Electronic water pump, thermal management system with same and vehicle

Abstract

The utility model discloses an electronic water pump, a heat management system with the electronic water pump and a vehicle, and the electronic water pump comprises a machine shell, a first water pump and a second water pump, the pump cover is internally provided with a second mounting cavity, and the second mounting cavity is provided with a medium inlet and a medium outlet; an impeller; the motor comprises a stator assembly and a rotor assembly; the heat dissipation plate is connected with the machine shell in a sealed mode; the controller is in heat conduction fit with the heat dissipation plate; one axial end of the supporting shaft is matched with the pump cover, at least one of the machine shell, the heat dissipation plate and the stator assembly is matched with the other axial end of the supporting shaft, and a first communication channel is formed in the supporting shaft. According to the electronic water pump, liquid in the electronic water pump can circularly flow in the first mounting cavity, the second mounting cavity and the first communication channel so as to take away heat on the heat dissipation plate, heat dissipation of the controller is achieved, heat dissipation does not depend on a machine shell, the material of the machine shell is not limited, and cost can be reduced conveniently.

Description

TECHNICAL FIELD

[0001] The utility model relates to water pump technical field, specifically, relate to an electronic water pump and have its heat management system, vehicle. BACKGROUND

[0002] The electronic water pump in the prior art relies on the shell to dissipate heat, if the shell is a plastic part, the heat dissipation effect is poor, if the shell is a metal part, although the heat dissipation effect is improved, but the structure weight is larger, and the cost is higher. UTILITY MODEL CONTENTS

[0003] The utility model aims at least to solve one of the prior art technical problems existing in the prior art. For this purpose, the utility model provides an electronic water pump, liquid in the electronic water pump can circulate and flow in the first installation cavity, the second installation cavity and the first communication channel, the liquid circulation flow can take away the heat on the heat dissipation plate, realize the heat dissipation of the controller, so as to no longer rely on the shell to dissipate heat, improve the heat dissipation effect, and the material of the shell is not limited, which facilitates reducing the cost.

[0004] The utility model further provides a heat management system with the electronic water pump.

[0005] The utility model further provides a vehicle with the heat management system.

[0006] According to the electronic water pump of the utility model first aspect embodiment, including: casing, the first installation cavity is arranged in the casing;Pump cover, the pump cover is arranged on the axial one end of the casing, and the second installation cavity is arranged in the pump cover, and the axial one end of the first installation cavity is communicated with the second installation cavity, and the second installation cavity has medium inlet and medium outlet;Impeller, the impeller is rotatably arranged in the second installation cavity;Motor, the motor includes the stator assembly and the rotor assembly of inner and outer sleeve, the casing covers the stator assembly, so that the stator assembly is fixedly arranged on the casing, and the rotor assembly is arranged in the first installation cavity and is fixedly connected with the impeller;Heat dissipation plate, the heat dissipation plate is arranged on the axial other end of the casing, and is sealingly connected with the casing;Controller, the controller is arranged on the side of the heat dissipation plate away from the first installation cavity, and is in heat-conducting cooperation with the heat dissipation plate;Support shaft, the support shaft is arranged in the rotor assembly and is rotatably connected with the rotor assembly, the axial one end of the support shaft is matched with the pump cover, and the axial other end of the support shaft is matched with at least one of the casing, the heat dissipation plate and the stator assembly, and the first communication channel is formed in the support shaft to communicate the axial other end of the first installation cavity and the second installation cavity, and the communication position of the first installation cavity and the second installation cavity is located on the radial outer side of the first communication channel.

[0007] The liquid in the electronic water pump can circulate in the first mounting cavity, the second mounting cavity and the first communication channel, and the liquid can take away the heat on the heat dissipation plate when circulating, thereby achieving heat dissipation of the controller, so that the heat dissipation is no longer relied on the shell, the heat dissipation effect is improved, and the material of the shell is not limited, thereby conveniently reducing the cost.

[0008] In addition, the electronic water pump according to the above-mentioned embodiments of the utility model can further have the following additional technical features.

[0009] According to some embodiments of the utility model, the heat dissipation plate is injection molded with the shell, the support shaft is arranged in a spaced manner with the shell, and the support shaft is fixedly assembled with the heat dissipation plate.

[0010] According to some optional embodiments of the utility model, the edge of the heat dissipation plate is formed with a plurality of through holes arranged in a spaced manner in the circumferential direction, the shell comprises a first part and a second part integrally injection molded, the first part is injection molded with the hole wall of the through hole, and the second part wraps the edge of the heat dissipation plate and is connected to the axial two ends of the first part.

[0011] According to some specific embodiments of the utility model, the edge of the heat dissipation plate is formed with a plurality of through holes and a plurality of weight reduction grooves, each through hole is formed on the outer side corresponding to the weight reduction groove and penetrates the groove wall of the weight reduction groove.

[0012] According to some optional embodiments of the utility model, a first glue groove is defined between the heat dissipation plate and the shell, the first glue groove is provided with a glue sealing element.

[0013] According to some optional embodiments of the utility model, the heat dissipation plate comprises a plate body part and a support part, the support part is arranged on the side of the plate body part facing the first mounting cavity, and the support part is formed with a plug-in groove matched with the support shaft, the second communication channel comprises a communication groove and a communication hole in communication, the communication groove is formed on the bottom wall of the plug-in groove and is in communication with the first communication channel, and the communication hole is formed on the circumferential wall of the support part and penetrates the inner circumferential wall and the outer circumferential wall of the support part.

[0014] According to some optional embodiments of the utility model, the heat dissipation plate includes a plate body part and a plurality of heat dissipation fins, the plurality of heat dissipation fins are arranged on the side of the plate body part facing the first mounting cavity, and the plurality of heat dissipation fins are arranged on the outer circumferential side of the support shaft at intervals in the circumferential direction, and each heat dissipation fin extends linearly or curvilinearly in the radial direction.

[0015] According to some optional embodiments of the utility model, the heat dissipation plate includes a plate body part, a support part and a plurality of heat dissipation fins, the support part and the plurality of heat dissipation fins are arranged on the side of the plate body part facing the first mounting cavity, the plurality of heat dissipation fins are arranged on the outer circumferential side of the support part at intervals in the circumferential direction, each heat dissipation fin extends in the radial direction, the second communication passage includes a communication groove and a communication hole, the communication groove is formed in the support part and communicates with the first communication passage, the communication hole is formed on the circumferential wall of the support part and penetrates the inner circumferential wall and the outer circumferential wall of the support part, the support part is formed in a closed ring shape, the central axis of the communication hole is arranged obliquely relative to the central axis of the support shaft, and the central axis of the communication hole extends outward in the radial direction to the side of the heat dissipation fin facing the first mounting cavity, or the support part includes a plurality of arc-shaped matching parts arranged at intervals in the circumferential direction, and the communication hole is formed between two adjacent arc-shaped matching parts.

[0016] According to some embodiments of the utility model, the pump cover includes a cover body and a second bracket, the medium inlet and the medium outlet are formed on the cover body, the second bracket is arranged at the medium inlet and is inserted and matched with the support shaft, a flow control hole communicating the medium inlet and the first communication passage is formed on the second bracket, the opening area of the flow control hole is smaller than the flow area of the first communication passage, and the communication position of the first mounting cavity and the second mounting cavity is adjacent to the medium outlet in the radial direction.

[0017] According to some embodiments of the utility model, a bearing is arranged between the support shaft and the rotor assembly, the support shaft includes a first shaft segment, a second shaft segment and a third shaft segment arranged in sequence in the axial direction, the first shaft segment and the third shaft segment are respectively rotationally matched with the bearing, and the outer circumferential wall of the second shaft segment is arranged in a recessed manner relative to the first shaft segment and the third shaft segment.

[0018] According to some embodiments of the utility model, the rotor assembly includes rotor core, rotor insulation and multiple permanent magnets, multiple permanent magnets are arranged in the rotor core in circumferential direction interval, and the rotor insulation injection moulded package rotor core and permanent magnet and injection moulded connection rotor core and permanent magnet, the outer peripheral wall of rotor core exposes in rotor insulation, the impeller and the rotor insulation are integral injection moulded piece, the impeller includes first end plate, second end plate and multiple blades between first end plate and second end plate, the second end plate forms impeller import opposite with medium import, the radial outer end of first end plate and the radial outer end of second end plate form gap between the impeller export, the axial dimension of impeller export is H, the axial dimension of the end face of first end plate towards second end plate is Y1, the axial dimension of the end face of second end plate towards first end plate is Y2, H is greater than or equal to Y1, and H is greater than or equal to Y2.

[0019] According to some embodiments of the utility model, the controller includes circuit board and electronic device, the circuit board is equipped with heat-conducting adhesive between the heat dissipation plate, all the electronic devices are arranged on the side of the circuit board away from the heat dissipation plate, the second connecting structure is integrally arranged on the shell, the second connecting structure is arranged on the outer circumferential side of the heat dissipation plate and is arranged on the circuit board, and the second connecting structure is hot riveted on the circuit board;And / or, the electronic water pump further includes a connecting terminal, the connecting terminal is a sheet structure and includes a connecting portion and multiple head portions, multiple head portions are arranged on one end of the length of the connecting portion in the width direction of the connecting portion, and are inserted into the same insertion hole on the circuit board, each head portion forms an elastic hole, the width of the head portion increases first and then decreases along the length direction of the connecting portion, and the thickness of the connecting terminal is greater than or equal to 0.8mm.

