Plastic package rotor assembly and water pump using same

Abstract

A plastic package rotor assembly and a water pump, the plastic package rotor assembly comprises a plastic package shell and a rotor assembling assembly with a rotor supporting part, the rotor supporting part comprises a rotating shaft and a mounting rack injection-molded on the rotating shaft, the mounting rack comprises an annular base and a plurality of convex ribs extending out of the outer edge of one end of the base along the axial direction, the rotor assembling assembly further comprises an iron core installed on the base, a plurality of permanent magnets arranged on the periphery of the iron core and an annular columnar steel sleeve covering the iron core, the protruding ribs are evenly distributed in the circumferential direction and divide the permanent magnets in the circumferential direction, and the plastic package shell is a columnar plastic body surrounding the permanent magnets and the steel sleeve. And the iron core, the permanent magnet and the steel sleeve are wrapped in the inner cavity of the cylindrical body. According to the plastic package rotor assembly, the rotor supporting part is optimized, so that the situations of injection molding defects and magnetic performance reduction of an injection-molded product caused by displacement of the iron core and the permanent magnet due to impact of injection molding plastic in the injection molding process can be reduced, and the magnetic performance of the plastic package rotor assembly is considered while the production qualification rate of the plastic package rotor assembly is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a plastic package rotor assembly, especially to a water pump applying the plastic package rotor assembly, and its IPC classification number is F04D29 / 22. BACKGROUND

[0002] The existing rotor includes a rotating shaft, a core and a permanent magnet, when manufacturing, first, the rotating shaft and the core are taken as a mold insert to form a first plastic part through one-time injection molding, the first plastic part fixes and connects the rotating shaft and the core; then, the permanent magnet is attached and installed on the core to form a rotor assembly; finally, the plastic package rotor assembly is taken as a mold insert to form a rotor shell wrapping the core and the permanent magnet through two-time injection molding. In the process of one-time and two-time injection molding, the core and the permanent magnet are prone to displacement under the impact of injection plastic, resulting in a low production pass rate, thus there is a need for improvement.

[0003] For relevant terms and common knowledge, refer to the national standard GB / T 33925.1 "General terms, definitions, quantities, characters and units for liquid pumps and their apparatuses Part 1: Liquid pumps", the mechanical industry standard JB / T5415 "Micro centrifugal electric pump", the mechanical engineering manual and the electrical engineering manual published by the Mechanical Industry Press in 1983 or 1997, the Pump Theory and Technology published by the Mechanical Industry Press in 2014, the Modern Pump Theory and Technology published by the China Astronautics Publishing House in 2011, the Pump and Fan published by the China Electric Power Press in 2008 and the like. CONTENT OF THE UTILITY MODEL

[0004] To meet the improvement needs described in the background, the utility model provides the following technical solutions:

[0005] A plastic package rotor assembly, comprising a plastic package shell and a rotor assembly component with a rotor support part, the rotor support part comprising a rotating shaft and a mounting rack injection molded on the rotating shaft, the mounting rack comprising a ring-shaped base and a plurality of protrusions extending axially along the outer edge of one end of the base, characterized in that: the rotor assembly component further comprises a core mounted on the base, a plurality of permanent magnets arranged on the outer periphery of the core, and a ring-cylindrical steel sleeve arranged on the side of the core axially away from the base, the protrusions are uniformly distributed in the circumferential direction and separate the permanent magnets in the circumferential direction, and the plastic package shell is a cylindrical plastic body embracing the permanent magnets and the steel sleeve, which wraps the core, the permanent magnets and the steel sleeve in the inner cavity of the cylindrical body.

[0006] The plastic package rotor assembly of the utility model optimizes the rotor support part, which can reduce the displacement of the core and the permanent magnet caused by the impact of injection plastic during injection molding, resulting in injection defects (such as lack of glue or insecure connection) and reduced magnetic performance of the product after injection molding, thereby improving the production pass rate of the plastic package rotor assembly while taking into account its magnetic performance.

[0007] Furthermore, a columnar boss protrudes from the end face of the base on the side axially away from the iron core, and the axial end face of the boss is exposed outside the plastic-encapsulated shell.

[0008] Furthermore, the base has a raised annular rim on the end face opposite to the iron core in the axial direction, and the plastic-encapsulated shell fits tightly against the base and wraps around the rim.

[0009] Furthermore, the surface of the rib that faces the permanent magnet also has a limiting part that restricts the circumferential and radial displacement of the permanent magnet.

[0010] Furthermore, the mounting bracket also includes a connecting column extending from the axial end face of the base and encircling the rotating shaft; the radial protrusion of the connecting column forms a connecting boss, and the middle of the iron core is provided with a through hole, the inner wall surface of the through hole is recessed to form a groove adapted to the connecting boss; or the middle of the iron core is provided with a through hole, the inner wall surface of the through hole protrudes to form a boss, and the radial indentation of the connecting column forms a connecting groove adapted to the boss.

