Rotor assembly, motor and compressor

Abstract

The utility model relates to a rotor assembly, a motor and a compressor, the rotor assembly comprises a rotor body, a balance block and a spoiler, the rotor body is provided with an oil return channel along the axial direction in a penetrating manner, and the balance block and the spoiler are both arranged on the end face of the rotor body. The balance block and the spoiler are located on the axial projection between the oil return channel and the outer side wall of the rotor body. The two ends of the spoiler in the circumferential direction and the two ends of the balance block in the circumferential direction are arranged in a spaced mode respectively, and gaps d are formed, wherein d is larger than or equal to 0.5 mm and smaller than or equal to 2.0 mm. According to the rotor assembly, the spoilers are arranged on the rotor body at intervals in cooperation with the balance blocks, splashing of lubricating oil can be reduced, the separation efficiency of the lubricating oil and refrigerant gas is improved, discharge of the lubricating oil is reduced, the backflow efficiency of the lubricating oil is improved, and therefore the overall performance and reliability of a compressor are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a compressor technical field especially is rotor assembly, motor and compressor. BACKGROUND

[0002] The compressor is generally composed of a shell, a motor fixed in the shell and providing rotating power, and a pump body for realizing refrigerant compression. The motor is mainly composed of a stator and a rotor. During the operation of the motor, the unbalanced force and moment generated by the eccentric rotation of the rotor cause the vibration of the compressor to intensify and generate useless work. Therefore, in order to reduce the adverse effects of the unbalanced force, arc-shaped balance blocks are usually added to the upper and lower end faces of the rotor to reduce the unbalanced force.

[0003] The lubricating oil is indispensable for the lubrication of the rotary compressor during high-frequency operation to ensure its reliability and energy efficiency. During the actual operation of the rotary compressor, the lubricating oil is discharged from the spiral oil groove of the crankshaft and mixed with high-pressure refrigerant gas, passes through the gap between the rotor and the stator of the motor, and finally reaches the middle and upper end of the compressor shell. When this oil-gas mixture passes through the exhaust port of the compressor, part of the lubricating oil is taken out of the compressor, resulting in a large amount of lubricating oil being discharged from the compressor and poor backflow effect of the lubricating oil. This phenomenon not only affects the working efficiency of the compressor, but also may cause other components in the system to be severely worn due to lack of sufficient lubricating oil, thereby shortening the service life. SUMMARY

[0004] Therefore, the purpose of the utility model is to overcome the shortcomings of the prior art and provide a rotor assembly, a motor and a compressor. According to the rotor assembly, the motor and the compressor of the utility model embodiment, the disturbance pieces are arranged at intervals on the rotor body in cooperation with the balance blocks, which can reduce the splashing of lubricating oil, improve the separation efficiency of lubricating oil and refrigerant gas, reduce the discharge of lubricating oil and improve the backflow efficiency of lubricating oil, thereby improving the overall performance and reliability of the compressor.

[0005] In order to achieve the above-mentioned purpose, the first aspect of the utility model embodiment provides a rotor assembly, which comprises a rotor body, a balance block and a disturbance piece. The rotor body is provided with an oil return channel along its axial direction. The balance block and the disturbance piece are arranged on the end face of the rotor body, and the balance block and the disturbance piece are located on the axial projection between the oil return channel and the outer side wall of the rotor body. The two ends of the disturbance piece in the circumferential direction are respectively arranged at intervals with the two ends of the balance block in the circumferential direction and form a gap d, 0.5mm≤d≤2.0mm.

[0006] Thus, according to the rotor assembly of the embodiment of the utility model, the eccentric moment caused by the imbalance of the rotor body is compensated by arranging the balance block on the end face of the rotor body, and the turbulence member is arranged at intervals with the balance block, the gap formed between the turbulence member and the balance block enables the turbulence member to reduce the splashing of lubricating oil and effectively improve the separation efficiency of lubricating oil and refrigerant gas, thereby reducing the discharge of lubricating oil and improving the backflow efficiency of lubricating oil, and improving the performance and reliability of the compressor.

[0007] As an implementation form, the balance block is in a circular arc structure, the turbulence member is in a circular arc structure, and the turbulence member extends out a baffle part at both ends in the circumferential direction thereof in the axial direction away from the rotor body, and the baffle part is arranged at intervals with the balance block and forms the gap d.

