿わせて空気を供給する方法が開示されている。   In Patent Document 1, for the purpose of reducing the fluid frictional resistance of a ship or the like, a plurality of nozzles are arranged at predetermined intervals on the submerged surface of the hull, and the nozzles are arranged along the surface of the film body having fine irregularities. A method of supplying air is disclosed.

特許文献２には、船体の没水表面に加圧気体を水中に噴出する噴出口を配置し、噴出口の下流位置に噴出口の内側壁と没水表面とを緩やかに接続した状態の誘導面を形成したマイクロバブル発生装置が開示されている。   In Patent Document 2, a jet outlet for jetting pressurized gas into the water is arranged on the submerged surface of the hull, and the inner wall of the jet outlet and the submerged surface are gently connected to the downstream position of the jet outlet. A microbubble generator having a surface is disclosed.

特許文献３には、船体の没水表面に設けた負圧形成部と、負圧形成部の後方に浅い凹部と深い凹部を前後に配置し、後方の深い凹部に加圧エアを供給する通路が設けられた摩擦抵抗低減船が開示されている。   Patent Document 3 discloses a negative pressure forming portion provided on a submerged surface of a hull, a passage in which a shallow concave portion and a deep concave portion are arranged at the front and rear of the negative pressure forming portion, and pressurized air is supplied to the deep concave portion at the rear. A frictional resistance reduction ship provided with is disclosed.

ところが、上記文献に記載されているような加圧空気や加圧気体（燃焼により生じたガス）のみを船体の没水表面に配置した放出口から噴出させる方法では、気泡が船体から離れ易く、摩擦抵抗が減少しにくい。このため、大量の空気を供給するには大形のブロワー、コンプレッサー等を設置しなければならず、設備費が高くなるという問題がある。   However, in the method in which only pressurized air or pressurized gas (gas generated by combustion) as described in the above-mentioned document is ejected from the discharge port arranged on the submerged surface of the hull, bubbles are easily separated from the hull. Friction resistance is hard to decrease. For this reason, in order to supply a large amount of air, a large blower, a compressor, etc. must be installed, and there is a problem that the equipment cost becomes high.

特開平７−１７４７６号公報Japanese Patent Laid-Open No. 7-17476 特開平９−１５０７８５号公報JP-A-9-150785 特開２００２−２５８２号公報Japanese Patent Laid-Open No. 2002-2582

本発明の目的は、吸い込んだ水に大量の空気を混入させることが可能なルーツポンプを用い、微細気泡が含まれた水の層を船体の没水表面に厚く形成して流体摩擦抵抗の減少を図る船体における微細気泡発生装置を提供することにある。   The object of the present invention is to reduce the fluid friction resistance by using a roots pump that can mix a large amount of air into the sucked-in water and forming a thick water layer containing fine bubbles on the submerged surface of the hull. An object of the present invention is to provide a device for generating fine bubbles in a ship hull.

前記目的を達成するために請求項１に記載した発明は、船体の没水表面に配置された多数の放出口から当該没水表面に気泡を放出して当該船体の摩擦抵抗を減少させる船体における微細気泡発生装置であって、
吸込口と吐出口を設けたポンプケーシング内に収められた一対の２葉若しくは多葉式ルーツロータを駆動モータにより回転自在に設けたルーツポンプと、その吸込口に一端を接続し前記船体に設けられた取水口に他端を接続した吸入管と、その吐出口に一端を接続し前記放出口に他端を接続した排出管とを備え、その吸入管に連通する管路に空気導入口と、吸い込んだ水を内蔵された衝突部材に衝突させる気泡発生管とを設け、
その衝突部材は、前記気泡発生管の大径部の内底に載せられるリングから上方へ延びる脚の上端に円形板を一体に固定した形態とされ、
前記ルーツポンプの運転により前記取水口から水を吸い込むと共に前記空気導入口から取り込まれる空気が混合した水を前記気泡発生管の衝突部材に衝突させることにより多量の気泡を発生させ、かつ、前記ルーツポンプによる圧縮作用により気泡を微細化し、その微細化された気泡が含まれた水を前記放出口から水中に吹き込むようにしたことを特徴とする。 In order to achieve the above object, an invention according to claim 1 is provided in a hull that reduces the frictional resistance of the hull by discharging bubbles to the submerged surface from a number of discharge ports arranged on the submerged surface of the hull. A microbubble generator,
A Roots pump in which a pair of two-leaf or multi-leaf root rotors housed in a pump casing provided with a suction port and a discharge port are rotatably provided by a drive motor, and one end connected to the suction port is provided in the hull. A suction pipe having the other end connected to the intake port, a discharge pipe having one end connected to the discharge port and the other end connected to the discharge port, and an air introduction port connected to the suction pipe; A bubble generating tube that collides the sucked water against the built-in collision member,
The collision member has a form in which a circular plate is integrally fixed to an upper end of a leg extending upward from a ring placed on the inner bottom of the large diameter portion of the bubble generating tube,
A large amount of bubbles are generated by causing water to be sucked from the water intake port by the operation of the roots pump and mixed with air taken in from the air inlet port to collide with a collision member of the bubble generation tube, and the roots It is characterized in that the bubbles are made fine by the compression action by the pump, and the water containing the refined bubbles is blown into the water from the discharge port.

