Rotor assembly, compressor and electrical appliance having the same

Abstract

The present application provides a rotor assembly and a compressor and an electrical appliance having the same. The rotor assembly includes a crankshaft; the crankshaft includes a main shaft portion, an eccentric portion and a rotor core; the eccentric portion is connected to the main shaft portion; the rotor core is arranged on the main shaft portion, and the rotor assembly also includes: a main balancing block, a first secondary balancing block and a second secondary balancing block, the main balancing block is located at the first end of the rotor core; the first secondary balancing block is located at the second end of the rotor core; the second secondary balancing block is located at the second end of the rotor core; according to the rotor assembly and the compressor and the electrical appliance having the same of the present application, two secondary balancing blocks are used, so that the mass of the main balancing block can be effectively reduced, thereby reducing the height of the main balancing block.

Description

Technical Field

[0001] The present application belongs to the technical field of compressors, and in particular relates to a rotor assembly and a compressor and an electrical appliance having the same. Background Art

[0002] At present, the refrigeration compressors used in household air conditioners are mainly rolling rotor compressors. This type of compressor uses a crankshaft with an eccentric structure. Rollers are mounted on the eccentric part of the crankshaft. The rollers rotate with the crankshaft under the drive of the motor to compress the refrigerant gas. However, the axis of the eccentric part of the crankshaft is not concentric with the axis of the motor rotor. It is necessary to balance the inertia force and torque caused by the eccentricity of the eccentric part of the crankshaft during rotation.

[0003] However, the existing balancing system consists of a main balancing block located at the bottom of the motor rotor and a secondary balancing block located at the top of the motor rotor. The main balancing block of this balancing structure design is relatively high. On the one hand, if the main balancing block is too high, the disturbance of the flow field in the lower cavity of the motor will be aggravated, thereby increasing the pressure pulsation in the lower cavity of the motor and affecting the noise level. On the other hand, if the main balancing block is too high, the windward area will be increased, and the exhaust impact will be strengthened, thereby causing the oil droplets flowing with the exhaust to be further broken into small droplets. The small droplets are more likely to enter the upper cavity of the motor, resulting in an increase in the oil discharge rate of the compressor.

[0004] Therefore, how to provide a rotor assembly that can reduce the height of the main balancing block and a compressor and an electrical appliance having the same has become a problem that those skilled in the art urgently need to solve. Summary of the invention

[0005] Therefore, the technical problem to be solved by the present application is to provide a rotor assembly and a compressor and an electrical appliance having the same, which can reduce the height of the main balancing block.

[0006] In order to solve the above problems, the present application provides a rotor assembly, the rotor assembly includes a crankshaft; the crankshaft includes a main shaft portion, an eccentric portion and a rotor core; the eccentric portion is connected to the main shaft portion; the rotor core is arranged on the main shaft portion, and the rotor assembly also includes:

[0007] A main balancing block, the main balancing block is located at a first end of the rotor core;

[0008] A first auxiliary balancing mass, the first auxiliary balancing mass is located at the second end of the rotor core;

[0009] and a second balancing mass, wherein the second balancing mass is located at the second end of the rotor core.

[0010] Preferably, the mass of the first auxiliary balancing mass is m2; the mass of the second auxiliary balancing mass is m3; wherein m2>m3.

[0011] Preferably, the positions of the first auxiliary balancing mass, the second auxiliary balancing mass and the eccentric portion in the axial direction of the crankshaft correspond to each other.

[0012] Preferably, the distance between the first auxiliary balancing block and the rotor core in the axial direction of the crankshaft is b; the distance between the second auxiliary balancing block and the rotor core in the axial direction of the crankshaft is c; wherein c>b.

[0013] Preferably, the first auxiliary balancing mass corresponds to the eccentric portion in the axial direction of the crankshaft; the eccentric portion and the second auxiliary balancing mass are respectively located on opposite sides of one diameter on the cross section of the crankshaft.

