CN111156175A

CN111156175A - Internal cooling system of electric water pump

Info

Publication number: CN111156175A
Application number: CN202010046940.XA
Authority: CN
Inventors: 韦修厦
Original assignee: Guangdong Junchi Technology Holding Co ltd
Current assignee: Guangdong Junchi Technology Holding Co ltd
Priority date: 2020-01-16
Filing date: 2020-01-16
Publication date: 2020-05-15

Abstract

The invention relates to an internal cooling system of an electric water pump, which comprises a rear cover, a rear cover sealing ring, a water pump controller, a coil electric terminal, a stator coil sheath, a coil, a motor stator, a motor shell, an inner cover big-end sealing ring, a water pump volute sealing ring, an inner cover, a water pump volute, a water pump impeller, a motor rotor shaft, an axial thrust wheel, a rotor front bearing damping ring, a bearing seat, a motor rotor, an inner cover small-end sealing ring, a rotor rear bearing damping ring, a rotor rear bearing, an axial flow type pilot impeller, a breather support, a breathable film, a breather sealing ring and an elastic cylindrical pin. According to the invention, through the cooperation of the internal water cooling system, the structure for improving coil heat dissipation on the motor stator and the breathing cooling of the breathing system for breathing out hot air in the inner cavity and sucking in external cold air, the heat load of the electric water pump is inhibited, the heat dissipation efficiency is greatly enhanced, and the high reliability of the operation of the electric water pump is improved.

Description

Internal cooling system of electric water pump

Technical Field

The invention relates to an electric water pump cooling system, in particular to an electric water pump cooling system applied to an automobile cooling system.

Background

Along with the development of electric automobiles, power components such as a driving motor and a power battery of the electric automobile need to be cooled by a cooling system to ensure the working performance and the working reliability of the power components, the cooling system of the electric automobile does not have a mechanical water pump driven by a traditional fuel automobile engine, only an electric water pump driven by electric power can be used, a motor controller for the motor and the driving motor to work can generate heat in the working process, overheating caused by rotor magnetic eddy current can cause demagnetization of a rotor permanent magnet, overheating of a stator can cause insulation burning of a coil, overheating of a controller can cause burning of devices of the controller, the existing electric water pump adopts a cooling mode that a small amount of water is led into the electric water pump from a high-pressure water cavity of the water pump, then internal cooling water flows out from a water pump impeller water suction port, and thus certain flow loss, lift loss and electric energy loss can be caused, because of the flow loss, the lift loss and the electric energy loss, the internal cooling can not be carried out by using large-flow water, so that the internal cooling effect of the electric water pump is poor; on the other hand, in the process of the electric water pump from the stop state to the working state, air in the inner cavity of the electric water pump is heated to generate thermal expansion, so that extra thermal load is generated, and the reliability of the electric water pump is influenced.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides the internal cooling system of the electric water pump, which inhibits the heat load of the electric water pump, greatly enhances the heat dissipation efficiency and improves the high running reliability of the electric water pump through the matching of the internal water cooling system, the structure for improving the heat dissipation of the coil on the motor stator and the breathing cooling of the breathing system for breathing the hot air in the inner cavity and sucking the external cold air.

