WO2015100704A1 - 一种开放式水泵的叶轮 - Google Patents

一种开放式水泵的叶轮 Download PDF

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Publication number
WO2015100704A1
WO2015100704A1 PCT/CN2014/001161 CN2014001161W WO2015100704A1 WO 2015100704 A1 WO2015100704 A1 WO 2015100704A1 CN 2014001161 W CN2014001161 W CN 2014001161W WO 2015100704 A1 WO2015100704 A1 WO 2015100704A1
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WIPO (PCT)
Prior art keywords
impeller
shaft
blade
water pump
water
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PCT/CN2014/001161
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English (en)
French (fr)
Inventor
练杨忠
徐慧
朱灯光
郑峰
李帅
茅忠群
诸永定
Original Assignee
宁波方太厨具有限公司
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Application filed by 宁波方太厨具有限公司 filed Critical 宁波方太厨具有限公司
Publication of WO2015100704A1 publication Critical patent/WO2015100704A1/zh

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    • 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
    • F04D29/2261—Rotors specially for centrifugal pumps with special measures
    • F04D29/2277—Rotors specially for centrifugal pumps with special measures for increasing NPSH or dealing with liquids near boiling-point

Definitions

  • the invention relates to a water pump, in particular an impeller of an open water pump.
  • the water pump and the inlet pipe must be filled with water, and then the high-speed rotating impeller is used to obtain the energy of the liquid under the action of the inertial centrifugal force, thereby increasing the internal pressure.
  • the impeller rotates rapidly, the blade causes the water to rotate quickly.
  • the centrifugal force flies out of the impeller, the water in the pump is thrown, the central part of the impeller forms a vacuum area, and then the water of the water source enters the inlet pipe under the action of atmospheric pressure (or water pressure). Continuous circulation can be achieved by circulating.
  • the pump has the advantages of simple structure, easy operation, easy adjustment of flow rate and suitable for transportation of various special materials, it is widely used in various fields, ranging from various industrial places to various household appliances such as washing machines and dishwashers. , air conditioning, etc.
  • a conventional water pump such as the one disclosed in Chinese Patent No. CN1133961A (Application No. 95107436.9), has a suction port at the axial lower end of the impeller, and a discharge port at the upper side, and the impeller is in a closed pump chamber.
  • the above-mentioned impellers are all in a closed space, so that the central portion of the impeller can form a vacuum region, and then the water of the water source can enter the impeller under the action of atmospheric pressure (or water pressure).
  • the suction port is in the same direction as the axis of the impeller, the discharge port is perpendicular to the axis of the impeller, and when the impeller rotates, the water passing through the impeller must have a velocity in the same direction as the axis of the impeller, so that water can smoothly pass from the impeller.
  • the vertical discharge spout of the shaft, the impeller must also be in the closed pump chamber, especially the upper part of the pump chamber must be fixedly sealed, otherwise the water will be sprayed upward from the upper side of the pump chamber, that is, the axis of the impeller is parallel. Or it may cause the upper part to be topped by water.
  • the impeller In the above conventional water pump, the impeller must be in a closed chamber, which is not only complicated in structure but also has high processing requirements. Usually, the chamber must be closed, otherwise it will appear above the chamber, that is, in the direction parallel to the axial direction of the impeller. Leakage unless the outlet is placed parallel to the axial direction of the impeller.
  • an open type water pump such as a dishwasher disclosed in European Patent Publication No. EP 0 807 396 A2, which comprises a washing chamber for accommodating a tray, a spray arm supported at the bottom of the washing chamber, and pumped out a pump that pressurizes the spray arm, the pump includes an impeller, the inner surface of the spray arm defines a housing for the impeller, allowing washing fluid to pass from the housing to the nozzle of the spray arm, the impeller being included at the lower edge
  • the forwardly curved blade has an axial flow blade portion at the bottom of the blade. After the drive motor is started under no load, the axial flow blade portion lifts the fluid, so that the pump performs normal operation.
