Balance, rotor assembly, electric machine, compressor and refrigeration appliance

Abstract

The application discloses a balance block, a rotor assembly, a motor, a compressor and a refrigeration device. The balance block comprises a balance part and a support arm. The windward end and the leeward end of the balance part are respectively provided with the support arms. The ends of the support arms arranged at the windward end and the leeward end of the balance part respectively are arranged alternately away from the balance part. The balance part is suitable for being connected with a rotor core, and the support arm is suitable for being connected with the rotor core. The technical scheme of the application improves the structure of the balance block, and sets the balance part and the support arm. When the balance block is connected with the rotor core, the force receiving area between the balance block and the rotor core can be increased, the deformation of the rotor core can be improved, and the noise can be reduced.

Description

Technical Field

[0001] This application relates to the field of compressor technology, and more particularly to a balance block, rotor assembly, motor, compressor and refrigeration equipment. Background Technology

[0002] The compressor rotor core is equipped with a counterweight to balance the unbalanced force brought by the crankshaft. The counterweight and the rotor core are usually connected together. However, the fastening force generated by the connection between the counterweight and the rotor core can easily deform the rotor core. Deformation of the rotor core can worsen the axial solid-frequency resonance of the rotor, generate abnormal noise, and affect the product experience. Summary of the Invention

[0003] This application aims to at least partially solve one of the technical problems in the related art. To this end, this application proposes a balance block, a rotor assembly, a motor, a compressor, and a refrigeration device.

[0004] To achieve the above objectives, the first aspect of this application discloses a balance block, which includes a balance part and a support arm. The support arm is provided at the windward end and the leeward end of the balance part, and the support arm provided at the windward end of the balance part and the support arm provided at the leeward end of the balance part are arranged alternately at one end away from the balance part. The balance part is adapted to be connected to the rotor core, and the support arm is adapted to be connected to the rotor core.

[0005] In some embodiments of this application, the balancing part and the support arm are integrally formed; And / or, the balance block is composed of multiple plates stacked and connected together.

[0006] In some embodiments of this application, the support arm extends circumferentially along the rotor core.

[0007] In some embodiments of this application, at least one of the inner and outer surfaces of the support arm and the balancing portion form a concave space.

[0008] In some embodiments of this application, the maximum thickness of the support arm is less than the minimum thickness of the balancing portion along the radial direction of the rotor core.

[0009] In some embodiments of this application, a concave space is formed between the outer surface of the support arm and the balancing part, and the inner surface of the support arm and the inner surface of the balancing part transition smoothly.

[0010] In some embodiments of this application, the minimum distance between the center of mass of the balance block and the balance part is less than the minimum distance between the center of mass of the balance block and the support arm.

[0011] In some embodiments of this application, the balancing part is provided with a first connecting hole, and the balancing part is adapted to be connected to the rotor core through the first connecting hole; the support arm is provided with a second connecting hole, and the support arm is adapted to be connected to the rotor core through the second connecting hole.

[0012] In some embodiments of this application, the support arm includes a support rib and a support platform, the support platform being disposed at one end of the support rib away from the balance part, and the support platform being provided with the second connecting hole.

[0013] In some embodiments of this application, the thickness of the support rib along the radial direction of the rotor core is T, and the outer diameter of the support platform is D, satisfying 0mm≤DT≤5mm.

[0014] In some embodiments of this application, the mass of the balance block is M, the radius of its center of mass is R, the axial height is H, and the minimum wall thickness of the support platform is t, satisfying t≥5.4. M R / H.

[0015] In some embodiments of this application, along the axial direction of the rotor core, the projected area of ​​the solid portion of the support platform is s, and the projected area of ​​the second connecting hole is e, satisfying s / e≥2.

[0016] The second aspect of this application discloses a rotor assembly, which includes a rotor core and the aforementioned balance blocks, wherein the balance blocks are respectively provided on both axial sides of the rotor core.

[0017] In some embodiments of this application, the rotor assembly includes a connector that passes through and is fastened to counterweights on both axial sides of the rotor core.

[0018] A third aspect of this application discloses an electric motor comprising the rotor assembly described above.

[0019] The fourth aspect of this application discloses a compressor that includes the aforementioned motor.

