Magnetic refrigeration device

Abstract

The invention discloses a magnetic refrigeration device which comprises a refrigeration module and a magnetic field generator, the refrigeration module comprises a heat absorption surface, a heat dissipation surface and an annular heat exchange device arranged between the heat absorption surface and the heat dissipation surface, and the heat absorption surface is in contact with a to-be-refrigerated area; the annular heat exchange device comprises a cold storage area, a heat storage area and an annular heat exchange channel penetrating through the cold storage area and the heat storage area, and a cooling medium circularly flows in the annular heat exchange channel; a porous magnetic heat exchange unit is arranged in the cold storage area and comprises a porous magnetic filling layer, and the porous magnetic filling layer is evenly filled with magnetic refrigerating media. A porous micro-channel heat exchange unit is arranged in the heat storage area, and a cooling medium flows in the porous micro-channel heat exchange unit; the cold storage area is in contact with the heat absorption face, and the heat storage area is in contact with the heat dissipation face. The heat exchange efficiency and the refrigeration efficiency of the magnetic refrigeration system are improved, the pressure drop, the heat loss and the manufacturing cost are reduced, the system structure is simplified, and the magnetic refrigeration system can adapt to various application scenes.

Description

Technical Field

[0001] The present invention relates to the technical field of magnetic refrigeration, and in particular to a magnetic refrigeration device. Background Art

[0002] Magnetic refrigeration technology, as an emerging solid-state refrigeration method, is considered to be a refrigeration technology with broad application prospects due to its high efficiency, environmental protection, low noise and low vibration. This technology uses the magnetocaloric effect (MCE) of magnetic materials when the external magnetic field changes, and absorbs and releases heat through the magnetization and demagnetization process to achieve the purpose of refrigeration. Compared with traditional vapor compression refrigeration technology, magnetic refrigeration technology can theoretically be closer to the efficiency limit of the Carnot cycle, and does not require the use of environmentally harmful refrigerants, showing its important role in sustainable development.

[0003] Although magnetic refrigeration technology has significant potential and advantages, it still faces several key technical challenges in many commercial applications. Specifically:

[0004] Existing magnetic refrigeration devices are often bulky and heavy, which limits their application in portable and miniaturized devices. The heat exchangers in magnetic refrigeration systems are mainly of two types: particle filling and plate structure. These two structures usually have large pressure drops and heat losses, resulting in low refrigeration efficiency. Especially in the magnetic refrigeration process, in order to allow the cooling fluid to take away the heat and cold of the cold storage bed in time, relatively complex fluid pipelines and heat exchangers will be set up, making it difficult to control the fluid temperature and refrigeration temperature; at the same time, the magnetic hysteresis phenomenon of magnetic refrigeration materials during the magnetization and demagnetization process will cause additional energy loss, affecting the refrigeration efficiency. Summary of the invention

[0005] Based on the above-mentioned technical problems existing in the magnetic refrigeration system, the present invention provides a new and efficient magnetic refrigeration device, which improves the heat exchange efficiency and refrigeration efficiency of the magnetic refrigeration system, reduces the pressure drop, heat loss and manufacturing cost, simplifies the system structure, and can be adapted to various application scenarios.

[0006] Some implementation plans adopted to solve the above technical problems include:

[0007] A magnetic refrigeration device, comprising a refrigeration module and a magnetic field generator, wherein the two poles of the magnetic field generator are respectively located on both sides of the refrigeration module; the refrigeration module comprises a heat absorbing surface, a heat dissipating surface and an annular heat exchange device arranged between the heat absorbing surface and the heat dissipating surface, wherein the heat absorbing surface contacts the area to be refrigerated; a fin heat dissipation structure is arranged on the side of the heat absorbing surface contacting the area to be refrigerated; the annular heat exchange device comprises a cold storage area, a heat storage area and an annular heat exchange channel running through the cold storage area and the heat storage area, wherein a cooling medium circulates in the annular heat exchange channel; the inside of the cold storage area A porous magnetic heat exchange unit is provided, which includes a porous magnetic filling layer, in which a magnetic refrigeration medium is uniformly filled; a porous microchannel heat exchange unit is provided inside the heat storage area, in which the cooling medium flows; the cold storage area is in contact with the heat absorption surface, and the heat storage area is in contact with the heat dissipation surface; the magnetic refrigeration medium in the cold storage area absorbs the heat at the heat absorption surface in a demagnetized state, and transfers the heat to the cooling medium in the annular heat exchange channel, and the cooling medium flows into the heat storage area and dissipates heat to the outside through the porous microchannel heat exchange unit.

