CN107693868A - heart pump method for designing impeller and impeller - Google Patents
heart pump method for designing impeller and impeller Download PDFInfo
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- CN107693868A CN107693868A CN201710733191.6A CN201710733191A CN107693868A CN 107693868 A CN107693868 A CN 107693868A CN 201710733191 A CN201710733191 A CN 201710733191A CN 107693868 A CN107693868 A CN 107693868A
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
- A61M60/20—Type thereof
- A61M60/205—Non-positive displacement blood pumps
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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Abstract
The invention provides a kind of heart pump method for designing impeller and impeller, it is related to field of medical device.This method first calculates the parameter of various impellers and pump, then according to the size calculated, draws out preliminary flow channel of axial plane, and then determine flow channel of axial plane shape；Then, selection and calculate inlet side blade angle and to meridian streamline branch and draw streamline grid, so that it is determined that thickening vanes figure and blade form drawing, the heart impeller of pump hydraulic optimization based on haemolysis shearing rate index finally carries out the optimization of impeller ability scour hole again, is met the receded disk impeller of haemolysis physical signs.The impeller is designed by heart pump method for designing impeller as described above and gone out, including wheel base and blade, and balance pipe is offered vertically on the wheel base.The present invention, which solves existing heart pump Impeller Design, to be needed to make the technical problem of model machine.
Description
Technical field
The present invention relates to technical field of medical equipment, more particularly, to a kind of heart pump method for designing impeller and impeller.
Background technology
Heart pump is the device of the part or all of replacement cardiac pumping function of the serious heart failure patient of co-treatment, from
Axle stream, centrifugation, oblique flow etc. can be divided into impeller in direction of flow of blood.
Existing heart pump Impeller Design considers the hydraulic performance of heart pump pump blood mostly, with reference to impeller base material, table
Finishing coat etc., the remodeling after being verified by prototype experiment optimize to ensure the physiological compatibility of heart pump.
Based on this, the invention provides a kind of heart pump method for designing impeller and impeller to solve above-mentioned technical problem.
The content of the invention
It is an object of the invention to provide a kind of heart pump method for designing impeller, is set with solving existing heart impeller of pump
Meter needs to make the technical problem of model machine.
The present invention also aims to provide a kind of impeller, for solving the easily thrombosed technical problem of existing impeller.
Based on above-mentioned first purpose, the invention provides a kind of heart pump method for designing impeller, comprise the following steps：
Step 1, blade shape is determined by the specific speed for calculating pump；
Step 2, calculate the efficiency of pump；
Step 3, calculate the shaft power and original machine power of pump；
Step 4, determine the inlet diameter of pump, outlet diameter, inlet velocity, muzzle velocity；
Step 5, determine that impeller inlet diameter, vane inlet go out diameter, impeller outlet width and impeller outlet diameter；
Step 6, the size calculated according to step 2 into step 4, preliminary flow channel of axial plane is drawn out, and then determined
Flow channel of axial plane shape；
Step 7, selection and calculating inlet side blade angle；
Step 8, to meridian streamline branch and draw streamline grid；
Step 9, determine thickening vanes figure and blade form drawing；
Step 10, the heart impeller of pump hydraulic optimization based on haemolysis shearing rate index；
Step 11, the effect of optimization based on step 10, carry out the optimization of impeller ability scour hole.
Optionally, in step 1, the specific speed calculation formula of pump isWherein Q is flow, and H is to raise
Journey, n are rotating speed.
Optionally, in step 2, pump is first calculated
Hydraulic efficiency
Volumetric efficiency
Mechanical efficiencyFinally calculate
Gross efficiency η=ηhηmηv。
Optionally, in step 3, the shaft power calculation formula of pump is
Original machine power calculation formula is pg=Kgp/ηt, wherein KgFor safety coefficient, ηtFor prime mover efficiency.
Optionally, in step 4, the inlet diameter of pump isThe outlet diameter D of pumpd=Ds, the import of pump
SpeedThe muzzle velocity V of pumpd=Vs, wherein, VsFor the inlet velocity of pump.
Optionally, in step 6, the size that is calculated into step 4 according to step 2 first draws out preliminary axial plane stream
Road, cross-section of river runner inspection is then carried out to it, flow channel of axial plane shape is determined according to the result of cross-section of river runner inspection.
