CN101822855A - Serial cascade stator structure of artificial heart blood pump - Google Patents

Abstract

Translated fromChinese

本发明涉及一种人工心脏血液泵的串列叶栅静子结构，该串列叶栅静子结构包括扩张式轮毂流道及其静子叶片；所述的扩张式轮毂流道采用了流线型的三次样条曲线流道，所述的静子叶片部分由5片前排叶片和5片后排叶片组成，后排叶片前缘与前排叶片尾缘之间留有一定间隙；所述的静子叶片的前后排叶片在周向位置结构方面：后排叶片前缘在根部和尖部均位于前排两片叶片之间周向角度的35％位置。本发明的结构设计不仅能够具有较高的供血压升能力，而且能够获得较好的流场分布，提高血液泵的抗溶血性能，满足其在将来短期或者长期植入心力衰竭患者体内的要求。

The invention relates to a tandem cascade stator structure of an artificial heart blood pump. The tandem cascade stator structure includes an expanded hub flow channel and its stator blades; the expanded hub flow channel adopts a streamlined cubic spline Curved flow path, the stator blade part is composed of 5 front row blades and 5 rear row blades, and there is a certain gap between the leading edge of the rear row blades and the trailing edge of the front row blades; the front and rear rows of the stator blades In terms of the circumferential position and structure of the blades: the leading edge of the rear row of blades is located at 35% of the circumferential angle between the two front row blades at the root and tip. The structural design of the present invention can not only have a higher ability to raise blood pressure, but also can obtain better flow field distribution, improve the anti-hemolysis performance of the blood pump, and meet the requirements of short-term or long-term implantation in heart failure patients in the future.

Description

The serial cascade stator structure of artificial heart blood pump

Technical field

The present invention relates to a kind of serial cascade stator structure of artificial heart blood pump, belong to the technical field of comprehensive turbomachine technology and Medical Technology.

Background technology

Heart failure is the late stage of various heart disease development, is directly threatening increasing patient's life.The method of treatment heart failure mainly contains at present: Drug therapy, surgical operation, mechanical assistance circulation, heart transplantation, cell transplantation etc.Drug therapy has accounted for the overwhelming majority wherein, but heavier when the state of an illness, or even cardiac function forfeiture time, just must take heart transplantation to give treatment to.Yet the Therapeutic Method of heart transplantation has bigger limitation, mainly is because the healthy heart quantity that is used to transplant seldom and be difficult in time obtain, and may produce rejection and opportunistic infection after the operation.So artificial mechanical blood pump, that is: artificial heart has very big demand.

Artificial mechanical blood pump is divided into according to working mechanism and the different of structure: the vane type blood pump of pulsating blood pump and rotary Continuous Flow.With respect to the pulsating blood pump, that the vane type blood pump of rotary Continuous Flow has is simple in structure, be easy to make, need not to install advantage such as artificial valve.The vane type blood pump is further divided into vane type axial flow blood pump, propeller type centrofugal blood pump and vane type mixed flow blood pump again.Vane type axial flow blood pump is compared the propeller type centrofugal blood pump, has that volume is little, priming volume is little, to advantages such as the blood destructiveness are light, and is more suitable for implant into body.

In the design of vane type axial flow blood pump, not only to consider to satisfy the blood supply voltage rise demand of human body fundamental need, and to consider the anti-hemolysis performance of blood pump, the conveying of oxygen is finished by erythrocyte in the blood circulation process, excessive shearing stress can make the cell membrane of erythrocyte tear, intracellular hemoglobin is free in blood plasma, causes the oxygen carrying capacity forfeiture of erythrocyte, so-called haemolysis that Here it is.A large amount of haemolysis can cause sanguimotor oxygen exchange capacity to decline to a great extent, and causes anemia, the serious entail dangers to life of going back.Cause hemolytic factor to have a lot, but intrinsic reason is the dynamic behavior of blood.Existing studies show that, haemolysis appear in the blood flow that does not meet physiological requirement, as turbulent flow, and eddy current, shearing force district etc.Can the haemolysis quality be successfully applied to the clinical crucial effects that all has for blood pump.

