Injection-molded prefabricated bearing assembly, rotor assembly and electronic water pump applying injection-molded prefabricated bearing assembly and rotor assembly

Abstract

The utility model discloses an injection-molded prefabricated bearing assembly, a rotor assembly and an electronic water pump using the same, and relates to the technical field of electronic water pumps and parts thereof. At least one bearing loading part suitable for embedding at least one bearing in the axial direction is formed at at least one end of the injection molding prefabricated part, and the bearing is correspondingly embedded into the bearing loading part of the injection molding prefabricated part; and an overflowing channel penetrating through the injection molding prefabricated part is formed in the axial direction of the injection molding prefabricated part. The utility model mainly solves the problem of how to prevent impurities entrained by liquid from accumulating on the surface of the rotor assembly; according to the utility model, the area of a liquid passing path is enlarged in a limited space, the impurity discharge capacity is improved, impurities are not easy to accumulate on the surface of the rotor assembly, and the impurities at the bottom of the rotor assembly and in a pump cavity are raised and discharged through the impact capacity of the liquid; and the performance, the stability, the heat dissipation effect and the service life of the electronic water pump are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic water pumps and parts thereof, in particular to an injection-molded prefabricated bearing assembly, 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 electronic water pumps. In the prior art, the rotor assembly of electronic water pumps usually integrates a magnetic ring and an impeller on the 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 "Injection Molded Prefabricated Bearing Assembly, 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 on the surface of the rotor assembly to form 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 on the surface of the rotor assembly has become an urgent problem to be solved. Utility Model Content

[0006] The purpose of the utility model is to provide an injection-molded prefabricated bearing assembly, a rotor assembly and an electronic water pump using the same, which can effectively prevent impurities carried by the liquid from accumulating on the surface of the rotor assembly.

[0007] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: an injection-molded prefabricated bearing assembly, comprising an injection-molded prefabricated part and a plurality of bearings; at least one end of the injection-molded prefabricated part forms a bearing-loading portion suitable for embedding at least one of the bearings in an axial direction, and the bearings are correspondingly embedded in the bearing-loading portion of the injection-molded prefabricated part; the injection-molded prefabricated part forms a flow channel running through it in its axial direction.

[0008] In the above technical solution, the injection molded preform extends a protrusion outward along its radial direction; the flow channel of the injection molded preform is formed at the protrusion; and the protrusion of the injection molded preform is suitable for cooperating with the rotor bracket of the rotor assembly.

[0009] In the above technical solution, a plurality of the raised portions are evenly distributed along the circumferential direction of the injection molded preform; and the flow channel is formed on each of the raised portions.

[0010] In the above technical solution, both ends of the injection molded preform form the bearing loading parts.

[0011] In the above technical solution, the bearing loading portion of the injection molded preform and the bearing are provided with a key on one of them and a keyway matching the key on the other.

[0012] A rotor assembly comprises the above-mentioned injection-molded prefabricated bearing assembly, and further comprises a rotor support, a magnetic ring, and an impeller; the rotor support is radially overmolded outside the injection-molded prefabricated part of the injection-molded prefabricated bearing assembly; the magnetic ring is sleeved on the rotor support, and the impeller is fixed to one end of the rotor support; a flow groove is formed on the rotor support, and the flow groove and the flow channel of the injection-molded prefabricated part are aligned with each other, so that fluid can pass through the flow groove of the rotor support and the flow channel of the injection-molded prefabricated part.

[0013] In the above technical solution, the injection molded preform extends a protrusion outward along its radial direction; the flow channel of the injection molded preform is formed at the protrusion; and the protrusion of the injection molded preform can be embedded in the inner wall of the rotor bracket.

[0014] In the above technical solution, the rotor support is provided with a flow hole penetrating the rotor support in a radial direction; the fluid can pass through the flow hole of the rotor support and enter the internal space of the rotor support.

[0015] In the above technical solution, axial engaging ribs are formed on the inner wall of the rotor bracket; the axial engaging ribs respectively abut against two end surfaces of the injection-molded preform of the injection-molded preform bearing assembly.

[0016] An electronic water pump comprises the above-mentioned rotor assembly.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: in the injection-molded prefabricated bearing assembly, rotor assembly and electronic water pump using the same, the liquid can pass through the flow groove of the rotor bracket and the flow channel of the injection-molded prefabricated part, thereby passing through the rotor assembly axially; in this way, the path area for the liquid to pass through is increased 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 on the surface of the rotor assembly; on the other hand, through the impact capacity of the liquid, the impurities on the bearing surface are washed away, and the impurities at the bottom of the rotor assembly and in the pump cavity are lifted up, and then pass through the rotor assembly and / or the pump cavity to reach the internal space of the pump cover, and finally be discharged through the water outlet of the pump cover; in addition, the liquid can pass through the rotor assembly axially, thereby improving the heat dissipation performance of the rotor assembly; the present invention effectively avoids the problem of impurities accumulating on the surface of the rotor assembly, 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 This is a three-dimensional view of the injection-molded prefabricated bearing assembly in the present invention.

