Rotor assembly and electronic water pump

Abstract

The utility model relates to the technical field of electronic water pumps, in particular to a rotor assembly and an electronic water pump. The rotor assembly comprises an impeller seat and a magnetic ring assembly. The impeller seat is provided with a first cavity; the magnetic ring assembly is arranged in the first cavity; the impeller seat is provided with a communicating part, the magnetic ring assembly communicates with the outside of the first cavity through the communicating part, and the communicating part is opposite to the axial end face of the magnetic ring assembly. The rotor assembly is simple in structure, convenient to process and low in processing cost.

Description

Technical Field

[0001] This application relates to the field of electronic water pumps, and more specifically, to a rotor assembly and an electronic water pump. Background Technology

[0002] An electric water pump is a type of water pump that uses an electronic control unit to regulate the motor speed to precisely control the flow of coolant. It is widely used in automotive engine cooling systems, especially in the field of new energy vehicles. The rotor assembly is the core component of the electric water pump. When the pump is working, the rotor assembly rotates, converting its mechanical energy into the kinetic energy of the fluid.

[0003] In related technologies, the rotor assembly includes a magnetic ring assembly, which is generally enclosed within the impeller seat to ensure that the magnetic ring assembly is isolated from liquids such as antifreeze.

[0004] However, this assembly method is complex and wasteful of materials, making it difficult to control the production cost of rotor components. Utility Model Content

[0005] A primary objective of this application is to overcome at least one of the deficiencies of the prior art described above and to provide a rotor assembly with low production costs.

[0006] Another main objective of this application is to overcome at least one of the defects of the prior art and to provide an electronic water pump with a long service life and high assembly efficiency.

[0007] To achieve the above-mentioned objectives, this application adopts the following technical solution:

[0008] This application provides a rotor assembly, including:

[0009] The impeller seat has a first chamber;

[0010] The magnetic ring assembly is disposed within the first cavity;

[0011] The impeller seat is provided with a connecting portion to allow the magnetic ring assembly to communicate with the outside of the first chamber; the connecting portion is opposite to the axial end face of the magnetic ring assembly.

[0012] According to some embodiments of this application, the impeller seat includes a cylindrical body and an impeller portion disposed on the circumferential outer side of the cylindrical body; a portion of the cylindrical body is used to fix the impeller portion, and another portion of the cylindrical body forms a first chamber.

[0013] According to some embodiments of this application, the cylindrical body includes a first cylindrical section, a transition plate, and a second cylindrical section;

[0014] The impeller portion is located on the circumferential outer side of the first cylindrical section;

[0015] The inner diameter of the second cylindrical section is larger than the inner diameter of the first cylindrical section. The transition plate connects the first cylindrical section and the second cylindrical section, and the transition plate and the second cylindrical section form the first cavity.

[0016] The open end of the second cylindrical section forms the connecting portion.

[0017] According to some embodiments of this application, the cylindrical body includes a first cylindrical section, a transition plate, a second cylindrical section, and an end plate;

[0018] The impeller portion is located on the circumferential outer side of the first cylindrical section;

[0019] The inner diameter of the second cylindrical section is larger than that of the first cylindrical section. The transition plate connects the first cylindrical section and the second cylindrical section. The end plate is connected to the end of the second cylindrical section away from the transition plate. The transition plate and the second cylindrical section form the first cavity.

[0020] The connecting portion is disposed on the end plate.

[0021] According to some embodiments of this application, the magnetic ring assembly includes a magnet, and the communicating portion includes a mounting hole facing the magnet for mounting the magnet.

[0022] According to some embodiments of this application, the magnetic ring assembly includes an iron core and a magnet, the magnet being magnetically connected to the iron core, and the magnet being located between the iron core and the inner wall of the first chamber;

[0023] Alternatively, the magnet is magnetically attached to the inner wall of the iron core.

[0024] According to some embodiments of this application, the iron core is provided with a first magnetizing hole;

[0025] The connecting portion further includes a second magnetizing hole disposed on the end plate, the second magnetizing hole being connected to the first magnetizing hole.

[0026] According to some embodiments of this application, the diameter of the second magnetizing hole is larger than the diameter of the first magnetizing hole.

[0027] According to some embodiments of this application, the end plate includes a ring plate and a plurality of connecting portions disposed on the circumferential edge of the ring plate, and the ring plate is connected to the second cylindrical section through the connecting portions.

