Electronic water pump and vehicle thermal management system

Abstract

The utility model provides an electronic water pump and a vehicle thermal management system having the same. The electronic water pump comprises a pump body, a stator assembly and a rotor assembly. The pump body is provided with a rotor containing cavity, and the rotor assembly is rotatably arranged in the rotor containing cavity. And an overflowing gap is formed between the inner wall of the rotor accommodating cavity and the rotor assembly, and is used for limiting one part of the cooling flow channel. A stator assembly surrounds the rotor assembly. The electronic water pump further comprises a flow guide structure, and the flow guide structure and the rotor assembly rotate around the rotating axis together so as to push the fluid medium to flow along the cooling flow channel. The fluid medium flowing in the cooling flow channel takes away heat of the stator assembly and the rotor assembly. When the electronic water pump operates, the flow guide structure can rotate along with the rotor assembly, so that the fluid medium is pushed to flow along the cooling flow channel, and the flow and the flow speed of the fluid medium in the cooling flow channel are improved. The heat exchange efficiency can be improved by increasing the flow and the flow speed, and therefore the heat dissipation performance of the electronic water pump can be improved.

Description

Technical Field

[0001] The present disclosure relates to the field of fluid medium machinery, and in particular, to an electronic water pump and a vehicle thermal management system having the same. Background Art

[0002] Electronic water pumps have many advantages, such as low power consumption, high efficiency, and accurate flow control. Electronic water pumps can be used in automobiles, especially new energy vehicles. For example, electronic water pumps can be used in automotive thermal management systems to drive cooling fluid media to flow in pipelines. Effective heat dissipation during operation has a key impact on the reliability of electronic water pumps. In order to avoid overheating failure, it is necessary to continuously improve the heat dissipation performance of electronic water pumps. Utility Model Content

[0003] In view of this, the present disclosure improves the cooling of the electronic water pump, aiming to improve the problem of poor heat dissipation performance of traditional electronic water pumps.

[0004] On the one hand, the present disclosure provides an electronic water pump. The electronic water pump includes a pump body, a stator assembly and a rotor assembly. The pump body is provided with a rotor receiving chamber, and the rotor assembly is rotatably disposed in the rotor receiving chamber. A flow gap is provided between the inner wall of the rotor receiving chamber and the rotor assembly, and the flow gap defines a part of a cooling channel. The stator assembly surrounds the rotor assembly. The electronic water pump also includes a flow guide structure, which is configured to rotate around a rotation axis together with the rotor assembly to push a fluid medium to flow along the cooling channel.

[0005] The flow gap between the stator assembly and the rotor assembly in the radial direction constitutes a part of the cooling channel. The fluid medium flowing in the cooling channel will take away the heat of the stator assembly and the rotor assembly to achieve the purpose of heat dissipation. When the electronic water pump is running, the guide structure will rotate with the rotor assembly, thereby pushing the fluid medium to flow along the cooling channel and increasing the flow rate and flow velocity of the fluid medium in the cooling channel. The increase in flow rate and flow velocity will help improve the heat exchange efficiency, thereby helping to improve the heat dissipation performance of the electronic water pump.

[0006] As a possible implementation manner, the flow guide structure is in a spiral shape around the rotation axis.

[0007] When rotating with the rotor, the guide structure with this construction can push the fluid medium to advance in a spiral shape along the rotation axis, thereby increasing the flow rate and flow velocity of the fluid medium in the cooling channel, and further improving the heat dissipation performance of the electronic water pump.

[0008] In one example, the flow guiding structure may be a spiral rib extending continuously around the rotation axis.

[0009] In another example, the flow guiding structure may be a spiral groove extending continuously around the rotation axis.

[0010] In another example, the flow guiding structure may be a plurality of protrusions that are distributed at intervals in a spiral shape around the rotation axis.

[0011] The above-mentioned several flow-guiding structures are all in a spiral shape around the rotation axis, and can follow the rotation of the rotor to push the fluid medium to move forward in a spiral shape along the rotation axis.

[0012] As a possible implementation, the electronic water pump further includes an impeller assembly, and the rotor assembly includes a support portion and a rotor core fixed thereto. The impeller assembly is connected to the support portion to rotate around the rotation axis together with the rotor assembly. The flow guide structure is arranged on the outer periphery of the support portion and is axially located between the rotor core and the impeller assembly.

