Electronic water pump and heat dissipation method

Abstract

Disclosed in the present invention are an electronic water pump and a heat dissipation method. A stator winding of the electronic water pump comprises an insulating support and a wound wire sealed in the insulating support, wherein a lead-out end of the wound wire extends out of the lower end of the insulating support and passes through a heat dissipation base and a PCBA in sequence; the lower portion of the insulating support is connected to the heat dissipation base in a sealing manner, and the heat dissipation base is connected to a housing in a sealing manner; a cooling liquid inlet is provided in a top plate of the housing; a cooling liquid channel which penetrates a top face and a bottom face of a rotating shaft is provided in the middle of the rotating shaft, and a top opening of the cooling liquid channel is located in a volute and forms a cooling liquid outlet; and a stator core, the insulating support and a rotor are completely immersed in a cooling liquid in an electric-motor cavity. Since no isolation sleeve is provided between the stator core and a rotor core, the electrical gap between the stator core and the rotor core is relatively small, and thus an electric motor of the electronic water pump has a relatively small size and a relatively light weight, the electric motor has a relatively high level of efficiency, and the electric motor and the PCBA have a good heat dissipation effect.

Description

Electronic water pump and heat dissipation method Technical Field

[0001] The present invention belongs to the technical field of electronic water pumps, and in particular relates to an electronic water pump and a heat dissipation method. Background Art

[0002] The electronic water pump in a car delivers coolant to the engine's cooling system, thereby cooling the engine. The electronic water pump comprises a volute, a housing, and a rear cover. A heat sink is secured within the housing. The interior cavity between the housing's top plate and the heat sink forms a motor cavity, housing a motor. The interior cavity between the heat sink and the rear cover forms a PCBA cavity, housing a PCBA circuit board that contacts the heat sink. The motor comprises a stator and a rotor. The stator includes a stator core and stator windings, while the rotor comprises a rotor core, permanent magnets, and a rotating shaft.

[0003] The stator core is fixedly connected to the casing, the bottom of the rotating shaft is rotatably connected to the heat dissipation base at the lower part of the casing, the upper part of the rotating shaft is rotatably connected to the top plate of the casing, the top end of the rotating shaft passes through the top plate of the casing and extends into the volute above the casing, the impeller in the volute is fixed on the rotating shaft, and an isolation sleeve is provided between the stator core and the rotor core in the motor cavity, so that the electrical gap between the stator core and the rotor core is larger. Under the same output power, the motor of the electronic water pump is larger in size, heavier in weight and relatively lower in efficiency. Moreover, due to the larger size of the motor, the volume of the electronic water pump assembly is relatively large.

[0004] In addition, since the PCBA circuit board is in contact with the heat sink base, when the PCBA circuit board is cooled, a small amount of coolant entering the volute from the liquid inlet on the volute enters the gap between the isolation sleeve and the rotor core and flows downward to the top surface of the heat sink base to cool the heat sink base and then cool the PCBA circuit board. However, due to the provision of the isolation sleeve, the contact area between the heat sink base and the coolant is small, which in turn affects the heat dissipation effect of the PCBA circuit board. In addition, the stator of the motor is not in direct contact with the coolant, which also affects the heat dissipation effect of the motor. Summary of the Invention

[0005] In view of the above-mentioned defects of the prior art, the present invention provides an electronic water pump and a heat dissipation method. Since no isolation sleeve is provided between the stator core and the rotor core, the electrical gap between the stator core and the rotor core is small, and thus the motor of the electronic water pump is small in size, light in weight and relatively efficient, and the heat dissipation effect of the motor and the PCBA circuit board is good.

[0006] The technical solution adopted by the present invention to solve its technical problem is:

[0007] An electronic water pump includes a volute, a housing, and a rear cover. A heat sink is fixed in the housing. The housing cavity between the top plate of the housing and the heat sink forms a motor cavity. A motor is provided in the motor cavity. The housing cavity between the heat sink and the rear cover forms a PCBA cavity. A PCBA circuit board is provided in the PCBA cavity and contacts the heat sink. The motor includes a stator and a rotor. The stator includes a stator core and a stator winding. The stator winding includes an insulating bracket and a winding sealed in the insulating bracket. The winding outlet is connected to the insulating bracket from below. The end extends out and passes through the heat dissipation base and the PCBA circuit board in sequence. The lower part of the insulating bracket is sealed with the heat dissipation base, so that the outlet end of the winding is completely isolated from the motor cavity. The heat dissipation base is sealed with the casing, so that the PCBA cavity is completely isolated from the motor cavity. A coolant inlet is provided on the top plate of the casing. A coolant channel is provided in the middle of the rotating shaft and passes through the top and bottom surfaces of the rotating shaft. The top opening of the coolant channel is in the volute and forms a coolant outlet. The stator core, insulating bracket and rotor are completely immersed in the coolant in the motor cavity.

