Centrifugal electronic water pump for thermal management system of electric vehicle

Abstract

The utility model discloses a centrifugal electronic water pump for a thermal management system of an electric automobile. The centrifugal electronic water pump comprises a pump body sub-component, a motor body sub-component and a water pump motor controller, the centrifugal pump shell, the centrifugal pump waterproof sleeve and the motor shell are connected and fixed through five screws; and mechanism assembly of the pump body sub-component and the motor body sub-component is completed. A water pump motor controller is connected and fixed in a cavity at the rear end of a motor shell through screws, then a three-phase power supply terminal connecting line and a power supply connector terminal connecting line of a confluence plate binding post are welded and fixed with a circuit board of the water pump motor controller, and a rear cover and the motor shell are screwed and fixed through four screws. The centrifugal electronic water pump has the working characteristics of large flow, high lift, low noise, safety and reliability, is an energy-saving and environment-friendly high-tech product, and is particularly suitable for an electric vehicle thermal management system with higher requirements on modularization, light weight and integration; the mechanism is compact in structure, good in sealing performance, low in cost and easy to assemble and maintain.

Description

TECHNICAL FIELD

[0001] The utility model belongs to electric automobile device, accessory technical field, concretely relates to a centrifugal electronic water pump for electric automobile thermal management system. BACKGROUND

[0002] With the rapid development of new energy automobile industry, especially the dynamic response performance requirement of electric automobile intelligent cockpit and power battery pack cooling system and electric drive module cooling system to electric automobile thermal management system is also higher and higher. Electronic water pump is the key component in electric automobile thermal management system, and its performance level significantly affects the efficiency of electric automobile thermal management system. The centrifugal electronic water pump has the working characteristics of large flow, high lift, low noise and safety and reliability, is one of energy-saving, safe and environmentally friendly high-tech electric automobile thermal management system devices, and is the best choice for electric automobile thermal management system for pure electric vehicles (EV) and hybrid electric vehicles (HEV).

[0003] For the early electric water pump, on the one hand, the traditional DC drive motor has the problems of large noise, low rated speed, small output power, low efficiency and large heat generation; on the other hand, the pump head and the motor are completely separated, the space volume is large, and it is not conducive to the development of the electric automobile thermal management system towards the modularization, light weight and integration. In the current technical application, the motor shaft, the stator core and the stator coil are integrally injection molded, and then the injection molded stator core is pressed into the motor shell with interference, and the motor rotor is coupled with the water pump impeller to rotate around the motor shaft. Since the cooling liquid not only corrodes the motor rotor assembly, but also contains large particles of impurities, it is easy to cause abnormal wear of the motor rotor assembly, the motor speed attenuation increases, and the performance of the electric water pump decreases significantly. In addition, the stator core of the integrated injection molding is prone to fine cracks when the coil winding is deformed and vibrated, which causes the cooling liquid to leak and damages the coil winding, and finally leads to the overall failure of the electric water pump. The compatibility of the electric water pump parts is poor, and the manufacturing cost is high. Therefore, how to provide a centrifugal electronic water pump with long service life, simple assembly process and lower cost, which adopts pump body parts and motor body parts and high integration of water pump motor controller, has a broader market prospect. SUMMARY

[0004] In view of the above problems of the electric water pump, the utility model aims at providing a centrifugal electronic water pump for electric automobile thermal management system, which can realize large flow, high lift and low noise continuous and stable output of the centrifugal electronic water pump, and ensure the efficient operation of the electric automobile thermal management system while meeting the structural strength of the centrifugal electronic water pump, the modularization and integration design requirements of the thermal management system.

[0005] The centrifugal electronic water pump for the electric vehicle thermal management system comprises a pump body subcomponent, a motor body subcomponent and a water pump motor controller, the pump body subcomponent is provided with a motor rotor assembly, a motor shaft, a centrifugal pump bearing seat, a centrifugal pump impeller, an impeller anti-loosening screw, bearing one, bearing two, a centrifugal pump shell, a pump shell sealing ring and a centrifugal pump water jacket, the bearing two and the bearing chamber of the centrifugal pump bearing seat are assembled in interference, the inner ring of the bearing two and the impeller insert arranged on the centrifugal pump impeller are sequentially assembled with the large end of the motor shaft in interference, the centrifugal pump impeller is axially fixed by using the impeller anti-loosening screw, and the small end of the motor shaft is provided with the bearing one, the bearing one, the centrifugal pump bearing seat and their assemblies are sequentially and slidably assembled into the bearing chamber at the bottom of the centrifugal pump water jacket and the limiting circular cavity at the top, and the centrifugal pump bearing seat is tightly fixed on the end face of the centrifugal pump water jacket by four fastening screws, the motor body subcomponent is provided with a motor shell, a stator core, a stator core fixing screw, a stator insert, a stator winding, a busbar terminal and a motor shell sealing ring, the stator core limiting boss arranged on the stator core is aligned and matched with the motor shell limiting groove arranged on the motor shell to be prepositioned, the stator core and the coil winding thereon are assembled in transition fit in the circular cavity of the motor shell, and the stator core and the assemblies thereof are coupled and fixed with the motor shell by using two stator core fixing screws, the centrifugal pump water jacket and the assemblies thereon are assembled with the motor body subcomponent, the outer cylindrical surface at the bottom of the centrifugal pump water jacket is transitionally assembled with the bearing chamber in the motor shell, and the five through holes on the top plane of the centrifugal pump water jacket are aligned with the five threaded holes on the front end face of the motor shell one by one, the centrifugal pump shell is assembled to the centrifugal pump water jacket in the same way, the five through holes on the centrifugal pump shell are aligned with the five through holes on the top plane of the centrifugal pump water jacket one by one, and the centrifugal pump shell, the centrifugal pump water jacket and the motor shell are coupled and fixed by five screws, and the mechanism assembly of the pump body subcomponent and the motor body subcomponent is completed.