[0020] The fifth aspect of this application discloses a refrigeration device, which includes the compressor described above.

[0021] The technical solution of this application modifies the structure of the balance block. Based on the setting of the balance part and the support arm, when the balance block and the rotor core are connected, the force-bearing area between the balance block and the rotor core can be increased, the deformation of the rotor core can be improved, and the noise can be reduced.

[0022] Other advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description or may be learned by practice of this application. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other designs can be obtained based on the structures shown in these drawings without creative effort, wherein: Figure 1 Cross-sectional views of the rotor assembly in some embodiments; Figure 2 This is a schematic diagram of the balance block in some embodiments; Figure 3 for Figure 2 Top view of the balance block shown; Figure 4 This is a schematic diagram of another balance block in some embodiments; Figure 5 for Figure 4 Top view of the balance block shown; Figure 6 This is a schematic diagram of a partial structure of the support arm in some embodiments.

[0024] Figure label: Balance block 100, first balance block 101, second balance block 102, balance part 110, windward end 111, leeward end 112, support arm 120, support rib 121, support platform 122, concave corner space 130, first connecting hole 141, second connecting hole 142, rotor core 200.

[0025] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0026] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0027] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, features defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0028] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0029] The first aspect of this application discloses a balance block 100, which, in some embodiments, is combined with Figures 1 to 5 As shown, the balance block 100 includes a balance part 110 and a support arm 120. The windward end 111 and the leeward end 112 of the balance part 110 are respectively provided with support arms 120. The support arm 120 provided at the windward end 111 and the support arm 120 provided at the leeward end 112 of the balance part 110 are arranged alternately with one end away from the balance part 110. The balance part 110 is adapted to be connected to the rotor core 200, and the support arm 120 is adapted to be connected to the rotor core 200.

[0030] By modifying the structure of the balance block 100, based on the balance part 110 and the support arm 120, when the balance block 100 and the rotor core 200 are connected, the force-bearing area between the balance block 100 and the rotor core 200 can be increased, the deformation of the rotor core 200 can be improved, and the noise can be reduced.

[0031] The compressor, in conjunction with the balance block 100, comprises a motor and a pump body. The pump body compresses the refrigerant, transforming low-temperature, low-pressure refrigerant into high-temperature, high-pressure refrigerant. The pump body includes a crankshaft, which connects to the motor. The motor comprises a stator assembly and a rotor assembly, which cooperate with each other. Typically, the rotor assembly is rotatably located inside the stator assembly, meaning the stator assembly surrounds the rotor assembly. The rotor assembly is fitted onto and fixed to the crankshaft. When the rotor assembly rotates, it drives the crankshaft to rotate, thereby compressing the refrigerant through the pump body.

[0032] It is understandable that the crankshaft has an eccentric structure. When the crankshaft rotates, its eccentric structure undergoes eccentric motion. In order to keep the rotor assembly dynamic balanced, the rotor assembly has a balance block 100. The balance block 100 cancels out the unbalanced force, which can reduce the vibration of the whole machine, reduce the bearing load, avoid bearing wear, and improve the reliability of the compressor.

[0033] The rotor assembly typically includes a rotor core 200, and a counterweight 100 needs to be connected to the rotor core 200 for mutual fixation. The inventors have discovered that when the counterweight and the rotor core are connected in the prior art, the fastening force between the counterweight and the rotor core can easily cause the rotor core to deform. When the rotor core is deformed, the rotor axial solid-frequency resonance is easily deteriorated, resulting in abnormal noise, especially with the risk of the noise peak reaching 500Hz.

[0034] Therefore, in this embodiment, the balance block 100 includes a balance part 110 and a support arm 120. The windward end 111 and the leeward end 112 of the balance part 110 are respectively provided with support arms 120. The support arm 120 provided at the windward end 111 and the support arm 120 provided at the leeward end 112 of the balance part 110 are arranged alternately with one end away from the balance part 110. The balance part 110 is connected to the rotor core 200, and the support arm 120 is also connected to the rotor core 200. In this way, the force-bearing area between the balance block 100 and the rotor core 200 can be increased, the deformation of the rotor core 200 can be improved, and noise can be reduced.