[0008] As one of the preferred solutions of the present invention, the porous magnetic heat exchange unit in the cold storage area adopts a three-dimensional porous spiral Gyroid structure. The porous magnetic heat exchange unit also includes a spiral flow channel that penetrates the porous magnetic filling layer. The cooling medium is in direct contact with the magnetic refrigeration medium in the porous magnetic filling layer for heat exchange in the spiral flow channel.

[0009] As one of the preferred solutions of the present invention, the refrigeration module includes a multi-stage annular heat exchange device, which is composed of multiple annular heat exchange devices, wherein the cold storage area of ​​one annular heat exchange device contacts the heat absorption surface, and the heat storage area of ​​another annular heat exchange device contacts the heat dissipation surface; the heat storage areas and cold storage areas of two adjacent annular heat exchange devices are arranged opposite to each other; the heat at the heat absorption surface of the refrigeration module is absorbed by the multi-stage annular heat exchange device and transferred step by step to the heat dissipation surface of the refrigeration module.

[0010] As one of the preferred solutions of the present invention, in the multi-stage annular heat exchange device, two adjacent stages of the annular heat exchange device are connected in series through a cooling pipe, and the cooling medium flows in the multi-stage annular heat exchange device in sequence and transfers the heat to the heat dissipation surface of the refrigeration module step by step.

[0011] As one of the preferred solutions of the present invention, in the multi-stage annular heat exchange device, thermal conductive silica gel is provided between the heat storage area and the cold storage area of ​​two adjacent annular heat exchange devices, and the two adjacent annular heat exchange devices exchange heat through the thermal conductive silica gel.

[0012] As one of the preferred solutions of the present invention, in the multi-stage annular heat exchange device, the heat storage area and the cold storage area of ​​two adjacent stages of the annular heat exchange device are cross-arranged.

[0013] As one of the preferred solutions of the present invention, the refrigeration module includes at least two groups of multi-stage annular heat exchange devices arranged side by side.

[0014] As one of the preferred solutions of the present invention, the magnetic field generator includes an electromagnet and a PID controller, and the PID controller controls the intensity and change rate of the magnetic field by changing the current so that the magnetic refrigeration medium in the cold storage area is continuously in a heat absorption state.

[0015] As one of the preferred solutions of the present invention, the refrigeration module further includes a micro-driver, which is connected to the annular heat exchange channel and is used to drive the circulation flow of the cooling medium.

[0016] As one of the preferred solutions of the present invention, a temperature sensor is provided at the heat absorbing surface, and a fan is provided on the heat absorbing surface and / or the heat dissipating surface; the PID controller also controls the operation of the micro-driver and the fan according to the temperature parameters monitored by the temperature sensor; the PID controller integrates an intelligent learning module, a remote fault diagnosis module, a multi-user management module and an energy analysis module.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] The magnetic refrigeration device described in the present invention only has a porous magnetic medium heat exchange structure in the cold storage area. The heat storage area adopts a porous microchannel heat exchange structure. The cooling fluid circulates in the annular heat exchange channel to fully exchange heat with the magnetic refrigeration medium in the porous magnetic filling layer, and dissipates heat to the outside in the porous microchannel heat exchange structure. The structure is simple and the heat exchange efficiency and refrigeration efficiency of the magnetic refrigeration system are improved.

[0019] In the magnetic refrigeration device described in the present invention, the porous magnetic heat exchange unit adopts a three-dimensional porous spiral Gyroid structure. The magnetic refrigeration medium is filled in the porous magnetic filling layer. The flow channel presents a porous spiral Gyroid structure with continuous curved surfaces, high symmetry and large specific surface area. It can create the largest specific surface area in a limited space, thereby improving the heat exchange efficiency.

[0020] The magnetic refrigeration device of the present invention adopts a PID controller to dynamically control the start-up and power amplitude of the magnetic field generator and the micro-driver, so that the magnetic refrigeration medium in the cold storage area is continuously in a heat absorption state, and the refrigeration effect will not be affected by the reverse heating phenomenon caused by adding magnetism.

