A rotor assembly

Abstract

The utility model discloses a rotor assembly with graphite bearing, include: rotor body, graphite bearing and magnetic core, the magnetic core and graphite bearing as the insert with the rotor body integral injection molding, the rotor body includes the hollow columnar bearing support cavity for installing graphite bearing, the magnetic core plastic package in the bearing support cavity outside wall of rotor body, its characterized in that, the graphite bearing is sectional, including not less than 2 section's split bearing axial combination and plastic package in the bearing support cavity inboard wall of rotor body, the length of split bearing is L, and L is less than 12mm, can reduce rotor assembly manufacturing cost while keeping the concentricity of graphite bearing and impeller.

Description

Technical Field

[0001] This utility model relates to a rotor assembly. The IPC classification number may be H02K 1 / 27 or H02K 15 / 03. Background Technology

[0002] Currently, the rotor assembly in an electronic water pump is the part that outputs kinetic energy. The rotor assembly generally consists of a magnetic core providing magnetic attraction, a stamped iron core, a bearing for support, and an injection-molded plastic body. The bearing that provides support in the water pump is typically a graphite bearing. This type of graphite bearing is usually a single long cylinder or two smaller cylinders assembled into a long hollow shaft. The long cylindrical structure of the graphite bearing has a higher material content and a longer dimension, making it difficult to use a molding process. It can only be machined from large square materials, resulting in higher costs. Furthermore, the two smaller cylindrical structures need to be assembled into a long hollow steel shaft, increasing assembly costs and making it difficult to control concentricity. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a rotor assembly that can maintain the concentricity of the graphite bearing and the impeller while reducing the manufacturing cost of the rotor assembly.

[0004] In a first aspect, this utility model provides a rotor assembly, comprising: a rotor body, a graphite bearing, and a magnetic core. The magnetic core and the graphite bearing are integrally injection molded with the rotor body as inserts. The rotor body includes a hollow cylindrical bearing support cavity for mounting the graphite bearing. The magnetic core is plastic-sealed on the outer wall of the bearing support cavity of the rotor body. The graphite bearing is segmented, comprising at least two separate bearing segments that are axially assembled and plastic-sealed on the inner wall of the bearing support cavity of the rotor body. The length of the first separate bearing and the second separate bearing is L, and <12mm.

[0005] The rotor assembly according to the present invention has at least the following beneficial effects: Since the length of the first split bearing and the second split bearing is less than 12mm, the graphite bearing of this length can be molded by pressing the two segmented graphite bearings into shape before injection molding the entire rotor assembly, which greatly reduces the cost. The inner hole of the molded graphite bearing is accurate. During the injection molding of the rotor body, the first split bearing and the second split bearing can directly cooperate with the insert pin of the mold due to the accurate inner hole, ensuring better concentricity between the inner hole of the injection-molded graphite bearing and the outer diameter of the rotor body.

[0006] According to some embodiments of this utility model, the graphite bearing is divided into two sections, namely a first split bearing and a second split bearing. The overall length of the graphite bearing does not exceed 24mm, saving materials and reducing costs. Furthermore, the two-section split bearing is easier to mold, resulting in higher material utilization.

[0007] According to some embodiments of the present invention, the first split bearing and the second split bearing are axially combined through a joint, which is used to prevent the graphite bearing from leaking during plastic sealing.

[0008] According to some embodiments of this utility model, the joint portion is a concave-convex shoulder structure, wherein the inner shoulder of the first split bearing is recessed and the outer shoulder is protruding; the inner shoulder of the second split bearing is protruding and the outer shoulder is recessed, and the protrusion and recess cooperate with each other to assemble the first split bearing and the second split bearing. This concave-convex shoulder structure can prevent glue leakage when the first split bearing and the second split bearing are plastic-sealed.

[0009] According to some embodiments of this utility model, the joint adopts an interlocking structure to combine the first split bearing and the second split bearing. This interlocking structure can prevent glue leakage during the encapsulation of the first split bearing and the second split bearing.

[0010] According to some embodiments of this utility model, the outer walls of the first and second split bearings near the joint are provided with concave surfaces. During injection molding of the rotor body, the inner wall of the bearing support cavity forms a convex surface corresponding to the concave surface to fix the graphite bearing. This provides a more secure fixation of the graphite bearing and prevents slippage during rotation.

[0011] According to some embodiments of the present invention, the end face of the magnetic core is provided with a first annular inclined surface inclined to the central hole. The first annular inclined surface is uniformly distributed with protrusions along the circumference. When the rotor body is injection molded, the outer wall of the bearing support cavity forms a second annular inclined surface and a concave point corresponding to the first annular inclined surface and the protrusions, so as to fix the magnetic core and provide torque to the rotor body. Attached Figure Description

[0012] The accompanying drawings are provided to further understand the technical solution of this utility model and constitute a part of the specification. They are used together with the embodiments of this utility model to explain the technical solution of this utility model, and do not constitute a limitation on the technical solution of this utility model.

