Magnet assembly for magnetic refrigerator and magnetic refrigerator

Abstract

The invention discloses a magnet assembly for a magnetic refrigerator and the magnetic refrigerator. The magnet assembly for the magnetic refrigerator comprises a center magnet, a first magnetic assembly and a second magnetic assembly. The central magnet comprises a first central magnet unit, a second central magnet unit, a third central magnet unit and a fourth central magnet unit which are arranged along the circumferential direction of the central magnet and are adjacent in sequence; the first magnetic assembly comprises a first magnetic block, a second magnetic block and a first magnetizer; the second magnetic assembly comprises a third magnetic block, a fourth magnetic block and a second magnetizer; a first magnetic loop is formed between the first magnetic assembly and the central magnet and passes through the first gap and the second gap; and a second magnetic loop is formed between the second magnetic assembly and the central magnet, passes through the third gap and the fourth gap, and is opposite to the first magnetic loop in direction. According to the magnet assembly, the excitation and demagnetization times of the magnetic working medium in one period can be increased, and the refrigeration efficiency of the magnetic refrigerator is improved.

Description

Technical Field

[0001] The invention relates to a magnet assembly for a magnetic refrigerator and a magnetic refrigerator. Background Art

[0002] Currently, commercial refrigeration generally uses gas compression refrigeration, which requires the use of hydrofluorocarbons as refrigerants. Hydrofluorocarbons are greenhouse gases with a global warming potential thousands of times that of carbon dioxide.

[0003] Magnetic refrigeration technology uses solid magnetic fluid as refrigerant and environmentally friendly media such as water as heat transfer fluid. Compared with traditional gas compression refrigeration, magnetic refrigeration technology has the advantages of high energy efficiency, green environmental protection and reliable operation, and has received extensive research and attention. The Carnot cycle of magnetic refrigeration technology is significantly higher than that of gas compression refrigeration.

[0004] The research on magnetic refrigeration technology mainly includes the research and development of high thermal performance magnetic fluids, the development of magnetic field systems and the optimization of heat exchange systems. The magnetic field system is an important part of magnetic refrigeration technology. At present, the developed magnetic field systems mainly include superconductors and permanent magnetic circuits. Although superconductors can generate strong magnetic fields, their cost is too high, which limits their application. Reasonable permanent magnetic circuit design can meet the needs of magnetic refrigeration while reducing costs.

[0005] CN114484925B discloses a magnetic refrigerator, including a magnet. The magnet includes a first magnet, a second magnet, a fixed plate, and a driving mechanism. The magnetic field directions of the first magnet and the second magnet are the same. A first working space is provided in the middle of the first magnet, and a second working space is provided in the middle of the second magnet. The openings of the first working space and the second working space are opposite to each other, and the separation distance between the first working space and the second working space is a separation space. The first working space and the second working space separation space constitute the working space of the magnet. The bottoms of the first magnet and the second magnet are connected to the fixed plate, and the fixed plate and the driving mechanism are connected by gears. The driving mechanism is used to drive the fixed plate to reciprocate, thereby driving the first magnet and the second magnet to reciprocate. The magnetic refrigerator is a reciprocating magnetic refrigerator, which is not compact in structure and requires a large space.

[0006] CN211177504U discloses a double C magnetic field for a rotary room temperature magnetic refrigerator, including a yoke, a magnetic block array, and a rotating shaft. The yoke is an axisymmetric structure, with C-shaped structures arranged on both sides of the axis, the opening of the C-shaped structure is located on the side, and the rotating shaft is arranged at the axis position of the yoke. The magnet array is installed on the inner wall surface of the C-shaped structure, and the magnetic block array includes a plurality of magnetic monomers. The combined magnetic monomers form a magnetic field air gap on the inner side of the opening, and the position of the magnetic field air gap is opposite to the opening. The number of excitation and demagnetization of the magnetic working medium bed in one cycle is small, which is not conducive to improving the refrigeration efficiency.

[0007] CN206834014U discloses a permanent magnet assembly, including two magnet assemblies, the magnet assemblies including a connected central permanent magnet and a peripheral permanent magnet, at least two of the peripheral permanent magnets are distributed along the circumference of the central permanent magnet. There is a gap between the two magnet assemblies, the magnetization direction of the central permanent magnet of one magnet assembly points to the gap, and the magnetization direction of the central permanent magnet of the other magnet assembly deviates from the gap. In one magnet assembly, the magnetization direction of the peripheral permanent magnet points to the central permanent magnet, and in the other magnet assembly, the magnetization direction of the peripheral permanent magnet deviates from the central permanent magnet; any peripheral permanent magnet in one magnet assembly and the peripheral permanent magnet corresponding to the peripheral permanent magnet in the other magnet assembly, and the central permanent magnets of the two magnet assemblies form a magnet circuit, and the magnet circuit passes through the gap. The permanent magnet assembly can only make the magnetic medium undergo excitation and demagnetization once in one cycle. Summary of the invention

[0008] In view of this, one object of the present invention is to provide a magnet assembly for a magnetic refrigerator, which can increase the number of excitation and demagnetization of the magnetic medium in one cycle and improve the refrigeration efficiency of the magnetic refrigerator. Another object of the present invention is to provide a magnetic refrigerator.

