An electric water pump with a control panel installed in the middle of the water pump

Abstract

The present invention relates to an electric water pump with a control panel installed in the middle of the water pump, comprising a water pump volute, a water pump impeller, a pump cover, a water pump control panel, a rotor, a rotor cover, an outer shell, a rear bearing, a stator, a thrust ring and a front bearing, wherein the water pump volute is installed on the front end surface of the pump cover, the water pump control panel is installed on the rear end surface of the pump cover, the port of the rotor cover is sleeved on the outer circle of the rear end boss of the pump cover, a pit is arranged on the rear end of the inner cavity of the rotor cover, the front bearing is installed in the front bearing mounting hole on the pump cover, the rotor is installed in the inner cavity of the rotor cover, a rotor blade is arranged on the rear end surface of the rotor, the axial through hole of the thrust ring is sleeved on the outer circle of the front end boss of the rotor, the water pump impeller is arranged on the front end outer circle of the rotor shaft, the stator is sleeved on the outer circle of the rotor cover, and the inner cavity of the outer shell is sleeved on the outer circle of the stator. The electric water pump has a good internal cooling system, has a good cooling effect on the control panel, the rotor and the stator, has a small heat load, and has high working reliability.

Description

Technical Field

[0001] The invention relates to an electric water pump, in particular to an electric water pump which is used in an automobile cooling system and has a control panel installed in the middle of the water pump. Background Art

[0002] With the development of electric vehicles, the driving motors and power batteries of electric vehicles and other power components need cooling systems to ensure their working performance and reliability. The cooling system of electric vehicles does not have the mechanical water pump driven by the engine of traditional fuel vehicles, and can only use electric water pumps driven by electricity. The motor control board of the motor and the driving motor will generate heat during operation. The overheating caused by the rotor magnetic eddy current will cause the demagnetization of the rotor permanent magnet, the stator overheating will cause the coil insulation to burn out, and the control board overheating will cause the control board components to burn out. The existing electric water pump uses a control board installed at the rear end of the water pump. The internal cooling method adopts immersion cooling in which the internal cooling water does not circulate. The internal heat cannot be dissipated well, and the cooling effect on the control board, rotor and stator is poor. The electric water pump has the hidden danger of overheating and damage. On the other hand, the motor rotor of the drive motor will produce torsional vibration under the drive of the alternating magnetic field force, and the water pump impeller will produce torsional vibration in the process of pumping water. The air in the inner cavity of the electric water pump is heated and cooled to produce thermal expansion and contraction effect, resulting in changes in the air pressure in the inner cavity of the electric water pump. The pressure difference between the inside and outside of the electric water pump causes the structural parts of the electric water pump to be subjected to additional stress, affecting the reliability of the electric water pump. Summary of the invention

[0003] In view of the shortcomings of the prior art, the present invention provides an electric water pump with a control board mounted in the middle of the water pump, which has good cooling effect on the control board, rotor and stator and has a small heat load;

