Rotor core, motor, compressor and air conditioner

Abstract

The application provides a rotor core, a motor, a compressor and an air conditioner. The rotor core comprises a core body (1), and a noise reduction structure is arranged on the core body (1). The noise reduction structure comprises an air inlet channel (2), a resonance cavity (3) and an air outlet channel (4). Air flows into the resonance cavity (3) through the air inlet channel (2), resonates and slows down, and then flows out through the air outlet channel (4). According to the rotor core, air flow noise can be effectively reduced.

Description

Technical Field

[0001] This application relates to the field of compressor technology, specifically to a rotor core, motor, compressor, and air conditioner. Background Technology

[0002] Currently, during the operation of a compressor, the rotor rotates at high speed, generating a large airflow. The high-speed airflow passes through the air gap between the stator and rotor, and rubs against the surfaces of the stator and rotor, resulting in high aerodynamic noise. The sound power of this noise is proportional to the sixth power of the airflow velocity. Therefore, when the rotor is running at high speed, the airflow velocity is very high, which also generates high airflow noise. Summary of the Invention

[0003] Therefore, the technical problem to be solved by this application is to provide a rotor core, motor, compressor and air conditioner that can effectively reduce airflow noise.

[0004] To address the aforementioned issues, this application provides a rotor core comprising a core body and a noise reduction structure. The noise reduction structure includes an intake channel, a resonant cavity, and an exhaust channel. Airflow enters the resonant cavity through the intake channel for resonant deceleration and then flows out through the exhaust channel.

[0005] Preferably, the iron core body is also provided with a flow channel, and the air intake channel and the resonant cavity are connected through the flow channel.

[0006] Preferably, the air intake channel and the resonant cavity extend along the axial direction of the iron core body, and the extension direction of the flow channel is perpendicular to the central axis of the iron core body, or the extension direction of the flow channel forms a preset angle with the cross-section of the iron core body.

[0007] Preferably, the air intake channel and the resonant cavity are directly connected, and the projection of the air intake channel in the axial direction of the iron core body overlaps with the projection of the resonant cavity in the axial direction of the iron core body at the edge position.

[0008] Preferably, the cross-sectional shape of the intake passage, resonant cavity, and / or exhaust passage is circular or polygonal.

[0009] Preferably, the number of air intake channels is N1, the number of resonant cavities is N2, and 0.25≤N2 / N1≤1.

[0010] Preferably, there are two air intake channels corresponding to a single resonant cavity, with cross-sectional areas of S2 and S3 respectively, and the cross-sectional area of ​​the resonant cavity is S1, where S1≤3*(S2+S3)≤2S1.

[0011] Preferably, the number of exhaust channels is greater than or equal to the number of resonant cavities, and the number of exhaust channels connected to each resonant cavity is less than or equal to 4.

[0012] Preferably, the axial height of the air intake channel is H3, and the axial height of the iron core body is H1, where 0.2H1≤H3≤0.4H1.

[0013] Preferably, the angle between the extension direction of the exhaust channel and the cross-section of the iron core body is α, where 45°≤α≤90°.

[0014] Preferably, the number of flow passages is greater than or equal to the number of intake passages, and the number of flow passages connected to each intake passage is less than or equal to 3.

[0015] Preferably, the flow channel is a tubular structure.

[0016] Preferably, the inner wall of the flow channel is provided with protrusions and / or grooves.

[0017] According to another aspect of this application, an electric motor is provided, including a rotor core, which is the rotor core described above.

[0018] According to another aspect of this application, a compressor is provided, including a rotor core, which is the rotor core described above.

[0019] According to another aspect of this application, an air conditioner is provided, including a rotor core, which is the rotor core described above.