同様の目的を達成するために請求項２に記載した発明は、船体の没水表面に配置された多数の放出口から当該没水表面に気泡を放出して当該船体の摩擦抵抗を減少させる船体における微細気泡発生装置であって、
吸込口と吐出口を設けたポンプケーシング内に収められた一対の２葉若しくは多葉式ルーツロータを駆動モータにより回転自在に設けたルーツポンプと、その吸込口に一端を接続し前記船体に設けられた取水口に他端を接続した吸入管と、その吐出口に一端を接続し前記放出口に他端を接続した排出管とを備え、その吸入管に連通する管路に空気導入口と、吸い込んだ水を内蔵された衝突部材に衝突させる気泡発生管とを設け、
その衝突部材は、所定厚さを有する半円形状とされていて、前記気泡発生管の大径部に互い違いに積み重ねて収められ、
前記ルーツポンプの運転により前記取水口から水を吸い込むと共に前記空気導入口から取り込まれる空気が混合した水を前記気泡発生管の衝突部材に衝突させることにより多量の気泡を発生させ、かつ、前記ルーツポンプによる圧縮作用により気泡を微細化し、その微細化された気泡が含まれた水を前記放出口から水中に吹き込むようにしたことを特徴とする。 In order to achieve the same object, the invention described in claim 2 is a hull that reduces the frictional resistance of the hull by discharging bubbles to the submerged surface from a number of discharge ports arranged on the submerged surface of the hull. A microbubble generator in
A Roots pump in which a pair of two-leaf or multi-leaf root rotors housed in a pump casing provided with a suction port and a discharge port are rotatably provided by a drive motor, and one end connected to the suction port is provided in the hull. A suction pipe having the other end connected to the intake port, a discharge pipe having one end connected to the discharge port and the other end connected to the discharge port, and an air introduction port connected to the suction pipe; A bubble generating tube that collides the sucked water against the built-in collision member,
The collision member has a semicircular shape having a predetermined thickness, and is alternately stacked and stored in the large-diameter portion of the bubble generating tube.
A large amount of bubbles are generated by causing water to be sucked from the water intake port by the operation of the roots pump and mixed with air taken in from the air inlet port to collide with a collision member of the bubble generation tube, and the roots It is characterized in that the bubbles are made fine by the compression action by the pump, and the water containing the refined bubbles is blown into the water from the discharge port.

同様の目的を達成するために請求項３に記載した発明は、請求項１又は２に記載の船体における微細気泡発生装置において、前記放出口に逆止弁付ノズルを設けたことを特徴とするものである。 In order to achieve the same object, the invention described in claim 3 is characterized in that in the fine bubble generating device in a hull according to claim 1 or 2, a nozzle with a check valve is provided in the discharge port. Is.

（請求項１の発明）
この船体における微細気泡発生装置は、ルーツポンプの運転により空気導入口からエジェクタ作用により取り込まれる空気が混合した水を気泡発生管の衝突部材に衝突させることにより多量の気泡を発生させ、かつ、ルーツポンプによる圧縮作用により気泡を微細化し、微細化気泡を含む水を放出口から水中に吹き込むことにより、微細気泡が含まれた水の層を船体の没水表面に厚く形成することにより船体の摩擦抵抗を減少させ、船舶の運行時の省エネルギー化に寄与する。 (Invention of Claim 1)
This device for generating fine bubbles in a hull generates a large amount of bubbles by colliding water mixed with air taken in from an air inlet through an ejector action by operation of a roots pump against a collision member of a bubble generation tube, Friction of the hull is achieved by forming a thick water layer on the submerged surface of the hull by blowing bubbles into the water from the discharge port by making the bubbles finer by the compression action of the pump Reduces resistance and contributes to energy saving during ship operation.