[0013] Since the guide structure is located on the outer periphery of the support part and is axially located between the rotor core and the impeller assembly, when the guide structure rotates with the rotor assembly, the guide structure can more effectively drive the fluid medium from the impeller receiving cavity to the rotor receiving cavity, thereby more effectively improving the flow rate and flow velocity of the fluid medium in the cooling channel.

[0014] As a possible implementation manner, the support portion has a hollow structure, and the cooling channel extends through the interior of the support portion to connect the flow gap and the impeller chamber of the impeller assembly.

[0015] In this way, the fluid medium that completes heat exchange with the rotor assembly and the stator assembly will flow back to the impeller chamber through the interior of the support part. This structure utilizes the internal space of the support part and can help the electronic water pump obtain a more compact structure.

[0016] As a possible implementation, the electronic water pump further includes a pump shaft and a bearing, the support portion surrounds the pump shaft, and the bearing is located between the pump shaft and the support portion. The bearing is provided with a flow groove, and the cooling channel extends through the flow groove and passes through the bearing.

[0017] Due to the presence of the flow groove, the fluid medium flowing along the cooling channel can flow back to the impeller chamber through the bearing without affecting the normal operation of the bearing. At the same time, when flowing through the flow groove, the fluid medium can exchange heat with the bearing, which helps prevent structural deformation caused by overheating of the bearing and improve the transmission efficiency of the bearing.

[0018] As a possible implementation manner, the cooling channel extends from the outer periphery of the impeller assembly to the middle of the impeller assembly through the flow guide structure, the flow gap and the interior of the support portion in sequence.

[0019] In this way, when the electronic water pump is running, the pressure difference generated by the impeller assembly will participate in driving the fluid medium to flow along the cooling channel. At the same time, the flow guide structure will also participate in driving the fluid medium to flow along the cooling channel. Under the joint action of these two aspects of driving, the flow rate and flow velocity of the fluid medium flowing along the cooling channel will be greatly improved, thereby greatly improving the heat dissipation performance of the electronic water pump.

[0020] As a possible implementation, the pump body includes a main body and a front cover, and the main body and the front cover cooperate to define an impeller receiving chamber for receiving the impeller assembly.

[0021] In another aspect, the present disclosure provides a vehicle thermal management system, which includes the above-mentioned electronic water pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] It should be understood that the following drawings only illustrate certain embodiments of the present disclosure and should not be viewed as limiting the scope.

[0023] It should be understood that the same or similar reference numerals are used in the drawings to indicate the same or similar elements.

[0024] It should be understood that the drawings are merely schematic and that the sizes and proportions of elements in the drawings are not necessarily accurate.

[0025] Figure 1 Schematic diagram of the structure of an electronic water pump according to an embodiment of the present disclosure.

[0026] Figure 2 yes Figure 1 Exploded diagram of the electronic water pump.

[0027] Figure 3 yes Figure 1 Schematic cross-sectional view of an electronic cooling water pump in FIG.

[0028] Figure 4 yes Figure 2 Schematic diagram of the structure of the rotor assembly and impeller assembly.

[0029] Figure 5 is along Figure 4 Schematic cross-sectional view of the rotor assembly and impeller assembly in.

[0030] Figure 6 It is a schematic diagram of the structure of the rotor assembly and the impeller assembly according to the modification example 1 of the present disclosure.

[0031] Figure 7 It is a schematic diagram of the structure of the rotor assembly and the impeller assembly according to the second variant of the present disclosure.

[0032] Figure 8It is a schematic diagram of the structure of the rotor assembly and the impeller assembly according to the third variant of the present disclosure. DETAILED DESCRIPTION

[0033] The following is an exemplary description of the embodiments of the present disclosure in conjunction with the accompanying drawings. It should be understood that the present disclosure can be implemented in a variety of ways and should not be construed as being limited to the embodiments described herein, which are only for a more thorough and clear understanding of the present disclosure.

