Electronic water pump, thermal management system, and vehicle

Abstract

The utility model discloses a kind of electronic water pump, thermal management system and vehicle, electronic water pump, comprising: shell, the shell has the installation cavity and pump cavity with intercommunication;Impeller rotor assembly, the impeller rotor assembly includes impeller part and rotor part, the impeller part is located in the pump cavity, the rotor part is located in the installation cavity, the axial one end of the rotor part is connected with the impeller part, wherein, the rotor part is equipped with first communication channel, the first communication channel is through the rotor part along axial direction, to communicate the space of the axial both sides of the rotor part.Electronic water pump according to the utility model embodiment, by being set to the first communication channel of axial penetration in rotor part, the liquid pressure difference of the axial both sides of rotor part can be balanced, effectively improve the axial excursion problem of rotor part, reduce vibration noise, improve the NVH performance of electronic water pump.

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] With the rapid development of the new energy vehicle industry, electronic water pumps are gradually replacing traditional mechanical water pumps. When an electronic water pump operates, the flow of liquid, such as coolant, is controlled by the rotation of the impeller rotor assembly. As the impeller rotor assembly rotates, it axially oscillates, causing vibration and noise. 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 improves the vibration and noise problem caused by axial movement of the rotor.

[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 connected mounting cavity and a pump cavity; and an impeller rotor assembly including an impeller portion and a rotor portion, wherein the impeller portion is located within the pump cavity, the rotor portion is located within the mounting cavity, one axial end of the rotor portion is connected to the impeller portion, and the rotor portion is provided with a first connecting channel that axially penetrates the rotor portion to connect the spaces on both axial sides of the rotor portion.

[0007] According to the embodiment of the present invention, the electronic water pump can balance the liquid pressure difference on both sides of the rotor by setting an axially penetrating first connecting channel in the rotor, effectively improving the axial movement problem of the rotor, reducing vibration and noise, and improving the NVH performance 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 first connecting channel extends axially along the rotor portion.

[0010] According to some embodiments of the present invention, there are multiple first connecting channels, and the multiple first connecting channels are evenly spaced along the circumference of the rotor portion.

[0011] According to some embodiments of the present invention, the rotor section includes a rotor core and a permanent magnet, the permanent magnet being axially disposed through the rotor core, and the first connecting channel being disposed in the rotor core and staggered from the permanent magnet.

[0012] According to some embodiments of the present invention, the impeller rotor assembly further includes a connecting portion, the connecting portion connecting the impeller portion and the rotor portion, and the connecting portion having a cavity, the cavity communicating with a flow channel in the impeller portion, and the first communicating channel communicating with the cavity and the mounting cavity.

[0013] According to some embodiments of the present invention, the connecting part is provided with a second communicating channel, which connects the cavity and the mounting cavity.

[0014] According to some embodiments of the present invention, the second communicating channel extends radially along the rotor portion.

[0015] According to some embodiments of the present invention, there are multiple second connecting channels, and the multiple second connecting channels are evenly spaced along the circumference of the connecting portion.

[0016] According to some embodiments of the present invention, the electronic water pump further includes a thrust portion and a mounting shaft. The mounting shaft is located in the mounting cavity and connected to the housing. The rotor portion is rotatably mounted on the mounting shaft. The thrust portion is mounted on the housing or the mounting shaft. The thrust portion is at least partially located in the cavity and stops the rotor portion on the side facing the impeller portion.

[0017] 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.

[0018] The vehicle according to an embodiment of the present invention includes a thermal management system according to an embodiment of the present invention.

[0019] 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

[0020] 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:

[0021] Figure 1 This is a schematic diagram of the structure of an electronic water pump according to an embodiment of the present utility model;

[0022] Figure 2 This is a schematic diagram of the structure of an impeller rotor assembly according to some embodiments of the present invention;

[0023] Figure 3 yes Figure 2 Cross-sectional view at the rotor section;

[0024] Figure 4 This is a schematic diagram of the structure of an impeller rotor assembly according to other embodiments of the present invention;

[0025] Figure 5 yes Figure 4 Sectional view at the connection point;

[0026] Figure 6 This is a schematic diagram of a vehicle according to an embodiment of the present utility model.

[0027] Figure label:

[0028] 100 electronic water pumps; 200 thermal management systems; 300 vehicles;

[0029] Housing 10; Mounting cavity 101; Pump cavity 102; Liquid inlet 103;

[0030] Impeller rotor assembly 20; first connecting channel 201; second connecting channel 202; impeller section 21; flow channel 211; rotor section 22; rotor core 221; permanent magnet 222; injection molded body 223; connecting part 23; cavity 231;

[0031] Mounting shaft 30. Detailed Implementation

[0032] 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.