そして、気泡発生管の衝突部材の円形部材に、空気導入口からエジェクタ作用により取り込まれる空気が混合した水を正面から衝突させることにより、有用な微細気泡に発展する多量の気泡が発生する。A large amount of bubbles that develop into useful fine bubbles are generated by colliding, from the front, water mixed with air taken in by an ejector action from the air inlet to the circular member of the collision member of the bubble generating tube.

（請求項２の発明）(Invention of Claim 2)
この船体における微細気泡発生装置は、ルーツポンプの運転により空気導入口からエジェクタ作用により取り込まれる空気が混合した水を気泡発生管の衝突部材に衝突させることにより多量の気泡を発生させ、かつ、ルーツポンプによる圧縮作用により気泡を微細化し、微細化気泡を含む水を放出口から水中に吹き込むことにより、微細気泡が含まれた水の層を船体の没水表面に厚く形成することにより船体の摩擦抵抗を減少させ、船舶の運行時の省エネルギー化に寄与する。This device for generating fine bubbles in a hull generates a large amount of bubbles by colliding water mixed with air taken in from an air inlet through an ejector action by operation of a roots pump against a collision member of a bubble generation tube, Friction of the hull is achieved by forming a thick water layer on the submerged surface of the hull by blowing bubbles into the water from the discharge port by making the bubbles fine by the compression action of the pump and blowing the water containing the fine bubbles into the water from the discharge port. Reduces resistance and contributes to energy saving during ship operation.

気泡発生管の衝突部材は半円形状のものを互い違いに積み重ねているので、吸入される水にゴミが混入している場合に適する。Since the colliding members of the bubble generating tube are alternately stacked in a semicircular shape, it is suitable when dust is mixed in the sucked water.

（請求項３の発明）
請求項１又は請求項２の発明において、放出口に設けた逆止弁付ノズルにより、排出管（分岐管）内に気泡の一部が停滞するエアポケット状態が解消されると共に微細気泡の発生が促進される。また、ルーツポンプの運転停止時には、逆止弁付ノズルの逆止弁作用によって船舶の外の水が排出管に流入することが防止される。 (Invention of Claim 3)
In the invention of claim 1 or claim 2, the nozzle with check valve provided in the discharge port eliminates the air pocket state in which some of the bubbles are stagnating in the discharge pipe (branch pipe) and generates fine bubbles. Is promoted. Further, when the operation of the Roots pump is stopped, water outside the ship is prevented from flowing into the discharge pipe by the check valve action of the nozzle with check valve.

本発明装置を適用した船舶の外観図External view of a ship to which the device of the present invention is applied 同、船舶の要部の縦断面図Same vertical section of the ship 本発明に係る船体における微細気泡発生装置Microbubble generator in a hull according to the present invention ルーツポンプの縦断側面図Longitudinal side view of roots pump ルーツポンプの一部破断正面図Roots pump partially broken front view ３葉式ルーツポンプの要部の模式図Schematic diagram of the main parts of a three-leaf root pump 気泡発生管の説明図Illustration of bubble generation tube 気泡発生管の他の態様を示す説明図Explanatory drawing which shows the other aspect of a bubble generation pipe 逆止弁付ノズルの説明図Illustration of nozzle with check valve 本発明装置に用いるルーツポンプの特性を示すグラフThe graph which shows the characteristic of the Roots pump used for this invention apparatus

以下に、本発明の最良の形態例を図面に基づいて説明する。   The best mode of the present invention will be described below with reference to the drawings.