The invention adopts the following technical scheme: an internal cooling system of an electric water pump comprises a motor shell, a water pump controller is installed in a counter bore at the rear end of the motor shell, a rear cover is installed at a hole opening at the rear end of the motor shell, a mounting hole of a respirator is arranged on the rear cover, an air duct and an air vent communicated with the inside and the outside of the rear cover are arranged at the bottom of the mounting hole of the respirator on the rear cover, a notch is arranged on the hole wall at one side of the mounting hole of the respirator on the rear cover, a ventilating window is arranged on a respirator support, a flange is arranged on the outer edge of the end face of the respirator support, the ventilating film is fixed on the bottom face of the respirator support, a respirator sealing ring is arranged on the outer circle of the respirator support between the outer circle of the respirator support and the mounting hole of the rear cover, the respirator support, the ventilating film and the, the ventilation window on the respirator bracket is aligned with the ventilation channel at the bottom of the mounting hole of the back cover respirator; the motor stator is arranged in a cavity of the motor shell, a stator coil sheath is arranged on the motor stator, a coil is arranged in a hollow groove of the stator coil sheath, a plurality of coil electric connection terminals are arranged on the stator coil sheath, the coil electric connection terminals are connected to a water pump controller arranged in a counter bore at the rear end of the motor shell, the head of the coil electric connection terminal in the same direction as the respirator is abutted against the end face of the respirator support, and the water pump volute is fastened on the motor shell; the inner cover passes through a shaft center hole of a motor stator and is installed in an inner cavity of a motor shell, a spiral overflowing hole and a bearing installation hole are formed in the small end of the rear end of the inner cover, a rear bearing of a rotor is installed in the bearing installation hole in the rear end of the inner cover, a plurality of overflowing grooves are formed in the inner hole wall of the inner cover, a bearing seat is installed in a hole in the front end of the inner cover, and the spiral overflowing hole is formed in the bearing seat; the motor rotor is arranged in a hole cavity of the inner cover, the axis of the motor rotor is provided with an axis through hole which penetrates through the front end face and the rear end face of the motor rotor, the motor rotor shaft is arranged in the axis through hole of the motor rotor, and the rear end of the motor rotor shaft penetrates through the bearing hole of the rotor rear bearing; the excircle of the rear end head part of the motor rotor shaft is provided with an axial flow type pilot impeller, the front end of the motor rotor shaft penetrates through a bearing hole of a rotor front bearing, the excircle of the front end head part of the motor rotor shaft is provided with a water pump impeller, and an axial thrust wheel is arranged between the rear end surface of an axis lug of the water pump impeller and the front end surface of the rotor front bearing; the rear end face of the axial thrust wheel is provided with a plurality of water throwing grooves which are wide near the axle center part and gradually narrow near the excircle part, the water throwing grooves at the rear end of the axial thrust wheel are communicated with the overflowing grooves of the front bearing of the rotor, the outer surface of the motor rotor is provided with a plastic coating wrapping the rotor, and the inside of the motor rotor is provided with a plurality of overflowing holes which penetrate through the inside and are communicated with the front end face and the rear end face of the motor rotor; the plastic-coated excircle of the motor rotor is provided with a plurality of spiral grooves, the front end hole wall of the shaft center hole of the motor rotor shaft is provided with a front spiral groove, the rear end hole wall of the shaft center hole of the motor rotor shaft is provided with a rear spiral groove, and the part of the motor rotor shaft, which is close to the front end surface and the rear end surface of the motor rotor, is provided with a plurality of radial through holes communicated with the shaft center hole of the motor rotor shaft.

Preferably, a plurality of pairs of wire clamping terminals and a plurality of wire buckling lugs are arranged on the end face of the stator coil sheath, each wire buckling lug on the end face of the stator coil sheath is provided with a wire buckling groove, a gap between each pair of wire clamping terminals on the end face of the stator coil sheath forms a wire clamping groove, each pair of wire clamping terminals on the end face of the stator coil sheath is connected to the corresponding coil electric connection terminal through a copper bar embedded in the stator coil sheath, a middle tap between each coil is a connection tap in a non-broken state, and a middle tap winding between the coils is buckled into the wire buckling grooves on the end face of the stator coil sheath and the wire clamping grooves between the wire clamping terminals.

Preferably, an inner cover small-head sealing ring is arranged between a small head at the rear end of the inner cover and an inner cavity boss at the rear end of the motor shell, an inner cover large-head sealing ring is arranged between a large head at the front end of the inner cover and an orifice of the motor shell, and a water pump volute sealing ring is arranged between the water pump volute and the front end head of the inner cover.

Preferably, a rotor rear bearing damping ring is arranged between the rotor rear bearing and a bearing mounting hole at the rear end of the inner cover, and a front end orifice of the inner cover is in a conical structure with a large orifice diameter and a small diameter toward the orifice.

Preferably, a plurality of semicircular grooves are formed in the hole wall of the front end hole of the inner cover, a plurality of semicircular grooves are formed in the excircle of the bearing seat, the excircle of the bearing seat is of a conical structure with a large front end diameter and a small rear end diameter, and the bearing seat is installed in the front end hole of the inner cover.

Preferably, the semicircular groove of the bearing seat is aligned with the semicircular groove of the inner cover to form a pin mounting hole, the semicircular groove of the bearing seat and the semicircular groove of the inner cover are arranged in the pin mounting hole, and the elastic cylindrical pin tightly supports the bearing seat in the front end hole of the inner cover.

Preferably, a rotor front bearing damping ring is arranged between the rotor front bearing and the bearing mounting hole on the bearing block, a flange is arranged on the end face of the rotor front bearing, and the front end of the rotor front bearing damping ring is propped against the rear end face of the end face flange of the rotor front bearing.

Preferably, the water pump impeller is provided with a main pump water impeller and an auxiliary pump water impeller, the main pump water impeller and the auxiliary pump water impeller form a whole, the main pump water impeller pumps water flow from a water inlet of the water pump volute to a water outlet of the water pump volute, and the auxiliary pump water impeller pumps water flow from the water inlet of the water pump volute to the water outlet of the water pump volute after passing through the internal cooling flow channel.

Preferably, the rear end of the water pump impeller shaft core lug is provided with a tooth-shaped boss, the front end surface of the axial thrust wheel is provided with a tooth-shaped concave pit, and the tooth-shaped boss at the rear end of the water pump impeller shaft core lug is buckled in the tooth-shaped concave pit at the front end of the axial thrust wheel.

