A labyrinth seal structure for enhancing protection of an outer rotor motor

Abstract

The application relates to a lashing structure for enhancing the protection of an outer rotor motor, and relates to the field of motor protection, which comprises a rotor assembly and a stator assembly, the rotor assembly comprises a magnetic steel pressing sleeve, the outer surface of the magnetic steel pressing sleeve is provided with a radial rib plate extending in the radial direction and a first axial rib plate extending in the axial direction; the stator assembly comprises an end cover, the bottom surface of the end cover is provided with a second axial rib plate, the inner side of the second axial rib plate is provided with an annular rib plate; and the first axial rib plate is located between the second axial rib plate and the annular rib plate. The application can construct a special structure between the magnetic steel pressing sleeve of the rotor assembly and the end cover of the stator assembly, and the layout of the radial rib plate, the first axial rib plate, the second axial rib plate and the annular rib plate is used, so that the first axial rib plate is located between the second axial rib plate and the annular rib plate, the outside gas and particles can be hindered from entering the motor, and the protection capability of the outer rotor motor is effectively enhanced.

Description

Technical Field

[0001] This application relates to the field of motor protection, and in particular to a toothed sealing structure for enhancing the protection of an external rotor motor. Background Technology

[0002] Large-sized, high-power external rotor EC fans are widely used in industrial production. These fans are commonly found in refrigeration and purification units in production workshops, playing a crucial role in ensuring the stable operation of industrial equipment and regulating ambient temperature and air quality. However, they are often exposed to complex and harsh environments such as high humidity, high dust levels, and strong acid, alkali, and salt spray, which significantly impacts the normal operation of the external rotor motor. The unavoidable gap between the stator and rotor of an external rotor motor prevents complete isolation between the internal and external environments, allowing external gases and particles to easily enter the motor, affecting its performance and lifespan. Therefore, effectively improving the protection capabilities of external rotor motors has become a critical issue that urgently needs to be addressed in this field. Utility Model Content

[0003] To address the problems of external rotor motors in the prior art, this application provides a toothed sealing structure to enhance the protection of external rotor motors.

[0004] This application provides a toothed sealing structure for enhancing the protection of an external rotor motor, employing the following technical solution: A grate sealing structure for enhancing the protection of an external rotor motor includes a rotor assembly and a stator assembly. The rotor assembly includes a magnet sleeve, the outer surface of which is provided with a radially extending radial rib and a first axially extending axial rib. The stator assembly includes an end cover, the bottom surface of which is provided with a second axial rib, and the inner side of the second axial rib is provided with an annular rib. The first axial rib is located between the second axial rib and the annular rib.

[0005] By adopting the above technical solution, a special structure can be constructed between the magnet sleeve of the rotor assembly and the end cover of the stator assembly. By utilizing the layout of radial ribs, first axial ribs, second axial ribs and annular ribs, the first axial rib is located between the second axial rib and the annular rib, which can prevent external gas and particles from entering the motor and effectively enhance the protection capability of the external rotor motor.

[0006] Preferably, the horizontal height of the radial rib is greater than the horizontal height of the first axial rib, and the radial rib forms a clearance fit with the inner wall of the end cap.

[0007] By adopting the above technical solution, the radial ribs and the inner wall of the end cover form a clearance fit, and the height difference setting can better block external gas and particles from entering the motor, thereby improving the protection capability of the external rotor motor.

[0008] Preferably, the end of the second axial rib extends to the root of the radial rib, the second axial rib and the radial rib form a clearance fit, and the annular rib and the first axial rib of the magnet sleeve form a clearance fit.

[0009] By adopting the above technical solution, the second axial rib and the radial rib, and the annular rib and the first axial rib respectively form a clearance fit, which further prevents external gas and particles from entering the motor and better improves the protection capability of the external rotor motor.