[0006] The water pump motor controller is coupled and fixed in the rear end cavity of the motor shell by screws, the three-phase power terminal connecting lines of the busbar terminal are welded and fixed with the circuit board of the water pump motor controller, the power connector is coated with sealing glue on the contact surface of the motor shell, and the power connector and the motor shell are tightly fixed by four screws, the power connector terminal connecting lines are welded and fixed with the circuit board of the water pump motor controller, the rear cover and the motor shell are tightly fixed by four screws, and the rear cover sealing gasket is pressed and assembled between the rear cover and the motor shell.

[0007] The above technical problems of the utility model are solved by the following technical scheme:

[0008] A centrifugal electronic water pump for electric vehicle thermal management system, characterized in that it comprises a back cover, a magnetic ring limiting D-shaped cavity, a water pump motor controller, an injection hole cavity, a magnetic pole position identification boss, a back cover gasket, a motor housing, a motor housing sealing ring, a bus bar, a motor housing limiting groove, a stator core limiting boss, a water jacket positioning column one, a fastening screw, a stator core, a stator core fixing screw, a stator insert, a centrifugal pump water jacket, a water jacket positioning column two, a motor rotor assembly, an impeller anti-loosening screw, a bearing one, a bearing two, a stator winding, a motor shaft, a magnetic ring support sleeve, a magnetic ring, a magnetic ring injection sleeve, a centrifugal pump bearing seat, a bearing seat counterbore, a filter screen, a centrifugal pump impeller, a centrifugal pump housing, a nut insert, an impeller insert, a pump housing sealing ring, a shock pad assembly, and a power connector.

[0009] The motor rotor assembly is provided with the magnetic ring support sleeve, the magnetic ring, and the magnetic ring injection sleeve, the motor shaft is arranged in a regular hexahedron, two shaft shoulders for limiting the magnetic ring support sleeve are arranged on the motor shaft, a left-hand thread hole is arranged on the end face of the large end of the motor shaft, the magnetic ring support sleeve is designed in a D-shaped form, the inner hole of the magnetic ring support sleeve is designed in a regular hexahedral cavity, six injection hole cavities are arranged on the magnetic ring support sleeve, and the magnetic ring is provided with the magnetic ring limiting D-shaped cavity and the magnetic pole position identification boss; the small end of the motor shaft is interference-fitted with the bearing one, one magnetic ring support sleeve is interference-pressed on each end of the motor shaft and abuts against the shaft shoulder arranged on the motor shaft, the magnetic ring is pre-positioned and sleeved on the magnetic ring support sleeve through the magnetic ring limiting D-shaped cavity, the magnetic ring, the magnetic ring support sleeve, and the motor shaft are injection-coupled and fixed through the injection hole cavities, the magnetic ring injection sleeve completely covers the magnetic ring support sleeve and the magnetic ring, so that direct contact of the magnetic ring support sleeve and the magnetic ring with the cooling liquid is avoided, and corrosion of the cooling liquid on the magnetic ring support sleeve and the magnetic ring is eliminated; the magnetic ring is circumferentially and radially magnetized through the magnetic pole position identification boss, and the number of magnetic poles of the magnetic ring is arranged as 2 pairs of poles or 3 pairs of poles; the bearing one is arranged as a dust-proof ring-free semi-ceramic deep groove ball bearing or a dust-proof ring-free engineering plastic deep groove ball bearing, which has better wear resistance, corrosion resistance, self-lubrication, and other characteristics.