本発明に係る船体における微細気泡発生装置Ｂは、図１に示すタンカー等の船舶７０の船体７１の没水表面７１ｃに配置された多数の放出口７６から当該没水表面７１ｃに気泡を放出して当該船体７１の摩擦抵抗を減少させるものであり、船体７１内に当該装置Ｂに係るルーツポンプ３や各種配管を配置している（図２）。以下に、微細気泡発生装置Ｂについて詳しく説明する。   The fine bubble generating device B in the hull according to the present invention emits bubbles to the submerged surface 71c from a number of discharge ports 76 arranged on the submerged surface 71c of the hull 71 of the ship 70 such as a tanker shown in FIG. Thus, the friction resistance of the hull 71 is reduced, and the Roots pump 3 and various pipes related to the device B are arranged in the hull 71 (FIG. 2). Below, the fine bubble generator B is demonstrated in detail.

図３に示すように、船体７１内に設けられた床部材７２に微細気泡発生装置Ｂの機台１が配置され、その機台１上にルーツポンプ３と駆動モータ３８とが設置されている。
ルーツポンプ３は、図４に示すように、吸込口５と吐出口６を設けたポンプケーシング４の内部に、吸込口部８を斜め上方に、吐出口部９を斜め下方に設けたロータケーシング７が４５度傾けて配置されている。ロータケーシング７の吸込口部８の上隅部７ａとポンプケーシング４の吸込口５側の天部４ａとは、壁１０により連接されている。また、吐出口部９の下隅部７ｂから横方向へ凹円弧壁１１が一体に形成され、その凹円弧壁１１のほぼ中間部とポンプケーシング４の底部４ｂとは、縦壁１２により連接されている。１３は縦壁１２に設けられたバイパス穴である。 As shown in FIG. 3, the machine base 1 of the fine bubble generating device B is disposed on a floor member 72 provided in the hull 71, and the roots pump 3 and the drive motor 38 are installed on the machine base 1. .
As shown in FIG. 4, the Roots pump 3 is a rotor casing in which a suction port 8 is provided obliquely upward and a discharge port 9 is provided obliquely downward in a pump casing 4 provided with a suction port 5 and a discharge port 6. 7 is inclined at 45 degrees. The upper corner 7 a of the suction port 8 of the rotor casing 7 and the top 4 a on the suction port 5 side of the pump casing 4 are connected by a wall 10. Further, a concave arc wall 11 is integrally formed laterally from the lower corner portion 7b of the discharge port portion 9, and a substantially middle portion of the concave arc wall 11 and the bottom portion 4b of the pump casing 4 are connected by a vertical wall 12. Yes. Reference numeral 13 denotes a bypass hole provided in the vertical wall 12.

１４，１４はポンプケーシング４の周壁に設けられたドレン用穴、１５はポンプケーシング４の天部４ａに設けられた給水穴である。１７は一方のドレン用穴１４に螺着されたキャップ、２１は給水穴１５に螺着されたキャップである。他方のドレン用穴１４に螺着されるキャップ１８には、前記バイパス穴１３に先端部を挿入するロッド１９が中心部に突設されている。   14 and 14 are drain holes provided in the peripheral wall of the pump casing 4, and 15 is a water supply hole provided in the top portion 4 a of the pump casing 4. A cap 17 is screwed into one drain hole 14, and a cap 21 is screwed into the water supply hole 15. The cap 18 that is screwed into the other drain hole 14 is provided with a rod 19 that protrudes into the bypass hole 13 at the center.

吸込口５には、逆止弁２２を介装して配管のためのフランジ継手２３が取り付けられている。また、吐出口６にも同様に、フランジ継手２４が取り付けられている。 A flange joint 23 for piping is attached to the suction port 5 via a check valve 22. Similarly, a flange joint 24 is attached to the discharge port 6.

ロータケーシング７には、一対の２葉式ルーツロータ２６を収めている。図５に示すように、ルーツロータ２６のロータ軸２７は、ポンプケーシング４の両側に夫々固定されたハウジング３０，３１に装着したベアリング３２，３２により回転自由に支持するように設けられている。下方のロータ軸２７のハウジング３０から突出する一端にはプーリ３４を取付け、駆動モータ装置３８により伝動ベルト３９を介して該プーリ３４を回転駆動するように設けられている。ロータ軸２７の他端にはタイミングギア３５を夫々固定し、それらのタイミングギア３５，３５を噛合するように設けている。３６はハウジング３１の開口部に取り付けたギアカバーである。   The rotor casing 7 accommodates a pair of two-leaf root rotors 26. As shown in FIG. 5, the rotor shaft 27 of the Roots rotor 26 is provided so as to be freely supported by bearings 32, 32 mounted on housings 30, 31 fixed to both sides of the pump casing 4. A pulley 34 is attached to one end of the lower rotor shaft 27 protruding from the housing 30, and the pulley 34 is rotationally driven by a drive motor device 38 via a transmission belt 39. A timing gear 35 is fixed to the other end of the rotor shaft 27, and the timing gears 35 are engaged with each other. Reference numeral 36 denotes a gear cover attached to the opening of the housing 31.

