Electronic water pump, thermal management system with same and vehicle

Abstract

The utility model discloses an electronic water pump and a thermal management system and a vehicle with the electronic water pump, the electronic water pump comprises a pump shell, the pump shell comprises a shell main body and a first support, the shell main body is internally provided with a rotor cavity, the first support is connected with the shell main body through injection molding, and a first communication channel is formed on the first support; an impeller cavity is formed in the pump cover, and one axial end of the rotor cavity is communicated with the impeller cavity; the pump shaft is supported between the first support and the pump cover and connected with the first support in an injection molding mode, and a second communication channel is formed in the pump shaft so that the part, located between the rotor assembly and the first support, of the rotor cavity can communicate with the impeller cavity through the first communication channel and the second communication channel. The heat dissipation plate is connected with the pump shell in a sealed mode. According to the electronic water pump, liquid can circularly flow in the rotor cavity and the impeller cavity, heat on the heat dissipation plate can be taken away when the liquid circularly flows, and heat dissipation of the controller is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to water pump technical field, specifically, electronic water pump and having 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 large, and the cost is high. SUMMARY

[0003] The utility model discloses at least solve one of the prior art technical problems. To this end, the utility model provides an electronic water pump, liquid in the electronic water pump can circulate in the rotor cavity, impeller cavity, and the liquid circulation can take away the heat on the heat dissipation plate, realize the heat dissipation of controller, so as to no longer rely on the heat dissipation of pump shell, improve the heat dissipation effect, and the material of pump shell is not limited, facilitate to reduce 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: pump shell, the pump shell includes shell main body and first support, the shell main body has rotor cavity in, the first support is located in the rotor cavity and is connected with the shell main body injection, the first support is formed with the first communication channel that communicates the axial both sides of the first support;Pump cover, the pump cover cover is located in the axial one end of the pump shell, and the pump cover has impeller cavity in, and the axial one end of the rotor cavity is communicated with the impeller cavity;Rotor assembly, the rotor assembly rotatably is located in the rotor cavity and is located in the first support towards the one side of the pump cover;Pump shaft, the pump shaft is supported between the first support and the pump cover and is connected with the first support injection, the pump shaft is arranged in the rotor assembly and is rotated with the rotor assembly cooperation, the second communication channel is formed on the pump shaft, so that the part of the rotor cavity between the rotor assembly and the first support is communicated with the impeller cavity through the first communication channel and the second communication channel;Heat dissipation plate, the heat dissipation plate cover is located in the axial other end of the pump shell, and is connected with the pump shell seal, and the first support and the pump shaft are spaced apart from the heat dissipation plate in the axial direction;Controller, the controller is located in the heat dissipation plate's side away from the rotor cavity, and is in thermal contact with the heat dissipation plate.

[0007] The liquid in the electronic water pump can circulate and flow in the rotor cavity and the impeller cavity, the liquid can take away the heat on the heat dissipation plate when circulating and flowing, heat dissipation of the controller is realized, heat dissipation is no longer relied on the pump shell, the heat dissipation effect is improved, and the material of the pump shell is not limited, so that the cost is reduced.

[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 first support is formed as a plate-shaped structure and is sleeved outside the pump shaft, and the first communication passage penetrates the first support in the axial direction.

[0010] According to some optional embodiments of the utility model, the first support includes a first connecting piece and a plurality of second connecting pieces arranged in a circumferential direction, the electronic water pump further includes a stator assembly, the shell main body is an injection molded body and injection molded to wrap the stator assembly, the stator assembly includes a stator core, an insulating support and a stator winding, the insulating support is an injection molded piece and injection molded to wrap the stator core, the stator winding is installed on the insulating support, the stator core includes a plurality of stator tooth portions arranged in an axial direction, and the second connecting pieces are connected to portions of the shell main body corresponding to spaces between adjacent two stator tooth portions.

[0011] According to some embodiments of the utility model, the axial minimum distance between the first support and the pump shaft and the heat dissipation plate is x, and 0.8mm≤x≤1.2mm.

[0012] According to some embodiments of the utility model, the pump cover is formed with a medium inlet and a medium outlet in communication with the impeller cavity, one end of the second communication passage away from the heat dissipation plate is arranged adjacent to the medium inlet, the axial one end of the rotor cavity is arranged radially adjacent to the medium outlet at a position in communication with the impeller cavity, a flow control hole in communication with the medium inlet is arranged on a downstream side of the second communication passage, the flow control hole is formed on the pump shaft or the pump cover, and an opening area of the flow control hole is smaller than a flow area of the second communication passage.

[0013] According to some optional embodiments of the utility model, the pump cover includes cover main part and second support, the medium import and the medium export all form on the cover main part, the second support is equipped with at the medium import and is connected with the pump shaft plug, the flow control hole forms on the second support.

[0014] According to some embodiments of the utility model, the first connecting structure is integrally arranged on the shell main body, the first connecting structure is arranged through the heat dissipation plate, and the first connecting structure is riveted to the heat dissipation plate, a sealing element is arranged between the heat dissipation plate and the shell main body, and the sealing element is clamped between the shell main body and the heat dissipation plate in the axial direction of the pump shaft, or the sealing element is clamped between the shell main body and the heat dissipation plate in the radial direction of the pump shaft.

[0015] According to some optional embodiments of the utility model, one end of the shell main body is formed with a matching groove, and the heat dissipation plate is matched with the matching groove, and / or one side of the heat dissipation plate facing the pump cover has a matching part, the matching part extends into the rotor cavity, an installation groove is formed on the outer peripheral wall of the matching part, and the sealing element is arranged in the installation groove.

[0016] According to some 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 one side of the plate body part facing the rotor cavity, the plurality of heat dissipation fins are arranged on the outer peripheral side of the pump shaft in a circumferential direction, and each heat dissipation fin extends in a radial direction in a straight line or a curve.

