Rotor assembly and electronic water pump using the same

Abstract

The present invention discloses a rotor assembly and an electronic water pump using the same, and relates to the technical field of electronic water pumps and their components. The rotor assembly at least includes a rotor support, a shaft sleeve, and a magnetic ring. The shaft sleeve is inserted into the rotor support, and the magnetic ring is sleeved outside the rotor support. The rotor support is formed with a plurality of guide channels and a plurality of discharge channels axially extending through the rotor support. The liquid in the pump chamber structure can pass through the guide channels from the top of the rotor support to the bottom of the rotor support, and the liquid in the pump chamber structure can pass through the discharge channels from the bottom of the rotor support to the bottom of the rotor support. The present invention mainly solves the problem of how to prevent impurities carried by the liquid from accumulating at the bottom of the rotor assembly. The present invention effectively avoids the problem of impurities accumulating at the bottom of the rotor support, thereby avoiding the generation of scale / colloid at the above-mentioned location, and improving the performance, stability, heat dissipation effect, and service life of the electronic water pump.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic water pumps and parts thereof, in particular to a rotor assembly and an electronic water pump using the same. Background Art

[0002] A water pump is a mechanical device that can drive the flow of liquid, making the liquid flow from one place to another in a certain direction.

[0003] Electronic water pumps are an important type of water pump, in which the rotor assembly is one of the core components of the electronic water pump. In the prior art, the rotor assembly of an electronic water pump usually integrates a magnetic ring and an impeller on a rotor bracket. The magnetic ring can rotate in the rotating magnetic field generated by the stator assembly of the electronic water pump, thereby driving the entire rotor bracket and impeller to rotate. The rotating impeller can drive the liquid to flow, thereby realizing the basic function of the water pump. The Chinese invention patent with announcement number CN220470281U and the name "Rotor Assembly and Electronic Water Pump Using the Same" discloses a typical rotor assembly structure.

[0004] The liquid driven by the electronic water pump may bring some impurities when it flows. After long-term use, the impurities will accumulate at the bottom of the rotor assembly, forming scale or colloid, affecting the performance of the rotor assembly, and may even block the pump cavity of the electronic water pump or cause the rotor assembly to start, causing the electronic water pump to malfunction.

[0005] In summary, how to prevent impurities carried by the liquid from accumulating at the bottom of the rotor assembly has become an urgent problem to be solved. Summary of the Invention

[0006] An object of the present invention is to provide a rotor assembly and an electronic water pump using the same, which can effectively prevent impurities carried by liquid from accumulating at the bottom of the rotor assembly.

[0007] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a rotor assembly, applied to the pump chamber structure of an electronic water pump; the rotor assembly comprises at least a rotor support, a shaft sleeve and a magnetic ring, the shaft sleeve is arranged in the rotor support, and the magnetic ring is arranged outside the rotor support; the rotor support is respectively formed with a plurality of guide channels and a plurality of discharge channels axially penetrating the rotor support; the liquid in the pump chamber structure can pass from the top of the rotor support through the guide channels to the bottom of the rotor support, and the liquid in the pump chamber structure can pass from the bottom of the rotor support through the discharge channels to the top of the rotor support.

[0008] In the above technical solution, the rotor bracket is integrated with the shaft sleeve and the magnetic ring by integral injection molding, so that the shaft sleeve is inserted into the rotor bracket and the magnetic ring is sleeved outside the rotor bracket.

[0009] In the above technical solution, the rotor assembly of the present invention further includes an impeller; one end of the rotor bracket expands in the radial direction to form an impeller mounting platform; the impeller is fixed to the impeller mounting platform of the rotor bracket by ultrasonic welding.

[0010] In the above technical solution, the body of the rotor bracket is formed with a sleeve mating surface and a magnetic ring mating surface in sequence from the inside to the outside along its radial direction; the outer ring surface of the sleeve is tightly fitted with the sleeve mating surface of the rotor bracket; and the inner ring surface of the magnetic ring is tightly fitted with the magnetic ring mating surface of the rotor bracket.

[0011] In the above technical solution, the outlet end of the guide channel is located at the magnetic ring mating surface of the rotor bracket, and the inlet end of the discharge channel is located at the shaft sleeve mating surface of the rotor bracket.

