Impeller, centrifugal and electric pumps

Abstract

An impeller includes a support portion and multiple blades, the multiple blades include a first blade and a second blade, the second blade is arranged between two adjacent first blades; the first blade includes a first side surface and a second side surface, the first side surface includes a first arc surface and a second arc surface, the center of the first arc surface and the center of the second arc surface are located on both sides of the first blade, the second side surface includes a third arc surface and a fourth arc surface, the center of the third arc surface and the center of the fourth arc surface are located on both sides of the first blade; the second blade includes a third side surface and a fourth side surface, the third side surface includes a fifth arc surface and a sixth arc surface, the center of the fifth arc surface and the center of the sixth arc surface are located on both sides of the second blade, the fourth side surface includes a seventh arc surface and an eighth arc surface, the center of the seventh arc surface and the center of the eighth arc surface are located on both sides of the second blade; this is conducive to improving the hydraulic efficiency of the pump.

Description

Technical field

[0001] The present invention relates to a fluid pump, in particular to an impeller and a pump using the impeller. [Background Technology]

[0002] In recent decades, centrifugal pumps, especially electric-driven centrifugal pumps, have been widely used in thermal circulation systems and can well meet market demand.

[0003] A centrifugal pump includes an impeller, which is a core component of the centrifugal pump. The structure of the impeller will directly affect the hydraulic efficiency of the pump. Therefore, how to optimize the structure of the impeller to improve the hydraulic efficiency of the pump is an important factor to be considered when designing the impeller structure. [Summary of the invention]

[0004] The object of the present invention is to provide an impeller, a centrifugal pump and an electric pump, which are beneficial to improving the hydraulic efficiency of the pump.

[0005] To achieve the above object, one embodiment of the present invention adopts the following technical solution:

[0006] An impeller, comprising a support portion and a plurality of blades, characterized in that: the plurality of blades include a first blade and a second blade, the length of the first blade is greater than the length of the second blade, the first blade and the second blade are distributed in a circumferential array along the support portion, and the second blade is arranged between adjacent first blades; the first blade includes a first side surface and a second side surface, the first side surface is a pressure surface, and the second side surface is a back pressure surface;

[0007] The first side surface includes at least a first curved surface and a second curved surface, the first curved surface and the second curved surface are smoothly connected, the first curved surface is convex, the second curved surface is concave, and the first curved surface is closer to the center of the impeller than the second curved surface; a first plane is defined, the first plane is perpendicular to the central axis of the impeller, and the impeller is projected onto the first plane. The center of the projection of the first curved surface is located on one side of the projection of the first blade, and the center of the projection of the second curved surface is located on the other side of the projection of the first blade;

[0008] The second side surface includes at least a third curved surface and a fourth curved surface, the third curved surface is smoothly connected to the fourth curved surface, the third curved surface is concave, and the fourth curved surface is convex. The third curved surface is closer to the center of the impeller than the fourth curved surface. When the impeller is projected onto the first plane, the center of the projection of the third curved surface is located on one side of the projection of the first blade, and the center of the projection of the fourth curved surface is located on the other side of the projection of the first blade.

[0009] The impeller is projected onto the first plane, and the center of the first arc surface projection of the first side surface and the center of the third arc surface projection of the second side surface are located on one side of the first blade projection, and the center of the second arc surface projection of the first side surface and the center of the fourth arc surface projection of the second side surface are located on the other side of the first blade projection;

[0010] The second blade includes a third side surface and a fourth side surface, the third side surface is a pressure surface, the fourth side surface is a back pressure surface, and the third side surface is arranged between the second side surface of the first blade and the fourth side surface of the second blade;

[0011] The third side surface includes at least a fifth arc surface and a sixth arc surface, the fifth arc surface is smoothly connected to the sixth arc surface, the fifth arc surface is closer to the center of the impeller than the sixth arc surface, and the center of the projection of the impeller onto the first plane is located on one side of the projection of the second blade, and the center of the projection of the sixth arc surface is located on the other side of the projection of the second blade;

[0012] The fourth side surface includes at least a seventh arc surface and an eighth arc surface, the seventh arc surface is smoothly connected to the eighth arc surface, the seventh arc surface is closer to the center of the impeller than the eighth arc surface, and the center of the projection of the impeller onto the first plane is located on one side of the projection of the second blade, and the center of the projection of the eighth arc surface is located on the other side of the projection of the second blade;

[0013] The impeller is projected onto the first plane, and the center of the fifth arc surface projection of the third side surface and the center of the seventh arc surface projection of the fourth side surface are located on one side of the second blade projection, and the center of the sixth arc surface projection of the third side surface and the center of the eighth arc surface projection of the fourth side surface are located on the other side of the second blade projection;

[0014] For the second blade, the center of the fifth arc surface projection of the third side surface and the center of the seventh arc surface projection of the fourth side surface are arranged closer to the fourth side surface than the third side surface, and the center of the sixth arc surface projection of the third side surface and the center of the eighth arc surface projection of the fourth side surface are arranged closer to the third side surface than the fourth side surface.

[0015] A centrifugal pump comprises an impeller, wherein the impeller comprises the impeller described above.

[0016] An electric pump includes a rotor assembly and a stator assembly. The rotor assembly includes an impeller and a rotor. The impeller includes the impeller described above.

[0017] The impeller of the present invention includes a first blade and a second blade, the first blade includes a first side surface and a second side surface, the first side surface includes a first arc surface and a second arc surface, the first arc surface is a convex surface, the second arc surface is a concave surface, the center of the first arc surface and the center of the second arc surface are located on both sides of the first blade, the second side surface includes a third arc surface and a fourth arc surface, the third arc surface is a concave surface, the fourth arc surface is a convex surface, the center of the third arc surface and the center of the fourth arc surface are located on both sides of the first blade; the second blade includes a third side surface and a fourth side surface, the third side surface includes a fifth arc surface and a sixth arc surface, the center of the fifth arc surface and the center of the sixth arc surface are located on both sides of the second blade, the fourth side surface includes a seventh arc surface and an eighth arc surface, the center of the seventh arc surface The center of the eighth arc surface is located on both sides of the second blade; this arrangement makes the centers of the arc surfaces of the first side surface and the second side surface of the first blade distributed on different sides of the first blade, and the centers of the arc surfaces of the third side surface and the fourth side surface of the second blade are distributed on different sides of the second blade, so that the first blade and the second blade are in a concave and convex arc shape. On the one hand, this can balance the dynamic pressure and static pressure when the impeller is working, thereby helping to improve the head of the pump with the above-mentioned impeller, thereby helping to improve the hydraulic efficiency of the pump; on the other hand, it can play a certain diversion role at the tail of the blade, which is conducive to reducing the hydraulic loss of the pump with the above-mentioned impeller, thereby helping to improve the hydraulic efficiency of the pump with the above-mentioned impeller.

[0018] The present invention also discloses a centrifugal pump comprising the impeller, which is beneficial to improving the hydraulic efficiency of the centrifugal pump.

[0019] The present invention also discloses an electric pump comprising the impeller, which is beneficial to improving the hydraulic efficiency of the electric pump.

Brief Description of the Drawings

[0020] Figure 1 1 is a schematic cross-sectional view of an electric pump according to an embodiment of the present invention;

[0021] Figure 2 yes Figure 1 A schematic perspective structural diagram of a first embodiment of the rotor assembly shown;

[0022] Figure 3 yes Figure 2 A schematic cross-sectional view of the rotor assembly shown;

[0023] Figure 4 yes Figure 2 A schematic diagram of a three-dimensional structure of an impeller in a rotor assembly shown in one direction;

[0024] Figure 5 yes Figure 2 A schematic diagram of a three-dimensional structure of the impeller in the rotor assembly shown in another direction;

[0025] Figure 6yes Figure 4 or Figure 5 A schematic diagram of a cross-sectional structure of an impeller shown;

[0026] Figure 7 yes Figure 4 or Figure 5 A schematic diagram of the front view of the impeller shown;

[0027] Figure 8 yes Figure 7 The impeller shown is a schematic diagram of the structure with an identified circumference;

[0028] Figure 9 for Figure 8 A partial enlarged structural diagram of the impeller A portion is shown;

[0029] Figure 10 yes Figure 1 A schematic perspective structural diagram of a second embodiment of the rotor assembly shown;

[0030] Figure 11 yes Figure 10 A schematic diagram of a three-dimensional structure of an impeller in a rotor assembly shown in one direction;