[0033] 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.

[0034] 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.

[0035] With the rapid development of the new energy vehicle industry, electronic water pumps are gradually replacing traditional mechanical water pumps. When an electronic water pump operates, the flow of liquid, such as coolant, is controlled by the rotation of the impeller rotor assembly. As the impeller rotor assembly rotates, the liquid pressure on both sides of the rotor's axial direction is uneven, causing the impeller rotor assembly to move axially, resulting in vibration and noise.

[0036] In view of this, this application proposes an electronic water pump 100, wherein the impeller rotor assembly 20 can balance the pressure difference between the upper and lower parts of the rotor section 22 to suppress axial movement, reduce noise, and improve the NVH performance of the electronic water pump 100.

[0037] The electronic water pump 100 according to an embodiment of the present invention is described below with reference to the accompanying drawings.

[0038] Reference Figure 1 As shown, the electronic water pump 100 according to an embodiment of the present invention may include: a housing 10 and an impeller rotor assembly 20.

[0039] Specifically, the housing 10 has a connected mounting cavity 101 and a pump cavity 102, and the impeller rotor assembly 20 includes an impeller portion 21 and a rotor portion 22. The impeller portion 21 is located inside the pump cavity 102, and the rotor portion 22 is located inside the mounting cavity 101. One axial end of the rotor portion 22 is connected to the impeller portion 21. The rotor portion 22 is provided with a first connecting channel 201, which extends axially through the rotor portion 22 to connect the spaces on both axial sides of the rotor portion 22.

[0040] The housing 10 provides mounting space for components such as the impeller rotor assembly 20 and provides a flow path for the liquid. For example, in some embodiments, the housing 10 includes a casing and a pump casing. The casing defines a mounting cavity 101 that is open at one end axially, and the pump casing covers the opening side of the mounting cavity 101, with the pump casing cooperating with the casing to define a pump chamber 102. The stator assembly of the electric water pump 100 can be injection molded and encased within the casing so that the stator assembly can be arranged around the rotor portion 22 to drive the rotor portion 22 to rotate, thereby driving the impeller portion 21 to rotate and realize liquid pumping.

[0041] During the rotation of the impeller rotor assembly 20, liquid enters the pump chamber 102 under the drive of the impeller section 21, is pressurized, and then discharged from the pump chamber 102, resulting in a higher liquid pressure on the side of the rotor section 22 closer to the impeller section 21 in the axial direction. Since the mounting chamber 101 is connected to the pump chamber 102, some liquid enters the mounting chamber 101, meaning there is liquid in the gap between the outer surface of the rotor section 22 and the inner wall of the mounting chamber 101, where the liquid pressure is lower. Therefore, the liquid pressure on the side of the rotor section 22 closer to the impeller section 21 in the axial direction is greater than the liquid pressure on the side of the rotor section 22 farther from the impeller section 21 in the axial direction, resulting in unequal liquid pressures on both sides of the rotor section 22 in the axial direction.

[0042] The first connecting channel 201 extends axially through the rotor section 22, forming a liquid internal circulation channel inside the impeller rotor assembly 20. That is, the first connecting channel 201 connects the spaces on both sides of the rotor section 22 in the axial direction, allowing the liquid on both sides to flow from the high-pressure side to the low-pressure side through the first connecting channel 201, thereby balancing the pressure difference on both sides of the rotor section 22 in the axial direction, suppressing the axial movement of the rotor section 22, reducing the vibration and noise of the structure, and improving the NVH performance of the electronic water pump 100.

[0043] According to the embodiment of the present invention, the electronic water pump 100 can balance the liquid pressure difference on both sides of the rotor 22 by providing an axially penetrating first connecting channel 201 in the rotor 22, effectively improving the axial movement problem of the rotor 22, reducing vibration and noise, and improving the NVH performance of the electronic water pump 100.

[0044] It is worth noting that the extension path of the first connecting channel 201 is not limited. For example, it can extend along a straight line, an arc, or a combination of a straight line and an arc. It is only necessary that the openings at both ends of the first connecting channel 201 are formed on both axial sides of the rotor part 22 to connect the spaces on both axial sides of the rotor part 22.

[0045] In some embodiments, such as Figure 2 and Figure 4 As shown, the first connecting channel 201 extends along the axial direction of the rotor portion 22. In other words, the first connecting channel 201 extends in a straight line, and the direction of extension of the first connecting channel 201 is parallel to the axial direction of the rotor portion 22. The structure of the first connecting channel 201 is simpler, easier to process, and has a shorter extension path, lower internal flow resistance, and a better effect in balancing the pressure difference on both sides of the rotor portion 22 along the axial direction.

