A balancing structure of a rotary compressor, a rotor assembly and a rotary compressor

Abstract

The present invention provides a balancing structure, a rotor assembly and a rotary compressor of a rotary compressor, wherein the balancing structure is a cylindrical structure, and the balancing structure includes an outer circumferential surface, a counterweight portion and a cavity portion, wherein the counterweight portion is located radially inward of the outer circumferential surface, the counterweight portion is a solid portion and is arranged on a side deviated from the central axis of the cylindrical structure, the cavity portion is located radially inward of the outer circumferential surface and connected to the counterweight portion, and the cavity portion is a sealed internal cavity. According to the present invention, the fluid wind resistance generated by the windward surface of the balancing block can be reduced, and the eddy current phenomenon generated when the refrigerant flows in the upper or lower chamber of the motor in the compressor housing can be improved, so as to achieve the purpose of reducing the power consumption of the compressor and reducing the aerodynamic noise; and the energy efficiency of the compressor operation can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of compressors, and in particular to a balancing structure of a rotary compressor, a rotor assembly and a rotary compressor. Background Art

[0002] The interior of the rotary compressor housing is mainly composed of two parts: the pump body assembly and the motor assembly. The pump body assembly includes a cylinder, rollers, a crankshaft, a vane, and upper and lower bearing assemblies. Each component cooperates with each other to form a closed suction and exhaust cavity, and the motor assembly includes a stator assembly and a rotor assembly. The rotary compressor generates a driving force on the pump body crankshaft through the motor. Under the rotation drive of the crankshaft, the volume of the compressor suction and exhaust chamber changes continuously, thereby realizing the compressor's periodic suction, compression and exhaust process. Due to the eccentric design of the crankshaft, the rotating part of the compressor (motor rotor, pump body crankshaft, pump body roller) is in an unbalanced state. In order to ensure the stable operation of the compressor, it is usually necessary to arrange primary and secondary balancing blocks with different weights at both ends of the motor rotor core to balance the imbalance of the compressor's rotating parts. During the actual operation of the compressor, the balance block rotates with the rotation of the rotor, thereby disturbing the high-pressure gas discharged from the compressor pump body, forming an airflow vortex and generating relatively large aerodynamic noise. At the same time, due to the impact of the windward surface of the balance block and the high-speed flowing refrigerant and other gas media, a large aerodynamic wind resistance is caused. Especially under high-frequency and heavy working conditions, the gas flow speed inside the compressor casing is relatively high, and this phenomenon is more serious, causing a significant increase in the energy consumption of the compressor and a significant increase in the aerodynamic noise, which is not conducive to improving the efficiency and reducing the noise of the compressor.

[0003] During the actual operation of the compressor in the prior art, the balancing block rotates with the rotation of the rotor, thereby disturbing the high-pressure gas discharged from the compressor pump body, forming an airflow vortex and generating relatively large aerodynamic noise; at the same time, the windward surface of the balancing block impacts the high-speed flowing refrigerant and other gas media, causing a large aerodynamic wind resistance. Especially under high-frequency and heavy working conditions, the gas flow speed inside the compressor casing is relatively high, and this phenomenon is more serious, resulting in a significant increase in the energy consumption of the compressor and a significant increase in the aerodynamic noise, which is not conducive to the technical problems of improving the efficiency and reducing the noise of the compressor. Therefore, the present invention studies and designs a balancing structure, a rotor assembly and a rotary compressor for a rotary compressor. Summary of the invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defect that during the actual operation of the compressor in the prior art, the balancing block rotates with the rotation of the rotor, thereby disturbing the high-pressure gas discharged from the compressor pump body, forming air flow vortex and generating large aerodynamic noise, thereby providing a balancing structure, rotor assembly and rotary compressor for a rotary compressor.

[0005] In order to solve the above problems, the present invention provides a balancing structure of a rotary compressor, wherein:

[0006] The balancing structure is a cylindrical structure, which includes an outer circumferential surface, a counterweight part and a cavity part. The counterweight part is located on the radial inner side of the outer circumferential surface. The counterweight part is a solid part and is arranged on a side deviated from the central axis of the cylindrical structure. The cavity part is located on the radial inner side of the outer circumferential surface and is connected to the counterweight part. The cavity part is a sealed internal cavity.

[0007] In some embodiments, the balancing structure includes a first sub-balancing weight and a second sub-balancing weight, the first sub-balancing weight including a first axial end face and a first opening end face, the first axial end face is located on one axial side of the first sub-balancing weight, the first opening end face is located on the other axial side of the first sub-balancing weight, and a first pit is formed on the first opening end face in a recessed manner toward the first axial end face, the second sub-balancing weight includes a second axial end face and a second opening end face, the second axial end face is located on one axial side of the second sub-balancing weight, the second opening end face is located on the other axial side of the second sub-balancing weight, and a second pit is formed on the second opening end face in a recessed manner toward the second axial end face, the first pit is butted against the second pit, and the cavity portion includes the first pit and the second pit.

[0008] In some embodiments, the first sub-balance mass includes a first counterweight, the first counterweight is located at one side of the central axis of the first sub-balance mass and connected to the first pit, the central axis of the first sub-balance mass does not pass through the first counterweight, the second sub-balance mass includes a second counterweight, the second counterweight is located at one side of the central axis of the second sub-balance mass and connected to the second pit, the central axis of the second sub-balance mass does not pass through the second counterweight, the first counterweight is connected to the second counterweight, and the counterweight portion includes the first counterweight and the second counterweight.

[0009] In some embodiments, the balancing structure further includes a third sub-balancing block, wherein the first sub-balancing block is located at one axial end of the balancing structure, the second sub-balancing block is located at the other axial end of the balancing structure, and the third sub-balancing block is located between the first sub-balancing block and the second sub-balancing block. The third sub-balancing block includes a through cavity, which extends from one axial end to the other axial end of the third sub-balancing block along the axial direction, and one end of the through cavity is connected to the first pit, and the other end is connected to the second pit.

[0010] In some embodiments, in the cross section of the balancing structure, the counterweight portion is an arcuate structure, the cavity portion is also an arcuate structure, and the counterweight portion is a minor arcuate, and the cavity portion is a major arcuate.

[0011] In some embodiments, a first through hole is also provided in the axial direction at the position of the counterweight part, a cylindrical solid structure is axially provided in the cavity part to form a columnar step, the cylindrical solid structure is connected to the outer circumferential surface, and a second through hole is provided in the axial direction on the radial inner periphery of the cylindrical solid structure.