Vane type axial flow blood pump mainly partly is made up of stator part, rotor portion and stator, and wherein the stator part has not only played the effect of rectification blood Way out, and certain effect has been played in the voltage rise that improves blood.In blood flow in the process of blood pump, blood has higher speed and deflection angle after rotor flows out, stator is in the face of abominable condition for import like this, bad flow phenomenons such as eddy current and backflow very easily appear, and then initiation haemolysis problem, this point confirms by numerical simulation result and blood pump zoopery result, so the design quality of stator has very big influence to the anti-hemolysis performance of blood pump.Therefore it is essential to say that structure advanced person, stator reasonable in design can be successfully applied to the clinical artificial heart blood pump one.

The tandem cascade technology that is applied at the axial flow compressor or the centrifugal compressor parts of aero-engine can play inhibition, postpone the isolating effect of flowing, especially under the bigger situation of fluid deflection, effect is more obvious, and it uses efficient and the performance that has improved compressor effectively.In the stator design of vane type axial flow blood pump, so far but not based on the tandem cascade structure Design, substantially all be single general stator structure design, even the outlet of the blood pump behind stator position adds row's blade again, purpose also mainly is further to lead flowing of straight blood outlet, plays the effect of rear guide vane.The blood pump stator of general structure partly adopts row's blade to bear bigger blood flow turning angle, the defective of this structure is by the stator part, the blood flow of the high speed of rotor outlet, large deflection angle is transferred in the process of axial flow stably, have angular deflection near 70 °-80 °, thereby separation problems such as eddy current, refluence very easily appear, thereby can cause the haemolysis problem, have influence on the anti-hemolysis performance of blood pump.

Summary of the invention

The object of the present invention is to provide a kind of serial cascade stator structure of artificial heart blood pump, shown in Fig. 1 b, the tandem cascade structure that five stator blades of general blood pump stator structure design is divided into row's blade behind five front-seat blades and five, runner section has adopted fairshaped cubic spline curve, and the blade tip diameter of two kinds of structures is 12.7mm among the figure.Purpose of design is to make stator part not only can have higher blood supply voltage rise ability, and can obtain Flow Field Distribution preferably, improves the anti-hemolysis performance of blood pump, satisfies it in short-term or implant the intravital requirement of heart failure patient for a long time in future.

Technical scheme of the present invention mainly comprise following some:

A kind of serial cascade stator structure of artificial heart blood pump is characterized in that: this serial cascade stator structure comprises stator wheel hub runner and stator blade thereof:

1, stator wheel hub runner has adopted fairshaped cubic spline curve runner, shown in Fig. 4 a label 8.This streamline channel has prevented the sudden expansion of pressure, help suppressing mobile separation in the stator blade district, the streamlined stator wheel hub of cubic spline axial range is shown in Fig. 4 alabel 13, this cubic spline curve interpolation point meridian coordinate is as follows, abscissa is the interpolation knot axial coordinate, vertical coordinate is an interpolation knot in the exhibition of vertical axial to the direction coordinate, and unit is m:

(0.01250，0.00525)，(0.01358，0.00525)，(0.01500，0.00522)，(0.01787，0.00512)，(0.01969，0.00504)，(0.02176，0.00488)，(0.02387，0.00463)，(0.02679，0.00399)，(0.02887，0.00324)，(0.03073，0.00246)，(0.03207，0.00202)，(0.03230，0.00200)；

