Rotor impeller assembly, electric water pump and new energy vehicle

Abstract

This invention belongs to the field of water pump technology, and particularly relates to a rotor impeller assembly, an electronic water pump, and a new energy vehicle. The rotor impeller assembly includes a cylindrical support, a bearing, blades, and a sintered ferrite magnetic ring. A mounting hole is provided along the axial direction of the cylindrical support, and an annular mounting position is provided along the circumference of the cylindrical support. The bearing is disposed within the mounting hole. The blades are mounted at the ends of the cylindrical support. The sintered ferrite magnetic ring is disposed at the mounting position. The cylindrical support integrates the sintered ferrite magnetic ring and the bearing into a single structure through injection molding. This integrated structure has advantages such as small size, simple manufacturing process, and low material cost. Furthermore, the magnetic ring is made of sintered ferrite material, resulting in low material cost while maintaining high reliability.

Description

Technical Field

[0001] This invention belongs to the field of water pump technology, and particularly relates to a rotor impeller assembly, an electronic water pump, and a new energy vehicle. Background Technology

[0002] In existing technologies for automotive electronic water pumps, considering the manufacturability and reliability of rotor components, the rotor permanent magnet is generally made of plastic magnet or sintered rare earth permanent magnet material. Using a plastic magnet ring for integrated plastic coating eliminates the risk of rust and provides good reliability. However, the magnetic properties of plastic magnet materials are relatively low, requiring an increase in the size of the motor to meet performance requirements. Using sintered rare earth permanent magnet materials is expensive, requiring an additional rotor core to install the permanent magnet and conduct magnetic flux. Furthermore, water-proof components need to be placed around the outer ring of the rotor core to prevent the rotor core and permanent magnet from rusting when immersed in water. These water-proof components increase the air gap in the motor, reducing motor performance. Summary of the Invention

[0003] The purpose of this invention is to provide a rotor impeller assembly, an electronic water pump, and a new energy vehicle, aiming to solve the technical problems of low magnetic performance of plastic magnetic rings and high cost of sintered rare earth permanent magnet materials in the prior art.

[0004] To achieve the above objectives, an embodiment of the present invention provides a rotor impeller assembly, including a cylindrical support, bearings, blades, and a sintered ferrite magnetic ring;

[0005] The cylindrical bracket has mounting holes along its axial direction and annular mounting positions along its circumference.

[0006] The bearing is disposed within the mounting hole;

[0007] The blade is mounted at the end of the cylindrical support;

[0008] The sintered ferrite magnetic ring is disposed at the mounting position, and the axial length of the sintered ferrite magnetic ring is defined as L1. The bearing and the sintered ferrite magnetic ring have an intersecting portion in their axial direction, and this intersecting portion is defined as L2. The distance between the bearing and the blade is L3. Furthermore, the relationship between L1, L2 and L3 satisfies L1 / 4≤L2≤L1 / 5, and L2≤3.0mm.

[0009] Preferably, the cylindrical support integrates the sintered ferrite magnetic ring and the bearing into a single structure through injection molding.

[0010] Preferably, the sintered ferrite magnetic ring has N magnetic poles, and both sides of the sintered ferrite magnetic ring are provided with reinforcing holes that match the number of magnetic poles; the cylindrical support is provided with reinforcing columns that correspond one-to-one with each of the reinforcing holes.

[0011] Preferably, the depth of the reinforcing hole is defined as H, and the depth H of the reinforcing hole satisfies 0.2mm≤H≤L1 / L3 with respect to the axial length L1 of the sintered ferrite magnetic ring and the distance L3 between the rotating shaft and the blade.

[0012] Preferably, the reinforcing column fills the reinforcing hole completely.

[0013] Preferably, the reinforcing holes corresponding to the magnetic poles are all located at the middle position of the magnetic poles.

[0014] Preferably, the cylindrical support includes a body, one end of which has a first end plate extending radially, and the side of which has a second end plate extending radially. An annular groove-shaped mounting position is formed between the first end plate and the second end plate. Each reinforcing column is circumferentially arranged on the side opposite to the first end plate and the second end plate of the cylindrical support. The diameter D of the first end plate and the second end plate is the same, and the diameter D of the sintered ferrite magnetic ring is smaller than the diameter D of the first end plate and the second end plate.