[0008] Furthermore, the insulating support includes a plurality of insulating sub-supports, the winding includes a plurality of sub-windings whose number is equal to the number of insulating sub-supports, each of the insulating sub-supports and the corresponding sub-winding cooperate to form a stator sub-winding, each of the insulating sub-supports includes an inner insulating sub-support and an outer insulating sub-support, each of the sub-windings is wound in a winding groove of the corresponding inner insulating sub-support, the outer insulating sub-support is arranged on the outside of the inner insulating sub-support and seals the sub-winding in the winding groove, the heat dissipation base is provided with a plurality of sealing seats whose number is equal to the number of stator sub-windings, the sealing seat is provided with a through channel passing through the top and bottom surfaces of the sealing seat, the lower part of each outer insulating sub-support is passed through the corresponding through channel and is sealed with the through channel, and the outlet end of the sub-winding extends from the lower end of the outer insulating sub-support and passes through the PCBA circuit board.

[0009] Furthermore, the through channel is stepped, and the step surface inside the through channel divides the through channel into an upper through channel and a lower through channel. The lower part of the outer insulating sub-bracket is stepped, and the step surface of the through channel, the step surface of the lower part of the outer insulating sub-bracket and the side surface of the upper through channel form a sealing ring accommodating cavity, and the sealing ring accommodating cavity is provided with a first sealing ring mounted on the outer insulating sub-bracket.

[0010] Furthermore, the inner insulating sub-bracket and the outer insulating sub-bracket are both injection-molded, and the inner insulating sub-bracket and the outer insulating sub-bracket are integrally injection-molded and connected.

[0011] Furthermore, the stator core includes a stator inner ring core and a stator outer ring core. The stator inner ring core is provided with a plurality of pressing stations whose number is equal to the number of stator sub-windings. Each of the stator sub-windings is pressed at a corresponding pressing station, and the stator outer ring core is pressed on the outside of the plurality of stator sub-windings.

[0012] Furthermore, a second sealing ring is provided around the outer side surface of the heat dissipation base to seal the heat dissipation base to the housing, wherein the second sealing ring is provided in a sealing ring receiving groove on the outer side surface of the heat dissipation base.

[0013] Furthermore, the casing, volute and rear cover are all made of plastic, the heat dissipation base is made of aluminum alloy, the insulating bracket is made of PPS plastic, and the coolant entering the coolant inlet is antifreeze.

[0014] Furthermore, the heat dissipation base is fixedly connected to the casing by bolts; the rotating shaft is passed through and fixed in the middle through hole of the rotor core, the bottom of the rotating shaft is rotatably connected to the heat dissipation base through a first sliding bearing, the upper part of the rotating shaft is rotatably connected to the top plate of the casing through a second sliding bearing, the top end of the rotating shaft passes through the top plate of the casing and extends into the volute, and the impeller in the volute is fixed on the rotating shaft.

[0015] A heat dissipation method for an electronic water pump, specifically: the coolant entering the volute enters the motor cavity from the coolant inlet, flows downward to the top surface of the heat dissipation base, enters the coolant channel from the bottom end opening of the coolant channel, flows upward along the coolant channel, and is discharged into the volute from the coolant outlet, wherein the stator core, insulating bracket and rotor are completely immersed in the coolant in the motor cavity to achieve the purpose of heat dissipation of the motor, and the heat generated by the PCBA circuit board is transferred to the heat dissipation base, and the heat on the heat dissipation base is carried away by the coolant.

