Impeller assembly, electronic water pump, thermal management system and vehicle

Abstract

The utility model discloses an impeller assembly, an electronic water pump, a heat management system and a vehicle, the rotation direction of the impeller assembly is a set direction, and the impeller assembly comprises a first end plate and a second end plate; the multiple blades are arranged between the first end plate and the second end plate, the ends, close to the rotating axis of the impeller assembly, of the blades are the inner ends of the blades, and the ends, away from the rotating axis of the impeller assembly, of the blades are the outer ends of the blades. The upstream side face, in the set direction, of the blade is in smooth transition connection with the outer end face of the blade through a transition face, and the transition face is located between the outer end tangent plane of the upstream side face of the blade and the downstream side face of the blade. According to the impeller assembly, the pressure pulsation near the volute tongue of the electronic water pump can be smaller, so that the NVH performance of the electronic water pump is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic water pumps, and more specifically, to an impeller assembly, an electronic water pump, a thermal management system and a vehicle. Background Art

[0002] Electronic water pumps are widely used due to their high efficiency and precise control. However, in related technologies, the pressure pulsations generated by water impacting the volute tongue are large, resulting in high operating noise and affecting the NVH (Noise, Vibration, and Harshness) performance of the electronic water pump. Utility Model Content

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one object of the present invention is to provide an impeller assembly that can reduce pressure pulsation at the volute of an electronic water pump, thereby improving the NVH performance of the electronic water pump.

[0004] The utility model also provides an electronic water pump having the impeller assembly.

[0005] The utility model also provides a thermal management system with the electronic water pump.

[0006] The utility model also provides a vehicle with the above thermal management system.

[0007] According to the impeller assembly of the electronic water pump of an embodiment of the present invention, the rotation direction of the impeller assembly is a set direction, and the impeller assembly includes: a first end plate and a second end plate; a plurality of blades, and the plurality of blades are arranged between the first end plate and the second end plate, the end of the blade close to the rotation axis of the impeller assembly is the inner end of the blade, and the end of the blade away from the rotation axis of the impeller assembly is the outer end of the blade, and the upstream side surface of the blade in the set direction is smoothly connected to the outer end surface of the blade through a transition surface, and the transition surface is located between the outer end section of the upstream side surface of the blade and the downstream side surface of the blade.

[0008] According to the impeller assembly of the electronic water pump in the embodiment of the present invention, the upstream side surface of the blade in the set direction is smoothly connected to the outer end surface of the blade through a transition surface. The transition surface is located between the outer end section of the upstream side surface of the blade and the downstream side surface of the blade. Thus, the transition surface allows the liquid to enter the volute flow channel relatively smoothly, thereby helping to reduce the impact of the liquid on the volute tongue, reduce the pressure pulsation at the volute tongue, and improve the NVH performance of the electronic water pump during operation.

[0009] In addition, the impeller assembly of the electronic water pump according to the above embodiment of the present invention may also have the following additional technical features:

[0010] According to some embodiments of the present invention, a cross-section of the transition surface perpendicular to the rotation axis of the impeller assembly is arc-shaped, and the arc is convex in a direction away from the downstream side surface.

[0011] According to some embodiments of the present invention, the arc is a circular arc.

[0012] According to some embodiments of the present invention, the distance between the upstream side surface of the blade and the downstream side surface of the blade is 1.1 mm to 2 mm, and the curvature radius of the transition surface is ≥5 mm.

[0013] According to some embodiments of the present invention, the curvature radius of the transition surface is ≤10 mm.

[0014] According to some embodiments of the present invention, along the circumference of the impeller assembly, the size of the outer end surface of the blade is ≥0.5 mm.

[0015] According to some embodiments of the present invention, at least one of the first end plate and the second end plate is integrally injection-molded with the blade.

[0016] The electronic water pump according to the embodiment of the present invention includes the impeller assembly of the electronic water pump according to the embodiment of the present invention.

