CN215672737U - Electronic water pump with stable operation and long service life - Google Patents

Abstract

The utility model discloses an electronic water pump with stable operation and long service life, which comprises a motor shell, a stator, a rotor with a rotor shaft, a water pump shell, an impeller and an insulating isolation sleeve, wherein the rotor cavity is sequentially divided into a rotor iron core cavity, a bearing cavity and a rotating shaft cavity from an output port to the bottom, the tail part of the rotor shaft is press-fitted with an inner ring of a rear bearing in an interference manner, an outer ring of the rear bearing is press-fitted with the inner wall of the bearing cavity in an interference manner, the inner wall of the bearing cavity is also embedded with at least one tensioning rubber part which radially protrudes towards the axis, friction is further increased through the tensioning rubber part, even if thermal expansion and cold contraction occur due to high temperature, the outer ring of the rear bearing can still be tightly matched with the inner wall of the bearing cavity through the tensioning rubber part, the following rotation of the outer ring of the rear bearing along with the rotor is effectively prevented, and noise abnormal sound and overhigh temperature caused by the friction of the outer ring of the rear bearing relative to the inner wall of the bearing cavity are avoided, thereby effectively ensuring the service life and the performance of the whole water pump.

Description

Electronic water pump with stable operation and long service life

Technical Field

The utility model relates to an electronic water pump with stable operation and long service life.

Background

In the prior art, an electronic water pump structure is easy to overheat and burn when rotating at a high speed. Most of the existing water pumps adopt a sealing shaft, a motor part of the structure of the existing water pump mainly comprises a stator, a rotor, a bearing and other parts, and a water pump part mainly comprises an impeller and a pump body with a water inlet and a water outlet. However, friction generated by high-speed rotation of the rotor in the working process of the electronic water pump structure can cause the motor to generate heat, and improper treatment of high temperature can affect the service life and performance of the whole water pump.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide an electronic water pump which is stable in operation and long in service life.

In order to solve the technical problems, the utility model adopts the technical scheme that: an electronic water pump with long operation stable life comprises a motor shell, a stator arranged in the motor shell, a rotor with a rotor shaft, a water pump shell fixed on one side of the motor shell and forming a water pump cavity, an impeller positioned in the water pump cavity, and an insulating isolation sleeve arranged in the motor shell and used for isolating the motor shell into a stator cavity and a rotor cavity, wherein the stator cavity is a sealed cavity, the stator is positioned in the stator cavity, the rotor is positioned in the rotor cavity, the tail part of the insulating isolation sleeve is provided with a sleeve bottom, and the sleeve bottom is provided with two steps with diameters which are sequentially reduced, so that the rotor cavity is sequentially divided into a rotor core cavity, a bearing cavity and a rotating shaft cavity from an output port to the bottom, a rotor core is positioned in the rotor core cavity, and the tail part of the rotor shaft is press-fitted with an inner ring of a rear bearing in an interference manner, the rear bearing is located in the bearing cavity, the outer ring of the rear bearing and the inner wall of the bearing cavity are pressed in an interference mode, at least one radial tensioning rubber piece protruding towards the axis is further embedded in the inner wall of the bearing cavity, the tensioning rubber piece is tightly pressed on the outer ring of the rear bearing, and the tail end of the rotor shaft is located in the rotating shaft cavity.

In some embodiments, the tensioning rubber member is a silicone rubber rod made of silicone rubber, and includes a silicone rubber rod body, a boss, and a connecting neck connected between the boss and the silicone rubber rod body, a semicircular groove is formed on the inner wall of the bearing cavity along a direction parallel to the rotor shaft, a through hole facing the semicircular groove is penetratingly formed on the sleeve bottom, the silicone rubber rod body is inserted into the semicircular groove, the connecting neck is inserted into the through hole, and the boss is hooked at an outer opening of the through hole.

In some embodiments, the boss is also provided axially with a pulling end for pulling through the hole when installed.