[0012] In the above technical solution, the sleeve mating surface between the sleeve and the rotor bracket and the magnetic ring mating surface between the magnetic ring and the rotor bracket are offset in the axial direction; or, the axial length of the sleeve mating surface between the sleeve and the rotor bracket is shorter than the axial length of the magnetic ring mating surface between the magnetic ring and the rotor bracket; so that the horizontal height of the magnetic ring mating surface between the magnetic ring and the rotor bracket is lower than the horizontal height of the sleeve mating surface between the sleeve and the rotor bracket; thereby, the horizontal height of the outlet end of the guide channel is lower than the horizontal height of the inlet end of the discharge channel.

[0013] In the above technical solution, the magnetic ring mating surface of the rotor bracket is set as a hollow structure at the guide channel and / or the discharge channel, so that the inner wall of the magnetic ring serves as part of the guide channel and / or the discharge channel.

[0014] In the above technical solution, the bottom end surface of the sleeve serves as a part of the discharge channel.

[0015] In the above technical solution, the top end surface of the rotor bracket is concave to form an axial avoidance groove; the inlet end of the guide channel and the outlet end of the discharge channel are both located at the bottom of the axial avoidance groove.

[0016] An electronic water pump, which includes the above-mentioned rotor assembly; it also includes a pump cover, a pump chamber structure shell, a stator-pump housing assembly, a drive circuit board, a rear end cover and a shaft core; after the pump cover and the pump chamber structure shell are fixedly combined with each other, they form a pump chamber structure; a water inlet and a water outlet communicating with the inside and outside of the pump chamber structure are respectively formed on the pump cover; one end of the shaft core is fixedly matched with the pump chamber structure shell, and the other end of the shaft core is fixedly matched with the pump cover to support the shaft core in the pump chamber structure; the shaft sleeve of the rotor assembly is sleeved on the shaft core and rotatably matched with the shaft core; the stator-pump housing assembly includes a pump housing and a stator assembly, and the pump housing is molded outside the stator assembly in an overmolding manner so that the stator assembly is buried in the pump housing; the pump cover, the pump chamber structure shell The pump housing and the pump housing of the stator-pump housing assembly are fixed in sequence along the axial direction, so that the stator component of the stator-pump housing assembly and the magnetic ring of the rotor component are aligned with each other in the radial direction; the drive circuit board is accommodated and fixed in the pump housing, and the end cover is fixed at one end of the pump housing and covers the opening of the pump housing; the drive circuit board is electrically connected to the stator component of the stator-pump housing assembly, so that the stator component can magnetically couple and drive the rotor component to rotate in the pump chamber structure with the shaft core as the axis; the liquid in the pump chamber structure can pass through the guide channel from the top of the rotor bracket to the bottom of the rotor bracket, and the liquid in the pump chamber structure can pass through the discharge channel from the bottom of the rotor bracket to the top of the rotor bracket.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: the rotor assembly of the present invention and the electronic water pump using the same, the liquid in the pump chamber structure can pass through the guide channel from the top of the rotor bracket to the bottom of the rotor bracket, and the liquid in the pump chamber structure can pass through the discharge channel from the bottom of the rotor bracket to the top of the rotor bracket, thereby increasing the path area for the liquid to pass through within a limited space. On the one hand, the flow rate of the liquid is increased, which can improve the discharge capacity of impurities and make it difficult for impurities to accumulate at the bottom of the rotor bracket and in the pump chamber structure. On the other hand, through the impact capacity of the liquid, the impurities at the bottom of the rotor bracket and in the pump chamber structure are lifted up and then pass through the discharge channel to reach the internal space of the pump cover and then discharged through the water outlet of the pump cover, effectively avoiding the problem of impurities accumulating at the bottom of the rotor bracket, thereby avoiding the generation of scale / colloid at the above-mentioned position, and improving the performance, stability, heat dissipation effect and service life of the electronic water pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional view of the rotor assembly in the present invention.

[0019] Figure 2 This is an exploded view of the rotor assembly of the present invention.

[0020] Figure 3 It is a cross-sectional view of the rotor assembly in the present invention.

[0021] Figure 4 This is a structural view of the rotor support in the present invention.

[0022] Figure 5 This is a three-dimensional view of the electronic water pump in the present invention.

[0023] Figure 6 This is an exploded view of the electronic water pump in the present invention.

[0024] Figure 7 It is a cross-sectional view of the electronic water pump in the present invention.

[0025] Figure 8 It is a cross-sectional view of the pump chamber structure in the present invention.

