Impeller, electronic water pump and vehicle

Abstract

The application discloses a kind of impeller, electronic water pump and vehicle, impeller includes base body and blade component, blade is arranged at base body Circumferential spacing, the tail end surface of adjacent blade, first cover and second cover define fluid outlet, any two adjacent fluid outlet has different outlet area;Multiple blades are arranged at base body Circumferential spacing, the mass distribution of impeller is more balanced, can promote the dynamic balance performance of impeller, so that impeller can rotate smoothly, reduce the operating noise of water pump;In addition, any two adjacent fluid outlet is set to have different outlet area, the flow rate of fluid flowing at adjacent fluid outlet is different, fluid with different flow rate will flow to different positions of baffle, make the action point of blade to baffle to separate fluid, scatter fluid energy, avoid that fluid energy concentrates in baffle, to reduce the pressure pulsation and order noise of impeller.

Description

Technical Field

[0001] This invention relates to the field of fluid machinery technology, and more particularly to an impeller, an electric water pump, and a vehicle. Background Technology

[0002] Traditional impellers typically consist of multiple blades evenly distributed. When the impeller rotates, each blade periodically passes through the tongue of the volute, generating periodic fluid pressure pulsations, resulting in high first-order noise. In related technologies, a non-uniform blade arrangement is used to stagger the interaction points between the blades and the volute tongue to reduce first-order noise. However, the non-uniform blade arrangement leads to poor dynamic balance of the impeller as a whole and generates first-order noise. Therefore, the overall noise optimization of the impeller is not ideal and cannot improve the NVH performance of the impeller. Summary of the Invention

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, the present invention proposes an impeller that can reduce pressure pulsation and order noise of the impeller, while improving the dynamic balance performance of the impeller.

[0004] The present invention also proposes an electronic water pump having the above-described impeller.

[0005] The present invention also proposes a vehicle having the above-mentioned electronic water pump.

[0006] According to a first aspect of the present invention, an impeller includes a base and a blade assembly. The base includes a first cover plate and a second cover plate spaced apart along an axial direction. The blade assembly is disposed between the first cover plate and the second cover plate. The blade assembly includes a plurality of blades. The blades are respectively connected to the first cover plate and the second cover plate on opposite sides along the axial direction. The blades are arranged at equal intervals around the circumference of the base. One end of each blade extending to the periphery of the base has a tail end face. The tail end faces of adjacent blades, the first cover plate, and the second cover plate define a fluid outlet. Any two adjacent fluid outlets have different outlet areas.

[0007] The impeller according to embodiments of the present invention has at least the following beneficial effects:

[0008] In embodiments of the present invention, multiple blades are arranged at equal intervals around the circumference of the base, resulting in a more balanced mass distribution of the impeller. This improves the dynamic balance performance of the impeller, enabling it to rotate smoothly and reducing the operating noise of the water pump. Furthermore, by setting any two adjacent fluid outlets to have different outlet areas, the fluid flowing out of adjacent outlets will have different flow velocities. Fluids with different velocities will flow to different positions on the tongue, causing the blades to separate the points of action of the fluids against the tongue, thus dispersing the fluid energy and preventing it from concentrating on the tongue, thereby reducing pressure pulsation and order noise in the impeller.

[0009] According to some embodiments of the present invention, the blade assembly includes x blades, and n adjacent blades form a mixing unit, the blade assembly includes at least two mixing units, and 3 ≤ n ≤ x / 2; wherein,

[0010] Within each of the mixing units, any two fluid outlets have different outlet areas;

[0011] And / or, belonging to adjacent mixing units, and having different outlet areas for two fluid outlets that are circumferentially adjacent along the matrix.

[0012] According to some embodiments of the present invention, any two fluid outlets have different outlet areas.

[0013] According to some embodiments of the present invention, the blade has a working surface and a back surface, the working surface and the back surface being disposed on opposite sides of the tail end face along the circumferential direction of the substrate; the blade with the tail end face being an arc surface is defined as a first blade; the blade with the tail end face inclined towards the center of the substrate along the direction of the second cover plate toward the first cover plate is a second blade; the blade with the working surface gradually approaching the back surface along the direction toward the tail end face is a third blade.