[0014] Preferably, the rotor assembly further comprises: a first magnetic blocking portion, the first magnetic blocking portion being mounted on a first end portion of the rotor core;

[0015] And / or, the rotor assembly further comprises a second magnetic shielding portion, and the second magnetic shielding portion is mounted on the second end portion of the rotor core;

[0016] And / or, the rotor core is provided with axial core flow holes.

[0017] Preferably, the rotor assembly further comprises a sealing portion; the sealing portion and the second magnetic blocking portion are arranged in sequence in a direction away from the rotor core.

[0018] Preferably, the rotor assembly further comprises a liquid blocking component; the sealing portion, the second magnetic blocking portion and the liquid blocking component are arranged in sequence in a direction away from the rotor core.

[0019] Preferably, the first auxiliary balancing weight is mounted on the second magnetic blocking portion; and / or the second auxiliary balancing weight is mounted on the sealing portion.

[0020] Preferably, the first auxiliary balancing weight is installed on the sealing portion; and / or the second auxiliary balancing weight is installed on the liquid blocking component.

[0021] Preferably, the first auxiliary balancing mass and the second magnetic blocking portion are an integral structure; and / or the second auxiliary balancing mass and the sealing portion are an integral structure.

[0022] Preferably, the second magnetic shielding portion is provided with a magnetic flux blocking hole corresponding to the iron core flux hole;

[0023] And / or, a first boss is arranged on a surface of the second magnetic blocking portion away from the rotor core;

[0024] And / or, a second boss is provided on a surface of the sealing portion away from the rotor core;

[0025] And / or, a first mounting surface is provided on a surface of the second magnetic blocking portion away from the rotor core, and the first auxiliary balancing block is mounted on the first mounting surface;

[0026] And / or, a second mounting surface is provided on a surface of the sealing portion away from the rotor core, and the second auxiliary balancing block is mounted on the second mounting surface;

[0027] And / or, a mounting hole is provided on the second magnetism blocking part, the second magnetism blocking part is mounted on the main shaft part through the mounting hole, and a sealing ring is provided on the second magnetism blocking part, and the position and size of the sealing ring correspond to those of the mounting hole.

[0028] According to another aspect of the present application, a compressor is provided, including a rotor assembly, which is the above-mentioned rotor assembly.

[0029] According to another aspect of the present application, an electrical appliance is provided, comprising a compressor, which is the above-mentioned compressor.

[0030] The rotor assembly provided in the present application, as well as the compressor and electrical appliance having the same, adopt two auxiliary balancing blocks, so that the mass of the main balancing block can be effectively reduced, thereby reducing the height of the main balancing block; it can solve the problem that the main balancing block is too high, which aggravates the disturbance of the flow field in the lower cavity of the motor, thereby increasing the pressure pulsation in the lower cavity of the motor and affecting the noise level; at the same time, it solves the technical problem that the main balancing block is too high, resulting in an increase in the windward area and an increase in the exhaust gas impact, thereby causing the oil droplets flowing with the exhaust gas to be further broken into small droplets, and the small droplets are more likely to enter the upper cavity of the motor, resulting in an increase in the oil discharge rate of the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic diagram of the installation structure of the rotor assembly of an embodiment of the present application;

[0032] Figure 2 is a cross-sectional view of a rotor assembly according to an embodiment of the present application;

[0033] Figure 3 A top view of the second magnetic blocking portion of an embodiment of the present application;

[0034] Figure 4 This is a schematic structural diagram of the second magnetic shielding part of an embodiment of the present application;

[0035] Figure 5 This is a schematic structural diagram of a sealing portion according to an embodiment of the present application;

[0036] Figure 6 A top view of a sealing portion according to an embodiment of the present application;

[0037] Figure 7 It is a structural force diagram of a rotor assembly in the prior art;

[0038] Figure 8 A structural force diagram of a rotor assembly according to an embodiment of the present application;

[0039] Fig. 9 is a cross-sectional view of a rotor assembly according to an embodiment of the present application;

[0040] Fig.10 A structural force diagram of a rotor assembly according to an embodiment of the present application;

[0041] Fig.11 is a cross-sectional view of a rotor assembly according to an embodiment of the present application;

[0042] Fig.12 It is a cross-sectional view of a rotor assembly according to an embodiment of the present application.