[0026] The figures are marked as follows: 1. rotor assembly; 11. rotor bracket; 111. guide channel; 112. discharge channel; 113. shaft sleeve mating surface; 114. magnetic ring mating surface; 115. impeller mounting platform; 116. axial avoidance groove; 12. shaft sleeve; 13. magnetic ring; 14. impeller; 2. shaft core; 3. pump cover; 31. shaft core seat; 32. water inlet; 33. water outlet; 4. pump chamber structure shell; 41. bottom plate; 5. stator-pump casing assembly; 51. pump casing; 52. stator assembly; 6. drive circuit board; 7. rear end cover; 10. pump chamber structure. DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0028] This embodiment provides a rotor assembly, which is applied in a pump chamber structure 10 of an electronic water pump and is used as a fluid power driving component of the electronic water pump.

[0029] See also Figures 1-4The rotor assembly 1 at least includes a rotor bracket 11, a sleeve 12 and a magnetic ring 13; wherein the rotor bracket 11 is an integrally injection-molded annular bracket for providing an overall support base for the rotor assembly 1; the sleeve 12 is specifically a sintered sleeve 12, i.e., a ceramic material, which has self-lubricating properties; the magnetic ring 13 is a metal ring with magnetism, which can be magnetically coupled with the stator assembly 52 to drive the rotor assembly 1 to rotate; the sleeve 12 is inserted into the rotor bracket 11, and the magnetic ring 13 is sleeved on the rotor bracket 11, specifically, the rotor bracket 11 is integrated with the shaft sleeve 12 and the magnetic ring 13 by integral injection molding, so that the shaft sleeve 12 is inserted into the rotor bracket 11, and the magnetic ring 13 is sleeved outside the rotor bracket 11; when manufacturing the rotor assembly 1 of this embodiment, the shaft sleeve 12 and the magnetic ring 13 are respectively placed in the mold of the rotor bracket 11, and the rotor bracket 11 is formed by integral injection molding. After the rotor bracket 11 is formed, it is integrated with the shaft sleeve 12 and the magnetic ring 13.

[0030] In order to prevent impurities carried by the liquid from accumulating at the bottom of the rotor assembly 1, the rotor bracket 11 is respectively provided with a plurality of guide channels 111 and a plurality of discharge channels 112 which axially penetrate the rotor bracket 11; in this embodiment, two guide channels 111 are provided and are opposite to each other on both sides of the rotor bracket 11, and two discharge channels 112 are also provided and are opposite to each other on both sides of the rotor bracket 11, that is, the guide channels 111 and the discharge channels 112 are circumferentially uniformly distributed at the rotor bracket 11 at an angle of 90°; in this embodiment, the guide channels 111 and the discharge channels 112 are both integrally injection molded with the rotor bracket 11; the liquid in the pump chamber structure 10 can pass through the guide channels 111 from the top of the rotor bracket 11 to the bottom of the rotor bracket 11, and the liquid in the pump chamber structure 10 can pass through the discharge channels 112 from the bottom of the rotor bracket 11 to the top of the rotor bracket 11.

[0031] Furthermore, the rotor assembly 1 of this embodiment also includes an impeller 14, which is an integrally injection-molded engineering plastic component with a plurality of blades for driving the liquid to flow during rotation; one end of the rotor bracket 11 expands in the radial direction to form an impeller mounting platform 115, which is a flat plate structure integrally molded with the rotor bracket 11, and its surface is provided with embedding grooves matching the blades on the impeller 14. The impeller 14 is fixed to the impeller mounting platform 115 of the rotor bracket 11 by ultrasonic welding, that is, the blades of the impeller 14 are correspondingly embedded in the embedding grooves of the impeller mounting platform 115, and the blades of the impeller 14 are welded to the embedding grooves of the impeller mounting platform 115 by ultrasonic welding, thereby achieving the fixation of the impeller 14 to the rotor bracket 11.

[0032] Specifically, the body of the rotor bracket 11 is formed with a sleeve mating surface 113 and a magnetic ring mating surface 114 in sequence from the inside to the outside along its radial direction. The outer ring surface of the sleeve 12 is tightly fitted with the sleeve mating surface 113 of the rotor bracket 11, and the inner ring surface of the magnetic ring 13 is tightly fitted with the magnetic ring mating surface 114 of the rotor bracket 11, so that the rotor bracket 11, the sleeve 12 and the magnetic ring 13 form an integrated structure; in fact, the sleeve mating surface 113 is the inner ring surface of the rotor bracket 11, and the magnetic ring mating surface 114 is the outer ring surface of the rotor bracket 11. The sleeve 12 and the magnetic ring 13 are respectively placed in the mold of the rotor bracket 11, and the rotor bracket 11 is formed by one-piece injection molding. After the rotor bracket 11 is formed, the characteristics of the sleeve mating surface 113 and the magnetic ring mating surface 114 are obtained.