  • the lower section of the blade is shorter, the blade needs to be at a higher water level when the water is rotated, and the water path of the water is shorter, and it is easy to re-enter the foam formed by the washing water surface washing liquid, food residue, etc. into the impeller.
  • the normal drowning, and the amount of water in the drowning is small, the flow rate is low, and thus the rotating spray arm is positive
  • the usual spray work has an impact.
  • the technical problem to be solved by the present invention is to provide an impeller for an open type water pump having a high water repellency capability in view of the problems of the prior art described above.
  • an impeller of an open water pump including a centrally located shaft and a plurality of axially extending blades uniformly distributed circumferentially on a circumferential surface of the shaft
  • the blade is axially divided into an upper portion and a lower portion which are connected to each other, and is characterized in that: at least a bottom portion of the lower portion of the blade is gradually curved smoothly along a rotation direction of the impeller on a circumferential surface of the shaft, and a lower height of the lower portion of the blade
  • the ratio of the height to the height of the upper section is in the range of 1 to 5.
  • the ratio of the height of the lower section of the blade to the height of the upper section is 3.
  • the ratio of the radial dimension of the upper section to the radial dimension of the lower section of the blade ranges from 1 to 5.
  • the ratio of the radial dimension of the upper section to the radial dimension of the lower section of the blade is 4/3.
  • the upper portion of the blade is perpendicular to the circumferential surface of the shaft, and the lower portion is gradually curved smoothly along the circumferential direction of the impeller on the circumferential surface of the shaft, and the bent portion is twisted in the rotational direction.
  • the upper section of the blade is perpendicular to the circumferential surface of the shaft, and the lower section is gradually curved in an arc shape along the rotation direction of the impeller on the circumferential surface of the shaft.
  • the lower section of the blade is gradually upwardly inclined from an inner side facing away from the shaft toward the inner side of the shaft.
  • the flow of the water flow can be changed from the vertical direction to the lateral direction at the top of the shaft, thereby forming an arc-shaped surface.
  • the water flow acts as a guide so that the water flow can also change the flow direction without sealing the impeller, and the top outer circumference of the shaft is turned radially outward to form a circular arc surface.
  • the top of the blade is also a curved surface, the curved surface of the top of the blade and the curved surface of the top of the shaft The arc is the same.
  • the invention has the advantages that: by setting the upper and lower sections of the blade to a suitable height ratio, the impeller can be drowned at a lower water level, and the foam formed by the washing liquid or food residue on the water surface is not easily formed.
  • the impeller is impregnated to affect the hydrophobic water, and sufficient flow can be drawn from the water inlet; the upper section of the blade is set to have a radial dimension larger than the lower section, so that the water flow is gradually increased during the ascending process, thereby reducing the axial direction.
  • the effect of the upward flow rate; the curved surface is formed on the top surface of the shaft so that the water flow can not only reduce the axial upward flow velocity therein, but also can change from the longitudinal direction to the lateral direction without sealing.
  • FIG. 1 is a schematic front view showing the structure of an impeller according to Embodiment 1 of the present invention.
  • FIG. 2 is a schematic perspective view showing the structure of an impeller according to Embodiment 1 of the present invention.
  • FIG. 3 is a schematic front view showing the structure of an impeller according to a second embodiment of the present invention.
  • FIG. 4 is a schematic perspective structural view of an impeller according to a second embodiment of the present invention.
  • Figure 5 is a schematic front view showing the structure of an impeller according to a third embodiment of the present invention.
  • FIG. 6 is a schematic perspective structural view of an impeller according to a third embodiment of the present invention.
  • Fig. 7 is a cross-sectional view showing a water pump to which an impeller according to a first embodiment of the present invention is applied.
  • the impeller 3 includes a central shaft 31 and a plurality of axially extending vanes 32 uniformly distributed circumferentially on the circumferential surface of the shaft 31, the lower end of the shaft 31 being used for an output shaft of a motor for driving the water pump (not Connected) so that when the motor rotates, the impeller 3 can be driven to rotate.