[0010] Preferably, the radial ribs are evenly distributed along the circumference of the magnet sleeve, and the first axial ribs are arranged at radial intervals along the magnet sleeve, with the first axial ribs forming a clearance fit with the bottom of the end cap.

[0011] By adopting the above technical solution, the radial ribs are evenly distributed along the circumference of the magnet sleeve, and the first axial ribs are spaced apart along the radial direction of the magnet sleeve, which enables the airflow to pass through the structure more evenly and stably. The gap fit between the first axial ribs and the bottom of the end cover can further prevent external gas and particles from entering the motor, thereby improving the protection capability of the external rotor motor.

[0012] Preferably, the length direction of the second axial rib is parallel to the rotation axis of the rotor assembly.

[0013] By adopting the above technical solution, the second axial rib can be better adapted to the rotor assembly during installation, ensuring that the second axial rib can stably form a reasonable clearance fit with other components such as radial ribs. Combined with the bidirectional grate sealing structure composed of the radial ribs on the outer surface of the rotor assembly's magnet sleeve, the first axial ribs, the second axial ribs on the bottom surface of the stator assembly end cover, and the annular ribs, the protection of the external rotor motor is enhanced, reducing the entry of external gases and particles into the motor, ensuring motor performance and extending service life.

[0014] Preferably, the magnet sleeve is fixed to the rotor cup of the rotor assembly by adhesive bonding, and the first axial rib and the radial rib are integrally formed on the outer surface of the magnet sleeve.

[0015] By adopting the above technical solution, the magnet sleeve is fixed to the rotor cup mouth of the rotor assembly by adhesive bonding, which can ensure that the magnet sleeve is firmly installed. The first axial rib and the radial rib are integrally formed on the outer surface of the magnet sleeve, which facilitates manufacturing, improves production efficiency, and makes the connection between the two tight and reliable.

[0016] Preferably, an air inlet impeller is also fixedly installed on the rotor cup of the rotor assembly. The air outlet of the air inlet impeller forms an air inlet channel with the gap between the radial rib and the end cover, the gap between the second axial rib and the radial rib, the gap between the first axial rib and the bottom of the end cover, and the gap between the annular rib and the first axial rib of the magnet sleeve.

[0017] By adopting the above technical solution, the air inlet impeller is fixed on the rotor cup of the rotor assembly, and its air outlet and the gap between each component form an air inlet channel. Radial ribs, first axial ribs, second axial ribs and annular ribs can be used to block particles and other substances entering the motor, thereby enhancing the protection capability of the external rotor motor, reducing the impact of the external environment on the motor performance and service life, and ensuring the motor's heat dissipation capability.

[0018] Preferably, the rotor cup of the rotor assembly is provided with an air outlet at the bottom.

[0019] By adopting the above technical solution, an air outlet is set at the bottom of the rotor cup of the rotor assembly, which allows the air entering the bidirectional grate sealing structure to be discharged. Combined with the air intake channel, airflow circulation is formed to ensure the heat dissipation capacity of the motor.

[0020] In summary, this application includes at least one of the following beneficial technical effects: 1. The radial ribs and first axial ribs of the rotor assembly magnet sleeve and the second axial ribs and annular ribs of the stator assembly end cover cooperate with each other to form a bidirectional grate sealing structure, which effectively improves the protection capability of the external rotor motor and reduces the entry of external particles into the motor. 2. The radial ribs, the second axial ribs, the annular ribs, and other components form a clearance fit, which further enhances the sealing effect and prevents external substances from entering the motor through the gaps; 3. The air intake impeller and various gaps form an air intake channel, optimizing the ventilation and heat dissipation path of the motor, reducing the interference of external factors on the internal environment of the motor, ensuring motor performance and extending service life. Attached Figure Description

[0021] Figure 1 This is an isometric schematic diagram of the main overall structure in the embodiments of this application; Figure 2 This is a cross-sectional view of the overall structure in the embodiments of this application.

