Outer rotor motor for harsh operating conditions
Patent Information
- Application Number
- CN202522266862.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-27
- Publication Date
- 2026-09-25
- Estimated Expiration
- 2035-10-27
AI Technical Summary
但是即使在这种结构下，电机的轴与电机自身壳体之间的转动处，仍然容易进入砂石，砂石可从外壳的预设孔处进入，并直接沿着轴进入到电机内
本实用新型提供了用于恶劣工况的外转子电机，涉及电机领域，包括外壳、后盖、外转子无刷电机和密封件；所述外壳具有容纳腔；所述容纳腔具有第一开口；所述后盖可拆卸固定在所述第一开口上；所述后盖固定在所述第一开口上时可密封所述第一开口；所述外转子无刷电机包括电机本体和电机轴；所述电机本体设置在所述容纳腔内；所述电机轴可转动固定在所述电机本体上；所述后盖上开设有用于伸出电机轴的伸出通道；所述后盖盖合在所述第一开口上时，所述电机轴从所述伸出通道伸出到所述容纳腔外部；所述电机轴上设置有转轴套；所述转轴套处于所述容纳腔内；所述后盖与所述转轴套之间设置有所述密封件；所述密封件包括可相互转动的第一端部和第二端部；所述第一端部密封固定于所述后盖内侧面；所述第二端部密封固定于所述转轴套。本实用新型提供的用于恶劣工况的外转子电机，解决了现有技术中，恶劣工况下，砂石容易进入到电机内影响电机运行的问题，可以减少砂石进入电机内影响电机运行。
Smart Images
Figure CN224804749U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of motors, and more particularly to an external rotor motor for use in harsh working conditions. Background Technology
[0002] In industrial drives, underwater operations, and mining, a common approach to motor protection and integrated installation is to assemble the motor body into a separate external housing. The motor is housed within this independent housing, with its power output shaft extending through a pre-drilled hole in the housing. The housing provides physical protection and a mounting reference for the internal motor. However, even with this structure, sand and gravel can easily enter at the point of rotation between the motor shaft and the housing. These particles can enter through the pre-drilled hole in the housing and travel directly along the shaft into the motor.
[0003] As a special type of motor, the core feature of an external rotor motor is that the coil windings are integrated into a fixed stator on the inside, and the rotor rotates around the stator in a ring structure. A shaft sleeve can be installed at the shaft, so that sand and gravel cannot directly enter the motor along the shaft axis. However, to ensure the normal rotation of the shaft, after the shaft sleeve is installed, it cannot be directly sealed and fixed to the outer shell because the outer shell does not rotate. In this case, sand and gravel can still enter the motor through the gap between the shaft sleeve and the motor body by bypassing the gap between the shaft sleeve and the outer shell. Utility Model Content
[0004] To address the aforementioned technical problems, the external rotor motor for harsh working conditions provided by this utility model can reduce the impact of sand and gravel entering the motor and affecting its operation.
[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: This utility model provides an external rotor motor for harsh working conditions, comprising a housing, a rear cover, an external rotor brushless motor, and a seal. The housing has a receiving cavity with a first opening. The rear cover is detachably fixed to the first opening, sealing the opening when fixed. The external rotor brushless motor includes a motor body and a motor shaft. The motor body is disposed within the receiving cavity. The motor shaft is rotatably fixed to the motor body. The rear cover has an extension channel for the motor shaft to extend out. When the rear cover is closed over the first opening, the motor shaft extends from the extension channel to the outside of the receiving cavity. A rotating shaft sleeve is disposed on the motor shaft within the receiving cavity. The seal is disposed between the rear cover and the rotating shaft sleeve. The seal includes a first end and a second end that are rotatable relative to each other. The first end is sealed and fixed to the inner side of the rear cover, and the second end is sealed and fixed to the rotating shaft sleeve.
