An electronic water pump

Abstract

The present invention discloses an electronic water pump, which comprises a shaft core, a pump housing, a pump cover, a control box assembly, a rotor assembly, an impeller and a stator assembly; the control box assembly includes a control circuit board, a rear housing and a rear end cover with heat conduction performance, and at least a part of the control circuit board can exchange heat with the rear end cover; the stator assembly is integrated in the pump housing, and the stator assembly can exchange heat with the liquid medium passing through the rotor chamber through the pump housing; a diversion channel is established between the rotor chamber and the impeller chamber, so that the liquid medium in the rotor chamber and the impeller chamber can flow. The present invention mainly solves the problem of how to provide an efficient and reliable heat dissipation structure and heat dissipation method for the electronic water pump; the present invention enables the liquid medium in the rotor chamber and the impeller chamber to flow quickly, so as to conduct the heat of the rotor chamber to the impeller chamber, which can effectively improve the heat dissipation performance of the electronic water pump, and further improve the performance and service life of the electronic water pump.

Description

Technical Field

[0001] The present invention relates to the technical field of water pumps, and particularly to an electronic water pump. Background Art

[0002] Electronic water pumps have high output efficiency and can achieve precise flow control. Therefore, electronic water pumps are widely used in automobiles, household appliances, and industrial equipment. In particular, new energy vehicles usually have two or more electronic water pumps. The electronic water pump is the power source of the entire cooling system of new energy vehicles. The power battery, drive motor, etc. of new energy vehicles all rely on the electronic water pump to drive the coolant to circulate and cool.

[0003] The main control circuit board of the electronic water pump is equipped with a main control, power electronic devices for driving the stator assembly to operate, and other peripheral circuits. The stator assembly is composed of several enameled wire coils. Therefore, both the main control circuit board and the stator assembly of the electronic water pump are components with relatively large heat generation.

[0004] In order to dissipate heat from the main control circuit board, stator assembly, and other components of the electronic water pump, there are usually two methods in the prior art:

[0005] 1. A metal end cover with heat dissipation fins or heat dissipation columns is provided at one end of the electronic water pump. The control circuit board is installed close to the end cover. Through thermal conductive silicone grease or other thermal conductive media, heat exchange between the control circuit board and the metal end cover is achieved, and thus heat is dissipated outward through the heat dissipation fins or heat dissipation columns of the metal end cover. However, this natural convection heat dissipation method has low heat exchange efficiency and is difficult to meet the heat dissipation requirements of high-power control circuit boards.

[0006] 2. A packaging adhesive with good thermal conductivity is filled in the pump housing of the electronic water pump to conduct the heat of the stator assembly in the pump housing to the outside of the pump housing. At the same time, the heat from the stator assembly is also carried away by the liquid medium in the rotor chamber. However, the flow rate of the liquid medium in the rotor chamber is slow, and it is difficult to quickly carry away a large amount of heat.

[0007] In summary, how to provide an efficient and reliable heat dissipation structure and heat dissipation method for the electronic water pump has become an urgent problem to be solved. Summary of the Invention

[0008] The purpose of the present invention is to provide an electronic water pump that can provide an efficient and reliable heat dissipation structure and heat dissipation method for itself.

[0009] To achieve the above object, the present invention provides the following technical solution: An electronic water pump, which includes a shaft core, a pump housing, a pump cover, a control box assembly, a rotor assembly, an impeller, and a stator assembly; the pump cover is covered on one end of the pump housing to form a rotor chamber in the pump housing and an impeller chamber in the pump cover; the control box assembly includes a control circuit board, a rear housing, and a rear end cover with heat conduction performance; the rear housing and the rear end cover are covered and fixed to each other, the control circuit board is accommodated between the rear housing and the rear end cover, and at least a part of the control circuit board can exchange heat with the rear end cover; the rear end cover of the control box assembly is covered on the other end of the pump housing relative to the pump cover, so that the liquid medium passing through the rotor chamber can exchange heat with the rear end cover; the stator assembly is integrated in the pump housing, so that the impeller chamber is located inside the inner ring of the stator assembly, and the stator assembly can exchange heat with the liquid medium passing through the rotor chamber through the pump housing; at least one section of the shaft core is supported in the rotor chamber, and the rotor assembly is sleeved on this section of the shaft core; at least another section of the shaft core is supported in the impeller chamber, and the impeller is sleeved on this section of the shaft core; a diversion channel is established between the rotor chamber and the impeller chamber, so that the liquid media in the rotor chamber and the impeller chamber can flow.

