Rotor balancing block, motor rotor, motor, compressor, air conditioner

Abstract

The application provides a rotor balance block, a motor rotor, a motor, a compressor and an air conditioner, wherein the rotor balance block comprises a balance block body, a first windward end face and a first leeward end face are formed on the balance block body, and an airflow flow channel is further configured on the balance block body, the airflow flow channel is communicated with the first windward end face and the first leeward end face, and when a motor rotor corresponding to the rotor balance block rotates, airflow can flow into the airflow flow channel from the first windward end face and flow out of the airflow flow channel from the first leeward end face. According to the application, the area of mixed fluid colliding with the balance block body is reduced, the air resistance of the refrigerant fluid to the rotor balance block is reduced, the flow speed of the mixed fluid is accelerated, the stability of the motor is improved, the vibration and noise of the compressor are reduced, and the reliability of the compressor is ensured.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of compressor design, and particularly relates to a rotor balance block, a motor rotor, a motor, a compressor and an air conditioner. BACKGROUND

[0002] A compressor is a core component of many refrigeration devices, and plays a vital role in the application of air conditioners. A rotary roller compressor is powered by the rotation of a motor, and the operation performance of the motor directly affects the overall performance of the compressor. The stability of the compressor is closely related to the stability of the motor.

[0003] Generally, the crankshaft of the compressor is directly connected with the motor output shaft, and the roller on the crankshaft is rotated by the motor to compress refrigerant in the cylinder of the compressor, so as to realize the process of converting electric energy into mechanical energy and then into pressure energy. Since the eccentric part on the roller and the crankshaft is not on the same straight line as the rotation center of the motor rotating shaft, the eccentric part on the crankshaft will drive the motor output shaft to deviate from the position of the rotation center during high-speed rotation of the motor, thereby greatly affecting the stability of the motor. In order to increase the stability of the motor and avoid the influence of the eccentric part of the crankshaft on the operation performance of the motor, a balance block is usually arranged at both ends of the motor rotor. When the motor rotates at a high speed to drive the crankshaft, the balance block can offset the radial force of the eccentric part of the crankshaft on the output shaft, so that the radial force on the output shaft of the motor is balanced during operation, thereby ensuring the stability of the motor and the reliability of the compressor.

[0004] When the motor is running, the lubricating oil and the mixed gas-liquid in the compressor also flow with the rotation of the motor. The mixed fluid collides with the windward surface of the rotor balance block, which forms a large flow resistance to the mixed fluid, generates a strong stagnation phenomenon, and also increases the resistance of the motor rotor rotation, thereby causing problems such as increased vibration and noise of the compressor. SUMMARY

[0005] Therefore, the application provides a rotor balance block, a motor rotor, a motor, a compressor and an air conditioner to overcome the problems in the prior art that the mixed fluid collides with the windward surface of the rotor balance block, which forms a large flow resistance to the mixed fluid, generates a strong stagnation phenomenon, increases the resistance of the motor rotor rotation, and causes problems such as increased vibration and noise of the compressor.

[0006] To solve the above problems, the application provides a rotor balance block, which comprises a balance block body, a first windward end face and a first leeward end face are formed on the balance block body, and an airflow flow channel is further configured on the balance block body and communicates with the first windward end face and the first leeward end face, and when a motor rotor corresponding to the rotor balance block rotates, airflow can flow into the airflow flow channel from the first windward end face and flow out of the airflow flow channel from the first leeward end face.

[0007] In some embodiments, the airflow flow channel is coaxially arranged with the motor rotor.

[0008] In some embodiments, the flow area S2 of the airflow flow channel remains consistent along the extension direction thereof, the balance block body is symmetric about a radial symmetry plane, the cross-sectional area of the balance block body on the radial symmetry plane is S1, and 0.4*S1≤S2≤0.75*S1.

[0009] In some embodiments, S2=0.6*S1.

[0010] In some embodiments, the flow cross section of the airflow flow channel is at least one of a circular shape and an elliptical shape, or the airflow flow channel has multiple airflow flow channels.

[0011] In some embodiments, when the airflow flow channel is one and the flow cross section is a circular shape, the balance block body has a first inner circular arc surface coaxially arranged with the motor rotor, the radius of the flow channel center line of the airflow flow channel is L4, the balance block body further has a first outer circular arc surface coaxially arranged with the first inner circular arc surface, the radius of the first inner circular arc surface is r3, the radius of the first outer circular arc surface is r4, and L4=(r4+r3) / 2.