Optionally, in step 10, full runner hydraulic model modeling is carried out first, then carries out mesh generation, then carry out net
Lattice independence is verified, is finally carried out result of calculation analysis and is determined improvement project and tentatively optimize.
Optionally, it is modeled using UG, mesh generation is carried out using the ICEM under ANSYS softwares.
Optionally, in step 11, hydraulic model modeling and mesh generation are carried out first, then carry out interpretation of result.
Based on above-mentioned second purpose, the invention provides a kind of impeller, the impeller is by heart impeller of pump as described above
Design method is designed and gone out, including wheel base and blade, and balance pipe is offered vertically on the wheel base.
The present invention proposes the design optimization method and the final optimization leaf with scour hole of a kind of centrifugal heart impeller of pump
Wheel form, with reference to the Osima jacoti, Osima excavata index of blood haemolysis, fluid (is calculated by CFD in impeller hydraulic model design optimization
Mechanics) means, by the accurate seizure to heart pump internal flow boundary shear stress with assessing, it is not necessary to make model machine, realize
The optimization design of impeller waterpower molded line, the on this basis technology such as bond material, coating, it is ensured that the physiological compatibility of heart pump
Index.
Brief description of the drawings
, below will be to tool in order to illustrate more clearly of the specific embodiment of the invention or technical scheme of the prior art
The required accompanying drawing used is briefly described in body embodiment or description of the prior art, it should be apparent that, in describing below
Accompanying drawing be some embodiments of the present invention, for those of ordinary skill in the art, do not paying creative work
Under the premise of, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is cross-section of river change curve；
Fig. 2 is flow channel of axial plane shape；
Fig. 3 is flow channel of axial plane division figure；
Fig. 4 is impeller inlet side and impeller inlet speed triangle；
Fig. 5 is meridian streamline branch；
Fig. 6 is streamline grid；
Fig. 7 is thickening vanes figure；
Fig. 8 is blade form drawing；
Fig. 9 is the full runner three-dimensional hydraulic illustraton of model of pump；
Figure 10 is impeller pattern figure
Figure 11 is the relation curve of lift, efficiency, maximum shear stress and number of grid；
Figure 12 is impeller speed polar plot；
Figure 13 is impeller three-dimensional motion pattern；
Figure 14 is shearing stress percentage in pump；
Figure 15 is the shear Stress Distribution of blade surface；
Figure 16 is the heart impeller of pump after optimization；
Figure 17 is the percentage shared by pump shearing stress after optimizing；
Figure 18 is the structure chart after impeller perforate；
Figure 19 is the blade wheel structure figure of different perforates；
Figure 20 is the geometrical model figure of pump after perforate；
Figure 21 is impeller behind gap motion pattern；
Figure 22 is A sections impeller internal motion pattern in Figure 18；
Figure 23 is the wall shear stress figure of back shroud of impeller gap location；
Figure 24 is the structural representation of impeller embodiment impeller.
Icon：1- takes turns base；2- blades；3- balance pipes.
Embodiment
Technical scheme is clearly and completely described below in conjunction with accompanying drawing, it is clear that described reality
It is part of the embodiment of the present invention to apply example, rather than whole embodiments.It is common based on the embodiment in the present invention, this area
The every other embodiment that technical staff is obtained under the premise of creative work is not made, belong to what the present invention protected
Scope.
In the description of the invention, it is necessary to explanation, term " " center ", " on ", " under ", "left", "right", " vertical ",
The orientation or position relationship of the instruction such as " level ", " interior ", " outer " be based on orientation shown in the drawings or position relationship, be only for
It is easy to the description present invention and simplifies description, rather than instruction or implies that signified device or element there must be specific side
Position, with specific azimuth configuration and operation, therefore be not considered as limiting the invention.In addition, term " first ", " the
Two ", " the 3rd " is only used for describing purpose, and it is not intended that instruction or hint relative importance.
In the description of the invention, it is necessary to illustrate, unless otherwise clearly defined and limited, term " installation ",
" connected ", " connection " should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected, or integratedly be connected
Connect；Can be mechanical connection or electrical connection；Can be joined directly together, can also be indirectly connected by intermediary,
It can be the connection of two element internals.For the ordinary skill in the art, above-mentioned art can be understood with concrete condition
The concrete meaning of language in the present invention.