  • the blade 32 can be divided into two sections in the axial direction, that is, the upper section 321 of the blade 32, and the lower section 322 of the blade 32, and the upper section 321 and the lower section 322 are integrally formed.
  • the upper section 321 of the blade 32 extends along the axial plane of the shaft 31 and at the same time is perpendicular to the outer peripheral surface of the shaft 31, and the lower section 322 of the blade 32 is gradually curved smoothly along the rotation direction of the impeller 3 at least at the bottom on the circumferential surface of the shaft 31, The bent portion is twisted in the bending direction.
  • the arrangement of the vanes 32 is such that when the vanes 32 are rotated, the bottom thereof can lift the water upwards so that water can move from the lower direction of the impeller 3 from the flow passages spaced between the vanes 32, even if the impeller 3 is not In the enclosed space, without the effect of the vacuum, the water can still be drowned, and the water is sent from the bottom to the top as the impeller 3 rotates.
  • the ratio of the height of the lower section 322 and the upper section 321 of the blade 32 is in the range of 1 to 5, and the most preferred ratio is 3, and the lower section 322 of the blade 32 is longer than the upper section 322, and the portion of the hydrophobic portion is longer. This can make the water level of the blade 32 drowning lower, and it is not easy to wind the foam formed by the washing liquid or food residue on the water surface into the impeller 3 to affect the drowning water, and a sufficient flow rate can be drawn from the water inlet.
  • the lower section 322 of the blade 32 is smoothly curved at the bottom, as will be appreciated by those skilled in the art, the bending may also occur throughout the lower section 322, or the entire upper section 321 and the lower section 322, i.e., the entire blade 32, as long as one is formed.
  • a smooth curved flow path can lift the water flow from the bottom end.
  • the upper section 321 of the blade 32 has a larger radial dimension, while the lower section 322 has a smaller radial dimension.
  • the water flow path is gradually widened, which serves to reduce the flow rate.
  • the upper section 321 The radial dimension ratio to the lower section 322 is 1-5, more preferably 4/3.
  • the top outer periphery of the shaft 31 of the impeller 3 is radially outwardly turned to form a circular curved surface 311, so that when the water flow moves from the bottom to the top as the impeller 3 rotates, not only the flow velocity is gradually lowered, but also due to the curved surface 311
  • the flow direction of the water flow can be changed from the vertical direction to the lateral direction at the top of the shaft 31, so that the curved surface 311 serves as a guide for the water flow so that the water flow can change the flow direction without sealing the impeller 3.
  • the top surface of the upper section 321 of the blade 32 may also form an everted curved surface having the same curvature as the arcuate surface 311 at the top of the shaft 31.
  • the impeller of the invention can be used for an open type water pump. Due to its own structure, the water flow can flow from under the impeller and flow laterally from the upper part of the impeller, and the structure is simple and the use effect is good.
  • the open type water pump includes an upper casing 1 and a lower casing 2, and the upper casing 1 and the lower casing 2 are in contact with each other to form an accommodation cavity for placing the impeller 3.
  • An upper receiving cavity 11 is formed in the upper casing 1 for receiving the upper section of the blade
  • a lower receiving cavity 21 is formed in the lower casing 2 for receiving the lower section of the blade.
  • the outer periphery of the lower casing 2 may be formed with a step portion 22, and a portion of the upper casing 1 located around the upper accommodation cavity 11 may rest on the step portion 22 on.
  • the lower portion of the lower casing 2 is open, and the water flow can enter the impeller from the lower side and the side surface of the lower casing 2, that is, the water inlet of the water pump is located below and on the side of the lower casing 2, and the upper casing 1 accommodates the cavity 11
  • the top surface is closed, and the water flows out from the side of the upper receiving cavity 11, that is, the water outlet of the water pump is located on the side of the upper casing 1 that accommodates the cavity 11, as indicated by the arrow in FIG. 7, which is the direction of the water flow. .
