WO2018153350A1 - 叶轮以及电动泵 - Google Patents

叶轮以及电动泵 Download PDF

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Publication number
WO2018153350A1
WO2018153350A1 PCT/CN2018/076997 CN2018076997W WO2018153350A1 WO 2018153350 A1 WO2018153350 A1 WO 2018153350A1 CN 2018076997 W CN2018076997 W CN 2018076997W WO 2018153350 A1 WO2018153350 A1 WO 2018153350A1
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WO
WIPO (PCT)
Prior art keywords
blade
impeller
lower cover
distance
upper cover
Prior art date
Application number
PCT/CN2018/076997
Other languages
English (en)
French (fr)
Inventor
牛莲静
宁强
张峻
鲍俊峰
Original Assignee
杭州三花研究院有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 杭州三花研究院有限公司 filed Critical 杭州三花研究院有限公司
Priority to CN201880004616.2A priority Critical patent/CN109996967A/zh
Publication of WO2018153350A1 publication Critical patent/WO2018153350A1/zh

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/18—Rotors
    • F04D29/22—Rotors specially for centrifugal pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/18—Rotors
    • F04D29/22—Rotors specially for centrifugal pumps
    • F04D29/2205—Conventional flow pattern
    • F04D29/2216—Shape, geometry
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/18—Rotors
    • F04D29/22—Rotors specially for centrifugal pumps
    • F04D29/2261—Rotors specially for centrifugal pumps with special measures
    • F04D29/2272—Rotors specially for centrifugal pumps with special measures for influencing flow or boundary layer
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/18—Rotors
    • F04D29/22—Rotors specially for centrifugal pumps
    • F04D29/24—Vanes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/18—Rotors
    • F04D29/22—Rotors specially for centrifugal pumps
    • F04D29/24—Vanes
    • F04D29/242—Geometry, shape
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/18—Rotors
    • F04D29/22—Rotors specially for centrifugal pumps
    • F04D29/24—Vanes
    • F04D29/242—Geometry, shape
    • F04D29/245—Geometry, shape for special effects
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/669—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for liquid pumps

Definitions

  • the invention relates to the technical field of vehicles and the like, and in particular to an impeller and an electric pump.
  • centrifugal pumps are gradually developing in the direction of miniaturization and high energy efficiency.
  • the design of the impeller is the key to improve the performance of the pump.
  • the overall size of the centrifugal pump is small, and the diameter corresponding to the impeller is also relatively small.
  • the conventional blade is difficult to meet the high hydraulic efficiency requirements of the centrifugal pump at a low specific speed and small flow rate.
  • an impeller includes an upper cover, a lower cover, and a plurality of blades, the blade being located between the upper cover and the lower cover, the blade A blade head, a blade tail, a blade tip, a blade root, a first side, and a second side, the first side and the second side being disposed between the blade top and the blade root
  • the first side portion includes a first portion
  • the second side portion includes a second portion and a third portion
  • the second portion is disposed closer to the center of the impeller than the third portion
  • the blade head is toward the blade tail, the distance from the second portion to the first portion is gradually increased, and the distance from the third portion to the first portion is gradually decreased.
  • An impeller includes an upper cover, a lower cover, and a plurality of blades, the blade being located between the upper cover and the lower cover, the blade including a blade top, a blade root, a first side, and a second side portion, the first side portion and the second side portion being disposed between the blade top and the blade root, the first side portion including a first portion, the second side portion including a second portion and a third portion, the second portion being disposed closer to the central axis of the impeller than the third portion, the first portion being a convex surface, the second portion being a concave surface, the blade having a circumferential thickness
  • the circumferential thickness includes a first type of circumferential thickness and a second type of circumferential thickness, the first type of circumferential thickness refers to a circumferential thickness between the first portion and the second portion, and the second type of circumferential thickness is Means a circumferential thickness between the first portion and the third portion, the first circumferential thickness gradually increasing from an outer edge of the
  • the invention also discloses an electric pump comprising a rotor assembly and a stator assembly, the rotor assembly comprising a permanent magnet and an impeller, the stator assembly comprising a coil and a support, the coil being wound around the support, the coil After the energization, the permanent magnet can be driven to rotate, the permanent magnet can drive the impeller to rotate, and the impeller is the impeller described above.
  • the impeller of the present invention includes an upper cover, a lower cover, and a blade, the blade including a blade head, a blade tail, a blade top, a blade root, a first portion, a second portion, and a third portion, from the blade head to the blade tail portion,
  • the distance from the second portion to the first portion is gradually increased, so that the displacement coefficient of the blade can be increased, which can be advantageous to the stability of the lift curve of the centrifugal pump of the impeller and the efficiency of the centrifugal pump to which the impeller is applied;
  • the distance from the third portion to the first portion is gradually reduced, which can reduce the vortex loss to a certain extent and improve the hydraulic efficiency of the electric pump to which the impeller is applied.
  • FIG. 1 is a schematic perspective view of an electric drive centrifugal pump
  • Figure 2 is a cross-sectional view of the electrically driven centrifugal pump of Figure 1 taken along the A-A direction;
  • Figure 3 is a schematic view showing the split structure of the rotor assembly of Figure 2;
  • Figure 4 is a perspective structural view of the upper cover assembly of Figure 3;
  • Figure 5 is a front elevational view of the upper cover assembly of Figure 3;
  • Figure 6 is a bottom plan view of the upper cover assembly of Figure 5.
  • the electric drive centrifugal pump is referred to as an electric pump.
  • the electric drive centrifugal pump belongs to a centrifugal pump.
  • the centrifugal pump also includes a mechanical centrifugal pump.
  • the electrically driven centrifugal pump drives the impeller through the rotor, and the mechanical centrifugal pump moves through the mechanical movement.
  • the present invention is specifically described by taking an electrically driven centrifugal pump as an example.
