Magnetic heat pump system

Abstract

The invention relates to the technical field of magnetic refrigeration, in particular to a magnetic heat pump system. The problems that a traditional steam compression type air conditioner is not environmentally friendly, poor in energy efficiency and poor in user experience are solved. In order to achieve the purpose, the magnetic heat pump system comprises a magnetic refrigeration unit, the magnetic refrigeration unit comprises multiple stages of magnetic refrigeration modules which are sequentially arranged, each stage of magnetic refrigeration module comprises a magnetic field assembly, a heat regenerator, a pump body and a connecting pipeline, and the adjacent magnetic refrigeration modules are arranged in an overlapped mode; the low-temperature end heat exchanger is communicated with the first-stage magnetic refrigeration module in the multi-stage magnetic refrigeration module; and the high-temperature end heat exchanger communicates with the last stage of magnetic refrigeration module in the multiple stages of magnetic refrigeration modules. By arranging the magnetic refrigeration unit, refrigeration or heating can be achieved through the magnetocaloric effect, and the advantages of being environmentally friendly, high in energy efficiency and good in user experience are achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of magnetic refrigeration, and particularly relates to a magnetic heat pump system. BACKGROUND

[0002] As a common household appliance, the operation energy efficiency and user experience of an air conditioner are paid more and more attention by users. At present, the steam compression refrigeration used by the traditional air conditioner is mature in technology, but this technology also has obvious defects.

[0003] Firstly, the refrigerant used by the traditional air conditioner has a destructive effect on the ozone layer and has a high global warming potential (GWP), which will exacerbate the global warming problem. Secondly, the coefficient of performance (COP) of the traditional compression refrigeration air conditioner is relatively low, and the energy efficiency further decreases under partial load and extreme temperature conditions, and in recent years, the energy efficiency improvement of the traditional air conditioner has reached a bottleneck, and it is difficult to have a big breakthrough. In addition, the compressor in the traditional air conditioner produces noise and vibration during operation, which brings bad user experience.

[0004] Therefore, there is a need in the art for a new technical solution to solve the above problems. SUMMARY

[0005] In order to solve at least one of the above problems in the prior art, that is, to solve the problems of environmental unfriendliness, poor energy efficiency and poor user experience of the traditional steam compression air conditioner, the present application provides a magnetic heat pump system, which comprises:

[0006] A magnetic refrigeration unit, the magnetic refrigeration unit comprises multiple-stage magnetic refrigeration modules arranged in sequence, each stage of the magnetic refrigeration module comprises a magnetic field assembly, a regenerator, a pump body and a connecting pipeline, wherein adjacent magnetic refrigeration modules are arranged in a mutual superposition manner;

[0007] A low-temperature end heat exchanger, the low-temperature end heat exchanger is in communication with a first-stage magnetic refrigeration module in the multiple-stage magnetic refrigeration modules;

[0008] A high-temperature end heat exchanger, the high-temperature end heat exchanger is in communication with a last-stage magnetic refrigeration module in the multiple-stage magnetic refrigeration modules.

[0009] The magnetic heat pump system of the present application can realize refrigeration or heating by using magnetic heat effect through the setting of the magnetic refrigeration unit, without the need of traditional chemical refrigerants, thereby avoiding the damage to the ozone layer and the emission of greenhouse gases. Moreover, the magnetic refrigeration technology has a potential higher energy efficiency ratio, and the theoretical efficiency is 5-6 times that of traditional air conditioners, thereby being capable of more efficiently transferring heat and reducing energy consumption. In addition, the magnetic refrigeration technology does not need a compressor, and the technology can operate at normal pressure, thereby significantly reducing noise and vibration and providing a quieter operating environment. Furthermore, the setting of multiple magnetic refrigeration modules in the magnetic refrigeration unit can realize large temperature span regulation for adapting to a larger range of environmental temperatures, thereby being capable of meeting the refrigeration and heating requirements in different environments. Still further, the mutual cascade arrangement of adjacent magnetic refrigeration modules can ensure the flow rate of the heat conducting medium between the regenerators, thereby realizing sufficient heat exchange between the heat conducting mediums of different levels of magnetic refrigeration modules and reducing the selection difficulty of the pump body.

[0010] In the preferred technical solution of the above magnetic heat pump system, the magnetic refrigeration unit further comprises a heat accumulator, and adjacent magnetic refrigeration modules are arranged in cascade through the heat accumulator.

[0011] The setting of the heat accumulator can enable the heat conducting medium to be fully heat exchanged in the heat accumulator, thereby improving the system energy efficiency.

[0012] In the preferred technical solution of the above magnetic heat pump system, the regenerator has a first port and a second port, the heat accumulator has a first interface and a second interface, and in adjacent magnetic refrigeration modules, the second port of the regenerator at the upper level is in communication with the first interface of the heat accumulator, and the first port of the regenerator at the lower level is in communication with the second interface of the heat accumulator.

[0013] In the preferred technical solution of the above magnetic heat pump system, the regenerator further has a third port and a fourth port, and the heat accumulator further has a third interface and a fourth interface, and in adjacent magnetic refrigeration modules, the third port of the regenerator at the upper level is in communication with the third interface of the heat accumulator, and the fourth port of the regenerator at the lower level is in communication with the fourth interface of the heat accumulator.

[0014] The setting of four ports on the regenerator and four interfaces on the heat accumulator can form two mutually independent medium flow paths, which is conducive to realizing the independent unidirectional flow of the heat conducting medium in the excitation heat extraction and demagnetization cooling processes of each level of magnetic refrigeration module, so that the heat conducting medium presents a pulse flow in the pipe, thereby reducing the flow dead zone. Moreover, the above setting mode of the present application is also conducive to avoiding the energy loss caused by the mutual offset of heat when the heat conducting medium reciprocally flows in the same flow path in the excitation heat extraction and demagnetization cooling processes, thereby further improving the overall system energy efficiency.

[0015] In the preferred technical scheme of the above magnetic heat pump system, the heat accumulator is a heat storage water tank, and the heat storage water tank is formed with a liquid mixing cavity.

[0016] The heat accumulator is a plate heat exchanger, a double-pipe heat exchanger or a regenerative heat exchanger.

[0017] In the preferred technical scheme of the above magnetic heat pump system, the pump body comprises a first circulating pump and a second circulating pump, the magnetic refrigeration unit further comprises a first liquid storage member and a second liquid storage member, the liquid outlet of the first circulating pump is communicated with the first port of the regenerative heat exchanger, the liquid inlet of the first circulating pump is communicated with the second interface of the heat accumulator except for the first-stage magnetic refrigeration module, the liquid outlet of the second circulating pump is communicated with the third port of the regenerative heat exchanger, the liquid inlet of the second circulating pump is communicated with the third interface of the heat accumulator except for the last-stage magnetic refrigeration module, the first liquid storage member is arranged between the fourth port of the regenerative heat exchanger and the liquid inlet of the first circulating pump in the first-stage magnetic refrigeration module, and the second liquid storage member is arranged between the second port of the regenerative heat exchanger and the liquid inlet of the second circulating pump in the last-stage magnetic refrigeration module.

[0018] In the preferred technical scheme of the above magnetic heat pump system, the low-temperature end heat exchanger is arranged between the fourth port of the regenerative heat exchanger and the first liquid storage member in the first-stage magnetic refrigeration module, and the high-temperature end heat exchanger is arranged between the second port and the second liquid storage member in the last-stage magnetic refrigeration module.

[0019] In the preferred technical scheme of the above magnetic heat pump system, the pump body is a double-acting piston pump, the double-acting piston pump has two liquid storage cavities which are independent of each other, one of the liquid storage cavities is provided with a first liquid inlet and a first liquid outlet, the other of the liquid storage cavities is provided with a second liquid inlet and a second liquid outlet, the first liquid inlet is communicated with the fourth port of the regenerative heat exchanger, the second liquid inlet is communicated with the second port of the regenerative heat exchanger, the first liquid outlet is communicated with the fourth interface of the heat accumulator except for the first-stage magnetic refrigeration module, the second liquid outlet is communicated with the first interface of the heat accumulator except for the last-stage magnetic refrigeration module, the first liquid outlet of the double-acting piston pump in the first-stage magnetic refrigeration module is communicated with the first port of the regenerative heat exchanger, and the second liquid outlet of the double-acting piston pump in the last-stage magnetic refrigeration module is communicated with the third port of the regenerative heat exchanger.