[0031] Figure 12 yes Figure 10 A schematic diagram of a three-dimensional structure of the impeller in the rotor assembly shown in another direction;

[0032] Figure 13 yes Figure 11 or Figure 12 A schematic diagram of a cross-sectional structure of an impeller shown;

[0033] Figure 14 yes Figure 11 or a three-dimensional structural diagram of the first part shown in 12;

[0034] Figure 15 yes Figure 14 A front view schematic diagram of the structure of the first part shown;

[0035] Figure 16 yes Figure 11 or a schematic diagram of a three-dimensional structure of the second part in one direction shown in 12;

[0036] Figure 17 yes Figure 11 or a schematic diagram of a three-dimensional structure of the second part shown in 12 in another direction;

[0037] Figure 18 yes Figure 16 or Figure 17 A front view schematic diagram of the structure of the second part shown;

[0038] Figure 19 yes Figure 1 A schematic perspective structural diagram of a third embodiment of the rotor assembly shown;

[0039] Figure 20 yes Figure 19 A three-dimensional structural diagram of the impeller shown;

[0040] Figure 21 yes Figure 20 A schematic diagram of the front view of the impeller shown;

[0041] Figure 22 yes Figure 21 A partial enlarged structural diagram of the impeller B portion is shown;

[0042] Figure 23 yes Figure 1 A schematic perspective structural diagram of a fourth embodiment of the rotor assembly shown;

[0043] Figure 24 yes Figure 23 A three-dimensional structural diagram of the impeller shown;

[0044] Figure 25 yes Figure 24 A schematic diagram of the three-dimensional structure of the first part shown;

[0045] Figure 26 yes Figure 24 A schematic diagram of the three-dimensional structure of the second part is shown. [Specific implementation method]

[0046] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0047] Generally, centrifugal pumps generally include mechanical centrifugal pumps and electric centrifugal pumps. Centrifugal pumps include an impeller and a driving source for driving the impeller. The driving source of the mechanical centrifugal pump is mechanical movement, which drives the impeller to rotate through mechanical movement. The driving source of the electric-driven centrifugal pump is electricity. Specifically, the electric-driven centrifugal pump includes a magnetic rotor, which drives the impeller to rotate. The centrifugal pump of the present invention is mainly used in the automotive field, mainly to provide flow power for the working medium of the automotive thermal management system. The electric-driven centrifugal pump (hereinafter referred to as the electric pump) is described below. Of course, the specific implementation of the electric-driven centrifugal pump (hereinafter referred to as the electric pump) is also applicable to the mechanical centrifugal pump.

[0048] See also Figure 1The electric pump 100 includes a pump housing, a rotor assembly 3, a stator assembly 4, a pump shaft 5 and an electric control board 9. The pump housing includes a first housing 1, a second housing 2 and a bottom cover 6. The first housing 1, the second housing 2 and the bottom cover 6 are relatively fixedly connected. The pump housing can form a pump cavity. In this embodiment, a first annular sealing ring 10 is provided at the connection between the first housing 1 and the second housing 2. The structure of the first annular sealing ring 10 can prevent the working medium from leaking out at the connection between the first housing 1 and the second housing 2, and can also prevent the external medium from penetrating into the pump cavity. The electric pump 100 also includes an isolation sleeve 7. The isolation sleeve 7 The pump cavity is divided into a first cavity 30 and a second cavity 40. The working medium can flow through the first cavity 30, and no working medium flows through the second cavity 40. The rotor assembly 3 is arranged in the first cavity 30. The rotor assembly 3 includes a rotor 31 and an impeller 32. The impeller 32 is partially located in the isolation sleeve 7. The stator assembly 4 and the electronic control board 9 are arranged in the second cavity 40. The stator assembly 4 is electrically connected to the electronic control board 9. In this embodiment, a second annular sealing ring 20 is further provided between the isolation sleeve 7 and the stator assembly 4. The structure of the second annular sealing ring 20 can form a second line of defense to further prevent external media and working media from penetrating into the second cavity 40.

[0049] See also Figure 1 In this embodiment, the first housing 1 is an injection-molded part having an inlet 11 and an outlet (not shown in the figure). When the electronic pump 100 is operating, the working medium enters the first chamber 30 through the inlet 11 and then leaves the first chamber 30 through the outlet. When the electronic pump 100 is operating, a connector (not shown in the figure) is inserted into the socket 8 of the electronic pump 100 to connect the control circuit on the electronic control board 9 to the external power supply. The control circuit controls the current passing through the stator assembly 4 to change according to a certain rule, thereby controlling the stator assembly 4 to generate a changing magnetic field. The rotor 31 of the rotor assembly 3 rotates around the pump shaft 5 under the action of the magnetic field, causing the working medium entering the first chamber 30 to undergo centrifugal motion along with the rotor 31. The working medium leaves the first chamber 30 due to the centrifugal force, generating flow power.

[0050] Generally, electric pumps include inner rotor type and outer rotor type. An inner rotor electric pump refers to an electric pump with the pump shaft as the center axis, and the rotor of the rotor assembly is arranged closer to the pump shaft than the stator assembly. An outer rotor electric pump refers to an electric pump with the pump shaft as the center axis, and the stator assembly is arranged closer to the pump shaft than the rotor of the rotor assembly. In this example, the electric pump 100 is an inner rotor electric pump. The specific implementation of the electric pump of the present invention will be introduced below. The specific implementation of the electric pump of the present invention is also applicable to outer rotor electric pumps.

[0051] The structures of four embodiments of the rotor assembly are explained below; for the convenience of describing the rotor assemblies of the four embodiments, the rotor assembly of the first embodiment is marked as rotor assembly 3, and other numbers are not suffixed; the rotor assembly of the second embodiment is marked as rotor assembly 3a, and other numbers are suffixed with a; the rotor assembly of the third embodiment is marked as rotor assembly 3b, and other numbers are suffixed with b; the rotor assembly of the fourth embodiment is marked as rotor assembly 3c, and other numbers are suffixed with c.

[0052] See also Figure 2 , Figure 2 and Figure 3 is a schematic structural diagram of a first embodiment of a rotor assembly, Figures 4 to 9 for Figure 2 The structure diagram of the impeller is shown in FIG. 1 , and the structure of the first embodiment of the rotor assembly is described below.

[0053] See also Figure 2 and Figure 3 The rotor assembly 3 includes a rotor 31 and an impeller 32, combined with Figure 1 The impeller 32 is arranged closer to the inlet 11 of the electric pump than the rotor 31. In this embodiment, the rotor assembly 3 further includes a first sleeve 33 and a second sleeve 34. The first sleeve 33 is arranged closer to the impeller 32 than the second sleeve 34. The first sleeve 33 and the second sleeve 34 are coaxially arranged. Figure 1 The first sleeve 33 and the second sleeve 34 are sleeved on Figure 1 The outer periphery of the pump shaft 5 in this embodiment, the first sleeve 33, the second sleeve 34 and the pump shaft 5 are clearance-matched, so that the rotor assembly 3 can surround Figure 1 The pump shaft 5 in the pump assembly rotates; the rotor assembly 3 also includes a sleeve 35, which is arranged on the outer periphery of the first sleeve 33 and the second sleeve 34. The sleeve 35 can provide support for the first sleeve 33 and the second sleeve 34. In this embodiment, the sleeve 35 is tightly fitted with the first sleeve 33, and the sleeve 35 is tightly fitted with the second sleeve 34, thereby ensuring that the first sleeve 33 and the second sleeve 34 will not fall off; in this embodiment, the rotor 31 is sleeved on the outer periphery of the sleeve 35, and the impeller 32 is fixedly connected to the sleeve 35. Specifically, the connecting portion of the impeller is tightly fitted with the sleeve 35. The specific introduction to the connecting portion of the impeller is shown below.