[0028] According to some embodiments of this application, the magnets include a plurality of magnets, and the plurality of magnets are uniformly disposed on the circumferential outer wall of the iron core;

[0029] The inner wall of the second cylindrical section is also provided with a plurality of partition ribs, and the partition ribs are provided between two adjacent magnetic steel sheets.

[0030] According to some embodiments of this application, the end plate includes a ring plate and a plurality of connecting portions disposed on the circumferential edge of the ring plate, and the ring plate is connected to the partition rib and / or the second cylindrical section through the connecting portions.

[0031] According to some embodiments of this application, the rotor assembly further includes a bearing assembly having a shaft hole for fitting the bearing assembly onto a rotating shaft; a portion of the impeller seat is fitted onto the bearing assembly, and a portion of the impeller seat and the bearing assembly form the first chamber.

[0032] According to some embodiments of this application, the end plate has a first end face facing the magnetic ring assembly and a second end face facing away from the magnetic ring assembly; the bearing assembly has a third end face close to the end plate;

[0033] The third end face is flush with the second end face;

[0034] Alternatively, the third end face protrudes beyond the second end face.

[0035] According to some embodiments of this application, the bearing assembly includes a first bearing, a third bearing, and a second bearing connected in sequence, wherein the inner holes of the first bearing, the third bearing, and the second bearing together form the shaft hole; and / or

[0036] The rotor assembly also includes an impeller cover, which is connected to the impeller seat.

[0037] According to some embodiments of this application, the impeller seat is an integrally injection-molded structure.

[0038] According to another aspect of this application, an electronic water pump is also provided, comprising:

[0039] The shell has a second chamber;

[0040] A rotating shaft is rotatably disposed in the second chamber;

[0041] A rotor assembly is sleeved on the rotating shaft and can rotate synchronously with the rotating shaft; the rotor assembly is the rotor assembly described above.

[0042] According to some embodiments of this application, the housing includes a pump head and a pump casing, the pump head and the pump casing forming a second chamber;

[0043] The electronic water pump also includes a gasket sandwiched between the pump head and the rotor assembly.

[0044] According to some embodiments of this application, the pump head includes a cover and a mounting portion connected to the cover, the cover covering the housing, and the gasket sandwiched between the mounting portion and the rotor assembly;

[0045] An anti-rotation structure is provided between the mounting part and the gasket to prevent rotation of the mounting part and the gasket.

[0046] According to some embodiments of this application, the anti-rotation structure includes a protrusion and a groove that mates with the insertion, the protrusion being disposed in one of the mounting portion and the gasket, and the groove being disposed in the other of the mounting portion and the gasket.

[0047] An embodiment of the above application has at least the following advantages or beneficial effects:

[0048] 1. The rotor assembly of this application includes an impeller housing and a magnetic ring assembly. The impeller housing has a first chamber, and the magnetic ring assembly is disposed within the first chamber. Because the impeller housing has a connecting portion, the magnetic ring assembly can communicate with the outside of the first chamber through the connecting portion. The impeller housing does not completely enclose the magnetic ring assembly, simplifying the structure of the impeller housing. During the processing of the impeller housing, it is unnecessary to first form an injection-molded body or protective cover to enclose the magnetic ring assembly. Because the impeller housing has a connecting portion, it can save more raw materials, thereby helping to reduce the processing cost of the rotor assembly.

[0049] 2. This application also provides an electronic water pump. Since the electronic water pump uses the above-mentioned rotor assembly, it also has the advantages of long service life and high assembly efficiency. Attached Figure Description

[0050] The various objectives, features, and advantages of this application will become more apparent from the following detailed description of preferred embodiments in conjunction with the accompanying drawings. The drawings are merely illustrative illustrations of this application and are not necessarily drawn to scale. In the drawings, the same reference numerals always denote the same or similar parts.

[0051] Figure 1 This is a cross-sectional view showing an exemplary embodiment of the electronic water pump according to this application;

[0052] Figure 2 yes Figure 1 The diagram shows the structure of the pump head in the electronic water pump.

[0053] Figure 3 yes Figure 2 The enlarged view of section A mainly shows the structure of the mounting part;

[0054] Figure 4 The diagram shows the structure of the gasket in the electronic water pump.

