An electronic water pump with a longer service life

Abstract

The present invention discloses an electronic water pump with a long service life, comprising a motor housing, a stator, a rotor with a rotor shaft, a water pump housing fixed to one side of the motor housing and forming a water pump cavity, an impeller located in the water pump cavity, and an insulating isolation sleeve arranged in the motor housing to divide the motor housing into a stator cavity and a rotor cavity. The rotor shaft is provided with a penetrating rotor shaft through hole along the axis direction. The front bearing is provided with a front bearing gap hole for connecting the water pump cavity with the rotor cavity, and the rear bearing is provided with a rear bearing gap hole for connecting the rotor cavity with the rotor shaft through hole. The front bearing gap hole, the rear bearing gap hole, and the rotor shaft through hole are connected to the rotor cavity and the water pump cavity together, and the front bearing and the rear bearing are directly cooled by water flowing into the water pump, which greatly improves the cooling effect on the bearings and prolongs the service life of the water pump.

Description

Technical Field

[0001] The invention relates to an electronic water pump with a longer service life. Background Art

[0002] In the prior art, the electronic water pump structure is prone to overheating and burning when rotating at high speed. Most of the current water pumps use a sealed shaft. The motor part of the structure mainly includes components such as the stator, rotor, and bearings. The water pump part mainly includes an impeller and a pump body with a water inlet and a water outlet. The water pump and the motor are sealed and separated. However, the heat generated by the motor during the operation of the electronic water pump structure is mainly caused by the friction generated by the high-speed rotation of the bearing. If it cannot be effectively cooled, it will directly affect the service life and performance of the entire water pump. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide an electronic water pump with a longer service life.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: an electronic water pump with a longer service life, comprising a motor housing, a stator arranged in the motor housing, a rotor with a rotor shaft, a water pump housing fixed to one side of the motor housing and forming a water pump cavity, an impeller located in the water pump cavity, and an insulating isolation sleeve arranged in the motor housing to divide the motor housing into a stator cavity and a rotor cavity, the stator cavity is a sealed cavity, the stator is located in the stator cavity, the rotor is located in the rotor cavity, the output part and the tail part of the rotor shaft are rotatably connected to the motor housing through a front bearing and a rear bearing respectively, the impeller is fixed to the output end of the rotor shaft, the rotor shaft is provided with a penetrating rotor shaft through hole along the axial centerline direction, the front bearing is provided with a front bearing gap hole for connecting the water pump cavity with the rotor cavity, and the rear bearing is provided with a rear bearing gap hole for connecting the rotor cavity with the rotor shaft through hole.

[0005] In some embodiments, an impeller cover for positioning the impeller is also fixed to the output end of the rotor shaft, and the impeller cover has a hollow cover cavity. The impeller cover also has a plurality of cover through holes for connecting the cover cavity with the water pump cavity, and the center lines of the plurality of cover through holes are respectively inclined toward the impeller and intersect with the axial center line of the impeller cover at the same point.

[0006] In some embodiments, a plurality of permanent magnet mounting holes are provided on the output side end surface of the motor housing, and a plurality of permanent magnets are respectively mounted in corresponding permanent magnet mounting holes and fixed by epoxy resin potting.

[0007] In some embodiments, the plurality of permanent magnets are evenly distributed along a circumferential direction with the axis of the rotor shaft as the center to form a circle of magnetic annular bands, and the circle where the outermost point of the impeller blade contour is located faces the magnetic annular band.

[0008] In some embodiments, an MR magnet is fixed to the rear end of the rotor shaft, the motor housing includes a ring shell body and a control board end cover fixed to the rear side of the ring shell body, and a magnetic sensor for detecting the magnetic field of the MR magnet is provided on the outer surface of the control board end cover.

[0009] In some embodiments, the inner ring of the tail end of the rotor shaft is provided with a stepped expansion hole connected to the rotor shaft through hole, and a stainless steel sleeve and the MR magnet sleeved on the stainless steel sleeve are sequentially installed in the stepped hole, and a stainless steel cover is provided on the stainless steel sleeve, the MR magnet and the tail end of the rotor shaft by laser welding, and the N and S poles of the MR magnet are radially magnetized.

[0010] In some embodiments, the insulating isolation sleeve is injection molded from glass fiber engineering plastic, and a plurality of semicircular arc reinforcement ribs evenly distributed and extending axially are provided on the outer ring of the insulating isolation sleeve. The stator inner ring has a plurality of gap grooves evenly distributed and extending axially, and each of the semicircular arc reinforcement ribs is clamped in the corresponding gap groove.

[0011] In some embodiments, the output side and the tail side of the insulating isolation sleeve are sealed with a first O-ring and a second O-ring respectively, the first O-ring is arranged on the insulating isolation sleeve and clamped on the output side of the motor housing, and a conical surface is provided on the inner side of the tail end of the insulating isolation sleeve and the second O-ring is pressed onto the control board end cover through the conical surface.

