Inner rotor structure

Abstract

The utility model discloses an inner rotor structure, comprising a metal shaft; the metal core sleeves the middle part of the metal shaft; the plurality of magnetic parts are arranged on the metal core in an array around the axis of the metal core, the magnetic parts are arc-shaped, and the inner surfaces of the magnetic parts are attached to the outer surface of the metal core; the gasket is arranged on the metal shaft in a penetrating mode, and a forming gap is formed between the side, facing the metal core, of the gasket and the metal core; the insulating layer wraps the periphery of the integral structure formed by the metal core and the plurality of magnetic parts, part of the insulating layer fills the forming gap, and the insulating layer wraps at least part of the outer circumferential surface of the gasket; wherein the gasket is configured to abut against an ejection mechanism in the mold during injection molding of the insulating layer. According to the utility model, the cracking of the insulating layer can be avoided, the demoulding of the inner rotor structure is facilitated, the sealing of the internal structure of the inner rotor can be realized, and the oxidation of the inner rotor can be effectively prevented.

Description

Technical Field

[0001] The utility model relates to the field of inner rotors, in particular to an inner rotor structure. Background Art

[0002] An inner rotor is a specific type of electric motor rotor that rotates inside the motor, where the electric field creates a rotational torque that causes the inner rotor to rotate. This type of motor is commonly used in small electrical appliances such as electric fans, vacuum cleaners, etc.

[0003] The inner rotor usually includes a metal core, a metal shaft, a magnetic part and an insulating layer. The metal core is inserted into the metal shaft, the magnetic part is located on the outer circumference of the metal core, and the insulating layer is wrapped around the outer periphery of the overall structure formed by the metal core and the magnetic part. During processing, the installed metal core, metal shaft and magnetic part need to be placed in the injection mold as an insert, and an insulating layer is formed after injection molding. After the injection molding is completed, the ejection mechanism of the existing mold will use multiple ejectors to push against the bottom surface of the insulating layer to eject the inner rotor as a whole out of the mold for demolding and unloading. However, the ejection action of the ejection mechanism can easily cause the insulation layer to rupture, thereby affecting the quality of the inner rotor insulation layer, making the inner rotor easy to oxidize during subsequent use. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes an inner rotor structure, which can facilitate demoulding of the inner rotor after injection molding and ensure the quality of the insulation layer of the inner rotor after demoulding.

[0005] According to an embodiment of the utility model, an inner rotor structure includes: a metal shaft; a metal core, which is sleeved on the middle part of the metal shaft; a plurality of magnetic parts, which are arranged on the metal core in an array around the axis of the metal core, the magnetic parts are arc-shaped and the inner surfaces are in contact with the outer surface of the metal core; a gasket, which is passed through the metal shaft, and a molding gap is formed between the side of the gasket facing the metal core and the metal core; an insulating layer, which is wrapped around the periphery of the overall structure composed of the metal core and the plurality of magnetic parts, part of the insulating layer fills the molding gap, and the insulating layer wraps at least part of the outer circumferential surface of the gasket; wherein the gasket is configured to be abutted by an ejection mechanism in the mold when the insulating layer is injection molded.

[0006] At least the following beneficial effects are achieved: in the inner rotor structure of the utility model, since a gasket structure is provided, during demoulding, the ejection mechanism in the mold can abut against the end surface of the gasket without directly abutting against the insulating layer, thereby avoiding the rupture of the insulating layer, facilitating the demoulding of the inner rotor structure, and achieving sealing of the internal structure of the inner rotor, thereby effectively preventing oxidation of the inner rotor.

[0007] According to some embodiments of the utility model, two threaded segments are provided on the metal shaft, and the two threaded segments are respectively located on the outside of the two end surfaces of the metal core, the gasket is annular, and the inner ring diameter of the gasket is larger than the outer diameter of the metal shaft, and the insulating layer wraps the two threaded segments.

[0008] According to some embodiments of the utility model, the gasket includes an annular body and a plurality of gaskets uniformly arrayed circumferentially around the body, the gaskets are located on the end surface of the body facing the metal core, and a first flow gap is provided between adjacent gaskets, the first flow gap extends radially along the body and is used to fill part of the insulating layer.

[0009] According to some embodiments of the present invention, a second circulation gap is further provided on the cushion block, and the second circulation gap is connected to the two first circulation gaps located on both sides of the cushion block.

[0010] According to some embodiments of the utility model, the outer circumferential surface of the metal core is provided with a plurality of protrusions arrayed around the axis of the metal core, the protrusions extend along the axial direction of the metal core, and the plurality of magnetic members can be respectively placed between a plurality of adjacent groups of the protrusions.