[0009] The present invention achieves the above technical objectives through the following technical solutions.

[0010] In one aspect, the present invention provides a magnet assembly for a magnetic refrigerator, comprising a central magnet, a first magnetic assembly and a second magnetic assembly;

[0011] The central magnet comprises a first central magnet unit, a second central magnet unit, a third central magnet unit and a fourth central magnet unit which are arranged along the circumference of the central magnet and are adjacent to each other in sequence;

[0012] The first magnetic assembly includes a first magnetic block, a second magnetic block and a first magnetic conductor; the first magnetic block and the second magnetic block are arranged along the periphery of the first central magnet unit, a first gap is formed between the first magnetic block and the first central magnet unit, and a second gap is formed between the second magnetic block and the first central magnet unit; the first magnetic conductor is respectively fixed to a surface of the first magnetic block away from the central magnet and a surface of the second magnetic block away from the central magnet; a first magnetic circuit is formed between the first magnetic assembly and the central magnet, and the first magnetic circuit passes through the first gap and the second gap;

[0013] The second magnetic component includes a third magnetic block, a fourth magnetic block and a second magnetic conductor; the third magnetic block and the fourth magnetic block are arranged along the outer periphery of the third central magnet unit, a third gap is provided between the third magnetic block and the third central magnet unit, and a fourth gap is provided between the fourth magnetic block and the third central magnet unit; the second magnetic conductor is respectively fixed to the surface of the third magnetic block away from the central magnet and the surface of the fourth magnetic block away from the central magnet; a second magnetic circuit is formed between the second magnetic component and the central magnet, the second magnetic circuit passes through the third gap and the fourth gap, and the direction of the second magnetic circuit is opposite to that of the first magnetic circuit.

[0014] According to the magnet assembly for a magnetic refrigerator of the present invention, preferably, the outer surface of the central magnet located between the first magnetic block and the second magnetic block has a first recessed portion, the outer surface of the central magnet located between the second magnetic block and the third magnetic block has a second recessed portion, the outer surface of the central magnet located between the third magnetic block and the fourth magnetic block has a third recessed portion, and the outer surface of the central magnet located between the fourth magnetic block and the first magnetic block has a fourth recessed portion.

[0015] According to the magnet assembly for a magnetic refrigerator of the present invention, preferably, the first magnetic assembly further comprises a first magnetic conductive head and a second magnetic conductive head; the first magnetic conductive head comprises a first magnetic conductive head surface A and a first magnetic conductive head surface B which are arranged opposite to each other, and the first magnetic conductive head surface A is attached to the surface of the first magnetic block close to the central magnet; the second magnetic conductive head comprises a second magnetic conductive head surface A and a second magnetic conductive head surface B which are arranged opposite to each other, and the second magnetic conductive head surface A is attached to the surface of the second magnetic block close to the central magnet;

[0016] The second magnetic component also includes a third magnetic head and a fourth magnetic head; the third magnetic head has a third magnetic head surface A and a third magnetic head surface B that are relatively set, and the third magnetic head surface A is attached to the surface of the third magnetic block close to the center magnet; the fourth magnetic head has a fourth magnetic head surface A and a fourth magnetic head surface B that are relatively set, and the fourth magnetic head surface A is attached to the surface of the fourth magnetic block close to the center magnet.

[0017] According to the magnet assembly for a magnetic refrigerator of the present invention, preferably, the first magnetic head surface B is an inner concave surface, and the surface of the central magnet corresponding to the first magnetic head is an outer convex surface;

[0018] The second magnetic conductive head surface B is an inner concave surface, and the surface of the central magnet corresponding to the second magnetic conductive head is an outer convex surface;

[0019] The surface B of the third magnetic conductive head is an inner concave surface, and the surface of the central magnet corresponding to the third magnetic conductive head is an outer convex surface;

[0020] The fourth magnetic conductive head surface B is an inner concave surface, and the surface of the central magnet corresponding to the fourth magnetic conductive head is an outer convex surface.

[0021] According to the magnet assembly for a magnetic refrigerator of the present invention, preferably, the width of the first magnetic conductive head surface A is greater than the width of the first magnetic conductive head surface B, the width of the second magnetic conductive head surface A is greater than the width of the second magnetic conductive head surface B, the width of the third magnetic conductive head surface A is greater than the width of the third magnetic conductive head surface B, and the width of the fourth magnetic conductive head surface A is greater than the width of the fourth magnetic conductive head surface B.

[0022] According to the magnet assembly for a magnetic refrigerator of the present invention, preferably, the first magnetic block, the second magnetic block, the third magnetic block and the fourth magnetic block are uniformly dispersed in sequence along the circumference of the central magnet;

[0023] The first magnetic conductor includes a first magnetic conductor body and a first magnetic conductor connecting portion, the first magnetic conductor body is fixed to the first magnetic block, the first magnetic conductor connecting portion is fixed to the second magnetic block, and the first magnetic conductor body and the first magnetic conductor connecting portion are substantially perpendicular;

[0024] The second magnetic conductor includes a second magnetic conductor body and a second magnetic conductor connecting portion. The second magnetic conductor body is fixed to the third magnetic block, the second magnetic conductor connecting portion is fixed to the fourth magnetic block, and the second magnetic conductor body and the second magnetic conductor connecting portion are substantially perpendicular.