[0004] The present invention adopts the following technical scheme: an electric water pump with a control panel installed in the middle of the water pump, comprising: a water pump volute, a water pump impeller, a pump cover, a water pump control panel, a rotor, a rotor cover, a housing, a rear bearing, a stator, a thrust ring and a front bearing, characterized in that: the water pump volute is installed on the front end surface of the pump cover, an annular boss is arranged on the front end surface of the pump cover, a pit is arranged in the central part of the front end annular boss of the pump cover, a front bearing mounting hole penetrating the front and rear end surfaces of the pump cover is arranged on the front end pit of the pump cover, a flow hole is arranged above the front bearing mounting hole of the pump cover, the water pump control panel is installed on the rear end surface of the pump cover, a boss is arranged in the central part of the rear end surface of the pump cover, the port of the rotor cover is sleeved on the outer circle of the rear end boss of the pump cover, a pit is arranged on the rear end of the inner cavity of the rotor cover, a plurality of bosses are arranged on the bottom surface of the pit at the rear end of the inner cavity of the rotor cover, the rear bearing is installed in the pit at the rear end of the inner cavity of the rotor cover, a flow groove is arranged in the bearing hole of the rear bearing, the front bearing is installed In the front bearing mounting hole on the pump cover, a flow groove is arranged in the bearing hole of the front bearing, the rotor is arranged in the inner cavity of the rotor cover, a rotor blade is arranged on the rear end face of the rotor, a spiral protrusion is arranged on the outer circle of the rotor, a boss is arranged on the front end face of the rotor, a convex tooth is arranged on the outside of the front end boss of the rotor, a flow groove is arranged inside the front end boss of the rotor, a through hole penetrating the front and rear ends is arranged on the axis of the rotor, a plurality of radial through holes penetrating the axial through hole are arranged on the front axial surface of the rotor, a plurality of flow holes penetrating the front and rear end faces of the rotor are arranged inside the rotor, a through hole is arranged at the axis of the thrust ring, the axial through hole of the thrust ring is sleeved on the outer circle of the front end boss of the rotor, a water pump impeller is arranged on the front end outer circle of the rotor shaft, the front end shaft section of the rotor is supported in the bearing hole of the front bearing, the rear end shaft section of the rotor is supported in the bearing hole of the rear bearing, the stator is sleeved on the outer circle of the rotor cover, a protrusion is arranged on the outer circle of the stator, and the inner cavity of the shell is sleeved on the outer circle of the stator.

[0005] Preferably, a vent hole connecting the inner cavity of the shell and the outside is provided on the rear end surface of the shell, a boss is provided at the bottom of the inner cavity of the shell, a pit is provided inside the boss at the bottom of the inner cavity of the rear end of the shell, and the respirator is installed in the inner pit of the boss at the bottom of the inner cavity of the rear end of the shell, and the respirator is provided with a breathable air-permeable membrane that can block liquid but allow gas to pass through.

[0006] Preferably, a capacitor mounting boss is arranged on the rear end surface of the head of the housing, the interior of the capacitor mounting boss of the housing is arranged as a cavity, and the internal cavity of the capacitor mounting boss of the housing is sleeved on the driving capacitor on the water pump control board.

[0007] Preferably, a boss is provided on the lower end surface of the machine foot of the shell, and the machine foot vibration-damping pad is sleeved on the boss on the lower end of the machine foot of the shell.

[0008] Preferably, an axial groove is provided on the inner cavity wall of the shell, and the protrusion on the outer circle of the stator is buckled in the axial groove on the inner cavity wall of the shell.

[0009] Preferably, a rear bearing vibration damping ring is arranged in the gap between the rear end pit of the rotor cover inner cavity and the outer circle of the rear bearing, and a front bearing vibration damping ring is arranged in the gap between the front bearing mounting hole on the pump cover and the outer circle of the front bearing.

[0010] Preferably, a plug is provided at the front end of the axial through hole of the rotor.

[0011] Preferably, the boss on the bottom surface of the rear end of the rotor cover inner cavity is pressed against the rear end surface of the rotor shaft of the rotor, a groove is provided on the edge of the thrust ring axial through hole, a groove is provided on the front end surface of the thrust ring, the axial through hole of the thrust ring is sleeved on the outer circle of the front end boss of the rotor, the rear end surface of the thrust ring is against the front end surface of the reinforcing rib on the periphery of the front end boss of the rotor, the front end surface of the thrust ring is against the rear end surface of the front bearing, and the external convex teeth of the front end boss of the rotor are buckled into the groove on the edge of the axial through hole of the thrust ring.

[0012] Preferably, the power socket is mounted on the rear end face of the upper portion of the housing, and the front end face of the housing is pressed tightly against the housing sealing ring under the action of the tightening force of the connecting screws.

[0013] Preferably, a plurality of raised reinforcing ribs are provided inside the front end annular boss of the pump cover.

