CN103569338A - Novel high-efficiency low-noise low-vibration pump water-jet propeller - Google Patents
Novel high-efficiency low-noise low-vibration pump water-jet propeller Download PDFInfo
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- CN103569338A CN103569338A CN201310568056.2A CN201310568056A CN103569338A CN 103569338 A CN103569338 A CN 103569338A CN 201310568056 A CN201310568056 A CN 201310568056A CN 103569338 A CN103569338 A CN 103569338A
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Abstract
The invention discloses a novel high-efficiency low-noise low-vibration pump water-jet propeller. A rotor part is composed of impellers in two levels, and the impellers in two levels rotate counter. The first-level impeller has the characteristics of being high in side inclination, forward lengthwise inclination and impeller edge chord length, low in impeller grid density and the like, so that the suction performance and the stress performance are good, and the power capacity is high. In addition, when the novel high-efficiency low-noise low-vibration pump water-jet propeller works under the cavitation working conditions, cavitation is in an ultra-cavitation mode, cavitation cannot cause cavitation damage to materials, and cavitation noise is limited between the two levels of impellers and a shell body. The second-level impeller is a high-efficiency axial flow impeller. The two impellers rotate counter at the same speed, vortexes formed by the two impellers are opposite in direction and the same in size, instability and vibration caused by the vortex of a single impeller are eliminated, and therefore the pump water-jet propulsor is low in vibration and good in stability. The novel high-efficiency low-noise low-vibration pump water-jet propeller has the advantages of being efficient, low in noise, low in vibration, good in stability and the like and can be used as a propelling device of high-performance boats such as high-speed passenger ships and surface effect boats.
Description
Technical field
The invention belongs to a kind of marine pump hydraulic efficiency jet propulsion system, be specifically related to developing skill of axial vortex stability, cavitation and transmission efficiency and hydraulic efficiency.
Background technology
Axial-flow pump waterjet propulsor is that modern ships is a kind of compared with the Promoting Form of tool potentiality.Because its thrust performance is not subject to the impact of ship speed substantially, and mainly rotatable parts are included in pipeline, and safety is good, starts to obtain applying more and more widely in modern high performance boats and ships.
The axial wheel that axial-flow pump waterjet propulsor adopts is only at specific speed
n sin the scope of=(435 ~ 655), just have higher efficiency, outside this scope, efficiency is very low.And the operational factor of pump waterjet propulsor is determined according to identity of ship, will inevitably there is gap with the efficient operating ratio range of speed of axial-flow pump.If therefore adopt the impeller within the scope of high efficiency specific speed, need to adopt corresponding measure to supply this difference.The runner leaf grating of axial wheel belongs to large consistency leaf grating simultaneously, because flow is large, cavitation very easily occurs impeller is at work cavity or hole, can break or crumble and fall in cavity or hole in impeller vane runner, except meeting damages impeller vane, the form process nozzle that cavitation noise also can carry noise with liquid along pipeline is outwards propagated.In addition, during single axial wheel running, will inevitably form with impeller and turn to identical vortex band, the energy of vortex band is very large, and it forms periodic oscillation force to propulsion system, has a strong impact on the stability of propulsion system and boats and ships occupant's traveling comfort.
Summary of the invention
The object of the present invention is to provide the low vibratory pump waterjet propulsor of a kind of new and effective low noise, the performance of, low noise efficient to have, low vibration, is applicable to peculiar to vessel.
In order to solve above technical matters, the present invention, according to the feature of axial wheel, distributes the desired energy of axial-flow pump waterjet propulsor, second stage Impeller Design specific speed
n sin 435 ~ 655 higher efficiency range, then its complementary energy is born by first order impeller, and the thrust application thrust baring of both stage impellers is delivered on hollow shafting simultaneously, and the technical scheme of employing is as follows:
The low vibratory pump waterjet propulsor of low noise, comprise inlet channel (1), one-level impeller (2), sencond stage impeller (3), in establish the nozzle (5) of stator; The main body of stationary parts is fixedly connected with rear formation by inlet channel (1), housing (4) and nozzle (5); Rotor assembly matches with stationary parts by antifriction-bearing box B (10) and plain bearing A (13); It is characterized in that: described rotor assembly contains interior solid axle (12) and hollow outer shaft (11);
Described one-level impeller (2) the composition hollow shafting that is threaded with hollow outer shaft (11), hollow shafting is supported by antifriction-bearing box B (10) and plain bearing A (13), belt pulley (9) transferring power connecting through key B (8), sees that from power end one-level impeller (2) is for clockwise direction rotation;
It is upper that described sencond stage impeller (3) is arranged on wheel hub (18), by wheel hub (18) and key C (16), forms solid axle system with solid axle (12); Solid axle system is supported by antifriction-bearing box A (7) and antifriction-bearing box C (17), through key A (1) and coupler transferring power, from power end, sees that sencond stage impeller (3) is for anticlockwise direction rotation; At one-level impeller (2) wheel hub interior location, one secondary plain bearing B (14) is arranged between solid axle (12) and hollow shaft (11) to keep the concentricity between solid axle and hollow shaft; Axially, solid axle system matches with hollow shafting by thrust baring (15).