[0035] For example, see Figure 2 and Figure 3 As shown, the balancing section 110 is roughly fan-shaped. Along the circumference of the rotor core 200 (the circumference of the rotor core can be understood as the circumference of the rotor assembly), one end of the balancing section 110 forms the windward end 111, and the other end of the balancing section 110 forms the leeward end 112. The windward end 111 and the leeward end 112 of the balancing section 110 can be understood as follows: when the rotor assembly rotates, the windward end 111 of the balancing section 110 "runs in front" and is the first to collide with the mixture of refrigerant and oil, while the leeward end 112 of the balancing section 110 "lags behind" and forms one end of the mixture of refrigerant and oil that leaves the balancing block 100.

[0036] Support arms 120 are respectively provided at the windward end 111 and the leeward end 112 of the balancing section 110. The support arms 120 at the windward end 111 and the leeward end 112 are arranged alternately with one end facing away from the balancing section 110. When the balancing block 100 and the rotor core 200 are connected, the balancing section 110 is connected to the rotor core 200, thus generating a fastening force between the balancing section 110 and the rotor core 200. Similarly, the support arms 120 are connected to the rotor core 200, thus generating a fastening force between the support arms 120 and the rotor core 200, ensuring a stable connection between the balancing block 100 and the rotor core 200. The connection methods between the balancing section 110 and the rotor core 200, and between the support arms 120 and the rotor core 200, include, but are not limited to, riveting and bolting.

[0037] The balancing part 110 in this embodiment is equivalent to the balancing block in the prior art, with the addition of a support arm 120. In this way, when connecting the balancing block 100 and the rotor core 200, the force-bearing area between the balancing block 100 and the rotor core 200 is increased. Under the premise that the total fastening force applied to the connection between the balancing block 100 and the rotor core 200 is constant, the pressure on the rotor core 200 will be reduced. This can improve the deformation of the rotor core 200, thereby improving the fixed frequency of the rotor assembly and reducing 500Hz noise.

[0038] Optionally, the support arm 120 extends circumferentially along the rotor core 200. Specifically, the support arm 120 located at the windward end 111 extends circumferentially from and away from the windward end 111 along the rotor core 200, and the support arm 120 located at the leeward end 112 extends circumferentially from and away from the leeward end 112 along the rotor core 200. This makes the entire balance block 100 have a C-shaped structure, and the outer contour of the balance block 100 better conforms to the shape of the rotor core 200. The C-shaped structure means that any plane passing through the rotation axis of the balance block 100 (which is also the rotation axis of the rotor core 200, and thus the rotation axis of the rotor assembly) intersects the balance block 100.

[0039] In some embodiments, combined with Figures 2 to 5 As shown, at least one of the inner and outer surfaces of the support arm 120 and the balance portion 110 form a concave space 130.

[0040] The inner surface is the side facing the rotation axis of the balance block 100, and the outer surface is the side facing away from the rotation axis of the balance block 100. At least one of the inner and outer surfaces of the support arm 120 forms a concave angle space 130 with the balance part 110. The concave angle space 130 can be formed between the inner surface of the support arm 120 and the balance part 110, or between the outer surface of the support arm 120 and the balance part 110, or between the inner and outer surfaces of the support arm 120 and the balance part 110 respectively.

[0041] The balance block 100 mainly plays a dynamic balancing role through the balance part 110, while the support arm 120 is mainly used to cooperate with the balance part 110 to increase the force-bearing area between the balance block 100 and the rotor core 200. The setting of the concave corner space 130 avoids the support arm 120 from being too heavy and affecting the dynamic balancing role of the balance block 100. At the same time, it also takes into account the material usage of the balance block 100, thus taking into account the cost.

[0042] In some embodiments, combined with Figures 2 to 5 As shown, along the radial direction of the rotor core 200, the maximum thickness of the support arm 120 is less than the minimum thickness of the balancing portion 110. The radial direction of the rotor core can be understood as the radial direction of the rotor assembly. Because the maximum thickness of the support arm 120 is less than the minimum thickness of the balancing portion 110, the concave space 130 extends from the balancing portion 110 and away from the balancing portion 110 along at least one of the inner and outer surfaces of the support arm 120.

