A rotor assembly and compressor

Abstract

The utility model embodiment provides a kind of rotor assembly and compressor, it is related to compressor technical field.Compressor includes rotor assembly, and rotor assembly includes rotor body and balance block.Multiple magnetic steel are provided in rotor body, and balance block is made of magnetic conductive material.Balance block includes the balance main body and first end plate connected, and first end plate is used to block up magnetic isolation hole, and balance main body is provided with magnetic isolation hole that is penetrated through itself in the axial direction on the end face of balance main body far from rotor body.Magnetic isolation hole can isolate the magnetic flux that flows through balance main body, can block the closed loop path of leakage magnetic field that passes through balance main body, to reduce leakage magnetic field, also can make the closed loop magnetic field that passes through balance main body more dispersed, can reduce the leakage magnetic intensity of leakage magnetic field that passes through balance block.

Description

Technical Field

[0001] This utility model relates to the field of compressor technology, and more specifically, to a rotor assembly and a compressor. Background Technology

[0002] The rotor assembly in the motor includes a rotor body and balance blocks. The rotor body includes a rotor core, with permanent magnets inserted inside the rotor core. There are baffles on both ends of the rotor core to restrict the permanent magnets from extending beyond the rotor core. Balance blocks are provided on the baffles on both ends of the rotor core. The balance blocks play a role in balancing dynamic and static balance to counteract the imbalance of the pump body and improve the balance during rotation.

[0003] The selection of balance block materials and their impact on motor performance. Using non-magnetic materials as balance blocks can reduce leakage magnetic fields, thereby reducing motor and compressor losses and improving energy efficiency. However, the disadvantage of this method is the high manufacturing cost, as these non-magnetic materials typically need to be produced through powder metallurgy or casting processes.

[0004] If a balance block made of magnetically conductive material is used, part of the magnetic field generated by the permanent magnet in the rotor assembly will flow through the balance block made of magnetically conductive material, resulting in magnetic leakage. Utility Model Content

[0005] The purpose of this invention is to provide a rotor assembly and compressor that can reduce magnetic leakage when the balance block is made of a magnetically conductive material.

[0006] The embodiments of this utility model can be implemented as follows:

[0007] In a first aspect, this utility model provides a rotor assembly, comprising:

[0008] The rotor body contains multiple magnets.

[0009] The balance block is made of magnetically conductive material. The balance block is connected to the rotor body and is located at the axial end of the rotor body. The balance block includes a connected balance body and a first end plate. The first end plate is provided on the end face of the balance body away from the rotor body. The balance body has magnetic isolation holes that penetrate through both ends of itself in the axial direction. The first end plate blocks the magnetic isolation holes.

[0010] With the above settings, the magnetic isolation hole can block the closed-loop path of the leakage magnetic field passing through the balance block, thereby reducing the leakage magnetic field. Moreover, the setting of the magnetic isolation hole can make the closed-loop magnetic field passing through the balance block more dispersed, thereby reducing the leakage magnetic field intensity of the leakage magnetic field passing through the balance block and reducing eddy current losses. This can effectively improve the efficiency and service life of the motor. The first end plate can prevent impurities from entering the magnetic isolation hole and also prevent oil from entering the magnetic isolation hole.

[0011] In an optional embodiment, the extension direction of the magnetic isolation hole is parallel to the axial direction of the rotor body, or the extension direction of the magnetic isolation hole is at an angle to the axial direction of the rotor body.

[0012] With the above configuration, when the extension direction of the magnetic isolation hole is parallel to the axial direction, the machining of the magnetic isolation hole can be facilitated. When the magnetic isolation hole is at an angle to the axial direction, magnetic leakage can be further reduced.

[0013] In an optional implementation, the axial projection area of ​​the magnetic isolation hole includes the axial projection area of ​​the corresponding magnet.

