CN109606599A - A kind of Magnetic driving water jet propulsion pump with small hub than impeller - Google Patents
A kind of Magnetic driving water jet propulsion pump with small hub than impeller Download PDFInfo
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- CN109606599A CN109606599A CN201811646937.0A CN201811646937A CN109606599A CN 109606599 A CN109606599 A CN 109606599A CN 201811646937 A CN201811646937 A CN 201811646937A CN 109606599 A CN109606599 A CN 109606599A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H11/00—Marine propulsion by water jets
- B63H11/02—Marine propulsion by water jets the propulsive medium being ambient water
- B63H11/04—Marine propulsion by water jets the propulsive medium being ambient water by means of pumps
- B63H11/08—Marine propulsion by water jets the propulsive medium being ambient water by means of pumps of rotary type
Abstract
The invention belongs to field of fluid machinery, it is specifically related to a kind of Magnetic driving water jet propulsion pump with small hub than impeller, the impeller assembly being disposed coaxially in pump chamber including two groups, two groups of impeller assemblies are oppositely arranged, it include impeller shaft, the guide vane being fixed in impeller shaft and the impeller that impeller shaft is mounted on by bearing in impeller assembly described in each group, the impeller is that small hub compares impeller.The small hub that the present invention designs is more reasonable than blade wheel structure, hydraulic performance is excellent, and in the case where flow, lift meet design conditions requirement, wheel hub is reduced about 64% by the present invention, and impeller overall diameter reduces about 13%, significantly improves the conveyance capacity of impeller.
Description
Technical field
The invention belongs to field of fluid machinery, are specifically related to a kind of Magnetic driving hydraulic jet propulsion with small hub than impeller
Pump.
Background technique
Traditional water jet propulsion pump is driven using single-stage impeller, and motor and transmission parts are placed on around hull outside.
Therefore the conveyance capacity of water jet propulsion pump is low with acting ability；And motor is difficult to install with transmission parts, and leakproofness is poor, from
And causing the water jet propulsion pump service life short, high failure rate makes decreasing efficiency.
In addition, conventional water jet promotes pump impeller hub and impeller overall diameter larger, volume and weight is also corresponding larger, and impeller
Conveyance capacity it is poor, hydraulic efficiency is lower.
Summary of the invention
To solve the above-mentioned problems, the present invention provides a kind of Magnetic driving water jet propulsion pump with small hub than impeller, leaf
The wheel hub and overall diameter of wheel are smaller, substantially increase the conveyance capacity of impeller.
The present invention provides the following technical solutions:
A kind of Magnetic driving water jet propulsion pump with small hub than impeller, the impeller being disposed coaxially in pump chamber including two groups
Component, two groups of impeller assemblies are oppositely arranged, and are included impeller shaft in impeller assembly described in each group, are fixed on leading in impeller shaft
Leaf and the impeller that impeller shaft is mounted on by bearing, the impeller are that small hub compares impeller.
It preferably, further include pump case, the stator module inside pump case, separation sleeve and rotor assembly, the pump case
It is installed and is formed by the left shell, tubular middle casing and right shell body that are axially sequentially arranged along impeller, wherein first group of impeller sets
Guide vane in part is fixed far from second group of impeller assembly and with the left shell, the guide vane in second group of impeller assembly and the right side
Shell is fixed, the rotor assembly be arranged in small hub than the wheel rim of impeller at.
Preferably, the separation sleeve is located on the inside of middle casing, and described separation sleeve one end and left shell are tightly connected and another
One end and right shell body are tightly connected and are formed pump chamber, and the stator module is mounted on the outside of the separation sleeve, the rotor assembly
It is mounted on the inside of the separation sleeve；
Offer water inlet on the left shell, offer water outlet on the right shell body, the water inlet, water outlet with
The impeller shaft is coaxially arranged；
Guide vane in first group of impeller assembly and the impeller shaft in first group of impeller assembly and left shell weldering
It is connected in one；Guide vane in second group of impeller assembly and the impeller shaft in second group of impeller assembly and right shell body weldering
It is connected in one；
It is equipped with the step so that the insertion of described separation sleeve one end at the left shell inner wall, is equipped at the right shell body inner wall
So that the step of the separation sleeve other end insertion.