[0008] As an implementation form, the projection of the baffle part in the circumferential direction of the balance block covers the end face of the balance block in the circumferential direction.

[0009] As an implementation form, an oil blocking cover is further arranged on the end face of the rotor body, and the oil blocking cover covers the balance block and the turbulence member, the oil blocking cover is provided with a relief hole in the axial direction, and the projection of the relief hole in the axial direction covers the oil return channel. Thus, according to the rotor assembly of the embodiment of the utility model, the oil blocking cover is arranged on the balance block and the turbulence member, and the oil blocking effect of the oil blocking cover in the circumferential direction of the balance block and the turbulence member can reduce the degree of cutting of large oil particles by the balance block and the turbulence member, so that the large oil particles can quickly drop back to the bottom of the compressor by gravity, effectively improve the oil circulation in the compressor, and reduce the pulsation noise.

[0010] As an implementation form, the oil blocking cover is in a tubular structure with one end open, the open end of the oil blocking cover abuts against the end face of the rotor body, and the end of the oil blocking cover away from the open end is provided with the relief hole.

[0011] As an implementation form, the end of the oil blocking cover away from the open end is fixed to the balance block.

[0012] As an implementation form, the turbulence member is provided with a first rivet hole in the axial direction thereof, and the first rivet hole is used for rivet penetration to fix the turbulence member to the rotor body.

[0013] As an implementation form, the balance block is provided with a second rivet hole in the axial direction thereof, and the second rivet hole is used for rivet penetration to fix the balance block to the rotor body.

[0014] The utility model discloses an embodiment second aspect provides a kind of motor, it includes the rotor assembly of any described above. According to the motor of the utility model embodiment, by arranging spoiler at interval with balance block on rotor body, it can reduce the splash of lubricating oil, and improve the separation efficiency of lubricating oil and refrigerant gas, reduce the discharge of lubricating oil and improve the reflux efficiency of lubricating oil, to improve the overall performance and reliability of compressor.

[0015] The utility model discloses an embodiment third aspect provides a kind of compressor, it includes the motor of any described above. According to the compressor of the utility model embodiment, by arranging spoiler at interval with balance block on rotor body, it can reduce the splash of lubricating oil, and improve the separation efficiency of lubricating oil and refrigerant gas, reduce the discharge of lubricating oil and improve the reflux efficiency of lubricating oil, to improve the overall performance and reliability of compressor.

[0016] For better understanding and implementation, the utility model is explained in detail below in conjunction with the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is the structure schematic view of the rotor assembly of the utility model embodiment;

[0018] Figure 2 It is the structure schematic view of the rotor assembly of the utility model embodiment;

[0019] Figure 3 It is the structure schematic view of the rotor assembly of the utility model embodiment;

[0020] Figure 4 It is the structure schematic view of the rotor assembly of the utility model embodiment;

[0021] Figure 5 It is the structure schematic view of the rotor assembly of the utility model embodiment;

[0022] Figure 6 It is the structure schematic view of the rotor assembly of the utility model embodiment;

[0023] Figure 7 It is the structure schematic view of the rotor assembly of the utility model embodiment.

[0024] BRIEF DESCRIPTION OF DRAWINGS

[0025] 10, rotor body;11, oil return channel;20, balance block;21, second rivet hole;30, spoiler;31, baffle part;32, first rivet hole;40, oil baffle cover;41, avoiding hole;42, third rivet hole. DETAILED DESCRIPTION

[0026] To further illustrate the embodiments, the utility model provides has the drawing. These drawings are part of the utility model disclosure, which is mainly used to illustrate the embodiments, and can be combined with the related description of the specification to explain the operation principle of the embodiments. With reference to these contents, those skilled in the art should understand other possible implementations and the advantages of the utility model.

[0027] In the related art, the lubricating oil is indispensable for the lubrication of the rotary compressor during high-frequency operation to ensure its reliability and energy efficiency. During actual operation of the rotary compressor, the lubricating oil is discharged from the spiral oil groove of the crankshaft and mixed with high-pressure refrigerant gas, passes through the gap between the rotor and the stator of the motor, and finally reaches the middle and upper end of the compressor housing. When this oil-gas mixture passes through the exhaust port of the compressor, part of the lubricating oil is carried out of the compressor, resulting in excessive discharge of lubricating oil from the compressor and poor backflow effect of the lubricating oil. This phenomenon not only affects the working efficiency of the compressor, but also can cause other components in the system to wear out due to lack of sufficient lubricating oil, thereby shortening the service life.

