Rotor insulating coating coating structure

Abstract

The utility model discloses a rotor insulating coating coating structure which comprises a rotor iron core, a rotating shaft and a lining. The rotor core is provided with a rotating shaft mounting hole; the rotating shaft is mounted in the rotating shaft mounting hole; the bushing is provided with a connecting hole and a first surface attached to the rotor core, the connecting hole is connected to the rotating shaft in a sleeving manner, the bushing and the rotating shaft are surrounded by a deflation space, and the deflation space is communicated with the rotating shaft mounting hole and the outside and guides hot air in the rotating shaft mounting hole to flow; the hot air is prevented from pushing the bushing to move so as to form a gap between the first surface and the rotor core, and is blown to the insulating coating through the gap, so that bubbles on the surface of the insulating coating are effectively prevented, and the coating effect of the insulating coating of the rotor is greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, and in particular to a rotor insulation coating structure. Background Technology

[0002] An electric motor typically includes a rotor and a stator. The rotor consists of stacked silicon steel sheets and a shaft inserted into the silicon steel sheets. To reduce hysteresis losses and prevent the silicon steel sheets from conducting electricity directly and causing local short circuits, an insulating coating is usually applied to the silicon steel sheets.

[0003] In related technologies, to prevent the insulating coating from affecting the assembly function of the shaft, a cylindrical bushing is usually fitted on the shaft. One end of the bushing abuts against the silicon steel sheet. Since the coating of the insulating coating needs to be carried out in a high-temperature environment, the air in the fit gap between the shaft and the silicon steel sheet is heated and discharged, pushing against the bushing, so that a gap is formed between the bushing and the silicon steel sheet. Hot air blows from the gap to the insulating coating, forming bubbles and damaging the insulating coating. Utility Model Content

[0004] 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 insulation coating structure that can discharge air between the rotor shaft and the rotor core from the venting space, thereby protecting the insulation coating.

[0005] This utility model embodiment provides a rotor insulation coating structure, including:

[0006] The rotor core is equipped with shaft mounting holes;

[0007] A rotating shaft is installed in the rotating shaft mounting hole;

[0008] The bushing has a connecting hole and a first surface that fits against the rotor core. The connecting hole is fitted onto the rotating shaft. The bushing and the rotating shaft surround a venting space, which connects the rotating shaft mounting hole to the outside.

[0009] According to some embodiments of the present invention, at least a portion of the connecting hole is a polygonal hole, the sidewall of the polygonal hole is tangent to the rotating shaft, and the polygonal hole constitutes part of the venting space.

[0010] According to some embodiments of the present invention, the bushing includes a first sleeve and a second sleeve, a first end of the first sleeve is provided with the first surface, a second end is connected to the second sleeve, and the second sleeve is provided with the polygonal hole;

[0011] A first clearance space is formed between the first sleeve, the rotating shaft, and the rotor core, surrounding the mounting hole of the rotating shaft. The first clearance space connects the mounting hole of the rotating shaft and the polygonal hole.

[0012] According to some embodiments of this utility model, the inner diameter of the first sleeve is larger than the diameter of the shaft mounting hole.

[0013] According to some embodiments of the present invention, the bushing further includes a third sleeve, the third sleeve and the first sleeve being respectively connected to the two ends of the second sleeve, and a shoulder extending in a direction away from the axis of rotation is formed between the third sleeve and the second sleeve.

[0014] According to some embodiments of the present invention, a second clearance space is provided between the third sleeve and the rotating shaft, surrounding the rotating shaft.

[0015] According to some embodiments of the present invention, the outer surfaces of the first sleeve, the second sleeve, and the third sleeve are cylindrical surfaces.

[0016] According to some embodiments of the present invention, the bushing is provided with a chamfered portion that transitions to the first surface.

[0017] According to some embodiments of the present invention, the cross-section of the polygonal hole is a regular polygon.

[0018] The present invention has at least the following beneficial effects: by setting a venting space to guide the flow of hot air in the shaft mounting hole, the hot air is prevented from pushing the bushing to move and causing a gap between the first surface and the rotor core, and is blown through the gap to the insulating coating, which effectively prevents the generation of bubbles on the surface of the insulating coating and greatly improves the coating effect of the rotor's insulating coating.

[0019] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0020] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0021] Figure 1 This is a schematic diagram of the rotor insulation coating structure according to an embodiment of the present invention;

[0022] Figure 2 This is a cross-sectional view of the rotor insulation coating structure according to an embodiment of the present invention;

[0023] Figure 3 for Figure 2 A magnified view of part A in the middle;

[0024] Figure 4 This is a half-sectional view of the bushing according to an embodiment of the present utility model.

[0025] Figure label:

[0026] 100. Rotor core; 110. Shaft mounting hole;

[0027] 200. Shaft;

[0028] 300, Bushing; 310, Connecting hole; 320, First sleeve; 321, First surface; 322, First clearance space; 330, Second sleeve; 331, Polygonal hole; 340, Third sleeve; 341, Second clearance space. Detailed Implementation

[0029] 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.