  • FIG. 1 is a perspective view of a three-dimensional structure of an electrically driven centrifugal pump 100
  • FIG. 2 is a schematic cross-sectional view of the electrically driven centrifugal pump of FIG. 1 along the AA direction.
  • the electrically driven centrifugal pump 100 The first housing 11 and the second housing 12, the rotor assembly 2, the stator assembly 3 and the end cover 13 are connected.
  • the first housing 11 is connected to the second housing 12, and the second housing 12 and the end cover 13 are connected.
  • the driven centrifugal pump 100 includes a accommodating chamber including a space formed by a first housing 11, a second housing 12, and an end cap 13, the rotor assembly 2 and the stator assembly 3 are located in the accommodating chamber, and the stator assembly 3 includes a coil And the support portion, the coil is wound around the support portion, and after the coil is energized, the permanent magnet provided in the rotor assembly 2 can be driven to rotate, and the permanent magnet can drive the impeller to rotate.
  • the rotor assembly 2 includes the impeller 21 and the rotor 22 in addition to the above-described permanent magnet body.
  • the impeller may be included, and the rotor is not included.
  • the impeller 21 includes an upper cover assembly 4 and a lower cover 5, and the upper cover assembly 4 includes a plurality of blades 41 and an upper cover 42 which are located on the upper cover 42 and the lower cover 5 Between the blades 41 and the upper cover 42 are integrally injection molded, and the blades 41 are welded to the lower cover 5. As another embodiment, the blades are integrally formed with the lower cover, or the blades are located between the upper cover and the lower cover.
  • the impeller 21 also includes an impeller central axis and an impeller plane, wherein the impeller central axis refers to the central axis of the upper cover plate, and the impeller plane refers to a surface that is perpendicular to the central axis of the impeller.
  • the plurality of blades 41 are equally arranged circumferentially on the upper cover 42 or the plurality of blades 41 are evenly distributed on the upper cover 42, each of which has the same structure.
  • increasing the number of blades 41 can improve the impeller's ability to restrain the working medium, which is beneficial to improve hydraulic efficiency.
  • increasing the number of blades 41 will also cause the flow of working medium between adjacent blades 41.
  • the narrowing of the road, especially the flow cross-sectional area at the impeller inlet is reduced, thereby reducing the hydraulic efficiency and even causing cavitation; according to the hydraulic test results, when the upper cover includes an even number of blades, it is beneficial to the dynamic balance during the rotation of the rotor.
  • the number of blades is eight, and according to the outer diameter of the impeller and the size of the first circumference, eight blades can achieve the desired state of the flow path size and the impeller to the working medium.
  • 4-8 blades are placed on the upper cover 42. Graphical marking is performed on a plurality of blades for ease of description.
  • the blade 41 includes a blade top 411 and a blade root 412, a blade head a, a blade tail b, the blade 41 having a first side and a second side, wherein the first side and the second side are disposed on the blade top 411 and Between the blade roots 412, the blade roots 412 are integrally injection molded with the upper cover 42.
  • the first side receives more pressure than the second side.
  • the first side portion includes a first portion 413
  • the second side portion includes a second portion 414 and a third portion 415
  • the second portion 414 is closer to the center of the impeller than the third portion 415
  • the first portion 413 is convex
  • the second portion 414 is As a concave surface, as other embodiments, the first portion 413 and the second portion 414 may be flat.
  • the distance from the blade head a to the blade root b, the second portion 414 to the first portion 413 gradually increases, where the distance from the second portion 414 to the first portion 413 refers to the point on the second portion 414
  • the minimum value of the distance between any points on the first portion 413 gradually decreases from the blade head a to the blade root b, and the distance from the third portion 415 to the first portion 413, where the third portion 413 is first
  • the distance of the portion 413 refers to the minimum distance between the point on the third portion 415 and any point on the first portion 413.
  • the distance of the second portion 414 from the blade head a to the blade root b and the second portion 414 to the first portion 413 is gradually increased, which can increase the displacement coefficient of the blade, and can contribute to the lift of the electrically driven centrifugal pump to a certain extent.
  • the back pressure side includes a third portion 415, from the blade head a to the blade root b, and the distance of the third portion 415 from the first portion 413 gradually
  • the third portion 415 can reduce the vortex loss to a certain extent, and correspondingly increase the lift and efficiency of the electrically driven centrifugal pump to a certain extent.
  • the blade 41 further includes a first connecting portion 416 that connects the second portion 414 and the third portion 415.
  • the first portion 413, the first connecting portion 416 are convex, and the first portion 413 is inconsistent with the protruding direction of the first connecting portion 416, the second portion 414 is smoothly connected with the first connecting portion 416, the third portion 415 is smoothly connected with the first connecting portion 416, and the second portion 414 and the third portion 415 are connected.
  • the second portion 414 is a concave surface
  • the third portion 415 is a plane, wherein the first portion 413 is referenced, and the second portion 414 is spaced from the first portion 413 by the impeller center axial impeller
  • the outer edge gradually increases, where the distance of the second portion 414 from the first portion 413 means, referring to FIG. 7, the second portion 414 has a first point M, and at the first point M has a tangent to the second portion.
  • the first tangent line m has a first vertical line n at the first point M, the first vertical line n is perpendicular to the first tangent line m and the foot is the first point M, the first vertical line n and the first
  • the portion 313 intersects and the intersection point is the first intersection point N, and the distance between the first point M and the first intersection point N is referred to as the distance of the second portion 414 from the first portion 413 at the point;
  • the distance of a connecting portion 416 from the first portion 413 is similar to the distance from the second portion to the first portion, that is, the first connecting portion 416 has a point called a second point, and the second point has a tangent called a second point.
  • the tangent line has a second vertical line at a second point, the second vertical line passes through the second point and is perpendicular to the second tangent line, and the intersection of the second vertical line and the second portion 413 is referred to as a second intersection point, and the second point
  • the distance from the second intersection is referred to as the distance of the first connection portion 416 from the first portion 413.