  • the end of the lower section of the blade is preferably lower than the bottom surface of the lower receiving cavity 21, i.e., exposed downwardly to the lower receiving cavity 21.
  • the shaft 31 is hollow, and the upper casing 1 has a lower recess 12 at the same position as the top of the shaft 31, which is the same as the arc surface 311 at the top of the shaft 31, thereby causing the impeller 3 to rotate, the top of the shaft 31 and the upper casing.
  • a vacuum region is created between the lower recesses 12 of the 1 such that the top of the shaft 31 produces a downward suction force against the upper casing 1 to attract the upper casing 1.
  • Such a structure allows an additional fixing connection mechanism between the upper casing 1 and the lower casing 2 to connect the two, and it is only necessary to rest the upper casing 1 on the lower casing 2.
  • a pump structure composed of the upper casing 1, the lower casing 2, and the impeller 3 may be connected between the upper casing 1 and the lower casing 2 by a relatively convenient detachable connection mechanism, such as a turn buckle or the like. more stable.
  • FIG. 4 which is a second embodiment of the impeller of the present invention
  • the difference between this embodiment and the first embodiment is that the lower section 322' of the blade 32' gradually smoothes in the direction of rotation of the impeller.
  • the shape is curved, and the lower section 322' and the upper section 321' are both perpendicular to the circumferential surface of the shaft 31.
  • FIG. 6 which is a third embodiment of the impeller of the present invention
  • the difference between this embodiment and the first embodiment is that the lower section 322" of the blade 32" gradually and smoothly bends in the direction of rotation of the impeller.
