SE449463B

SE449463B - Water jet unit for ship

Info

Publication number: SE449463B
Application number: SE8106979A
Authority: SE
Inventors: K Haglund
Original assignee: Kamewa Ab
Priority date: 1981-11-24
Filing date: 1981-11-24
Publication date: 1987-05-04
Also published as: SE8106979L

Abstract

The water et unt comprises a propeller pump having a pump housing connected on ts inlet side with an inlet channel and on its outlet side with a water jet directing outlet. The pump housing has a hub housing which is arranged centrally in the flow path of the water through the pump housing and which is carried by guide vanes extending radially between the wall of the pump housing and the hub housing. An impeller is mounted on the end of a pump shaft extendng into the pump housing through the inlet channel, and is journalled in the hub housing by an axial bearing and a radial bearing. Both bearings are spherical and have a common centre of curvature.

Description

15 20 25 30 35 449 463 ; 2 I det följande skall uppfinningen närmare beskrivasi.anshﬂr ning till bifogad ritningi i vilken Pig. la, lbodilcgﬂacaæﬂep sida vid sida visar en sidovy i axiellt snitt av ensåsmnexamæl visad utföringsform av ett stråldriftsaggregatenlügïmqﬁﬁnmügen. 15 20 25 30 35 449 463; In the following, the invention will be described in more detail with reference to the accompanying drawing in which Figs. la, lbodilcg ﬂ acaæ ﬂ ep side by side shows a side view in axial section of ensåsmnexamæl shown embodiment of a beam drive aggregatenlügïmq ﬁﬁ nmügen.

Stråldriftsaggregatet är visat monterat i aktern av ett fartyg, varav endast akterstäven l och bottnen 2 är schematiskt antydda medelst punktstreckade linjer. Strål- driftsaggregatet innefattar en inloppskanal 3, som sträcker sig från ett vattenintag H i fartygets botten till fartygets akterstäv l, där inloppskanalen är ansluten till en monte- ríngsfläns 5 för aggregatets pumphus 6. Intaget U är försett med ett galler 7, som hindrar föremål från att sugas in i stråldriftsaggregatet och skada detsamma.The jet propulsion unit is shown mounted in the stern of a ship, of which only the stern 1 and the bottom 2 are schematically indicated by dotted lines. The jet operating unit comprises an inlet duct 3, which extends from a water inlet H in the bottom of the ship to the stern 1 of the ship, where the inlet duct is connected to a mounting flange 5 for the pump housing 6 of the unit. The inlet U is provided with a grid 7, which prevents objects from being sucked into the radiator and damaging it.

Pumpen utgöres av en propellerpump, som har ett cent- ralt i strömningsvägen genom pumphuset 6 anordnat nav- eller lagerhus 8, som uppbäres av ledskovlar 9, som sträcker sig mellan insidan av pumphusets 6 vägg och utsidan av navhuset 8. I navhuset 8 är det på änden av en pumpaxel 10 monterade pumphjulet ll lagrt. Pumpaxeln 10 skjuter in i pumphuset 6 genom inloppskanalen 3 och är omgiven av en hylsa 12 för minskning av den roterande pumpaxelns 10 inverkan på vatten- strömningen genom inloppskanalen 3. Utanför inloppskanalen 3 är pumpaxeln 10 tätad medelst en tätning 13, vars tätnings- hus är anslutet till axelhylsan 12 medelst en flexibel hylsa l2a,varigenom kraven på inloppskanalens 3 tillverkningsnog- grannhet minskas. Inuti fartyget är pumpaxeln l0 kopplad till ett ej närmare visat drivmaskineri.The pump consists of a propeller pump, which has a hub or bearing housing 8 arranged centrally in the flow path through the pump housing 6, which is supported by guide vanes 9, which extend between the inside of the wall of the pump housing 6 and the outside of the hub housing 8. In the hub housing 8 it is mounted on the end of a pump shaft 10 the impeller 11 is mounted. The pump shaft 10 projects into the pump housing 6 through the inlet channel 3 and is surrounded by a sleeve 12 for reducing the effect of the rotating pump shaft 10 on the water flow through the inlet channel 3. Outside the inlet channel 3 the pump shaft 10 is sealed by a seal 13, whose sealing housing is connected to the shaft sleeve 12 by means of a flexible sleeve 12a, whereby the requirements for the manufacturing accuracy of the inlet duct 3 are reduced. Inside the ship, the pump shaft 10 is connected to a drive machinery, not shown in more detail.

På sin utloppssida är pumphuset 6 anslutet till ett utloppsrör 15, i vilket ett strålmunstycke 16 för riktning av vattenstrålen är monterat. För styrning av fartyget är strålmunstycket 16 svängbart i sidled omkring vertikala svängtappar l7 medelst i ritningen ej närmare visade-hydraul- motorer. För reversering av aggregatets kraftriktning för bromsning eller backning av fartyget kan en skopa 18 svängas från ett helt utanför munstycket 16 beläget, ínaktiyt läge, i vilket-hela vattenstrålen från aggregatet är riktad rakt bakåt för full drift framåt, gradvis in i strålmunstycket 16 till ett helt insvängt, maximalt aktivt läge, i vilket hela om 15 20 25 '30 35 449 463 3 vattenstrålen avlänkas medelst skópan 18 i riktning snett nedåt-framåt för full drift bakåt. Genom inställning av skopan 18 i mellanlägen mellan de båda nämnda ytterlägena kan en önskad del av vattenstrålen avlänkas, så att önskad drivkraft fram respektive back erhålles.On its outlet side, the pump housing 6 is connected to an outlet pipe 15, in which a jet nozzle 16 for directing the water jet is mounted. For steering the vessel, the jet nozzle 16 is pivotable laterally about vertical pivots 17 by means of hydraulic motors not shown in more detail in the drawing. To reverse the direction of force of the unit for braking or reversing the vessel, a bucket 18 can be pivoted from a position located completely outside the nozzle 16, in an inactive position, in which the entire water jet from the unit is directed straight backwards for full forward operation, gradually into the jet nozzle 16 to a fully swung in, maximum active position, in which the entire water jet is deflected by means of the bucket 18 in the direction obliquely downwards-forwards for full operation backwards. By adjusting the bucket 18 in intermediate positions between the two mentioned extreme positions, a desired part of the water jet can be deflected, so that the desired driving force forward and reverse, respectively, is obtained.