[0010] In the above technical solution, the diversion channel includes a radial diversion sub-channel opened along the radial direction of the shaft core, and an axial diversion sub-channel opened along the axial direction of the shaft core; the radial diversion sub-channel and the axial diversion sub-channel communicate with each other inside the shaft core; at least one port of the radial diversion sub-channel is located in the rotor chamber, and at least one port of the axial diversion sub-channel is located in the impeller chamber.

[0011] In the above technical solution, at least one section of the shaft core is supported in the rotor chamber by a bottom support bearing; the diversion channel includes: a side diversion sub-channel opened along the side surface of the bottom support bearing, an end surface diversion sub-channel opened along the end surface of the bottom support bearing, and an axial diversion sub-channel opened along the axial direction of the shaft core; the side diversion sub-channel, the end surface diversion sub-channel, and the axial diversion sub-channel are connected in sequence.

[0012] In the above technical solution, the control box assembly further includes an isolation sheet with heat conduction performance and corrosion resistance; the isolation sheet is embedded on the surface of the rear end cover and can exchange heat with the rear end cover; after the rear end cover and the pump housing are assembled, the isolation sheet is located in the rotor chamber and is in contact with the liquid medium in the rotor chamber; the heat of the control circuit board can be conducted to the liquid medium in the rotor chamber through the rear end cover and the isolation sheet in sequence.

[0013] In the above technical solution, a first bearing embedding portion is formed by depression on the surface of the rear end cover, and a second bearing embedding portion is formed by depression on the spacer; the second bearing embedding portion of the spacer is embedded in the first bearing embedding portion of the rear end cover; the bottom support bearing is embedded in the second bearing embedding portion of the spacer; at least one port of the side flow guide sub-channel of the bottom support bearing is located in the rotor chamber, the end face flow guide sub-channel of the bottom support bearing is located at the bottom of the second bearing embedding portion, and at least one port of the axial flow guide sub-channel of the shaft core is located in the impeller chamber; the rear end cover forms a first sealing groove around the first bearing embedding portion, and the spacer forms a second sealing groove around the second bearing embedding portion; the second sealing groove of the spacer is embedded in the first sealing groove of the rear end cover; a shielding cover is integrated on the pump housing, and the shielding cover forms an end portion at the other end of the pump housing relative to the pump cover; the end portion of the shielding cover enters the second sealing groove of the spacer, and a sealing ring is arranged between the end portion of the shielding cover and the second sealing groove of the spacer.

[0014] In the above technical solution, the electric water pump of this embodiment further includes a bearing cover, the bearing cover covers the pump housing and separates the rotor chamber and the impeller chamber; an upper support bearing is embedded on the bearing cover, at least one section of the shaft core is supported by the upper support bearing, and the shaft core passes through the bearing cover to penetrate the rotor chamber and the impeller chamber; a flow-through hole is formed on the bearing cover for the liquid medium in the rotor chamber and the impeller chamber to communicate with each other.

[0015] In the above technical solution, the rotor assembly includes a magnetic ring bracket fixed on the shaft core and a magnetic ring fixed on the magnetic ring bracket.

[0016] In the above technical solution, the pump housing is formed outside the stator assembly in a way of overmolding, so that at least a part of the stator assembly is buried in the pump housing.

[0017] In the above technical solution, the pump housing further includes a mounting bracket; a mounting guide rail and a mounting bracket are respectively formed on the mounting bracket; the pump housing forms a first mounting table portion, the rear end cover and / or the rear housing of the control box assembly form a second mounting table portion, and the first mounting table portion forms a mounting guide rail groove matching the mounting guide rail of the mounting bracket, and the second mounting table portion is suitable for contacting and cooperating with the mounting bracket of the mounting bracket; the mounting guide rail of the mounting bracket can be inserted into the mounting guide rail groove of the pump housing, and when the mounting guide rail reaches the maximum insertion depth of the mounting guide rail groove, the mounting bracket of the mounting bracket can support the second mounting table portion of the control box assembly.

[0018] In the above technical solution, mounting screw holes are provided at the mounting brackets of the mounting bracket, and mounting screw seats are provided at a part of the second mounting platform of the control box assembly; when the mounting guide rail reaches the maximum insertion depth into the mounting guide rail groove, the mounting screw holes of the mounting bracket are aligned with the mounting screw seats of the control box assembly, and mounting screws can pass through the mounting screw holes and be locked into the mounting screw seats.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows: for the electronic water pump of the present invention, its control circuit board can quickly exchange heat with the liquid medium in the rotor chamber through the rear end cover, and the heat of its stator assembly can also quickly exchange heat with the liquid medium in the rotor chamber through the pump housing. Furthermore, by connecting the rotor chamber and the impeller chamber through the diversion channel, the liquid medium in the rotor chamber and the impeller chamber can circulate quickly, thereby conducting the heat of the rotor chamber to the impeller chamber, or conducting the heat of the impeller chamber to the rotor chamber. In this way, the heat dissipation performance of the electronic water pump can be effectively improved, and thus the performance and service life of the electronic water pump can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a three-dimensional view of the present invention.