  • the inner side facing away from the shaft 31 is gradually inclined upward from the inner side surface of the shaft 31, and the upper portion 321" is formed perpendicular to the circumferential surface of the shaft 31, and the lower portion 322" is inclined with the circumferential surface of the shaft 31.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

一种开放式水泵的叶轮（3）包括位于中心的轴（31）和在轴（31）的周面上沿周向均匀分布的多个沿轴向延伸的叶片（32）。叶片（32）在轴向上分为上段（321）和下段（322），叶片（32）的至少下段（322）的底部在轴（31）的周面上沿叶轮的旋转方向逐渐平滑弯曲，叶片（32）的下段（322）高度与上段（321）高度的高度比值的范围为1~5。通过将叶片的上段和下段设置合适的高度比，使得叶轮可以在较低水位汲水，不容易将水表面的洗涤液或食物残渣形成的泡沫卷入叶轮而影响汲水，并且可以从入水口汲取足够的流量。

Description

一种开放式水泵的叶轮 技术领域
本发明涉及一种水泵，尤其是一种开放式水泵的叶轮。
背景技术
水泵在工作前，水泵和进水管必须灌满水，之后依靠高速旋转的叶轮，使液体在惯性离心力的作用下获得能量从而能提高其内压强，当叶轮快速旋转，叶片促使水很快旋转，随着离心力的作用从叶轮中飞出，水泵内的水被抛出后，叶轮的中心部分形成真空区域，之后水源的水在大气压力(或水压)的作用下进入到进水管内，这样循环不已，就可以实现连续抽水。因为水泵具有结构简单、操作容易、流量易于调节且适用于各种特殊性质物料的输送等优点，广泛应用于各个领域，大至各个工业场所，小至各种家用电器，如洗衣机、洗碗机、空调等。
传统的水泵，如中国专利CN1133961A(申请号为95107436.9)所公开的一种排水泵，在叶轮的轴向下端是有吸入口，而在上部侧面设置吐出口，叶轮处于封闭的泵室内。上述的叶轮都处于封闭的空间内，只有这样才能使叶轮的中心部分形成真空区域，之后水源的水在大气压力(或水压)的作用下才能进入叶轮。而且由于吸入口与叶轮的轴同向，吐出口与叶轮的轴垂直，而叶轮在旋转时，经过叶轮的水必定具有与叶轮的轴同向的速度，因此，为了使水能够顺利从与叶轮的轴垂直的吐出口出去，叶轮也必须处于封闭的泵室内，特别是泵室的上方部件必须是固定密封的，否则水会从泵室的上方，即叶轮的轴平行的方向向上喷出，或者可能会使得上方的部件被水顶开。
上述这种传统的水泵，叶轮必须处于封闭的腔室内，不但结构复杂，而且加工要求也较高，通常腔室必须封闭，否则在腔室的上方，即与叶轮的轴向平行的方向都会出现漏水，除非将出口设置成与叶轮的轴向平行。
为此，也已公开了一种开放式的水泵，如公开号为EP0807396A2的欧洲专利公开的一种洗碗机，包括用于容纳盘子的洗涤室，支撑在洗涤室底部的喷射臂，泵出洗涤液对喷射臂加压的泵，泵包括叶轮，喷射臂的内表面限定了用于叶轮的壳体，允许洗涤液从壳体到喷射臂的喷嘴进行传递，叶轮包括在较低的边缘处向前弯曲的叶片，叶片的底部具有轴流式叶片部分，在驱动电机无负载下启动后，轴流式叶片部分将流体抬起，从而泵进行正常工作。然而这种叶轮，其叶片弯曲的下段较短，叶片旋转汲水时需要在较高的水位，出水的水路较短，容易将在清洗用水表面洗涤液、食物残渣等形成的泡沫重新卷入叶轮，影向正常的汲水，并且汲水的水量较少，流速较低，从而会对旋转喷臂正 常的喷淋工作造成影响。
发明内容
本发明所要解决的技术问题是针对上述现有技术存在的问题，提供一种汲水能力强的开放式水泵的叶轮。