[0006] The external rotor motor for harsh working conditions provided by this utility model preferably includes a sealing element comprising a sealing ring, a ceramic ring, a silicon carbide ring, an elastomer, and a spring; the sealing ring, the ceramic ring, the silicon carbide ring, the elastomer, and the spring are all tubular structures and coaxially arranged; the sealing ring includes a first contact surface and a second contact surface; both the first and second contact surfaces are planar; the first and second contact surfaces are parallel to each other; the first contact surface of the sealing ring is fixed towards the inner side of the rear cover; the ceramic ring includes a third contact surface and a fourth contact surface; the third contact surface of the ceramic ring is fixed against the second contact surface; the silicon carbide ring includes a fifth contact surface... The elastic body comprises a fifth contact surface and a sixth contact surface; the fifth contact surface is abutted against the fourth contact surface; the outer wall of the tubular structure of the elastic body is provided with a cylindrical annular receiving groove; the axis of the cylindrical annular receiving groove is coaxial with the axis of the tubular structure of the elastic body; the spring is disposed in the receiving groove; the two ends of the spring are respectively pressed against the two bottom surfaces of the cylindrical annular receiving groove; the elastic body can extend and retract along the tubular axis of the tubular structure; the elastic body includes a seventh contact surface and an eighth contact surface; the spring can change the distance between the seventh contact surface and the eighth contact surface; the seventh contact surface is fixed against the sixth contact surface; the eighth contact surface is sealed against the rotating shaft sleeve.
[0007] The external rotor motor for harsh working conditions provided by this utility model preferably has a cylindrical groove on the second contact surface of the sealing ring; the outer wall of the ceramic ring is cylindrical; the diameter of the cylindrical hole of the groove is equal to the diameter of the cylindrical hole of the outer wall of the ceramic ring; and the outer wall of the ceramic ring is fixed to the inner wall of the cylindrical hole of the groove.
[0008] The external rotor motor for harsh working conditions provided by this utility model preferably has a second annular cylindrical groove on the sixth contact surface of the silicon carbide ring; the inner side of the elastomer is disposed against the annular cylindrical outer wall of the second groove.
[0009] The external rotor motor for harsh working conditions provided by this utility model preferably has the following characteristics: the first contact surface and the inner side of the rear cover are pressed together with rubber; the second contact surface and the third contact surface are pressed together with rubber; the fourth contact surface and the fifth contact surface are frictionally bonded and sealed; and the sixth contact surface and the seventh contact surface are pressed together with rubber.
[0010] The above technical solution has the following advantages or beneficial effects: This utility model provides an external rotor motor for harsh working conditions, relating to the field of motors, including a housing, a rear cover, an external rotor brushless motor, and a seal; the housing has a receiving cavity; the receiving cavity has a first opening; the rear cover is detachably fixed to the first opening; when the rear cover is fixed to the first opening, it can seal the first opening; the external rotor brushless motor includes a motor body and a motor shaft; the motor body is disposed within the receiving cavity; the motor shaft is rotatably fixed to the motor body; the rear cover has an extension channel for the motor shaft to extend out; when the rear cover is closed on the first opening, the motor shaft extends from the extension channel to the outside of the receiving cavity; a rotating shaft sleeve is disposed on the motor shaft; the rotating shaft sleeve is located within the receiving cavity; the seal is disposed between the rear cover and the rotating shaft sleeve; the seal includes a first end and a second end that are rotatable relative to each other; the first end is sealed and fixed to the inner side of the rear cover; the second end is sealed and fixed to the rotating shaft sleeve. The external rotor motor for harsh working conditions provided by this utility model solves the problem in the prior art where sand and gravel can easily enter the motor and affect its operation under harsh working conditions, thereby reducing the impact of sand and gravel entering the motor and affecting its operation. Attached Figure Description
[0011] The present invention, its features, shape, and advantages will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings. Like reference numerals denote like parts throughout the drawings. The drawings are not intentionally drawn to scale; the focus is on illustrating the gist of the invention.
[0012] Figure 1 This is a schematic cross-sectional view of the external rotor motor for harsh working conditions provided in Embodiment 1 of this utility model.
[0013] Figure 2 This is a cross-sectional structural diagram of the sealing component for an external rotor motor used in harsh working conditions, provided in Embodiment 1 of this utility model.
