JPH09175489A - Water jet pump intake grid structure for high speed vessel - Google Patents
Water jet pump intake grid structure for high speed vesselInfo
- Publication number
- JPH09175489A JPH09175489A JP35169195A JP35169195A JPH09175489A JP H09175489 A JPH09175489 A JP H09175489A JP 35169195 A JP35169195 A JP 35169195A JP 35169195 A JP35169195 A JP 35169195A JP H09175489 A JPH09175489 A JP H09175489A
- Authority
- JP
- Japan
- Prior art keywords
- intake
- jet pump
- water jet
- grid
- grid structure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Landscapes
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、高速船の推進に用
いられるウォータージェットポンプの取水口グリッド構
造に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intake grid structure of a water jet pump used for propulsion of a high speed ship.
【０００２】[0002]
【従来の技術】一般に、推進用ウォータージェットポン
プをそなえた高速船では、図10に示すように、船体１の
船尾部において、ダクト２の前端部２ａが船底下側に配
設されて、同ダクト２の後端部２ｂ内に装備されたイン
ペラ３からなるウォータージェットポンプの作動に伴
い、ダクト前端部２ａの前方に開口した取水口４から吸
い込まれた海水が、ダクト後端のノズル５からウォータ
ージェットとして噴出され推力を発生するようになって
いる。なお、図10において符号６はインペラ３の駆動軸
を示し、符号７は海面を示している。ところで、取水口
４には、図11（図10のＦ−Ｆ矢視図）および図12（図11
のＧ−Ｇ矢視断面図）に示すような異物吸い込み防止用
グリッド（格子）８が装着されており、同グリッド８は
互いに交叉する各複数の横方向桟部材８ａおよび縦方向
桟部材８ｂで構成されている。2. Description of the Related Art Generally, in a high-speed ship equipped with a water jet pump for propulsion, as shown in FIG. 10, the front end 2a of a duct 2 is arranged below the bottom of the ship at the stern of the hull 1. With the operation of the water jet pump including the impeller 3 installed in the rear end portion 2b of the duct 2, the seawater sucked from the intake port 4 opening in front of the front end portion 2a of the duct is discharged from the nozzle 5 at the rear end of the duct. It is ejected as a water jet to generate thrust. In FIG. 10, reference numeral 6 indicates the drive shaft of the impeller 3, and reference numeral 7 indicates the sea surface. By the way, the water intake 4 has a structure shown in FIG.
A cross-sectional view taken along line G-G) of FIG. 1) is installed, and a grid (grating) 8 for preventing foreign matter suction is installed. The grid 8 is composed of a plurality of lateral beam members 8a and vertical beam members 8b intersecting each other. It is configured.
【０００３】[0003]
【発明が解決しようとする課題】前述のような従来の高
速船用ウォータージェットポンプ取水口グリッド構造で
は、グリッド８により異物の吸込みが防止されて、イン
ペラ３の損傷が防止されるものの、漁網やビニールシー
トあるいは大量の海草のごとき異物がグリッド８に引掛
かって取水作用が十分に行なわれなくなると、大幅な推
力減少を招き、ついには航行不能になる恐れがある。そ
してグリッド８に絡まった異物を取り除く作業は著しく
困難になり、航行できるように修復するためには多くの
時間を要することになる。本発明は、上述のような問題
点の解消をはかろうとするもので、ウォータージェット
ポンプ取水口のグリッドにより同取水口内への異物の侵
入を防止するとともに、同グリッドに引掛かろうとする
異物を切断して除去できるようにした高速船用ウォータ
ージェットポンプ取水口グリッド構造を提供することを
目的とする。In the conventional water jet pump intake grid structure for a high speed ship as described above, although the foreign matter is prevented from being sucked by the grid 8 and the impeller 3 is prevented from being damaged, a fishing net or vinyl is used. If a foreign matter such as a sheet or a large amount of seaweed is caught on the grid 8 and the water intake is not sufficiently performed, the thrust is significantly reduced, and there is a risk that the ship will not be able to navigate. Then, the work of removing the foreign matter entangled in the grid 8 becomes extremely difficult, and it takes a lot of time to restore the navigation device so that it can navigate. The present invention is intended to solve the above-mentioned problems, and prevents the entry of foreign matter into the water jet pump water intake port by the grid of the water jet pump water intake port, and prevents foreign matter from being caught on the grid. An object of the present invention is to provide a water jet pump intake grid structure for a high-speed ship that can be cut and removed.