[0043] For example, when a concave space 130 is formed between the inner surface of the support arm 120 and the balancing portion 110, the concave space 130 extends from the balancing portion 110 and along the inner surface of the support arm 120 away from the balancing portion 110.

[0044] For example, when a concave space 130 is formed between the outer surface of the support arm 120 and the balancing portion 110, the concave space 130 extends from the balancing portion 110 and along the outer surface of the support arm 120 away from the balancing portion 110.

[0045] For example, when concave corner spaces 130 are formed between the inner and outer surfaces of the support arm 120 and the balancing portion 110, the inner concave corner space 130 extends from the balancing portion 110 and along the inner surface of the support arm 120 away from the balancing portion 110, and the outer concave corner space 130 extends from the balancing portion 110 and along the outer surface of the support arm 120 away from the balancing portion 110.

[0046] By ensuring that the maximum thickness of the support arm 120 is less than the minimum thickness of the balancing part 110 along the radial direction of the rotor core 200, the support arm 120 can achieve a balance between load-bearing area, dynamic balancing effect, and cost with only a relatively small mass.

[0047] In some embodiments, combined with Figures 2 to 5 As shown, a concave space 130 is formed between the outer surface of the support arm 120 and the balance part 110, and the inner surface of the support arm 120 and the inner surface of the balance part 110 are smoothly transitioned.

[0048] Since the balance block 100 mainly plays a dynamic balancing role through the balance part 110, while the support arm 120 is mainly used to cooperate with the balance part 110 to increase the force-bearing area between the balance block 100 and the rotor core 200, the concave corner space 130 is set between the outer surface of the support arm 120 and the balance part 110, and the inner surface of the support arm 120 and the inner surface of the balance part 110 are smoothly transitioned. In this way, the distance between the rotation axis of the support arm 120 and the balance block 100 can be reduced, the influence of the support arm 120 on the dynamic balancing effect of the balance part 110 can be reduced, thereby reducing the dynamic balancing design difficulty of the entire balance block 100.

[0049] In some embodiments, the minimum distance between the center of mass of the balance block 100 and the balance part 110 is less than the minimum distance between the center of mass of the balance block 100 and the support arm 120.

[0050] The center of mass of the balance block 100 is its centroid. If the center of mass of the balance block 100 is biased toward the support arm 120, the support arm 120 will have a significant impact on the dynamic balance effect of the balance block 100. Since the balance block 100 mainly plays a dynamic balancing role through the balancing part 110, while the support arm 120 is mainly used to cooperate with the balancing part 110 to increase the force-bearing area between the balance block 100 and the rotor core 200, the minimum distance between the center of mass of the balance block 100 and the balancing part 110 is less than the minimum distance between the center of mass of the balance block 100 and the support arm 120. In this way, the center of mass of the balance block 100 is biased toward the balancing part 110, which can suppress the influence of the support arm 120 on the dynamic balance effect and further reduce the dynamic balance design difficulty of the entire balance block 100.

[0051] In some embodiments, combined with Figures 2 to 5 As shown, the balancing part 110 is provided with a first connecting hole 141, and the balancing part 110 is adapted to be connected to the rotor core 200 through the first connecting hole 141. The support arm 120 is provided with a second connecting hole 142, and the support arm 120 is adapted to be connected to the rotor core 200 through the second connecting hole 142. The balancing part 110 is conveniently connected to the rotor core 200 by providing the first connecting hole 141, and the support arm 120 is conveniently connected to the rotor core 200 by providing the second connecting hole 142.

[0052] For example, the rotor assembly includes connectors. The rotor core 200 has corresponding connecting holes for the first connecting hole 141 and the second connecting hole 142. One connector passes through the first connecting hole 141 and the corresponding connecting hole of the rotor core 200, and another connector passes through the second connecting hole 142 and the corresponding connecting hole of the rotor core 200. Through the action of the connectors, the balance block 100 and the rotor core 200 can be fastened together. Optionally, the connectors include, but are not limited to, rivets, bolts, etc.

[0053] There are multiple first connecting holes 141 and multiple second connecting holes 142. Multiple means two or more, which can be two, three, four, five or other quantities.