[0019] Figure 2 This is an exploded structural view of the injection-molded prefabricated bearing assembly in the present invention.

[0020] Figure 3 This is a cross-sectional structural view of the injection-molded prefabricated bearing assembly in the present invention.

[0021] Figure 4 It is a three-dimensional view of the rotor assembly in the present invention.

[0022] Figure 5 This is one of the exploded structural views of the rotor assembly in the present invention.

[0023] Figure 6 This is the second exploded structural view of the rotor assembly in the present invention.

[0024] Figure 7 This is a cross-sectional structural view of the rotor assembly in the present invention.

[0025] The accompanying drawings are marked as follows: 1. injection molded preform; 11. bearing loading part; 111. key; 12. axial limiting part; 13. axial through hole; 14. protrusion; 15. flow channel; 2. bearing; 21. keyway; 3. rotor bracket; 31. flow groove; 32. axial locking rib; 33. magnetic ring embedding part; 34. magnetic ring limiting part; 35. impeller mounting platform; 36. flow hole; 4. magnetic ring; 5. impeller; 51. blade. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described 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.

[0027] This embodiment provides an injection-molded prefabricated bearing assembly that can cooperate with multiple bearings in a rotor assembly to improve the concentricity of each bearing; in addition, the injection-molded prefabricated bearing assembly of this embodiment can also allow liquid to pass axially through itself to avoid impurities entrained by the liquid from accumulating on the surface of the rotor assembly.

[0028] See also Figure 1-Figure 3 The injection molded prefabricated bearing assembly of this embodiment includes an injection molded preform 1 and a plurality of bearings 2, wherein the injection molded preform 1 is an integrally injection-molded cylindrical engineering plastic workpiece, and the bearing 2 is a ceramic bearing, a graphite bearing or a self-lubricating sleeve.

[0029] At least one end of the injection molded preform 1 is formed with a bearing loading portion 11 suitable for axially embedding at least one bearing 2 therein. In fact, the bearing loading portion 11 is a cylindrical slot extending from the end face of the injection molded preform 1 in the axial direction toward the interior of the injection molded preform 1. The bearing 2 is correspondingly embedded in the bearing loading portion 11 of the injection molded preform 1.

[0030] The injection molded preform 1 is formed with a flow channel 15 penetrating the injection molded preform 1 along its axial direction, so as to allow liquid to pass axially through the injection molded preform 1 from the flow channel 15 .

[0031] Specifically, the injection molded preform 1 extends a protrusion 14 outward along its radial direction, that is, the protrusion 14 is a radially raised rib-like feature on the side of the injection molded preform 1. In fact, the protrusion 14 is injection molded integrally with the injection molded preform 1; the flow channel 15 of the injection molded preform 1 is formed at the protrusion 14, that is, the flow channel 15 actually penetrates the protrusion 14 along the axial direction. It can be understood that the flow channel 15 is also injection molded integrally with the injection molded preform 1.

[0032] Furthermore, a number of raised portions 14 are evenly distributed along the circumferential direction of the injection molded preform 1 , and a flow channel 15 is formed on each raised portion 14 . In this embodiment, three raised portions 14 are evenly distributed along the circumferential direction of the injection molded preform 1 .

[0033] Specifically, bearing loading portions 11 are formed at both ends of the injection molded preform 1, and each bearing loading portion 11 can accommodate a bearing 2 embedded therein; when the injection molded preform 1 is used, after its two bearing loading portions 11 are respectively embedded in a bearing 2, the two bearings 2 can be made coaxial, ensuring the concentricity of the two bearings 2.

[0034] Furthermore, the inner wall of the injection molded preform 1 is narrowed in its radial direction, thereby forming an axial limiting portion 12 at the end of the bearing loading portion 11; the bearing 2 can abut against the axial limiting portion 12, thereby achieving axial limiting of the bearing 2 and determining the axial assembly position of the bearing 2.

[0035] Furthermore, the axial limiting portion 12 is provided with an axial through hole 13 along its axial direction for the shaft core of the electronic water pump to pass through; and the inner diameter of the axial through hole 13 is larger than the inner diameter of the bearing 2, so that the injection molded preform 1 will not rub against the shaft core of the electronic water pump.

[0036] Furthermore, the bearing mounting portion 11 of the injection molded preform 1 and the bearing 2 are provided with a key 111 on one side and a keyway 21 for cooperating with the key 111 on the other side. In this embodiment, the key 111 is provided on the inner wall of the bearing mounting portion 11 of the injection molded preform 1, and the keyway 21 is provided on the outer wall of the bearing 2.