[0034] The present disclosure provides an electronic water pump 100. For example, the electronic water pump 100 can be applied to automobiles, especially new energy vehicles. In particular, the electronic water pump 100 can be applied to automobile thermal management systems. More particularly, the electronic water pump 100 can be used to drive a cooling fluid medium to flow in a pipeline of a thermal management system. It should be understood that the application scenarios mentioned here are exemplary, and the application scenarios of the electronic water pump 100 are not necessarily limited thereto.

[0035] For ease of understanding, the following is an example of the structure of the electronic water pump 100. It should be understood that the structure of the electronic water pump 100 should not be limited to the following description. For example, one or more of the elements cited below can be omitted or replaced, and the layout relationship between them can be replaced.

[0036] refer to Figure 1 and Figure 2 The electronic water pump 100 may include a pump body 10, a stator assembly 20, a rotor assembly 30 and an impeller assembly 40. Figure 3 , a stator receiving chamber 101, a rotor receiving chamber 102 and an impeller receiving chamber 103 may be provided in the pump body 10. The rotor receiving chamber 102 and the impeller receiving chamber 103 may be communicated, and the stator receiving chamber 101 may be separated from the two. The stator assembly 20 may be located in the stator receiving chamber 101 and relatively fixed to the pump body 10. The rotor assembly 30 and the impeller assembly 40 may be respectively arranged in the rotor receiving chamber 102 and the impeller receiving chamber 103. The rotor assembly 30 may be connected to the impeller assembly 40 so that the rotor assembly 30 can rotate with the impeller assembly 40 around a rotation axis AA. For ease of understanding, the rotation axis AA is Figure 3 is schematically shown in FIG.

[0037] The working principle of the electronic water pump 100 provided by the present disclosure may be substantially the same as the working principle of a conventional electronic water pump. For ease of understanding, the working principle of the electronic water pump 100 is briefly described by way of example. Figure 4When the electronic water pump 100 is running, the stator assembly 20 with current flowing through it generates a rotating magnetic field, which acts on the rotor assembly 30 to form a magneto-electrical rotation torque. Under the action of the torque, the rotor assembly 30 rotates with the impeller assembly 40. In this process, under the action of the impeller assembly 40, the fluid medium sucked into the impeller receiving chamber 103 and the rotor receiving chamber 102 will be discharged, thereby achieving the purpose of driving the fluid medium.

[0038] During operation, the stator assembly 20 and the rotor assembly 30 generate heat. If the heat cannot be effectively dissipated, the working performance may be deteriorated or even damaged. To this end, the electronic water pump 100 may be provided with a cooling channel, and a portion of the fluid medium will be introduced into the cooling channel. The fluid medium flows through the cooling channel and will take away the heat generated by the stator assembly 20 and the rotor assembly 30 to achieve the purpose of heat dissipation. For ease of understanding, in Figure 3 In the figure, the cooling channels are shown by a plurality of thick arrows.

[0039] refer to Figure 2 and Figure 3 As a part of the cooling flow channel, a flow gap G may be provided between the inner wall 1021 of the rotor receiving cavity 102 and the rotor assembly 30. Since the stator assembly 20 surrounds the rotor assembly 30 (that is, surrounds the inner wall 1021), the flow gap G is located between the stator assembly 20 and the rotor assembly 30. In this way, when the fluid medium flows through the flow gap G along the cooling flow channel, the heat of the stator assembly 20 and the rotor assembly 30 is taken away, thereby achieving the purpose of heat dissipation.

[0040] The fluid medium flowing along the cooling channel should preferably have sufficient flow rate and flow rate to remove the heat in a timely and effective manner. Figure 2 and Figure 3 , the electronic water pump 100 may further include a flow guiding structure 50. The flow guiding structure 50 may be configured to rotate around the rotation axis AA together with the rotor assembly 30 to push the fluid medium to flow along the cooling channel. Due to the presence of the flow guiding structure 50, when the electronic water pump 100 is running, the flow guiding structure 50 will rotate along with the rotor assembly 30, thereby pushing the fluid medium to flow along the cooling channel, and increasing the flow rate and flow velocity of the fluid medium in the cooling channel. The increase in flow rate and flow velocity will help improve the heat exchange efficiency, thereby helping to improve the heat dissipation performance of the electronic water pump 100.