【０００４】[0004]
【課題を解決するための手段】前述の目的を達成するた
め、本発明の高速船用ウォータージェットポンプ取水口
グリッド構造は、高速船の船底下側に配設されたウォー
タージェットポンプ用ダクト前端部に、前方へ向け開口
した取水口をそなえ、同取水口の開口面を覆う異物吸込
み防止用グリッドが、相互に交叉する多数の桟部材で構
成されて、同桟部材の前縁が鋭利に尖った切裂き刃を形
成されたことを特徴としている。上述のように取水口を
覆うグリッドが、同グリッドを構成する桟部材の前縁に
切裂き刃を形成されていると、高速航行時に勢いよくグ
リッドへ衝突してきた異物は、同グリッドによりダクト
内への侵入を防止されると同時に、同グリッドを構成す
る桟部材の前縁の切裂き刃で切裂かれて後方へ流れ去る
ようになる。したがって、異物が上記グリッドに引掛か
ったままで取水口を閉塞するということが無くなり、こ
れによりウォータージェットポンプの正常な作動が維持
されるようになる。In order to achieve the above-mentioned object, a water jet pump intake grid structure for a high speed ship according to the present invention is provided at a front end portion of a water jet pump duct disposed under the bottom of a high speed ship. , A foreign matter suction prevention grid that has a water intake opening that opens forward and that covers the opening surface of the water intake is composed of a number of cross members that intersect with each other, and the front edge of the cross member is sharply pointed. It is characterized by the formation of a cutting blade. As described above, if the grid covering the water intake is formed with a cutting blade at the front edge of the crosspiece member that composes the grid, foreign matter that violently collides with the grid during high-speed navigation will enter the duct by the grid. In addition to being prevented from invading, it is cut by the cutting blade at the front edge of the cross member constituting the grid and flows away backward. Therefore, it is possible to prevent the foreign matter from being caught on the grid and blocking the water intake port, thereby maintaining the normal operation of the water jet pump.
【０００５】また、本発明の高速船用ウォータージェッ
トポンプ取水口グリッド構造は、上記桟部材が横方向お
よび縦方向に配設されて、縦方向の各桟部材の前縁にお
ける上記切裂き刃の尖端に接する外接面が上記取水口の
開口面に対し傾斜するように設定されたことを特徴とし
ている。このように、グリッドを構成する縦方向の桟部
材の尖端の外接面が傾斜していると、同桟部材に衝突し
た異物が後方へ排除されやすくなり、特に上記外接面が
取水口の開口面の縦中心線に関し左右対称になるように
設定されていると、桟部材に衝突して同桟部材の前縁の
切裂き刃で切裂かれた異物は、左右に分かれて後方へ流
れやすくなる効果がある。さらに、上記取水口の開口面
が、その上辺を下辺よりも前方に配置された前傾状態に
形成されると、上記桟部材の前縁の切裂き刃で切裂かれ
た異物は、上記開口面の下方へ導かれて後方へ流れ去る
ようになる。Further, in the water jet pump intake grid structure for a high-speed ship according to the present invention, the crosspiece members are arranged in the horizontal and vertical directions, and the tip of the cutting blade at the front edge of each crosspiece member in the vertical direction. It is characterized in that the circumscribed surface in contact with is set to be inclined with respect to the opening surface of the water intake port. Thus, if the circumscribing surface of the tip end of the vertical crosspiece member forming the grid is inclined, foreign matter colliding with the crosspiece member is likely to be removed rearward, and in particular, the above circumscribing surface is the opening surface of the intake port. If it is set symmetrically with respect to the vertical center line of the, the foreign matter that collides with the crosspiece member and is torn by the cutting blade at the front edge of the crosspiece member is divided into left and right and easily flows backward. effective. Furthermore, when the opening surface of the intake port is formed in a forward tilted state in which the upper side of the opening side is arranged in front of the lower side, the foreign matter torn by the cutting blade of the front edge of the crosspiece member is It is guided below the surface and flows backward.
【０００６】また、本発明の高速船用ウォータージェッ
トポンプ取水口グリッド構造は、高速船の船底下側に配
設されたウォータージェットポンプ用ダクト前端部に、
前方へ向け開口した取水口をそなえ、同取水口の開口面
を覆う異物吸込み防止用グリッドが、上記取水口の開口
面に底面を有する錐体の錐面に沿うように配設された多
数の桟部材で構成されて、同桟部材の外縁に異物を切裂
くための切裂き刃が形成されたことを特徴としている。
上述のように、取水口を覆うグリッドが同取水口の開口
面に底面を有する錐体の錐面に沿うように配設された多
数の桟部材で構成されると、航行時に同桟部材に衝突し
た異物は上記錐体の頂部から底部周辺へ向かうように案
内され、その際、上記桟部材に設けられた切裂き刃で上
記異物が切裂かれる作用と相まって、同異物を後方へ導
いて流し去る作用が効率よく行なわれるようになり、こ
れにより、上記取水口の異物による閉塞が十分に防止さ
れるようになる。Further, the water jet pump intake grid structure for a high speed ship according to the present invention has a front end portion of a water jet pump duct disposed below the bottom of the high speed ship.