[0043] The reference numerals are:

[0044] 1. Main shaft portion; 2. Eccentric portion; 3. Main balancing block; 4. Rotor core; 5. First sub-balancing block; 6. Second sub-balancing block; 7. First magnetic blocking portion; 8. Sealing ring; 9. Second magnetic blocking portion; 10. Sealing portion; 11. First mounting surface; 12. Magnetic flow blocking hole; 13. Second mounting surface; 14. Liquid blocking component; 15. Core flow hole; 16. First boss; 17. Second boss. DETAILED DESCRIPTION

[0045] See also Figure 1 As shown, according to an embodiment of the present application, a rotor assembly includes a crankshaft; the crankshaft includes a main shaft portion 1, an eccentric portion 2 and a rotor core 4; the eccentric portion 2 is connected to the main shaft portion 1; the rotor core 4 is arranged on the main shaft portion 1, and the rotor assembly also includes: a main balancing block 3, a first auxiliary balancing block 5 and a second auxiliary balancing block 6, the main balancing block 3 is located at the first end of the rotor core 4; the first auxiliary balancing block 5 is located at the second end of the rotor core 4; the second auxiliary balancing block 6 is located at the second end of the rotor core 4, and two auxiliary balancing blocks are used, so that the mass of the main balancing block 3 can be effectively reduced, thereby reducing the height of the main balancing block 3; it can solve the problem that the main balancing block 3 is too high, which aggravates the disturbance of the flow field in the lower cavity of the motor, thereby increasing the pressure pulsation in the lower cavity of the motor and affecting the noise level; at the same time, it solves the problem that the main balancing block 3 is too high, resulting in an increase in the windward area, and the exhaust slapping effect is strengthened, thereby causing the oil droplets flowing with the exhaust to be further broken into small droplets, and the small droplets are more likely to enter the upper cavity of the motor, resulting in an increase in the oil discharge rate of the compressor.

[0046] Furthermore, the mass of the first auxiliary balancing mass 5 is m2; the mass of the second auxiliary balancing mass 6 is m3; wherein, m2>m3.

[0047] See also Figure 2 As shown, the present application also discloses some embodiments, in which the positions of the first auxiliary balancing mass 5 , the second auxiliary balancing mass 6 and the eccentric portion 2 in the axial direction of the crankshaft correspond to each other.

[0048] Furthermore, the distance between the first auxiliary balancing mass 5 and the rotor core 4 in the axial direction of the crankshaft is b; the distance between the second auxiliary balancing mass 6 and the rotor core 4 in the axial direction of the crankshaft is c; wherein c>b.

[0049] See also Fig. 9As shown, the present application also discloses some embodiments, the first auxiliary balancing mass 5 corresponds to the position of the eccentric portion 2 in the axial direction of the crankshaft; the eccentric portion 2 and the second auxiliary balancing mass 6 are respectively located on opposite sides of one diameter on the cross section of the crankshaft.

[0050] The rotor assembly also includes a plurality of magnetic steels, and the entire rotor assembly is fastened by riveting or screwing.

[0051] like Figure 2 As shown, the second magnetic blocking part 9, the first auxiliary balancing block 5, the sealing part 10, the second auxiliary balancing block 6, and the liquid blocking part 14 are installed in sequence on the upper part of the rotor core 4; the first auxiliary balancing block 5 is located on the first auxiliary balancing block 5 mounting surface of the second magnetic blocking part 9, the second auxiliary balancing block 6 is located on the second auxiliary balancing block 6 mounting surface of the sealing part 10, and the first auxiliary balancing block 5 and the second auxiliary balancing block 6 are arranged on the same side.