[0054] See also Figures 4 to 6The impeller 32 includes a support portion 36 and a plurality of blades 37, wherein the plurality of blades 37 include a first blade 371 and a second blade 372. For ease of description, a first plane is introduced, wherein the first plane is perpendicular to the central axis of the impeller, and the central axis of the impeller is substantially coaxial with the central axis of the rotor assembly. Here, “substantially coaxial” means that the coaxiality is within 1 mm. In this embodiment, the length of the first blade 371 is greater than the length of the second blade 372. Here, “the length of the first blade 371 and the length of the second blade 372” refers to the projection of the impeller 32 onto the first plane, along the projection of the first blade 371 and the second blade 372. The length of the trajectory measured by the shape trajectory of the shadow; the first blade 371 and the second blade 372 are distributed in a circular array along the support portion 36, and the second blade 372 is arranged between adjacent first blades 371; in this embodiment, the first blade 371 and the support portion 36 are integrally injection molded; the impeller 32 also includes a boss portion 38, which protrudes from the support portion 36 in the direction away from the blade 37, and the outer circumferential diameter of the boss portion 38 is smaller than the outer circumferential diameter of the support portion 36. This arrangement can avoid the boss portion interfering with the assembly of the rotor assembly; the impeller 32 also includes a connecting portion 381, which is formed with a connecting hole, combined with Figure 3 , at least in part Figure 3 The sleeve 35 is arranged in the above-mentioned connecting hole, and the connecting portion 381 is tightly matched with the outer periphery of part of the sleeve 35, thereby ensuring the reliability of the connection between the impeller and the sleeve. Figure 4 The impeller 32 also includes an impeller inlet 321 and an impeller outlet 322. The impeller inlet 321 is used for the inflow of fluid, and the impeller outlet 322 is used for the outflow of fluid. Specifically, in this embodiment, the head of the first blade 371 is surrounded by the impeller inlet 321, and a plurality of impeller outlets 322 are formed at the outer edge of the support portion 36 between two adjacent blades. An impeller channel is formed between two adjacent blades, and the impeller channel connects the impeller inlet 321 and the impeller outlet 322.

[0055] See also Figure 4 and Figure 7The first blade 371 includes a first side surface 3711 and a second side surface 3712. The first side surface 3711 and the second side surface 3712 are arranged opposite to each other. The first side surface 3711 is a pressure surface, and the second side surface 3712 is a back-pressure surface. The "pressure surface and back-pressure surface" here refer to that when the electric pump is working, the working pressure of the pressure surface is usually greater than the working pressure of the back-pressure surface. In this embodiment, in order to clearly mark them, they are marked on the two first blades. In fact, each blade includes a first side surface 3711 and a second side surface 3712; the first side surface 3711 includes at least the first side surface 3711 and the second side surface 3712. A curved surface 3713 and a second curved surface 3714, the first curved surface 3713 is a convex surface, the second curved surface 3714 is a concave surface, the first curved surface 3713 and the second curved surface 3714 are smoothly connected, so as to ensure that there is no sharp corner at the connection between the first curved surface 3713 and the second curved surface 3714, thereby avoiding stress concentration, the first curved surface 3713 is closer to the center of the impeller 32 than the second curved surface 3714, and the impeller 32 is projected onto the first plane. The center O1 of the projection of the first curved surface is located on one side of the projection of the first blade 371, and is aligned with the center O2 of the projection of the second curved surface. Located on the other side of the projection of the first blade 371; the second side surface 3712 includes at least a third curved surface 3715 and a fourth curved surface 3716, the third curved surface 3715 is a concave surface, and the fourth curved surface 3716 is a convex surface. The third curved surface 3715 and the fourth curved surface 3716 are smoothly connected, so as to ensure that there is no sharp corner at the connection between the third curved surface 3715 and the fourth curved surface 3716, thereby avoiding stress concentration. The third curved surface 3715 is closer to the center of the impeller 32 than the fourth curved surface 3716. When the impeller 32 is projected onto the first plane, the third curved surface 3715 is projected onto the The center O1 of the shadow and the center O2 of the fourth arc surface projection are located on both sides of the projection of the first blade 371; the impeller 32 is projected onto the first plane, and the center of the projection of the first arc surface 3713 of the first side surface 3711 and the center of the projection of the third arc surface 3715 of the second side surface 3712 are located on one side of the projection of the first blade 371, and the center of the projection of the second arc surface 3714 of the first side surface 3711 and the center of the projection of the fourth arc surface 3716 of the second side surface 3712 are located on the other side of the projection of the first blade; this arrangement makes the shape of the first blade a concave and convex arc.

[0056] See also Figure 4 and Figure 7The second blade 372 includes a third side surface 3721 and a fourth side surface 3722. The third side surface 3721 and the fourth side surface 3722 are arranged opposite to each other. The third side surface 3721 is a pressure surface, and the fourth side surface 3712 is a back-pressure surface. The "pressure surface and back-pressure surface" here refer to that when the electric pump is working, the working pressure of the pressure surface is usually greater than the working pressure of the back-pressure surface; the third side surface 3721 is arranged between the second side surface 3712 of the first blade 371 and the fourth side surface 3722 of the second blade 372; the third side surface 3721 includes at least The fifth arc surface 3723 and the sixth arc surface 3724 are bracketed, and the fifth arc surface 3723 and the sixth arc surface 3724 are smoothly connected to each other, so as to ensure that there is no sharp corner at the connection between the fifth arc surface 3723 and the sixth arc surface 3724, thereby avoiding stress concentration. The fifth arc surface 3723 is closer to the center of the impeller 32 than the sixth arc surface 3724. When the impeller 32 is projected onto the first plane, the center O3 of the projection of the fifth arc surface 3723 is located on one side of the projection of the second blade 372, and the center O4 of the projection of the sixth arc surface 3724 is located on the side of the second blade 372. The other side of the projection; the fourth side surface 3722 includes at least a seventh arc surface 3725 and an eighth arc surface 3726, and the seventh arc surface 3725 and the eighth arc surface 3726 are smoothly connected, so as to ensure that there is no sharp angle at the connection between the seventh arc surface 3725 and the eighth arc surface 3726, thereby avoiding stress concentration. The seventh arc surface is closer to the center of the impeller than the eighth arc surface. When the impeller is projected onto the first plane, the center O3 of the projection of the seventh arc surface 3725 is located on one side of the projection of the second blade 372, and the center O4 of the projection of the eighth arc surface 3726 is located on the other side of the projection of the second blade 372. On the other side of the projection of the second blade 372; the impeller 32 is projected onto the first plane, and the center O3 of the projection of the fifth arc surface 3723 of the third side surface 3721 and the center O3 of the projection of the seventh arc surface 3725 of the fourth side surface 3722 are located on one side of the projection of the second blade 372, and the center O4 of the projection of the sixth arc surface 3724 of the third side surface 3721 and the center O4 of the projection of the eighth arc surface 3726 of the fourth side surface 3722 are located on the other side of the projection of the second blade 372; this arrangement makes the shape of the second blade a concave and convex arc. For the second blade 372, the center O4 of the projection of the fifth arc surface 3723 of the third side surface 3721 and the center O4 of the projection of the seventh arc surface 3725 of the fourth side surface 3722 are arranged closer to the fourth side surface 3722 than the third side surface 3721, and the center O3 of the projection of the sixth arc surface 3724 of the third side surface 3721 and the center of the projection of the eighth arc surface 3726 of the fourth side surface 3722 are arranged closer to the third side surface 3721 than the fourth side surface 3722.

[0057] In this embodiment, through the above arrangement, the centers of the arc surfaces of the first side surface 3711 and the second side surface 3712 of the first blade 371 are distributed on different sides of the first blade 371, and the centers of the arc surfaces of the third side surface 3721 and the fourth side surface 3722 of the second blade 372 are distributed on different sides of the second blade 372, so that the first blade and the second blade are in a concave and convex arc shape. On the one hand, this can balance the dynamic pressure and static pressure when the impeller is working, thereby helping to improve the head of the pump with the above-mentioned impeller, thereby helping to improve the hydraulic efficiency of the pump; on the other hand, it can play a certain diversion role at the tail of the blade, which is helpful to reduce the hydraulic loss of the pump with the above-mentioned impeller, thereby helping to improve the hydraulic efficiency of the pump with the above-mentioned impeller.