2, stator blade part is made up of row'sblade 3 behind five front-seat blades 2 and five, leave certain interval between back row'sblade inlet edge 11 and the front-seatblade trailing edge 10, on meridian and cascade structure view (Fig. 4 a, b), indicated each blade parameter implication, front-seatblade inlet edge 9 and front-seatblade trailing edge 10 are respectively 5.25mm and 5.07mm at the radius of front-seat root ofblade 4, and front-seatblade inlet edge 9 and front-seatblade trailing edge 10 are 6.35mm at the radius of front-seat blade tip 6; Back row'sblade inlet edge 11 and back row'sblade trailing edge 12 are respectively 5.06mm and 4.43mm at the radius of back row's root ofblade 5, and back row'sblade inlet edge 11 and back row'sblade trailing edge 12 are 6.35mm at the radius of back row's blade tip 7.Front-seatblade inlet edge 9 and front-seatblade trailing edge 10 are in the leading edge blade angles of front-seat root ofblade 4₁With the trailing edge blade angles₂Be respectively-70.20 ° and-18.70 °, front-seatblade inlet edge 9 and front-seatblade trailing edge 10 are in the leading edge blade angles of front-seat blade tip 6₁With the trailing edge blade angles₂Be respectively-60.3 ° and-31.2 °; Back row'sblade inlet edge 11 and back row'sblade trailing edge 12 are in the leading edge blade angles of back row's root ofblade 5₁With the trailing edge blade angles₂Be respectively-39.1 ° and 11.5 °, back row'sblade inlet edge 11 and back row'sblade trailing edge 12 are in the leading edge blade angles of back row'sblade tip 7₁With the trailing edge blade angles₂Be respectively-30.3 ° and 8.9 °.Front-seat blade angle β_yAt front-seat root ofblade 4 is-47.7 °, is-48.8 ° in front-seat blade tip 6; Back row's blade angle β_yRow's root ofblade 5 is-13.7 ° in the back, and row'sblade tip 7 is-10.6 ° in the back.The axial length of front-seat root ofblade 4 is 6.48mm, and the axial length of front-seat blade tip 6 is 6.28mm; The axial length of back row's root ofblade 5 is 5.74mm, and the axial length of back row'sblade tip 7 is 5.74mm.Forward and backward row's blade parameter value can be referring to table 1.The definition of angle direction with the relative blood pump of this angle direction axially (from the stator importer to pointing to Way out) be the dextrorotation veer for just.

Table 1. serial cascade stator front and rear row blade geometry parameter

Front-seat root of blade blade angles_HubDistribute and adopt two sections cubic spline curve matches to obtain respectively, the meridian axial length value that abscissa is is benchmark with front-seat blade inlet edge point, unit is m; Vertical coordinate is the root blade angles_HubValue, unit is °.At front-seat root of blade: the interpolation knot coordinate of first section cubic spline curve is: (0.00000 ,-70.7), (0.00046 ,-67.2), (0.00092 ,-64.0), (0.00137 ,-59.1); The interpolation knot coordinate of second section cubic spline curve is: (0.00137 ,-59.1), (0.00309 ,-42.2), (0.00480 ,-29.3), (0.00648 ,-18.7).Front-seat blade tip blade angles_TipDistribute and adopt two sections cubic spline curve matches to obtain respectively, the meridian axial length value that abscissa is is benchmark with front-seat blade inlet edge point, unit is m; Vertical coordinate is the tip blade angles_TipValue, unit is °.In front-seat blade tip: the interpolation knot coordinate of first section cubic spline curve is: (0.00000 ,-60.5), (0.00044 ,-59.1), (0.00089 ,-57.7), (0.00133 ,-56.5); The interpolation knot coordinate of second section cubic spline curve is: (0.00133 ,-56.5), (0.00298 ,-48.7), (0.00463 ,-40.7), (0.00628 ,-31.3).

Back row's root of blade blade angles_HubWith the tip blade angles_TipDistribute and adopt the cubic spline curve match to obtain, the meridian axial length value that abscissa is is benchmark with front-seat blade inlet edge point, unit is m; Vertical coordinate is respectively the root blade angles_HubWith the tip blade angles_Tip, unit is °.Arrange root of blade in the back: the interpolation knot coordinate of cubic spline curve is: (0.00676 ,-39.1), (0.00876 ,-20.0), (0.01070 ,-3.7), (0.01254,12.1).Arrange blade tip in the back: the interpolation knot coordinate of cubic spline curve is: (0.00676 ,-30.3), (0.00867 ,-16.5), (0.01059 ,-3.7), (0.01250,9.4).