[0055] Figure 5 This is a three-dimensional structural schematic diagram showing an exemplary embodiment of the rotor assembly according to this application;

[0056] Figure 6 yes Figure 5 Exploded view of the intermediate rotor assembly;

[0057] Figure 7 yes Figure 5 Bottom view of the central rotor assembly;

[0058] Figure 8 yes Figure 7 A cross-sectional view of the central rotor assembly along the BB plane;

[0059] Figure 9 yes Figure 7 A cross-sectional view of the central rotor assembly along the CC plane;

[0060] Figure 10 yes Figure 7 Main view of the rotor assembly;

[0061] Figure 11 yes Figure 10 A cross-sectional view of the central rotor assembly along the DD plane;

[0062] Figure 12 This is a schematic flowchart illustrating an exemplary embodiment of the manufacturing process of the rotor assembly according to this application.

[0063] The annotations in the attached figures are explained as follows:

[0064] 10. Rotor assembly; 20. Electric water pump;

[0065] 100, Bearing assembly; 101, Shaft hole; 110, First bearing; 120, Third bearing; 130, Second bearing; 130a, Third end face; 200, Rotating shaft; 201, First chamber; 300, Impeller assembly; 400, Impeller seat; 410, Cylinder body; 411, First cylindrical section; 412, Transition plate; 414, Second cylindrical section; 415, End plate; 415a, First end face; 415b, Second end face; 4151, Ring plate; 4152, Connecting part; 416. Connecting part; 417. Mounting hole; 418. Second magnetizing hole; 419. Separating rib; 420. Impeller part; 500. Impeller cover; 600. Magnetic ring assembly; 610. Iron core; 611. First magnetizing hole; 620. Magnet; 700. Housing; 701. Second chamber; 702. Third chamber; 710. Pump head; 711. Cover; 712. Mounting part; 7121. Protrusion; 720. Pump casing; 800. Gasket; 810. Groove; 900. Embedded part;

[0066] L, the axis of rotation;

[0067] D1, Axial direction of the rotating shaft; D2, Radial direction of the rotating shaft. Detailed Implementation

[0068] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, they are provided so that this application will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore their detailed description will be omitted.

[0069] The features, structures, or characteristics described below can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the following description to give a full understanding of embodiments of this application. However, those skilled in the art will recognize that the technical solutions of this application can be practiced without one or more of the specific details described, or other methods, components, materials, etc., can be employed. In other instances, well-known structures, materials, or operations are not shown or described in detail to avoid obscuring various aspects of this application.

[0070] like Figure 1 As shown, this application embodiment provides an electronic water pump 20, which includes: a housing 700, a rotating shaft 200, and a rotor assembly 10.

[0071] Specifically, the housing 700 includes a pump head 710, a pump casing 720, and a rotating shaft 200. The pump head 710 and the pump casing 720 can form a second chamber 701 and a third chamber 702. The second chamber 701 is located inside the third chamber 702 and is used to accommodate the rotating shaft 200, the rotor assembly 10, and antifreeze; the second chamber 701 is a sealed "wet chamber." The third chamber 702 is used to accommodate structures such as circuit boards and stator assemblies; the third chamber 702 is a "dry chamber."

[0072] The rotor assembly 10 is mounted on the rotating shaft 200. The rotor assembly 10 can rotate synchronously with the rotating shaft 200. When the electric water pump 20 is working, the rotating shaft 200 rotates, driving the rotor assembly 10 to rotate synchronously. The impeller assembly of the rotor assembly 10 rotates, thereby converting mechanical energy into the kinetic energy of the fluid.

[0073] Continue to refer to Figure 1 The electric water pump 20 also includes a gasket 800, which is sandwiched between the pump head 710 and the rotor assembly 10. The gasket 800 can prevent the rotor assembly 10 from directly rubbing against the pump head 710, thus affecting the service life of the pump head 710.

[0074] The material of the 800 gasket can be wear-resistant materials such as stainless steel, graphite, zirconium oxide, and alumina.

[0075] like Figures 2 to 4 As shown, in some embodiments, the pump head 710 includes a cover 711 and a mounting portion 712 connected to the cover 711. The cover 711 covers the housing 700, and the gasket 800 is sandwiched between the mounting portion 712 and the rotor assembly 10.

[0076] An anti-rotation structure is provided between the mounting part 712 and the gasket 800 to prevent the mounting part 712 from rotating and the gasket 800 from rotating. The anti-rotation structure can prevent the gasket 800 from rotating at high speed during the rotation of the rotor assembly 10, reducing the risk of the gasket 800 moving or misaligning.