[0025] According to the magnet assembly for a magnetic refrigerator of the present invention, preferably, the first magnetic block and the third magnetic block have the same magnetization direction, and the second magnetic block and the fourth magnetic block have the same magnetization direction.

[0026] According to the magnet assembly for a magnetic refrigerator of the present invention, preferably, the magnetization directions of the first magnetic block and the fourth magnetic block are perpendicular to each other;

[0027] |α-β|≤10°; wherein α represents the angle between the magnetization direction of the first magnetic block and the magnetization direction of the central magnet, and β represents the angle between the magnetization direction of the fourth magnetic block and the magnetization direction of the central magnet.

[0028] On the other hand, the present invention provides a magnetic refrigerator, comprising the magnet assembly for the magnetic refrigerator.

[0029] According to the magnetic refrigerator of the present invention, preferably, the magnetic refrigerator further comprises a magnetic working medium, and the magnetic working medium and the magnet assembly for the magnetic refrigerator can rotate relatively along a path passing through the first gap, the second gap, the third gap and the fourth gap.

[0030] The magnet assembly for a magnetic refrigerator of the present invention can increase the number of excitation and demagnetization of the magnetic medium in one cycle, thereby improving the refrigeration efficiency of the magnetic refrigerator. Furthermore, the magnet assembly of the present invention has a large magnetic flux density. Furthermore, the magnet assembly of the present invention has a compact structure and requires a small space. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 The figure is a schematic structural diagram of a magnet assembly for a magnetic refrigerator according to the present invention.

[0032] Figure 2 The figure is a schematic diagram of the magnetic field distribution of a magnet assembly for a magnetic refrigerator according to the present invention.

[0033] The reference numerals are as follows:

[0034] 1-center magnet; 201-first magnetic block; 202-second magnetic block; 203-first conductive magnet; 204-first conductive head; 205-second conductive head; 301-third magnetic block; 302-fourth magnetic block; 303-second conductive magnet; 304-third conductive head; 305-fourth conductive head. DETAILED DESCRIPTION

[0035] The present invention is further described below in conjunction with specific embodiments, but the protection scope of the present invention is not limited thereto.

[0036] Unless otherwise stated, the magnets mentioned in this application are permanent magnets.

[0037] <Magnetic Components for Magnetic Refrigerator>

[0038] The magnet assembly for a magnetic refrigerator of the present invention comprises a central magnet, a first magnetic assembly and a second magnetic assembly. The structures of the components are described in detail below.

[0039] Center magnet

[0040] The central magnet of the present invention comprises a first central magnet unit, a second central magnet unit, a third central magnet unit and a fourth central magnet unit. The first central magnet unit, the second central magnet unit, the third central magnet unit and the fourth central magnet unit are arranged along the circumference of the central magnet. The first central magnet unit, the second central magnet unit, the third central magnet unit and the fourth central magnet unit are adjacent in sequence. The first central magnet unit, the second central magnet unit, the third central magnet unit and the fourth central magnet unit constitute the central magnet.

[0041] The central magnet is an integrated structure. The central magnet can be substantially a rectangular parallelepiped or substantially a cylindrical body. The central magnet can be a NdFeB magnet or a SmCo magnet.

[0042] The outer surface of the central magnet located between the first magnetic block and the second magnetic block may have a first recessed portion. The outer surface of the central magnet located between the second magnetic block and the third magnetic block may have a second recessed portion. The outer surface of the central magnet located between the third magnetic block and the fourth magnetic block may have a third recessed portion. The outer surface of the central magnet located between the fourth magnetic block and the first magnetic block may have a fourth recessed portion.

[0043] In the present invention, |α-β|≤10°; preferably, |α-β|≤5°; more preferably, |α-β|≤1°. α represents the angle between the magnetization direction of the first magnetic block and the magnetization direction of the central magnet. β represents the angle between the magnetization direction of the fourth magnetic block and the magnetization direction of the central magnet. In some embodiments, the angle between the magnetization direction of the central magnet and the magnetization direction of the first magnetic block is 45°. The angle between the magnetization direction of the central magnet and the magnetization direction of the fourth magnetic block is 45°.

[0044] First magnetic component

[0045] The first magnetic assembly of the present invention surrounds the outer periphery of the first central magnetic unit. The first magnetic assembly includes a first magnetic block, a second magnetic block and a first magnetic conductor. In some embodiments, the first magnetic assembly also includes a first magnetic conductor head and a second magnetic conductor head.