In some embodiments, the inner wall of the bearing cavity is provided with a plurality of fan-shaped grooves, and the fan-shaped grooves are uniformly distributed along the circumferential direction of the inner wall of the bearing cavity.

In some embodiments, a shaft retaining ring for being clamped on the rotor shaft is provided between the rear bearing and the sleeve bottom.

In some embodiments, a front bearing is disposed between the output portion of the rotor shaft and the motor housing, the impeller is fixed to the output end portion of the rotor shaft, the rotor shaft is provided with a penetrating rotor shaft through hole along the axial lead direction, the front bearing is provided with a front bearing clearance hole for communicating the water pump chamber with the rotor chamber, and the rear bearing is provided with a rear bearing clearance hole for communicating the rotor chamber with the rotor shaft through hole.

In some embodiments, an impeller gland for positioning the impeller is further fixed to the output end of the rotor shaft, the impeller gland has a hollow gland cavity, the impeller gland further has a plurality of gland through holes for communicating the gland cavity with the water pump cavity, and center lines of the plurality of gland through holes are respectively inclined toward the impeller direction and intersect with an axial line of the impeller gland at the same point.

In some embodiments, MR magnetic steel is fixed at the tail end of the rotor shaft, a step counterbore communicated with the through hole of the rotor shaft is formed in the inner ring of the tail end of the rotor shaft, a stainless steel sleeve and the MR magnetic steel sleeved on the stainless steel sleeve are sequentially installed in the step counterbore, a stainless steel cover is arranged on the stainless steel sleeve, the MR magnetic steel and the tail end of the rotor shaft through a laser welding cover, N, S poles of the MR magnetic steel are magnetized in the radial direction, the motor housing comprises a housing main body and a drive circuit board end cover fixed at the tail side of the housing main body, and a hall sensor for detecting the magnetic field of the MR magnetic steel is arranged on the outer side surface of the drive circuit board end cover.

In some embodiments, the insulation isolation sleeve is formed by injection molding of glass fiber engineering plastics, the output side part of the insulation isolation sleeve is sealed by an O-shaped ring, a conical surface is arranged on the inner side of the opening end part of the insulation isolation sleeve, and the O-shaped ring is pressed on the front cover of the motor shell through the conical surface.

The scope of the present invention is not limited to the specific combinations of the above-described features, and other embodiments in which the above-described features or their equivalents are arbitrarily combined are also intended to be encompassed. For example, the above features and the technical features (but not limited to) having similar functions disclosed in the present application are mutually replaced to form the technical solution.

Due to the application of the technical scheme, compared with the prior art, the utility model has the following advantages: the utility model provides an electronic water pump with stable operation and long service life, wherein the tail part of a rotor shaft is provided with an inner ring of a rear bearing in an interference press fit mode, the outer ring of the rear bearing is in interference press fit with the inner wall of a bearing cavity, friction is further increased through a tensioning rubber piece, even if expansion and contraction occur due to high temperature, the outer ring of the rear bearing can still be tightly matched with the inner wall of the bearing cavity through the tensioning rubber piece, the outer ring of the rear bearing is effectively prevented from following the rotor, noise abnormal sound and overhigh temperature caused by the friction of the outer ring of the rear bearing relative to the inner wall of the bearing cavity are avoided, and the service life and the performance of the whole water pump are effectively ensured.