[0014] The blade assembly includes at least one of the first blade, the second blade, and the third blade.

[0015] According to some embodiments of the present invention, the mixing unit includes at least one of the first blade, the second blade, and the third blade;

[0016] Alternatively, the mixing unit may include the first blade, the second blade, and the third blade, where n=3.

[0017] According to some embodiments of the present invention, two blades belonging to adjacent mixing units and circumferentially adjacent to the substrate are respectively configured as two of the first blade, the second blade, and the third blade.

[0018] According to some embodiments of the present invention, the lengths of adjacent blades are different.

[0019] According to some embodiments of the present invention, the blade assembly includes x blades, wherein x / 2 of the blades are long blades and x / 2 of the blades are short blades, the length of the long blades is greater than the length of the short blades, and the long blades and the short blades are arranged alternately along the circumference of the substrate.

[0020] An electronic water pump according to a second aspect embodiment of the present invention comprises:

[0021] In the first aspect embodiment, the impeller includes x blades in the blade assembly;

[0022] An electric motor is connected to the impeller and is used to drive the impeller to rotate. The number of pole pairs of the motor is y, the number of slots of the motor is z, x / 2 and y are relatively prime numbers, and x / 2 and z / 3 are relatively prime numbers.

[0023] A vehicle according to a second aspect embodiment of the present invention includes an electronic water pump according to the second aspect embodiment.

[0024] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0026] Figure 1 This is a perspective view of one embodiment of the impeller in the present invention;

[0027] Figure 2 This is a cross-sectional view of one embodiment of the impeller in this invention;

[0028] Figure 3 A schematic diagram of one embodiment of the blade assembly;

[0029] Figure 4 The diagram shows the structure of the first blade, the second blade, and the third blade, as well as the distribution of the hybrid unit.

[0030] Figure 5 This is a schematic diagram showing the locations of the monitoring points on the volute.

[0031] Figure 6 The pressure pulsation spectrum of the blade assembly after simulation based on the first embodiment;

[0032] Figure 7 The pressure pulsation spectrum of the blade assembly after simulation based on the second embodiment;

[0033] Figure 8 The pressure pulsation spectrum of the blade assembly after simulation based on the third embodiment;

[0034] Figure 9 A schematic diagram of one embodiment of an electronic water pump;

[0035] Figure 10 The pressure pulsation spectrum is a simulation of a 9-bladed impeller.

[0036] Figure label:

[0037] Impeller 10, base 100, first cover plate 110, second cover plate 120; blade assembly 200, blade 210, tail end face 211, working surface 212, back side 213, first blade 214, second blade 215, third blade 216; fluid outlet 300; motor 20. Detailed Implementation

[0038] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0039] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0040] In the description of this invention, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0041] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0042] In the description of this invention, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0043] In response to the current situation where impellers cannot simultaneously improve dynamic balance performance and reduce first-order noise, referring to Figure 1 and Figure 2The present invention provides an impeller 10, which includes a base 100 and a blade assembly 200. The impeller 10 has an axial direction parallel to its own axis. The base 100 includes a first cover plate 110 and a second cover plate 120 spaced apart along the axial direction. The blade assembly 200 is disposed between the first cover plate 110 and the second cover plate 120. The blade assembly 200 includes a plurality of blades 210. The two opposite sides of the blades 210 along the axial direction are respectively connected to the first cover plate 110 and the second cover plate 120. The blade assembly 200 and the base 100 can rotate synchronously. When the blade assembly 200 rotates, it agitates the fluid to realize the delivery of the fluid.

[0044] like Figure 3 As shown, the impeller 10 is usually located inside the volute of the pump body. The blades 210 tend to extend from the center of the base 100 to the periphery of the base 100. The end of the blades 210 extending to the periphery of the base 100 has a tail end face 211. The tail end faces 211 of adjacent blades 210, the first cover plate 110 and the second cover plate 120 define the fluid outlet 300. The fluid flows axially into the volute. The fluid first contacts the end of the blades 210 facing the center of the base 100. When the blade assembly 200 rotates, it drives the fluid to flow. The fluid is discharged from the impeller 10 through the fluid outlet 300 and flows to the tongue.