ハウジング３０，３１には、ロータ軸２７を支持するベアリング３２の奥に、公知のメカニカルシールを収納したスタッフィングボックス３３が設けられている。   The housings 30 and 31 are provided with a stuffing box 33 in which a well-known mechanical seal is accommodated behind a bearing 32 that supports the rotor shaft 27.

ルーツロータ２６については、ロータ軸２７を除いて形成された芯金部２６ｂの外側にポリウレタンゴム材（又はニトリルゴム材）によりライニング加工を施している。 About the roots rotor 26, the outer side of the metal core part 26b formed except the rotor shaft | axis 27 is given the lining process with the polyurethane rubber material (or nitrile rubber material).

この実施例のルーツポンプ３では、２葉式ルーツロータ２６を採用しているが、これに限定されることなく、図６に示す３葉式ルーツロータ４１を適用することもできる。 Although the two-leaf root rotor 26 is employed in the roots pump 3 of this embodiment, the present invention is not limited to this, and a three-leaf root rotor 41 shown in FIG. 6 can also be applied.

ルーツポンプ３に接続した吸入管４５に連通する管路４５ｂには、複数の空気導入口４６を設ける。４８は空気導入口４６に接続した導入管４７に取付けられた開閉弁である。   A plurality of air inlets 46 are provided in the pipe line 45 b communicating with the suction pipe 45 connected to the roots pump 3. Reference numeral 48 denotes an on-off valve attached to an introduction pipe 47 connected to the air introduction port 46.

空気導入口４６よりもルーツポンプ３の吸入口５に近い箇所の管路４５ａには、気泡発生させるための衝突部材５０を大径部４９ａに内蔵した気泡発生管４９を介装している。図７（ｂ）に示すように、衝突部材５０は、前記大径部４９ａの内底に載せられるリング５０ａから上方へ延びる４本の脚５０ｂの上端に円形板５０ｃを一体に固定した形態とされている（請求項１の発明において採用）。 A bubble generating tube 49 in which a collision member 50 for generating bubbles is incorporated in a large diameter portion 49a is interposed in a pipe line 45a closer to the suction port 5 of the roots pump 3 than the air introduction port 46. As shown in FIG. 7B, the collision member 50 has a configuration in which a circular plate 50c is integrally fixed to the upper ends of four legs 50b extending upward from a ring 50a placed on the inner bottom of the large-diameter portion 49a. (Adopted in the invention of claim 1) .

衝突部材５０の他の態様の衝突部材５３を図８に示す。その衝突部材５３は、図８（ｂ）に示すように、所定厚さを有する半円形状とされていて、気泡発生管５２の大径部５２ａに互い違いに積み重ねて収められる。この気泡発生管５２は、吸入する水にゴミが多く混入する場合に適する構造である（請求項２の発明において採用）。 FIG. 8 shows a collision member 53 of another aspect of the collision member 50. As shown in FIG. 8B, the collision member 53 has a semicircular shape having a predetermined thickness, and is alternately stacked on the large diameter portion 52 a of the bubble generating tube 52. The bubble generating tube 52 has a structure suitable for a case where a large amount of dust is mixed in the sucked water (adopted in the invention of claim 2) .

５５は前記管路４５ｂに一端を接続し船体７１の底部７１ｂに設けられた取水口７５に他端を接続した吸い込みパイプである。吸い込みパイプ５５には、フィルタ５６と開閉弁５７が介装されている。他方、前記フランジ継手２４に一端を接続した排出管５８の他端側には、開閉弁５９とヘッダ６０を介装している。ヘッダ６０に接続された多数の分岐管６１は、船体７１の没水表面（側面）７１ｃに配置された多数の放出口７６に夫々接続するように設けられている。各分岐管６１には、開閉弁６２と逆止弁６３とが介装されている。   Reference numeral 55 denotes a suction pipe having one end connected to the pipe 45b and the other end connected to a water intake port 75 provided on the bottom 71b of the hull 71. A filter 56 and an opening / closing valve 57 are interposed in the suction pipe 55. On the other hand, an open / close valve 59 and a header 60 are interposed on the other end side of the discharge pipe 58 having one end connected to the flange joint 24. A large number of branch pipes 61 connected to the header 60 are provided so as to be connected to a large number of discharge ports 76 arranged on the submerged surface (side surface) 71c of the hull 71, respectively. Each branch pipe 61 is provided with an open / close valve 62 and a check valve 63.