[0021] Figure 2 is an exploded view of the present invention.

[0022] Figure 3 is one of the three-dimensional views of the shaft core in the present invention.

[0023] Figure 4 is one of the structural views of the shaft core in the present invention.

[0024] Figure 5 is one of the sectional views of the present invention.

[0025] Figure 6 is Figure 5 the enlarged partial view of A in

[0026] Figure 7 is the second three-dimensional view of the shaft core in the present invention.

[0027] Figure 8 is the second structural view of the shaft core in the present invention.

[0028] Figure 9 is the three-dimensional view of the bottom support bearing in the present invention.

[0029] Figure 10 is the end elevation view of the bottom support bearing in the present invention.

[0030] Figure 11 is the sectional view of the bottom support bearing in the present invention.

[0031] Figure 12 This is the second cross-sectional view of the present invention.

[0032] Figure 13 This is the structural view of the control box assembly in the present invention.

[0033] Figure 14 This is the structural view of the stator assembly in the present invention.

[0034] Figure 15 This is the first installation structure view of the present invention.

[0035] Figure 16 This is the second installation structure view of the present invention.

[0036] The reference numerals are: 1, shaft core; 11, axial guide sub-channel; 12, radial guide sub-channel; 2, pump housing; 21, shielding cover; 211, end; 212, sealing ring; 22, rotor chamber; 23, first installation table part; 231, installation guide rail groove; 24, installation bracket; 241, installation guide rail; 242, installation bracket; 243, installation screw hole; 3, pump cover; 31, water inlet; 32, water outlet; 33, impeller chamber; 4, control box assembly; 41, rear end cover; 411, first sealing groove; 412, first bearing embedding part; 42, control circuit board; 43, rear housing; 44, isolation sheet; 441, second sealing groove; 442, second bearing embedding part; 45, second installation table part; 451, installation screw seat; 5, bearing cover; 51, flow-through hole; 61, bottom support bearing; 611, end face guide sub-channel; 612, side face guide sub-channel; 62, upper support bearing; 7, rotor assembly; 71, magnetic ring; 72, magnetic ring bracket; 8, impeller; 9, stator assembly; 91, stator bracket; 92, coil; 93, terminal. Detailed implementation manners

[0037] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0038] This embodiment provides an electronic water pump that can be applied to positions such as automobiles, household appliances, and industrial equipment for driving water flow.

[0039] Please refer to Figure 1 , Figure 2 , Figure 5 and Figure 12, the electric water pump of this embodiment includes a shaft core 1, a pump housing 2, a pump cover 3, a control box assembly 4, a rotor assembly 7, an impeller 8, and a stator assembly 9.

[0040] Among them, the shaft core 1 is a metal shaft body formed by integral die-casting or integral machining, and its outer contour is generally cylindrical; the pump housing 2 is a semi-housing made of integrally formed engineering plastic or metal material, and the pump cover 3 is a cover body made of integrally formed engineering plastic or metal material, and the pump cover 3 is integrated with a water inlet 31 and a water outlet 32; the impeller 8 is a workpiece made of integrally formed engineering plastic or metal material, and the impeller 8 is provided with a number of blades for driving the flow of water; the stator assembly 9 has a number of enameled wire coils, and after the stator assembly 9 is energized, a rotating magnetic field can be generated in its inner ring.

[0041] The pump cover 3 is covered on one end of the pump housing 2 (the two are fixed to each other by screws) to form a rotor chamber 22 in the pump housing 2 and an impeller chamber 33 in the pump cover 3. In fact, both the rotor chamber 22 and the impeller chamber 33 are chambers inside the pump housing 2 and / or the pump cover 3.

[0042] The control box assembly 4 includes a control circuit board 42, a rear housing 43, and a rear end cover 41 with heat conduction performance. Among them, the rear end cover 41 is a cover body made of a metal material with good heat conduction performance, the rear housing 43 is a semi-housing made of integrally formed engineering plastic or metal material, the control circuit board 42 is based on a printed circuit board (PCB), and the control circuit board 42 is equipped with a main control, power electronic devices for driving the operation of the stator assembly 9, and other peripheral circuits; the rear housing 43 and the rear end cover 41 are covered and fixed to each other (the two are fixed to each other by screws), the control circuit board 42 is accommodated between the rear housing 43 and the rear end cover 41, and at least a part of the control circuit board 42 can exchange heat with the rear end cover 41; in some possible embodiments, the control circuit board 42 is in direct contact with the surface of the rear end cover 41, and a heat conduction medium such as heat conduction silicone grease is provided between the control circuit board 42 and the rear end cover 41.