[0020] The double-acting piston pump is used as the pump body, the internal cavity of the double-acting piston pump is larger, can be used as a storage chamber of the heat exchange medium, and thus the liquid storage device of the heat exchange medium can be saved, and the complexity of the system is reduced.

[0021] In the preferred technical solutions of the above magnetic heat pump system, the low-temperature end heat exchanger is arranged between the first port of the regenerator in the first-stage magnetic refrigeration module and the first liquid outlet of the bidirectional piston pump, and the high-temperature end heat exchanger is arranged between the third port of the regenerator in the last-stage magnetic refrigeration module and the second liquid outlet of the bidirectional piston pump; or

[0022] The low-temperature end heat exchanger is arranged between the fourth port of the regenerator in the first-stage magnetic refrigeration module and the first liquid inlet of the bidirectional piston pump, and the high-temperature end heat exchanger is arranged between the second port of the regenerator in the last-stage magnetic refrigeration module and the second liquid inlet of the bidirectional piston pump.

[0023] In the preferred technical solutions of the above magnetic heat pump system, a one-way valve or an electrically controlled on-off valve is arranged at the first port of the regenerator, wherein the one-way valve is configured to be turned on when the heat exchange medium flows into the regenerator from the first port; and / or

[0024] A one-way valve or an electrically controlled on-off valve is arranged at the second port of the regenerator, wherein the one-way valve is configured to be turned on when the heat exchange medium flows out of the regenerator from the second port; and / or

[0025] A one-way valve or an electrically controlled on-off valve is arranged at the third port of the regenerator, wherein the one-way valve is configured to be turned on when the heat exchange medium flows into the regenerator from the third port; and / or

[0026] A one-way valve or an electrically controlled on-off valve is arranged at the fourth port of the regenerator, wherein the one-way valve is configured to be turned on when the heat exchange medium flows out of the regenerator from the fourth port.

[0027] The arrangement of the one-way valve and the electrically controlled on-off valve can realize the flow direction control of the heat conduction medium and improve the energy efficiency of the system.

[0028] In the preferred technical solutions of the above magnetic heat pump system, the magnetic refrigeration unit comprises three-stage magnetic refrigeration modules arranged in sequence; and / or

[0029] The regenerator is filled with multiple magnetic heat working substances, and the Curie temperatures of the multiple magnetic heat working substances increase or decrease in sequence along the direction from one end of the regenerator to the other end; and / or

[0030] The Curie temperature of a single magnetic heat working substance or the temperature range formed by the Curie temperatures of multiple magnetic heat working substances filled in the regenerator of the multiple-stage magnetic refrigeration module increases or decreases in sequence along the direction from the first-stage magnetic refrigeration module to the last-stage magnetic refrigeration module.

[0031] The above technical solution, by sequentially increasing or decreasing the Curie temperature of various magnetocaloric working fluids within the regenerator, helps to expand the applicable temperature range of the regenerator and improve its heat exchange efficiency. By sequentially increasing or decreasing the temperature range formed by the Curie temperatures of a single or multiple magnetocaloric working fluids within the multi-stage magnetic refrigeration module along the direction from the first stage to the last stage, the large temperature span between the magnetic refrigeration modules can be increased, thereby improving system energy efficiency.

[0032] In the preferred embodiment of the above magnetic heat pump system, the low-temperature heat exchanger, the multi-stage magnetic refrigeration module, and the high-temperature heat exchanger are connected by a loop heat pipe.

[0033] By using a loop heat pipe to connect the low-temperature heat exchanger, the multi-stage magnetic refrigeration module, and the high-temperature heat exchanger, heat exchange efficiency can be significantly improved and energy consumption reduced. Solution 1. A magnetic heat pump system, characterized in that the magnetic heat pump system comprises: A magnetic refrigeration unit, comprising multiple stages of magnetic refrigeration modules arranged sequentially, each stage of the magnetic refrigeration module comprising a magnetic field component, a regenerator, a pump body and connecting pipes, wherein adjacent magnetic refrigeration modules are stacked on top of each other. A low-temperature end heat exchanger, wherein the low-temperature end heat exchanger is connected to the first stage magnetic refrigeration module in the multi-stage magnetic refrigeration module; A high-temperature end heat exchanger, which is connected to the last stage magnetic refrigeration module in the multi-stage magnetic refrigeration module. Option 2. The magnetic heat pump system according to Option 1, characterized in that the magnetic refrigeration unit further includes a heat accumulator, and adjacent magnetic refrigeration modules are stacked together through the heat accumulator. Scheme 3. The magnetic heat pump system according to Scheme 2, characterized in that the regenerator has a first port and a second port, the heat storage device has a first interface and a second interface, and in adjacent magnetic refrigeration modules, the second port of the upper-level regenerator is connected to the first interface of the heat storage device, and the first port of the lower-level regenerator is connected to the second interface of the heat storage device. Option 4. The magnetic heat pump system according to Option 3, characterized in that the regenerator further has a third port and a fourth port, the heat storage device further has a third interface and a fourth interface, and in the adjacent magnetic refrigeration modules, the third port of the upper-level regenerator is connected to the third interface of the heat storage device, and the fourth port of the lower-level regenerator is connected to the fourth interface of the heat storage device. Option 5. The magnetic heat pump system according to any one of Options 2 to 4, characterized in that the heat accumulator is a hot water storage tank, and the hot water storage tank forms a liquid mixing chamber; or The heat accumulator is a plate heat exchanger, a shell-and-tube heat exchanger, or a regenerative heat exchanger. Option 6. The magnetic heat pump system according to Option 4, characterized in that the pump body includes a first circulating pump and a second circulating pump, the magnetic refrigeration unit further includes a first liquid storage device and a second liquid storage device, the discharge port of the first circulating pump is connected to the first port of the regenerator, except for the first-stage magnetic refrigeration module, the inlet of the first circulating pump is connected to the second interface of the heat storage device, the discharge port of the second circulating pump is connected to the third port of the regenerator, except for the last-stage magnetic refrigeration module, the inlet of the second circulating pump is connected to the third interface of the heat storage device, the first liquid storage device is disposed between the fourth port of the regenerator in the first-stage magnetic refrigeration module and the inlet of the first circulating pump, and the second liquid storage device is disposed between the second port of the regenerator in the last-stage magnetic refrigeration module and the inlet of the second circulating pump. Option 7. The magnetic heat pump system according to Option 6, characterized in that the low-temperature heat exchanger is disposed between the fourth port of the regenerator in the first-stage magnetic refrigeration module and the first liquid storage device, and the high-temperature heat exchanger is disposed between the second port in the last-stage magnetic refrigeration module and the second liquid storage device. Option 8. The magnetic heat pump system according to Option 4, characterized in that the pump body is a bidirectional piston pump, the bidirectional piston pump has two independent liquid storage chambers, one of which is provided with a first liquid inlet and a first liquid outlet, and the other liquid storage chamber is provided with a second liquid inlet and a second liquid outlet. The first liquid inlet is connected to the fourth port of the regenerator, and the second liquid inlet is connected to the second port of the regenerator. Except for the first-stage magnetic refrigeration module, the first liquid outlet is connected to the fourth interface of the heat storage device. Except for the last-stage magnetic refrigeration module, the second liquid outlet is connected to the first interface of the heat storage device. The first liquid outlet of the bidirectional piston pump in the first-stage magnetic refrigeration module is connected to the first port of the regenerator, and the second liquid outlet of the bidirectional piston pump in the last-stage magnetic refrigeration module is connected to the third port of the regenerator. Option 9. The magnetic heat pump system according to Option 8, characterized in that the low-temperature heat exchanger is disposed between the first port of the regenerator in the first-stage magnetic refrigeration module and the first liquid outlet of the bidirectional piston pump, and the high-temperature heat exchanger is disposed between the third port of the regenerator in the last-stage magnetic refrigeration module and the second liquid outlet of the bidirectional piston pump; or The low-temperature heat exchanger is located between the fourth port of the regenerator in the first-stage magnetic refrigeration module and the first liquid inlet of the bidirectional piston pump, and the high-temperature heat exchanger is located between the second port of the regenerator in the last-stage magnetic refrigeration module and the second liquid inlet of the bidirectional piston pump. Option 10. The magnetic heat pump system according to Option 4, characterized in that a one-way valve or an electrically controlled on / off valve is provided at the first port of the regenerator, wherein the one-way valve is configured to open when the heat exchange medium flows into the regenerator from the first port; and / or A one-way valve or an electrically controlled on / off valve is provided at the second port of the regenerator, wherein the one-way valve is configured to open when the heat exchange medium flows out of the regenerator from the second port; and / or A one-way valve or an electrically controlled on / off valve is provided at the third port of the regenerator, wherein the one-way valve is configured to open when the heat exchange medium flows into the regenerator from the third port; and / or A one-way valve or an electrically controlled on / off valve is provided at the fourth port of the regenerator, wherein the one-way valve is configured to open when the heat exchange medium flows out of the regenerator from the fourth port. Option 11. The magnetic heat pump system according to Option 1, characterized in that the magnetic refrigeration unit comprises three sequentially arranged magnetic refrigeration modules; and / or The regenerator is filled with a variety of magnetocaloric working fluids, and the Curie temperatures of these fluids increase or decrease sequentially from one end to the other; and / or The temperature range formed by the Curie temperature of a single magnetocalor or multiple magnetocalors filled in the regenerator of the multi-stage magnetic refrigeration module increases or decreases sequentially from the first stage magnetic refrigeration module to the last stage magnetic refrigeration module. Option 12. The magnetic heat pump system according to Option 1, characterized in that the low-temperature end heat exchanger, the multi-stage magnetic refrigeration module and the high-temperature end heat exchanger are connected by a loop heat pipe. Attached Figure Description