[0014] Figure 3 This is a schematic diagram showing the positional relationship of the sealing ring, ceramic ring, silicon carbide ring, elastomer, and spring of the external rotor motor for harsh working conditions provided in Embodiment 1 of this utility model. Detailed Implementation
[0015] Example 1: The external rotor motor for harsh working conditions provided in Embodiment 1 of this utility model, such as Figures 1 to 3As shown, the device includes a housing 1, a rear cover 2, an external rotor brushless motor, and a seal 4. The housing 1 has a receiving cavity with a first opening. The rear cover 2 is detachably fixed to the first opening and can seal the first opening when fixed. The external rotor brushless motor includes a motor body 31 and a motor shaft 32. The motor body 31 is disposed within the receiving cavity. The motor shaft 32 is rotatably fixed to the motor body 31. The rear cover 2 has an extension channel for the motor shaft 32 to extend out. When the rear cover 2 is closed over the first opening, the motor shaft 32 extends out of the receiving cavity through the extension channel. A rotating shaft sleeve 33 is disposed on the motor shaft 32 and is located within the receiving cavity. A seal 4 is disposed between the rear cover 2 and the rotating shaft sleeve 33. The seal 4 includes a first end and a second end that are rotatable relative to each other. The first end is sealed and fixed to the inner side of the rear cover 2, and the second end is sealed and fixed to the rotating shaft sleeve 33.
[0016] The external rotor motor for harsh working conditions provided in Embodiment 1 of this utility model uses an external rotor brushless motor and is equipped with a rotating shaft sleeve 33 that rotates synchronously with the motor shaft 32. When sand and gravel enter along the axial direction of the motor shaft 32, they are blocked by the rotating shaft sleeve 33. When the sand and gravel move perpendicular to the axial direction of the motor shaft 32, they are blocked by the seal 4. By setting up the outer shell 1 and the seal 4, the outer shell 1 restricts sand and gravel from directly entering and contacting the motor body 31. Using the two mutually rotatable ends 401 and 2 of the seal 4, the second end rotates with the motor shaft 32, while the first end remains stationary with the outer shell 1 and the rear cover 2. The seal 4 also restricts sand and gravel from bypassing the rotating shaft sleeve 33 and entering the motor body 31, thereby protecting the motor body 31. Preferably, in this embodiment, heat-conducting oil is provided between the outer shell 1 and the motor body 31. When the seal 4 achieves sealing, the presence of heat-conducting oil on the outside of the motor body 31 can reduce the impact of rapid temperature changes on the motor body 31 in environments with large temperature differences.
[0017] The external rotor motor for harsh working conditions provided in Embodiment 1 of this utility model solves the problem in the prior art where sand and gravel easily enter the motor under harsh working conditions, affecting the motor's operation. It can reduce the impact of sand and gravel entering the motor on its operation.
[0018] To specifically prevent sand and gravel from bypassing the rotating shaft sleeve 33 through the seal 4, in this embodiment, the seal 4 includes a sealing ring 41, a ceramic ring 42, a silicon carbide ring 43, an elastomer 44, and a spring 45; the sealing ring 41, ceramic ring 42, silicon carbide ring 43, elastomer 44, and spring 45 are all tubular structures and coaxially arranged; the sealing ring 41 includes a first contact surface 411 and a second contact surface 412; both the first contact surface 411 and the second contact surface 412 are planar; the first contact surface 411 and the second contact surface 412 are parallel to each other; the first contact surface 411 of the sealing ring 41 is fixed towards the inner side of the rear cover 2; the ceramic ring 42 includes a third contact surface 421 and a fourth contact surface 422; the third contact surface 421 of the ceramic ring 42 is fixed against the second contact surface 412; the silicon carbide ring 43... The system includes a fifth contact surface 431 and a sixth contact surface 432; the fifth contact surface 431 is abutted against the fourth