Mechanical seal permanent magnet motor

Abstract

The utility model discloses a mechanical seal permanent magnet motor, which relates to the technical field of motor sealing, and comprises a motor base, a front end cover and a rear end cover, a rotating shaft is rotatably connected to the centers of the front end cover and the rear end cover, a rotor assembly is sleeved on the rotating shaft, and the rotor assembly is provided with a stator assembly in a matched manner. The center of the front end cover is provided with an annular protrusion and is provided with a sealing disc in a clamped mode, the center of the sealing disc is provided with a threaded hole connected to the rotating shaft in a threaded mode, an orifice of the threaded hole is provided with a conical face, and the peripheral side of the rotating shaft is provided with a step chamfer structure and is in sealing fit with the conical face. Threaded holes which are evenly distributed in the circumferential direction are formed in the sealing disc and matched with expansion fastening screws, and notches are formed in the hole walls of the threaded holes. The technical problem to be solved by the utility model is to provide the mechanical seal permanent magnet motor which is convenient to disassemble and assemble, flexible to replace, free from damaging the original internal structure of the motor, good in sealing effect and good in structural stability by adopting conical surface sealing.

Description

Technical Field

[0001] This utility model relates to the field of motor sealing technology, specifically to a mechanically sealed permanent magnet motor. Background Technology

[0002] The motor sealing structure is crucial for protecting the internal components of the motor from external environmental influences, especially in harsh working environments such as those containing dust, moisture, or other contaminants. An effective sealing design not only extends the motor's lifespan but also improves its efficiency and reliability. Traditional motor sealing structures do not adequately consider the ease of installation and disassembly, leading to inconvenience during maintenance and repair. Utility Model Content

[0003] Technical problem to be solved by the utility model

[0004] The technical problem to be solved by this utility model is to provide a mechanically sealed permanent magnet motor that is easy to disassemble and assemble, flexible to replace, and will not damage the original internal structure of the motor. It adopts a conical seal, which has a good sealing effect and a stable structure.

[0005] Technical solution

[0006] To solve the above problems, the technical solution provided by this utility model is as follows:

[0007] A mechanically sealed permanent magnet motor includes a base, a front cover, and a rear cover. A rotating shaft is rotatably connected to the center of the front and rear covers. A rotor assembly is sleeved on the rotating shaft, and a stator assembly is fitted onto the rotor assembly. A sealing disc is fitted onto the center of the front cover with an annular protrusion. A threaded hole is threaded onto the rotating shaft at the center of the sealing disc. The opening of the threaded hole has a tapered surface. The circumference of the rotating shaft has a stepped chamfered structure that seals with the tapered surface. The sealing disc has circumferentially evenly distributed threaded holes fitted with expansion bolts. The walls of the threaded holes all have grooves.

[0008] The base, front cover, and rear cover provide overall structural support. The shaft, one of the core components of the motor, passes through the front and rear covers and mounts the rotor assembly. The stator assembly works in conjunction with the rotor assembly to convert electrical energy into mechanical energy. A ring-shaped protrusion (ring bump) is located in the center of the front cover to engage the sealing disc. The sealing disc has a through hole in its center, allowing the shaft to pass through, and the opening of the through hole has a tapered surface design to enhance the sealing effect. The tapered surface and the stepped chamfered structure improve the sealing performance, including dust and water resistance. The sealing disc has multiple threaded holes, evenly distributed circumferentially, equipped with expansion bolts to effectively secure the sealing disc. Furthermore, the walls of the threaded holes have grooves; when the expansion bolts are tightened, the threaded holes are expanded, achieving a tightening effect and locking the sealing disc.

[0009] Optionally, the front end cover has a central groove and is fitted with a front deep groove ball bearing, and the rear end cover has a central groove and is fitted with a rear deep groove ball bearing.

[0010] Deep groove ball bearings provide essential support for the shaft, ensuring stability during high-speed rotation and reducing vibration and noise. By using deep groove ball bearings, friction during shaft rotation is effectively reduced, which helps improve motor efficiency and reduce energy loss. This design also simplifies bearing installation and subsequent maintenance. When bearing replacement or repair is required, it can be done directly from the front or rear cover without disassembling the entire motor structure.

[0011] Optionally, the sealing disc has two layers of protrusions on its end face circumference, with an annular groove in the middle of the two layers of protrusions, and the front end cover has two layers of protrusions, one of which mates with the annular groove.