Heart pump method for designing impeller embodiment
A kind of heart pump method for designing impeller is provided in the present embodiment, and the heart pump method for designing impeller includes
Following steps：
Step 1, blade shape is determined by the specific speed for calculating pump；
Step 2, calculate the efficiency of pump；
Step 3, calculate the shaft power and original machine power of pump；
Step 4, determine the inlet diameter of pump, outlet diameter, inlet velocity, muzzle velocity；
Step 5, determine that impeller inlet diameter, vane inlet go out diameter, impeller outlet width and impeller outlet diameter；
Step 6, the size calculated according to step 2 into step 4, preliminary flow channel of axial plane is drawn out, and then determined
Flow channel of axial plane shape；
Step 7, selection and calculating inlet side blade angle；
Step 8, to meridian streamline branch and draw streamline grid；
Step 9, determine thickening vanes figure and blade form drawing；
Step 10, the heart impeller of pump hydraulic optimization based on haemolysis shearing rate index；
Step 11, the effect of optimization based on step 10, carry out the optimization of impeller ability scour hole.
This application provides a kind of centrifugal heart impeller of pump for meeting haemolysis physical signs to standardize optimization design stream
Journey, it can be designed that the receded disk impeller for meeting haemolysis physical signs, it is not necessary to make model machine inspection.
A specific embodiment is provided below and understands design with clearer.
Embodiment two
This patent proposes the design optimization method and the final optimization leaf with scour hole of a kind of centrifugal heart impeller of pump
Wheel form, with reference to the Osima jacoti, Osima excavata index of blood haemolysis, fluid (is calculated by CFD in impeller hydraulic model design optimization
Mechanics) means, by the accurate seizure to heart pump internal flow boundary shear stress with assessing, realize impeller waterpower molded line
Optimization design, the on this basis technology such as bond material, coating, it is ensured that the physiological compatibility index of heart pump.Illustrate
It is as follows：
First, initial the Hydraulic Design
1) selection of specific speed
Known left ventricle pump design parameter：
Flow：Q=5L/min=0.3m/h, lift：H=2.5mH2O, rotating speed：N=5000r/min.
Calculate the specific speed of pump：
It is determined that the heart pump of design belongs to the category of centrifugal low specific speed pump, blade shape is plain vane.
2) efficiency of pump is calculated
A) hydraulic efficiency
B) volumetric efficiency
C) mechanical efficiency
D) gross efficiency
η=ηhηmηv=0.7835 × 0.9657 × 0.9210=0.6969
3) shaft power and prime mover selection
The shaft power of pump：
Pump uses magnetically-actuated, if ηt=1, safety coefficient KgTake 1.2.
Original machine power：
pg=Kgp/ηt=1.2 × 2.93=3.52 (W)
Assuming that pump inlet flow velocity vs=1.1m/s, then pump inlet diameter
Pump discharge diameter Dd=Ds, pump inlet speed：
Pump discharge speed
Vd=Vs=1.06m/s
5) calculating and determination of pump main geometric parameters
A) impeller inlet diameter Dj
Take COEFFICIENT K0=3.6, then impeller inlet equivalent diameter
Impeller inlet diameter：
The specific speed of pump is relatively low, takes coefficient k1=0.9, then diameter D at vane inlet1=k1Dj=9mm.
B) impeller outlet width b2Calculating
C) impeller outlet diameter D2Primary Calculation
6) drafting of impeller flow channel of axial plane and blade
The physical dimension calculated more than, preliminary flow channel of axial plane is first gone out with appropriate straight line, arc drafting, so
Cross-section of river runner inspection, the cross-section of river change curve monotone increasing (Fig. 1) of runner, and smoother, base are carried out to it afterwards
Requirement of this satisfaction to efficiency and cavitation, it is possible to primarily determine that flow channel of axial plane shape (Fig. 2).
When flowing progress runner to axial plane, because the specific speed of designed pump is smaller, so need to only make in one
Between streamline.Intermediate distributary line is first drawn, it is equal in the area of passage for calculating the tangent inscribed circle that shunt line two is surveyed, so as to
The position of intermediate distributary line is determined, flow channel of axial plane divides Fig. 3.
7) selection and calculating of inlet side blade angle
Such as Fig. 4, inlet blade angle is generally taken to be more than fluid flow angle, i.e. β1>β′1.High incidence Δ β is formed in impeller inlet：Δβ
=β1-β′1。
It is normal direction import to be located at impeller inlet, then vu1a=0.