Preferably, the small hub includes the following steps: than the design method of impeller
S1, overall diameter D of the small hub than impeller is obtained；
S2, blade quantity and vane airfoil profile of the small hub than impeller are determined；
S3, small hub is obtained than cascade solidity s at the wheel rim of impelleryAnd wheel hub cascade solidity sg；
S4, use equidistant model split for m cylindrical cross-section than the blade of impeller small hub, the cylindrical cross-section is from wheel
Hub toward be successively denoted as at wheel rim 1-1,2-2 ..., m-m, obtain the aerofoil profile laying angle β of each cylindrical cross-section respectivelyL；
S5, to the aerofoil profile laying angle β in S4LValue be modified；
S6, vane thickness of the small hub than impeller is determined；
S7, the S1-S6 small hub obtained is modeled than the parameter of impeller, it is imitative to carry out numerical value to the impeller pattern built
Very, emulation lift value is obtained, if emulation lift value is within the scope of rated lift value, small hub is completed and compares Impeller Design；
If emulation lift value is in outside rated lift value range, it is transferred to S1 and recalculates, until emulation lift value is in
Within the scope of rated lift value.
Preferably, the specific steps of the S1 include:
S11, overall diameter estimated value D of the small hub than impeller is obtained by following formulaEstimated value,
Wherein, n is motor speed, and π is pi, nsFor the specific speed of wheel rim transfer tube, H is lift；
S12, small hub is obtained by following formula than impeller hub diameter d,
D=Rd*DEstimated value
Wherein, RdFor wheel hub ratio, DEstimated valueEstimated value for the small hub that is obtained in S11 than impeller overall diameter；
S13, actual value D of the small hub than impeller overall diameter is obtained by following formula,
Wherein, Q is flow, n is motor speed, and π is pi, and d is that small hub is obtained in S12 than impeller hub diameter.
Preferably, the quantity of blade is 3-5 in the S2, and the aerofoil profile of blade is NACA series aerofoil sections；
Actual value D by following formula to the small hub obtained in S13 than impeller overall diameter is checked:
If DIt checksWithin 0.1-0.3, belong to the range of small hub ratio, if DIt checksExcept 0.1-0.3, then pass through
S11-S13 reacquires overall diameter D of the small hub than impeller.
Preferably, the specific steps of the S3 include:
S31, cascade solidity s at wheel rim is obtained by following formulay,
sy=6.1751k+0.01254
Wherein,
nsFor the specific speed of wheel rim transfer tube；
S32, wheel hub cascade solidity s is obtained by following formulag,
sg=(1.7~2.1) sy
Preferably, the specific steps of the S4 include:
S41, the import laying angle β that each cylindrical cross-section is obtained by following formula1With outlet laying angle β2,
Wherein, β1' it is import fluid flow angle,U is peripheral speed, vmFor vane inlet flow rate on axial surface, For blade excretion coefficient, π is pi, ηvFor pump volumetric efficiency, D is small hub than impeller
Overall diameter, d are hub diameter of the small hub than impeller；Δβ1For inlet incidence angle；β2' to export fluid flow angle,
vu2For absolute velocity component in the circumferential direction,ηhFor the hydraulic efficiency of pump, ξ is correction factor, and g adds for gravity
Speed, H are lift；Δβ2Export the angle of attack；
S42, the aerofoil profile laying angle β that each cylindrical cross-section is obtained by following formulaL,
βL=(β1+β2)/2
It is preferably, modified in the S5 that detailed process is as follows:
The import laying angle β of m cylindrical cross-section is respectively obtained by the formula in S411Value, select near wheel rim
The diameter of section of three cylindrical cross-sections and corresponding import laying angle β1Value be fitted, obtain following quadratic polynomial:
y1=a1x2+b1x+c1
Wherein, y1For import laying angle β1, x is the diameter of section of cylindrical cross-section, a1、b1And c1It is constant,
The diameter of section of 1st to m-th cylindrical cross-section is substituted into above-mentioned quadratic polynomial respectively, obtains the 1st to m-th circle
The revised import laying angle β of column section1Value；
The outlet laying angle β of m cylindrical cross-section is respectively obtained by the formula in S412Value, select near wheel rim
The diameter of section of three cylindrical cross-sections and corresponding outlet laying angle β2Value be fitted, obtain following quadratic polynomial:
y2=a2x2+b2x+c2
Wherein, y2To export laying angle β2, x is the diameter of section of cylindrical cross-section, a2、b2And c2It is constant,
The diameter of section of 1st to m-th cylindrical cross-section is substituted into above-mentioned quadratic polynomial respectively, obtains the 1st to m-th circle
The revised outlet laying angle β of column section2Value,
By above-mentioned revised import laying angle β1With outlet laying angle β2The formula in S42 is substituted into, is obtained revised each
The aerofoil profile laying angle β of a cylindrical cross-sectionLValue.