Described one-level impeller (2) wheel rim place chord length is greater than 0, thereby has large skew back characteristic and forward direction rake characteristic.
Described sencond stage impeller (3) specific speed
n sbetween 435 ~ 655.
The wheel rim place cascade solidity of described one-level impeller (2) is between 0.3 ~ 0.5.
The transmission of the thrust process thrust baring (15) that described sencond stage impeller (3) is suffered acts directly on the hollow shafting at one-level impeller (2) place.
working process of the present inventionas follows: current are inhaled into by inlet channel, first pass through one-level impeller, after one-level impeller, flow energy increases, can crumble and fall in the formed cavitation cavity of low-yield fluid or hole after first order impeller He before the impeller of the second stage, therefore cavitation processes can not cause cavitation to destroy to flow passage components, cavitation noise is limited between both stage impellers and housing, and one-level impeller obtains thrust simultaneously.The current that energy slightly increases enter second stage impeller subsequently, by impeller, are pressurizeed by stator rectification and are sprayed by nozzle, and second stage impeller obtains thrust.Thrust on two impellers is combined and is formed total thrust of the present invention.
the present invention has beneficial effect:the present invention, in order to keep the concentricity between solid axle and hollow shaft, increases single raise plain bearing (14).Because two impeller switched in opposite, rotating speed are identical, therefore formed axial vortex is cancelled out each other, thereby has reduced the vibration of propelling unit and corresponding hull.
One-level impeller (2) makes pump waterjet propulsor of the present invention have good cavitation performance, and its blade has large skew back characteristic, and cavitation performance is good, has effectively delayed cavitation inception, suck specific speed can reach 3000 and more than; The cascade solidity wheel rim place of one-level impeller (2) is less than 0.5, the crumbling and fall of cavity forming occurred in the space between one-level impeller downstream and sencond stage impeller upstream, therefore can not damage impeller itself, simultaneously, refraction action due to sound wave, cavity collapse and the hole formed noise of crumbling and fall is limited between both stage impellers and housing, is only no more than 5% acoustic wave energy along jet to external irradiation, so its noise is little.One-level impeller has forward direction rake characteristic, make impeller vane driving surface not be subject to the effect of centrifugal force of fluid, therefore impeller vane root Moment reduces, and the suffered centrifugal force of fluid moment in the impeller vane back side is that the formed moment of thrust is just in time contrary with workflow muscle power, also there is the effect that reduces impeller vane root Moment, so the mechanical characteristic that had of the impeller vane of forward direction rake.
Sencond stage impeller of the present invention plays supercharging, bears main acting function, and specific speed exists
n sin 435 ~ 655 scopes, make it have higher efficiency, the efficiency after orthogonalization is more than 85%; And at specific speed
n senergy requirement outside the scope of=(435 ~ 655) is born by one-level impeller, and the design that energy cascade of the present invention is born can make overall propulsion coefficient high as far as possible.
The desired energy of axial-flow pump waterjet propulsor is distributed, and second stage Impeller Design specific speed exists
n sin the higher efficiency range of=(435 ~ 655), then its complementary energy is born by first order impeller, and the thrust application thrust baring of both stage impellers is delivered on hollow shafting simultaneously, so hydraulic efficiency and energy machinery transmission efficiency are all higher; Both stage impellers, to turning, so just makes the two axial vortex opposite direction producing, big or small identical, thereby cancels out each other, and has therefore reduced the periodic swinging of propulsion system and boats and ships; First stage impeller adopts large skew back, forward direction rake, wheel rim place cascade solidity between 0.3 ~ 0.5, it is low consistency leaf grating, can there is again good acting ability, so cavitation (suction) performance is good, mechanical characteristic is good, also can not cause physics cavitation destruction, the noise that cavitation causes is also because of noise refraction principle and well below common single-stage vane pump waterjet propulsor simultaneously.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is the structural representation of rotor assembly of the present invention;
Fig. 3 is one-level paddle wheel plane view of the present invention, and the direction of arrow is that impeller turns to.