[0045] Continue to refer to Figure 3 The blade 210 has a working surface 212 and a back surface 213. The working surface 212 and the back surface 213 are respectively located on opposite sides of the tail end face 211 along the axial direction of the base 100. When the impeller 10 rotates, the fluid is propelled by the working surface 212 of the blade 210 and flows towards the tongue. If the blade 210 propells the fluid towards the tongue at a fixed frequency, and the fluid flows towards the tongue at the same flow rate, the fluid will periodically sweep across the fixed position of the tongue, and periodic pressure pulsation will be generated at the tongue, resulting in a large order noise. However, if the blade 210 is arranged in a non-uniform manner, the point of action of the blade 210 propelling the fluid towards the tongue is separated, thereby reducing the order noise. On the contrary, it will deteriorate the dynamic balance performance of the impeller 10 and still cannot optimize the NVH performance of the impeller 10.

[0046] Based on this, this embodiment optimizes the NVH performance of the impeller 10 from the perspectives of pressure pulsation, order noise, and dynamic balance. Specifically, multiple blades 210 are arranged at equal intervals around the circumference of the base 100. The blades 210 are evenly distributed between the first cover plate 110 and the second cover plate 120, resulting in a more balanced mass distribution of the impeller 10. This improves the dynamic balance performance of the impeller 10, enabling it to rotate smoothly and reducing the operating noise of the water pump. In addition, the size of the outlet area directly affects the flow velocity of the fluid at the fluid outlet 300. In this embodiment, any two adjacent fluid outlets 300 are set to have different outlet areas. The fluid flowing out of adjacent fluid outlets 300 will have different flow velocities. Fluids with different flow velocities will flow to different positions of the tongue, causing the blades 210 to separate the points of action of the fluid against the tongue, thus dispersing the fluid energy and preventing the fluid energy from concentrating on the tongue, thereby reducing the pressure pulsation and order noise of the impeller 10.

[0047] In some embodiments, two fluid outlets 300 spaced apart from each other may have the same outlet area, and the outlet area of ​​these two fluid outlets 300 is different from the outlet area of ​​the fluid outlet 300 located between them. In this way, any two adjacent fluid outlets 300 can have different outlet areas. That is, the blade assembly 200 includes two types of fluid outlets 300 with different outlet areas, and the two are arranged alternately along the circumference of the base 100. In this way, the shape of the blade 210 of the blade assembly 200 can be simplified and the production cost of the impeller 10 can be reduced.

[0048] Understandably, the more fluid outlets 300 that are adjacent in position and have different outlet areas, the more dispersed the action point of the fluid towards the tongue, the higher the degree of dispersion of fluid energy, and the better the NVH performance of the impeller 10. In order to further disperse the action point of the fluid towards the tongue, multiple adjacent fluid outlets 300 can be further set with different areas, such as three, four, five, etc., with different outlet areas for each adjacent fluid outlet 300.

[0049] In one embodiment, reference is made to Figure 3 and Figure 4The blade assembly 200 includes at least two mixing units 220, each mixing unit 220 including n adjacent blades 210, the total number of blades 210 in the blade assembly 200 is x, 3≤n≤x / 2; each mixing unit 220 includes at least 3 adjacent blades 210, therefore, the mixing unit 220 includes at least two adjacent fluid outlets 300, within each mixing unit 220, any two fluid outlets 300 have different outlet areas, that is, the outlet areas of each fluid outlet 300 included in the mixing unit 220 are different, and the mixing unit 220 is provided with at least two, thereby increasing the number of fluid outlets 300 with different outlet areas, improving the dispersion of fluid to the action point of the tongue and the degree of dispersion of fluid energy.

[0050] Taking n=3 as an example, such as Figure 3 In the illustrated embodiment, x=14, the blade assembly 200 includes four mixing units 220 arranged circumferentially along the base 100. Each mixing unit 220 includes two adjacent fluid outlets 300, and adjacent fluid outlets 300 within each mixing unit 220 have different outlet areas. Alternatively, taking n=4 as an example, x=22, the blade assembly 200 includes five mixing units 220 arranged circumferentially along the base 100. Each mixing unit 220 includes three adjacent fluid outlets 300, and adjacent fluid outlets 300 within each mixing unit 220 have different outlet areas. Alternatively, taking n=5 as an example and x=10, the blade assembly 200 includes two mixing units 220, which are arranged circumferentially along the base 100. Each mixing unit 220 includes four adjacent fluid outlets 300, and the adjacent fluid outlets 300 in each mixing unit 220 have different outlet areas.