Preferably, which is characterized in that vane thickness takes smaller value under conditions of meeting mechanical strength requirement in the S6,
And vane thickness is 2 to 4 times of wheel hub vane thickness at wheel rim, the vane thickness of rest part is in the change of uniform and smooth transition
Change.
The beneficial effects of the present invention are:
1, the present invention is different from the structure of previous Magnetic driving water jet propulsion pump, and inside uses stage impeller component, when two
Impeller is equidirectional while rotation then makes water jet propulsion pump have double power, improves conveyance capacity；When two impeller differences
Rotation, the then impeller not rotated have rectification, stablize the effect of pump chamber interior flow field；When two impeller opposite directions rotate simultaneously,
Then can ship be remained static.
Assembly method of the present invention is simple and sealing effect is good.The present invention is in assembly: guide vane and impeller are mounted on leaf
The installation of impeller assembly is completed on wheel shaft, and the first impeller assembly is fixed by guide vane and left shell, and the second impeller assembly is logical
It crosses guide vane to fix with right shell body, then separation sleeve and the left shell, right shell body is connected and sealed, then by stator module
It is installed on the outside of separation sleeve, middle casing and the left shell, right shell body is fixed respectively finally and complete to install.
2, water inlet is offered on left shell of the present invention, offers water outlet on the right shell body, the water inlet,
Water outlet and the impeller shaft are coaxially arranged, which makes pump case have symmetry, are conducive to processing and manufacturing, while being also conducive to mention
Height promotes the working performance of pump, for example improves propulsive force.
3, the present invention is for easier installation, by the guide vane and first group of impeller sets in first group of impeller assembly
Impeller shaft and the left shell in part are welded as a whole, by the guide vane and second group of impeller in second group of impeller assembly
Impeller shaft and the right shell body in component are welded as a whole.So during installation, it is only necessary to by bearing by corresponding leaf
Wheel is mounted on the installation that impeller assembly can be completed in impeller shaft, later carries out separation sleeve with the left shell, right shell body close
Stator module, is then installed on the outside of separation sleeve by envelope connection, finally by middle casing and the left shell, right shell body respectively into
Row is fixed to complete installation.
4, left shell of the present invention, right shell body inner wall can be semielliptical shape, open respectively in the left shell, right shell body
There is a step, place O-ring seal when installation in step, the left shell is inserted into, in right shell body in the separation sleeve both ends respectively
Step on the leakproofness of connection that had both greatly increased in this way, and mounting means is more convenient.
5, the small hub that the present invention designs is more reasonable than blade wheel structure, hydraulic performance is excellent, meets design in flow, lift
In the case where working condition requirement, wheel hub is reduced about 64% by the present invention, and impeller overall diameter reduces about 13%, significantly improves impeller
Conveyance capacity.
Detailed description of the invention
Fig. 1 is Magnetic driving water jet propulsion pump structural schematic diagram；
Fig. 2 is structural schematic diagram of the small hub than impeller blade；
Fig. 3 is small hub than impeller blade three-dimensional figure；
Fig. 4 is flow Q- lift H curve and flow Q- efficiency eta curve of the small hub than impeller numerical simulation；
Fig. 5 is velocity profile figure of the small hub than impeller numerical simulation；
Fig. 6 is pressure distribution figure at impeller blade intermediate cross-section；
Fig. 7 A be small hub than impeller lift compared with model experiment lift result；
Fig. 7 B be small hub than impeller adiabatic efficiency compared with model experiment efficiencies.
Attached meaning marked in the figure is as follows:
111- left shell 112- middle casing 113- right shell body 12- stator module 13- separation sleeve 14- rotor assembly
151- wheel shaft 152- guide vane 153- impeller 154- bearing 155- nut a- water inlet b- water outlet
Specific embodiment
The present invention is illustrated combined with specific embodiments below.
Embodiment 1
As shown in Figure 1, including two groups of impeller assemblies being disposed coaxially in pump chamber, two groups of impeller assemblies are oppositely arranged, often
Include impeller shaft 151, the guide vane 152 that is fixed in impeller shaft 151 in impeller assembly described in one group and is pacified by bearing 154
Mounted in the impeller 153 of impeller shaft 151, the impeller is that small hub compares impeller.
Embodiment 2
As shown in Figure 1, on the basis of embodiment 1, the Magnetic driving water jet propulsion pump further includes pump case, is located in pump case
Stator module 12, separation sleeve 13 and the rotor assembly 14 in portion, the pump case is by the left shell that is axially sequentially arranged along impeller
111, tubular middle casing 112 and the installation of right shell body 113 are formed, wherein the guide vane in first group of impeller assembly is far from second group
Impeller assembly and, guide vane and the right shell body 113 fixation in second group impeller assembly fixed with the left shell 111, it is described
Rotor assembly be arranged in small hub than the wheel rim of impeller at.