[0030] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying 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.

[0031] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first," "second," etc., are used in the description, they are only for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the sequential relationship of the indicated technical features.

[0032] In the description of this utility model, unless otherwise explicitly defined, the terms "setting", "installation", "connection", etc. 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 combination with the specific content of the technical solution.

[0033] Please refer to Figures 1 to 3As shown, this utility model embodiment provides a rotor insulation coating structure, including a rotor core 100, a rotating shaft 200, and a bushing 300; the rotor core 100 is provided with a rotating shaft mounting hole 110; the rotating shaft 200 is mounted in the rotating shaft mounting hole 110; the bushing 300 is provided with a connecting hole 310 and a first surface 321 that fits against the rotor core 100, the connecting hole 310 is sleeved on the rotating shaft 200, and the bushing 300 and the rotating shaft 200 surround a venting space, which connects the rotating shaft mounting hole 110 to the outside.

[0034] According to the rotor insulation coating structure of this utility model embodiment, before applying the insulation coating, the bushing 300 is fitted onto the rotating shaft 200, and the first surface 321 of the bushing 300 is attached to the rotor core 100 to prevent the insulation coating from being applied to the assembly functional surface of the rotating shaft 200 and affecting the external components of the rotating shaft 200. After the coating is completed, the rotor insulation coating structure is placed in a high-temperature environment to heat and cure the insulation coating. During the heating process, the air in the rotating shaft mounting hole 110 is heated and released from the opening of the rotating shaft mounting hole 110, and discharged to the outside through the venting space.

[0035] It should be noted that the bushing 300 in the relevant technology is usually cylindrical. The bushing 300 and the rotating shaft 200 fit tightly. Therefore, the air in the rotating shaft mounting hole 110 will be discharged when heated and push against the bushing 300, so that a gap is formed between the bushing 300 and the rotor core 100. The hot air blows from the gap to the insulating coating, causing bubbles to form on the surface of the insulating coating and destroying the insulation effect.

[0036] According to the rotor insulation coating structure of this utility model embodiment, by setting an air venting space to guide the flow of hot air in the shaft mounting hole 110, the hot air is prevented from pushing the bushing 300 to move and causing a gap between the first surface 321 and the rotor core 100, and is blown towards the insulation coating through the gap, which effectively prevents the generation of bubbles on the surface of the insulation coating and greatly improves the coating effect of the rotor insulation coating.

[0037] In this embodiment, the venting space can be configured in various shapes, such as channels or through holes. The channels can be formed by the mating of the inner walls of the rotating shaft 200 and the bushing 300. The vent outlet of the venting space can be located on any surface of the bushing 300 other than the first surface 321.

[0038] In this embodiment, it can be understood that when the rotating shaft 200 is placed vertically, there is no need to contact and fix the bushing 300 with the rotating shaft 200. Under the action of the bushing 300's own weight, it can be stably sleeved on the rotating shaft 200 and the first surface 321 can be attached to the rotor core 100.

[0039] In some embodiments, combined with Figure 3 and Figure 4As shown, at least a portion of the connecting hole 310 is a polygonal hole 331, the sidewall of which is tangent to the rotating shaft 200, and the polygonal hole 331 constitutes a partial venting space.

[0040] In this embodiment, the bushing 300 and the rotating shaft 200 are fixed by the side wall of the polygonal hole 331 being tangent to the rotating shaft 200. The tangent arrangement makes the contact surface between the side wall of the polygonal hole 331 and the surface of the rotating shaft 200 multiple straight lines, thereby increasing the volume of the venting space by reducing the contact surface, and thus improving the venting effect.

[0041] In this embodiment, the polygonal hole 331 can be a regular hexagon; in other embodiments, it can also be a triangle, a square, etc.

[0042] In some embodiments, combined with Figure 3 and Figure 4 As shown, the bushing 300 includes a first sleeve 320 and a second sleeve 330. The first end of the first sleeve 320 is provided with a first surface 321, and the second end is connected to the second sleeve 330. The second sleeve 330 is provided with a polygonal hole 331. A first clearance space 322 is formed between the first sleeve 320, the rotating shaft 200 and the rotor core 100, surrounding the rotating shaft mounting hole 110. The first clearance space 322 connects the rotating shaft mounting hole 110 and the polygonal hole 331.

[0043] In this embodiment, hot air is discharged from the rotating shaft mounting hole 110 through the first clearance space 322 and the polygonal hole 331. Thanks to the annular first clearance space 322, hot air released from any position of the opening of the rotating shaft mounting hole 110 can be discharged through the polygonal hole 331, thus improving the exhaust effect.

[0044] In some embodiments, combined with Figure 3 and Figure 4 As shown, the inner diameter of the first sleeve 320 is larger than the diameter of the shaft mounting hole 110. That is, the inner wall of the first sleeve 320 is a cylindrical surface and is coaxially set with the shaft mounting hole 110. The cylindrical surface facilitates production and also corresponds to the opening of the shaft mounting hole 110, avoiding local gas concentration and poor exhaust.