A foreign matter suction prevention grid that has a water intake opening to the front and covers the opening surface of the water intake is provided along the conical surface of a cone having a bottom surface on the opening surface of the water intake. It is characterized in that it is composed of a crosspiece member, and a cleaving blade for cutting foreign matter is formed on the outer edge of the crosspiece member.
As described above, if the grid covering the intake port is composed of a number of crosspiece members arranged along the conical surface of the cone having a bottom surface at the opening face of the intake port, the crosspiece member will be attached to the crosspiece member during navigation. The collided foreign matter is guided from the top of the cone toward the periphery of the bottom, and at that time, the foreign matter is guided backward by the action of the cutting blade provided on the crosspiece member. The action of flushing is efficiently performed, and thereby, the blockage of the water intake port by foreign matter can be sufficiently prevented.
【０００７】[0007]
【発明の実施の形態】以下、図面により本発明の実施形
態について説明すると、図１〜３は本発明の第１実施形
態としての高速船用ウォータージェットポンプ取水口グ
リッド構造を示すもので、図１は同グリッド構造をそな
えた船舶の船尾部縦断面図、図２は図１のＡ−Ａ矢視拡
大図、図３は図２のＢ−Ｂ矢視断面図である。BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. FIGS. 1 to 3 show a water jet pump intake grid structure for a high-speed ship as a first embodiment of the present invention. 2 is a vertical cross-sectional view of the stern part of the ship having the same grid structure, FIG. 2 is an enlarged view taken along the line AA of FIG. 1, and FIG. 3 is a cross-sectional view taken along the line BB of FIG.
【０００８】図１に示すように、この第１実施形態の場
合も、船体１の船尾部において、ダクト２の前端部２ａ
が船底下側に配設されて、同ダクト２の後端部２ｂ内に
装備されたインペラ３からなるウォータージェットポン
プの作動に伴い、ダクト前端部２ａの前方に開口した取
水口４から吸い込まれた海水が、ダクト後端のノズル５
からウォータージェットとして噴出され推力を発生する
ようになっている。そして取水口４の方形の開口面は、
その上辺ａを下辺ｂよりも前方に配置されて、傾斜角α
（45度程度）を有する前傾状態に形成されている。As shown in FIG. 1, also in the case of the first embodiment, the front end portion 2a of the duct 2 is formed at the stern portion of the hull 1.
Is disposed on the lower side of the bottom of the ship and is sucked from the intake port 4 opened in front of the front end 2a of the duct along with the operation of the water jet pump including the impeller 3 installed in the rear end 2b of the duct 2. The seawater is the nozzle 5 at the rear end of the duct.
It is ejected as a water jet from and generates thrust. And the square opening surface of the intake port 4 is
The upper side a is arranged in front of the lower side b, and the inclination angle α
It is formed in a forward tilted state (about 45 degrees).
【０００９】取水口４には、図２，３に示すようにその
開口面を覆う異物吸込み防止用グリッド８が設けられて
おり、同グリッド８は相互に交叉する多数の横方向の桟
部材８ａおよび縦方向の桟部材８ｂで構成されている。
本実施形態では特に、縦方向の桟部材８ｂの前縁が鋭利
に尖った切裂き刃８ｄを形成されていて、縦方向の各桟
部材８ｂの前縁における切裂き刃８ｄの外接面８ｅが、
取水口４の開口面に対し傾斜角β（15度程度）を有する
ように設定されている。なお、図１における符号６はイ
ンペラ３の駆動軸を示し、符号７は海面を示している。As shown in FIGS. 2 and 3, the water intake port 4 is provided with a foreign matter suction prevention grid 8 that covers the opening surface thereof, and the grid 8 is provided with a large number of lateral crosspiece members 8a that intersect with each other. And a vertical crosspiece member 8b.
In the present embodiment, in particular, the front edge of the vertical crosspiece member 8b is formed with a sharply cutting edge 8d, and the circumscribing surface 8e of the cutting edge 8d at the front edge of each vertical crosspiece member 8b is formed. ,
It is set to have an inclination angle β (about 15 degrees) with respect to the opening surface of the water intake 4. It should be noted that reference numeral 6 in FIG. 1 indicates the drive shaft of the impeller 3, and reference numeral 7 indicates the sea surface.