[0034] The present application will now be described with reference to the accompanying drawings. In the drawings:

[0035] Figure 1 This is a system diagram of a first embodiment of the magnetic heat pump system of this application;

[0036] Figure 2 This is a system diagram of the magnetic refrigeration unit of the first embodiment of the magnetic heat pump system of this application;

[0037] Figure 3 This is a system diagram of a second embodiment of the magnetic heat pump system of this application;

[0038] Figure 4 This is a system diagram of a third embodiment of the magnetic heat pump system of this application.

[0039] List of reference signs

[0040] 10. Magnetic refrigeration unit; 11a, 11b, 11c. Magnetic refrigeration module; 111. Magnetic field assembly; 112. Regenerator; 1121. First port; 1122. Second port; 1123. Third port; 1124. Fourth port; 1131. First circulation pump; 1132. Second circulation pump; 114. Connecting pipeline; 115. Bidirectional circulation pump; 1151. First liquid inlet; 1152. First liquid outlet; 1153. Second liquid inlet ; 1154, Second liquid outlet; 12, Heat accumulator; 121, First interface; 122, Second interface; 123, Third interface; 124, Fourth interface; 131, First liquid storage unit; 132, Second liquid storage unit; 141, First check valve; 142, Second check valve; 151, First electrically controlled on / off valve; 152, Second electrically controlled on / off valve; 20, Low-temperature end heat exchanger; 30, High-temperature end heat exchanger; 40, Low-temperature end fan; 50, High-temperature end fan. Detailed Implementation

[0041] Preferred embodiments of this application will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of this application and are not intended to limit the scope of protection of this application.

[0042] It should be noted that in the description of this application, terms such as "upper," "lower," "left," and "right," indicating directional or positional relationships, are based on the directional or positional relationships shown in the accompanying drawings. These are used merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Additionally, in the description of this application, "a plurality of" refers to at least two.

[0043] Furthermore, it should be noted that, in the description of this application, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" 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 direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0044] First refer to Figure 1 and Figure 2 This paper provides a brief introduction to the magnetic heat pump system of this application.

[0045] like Figure 1As shown, to address the environmental issues, poor energy efficiency, and unpleasant user experience of traditional vapor compression air conditioners, the magnetic heat pump system of this application includes a magnetic refrigeration unit 10, a low-temperature heat exchanger 20, and a high-temperature heat exchanger 30. The magnetic refrigeration unit 10 includes a multi-stage magnetic refrigeration module arranged sequentially. Figure 1 In sections 11a, 11b, and 11c), each stage of the magnetic refrigeration module includes a magnetic field assembly 111, a regenerator 112, a pump body, and connecting pipes 114. Adjacent magnetic refrigeration modules are stacked on top of each other. The low-temperature heat exchanger 20 is connected to the first stage magnetic refrigeration module in the multi-stage magnetic refrigeration module, and the high-temperature heat exchanger 30 is connected to the last stage magnetic refrigeration module in the multi-stage magnetic refrigeration module.

[0046] It should be explained that, in this application, cascading refers to the overlap and heat exchange of at least part of the flow paths between adjacent magnetic refrigeration modules, as opposed to a continuous flow path from beginning to end. This cascading can be caused by the pipes of adjacent magnetic refrigeration modules nesting together, or by the pipes exchanging heat with each other, or by the refrigerants in the pipes entering the same cavity together for mixing and heat exchange, etc.

[0047] Taking the heating of a magnetic heat pump system as an example, during the operation of the magnetic heat pump system, a changing magnetic field is provided by the magnetic field component 111, and the regenerator 112 is filled with a magnetic thermal working fluid. When a magnetic field is applied to the regenerator 112 in the multi-stage magnetic refrigeration module, the temperature of the magnetic thermal working fluid in the multiple regenerators 112 rises. At this time, the heat transfer medium of each stage of the magnetic refrigeration module is controlled to flow through the regenerator 112 of that stage, so that the heat of the magnetic thermal working fluid in the regenerator 112 can be extracted and transported to the high-temperature end heat exchanger 30. The high-temperature end heat exchanger 30 exchanges heat with the air in the target space to achieve heating of the target space. Then, the magnetic field of the magnetic field component 111 is removed, and the temperature of the magnetothermal working fluid in the regenerator 112 decreases. At this time, the heat transfer medium of each stage of the magnetic refrigeration module is controlled to flow in reverse through the regenerator 112 of that stage. The cold energy in the magnetothermal working fluid in the regenerator 112 can be extracted and transported to the low-temperature end heat exchanger 20. Through heat exchange with the air in the low-temperature end heat exchanger 20, heat is absorbed from the air, thus completing one cycle. The heat transfer medium is not limited in this application and can be water, ethylene glycol, etc. Liquid metal can also be used for high-temperature conditions.

[0048] The magnetic heat pump system of this application, by setting up a magnetic refrigeration unit 10, can achieve cooling or heating using the magnetocaloric effect, eliminating the need for traditional chemical refrigerants and avoiding ozone layer depletion and greenhouse gas emissions. Furthermore, magnetic refrigeration technology has a potentially higher energy efficiency ratio, theoretically 5-6 times that of traditional air conditioning, enabling more efficient heat transfer and reducing energy consumption. In addition, magnetic refrigeration technology does not require a compressor and can operate at atmospheric pressure, significantly reducing noise and vibration and providing a quieter operating environment. Moreover, by setting up multi-stage magnetic refrigeration modules in the magnetic refrigeration unit 10, a wide temperature range regulation can be achieved to adapt to a larger range of ambient temperatures, meeting cooling and heating needs in different environments. Furthermore, the overlapping arrangement of adjacent magnetic refrigeration modules ensures the flow rate of the heat transfer medium between each regenerator 112, achieving sufficient heat exchange between the heat transfer media of different stages of magnetic refrigeration modules and reducing the difficulty of pump selection. The modular structure of this multi-stage magnetic refrigeration module also facilitates disassembly and maintenance.