[0077] Specifically, such as Figure 3 and Figure 4 As shown, the anti-rotation structure may include a protrusion 7121 and a groove 810 that engages with the protrusion 7121. The protrusion 7121 may be provided in one of the mounting portion 712 and the gasket 800, and the groove 810 may be provided in the other of the mounting portion 712 and the gasket 800.

[0078] Continue to refer to Figure 3 and Figure 4 In some embodiments, a protrusion 7121 may be provided on the mounting portion 712. The protrusion 7121 protrudes from the surface of the mounting portion 712 towards the side where the rotor assembly 10 is located. The gasket 800 is provided with a groove 810 that engages with the protrusion 7121. When the rotor assembly 10 rotates, the gasket 800 tends to rotate with the rotor assembly 10. The engagement of the protrusion 7121 and the groove 810 can prevent the gasket 800 from rotating, reducing the risk of the gasket 800 shifting or becoming misaligned.

[0079] In other embodiments, the protrusion may also be provided on the gasket, and the groove may be provided on the mounting portion 712.

[0080] The embodiments of the rotor assembly of this application are described below with reference to the accompanying drawings.

[0081] like Figure 5 and Figure 6 As shown, the rotor assembly 10 in this embodiment includes an impeller seat 400 and a magnetic ring assembly 600.

[0082] The impeller housing 400 has a first chamber 201 and a magnetic ring assembly 600 disposed within the first chamber 201.

[0083] like Figure 5 and Figure 7As shown, the impeller holder 400 has a connecting portion 416, through which the magnetic ring assembly 600 can communicate with the outside of the first chamber 201. This eliminates the need for the impeller holder 400 to completely enclose the magnetic ring assembly 600, simplifying its structure and making its manufacturing process easier. Furthermore, the connecting portion 416 reduces the material required for the impeller holder 400, thus lowering its production cost.

[0084] Furthermore, the connecting portion 416 can be axially ( Figure 5 The end faces (in the D1 direction) are opposite. "Opposite" means that the axial end face of the magnetic ring assembly 600 can be seen through the connecting part 416, so as to facilitate the assembly of the magnetic ring assembly 600 or the magnetization of the magnetic ring assembly 600 through the connecting part 416.

[0085] Furthermore, the impeller seat 400 can be manufactured using injection molding. In related technologies, the impeller seat requires at least two processing steps to form the rotor assembly. For example, first, the magnetic ring assembly is injection molded as an insert to obtain an injection-molded body including the impeller seat and the magnetic ring assembly. Then, the injection-molded body is injection molded a second time as an insert to obtain an impeller seat including the first injection-molded body, a bushing, and an impeller portion. Finally, the impeller cover is fixed to the impeller seat to obtain the rotor assembly. Alternatively, a metal protective cover is first connected to the outside of the magnetic ring assembly, enclosing the magnetic ring assembly to form an insert. Then, a bushing, impeller portion, etc., are injection molded outside the insert to form the impeller seat. Finally, the impeller cover is fixed to the impeller seat to obtain the rotor assembly.

[0086] The inventors discovered that the first processing step described above is to ensure the encapsulation of the magnetic ring assembly, thereby isolating it from liquids such as antifreeze and ensuring its service life. The second injection molding step is to form the impeller seat and connect multiple components. However, multiple processing steps can affect the coaxiality of the rotor assembly, which in turn affects the dynamic balance accuracy of the rotor assembly, leading to a reduced service life and noise generation. Furthermore, the high precision requirements of multiple processing steps reduce the processing efficiency of the rotor assembly and increase production costs.

[0087] Based on this, the inventors further demonstrated the impact of liquids such as antifreeze on the lifespan of the magnetic ring assembly, and found that liquids such as antifreeze do not corrode the magnetic ring assembly, so they have little impact on the lifespan of the magnetic ring assembly.

[0088] Based on the above concept, this application proposes a structure in which the magnetic ring assembly and the impeller seat are directly connected to the outside. Therefore, when processing the impeller seat 400, it is not necessary to first form an injection molded body or protective cover to wrap the magnetic ring assembly 600. The impeller seat 400 can be directly injection molded on the outside of the iron core in one step.

