Active magnetic regenerator based on composite intercalation structure and room temperature magnetic refrigeration system

Abstract

The application relates to the technical field of room-temperature magnetic refrigeration, in particular to an active magnetic regenerator based on a composite intercalation structure and a room-temperature magnetic refrigeration system. The active magnetic regenerator comprises a regenerator shell and a magnetocaloric unit, the magnetocaloric unit is arranged in the interior of the regenerator shell, and comprises a plurality of composite intercalation magnetocaloric plates; the plurality of composite intercalation magnetocaloric plates are arranged at intervals, and a fluid flow channel is formed between two adjacent composite intercalation magnetocaloric plates. By inserting a low-thermal-conductivity insulating layer into the magnetocaloric plate and arranging a high-thermal-conductivity layer at the end of the plate, a composite intercalation magnetocaloric plate structure is formed, the anisotropic heat transfer characteristic of the ideal regenerator, i.e. the radial high-thermal-conductivity and the axial low-thermal-conductivity, is realized without depending on special materials, the axial heat conduction loss of the regenerator is significantly reduced, the utilization rate of the magnetocaloric effect is improved, and the refrigeration performance of the regenerator is improved.

Description

Technical Field

[0001] This invention relates to the field of room temperature magnetic refrigeration technology, and in particular to an active magnetic regenerator and a room temperature magnetic refrigeration system based on a composite intercalation structure. Background Technology

[0002] Magnetic refrigeration technology, based on the magnetocaloric effect, boasts advantages such as high energy efficiency, zero greenhouse gas emissions, and environmental friendliness, and is considered an important development direction to replace traditional vapor compression refrigeration. Among them, the active magnetic regenerator (AMR) is the core component of the magnetic refrigeration system, and its heat transfer performance and structural form directly determine the system's refrigeration power density, temperature range, and energy efficiency level.

[0003] Among existing AMR (Automatic Regenerator) structures, flat-plate regenerators are widely used due to their regular geometry, ease of manufacturing, good flow controllability, and low viscous loss. However, compared to granular bed or packed bed regenerators, flat-plate regenerators generally suffer from lower cooling performance, mainly due to the following reasons: Theoretical studies have shown that an ideal regenerator structure should possess anisotropic thermal conductivity characteristics of "high radial thermal conductivity and low axial thermal conductivity," which can enhance solid-fluid heat transfer while suppressing axial heat leakage caused by the temperature difference between the hot and cold ends. However, magnetocaloric materials that simultaneously satisfy this extreme anisotropic characteristic are almost non-existent in natural materials.

[0004] In existing technologies, one approach seeks a performance trade-off by selecting a single solid material and adjusting its isotropic thermal conductivity parameters, but it is still difficult to simultaneously enhance heat transfer and suppress axial heat loss. Another approach inserts a low thermal conductivity insulating layer into the flat plate structure to reduce axial heat transfer, but this method often significantly increases the thermal resistance on the solid side, thereby weakening radial heat transfer efficiency and limiting the overall performance improvement. Summary of the Invention

[0005] This invention provides an active magnetic regenerator based on a composite intercalation structure to solve the problem that existing technologies cannot achieve the anisotropic thermal conductivity characteristics of "high radial thermal conductivity and low axial thermal conductivity".

[0006] This invention provides an active magnetic regenerator based on a composite intercalation structure, comprising: Regenerator casing; A magnetocalor unit, disposed inside the regenerator shell, includes multiple composite intercalated magnetocaloric plates, which are spaced apart and form a fluid flow channel between adjacent plates. Each composite intercalated magnetocaloric plate includes multiple magnetocaloric material layers, multiple low thermal conductivity insulating layers, and at least one high thermal conductivity layer. The multiple magnetocaloric material layers are spaced apart along the length of the composite intercalated magnetocaloric plate, and the multiple low thermal conductivity insulating layers are correspondingly disposed between adjacent magnetocaloric material layers. The high thermal conductivity layer is disposed on one side of the magnetocaloric material layer near the end of the composite intercalated magnetocaloric plate.

[0007] According to the present invention, an active magnetic regenerator based on a composite intercalation structure is provided, wherein the magnetocaloric material layer and the low thermal conductivity insulating layer are bonded by diffusion welding or thermocompression bonding, and the high thermal conductivity layer and the magnetocaloric material layer are bonded by diffusion welding or thermocompression bonding.