[0010] The centrifugal pump bearing seat is provided with the bearing seat countersunk hole, the bearing chamber is arranged on the centrifugal pump bearing seat, the centrifugal pump bearing seat is fixed on the end face of the centrifugal pump water jacket by the four fastening screws, the nut insert and the four nuts, the axial displacement of the centrifugal pump bearing seat is limited, and the problem of axial displacement of the rotating shaft of the centrifugal electronic water pump is solved; the filter screen is assembled in the bearing chamber of the centrifugal pump bearing seat, the filter screen filters the larger impurities in the cooling liquid and flows into the circular cavity of the centrifugal pump water jacket, and the air in the circular cavity of the centrifugal pump water jacket is discharged; the larger impurities are prevented from blocking the bearing raceways of the bearing one and the bearing two, the bearing noise and abnormal wear of the bearing are effectively reduced, the bearing two is assembled in the bearing chamber of the centrifugal pump bearing seat, the bearing two is a dust-proof ring-free semi-ceramic deep groove ball bearing or a dust-proof ring-free engineering plastic deep groove ball bearing, and the bearing two has the characteristics of better wear resistance, corrosion resistance and self-lubrication.

[0011] The centrifugal pump impeller is provided with the impeller insert, the impeller insert is beneficial to enhancing the structural strength and coupling stiffness of the centrifugal pump impeller, and the rotating speed and rotating accuracy of the centrifugal pump impeller are greatly improved; the circular groove is arranged on the end face of the centrifugal pump shell, and the pump shell sealing ring is arranged in the circular groove.

[0012] The centrifugal pump water jacket is provided with the water jacket positioning column one, the water jacket positioning column two and the nut insert; the circular cavity is arranged at the center position of the end face of the centrifugal pump water jacket, the centrifugal pump bearing seat is assembled in the circular cavity arranged at the center position of the end face of the centrifugal pump water jacket, the water jacket positioning column one corresponds to the motor shell limiting groove, the water jacket positioning column two corresponds to another limiting groove arranged on the motor shell, the bearing chamber is arranged at the bottom of the inner circular cavity of the centrifugal pump water jacket and is in sliding assembly with the bearing one, the outer cylinder at the bottom of the centrifugal pump water jacket is assembled in the bearing chamber arranged at the bottom of the circular cavity of the motor shell; three small threaded holes are arranged on the end face of the outer cylinder at the bottom of the centrifugal pump water jacket.

[0013] The bearing chamber of the centrifugal pump bearing seat is interference fitted with the bearing two, the motor shaft is injection coupled and fixed with the motor rotor assembly, the inner ring of the bearing two is interference pressed in the bearing position of the large end of the motor shaft, the centrifugal pump impeller is interference fitted on the motor shaft through the impeller insert, the anti-loose screw of the impeller is tightened and abuts against the end face of the impeller insert, preventing the centrifugal pump impeller from falling off due to loosening; the centrifugal pump impeller and its assembly are assembled with the centrifugal pump water jacket, the bearing one is slidingly assembled in the bearing chamber at the bottom of the circular cavity of the centrifugal pump water jacket, the centrifugal pump bearing seat is assembled in the circular cavity at the center position of the end face of the centrifugal pump water jacket, the centrifugal pump bearing seat is tightened and fixed on the end face of the centrifugal pump water jacket through the four fastening screws and the nut insert, limiting the axial displacement of the centrifugal pump bearing seat, the centrifugal pump shell assembled with the pump shell sealing ring is installed on the end face of the centrifugal pump water jacket, the five screw through holes on the centrifugal pump shell are aligned with the five screw through holes on the end face of the centrifugal pump water jacket; the assembly of the pump body sub-components is completed.

[0014] The motor shell is provided with the motor shell limiting groove, an oval annular rectangular groove is arranged on the front end surface of the motor shell, the motor shell sealing ring is installed in the arranged oval annular rectangular groove, five threaded holes are further arranged on the front end surface of the motor shell, four symmetrically distributed shock pad mounting holes are arranged on the bottom of the motor shell, four shock pad assemblies are installed in the four shock pad mounting holes, and two inclined cavities are arranged on the bottom plane of the two cavities with the cavity center line as the center; the stator core is provided with the stator core limiting boss, the stator core limiting boss is paired and positioned with the motor shell limiting groove, two bosses are arranged on the outer cylindrical surface of the stator core with the outer cylindrical surface center line as the center, and one threaded hole is arranged on each of the two bosses; the number of teeth and slots of the stator core is set to 6 slots or 9 slots, the stator winding adopts fractional slot concentrated winding design; one stator insert piece is inserted and mounted at each end of the stator core, the inside of the stator insert piece is wound with single-layer copper enameled wire, the wire diameter specification of the copper enameled wire is 0.90 mm or 1.00 mm, the coils of the stator winding are connected by Δ (delta) connection, the three-phase power terminal wires of the stator winding are welded and connected with the bus bar binding post, the stator core and its assemblies are assembled in the circular cavity of the motor shell by aligning and pre-positioning the stator core limiting boss and the motor shell limiting groove, and then the stator core and its assemblies are connected and fixed with the motor shell by using two stator core fixing screws, the assembly joint surface between the stator core and the motor shell is coated with insulating heat-conducting silicone, thereby improving the heat conduction and anti-vibration performance of the stator core and its assemblies; the mechanism assembly of the motor body sub-components is completed.