[0049] The following is further reference Figure 1 and Figure 2 This document provides a detailed description of the first specific embodiment of the magnetic heat pump system of this application. It should be noted beforehand that in the following embodiments, "magnetic refrigeration module" is merely a general term for the module and is not intended to limit its specific operating state. Those skilled in the art will understand that the magnetic refrigeration module simultaneously performs magnetization (heating) and demagnetization (cooling) processes in one cycle. Whether the magnetic refrigeration module specifically functions as a refrigeration or heating module depends entirely on the placement of the low-temperature heat exchanger 20 and the high-temperature heat exchanger 30, and is unrelated to the module's name. Therefore, in some embodiments, when the magnetic refrigeration module is used for heating, it can also be referred to as a magnetic heating module. The magnetic refrigeration unit 10 is similar and will not be described further.

[0050] like Figure 1 and Figure 2 As shown, in the first embodiment, the magnetic heat pump system of this application includes a magnetic refrigeration unit 10, a low-temperature end heat exchanger 20, and a high-temperature end heat exchanger 30.

[0051] The magnetic refrigeration unit 10 includes multiple magnetic refrigeration modules arranged sequentially, as well as a heat accumulator 12, a liquid storage device, and multiple valve bodies. More preferably, in this application, the magnetic refrigeration unit 10 includes three magnetic refrigeration modules 11a, 11b, and 11c arranged sequentially, with adjacent magnetic refrigeration modules stacked together by a heat accumulator 12. In other words, two heat accumulators 12 are arranged between the three magnetic refrigeration modules.

[0052] Each stage of the magnetic refrigeration module includes a magnetic field assembly 111, a regenerator 112, a first circulation pump 1131, a second circulation pump 1132, and connecting pipes 114. The regenerator 112 typically includes a shell and a magnetothermal working fluid disposed within the shell. The magnetothermal working fluid can be arranged in a multi-layer microchannel configuration or a particle-filled configuration. Preferably, the magnetic field assembly 111 includes a drive mechanism, a transmission mechanism, a fixed magnet, and a rotating magnet. Both the fixed and rotating magnets are annular, with the rotating magnet rotatably disposed radially inside the fixed magnet. The drive mechanism can be a motor or a geared motor, and the transmission mechanism can be a transmission belt assembly, a transmission chain assembly, or a gear set, etc. The drive mechanism is connected to the rotating magnet through the transmission mechanism to drive the rotating magnet to rotate. In one possible embodiment, the fixed magnet and the rotating magnet are arranged in a nested Halbach magnet structure. When the drive mechanism drives the rotating magnet to rotate a certain angle, the generated magnetic field can excite the magnetothermal working fluid within the regenerator 112, causing the magnetothermal working fluid temperature to rise. When the drive mechanism drives the rotating magnet to continue rotating at a certain angle, the generated magnetic field can demagnetize the magnetothermal working fluid in the regenerator 112, thereby reducing the temperature of the magnetothermal working fluid.

[0053] The regenerator 112 is filled with various magnetocaloric working fluids, and the Curie temperatures of these fluids increase or decrease sequentially from one end to the other. Taking a magnetic heat pump system used for heating as an example, the Curie temperatures of the magnetocaloric working fluids in the regenerator 112 increase sequentially along the flow direction of the heat transfer medium during excitation. Based on this, each regenerator 112 is filled with magnetocaloric working fluids of different Curie temperatures. These magnetocaloric working fluids can form a temperature range. Again, taking a magnetic heat pump system used for heating as an example, the temperature range corresponding to the regenerator 112 of the multi-stage magnetic refrigeration module increases sequentially from the first-stage magnetic refrigeration module 11a to the last-stage magnetic refrigeration module 11c. In this application, the sequential increase in the temperature range formed by the Curie temperature refers to the sequential increase in the average value of the temperature range formed by the Curie temperature. For example, MnFeP(Si,Ge) alloys, Gd alloys, and GdEr alloys can be used as magnetocaloric working fluids in the temperature range of -35 to 20℃; LaFeSiH alloys can be used in the temperature range of 20 to 60℃; and LaCeFeCoSi alloys can be used in the temperature range above 60℃. Of course, when the magnetic refrigeration system is suitable for refrigeration mode, the Curie temperature of the magnetocaloric working fluid in a single regenerator 112 decreases sequentially along the flow direction of the heat transfer medium during demagnetization. The temperature range corresponding to the regenerator 112 of the multi-stage magnetic refrigeration module decreases sequentially along the direction from the first-stage magnetic refrigeration module 11a to the last-stage magnetic refrigeration module 11c.

[0054] In this application, each regenerator 112 has a first port 1121, a second port 1122, a third port 1123, and a fourth port 1124. The heat storage unit 12 is preferably a hot water storage tank, which forms a liquid mixing chamber. Each heat storage unit 12 has a first interface 121, a second interface 122, a third interface 123, and a fourth interface 124. In adjacent magnetic refrigeration modules, the second port 1122 of the upper-level regenerator 112 is connected to the first interface 121 of the heat storage unit 12, the third port 1123 of the upper-level regenerator 112 is connected to the third interface 123 of the heat storage unit 12, the first port 1121 of the lower-level regenerator 112 is connected to the second interface 122 of the heat storage unit 12, and the fourth port 1124 of the lower-level regenerator 112 is connected to the fourth interface 124 of the heat storage unit 12.

[0055] There are two liquid storage units, namely a first liquid storage unit 131 and a second liquid storage unit 132, which are preferably water tanks. The discharge port of the first circulation pump 1131 is connected to the first port 1121 of the regenerator 112. Except for the first-stage magnetic refrigeration module 11a, the inlet of the first circulation pump 1131 is connected to the second interface 122 of the heat accumulator 12. In the first-stage magnetic refrigeration module 11a, the inlet of the first circulation pump 1131 is connected to the first liquid storage unit 131. The discharge port of the second circulation pump 1132 is connected to the third port 1123 of the regenerator 112. Except for the last-stage magnetic refrigeration module 11c, the inlet of the second circulation pump 1132 is connected to the third interface 123 of the heat accumulator 12. In the last-stage magnetic refrigeration module 11c, the inlet of the second circulation pump 1132 is connected to the second liquid storage unit 132.

[0056] In this embodiment, both the low-temperature heat exchanger 20 and the high-temperature heat exchanger 30 are finned heat exchangers. The low-temperature heat exchanger 20 and the high-temperature heat exchanger 30 are respectively equipped with a low-temperature fan 40 and a high-temperature fan 50 to achieve heat exchange of the heat transfer medium within the low-temperature heat exchanger 20 and the high-temperature heat exchanger 30. The low-temperature heat exchanger 20 is located between the fourth port 1124 of the regenerator 112 in the first-stage magnetic refrigeration module 11a and the first liquid storage unit 131, while the high-temperature heat exchanger 30 is located between the second port 1122 and the second liquid storage unit 132 in the last-stage magnetic refrigeration module 11c. Preferably, in this application, the low-temperature heat exchanger 20, the multi-stage magnetic refrigeration module, and the high-temperature heat exchanger 30 are connected by metal pipes.