[0052] The balanced structure of this scheme is subjected to stress as follows Figure 8 As shown, the rotational inertia force and moment satisfy the following relationship:

[0053] F1=F0+F2+F3 (1)

[0054] F0·a=F2·b+F3·c (2)

[0055] F0=m0·r0·ω 2 (3)

[0056] F1=m1·r1·ω 2 (4)

[0057] F2=m2·r2·ω 2 (5)

[0058] F3=m3·r3·ω 2 (6)

[0059] m3=ηm2 (7)

[0060] In the formula, m0 represents the eccentric mass, m1 represents the mass of the main balancing block, m2 represents the mass of the first sub-balancing block, m3 represents the mass of the second sub-balancing block, r0 represents the distance between the center of mass of the eccentric mass and the center of the crankshaft, r1 represents the distance between the center of mass of the main balancing block and the center of mass of the crankshaft, r2 represents the distance between the center of mass of the first sub-balancing block and the center of mass of the crankshaft, r3 represents the distance between the center of mass of the second sub-balancing block and the center of mass of the crankshaft, a represents the axial distance between the center of mass of the main balancing block and the center of mass of the eccentric mass, b represents the axial distance between the center of mass of the main balancing block one and the center of mass of the sub-balancing block, c represents the axial distance between the center of mass of the main balancing block two and the center of mass of the sub-balancing block, ω represents the compressor speed, and η is a coefficient less than 1.

[0061] Let r2=r3, and according to formula 1-7, we can get:

[0062]

[0063] The single-cylinder rotor compressor balance structure in the prior art is subjected to stress as follows Figure 7 As shown, the mass of its main balancing block m1' satisfies the following relationship:

[0064]

[0065] Since c>b, then m1<m1, the main balance block 3 of the patent solution has a smaller mass, and the corresponding main balance block 3 can be made smaller in height, and the windward area of ​​the main balance block 3 is smaller, which weakens the exhaust impact on the pump body, reduces the number of small oil droplets, and further reduces the possibility of refrigeration oil entering the upper chamber of the motor, and finally reduces the oil discharge rate of the compressor;

[0066] The adoption of the scheme of the present invention can reduce the mass of the main balancing block 3, thereby reducing the height of the main balancing block 3, and further reducing the main. On the other hand, it can reduce the pressure pulsation in the lower chamber of the motor and improve the sound quality of the entire compressor.

[0067] like Fig. 9 As shown, the second magnetic blocking part 9, the first sub-balancing block 5, the sealing part 10, the second sub-balancing block 6, and the liquid blocking part 14 are installed in sequence on the upper part of the rotor core 4. The first sub-balancing block 5 is located on the first sub-balancing block 5 mounting surface of the second magnetic blocking part 9, the second sub-balancing block 6 is located on the second sub-balancing block 6 mounting surface of the sealing part 10, and the first sub-balancing block 5 and the second sub-balancing block 6 are arranged on opposite sides.

[0068] The balanced structure of this scheme is subjected to stress as follows Fig.10 As shown, the rotational inertia force and moment satisfy the following relationship:

[0069] F1+F3=F0+F2 (10)

[0070] F0·a+F3·c=F2·b (11)

[0071] According to formulas 3-7, 10 and 11, we can obtain:

[0072]

[0073] Since c>b, η<1, then m1<m1′, the main balance block 3 of the patent solution has a smaller mass, and the corresponding main balance block 3 can be made smaller in height, and the main balance block 3 has a smaller windward area, which weakens the exhaust impact on the pump body, reduces the number of small oil droplets, and thus reduces the possibility of refrigeration oil entering the upper chamber of the motor, and finally reduces the oil discharge rate of the compressor. At the same time, since the second sub-balance block 6 is arranged on both sides of the first sub-balance block 5, during the rotation of the crankshaft rotor assembly, the second sub-balance block 6 will balance the torque of the first sub-balance block 5 relative to the main balance block 3, thereby reducing the deflection of the crankshaft rotor assembly.