[0016] Furthermore, the rotor is completely immersed in the coolant in the motor cavity. Specifically, the rotor core, permanent magnet and rotating shaft of the rotor are completely immersed in the coolant in the motor cavity.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The stator winding of the electronic water pump in the present invention includes an insulating bracket and a winding sealed in the insulating bracket. The winding outlet extends from the lower end of the insulating bracket and passes through the heat sink base and the PCBA circuit board in sequence. The lower part of the insulating bracket is sealed with the heat sink base to completely isolate the winding outlet from the motor cavity. The heat sink base is sealed with the casing to completely isolate the PCBA cavity from the motor cavity. A coolant inlet is provided on the top plate of the casing. A coolant channel is provided in the middle of the rotating shaft of the electronic water pump, which passes through the top and bottom surfaces of the rotating shaft. The top opening of the coolant channel is located in the volute and forms a coolant outlet. The stator core, insulating bracket and rotor are completely immersed in the coolant in the motor cavity; since the winding is sealed in the insulating bracket, the winding wire end extends from the lower end of the insulating bracket and passes through the heat sink base and PCBA circuit board in turn. The lower part of the insulating bracket is sealed with the heat sink base, so that the winding wire end is completely isolated from the motor cavity. Therefore, the winding and the winding wire end will not come into contact with the coolant in the motor cavity, and there will be no risk of hydrolysis. Since the heat sink base is sealed with the casing, the PCBA cavity is completely isolated from the motor cavity, so the PCBA circuit board will not come into contact with the coolant in the motor cavity. Coolant in the machine cavity; Since there is no isolation sleeve between the stator core and the rotor core in the motor cavity, the electrical gap between the stator core and the rotor core is reduced from the original 2.5mm to 0.5mm. Under the same output power, the motor volume of the electronic water pump can be reduced by 10%, the motor weight can be reduced by 10%, the motor efficiency can be improved by 10%, and the motor cost can be reduced. Moreover, since the motor volume can be reduced, the volume and weight of the electronic water pump assembly can be reduced. Moreover, since there is no isolation sleeve, the cost of the electronic water pump assembly can be reduced. In addition, since the stator core and the rotor core are separated, the electrical gap between the stator core and the rotor core is reduced from the original 2.5mm to 0.5mm. No isolation sleeve is set between the cores, so that the coolant entering the motor cavity can flow downward to the entire top surface of the heat sink base, and the contact area between the heat sink base and the coolant is larger. Since the heat generated by the PCBA circuit board needs to be transferred to the heat sink base and carried away by the coolant flowing to the top surface of the heat sink base, the larger contact area between the heat sink base and the coolant can improve the heat dissipation effect of the PCBA circuit board. In addition, since the stator core, insulating bracket and rotor are completely immersed in the coolant in the motor cavity, the stator of the motor is in direct contact with the coolant, thereby improving the heat dissipation effect of the motor.

[0019] In the present invention, the casing, volute and rear cover are all made of plastic, the heat dissipation base is made of aluminum alloy, the insulating bracket is made of PPS plastic, and the coolant entering the coolant inlet is antifreeze. Since the motor and PCBA circuit board of the electronic water pump in the present invention have good heat dissipation effect, the casing, volute and rear cover of the electronic water pump can all be made of plastic, thereby reducing the weight and cost of the electronic water pump assembly and achieving a lightweight effect. Since the coolant is antifreeze, and antifreeze has anti-corrosion and anti-rust functions, the rotor and the stator core without a coating on the surface will not rust when immersed in the antifreeze. Since the insulating bracket is PPS plastic, there is no corrosion risk when the insulating bracket is immersed in the antifreeze. In addition, the heat dissipation base made of aluminum alloy is in direct contact with the antifreeze. The thermal conductivity of aluminum alloy is high, which can further improve the heat dissipation effect of the PCBA circuit board. Components on the PCBA circuit board can be selected with a low temperature resistance grade to reduce costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] FIG1 is a schematic perspective cross-sectional view of the electronic water pump of the present invention;

[0021] FIG2 is a partial enlarged structural schematic diagram of FIG1 ;

[0022] FIG3 is a schematic diagram of the three-dimensional structure of the inner insulating sub-bracket;

[0023] FIG4 is a schematic diagram of a three-dimensional structure in which a sub-winding is wound in a winding groove of an inner insulating sub-bracket;

[0024] FIG5 is a schematic diagram of a three-dimensional structure in which an outer insulating sub-bracket is arranged outside an inner insulating sub-bracket and a sub-winding is sealed in a winding groove;

[0025] FIG6 is a schematic diagram of a three-dimensional structure in which the first sealing ring is sleeved on the outer insulating bracket;

[0026] FIG7 is a schematic diagram of the three-dimensional structure of the stator inner ring core;

[0027] FIG8 is a schematic diagram of the three-dimensional structure of each stator sub-winding being press-fitted onto the corresponding press-fitting station of the stator inner ring core;

[0028] FIG9 is a schematic diagram of a three-dimensional structure in which the stator outer ring core is press-fitted onto the outer sides of a plurality of stator sub-windings;

[0029] FIG10 is a schematic diagram of the three-dimensional structure of a stator formed by press-assembling a stator core and a plurality of stator sub-windings.