本发明解决上述技术问题所采用的技术方案为：一种开放式水泵的叶轮，所述叶轮包括位于中心的轴和在轴的周面上沿周向均匀分布的多个沿轴向延伸的叶片，所述叶片在轴向上分为相互连接的上段和下段，其特征在于：所述叶片的至少下段的底部在轴的周面上沿叶轮的旋转方向逐渐平滑弯曲，所述叶片的下段高度与上段高度的高度比值的范围为1～5。
优选的，所述叶片的下段高度与上段高度的高度比值为3。
为了在水流从叶轮底部向上时，水的流道逐渐增宽，起到了一个降低流速的作用，所述叶片的上段径向尺寸与下段径向尺寸的径向尺寸比值的范围为1～5。
优选的，所述叶片的上段径向尺寸与下段径向尺寸的径向尺寸比为4/3。
在本发明的一个实施例中，所述叶片的上段与轴的周面垂直，下段在轴的周面上沿叶轮的旋转方向逐渐平滑弯曲，并且弯曲的部分在旋转方向上扭曲。
在本发明的另一个实施例中，所述叶片的上段与轴的周面垂直，下段在轴的周面上沿叶轮的旋转方向逐渐平滑呈弧形状弯曲。
在本发明的另一个实施例中，所述叶片的下段由靠近轴的内侧面向远离轴的外侧面逐渐向上倾斜。
为了在水流随着叶轮的旋转由底部向顶部运动时，不仅流速逐渐降低，而且由于弧形面的作用，水流的流向可以从垂直方向，在轴的顶部时变成横向，从而弧形面对水流起到导向的作用，使得水流在不密封叶轮的情况下也可以改变流向，所述轴的顶部外周径向向外翻转形成一圈弧形面。
为了与轴的顶部的弧形面配合，更好的对水流起到导向的作用，所述叶片的顶部也为一弧形面，所述叶片顶部的弧形面与轴顶部的弧形面的弧度相同。
与现有技术相比，本发明的优点在于；通过将叶片的上段和下段设置合适的高度比，使得叶轮可以在较低水位汲水，不容易将水表面的洗涤液或食物残渣形成的泡沫卷入叶轮而影响汲水，并且可以从入水口汲取足够的流量；将叶片的上段设置成径向尺寸大于下段，可以使得水流在上升的过程中，流道逐渐增宽，起到了降低轴向向上流速的作用；在轴的顶面外翻形成有弧形面，使得水流不仅可以在此降低轴向向上流速，而且可以在不密封的情况下也能由纵向改变成横向。
附图说明
图1为本发明实施例一的叶轮的正面结构示意图；
图2为本发明实施例一的叶轮的立体结构示意图；
图3为本发明实施例二的叶轮的正面结构示意图；
图4为本发明实施例二的叶轮的立体结构示意图；
图5为本发明实施例三的叶轮的正面结构示意图；
图6为本发明实施例三的叶轮的立体结构示意图；
图7为本发明实施例一的叶轮所应用的水泵的剖视图。
具体实施方式
以下结合附图实施例对本发明作进一步详细描述。
实施例一
如图1和图2所示，为本发明的开放式水泵的叶轮的实施例一。该叶轮3包括中心的轴31和在轴31的周面上沿周向均匀分布的多个沿轴向延伸的叶片32，轴31的下端用于与用于驱动水泵的电机的输出轴(未示出)连接，从而当电机旋转时，可驱动叶轮3旋转。
叶片32在轴向上可以分为两段，即叶片32的上段321，和叶片32的下段322，上段321和下段322一体成型。
叶片32的上段321沿轴31的轴平面延伸，并且同时与轴31的外周面垂直，叶片32的下段322至少在底部在轴31的周面上沿着叶轮3的旋转方向逐渐平滑弯曲，同时该弯曲的部分在弯曲方向上扭曲。
叶片32这样的设置，可以使得当叶片32旋转时，其底部可以将水向上抬起，使得水可以从叶片32之间间隔出的流道从叶轮3的下方向上方运动，即使叶轮3不处于封闭的空间内，没有真空的作用，仍然能够汲水，随着叶轮3的旋转将水从底部送至顶部。
在本发明中，叶片32的下段322和上段321高度的比值范围在1～5之内，最优选的比值为3，叶片32的下段322相对上段322较长，汲水的部位较长，由此可以使得叶片32汲水的水位较低，不容易将水表面的洗涤液或食物残渣形成的泡沫卷入叶轮3而影响汲水，并且可以从入水口汲取足够的流量。
在上文中，叶片32的下段322的在底部呈平滑弯曲，本领域技术人员可了解到，该弯曲也可以发生在整个下段322，或整个上段321和下段322，即整个叶片32，只要形成一平滑弯曲的流道能够对水流从最底端向上抬起即可。
叶片32的上段321径向尺寸较大，而下段322的径向尺寸较小，当水流从叶轮3底部向上时，水的流道逐渐增宽，起到了一个降低流速的作用。在本实施例中，上段321 和下段322的径向尺寸比为1-5，更优选的为4/3。
叶轮3的轴31的顶部外周径向向外翻转形成一圈弧形面311，因此，当水流随着叶轮3的旋转由底部向顶部运动时，不仅流速逐渐降低，而且由于弧形面311的作用，水流的流向可以从垂直方向，在轴31的顶部时变成横向，从而弧形面311对水流起到导向的作用，使得水流在不密封叶轮3的情况下也可以改变流向。