[0057] The valve body in this application includes a first one-way valve 141, a second one-way valve 142, a first electrically controlled on / off valve 151, and a second electrically controlled on / off valve 152. Each magnetic refrigeration module includes these four valve bodies. The first one-way valve 141 is located on the connecting pipe 114 at the first port 1121 of the regenerator 112, specifically between the first circulating pump 1131 and the first port 1121 of the regenerator 112. The first one-way valve 141 is configured to open when the heat exchange medium flows from the first circulating pump 1131 to the first port 1121. The second one-way valve 142 is located on the connecting pipe 114 at the third port 1123 of the regenerator 112, specifically between the second circulating pump 1132 and the third port 1123 of the regenerator 112. The second one-way valve 142 is configured to open when the heat exchange medium flows from the second circulating pump 1132 to the third port 1123 of the regenerator 112. Both the first electrically controlled on / off valve 151 and the second electrically controlled on / off valve 152 are solenoid valves. The first electrically controlled on / off valve 151 is installed on the connecting pipe 114 at the second port 1122 of the regenerator 112, specifically between the first interface 121 of the heat storage unit 12 and the second port 1122 of the regenerator 112, or between the high-temperature heat exchanger 30 and the second port 1122 of the regenerator 112 in the last stage magnetic refrigeration module 11c. The second electrically controlled on / off valve 152 is installed on the connecting pipe 114 at the fourth port 1124 of the regenerator 112, specifically between the fourth interface 124 of the heat storage unit 12 and the fourth port 1124 of the regenerator 112, or between the low-temperature heat exchanger 20 and the fourth port 1124 of the regenerator 112 in the first stage magnetic refrigeration module 11a.

[0058] The working principle of the magnetic heat pump system in the first embodiment of this application will be explained below.

[0059] Taking the heating operation of a magnetic heat pump system as an example, in one possible implementation, the magnetic field components 111 of the first-stage magnetic refrigeration module 11a, the second-stage magnetic refrigeration module 11b, and the third-stage magnetic refrigeration module 11c are first activated, causing all rotating magnets to rotate at a specific angle. At this time, the magnetic field components 111 generate magnetic fields that excite the magnetic thermal working fluid in their respective regenerators 112. Then, the three first circulation pumps 1131 and the three first electrically controlled on / off valves 151 in the three magnetic refrigeration modules are simultaneously opened, while the three second circulation pumps 1132 and the three second electrically controlled on / off valves 152 in the three magnetic refrigeration modules are closed. At this time, the heat transfer medium in the three-stage magnetic refrigeration modules flows synchronously for heat exchange. Specifically, the heat transfer medium in the first liquid storage unit 131 is heated after passing through the regenerator 112 in the first-stage magnetic refrigeration module 11a and flows into the heat accumulator 12 between the first-stage magnetic refrigeration module 11a and the second-stage magnetic refrigeration module 11b to heat the heat transfer medium in the heat accumulator 12. Simultaneously, the heat transfer medium in the heat accumulator 12 between the first-stage magnetic refrigeration module 11a and the second-stage magnetic refrigeration module 11b is pumped to the regenerator 112 in the second-stage magnetic refrigeration module 11b for heating, and then flows into the heat accumulator 12 between the second-stage magnetic refrigeration module 11b and the third-stage magnetic refrigeration module 11c to heat the heat transfer medium in the heat accumulator 12. At the same time, the heat transfer medium in the heat accumulator 12 between the second-stage magnetic refrigeration module 11b and the third-stage magnetic refrigeration module 11c is pumped to the regenerator 112 in the third-stage magnetic refrigeration module 11c for heating, enters the high-temperature end heat exchanger 30, and after exchanging heat with the air in the target space under the action of the high-temperature end fan 50, finally flows into the second liquid storage unit 132.

[0060] Next, the magnetic field components 111 controlling the first-stage magnetic refrigeration module 11a, the second-stage magnetic refrigeration module 11b, and the third-stage magnetic refrigeration module 11c continue to operate, causing all rotating magnets to continue rotating at a specific angle. At this time, the magnetic field components 111 generate magnetic fields to demagnetize the magnetothermal working fluid in their respective regenerators 112. Then, the three second circulation pumps 1132 and the three second electrically controlled on / off valves 152 in the three magnetic refrigeration modules are simultaneously opened, while the three first circulation pumps 1131 and the three first electrically controlled on / off valves 151 in the three magnetic refrigeration modules are closed. At this time, the heat transfer medium in the three-stage magnetic refrigeration modules flows synchronously for heat exchange. Specifically, the heat transfer medium in the second liquid storage unit 132 is cooled after passing through the regenerator 112 in the third-stage magnetic refrigeration module 11c and flows into the heat accumulator 12 between the second-stage magnetic refrigeration module 11b and the third-stage magnetic refrigeration module 11c to cool the heat transfer medium in the heat accumulator 12. Meanwhile, the heat transfer medium in the heat accumulator 12 between the second-stage magnetic refrigeration module 11b and the third-stage magnetic refrigeration module 11c is pumped to the regenerator 112 in the second-stage magnetic refrigeration module 11b for cooling, and then flows into the heat accumulator 12 between the first-stage magnetic refrigeration module 11a and the second-stage magnetic refrigeration module 11b to cool the heat transfer medium in the heat accumulator 12. Simultaneously, the heat transfer medium in the heat accumulator 12 between the first-stage magnetic refrigeration module 11a and the second-stage magnetic refrigeration module 11b is pumped to the regenerator 112 in the first-stage magnetic refrigeration module 11a for cooling, then enters the low-temperature end heat exchanger 20, and after exchanging heat with the air under the action of the low-temperature end fan 40, finally flows into the first liquid storage unit 131. This cycle repeats continuously.

[0061] Those skilled in the art will understand that the above description is based on the heating operation of the magnetic heat pump system. For cooling operation, the high-temperature heat exchanger 30 and the low-temperature heat exchanger 20 are reversed; simply place the low-temperature heat exchanger 20 inside the target space and the high-temperature heat exchanger 30 outdoors. This application will not elaborate further. It should also be noted that the above implementation is based on the example of simultaneously energizing or demagnetizing three magnetic refrigeration modules. However, the application scenarios of this application are not limited to this. In other implementations, those skilled in the art can selectively control the operation of some magnetic refrigeration modules based on requirements. This allows the magnetic heat pump air conditioner to operate within a more suitable temperature range, maximizing its energy efficiency. Furthermore, while or before the magnetic field component energizes and demagnetizes the regenerator, the relevant circulating pumps and valves can be opened, allowing the heat transfer medium at each stage to flow at a small flow rate during energization and demagnetization.

[0062] The above-described configuration, employing a nested Halbach magnet structure to optimize the magnetic field component 111, ensures high magnetic field strength while reducing costs. The inclusion of a heat accumulator 12 allows for sufficient heat exchange of the heat transfer medium, improving system energy efficiency. By providing four ports on the regenerator 112 and four interfaces on the heat accumulator 12, two relatively independent medium flow paths can be formed. This facilitates independent unidirectional flow of the heat transfer medium in each stage of the magnetic refrigeration module during both excitation and demagnetization cooling processes, resulting in pulsed flow of the heat transfer medium within the pipe and reducing flow dead zones. Furthermore, this configuration also helps avoid energy loss caused by heat cancellation when the heat transfer medium flows back and forth in the same path during excitation and demagnetization cooling processes, thereby improving overall system energy efficiency. The inclusion of a one-way valve and an electrically controlled on / off valve allows for control of the heat transfer medium flow direction, further enhancing system operating efficiency. By sequentially increasing or decreasing the Curie temperature of various magnetocaloric working fluids within the regenerator 112, it is beneficial to expand the applicable temperature range of the regenerator 112 and improve its heat exchange efficiency. Furthermore, by sequentially increasing or decreasing the temperature range formed by the Curie temperature of a single magnetocaloric working fluid or multiple magnetocaloric working fluids within the multi-stage magnetic refrigeration module of the regenerator 112 along the direction from the first stage magnetic refrigeration module to the last stage magnetic refrigeration module, the large temperature span between the magnetic refrigeration modules can be increased, thereby improving system energy efficiency.

[0063] It should be noted that the above preferred embodiments are merely illustrative of the principles of this application and are not intended to limit the scope of protection of this application. Without departing from the principles of this application, those skilled in the art can adjust the above settings to make this application applicable to more specific application scenarios.