  • the distance of the first connecting portion 416 from the first portion 413 is greater than the distance of the second portion 414 from the first portion 413 , where the distance of the first connecting portion 416 from the first portion 413 is greater than the distance from the second portion 414 to the first portion 413 .
  • the distance means that there is at least one point on the first connecting portion 416, the point is called the first arbitrary point, the second portion 414 has at least one point, the point is called the second arbitrary point, and the second point is at the second point.
  • the distance from the first portion 413 is the maximum value of the distance from the first portion 413 of the second portion 414.
  • the distance of the first connecting portion 416 from the first portion 413 is greater than the second arbitrary point at the first arbitrary point.
  • the distance of the third portion 415 from the first portion 413 means that there is a point on the third portion called a third point, and at the third point, there is a third tangent line tangent to the third portion, at the third point.
  • the distance of the third portion 415 from the first portion 413 is referred to as the distance of the third portion 415 from the first portion 413.
  • the distance of the first connecting portion 416 from the first portion 413 is greater than the distance of the third portion 415 from the first portion 413 , where the distance of the first connecting portion 416 from the first portion 413 is greater than the distance from the third portion 415 to the first portion 413 .
  • the distance means that at least one point on the first connecting portion 416 is called a third arbitrary point, at least a point in the third portion 414 is called a fourth arbitrary point, and the third point is at a fourth arbitrary point.
  • the distance from the first portion 413 is the maximum value of the distance from the first portion 413 of the third portion 414. At the third arbitrary point, the distance between the first connecting portion 416 and the first portion 413 is greater than the fourth arbitrary point.
  • the blade 41 further includes a second connecting portion 417 that connects the first portion 413 and the third portion 415. The second connecting portion 417 is connected to the first portion 413 and the third portion 415, respectively.
  • the second connecting portion 417 is connected to the first portion 413 and the third portion 415, respectively. Aligned with the outer edge of the upper cover, the second connecting portion 417 has a circumferential thickness along the circumferential direction of the outer edge of the upper cover, and the circumferential thickness refers to the second connecting portion 417 from the lower cover along the axial center of the impeller
  • the arc length of the cover projection is theoretically greater than or equal to 0.3 mm. In practical applications, the circumferential thickness may be greater than or equal to 0.5 mm.
  • the third portion 415 has a projection from the lower cover plate along the axial center of the impeller, and the third portion 415 includes a boundary portion A, and the boundary portion A refers to the third portion from the lower cover plate along the axial center of the impeller.
  • the intersection of the projection and the outer edge of the upper cover, the impeller 21 includes a first limit portion, which means that when the second connection portion 417 has a circumferential thickness of 0.3 mm, the third portion is from the lower cover plate along the center of the impeller An intersection of the projection of the axial upper cover and the outer edge of the upper cover; the impeller 21 further includes a second limit portion, the second limit portion being the extension of the second portion 414 from the lower cover along the axial center of the impeller.
  • the intersection of the projection of the cover plate and the outer edge of the upper cover, the extended surface of the second portion 414 refers to the surface extending to the outer edge of the impeller without changing the degree of bending of the second portion; the boundary portion A is located at the first limit
  • the third portion may be a curved surface, and the bending direction of the third portion is different from the bending direction of the second portion, specifically, the second portion is a concave surface, and the second portion is an axial impeller from the center of the impeller.
  • the distance from the outer edge to the first portion is gradually increased; the third portion is convex, and the third portion is different from the direction in which the first portion is convex, and the third portion is from the center of the impeller, and the outer edge of the impeller is away from the first portion.
  • the first connecting portion is convex, the first connecting portion is in the same direction as the third portion, the first connecting portion is smoothly connected with the second portion and the third portion, and the distance between the first connecting portion and the first portion is greater than The distance from the third portion to the first portion, where the distance between the first connecting portion and the first portion is greater than the distance from the third portion to the first portion means that the first connecting portion has at least one point, and the first connecting portion at the point
  • the distance from the first portion is greater than the maximum distance of the third portion from the first portion; the distance of the first connecting portion from the first portion is greater than the distance from the second portion to the first portion, where the first connecting portion is distanced
  • the distance of one part is greater than the distance of the second part Refers to a distance, that is present on the first connecting portion, the distance of the first portion of the first connecting portion at a point greater than the maximum distance of the first portion from the second portion.
  • the third portion is a curved surface, and the bending direction of the third portion is the same as the bending direction of the second portion.
  • the second portion is a concave surface, and the second portion is a distance from the outer edge of the impeller center axial direction of the impeller.
  • the distance of the first portion is gradually increased; the third portion is a concave surface, and the distance from the outer portion of the third portion from the center of the impeller to the first portion is gradually reduced; the first connecting portion is a convex surface, the first connecting portion and the second portion
  • the third portion is smoothly connected, and the distance of the first connecting portion from the first portion is greater than the distance from the third portion to the first portion, where the distance between the first connecting portion and the first portion is greater than the distance of the third portion from the first portion It means that there is at least one point of the first connecting portion, at which point the distance of the first connecting portion from the first portion is greater than the maximum distance of the third portion from the first portion; the distance of the first connecting portion from the first portion is greater than the second a distance from the first portion, where the distance of the first connecting portion from the first portion is greater than the distance from the second portion of the second portion means that there is a point on the first connecting portion, and the first connection is at the point The distance from the first part is greater than The maximum distance from
  • the blade 41 has a circumferential thickness h, and the circumferential thickness means that an impeller surface has an intersection with the central axis of the impeller.
  • the intersection is referred to as a first central point O, and the first central point O is a center of the circle to scatter different radii.
  • the circumferential thickness includes a first type of circumferential thickness h1 and a second type of circumferential thickness h2, and the first type of circumferential thickness h1 is between the first portion and the second portion.
  • the circumferential thickness of the second type, the circumferential thickness h2 of the second type refers to the circumferential thickness between the first portion and the third portion, and the first type of circumferential thickness h1 gradually increases from the outer edge of the impeller center axial impeller, and the circumferential thickness h2 increases.