[0017] According to some embodiments of the present invention, the electronic water pump includes a casing and a pump cover, the pump cover is arranged on the casing and cooperates with the casing to define a pump chamber, the impeller assembly is rotatably located in the pump chamber, the peripheral wall of the pump chamber is provided with a fluid outlet, and a volute is provided at the fluid outlet.

[0018] The thermal management system according to the embodiment of the present invention includes the electronic water pump according to the embodiment of the present invention.

[0019] A vehicle according to an embodiment of the present invention includes a thermal management system according to an embodiment of the present invention.

[0020] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0022] Figure 1 is a cross-sectional view of an electronic water pump according to an embodiment of the present utility model;

[0023] Figure 2 This is a partial structural diagram of an electronic water pump according to an embodiment of the present utility model;

[0024] Figure 3 for Figure 2 A partial enlarged view of part A;

[0025] Figure 4 is a partial structural diagram of an electronic water pump according to another embodiment of the present utility model;

[0026] Figure 5 for Figure 4 A partial enlarged view of part B;

[0027] Figure 6 A simulation graph showing the pressure variation with the rotation angle of the impeller assembly for the comparative example, embodiment 1, and embodiment 2 when the position near the end of the volute tongue away from the housing is used as the first pressure collection point and the flow rate of the electronic water pump is 20 L / min;

[0028] Figure 7 A simulation graph showing the pressure variation with the rotation angle of the impeller assembly for the comparative example, Example 1, and Example 2 when the position near the end of the volute tongue away from the housing is used as the first pressure collection point and the flow rate of the electronic water pump is 37 L / min;

[0029] Figure 8 The figure shows the simulation curves of the pressure change with the rotation angle of the impeller assembly in the comparative example, embodiment 1 and embodiment 2 when the outer flow channel is located at a point outside the volute tongue as the second pressure collection point and the flow rate of the electronic water pump is 20L / min;

[0030] Figure 9 The figure shows the simulation curves of the pressure change with the rotation angle of the impeller assembly in the comparative example, embodiment 1 and embodiment 2 when the outer flow channel is located at a point outside the volute tongue as the second pressure collection point and the flow rate of the electronic water pump is 37 L / min;

[0031] Figure 10 Schematic diagram of a vehicle according to an embodiment of the present invention.

[0032] Reference numerals:

[0033] Electronic water pump 100; impeller assembly 10; thermal management system 1000; vehicle 2000;

[0034] First end plate 1; outer peripheral surface 101 of first end plate 1; second end plate 2; outer peripheral surface 201 of second end plate 2;

[0035] Blade 3; set direction F1; upstream side surface 301; downstream side surface 302; outer end surface 303; inner end surface 304;

[0036] Transition surface 305; housing 20; pump cover 30; pump chamber 40; fluid outlet 50;

[0037] Volute tongue 60; rotor assembly 70; first pressure collection point P17; second pressure collection point P23. DETAILED DESCRIPTION

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

[0039] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0040] In the description of the present invention, "first feature" and "second feature" may include one or more such features, "plurality" means two or more, the first feature "above" or "below" the second feature may include the first and second features being in direct contact, or the first and second features not being in direct contact but being in contact through another feature between them, the first feature "above", "above" and "above" the second feature include the first feature being directly above and diagonally above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0041] In the related art, the electronic water pump includes an impeller assembly, which includes end plates and blades arranged between the end plates. The upstream side of the blade in the rotation direction of the impeller assembly directly intersects with the outer end face of the impeller to form a straight edge. The distance directly flowing along the upstream side of the blade to the volute tongue is short, and the impact force on the volute tongue is large, resulting in large pressure pulsation at the volute tongue, which has an adverse effect on the NVH performance of the electronic water pump.

[0042] In order to improve the NVH performance of an electronic water pump, the present application proposes an impeller assembly 10. The impeller assembly 10 according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

[0043] Reference Figures 1 to 5 As shown, the impeller assembly 10 of the electronic water pump 100 according to the embodiment of the present invention may include: a first end plate 1 , a second end plate 2 and a plurality of blades 3 .

