Electronic water pump, thermal management system and vehicle

Abstract

The utility model discloses an electronic water pump, a heat management system and a vehicle. The electronic water pump comprises a machine shell, the machine shell is provided with a containing cavity, an impurity groove is formed in the inner circumferential face of the containing cavity, and the impurity groove is used for storing impurities in the containing cavity; and the rotor assembly is rotatably arranged in the accommodating cavity, and a preset gap is formed between the outer circumferential surface of the rotor assembly and the inner circumferential surface of the accommodating cavity. According to the electronic water pump, the impurity groove is formed in the inner circumferential face of the containing cavity and used for storing the impurities in the containing cavity, the problem that the rotor assembly is affected by the impurities and is large in friction resistance and even stuck can be effectively solved, and the service life of the electronic water pump is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of electronic water pump technology, and more specifically, to an electronic water pump, a thermal management system, and a vehicle. Background Technology

[0002] Electric water pumps are widely used due to their advantages such as high efficiency and precise control. In related technologies, to meet the performance requirements of the motor, the air gap between the stator core and rotor core of the electric water pump is required to be small. This results in a very small gap between the inner wall of the stator and the outer wall of the rotor. If large impurities or impurities accumulated during long-term operation enter this gap, it can lead to increased friction during rotor rotation or even jamming, thus shortening the service life of the electric water pump. Utility Model Content

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. Therefore, one objective of the present invention is to provide an electronic water pump that can reduce the impact of impurities on the rotation of the rotor assembly and improve its service life.

[0004] This utility model also proposes a thermal management system having the above-mentioned electronic water pump.

[0005] This utility model also proposes a vehicle having the above-mentioned thermal management system.

[0006] An electronic water pump according to an embodiment of the present invention includes: a housing having a receiving cavity, the inner circumferential surface of the receiving cavity being provided with an impurity groove for storing impurities in the receiving cavity; and a rotor assembly rotatably disposed in the receiving cavity, the outer circumferential surface of the rotor assembly being spaced apart from the inner circumferential surface of the receiving cavity by a predetermined gap.

[0007] According to the embodiment of the present invention, the electronic water pump has an impurity groove set on the inner circumferential surface of the receiving cavity to store impurities in the receiving cavity. This can effectively improve the problem of high frictional resistance or even jamming of the rotor assembly due to impurities, and improve the service life of the electronic water pump.

[0008] In addition, the electronic water pump according to the above embodiments of this utility model may also have the following additional technical features:

[0009] According to some embodiments of the present invention, the accommodating cavity is open at one axial end and has a bottom wall at the other axial end. In the axial direction of the rotor assembly, the impurity groove has a first end near the bottom wall and a second end near the open opening of the accommodating cavity. The first end is located on the side of the rotor assembly near the bottom wall.

[0010] According to some embodiments of the present invention, the first end of the impurity tank extends to the bottom wall.

[0011] According to some embodiments of the present invention, the second end of the impurity groove extends to the opening of the receiving cavity.

[0012] According to some embodiments of the present invention, the distance between the outer peripheral surface of the rotor assembly and the inner peripheral surface of the receiving cavity is L1, the depth of the impurity groove along the radial direction of the rotor assembly is L2, and L2 / L1 is greater than or equal to 0.5.

[0013] According to some embodiments of the present invention, the electronic water pump further includes a stator assembly, which is injection molded around the housing and arranged around the receiving cavity. The stator assembly includes a stator core with stator slots, and the radial projection of the impurity slots at least partially overlaps with that of the stator slots.

[0014] According to some embodiments of the present invention, in the circumferential direction of the stator core, the distance between the edge of the impurity groove opening and the corresponding edge of the stator groove opening is greater than or equal to 1 mm; and / or, in the circumferential direction of the stator core, the distance between the edge of the impurity groove opening and the corresponding edge of the stator groove opening is L3, and the distance between the inner circumferential surface of the receiving cavity and the inner circumferential surface of the stator core is L4, where L3 equals L4.