[0054] In some embodiments, combined with Figures 2 to 5 As shown, the support arm 120 includes a support rib 121 and a support platform 122. The support platform 122 is located at one end of the support rib 121 away from the balance part 110, and the support platform 122 is provided with a second connecting hole 142.

[0055] Since the support arm 120 extends from and away from the balance part 110, if the connection of the support arm 120 is not firm, the support arm 120 is prone to slight swaying during rotation, which may cause the connection between the support arm 120 and the balance part 110 to break. Therefore, in this embodiment, the support platform 122 is located at the end of the support rib 121 away from the balance part 110, so that the support platform 122 constitutes the distal structure of the support arm 120. By providing the second connection hole 142 in the support platform 122, the connection stability of the distal end of the support arm 120 can be enhanced, and the risk of breakage between the support arm 120 and the balance part 110 can be reduced.

[0056] Optionally, given that a second connecting hole 142 is provided on the support platform 122, a second connecting hole 142 can also be provided on the support rib 121 to further improve the stability of the connection.

[0057] In some embodiments, combined with Figures 2 to 5 As shown, the thickness of the support rib 121 along the radial direction of the rotor core 200 is T, and the outer diameter of the support platform 122 is D, satisfying 0mm≤DT≤5mm.

[0058] As can be seen from the above, the support platform 122 needs a second connecting hole 142 to connect with the rotor core 200. The second connecting hole 142 is used for the connecting parts to pass through. By satisfying the aforementioned conditions, while taking into account the weight, the outer diameter of the support platform 122 is appropriately increased to ensure the contact between the support platform 122 and the connecting parts and improve the stability of the connection.

[0059] In some embodiments, combined with Figures 2 to 5As shown, the mass of the balance block 100 is M, the radius of its center of mass is R, and its axial height is H. The minimum wall thickness of the support platform 122 is t, which satisfies t ≥ 5.4. M R / H.

[0060] The axial height H is the maximum height measured along the axial direction of the rotor core, which can be understood as the axial direction of the rotor assembly. In this embodiment, the support platform 122 requires a second connecting hole 142 to connect with the rotor core 200. The second connecting hole 142 is used for the connecting component to pass through. By satisfying the aforementioned conditions, the contact between the support platform 122 and the connecting component can be ensured while taking into account weight considerations, thereby improving the stability of the connection.

[0061] In some embodiments, combined with Figures 2 to 6 As shown, along the axial direction of the rotor core 200, the projected area of ​​the solid portion of the support platform 122 is s, and the projected area of ​​the second connecting hole 142 is e, satisfying s / e≥2. In this embodiment, the support platform 122 needs the second connecting hole 142 to connect with the rotor core 200. The second connecting hole 142 is used for the connecting component to pass through. By satisfying the aforementioned conditions, the contact between the support platform 122 and the connecting component can be ensured while taking into account weight considerations, thus improving the stability of the connection.

[0062] In some embodiments, the balancing part 110 and the support arm 120 are integrally formed, thereby enhancing the connection strength between the balancing part 110 and the support arm 120 and effectively preventing breakage between the balancing part 110 and the support arm 120.

[0063] In some embodiments, the balance block 100 is formed by stacking and connecting multiple plates. The plates can be steel plates, such as SPCC or SPHC, which helps reduce material costs and the size of the balance block 100. Of course, other materials can also be used. "Multiple plates" means two or more plates, and can be two, three, four, or other quantities. Each plate includes a portion corresponding to the balancing part 110 and a portion corresponding to the support arm 120. Stacking and connecting multiple plates to form the balance block 100 is a mature process; for example, multiple plates can be punched and riveted together. The number of plates can be set according to actual needs, making production more flexible and effectively reducing production costs.

[0064] The second aspect of this application discloses a rotor assembly. In some embodiments, the rotor assembly includes a rotor core 200 and the aforementioned balance block 100. The balance block 100 includes a balance portion 110 and a support arm 120. The windward end 111 and the leeward end 112 of the balance portion 110 are respectively provided with the support arm 120. The support arm 120 provided at the windward end 111 of the balance portion 110 and the support arm 120 provided at the leeward end 112 of the balance portion 110 are respectively arranged alternately with one end away from the balance portion 110. The balance portion 110 is adapted to be connected to the rotor core 200, and the support arm 120 is adapted to be connected to the rotor core 200.