[0014] By implementing the above settings, the closed-loop leakage magnetic field of the magnets inside the rotor body passing through the balance block can be significantly disrupted, making the closed-loop magnetic field passing through the balance block more dispersed, thereby reducing the leakage magnetic field intensity passing through the balance block.

[0015] In an optional implementation, the balance block is opposite to n magnets, and all the magnetic isolation holes on the balance body are opposite to n magnets, where n≥1.

[0016] By setting it up as described above, the leakage flux caused by the balance block can be minimized, and the closed-loop magnetic field passing through the balance block can be more dispersed.

[0017] In an optional embodiment, the balancing body is provided with a plurality of magnetic isolation holes, each of which is axially opposite to a magnet.

[0018] With the above setup, the magnetic field originating from the N pole of the magnet opposite to the magnetic isolation hole is easily disrupted by the corresponding magnetic isolation hole, thus preventing the formation of a closed magnetic field and suppressing the leakage of magnetic flux in the rotor assembly 1.

[0019] In an optional implementation, multiple adjacent magnetic isolation holes form a hole group, in which adjacent magnetic isolation holes are connected or spaced apart.

[0020] With the above arrangement, adjacent magnetic isolation holes in the hole group can be connected. Adjacent magnetic isolation holes in the hole group can also be spaced out to correspond to the corresponding magnets.

[0021] In an optional embodiment, the balancing body includes multiple stacked balancing plates, each balancing plate having a through hole, and the through holes on the multiple balancing plates together form a magnetic shielding hole.

[0022] With the above setup, the process cost of forming a balance block by stacking multiple balance plates is relatively low, thereby reducing the manufacturing cost of the balance block.

[0023] In an optional embodiment, the thickness of the balance block in the axial direction is H, the total thickness of all the balance plates in the axial direction is H1, a second end plate is provided on the end face of the balance body away from the first end plate, the total thickness of the first end plate and the second end plate in the axial direction is H2, the height of the magnet in the axial direction is G, and H1+H2=H.

[0024] When H ≤ G / 4, 1a ≤ H1 / H2 ≤ 15;

[0025] In the case that G / 2≤H≤G, H2≤1.

[0026] By setting it up as described above, the leakage flux caused by the balance block can be reduced as much as possible.

[0027] In an optional embodiment, a second end plate is also provided on the end face of the balancing body away from the first end plate;

[0028] The cross-sectional profiles of the first end plate and the second end plate in the preset direction are adapted to the cross-sectional profiles of the balancing body in the preset direction, and the preset direction is perpendicular to the axial direction.

[0029] With the above setup, the first end plate and the second end plate can completely seal both ends of the magnetic isolation hole on the balance body, so as to effectively prevent impurities from entering the magnetic isolation hole.

[0030] Secondly, the present invention provides a compressor, including a motor, wherein the motor includes a rotor assembly of any of the foregoing embodiments.

[0031] In an optional embodiment, the motor further includes a stator, and an annular air gap is formed between the stator and the rotor body, wherein the minimum diameter of the magnetic isolation hole is greater than or equal to the annular width of the air gap.

[0032] In an optional embodiment, the motor further includes a stator, and the stator and rotor body have an air gap in the radial direction. The minimum diameter of the magnetic isolation hole is greater than or equal to the air gap. The beneficial effects provided by this embodiment include: This embodiment provides a rotor assembly and a compressor. The compressor includes a rotor assembly, which includes a rotor body and a balance block. Multiple magnets are disposed within the rotor body, and the balance block is made of a magnetically conductive material. The balance block is connected to the rotor body and located at the axial end of the rotor body. The balance block includes a connected balance body and a first end plate. The first end plate is disposed on the end face of the balance body away from the rotor body, and the first end plate is used to block the magnetic isolation hole. The balance body has magnetic isolation holes penetrating both ends of itself in the axial direction. The magnetic isolation hole isolates the magnetic flux flowing through the balance body, blocking the closed-loop path of the leakage magnetic field passing through the balance body, thereby reducing magnetic leakage. Furthermore, the magnetic isolation hole also makes the closed-loop magnetic field passing through the balance body more dispersed, thereby reducing the leakage magnetic field intensity passing through the balance block and reducing eddy current losses, effectively improving the efficiency and service life of the motor. Attached Figure Description