[0008] An active magnetic regenerator based on a composite intercalation structure provided by the present invention further includes: A support frame, made of a non-magnetic material, is disposed between two adjacent composite intercalated magnetothermal plates.

[0009] According to the present invention, an active magnetic regenerator based on a composite intercalation structure is provided, wherein the length of the magnetic thermal material layer is 100.00-150.00 mm and the thickness of the magnetic thermal material layer is 0.25-0.75 mm.

[0010] According to the present invention, an active magnetic regenerator based on a composite intercalation structure is provided, wherein the length of the low thermal conductivity insulation layer is 0.10-1.00 mm and the thickness of the low thermal conductivity insulation layer is 0.25-0.75 mm.

[0011] According to the present invention, an active magnetic regenerator based on a composite intercalation structure is provided, wherein the length of the high thermal conductivity layer is 1.00-25.00 mm and the thickness of the high thermal conductivity layer is 0.25-0.75 mm.

[0012] According to the present invention, an active magnetic regenerator based on a composite intercalation structure is provided, wherein the thickness of the fluid flow channel is 0.15-0.50 mm.

[0013] This invention also provides a room temperature magnetic refrigeration system, comprising a piston drive assembly, a hydraulic piston, a high-temperature end heat exchanger, a low-temperature end heat exchanger, connecting pipes, a magnet, a magnet drive assembly, and an active magnetic regenerator as described in any one of the above. The piston drive assembly is connected to the hydraulic piston, the active magnetic regenerator is disposed inside the magnet, and the magnet drive assembly is connected to the magnet. The connecting pipes include a first main pipe, a second main pipe, a first branch pipe, and a second branch pipe. One end of the first main pipe is connected to a cylinder of the hydraulic piston, and the other end of the first main pipe is connected to an outlet at one end of the regenerator shell. The high-temperature end heat exchanger is connected in series with the first main pipe. A first check valve is provided at the other end of the first main pipeline; one end of the first branch is connected to one end of the first main pipeline, and a second check valve is provided at one end of the first branch; the other end of the first branch is connected to the inlet at one end of the regenerator shell; one end of the second main pipeline is connected to the other cylinder of the hydraulic piston, and the other end of the second main pipeline is connected to the outlet at the other end of the regenerator shell; the low-temperature heat exchanger is connected in series with the second main pipeline, and a third check valve is provided at the other end of the second main pipeline; one end of the second branch is connected to one end of the second main pipeline, and the other end of the second branch is connected to the inlet at the other end of the regenerator shell.

[0014] According to the present invention, a room temperature magnetic refrigeration system is provided, wherein the magnet driving component includes: Drive motor; A transmission assembly is provided, which is connected to the drive motor and the magnet. The drive motor is used to drive the magnet to rotate through the transmission assembly.

[0015] According to a room temperature magnetic refrigeration system provided by the present invention, the magnet driving assembly further includes: A torque sensor is connected to both the transmission assembly and the drive motor, and the torque sensor is used to detect the torque output by the drive motor.

[0016] The active magnetic regenerator based on a composite intercalation structure provided by this invention forms a composite intercalation magnetic regenerator plate structure by inserting a low thermal conductivity insulating layer into the magnetic regenerator plate and setting a high thermal conductivity layer at the end of the plate. Without relying on special materials, it achieves the anisotropic heat transfer characteristics of an ideal regenerator, namely "high radial thermal conductivity and low axial thermal conductivity", which significantly reduces the axial heat conduction loss of the regenerator, improves the utilization rate of the magnetic regenerator effect, and enhances the cooling performance of the regenerator. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the active magnetic regenerator based on a composite intercalation structure provided by the present invention.

[0019] Figure 2 This is a schematic diagram showing the positional relationship between the composite intercalated magnetothermal plate and the fluid flow channel provided by the present invention.

[0020] Figure 3 This is a schematic diagram of the composite intercalated magnetothermal plate provided by the present invention.

[0021] Figure 4 This is a schematic diagram of the room temperature magnetic refrigeration system provided by the present invention.

