A high-power brushless electronic water pump

Abstract

The application discloses a high-power brushless electronic water pump, which comprises a shell and an upper cover, a spacer sleeve sealing assembly is further arranged in the shell, a rotor impeller assembly is rotatably arranged in the spacer sleeve sealing assembly, a fluid chamber is formed between the spacer sleeve sealing assembly and the upper cover, and a stator assembly is arranged between the spacer sleeve sealing assembly and the shell; a cooling ring is arranged on the bottom plate of the shell and forms a fluid cooling chamber, a fluid flow gap is arranged between the spacer sleeve sealing assembly and the rotor impeller assembly, the rotor impeller assembly comprises a central shaft, an impeller and a rotor body, the impeller is fixed to the upper end of the central shaft, a central hole is arranged on the central shaft, and the central hole is communicated between the fluid cooling chamber and the fluid chamber. The electronic water pump can better utilize the fluid in the fluid chamber to take away heat, improve heat dissipation efficiency, and thus meet the heat dissipation requirement of the high-power water pump.

Description

Technical Field

[0001] This invention relates to the field of electronic water pump technology, and in particular to a high-power brushless electronic water pump. Background Technology

[0002] Currently, the circuit board on the electric water pump is mounted on the end of the casing via brackets. The heat dissipation of the electric water pump casing and its circuit board is achieved through the heat sink installed on the casing and the flow of air. However, since the electric water pump is installed in the engine compartment, and the ambient temperature in the engine compartment is high, the heat dissipation efficiency of the water pump is low during operation. At the same time, because the circuit board itself has a temperature protection function, the water pump will stop working when the temperature exceeds a certain level, which poses a significant safety hazard to the vehicle. Furthermore, due to the above limitations, high-power (especially 100W and above) water pumps cannot be made.

[0003] The applicant has filed patents for electronic water pumps, with patent application numbers 202011203631.6 and 202110620076.4. The structure of the electronic water pump disclosed in these patents still has the following drawbacks:

[0004] 1. This electronic water pump rotates the impeller through the rotor impeller assembly. The impeller drives the coolant and other fluids to circulate within the septum seal assembly (specifically, the coolant enters the septum seal assembly through the inlet pipe of the top cover and then flows out through the outlet pipe of the top cover). However, the entire flow path of the coolant is from the gap between the septum seal assembly and the rotor assembly, which results in a relatively small cooling flow rate. As a result, the heat dissipation performance cannot be improved, and it is not possible to make a water pump with higher power.

[0005] 2. The rotor impeller assembly structures of the electronic water pumps in patents 202011203631.6 and 202110620076.4 are unreasonable. The rotor assembly structures of the two patents are quite similar. The rotor assembly includes an impeller and a rotor bushing. The impeller is fixed to the upper end of the rotor bushing. The upper and lower inner holes of the rotor bushing are respectively concentrically embedded with an upper wear-resistant lubricating insert and a lower wear-resistant lubricating insert. The upper and lower wear-resistant lubricating inserts are provided with a central hole that is concentric with the inner hole of the rotor bushing. The spindle is fixed to the bottom of the spacer assembly, and the shaft bushing is sleeved on the spindle. However, the spindle is only fixed at the lower end, and the force on the spindle is unreasonable. To address this, an upper fixing post and a connecting rib are provided on the upper cover. In this way, the upper fixing post of the impeller is sleeved on the upper end of the spindle, thereby making the force on the spindle and impeller more reasonable. However, the connecting rib and the upper fixing post will reduce the size of the water inlet channel of the upper cover. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a high-power brushless electronic water pump that can better utilize the fluid in the fluid chamber to remove heat, improve heat dissipation efficiency, and thus meet the heat dissipation requirements of high-power water pumps.