[0033] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 An exploded view of the rotor assembly provided in an embodiment of this utility model;

[0035] Figure 2 A cross-sectional schematic diagram of the rotor assembly provided in an embodiment of this utility model;

[0036] Figure 3 This is one of the structural schematic diagrams of the balance block provided in an optional embodiment of the present invention;

[0037] Figure 4 for Figure 3 An explosion diagram;

[0038] Figure 5 A schematic diagram of the structure of the balancing body provided in an optional embodiment of this utility model;

[0039] Figure 6 A second schematic diagram of the structure of the balance block provided in an optional embodiment of this utility model;

[0040] Figure 7 for Figure 6 Perspective view when viewed directly;

[0041] Figure 8 A top view of the balancing body provided in an optional embodiment of this utility model;

[0042] Figure 9 for Figure 6 An explosion diagram.

[0043] Icons: 1-Rotor assembly; 100-Balance block; 101-Matching hole; 110-Balance plate; 111-Through hole; 120-Magnetic isolation hole; 130-Connecting hole; 140-First end plate; 150-Second end plate; 160-Balance body; 200-Rotor body; 210-Rotor core; 220-Magnet; 300-Fastener. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0045] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0046] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0047] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed during use, they are only for the convenience of describing this utility model 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 utility model.

[0048] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0049] It should be noted that, where there is no conflict, the features in the embodiments of this utility model can be combined with each other.

[0050] It should be noted that the rotor assembly provided in this embodiment is used in a motor. The parallelism in this embodiment is not limited to being parallel in a strict sense; it is sufficient that the two are roughly parallel.

[0051] In related technologies, if a motor uses a balance block made of magnetically conductive material, and the rotor core contains magnets, the leakage magnetic field originates from the N pole of the magnets, passes through the air or a baffle, enters the balance block, passes through the balance block itself, and then passes through the air or a baffle back to the S pole of the magnets, forming a closed-loop magnetic circuit that does not participate in the motor's operation. This magnetic field contributes nothing to the motor's output and is called the leakage magnetic field. Because the balance block itself is magnetically conductive, the leakage magnetic field is relatively large. On the one hand, the magnetic conductivity of the balance block itself increases the strength of the leakage magnetic field, significantly reducing the beneficial main magnetic field of the motor; on the other hand, the balance block itself is a single unit, and the leakage magnetic field flows within it, creating significant eddy current losses, thus increasing the overall motor losses.

[0052] This utility model provides a rotor assembly that can reduce the closed-loop magnetic field flowing through the balance block, thereby reducing magnetic leakage and improving the energy efficiency of the motor.

[0053] The following describes in detail, with reference to the accompanying drawings, the specific structure of a rotor assembly provided by this utility model and its corresponding technical effects.

[0054] Please refer to Figures 1-4 The present invention provides a rotor assembly 1 including a rotor body 200 and a balance block 100. The rotor body 200 is provided with a plurality of magnets 220, and the balance block 100 is made of magnetically conductive material and is connected to the rotor body 200.

[0055] The balance block 100 includes a balance body 160 and a first end plate 140 connected to each other. The first end plate 140 is provided on the end face of the balance body 160 away from the rotor body 200. The first end plate 140 is connected to the rotor body 200 and is located at the end of the rotor body 200 in the axial direction. The first end plate 140 is used to block the magnetic isolation hole 120. The balance body 160 has a magnetic isolation hole 120 that runs through both ends of itself along the axis. The magnetic isolation hole 120 is located in the area formed by the side wall of the balance body 160.