[0020] According to some embodiments of the present application, the electronic water pump further comprises: a rear cover, the rear cover is arranged at one end of the shell away from the pump cover, and a third mounting cavity is defined by the shell, the heat sink and the rear cover, the controller is arranged in the third mounting cavity, and the rear cover is configured to satisfy at least one of the following conditions: condition A1, an inner wall surface of the rear cover opposite to the controller is provided with a reinforcing structure, the reinforcing structure comprises a plurality of first ribs arranged at intervals in a first direction and a plurality of second ribs arranged at intervals in a second direction, each of the first ribs extends linearly in the second direction, each of the second ribs extends linearly in the first direction, the first ribs and the second ribs are arranged to intersect, and the first direction and the second direction are perpendicular to the axial direction of the support shaft; condition A2, a connection terminal is arranged on the controller, the connection terminal penetrates through the rear cover and is injection-molded with the rear cover, a second glue groove is formed in the inner wall surface and / or the outer wall surface of the rear cover, the second glue groove is arranged around the connection terminal, and a glue sealing element is arranged in the second glue groove; condition A3, the rear cover is fixedly connected with the shell by welding, and a welding positioning hole is arranged in the outer peripheral wall of the rear cover; and condition A4, the rear cover comprises a surrounding plate and a bottom plate, the surrounding plate surrounds the outer periphery of the bottom plate and is fixed with the shell, the bottom plate comprises a first wall portion and a second wall portion arranged opposite in the first direction, in the axial direction of the support shaft, the distance between the first wall portion and the shell is less than the distance between the second wall portion and the shell, a connection terminal is arranged on the controller, and the connection terminal is arranged in the first wall portion, and the first direction is perpendicular to the axial direction of the support shaft.

[0021] According to some embodiments of the present application, the stator assembly comprises a stator core, an insulation support and a stator winding, the insulation support is an injection-molded part and injection-molded around the stator core, and the stator winding is mounted on the insulation support.

[0022] According to the second aspect of the present application, a heat management system is provided, which comprises the electronic water pump according to the first aspect of the present application.

[0023] According to the heat management system of the present application, the liquid in the electronic water pump according to the first aspect of the present application can circulate in the first mounting cavity, the second mounting cavity and the first communication channel, and the liquid circulation can carry away the heat on the heat sink to achieve heat dissipation of the controller, so that the heat dissipation is no longer dependent on the shell, the heat dissipation effect is improved, and the material of the shell is not limited, thereby reducing the cost.

[0024] According to a third aspect of the present application, a vehicle is provided, which comprises the electronic water pump according to the first aspect of the present application or the thermal management system according to the second aspect of the present application.

[0025] According to the vehicle of the present application, the liquid in the thermal management system according to the second aspect of the present application can circulate in the first installation cavity, the second installation cavity and the first communication channel, and the liquid can take away the heat on the heat dissipation plate when circulating, thereby achieving heat dissipation of the controller. In this way, the heat dissipation is no longer dependent on the shell, the heat dissipation effect is improved, and the material of the shell is not limited, thereby facilitating cost reduction.

[0026] The additional aspects and advantages of the present application will be partially given in the following description, partially will become obvious from the following description, or will be understood by the practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0027] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:

[0028] Figure 1 is a structural schematic view of the electronic water pump according to some embodiments of the present application;

[0029] Figure 2 is a sectional view of the electronic water pump according to some embodiments of the present application;

[0030] Figure 3 is a structural schematic view of the heat dissipation plate according to some embodiments of the present application;

[0031] Figure 4 is a structural schematic view of the heat dissipation plate according to some embodiments of the present application;

[0032] Figure 5 is a sectional view of the heat dissipation plate according to some embodiments of the present application;

[0033] Figure 6 is a sectional view of the electronic water pump according to some other embodiments of the present application;

[0034] Figure 7 is a structural schematic view of the heat dissipation plate according to some other embodiments of the present application;

[0035] Figure 8 is a structural schematic view of the heat dissipation plate according to some other embodiments of the present application;

[0036] Figure 9 is a structural schematic view of the heat dissipation plate according to some other embodiments of the present application;

[0037] Figure 10 is a partial structure sectional view of an electronic water pump according to another embodiment of the present utility model;

[0038] Figure 11 is a partial structure sectional view of an electronic water pump according to another embodiment of the present utility model;

[0039] Figure 12 is a structure sectional view of an electronic water pump according to an embodiment of the present utility model;

[0040] Figure 13 is a schematic view of a support shaft, a first support and other structures of an electronic water pump according to an embodiment of the present utility model;

[0041] Figure 14 is a schematic view of a support shaft, a first support and other structures of an electronic water pump according to an embodiment of the present utility model;

[0042] Figure 15 is a structure schematic view of a support shaft according to an embodiment of the present utility model;

[0043] Figure 16 is a structure schematic view of an impeller and a rotor assembly according to an embodiment of the present utility model;

[0044] Figure 17 is a structure schematic view of a circuit board according to an embodiment of the present utility model;

[0045] Figure 18 is a structure schematic view of a rear cover according to an embodiment of the present utility model;

[0046] Figure 19 is a structure schematic view of a rear cover according to an embodiment of the present utility model;

[0047] Figure 20 is a structure schematic view of a connecting terminal according to an embodiment of the present utility model;

[0048] Figure 21 is a structure schematic view of a vehicle according to an embodiment of the present utility model.

[0049] Reference signs: 1000, vehicle; 1, electronic water pump;

[0050] 10, casing; 11, first mounting cavity; 13, second connecting structure; 14, recessed portion;

[0051] 20, pump cover; 21, cover main body; 211, medium inlet; 212, medium outlet; 213, second mounting cavity; 22, second support; 221, flow control hole;

[0052] 30. Impeller; 31. First end plate; 32. Second end plate; 321. Impeller inlet; 33. Blade; 34. Impeller outlet;

[0053] 40. Motor; 41. Stator assembly; 411. Stator core; 4111. Stator teeth; 412. Insulating support; 413. Stator winding; 42. Rotor assembly; 421. Rotor core; 422. Rotor insulator; 423. Permanent magnet;

[0054] 50. Heat sink; 501. Plate body; 502. Support part; 5021. Insertion slot; 503. Heat sink fins; 504. Flow channel; 51. Second connecting channel; 511. Connecting groove; 512. Connecting hole; 52. Through hole; 53. Weight reduction groove; 54. First glue groove; 55. First connecting hole;

[0055] 61. Circuit board; 611. Second connecting hole; 612. Mating hole;

[0056] 70. Support shaft; 701. First shaft segment; 702. Second shaft segment; 703. Third shaft segment; 71. First connecting channel;

[0057] 80. First bracket; 81. First connector; 82. Second connector;

[0058] 91. Seal; 92. Bearing; 93. Connecting terminal; 931. Connecting part; 932. Head; 933. Resilient hole;

[0059] 94. Rear cover; 941. Third mounting cavity; 942. Second glue groove; 943. Welding positioning hole; 945. Enclosure plate; 946. Base plate; 9461. First wall section; 9462. Second wall section;

[0060] 95. Strengthen the structure; 951. First stiffener; 952. Second stiffener. Detailed Implementation

[0061] 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.

[0062] The electronic water pump 1 according to an embodiment of the present invention is described below with reference to the accompanying drawings.

[0063] like Figures 1-6 As shown, the electronic water pump 1 according to an embodiment of the present invention includes a housing 10, a pump cover 20, an impeller 30, a motor 40, a heat sink 50, a controller, and a support shaft 70.

[0064] The casing 10 has a first mounting cavity 11 therein, the pump cover 20 is arranged at one axial end of the casing 10, the pump cover 20 has a second mounting cavity 213 therein, one axial end of the first mounting cavity 11 is communicated with the second mounting cavity 213, the second mounting cavity 213 has a medium inlet 211 and a medium outlet 212, the impeller 30 is rotatably arranged in the second mounting cavity 213, the motor 40 comprises a stator assembly 41 and a rotor assembly 42 which are arranged in a sleeving manner, the casing 10 covers the stator assembly 41 so that the stator assembly 41 is fixedly arranged on the casing 10, and the rotor assembly 42 is arranged in the first mounting cavity 11 and fixedly connected with the impeller 30.

[0065] When the rotor assembly 42 is driven to rotate, the rotor assembly 42 drives the impeller 30 to rotate, and the impeller 30 drives the liquid to flow into the second mounting cavity 213 from the medium inlet 211, and the liquid in the second mounting cavity 213 flows out from the medium outlet 212, so as to drive the liquid to the designated position.

[0066] The heat dissipation plate 50 is arranged at the other axial end of the casing 10 and is sealingly connected with the casing 10, the controller is arranged on the side of the heat dissipation plate 50 which is away from the first mounting cavity 11, the controller is in heat conduction cooperation with the heat dissipation plate 50, so that the heat dissipation plate 50 is used to dissipate the heat on the controller, thereby preventing the temperature of the controller from being too high and affecting the working efficiency of the controller.

[0067] In addition, the heat dissipation plate 50 is sealingly connected with the casing 10, so that the liquid can be prevented from flowing to the controller and being in contact with the controller, thereby protecting the controller and reducing the probability of failure of the controller.

[0068] The support shaft 70 is arranged in the rotor assembly 42 and is in rotation cooperation with the rotor assembly 42, the support shaft 70 can support the rotation of the rotor assembly 42 and limit the shaking amplitude of the rotor assembly 42, so as to ensure the stable rotation of the rotor assembly 42.