[0046] The first magnetic block of the present invention is arranged at the periphery of the first central magnet unit. There is a first gap between the first magnetic block and the first central magnet unit. The first magnetic block can be in the shape of a rectangular parallelepiped. The length direction of the first magnetic block is arranged along the axial direction of the central magnet. The first magnetic block can be a NdFeB magnet or a SmCo magnet.

[0047] The second magnetic block of the present invention is arranged at the periphery of the second central magnet unit. A second gap is provided between the second magnetic block and the second central magnet unit. The second magnetic block may be in the shape of a rectangular parallelepiped. The length direction of the second magnetic block is arranged along the axial direction of the central magnet. The second magnetic block may be a NdFeB magnet or a SmCo magnet.

[0048] The first magnetic conductor of the present invention is respectively fixed to the surface of the first magnetic block away from the central magnet and the surface of the second magnetic block away from the central magnet. The first magnetic conductor may include a first magnetic conductor body and a first magnetic conductor connecting portion. The first magnetic conductor body is fixed to the first magnetic block, and the first magnetic conductor connecting portion is fixed to the second magnetic block.

[0049] Specifically, one end of the first magnetic body is connected to one end of the first magnetic connection part, the other end of the first magnetic body is a free end, and the other end of the first magnetic connection part is a free end. The first magnetic body is substantially perpendicular to the first magnetic connection part. The first magnetic body is "L" shaped. The first magnetic block is fixed to the surface of the first magnetic body close to the center magnet. The first magnetic block is disposed near the free end of the first magnetic body. The second magnetic block is fixed to the surface of the first magnetic connection part close to the center magnet. The second magnetic block is disposed near the free end of the first magnetic connection part. The first magnetic body may be low carbon steel. For example, low carbon 1010 steel.

[0050] The first magnetic head of the present invention has a first magnetic head surface A and a first magnetic head surface B which are arranged opposite to each other, and the first magnetic head surface A is attached to the surface of the first magnetic block close to the central magnet. In some embodiments, the first magnetic head surface B is an inner concave surface. Specifically, the first magnetic head surface B is an arc-shaped inner concave surface. The surface of the central magnet corresponding to the first magnetic head is an outer convex surface; preferably, the curvature of the outer convex surface matches the curvature of the first magnetic head surface B. The first magnetic head does not contact the central magnet. The width of the first magnetic head surface A is greater than the width of the first magnetic head surface B. The first magnetic head can be low carbon steel. For example, low carbon 1010 steel. This can increase the magnetic flux passing through the first gap.

[0051] The second magnetic head of the present invention has a second magnetic head surface A and a second magnetic head surface B which are arranged opposite to each other, and the second magnetic head surface A is attached to the surface of the second magnetic block close to the central magnet. In some embodiments, the second magnetic head surface B is an inner concave surface. Specifically, the second magnetic head surface B is an arc-shaped inner concave surface. The surface of the central magnet corresponding to the second magnetic head is an outer convex surface; preferably, the curvature of the outer convex surface matches the curvature of the second magnetic head surface B. The second magnetic head does not contact the central magnet. The width of the second magnetic head surface A is greater than the width of the second magnetic head surface B. The second magnetic head can be low carbon steel. For example, low carbon 1010 steel. This can increase the magnetic flux passing through the second gap.

[0052] A first magnetic circuit is formed between the first magnetic component and the central magnet, and the first magnetic circuit passes through the first gap and the second gap. The direction of the first magnetic circuit can be clockwise. The angle between the magnetization directions of the first magnet and the second magnet can be 90°.

[0053] Second magnetic component

[0054] The second magnetic assembly of the present invention surrounds the outer periphery of the third central magnetic unit. The second magnetic assembly includes a third magnetic block, a fourth magnetic block and a second magnetic conductor. In some embodiments, the second magnetic assembly also includes a third magnetic conductor head and a fourth magnetic conductor head.

[0055] The third magnetic block of the present invention is arranged at the periphery of the third central magnet unit. There is a third gap between the third magnetic block and the third central magnet unit. The third magnetic block can be in the shape of a rectangular parallelepiped. The length direction of the third magnetic block is arranged along the axial direction of the central magnet. The third magnetic block can be a NdFeB magnet or a SmCo magnet.

[0056] The fourth magnetic block of the present invention is arranged at the periphery of the third central magnet unit. A fourth gap is provided between the fourth magnetic block and the third central magnet unit. The fourth magnetic block may be in the shape of a rectangular parallelepiped. The length direction of the fourth magnetic block is arranged along the axial direction of the central magnet. The fourth magnetic block may be a NdFeB magnet or a SmCo magnet.

[0057] The second magnetic conductor of the present invention is respectively fixed to the surface of the third magnetic block away from the central magnet and the surface of the fourth magnetic block away from the central magnet. The second magnetic conductor may include a second magnetic conductor body and a second magnetic conductor connecting portion. The second magnetic conductor body is fixed to the third magnetic block, and the second magnetic conductor connecting portion is fixed to the fourth magnetic block.