[0089] Because the impeller housing 400 can be injection molded in one piece, the coaxiality and dynamic balance of the rotor assembly 10 are effectively guaranteed, which helps to improve the service life of the rotor assembly 10 and reduce the noise generated during rotation. At the same time, it also helps to improve the processing efficiency of the rotor assembly and reduce processing costs.

[0090] Furthermore, such as Figure 8 and Figure 9 As shown, the magnetic ring assembly 600 includes an iron core 610 and a magnet 620, with the magnet 620 magnetically connected to the iron core. Exemplarily, the iron core 610 may be interference-fitted to the bearing assembly 100, and the magnet 620 is located between the iron core and the inner wall of the first chamber 201.

[0091] It should be noted that, in some embodiments, the magnet 620 may be located between the iron core 610 and the inner wall of the first chamber. In other embodiments, the magnet 620 may also be magnetically attached to the inner wall of the iron core.

[0092] Furthermore, such as Figure 5 As shown, the rotor assembly 10 also includes an impeller cover 500, which is connected to the impeller seat 400 to form an impeller assembly 300.

[0093] like Figure 8 and Figure 9 As shown, the rotor assembly 10 may further include a bearing assembly 100, which has a shaft hole 101 for fitting the bearing assembly 100 onto the rotating shaft 200. The bearing assembly 100, impeller seat 400, and magnetic ring assembly 600 are coaxially arranged with the rotating shaft 200. Part of the impeller seat 400 is fitted onto the bearing assembly 100, and part of the impeller seat 400 and the bearing assembly 100 form a first chamber 201.

[0094] Specifically, the bearing assembly 100 includes a first bearing 110, a third bearing 120, and a second bearing 130, the inner holes of the first bearing 110, the third bearing 120, and the second bearing 130 together form a shaft hole 101.

[0095] It should also be noted that the third bearing 120 is used to support the first bearing 110 and the second bearing 130. The bearing assembly adopts a segmented design, which has the advantages of lower processing difficulty and lower cost compared to a single-segment bearing.

[0096] For example, the first bearing 110 and the second bearing 130 can be made of wear-resistant materials such as graphite. The third bearing 120 can be made of plastic, specifically PPS plastic, to ensure structural strength.

[0097] like Figure 12 As shown, the processing technology of the rotor assembly 10 in this embodiment includes:

[0098] Step S1: Integral injection molding forms an impeller seat 400 with a connecting portion 416;

[0099] Step S2: Insert the magnet 620 into the impeller seat 400 through the connecting part 416.

[0100] It should be noted that, in some embodiments, the impeller seat 400 in step S1 has an iron core 610, a first bearing 110, and a second bearing 130 inside; the inner holes of the first bearing 110 and the second bearing 130 together form a shaft hole 101. During injection molding, the second bearing 130 can be press-fitted into the iron core 610, the mold shaft can be press-fitted into the second bearing 130, and the first bearing 110 can be sleeved on the outside of the mold shaft. After the iron core 610, the first bearing 110, and the second bearing 130 are assembled into a whole by the mold shaft, the impeller seat 400 is integrally injection molded. After the impeller seat 400 is injection molded, the mold shaft can be pulled out.

[0101] In some other embodiments, the impeller seat 400 in step S1 has an iron core 610, a first bearing 110, a second bearing 130, and a third bearing 120 inside. During injection molding, the second bearing 130 can be press-fitted into the iron core 610, and the mold shaft can be press-fitted into the second bearing 130. The third bearing 120 and the first bearing 110 are sequentially inserted into the outside of the mold shaft. After the first bearing 110, the second bearing 130, the third bearing 120, and the iron core 610 are assembled into a whole (embedded part 900) by the mold shaft, the impeller seat 400 is integrally injection molded. After the injection molding is completed, the mold shaft can be pulled out.

[0102] In step S1, the impeller seat 400 is formed by injection molding in one step, simplifying the processing technology, ensuring the processing accuracy of the rotor assembly 10, and reducing processing costs. Additionally, it should be noted that when injection molding the impeller seat 400, the magnetic ring assembly 600, including the iron core 610 and the magnet 620, requires reserving an installation position for the magnet 620. The magnet 620 is then assembled into the first chamber 201 in the subsequent step S2.

[0103] In step S2, since the impeller seat 400 has a connecting portion 416, the magnet 620 can be magnetically attached to the iron core 610 before being magnetized. Compared with the prior art of magnetizing before attachment, this effectively avoids the risk of the magnet breaking during the attachment process, making it impossible to replace later. Of course, the magnet 620 can also be magnetized first before being assembled into the impeller seat 400.