[0012] In some embodiments, the balance block body further has a first connecting portion on the side of the first windward end face, and the first connecting portion is provided with a first connecting hole.

[0013] In some embodiments, the balance block body further has a first inner surface and a first outer surface oppositely arranged, the first inner arc surface and the first outer arc surface are connected between the first inner surface and the first outer surface respectively, the first connecting portion has a second inner surface coinciding with the first inner surface and a second outer surface arranged in parallel with the second inner surface, in the radial section of the airflow passage, the vertical distance between the first outer surface and the flow passage center line is L2, the vertical distance between the second outer surface and the flow passage center line is L1, the vertical distance between the first inner surface and the flow passage center line is L3, the radius of the airflow passage is r5, L1=L2, and / or, L2=0.5*L3, and / or, L2=2*r5; and / or, L3=1.5*L1+L2.

[0014] In some embodiments, the first connecting portion has a second windward end surface, which is projected on the first inner surface, the second windward end surface is semicircular with a radius of r2, and the first windward end surface is semicircular with a radius of r1.

[0015] In some embodiments, r1=r2.

[0016] In some embodiments, the first windward end surface has a first center, the second windward end surface has a second center, the first center and the second center are both on the flow passage center line of the airflow passage, the first center and the center of the balance block body form a first connecting line, the second center and the center of the balance block body form a second connecting line, the included angle between the first connecting line and the second connecting line is α, 45°≤α≤75°; and / or, the radius of the first connecting hole is r6, r1=2.25*r6; and / or, the first connecting hole is concentric with the second windward end surface.

[0017] In some embodiments, the second inner surface and the second outer surface have a second inner arc surface and a second outer arc surface therebetween, wherein the second inner arc surface is on the same arc surface as the first inner arc surface, the second outer arc surface is on the same arc surface as the first outer arc surface, and the free end of the second inner arc surface is connected to the free end of the second outer arc surface through the second windward end surface.

[0018] In some embodiments, the connecting line between the second outer surface and the second inner arc surface is rounded to form a first rounding structure; and / or, the connecting line between the second outer surface and the second outer arc surface is rounded to form a second rounding structure; and / or, the connecting line between the second outer surface and the second windward end surface is rounded to form a third rounding structure.

[0019] In some embodiments, the first rounding structure, the second rounding structure, and the third rounding structure have the same rounding radius.

[0020] In some embodiments, the fourth rounding structure is formed by rounding the connecting line between the second outer surface and the first windward end surface.

[0021] In some embodiments, the fourth rounding structure has a rounding radius r12, the first rounding structure has a rounding radius r11, and r11=1.25*r12.

[0022] In some embodiments, the fifth rounding structure is formed by rounding the connecting line between the first outer surface and the first inner arc surface; and / or, the sixth rounding structure is formed by rounding the connecting line between the first outer surface and the first outer arc surface; and / or, the seventh rounding structure is formed by rounding the connecting line between the first outer surface and the first windward end surface.

[0023] In some embodiments, the fifth rounding structure, the sixth rounding structure, and the seventh rounding structure have the same rounding radius; and / or, the fifth rounding structure has a rounding radius r13, and r13=r12.

[0024] In some embodiments, the balance block body further has a second connecting portion on the side of the first leeward end surface, and the second connecting portion is provided with a second connecting hole.

[0025] In some embodiments, when the balance block body is symmetrical about a radial symmetry plane, the first connecting portion and the second connecting portion are symmetrical about the radial symmetry plane.

[0026] In some embodiments, the first inner surface, a second inner surface of the first connecting portion, and a third inner surface of the second connecting portion have a total area S3, and the first outer surface has an area S4, and 0.26*S3≤S4≤0.55*S3.

[0027] The application further provides an electric machine rotor comprising the rotor balance block.

[0028] The application further provides an electric machine comprising the electric machine rotor.

[0029] The application further provides a compressor comprising the electric machine.

[0030] The application further provides an air conditioner comprising the compressor.