[0012] In some embodiments, there are at least two cylindrical solid structures, which are evenly spaced in the circumferential direction on the cavity portion, and there are at least two second through holes, which are arranged in a one-to-one correspondence with the cylindrical solid structures.

[0013] The present invention also provides a rotor assembly of a rotary compressor, which includes the balancing structure of the rotary compressor described in any of the preceding items, and also includes a rotor core and a rotor baffle, wherein the rotor baffle is arranged at the upper end of the rotor core, and the balancing structure is arranged above the rotor baffle and is spaced a preset distance from the upper end surface of the rotor baffle.

[0014] In some embodiments, when the balancing structure of the rotary compressor includes a first through hole and a second through hole:

[0015] A third through hole is provided on the rotor baffle plate along the axial direction thereof, and there are at least two third through holes, one of which is arranged opposite to the first through hole, and the other of which is arranged opposite to the second through hole. The rotor assembly also includes fasteners, and there are at least two of which, one of which passes through the first through hole and the third through hole in sequence and is fixed to the rotor core, and the other of which passes through the second through hole and the third through hole in sequence and is fixed to the rotor core.

[0016] In some embodiments, a baffle column base is further provided on the axial end surface of the rotor baffle opposite to the balancing structure and located at the position of the third through hole. The baffle column base is a circular structure, and its inner circumferential cavity is opposite to and connected to the third through hole. One axial end surface of the baffle column base is connected to the rotor baffle, and the other axial end surface is abutted against the balancing structure, so as to form the preset distance through the baffle column base.

[0017] In some embodiments, the fastener includes a bolt or a screw, a first nut and a second nut, the bolt or the screw passes through the rotor core and sequentially passes through the third through hole of the rotor baffle and the first through hole or the second through hole of the balancing structure, the first nut is sleeved on the bolt or the screw and is located between the balancing structure and the rotor baffle to form the preset distance, and the second nut is arranged on the upper end surface of the balancing structure and is threadedly connected to the bolt or the screw.

[0018] In some embodiments, the fastener includes a rivet and a rivet boss, the rivet passes through the rotor core and sequentially passes through the third through hole of the rotor baffle and the first through hole or the second through hole of the balancing structure, and the rivet boss protrudes radially outward and is arranged on the outer periphery of the rivet and is located between the balancing structure and the rotor baffle to form the preset distance; or,

[0019] The fastener includes a rivet and a collar. The rivet passes through the rotor core and sequentially passes through the third through hole of the rotor baffle and the first through hole or the second through hole of the balancing structure. The collar is sleeved on the rivet and located between the balancing structure and the rotor baffle to form the preset distance.

[0020] In some embodiments, a crankshaft mating through hole is axially opened at the center position of the balancing structure, the crankshaft mating through hole can accommodate the crankshaft passing therethrough, and the crankshaft mating through hole is interference fit with the crankshaft, and the upper end of the crankshaft exceeds the upper end of the balancing structure.

[0021] In some embodiments, the balancing structure of the rotary compressor is a secondary balancing block, and the rotor assembly further includes a main balancing block, which is disposed on the lower end surface of the rotor core.

[0022] The present invention also provides a rotary compressor, which comprises the rotor assembly of the rotary compressor as described in any of the preceding items.

[0023] The balancing structure of a rotary compressor, the rotor assembly and the rotary compressor provided by the present invention have the following beneficial effects:

[0024] 1. The present invention sets the balancing structure as a cylindrical structure, forms a sealed cavity part inside, and sets a counterweight part on the side deviated from the central axis, so that the balancing block is designed as a fully sealed combined balancing block structure with an internal cavity type and an external cylindrical type along the axial direction of the rotor, thereby eliminating the windward surface structure (resistance surface) of the balancing block caused by the rotation of the rotor, thereby effectively reducing the fluid wind resistance generated by the windward surface of the balancing block, improving the eddy current phenomenon generated when the refrigerant flows in the upper cavity or lower cavity of the motor in the compressor housing, and achieving the purpose of reducing the power consumption of the compressor and reducing the aerodynamic noise; because the wind resistance to the rotor is effectively reduced, the power consumption of the compressor can be reduced, especially solving the problem of a significant increase in the power consumption caused by the wind resistance of the compressor under high-frequency heavy working conditions, reducing the power consumption of the compressor, and improving the energy efficiency of the compressor operation; achieving the effect of improving efficiency and reducing noise;

[0025] 2. The present invention places the balancing structure as a secondary balancing block on the upper end of the rotor core. Due to the fully sealed, hollow, regular cylindrical combined balancing block structure, it can not only play the role of a conventional balancing block in balancing the weight and reducing the wind resistance caused by rotation, but also have the function of an oil baffle to block and separate the oil in the mixture of exhaust gas and oil at the upper end of the rotor core, effectively reducing the oil discharge rate of the compressor under high-frequency working conditions; the rotor assembly of the present invention also effectively separates the balancing block from the rotor baffle by optimizing the rotor baffle, rivet or screw assembly structure, thereby not affecting the application effect of the motor rotor flow hole, ensuring that the compressor can normally discharge to the outside of the casing through the rotor core and the rotor baffle. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1-1 It is a schematic diagram of the assembly structure of a rotary compressor in the prior art;

[0027] Figure 1-2 It is a schematic diagram of the structure of a conventional balancing weight rotor assembly;

[0028] Figure 1-3 This is a schematic diagram of the conventional balancing block structure:

[0029] Figure 2 The three-dimensional structure diagram of the sub-balancing block in the balancing structure of the present invention is as follows:

[0030] Figure 2 -1(a) is Figure 2 A top view of the structure;

[0031] Figure 2 -1(b) Figure 2 -AA section view of 1(a);

[0032] Figure 2-2 This is a cross-sectional structural diagram of the combined balancing weight of the present invention after assembly:

[0033] Figure 2-2 (a) is the front view of the assembled combined balancing weight;

[0034] Figure 2-3 This is a schematic diagram of the rotor assembly structure of the present invention:

[0035] Figure 2-3 (a) Figure 2-3 Schematic diagram of the rotor baffle structure;

[0036] Figure 2-4 This is a schematic diagram of the assembly structure of the pump body-rotor assembly of the present invention;

[0037] Figure 3 This is a schematic diagram of the structure of an alternative embodiment 1 of the present invention;

[0038] Figure 3-1 This is a schematic diagram of the integrated rivet structure of the present invention in place of Example 2:

[0039] Figure 3-2 The present invention replaces the combined rivet structure (rivet + collar) of Example 3;

[0040] Figure 3-3 The three-dimensional structure diagram of the balancing weight of the present invention replacing the embodiment 4:

[0041] Figure 3-3 (a) Figure 3-3 Schematic diagram of the top view of the balance block

[0042] Figure 3-3 (b) Figure 3-3 (a) BB cross-sectional view;

[0043] Figure 3-3 (c) Schematic diagram of the pump body-rotor assembly structure of alternative embodiment 3.