[0058] See also Figure 7 , project the impeller onto the first plane. For the first blade 371, the first arc surface 3713 of the first side surface 3711 is convex, the second arc surface 3714 of the first side surface 3711 is concave, the third arc surface 3715 of the second side surface 3712 is concave, and the fourth arc surface 3716 of the second side surface 3712 is convex. The center of the projection of the first arc surface 3713 of the first side surface coincides with the center of the projection of the third arc surface 3715 of the second side surface, that is, the center of the projection of the first arc surface 3713 and the center of the projection of the third arc surface 3715 are both O1. The center of the projection of the second arc surface 3714 of the first side surface coincides with the center of the projection of the fourth arc surface 3716 of the second side surface, that is, the second arc The center of the projection of surface 3714 and the center of the projection of the fourth arc surface 3716 are both O2; when the impeller 32 is projected onto the horizontal plane, for the second blade 372, the center of the projection of the fifth arc surface 3723 on the third side coincides with the center of the projection of the seventh arc surface 3725 on the fourth side, that is, the center of the projection of the fifth arc surface 3723 and the center of the projection of the seventh arc surface 3725 are both O3, and the center of the projection of the sixth arc surface 3724 on the third side coincides with the center of the projection of the eighth arc surface 3726 on the fourth side, that is, the center of the projection of the sixth arc surface 3724 and the center of the projection of the eighth arc surface 3726 are both O4; the "coincidence" here means that the center-to-center distance between the two circles is within 1 mm.

[0059] See also Figure 4 The first blade 371 includes a first tail portion 373 and a first head portion 374. The first tail portion 373 is closer to the outer periphery of the impeller 32 than the first head portion 374. The second blade 372 includes a second tail portion 375 and a second head portion 376. The second tail portion 375 is closer to the outer periphery of the impeller 32 than the second head portion 376. Figure 4 and Figure 7, project the impeller 32 onto the first plane, and define the circumference where the projection of the outer edge of the support portion 36 lies as the first circumference D1. In this embodiment, the projection of the first tail portion 373 of the first blade coincides with part of the first circumference D1, and the projection of the second tail portion 375 of the second blade coincides with part of the first circumference D1.

[0060] See also Figure 4 and Figure 7 , project the impeller 32 onto the first plane, the diameter of the first circle D1 is the first diameter Φ1, the circumference where the projection of the second head 376 of the second blade 372 is located is the ninth circle D9, the diameter of the second circle D9 is the second diameter Φ2, and the second diameter Φ2 is 0.6 to 0.7 times the first diameter Φ1.

[0061] See also Figure 4 and Figure 8 , project the impeller 32 onto the first plane, define the circumference where the projection of the first head 374 of the first blade 371 is located as the base circumference D0, define the distance between the base circumference D0 and the first circumference D1 as the first distance, divide the first distance into eight equal parts, and obtain the second circumference D2, the third circumference D3, the fourth circumference D4, the fifth circumference D5, the sixth circumference D6, the seventh circumference D7, and the eighth circumference D8. In the projection of the first blade 371, define the center line of the first blade located between the fifth circumference D5 and the seventh circumference D7 as the first arc The center line of the first blade between the seventh circle D7 and the eighth circle D8 is defined as the second arc The center line of the first blade located between the eighth circle D8 and the first circle D1 is defined as the third arc. In the projection of the second blade 372, the center line of the second blade located between the fifth circle D5 and the seventh circle D7 is defined as the fourth arc The center line of the second blade between the seventh circle D7 and the eighth circle D8 is defined as the fifth arc. The center line of the second blade located between the eighth circle D8 and the first circle D1 is defined as the sixth arc. In this embodiment, the arc length of the first arc of the first blade 371 is equal to the arc length of the fourth arc of the second blade, that is, The arc length and The arc lengths of the first blade and the fifth blade are equal, that is, The arc length and The arc lengths of the first blade and the sixth blade are equal, that is, The arc length and The arc lengths are equal.

[0062] See also Figure 8 , define the first arc The angle between the first arc and the fifth circumference D5 is the first angle β1. Here, the first angle β1 refers to the angle between the first arc and the fifth circumference D5. The first arc is defined at the intersection A1 with the fifth circle The tangent at the intersection A1 is defined as the first tangent, the tangent of the fifth circle D5 at the intersection A1 is defined as the second tangent, and the angle between the first tangent and the second tangent is defined as the first angle β1; define the first arc The angle between the first arc and the seventh circle D7 is the second angle β2. Here, the second angle β2 is the angle between the first arc and the seventh circle D7. The first arc is defined at the intersection A2 with the seventh circle D7 The tangent at the intersection A2 is defined as the third tangent, the tangent of the seventh circle D7 at the intersection A2 is defined as the fourth tangent, and the angle between the third tangent and the fourth tangent is defined as the second angle β2; the second arc is defined as The angle between the eighth circle D8 and the second arc is the third angle β3. Here, the third angle β3 refers to the angle between the second arc and the eighth circle D8. The second arc is defined at the intersection A3 with the eighth circle D8 The tangent at the intersection A3 is defined as the fifth tangent, and the tangent of the eighth circle D8 at the intersection A3 is defined as the sixth tangent. The angle between the fifth tangent and the sixth tangent is defined as the third angle β3. The angle between the third arc and the first circle D1 is defined as the fourth angle β4. Here, the fourth angle β4 refers to the angle between the third arc and the first circle D1. The third arc is defined at the intersection A4 with the first circle D1 The tangent at the intersection A1 is defined as the seventh tangent, the tangent of the first circle D1 at the intersection A4 is defined as the eighth tangent, and the angle between the seventh tangent and the eighth tangent is defined as the fourth angle β4. The first angle β1, the second angle β2, the third angle β3, and the fourth angle β4 satisfy the following relationship:

[0063] The first angle (β1) is less than the second angle (β2) and less than the third angle (β3) and less than the fourth angle (β4). Specifically, in this embodiment, the first angle (β1), the second angle (β2), the third angle (β3) and the fourth angle (β4) further satisfy the following relationship:

[0064] 15°≤first angle (β1)<second angle (β2)≤45°; 50°≤third angle (β3)≤64°; 70°≤fourth angle (β4)≤110°.

[0065] See also Figure 8 and Figure 9In this embodiment, a second blade 372 is provided between adjacent first blades 371. For better description, the two concepts of "first sub-blade and first sub-blade" are introduced here, and the adjacent first blades are defined as a first sub-blade 377 and a first sub-blade 378. The first sub-blade 377 and the first sub-blade 378 are substantially identical in structure. "Substantially identical" here means that machining errors may occur during machining of the first sub-blade and the first sub-blade. Ignoring the machining errors, the first sub-blade and the first sub-blade are substantially identical in structure. The second side surface 3712 of the first sub-blade 377 is provided between the first side surfaces 3711 of the two first blades. The impeller 32 is projected onto the first plane. On the first circumference D1, the arc between the second side surface 3712 of the first sub-blade 377 and the second side surface 3712 of the first sub-blade 378 is defined as a first arc. The arc length of the first arc is a first arc length L1. On the first circumference D1, the arc between the second side surface 3712 of the first sub-blade 377 and the fourth side surface 3722 of the second blade 378 is defined. The second arc has an arc length of the second arc L2, which is less than or equal to 0.5 times the first arc length L1. Specifically, in this embodiment, the second arc length L2 is 0.35 to 0.5 times the first arc length L1. When the electric pump is working, the first side surface 3711 is the pressure surface, and the second side surface 3712 is the back pressure surface. Usually, the working pressure of the pressure surface is greater than the working pressure of the back pressure surface. Since the second arc length L2 is less than or equal to 0.5 times the first arc length L1, compared with the tail of the first sub-blade 378, the second blade 372 The second blade 372 is arranged closer to the tail of the first sub-blade 377, that is, the second blade 372 is relatively closer to the back pressure surface of the first sub-blade 377. Since a turbulent zone may be formed at the tail of the second side 3712 when the electric pump is working, the second blade 372 is relatively closer to the back pressure surface of the first sub-blade 377. This is beneficial to reducing the tail turbulence near the second side 3712, thereby making the flow of the working medium near the second side 3712 smoother, which is beneficial to reducing the hydraulic loss of the pump and thus improving the hydraulic efficiency of the pump.

