A magnetic heat pump coupled with a loop heat pipe

Abstract

The present invention discloses a magnetic heat pump coupled with a loop heat pipe, comprising a loop heat pipe body, a liquid wick, a magnetocaloric material, a barrier filter, a thermal switch, a fluid working medium, and a magnet assembly. The loop heat pipe body is divided into a cold end, a steam pipeline, a hot end, a liquid pipeline, and a liquid storage area. The cold end, the liquid storage area, and the liquid pipeline are all equipped with a liquid wick. The steam pipeline is encapsulated within a barrier filter with n sections of magnetocaloric material. The thermal switch only allows one-way flow of the fluid working medium. The present invention widens the temperature range by gradually magnetizing from the cold end to each level of magnetocaloric material and then to the hot end, and then gradually demagnetizing from the hot end to each level of magnetocaloric material and then to the cold end. When the ambient temperature near the cold end is maintained constant, a heating mode is achieved, and when the ambient temperature near the hot end is maintained constant, a cooling mode is achieved. The present invention couples the magnetocaloric material within the loop heat pipe, rapidly completing inter-stage heat recovery through phase change heat transfer of the fluid working medium, thereby improving heat exchange efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of magnetic heat pumps, and in particular to a magnetic heat pump coupled with a loop heat pipe. Background Art

[0002] Magnetic heat pumps utilize the magnetocaloric effect of magnetocaloric materials to achieve cooling or heating. When magnetized, these materials release heat, enabling heating. When demagnetized, they absorb heat, enabling cooling. Magnetic heat pumps offer advantages such as environmental friendliness, energy efficiency, safety, and reliability. They represent one of the most promising new heat pump technologies to replace vapor compression heat pump cycles.

[0003] Because the adiabatic temperature change of single-stage magnetocaloric materials is extremely limited, heat regeneration is needed to broaden the system's temperature range. In the field of room-temperature magnetic refrigeration technology, the vast majority of room-temperature magnetic refrigeration cycles are based on the principle of active magnetic regenerators. However, active magnetic refrigeration cycles suffer from low convective heat transfer coefficients, large heat regeneration losses, slow heat regeneration rates, low operating frequencies, and low energy efficiency. Therefore, strengthening the heat regeneration process between magnetocaloric materials and increasing the system's operating frequency are crucial for improving cycle performance.

[0004] Phase-change heat transfer is a widely used heat pipe enhancement method. The high heat transfer efficiency of heat pipes is expected to resolve inherent problems in traditional active magnetic regenerators. A method for processing a heat pipe assembly with magnetic refrigeration (201710412043.4) was developed. This invention embeds magnetocaloric material in a wick. Due to the low capillary suction force of the magnetocaloric material, the wick's inherent good capillary properties are compromised. Furthermore, the valve assemblies arranged on both sides of the magnetocaloric effect pipe segment isolate the wick, weakening the capillary properties of the wick at the connection between the valve assembly and the pipe body. Furthermore, due to the geometric dimensions of the wick, the amount of magnetocaloric material required is relatively small, further limiting the refrigeration effect achievable by this invention. A room-temperature magnetic refrigeration device and refrigeration method coupled with a gravity heat pipe (202110711664.9) uses internal heat exchange plates to achieve inter-stage heat recovery. Each level of the magnetic thermal gravity heat pipe is separated by an independent gravity heat pipe section. The low thermal conductivity of the internal heat exchange plates and their extremely small heat exchange surface area are significant factors limiting the heat recovery efficiency of this invention. Therefore, the key technical problem addressed by this invention is how to design a magnetic heat pump device with efficient heat transfer, simple structure, and a large cooling or heating capacity. Summary of the Invention

[0005] The purpose of the present invention is to solve the above-mentioned key technical problems and provide a magnetic heat pump coupled with a loop heat pipe, which couples magnetocaloric material inside the loop heat pipe, improves the heat exchange efficiency between the magnetocaloric material and the fluid working medium through phase change heat transfer, improves the operating frequency, and increases the cooling / heating capacity; at the same time, due to the gas-liquid pipeline separation design of the loop heat pipe, the steam channel and the liquid reflux channel do not interfere with each other, which is conducive to simplifying the system structure and utilizing multi-stage magnetocaloric material to broaden the total temperature span of the system operation.

[0006] The present invention is achieved through at least one of the following technical solutions.