[0030] Explanation of the reference numerals in the figure: 1. volute, 2. casing, 3. back cover, 4. heat dissipation base, 5. motor cavity, 6. PCBA cavity, 7. PCBA circuit board, 8. stator core, 801. stator inner ring core, 802. stator outer ring core, 9. stator sub-winding, 901. insulating sub-bracket, 9011. inner insulating sub-bracket, 9012. outer insulating sub-bracket, 902. sub-winding, 10. coolant inlet, 11. rotating shaft, 1101. coolant channel, 12. sealing seat, 1201. lower through channel, 13. sealing ring accommodating chamber, 14. first sealing ring, 15. second sealing ring, 16. sealing ring accommodating groove, 17. rotor core, 18. permanent magnet, 19. first sliding bearing, 20. second sliding bearing, 21. impeller. DETAILED DESCRIPTION

[0031] The following is a further detailed description of the specific embodiments of the present invention in conjunction with the accompanying drawings. These embodiments are only used to illustrate the present invention, and are not intended to limit the present invention.

[0032] In the description of the present invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0033] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0034] Furthermore, in the description of the present invention, unless otherwise specified, “plurality” means two or more.

[0035] As shown in Figure 1, an electronic water pump includes a volute 1, a casing 2 and a back cover 3. A heat sink 4 is fixed in the casing 2. The inner cavity of the casing 2 between the top plate of the casing 2 and the heat sink 4 forms a motor cavity 5. The motor is provided in the motor cavity 5. The inner cavity of the casing 2 between the heat sink 4 and the back cover 3 forms a PCBA cavity 6. The PCBA cavity 6 is provided with a PCBA circuit board 7 in contact with the heat sink 4. The motor includes a stator and a rotor. The stator includes a stator core 8 and a stator winding. The rotor includes a rotor core 17, a permanent magnet 18 and a rotating shaft 11. The stator core 8 is fixedly connected to the casing 2. The stator winding includes an insulating bracket and a sealing member sealed in the insulating bracket. The winding inside, the winding outlet extends from the lower end of the insulating bracket and passes through the heat dissipation base 4 and the PCBA circuit board 7 in sequence. The lower part of the insulating bracket is sealed with the heat dissipation base 4, so that the winding outlet is completely isolated from the motor cavity 5. The heat dissipation base 4 is sealed with the casing 2, so that the PCBA cavity 6 is completely isolated from the motor cavity 5. A coolant inlet 10 is provided on the top plate of the casing 2, and a coolant channel 1101 is provided in the middle of the rotating shaft 11, which runs through the top and bottom surfaces of the rotating shaft 11. The top opening of the coolant channel 1101 is in the volute 1 and forms a coolant outlet. The stator core 8, the insulating bracket and the rotor are completely immersed in the coolant in the motor cavity 5.

[0036] Since the winding is sealed in the insulating bracket, the winding wire end extends from the lower end of the insulating bracket and passes through the heat dissipation base 4 and the PCBA circuit board 7 in sequence. The lower part of the insulating bracket is sealed and connected to the heat dissipation base 4, so that the winding wire end is completely isolated from the motor cavity 5. Therefore, the winding and the winding wire end will not come into contact with the coolant in the motor cavity 5, and there is no risk of hydrolysis. Since the heat dissipation base 4 is sealed and connected to the casing 2, the PCBA cavity 6 is completely isolated from the motor cavity 5. Therefore, the PCBA circuit board 7 will not come into contact with the coolant in the motor cavity 5; since no isolation sleeve is provided between the stator core 8 and the rotor core 17 in the motor cavity 5, the electrical clearance between the stator core 8 and the rotor core 17 is reduced from the original 2.5mm to 0.5mm. Under the same output power, the motor volume of the electronic water pump can be reduced by 10%, the motor weight can be reduced by 10%, and the motor The efficiency can be improved by 10%, and the cost of the motor can be reduced. Moreover, since the volume of the motor can be reduced, the volume and weight of the electronic water pump assembly can be reduced. Moreover, since no isolation sleeve is provided, the cost of the electronic water pump assembly can be reduced. In addition, since no isolation sleeve is provided between the stator core 8 and the rotor core 17, the coolant entering the motor cavity 5 can flow downward to the entire top surface of the heat dissipation base 4, and thus the contact area between the heat dissipation base 4 and the coolant is larger. Since the heat generated by the PCBA circuit board 7 needs to be transferred to the heat dissipation base 4 and carried away by the coolant flowing to the top surface of the heat dissipation base 4, the larger contact area between the heat dissipation base 4 and the coolant can improve the heat dissipation effect of the PCBA circuit board 7. Moreover, since the stator core 8, the insulating bracket and the rotor are completely immersed in the coolant in the motor cavity 5, the stator of the motor is in direct contact with the coolant, thereby improving the heat dissipation effect of the motor.