【００１０】上述の本発明の第１実施形態では、グリッ
ド８を構成する縦方向の桟部材８ｂの前縁に切裂き刃８
ｄが形成されているので、高速航行時に勢いよくグリッ
ド８へ衝突してきた異物は、同グリッド８によりダクト
２内への侵入を防止されると同時に、同グリッド８を構
成する桟部材８ｂの前縁の切裂き刃８ｄで切裂かれて後
方へ流れ去るようになる。したがって、異物がグリッド
８に引掛かったままで取水口４を閉塞するということが
無くなり、これによりよりインペラ３を含むウォーター
ジェットポンプの正常な作動が維持されるようになる。
なお、船速40ノット（時速74km）の場合、異物がグリッ
ド８に衝突する速度は約20m／secという極めて高い値に
なり、切裂き刃８ｄの存在により異物は容易に切断され
るようになる。In the above-described first embodiment of the present invention, the cutting blade 8 is provided at the front edge of the vertical crosspiece member 8b forming the grid 8.
Since the d is formed, foreign matter that has violently collided against the grid 8 during high-speed navigation is prevented from entering the duct 2 by the grid 8 and at the same time, in front of the crosspiece member 8b forming the grid 8. It is torn by the edge tearing blade 8d and flows backward. Therefore, it is possible to prevent the foreign matter from being caught in the grid 8 and block the water intake port 4, and thus the normal operation of the water jet pump including the impeller 3 can be maintained.
In addition, when the ship speed is 40 knots (74 km / h), the speed at which the foreign matter collides with the grid 8 is an extremely high value of about 20 m / sec, and the foreign matter is easily cut due to the presence of the cutting blade 8d. .
【００１１】また、グリッド８を構成する縦方向の桟部
材８ｂの尖端の外接面８ｅが開口面に対し角度βだけ傾
斜しているので、同桟部材８ｂに衝突した異物が後方へ
排除されやすくなり、特に外接面８ｅが取水口４の開口
面の縦中心線に関し左右対称になるように設定されてい
るため、桟部材８ｂに衝突して同桟部材８ｂの前縁の切
裂き刃８ｄで切裂かれた異物は左右に分かれて後方へ流
れやすくなる効果がある。さらに、取水口４の開口面
が、その上辺を下辺よりも前方に配置された前傾状態に
形成されるので、桟部材８ｂの前縁の切裂き刃８ｄで引
裂かれた異物は、開口面の下方へ導かれて後方へ流れ去
るようになる。Further, since the circumscribing surface 8e at the apex of the vertical rail member 8b forming the grid 8 is inclined by the angle β with respect to the opening surface, foreign matter colliding with the rail member 8b is easily removed rearward. In particular, since the circumscribing surface 8e is set to be bilaterally symmetrical with respect to the vertical center line of the opening surface of the intake port 4, the circumscribing surface 8e collides with the crosspiece member 8b, and the cutting blade 8d at the front edge of the crosspiece member 8b is used. The dissected foreign matter is divided into left and right parts, which makes it easier to flow backward. Further, since the opening surface of the water intake port 4 is formed such that the upper side thereof is arranged forward of the lower side, the foreign matter torn by the cutting blade 8d at the front edge of the crosspiece member 8b is not opened. It will be guided downwards and will flow away backwards.
【００１２】なお、前述の各傾斜角α，βについては、
強度および効果からみて、αを30〜60度、βを10〜60度
とすることが望ましい。また、上述の第１実施形態で
は、縦方向の桟部材８ｂにおける切裂き刃８ｄの尖端の
外接面８ｅが取水口４の開口面の縦中心線に関し左右対
称になるように設定されているが、ウォータージェット
ポンプ式推進装置が船尾に２基並設される場合は、左右
舷の各取水口のグリッドにおける外接面８ｅが船体中心
線に関し対称になっていればよいので、例えば図４に示
すように各ダクト前端部２ａの取水口自体については左
右対称でなくてもよく、さらに、この外接面８ｅについ
て図５(a)〜(e)に示すような種々の形状の設定が可能で
ある。Regarding the aforementioned inclination angles α and β,
From the viewpoint of strength and effect, it is desirable that α is 30 to 60 degrees and β is 10 to 60 degrees. Further, in the above-described first embodiment, the circumscribing surface 8e at the tip of the cutting blade 8d in the vertical cross-piece member 8b is set to be bilaterally symmetrical with respect to the vertical center line of the opening surface of the water intake 4. When two water jet pump type propulsion devices are installed side by side at the stern side, the circumscribing surface 8e in the grid of each intake port on the left and right sides may be symmetrical with respect to the center line of the hull. As described above, the water intakes of the front ends 2a of the respective ducts do not have to be bilaterally symmetrical, and further, the external contact surface 8e can be set in various shapes as shown in FIGS. 5 (a) to 5 (e). .