[0022] Figure label: 10. Regenerator shell; 20. Composite intercalated magnetothermal plate; 21. Magnetothermal material layer; 22. Low thermal conductivity insulation layer; 23. High thermal conductivity layer; 24. Fluid flow channel; 100. Active magnetic regenerator; 200. Piston drive assembly; 300. Hydraulic piston; 400. High-temperature end heat exchanger; 500. Low-temperature end heat exchanger; 600. Magnet; 700. Magnet drive assembly; 710. Drive motor; 720. Transmission assembly; 730. Torque sensor; 810. First main pipeline; 811. First check valve; 820. Second main pipeline; 821. Second check valve; 830. First branch; 831. Third check valve; 840. Second branch. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0024] In the description of the embodiments of the present invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present invention 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. Therefore, they should not be construed as limitations on the embodiments of the present invention. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0025] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention based on the specific circumstances.

[0026] In embodiments of the present invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0027] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0028] like Figures 1 to 3As shown, the active magnetic regenerator 100 based on a composite intercalation structure includes a regenerator shell 10 and a magnetic thermal unit. The regenerator shell 10 is made of 3D printed resin or nylon material, and has a square cavity inside to accommodate the magnetic thermal unit. Both ends of the regenerator shell 10 have inlets and outlets, both with threaded structures and sealed with O-rings. The magnetic thermal unit is located inside the regenerator shell 10 and includes multiple composite intercalated magnetic thermal plates 20. These plates are spaced apart, and a fluid channel 24 is formed between adjacent plates. The fluid channel 24 contains a heat exchange fluid, specifically deionized water. The composite intercalated magnetocaloric plate 20 includes multiple magnetocaloric material layers 21, multiple low thermal conductivity insulating layers 22, and at least one high thermal conductivity layer 23. The multiple magnetocaloric material layers 21 are arranged at intervals along the length direction of the composite intercalated magnetocaloric plate 20. The multiple low thermal conductivity insulating layers 22 are correspondingly disposed between two adjacent magnetocaloric material layers 21. The high thermal conductivity layer 23 is disposed on one side of the magnetocaloric material layer 21 near the end of the composite intercalated magnetocaloric plate 20, that is, the high thermal conductivity layer 23 is disposed on the side of the magnetocaloric material layer 21 near the end of the composite intercalated magnetocaloric plate 20 away from the low thermal conductivity insulating layer 22.

[0029] The active magnetic regenerator 100 based on a composite intercalation structure provided by this invention achieves an anisotropic heat transfer characteristic of "high radial thermal conductivity and low axial thermal conductivity" without relying on special materials. This significantly reduces axial heat conduction loss, improves the utilization rate of the magnetic thermal effect, and enhances the cooling performance of the regenerator. It inserts a low thermal conductivity insulating layer 22 into the magnetic thermal plate and a high thermal conductivity layer at the plate end, thus forming a composite intercalation magnetic thermal plate structure.

[0030] In one embodiment of the present invention, the magnetocaloric material layer 21 and the low thermal conductivity insulating layer 22 are bonded by diffusion welding or thermocompression bonding. This fixed connection method helps to ensure the structural stability and integrity of the composite intercalated magnetocaloric plate 20. At the same time, the high thermal conductivity layer 23 and the magnetocaloric material layer 21 are also bonded by diffusion welding or thermocompression bonding, so that heat can be conducted more smoothly between the magnetocaloric material layer 21 and the high thermal conductivity layer 23, which helps the heat to diffuse rapidly in the radial (thickness direction), thereby improving the heat transfer performance between the end of the composite intercalated magnetocaloric plate 20 and the fluid.

[0031] In one embodiment of the present invention, such as Figure 1As shown, the support frame is positioned between two adjacent composite intercalated magnetothermal plates 20 to position and support the multiple composite intercalated magnetothermal plates 20, fixing the spacing between adjacent composite intercalated magnetothermal plates 20 and thus forming a fluid flow channel 24 of uniform thickness, providing a stable flow space for the fluid. Furthermore, the support frame is made of a non-magnetic material, which reduces the interference of the support frame itself on the magnetic field distribution and reduces the magnetic force experienced by the active magnetic regenerator 100 when moving in the magnetic field, contributing to the stable operation of the entire device.