[0041] The present disclosure does not impose any specific restrictions on the structure of the flow-guiding structure 50. As long as the flow-guiding structure 50 can drive the fluid medium to flow along the cooling channel when rotating together with the rotor assembly 30, it is sufficient.

[0042] As a non-limiting example, refer to Figure 4The flow guide structure 50 may be in a spiral shape around the rotation axis AA. When rotating with the rotor assembly 30, the flow guide structure 50 with such a spiral structure can push the fluid medium to move forward in a spiral shape along the rotation axis AA, thereby increasing the flow rate and flow velocity of the fluid medium in the cooling channel, thereby improving the heat dissipation performance of the electronic water pump 100.

[0043] As a more specific example, let's refer to Figure 4 , the flow guiding structure 50 can be a spiral convex rib 50 extending continuously around the rotation axis AA. The continuously extending spiral convex rib 50 can continuously guide the fluid medium and is relatively easy to implement. Of course, in other examples, the flow guiding structure 50 can have other alternative structures, not limited to the current example. Some alternative structures of the flow guiding structure 50 will be given below and will not be described here.

[0044] The present disclosure does not impose any particular limitation on the connection method between the rotor assembly 30 and the impeller assembly 40, as long as the rotor assembly 30 can rotate with the impeller assembly 40 around the rotation axis AA. Figure 3 and Figure 4 The rotor assembly 30 may include a rotor core 31 and a support portion 32, the rotor core 31 may be fixed on the support portion 32, and the support portion 32 may be formed integrally with the impeller assembly 40, so that the rotor assembly 30 can rotate with the impeller assembly 40. The rotor core 31 may be implemented as a magnet 31 fixed on the support portion 32. A plurality of rotor cores 31 may be distributed at intervals along a direction surrounding the support portion 32.

[0045] It should be noted that the support portion 32 is not necessarily formed integrally with the impeller assembly 40. For example, in other examples of the present disclosure, the rotor assembly 30 and the impeller assembly 40 may be two independent parts, which are connected together in a torque-proof manner so that the rotor assembly 30 can rotate with the impeller assembly 40.

[0046] refer to Figure 3 and 4 The flow guide structure 50 can be arranged at the outer periphery of the support portion 32 and axially located between the rotor core 31 and the impeller assembly 40. Since the flow guide structure 50 is located at the outer periphery of the support portion 32 and axially located between the rotor core 32 and the impeller assembly 40, when the flow guide structure 50 rotates together with the rotor assembly 30, the flow guide structure 50 can more effectively drive the fluid medium from the impeller receiving chamber 103 to the rotor receiving chamber 102, thereby more effectively improving the flow rate and flow velocity of the fluid medium in the cooling flow channel.

[0047] It should be noted that, in the present disclosure, the directional term "axial" may refer to the direction along the rotation axis AA. It should also be noted that, although in the above example, the guide structure 50 is disposed on the outer periphery of the support portion 32 and is axially located between the rotor core 31 and the impeller assembly 40, in other examples of the present disclosure, the guide structure 50 may also be disposed at other positions as long as it can push the fluid medium to flow along the cooling channel.

[0048] refer to Figure 3 and Figure 5 The support portion 32 may have a hollow structure, and the cooling channel may extend through the interior of the support portion 32 to connect the flow gap G and the impeller chamber 41 of the impeller assembly 40. In this way, the fluid medium that completes the heat exchange with the rotor assembly 30 and the stator assembly 20 will flow back to the impeller chamber 41 through the interior of the support portion 32. This structure utilizes the internal space of the support portion 32, which can help the electronic water pump 100 obtain a more compact structure.

[0049] There are many ways to rotatably support the rotor assembly 30 and the impeller assembly 40 in the pump body 10, and the present disclosure does not specifically limit this. As a possible example, continue to refer to Figure 3 and Figure 5 The electronic water pump 100 may further include a pump shaft 60 and a bearing 70. The pump shaft 60 may be fixed to the pump body 10 at least in the axial direction. The support portion 32 may surround the pump shaft 60, and the bearing 70 may be located between the pump shaft 60 and the support portion 32. In this way, through the cooperation of the support portion 32, the pump shaft 60 and the bearing 70, the rotor assembly 30 and the impeller assembly 40 may be rotatably supported in the pump body 10.