[0028] Therefore, the utility model embodiment provides a rotor assembly, a motor and a compressor. According to the rotor assembly, the motor and the compressor of the utility model embodiment, the disturbance piece 30 is arranged on the rotor body 10 in cooperation with the balance block 20 to reduce the splashing of the lubricating oil, improve the separation efficiency of the lubricating oil and the refrigerant gas, reduce the discharge of the lubricating oil and improve the backflow efficiency of the lubricating oil, thereby improving the overall performance and reliability of the compressor.

[0029] Please refer to Figures 1 to 7 The utility model embodiment provides a rotor assembly, a motor and a compressor. According to the rotor assembly, the motor and the compressor of the utility model embodiment, the disturbance piece 30 is arranged on the rotor body 10 in cooperation with the balance block 20 to reduce the splashing of the lubricating oil, improve the separation efficiency of the lubricating oil and the refrigerant gas, reduce the discharge of the lubricating oil and improve the backflow efficiency of the lubricating oil, thereby improving the overall performance and reliability of the compressor.

[0030] Therefore, the utility model embodiment provides a rotor assembly, a motor and a compressor. According to the rotor assembly, the motor and the compressor of the utility model embodiment, the disturbance piece 30 is arranged on the rotor body 10 in cooperation with the balance block 20 to reduce the splashing of the lubricating oil, improve the separation efficiency of the lubricating oil and the refrigerant gas, reduce the discharge of the lubricating oil and improve the backflow efficiency of the lubricating oil, thereby improving the overall performance and reliability of the compressor.

[0031] In this embodiment of the invention, the balance block 20 has an arc-shaped structure, and the turbulence member 30 has an arc-shaped structure. At both ends of the turbulence member 30, baffle portions 31 extend axially away from the rotor body 10. The baffle portions 31 are spaced apart from the balance block 20, forming a gap d. Furthermore, the projection of the baffle portions 31 onto the circumferential direction of the balance block 20 covers the circumferential end face of the balance block 20.

[0032] In this embodiment of the invention, the turbulence-disrupting component 30, through baffle portions 31 extending from both ends of its circumferential direction, is spaced apart from the two ends of the balance block 20 along the circumferential direction. The baffle portions 31 shield the balance block 20. During the rotation of the rotor body 10, the turbulence-disrupting component 30 can turbulentize the oil-gas mixture, thereby improving the separation efficiency between the lubricating oil and the refrigerant gas, and reducing lubricating oil splashing. This helps reduce lubricating oil discharge from the compressor and improves the lubricating oil return efficiency. It is worth noting that the turbulence-disrupting component 30 in this embodiment adopts a flat structural design so that its own weight does not interfere with the balance block 20, preventing insufficient eccentric torque caused by the balance block 20 supplementing the imbalance of the rotor body 10 due to excessive weight of the turbulence-disrupting component 30.

[0033] Optionally, in some embodiments of this utility model, the rotor assembly further includes an oil baffle 40, which is disposed on the end face of the rotor body 10 and covers the balance block 20 and the baffle member 30. The oil baffle 40 has a clearance hole 41 extending through it in the axial direction, and the projection of the clearance hole 41 in the axial direction covers the oil return channel 11. It can be understood that, according to the rotor assembly of these embodiments, by covering the balance block 20 and the baffle member 30 with the oil baffle 40, the oil baffle 40 can reduce the degree to which large oil particles are cut by the balance block 20 and the baffle member 30 by the oil baffle 40 in the circumferential direction of the balance block 20 and the baffle member 30, so that more large oil particles can fall back to the bottom of the compressor more quickly by their own gravity, effectively improving the oil circulation inside the compressor and reducing pulsating noise.

[0034] Furthermore, in these embodiments, the oil baffle 40 is a cylindrical structure with one open end. The open end of the oil baffle 40 abuts against the end face of the rotor body 10, and the end of the oil baffle 40 away from its opening is provided with a clearance hole 41. In addition, the end of the oil baffle 40 away from its opening is abutted and fixed to the balance block 20.