[0011] Furthermore, the base has an axially provided base hole, and the connecting boss has an axially provided connecting boss hole. In the axial projection of the rotor assembly, the projection of the base hole at least partially overlaps with the connecting boss hole.

[0012] Furthermore, the connecting post has an annular connecting post rim protruding from the axial end face away from the base, surrounding the pivot shaft, and the plastic-encapsulated housing encloses the connecting post rim within its inner cavity.

[0013] Furthermore, the axial surface of the plastic-encapsulated housing is provided with a housing hole that covers the inner wall of the base hole.

[0014] Furthermore, the steel sleeve includes a hollow plate-shaped base and a first limiting portion formed by protruding from the edge of the base to one end, and the base is also provided with a protrusion forming a protrusion at the other end axially.

[0015] This utility model also discloses a centrifugal pump:

[0016] A water pump includes a pump body, a stator fixed to the pump body, a pump cover, an impeller, and a plastic-encapsulated rotor assembly according to any one of claims, characterized in that: the impeller is disposed on one axial side of the plastic-encapsulated rotor assembly, the pump body includes a cylindrical inner shell of the pump body, and the plastic-encapsulated rotor assembly is rotatably mounted in the inner cavity of the inner shell of the pump body.

[0017] The more specific design and technical effects of this utility model are further explained in conjunction with the accompanying drawings in the specific embodiments. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural schematic diagram of the encapsulated rotor assembly of this utility model;

[0019] Figure 2 This is an axial sectional view of the encapsulated rotor assembly of this utility model;

[0020] Figure 3 is a three-dimensional structure schematic view of a rotor assembly of the utility model;

[0021] Figure 4 is another angle three-dimensional structure schematic view of a rotor assembly of the utility model;

[0022] Figure 5 is a three-dimensional structure schematic view of a steel sleeve assembly of the utility model;

[0023] Figure 6 is a three-dimensional structure schematic view of a rotor support part of the utility model;

[0024] Figure 7 is a radial sectional view of a rotor assembly of the utility model;

[0025] Figure 8 is Figure 7 is a local enlarged structure schematic view of A in the figure;

[0026] Figure 9 is an axial sectional view of a water pump of the utility model;

[0027] wherein:

[0028] 10-plastic package rotor assembly, 20-rotor assembly, 21-boss, 22-enclosure, 23-limiting part, 24-base hole, 25-connection boss hole, 26-connection column enclosure, 30-pump body, 40-stator, 50-pump cover, 60-impeller, 100-plastic package shell, 110-shell hole, 200-rotor support part, 210-rotor shaft, 220-mounting frame, 221-base, 222-convex rib, 223-connection column, 224-connection boss, 230-iron core, 231-through hole, 232-groove, 240-permanent magnet, 250-steel sleeve, 251-base, 252-first limiting part, 253-protruding part DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0030] see Figures 1 to 4The utility model discloses a plastic package rotor assembly 10, this plastic package rotor assembly 10 includes plastic package shell 100 and rotor assembly component 20, wherein, rotor assembly component 20 includes rotor support part 200, install on rotor support part 200 on the iron core 230, the several permanent magnet 240 of interval setting in the radial surface of iron core 230 and the ring columnar steel bushing 250 of covering in the axial one side of iron core 230, plastic package shell 100 is with rotor assembly component 20 as insert injection molding forms the columnar body of embracing permanent magnet 24 and steel bushing 250, and plastic package shell 100 will iron core 230, permanent magnet 240 and steel bushing 250 are wrapped in the inner chamber of its columnar body.

[0031] See Figure 5 And Figure 6 The rotor support part 200 of the utility model includes the rotating shaft 210 and the mounting bracket 220 fixed on the rotating shaft 210, the mounting bracket 200 and the fixed mode of the rotating shaft 210 can adopt hot fusion, interference fit, insert injection molding and other processes, preferably, the mounting bracket 200 of the utility model is with the rotating shaft 210 as a mold insert, fixed on the rotating shaft 210 through injection molding. The mounting bracket 220 of the utility model includes the annular base 221 and the several columnar convex ribs 222 extending axially along the outer edge of one end of the base 221. When assembling, first install the iron core 230 on the base 221, then install the permanent magnet 240 on the outer circumferential surface of the iron core 230, wherein, the convex rib 222 is located on the radial outer side of the iron core 230, and the permanent magnet 240 is circumferentially separated. Preferably, the permanent magnet 240 of the utility model is rubidium iron boron, of course, as other embodiments, the permanent magnet can also be other magnets that can long-term maintain its magnetism.