[0058] Specifically, one end of the second magnetic body is connected to one end of the second magnetic connection part, the other end of the second magnetic body is a free end, and the other end of the second magnetic connection part is a free end. The second magnetic body is substantially perpendicular to the second magnetic connection part. The second magnetic body is in an "L" shape. The third magnetic block is fixed to the surface of the second magnetic body close to the center magnet. The third magnetic block is disposed near the free end of the second magnetic body. The fourth magnetic block is fixed to the surface of the second magnetic connection part close to the center magnet. The fourth magnetic block is disposed near the free end of the second magnetic connection part. The second magnetic conductor may be low carbon steel. For example, low carbon 1010 steel.

[0059] The third magnetic head of the present invention has a third magnetic head surface A and a third magnetic head surface B which are arranged opposite to each other. The third magnetic head surface A is attached to the surface of the third magnetic block close to the central magnet. In some embodiments, the third magnetic head surface B is a concave surface. Specifically, the third magnetic head surface B is an arc-shaped concave surface. The surface of the central magnet corresponding to the third magnetic head is an outer convex surface; preferably, the curvature of the outer convex surface matches the curvature of the third magnetic head surface B. The third magnetic head does not contact the central magnet. The width of the third magnetic head surface A is greater than the width of the third magnetic head surface B. The third magnetic head can be low carbon steel. For example, low carbon 1010 steel. This can increase the magnetic flux passing through the third gap.

[0060] The fourth magnetic head of the present invention has a fourth magnetic head surface A and a fourth magnetic head surface B which are arranged opposite to each other, and the fourth magnetic head surface A is attached to the surface of the fourth magnetic block close to the central magnet. In some embodiments, the fourth magnetic head surface B is an inner concave surface. Specifically, the fourth magnetic head surface B is an arc-shaped inner concave surface. The surface of the central magnet corresponding to the fourth magnetic head is an outer convex surface; preferably, the curvature of the outer convex surface matches the curvature of the fourth magnetic head surface B. The fourth magnetic head does not contact the central magnet. The width of the fourth magnetic head surface A is greater than the width of the fourth magnetic head surface B. The second magnetic head can be low carbon steel. For example, low carbon 1010 steel. This can increase the magnetic flux passing through the fourth gap.

[0061] A second magnetic circuit is formed between the second magnetic component and the central magnet, and the second magnetic circuit passes through the third gap and the fourth gap. The direction of the second magnetic circuit is opposite to the direction of the first magnetic circuit. The direction of the second magnetic circuit can be counterclockwise. The angle between the magnetization directions of the third magnet and the fourth magnet can be 90°.

[0062] In the present invention, the first magnetic block, the second magnetic block, the third magnetic block and the fourth magnetic block are uniformly dispersed in sequence along the circumference of the central magnet. The magnetization directions of the first magnetic block and the third magnetic block are the same, and the magnetization directions of the second magnetic block and the fourth magnetic block are the same. The angle between the magnetization direction of the first magnetic block and the magnetization direction of the fourth magnetic block is 90°.

[0063] <Magnetic Refrigerator>

[0064] The magnetic refrigerator of the present invention includes the aforementioned magnet assembly for magnetic refrigerator. The magnetic refrigerator may also include a magnetic working medium. The magnetic working medium and the magnet assembly for magnetic refrigerator can rotate relative to each other along a path passing through the first gap, the second gap, the third gap, and the fourth gap. In some embodiments, the magnetic working medium and the magnet assembly for magnetic refrigerator can rotate relative to each other along a path passing through the first gap, the first recessed portion, the second gap, the second recessed portion, the third gap, the third recessed portion, the fourth gap, and the fourth recessed portion. The direction of relative rotation of the magnetic working medium and the magnet assembly is not limited. For example, the magnetic working medium can rotate clockwise relative to the magnet assembly. For another example, the magnetic working medium can rotate counterclockwise relative to the magnet assembly.

[0065] Example 1

[0066] like Figure 1 As shown, the magnet assembly for a magnetic refrigerator in this embodiment includes a central magnet 1, a first magnetic assembly and a second magnetic assembly.

[0067] The central magnet 1 includes a first central magnet unit, a second central magnet unit, a third central magnet unit and a fourth central magnet unit which are arranged circumferentially of the central magnet 1 and are adjacent to each other in sequence. The first central magnet unit, the second central magnet unit, the third central magnet unit and the fourth central magnet unit constitute the central magnet 1. The central magnet 1 is an integral structure. The central magnet 1 is a NdFeB magnet. The central magnet 1 is generally cylindrical.

[0068] The first magnetic assembly surrounds the outer periphery of the first central magnetic unit and includes a first magnetic block 201 , a second magnetic block 202 , a first magnetic conductor 203 , a first magnetic conductor head 204 and a second magnetic conductor head 205 .

[0069] The first magnetic block 201 is arranged at the periphery of the first central magnet unit and has a first gap with the first central magnet unit. The first magnetic block 201 is in a rectangular parallelepiped shape. The length direction of the first magnetic block 201 is arranged along the axial direction of the central magnet 1. The first magnetic block 201 is a NdFeB magnet.