[0069] One axial end of the support shaft 70 is in cooperation with the pump cover 20, and at least one of the casing 10, the heat dissipation plate 50 and the stator assembly 41 is in cooperation with the other axial end of the support shaft 70, so as to fix the position of the support shaft 70 from both axial ends of the support shaft 70, thereby stably arranging the support shaft 70 in the rotor assembly 42, enabling the support shaft 70 to bear the acting force of the rotor assembly 42, and thereby enabling the support shaft 70 to stably support the rotation of the rotor assembly 42 and limit the shaking amplitude of the rotor assembly 42.

[0070] Specifically, one axial end of the support shaft 70 is fixedly connected with the pump cover 20, and at least one of the casing 10, the heat sink 50 and the stator assembly 41 is fixedly connected with the other axial end of the support shaft 70, so as to fix the position of the support shaft 70, prevent the support shaft 70 from rotating with the rotor assembly 42, and enable the support shaft 70 to support the rotation of the rotor assembly 42 and limit the swing range of the rotor assembly 42.

[0071] The fixed connection of the one axial end of the support shaft 70 with the pump cover 20 can be detachable or integral, and the fixed connection of the other axial end of the support shaft 70 with at least one of the casing 10, the heat sink 50 and the stator assembly 41 can be detachable or integral, which is not limited here.

[0072] The first communication channel 71 is formed on the support shaft 70, and the first communication channel 71 communicates the other axial end of the first installation cavity 11 with the second installation cavity 213, so as to enable the liquid to flow in the second installation cavity 213 and the other end of the first installation cavity 11, to take away the heat on the heat sink 50 and the heat in the first installation cavity 11, to achieve sufficient heat dissipation of the controller and the second installation cavity 11, and to reduce the influence of heat on the working efficiency of the controller.

[0073] The communication position of the first installation cavity 11 and the second installation cavity 213 is located radially outside the first communication channel 71, so as to arrange the communication position of the first installation cavity 11 and the second installation cavity 213 and the first communication channel 71 in the radial direction, and to enable the liquid at the communication position of the first installation cavity 11 and the second installation cavity 213 to smoothly enter the first communication channel 71, to achieve the circulation of the liquid.

[0074] Specifically, in some embodiments, when the rotor assembly 42 drives the impeller 30 to rotate, the liquid entering the second installation cavity 213 from the medium inlet 211 flows to the designated area from the medium outlet 212, and part of the liquid can flow to the first installation cavity 11 and flow to the heat sink 50 at the other axial end of the first installation cavity 11 through the gap between the rotor assembly 42 and the stator assembly 41, and then flow to the second installation cavity 213 through the first communication channel 71. When the liquid flows through the heat sink 50, the heat on the heat sink 50 can be taken away, and the effective heat dissipation of the controller and the first installation cavity 11 can be achieved.

[0075] In some embodiments, when the rotor assembly 42 drives the impeller 30 to rotate, the liquid entering the second installation cavity 213 from the medium inlet 211 flows to the designated area from the medium outlet 212, and part of the liquid flows to the heat sink 50 at the other end of the first installation cavity 11 through the first communication channel 71, and then flows to the second installation cavity 213 along the gap between the rotor assembly 42 and the stator assembly 41. When the liquid flows through the heat sink 50, the heat on the heat sink 50 can be taken away, thereby achieving effective heat dissipation of the controller and the first installation cavity 11.

[0076] Therefore, the liquid in the electronic water pump 1 according to the embodiments of the present application can circulate in the first installation cavity 11, the second installation cavity 213 and the first communication channel 71, and the heat on the heat sink 50 can be taken away when the liquid circulates, thereby achieving heat dissipation of the controller. In this way, the heat dissipation is no longer relied on the shell 10, the heat dissipation effect is improved, and the material of the shell 10 is not limited, thereby facilitating cost reduction.

[0077] The electronic water pump 1 according to the embodiments of the present application will be described below with reference to the accompanying drawings.

[0078] In some embodiments of the present application, as shown in Figures 1-6 The electronic water pump 1 comprises a shell 10, a pump cover 20, an impeller 30, a motor 40, a heat sink 50, a controller and a support shaft 70.

[0079] In some embodiments of the present application, as shown in Figure 1 , Figure 2 The impeller 30 is a centrifugal wheel, the medium inlet 211 is located at one end of the impeller 30 in the axial direction, and the medium outlet 212 is located at one side of the impeller 30 in the circumferential direction. The rotation of the impeller 30 drives the liquid to enter the second installation cavity 213 from the medium inlet 211, and drives the liquid in the second installation cavity 213 to flow out from the medium outlet 212. Therefore, a negative pressure is formed between the medium inlet 211 and the medium outlet 212. Specifically, the pressure at the medium outlet 212 is larger, and the pressure at the medium inlet 211 is smaller.

[0080] The gap between the rotor assembly 42 and the stator assembly 41 is close to the medium outlet 212. Therefore, under the action of the pressure, the liquid close to the medium outlet 212 in the second installation cavity 213 flows to the end of the first installation cavity 11 through the gap between the rotor assembly 42 and the stator assembly 41, and then flows to the heat sink 50. After flowing through the heat sink 50 and taking away the heat on the heat sink 50, the liquid at the end of the first installation cavity 11 flows to the second installation cavity 213 through the first communication channel 71, so that the liquid can circulate in the second installation cavity 213 and the first installation cavity 11, thereby taking away the heat on the heat sink 50 and cooling the heat sink 50 and the controller.

[0081] In some embodiments, the heat dissipation plate 50 and the controller are cooled in this way, and the cooling effect is good, so that the electronic water pump 1 can be stably operated at an ambient temperature of 135 DEG C and a medium temperature of 120 DEG C.

[0082] In some embodiments of the utility model, as shown in Figure 2 The heat dissipation plate 50 is injection molded with the shell 10, so that the heat dissipation plate 50 and the shell 10 can be conveniently and tightly connected together, and the sealing strength is good, so that the liquid in the second mounting cavity 213 cannot flow to the controller, and the controller cannot be in contact with the liquid.

[0083] The support shaft 70 is spaced apart from the shell 10, the support shaft 70 is assembled and fixed with the heat dissipation plate 50, the heat dissipation plate 50 is formed with a second communication channel 51 communicating the first mounting cavity 11 and the first communication channel 71, so that the other end of the first mounting cavity 11 and the second mounting cavity 213 are communicated by the first communication channel 71 and the second communication channel 51, and the liquid can circulate between the second mounting cavity 213 and the first mounting cavity 11, thereby taking away the heat on the heat dissipation plate 50.

[0084] The support shaft 70 is spaced apart from the shell 10, only the heat dissipation plate 50 is used to fix the other end of the support shaft 70 in the axial direction, so as to facilitate reducing the assembly difficulty, specifically, the shell 10 and the heat dissipation plate 50 are connected by injection molding, if the other end of the support shaft 70 in the axial direction is assembled and fixed with the heat dissipation plate 50, the support shaft 70 also has an assembly relationship between the shell 10, which requires higher assembly precision and greater assembly difficulty, the present scheme makes the support shaft 70 spaced apart from the shell 10, only the heat dissipation plate 50 is used to fix the other end of the support shaft 70 in the axial direction, so as to facilitate reducing the assembly difficulty and improving the assembly efficiency.

[0085] In some optional embodiments of the utility model, as shown in Figure 3 The edge of the heat dissipation plate 50 is formed with a plurality of through holes 52 spaced apart in the circumferential direction, the shell 10 comprises a first part and a second part which are integrally injection molded, the first part is injection molded with the hole wall of the through hole 52, and the second part wraps the edge of the heat dissipation plate 50 and is connected to the axial two ends of the first part, so as to increase the connection area of the heat dissipation plate 50 and the shell 10, thereby increasing the strength of the injection molding connection between the heat dissipation plate 50 and the shell 10, so that the heat dissipation plate 50 is not easy to separate from the shell 10.

[0086] Specifically, when the casing 10 is formed by injection molding and the casing 10 and the heat dissipation plate 50 are connected by injection molding, the heat dissipation plate 50 needs to be placed in the mold, and then the injection molding liquid is poured into the mold, part of the injection molding liquid is located in the through hole 52, and forms a first part, part of the injection molding liquid surrounds the edge of the heat dissipation plate 50 and connects the two ends of the first part in the axial direction of the through hole 52 to form an annular structure located in the through hole 52, and a plurality of annular structures are arranged and connected along the circumferential direction of the heat dissipation plate 50, thereby being capable of fully connecting the casing 10 and the heat dissipation plate 50 and improving the connection strength of the casing 10 and the heat dissipation plate 50.

[0087] In some optional embodiments of the utility model, as shown in Figure 3 The edge of the heat dissipation plate 50 is formed with a plurality of weight reduction grooves 53 arranged at intervals in the circumferential direction, the weight reduction grooves 53 are arranged, on the one hand, to reduce the weight of the heat dissipation plate 50, facilitating the lightweight design of the electronic water pump 1, and on the other hand, to improve the structural strength of the heat dissipation plate 50, so that the heat dissipation plate 50 can better and more stably fix and support the other end of the shaft 70.

[0088] The casing 10 wraps the edge of the heat dissipation plate 50 and is connected to the groove wall of the weight reduction groove 53 by injection molding, so that the connection area of the casing 10 and the heat dissipation plate 50 can be increased, thereby improving the connection strength of the heat dissipation plate 50 and the casing 10 to firmly and sealingly connect the heat dissipation plate 50 and the casing 10 together.

[0089] In some specific embodiments of the utility model, as shown in Figure 3 The edge of the heat dissipation plate 50 is formed with a plurality of through holes 52 and a plurality of weight reduction grooves 53, each through hole 52 is formed on the outer side of the corresponding weight reduction groove 53 and penetrates the groove wall of the weight reduction groove 53, and when the casing 10 is formed by injection molding, the part of the casing 10 located in the through hole 52 and the part located in the weight reduction groove 53 are connected to sufficiently enhance the connection strength of the casing 10 and the heat dissipation plate 50, and firmly and sealingly connect the heat dissipation plate 50 and the casing 10 together.