[0015] According to some embodiments of the present invention, there are multiple impurity slots, and the number of impurity slots is less than or equal to the number of stator slots.

[0016] According to some embodiments of the present invention, the electronic water pump further includes a stator assembly, which is injection molded around the housing and arranged around the receiving cavity. The stator assembly includes a stator core, and the minimum distance between the wall of the impurity groove and the stator core is greater than or equal to 0.3 mm.

[0017] According to some embodiments of the present invention, there are multiple impurity grooves, and the multiple impurity grooves are evenly spaced along the circumference of the rotor assembly.

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

[0019] The 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 this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

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

[0022] Figure 1 This is a cross-sectional view of a portion of the structure of an electronic water pump according to an embodiment of the present utility model, parallel to the axial direction.

[0023] Figure 2 This is a partial sectional view perpendicular to the axial direction of an electronic water pump according to an embodiment of the present utility model;

[0024] Figure 3 yes Figure 2 The center circle shows an enlarged structural diagram at point A.

[0025] Figure 4 This is a schematic diagram of a vehicle according to an embodiment of the present utility model.

[0026] Figure label:

[0027] Thermal management system 1000; Vehicles 2000;

[0028] 100 electronic water pumps;

[0029] Support shaft 10;

[0030] Casing 20; Receiving cavity 201; Impurity tank 202; First end 203; Second end 204; Bottom wall 21;

[0031] Stator assembly 30; stator core 31; stator slot 311; stator winding 32;

[0032] Rotor assembly 40. Detailed Implementation

[0033] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0034] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0035] In the description of this utility model, "first feature" and "second feature" may include one or more of the features, "multiple" means two or more, "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 being in contact through another feature between them, and "first feature above", "above" and "over" the second feature may include the first feature being directly above or diagonally above the second feature, or simply indicate that the first feature is at a higher horizontal level than the second feature.

[0036] The electronic water pump 100 according to an embodiment of the present invention is described below with reference to the accompanying drawings.

[0037] Reference Figure 1 and Figure 2 As shown, the electronic water pump 100 according to an embodiment of the present invention may include: a housing 20 and a rotor assembly 40.

[0038] Specifically, the housing 20 has a receiving cavity 201, and the inner peripheral surface of the receiving cavity 201 is provided with an impurity groove 202 for storing impurities in the receiving cavity 201. The rotor assembly 40 is rotatably disposed in the receiving cavity 201, and the outer peripheral surface of the rotor assembly 40 is spaced apart from the inner peripheral surface of the receiving cavity 201 by a predetermined gap.

[0039] The receiving cavity 201 provides space for the installation of the rotor assembly 40, facilitating the cooperation between the stator assembly 30 and the rotor assembly 40 to drive the rotor assembly 40 to rotate. For example, the electric water pump 100 may also include a stator assembly 30, with the housing 20 enclosing the stator assembly 30 and the stator assembly 30 arranged around the receiving cavity 201, thereby arranging the stator assembly 30 around the rotor assembly 40. As another example, the housing 20 may have a support shaft 10, which is fixed to the bottom wall 21 at one axial end of the receiving cavity 201 by injection molding or other means. The rotor assembly 40 is fitted onto the support shaft 10 and is rotatable relative to the support shaft 10.

[0040] The outer peripheral surface of the rotor assembly 40 is spaced apart from the inner peripheral surface of the receiving cavity 201 by a predetermined gap. On the one hand, this prevents the rotor assembly 40 from contacting the inner peripheral surface of the receiving cavity 201 and causing friction during rotation, thus ensuring smooth rotation of the rotor assembly 40 and better pumping effect. On the other hand, by controlling the size of the predetermined gap, a suitable distance can be formed between the rotor assembly 40 and the stator assembly 30, thereby forming a suitable air gap between the stator core 31 and the rotor core, which is beneficial to improving the performance of the electronic water pump 100.