[0021] The magnetic refrigeration device described in the present invention adopts a multi-stage annular heat exchange device to dissipate heat step by step. By relying on the time difference and the heat difference, the magnetic refrigeration medium in the cold storage area in contact with the heat absorption surface at the top layer can be quickly returned from the magnetized heat release state to the heat absorption state, thereby maintaining its continuous heat absorption ability and avoiding unstable effects on the cooling of the refrigeration area.

[0022] The magnetic refrigeration device of the present invention achieves efficient refrigeration while maintaining miniaturization, providing new possibilities for the practical application of magnetic refrigeration technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] For the purpose of explanation, several embodiments of the present invention technology are described in the following drawings. The following drawings are incorporated into this text and constitute a part of the specific embodiment. In some cases, well-known structures and components are shown in block diagram form to avoid obscuring the concept of the present invention subject technology.

[0024] Figure 1 This is an overall schematic diagram of the magnetic refrigeration device according to the first embodiment of the present invention;

[0025] Figure 2 This is a cross-sectional schematic diagram of the magnetic refrigeration device according to the first embodiment of the present invention;

[0026] Figure 3 It is a schematic diagram of the principle of the annular heat exchange device of the present invention.

[0027] Figure 4 It is a schematic diagram of the principle of the porous magnetic filling layer of the present invention.

[0028] Figure 5 This is an overall schematic diagram of the magnetic refrigeration device according to the second embodiment of the present invention;

[0029] Figure 6 This is a cross-sectional schematic diagram of a magnetic refrigeration device according to Embodiment 2 of the present invention;

[0030] Figure 7 This is an overall schematic diagram of the magnetic refrigeration device according to the third embodiment of the present invention;

[0031] Figure 8 This is a cross-sectional schematic diagram of the magnetic refrigeration device according to the third embodiment of the present invention;

[0032] Fig. 9 It is a cross-sectional schematic diagram of the magnetic refrigeration device according to the fourth embodiment of the present invention;

[0033] Fig.10 This is an overall schematic diagram of the magnetic refrigeration device according to the fifth embodiment of the present invention;

[0034] Fig.11 This is a cross-sectional schematic diagram of a magnetic refrigeration device according to a fifth embodiment of the present invention;

[0035] As shown in the figure:

[0036] Refrigeration module 1, magnetic field generator 2; heat absorption surface 10, heat dissipation surface 20, annular heat exchange device 30; cold storage area 31, heat storage area 32, annular heat exchange channel 33, thermal conductive silica gel 34, micro drive pump 35; porous magnetic filling layer 310, spiral flow channel 311, cooling pipe 330; porous microchannel heat exchange unit 321. DETAILED DESCRIPTION

[0037] The specific embodiments shown below are intended to be descriptions of various configurations of the subject technology of the present invention, and are not intended to represent the only configuration that the subject technology of the present invention can be put into practice. The specific embodiments include specific details intended to provide a thorough understanding of the subject technology of the present invention. However, it will be clear and obvious to those skilled in the art that the subject technology of the present invention is not limited to the specific details shown herein, and can be put into practice without these specific details.

[0038] It can be understood that, in this document, relational terms such as “first” and “second” are intended to distinguish one entity or operation from another entity or operation, and are not intended to express or imply any actual relationship or order between these entities or operations.

[0039] The terms "comprises," "comprising," or any other variation thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0040] Embodiment 1

[0041] Reference Figure 1-3 As shown, a magnetic refrigeration device comprises a refrigeration module 1 and a magnetic field generator 2, wherein the two poles of the magnetic field generator 2 are respectively located at two sides of the refrigeration module; the refrigeration module 1 comprises a heat absorbing surface 10, a heat dissipating surface 20 and an annular heat exchange device 30 arranged between the heat absorbing surface and the heat dissipating surface, wherein the heat absorbing surface 10 contacts the area to be refrigerated; a fin heat dissipating structure 11 is arranged on the side of the heat absorbing surface 10 contacting the area to be refrigerated; the annular heat exchange device 30 comprises a cold storage area 31, a heat storage area 32 and an annular heat exchange channel 33 running through the cold storage area and the heat storage area, wherein the cooling medium circulates in the annular heat exchange channel 33;

[0042] A porous magnetic heat exchange unit is provided inside the cold storage area 31, and the porous magnetic heat exchange unit includes a porous magnetic filling layer 310 and a spiral flow channel 311 that runs through the porous magnetic filling layer, and a magnetic refrigeration medium is evenly filled in the porous magnetic filling layer 310; the cooling medium directly contacts and exchanges heat with the magnetic refrigeration medium in the porous magnetic filling layer 310 in the spiral flow channel 311; a porous microchannel heat exchange unit 321 is provided inside the heat storage area 32, and the cooling medium flows in the porous microchannel heat exchange unit 321; the annular heat exchange channel 33 includes a spiral flow channel 311 and a porous microchannel heat exchange unit 321.