Preferably, the plastic coating of the motor rotor is embedded in a radial through hole of the motor rotor shaft.

The directions of "front" and "rear" in this specification mean that the side closer to the water pump volute is front, and the side closer to the water pump controller cover is rear, and the same applies below.

The internal cooling system of the electric water pump has the advantages that: in the internal cooling system of the electric water pump, a breather support, a ventilated membrane, a breather sealing ring and a back cover air duct form a respiratory system of the electric water pump, an axle center through hole of a motor rotor shaft, a front spiral groove and a back spiral groove in the axle center through hole of the motor rotor shaft, a boss inner cavity in the middle of the back end of an inner cavity of a motor shell, an axial flow type guide impeller, an overflow groove of a back bearing of a rotor, an overflow hole in the back end of an inner cover, an overflow groove of an inner cover inner cavity, an overflow gap between the inner cover and the excircle of the motor rotor, an overflow hole and a spiral groove on the motor rotor, an overflow hole on a bearing seat, an overflow groove of a front bearing of the rotor, a water throwing groove on the back end surface of an axial thrust wheel and a water pump impeller form an internal water cooling system of the electric water pump, the internal water cooling system of the electric, through the cooperation between the respiratory cooling that improves the radiating structure of coil and respiratory system exhalation inner chamber hot-air and inhale outside cold air on inside water cooling system, the motor stator, restrained electric water pump's heat load to the radiating efficiency has been strengthened greatly, electric water pump moving high reliability is improved.

Drawings

FIG. 1 is a sectional view of an electric water pump according to the present invention;

FIG. 2 is an installed view of the bearing housing and inner cover of the present invention;

FIG. 3 is a perspective view of the inner cover of the present invention;

FIG. 4 is a perspective view of the bearing housing of the present invention;

FIG. 5 is a perspective view of the water pump impeller of the present invention;

FIG. 6 is a front view of the axial thrust wheel of the present invention;

FIG. 7 is a rear view of the axial thrust wheel of the present invention;

FIG. 8 is a perspective view of the rotor of the motor of the present invention;

FIG. 9 is a perspective view of the stator of the motor of the present invention;

FIG. 10 is a rear cover view of the three-dimensional structure of the present invention;

FIG. 11 is a perspective view of a respirator mount of the present invention;

fig. 12 is a perspective view of the bearing of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by a person skilled in the art without making any inventive step are within the scope of the present invention.

Example (b): an electric centrifugal pump.

Referring to fig. 1 to 12, an internal cooling system of an electric water pump includes a rear cover 1, a rear cover sealing ring 2, a water pump controller 3, a coil electric terminal 4, a stator coil sheath 5, a coil 6, a motor stator 7, a motor housing 8, an inner housing large-head sealing ring 9, a water pump scroll sealing ring 10, an inner housing 11, a water pump scroll 12, a water pump impeller 13, a motor rotor shaft 14, an axial thrust wheel 15, a rotor front bearing 16, a rotor front bearing damping ring 17, a bearing seat 18, a motor rotor 19, an inner housing small-head sealing ring 20, a rotor rear bearing damping ring 21, a rotor rear bearing 22, an axial flow type pilot impeller 23, a breather support 24, a breathable film 25, a breather sealing ring 26, and an elastic cylindrical pin 27;

the water pump controller 3 is arranged in a counter bore at the rear end of the motor shell 8, the rear cover 1 is arranged at an orifice at the rear end of the motor shell 8, a rear cover sealing ring 2 is arranged between the rear cover 1 and the orifice at the rear end of the motor shell 8, the rear cover 1 is provided with a mounting hole 1-1 of a respirator, the bottom of the respirator mounting hole 1-1 on the rear cover 1 is provided with an air duct 1-3 and an air vent 1-2 communicated with the inside and the outside of the rear cover, the hole wall of one side of the respirator mounting hole 1-1 on the rear cover 1 is provided with a notch 1-4, the respirator support 24 is provided with an air vent window 24-1, the outer edge of the end face of the respirator support 24 is provided with a flange 24-2, an air vent film 25 is fixed on the bottom face of the respirator support 24, the outer circle of the, a respirator bracket 24, a breathable film 25 and a respirator sealing ring 26 are arranged in a respirator mounting hole 1-1 on the rear cover 1, an end face flange 24-2 of the respirator bracket 24 is buckled into a hole wall gap 1-4 of the respirator mounting hole 1-1 on the rear cover 1 to restrain the rotational freedom degree of a respirator in the mounting hole, and a breathable window 24-1 on the respirator bracket 24 is aligned with a ventilation channel 1-3 at the bottom of the respirator mounting hole 1-1 of the rear cover to form a smooth respiratory airflow channel;