[0020] The rotor core provided in this application includes a core body with a noise reduction structure. This structure includes an intake channel, a resonant cavity, and an exhaust channel. Airflow enters the resonant cavity through the intake channel, resonates and decelerates, and then flows out through the exhaust channel. The rotor core has the intake channel, resonant cavity, and exhaust channel sequentially arranged along the gas flow direction. This allows airflow to enter through the intake channel, resonate and decelerate within the resonant cavity, and then exit through the exhaust channel. This effectively absorbs most of the airflow noise generated during high-speed rotor operation within the noise reduction structure, reducing aerodynamic noise during motor operation, especially at high speeds. By incorporating the noise reduction structure, motor noise is effectively reduced, motor windage loss is decreased, and motor efficiency is further improved. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the rotor core structure according to one embodiment of this application;

[0022] Figure 2 This is a perspective structural diagram of a rotor core according to an embodiment of this application;

[0023] Figure 3 This is a perspective structural diagram of a rotor core according to an embodiment of this application;

[0024] Figure 4This is a perspective view of a noise reduction structure of a rotor core according to an embodiment of this application;

[0025] Figure 5 This is a perspective view of a noise reduction structure of a rotor core according to an embodiment of this application;

[0026] Figure 6 This is a schematic diagram of a noise reduction structure for a rotor core according to an embodiment of this application;

[0027] Figure 7 This is a dimensional diagram of the noise reduction structure of the rotor core according to one embodiment of this application;

[0028] Figure 8 This is a dimensional diagram of the noise reduction structure of the rotor core according to one embodiment of this application;

[0029] Figure 9 This is a schematic diagram of a noise reduction structure for a rotor core according to an embodiment of this application;

[0030] Figure 10 This is a schematic diagram of a noise reduction structure for a rotor core according to an embodiment of this application;

[0031] Figure 11 This is a schematic diagram of a noise reduction structure for a rotor core according to an embodiment of this application;

[0032] Figure 12 This is a schematic diagram of the flow channel structure of a rotor core according to an embodiment of this application;

[0033] Figure 13 This is a schematic diagram of the flow channel structure of a rotor core according to an embodiment of this application;

[0034] Figure 14 This is a schematic diagram of the flow channel structure of a rotor core according to an embodiment of this application;

[0035] Figure 15 This is a schematic diagram of the flow channel structure of a rotor core according to an embodiment of this application;

[0036] Figure 16 This is a schematic diagram of the flow channel structure of a rotor core according to an embodiment of this application;

[0037] Figure 17 This is a schematic diagram of the resonant cavity structure of a rotor core according to an embodiment of this application;

[0038] Figure 18 This is a schematic diagram of the resonant cavity structure of a rotor core according to an embodiment of this application;

[0039] Figure 19 This is a schematic diagram of the resonant cavity structure of a rotor core according to an embodiment of this application;

[0040] Figure 20 This is a schematic diagram of a noise reduction structure for a rotor core according to an embodiment of this application;

[0041] Figure 21 This is a schematic diagram of a noise reduction structure for a rotor core according to an embodiment of this application;

[0042] Figure 22 This is a schematic diagram of a noise reduction structure for a rotor core according to an embodiment of this application.

[0043] The reference numerals in the attached figures are as follows:

[0044] 1. Iron core body; 2. Air intake channel; 3. Resonance cavity; 4. Exhaust channel; 5. Flow channel; 6. Protrusion; 7. Rotor inner hole; 8. Magnet. Detailed Implementation

[0045] See also Figures 1 to 22 As shown, according to an embodiment of this application, the rotor core includes a core body 1, and a noise reduction structure is provided on the core body 1. The noise reduction structure includes an air intake channel 2, a resonance cavity 3, and an exhaust channel 4. The airflow enters the resonance cavity 3 through the air intake channel 2 for resonance deceleration, and then flows out through the exhaust channel 4.

[0046] The rotor core is arranged with an intake channel 2, a resonant cavity 3, and an exhaust channel 4 in sequence along the gas flow direction. When the rotor is running at high speed, the airflow enters through the intake channel 2, resonates and decelerates in the resonant cavity 3, and is then discharged through the exhaust channel 4. This absorbs the high-speed airflow, effectively absorbing most of the airflow noise generated when the rotor is running at high speed. This can reduce the aerodynamic noise of the motor, especially when the rotor is running at high speed. By setting up the noise reduction structure, the noise of the motor is effectively reduced, the wind wear loss of the motor is reduced, and the efficiency of the motor is further improved.

[0047] In this embodiment, the noise reduction structure is built into the iron core body 1, preferably located on the inner circumference of the magnet, so as not to affect the magnetic circuit of the magnet, effectively ensuring the magnetic circuit structure of the magnet and ensuring the magnetic performance of the motor. In addition, the noise reduction structure built into the iron core body 1 also allows the airflow to carry away the heat inside the rotor iron core when flowing through the noise reduction structure, thus cooling the rotor iron core.