[0090] In some optional embodiments of the utility model, as shown in Figure 2 The first glue groove 54 is defined between the heat dissipation plate 50 and the casing 10 and is arranged away from the impeller 30, and a glue sealing element is arranged in the first glue groove 54, so that the glue sealing element is arranged at the position where the heat dissipation plate 50 and the casing 10 are likely to have a gap, on the one hand, the glue sealing element can improve the connection strength of the heat dissipation plate 50 and the casing 10 at this position, and on the other hand, the region can be sealed, further reducing the possibility of liquid flowing to the controller.

[0091] In some optional embodiments of the utility model, as shown in Figures 3-5As shown, the heat dissipation plate 50 comprises a plate body part 501 and a supporting part 502, the supporting part 502 is arranged on the side of the plate body part 501 facing the first mounting cavity 11, the supporting part 502 is formed with a plug-in groove 5021, the plug-in groove 5021 is inserted and matched with the supporting shaft 70 to fix the other end of the supporting shaft 70, so that the supporting shaft 70 can stably support the rotation of the rotor assembly 42 and limit the shaking range of the rotor assembly 42.

[0092] The second communication channel 51 comprises a communication groove 511 and a communication hole 512, the communication groove 511 is formed on the bottom wall of the plug-in groove 5021 and is communicated with the first communication channel 71, so that when the supporting shaft 70 is inserted and arranged in the plug-in groove 5021, the first communication channel 71 in the supporting shaft 70 can be communicated with the communication groove 511, the communication hole 512 is formed on the circumferential wall of the supporting part 502 and penetrates the inner circumferential wall and the outer circumferential wall of the supporting part 502 to communicate the first mounting cavity 11 and the communication groove 511, and further communicate the first mounting cavity 11 and the first communication channel 71, so that the first mounting cavity 11 and the second mounting cavity 213 are communicated through the first communication channel 71, the liquid in the second mounting cavity 213 can reach the other end of the first mounting cavity 11, take away the heat on the heat dissipation plate 50 and then flow back into the second mounting cavity 213.

[0093] In some embodiments, the other end of the supporting shaft 70 is interference-fitted with the plug-in groove 5021 to fix the other end of the supporting shaft 70 on the heat dissipation plate 50.

[0094] In some optional embodiments of the utility model, as shown in the figure, Figure 3 As shown, the heat dissipation plate 50 comprises a plate body part 501 and a plurality of heat dissipation fins 503, the plurality of heat dissipation fins 503 are arranged on the side of the plate body part 501 facing the first mounting cavity 11, and the plurality of heat dissipation fins 503 are arranged on the outer circumferential side of the supporting shaft 70 in a circumferential direction, the heat dissipation fins 503 are arranged to increase the heat dissipation area of the heat dissipation plate 50, the heat dissipation fins 503 are arranged on the side of the plate body part 501 facing the first mounting cavity 11 to increase the area of the heat dissipation plate 50 in contact with the liquid, thereby increasing the heat dissipation efficiency of the heat dissipation plate 50 and improving the heat dissipation effect of the controller.

[0095] Among them, each heat dissipation fin 503 extends linearly or curvilinearly in the radial direction to reasonably arrange the plurality of heat dissipation fins 503 on the heat dissipation plate 50, and the plurality of heat dissipation fins 503 are used to improve the heat dissipation efficiency of the heat dissipation plate 50.

[0096] In some embodiments, the heat dissipation fin 503 extends curvilinearly in the radial direction, the plurality of heat dissipation fins 503 are arranged in a circumferential direction of the heat dissipation plate 50, and a flow-through channel 504 is defined between adjacent two heat dissipation fins 503.

[0097] Wherein, when the impeller 30 rotates and drives the liquid to flow into the second installation cavity 213 from the medium inlet 211, a part of the liquid flows out from the medium outlet 212, a part of the liquid flows to the end of the first installation cavity 11 at the other end through the gap between the rotor assembly 42 and the stator assembly 41, and then flows to the outer end region of the heat dissipation plate 50, the part of the liquid flows to the second communication channel 51 along the flow-through channel 504, flows into the first communication channel 71 through the second communication channel 51, and flows into the second installation cavity 213 along the first communication channel 71.

[0098] The bending direction of the heat dissipation fins 503 is matched with the rotating direction of the impeller 30, so that when the impeller 30 rotates, the driving force can be generated to make the liquid located at the outer end region of the heat dissipation plate 50 flow to the second communication channel 51 along the flow-through channel 504, so as to take away the heat on the heat dissipation plate 50 and flow to the second installation cavity 213.

[0099] In some embodiments, as shown in Figure 3 , the impeller 30 rotates in the clockwise direction, and the plurality of heat dissipation fins 503 bend in the counterclockwise direction, so that when the impeller 30 rotates, the driving force is formed on the heat dissipation plate 50 from the outside to the inside, thereby driving the liquid located at the outer end region of the heat dissipation plate 50 to flow to the central region of the heat dissipation plate 50 along the flow-through channel 504, to enter the first communication channel 71 through the second communication channel 51, and to enter the second installation cavity 213 along the first communication channel 71.

[0100] In some optional embodiments of the utility model, as shown in Figure 3 , Figure 5 , the heat dissipation plate 50 comprises a plate body part 501, a support part 502 and a plurality of heat dissipation fins 503, the support part 502 and the plurality of heat dissipation fins 503 are arranged on the side of the plate body part 501 facing the first installation cavity 11, the plurality of heat dissipation fins 503 are arranged on the outer circumferential side of the support part 502 in a circumferential direction, each heat dissipation fin 503 extends in a radial direction, the second communication channel 51 comprises a communication groove 511 and a communication hole 512, the communication groove 511 is formed in the support part 502 and communicates with the first communication channel 71, the communication hole 512 is formed on the circumferential wall of the support part 502 and penetrates the inner circumferential wall and the outer circumferential wall of the support part 502, so that the communication hole 512 communicates the communication groove 511 and the first installation cavity 11, and further communicates the first installation cavity 11 and the first communication channel 71, the first communication channel 71 communicates the first installation cavity 11 and the second installation cavity 213, so that the liquid in the second installation cavity 213 can reach the other end of the first installation cavity 11, take away the heat on the heat dissipation plate 50 and then flow back into the second installation cavity 213.

[0101] In some embodiments, as shown in Figure 5As shown, the support portion 502 is formed as a closed ring, the center axis of the communication hole 512 is arranged obliquely relative to the center axis of the support shaft 70, and the center axis of the communication hole 512 extends radially outward to the side of the heat dissipation fins 503 facing the first mounting cavity 11, so as to facilitate the formation of the communication hole 512 on the support portion 502.

[0102] Specifically, in some examples, the plate body portion 501, the support portion 502, and the plurality of heat dissipation fins 503 are integrally injection molded, and after the support portion 502 is formed, a hole needs to be drilled on the support portion 502 to process the communication hole 512, so that the center axis of the communication hole 512 extends radially outward to the side of the heat dissipation fins 503 facing the first mounting cavity 11, so as to avoid the heat dissipation fins 503 interfering with the processing of the hole, thereby ensuring that the communication hole 512 can be processed on the support portion 502.

[0103] In some examples, the communication hole 512 is arranged at the middle of the support portion 502 in the axial direction.

[0104] In another embodiment, the support portion 502 includes a plurality of arc-shaped fitting portions arranged at intervals in the circumferential direction, and the communication hole 512 is formed between two adjacent arc-shaped fitting portions, thereby connecting the first mounting cavity 11 and the communication groove 511, and further connecting the first mounting cavity 11 and the first communication passage 71, so that the liquid in the second mounting cavity 213 can reach the other end of the first mounting cavity 11, and after the liquid carries away the heat on the heat dissipation plate 50, it flows back into the second mounting cavity 213.

[0105] In some examples, the support portion 502 includes three arc-shaped fitting portions arranged at intervals in the circumferential direction, and the communication groove 511 is located inside the three arc-shaped fitting portions, and the communication hole 512 is formed between two adjacent arc-shaped fitting portions, thereby connecting the communication groove 511 and the first mounting cavity 11, and further connecting the first mounting cavity 11 and the first communication passage 71, so that the liquid in the second mounting cavity 213 can reach the other end of the first mounting cavity 11, and after the liquid carries away the heat on the heat dissipation plate 50, it flows back into the second mounting cavity 213.

[0106] In another embodiment of the present application, Figure 6As shown, the support shaft 70 is connected with the casing 10 by the first support 80, the heat dissipation plate 50 is assembled with the casing 10, the first support 80 is located on the side of the rotor assembly 42 facing the heat dissipation plate 50, the other end of the support shaft 70 is fixed by the first support 80, the support shaft 70 is stably arranged in the rotor assembly 42, the support shaft 70 can bear the force of the rotor assembly 42, and the support shaft 70 can stably support the rotation of the rotor assembly 42 and limit the shaking range of the rotor assembly 42.

[0107] As shown, the first support 80 is provided with a third communication channel communicating the two axial sides of the first support 80, the other end of the support shaft 70 can pass through the third communication channel and communicate with the other end of the first mounting cavity 11, the liquid in the first mounting cavity 11 can flow to the second mounting cavity 213 through the first communication channel 71, the liquid can circulate in the second mounting cavity 213, the first mounting cavity 11 and the first communication channel 71, and then the heat on the heat dissipation plate 50 is taken away, and the heat dissipation plate 50 and the controller are cooled.