[0064] For example, in an alternative embodiment, although the above embodiment is described in conjunction with the overlapping of adjacent magnetic refrigeration modules through the heat storage device 12, the overlapping method between adjacent magnetic refrigeration modules is not unique, and those skilled in the art can adjust it. For example, the heat storage device 12 can also be set as a plate heat exchanger, with the two heat exchange flow paths of the plate heat exchanger connected to two adjacent magnetic refrigeration modules respectively; similarly, the heat storage device 12 can also be set as a shell-and-tube heat exchanger or a regenerative heat exchanger. Furthermore, the heat storage device 12 can also be omitted, and instead, some connecting pipes 114 of adjacent magnetic refrigeration units 10 can be nested together to achieve the overlapping arrangement. Moreover, in addition to a hot water storage tank, the heat storage device 12 can also be set as a water tank, with the upper end of the water tank being open or partially open.

[0065] For example, in another alternative embodiment, although the above embodiment is described with the example of the regenerator 112 having four ports, this is only a preferred embodiment, and those skilled in the art can adjust the above embodiment. For example, the regenerator 112 can also be provided with only two ports. In this case, if the heat storage device 12 still retains four interfaces, the first interface 121 and the third interface 123 of the heat storage device 12 can be simultaneously connected to one port of the regenerator 112 of the upper-level magnetic refrigeration module through pipes, and the second interface 122 and the fourth interface 124 of the heat storage device 12 can be simultaneously connected to one port of the regenerator 112 of the lower-level magnetic refrigeration module through pipes, and so on. When the heat storage device 12 also retains only two ports, one port of the regenerator 112 of the upper-level magnetic refrigeration module and one port of the regenerator 112 of the lower-level magnetic refrigeration module can each be connected to one interface of the heat storage device 12. However, both of the above methods will affect the energy efficiency of the system to varying degrees.

[0066] For example, in another alternative embodiment, although the high-temperature heat exchanger 30 and the low-temperature heat exchanger 20 are both described using finned heat exchangers as examples in the above embodiments, their specific forms are not unique, and those skilled in the art can adjust them based on the application scenario. For example, one or both of them can also be replaced with plate heat exchangers, etc.

[0067] For example, in another alternative embodiment, although the above embodiment is described with the example of the low-temperature heat exchanger 20 being located between the fourth port 1124 of the regenerator 112 in the first-stage magnetic refrigeration module 11a and the first liquid storage unit 131, and the high-temperature heat exchanger 30 being located between the second port 1122 and the second liquid storage unit 132 in the last-stage magnetic refrigeration module 11c, the specific positions of the two are not fixed. In other embodiments, the low-temperature heat exchanger 20 may also be located between the first liquid storage unit 131 and the first circulating pump 1131, or between the first circulating pump 1131 and the first port 1121 of the regenerator 112 in the first-stage magnetic refrigeration module 11a, etc. Similarly, the high-temperature heat exchanger 30 may also be located between the second liquid storage unit 132 and the second circulating pump 1132, or between the second circulating pump 1132 and the third port 1123 of the third-stage magnetic refrigeration module 11c, etc.

[0068] For example, in another alternative embodiment, although the above embodiment is described in conjunction with the simultaneous provision of a check valve and an electrically controlled on / off valve, this is only one possible implementation. In other embodiments, those skilled in the art can replace the check valve and the electrically controlled on / off valve, such as replacing the check valve with an electrically controlled on / off valve, or replacing the electrically controlled on / off valve with a check valve that can achieve the corresponding functional flow direction, etc. Furthermore, the use of a solenoid valve as the electrically controlled on / off valve is merely exemplary. In other embodiments, those skilled in the art can adjust the specific form of the electrically controlled on / off valve, such as also using an electrically controlled butterfly valve, an electrically controlled hydraulic valve, etc.

[0069] For example, although the above embodiments are described with reference to the magnetic refrigeration unit 10 including a three-stage magnetic refrigeration module, this is merely exemplary and not intended to limit the scope of protection of this application. In other embodiments, those skilled in the art can adjust the number of magnetic refrigeration modules, for example, the number of magnetic refrigeration modules can also be two-stage, four-stage or more.

[0070] For example, although the above embodiment is described using the example of the connection between the low-temperature heat exchanger 20, the multi-stage magnetic refrigeration module, and the high-temperature heat exchanger 30 via metal pipes, this arrangement is merely exemplary. In another preferred embodiment, those skilled in the art can replace the connecting pipes with traditional loop heat pipes. When using a loop heat pipe, the loop heat pipe includes a condensing section, an evaporating section, and two transition sections. Taking the heating of a magnetic heat pump system as an example, the condensing section corresponds to the pipe where the high-temperature heat exchanger 30 is located, the evaporating section corresponds to the pipe where the magnetic refrigeration unit 10 and the low-temperature heat exchanger 20 are located, and the two transition sections correspond to the pipes connecting the magnetic refrigeration unit 10 and the high-temperature heat exchanger 30 at both ends. In a split-type magnetic heat pump, this pipe is usually represented as a connecting pipe. Conversely, taking a magnetic heat pump system for refrigeration as an example, the evaporation section corresponds to the piping where the low-temperature heat exchanger 20 is located, the condensation section corresponds to the piping where the magnetic refrigeration unit 10 and the high-temperature heat exchanger 30 are located, and the two transition sections correspond to the piping connecting the magnetic refrigeration unit 10 and the low-temperature heat exchanger 20 at both ends. In a split-type magnetic heat pump, this piping is usually represented as a connecting pipe. This replacement method, using a loop heat pipe to connect the low-temperature heat exchanger 20, the multi-stage magnetic refrigeration module, and the high-temperature heat exchanger 30, can significantly improve heat exchange efficiency and reduce energy consumption.

[0071] For example, the above embodiment is illustrated by the example of a single regenerator 112 being filled with a magnetocaloric working fluid whose Curie temperature increases or decreases sequentially, while the temperature range corresponding to the regenerators 112 of the multi-stage magnetic refrigeration module increases or decreases sequentially. However, this is only a preferred embodiment, and those skilled in the art can flexibly adjust it according to specific needs. For example, each regenerator 112 may be filled with only one type of magnetocaloric working fluid, but the Curie temperatures of multiple regenerators 112 may increase or decrease sequentially.

[0072] Of course, the alternative implementation methods described above, as well as the alternative implementation methods and preferred implementation methods, can be used in combination to create new implementation methods that are suitable for more specific application scenarios.

[0073] The following reference Figure 3 and Figure 4 Other embodiments of the magnetic heat pump system of this application will be described.

[0074] First refer to Figure 3 In the second embodiment, compared to the first embodiment, the main difference is that the pump body in each magnetic refrigeration module is replaced by a bidirectional piston pump, thus omitting the first liquid storage component 131 and the second liquid storage component 132. Specifically, the bidirectional piston pump in this application has two independent liquid storage chambers separated by a piston in its cylinder. One liquid storage chamber is provided with a first liquid inlet 1151 and a first liquid outlet 1152, and the other liquid storage chamber is provided with a second liquid inlet 1153 and a second liquid outlet 1154. When the piston slides in the cylinder, the volume of the two liquid storage chambers changes accordingly. Since the internal cavity of the bidirectional piston pump is large enough, it can replace the first liquid storage component 131 and the second liquid storage component 132 to store the heat transfer medium. Furthermore, the first liquid inlet 1151 is connected to the fourth port 1124 of the regenerator 112, and the second liquid inlet 1153 is connected to the second port 1122 of the regenerator 112. Except for the first-stage magnetic refrigeration module 11a, the first liquid outlet 1152 is connected to the fourth interface 124 of the heat storage unit 12. Except for the last-stage magnetic refrigeration module 11c, the second liquid outlet 1154 is connected to the first interface 121 of the heat storage unit 12. In the first-stage magnetic refrigeration module 11a, the first liquid outlet 1152 of the bidirectional piston pump is connected to the first port 1121 of the regenerator 112, and in the last-stage magnetic refrigeration module 11c, the second liquid outlet 1154 of the bidirectional piston pump is connected to the third port 1123 of the regenerator 112.