[0032] In one embodiment of the present invention, the length of the magnetocaloric material layer 21 is 100.00-150.00 mm, the thickness of the magnetocaloric material layer 21 is 0.25-0.75 mm, and the magnetocaloric material layer 21 is a gadolinium plate with a Curie temperature near room temperature, suitable for room temperature magnetic refrigeration systems. Of course, the material of the magnetocaloric material layer is not limited to this; it can also be La(Fe,Si). 13 Room temperature magnetocaloric materials such as MnFePAs system and MnFePAs system.

[0033] In one embodiment of the present invention, the length of the low thermal conductivity insulating layer 22 is 0.10-1.00 mm, and the thickness of the low thermal conductivity insulating layer 22 is 0.25-0.75 mm. The low thermal conductivity insulating layer 22 is made of PET film or highly anisotropic graphite sheet, which has low thermal conductivity in the thickness direction. When placed between adjacent magnetocaloric material layers 21, it can form a thermal resistance in the axial (length direction) direction of the composite intercalated magnetocaloric plate 20. This structure helps to suppress the direct conduction of heat from the high temperature end to the low temperature end of the regenerator, thereby achieving the purpose of suppressing axial heat conduction loss. Of course, the material of the low thermal conductivity insulating layer 22 is not limited to this; the low thermal conductivity insulating layer 22 can also be a polyimide film, PTFE, ceramic coating, or aerogel layer.

[0034] In one embodiment of the present invention, the high thermal conductivity layer 23 has a length of 1.00-25.00 mm and a thickness of 0.25-0.75 mm. The high thermal conductivity layer 23 is a non-magnetic oxygen-free copper sheet. Using a non-magnetic material helps reduce the magnetic force experienced by the high thermal conductivity layer 23 when moving in a magnetic field, thereby reducing the load on the drive system and minimizing unnecessary vibrations. Simultaneously, the oxygen-free copper material itself has a high thermal conductivity, which allows heat to diffuse rapidly in the radial direction (i.e., the thickness direction) of the composite intercalated magnetothermal plate 20, contributing to temperature uniformity across the plate's cross-section. Positioning the high thermal conductivity layer 23 at the end of the composite intercalated magnetothermal plate 20 promotes heat exchange between the magnetothermal material and the fluid when fluid flows through it, enhancing heat transfer. Furthermore, due to its specific heat capacity and mass, the oxygen-free copper sheet also possesses a certain heat capacity, enabling it to absorb or release heat at appropriate stages of the operating cycle, thus storing cold or hot energy and helping to smooth temperature fluctuations in the system. Of course, the material of the high thermal conductivity layer 23 is not limited to this. The material of the high thermal conductivity layer 23 can also be aluminum, silver, pyrolytic graphite or metal-based composite materials.

[0035] In one embodiment of the present invention, the thickness of the fluid channel 24 is 0.15-0.50 mm. This thickness range is chosen based on a comprehensive consideration of heat transfer performance and flow resistance. If the channel thickness is too small, it may cause an increase in fluid pressure drop, thereby increasing the pump power required to drive fluid circulation; if the channel thickness is too large, it may weaken the heat transfer effect between the fluid in the fluid core region and the surface of the composite intercalated magnetothermal plate 20. Therefore, setting the thickness of the fluid channel 24 within this specific range aims to coordinate heat transfer efficiency and flow resistance, helping to control pump power consumption while enabling more sufficient heat exchange between the fluid and the composite intercalated magnetothermal plate 20.

[0036] The preparation process of the composite intercalated magnetocaloric plate 20 includes the following steps: (1) The gadolinium ingot is processed into a magnetothermal plate of uniform size by wire cutting or precision milling, and its surface is polished and ultrasonically cleaned.

[0037] (2) After cold rolling, shearing and surface pickling, oxygen-free copper sheet is laid on the surface of gadolinium plate and then firmly bonded by vacuum hot-press diffusion welding or thermally conductive epoxy resin adhesive.

[0038] (3) Insert a layer of PET film or graphite sheet every 5-20 mm along the axial direction in the middle of the composite intercalated magnetothermal plate 20, and fix it locally with low temperature resistant adhesive to form a periodic thermal barrier structure. (3) The composite intercalated magnetothermal plate 20 is finely ground to ensure that its parallelism and thickness deviation meet the assembly requirements.