  • the displacement coefficient of the blade can be increased after being away from the impeller inlet, the impeller blade is relatively thick, the displacement coefficient is relatively large, and the overflow area of the impeller is relatively reduced.
  • Centrifugal pump Rate second circumferential thickness from the outer edge of the impeller axial center of the impeller gradually decreases.
  • the blade 41 is gradually increased in distance from the first portion 413 from the outer edge of the impeller center axial impeller, and the third portion 415 is gradually increased from the first portion 413.
  • a structure is generated during the blade forming process.
  • the blade 41 is provided with a hollow portion 418 which is a blind hole formed from the blade top portion 411 to the upper cover plate 42.
  • the depth of the blind hole is less than or equal to the height of the blade 41, and the blade 41 The height refers to the distance between the blade top 411 and the blade root 412.
  • the provision of the hollow portion 418 is advantageous to keep the wall thickness of the blade 41 uniform.
  • the hollow portion 418 can also reduce the mass of the blade 41.
  • the maximum distance of the first connecting portion 416 from the first portion 413 is greater than or equal to 1.5 times the minimum distance of the second portion 414 from the first portion 413
  • the blade 41 is provided with a hollow portion
  • the hollow portion 418 is from the blade top portion 411 a blind hole formed by the extension of the upper cover plate 42.
  • the depth of the blind hole is less than or equal to the height of the blade 41.
  • the median width of the blind hole is greater than 1 mm.
  • the median width of the blind hole refers to the radial direction along the outer edge of the impeller, and the blind hole has a middle hole.
  • the hollow portion 418 is located at least between the first connecting portion 416 and the first portion 413, as shown in FIGS.
  • the shape of the hollow portion 418 is substantially similar to the cross-sectional shape of the blade, where the cross-section of the blade refers to the cross-section of the blade taken in a plane parallel to the plane of the impeller.
  • the hollow portion is relatively close to the outer edge of the impeller, and the hollow portion 418 is located at least between the second connecting portion 416 and the first portion 413.
  • the hollow portion 418 can reduce the quality of the impeller to a certain extent and can reduce the deformation of the injection molding of the blade.
  • the upper cover assembly 4 includes a blade 41 and an upper cover 42.
  • the blade 41 and the upper cover 42 are integrally injection molded. Referring to FIG. 3, the upper cover 42 is welded and fixed to the lower cover 5 by the blade 41.
  • the lower cover 5 includes a lower cover groove 51 and a lower cover body 52.
  • the lower cover groove 51 is equally spaced around the lower cover body 52 or the lower cover groove 51 is evenly distributed on the lower cover body 52.
  • the blade top 411 is disposed corresponding to the lower cover groove 51, and the number of the lower cover grooves 51 corresponds to the number of the blades 41.
  • the lower cover groove 51 includes a first engaging portion 511, a second engaging portion 512, a third engaging portion 513, and a first connecting mating portion 514, wherein the first engaging portion 511 is a convex surface, and the first engaging portion 511 and the blade portion One of the 411s is mated and has the same shape; the second mating portion 512 is a concave surface, the second mating portion is mated with the second portion of the blade and has the same shape; the third mating portion 513 is mated with the third portion of the blade and has the same shape; The connecting mating portion 514 is connected to the second mating portion 512 and the third mating portion 513.
  • the first connecting mating portion 514 is matched with the first connecting portion 416 and has the same shape; the shape of the lower cover recess 51 is the same as that of the blade top portion 411.
  • the blade top 411 is located in the lower cover recess 51.
  • the blade top 411 is provided with a first engaging portion 419
  • the lower cover groove 51 is provided with a first engaging fitting portion 515
  • the first engaging portion 419 is welded to the first engaging fitting portion 515.
  • the first engaging portion 419 protrudes from the blade top portion 411 and the first engaging portion 419 is disposed adjacent to the blade first portion 413, and the first engaging portion 419 can be flexibly extended according to the curved shape of the first portion 413; the lower cover groove 51
  • the bottom surface of the lower cover groove is disposed on the bottom surface of the lower cover groove.
  • the first joint engagement portion 515 is circumferentially disposed on the bottom surface of the lower cover groove.
  • the blade top 411 is provided with a positioning post 4110, the positioning post 4110 is closer to the impeller central axis than the blade hollow portion 418, and the lower cover 5 is provided with a positioning groove (not shown)
  • the positioning post 4110 is partially or entirely located in the positioning slot, and the positioning post 4110 and the positioning slot function as positioning.