[0043] The rear end cover 41 of the control box assembly 4 is covered on the other end of the pump housing 2 relative to the pump cover 3 (the two are fixed to each other by screws), so that the liquid medium passing through the rotor chamber 22 can exchange heat with the rear end cover 41. In fact, the liquid medium is in direct / indirect contact with the rear end cover 41, thereby exchanging heat.

[0044] The stator assembly 9 is integrated in the pump housing 2, so that the impeller chamber 33 is located in the inner ring of the stator assembly 9, and the stator assembly 9 can exchange heat with the liquid medium passing through the rotor chamber 22 through the pump housing 2.

[0045] At least one section of the shaft core 1 is supported within the rotor chamber 22, and the rotor assembly 7 is sleeved on this section of the shaft core 1; at least another section of the shaft core 1 is supported within the impeller chamber 33, and the impeller 8 is sleeved on this section of the shaft core 1.

[0046] To improve the heat dissipation performance of the electronic water pump, a diversion channel is established between the rotor chamber 22 and the impeller chamber 33, enabling the liquid medium in the rotor chamber 22 and the impeller chamber 33 to flow through.

[0047] Through the diversion channel, the rotor chamber 22 and the impeller chamber 33 of the electronic water pump are connected, allowing the liquid medium in the rotor chamber 22 and the impeller chamber 33 to flow quickly, thereby conducting the heat of the rotor chamber 22 to the impeller chamber 33, or conducting the heat of the impeller chamber 33 to the rotor chamber 22. In this way, the heat dissipation performance of the electronic water pump can be effectively improved, and further, the performance and service life of the electronic water pump can be enhanced.

[0048] Please refer to Figures 3 - 6 , in some possible embodiments, the diversion channel includes a radial diversion sub-channel 12 opened along the radial direction of the shaft core 1, and an axial diversion sub-channel 11 opened along the axial direction of the shaft core 1, that is, the radial diversion sub-channel 12 penetrates the side surface of the shaft core 1, and the axial diversion sub-channel 11 communicates with the two end faces of the shaft core 1; the radial diversion sub-channel 12 and the axial diversion sub-channel 11 communicate with each other inside the shaft core 1; at least one port of the radial diversion sub-channel 12 is located within the rotor chamber 22. In this embodiment, the port of the radial diversion sub-channel 12 serves as the inlet / outlet of the liquid medium in the rotor chamber 22; at least one port of the axial diversion sub-channel 11 is located within the impeller chamber 33. In this embodiment, the port of the axial diversion sub-channel 11 serves as the inlet / outlet of the liquid medium in the impeller chamber 33.

[0049] Furthermore, the inner diameter of the axial diversion sub-channel 11 is d1, the inner diameter of the radial diversion sub-channel 12 is d2, and the outer diameter of the shaft core 1 body is d;

[0050] Then: d / 10 ≤ d1 = d2 ≤ d / 5.

[0051] When the above relationship is satisfied, the flow velocity of the liquid medium in the radial diversion sub-channel 12 and the axial diversion sub-channel 11 is consistent, the hydraulic loss is small, and the impact on the performance of the electronic water pump is small. At the same time, its heat exchange efficiency is high, and it can meet the heat dissipation requirements of the electronic water pump.

[0052] Please refer to Figures 7 - 12, in some other possible embodiments, at least one section of the shaft core 1 is supported in the rotor chamber 22 by a bottom support bearing 61, and the bottom support bearing 61 is one of a ceramic bearing, a graphite bearing, and a self-lubricating bushing; the diversion channel includes: a side diversion sub-channel 612 opened along the side surface of the bottom support bearing 61, an end face diversion sub-channel 611 opened along the end face of the bottom support bearing 61, and an axial diversion sub-channel 11 opened along the axial direction of the shaft core 1. In fact, the axial diversion sub-channel 11 is a through hole axially penetrating the shaft core 1, the side diversion sub-channel 612 is a groove opened on the side surface of the bottom support bearing 61, and the end face diversion sub-channel 611 is a groove opened on the end face of the bottom support bearing 61; the side diversion sub-channel 612, the end face diversion sub-channel 611, and the axial diversion sub-channel 11 are connected in sequence.