[0017] According to some embodiments of the utility model, a bearing is arranged between the pump shaft and the rotor assembly, the pump shaft includes a first shaft segment, a second shaft segment and a third shaft segment arranged in sequence in an axial direction, the first shaft segment and the third shaft segment are respectively rotatably connected with the bearing, and the outer peripheral 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 pump cover is formed with a medium inlet and a medium outlet which communicate with the impeller cavity, the rotor assembly comprises a rotor core, a rotor insulating part and a plurality of permanent magnets, the plurality of permanent magnets are circumferentially spaced apart on the rotor core, the rotor insulating part injection-molds the rotor core and the permanent magnets and injection-molds the rotor core and the permanent magnets, the outer peripheral wall of the rotor core is exposed to the rotor insulating part, the impeller and the rotor insulating part 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 formed with an impeller inlet opposite to the medium inlet, the gap between the radial outer end of the first end plate and the radial outer end of the second end plate is formed into an impeller outlet, the axial dimension of the impeller outlet is H, the axial dimension of the end face of the first end plate towards the second end plate is Y1, the axial dimension of the end face of the second end plate towards the 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 comprises a circuit board and electronic devices, heat-conducting glue is arranged between the circuit board and the heat dissipation plate, all the electronic devices are arranged on the side of the circuit board away from the heat dissipation plate, a second connecting structure is integrally arranged on the shell main body, the second connecting structure is arranged on the outer peripheral side of the heat dissipation plate and penetrates the circuit board, and the second connecting structure is hot rivet connected 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 part and a plurality of head parts, the plurality of head parts are spaced apart on one length end of the connecting part along the width direction of the connecting part and are inserted into the same insertion hole on the circuit board, each head part is formed with an elastic hole and the width of the head part increases first and then decreases along the length direction of the connecting part, and the thickness of the connecting terminal is greater than or equal to 0.8mm.

[0020] According to some embodiments of the utility model, electronic water pump still include: back cover, back cover set in the shell main body's one end away from pump cover, and with shell main body, heat dissipation plate define electric control cavity, controller set in electric control cavity, back cover is configured to satisfy at least one of following conditions: condition A1, the inner wall surface of back cover opposite with controller convex has reinforcing structure, reinforcing structure includes a plurality of first rib along the first direction interval arrangement and a plurality of second rib along the second direction interval arrangement, every first rib along the second direction linear extension, every second rib along the first direction linear extension, first rib and second rib cross arrangement, the first direction and the second direction all with the axial direction of pump shaft vertical;Condition A2, be equipped with connection terminal on the controller, connection terminal passes out back cover and with back cover injection connection, the inner wall surface and / or outer wall surface of back cover form has glue groove, glue groove surrounds connection terminal arrangement, and glue groove is equipped with cemented sealing piece;Condition A3, back cover and shell main body welding fixed, the outer wall of back cover is equipped with welding positioning hole;Condition A4, back cover includes apron and bottom plate, apron surrounds connection in the outer periphery of bottom plate and with shell main body fixed, bottom plate includes first wall part and second wall part opposite along the first direction, in the axial direction of pump shaft, the distance between first wall part and shell main body is less than the distance between second wall part and shell main body, be equipped with connection terminal on the controller, connection terminal passes through and is equipped with first wall part, the first direction with the axial direction of pump shaft vertical.

[0021] According to the second aspect of the utility model, a thermal management system is provided, which comprises the electronic water pump according to the first aspect of the utility model.

[0022] According to the thermal management system of the utility model, the liquid in the electronic water pump can circulate in the rotor cavity and the impeller cavity, and the liquid circulation can take away the heat on the heat dissipation plate to realize the heat dissipation of the controller. Thus, the heat dissipation is no longer dependent on the pump shell, the heat dissipation effect is improved, and the material of the pump shell is not limited, thereby reducing the cost.

[0023] According to the third aspect of the utility model, a vehicle is provided, which comprises the thermal management system according to the second aspect of the utility model or the electronic water pump according to the first aspect of the utility model.

[0024] According to the heat management system of the embodiment of the present application, the liquid in the electronic water pump can circulate and flow in the rotor cavity and the impeller cavity, the liquid can take away the heat on the heat dissipation plate when circulating and flowing, and the heat dissipation of the controller is realized, so that the heat dissipation is no longer relied on the pump shell, the heat dissipation effect is improved, and the material of the pump shell is not limited, so that the cost is reduced.

[0025] 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

[0026] 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:

[0027] Figure 1 is a structural schematic view of the electronic water pump according to the embodiment of the present application;

[0028] Figure 2 is a sectional view of the electronic water pump according to the embodiment of the present application;

[0029] Figure 3 is a structural schematic view of the heat dissipation plate according to the embodiment of the present application;

[0030] Figure 4 is a structural schematic view of the heat dissipation plate according to the embodiment of the present application;

[0031] Figure 5 is a structural schematic view of the heat dissipation plate according to the embodiment of the present application;

[0032] Figure 6 is a partial structural sectional view of the electronic water pump according to the embodiment of the present application;

[0033] Figure 7 is a partial structural sectional view of the electronic water pump according to the embodiment of the present application;

[0034] Figure 8 is a structural sectional view of the electronic water pump according to the embodiment of the present application;

[0035] Figure 9 is a schematic view of the pump shaft, the first support and other structures of the electronic water pump according to the embodiment of the present application;

[0036] Figure 10 is a schematic view of the pump shaft, the first support and other structures of the electronic water pump according to the embodiment of the present application;

[0037] Figure 11 is a structural schematic view of a pump shaft according to an embodiment of the present application;

[0038] Figure 12 is a structural schematic view of an impeller and a rotor assembly according to an embodiment of the present application;

[0039] Figure 13 is a structural schematic view of a circuit board according to an embodiment of the present application;

[0040] Figure 14 is a structural schematic view of a rear cover according to an embodiment of the present application;

[0041] Figure 15 is a structural schematic view of a rear cover according to an embodiment of the present application;

[0042] Figure 16 is a structural schematic view of a connecting terminal according to an embodiment of the present application;

[0043] Figure 17 is a structural schematic view of a vehicle according to an embodiment of the present application.

[0044] Reference signs: 1000, vehicle; 1, electronic water pump;

[0045] 10, shell main body; 11, rotor cavity; 13, second connecting structure; 14, groove part; 17, matching groove;

[0046] 20, pump cover; 21, cover main body; 211, medium inlet; 212, medium outlet; 213, impeller cavity; 22, second support; 221, flow control hole;

[0047] 30, impeller; 31, first end plate; 32, second end plate; 321, impeller inlet; 33, blade; 34, impeller outlet;

[0048] 40, motor; 41, stator assembly; 411, stator core; 4111, stator tooth part; 412, insulation support; 413, stator winding; 42, rotor assembly; 421, rotor core; 422, rotor insulation; 423, permanent magnet;

[0049] 50, heat dissipation plate; 55, first connecting hole; 57, matching part; 571, mounting groove;

[0050] 61, circuit board; 611, second connecting hole; 612, plug-in hole;

[0051] 70, pump shaft; 701, first shaft section; 702, second shaft section; 703, third shaft section; 71, second communication channel;

[0052] 80. First bracket; 81. First connector; 82. Second connector;

[0053] 91. Seal; 92. Bearing; 93. Connecting terminal; 931. Connecting part; 932. Head; 933. Resilient hole;

[0054] 94. Rear cover; 941. Electrical control cavity; 942. Glue groove; 943. Welding positioning hole; 945. Enclosure plate; 946. Base plate; 9461. First wall section; 9462. Second wall section;

[0055] 95. Strengthen the structure; 951. First stiffener; 952. Second stiffener. Detailed Implementation

[0056] 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.