[0044] The reference numerals are:

[0045] 1. Upper flange; 2. Cylinder; 3. Crankshaft; 4. Roller; 5. Lower flange; 6. Motor rotor; 60. Rotor core; 61. Rotor baffle; 611. Third through hole; 612. Baffle column; 613. Rotor flow hole; 62. Fastener; 621. Bolt or screw; 622. First nut; 623. Second nut; 624. Rivet; 625. Rivet boss; 626. Ring; 7. Motor stator; 8. Balance structure; 81. First sub-balance block ;811, first axial end face;812, first opening end face;82, second sub-balancing block;821, second axial end face;822, second opening end face;83, outer circumferential surface;84, counterweight part;841, first counterweight;842, second counterweight;843, first through hole;85, cavity part;851, first pit;852, second pit;86, cylindrical solid structure;861, second through hole;87, crankshaft matching through hole;9, main balancing block. DETAILED DESCRIPTION

[0046] like Figure 2 to Figure 3-3(c) The present invention provides a balancing structure of a rotary compressor, wherein:

[0047] The balancing structure 8 is a cylindrical structure, which includes an outer circumferential surface 83, a counterweight portion 84 and a cavity portion 85. The counterweight portion 84 is located radially inside the outer circumferential surface 83. The counterweight portion 84 is a solid portion and is arranged on a side deviated from the central axis of the cylindrical structure. The cavity portion 85 is located radially inside the outer circumferential surface 83 and connected to the counterweight portion 84. The cavity portion 85 is a sealed internal cavity.

[0048] The present invention arranges the balancing structure as a cylindrical structure, forms a sealed cavity part inside, and arranges a counterweight part on the side deviated from the central axis, so that the balancing block is designed as a fully sealed combined balancing block structure with an internal cavity type and an external cylindrical type along the axial direction of the rotor, thereby eliminating the windward surface structure (resistance surface) of the balancing block brought about by the rotation of the rotor, thereby effectively reducing the fluid wind resistance generated by the windward surface of the balancing block, improving the eddy current phenomenon generated when the refrigerant flows in the upper cavity or lower cavity of the motor in the compressor casing, and achieving the purpose of reducing the power consumption of the compressor and reducing aerodynamic noise; since the wind resistance to the rotor is effectively reduced, the power consumption of the compressor can be reduced, especially solving the problem of greatly increased power consumption caused by wind resistance of the compressor under high-frequency and heavy working conditions, reducing the power consumption of the compressor, and improving the energy efficiency of the compressor operation; achieving the effect of improving efficiency and reducing noise.

[0049] like Figure 1-1As shown, the interior of the rotary compressor housing is mainly composed of two parts: the pump body assembly and the motor assembly. The pump body assembly includes the upper flange 1, the cylinder 2, the crankshaft 3, the roller 4, the lower flange 5 and other main parts. The various parts cooperate with each other to form a closed suction and exhaust cavity. The motor assembly includes the motor stator 7 and the motor rotor 6. Figure 1-2 As shown, the rotary compressor rotor assembly (motor rotor 6) usually includes a rotor core 60, a main balance block 9, a secondary balance block, a rotor baffle 61 and rivets (or screws) for connecting the various components. The rotary compressor generates a driving force for the pump body to rotate the crankshaft 3 through the electromagnetic force generated between the motor rotor 6 and the motor stator 7. Under the rotational driving action of the crankshaft 3, the volume of the compressor suction and exhaust chamber changes continuously, thereby realizing the compressor's periodic suction, compression and exhaust process. Due to the eccentric design of the rotating crankshaft 3, the rotating part of the compressor (motor rotor 6, crankshaft 3, roller 4) is in an unbalanced state. In order to ensure the stable operation of the compressor, it is usually necessary to arrange main and secondary balance blocks with different weights at both ends of the motor rotor core 60 (a secondary balance block is set on the upper end face of the rotor, and a main balance block 9 is set on the lower end face) to balance the imbalance of the rotating parts of the compressor. On the other hand, for the rare earth motor currently used in the industry, a plurality of rotor flow holes 613 are usually set in the circumference of the rotor core to increase the motor flow area and reduce the air flow pulsation and aerodynamic resistance of the upper and lower cavities of the motor.

[0050] like Figure 1-2 As shown in the figure, the conventional balance block structure forms a raised step with the upper and lower end surfaces of the rotor. During the actual operation of the compressor, the balance block rotates with the rotation of the rotor, thereby disturbing the high-pressure gas discharged from the compressor pump body, forming an air flow vortex and generating large aerodynamic noise. At the same time, the windward surface of the balance block impacts with high-speed flowing refrigerant and other gas media, causing great aerodynamic wind resistance. Especially under high-frequency and heavy-duty conditions, the gas flow speed inside the compressor casing is relatively high, causing a significant increase in the energy consumption of the compressor and a significant increase in aerodynamic noise, which is not conducive to improving the efficiency and reducing the noise of the compressor.

[0051] Technical problems solved by the present invention:

[0052] 1. The rotor balance block structure of a conventional rotary compressor forms a raised step with the upper and lower end surfaces of the rotor. During the actual operation of the compressor, the balance block rotates with the rotation of the rotor, thereby disturbing the high-pressure gas discharged from the compressor pump body, forming an air flow vortex and generating relatively large aerodynamic noise.

[0053] 2. The windward surface of the balance block impacts with high-speed flowing refrigerant and other gas media, causing great aerodynamic resistance. Especially under high-frequency and heavy-duty conditions, the gas flow velocity inside the compressor casing is relatively high, causing the compressor energy consumption to drop significantly while the compressor oil discharge rate increases significantly, increasing the compressor reliability risk due to insufficient lubrication.