[0043] The cold storage area 31 contacts the heat absorption surface 10, and the heat storage area 32 contacts the heat dissipation surface 20; the magnetic refrigeration medium in the cold storage area 31 absorbs the heat at the heat absorption surface 10 in a demagnetized state, and transfers the heat to the cooling medium in the spiral flow channel 311, and the cooling medium flows into the heat storage area 32 and dissipates heat to the outside through the porous microchannel heat exchange unit 321.

[0044] In this embodiment, the magnetic refrigeration device only sets a porous magnetic medium heat exchange structure in the cold storage area, and the heat storage area adopts a porous microchannel heat exchange structure. The cooling fluid circulates in the annular heat exchange channel, which can fully exchange heat with the magnetic refrigeration medium in the porous magnetic filling layer and dissipate the heat to the outside in the porous microchannel heat exchange structure.

[0045] like Figure 4 As shown, the porous magnetic heat exchange unit in this embodiment adopts a three-dimensional porous spiral Gyroid structure, a magnetic refrigeration medium is filled in the porous magnetic filling layer 310, and the flow channel presents a porous spiral Gyroid structure. This triple periodic minimal surface (TPMS) structure has a continuous surface, high symmetry and a large specific surface area, and can create the largest specific surface area in a limited space, thereby improving the heat exchange efficiency. Preferably, the porous magnetic heat exchange unit is made by 3D printing.

[0046] Gyroid is a triply periodic minimal surface (TPMS) structure first proposed from a mathematical perspective by physicist Alan Schoen in the 1970s. This structure minimizes the surface area within a given boundary, thus having unique physical and chemical properties. The basic unit of the Gyroid structure can be translated and replicated on the x, y, and z axes to fill the entire volume, forming a continuous and complex geometric form. With the continuous development of 3D printing technology, the Gyroid structure, as a lightweight and strong structural form, is increasingly used in aerospace, automotive manufacturing and other fields.

[0047] The wall of the porous spiral Gyroid structure flow channel is mesh-like, with hollow gaps between the walls. A filling port is provided at the upper left corner of the device, and the magnetic refrigerant is poured into the gap through the filling port and filled. The mesh size of the wall can be freely adjusted according to the diameter of the magnetic refrigerant particles to ensure that the mesh size is smaller than the refrigerant particles so that the magnetic refrigerant particles will not run into the flow channel. The wall porosity is controlled between 70% and 90% to balance the heat exchange efficiency and pressure drop. The hole wall of the porous heat exchange device is subjected to special surface treatment, such as coating or plasma treatment, to enhance the heat exchange efficiency, reduce dirt adhesion, and extend the maintenance cycle of the equipment.

[0048] In this embodiment, the porous microchannel heat exchange unit 321 adopts a porous wall microchannel structure, and is arranged in the heat storage area through various layout modes such as staggered, grid, dendritic, maze and double helix, thereby enhancing the heat exchange efficiency between the heat storage area and the cooling medium and improving the refrigeration effect of the system.

[0049] In order to improve the heat exchange efficiency, the magnetic refrigeration medium exists in the form of small balls with a size of 0.4mm to 1mm. These small balls are filled into the porous magnetic filling layer of the porous magnetic heat exchange unit and fixed in the cold storage area of ​​the annular heat exchange channel. The principle is a process of using the magnetocaloric effect of magnetic materials to achieve refrigeration. Specifically, magnetic materials release heat when magnetized and absorb heat when demagnetized. Through repeated isothermal magnetization and adiabatic demagnetization, a low-temperature effect can be achieved, thereby realizing refrigeration without the need for a gas medium. It has the advantages of high efficiency and energy saving, green environmental protection, simple structure, etc., and the heat transfer medium can be a harmless fluid such as water.