[0057] The electronic water pump 1 according to an embodiment of the present invention is described below with reference to the accompanying drawings.

[0058] like Figures 1-7 As shown, the electronic water pump 1 according to an embodiment of the present invention includes a pump casing, a pump cover 20, a rotor assembly 42, a pump shaft 70, a heat sink 50, and a controller.

[0059] The pump casing includes a casing body 10 and a first support 80. The casing body 10 has a rotor cavity 11. A pump cover 20 is installed on one axial end of the pump casing and has an impeller cavity 213 inside the pump cover 20. One axial end of the rotor cavity 11 is connected to the impeller cavity 213. The rotor assembly 42 is rotatably disposed in the rotor cavity 11 and is located on the side of the first support 80 facing the pump cover 20.

[0060] When the rotor assembly 42 is driven to rotate, the rotor assembly 42 will drive the impeller 30 to rotate, causing the impeller 30 to rotate within the impeller cavity 213. At this time, the impeller 30 can drive the liquid to flow from the liquid entering the impeller cavity 213 to the designated position.

[0061] The heat sink 50 is covered at the other axial end of the pump casing and is sealed to the pump casing. The controller is located on the side of the heat sink 50 away from the rotor cavity 11 and is thermally connected with the heat sink 50 so that the heat sink 50 can dissipate the heat on the controller and prevent the temperature on the controller from being too high, which would affect the working efficiency of the controller.

[0062] In addition, the heat dissipation plate 50 is sealingly connected with the pump shell, so that the liquid in the rotor cavity 11 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.

[0063] The pump shaft 70 is arranged through the rotor assembly 42 and rotationally connected with the rotor assembly 42. The pump shaft 70 can support the rotation of the rotor assembly 42 and limit the swing range of the rotor assembly 42, so as to ensure the stable rotation of the rotor assembly 42.

[0064] The first support 80 is arranged in the rotor cavity 11 and injection-molded with the shell main body 10. The first support 80 is formed with a first communication channel communicating between the two axial sides of the first support 80. The pump shaft 70 is formed with a second communication channel 71. The part of the rotor cavity 11 between the rotor assembly 42 and the first support 80 is communicated with the impeller cavity 213 through the first communication channel and the second communication channel 71. Therefore, the liquid between the rotor assembly 42 and the first support 80 can flow to the impeller cavity 213 through the first communication channel and the second communication channel 71, or the liquid in the second communication channel 71 can flow to the part between the rotor assembly 42 and the first support 80 through the first communication channel, so as to realize the circulation of the liquid between the impeller cavity 213 and the rotor cavity 11.

[0065] In this way, when the liquid flows through the rotor cavity 11, the liquid can take away the heat on the heat dissipation plate 50, so as to fully dissipate the heat of the controller and reduce the influence of the heat on the working efficiency of the controller.

[0066] Specifically, in some embodiments, when the rotor assembly 42 drives the impeller 30 to rotate, part of the liquid in the impeller cavity 213 flows to the specified area, and the other part flows to the rotor cavity 11 and flows to the heat dissipation plate 50 through the gap between the rotor assembly 42 and the first support 80, enters the first communication channel after flowing through the heat dissipation plate 50, and flows to the impeller cavity 213 through the second communication channel 71, so as to realize the circulation of the liquid between the impeller cavity 213 and the rotor cavity 11. When the liquid flows through the heat dissipation plate 50, the heat on the heat dissipation plate 50 can be taken away, thereby effectively dissipating the heat of the controller and the rotor cavity 11.

[0067] In other embodiments, when the rotor assembly 42 drives the impeller 30 to rotate, part of the liquid in the impeller cavity 213 flows to the specified area, and the other part flows to the heat dissipation plate 50 at the other end of the rotor cavity 11 through the second communication channel 71 and the first communication channel, and enters the rotor cavity 11. The liquid in the rotor cavity 11 flows to the impeller cavity 213 through the gap between the rotor assembly 42 and the first support 80, so as to realize the circulation of the liquid between the impeller cavity 213 and the rotor cavity 11. When the liquid flows through the heat dissipation plate 50, the heat on the heat dissipation plate 50 can be taken away, thereby effectively dissipating the heat of the controller.

[0068] The first support 80 is injection molded with the shell body 10 and the first support 80 is injection molded with the pump shaft 70 to connect the pump shaft 70 and the shell body 10 by the first support 80, to fix the end of the pump shaft 70 by the first support 80, to stably arrange the pump shaft 70 in the rotor assembly 42, to enable the pump shaft 70 to bear the force of the rotor assembly 42, and to enable the pump shaft 70 to stably support the rotation of the rotor assembly 42 and limit the swing range of the rotor assembly 42.

[0069] The first support 80 and the pump shaft 70 are axially spaced from the heat dissipation plate 50 to avoid the heat dissipation plate 50 from blocking the end of the first communication passage and the second communication passage 71, to ensure that the liquid in the rotor cavity 11 can smoothly enter the first communication passage and the second communication passage 71, or the liquid in the first communication passage and the second communication passage 71 can smoothly enter the rotor cavity 11, to enable the liquid to circulate in the impeller cavity 213 and the rotor cavity 11, and to take away the heat on the heat dissipation plate 50 to cool the heat dissipation plate 50 and the controller.

[0070] Therefore, the liquid in the electronic water pump 1 according to the embodiment of the present application can circulate in the rotor cavity 11 and the impeller cavity 213, the liquid can take away the heat on the heat dissipation plate 50 when circulating, the heat dissipation of the controller is realized, the heat dissipation relies on the pump shell, the heat dissipation effect is improved, and the material of the pump shell is not limited, so that the cost is reduced.

[0071] The electronic water pump 1 according to the embodiment of the present application will be described below with reference to the accompanying drawings.

[0072] In some embodiments of the present application, as shown in Figures 1-7 The electronic water pump 1 comprises a pump shell, a pump cover 20, a rotor assembly 42, a pump shaft 70, a heat dissipation plate 50, and a controller.