Abstract

一种叶轮，包括上盖板（42）、下盖板（5）以及多个叶片（41），叶片（41）位于上盖板（42）和下盖板（5）之间，包括承压侧面和背压侧面，承压侧面包括第一部（413），背压侧面包括第二部（414）和第三部（415），第一部（413）为凸面，第二部（414）为凹面，以第一部（413）为参考，第二部（414）能够增加叶片（41）的排挤系数，在一定程度上能够有利于提高应用此叶轮的离心泵的扬程曲线的稳定性和提高离心泵的效率；第三部（415）能够在一定程度上减少叶轮的漩涡损失并提高离心泵的水力效率。还包括一种设置有该叶轮的电动泵。

Description

叶轮以及电动泵
本申请要求于2017年02月24日提交中国专利局、申请号为201710101912.1、发明名称为“一种车用水泵叶轮结构”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本发明涉及车辆等技术领域，具体涉及一种叶轮及电动泵。
背景技术
当今，离心泵逐步向小型化、高能效方向发展，而离心泵设计中，叶轮的设计是提高泵性能的关键；现有设计中，离心泵的整体尺寸小，对应于叶轮的直径也比较小，在这种情况下，传统的叶片很难满足低比转速小流量下的离心泵高水力效率要求。
因此，有必要对现有的技术进行改进，以解决以上技术问题。
发明内容
本发明的目的在于提供一种叶轮和应用此叶轮的电动泵，这种叶轮可以提高应用此叶轮的离心泵的水力效率。
为实现上述目的，本发明采用如下技术方案：一种叶轮，包括上盖板、下盖板以及多个叶片，所述叶片位于所述上盖板和所述下盖板之间，所述叶片包括叶片头部、叶片尾部、叶片顶部、叶片根部、第一侧部以及第二侧部，所述第一侧部和所述第二侧部设置于所述叶片顶部和所述叶片根部之间，其特征在于：所述第一侧部包括第一部，所述第二侧部包括第二部和第三部，所述第二部比所述第三部靠近叶轮中心设置，自所述叶片头部向所述叶片尾部，所述第二部到所述第一部的距离逐渐增大，所述第三部到所述第一部的距离逐渐减小。
一种叶轮，包括上盖板、下盖板以及多个叶片，所述叶片位于所述上盖板和所述下盖板之间，所述叶片包括叶片顶部、叶片根部、第一侧部以及第二侧部，所述第一侧部和所述第二侧部设置于所述叶片顶部和所述叶片根部之间，所述第一侧部包括第一部，所述第二侧部包括第二部和第三部，所述第二部比所述第三部靠近叶轮中心轴设置，所述第一部为凸面， 所述第二部为凹面，所述叶片具有圆周厚度，所述圆周厚度包括第一类圆周厚度和第二类圆周厚度，所述第一类圆周厚度是指位于所述第一部和所述第二部之间的圆周厚度，所述第二类圆周厚度是指位于所述第一部和所述第三部之间的圆周厚度，所述第一圆周厚度自叶轮中心轴向叶轮的外缘逐渐增大，所述第二圆周厚度自叶轮中心轴向叶轮的外缘逐渐减小。
本发明还公开了一种电动泵，包括转子组件和定子组件，所述转子组件包括永磁体和叶轮，所述定子组件包括线圈和支撑部，所述线圈缠绕于所述支撑部，所述线圈通电后能够驱动所述永磁体转动，所述永磁体能够带动所述叶轮转动，所述叶轮为上述的叶轮。
本发明的叶轮包括上盖板、下盖板以及叶片，叶片包括叶片头部、叶片尾部、叶片顶部、叶片根部、第一部、第二部以及第三部，自叶片头部向叶片尾部，第二部到第一部的距离逐渐增大，这样可以增加叶片的排挤系数，在一定程度上能够有利于此叶轮的离心泵的扬程曲线的稳定性和提高应用此叶轮的离心泵的效率；第三部到第一部的距离逐渐减小，这样能够一定程度上能够减少漩涡损失，提高应用此叶轮的电动泵的水力效率。
附图说明
图1是电驱动式离心泵的一种立体结构示意图；
图2是图1中电驱动式离心泵沿A-A方向的剖面示意图；
图3是图2中转子组件的分体结构示意图；
图4是图3中上盖板组件的一个立体结构示意图；
图5是图3中上盖板组件的一个正视结构示意图；
图6是图5中上盖板组件的一个仰视结构示意图。
具体实施方式
下面结合附图和具体实施例对本发明作进一步说明：
电驱动式离心泵简称电动泵，电驱动式离心泵属于离心泵的一种，离心泵还包括机械式离心泵，电驱动式离心泵是通过转子带动叶轮转动，机械式离心泵是通过机械运动带动叶轮转动，本发明以电驱动式离心泵为例进行具体说明。
图1为一种电驱动式离心泵100的一个立体结构示意图，图2为图1中电驱动式离心泵沿A-A方向的剖面示意图，请结合参考图1和图2，电驱动式离心泵100包括第一壳体11、第二壳体12、转子组件2、定子组件3以及端盖13，第一壳体11与第二壳体12连接，第二壳体12和端盖13连接，电驱动式离心泵100包括容纳腔，该容纳腔包括第一壳体11、第二壳体12以及端盖13形成的空间，转子组件2和定子组件3位于所述容纳腔，定子组件3包括线圈和支撑部，线圈缠绕于支撑部，线圈通电后能够驱动设于转子组件2的永磁体转动，永磁体能够带动叶轮转动。上述对于定子组件3结构的描述属于本领域的公知常识。在本实施例中，转子组件2除包括上述永磁体外，转子组件2还包括叶轮21和转子22，当然，对于机械式离心泵转子组件可以只包括叶轮，不包括转子。
请参考图3和图4，叶轮21包括上盖板组件4和下盖板5，上盖板组件4包括多个叶片41和上盖板42，叶片41位于上盖板42和下盖板5之间，叶片41与上盖板42一体注塑成形，叶片41与下盖板5焊接固定，作为其它实施方式，叶片与下盖板一体成形，或者叶片位于上盖板和下盖板之间。叶轮21还包括叶轮中心轴和叶轮平面，其中，叶轮中心轴是指上盖板的中心轴，叶轮平面是指在垂直于叶轮中心轴的面。