Embodiment 3
As shown in Figure 1, the separation sleeve 13 is located at 112 inside of middle casing, the isolation on the basis of embodiment 2
It covers 13 one end and left shell 111 is tightly connected and the other end and right shell body 113 are tightly connected and form pump chamber, the stator module
12 are mounted on 13 outside of separation sleeve, and the rotor assembly 14 is mounted on 13 inside of separation sleeve；
Water inlet a is offered on the left shell 111, and water outlet b, the water inlet are offered on the right shell body 113
A, water outlet b and the impeller shaft 151 are coaxially arranged；
Guide vane 152 in first group of impeller assembly and impeller shaft 151 and the left side in first group of impeller assembly
Shell 111 is welded as a whole；The impeller shaft 11 in guide vane 152 and second group of impeller assembly in second group of impeller assembly with
And the right shell body 113 is welded as a whole；
The step so that insertion of 13 one end of the separation sleeve is equipped at 111 inner wall of left shell, in the right shell body 113
The step so that insertion of 13 other end of the separation sleeve is equipped at wall.
Embodiment 4
On the basis of embodiment any one of 1-3, waterpower of a certain Magnetic driving water jet propulsion pump small hub than Impeller Design
Design parameter are as follows: lift H=2m, flow Q=270m3/ h, motor speed n=1450r/min, specific speed ns=862.
S1, overall diameter D of the small hub than impeller is obtained；
S11, overall diameter estimated value D of the small hub than impeller is obtained by following formulaEstimated value,
The overall diameter estimated value D of impellerEstimated valueRound numbers is 188mm,
S12, small hub is obtained by following formula than impeller hub diameter d,
D=Rd*DEstimated value=37.6mm
Hub diameter d round numbers is 38mm.
S13, actual value D of the small hub than impeller overall diameter is obtained by following formula,
Actual value D round numbers of the small hub than impeller overall diameter is 164mm
Impeller shape dimensional check is carried out by following formula:
Then with D=164mm, dh=38mm, as pump parameters of basic dimensions, at this time Rd=dh/D2=0.232, it is located at 0.1-
Between 0.3, belong to the range of small hub ratio.
S2, blade quantity and vane airfoil profile of the small hub than impeller are determined；
For small hub than the number of blade of impeller excessively by obvious aggravation wheel hub blade to the exclusion phenomenon of fluid, the number of blade is fixed
For 3-5 piece, with specific speed nsIncrease and reduce.And the specific speed n of the present embodiment pumps=862 belong to intermediate specific speed section,
Therefore the number of blade takes 4, vane airfoil profile uses NACA4406 series aerofoil sections.
S3, small hub is obtained than cascade solidity s at the wheel rim of impelleryAnd wheel hub cascade solidity sg；
S31, cascade solidity s at wheel rim is obtained by following formulay,
sy=6.1751k+0.01254
Wherein,
By calculating, sy=0.8153,
When continuing to use traditional design method design small hub impeller, impeller can be made to distort near wheel hub seriously, chord length is too small,
Even appearing in wheel hub goes out the fluid situation opposite with main flow direction, causes blade that can not design.Therefore, it is necessary to count to tradition
Formula is calculated to be modified.Overall correction strategy is the chord length for increasing impeller near wheel hub, and should increase the leaf of wheel hub in right amount
Grid consistency is being unlikely to make to export lift near increase wheel hub under exclusion excessively serious situation.
S32, wheel hub cascade solidity s is obtained by following formulag,
sg=(1.7~2.1) sy
Wherein, sgIn higher specific speed, take large values,
For the present embodiment, sg=1.7sy, sg=1.3859.
Other positions cascade solidity uniformly increases from wheel rim towards wheel hub direction according to linear variability law.