[0013] Figure 1 This is an overall schematic diagram of a rotor assembly provided in one embodiment of the present invention;

[0014] Figure 2 yes Figure 1 A side view of the rotor assembly is shown.

[0015] Figure 3 yes Figure 2 The rotor assembly is shown in AA cross-sectional view;

[0016] Figure 4 yes Figure 2 A cross-sectional view (AA) of another embodiment of the rotor assembly is shown;

[0017] Figure 5 yes Figure 3 The diagram shows the overall configuration of the second split bearing.

[0018] Figure 6 yes Figure 4 The diagram shows the overall configuration of the second split bearing.

[0019] Figure 7 yes Figure 3 A schematic diagram of the graphite bearing is shown below;

[0020] Figure 8 yes Figure 3 A schematic diagram of the overall magnetic core is shown;

[0021] Figure 9 yes Figure 1 A schematic diagram of the rotor body without the impeller cover is shown.

[0022] Icon labels:

[0023] Rotor body 100; bearing support cavity 110; convex surface 120; second annular inclined surface 130; concave point 140; impeller 150; water inlet 151; blade 152; impeller cover 153;

[0024] Graphite bearing 200; First split bearing 210; Second split bearing 220; Joint 230; Inner shoulder 231; Outer shoulder 232; Annular tooth 233; Concave surface 240;

[0025] Magnetic core 300; first annular inclined surface 310; protrusion 320. Detailed Implementation

[0026] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0027] In the description of this utility model, it should be understood that the orientation descriptions, such as up, down, etc., are based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0028] In the description of this utility model, "multiple" refers to two or more. The use of "first" and "second" is for distinguishing technical features only and should not be construed as indicating or implying relative importance, or implicitly indicating the number of technical features or their sequential relationship.

[0029] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0030] Reference Figures 1 to 4The rotor assembly includes a rotor body 100 with an impeller 150, a hollow cylindrical graphite bearing 200 for supporting the rotor body 100, and a magnetic core 300 for providing magnetic attraction. The magnetic core 300 and the graphite bearing 200 are integrally injection molded with the rotor body 100 as inserts. The rotor body 100 includes a hollow cylindrical bearing support cavity 110 for mounting the graphite bearing 200. The magnetic core 300 is encapsulated on the outer wall of the bearing support cavity 110 of the rotor body 100. The graphite bearing 200 is a segmented graphite bearing 200, including at least two segments of split bearings. For example, the graphite bearing 200 is divided into two segments, namely a first split bearing 210 and a second split bearing 220. After the first split bearing 210 and the second split bearing 220 are axially combined, they are encapsulated on the inner wall of the bearing support cavity 110 of the rotor body 100. The length of the first split bearing 210 and the second split bearing 220 is L, and the length L is less than 12 mm. Specifically, the traditional long cylindrical graphite bearing 200 requires machining a large square material to form a long cylindrical structure, resulting in a lot of processing waste and high costs. In this embodiment, the graphite bearing 200 is transformed from a traditional long cylindrical structure into two short structures, namely a first split bearing 210 and a second split bearing 220. The first split bearing 210 and the second split bearing 220 can be formed by compression molding, with a length not exceeding 12mm. Then, the first split bearing 210 and the second split bearing 220 are combined and plastic-sealed into the inner wall of the bearing support cavity 110 of the rotor pump body. The structure is simple, the overall length of the graphite bearing 200 does not exceed 24mm, and the two split bearings are easier to form by compression molding, with higher material utilization and greatly reduced cost. Moreover, the first split bearing 210 and the second split bearing 220 formed by compression molding have accurate inner hole precision. When the rotor body 100 is injection molded, they can directly cooperate with the insert pin of the mold, ensuring better concentricity between the inner hole of the injection molded graphite bearing 200 and the outer diameter of the rotor body 100.

[0031] refer to Figures 2 to 6The first split bearing 210 and the second split bearing 220 are axially combined through a joint 230 to form a graphite bearing 200. This joint 230 is configured as a concave-convex shoulder structure or an interlocking structure. Specifically, the concave-convex shoulder structure can be configured such that the inner shoulder 231 of the first split bearing 210 is recessed and the outer shoulder 232 is protruding, while the inner shoulder 231 of the second split bearing 220 is protruding and the outer shoulder 232 is recessed. The inner and outer shoulders 232 of the first split bearing 210 and the inner and outer shoulders 232 of the second split bearing 220 cooperate with each other to form the graphite bearing 200. When the graphite bearing 200 is encapsulated, this effectively prevents glue leakage and improves the smoothness of the inner bore of the graphite bearing 200. The meshing structure is formed by providing annular teeth 233 for meshing on the end faces of the first split bearing 210 and the second split bearing 220. The two split bearings mesh through the annular teeth 233 to form a graphite bearing 200. When the graphite bearing 200 is encapsulated, the annular teeth 233 can effectively prevent glue leakage.