[0104] The specific structure of the impeller seat 400 is described below with reference to the attached drawings.

[0105] like Figure 5 , Figure 6 , Figure 7 and Figure 8As shown, in some embodiments, the impeller seat 400 includes a cylindrical body 410 and an impeller portion 420 disposed on the circumferential outer side of the cylindrical body 410. A portion of the cylindrical body 410 is used to fix the impeller seat 400, and another portion of the cylindrical body 410 forms a first chamber 201.

[0106] For example, the cylinder 410 is fitted onto a portion of the bearing assembly 100 and forms a first chamber 201 with the remaining at least a portion of the bearing assembly 100. Exemplarily, a portion of the cylinder 410 may be fitted onto the first bearing 110 and a portion of the third bearing 120. Another portion of the cylinder 410, together with the third bearing 120 and the second bearing 130, forms the first chamber 201.

[0107] like Figure 5 As shown, in some embodiments, the cylinder 410 includes a first cylindrical section 411, a transition plate 412, a second cylindrical section 414, and an end plate 415.

[0108] The impeller portion 420 is disposed on the circumferential outer side of the first cylindrical section 411. For example, the first cylindrical section 411 is fitted onto the first bearing 110 and part of the third bearing 120.

[0109] The inner diameter of the second cylindrical section 414 is larger than the inner diameter of the first cylindrical section 411. A transition plate 412 connects the first cylindrical section 411 and the second cylindrical section 414. An end plate 415 is connected to the end of the second cylindrical section 414 away from the transition plate 412. The transition plate 412, the second cylindrical section 414, and the end plate 415 form a first chamber 201. For example, the transition plate 412, the second cylindrical section 414, and the end plate 415 can form the first chamber 201 together with a portion of the third bearing 120 and a portion of the second bearing 130.

[0110] The connecting portion 416 can be disposed on the end plate 415. The end plate 415 helps to increase the strength of the cylinder 410. When the rotor assembly 10 rotates, the end plate 415 can effectively prevent the second cylindrical section 414 from deforming under the action of centrifugal force. The end plate 415 is opposite to the end face of the magnetic ring assembly 600 to facilitate the installation of the magnet 620 and subsequent magnetization of the magnet 620.

[0111] Specifically, such as Figure 5 and Figure 7 As shown, in some embodiments, the connecting portion 416 includes a mounting hole 417 for mounting a magnet 620.

[0112] like Figure 8 As shown, in some embodiments, a first magnetizing hole 611 is provided on the axial end face of the iron core 610, and the connecting part 416 further includes a second magnetizing hole 418 provided on the end plate 415. The second magnetizing hole 418 is connected to the first magnetizing hole 611 and is used to magnetize the magnet 620.

[0113] It should be noted that the diameter of the second magnetizing hole 418 can be larger than the diameter of the first magnetizing hole 611. If the first magnetizing hole 611 is set too small, the positioning post of the magnetizing fixture will be prone to breakage if it is positioned using the first magnetizing hole 611. By directly increasing the size of the second magnetizing hole 418, the positioning post of the magnetizing fixture can be positioned using the second magnetizing hole 418, thus ensuring the service life of the positioning post.

[0114] In other embodiments, the cylinder may also include only a first cylindrical section 411, a transition plate 412, and a second cylindrical section 414, with a connecting portion formed through the port of the second cylindrical section 414.

[0115] like Figure 10 and Figure 11 As shown, in some embodiments, the magnets 620 include multiple magnets, which are evenly arranged on the circumferential outer wall of the iron core. Multiple partition ribs 419 are also provided on the inner wall of the second cylindrical section 414, with partition ribs 419 provided between adjacent magnets 620, and the partition ribs 419 are in contact with the circumferential outer wall of the iron core 610.

[0116] Since the magnet 620 needs to be assembled after the impeller seat 400 is injection molded, sufficient assembly space for the magnet 620 must be reserved during injection molding. The partition rib 419 can be formed during injection molding, which can both define the assembly position of the magnet 620 and increase the strength of the second cylindrical section 414, reducing the probability of deformation of the second cylindrical section 414.