[0066] See also Figures 4 to 6, the support portion 36 includes an upper surface 361, and the first blade 371 and the second blade 372 are distributed in a circular array along the upper surface 361. Specifically, in this embodiment, the first blade 371 and the second blade 372 are integrally injection-molded with the upper surface 361; the upper surface 361 of the support portion 36 includes a flat portion 3611 and a curved portion 3612, and the first blade 371 includes a first section fixed to the flat portion 3611 and a second section fixed to the curved portion 3612; considering that the material of the injection-molded blade has a certain degree of brittleness, if it is too thin, the blade is likely to be damaged, broken or damaged, and if it is too thick, it will affect the hydraulic performance of the pump. Therefore, in this embodiment, the thickness ε1 of the first blade of the first section and the thickness ε2 of the second blade are in the range of 1 mm to 2 mm; specifically, combined with Figure 8 and Figure 9 In the first blade 371, the vertical distance between the first side surface 3711 located in the first section and the second side surface 3712 located in the second section is the thickness ε1 of the first blade 371 of the first section, and the thickness ε1 of the first blade 371 of the first section is greater than or equal to 1 mm and less than or equal to 2 mm. The second blade 372 is fixed to the planar portion 3611 of the upper surface 361. In the second blade 372, the vertical distance between the third side surface 3721 and the fourth side surface 3722 is the thickness ε2 of the second blade, and the thickness ε2 of the second blade is greater than or equal to 1 mm and less than or equal to 2 mm. Here, "the thickness ε2 of the second blade" refers to the thickness of the second blade without chamfering. In this embodiment, a chamfer is formed at the second head 376 of the second blade. Before the chamfer is formed, the thickness of the second blade at the second head is also greater than or equal to 1 mm and less than or equal to 2 mm. In this embodiment, to facilitate demolding, the first and second side surfaces of the first blade, and the third and fourth side surfaces of the second blade, have relatively small draft angles. Consequently, the draft angles are very small. Therefore, along the axial direction of the impeller, the difference in thickness ε1 of the first blade in the first section and the difference in thickness ε2 of the second blade due to the draft angles are negligible. In this embodiment, the upper surface of the support portion includes a planar portion and a curved portion. Of course, the upper surface of the support portion may also be entirely curved, and the first and second blades are secured to the curved upper surface.

[0067] See also Figure 10 , Figure 10 for Figure 1 A schematic structural diagram of a second embodiment of the middle rotor assembly, Figures 11 to 18 for Figure 10 The structure diagram of the impeller is shown in FIG. 2 , and the structure of the second embodiment of the rotor assembly is described below.

[0068] See also Figures 10 to 12The rotor assembly 3a includes an impeller 32a and a rotor 31a. The impeller 32a includes a cover plate 39a, a plurality of blades 37a and a support portion 36a. The plurality of blades 37a include a first blade 371a and a second blade 372a. The first blade 371a and the second blade 372a are arranged between the cover plate 39a and the support portion 36a. Specifically, in this embodiment, the blade 37a is integrally injection-molded with the cover plate 39a, and the blade integrally formed with the cover plate 39a is then fixedly connected to the support portion 36a. Of course, the blade 37a can also be integrally formed with the support portion 36a and then fixedly connected to the cover plate 39a. The impeller 32a also includes an impeller inlet 321a and an impeller outlet 322a. Specifically, the impeller inlet 321a is formed on the cover plate 39a, and multiple impeller outlets 322a are formed at the outer edge of the support portion 36a between adjacent blades. An impeller channel is formed between adjacent blades 37a and between the cover plate 36a and the support portion 39a. The impeller channel connects the impeller inlet 321a and the impeller outlet 322a. Compared with the first embodiment of the electric pump, the impeller of this embodiment includes a cover plate and a support portion, the blades are arranged between the cover plate 36a and the support portion 39a, and the impeller channel is formed between adjacent blades 37a and between the cover plate 36a and the support portion 39a. The specific structure of the impeller will be described below.

[0069] See also Figure 13 Impeller 32a comprises two parts: a first part 41a and a second part 42a. First part 41a and second part 42a are fixedly connected. Specifically, first part 41a includes a support portion 36a and a boss portion 38a, which are integrally formed. Second part 42a includes a cover plate 39a and blades 37a, which are integrally injection molded. In this embodiment, first part 41a and second part 42a are fixedly connected by welding. Of course, first part 41a and second part 42a can also be fixed by other means, such as an interference fit connection or a fixed connection via a connecting device.

[0070] See also Figure 14 and Figure 15, the first part 41a includes a first mounting groove 411a and a second mounting groove 412a. Specifically, the first mounting groove 411a and the second mounting groove 412a are formed on the upper surface 361a of the support portion 36a. The length of the first mounting groove 411a is greater than the length of the second mounting groove 412a. Here, "the length of the first mounting groove 411a and the length of the second mounting groove 412a" refers to the length of the trajectory measured along the shape trajectory of the projection of the first part 41a on the first plane. In this embodiment, the number of the first mounting grooves 411a is the same as the number of the first blades, and the number of the second mounting grooves 412a is the same as the number of the second blades; a plurality of first protrusions 413a are provided in the first mounting groove 411a and the second mounting groove 412a, and the first protrusion 413a extends from the bottom of the first mounting groove 411a to the first mounting groove The mounting groove 411a is raised, and the first protrusion 413a in the first mounting groove 411a is connected to the side wall of the first mounting groove 411a, and the first protrusion 413a in the second mounting groove 412a is connected to the side wall of the second mounting groove 412a. The first protrusion 413a includes a first tip 4131a formed by two inclined surfaces, and the height of the first tip 4131a is lower than the groove depth of the first mounting groove 411a and the second mounting groove 412a; at least one first mounting groove 411a is provided with a mounting hole 414a that passes through the upper and lower surfaces of the support portion 36a. In this embodiment, each first mounting groove 411a is provided with a mounting hole 414a that passes through the upper and lower surfaces of the support portion 36a. Specifically, each first mounting groove 411a is provided with a mounting hole 414a that passes through the upper and lower surfaces of the support portion. Of course, two or more mounting holes 414a can also be provided in each first mounting groove 411a.

[0071] See also Figures 16 to 18 The second portion 42a includes a cover plate 39a and a plurality of blades 37a. The cover plate 39a and the blades 37a are integrally formed by injection molding. The blades 37a include a first blade 371a and a second blade 372a. The first blade 371a and the second blade 372a are distributed in a circular array along the cover plate 39a. A second blade 372a is provided between adjacent first blades 371a. In this embodiment, the second portion 42a further includes at least one positioning post 421a. The positioning post 421a protrudes in a direction away from the cover plate 39a. The positioning post 421a is formed on the first blade 371a. The first blade 371a includes a bottom 3717a. The positioning post 421a protrudes from the bottom 3717a of the first blade. Specifically, each first blade 371a is formed with a positioning post 421a. Of course, each first blade 371a may also be formed with two or more positioning posts 421a. Figure 18The second portion 42a further includes a second protrusion 423a and a third protrusion 424a. The second protrusion 423a is integrally formed with the first blade 371a, and the third protrusion 424a is integrally formed with the second blade 372a. The second protrusion 423a and the third protrusion 424a are protruded in a direction away from the cover plate 39a. Specifically, the second protrusion 423a protrudes from the bottom 3717a of the first blade 371a, and the third protrusion protrudes from the bottom 3727a of the second blade 372a. The length of the second protrusion 423a is greater than the length of the third protrusion 424a. Here, the "second protrusion 423a" is The length of a and the length of the third protrusion 424a refer to the length of the trajectory measured by projecting the second portion 42a onto the horizontal plane along the shape trajectory of the projection of the second protrusion 423a and the third protrusion 424a. The protrusion heights of the second protrusion 423a and the third protrusion 424a are less than the axial height of the positioning column 421a. This can avoid the second protrusion 423a and the third protrusion 424a from interfering with the assembly of the second portion 42a. The second protrusion 423a includes a second tip 4231a formed by two inclined surfaces, and the third protrusion 424a includes a third tip 4241a formed by two inclined surfaces. Figure 14 When assembling the impeller, the positioning column 421a is inserted into Figure 15 The mounting hole 414a in the Figure 14 The mounting holes 414a in the first and second parts are arranged in a coordinated manner, which is beneficial for positioning the first and second parts 41a and 42a during installation, thereby facilitating assembly of the first and second parts; Figure 15 When the impeller is assembled, a portion of the first blade 371a is located in the first mounting groove 411a, a portion of the second blade 372a is located in the second mounting groove 412a, the first protrusion 413a in the first mounting groove 411a is in contact with the second protrusion 423a of the second portion 42a, and the first protrusion 413a in the second mounting groove 412a is in contact with the third protrusion 424a of the second portion 42a. Specifically, the first tip 4131a of the first protrusion 413a in the first mounting groove 411a is The second tip 4231a of the second protrusion 423a, the first tip 4131a of the first protrusion 413a in the second mounting groove 412a are in contact with the third tip 4241a of the third protrusion 424a, so that the first protrusion 413a is in line or surface contact with the second protrusion 423a and the third protrusion 424a, which is beneficial to the welding of the first part 41a and the second part 42a. Specifically, in this embodiment, the first part 41a and the second part 42a are fixed into one by ultrasonic welding.