[0108] Further, as shown in the drawings, Figure 6 the other end of the support shaft 70 away from the pump cover 20 is spaced apart from the heat dissipation plate 50, so that the heat dissipation plate 50 does not block the third communication channel and the first communication channel 71, and then the liquid in the first mounting cavity 11 can smoothly enter the first communication channel 71, or the liquid in the first communication channel 71 can smoothly enter the first mounting cavity 11, so that the liquid can circulate in the second mounting cavity 213 and the first mounting cavity 11, and then the heat on the heat dissipation plate 50 is taken away, and the heat dissipation plate 50 and the controller are cooled.

[0109] In some embodiments of the utility model, as shown in the drawings, Figure 10 , Figure 11 and Figure 13 , Figure 14 the first support 80 comprises a first connecting piece 81 and a plurality of second connecting pieces 82 arranged in the circumferential direction, the first connecting piece 81 is sleeved on the support shaft 70, and each second connecting piece 82 connects the outer circumferential wall of the first connecting piece 81 and the inner circumferential wall of the casing 10, so that the first connecting piece 81 and the inner circumferential wall of the casing 10 are connected by the second connecting piece 82, the other end of the support shaft 70 is supported by the first connecting piece 81, the rotation of the rotor assembly 42 is supported by the support shaft 70, and the shaking range of the rotor assembly 42 is limited, so that the rotor assembly 42 can stably rotate.

[0110] In some embodiments, as shown in the drawings, Figure 12As shown, the outer circumferential wall and the inner circumferential wall of the stator assembly 41 are wrapped by the casing 10, and during the injection molding, the casing 10 enters between two adjacent stator teeth 4111, that is, the wall thickness of the casing 10 between the two stator teeth 4111 is thick, and the second connecting piece 82 is connected to the casing 10 at the position corresponding to the portion between the two adjacent stator teeth 4111 of the stator assembly 41, so that the second connecting piece 82 is connected to the casing 10 at the position with thick wall thickness, thereby facilitating the firm connection of the casing 10 and the second connecting piece 82.

[0111] In some examples, as shown in Figure 12 As shown, in order to facilitate molding, a groove portion 14 is arranged on the portion of the casing 10 between the two adjacent stator teeth 4111, and the groove portion 14 extends along the axial direction of the support shaft 70, so as to reduce the wall thickness difference between the portion of the casing 10 located at the inner circumferential wall of the stator assembly 41 and the portion of the casing 10 between the two adjacent stator teeth 4111, thereby facilitating the integral molding of the casing 10.

[0112] In some embodiments, as shown in Figure 6 As shown, the stator assembly 41 is sleeved on the rotor assembly 42, the first support 80 is located on the side of the rotor assembly 42 away from the pump cover 20, and in the radial direction, the end portion of the first support 80 exceeds the rotor assembly 42, so as to be connected with the inner wall of the casing 10, thereby fixing the position of the first support 80, and the end portion of the support shaft 70 at the other end is fixed by the first support 80.

[0113] In some specific embodiments, the casing 10 is injection molded, so that the casing 10 is a plastic part, and the circulation flow of the liquid in the first mounting cavity 11, the second mounting cavity 213 and the first communication passage 71 is used for heat dissipation, thereby reducing the cost by about 20%.

[0114] In some optional embodiments of the utility model, the first connecting structure is integrally arranged on the casing 10, the first connecting structure penetrates through the heat dissipation plate 50, and is hot riveted on the heat dissipation plate 50, so as to fixedly connect the casing 10 and the heat dissipation plate 50 together.

[0115] In some embodiments, as shown in Figures 7-9 As shown, the first connecting hole 55 is arranged on the heat dissipation plate 50, the first connecting structure penetrates through the first connecting hole 55, and then the portion of the first connecting structure penetrating through the first connecting hole 55 is subjected to hot riveting processing, so as to form the first abutting portion at the end portion of the first connecting structure, the heat dissipation plate 50 is clamped between the first abutting portion and the casing 10, thereby fixedly connecting the heat dissipation plate 50 and the casing 10 together.

[0116] In some embodiments, as shown in Figure 11As shown, the sealing member 91 is arranged between the casing 10 and the heat dissipation plate 50 in the axial direction of the support shaft 70, and is clamped between the casing 10 and the heat dissipation plate 50 in the axial direction of the support shaft 70, so as to seal the gap between the casing 10 and the heat dissipation plate 50 and reduce the possibility of liquid in the first mounting cavity 11 flowing to the control member.

[0117] The fixing force between the first connecting structure and the heat dissipation plate 50 extends in the axial direction of the support shaft 70, and the sealing member 91 is clamped between the casing 10 and the heat dissipation plate 50 in the axial direction of the support shaft 70, so as to clamp the sealing member 91 by the action force between the first connecting structure and the heat dissipation plate 50, and enable the sealing member 91 to fully seal the gap between the heat dissipation plate 50 and the casing 10.

[0118] In other embodiments, as shown in the drawings, Figure 11 The sealing member 91 is arranged between the casing 10 and the heat dissipation plate 50 in the radial direction of the support shaft 70, and is clamped between the casing 10 and the heat dissipation plate 50 in the radial direction of the support shaft 70, so as to seal the gap between the casing 10 and the heat dissipation plate 50 and reduce the possibility of liquid in the first mounting cavity 11 flowing to the control member.

[0119] The fixing force between the first connecting structure and the heat dissipation plate 50 extends in the axial direction of the support shaft 70, and the sealing member 91 is clamped between the casing 10 and the heat dissipation plate 50 in the radial direction of the support shaft 70, so as to avoid reducing the action force of the sealing member 91 on the first connecting structure and the heat dissipation plate 50 in the axial direction, reducing the action force of the first connecting structure and the heat dissipation plate 50 away from each other in the axial direction, and further improving the stability of the connection between the first connecting structure and the heat dissipation plate 50.

[0120] In some embodiments of the present application, as shown in the drawings, Figure 1 , Figure 2 The pump cover 20 includes a cover body 21 and a second bracket 22, the medium inlet 211 and the medium outlet 212 are formed on the cover body 21, and the second bracket 22 is arranged at the medium inlet 211 and is in plug-in cooperation with the support shaft 70 to fix one end of the support shaft 70 in the axial direction, thereby limiting the position of the support shaft 70, stably penetrating the support shaft 70 in the rotor assembly 42, enabling the support shaft 70 to bear the action force of the rotor assembly 42 on it, and further enabling the support shaft 70 to stably support the rotation of the rotor assembly 42 and limit the shaking amplitude of the rotor assembly 42.

[0121] The second bracket 22 is formed with a flow control hole 221 communicating the medium inlet 211 and the first communication channel 71, and the opening area of the flow control hole 221 is smaller than the flow area of the first communication channel 71, so as to control the flow entering the first communication channel 71, and further control the flow of liquid entering the first mounting cavity 11, and reduce the influence on the liquid flow at the medium outlet 212.

[0122] The communication position of the first installation cavity 11 and the second installation cavity 213 is adjacent to the medium outlet 212 in the radial direction, the opening area of the flow control hole 221 is smaller than the flow area of the first communication channel 71, the pressure at the first communication channel 71 can be increased, and then the flow of the liquid into the first installation cavity 11 from the second installation cavity 213 is controlled, so that too much liquid does not enter the first installation cavity 11 and affect the flow at the medium outlet 212.

[0123] In some embodiments, the second communication channel 51 is formed on the heat dissipation plate 50 and communicates the first installation cavity 11 and the first communication channel 71, the flow area of the second communication channel 51 is greater than or equal to the opening area of the flow control hole 221, so as to control the flow into the first communication channel 71 and then control the flow of the liquid into the first installation cavity 11, so that too little liquid in the second installation cavity 213 enters the first installation cavity 11.

[0124] In some embodiments, the flow area of the third communication channel on the first support 80 is greater than or equal to the opening area of the flow control hole 221, so that too little liquid in the second installation cavity 213 enters the first installation cavity 11 and affects the heat dissipation effect of the heat dissipation plate 50 and the controller.

[0125] In some embodiments of the utility model, as shown in Figure 2 , As shown in Figure 6 , the bearing 92 is located between the support shaft 70 and the rotor assembly 42, and the bearing 92 is in rotating fit with the support shaft 70, so as to reduce the wear between the support shaft 70 and the rotor assembly 42, and then improve the service life of the electronic water pump 1.

[0126] In some examples, the rotor assembly 42 is in interference fit with the outer peripheral wall of the bearing 92, when the rotor assembly 42 rotates, the rotor assembly 42 drives the bearing 92 to rotate, at this time, the bearing 92 rotates relative to the support shaft 70, so as to limit the shaking of the bearing 92 and the rotor assembly 42 by the support shaft 70, and make the rotor assembly 42 rotate stably.

[0127] As shown in Figure 15 , the support shaft 70 includes the first shaft segment 701, the second shaft segment 702 and the third shaft segment 703 which are sequentially arranged in the axial direction, the first shaft segment 701 and the third shaft segment 703 are respectively in rotating fit with the bearing 92, and the outer peripheral wall of the second shaft segment 702 is recessed relative to the first shaft segment 701 and the third shaft segment 703, so as to reduce the contact area between the bearing 92 and the support shaft 70, and then reduce the wear between the support shaft 70 and the bearing 92.

[0128] The first shaft section 701 and the third shaft section 703 are located at two ends of the support shaft 70 in the axial direction, and the first shaft section 701 and the third shaft section 703 are in rotational fit with the bearing 92 to support two ends of the bearing 92 in the axial direction, thereby reducing the swing range of the bearing 92 and the rotor assembly 42 at the two ends in the axial direction and ensuring stable rotation of the bearing 92 and the rotor assembly 42.