[0032] Understandably, the concave-convex shoulder structure can also be configured such that the inner shoulder 231 of the first split bearing 210 is protruding and the outer shoulder 232 is recessed, and the inner shoulder 231 of the second split bearing 220 is recessed and the outer shoulder 232 is protruding, as long as the protrusions and recesses can be combined to form a graphite bearing 200.

[0033] It is understandable that the segmented graphite bearing 200 can also be divided into 3 segments. The two segments of the middle graphite bearing 200 have corresponding joints 230 for combination, and the overall length of the graphite bearing does not exceed 24mm. This application does not specifically limit the number of segments of the graphite bearing 200. In this application, it is preferred to have 2 segments.

[0034] refer to Figures 5 to 7 The outer walls of the first split bearing 210 and the second split bearing 220 near the joint 230 are provided with concave surfaces 240. When the rotor body 100 is injection molded, the inner wall of the bearing support cavity 110 forms a convex surface 120 corresponding to the concave surface 240, thereby fixing the first split bearing 210 and the second split bearing 220. The concave surface 240 can also drive the graphite bearing 200 to rotate, preventing the graphite bearing 200 and the rotor body 100 from slipping.

[0035] Understandably, the outer sidewalls of the first split bearing 210 and the second split bearing 220 can also be configured as convex surfaces. When the rotor body 100 is injection molded, the inner sidewall of the bearing support cavity 110 forms a concave surface corresponding to the convex surface, thereby fixing the first split bearing 210 and the second split bearing 220. The effect achieved is the same as setting the concave surface 240 on the outer sidewalls of the first split bearing 210 and the second split bearing 220.

[0036] refer to Figure 8 and Figure 9The end face of the magnetic core 300 is provided with a first annular inclined surface 310 that is inclined towards the central hole. The first annular inclined surface 310 has evenly distributed recesses 140 along its circumference. During injection molding, the outer wall of the bearing support cavity 110 of the rotor body 100 forms a second annular inclined surface 130 corresponding to the first annular inclined surface 310 and recesses 140 corresponding to the protrusions 320, thereby fixing the rotor body 100 and the magnetic core 300. Specifically, the magnetic core 300 can be pushed to rotate when an external coil is energized, and the rotor body 100 is driven to rotate together by the torque provided by the protrusions 320.

[0037] It is understood that the number of protrusions 320 can be set as needed. This application does not specifically limit the number of protrusions 320. In this embodiment, the number of protrusions 320 is preferably 6.

[0038] refer to Figure 1 and Figure 9 The rotor body 100 also includes an impeller 150. The top of the impeller 150 is provided with a water inlet 151 and an impeller cover 153. The impeller 150 is also provided with spiral blades 152. When the rotor assembly rotates under the drive of the external coil, the coolant enters from the water inlet 151. The spiral blades 152 can reduce the flow resistance and separate solid particles in the coolant from the liquid, thereby improving the stability of the rotor assembly operation.

[0039] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A rotor assembly with a graphite bearing (200), comprising: The rotor body (100), graphite bearing (200), and magnetic core (300) are integrally injection molded with the rotor body (100) as inserts. The rotor body (100) includes a hollow cylindrical bearing support cavity (110) for mounting the graphite bearing (200). The magnetic core (300) is encapsulated on the outer side wall of the bearing support cavity (110) of the rotor body (100). The graphite bearing (200) is segmented, comprising at least two separate bearing segments axially combined and encapsulated on the inner side wall of the bearing support cavity (110) of the rotor body (100). The length of the separate bearing is L, and L < 12 mm.

2. The rotor assembly according to claim 1, characterized in that, The graphite bearing (200) is divided into two sections, namely the first split bearing (210) and the second split bearing (220).

3. The rotor assembly according to claim 2, characterized in that, The split bearings are axially assembled through a joint (230).

4. The rotor assembly according to claim 3, characterized in that, The joint (230) has a concave-convex shoulder structure, with the inner shoulder (231) of the first split bearing (210) being recessed and the outer shoulder (232) being protruding; the inner shoulder (231) of the second split bearing (220) is protruding and the outer shoulder (232) is recessed. The protrusion and the recess cooperate with each other to combine the first split bearing (210) and the second split bearing (220).

5. The rotor assembly according to claim 3, characterized in that, The joint (230) adopts an interlocking structure to combine the first split bearing (210) and the second split bearing (220).

6. The rotor assembly according to claim 3, characterized in that, The outer walls of the first split bearing (210) and the second split bearing (220) near the joint (230) are provided with concave surfaces (240). When the rotor body (100) is injection molded, the inner wall of the bearing support cavity (110) forms a convex surface (120) corresponding to the concave surface (240) to fix the graphite bearing (200).

7. The rotor assembly according to claim 1, characterized in that, The end face of the magnetic core (300) is provided with a first annular inclined surface (310) inclined to the center hole. The first annular inclined surface (310) is uniformly distributed with protrusions (320) in the circumferential direction. When the rotor body (100) is injection molded, the outer wall of the bearing support cavity (110) forms a second annular inclined surface (130) and a concave point (140) corresponding to the first annular inclined surface (310) and the protrusions (320) to fix the magnetic core (300).

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