[0022] Reference numerals: 1. Rotor assembly; 2. Stator assembly; 3. Magnet sleeve; 4. Radial rib; 5. First axial rib; 6. End cover; 7. Second axial rib; 8. Annular rib; 9. Inlet impeller; 10. Outlet. Detailed Implementation

[0023] The following is in conjunction with the appendix Figure 1 -Appendix Figure 2 This application will be described in further detail.

[0024] This application discloses a toothed sealing structure for enhancing the protection of an external rotor motor.

[0025] Reference Figure 1 and Figure 2 A toothed sealing structure for enhancing the protection of an external rotor motor includes a rotor assembly 1 and a stator assembly 2. The rotor assembly 1 and the stator assembly 2 cooperate with each other and form a multi-gap seal through a specific structural design, thereby effectively blocking external gases and particles from entering the motor and improving the motor's protection capability.

[0026] Reference Figure 1 and Figure 2 The rotor assembly 1 includes a magnet sleeve 3. The outer surface of the magnet sleeve 3 is provided with radially extending radial ribs 4 and axially extending first axial ribs 5. The radial ribs 4 are evenly distributed around the circumference of the magnet sleeve 3, ensuring a more balanced protective effect in all directions. The first axial ribs 5 are spaced radially along the magnet sleeve 3 and are integrally formed with it, ensuring the structural integrity and stability. The first axial ribs 5 form a clearance fit with the bottom of the end cover 6. This clearance ensures the normal rotation of the rotor assembly 1 while also preventing external substances from entering to a certain extent.

[0027] Reference Figure 1 and Figure 2 The magnet sleeve 3 is fixed to the rotor cup of the rotor assembly 1 by adhesive bonding. Adhesive bonding provides reliable connection force and prevents the magnet sleeve 3 from loosening during motor operation. At the same time, adhesive bonding also has a certain buffering effect, which can reduce the impact of vibration on the magnet sleeve 3 and the rotor cup.

[0028] Reference Figure 1 and Figure 2 The radial rib 4 has a higher horizontal height than the first axial rib 5, and the radial rib 4 forms a clearance fit with the inner wall of the end cover 6. This design allows the radial rib 4 to better prevent external substances from entering the motor from the radial direction. When external gas or particles attempt to enter the motor radially, they will be blocked by the radial rib 4 and can only enter slowly through the gap, thus greatly reducing the probability of entering the motor.

[0029] Reference Figure 1 and Figure 2The stator assembly 2 includes an end cover 6, which is generally made of cast iron or aluminum alloy, providing good rigidity and sealing. A second axial rib 7 is provided on the bottom surface of the end cover 6. The length direction of the second axial rib 7 is parallel to the rotation axis of the rotor assembly 1. This parallel design allows the second axial rib 7 to better cooperate with other components, forming an effective sealing structure. An annular rib 8 is provided on the inner side of the second axial rib 7. The annular rib 8 is a continuous ring structure surrounding the inner side of the stator assembly 2.

[0030] Reference Figure 1 and Figure 2 The end of the second axial rib 7 extends to the root of the radial rib 4, and the second axial rib 7 and the radial rib 4 form a clearance fit. The annular rib 8 and the first axial rib 5 of the magnet sleeve 3 form a clearance fit. This multi-clearance fit structure forms a tortuous channel. When external particles enter these gaps, they will continuously change the flow direction, increasing the flow resistance, thereby effectively preventing external substances from entering the motor.

[0031] Reference Figure 1 and Figure 2 An air inlet impeller 9 is also fixedly installed on the rotor cup of rotor assembly 1. The air outlet of the air inlet impeller 9 forms an air inlet channel with the gaps between the radial rib 4 and the end cover 6, the gap between the second axial rib 7 and the radial rib 4, the gap between the first axial rib 5 and the bottom of the end cover 6, and the gap between the annular rib 8 and the first axial rib 5 of the magnet sleeve 3. When the motor is running, the air inlet impeller 9 generates airflow. The airflow flows along the air inlet channel, which can carry away the heat generated inside the motor and play a role in heat dissipation. On the other hand, the airflow can also prevent external substances from entering the motor in reverse, further enhancing the motor's protection capability.