[0129] In some embodiments, the first shaft section 701 is fixedly fitted with the pump cover 20, and the third shaft section 703 is spaced apart from the heat dissipation plate 50 and fixedly fitted with the casing 10 to fix two ends of the support shaft 70 in the axial direction, thereby stably supporting the rotation of the bearing 92 and the rotor assembly 42 by the support shaft 70 and limiting the swing of the bearing 92 and the rotor assembly 42.

[0130] In some embodiments, the first shaft section 701 is fixedly fitted with the pump cover 20, and the third shaft section 703 is fixedly fitted with the heat dissipation plate 50 to fix two ends of the support shaft 70 in the axial direction, thereby stably supporting the rotation of the bearing 92 and the rotor assembly 42 by the support shaft 70 and limiting the swing of the bearing 92 and the rotor assembly 42.

[0131] In some examples, as shown in Figure 2 The pump cover 20 includes a cover body 21 and a second bracket 22, the cover body 21 defines a second mounting cavity 213, a medium inlet 211 and a medium outlet 212, the second bracket 22 is located on a side of the medium inlet 211 facing the first mounting cavity 11, and at least part of the second bracket 22 is located in the second mounting cavity 213.

[0132] The second bracket 22 has a mounting groove, and the end of the first shaft section 701 extends into the mounting groove to be fixedly fitted with the second bracket 22.

[0133] In some embodiments, the length of the first shaft section 701 is L1, the length of the third shaft section 703 is L2, the inner diameter of the bearing 92 is D, 0.8≤L1 / D≤1.2, and 0.8≤L2 / D≤1.2, so as to control the length of the first shaft section 701 and the second shaft section 702, thereby making the support shaft 70 have sufficient length to cooperate with the bearing 92 to sufficiently support the rotation of the bearing 92 and limit the swing of the bearing 92.

[0134] In some embodiments of the utility model, as shown in Figure 16As shown, the rotor assembly 42 comprises a rotor core 421, a rotor insulation 422, and a plurality of permanent magnets 423, the plurality of permanent magnets 423 are circumferentially spaced apart on the rotor core 421, and the rotor insulation 422 injection-molds the rotor core 421 and the permanent magnets 423 and injection-molds connects the rotor core 421 and the permanent magnets 423, the outer circumferential wall of the rotor core 421 is exposed to the rotor insulation 422, the impeller 30 and the rotor insulation 422 are integrally injection-molded, when the rotor assembly 42 rotates, the rotor assembly 42 directly drives the impeller 30 to rotate through the rotor insulation 422.

[0135] Wherein, the impeller 30 comprises a first end plate 31, a second end plate 32, and a plurality of blades 33 arranged between the first end plate 31 and the second end plate 32, the second end plate 32 is formed with an impeller inlet 321 opposite to the medium inlet 211, a gap between the radial outer end of the first end plate 31 and the radial outer end of the second end plate 32 is formed as an impeller outlet 34, the axial dimension of the impeller outlet 34 is H, the axial dimension of the end face of the first end plate 31 towards the second end plate 32 is Y1, the axial dimension of the end face of the second end plate 32 towards the first end plate 31 is Y2, H is greater than or equal to Y1, and H is greater than or equal to Y2, so that the first end plate 31, the second end plate 32, and the plurality of blades 33 can be integrally formed.

[0136] Specifically, H is greater than or equal to Y1, and H is greater than or equal to Y2, to ensure that the mold located between the first end plate 31, the second end plate 32, and the adjacent two blades 33 can be demolded from the impeller outlet 34, and thus the first end plate 31, the second end plate 32, and the plurality of blades 33 can be integrally formed.

[0137] Here, it needs to be explained that when the end face of the first end plate 31 towards the second end plate 32 extends in the horizontal direction, Y1 is 0. When the end face of the second end plate 32 towards the first end plate 31 extends in the horizontal direction, Y2 is 0.

[0138] In some embodiments, the first end plate 31, the second end plate 32, and the plurality of blades 33 are integrally formed, so that the first end plate 31, the second end plate 32, and the plurality of blades 33 are integrally formed, thus without the need to assemble and fix the first end plate 31, the plurality of blades 33, and the second end plate 32, and thus facilitating to reduce the processing steps, reduce the processing difficulty, and reduce the processing cost.

[0139] In addition, the first end plate 31, the second end plate 32, and the blades 33 are integrally formed, which facilitates to control the coaxiality of the first end plate 31, the second end plate 32, the plurality of blades 33, and the rotor assembly 42, and thus facilitates to improve the stability of the rotation of the rotor assembly 42, improve the water pumping effect of the electronic water pump 1, and reduce the noise.

[0140] In some embodiments, the vane 33 is demolded by a process of rotational demolding of the first mold and the second mold, which are arranged in axial stacking between the first end plate 31 and the second end plate 32. The first mold is used to conform to the first end plate 31, and the first mold is shaped to the end face of the first end plate 31 towards the second end plate 32. The second mold is used to conform to the second end plate 32, and the second mold is shaped to the end face of the second end plate 32 towards the first end plate 31.

[0141] The axial dimension of the first mold is greater than or equal to Y2, so that after the first end plate 31, the second end plate 32 and the plurality of vanes 33 are integrally formed, the first mold and the second mold can be respectively demolded.

[0142] Specifically, between each two adjacent vanes 33, the first mold and the second mold are arranged in axial stacking, and the rotational demolding refers to the demolding of the mold from the outer end of the plurality of vanes 33, that is, by rotating the rotor assembly 421, the mold is moved outward under the action of centrifugal force, thereby realizing demolding.

[0143] The end face of the second end plate 32 towards the first end plate 31 is inclined radially outward and axially towards the first end plate 31, and the axial dimension of the end face of the second end plate 32 towards the first end plate 31 is Y2, that is, in the axial direction, the distance between the inner end of the second end plate 32 and the inner end of the first end plate 31 is larger, and the distance between the outer end of the second end plate 32 and the outer end of the first end plate 31 is smaller, so that the first mold and the second mold are arranged in axial stacking. In this way, the first mold can be demolded first, and after the first mold is demolded, the second mold can move towards the first end plate 31, and then the second mold can be demolded from the outer end of the first end plate 31 and the second end plate 32.

[0144] The axial dimension of the first mold is greater than or equal to Y2, so that after the first mold is demolded, the maximum axial dimension of the second mold is less than or equal to the axial dimension of the outer end of the first end plate 31 and the second end plate 32, so that the second mold can be smoothly demolded.

[0145] In some embodiments, the rotor insulation 422 is an integrally formed part, and the outer peripheral wall of the rotor core 421 is exposed to the rotor insulation 422, so that the gap between the rotor core 421 and the stator core 411 can be reduced, and the air gap of the motor 40 can be reduced, so that the efficiency of the motor 40 can be improved by about 3%, and the manufacturing cost can be reduced by about 10%.

[0146] In some embodiments of this utility model, the controller includes a circuit board 61 and electronic components. Thermally conductive adhesive is provided between the circuit board 61 and the heat sink 50. All electronic components are located on the side of the circuit board 61 facing away from the heat sink 50. This allows the shape of the side of the circuit board 61 facing the heat sink 50 to be unconstrained by the electronic components. For example, it is convenient to form a plane or other surface on the side of the circuit board 61 facing the heat sink 50, which facilitates the connection between the heat sink 50 and the circuit board 61 by the thermally conductive adhesive. This allows the heat on the circuit board 61 to be transferred to the heat sink 50 through the thermally conductive adhesive, and the heat sink 50 is used to dissipate the heat on the circuit board 61.

[0147] All electronic components are placed on the side of the circuit board 61 away from the heat sink 50. This means that only one side of the circuit board 61 needs to be laid out and the board is made, reducing the processing steps by half and making it easier to reduce process costs.

[0148] In some embodiments, such as Figure 10 , Figure 11 As shown, the housing 10 is integrally provided with a second connecting structure 13. The second connecting structure 13 is located on the outer periphery of the heat sink 50 and passes through the circuit board 61. The second connecting structure 13 is thermally riveted to the circuit board 61 to fix the heat sink 50 and the circuit board 61 together, thereby improving the connection strength between the heat sink 50 and the circuit board 61.

[0149] Specifically, the heat sink 50 and the circuit board 61 are fixedly connected together using the second connecting structure 13, eliminating the screw tightening process and reducing costs. Furthermore, compared to the inverted snap-fit ​​structure, the heat-riveting method results in a smaller volume and lower requirements.

[0150] In some examples, such as Figure 17 As shown, a second connection hole 611 is provided in the area of ​​the circuit board 61 where there is no circuit. The second connection structure 13 is adapted to pass through the second connection hole 611. The end of the second connection structure 13 passing through the second connection hole 611 is hot-riveted to form a second stop portion at the end of the second connection structure 13 passing through the second connection hole 611. The circuit board 61 is then clamped between the heat sink 50 and the second stop portion to fix the heat sink 50 and the circuit board 61 together.

[0151] In some embodiments, such as Figures 17-20 As shown, the electronic water pump 1 also includes a connection terminal 93. The connection terminal 93 has a sheet-like structure and includes a connection portion 931 and multiple heads 932. The multiple heads 932 are spaced apart along the width direction of the connection portion 931 at one end of the length of the connection portion 931 and are inserted into the same insertion hole 612 on the circuit board 61. The multiple heads 932 are used to realize the electrical connection between the connection terminal 93 and the circuit board 61. On the one hand, this facilitates the improvement of the stability of the electrical connection between the connection terminal 93 and the circuit board 61, and on the other hand, it can improve the current carrying capacity.