[0031] The rotor balance block, motor rotor, motor, compressor and air conditioner provided by the application can make the mixed fluid flow out of the first leeward end face directly, greatly reduce the area of the mixed fluid colliding with the balance block body, reduce the wind resistance of the refrigerant fluid to the rotor balance block, accelerate the flow speed of the mixed fluid, improve the stability of the motor, reduce the vibration and noise of the compressor, ensure the reliability of the compressor and the like. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 It is a perspective structural schematic view of the rotor balance block of the embodiment of the application.

[0033] Figure 2 It is a front view of the rotor balance block. Figure 1

[0034] Figure 3 It is a sectional view of A-A in the rotor balance block. Figure 2

[0035] Figure 4 It is a rounded structure schematic view of the rotor balance block in the embodiment. Figure 1

[0036] Figure 5 It is a structure schematic view of the rotor balance block of another embodiment of the application.

[0037] Figure 6 It is a structure schematic view of the rotor balance block of another embodiment of the application.

[0038] Figure 7 It is a structure schematic view of the rotor balance block of another embodiment of the application.

[0039] Figure 8 It is a comparison view of the oil circulation rate of the compressor adopting the technical scheme of the application and the compressor in the related art.

[0040] Figure 9 It is a comparison view of the total noise value of the compressor adopting the technical scheme of the application and the compressor in the related art.

[0041] The signs are as follows:

[0042] 1, balance block body; 11, first inner arc surface; 12, first outer arc surface; 13, first inner surface; 14, first outer surface; 15, first windward end face; 16, first leeward end face; 2, air flow channel; 3, first connecting part; 31, first connecting hole; 32, second windward end face; 33, second inner surface; 34, second outer surface; 4, second connecting part; 41, second connecting hole. DETAILED DESCRIPTION

[0043] For reference​​​Figures 1 to 9 As shown, according to the embodiment of the present application, a rotor balance block is provided, comprising a balance block body 1, a first inner arc surface 11, a first outer arc surface 12 and oppositely arranged first inner surface 13 (for abutting with the shaft end of the rotor core of the motor rotor) and first outer surface 14, wherein the first inner arc surface 11 and the first outer arc surface 12 are coaxially arranged with the motor rotor, and the first inner arc surface 11 and the first outer arc surface 12 are respectively connected between the first inner surface 13 and the first outer surface 14, the balance block body 1 is formed with a first windward end face 15 and a first leeward end face 16, the first windward end face 15 is formed at a corresponding circumferential one end (for example, the first end) of the first inner arc surface 11 and the first outer arc surface 12, and the first leeward end face 16 is formed at a corresponding circumferential other end (for example, the second end) of the first inner arc surface 11 and the first outer arc surface 12, and the balance block body 1 is further configured with an airflow channel 2, the airflow channel 2 is communicated with the first windward end face 15 and the first leeward end face 16, and when the motor rotor corresponding to the rotor balance block rotates, the refrigerant airflow can flow into the airflow channel 2 from the first windward end face 15 and flow out of the airflow channel 2 from the first leeward end face 16. In this technical solution, the mixed fluid (i.e. the refrigerant airflow) opposite to the rotation direction of the motor rotor at the first windward end face 15 can directly flow out from the first leeward end face 16, greatly reducing the area of the mixed fluid colliding with the balance block body 1, reducing the wind resistance of the refrigerant fluid to the rotor balance block, accelerating the flow-through speed of the mixed fluid, improving the stability of the motor, reducing the vibration and noise of the compressor (or motor), and ensuring the reliability of the compressor.

[0044] In some embodiments, the airflow channel 2 is coaxially arranged with the first inner arc surface 11, and the airflow channel 2 is designed to be coaxial with the first inner arc surface 11, i.e. coaxial with the motor rotor. When the mixed fluid is driven by the motor rotor inside the compressor, this design can make the mixed fluid rotating coaxially with the motor rotor directly flow out of the airflow channel, further reducing the wind resistance of the rotor and the rotation resistance of the motor. When the mixed fluid flows out of the airflow channel, it can reduce the mixed fluid directly sprayed from the upper cavity of the compressor, ensuring the fluid pressure and lubrication effect of the internal structure of the compressor.

