Rotor assembly, compressor and refrigeration equipment

Abstract

The utility model discloses a rotor assembly, a compressor and refrigeration equipment, and belongs to the technical field of compressors. The rotor assembly comprises a rotor iron core, a crankshaft and a balance block, the rotor iron core is provided with shaft holes and through-flow holes which are arranged at intervals, and the through-flow holes penetrate through the rotor iron core in the axial direction of the rotor iron core; one end of the crankshaft penetrates through the shaft hole, and the other end is connected with the pump body assembly; the first balance block is arranged at the end, facing the pump body assembly, of the rotor iron core. A first baffle ring and a second baffle ring are arranged at the end, facing the pump body assembly, of the rotor core, the second baffle ring is arranged on the outer side of the first baffle ring in the radial direction of the rotor core, the second baffle ring and the first baffle ring are arranged in a spaced mode, and a first through hole allowing the crankshaft to penetrate through and communicating with the through-flow hole is formed in the first baffle ring. The first balance block is installed between the first baffle ring and the second baffle ring. According to the utility model, air in the through-flow hole and the gap between the rotor iron core and the stator iron core is prevented from flowing to an area through which the first balance block rotationally passes, so that the occurrence of refrigerant countercurrent is further prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of compressors, in particular to a rotor assembly, a compressor and a refrigeration device. Background Art

[0002] In the related art, due to the eccentricity of the crankshaft in the rotor assembly, an unbalanced force is generated. Therefore, in a traditional compressor, balance blocks are usually installed at both ends of the rotor core to balance the generated unbalanced force. Among them, the mass and volume of the balance block near the eccentric shaft side of the crankshaft are both larger than those of the balance block far from the eccentric shaft side of the crankshaft. Due to the difference in the mass and volume of the two balance blocks, the negative pressure generated near the eccentric shaft side is greater than the negative pressure generated far from the eccentric shaft side, resulting in the refrigerant in the flow passage holes and the refrigerant in the gap between the rotor and the stator flowing reversely. Some of the refrigerant turns to flow upward through the gap between the stator assembly and the compressor housing, and then it is difficult for the oil to fall back downward through the gap between the stator assembly and the compressor housing. Summary of the Utility Model

[0003] The utility model aims to at least solve one of the technical problems existing in the prior art. For this purpose, the utility model provides a rotor assembly, which can reduce the influence of the negative pressure generated by the balance block on the flow passage holes and the gap between the rotor core and the stator core, thereby suppressing the air flow in the flow passage holes and the gap between the rotor core and the stator core to the area passed by the first balance block during rotation, and further reducing the refrigerant reverse flow, which helps the oil to fall back through the gap between the stator assembly and the compressor housing.

[0004] The utility model also provides a compressor and a refrigeration device including the above rotor assembly.

[0005] According to the rotor assembly of the first aspect embodiment of the utility model, it includes: a rotor core, a crankshaft and a balance block. The rotor core is provided with an axially spaced shaft hole and a flow passage hole, and the flow passage hole axially penetrates the rotor core; one end of the crankshaft is inserted into the shaft hole, and the other end is used for connecting with a pump body assembly; the first balance block is arranged at one end of the rotor core facing the pump body assembly; wherein, a first retaining ring and a second retaining ring are arranged at one end of the rotor core facing the pump body assembly. In the radial direction of the rotor core, the second retaining ring is arranged outside the first retaining ring and is spaced from the first retaining ring. A first through hole for the crankshaft to pass through and communicate with the flow passage hole is formed inside the first retaining ring, and the first balance block is installed between the first retaining ring and the second retaining ring.

[0006] The rotor assembly according to the embodiment of the utility model has at least the following beneficial effects:

[0007] In the rotor assembly according to the embodiment of the present utility model, a first retaining ring and a second retaining ring are provided on the end face of the rotor core facing the pump body assembly. Among them, in the radial direction of the rotor core, the first retaining ring and the second retaining ring are arranged at intervals, thereby defining a space capable of installing the first balance weight. The first balance weight is installed between the first retaining ring and the second retaining ring; during the operation of the compressor with the rotor assembly installed, the first retaining ring can block the air in the flow-through hole from flowing to the area passed by the first balance weight during rotation, and the second retaining ring can block the air in the gap between the rotor core and the stator core from flowing to the area passed by the first balance weight during rotation, thereby reducing the negative pressure generated during the rotation of the first balance weight. This not only avoids the negative pressure generated by the first balance weight from hindering the normal flow of the refrigerant in the flow-through hole, but also avoids the negative pressure generated by the first balance weight from hindering the normal flow of the refrigerant in the gap between the rotor core and the stator core. Furthermore, it effectively suppresses the occurrence of reverse flow of the refrigerant in the flow-through hole and in the gap between the rotor core and the stator core, which helps the oil to fall back in the gap between the stator assembly and the compressor housing.