[0072] Compared with the first embodiment of the rotor assembly, in this embodiment, the impeller 32a also includes a cover plate 39a, and the blades 37a are integrally formed with the cover plate 39a. The blades integrally formed with the cover plate 39a are then fixedly connected to the support portion 36a. Of course, the blades 37a can also be integrally formed with the support portion 36a and then fixedly connected to the cover plate 39a. Other features in this embodiment can be referred to the first embodiment of the rotor assembly and will not be described in detail here.

[0073] See also Figure 19 , Figure 19 for Figure 1 A schematic structural diagram of a third embodiment of a rotor assembly, Figures 20 to 22 for Figure 19 A structural schematic diagram of the middle impeller, the structure of the third embodiment of the rotor assembly will be described below.

[0074] See also Figures 19 to 22 , the rotor assembly 3b includes an impeller 32b and a rotor 31b, the impeller 32b includes a first blade 371b, a second blade 372b and a third blade 379b, the third blade 379b is distributed in a circumferential array along the impeller 32b, specifically, the third blade 372b is distributed in a circumferential array along the support portion 36b, the length of the second blade 372b is smaller than the length of the first blade 371b, and the length of the third blade 379b is smaller than the length of the second blade 372b, where "the length of the first blade 371b, the length of the second blade 372b and the length of the third blade 379b" refers to the length of the trajectory measured along the shape trajectory of the projection of the first blade 317b, the second blade 372b and the third blade 379b when the impeller 32b is projected onto the first plane; the third blade 379b is arranged between adjacent first blades 371b and second blades 372b, that is, one second blade and one third blade are arranged between adjacent first blades, and three blades form a group; see Figure 22 For two adjacent first blades, the two first blades are defined as the first sub-blade 377b and the first sub-blade 378b respectively. The second side surface 3712b of the first sub-blade 377b is arranged between the first side surfaces 3711b of the two first blades. Compared with the first sub-blade 377b, the third blade 379b is closer to the first sub-blade 378b than the second blade 372b.

[0075] See also Figure 20 and Figure 21The third blade 379b includes a third head portion 3791b and a third tail portion 3792b. The third tail portion 3792b is closer to the outer edge of the impeller 32b than the third head portion 3791b. The third tail portion 3792b is flush with a portion of the outer edge of the impeller 32b. Here, "flush" means that when the impeller is projected onto the first plane, the distance between the projection of the third tail portion 3792b and the projection of the outer edge of the impeller 32b is within 2 mm; see Figure 21 , project the impeller 32b onto the first plane, define the circumference where the projection of the outer edge of the impeller 32b is located as the first circumference D1, the diameter of the first circumference D1 is the first diameter (Φ1), define the circumference where the projection of the third head 3791c is located as the tenth circumference D10, the diameter of the tenth circumference D10 is the third diameter Φ3, and the third diameter Φ3 is 0.7 to 0.8 times the first diameter Φ1.

[0076] Compared with the first embodiment of the rotor assembly, the impeller 32b in this embodiment also includes a third blade 379b. The length of the third blade 379b is smaller than the length of the first blade 371b and the second blade 372b. The setting of the third blade in this embodiment is beneficial to rectifying the fluid in the impeller, thereby reducing the hydraulic loss of the pump, thereby improving the hydraulic efficiency of the pump. Other features of the rotor assembly in this embodiment can be referred to the first embodiment, and will not be elaborated here.

[0077] See also Figures 23 to 26 , Figure 23 for Figure 1 A schematic structural diagram of a fourth embodiment of the middle rotor assembly, Figures 24 to 26 for Figure 23 The structure diagram of the impeller is shown in FIG. The structure of the fourth embodiment of the rotor assembly will be described below.

[0078] See also Figures 23 to 25 The rotor assembly 3c includes an impeller 32c and a rotor 31c. The impeller 32c includes a first part 41c and a second part 42c. The first part 41c is fixedly connected to the second part 42c. The first part 41c includes a support portion 36c. The first part 41c also includes a first mounting groove 411c and a second mounting groove 413c. The first mounting groove 411c and the second mounting groove 412c are formed on the upper surface 361c of the support portion 36c. The length of the first mounting groove 411a is greater than the length of the second mounting groove 412a. The first part in this embodiment has the same structure as the first part in the second embodiment of the rotor assembly, and will not be elaborated here. Of course, in this embodiment, a mounting groove corresponding to the third blade can also be formed on the upper surface of the support portion.

[0079] See also Figure 26The second portion 42c includes a cover plate 39c and a plurality of blades 37c. The cover plate 39c and the blades 37c are integrally formed by injection molding. The blades 37c include a first blade 371c, a second blade 372c, and a third blade 379c. Aside from the third blade 379c, the other structures of the second portion in this embodiment are identical to those of the second portion in the second embodiment of the rotor assembly, and will not be described in detail here. Of course, in this embodiment, a second or third protrusion similar to that in the second embodiment may also be formed on the upper surface of the third blade. In this embodiment, the first portion 41c and the second portion 42c are fixed together by welding. Of course, the first portion 41c and the second portion 42c may also be fixed by other means, such as an interference fit connection or a fixed connection via a connecting device.

[0080] Compared with the first embodiment of the rotor assembly, the impeller 32c also includes a cover plate 39c and a third blade 379c. The blade 37c is integrally formed with the cover plate 39c, and the blade integrally formed with the cover plate 39c is then fixedly connected to the support portion 36c. Of course, the blade 37c can also be integrally formed with the support portion 36c and then fixedly connected to the cover plate 39c. The impeller assembly features in this embodiment can refer to the second embodiment, the other features of the third blade of the impeller can refer to the fourth embodiment, and the other features of the impeller can refer to the first embodiment, which will not be described in detail here.

[0081] It should be noted that the above embodiments are only used to illustrate the present invention and are not intended to limit the technical solutions described in the present invention. Although this specification has described the present invention in detail with reference to the above embodiments, it should be understood by those skilled in the art that the present invention can still be modified or replaced by equivalents, and all technical solutions and improvements thereof that do not depart from the spirit and scope of the present invention should be included in the scope of the claims of the present invention.

Claims

1. An electric pump, characterized in that: The electric pump includes a rotor assembly and a stator assembly, the rotor assembly includes an impeller and a rotor, the impeller is fixedly connected to the rotor, the impeller includes a support portion and a plurality of blades, the plurality of blades include a first blade and a second blade, the length of the first blade is greater than the length of the second blade, the first blade and the second blade are distributed in a circumferential array along the support portion, and the second blade is arranged between adjacent first blades; the first blade includes a first side surface and a second side surface, the first side surface is a pressure surface, and the second side surface is a back pressure surface; The first side surface includes at least a first curved surface and a second curved surface, the first curved surface and the second curved surface are smoothly connected, the first curved surface is convex, the second curved surface is concave, and the first curved surface is closer to the center of the impeller than the second curved surface; a first plane is defined, the first plane is perpendicular to the central axis of the impeller, and the impeller is projected onto the first plane. The center of the projection of the first curved surface is located on one side of the projection of the first blade, and the center of the projection of the second curved surface is located on the other side of the projection of the first blade; The second side surface includes at least a third curved surface and a fourth curved surface, the third curved surface is smoothly connected to the fourth curved surface, the third curved surface is concave, and the fourth curved surface is convex. The third curved surface is closer to the center of the impeller than the fourth curved surface. When the impeller is projected onto the first plane, the center of the projection of the third curved surface is located on one side of the projection of the first blade, and the center of the projection of the fourth curved surface is located on the other side of the projection of the first blade. The impeller is projected onto the first plane, and the center of the first arc surface projection of the first side surface and the center of the third arc surface projection of the second side surface are located on one side of the first blade projection, and the center of the second arc surface projection of the first side surface and the center of the fourth arc surface projection of the second side surface are located on the other side of the first blade projection; The second blade includes a third side surface and a fourth side surface, the third side surface is a pressure surface, the fourth side surface is a back pressure surface, and the third side surface is arranged between the second side surface of the first blade and the fourth side surface of the second blade; The third side surface includes at least a fifth arc surface and a sixth arc surface, the fifth arc surface is smoothly connected to the sixth arc surface, the fifth arc surface is closer to the center of the impeller than the sixth arc surface, and the center of the projection of the impeller onto the first plane is located on one side of the projection of the second blade, and the center of the projection of the sixth arc surface is located on the other side of the projection of the second blade; The fourth side surface includes at least a seventh arc surface and an eighth arc surface, the seventh arc surface is smoothly connected to the eighth arc surface, the seventh arc surface is closer to the center of the impeller than the eighth arc surface, and the center of the projection of the impeller onto the first plane is located on one side of the projection of the second blade, and the center of the projection of the eighth arc surface is located on the other side of the projection of the second blade; The impeller is projected onto the first plane, and the center of the fifth arc surface projection of the third side surface and the center of the seventh arc surface projection of the fourth side surface are located on one side of the second blade projection, and the center of the sixth arc surface projection of the third side surface and the center of the eighth arc surface projection of the fourth side surface are located on the other side of the second blade projection; For the second blade, the center of the fifth arc surface projection of the third side surface and the center of the seventh arc surface projection of the fourth side surface are arranged closer to the fourth side surface than the third side surface, and the center of the sixth arc surface projection of the third side surface and the center of the eighth arc surface projection of the fourth side surface are arranged closer to the third side surface than the fourth side surface.