[0051] Furthermore, the outlet areas of two fluid outlets 300 belonging to adjacent mixing units 220 and adjacent to each other in the circumferential position of the base 100 are different. Thus, not only are the outlet areas of the fluid outlets 300 inside the mixing unit 220 different, but the outlet areas of adjacent fluid outlets 300 in different mixing units 220 are also different. This makes the difference in outlet area between fluid outlets 300 in the blade assembly 200 more obvious, further dispersing fluid energy and optimizing the NVH performance of the impeller 10.

[0052] In one embodiment, the outlet areas of any two fluid outlets 300 are different. In this way, the points of action of the fluids discharged from different fluid outlets 300 at the tongue will be completely separated, and there will be no overlapping points of action at the tongue, so as to maximize the dispersion of fluid energy and reduce pressure pulsation and order noise.

[0053] The different outlet areas of adjacent fluid outlets 300 can be achieved by changing the shape of the tail end face 211 of the blade 210 or the overall shape of the blade 210. For example, the tail end of the blade 210 can be rounded, the blade 210 can be thinned, or the tail end face 211 of the blade 210 can be tilted. For example, Figure 4 As shown, the tail end of some blades 210 is rounded to make the tail end face 211 an arc surface; or, the tail end face 211 of some blades 210 is inclined to the center of the base 100 along the direction from the second cover plate 120 toward the first cover plate 110; or, the tail of some blades 210 is thinned so that the working surface 212 of the tail area of ​​the blade 210 gradually approaches the back surface 213 along the direction toward the tail end face 211; or, the tail end face 211 of some blades 210 is beveled and consists of two bevels at an angle to each other, making the tail end of the blade 210 V-shaped; or, the outer diameter of some blades 210 is reduced.

[0054] Understandably, by treating the blades 210 in the above manner, the spacing between the tail end faces 211 of adjacent blades 210 in the circumferential direction of the base 100 can be adjusted, thereby changing the outlet area of ​​the fluid outlet 300 and making adjacent fluid outlets 300 have different outlet areas. At the same time, the improvement of the blades 210 is concentrated at the tail end, without changing the overall blade shape of the blades 210, and will not affect the original fluid performance of the blade assembly 200. In addition, setting the tail end face 211 as an arc surface, a slope, and thinning the tail end of the blades 210 can increase the spacing between the tail end faces 211 of adjacent blades 210 in the circumferential direction of the base 100 and the outlet area of ​​the fluid outlet 300. The flow velocity of the fluid discharged through the fluid outlet 300 is reduced, which can reduce the force of the fluid at the tongue, thereby reducing pressure pulsation. At the same time, the blade assembly 200 can be integrally molded by injection molding, without the need for additional secondary processing of the blades 210 after molding. The processing of the impeller 10 is more convenient and the production cost is low.

[0055] The blade 210 with a rounded end face 211 is defined as the first blade 214, the blade 210 with an inclined end face 211 is defined as the second blade 215, and the blade 210 with a thinned end is defined as the third blade 216. The blade assembly 200 includes at least one of the first blade 214, the second blade 215 and the third blade 216 to more conveniently change the outlet area of ​​the fluid outlet 300.

[0056] In some embodiments, the rounded corner angle of the first blade 214 is 0.5°-1°, and is not limited to 0.5°, 0.6°, 0.7°, 0.8°, 0.9°, or 1°; the angle of inclination of the tail end face 211 of the second blade 215 relative to the periphery of the substrate 100 toward the center of the substrate 100 is α, 15°≤α≤25°, and α is not limited to 15°, 18°, 20°, 22°, or 25°; the angle between the tangent of the thinned portion of the back surface 213 of the third blade 216 and the curved surface of the thinned portion is β, 5°≤β≤8°, and β is not limited to 5°, 6°, 7°, or 8°.