[0015] The bottom outer cylinder of the water pump water jacket is installed in the bearing chamber arranged at the bottom of the circular cavity of the motor shell, five through holes on the centrifugal pump shell are aligned with five through holes on the top plane of the centrifugal pump water jacket, five screws are used to fix the centrifugal pump shell, the centrifugal pump water jacket and the motor shell, and three screws are used to tighten the centrifugal pump water jacket and the motor shell; the water pump motor controller is fixed in the rear end cavity of the motor shell by screws, and the three-phase power terminal connecting lines of the busbar are welded and fixed to the circuit board of the water pump motor controller; the power connector is fixed and tightened to the motor shell by four screws, the terminal connecting lines of the power connector are also welded and fixed to the circuit board of the water pump motor controller, the rear cover is fixed and tightened to the motor shell by four screws, and the rear cover gasket is pressed between the rear cover and the motor shell; the utility model greatly reduces the complexity of mechanism assembly and significantly improves the qualified rate of finished product assembly.

[0016] In conclusion, the utility model has the following beneficial effects:

[0017] 1, the innovative design motor rotor assembly overall plastic structure eliminates the failure situation caused by the corrosion of the cooling liquid to the rotor magnetic ring, and has very low fluid friction resistance and high rotor dynamic balance performance, the technical scheme of magnetizing the magnetic ring after injection molding avoids the local demagnetization phenomenon of the magnetic ring caused by high temperature and high humidity, and ensures that the surface magnetic intensity of the magnetic ring is uniform;

[0018] 2, the dustproof ring-free semi-porcelain deep groove ball bearing or the dustproof ring-free engineering plastic deep groove ball bearing is adopted, which has the characteristics of high speed, low noise, light weight, wear resistance and corrosion resistance, especially self-lubricating, and is particularly suitable for long-term operation in cooling liquid;

[0019] 3, the utility model integrates the motor rotor assembly into the centrifugal pump water jacket of the pump body subcomponent, so that the cooling liquid in the pump shell is completely separated from the motor stator winding coil, and the failure of the motor stator winding coil and the water pump motor controller caused by cooling liquid leakage is avoided;

[0020] 4, the utility model adopts the technical scheme that two stator core fixing screws are used to fix the stator core assembly in the motor shell cavity, compared with the way of interference press-fitting of the stator core, the utility model is especially convenient to disassemble and assemble, greatly reduces the complexity of assembly, and significantly improves the qualified rate of finished product assembly;

[0021] 5, The utility model discloses the assembly joint surface of the stator core with motor casing is coated with insulating heat-conducting silica gel, which is beneficial to improve the heat conduction and anti-vibration performance of the stator core and its components, reduce the iron loss of the stator core and the copper loss of the winding coil, and improve the motor output power.

[0022] 6, The utility model discloses effectively compensate the size tolerance of the assembly of relevant parts, limit the axial displacement of the centrifugal pump bearing seat, solve the problem of the axial movement of the rotating shaft of the centrifugal electronic water pump.

[0023] 7, The utility model discloses the larger particle impurity in cooling liquid is filtered after flowing into the round cavity inside of the centrifugal pump water jacket through the filter screen, and the air in the round cavity inside of the centrifugal pump water jacket is discharged, which reduces the blockage of the bearing raceway of the bearing one and the bearing two by larger particle impurities, effectively reduces the bearing abnormal noise and abnormal wear of the bearing.

[0024] 8, The utility model discloses compact structure, good sealing, high integration, application speed closed loop drive control strategy, lower cost, especially suitable for the higher requirement of modularization, light weight, integration of electric automobile thermal management system. BRIEF DESCRIPTION OF DRAWINGS

[0025] The accompanying drawings incorporated in and forming a part of the specification illustrate embodiments of the application and, together with the description, serve to explain the principles of the application.

[0026] Figure 1 It is the three-dimensional assembly structure explosion schematic drawing of the utility model;

[0027] Figure 2 It is the whole assembly cross section structure schematic drawing of the utility model;

[0028] Figure 3 It is the motor stator core and its component assembly schematic drawing of the utility model;

[0029] Figure 4 It is the centrifugal pump impeller and motor rotor component assembly cross section schematic drawing of the utility model;

[0030] Figure 5 It is the motor rotor component assembly structure schematic drawing of the utility model;

[0031] Figure 6 It is the centrifugal pump water jacket structure schematic drawing of the utility model.