[0014] The beneficial effects of the electric water pump provided by the present invention with the control panel installed in the middle of the water pump are:

[0015] 1) The electric water pump has a good internal cooling system. In the actual cooling process, a part of the water behind the water pump impeller directly enters the axial through hole of the rotor through the radial through hole on the front axial surface of the rotor. Another part of the water behind the water pump impeller passes through the bearing hole flow groove of the front bearing, the axial through hole of the thrust ring, and the internal flow groove of the rotor front end boss, and then enters the axial through hole of the rotor from the radial through hole on the front axial surface of the rotor to form an internal cooling water flow. The internal cooling water flow flows backward along the axial through hole of the rotor through the rear end pit of the rotor cover inner cavity and the bearing hole flow groove of the rear bearing into the rear end of the rotor, and then from the rear end of the rotor The rotor blades on the surface are pumped to the rear outer circle area of ​​the rotor. A part of the internal cooling water in the rear outer circle area of ​​the rotor flows along the internal flow holes of the rotor to the front end of the rotor. The other part of the internal cooling water in the rear outer circle area of ​​the rotor flows along the gap between the outer circle of the rotor and the inner wall of the rotor cover to the front end of the rotor under the push of the spiral protrusion on the outer circle of the rotor. The internal cooling water at the front end of the rotor enters the water outlet of the water pump volute from the front water cavity of the pump cover through the flow holes on the pump cover. The electric water pump has a small heat load during actual operation and can achieve good cooling of the control panel, rotor and stator.

[0016] 2) In the electric water pump, the water pump control board is installed on the rear end face of the pump cover in the middle of the water pump. The water pump control board is directly cooled by the water flow in the water pump volute through the pump cover, thereby achieving high reliability of the water pump control board. In terms of friction load, the water pressure behind the water pump impeller is higher than the water pressure in front of the water pump impeller when the rotor drives the water pump impeller to rotate, thereby generating a forward axial thrust on the water pump impeller. The forward axial thrust of the water pump impeller is transmitted through the rotor and the thrust ring and acts on the rear end face of the front bearing from the front end face of the thrust ring. The spiral protrusion on the outer circle of the rotor pushes the internal cooling water to the front end of the rotor. The reaction force generates a backward axial thrust on the rotor, which suppresses the forward axial thrust received by the rotor, reduces the pressure of the front end face of the thrust ring on the rear end face of the front bearing, and the water in the groove on the front end face of the thrust ring is coated on the rear end face of the front bearing during the rotation of the thrust ring, further reducing the friction between the front end face of the thrust ring and the rear end face of the front bearing, thereby improving the working reliability of the electric water pump.

[0017] 3) The electric water pump is provided with a breathable and air-permeable membrane on the respirator which can block liquid but pass gas. When the internal air pressure of the electric water pump is greater than the external air pressure, the gas inside the electric water pump is exhaled outwards through the respirator and the air vents on the rear end face of the shell. When the internal air pressure of the electric water pump is lower than the external air pressure, the gas outside the electric water pump is inhaled inwards through the air vents on the rear end face of the shell and the respirator, thereby achieving pressure balance inside and outside the electric water pump and suppressing additional stress caused by pressure difference due to thermal expansion and contraction of the gas in the inner cavity of the electric water pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural cross-sectional view of the present invention;

[0019] Figure 2 is a rear view of the present invention;

[0020] Figure 3 is a view of the rotor of the present invention;

[0021] Figure 4 is a thrust ring view of the present invention;

[0022] Figure 5 It is a front view of a pump cover of the present invention. DETAILED DESCRIPTION

[0023] The "front" and "rear" directions mentioned in this manual refer to the side close to the water pump volute as the front and the side close to the water pump controller cover as the rear, and the same applies hereinafter.

[0024] The implementation of the present invention will be further described below in conjunction with the accompanying drawings:

[0025] Reference Figures 1 to 5As shown, an electric water pump with a control panel installed in the middle of the water pump comprises 1 a water pump volute, 2 a water pump impeller, 3 a volute sealing ring, 4 a pump cover, 5 a housing sealing ring, 6 a water pump control panel, 7 a power socket, 8 a rotor, 9 a rotor cover, 10 a housing, 11 a rear bearing, 12 a rear bearing vibration damping ring, 13 a respirator sealing ring, 14 a respirator, 15 a stator, 16 a thrust ring, 17 a front bearing, 18 a front bearing vibration damping ring, 19 a rotor cover sealing ring, 20 a plug and 21 a machine foot vibration damping pad, wherein the water pump volute 1 is installed on the front end surface of the pump cover 4, an annular boss 4.1 is arranged on the front end surface of the pump cover 4, a pit 4.2 is arranged at the central part of the front end annular boss 4.1 of the pump cover 4, a front bearing mounting hole 4.3 penetrating the front and rear end surfaces of the pump cover 4 is arranged on the front end pit 4.2 of the pump cover 4, and a plurality of raised reinforcing ribs 4.4 are arranged inside the front end annular boss 4.1 of the pump cover 4;

[0026] A flow hole 4.5 is arranged above the front bearing mounting hole 4.3 of the pump cover 4, a volute sealing ring 3 is arranged in the gap between the outer circle of the annular boss 4.1 at the front end of the pump cover 4 and the port of the water pump volute 1, a sealing ring mounting groove 4.6 is arranged on the outer edge of the rear end surface of the pump cover 4, and the housing sealing ring 5 is installed in the sealing ring mounting groove 4.6 on the outer edge of the rear end surface of the pump cover 4;

[0027] The water pump control board 6 is installed on the rear end surface of the pump cover 4. The water pump control board 6 is provided with a vertically installed driving capacitor 6.1. A boss 4.7 is provided at the central part of the rear end surface of the pump cover 4. The port of the rotor cover 9 is sleeved on the outer circle of the boss 4.7 at the rear end of the pump cover 4. A rotor cover sealing ring 19 is provided in the gap between the outer circle of the boss 4.7 at the rear end of the pump cover 4 and the port of the rotor cover 9. A pit 9.2 is provided on the rear end of the inner cavity of the rotor cover 9. A plurality of bosses 9.1 are provided on the bottom surface of the pit 9.2 at the rear end of the inner cavity of the rotor cover 9.

[0028] The rear bearing 11 is installed in the rear end pit 9.2 of the inner cavity of the rotor cover 9, and a flow groove is arranged in the bearing hole of the rear bearing 11. A rear bearing damping ring 12 is arranged in the gap between the rear end pit 9.2 of the inner cavity of the rotor cover 9 and the outer circle of the rear bearing 11. The front bearing 17 is installed in the front bearing mounting hole 4.3 on the pump cover 4, and a flow groove is arranged in the bearing hole of the front bearing 17. A front bearing damping ring 18 is arranged in the gap between the front bearing mounting hole 4.3 on the pump cover 4 and the outer circle of the front bearing 17. The front bearing damping ring 18 and the rear bearing damping ring 12 jointly suppress the transmission of the vibration of the rotor 8 to the outside;

[0029] The rotor 8 is installed in the inner cavity of the rotor cover 9, and a rotor blade 8.1 is arranged on the rear end face of the rotor 8, a spiral protrusion 8.2 is arranged on the outer circle of the rotor 8, a boss 8.3 is arranged on the front end face of the rotor 8, and a convex tooth 8.4 is arranged on the outside of the front end boss 8.3 of the rotor 8, and a flow groove 8.5 is arranged inside the front end boss 8.3 of the rotor 8, and a reinforcing rib 8.6 is arranged on the periphery of the front end boss 8.3 of the rotor 8. A through hole 8.7 penetrating the front and rear ends is arranged on the axis of the rotor 8, and a plurality of radial through holes 8.8 penetrating the axis through hole 8.7 are arranged on the front axial surface of the rotor 8, and a plurality of flow holes 8.9 penetrating the front and rear end faces of the rotor 8 are arranged inside the rotor 8, and a plug 20 is arranged at the front end of the axis through hole 8.7 of the rotor 8 to prevent the internal cooling water from flowing back to the water suction area in front of the water pump impeller 2;

[0030] A water pump impeller 2 is arranged on the front outer circle of the rotor 8 shaft, the front shaft section of the rotor 8 is supported in the bearing hole of the front bearing 17, the rear shaft section of the rotor 8 is supported in the bearing hole of the rear bearing 11, and the boss 9.1 on the rear bottom surface of the inner cavity of the rotor cover 9 presses on the rear end surface of the rotor shaft of the rotor 8 to limit the backward movement of the rotor 8;