[0037] In one embodiment,

[0038] The insulating bracket includes a plurality of insulating sub-brackets 901, and the winding includes a plurality of sub-windings 902 equal in number to the number of insulating sub-brackets 901, as shown in FIG1, each insulating sub-bracket 901 and the corresponding sub-winding 902 cooperate to form a stator sub-winding 9, as shown in FIG8-10, each insulating sub-bracket 901 includes an inner insulating sub-bracket 9011 and an outer insulating sub-bracket 9012, each sub-winding 902 is wound in the winding groove of the corresponding inner insulating sub-bracket 9011, and the outer insulating sub-bracket 9012 is arranged inside. The outer side of the insulating sub-bracket 9011 is provided, and the sub-winding 902 is sealed in the winding groove, see Figures 3-5. The heat dissipation base 4 is provided with a plurality of sealing seats 12, the number of which is equal to the number of the stator sub-windings 9. The sealing seat 12 is provided with a through channel that passes through the top and bottom surfaces of the sealing seat 12. The lower part of each outer insulating sub-bracket 9012 is passed through the corresponding through channel and is sealed with the through channel. The outlet end of the sub-winding 902 extends from the lower end of the outer insulating sub-bracket 9012 and passes through the PCBA circuit board 7, see Figure 1.

[0039] Preferably, the through-channel is stepped, with a stepped surface within the through-channel dividing it into an upper through-channel and a lower through-channel 1201. The lower portion of the outer insulating sub-support 9012 is stepped, and the stepped surface of the through-channel, the stepped surface of the lower portion of the outer insulating sub-support 9012, and the side surfaces of the upper through-channel form a sealing ring accommodating cavity 13 (see Figures 1 and 2). A first sealing ring 14 is positioned within the sealing ring accommodating cavity 13, which is sleeved onto the outer insulating sub-support 9012 (see Figure 6). The placement of each first sealing ring 14 prevents the outlet end of the corresponding sub-winding 902 from contacting the coolant within the motor cavity 5.

[0040] Preferably, the inner insulating sub-bracket 9011 and the outer insulating sub-bracket 9012 are both injection molded, and the inner insulating sub-bracket 9011 and the outer insulating sub-bracket 9012 are integrally injection-molded and connected. This allows each sub-winding 902, i.e., the enameled wire, to be sealed within the winding groove of the corresponding inner insulating sub-bracket 9011, thereby ensuring that the enameled wire does not contact the coolant in the motor cavity 5. The enameled wire is at risk of hydrolysis when immersed in the coolant. After hydrolysis, the paint coating on the enameled wire surface will dissolve, posing the risk of inter-turn short circuits, resulting in poor motor insulation and reduced insulation resistance. If the insulation resistance becomes too low, it will break down and spark, ultimately burning each stator sub-winding 9. Therefore, the enameled wire needs to be injection molded to ensure that it does not contact the coolant.

[0041] Preferably, as shown in Figures 7-10, the stator core 8 includes a stator inner core 801 and a stator outer core 802. The stator inner core 801 is provided with a plurality of press-fitting stations, the number of which is equal to the number of stator sub-windings 9. Each stator sub-winding 9 is press-fitted at a corresponding press-fitting station, and the stator outer core 802 is press-fitted outside the plurality of stator sub-windings 9. In this way, the stator inner core 801 and the stator outer core 802 cooperate to secure each stator sub-winding 9.