[0033] Specifically, the outlet end of the guide channel 111 is located at the magnetic ring mating surface 114 of the rotor bracket 11 (specifically at the bottom of the magnetic ring mating surface 114), and the inlet end of the discharge channel 112 is located at the shaft sleeve mating surface 113 of the rotor bracket 11 (specifically at the bottom of the shaft sleeve mating surface 113).

[0034] See also Figure 3 Furthermore, the sleeve mating surface 113 between the sleeve 12 and the rotor bracket 11 and the magnetic ring mating surface 114 between the magnetic ring 13 and the rotor bracket 11 are staggered in the axial direction; or, the axial length of the sleeve mating surface 113 between the sleeve 12 and the rotor bracket 11 is shorter than the axial length of the magnetic ring mating surface 114 between the magnetic ring 13 and the rotor bracket 11; so that the horizontal height of the magnetic ring mating surface 114 (specifically the bottom) of the magnetic ring 13 and the rotor bracket 11 is lower than the horizontal height of the sleeve mating surface 113 (specifically the bottom) of the sleeve 12 (specifically the bottom) and the rotor bracket 11; thereby, the horizontal height of the outlet end of the guide channel 111 is lower than the horizontal height of the inlet end of the discharge channel 112.

[0035] In this embodiment, the shaft sleeve 12 and the shaft sleeve mating surface 113 of the rotor bracket 11, and the magnetic ring mating surface 114 of the magnetic ring 13 and the rotor bracket 11 are staggered in the axial direction. Specifically, the shaft sleeve 12 and the shaft sleeve mating surface 113 are arranged at a higher horizontal position, and the magnetic ring 13 and the magnetic ring mating surface 114 are arranged at a lower horizontal position; thereby, the horizontal height of the magnetic ring 13 and the magnetic ring mating surface 114 is lower than the horizontal height of the shaft sleeve 12 and the shaft sleeve mating surface 113; and further, the horizontal height of the outlet end of the guide channel 111 is lower than the horizontal height of the inlet end of the discharge channel 112.

[0036] The outlet end of the guide channel 111 is set at a low position, so that the liquid flows out at a low position, which can fully impact the entire bottom surface of the rotor assembly 1 and the bottom plate 41 of the pump chamber structure 10 of the electronic water pump, making it difficult for impurities to accumulate in the rotor assembly 1 and the pump chamber structure 10 of the electronic water pump; the inlet end of the discharge channel 112 is set at a high position, so that the raised impurities can fully enter the discharge channel 112 and then be discharged outside the pump chamber structure 10 of the electronic water pump.

[0037] Furthermore, the magnetic ring mating surface 114 of the rotor bracket 11 is set as a hollow structure at the guide channel 111 and / or the discharge channel 112, so that the inner wall of the magnetic ring 13 serves as a part of the guide channel 111 and / or the discharge channel 112; in this embodiment, the magnetic ring mating surface 114 of the rotor bracket 11 is set as a hollow structure at the guide channel 111 and the discharge channel 112, so that the inner wall of the magnetic ring 13 serves as both a part of the guide channel 111 and a part of the discharge channel 112; with this arrangement, the plastic material consumption of the rotor bracket 11 can be saved, the rigidity of the magnetic ring 13 can be fully utilized to improve the mechanical strength of the rotor bracket 11, and the rotor bracket 11 can be quickly formed, thereby improving the production efficiency of the electronic water pump.

[0038] Furthermore, the bottom end surface of the sleeve 12 serves as a part of the discharge channel 112 (specifically, the inlet end); with this arrangement, the liquid flowing out of the outlet end of the guide channel 111 can also flow near the bottom end surface of the sleeve 12 to flush out impurities attached to the bottom end surface of the sleeve 12, so that the impurities cannot accumulate at the bottom end surface of the sleeve 12.