[0007] To solve the above-mentioned technical problems, the technical solution of the present invention is: a high-power brushless electronic water pump, comprising a housing with one open end and a base plate at the other end, a top cover installed at the open end of the housing, and an end cover installed at the lower end of the housing, a circuit board receiving cavity provided between the base plate and the end cover, a circuit board installed in the circuit board receiving cavity, a spacer sealing assembly provided inside the housing, a rotor assembly mounting cavity provided inside the spacer sealing assembly, a rotor impeller assembly rotatably mounted in the rotor assembly mounting cavity, a fluid chamber formed between the spacer sealing assembly and the top cover, an inlet and an outlet provided on the top cover, a stator assembly mounting cavity formed between the spacer sealing assembly and the housing, a stator assembly installed in the stator assembly mounting cavity; one end of the spacer sealing assembly is clamped by the top cover and the housing, and the other end of the spacer sealing assembly extends toward the base plate, the base plate being provided with an upwardly protruding... A cooling ring sleeve is provided, with a sealing fit between the spacer sleeve sealing assembly and the cooling ring sleeve. The inner cavity of the cooling ring sleeve, the outer cavity between the cooling ring sleeve and the spacer sleeve sealing assembly together form a fluid cooling chamber. A fluid flow gap is provided between the spacer sleeve sealing assembly and the rotor impeller assembly. The spacer sleeve sealing assembly is provided with a connecting hole that connects the fluid chamber and the fluid flow gap. The rotor impeller assembly includes a central shaft, an impeller, and a rotor body. The lower end of the central shaft is rotatably mounted on the cooling ring sleeve through a lower shaft sleeve. The upper end of the central shaft passes through the spacer sleeve sealing assembly and extends into the fluid chamber. The impeller is fixed to the upper end of the central shaft and located in the fluid chamber. The upper part of the central shaft is rotatably fitted with the spacer sleeve sealing assembly through an upper shaft sleeve. The cooling ring sleeve is provided with a connecting slot that connects the inner cavity and the outer cavity of the cooling ring sleeve. The central shaft is provided with an axially penetrating central hole that connects the fluid cooling chamber and the fluid chamber.

[0008] As a preferred embodiment, the spacer sealing assembly includes a spacer body and a pressure cap. A positioning ring is also provided on the base plate outside the cooling ring. The lower end of the spacer body is fitted into the positioning ring and sealed. The pressure cap includes a cover plate portion. The lower end of the cover plate portion is provided with a first mounting protrusion, a second mounting protrusion, a third mounting protrusion, and a fourth mounting protrusion with gradually decreasing diameters. The first mounting protrusion is sealed to the outer shell. The upper end of the spacer body is fitted between the second and third mounting protrusions and sealed. The upper shaft sleeve is installed between the fourth mounting protrusion and the central shaft.

[0009] As a preferred embodiment, the housing is a metal housing, and the lower end of the stator assembly is also provided with an insulating protective ring to prevent the metal parts of the stator assembly from contacting the housing.

[0010] As a preferred embodiment, the stator assembly includes a stator core and upper and lower insulating end caps disposed at both ends of the stator core. A stator winding is wound between the upper and lower insulating end caps. A phase ring is fixed on the lower insulating end cap. The phase ring includes a phase ring body made of plastic. The phase ring body is provided with several annular grooves. Three metal connecting pieces are embedded in the annular grooves. Each metal connecting piece is provided with an axially protruding metal pin and at least one winding hook pointing to the center. The enameled wire of the stator winding passes around the winding hook and is welded to form a specified winding structure. An insulating protective ring protects between the winding hook and the positioning ring sleeve.

[0011] As a preferred embodiment, the lower insulating end cap is provided with three or six winding grooves to facilitate the passage of enameled wire, and the winding hooks correspond to the positions of the winding grooves.

[0012] As a preferred embodiment, the phase ring body is provided with at least three radial connecting blocks extending towards the center, the insulating protective ring includes a protective ring body, the outer periphery of the protective ring body is provided with mounting parts corresponding to the radial connecting blocks one by one, the mounting parts are engaged with the radial connecting blocks, and the protective ring body is also provided with a protective plate part covering the winding hook.