[0035] Optionally, in some embodiments of the utility model, the spoiler 30 is provided with a first rivet hole 32 along its axial direction, and the first rivet hole 32 is used for rivet penetration to fix the spoiler 30 on the rotor body 10. That is, in these embodiments, the spoiler 30 is arranged on the end face of the rotor body 10 by rivets, so that the connection between the spoiler 30 and the rotor body 10 is firm and reliable, and the two are not easy to separate.

[0036] Optionally, in some embodiments of the utility model, the balance block 20 is provided with a second rivet hole 21 along its axial direction, and the second rivet hole 21 is used for rivet penetration to fix the balance block 20 on the rotor body 10. In these embodiments, the balance block 20 is arranged on the end face of the rotor body 10 by rivets, so that the connection between the balance block 20 and the rotor body 10 is firm and reliable, and the two are not easy to separate.

[0037] The following describes a specific embodiment of the rotor assembly according to the utility model in detail. Figures 1 to 4 It is worth understanding that the following embodiments are only illustrative and cannot be understood as a limitation of the utility model.

[0038] The embodiment provides a rotor assembly, which comprises a rotor body 10, a balance block 20 and a spoiler 30, the rotor body 10 is provided with an oil return channel 11 along its axial direction, the balance block 20 and the spoiler 30 are arranged on the end face of the rotor body 10, and the balance block 20 and the spoiler 30 are located on the axial projection between the oil return channel 11 and the outer side wall of the rotor body 10; the two ends of the spoiler 30 in the circumferential direction are arranged in a spaced manner with the two ends of the balance block 20 in the circumferential direction and form a gap d, and d=1.25mm.

[0039] Specifically, in the embodiment, the balance block 20 is in a circular arc structure, the spoiler 30 is in a circular arc structure, the spoiler 30 extends out a baffle part 31 in the axial direction away from the rotor body 10 at its two ends in the circumferential direction, the baffle part 31 is arranged in a spaced manner with the balance block 20 and forms a gap d, and the projection of the baffle part 31 in the circumferential direction of the balance block 20 covers the end face of the balance block 20 in the circumferential direction.

[0040] In addition, in the embodiment, the spoiler 30 is provided with a first rivet hole 32 along its axial direction, and the first rivet hole 32 is used for rivet penetration to fix the spoiler 30 on the rotor body 10. Correspondingly, the balance block 20 is provided with a second rivet hole 21 along its axial direction, and the second rivet hole 21 is used for rivet penetration to fix the balance block 20 on the rotor body 10.

[0041] The following describes a specific embodiment of the rotor assembly according to the utility model in detail. Figures 1 to 4The detailed description is made to one specific embodiment of the rotor assembly according to the utility model, and it is worth understanding that the following embodiment is only illustrative and cannot be understood as the limitation of the utility model.

[0042] The embodiment provides a rotor assembly, which comprises a rotor body 10, a balance block 20 and a spoiler 30, the rotor body 10 is provided with an oil return channel 11 along the axial direction of the rotor body 10, the balance block 20 and the spoiler 30 are arranged on the end face of the rotor body 10, and the balance block 20 and the spoiler 30 are located on the axial projection between the oil return channel 11 and the outer side wall of the rotor body 10; the two ends of the spoiler 30 in the circumferential direction are respectively arranged in a spaced manner with the two ends of the balance block 20 in the circumferential direction and form a gap d, and d=0.5mm.

[0043] Specifically, in the embodiment, the balance block 20 is in a circular arc structure, the spoiler 30 is in a circular arc structure, the spoiler 30 extends out a baffle part 31 in the axial direction away from the rotor body 10 at the two ends in the circumferential direction of the spoiler 30, the baffle part 31 is arranged in a spaced manner with the balance block 20 and forms the gap d, and the projection of the baffle part 31 in the circumferential direction of the balance block 20 covers the end face of the balance block 20 in the circumferential direction.

[0044] In addition, in the embodiment, the spoiler 30 is provided with a first rivet hole 32 along the axial direction of the spoiler 30, the first rivet hole 32 is used for rivet penetration so that the spoiler 30 is fixed on the rotor body 10. Correspondingly, the balance block 20 is provided with a second rivet hole 21 along the axial direction of the balance block 20, the second rivet hole 21 is used for rivet penetration so that the balance block 20 is fixed on the rotor body 10.