Drawings

FIG. 1 is a cross-sectional view of an electronic water pump with a long operational stability life;

FIG. 2 is a side view of an insulating spacer sleeve;

FIG. 3 is a cross-sectional view of an insulating spacer sleeve;

FIG. 4 is a plan view of the insulating spacer;

FIG. 5 is a side view of the tension rubber;

FIG. 6 is an elevational view of the tension rubber member;

wherein 1, motor shell; 101. a ring housing main body; 102. a drive circuit board end cover; 2. a stator; 3. a rotor; 31. a rotor shaft; 31a, a rotor shaft through hole; 311. a retainer ring for a shaft; 32. a rotor core; 4. a water pump housing; 5. an impeller; 51. an impeller gland; 51a, a gland through hole; 6. an insulating spacer sleeve; 61. sleeving a bottom; 61a, a through hole; 611. a rotor core cavity; 612. a bearing cavity; 612a, a semicircular groove; 612b, a fan-shaped groove; 613; a rotating shaft cavity; 7. a rear bearing; 71. a rear bearing inner race; 72. a rear bearing outer race; 8. a front bearing; 9. tensioning the rubber member; 91. a silicone rubber rod body; 92. a boss; 93. a connecting neck; 94. a pulling end; 11. MR magnetic steel; 12. a stainless steel sleeve; 13. a stainless steel cover; 14. and an O-shaped ring.

Detailed Description

The following are specific examples of the present invention and are further described with reference to the drawings, but the present invention is not limited to these examples.

As shown in fig. 1, an electronic water pump with stable operation and long service life includes 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, an impeller 5 located in the water pump chamber, and an insulating spacer 6 disposed in the motor housing 1 and dividing the motor housing into a stator chamber and a rotor chamber, wherein the stator chamber is a sealed chamber, the stator 2 is located in the stator chamber, and the rotor 3 is located in the rotor chamber.

The impeller 5 is fixed at an output end of the rotor shaft 31, an output part and a tail part of the rotor shaft 31 are rotatably connected to the motor housing 1 through a front bearing 8 and a rear bearing 7 respectively, the rotor shaft 31 is provided with a penetrating rotor shaft through hole 31a along an axial lead direction, the front bearing 8 is provided with a front bearing clearance hole for communicating the water pump cavity with the rotor cavity, and the rear bearing 7 is provided with a rear bearing clearance hole for communicating the rotor cavity with the rotor shaft through hole 31 a. The clearance hole may be provided in the ball retainer, may be provided directly in the ball, or may be directly a clearance between the bearing components. The rotor shaft 31 is made of stainless steel SUS304, and has good corrosion resistance and heat resistance. The front bearing 8 and the rear bearing 7 are both open ceramic ball bearings, and the ball clearance in the bearings is favorable for the circulation of cooling liquid and is used for lubricating and radiating the bearings.

The output end of the rotor shaft 31 is further fixed with an impeller gland 51 for positioning the impeller 5, the impeller gland 51 is provided with a hollow gland cavity, the impeller gland 51 is further provided with a plurality of gland through holes 51a for communicating the gland cavity with the water pump cavity, and the center lines of the gland through holes 51a are respectively inclined towards the impeller 5 and intersect with the axis line of the impeller gland 51 at the same point.

The insulating isolation sleeve 6 is formed by injection molding of PA66+ GF30 glass fiber engineering plastics and has the advantages of high strength and magnetic conductivity.

As shown in fig. 2 and 3, the insulating spacer 6 has a sleeve bottom 61 at the tail, and the sleeve bottom 61 is provided with two steps with successively decreasing diameters, so that the rotor cavity is sequentially divided into a rotor core cavity 611, a bearing cavity 612, and a rotating shaft cavity 613 from the output port to the bottom, the rotor core 32 is located in the rotor core cavity 611, a shaft retainer ring 311 for being clamped on the rotor shaft 31 is provided between the rear bearing 7 and the sleeve bottom 61, the tail of the rotor shaft 31 is press-fitted with an inner ring 71 of the rear bearing in an interference manner, the rear bearing 7 is located in the bearing cavity 612, the inner wall of the bearing cavity 612 is provided with a plurality of fan-shaped grooves 612b, the plurality of fan-shaped grooves 612b are uniformly distributed along the circumferential direction of the inner wall of the bearing cavity 612, the outer ring 72 of the rear bearing is press-fitted with the inner wall of the bearing cavity 612 in an interference manner, the fan-shaped grooves serve to press-fit the outer ring 72 of the rear bearing with the inner wall of the bearing cavity, the insulating isolation sleeve is prevented from being expanded and cracked, and meanwhile, the insulating isolation sleeve is used for circulating cooling liquid.