[0039] Furthermore, the top end surface of the rotor bracket 11 is concave to form an axial avoidance groove 116. Specifically, the axial avoidance groove 116 is a circular concave structure, which is injection-molded as a whole with the rotor bracket 11 and is located in the center of the impeller mounting platform 115; the axial avoidance groove 116 can allow the shaft core seat 31 and the thrust washer at the pump cover 3 of the electronic water pump to pass through it (the shaft core seat 31 and the thrust washer need to pass through the central through hole of the impeller 14 first), so that the height of the electronic water pump is lower and the structure is more compact, but the shaft core seat 31 and the thrust washer do not contact the axial avoidance groove 116; the inlet end of the guide channel 111 and the outlet end of the discharge channel 112 are both located at the bottom of the axial avoidance groove 116.

[0040] This embodiment also provides an electronic water pump, which includes the above-mentioned rotor assembly 1.

[0041] See also Figure 5-Figure 8 The electronic water pump of this embodiment also includes a pump cover 3, a pump chamber structure shell 4, a stator-pump shell assembly 5, a drive circuit board 6, a rear end cover 7 and a shaft core 2.

[0042] Among them, the pump cover 3 is an integrally formed cover body of metal or engineering plastic material, the pump chamber structure shell 4 is an integrally formed thin shell component of engineering plastic material, which can allow the magnetic field to pass through; the driving circuit board 6 is a printed circuit board (PCB), which is equipped with a main control, a stator drive module and necessary peripheral circuits for driving the stator assembly 52 to operate; the rear end cover 7 is a metal cover plate, which is used as one of the shielding and protection structures of the electronic water pump; the shaft core 2 is an integrally formed metal shaft, such as stainless steel or aluminum alloy.

[0043] After the pump cover 3 and the pump chamber structure shell 4 are fixedly combined with each other, a pump chamber structure 10 is formed. Specifically, the pump chamber structure shell 4 and the pump cover 3 are combined into one by screws or snaps, and are sealed by a sealing ring, so that the inner cavity of the pump chamber structure shell 4 and the inner cavity of the pump cover 3 are enclosed to form the pump chamber structure 10; a water inlet 32 ​​and a water outlet 33 are respectively formed on the pump cover 3 to connect the inside and outside of the pump chamber structure 10. In fact, the water inlet 32 ​​and the water outlet 33 are both hard short tubes integrally formed on the pump cover 3.

[0044] One end of the shaft core 2 is fixedly matched with the pump chamber structure shell 4, and the other end of the shaft core 2 is fixedly matched with the pump cover 3 to support the shaft core 2 in the pump chamber structure 10; in this embodiment, one end of the shaft core 2 is buried in the bottom plate 41 of the pump chamber structure shell 4 by integral injection molding, and a shaft core seat 31 is also formed on the inner side of the pump cover 3. The shaft core seat 31 is also integrally molded on the pump cover 3 and is located on the inner side of the water inlet 32. The other end of the shaft core 2 is inserted into the shaft core seat 31 of the pump cover 3, thereby supporting the other end of the shaft core 2 by the shaft core seat 31 of the pump cover 3, thereby achieving the fixation of both ends of the shaft core 2.

[0045] The shaft sleeve 12 of the rotor assembly 1 is sleeved on the shaft core 2 and rotated together with the shaft core 2 , thereby supporting the rotor assembly 1 in the pump chamber structure 10 .

[0046] The stator-pump casing assembly 5 includes a pump casing 51 and a stator assembly 52, wherein the stator assembly 52 includes a stator core, an enameled wire coil wound on the stator core and distributed circumferentially, and a terminal plugged and fixed on the stator core and electrically connected to the end of the enameled wire coil; the pump casing 51 is molded outside the stator assembly 52 in an overmolding manner, so that the stator assembly 52 is buried in the pump casing 51. When manufacturing the stator-pump casing assembly 5, the stator assembly 52 is placed as a whole in the molding mold of the pump casing 51, and then plastic material is injected into the molding mold. After the plastic material is solidified, the pump casing 51 is formed. At this time, the stator assembly 52 and the pump casing 51 are molded as one body to constitute the stator-pump casing assembly 5.