[0053] Further, the inner diameter of the axial diversion sub-channel 11 of the shaft core 1 is d1, and the outer diameter of the shaft core 1 is d;

[0054] Then: d / 10 ≤ d1 ≤ d / 5.

[0055] When the above relationship is satisfied, as a part of the diversion channel, the axial diversion sub-channel 11 has a smaller hydraulic loss, has a smaller impact on the performance of the liquid-cooled circulation heat dissipation electronic water pump, and at the same time, has a higher heat exchange efficiency and can meet the heat dissipation requirements of the liquid-cooled circulation heat dissipation electronic water pump.

[0056] Further, the inner hole diameter of the bottom support bearing 61 is t, the widths of the side diversion sub-channel 612 and the end face diversion sub-channel 611 of the bottom support bearing 61 are both w, the groove depth of the side diversion sub-channel 612 of the bottom support bearing 61 is h1, and the groove depth of the end face diversion sub-channel 611 of the bottom support bearing 61 is h2;

[0057] Then:

[0058] When the above relationship is satisfied, the liquid medium flowing through the side diversion sub-channel 612 and the end face diversion sub-channel 611 can quickly take away the heat of the inner end cover, further improving the heat dissipation performance of the electronic water pump.

[0059] Please refer to Figure 13, Further, the control box assembly 4 further includes a spacer 44 having heat conduction and corrosion resistance properties. In fact, the spacer 44 is a stainless steel thin sheet formed by integral stamping (in the application scenario of an electronic water pump, the vast majority of liquid media cannot corrode stainless steel); the spacer 44 is embedded in the surface of the rear end cover 41 and can exchange heat with the rear end cover 41; after the rear end cover 41 is assembled with the pump housing 2, the spacer 44 is located in the rotor chamber 22 and is in contact with the liquid medium in the rotor chamber 22; the heat of the control circuit board 42 can be conducted to the liquid medium in the rotor chamber 22 through the rear end cover 41 and the spacer 44 in sequence.

[0060] A first bearing embedding portion 412 is formed by depression on the surface of the rear end cover 41, and a second bearing embedding portion 442 is formed by depression on the spacer 44. The second bearing embedding portion 442 of the spacer 44 is embedded in the first bearing embedding portion 412 of the rear end cover 41; the bottom support bearing 61 is embedded in the second bearing embedding portion 442 of the spacer 44. In fact, the side guide channel 612 of the bottom support bearing 61 is close to the inner wall of the second bearing embedding portion 442, and the end face guide channel 611 of the bottom support bearing 61 is close to the bottom inner wall of the second bearing embedding portion 442. There is a certain gap between the side guide channel 612 and the end face guide channel 611 and the inner wall of the second bearing embedding portion 442 to allow fluid to pass through; at least one port of the side guide channel 612 of the bottom support bearing 61 is located in the rotor chamber 22. In this embodiment, the port of the side guide channel 612 serves as the inlet / outlet of the liquid medium in the rotor chamber 22. The end face guide channel 611 of the bottom support bearing 61 is located at the bottom of the second bearing embedding portion 442, and at least one port of the axial guide channel 11 of the shaft core 1 is located in the impeller chamber 33. In this embodiment, the port of the axial guide channel 11 serves as the inlet / outlet of the liquid medium in the impeller chamber 33. The rear end cover 41 forms a first sealing groove 411 around the first bearing embedding portion 412, and the spacer 44 forms a second sealing groove 441 around the second bearing embedding portion 442. The second sealing groove 441 of the spacer 44 is embedded in the first sealing groove 411 of the rear end cover 41; a shielding cover 21 is integrated on the pump housing 2. The shielding cover 21 is made of a material that allows magnetic fields to pass through, such as a plastic material or a stainless steel material with micro-magnetic conductivity after heat treatment. The shielding cover 21 forms an end portion 211 at the other end of the pump housing 2 relative to the pump cover 3, and the end portion 211 is in an open form; the end portion 211 of the shielding cover 21 enters the second sealing groove 441 of the spacer 44, and a sealing ring 212 is provided between the end portion 211 of the shielding cover 21 and the second sealing groove 441 of the spacer 44. In this way, the sealing between the rotor chamber 22 and the control box assembly 4 is achieved.

[0061] It should be noted that the rear end cover 41 can be directly integrally formed on the spacer 44, or alternatively, the spacer 44 and the rear end cover 41 can be assembled and connected (for example, in this embodiment, the spacer 44 and the rear end cover 41 are combined into one by riveting and pressing, and a heat-conducting medium such as heat-conducting silicone grease is provided between the spacer 44 and the rear end cover 41).