[0073] In some embodiments of the present application, the first support 80 is formed as a plate structure, so as to control the size of the first support 80 in the axial direction of the pump shaft 70 and reduce the space occupied by the first support 80 in the axial direction of the pump shaft 70. The first support 80 is sleeved on the pump shaft 70 to facilitate the communication between the first communication passage and the second communication passage 71, to facilitate the injection molding of the first support 80 and the pump shaft 70, and to support the end of the pump shaft 70 in the axial direction by the shell body 10 and the first support 80.

[0074] The first communication passage penetrates the first support 80 in the axial direction to communicate the rotor cavity 11 and the second communication passage 71 by the first communication passage, and to enable the liquid to circulate in the rotor cavity 11 and the impeller cavity 213.

[0075] In other embodiments of this utility model, such as Figure 7 , Figure 9 and Figure 10 As shown, the first bracket 80 includes a first connector 81 and a plurality of second connectors 82 spaced apart along the circumference. The first connector 81 is sleeved on the outside of the pump shaft 70. Each second connector 82 connects the outer peripheral wall of the first connector 81 and the inner peripheral wall of the shell body 10. The second connectors 82 connect the first connector 81 and the inner peripheral wall of the shell body 10 to fix the first bracket 80 in the rotor cavity 11. This allows the first bracket 80 to support the axial end of the pump shaft 70, enabling the pump shaft 70 to support the rotation of the rotor assembly 42, while limiting the sway amplitude of the rotor assembly 42 and ensuring the stable rotation of the rotor assembly 42.

[0076] The interval between two adjacent second connectors 82 defines a first connecting channel, which connects the rotor cavity 11 and the second connecting channel 71, thereby enabling the liquid to circulate within the rotor cavity 11 and the impeller cavity 213.

[0077] In some embodiments, the first connecting channel includes a first flow channel and a second flow channel. A first connector 81 defines the first flow channel, which extends axially along the pump shaft 70. Two adjacent second connectors 82 spaced apart define a portion of the first connecting channel, namely the second flow channel, which extends radially along the pump shaft 70. The first and second flow channels connect the radially outer side of the first support 80 and the second connecting channel 71, thereby connecting the rotor cavity 11 and the impeller cavity 213. This allows the liquid to circulate within the impeller cavity 213 and the rotor cavity 11, thereby carrying away heat from the heat sink 50 and cooling the heat sink 50 and the controller.

[0078] In some optional embodiments of this utility model, such as Figures 7-9 As shown, the first bracket 80 includes a first connector 81 and a plurality of second connectors 82 arranged circumferentially. The electronic water pump 1 also includes a stator assembly 41. The housing body 10 is an injection molded body and the stator assembly 41 is injection molded.

[0079] The stator assembly 41 includes a stator core 411, an insulating bracket 412, and a stator winding 413. The insulating bracket 412 is an injection-molded part and the injection-molded part encapsulates the stator core 411. The stator winding 413 is mounted on the insulating bracket 412 to injection-mold and connect the housing body 10 and the stator assembly 41 together.

[0080] The stator assembly 41 and the rotor assembly 42 are coupled together. When the rotor assembly 42 is subjected to a force, the rotor assembly 42 rotates and drives the impeller 30 to rotate, thereby driving the flow of liquid.

[0081] The stator core 411 comprises a plurality of stator tooth portions 4111 arranged at intervals in the axial direction, and the second connecting member 82 is connected to the portion of the shell main body 10 corresponding to the portion between the adjacent two stator tooth portions 4111, so as to connect the second connecting member 82 to the portion with a relatively large wall thickness in the shell main body 10, thereby facilitating the fixed connection of the shell main body 10 and the second connecting member 82, and facilitating the fixed connection of the first support 80 in the rotor cavity 11.

[0082] In some examples, as shown in Figure 8 In order to facilitate the molding, a groove portion 14 is arranged on the portion of the shell main body 10 between the adjacent two stator tooth portions 4111, and the groove portion 14 extends in the axial direction of the shell main body 10, so as to reduce the wall thickness difference between the portion of the shell main body 10 located on the inner circumferential wall of the stator assembly 41 and the portion of the shell main body 10 located between the adjacent two stator tooth portions 4111, thereby facilitating the integral molding of the shell main body 10.

[0083] In some examples, as shown in Figure 2 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 shell main body 10, thereby fixing the position of the first support 80, and fixing the end portion of the shell main body 10 by the first support 80.

[0084] In some specific examples, the shell main body 10 is injection molded, so that the shell main body 10 is a plastic part, and the circulation of the liquid in the rotor cavity 11 and the impeller cavity 213 is used for heat dissipation, thereby reducing the cost by about 20%.

[0085] In some examples, as shown in Figure 8 The stator core 411 comprises a plurality of stator tooth portions 4111 arranged at intervals in the axial direction, and the second connecting member 82 is connected to the portion of the shell main body 10 corresponding to the portion between the adjacent two stator tooth portions 4111, so as to connect the second connecting member 82 to the portion with a relatively large wall thickness in the shell main body 10, thereby facilitating the fixed connection of the shell main body 10 and the second connecting member 82, and facilitating the fixed connection of the first support 80 in the rotor cavity 11.

[0086] In some examples, as shown in

[0087] In some examples, as shown in Figure 2As shown, the axial minimum distance between the first support 80 and the pump shaft 70 and the heat sink 50 is x, 0.8mm≤x≤1.2mm, so that the first support 80 and the pump shaft 70 are spaced apart from the heat sink 50, and thus the liquid in the rotor cavity 11 can smoothly enter the first and second communication channels 71, to achieve the circulating flow of the liquid in the rotor cavity 11 and the impeller cavity 213.

[0088] In some embodiments, the axial minimum distance between the first support 80 and the pump shaft 70 and the heat sink 50 can be 0.8mm, 0.9mm, 1mm, 1.1mm or 1.2mm, which is not limited here.

[0089] In some embodiments of the present application, as shown in Figure 1 、 Figure 2 The pump cover 20 is formed with a medium inlet 211 and a medium outlet 212 which communicate with the impeller cavity 213, the end of the second communication channel 71 away from the heat sink 50 is adjacent to the medium inlet 211, and the axial end of the rotor cavity 11 which communicates with the impeller cavity 213 is radially adjacent to the medium outlet 212, the rotation of the impeller 30 drives the liquid to enter the impeller cavity 213 from the medium inlet 211, and drives the liquid in the impeller cavity 213 to flow out from the medium outlet 212, thus forming a negative pressure 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.