[0047] The pump cover 3, the pump chamber structural shell 4 and the pump shell 51 of the stator-pump shell assembly 5 are fixed in sequence along the axial direction (specifically, fixed by screws), so that the stator component 52 of the stator-pump shell assembly 5 and the magnetic ring 13 of the rotor assembly 1 are aligned with each other in the radial direction. At this time, the magnetic ring 13 of the rotor assembly 1 is located in the inner ring of the stator component 52, and the two can achieve magnetic coupling. A sealing ring is provided between the pump chamber structural shell 4 and the stator-pump shell assembly 5 to enhance the sealing degree inside the stator-pump shell assembly 5; the drive circuit board 6 is accommodated and fixed in the pump shell 51 (specifically fixed by screws), and the end cover is fixed to one end of the pump shell 51 and covers the pump shell The stator-pump casing assembly 5 is fixed with an opening 51 (specifically, it is also fixed by screws), and a sealing ring is provided between the end cover and the stator-pump casing assembly 5 to enhance the sealing degree inside the stator-pump casing assembly 5; the driving circuit board 6 is electrically connected to the stator component 52 of the stator-pump casing assembly 5, so that the stator component 52 can be magnetically coupled to drive the rotor component 1 to rotate in the pump chamber structure 10 with the shaft core 2 as the axis. Specifically, the terminal of the stator component 52 is exposed to the pump casing 51 (but located in the inner space of the pump casing 51) and is welded to the driving circuit board 6, thereby realizing the electrical connection between the driving circuit board 6 and the stator component 52, so that the driving circuit board 6 can drive the stator component 52 to operate.

[0048] The liquid in the pump chamber structure 10 can pass through the guide channel 111 from the top of the rotor support 11 to the bottom of the rotor support 11, and the liquid in the pump chamber structure 10 can pass through the discharge channel 112 from the bottom of the rotor support 11 to the bottom of the rotor support 11.

[0049] When the electronic water pump of this embodiment is in use, the driving circuit board 6 is energized, and the coil of the stator assembly 52 is energized through the terminal, so that a rotating magnetic field is formed in the space of the inner ring of the stator assembly 52, thereby driving the entire rotor assembly 1 to rotate in the pump chamber structure 10 through magnetic coupling with the magnetic ring 13 of the rotor assembly 1; the rotating impeller 14 can drive the liquid to flow along its blades, and the water flows into the pump cover 3 from the water inlet 32 ​​and flows to the water outlet 33, thus realizing the basic function of the electronic water pump; in the above process, the entire pump chamber structure 10 is filled with liquid, and the liquid may carry impurities, because the liquid in the pump chamber structure 10 can be discharged from the rotor bracket 11 The top of the rotor bracket 11 passes through the guide channel 111 and reaches the bottom of the rotor bracket 11. Moreover, the liquid in the pump chamber structure 10 can pass through the discharge channel 112 from the bottom of the rotor bracket 11 to the top of the rotor bracket 11, thereby increasing the path area for the liquid to pass through within a limited space. On the one hand, the flow rate of the liquid is increased, which can improve the discharge capacity of impurities and make it difficult for impurities to accumulate at the bottom of the rotor bracket 11 and in the pump chamber structure 10. On the other hand, through the impact capacity of the liquid, the impurities at the bottom of the rotor bracket 11 and in the pump chamber structure 10 are lifted up and then pass through the discharge channel 112 to reach the internal space of the pump cover 3, and then are discharged through the water outlet 33 of the pump cover 3.

[0050] In the rotor assembly of this embodiment and the electronic water pump using the same, the liquid in the pump chamber structure 10 can pass through the guide channel 111 from the top of the rotor bracket 11 to the bottom of the rotor bracket 11, and the liquid in the pump chamber structure 10 can pass through the discharge channel 112 from the bottom of the rotor bracket 11 to the top of the rotor bracket 11, thereby increasing the path area for the liquid to pass through within a limited space. On the one hand, the flow rate of the liquid is increased, which can improve the discharge capacity of impurities and prevent impurities from accumulating at the bottom of the rotor bracket 11 and in the pump chamber structure 10. On the other hand, the impurities at the bottom of the rotor bracket 11 and in the pump chamber structure 10 are lifted up by the impact of the liquid and then pass through the discharge channel 112 to reach the internal space of the pump cover 3 and then be discharged through the water outlet 33 of the pump cover 3, effectively avoiding the problem of impurities accumulating at the bottom of the rotor bracket 11, thereby avoiding the formation of scale / colloid at the above-mentioned position, and improving the performance, stability, heat dissipation effect and service life of the electronic water pump.

