Rotor magnet assembly, compressor rotor and compressor

Abstract

The invention discloses a mover magnet assembly, a compressor mover and a compressor. The mover magnet assembly comprises a magnet, a rotor and a rotor, and the plastic coating layer is coated outside the magnet body. The rotor magnet assembly has the advantages of being stable, reliable, low in noise, small in eddy current loss, good in insulativity, high in production efficiency and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of manufacturing of compression devices, and more particularly, to a mover magnet assembly, a compressor mover having the mover magnet assembly, and a compressor having the compressor mover. Background Art

[0002] In a linear compressor in the related art, the mover is formed by adhesively bonding a permanent magnet to a metal back iron ring with glue and wrapping the outer circumference with carbon fiber to ensure the bonding force between the magnet steel and the back iron. On the one hand, when the metal back iron moves in a magnetic field, the magnetic flux passing through the metal changes, resulting in an induced electromotive force inside the metal and then forming eddy currents. This not only affects the operating efficiency of the compressor due to eddy current losses, but also causes the metal back iron to generate high temperatures during the operation of the motor, which easily leads to demagnetization, degumming, and falling off risks of the permanent magnet at high temperatures. On the other hand, the metal back iron is prone to vibration under the impact of torque ripple, resulting in fluctuations in the performance of the compressor and relatively high noise. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. For this purpose, the present invention provides a mover magnet assembly, which has the advantages of stable and reliable performance, low noise, low eddy current loss, good insulation, and high production efficiency.

[0004] The present invention also provides a compressor mover having the mover magnet assembly.

[0005] The present invention further provides a compressor having the compressor mover.

[0006] To achieve the above object, according to an embodiment of the first aspect of the present invention, a mover magnet assembly is provided, which includes: a magnet; and a plastic coating layer that coats the magnet.

[0007] The mover magnet assembly according to the embodiment of the present invention has the advantages of stable and reliable performance, low noise, low eddy current loss, good insulation, and high production efficiency.

[0008] In addition, the mover magnet assembly according to the above embodiment of the present invention may further have the following additional technical features:

[0009] According to an embodiment of the present invention, a plurality of the magnets are axially spaced apart along the mover magnet assembly, and the plastic coating layer coats the plurality of magnets.

[0010] According to an embodiment of the present invention, a spacer is provided between two adjacent magnets in the axial direction, and the spacer is made of a non-magnetic material.

[0011] According to an embodiment of the present invention, the thickness of the spacer is one quarter of the axial dimension of the magnet with the smallest axial dimension among the plurality of magnets.

[0012] According to an embodiment of the present invention, the plastic coating layer is a mass film plastic part, and the spacer is a carbon fiber material part.

[0013] According to an embodiment of the present invention, the magnet includes: a main magnet; two sub-magnets, the main magnet is located between the two sub-magnets in the axial direction of the rotor magnet assembly, and the axial dimension of the sub-magnet is smaller than the axial dimension of the main magnet.

[0014] According to an embodiment of the present invention, the difference between the axial dimension of the sub-magnet and the axial dimension of the main magnet is 8-10 millimeters.

[0015] According to an embodiment of the present invention, the thickness of the plastic coating layer is 1-3 millimeters.

[0016] According to an embodiment of the second aspect of the present invention, a compressor rotor is provided, which includes: a rotor magnet assembly, the rotor magnet assembly is the rotor magnet assembly according to the embodiment of the first aspect of the present invention; a moving disk, the rotor magnet assembly is connected to the moving disk; a piston, the piston is connected to the moving disk.

[0017] The compressor rotor according to the embodiment of the present invention, by using the rotor magnet assembly according to the embodiment of the first aspect of the present invention, has the advantages of stable and reliable operation, low noise, low eddy current loss, good insulation, and high production efficiency.

[0018] According to an embodiment of the present invention, the rotor magnet assembly is connected to the moving disk by a threaded fastener.

[0019] According to an embodiment of the third aspect of the present invention, a compressor is provided, which includes the compressor rotor according to the embodiment of the second aspect of the present invention.

[0020] The compressor according to the embodiment of the present invention, by using the compressor rotor according to the embodiment of the second aspect of the present invention, has the advantages of stable and reliable operation, low noise, low eddy current loss, good insulation, and high production efficiency.

[0021] The additional aspects and advantages of the present invention will be partially given in the following description, partially will become obvious from the following description, or be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above and / or additional aspects and advantages of the present invention will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, where:

[0023] Figure 1 It is a cross-sectional view of a mover magnet assembly according to an embodiment of the present invention.