[0070] The first magnetic conductive head 204 has a first magnetic conductive head surface A and a first magnetic conductive head surface B which are arranged opposite to each other. The first magnetic conductive head surface A is attached to the surface of the first magnetic block 201 close to the central magnet 1. The first magnetic conductive head surface B is an arc-shaped inner concave surface. The width of the first magnetic conductive head surface A ( Figure 1 The length in the Y-axis direction) is greater than the width of the first magnetic head surface B ( Figure 1 The first magnetic head 204 is made of low carbon 1010 steel.

[0071] The surface of the central magnet 1 corresponding to the first magnetic conductive head 204 is an arc-shaped outer convex surface, and the curvature of the arc matches the curvature of the surface B of the first magnetic conductive head.

[0072] The second magnetic block 202 is arranged at the periphery of the first central magnet unit and has a second gap with the first central magnet unit. The second magnetic block 202 is in a rectangular shape. The length direction of the second magnetic block 202 is arranged along the axial direction of the central magnet 1. The second magnetic block 202 is a NdFeB magnet.

[0073] The second magnetic conductive head 205 has a second magnetic conductive head surface A and a second magnetic conductive head surface B which are arranged opposite to each other. The second magnetic conductive head surface A is attached to the surface of the second magnetic block 202 close to the central magnet 1. The second magnetic conductive head surface B is an arc-shaped inner concave surface. The width of the second magnetic conductive head surface A ( Figure 1 The length in the X-axis direction) is greater than the width of the second magnetic conductive head surface B ( Figure 1 The second magnetic head 205 is made of low carbon 1010 steel.

[0074] The surface of the central magnet 1 corresponding to the second magnetic conductive head 205 is an arc-shaped outer convex surface, and the curvature of the arc matches the curvature of the surface B of the second magnetic conductive head.

[0075] The first magnetizer 203 includes a first magnetizer body and a first magnetizer connection portion. One end of the first magnetizer body is connected to one end of the first magnetizer connection portion, the other end of the first magnetizer body is a free end, and the other end of the first magnetizer connection portion is a free end. The first magnetizer body is substantially perpendicular to the first magnetizer connection portion. The first magnetizer 203 is "L" shaped. The first magnetizer 203 is low carbon 1010 steel.

[0076] The surface of the first magnetic block 201 away from the central magnet 1 (the surface opposite to the surface close to the central magnet 1) is fixed to the surface of the first magnetic conductive body close to the central magnet 1. The first magnetic block 201 is arranged near the free end of the first magnetic conductive body.

[0077] The surface of the second magnetic block 202 away from the central magnet 1 (the surface opposite to the surface close to the central magnet 1) is fixed to the surface of the first magnetic conductive connecting part close to the central magnet 1. The second magnetic block 202 is arranged near the free end of the first magnetic conductive connecting part.

[0078] The second magnetic assembly surrounds the outer periphery of the third central magnetic unit and includes a third magnetic block 301 , a fourth magnetic block 302 , a second magnetic conductor 303 , a third magnetic conductor head 304 and a fourth magnetic conductor head 305 .

[0079] The third magnetic block 301 is arranged at the periphery of the third central magnet unit and has a third gap with the third central magnet unit. The third magnetic block 301 is in a rectangular shape. The length direction of the third magnetic block 301 is arranged along the axial direction of the central magnet 1. The third magnetic block 301 is a NdFeB magnet.

[0080] The third magnetic conductive head 304 has a third magnetic conductive head surface A and a third magnetic conductive head surface B which are arranged opposite to each other. The third magnetic conductive head surface A is attached to the surface of the third magnetic block 301 close to the central magnet 1. The third magnetic conductive head surface B is an arc-shaped inner concave surface. The width of the third magnetic conductive head surface A ( Figure 1 The length in the Y-axis direction) is greater than the width of the third magnetic head surface B ( Figure 1 The third magnetic head 304 is made of low carbon 1010 steel.

[0081] The surface of the central magnet 1 corresponding to the third magnetic conductive head 304 is an arc-shaped outer convex surface, and the curvature of the arc matches the curvature of the surface B of the third magnetic conductive head.

[0082] The fourth magnetic block 302 is arranged at the periphery of the third central magnet unit and has a fourth gap with the third central magnet unit. The fourth magnetic block 302 is in a rectangular shape. The length direction of the fourth magnetic block 302 is arranged along the axial direction of the central magnet 1. The fourth magnetic block 302 is a NdFeB magnet.

[0083] The fourth magnetic conductive head 305 has a fourth magnetic conductive head surface A and a fourth magnetic conductive head surface B which are arranged opposite to each other. The fourth magnetic conductive head surface A is attached to the surface of the fourth magnetic block 302 close to the central magnet 1. The fourth magnetic conductive head surface B is an arc-shaped inner concave surface. The width of the fourth magnetic conductive head surface A ( Figure 1 The length in the X-axis direction) is greater than the width of the fourth magnetic conductive head surface B ( Figure 1 The fourth magnetic head 305 is made of low carbon 1010 steel.

[0084] The surface of the central magnet 1 corresponding to the fourth magnetic conductive head 305 is an arc-shaped convex surface, and the curvature of the arc matches the curvature of the surface B of the fourth magnetic conductive head.