[0013] As a preferred embodiment, the stator core includes an annular yoke, stator teeth, and an outer stator ring. The stator teeth are evenly distributed around the outer periphery of the annular yoke, and stator slots are formed between adjacent stator teeth. Stator pole shoes are provided at the outer ends of the stator teeth. The upper insulating end cap and the lower insulating end cap respectively cover the annular yoke, stator teeth, and stator pole shoes. The outer stator ring is provided with a plurality of mounting slots corresponding one-to-one with the stator pole shoes, and the stator pole shoes are embedded one-to-one into the mounting slots.

[0014] As a preferred embodiment, the stator pole shoe includes an outer contour surface and an inner contour surface. The outer contour surface is an arc surface and is concentrically arranged with the annular yoke. The inner contour surface is also an arc surface, and the diameter of the inner contour surface is larger than the diameter of the outer contour surface.

[0015] As a preferred embodiment, the inner circumferential surface of the stator outer ring is provided with an avoidance arc groove that matches the inner contour surface of the stator pole shoe.

[0016] As a preferred embodiment, the end cap is provided with a vent hole, the inner side of the end cap is attached with a waterproof and breathable membrane, the end cap is provided with a protective arch outside the protective hole, and the side of the protective arch is provided with a side vent that communicates with the vent hole.

[0017] After adopting the above technical solution, the effect of the present invention is as follows: Because the base plate is provided with an upwardly protruding cooling ring, the spacer sealing assembly and the cooling ring are sealed together. The inner cavity of the cooling ring, the outer cavity of the cooling ring, and the outer cavity between the spacer sealing assembly together form a fluid cooling chamber. A fluid flow gap is provided between the spacer sealing assembly and the rotor impeller assembly. The spacer sealing assembly is provided with a connecting hole that connects the fluid chamber to the fluid flow gap. The rotor impeller assembly includes a central shaft, an impeller, and a rotor body. The lower end of the central shaft is rotatably mounted on the cooling ring via a lower shaft sleeve. The upper end of the central shaft passes through the spacer sealing assembly and extends into the fluid chamber. The impeller is fixed to the upper end of the central shaft and located within the fluid chamber. The upper part of the central shaft and the spacer sealing assembly are rotatably fitted via an upper shaft sleeve. The cooling ring is provided with a connecting hole that connects the fluid chamber to the fluid flow gap. The cooling ring has a connecting slot that connects the inner and outer cavities. The central shaft has an axially penetrating central hole that connects the fluid cooling chamber and the fluid chamber. Therefore, the fluid in the fluid chamber enters the cooling chamber through the fluid flow gap and then flows back up into the fluid chamber through the central hole on the central shaft. The entire path forms a loop. Since the central shaft is in the center position, its upper end is a negative pressure zone, which can accelerate the fluid flow. This results in better cooling of the base plate and better heat dissipation from the PCBA, which can meet the heat dissipation requirements of higher power electronic water pumps. In addition, the upper and lower ends of the central shaft are rotatably installed through upper and lower shaft sleeves, respectively. Therefore, the overall stress of the central shaft and rotor impeller assembly is better. There is no need to install additional auxiliary fixing structures to fix the central shaft at the water inlet of the top cover, so the water inlet of the water pump can be larger.

[0018] Furthermore, since the spacer sealing assembly includes a spacer body and a pressure cap, and a positioning ring is also provided on the base plate outside the cooling ring, the lower end of the spacer body is fitted into the positioning ring and sealed. The pressure cap includes a cover plate portion, and the lower end of the cover plate portion is provided with a first mounting protrusion, a second mounting protrusion, a third mounting protrusion, and a fourth mounting protrusion with gradually decreasing diameters. The first mounting protrusion is sealed to the outer shell, and the upper end of the spacer body is fitted between the second and third mounting protrusions and sealed. The upper shaft sleeve is installed between the fourth mounting protrusion and the central shaft. This spacer sealing assembly has a reasonable structure, and the first, second, third, and fourth mounting protrusions on the cover plate portion can better facilitate the installation of the pressure cap portion, the spacer body, and the upper bearing.