As shown in fig. 5, in this embodiment, a tension rubber member 9 protruding radially toward the axis is further embedded in the inner wall of the bearing cavity 612, the tension rubber member 9 is pressed against the outer ring 72 of the rear bearing, and the rear end portion of the rotor shaft 31 is located in the rotating shaft cavity 613. The tensioning rubber part 9 is a silicone rubber rod made of silicone rubber, and comprises a silicone rubber rod body 91, a boss 92 and a connecting neck 93 connected between the boss 92 and the silicone rubber rod body 91, a semicircular groove 612a is formed in the inner wall of the bearing cavity 612 along a direction parallel to the rotor shaft 31, as shown in fig. 4, a through hole 61a facing the semicircular groove 612a is formed in the sleeve bottom 61 in a penetrating manner, the silicone rubber rod body 91 is inserted into the semicircular groove 612a, the connecting neck 93 is inserted into the through hole 61a, and the boss 92 is hooked at an outer opening of the through hole 61 a. The boss 92 is also provided axially with a pulling end 94 for pulling through the hole during installation.

The temperature of the cooling liquid in the electronic water pump can reach 90 ℃, the inner wall of the bearing cavity of the insulating isolation sleeve can be thermally expanded at high temperature, the inner ring of the rear bearing and the rotor shaft rotate at high speed, and the outer ring of the rear bearing can rotate with the rotor shaft. The tensioning rubber piece is arranged to prevent the outer ring of the rear bearing from rotating, the silicon rubber rod is soft and high-temperature resistant, and the installation method is as follows: the pulling end of the silicone rubber rod is plugged into the semicircular groove and penetrates through the through hole all the time, the pulling end of the silicone rubber rod is pulled until the boss is pulled out, the boss is hooked at an outer opening of the through hole, and the pulling end can be cut off at last, namely, the inner part of a dotted line frame of figure 6 is plugged beside a rear bearing outer ring and is extruded and deformed, so that the rear bearing outer ring can be prevented from rotating along with the rotation, and the silicone rubber rod is plugged into the through hole and plays a role in sealing cooling liquid.

The output side part of the insulating spacer sleeve 6 is an opening end part of a rotor cavity, the opening end part is arranged in a sealing mode with a front cover of the motor shell 1 by adopting an O-shaped ring 14, the inner side of the opening end part of the insulating spacer sleeve 6 is provided with a conical surface, and the O-shaped ring 14 is pressed on the front cover of the motor shell 1 through the conical surface. The sealing is realized through the O-shaped ring, the leakage is prevented from reaching the stator cavity, and the effect is superior.

As shown in fig. 1, MR magnetic steel 11 is fixed at the tail end of the rotor shaft 31, a step counterbore communicated with the through hole 31a of the rotor shaft is formed in the inner ring of the tail end of the rotor shaft 31, a stainless steel sleeve 12 and the MR magnetic steel 11 sleeved on the stainless steel sleeve 12 are sequentially installed in the step counterbore, a stainless steel cover 13 is arranged on the tail end of the stainless steel sleeve 12, the MR magnetic steel 11 and the rotor shaft 31 through a laser welding cover, N, S poles of the MR magnetic steel 11 are magnetized in the radial direction, the motor housing 1 comprises a housing main body 101 and a drive circuit board end cover 102 fixed at the tail side of the housing main body 101, and a hall sensor for detecting the MR magnetic steel field is arranged on the outer side surface of the drive circuit board end cover 102. The high-speed rotation of rotor shaft drives the high-speed rotation of MR magnet steel, install on drive circuit board end cover hall sensor (rotational speed), the magnetic field of the high-speed rotatory MR magnet steel of detectable, and convert detected signal into rotational speed data, feed back to drive circuit board, carry out real-time rotational speed monitoring, aforementioned tensioning rubber spare has not only played the friction of the inner wall of increase back bearing inner race and bearing chamber, thereby prevent the effect that back bearing inner race follows the commentaries on classics along with the rotor, and help hall sensor to detect the MR magnet steel magnetic field sensitively, its structural design itself also can effectively play the sealed effect of water proof.