In figure: 1 inlet channel, 2 one-level impellers, 3 sencond stage impellers, 4 housings, 5 nozzles, 6 key A, 7 antifriction-bearing box A, 8 key B, 9 belt pulleys, 10 antifriction-bearing box B, 11 hollow shafts, 12 solid axles, 13 plain bearing A, 14 plain bearing B, 15 thrust barings, 16 key C, 17 antifriction-bearing box C, 18 wheel hubs.
The specific embodiment
Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail.
As shown in Figure 1, current are inhaled into by inlet channel 1, thereby by nozzle 5, are sprayed and produced propulsive thrust after one-level impeller 2 and sencond stage impeller 3 two-stage energization pressurizations.
Be illustrated in figure 2 the core component rotor assembly of this pump waterjet propulsor, this assembly contains inside and outside two axles: solid axle 12 and hollow shaft 11.The one-level impeller 2 composition hollow shafting that is threaded with hollow shaft 11, hollow shafting is supported by antifriction-bearing box B10 and plain bearing A13, and belt pulley 9 transferring power that connect through key B8 see that from power end one-level impeller 2 rotates for clockwise direction; Sencond stage impeller 3 is arranged on wheel hub 18, by wheel hub 18 and key C16 and solid axle 12, forming solid axles is, solid axle system is supported by antifriction-bearing box A7 and antifriction-bearing box C17, through key A6 and coupler transferring power, from power end, sees that sencond stage impeller 3 is for anticlockwise direction rotation.
The planar view of one-level impeller 2 as shown in Figure 3.
Utilize apparatus of the present invention, according to the real needs of certain propulsion of ship, the flow of the model pump waterjet propulsor calculating is 0.35m
3/ s, lift 16m, rotating speed is 1450r/min.The lift that distributes as follows both stage impellers: first order impeller lift is 2.5m, wheel rim place cascade solidity is 0.49, second stage impeller lift is 13.5m.Therefore second stage impeller specific speed is
n s=445, within the scope of the desired specific speed of efficient design.Rule of thumb statistics and numerical calculation, the pump waterjet propulsor efficiency that design obtains has improved 2 percentage points, the oscillation amplitude of pitching has reduced by 80%, and noise under cavitation condition is dropped to below 80dB by 85dB at interior propulsion system noise containing primary mover.
Claims (5)
1. the low vibratory pump waterjet propulsor of new and effective low noise, comprise inlet channel (1), one-level impeller (2), sencond stage impeller (3), in establish the nozzle (5) of stator; The main body of stationary parts is fixedly connected with rear formation by inlet channel (1), housing (4) and nozzle (5); Rotor assembly matches with stationary parts by antifriction-bearing box B (10) and plain bearing A (13); It is characterized in that: described rotor assembly contains interior solid axle (12) and hollow outer shaft (11);
Described one-level impeller (2) the composition hollow shafting that is threaded with hollow outer shaft (11), hollow shafting is supported by antifriction-bearing box B (10) and plain bearing A (13), belt pulley (9) transferring power connecting through key B (8), sees that from power end one-level impeller (2) is for clockwise direction rotation;
It is upper that described sencond stage impeller (3) is arranged on wheel hub (18), by wheel hub (18) and key C (16), forms solid axle system with solid axle (12); Solid axle system is supported by antifriction-bearing box A (7) and antifriction-bearing box C (17), through key A (1) and coupler transferring power, from power end, sees that sencond stage impeller (3) is for anticlockwise direction rotation; At one-level impeller (2) wheel hub interior location, one secondary plain bearing B (14) is arranged between solid axle (12) and hollow shaft (11) to keep the concentricity between solid axle and hollow shaft; Axially, solid axle system matches with hollow shafting by thrust baring (15).
2. a kind of new pump waterjet propulsor with the low vibration characteristic of low-noise efficient as claimed in claim 1, is characterized in that: described one-level impeller (2) wheel rim place chord length is greater than 0, has large skew back characteristic and forward direction rake characteristic.