[0015] Preferably, the cylindrical support is further provided with a flow guide groove, which is circumferentially arranged around the mounting position along the cylindrical support. The opening of each flow guide groove faces the inner circular surface of the sintered ferrite magnetic ring, and a flow guide hole is formed between the inner circular surface of the sintered ferrite magnetic ring and the flow guide groove. One end of the flow guide groove penetrates through the first end plate.

[0016] The rotor impeller assembly provided in this invention has at least one of the following technical effects: The sintered ferrite magnetic ring and bearing are integrally molded using injection molding, resulting in a small structural size, simple manufacturing process, and low material cost. Furthermore, the magnetic ring is made of sintered ferrite material, which reduces material cost while ensuring high reliability. By using a sintered ferrite magnetic ring, this invention effectively reduces the motor air gap, stator lamination thickness, and magnetic ring thickness, while still significantly improving motor efficiency. It also reduces the material cost of the stator and rotor. Furthermore, the stator laminations do not exhibit magnetic saturation after using the sintered ferrite magnetic ring; instead, motor performance is improved. When the bearing's axial position satisfies the above-mentioned relationship, its stress state is optimal, with relatively low stress at both ends of the bearing inner ring and uniform stress distribution in other parts. This effectively improves the wear of the sliding bearing and increases its service life and reliability.

[0017] The present invention also provides an electronic water pump, including the above-described rotor impeller assembly.

[0018] The above-mentioned technical solutions of one or more in the electronic water pump provided by the embodiments of the present invention have at least one of the following technical effects: Due to the adoption of the above-mentioned rotor impeller assembly, the sintered ferrite magnetic ring and bearing are integrated into a single structure through injection molding, resulting in small structural size, simple manufacturing process, and low material cost. Furthermore, the magnetic ring is made of sintered ferrite material, which reduces material cost while ensuring high reliability. After adopting the sintered ferrite magnetic ring, the present invention effectively reduces the motor air gap, stator lamination thickness, and magnetic ring thickness, while still significantly improving motor efficiency. It reduces the material cost of the stator and rotor. Moreover, after adopting the sintered ferrite magnetic ring, the stator laminations do not exhibit magnetic circuit saturation; instead, the motor performance is improved to some extent. When the bearing's axial position satisfies the above relationship, its stress state is optimal, with relatively small stress at both ends of the bearing inner ring and uniform stress distribution in other parts. This effectively improves the wear of the sliding bearing and increases its service life and reliability.

[0019] The present invention also provides a new energy vehicle, which includes the above-mentioned electronic water pump.

[0020] The above-mentioned technical solutions of one or more in the electronic water pump provided by the embodiments of the present invention have at least one of the following technical effects: Due to the adoption of the above-mentioned electronic water pump, the sintered ferrite magnetic ring and the bearing are integrated into a single structure through injection molding, resulting in small structural size, simple manufacturing process, and low material cost. Furthermore, the magnetic ring is made of sintered ferrite material, which reduces material cost while providing high reliability. After adopting the sintered ferrite magnetic ring, the present invention effectively reduces the motor air gap, stator lamination thickness, and magnetic ring thickness, while still significantly improving motor efficiency. It reduces the material cost of the stator and rotor. Moreover, after adopting the sintered ferrite magnetic ring, the stator laminations do not exhibit magnetic circuit saturation; instead, the motor performance is improved to some extent. When the bearing's axial position satisfies the above relationship, its stress state is optimal, with relatively small stress at both ends of the bearing inner ring and uniform stress distribution in other parts. This effectively improves the wear of the sliding bearing and increases its service life and reliability. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the rotor impeller assembly provided in an embodiment of the present invention.

[0023] Figure 2 This is a schematic diagram of the sintered ferrite magnetic ring in the rotor impeller assembly provided in an embodiment of the present invention.

[0024] Figure 3 For along Figure 2 Sectional view along line AA in the middle.

[0025] Figure 4 for Figure 1 A sectional view of the provided rotor impeller assembly.

[0026] Figure 5 for Figure 4 Sectional view along the middle BB line.

[0027] Figure 6 for Figure 4 Enlarged view of point C in the middle.

[0028] Figure 7 This is a schematic diagram of the cylindrical support structure in the rotor impeller assembly provided in an embodiment of the present invention.

[0029] Figure 8 This is a table comparing the efficiency and structural dimensions of electronic water pumps made of different materials used in this invention.

[0030] Figure 9 The simulation results of the sintered ferrite magnetic ring designed for this invention are shown in the cloud diagram.

[0031] Figure 10 A schematic diagram of the structure of an electronic water pump provided in an embodiment of the present invention.