S4, use equidistant model split for m cylindrical cross-section than the blade of impeller small hub, the cylindrical cross-section is from wheel
Hub toward be successively denoted as at wheel rim 1-1,2-2 ..., m-m, obtain the aerofoil profile laying angle β of each cylindrical cross-section respectivelyL；
S41, the import laying angle β that each cylindrical cross-section is obtained by following formula1With outlet laying angle β2,
Wherein, β '1For import fluid flow angle,U is peripheral speed, vmFor vane inlet flow rate on axial surface, For blade excretion coefficient, π is pi, ηvFor pump volumetric efficiency, D is small hub than impeller
Overall diameter, d are hub diameter of the small hub than impeller；Δβ1For inlet incidence angle；β2' to export fluid flow angle,
vu2For absolute velocity component in the circumferential direction,ηhFor the hydraulic efficiency of pump, ξ is correction factor, and g adds for gravity
Speed, H are lift；Δβ2Export the angle of attack；
S42, the aerofoil profile laying angle β that each cylindrical cross-section is obtained by following formulaL
βL=(β1+β2)/2
The import laying angle β of the first to m-th cylindrical cross-section is obtained by the formula in S411Value, select near wheel
The diameter of section of three cylindrical cross-sections of edge and corresponding import laying angle β1Value be fitted, obtain following secondary multinomial
Formula:
y1=a1x2+b1x+c1
Wherein, y1For import laying angle β1, x is the diameter of section of cylindrical cross-section, a1、b1And c1For constant,
The diameter of section of the first to m-th cylindrical cross-section is substituted into above-mentioned quadratic polynomial respectively, obtains the first to m-th
The revised import laying angle β of cylindrical cross-section1Value；
The outlet laying angle β of the first to m-th cylindrical cross-section is obtained by the formula in S412Value, select near wheel
The diameter of section of three cylindrical cross-sections of edge and corresponding outlet laying angle β2Value be fitted, obtain following secondary multinomial
Formula:
y2=a2x2+b2x+c2
Wherein, y2To export laying angle β2, x is the diameter of section of cylindrical cross-section, a2、b2And c2For constant,
The diameter of section of the first to m-th cylindrical cross-section is substituted into above-mentioned quadratic polynomial respectively, obtains the first to m-th
The revised outlet laying angle β of cylindrical cross-section2Value,
By the formula in S42, above-mentioned revised import laying angle β is substituted into1With outlet laying angle β2, after being corrected
Each cylindrical cross-section aerofoil profile laying angle βLValue.
The value of m is 7 in the present embodiment,
The import laying angle β of each cylindrical cross-section is obtained by the formula in S411Value, wherein section 1-1 is
57.83, section 2-2 are 44.90, and section 3-3 is 36.31, and section 4-4 is 30.54, and section 5-5 is 26.57, and section 6- is
23.78, section 7-7 are 21.83；
Select the import laying angle β of section 4-4, section 5-5, section 6-61For dependent variable y, the diameter of section of respective cross-section
It for independent variable x, is fitted, obtains following formula,
Y=59.25-0.38x+0.00095x2
According to above-mentioned formula to the import laying angle β of each cylindrical cross-section1Value be modified, obtain revised value,
Wherein, section 1-1 is 46.05, and section 2-2 is 39.93, and section 3-3 is 34.64, and section 4-4 is 30.19, and section 5-5 is
26.57, section 6-6 are 23.78, and section 7-7 is 21.83；
The outlet laying angle β of each cylindrical cross-section is obtained by the formula in S412Value, wherein section 1-1 be-
46.56, section 2-2 are -85.37, and section 3-3 is 61.96, and section 4-4 is -43.99, and section 5-5 is 34.14, and section 6-6 is
28.18, section 7-7 are 24.30；
Select the outlet laying angle β of section 4-4, section 5-5, section 6-62For dependent variable y, the diameter of section of respective cross-section
It for independent variable x, is fitted, obtains following formula,
Y=109.89-0.91x+0.0024x2
According to above-mentioned formula to the outlet laying angle β of each cylindrical cross-section2Value be modified, obtain revised value,
Wherein, section 1-1 is 48.77, and section 2-2 is 64.49, and section 3-3 is 52.30, and section 4-4 is 42.18, and section 5-5 is
34.14, section 6-6 are 28.18, and section 7-7 is 24.30；
By the formula in S42, above-mentioned revised import laying angle β is substituted into1With outlet laying angle β2, after being corrected
Each cylindrical cross-section aerofoil profile laying angle βLValue, wherein section 1-1 is 62.41, and section 2-2 is 52.21, and section 3-3 is
43.37, section 4-4 are 36.19, and section 5-5 is 30.36, and section 6-6 is 25.98, and section 7-7 is 23.07
S6, vane thickness of the small hub than impeller is determined；
It is 10mm that the present embodiment, which takes maximum blade thickness at wheel rim, and wheel hub maximum blade thickness is 5mm, according to
NACA4406 aerofoil profile is thickeied.