Peripheral speed at vane inlet is：
Axis plane velocity at vane inlet is：
Wherein：
Wherein, D is diameter, and λ is flow angle, and δ is vane thickness, and subscript 1 represents import, and a is a points in Fig. 4 (a)
Assuming that porch vane thickness is 0.5mm, λ1=90 °.Take Δ β1i=3 °.Inlet side blade is calculated with table 1 to lay
Angle.
The entrance edge of blade laying angle computational chart of table 1
Take：β1a=25 °, β1b=28 °, β1c=35 °.
8) meridian streamline branch and picture streamline grid
Consideration in terms of for processing, need to be by a Streamline Design blade profile using two-dimentional blade, therefore only.Below according to
Center line of flow path is designed, such as Fig. 5.
After each streamline carries out branch in flow channel of axial plane, you can streamline corresponding to being drawn in grid.Meet first each
The blade angle of streamline entrance, determine entrance edge of blade with the intersection point of each streamline in grid further according to streamline branch figure
On position.Subtended angle of blade is adjusted, makes the inlet angle of center line of flow path, the intersection point of angle of outlet extended line to inlet and outlet side starting point
Length it is roughly equal.Such as Fig. 6, subtended angle of blade takes 106 °.
9) thickening vanes and blade form drawing
Because blade is the two-dimensional circle Cylindrical Blade that designs by back shroud, therefore only need to be thickeied between two plates respectively
(such as Fig. 7), in order to reduce excretion coefficient, the processing of its vane inlet thickness is reduced, final impeller blade thickness minimum thickness takes
0.5mm, maximum gauge take 1mm.It is final to obtain blade form drawing (such as Fig. 8).
2nd, the heart impeller of pump hydraulic optimization based on haemolysis shearing rate index
1) full runner hydraulic model modeling
Using the designed two-dimentional hydraulic model figure of upper one section, i.e. Fig. 7, Fig. 8, three-dimensional full runner is carried out to the runner of pump
Modeling, wherein in order to provide computational efficiency, first ignores back shroud interstitial fluid domain.Using UG graphic plotting heart pump runners
Three-dimensional basin figure, drawing area includes entrance, impeller, spiral case and outlet section.Inlet tube inlet diameter takes 10mm, its
Length is about 10 times of impeller inlet diameter.Impeller saves processing cost and improves machining accuracy, adopt for the ease of processing
With half-opened impeller, on the premise of Impeller Machining precision and assembly precision are attained by, the gap of blade tip takes 0.2mm.
Such as Fig. 9, Figure 10.
2) mesh generation
Mesh generation is carried out using the ICEM under ANSYS softwares.In order to save the time and improve computational accuracy, water inlet pipe,
Outlet pipe and pumping chamber use hexahedral mesh, and impeller uses tetrahedral grid, and to blade-tip clearance, pumping chamber cut water
It is encrypted Deng region, to simulate the flow performance at these details, each basin number of grid and quality are as shown in table 2.
Each basin number of grid of table 2 and quality
3) grid independence is verified
Because the quantity of grid, size have a great influence to the result of simulation, suitable number of grid can be largely
The accuracy of result of calculation is improved, but number of grid is excessive and can cause the waste of computer resource.Therefore need to pass through difference
Grid number carry out the checking of the independence of grid, employ 6 kinds of same flow rate working conditions of different grid numbers progress in this calculatings
Lower progress Three Dimensional Steady calculating, lift, efficiency, the shearing stress curve of the pump drawn are as shown in figure 11.
As seen from Figure 11, with number of grid from 200 ten thousand to 400 ten thousand, lift and efficiency become from 1.83m, 53% respectively
For 1.89m, 54.9%, change 3.3%, 3.6% respectively, variable quantity very little.Because the external characteristics of pump is to number of grid
Less demanding, 2,000,000 grids have reached calculating and have required that, so being further added by grid, external characteristics is almost unchanged.But different nets
Maximum shear stress changes greatly under lattice number, when grid number is 3,500,000, continues to increase grid, maximum shear stress change is little, opens
Begin stable in 870Pa or so.Consider computational accuracy and calculate cost, finally use grid sum for 3,500,000 grid
Calculated.