【００１３】次に本発明の第２実施形態としての高速船
用ウォータージェットポンプ取水口グリッド構造につい
て説明すると、図６は同グリッド構造をそなえた船舶の
船尾部縦断面図、図７は図６のＣ部を拡大して示す斜視
図、図８は図７のＤ部拡大斜視図、図９は図７のＥ−Ｅ
矢視拡大断面図である。Next, a description will be given of a water jet pump intake grid structure for a high speed ship according to a second embodiment of the present invention. FIG. 6 is a longitudinal sectional view of a stern part of a ship having the grid structure, and FIG. FIG. 8 is an enlarged perspective view of the C portion, FIG. 8 is an enlarged perspective view of the D portion of FIG. 7, and FIG.
FIG.
【００１４】図６に示すように、この第２実施形態の場
合も、船体１の船尾部において、ダクト２の前端部２ａ
が船底下側に配設されて、同ダクト２の後端部２ｂ内に
装備されたインペラ３からなるウォータージェットポン
プの作動に伴い、ダクト前端部２ａの前方に開口した取
水口４から吸い込まれた海水が、ダクト後端のノズル５
からウォータージェットとして噴出され推力を発生する
ようになっている。なお図６において符号６はインペラ
３の駆動軸を示し、符号７は海面を示している。As shown in FIG. 6, also in the case of the second embodiment, the front end portion 2a of the duct 2 is formed at the stern portion of the hull 1.
Is disposed on the lower side of the bottom of the ship and is sucked from the intake port 4 opened in front of the front end 2a of the duct along with the operation of the water jet pump including the impeller 3 installed in the rear end 2b of the duct 2. The seawater is the nozzle 5 at the rear end of the duct.
It is ejected as a water jet from and generates thrust. In FIG. 6, reference numeral 6 indicates the drive shaft of the impeller 3, and reference numeral 7 indicates the sea surface.
【００１５】取水口４には、図６，７に示すように、そ
の方形の開口面に底面を有するようにして同開口面を覆
う全体として四角錐状の異物吸込み防止用グリッド８
が、フレーム９を介して設けられており、同グリッド８
は相互に交叉する多数の横方向の桟部材８ａ，縦方向の
桟部材８ｂおよび傾斜方向の桟部材８ｃで構成されてい
る。すなわち、各桟部材８ａ，８ｂ，８ｃは、四角錐体
の錐面に沿うように配設されている。また各桟部材８
ａ，８ｂ，８ｃには、図８および図９に示すように各外
縁に異物を切裂くための切裂き刃８ｄが形成されてい
る。As shown in FIGS. 6 and 7, the water intake port 4 has a rectangular opening surface having a bottom surface to cover the opening surface.
Is provided through the frame 9 and the grid 8
Is composed of a large number of horizontal crosspiece members 8a, vertical crosspiece members 8b, and inclined crosspiece members 8c. That is, the crosspiece members 8a, 8b, 8c are arranged along the conical surface of the quadrangular pyramid. In addition, each cross member 8
As shown in FIGS. 8 and 9, each of a, 8b, and 8c is provided with a cutting blade 8d for cutting a foreign substance at each outer edge.
【００１６】上述のように構成された本発明の第２実施
形態では、取水口４を覆うグリッド８が同取水口４の開
口面に底面を有する錐体の錐面に沿うように配設された
多数の桟部材８ａ，８ｂ，８ｃで構成されるので、航行
時に同桟部材８ａ，８ｂ，８ｃに衝突した異物は上記錐
体の頂部から底部周辺へ向かうように案内され、その
際、各桟部材８ａ，８ｂ，８ｃに設けられた切裂き刃８
ｄで上記異物が引裂かれる作用と相まって、同異物を後
方へ導いて流し去る作用が効率よく行なわれるようにな
り、これにより、取水口４の異物による閉塞が十分に防
止されるようになる。なお、上述の第２実施形態では、
グリッド８が全体として四角錐状に構成されているが、
取水口４が円形の場合は、グリッド８は傾斜方向の桟部
材と横断面に沿う大中小の円形桟部材とにより全体とし
て円錐形状に形成される。In the second embodiment of the present invention configured as described above, the grid 8 covering the water intake port 4 is arranged along the conical surface of the cone having the bottom surface at the opening surface of the water intake port 4. Since it is composed of a large number of crosspiece members 8a, 8b, 8c, foreign matter that collides with the crosspiece members 8a, 8b, 8c during navigation is guided from the top of the cone to the periphery of the bottom, and at that time, Cutting blade 8 provided on crosspiece members 8a, 8b, 8c
Coupled with the action of tearing the foreign substance at d, the action of guiding the foreign substance backward and flowing out can be efficiently performed, whereby the intake port 4 can be sufficiently prevented from being blocked by the foreign substance. In the second embodiment described above,
The grid 8 is formed into a pyramid shape as a whole,
When the water intake 4 is circular, the grid 8 is formed in a conical shape as a whole by the cross-shaped members in the inclined direction and the large, medium and small circular cross-shaped members along the cross section.