[0051] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A rotor assembly, used in the pump cavity structure of an electronic water pump; The rotor assembly at least includes a rotor support, a shaft sleeve and a magnetic ring, wherein the shaft sleeve is inserted into the rotor support and the magnetic ring is sleeved outside the rotor support; It is characterized by: The rotor support is formed with a plurality of guide channels and a plurality of discharge channels axially penetrating the rotor support. The liquid in the pump chamber structure can flow from the top of the rotor support through the guide channel to the bottom of the rotor support, and the liquid in the pump chamber structure can flow from the bottom of the rotor support through the discharge channel to the top of the rotor support; The body of the rotor support is sequentially formed with a shaft sleeve mating surface and a magnetic ring mating surface from the inside to the outside along the radial direction thereof; The outer annular surface of the shaft sleeve is tightly fitted with the shaft sleeve matching surface of the rotor bracket; The inner ring surface of the magnetic ring is tightly fitted with the magnetic ring matching surface of the rotor bracket; The outlet end of the guide channel is located at the magnetic ring mating surface of the rotor bracket, and the inlet end of the discharge channel is located at the shaft sleeve mating surface of the rotor bracket; The shaft sleeve mating surface between the shaft sleeve and the rotor support and the magnetic ring mating surface between the magnetic ring and the rotor support are staggered in the axial direction; Alternatively, the axial length of the shaft sleeve mating surface between the shaft sleeve and the rotor support is shorter than the axial length of the magnetic ring mating surface between the magnetic ring and the rotor support; The horizontal height of the mating surface between the magnetic ring and the rotor support is lower than the horizontal height of the mating surface between the shaft sleeve and the rotor support; Therefore, the level of the outlet end of the guide channel is lower than the level of the inlet end of the discharge channel.

2. The rotor assembly according to claim 1, wherein: The rotor bracket is integrally combined with the shaft sleeve and the magnetic ring by an integral injection molding method, so that the shaft sleeve is inserted into the rotor bracket and the magnetic ring is sleeved outside the rotor bracket.

3. The rotor assembly according to claim 1, wherein: Also includes an impeller; One end of the rotor bracket expands in the radial direction to form an impeller mounting platform; The impeller is fixed to the impeller mounting platform of the rotor bracket by ultrasonic welding.

4. The rotor assembly according to claim 1, wherein: The magnetic ring mating surface of the rotor support is configured as a hollow structure at the guide channel and / or the discharge channel, so that the inner wall of the magnetic ring serves as a part of the guide channel and / or the discharge channel.

5. The rotor assembly according to claim 1 or 4, characterized in that: The bottom end surface of the sleeve serves as a part of the discharge channel.

6. The rotor assembly according to any one of claims 1 to 3, characterized in that: The top end surface of the rotor bracket is concave to form an axial avoidance groove; The inlet end of the guide channel and the outlet end of the discharge channel are both located at the bottom of the axial avoidance groove.

7. An electronic water pump, characterized in that: A rotor assembly comprising any one of claims 1 to 6; It also includes a pump cover, a pump chamber structure shell, a stator-pump shell assembly, a drive circuit board, a rear end cover and a shaft core; The pump cover and the pump chamber structure shell are fixedly combined to form a pump chamber structure; The pump cover is respectively formed with a water inlet and a water outlet communicating with the inner and outer sides of the pump cavity structure; One end of the shaft core is fixedly matched with the pump chamber structure shell, and the other end of the shaft core is fixedly matched with the pump cover to support the shaft core in the pump chamber structure; The shaft sleeve of the rotor assembly is sleeved on the shaft core and rotates with the shaft core; The stator-pump housing assembly includes a pump housing and a stator assembly, wherein the pump housing is formed outside the stator assembly in an overmolding manner so that the stator assembly is buried in the pump housing; The pump cover, the pump chamber structure shell, and the pump shell of the stator-pump shell assembly are fixed in sequence along the axial direction, so that the stator assembly of the stator-pump shell assembly and the magnetic ring of the rotor assembly are aligned with each other in the radial direction; The driving circuit board is accommodated and fixed in the pump housing, and the end cover is fixed to one end of the pump housing and covers the opening of the pump housing; The driving circuit board is electrically connected to the stator component of the stator-pump housing assembly, so that the stator component can be magnetically coupled to drive the rotor component to rotate within the pump chamber structure with the shaft core as the axis; The liquid in the pump chamber structure can pass through the guide channel from the top of the rotor bracket to the bottom of the rotor bracket, and the liquid in the pump chamber structure can pass through the discharge channel from the bottom of the rotor bracket to the top of the rotor bracket.

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