[0152] Wherein, each head 932 is formed with an elastic hole 933, the width of the head 932 increases first and then decreases along the length direction of the connecting part 931, so that the head 932 can be smoothly matched with the plug-in hole 612 on the circuit board 61, and the head 932 and the plug-in hole 612 are not easily separated, thereby improving the stability of the electrical connection between the head 932 and the plug-in hole 612.

[0153] In some embodiments, the thickness of the connecting terminal 93 is greater than or equal to 0.8mm, so that the connecting terminal 93 has a certain structural strength, and the connecting terminal 93 is suitable for bearing a larger force when the connecting terminal 93 is plugged with the plug-in hole 612, so that the connecting terminal 93 is not easily broken.

[0154] In some examples, the thickness of the connecting terminal 93 can be 0.8mm, 1mm, 1.2mm, 1.5mm, 1.8mm, or 2mm, which is not limited here.

[0155] In some embodiments of the utility model, as shown in Figure 2 , Figure 18 , Figure 19 As shown, the electronic water pump 1 further comprises a rear cover 94, the rear cover 94 is arranged at one end of the shell 10 away from the pump cover 20, the rear cover 94 and the shell 10 and the heat dissipation plate 50 define a third installation cavity 941, and the controller is arranged in the third installation cavity 941 to provide a relatively closed working environment for the controller by using the rear cover 94, so that the controller can work smoothly.

[0156] In some embodiments, as shown in Figure 18 The rear cover 94 is configured to satisfy condition A1, and the inner wall surface of the rear cover 94 opposite to the controller is provided with a reinforcing structure 95, the reinforcing structure 95 comprises a plurality of first ribs 951 spaced apart along a first direction and a plurality of second ribs 952 spaced apart along a second direction, each first rib 951 extends linearly along the second direction, each second rib 952 extends linearly along the first direction, the first rib 951 and the second rib 952 are arranged at right angles, and the first direction and the second direction are perpendicular to the axial direction of the support shaft 70, so as to increase the structural strength of the rear cover 94 by using the reinforcing structure 95, and to better protect the components in the third installation cavity 941 by using the rear cover 94.

[0157] In some examples, the length of each first rib 951 is connected to the inner circumferential wall of the rear cover 94 at both ends, and the length of each second rib 952 is connected to the inner circumferential wall of the rear cover 94 at both ends, so as to increase the length of the first rib 951 and the second rib 952, and thereby sufficiently increase the structural strength of the rear cover 94.

[0158] In some embodiments, as shown in Figure 8 ,Figure 9 As shown, the rear cover 94 is configured to meet condition A2, the controller is provided with a connecting terminal 93, the connecting terminal 93 penetrates through the rear cover 94 and is injection-molded with the rear cover 94, and the controller can be electrically connected with external structures through the connecting terminal 93.

[0159] As shown, the rear cover 94 is configured to meet condition A2, the controller is provided with a connecting terminal 93, the connecting terminal 93 penetrates through the rear cover 94 and is injection-molded with the rear cover 94, and the controller can be electrically connected with external structures through the connecting terminal 93.

[0160] As shown, the rear cover 94 is configured to meet condition A2, the controller is provided with a connecting terminal 93, the connecting terminal 93 penetrates through the rear cover 94 and is injection-molded with the rear cover 94, and the controller can be electrically connected with external structures through the connecting terminal 93.

[0161] In some examples, the rear cover 94 and the casing 10 are connected by infrared welding, which can ensure the connection strength and sealing effect.

[0162] As shown, the rear cover 94 is configured to meet condition A2, the controller is provided with a connecting terminal 93, the connecting terminal 93 penetrates through the rear cover 94 and is injection-molded with the rear cover 94, and the controller can be electrically connected with external structures through the connecting terminal 93. Figure 18 , Figure 19 As shown, the rear cover 94 is configured to meet condition A2, the controller is provided with a connecting terminal 93, the connecting terminal 93 penetrates through the rear cover 94 and is injection-molded with the rear cover 94, and the controller can be electrically connected with external structures through the connecting terminal 93.

[0163] As shown, the rear cover 94 is configured to meet condition A2, the controller is provided with a connecting terminal 93, the connecting terminal 93 penetrates through the rear cover 94 and is injection-molded with the rear cover 94, and the controller can be electrically connected with external structures through the connecting terminal 93.

[0164] In some examples, one end of the connection terminal 93 is electrically connected to the circuit board 61, and the other end penetrates through the first wall portion 9461 and is used to be electrically connected to an external component.

[0165] In some embodiments of the utility model, as shown in Figure 12 The stator assembly 41 includes a stator core 411, an insulating support 412, and a stator winding 413, the insulating support 412 is an injection molding part and injection wraps the stator core 411, the stator winding 413 is installed on the insulating support 412, and the shell 10 is an injection molding body and injection wraps the stator assembly 41 to injection connect the shell 10 and the stator assembly 41 together.

[0166] In some embodiments, as shown in Figure 12 The stator core 411 includes a plurality of stator tooth portions 4111, the plurality of stator tooth portions 4111 are arranged at intervals in a circumferential direction, and an accommodation cavity with a notch is defined between adjacent two stator tooth portions 4111, the insulating support 412 wraps the inner peripheral wall of the accommodation cavity and the outer peripheral wall of the stator core 411, and the stator winding 413 is wound on the stator tooth portion 4111 and the insulating support 412.

[0167] In some embodiments, as shown in The stator assembly 41 is arranged in a mold when the shell 10 is integrally injection molded, then injection liquid is added into the mold, so that the shell 10 wraps the outer peripheral wall of the insulating support 412 and the inner peripheral wall of the stator core 411, at least part of the injection liquid enters the accommodation cavity to wrap the stator winding 413 in the accommodation cavity, so as to fix the position of the stator winding 413 and protect the stator assembly 41.

[0168] A heat management system according to embodiments of the utility model is described below. The heat management system according to embodiments of the utility model includes the electronic water pump 1 according to the above embodiments of the utility model.

[0169] Since the electronic water pump 1 according to the utility model has the above beneficial technical effects, the liquid in the heat management system according to embodiments of the utility model can circulate and flow in the first mounting cavity 11, the second mounting cavity 213, and the first communication passage 71, and the liquid can take away the heat on the heat dissipation plate 50 when circulating and flowing, thereby achieving heat dissipation of the controller. In this way, the heat dissipation is no longer relied on the shell 10, the heat dissipation effect is improved, and the material of the shell 10 is not limited, thereby facilitating cost reduction.

[0170] In some embodiments, the heat management system is an important component for adjusting the environment (temperature, humidity, etc.) of the automobile cabin and the working environment of other components, and mainly includes valves, heat exchangers, compressors, pumps, integrated modules, and the like. The pump is, for example, a water pump or other water pump. The heat management system has circulating refrigerant therein, and the refrigerant can be carbon dioxide refrigerant or the like.

[0171] In some embodiments, as shown in Figure 7 The water pump is an electronic water pump 1, which can be used in a thermal management system of the vehicle 1000, the thermal management system being an important component for regulating the environment (temperature, humidity, etc.) of the automobile cabin and the working environment of other components, wherein the thermal management system of the vehicle 1000 mainly comprises: valves, heat exchangers, compressors, pumps and integrated modules, etc., and the pumps are, for example, the electronic water pump 1 or other water pumps, wherein the thermal management system has circulating refrigerant, which can be liquid coolant or carbon dioxide refrigerant, etc.

[0172] The vehicle 1000 according to the embodiments of the present application is described below. The vehicle 1000 according to the embodiments of the present application comprises the electronic water pump 1 or the thermal management system according to the above embodiments of the present application.

[0173] Since the thermal management system according to the embodiments of the present application has the above beneficial technical effects, the liquid in the vehicle 1000 according to the embodiments of the present application can circulate in the first mounting cavity 11, the second mounting cavity 213 and the first communication passage 71, and the liquid can take away the heat on the heat dissipation plate 50 when circulating, thereby achieving heat dissipation of the controller. In this way, the heat dissipation is no longer relied on the casing 10, the heat dissipation effect is improved, and the material of the casing 10 is not limited, thereby facilitating cost reduction.

[0174] The vehicle 1000 can be a new energy vehicle, and in some embodiments, the new energy vehicle can be a pure electric vehicle with the motor 40 as the main driving force, and in other embodiments, the new energy vehicle can also be a hybrid vehicle with the internal combustion engine and the motor 40 as the main driving force. As mentioned above in the embodiments, the internal combustion engine and the motor 40 provide driving force for the new energy vehicle, wherein the internal combustion engine can use gasoline, diesel, hydrogen, etc. as fuel, and the motor 40 can use power batteries, hydrogen fuel cells, etc. to provide electric energy, which is not limited here. It should be noted that this is only an exemplary description of the structure of the new energy vehicle, and does not limit the protection scope of the present application.

[0175] The other configurations and operations of the electronic water pump 1, the thermal management system and the vehicle 1000 according to the embodiments of the present application are known to those skilled in the art, and will not be described in detail here.

[0176] In the description of the utility model, it is necessary to understand that the orientation or positional relation indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" is the orientation or positional relation based on the orientation or positional relation shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the features limited by "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the utility model, unless otherwise specified, the meaning of "a plurality of" is two or more. In the description of the utility model, the "above" or "below" of the first feature to the second feature can include that the first and second features are in direct contact, or can include that the first and second features are not in direct contact but are in contact through another feature between them.

[0177] In the description of the utility model, the "above", "upper" and "upper surface" of the first feature to the second feature include that the first feature is directly above and obliquely above the second feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature.