[0024] Figure 2 It is a cross-sectional view of a compressor according to an embodiment of the present invention.

[0025] Figure 3 It is a schematic diagram of the peak thrust of a compressor in the related art and a compressor according to an embodiment of the present invention.

[0026] Reference numerals: Compressor 1, mover magnet assembly 10, main magnet 110, auxiliary magnet 120, plastic coating layer 200, spacer 300, moving disk 20, piston 30, housing 40, yoke 50, coil 60, piston cylinder 70, leaf spring 80. Detailed Description of the Invention

[0027] This application is made based on the inventor's discovery and recognition of the following facts and problems:

[0028] In a linear compressor in the related art, the mover is formed by bonding a permanent magnet to a metal back iron ring with glue and wrapping the outer circle with carbon fiber to ensure the bonding force between the magnet steel and the back iron. On the one hand, when the metal back iron moves in the magnetic field, the magnetic flux passing through the metal changes, resulting in an induced electromotive force inside the metal, and then forming eddy currents. This not only affects the operating efficiency of the compressor due to eddy current losses, but also the metal back iron generates high temperatures during the operation of the motor, which easily leads to the risk of demagnetization, degumming, and shedding of the permanent magnet at high temperatures. On the other hand, the metal back iron is prone to vibration under the impact of torque ripple, resulting in fluctuations in the performance of the compressor and relatively high noise.

[0029] In addition, for the mover of a compressor in the related art, a single-polarity permanent magnet mover magnet assembly is used axially, resulting in a relatively small peak thrust. Moreover, due to the asymmetry of the permanent magnet position and the uneven distribution of materials, the mover magnetic circuit is unbalanced, resulting in an increase in the harmonic content of the back electromotive force of the motor and a decrease in the sinusoidality of the back electromotive force, making the vibration and noise of the motor worse.

[0030] Embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the drawings, where 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 drawings are exemplary and are only used to explain the present invention and should not be construed as limiting the present invention.

[0031] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention 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 on the present invention. In addition, the features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0032] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "mounted", "connected" and "coupled" shall be construed broadly. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] The mover magnet assembly 10 according to an embodiment of the present invention will be described below with reference to the drawings.

[0034] As Figure 1 and Figure 2 shown, the mover magnet assembly 10 according to an embodiment of the present invention includes a magnet and a plastic coating layer 200.

[0035] The plastic coating layer 200 covers the outside of the magnet.

[0036] Specifically, the plastic coating layer 200 is formed outside the magnet by injection molding. For example, the magnet is placed in an injection mold, and an injection molding material is injected into the mold, and after curing, the plastic coating layer 200 is formed.

[0037] Each of the magnets may include a plurality of sub-magnets arranged in a circumferential direction to form a ring.

[0038] For the mover magnet assembly 10 according to an embodiment of the present invention, by using the plastic coating layer 200 to cover the magnet, the magnet can be wrapped into an integral structure by the plastic coating layer 200. Compared with the technical solution in the related art in which the magnet is bonded to the metal back iron, the impact resistance of the mover can be improved, and the situations of magnet displacement, degumming and falling off can be avoided, and the stability and reliability of the mover can be improved.

[0039] Moreover, by using the plastic coating layer 200 to coat the magnet, compared with the technical solution of bonding the magnet to the metal back iron in the related art, the metal back iron can be omitted. On the one hand, it can avoid the vibration of the metal back iron under the impact of torque ripple, and avoid the performance fluctuation and noise generation of the compressor caused by the vibration of the metal back iron. On the other hand, it can avoid the generation of eddy current in the metal back iron, which can not only avoid eddy current loss and ensure the operation efficiency of the compressor, but also avoid the metal back iron generating high temperature due to eddy current, avoid the magnet demagnetizing due to high temperature, improve the reliability of the rotor magnet assembly 10, and also improve the insulation of the rotor magnet assembly 10.

[0040] In addition, by using the plastic coating layer 200 to coat the magnet, compared with the technical solution of bonding the magnet to the metal back iron in the related art, the glue curing process can be omitted, the process beat time can be saved, the production efficiency can be improved, the concentricity of the rotor can be improved, the unbalance amount of the rotor can be reduced, the rubbing with the yoke can be avoided, and the operation stability and operation efficiency of the compressor can be improved.

[0041] Therefore, the rotor magnet assembly 10 according to the embodiment of the present invention has the advantages of stable and reliable, low noise, small eddy current loss, good insulation, high production efficiency, etc.

