Electronic water pump

[0032] Example 1

[0033] An electronic water pump, such as Figure 1 to Figure 13 As shown, it includes a pump cover 1, a front cover 2, a pump casing 3, and a bottom cover 4 connected in sequence from top to bottom. A working cavity 5 is formed between the pump cover 1 and the front cover 2, and an impeller 6 is arranged in the working cavity 5. The pump casing 3 is provided with a pump shaft 7 arranged in the center of the pump casing 3. The upper end of the pump shaft 7 is connected with the impeller 6 and drives the impeller 6 to rotate synchronously. The middle of the pump shaft 7 is provided with a central through hole 8. The upper end communicates with the working chamber 5 , the lower end of the central through hole 8 communicates with the interior of the pump casing 3 , the upper part of the pump cover 1 is provided with a water inlet 9 integrated with the pump cover 1 , and the water inlet 9 communicates with the working chamber 5 . The upper end of the pump shaft 7 is provided with an external thread, and the pump shaft 7 and the impeller 6 are connected by threads, which is convenient for the disassembly and installation between the pump shaft 7 and the impeller 6. The pump casing 3 is made of aluminum alloy or other metal materials. The contact area between the medium and the pump casing 3 is greatly increased. The rotor body 10, the stator body 11, and the control board 17 transfer heat to the working medium through the metal pump casing 3, improve the heat dissipation efficiency, reduce the temperature rise of the motor and the controller, and the working medium from The water inlet 9 enters the working chamber 5 of the pump, most of the working medium flows out from the outlet after being rotated and pressurized by the impeller 6, and a small part of the working medium flows from the top and bottom gaps of the impeller 6 to the central through hole 8 of the pump shaft 7 and the inside of the pump casing 3 respectively. , the working medium flowing into the pump casing 3 passes through the bearing and the rotor body 10 and then reaches the bottom of the metal pump casing 3. The heat of the stator body 11 and the control board 17 can be transferred to the working medium through the metal pump casing. The central through hole of the pump shaft 7 8. Connect the inside of the pump casing 3 with the water inlet 9 of the pump cover 1. When the impeller 6 pumps water, the fluid in the pump casing 3 forms a high pressure area, and the water inlet 9 of the pump cover 1 forms a low pressure area, so that the inside of the pump casing 3 is connected to the water inlet 9. A pressure difference is formed between the water inlets 9 of the pump cover 1, forming an inner circulation flow channel, and the working medium in the pump casing 3 flows out through the central through hole 8, which strengthens the heat dissipation of the working medium to the rotor body 10, and is beneficial to the shielding sleeve. Discharge of internal impurities.

[0034] The pump casing 3 is provided with a rotor body 10 and a stator body 11. The rotor body 10 is sleeved on the pump shaft 7 and rotates with the pump shaft 7. The stator body 11 is heat-fitted in the pump casing 3, and the rotor body 10 is set on the stator body. 11 , the inner wall of the pump casing 3 is provided with a positioning step 12 protruding inwardly. The positioning step 12 is set below the stator body 11 and abuts against the lower end of the stator body 11 . The stator body 11 is pressed against the lower end of the stator body 11 through the annular positioning step 12 , so as to improve the stability of the stator body 11 during operation.

[0035] The pump casing 3 is also provided with a sleeve 13 for isolating the rotor body 10 and the stator body 11. The sleeve 13 is vertically arranged in the pump casing 3, and the lower end of the sleeve 13 is fixedly connected to the middle of the pump casing 3. The rotor body 10 Inside the sleeve 13 , the sleeve 13 is inside the stator body 11 and abuts against the stator body 11 . The rotor body 10 and the stator body 11 are isolated by the sleeve 13, and the stator body 11 is sealed with glue, which ensures the sealing of the rotor body, reduces the air gap between the rotor body 10 and the stator body 11, and improves the performance of the rotor body. The working efficiency of the motor.

[0036] The material of the sleeve 13 is glass fiber, Kevlar fiber or carbon fiber, or a combination of various fibers. The sleeve 13 is a cylindrical structure, and the thickness of the sleeve 13 is greatly reduced by filament winding molding, thereby reducing the magnetic flux. the air gap loss, thereby reducing the torque coupling between the rotor body 10 and the stator body 11 .

[0037] The sleeve 13 includes multiple fiber layers 36, adjacent fiber layers 36 are spirally wound in a crossed form, and the angles formed by the adjacent fiber layers 36 and the central axis of the sleeve 13 are 20° and -20°, respectively. The strength of the sleeve 13 is enhanced by cross winding.