[0008] According to some embodiments of the present utility model, the rotor assembly further includes a first end plate. The first end plate is fixedly provided on the end face of the rotor core facing the pump body assembly and is arranged along the circumferential direction of the rotor core. In the radial direction of the rotor core, one end of the first end plate is connected to the first retaining ring, and the other end is connected to the second retaining ring. The first balance weight is connected to the end of the first end plate facing away from the rotor core.

[0009] According to some embodiments of the present utility model, along the axial direction of the rotor core, on the projection plane perpendicular to the axial direction of the rotor core, the projection of the first balance weight is within the projection of the outer peripheral wall of the rotor core.

[0010] According to some embodiments of the present utility model, the rotor assembly further includes a first fastener. The first fastener passes through the first balance weight and the first end plate and is fixedly connected to the rotor core.

[0011] According to some embodiments of the present utility model, in the radial direction of the rotor core, the minimum distance between the first retaining ring and the second retaining ring is greater than the maximum width of the first balance weight.

[0012] According to some embodiments of the present utility model, the first through hole is a round hole, the aperture of the first through hole is R5, along the axial direction of the rotor core, the height of the first retaining ring is H1, satisfying: 2mm ≤ H1 ≤ R5, and the height of the second retaining ring is H2, satisfying: 2mm ≤ H2 ≤ R5.

[0013] According to some embodiments of the present utility model, along the axial direction of the rotor core, the height of the first balance block is H3, and the height of the first retaining ring is H1, satisfying: 0.2H3 ≤ H1 ≤ 3H3. The height of the second retaining ring is H2, satisfying: 0.2H3 ≤ H2 ≤ 3H3.

[0014] According to some embodiments of the present utility model, the second retaining ring is annular. Along the radial direction of the rotor core, the maximum outer diameter of the rotor core is R1, and the outer diameter of the second retaining ring is R2, satisfying: 0.9R1 ≤ R2 ≤ R1.

[0015] According to some embodiments of the present utility model, a plurality of flow-through holes are provided. The plurality of flow-through holes are arranged at intervals along the circumferential direction of the shaft hole. Along the axial direction of the rotor core, at least a part of the projection of the first through hole covers the projections of the plurality of flow-through holes, and the projection area of the first through hole is greater than or equal to 0.5 times the sum of the projection areas of all the flow-through holes.

[0016] According to some embodiments of the present utility model, the rotor assembly further includes a second end plate and a second balance block. The second end plate is fixedly arranged on the end face of the rotor core facing away from the pump body assembly, and the second balance block is connected to one end of the second end plate facing away from the rotor core.

[0017] A compressor according to an embodiment of the second aspect of the present utility model includes a housing, a stator core, a pump body assembly, and a rotor assembly as described in the embodiment of the first aspect. The stator core, the pump body assembly, and the rotor assembly are installed in the housing. The rotor core is rotatably arranged in the stator core, and the crankshaft is rotatably arranged in the pump body assembly.

[0018] The compressor according to the embodiment of the present utility model has at least the following beneficial effects:

[0019] The compressor adopts the rotor assembly of the embodiment of the first aspect. By providing the first retaining ring and the second retaining ring, and installing the first balance block between the first retaining ring and the second retaining ring, the first retaining ring blocks the air in the flow-through hole from flowing to the area passed by the first balance block during rotation, and the second retaining ring blocks the air in the gap between the rotor core and the stator core from flowing to the area passed by the first balance block during rotation. Thereby, the negative pressure generated during the rotation of the first balance block is reduced. This not only avoids the negative pressure generated by the first balance block from hindering the normal circulation of the refrigerant in the flow-through hole, but also avoids the negative pressure generated by the first balance block from hindering the normal circulation of the refrigerant in the gap between the rotor core and the stator core. Furthermore, the occurrence of refrigerant backflow in the flow-through hole and the gap between the rotor core and the stator core is effectively suppressed, which helps the oil to fall back in the gap between the stator assembly and the compressor housing, improves the stability of the oil level in the compressor cavity, thereby reducing the wear of the compressor and extending the service life of the compressor.

[0020] The refrigeration device according to the third aspect embodiment of the present utility model includes a compressor as described in the second aspect embodiment.

[0021] The refrigeration device according to the embodiment of the present utility model has at least the following beneficial effects:

[0022] The refrigeration device adopts the compressor of the second aspect embodiment. By suppressing the occurrence of refrigerant backflow in the flow passage hole and in the gap between the rotor core and the stator core, the oil can more easily fall back in the gap between the stator assembly and the compressor housing, thereby improving the stability of the oil level in the compressor cavity, reducing the wear of the compressor, improving the operating stability of the refrigeration device, and extending the service life of the refrigeration device.