[0045] In some embodiments, the flow passage 2 has a constant cross-sectional area S2 along its extension direction, the balance block body 1 is symmetrical about a radial symmetry plane, the cross-sectional area of the balance block body 1 on the radial symmetry plane is S1, 0.4*S1≤S2≤0.75*S1, further, S2=0.6*S1. When S2 is too small, the outflow of the mixed fluid from the flow passage is too small, and the improvement effect is not obvious; when S2 is too large, in order to ensure the overall mass of the balance block required to offset the radial force of the crankshaft eccentric part on the output shaft of the motor, the overall height of the balance block needs to be increased or the density of the material for manufacturing the balance block needs to be increased, thereby increasing the manufacturing difficulty and cost.

[0046] The cross-sectional shape of the flow passage 2 can be various, in some embodiments, the cross-sectional shape of the flow passage 2 is at least one of a circle (for example, as shown in FIG. 7), an ellipse (for example, as shown in FIG. 8), or the like; or, the flow passage 2 has multiple flow passages, in this case, the cross-sectional shape of the multiple flow passages 2 can be unified as a circle (for example, as shown in FIG. 9), or the flow passage 2 can have different cross-sectional shapes, in other embodiments, as shown in FIG. 10, when the flow passage 2 has multiple flow passages, the flow passage 2 close to the first inner arc surface 11 has an opening towards the inner side of the first inner arc surface 11, and / or the flow passage 2 close to the first outer arc surface 12 has an opening towards the outer side of the first outer arc surface 12, thereby reducing the collision area of the mixed fluid with the first inner arc surface 11 and the first outer arc surface 12, and reducing the wind resistance of the balance block, and further reducing the rotation resistance of the motor. Figure 1 、 5 Figure 6 Figure 7 Figure 5

[0047] In some embodiments, when the flow passage 2 has one flow passage and the cross-sectional shape of the flow passage 2 is a circle, the radius of the flow passage center line of the flow passage 2 is L4, the balance block body 1 further has a first outer arc surface 12 coaxially arranged with the first inner arc surface 11, the radius of the first inner arc surface 11 is r3, the radius of the first outer arc surface 12 is r4, and L4=(r4+r3) / 2. In this technical solution, the flow passage center line of the flow passage 2 is located at the radial center position between the first inner arc surface 11 and the first outer arc surface 12, when the mixed fluid collides with the first windward end surface 15, a part of the fluid flows out through the flow passage 2, and the preferred central position can make the flow rates of the mixed fluid on both sides of the first inner arc surface 11 and the first outer arc surface 12 the same, so that the fluid pressures on both sides of the balance block are consistent, and the rotor is more stable during rotation, and further reduces the vibration and noise of the compressor.

[0048] ​​​​In some embodiments, the balance block body 1 further has a first connecting portion 3 on the side of the first windward end face 15, and the first connecting portion 3 is provided with a first connecting hole 31, through which the rotor balance block can be connected with the motor rotor (specifically, the end face of the rotor core) without the need to set a corresponding connecting hole on the main structure of the balance block body 1, which is beneficial to maximize the setting size of the airflow channel 2 and to make the setting position more flexible, and is especially suitable for the case where a plurality of airflow channels 2 are set.

[0049] For reference Figure 3 In some embodiments, the first connecting portion 3 has a second inner surface 33 coinciding with the first inner surface 13 and a second outer surface 34 arranged in parallel with the second inner surface 33, and in the radial section of the airflow channel 2, the vertical distance between the first outer surface 14 and the flow channel center line is L2, the vertical distance between the second outer surface 34 and the flow channel center line is L1, the vertical distance between the first inner surface 13 and the flow channel center line is L3, the radius of the airflow channel 2 is r5, L1=L2, and / or L2=0.5*L3, and / or L2=2*r5, and / or L3=1.5*L1+L2. This technical solution can limit the flow channel center line of the airflow channel 2 to the axial center position of the rotor balance block. When the mixed fluid collides with the first windward end face 15, a part of the fluid flows out through the airflow channel 2, and the optimal central position can make the flow rates of the mixed fluid on both sides of the first inner arc surface 11 and the first outer arc surface 12 the same, make the fluid pressures on both sides of the balance block consistent, and make the rotor more stable during rotation, and further reduce the vibration and noise of the compressor. It can be understood that, by Figure 3 It can be known that the axial thickness h1 of the first connecting portion 3 is L3-L1, and the axial thickness h2 of the balance block body 1 protruding from the second outer surface 34 of the first connecting portion 3 is L1+L2.