The stator blade thickness of the present invention also blood pump stator blade than general is thinner, and the stator thickness here is with the vertical dimension definition of blade profile surface point to mean camber line.Stator blade thickness in the general structure is 0.4mm～2.0mm, and front and rear row stator blade thickness is in the structure of the present invention: 0.50mm～0.76mm.The thickness distribution of front-seat blade and back row's blade all adopts the cubic spline curve match to obtain.Abscissa is to be the meridian axial length value of benchmark with the leading edge point, and unit is m; Vertical coordinate is for adopting the vane thickness of blade profile surface point to the vertical dimension definition of mean camber line, and unit is m.Front-seat root of blade interpolation knot coordinate is: (0.00000,0.00055), (0.00087,0.00062), (0.00231,0.00070), (0.00407,0.00069), (0.00549,0.00063), (0.00649,0.00056); Front-seat blade tip interpolation knot coordinate is: (0.00000,0.00060), (0.00138,0.00070), (0.00283,0.00076), (0.00471,0.00072), (0.00628,0.00060).Back row's root of blade interpolation knot coordinate is: (0.00675,0.00048), (0.00804,0.00054), (0.01038,0.00058), (0.01150,0.00056), (0.01256,0.00050); Back row's blade tip interpolation knot coordinate is: (0.00674,0.00052), (0.00854,0.00058), (0.01008,0.00060), (0.01079,0.00059), (0.01250,0.00052).

3, the front and rear row blade of stator blade is in the circumferential position configuration aspects: back row's blade inlet edge is equal circumferential 35% positions of angle between front-seat two blades in root and tip, because wheel hub is a surface of revolution structure, be reflected on the unfolded TWO-DIMENSIONAL CASCADE structure chart (Fig. 5 a, b): along the surface of revolution arc of vertical axial on direction, back row's blade mean camber line leading edge point to the arc of front-seat blade mean camber line extended line to length L₁The arc that accounts for front-seat blade two adjacent blade mean camber lines is 35% to the ratio of distance L: i.e. L₁/ L=0.35 (L₁Be on the same meridian axial location with L, calculate L₁The time get the adjacent back row's blade of pressure face front-seat blade be benchmark).

The present invention is a kind of serial cascade stator structure of artificial heart blood pump, its advantage and effect are: the tandem cascade structure that 5 stator blades of general structural design is divided into front-seat 5 blades and 5 blades of back row designs respectively, stator wheel hub runner in the present invention's design has adopted the streamlined curve of slick cubic spline simultaneously, the wheel hub runner adopts mild interim form, especially in the stator blade district, the expansion of runner is more releived; Structural design of the present invention not only can have higher blood supply voltage rise ability, and can obtain Flow Field Distribution preferably, improves the anti-hemolysis performance of blood pump, satisfies it in short-term or implant the intravital requirement of heart failure patient for a long time in future.

Description of drawings

Fig. 1 a is depicted as the schematic three dimensional views of single stator blade in the prior art

Fig. 1 b is depicted as serial cascade stator structure schematic three dimensional views of the present invention

Fig. 2 a is depicted as prior art and stator part voltage rise of the present invention-rating curve contrast sketch map

Fig. 2 b is depicted as prior art and stator part total pressure recovery coefficient of the present invention-rating curve contrast sketch map

Fig. 3 a1 is depicted as 10% exhibition in prior art stator blade district to the high flow field sketch map of leaf

Fig. 3 a2 is depicted as 50% exhibition in prior art stator blade district to the high flow field sketch map of leaf

Fig. 3 b1 is depicted as 10% exhibition in stator blade of the present invention district to the high flow field sketch map of leaf

Fig. 3 b2 is depicted as 50% exhibition in stator blade of the present invention district to the high flow field sketch map of leaf

Fig. 4 a is depicted as the meridian structure two-dimensional representation of stator part of the present invention

Fig. 4 b is depicted as the TWO-DIMENSIONAL CASCADE channel design sketch map of stator part of the present invention

Fig. 5 a is depicted as the TWO-DIMENSIONAL CASCADE passage root structure sketch map of stator part of the present invention

Fig. 5 b is depicted as the TWO-DIMENSIONAL CASCADE passage tip configuration sketch map of stator part of the present invention

Concrete label and symbol are as follows among the figure:

1: stator blade; 2: front-seat blade; 3: back row's blade; 4: front-seat root of blade; 5: back row's root of blade;

6: front-seat blade tip; 7: back row's blade tip; 8: stator wheel hub runner;

9: front-seat blade inlet edge; 10: front-seat blade trailing edge; 11: back row's blade inlet edge; 12: back row's blade trailing edge;

13: the streamlined stator wheel hub of cubic spline axial range;