[0023] The additional aspects and advantages of the present utility model will be partially given in the following description, partially become apparent from the following description, or be understood through the practice of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The following further describes the present utility model in conjunction with the drawings and embodiments, wherein:

[0025] Figure 1 is a cross-sectional view of a compressor according to an embodiment of the present utility model;

[0026] Figure 2 is a schematic structural diagram of a rotor assembly according to an embodiment of the present utility model;

[0027] Figure 3 is an exploded view of a rotor assembly according to an embodiment of the present utility model;

[0028] Figure 4 is Figure 1 an enlarged view of part A in

[0029] Figure 5 is an assembly schematic diagram of a first end plate and a first balance weight according to an embodiment of the present utility model;

[0030] Figure 6 is a top view of a first balance weight according to an embodiment of the present utility model;

[0031] Figure 7 is an assembly schematic diagram of a first end plate and a rotor core according to an embodiment of the present utility model;

[0032] Figure 8 is a cross-sectional view of a first end plate according to an embodiment of the present utility model;

[0033] Figure 9 is a side view of a first balance weight according to an embodiment of the present utility model;

[0034] Figure 10 Schematic diagram of the corresponding relationship between the height of the oil liquid level and the height of the second retaining ring in an embodiment of the present utility model.

[0035] Reference numerals in the attached drawings:

[0036] Rotating component 1000; pump body component 1100; stator iron core 1200; mounting hole 1210; compressor 2000; housing 2100; inner cavity 2110; first gap 2200; second gap 2300; rotor iron core 100; shaft hole 110; flow-through hole 120; crankshaft 200; first balance weight 300; first connection hole 310; first retaining ring 400; first through hole 410; second retaining ring 500; first end plate 600; second connection hole 610; second fastener 700; second end plate 800; second balance weight 900. Specific embodiments

[0037] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation to the present utility model.

[0038] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as up and down, etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0039] In the description of the present utility model, if the first and second are described only for the purpose of distinguishing technical features, it should not be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence of the indicated technical features.

[0040] In the description of the present utility model, unless otherwise clearly defined, terms such as setting, installation, and connection should be understood in a broad sense. Those skilled in the art can reasonably determine the specific meanings of the above terms in the present utility model in combination with the specific content of the technical solution.

[0041] In the related art, the flow path of the refrigerant in the compressor is usually the flow-through hole in the rotor iron core and the gap between the rotor iron core and the stator iron core. The refrigerant will flow upward from bottom to top along the above path from the pump body component. At the same time, the oil used for lubrication will fall downward through the gap between the stator component and the compressor housing.

[0042] However, when the balance weight installed towards the pump body assembly rotates, a negative pressure is generated in the area on its moving trajectory, forming a negative pressure zone. The air in the through-flow holes and the gaps between the rotor core and the stator core will flow towards this negative pressure zone, thus triggering the reverse flow phenomenon of the refrigerant, which affects the normal flow of the refrigerant in the through-flow holes and the gaps between the rotor core and the stator core. Part of the refrigerant turns to flow upward through the gap between the stator assembly and the compressor housing, which further causes the oil to be difficult to fall downward through the gap between the stator assembly and the compressor housing, making it difficult to maintain a stable oil level in the compressor cavity, exacerbating the wear between the components of the compressor, and having a negative impact on the long-term stable operation of the compressor.

[0043] For this reason, some embodiments of the present utility model propose a rotor assembly 1000, which is applicable to a compressor 2000. Specifically, refer to Figures 1 to 10 the illustration of the rotor assembly 1000 as shown.

[0044] For convenience of description, in the following description, the example of the rotor assembly 1000 being installed in the inner cavity 2110 of the compressor 2000 is used for illustration. Refer to Figure 1 As shown, in the embodiment of the present utility model, the compressor 2000 includes a housing 2100, a stator core 1200, a pump body assembly 1100, and a rotor assembly 1000. An inner cavity 2110 is provided inside the housing 2100. In order to protect the stator core 1200, the pump body assembly 1100, and the rotor assembly 1000, the stator core 1200, the pump body assembly 1100, and the rotor assembly 1000 are all installed in the inner cavity 2110.

[0045] Among them, the pump body assembly 1100 is arranged at the bottom of the inner cavity 2110. The rotor assembly 1000 and the stator assembly are located above the pump body assembly 1100. The stator core 1200 of the stator assembly is provided with an installation hole 1210. The rotor assembly 1000 is rotatably arranged in the installation hole 1210, and there is a first gap 2200 between the rotor core 100 and the inner wall of the installation hole 1210, and there is a second gap 2300 between the stator core 1200 and the housing.