[0117] like Figure 5 and Figure 7 As shown, in some embodiments, the end plate 415 includes an annular plate 4151 and a plurality of connecting portions 4152 disposed on the circumferential edge of the annular plate 4151. The annular plate 4151 is sleeved on the bearing assembly 100, and the annular plate 4151 is connected to the partition rib 419 and the second cylindrical section 414 through the connecting portions 4152.

[0118] Specifically, the second magnetizing hole 418 can be disposed on the ring plate 4151. The ring plate 4151 can limit the iron core 610 in the axial direction. At the same time, the ring plate 4151 can also be connected to the second cylindrical section 414 to further reduce the probability of the second cylindrical section 414 deforming due to centrifugal force.

[0119] For example, the connecting part 4152 may be a connecting rib.

[0120] In other embodiments, the ring plate 4151 may also be connected to either the partition rib 419 or the second cylindrical segment 414 via the connecting portion 4152.

[0121] like Figure 8As shown, in some embodiments, the end plate 415 has a first end face 415a facing the magnetic ring assembly 600 and a second end face 415b facing away from the magnetic ring assembly 600, and the bearing assembly 100 has a third end face 130a near the end plate 415. Specifically, the third end face 130a is the end face of the second bearing 130 near the end plate 415.

[0122] During operation, the electric water pump is affected by turbulence, and the rotor assembly 10 is prone to axial movement (D1 direction). Therefore, the third end face 130a can be set to protrude from the second end face 415b to ensure that the bearing assembly 100 rubs against the housing and avoids friction between the end plate 415 and the housing, thereby extending the service life of the end plate 415.

[0123] In other embodiments, the third end face 130a may also be flush with the second end face 415b, which ensures the tightness of the connection between the end plate 415 and the bearing assembly 100.

[0124] Finally, it should be noted that the various embodiments / implementations provided in this application can be combined with each other without creating contradictions, and will not be described in detail here.

[0125] In the embodiments of this application, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term "multiple" refers to two or more unless otherwise expressly defined. The terms "install," "connect," "link," and "fix" should be interpreted broadly. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "link" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0126] In the description of the embodiments of the application, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", 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 application and simplifying the description, and do not indicate or imply that the device or unit 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 embodiments of the application.

[0127] The above are merely preferred embodiments of the application examples and are not intended to limit the application examples. For those skilled in the art, the application examples can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the application examples should be included within the protection scope of the application examples.

Claims

1. A rotor assembly characterized by, include: Impeller seat (400) has a first chamber (201); A magnetic ring assembly (600) is disposed within the first chamber (201); The impeller seat (400) is provided with a connecting portion (416) to allow the magnetic ring assembly (600) to communicate with the outside of the first chamber (201); the connecting portion (416) is opposite to the axial end face of the magnetic ring assembly (600).

2. The rotor assembly of claim 1, wherein The impeller seat (400) includes a cylindrical body (410) and an impeller portion (420) disposed on the circumferential outer side of the cylindrical body (410); a portion of the cylindrical body (410) is used to fix the impeller portion (420) and another portion of the cylindrical body (410) forms the first chamber (201).

3. The rotor assembly of claim 2, wherein, The cylindrical body (410) includes a first cylindrical section (411), a transition plate (412), and a second cylindrical section (414); The impeller portion (420) is disposed on the circumferential outer side of the first cylindrical section (411); The inner diameter of the second cylindrical section (414) is larger than the inner diameter of the first cylindrical section (411). The transition plate (412) connects the first cylindrical section (411) and the second cylindrical section (414). The transition plate (412) and the second cylindrical section (414) form the first chamber (201). The open end of the second cylindrical section (414) forms the connecting portion (416).

4. The rotor assembly of claim 2, wherein The cylindrical body (410) includes a first cylindrical section (411), a transition plate (412), a second cylindrical section (414), and an end plate (415); The impeller portion (420) is disposed on the circumferential outer side of the first cylindrical section (411); The inner diameter of the second cylindrical segment (414) is larger than the inner diameter of the first cylindrical segment (411). The transition plate (412) connects the first cylindrical segment (411) and the second cylindrical segment (414). The end plate (415) is connected to the end of the second cylindrical segment (414) away from the transition plate (412). The transition plate (412), the second cylindrical segment (414), and the end plate (415) form the first chamber (201). The connecting portion (416) is disposed on the end plate (415).