[0032] In the drawing: 1. rear cover; 2. magnetic ring limiting D-shaped cavity; 5. water pump motor controller; 6. injection hole cavity; 7. magnetic pole position identification boss; 10. rear cover sealing gasket; 15. motor shell; 20. motor shell sealing ring; 25. busbar terminal post; 26. motor shell limiting groove; 27. stator core limiting boss; 28. water jacket positioning column one; 30. fastening screw; 35. stator core; 36. stator core fixing screw; 40. stator insert; 45. centrifugal pump water jacket; 46. water jacket positioning column two; 50. motor rotor assembly; 51. impeller anti-loosening screw; 53. bearing one; 55. bearing two; 56. stator winding; 58. filter screen; 60. motor shaft; 61. magnetic ring support sleeve; 62. magnetic ring; 63. magnetic ring injection sleeve; 65. centrifugal pump bearing seat; 68. bearing seat counterbore; 70. centrifugal pump impeller; 75. centrifugal pump shell; 81. nut insert; 82. impeller insert; 85. pump shell sealing ring; 90. shock pad assembly; 95. power connector. DETAILED DESCRIPTION

[0033] The present application will be further described with reference to the drawings. It should be noted that the relative arrangement of components and steps set forth in these examples, numerical values, unless otherwise specifically stated, do not limit the scope of the present application.

[0034] The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the scope of the present application, its application, or uses. In the examples shown and discussed herein, any specific values should be interpreted as illustrative only and not as a limitation. Other examples of the exemplary embodiment can have different values. It should be noted that like numbers and letters refer to like items throughout the several views of the drawings, and therefore, once an item is defined in one view, it is not necessary to discuss it further in subsequent views.

[0035] The terms "comprise", "have", "include", "established", "set up", "set as", "set", and any variations thereof in the specification and claims of this application and in the above drawings, are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or device that includes a series of steps or units does not have to be limited to only those steps or units clearly listed, but can include other steps or units that are not clearly listed or inherent to these processes, methods, products, or devices;

[0036] In the description of the utility model, it is understood that the orientation or position relation indicated by the terms "center", "alignment", "positioning", "axial", "radial", "circular cavity", "circular ring", "circumference", "large", "small", "upper", "left", "inner", "outer" and the like is based on the orientation or position relation shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and is not indicative or suggestive of the devices or elements indicated having a specific orientation, being constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model; unless otherwise explicitly specified and limited; in addition, the terms "mounting", "assembly", "coupling", "fixing" and the like should be understood broadly, for example, it can be fixedly coupled, or it can be detachably coupled, or integrally coupled; it can be mechanically coupled, or it can be electrically coupled; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be connected internally between two elements. For ordinary skilled persons in the art, the specific meaning of the above-mentioned terms in the utility model can be understood according to the specific circumstances.

[0037] The utility model discloses a centrifugal electronic water pump for electric automobile heat management system, including, back cover 1, magnetic ring limit D type cavity 2, water pump motor controller 5, injection hole cavity 6, magnetic pole position mark boss 7, back cover sealing washer 10, motor casing 15, motor casing sealing ring 20, busbar 25, motor casing limit groove 26, stator core limit boss 27, water jacket locating post no. 28, fastening screw 30, stator core 35, stator core fixed screw 36, stator insert piece 40, centrifugal pump water jacket 45, water jacket locating post no. 46, motor rotor assembly 50, impeller lock screw 51, bearing no. 53, bearing no. 55, stator winding 56, filter screen 58, motor shaft 60, magnetic ring support sleeve 61, magnetic ring 62, magnetic ring injection sleeve 63, centrifugal pump bearing seat 65, bearing seat countersunk hole 68, centrifugal pump impeller 70, centrifugal pump casing 75, nut insert 81, impeller insert 82, pump casing sealing ring 85, shock pad assembly 90, power connector 95.

[0038] The utility model discloses the motor rotor assembly 50 shown in the drawing of the utility model is equipped with magnetic ring support sleeve 61, magnetic ring 62, magnetic ring injection sleeve 63, and the motor shaft 60 is set up as regular hexahedron, is equipped with two shaft shoulders that limit magnetic ring support sleeve 61 on the motor shaft 60, is equipped with a left-hand thread hole on the end face of the big end of motor shaft 60, the appearance design of magnetic ring support sleeve 61 is D type shape, the inner hole design of magnetic ring support sleeve 61 is regular hexahedron shape cavity, is equipped with six injection hole cavities 6 on magnetic ring support sleeve 61, and magnetic ring 62 is equipped with magnetic ring limit D type cavity 2, magnetic pole position mark boss 7;The magnetic pole number of magnetic ring 62 is set up as 2 pairs of poles or 3 pairs of poles, and the motor shaft 60 is injection coupled with motor rotor assembly 50 and is fixed;