[0075] The low-temperature heat exchanger 20 is located between the fourth port 1124 of the regenerator 112 in the first-stage magnetic refrigeration module 11a and the first liquid inlet 1151 of the bidirectional piston pump. The high-temperature heat exchanger 30 is located between the second port 1122 of the regenerator 112 in the last-stage magnetic refrigeration module 11c and the second liquid inlet 1153 of the bidirectional piston pump.

[0076] Similar to the previous embodiment, each magnetic refrigeration module in this embodiment is also equipped with four valve bodies, namely a first one-way valve 141, a second one-way valve 142, a first electrically controlled on / off valve 151, and a second electrically controlled on / off valve 152, and their setting principle is the same as that of the previous embodiment. Specifically, for the first-stage magnetic refrigeration module 11a, the first one-way valve 141 is located between the first liquid outlet 1152 of the bidirectional piston pump and the first port 1121 of the regenerator 112. For the second-stage magnetic refrigeration module 11b and the third-stage magnetic refrigeration module 11c, the first one-way valve 141 is located between the first liquid outlet 1152 of the bidirectional piston pump and the fourth port 124 of the heat accumulator 12. For the first-stage magnetic refrigeration module 11a and the second-stage magnetic refrigeration module 11b, the second one-way valve 142 is located between the second outlet 1154 of the bidirectional piston pump and the first interface 121 of the heat accumulator 12. For the third-stage magnetic refrigeration module 11c, the second one-way valve 142 is located between the second outlet 1154 of the bidirectional piston pump and the third port 1123 of the regenerator 112. For the first-stage magnetic refrigeration module 11a and the second-stage magnetic refrigeration module 11b, the first electrically controlled on / off valve 151 is located between the second port 1122 of the regenerator 112 and the second inlet 1153 of the bidirectional piston pump. For the third-stage magnetic refrigeration module 11c, the first electrically controlled on / off valve 151 is located between the second port 1122 of the regenerator 112 and the high-temperature end heat exchanger 30. For the first-stage magnetic refrigeration module 11a, the second electronic on / off valve 152 is located between the fourth port 1124 of the regenerator 112 and the low-temperature heat exchanger 20. For the second-stage magnetic refrigeration module 11b and the third-stage magnetic refrigeration module 11c, the second electronic on / off valve 152 is located between the fourth port 1124 of the regenerator 112 and the first liquid inlet 1151 of the bidirectional piston pump.

[0077] Of course, the positions of the valve bodies can also be adjusted. For example, the first electrically controlled on / off valve 151 in the third-stage magnetic refrigeration module 11c can be positioned between the second liquid inlet 1153 of the bidirectional piston pump and the high-temperature heat exchanger 30; the second electronic on / off valve 152 in the first-stage magnetic refrigeration module 11a can be positioned between the first liquid inlet 1151 of the bidirectional piston pump and the low-temperature heat exchanger 20; for the second-stage magnetic refrigeration module 11b and the third-stage magnetic refrigeration module 11c, the first one-way valve 141 can be positioned between the second interface 122 of the heat accumulator 12 and the first port 1121 of the regenerator 112; for the first-stage magnetic refrigeration module 11a and the second-stage magnetic refrigeration module 11b, the first one-way valve 142 can be positioned between the third interface 123 of the heat accumulator 12 and the third port 1123 of the regenerator 112, etc.

[0078] Taking the heating operation of the magnetic heat pump system as an example, the working principle of this embodiment is as follows: First, the magnetic field components 111 of the first-stage magnetic refrigeration module 11a, the second-stage magnetic refrigeration module 11b, and the third-stage magnetic refrigeration module 11c are controlled to operate, causing all rotating magnets to rotate at a specific angle. At this time, the magnetic field components 111 generate magnetic fields to excite the magnetic thermal working fluid in their respective regenerators 112. Then, the three bidirectional piston pumps are controlled to operate, and the three first electrically controlled on / off valves 151 in the three magnetic refrigeration modules are controlled to open simultaneously, while the three second electrically controlled on / off valves 152 in the three magnetic refrigeration modules are controlled to close. At this time, the heat transfer medium in the three-stage magnetic refrigeration modules flows synchronously for heat exchange. Among them, the heat transfer medium in the first-stage magnetic refrigeration module 11a is supplied by a liquid storage chamber of the bidirectional piston pump of this stage (…). Figure 3 The liquid flows out of the left chamber shown and heats up after passing through the regenerator 112, then flows into the other storage chamber of the bidirectional piston pump. Figure 3 The heat transfer medium (as shown in the right cavity) eventually flows into the accumulator 12 between the first-stage magnetic refrigeration module 11a and the second-stage magnetic refrigeration module 11b, heating the heat transfer medium. Simultaneously, the heat transfer medium in the second-stage magnetic refrigeration module 11b is pumped by a storage chamber of the bidirectional piston pump of that stage. Figure 3 The heat transfer medium (shown in the right cavity) flows out to the heat accumulator 12 between the first-stage magnetic refrigeration module 11a and the second-stage magnetic refrigeration module 11b for heating. Then, the heat transfer medium is transported to the regenerator 112 of the second-stage magnetic refrigeration module 11b for further heating. The heated heat transfer medium then flows into another storage cavity of the bidirectional piston pump. Figure 3 The fluid (shown in the left cavity) eventually flows into the accumulator 12 between the second-stage magnetic refrigeration module 11b and the third-stage magnetic refrigeration module 11c. Simultaneously, the heat transfer medium in the third-stage magnetic refrigeration module 11c is pumped by a storage chamber of the bidirectional piston pump of that stage. Figure 3 The heat transfer medium (shown in the left cavity) flows out to the heat accumulator 12 between the second-stage magnetic refrigeration module 11b and the third-stage magnetic refrigeration module 11c for heating. Then, the heat transfer medium is transported to the regenerator 112 of the third-stage magnetic refrigeration module 11c for further heating. The heated heat transfer medium flows into the high-temperature end heat exchanger 30 to participate in heat exchange. After heat exchange, the heat transfer medium flows to the other liquid storage chamber of the bidirectional piston pump (shown in the left cavity). Figure 3 (Right cavity shown).

[0079] Next, the magnetic field components 111 of the first-stage magnetic refrigeration module 11a, the second-stage magnetic refrigeration module 11b, and the third-stage magnetic refrigeration module 11c continue to operate, causing all rotating magnets to continue rotating at a specific angle. At this time, the magnetic field components 111 generate magnetic fields to demagnetize the magnetothermal working fluid in their respective regenerators 112. Then, the three bidirectional piston pumps are controlled to operate independently, and the three second electrically controlled on / off valves 152 in the three magnetic refrigeration modules are simultaneously opened, while the three first electrically controlled on / off valves 151 in the three magnetic refrigeration modules are controlled to close. At this time, the heat transfer medium in the three-stage magnetic refrigeration modules flows synchronously for heat exchange. Specifically, the heat transfer medium in the third-stage magnetic refrigeration module 11c is supplied by a liquid storage chamber of the bidirectional piston pump of this stage (…). Figure 3 The liquid flows out of the right cavity shown and is cooled after passing through the regenerator 112 of the third-stage magnetic refrigeration module 11c, before flowing into the other storage cavity of the bidirectional piston pump. Figure 3 The fluid (shown in the left cavity) eventually flows into the accumulator 12 between the second-stage magnetic refrigeration module 11b and the third-stage magnetic refrigeration module 11c, cooling the heat transfer medium. Simultaneously, the heat transfer medium in the second-stage magnetic refrigeration module 11b is pumped by a storage chamber of the bidirectional piston pump in that stage. Figure 3 The heat transfer medium (shown in the left cavity) flows out to the heat accumulator 12 between the second-stage magnetic refrigeration module 11b and the third-stage magnetic refrigeration module 11c for cooling. Then, the heat transfer medium is transported to the regenerator 112 of the second-stage magnetic refrigeration module 11b for further cooling. The cooled heat transfer medium flows into another storage chamber of the bidirectional piston pump. Figure 3 The heat transfer medium (as shown in the right cavity) eventually flows into the accumulator 12 between the first-stage magnetic refrigeration module 11a and the second-stage magnetic refrigeration module 11b. Simultaneously, the heat transfer medium in the first-stage magnetic refrigeration module 11a is pumped by a bidirectional piston pump from one of its storage chambers (…). Figure 3 The heat transfer medium (shown in the right cavity) flows out to the heat accumulator 12 between the first-stage magnetic refrigeration module 11a and the second-stage magnetic refrigeration module 11b for cooling. Then, the heat transfer medium is transported to the regenerator 112 of the first-stage magnetic refrigeration module 11a for further cooling. The cooled heat transfer medium flows into the low-temperature end heat exchanger 20 to participate in heat exchange. After heat exchange, the heat transfer medium flows to the other liquid storage chamber of the bidirectional piston pump (shown in the right cavity). Figure 4 (The left cavity is shown). This process is repeated continuously.