the air permeable membrane 25 is a membrane which can prevent liquid and solid from passing through and can allow gas to permeate, the air in the inner cavity of the electric water pump generates a thermal expansion effect due to the heating of the temperature rise of the electric water pump in the process that the electric water pump is in a stop state to a working state, the air in the inner cavity of the electric water pump is heated by the thermal expansion of the air in the inner cavity of the electric water pump to enable the air pressure in the inner cavity to be higher than the external atmospheric pressure of the electric water pump, the hot air thermally expanded in the inner cavity of the electric water pump is exhausted to the outside of the electric water pump from the ventilating window 26-1 on the respirator bracket 24 through the air permeable membrane 25, the air passage 1-3 on the rear cover and the air holes 1-2 communicated with the inside and the outside of the rear cover under the action of the internal and external pressure difference until the internal and external air pressures of the electric water pump are balanced, the hot air thermally expanded in the The cooling contraction effect is generated, the air pressure of the inner cavity of the electric water pump is lower than the external atmospheric pressure of the electric water pump due to the cooling contraction effect of the air in the inner cavity of the electric water pump, the cold air outside the electric water pump enters the inner cavity of the electric water pump from the vent holes 1-2 and the air ducts 1-3 on the rear cover through the breathable film 25 and the breathable window 24-1 on the respirator support 24 under the action of the internal and external pressure difference of the electric water pump until the internal and external air pressures of the electric water pump are balanced, the external cold air enters the inner cavity of the electric water pump through the respirator channel to generate the cooling effect on the inner cavity and inhibit the pressure difference stress caused by the cooling contraction of the air in the inner cavity, and the respirator support 24;

the motor stator 7 is arranged in the cavity of the motor shell 8, the motor stator 7 is provided with a stator coil sheath 5, a coil 6 is arranged in a hollow groove of the stator coil sheath 5, the stator coil sheath 5 is provided with a plurality of coil electric connection terminals 4, the coil electric connection terminals 4 are connected to the water pump controller 3 arranged in a counter bore at the rear end of the motor shell 8, and the head of the coil electric connection terminal 4 which is in the same direction with the respirator is abutted against the end face of the respirator support 24 to restrain the axial displacement of the respirator;

the end face of the stator coil sheath 5 is provided with a plurality of pairs of wire clamping terminals 5-1 and a plurality of wire buckling lugs 5-2, each wire buckling lug 5-2 on the end face of the stator coil sheath 5 is provided with a wire buckling groove 5-3, a gap between each pair of wire clamping terminals 5-1 on the end face of the stator coil sheath 5 forms a wire clamping groove, each pair of wire clamping terminals 5-1 on the end face of the stator coil sheath 5 is connected to a corresponding coil electric connection terminal 4 through a copper bar embedded in the stator coil sheath 5, a middle tap between each coil is a connecting tap in a non-broken state, a middle tap winding between the coils is buckled into the wire clamping groove between the wire buckling groove 5-3 and the wire clamping terminal 5-1 on the end face of the stator coil sheath 5, and the coil winding is always in a tensioned state in the coil winding process to realize the tight contact between the coil turns and the tight contact between the coil 6 and the stator coil sheath 5, the heat load of the coil 6 is well radiated to the motor shell 8 and the internal water cooling system through the stator coil sheath 5 and the motor stator 7, so that the working reliability of the coil is improved;

the inner cover 11 passes through an axial hole of the motor stator 7 and is installed in an inner cavity of the motor shell 8, an inner cover small-head sealing ring 20 is arranged between a small head at the rear end of the inner cover 11 and an inner cavity boss at the rear end of the motor shell 8, an inner cover large-head sealing ring 9 is arranged between a large head at the front end of the inner cover 11 and an orifice of the motor shell 8, the water pump volute 12 is fastened on the motor shell 8 through bolts, a water pump volute sealing ring 10 is arranged between the water pump volute 12 and the front end part of the inner cover 11, a spiral overflowing hole 11-3 and a bearing installation hole 11-4 are arranged inside the small head at the rear end of the inner cover 11, and the internal cooling water flows in a coherent flow state in the process of flowing through the spiral overflowing hole 11-3 at the rear end of the inner cover 11 so as to inhibit the flow resistance of the internal cooling water in the process of flowing through the overflowing hole 11-;

the rear rotor bearing 22 is arranged in a bearing mounting hole 11-4 at the rear end of the inner cover 11, a rear rotor bearing damping ring 21 is arranged between the rear rotor bearing 22 and the bearing mounting hole 11-4 at the rear end of the inner cover 11, the front end orifice of the inner cover 11 is in a conical structure with a large orifice diameter and a reduced diameter toward the inside of the orifice, and the inner hole wall of the inner cover 11 is provided with a plurality of overflow grooves 11-2;