The insulating isolation sleeve is a device for shielding cooling liquid, adopts non-metallic materials, can separate the cooling liquid from a channel of the motor and the driving circuit board, achieves the insulating purpose, can be magnetized to facilitate the rotation angle of the MR magnet arranged at the end part of the Hall sensor induction shaft arranged on the driving circuit board, and feeds back and controls the rotation speed of the water pump in real time.

The rear bearing is characterized in that the inner ring of the rear bearing is arranged on the tail of the rotor shaft in an interference press fit mode, the outer ring of the rear bearing is in interference press fit with the inner wall of the bearing cavity, friction is further increased through the tensioning rubber piece, even if expansion caused by heat and contraction caused by cold occur due to high temperature, the outer ring of the rear bearing can still be enabled to be tightly matched with the inner wall of the bearing cavity through the tensioning rubber piece, the outer ring of the rear bearing is effectively prevented from rotating along with the rotor, the outer ring of the rear bearing is prevented from being opposite to noise abnormal sound and overhigh temperature caused by friction of the inner wall of the bearing cavity, and therefore the service life and the performance of the whole water pump are effectively guaranteed.

When the impeller rotates at a high speed, cooling liquid flows in from a water inlet source of the water pump shell, and pressurized cooling liquid flows through a gap at the back of the impeller, sequentially flows through the front bearing clearance hole, the rotor cavity, the rear bearing clearance hole and the rotor shaft through hole, and finally flows out from the gland through hole. The cooling liquid continuously cools and lubricates the front bearing and the rear bearing through the circulating flow, so that the noise of the high-speed operation of the front bearing and the rear bearing is reduced, the operation temperature is greatly reduced, and the service life of the front bearing and the rear bearing is prolonged.

The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims (9)

1. An electronic water pump with long operation stable life comprises a motor shell (1), a stator (2) arranged in the motor shell (1), a rotor (3) with a rotor shaft (31), a water pump shell (4) fixed on one side of the motor shell (1) and forming a water pump cavity, and an impeller (5) positioned in the water pump cavity, and is characterized in that: the motor is characterized by further comprising an insulating isolation sleeve (6) which is arranged in the motor shell (1) and divides the motor shell into a stator cavity and a rotor cavity, the stator cavity is a sealed cavity, the stator (2) is positioned in the stator cavity, the rotor (3) is positioned in the rotor cavity, the tail of the insulating isolation sleeve (6) is provided with a sleeve bottom (61), and the sleeve bottom (61) is provided with two steps with successively reduced diameters, so that the rotor cavity is sequentially divided into a rotor iron core cavity (611), a bearing cavity (612) and a rotating shaft cavity (613) from an output port to the bottom, a rotor iron core (32) is positioned in the rotor iron core cavity (611), the tail of the rotor shaft (31) is in interference fit with a rear bearing (71), the inner ring (7) of the rear bearing is positioned in the bearing cavity (612), and the outer ring (72) of the rear bearing is in interference fit with the inner wall of the bearing cavity (612), still inlay on the inner wall of bearing chamber (612) and be equipped with at least one radial convex tensioning rubber spare (9) towards the axle center, tensioning rubber spare (9) compress tightly on outer lane (72) of rear bearing, the trailing end of rotor shaft (31) is located in pivot chamber (613).