[0039] like Figure 4 As shown, the present invention also provides a room temperature magnetic refrigeration system, which includes a piston drive assembly 200, a hydraulic piston 300, a high-temperature end heat exchanger 400, a low-temperature end heat exchanger 500, connecting pipes, a magnet 600, a magnet 600 drive assembly, and an active magnetic regenerator 100 as described in any of the above embodiments. The piston drive assembly 200 is connected to the hydraulic piston 300, specifically, as shown in... Figure 4 As shown, the hydraulic piston 300 has two compression cylinders, with their telescopic rods coaxially arranged and connected. The piston drive assembly 200 is a linear motor, with its telescopic rod coaxially arranged with the compression cylinder's telescopic rod. The linear motor's telescopic rod passes through the cylinder body of one compression cylinder and connects to its piston. When the linear motor's telescopic rod drives the pistons of both compression cylinders to move to the right, the heat exchange fluid in the right compression cylinder is pressurized and flows into the regenerator housing 10 through the second branch 840. When the linear motor's telescopic rod drives the pistons of both compression cylinders to move to the left, the heat exchange fluid in the left compression cylinder is pressurized and flows into the regenerator housing 10 through the first branch 830. Of course, the piston drive assembly 200 is not limited to this; it can also be a hydraulic rod or a cylinder, or other linear drive assembly. The active magnetic regenerator 100 is located inside the magnet 600, and the magnet 600 drive assembly is connected to the magnet 600.

[0040] The connecting pipeline includes a first main pipeline 810, a second main pipeline 820, a first branch pipeline 830, and a second branch pipeline 840. One end of the first main pipeline 810 is connected to a cylinder of the hydraulic piston 300 (i.e., Figure 4 The first main pipeline 810 is connected to the left cylinder of the regenerator housing 10. The other end of the first main pipeline 810 is connected to the outlet of one end of the regenerator housing 10. The high-temperature heat exchanger 400 is connected in series with the first main pipeline 810. A first one-way valve 811 is provided at the other end of the first main pipeline 810. The outlet of the first one-way valve 811 is connected to the high-temperature heat exchanger 400, and the inlet of the first one-way valve 811 is connected to the outlet of one end of the regenerator housing 10. The first one-way valve 811 allows fluid to flow from the outlet of one end of the regenerator housing 10, through the high-temperature heat exchanger 400, and then to the hydraulic piston 300. Simultaneously, it prevents fluid from flowing back from the hydraulic piston 300 to the outlet of the active magnetic regenerator 100, thus ensuring the correct flow direction of the fluid in the refrigeration cycle.

[0041] One end of the first branch 830 is connected to one end of the first main branch 810, and the other end of the first branch 830 is connected to the inlet at one end of the regenerator housing 10. A second check valve 821 is provided at one end of the first branch 830, wherein the inlet of the second check valve 821 is connected to one end of the first main branch 810, and the outlet of the second check valve 821 is connected to the inlet at one end of the regenerator housing 10. The second check valve 821 allows the heat exchange fluid in the left cylinder to flow into the regenerator housing 10, while preventing the heat exchange fluid in the regenerator housing 10 from flowing into the left cylinder through the first branch 830.

[0042] One end of the second main pipeline 820 is connected to the other cylinder of the hydraulic piston 300 (i.e. Figure 4 The second main pipeline 820 is connected to the right cylinder of the regenerator housing 10. The other end of the second main pipeline 820 is connected to the outlet of the other end of the regenerator housing 10. The low-temperature heat exchanger 500 is connected in series with the second main pipeline 820. A third check valve 831 is provided at the other end of the second main pipeline 820. The outlet of the third check valve 831 is connected to the low-temperature heat exchanger 500, and the inlet of the third check valve 831 is connected to the outlet of the other end of the regenerator housing 10. The second check valve 821 allows fluid to flow from the outlet of the other end of the regenerator housing 10 into the low-temperature heat exchanger 500 through the second main pipeline 820, and prevents fluid in the low-temperature heat exchanger 500 from flowing into the regenerator housing 10 through the second main pipeline 820. One end of the second branch pipeline 840 is connected to one end of the second main pipeline 820, and the other end of the second branch pipeline 840 is connected to the inlet of the other end of the regenerator housing 10.