[0046] Specifically, refer to Figure 2 and Figure 3 As shown, in the embodiment of the present utility model, the rotor assembly 1000 includes a rotor core 100, a crankshaft 200, and a first balance weight 300. Among them, a shaft hole 110 and a through-flow hole 120 are provided in the central area of the rotor core 100. Along the radial direction of the rotor core 100, the through-flow hole 120 is located outside the shaft hole 110, and it penetrates the rotor core 100 along the axial direction of the rotor core 100. Therefore, the refrigerant can flow from bottom to top along the through-flow hole 120. One end of the crankshaft 200 passes through the shaft hole 110, and the other end is connected to the pump body assembly 1100.

[0047] Continue to refer toFigure 2 and Figure 3 As shown in Figure 3 , in the embodiment of the present utility model, a first retaining ring 400 and a second retaining ring 500 are provided on the end face of the rotor core 100 facing the pump body assembly 1100. The first retaining ring 400 and the second retaining ring 500 are two coaxial annular structures with different sizes. Based on this, in the radial direction of the rotor core 100, the first retaining ring 400 and the second retaining ring 500 are arranged at intervals in sequence along the direction away from the crankshaft 200, wherein the second retaining ring 500 is arranged outside the first retaining ring 400.

[0048] In one example, the first retaining ring 400 and the second retaining ring 500 are respectively provided with lugs, and the first retaining ring 400 and the second retaining ring 500 are respectively fixedly connected to the rotor core 100 through the lugs; in another example, the first retaining ring 400 and the second retaining ring 500 are respectively welded to the rotor core 100.

[0049] Referring to Figure 3 and Figure 4 As shown in Figure 4 , in the embodiment of the present utility model, the first retaining ring 400 and the second retaining ring 500 respectively protrude from the rotor core 100 towards the pump body assembly 1100. Specifically, the first retaining ring 400 encloses to form a first through hole 410, and the first through hole 410 is arranged opposite to and communicated with the flow through hole 120. The crankshaft 200 sequentially passes through the first through hole 410 and the shaft hole 110 from bottom to top. In this embodiment, an installation position suitable for accommodating the first balance weight 300 is defined between the first retaining ring 400 and the second retaining ring 500. Based on this, the first balance weight 300 is arranged between the first retaining ring 400 and the second retaining ring 500 and is connected to the rotor core 100.

[0050] Referring to Figure 4 As shown in Figure 4 , in the embodiment of the present utility model, in the radial direction of the rotor core 100, the first retaining ring 400 is located between the flow through hole 120 and the first balance weight 300, and the second retaining ring 500 is located between the first gap 2200 and the first balance weight 300. Therefore, the first retaining ring 400 and the second retaining ring 500 can respectively play a role of a barrier.

[0051] Specifically, when the first balance weight 300 rotates, the first retaining ring 400 can block the air in the flow through hole 120 from flowing to the area passed by the rotation of the first balance weight 300, and the second retaining ring 500 can block the air in the first gap 2200 from flowing to the area passed by the rotation of the first balance weight 300, thereby reducing the negative pressure generated during the rotation of the first balance weight 300. It not only reduces the influence of the negative pressure generated by the first balance weight 300 on the refrigerant flow in the flow through hole 120, but also reduces the influence of the negative pressure generated by the first balance weight 300 on the refrigerant flow in the gap between the rotor core 100 and the stator core 1200, so that the refrigerant in the flow through hole 120 and the first gap 2200 can be as Figure 1The oil in the first gap 2200 flows normally in the direction indicated by the dashed line, while the oil in the second gap 2300 can fall back normally in the direction indicated by the center dash line. Figure 1 The oil in the second gap 2300 can fall back normally in the direction indicated by the center dash line.

[0052] In the embodiment of the present utility model, the first retaining ring 400 is used to inhibit the reverse flow of air in the flow passage hole 120, thereby avoiding the negative pressure generated by the first balance weight 300 from hindering the normal flow of the refrigerant in the flow passage hole 120. The second retaining ring 500 is also used to inhibit the reverse flow of air in the first gap 2200, thereby avoiding the negative pressure generated by the first balance weight 300 from hindering the normal flow of the refrigerant in the first gap 2200. Furthermore, the occurrence of the reverse flow of the refrigerant in the flow passage hole 120 and the first gap 2200 is effectively inhibited, which helps the oil to fall back through the second gap 2300.