[0054] The present invention focuses on the above-mentioned problems and proposes an innovative structure of a compressor motor rotor assembly. The balance block is designed to be a fully sealed combined balance block structure with an internal cavity type and an external cylindrical type along the axial direction of the rotor, and any one of a baffle structure, a rivet structure or a screw assembly structure is designed to separate the balance block from the rotor core baffle. Thus, without affecting the application effect of the motor flow hole, the windward surface structure of the balance block is eliminated, the fluid wind resistance generated by the windward surface of the balance block is reduced, and the eddy current phenomenon generated when the refrigerant flows in the upper or lower chamber of the motor in the compressor housing is improved, thereby achieving the purpose of reducing the power consumption of the compressor and reducing aerodynamic noise. When the balance block of the structural design of the present invention is placed on the upper end of the rotor core as a secondary balance block, it also acts as an oil baffle to reduce the oil discharge rate of the compressor under high-frequency working conditions.

[0055] The specific implementation is described as follows:

[0056] like Figure 2 As shown in (Schematic diagram of two-dimensional and three-dimensional structure of sub-balance block), the modular balance block involved in the novel structure designed by the present invention, any sub-balance block structure of its components, includes a counterweight portion 84, a rivet or screw through hole (first through hole 843), a bottom wall (axial end face), a hollowed-out cavity (cavity portion 85), a circumferential thin wall (outer circumferential surface 83), a rivet or screw through hole column (cylindrical solid structure 86). The counterweight portion 84 of the sub-balance block is integrally formed with other non-counterweight structures, and the non-counterweight portion is hollowed out inside, and is composed of an outer circumferential surface 83 and an axial end face. The outer circumferential surface 83 is closed in the circumferential direction, and one of the upper and lower end faces is open (such as Figure 2 : The hollow cavity structure (cavity part 85) of the open end face (open end face), the sub-balance block designed by the scheme of the present invention has rivet holes or screw holes (first through holes 843) that are completely consistent with the number, size and position of the rivet holes or screw holes of the rotor core. The sub-balance block designed by the scheme of the present invention has a columnar step structure (cylindrical solid structure 86) that is consistent with the overall height of the balance block around the screw or rivet holes (first through holes 843) in the non-weighted part, which is used to strengthen the strength of the balance block and minimize the reliability risk of the balance block caused by the screw tightening force or the rivet riveting force.

[0057] The structural features of the design scheme of the present invention are different from those of the aforementioned retrieved patents. In order to solve the problems of airflow disturbance and high wind resistance caused by conventional balancing blocks, an innovative and feasible balancing block structure optimization scheme is proposed. At the same time, the new structural balancing block designed in this scheme can also serve as an oil baffle when used as a secondary balancing block, thereby reducing the oil discharge rate of the compressor, ensuring sufficient refrigerant oil inside the compressor, and improving the reliability of the compressor.

[0058] Beneficial effects: 1) The structure of the present invention eliminates the windward surface structure of the balance block by designing the balance block as a fully sealed combined balance block structure with an internal cavity type and an external cylindrical type along the axial direction of the rotor, thereby reducing the fluid wind resistance generated by the windward surface of the balance block, improving the eddy current phenomenon generated when the refrigerant flows in the upper or lower chamber of the motor in the compressor housing, and achieving the purpose of reducing the power consumption of the compressor and reducing the aerodynamic noise;

[0059] 2) When the structural balance block designed in the present invention is placed on the upper end of the rotor core as a secondary balance block, it also acts as an oil baffle to reduce the oil discharge rate of the compressor under high-frequency working conditions;

[0060] 3) The present invention designs a structural rotor assembly, and by optimizing the rotor baffle, rivet or screw assembly structure, the balancing block is separated from the rotor baffle, thereby not affecting the application effect of the motor rotor flow hole.

[0061] In some embodiments, the balancing structure 8 includes a first sub-balancing weight 81 and a second sub-balancing weight 82, the first sub-balancing weight 81 includes a first axial end face 811 and a first opening end face 812, the first axial end face 811 is located on one axial side of the first sub-balancing weight 81, the first opening end face 812 is located on the other axial side of the first sub-balancing weight 81, and a first pit 851 is formed on the first opening end face 812 in a manner concave toward the first axial end face 811, the second sub-balancing weight 82 includes a second axial end face 821 and a second opening end face 822, the second axial end face 821 is located on one axial side of the second sub-balancing weight 82, the second opening end face 822 is located on the other axial side of the second sub-balancing weight 82, and a second pit 852 is formed on the second opening end face 822 in a manner concave toward the second axial end face 821, the first pit 851 is butted against the second pit 852, and the cavity portion 85 includes the first pit 851 and the second pit 852.

[0062] This is the preferred structural form of the balancing structure of the present invention. Through the structure of the two sub-balancing blocks, one sub-balancing block has a first pit opened downward, and the other sub-balancing block has another pit opened upward. The two pits are spliced ​​to form at least a partial structure of the cavity part, which can be easily processed, and the detachable structure can effectively form the splicing of the counterweight and the cavity part, forming the counterweight effect of the eccentric structure, and forming an overall cylindrical structure through the cavity part, reducing the wind resistance to the gas flow, reducing noise, and reducing the power consumption of the crankshaft rotation, thereby improving the energy efficiency of the compressor.

[0063] In some embodiments, the first sub-balance block 81 includes a first counterweight 841, the first counterweight 841 is located on one side of the central axis of the first sub-balance block 81 and connected to the first pit 851, the central axis of the first sub-balance block 81 does not pass through the first counterweight 841, the second sub-balance block 82 includes a second counterweight 842, the second counterweight 842 is located on one side of the central axis of the second sub-balance block 82 and connected to the second pit 852, the central axis of the second sub-balance block 82 does not pass through the second counterweight 842, the first counterweight 841 is connected to the second counterweight 842, and the counterweight portion 84 includes the first counterweight 841 and the second counterweight 842. This is a further preferred structural form of the balancing structure of the present invention, that is, the first sub-balance block forms the first counterweight, the second sub-balance block forms the second counterweight, the two counterweights are spliced ​​to form a complete counterweight structure, forming a complete eccentric structure counterweight effect, and the cavity portion forms an overall cylindrical structure, which reduces the wind resistance to gas flow, reduces noise, and reduces the power consumption of crankshaft rotation, thereby improving the energy efficiency of the compressor.