[0085] The second magnetizer 303 includes a second magnetizer body and a second magnetizer connecting portion. One end of the second magnetizer body is connected to one end of the second magnetizer connecting portion, the other end of the second magnetizer body is a free end, and the other end of the second magnetizer connecting portion is a free end. The second magnetizer body is substantially perpendicular to the second magnetizer connecting portion. The second magnetizer 303 is "L" shaped. The second magnetizer 303 is low carbon 1010 steel.

[0086] The surface of the third magnetic block 301 away from the central magnet 1 (the surface opposite to the surface close to the central magnet 1) is fixed to the surface of the second magnetic conductive body close to the central magnet 1. The third magnetic block 301 is arranged near the free end of the second magnetic conductive body.

[0087] The surface of the fourth magnetic block 302 away from the central magnet 1 (the surface opposite to the surface close to the central magnet 1) is fixed to the surface of the second magnetic conductive connecting part close to the central magnet 1. The fourth magnetic block 302 is arranged near the free end of the second magnetic conductive connecting part.

[0088] The first magnetic block 201 , the second magnetic block 202 , the third magnetic block 301 and the fourth magnetic block 302 are uniformly dispersed in sequence along the circumference of the central magnet 1 .

[0089] The outer surface of the central magnet 1 located between the first magnetic block 201 and the second magnetic block 202 has a first recessed portion. The outer surface of the central magnet 1 located between the second magnetic block 202 and the third magnetic block 301 has a second recessed portion. The outer surface of the central magnet located between the third magnetic block 301 and the fourth magnetic block 302 has a third recessed portion. The outer surface of the central magnet 1 located between the fourth magnetic block 302 and the first magnetic block 201 has a fourth recessed portion.

[0090] A first magnetic circuit is formed between the first magnetic component and the central magnet 1, and the first magnetic circuit passes through the first gap and the second gap. A second magnetic circuit is formed between the second magnetic component and the central magnet 1, and the second magnetic circuit passes through the third gap and the fourth gap. The directions of the first magnetic circuit and the second magnetic circuit are opposite. In this embodiment, the direction of the first magnetic circuit is clockwise, and the direction of the second magnetic circuit is counterclockwise.

[0091] like Figure 2 As shown, in this embodiment, the magnetizing directions of the first magnetic block 201 and the third magnetic block 301 are the same, which is the negative direction of the X axis. The magnetizing directions of the second magnetic block 202 and the fourth magnetic block 302 are the same, which is the negative direction of the Y axis. The angle between the magnetizing direction of the central magnet 1 and the magnetizing direction of the first magnetic block 201 is 45°. The angle between the magnetizing direction of the central magnet 1 and the magnetizing direction of the fourth magnetic block 302 is 45°.

[0092] During use, the magnetic medium rotates around the central magnet 1; when it passes through the first gap, it undergoes the first excitation; when it passes through the first recessed portion, it undergoes the first demagnetization; when it passes through the second gap, it undergoes the second excitation; when it passes through the second recessed portion, it undergoes the second demagnetization; when it passes through the third gap, it undergoes the third excitation; when it passes through the third recessed portion, it undergoes the third demagnetization; when it passes through the fourth gap, it undergoes the fourth excitation; when it passes through the fourth recessed portion, it undergoes the fourth demagnetization. In one cycle, it undergoes four excitations and demagnetizations in total.

[0093] Example 2

[0094] The magnetic refrigerator of this embodiment includes the magnetic refrigerator magnet assembly and the magnetic working medium of Embodiment 1. The magnetic working medium and the magnetic refrigerator magnet assembly can rotate relatively along a path passing through the first gap, the first recessed portion, the second gap, the second recessed portion, the third gap, the third recessed portion, the fourth gap and the fourth recessed portion.

[0095] The present invention is not limited to the above-mentioned embodiments. Without departing from the essential content of the present invention, any deformation, improvement and substitution that can be conceived by those skilled in the art shall fall within the scope of the present invention.

Claims

1. A magnet assembly for a magnetic refrigerator, characterized in that: The magnet assembly includes a central magnet, a first magnetic assembly and a second magnetic assembly; The central magnet comprises a first central magnet unit, a second central magnet unit, a third central magnet unit and a fourth central magnet unit which are arranged along the circumference of the central magnet and are adjacent to each other in sequence; The first magnetic assembly includes a first magnetic block, a second magnetic block and a first magnetic conductor; the first magnetic block and the second magnetic block are arranged along the periphery of the first central magnet unit, a first gap is formed between the first magnetic block and the first central magnet unit, and a second gap is formed between the second magnetic block and the first central magnet unit; the first magnetic conductor is respectively fixed to a surface of the first magnetic block away from the central magnet and a surface of the second magnetic block away from the central magnet; a first magnetic circuit is formed between the first magnetic assembly and the central magnet, and the first magnetic circuit passes through the first gap and the second gap; The second magnetic component includes a third magnetic block, a fourth magnetic block and a second magnetic conductor; the third magnetic block and the fourth magnetic block are arranged along the outer periphery of the third central magnet unit, a third gap is provided between the third magnetic block and the third central magnet unit, and a fourth gap is provided between the fourth magnetic block and the third central magnet unit; the second magnetic conductor is respectively fixed to the surface of the third magnetic block away from the central magnet and the surface of the fourth magnetic block away from the central magnet; a second magnetic circuit is formed between the second magnetic component and the central magnet, the second magnetic circuit passes through the third gap and the fourth gap, and the direction of the second magnetic circuit is opposite to that of the first magnetic circuit.