[0090] The end of the second communication channel 71 away from the heat sink 50 is adjacent to the medium inlet 211, and the axial end of the rotor cavity 11 which communicates with the impeller cavity 213 is radially adjacent to the medium outlet 212, thus, under the action of pressure, part of the liquid in the impeller cavity 213 will flow to the designated area from the medium outlet 212, and part of the liquid will flow into the rotor cavity 11, and then enter the second communication channel 71 through the first communication channel after flowing through the heat sink 50, and since the pressure at the medium inlet 211 is smaller, the liquid in the second communication channel 71 can smoothly enter the impeller cavity 213 under the action of pressure difference, thus achieving the circulating flow of the liquid in the rotor cavity 11 and the impeller cavity 213, to achieve heat dissipation of the heat sink 50.

[0091] In some embodiments, by this way of heat dissipation of the heat sink 50 and the controller, the heat dissipation effect is good, so that the electronic water pump 1 can stably operate at an ambient temperature of 135℃ and a medium temperature of 120℃.

[0092] The downstream side of the second communication passage 71 is provided with a flow control hole 221 communicated with the medium inlet 211, the flow control hole 221 is formed on the pump shaft 70 or the pump cover 20, the opening area of the flow control hole 221 is smaller than the flow area of the second communication passage 71, so as to control the flow entering the second communication passage 71, and then control the flow of the liquid entering the rotor cavity 11, and reduce the influence on the flow of the liquid at the medium outlet 212.

[0093] In some optional embodiments of the utility model, as shown in Figure 2 The pump cover 20 includes a cover main body 21 and a second support 22, the medium inlet 211 and the medium outlet 212 are formed on the cover main body 21, the second support 22 is arranged at the medium inlet 211 and is inserted and matched with the pump shaft 70, so as to fix one end of the pump shaft 70 in the axial direction, and then limit the position of the pump shaft 70, stably penetrate the pump shaft 70 in the rotor assembly 42, so that the pump shaft 70 can bear the acting force of the rotor assembly 42, and then the pump shaft 70 can stably support the rotation of the rotor assembly 42, and limit the shaking amplitude of the rotor assembly 42.

[0094] The flow control hole 221 is formed on the second support 22, specifically, the structure of the second support 22 is simpler, so that the flow control hole 221 is formed on the second support 22, which is convenient for molding and reduces the processing difficulty.

[0095] In some embodiments of the utility model, the first connecting structure is integrally arranged on the shell main body 10, penetrates the heat dissipation plate 50, and is hot riveted on the heat dissipation plate 50, so as to fixedly connect the shell main body 10 and the heat dissipation plate 50 together.

[0096] In some embodiments, as shown in Figure 3 , Figure 4 The heat dissipation plate 50 is provided with a first connecting hole 55, the first connecting structure is adapted to pass through the first connecting hole 55, then the part of the first connecting structure passing through the first connecting hole 55 is hot riveted, so as to form a first abutting portion at the end of the first connecting structure, the heat dissipation plate 50 is clamped between the first abutting portion and the shell main body 10, and then the heat dissipation plate 50 and the shell main body 10 are fixedly connected together.

[0097] In some optional embodiments of the utility model, the sealing piece 91 is arranged between the heat dissipation plate 50 and the shell main body 10 in the axial direction of the pump shaft 70, so as to seal the gap between the shell main body 10 and the heat dissipation plate 50, and reduce the possibility that the liquid in the rotor cavity 11 flows to the control piece.

[0098] The fixing force between the first connecting structure and the heat sink 50 extends along the axial direction of the pump shaft 70, clamping the seal 91 between the housing body 10 and the heat sink 50 in the axial direction of the pump shaft 70. This facilitates the use of the force between the first connecting structure and the heat sink 50 to clamp the seal 91, enabling the seal 91 to fully seal the gap between the heat sink 50 and the housing body 10.

[0099] In some other optional embodiments of this utility model, such as Figure 7 As shown, a sealing element 91 is provided between the heat dissipation plate 50 and the housing body 10. The sealing element 91 is sandwiched between the housing body 10 and the heat dissipation plate 50 in the radial direction of the pump shaft 70 to seal the gap between the housing body 10 and the heat dissipation plate 50, thereby reducing the possibility that the liquid in the rotor cavity 11 will flow to the control component.

[0100] The fixing force between the first connecting structure and the heat sink 50 extends along the axial direction of the pump shaft 70, clamping the seal 91 between the housing body 10 and the heat sink 50 in the radial direction of the pump shaft 70. This avoids reducing the axial force exerted by the seal 91 on the first connecting structure and the heat sink 50, and reduces the axial force exerted on the first connecting structure and the heat sink 50 away from each other, thereby improving the stability of the connection between the first connecting structure and the heat sink 50.

[0101] In some specific embodiments of this utility model, such as Figure 2 As shown, a mating groove 17 is formed at one end of the shell body 10, and the heat sink 50 is mated in the mating groove 17 to reserve space for the heat sink 50 on the shell body 10. This makes it easier to improve assembly efficiency and accuracy when the heat sink 50 is installed on the shell body 10.

[0102] In some specific embodiments of this utility model, such as Figure 2 , Figure 3 As shown, the heat sink 50 has a mating part 57 on the side facing the pump cover 20. The mating part 57 extends into the rotor cavity 11. An installation groove 571 is formed on the outer peripheral wall of the mating part 57. The sealing member 91 is provided in the installation groove 571 so as to limit the position of the sealing member 91, so that the sealing member 91 can stably seal the gap between the heat sink 50 and the housing body 10, reducing the possibility that the sealing member 91 will fall out from between the heat sink 50 and the housing body 10.

[0103] In some embodiments of the utility model, the heat dissipation plate 50 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 rotor cavity 11, and the plurality of heat dissipation fins are arranged on the outer circumferential side of the pump shaft 70 in a circumferential direction. The heat dissipation fins increase the heat dissipation area of the heat dissipation plate 50, and the heat dissipation fins are arranged on the side of the plate body part facing the rotor cavity 11, so that the area of the heat dissipation plate 50 in contact with the liquid is increased, and the heat dissipation efficiency of the heat dissipation plate 50 is improved, thereby improving the heat dissipation effect of the controller.

[0104] Each heat dissipation fin extends in a radial direction in a straight line or a curve, so that the plurality of heat dissipation fins are arranged on the heat dissipation plate 50 in a reasonable manner, and the plurality of heat dissipation fins improve the heat dissipation efficiency of the heat dissipation plate 50.

[0105] In some embodiments, the heat dissipation fins extend in a radial direction in a curve, and the plurality of heat dissipation fins are arranged in a circumferential direction on the heat dissipation plate 50.