多个叶片41等距圆周排布于上盖板42或者多个叶片41均匀分布于上盖板42上，每个叶片结构均相同。根据离心泵设计的一般原理，增加叶片41的个数可以提高叶轮对工作介质的约束能力，有利于提高水力效率，但是增加叶片41个数也会使相邻叶片41之间工作介质的流通流道变窄，特别是叶轮进口处的流通截面积降低，从而降低水力效率，甚至引发汽蚀；根据水力测试结果，上盖板包括偶数个叶片时，有利于转子旋转过程中的动平衡，本实施例中叶片的数量为8个，而且根据叶轮外径以及第一圆周的尺寸要求，8个叶片可以使流道尺寸和叶轮对工作介质的拘束达到理想的状态。当然可根据电驱动离心泵的整体扬程和水力效率，上盖板42上设置4-8个叶片。为了便于描述，在多个叶片上进行图形标记。叶片41包括叶片顶部411和叶片根部412、叶片头部a、叶片尾部b，叶片41具有第一侧部和第二侧部，其中，第一侧部和第二侧部设置于叶片顶部411和叶片根部412之间，叶片根部412与上盖板42一体注塑成形，在电驱动式离 心泵100工作时，第一侧部承受的压力要大于第二侧部承受的压力。第一侧部包括第一部413，第二侧部包括第二部414和第三部415，第二部414比第三部415更靠近叶轮中心，第一部413为凸面，第二部414为凹面，作为其它实施方式，第一部413、第二部414可为平面。自叶片头部a向叶片根部b，第二部414到第一部413的距离逐渐增大，此处，第二部414到第一部413的距离是指在第二部414上的点与第一部413上任意点之间的距离的最小值，自叶片头部a向叶片根部b，第三部415到第一部413的距离逐渐减小，此处，第三部413到第一部413的距离是指第三部415上的点与第一部413上任意点之间的距离最小值。第二部414自叶片头部a向叶片根部b，第二部414到第一部413的距离逐渐增大，能够增加叶片的排挤系数，在一定程度上能够有利于电驱动式离心泵的扬程曲线的稳定性和提高电驱动式离心泵的效率；在未设置第三部，当叶轮21进行旋转，背压侧面靠近叶轮外缘区域会产生因工作介质分离而形成的漩涡损失，这种漩涡损失在一定程度上能够降低电驱动式离心泵的扬程和效率，因此，背压侧面包括第三部415，自叶片头部a向叶片根部b，第三部415距离第一部413的距离逐渐减小，第三部415在一定程度上能够减少漩涡损失，相应地一定程度上相对提高电驱动离心泵的扬程和效率。
叶片41还包括第一连接部416，第一连接部416连接第二部414和第三部415，在本实施例中，第一部413、第一连接部416为凸面，并且，第一部413与第一连接部416所凸出方向不一致，第二部414与第一连接部416光滑相连接，第三部415与第一连接部416光滑相连接，第二部414与第三部415通过第一连接部416光滑过度；第二部414为凹面，第三部415为平面，其中，以第一部413为参考，第二部414距离第一部413的距离由叶轮中心轴向叶轮外缘逐渐增加，此处第二部414距离第一部413的距离是指，请参考图7，第二部414上有第一点M，在第一点M处具有与第二部相切的第一切线m，在第一点M处具有第一垂直线n，第一垂直线n与第一切线m相垂直且垂足为第一点M，第一垂直线n与第一部313相交且交点为第一交点N，第一点M和第一交点N之间的距离称为在该点处第二部414距离第一部413的距离；第一连接部416距离第一部413的距离与第二部距离第一部的距离类似，即第一连接部416上具有一点称 为第二点，在该第二点处具有切线称为第二切线，在第二点处有第二垂直线，该第二垂直线经过第二点并且与第二切线相垂直，第二垂直线与第二部413有交点称为第二交点，第二点与第二交点之间的距离称为第一连接部416距离第一部413的距离。第一连接部416距离第一部413的距离大于第二部414距离第一部413的距离，此处第一连接部416距离第一部413的距离大于第二部414距离第一部413的距离是指，在第一连接部416上至少存在一点该点称为第一任意点，第二部414上至少存在一点该点称为第二任意点，在第二任一点处第二部距414距离第一部413的距离为第二部414距离第一部413的距离的最大值，在第一任意点处第一连接部416距离第一部413的距离大于第二任意点处第二部415距离第一部413的距离。第三部415距离第一部413的距离是指，在第三部上有一点称为第三点，在该第三点处具有与第三部相切的第三切线，在第三点处还有与第三切线相垂直的第三垂直线，第三垂直线经过第三点，第三垂直线与第一部413具有交点称为第三交点，第三点与第三交点之间的距离称为第三部415距离第一部413的距离。第一连接部416距离第一部413的距离大于第三部415距离第一部413的距离，此处第一连接部416距离第一部413的距离大于第三部415距离第一部413的距离是指，在第一连接部416上至少存在一点该点称为第三任意点，在第三部414至少存在一点该点称为第四任意点，在第四任意点处第三部距414距离第一部413的距离为第三部414距离第一部413的距离的最大值，在第三任意点处第一连接部416距离第一部413的距离大于在第四任意点处第三部415距离第一部413的距离。叶片41还包括第二连接部417，第二连接部417连接第一部413和第三部415，第二连接部417分别与第一部413、第三部415相连接，第二连接部417与上盖板的外缘对齐设置，第二连接部417沿上盖板的外缘圆周方向具有周向厚度，该周向厚度是指第二连接部417自下盖板沿叶轮中心轴向上盖板投影的弧长，该周向厚度理论上要大于等于0.3mm，实际应用中周向厚度可采用大于等于0.5mm。第三部415自下盖板沿叶轮中心轴向上盖板有投影，第三部415包括边界部A，该边界部A是指第三部自下盖板沿叶轮中心轴向上盖板4的投影与上盖板外缘的相交部分，叶轮21包括第一极限部，该第一极限部是指当第二连接部417周向厚度为0.3mm，第三 部自下盖板沿叶轮中心轴向上盖板的投影与上盖板外缘的相交部分；叶轮21还包括第二极限部分，该第二极限部分是指第二部414的延伸面自下盖板沿叶轮中心轴向上盖板的投影与上盖板外缘的相交部分，第二部414的延伸面是指不改变第二部弯曲程度的情况向叶轮外缘延伸的面；边界部A位于第一极限部和第二极限部之间，边界部A能够与第一极限部重合，边界部A与第二极限部不重合。