[0019] Furthermore, since the outer casing is a metal casing, an insulating protective ring is provided at the lower end of the stator assembly to prevent the metal parts of the stator assembly from contacting the outer casing. In this way, the entire outer casing serves as a heat dissipation component, and the insulating protective ring can effectively protect the stator assembly and the metal casing, ensuring insulation while improving heat dissipation.

[0020] Furthermore, since the stator assembly includes a stator core and upper and lower insulating end caps located at both ends of the stator core, a stator winding is wound between the upper and lower insulating end caps. A phase ring is fixed on the lower insulating end cap. The phase ring includes a phase ring body made of plastic, and the phase ring body is provided with several annular grooves. Three metal connecting pieces are embedded in the annular grooves. Each metal connecting piece is provided with an axially protruding metal pin and at least one winding hook pointing to the center. The enameled wire of the stator winding passes around the winding hook and is welded to form a specified winding structure. An insulating protective ring protects between the winding hook and the positioning ring sleeve. This stator assembly uses the phase ring to realize the conductive connection between the stator winding and the circuit board, making the connection simpler.

[0021] Furthermore, since the lower insulating end cover is provided with three or six winding slots for easy passage of enameled wire, and the winding hooks correspond to the positions of the winding slots, the winding method of the stator winding can be selected using these winding slots. When three winding slots are used, series connection can be achieved to meet the 24V requirement, while when six winding slots are used, parallel connection can be achieved to meet the 12V requirement.

[0022] Furthermore, since the phase ring body is provided with at least three radial connecting blocks extending towards the center, the insulating protective ring includes a protective ring body, and the outer periphery of the protective ring body is provided with mounting parts corresponding to the radial connecting blocks one by one. The mounting parts and the radial connecting blocks are engaged with each other. The protective ring body is also provided with a protective plate part covering the winding hook. The phase ring and the insulating protective ring can be better assembled and installed.

[0023] Furthermore, since the stator core includes an annular yoke, stator teeth, and an outer stator ring, the stator teeth are evenly distributed around the outer circumference of the annular yoke, forming stator slots between adjacent stator teeth. Stator pole shoes are provided at the outer ends of the stator teeth. The upper and lower insulating end caps respectively cover the annular yoke, stator teeth, and stator pole shoes. The outer stator ring has several mounting slots corresponding one-to-one with the stator pole shoes, and the stator pole shoes are embedded one-to-one into these mounting slots. During the forming and winding of the stator core, the enameled wire can be wound onto the stator teeth, at which point the outer stator ring does not need to be installed. This allows the winding to be completed on an automatic winding machine. After winding, the outer stator ring is then installed, thus shortening the winding time.

[0024] Furthermore, since the stator pole shoe includes an outer contour surface and an inner contour surface, the outer contour surface is an arc surface and is concentrically arranged with the annular yoke, and the inner contour surface is also an arc surface with a diameter larger than that of the outer contour surface, the inner contour of the stator pole shoe is more open to the outside, which allows for a greater amount of wire to be wound in the stator slots, resulting in a higher stator slot fill factor and thus better pump performance.

[0025] Furthermore, since the end cap is provided with a vent hole, a waterproof and breathable membrane is attached to the inner side of the end cap, and a protective arch is provided on the end cap outside the protective hole, and a side vent is provided on the side of the protective arch that communicates with the vent hole, the protective arch can protect the waterproof and breathable membrane and prevent it from being damaged by contact, while the side vent can also facilitate ventilation. Attached Figure Description

[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0027] Figure 1 This is a three-dimensional structural view of an embodiment of the present invention;

[0028] Figure 2 This is a three-dimensional view of another aspect of an embodiment of the present invention;

[0029] Figure 3 This is a top view of an embodiment of the present invention;

[0030] Figure 4 yes Figure 3 Sectional view at AA;