4) boundary condition and turbulence model
When carrying out numerical simulation, the physical parameter of fluid presses the parameter setting of blood：Density is set to 1050kg/m, glues
Degree coefficient is 0.005Pa s, rotating speed 5000r/min, flow rate working conditions 5L/min.Using speed import and pressure export
Boundary condition, and outlet pressure is set as 20000Pa；The hydraulic model region of impeller is arranged to Multiple Reference
Frame models；The coupling of pressure and speed employs SIMPLEC algorithms；Convective term and pressure gradient term use Second-order Up-wind
Difference scheme；The full flow passage area of pump is simulated using SST k- ω turbulence models.
5) result of calculation is analyzed
A) hydraulic performance of pump
Centrifugal pump inlet and outlet total pressure head is considered as the lift of pump, and the efficiency eta of pump calculates as follows.
Wherein, g represents acceleration of gravity, and H [m] represents lift, Q [m3/ h] represent flow, MtFor moment of torsion, n [rpm] is to turn
Speed.
The lift H=1.90m of above-mentioned centrifugal pump, η=52.4%.
B) impeller streamline distribution
As can be seen that impeller internal overall flow general trend is good from velocity profile figure Figure 12 of impeller, blood phase
Maximum is reached in exit to speed.But there is the low of part in the suction surface and inlet side pressure face of exit edge of blade
Also there is part flow separation phenomenon in fast area, the pressure face of inlet side.If blood is long in the region residence time, can
Can cause the formation of thrombus, and shearing stress action time it is long also result in red blood cell rupture, produce haemolysis.
From the three-dimensional motion pattern (Figure 13) of impeller as can be seen that due to the presence of impeller tip clearance, in blade pressure
There is pressure differential in face, fluid can be flowed to suction surface from pressure face, crossfire occurred and showed by tip clearance between blade with suction surface
As causing to disturb to flow of fluid near suction surface, so as to which the loss of energy occur.Gap is bigger, and energy loss is more, so
In the case that assembly precision allows, tip clearance is reduced as far as possible, in the research of this project, tip clearance is positively retained at 0.2mm.
C) shearing force size
The maximum shear stress of the pump is 1513Pa, and the destruction to blood is larger.But the overall wall shearing of pump from Figure 14
Stress analysis, the shear stress values for having 82% wall area are less than 250pa, and the ratio more than 1000pa regions is almost
0, but although ratio very little shared by it, but because more than 1000Pa shearing stress can cause red blood cell moment to rupture, so
Their effect is still very important.Analyze wall shear stress as shown in figure 15 again to understand, the larger place of shearing stress is main
Concentrate on entrance edge of blade nearby, blade pressure surface outlet side nearby and vane nose gap location, this is probably because blood is firm
During into impeller, inlet side is bumped against, caused by velocity variations gradient is big, same exit is nearby that sound basin crosses
Face, velocity gradient change is also larger, and it is bigger than normal to cause shear stress.Shearing stress at blade gaps is excessive to be also due to speed
Gradient is excessive, because blade is rotated at a high speed with 5000rpm rotating speed, and the another side in gap is quiet wall, herein on blade
End face speed has a great influence to the fluid velocity of gap location, and shear stress is relatively large.
D) improvement project
Flow passage components to the heart pump of Preliminary design more than have carried out inner flow velocity in-line analysis, wall is cut
Shear Stress Distribution is understood, it is necessary to optimize processing to the inlet and outlet of impeller blade.
6) pump is tentatively optimized
A) hydraulic model modeling and grid division
The three-dimensional modeling for optimizing rear blade is as shown in figure 16.
B) result of calculation analysis is optimized
Centrifugal heart pump maximum shear stress after optimization is 851Pa, much smaller than the 1513Pa before optimization, shearing stress feelings
Condition, which has, to be obviously improved, and eliminates more than 1000Pa high shearing stress area.Difference is not before the overall distribution of shearing stress and optimization
Greatly, but the shearing stress of blade import and export is obviously reduced.Heart it can be seen from shear Stress Distribution figure as shown in figure 17
The percentage of Low shear stress (being less than 250Pa) does not have obvious change in pump, is still 82% or so.Medium stress value area
The ratio of (250~500Pa) has small lifting, about rises 3%, and under the region of high stress (being higher than 500Pa) proportion
Depreciation is approximately equal to the rising value of medium stress value area percentage.Data above illustrates that above-mentioned optimization is to local in heart pump
High shearing stress improves substantially, and the maximum shear stress of left ventricle pump significantly reduces.But the region of medium shearing stress not due to
On Optimized Measures and reduce shearing stress, or range of decrease very little, local high shear stress improves obvious.