[0044] Specifically, the rotation direction of the impeller assembly 10 is the set direction F1. For example, the rotation direction of the impeller assembly 10 can be clockwise (e.g., Figure 1 Alternatively, the direction of rotation of the impeller assembly 10 may be counterclockwise.

[0045] Multiple blades 3 are disposed between the first end plate 1 and the second end plate 2. The end of the blade 3 closest to the rotation axis of the impeller assembly 10 is the inner end of the blade 3, and the end of the blade 3 farther from the rotation axis of the impeller assembly 10 is the outer end of the blade 3. In other words, the end of the blade 3 closest to the middle of the first end plate 1 and the middle of the second end plate 2 is the inner end of the blade 3, and the end of the blade 3 farther from the middle of the first end plate 1 and the middle of the second end plate 2 is the outer end of the blade 3. The blades 3, the first end plate 1, and the second end plate 2 collectively define a flow path for liquid flow. Liquid entering the impeller assembly 10 flows from the inner end of the blade 3 to the outer end of the blade 3 under the action of centrifugal force, and then leaves the impeller assembly 10 and enters the volute flow path surrounding the impeller assembly 10.

[0046] It should be noted that the electronic water pump 100 includes a housing 20 and a pump cover 30. The pump cover 30 is mounted on the housing 20 and cooperates with the housing 20 to define a pump chamber 40. The impeller assembly 10 is rotatably positioned within the pump chamber 40. A fluid outlet 50 is provided on the peripheral wall of the pump chamber 40, and a volute 60 is provided at the fluid outlet 50. The volute 60 is a sharp-angled structure at the intersection of the starting point of the spiral line of the volute flow channel of the pump chamber 40 and the fluid outlet 50. Apart from this, the volute flow channel has no other sharp angles, resulting in large pressure pulsations at the volute 60. After the liquid in the pump chamber 40 passes through the impeller assembly 10, it is divided into a low-pressure area on one side and a high-pressure area on the other side, with the volute 60 as the boundary. The high-pressure area is converted into kinetic energy through the fluid outlet 50.

[0047] However, in the related art, the distance that the liquid flowing along the upstream side of the blade and directly impacting the volute tongue flows to the volute tongue is too short, resulting in excessive pressure pulsation at the volute tongue and poor NVH performance of the electronic water pump during operation. In the impeller assembly 10 of the embodiment of the present invention, the upstream side 301 of the blade 3 in the set direction F1 is connected to the outer end surface 303 of the blade 3 by a transition surface 305 in a smooth transition. The transition surface 305 is located between the outer end section of the upstream side 301 of the blade 3 and the downstream side 302 of the blade 3. As a result, the transition surface 305 allows the liquid to enter the volute flow channel relatively smoothly, thereby helping to reduce the impact of the liquid on the volute tongue 60, thereby reducing the pressure pulsation near the volute tongue 60 and improving the NVH performance of the electronic water pump 100 during operation.

[0048] For the same blade 3, the direction from the downstream side surface 302 of the blade 3 to the upstream side surface 301 of the blade 3 is the set direction F1, for example, Figure 1 As shown, for the same blade 3, the direction from the downstream side surface 302 of the blade 3 to the upstream side surface 301 of the blade 3 is clockwise. The upstream side surface 301 of the blade 3 in the set direction F1 is smoothly connected to the outer end surface 303 of the blade 3 via a transition surface 305. In other words, the upstream side surface 301 of the blade 3 is tangent to the transition surface 305, and the outer end surface 303 of the blade 3 is tangent to the transition surface 305. Among the multiple blades 3 of the impeller assembly 10, only some of the blades 3 may be provided with a transition surface 305, or all of the blades 3 in the impeller assembly 10 may be provided with a transition surface 305.

[0049] According to the impeller assembly 10 of the embodiment of the present invention, the upstream side surface 301 of the blade 3 in the set direction F1 is smoothly connected to the outer end surface 303 of the blade 3 through a transition surface 305. The transition surface 305 is located between the outer end section of the upstream side surface 301 of the blade 3 and the downstream side surface 302 of the blade 3. Thus, the transition surface 305 allows the liquid to enter the volute flow channel relatively smoothly, thereby reducing the impact of the liquid on the volute tongue 60, reducing the pressure pulsation at the volute tongue 60, and improving the NVH performance of the electronic water pump 100 during operation.