[0057] Understandably, the blades 210 in the blade assembly 200 can be configured as other types of blades besides the first blade 214, the second blade 215, and the third blade 216. For example, the blade assembly 200 may also include blades 210 that retain the original tail end face 211 without further processing; or the blade assembly 200 may include blades 210 whose tail end face 211 has been beveled. In one embodiment, the blades 210 in the blade assembly 200 are configured as the first blade 214, the second blade 215, or the third blade 216, and the blade assembly 200 does not include other types of blades 210, in order to simplify the structure of the blade assembly 200 and enable the blade assembly 200 to be integrally formed, making the processing of the blade assembly 200 more convenient.

[0058] The mixing unit 220 can be further configured to include at least one of a first blade 214, a second blade 215, and a third blade 216, to facilitate the different outlet areas of each fluid outlet 300 within the mixing unit 220. The mixing unit 220 may include one of the first blade 214, the second blade 215, and the third blade 216. In this case, all blades 210 in the mixing unit 220 can be of the same type, i.e., all blades 210 in the mixing unit 220 are first blades 214, or all blades 210 are second blades 215, or all blades 210 are third blades 216. Taking the example that all blades 210 in one mixing unit 220 are first blades 214, the outlet area of ​​the fluid outlet 300 can be changed by adjusting the curvature of the arc surfaces of adjacent first blades 214, so that adjacent fluid outlets 300 have different outlet areas. In addition, the blades 210 in different mixing units 220 can be configured to different types. For example, the blades 210 in one mixing unit 220 are all first blades 214, and the blades 210 in another mixing unit 220 are all second blades 215.

[0059] Alternatively, the mixing unit 220 may include two of the first blade 214, the second blade 215, and the third blade 216; or the mixing unit 220 may include the first blade 214, the second blade 215, and the third blade 216; of course, the mixing unit 220 may also include other types of blades 210 besides the first blade 214, the second blade 215, and the third blade 216.

[0060] In one embodiment, n=3, such as Figure 4 As shown, the mixing unit 220 includes three blades 210, which are a first blade 214, a second blade 215, and a third blade 216. That is, each mixing unit 220 contains only the first blade 214, the second blade 215, and the third blade 216, which helps simplify the structure of the blade assembly 200, improve the ease of processing the blade assembly 200, and optimize the NVH performance of the impeller 10. Figure 4 In the embodiment shown, the blade assembly 200 includes 14 blades 210. For the case of n=3, the blade assembly 200 includes 4 mixing units 220 and two blades 210 disposed outside the mixing units 220. Both blades 210 can be configured as one of the first blade 214, the second blade 215 and the third blade 216.

[0061] It should be noted that, for the case where there are only the first blade 214, the second blade 215, and the third blade 216 in the mixing unit 220, the arrangement order of the blades 210 in different mixing units 220 can be the same or different. For the case where the arrangement order of different types of blades 210 in different mixing units 220 is the same, for example, the arrangement order of the blades 210 in each mixing unit 220 is: the first blade 214, the second blade 215, and the third blade 216 are arranged sequentially along the circumference of the base 100; or, the arrangement order of the blades 210 in each mixing unit 220 is: the second blade 215, the first blade 214, and the third blade 216 are arranged sequentially along the circumference of the base 100; or, the arrangement order of the blades 210 in each mixing unit 220 is: the second blade 215, the third blade 216, and the first blade 214 are arranged sequentially along the circumference of the base 100.

[0062] In cases where the arrangement order of different types of blades 210 in different mixing units 220 is different, and the outlet areas of adjacent fluid outlets 300 in the mixing unit 220 are different, the first blade 214, the second blade 215 and the third blade 216 can be randomly arranged and combined to further separate the fluid to the action point of the tongue, effectively disperse the fluid energy, and reduce pressure pulsation and order noise.

[0063] Based on this, it can be further configured that two blades 210 belonging to adjacent mixing units 220 and adjacent to each other along the circumference of the base 100 are respectively set as two of the first blade 214, the second blade 215 and the third blade 216. That is, the two blades 210 belonging to different mixing units 220 and adjacent to each other are of different types, so as to achieve differentiated processing of the outlet area of ​​adjacent fluid outlets 300 and further stagger the action point of fluid to the tongue, thereby improving the NVH performance of the impeller 10.