the hole wall of the front end orifice of the inner cover 11 is provided with a plurality of semicircular grooves 11-1, the excircle of the bearing seat 18 is provided with a plurality of semicircular grooves 18-1, the excircle of the bearing seat 18 is in a conical structure with a large front end diameter and a small rear end diameter, the bearing seat 18 is arranged in the front end orifice of the inner cover 11, the semicircular grooves 18-1 of the bearing seat 18 are aligned with the semicircular grooves 11-1 of the inner cover 11 to form a pin mounting hole, the elastic cylindrical pin 27 is arranged in the pin mounting hole formed by the semicircular grooves 18-1 of the bearing seat 18 and the semicircular grooves 11-1 of the inner cover 11, the elastic cylindrical pin 27 tightly supports the bearing seat 18 in the front end orifice of the inner cover 11 and restrains the rotation freedom degree of the bearing seat 18 in the front end orifice of the inner cover 11, the bearing seat 18 is provided with spiral flow passing holes 18-2, and the internal cooling water flows in a flowing state in the process of flowing through the spiral flow passing holes 18-2 on the bearing seat 18 to restrain Resistance to flow during flow through the spiral flow holes 18-2 in the bearing housing 18;

a bearing mounting hole 18-3 is arranged on a bearing seat 18, a rotor front bearing 16 is arranged in the bearing mounting hole 18-3 on the bearing seat 18, a rotor front bearing damping ring 17 is arranged between the rotor front bearing 16 and the bearing mounting hole 18-3 on the bearing seat 18, a flange 16-1 is arranged on the end surface of the rotor front bearing 16, the front end of the rotor front bearing damping ring 17 is propped against the rear end surface of the end surface flange 16-1 of the rotor front bearing 16, a flow passing groove 16-2 which runs through the front and rear end surfaces of the bearing is arranged in the bearing hole of the rotor front bearing 16, a motor rotor 19 is arranged in the hole cavity of an inner cover 11, the shaft center of the motor rotor 19 is provided with a shaft center through hole which runs through the front and rear end surfaces of the motor rotor 19, the motor rotor shaft 14 is arranged in the shaft center hole of the motor rotor 19, and the rear end of the motor rotor shaft 14 passes through the bearing hole of the;

an axial flow type guide impeller 23 is arranged on the excircle of the rear end head part of the motor rotor shaft 14, the axial flow type guide impeller 23 is fixed on the excircle of the rear end part of the motor rotor shaft 14 in a tight fit manner, the front end of the motor rotor shaft 14 penetrates through a bearing hole of the rotor front bearing 16 and takes the bearing hole of the rotor front bearing 16 as the radial support of the front part of the rotor, a water pump impeller 13 is arranged on the excircle of the front end head part of the motor rotor shaft 14, the water pump impeller 13 is fixed on the excircle of the front end part of the motor rotor shaft 14 in a tight fit manner, a main pump water impeller 13-1 and an auxiliary pump water impeller 13-2 are arranged on the water pump impeller 13, the main pump water impeller 13-1 and the auxiliary pump water impeller 13-2 are made into a whole, the main pump water impeller 13-1 directly pumps most of water from the water inlet of the water pump volute 12 to the water outlet of the water pump volute 12, and the auxiliary pump water impeller 13- Then pumping to the water outlet of the water pump volute 12;

an axial thrust wheel 15 is arranged between the rear end face of an axle center lug of a water pump impeller 13 and the front end face of a rotor front bearing 16, a tooth-shaped boss 13-3 is arranged at the rear end of the axle center lug of the water pump impeller 13, a tooth-shaped pit 15-1 is arranged on the front end face of the axial thrust wheel 15, the tooth-shaped boss 13-3 at the rear end of the axle center lug of the water pump impeller 13 is buckled in the tooth-shaped pit 15-1 at the front end of the axial thrust wheel 15, the water pump impeller 13 drives the axial thrust wheel 15 to synchronously rotate along with the water pump impeller 13, a plurality of water throwing grooves 15-2 which are gradually narrowed by the width of the axle center part and the outer circle part are arranged on the rear end face of the axial thrust wheel 15, the water throwing grooves 15-2 at the rear end of the axial thrust wheel 15 are communicated with an overflowing groove 16-2 of the rotor front bearing 16, an outer surface of a motor rotor 19 is provided with a wrapping, a plurality of overflowing holes 19-2 which penetrate through the motor rotor 19 and are communicated with the front end face and the rear end face of the motor rotor 19 are formed in the motor rotor 19;

the outer circle of a plastic-coated 19-1 of the motor rotor 19 is provided with a plurality of spiral grooves 19-3, the axis of the motor rotor shaft 14 is provided with an axis through hole penetrating through the front end face and the rear end face of the motor rotor shaft 14, the front end hole wall of the axis hole of the motor rotor shaft 14 is provided with a front spiral groove 14-1, the rear end hole wall of the axis hole of the motor rotor shaft 14 is provided with a rear spiral groove 14-3, the part of the motor rotor shaft 14, close to the front end face and the rear end face of the motor rotor 19, is provided with a plurality of radial through holes 14-2 communicating with the axis hole of the motor rotor shaft 14, and the plastic-coated 19-1 of the motor rotor 19 is embedded into the radial through hole 14.