[0042] Next, the rotor magnet assembly 10 according to the specific embodiment of the present invention will be described with reference to the accompanying drawings.

[0043] In some specific embodiments of the present invention, as Figure 1 and Figure 2 shown, the rotor magnet assembly 10 according to the embodiment of the present invention includes a magnet and a plastic coating layer 200.

[0044] Advantageously, as Figure 1 and Figure 2 shown, the magnets are multiple and arranged at intervals along the axial direction of the rotor magnet assembly 10, and the plastic coating layer 200 is coated outside the multiple magnets. Specifically, each magnet may include multiple sub-magnets arranged in a ring shape along the circumferential direction. In this way, multiple magnets can be arranged in the axial direction, which can help to improve the peak thrust of the compressor compared with the single magnet in the axial direction in the related art.

[0045] More advantageously, as Figure 1 and Figure 2 shown, a spacer 300 is provided between two adjacent magnets in the axial direction, and the spacer 300 is a non-magnetic material part. This can reduce the magnetic leakage between two adjacent magnets in the axial direction, make the magnetic circuit of the rotor magnet assembly 10 more balanced, reduce the harmonic content of the back electromotive force, improve the sinusoidality of the back electromotive force, reduce the vibration and noise of the compressor, and improve the efficiency of the compressor.

[0046] Optionally, the plastic-coated layer 200 is a bulk molding compound (BMC) part. This can endow the plastic-coated layer 200 with good heat conduction performance to improve the heat dissipation effect of the mover magnet assembly 10, and can also make the plastic-coated layer 200 have good structural strength, high temperature resistance, chemical corrosion resistance and electrical insulation, as well as low elongation and shrinkage rates. The spacer 300 is a carbon fiber material part. This can make the spacer 300 have good structural strength, magnetic isolation, high temperature resistance, and a light weight.

[0047] Figure 1 and Figure 2 shows a mover magnet assembly 10 according to some examples of the present invention. As Figure 1 and Figure 2 shown, the magnet includes a main magnet 110 and two sub-magnets 120. The main magnet 110 is located between the two sub-magnets 120 in the axial direction of the mover magnet assembly 10, and the axial dimension of the sub-magnet 120 is smaller than the axial dimension of the main magnet 110. Specifically, the main magnet 110 may include a plurality of sub-magnets arranged in a circumferential ring, and each sub-magnet 120 may include a plurality of sub-magnets arranged in a circumferential ring. This can form a structure in which the main magnet 110 with a larger axial dimension is provided with sub-magnets 120 with smaller axial dimensions at both ends, optimize the magnetic circuit of the mover magnet assembly 10, and further facilitate the improvement of the peak thrust of the compressor.

[0048] Optionally, the difference between the axial dimension of the sub-magnet 120 and the axial dimension of the main magnet 110 is 8 - 10 mm. Here, the preferred difference is 9 mm. This can further facilitate the improvement of the peak thrust of the compressor.

[0049] Furthermore, the thickness of the spacer 300 is one-fourth of the axial dimension of the magnet with the smallest axial dimension among the plurality of magnets. Specifically, the thickness of the spacer 300 is one-fourth of the axial dimension of the sub-magnet 120. This can make the spacer 300 have a reasonable thickness, ensure the magnetic isolation effect of the spacer 300, further optimize the magnetic circuit of the mover magnet assembly 10, and facilitate the improvement of the peak thrust of the compressor.

[0050] By comparing the mover with a single axial magnet in the related art with the mover magnet assembly 10 according to the embodiments of the present invention through a comparative experiment, as Figure 3 shown, Figure 3 a in shows the peak thrust of a compressor using the mover in the related art, Figure 3 b in shows the peak thrust of a compressor using the mover magnet assembly 10 according to the embodiments of the present invention. It can be seen that the peak thrust of the compressor using the mover magnet assembly 10 can be increased by 28% compared with that of the single-magnet compressor in the related art.

[0051] Specifically, the thickness of the plastic coating layer 200 is 1-3 mm. Preferably, the thickness is 2 mm here. This can improve the heat dissipation performance of the plastic coating layer 200 while ensuring its structural strength, and reduce the risk of magnet demagnetization.

[0052] The compressor rotor according to an embodiment of the present invention will be described below. The compressor rotor according to an embodiment of the present invention includes a rotor magnet assembly, a moving disk 20, and a piston 30.