[0045] The following will be described in detail Figures 1 to 4 The detailed description is made to one specific embodiment of the rotor assembly according to the utility model, and it is worth understanding that the following embodiment is only illustrative and cannot be understood as the limitation of the utility model.

[0046] The embodiment provides a rotor assembly, which comprises a rotor body 10, a balance block 20 and a spoiler 30, the rotor body 10 is provided with an oil return channel 11 along the axial direction of the rotor body 10, the balance block 20 and the spoiler 30 are arranged on the end face of the rotor body 10, and the balance block 20 and the spoiler 30 are located on the axial projection between the oil return channel 11 and the outer side wall of the rotor body 10; the two ends of the spoiler 30 in the circumferential direction are respectively arranged in a spaced manner with the two ends of the balance block 20 in the circumferential direction and form a gap d, and d=2.0mm.

[0047] Specifically, in the embodiment, the balance block 20 is a circular arc structure, the spoiler 30 is a circular arc structure, the spoiler 30 extends out the baffle part 31 in the direction away from the rotor body 10 along the axial direction at both ends of the circumferential direction, the baffle part 31 and the balance block 20 are spaced apart and form a gap d, and the projection of the baffle part 31 on the circumferential direction of the balance block 20 covers the end surface of the balance block 20 in the circumferential direction.

[0048] In addition, in the embodiment, the spoiler 30 is provided with a first rivet hole 32 penetrating through in the axial direction, and the first rivet hole 32 is used for rivet penetration to fix the spoiler 30 on the rotor body 10. Correspondingly, the balance block 20 is provided with a second rivet hole 21 penetrating through in the axial direction, and the second rivet hole 21 is used for rivet penetration to fix the balance block 20 on the rotor body 10.

[0049] The specific embodiments of the rotor assembly according to the utility model will be described in detail below, and it should be understood that the following embodiments are only exemplary and cannot be understood as a limitation of the utility model. Figures 5 to 7 The specific embodiments of the rotor assembly according to the utility model will be described in detail below, and it should be understood that the following embodiments are only exemplary and cannot be understood as a limitation of the utility model.

[0050] The embodiment provides a rotor assembly, which comprises a rotor body 10, a balance block 20, a spoiler 30 and an oil baffle 40, the rotor body 10 is provided with an oil return channel 11 penetrating through in the axial direction, the balance block 20 and the spoiler 30 are arranged on the end surface of the rotor body 10, and the balance block 20 and the spoiler 30 are located on the axial projection between the oil return channel 11 and the outer side wall of the rotor body 10; the spoiler 30 is spaced apart from the balance block 20 at both ends in the circumferential direction and forms a gap d, d=0.5mm; the oil baffle 40 is arranged on the end surface of the rotor body 10, and the oil baffle 40 covers the balance block 20 and the spoiler 30, the oil baffle 40 is provided with an avoiding hole 41 penetrating through in the axial direction, and the projection of the avoiding hole 41 in the axial direction covers the oil return channel 11.

[0051] Specifically, in the embodiment, the balance block 20 is a circular arc structure, the spoiler 30 is a circular arc structure, the spoiler 30 extends out the baffle part 31 in the direction away from the rotor body 10 along the axial direction at both ends of the circumferential direction, the baffle part 31 and the balance block 20 are spaced apart and form a gap d, and the projection of the baffle part 31 on the circumferential direction of the balance block 20 covers the end surface of the balance block 20 in the circumferential direction.

[0052] Further, the oil baffle 40 of the embodiment is a cylindrical structure with one open end, the open end of the oil baffle 40 abuts on the end surface of the rotor body 10, the end away from the open end of the oil baffle 40 is provided with the avoiding hole 41, and the end away from the open end of the oil baffle 40 is fixed on the balance block 20.