β_y: established angle (string of a musical instrument and axial angle, to axial for clockwise direction for just);

β₁: the leading edge blade angle (mean camber line is at leading edge point tangent line and axial angle, to axial for clockwise direction for just);

β₂: the trailing edge blade angle (mean camber line is at trailing edge point tangent line and axial angle, to axial for clockwise direction for just);

β_Hub: the root of blade blade angle (the root of blade mean camber line is at this tangent line and axial angle, to axial for clockwise direction for just);

β_Tip: the blade tip blade angle (the blade tip mean camber line is at this tangent line and axial angle, to axial for clockwise direction for just);

L₁: along the surface of revolution arc of vertical axial on direction, back row's blade mean camber line leading edge point to the arc of front-seat blade mean camber line extended line to length; L: on direction, the arc of front-seat blade two adjacent blade mean camber lines (is annotated: L to distance along the surface of revolution arc of vertical axial₁Be in same axial location with L, calculate L₁The time get the adjacent back row's blade of pressure face front-seat blade be benchmark).

The specific embodiment

Below in conjunction with drawings and Examples technical scheme of the present invention is described further.

A kind of serial cascade stator structure of artificial heart blood pump is characterized in that: this serial cascade stator structure comprises stator wheel hub runner and stator blade thereof

1, stator wheel hub runner has adopted fairshaped cubic spline curve runner, shown in Fig. 4 a label 8.This streamline channel has prevented the sudden expansion of pressure, help suppressing mobile separation in the stator blade district, the streamlined stator wheel hub of cubic spline axial range is shown in Fig. 4 alabel 13, this cubic spline curve interpolation point meridian coordinate is as follows, abscissa is the interpolation knot axial coordinate, vertical coordinate is an interpolation knot in the exhibition of vertical axial to the direction coordinate, and unit is m:

(0.01250，0.00525)，(0.01358，0.00525)，(0.01500，0.00522)，(0.01787，0.00512)，(0.01969，0.00504)，(0.02176，0.00488)，(0.02387，0.00463)，(0.02679，0.00399)，(0.02887，0.00324)，(0.03073，0.00246)，(0.03207，0.00202)，(0.03230，0.00200)；

2, stator blade part is made up of row'sblade 3 behind five front-seat blades 2 and five, leave certain interval between back row'sblade inlet edge 11 and the front-seatblade trailing edge 10, on meridian and cascade structure view (Fig. 4 a, b), indicated each blade parameter implication, front-seatblade inlet edge 9 and front-seatblade trailing edge 10 are respectively 5.25mm and 5.07mm at the radius of front-seat root ofblade 4, and front-seatblade inlet edge 9 and front-seatblade trailing edge 10 are 6.35mm at the radius of front-seat blade tip 6; Back row'sblade inlet edge 11 and back row'sblade trailing edge 12 are respectively 5.06mm and 4.43mm at the radius of back row's root ofblade 5, and back row'sblade inlet edge 11 and back row'sblade trailing edge 12 are 6.35mm at the radius of back row's blade tip 7.Front-seatblade inlet edge 9 and front-seatblade trailing edge 10 are in the leading edge blade angles of front-seat root ofblade 4₁With the trailing edge blade angles₂Be respectively-70.20 ° and-18.70 °, front-seatblade inlet edge 9 and front-seatblade trailing edge 10 are in the leading edge blade angles of front-seat blade tip 6₁With the trailing edge blade angles₂Be respectively-60.3 ° and-31.2 °; Back row'sblade inlet edge 11 and back row'sblade trailing edge 12 are in the leading edge blade angles of back row's root ofblade 5₁With the trailing edge blade angles₂Be respectively-39.1 ° and 11.5 °, back row'sblade inlet edge 11 and back row'sblade trailing edge 12 are in the leading edge blade angles of back row'sblade tip 7₁With the trailing edge blade angles₂Be respectively-30.3 ° and 8.9 °.Front-seat blade angle β_yAt front-seat root ofblade 4 is-47.7 °, is-48.8 ° in front-seat blade tip 6; Back row's blade angle β_yRow's root ofblade 5 is-13.7 ° in the back, and row'sblade tip 7 is-10.6 ° in the back.The axial length of front-seat root ofblade 4 is 6.48mm, and the axial length of front-seat blade tip 6 is 6.28mm; The axial length of back row's root ofblade 5 is 5.74mm, and the axial length of back row'sblade tip 7 is 5.74mm.Forward and backward row's blade parameter value can be referring to table 1.The definition of angle direction with the relative blood pump of this angle direction axially (from the stator importer to pointing to Way out) be the dextrorotation veer for just.