In this embodiment, the plastic-coated 19-1 of the motor rotor 19 is embedded in the radial through hole 14-2 of the motor rotor shaft 14 to restrict the relative motion freedom of the motor rotor 19 and the motor rotor shaft 14, the motor rotor 19 drives the motor rotor shaft 14 and the water pump impeller 13 and the axial flow type pilot impeller 23 mounted on the motor rotor shaft 14 to synchronously run with the motor rotor 19, the axial hole of the motor rotor shaft 14, the front spiral groove 14-1 and the rear spiral groove 14-3 in the axial hole of the motor rotor shaft 14, the boss inner cavity in the middle of the rear end of the inner cavity of the motor housing 8, the axial flow type pilot impeller 23, the flow passing groove of the rotor rear bearing 22, the flow passing hole 11-3 at the rear end of the inner cover 11, the flow passing groove 11-2 in the inner cavity of the inner cover 11, the flow passing gap between the inner cover 11 and the outer circle of the motor rotor 19, the flow passing hole 19-, An overflowing hole 18-2 on the bearing seat 18, an overflowing groove 16-2 of the rotor front bearing 16, a water throwing groove 15-2 on the rear end face of the axial thrust wheel 15 and an auxiliary pump water impeller 13-2 on the water pump impeller 13 form an internal water cooling system of the electric water pump.

In this embodiment, as the motor rotor 19 operates, the front spiral groove 14-1 in the axial hole of the motor rotor shaft 14 applies a backward thrust and a rotational thrust to the internal cooling water flowing into the axial hole of the motor rotor shaft 14, the internal cooling water in the axial hole of the motor rotor shaft 14 obtains an extra kinetic energy under the pushing of the front spiral groove 14-1 of the motor rotor shaft 14 and rotates to flow toward the rear end of the axial hole of the motor rotor shaft 14, the rear spiral groove 14-3 in the axial hole of the motor rotor shaft 14 further applies a backward thrust and a rotational thrust to the internal cooling water flowing in the axial hole of the motor rotor shaft 14, the internal cooling water in the axial hole of the motor rotor shaft 14 obtains an extra kinetic energy again and then flows out from the rear end of the axial hole of the motor rotor shaft 14, the internal cooling water in the middle water cavity at the rear end of the inner cavity of the motor housing 8 flows toward the water inlet region of the centrifugal force of the axial flow type pilot impeller 23 under the rotation effect, the internal cooling water flow washes the bottom surface of the boss inner cavity in the middle of the rear end of the inner cavity of the motor shell 8 to cool the motor shell 8 and the water pump controller 3 arranged at the rear end of the motor shell 8, the internal cooling water enters the rotor cavity in the inner cover 11 through the spiral overflowing hole 11-3 at the rear end of the inner cover 11 and the overflowing groove of the rotor rear bearing 22 under the pumping of the axial flow type pilot impeller 23, the internal cooling water flow takes away heat generated by the movement of the motor rotor shaft 14 in the bearing hole of the rotor rear bearing 22 and falling abrasive particles generated by friction pair in the process of flowing through the overflowing groove of the rotor rear bearing 22, and the working reliability of the rotor rear bearing 22 is improved.

In this embodiment, the spiral groove 19-3 on the outer circle of the motor rotor 19 applies a forward thrust and a rotational thrust to the internal cooling water flow between the inner cover 11 and the outer circle of the motor rotor 19 to increase the water flow speed of the internal cooling water, thereby improving the cooling effect of the internal cooling water flow on the motor rotor 19, the inner cover 11 and the inside of the motor stator 7 sleeved outside the inner cover 11, the internal cooling water in the rotor cavity flows along the overflow groove 11-2 on the inner hole wall of the inner cover 11, the overflow gap between the inner cover 11 and the outer circle of the motor rotor 19, the overflow hole 19-2 on the motor rotor 19 and the spiral groove 19-3 on the outer circle of the motor rotor 19 flow to the front end of the motor rotor 19 under the pushing action of the axial flow type pilot impeller 23 and the spiral groove 19-3 on the outer circle of the motor rotor 19, most of the internal cooling water flow at the front end of the motor rotor 19 flows into the auxiliary pump impeller 13 on the forward pump impeller 13 through the In the water inlet of the rotor 2, a small part of internal cooling water at the front end of the motor rotor 19 flows through the overflowing groove 16-2 of the rotor front bearing 16 and enters the water throwing groove 15-2 at the rear end of the axial thrust wheel 15, the water in the water throwing groove 15-2 at the rear end of the axial thrust wheel 15 is thrown into the water inlet of the auxiliary pump water impeller 13-2 on the water pump impeller 13 from the outlet of the water throwing groove 15-2 on the excircle of the axial thrust wheel 15 under the action of the rotating centrifugal force of the axial thrust wheel 15, and the cooling water flow in the overflowing groove 16-2 of the rotor front bearing 16 takes away heat generated by the movement of the motor rotor shaft 14 in the bearing hole of the rotor front bearing 16 and falling abrasive particles generated by friction of a friction pair, so that the working reliability of the rotor front bearing 16 is improved.