[0065] By modifying the structure of the balance block 100, based on the balancing part 110 and the support arm 120, the force-bearing area between the balance block 100 and the rotor core 200 can be increased when the balance block 100 and the rotor core 200 are connected, thereby improving the deformation of the rotor core 200 and reducing noise. The balance block 100 of the rotor assembly in this embodiment adopts the technical solution of the above embodiment, and therefore has at least the beneficial effects brought by the technical solution of the above embodiment, which will not be repeated here.

[0066] In some embodiments, balance blocks 100 are provided on both axial sides of the rotor core 200. By providing balance blocks 100 on both axial sides of the rotor core 200, it is more beneficial to reduce the vibration of the whole machine and reduce the alternating load of the bearing.

[0067] The balance block 100 on one axial side of the rotor core 200 is defined as the first balance block 101, and the balance block 100 on the other axial side of the rotor core 200 is defined as the second balance block 102. The first balance block 101 is located between the rotor core 200 and the pump body, and the second balance block 102 is located on the side of the rotor core 200 away from the pump body. The first balance block 101 is closer to the pump body and has a larger mass than the second balance block 102, mainly bearing most of the radial centrifugal force correction. The second balance block 102 is farther from the pump body and has a smaller mass than the first balance block 101, bearing a smaller portion of the radial centrifugal force correction and mainly used to counteract unbalanced torque. With the cooperation of the first balance block 101 and the second balance block 102, dynamic balance correction can be performed simultaneously on both sides of the rotor core 200. The balance compensation range is wider and the correction accuracy is higher. The synergistic counterweight of the first balance block 101 and the second balance block 102 can more comprehensively offset the mass eccentricity generated during processing and assembly, effectively eliminate the centrifugal unbalanced force generated during high-speed rotation, significantly reduce the vibration amplitude and operating noise during operation, reduce the wear of bearings and other parts, and significantly improve the operating stability, reliability and service life of the compressor.

[0068] In some embodiments, the rotor assembly includes a connector that passes through and is fastened to the rotor core 200 and the counterweights 100 on both axial sides of the rotor core 200.

[0069] The balancing block 100 on one axial side of the rotor core 200 is defined as the first balancing block 101, and the balancing block 100 on the other axial side of the rotor core 200 is defined as the second balancing block 102. The same connecting piece passes through the connecting hole (first connecting hole 141 or second connecting hole 142) of the first balancing block 101, the connecting hole (first connecting hole 141 or second connecting hole 142) of the second balancing block 102, and the rotor core 200 (the rotor core 200 has a corresponding connecting hole). In this way, the first balancing block 101, the second balancing block 102, and the rotor core 200 are connected and fastened together, facilitating assembly. The connecting piece includes, but is not limited to, rivets and bolts.

[0070] A third aspect of this application discloses an electric motor including the aforementioned rotor assembly. For example, the motor includes a stator assembly and a rotor assembly, with the rotor assembly rotatably disposed inside the stator assembly, i.e., the stator assembly surrounds the rotor assembly. Through the cooperation of the stator assembly and the rotor assembly, the rotor assembly can rotate relative to the stator assembly. The rotor assembly of the motor in this embodiment adopts the technical solution of the above embodiments, and therefore possesses at least the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.

[0071] The fourth aspect of this application discloses a compressor including the aforementioned motor. For example, the compressor includes a motor and a pump body. The pump body is used to compress refrigerant, to compress low-temperature, low-pressure refrigerant into high-temperature, high-pressure refrigerant. The pump body includes a crankshaft, and the pump body is connected to the motor via the crankshaft. The motor includes a stator assembly and a rotor assembly, which cooperate with each other. Typically, the rotor assembly is rotatably disposed inside the stator assembly, that is, the stator assembly surrounds the rotor assembly. The rotor assembly is fitted onto the crankshaft and fixed to it. When the rotor assembly rotates, it drives the crankshaft to rotate, thereby realizing the compression of the refrigerant by the pump body. The motor of the compression molding machine in this embodiment adopts the technical solution of the above embodiment, and therefore has at least the beneficial effects brought by the technical solution of the above embodiment, which will not be repeated here.