[0053] The rotor magnet assembly is the rotor magnet assembly 10 according to the above embodiment of the present invention. The rotor magnet assembly 10 is connected to the moving disk 20. The piston 30 is connected to the moving disk 20.

[0054] The compressor rotor according to an embodiment of the present invention has the advantages of being stable and reliable, having low noise, low eddy current loss, good insulation, and high production efficiency by using the rotor magnet assembly 10 according to the above embodiment of the present invention.

[0055] Specifically, the rotor magnet assembly 10 is connected to the moving disk 20 by threaded fasteners. This can improve the connection strength and stability between the rotor magnet assembly 10 and the moving disk 20, and prevent the rotor magnet assembly 10 from generating vibration and noise.

[0056] The compressor according to an embodiment of the present invention will be described below. The compressor according to an embodiment of the present invention includes the compressor rotor according to the above embodiment of the present invention.

[0057] The compressor according to an embodiment of the present invention has the advantages of being stable and reliable, having low noise, low eddy current loss, good insulation, and high production efficiency by using the compressor rotor according to the above embodiment of the present invention.

[0058] Specifically, the compressor 1 further includes a housing 40, a yoke 50, a coil 60, a piston cylinder 70, and a leaf spring 80. The yoke 50 is provided on the radial inner side of the housing 40. The coil 60 is provided on the yoke 50. The piston cylinder 70 is provided on the radial inner side of the yoke 50. The piston 30 is axially movably provided in the piston cylinder 70. The leaf spring 80 is provided in the housing 40 and connected to the piston rod of the piston 30.

[0059] Next, reference is made to Figure 1 and Figure 2 to describe the production process of the compressor 1 according to an embodiment of the present invention.

[0060] The sub-magnet 120, the spacer 300, the main magnet 110, the spacer 300, and the sub-magnet 120 are sequentially placed into the injection mold to ensure correct positions;

[0061] The molten injection material is injected into the mold to coat the magnet and the spacer 300;

[0062] After the injection material cools and solidifies, the finished product is taken out;

[0063] The qualified finished products are transferred to the whole machine assembly process.

[0064] The mover magnet assembly 10 is connected to the moving disk 20 by screws;

[0065] The moving disk 20 and the piston rod of the piston 30 are locked and linked by nuts;

[0066] After the piston 30 is fitted with the piston cylinder 70, the piston rod of the piston 30 passes through the central hole of the leaf spring 80 and is locked and fixed to the leaf spring 80.

[0067] The other configurations and operations of the compressor 1 according to the embodiments of the present invention are known to those of ordinary skill in the art and will not be described in detail here.

[0068] In the description of this specification, the descriptions referring to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0069] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A mover magnet assembly, characterized in that: include: magnet; A plastic coating layer is coated on the outside of the magnet.

2. The mover magnet assembly according to claim 1, characterized in that: The magnets are multiple and are spaced apart along the axial direction of the mover magnet assembly, and the overmolding layer is overmolded outside the multiple magnets.

3. The mover magnet assembly according to claim 2, characterized in that: An isolation piece is provided between two adjacent magnets in the axial direction, and the isolation piece is made of a non-magnetic conductive material.

4. The mover magnet assembly according to claim 3, characterized in that: The thickness of the spacer is one quarter of the axial dimension of a magnet with the smallest axial dimension among the plurality of magnets.

5. The mover magnet assembly according to claim 3, characterized in that: The plastic coating layer is a ball-shaped film plastic part, and the isolation part is a carbon fiber material part.

6. The mover magnet assembly according to claim 1, characterized in that: The magnet comprises: Main magnet; Two auxiliary magnets, the main magnet is located between the two auxiliary magnets in the axial direction of the mover magnet assembly, and the axial dimension of the auxiliary magnet is smaller than the axial dimension of the main magnet.

7. The mover magnet assembly according to claim 6, characterized in that: The difference between the axial dimension of the auxiliary magnet and the axial dimension of the main magnet is 8-10 mm.

8. The mover magnet assembly according to claim 1, characterized in that: The thickness of the plastic coating layer is 1-3 mm.

9. A compressor mover, characterized in that: include: A mover magnet assembly, wherein the mover magnet assembly is a mover magnet assembly according to any one of claims 1 to 8; A moving plate, the mover magnet assembly being connected to the moving plate; A piston is connected to the moving plate.

10. The compressor mover according to claim 9, characterized in that: The mover magnet assembly is connected to the moving plate via threaded fasteners.

11. A compressor, characterized in that: Comprising the compressor mover according to claim 9 or 10.

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