[0031] A through hole 16.1 is provided at the axis of the thrust ring 16, a groove 16.2 is provided on the edge of the through hole 16.1 of the axis of the thrust ring 16, a groove 16.3 is provided on the front end surface of the thrust ring 16, the through hole 16.1 of the axis of the thrust ring 16 is sleeved on the outer circle of the front end boss 8.3 of the rotor 8, the rear end surface of the thrust ring 16 abuts against the front end surface of the reinforcing rib 8.6 on the periphery of the front end boss 8.3 of the rotor 8, the front end surface of the thrust ring 16 abuts against the rear end surface of the front bearing 17 to limit the forward movement of the rotor 8, the outer convex teeth 8.4 of the front end boss 8.3 of the rotor 8 are buckled into the groove 16.2 on the edge of the through hole 16.1 of the axis of the thrust ring 16 to drive the thrust ring 16 to rotate synchronously with the rotor 8;

[0032] The stator 15 is sleeved on the outer circle of the rotor cover 9, and a protrusion 15.1 is arranged on the outer circle of the stator 15. The inner cavity of the housing 10 is sleeved on the outer circle of the stator 15. The power socket 7 is installed on the rear end surface of the upper part of the housing 10. The front end surface of the housing 10 is pressed tightly on the housing sealing ring 5 under the action of the tightening force of the connecting screws. A vent hole 10.1 connecting the inner cavity of the housing 10 and the outside is arranged on the rear end surface of the housing 10. A boss 10.2 is arranged at the bottom of the inner cavity of the housing 10, and a pit is arranged inside the boss 10.2 at the bottom of the inner cavity of the rear end of the housing 10.

[0033] The respirator 14 is installed in the inner pit of the bottom boss 10.2 of the inner cavity at the rear end of the shell 10, and a respirator sealing ring 13 is arranged in the gap between the inner pit of the bottom boss 10.2 of the inner cavity at the rear end of the shell 10 and the outer circle of the respirator 14. A capacitor mounting boss 10.3 is arranged on the rear end surface of the head of the shell 10, and the inside of the capacitor mounting boss 10.3 of the shell 10 is arranged to form a cavity. The inner cavity of the capacitor mounting boss 10.3 of the shell 10 is sleeved on the driving capacitor 6.1 on the water pump control board 6, and a boss 10.4 is arranged on the lower end surface of the machine foot of the shell 10, and the machine foot vibration damping pad 21 is sleeved on the lower end boss 10.4 of the machine foot of the shell 10;

[0034] An axial groove 10.5 is provided on the inner cavity wall of the housing 10, and a protrusion 15.1 on the outer circle of the stator 15 is buckled in the axial groove 10.5 on the inner cavity wall of the housing 10 to suppress the torsional vibration of the stator 15;

[0035] The respirator 14 is provided with a breathable membrane that can block liquid but can pass gas. When the internal air pressure of the electric water pump is greater than the external air pressure, the gas inside the electric water pump is exhaled outward through the respirator 14 and the vent 10.1 on the rear end surface of the shell 10. When the internal air pressure of the electric water pump is less than the external air pressure, the gas outside the electric water pump is sucked inward through the vent 10.1 on the rear end surface of the shell 10 and the respirator 14 to achieve pressure balance inside and outside the electric water pump, thereby suppressing additional stress caused by pressure difference caused by thermal expansion and contraction of the gas in the inner cavity of the electric water pump;