[0064] Reference Figure 5 This invention uses five monitoring points (A, B, C, D, and E) spaced circumferentially along the volute as monitoring points, where point A is the position of the tongue. By monitoring the pressure pulsation at these five points, pressure pulsation spectrum curves are obtained for each of the five points. Figure 6 The pressure spectrum obtained in the first embodiment is as follows: the blade assembly 200 includes only the first blade 214, the second blade 215 and the third blade 216, and the outlet areas of adjacent fluid outlets 300 are different; Figure 7 The pressure spectrum obtained in the second embodiment is as follows: the blade assembly 200 includes only the first blade 214, the third blade 216, and the blade 210 with a reduced outer diameter, and the outlet areas of adjacent fluid outlets 300 are different. Figure 8 The pressure spectrum obtained in the third embodiment is as follows: the middle blade 210 of the blade assembly 200 is not processed and retains its original shape.

[0065] Depend on Figure 6 It can be seen that the maximum pressure pulsation value in the first embodiment is 780 Pa, and the maximum pressure pulsation does not occur at the tongue. Figure 7 It can be seen that the maximum pressure pulsation value in the second embodiment is 900 Pa, and the maximum pressure pulsation is located at the tongue. Figure 8 It is known that the maximum pressure pulsation value in the third embodiment is 1100 Pa, and the maximum pressure pulsation is located at the tongue. Therefore, by adjusting the tail end of the blade 210 to make the outlet areas of adjacent fluid outlets 300 different, pressure pulsation and order noise can be reduced, improving the NVH performance of the impeller 10. The blade assembly 200, which only includes the first blade 214, the second blade 215, and the third blade 216, compared to a blade assembly 200 that also includes other types of blades 210, can guide the maximum pressure pulsation to a position away from the tongue, resulting in superior NVH performance.

[0066] In one embodiment, adjacent blades 210 have different lengths. Understandably, the working surface 212 of the longer blade 210 is longer than that of the shorter blade 212. Since the tail end of the blade 210 extends to the periphery of the base 100, the end of the longer blade 210 facing away from the tail end is closer to the center of the base 100 than the shorter blade 210. After the fluid enters the volute axially, it will first come into contact with the longer blade 210 and be continuously pushed by the working surface 212 of the blade 210. The longer blade 210 has a greater pushing force on the fluid. Thus, by setting adjacent blades 210 to have different lengths, the pushing force of adjacent blades 210 on the fluid is different. The fluid discharged from adjacent fluid outlets 300 has a different force on the tongue, thereby increasing the degree of separation of the fluid action point at the tongue, further dispersing the fluid energy, and reducing pressure pulsation and order noise.

[0067] It should be noted that multiple adjacent blades 210 can also be configured to have different lengths; for example, in the blade assembly 200, every two adjacent blades 210 have different lengths; or, in the blade assembly 200, every three adjacent blades 210 have different lengths, and along the circumference of the base 100, the lengths of the three blades 210 decrease sequentially, further dispersing the action point at the tongue. In some embodiments, any two blades 210 within the mixing unit 220 can be configured to have different lengths. Thus, within the mixing unit 220, the flow velocity of the fluid flowing out of adjacent fluid outlets 300 and the force of the fluid's action on the tongue are different, further separating the action point of the blades 210 pushing the fluid towards the tongue and dispersing the fluid energy.

[0068] In one embodiment, such as Figure 3 and Figure 4 As shown, adjacent blades 210 are configured with different lengths. The blade assembly 200 includes x blades 210, of which x / 2 blades 210 are long blades 210 and x / 2 blades 210 are short blades 210. The length of the long blades 210 is greater than the length of the short blades 210. The long blades 210 and short blades 210 are arranged alternately along the circumference of the base 100. On the one hand, the fluid can be separated from the point of action of the tongue by the fluid velocity and the force of the fluid on the tongue, which can enhance the effect of fluid energy dispersion and reduce pressure pulsation. On the other hand, the number of long blades 210 and short blades 210 is the same and they are arranged at intervals, so the distribution of the blades 210 is more uniform and can improve the dynamic balance performance of the impeller 10.