[0050] Continue to refer Figure 3 and Figure 5 The bearing 70 may be provided with a flow groove 71, and the cooling channel may extend through the bearing 70 through the flow groove 71. Due to the presence of the flow groove 71, the fluid medium flowing along the cooling channel can flow back to the impeller chamber 41 through the bearing 70 without affecting the normal operation of the bearing 70. At the same time, when flowing through the flow groove 71, the fluid medium can exchange heat with the bearing 70, which helps to prevent the structural deformation caused by overheating of the bearing 70 and improve the transmission efficiency of the bearing 70.

[0051] For example, reference Figure 5 The electronic water pump 100 may include two bearings 70 and may further include a spacer sleeve 80. The two bearings 70 may be spaced apart in the axial direction, and the spacer sleeve 80 may be located in the support portion 32 and between the two bearings 70 to keep the two bearings 32 spaced apart from each other.

[0052] The present disclosure does not impose any particular restrictions on the structure of the cooling channel, as long as it can guide the fluid medium to cool the heat-generating elements such as the stator assembly 30 and the rotor assembly 40. As an example, the cooling channel can extend from the outer periphery of the impeller assembly 40 through the guide structure 50, the flow gap G and the inside of the support portion 32 to the middle of the impeller assembly 40. In this way, when the electronic water pump 100 is running, the pressure difference generated by the impeller assembly 40 will participate in driving the fluid medium to flow along the cooling channel. At the same time, the guide structure 50 will also participate in driving the fluid medium to flow along the cooling channel. Under the combined effect of these two aspects of driving, the flow rate and flow velocity of the fluid medium flowing along the cooling channel will be greatly improved, thereby improving the heat dissipation performance of the electronic water pump 100 to a large extent.

[0053] The present disclosure does not impose any particular limitation on the structure of the pump body 10, as long as it can accommodate and support the stator assembly 20, the rotor assembly 30 and the impeller assembly 40. As an example, return to Figure 1 and Figure 2 The pump body 10 may include a main body 11, a front cover 12 and a rear cover 13. The front cover 12 may be covered at the front end of the main body 11 to cooperate with the main body 11 to form a rotor receiving chamber 102 and an impeller receiving chamber 103. The rear shell 13 may be covered at the rear end of the main body 11 to cooperate with the main body 11 to form a stator receiving chamber 101 for accommodating the stator assembly 20.

[0054] In addition to the elements described above, refer to Figure 3 The electronic water pump 100 may further include a driving circuit board 90, and the driving circuit board 90 may be disposed in the stator receiving cavity 101. In this way, the heat generated by the driving circuit board 90 during operation will also be taken away by the fluid medium flowing through the cooling channel.

[0055] Combination of the above Figures 1 to 5 , an electronic water pump 100 according to an embodiment of the present disclosure is described. It is understandable that the above description of the electronic water pump 100 is only exemplary. Therefore, the electronic water pump 100 provided by the present disclosure should not be understood as being limited to the above description. To illustrate this point, the following is combined with Figures 6 to 8 , possible variations of the electronic water pump 100 are given.

[0056] Before introducing these variations, it should be noted that the embodiments described above and the variations to be described below involve some identical or corresponding elements. For the purpose of brevity, identical or corresponding elements will be denoted by the same reference numerals to appropriately omit repeated descriptions.

[0057] refer to Figure 6In the modification 1 of the present disclosure, the flow guide structure 50 is also in a spiral shape around the rotation axis AA, but the flow guide structure 50 is not a spiral rib, but a spiral groove 50 extending continuously around the rotation axis AA. This spiral groove 50 is also in a spiral shape around the rotation axis AA, and can also follow the rotation of the rotor assembly to push the fluid medium to advance in a spiral shape along the rotation axis AA.

[0058] refer to Figure 7 In the second modification of the present disclosure, the flow guide structure 50 is also in a spiral shape around the rotation axis AA, but the flow guide structure 50 is not a continuous rib, but a plurality of protrusions 50 distributed in a spiral shape around the rotation axis AA. The plurality of protrusions 50 are also in a spiral shape around the rotation axis AA as a whole, and can also follow the rotation of the rotor assembly 30 to push the fluid medium to advance in a spiral shape along the rotation axis AA.