[0050] According to some embodiments of the present invention, Figure 1As shown, the cross-section of the transition surface 305 perpendicular to the rotation axis of the impeller assembly 10 is arc-shaped, and the arc protrudes in the direction away from the downstream side surface 302. In this way, the connection between the upstream side surface 301 of the blade 3 and the outer end surface of the blade 3 is smoother, and the flow of the liquid along the upstream side surface 301 of the blade 3 is more stable and less likely to generate vortices, which is beneficial to optimizing the NVH performance of the electronic water pump 100 during operation. Specifically, the curvature radius of the transition surface 305 with an arc-shaped cross-section can be equal at all locations, or the curvature radius of the transition surface 305 with an arc-shaped cross-section can also be unequal. For example, the curvature radius of the transition surface 305 with an arc-shaped cross-section can also gradually increase or decrease along the direction from the upstream side surface 301 to the outer end surface 303.

[0051] In other embodiments, the cross-section of the transition surface 305 perpendicular to the rotation axis of the impeller assembly 10 is arc-shaped, and the arc is concave in the direction close to the downstream side surface 302, which should also be within the scope of protection of this application.

[0052] According to some embodiments of the present invention, reference can be made to Figures 1 to 5 As shown, the arc is a circular arc.

[0053] That is to say, the curvature radius of each part of the cross section of the transition surface 305 is equal, so that the processing difficulty of the mold used for processing the blade 3 is low, which is conducive to reducing the processing cost of the blade 3.

[0054] In some embodiments, as Figures 2 to 4 As shown, the boundary line between the transition surface 305 and the outer end surface 303 is a straight line extending along the axial direction of the impeller assembly 10, and the intersection line between the transition surface 305 and the upstream side surface 301 is a straight line extending along the axial direction of the impeller assembly 10. In this way, when producing the blade 3, it is convenient to demould along the axial direction of the impeller assembly 10.

[0055] According to some embodiments of the present invention, reference can be made to Figure 1 The distance D between the upstream side surface 301 of the blade 3 and the downstream side surface 302 of the blade 3 is 1.1 mm to 2 mm, and the curvature radius of the transition surface 305 is ≥5 mm.

[0056] That is to say, compared with not setting a transition surface, under the premise that the distance D between the upstream side surface 301 of the blade 3 and the downstream side surface 302 of the blade 3 is 1.1mm~2mm, when the curvature radius of the transition surface 305 is ≥5mm, the pressure pulsation at the volute tongue 60 is significantly reduced.

[0057] Figure 6A simulation graph showing pressure variations with the rotation angle of the impeller assembly 10 is shown, with the position near the end of the volute 60 away from the housing 20 being the first pressure collection point P17 and the flow rate of the electronic water pump 100 being 20 L / min, when the blade 3 is not provided with a transition surface 305 (comparative example), the curvature radius of the transition surface 305 of the blade 3 is 5 mm (Example 1), and the curvature radius of the transition surface 305 of the blade 3 is 10 mm (Example 2); Figure 7 A simulation curve diagram is shown of the pressure variation with the rotation angle of the impeller assembly 10 when the position near the end of the volute 60 away from the casing 20 is used as the first pressure collection point P17 and the flow rate of the electronic water pump 100 is 37 L / min, the blade 3 is not provided with a transition surface 305 (comparative example), the curvature radius of the transition surface 305 of the blade 3 is 5 mm (Example 1), and the curvature radius of the transition surface 305 of the blade 3 is 10 mm (Example 2); wherein the ordinate of the simulation curve diagram is pressure, and the abscissa of the simulation curve diagram is time step, wherein 3° is one time step, there are 120 collection steps in the figure, and a total of 360° is collected.