[0106] When the impeller 30 rotates and drives the liquid into the impeller cavity 213, part of the liquid flows to the designated area, part of the liquid flows to the end of the rotor cavity 11 through the gap between the rotor assembly 42 and the stator assembly 41, and then flows to the outer end area of the heat dissipation plate 50. The liquid flows along the first communication channel to the second communication channel 71, and then flows into the impeller cavity 213 along the second communication channel 71.

[0107] The bending direction of the heat dissipation fin is matched with the rotation direction of the impeller 30, so that when the impeller 30 rotates, a driving force can be generated to enable the liquid in the outer side area of the first support 80 to flow smoothly to the first communication channel and the second communication channel 71, so as to smoothly take away the heat on the heat dissipation plate 50 and flow to the impeller cavity 213.

[0108] In some embodiments of the utility model, as shown in Figure 2 , Figure 11 A bearing 92 is arranged between the pump shaft 70 and the rotor assembly 42, the bearing 92 is located between the pump shaft 70 and the rotor assembly 42, and the bearing 92 is in rotational cooperation with the pump shaft 70, so as to reduce the wear between the pump shaft 70 and the rotor assembly 42, and thereby improve the service life of the electronic water pump 1.

[0109] The pump shaft 70 includes a first shaft segment 701, a second shaft segment 702 and a third shaft segment 703 arranged in sequence in an axial direction, the first shaft segment 701 and the third shaft segment 703 are respectively in rotational cooperation with the bearing 92, and the outer circumferential wall of the second shaft segment 702 is recessed relative to the first shaft segment 701 and the third shaft segment 703. This reduces the contact area between the bearing 92 and the pump shaft 70, and thereby reduces the wear between the pump shaft 70 and the bearing 92.

[0110] The first shaft section 701 and the third shaft section 703 are located at two ends of the pump 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.

[0111] In some embodiments, the rotor assembly 42 is in interference fit with the outer peripheral wall of the bearing 92, and when the rotor assembly 42 rotates, the rotor assembly 42 drives the bearing 92 to rotate, and at this time, the bearing 92 rotates relative to the pump shaft 70 to limit the swing of the bearing 92 and the rotor assembly 42 by the pump shaft 70, so that the rotor assembly 42 can stably rotate.

[0112] In some embodiments, the first shaft section 701 is fixedly fitted with the pump cover 20, and the third shaft section 703 is spaced from the heat dissipation plate 50 and fixedly fitted with the first support 80 to fix two ends of the pump shaft 70 in the axial direction, thereby stably supporting the rotation of the bearing 92 and the rotor assembly 42 by the pump shaft 70 and limiting the swing of the bearing 92 and the rotor assembly 42.

[0113] In some examples, as shown in Figure 2 The pump cover 20 includes a cover body 21 and a second support 22, the cover body 21 defines an impeller cavity 213, a medium inlet 211 and a medium outlet 212, the second support 22 is located on a side of the medium inlet 211 facing the first mounting cavity 11, and at least part of the second support 22 is located in the impeller cavity 213.

[0114] The second support 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 support 22.

[0115] 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 pump 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.

[0116] In some embodiments of the utility model, as shown in Figure 12As shown, the pump cover 20 is formed with a medium inlet 211 and a medium outlet 212 which are communicated with the impeller cavity 213, the rotor assembly 42 comprises a rotor core 421, a rotor insulating member 422 and a plurality of permanent magnets 423, the plurality of permanent magnets 423 are arranged on the rotor core 421 in a circumferential direction, and the rotor insulating member 422 is injection-molded to wrap and connect the rotor core 421 and the permanent magnets 423, the outer circumferential wall of the rotor core 421 is exposed to the rotor insulating member 422, and the impeller 30 and the rotor insulating member 422 are an integral injection-molded part, when the rotor assembly 42 rotates, the rotor assembly 42 directly drives the impeller 30 to rotate through the rotor insulating member 422.

[0117] 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 facing the second end plate 32 is Y1, the axial dimension of the end face of the second end plate 32 facing 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.

[0118] Specifically, H is greater than or equal to Y1, and H is greater than or equal to Y2, so as 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, thereby enabling the first end plate 31, the second end plate 32 and the plurality of blades 33 to be integrally formed.

[0119] It should be explained here that when the end face of the first end plate 31 facing the second end plate 32 extends in a horizontal direction, Y1 is 0. When the end face of the second end plate 32 facing the first end plate 31 extends in a horizontal direction, Y2 is 0.

[0120] 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 plurality of blades 33 and the second end plate 32 do not need to be assembled and fixed, thereby facilitating to reduce the processing steps, reduce the processing difficulty and reduce the processing cost.

[0121] 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, thereby facilitating 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.

[0122] 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.

[0123] In some embodiments, 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.

[0124] 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 42, the mold is moved outward under the action of centrifugal force, thereby realizing demolding.

[0125] In some embodiments, 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.

[0126] In some embodiments, 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 as to ensure that the second mold can be smoothly demolded.

[0127] 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 as to reduce the gap between the rotor core 421 and the stator core 411, and reduce the air gap of the motor 40, so as to improve the efficiency of the motor 40 by about 3%, and reduce the manufacturing cost by about 10%.

[0128] In some embodiments of the utility model, the controller includes circuit board 61 and electronic device, and heat-conducting glue is arranged between circuit board 61 and heat dissipation plate 50, all electronic devices are arranged on the side of circuit board 61 away from heat dissipation plate 50, so that the shape of the side of circuit board 61 facing heat dissipation plate 50 is not restricted by electronic devices, for example, it is convenient to form a plane or other surface on the side of circuit board 61 facing heat dissipation plate 50, the heat-conducting glue is convenient to connect heat dissipation plate 50 and circuit board 61, so that the heat on circuit board 61 can be transmitted to heat dissipation plate 50 through the heat-conducting glue, and heat dissipation plate 50 is utilized to dissipate heat on circuit board 61.

[0129] All electronic devices are arranged on the side of circuit board 61 away from heat dissipation plate 50, so that only one side of circuit board 61 needs to be arranged and manufactured, half of the processing steps are reduced, and the process cost is reduced.

[0130] In some embodiments, as shown in Figure 6 , As shown in Figure 13 , the shell body 10 is integrally provided with the second connecting structure 13, the second connecting structure 13 is arranged on the outer peripheral side of the heat dissipation plate 50 and penetrates the circuit board 61, the second connecting structure 13 is hot riveting connected to the circuit board 61, so as to fixedly connect the heat dissipation plate 50 and the circuit board 61 together, and the connection strength of the heat dissipation plate 50 and the circuit board 61 is improved.