S7, the present invention verify the above method using computation fluid dynamics technology, first, in accordance with above-mentioned design side
The small hub of method design carries out two designs than impeller hydraulic model in CAD；Secondly, designed hydraulic model is imported three
It ties up in design software, generates three-dimensional blades entity (as shown in Figure 3), be further processed on this basis, obtain three-dimensional meter
Calculate water body；Again, the model handled well is imported into grid dividing software ANSYS ICEM and carries out grid dividing；Last applicating fluid
Flow dynamics analysis software ANSYS CFX or ANSYS FLUENT etc. carries out numerical simulation, wherein calculation method and boundary condition
It is arranged as follows
Discrete, the control of Numerical simulation of 3-D turbulent is carried out to three-dimensional incompressible fluid governing equation using finite volume method
When equation processed includes cavitation model based on two phase flow mixed model, Reynolds (RANS) Na Wei-Stokes (N-S) equation with
And be more suitable fluid separation SST k- ω (shear stress transport) turbulence model.The discrete use of governing equation
Control volume mothod, equation diffusion term are center difference scheme, and convective term is Second-order Up-wind format.Equation solution is hidden using separation half
Formula coupling pressure algorithm.Inlet boundary condition uses stagnation pressure import, and export boundary condition is exported using mass flow, Wall-function
Using without sliding wall surface, reference pressure 0Pa, the energy transmission use between rotary part (impeller) and stationary parts (guide vane)
" Frozen Rotor " mode connects, and calculates convergence and is set as 10-5, medium is 25 ° of water.
Calculated result analysis:
Fig. 4 is small hub than the flow Q- lift H curve and flow Q- efficiency eta curve of impeller numerical simulation, can from figure
To obtain, the lift pumped under design conditions is 2.05m.By numerical simulation result and rated lift Hdes=2m is compared, error
2.5%, which demonstrates the accuracy of the design method in engineering error allowable range.
Fig. 5 be small hub than impeller numerical simulation velocity profile figure, it can be seen from the figure that fluid enter impeller it
Preceding water flow is relatively uniform, and water constantly rotates acting after high-speed rotating impeller, is rotated near exit water flow by impeller
Influence present corkscrew motion.All in all, without obvious secondary back phenomenon, the flow effect of water is preferable.
Fig. 6 is pressure distribution figure at impeller blade intermediate cross-section, it can be seen from the figure that influenced by blade rotation,
Occurs uniformly distributed low-pressure area at vane inlet, pressure distribution is more uniform at blade exit.
For the accuracy for further verifying this method, numerical simulation result is compared analysis with model experiment results.
From Fig. 7 A, 7B it can be concluded that, in operating point for design, the experiment lift H of pumpexp=2.01m, numerical simulation result and model experiment
It compares, error 1.99%.Relative efficiency curve it can be concluded that, numerical simulation efficiency is 84.5%, and model experiment efficiency is
80.7%, error is only 4.7%.It can be seen that being fully able to meet using small hub impeller more resulting than method for designing impeller
Design needs, while also demonstrating the accuracy of this method.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, although referring to aforementioned reality
Applying example, invention is explained in detail, for those skilled in the art, still can be to aforementioned each implementation
Technical solution documented by example is modified or equivalent replacement of some of the technical features.It is all in essence of the invention
Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of Magnetic driving water jet propulsion pump with small hub than impeller, which is characterized in that be disposed coaxially on pump including two groups
Intracavitary impeller assembly, two groups of impeller assemblies are oppositely arranged, and include impeller shaft (151) in impeller assembly described in each group, solid
The guide vane (152) that is scheduled on impeller shaft (151) and the impeller (153) that impeller shaft (151) are mounted on by bearing (154), institute
Stating impeller is that small hub compares impeller.
2. a kind of Magnetic driving water jet propulsion pump with small hub than impeller according to claim 1, which is characterized in that also
Stator module (12), separation sleeve (13) and rotor assembly (14) including pump case, inside pump case, the pump case is by along leaf
Wheel shaft is formed to left shell (111), tubular middle casing (112) and right shell body (113) installation being sequentially arranged, wherein first
Guide vane in group impeller assembly is far from second group of impeller assembly and fixed with the left shell (111), in second group of impeller assembly
Guide vane and the right shell body (113) it is fixed, the rotor assembly be arranged in small hub than the wheel rim of impeller at.