[0050] The cooling medium described in this embodiment can be selected from ammonia water, etc., because ammonia water has good thermal conductivity and alkaline properties. Its alkaline properties help reduce corrosion to the magnetic refrigerant, thereby extending the service life of the system and improving the stability of the system.

[0051] The refrigeration module 1 further includes a micro driver 35 , which is connected to the annular heat exchange channel 33 and is used to drive the circulation of the cooling medium in the annular heat exchange channel 33 .

[0052] The magnetic field generator 2 includes an electromagnet and a PID controller. The PID controller controls the intensity and change rate of the magnetic field by changing the current so that the magnetic refrigeration medium in the cold storage area is continuously in a heat absorption state.

[0053] Specifically, when the magnetic refrigeration device described in this embodiment is used to cool the area to be refrigerated, the heat absorption surface is brought close to the area to be refrigerated, and the working process is as follows:

[0054] The PID controller controls the magnetic field generator and the micro-actuator to start, and controls the magnetic field strength of the magnetic field generator, so that the magnetic refrigeration medium in the cold storage area is in a demagnetized state, and the magnetic refrigeration medium absorbs the heat at the heat absorption surface 10, and the cooling medium directly contacts with the magnetic refrigeration medium in the porous spiral flow channel 311, and flows into the heat storage area after absorbing the heat of the magnetic refrigeration medium, and indirectly exchanges heat with the air or fluid at the heat dissipation surface in the porous microchannel heat exchange unit 321 in the heat storage area, and dissipates the heat to the heat dissipation surface, completing a refrigeration cycle;

[0055] When the magnetic refrigeration medium needs to be magnetized, the PID controller changes the current to control the intensity and change rate of the magnetic field, so that the magnetic refrigeration medium can complete the magnetization in a short time. Since the magnetic refrigeration medium is in a heat release state during magnetization, in order to control the reverse heating effect of the heat release on the heat absorption surface, the PID controller can further change the power of the micro-drive pump and increase the flow rate of the cooling medium accordingly to speed up the heat release rate of the magnetic refrigeration medium and reduce the temperature impact on the refrigeration area. When the required magnetic flux is reached, the PID controller immediately changes the current of the magnetic field generator to put the magnetic refrigeration medium in a demagnetized state.

[0056] By repeating this cycle, the magnetic refrigeration medium in the cold storage area can be kept in a heat absorption state, and the refrigeration effect will not be affected by reverse heating caused by adding magnetism.

[0057] Preferably, a temperature sensor is provided at the heat absorbing surface 10, and a fan is provided on the heat absorbing surface and / or the heat dissipating surface; the PID controller also controls the operation of the micro-actuator and the fan according to the temperature parameters monitored by the temperature sensor.

[0058] The PID controller integrates an intelligent learning module, a remote fault diagnosis module, a multi-user management module and an energy analysis module.

[0059] The intelligent learning module can automatically adjust the temperature setting according to the user's habits to achieve a more energy-saving and comfortable cooling effect. Set different modes, such as energy-saving mode, fast cooling mode, custom mode, etc. to meet the needs of different scenarios.

[0060] The remote fault detection module can remotely diagnose and notify users of potential faults or maintenance needs, such as filter cleaning, abnormal system pressure, etc. It provides fault code explanations and FAQs to help users solve simple problems by themselves.

[0061] The multi-user management module allows multiple users to access and control the magnetic cooling system, which is suitable for multi-user environments such as offices, shared spaces, etc. Different users can have different permissions, such as administrators can make system settings, while ordinary users can only view the status. It can also be integrated with other smart devices, such as smart thermostats, smart sockets, etc., to achieve a wider range of smart home control. Control the magnetic cooling system through voice assistants (such as Siri, Google Assistant, etc.) to improve convenience.

[0062] The energy efficiency analysis module can help users understand the energy consumption of the magnetic refrigeration system and provide energy-saving suggestions. It can set energy consumption targets and reminders to encourage users to take energy-saving measures.

[0063] An encryption module and an upgrade feedback module can also be added. The encryption module ensures that all data transmission is encrypted to protect user privacy and system security. Provide local storage options for user data to reduce dependence on cloud services. The upgrade feedback module allows users to provide feedback and regularly updates the applet based on user feedback to add new features or improve existing features. Provide system firmware remote upgrade capabilities to continuously improve the performance of the magnetic refrigeration system.