[0131] Specifically, the second connecting structure 13 is utilized to fixedly connect the heat dissipation plate 50 and the circuit board 61 together, and the processing step of screw locking is cancelled, so as to reduce the cost. Moreover, compared with the inverted buckle structure, the hot riveting fixing has smaller volume and lower requirement.

[0132] In some examples, as shown in Figure 13 , the second connecting hole 611 is arranged at the region without circuit of the circuit board 61, the second connecting structure 13 is adapted to penetrate the second connecting hole 611, and the hot riveting processing is performed on the end of the second connecting structure 13 penetrating the second connecting hole 611, so as to form the second abutting portion at the end of the second connecting structure 13 penetrating the second connecting hole 611, and then the circuit board 61 is clamped between the heat dissipation plate 50 and the second abutting portion, so as to fixedly connect the heat dissipation plate 50 and the circuit board 61 together.

[0133] In some embodiments, as shown in Figures 13-16 , the electronic water pump 1 further comprises a connecting terminal 93, the connecting terminal 93 is a sheet structure and comprises a connecting portion 931 and a plurality of head portions 932, the plurality of head portions 932 are arranged at one end of the length of the connecting portion 931 along the width direction of the connecting portion 931 and are inserted into the same insertion hole 612 on the circuit board 61, and the plurality of head portions 932 are utilized to realize the electrical connection between the connecting terminal 93 and the circuit board 61, on the one hand, the stability of the electrical connection between the connecting terminal 93 and the circuit board 61 is improved, and on the other hand, the current carrying strength is improved.

[0134] Wherein, each head 932 is formed with an elastic hole 933 and 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.

[0135] In some examples, the thickness of the connecting terminal 93 is greater than or equal to 0.8 mm, so that the connecting terminal 93 has a certain structural strength, and when the connecting terminal 93 is plugged with the plug-in hole 612, the connecting terminal 93 is suitable for bearing a larger force, so that the connecting terminal 93 is not easily broken.

[0136] Wherein, the thickness of the connecting terminal 93 can be 0.8 mm, 1 mm, 1.2 mm, 1.5 mm, 1.8 mm, or 2 mm, which is not limited here.

[0137] In some embodiments of the utility model, as shown in Figure 2 、 Figure 14 、 Figure 15 As shown, the electronic water pump 1 further comprises a rear cover 94, which is arranged at one end of the shell main body 10 away from the pump cover 20, and defines an electric control cavity 941 with the shell main body 10 and the heat dissipation plate 50. The controller is arranged in the electric control 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.

[0138] In some embodiments, as shown in Figure 14 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 arranged at intervals in a first direction and a plurality of second ribs 952 arranged at intervals in a second direction. Each first rib 951 extends linearly in the second direction, and each second rib 952 extends linearly in the first direction. The first ribs 951 and the second ribs 952 are arranged at intersections. The first direction and the second direction are perpendicular to the axial direction of the pump shaft 70, so as to increase the structural strength of the rear cover 94 by using the reinforcing structure 95, and better protect the components in the electric control cavity 941 by using the rear cover 94.

[0139] 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 ribs 951 and the second ribs 952, and thereby sufficiently increase the structural strength of the rear cover 94.

[0140] In some embodiments, as shown in Figure 14As 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.

[0141] 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.

[0142] 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 15 As shown, the rear cover 94 is configured to meet condition A3, the rear cover 94 is welded and fixed with the shell main body 10, and the outer peripheral wall of the rear cover 94 is provided with a welding positioning hole 943, so that the position of the rear cover 94 can be limited by external parts through the welding positioning hole 943 when the rear cover 94 and the shell main body 10 are welded, thereby facilitating to improve the stability of the welding of the rear cover 94 and the shell main body 10 and improve the welding quality.

[0143] In some examples, the rear cover 94 and the shell main body 10 are welded and connected by infrared welding, which can ensure the connection strength and sealing effect.

[0144] 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 14 , Figure 15 As shown, the rear cover 94 is configured to meet condition A4, the rear cover 94 includes a surrounding plate 945 and a bottom plate 946, the surrounding plate 945 surrounds the outer periphery of the bottom plate 946 and is fixed with the shell main body 10, and the bottom plate 946 includes a first wall portion 9461 and a second wall portion 9462 oppositely arranged along a first direction, and in the axial direction of the pump shaft 70, the distance between the first wall portion 9461 and the shell main body 10 is less than the distance between the second wall portion 9462 and the shell main body 10, so that the components with smaller height are arranged on the first wall portion 9461 and the components with larger height are arranged on the second wall portion 9462, thereby improving the utilization rate of the space in the electronic control cavity 941 and reducing the space occupied by the electronic water pump 1.

[0145] 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.

[0146] 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 for electrical connection with an external component.

[0147] A thermal management system according to embodiments of the present application is described below. The thermal management system according to embodiments of the present application comprises the electronic water pump 1 according to the above embodiments of the present application.

[0148] According to the thermal management system according to embodiments of the present application, by utilizing the electronic water pump 1 according to the above embodiments of the present application, the liquid therein can circulate and flow in the rotor cavity 11 and the impeller cavity 213, and the liquid can take away the heat on the heat sink 50 when circulating and flowing, thereby achieving heat dissipation of the controller. In this way, the heat dissipation is no longer relied on the pump shell, the heat dissipation effect is improved, and the material of the pump shell is not limited, thereby facilitating cost reduction.

[0149] A vehicle 1000 according to embodiments of the present application is described below. The vehicle 1000 according to embodiments of the present application comprises the thermal management system or the electronic water pump 1 according to the above embodiments of the present application.

[0150] According to the vehicle 1000 according to embodiments of the present application, by utilizing the thermal management system or the electronic water pump 1 according to the above embodiments of the present application, the liquid therein can circulate and flow in the rotor cavity 11 and the impeller cavity 213, and the liquid can take away the heat on the heat sink 50 when circulating and flowing, thereby achieving heat dissipation of the controller. In this way, the heat dissipation is no longer relied on the pump shell, the heat dissipation effect is improved, and the material of the pump shell is not limited, thereby facilitating cost reduction.

[0151] Other configurations and operations of the vehicle 1000 according to embodiments of the present application are known to those skilled in the art, and will not be described in detail here.

[0152] 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 "multiple" 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.

[0153] 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.

[0154] 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.

[0155] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "exemplary 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 exemplary 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.