[0062] Please refer to Figure 2 、 Figure 5 and Figure 12 , further, the electric water pump of this embodiment further includes a bearing cover 5, which is an integrally formed cover body made of engineering plastic or metal material. The bearing cover 5 covers the pump housing 2 (the two are fixed to each other by screws) and separates the rotor chamber 22 and the impeller chamber 33; an upper support bearing 62 (such as a ceramic bearing, a graphite bearing or a self-lubricating bushing) is embedded in the bearing cover 5, at least a section of the shaft core 1 is supported by the upper support bearing 62, and the shaft core 1 passes through the bearing cover 5 to penetrate the rotor chamber 22 and the impeller chamber 33; a flow-through hole 51 is formed in the bearing cover 5 for the liquid medium in the rotor chamber 22 and the impeller chamber 33 to communicate with each other. In fact, the flow-through hole 51 is a through hole penetrating both sides of the bearing cover 5.

[0063] Please refer to Figure 2 、 Figure 5 and Figure 12 , specifically, the rotor assembly 7 includes a magnetic ring bracket 72 fixed on the shaft core 1, and a magnetic ring 71 fixed on the magnetic ring bracket 72; in some possible embodiments, the shaft core 1 and the magnetic ring 71 are placed in the mold of the magnetic ring bracket 72, and the magnetic ring bracket 72 is formed by in-mold injection molding, that is, the shaft core 1, the magnetic ring bracket 72 and the magnetic ring 71 are formed into one body.

[0064] Further, the pump housing 2 is formed in a overmolding manner outside the stator assembly 9, so that at least a part of the stator assembly 9 is buried in the pump housing 2; please refer to Figure 14, specifically, the stator assembly 9 includes a stator bracket 91, a coil 92 wound around the stator bracket 91, and a plurality of terminals 93 fixed to the stator bracket 91 and connected to the coil 92; wherein, the stator bracket 91 is a circular bracket made of engineering plastic, the coil 92 is an electromagnetic coil 92 formed by winding an enameled wire around the stator bracket 91 for a certain number of turns, the terminals 93 are inserted and fixed on the stator bracket 91, and each terminal 93 is electrically connected to the coil 92 according to its polarity; after energizing the coil 92 through the terminals 93, a rotating magnetic field can be generated in the inner ring of the stator assembly 9; in this embodiment, the stator bracket 91 and the coil 92 of the stator assembly 9 are buried in the pump housing 2, and at least a part of the terminals 93 is exposed outside the pump housing 2; first, the stator assembly 9 is assembled, and the whole stator assembly 9 is placed into the forming mold of the pump housing 2, and then a thermosetting plastic is injected into the forming mold. After the thermosetting plastic is cured, the pump housing 2 is formed. At this time, the stator assembly 9 and the pump housing 2 body are formed into one body; the pump housing 2 is formed outside the stator assembly 9 in a way of overmolding, which provides an integrated and integrated structure for the stator assembly 9 and the pump housing 2, thereby improving the integration and integration degree of the electronic water pump, reducing the assembly difficulty of each part, and avoiding the influence brought by poor assembly or assembly error; the plastic material of the pump housing 2 can fill all the gaps of the stator assembly 9, has good heat conduction performance, and can effectively dissipate heat for the stator assembly 9 to ensure the working stability of the stator assembly 9.

[0065] Please refer to Figure 15 and Figure 16 , further, the pump housing 2 further includes a mounting bracket 24, which is an integrally formed engineering plastic bracket or a metal bracket, and has a flat bottom plate as a structural basis; mounting guide rails 241 and mounting brackets 242 are respectively formed on the mounting bracket 24. In this embodiment, both the mounting guide rails 241 and the mounting brackets 242 are integrally formed with the mounting bracket 24, and the end of the mounting guide rail 241 is connected to the mounting bracket 242; the pump housing 2 forms a first mounting table portion 23, which is in the shape of a platform, and the rear end cover 41 and / or the rear housing 43 of the control box assembly 4 form a second mounting table portion 45. In this embodiment, the second mounting table portion 45 is a side surface of the control box assembly 4, and the first mounting table portion 23 forms a mounting guide rail groove 231 matching the mounting guide rail 241 of the mounting bracket 24. Actually, the mounting guide rail groove 231 is a groove integrally formed on the first mounting table portion 23, and the second mounting table portion 45 is adapted to be in contact and cooperate with the mounting bracket 242 of the mounting bracket 24; the mounting guide rail 241 of the mounting bracket 24 can be inserted into the mounting guide rail groove 231 of the pump housing 2, and when the mounting guide rail 241 reaches the maximum insertion depth of the mounting guide rail groove 231, the mounting bracket 242 of the mounting bracket 24 can support the second mounting table portion 45 of the control box assembly 4.