[0074] like Fig.11 As shown, the second magnetic blocking part 9, the sealing part 10, the first sub-balancing block 5, the liquid blocking component 14, and the second sub-balancing block 6 are installed in sequence on the upper part of the rotor core 4. The first sub-balancing block 5 is located on the sealing part 10, and the second sub-balancing block 6 is located on the liquid blocking component 14. The first sub-balancing block 5 and the second sub-balancing block 6 are arranged on the same side.

[0075] like Fig.12 As shown, the second magnetic blocking part 9, the sealing part 10, the first sub-balancing block 5, the liquid blocking component 14, and the second sub-balancing block 6 are installed in sequence on the upper part of the rotor core 4. The first sub-balancing block 5 is located on the sealing part 10, and the second sub-balancing block 6 is located on the liquid blocking component 14. The first sub-balancing block 5 and the second sub-balancing block 6 are arranged on both sides.

[0076] Furthermore, the rotor assembly further includes: a first magnetic blocking portion 7, which is mounted on a first end portion of the rotor core 4;

[0077] And / or, the rotor assembly further includes a second magnetic shielding portion 9, which is mounted on a second end portion of the rotor core 4;

[0078] And / or, the rotor core 4 is provided with axial core flow holes 15 .

[0079] Furthermore, the rotor assembly further includes a sealing portion 10 ; the sealing portion 10 and the second magnetic blocking portion 9 are arranged in sequence in a direction away from the rotor core 4 .

[0080] Furthermore, the rotor assembly further includes a liquid blocking component 14 ; the sealing portion 10 , the second magnetic blocking portion 9 , and the liquid blocking component 14 are arranged in sequence in a direction away from the rotor core 4 .

[0081] Further, the first auxiliary balancing weight 5 is mounted on the second magnetic blocking portion 9 ; and / or the second auxiliary balancing weight 6 is mounted on the sealing portion 10 .

[0082] Further, the first auxiliary balancing weight 5 is installed on the sealing portion 10 ; and / or the second auxiliary balancing weight 6 is installed on the liquid blocking component 14 .

[0083] Furthermore, the second magnetic shielding portion 9 is provided with a first mounting surface 11 , the first auxiliary balancing weight 5 is mounted on the first mounting surface 11 , and a sealing ring 8 is provided on the second magnetic shielding portion 9 .

[0084] Furthermore, the sealing portion 10 is disposed on the second mounting surface 13 , and the second auxiliary balancing weight 6 is mounted on the second mounting surface 13 .

[0085] Furthermore, the first auxiliary balancing weight 5 and the second magnetic blocking part 9 are an integral structure; and / or the second auxiliary balancing weight 6 and the sealing part 10 are an integral structure, which reduces the number of parts and simplifies the assembly process.

[0086] Furthermore, the second magnetic shielding portion 9 is provided with a magnetic shielding flow hole 12 corresponding to the iron core flow hole 15;

[0087] And / or, a first boss 16 is provided on a surface of the second magnetic blocking portion 9 away from the rotor core 4;

[0088] And / or, a second boss 17 is provided on the surface of the sealing portion 10 away from the rotor core 4;

[0089] And / or, a first mounting surface 11 is provided on the surface of the second magnetic blocking portion 9 away from the rotor core 4, and the first auxiliary balancing block 5 is installed on the first mounting surface 11; the main function of the first boss 16 is to support the sealing plate, and the auxiliary balancing block can be installed on the upper part of the liquid blocking component 14 or on the lower part of the liquid blocking component 14 according to different arrangements, and the second boss 17 is used to support the liquid blocking component 14

[0090] The sealing part 10 plays a sealing role to prevent the mixture reflowing from the upper cavity of the motor from mixing with the mixture flowing upward through the core flow hole in the cavity surrounded by the second magnetic shielding plate and the sealing part 10. The mixture reflowing from the upper cavity of the motor here refers to the mixture above the sealing plate; the mixture also refers to the mixture of refrigerant and refrigeration oil; the purpose is to prevent the substances above and below the sealing plate from mixing at the edge of the sealing part 10.