[0041] Furthermore, when impurities enter the receiving cavity 201 due to external impurities or impurities formed during long-term operation, the predetermined gap between the outer peripheral surface of the rotor assembly 40 and the inner peripheral surface of the receiving cavity 201 can provide a certain amount of space for the impurities to move, so that smaller impurities will not interfere with the rotation of the rotor assembly 40.

[0042] Furthermore, by providing the impurity groove 202, the distance between the outer peripheral surface of the rotor assembly 40 and the inner peripheral surface of the housing 20 can be increased in the area where the impurity groove 202 is located without affecting the air gap, providing more space for impurities. Thus, larger impurities can enter and be stored in the impurity groove 202 as the rotor assembly 40 rotates. Of course, some smaller impurities can also enter and be stored in the impurity groove 202, thereby reducing or avoiding the presence of large or numerous impurities between the outer peripheral surface of the rotor assembly 40 and the inner peripheral surface of the receiving cavity 201, which would increase rotational friction and reduce the likelihood of the rotor assembly 40 jamming. This helps to improve the service life of the electronic water pump 100.

[0043] According to the embodiment of the present invention, the electronic water pump 100 has an impurity groove 202 provided on the inner circumferential surface of the receiving cavity 201 to store impurities in the receiving cavity 201. This can effectively improve the problem of high frictional resistance or even jamming of the rotor assembly 40 due to impurities, and improve the service life of the electronic water pump 100.

[0044] In the embodiments of this utility model, the number and shape of the impurity grooves 202 can be flexibly set according to the actual situation.

[0045] For example, there can be one or more impurity grooves 202. Multiple impurity grooves 202 can be arranged at intervals along the circumference or axial direction of the receiving cavity 201 so that impurities at different locations in the receiving cavity 201 can enter and be stored in the impurity grooves 202 as soon as possible, thereby reducing wear on the rotor assembly 40.

[0046] In some specific embodiments, there are multiple impurity channels 202, which are evenly spaced along the circumference of the rotor assembly 40. Multiple impurity channels 202 improve the efficiency of impurity collection at different positions along the circumference of the rotor assembly 40, and the evenly arranged channels improve the symmetry of the housing 20, which is beneficial to improving the stability of the electronic water pump 100.

[0047] The impurity tank 202 can be elongated, circular, annular, mesh, etc., and its cross-sectional shape perpendicular to the extension direction can be rectangular, triangular, semi-circular, irregular, etc. For example, the impurity tank 202 can be as follows: Figure 1 The groove shown is elongated, with its length parallel to the axial direction of the receiving cavity 201, or its length can extend obliquely relative to the axial direction of the receiving cavity 201. For example, the impurity groove 202 can be an annular groove extending circumferentially along the receiving cavity 201.

[0048] Among them, the elongated groove that extends roughly along the axial direction of the receiving cavity 201 occupies less space in the circumferential direction of the receiving cavity 201. It can still achieve the collection of impurities over a large range when it rotates with the rotor assembly 40, and has little impact on the wall thickness of the housing 20. Moreover, the elongated groove occupies more space in the axial direction of the receiving cavity 201, which can achieve the collection of impurities over a larger range in the axial direction of the rotor assembly 40, thereby improving the efficiency and effectiveness of impurity collection.

[0049] In some embodiments of this utility model, such as Figure 1 As shown, one axial end of the receiving cavity 201 is open, and the other axial end of the receiving cavity 201 has a bottom wall 21. This allows the rotor assembly 40 to be inserted into the receiving cavity 201 through the open end of the receiving cavity 201 during assembly, and to be supported and limited by the bottom wall 21 or other components mounted on the bottom wall 21.