[0064] like Figure 2-2 As shown, the combined balancing block designed in the present invention is composed of at least two sub-balancing blocks (a first sub-balancing block 81 and a second sub-balancing block 82). The assembly relationship of the two sub-balancing blocks is as shown in FIG. Figure 2-2 As shown, each sub-balance is stacked in sequence along the axial direction of the rotor, and the rivet or screw through holes (first through holes 843) correspond to each other one by one, wherein the open end face of the innermost terminal balance block (lower terminal balance block) close to the rotor core is placed away from the end face of the rotor core (i.e. facing upward), and the open end face of the outermost terminal balance block (upper terminal balance block) away from the rotor core is placed close to the end face of the core (i.e. facing downward), so that the combined balance block forms a fully sealed internal cavity and the outside is a smooth cylindrical structure, so as to achieve the effect of completely isolating the cavity in the combined balance block from the high-pressure gas inside the shell, avoiding the high-pressure and high-flow rate gas in the upper and lower cavities of the motor from entering the internal cavity of the combined balance block, completely eliminating the raised step structure of the conventional balance block and the windward surface formed by it, thereby reducing the fluid wind resistance generated by the windward surface of the balance block, improving the eddy current phenomenon generated when the refrigerant flows in the upper or lower cavity of the motor in the compressor shell, greatly reducing the aerodynamic resistance power consumption, and improving the aerodynamic noise of the compressor.

[0065] Alternative embodiment 3, in some embodiments, the balancing structure further includes a third sub-balancing weight (not shown), the first sub-balancing weight 81 is located at one axial end of the balancing structure, the second sub-balancing weight 82 is located at the other axial end of the balancing structure, the third sub-balancing weight is located between the first sub-balancing weight 81 and the second sub-balancing weight 82, the third sub-balancing weight includes a through cavity, the through cavity passes through from one axial end to the other axial end of the third sub-balancing weight along the axial direction, and one end of the through cavity is connected to the first pit, and the other end is connected to the second pit.

[0066] The combined balancing block structure designed by the present invention is not limited to the combination of two sub-balancing blocks as described in the optimal embodiment, and can also select 3 or more sub-balancing blocks to be stacked in sequence along the axial direction of the rotor according to the weight demand, but it must be ensured that the open end faces of the two sub-balancing blocks at both ends are placed opposite to each other, the open end face of the sub-balancing block close to the rotor core is placed away from the end face of the rotor core, and the open end face of the sub-balancing block away from the rotor core is placed close to the end face of the core, so that the combined balancing block forms a plurality of interlayer cavities along the axial direction of the rotor and a smooth cylindrical structure on the outside, completely eliminating the raised step structure of the conventional balancing block and the windward surface formed by it;

[0067] When the combined balancing block designed in the present invention is composed of 3 or more sub-balancing blocks, the placement direction of the sub-balancing blocks at the non-two end portions can be arbitrarily selected, and the structure of the sub-balancing blocks at the non-two end portions is not limited to the cavity structure with one end face of the sub-balancing block open in the optimal embodiment, and can be designed as a through cavity structure with both ends open. Then, the combined balancing block forms a plurality of interconnected cavities along the axial direction of the rotor inside and a smooth cylindrical structure outside.

[0068] In some embodiments, in the cross section of the balancing structure 8, the counterweight portion 84 is an arched structure, the cavity portion 85 is also an arched structure, and the counterweight portion 84 is a minor arc, and the cavity portion 85 is a major arc. This is a preferred structural form of the balancing structure of the present invention. Figure 2 As shown, the minor arc structure can make the counterweight part form a position deviated from the central axis, which plays an effective role in eccentric centering, and the remaining part is a cavity part, which is a major arc, which can make the center of gravity tilt toward the counterweight part. The minor arc is the arc shape when the arc is smaller than the semicircle, and the major arc is the arc shape when the arc is larger than the semicircle.

[0069] In some embodiments, a first through hole 843 is also provided in the axial direction at the position of the counterweight part 84, a cylindrical solid structure 86 is provided in the axial direction in the cavity part 85 to form a columnar step, the cylindrical solid structure 86 is connected to the outer circumferential surface 83, and a second through hole 861 is provided in the axial direction on the radial inner circumference of the cylindrical solid structure 86. The present invention can penetrate fasteners through the first through hole to fix the balancing structure to the rotor core or the rotor baffle, the cylindrical solid structure can provide structural support for the cavity part, and the second through hole can also be used to penetrate fasteners to fix the balancing structure to the rotor core or the rotor baffle.

[0070] In some embodiments, there are at least two cylindrical solid structures 86, which are evenly spaced in the circumferential direction on the cavity portion 85, and there are at least two second through holes 861, which are arranged one-to-one with the cylindrical solid structures 86. This is a preferred structural form of the cylindrical solid structure and the second through hole of the present invention, and multiple fasteners can be inserted through multiple cylindrical solid structures and second through holes to improve the fastening effect, and multiple cylindrical solid structures can enhance the supporting effect.

[0071] The present invention also provides a rotor assembly of a rotary compressor, which includes the balancing structure of the rotary compressor described in any of the preceding items, and also includes a rotor core 60 and a rotor baffle 61, wherein the rotor baffle 61 is arranged at the upper end of the rotor core 60, and the balancing structure 8 is arranged above the rotor baffle 61 and is spaced a preset distance from the upper end surface of the rotor baffle 61.

[0072] The present invention places the balancing structure as a secondary balancing block on the upper end of the rotor core. Due to the fully sealed hollow regular cylindrical combined balancing block structure, it can not only play the balancing weight effect of a conventional balancing block and reduce the wind resistance generated by rotation, but also have the function of an oil baffle to block and separate the oil in the mixture of exhaust gas and oil at the upper end of the rotor core, effectively reducing the oil discharge rate of the compressor under high-frequency working conditions; the rotor assembly of the present invention also effectively separates the balancing block from the rotor baffle by optimizing the rotor baffle, rivet or screw assembly structure, thereby not affecting the application effect of the motor rotor flow hole, ensuring that the compressor can normally discharge to the outside of the casing through the rotor core and the rotor baffle.

[0073] In some embodiments, when the balancing structure of the rotary compressor includes the first through hole 843 and the second through hole 861:

[0074] The rotor baffle 61 is provided with a third through hole 611 penetrating along its axial direction, and there are at least two third through holes 611, one of which is arranged opposite to the first through hole 843, and the other of which is arranged opposite to the second through hole 861. The rotor assembly also includes fasteners 62, and there are at least two fasteners 62, one of which passes through the first through hole 843 and the third through hole 611 in sequence and is fixed to the rotor core 60, and the other of which passes through the second through hole 861 and the third through hole 611 in sequence and is fixed to the rotor core 60.

[0075] This is a preferred structural form of the rotor baffle of the present invention. The third through hole and the plurality of fasteners can accommodate the penetration of fasteners to simultaneously fix the rotor baffle and the balancing component to the rotor core.