[0050] In some embodiments, the first connecting portion 3 has a second windward end face 32, which is projected on the first inner surface 13, the first windward end face 15 is semicircular with a radius r2, and the second windward end face 32 is semicircular with a radius r1, and preferably r1 = r2. This design makes the first windward end face and the second windward end face of the balance block have the same structure, which can ensure the integrity of the balance block body structure. When the mixed fluid collides with the first windward end face and the second windward end face, the two end faces receive the same windward resistance, which ensures the fluid pressure in the compressor, so that the rotor is more stable during rotation, and the vibration and noise of the compressor are reduced. In this technical solution, by designing the windward end faces of the first windward end face 15 and the second windward end face 32 as semicircular structures, the damage to the oil film in the mixed gas stream colliding with the rotor during rotation of the motor can be effectively slowed down, thereby reducing the formation of liquid droplets, and further reducing the oil discharge amount of the compressor and improving the efficiency of the compressor. At the same time, it can also reduce the resistance of the rotor balance block during rotation, and reduce the vibration and noise of the compressor.

[0051] In some embodiments, the first windward end face 15 has a first center, and the second windward end face 32 has a second center, both of which are located on the flow passage center line of the airflow passage 2. The first center and the center of the balance block body 1 form a first connecting line, and the second center and the center of the balance block body 1 form a second connecting line. The included angle between the first connecting line and the second connecting line is α, and 45° ≤ α ≤ 75°. This design defines the included angle relationship between the second windward end face and the first windward end face in the circumference, which is to ensure that the boss has a certain height, so that the overall height of the balance block is moderate, and at the same time, the overall mass required by the balance block to offset the radial force of the crankshaft eccentric part on the motor output shaft can be ensured; and / or, the radius of the first connecting hole 31 is r6, and r1 = 2.25 * r6; and / or, the first connecting hole 31 is concentric with the second windward end face 32. In this way, when the balance block and the rotor are riveted and fixed by rivets, the rivets can effectively rivet the balance block on the rotor, so that the balance block can be stably connected to the rotor, and the vibration is reduced.

[0052] In some embodiments, the second inner surface and the second outer surface have a second inner circular surface and a second outer circular surface, wherein the second inner circular surface is on the same circular surface as the first inner circular surface 11, the second outer circular surface is on the same circular surface as the first outer circular surface 12, and the free end of the second inner circular surface is connected to the free end of the second outer circular surface by the second windward end surface 32. The first inner circular surface 11 and the second inner circular surface are on the same circular surface, and the first outer circular surface 12 and the second outer circular surface are on the same circular surface. It can be understood that both are coaxial with the rotation axis of the motor rotor, thereby further reducing the wind resistance of the rotor balance block during rotation.

[0053] In some embodiments, the connection line between the second outer surface and the second inner circular surface is rounded to form a first rounding structure; and / or, the connection line between the second outer surface and the second outer circular surface is rounded to form a second rounding structure; and / or, the connection line between the second outer surface and the second windward end surface 32 is rounded to form a third rounding structure, the rounding radii of the first rounding structure, the second rounding structure, and the third rounding structure are the same, and the connection line between the second outer surface and the first windward end surface 15 is rounded to form a fourth rounding structure. In this technical solution, the rounding structure can further reduce the wind resistance of the rotor balance block during rotation.

[0054] In some embodiments, the rounding radius of the fourth rounding structure is r12, and the rounding radius of the first rounding structure is r11, r11=1.25*r12. This design can reduce the wind resistance of the rotor balance block and the resistance of fluid collision with the windward end, and further reduce the vibration and noise of the compressor.

[0055] In some embodiments, the connection line between the first outer surface 14 and the first inner circular surface 11 is rounded to form a fifth rounding structure; and / or, the connection line between the first outer surface 14 and the first outer circular surface 12 is rounded to form a sixth rounding structure; and / or, the connection line between the first outer surface 14 and the first windward end surface 15 is rounded to form a seventh rounding structure. In this technical solution, the rounding structure can further reduce the wind resistance of the rotor balance block during rotation.

[0056] In some embodiments, the fifth rounding structure, the sixth rounding structure, and the seventh rounding structure have the same rounding radius; and / or, the rounding radius of the fifth rounding structure is r13, r13=r12, so as to facilitate the processing of the rounding structure.