[0050] Furthermore, in the axial direction of the rotor assembly 40, the impurity groove 202 has a first end 203 near the bottom wall 21 (e.g., Figure 1 The lower end shown) and the second end 204 near the open opening of the receiving cavity 201 (as shown) Figure 1 (As shown in the upper part). The first end 203 of the impurity groove 202 is located on the side of the rotor assembly 40 near the bottom wall 21. In other words, the impurity groove 202 extends beyond the rotor assembly 40 in the direction near the bottom wall 21. Figure 1 The lower end face shown allows the impurity groove 202 to have a larger span in the axial direction of the rotor assembly 40, enabling the collection of impurities over a larger range in the axial direction of the rotor assembly 40.

[0051] In some specific embodiments, reference continues to be made to... Figure 1 As shown, the first end 203 of the impurity tank 202 extends to the bottom wall 21. Here, with Figure 1 Taking the orientation shown as an example, the lower end of the impurity groove 202 can be flush with the surface of the bottom wall 21, and the lower end of the impurity groove 202 can also be partially formed on the bottom wall 21. Therefore, even if the rotor assembly 40 moves a certain distance in the axial direction, the lower end face of the rotor assembly 40 will not exceed the lower end of the impurity groove 202, which helps to keep the rotor assembly 40 within the effective range of the impurity groove 202 and realize impurity collection.

[0052] In some embodiments, such as Figure 1 As shown, the second end 204 of the impurity tank 202 (as shown) Figure 1 The upper end (as shown) extends to the open end of the receiving cavity 201. On the one hand, the impurity groove 202 has a large span in the axial direction of the rotor assembly 40, which can realize the collection of impurities in a larger range in the axial direction of the rotor assembly 40, thereby improving the impurity collection effect and efficiency. On the other hand, during the molding of the housing 20 and the processing of the impurity groove 202, the impurity groove 202 has an opening at the open end of the receiving cavity 201, which makes the processing easier. For example, the housing 20 can be formed simultaneously by injection molding of the impurity groove 202. The impurity groove 202 with an opening is convenient for demolding after injection molding, reducing the processing difficulty.

[0053] According to some embodiments of this utility model, such as Figure 2 and Figure 3 As shown, the distance between the outer peripheral surface of the rotor assembly 40 and the inner peripheral surface of the receiving cavity 201 is L1, and the depth of the impurity groove 202 along the radial direction of the rotor assembly 40 is L2, where L2 / L1 is greater than or equal to 0.5. Within the above ratio range, the depth of the impurity groove 202 is sufficiently large to meet the requirements for impurity collection and storage, and to better reduce the impact of impurities on the rotation of the rotor assembly 40. For example, in some specific embodiments, L2 / L1 can be 0.5, 0.6, 0.7, 0.8, 0.9, and 1, etc.

[0054] According to some embodiments of this utility model, such as Figure 1 and Figure 2 As shown, the electronic water pump 100 includes a stator assembly 30. A housing 20 is injection molded to enclose the stator assembly 30, and the stator assembly 30 is arranged around the receiving cavity 201 to facilitate protection of the stator assembly 30 and to facilitate the mating of the stator assembly 30 with the rotor assembly 40. For example, during the production process, the stator assembly 30 can be placed into a mold for injection molding the housing 20, and then the housing 20 can be cast, thus simultaneously enclosing the stator assembly 30 within the housing 20.

[0055] In addition, the stator assembly 30 includes a stator core 31 having a stator slot 311, and the impurity slot 202 at least partially overlaps with the radial projection of the stator slot 311.

[0056] When the housing 20 is injection molded to encapsulate the stator assembly 30, a portion of the housing 20 is located within the stator slot 311. The portion of the impurity slot 202 that overlaps with the radial projection of the stator slot 311, i.e., the portion of the impurity slot 202 corresponding to the overlapping portion, is located on the portion of the housing 20 located within the stator slot 311. The radial thickness of the portion of the housing 20 located within the stator slot 311 is greater than the thickness of other portions of the housing 20 (such as the thickness of the portion of the housing 20 located radially inside the stator teeth). This makes the impact of setting the impurity slot 202 on the overall thickness of this portion of the housing 20 relatively small. Not only does it not affect the molding difficulty of the housing 20, but the housing 20 also has sufficient thickness to encapsulate and protect the stator assembly 30, making it less likely to affect the insulation and waterproofing effects of the stator assembly 30.