3. a kind of new pump waterjet propulsor with the low vibration characteristic of low-noise efficient as claimed in claim 1, is characterized in that: described sencond stage impeller (3) specific speed
n sbetween 435 ~ 655.
4. a kind of new pump waterjet propulsor with the low vibration characteristic of low-noise efficient as claimed in claim 1, is characterized in that: the wheel rim place cascade solidity of described one-level impeller (2) is between 0.3 ~ 0.5.
5. a kind of new pump waterjet propulsor with the low vibration characteristic of low-noise efficient as claimed in claim 1, is characterized in that: the transmission of the thrust process thrust baring (15) that sencond stage impeller (3) is suffered acts directly on the hollow shafting at one-level impeller (2) place.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310568056.2A CN103569338A (en) | 2013-11-15 | 2013-11-15 | Novel high-efficiency low-noise low-vibration pump water-jet propeller |
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| CN201310568056.2A CN103569338A (en) | 2013-11-15 | 2013-11-15 | Novel high-efficiency low-noise low-vibration pump water-jet propeller |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104386230A (en) * | 2014-11-20 | 2015-03-04 | 江苏科技大学 | Pump water jet propeller vane wheel high in air dissolving performance |
| CN106103268A (en) * | 2014-03-12 | 2016-11-09 | 宋吉奉 | Centrifugal force propulsion plant and the boats and ships including this centrifugal force propulsion plant |
| CN106968963A (en) * | 2017-03-28 | 2017-07-21 | 江苏大学 | One kind is to rotation mixed flow pump configuration |
| CN109441839A (en) * | 2018-12-13 | 2019-03-08 | 上海交通大学 | Vertical double-rotor long-shaft pump |
| CN112278215A (en) * | 2020-09-29 | 2021-01-29 | 北京蔚蓝集智科技有限公司 | Water jet propulsion device and water jet propulsion method and application thereof |
| CN113815828A (en) * | 2021-09-23 | 2021-12-21 | 中国船舶工业集团公司第七0八研究所 | Inflatable water jet propeller |
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| US20060056956A1 (en) * | 2004-09-10 | 2006-03-16 | Tomohiro Fuse | Water jet propeller |
| CN102003405A (en) * | 2010-12-20 | 2011-04-06 | 北京理工大学 | Double-impeller serial pump with cone-shaped hubs |
| CN103291651A (en) * | 2013-06-08 | 2013-09-11 | 江苏科技大学 | Double-stage variable-speed oppositely-rotating axial flow pump flow passage component for water spraying propelling |
| CN103527521A (en) * | 2013-09-30 | 2014-01-22 | 华中科技大学 | Water jet propulsion pump |
| CN203638071U (en) * | 2013-11-15 | 2014-06-11 | 江苏科技大学 | Novel efficient low-noise low-vibration pump water propeller |
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Patent Citations (6)
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| WO2002055845A1 (en) * | 2001-01-11 | 2002-07-18 | Paolo Pietricola | A turbine engine |
| US20060056956A1 (en) * | 2004-09-10 | 2006-03-16 | Tomohiro Fuse | Water jet propeller |
| CN102003405A (en) * | 2010-12-20 | 2011-04-06 | 北京理工大学 | Double-impeller serial pump with cone-shaped hubs |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106103268A (en) * | 2014-03-12 | 2016-11-09 | 宋吉奉 | Centrifugal force propulsion plant and the boats and ships including this centrifugal force propulsion plant |
| CN104386230A (en) * | 2014-11-20 | 2015-03-04 | 江苏科技大学 | Pump water jet propeller vane wheel high in air dissolving performance |
| CN106968963A (en) * | 2017-03-28 | 2017-07-21 | 江苏大学 | One kind is to rotation mixed flow pump configuration |
| CN109441839A (en) * | 2018-12-13 | 2019-03-08 | 上海交通大学 | Vertical double-rotor long-shaft pump |
| CN112278215A (en) * | 2020-09-29 | 2021-01-29 | 北京蔚蓝集智科技有限公司 | Water jet propulsion device and water jet propulsion method and application thereof |
| CN112278215B (en) * | 2020-09-29 | 2023-08-22 | 北京蔚蓝集智科技有限公司 | Water spraying propulsion device and water spraying propulsion method and application thereof |
| CN113815828A (en) * | 2021-09-23 | 2021-12-21 | 中国船舶工业集团公司第七0八研究所 | Inflatable water jet propeller |
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Application publication date: 20140212 |