2. The magnet assembly for a magnetic refrigerator according to claim 1, characterized in that: The outer surface of the central magnet located between the first and second magnetic blocks has a first recessed portion, the outer surface of the central magnet located between the second and third magnetic blocks has a second recessed portion, the outer surface of the central magnet located between the third and fourth magnetic blocks has a third recessed portion, and the outer surface of the central magnet located between the fourth and first magnetic blocks has a fourth recessed portion.

3. The magnet assembly for a magnetic refrigerator according to claim 1, characterized in that: The first magnetic assembly further includes a first magnetic conductive head and a second magnetic conductive head; the first magnetic conductive head has a first magnetic conductive head surface A and a first magnetic conductive head surface B which are arranged opposite to each other, and the first magnetic conductive head surface A is attached to the surface of the first magnetic block close to the central magnet; the second magnetic conductive head has a second magnetic conductive head surface A and a second magnetic conductive head surface B which are arranged opposite to each other, and the second magnetic conductive head surface A is attached to the surface of the second magnetic block close to the central magnet; The second magnetic component also includes a third magnetic head and a fourth magnetic head; the third magnetic head has a third magnetic head surface A and a third magnetic head surface B that are relatively set, and the third magnetic head surface A is attached to the surface of the third magnetic block close to the center magnet; the fourth magnetic head has a fourth magnetic head surface A and a fourth magnetic head surface B that are relatively set, and the fourth magnetic head surface A is attached to the surface of the fourth magnetic block close to the center magnet.

4. The magnet assembly for a magnetic refrigerator according to claim 3, characterized in that: The first magnetic conductive head surface B is an inner concave surface, and the surface of the central magnet corresponding to the first magnetic conductive head is an outer convex surface; The second magnetic conductive head surface B is an inner concave surface, and the surface of the central magnet corresponding to the second magnetic conductive head is an outer convex surface; The surface B of the third magnetic conductive head is an inner concave surface, and the surface of the central magnet corresponding to the third magnetic conductive head is an outer convex surface; The fourth magnetic conductive head surface B is an inner concave surface, and the surface of the central magnet corresponding to the fourth magnetic conductive head is an outer convex surface.

5. The magnet assembly for a magnetic refrigerator according to claim 4, characterized in that: The width of the first magnetic conductive head surface A is greater than the width of the first magnetic conductive head surface B, the width of the second magnetic conductive head surface A is greater than the width of the second magnetic conductive head surface B, the width of the third magnetic conductive head surface A is greater than the width of the third magnetic conductive head surface B, and the width of the fourth magnetic conductive head surface A is greater than the width of the fourth magnetic conductive head surface B.

6. The magnet assembly for a magnetic refrigerator according to claim 1, characterized in that: The first magnetic block, the second magnetic block, the third magnetic block and the fourth magnetic block are uniformly dispersed in sequence along the circumference of the central magnet; The first magnetic conductor includes a first magnetic conductor body and a first magnetic conductor connecting portion, the first magnetic conductor body is fixed to the first magnetic block, the first magnetic conductor connecting portion is fixed to the second magnetic block, and the first magnetic conductor body and the first magnetic conductor connecting portion are substantially perpendicular; The second magnetic conductor includes a second magnetic conductor body and a second magnetic conductor connecting portion. The second magnetic conductor body is fixed to the third magnetic block, the second magnetic conductor connecting portion is fixed to the fourth magnetic block, and the second magnetic conductor body and the second magnetic conductor connecting portion are substantially perpendicular.

7. The magnet assembly for a magnetic refrigerator according to claim 1, characterized in that: The first magnetic block and the third magnetic block have the same magnetization direction, and the second magnetic block and the fourth magnetic block have the same magnetization direction.

8. The magnet assembly for a magnetic refrigerator according to claim 7, characterized in that: The magnetization directions of the first magnetic block and the fourth magnetic block are perpendicular to each other; |α-β|≤10°; wherein α represents the angle between the magnetization direction of the first magnetic block and the magnetization direction of the central magnet, and β represents the angle between the magnetization direction of the fourth magnetic block and the magnetization direction of the central magnet.

9. A magnetic refrigerator, characterized in that: The magnetic refrigerator comprises the magnet assembly for a magnetic refrigerator according to any one of claims 1 to 8.

10. The magnetic refrigerator according to claim 9, characterized in that: The magnetic refrigerator further comprises a magnetic working medium, and the magnetic working medium and the magnet assembly for the magnetic refrigerator can rotate relatively along a path passing through the first gap, the second gap, the third gap and the fourth gap.

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