[0076] In some embodiments, a baffle column 612 is further provided on the axial end face of the rotor baffle 61 opposite to the balancing structure 8 and located at the position of the third through hole 611. The baffle column 612 is a circular ring-shaped structure, and its inner peripheral cavity is opposite to and communicates with the third through hole 611. One axial end face of the baffle column 612 is connected to the rotor baffle 61, and the other axial end face is abutted against the balancing structure 8, so as to form the preset distance through the baffle column 612. The present invention can effectively abut the lower end of the balancing block against the baffle column through the provision of the baffle column, effectively separate the balancing block from the rotor baffle, thereby not affecting the application effect of the motor rotor flow hole, and ensuring that the compressor can be discharged to the outside of the housing through the rotor core and the rotor baffle normally.

[0077] like Figure 2-3 As shown in (a), the main and auxiliary balancing blocks in the rotor assembly of the present invention have at least the auxiliary balancing block (balancing structure 8) as shown in FIG. Figure 2-4 The combined balancing block structure shown in the figure is assembled with fasteners 62 (rivets or screws) through its sub-balancing block through-hole structure (first through-hole, second through-hole), so that each sub-balancing block cooperates with each other and is fixedly connected with the rotor baffle 61 and the rotor core 60. At the same time, in order to avoid the bottom wall (axial end face, especially the lower end face) of the balancing block blocking the rotor flow hole, thereby affecting the flow area of ​​the motor and causing the air flow pulsation in the upper and lower chambers of the motor to increase, as shown in FIG. Figure 2-3 As shown in (a), the present invention is designed to set a baffle column 61 on the rotor baffle 61, and the baffle column is in the shape of a circular column, the center of the column coincides with the center of the baffle rivet hole (or screw hole), and the circumferential surface of the inner hole of the column is consistent with the baffle rivet hole (or screw hole), which is used to isolate the bottom wall surface of the combined balancing block and the end surface of the baffle, thereby reducing the influence of the application effect of the rotor flow hole of the fully sealed combined balancing block structure.

[0078] like Figure 2-4The figure shows a schematic diagram of the pump body-rotor assembly structure of the optimal embodiment of the present invention, wherein the main balancing block 9 and the auxiliary balancing block (balancing structure 8) are at least assembled by two sub-balancing blocks, and are designed as a new type of combined balancing block structure with an internal cavity type and an external cylindrical type along the axial direction of the rotor, which completely eliminates the windward surface structure of the balancing block. At the same time, a column structure is designed on the rotor baffle to isolate the bottom surface of the balancing block from the baffle, thereby solving the drawbacks of the conventional balancing block structure technology and solving the problem in the disclosed patent that the disturbance of the windward surface of the balancing block to the airflow and the application effect of the rotor flow hole cannot be completely eliminated due to the non-fully sealed structure.

[0079] In addition, when the structural balance block designed in the present invention is placed on the upper end of the rotor as a sub-balance block, it also acts as an oil baffle. When the mixed gas of refrigerant and refrigerant oil in the compressor flows from the lower cavity of the compressor to the upper cavity through the rotor flow holes, etc., it contacts the non-open surface of the sub-balance block of the combined balance block close to the upper end face of the rotor core, thereby separating the refrigerant and the refrigerant oil. The refrigerant oil is retained in the compressor, reducing the oil discharge rate of the compressor under high-frequency working conditions, avoiding the risk of compressor reliability caused by insufficient lubrication, and thus improving the reliability of the compressor.

[0080] The rotor assembly for the compressor designed by the present invention has a novel structure of a combined balancing block, and the heights of the sub-balancing blocks can be designed to be equal or unequal according to actual needs, the counterweight structures of the sub-balancing blocks can be designed to be the same or different, and the materials of the sub-balancing blocks can be selected to be the same or different according to needs. Preferably, the combined balancing block can be designed as a combined structure of two sub-balancing blocks with exactly the same structure to reduce the number of parts and facilitate processing.

[0081] Alternative embodiment 1, such as Figure 3 In some embodiments, the fastener 62 includes a bolt or screw 621, a first nut 622 and a second nut 623. The bolt or screw 621 passes through the rotor core 60 and sequentially passes through the third through hole 611 of the rotor baffle 61 and the first through hole 843 or the second through hole 861 of the balancing structure 8. The first nut 622 is sleeved on the bolt or screw 621 and is located between the balancing structure 8 and the rotor baffle 61 to form the preset distance. The second nut 623 is arranged on the upper end surface of the balancing structure 8 and is threadedly connected with the bolt or screw 621. This is a preferred structural form of the present invention to replace Example 1. Figure 3-1As shown, in addition to the baffle column structure designed on the baffle in the optimal embodiment, when screw connection is adopted, it can be designed as a double nut fixing structure, each screw first fixes the rotor core and the baffle through the first nut 622, and then installs the combined balancing block above the first nut, and then installs the second nut 623 above the combined balancing block to fix the balancing block, so as to isolate the balancing block from the rotor baffle, so as to achieve the purpose of not affecting the application effect of the rotor flow hole;

[0082] Alternative embodiments 2 and 3, such as Figure 3-1 , Figure 3-2 In some embodiments, the fastener 62 includes a rivet 624 and a rivet boss 625. The rivet 624 passes through the rotor core 60 and sequentially passes through the third through hole 611 of the rotor baffle 61 and the first through hole 843 or the second through hole 861 of the balancing structure 8. The rivet boss 625 protrudes radially outward and is arranged on the outer periphery of the rivet 624 and is located between the balancing structure 8 and the rotor baffle 61 to form the preset distance. This is a preferred structural form of the present invention instead of Embodiment 2. Figure 3-1 As shown, in addition to the design of the baffle column structure on the baffle in the best embodiment, when rivets are used for connection, as shown in FIG. Figure 3-1 As shown, a rivet boss 625 can be designed at an appropriate position of the rivet, and the rivet boss is assembled above the rotor baffle, thereby also isolating the balancing block from the rotor baffle, so as to achieve the purpose of not affecting the application effect of the rotor flow hole.