[0069] Furthermore, the blades 210 are typically curved. The length of the blade 210 is defined as the curve length formed by the extension path of the blade 210. The length of the long blade 210 is L1, and the length of the short blade 210 is L2. In one embodiment, L1 < 2L2 to limit the degree of reduction in the length of the short blade 210, thereby reducing the impact of setting the short blade 210 on the conveying capacity of the impeller 10.

[0070] like Figure 3 and Figure 4 In the illustrated embodiment, the blade assembly 200 includes 7 long blades 210 and 7 short blades 210; in other embodiments, the blade assembly 200 includes 5 long blades 210 and 5 short blades 210; or, the blade assembly 200 includes 11 long blades 210 and 11 short blades 210.

[0071] For the mixing unit 220, which includes three blades 210, namely the first blade 214, the second blade 215 and the third blade 216, and the long blades 210 and the short blades 210 are arranged alternately along the circumference of the base 100, the combination of the blade type and the length of the blades 210 increases the difference in the outlet area of ​​adjacent fluid outlets 300, further staggers the action point of the fluid towards the tongue, and reduces pressure pulsation and order noise.

[0072] The present invention also provides an electronic water pump, as described above. Figure 9 The electronic water pump includes a motor 20 and the aforementioned impeller 10. The motor is connected to the impeller 10 and drives the impeller 10 to rotate. When the impeller 10 rotates, the blades 210 agitate the fluid, thereby transporting the fluid. The number of pole pairs y is a measure of the number of magnetic poles in the motor, representing the number of N and S pole pairs. The number of slots z is the number of recesses in the stator core used to house the winding coils. For example, a 4-pole, 6-slot motor includes 4 magnetic poles, with a pole pair number y = 2, and the stator core includes 6 winding slots, with the number of slots z = 6; a 6-pole, 9-slot motor includes 6 magnetic poles, with a pole pair number y = 3, and the stator core includes 9 winding slots, with the number of slots z = 9. Understandably, for a three-phase motor, z is a multiple of 3.

[0073] When the motor is running, the magnetic field generated by the energized coil acts on the magnet, producing a periodic electromagnetic force. The electromagnetic excitation frequency of the motor is related to the number of pole pairs y and the number of slots z. If the passing frequency of the blade 210 in the impeller 10 is the same as the electromagnetic excitation frequency of a certain order of the motor, this causes the fluid excitation and electromagnetic excitation to be synchronously superimposed at the same frequency point, resulting in resonance. Based on this, in this embodiment, x / 2 and y are set to be coprime numbers, and z / 3 and y are set to be coprime numbers, so that the passing frequency of the blade 210 and the electromagnetic excitation of the motor are staggered in the lower order range, dispersing the excitation energy, thereby reducing the risk of resonance between the impeller 10 and the motor and optimizing the NVH performance of the electric water pump.

[0074] x / 2 can be set to 5, 7, 11, etc. For conventional 4-pole 6-slot motors and 6-pole 9-slot motors, x / 2 can be a prime number relative to the number of pole pairs y and the number of slots z / 3, so that the impeller 10 can be adapted to the NVH requirements of different types of motors and improve the versatility of the impeller 10.

[0075] like Figure 3 and Figure 4 In the illustrated embodiment, the impeller 10 includes 14 blades 210, i.e., x / 2=7. In some embodiments, the motor 20 includes 6 magnets arranged circumferentially around the rotor core. Three of the 6 magnets are N poles and the other three are S poles, with the number of pole pairs y=3. x / 2 and y are coprime numbers.

[0076] Figure 10 The diagram shows the pressure pulsation spectrum at five points A, B, C, D, and E when the blade assembly 200 includes nine blades 210. Figure 10 It can be seen that the highest pressure pulsation value is 2500 Pa, and the highest pressure pulsation value appears in the spectrum of the value point A. Therefore, the highest pressure pulsation value is at the tongue. Since x=9, for a 4-pole 6-slot motor and a 6-pole 9-slot motor, x / 2 and z / 3 cannot form a prime number relationship. This causes the 9-blade impeller 10 to be affected by resonance, resulting in a large pressure pulsation.