[0057] In some embodiments, such as Figure 2 and Figure 3 As shown, in the circumferential direction of the stator core 31, the distance between the edge of the slot opening of the impurity groove 202 and the corresponding edge of the slot opening of the stator groove 311 is L3, where L3 is greater than or equal to 1 mm. For example, in some specific embodiments, L3 can be 1 mm, 1.2 mm, 1.5 mm, etc.

[0058] Within the above range of values, the wall thickness of the housing 20 on both sides of the impurity groove 202 is large enough to meet the requirements of housing 20 forming and sealing protection in the circumferential direction of the stator core 31.

[0059] In some embodiments, such as Figure 2 and Figure 3 As shown, in the circumferential direction of the stator core 31, the distance between the edge of the impurity groove 202 and the corresponding edge of the stator groove 311 is L3, and the distance between the inner circumferential surface of the receiving cavity 201 and the inner circumferential surface of the stator core 31 is L4, where L3 equals L4. Therefore, the wall thickness of different areas of the housing 20 is more uniform, resulting in more uniform shrinkage during the molding process of the housing 20, reducing the likelihood of cracks or other defects that could affect the sealing and protective effect.

[0060] In some embodiments, such as Figure 1 and Figure 2 As shown, there are multiple impurity grooves 202, and the number of impurity grooves 202 is less than or equal to the number of stator grooves 311. Therefore, each impurity groove 202 can be correspondingly set with one stator groove 311, so that the wall thickness of the housing 20 near each impurity groove 202 can meet the sealing and protection requirements, and it is not easy for areas of excessively thin housing 20 wall thickness to appear.

[0061] In one specific embodiment, the number of impurity slots 202 and stator slots 311 are equal, and the multiple impurity slots 202 are arranged in a one-to-one correspondence with the multiple stator slots 311.

[0062] According to some embodiments of this utility model, such as Figure 2 and Figure 3As shown, the electronic water pump 100 includes a stator assembly 30, which is injection molded and encapsulated by a housing 20. The stator assembly 30 is arranged around the receiving cavity 201. The stator assembly 30 includes a stator core 31. The minimum distance between the wall of the impurity groove 202 and the stator core 31 is greater than or equal to 0.3 mm.

[0063] Here, the location of the impurity groove 202 varies, and the position of the minimum distance between the groove wall surface of the impurity groove 202 and the stator core 31 differs. For example, in the embodiment where the impurity groove 202 is located radially inside the stator teeth, the minimum distance is the distance between the inner circumferential surface of the stator teeth and the groove wall surface of the impurity groove 202; as another example... Figure 3 As shown, in the embodiment where the impurity groove 202 and the stator groove 311 are arranged radially opposite each other, the minimum distance is the distance between the edge of the groove opening of the stator groove 311 and the groove wall of the impurity groove 202.

[0064] By ensuring that the minimum distance between the impurity groove 202 wall and the stator core 31 is within the aforementioned range, the minimum wall thickness of the housing 20 near the impurity groove 202 is greater than or equal to 0.3 mm, thereby meeting the molding and sealing protection requirements of the housing 20.

[0065] In some embodiments, the minimum distance between the wall of the impurity groove 202 and the stator core 31 is greater than or equal to 1 mm, so as to further improve the forming and sealing protection effect of the housing 20.

[0066] In some specific embodiments, the minimum distance between the wall of the impurity groove 202 and the stator core 31 can be 0.3mm, 0.5mm, 1mm, 1.5mm, etc.