[0031] Figure 5 This is a perspective sectional view of the embodiment of the present invention with the top cover and impeller omitted;

[0032] Figure 6 This is a perspective view of the stator assembly according to an embodiment of the present invention;

[0033] Figure 7 This is a top view of the stator core;

[0034] Figure 8 It is a frontal perspective view of the phase loop and the insulating protective ring;

[0035] Figure 9 This is a three-dimensional view of the back of the phase ring and the insulating protective ring;

[0036] Figure 10 This is a three-dimensional view of the back of the phase ring;

[0037] 1. Outer shell; 11. Base plate; 12. Positioning ring sleeve; 13. Cooling ring sleeve; 14. Fluid cooling chamber; 2. Top cover; 21. Inlet; 22. Outlet; 3. End cover; 31. Protective arch; 32. Side vent; 4. Fluid chamber; 5. Spacer sealing assembly; 51. Spacer body; 52. Pressure cap; 521. First mounting protruding ring; 522. Second mounting protruding ring; 523. Third mounting protruding ring; 524. Fourth mounting protruding ring; 525. Connecting hole; 6. Rotor impeller assembly; 61. Central shaft; 62. Rotor body; 63. Central hole; 64. Lower shaft sleeve; 65. Upper shaft sleeve; 66. 7. Impeller; 8. Insulating protective ring; 9. Protective ring body; 10. Mounting part; 11. Protective plate part; 12. Stator assembly; 13. Stator core; 14. Circular yoke; 15. Stator teeth; 16. Stator pole shoe; 17. Stator outer ring; 18. Outer contour surface; 19. Inner contour surface; 10. Avoidance arc groove; 11. Stator winding; 12. Lower insulating end cover; 13. Winding groove; 14. Upper insulating end cover; 15. Phase ring; 16. Phase ring body; 17. Metal pin; 18. Radial connecting block; 19. Circular groove; 10. Metal connecting piece; 11. Winding hook; 12. Circuit board. Detailed Implementation

[0038] The present invention will be further described in detail below through specific embodiments.

[0039] like Figures 1 to 10As shown, a high-power brushless electronic water pump includes a housing 1 with one open end and a base plate 11 at the other end. A top cover 2 is installed at the open end of the housing 1, and an end cover 3 is installed at the lower end of the housing 1. A circuit board 10 receiving cavity is provided between the base plate 11 and the end cover 3, and a circuit board 10 is installed inside the circuit board 10 receiving cavity. In this embodiment, the housing 1 is a metal housing, which can effectively conduct all the internal heat to the outside. Therefore, the end cover 3 in this embodiment does not need to be a heat dissipation fin end cover 3, but can be a flat-bottomed end cover 3. The end cover 3 has vent holes, and a waterproof and breathable membrane is attached to the inner side of the end cover 3. A protective arch 31 is provided on the end cover 3 outside the protective hole, and a side vent 32 communicating with the vent holes is provided on the side of the protective arch 31. The number of side vents 32 is preferably three. The side vents 32 are located on the side, which can protect the waterproof and breathable membrane while also providing ventilation.

[0040] The outer casing 1 is further provided with a spacer sealing assembly 5, and a rotor assembly mounting cavity is provided within the spacer sealing assembly 5. A rotor impeller assembly 6 is rotatably mounted in the rotor assembly mounting cavity. The area between the spacer sealing assembly 5 and the upper cover 2 constitutes a fluid chamber 4. The upper cover 2 is provided with an inlet 21 and an outlet 22. A stator assembly 8 mounting cavity is formed between the spacer sealing assembly 5 and the outer casing 1. A stator assembly 8 is mounted in the stator assembly 8 mounting cavity. One end of the spacer sealing assembly 5 is clamped by the upper cover 2 and the outer casing 1, and the other end of the spacer sealing assembly 5 extends toward the base plate 11.