[0091] And / or, a second mounting surface 13 is provided on a surface of the sealing portion 10 away from the rotor core 4, and the second auxiliary balancing weight 6 is mounted on the second mounting surface 13;

[0092] And / or, a mounting hole is provided on the second magnet blocking part 9, and the second magnet blocking part 9 is installed on the main shaft part 1 through the mounting hole. A sealing ring is provided on the second magnet blocking part 9, and the sealing ring 8 corresponds to the position and size of the mounting hole.

[0093] The first magnetic shielding part 7 and the second magnetic shielding part 9 are used to fix the magnetic steel to prevent the magnetic steel from moving in the axial direction, and the first magnetic shielding part 7 and the second magnetic shielding part 9 are magnetic shielding plates that can play a magnetic shielding role.

[0094] The sealing part 10 can play a sealing role to prevent the refrigerant and refrigeration oil mixture flowing back from the upper cavity of the motor from mixing with the mixture flowing upward through the iron core flow hole 15 in the cavity surrounded by the second magnetic blocking part 9 and the sealing part 10.

[0095] The iron core flow hole 15 and the magnetic flux blocking flow hole 12 can pass a mixture of refrigerant and refrigeration oil, and can also achieve a heat dissipation effect.

[0096] The liquid blocking component 14 can provide centrifugal force to guide the refrigerant and refrigeration oil mixture flowing upward through the iron core flow hole 15 to the shell wall, separate the refrigeration oil in the refrigerant, and reduce the oil discharge rate of the compressor. The rotor assembly is surrounded by a stator assembly, and the upper end of the stator assembly has an insulating skeleton and a protruding wire package. The mixture flowing upward through the iron core flow hole 16 flows upward under the obstruction of the insulating skeleton and the wire package after flowing out of the cavity surrounded by the second magnetic shielding plate and the sealing part 10. The liquid blocking component 14 has an upwardly turned flange, and the flange of the liquid blocking component 14 is higher than the insulating skeleton and the wire package. Under the action of high-speed rotation, the flange wall of the liquid blocking component 14 shears the mixture, and the mixture moves away from the flange wall toward the shell wall under the action of high-speed rotation. The small oil droplets in the mixture gradually gather into large oil droplets, and the large oil droplets move to the lower cavity of the motor through the stator cut edge, while the oil content in the mixture in the upper cavity of the motor is reduced, thereby reducing the oil discharge rate.

[0097] The bosses on the second magnetic shielding part 9 and the sealing part 10 mainly play a supporting role. The boss of the second magnetic shielding part 9 is used to support the sealing part 10, and the boss of the sealing part 10 is used to support the liquid blocking component 14. The plane side of the second magnetic shielding part 9 is close to the upper end surface of the iron core 4. The first auxiliary balance block 5 is installed on the first mounting surface 11 of the second magnetic shielding part 9. The sealing part 10 is installed on the first boss 16 of the second magnetic shielding part 9 and the first auxiliary balance block 5. The second auxiliary balance block 6 is installed on the second mounting surface 13 of the sealing part 10. The liquid blocking component 14 is installed on the second boss 17 of the sealing part 10 and the second auxiliary balance block 6. The rotor assembly is locked by screws or rivets.

[0098] Furthermore, the magnetic shielding portion is in a plate shape, and the sealing portion 10 is in a plate shape.

[0099] According to an embodiment of the present application, a compressor is provided, including a rotor assembly, and the rotor assembly is the above-mentioned rotor assembly.

[0100] According to an embodiment of the present application, there is provided an electrical appliance, including a compressor, which is the above-mentioned compressor.

[0101] It is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0102] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application shall be included in the protection scope of the present application. The above are only preferred implementations of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present application, and these improvements and variations should also be regarded as the protection scope of the present application.