[0043] The magnet 600 has a tubular structure and employs a double-layer nested Halbach permanent magnet assembly structure. This structure helps to concentrate the magnetic field in the central hole region inside the magnet 600, while reducing magnetic leakage outside the magnet 600. The magnet 600 assembly consists of 16 differentially magnetized NdFeB permanent magnet sector segments. This segmented combination construction provides a feasible engineering implementation path for achieving the specific magnetization direction arrangement required for the Halbach array. The active magnetic regenerator 100 is installed at the central hole position of the magnet 600 array, placing the entire active magnetic regenerator 100 in the core region of the magnetic field. The inner magnet 600 is connected to the magnet 600 drive assembly. During operation, the inner magnet 600 rotates relative to the fixed active magnetic regenerator 100 and the outer magnet 600 under the drive of the magnet 600 drive assembly. The rotational motion causes the magnetic fields generated by the inner magnet 600 and the outer magnet 600 to periodically superimpose or cancel each other in the central hole region, thereby applying an alternating magnetic field with an intensity varying between 0.04 T and 1.54 T to the stationary active magnetic regenerator 100, providing a driving force for the periodic magnetocaloric effect of the magnetocaloric material.

[0044] The active magnetic regenerator 100 has dual flow paths at both ends, with one-way valves configured in the corresponding connecting pipes. When fluid flows alternately to both ends of the active magnetic regenerator 100 under piston drive, these one-way valves automatically open or close based on the fluid pressure difference, guiding the fluid to flow in from the designated inlet and out from the designated outlet. This passive flow control method responds quickly, enabling rapid switching between the two flow directions and helping to avoid mixing or backflow during the reversal process, thus improving the efficiency of fluid reversal. The high-temperature end heat exchanger 400 is a partition wall heat exchanger.

[0045] In one embodiment of the present invention, such as Figure 4 As shown, the magnet 600 drive assembly includes a drive motor 710 and a transmission assembly 720. The transmission assembly 720 is connected to the drive motor 710 and the magnet 600. The drive motor 710 is used to drive the magnet 600 to rotate through the transmission assembly 720.

[0046] It should be noted that the transmission component 720 can be a gear set, a combination of a belt and pulley, or other transmission methods.

[0047] In one embodiment of the present invention, the magnet 600 driving assembly further includes a torque sensor 730, which is connected to the transmission assembly 720 and the drive motor 710 respectively. The torque sensor 730 is used to detect the torque output by the drive motor 710.

[0048] like Figure 4 As shown, the working process of the room temperature magnetic refrigeration system includes four stages: First, in the excitation stage, the permanent magnet 600 rotates to a high magnetic field position, and the magnetothermal material layer 21 inside the active magnetic regenerator 100 is magnetized and rapidly heated. At this time, the hydraulic piston 300 remains stationary, and the fluid does not flow. Then, in the hot blowing stage, while maintaining a high magnetic field, when the extension rod of the linear motor drives the pistons of the two compression cylinders to move to the right, the hydraulic piston 300 pushes the fluid from the cold end to the hot end (i.e., the extension rod of the linear motor drives the pistons of the two compression cylinders to move to the right), and the fluid interacts with the high-temperature magnetothermal material. After the material layer 21 and the copper layer have fully exchanged heat, they enter the high-temperature heat exchanger 400 to release heat to the outside. Then, in the demagnetization stage, the hydraulic piston 300 stops moving, the permanent magnet 600 rotates to the low magnetic field position, the magnetothermal material is demagnetized and rapidly cooled, and at the same time, the active magnetic regenerator 100 maintains a predetermined axial temperature gradient. Finally, in the cold blowing stage, under the low magnetic field state, the hydraulic piston 300 pushes the fluid from the hot end to the cold end (that is, the extension rod of the linear motor drives the pistons of the two compression cylinders to move to the left). After exchanging heat with the low-temperature magnetothermal material, the fluid enters the cold end heat exchanger to produce a cooling effect.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An active magnetic regenerator based on a composite intercalation structure, characterized in that, include: Regenerator casing (10); A magnetocalor unit is disposed inside the outer shell (10) of the regenerator and includes multiple composite intercalated magnetocalor plates (20). The multiple composite intercalated magnetocalor plates (20) are arranged at intervals, and a fluid flow channel (24) is formed between two adjacent composite intercalated magnetocalor plates (20). The composite intercalated magnetocalor plate (20) includes multiple magnetocaloric material layers (21), multiple low thermal conductivity insulation layers (22), and at least one high thermal conductivity layer (23). The multiple magnetocaloric material layers (21) are arranged at intervals along the length direction of the composite intercalated magnetocalor plate (20). The multiple low thermal conductivity insulation layers (22) are disposed one-to-one between two adjacent magnetocaloric material layers (21). The high thermal conductivity layer (23) is disposed on one side of the magnetocaloric material layer (21) near the end of the composite intercalated magnetocalor plate (20).