[0058] Figure 8 Graphs illustrating simulations of pressure changes with the rotation angle of the impeller assembly 10 when the outer flow channel is located at a point outside the volute tongue 60 as the second pressure collection point P23 and the flow rate of the electronic water pump 100 is 20 L / min, the blade 3 is not provided with a transition surface 305 (comparative example), the curvature radius of the transition surface 305 of the blade 3 is 5 mm (Example 1), and the curvature radius of the transition surface 305 of the blade 3 is 10 mm (Example 2); Figure 9 A simulation curve diagram is shown of the pressure variation with the rotation angle of the impeller assembly 10 when the outer flow channel is located at a point outside the volute tongue 60 as the second pressure collection point P23 and the flow rate of the electronic water pump 100 is 37 L / min, the blade 3 is not provided with a transition surface 305 (comparative example), the curvature radius of the transition surface 305 of the blade 3 is 5 mm (Example 1), and the curvature radius of the transition surface 305 of the blade 3 is 10 mm (Example 2); wherein the ordinate of the simulation curve diagram is pressure, and the abscissa of the simulation curve diagram is time step, wherein 3° is one time step, there are 120 time steps in the figure, and a total of 360° is collected.

[0059] The pressure pulsation is the difference between the pressure peak and the pressure valley in a cycle in the simulation curve of the pressure change with the rotation angle of the impeller assembly 10. The larger the difference, the greater the pressure pulsation, and the smaller the difference, the smaller the pressure pulsation. Figures 6 to 9As shown, compared with no transition surface, the pressure pulsation near the volute tongue 60 when the curvature radius of the transition surface 305 is 5 mm and the pressure pulsation near the volute tongue 60 when the curvature radius of the transition surface 305 is 10 mm are both significantly reduced, and the larger the curvature radius of the transition surface 305, the smaller the pressure pulsation near the volute tongue 60.

[0060] Among them, the distance between the upstream side surface 301 of the blade 3 and the downstream side surface 302 of the blade 3 can remain unchanged along the inner end of the blade 3 to the outer end of the blade 3; or, the distance between the upstream side surface 301 of the blade 3 and the downstream side surface 302 of the blade 3 can first increase, then decrease, and then increase again along the inner end of the blade 3 to the outer end of the blade 3; or, the distance between the upstream side surface 301 of the blade 3 and the downstream side surface 302 of the blade 3 can gradually increase along the inner end of the blade 3 to the outer end of the blade 3, and so on.

[0061] For example, the distance D between the upstream side surface 301 of the blade 3 and the downstream side surface 302 of the blade 3 may gradually increase from 1.1 mm to 2 mm from the inner end to the outer end of the blade 3. Correspondingly, the radius of curvature of the transition surface 305 is ≥ 5 mm. For example, the radius of curvature of the transition surface 305 may be 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, etc., without specific limitation herein.

[0062] According to some embodiments of the present invention, the curvature radius of the transition surface 305 is less than or equal to 10 mm.

[0063] For example, the radius of curvature of the transition surface 305 is 10 mm, 9 mm, 8 mm, 7 mm, 6 mm, 5 mm, or any value between any two of these values. The radius of curvature of the transition surface 305 is less than or equal to 10 mm and greater than or equal to 5 mm. In this way, the pressure pulsation near the volute 60 can be reduced, and at the same time, the head and working efficiency of the electronic water pump 100 will not change significantly, or in other words, the head and working efficiency will not be greatly reduced.

[0064] For example, Table 1 shows the lift and efficiency of the electronic water pump 100 when the flow rate of the electronic water pump 100 is 20 L / min, the blade 3 is not provided with a transition surface 305 (comparative example), the curvature radius of the transition surface 305 of the blade 3 is 5 mm (Example 1), and the curvature radius of the transition surface 305 of the blade 3 is 10 mm (Example 2).

[0065] Table 1

[0066] 20L / min Comparative Example Example 1 Example 2 Lift m 13.712 13.638 13.638 efficiency% 63.867 64.121 64.302

[0067] For example, Table 2 shows the lift and efficiency of the electronic water pump 100 when the flow rate of the electronic water pump 100 is 37 L / min, the blade 3 is not provided with a transition surface 305 (comparative example), the curvature radius of the transition surface 305 of the blade 3 is 5 mm (Example 1), and the curvature radius of the transition surface 305 of the blade 3 is 10 mm (Example 2).