[0056] It should be noted that the balance block 100 in this embodiment is made of a magnetically conductive material. Magnetically conductive materials, also known as magnetic materials or soft magnetic materials, have the characteristic of being easily magnetized and demagnetized. The magnetically conductive material can be low-carbon steel, silicon steel, iron-nickel alloy, or cast iron, etc. In this embodiment, the magnet 220 can be a permanent magnet. The axial direction in this embodiment can be understood as the axial direction of the rotor body 200.

[0057] In detail, the rotor body 200 in this embodiment includes a rotor core 210 and a plurality of magnets 220. The plurality of magnets 220 are disposed within the rotor core 210.

[0058] Generally, the rotor body 200 also includes a baffle, which is disposed at the end of the rotor core 210. The baffle is used to restrict the magnet 220 from moving out of the rotor core 210.

[0059] Understandably, in some existing related technologies, to reduce manufacturing costs of the balance block 100 made of non-magnetic material, a balance block 100 made of magnetic material is used. The rotor core 210 contains magnets 220. A portion of the magnetic field generated by the magnets 220 does not pass entirely through the intended efficient magnetic circuit (such as the rotor core 210). Instead, it originates from the N pole of the magnets 220, passes through air or a baffle into the magnetically conductive balance block 100, and then returns to the S pole of the magnets 220 through air or a baffle, forming a closed-loop magnetic circuit that does not participate in the motor's operation. This closed-loop magnetic circuit provides no benefit to the motor's output, and this magnetic field becomes a leakage magnetic field. Therefore, the balance block 100 attracts a portion of the magnetic flux that should be concentrated on the main working magnetic circuit, reducing the strength of the effective magnetic field (i.e., the main magnetic field) that directly contributes to the motor's output.

[0060] Furthermore, as a single magnetic conductor, the leakage magnetic field flowing inside the balance block 100 can cause significant eddy current losses. These eddy current losses are dissipated as heat, which not only wastes energy but may also cause the motor temperature to rise, affecting the motor's efficiency and lifespan.

[0061] In this embodiment, the balancing body 160 is provided with a magnetic isolation hole 120. Due to the setting of the magnetic isolation hole 120, the magnetic isolation hole 120 will isolate the magnetic flux flowing through the balancing body 160, which can block the closed-loop path of the leakage magnetic field passing through the balancing block 100, thereby reducing the leakage magnetic field. Moreover, the setting of the magnetic isolation hole 120 can make the closed-loop magnetic field passing through the balancing block 100 more dispersed, thereby reducing the leakage magnetic field intensity of the leakage magnetic field passing through the balancing block 100, and also reducing eddy current losses, which can effectively improve the efficiency and service life of the motor.

[0062] Furthermore, since the first end plate 140 in this embodiment blocks the magnetic isolation hole 120, impurities can be prevented from entering the magnetic isolation hole 120, and oil can also be prevented from entering the magnetic isolation hole 120.

[0063] Optionally, the extension direction of the magnetic isolation hole 120 is parallel to the axial direction of the rotor body 200, that is, the magnetic isolation hole 120 extends along the axial direction of the rotor body 200, and the magnetic isolation hole 120 is a straight hole. This facilitates the fabrication of the magnetic isolation hole 120 on the balance block.

[0064] Optionally, in some other embodiments, the extending direction of the magnetic isolation hole 120 may also form an angle with the axial direction of the rotor body 200. That is, the magnetic isolation hole 120 may also be an oblique hole to reduce magnetic leakage. It is understood that there are generally two balance blocks 100 in the rotor assembly 1. The two balance blocks 100 are respectively arranged at both ends of the rotor body 200. That is, balance blocks 100 are provided at both ends of the rotor body 200. The two balance blocks 100 mainly play the role of balancing dynamic and static balance to counteract the imbalance of the pump body structure and ensure the balance of the rotor assembly 1 during rotation.