2. The electric pump according to claim 1, characterized in that: The first blade includes a first tail portion and a first head portion, the first tail portion is closer to the outer circumference of the impeller than the first head portion, and the second blade includes a second tail portion and a second head portion, the second tail portion is closer to the outer circumference of the impeller than the second head portion; the impeller is projected onto the first plane, and the circumference where the projection of the first head portion of the first blade is located is defined as the base circumference (DO), the circumference where the projection of the outer edge of the impeller is located is defined as the first circumference (D1), the distance between the first circumference (D1) and the base circumference (D0) is defined as the first distance, and the first distance is divided into eight equal parts to obtain the second circumference (D2), the third circumference (D3), the fourth circumference (D4), the fifth circumference (D5), the sixth circumference (D6), the seventh circumference (D7), and the eighth circumference (D8); in the projection of the first blade, the area between the fifth circumference (D5) and the base circumference (D0) is defined as the first distance. The center line of the first blade between the seventh circle (D7) is defined as a first arc (A1⌒A2), the center line of the first blade between the seventh circle and the eighth circle (D8) (D7) is defined as a second arc (A2⌒A3), and the center line of the first blade between the eighth circle (D8) and the first circle (D1) is defined as a third arc (A3⌒A4); in the projection of the second blade, the center line of the second blade between the fifth circle (D5) and the seventh circle (D7) is defined as a fourth arc (B1⌒B2), the center line of the second blade between the seventh circle (D7) and the eighth circle (D8) is defined as a fifth arc (B2⌒B3), and the center line of the second blade between the eighth circle (D8) and the first circle (D1) is defined as a sixth arc (B3⌒B4); The arc length of the first arc (A1⌒A2) of the first blade is equal to the arc length of the fourth arc (B1⌒B2) of the second blade, the arc length of the second arc (A2⌒A3) of the first blade is equal to the arc length of the fifth arc (B2⌒B3) of the second blade, and the arc length of the third arc (A3⌒A4) of the first blade is equal to the arc length of the sixth arc (B3⌒B4) of the second blade.

3. The electric pump according to claim 2, characterized in that: The angle between the first arc (A1⌒A2) and the fifth circle (D5) is defined as a first angle (β1), the angle between the first arc (A1⌒A2) and the seventh circle (D7) is defined as a second angle (β2), the angle between the second arc (A2⌒A3) and the eighth circle (D8) is defined as a third angle (β3), and the angle between the third arc (A3⌒A4) and the first circle (D1) is defined as a fourth angle (β4). The first angle (β1), the second angle (β2), the third angle (β3), and the fourth angle (β4) satisfy the following relationship: The first angle (β1) is less than the second angle (β2) and the third angle (β3) is less than the fourth angle (β4).

4. The electric pump according to claim 3, characterized in that: The first angle (β1), the second angle (β2), the third angle (β3), and the fourth angle (β4) satisfy the following relationship: 15°≤first angle (β1)<second angle (β2)≤45°; 50°≤third angle (β3)≤64°; 70°≤fourth angle (β4)≤110°.

5. The electric pump according to any one of claims 1 to 4, characterized in that: The first blade includes a first tail portion and a first head portion, the first tail portion is closer to the outer circumference of the impeller than the first head portion, the second blade includes a second tail portion and a second head portion, the second tail portion is closer to the outer circumference of the impeller than the second head portion, the impeller is projected onto the first plane, and the circumference on which the projection of the outer edge of the impeller lies is defined as a first circumference (D1), the projection of the first tail portion coincides with a portion of the first circumference (D1), and the projection of the second tail portion coincides with a portion of the first circumference (D1).

6. The electric pump according to claim 5, characterized in that: The impeller is projected onto the first plane, the diameter of the first circumference (D1) is the first diameter (Φ1), the circumference on which the projection of the second head of the second blade is located is the ninth circumference (D9), the diameter of the ninth circumference (D9) is the second diameter (Φ2), and the second diameter (Φ2) is 0.6 to 0.7 times the first diameter (Φ1).

7. The electric pump according to any one of claims 2 to 4 and 6, characterized in that: A second blade is arranged between adjacent first blades. For one of the second blades and two first blades adjacent to the second blade, the two first blades are defined as a first sub-blade and a first sub-blade, respectively. The second side surface of the first sub-blade is arranged between the two first side surfaces. The impeller is projected onto the first plane. On the first circumference, the arc between the second side surface of the first sub-blade and the second side surface of the first sub-blade is defined as a first arc, and the arc length of the first arc is a first arc length (L1). On the first circumference, the arc between the second side surface of the first sub-blade and the fourth side surface of the second blade is a second arc, and the arc length of the second arc is a second arc length (L2). The second arc length (L2) is less than or equal to 0.5 times the first arc length (L1).

8. The electric pump according to claim 5, characterized in that: A second blade is arranged between adjacent first blades. For one of the second blades and two first blades adjacent to the second blade, the two first blades are defined as a first sub-blade and a first sub-blade, respectively. The second side surface of the first sub-blade is arranged between the two first side surfaces. The impeller is projected onto the first plane. On the first circumference, the arc between the second side surface of the first sub-blade and the second side surface of the first sub-blade is defined as a first arc, and the arc length of the first arc is a first arc length (L1). On the first circumference, the arc between the second side surface of the first sub-blade and the fourth side surface of the second blade is a second arc, and the arc length of the second arc is a second arc length (L2). The second arc length (L2) is less than or equal to 0.5 times the first arc length (L1).

9. The electric pump according to any one of claims 2 to 4 and 6, characterized in that: A second blade is arranged between adjacent first blades. For one of the second blades and two first blades adjacent to the second blade, the two first blades are defined as a first sub-blade and a first sub-blade, respectively. The second side surface of the first sub-blade is arranged between the first side surfaces of the two first blades. The impeller is projected onto the first plane. On the first circumference, the arc between the second side surface of the first sub-blade and the second side surface of the first sub-blade is defined as a first arc, and the arc length of the first arc is the first arc length (L1). On the first circumference, the arc between the second side surface of the first sub-blade and the fourth side surface of the second blade is a second arc, and the arc length of the second arc is the second arc length (L2). The arc length of the second arc is the second arc length (L2), and the second arc length (L2) is 0.35 to 0.5 times the first arc length (L1).

10. The electric pump according to claim 5, characterized in that: A second blade is arranged between adjacent first blades. For one of the second blades and two first blades adjacent to the second blade, the two first blades are defined as a first sub-blade and a first sub-blade, respectively. The second side surface of the first sub-blade is arranged between the first side surfaces of the two first blades. The impeller is projected onto the first plane. On the first circumference, the arc between the second side surface of the first sub-blade and the second side surface of the first sub-blade is defined as a first arc, and the arc length of the first arc is the first arc length (L1). On the first circumference, the arc between the second side surface of the first sub-blade and the fourth side surface of the second blade is a second arc, and the arc length of the second arc is the second arc length (L2). The arc length of the second arc is the second arc length (L2), and the second arc length (L2) is 0.35 to 0.5 times the first arc length (L1).