[0046] In some embodiments, such as Figures 2-4 As shown, there are multiple first connecting channels 201, and the multiple first connecting channels 201 are evenly spaced along the circumference of the rotor section 22.

[0047] Multiple first connecting channels 201 can increase the total liquid flow and improve the efficiency of balancing pressure difference. Furthermore, the multiple first connecting channels 201 are evenly spaced along the circumference of the rotor section 22, resulting in better overall structural symmetry of the rotor section 22 and better symmetry of liquid flow. This improves the balance of the overall structure and liquid pressure at each connecting channel when the impeller rotor assembly 20 rotates, thereby enhancing the effect of suppressing axial movement of the rotor section 22 and improving noise reduction.

[0048] In some embodiments, such as Figure 3 As shown, the rotor section 22 includes a rotor core 221 and a permanent magnet 222. The permanent magnet 222 passes through the rotor core 221 along the axial direction. The first connecting channel 201 is provided in the rotor core 221 and is staggered from the permanent magnet 222.

[0049] In other words, the first connecting channel 201 is not located in the permanent magnet 222, so it has no effect on the structure of the permanent magnet 222, and thus has little effect on the magnetic circuit of the rotor 22. Furthermore, the liquid is unlikely to come into contact with the permanent magnet 222, thus preventing corrosion of the permanent magnet 222.

[0050] In some specific embodiments, such as Figure 2 and Figure 4 As shown, the rotor section 22 also includes an injection-molded body 223, which encapsulates the rotor core 221 and the permanent magnet 222, ensuring a stable connection between the rotor core 221 and the permanent magnet 222 and preventing corrosion. A first connecting channel 201 may also be located on the portion of the injection-molded body 223 located on both axial sides of the rotor core 221, so that the first connecting channel 201 connects the spaces on both axial sides of the rotor section 22.

[0051] It should be noted that the structure of the permanent magnet 222 corresponding to each magnetic pole can be as follows: Figure 3 The image shows a straight-line permanent magnet, but it can also be a permanent magnet with other structures 222, such as a V-shaped permanent magnet or a U-shaped permanent magnet.

[0052] In some specific embodiments, the first connecting channel 201 can be located between two adjacent magnetic poles in the circumferential direction of the rotor section 22; in the radial direction of the rotor section 22, the first connecting channel 201 can be located radially inside the magnetic pole. This region of the rotor core 221 provides more space for the first connecting channel 201, making it less likely for the first connecting channel 201 to interfere with the permanent magnet 222, thus having less impact on the structural strength of the rotor core 221 and less impact on the magnetic circuit of the rotor section 22.

[0053] According to some embodiments of this utility model, such as Figure 1 , Figure 2 and Figure 4As shown, the impeller rotor assembly 20 also includes a connecting portion 23, which connects the impeller portion 21 and the rotor portion 22. The connecting portion 23 has a cavity 231, which communicates with the flow channel 21 inside the impeller portion 21. A first communication channel 201 connects the cavity 231 and the mounting cavity 101.

[0054] By providing the connecting part 23, the axial relative position of the impeller part 21 and the rotor part 22 can be adjusted, and the cavity 231 can provide space for other structures. The cavity 231 is connected to the flow channel 211 in the impeller part 21, and the first connecting channel 201 connects the cavity 231 and the mounting cavity 101, which can balance the liquid pressure in the flow channel 211, the cavity 231 and the mounting cavity 101 in the impeller part 21, thereby reducing vibration and noise.

[0055] For example, in some embodiments, such as Figure 1 As shown, the electronic water pump 100 also includes a thrust portion and a mounting shaft 30. The mounting shaft 30 is located in the mounting cavity 101 and connected to the housing 10. The rotor portion 22 is rotatably mounted on the mounting shaft 30. The thrust portion is mounted on the housing 10 or the mounting shaft 30. The thrust portion is at least partially located in the cavity 231 and stops the rotor portion 22 on the side facing the impeller portion 21.

[0056] The cavity 231 provides a space for the thrust section, so that the thrust section can cooperate with the rotor section 22 to limit the movement of the rotor section 22. By axially thrusting the rotor section 22 through the thrust section, the axial movement of the rotor section 22 can be limited to a certain extent, thereby further reducing vibration and noise and improving the NVH performance of the electric water pump 100.