これにより、ルーツポンプ３の運転により船体７１の取水口７５から水（海水、川水）を吸い込むと共に空気導入口４６からエジェクタ作用により取り込まれる空気が混合した水を衝突部材５０に衝突させることにより多量の気泡を発生させ、かつ、ルーツポンプ３による圧縮作用により気泡を微細化し、微細化された気泡が含まれた水を船体７１の放出口７６から水中に吹き込むことにより、船体の没水表面に気泡混じりの水の層を厚く形成することができる本発明に係る船体における微細気泡発生装置Ｂが構成される。   As a result, water (seawater, river water) is sucked from the water intake port 75 of the hull 71 by the operation of the roots pump 3 and the water mixed with the air taken in by the ejector action from the air introduction port 46 is caused to collide with the collision member 50. The submerged surface of the hull is generated by generating a large amount of air bubbles, miniaturizing the air bubbles by the compression action of the roots pump 3, and blowing water containing the refined air bubbles through the discharge port 76 of the hull 71. A fine bubble generating device B in a hull according to the present invention, which is capable of forming a thick water layer with bubbles, is constructed.

本発明に係る船体における微細気泡発生装置Ｂにおいては、分岐管６１内に前記気泡の一部が一時的に停滞するエアポケット状態を解消すると共に微細気泡の発生を促進するため、図９に示すように、前記放出口７６に逆止弁付ノズル６５を設けることが好ましい（請求項３の発明において採用）。 In the fine bubble generating apparatus B in the hull according to the present invention, as shown in FIG. 9, in order to eliminate the air pocket state in which a part of the bubbles temporarily stagnates in the branch pipe 61 and to promote the generation of fine bubbles. Thus, it is preferable to provide a nozzle 65 with a check valve at the discharge port 76 (adopted in the invention of claim 3) .

この逆止弁付ノズル６５は、円筒形ノズル本体６６内のほぼ中間位置に形成された壁部６６ａに弁孔６６ｂを設け、弁孔６６ｂに連通する弁室６６ｄに遊動可能に挿入されたゴム製の球状弁６７が外に飛び出さないようにストッパ６６ｅに当接可能に設けられている。６６ｃは弁孔６６ｂに形成された弁座、６６ｆはノズル本体６６の外周に形成されたネジ部である。なお、弁孔６６ｂの大きさについては、排出される水の圧力が０．３〜０．５ｋＰａを維持することができるように設けるものとする。   This nozzle 65 with a check valve is provided with a valve hole 66b in a wall portion 66a formed at a substantially intermediate position in the cylindrical nozzle body 66, and is rubber slidably inserted into a valve chamber 66d communicating with the valve hole 66b. The made spherical valve 67 is provided so as to contact the stopper 66e so as not to jump out. 66 c is a valve seat formed in the valve hole 66 b, and 66 f is a screw portion formed on the outer periphery of the nozzle body 66. In addition, about the magnitude | size of the valve hole 66b, it shall provide so that the pressure of the discharged water can maintain 0.3-0.5 kPa.

放出口７６に挿入されたノズル本体６６は、リング形パッキン６９を介在させてネジ部６６ｆに固定用リング部材６８の雌ネジ（図示せず）を螺合することにより船体７１に固定されている。固定用リング部材６８の胴部６８ａには、前記分岐管６１の先端部を接続するように設けられている。   The nozzle body 66 inserted into the discharge port 76 is fixed to the hull 71 by screwing a female screw (not shown) of the fixing ring member 68 into the screw portion 66f with a ring packing 69 interposed. . The front end of the branch pipe 61 is connected to the body 68 a of the fixing ring member 68.