[0037] During the manufacturing of the injection-molded prefabricated bearing assembly of this embodiment, the bearing 2 is first placed in the mold of the injection-molded preform 1, and then liquid plastic is injected into the mold. Under the guidance of the mold cavity and the bearing 2, the liquid plastic forms the injection-molded preform 1 and the bearing loading portion 11, key 111, axial limiting portion 12, axial through hole 13, protrusion 14 and flow channel 15 on the injection-molded preform 1. After demolding, the injection-molded preform 1 and the bearing 2 are integrated to form the injection-molded prefabricated bearing assembly of this embodiment, which can be directly used in the rotor assembly of the electronic water pump.

[0038] This embodiment also provides a rotor assembly that can be used in an electronic water pump to drive water flow.

[0039] See also Figure 4-Figure 7 The rotor assembly of this embodiment includes the above-mentioned injection-molded prefabricated bearing assembly, which also includes a rotor bracket 3, a magnetic ring 4 and an impeller 5.

[0040] Among them, the rotor bracket 3 is an integrally injection-molded engineering plastic workpiece, which is used as the structural basis of the rotor assembly; the impeller 5 is also an integrally injection-molded engineering plastic workpiece, and a plurality of blades 51 are arranged on the impeller 5, which are used to drive the water flow; the magnetic ring 4 is a circular permanent magnet, which has a certain magnetism.

[0041] The rotor bracket 3 is radially overmolded on the injection-molded preformed part 1 of the injection-molded prefabricated bearing assembly; the magnetic ring 4 is sleeved on the rotor bracket 3 , and the impeller 5 is fixed on one end of the rotor bracket 3 .

[0042] In order to prevent impurities carried by the liquid from accumulating on the surface of the rotor assembly, flow grooves 31 are formed on the rotor bracket 3. Specifically, the flow grooves 31 are integrally injection-molded with the rotor bracket 3, and the number and positions of the flow grooves 31 correspond to the flow channels 15 of the injection-molded preform 1; the flow grooves 31 and the flow channels 15 of the injection-molded preform 1 are aligned with each other, and the fluid can pass through the flow grooves 31 of the rotor bracket 3 and the flow channels 15 of the injection-molded preform 1.

[0043] It is understandable that the rotor bracket 3 is formed with flow grooves 31 at both ends of the injection molded preform 1 .

[0044] Furthermore, the protrusion 14 of the injection-molded preform 1 can be embedded into the inner wall of the rotor support 3 .

[0045] A protrusion 14 is provided on the injection molded preform 1 , and thus a flow channel 15 is provided on the protrusion 14 , thereby preventing the flow channel 15 from being directly formed on the injection molded preform 1 and reducing the mechanical strength of the injection molded preform 1 , and also preventing the flow channel 15 from occupying the axial wall thickness of the rotor bracket 3 .

[0046] Furthermore, the rotor bracket 3 is provided with a flow hole 36 penetrating the rotor bracket 3 in a radial direction, and the fluid can pass through the flow hole 36 of the rotor bracket 3 and enter the internal space of the rotor bracket 3; in this embodiment, the flow hole 36 is arranged at a position of the rotor bracket 3 that is higher than the injection-molded prefabricated bearing assembly and the magnetic ring 4, but lower than the impeller 5; in this embodiment, two flow holes 36 are provided, and both are injection-molded integrally with the rotor bracket 3.

[0047] Furthermore, the inner wall of the rotor bracket 3 is formed with axial engaging ribs 32; the axial engaging ribs 32 respectively press against the two end faces of the injection molded preform 1 of the injection molded prefabricated bearing assembly, so that the axial dislocation of the injection molded prefabricated bearing assembly can be effectively avoided.

[0048] Furthermore, the outer wall of the rotor bracket 3 is concave to form a magnetic ring embedding portion 33, and the magnetic ring 4 is embedded in the magnetic ring embedding portion 33 of the rotor bracket 3; since the magnetic ring 4 is embedded in the magnetic ring embedding portion 33, the outer side surface of the magnetic ring 4 is flush with the outer side surface of the rotor bracket 3, thereby improving the degree of integration of the rotor assembly; magnetic ring limiting portions 34 are respectively formed at both ends of the magnetic ring embedding portion 33 of the rotor bracket 3, and the magnetic ring limiting portions 34 respectively abut against the two end faces of the magnetic ring 4, which can effectively prevent the magnetic ring 4 from axial dislocation.

[0049] Furthermore, an impeller mounting platform 35 is formed on the end face of the rotor support 3, and the impeller mounting platform 35 is integrally injection molded with the rotor support 3; the impeller 5 is fixed on the impeller mounting platform 35, specifically, several blades 51 on the impeller 5 are fixed to the impeller mounting platform 35 by ultrasonic welding, so that the impeller 5 and the rotor support 3 are combined into one.