[0041] A cooling ring sleeve 13 protruding upwards is provided on the base plate 11. The spacer sealing assembly 5 is sealed to the cooling ring sleeve 13. The inner cavity of the cooling ring sleeve 13, the outer cavity between the outer cavity of the cooling ring sleeve 13 and the spacer sealing assembly 5 together form a fluid cooling chamber 14. A fluid flow gap is provided between the spacer sealing assembly and the rotor impeller assembly 6. The spacer sealing assembly is provided with multiple connecting holes 525 that connect the fluid chamber 4 to the fluid flow gap to facilitate fluid flow. The rotor impeller assembly 6 includes a central shaft 61, an impeller 66, and a rotor body 62. The lower end of the central shaft 61 is connected to the lower shaft sleeve 6. 4. Rotatably mounted on the cooling ring sleeve 13, the upper end of the central shaft 61 passes through the spacer sealing assembly and extends into the fluid chamber 4, the impeller 66 is fixed to the upper end of the central shaft 61 and located in the fluid chamber 4, the upper part of the central shaft 61 and the spacer sealing assembly are rotatably engaged by the upper shaft sleeve 65, the cooling ring sleeve 13 is provided with a connecting slot that connects the inner cavity and the outer cavity of the cooling ring sleeve 13, the central shaft 61 is provided with an axially penetrating central hole 63, so that the fluid flowing in from the fluid flow gap can enter the central hole 63 of the central shaft 61 through the connecting slot, and the central hole 63 connects the fluid cooling chamber 14 and the fluid chamber 4.

[0042] like Figure 4 and Figure 5 As shown, to make the view clearer, Figure 4 The structure of the stator assembly 8 is hidden in the middle. The spacer sealing assembly includes a spacer body 51 and a pressure cover 52. A positioning ring 12 is also provided on the bottom plate 11 outside the cooling ring 13. The lower end of the spacer body 51 is fitted into the positioning ring 12 and sealed. The pressure cover 52 includes a cover plate. The lower end of the cover plate is provided with a first mounting protrusion 521, a second mounting protrusion 522, a third mounting protrusion 523, and a fourth mounting protrusion 524 with gradually decreasing diameters. The first mounting protrusion 521, the second mounting protrusion 522, the third mounting protrusion 523, and the fourth mounting protrusion 524 are all concentrically arranged. The first mounting protrusion 521 is sealed to the outer shell 1. The upper end of the spacer body 51 is fitted between the second mounting protrusion and the third mounting protrusion 523 and sealed. The upper shaft sleeve 65 is installed between the fourth mounting protrusion 524 and the central shaft 61.

[0043] The lower end of the stator assembly 8 is also provided with an insulating protective ring 7 to prevent the metal parts of the stator assembly 8 from contacting the outer casing 1.

[0044] like Figures 6 to 10As shown, the stator assembly 8 includes a stator core 81 and an upper insulating end cover 84 and a lower insulating end cover 83 disposed at both ends of the stator core 81. A stator winding 82 is wound between the upper insulating end cover 84 and the lower insulating end cover 83. A phase ring 9 is fixed on the lower insulating end cover 83. The phase ring 9 includes a phase ring body 91 made of plastic. The phase ring body 91 is provided with a plurality of annular grooves 94. Three metal connecting pieces 95 are embedded in the annular grooves 94. Each metal connecting piece 95 is provided with an axially protruding metal pin 92. The metal pin 92 is used to electrically connect the circuit board 10 and the stator winding 82. Each metal connecting piece is provided with at least one winding hook 96 pointing to the center. The enameled wire of the stator winding 82 passes around the winding hook 96 and is welded to form a specified winding structure. The insulating protective ring 7 protects between the winding hook 96 and the positioning ring sleeve 12.

[0045] In this embodiment, the lower insulating end cover 83 is provided with three or six winding slots 831 for easy passage of enameled wire, and the winding hook 96 corresponds to the position of the winding slot 831. In this embodiment, there are six winding slots 831. During winding, only three or all six can be used. When using three winding slots 831, the stator windings 82 are connected in series to meet the 24V requirement. When using six winding slots 831, the stator windings 82 can be connected in parallel to meet the 12V requirement.