[0068] Table 2

[0069] 37L / min Comparative Example Example 1 Example 2 Lift m 10.959 10.831 10.843 efficiency% 66.054 66.001 66.277

[0070] It can be concluded from Table 1 and Table 2 that, compared with the case where the blade 3 is not provided with the transition surface 305, the head and efficiency of the electronic water pump 100 do not change significantly when the curvature radius of the transition surface 305 of the blade 3 is 5 mm and the curvature radius of the transition surface 305 of the blade 3 is 10 mm. Therefore, the blade 3 having the transition surface 305 with a curvature radius of 5 to 10 mm has good practical applicability. While reducing the power pulsation at the volute tongue, it will not have a significant impact on the original use effect of the electronic water pump 100.

[0071] According to some embodiments of the present invention, along the circumference of the impeller assembly 10, or in other words, along the rotation direction of the impeller assembly 10, the dimension L of the outer end surface of the blade 3 is ≥ 0.5 mm. In other words, the dimension L of the outer end surface of the blade 3 is neither zero nor too small, and the distance between the upstream side surface 301 of the blade 3 and the downstream side surface 302 of the blade 3 at the outer end of the blade 3 is not too small, which is conducive to ensuring molding accuracy and ensuring the yield rate.

[0072] According to some embodiments of the present invention, at least one of the first end plate 1 and the second end plate 2 is integrally injection-molded with the blade 3 .

[0073] That is, the blades 3 can be integrally injection-molded with the first end plate 1; alternatively, the blades 3 can be integrally injection-molded with the second end plate 2. This improves the connection strength between the blades 3 and the first end plate 1 or the second end plate 2, and makes separation from the blades 3 and the first end plate 1 or the second end plate 2 less likely. Furthermore, the impeller assembly 10 can be assembled with fewer steps, making assembly more convenient.

[0074] like Figures 1 to 5As shown, the electronic water pump 100 according to the embodiment of the present invention includes the impeller assembly 10 according to the above embodiment. Since the electronic water pump 100 according to the embodiment of the present application includes the impeller assembly 10 according to the above embodiment, the electronic water pump 100 according to the embodiment of the present application has at least the following advantages: the upstream side surface 301 of the blade 3 in the set direction F1 and the outer end surface 303 of the blade 3 are smoothly connected by a transition surface 305, and the transition surface 305 is located between the outer end section of the upstream side surface 301 of the blade 3 and the downstream side surface 302 of the blade 3. As a result, the transition surface 305 allows the liquid to enter the volute flow channel relatively smoothly, thereby reducing the impact of the liquid on the volute tongue 60, reducing the pressure pulsation at the volute tongue 60, and improving the NVH performance of the electronic water pump 100 during operation.

[0075] According to some embodiments of this application, you can refer to Figure 1 As shown, the electronic water pump 100 includes a housing 20 and a pump cover 30. The pump cover 30 is mounted on the housing 20 and cooperates with the housing 20 to define a pump chamber 40. The impeller assembly 10 is rotatably positioned within the pump chamber 40. A fluid outlet 50 is provided on the peripheral wall of the pump chamber 40, and a volute 60 is provided at the fluid outlet 50. The direction from one side of the fluid outlet 50 to the other side of the fluid outlet 50 where the volute 60 is provided is a set direction F1.

[0076] When the electronic water pump 100 is in operation, the impeller assembly 10 rotates within the pump chamber 40. Under the action of centrifugal force, liquid is thrown out from the circumferential side of the impeller assembly 10 and enters the fluid outlet 50. A volute tongue 60 is provided at the fluid outlet 50. Typically, the volute tongue 60 is located on one side of the fluid outlet 50 along the set direction F1. The volute tongue 60 is a structure at the intersection of the starting point of the spiral line of the volute flow channel of the pump chamber 40 and the fluid outlet 50. Apart from this, the volute flow channel has no other sharp corners, resulting in large pressure pulsations at the volute tongue 60. After the liquid in the pump chamber 40 passes through the impeller assembly 10, it is divided into a low-pressure area on one side and a high-pressure area on the other side, separated by the volute tongue 60. The high-pressure area is converted into kinetic energy through the fluid outlet 50.