[0065] Alternatively, please refer to Figure 9 The balance block 100 also includes a second end plate 150. Specifically, the second end plate 150 is provided on the end face of the balance body 160 away from the first end plate 140. The first end plate 140 is away from the rotor body 200 relative to the second end plate 150.

[0066] Please refer to Figures 6-9 Optionally, the cross-sectional profiles of the first end plate 140 and the second end plate 150 in the preset direction are adapted to the cross-sectional profile of the balancing body 160 in the preset direction. It should be noted that the adaptation of the cross-sectional profiles of the first end plate 140 and the second end plate 150 in the preset direction to the cross-sectional profile of the balancing body 160 in the preset direction can be understood as the first end plate 140 and the second end plate 150 in the preset direction being similar to or the same as the cross-sectional profile of the balancing body 160 in the preset direction.

[0067] The preset direction is perpendicular to the axis. Specifically, in this embodiment, the outer contours of the first end plate 140 and the second end plate 150 are roughly the same as the contour of the balancing body 160. The first end plate 140 and the second end plate 150 can completely block both ends of the magnetic isolation hole 120 on the balancing body 160, so as to effectively prevent impurities from entering the magnetic isolation hole 120.

[0068] Optionally, the balance block 100 is connected to the rotor body 200 mainly through fasteners 300. Specifically, the balance block 100 is provided with a connection hole 130, and the rotor body 200 is provided with a mating hole 101 corresponding to the connection hole 130. The rotor assembly 1 also includes fasteners 300. That is, the balance body 160, the first end plate 140 and the second end plate 150 are all provided with connection holes 130. The balance block 100 is connected to the rotor body 200 through the fasteners 300 passing through the connection hole 130 and the mating hole 101. Specifically, the baffle is provided with a mating hole 101. That is, the fasteners 300 can pass through the connection hole 130 on the balance block 100 and the mating hole 101 on the baffle to connect the balance block 100 to the rotor body 200.

[0069] The fastener 300 can be a threaded fastener or a rivet. That is, the balance block 100 can be fixedly installed on the rotor body 200 by screws or rivets, which can ensure the connection strength between the balance block 100 and the rotor body 200, so that the rotor assembly 1 can rotate relatively balanced, thereby ensuring the working efficiency of the motor.

[0070] Optionally, a magnetic isolation hole 120 is axially opposite to at least one magnet 220. It should be noted that the opposite in this embodiment is not understood as direct opposite. That is, in this embodiment, although the magnetic isolation hole 120 and the magnet 220 in the rotor body 200 are separated by a baffle and / or a second end plate 150, they only need to intersect at least partially in the axial projection area.

[0071] Understandably, this setup can significantly disrupt the closed-loop leakage magnetic field of the magnet 220 inside the rotor body 200 passing through the balance body 160, making the closed-loop magnetic field passing through the balance body 160 more dispersed, thereby reducing the leakage magnetic field intensity of the leakage magnetic field passing through the balance body 160.

[0072] Optionally, in this embodiment, a magnetic isolation hole 120 is axially opposite to a magnet 220. That is, in the axial direction, the axial projection area of ​​a magnetic isolation hole 120 intersects at least partially with the axial projection area of ​​a magnet 220 in a rotor body 200. The magnetic isolation hole 120 will isolate the magnetic flux flowing through the balance body 160. Therefore, the magnetic field originating from the N pole of the magnet 220 opposite to the magnetic isolation hole 120 is easily destroyed by the corresponding magnetic isolation hole 120, so that a closed magnetic field cannot be formed, which can suppress the leakage of magnetic flux in the rotor assembly 1.

[0073] Of course, in some other embodiments, a magnetic isolation hole 120 is opposite to a plurality of magnets 220. In this embodiment, "plural" can be understood as two or more. That is, the axial projection area of ​​a magnetic isolation hole 120 at least partially overlaps with the axial projection areas of the plurality of magnets 220.