[0046] like Figures 8 to 10 As shown, the phase ring 9 is provided with at least three radially extending connecting blocks 93. The insulating protective ring 7 includes a protective ring body 71. The outer periphery of the protective ring body 71 is provided with mounting portions 72 corresponding to the radial connecting blocks 93. The mounting portions 72 and the radial connecting blocks 93 are engaged in a snap-fit ​​manner. Specifically, the snap-fit ​​is completed by snap-fit ​​pins and snap-fit ​​holes. In this embodiment, the snap-fit ​​pins are provided on the lower insulating end cap 83 to complete the snap-fit ​​between the two. The protective ring body 71 is also provided with a protective plate portion 73 covering the winding hooks 96. The protective plate portion 73 protects each winding hook 96, preventing the winding hooks 96 from contacting the outer shell 1.

[0047] like Figure 7As shown, the stator core 81 includes an annular yoke 811, stator teeth 812, and an outer stator ring 814. The stator teeth 812 are evenly distributed around the outer periphery of the annular yoke 811, and stator slots are formed between adjacent stator teeth 812. The outer end of the stator teeth 812 is provided with a stator pole shoe 813. The upper insulating end cap 84 and the lower insulating end cap 83 respectively cover the annular yoke 811, the stator teeth 812, and the stator pole shoe 813. The outer stator ring 814 is provided with a plurality of mounting slots corresponding one-to-one with the stator pole shoes 813, and the stator pole shoes 813 are embedded one-to-one into the mounting slots. The stator pole shoe 813 includes an outer contour surface 815 and an inner contour surface 816. The outer contour surface 815 is an arc surface and is concentrically arranged with the annular yoke 811. The inner contour surface 816 is also an arc surface, and the diameter of the inner contour surface 816 is larger than the diameter of the outer contour surface 815. The inner circumferential surface of the stator outer ring 814 is provided with a clearance arc groove 817 that matches the inner contour surface 816 of the stator pole shoe 813.

[0048] like Figure 7 As shown in the figure, the radius of the outer contour surface 815 is R1, the radius of the inner contour surface 816 is R3, and the radius of the annular yoke 811 is R2. The radius R1 of the outer contour surface 815 is equal to the radius R2 of the annular yoke 811, while the radius R3 of the inner contour surface 816 is greater than R1. The curvature of the inner contour surface 816 of the stator pole shoe 813 is smaller than the curvature of the outer contour surface 815. The auxiliary line C in the figure indicates that when winding the stator slot, the enameled wire can be wound better from the outer end of the stator pole shoe 813, and the arc-shaped slot 817 can also avoid more enameled wire. In this way, the enameled wire can be wound to the outer side, and the stator slot fullness is higher.

[0049] The above-described embodiments are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Any modifications and alterations made to the technical solutions of the present invention without departing from the spirit of the present invention shall fall within the protection scope defined by the claims of the present invention.