[0038] Example 2

[0039] An electronic water pump, such as Figure 1 to Figure 13 As shown, on the basis of Embodiment 1, a sealing groove 14 is opened on the upper end surface of the front cover 2, and a sealing ring 15 is arranged in the sealing groove 14 to cooperate with the sealing groove 14, and the sealing ring 15 is arranged below the impeller 6, A mounting section 16 integrally formed with the front cover 2 is arranged under the middle of the front cover 2 , the mounting section 16 extends from top to bottom, the pump shaft 7 penetrates through the mounting section 16 , and the mounting section 16 is provided with impellers sequentially from top to bottom The installation groove 17, the pump shaft through hole 18, the bearing installation groove 19, the lower end of the impeller 6 is arranged in the impeller installation groove 17, the bearing installation groove 19 is provided with a front bearing 20 which is matched with the bearing installation groove 19, and the front bearing is 20 sets On the pump shaft 7. A sealing ring 15 is arranged between the front cover 2 and the impeller 6 to prevent large particles of impurities from entering the rotor cavity, prevent the rotor body 10 from being stuck, and improve the life and reliability of the electronic water pump. The fitting is installed in the installation section 16 to improve the installation stability of each component, thereby improving the stability of the water pump during operation.

[0040] The front cover 2 is also provided with through holes 21 . The through holes 21 are annularly arranged between the bearing installation groove 19 and the sealing groove 14 . The through hole 21 communicates the working chamber 5 with the inside of the pump casing 3 , and when pumping water, it is convenient for a small amount of working medium to enter the inside of the pump casing 3 from the front cover 2 to dissipate heat inside the pump casing 3 .

[0041] The lower part of the installation section 16 is provided with a thrust bearing seat 22 and a thrust bearing 23 arranged in the thrust bearing seat 22. The thrust bearing seat 22 and the thrust bearing 23 are both sleeved on the pump shaft 7, and the side wall of the thrust bearing seat 22 is provided with There is an annular positioning groove 24 that is recessed outward, and a positioning convex ring 25 that protrudes outward is provided on the periphery of the lower end of the thrust bearing 23. The positioning convex ring 25 is fitted in the annular positioning groove 24. A recessed arc-shaped groove 26, the arc-shaped groove 26 is radially arranged on the thrust bearing 23, a bearing sleeve 27 is arranged between the thrust bearing 23 and the front bearing 20, the upper end of the bearing sleeve 27 is in contact with the front bearing 20, and the bearing The lower end of the sleeve 27 is in contact with the thrust bearing 23 , and the bearing sleeve 27 is sleeved on the pump shaft 7 . The thrust bearing 23 and the thrust bearing seat 22 are positioned and engaged by the positioning convex ring 25 and the annular positioning groove 24, which improves the connection strength and stability of the thrust bearing 23 and the thrust bearing seat 22, and prevents the thrust bearing 23 from sliding out during operation. Thrust bearing seat 22; when the working medium flows in the pump casing 3, the working medium flows into the thrust bearing 23 and the contact surface between the pump shaft 7 and the rotor body 10 through the arc-shaped groove 26, and cools and dissipates heat to the outside of the pump shaft 7, The use strength and service life of the pump shaft 7 are prolonged, and the deformation of the pump shaft 7 due to temperature changes is prevented, which affects the normal operation of the equipment.

[0042] Example 3

[0043] An electronic water pump, such as Figure 1 to Figure 13 As shown, on the basis of Embodiment 2, a bottom plate 28 is provided in the middle of the pump casing 3, a rear bearing seat 29 is provided on the bottom plate 28, and a rear bearing 30 adapted to the rear bearing seat 29 is provided in the rear bearing seat 29 , the rear bearing 30 is sleeved on the lower end of the pump shaft 7, the upper end of the rear bearing 30 is provided with an annular positioning ring 31, and the annular positioning ring 31 is in contact with the upper end of the rear bearing seat 29. The open groove 32 is arranged on the cloth, and the open groove 32 is vertically disposed on the rear bearing seat 29 . The rear bearing 30 is positioned inside the upper end of the rear bearing seat 29 by the annular positioning ring 31, so that after the working medium enters the inside of the pump shell 3, the working medium enters the bottom of the rear bearing seat 29 through the opening groove 32, and then enters the central through hole 8 of the pump shaft 7. , and then discharged from the inside of the pump shaft 7 to form a circulating flow channel.

[0044] An electrical room 33 is arranged below the bottom plate 28 , and the bottom cover 4 is arranged below the electrical room 33 and is connected to the lower end of the electrical room 33 . Through the wire hole 35, the connecting wire on the stator body 11 is connected to the control board 34 through the wire hole. The control board 34 and the pump casing 3 are sealed with glue. The connecting wire on the stator body 11 is a stator copper wire. The stator copper wire and the pins are pressure welded and fixed on the bottom of the pump casing 3. The pins are connected with the control board 34 by pressure welding. , the connection between the stator body 11 and the control board 34 is facilitated by setting the wire hole 35, the inner wall of the electrical room 33 is provided with a positioning arc segment 37, the positioning arc segment 37 is vertically arranged, and the bottom cover 4 is connected to the positioning arc segment by screws The lower end of 37 is connected, the edge of the bottom cover 4 is provided with a vertically arranged groove 38, the lower end of the pump casing 3 is inserted in the groove 38, and the groove 38 is also provided with an end face sealing ring, and the end face sealing ring is provided in the groove 38. below the pump casing 3.