[0011] According to some embodiments of the present invention, both sides of the protrusion have recessed portions recessed toward the inside of the metal core, and the recessed portions extend along the axial direction of the metal core and penetrate the metal core along the axial direction of the metal core.

[0012] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The present invention is further described below with reference to the accompanying drawings and embodiments, wherein:

[0014] Figure 1 It is a structural schematic diagram of the existing inner rotor mentioned in the background technology;

[0015] Figure 2 This is a schematic diagram of the structure of an embodiment of the utility model;

[0016] Figure 3 for Figure 2 A schematic diagram of the cross-sectional structure after cutting along the plane where the axis of the metal shaft is located;

[0017] Figure 4 for Figure 3 A schematic diagram of the local enlarged structure at point A in the middle;

[0018] Figure 5This is a schematic diagram of the structure of an embodiment of the utility model after the metal shaft and the insulating layer are hidden;

[0019] Figure 6 This is a structural schematic diagram of a gasket in an embodiment of the utility model;

[0020] Figure 7 This is a schematic structural diagram of a metal core according to an embodiment of the utility model.

[0021] Figure Number:

[0022] Metal shaft 100, threaded section 110;

[0023] Metal core 200, protrusion 210, recess 220;

[0024] Magnetic member 300;

[0025] Gasket 400, body 410, cushion block 420, first flow gap 430, second flow gap 440;

[0026] Insulation layer 500;

[0027] The molding gap is 600. DETAILED DESCRIPTION

[0028] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0029] In the description of the utility model, if there is a description of first and second, it is only for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0030] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0031] Reference Figures 2 to 7 The utility model discloses an inner rotor structure, including a metal shaft 100 , a metal core 200 , a gasket 400 , an insulating layer 500 and a plurality of magnetic parts 300 .

[0032] Among them, the metal core 200 is sleeved on the middle part of the metal shaft 100, and multiple magnetic parts 300 are arranged on the metal core 200 in an array around the axis of the metal core 200. The magnetic parts 300 are arc-shaped and the inner surface is in contact with the outer surface of the metal core 200. The gasket 400 is passed through the metal shaft 100, and a molding gap 600 is formed between the gasket 400 and the metal core 200 on the side facing the metal core 200. The insulating layer 500 is wrapped around the periphery of the overall structure composed of the metal core 200 and the multiple magnetic parts 300. Part of the insulating layer 500 fills the molding gap 600. The insulating layer 500 wraps at least part of the outer circumferential surface of the gasket 400, and the gasket 400 is configured to be pushed against by the ejection mechanism in the mold when the insulating layer 500 is injection molded.

[0033] It is understandable that if Figure 1 As shown, in the existing inner rotor structure, the insulating layer 500 completely wraps the outer surface and two end faces of the whole formed by the metal core 200 and the magnetic member 300 after injection molding. Therefore, when the ejection mechanism on the mold pushes the end faces of the insulating layer 500 through multiple ejector pins to eject the inner rotor as a whole out of the mold, since the insulating layer 500 has not been completely cooled and hardened at this time, the pushing action of the ejection mechanism is likely to cause the insulating layer 500 to rupture, and then in subsequent use, it will cause the inside of the insulating layer 500 to be corroded or oxidized. In the inner rotor structure of the utility model, since the gasket 400 structure is provided, when demolding, the ejection mechanism in the mold can push the end face of the gasket 400 without directly pushing the insulating layer 500, so that the rupture of the insulating layer 500 can be avoided, which is conducive to the demolding of the inner rotor structure, and the sealing of the internal structure of the inner rotor can be achieved, thereby effectively preventing the oxidation of the inner rotor.

[0034] Furthermore, if Figure 3 and Figure 4 As shown, since a molding gap 600 is formed between the gasket 400 and the metal core 200, during the injection molding process, the raw material of the insulating layer 500 will flow into the molding gap 600, thereby connecting the gasket 400 and the metal core 200 after the insulating layer 500 is solidified. In addition, the insulating layer 500 also wraps at least a portion of the outer circumferential surface of the gasket 400, which can further enhance the wrapping strength of the gasket and prevent the gasket 400 from loosening.

[0035] It should be noted that the insulating layer 500 may be made of plastic material, the metal shaft 100 may be an iron shaft, and the metal core 200 may be an iron core.

[0036] In the embodiments of the present invention, Figure 3As shown, two thread segments 110 are provided on the metal shaft 100, and the two thread segments 110 are respectively located on the outer sides of the two end surfaces of the metal core 200, the gasket 400 is annular, and the inner diameter of the gasket 400 is larger than the outer diameter of the metal shaft 100, and the insulating layer 500 wraps the two thread segments 110. When the insulating layer 500 is formed in the mold, the liquid insulating layer 500 raw material can flow to the position of the thread segment 110 and fill the thread segment 110, so as to wrap the thread segment 110 after the insulating layer 500 is cooled and formed, thereby increasing the wrapping strength of the insulating layer 500 on the metal shaft 100, so that the inner rotor structure is more stable as a whole.