[0048] In one embodiment, the iron core body 1 is also provided with an overflow channel 5, and the air intake channel 2 and the resonant cavity 3 are connected through the overflow channel 5.

[0049] In one embodiment, the air intake channel 2 and the resonant cavity 3 extend along the axial direction of the iron core body 1, and the extension direction of the flow channel 5 is perpendicular to the central axis of the iron core body 1, or the extension direction of the flow channel 5 forms a preset angle with the cross-section of the iron core body 1.

[0050] In this embodiment, the intake channel 2 and the resonant cavity 3 are not directly connected, but indirectly connected through the flow channel 5. After entering the intake channel 2, the airflow is deflected through the flow channel 5 and then enters the resonant cavity 3 for resonant deceleration, achieving a noise reduction effect. In this embodiment, by setting the flow channel 5, the airflow can pass through more layers of obstruction within the noise reduction structure, achieving multiple reflections. Through the cooperation between the resonant cavity 3 and the flow channel 5, the airflow noise generated by high-speed airflow can be better absorbed and reduced, resulting in a good noise reduction effect.

[0051] In this embodiment, the core body 1 is formed by stacking rotor laminations. The noise reduction structure can be integrally stamped on the rotor laminations during the rotor lamination stamping process, so that the preset noise reduction structure can be obtained after the rotor laminations are stacked.

[0052] In one embodiment, the intake channel 2 and the resonant cavity 3 are directly connected, and the projection of the intake channel 2 onto the axial direction of the core body 1 overlaps with the projection of the resonant cavity 3 onto the axial direction of the core body 1 at the edge position. In this embodiment, since the intake channel 2 and the resonant cavity 3 are staggered and their edges are connected, the airflow can be prevented from flowing directly out of the resonant cavity 3 and the exhaust channel 4 along the axial direction, ensuring the deflection effect of the airflow, thereby giving the noise reduction structure a good noise reduction effect.

[0053] In one embodiment, the cross-sectional shape of the intake passage 2, the resonant cavity 3, and / or the exhaust passage 4 is circular or polygonal.

[0054] The number of intake channels 2 can be one or more, designed according to requirements, with a quantity of N1. The resonant cavity 3 in the noise reduction structure is one or more cavity structures, connected to the intake channel 2. The shape of the resonant cavity 3 can be cylindrical or polygonal, and it is a hollow structure. The number of resonant cavities 3 can be one or more, with a quantity of N2, where 0.25≤N2 / N1≤1. This ensures that the number of intake channels 2 is not less than the number of resonant cavities 3, allowing the airflow entering the resonant cavity 3 through the intake channel 2 to collide and resonate within the resonant cavity 3, further improving the resonance noise reduction effect of the resonant cavity 3.

[0055] The number of exhaust channels 4 is greater than or equal to the number of resonant cavities 3, and the number of exhaust channels 4 connected to each resonant cavity 3 is less than or equal to 4.

[0056] In one embodiment, the area of ​​a single resonant cavity 3 is less than or equal to three times the sum of the areas of all its corresponding air intake channels 2, and twice the area of ​​a single resonant cavity 3 is greater than or equal to three times the sum of the areas of all its corresponding air intake channels 2.

[0057] In one embodiment, a single resonant cavity 3 corresponds to two air intake channels 2, with cross-sectional areas of S2 and S3 respectively, and the cross-sectional area of ​​the resonant cavity 3 is S1, where S1≤3*(S2+S3)≤2S1. This limitation ensures that the area of ​​the resonant cavity 3 is greater than the sum of the areas of the air intake channels 2, resulting in a significant area change when the airflow enters the resonant cavity 3 from the air intake channels 2, thus effectively slowing down and reducing noise.

[0058] S2 and S3 can be equal or unequal. The number of various cavities in the noise reduction structure can be the same or different. The number of combinations of various cavities can be diversified. For example, one resonant cavity 3 can be matched with multiple air intake channels 2, or one resonant cavity 3 can be matched with one air intake channel 2. The combination can be designed according to the requirements.

[0059] In one embodiment, the axial height of the air intake channel 2 is H3, and the axial height of the iron core body 1 is H1, where 0.2H1≤H3≤0.4H1. This limits the axial height of the air intake channel 2, preventing it from being too high. This ensures that the iron core body 1 has sufficient axial height to accommodate the resonant cavity 3, thereby enabling the resonant cavity 3 to have a better resonance noise reduction effect.