しかして、逆止弁付ノズル６５では、ルーツポンプ３から排出管５８、分岐管６１を通って供給される微細化された気泡が含まれた水が、弁孔６６ｂを通過する際に流速を増加し、その流速を増加した水が弁室６６ｄ内で遊動する球状弁６７に衝突することによって気泡が再び微細化されて水中に勢いよく吹き込まれる。他方、ルーツポンプ３の運転停止時には、逆止弁付ノズル６５の逆止弁作用によって船舶７０の外の水が分岐管６１に流入することが防止される。   Therefore, in the nozzle 65 with a check valve, the flow rate of water containing fine bubbles supplied from the Roots pump 3 through the discharge pipe 58 and the branch pipe 61 passes through the valve hole 66b. The water whose flow rate has increased and collided with the spherical valve 67 floating in the valve chamber 66d is again refined and blown into the water vigorously. On the other hand, when the operation of the Roots pump 3 is stopped, the water outside the ship 70 is prevented from flowing into the branch pipe 61 by the check valve action of the nozzle 65 with a check valve.

なお、本発明に係る船体における微細気泡発生装置においては、船舶７０の喫水の深さが１５〜２５ｍという場合には、２台のルーツポンプを直列に配置するように構成するのが好ましい。   In addition, in the fine bubble generator in the hull which concerns on this invention, when the depth of the draft of the ship 70 is 15-25 m, it is preferable to comprise so that two Roots pumps may be arrange | positioned in series.

（実験１）
本発明に係る船体における微細気泡発生装置Ｂのルーツポンプに関し、吸込水量に対する吸込空気量の割合について下記条件下で清水を使用して測定した。実験結果を図１０のグラフに示す。
（実験条件）
ルーツポンプの口径：５０ｍｍ
回転速度：６３０〜７２０ｒｐｍ
モータ出力：１．５Ｋｗ
吸込圧力：−５０ｋＰａ
吐出圧力：１０ｋＰａ (Experiment 1)
Regarding the roots pump of the fine bubble generator B in the hull according to the present invention, the ratio of the intake air amount to the intake water amount was measured using fresh water under the following conditions. The experimental results are shown in the graph of FIG.
(Experimental conditions)
Roots pump diameter: 50mm
Rotation speed: 630-720rpm
Motor output: 1.5Kw
Suction pressure: -50kPa
Discharge pressure: 10kPa

実験の結果、吸込水量に対する吸込空気量の割合は、最大で３０％になり、エジェクタ作用により大量の空気が清水に混合されることが確認された。   As a result of the experiment, the ratio of the intake air amount to the intake water amount was 30% at the maximum, and it was confirmed that a large amount of air was mixed with fresh water by the ejector action.

Ｂ・・・本発明に係る船体における微細気泡発生装置
３・・・ルーツポンプ
４・・・ポンプケーシング
５・・・吸入口、６・・・吐出口
２６・・・２葉式ルーツロータ
３８・・・駆動モータ
４５・・・吸入管
４６・・・空気導入口
４９・・・気泡発生管
５０・・・衝突部材
５２・・・気泡発生管
５３・・・衝突部材
５８・・・排出管
６５・・・逆止弁付ノズル
７０・・・船舶
７１・・・船体
７１ｃ・・・没水表面
７５・・・取水口
７６・・・放出口 B ... Microbubble generator 3 in ship hull according to the present invention ... Roots pump 4 ... Pump casing 5 ... Suction port 6 ... Discharge port 26 ... Two-leaf root rotor 38・ Drive motor 45 ... Suction pipe 46 ... Air inlet
49 ... Bubble generating tube
50 ... Colliding member
52 ... Bubble generating tube
53 ... Collision member 58 ... Discharge pipe 65 ... Nozzle with check valve 70 ... Ship 71 ... Hull 71c ... Submerged surface 75 ... Water intake 76 ... Discharge port

Claims (3)