[0007] A magnetic heat pump coupled to a loop heat pipe comprises a loop heat pipe body, a liquid wick, a magnetocaloric material, a barrier filter, a thermal switch, a fluid working medium, and a magnet group; the barrier filter encapsulates the magnetocaloric material within the loop heat pipe body; thermal switches are provided on both sides of the magnetocaloric material, and the fluid working medium is filled within the evacuated loop heat pipe; the liquid wick is provided within the loop heat pipe body, and the magnet group is located outside the magnetocaloric material area.

[0008] Furthermore, the loop heat pipe body is composed of a cold end, a steam pipeline, a hot end, a liquid pipeline and a liquid storage area in the axial direction; the liquid storage area is provided between the liquid pipeline and the cold end, thereby forming a complete loop heat pipe body;

[0009] The cold end, the liquid storage area and the liquid pipeline are all provided with a liquid wick;

[0010] The steam pipeline is provided with a barrier filter screen encapsulating n sections of magnetocaloric material areas, which are, from the cold end to the hot end, a first-level magnetocaloric material area, a second-level magnetocaloric material area, ..., an n-level magnetocaloric material area;

[0011] The magnet group is placed outside the magnetocaloric material area at each level;

[0012] The fluid working medium is filled in the vacuumed loop heat pipe, part of which is located in the liquid storage area, and part of which is adsorbed in the various levels of magnetic thermal material areas and the liquid absorption core.

[0013] Furthermore, the Curie temperatures of the magnetocaloric materials at each level match the operating temperatures of each level.

[0014] Furthermore, thermal switches are provided between each section of the magnetocaloric material area and between the cold end, the hot end and the magnetocaloric material area.

[0015] Furthermore, the magnetocaloric material is encapsulated inside the steam pipeline through the lower barrier filter and the upper barrier filter.

[0016] Furthermore, the steam pipeline, liquid pipeline and liquid storage area pipe body are made of non-metallic pipes such as plastic and glass, and the cross-sectional shape is circular or rectangular.

[0017] Furthermore, the liquid wick is made of alumina foam ceramics or copper braided mesh.

[0018] Furthermore, the magnetocaloric material is granular Gd, Gd-based alloy, or La-Fe-Si alloy;

[0019] The barrier filter is a braided wire mesh made of copper or stainless steel.

[0020] Furthermore, the thermal switch is a one-way valve or a solenoid valve.

[0021] Further, the specific operation method:

[0022] Magnetization is sequentially applied from the primary magnetocaloric material to the nth level magnetocaloric material. First, the primary magnetocaloric material area is magnetized. The fluid adsorbed in the primary magnetocaloric material area absorbs the heat of the primary magnetocaloric material and evaporates. The steam quickly passes through the heat switch between the primary magnetocaloric material area and the secondary magnetocaloric material area and is transferred to the secondary magnetocaloric material area. It is condensed into liquid by the secondary magnetocaloric material and adsorbed inside the secondary magnetocaloric material area. In this process, the heat released by the magnetization of the primary magnetocaloric material is quickly transferred to the secondary magnetocaloric material area. The heat generated by the magnetocaloric material after magnetization is transferred from the first-level magnetocaloric material to the n-level magnetocaloric material step by step. Finally, after the n-level magnetocaloric material area is magnetized, the fluid working medium adsorbed in the n-level magnetocaloric material area absorbs the heat of the n-level magnetocaloric material and evaporates. The vapor quickly passes through the heat switch n+1 and is transferred to the hot end, dissipates heat to the environment and condenses into liquid. The liquid working medium flows back to the liquid storage area along the liquid pipeline with the assistance of the liquid wick, and continuously compensates the fluid working medium to the cold end under the capillary action of the liquid wick.

[0023] Subsequently, demagnetization is carried out from the n-level magnetocaloric material to the first-level magnetocaloric material. First, the n-level magnetocaloric material is demagnetized and cooled. Driven by the temperature difference, the fluid working medium adsorbed in the n-1-level magnetocaloric material area absorbs the heat of the n-1-level magnetocaloric material and evaporates. The steam quickly passes through the heat switch n and is transferred to the n-level magnetocaloric material area. It is condensed into liquid by the n-level magnetocaloric material and adsorbed inside the n-level magnetocaloric material area. In this process, the n-1-level magnetocaloric material is cooled because the heat is taken away by the steam. By analogy, the temperature drop generated by the magnetocaloric material after demagnetization causes the heat to be transferred upward step by step. After the last-level magnetocaloric material area is demagnetized and cooled, the fluid working medium in the cold end absorbs the ambient heat driven by the temperature difference and evaporates. The steam passes through the heat switch between the cold end and the first-level magnetocaloric material area and is transferred to the first-level magnetocaloric material area. It is condensed into liquid by the first-level magnetocaloric material and adsorbed inside the first-level magnetocaloric material area.