[0053] Referring to Figure 3 and Figure 4 As shown, in the embodiment of the present utility model, the rotor assembly 1000 further includes a first end plate 600. The first end plate 600 is integrally circular, and the first end plate 600 is coaxial with the shaft hole 110. The first end plate 600 is fixedly connected to the end face of the rotor core 100 facing the pump body assembly 1100. For example, the first end plate 600 and the rotor core 100 can be connected by fasteners, or can be connected by welding, or can be connected by other forms of connection. One end of the first end plate 600 is connected to the first retaining ring 400, and the other end is connected to the second retaining ring 500. The first balance weight 300 is fixedly connected to the end of the first end plate 600 facing away from the rotor core 100, so as to be indirectly connected to the rotor core 100.

[0054] Referring to Figure 4 and Figure 5 As shown, in the embodiment of the present utility model, the first end plate 600, the first retaining ring 400 and the second retaining ring 500 are integrally formed. For example, the first retaining ring 400 and the second retaining ring 500 can be made by stamping process. Specifically, the inner peripheral edge of the first end plate 600 is folded towards the pump body assembly 1100 to form the first retaining ring 400, and a first through hole 410 is formed by surrounding. The outer peripheral edge of the first end plate 600 is also folded towards the pump body assembly 1100 to form the second retaining ring 500. The first retaining ring 400 and the first end plate 600 are transitioned by a fillet, and the second retaining ring 500 and the first end plate 600 are transitioned by a fillet. In this embodiment, the heights of the first retaining ring 400 and the second retaining ring 500 along the axial direction of the rotor core 100 can be the same or different, and this embodiment does not limit this.

[0055] Referring to Figure 5 and Figure 6As shown, in the embodiment of the present utility model, along the axial direction of the rotor core 100, the cross-section of the first balance block 300 is arc-shaped, and the first balance block 300 extends along the first end plate 600 in a curved manner. Based on this, the first balance block 300 is coaxially arranged with the rotor core 100.

[0056] It can be understood that in the embodiment of the present utility model, on the projection plane perpendicular to the axial direction of the rotor core 100, the projection of the first balance block 300 is within the projection of the outer peripheral wall of the rotor core 100. Specifically, the first balance block 300 is installed on the rotor core 100 through the first end plate 600. Based on this, in order to ensure that the rotor core 100 can provide sufficient supporting force for the first balance block 300, referring to Figure 6 As shown, in this embodiment, the maximum distance between the outer peripheral edge of the first balance block 300 and the axis of the shaft hole 110 is L1; referring to Figure 7 As shown, the maximum outer diameter of the rotor core 100 is R1, and it satisfies: R1 > L1, thereby avoiding the first balance block 300 protruding radially from the rotor core 100, and improving the stability of the first balance block 300.

[0057] In the embodiment of the present utility model, the rotor assembly 1000 further includes a first fastener (not shown in the figure). The first fastener sequentially passes through the first balance block 300 and the first end plate 600, and is fixedly connected to the rotor core 100. Specifically, referring to Figure 5 As shown, the first balance block 300 is provided with a first connection hole 310, the first end plate 600 is provided with a second connection hole 610, and the rotor core 100 is provided with a third connection hole (not shown in the figure). The first connection hole 310, the second connection hole 610, and the third connection hole are mutually communicated, and the first fastener passes through the first connection hole 310, the second connection hole 610, and the third connection hole.

[0058] In one example, the first fastener is a screw, and the third connection hole is a screw hole that can be threadedly engaged with the screw. Based on this, the first fastener can sequentially pass through the first connection hole 310 and the second connection hole 610, and be engaged with the third connection hole to achieve a fastening connection in a threaded connection manner. It should be noted that the first fastener is not limited to a screw, and can also be a rivet, etc. This embodiment does not make a limitation in this regard.

[0059] Referring to Figure 6 As shown, in the embodiment of the present utility model, the minimum distance between the inner peripheral edge of the first balance block 300 and the axis of the shaft hole 110 is L2. Referring to Figure 7As shown, in the embodiment of the present utility model, the outer diameter of the first retaining ring 400 is R3, and the inner diameter of the second retaining ring 500 is R4, satisfying: R4 - R3 > L1 - L2. It can be understood that R4 - R3 represents the minimum distance between the first retaining ring 400 and the second retaining ring 500, and L1 - L2 represents the maximum width of the first balance weight 300. To ensure that the space between the first retaining ring 400 and the second retaining ring 500 can accommodate the first balance weight 300, in this embodiment, the minimum distance between the first retaining ring 400 and the second retaining ring 500 is greater than the maximum width of the first balance weight 300.