[0066] In fact, the mounting guide rail 241 is a T-shaped guide rail or an L-shaped guide rail. Correspondingly, the mounting guide rail groove 231 is a T-shaped groove or an L-shaped groove.

[0067] At the mounting bracket 242 of the mounting bracket 24, a mounting screw hole 243 is provided. At the second mounting table portion 45 of the control box assembly 4, a mounting screw seat 451 is provided. When the mounting guide rail 241 reaches the maximum insertion depth into the mounting guide rail groove 231, the mounting screw hole 243 of the mounting bracket 24 is aligned with the mounting screw seat 451 of the control box assembly 4, and the mounting screw can pass through the mounting screw hole 243 and be locked into the mounting screw seat 451.

[0068] It should be noted that in this embodiment, there are two sets of mounting guide rails 241 and mounting guide rail grooves 231, and there are two mounting brackets 242. Moreover, one mounting screw hole 243 is provided on each mounting bracket 242. In other possible embodiments, the number of sets of mounting guide rails 241 and mounting guide rail grooves 231, the number of mounting brackets 242, and the number of mounting screw holes 243 on each mounting bracket 242 can all be adjusted according to the size, weight, and load of the electronic water pump, etc.

[0069] Through the mounting bracket 24, the electronic water pump can be stably mounted on fixed structures such as the body of an automobile, the housing / bracket of a household appliance, and the housing / bracket of an industrial device.

[0070] The following further specifically describes the operation method of the electronic water pump in this embodiment:

[0071] After the control circuit board 42 is powered on, it drives the stator assembly 9 to operate, causing the stator assembly 9 to generate a rotating magnetic field in its inner ring. The magnetic ring 71 of the rotor assembly 7 starts to rotate under the magnetic coupling action of this rotating magnetic field, and then drives the magnetic ring bracket 72, the shaft core 1, and the impeller 8 that are directly or indirectly connected to it to rotate. The rotating impeller 8 can drive the liquid medium in the impeller chamber 33 to operate (the liquid medium is sucked in from the water inlet 31 of the pump cover 3 and discharged from the water outlet 32 of the pump cover 3), completing the basic function of the electronic water pump. At the same time, due to the existence of the overflow hole 51 on the bearing cover 5, the liquid medium in the impeller chamber 33 can flow to the rotor chamber 22. The liquid medium in the rotor chamber 22 contacts the shielding cover 21 of the pump housing 2, and can take away the heat of the shielding cover 21, and then take away the heat of the stator assembly 9 buried in the pump housing 2. At the same time, the liquid medium in the rotor chamber 22 also contacts the isolation piece 44 of the control box assembly 4, and can take away the heat of the isolation piece 44 and the rear end cover 41, and then take away the heat of the control circuit board 42. The liquid medium in the rotor chamber 22 returns to the impeller chamber 33 via the diversion channel, is discharged from the water outlet 32 of the pump cover 3, and enters the next round of liquid medium circulation.

[0072] For the electric water pump of this embodiment, its control circuit board 42 can quickly exchange heat with the liquid medium in the rotor chamber 22 through the rear end cover 41. The heat of its stator assembly 9 can also quickly exchange heat with the liquid medium in the rotor chamber 22 through the pump housing 2. Furthermore, by connecting the rotor chamber 22 and the impeller chamber 33 through a diversion channel, the liquid medium in the rotor chamber 22 and the impeller chamber 33 can circulate quickly, thereby conducting the heat of the rotor chamber 22 to the impeller chamber 33, or conducting the heat of the impeller chamber 33 to the rotor chamber 22. In this way, the heat dissipation performance of the electric water pump can be effectively improved, and thus the performance and service life of the electric water pump can be improved.