3rd, impeller washes away hole optimization
In the research of this project, the impeller size of the blood pump of designed research is smaller, when impeller can produce when rotated
Axial thrust, it may make impeller that axial float, so as to cause the change in size in wheel nose gap, performance unstable, institute occur
So that hole must be added on impeller with balancing axial thrust.In addition, impeller perforate also has the blood for washing away the delay of back shroud gap location to make
With so as to avoid thrombus generation.Structure such as Figure 18 after impeller perforate：
1) modeling and grid division
In order to understand fully mechanism of the impeller perforate to gap flowing between back shroud and pump case, three kinds of different number of aperture are contrasted
Impeller internal flow behavior and hydraulic performance during mesh, in the case where ensureing that impeller geometric parameter is constant, respectively with symmetrical side
Formula arranges 2 (Figure 19) and 4 (Figure 19) holes, aperture 2mm.
The geometrical model of pump is as shown in figure 20 after perforate.
The computational fields of hydraulic model are broadly divided into 5 parts：Inlet tube, impeller, hole, pumping chamber and back shroud of impeller with
Gap between pump case.
Grid is combined using tetrahedron and hexahedral mesh, and wherein impeller basin uses tetrahedral grid, remaining basin
Use hexahedral mesh.For impeller behind gap and calculating simulation research object of the hole as emphasis is washed away, to its region
Mesh refinement processing is carried out, total grid number of full flow passage area is 5,800,000.
2) result and analysis
The comparative analysis that three impellers are carried out with hydraulic performance in flow rate working conditions point 5L/min is as shown in table 3.
The hydraulic performance of the impeller of table 3
As seen from the table, the hydraulic performance with non-porous impeller contrasts, the lift of pump reduces when impeller is with holes, efficiency declines,
Axial force reduces.In terms of the result of simulation, the lift of pump is satisfied by design requirement when impeller opens 2 or 4 holes, and 4 hole impellers
Situation of the efficiency only than 2 hole impellers is low by 1.5%, illustrates that the influence of how many pairs of hydraulic efficiencies of number of perforations is little.But 4 hole leaves
The axial thrust of wheel is reduced to the 1/2 of non-porous impeller, and this considerably increases the degree of safety of bearing operation.Analyzed by hydraulic performance
Understand, it is suitable to select 4 holes when processing impeller.
Section B velocity field is as shown in figure 21 in gap runner between back shroud of impeller and pump case, (a), (b), (c)
2 holes, 4 holes and non-porous flow field figure are respectively carried, is as a result shown, when with holes, blood can pass through hole by the behind gap of impeller
Impeller inlet is flow back into, this flow faster radial velocity of the blood in impeller behind gap, blood is quickly flowed out leaf
The behind gap of wheel, stopped without excessive here, avoid the formation of thrombus.And the vane pump model impeller bonnet without balance pipe
Though flowing is smooth at sheet separation, speed is very low, and blood flowing speed is slower, there is thrombosed possibility.During 4 hole impeller
Radial velocity be greater than the radial velocity in 2 holes, blood can be outside faster efflux pump.
Impeller internal section A velocity field is as shown in figure 22.(a), (b), (c) are respectively 2,4 holes of band and non-porous
Relative velocity motion pattern.Impeller with holes, its internal flow velocity gradient near hole is larger, with non-porous impeller internal stream
Field speed degree gradient comparison, it is known that by the flow in hole flow field velocity near hole can be caused to become big, the speed of blade suction surface increases
Greatly, the change that the flow field velocity near 4 holes changes than 2 becomes apparent from.
Wall shear stress map analysis from Figure 23 back shroud of impeller gap, shear stress have local increasing around hole
Greatly, 2 holes of band are identical with the stress variation value rule in 4 holes.In addition, regardless of whether perforate, the shear stress of impeller outer edge do not have
Change significantly.
3) conclusion
A) compared with non-porous impeller, the speed of perforate back shroud of impeller gap location flow of fluid accelerates, but pump simultaneously
Hydraulic efficiency reduces.Influence of the number of openings change to impeller hydraulic efficiency is little, but is significantly reduced axial thrust, and this is right
Made great sense in the axial float for reducing rotor.