[0060] Refer to Figure 7 and Figure 8 As shown, in the embodiment of the present utility model, the first through hole 410 is a circular hole, the first through hole 410 is coaxially arranged with the shaft hole 110, and the aperture of the first through hole 410 is R5. Along the axial direction of the rotor core 100, the height of the first retaining ring 400 is H1, and the height of the second retaining ring 500 is H2. It can be understood that during the experiment, the inventor learned that if the heights of the first retaining ring 400 and the second retaining ring 500 along the axial direction of the rotor core 100 are too high, the first retaining ring 400 and the second retaining ring 500 will be too close to the pump body assembly 1100, thereby increasing the possibility of interference between the first retaining ring 400 and the second retaining ring 500 and the pump body assembly 1100. In addition, it will also make it difficult for the refrigerant to pass through the gap between the first retaining ring 400 and the pump body assembly 1100 and enter the flow-through hole 120; on the contrary, if the heights of the first retaining ring 400 and the second retaining ring 500 along the axial direction of the rotor core 100 are too low, the first retaining ring 400 and the second retaining ring 500 will not be able to block the air flow to the negative pressure area.

[0061] Therefore, in the embodiment of the present utility model, the first retaining ring 400 and the second retaining ring 500 satisfy: 2 mm (millimeters) ≤ H1 ≤ R5, 2 mm (millimeters) ≤ H2 ≤ R5, so as to ensure that there is enough gap between the first retaining ring 400 and the second retaining ring 500 and the pump body assembly 1100, reducing the risk of interference between the first retaining ring 400 and the second retaining ring 500 and the pump body assembly 1100, enabling the refrigerant to flow smoothly from between the first retaining ring 400 and the pump body assembly 1100 and enter the flow-through hole 120, and at the same time ensuring that the first retaining ring 400 and the second retaining ring 500 can fully play the role of a barrier, effectively blocking the air flow in the flow-through hole 120 and the first gap 2200 to the negative pressure area.

[0062] Refer to Figure 9As shown, in the embodiment of the present utility model, along the axial direction of the rotor core 100, the height of the first balance weight 300 is H3. It can be understood that during the test, the inventor learned that if the heights of the first retaining ring 400 and the second retaining ring 500 relative to the first balance weight 300 are too high, the first retaining ring 400 and the second retaining ring 500 will be too close to the pump body assembly 1100, thereby increasing the possibility of interference between the first retaining ring 400 and the second retaining ring 500 and the pump body assembly 1100. In addition, it will also make it difficult for the refrigerant to pass through the gap between the first retaining ring 400 and the pump body assembly 1100 and enter the flow passage hole 120; conversely, if the heights of the first retaining ring 400 and the second retaining ring 500 relative to the first balance weight 300 are too low, the air in the flow passage hole 120 and the first gap 2200 is likely to bypass the first retaining ring 400 and the second retaining ring 500 and enter the negative pressure area.

[0063] Therefore, in the embodiment of the present utility model, the first retaining ring 400 and the second retaining ring 500 satisfy: 0.2H3 ≤ H1 ≤ 3H3, 0.2H3 ≤ H2 ≤ 3H3, so as to ensure that there is enough gap between the first retaining ring 400 and the second retaining ring 500 and the pump body assembly 1100 for the refrigerant to pass through smoothly and flow into the flow passage hole 120, reducing the risk of interference between the first retaining ring 400 and the second retaining ring 500 and the pump body assembly 1100, and also ensuring that the first retaining ring 400 and the second retaining ring 500 can reduce the possibility that the air in the flow passage hole 120 and the first gap 2200 easily bypasses the first retaining ring 400 and the second retaining ring 500 and enters the negative pressure area, effectively blocking the air flow in the flow passage hole 120 and the first gap 2200 from flowing to the negative pressure area.

[0064] Refer to Figure 7 As shown, in the embodiment of the present utility model, along the axial direction of the rotor core 100, the cross-section of the second retaining ring 500 is circular, and the second retaining ring 500 is coaxially arranged with the shaft hole 110, wherein the outer diameter of the second retaining ring 500 is R2. It can be understood that during the test, the inventor learned that if the outer diameter of the second retaining ring 500 is too large, the second retaining ring 500 will protrude radially from the rotor core 100 along the rotor core 100; conversely, if the outer diameter of the second retaining ring 500 is too small, the air in the first gap 2200 is likely to bypass the second retaining ring 500 and enter the negative pressure area.