[0064] Specifically, the control process of the PID controller includes data acquisition, PID control algorithm and magnetic field control. The signals of the Hall element and the temperature sensor are collected through the ADC, and the control signal is calculated according to the real-time data and target value of the magnetic field using the PID control algorithm. According to the output of the PID controller, the current of the electromagnet is adjusted through the PWM signal to achieve precise adjustment of the magnetic field strength.

[0065] In terms of hardware configuration, the present invention configures a microcontroller such as STM32 to implement the PID control algorithm and process sensor data. At the same time, the ADC channel is configured to collect signals from the Hall element and the temperature sensor, and the PWM channel is configured to control the current of the electromagnet. A program is written to implement the PID control algorithm, and the ADC and PWM interfaces interact with the hardware to implement the cycle of data acquisition, PID calculation and PWM output to achieve dynamic control of the magnetic field.

[0066] According to the system response and stability, adjust the PID parameters (P value, I value, D value) to optimize the control effect. The adjustment of PID parameters is an iterative process, and multiple adjustments are made according to the actual system response to achieve the best control effect.

[0067] Embodiment 2

[0068] The magnetic refrigeration device described in this embodiment is different from that in Embodiment 1 in that: the refrigeration module 1 includes a multi-stage annular heat exchange device, which is composed of a plurality of annular heat exchange devices 30, wherein the cold storage area of ​​one annular heat exchange device contacts the heat absorption surface, and the heat storage area of ​​another annular heat exchange device contacts the heat dissipation surface; the heat storage areas and cold storage areas of two adjacent annular heat exchange devices are arranged opposite to each other; the heat at the heat absorption surface of the refrigeration module is absorbed by the multi-stage annular heat exchange device and transferred step by step to the heat dissipation surface of the refrigeration module.

[0069] like Figure 5-6 As shown, this embodiment includes two annular heat exchange devices arranged up and down, and the two annular heat exchange devices are connected in series through a cooling pipe 330. The cooling medium flows in the multi-stage annular heat exchange device in sequence and transfers the heat to the heat dissipation surface of the refrigeration module step by step. This flow process can make the time for the cooling medium to reach each annular heat exchange device different. Relying on the time difference of the cooling medium flow and the heat difference caused by the step-by-step heat dissipation, the influence of magnetic reverse heating on the refrigeration effect is reduced.

[0070] Specifically, when the magnetic refrigeration medium needs to be magnetized after absorbing heat for a period of time, assuming that the magnetization starts at the t second, the magnetic refrigeration media in the two annular heat exchange devices are magnetized, that is, each cold storage area is magnetized from the t second, and the magnetic refrigeration medium releases heat during magnetization; since the fluid flows in a stepped manner, when it flows from the top layer to the bottom, it is already t+N seconds, and the cold storage areas below may have completed magnetization and returned to the heat absorption state; absorbing the heat dissipated by the previous level, the cold storage areas of the previous level also quickly return to the heat absorption state.

[0071] After multiple stages are connected in series, relying on the time difference and heat difference, the magnetic refrigeration medium in the cold storage area in contact with the heat absorption surface can quickly return from the magnetic heat release state to the heat absorption state, maintaining its continuous heat absorption ability and avoiding unstable effects on the cooling of the refrigeration area.

[0072] Embodiment 3

[0073] The magnetic refrigeration device described in this embodiment is different from that in Embodiment 1 in that: the refrigeration module 1 includes a multi-stage annular heat exchange device, which is composed of a plurality of annular heat exchange devices 30, wherein the cold storage area of ​​one annular heat exchange device contacts the heat absorption surface, and the heat storage area of ​​another annular heat exchange device contacts the heat dissipation surface; the heat storage areas and cold storage areas of two adjacent annular heat exchange devices are arranged opposite to each other; the heat at the heat absorption surface of the refrigeration module is absorbed by the multi-stage annular heat exchange device and transferred step by step to the heat dissipation surface of the refrigeration module.

[0074] like Figure 7-8As shown, this embodiment includes two annular heat exchange devices arranged up and down, and a heat-conducting silica gel 34 is provided between the heat storage area and the hot and cold areas of the two annular heat exchange devices. The cold storage area of ​​the upper annular heat exchange device absorbs heat and transfers it to the heat storage area. The cold storage area of ​​the lower annular heat exchange device absorbs heat from the upper heat storage area and transfers it to the heat storage area of ​​the lower annular heat exchange device, and then transfers it to the heat dissipation surface through the heat storage area of ​​the lower layer.