[0060] In one embodiment, the angle between the extension direction of the exhaust channel 4 and the cross-section of the iron core body 1 is α, where 45°≤α≤90°. Limiting the extension direction of the exhaust channel 4 to this angular range helps to reduce the radial air pressure difference and can effectively reduce noise.

[0061] In one embodiment, the number of flow passages 5 is greater than or equal to the number of intake passages 2, and the number of flow passages 5 connected to each intake passage 2 is less than or equal to 3.

[0062] In one embodiment, the flow channel 5 is a tubular structure. The cross-sectional shape of the flow channel 5 can be circular, elliptical, or polygonal. The inner wall of the flow channel 5 can be provided with protrusions 6 and / or grooves, thereby slowing down the airflow during its flow and absorbing noise during the airflow process, thus improving noise reduction. The cross-sectional shapes of the protrusions 6 and grooves can be regular shapes such as cylindrical, polygonal, elliptical, or hemispherical, or they can be irregular shapes.

[0063] In some embodiments, the rotor core body 1 is provided with a rotor inner hole 7, and the air intake channel 2, the resonance cavity 3 and the exhaust channel 4 are all spaced apart from the rotor inner hole 7.

[0064] In one embodiment, there are two intake channels 2, one resonant cavity 3 and one exhaust channel 4, and two flow channels 5. Each intake channel 2 is connected to the resonant cavity 3 through a flow channel 5. The two intake channels 2 are located at both ends of the same diameter of the rotor inner hole 7. When the airflow enters the resonant cavity 3 from the two flow channels 5 through the intake channels 2, it will form a counterflow, thereby canceling out some of the airflow noise and achieving a better noise reduction effect.

[0065] In one embodiment, there are two intake channels 2, two resonant cavities 3, and two exhaust channels 4, and four flow channels 5. Each intake channel 2 is connected to two resonant cavities 3 through two flow channels 5. The two intake channels 2 are located at both ends of the same diameter of the rotor inner hole 7, and the two resonant cavities 3 are located at both ends of the same diameter of the rotor inner hole 7. The diameter of the resonant cavity 3 is perpendicular to the diameter of the intake channel 2. The exhaust channel 4 is set in a one-to-one correspondence with the resonant cavity 3.

[0066] In one embodiment, there are four intake channels 2, four exhaust channels 4, and four flow channels 5. The resonant cavity 3 is an annular cavity, which is coaxially arranged with the inner hole 7 of the rotor. The intake channels 2 are evenly arranged along the outer circumference of the annular cavity. Each intake channel 2 is connected to the resonant cavity 3 through a flow channel 5. The exhaust channels 4 are evenly arranged along the circumference of the resonant cavity 3 and are arranged alternately with the intake channels 2 along the circumference of the resonant cavity 3.

[0067] In one embodiment, the cross-sectional shape of the resonant cavity 3 is a petal-shaped structure composed of multiple identical circles.

[0068] In one embodiment, the cross-sectional shape of the resonant cavity 3 is a gourd shape composed of two circles of different diameters.

[0069] In one embodiment, the cross-sectional shape of the resonant cavity 3 is an irregular structure composed of a combination of circles and rectangles.

[0070] In one embodiment, the inlet of the intake passage 2 has a stepped structure, and the outlet of the exhaust passage 4 has a stepped structure.

[0071] In one embodiment, the inlet of the intake passage 2 is a conical structure, and the outlet of the exhaust passage 4 is a conical structure.

[0072] In one embodiment, the inlet of the intake channel 2 is a concave arc-shaped structure, and the exhaust channel 4 is inclined relative to the resonant cavity 3.

[0073] In one embodiment, the end of the intake channel 2 extends beyond the edge of the flow channel 5, and the edge of the resonant cavity 3 is flush with the edge of the flow channel 5.

[0074] In one embodiment, the end of the intake channel 2 extends beyond the edge of the flow channel 5, and the edge of the resonant cavity 3 extends beyond the edge of the flow channel 5.

[0075] In one embodiment, an air intake channel 2 is connected to the resonant cavity 3 through two flow channels 5, and the two flow channels 5 are spaced apart along the axial direction of the iron core body 1.