[0045] In some embodiments, combined with Figure 3 and Figure 4As shown, the bushing 300 also includes a third sleeve 340, which is connected to both ends of the second sleeve 330, along with the first sleeve 320. A shoulder extending in a direction away from the axis of the rotating shaft 200 is formed between the third sleeve 340 and the second sleeve 330. That is, the third sleeve 340 and the second sleeve 330 form an approximate stepped shaft structure, and the outer perimeter of the cross-section of the third sleeve 340 is greater than that of the second sleeve 330. This forms an umbrella-shaped structure at the end of the bushing 300 away from the rotor core 100, so that when the insulating coating is applied, the insulating coating is blocked by the third sleeve 340 and will not be applied to the rotating shaft 200. This also allows the bushing 300 to protect the rotating shaft 200 without having to cover it completely, effectively reducing the volume of the bushing 300.

[0046] In some embodiments, combined with Figure 3 and Figure 4 As shown, a second clearance space 341 is provided between the third sleeve 340 and the rotating shaft 200, surrounding the rotating shaft 200. Workers can remove and install the bushing 300 by clamping the third sleeve 340. The second clearance space 341 prevents the clamping force from directly acting on the rotating shaft 200, providing better protection. If necessary, flaring pliers can be inserted into the clearance space to enlarge the connecting hole 310, facilitating the removal and installation of the bushing 300.

[0047] In some embodiments, combined with Figure 3 and Figure 4 As shown, the outer surfaces of the first sleeve 320, the second sleeve 330, and the third sleeve 340 are cylindrical. The cylindrical surfaces facilitate demolding during the production of the bushing 300. In other embodiments, the surfaces may also be prisms, cylindrical surfaces with protrusions, etc.

[0048] In some embodiments, the bushing 300 is provided with a chamfered portion (not shown in the figure) that transitions to the first surface 321. It is understood that the chamfered portion can effectively remove burrs at the boundary of the first surface 321, ensuring the fit between the first surface 321 and the rotor core 100.

[0049] According to some embodiments of this utility model, combined with Figure 3 and Figure 4 As shown, the cross-section of the polygonal hole 331 is a regular polygon. The regular polygon ensures that the contact surface between the polygonal hole 331 and the rotating shaft 200 is evenly distributed around the axis of the rotating shaft 200, avoiding one-sided jamming of the bushing 300 and facilitating assembly.

[0050] In this embodiment, the polygonal hole 331 is a regular hexagon, but it can also be a regular pentagon, a regular quadrilateral, etc.

[0051] 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 insulation coating structure, characterized in that, include: The rotor core (100) is provided with a shaft mounting hole (110). A rotating shaft (200) is installed in the rotating shaft mounting hole (110). The bushing (300) has a connecting hole (310) and a first surface (321) that fits against the rotor core (100). The connecting hole (310) is sleeved on the rotating shaft (200). The bushing (300) and the rotating shaft (200) surround a venting space. The venting space connects the rotating shaft mounting hole (110) with the outside.

2. The rotor insulation coating structure according to claim 1, characterized in that, At least a portion of the connecting hole (310) is a polygonal hole (331), the sidewall of which is tangent to the rotating shaft (200), and the polygonal hole (331) constitutes part of the venting space.

3. The rotor insulation coating structure according to claim 2, characterized in that, The bushing (300) includes a first sleeve (320) and a second sleeve (330). The first end of the first sleeve (320) is provided with the first surface (321), and the second end is connected to the second sleeve (330). The second sleeve (330) is provided with the polygonal hole (331). A first clearance space (322) is formed between the first sleeve (320), the rotating shaft (200) and the rotor core (100) surrounding the rotating shaft mounting hole (110), and the first clearance space (322) connects the rotating shaft mounting hole (110) and the polygonal hole (331).

4. The rotor insulation coating structure according to claim 3, characterized in that, The inner diameter of the first sleeve (320) is larger than the diameter of the shaft mounting hole (110).

5. The rotor insulation coating structure according to claim 3, characterized in that, The bushing (300) further includes a third sleeve (340), the third sleeve (340) and the first sleeve (320) are respectively connected to the two ends of the second sleeve (330), and a shoulder is formed between the third sleeve (340) and the second sleeve (330) extending in a direction away from the axis of the rotating shaft (200).

6. The rotor insulation coating structure according to claim 5, characterized in that, A second clearance space (341) is provided between the third sleeve (340) and the rotating shaft (200) surrounding the rotating shaft (200).

7. The rotor insulation coating structure according to claim 5, characterized in that, The outer surfaces of the first sleeve (320), the second sleeve (330) and the third sleeve (340) are cylindrical.

8. The rotor insulation coating structure according to any one of claims 1 to 7, characterized in that, The bushing (300) has a chamfered portion that transitions to the first surface (321).

9. The rotor insulation coating structure according to any one of claims 2 to 7, characterized in that, The cross-section of the polygonal hole (331) is a regular polygon.

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