2. The electronic water pump of claim 1, wherein the electronic water pump has a stable operation and a long service life, and the electronic water pump further comprises: tensioning rubber spare (9) is the silicon rubber pole of making by the silicon rubber, including the silicon rubber body of rod (91), boss (92), connect boss (92) with connecting neck (93) between the silicon rubber body of rod (91), along being on a parallel with on the inner wall of bearing chamber (612) rotor shaft (31) direction is provided with semicircular groove (612 a), pierce through on cover end (61) and be provided with and face through-hole (61 a) of semicircular groove (612 a), the silicon rubber body of rod (91) is inserted and is established in semicircular groove (612 a), connecting neck (93) are inserted and are established in through-hole (61 a), boss (92) collude the outer opening portion of through-hole (61 a).

3. The electronic water pump of claim 2, wherein the electronic water pump has a stable operation and a long service life, and the electronic water pump further comprises: the lug boss (92) is also axially provided with a pulling end (94) used for perforation traction during installation.

4. The electronic water pump of claim 2, wherein the electronic water pump has a stable operation and a long service life, and the electronic water pump further comprises: the inner wall of the bearing cavity (612) is provided with a plurality of fan-shaped grooves (612 b), and the fan-shaped grooves (612 b) are uniformly distributed along the circumferential direction of the inner wall of the bearing cavity (612).

5. The electronic water pump with long operation stability and service life according to claim 4, wherein: and a shaft retainer ring (311) clamped on the rotor shaft (31) is arranged between the rear bearing (7) and the sleeve bottom (61).

6. The electronic water pump of claim 5, wherein the electronic water pump has a stable operation and a long service life, and the electronic water pump further comprises: a front bearing (8) is arranged between the output part of the rotor shaft (31) and the motor shell (1), the impeller (5) is fixed at the output end part of the rotor shaft (31), a penetrating rotor shaft through hole (31 a) is formed in the rotor shaft (31) along the axial lead direction, a front bearing clearance hole used for communicating the water pump cavity with the rotor cavity is formed in the front bearing (8), and a rear bearing clearance hole used for communicating the rotor cavity with the rotor shaft through hole (31 a) is formed in the rear bearing (7).

7. The electronic water pump of claim 6, wherein the electronic water pump has a stable operation and a long service life, and the electronic water pump further comprises: the output end of rotor shaft (31) still is fixed with and is used for fixing a position impeller gland (51) of impeller (5), impeller gland (51) have hollow gland chamber, impeller gland (51) still have a plurality of be used for with the gland chamber with gland through-hole (51 a) that the water pump chamber is linked together, it is a plurality of the central line of gland through-hole (51 a) is respectively towards impeller (5) direction slope and with the axial lead of impeller gland (51) intersects in the same point.

8. The electronic water pump of claim 6, wherein the electronic water pump has a stable operation and a long service life, and the electronic water pump further comprises: the magnetic resonance motor is characterized in that MR magnetic steel (11) is fixed at the tail end of the rotor shaft (31), a step reaming communicated with the through hole (31 a) of the rotor shaft is formed in the inner ring of the tail end of the rotor shaft (31), a stainless steel sleeve (12) is sequentially installed in the step reaming, the MR magnetic steel (11) sleeved on the stainless steel sleeve (12), a stainless steel cover (13) is arranged on the tail end of the rotor shaft (31) and the MR magnetic steel (12) in a laser welding mode, N, S poles of the MR magnetic steel (11) are radially magnetized, the motor shell (1) comprises a shell main body (101) and a drive circuit board end cover (102) fixed on the tail side of the shell main body (101), and a Hall sensor used for detecting the MR magnetic steel is arranged on the outer side face of the drive circuit board end cover (102).

9. The electronic water pump of claim 1, wherein the electronic water pump has a stable operation and a long service life, and the electronic water pump further comprises: insulating spacer sleeve (6) are moulded plastics by glass fiber engineering plastics and are formed, the output lateral part of insulating spacer sleeve (6) adopts O type circle (14) to seal, insulating spacer sleeve (6) opening end inboard is provided with the conical surface and passes through the conical surface will O type circle (14) compress tightly on the protecgulum of motor casing (1).

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