[0075] Compared with the third embodiment, this multi-stage heat exchange method has a simpler structure. Although there is no time difference caused by the series connection of the cooling fluid, there is still a heat difference caused by the step-by-step heat dissipation. The thermal conductive silicone has a better thermal conductivity, which can accelerate the step-by-step transfer of heat to reduce the impact of magnetic reverse heating on the cooling effect.

[0076] Embodiment 4

[0077] The magnetic refrigeration device described in this embodiment is different from that in Embodiment 1 in that: the refrigeration module 1 includes a multi-stage annular heat exchange device, which is composed of a plurality of annular heat exchange devices 30, wherein the cold storage area of ​​one annular heat exchange device contacts the heat absorption surface, and the heat storage area of ​​another annular heat exchange device contacts the heat dissipation surface; the heat storage areas and cold storage areas of two adjacent annular heat exchange devices are arranged opposite to each other; the heat at the heat absorption surface of the refrigeration module is absorbed by the multi-stage annular heat exchange device and transferred step by step to the heat dissipation surface of the refrigeration module.

[0078] like Fig. 9 As shown, this embodiment includes two annular heat exchange devices arranged up and down, and the heat storage areas and hot and cold areas of the two annular heat exchange devices are cross-arranged. The heat storage area of ​​the annular heat exchange device A passes through the cold storage area of ​​the annular heat exchange device B in a cross shape. The contact area is bonded by thermal conductive silicone, which can greatly increase the contact area and improve the heat exchange efficiency between the two stages.

[0079] After absorbing heat, it is transferred to the heat storage area. The cold storage area of ​​the lower annular heat exchanger absorbs the heat of the upper heat storage area and transfers it to the heat storage area of ​​the lower annular heat exchanger, and then transfers it to the heat dissipation surface through the lower heat storage area.

[0080] Embodiment 5

[0081] like Figure 10-11 As shown, the magnetic refrigeration device described in this embodiment is different from that in Embodiment 1 in that: the refrigeration module 1 includes at least 2 groups of multi-stage annular heat exchange devices arranged side by side, and the multi-stage annular heat exchange device is composed of a plurality of annular heat exchange devices 30, wherein the cold storage area of ​​one annular heat exchange device contacts the heat absorption surface, and the heat storage area of ​​another annular heat exchange device contacts the heat dissipation surface; the heat storage areas and cold storage areas of two adjacent annular heat exchange devices are arranged opposite to each other; the heat at the heat absorption surface of the refrigeration module is absorbed by the multi-stage annular heat exchange device and transferred step by step to the heat dissipation surface of the refrigeration module.

[0082] The magnetic refrigeration device described in this embodiment can freely set the size of the refrigeration module and the number of internal annular heat exchange devices according to the area size of the area to be refrigerated. It has a high degree of design freedom and can meet the needs of many occasions.

[0083] As another preferred embodiment of the present invention, in the magnetic refrigeration device, a vacuum insulation panel is provided between the refrigeration module and the magnetic field generator to block heat transfer between the magnetic field generator and the refrigeration module.

[0084] As another preferred embodiment of the present invention, the periphery of the magnetic refrigeration device is provided with a multi-layer magnetic shielding plate, which is made of silicon steel and the inner layer is made of Permalloy, which effectively improves the shielding effectiveness and blocks magnetic field leakage, while simplifying the installation process and ensuring that the surrounding environment and equipment are not affected by the magnetic field.

[0085] The above describes the subject technical solution and corresponding details of the present invention. It can be understood that the above description is only some implementation plans of the subject technical solution of the present invention, and some details may be omitted during the specific implementation.

[0086] In addition, in some embodiments of the above invention, multiple embodiments may be implemented in combination, and various combinations are not listed one by one due to space limitations. Those skilled in the art can freely combine and implement the above embodiments as needed in specific implementation to obtain a better application experience.

[0087] When implementing the subject technical solution of the present invention, those skilled in the art can obtain other detailed configurations or drawings based on the subject technical solution of the present invention and the drawings. Obviously, these details still fall within the scope covered by the subject technical solution of the present invention without departing from the subject technical solution of the present invention.