【００１７】[0017]
【発明の効果】以上詳述したように、本発明の高速船用
ウォータージェットポンプ取水口グリッド構造によれば
次のような効果が得られる。 (1) 取水口を覆うグリッドが、同グリッドを構成する桟
部材の前縁に鋭利に尖った切裂き刃を形成されているの
で、高速航行時に勢いよくグリッドへ衝突してきた異物
は、同グリッドによりダクト内への侵入を防止されると
同時に、同グリッドを構成する桟部材の前縁の切裂き刃
で切裂かれて後方へ流れ去るようになる。 (2) 上記(1)項により、異物が上記グリッドに引掛かっ
たままで取水口を閉塞するということが無くなり、これ
によりウォータージェットポンプの正常な作動が維持さ
れるようになる。 (3) 上記グリッドを構成する縦方向の桟部材の尖端の外
接面が傾斜していると、同桟部材に衝突した異物が後方
へ排除されやすくなり、特に上記外接面が取水口の開口
面の縦中心線に関し左右対称になるように設定されてい
ると、桟部材に衝突して同桟部材の前縁の切裂き刃で切
裂かれた異物は、左右に分かれて後方へ流れやすくなる
効果がある。 (4) 上記取水口の開口面が、その上辺を下辺よりも前方
に配置された前傾状態に形成されると、上記桟部材の前
縁の切裂き刃で切裂かれた異物は、上記開口面の下方へ
導かれて後方へ流れ去るようになる。 (5) 上記取水口を覆うグリッドが同取水口の開口面に底
面を有する錐体の錐面に沿うように配設された多数の桟
部材で構成されると、航行時に同桟部材に衝突した異物
は上記錐体の頂部から底部周辺へ向かうように案内さ
れ、その際、上記桟部材に設けられた切裂き刃で上記異
物が切裂かれる作用と相まって、同異物を後方へ導いて
流し去る作用が効率よく行なわれるようになり、これに
より、上記取水口の異物による閉塞が十分に防止される
ようになる。As described above in detail, according to the water jet pump intake grid structure for a high speed ship of the present invention, the following effects can be obtained. (1) Since the grid covering the intake is formed with a sharp cutting blade at the front edge of the crosspieces that compose the grid, foreign matter that violently collides with the grid during high-speed navigation is With this, the invasion into the duct is prevented, and at the same time, it is torn by the tearing blade at the front edge of the cross member forming the grid and flows backward. (2) According to the above item (1), it is possible to prevent foreign matter from blocking the water intake port while being caught by the grid, thereby maintaining normal operation of the water jet pump. (3) If the circumscribing surface at the tip of the vertical crosspiece member that constitutes the grid is inclined, foreign matter that collides with the crosspiece member is likely to be removed rearward, and in particular, the above circumscribed surface is the opening surface of the intake port. If it is set symmetrically with respect to the vertical center line of the, the foreign matter that collides with the crosspiece member and is torn by the cutting blade at the front edge of the crosspiece member is divided into left and right, and easily flows backward. effective. (4) When the opening surface of the water intake port is formed in a forward tilted state in which the upper side of the opening side is arranged in front of the lower side, the foreign matter torn by the cutting edge of the front edge of the crosspiece member is It is guided below the opening surface and flows backward. (5) If the grid covering the intake is composed of a number of crosspieces arranged along the conical surface of a cone having a bottom surface at the opening of the intake, it will collide with the crosspiece during navigation. The foreign matter is guided from the top of the cone toward the periphery of the bottom, and at that time, the foreign matter is guided by the tearing blade provided on the crosspiece member so that the foreign matter is guided backward. The leaving action can be efficiently performed, whereby the intake port can be sufficiently prevented from being blocked by foreign matter.
【図１】本発明の第１実施形態としての高速船用ウォー
タージェットポンプ取水口グリッド構造をそなえた船舶
の船尾部縦断面図である。FIG. 1 is a vertical cross-sectional view of a stern of a ship equipped with a water jet pump intake grid structure for a high-speed ship as a first embodiment of the present invention.
【図２】図１のＡ−Ａ矢視拡大図である。FIG. 2 is an enlarged view taken along the line AA of FIG. 1;
【図３】図２のＢ−Ｂ矢視断面図である。FIG. 3 is a sectional view taken along the line BB of FIG. 2;
【図４】図３における外接面の変形例を示す断面図であ
る。FIG. 4 is a cross-sectional view showing a modified example of the circumscribing surface in FIG.