船体の没水表面に配置された多数の放出口から当該没水表面に気泡を放出して当該船体の摩擦抵抗を減少させる船体における微細気泡発生装置であって、
吸込口と吐出口を設けたポンプケーシング内に収められた一対の２葉若しくは多葉式ルーツロータを駆動モータにより回転自在に設けたルーツポンプと、その吸込口に一端を接続し前記船体に設けられた取水口に他端を接続した吸入管と、その吐出口に一端を接続し前記放出口に他端を接続した排出管とを備え、その吸入管に連通する管路に空気導入口と、吸い込んだ水を内蔵された衝突部材に衝突させる気泡発生管とを設け、
その衝突部材は、前記気泡発生管の大径部の内底に載せられるリングから上方へ延びる脚の上端に円形板を一体に固定した形態とされ、
前記ルーツポンプの運転により前記取水口から水を吸い込むと共に前記空気導入口から取り込まれる空気が混合した水を前記気泡発生管の衝突部材に衝突させることにより多量の気泡を発生させ、かつ、前記ルーツポンプによる圧縮作用により気泡を微細化し、その微細化された気泡が含まれた水を前記放出口から水中に吹き込むようにしたことを特徴とする船体における微細気泡発生装置。 A device for generating fine bubbles in a hull that reduces the frictional resistance of the hull by discharging bubbles from a number of discharge ports arranged on the submerged surface of the hull to the submerged surface,
A Roots pump in which a pair of two-leaf or multi-leaf root rotors housed in a pump casing provided with a suction port and a discharge port are rotatably provided by a drive motor, and one end connected to the suction port is provided in the hull. A suction pipe having the other end connected to the intake port, a discharge pipe having one end connected to the discharge port and the other end connected to the discharge port, and an air introduction port connected to the suction pipe; A bubble generating tube that collides the sucked water against the built-in collision member,
The collision member has a form in which a circular plate is integrally fixed to an upper end of a leg extending upward from a ring placed on the inner bottom of the large diameter portion of the bubble generating tube,
A large amount of bubbles are generated by causing water to be sucked from the water intake port by the operation of the roots pump and mixed with air taken in from the air inlet port to collide with a collision member of the bubble generation tube, and the roots An apparatus for generating fine bubbles in a hull characterized in that bubbles are made fine by a compression action by a pump, and water containing the refined bubbles is blown into the water from the discharge port. 船体の没水表面に配置された多数の放出口から当該没水表面に気泡を放出して当該船体の摩擦抵抗を減少させる船体における微細気泡発生装置であって、A device for generating fine bubbles in a hull that reduces the frictional resistance of the hull by discharging bubbles from a number of discharge ports arranged on the submerged surface of the hull to the submerged surface,
吸込口と吐出口を設けたポンプケーシング内に収められた一対の２葉若しくは多葉式ルーツロータを駆動モータにより回転自在に設けたルーツポンプと、その吸込口に一端を接続し前記船体に設けられた取水口に他端を接続した吸入管と、その吐出口に一端を接続し前記放出口に他端を接続した排出管とを備え、その吸入管に連通する管路に空気導入口と、吸い込んだ水を内蔵された衝突部材に衝突させる気泡発生管とを設け、A Roots pump in which a pair of two-leaf or multi-leaf root rotors housed in a pump casing provided with a suction port and a discharge port are rotatably provided by a drive motor, and one end connected to the suction port is provided in the hull. A suction pipe having the other end connected to the intake port, a discharge pipe having one end connected to the discharge port and the other end connected to the discharge port, and an air introduction port connected to the suction pipe; A bubble generating tube that collides the sucked water against the built-in collision member,
その衝突部材は、所定厚さを有する半円形状とされていて、前記気泡発生管の大径部に互い違いに積み重ねて収められ、The collision member has a semicircular shape having a predetermined thickness, and is alternately stacked and stored in the large-diameter portion of the bubble generating tube.
前記ルーツポンプの運転により前記取水口から水を吸い込むと共に前記空気導入口から取り込まれる空気が混合した水を前記気泡発生管の衝突部材に衝突させることにより多量の気泡を発生させ、かつ、前記ルーツポンプによる圧縮作用により気泡を微細化し、その微細化された気泡が含まれた水を前記放出口から水中に吹き込むようにしたことを特徴とする船体における微細気泡発生装置。A large amount of bubbles are generated by causing water to be sucked from the water intake port by the operation of the roots pump and mixed with air taken in from the air inlet port to collide with a collision member of the bubble generation tube, and the roots An apparatus for generating fine bubbles in a hull characterized in that bubbles are made fine by a compression action by a pump, and water containing the refined bubbles is blown into the water from the discharge port. 前記放出口に逆止弁付ノズルを設けたことを特徴とする請求項１又は２に記載の船体における微細気泡発生装置。The apparatus for generating fine bubbles in a hull according to claim 1 or 2, wherein a nozzle with a check valve is provided at the discharge port.
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