[0156] 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 electronic water pump comprises: a pump shell, which comprises a shell main body and a first support, the shell main body has a rotor cavity inside, the first support is arranged in the rotor cavity and is integrally connected with the shell main body, and a first communication channel is formed on the first support and communicates both axial sides of the first support; a pump cover, which covers an axial end of the pump shell, and has an impeller cavity inside, and an axial end of the rotor cavity communicates with the impeller cavity; a rotor assembly, which is rotatably arranged in the rotor cavity and located on a side of the first support facing the pump cover; a pump shaft, which is supported between the first support and the pump cover and integrally connected with the first support, penetrates the rotor assembly and rotatably cooperates with the rotor assembly, and a second communication channel is formed on the pump shaft to make the part of the rotor cavity between the rotor assembly and the first support communicate with the impeller cavity through the first communication channel and the second communication channel; a heat dissipation plate, which covers an axial other end of the pump shell and is sealingly connected with the pump shell, and the first support and the pump shaft are both spaced apart from the heat dissipation plate in the axial direction; a controller, which is arranged on a side of the heat dissipation plate away from the rotor cavity and is in heat-conducting cooperation with the heat dissipation plate.

2. The electronic water pump according to claim 1, wherein the first support is formed in a plate structure and sleeved outside the pump shaft, and the first communication channel penetrates the first support in the axial direction; or the first support comprises a first connecting piece and a plurality of second connecting pieces arranged in a circumferential direction, the first connecting piece is sleeved outside the pump shaft, each second connecting piece connects an outer circumferential wall of the first connecting piece and an inner circumferential wall of the shell main body, and the interval between adjacent two second connecting pieces defines the first communication channel.

3. The electronic water pump of claim 2, wherein, the first support comprises a first connecting piece and a plurality of second connecting pieces arranged in a circumferential direction, the electronic water pump further comprises a stator assembly, the shell main body is an injection molded body and injection molded to wrap the stator assembly, the stator assembly comprises a stator core, an insulation support and a stator winding, the insulation support is an injection molded piece and injection molded to wrap the stator core, the stator winding is mounted on the insulation support, the stator core comprises a plurality of stator tooth portions arranged in an axial direction, and the second connecting piece is connected to a part of the shell main body corresponding to the interval between adjacent two stator tooth portions.

4. The electronic water pump of claim 1, wherein, The minimum axial distance between the first support, the pump shaft and the heat dissipation plate is x, and 0.8mm≤x≤1.2mm.

5. The electronic water pump of claim 1, wherein, The pump cover is formed with a medium inlet and a medium outlet communicating with the impeller cavity, an end of the second communication channel away from the heat dissipation plate is arranged adjacent to the medium inlet, and the communication position of the axial end of the rotor cavity and the impeller cavity is arranged radially adjacent to the medium outlet, a flow control hole communicating with the medium inlet is arranged on a downstream side of the second communication channel, the flow control hole is formed on the pump shaft or the pump cover, and the opening area of the flow control hole is smaller than the flow area of the second communication channel.

6. The electronic water pump of claim 5, wherein, 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 in plug-in cooperation with the pump shaft, and the flow control hole is formed on the second support.

7. The electronic water pump of claim 1, wherein The first connecting structure is integrally arranged on the shell body, penetrates through the heat dissipation plate, and is hot riveted to the heat dissipation plate. The heat dissipation plate and the shell body are provided with a sealing element. The sealing element is clamped between the shell body and the heat dissipation plate in the axial direction of the pump shaft, or the sealing element is clamped between the shell body and the heat dissipation plate in the radial direction of the pump shaft.

8. The electronic water pump according to claim 7, wherein One end of the shell body is formed with a matching groove, and the heat dissipation plate is matched with the matching groove; and / or The side of the heat dissipation plate facing the pump cover has a matching part, the matching part extends into the rotor cavity, an installation groove is formed on the outer peripheral wall of the matching part, and the sealing element is arranged in the installation groove.

9. The electronic water pump of claim 1, wherein, The heat dissipation plate comprises 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 rotor cavity. The plurality of heat dissipation fins are arranged on the outer peripheral side of the pump shaft at intervals in the circumferential direction. Each of the heat dissipation fins extends linearly or curvilinearly in the radial direction.

10. The electronic water pump according to any one of claims 1 to 9, characterized in that The pump shaft and the rotor assembly are provided with a bearing. The pump 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 in rotational cooperation with the bearing. The outer peripheral 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 9, characterized in that The pump cover is formed with a medium inlet and a medium outlet which are in communication with the impeller cavity. The rotor assembly comprises a rotor core, a rotor insulating element and a plurality of permanent magnets. The plurality of permanent magnets are arranged at intervals in the circumferential direction of the rotor core. The rotor insulating element injection-molds and injection-connects the rotor core and the permanent magnets. The outer peripheral wall of the rotor core is exposed to the rotor insulating element. The impeller and the rotor insulating element 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 formed with an impeller inlet opposite to the medium inlet. The 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 1-9, wherein, The controller comprises a circuit board and electronic devices. The heat-conducting glue is arranged between the circuit board and 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 body, is arranged on the outer peripheral side of the heat dissipation plate and penetrates through the circuit board, and is hot riveted to the circuit board; and / or The electronic water pump further comprises a connection terminal, the connection terminal is in a sheet structure and comprises a connection part and a plurality of head parts, the plurality of head parts are arranged at one end of the length direction of the connection part and are inserted into the same insertion hole on the circuit board, each head part is formed with an elastic hole and the width of the head part increases first and then decreases along the length direction of the connection part, and the thickness of the connection terminal is greater than or equal to 0.8 mm.

13. The electronic water pump of any one of claims 1-9, wherein, Further comprising: A rear cover is arranged at one end of the shell body away from the pump cover, and defines an electronic control cavity with the shell body and the heat dissipation plate, the controller is arranged in the electronic control 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 along the second direction, each second rib extends linearly along 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 pump 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 glue groove is formed on the inner wall surface and / or the outer wall surface of the rear cover, the glue groove surrounds the connection terminal, and a glue sealing element is arranged in the glue groove; Condition A3, the rear cover is welded and fixed with the shell body, and a welding positioning hole is arranged on the outer peripheral wall of the rear cover; 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 body, the bottom plate comprises a first wall part and a second wall part arranged opposite in a first direction, in the axial direction of the pump shaft, the distance between the first wall part and the shell body is less than the distance between the second wall part and the shell body, a connection terminal is arranged on the controller, the connection terminal penetrates through the first wall part, and the first direction is perpendicular to the axial direction of the pump shaft.

14. A thermal management system, characterized by, The electronic water pump according to any one of claims 1-13.

15. A vehicle characterized by comprising: The electronic water pump according to any one of claims 1-13 or the thermal management system according to claim 14.

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