[0032] See Figure 1 And Figure 4 As a preferred embodiment, the base 221 of the utility model has a columnar boss 21 protruding from the end face axially away from the iron core 230, and the axial end face of the boss 21 is exposed to the plastic package shell 100 after the injection molding of the plastic package shell 100 is completed. The mounting bracket 220 with the above design can provide support when producing the plastic package shell 100 by injection molding, so that the plastic package shell 100 better wraps the base 221, reduces the cracking caused by the loose connection between the base 221 and the plastic package shell 100, and improves the yield of producing the plastic package rotor assembly. Further, see Figure 7 And Figure 8 As a preferred embodiment, the surface of the convex rib 222 of the rotor support part 200 in the embodiment meets the surface of the convex rib 240, and the limiting portion 23 limiting the circumferential and radial displacement of the permanent magnet 240 is protruded. The above design can reduce the displacement of the permanent magnet 230 when the plastic package shell is injection molded, and improve the yield of producing the plastic package rotor assembly.

[0033] See Figure 2 And Figure 4As a preferred embodiment, to avoid external liquid from the joint between the plastic package shell 100 and the base 221 to penetrate into the inner cavity of the plastic package shell 100 and react with the iron core and the permanent magnet, the working life of the plastic package rotor assembly is improved. The base 221 in the embodiment has a ring-shaped surrounding edge 22 protruding from the end surface axially away from the iron core 230. After the rotor assembly 20 is injection molded, the plastic package shell 100 is tightly attached to the base 221 and wraps the surrounding edge 22.

[0034] See Figure 6 The mounting bracket 220 of the rotor support 200 further includes a connecting column 223 protruding from the axial end surface of the base 221 and surrounding the rotating shaft. Further, the outer peripheral surface of the connecting column 223 is radially protruding to form a connecting boss 224. Further, see Figure 5 and Figure 7 The iron core 230 is a columnar body (preferably a columnar body with a positive multi-variant projection in the axial direction), and a through hole 231 is provided in the middle part of the iron core 230. The inner wall surface of the through hole 231 is concave to form a groove 232. During assembly, the rotating shaft 210 of the rotating shaft plastic package part 200 passes through the through hole 231, and the connecting boss 224 is clamped into the groove 232. After the above design, the connection strength between the rotating shaft, the base, and the iron core can be enhanced, the slippage of the three parts can be reduced, the normal use can be ensured, and the working reliability of the plastic package rotor assembly can be improved. Of course, as another embodiment, a through hole is provided in the middle part of the iron core, the inner wall surface of the through hole is protruding to form a boss, and the outer peripheral surface of the connecting column 223 is radially concave to form a connecting groove matched with the boss, and the above technical effects can also be achieved. Further, the axial direction of the base 221 of the mounting bracket 220 is further provided with a base hole 24 penetrating through the base, and the axial direction of the connecting boss 224 is provided with a connecting boss hole 25 penetrating through the connecting boss 224. In the axial projection of the rotor assembly, the projection of the base hole 24 at least partially overlaps with the connecting boss hole 25. By the above design, the injection molding of the plastic package shell allows the injection molding plastic to pass through the base hole and the connecting boss hole, enhances the connection strength between the iron core and the base, and reduces the slippage of the two parts.

[0035] See Figure 2 and Figure 6 To reduce the penetration of external liquid into contact with the iron core 230 and the permanent magnet 240 and the reaction, the working stability of the plastic package rotor assembly is further improved. The connecting column 223 of the mounting bracket 220 protrudes from the axial end surface away from the base 221 and surrounds the rotating shaft to form a ring-shaped connecting column surrounding edge 26. After the injection molding of the plastic package shell 100 is completed, the plastic package shell 100 wraps the connecting column surrounding edge 26 in the inner cavity.

[0036] Further, see Figure 1 and Figure 2In order to provide positioning for magnetizing the plastic-sealed rotor assembly, and facilitate subsequent operation, the axial surface of the plastic-sealed shell 100 is provided with a shell hole 110 covering the inner wall of the base hole 24.

[0037] The structure of the steel sleeve 250 is shown in the drawings. Figure 5 The steel sleeve 250 includes a hollow plate-shaped base 251 and a first limiting portion 252 protruding from the edge of the base to one end, and further, a protruding portion 253 protruding from the edge of the base 251 to the other end in the axial direction. The steel sleeve designed in the above can avoid damage caused by the impact of injection molding plastic during injection molding of the plastic-sealed shell, and improve the yield of the production of the plastic-sealed rotor assembly.