contact surface 422; the outer wall of the tubular structure of the elastic body 44 is provided with a cylindrical annular receiving groove 441; the axis of the cylindrical annular groove 441 is coaxial with the axis of the tubular structure of the elastic body 44; a spring 45 is disposed in the receiving groove 441; the two ends of the spring 45 are respectively pressed against the two bottom surfaces of the cylindrical annular groove 441; the elastic body 44 can extend and retract along the direction of the tubular axis; the elastic body 44 includes a seventh contact surface 442 and an eighth contact surface 443; when the spring 45 extends and retracts, it can change the distance between the seventh contact surface 442 and the eighth contact surface 443; the seventh contact surface 442 is fixed against the sixth contact surface 432; the eighth contact surface 443 is sealed against the rotating shaft sleeve 33 and fixed. The sealing ring 41 and ceramic ring 42 are fixed to the rear cover 2 and remain stationary with the outer casing 1; the silicon carbide ring 43 and elastomer 44 are fixed to the rotating shaft sleeve 33 and rotate synchronously with the motor shaft 32; the sealing ring 41, ceramic ring 42, silicon carbide ring 43, and elastomer 44 are all tubular. When sand enters along the axial direction of the motor shaft 32, the sand is always inside the tubes of the sealing ring 41, ceramic ring 42, silicon carbide ring 43, and elastomer 44, and the ceramic ring 42 and silicon carbide ring 43 are tightly pressed against each other. They will rotate relative to each other; since the eighth contact surface 443 of the elastic body 44 is sealed and fixed on the rotating sleeve 33, when the spring 45 naturally extends, the seventh contact surface 442 will apply pressure to the sixth contact surface 432 of the silicon carbide ring 43, so that the silicon carbide ring 43 presses against the ceramic ring 42, thereby achieving a seal; since both the silicon carbide ring 43 and the ceramic ring 42 have ultra-high hardness, and the fifth contact surface 431 of the silicon carbide ring 43 reacts with oxygen to generate an amorphous SiO2 oxide film, the coefficient of friction is low.
[0019] In this embodiment, the second contact surface 412 of the sealing ring 41 is provided with a cylindrical groove 4121; the outer wall of the ceramic ring 42 is cylindrical; the diameter of the cylindrical hole in the groove is equal to the diameter of the cylindrical hole on the outer wall of the ceramic ring 42; the outer wall of the ceramic ring 42 is fixed to the inner wall of the cylindrical hole in the groove 4121. The sealing ring 41 is directly fixed to the rear cover 2. To avoid relative displacement between the sealing ring 41 and the ceramic ring 42, which would affect their coaxiality and cause the ceramic ring 42 to contact the motor shaft 32, this embodiment provides a cylindrical groove 4121 on the second contact surface 412. The groove 4121 restricts the movement of the ceramic ring 42 along a direction perpendicular to the rotation axis of the ceramic ring 42, ensuring that the ceramic ring 42 and the motor shaft 32 are coaxial.
[0020] In this embodiment, the sixth contact surface 432 of the silicon carbide ring 43 is provided with a second annular cylindrical groove 4321; the inner side of the elastic body 44 is disposed against the annular cylindrical outer wall of the second groove 4321. Since the eighth contact surface 443 of the elastic body 44 is directly fixed to the rotating sleeve 33, the axis of the elastic body 44 is fixed. In this embodiment, by providing the second annular cylindrical groove 4321 on the silicon carbide ring 43 to cooperate with the elastic body 44, the coaxial positioning of the silicon carbide ring 43 is achieved by utilizing the fixed tubular inner wall position of the elastic body 44.
[0021] As a preferred embodiment, in this embodiment, the first contact surface 411 and the inner side of the rear cover 2 are pressed together with rubber; the second contact surface 412 and the third contact surface 421 are pressed together with rubber; the fourth contact surface 422 and the fifth contact surface 431 are frictionally bonded and sealed; and the sixth contact surface 432 and the seventh contact surface 442 are pressed together with rubber.