[0032] The following are the labeling elements in the figure:

[0033] 10—Rotor impeller assembly; 11—Cylindrical support; 111—Mounting hole

[0034] 112—Installation position; 113—Blade; 114—Reinforcing column

[0035] 115—Body; 116—First end plate; 117—Second end plate

[0036] 118—Guide channel; 12—Bearing; 13—Impeller cover

[0037] 14—Sintered ferrite magnetic ring; 141—Reinforcing hole; 20—Shell

[0038] 30—Stator assembly; 40—Electrical control board assembly; 50—Pump cover

[0039] 60—Rear End Cover Detailed Implementation

[0040] Embodiments of the present invention are described in detail below, examples of which are illustrated 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 intended to explain embodiments of the present invention, and should not be construed as limiting the present invention.

[0041] In the description of the embodiments of the present invention, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of 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, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0042] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of the present invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0043] In the embodiments of the present invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention according to the specific circumstances.

[0044] In one embodiment of the present invention, such as Figures 1-9 As shown, a rotor impeller assembly 10 is provided, including a cylindrical support 11, a bearing 12, an impeller cover 13, and a sintered ferrite magnetic ring 14;

[0045] The cylindrical support 11 has an axial mounting hole 111 and an annular mounting position 112 along the circumference of the cylindrical support 11. One end of the cylindrical support 11 has a blade 113.

[0046] The bearing 12 is disposed in the mounting hole 111, and its axis coincides with the axis of the cylindrical bracket 11.

[0047] The impeller cover 13 is fixedly connected to the end of the cylindrical support 11 and covers the blade 113.

[0048] The sintered ferrite magnetic ring 14 is disposed on the mounting position 112, and the cylindrical bracket 11 is formed by injection molding to encapsulate the sintered ferrite magnetic ring 14 and the bearing 12 into an integral structure.

[0049] Furthermore, the injection molding material is a resin-based material. Specifically, using a resin-based material can ensure the stability and service life of the cylindrical support 11 after molding, and can also ensure production costs.

[0050] Specifically, the sintered ferrite magnetic ring 14 and the bearing 12 are integrated into a single structure by injection molding, which has the advantages of small structural size, simple manufacturing process and low material cost; furthermore, the magnetic ring is made of sintered ferrite material, which makes the material cost low and has the advantages of high reliability.

[0051] Furthermore, such as Figure 8 As shown, this invention, by employing a sintered ferrite magnetic ring 14, effectively reduces the motor air gap, stator stack thickness, and magnetic ring thickness, while still significantly improving motor efficiency and reducing the material costs of the stator and rotor. Furthermore, as... Figure 9 As shown, Figure 9 The electromagnetic performance simulation diagram of the present invention shows that after using the sintered ferrite magnetic ring 14, the stator laminations still do not show magnetic circuit saturation, but the motor performance is improved to a certain extent.

[0052] In another embodiment of the invention, such as Figure 4 As shown, the axial length of the sintered ferrite magnetic ring 14 is defined as L1. The bearing 12 and the sintered ferrite magnetic ring 14 have an intersecting portion in their axial direction, which is defined as L2 for ease of explanation. The distance between the bearing 12 and the blade 113 is defined as L3. Furthermore, the relationship between L1, L2, and L3 satisfies L1 / 4 ≤ L2 ≤ L1 / 5, and L2 ≤ 3.0 mm. Specifically, when the bearing 12 satisfies the above relationship in its axial position, its stress state is optimal. The stress at both ends of the inner ring of the bearing 12 is relatively small, while the stress distribution in other parts is uniform, which can effectively improve the wear of the sliding bearing 12 and increase its service life and reliability.

[0053] In another embodiment of the present invention, the sintered ferrite magnetic ring 14 has N magnetic poles, and both sides of the sintered ferrite magnetic ring 14 are provided with reinforcing holes 141 adapted to the number of magnetic poles. That is, the number of reinforcing holes 141 on each side is N. It should be noted that N represents a quantity, and this quantity is an integer. This quantity can be one or more, and is not limited here. Further, the axis of each reinforcing hole 141 is parallel to the axis of the sintered ferrite magnetic ring 14; the cylindrical support 11 is provided with reinforcing columns 114 corresponding one-to-one with each reinforcing hole 141, and the reinforcing columns 114 fill the reinforcing holes 141. Specifically, the provided reinforcing holes 141 and reinforcing columns 114 cooperate with each other, and the reinforcing columns 114 fill the reinforcing holes 141, which can prevent the sintered ferrite magnetic ring 14 from radially falling off, avoid the rotor from jamming and prevent rotation, and ensure the normal operation of the electronic water pump.