[0012] In some embodiments, the control panel end cover has a shaft mounting hole in the middle, and the inner wall of the shaft mounting hole is provided with a plurality of notches evenly distributed and extending in the axial direction, and also provided with an annular groove connecting all the notches, and a damping rubber ring is filled in the annular groove and the notches, and the damping rubber ring is tightly sleeved on the outer ring of the rear bearing.

[0013] In some embodiments, the rotor shaft is made of stainless steel SUSU304, and the front bearing and the rear bearing are both open ceramic ball bearings.

[0014] The scope of the present invention is not limited to the technical solutions formed by a specific combination of the above technical features, but also includes other technical solutions formed by any combination of the above technical features or their equivalent features. For example, the above features are replaced with (but not limited to) technical features with similar functions disclosed in this application.

[0015] Due to the application of the above technical scheme, the present invention has the following advantages compared with the prior art: the present invention provides an electronic water pump with a longer service life, and a front bearing clearance hole and a rear bearing clearance hole are respectively arranged on the front bearing and the rear bearing, and a rotor shaft through hole is arranged in the rotor shaft. The three are connected together with the rotor cavity and the water pump cavity, and the front bearing and the rear bearing are directly cooled by the water flowing into the water pump, which greatly improves the cooling effect of the front bearing and the rear bearing, and has a lubrication effect at the same time, greatly improves the working conditions of the bearings, reduces the noise of the high-speed operation of the front bearing and the rear bearing, and makes it run smoothly, thereby extending the service life and reliability of the entire water pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of an electronic water pump with a relatively long service life and its water flow direction;

[0017] Figure 2 It is a schematic diagram of the permanent magnet mounting hole and the permanent magnet;

[0018] Figure 3 It is a schematic diagram of the insulating sleeve and its semicircular arc reinforcement ribs;

[0019] Figure 4 Schematic diagram of the stator and its gap slots;

[0020] Figure 5 This is a schematic diagram of the control panel end cover shaft mounting hole and damping rubber ring;

[0021] Figure 6 For MR magnetic steel intention;

[0022] Among them: 1. Motor housing; 101. Ring housing body; 101a. Permanent magnet mounting hole; 102. Control board end cover; 102a. Notch; 102b. Ring groove; 2. Stator; 2a. Gap groove; 3. Rotor; 31. Rotor shaft; 31a. Rotor shaft through hole; 4. Water pump housing; 5. Impeller; 6. Insulating isolation sleeve; 6a. Semicircular arc reinforcement rib; 7. Front bearing; 8. Rear bearing; 9. Impeller gland; 9a. Gland through hole; 10. Permanent magnet; 13. MR magnet; 14. Magnetic sensor; 15. Stainless steel sleeve; 16. Stainless steel cover; 17. First O-ring; 18. Second O-ring; 19. Damping rubber ring. DETAILED DESCRIPTION

[0023] The following are specific examples of the present invention and combined with the figures to further describe the technical solution of the present invention, but the present invention is not limited to these examples.

[0024] An electronic water pump with a long service life, comprising a motor housing 1, a stator 2 arranged in the motor housing 1, a rotor 3 having a rotor shaft 31, a water pump housing 4 fixed to one side of the motor housing 1 and forming a water pump cavity, an impeller 5 located in the water pump cavity, and an insulating isolation sleeve 6 arranged in the motor housing 1 to separate the motor housing 1 into a stator cavity and a rotor cavity, wherein the stator cavity is a sealed cavity, the stator 2 is located in the stator cavity, the rotor 3 is located in the rotor cavity, and the output portion and tail portion of the rotor shaft 31 are The motor housing 1 is rotatably connected to the rotor shaft 31 through a front bearing 7 and a rear bearing 8, respectively. The rotor shaft 31 is provided with a penetrating rotor shaft through hole 31a along the axial direction. The front bearing 7 is provided with a front bearing clearance hole for connecting the water pump cavity with the rotor cavity. The rear bearing 8 is provided with a rear bearing clearance hole for connecting the rotor cavity with the rotor shaft through hole. The clearance hole can be provided on the ball retainer or directly on the ball. However, the ball is preferably an elliptical ball. It can also be directly a gap between the bearing components.

[0025] The impeller 5 is fixed to the output end of the rotor shaft 31. The impeller cover 9 for positioning the impeller 5 is also fixed to the output end of the rotor shaft 31. The impeller cover is located on the outside of the impeller. The impeller cover 9 has a hollow cover cavity. The impeller cover 9 also has a plurality of cover through holes 9a for connecting the cover cavity with the water pump cavity. The center lines of the plurality of cover through holes 9a are respectively inclined toward the impeller 5 and intersect with the axis center line of the impeller cover 9 at the same point.