[0072] The fifth aspect of this application discloses a refrigeration device, which includes the compressor described above. For example, the refrigeration device includes an evaporator, a condenser, and a compressor, which are interconnected to form a refrigerant cycle. The refrigeration device can provide cooling through the evaporator and heating through the condenser. The compressor of the refrigeration device in this embodiment adopts the technical solution of the above embodiments, and therefore has at least the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.

[0073] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0074] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A balance block (100), characterized in that, The balance block (100) includes a balance part (110) and a support arm (120). The support arm (120) is provided at the windward end (111) and the leeward end (112) of the balance part (110). The support arm (120) at the windward end (111) and the support arm (120) at the leeward end (112) of the balance part (110) are arranged alternately with one end away from the balance part (110). The balance part (110) is adapted to be connected to the rotor core (200), and the support arm (120) is adapted to be connected to the rotor core (200).

2. The balance block (100) as described in claim 1, characterized in that, The balancing part (110) and the support arm (120) are integrally formed; And / or, the balance block (100) is formed by stacking and connecting multiple plates.

3. The balance block (100) as described in claim 1, characterized in that, The support arm (120) extends circumferentially along the rotor core (200).

4. The balance block (100) as described in claim 1, characterized in that, A concave space (130) is formed between at least one of the inner and outer surfaces of the support arm (120) and the balancing part (110).

5. The balance block (100) as described in claim 4, characterized in that, Along the radial direction of the rotor core (200), the maximum thickness of the support arm (120) is less than the minimum thickness of the balancing part (110).

6. The balance block (100) as described in claim 5, characterized in that, A concave space (130) is formed between the outer surface of the support arm (120) and the balance part (110), and the inner surface of the support arm (120) and the inner surface of the balance part (110) are smoothly transitioned.

7. The balance block (100) as described in claim 1, characterized in that, The minimum distance between the center of mass of the balance block (100) and the balance part (110) is less than the minimum distance between the center of mass of the balance block (100) and the support arm (120).

8. The balance block (100) as described in claim 1, characterized in that, The balancing part (110) is provided with a first connecting hole (141), and the balancing part (110) is adapted to be connected to the rotor core (200) through the first connecting hole (141). The support arm (120) is provided with a second connecting hole (142), and the support arm (120) is adapted to be connected to the rotor core (200) through the second connecting hole (142).

9. The balance block (100) as described in claim 8, characterized in that, The support arm (120) includes a support rib (121) and a support platform (122). The support platform (122) is located at one end of the support rib (121) away from the balance part (110). The support platform (122) is provided with the second connecting hole (142).

10. The balance block (100) as described in claim 9, characterized in that, The thickness of the support rib (121) along the radial direction of the rotor core (200) is T, and the outer diameter of the support platform (122) is D, satisfying 0mm≤DT≤5mm.

11. The balance block (100) as described in claim 9, characterized in that, The balance block (100) has a mass of M, a center-of-gravity radius of R, and an axial height of H. The minimum wall thickness of the support platform (122) is t, satisfying t ≥ 5.

4. M R / H.

12. The balance block (100) as described in claim 9, characterized in that, Along the axial direction of the rotor core (200), the projected area of ​​the solid portion of the support platform (122) is s, and the projected area of ​​the second connecting hole (142) is e, satisfying s / e≥2.

13. A rotor assembly, characterized in that, The rotor assembly includes a rotor core (200) and a balance block (100) as described in any one of claims 1 to 12, wherein the balance block (100) is provided on both axial sides of the rotor core (200).

14. The rotor assembly as claimed in claim 13, characterized in that, The rotor assembly includes a connector that passes through and is fastened to the rotor core (200) and the counterweights (100) on both axial sides of the rotor core (200).

15. An electric motor, characterized in that, The motor includes the rotor assembly as described in claim 13 or 14.

16. A compressor, characterized in that, The compressor includes the motor as described in claim 15.

17. A refrigeration device, characterized in that, The refrigeration equipment includes the compressor as described in claim 16.

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