[0077] In some embodiments, the electronic water pump 100 may further include a drive assembly, which includes a stator assembly and a rotor assembly 70. The rotor assembly 70 is used to be connected to the impeller assembly 10. The rotor assembly 70 includes a rotor insulator, which is integrally formed with the impeller assembly 10. In this way, the electronic water pump 100 has better integrity and higher overall strength, greatly reduces the assembly process, and is conducive to increasing production speed.

[0078] An electronic water pump 100 according to a specific embodiment of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the following description is merely illustrative and should not be construed as limiting the present invention.

[0079] like Figures 1 to 3As shown, the electronic water pump 100 according to the first embodiment of the present invention includes a housing 20, a pump cover 30 and an impeller assembly. The pump cover 30 is arranged on the housing 20 and cooperates with the housing 20 to define a pump chamber 40. The impeller assembly 10 is rotatably located in the pump chamber 40. The peripheral wall of the pump chamber 40 is provided with a fluid outlet 50, and a volute 60 is provided at the fluid outlet 50.

[0080] The impeller assembly 10 rotates in a set direction F1 and includes a first end plate 1, a second end plate 2, and a plurality of blades 3 disposed between the first and second end plates 1 and 2. The ends of the blades 3 closest to the rotational axis of the impeller assembly 10 are the inner ends of the blades 3, while the ends of the blades 3 further from the rotational axis of the impeller assembly 10 are the outer ends of the blades 3. A transition surface 305 smoothly connects the upstream side surface 301 of the blade 3 in the set direction F1 to the outer end surface 303 of the blade 3. The transition surface 305 is located between the outer end section of the upstream side surface 301 of the blade 3 and the downstream side surface 302 of the blade 3. The cross-section of the transition surface 305 perpendicular to the rotational axis of the impeller assembly 10 is an arc-shaped arc that convexly extends away from the downstream side surface 302. The distance D between the upstream side surface 301 and the downstream side surface 302 of the blade 3 is 1.1 mm to 2 mm, and the radius of curvature of the transition surface 305 is 5 mm. The outer ends of the blades 3 are coplanar with the outer peripheral surface 101 of the first end plate 1 and the outer peripheral surface 201 of the second end plate 2. The second end plate 2 and the blades 3 are integrally injection-molded.

[0081] like Figure 4 and Figure 5 As shown, the electronic water pump 100 according to the second embodiment of the present invention is different from the electronic water pump 100 of the first embodiment in that the curvature radius of the transition surface is 10 mm, which has a better effect of reducing pressure pulsation.

[0082] like Figure 10 As shown, the thermal management system 1000 according to the embodiment of the present invention includes the electronic water pump 100 according to the embodiment of the present invention. Since the electronic water pump 100 according to the embodiment of the present invention has the above-mentioned beneficial technical effects, according to the thermal management system 1000 according to the embodiment of the present invention, the upstream side surface 301 of the blade 3 in the set direction F1 and the outer end surface 303 of the blade 3 are smoothly connected by a transition surface 305. The transition surface 305 is located between the outer end section of the upstream side surface 301 of the blade 3 and the downstream side surface 302 of the blade 3. As a result, the transition surface 305 allows the liquid to enter the volute flow channel relatively smoothly, thereby reducing the impact of the liquid on the volute tongue 60, reducing the pressure pulsation at the volute tongue 60, and improving the NVH performance of the electronic water pump 100 during operation.

[0083] In some embodiments, the thermal management system 1000 is an important component for regulating the vehicle cabin environment (temperature, humidity, etc.) and the working environment of other components. The thermal management system 1000 mainly includes: valves, heat exchangers, compressors and pumps, such as electronic water pumps 100 or other water pumps. The thermal management system 1000 has a circulating refrigerant, which can be carbon dioxide refrigerant, etc.