In this embodiment, the auxiliary pump water impeller 13-2 on the water pump impeller 13 pumps the internal cooling water to the water outlet of the water pump volute 12 to realize the continuous flow of the internal cooling water flow; the water pump impeller 13, the motor rotor shaft 14, the axial thrust wheel 15, the motor rotor 19 and the axial flow type guide impeller 23 form a rotary motion part assembly of the electric water pump, water in a water throwing groove 15-2 at the rear end of the axial thrust wheel 15 generates a hydraulic extrusion effect under the action of a rotary centrifugal force because the water throwing groove 15-2 is of a closed structure with a wide inner part and a narrow outer part, hydraulic pressure generated by the hydraulic extrusion effect in the water throwing groove 15-2 of the axial thrust wheel 15 buffers and lightens the impact of the rear end surface of the axial thrust wheel 15 on the front end surface of the rotor front bearing 16, internal cooling water in the water throwing groove 15-2 of the axial thrust wheel 15 is distributed on the front end surface of the rotor front bearing 16 to reduce the friction force of the rear end surface of the axial thrust wheel 15 on the front end surface of the rotor front bearing 16, internal cooling water in the water throwing groove 15-2 of the axial thrust wheel 15 takes away the friction heat of the rear end surface of the axial thrust wheel 15 and the front end surface of the rotor front bearing 16 and abrasive particles falling off by friction, the operational reliability of the axial thrust wheel 15 is improved.

In this embodiment, improve the radiating structure of coil and the respiratory cooling that respiratory expired the inner chamber hot-air and inhaled outside cold air on electric water pump's inside water cooling system and motor stator and constituted electric water pump's cooling system jointly, electric water pump's cooling system has restrained electric water pump's heat load to the radiating efficiency has been strengthened greatly, electric water pump moving high reliability is realized.

The above description is only for the preferred embodiment of the present invention, but the present invention should not be limited to the embodiment and the disclosure of the drawings, and therefore, all equivalent or modifications that do not depart from the spirit of the present invention are intended to fall within the scope of the present invention.

Claims

1. An electric water pump internal cooling system, includes motor casing, its characterized in that:

the water pump controller is installed in a counter bore at the rear end of the motor shell, the rear cover is installed at an orifice at the rear end of the motor shell, a mounting hole of a respirator is formed in the rear cover, an air duct and an air vent communicated with the inside and the outside of the rear cover are formed in the bottom of the mounting hole of the respirator on the rear cover, a notch is formed in the hole wall of one side of the mounting hole of the respirator on the rear cover, a ventilation window is formed in a respirator support, a flange is arranged on the outer edge of the end face of the respirator support, the ventilation film is fixed on the bottom face of the respirator support, a respirator sealing ring is arranged on the outer circle of the respirator support between the outer circle of the respirator support and the mounting hole of the rear cover, the respirator support, the ventilation film and the respirator sealing ring are installed in the respirator mounting hole on the rear cover, the flange on the end face;

the motor stator is arranged in a cavity of the motor shell, a stator coil sheath is arranged on the motor stator, a coil is arranged in a hollow groove of the stator coil sheath, a plurality of coil electric connection terminals are arranged on the stator coil sheath, the coil electric connection terminals are connected to a water pump controller arranged in a counter bore at the rear end of the motor shell, the head of the coil electric connection terminal in the same direction as the respirator is abutted against the end face of the respirator support, and the water pump volute is fastened on the motor shell;

the inner cover passes through a shaft center hole of a motor stator and is installed in an inner cavity of a motor shell, a spiral overflowing hole and a bearing installation hole are formed in the small end of the rear end of the inner cover, a rear bearing of a rotor is installed in the bearing installation hole in the rear end of the inner cover, a plurality of overflowing grooves are formed in the inner hole wall of the inner cover, a bearing seat is installed in a hole in the front end of the inner cover, and the spiral overflowing hole is formed in the bearing seat;

the motor rotor is arranged in a hole cavity of the inner cover, the axis of the motor rotor is provided with an axis through hole which penetrates through the front end face and the rear end face of the motor rotor, the motor rotor shaft is arranged in the axis through hole of the motor rotor, and the rear end of the motor rotor shaft penetrates through the bearing hole of the rotor rear bearing;