[0065] Therefore, in the embodiment of the present utility model, the second retaining ring 500 satisfies: 0.9R1 ≤ R2 ≤ R1. The following takes the value of R1 as R for illustration: It should be noted that Figure 10 The abscissa in is the value of R2. Based on this, combined with Figure 10It can be understood that when the value of R2 decreases from 0.9R to 0.85R, the height of the oil level will drop sharply, indicating that when the value of R2 is less than 0.9R, the second retaining ring 500 is difficult to block the air flow in the first gap 2200 from flowing to the negative pressure area, resulting in the occurrence of refrigerant backflow. As a result, the oil in the second gap 2300 is difficult to fall back, causing the oil level to be relatively low. Therefore, the second retaining ring 500 in this embodiment satisfies: 0.9R1 ≤ R2 ≤ R1, ensuring that the distance between the second retaining ring 500 and the first gap 2200 in the radial direction of the rotor core 100 is relatively small, and ensuring that the second retaining ring 500 can effectively block the air flow in the first gap 2200 from flowing to the negative pressure area.

[0066] Referring to Figure 2 As shown, in the embodiment of the present utility model, there are multiple flow-through holes 120, and the multiple flow-through holes 120 are arranged at intervals along the circumferential direction of the shaft hole 110 to ensure that the refrigerant can flow smoothly. The first through hole 410 is disposed opposite to the multiple flow-through holes 120. Based on this, the refrigerant can flow through the first through hole 410 and the flow-through holes 120 in sequence. To ensure that the second end plate 800 does not block the refrigerant from flowing into the flow-through holes 120, in this embodiment, the sum of the projected areas of all the flow-through holes 120 is S, satisfying: πR5 2 ≥ 0.5S, that is, in the axial direction of the rotor core 100, the projected area of the first through hole 410 is greater than or equal to 0.5 times the sum of the projected areas of all the flow-through holes 120.

[0067] Referring to Figure 2 and Figure 3 As shown, in the embodiment of the present utility model, the rotor assembly 1000 further includes a second end plate 800 and a second balance weight 900. Among them, the second end plate 800 is integrally annular and is coaxial with the shaft hole 110. The second end plate 800 is fixedly connected to the end face of the rotor core 100 facing away from the pump body assembly 1100. For example, the second end plate 800 and the rotor core 100 can be connected by fasteners, can also be connected by welding, or can be connected by other forms of connection. The second balance weight 900 is fixedly connected to one end of the second end plate 800 facing away from the rotor core 100, so as to be indirectly connected to the rotor core 100. In one example, the rotor assembly 1000 further includes a second fastener 700, and the second fastener 700 sequentially passes through the second balance weight 900 and the second end plate 800 and is fixedly connected to the rotor core 100.

[0068] Referring to Figure 1As shown in the figure, an embodiment of the present utility model further provides a compressor 2000, which includes a housing 2100, a stator core 1200, a pump body assembly 1100, and the rotor assembly 1000 of the above embodiment. The housing 2100 is provided with an inner cavity 2110. The stator core 1200, the pump body assembly 1100, and the rotor assembly 1000 are arranged in the inner cavity 2110. The rotor core 100 is rotatably arranged in the mounting hole 1210 of the stator core 1200, and the crankshaft 200 is rotatably arranged in the pump body assembly 1100.

[0069] The compressor 2000 of the embodiment of the present utility model adopts the rotor assembly 1000 of the above embodiment. By providing a first retaining ring 400 and a second retaining ring 500, and installing the first balance weight 300 between the first retaining ring 400 and the second retaining ring 500, the first retaining ring 400 blocks the air flow in the through-flow hole 120 to the area passed by the rotation of the first balance weight 300, and the second retaining ring 500 blocks the air flow in the first gap 2200 to the area passed by the rotation of the first balance weight 300, thereby reducing the negative pressure generated during the rotation of the first balance weight 300. This not only avoids the negative pressure generated by the first balance weight 300 from hindering the normal circulation of the refrigerant in the through-flow hole 120, but also avoids the negative pressure generated by the first balance weight 300 from hindering the normal circulation of the refrigerant in the first gap 2200. Furthermore, it effectively suppresses the occurrence of refrigerant backflow in the through-flow hole 120 and the first gap 2200, helps the oil to fall back in the second gap 2300, improves the stability of the oil level in the inner cavity 2110 of the compressor 2000, thereby reducing the wear of the compressor 2000 and extending the service life of the compressor 2000.

[0070] Since the compressor 2000 adopts all the technical solutions of the rotor assembly 1000 of the above embodiment, it at least has all the beneficial effects brought by the technical solutions of the above embodiment, which will not be elaborated here.

[0071] An embodiment of the present utility model further provides a refrigeration device, which includes the compressor 2000 of the above embodiment. In this embodiment, the refrigeration device can be a refrigerator or an air conditioner, etc., and this embodiment does not make any limitations in this regard.