[0084] like Figure 9 As shown, a vehicle 2000 according to an embodiment of the present invention includes a thermal management system 1000 according to an embodiment of the present invention. Since the thermal management system 1000 according to an embodiment of the present invention has the aforementioned beneficial technical effects, in the vehicle 2000 according to an embodiment of the present invention, the upstream side surface 301 of the blade 3 in the set direction F1 is smoothly connected to the outer end surface 303 of the blade 3 via a transition surface 305. The transition surface 305 is located between the outer end section of the upstream side surface 301 of the blade 3 and the downstream side surface 302 of the blade 3. Thus, the transition surface 305 allows liquid to enter the volute flow channel relatively smoothly, thereby reducing the impact of the liquid on the volute tongue 60, reducing pressure pulsation at the volute tongue 60, and improving the NVH performance of the electronic water pump 100 during operation.

[0085] Among them, vehicle 2000 can be a new energy vehicle. In some embodiments, the new energy vehicle can be a pure electric vehicle with an electric motor as the main driving force. In other embodiments, the new energy vehicle can also be a hybrid vehicle with an internal combustion engine and an electric motor as the main driving force. Regarding the internal combustion engine and electric motor mentioned in the above embodiments that provide driving power for the new energy vehicle, the internal combustion engine can use gasoline, diesel, hydrogen, etc. as fuel, and the way to provide electrical energy to the electric motor can use power batteries, hydrogen fuel cells, etc., and there is no special limitation here. It should be noted that this is only an exemplary description of the structure of new energy vehicles, etc., and it does not limit the scope of protection of this utility model.

[0086] Other structures and operations of the electronic water pump 100 , the thermal management system 1000 and the vehicle 2000 according to the embodiment of the present invention are well known to those skilled in the art and will not be described in detail here.

[0087] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0088] Throughout this specification, reference to terms such as "embodiment," "specific embodiment," and "example" means that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these 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 any one or more embodiments or examples.

[0089] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and purpose of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. An impeller assembly, characterized in that: The impeller assembly rotates in a set direction, and the impeller assembly comprises: a first end plate and a second end plate; Multiple blades, multiple blades are arranged between the first end plate and the second end plate, the end of the blade close to the rotation axis of the impeller assembly is the inner end of the blade, the end of the blade away from the rotation axis of the impeller assembly is the outer end of the blade, the upstream side surface of the blade in the set direction is smoothly connected to the outer end surface of the blade through a transition surface, and the transition surface is located between the outer end sectional surface of the upstream side surface of the blade and the downstream side surface of the blade.

2. The impeller assembly according to claim 1, characterized in that The cross section of the transition surface perpendicular to the rotation axis of the impeller assembly is arc-shaped, and the arc is convex in a direction away from the downstream side surface.

3. The impeller assembly according to claim 2, characterized in that The arc shape is a circular arc shape.

4. The impeller assembly according to claim 1, wherein: The distance between the upstream side surface of the blade and the downstream side surface of the blade is 1.1 mm to 2 mm, and the curvature radius of the transition surface is ≥5 mm.

5. The impeller assembly according to claim 4, characterized in that The curvature radius of the transition surface is ≤10 mm.

6. The impeller assembly according to claim 4, characterized in that Along the circumference of the impeller assembly, the size of the outer end surface of the blade is ≥0.5 mm.

7. The impeller assembly according to any one of claims 1 to 6, characterized in that: At least one of the first end plate and the second end plate is integrally injection-molded with the blade.

8. An electronic water pump, characterized in that: The invention comprises an impeller assembly according to any one of claims 1 to 7.

9. The electronic water pump according to claim 8, characterized in that: The electronic water pump includes a casing and a pump cover. The pump cover is arranged on the casing and cooperates with the casing to define a pump chamber. The impeller assembly is rotatably located in the pump chamber. The peripheral wall of the pump chamber is provided with a fluid outlet, and a volute is provided at the fluid outlet.

10. A thermal management system, characterized in that: Comprising the electronic water pump according to claim 8 or 9.

11. A vehicle, characterized in that: Comprising the thermal management system of claim 10.

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