[0074] For example, the axial projection area of ​​a magnetic isolation hole 120 may at least partially overlap with the axial projection areas of two magnets 220, or the axial projection area of ​​a magnetic isolation hole 120 may at least partially overlap with the axial projection areas of two magnets 220.

[0075] The balancing body 160 is opposite to n magnets 220. In order to minimize the leakage magnetic flux of the balancing body 160, in this embodiment, all the magnetic isolation holes 120 on the balancing body 160 are opposite to n magnets 220, and the number of n is greater than or equal to 1.

[0076] For example, the balancing body 160 is opposite to the four magnets 220, and all the magnetic isolation holes 120 on the balancing body 160 are opposite to the four magnets 220.

[0077] In this embodiment, the balancing body 160 is provided with a plurality of magnetic isolation holes 120, each magnetic isolation hole 120 being opposite to a magnet 220. That is to say, each magnetic isolation hole 120 on the balancing body 160 corresponds to a magnet 220.

[0078] Please refer to Figure 2 To further reduce magnetic flux leakage caused by the balancing body 160, in this embodiment, the axial projection area of ​​the magnetic isolation hole 120 includes the axial projection area of ​​the corresponding magnet 220. It can be understood that each magnetic isolation hole 120 has a magnet 220 below it, and the axial projection area of ​​the magnet 220 is included within the axial projection area of ​​the magnetic isolation hole 120. This allows for more effective control of the magnetic field path, preventing the magnetic field from forming unnecessary closed loops through the magnetic balancing body 160. This minimizes magnetic flux leakage, concentrating more magnetic flux of the magnet 220 within the intended working area.

[0079] In this embodiment, the shape of the magnetic isolation hole 120 is adapted to the shape of the magnet 220. That is, when the shape of a single magnet 220 is a sheet-like quadrilateral, the shape of the magnetic isolation hole 120 is also a quadrilateral hole adapted to the magnet 220. At this time, the radial length of the first hole is greater than the length of the magnet 220, and the radial width of the first hole is greater than the width of the magnet 220.

[0080] In other words, the shape of the magnetic isolation hole 120 being adapted to the shape of the magnet 220 can be understood as the shape of the magnetic isolation hole 120 being similar to or the same as the shape of the magnet 220. Specifically, in this embodiment, the shape of the magnetic isolation hole 120 is similar to the shape of the magnet 220. In particular, in this embodiment, the axial projection area of ​​the magnetic isolation hole 120 includes the axial projection area of ​​the magnet 220.

[0081] When a single magnet 220 has a cylindrical shape, the magnetic isolation hole 120 is a circular hole that matches the magnet 220. This facilitates more precise alignment of the magnetic isolation hole 120 with the corresponding magnet 220 and also makes the processing of the magnetic isolation hole 120 easier.

[0082] In detail, in this embodiment, the magnet 220 is a sheet-like quadrilateral structure, and the magnetic isolation hole 120 is a strip-shaped hole adapted to it, and is roughly quadrilateral in shape.

[0083] Optionally, multiple adjacent magnetic isolation holes 120 form a hole group, and adjacent magnetic isolation holes 120 within the hole group are connected or spaced apart.

[0084] For example, in some embodiments, two adjacent magnetic isolation holes 120 of the balance block 100 form a hole group, and the balance block 100 has only one hole group, with adjacent magnetic isolation holes 120 in the hole group being spaced apart.

[0085] For example, in some embodiments, two adjacent magnetic isolation holes 120 of the balance block 100 form a group of holes, and the balance block 100 has only one group of holes, in which adjacent magnetic isolation holes 120 are connected.

[0086] For example, in some embodiments, two adjacent magnetic isolation holes 120 on the balance block 100 form a group of holes, and the balance block 100 has two groups of holes, and the magnetic isolation holes 120 in the group of holes are connected.

[0087] Of course, in some other embodiments, the hole group may be formed by three or four adjacent magnetic isolation holes 120.