Claims

1. A magnetic refrigeration device, characterized in that: It includes a refrigeration module and a magnetic field generator, wherein two poles of the magnetic field generator are respectively located on two sides of the refrigeration module; The refrigeration module comprises a heat absorbing surface, a heat dissipating surface and an annular heat exchange device arranged between the heat absorbing surface and the heat dissipating surface, wherein the heat absorbing surface contacts the area to be refrigerated; a fin heat dissipating structure is arranged on the side of the heat absorbing surface contacting the area to be refrigerated; The annular heat exchange device comprises a cold storage area, a heat storage area and an annular heat exchange channel running through the cold storage area and the heat storage area, and the cooling medium circulates in the annular heat exchange channel; A porous magnetic heat exchange unit is provided inside the cold storage area, and the porous magnetic heat exchange unit includes a porous magnetic filling layer, and a magnetic refrigeration medium is evenly filled in the porous magnetic filling layer; a porous microchannel heat exchange unit is provided inside the heat storage area, and the cooling medium flows in the porous microchannel heat exchange unit; The cold storage area is in contact with the heat absorption surface, and the heat storage area is in contact with the heat dissipation surface; the magnetic refrigeration medium in the cold storage area absorbs the heat at the heat absorption surface in a demagnetized state, and transfers the heat to the cooling medium in the annular heat exchange channel, and the cooling medium flows into the heat storage area and dissipates heat to the outside through the porous microchannel heat exchange unit.

2. The magnetic refrigeration device according to claim 1, characterized in that: The porous magnetic heat exchange unit in the cold storage area adopts a three-dimensional porous spiral Gyroid structure. The porous magnetic heat exchange unit also includes a spiral flow channel that penetrates the porous magnetic filling layer. The cooling medium directly contacts and exchanges heat with the magnetic refrigeration medium in the porous magnetic filling layer in the spiral flow channel.

3. The magnetic refrigeration device according to claim 2, characterized in that: The refrigeration module includes a multi-stage annular heat exchange device, which is composed of multiple annular heat exchange devices, wherein the cold storage area of ​​one annular heat exchange device contacts the heat absorption surface, and the heat storage area of ​​another annular heat exchange device contacts the heat dissipation surface; the heat storage areas and cold storage areas of two adjacent annular heat exchange devices are arranged opposite to each other; the heat at the heat absorption surface of the refrigeration module is absorbed by the multi-stage annular heat exchange device and transferred to the heat dissipation surface of the refrigeration module step by step.

4. The magnetic refrigeration device according to claim 3, characterized in that: In the multi-stage annular heat exchange device, two adjacent stages of the annular heat exchange device are connected in series via a cooling pipe, and the cooling medium flows sequentially in the multi-stage annular heat exchange device and transfers heat step by step to the heat dissipation surface of the refrigeration module.

5. The magnetic refrigeration device according to claim 3, characterized in that: In the multi-stage annular heat exchange device, heat-conducting silica gel is provided between the heat storage area and the cold storage area of ​​two adjacent annular heat exchange devices, and the two adjacent annular heat exchange devices exchange heat through the heat-conducting silica gel.

6. The magnetic refrigeration device according to claim 3, characterized in that: In the multi-stage annular heat exchange device, the heat storage area and the cold storage area of ​​two adjacent stages of the annular heat exchange device are arranged crosswise.

7. The magnetic refrigeration device according to any one of claims 3 to 6, characterized in that: The refrigeration module comprises at least two groups of multi-stage annular heat exchange devices arranged side by side.

8. The magnetic refrigeration device according to claim 1, characterized in that: The magnetic field generator includes an electromagnet and a PID controller. The PID controller controls the intensity and the rate of change of the magnetic field by changing the current so that the magnetic refrigeration medium in the cold storage area is continuously in a heat absorption state.

9. The magnetic refrigeration device according to claim 8, characterized in that: The refrigeration module also includes a micro driver, which is connected to the annular heat exchange channel and is used to drive the circulation flow of the cooling medium.

10. The magnetic refrigeration device according to claim 9, characterized in that: A temperature sensor is provided at the heat absorbing surface, and a fan is provided on the heat absorbing surface and / or the heat dissipating surface; the PID controller also controls the operation of the micro-driver and the fan according to the temperature parameters monitored by the temperature sensor; the PID controller integrates an intelligent learning module, a remote fault diagnosis module, a multi-user management module and an energy analysis module.

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