3. a kind of Magnetic driving water jet propulsion pump with small hub than impeller according to claim 2, which is characterized in that institute
It states separation sleeve (13) to be located on the inside of middle casing (112), described separation sleeve (13) one end and left shell (111) are tightly connected and another
One end and right shell body (113) are tightly connected and are formed pump chamber, and the stator module (12) is mounted on the outside of the separation sleeve (13),
The rotor assembly (14) is mounted on the inside of the separation sleeve (13)；
Offer water inlet (a) on the left shell (111), offer water outlet (b) on the right shell body (113), it is described into
The mouth of a river (a), water outlet (b) and the impeller shaft (151) are coaxially arranged；
Guide vane (152) in first group of impeller assembly and impeller shaft (151) and the left side in first group of impeller assembly
Shell (111) is welded as a whole；Guide vane (152) in second group of impeller assembly and the impeller shaft in second group of impeller assembly
(11) and the right shell body (113) is welded as a whole；
The step so that insertion of the separation sleeve (13) one end, the right shell body (113) are equipped at left shell (111) inner wall
The step so that insertion of the separation sleeve (13) other end is equipped at inner wall.
4. a kind of Magnetic driving water jet propulsion pump with small hub than impeller according to claim 1-3, special
Sign is that the small hub includes the following steps: than the design method of impeller
S1, overall diameter D of the small hub than impeller is obtained；
S2, blade quantity and vane airfoil profile of the small hub than impeller are determined；
S3, small hub is obtained than cascade solidity s at the wheel rim of impelleryAnd wheel hub cascade solidity sg；
S4, use equidistant model split for m cylindrical cross-section than the blade of impeller small hub, the cylindrical cross-section is past from wheel hub
Successively be denoted as at wheel rim 1-1,2-2 ..., m-m, obtain the aerofoil profile laying angle β of each cylindrical cross-section respectivelyL；
S5, to the aerofoil profile laying angle β in S4LValue be modified；
S6, vane thickness of the small hub than impeller is determined；
S7, the S1-S6 small hub obtained is modeled than the parameter of impeller, numerical simulation is carried out to the impeller pattern built,
Emulation lift value is obtained, if emulation lift value is within the scope of rated lift value, small hub is completed and compares Impeller Design；
If emulation lift value is in outside rated lift value range, it is transferred to S1 and recalculates, until emulation lift value is in design
Within the scope of lift value.
5. a kind of Magnetic driving water jet propulsion pump with small hub than impeller according to claim 4, which is characterized in that institute
The specific steps for stating S1 include:
S11, overall diameter estimated value D of the small hub than impeller is obtained by following formulaEstimated value,
Wherein, n is motor speed, and π is pi, nsFor the specific speed of wheel rim transfer tube, H is lift；
S12, small hub is obtained by following formula than impeller hub diameter d,
D=Rd*DEstimated value
Wherein, RdFor wheel hub ratio, DEstimated valueEstimated value for the small hub that is obtained in S11 than impeller overall diameter；
S13, actual value D of the small hub than impeller overall diameter is obtained by following formula,
Wherein, Q is flow, n is motor speed, and π is pi, and d is that small hub is obtained in S12 than impeller hub diameter.
6. a kind of Magnetic driving water jet propulsion pump with small hub than impeller according to claim 4, which is characterized in that institute
The quantity for stating blade in S2 is 3-5, and the aerofoil profile of blade is NACA series aerofoil sections；
Actual value D by following formula to the small hub obtained in S13 than impeller overall diameter is checked:
If DIt checksWithin 0.1-0.3, belong to the range of small hub ratio, if DIt checksExcept 0.1-0.3, then pass through S11-
S13 reacquires overall diameter D of the small hub than impeller.