【図５】(a)〜(e)図は図３における外接面の変形例とし
ての各種形状を示す概略図である。5A to 5E are schematic views showing various shapes as modified examples of the circumscribing surface in FIG.
【図６】本発明の第２実施形態としての高速船用ウォー
タージェットポンプ取水口グリッド構造をそなえた船舶
の船尾部縦断面図である。FIG. 6 is a vertical cross-sectional view of the stern of a ship equipped with a water jet pump intake grid structure for a high-speed ship as a second embodiment of the present invention.
【図７】図６のＣ部を拡大して示す斜視図である。FIG. 7 is a perspective view showing an enlarged part C of FIG.
【図８】図７のＤ部を拡大して示す斜視図である。FIG. 8 is an enlarged perspective view showing a portion D of FIG.
【図９】図７のＥ−Ｅ断面を拡大して示す断面図であ
る。9 is a cross-sectional view showing an enlarged EE cross section of FIG. 7. FIG.
【図10】従来の高速船用ウォータージェットポンプ取水
口グリッド構造をそなえた船舶の船尾部縦断面図であ
る。FIG. 10 is a vertical cross-sectional view of the stern part of a ship provided with a conventional water jet pump intake grid structure for a high-speed ship.
【図11】図10のＦ−Ｆ矢視拡大図である。11 is an enlarged view taken along the line FF of FIG.
【図12】図11のＧ−Ｇ矢視断面図である。12 is a cross-sectional view taken along the line GG of FIG.
１ 船体 ２ ダクト ２ａ ダクト前端部 ２ｂ ダクト後端部 ３ インペラ ４ 取水口 ５ ノズル ６ 駆動軸 ７ 海面 ８ 異物吸込み防止用グリッド ８ａ，８ｂ，８ｃ 桟部材 ８ｄ 切裂き刃 ８ｅ 外接面 ９ フレーム 1 Hull 2 Duct 2a Duct front end 2b Duct rear end 3 Impeller 4 Intake port 5 Nozzle 6 Drive shaft 7 Sea surface 8 Foreign matter suction prevention grid 8a, 8b, 8c Cross member 8d Cutting blade 8e Outer surface 9 Frame
Claims (5)
ージェットポンプ用ダクト前端部に、前方へ向け開口し
た取水口をそなえ、同取水口の開口面を覆う異物吸込み
防止用グリッドが、相互に交叉する多数の桟部材で構成
されて、同桟部材の前縁が鋭利に尖った切裂き刃を形成
されたことを特徴とする、高速船用ウォータージェット
ポンプ取水口グリッド構造。1. A grid for preventing foreign matter suction, comprising a front end portion of a duct for a water jet pump arranged below the bottom of a high-speed ship, having a water intake opening forward, and covering an opening surface of the water intake opening. A water jet pump intake grid structure for a high-speed ship, comprising a plurality of crosspieces that intersect with each other, and a front edge of the crosspiece is formed with a sharply pointed cutting blade.
ェットポンプ取水口グリッド構造において、上記桟部材
が横方向および縦方向に配設されて、縦方向の各桟部材
の前縁における上記切裂き刃の尖端に接する外接面が上
記取水口の開口面に対し傾斜するように設定されたこと
を特徴とする、高速船用ウォータージェットポンプ取水
口グリッド構造。2. The water jet pump intake grid structure for a high-speed ship according to claim 1, wherein the crosspiece members are arranged in a horizontal direction and a vertical direction, and the tearing is provided at a front edge of each crosspiece member in the vertical direction. A water jet pump intake grid structure for a high-speed ship, characterized in that the circumscribing surface in contact with the tip of the blade is set to be inclined with respect to the opening surface of the intake.
ェットポンプ取水口グリッド構造において、上記外接面
が、上記取水口の開口面の縦中心線に関し左右対称に設
定されたことを特徴とする、高速船用ウォータージェッ
トポンプ取水口グリッド構造。3. The water jet pump intake grid structure for a high-speed ship according to claim 2, wherein the circumscribing surface is set symmetrically with respect to a longitudinal centerline of the opening surface of the intake. Water jet pump intake grid structure for high speed ships.
速船用ウォータージェットポンプ取水口グリッド構造に
おいて、上記取水口の開口面が、その上辺を下辺よりも
前方に配置された前傾状態に形成されたことを特徴とす
る、高速船用ウォータージェットポンプ取水口グリッド
構造。4. The water jet pump intake grid structure for a high-speed ship according to claim 1, wherein an opening face of the intake port is inclined forward with its upper side arranged in front of the lower side. Water jet pump intake grid structure for high-speed ships, characterized by being formed in a state.