[0026] like Figure 2 As shown, a plurality of permanent magnet mounting holes 101a are provided on the output side end face of the motor housing 1, and a plurality of permanent magnets 10 are respectively installed in the corresponding permanent magnet mounting holes 101a and fixed by epoxy resin potting. The plurality of permanent magnets 10 are respectively evenly distributed along the circumferential direction with the axis of the rotor shaft 31 as the center and form a circle of magnetic ring belts, and the circle where the outermost point of the impeller 5 blade contour is located faces the magnetic ring belt. The function of the permanent magnet is to absorb foreign matter such as iron powder and iron filings in the cooling water to avoid contaminating the bearings and effectively extend the service life of the bearings.

[0027] The inner ring of the tail end of the rotor shaft 31 is provided with a stepped hole connected to the rotor shaft through hole 31a. The stainless steel sleeve 15 and the MR magnet 13 sleeved on the stainless steel sleeve 15 are installed in sequence in the stepped hole. The stainless steel sleeve 15, the MR magnet 13 and the tail end of the rotor shaft 31 are provided with a stainless steel cover 16 by laser welding to protect the MR magnet 15 from falling and avoid water scouring and contamination of the magnet. Figure 6 As shown, the N and S poles of the MR magnet 13 are radially magnetized.

[0028] The motor housing 1 includes a coil housing body 101 and a control board end cover 102 fixed to the rear side of the coil housing body 101. A magnetic sensor 14 for detecting the magnetic field of the MR magnet 13 is provided on the outer surface of the control board end cover 102. The high-speed rotation of the rotor shaft drives the MR magnet to rotate at a high speed. The magnetic sensor (speed) is installed on the control board end cover, which can detect the magnetic field of the high-speed rotating MR magnet and convert the detection signal into speed data, which is fed back to the control board for real-time speed monitoring.

[0029] like Figure 3 , 4 As shown, the insulating sleeve 6 is made of PBT+GF30 glass fiber engineering plastic injection molding, and has the advantages of high strength, good heat aging resistance, and excellent insulation performance. The outer ring of the insulating sleeve 6 is provided with a plurality of semicircular arc reinforcing ribs 6a that are evenly distributed and extend in the axial direction, which can enhance the strength of the insulating sleeve itself. The inner ring of the stator 2 has a plurality of gap grooves 2a that are evenly distributed and extend in the axial direction, and each of the semicircular arc reinforcing ribs 6a is clamped in the corresponding gap groove 2a, which can prevent the insulating sleeve itself from rotating radially.

[0030] The output side and the tail side of the insulating isolation sleeve 6 are sealed with a first O-ring 17 and a second O-ring 18 respectively. The first O-ring 17 is sleeved on the insulating isolation sleeve 6 and clamped on the output side of the motor housing 1. A conical surface is provided on the inner side of the tail end of the insulating isolation sleeve 6 and the second O-ring 18 is pressed onto the control board end cover 102 through the conical surface, which can effectively prevent axial movement of the insulating isolation sleeve, is easy to install, and has excellent anti-leakage effect.

[0031] like Figure 5 As shown, the control panel end cover 102 has a shaft mounting hole in the middle, and the inner wall of the shaft mounting hole is provided with a plurality of evenly distributed notches 102a extending in the axial direction, and is also provided with an annular groove 102b connecting all the notches 102a, and a damping rubber ring 19 is filled in the annular groove 102b and the notch 102a, and the damping rubber ring 19 is tightly sleeved on the outer ring of the rear bearing 8, and the damping rubber ring prevents the outer ring of the bearing from rotating. The damping rubber ring made of silicone rubber can be easily installed in the control panel end cover. The positions of the annular groove and the notch just match the damping rubber ring, and the damping rubber ring will not rotate radially. After the damping rubber ring is installed, the inner ring size is slightly smaller than the outer diameter size of the rear bearing, and the outer ring of the rear bearing needs to apply a certain force to be installed in the inner ring of the damping rubber ring, so that the damping rubber ring can hold the outer ring of the rear bearing tightly, thereby ensuring that the outer ring of the rear bearing and the control panel end cover are relatively stationary (that is, it will not rotate with the inner ring of the rear bearing).

[0032] The rotor shaft 31 is made of stainless steel SUSU304, which has good corrosion resistance and heat resistance. The front bearing 7 and the rear bearing 8 are both open ceramic ball bearings.

[0033] When the impeller rotates at high speed, water, such as Figure 1 As shown by the hollow arrows, the cooling water flows in from the water inlet of the water pump housing, passes through the gap between the permanent magnet and the impeller for filtering, and then flows through the front bearing gap hole, the rotor cavity, the rear bearing gap hole, the rotor shaft through hole, and finally flows out from the gland through hole. The cooling water keeps circulating in this way, and continuously cools and lubricates the front and rear bearings, which not only reduces the noise of the front and rear bearings at high speed, but also prolongs their service life.