[0080] By using a bidirectional piston pump as the pump body, the internal cavity of the double-effect piston pump is larger and can be used as a storage chamber for the heat exchange medium. Therefore, the liquid storage device for the heat exchange medium can be saved, and the complexity of the system can be reduced.

[0081] This embodiment is described using the simultaneous energization or demagnetization of three magnetic refrigeration modules as an example. However, the application scenarios of this application are not limited to this. In other embodiments, those skilled in the art can selectively control the operation of some magnetic refrigeration modules based on requirements. This allows the magnetic heat pump air conditioner to operate within a more suitable temperature range, thereby maximizing its energy efficiency. Furthermore, while or before the magnetic field components energize and demagnetize the regenerator, the relevant circulating pumps and valves can be opened, allowing the heat transfer medium in each stage to flow at a small flow rate during energization and demagnetization.

[0082] See next. Figure 4 ,exist ​ The third embodiment shown differs from the second embodiment in that the specific locations of the low-temperature heat exchanger and the high-temperature heat exchanger are adjusted. Specifically, the low-temperature heat exchanger 20 is located between the first port 1121 of the regenerator 112 in the first-stage magnetic refrigeration module 11a and the first outlet 1152 of the bidirectional piston pump, and the high-temperature heat exchanger 30 is located between the third port 1123 of the regenerator 112 in the third-stage magnetic refrigeration module 11c and the second outlet 1154 of the bidirectional piston pump.

[0083] The specific principle of this implementation method is similar to that of the second implementation method, and will not be repeated here.

[0084] Those skilled in the art will understand that although some embodiments described herein include certain features included in other embodiments but not others, combinations of features from different embodiments are intended to be within the scope of this application and form different embodiments. For example, any of the claimed embodiments in the claims of this application can be used in any combination.

[0085] The technical solutions of this application have been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of this application is obviously not limited to these specific embodiments. Without departing from the principles of this application, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of this application.

Claims

1. A magnetic heat pump system, characterized by, The magnetic heat pump system comprises: a magnetic refrigeration unit, which comprises multiple-stage magnetic refrigeration modules arranged in sequence, each stage of the magnetic refrigeration modules comprises a magnetic field assembly, a regenerator, a pump body and a connecting pipeline, wherein adjacent magnetic refrigeration modules are arranged in cascade with each other; a low-temperature end heat exchanger, which communicates with a first-stage magnetic refrigeration module in the multiple-stage magnetic refrigeration modules; a high-temperature end heat exchanger, which communicates with a last-stage magnetic refrigeration module in the multiple-stage magnetic refrigeration modules.

2. The magnetic heat pump system of claim 1, wherein, The magnetic refrigeration unit further comprises a regenerator, and adjacent magnetic refrigeration modules are arranged in cascade through the regenerator.

3. The magnetic heat pump system of claim 2, wherein, The regenerator has a first port and a second port, the regenerator has a first interface and a second interface, in adjacent magnetic refrigeration modules, the second port of the regenerator at the upper stage communicates with the first interface of the regenerator, and the first port of the regenerator at the lower stage communicates with the second interface of the regenerator.

4. The magnetic heat pump system of claim 3, wherein, The regenerator further has a third port and a fourth port, and the regenerator further has a third interface and a fourth interface, in adjacent magnetic refrigeration modules, the third port of the regenerator at the upper stage communicates with the third interface of the regenerator, and the fourth port of the regenerator at the lower stage communicates with the fourth interface of the regenerator.

5. The magnetic heat pump system of any one of claims 2 to 4, wherein, The regenerator is a regenerative water tank, and the regenerative water tank forms a liquid mixing cavity; or The regenerator is a plate heat exchanger, a double-pipe heat exchanger or a regenerative heat exchanger.

6. The magnetic heat pump system of claim 4, wherein, The pump body comprises a first circulating pump and a second circulating pump, the magnetic refrigeration unit further comprises a first liquid storage member and a second liquid storage member, the discharge port of the first circulating pump communicates with the first port of the regenerator, the inlet port of the first circulating pump communicates with the second interface of the regenerator except for the first-stage magnetic refrigeration module, the discharge port of the second circulating pump communicates with the third port of the regenerator, the inlet port of the second circulating pump communicates with the third interface of the regenerator except for the last-stage magnetic refrigeration module, the first liquid storage member is arranged between the fourth port of the regenerator in the first-stage magnetic refrigeration module and the inlet port of the first circulating pump, and the second liquid storage member is arranged between the second port of the regenerator in the last-stage magnetic refrigeration module and the inlet port of the second circulating pump.

7. The magnetic heat pump system of claim 6, wherein, The low-temperature end heat exchanger is arranged between the fourth port of the regenerator in the first-stage magnetic refrigeration module and the first liquid storage member, and the high-temperature end heat exchanger is arranged between the second port of the regenerator in the last-stage magnetic refrigeration module and the second liquid storage member.

8. The magnetic heat pump system of claim 4, wherein, The pump body is a bidirectional piston pump having two liquid storage cavities independent of each other, one of which is provided with a first liquid inlet and a first liquid outlet, and the other is provided with a second liquid inlet and a second liquid outlet, the first liquid inlet is communicated with the fourth port of the regenerator, the second liquid inlet is communicated with the second port of the regenerator, the first liquid outlet is communicated with the fourth interface of the regenerator except the first-stage magnetic refrigeration module, the second liquid outlet is communicated with the first interface of the regenerator except the last-stage magnetic refrigeration module, the first liquid outlet of the bidirectional piston pump in the first-stage magnetic refrigeration module is communicated with the first port of the regenerator, and the second liquid outlet of the bidirectional piston pump in the last-stage magnetic refrigeration module is communicated with the third port of the regenerator.

9. The magnetic heat pump system of claim 8, wherein, The low-temperature end heat exchanger is arranged between the first port of the regenerator and the first liquid outlet of the bidirectional piston pump in the first-stage magnetic refrigeration module, and the high-temperature end heat exchanger is arranged between the third port of the regenerator and the second liquid outlet of the bidirectional piston pump in the last-stage magnetic refrigeration module; or The low-temperature end heat exchanger is arranged between the fourth port of the regenerator and the first liquid inlet of the bidirectional piston pump in the first-stage magnetic refrigeration module, and the high-temperature end heat exchanger is arranged between the second port of the regenerator and the second liquid inlet of the bidirectional piston pump in the last-stage magnetic refrigeration module.

10. The magnetic heat pump system of claim 4, wherein, A one-way valve or an electrically controlled on-off valve is arranged at the first port of the regenerator, wherein the one-way valve is configured to be turned on when the heat exchange working medium flows into the regenerator from the first port; and / or A one-way valve or an electrically controlled on-off valve is arranged at the second port of the regenerator, wherein the one-way valve is configured to be turned on when the heat exchange working medium flows out of the regenerator from the second port; and / or A one-way valve or an electrically controlled on-off valve is arranged at the third port of the regenerator, wherein the one-way valve is configured to be turned on when the heat exchange working medium flows into the regenerator from the third port; and / or A one-way valve or an electrically controlled on-off valve is arranged at the fourth port of the regenerator, wherein the one-way valve is configured to be turned on when the heat exchange working medium flows out of the regenerator from the fourth port.

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