[0057] The specific structure of the thrust portion is not limited. For example, the thrust portion can be an arm integrally formed with the pump housing; or, for example, the thrust portion can be a fastener installed on the mounting shaft 30.

[0058] In some specific embodiments, such as Figure 2 and Figure 4 As shown, the injection molded body 223 of the connecting part 23, at least part of the impeller part 21 (such as the lower cover plate and multiple blades of the impeller part 21) and the rotor part 22 can be integrally injection molded. This not only reduces subsequent assembly processes, but also improves the connection reliability of the impeller part 21, the connecting part 23 and the rotor part 22, reduces gaps, and reduces the corrosion risk of the rotor core 221 and the permanent magnet 222.

[0059] In some embodiments, such as Figure 4 and Figure 5 As shown, the connecting part 23 is provided with a second connecting channel 202, which connects the cavity 231 and the mounting cavity 101.

[0060] The cavity 231 is directly connected to the flow channel 211 within the impeller section 21. After being pressurized by the impeller section 21, the liquid can enter the cavity 231, resulting in a higher liquid pressure within the cavity 231. The liquid in the mounting cavity 101 is located between the rotor assembly and the cavity wall of the mounting cavity 101, where the liquid pressure is lower. The second connecting channel 202 connects the cavity 231 and the mounting cavity 101, enabling communication between the high and low pressure regions at the connection point 23, achieving liquid pressure balance and improving noise reduction.

[0061] The extension path of the second connecting channel 202 is not limited; for example, it can extend along a straight line, an arc, or a combination of a straight line and an arc. In some specific embodiments, such as... Figure 4 and Figure 5 As shown, the second connecting channel 202 extends radially along the rotor portion 22. In other words, the second connecting channel 202 extends in a straight line, and the extension direction of the second connecting channel 202 is parallel to the radial direction of the rotor portion 22. The structure of the second connecting channel 202 is simpler, easier to manufacture, and has a shorter extension path, resulting in lower internal flow resistance and better pressure differential balancing. Furthermore, the second connecting channel 202 can achieve liquid pressure differential in different regions radially along the rotor portion 22, thereby suppressing radial oscillation of the rotor portion 22, reducing vibration noise caused by radial oscillation of the rotor portion 22, and improving the NVH performance of the electric water pump 100.

[0062] In some embodiments, such as Figure 4 and Figure 5 As shown, there are multiple second connecting channels 202, and the multiple second connecting channels 202 are evenly spaced along the circumference of the connecting portion 23.

[0063] Multiple second connecting channels 202 can increase the total liquid flow and improve the efficiency of balancing pressure difference. Furthermore, the multiple second connecting channels 202 are evenly spaced along the circumference of the rotor section 22, resulting in better overall structural symmetry of the rotor section 22 and better symmetry of liquid flow. This improves the balance of the overall structure and liquid pressure at each connecting channel when the impeller rotor assembly 20 rotates, thereby enhancing the effect of suppressing radial oscillation of the rotor section 22 and improving noise reduction.

[0064] like Figure 6 As shown, the thermal management system 200 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 200 according to an embodiment of the present invention, by providing an axially penetrating first connecting channel 201 in the rotor portion 22, can balance the liquid pressure difference on both sides of the rotor portion 22 axially, effectively improve the axial movement problem of the rotor portion 22, reduce vibration noise, and improve the NVH performance of the electronic water pump 100.

[0065] The thermal management system 200 can be used to regulate the automotive cabin environment (temperature, humidity, etc.) and the working environment of other components. In some embodiments, the thermal management system 200 mainly includes: valves, heat exchangers, compressors, and pumps, such as an electric water pump 100 or other water pumps. The thermal management system 200 has a circulating working medium, which can be carbon dioxide refrigerant, coolant, etc.

[0066] like Figure 6 As shown, the vehicle 300 according to an embodiment of the present invention includes a thermal management system 200 according to an embodiment of the present invention. Since the thermal management system 200 according to an embodiment of the present invention has the aforementioned beneficial technical effects, the vehicle 300 according to an embodiment of the present invention, by providing an axially penetrating first connecting channel 201 in the rotor portion 22, can balance the liquid pressure difference on both sides of the rotor portion 22 axially, effectively improve the axial movement problem of the rotor portion 22, reduce vibration noise, and improve the NVH performance of the electric water pump 100.

[0067] In this embodiment, vehicle 300 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.