[0053] Further, in the present embodiment, the spoiler 30 is provided with a first rivet hole 32 penetrating through the axial direction of the spoiler 30, and the first rivet hole 32 is used for rivet penetration so as to fix the spoiler 30 on the rotor body 10. Correspondingly, the balance block 20 is provided with a second rivet hole 21 penetrating through the axial direction of the balance block 20, and the second rivet hole 21 is used for rivet penetration so as to fix the balance block 20 on the rotor body 10, and correspondingly, the oil baffle cover 40 is provided with a third rivet hole 42 coaxially arranged with the second rivet hole 21, so that the oil baffle cover 40 is abutted and fixed on the balance block 20 and the balance block 20 is abutted and fixed on the rotor body 10 after the rivet sequentially penetrates through the third rivet hole 42 and the second rivet hole 21.

[0054] The utility model embodiment second aspect provides a kind of motor, it includes any one of above rotor assembly. According to the motor of the utility model embodiment, by cooperating balance block 20 and arranging spoiler 30 at interval on rotor body 10, the splash of lubricating oil can be reduced, and the separation efficiency of lubricating oil and refrigerant gas is improved, the discharge of lubricating oil is reduced and the reflux efficiency of lubricating oil is improved, so that the overall performance and reliability of compressor are improved.

[0055] The utility model embodiment third aspect provides a kind of compressor, it includes any one of above motor. According to the compressor of the utility model embodiment, by cooperating balance block 20 and arranging spoiler 30 at interval on rotor body 10, the splash of lubricating oil can be reduced, and the separation efficiency of lubricating oil and refrigerant gas is improved, the discharge of lubricating oil is reduced and the reflux efficiency of lubricating oil is improved, so that the overall performance and reliability of compressor are improved.

[0056] In the description of the utility model, it needs to be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "left", "right", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as limiting the device or element indicated to have a particular orientation, to be constructed and operated in a particular orientation, so it cannot be understood as limiting the utility model.

[0057] The above embodiments only express several implementation manners of the utility model, and the description is more specific and detailed, but it cannot be understood as limiting the scope of the utility model rotor assembly, motor and compressor. It should be pointed out that, for ordinary skilled person in the art, without departing from the concept of the utility model, a plurality of deformations and improvements can be made, which all belong to the protection scope of the utility model.

Claims

1.A rotor assembly, characterized in that: comprising a rotor body, a balance block and a spoiler, the rotor body is provided with an oil return channel through the rotor body along the axial direction, the balance block and the spoiler are arranged on the end face of the rotor body, and the balance block and the spoiler are located on the axial projection between the oil return channel and the outer wall of the rotor body; the two ends of the spoiler in the circumferential direction are respectively spaced apart from the two ends of the balance block in the circumferential direction and form a gap d, 0.5mm≤d≤2.0mm. 2.The rotor assembly according to claim 1, characterized in that: the balance block is a circular arc structure, the spoiler is a circular arc structure, the spoiler extends out a baffle part in the axial direction away from the rotor body at the two ends of the spoiler in the circumferential direction, and the baffle part is spaced apart from the balance block and forms the gap d. 3.The rotor assembly according to claim 2, characterized in that: the projection of the baffle part in the circumferential direction of the balance block covers the end face of the balance block in the circumferential direction. 4.The rotor assembly according to claim 1, characterized in that: further comprising an oil baffle cover, the oil baffle cover is arranged on the end face of the rotor body, and the oil baffle cover covers the balance block and the spoiler, the oil baffle cover is provided with a relief hole through the oil baffle cover along the axial direction, and the projection of the relief hole in the axial direction covers the oil return channel. 5.The rotor assembly according to claim 4, characterized in that: the oil baffle cover is a cylindrical structure with one open end, the open end of the oil baffle cover abuts against the end face of the rotor body, and the end of the oil baffle cover away from the open end is provided with the relief hole. 6.The rotor assembly according to claim 5, characterized in that: the end of the oil baffle cover away from the open end abuts and is fixed on the balance block. 7.The rotor assembly according to claim 1, characterized in that: the spoiler is provided with a first rivet hole through the spoiler along the axial direction, and the first rivet hole is used for rivet penetration to fix the spoiler on the rotor body. 8.The rotor assembly according to claim 1, characterized in that: the balance block is provided with a second rivet hole through the balance block along the axial direction, and the second rivet hole is used for rivet penetration to fix the balance block on the rotor body. 9.An electric machine, characterized in that: comprising the rotor assembly according to any one of claims 1 to 8. 10.A compressor, characterized in that: comprising the electric machine according to claim 9. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

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