[0034] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. An electronic water pump with a relatively long service life, comprising a motor housing (1), a stator (2) disposed in the motor housing (1), a rotor (3) having a rotor shaft (31), a water pump housing (4) fixed to one side of the motor housing (1) and forming a water pump chamber, and an impeller (5) located in the water pump chamber, characterized in that: The motor housing (1) further comprises an insulating isolation sleeve (6) which is arranged in the motor housing (1) to separate the motor housing (1) into a stator cavity and a rotor cavity, the stator cavity being a sealed cavity, the stator (2) being located in the stator cavity, the rotor (3) being located in the rotor cavity, the output portion and the tail portion of the rotor shaft (31) being rotatably connected to the motor housing (1) via a front bearing (7) and a rear bearing (8) respectively, the impeller (5) being fixed to the output end portion of the rotor shaft (31), and the rotor shaft (31) being rotatably connected to the motor housing (1) via a front bearing (7) and a rear bearing (8) respectively. A rotor shaft through hole (31a) is provided in the direction of the center line, a front bearing clearance hole for connecting the water pump cavity with the rotor cavity is provided on the front bearing (7), a rear bearing clearance hole for connecting the rotor cavity with the rotor shaft through hole is provided on the rear bearing (8), an impeller gland (9) for positioning the impeller (5) is also fixed to the output end of the rotor shaft (31), the impeller gland (9) having a hollow gland cavity, and the impeller gland (9) also having a plurality of glands for positioning the impeller A gland through hole (9a) communicating with the water pump cavity, the center lines of the plurality of gland through holes (9a) being inclined toward the impeller (5) and intersecting with the axis of the impeller gland (9) at the same point, a plurality of permanent magnet mounting holes (101a) being arranged on the output side end surface of the motor housing (1), a plurality of permanent magnets (10) being respectively mounted in corresponding permanent magnet mounting holes (101a) and fixed by epoxy resin encapsulation, and the plurality of permanent magnets (10) being respectively arranged along the rotor A magnetic ring band is evenly distributed in the circumferential direction with the axis of the shaft (31) as the center, and the circle where the outermost point of the blade profile of the impeller (5) is located faces the magnetic ring band. An MR magnetic steel (13) is fixed to the tail end of the rotor shaft (31). The motor housing (1) comprises a ring housing body (101) and a control board end cover (102) fixed to the tail side of the ring housing body (101). A magnetic sensor (14) for detecting the magnetic field of the MR magnetic steel (13) is arranged on the outer surface of the control board end cover (102).

2. The electronic water pump with a longer service life according to claim 1, characterized in that: The inner ring of the tail end of the rotor shaft (31) is provided with a stepped expanded hole connected to the rotor shaft through hole (31a); a stainless steel sleeve (15) and the MR magnetic steel (13) sleeved on the stainless steel sleeve (15) are sequentially installed in the stepped expanded hole; a stainless steel cover (16) is provided on the stainless steel sleeve (15), the MR magnetic steel (13) and the tail end of the rotor shaft (31) by laser welding; the N and S poles of the MR magnetic steel (13) are radially magnetized.

3. The electronic water pump with a longer service life according to claim 1, characterized in that: The insulating isolation sleeve (6) is made of glass fiber engineering plastic injection molding, and a plurality of semicircular arc reinforcing ribs (6a) are arranged on the outer ring of the insulating isolation sleeve (6), and the inner ring of the stator (2) has a plurality of gap grooves (2a) that are evenly distributed and extend along the axial direction, and each of the semicircular arc reinforcing ribs (6a) is clamped in a corresponding gap groove (2a).

4. The electronic water pump with a longer service life according to claim 3, characterized in that: The output side and the tail side of the insulating isolation sleeve (6) are sealed by a first O-ring (17) and a second O-ring (18) respectively; the first O-ring (17) is sleeved on the insulating isolation sleeve (6) and clamped on the output side of the motor housing (1); a conical surface is provided on the inner side of the tail end of the insulating isolation sleeve (6) and the second O-ring (18) is pressed onto the control board end cover (102) through the conical surface.

5. The electronic water pump with a longer service life according to claim 1, characterized in that: The control panel end cover (102) has a shaft mounting hole in the middle, a plurality of evenly distributed notches (102a) extending in the axial direction are formed on the inner wall of the shaft mounting hole, and an annular groove (102b) connecting all the notches (102a) is formed, a damping rubber ring (19) is filled in the annular groove (102b) and the notches (102a), and the damping rubber ring (19) is tightly sleeved on the outer ring of the rear bearing (8).

6. The electronic water pump with a longer service life according to claim 1, characterized in that: The rotor shaft (31) is made of stainless steel SUSU304, and the front bearing (7) and the rear bearing (8) are both open ceramic ball bearings.

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