Pumphjulet ll innefattar ett skålformat, i riktning mot navhuset 8 konkavt nav lla, vilket på sin utsida uppbär pumpskovlarna llb. Hjulnavet lla är monterat på en hylsa l9, som är monterad medelst splines på pumpaxelnstlﬁ ände och lagrad i navhuset 8 medelst ett radiallager 20 och ett axial- lager 21. Såväl radiallagret 20 som axiallagret 21 är sfäriska och så utformade och anordnade, att de har ett i huvudsak gemensamt sfäriskt centrum. Härigenom kommer lagren att vara väsentligen opåverkade av eventuella avvikelser hos pumpaxelns 10 inriktning relativt den teoretiskt korrekta inriktningen. Sådana avvikelser kan mycket lätt uppstå som följd av onoggrannheter vid tillverkningen av fartygets skrov och monteringen av stråldriftsaggregatet och dess driv- maskin i fartyget och kan även uppstå under drift som följd av rörelser i fartygsskrovet och rörelser hos drivmaskinen, som i många fall är fjädrande monterad i fartyget.The impeller 11 comprises a cup-shaped, concave hub 11a in the direction of the hub housing 8, which on its outside supports the impellers 11b. The wheel hub 11a is mounted on a sleeve 19, which is mounted by means of splines on the pump shaft end and mounted in the hub housing 8 by means of a radial bearing 20 and an axial bearing 21. Both the radial bearing 20 and the axial bearing 21 are spherical and so designed and arranged that they have a substantially common spherical center. As a result, the bearings will be substantially unaffected by any deviations of the direction of the pump shaft 10 relative to the theoretically correct direction. Such deviations can very easily occur due to inaccuracies in the manufacture of the ship's hull and the mounting of the jet propulsion unit and its propulsion in the vessel and can also occur during operation due to movements in the hull and movements of the propulsion, which in many cases are resiliently mounted in the ship.

För reducering av den axiella belastningen på pump- hjulet ll är hjulnavet lla utmed sin yttre omkrets försett med en Labyrinttätning 22 relativt navhuset 8, så att det mellan navhuset och hjulnavet lla föreligger ett utrymme 23, som står i förbindelse med pumphjulets ll sugsida genom öppningar QH i hjulnavct i närheten av pumpaxeln.To reduce the axial load on the impeller 11, the wheel hub 11a is provided along its outer circumference with a labyrinth seal 22 relative to the hub housing 8, so that between the hub housing and the wheel hub 11a there is a space 23 which communicates with the suction side of the impeller 11 through openings. QH in wheel hub near the pump shaft.

Navhusets 8 inre är fyllt med smörjolja, som står under statiskt övertryck från en högre belägen oljetank. För en effektiv kylning av oljan i navhuset 8 hålles dljan i cirku- ' lation, genom att pumpaxelns l0.ände är försedd med en urborr- ning 25, som via hål 26 står i förbindelse med ett ringformat utrymme 27 mellan axelns 10 utsida och hylsans l9 insida, vilket utrymme 27 i sin tur genom hål 28 i hylsans 19 vägg står i förbindelse med axiallagrets 21 insida. Genom axial- lagrets 2l medverkan vid pumphjulets ll rotation cirkuleras oljan inuti navhuset 8, såsom markerat medelst pilar 29.The interior of the hub housing 8 is filled with lubricating oil, which is under static overpressure from a higher oil tank. For an efficient cooling of the oil in the hub housing 8, the part is kept in circulation, in that the end of the pump shaft 10 is provided with a bore 25, which via hole 26 communicates with an annular space 27 between the outside of the shaft 10 and the sleeve. 19 inside, which space 27 in turn through holes 28 in the wall of the sleeve 19 communicates with the inside of the axial bearing 21. Due to the involvement of the axial bearing 21 in the rotation of the impeller 11, the oil is circulated inside the hub housing 8, as marked by arrows 29.

Claims

449 463 a f "Patent claims"

1. A jet propulsion unit for ships, comprising a propeller pump with a pump housing (6), which at its inlet side is connected to a water inlet duct (3) and at its outlet side is connected to an outlet device (lay, 16) for direction of a jet of water and which contains a hub housing (8) stationary centrally in the flow path through the pump housing, in which the end of a drive shaft (10) projecting into the pump housing and supporting a impeller (11) is mounted, characteristic n_a that the end of the drive shaft (10) is mounted in the hub housing (8) by means of at least one rolling bearing (21) and that the hub housing (8) is liquid-tight closed relative to the water flow path through the pump housing and filled with lubricating oil, which is kept in circulation within the hub housing (8) under the influence of said rolling bearing (21) acting as a pump for the lubricating oil.

Assembly according to claim 1, characterized in that said roller bearing consists of a spherical thrust bearing (21) with an inner bearing ring mounted on the outside of the end of the drive shaft (10) and an outer bearing ring mounted in the hub housing, and the end of the drive shaft has an axial bore (25), which at its inner end through radial holes (26, 28) in the drive shaft communicates with the outside of the drive shaft close to the radially inner side of the roller bodies containing the gap between the two bearing rings (21) of the roller bearing (21).