[0012] By incorporating two layers of protrusions on the circumferential side of the sealing disc, forming an annular groove between them, an additional sealing barrier is provided. When one of the protrusions tightly engages with the corresponding structure on the front cover, it effectively prevents dust, moisture, and other contaminants from entering the motor, further improving sealing performance. The double-layered protrusions on the sealing disc and the matching structure on the front cover not only enhance the sealing effect but also provide better mechanical stability. This helps ensure that the sealing disc remains in a fixed position during operation, reducing the risk of displacement due to vibration or temperature changes. Although this design increases the complexity of the sealing disc, it does not significantly increase installation difficulty. On the contrary, it provides clear alignment guidance for installers, making it easier to install the sealing disc correctly. Furthermore, it facilitates disassembly and reassembly when maintenance or replacement is required.

[0013] Optionally, a lip seal is provided between the inner side of the front cover and the rotating shaft.

[0014] Lip seals, through their elastic material and special structural design, can tightly conform to the surface of the shaft, forming an effective dynamic seal to prevent external dust, moisture, and other contaminants from entering the motor. Although the lip seal fits tightly against the shaft, its soft material and specific lip shape design minimize frictional resistance to shaft rotation while ensuring a good seal, thereby reducing energy loss and extending service life.

[0015] Optionally, the annular groove structure, the conical surface, and the lip seal are arranged adjacent to each other.

[0016] The initial physical barrier provided by the annular groove structure, combined with the tight fit achieved by the conical surface and the sealing capability of the lip seal under dynamic conditions, forms a multi-layered protection system. This design not only improves the motor's resistance to the external environment but also significantly reduces the risk of malfunctions due to contaminant intrusion, thus ensuring the long-term stable operation of the motor.

[0017] Optionally, the slot opens toward the direction of the rotating shaft.

[0018] When the expansion bolts are tightened, the threaded hole expands outward, and the deformation on both sides of the groove is the greatest. The groove facing the shaft can maximize the pressure generated by the deformation on the shaft surface, thereby increasing the locking force of the sealing disc on the shaft and improving the structural stability of the sealing disc.

[0019] Optionally, the stepped chamfer structure on the periphery of the rotating shaft is provided with a tool relief groove.

[0020] Relief grooves are primarily used during turning processes to facilitate tool retraction and prevent damage to the machined surface caused by direct tool removal after machining. This helps maintain the machining quality of the shaft, ensuring its surface finish and dimensional accuracy. Stress concentration can easily occur at abrupt geometric changes such as steps or chamfers, leading to material fatigue or crack propagation. By incorporating relief grooves, transitions between sections of different diameters can be smoothed, effectively dispersing stress and improving the shaft's fatigue resistance and service life. While relief grooves near stepped or chamfered structures do not directly affect sealing performance, they indirectly support the effective operation of seals (such as the fit between a tapered surface and a sealing disc, lip seals, etc.) by ensuring the shaft's precise manufacturing. A burr-free, defect-free shaft surface is more conducive to forming a tight and durable seal. Relief grooves also provide additional space during the assembly process of the sealing disc, accommodating minor deviations or misalignments, making the assembly process smoother.

[0021] Alternatively, the sealing disc may be a one-piece molded structure.

[0022] The unibody design reduces the number of components, simplifying the installation process. There's no need to worry about alignment issues between multiple parts or perform complex assembly steps, improving installation efficiency and reducing the error rate. The entire sealing disc is made from a single piece of material, with no welds or adhesive joints, eliminating the risk of leakage due to aging, loosening, or damage at connections. This ensures a long-term, stable seal.

[0023] Beneficial effects

[0024] Compared with the prior art, the technical solution provided by this utility model has the following advantages:

[0025] The technical solution provided by this utility model not only improves the sealing performance of the motor, but also makes maintenance simpler, allowing the replacement of sealing components to be completed without large-scale disassembly of the motor's interior. Attached Figure Description

[0026] Figure 1 A schematic diagram of the structure of a mechanically sealed permanent magnet motor proposed in an embodiment of this utility model;

[0027] Figure 2 A schematic diagram of the Q-partial structure of a mechanically sealed permanent magnet motor proposed for an embodiment of this utility model;

[0028] Figure 3 A schematic diagram of the P-end face structure of a mechanically sealed permanent magnet motor proposed for an embodiment of this utility model;

[0029] 1. Base; 2. Front cover; 201. Ring protrusion; 3. Rear cover; 4. Rear deep groove ball bearing; 5. Front deep groove ball bearing; 6. Shaft; 7. Rotor assembly; 8. Stator assembly; 9. Sealing disc; 901. Ring groove; 10. Expansion bolt; 11. Lip seal; 12. Groove; 13. Conical sealing surface; 14. Relief groove. Detailed Implementation

[0030] To further understand the content of this utility model, a detailed description of this utility model will be provided in conjunction with the accompanying drawings and embodiments.