[0178] In the description of the utility model, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0179] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0180] Although the embodiments of the utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and purposes of the utility model, and the scope of the utility model is defined by the claims and their equivalents.

Claims

1. An electronic water pump characterized by, The utility model relates to an electronic water pump, comprising: a casing having a first mounting cavity therein; a pump cover covering an axial end of the casing and having a second mounting cavity therein, an axial end of the first mounting cavity being in communication with the second mounting cavity, the second mounting cavity having a medium inlet and a medium outlet; an impeller rotatably arranged in the second mounting cavity; a motor comprising a stator assembly and a rotor assembly arranged in a sleeving manner, the casing covering the stator assembly so that the stator assembly is fixedly arranged in the casing, the rotor assembly being arranged in the first mounting cavity and fixedly connected with the impeller; a heat dissipation plate covering an axial other end of the casing and being sealingly connected with the casing; a controller arranged on a side of the heat dissipation plate away from the first mounting cavity and being in heat conduction with the heat dissipation plate; a support shaft penetrating the rotor assembly and being rotatably connected with the rotor assembly, an axial end of the support shaft being connected with the pump cover, at least one of the casing, the heat dissipation plate and the stator assembly being connected with an axial other end of the support shaft, the support shaft being formed with a first communication channel to communicate an axial other end of the first mounting cavity with the second mounting cavity, the communication position of the first mounting cavity and the second mounting cavity being located radially outside the first communication channel.

2. The electronic water pump of claim 1, wherein The heat dissipation plate is injection-molded with the casing, the support shaft is arranged in a spaced manner with the casing, and the support shaft is fixedly assembled with the heat dissipation plate, the heat dissipation plate being formed with a second communication channel to communicate the first mounting cavity with the first communication channel.

3. The electronic water pump according to claim 2, wherein an edge of the heat dissipation plate is formed with a plurality of through holes arranged in a spaced manner in a circumferential direction, the casing comprises a first part and a second part which are integrally injection-molded, the first part being injection-molded with a hole wall of the through hole, and the second part wrapping the edge of the heat dissipation plate and being connected with axial ends of the first part; and / or an edge of the heat dissipation plate is formed with a plurality of lightening grooves arranged in a spaced manner in a circumferential direction, the casing wrapping the edge of the heat dissipation plate and being injection-molded with a groove wall of the lightening groove.

4. The electronic water pump of claim 3, wherein An edge of the heat dissipation plate is formed with a plurality of through holes and a plurality of lightening grooves, each of the through holes being formed outside the corresponding lightening groove and penetrating a groove wall of the lightening groove.

5. The electronic water pump of claim 2, wherein, A first glue groove is defined between the heat dissipation plate and the casing and arranged away from the impeller, and a glue sealing element is arranged in the first glue groove.

6. The electronic water pump of claim 2, wherein, The heat dissipation plate comprises a plate body part and a support part arranged on a side of the plate body part facing the first mounting cavity, the support part being formed with a plug-in groove for plug-in connection with the support shaft, the second communication channel comprises a communication groove and a communication hole which are in communication, the communication groove being formed on a bottom wall of the plug-in groove and being in communication with the first communication channel, and the communication hole being formed on a circumferential wall of the support part and penetrating an inner circumferential wall and an outer circumferential wall of the support part.

7. The electronic water pump of claim 2, wherein, The heat dissipation plate comprises a plate body and a plurality of heat dissipation fins, the plurality of heat dissipation fins are arranged on the side of the plate body facing the first mounting cavity, the plurality of heat dissipation fins are arranged on the outer circumferential side of the support shaft at intervals in the circumferential direction, and each heat dissipation fin extends linearly or curvilinearly in the radial direction.

8. The electronic water pump of claim 2, wherein, The heat dissipation plate comprises a plate body, a support portion and a plurality of heat dissipation fins, the support portion and the plurality of heat dissipation fins are arranged on the side of the plate body facing the first mounting cavity, the plurality of heat dissipation fins are arranged on the outer circumferential side of the support portion at intervals in the circumferential direction, and each heat dissipation fin extends in the radial direction, the second communication passage comprises a communication groove and a communication hole, the communication groove is formed in the support portion and communicates with the first communication passage, and the communication hole is formed on the circumferential wall of the support portion and penetrates the inner circumferential wall and the outer circumferential wall of the support portion, The support portion is formed in a closed ring shape, the central axis of the communication hole is arranged obliquely relative to the central axis of the support shaft, and the central axis of the communication hole extends outward in the radial direction to the side of the heat dissipation fin facing the first mounting cavity; or The support portion comprises a plurality of arc-shaped fitting portions arranged at intervals in the circumferential direction, and the communication hole is formed between two adjacent arc-shaped fitting portions.

9. The electronic water pump according to any one of claims 1 to 8, characterized in that The pump cover comprises a cover body and a second support, the medium inlet and the medium outlet are formed on the cover body, the second support is arranged at the medium inlet and is inserted and fitted with the support shaft, a flow control hole communicating the medium inlet and the first communication passage is formed on the second support, the opening area of the flow control hole is smaller than the flow area of the first communication passage, and the communication position of the first mounting cavity and the second mounting cavity is adjacent to the medium outlet in the radial direction.

10. The electronic water pump according to any one of claims 1 to 8, characterized in that A bearing is arranged between the support shaft and the rotor assembly, the support shaft comprises a first shaft segment, a second shaft segment and a third shaft segment arranged in sequence in the axial direction, the first shaft segment and the third shaft segment are respectively rotationally fitted with the bearing, and the outer circumferential wall of the second shaft segment is arranged in a recessed manner relative to the first shaft segment and the third shaft segment.

11. The electronic water pump according to any one of claims 1 to 8, characterized in that The rotor assembly comprises a rotor core, a rotor insulating member and a plurality of permanent magnets, the plurality of permanent magnets are arranged at intervals in the circumferential direction on the rotor core, and the rotor insulating member injection-molds and connects the rotor core and the permanent magnets, the outer circumferential wall of the rotor core is exposed to the rotor insulating member, the impeller and the rotor insulating member are an integral injection-molded part, the impeller comprises a first end plate, a second end plate and a plurality of blades arranged between the first end plate and the second end plate, the second end plate is provided with an impeller inlet opposite to the medium inlet, a gap between the radial outer end of the first end plate and the radial outer end of the second end plate is formed as an impeller outlet, the axial dimension of the impeller outlet is H, the axial dimension of the end face of the first end plate facing the second end plate is Y1, the axial dimension of the end face of the second end plate facing the first end plate is Y2, H is greater than or equal to Y1, and H is greater than or equal to Y2.

12. The electronic water pump of any one of claims 1-8, wherein, The controller comprises a circuit board and electronic devices, a heat-conducting adhesive is arranged between the circuit board and the heat sink, all the electronic devices are arranged on a side of the circuit board away from the heat sink, The second connecting structure is integrally arranged on the shell, is arranged on the outer circumferential side of the heat sink, penetrates the circuit board, and is hot riveted to the circuit board; and / or The electronic water pump further comprises a connecting terminal, the connecting terminal is a sheet structure and comprises a connecting portion and a plurality of head portions, the plurality of head portions are arranged at one end of the length of the connecting portion in the width direction of the connecting portion and are inserted into the same insertion hole on the circuit board, each head portion is formed with an elastic hole and the width of the head portion increases first and then decreases along the length direction of the connecting portion, and the thickness of the connecting terminal is greater than or equal to 0.8 mm.

13. The electronic water pump of any one of claims 1-8, wherein, Further comprising: A rear cover is arranged at one end of the shell away from the pump cover and defines a third mounting cavity with the shell and the heat sink, the controller is arranged in the third mounting cavity, and the rear cover is configured to satisfy at least one of the following conditions: Condition A1, the inner wall surface of the rear cover opposite to the controller is provided with a reinforcing structure, the reinforcing structure comprises a plurality of first ribs arranged in a first direction and a plurality of second ribs arranged in a second direction, each first rib extends linearly in the second direction, each second rib extends linearly in the first direction, the first ribs and the second ribs are arranged intersectingly, and the first direction and the second direction are perpendicular to the axial direction of the support shaft; Condition A2, a connecting terminal is arranged on the controller, the connecting terminal penetrates the rear cover and is injection-molded with the rear cover, a second glue groove is formed on the inner wall surface and / or the outer wall surface of the rear cover, the second glue groove surrounds the connecting terminal, and a glue sealing element is arranged in the second glue groove; Condition A3, the rear cover is welded and fixed with the shell, and the outer peripheral wall of the rear cover is provided with a welding positioning hole; Condition A4, the rear cover comprises a surrounding plate and a bottom plate, the surrounding plate surrounds the outer periphery of the bottom plate and is fixed with the shell, the bottom plate comprises a first wall portion and a second wall portion arranged oppositely in a first direction, in the axial direction of the support shaft, the distance between the first wall portion and the shell is less than the distance between the second wall portion and the shell, a connecting terminal is arranged on the controller, the connecting terminal penetrates the first wall portion, and the first direction is perpendicular to the axial direction of the support shaft.

14. The electronic water pump of any one of claims 1-8, wherein, The stator assembly comprises a stator core, an insulation support and a stator winding, the insulation support is an injection-molded part and injection-molded around the stator core, the stator winding is mounted on the insulation support, and the shell is an injection-molded body and injection-molded around the stator assembly.

15. A thermal management system, characterized by, The electronic water pump according to any one of claims 1-14.

16. A vehicle characterized by comprising: The electronic water pump according to any one of claims 1-14 or the thermal management system according to claim 15.

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