[0036] In terms of internal cooling, a portion of the water behind the water pump impeller 2 directly enters the axial through hole 8.7 of the rotor 8 through the radial through hole 8.8 on the front axial surface of the rotor 8, and another portion of the water behind the water pump impeller 2 passes through the bearing hole flow groove of the front bearing 17, the axial through hole 16.1 of the thrust ring 16, and the internal flow groove 8.5 of the front end boss 8.3 of the rotor 8, and then enters the axial through hole 8.7 of the rotor 8 from the radial through hole 8.8 on the front axial surface of the rotor 8 to form an internal cooling water flow. The internal cooling water flow flows backward along the axial through hole 8.7 of the rotor 8, passes through the rear end pit 9.2 of the inner cavity of the rotor cover 9 and the bearing hole flow groove of the rear bearing 11, enters the rear end of the rotor, and is then pumped to the rotor 8 by the rotor blades 8.1 on the rear end surface of the rotor 8. In the rear outer circle area, a part of the internal cooling water flow in the rear outer circle area of ​​the rotor 8 flows along the internal flow holes 8.9 of the rotor 8 to the front end of the rotor 8, and another part of the internal cooling water in the rear outer circle area of ​​the rotor 8 flows along the gap between the outer circle of the rotor 8 and the inner wall of the rotor cover 9 to the front end of the rotor 8 under the push of the spiral protrusion 8.2 on the outer circle of the rotor 8. The internal cooling water at the front end of the rotor 8 enters the water outlet of the water pump volute 1 from the front water cavity of the pump cover 4 through the flow holes 4.5 on the pump cover 4 to form an internal cooling system. At the same time, the water pump control board 6 is installed on the rear end face of the pump cover 4 in the middle of the water pump. The water pump control board 6 is directly cooled by the water flow in the water pump volute 1 through the pump cover 4, so that the high reliability of the water pump control board 6 is achieved;

[0037] In terms of friction load, the water pressure behind the water pump impeller 2 is higher than the water pressure in front of the water pump impeller 2 when the rotor 8 drives the water pump impeller 2 to rotate, thereby generating a forward axial thrust on the water pump impeller 2. The forward axial thrust of the water pump impeller 2 is transmitted through the rotor 8 and the thrust ring 16 and acts on the rear end face of the front bearing 17 from the front end face of the thrust ring 16. The reaction force of the spiral protrusion 8.2 on the outer circle of the rotor 8 pushing the internal cooling water to the front end of the rotor 8 generates a backward axial thrust on the rotor 8, thereby suppressing the forward axial thrust received by the rotor 8, reducing the pressure of the front end face of the thrust ring 16 on the rear end face of the front bearing 17, and the water in the groove 16.3 on the front end face of the thrust ring 16 is coated on the rear end face of the front bearing 17 during the rotation of the thrust ring 16, further reducing the friction between the front end face of the thrust ring 16 and the rear end face of the front bearing 17, thereby improving the working reliability of the electric water pump.

[0038] The above description is only a preferred embodiment of the present invention, but the present invention should not be limited to the contents disclosed in the embodiment and the drawings, so any equivalent or modification completed without departing from the spirit disclosed in the present invention shall fall within the scope of protection of the present invention.

Claims

1. An electric water pump with a control panel installed in the middle of the water pump, comprising: A water pump volute, a water pump impeller, a pump cover, a water pump control panel, a rotor, a rotor cover, a housing, a rear bearing, a stator, a thrust ring and a front bearing, characterized in that: the water pump volute is mounted on the front end surface of the pump cover, an annular boss is arranged on the front end surface of the pump cover, a pit is arranged in the central part of the front end annular boss of the pump cover, a front bearing mounting hole penetrating the front and rear end surfaces of the pump cover is arranged on the front end pit of the pump cover, a flow hole is arranged above the front bearing mounting hole of the pump cover, the water pump control panel is mounted on the rear end surface of the pump cover, a boss is arranged in the central part of the rear end surface of the pump cover, the port of the rotor cover is sleeved on the outer circle of the rear end boss of the pump cover, a pit is arranged on the rear end of the inner cavity of the rotor cover, a plurality of bosses are arranged on the bottom surface of the pit at the rear end of the inner cavity of the rotor cover, the rear bearing is mounted in the pit at the rear end of the inner cavity of the rotor cover, a flow groove is arranged in the bearing hole of the rear bearing, the front bearing is mounted in the front bearing mounting hole on the pump cover, the front bearing A flow groove is provided in the bearing hole, the rotor is installed in the inner cavity of the rotor cover, a rotor blade is provided on the rear end face of the rotor, a spiral protrusion is provided on the outer circle of the rotor, a boss is provided on the front end face of the rotor, a convex tooth is provided on the outside of the front end boss of the rotor, a flow groove is provided inside the front end boss of the rotor, a through hole penetrating the front and rear ends is provided on the axis of the rotor, a plurality of radial through holes penetrating the axial through hole are provided on the front axial surface of the rotor, a plurality of flow holes penetrating the front and rear end faces of the rotor are provided inside the rotor, a through hole is provided at the axis of the thrust ring, the axial through hole of the thrust ring is sleeved on the outer circle of the front end boss of the rotor, a water pump impeller is provided on the front end outer circle of the rotor shaft, the front end shaft section of the rotor is supported in the bearing hole of the front bearing, the rear end shaft section of the rotor is supported in the bearing hole of the rear bearing, the stator is sleeved on the outer circle of the rotor cover, a protrusion is provided on the outer circle of the stator, and the inner cavity of the outer shell is sleeved on the outer circle of the stator.