[0088] Therefore, the two adjacent magnetic isolation holes 120 on the balancing body 160 can be spaced apart.

[0089] Optionally, the two adjacent magnetic isolation holes 120 on the balancing body 160 can also be connected to facilitate the processing of adjacent holes.

[0090] In some alternative embodiments, the balancing body 160 may have two adjacent magnetic isolation holes 120 spaced apart, or it may have two adjacent and connected magnetic isolation holes 120 at the same time.

[0091] Please refer to Figure 5 In some optional embodiments, the balancing body 160 includes a plurality of stacked balancing plates 110, each balancing plate 110 having a through hole 111, and the through holes 111 on the plurality of balancing plates 110 together forming a magnetic shielding hole 120. Similarly, each balancing plate 110 has a connecting hole 130, and the fastener 300 can sequentially pass through the connecting holes 130 on the plurality of balancing plates 110 to connect with the mating hole 101 on the baffle.

[0092] Understandably, the balance block 100 is made up of multiple balance plates 110 stacked together. When making the balance block 100, the number of balance plates 110 can be adjusted to distribute the weight according to the condition of the motor.

[0093] It should be noted that, in order to ensure that each balance plate 110 is in a relatively fixed state when multiple balance plates 110 are stacked, in some embodiments, the balance plate 110 may be provided with a groove, which may be formed by stamping, and the back of the groove has a protrusion. For any two adjacent balance plates 110 in the axial direction, the protrusion of one balance plate 110 is disposed in the groove of the other balance plate 110. This arrangement can ensure that the multiple balance plates 110 stacked together are fixedly stacked together.

[0094] Furthermore, the process cost of forming the balance block 100 by stacking multiple balance plates 110 is relatively low, thereby reducing the manufacturing cost of the balance block 100.

[0095] Please refer to Figure 9 The total axial thickness of all the balance plates 110 is H1, and the total axial thickness of the first end plate 140 and the second end plate 150 is H2. Specifically, in this embodiment, the axial thickness of the first end plate 140 is x, and the axial thickness of the second end plate 150 is H2-x, where H2 > x. The axial height of the magnet 220 is G, where H1 + H2 = H.

[0096] The heights of H1 and H2 can be effectively adjusted based on the value of the permanent magnet height G, thereby controlling the leakage flux of the magnet 220 and thus regulating the energy efficiency of the motor and compressor.

[0097] Optionally, in this embodiment, the thickness of the first end plate 140 and the second end plate 150 are the same. Of course, the thickness of each balance plate 110 can also be the same.

[0098] Alternatively, if H ≤ G / 4, then 1 ≤ H1 / H2 ≤ 15. If G / 2 ≤ H ≤ G, then H2 ≤ 1.

[0099] To minimize the leakage flux caused by the balance block 100.

[0100] This embodiment of the invention also provides a compressor, which includes a motor, and the motor includes the rotor assembly 1 described above. The compressor also includes a housing, cylinder, piston, and crankshaft, etc., with the crankshaft connecting the electric rotor to the compression mechanism (e.g., the piston). The cylinder is primarily the component where the compression process occurs, while the piston moves within the cylinder to compress the medium.

[0101] The motor also includes a stator, with an annular air gap formed between the stator and the rotor body 200. Optionally, to effectively avoid unnecessary closed loops formed by the magnetic field through the balance block 100, and to minimize the propagation of the magnetic field in unintended paths, thereby concentrating more magnetic flux in the effective operating area of ​​the motor and optimizing the magnetic field distribution, the minimum diameter of the magnetic isolation hole 120 is greater than or equal to the annular width of the air gap.

[0102] In this embodiment, since the compressor includes a motor, and the motor includes the rotor assembly 1 described above, the compressor in this embodiment also has the same technical effects as the rotor assembly 1. Therefore, the technical effects of the compressor will not be described in detail here.