[0067] In some embodiments, the housing 20 and the support shaft 10 are injection molded together. For example, the housing 20 can be an injection molded body, and the support shaft 10 can be connected to the housing 20 during injection molding, allowing the support shaft 10 to be stably mounted on the housing 20. This eliminates the need for separate molding and assembly, and makes the connection between the housing 20 and the support shaft 10 more reliable. Simultaneously, the impurity groove 202 can be formed during the injection molding of the housing 20, eliminating the need for a separate processing step to obtain the impurity groove 202, thus improving production efficiency.

[0068] The following describes in detail an electronic water pump 100 according to a specific embodiment of the present invention with reference to the accompanying drawings. It is to be understood that the following description is merely illustrative and should not be construed as limiting the present invention.

[0069] like Figures 1-3As shown, the electronic water pump 100 according to an embodiment of the present invention includes a housing 20, a pump cover, a stator assembly 30, a rotor assembly 40, an impeller assembly, and a support shaft 10. The housing 20 has a receiving cavity 201, and the pump cover has a pump chamber and seals the end opening of the receiving cavity 201. The housing 20 is an injection-molded body, and the stator assembly 30 and one end of the support shaft 10 are injection-molded and encapsulated. The stator assembly 30 is arranged around the receiving cavity 201, and one end of the support shaft 10 is injection-molded and connected to the end wall of one axial end of the receiving cavity 201. The support shaft 10 is partially located inside the receiving cavity 201. The rotor assembly 40 is located inside the receiving cavity 201 and is rotatably sleeved on the support shaft 10. The impeller assembly is located inside the pump chamber and connected to the rotor assembly 40. The impeller assembly rotates under the drive of the rotor assembly 40 to realize the pumping of liquid in the pump chamber.

[0070] The inner circumferential surface of the receiving cavity 201 is provided with multiple elongated impurity grooves 202, the length direction of which is parallel to the axial direction of the rotor assembly 40. The impurity grooves 202 can be used to store some impurities that enter the receiving cavity 201 or some impurities formed during long-term operation, so that the friction of the rotor assembly 40 is not easily increased or even jammed.

[0071] Within the stator slots 311 of the stator core 31, part is used to arrange the stator windings 32, and part is filled by the housing 20, resulting in a relatively thick wall of the housing 20 within the stator slots 311. The number of impurity slots 202 is equal to the number of stator slots 311 in the stator core 31, and the impurity slots 202 are radially opposite to the stator slots 311, facilitating their arrangement and ensuring sufficient wall thickness for slotting in this area of ​​the housing 20.

[0072] The size and depth of the impurity groove 202 are such that the minimum distance between the groove wall of the impurity groove 202 and the stator core 31 is greater than or equal to 0.3mm, thereby allowing the housing 20 to have a suitable injection molding wall thickness.

[0073] The two ends of the impurity groove 202 extend to the bottom wall 21 of the receiving cavity 201 and the opening of the receiving cavity 201, respectively, which facilitates the design of the injection mold and maximizes the storage of impurities.

[0074] The cross-sectional shape of the impurity tank 202 perpendicular to the axial direction of the rotor assembly 40 can be semi-circular, rectangular, triangular, etc., which can meet the requirements for impurity collection and storage.

[0075] like Figure 4As shown, the thermal management system 1000 according to an embodiment of the present invention includes an electronic water pump 100 according to an embodiment of the present invention. Since the electronic water pump 100 according to an embodiment of the present invention has the aforementioned beneficial technical effects, the thermal management system 1000 according to an embodiment of the present invention, by providing an impurity groove 202 on the inner circumferential surface of the receiving cavity 201 to store impurities within the receiving cavity 201, can effectively improve the problem of high frictional resistance or even jamming of the rotor assembly 40 due to impurities, thereby increasing the service life of the electronic water pump 100.