[0039] The centrifugal pump bearing seat 65 shown in the utility model drawings is provided with a bearing seat counterbore 68, the centrifugal pump bearing seat 65 is provided with a bearing chamber, the bearing chamber of the centrifugal pump bearing seat 65 is provided with an interference assembly filter screen 58, and the centrifugal pump impeller 70 is provided with an impeller insert 82;

[0040] The centrifugal pump water jacket 45 shown in the utility model drawings is provided with a water jacket positioning column one 28, a water jacket positioning column two 46 and a nut insert 81, the center position of the end surface of the centrifugal pump water jacket 45 is provided with a circular cavity, the bottom of the circular cavity in the centrifugal pump water jacket 45 is provided with a bearing chamber for sliding assembly of the bearing one 53, and the bottom of the circular cavity in the centrifugal pump water jacket 45 is provided with three small threaded holes;

[0041] The centrifugal pump casing 75 shown in the utility model drawings is provided with a circular annular groove on the end surface, and the pump casing sealing ring 85 is installed in the circular annular groove;

[0042] The motor casing 15 shown in the utility model drawings is provided with a motor casing limiting groove 26, the front end surface of the motor casing 15 is provided with an oval annular rectangular groove, the motor casing sealing ring 20 is installed in the oval annular rectangular groove, the front end surface of the motor casing 15 is further provided with five threaded holes, the bottom of the motor casing 15 is provided with four symmetrically distributed damping pad mounting holes, four damping pad assemblies 90 are installed in the four damping pad mounting holes, the inner circular cavity of the motor casing 15 is provided with two type cavities which are arranged to be inclined to the left with the cavity central axis as the center, and each of the bottom planes of the two type cavities is provided with a threaded hole; the stator core 35 is provided with a stator core limiting boss 27, the stator core limiting boss 27 is positioned in pairs with the motor casing limiting groove 26, the outer cylindrical surface of the stator core 35 is provided with two bosses which are arranged to be symmetrical with the outer cylindrical surface central axis as the center, and each of the two bosses is provided with a threaded through hole; the number of teeth and slots of the stator core 35 is set to be six slots or nine slots, and the stator winding 56 adopts a fractional slot concentrated winding design; one stator insert 40 is inserted at each end of the stator core 35, the stator insert 40 is wound by single-stacked copper enameled wire, the wire diameter specification of the copper enameled wire is 0.90 mm or 1.00 mm, and the coil of the stator winding 56 adopts a Δ (delta) connection method;

[0043] The bearing one 53 shown in the utility model drawings is a dustproof half-titanium deep groove ball bearing or a dustproof engineering plastic deep groove ball bearing; the bearing two 55 is a dustproof half-titanium deep groove ball bearing or a dustproof engineering plastic deep groove ball bearing.

[0044] Further, the small end of the motor shaft 60 is interference fitted with bearing one 53, and a magnetic ring support sleeve 61 is interference pressed on the motor shaft 60 from both ends and abuts against the shaft shoulder provided on the motor shaft 60, the magnetic ring 62 is sleeved on the magnetic ring support sleeve 61 through the magnetic ring limiting D-shaped cavity 2, the magnetic ring 62, the magnetic ring support sleeve 61 and the motor shaft 60 are injection molded and fixed, the magnetic ring injection sleeve 63 completely covers the magnetic ring support sleeve 61 and the magnetic ring 62, avoiding direct contact of the magnetic ring support sleeve 61 and the magnetic ring 62 with the cooling liquid, eliminating the corrosion of the cooling liquid on the magnetic ring support sleeve 61 and the magnetic ring 62; the magnetic ring 62 is radially magnetized along the circumference through the magnetic pole position identification boss 7.

[0045] Further, the filter screen 58 is first interference fitted in the bearing chamber provided in the centrifugal pump bearing seat 65, the filter screen 58 filters the larger impurities in the cooling liquid and flows into the circular cavity inside the centrifugal pump water jacket 45, and at the same time, the air in the circular cavity of the centrifugal pump water jacket 45 is discharged, then the bearing two 55 is interference fitted in the bearing chamber provided in the centrifugal pump bearing seat 65, the inner ring of the bearing two 55 is interference pressed on the bearing position provided at the large end of the motor shaft 60, the centrifugal pump impeller 70 is interference fitted on the motor shaft 60 through the impeller insert 82, the impeller anti-loosening screw 51 is tightened against the end face of the impeller insert 82 to prevent the centrifugal pump impeller 70 from falling off due to loosening, the centrifugal pump impeller 70 and its assembly are assembled with the centrifugal pump water jacket 45, the bearing one 53 is slidingly fitted in the bearing chamber provided at the bottom of the circular cavity of the centrifugal pump water jacket 45, the centrifugal pump bearing seat 65 is assembled in the circular cavity provided at the center of the end face of the centrifugal pump water jacket 45, the centrifugal pump bearing seat 65 is tightened and fixed on the end face of the centrifugal pump water jacket 45 through the four fastening screws 30 and the nut insert 81 to limit the axial displacement of the centrifugal pump bearing seat 65, then the centrifugal pump housing 75 assembled with the pump housing sealing ring 85 is installed on the end face of the centrifugal pump water jacket 45, and the five screw through holes provided on the centrifugal pump housing 75 are aligned with the five screw through holes provided on the end face of the centrifugal pump water jacket 45; the assembly of the pump body sub-components is completed.