[0054] In another embodiment of the invention, such as Figures 1-4 As shown, the reinforcing holes 141 corresponding to the magnetic poles are all located at the center of the magnetic poles. Further, the interface of each reinforcing hole 141 can be of any shape, including but not limited to circular, elliptical, polygonal, and other irregular shapes. The depth of the reinforcing hole 141 is defined as H, and the depth H of the reinforcing hole 141, the axial length L1 of the sintered ferrite magnetic ring 14, and the distance L3 between the rotating shaft and the blade 113 satisfy 0.2mm ≤ H ≤ L1 / L3. Only when the above relationship is satisfied can the reinforcing effect of the reinforcing holes 141 be achieved without affecting the performance of the sintered ferrite magnetic ring 14; otherwise, if the above relationship is not satisfied, the electromagnetic performance will be reduced or there will be no fixing effect.

[0055] In another embodiment of the invention, such as Figure 1 , Figure 4 and Figure 7As shown, the cylindrical support 11 includes a body 115. A first end plate 116 extends radially from one end of the body 115, and a second end plate 117 extends radially from the side of the body 115. An annular groove-shaped mounting position 112 is formed between the first end plate 116 and the second end plate 117. That is, the sintered ferrite magnetic ring 14 is disposed between the first end plate 116 and the second end plate 117. Each reinforcing column 114 is circumferentially arranged on the side of the cylindrical support 11 opposite to the first end plate 116 and the second end plate 117. Further, the first end plate... The diameter D2 of the first end plate 116 and the second end plate 117 is the same, and the diameter D1 of the sintered ferrite magnetic ring 14 is smaller than the diameter D2 of the first end plate 116 and the second end plate 117. Specifically, since the present invention uses injection molding process to encapsulate the sintered ferrite magnetic ring 14 and the bearing 12 into an integral structure, when the diameter D1 of the sintered ferrite magnetic ring 14 is smaller than the diameter D2 of the first end plate 116 and the second end plate 117, it can be ensured that there is no injection molding material on the outer surface of the sintered ferrite magnetic ring 14, thereby reducing the air gap requirements between the stator and rotor, so as to improve the performance efficiency of the motor.

[0056] In another embodiment of the invention, such as Figures 1-7 As shown, the cylindrical support 11 is also provided with a flow guide groove 118. The flow guide groove 118 is circumferentially arranged on the mounting position 112 along the cylindrical support 11. The opening of each flow guide groove 118 faces the inner circular surface of the sintered ferrite magnetic ring 14. That is, when the sintered ferrite magnetic ring 14 is set in the mounting position 112, a flow guide hole is formed between the inner circular surface of the sintered ferrite magnetic ring 14 and the flow guide groove 118. One end of the flow guide groove 118 penetrates the first end plate 116. Specifically, the flow guide groove 118 in a limited space can improve the fluidity of the medium and increase the heat dissipation performance of the motor. In addition, the flow guide groove 118 can also increase the size of the forming flow guide pin of the injection mold and improve the mold life.

[0057] Please see Figure 10 The present invention also provides an electronic water pump, which includes the rotor impeller assembly 10 described above.

[0058] Specifically, by employing the aforementioned rotor impeller assembly 10, the sintered ferrite magnetic ring 14 and bearing 12 are integrally molded using an injection molding process, resulting in a small structural size, simple manufacturing process, and low material cost. Furthermore, the magnetic ring is made of sintered ferrite material, which further reduces material cost while ensuring high reliability. This effectively reduces the motor air gap, stator lamination thickness, and magnetic ring thickness, while still significantly improving motor efficiency. It lowers the material costs of the stator and rotor. Even after adopting the sintered ferrite magnetic ring 14, the stator laminations do not exhibit magnetic circuit saturation; on the contrary, the motor performance is improved to some extent.

[0059] In another embodiment of the present invention, the electronic water pump further includes a housing 20, a stator assembly 30 and an electronic control board assembly 40 installed in the housing 20, and a pump cover 50 and a rear end cover 60 connected to both ends of the housing 20.

[0060] The stator assembly 30 is fixedly installed in the housing 20; the rotor impeller assembly 10 is rotatably installed in the housing 20; the electronic control board assembly 40 is electrically connected to the stator assembly 30; a cavity is formed between the pump cover 50 and the housing 20; the pump cover 50 includes an inlet and an outlet communicating with the cavity; the blade 113 is located in the cavity.