[0059] It should be noted that, although in the aforementioned examples, the flow guiding structure 50 is in a spiral shape around the rotation axis AA, in other examples of the present disclosure, the flow guiding structure 50 may also have other structures, as long as the flow guiding structure 50 can push the fluid medium to flow along the cooling channel. Below, a flow guiding structure 50 with other structures is provided.

[0060] refer to Figure 8 In the modification 3 of the present disclosure, the flow guide structure 50 is implemented as a plurality of blades 50, and the plurality of blades 50 extend in a direction around the rotation axis AA. When the rotor assembly 30 rotates, the plurality of blades 50 will push the fluid medium forward along the rotation axis AA to increase the flow velocity and flow rate of the fluid medium in the cooling channel.

[0061] The present disclosure also provides a vehicle thermal management system, which may include the electronic water pump 100 provided by the present disclosure.

[0062] The basic principles of the present disclosure are described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, effects, etc. mentioned in the present disclosure are only examples and not limitations, and it cannot be considered that these advantages, strengths, effects, etc. are required by each embodiment of the present disclosure. In addition, the specific details disclosed above are only for the purpose of illustration and ease of understanding, and are not limiting. The above details do not limit the present disclosure to the necessity of adopting the above specific details to be implemented.

[0063] The above description has been given for the purpose of illustration and description. In addition, this description is not intended to limit the embodiments of the present disclosure to the forms disclosed herein. Although multiple example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, changes, additions and sub-combinations thereof.

[0064] The components and devices involved in this disclosure are only illustrative examples and are not intended to require or imply that they must be connected, arranged, and configured in the manner shown in the drawings. As those skilled in the art will recognize, these components and devices can be connected, arranged, and configured in any manner.

[0065] The above are only specific embodiments of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present disclosure, which should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. An electronic water pump, comprising a pump body, a stator assembly and a rotor assembly, wherein the pump body is provided with a rotor receiving chamber, the rotor assembly is rotatably disposed in the rotor receiving chamber, a flow gap is provided between the inner wall of the rotor receiving chamber and the rotor assembly, the flow gap defines a part of a cooling flow channel, the stator assembly surrounds the rotor assembly, and is characterized in that: The electronic water pump further includes a flow guiding structure, which is configured to rotate together with the rotor assembly around a rotation axis to push the fluid medium to flow along the cooling channel.

2. The electronic water pump according to claim 1, characterized in that: The flow guiding structure is in a spiral shape surrounding the rotation axis.

3. The electronic water pump according to claim 2, characterized in that: The flow guiding structure is a spiral convex rib extending continuously around the rotation axis.

4. The electronic water pump according to claim 2, characterized in that: The flow guiding structure is a plurality of protrusions which are distributed in a spiral shape and at intervals around the rotation axis.

5. The electronic water pump according to any one of claims 1 to 4, characterized in that: It also includes an impeller assembly, the rotor assembly includes a support portion and a rotor core fixed thereto, the impeller assembly is connected to the support portion to rotate around the rotation axis together with the rotor assembly, and the guide structure is arranged on the outer periphery of the support portion and is axially located between the rotor core and the impeller assembly.

6. The electronic water pump according to claim 5, characterized in that: The support portion has a hollow structure, and the cooling channel extends through the interior of the support portion to communicate with the flow gap and the impeller chamber of the impeller assembly.

7. The electronic water pump according to claim 6, characterized in that: It also includes a pump shaft and a bearing. The support portion surrounds the pump shaft. The bearing is located between the pump shaft and the support portion. The bearing is provided with a flow groove. The cooling channel extends through the bearing via the flow groove.

8. The electronic water pump according to claim 6, characterized in that: The cooling channel extends from the outer periphery of the impeller assembly to the middle of the impeller assembly through the flow guide structure, the flow gap and the interior of the support portion in sequence.

9. The electronic water pump according to claim 5, characterized in that: It also includes a front cover, which cooperates with the pump body to define an impeller accommodating chamber for accommodating the impeller assembly.

10. A vehicle thermal management system, characterized in that: It comprises the electronic water pump according to any one of claims 1 to 9.

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