2. The electric water pump with the control panel installed in the middle of the water pump according to claim 1 is characterized in that: A vent hole connecting the inner cavity of the shell and the outside is arranged on the rear end surface of the shell, a boss is arranged at the bottom of the inner cavity of the shell, a pit is arranged inside the boss at the bottom of the inner cavity of the rear end of the shell, the respirator is installed in the inner pit of the boss at the bottom of the inner cavity of the rear end of the shell, and the respirator is provided with a breathable air-permeable membrane that can block liquid but allow gas to pass through.

3. The electric water pump with the control panel installed in the middle of the water pump according to claim 2, characterized in that: A capacitor mounting boss is arranged on the rear end surface of the head of the shell, the interior of the capacitor mounting boss of the shell is arranged as a cavity, and the interior cavity of the capacitor mounting boss of the shell is sleeved on the driving capacitor on the water pump control board.

4. The electric water pump with the control panel installed in the middle of the water pump according to claim 1 is characterized in that: A boss is arranged on the lower end surface of the machine foot of the shell, and the machine foot vibration-damping pad is sleeved on the boss on the lower end of the machine foot of the shell.

5. The electric water pump with the control panel installed in the middle of the water pump according to claim 1 is characterized in that: An axial groove is arranged on the inner cavity hole wall of the shell, and the protrusion on the outer circle of the stator is buckled in the axial groove on the inner cavity hole wall of the shell.

6. The electric water pump with the control panel installed in the middle of the water pump according to claim 1, characterized in that: A rear bearing damping ring is arranged in the gap between the rear end recess of the rotor cover inner cavity and the outer circle of the rear bearing, and a front bearing damping ring is arranged in the gap between the front bearing mounting hole on the pump cover and the outer circle of the front bearing.

7. The electric water pump with the control panel installed in the middle of the water pump according to claim 1, characterized in that: A plug is arranged at the front end of the axial through hole of the rotor.

8. The electric water pump with the control panel installed in the middle of the water pump according to claim 1, characterized in that: The boss on the bottom surface of the rear end of the rotor cover inner cavity is pressed against the rear end surface of the rotor shaft of the rotor, a groove is provided on the edge of the thrust ring axial through hole, a groove is provided on the front end surface of the thrust ring, the axial through hole of the thrust ring is sleeved on the outer circle of the front end boss of the rotor, the rear end surface of the thrust ring is pressed against the front end surface of the reinforcing ribs on the periphery of the front end boss of the rotor, the front end surface of the thrust ring is pressed against the rear end surface of the front bearing, and the external convex teeth of the front end boss of the rotor are buckled into the groove on the edge of the axial through hole of the thrust ring.

9. The electric water pump with the control panel installed in the middle of the water pump according to claim 1, characterized in that: The power socket is installed on the rear end surface of the upper part of the shell, and the front end surface of the shell is tightly pressed on the shell sealing ring under the action of the tightening force of the connecting screws.

10. The electric water pump with the control panel installed in the middle of the water pump according to claim 1, characterized in that: A plurality of raised reinforcing ribs are arranged inside the annular boss at the front end of the pump cover.

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