Table 1. serial cascade stator front and rear row blade geometry parameter

Front-seat root of blade blade angles_HubDistribute and adopt two sections cubic spline curve matches to obtain respectively, the meridian axial length value that abscissa is is benchmark with front-seat blade inlet edge point, unit is m; Vertical coordinate is the root blade angles_HubValue, unit is °.At front-seat root of blade: the interpolation knot coordinate of first section cubic spline curve is: (0.00000 ,-70.7), (0.00046 ,-67.2), (0.00092 ,-64.0), (0.00137 ,-59.1); The interpolation knot coordinate of second section cubic spline curve is: (0.00137 ,-59.1), (0.00309 ,-42.2), (0.00480 ,-29.3), (0.00648 ,-18.7).Front-seat blade tip blade angles_TipDistribute and adopt two sections cubic spline curve matches to obtain respectively, the meridian axial length value that abscissa is is benchmark with front-seat blade inlet edge point, unit is m; Vertical coordinate is the tip blade angles_TipValue, unit is °.In front-seat blade tip: the interpolation knot coordinate of first section cubic spline curve is: (0.00000 ,-60.5), (0.00044 ,-59.1), (0.00089 ,-57.7), (0.00133 ,-56.5); The interpolation knot coordinate of second section cubic spline curve is: (0.00133 ,-56.5), (0.00298 ,-48.7), (0.00463 ,-40.7), (0.00628 ,-31.3).

Back row's root of blade blade angles_HubWith the tip blade angles_TipDistribute and adopt the cubic spline curve match to obtain, the meridian axial length value that abscissa is is benchmark with front-seat blade inlet edge point, unit is m; Vertical coordinate is respectively the root blade angles_HubWith the tip blade angles_Tip, unit is °.Arrange root of blade in the back: the interpolation knot coordinate of cubic spline curve is: (0.00676 ,-39.1), (0.00876 ,-20.0), (0.01070 ,-3.7), (0.01254,12.1).Arrange blade tip in the back: the interpolation knot coordinate of cubic spline curve is: (0.00676 ,-30.3), (0.00867 ,-16.5), (0.01059 ,-3.7), (0.01250,9.4).

The thickness distribution of front-seat blade and back row's blade all adopts the cubic spline curve match to obtain.Abscissa is to be the meridian axial length value of benchmark with the leading edge point, and unit is m; Vertical coordinate is for adopting the vane thickness of blade profile surface point to the vertical dimension definition of mean camber line, and unit is m.Front-seat root of blade interpolation knot coordinate is: (0.00000,0.00055), (0.00087,0.00062), (0.00231,0.00070), (0.00407,0.00069), (0.00549,0.00063), (0.00649,0.00056); Front-seat blade tip interpolation knot coordinate is: (0.00000,0.00060), (0.00138,0.00070), (0.00283,0.00076), (0.00471,0.00072), (0.00628,0.00060).Back row's root of blade interpolation knot coordinate is: (0.00675,0.00048), (0.00804,0.00054), (0.01038,0.00058), (0.01150,0.00056), (0.01256,0.00050); Back row's blade tip interpolation knot coordinate is: (0.00674,0.00052), (0.00854,0.00058), (0.01008,0.00060), (0.01079,0.00059), (0.01250,0.00052).

3, the front and rear row blade of stator blade is in the circumferential position configuration aspects: back row's blade inlet edge is equal circumferential 35% positions of angle between front-seat two blades in root and tip, because wheel hub is a surface of revolution structure, be reflected on the unfolded TWO-DIMENSIONAL CASCADE structure chart (Fig. 5 a, b): along the surface of revolution arc of vertical axial on direction, back row's blade mean camber line leading edge point to the arc of front-seat blade mean camber line extended line to length L₁The arc that accounts for front-seat blade two adjacent blade mean camber lines is 35% to the ratio of distance L: i.e. L₁/ L=0.35 (L₁Be on the same meridian axial location with L, calculate L₁The time get the adjacent back row's blade of pressure face front-seat blade be benchmark).