[0031] Example

[0032] Combined with appendix Figure 1-3A mechanically sealed permanent magnet motor includes a base 1, a front cover 2, and a rear cover 3. A rotating shaft 6 is rotatably connected to the center of the front cover 2 and the rear cover 3. The front cover 2 has a central circular groove in which a front deep groove ball bearing 5 is embedded, and the rear cover 3 has a central circular groove in which a rear deep groove ball bearing 4 is embedded. The rotating shaft 6 is clamped to the inner rings of the front and rear deep groove ball bearings 5 ​​and 4. A partition is provided in the middle of the front cover 2, with a sealing disc 9 on the outer side and the front deep groove ball bearing 5 extending inward on the inner side. Multiple stepped structures are provided at both ends of the rotating shaft 6 for axial positioning. The front cover 2 has a through hole in the center for the rotating shaft 6 to pass through, while the rear cover 3 is not through and has a circular groove.

[0033] A rotor assembly 7 is fitted onto the rotating shaft 6, and a stator assembly 8 is fitted onto the rotor assembly 7. The stator assembly 8 is fixed to the inner wall of the base 1. A ring protrusion 201 is provided in the center of the front end cover 2, and a sealing disc 9 is engaged therewith. The sealing disc 9 is a disc with a central protrusion. The central protrusion is used to open a threaded hole and has a larger contact area with the rotating shaft 6, so as to be clamped onto the rotating shaft 6.

[0034] The sealing disc 9 has a threaded hole in its center that connects to the rotating shaft 6. The opening of the threaded hole has a tapered surface. The rotating shaft 6 has an external thread that mates with the internal thread of the sealing disc 9. The circumference of the rotating shaft 6 has a stepped chamfered structure that seals with the tapered surface.

[0035] Combined with appendix Figure 3 The sealing disc 9 has circumferentially evenly distributed threaded holes and is fitted with expansion bolts 10. The walls of each threaded hole have grooves 12. The grooves 12 open towards the rotating shaft 6. In this embodiment, there are four threaded holes, evenly distributed circumferentially.

[0036] Combined with appendix Figure 2 The sealing disc 9 has two layers of protrusions on its end face circumference, with an annular groove 901 between the two layers of protrusions. The front cover 2 has two layers of protrusions, one of which mates with the annular groove 901. The edges of the protrusions are chamfered for easy assembly and snap-fit.

[0037] A lip seal 11 is provided between the inner side of the front cover 2 and the rotating shaft 6. The annular groove 901 structure, the conical surface and the lip seal 11 are arranged adjacent to each other.

[0038] The stepped chamfer structure on the periphery of the rotating shaft 6 is provided with a tool relief groove 14, which is located at the top of the conical surface.

[0039] The sealing disc 9 is a one-piece molded structure.

[0040] In this embodiment, the front cover 2 and the rear cover 3 can have the same structure, so that the rotating shaft 6 can extend out of the rear cover 3. At this time, the rear cover 3 is also provided with a through hole for the rotating shaft to pass through, and it is not limited to only the front cover 2 being able to extend out of the rotating shaft 6 for transmission.

[0041] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A mechanically sealed permanent magnet motor, characterized in that, The device includes a base, a front cover, and a rear cover. A rotating shaft is rotatably connected to the center of the front and rear covers. A rotor assembly is fitted onto the rotating shaft, and a stator assembly is fitted onto the rotor assembly. A sealing disc is fitted onto the center of the front cover with an annular protrusion. A threaded hole is threaded onto the rotating shaft at the center of the sealing disc. The opening of the threaded hole has a tapered surface. The rotating shaft has a stepped chamfered structure on its periphery, which seals against the tapered surface. The sealing disc has circumferentially evenly distributed threaded holes fitted with expansion bolts. The walls of the threaded holes all have grooves.

2. The mechanically sealed permanent magnet motor according to claim 1, characterized in that, The front end cover has a central groove and is fitted with a front deep groove ball bearing, and the rear end cover has a central groove and is fitted with a rear deep groove ball bearing.

3. A mechanically sealed permanent magnet motor according to claim 1, characterized in that, The sealing disc has two layers of protrusions on its end face and an annular groove between the two layers of protrusions. The front end cover has two layers of protrusions, one of which mates with the annular groove.

4. A mechanically sealed permanent magnet motor according to claim 3, characterized in that, A lip-shaped sealing ring is provided between the inner side of the front cover and the rotating shaft.

5. A mechanically sealed permanent magnet motor according to claim 4, characterized in that, The annular groove structure, the conical surface, and the lip seal are arranged adjacent to each other.

6. A mechanically sealed permanent magnet motor according to claim 1, characterized in that, The slot opens toward the direction of the rotating shaft.

7. A mechanically sealed permanent magnet motor according to claim 1, characterized in that, The stepped chamfer structure on the periphery of the rotating shaft is provided with a tool relief groove.

8. A mechanically sealed permanent magnet motor according to claim 1, characterized in that, The sealing disc is a one-piece molded structure.

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