[0046] Further, the three-phase power terminal wires of the stator winding 56 are welded and connected with the busbar posts 25, the stator core limiting boss 27 is aligned and pre-positioned with the motor housing limiting groove 26, the stator core 35 and its assembly are transitionally fitted and assembled in the circular cavity of the motor housing 15, then two stator core fixing screws 36 are used to connect and fix the stator core 35 and its assembly with the motor housing 15, and the assembly joint surface of the stator core 35 and the motor housing 15 is coated with insulating and heat-conducting silicone to improve the heat conduction and anti-vibration performance of the stator core 35 and its assembly; the assembly of the motor body sub-components is completed.

[0047] Further, the assembled pump body sub-assembly and motor body sub-assembly are assembled, the outer cylinder at the bottom of the centrifugal pump water jacket 45 is installed in the bearing chamber at the bottom of the circular cavity of the motor housing 15, the water jacket positioning column one 28 corresponds to the motor housing limiting groove 26, the water jacket positioning column two 46 corresponds to another limiting groove of the motor housing 15, the five through holes on the centrifugal pump housing 75 are aligned with the five through holes on the top plane of the centrifugal pump water jacket 45, and five screws are used to fix the centrifugal pump housing 75, the centrifugal pump water jacket 45 and the motor housing 15, and three screws are used to tighten the centrifugal pump water jacket 45 and the motor housing 15;

[0048] Further, the water pump motor controller 5 is fixed to the rear end cavity of the motor housing 15 by screws, and the three-phase power terminal connecting lines of the busbar terminal 25 are welded and fixed to the circuit board of the water pump motor controller 5; the power connector 95 and the installation contact surface of the motor housing 15 are coated with sealing glue, and the power connector 95 and the motor housing 15 are tightly fixed by four screws, the terminal connecting lines of the power connector 95 are also welded and fixed to the circuit board of the water pump motor controller 5, the rear cover 1 and the motor housing 15 are tightly fixed by four screws, and the rear cover gasket 10 is pressed between the rear cover 1 and the motor housing 15; the utility model greatly reduces the complexity of mechanism assembly and significantly improves the qualified rate of finished product assembly.

[0049] In addition to the above, although some specific embodiments of the utility model have been described in detail through examples, those skilled in the art should understand that the above examples are only for illustration, and are not intended to limit the scope of the utility model; the above embodiments can be modified without departing from the scope and spirit of the utility model, and any technical solution formed by equivalent replacement or equivalent transformation belongs to the protection scope required by the utility model, and the scope of the utility model is defined by the appended claims.