[0022] In summary, this utility model provides an external rotor motor for harsh working conditions, relating to the field of motors, including a housing, a rear cover, an external rotor brushless motor, and a seal; the housing has a receiving cavity; the receiving cavity has a first opening; the rear cover is detachably fixed to the first opening; when the rear cover is fixed to the first opening, it can seal the first opening; the external rotor brushless motor includes a motor body and a motor shaft; the motor body is disposed within the receiving cavity; the motor shaft is rotatably fixed to the motor body; the rear cover has an extension channel for extending the motor shaft; when the rear cover is closed on the first opening, the motor shaft extends from the extension channel to the outside of the receiving cavity; a rotating shaft sleeve is disposed on the motor shaft; the rotating shaft sleeve is located within the receiving cavity; the seal is disposed between the rear cover and the rotating shaft sleeve; the seal includes a first end and a second end that are rotatable relative to each other; the first end is sealed and fixed to the inner side of the rear cover; the second end is sealed and fixed to the rotating shaft sleeve. The external rotor motor for harsh working conditions provided by this utility model solves the problem in the prior art where sand and gravel can easily enter the motor and affect its operation under harsh working conditions, thereby reducing the impact of sand and gravel entering the motor and affecting its operation.
[0023] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the contents of the present utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present utility model.
Claims
1. An external rotor motor for harsh working conditions, characterized in that, The device includes a housing, a rear cover, an external rotor brushless motor, and seals; the housing has a receiving cavity; the receiving cavity has a first opening; the rear cover is detachably fixed to the first opening. When the back cover is fixed to the first opening, it can seal the first opening; The external rotor brushless motor includes a motor body and a motor shaft; The motor body is disposed within the receiving cavity; the motor shaft is rotatably fixed to the motor body; The rear cover has an extension channel for the motor shaft to extend out; when the rear cover is closed on the first opening, the motor shaft extends out of the receiving cavity from the extension channel. A rotating shaft sleeve is provided on the motor shaft; the rotating shaft sleeve is located inside the receiving cavity; the sealing element is provided between the rear cover and the rotating shaft sleeve; The seal includes a first end and a second end that are rotatable relative to each other; The first end is sealed and fixed to the inner side of the rear cover; the second end is sealed and fixed to the rotating shaft sleeve.
2. The external rotor motor for harsh operating conditions as described in claim 1, characterized in that, The sealing element includes a sealing ring, a ceramic ring, a silicon carbide ring, an elastomer, and a spring; The sealing ring, the ceramic ring, the silicon carbide ring, the elastomer, and the spring are all tubular structures and are coaxially arranged. The sealing ring includes a first contact surface and a second contact surface; both the first contact surface and the second contact surface are planar; the first contact surface and the second contact surface are parallel to each other; the first contact surface of the sealing ring is fixed facing the inner side of the rear cover. The ceramic ring includes a third contact surface and a fourth contact surface; the third contact surface of the ceramic ring is fixed against the second contact surface. The silicon carbide ring includes a fifth contact surface and a sixth contact surface; the fifth contact surface is disposed against the fourth contact surface. The tubular structure of the elastomer has a cylindrical annular groove on its outer wall; the axis of the cylindrical annular groove is coaxial with the axis of the tubular structure of the elastomer; the spring is disposed in the groove; the two ends of the spring are respectively pressed against the two bottom surfaces of the cylindrical annular groove; the elastomer can extend and retract along the axis of the tubular structure. The elastic body includes a seventh contact surface and an eighth contact surface; the distance between the seventh contact surface and the eighth contact surface can be changed when the spring extends or retracts; The seventh contact surface is fixed against the sixth contact surface; the eighth contact surface is sealed against the rotating shaft sleeve.
3. The external rotor motor for harsh working conditions as described in claim 2, characterized in that, The second contact surface of the sealing ring is provided with a cylindrical groove; The outer wall of the ceramic ring is cylindrical; The diameter of the cylindrical hole in the groove is equal to the diameter of the outer cylindrical wall of the ceramic ring; the outer wall of the ceramic ring is fixed tightly against the inner wall of the cylindrical hole in the groove.
4. The external rotor motor for harsh operating conditions as described in claim 3, characterized in that, The sixth contact surface of the silicon carbide ring is provided with a second annular cylindrical groove; The inner side of the elastomer is disposed against the annular cylindrical outer wall of the second groove.
5. The external rotor motor for harsh operating conditions as described in claim 2, characterized in that, The first contact surface and the inner side of the rear cover are pressed together by rubber. The second contact surface and the third contact surface are pressed together by rubber. The fourth contact surface and the fifth contact surface are frictionally bonded and sealed. The sixth contact surface and the seventh contact surface are pressed together by rubber.