[0083] The fastener 62 includes a rivet 624 and a collar 626. The rivet 624 passes through the rotor core 60 and sequentially passes through the third through hole 611 of the rotor baffle 61 and the first through hole 843 or the second through hole 861 of the balancing structure 8. The collar 626 is sleeved on the rivet 624 and located between the balancing structure 8 and the rotor baffle 61 to form the preset distance. This is a preferred structural form of the present invention instead of embodiment 3. Preferably, except Figure 3-1 In addition to the one-piece rivet structure shown, it can also be designed as Figure 3-2 In the structure shown, the boss is designed as a collar structure, and the collar is assembled between the rotor baffle and the balancing block, and is designed as a "rivet + collar" combined structure.

[0084] Alternative embodiment 4, such as Figure 3-3 to Figure 3-3(c) In some embodiments, a crankshaft mating through hole 87 is axially opened at the center of the balancing structure 8, and the crankshaft mating through hole 87 can accommodate the crankshaft 3 to pass through, and the crankshaft mating through hole 87 and the crankshaft 3 are interference fit, and the upper end of the crankshaft 3 exceeds the upper end of the balancing structure 8. Figure 3-3As shown, in addition to the rotor balancing block structure described in the optimal embodiment, a central through hole can also be designed on the new structure of each sub-balancing block of the combined balancing block for interference fit with the pump crankshaft. At this time, the long axis end of the crankshaft needs to fully extend out of the combined sub-balancing block, so that the combined balancing block forms a completely sealed internal cavity, preventing the high-pressure and high-flow rate gas in the upper and lower cavities of the motor from entering the internal cavity of the combined balancing block.

[0085] In some embodiments, the balancing structure of the rotary compressor is a secondary balancing block, and the rotor assembly further includes a main balancing block 9 , which is disposed on the lower end surface of the rotor core 60 .

[0086] The present invention also provides a rotary compressor, which comprises the rotor assembly of the rotary compressor as described in any of the preceding items.

[0087] 1. The present invention provides a rotor assembly for a rotary compressor, the rotor assembly comprises a main balancing block, a secondary balancing block, a rotor core, and a rotor baffle, each component being connected and fixedly assembled by rivets or screws, at least the secondary balancing block (the balancing block far away from the pump body assembly) of the main and secondary balancing blocks is a fully sealed combined balancing block structure with a cavity in the middle and a regular cylindrical outer surface, and the rotor baffle has a baffle boss structure; the combined balancing block structure comprises at least two sub-balancing blocks. The counterweight and non-counterweight parts of any of the sub-balancing blocks are integrally formed, and are a cavity structure in which the non-counterweight part is hollowed out with the outer circumferential surface closed in the circumferential direction and one of the upper and lower end surfaces open (the non-counterweight part is hollowed out so as not to affect the balance counterweight); the novel structure of any of the sub-balancing blocks has through holes that are consistent in number, size, and position with the rivet holes or screw holes of the rotor core, and the periphery of the screw or rivet through holes in the non-counterweight part is designed as a columnar step that is consistent with the overall height of the balancing block, so as to enhance the strength of the balancing block.

[0088] 2. The matching structure of each sub-balancing block of the combined balancing block of the present invention is stacked in sequence along the axial direction of the rotor, and the rivet through holes (or screw through holes) thereof are matched one by one, and the screws or rivets are assembled through the through hole structure to match and fix the rotor core, and the open end surface of the sub-balancing block close to the rotor core is placed away from the end surface of the rotor core, and the open end surface of the sub-balancing block away from the rotor core is placed close to the end surface of the core, so that the combined balancing block forms an internal cavity and a smooth cylindrical structure on the outside, completely eliminating the raised step structure of the conventional balancing block and the windward surface formed by it;

[0089] 3. The rotor baffle of the present invention has a baffle column in the shape of a circular column, the center of the baffle boss coincides with the center of the baffle rivet hole (or screw hole), and the circumferential surface of the inner hole is consistent with the baffle rivet hole (or screw hole);

[0090] 4. The motor rotor assembly of the present invention has a new structure of a combined balancing block, and the heights of the sub-balancing blocks can be designed to be equal or unequal, and the weight structures of the sub-balancing blocks can be designed to be the same or different, according to actual needs. Preferably, the combined balancing block can be designed as a combination structure of two sub-balancing blocks with exactly the same structure, so as to reduce the types of parts and facilitate processing;

[0091] 5. The rotor assembly of the present invention, when connected by screws, can remove the baffle boss structure, and use double nuts for fixed connection, the first nut is used to fix the rotor core and the baffle and separate the baffle from the balancing block, and the second nut is used to fix the balancing block. When connected by rivets, the rivet has a stepped structure, and the step is used to separate the rotor baffle and the balancing block. Preferably, the rivet step structure can be designed as an independent collar structure.

[0092] 6. The present invention can also design the central through hole of each sub-balance block of the combined balance block in a novel structure for interference fit with the crankshaft of the pump body. In this case, the long axis end of the crankshaft needs to completely extend out of the combined sub-balance block, so that the combined balance block forms a completely sealed internal cavity, preventing the high-pressure and high-flow gas in the upper and lower cavities of the motor from entering the internal cavity of the combined balance block.

[0093] 7. When the combined balancing weight structure of the present invention is composed of three or more sub-balancing weights, the placement direction of the sub-balancing weights at the non-two end parts can be arbitrarily selected, and the sub-balancing weight structure at the non-two end parts can be designed as a through-cavity structure with both ends open, so that the combined balancing weight forms a cylindrical structure with multiple connected cavities along the axial direction of the rotor and a smooth outer surface;

[0094] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. 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 invention. These improvements and variations should also be regarded as the protection scope of the present invention.

Claims

1. A balancing structure of a rotary compressor, Features: The balancing structure (8) is a cylindrical structure, comprising an outer circumferential surface (83), a counterweight portion (84) and a cavity portion (85), wherein the counterweight portion (84) is located radially inward of the outer circumferential surface (83), the counterweight portion (84) is a solid portion and is arranged on a side deviated from the central axis of the cylindrical structure, the cavity portion (85) is located radially inward of the outer circumferential surface (83) and connected to the counterweight portion (84), and the cavity portion (85) is a sealed internal cavity; The balancing structure (8) comprises a first sub-balancing block (81) and a second sub-balancing block (82); the first sub-balancing block (81) comprises a first axial end face (811) and a first opening end face (812); the first axial end face (811) is located on one axial side of the first sub-balancing block (81); the first opening end face (812) is located on the other axial side of the first sub-balancing block (81); a first recess (851) is formed on the first opening end face (812) in a manner concave toward the first axial end face (811); and the second sub-balancing block (82) comprises A second axial end face (821) and a second opening end face (822), wherein the second axial end face (821) is located on one axial side of the second sub-balancing weight (82), and the second opening end face (822) is located on the other axial side of the second sub-balancing weight (82), and a second pit (852) is formed on the second opening end face (822) in a manner recessed toward the second axial end face (821), the first pit (851) is butted against the second pit (852), and the cavity portion (85) includes the first pit (851) and the second pit (852).