ージェットポンプ用ダクト前端部に、前方へ向け開口し
た取水口をそなえ、同取水口の開口面を覆う異物吸込み
防止用グリッドが、上記取水口の開口面に底面を有する
錐体の錐面に沿うように配設された多数の桟部材で構成
されて、同桟部材の外縁に異物を切裂くための切裂き刃
が形成されたことを特徴とする、高速船用ウォータージ
ェットポンプ取水口グリッド構造。5. A foreign matter suction prevention grid is provided at a front end of a duct for a water jet pump arranged below the bottom of a high-speed ship, with a water intake opening forward, and a foreign matter suction prevention grid covering the opening surface of the water intake. It is composed of a number of crosspiece members arranged along the conical surface of a cone having a bottom surface on the opening surface of the water intake, and a cutting blade for cutting foreign matter is formed on the outer edge of the crosspiece member. A water jet pump intake grid structure for high-speed vessels.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35169195A JPH09175489A (en) | 1995-12-26 | 1995-12-26 | Water jet pump intake grid structure for high speed vessel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35169195A JPH09175489A (en) | 1995-12-26 | 1995-12-26 | Water jet pump intake grid structure for high speed vessel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09175489A true JPH09175489A (en) | 1997-07-08 |
Family
ID=18418975
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP35169195A Withdrawn JPH09175489A (en) | 1995-12-26 | 1995-12-26 | Water jet pump intake grid structure for high speed vessel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09175489A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108791790A (en) * | 2018-06-29 | 2018-11-13 | 珠海云洲智能科技有限公司 | Trash rack and its spray pump and ship |
| CN109305291A (en) * | 2018-09-21 | 2019-02-05 | 天长市蓝天船舶设备制造有限公司 | A kind of hull bottom arthropod type suction grid |
| CN114212185A (en) * | 2021-12-15 | 2022-03-22 | 中船广西船舶及海洋工程有限公司 | Thick steel plate type ship stem |
-
1995
- 1995-12-26 JP JP35169195A patent/JPH09175489A/en not_active Withdrawn
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108791790A (en) * | 2018-06-29 | 2018-11-13 | 珠海云洲智能科技有限公司 | Trash rack and its spray pump and ship |
| CN108791790B (en) * | 2018-06-29 | 2020-05-15 | 珠海云洲智能科技有限公司 | Water inlet grille, spraying pump of water inlet grille and ship |
| CN109305291A (en) * | 2018-09-21 | 2019-02-05 | 天长市蓝天船舶设备制造有限公司 | A kind of hull bottom arthropod type suction grid |
| CN109305291B (en) * | 2018-09-21 | 2019-10-22 | 天长市蓝天船舶设备制造有限公司 | A kind of hull bottom arthropod type suction grid |
| CN114212185A (en) * | 2021-12-15 | 2022-03-22 | 中船广西船舶及海洋工程有限公司 | Thick steel plate type ship stem |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR20190083606A (en) | Marine propulsion system | |
| CA2295806C (en) | Water jet propulsion type outboard motor | |
| JPH09156591A (en) | Weed lattice of jet driving device for ship | |
| JPH09175489A (en) | Water jet pump intake grid structure for high speed vessel | |
| US8007329B2 (en) | Cutting system for fouling removal from jet drive water intake | |
| US5468165A (en) | Grass and debris exclusion plate for marine jet pumps | |
| US6629866B2 (en) | Marine vehicle propulsion system | |
| US5779508A (en) | Anticlogging water jet craft | |
| EP0249321A2 (en) | Boat hull | |
| JP2883562B2 (en) | Resistance control device for personal watercraft | |
| US20060254493A1 (en) | Tri-point hydro sled | |
| JP3269074B2 (en) | Device for preventing blockage of pump for jet generation in water jet propulsion ship | |
| JP3331587B2 (en) | Water jet propulsion fireboat mud suction prevention device | |
| JP3799436B2 (en) | Marine attached organism removal apparatus and removal method | |
| JPH0487898A (en) | Obstruction suction preventing device in jet propulsion system gliding boat | |
| JP3387699B2 (en) | Acid treatment equipment for seaweed aquaculture work boats | |
| JP3331590B2 (en) | Inlet dust crusher for water jet propulsion ship | |
| CN215012755U (en) | Oxygen-increasing machine impeller and oxygen-increasing machine | |
| JPH08127392A (en) | Intake bar structure in water jet | |
| RU2176608C2 (en) | High-speed vessel | |
| JP3299664B2 (en) | Nori culture work boat | |
| US6234104B1 (en) | Hull for a shallow water fishing boat | |
| EP0201657B1 (en) | A watercraft fitted with water-jet propulsion units, and a water-jet propulsion unit for watercraft | |
| JPH0717675Y2 (en) | Side-slip prevention device for jet-propelled planing boat | |
| JPS6116678B2 (en) |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20030304 |