[0061] Specifically, during operation, the electronic control board assembly 40 supplies power to the stator assembly 30. The stator assembly 30 cooperates with the rotor impeller assembly 10. The rotor impeller assembly 10 rotates, and the blades 113 located in the cavity rotate, causing negative pressure to be generated at the inlet. Liquid enters from the inlet and exits from the outlet.

[0062] The present invention also provides a new energy vehicle, which includes the above-mentioned electronic water pump.

[0063] Specifically, by employing the aforementioned electronic water pump, the sintered ferrite magnetic ring 14 and bearing 12 are integrated into a single structure through injection molding, resulting in a small structural size, simple manufacturing process, and low material cost. Furthermore, the magnetic ring is made of sintered ferrite material, which further reduces material cost while ensuring high reliability. This effectively reduces the motor air gap, stator lamination thickness, and magnetic ring thickness, while still significantly improving motor efficiency. It also lowers the material costs of the stator and rotor. Even after adopting the sintered ferrite magnetic ring 14, the stator laminations do not exhibit magnetic circuit saturation; on the contrary, the motor performance is improved to some extent.

[0064] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A rotor impeller assembly (10), characterized in that, include: A cylindrical support (11) is provided with a mounting hole (111) along its axial direction and an annular mounting position (112) along its circumference. One end of the cylindrical support (11) is provided with a blade (113). A bearing (12) is disposed in the mounting hole (111) and its axis coincides with the axis of the cylindrical support (11); Impeller cover (13), which is fixedly connected to the end of the cylindrical support (11) and covers the blade (113); A sintered ferrite magnetic ring (14) is disposed on the mounting position (112). The axial length of the sintered ferrite magnetic ring (14) is defined as L1. The bearing (12) and the sintered ferrite magnetic ring (14) have an intersecting part in their axial direction, which is defined as L2. The distance between the bearing (12) and the blade (113) is L3. Furthermore, the relationship between L1 and L2 satisfies L1 / 5≤L2≤L1 / 4, and L2≤3.0mm. The cylindrical support (11) integrates the sintered ferrite magnetic ring (14) and the bearing (12) into a single structure through injection molding. The sintered ferrite magnetic ring (14) has N magnetic poles, and both sides of the sintered ferrite magnetic ring (14) are provided with reinforcing holes (141) that match the number of magnetic poles; the cylindrical support (11) is provided with reinforcing columns (114) that correspond one-to-one with each of the reinforcing holes (141). The cylindrical support (11) includes a body (115), one end of which has a first end plate (116) extending radially, and the side of which has a second end plate (117) extending radially. An annular groove-shaped mounting position (112) is formed between the first end plate (116) and the second end plate (117). Each reinforcing column (114) is circumferentially arranged on the side opposite to the first end plate (116) and the second end plate (117) of the cylindrical support (11). The diameter D2 of the first end plate (116) and the second end plate (117) is the same. The diameter D1 of the sintered ferrite magnetic ring (14) is smaller than the diameter D2 of the first end plate (116) and the second end plate (117). The cylindrical support (11) is also provided with a flow guide groove (118), which is arranged circumferentially around the cylindrical support (11) on the mounting position (112). The opening of each flow guide groove (118) faces the inner circular surface of the sintered ferrite magnetic ring (14), and a flow guide hole is formed between the inner circular surface of the sintered ferrite magnetic ring (14) and the flow guide groove (118). One end of the flow guide groove (118) penetrates the first end plate (116).

2. The rotor impeller assembly (10) according to claim 1, characterized in that, The depth of the reinforcing hole (141) is defined as H. The depth H of the reinforcing hole (141) satisfies 0.2mm≤H≤L1 / L3 with respect to the axial length L1 of the sintered ferrite magnetic ring (14) and the distance L3 between the bearing and the blade (113).

3. The rotor impeller assembly (10) according to claim 1, characterized in that, The reinforcing column (114) fills the reinforcing hole (141).

4. The rotor impeller assembly (10) according to claim 1, characterized in that, The reinforcing holes (141) corresponding to the magnetic poles are all located in the middle of the magnetic poles.

5. An electronic water pump, characterized in that, It includes the rotor impeller assembly (10) as described in any one of claims 1 to 4.

6. A new energy vehicle, characterized in that, Includes the electronic water pump as described in claim 5.

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