[0073] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An electronic water pump, characterized in that, It includes a shaft core, a pump housing, a pump cover, a control box assembly, a rotor assembly, an impeller, and a stator assembly; The pump cover is closed on one end of the pump housing to form a rotor chamber in the pump housing and an impeller chamber in the pump cover; The control box assembly includes a control circuit board, a rear housing, and a rear end cover with heat conduction performance; the rear housing and the rear end cover are covered and fixed to each other, the control circuit board is accommodated between the rear housing and the rear end cover, and at least a part of the control circuit board can exchange heat with the rear end cover; The rear end cover of the control box assembly is closed on the other end of the pump housing relative to the pump cover, so that the liquid medium passing through the rotor chamber can exchange heat with the rear end cover; The stator assembly is integrated in the pump housing, so that the impeller chamber is located in the inner ring of the stator assembly, and the stator assembly can exchange heat with the liquid medium passing through the rotor chamber through the pump housing; At least one section of the shaft core is supported in the rotor chamber, and the rotor assembly is sleeved on this section of the shaft core; at least another section of the shaft core is supported in the impeller chamber, and the impeller is sleeved on this section of the shaft core; A diversion channel is established between the rotor chamber and the impeller chamber, so that the liquid media in the rotor chamber and the impeller chamber can flow; The diversion channel includes a radial diversion sub-channel opened along the radial direction of the shaft core, and an axial diversion sub-channel opened along the axial direction of the shaft core; The radial diversion sub-channel and the axial diversion sub-channel communicate with each other inside the shaft core; At least one port of the radial diversion sub-channel is located in the rotor chamber, and at least one port of the axial diversion sub-channel is located in the impeller chamber; At least one section of the shaft core is supported in the rotor chamber by a bottom support bearing; The diversion channel includes: a side diversion sub-channel opened along the side surface of the bottom support bearing, an end face diversion sub-channel opened along the end face of the bottom support bearing, and an axial diversion sub-channel opened along the axial direction of the shaft core; The side diversion sub-channel, the end face diversion sub-channel, and the axial diversion sub-channel are connected in sequence; The control box assembly further includes an isolation sheet with heat conduction performance and corrosion resistance; The isolation sheet is embedded on the surface of the rear end cover and can exchange heat with the rear end cover; After the rear end cover and the pump housing are assembled, the isolation sheet is located in the rotor chamber and contacts the liquid medium in the rotor chamber; The heat of the control circuit board can be conducted to the liquid medium in the rotor chamber through the rear end cover and the isolation sheet in sequence; A first bearing embedding part is formed by depression on the surface of the rear end cover, and a second bearing embedding part is formed by depression on the isolation sheet; The second bearing embedding part of the isolation sheet is embedded in the first bearing embedding part of the rear end cover; The bottom support bearing is embedded in the second bearing embedding part of the isolation sheet; At least one port of the side guide vane channel of the bottom support bearing is located in the rotor chamber, the end face guide vane channel of the bottom support bearing is located at the bottom of the second bearing embedding part, and at least one port of the axial guide vane channel of the shaft core is located in the impeller chamber; The rear end cover forms a first sealing groove around the first bearing embedding part, and the spacer forms a second sealing groove around the second bearing embedding part; The second sealing groove of the spacer is embedded in the first sealing groove of the rear end cover; A shielding cover is integrated on the pump casing, and the shielding cover forms an end at the other end of the pump casing relative to the pump cover; The end of the shielding cover enters the second sealing groove of the spacer, and a sealing ring is arranged between the end of the shielding cover and the second sealing groove of the spacer; The pump casing further includes a mounting bracket; Mounting guide rails and mounting brackets are respectively formed on the mounting bracket; The pump casing forms a first mounting table part, the rear end cover and / or the rear housing of the control box assembly form a second mounting table part, and the first mounting table part forms a mounting guide rail groove matching the mounting guide rail of the mounting bracket, and the second mounting table part is adapted to be in contact and cooperation with the mounting bracket of the mounting bracket; The mounting guide rail of the mounting bracket can be inserted into the mounting guide rail groove of the pump casing, and when the mounting guide rail reaches the maximum insertion depth of the mounting guide rail groove, the mounting bracket of the mounting bracket can support the second mounting table part of the control box assembly; Mounting screw holes are formed at the mounting bracket of the mounting bracket, and mounting screw seats are arranged at the second mounting table part of the control box assembly; When the mounting guide rail reaches the maximum insertion depth of the mounting guide rail groove, the mounting screw holes of the mounting bracket are aligned with the mounting screw seats of the control box assembly, and mounting screws can pass through the mounting screw holes and be locked into the mounting screw seats; 2. The electric water pump according to claim 1, wherein: It further includes a bearing cover, and the bearing cover covers the pump casing and separates the rotor chamber and the impeller chamber; An upper support bearing is embedded on the bearing cover, at least one section of the shaft core is supported by the upper support bearing, and the shaft core passes through the bearing cover to penetrate the rotor chamber and the impeller chamber; Flow holes are formed in the bearing cover for the liquid medium in the rotor chamber and the impeller chamber to communicate with each other; 3. The electric water pump according to claim 1, characterized in that: The rotor assembly includes a magnetic ring bracket fixed on the shaft core and a magnetic ring fixed on the magnetic ring bracket; 4. The electric water pump according to claim 1, wherein: The pump casing is formed outside the stator assembly in a way of overmolding, so that at least a part of the stator assembly is buried in the pump casing.

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