[0077]

[0078] Table 1

[0079] As shown in Table 1, for impellers 10 with the same flow rate, the 14-blade impeller 10 has lower noise than the 9-blade impeller 10, and the 14-blade impeller 10 has better NVH performance.

[0080] The present invention also provides a vehicle comprising the aforementioned electronic water pump. The vehicle can be a private car, such as a sedan, SUV, MPV, or pickup truck, or a commercial vehicle, such as a van, bus, small truck, or large semi-trailer. The vehicle can be a gasoline-powered vehicle or a new energy vehicle; when it is a new energy vehicle, it can be a hybrid vehicle or a pure electric vehicle.

[0081] For example, when the vehicle is a gasoline vehicle, the electronic water pump can be used for preheating and cooling after the engine is turned off, cooling of the turbocharger, or independent air conditioning circulation; when the vehicle is a new energy vehicle, the electronic water pump can be used for cooling high heat load components such as battery packs, drive motors, and motor controllers.

[0082] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments, and various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention. Furthermore, the embodiments of the present invention and the features thereof can be combined with each other unless otherwise specified.

Claims

1. An impeller, characterized in that, include: The substrate includes a first cover plate and a second cover plate spaced apart along the axial direction; A blade assembly is disposed between the first cover plate and the second cover plate. The blade assembly includes a plurality of blades. The blades are connected to the first cover plate and the second cover plate on opposite sides along the axial direction, and the blades are arranged at equal intervals around the circumference of the base. The blade extends to one end of the periphery of the substrate and has a tail end face. The tail end faces of adjacent blades, the first cover plate and the second cover plate define a fluid outlet. Any two adjacent fluid outlets have different outlet areas. The different outlet areas of adjacent fluid outlets are achieved by changing the tail end face of the blade.

2. The impeller according to claim 1, characterized in that, The blade assembly includes x blades, and n adjacent blades form a mixing unit. The blade assembly includes at least two mixing units, where 3 ≤ n ≤ x / 2; wherein, Within each of the mixing units, any two fluid outlets have different outlet areas; And / or, belonging to adjacent mixing units, and having different outlet areas for two fluid outlets that are circumferentially adjacent along the matrix.

3. The impeller according to claim 1, characterized in that, Any two fluid outlets have different outlet areas.

4. The impeller according to claim 2, characterized in that, The blade has a working surface and a back surface, which are located on opposite sides of the tail end face along the circumference of the base. The blade with the tail end face being an arc surface is defined as the first blade. The blade with the tail end face inclined towards the center of the base along the direction of the second cover plate toward the first cover plate is the second blade. The blade with the working surface gradually approaching the back surface along the direction toward the tail end face is the third blade. The blade assembly includes at least one of the first blade, the second blade, and the third blade.

5. The impeller according to claim 4, characterized in that, The mixing unit includes at least one of the first blade, the second blade, and the third blade; Alternatively, the mixing unit may include the first blade, the second blade, and the third blade, where n=3.

6. The impeller according to claim 4, characterized in that, The two blades that belong to adjacent mixing units and are adjacent to each other along the circumferential direction of the substrate are respectively configured as two of the first blade, the second blade and the third blade.

7. The impeller according to any one of claims 1 to 6, characterized in that, The lengths of adjacent blades are different.

8. The impeller according to claim 7, characterized in that, The blade assembly includes x blades, of which x / 2 blades are long blades and x / 2 blades are short blades. The length of the long blades is greater than the length of the short blades, and the long blades and the short blades are arranged alternately along the circumference of the substrate.

9. An electronic water pump, characterized in that, include: The impeller according to any one of claims 1 to 8, wherein the blade assembly comprises x blades; An electric motor is connected to the impeller and is used to drive the impeller to rotate. The number of pole pairs of the motor is y, the number of slots of the motor is z, x / 2 and y are relatively prime numbers, and x / 2 and z / 3 are relatively prime numbers.

10. A vehicle, characterized in that, Includes the electronic water pump as described in claim 9.

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