[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 Figure 1 , Figure 4 and Figure 5 As shown, an electronic water pump 100 according to a specific embodiment of the present invention includes a housing 10, an impeller rotor assembly 20, and a stator assembly. The housing 10 includes a casing, a pump housing, and a rear cover. The casing is injection molded to enclose the stator assembly and defines a mounting cavity 101; the pump housing cover is disposed at one axial end of the casing to define a pump chamber 102; the rear cover is disposed at the other axial end of the casing to define a receiving cavity for accommodating control components. The pump housing has an inlet 103 and an outlet.

[0070] The impeller rotor assembly 20 includes an impeller section 21, a connecting section 23, and a rotor section 22 connected sequentially along the axial direction, and the three parts are connected by injection molding. The impeller section 21 is located inside the pump chamber 102 and is used to pressurize the liquid flowing into the pump chamber 102 through the liquid inlet 103; the connecting section 23 and the rotor section 22 are located inside the mounting cavity 101, and a mounting shaft 30 is fixed inside the housing. The rotor section 22 has a mounting hole in the center for assembly with the mounting shaft 30.

[0071] The connecting portion 23 has a cavity 231. A second connecting channel 202 is formed by radially opening holes in the sidewall of the cavity 231. Multiple second connecting channels 202 of the same size are evenly distributed along the circumference of the cavity 231 and are symmetrical about the central axis of the rotor portion 22. The rotor portion 22 has a first connecting channel 201 formed by axially opening holes. The first connecting channel 201 penetrates the entire rotor portion 22, passing through the injection-molded body 223 and the rotor core 221 of the rotor portion 22. Multiple first connecting channels 201 of the same size are evenly distributed along the circumference and are symmetrical about the central axis of the rotor portion 22.

[0072] By opening the first connecting channel 201 and the second connecting channel 202, a liquid internal circulation channel can be formed inside the impeller rotor assembly 20, thereby balancing the axial and radial pressure differences of the rotor section 22, suppressing the axial movement and radial oscillation of the impeller rotor assembly 20, reducing structural vibration and noise, and improving the NVH performance of the electric water pump 100. The first connecting channel 201 and the second connecting channel 202 are of the same size and symmetrical about the central axis of the rotor section 22, ensuring the symmetry of the overall structure and the liquid flow channel. This improves the balance of the overall structure and the liquid pressure at each through-hole when the impeller rotor assembly 20 rotates, thus further suppressing the axial movement and radial oscillation of the impeller rotor assembly 20.

[0073] Other configurations and operations of the electronic water pump 100, thermal management system 200, and vehicle 300 according to embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0074] 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.

[0075] 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.

[0076] 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 in that, include: A housing having a communicating mounting cavity and a pump cavity; An impeller rotor assembly includes an impeller portion and a rotor portion. The impeller portion is located within the pump chamber, and the rotor portion is located within the mounting chamber. One axial end of the rotor portion is connected to the impeller portion. The rotor section is provided with a first connecting channel, which extends through the rotor section axially to connect the spaces on both sides of the rotor section axially.

2. The electronic water pump according to claim 1, characterized in that, The first connecting channel extends along the axial direction of the rotor portion.

3. The electronic water pump according to claim 1, characterized in that, There are multiple first connecting channels, and the multiple first connecting channels are evenly spaced along the circumference of the rotor.

4. The electronic water pump according to claim 1, characterized in that, The rotor section includes a rotor core and a permanent magnet. The permanent magnet passes through the rotor core axially, and the first connecting channel is located in the rotor core and is staggered from the permanent magnet.

5. The electronic water pump according to any one of claims 1-4, characterized in that, The impeller rotor assembly further includes a connecting portion that connects the impeller portion and the rotor portion, and the connecting portion has a cavity that communicates with a flow channel within the impeller portion. The first communication channel communicates the cavity and the mounting cavity.

6. The electronic water pump according to claim 5, characterized in that, The connecting part is provided with a second connecting channel, which connects the cavity and the mounting cavity.

7. The electronic water pump according to claim 6, characterized in that, The second connecting channel extends radially along the rotor portion.

8. The electronic water pump according to claim 6, characterized in that, There are multiple second connecting channels, and these multiple second connecting channels are evenly spaced along the circumference of the connecting portion.

9. The electronic water pump according to claim 5, characterized in that, It also includes a thrust member and a mounting shaft, the mounting shaft being located within the mounting cavity and connected to the housing, the rotor being rotatably mounted on the mounting shaft. The thrust member is mounted on the housing or the mounting shaft, and the thrust member is at least partially located within the cavity and stops the rotor portion on the side facing the impeller portion.

10. A thermal management system, characterized in that, Includes the electronic water pump according to any one of claims 1-9.

11. A vehicle, characterized in that, Includes the thermal management system according to claim 10.

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