[0103] In summary, this utility model embodiment provides a rotor assembly 1 and a compressor. The compressor includes a rotor assembly 1, which includes a rotor body 200 and a balance block 100. The rotor body 200 contains a plurality of magnets 220, and the balance block 100 is made of a magnetically conductive material. The balance block 100 includes a connected balance body 160 and a first end plate 140. The first end plate 140 is located on the end face of the balance body 160 away from the rotor body 200, and is used to block the magnetic isolation hole 120. The balance body 160 has the magnetic isolation hole 120. The magnetic isolation hole 120 isolates the magnetic flux flowing through the balance body 160, blocking the closed-loop path of the leakage magnetic field passing through the balance body 160, thereby reducing magnetic leakage. Furthermore, the magnetic isolation hole 120 also makes the closed-loop magnetic field passing through the balance body 160 more dispersed, thereby reducing the leakage magnetic field intensity passing through the balance block 100 and reducing eddy current losses, effectively improving the efficiency and service life of the motor.

[0104] The above description is only a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model.

Claims

1. A rotor assembly, characterized in that, include: Rotor body (200), wherein a plurality of magnets (220) are provided inside the rotor body (200); The balance block (100) is made of magnetic material. The balance block (100) is connected to the rotor body (200) and located at the axial end of the rotor body (200). The balance block (100) includes a balance body (160) and a first end plate (140) connected to each other. The first end plate (140) is provided on the end face of the balance body (160) away from the rotor body (200). The balance body (160) has magnetic isolation holes (120) that penetrate through its two axial ends. The first end plate (140) blocks the magnetic isolation holes (120).

2. The rotor assembly according to claim 1, characterized in that: The extension direction of the magnetic isolation hole (120) is parallel to the axial direction of the rotor body (200), or the extension direction of the magnetic isolation hole (120) is at an angle to the axial direction of the rotor body (200).

3. The rotor assembly according to claim 1, characterized in that: The axial projection area of ​​the magnetic isolation hole (120) includes the axial projection area of ​​the corresponding magnet (220).

4. The rotor assembly according to claim 1, characterized in that: The balancing body (160) is provided with a plurality of magnetic isolation holes (120), each of the magnetic isolation holes (120) being opposite to a magnet (220) in the axial direction.

5. The rotor assembly according to claim 4, characterized in that: Multiple adjacent magnetic isolation holes (120) form a hole group, wherein adjacent magnetic isolation holes (120) in the hole group are connected or spaced apart.

6. The rotor assembly according to claim 1, characterized in that: The balancing body (160) includes a plurality of stacked balancing plates (110), each of the balancing plates (110) is provided with a through hole (111), and the through holes (111) on the plurality of balancing plates (110) together form the magnetic isolation hole (120).

7. The rotor assembly according to claim 6, characterized in that: The thickness of the balance block (100) in the axial direction is H, the total thickness of all the balance plates (110) in the axial direction is H1, the end face of the balance body (160) away from the first end plate (140) is also provided with a second end plate (150), the total thickness of the first end plate and the second end plate (150) in the axial direction is H2, the height of the magnet (220) in the axial direction is G, H1+H2=H; When H ≤ G / 4, 1a ≤ H1 / H2 ≤ 15; In the case that G / 2≤H≤G, H2≤1.

8. The rotor assembly according to any one of claims 1-7, characterized in that: The balancing body (160) is provided with a second end plate (150) on one end face away from the first end plate (140). The cross-sectional profiles of the first end plate (140) and the second end plate (150) in a preset direction are adapted to the cross-sectional profile of the balancing body (160) in the preset direction. The preset direction is perpendicular to the axial direction.

9. A compressor, characterized in that, Includes an electric motor, the electric motor comprising the rotor assembly as described in any one of claims 1-8.

10. A compressor according to claim 9, characterized in that: The motor also includes a stator, and an annular air gap is formed between the stator and the rotor body (200), and the minimum diameter of the magnetic isolation hole (120) is greater than or equal to the annular width of the air gap.

Images