2. The active magnetic regenerator (100) based on a composite intercalation structure according to claim 1, characterized in that, The magnetocaloric material layer (21) and the low thermal conductivity insulating layer (22) are bonded by diffusion welding or hot pressing, and the high thermal conductivity layer (23) and the magnetocaloric material layer (21) are bonded by diffusion welding or hot pressing.

3. The active magnetic regenerator (100) based on a composite intercalation structure according to claim 1, characterized in that, Also includes: The support frame is made of a non-magnetic material and is disposed between two adjacent composite intercalated magnetothermal plates (20).

4. The active magnetic regenerator (100) based on a composite intercalation structure according to claim 1, characterized in that, The length of the magnetothermal material layer (21) is 100.00-150.00 mm, and the thickness of the magnetothermal material layer (21) is 0.25-0.75 mm.

5. The active magnetic regenerator (100) based on a composite intercalation structure according to any one of claims 1 to 4, characterized in that, The length of the low thermal conductivity insulation layer (22) is 0.10-1.00 mm, and the thickness of the low thermal conductivity insulation layer (22) is 0.25-0.75 mm.

6. The active magnetic regenerator (100) based on a composite intercalation structure according to any one of claims 1 to 4, characterized in that, The length of the high thermal conductivity layer (23) is 1.00-25.00 mm, and the thickness of the high thermal conductivity layer (23) is 0.25-0.75 mm.

7. The active magnetic regenerator (100) based on a composite intercalation structure according to any one of claims 1 to 4, characterized in that, The thickness of the fluid channel (24) is 0.15-0.50 mm.

8. A room temperature magnetic refrigeration system, characterized in that, The system includes a piston drive assembly (200), a hydraulic piston (300), a high-temperature end heat exchanger (400), a low-temperature end heat exchanger (500), connecting pipes, a magnet (600), a magnet drive assembly (700), and an active magnetic regenerator (100) according to any one of claims 1 to 7. The piston drive assembly (200) is connected to the hydraulic piston (300), and the active magnetic regenerator (100) is disposed inside the magnet (600). The component (700) is connected to the magnet (600); the connecting pipeline includes a first main pipeline (810), a second main pipeline (820), a first branch pipeline (830), and a second branch pipeline (840). One end of the first main pipeline (810) is connected to a cylinder of the hydraulic piston (300), and the other end of the first main pipeline (810) is connected to the outlet at one end of the regenerator shell (10). The high-temperature heat exchanger (400) is connected in series with the first main pipeline (810). 10), the other end of the first main pipeline (810) is provided with a first one-way valve (811); one end of the first branch (830) is connected to one end of the first main pipeline (810), one end of the first branch (830) is provided with a second one-way valve (821), the other end of the first branch (830) is connected to the inlet of one end of the regenerator shell (10); one end of the second main pipeline (820) is connected to the other cylinder of the hydraulic piston (300), the other end of the second main pipeline (820) is connected to the outlet of the other end of the regenerator shell (10), the low-temperature heat exchanger (500) is connected in series with the second main pipeline (820), the other end of the second main pipeline (820) is provided with a third one-way valve (831); one end of the second branch (840) is connected to one end of the second main pipeline (820), the other end of the second branch (840) is connected to the inlet of the other end of the regenerator shell (10).

9. The room temperature magnetic refrigeration system according to claim 8, characterized in that, The magnet drive assembly (700) includes: Drive motor (710); A transmission assembly (720) is connected to the drive motor (710) and the magnet (600), and the drive motor (710) is used to drive the magnet (600) to rotate through the transmission assembly (720).

10. The room temperature magnetic refrigeration system according to claim 9, characterized in that, The magnet drive assembly (700) further includes: A torque sensor (730) is connected to the transmission assembly (720) and the drive motor (710) respectively. The torque sensor (730) is used to detect the torque output by the drive motor (710).

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