[0038] The plastic-sealed rotor assembly of the utility model can reduce the displacement of the iron core and the permanent magnet caused by the impact of injection molding plastic during injection molding, and can reduce the injection defects (such as lack of glue or loose connection) and the reduction of magnetic properties of the product after injection molding, thereby improving the yield of the production of the plastic-sealed rotor assembly while considering the magnetic properties.

[0039] The utility model discloses a water pump, see Figure 9 The pump body 30, the stator 40 fixed on the pump body 30, the pump cover 50 forming the impeller cavity with the pump body 30, the impeller 60 accommodated in the impeller cavity and the above-mentioned plastic-sealed rotor assembly 10, wherein the impeller 60 is fixed to the axial end of the rotor shaft of the plastic-sealed rotor assembly 10, the pump body 30 includes a cylindrical pump body inner shell 31, and the plastic-sealed rotor assembly 10 is rotatably installed in the inner cavity of the pump body inner shell 31.

[0040] The water pump of the utility model adopts the plastic-sealed rotor assembly of the utility model, and the working stability and working life are improved.

Claims

1. A plastic-encapsulated rotor assembly, comprising a plastic-encapsulated housing (100) and a rotor assembly (20) having a rotor support portion (200), wherein the rotor support portion (200) includes a rotating shaft (210) and a mounting bracket (220) injection-molded onto the rotating shaft, the mounting bracket (220) including an annular base (221) and a plurality of ribs (222) extending axially from the outer edge of one end of the base (221), characterized in that: The rotor assembly also includes an iron core (230) mounted on a base (221), several permanent magnets (240) disposed on the outer periphery of the iron core (230), and a cylindrical steel sleeve (250) covering the side of the iron core axially away from the base. The ribs (222) are evenly distributed circumferentially and circumferentially separate the permanent magnets (240). The plastic-encapsulated shell (100) is a cylindrical plastic body that surrounds the permanent magnets (240) and the steel sleeve (250), which encloses the iron core (230), the permanent magnets (240), and the steel sleeve (250) in the inner cavity of the cylindrical body.

2. The encapsulated rotor assembly according to claim 1, characterized in that: The base (221) has a columnar boss (21) protruding on the end face of the side axially away from the iron core (230), and the axial end face of the boss (21) is exposed outside the plastic-encapsulated shell (100).

3. The encapsulated rotor assembly according to claim 1 or 2, characterized in that: The base (221) has an annular rim (22) protruding on the end face opposite to the iron core in the axial direction. The plastic-encapsulated shell (100) is close to the base (221) and wraps the rim (22).

4. The encapsulated rotor assembly according to claim 1, characterized in that: The surface of the rib (222) facing the permanent magnet (240) also has a limiting part (23) that restricts the circumferential and radial displacement of the permanent magnet.

5. The encapsulated rotor assembly according to claim 1, characterized in that: The mounting bracket (220) further includes a connecting column (223) extending from the axial end face of the base (221) and encircling the rotating shaft; the radial protrusion of the connecting column (223) forms a connecting boss (224), and the iron core (230) is provided with a through hole (231) in the middle, and the inner wall surface of the through hole (231) is recessed to form a groove (232) adapted to the connecting boss (224); or the iron core is provided with a through hole in the middle, the inner wall surface of the through hole protrudes to form a boss, and the radial concavity of the connecting column forms a connecting groove adapted to the boss.

6. The encapsulated rotor assembly according to claim 5, characterized in that: The base (221) has an axially provided base hole (24), and the connecting boss (224) has an axially provided connecting boss hole (25). In the axial projection of the rotor assembly, the projection of the base hole (24) at least partially overlaps with the connecting boss hole (25).

7. The encapsulated rotor assembly according to claim 5 or 6, characterized in that: The connecting post (223) has an annular connecting post rim (26) protruding on the axial end face away from the base (221) and surrounding the rotating shaft (210). The plastic-encased shell (100) encloses the connecting post rim (26) in its inner cavity.

8. The encapsulated rotor assembly according to claim 6, characterized in that: The axial surface of the plastic-encapsulated housing (100) is provided with a housing hole (110) covering the inner wall of the base hole (24).

9. The encapsulated rotor assembly according to claim 1, characterized in that: The steel sleeve (250) includes a hollow plate-shaped base (251) and a first limiting part (252) that protrudes from the edge of the base to one end. The base (251) is also provided with a protrusion (253) that protrudes axially to the other end.

10. A water pump, comprising a pump body (30), a stator (40) fixed to the pump body, a pump cover (50), an impeller (60), and a plastic-encapsulated rotor assembly as described in any one of claims 1-9, characterized in that: The impeller (60) is disposed on one axial side of the encapsulated rotor assembly, and the pump body (30) includes a cylindrical pump inner shell (31), and the encapsulated rotor assembly is rotatably mounted in the inner cavity of the pump inner shell (31).

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