[0037] like Figure 6 As shown, in the embodiment of the present utility model, the gasket 400 includes a ring-shaped body 410 and a plurality of gaskets 420 uniformly arrayed around the body 410. The gaskets 420 are located on the end surface of the body 410 facing the metal core 200. There is a first flow gap 430 between adjacent gaskets 420. The first flow gap 430 extends along the radial direction of the body 410 and is used to fill a part of the insulating layer 500. During installation, the gaskets 420 on the gasket 400 can fit the end surface of the metal core 200, so as to form a molded gap 600 between the end surface of the metal core 200 and the body 410 of the gasket 400. The molded gap 600 can also be regarded as a gap enclosed by the first flow gap 430 and the end surface of the metal core 200 for the raw materials of the insulating layer 500 to flow in.

[0038] like Figure 6 As shown, in the embodiment of the utility model, the spacer 420 is further provided with a second flow gap 440, and the second flow gap 440 is connected to the two first flow gaps 430 located on both sides of the spacer 420. By providing the first flow gap 430 and the second flow gap 440, the raw material of the insulating layer 500 can flow in both radial and circumferential directions of the spacer 400 and fill the gap between the spacer 400 and the end surface of the metal core 200.

[0039] like Figure 5 and Figure 7 As shown, in the embodiment of the utility model, the outer circumferential surface of the metal core 200 is provided with a plurality of protrusions 210 arranged around the axis of the metal core 200, the protrusions 210 extend along the axial direction of the metal core 200, and the plurality of magnetic members 300 can be respectively disposed between a plurality of adjacent groups of protrusions 210. The protrusions 210 can limit the magnetic members 300, preventing the magnetic members 300 from moving in the circumferential direction of the metal core 200.

[0040] like Figure 5As shown, in the embodiment of the present invention, both sides of the protrusion 210 have recessed portions 220 recessed into the metal core 200, and the recessed portions 220 extend along the axial direction of the metal core 200 and penetrate the metal core 200 along the axial direction of the metal core 200. During the injection molding process of the insulating layer 500, part of the liquid raw material of the insulating layer 500 will flow into the recessed portions 220, thereby increasing the tightness of the overall structure of the inner rotor after being wrapped by the insulating layer 500.

[0041] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0042] Of course, the present invention is not limited to the above-mentioned embodiments, and technicians familiar with the field may make equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. An inner rotor structure, characterized in that: include: Metal shaft; A metal core, sleeved on the middle part of the metal shaft; A plurality of magnetic members are arranged in an array around the axis of the metal core on the metal core, wherein the magnetic members are arc-shaped and the inner surfaces thereof are in contact with the outer surface of the metal core; A gasket is inserted into the metal shaft, and a forming gap is formed between the side of the gasket facing the metal core and the metal core; An insulating layer wrapped around the periphery of the integral structure composed of the metal core and the plurality of magnetic members, a portion of the insulating layer filling the molding gap, and the insulating layer wrapping at least a portion of the outer circumferential surface of the gasket; Wherein, the gasket is configured to be abutted by an ejection mechanism in the mold when the insulating layer is injection molded.

2. An inner rotor structure according to claim 1, characterized in that: The metal shaft is provided with two threaded sections, which are respectively located on the outside of the two end faces of the metal core. The gasket is annular, and the inner ring diameter of the gasket is larger than the outer diameter of the metal shaft. The insulating layer wraps the two threaded sections.

3. The inner rotor structure according to claim 1, characterized in that: The gasket includes an annular body and a plurality of gaskets arranged uniformly around the body. The gaskets are located on the end surface of the body facing the metal core. There is a first flow gap between adjacent gaskets. The first flow gap extends radially along the body and is used to fill part of the insulating layer.

4. An inner rotor structure according to claim 3, characterized in that: The cushion block is also provided with a second circulation gap, and the second circulation gap is connected with the two first circulation gaps located on both sides of the cushion block.

5. The inner rotor structure according to claim 1, characterized in that: The outer circumferential surface of the metal core is provided with a plurality of protrusions arranged in an array around the axis of the metal core, and the protrusions extend along the axial direction of the metal core. The plurality of magnetic members can be respectively and correspondingly placed between a plurality of adjacent groups of the protrusions.

6. An inner rotor structure according to claim 5, characterized in that: Both sides of the protrusion have recessed parts recessed toward the inside of the metal core, and the recessed parts extend along the axial direction of the metal core and penetrate the metal core along the axial direction of the metal core.

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