Adopt turbomachine computational fluid dynamics (CFD) numerical simulation software NUMECA (NUMECA company commonly used, Belgium) calculating the back confirms, the boost in pressure ability of stator part improves along with the increase of rotor speed, and this is because stator is pressure potential with blood in the Conversion of energy that rotor portion obtains.In the characteristic line contrast of Fig. 2 a, b, in the prior art, be in when rotor speed under the situation of 12000rpm, the voltage rise performance of the serial cascade stator that it is 11000rpm, 10000rpm and 9000rpm that the voltage rise performance of its general structure stator but is lower than rotor rotating speed of the present invention, especially in volume flow hour, the advantage of boosting of serial cascade stator structure is more obvious.And in most flow region scope, the total pressure recovery coefficient of serial cascade stator all is higher than the total pressure recovery coefficient of general structure stator; Fig. 3 a1, a2 are as seen, can flow backwards and the problem of eddy current to the leaf high position to leaf high position and 50% exhibition in 10% exhibition of general structure stator, and these problems have all obtained effective control after using this serial cascade stator invention structure, shown in Fig. 3 b1, b2.

Claims (2)

Translated fromChinese

1.一种人工心脏血液泵的串列叶栅静子结构，该串列叶栅静子结构包括静子轮毂流道及其静子叶片，其特征在于：1. A tandem cascade stator structure of an artificial heart blood pump, the tandem cascade stator structure includes a stator hub flow channel and stator blades thereof, characterized in that:静子轮毂流道，采用了流线型的三次样条曲线流道，这种流线型流道防止了压力的突扩，有利于在静子叶片区抑制流动的分离，该三次样条曲线插值点子午坐标如下，横坐标为插值节点轴向坐标，纵坐标为插值节点在垂直轴向的展向方向坐标，单位均为m：The flow channel of the stator hub adopts a streamlined cubic spline curve flow channel. This streamlined flow channel prevents the sudden expansion of pressure and is beneficial to suppress the flow separation in the stator blade area. The meridional coordinates of the cubic spline curve interpolation point are as follows, The abscissa is the axial coordinate of the interpolation node, and the ordinate is the span direction coordinate of the interpolation node on the vertical axis, and the unit is m:(0.01250，0.00525)，(0.01358，0.00525)，(0.01500，0.00522)，(0.01787，0.00512)，(0.01969，0.00504)，(0.02176，0.00488)，(0.02387，0.00463)，(0.02679，0.00399)，(0.02887，0.00324)，(0.03073，0.00246)，(0.03207，0.00202)，(0.03230，0.00200)；(0.01250, 0.00555), (0.01358, 0.00525), (0.01500, 0.00522), (0.01787, 0.00512), (0.01969, 0.00504), (0.02176, 0.004888), (0.02679,29999), (0.02679,299), , 0.00324), (0.03073, 0.00246), (0.03207, 0.00202), (0.03230, 0.00200);静子叶片部分由五片前排叶片(2)和五片后排叶片(3)组成，后排叶片前缘(11)与前排叶片尾缘(10)之间留有一定间隙，前排叶片前缘(9)和前排叶片尾缘(10)在前排叶片根部(4)的半径分别为5.25mm和5.07mm，前排叶片前缘(9)和前排叶片尾缘(10)在前排叶片尖部(6)的半径均为6.35mm；后排叶片前缘(11)和后排叶片尾缘(12)在后排叶片根部(5)的半径分别为5.06mm和4.43mm，后排叶片前缘(11)和后排叶片尾缘(12)在后排叶片尖部(7)的半径均为6.35mm；前排叶片前缘(9)和前排叶片尾缘(10)在前排叶片根部(4)的前缘叶片角β₁和尾缘叶片角β₂分别为-70.20°和-18.70°，前排叶片前缘(9)和前排叶片尾缘(10)在前排叶片尖部(6)的前缘叶片角β₁和尾缘叶片角β₂分别为-60.3°和-31.2°；后排叶片前缘(11)和后排叶片尾缘(12)在后排叶片根部(5)的前缘叶片角β₁和尾缘叶片角β₂分别为-39.1°和11.5°，后排叶片前缘(11)和后排叶片尾缘(12)在后排叶片尖部(7)的前缘叶片角β₁和尾缘叶片角β₂分别为-30.3°和8.9°，前排叶片安装角β_y在前排叶片根部(4)为-47.7°，在前排叶片尖部(6)为-48.8°；后排叶片安装角β_y在后排叶片根部(5)为-13.7°，在后排叶片尖部(7)为-10.6°，前排叶片根部(4)的轴向长度为6.48mm，前排叶片尖部(6)的轴向长度为6.28mm；后排叶片根部(5)的轴向长度为5.74mm，后排叶片尖部(7)的轴向长度为5.74mm。