[0057] In some embodiments, the balance block body 1 further has a second connecting portion 4 on the side of the first leeward end surface 16, and the second connecting portion 4 is provided with a second connecting hole 41. Preferably, the first connecting portion 3 and the second connecting portion 4 are symmetrical about the radial symmetry plane. In this way, the overall structure of the rotor balance block is symmetrical, which facilitates the play of the counterweight balancing effect.

[0058] In some embodiments, the first inner surface 13, the second inner surface of the first connecting portion 3, and the third inner surface of the second connecting portion 4 have a total area of S3, and the area of the first outer surface 14 is S4, 0.26*S3≤S4≤0.55*S3. This technical solution can reduce the windward resistance of the rotor balance block during rotation, ensure the overall mass required by the balance block when offsetting the radial force of the crankshaft eccentric portion on the output shaft of the motor, and further ensure that the radial force on the output shaft of the motor reaches a balanced state during operation, and improve the stability of the motor and the reliability of the compressor.

[0059] According to the embodiments of the present application, a motor rotor is also provided, which comprises the above rotor balance block.

[0060] According to the embodiments of the present application, a motor is also provided, which comprises the above motor rotor.

[0061] According to the embodiments of the present application, a compressor is also provided, which comprises the above motor.

[0062] According to the embodiments of the present application, an air conditioner is also provided, which comprises the above compressor.

[0063] In order to verify the technical solutions of the present application, the inventors conducted relevant comparative tests, as shown in Figure 8 and 9 The compressor adopting the technical solutions of the present application reduces the oil circulation rate from 1.82% of the prior art to 0.28%, which indicates that the oil discharge amount of the compressor is significantly reduced; and the noise is reduced from 68dB of the prior art to 62dB, and the noise level is significantly reduced.

[0064] Those skilled in the art will readily understand that the above advantageous modes can be freely combined and superimposed without conflict.

[0065] The above merely describes the preferred embodiments of the present application, but should not be used to limit the present application, and any modification, equivalent replacement, and improvement made within the spirit and principle of the present application should be included in the protection scope of the present application. The above merely describes the preferred embodiments of the present application, but should not be used to limit the present application, and any modification, equivalent replacement, and improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A rotor balance weight comprising a balance weight body (1) on which a first windward end face (15), a first leeward end face (16) are formed, characterized in that, The balance block body (1) is further provided with an airflow flow channel (2) which is communicated with the first windward end face (15) and the first leeward end face (16), and when the motor rotor rotates corresponding to the rotor balance block, airflow can flow into the airflow flow channel (2) from the first windward end face (15) and flow out of the airflow flow channel (2) from the first leeward end face (16), and the airflow flow channel (2) is formed in the balance block body (1); the balance block body (1) further has a first connecting portion (3) on the side of the first windward end face (15), and the first connecting portion (3) is provided with a first connecting hole (31); the first connecting portion (3) has a second windward end face (32) which is projected on the first inner surface (13), the first windward end face (15) is semicircular with a radius of r2, and the second windward end face (32) is semicircular with a radius of r1; the airflow flow channel (2) is coaxially arranged with the motor rotor; the flow area S2 of the airflow flow channel (2) remains consistent along its extension direction, the balance block body (1) is symmetrical about a radial symmetry plane, the cross-sectional area of the balance block body (1) on the radial symmetry plane is S1, and 0.4*S1≤S2≤0.75*S1; the balance block body (1) further has oppositely arranged first inner surface (13) and first outer surface (14), and a first inner arc surface (11) and a first outer arc surface (12) are respectively connected between the first inner surface (13) and the first outer surface (14), the first connecting portion (3) has a second inner surface (33) coinciding with the first inner surface (13) and a second outer surface (34) arranged in parallel with the second inner surface (33), on the radial cross section of the airflow flow channel (2), the vertical distance between the first outer surface (14) and the flow channel center line is L2, the vertical distance between the second outer surface and the flow channel center line is L1, the vertical distance between the first inner surface (13) and the flow channel center line is L3, the radius of the airflow flow channel (2) is r5, L1=L2, and / or, L2=0.5*L3, and / or, L2=2*r5; and / or, L3=1.5*L1+L2.