5. The rotor assembly of claim 1, wherein The magnetic ring assembly (600) includes a magnet (620), and the connecting portion (416) includes a mounting hole (417) facing the magnet (620), the mounting hole (417) being used to mount the magnet (620).

6. The rotor assembly of claim 4, wherein The magnetic ring assembly (600) includes an iron core (610) and a magnet (620), wherein the magnet (620) is magnetically connected to the iron core (610); The magnet (620) is located between the iron core (610) and the inner wall of the first chamber (201); Alternatively, the magnet (620) is magnetically attached to the inner wall of the iron core (610).

7. The rotor assembly of claim 6, wherein The iron core (610) has a first magnetizing hole (611); The connecting part (416) further includes a second magnetizing hole (418) disposed on the end plate (415), the second magnetizing hole (418) being connected to the first chamber (201).

8. The rotor assembly of claim 7, wherein The diameter of the second magnetizing hole (418) is larger than the diameter of the first magnetizing hole (611).

9. The rotor assembly of any of claims 6-8, wherein, The end plate (415) includes a ring plate (4151) and a plurality of connecting portions (4152) disposed on the circumferential edge of the ring plate (4151). The ring plate (4151) is connected to the second cylindrical section (414) through the connecting portions (4152).

10. The rotor assembly of claim 6, wherein, The magnet (620) includes a plurality of magnets, and the plurality of magnets (620) are evenly disposed on the circumferential outer wall of the iron core (610); The inner wall of the second cylindrical section (414) is also provided with a plurality of partition ribs (419), and the partition ribs (419) are provided between two adjacent magnet (620) pieces.

11. The rotor assembly of claim 10, wherein, The end plate (415) includes a ring plate (4151) and a plurality of connecting portions (4152) disposed on the circumferential edge of the ring plate (4151). The ring plate (4151) is connected to the partition rib (419) and / or the second cylindrical section (414) through the connecting portions (4152).

12. The rotor assembly of any one of claims 6-8, wherein, The rotor assembly further includes a bearing assembly (100) having a shaft hole (101) for fitting the bearing assembly (100) onto a rotating shaft (200); a portion of the impeller seat (400) is fitted onto the bearing assembly (100), and a portion of the impeller seat (400) and the bearing assembly (100) together form the first chamber (201).

13. The rotor assembly of claim 12, wherein, The end plate (415) has a first end face (415a) facing the magnetic ring assembly (600) and a second end face (415b) facing away from the magnetic ring assembly (600); the bearing assembly (100) has a third end face (130a) close to the end plate (415); The third end face (130a) is flush with the second end face (415b), or The third end face (130a) protrudes from the second end face (415b).

14. The rotor assembly of claim 12, wherein, The bearing assembly (100) includes a first bearing (110), a third bearing (120), and a second bearing (130) connected in sequence, wherein the inner holes of the first bearing (110), the third bearing (120), and the second bearing (130) together form a shaft hole (101); and / or The rotor assembly also includes an impeller cover (500) connected to the impeller seat (400).

15. The rotor assembly of any one of claims 1-8, wherein, The impeller seat (400) is an integral injection molded structure.

16. An electronic water pump characterized by include: The housing (700) has a second chamber (701); A rotating shaft (200) is rotatably disposed in the second chamber (701); The rotor assembly (10) is sleeved on the rotating shaft (200) and can rotate synchronously with the rotating shaft (200). The rotor assembly (10) is the rotor assembly according to any one of claims 1-15.

17. The electronic water pump of claim 16, wherein, The housing (700) includes a pump head (710) and a pump casing (720), the pump head (710) and the pump casing (720) forming the second chamber (701); The electronic water pump (20) also includes a gasket (800) sandwiched between the pump head (710) and the rotor assembly (10).

18. The electronic water pump of claim 17, wherein, The pump head (710) includes a cover (711) and a mounting part (712) connected to the cover (711). The cover (711) covers the housing (700), and the gasket (800) is sandwiched between the mounting part (712) and the rotor assembly (10). An anti-rotation structure is provided between the mounting part (712) and the gasket (800) to prevent rotation of the mounting part (712) and the gasket (800).

19. The electronic water pump of claim 18, wherein, The anti-rotation structure includes a protrusion (7121) and a groove (810) that engages with the protrusion (7121). The protrusion (7121) is disposed in one of the mounting portion (712) and the gasket (800), and the groove (810) is disposed in the other of the mounting portion (712) and the gasket (800).

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