The stator blade part is composed of five front row blades (2) and five rear row blades (3). The radii of the leading edge (9) and the front blade trailing edge (10) at the front blade root (4) are 5.25mm and 5.07mm respectively, and the front blade leading edge (9) and the front blade trailing edge (10) are at The radii of the front blade tips (6) are 6.35mm; the radii of the rear blade leading edge (11) and the rear blade trailing edge (12) at the rear blade root (5) are 5.06mm and 4.43mm respectively, The radius of the leading edge (11) of the rear blade and the trailing edge (12) of the rear blade is 6.35mm at the tip (7) of the rear blade; the leading edge (9) of the blade and the trailing edge (10) The leading edge blade angle β₁ and the trailing edge blade angle β₂ of the front row blade root (4) are -70.20° and -18.70° respectively, and the front row blade leading edge (9) and the front row blade trailing edge (10) are at The leading edge blade angle β₁ and the trailing edge blade angle β₂ of the front blade tip (6) are -60.3° and -31.2° respectively; the leading edge (11) and the trailing edge (12) of the rear blade are at The leading edge blade angle β₁ and the trailing edge blade angle β₂ of the rear row blade root (5) are respectively -39.1° and 11.5°, and the rear row blade leading edge (11) and the rear row blade trailing edge (12) are in the rear row The leading edge blade angle β₁ and the trailing edge blade angle β₂ of the blade tip (7) are -30.3° and 8.9° respectively, and the front row blade installation angle β_y is -47.7° at the front row blade root (4). The front blade tip (6) is -48.8°; the rear blade installation angle β_y is -13.7° at the rear blade root (5), and -10.6° at the rear blade tip (7). The axial length of the root (4) is 6.48mm, the axial length of the front blade tip (6) is 6.28mm; the axial length of the rear blade root (5) is 5.74mm, and the rear blade tip (7 ) has an axial length of 5.74mm.2.根据权利要求1所述的人工心脏血液泵的串列叶栅静子结构，其特征在于：所述的静子叶片的前后排叶片在周向位置结构上：后排叶片前缘在根部和尖部均位于前排两片叶片之间周向角度的35％位置，由于轮毂为回转面结构，反映在展开的二维叶栅结构图上：沿垂直轴向的回转面弧向方向上，后排叶片中弧线前缘点至前排叶片中弧线延长线的弧向长度L₁占前排叶片两相邻叶片中弧线的弧向距离L的比例为35％，其中，L₁和L处在同一子午轴向位置上，计算L₁时取的前排叶片为压力面相邻后排叶片的前排叶片。2. The tandem cascade stator structure of an artificial heart blood pump according to claim 1, characterized in that: the front and rear row blades of the stator blades are in the circumferential position structure: the leading edge of the rear row blades is at the root and tip Both are located at 35% of the circumferential angle between the two blades in the front row. Since the hub is a rotating surface structure, it is reflected in the unfolded two-dimensional cascade structure diagram: in the arc direction of the rotating surface along the vertical axis, the rear The arc length_L1 of the leading edge point of the arc in the row of blades to the extension line of the arc in the front row of blades accounts for 35% of the arc distance L of the arc in the two adjacent blades of the front row of blades, wherein_L1 and L is at the same meridional axial position, and the front row of blades taken when calculating_L1 is the front row of blades adjacent to the rear row of blades on the pressure surface.

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