2. The rotor balance mass of claim 1, wherein, S2=0.6*S1.

3. The rotor balance block of any one of claims 1 to 2, wherein, The flow area of the airflow flow channel (2) is at least one of circular and elliptical; or the airflow flow channel (2) has multiple airflow flow channels.

4. The rotor balance mass of claim 3, wherein, When the airflow flow channel (2) is one and the flow area is circular, the balance block body (1) has a first inner arc surface (11) which is coaxially arranged with the motor rotor, the radius of the flow channel center line of the airflow flow channel (2) is L4, the balance block body (1) further has a first outer arc surface (12) which is coaxially arranged with the first inner arc surface (11), the radius of the first inner arc surface (11) is r3, the radius of the first outer arc surface (12) is r4, and L4=(r4+r3) / 2.

5. The rotor balance mass of claim 1, wherein, r1=r2。 6. The rotor balance mass of claim 5, wherein, The first windward end face (15) has a first center, the second windward end face (32) has a second center, the first center and the second center are both on the flow passage center line of the airflow passage (2), a first connecting line is formed between the first center and the center of the balance block body (1), a second connecting line is formed between the second center and the center of the balance block body (1), the included angle between the first connecting line and the second connecting line is α, 45°≤α≤75°; and / or, the radius of the first connecting hole (31) is r6, r1=2.25*r6; and / or, the first connecting hole (31) is concentric with the second windward end face (32).

7. The rotor balance mass of claim 1, wherein, The second inner surface and the second outer surface have a second inner circular surface and a second outer circular surface, wherein the second inner circular surface is on the same circular surface as the first inner circular surface (11), the second outer circular surface is on the same circular surface as the first outer circular surface (12), and the free end of the second inner circular surface is connected to the free end of the second outer circular surface through the second windward end face (32).

8. The rotor balance mass of claim 7, wherein, The connecting line between the second outer surface and the second inner circular surface is rounded to form a first rounding structure; and / or, the connecting line between the second outer surface and the second outer circular surface is rounded to form a second rounding structure; and / or, the connecting line between the second outer surface and the second windward end face (32) is rounded to form a third rounding structure.

9. The rotor balance mass of claim 8, wherein, The rounding radii of the first rounding structure, the second rounding structure, and the third rounding structure are the same.

10. The rotor balance mass of claim 8, wherein, The connecting line between the second outer surface and the first windward end face (15) is rounded to form a fourth rounding structure.

11. The rotor balance mass of claim 10, wherein, The rounding radius of the fourth rounding structure is r12, the rounding radius of the first rounding structure is r11, and r11=1.25*r12.

12. The rotor balance mass of claim 11, wherein, The connecting line between the first outer surface (14) and the first inner circular surface (11) is rounded to form a fifth rounding structure; and / or, the connecting line between the first outer surface (14) and the first outer circular surface (12) is rounded to form a sixth rounding structure; and / or, the connecting line between the first outer surface (14) and the first windward end face (15) is rounded to form a seventh rounding structure.

13. The rotor balance mass of claim 12, wherein, The rounding radii of the fifth rounding structure, the sixth rounding structure, and the seventh rounding structure are the same; and / or, the rounding radius of the fifth rounding structure is r13, and r13=r12.

14. The rotor balance mass of claim 1, wherein, The balance block body (1) further has a second connecting portion (4) on the side of the first leeward end face (16), and the second connecting portion (4) is provided with a second connecting hole (41).

15. The rotor balance mass of claim 14, wherein, When the balance block body (1) is symmetrical about a radial symmetry plane, the first connecting portion (3) and the second connecting portion (4) are symmetrical about the radial symmetry plane.

16. The rotor balance mass of claim 15, wherein, The sum of the areas of the first inner surface (13), of a second inner surface of the first connecting portion (3) and of a third inner surface of the second connecting portion (4) is S3, the area of the first outer surface (14) is S4, 0.26*S3≤S4≤0.55*S3.

17. An electric machine rotor, characterized by A rotor balance weight as claimed in any one of claims 1 to 16.

18. An electric machine characterized by An electric machine rotor as claimed in claim 17.

19. A compressor characterized by, An electric machine as claimed in claim 18.

20. An air conditioner characterized by comprising: A compressor as claimed in claim 19.

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