[0042] In one embodiment, as shown in Figures 1 and 2 , a second sealing ring 15 is provided around the outer surface of the heat sink base 4, sealingly connecting the heat sink base 4 to the housing 2. The second sealing ring 15 is disposed within a sealing ring receiving groove 16 on the outer surface of the heat sink base 4. The provision of the second sealing ring 15 completely isolates the PCBA cavity 6 from the motor cavity 5, thereby preventing the PCBA circuit board 7 from coming into contact with the coolant in the motor cavity 5.

[0043] In one embodiment,

[0044] The casing 2 , the volute 1 and the rear cover 3 are all made of plastic, the heat dissipation base 4 is made of aluminum alloy, the insulating bracket is made of PPS plastic, and the coolant entering the coolant inlet 10 is antifreeze. Since the motor and PCBA circuit board 7 of the electronic water pump in the present invention have good heat dissipation effect, the material of the casing 2, volute 1 and rear cover 3 of the electronic water pump can all be plastic, which can reduce the weight and cost of the electronic water pump assembly and play a role in lightweighting. Since the coolant is antifreeze, and the antifreeze has anti-corrosion and anti-rust functions, the rotor and the stator core 8 without a coating on the surface will not rust when immersed in the antifreeze. Since the insulating bracket is PPS plastic, where PPS plastic is polyphenylene sulfide, there is no risk of corrosion when the insulating bracket is immersed in the antifreeze. The antifreeze also has the characteristics of low freezing point and high boiling point, and the antifreeze does not produce scale. In addition, the heat dissipation base 4 made of aluminum alloy is in direct contact with the antifreeze. The thermal conductivity of aluminum alloy is high, which can further improve the heat dissipation effect of the PCBA circuit board 7. Therefore, the components on the PCBA circuit board 7 can select components with low temperature resistance to reduce costs.

[0045] Preferably, the heat sink base 4 is fixedly connected to the housing 2 via bolts. As shown in FIG1 , the rotating shaft 11 is inserted and fixed in the central through-hole of the rotor core 17. The bottom of the rotating shaft 11 is rotatably connected to the heat sink base 4 via a first sliding bearing 19, and the upper portion of the rotating shaft 11 is rotatably connected to the top plate of the housing 2 via a second sliding bearing 20. The top of the rotating shaft 11 passes through the top plate of the housing 2 and extends into the volute 1. The impeller 21 in the volute 1 is fixed to the rotating shaft 11. The surface of the rotor core 17 is not coated, while the surface of the permanent magnet 18 is coated. The rotor core 17 and the permanent magnet 18 will not rust when immersed in antifreeze.

[0046] A heat dissipation method for an electronic water pump, specifically: the coolant entering the volute 1 enters the motor cavity 5 from the coolant inlet 10, flows downward to the top surface of the heat dissipation base 4, enters the coolant channel 1101 from the bottom end opening of the coolant channel 1101, flows upward along the coolant channel 1101, and is discharged into the volute 1 from the coolant outlet, wherein the stator core 8, insulating bracket, rotor core 17, permanent magnet 18 and rotating shaft 11 are completely immersed in the coolant in the motor cavity 5, achieving the purpose of heat dissipation of the motor, and the heat generated by the PCBA circuit board 7 is transferred to the heat dissipation base 4, and the heat on the heat dissipation base 4 is carried away by the coolant.

[0047] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. An electronic water pump, characterized in that: The stator winding of the electronic water pump comprises an insulating bracket and a winding sealed in the insulating bracket, wherein the winding wire end extends from the lower end of the insulating bracket and passes through the heat dissipation base (4) and the PCBA circuit board (7) in sequence, the lower part of the insulating bracket is sealedly connected to the heat dissipation base (4), so that the winding wire end is completely isolated from the motor cavity (5), the heat dissipation base (4) is sealedly connected to the housing (2), so that the PCBA cavity (6) is completely isolated from the motor cavity (5), a coolant inlet (10) is provided on the top plate of the housing (2), a coolant channel (1101) is provided in the middle of the rotating shaft (11) of the electronic water pump, which passes through the top and bottom surfaces of the rotating shaft (11), the top opening of the coolant channel (1101) is located in the volute (1) and forms a coolant outlet, and the stator core (8), the insulating bracket and the rotor are completely immersed in the coolant in the motor cavity (5).