11. The electric pump according to any one of claims 1 to 4, 6, 8, and 10, characterized in that: Orthogonally project the impeller onto the first plane. For the first blade, the center of the projection of the first curved surface of the first side surface coincides with the center of the projection of the third curved surface of the second side surface, and the center of the projection of the second curved surface of the first side surface coincides with the center of the projection of the fourth curved surface of the second side surface. Orthogonally project the impeller onto the first plane. For the second blade, the center of the projection of the fifth curved surface of the third side surface coincides with the center of the projection of the seventh curved surface of the fourth side surface, and the center of the projection of the sixth curved surface of the third side surface coincides with the center of the projection of the eighth curved surface of the fourth side surface.

12. The electric pump according to claim 5, characterized in that: Orthogonally project the impeller onto the first plane. For the first blade, the center of the projection of the first curved surface of the first side surface coincides with the center of the projection of the third curved surface of the second side surface, and the center of the projection of the second curved surface of the first side surface coincides with the center of the projection of the fourth curved surface of the second side surface. Orthogonally project the impeller onto the first plane. For the second blade, the center of the projection of the fifth curved surface of the third side surface coincides with the center of the projection of the seventh curved surface of the fourth side surface, and the center of the projection of the sixth curved surface of the third side surface coincides with the center of the projection of the eighth curved surface of the fourth side surface.

13. The electric pump according to claim 7, characterized in that: Orthogonally project the impeller onto the first plane. For the first blade, the center of the projection of the first curved surface of the first side surface coincides with the center of the projection of the third curved surface of the second side surface, and the center of the projection of the second curved surface of the first side surface coincides with the center of the projection of the fourth curved surface of the second side surface. Orthogonally project the impeller onto the first plane. For the second blade, the center of the projection of the fifth curved surface of the third side surface coincides with the center of the projection of the seventh curved surface of the fourth side surface, and the center of the projection of the sixth curved surface of the third side surface coincides with the center of the projection of the eighth curved surface of the fourth side surface.

14. The electric pump according to claim 9, characterized in that: Orthogonally project the impeller onto the first plane. For the first blade, the center of the projection of the first curved surface of the first side surface coincides with the center of the projection of the third curved surface of the second side surface, and the center of the projection of the second curved surface of the first side surface coincides with the center of the projection of the fourth curved surface of the second side surface. Orthogonally project the impeller onto the first plane. For the second blade, the center of the projection of the fifth curved surface of the third side surface coincides with the center of the projection of the seventh curved surface of the fourth side surface, and the center of the projection of the sixth curved surface of the third side surface coincides with the center of the projection of the eighth curved surface of the fourth side surface.

15. The electric pump according to any one of claims 1 to 4, 6, 8, 10, 12 to 14, characterized in that: The support portion includes an upper surface, the first blades and the second blades are distributed in a circumferential array along the upper surface, the upper surface of the support portion is a curved surface, and the first blades and the second blades are fixed to the upper surface.

16. The electric pump according to claim 5, characterized in that: The support portion includes an upper surface, the first blades and the second blades are distributed in a circumferential array along the upper surface, the upper surface of the support portion is a curved surface, and the first blades and the second blades are fixed to the upper surface.

17. The electric pump according to claim 7, characterized in that: The support portion includes an upper surface, the first blades and the second blades are distributed in a circumferential array along the upper surface, the upper surface of the support portion is a curved surface, and the first blades and the second blades are fixed to the upper surface.

18. The electric pump according to claim 9, characterized in that: The support portion includes an upper surface, the first blades and the second blades are distributed in a circumferential array along the upper surface, the upper surface of the support portion is a curved surface, and the first blades and the second blades are fixed to the upper surface.

19. The electric pump according to claim 11, characterized in that: The support portion includes an upper surface, the first blades and the second blades are distributed in a circumferential array along the upper surface, the upper surface of the support portion is a curved surface, and the first blades and the second blades are fixed to the upper surface.

20. The electric pump according to any one of claims 1 to 4, 6, 8, 10, 12 to 14, characterized in that: The support portion includes an upper surface, and the first blades are distributed in a circular array along the upper surface. The upper surface of the support portion includes a planar portion and a curved portion. The first blade includes a first section fixed to the planar portion and a second section fixed to the curved portion. In the first blade, the vertical distance between the first side surface located in the first section and the second side surface located in the second section is the thickness ε1 of the first blade of the first section. The thickness ε1 of the first blade of the first section is greater than or equal to 1 mm and less than or equal to 2 mm.

21. The electric pump according to claim 5, characterized in that: The support portion includes an upper surface, and the first blades are distributed in a circular array along the upper surface. The upper surface of the support portion includes a planar portion and a curved portion. The first blade includes a first section fixed to the planar portion and a second section fixed to the curved portion. In the first blade, the vertical distance between the first side surface located in the first section and the second side surface located in the second section is the thickness ε1 of the first blade of the first section. The thickness ε1 of the first blade of the first section is greater than or equal to 1 mm and less than or equal to 2 mm.

22. The electric pump according to claim 7, characterized in that: The support portion includes an upper surface, and the first blades are distributed in a circular array along the upper surface. The upper surface of the support portion includes a planar portion and a curved portion. The first blade includes a first section fixed to the planar portion and a second section fixed to the curved portion. In the first blade, the vertical distance between the first side surface located in the first section and the second side surface located in the second section is the thickness ε1 of the first blade of the first section. The thickness ε1 of the first blade of the first section is greater than or equal to 1 mm and less than or equal to 2 mm.

23. The electric pump according to claim 9, characterized in that: The support portion includes an upper surface, and the first blades are distributed in a circular array along the upper surface. The upper surface of the support portion includes a planar portion and a curved portion. The first blade includes a first section fixed to the planar portion and a second section fixed to the curved portion. In the first blade, the vertical distance between the first side surface located in the first section and the second side surface located in the second section is the thickness ε1 of the first blade of the first section. The thickness ε1 of the first blade of the first section is greater than or equal to 1 mm and less than or equal to 2 mm.

24. The electric pump according to claim 11, characterized in that: The support portion includes an upper surface, and the first blades are distributed in a circular array along the upper surface. The upper surface of the support portion includes a planar portion and a curved portion. The first blade includes a first section fixed to the planar portion and a second section fixed to the curved portion. In the first blade, the vertical distance between the first side surface located in the first section and the second side surface located in the second section is the thickness ε1 of the first blade of the first section. The thickness ε1 of the first blade of the first section is greater than or equal to 1 mm and less than or equal to 2 mm.

25. The electric pump according to any one of claims 21 to 24, characterized in that: The second blades are distributed in a circular array along the upper surface, and the second blades are fixed to the planar portion of the upper surface. In the second blade, the vertical distance between the third side surface and the fourth side surface is the thickness ε2 of the second blade, and the thickness of the second blade is greater than or equal to 1 mm and less than or equal to 2 mm.

26. The electric pump according to claim 20, characterized in that: The second blades are distributed in a circular array along the upper surface, and the second blades are fixed to the planar portion of the upper surface. In the second blade, the vertical distance between the third side surface and the fourth side surface is the thickness ε2 of the second blade, and the thickness of the second blade is greater than or equal to 1 mm and less than or equal to 2 mm.

27. The electric pump according to any one of claims 1 to 4, characterized in that: The impeller also includes a third blade, the length of the third blade is smaller than the length of the second blade, the third blades are distributed in a circular array along the impeller, and the third blade is arranged between adjacent first blades and second blades; for two adjacent first blades, the two first blades are defined as a first sub-blade and a first sub-blade, respectively, the second side surface of the first sub-blade is arranged between the first side surfaces of the two first blades, and the third blade is closer to the first sub-blade than the second blade.

28. The electric pump according to claim 27, characterized in that: The third blade includes a third head and a third tail, the third tail is closer to the outer circumference of the impeller than the third head, and the third tail is flush with part of the outer edge of the impeller; the impeller is projected onto the first plane, and the circumference where the projection of the outer edge of the impeller is located is defined as the first circumference (D1), the diameter of the first circumference (D1) is defined as the first diameter (Φ1), the circumference where the projection of the third head is located is defined as the tenth circumference (D10), the diameter of the tenth circumference (D10) is defined as the third diameter (Φ3), and the third diameter is 0.7 to 0.8 times the first diameter.

29. The electric pump according to any one of claims 1 to 4, characterized in that: The impeller further includes a cover plate, the blades are arranged between the cover plate and the support portion, and the blades and the cover plate are fixedly arranged relative to each other or are integrally injection-molded.

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