B) after impeller perforate, the fluid-flow rate increase in the gap runner between back shroud of impeller and pump case, favorably
In gap location smooth fluid by impeller behind gap, this greatly reduces thrombosed possibility.
C) the wall shear stress near hole has increased near the small range of hole, but smaller to scope, impeller outer edge
Shear stress change is little.
By the perforate on impeller, heart pump haemolysis can be reduced and produce the possibility of thrombus.So set by reply
The blood impeller of pump of meter carries out perforate design.
Impeller embodiment
As shown in figure 24, this embodiment offers a kind of impeller, the impeller is by heart pump Impeller Design as described above
Method is designed and gone out, including wheel base 1 and blade 2, and balance pipe 3 is offered vertically on the wheel base 1.
The impeller designed according to the above method, meet haemolysis physical signs, be not likely to produce thrombus.
Finally it should be noted that：Various embodiments above is merely illustrative of the technical solution of the present invention, rather than its limitations；
Although the present invention is described in detail with reference to foregoing embodiments, it will be understood by those within the art that：Its
The technical scheme described in foregoing embodiments can still be modified, it is either special to which part or whole technologies
Sign carries out equivalent substitution；And these modifications or replacement, the essence of appropriate technical solution is departed from each implementation of the present invention
The scope of example technical scheme.
Claims (10)
1. a kind of heart pump method for designing impeller, it is characterised in that comprise the following steps：
Step 1, blade shape is determined by the specific speed for calculating pump；
Step 2, calculate the efficiency of pump；
Step 3, calculate the shaft power and original machine power of pump；
Step 4, determine the inlet diameter of pump, outlet diameter, inlet velocity, muzzle velocity；
Step 5, determine that impeller inlet diameter, vane inlet go out diameter, impeller outlet width and impeller outlet diameter；
Step 6, the size calculated according to step 2 into step 4, preliminary flow channel of axial plane is drawn out, and then determine axial plane stream
Road shape；
Step 7, selection and calculating inlet side blade angle；
Step 8, to meridian streamline branch and draw streamline grid；
Step 9, determine thickening vanes figure and blade form drawing；
Step 10, the heart impeller of pump hydraulic optimization based on haemolysis shearing rate index；
Step 11, the effect of optimization based on step 10, carry out the optimization of impeller ability scour hole.
2. heart pump method for designing impeller according to claim 1, it is characterised in that in step 1, the specific speed meter of pump
Calculating formula isWherein Q is flow, and H is lift, and n is rotating speed.
3. heart pump method for designing impeller according to claim 2, it is characterised in that in step 2, first calculate pump
Hydraulic efficiency
Volumetric efficiency
Mechanical efficiencyFinally calculate
Gross efficiency η=ηhηmηv。
4. heart pump method for designing impeller according to claim 3, it is characterised in that in step 3, the shaft horsepower meter of pump
Calculating formula is
Original machine power calculation formula is pg=Kgp/ηt, wherein KgFor safety coefficient, ηtFor prime mover efficiency.
5. heart pump method for designing impeller according to claim 4, it is characterised in that in step 4, the inlet diameter of pump
ForThe outlet diameter D of pumpd=Ds, the inlet velocity of pumpThe muzzle velocity V of pumpd=Vs, wherein,
VsFor the inlet velocity of pump.
6. heart pump method for designing impeller according to claim 5, it is characterised in that in step 6, arrived according to step 2
The size calculated in step 4, preliminary flow channel of axial plane is first drawn out, cross-section of river runner inspection is then carried out to it, according to mistake
The result of water section runner inspection determines flow channel of axial plane shape.
7. heart pump method for designing impeller according to claim 1, it is characterised in that in step 10, flowed entirely first
Road hydraulic model modeling, then carries out mesh generation, then carries out grid independence checking, finally carries out result of calculation analysis and determines
Improvement project simultaneously tentatively optimizes.
8. heart pump method for designing impeller according to claim 7, it is characterised in that be modeled, used using UG
ICEM under ANSYS softwares carries out mesh generation.
9. heart pump method for designing impeller according to claim 1, it is characterised in that in step 11, enter water-filling first
Power model modeling and mesh generation, then carry out interpretation of result.
10. a kind of impeller, it is characterised in that the impeller is as the heart pump Impeller Design as described in claim any one of 1-9
Method is designed and gone out, including wheel base and blade, and balance pipe is offered vertically on the wheel base.
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