[0076] According to an embodiment of this application, the motor includes a rotor core, which is the rotor core described above.

[0077] In this embodiment, a magnetic slot is provided on the rotor core, and a magnet 8 is provided in the magnetic slot. The noise reduction structure is located between the magnet 8 and the rotor inner hole 7, so as not to affect the magnetic circuit channel between the magnet 8 and the stator core, thereby ensuring the magnetic performance of the motor.

[0078] According to an embodiment of this application, the compressor includes a rotor core, which is the rotor core described above.

[0079] According to an embodiment of this application, the air conditioner includes a rotor core, which is the rotor core described above.

[0080] Air conditioners may also include the aforementioned motor or compressor.

[0081] It will be readily understood by those skilled in the art that the aforementioned advantageous methods can be freely combined and superimposed without conflict.

[0082] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application. The above are merely preferred embodiments of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this application, and these improvements and modifications should also be considered within the protection scope of this application.

Claims

1. A rotor core, characterized in that, The system includes an iron core body (1), on which a noise reduction structure is provided. The noise reduction structure includes an air intake channel (2), a resonant cavity (3), and an exhaust channel (4). The airflow enters the resonant cavity (3) through the air intake channel (2) and resonates and decelerates, and then flows out through the exhaust channel (4). The iron core body (1) is also provided with a flow passage (5), through which the air intake channel (2) and the resonant cavity (3) are connected. The air intake channel (2) and the resonant cavity (3) extend along the axial direction of the iron core body (1), and the extension direction of the flow channel (5) is perpendicular to the central axis of the iron core body (1), or the extension direction of the flow channel (5) forms a preset angle with the cross section of the iron core body (1). The air intake channel (2) and the resonant cavity (3) are directly connected. The projection of the air intake channel (2) in the axial direction of the iron core body (1) and the projection of the resonant cavity (3) in the axial direction of the iron core body (1) overlap at the edge position. The inner wall of the flow channel (5) is provided with protrusions (6) and / or grooves. Each of the resonant cavities (3) has two air intake channels (2). When the airflow enters the resonant cavity (3) through the two air intake channels (2), it will form a countercurrent. The noise reduction structure is located between the magnet and the inner hole of the rotor in the iron core body (1). After the airflow enters the air intake channel (2), it will be deflected through the flow channel (5) and enter the resonance cavity (3) for resonance deceleration.

2. The rotor core according to claim 1, characterized in that, The cross-sectional shape of the intake channel (2), the resonant cavity (3) and / or the exhaust channel (4) is circular or polygonal.

3. The rotor core according to claim 1, characterized in that, The number of air intake channels (2) is N1, and the number of resonant cavities (3) is N2, where 0.25≤N2 / N1≤1.

4. The rotor core according to claim 1, characterized in that, The cross-sectional areas of the two air intake channels (2) are S2 and S3 respectively, and the cross-sectional area of ​​the resonant cavity (3) is S1, where S1≤3*(S2+S3)≤2S1.

5. The rotor core according to claim 1, characterized in that, The number of exhaust channels (4) is greater than or equal to the number of resonant cavities (3), and the number of exhaust channels (4) connected to each resonant cavity (3) is less than or equal to 4.

6. The rotor core according to claim 1, characterized in that, The axial height of the air intake channel (2) is H3, and the axial height of the iron core body (1) is H1, where 0.2H1≤H3≤0.4H1.

7. The rotor core according to claim 1, characterized in that, The angle between the extension direction of the exhaust channel (4) and the cross-section of the iron core body (1) is α, where 45°≤α≤90°.

8. The rotor core according to claim 1, characterized in that, The number of the flow passages (5) is greater than or equal to the number of the intake passages (2), and the number of the flow passages (5) connected to each intake passage (2) is less than or equal to 3.

9. The rotor core according to claim 1, characterized in that, The flow channel (5) is a tubular structure.

10. An electric motor, comprising a rotor core, characterized in that, The rotor core is the rotor core according to any one of claims 1 to 9.

11. A compressor comprising a rotor core, characterized in that, The rotor core is the rotor core according to any one of claims 1 to 9.

12. An air conditioner, comprising a rotor core, characterized in that, The rotor core is the rotor core according to any one of claims 1 to 9.

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