2. The balancing structure of the rotary compressor according to claim 1, Features: The first sub-balance block (81) comprises a first counterweight (841), the first counterweight (841) being located on one side of the central axis of the first sub-balance block (81) and being connected to the first recess (851), the central axis of the first sub-balance block (81) not passing through the first counterweight (841), the second sub-balance block (82) comprising a second counterweight (842), the second counterweight (842) being located on one side of the central axis of the second sub-balance block (82) and being connected to the second recess (852), the central axis of the second sub-balance block (82) not passing through the second counterweight (842), the first counterweight (841) and the second counterweight (842) being connected to each other, and the counterweight portion (84) comprising the first counterweight (841) and the second counterweight (842).

3. The balancing structure of the rotary compressor according to claim 1, Features: The balancing structure further comprises a third sub-balancing block, wherein the first sub-balancing block (81) is located at one axial end of the balancing structure, the second sub-balancing block (82) is located at the other axial end of the balancing structure, the third sub-balancing block is located between the first sub-balancing block (81) and the second sub-balancing block (82), and the third sub-balancing block comprises a through cavity, wherein the through cavity penetrates from one axial end to the other axial end of the third sub-balancing block along the axial direction, and one end of the through cavity is communicated with the first pit, and the other end of the through cavity is communicated with the second pit.

4. The balancing structure of the rotary compressor according to claim 1, Features: In the cross section of the balancing structure (8), the counterweight portion (84) is an arch-shaped structure, the cavity portion (85) is also an arch-shaped structure, and the counterweight portion (84) is a minor arc, and the cavity portion (85) is a major arc.

5. The balancing structure of the rotary compressor according to any one of claims 1 to 4, Features: A first through hole (843) is also provided in the axial direction at the position of the counterweight portion (84), a cylindrical solid structure (86) is provided in the axial direction in the cavity portion (85) to form a columnar step, the cylindrical solid structure (86) is connected to the outer circumferential surface (83), and a second through hole (861) is provided in the axial direction on the radial inner circumference of the cylindrical solid structure (86).

6. The balancing structure of the rotary compressor according to claim 5, Features: There are at least two cylindrical solid structures (86), which are evenly spaced and arranged on the cavity portion (85) along the circumferential direction. There are also at least two second through holes (861), which are arranged in a one-to-one correspondence with the cylindrical solid structures (86).

7. A rotor assembly of a rotary compressor, Features: A balancing structure for a rotary compressor comprising any one of claims 1 to 6, further comprising a rotor core (60) and a rotor baffle (61), wherein the rotor baffle (61) is arranged at the upper end of the rotor core (60), and the balancing structure (8) is arranged above the rotor baffle (61) and is spaced a preset distance from the upper end surface of the rotor baffle (61).

8. The rotor assembly of the rotary compressor according to claim 7, Features: When the balancing structure of the rotary compressor comprises a first through hole (843) and a second through hole (861): The rotor baffle (61) is provided with a third through hole (611) penetrating along the axial direction thereof, and there are at least two third through holes (611), one of which is arranged opposite to the first through hole (843), and the other of which is arranged opposite to the second through hole (861). The rotor assembly further comprises a fastener (62), and there are also at least two fasteners (62), one of which passes through the first through hole (843) and the third through hole (611) in sequence and is fixed to the rotor core (60), and the other of which passes through the second through hole (861) and the third through hole (611) in sequence and is fixed to the rotor core (60).

9. The rotor assembly of the rotary compressor according to claim 8, Features: A baffle column base (612) is also provided on the axial end surface of the rotor baffle (61) opposite to the balancing structure (8) and located at the position of the third through hole (611); the baffle column base (612) is a circular ring-shaped structure, and its inner peripheral cavity is opposite to and communicates with the third through hole (611); one axial end surface of the baffle column base (612) is connected to the rotor baffle (61) and the other axial end surface is abutted against the balancing structure (8), so as to form the preset distance through the baffle column base (612).

10. The rotor assembly of the rotary compressor according to claim 8, Features: The fastener (62) comprises a bolt or a screw (621), a first nut (622) and a second nut (623); the bolt or the screw (621) passes through the rotor core (60) and sequentially passes through the third through hole (611) of the rotor baffle (61) and the first through hole (843) or the second through hole (861) of the balancing structure (8); the first nut (622) is sleeved on the bolt or the screw (621) and is located between the balancing structure (8) and the rotor baffle (61) to form the preset distance; the second nut (623) is arranged on the upper end surface of the balancing structure (8) and is threadedly connected to the bolt or the screw (621).

11. The rotor assembly of the rotary compressor according to claim 8, Features: The fastener (62) comprises a rivet (624) and a rivet boss (625), the rivet (624) passing through the rotor core (60) and sequentially passing through the third through hole (611) of the rotor baffle (61) and the first through hole (843) or the second through hole (861) of the balancing structure (8), the rivet boss (625) protruding radially outwardly and arranged on the outer periphery of the rivet (624) and located between the balancing structure (8) and the rotor baffle (61) to form the preset distance; or, The fastener (62) comprises a rivet (624) and a collar (626); the rivet (624) passes through the rotor core (60) and sequentially passes through the third through hole (611) of the rotor baffle (61) and the first through hole (843) or the second through hole (861) of the balancing structure (8); the collar (626) is sleeved on the rivet (624) and is located between the balancing structure (8) and the rotor baffle (61) to form the preset distance.

12. The rotor assembly of the rotary compressor according to claim 7, Features: A crankshaft matching through hole (87) is axially provided at the center of the balancing structure (8), the crankshaft matching through hole (87) being capable of accommodating the crankshaft (3) to pass therethrough, the crankshaft matching through hole (87) being interference fit with the crankshaft (3), and the upper end of the crankshaft (3) protruding beyond the upper end of the balancing structure (8).

13. The rotor assembly of the rotary compressor according to claim 7, Features: The balancing structure of the rotary compressor is a secondary balancing block, and the rotor assembly further comprises a main balancing block (9), wherein the main balancing block (9) is arranged on the lower end surface of the rotor core (60).

14. A rotary compressor, Features: A rotor assembly for a rotary compressor comprising any one of claims 7-13.

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