Claims

1. A centrifugal electric water pump for an electric vehicle thermal management system, characterized in that, It includes: Back cover, magnetic ring limit D cavity, water pump motor controller, injection hole cavity, magnetic pole position identification boss, back cover gasket, motor shell, motor shell sealing ring, bus bar terminal, motor shell limit groove, stator core limit boss, water jacket positioning column one, fastening screw, stator core, stator core fixing screw, stator insert, centrifugal pump water jacket, water jacket positioning column two, motor rotor assembly, impeller anti-loosening screw, bearing one, bearing two, stator winding, motor shaft, magnetic ring support sleeve, magnetic ring, magnetic ring injection sleeve, centrifugal pump bearing seat, bearing seat countersunk hole, filter screen, centrifugal pump impeller, centrifugal pump shell, nut insert, impeller insert, pump shell sealing ring, shock pad assembly, power connector; The motor rotor assembly is provided with the magnetic ring support sleeve, the magnetic ring and the magnetic ring injection sleeve, the motor shaft is arranged as a regular hexahedron, two shaft shoulders for limiting the magnetic ring support sleeve are arranged on the motor shaft, a left-hand thread hole is arranged on the end face of the large end of the motor shaft, the small end of the motor shaft is interference-fitted with the bearing one, the magnetic ring support sleeve is designed as a D-shaped shape, the inner hole of the magnetic ring support sleeve is designed as a regular hexagonal cavity, six injection hole cavities are arranged on the magnetic ring support sleeve, the magnetic ring is provided with the magnetic ring limit D cavity and the magnetic pole position identification boss, the magnetic ring, the magnetic ring support sleeve and the motor shaft are injection-coupled and fixed through the injection hole cavities, the magnetic ring injection sleeve completely covers the magnetic ring support sleeve and the magnetic ring, and the magnetic ring is radially magnetized along the circumference through the magnetic pole position identification boss; The centrifugal pump bearing seat is provided with the bearing seat countersunk hole and a bearing chamber, the centrifugal pump impeller is provided with the impeller insert, the centrifugal pump water jacket is provided with the water jacket positioning column one, the water jacket positioning column two and the nut insert, a circular cavity is arranged at the center of the end face of the centrifugal pump water jacket, the bottom of the inner circular cavity of the centrifugal pump water jacket is provided with a bearing chamber for sliding assembly of the bearing one, and three small threaded holes are arranged on the end face of the outer cylinder at the bottom of the centrifugal pump water jacket. The centrifugal pump shell is provided with five screw through holes, and the end face of the centrifugal pump shell is provided with a circular annular groove, the pump shell sealing ring is installed in the circular annular groove, the end face of the centrifugal pump water jacket is provided with five screw through holes, the motor shell is provided with the motor shell limiting groove, the front end face of the motor shell is provided with an oval annular rectangular groove, the motor shell sealing ring is installed in the oval annular rectangular groove, the front end face of the motor shell is also provided with five threaded holes, the bottom of the motor shell is provided with four symmetrically distributed shock pad mounting holes, four shock pad assemblies are installed in the four shock pad mounting holes, the inner circular cavity of the motor shell is provided with two inclined cavities with the cavity center axis as the center, and each of the bottom planes of the two cavities is provided with a threaded hole, the stator core is provided with the stator core limiting boss, the stator core limiting boss is paired and positioned with the motor shell limiting groove, the outer cylindrical surface of the stator core is provided with two bosses symmetrically arranged with the outer cylindrical surface center axis as the center, and each of the two bosses is provided with a threaded hole.

2. A centrifugal electric water pump for a thermal management system of an electric vehicle according to claim 1, characterized in that, The four fastening screws, the nut inserts and the centrifugal pump bearing seat are tightly fixed on the end face of the centrifugal pump water jacket, so as to limit the axial displacement of the centrifugal pump bearing seat, and the bearing chamber of the centrifugal pump bearing seat is interference fitted with the bearing two.

3. A centrifugal electric water pump for thermal management system of electric vehicles according to claim 1, characterized in that, The number of magnetic poles of the magnetic ring is set to 2 pairs of poles or 3 pairs of poles, the number of teeth and slots of the stator core is set to 6 slots or 9 slots, and the stator winding adopts fractional slot concentrated winding design; one stator insert is inserted at each end of the stator core, the inside of the stator insert is wound with single-layer enameled copper wire, the diameter of the enameled copper wire is 0.90mm or 1.00mm, and the coils of the stator winding are connected by Δ (delta) connection.

4. A centrifugal electric water pump for thermal management system of electric vehicles according to claim 1, characterized in that, The bearing one is a dust-proof half-titanium deep groove ball bearing or a dust-proof engineering plastic deep groove ball bearing, and the bearing two is a dust-proof half-titanium deep groove ball bearing or a dust-proof engineering plastic deep groove ball bearing. Because of its self-lubricating characteristics, it is particularly suitable for long-term operation in cooling liquid.

5. A centrifugal electric water pump for thermal management system of electric vehicles as claimed in claim 1 wherein, The three-phase power terminal wires of the stator winding and the busbar terminal posts are welded and connected, the stator core and its components are assembled in the circular cavity of the motor shell through the alignment and pre-positioning of the stator core limiting boss and the motor shell limiting groove, and then the stator core and its components are fixed and connected with the motor shell by using two stator core fixing screws. The assembly joint surface between the stator core and the motor shell is coated with insulating heat-conducting silicone to improve the heat conduction and vibration resistance of the stator core and its components. The power connector and the installation contact surface of the motor shell are coated with sealing glue, and the power connector and the motor shell are tightly fixed by four screws. The terminal connecting wires of the power connector are also welded and fixed with the circuit board of the water pump motor controller. The rear cover and the motor shell are tightly fixed by using four screws, and the rear cover sealing gasket is pressed between the rear cover and the motor shell.

6. A centrifugal electric water pump for thermal management system of electric vehicles as claimed in claim 1 wherein, The larger impurities in the cooling liquid are filtered by the filter screen and flow into the circular cavity inside the water jacket of the centrifugal pump, while the air inside the circular cavity of the water jacket of the centrifugal pump is discharged, so that the bearing raceways of the bearing one and the bearing two are less likely to be blocked by the larger impurities, and the abnormal noise and wear of the bearings can be effectively reduced.

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