在本实施例中，叶片32的上段321的顶面也可以形成一外翻的弧形面，其弧度与轴31顶部的弧形面311的弧度相同。
术发明的叶轮可以用于开放式水泵，由于其自身的结构，就可以使得水流从叶轮下方流入，从叶轮上部横向流出，结构简单，使用效果好。
如图7所示，开放式的水泵包括上壳体1和下壳体2，上壳体1和下壳体2互相接触形成一容置空腔以用于放置叶轮3。
上壳体1中形成有一上容置空腔11，用于容置叶片的上段，下壳体2中形成有一下容置空腔21，用于容置叶片的下段。上壳体1和下壳体2之间不必密封连接，如，下壳体2的外周可形成有台阶部22，上壳体1位于上容置空腔11周围的部分可以搁置于台阶部22上。
下壳体2的下方敞开，水流可以从下壳体2的下方和侧面进入到叶轮，即水泵的入水口位于下壳体2的下方和侧面，上壳体1的相对上容置空腔11的顶面封闭，水流从上容置空腔11的侧面流出，即水泵的出水口位于上壳体1内上容置空腔11的侧面，如图7中的箭头所示，即为水流方向。
叶片的下段的末端优选的低于下容置空腔21的底面，即向下露出于下容置空腔21。
轴31为中空，上壳体1与轴31顶部相应的位置具有与轴31顶部的弧形面311弧度相同的下凹部12，由此使得叶轮3在旋转时，轴31的顶部和上壳体1的下凹部12之间产生一真空区域，使得轴31的顶部对上壳体1产生一向下的吸力，将上壳体1吸住。
这样的结构使得上壳体1和下壳体2之间不需要额外的固定连接机构将两者连接，只需要将上壳体1搁置于下壳体2之上即可。
或者，上壳体1和下壳体2之间也可以采用较为方便的可拆卸连接机构将两者连接，如旋扣等，使得上壳体1、下壳体2以及叶轮3组成的水泵结构更加稳定。
实施例二
如图3和图4，为本发明的叶轮的第二个实施例，本实施例与上述实施例一的不同之处在于：叶片32’的下段322’在叶轮的旋转方向上逐渐平滑呈弧形状弯曲，下段322’和上段321’均与轴31的周面垂直。
实施例三
参见图5和图6，为本发明的叶轮的第三个实施例，本实施例与上述实施例一的不同之处在于：叶片32”的下段322”在叶轮的旋转方向上逐渐平滑弯曲，同时由靠近轴31的内侧面向远离轴31的外侧面遂渐向上倾斜，形成上段321”与轴31的周面垂直，下段322”与轴31的周面倾斜。

Claims (9)

  1. 一种开放式水泵的叶轮，所述叶轮(3)包括位于中心的轴(31)和在轴(31)的周面上沿周向均匀分布的多个沿轴向延伸的叶片，所述叶片在轴向上分为相互连接的上段和下段，其特征在于：所述叶片的至少下段的底部在轴(31)的周面上沿叶轮的旋转方向逐渐平滑弯曲，所述叶片的下段高度与上段高度的高度比值的范围为1～5。
  2. 如权利要求1所述的开放式水泵的叶轮，其特征在于：所述叶片的下段高度与上段高度的高度比值为3。
  3. 如权利要求1所述的开放式水泵的叶轮，其特征在于：所述叶片的上段径向尺寸与下段径向尺寸的径向尺寸比值的范围为1～5。
  4. 如权利要求3所述的开放式水泵的叶轮，其特征在于：所述叶片的上段径向尺寸与下段径向尺寸的径向尺寸比为4/3。
  5. 如权利要求1所述的开放式水泵的叶轮，其特征在于：所述叶片的上段与轴(31)的周面垂直，下段在轴(31)的周面上沿叶轮的旋转方向逐渐平滑弯曲，并且弯曲的部分在旋转方向上扭曲。
  6. 如权利要求1所述的开放式水泵的叶轮，其特征在于：所述叶片的上段与轴(31)的周面垂直，下段在轴(31)的周面上沿叶轮的旋转方向逐渐平滑呈弧形状弯曲。
  7. 如权利要求6所述的开放式水泵的叶轮，其特征在于：所述叶片的下段由靠近轴(31)的内侧面向远离轴(31)的外侧面逐渐向上倾斜。
  8. 如权利要求1所述的开放式水泵的叶轮，其特征在于：所述轴(31)的顶部外周径向向外翻转形成一圈弧形面(311)。
  9. 如权利要求8所述的开放式水泵的叶轮，其特征在于：所述叶片的顶部也为一弧形面，所述叶片顶部的弧形面与轴(31)顶部的弧形面(311)的弧度相同。
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