[0050] During the manufacturing of the rotor assembly of this embodiment, the injection-molded prefabricated bearing assembly and the magnetic ring 4 are first placed in the mold of the rotor support 3, and then liquid plastic is injected into the mold. Under the guidance of the mold cavity, the injection-molded prefabricated bearing assembly and the magnetic ring 4, the liquid plastic forms the rotor support 3 and the flow groove 31, axial engaging ribs 32, magnetic ring embedding portion 33, magnetic ring limiting portion 34, impeller mounting platform 35 and flow hole 36 on the rotor support 3; after demolding, the injection-molded prefabricated bearing assembly and the magnetic ring 4 are integrated with the rotor support 3; finally, several blades 51 on the impeller 5 are fixed to the impeller mounting platform 35 by ultrasonic welding, so that the impeller 5 and the rotor support 3 are combined into one, and the manufacture of the rotor assembly is completed.

[0051] The rotor assembly of this embodiment is used in the pump chamber of the electronic water pump. When rotating, it can drive the water flow (specifically, the water flow is driven by the plurality of blades 51 on the impeller 5). During the above process, the liquid can pass through the flow groove 31 of the rotor bracket 3 and the flow channel 15 of the injection molded preform 1, thereby passing through the rotor assembly axially. In addition, the liquid can also pass through the flow hole 36 of the rotor bracket 3, thereby passing through the rotor assembly radially. In this way, the path area for the liquid to pass is increased within a limited space, thereby increasing the flow rate of the liquid and improving the ability to discharge impurities. , making it difficult for impurities to accumulate on the surface of the rotor assembly; secondly, through the impact of the liquid, the impurities on the surface of the bearing 2 are washed away, so that the impurities at the bottom of the rotor assembly and in the pump cavity are lifted up, and then pass through the rotor assembly and / or the pump cavity to reach the internal space of the pump cover, and finally discharged through the water outlet of the pump cover; in addition, the liquid can pass through the rotor assembly axially, thereby improving the heat dissipation performance of the rotor assembly; this embodiment effectively avoids the problem of impurities accumulating on the surface of the rotor assembly, 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.

[0052] This embodiment also provides an electronic water pump, which includes the above-mentioned rotor assembly.

[0053] Although the embodiments of the present invention have been shown and described, it will be understood 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 present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An injection molded prefabricated bearing assembly comprising an injection molded prefabricated part and a plurality of bearings; At least one end of the injection molded preform forms a bearing loading portion suitable for embedding at least one bearing in the axial direction, and the bearing is correspondingly embedded in the bearing loading portion of the injection molded preform; characterized in that, The injection molded preform forms a flow passage penetrating the preform along its axial direction.

2. The injection molded prefabricated bearing assembly according to claim 1, characterized in that: The injection molded preform extends a convex portion outward along its radial direction; The flow channel of the injection molded preform is formed on the protrusion.

3. The injection molded prefabricated bearing assembly according to claim 2, characterized in that: The protrusions are evenly distributed in a plurality along the circumferential direction of the injection molded preform; The flow channel is formed on each of the protruding portions.

4. The injection molded prefabricated bearing assembly according to any one of claims 1 to 3, characterized in that: Both ends of the injection molded preform form the bearing loading portions.

5. The injection molded prefabricated bearing assembly according to claim 1, characterized in that: The bearing loading portion of the injection molded preform and the bearing include: One of them is provided with a key, and the other is provided with a key groove that cooperates with the key.

6. A rotor assembly, characterized in that: The injection molded prefabricated bearing assembly comprises any one of claims 1 to 5, further comprising a rotor bracket, a magnetic ring, and an impeller; The rotor support is radially overmolded outside the injection molded preform of the injection molded preform bearing assembly; The magnetic ring is sleeved on the rotor bracket, and the impeller is fixed to one end of the rotor bracket; A flow groove is formed at the rotor bracket, and the flow groove and the flow channel of the injection molded preform are aligned with each other, so that fluid can pass through the flow groove of the rotor bracket and the flow channel of the injection molded preform.

7. The rotor assembly according to claim 6, wherein: The injection molded preform extends a convex portion outward along its radial direction; The flow channel of the injection molded preform is formed at the protrusion; The projection of the injection-molded preform can be embedded in the inner wall of the rotor support.

8. The rotor assembly according to claim 6 or 7, characterized in that: The rotor support is provided with a flow hole penetrating the rotor support in a radial direction; Fluid can pass through the flow holes of the rotor support and enter the inner space of the rotor support.

9. The rotor assembly according to claim 8, wherein: An axial engaging rib is formed on the inner wall of the rotor bracket; The axial engaging ribs respectively abut against two end surfaces of the injection-molded preform of the injection-molded preform bearing assembly.

10. An electronic water pump, characterized in that: The rotor assembly comprises any one of claims 6 to 9.

Images