[0024] When the cold end is maintained at a constant ambient temperature, the magnetic heat pump coupled with the loop heat pipe realizes the heating mode, and the above process is repeated to achieve continuous heating; when the hot end is maintained at a constant ambient temperature, the magnetic heat pump coupled with the loop heat pipe realizes the cooling mode, and the above process is repeated to achieve continuous cooling.

[0025] The beneficial effects of the present invention are: coupling magnetocaloric material inside the loop heat pipe, improving the heat exchange efficiency between the magnetocaloric material and the fluid working medium through phase change heat transfer, improving the operating frequency, and increasing the cooling / heating capacity; at the same time, due to the gas-liquid pipeline separation design of the loop heat pipe, the steam channel and the liquid reflux channel do not interfere with each other, which is conducive to simplifying the system structure and utilizing multi-level magnetocaloric material to broaden the total temperature span of the system operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly describes the drawings required for describing the embodiments. Obviously, the drawings described only illustrate some embodiments of the present invention, not all of them. Those skilled in the art can derive other design solutions and drawings based on these drawings without inventive effort.

[0027] Figure 1 Schematic diagram of the structure of a magnetic heat pump with a first-level coupled loop heat pipe according to an embodiment of the present invention;

[0028] Figure 2 This is a schematic diagram of the operating principle of a magnetic heat pump with a first-level coupled loop heat pipe according to an embodiment of the present invention;

[0029] Figure 3 Schematic diagram of the structure of a magnetic heat pump with a two-stage coupled loop heat pipe according to an embodiment of the present invention;

[0030] Figure 4 This is a schematic diagram of the operating principle of a magnetic heat pump with a two-stage coupled loop heat pipe according to an embodiment of the present invention;

[0031] Figure 5 is a cross-sectional view of an annular absorbent core according to an embodiment of the present invention;

[0032] Figure 6 2 is a cross-sectional view of a barrier absorbent core according to an embodiment of the present invention. DETAILED DESCRIPTION

[0033] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but the present invention is not limited thereto.

[0034] The present invention takes a magnetic heat pump with a first-stage coupled loop heat pipe and a magnetic heat pump with a second-stage coupled loop heat pipe as specific implementation methods, and the implementation methods can be extended to a magnetic heat pump with a multi-stage coupled loop heat pipe according to actual conditions.

[0035] Example 1

[0036] like Figure 1 As shown, a magnetic heat pump with a first-stage coupled loop heat pipe includes a loop heat pipe body 1, a first thermal switch 501, a second thermal switch 502, a fluid working medium and a magnet group 6.

[0037] Specifically, the loop heat pipe body 1 is divided into a cold end 7, a steam pipe 8, a hot end 9, a liquid pipe 10 and a liquid storage area 11;

[0038] Specifically, the cold end 7, the liquid storage area 11 and the liquid pipeline 10 are all provided with an annular liquid absorbent core 201; a barrier liquid absorbent core 202 is also provided between the cold end 7 and the liquid storage area 11;

[0039] Specifically, the interior of the steam pipeline 8 is encapsulated with the magnetocaloric material 3 by the lower barrier filter 401 and the upper barrier filter 402, which together form the magnetocaloric material area 12;

[0040] Specifically, the lower barrier filter 401 and the upper barrier filter 402 are located at both ends of the magnetocaloric material 3 and are tightly bonded to the inner wall of the loop heat pipe body 1.

[0041] Specifically, the first thermal switch 501 is located between the cold end 7 and the magnetocaloric material area 12, and only allows the fluid to flow from the cold end 7 to the magnetocaloric material area 12 in one direction; the second thermal switch 502 is located between the magnetocaloric material area 12 and the hot end 9, and only allows the fluid to flow from the magnetocaloric material area 12 to the hot end 9 in one direction;

[0042] Specifically, the fluid is filled in the vacuumed loop heat pipe body 1, with most of it located in the liquid storage area 11, and part of it being absorbed in the magnetocaloric material area 12 and the annular wick 201 and the barrier wick 202;

[0043] Specifically, the magnet group 6 is placed outside the magnetocaloric material area 12 .