[0072] The refrigeration device of the embodiment of the present utility model adopts the compressor 2000 of the above embodiment. By suppressing the occurrence of refrigerant backflow in the through-flow hole 120 and the gap between the rotor core 100 and the stator core 1200, the oil can more easily fall back in the gap between the stator assembly and the housing of the compressor 2000. Furthermore, it improves the stability of the oil level in the inner cavity 2110 of the compressor 2000, reduces the wear of the compressor 2000, improves the operating stability of the refrigeration device, and extends the service life of the refrigeration device.

[0073] Since the refrigeration equipment adopts all the technical solutions of the compressor 2000 in the above embodiment, it at least has all the beneficial effects brought by the technical solutions of the above embodiment, which will not be elaborated here.

[0074] Of course, the present utility model is not limited to the above embodiments. Those skilled in the art can make equivalent deformations or substitutions without departing from the spirit of the present utility model, and these equivalent variations or substitutions are all included in the scope defined by the claims of this application.

Claims

1. Rotor assembly, characterized in that, Comprising: A rotor core, provided with an axially spaced shaft hole and a current-carrying hole, the current-carrying hole axially penetrating the rotor core along the axial direction of the rotor core; A crankshaft, one end of which is inserted into the shaft hole and the other end is used for connecting with a pump body assembly; A first balance weight, arranged at one end of the rotor core facing the pump body assembly; Wherein, one end of the rotor core facing the pump body assembly is provided with a first retaining ring and a second retaining ring. In the radial direction of the rotor core, the second retaining ring is arranged outside the first retaining ring and is spaced from the first retaining ring. A first through hole for the crankshaft to pass through and communicate with the current-carrying hole is formed inside the first retaining ring, and the first balance weight is installed between the first retaining ring and the second retaining ring.

2. The rotor assembly according to claim 1, characterized in that The rotor assembly further includes a first end plate, which is fixedly arranged on the end face of the rotor core facing the pump body assembly and is arranged along the circumferential direction of the rotor core. In the radial direction of the rotor core, one end of the first end plate is connected to the first retaining ring and the other end is connected to the second retaining ring. The first balance weight is connected to the end of the first end plate facing away from the rotor core.

3. The rotor assembly according to claim 2, characterized in that, On a projection plane perpendicular to the axial direction of the rotor core, the projection of the first balance weight is within the projection of the outer peripheral wall of the rotor core.

4. The rotor assembly according to claim 2, wherein The rotor assembly further includes a first fastener, which penetrates through the first balance weight and the first end plate and is fixedly connected to the rotor core.

5. The rotor assembly according to claim 1, characterized in that, In the radial direction of the rotor core, the minimum distance between the first retaining ring and the second retaining ring is greater than the maximum width of the first balance weight.

6. The rotor assembly according to claim 1, wherein, The first through hole is a circular hole, the aperture of the first through hole is R5. Along the axial direction of the rotor core, the height of the first retaining ring is H1, satisfying: 2mm ≤ H1 ≤ R5, and the height of the second retaining ring is H2, satisfying: 2mm ≤ H2 ≤ R5.

7. The rotor assembly according to claim 1 or 6, characterized in that, Along the axial direction of the rotor core, the height of the first balance weight is H3, and the height of the first retaining ring is H1, satisfying: 0.2H3 ≤ H1 ≤ 3H3, and the height of the second retaining ring is H2, satisfying: 0.2H3 ≤ H2 ≤ 3H3.

8. The rotor assembly according to claim 1 or 6, characterized in that, The second retaining ring is circular. In the radial direction of the rotor core, the maximum outer diameter of the rotor core is R1, and the outer diameter of the second retaining ring is R2, satisfying: 0.9R1 ≤ R2 ≤ R1.

9. The rotor assembly according to claim 1, wherein, There are multiple current-carrying holes, and the multiple current-carrying holes are circumferentially spaced along the shaft hole. In the axial direction of the rotor core, at least part of the projection of the first through hole covers the projection of the multiple current-carrying holes, and the projection area of the first through hole is greater than or equal to 0.5 times the sum of the projection areas of all the current-carrying holes.

10. The rotor assembly according to claim 1, wherein, The rotor assembly further includes a second end plate and a second balance weight. The second end plate is fixedly arranged on the end face of the rotor core facing away from the pump body assembly, and the second balance weight is connected to the end of the second end plate facing away from the rotor core.

11. Compressor, characterized in that, It includes a housing, a stator core, a pump body assembly, and a rotor assembly as described in any one of claims 1 to 10. The stator core, the pump body assembly, and the rotor assembly are installed in the housing. The rotor core is rotatably arranged in the stator core, and the crankshaft is rotatably arranged in the pump body assembly.

12. Refrigeration equipment, characterized in that, It includes a compressor as described in claim 11.

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