2. The electronic water pump according to claim 1, characterized in that: The insulating support comprises a plurality of insulating sub-supports (901), the winding comprises a plurality of sub-windings (902) whose number is equal to the number of insulating sub-supports (901), each insulating sub-support (901) and the corresponding sub-winding (902) cooperate to form a stator sub-winding (9), each insulating sub-support (901) comprises an inner insulating sub-support (9011) and an outer insulating sub-support (9012), each sub-winding (902) is wound in a winding groove of a corresponding inner insulating sub-support (9011), and the outer insulating sub-support (9012) is arranged The outer side of the inner insulating sub-bracket (9011) is provided, and the sub-winding (902) is sealed in the winding groove. The heat dissipation base (4) is provided with a plurality of sealing seats (12) whose number is equal to the number of the stator sub-windings (9). The sealing seats (12) are provided with through-channels penetrating the top and bottom surfaces of the sealing seats (12). The lower part of each outer insulating sub-bracket (9012) is passed through the corresponding through-channel and is sealedly connected to the through-channel. The outlet end of the sub-winding (902) extends from the lower end of the outer insulating sub-bracket (9012) and passes through the PCBA circuit board (7).

3. The electronic water pump according to claim 2, characterized in that: The through-channel is in a step-shaped manner, and the step surface in the through-channel divides the through-channel into an upper through-channel and a lower through-channel (1201). The lower portion of the outer insulating sub-bracket (9012) is in a step-shaped manner. The step surface of the through-channel, the step surface of the lower portion of the outer insulating sub-bracket (9012), and the side surface of the upper through-channel form a sealing ring accommodating cavity (13). A first sealing ring (14) sleeved on the outer insulating sub-bracket (9012) is provided in the sealing ring accommodating cavity (13).

4. The electronic water pump according to claim 2, characterized in that: The inner insulating sub-bracket (9011) and the outer insulating sub-bracket (9012) are both injection-molded, and the inner insulating sub-bracket (9011) and the outer insulating sub-bracket (9012) are integrally injection-molded and connected.

5. The electronic water pump according to claim 2, characterized in that: The stator core (8) comprises a stator inner ring core (801) and a stator outer ring core (802). The stator inner ring core (801) is provided with a plurality of press-fitting stations, the number of which is equal to the number of stator sub-windings (9). Each stator sub-winding (9) is press-fitted at a corresponding press-fitting station, and the stator outer ring core (802) is press-fitted on the outside of the plurality of stator sub-windings (9).

6. The electronic water pump according to claim 1, characterized in that: A second sealing ring (15) is sleeved around the outer side of the heat dissipation base (4), so that the heat dissipation base (4) is sealed to the housing (2), wherein the second sealing ring (15) is arranged in a sealing ring receiving groove (16) on the outer side of the heat dissipation base (4).

7. The electronic water pump according to claim 1, characterized in that: The casing (2), volute (1) and rear cover (3) are all made of plastic, the heat dissipation base (4) is made of aluminum alloy, the insulating bracket is made of PPS plastic, and the coolant entering the coolant inlet (10) is antifreeze.

8. The electronic water pump according to claim 7, characterized in that: The heat dissipation base (4) is fixedly connected to the casing (2) by bolts; the rotating shaft (11) is passed through and fixed in the middle through hole of the rotor core (17); the bottom of the rotating shaft (11) is rotationally connected to the heat dissipation base (4) via a first sliding bearing (19); the upper part of the rotating shaft (11) is rotationally connected to the top plate of the casing (2) via a second sliding bearing (20); the top end of the rotating shaft (11) passes through the top plate of the casing (2) and extends into the volute (1); the impeller (21) in the volute (1) is fixed on the rotating shaft (11).

9. A heat dissipation method for an electronic water pump according to any one of claims 1 to 8, characterized in that: Specifically, the coolant entering the volute (1) enters the motor cavity (5) from the coolant inlet (10), flows downward to the top surface of the heat dissipation base (4), enters the coolant channel (1101) from the bottom opening of the coolant channel (1101), flows upward along the coolant channel (1101), and is discharged from the coolant outlet to the volute (1), wherein the stator core (8), the insulating bracket and the rotor are completely immersed in the coolant in the motor cavity (5), thereby achieving the purpose of heat dissipation of the motor, and the heat generated by the PCBA circuit board (7) is transferred to the heat dissipation base (4), and the heat on the heat dissipation base (4) is taken away by the coolant.

10. The heat dissipation method of an electronic water pump according to claim 9, characterized in that: The rotor is completely immersed in the coolant in the motor cavity (5), specifically, the rotor core (17), the permanent magnet (18) and the rotating shaft (11) of the rotor are completely immersed in the coolant in the motor cavity (5).

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