Claims

1. A rotor assembly, comprising a crankshaft; the crankshaft comprising a main shaft portion (1), an eccentric portion (2) and a rotor core (4); the eccentric portion (2) is connected to the main shaft portion (1); the rotor core (4) is arranged on the main shaft portion (1), characterized in that: The rotor assembly further comprises: A main balancing block (3), the main balancing block (3) being located at a first end of the rotor core (4); A first auxiliary balancing mass (5), wherein the first auxiliary balancing mass (5) is located at a second end of the rotor core (4); and a second auxiliary balancing mass (6), wherein the second auxiliary balancing mass (6) is located at a second end of the rotor core (4); The rotor assembly also includes a first magnetic shielding portion (7), which is installed on the first end of the rotor core (4); the rotor assembly also includes a second magnetic shielding portion (9), which is installed on the second end of the rotor core (4); an axial core flow hole (15) is provided on the rotor core (4); the mass of the first sub-balancing block (5) is m2; the mass of the second sub-balancing block (6) is m3; wherein m2>m3; the distance between the first sub-balancing block (5) and the rotor core (4) in the axial direction of the crankshaft is b; the distance between the second sub-balancing block (6) and the rotor core (4) in the axial direction of the crankshaft is c; wherein c>b.

2. The rotor assembly according to claim 1, characterized in that: The positions of the first auxiliary balancing weight (5), the second auxiliary balancing weight (6) and the eccentric portion (2) in the axial direction of the crankshaft all correspond.

3. The rotor assembly according to claim 1, characterized in that: The first auxiliary balancing mass (5) corresponds to the position of the eccentric portion (2) in the axial direction of the crankshaft; the eccentric portion (2) and the second auxiliary balancing mass (6) are respectively located on opposite sides of one diameter on the cross section of the crankshaft.

4. The rotor assembly according to claim 1, characterized in that: The rotor assembly further comprises a sealing portion (10); the first auxiliary balancing weight (5) is mounted on the second magnetic blocking portion (9); and / or the second auxiliary balancing weight (6) is mounted on the sealing portion (10).

5. The rotor assembly according to claim 4, characterized in that: The rotor assembly further comprises a liquid blocking component (14); the second magnetic blocking portion (9), the sealing portion (10), and the liquid blocking component (14) are arranged in sequence in a direction away from the rotor core (4).

6. The rotor assembly according to claim 4, characterized in that: The first auxiliary balancing mass (5) and the second magnetic shielding portion (9) are an integral structure; and / or the second auxiliary balancing mass (6) and the sealing portion (10) are an integral structure.

7. The rotor assembly according to claim 4, characterized in that: The second magnetic shielding portion (9) is provided with a magnetic shielding flow hole (12) corresponding to the iron core flow hole (15); And / or, a first boss (16) is provided on a surface of the second magnetic blocking portion (9) away from the rotor core (4); And / or, a second boss (17) is provided on a surface of the sealing portion (10) away from the rotor core (4); And / or, a first mounting surface (11) is provided on a surface of the second magnetic shielding portion (9) away from the rotor core (4), and the first auxiliary balancing block (5) is mounted on the first mounting surface (11); And / or, a second mounting surface (13) is provided on a surface of the sealing portion (10) away from the rotor core (4), and a second auxiliary balancing weight (6) is mounted on the second mounting surface (13); And / or, a mounting hole is provided on the second magnetic shielding part (9), and the second magnetic shielding part (9) is mounted on the main shaft part through the mounting hole; a sealing ring (8) is provided on the second magnetic shielding part (9), and the sealing ring (8) corresponds to the position and size of the mounting hole.

8. A compressor, comprising a rotor assembly, characterized in that: The rotor assembly is the rotor assembly according to any one of claims 1 to 7.

9. An electrical appliance, comprising a compressor, characterized in that: The compressor is a compressor as claimed in claim 8.

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