[0076] In some embodiments, the thermal management system 1000 is an important component for regulating the automotive cabin environment (temperature, humidity, etc.) and the working environment of other parts. The thermal management system 1000 mainly includes valves, heat exchangers, compressors, and pumps. The pumps include, for example, an electric water pump 100 or other water pumps. The thermal management system 1000 contains a circulating refrigerant, which may be carbon dioxide refrigerant, etc.

[0077] like Figure 4 As shown, the 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, the vehicle 2000 according to an embodiment of the present invention, by providing an impurity groove 202 on the inner circumferential surface of the receiving cavity 201 to store impurities within the receiving cavity 201, can effectively improve the problem of high frictional resistance or even jamming of the rotor assembly 40 due to impurities, thereby increasing the service life of the electronic water pump 100.

[0078] In this embodiment, 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 both 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 be a power battery, hydrogen fuel cell, etc., without special limitations. It should be noted that this is merely an exemplary description of the structure of new energy vehicles, etc., and is not intended to limit the scope of protection of this utility model.

[0079] Other configurations and operations of the electronic water pump 100, thermal management system 1000, and vehicle 2000 according to embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0080] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0081] In the description of this specification, the references to terms such as "embodiment," "specific embodiment," and "example" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0082] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An electronic water pump characterized by, Comprising: a housing having a receiving cavity, an inner circumferential surface of the receiving cavity being provided with an impurity groove for storing impurities in the receiving cavity; a rotor assembly rotatably provided in the receiving cavity, and an outer circumferential surface of the rotor assembly being spaced apart from the inner circumferential surface of the receiving cavity by a predetermined gap.

2. The electronic water pump of claim 1, wherein, An axial one end of the receiving cavity is open and an axial other end has a bottom wall, in an axial direction of the rotor assembly, the impurity groove has a first end close to the bottom wall and a second end close to an open mouth of the receiving cavity, the first end being located at a side of the rotor assembly close to the bottom wall.

3. The electronic water pump of claim 2, wherein, The first end of the impurity groove extends to the bottom wall.

4. The electronic water pump of claim 2, wherein, The second end of the impurity groove extends to the open mouth of the receiving cavity.

5. The electronic water pump of claim 1, wherein, The gap between the outer circumferential surface of the rotor assembly and the inner circumferential surface of the receiving cavity is L1, a depth of the impurity groove along a radial direction of the rotor assembly is L2, and L2 / L1 is greater than or equal to 0.

5.

6. The electronic water pump of claim 1, wherein, Further comprising a stator assembly, the housing injection-molding wraps the stator assembly, and the stator assembly is arranged around the receiving cavity, the stator assembly comprises a stator core, the stator core has a stator groove, and a radial projection of the impurity groove at least partially coincides with the stator groove.

7. The electronic water pump of claim 6, wherein, In a circumferential direction of the stator core, a gap between a slot opening edge of the impurity groove and a slot opening edge of a corresponding side of the stator groove is greater than or equal to 1 mm; and / or, In a circumferential direction of the stator core, a gap between a slot opening edge of the impurity groove and a slot opening edge of a corresponding side of the stator groove is L3, a gap between the inner circumferential surface of the receiving cavity and an inner circumferential surface of the stator core is L4, and L3 is equal to L4.

8. The electronic water pump of claim 6, wherein, The impurity groove is a plurality of, and a number of the impurity groove is less than or equal to a number of the stator groove.

9. The electronic water pump of claim 1, wherein, Further comprising a stator assembly, the housing injection-molding wraps the stator assembly, and the stator assembly is arranged around the receiving cavity, the stator assembly comprises a stator core, and a minimum gap between a slot wall surface of the impurity groove and the stator core is greater than or equal to 0.3 mm.

10. The electronic water pump of claim 1, wherein, The impurity groove is a plurality of, and a plurality of the impurity groove is uniformly and spaced apart arranged along a circumferential direction of the rotor assembly.

11. A thermal management system, characterized by, Comprising the electronic water pump according to any one of claims 1-10.

12. A vehicle characterized by comprising: Comprising the thermal management system according to claim 11.

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