当然，作为其它实施方式，第三部可为曲面，并且，第三部的弯曲方向与第二部的弯曲方向不同，具体地，第二部为凹面，第二部自叶轮中心轴向叶轮的外缘距离第一部的距离逐渐增加；第三部为凸面，并且，第三部与第一部凸出的方向不同，第三部自叶轮中心轴向叶轮的外缘距离第一部的距离逐渐减少；第一连接部为凸面，第一连接部与第三部凸出的方向相同，第一连接部与第二部、第三部光滑连接，第一连接部距离第一部的距离大于第三部距离第一部的距离，此处第一连接部距离第一部的距离大于第三部距离第一部的距离是指第一连接部至少存在一点，在该点处第一连接部距离第一部的距离大于第三部距离第一部的距离的最大值；第一连接部距离第一部的距离大于第二部距离第一部的距离，此处，第一连接部距离第一部的距离大于第二部距离第一部的距离是指，在第一连接部上存在一点，在该点处第一连接部距离第一部的距离大于第二部距离第一部的距离的最大值。
作为其它实施方式，第三部为曲面，并且，第三部的弯曲方向与第二部的弯曲方向相同，具体地，第二部为凹面，第二部自叶轮中心轴向叶轮的外缘距离第一部的距离逐渐增加；第三部为凹面，第三部自叶轮中心轴向叶轮的外缘距离第一部的距离逐渐减少；第一连接部为凸面，第一连接部与第二部、第三部光滑连接，第一连接部距离第一部的距离大于第三部距离第一部的距离，此处第一连接部距离第一部的距离大于第三部距离第一部的距离是指第一连接部至少存在一点，在该点处第一连接部距离第一部的距离大于第三部距离第一部距离的最大值；第一连接部距离第一部的距离大于第二部距离第一部的距离，此处，第一连接部距离第一部的距离大于第二部距离第一部的距离是指，在第一连接部上存在一点，在该点处第一连接部距离第一部的距离大于第二部距离第一部的距离的最大值。
请参考图7，叶片41具有圆周厚度h，圆周厚度是指一个叶轮面与叶轮中心轴有交点，该交点称为第一圆心点O，以第一圆心点O为圆心向外散射不同半径的圆并且该圆与叶片41的第一部和第二部相交或者该圆与叶片4的第一部413和第三部415相交，位于第一部413和第二部414、第一部413和第三部415之间的弧线长度即为圆周厚度，圆周厚度包括第一类圆周厚度h1和第二类圆周厚度h2，第一类圆周厚度h1是指位于第一部和第二部之间的圆周厚度，第二类圆周厚度h2是指位于第一部和第三部之间的圆周厚度，第一类圆周厚度h1自叶轮中心轴向叶轮的外缘逐渐增大，圆周厚度h2的增加能够在远离叶轮进口后增加叶片的排挤系数，叶轮叶片相对厚，排挤系数相对大，叶轮的过流面积相对减少，如此，可以相对增加电驱动式离心泵扬程曲线的稳定性和相对提高电驱动离心泵的效率；第二类圆周厚度自叶轮中心轴向叶轮的外缘逐渐减小。
叶片41自叶轮中心轴向叶轮的外缘第二部414距离第一部413距离逐渐增大，第三部415距离第一部413距离逐渐增大，这样的结构在叶片成形的过程中会产生形变等问题，为了减少变形等问题，叶片41设置中空部418，该中空部418是自叶片顶部411向上盖板42延伸形成的盲孔，该盲孔的深度小于等于叶片41的高度，叶片41的高度是指叶片顶部411和叶片根部412之间的距离，中空部418的设置有利于保持叶片41壁厚均匀，另一方面，中空部418还能够减少叶片41的质量。更具体地，第一连接部416距离第一部413的最大距离大于等于第二部414距离第一部413的最小距离的1.5倍，叶片41设置中空部，中空部418是是自叶片顶部411向上盖板42延伸形成的盲孔，该盲孔的深度小于等于叶片41的高度，该盲孔中位宽度大于1mm，盲孔中位宽度是指沿叶轮外缘径向方向，盲孔具有中位位置，在该中位位置处，沿叶轮外缘周向盲孔相对两边的距离大于1mm，中空部418至少位于第一连接部416和第一部413之间，在图4-图6所示的实施例中，中空部418的形状与叶片的截面形状大致相似，此处叶片的截面是指以与叶轮平面平行的面来截取叶片的截面。中空部相对靠近叶轮的外缘，中空部418至少位于第二连接部416与第一部413之间，中空部418在一定程度上可以减轻叶轮的质量并能够减少叶片的注塑成形的形变。
上盖板组件4包括叶片41和上盖板42，叶片41与上盖板42一体注塑成形，请参考图3，上盖板42通过叶片41与下盖板5焊接固定。下盖板5包括下盖板凹槽51和下盖板本体52，下盖板凹槽51等间距圆周排布于下盖板本体52或者下盖板凹槽51均匀分布在下盖板本体52上，叶片顶部411设置与下盖板凹槽51，下盖板凹槽51的个数于叶片41的个数相对应。下盖板凹槽51包括第一配合部511、第二配合部512、第三配合部513以及第一连接配合部514，其中，第一配合部511为凸面，第一配合部511与叶片第一部411相配合并且形状相同；第二配合部512为凹面，第二配合部与叶片第二部相配合并且形状相同；第三配合部513与叶片第三部相配合并且形状相同；第一连接配合部514连接第二配合部512和第三配合部513，第一连接配合部514与第一连接部416相配合并且形状相同；下盖板凹槽51的形状与叶片顶部411形状相同，叶片顶部411位于下盖板凹槽51。
为了便于叶片41和下盖板5焊接，叶片顶部411设置第一接合部419，下盖板凹槽51设置第一接合配合部515，第一接合部419与第一接合配合部515相焊接。其中，第一接合部419凸出于叶片顶部411并且第一接合部419靠近叶片第一部413设置，第一接合部419可按照第一部413弯曲形状弯曲顺延设置；下盖板凹槽51包括下盖板凹槽底面516，若干第一接合配合部515凸出设置于下盖板凹槽底面，第一接合配合部515可周向设置于下盖板凹槽底面。