the excircle of the rear end head part of the motor rotor shaft is provided with an axial flow type pilot impeller, the front end of the motor rotor shaft penetrates through a bearing hole of a rotor front bearing, the excircle of the front end head part of the motor rotor shaft is provided with a water pump impeller, and an axial thrust wheel is arranged between the rear end surface of an axis lug of the water pump impeller and the front end surface of the rotor front bearing;

the rear end face of the axial thrust wheel is provided with a plurality of water throwing grooves which are wide near the axle center part and gradually narrow near the excircle part, the water throwing grooves at the rear end of the axial thrust wheel are communicated with the overflowing grooves of the front bearing of the rotor, the outer surface of the motor rotor is provided with a plastic coating wrapping the rotor, and the inside of the motor rotor is provided with a plurality of overflowing holes which penetrate through the inside and are communicated with the front end face and the rear end face of the motor rotor;

the plastic-coated excircle of the motor rotor is provided with a plurality of spiral grooves, the front end hole wall of the shaft center hole of the motor rotor shaft is provided with a front spiral groove, the rear end hole wall of the shaft center hole of the motor rotor shaft is provided with a rear spiral groove, and the part of the motor rotor shaft, which is close to the front end surface and the rear end surface of the motor rotor, is provided with a plurality of radial through holes communicated with the shaft center hole of the motor rotor shaft.

2. The electric water pump internal cooling system according to claim 1, wherein: the stator coil protection cover is characterized in that a plurality of pairs of wire clamping terminals and a plurality of wire clamping lugs are arranged on the end face of the stator coil protection cover, a wire clamping groove is formed in each wire clamping lug on the end face of the stator coil protection cover, a gap between each pair of wire clamping terminals on the end face of the stator coil protection cover forms a wire clamping groove, each pair of wire clamping terminals on the end face of the stator coil protection cover is connected to the corresponding coil power connection terminal through a copper bar embedded in the stator coil protection cover, a middle tap between each pair of coils is a wire tap in a non-broken state, and a middle tap winding between the coils is buckled into the wire clamping grooves in the end face of the stator coil protection cover and the.

3. The electric water pump internal cooling system according to claim 1, wherein: an inner cover small-head sealing ring is arranged between a small head at the rear end of the inner cover and an inner cavity boss at the rear end of the motor shell, an inner cover large-head sealing ring is arranged between a large head at the front end of the inner cover and an orifice of the motor shell, and a water pump volute sealing ring is arranged between the water pump volute and the front end head of the inner cover.

4. The electric water pump internal cooling system according to claim 1, wherein: and a rotor rear bearing damping ring is arranged between the rotor rear bearing and the bearing mounting hole at the rear end of the inner cover, and the front end orifice of the inner cover is of a conical structure with a large orifice diameter and a reduced diameter toward the orifice.

5. The electric water pump internal cooling system according to claim 1, wherein: the hole wall of the front end orifice of the inner cover is provided with a plurality of semicircular grooves, the excircle of the bearing seat is of a conical structure with a large front end diameter and a small rear end diameter, and the bearing seat is installed in the front end orifice of the inner cover.

6. The electric water pump internal cooling system of claim 5, wherein: the semicircular groove of the bearing seat is aligned with the semicircular groove of the inner cover to form a pin mounting hole, the semicircular groove of the bearing seat and the semicircular groove of the inner cover are arranged in the pin mounting hole, and the elastic cylindrical pin tightly supports the bearing seat in the front end hole of the inner cover.

7. The electric water pump internal cooling system according to claim 1, wherein: and a rotor front bearing damping ring is arranged between the rotor front bearing and the bearing mounting hole on the bearing block, a flange is arranged on the end surface of the rotor front bearing, and the front end of the rotor front bearing damping ring is propped against the rear end surface of the end surface flange of the rotor front bearing.

8. The electric water pump internal cooling system according to claim 1, wherein: the water pump impeller is provided with a main pump water impeller and an auxiliary pump water impeller, the main pump water impeller and the auxiliary pump water impeller form a whole, wherein the main pump water impeller pumps water flow from a water inlet of a water pump volute to a water outlet of the water pump volute, and the auxiliary pump water impeller pumps water flow from the water inlet of the water pump volute to the water outlet of the water pump volute after passing through an internal cooling flow channel.

9. The electric water pump internal cooling system according to claim 1, wherein: the back end of the pump impeller shaft lug is provided with a tooth-shaped boss, the front end surface of the axial thrust wheel is provided with a tooth-shaped pit, and the tooth-shaped boss at the back end of the pump impeller shaft lug is buckled in the tooth-shaped pit at the front end of the axial thrust wheel.

10. The electric water pump internal cooling system according to claim 1, wherein: the plastic coating of the motor rotor is embedded in the radial through hole of the motor rotor shaft.