[0032] Reference Figure 1 and Figure 2 The rotor assembly 1 has an air outlet 10 at the bottom of the rotor cup. The air outlet 10 is used to exhaust hot air and air from inside the motor, ensuring air circulation inside the motor. The size and number of air outlets 10 need to be designed reasonably according to the power and heat dissipation requirements of the motor to ensure that hot air can be effectively exhausted.

[0033] The implementation principle of this application embodiment is as follows: Multiple clearance fits are formed by specific rib structures on the rotor assembly 1 and stator assembly 2, creating a tortuous channel that increases the resistance to external gas and particles entering the motor. Simultaneously, the airflow generated by the intake impeller 9 flows within the intake channel, aiding in heat dissipation and preventing external substances from reversing into the motor. Compared to existing protection methods, this bidirectional grate sealing structure more effectively isolates the internal and external environments of the motor, significantly improving the protection capability of the external rotor motor and extending its service life.

[0034] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A toothed sealing structure for enhancing the protection of an external rotor motor, characterized in that, The device includes a rotor assembly (1) and a stator assembly (2). The rotor assembly (1) includes a magnet sleeve (3). The outer surface of the magnet sleeve (3) is provided with a radially extending radial rib (4) and a first axial rib (5) extending axially. The stator assembly (2) includes an end cover (6). The bottom surface of the end cover (6) is provided with a second axial rib (7). The inner side of the second axial rib (7) is provided with an annular rib (8). The first axial rib (5) is located between the second axial rib (7) and the annular rib (8).

2. The toothed sealing structure for enhancing the protection of an external rotor motor according to claim 1, characterized in that, The horizontal height of the radial rib (4) is greater than the horizontal height of the first axial rib (5), and the radial rib (4) forms a clearance fit with the inner wall of the end cap (6).

3. The toothed sealing structure for enhancing the protection of an external rotor motor according to claim 2, characterized in that, The end of the second axial rib (7) extends to the root of the radial rib (4), the second axial rib (7) and the radial rib (4) form a clearance fit, and the annular rib (8) and the first axial rib (5) of the magnet sleeve (3) form a clearance fit.

4. The toothed sealing structure for enhancing the protection of an external rotor motor according to claim 3, characterized in that, The radial ribs (4) are evenly distributed along the circumference of the magnet sleeve (3), and the first axial ribs (5) are arranged at radial intervals along the magnet sleeve (3). The first axial ribs (5) form a clearance fit with the bottom of the end cap (6).

5. The toothed sealing structure for enhancing the protection of an external rotor motor according to claim 1, characterized in that, The length direction of the second axial rib (7) is parallel to the rotation axis of the rotor assembly (1).

6. The toothed sealing structure for enhancing the protection of an external rotor motor according to claim 4, characterized in that, The magnet sleeve (3) is fixed to the rotor cup of the rotor assembly (1) by adhesive bonding. The first axial rib (5) and the radial rib (4) are integrally formed on the outer surface of the magnet sleeve (3).

7. The toothed sealing structure for enhancing the protection of an external rotor motor according to claim 6, characterized in that, An air inlet impeller (9) is also fixedly installed on the rotor cup of the rotor assembly (1). The air outlet of the air inlet impeller (9) forms an air inlet channel with the gap between the radial rib (4) and the end cover (6), the gap between the second axial rib (7) and the radial rib (4), the gap between the first axial rib (5) and the bottom of the end cover (6), and the gap between the annular rib (8) and the first axial rib (5) of the magnet sleeve (3).

8. The toothed sealing structure for enhancing the protection of an external rotor motor according to claim 1, characterized in that, The rotor assembly (1) has an air outlet (10) at the bottom of the rotor cup.

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