为了便于上盖板组件4和下盖板5焊接，叶片顶部411设置定位柱4110，定位柱4110比叶片中空部418更靠近叶轮中心轴，下盖板5设置定位槽(图上未示出)，定位柱4110部分或者全部位于定位槽，定位柱4110和定位槽起到定位的作用。
需要说明的是：以上实施例仅用于说明本发明而并非限制本发明所描述的技术方案，例如对“内”、“外”“竖直”等方向性的界定，尽管本说明书参照上述的实施例对本发明已进行了详细的说明，但是，本领域的普通技术人员应当理解，所属技术领域的技术人员仍然可以对本发明进行相互组合、修改或者等同替换，而一切不脱离本发明的精神和范围的技术方案及其改进，均应涵盖在本发明的权利要求范围内。

Claims (10)

  1. 一种叶轮，包括上盖板、下盖板以及多个叶片，所述叶片位于所述上盖板和所述下盖板之间，所述叶片包括叶片头部、叶片尾部、叶片顶部、叶片根部、第一侧部以及第二侧部，所述第一侧部和所述第二侧部位于所述叶片顶部和所述叶片根部之间，其特征在于：所述第一侧部包括第一部，所述第二侧部包括第二部和第三部，所述第二部比所述第三部靠近叶轮中心设置；自所述叶片头部向所述叶片尾部，所述第二部至所述第一部的距离逐渐增大，所述第三部至所述第一部的距离逐渐减小。
  2. 根据权利要求1所述的叶轮，其特征在于，所述叶片包括第一连接部，所述第一连接部连接所述第二部和所述第三部，所述第一连接部与所述第二部、所述第三部光滑连接，所述第一部为凸面，所述第二部为凹面，所述第三部为平面，所述第一连接部为凸面，所述第一连接部距离所述第一部的距离大于所述第二部距离所述第一部的距离。
  3. 根据权利要求1所述的叶轮，其特征在于，所述叶片包括第一连接部，所述第一连接部连接所述第二部和所述第三部，所述第一连接部与所述第二部、所述第三部光滑连接，所述第一部为凸面，所述第二部为凹面，所述第三部为曲面，所述第三部的弯曲方向与所述第二部的弯曲方向不同，所述第一连接部和所述第三部均为凸面；
    或者所述叶片包括第一连接部，所述第一连接部连接所述第二部和所述第三部，所述第一连接部与所述第二部、所述第三部光滑连接，所述第一部为凸面，所述第二部为凹面，所述第三部为曲面，所述第三部的弯曲方向与所述第二部的弯曲方向相同，所述第一连接部为凸面，所述第一连接部距离所述第一部的距离大于所述第二部距离所述第一部的距离。
  4. 根据权利要求2或3所述的叶轮，其特征在于，所述叶片包括第二连接部，所述第二连接部连接所述第三部和所述第一部，所述第二连接部与所述下盖板外缘对齐设置。
  5. 如权利要求4所述的叶轮，所述第二连接部具有周向厚度，所述第三部自下盖板沿叶轮中心轴向上盖板有投影，所述第三部包括边界部，所述边界部是指所述第三部自下盖板沿叶轮中心轴向所述上盖板的投影与所 述上盖板外缘的相交部分，所述叶轮包括第一极限部，所述第一极限部是指当所述第二连接部周向厚度为0.3mm，所述第三部自下盖板沿叶轮中心轴向所述上盖板的投影与所述上盖板外缘的相交部分，所述叶轮包括第二极限部，所述第二极限部是指所述第二部的延伸面自下盖板沿叶轮中心轴向所述上盖板的投影与所述上盖板外缘的相交部分，所述边界部位于所述第一极限部和所述第二极限部之间，所述边界部能够与所述第一极限部重合，所述边界部与所述第二极限部不重合。
  6. 根据权利要求1-5任一项所述的叶轮，其特征在于，所述叶片包括中空部，所述中空部为自所述叶片顶部向所述叶片根部延伸形成的盲孔，所述盲孔深度小于等于所述叶片的高度。
  7. 根据权利要求1-5任一项所述的叶轮，其特征在于，所述第一连接部距离所述第一部的最大距离大于等于所述第二部距离所述第一部的最小距离的1.5倍，所述叶片包括中空部，所述中空部为自所述叶片顶部向所述叶片根部延伸形成的盲孔，所述盲孔的深度小于等于叶片的高度，所述盲孔中位宽度大于1mm。
  8. 根据权利要求6或7所述的叶轮，其特征在于，所述上盖板与所述叶片一体注塑，所述上盖板通过所述叶片与所述下盖板焊接固定，所述叶片顶部成形有定位柱，所述下盖板包括下盖板凹槽，所述叶片顶部设置于所述下盖板凹槽，所述下盖板凹槽个数与所述叶片个数相对应，所述下盖板具有定位槽，所述定位柱插入所述定位槽，所述定位柱比所述中空部靠近所述叶轮中心轴设置。
  9. 一种叶轮，包括上盖板、下盖板以及多个叶片，所述叶片位于所述上盖板和所述下盖板之间，所述叶片包括叶片顶部、叶片根部、第一侧部以及第二侧部，所述第一侧部和所述第二侧部设置于所述叶片顶部和所述叶片根部之间，其特征在于：所述第一侧部包括第一部，所述第二侧部包括第二部和第三部，所述第二部比所述第三部靠近叶轮中心轴设置，所述第一部为凸面，所述第二部为凹面，所述叶片具有圆周厚度，所述圆周厚度包括第一类圆周厚度和第二类圆周厚度，所述第一类圆周厚度是指位于所述第一部和所述第二部之间的圆周厚度，所述第二类圆周厚度是指位于所述第一部和所述第三部之间的圆周厚度，所述第一圆周厚度自叶轮中心 轴向叶轮的外缘逐渐增大，所述第二圆周厚度自叶轮中心轴向叶轮的外缘逐渐减小。
  10. 一种电动泵，包括转子组件和定子组件，所述转子组件包括永磁体和叶轮，所述定子组件包括线圈和支撑部，所述线圈缠绕于所述支撑部，所述线圈通电后能够驱动所述永磁体转动，所述永磁体能够带动所述叶轮转动，所述叶轮为权利要求1至9任一项所述的叶轮。
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