Claims

1. A high-power brushless electronic water pump, comprising a housing with one open end and a base plate at the other end, a top cover installed at the open end of the housing, and an end cover installed at the lower end of the housing, a circuit board receiving cavity provided between the base plate and the end cover, a circuit board installed in the circuit board receiving cavity, a spacer sealing assembly provided inside the housing, a rotor assembly mounting cavity provided inside the spacer sealing assembly, a rotor impeller assembly rotatably mounted in the rotor assembly mounting cavity, a fluid chamber formed between the spacer sealing assembly and the top cover, an inlet and an outlet provided on the top cover, a stator assembly mounting cavity formed between the spacer sealing assembly and the housing, a stator assembly installed in the stator assembly mounting cavity; one end of the spacer sealing assembly is clamped by the top cover and the housing, and the other end of the spacer sealing assembly extends toward the base plate, characterized in that: A cooling ring is provided on the base plate, and the spacer sealing assembly is sealed to the cooling ring. The inner cavity of the cooling ring, the outer cavity between the cooling ring and the spacer sealing assembly together form a fluid cooling chamber. A fluid flow gap is provided between the spacer sealing assembly and the rotor impeller assembly. The spacer sealing assembly is provided with a connecting hole that connects the fluid chamber to the fluid flow gap. The rotor impeller assembly includes a central shaft, an impeller, and a rotor body. The lower end of the central shaft is rotatably mounted on the cooling ring via a lower shaft sleeve. The upper end of the central shaft passes through the spacer sealing assembly and extends into the fluid chamber. The impeller is fixed to the upper end of the central shaft and located within the fluid chamber. The cooling ring and the spacer sealing assembly are rotatably fitted by the upper bushing. The cooling ring sleeve has a connecting slot that connects the inner and outer cavities of the cooling ring sleeve. The central shaft has an axially penetrating central hole that connects the fluid cooling chamber and the fluid chamber. The outer shell is a metal shell. The lower end of the stator assembly is also provided with an insulating protective ring to prevent the metal parts of the stator assembly from contacting the outer shell. The stator assembly includes a stator core and upper and lower insulating end covers located at both ends of the stator core. A stator winding is wound between the upper and lower insulating end covers. A phase ring is fixed on the lower insulating end cover. The phase ring includes a phase ring body made of plastic. The phase ring body has several annular grooves, and the annular grooves are embedded with... The stator has three metal connecting pieces, each with an axially protruding metal pin and at least one winding hook pointing towards the center. The enameled wire of the stator winding passes around the winding hook and is welded to form a specified winding structure. An insulating protective ring protects the winding hook and the positioning ring sleeve. The phase ring body has at least three radially extending connecting blocks. The insulating protective ring includes a protective ring body, and the outer periphery of the protective ring body has mounting portions corresponding to the radial connecting blocks. The mounting portions are engaged with the radial connecting blocks. The protective ring body also has a protective plate covering the winding hook. The stator core includes an annular yoke and a stator... The stator teeth are evenly distributed around the outer circumference of the annular yoke, forming stator slots between adjacent teeth. Stator pole shoes are provided at the outer ends of the stator teeth. Upper and lower insulating end caps cover the annular yoke, stator teeth, and stator pole shoes, respectively. The stator outer ring has several mounting slots corresponding to the stator pole shoes, and the stator pole shoes are embedded in these slots. Each stator pole shoe includes an outer contour surface and an inner contour surface. The outer contour surface is an arc surface and concentrically aligned with the annular yoke. The inner contour surface is also an arc surface, with a diameter larger than that of the outer contour surface. An avoidance arc-shaped groove matching the inner contour surface of the stator pole shoe is provided on the inner circumference of the stator outer ring.

2. The high-power brushless electronic water pump as described in claim 1, characterized in that: The spacer sealing assembly includes a spacer body and a pressure cap. A positioning ring is also provided on the base plate outside the cooling ring. The lower end of the spacer body is fitted into the positioning ring and sealed. The pressure cap includes a cover plate. The lower end of the cover plate is provided with a first mounting protrusion, a second mounting protrusion, a third mounting protrusion, and a fourth mounting protrusion with gradually decreasing diameters. The first mounting protrusion is sealed to the outer shell. The upper end of the spacer body is fitted between the second and third mounting protrusions and sealed. The upper shaft sleeve is installed between the fourth mounting protrusion and the central shaft.

3. A high-power brushless electronic water pump as described in claim 2, characterized in that: The lower insulating end cap is provided with three or six winding grooves to facilitate the passage of enameled wire, and the winding hooks correspond to the positions of the winding grooves.

4. A high-power brushless electronic water pump as described in claim 3, characterized in that: The end cap is provided with a vent hole, and a waterproof and breathable membrane is attached to the inner side of the end cap. A protective arch is provided on the end cap outside the protective hole, and a side vent is provided on the side of the protective arch that communicates with the vent hole.

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