7. a kind of small hub suitable for wheel rim transfer tube according to claim 4 is than method for designing impeller, feature exists
In the specific steps of the S3 include:
S31, cascade solidity s at wheel rim is obtained by following formulay,
sy=6.1751k+0.01254
Wherein,
nsFor the specific speed of wheel rim transfer tube；
S32, wheel hub cascade solidity s is obtained by following formulag,
sg=(1.7~2.1) sy
8. a kind of Magnetic driving water jet propulsion pump with small hub than impeller according to claim 4, which is characterized in that institute
The specific steps for stating S4 include:
S41, the import laying angle β that each cylindrical cross-section is obtained by following formula1With outlet laying angle β2,
Wherein, β '1For import fluid flow angle,U is peripheral speed, vmFor vane inlet flow rate on axial surface, For blade excretion coefficient, π is pi, ηvFor pump volumetric efficiency, D is small hub than impeller
Overall diameter, d are hub diameter of the small hub than impeller；Δβ1For inlet incidence angle；β′2To export fluid flow angle,
vu2For absolute velocity component in the circumferential direction,ηhFor the hydraulic efficiency of pump, ξ is correction factor, and g adds for gravity
Speed, H are lift；Δβ2Export the angle of attack；
S42, the aerofoil profile laying angle β that each cylindrical cross-section is obtained by following formulaL,
βL=(β1+β2)/2
9. a kind of small hub suitable for wheel rim transfer tube according to claim 4 is than method for designing impeller, feature exists
In modified in the S5 detailed process is as follows:
The import laying angle β of m cylindrical cross-section is respectively obtained by the formula in S411Value, select near three of wheel rim
The diameter of section of cylindrical cross-section and corresponding import laying angle β1Value be fitted, obtain following quadratic polynomial:
y1=a1x2+b1x+c1
Wherein, y1For import laying angle β1, x is the diameter of section of cylindrical cross-section, a1、b1And c1It is constant,
The diameter of section of 1st to m-th cylindrical cross-section is substituted into above-mentioned quadratic polynomial respectively, the 1st to m-th cylinder is obtained and cuts
The revised import laying angle β in face1Value；
The outlet laying angle β of m cylindrical cross-section is respectively obtained by the formula in S412Value, select near three of wheel rim
The diameter of section of cylindrical cross-section and corresponding outlet laying angle β2Value be fitted, obtain following quadratic polynomial:
y2=a2x2+b2x+c2
Wherein, y2To export laying angle β2, x is the diameter of section of cylindrical cross-section, a2、b2And c2It is constant,
The diameter of section of 1st to m-th cylindrical cross-section is substituted into above-mentioned quadratic polynomial respectively, the 1st to m-th cylinder is obtained and cuts
The revised outlet laying angle β in face2Value,
By above-mentioned revised import laying angle β1With outlet laying angle β2The formula in S42 is substituted into, revised each circle is obtained
The aerofoil profile laying angle β of column sectionLValue.
10. a kind of small hub suitable for wheel rim transfer tube according to claim 4 is than method for designing impeller, feature exists
In vane thickness takes smaller value under conditions of meeting mechanical strength requirement in the S6, and vane thickness is wheel hub at wheel rim
2 to 4 times for locating vane thickness, the vane thickness of rest part are in the variation of uniform and smooth transition.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020134126A1 (en) * | 2018-12-29 | 2020-07-02 | 合肥工业大学 | Method for designing impeller having a small hub ratio, and rim pump obtained using said method |
| CN112061357A (en) * | 2020-09-21 | 2020-12-11 | 吉林大学 | Pump jet propeller without transmission shaft |
| CN112078770A (en) * | 2019-11-14 | 2020-12-15 | 浙江大学 | Full-conduit type two-stage pod propeller and design method thereof |
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| US6991426B2 (en) * | 2001-01-11 | 2006-01-31 | Paolo Pietricola | Variable pitch fan |
| CN101888948A (en) * | 2007-12-28 | 2010-11-17 | 川崎重工业株式会社 | Thrust generator |
| CN107226189A (en) * | 2017-05-24 | 2017-10-03 | 武汉理工大学 | A kind of electromagnetism peculiar to vessel is to turning to have hub wheel rim hydraulic propeller |
| CN206943021U (en) * | 2017-04-28 | 2018-01-30 | 合肥工业大学 | A kind of Magnetic driving formula water jet propulsion pump |
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| US6379113B1 (en) * | 1999-11-16 | 2002-04-30 | Chang Sun Kim | Propeller apparatus |
| US6991426B2 (en) * | 2001-01-11 | 2006-01-31 | Paolo Pietricola | Variable pitch fan |
| CN101888948A (en) * | 2007-12-28 | 2010-11-17 | 川崎重工业株式会社 | Thrust generator |
| CN206943021U (en) * | 2017-04-28 | 2018-01-30 | 合肥工业大学 | A kind of Magnetic driving formula water jet propulsion pump |
| CN107226189A (en) * | 2017-05-24 | 2017-10-03 | 武汉理工大学 | A kind of electromagnetism peculiar to vessel is to turning to have hub wheel rim hydraulic propeller |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2020134126A1 (en) * | 2018-12-29 | 2020-07-02 | 合肥工业大学 | Method for designing impeller having a small hub ratio, and rim pump obtained using said method |
| CN112078770A (en) * | 2019-11-14 | 2020-12-15 | 浙江大学 | Full-conduit type two-stage pod propeller and design method thereof |
| CN112078770B (en) * | 2019-11-14 | 2021-08-03 | 浙江大学 | Full-conduit type two-stage pod propeller and design method thereof |
| CN112061357A (en) * | 2020-09-21 | 2020-12-11 | 吉林大学 | Pump jet propeller without transmission shaft |
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