[0044] As an embodiment, the cold end 7 and the hot end 9 tube bodies are made of metal tubes such as copper and stainless steel, and the cross-sectional shape is circular, rectangular, etc.;

[0045] The pipe bodies of the steam pipeline 8, the liquid pipeline 10, and the liquid storage area 11 are made of non-metallic pipes such as plastic and glass, and have a circular or rectangular cross-sectional shape.

[0046] The annular wick 201 and the barrier wick 202 are made of alumina foam ceramics, copper woven mesh, etc.

[0047] The magnetocaloric material 3 is granular Gd, Gd-based alloy, La-Fe-Si alloy, etc.

[0048] The lower barrier filter 401 and the upper barrier filter 402 are made of copper or stainless steel woven wire mesh; the first thermal switch 501 and the second thermal switch 502 are one-way valves or solenoid valves;

[0049] The fluid working medium is water, methanol, etc.; the magnet group 6 is a permanent magnet or an electromagnetic field.

[0050] like Figure 2 As shown, the operation process of a magnetic heat pump with a first-stage coupled loop heat pipe of the present invention is as follows:

[0051] First, the magnetocaloric material 3 is magnetized by the magnet group 6, and its temperature rises. The fluid working medium adsorbed in the magnetocaloric material area 12 absorbs the heat of the magnetocaloric material 3 and evaporates. The vapor quickly passes through the second thermal switch 502 and is transferred to the hot end 9, where the heat is released to the environment and condensed into liquid. The condensed liquid working medium flows back to the liquid storage area 11 along the liquid pipeline under the capillary force of the annular liquid wick 201. In this process, the heat of the magnetocaloric material 3 after magnetization is quickly transferred to the environment, and the temperature of the magnetocaloric material 3 decreases. Subsequently, the magnet group 6 is removed, the magnetocaloric material 3 is demagnetized, and the temperature further decreases. The annular liquid wick 201 in the cold end is Driven by the temperature difference, the adsorbed liquid working medium absorbs the ambient heat and evaporates. The vapor quickly passes through the first thermal switch 501 and is transferred to the magnetocaloric material area 12. In the magnetocaloric material area 12, the heat is released to the magnetocaloric material 3 and condensed into liquid. The condensed liquid working medium is adsorbed inside the magnetocaloric material area 12. In this process, the ambient heat is quickly transferred to the magnetocaloric material 3, and the temperature of the magnetocaloric material 3 increases. During the above operation, the liquid working medium in the liquid storage area 11 continuously compensates the fluid working medium to the cold end 7 under the capillary force of the barrier wick 202 and the annular wick 201, thereby forming a complete cycle.

[0052] During the above operation, when the ambient temperature near the cold end 7 is maintained constant, the magnetic heat pump of the first-level coupled loop heat pipe realizes the heating mode; when the ambient temperature near the hot end 9 is maintained constant, the magnetic heat pump of the first-level coupled loop heat pipe realizes the cooling mode.

[0053] Example 2

[0054] like Figure 3 As shown, a magnetic heat pump with a two-stage coupled loop heat pipe includes a loop heat pipe body 1, an annular liquid wick 201, a barrier liquid wick 202, a primary magnetocaloric material 301, a secondary magnetocaloric material 302, a primary lower barrier filter 401, a primary upper barrier filter 402, a secondary lower barrier filter 403, a secondary upper barrier filter 404, a first thermal switch 501, a second thermal switch 502, a third thermal switch 503, a fluid working medium, a primary magnet group 601 and a secondary magnet group 602.

[0055] Specifically, the loop heat pipe body 1 is divided into a cold end 7, a steam pipe 8, a hot end 9, a liquid pipe 10 and a liquid storage area 11;

[0056] Specifically, the cold end 7, the liquid storage area 11 and the liquid pipeline 10 are all provided with an annular liquid absorbent core 201; a barrier liquid absorbent core 202 is also provided between the cold end 7 and the liquid storage area 11;

[0057] Specifically, the steam pipe 8 is encapsulated with the first-level magnetocaloric material 301 by the first-level lower barrier filter 401 and the first-level upper barrier filter 402, together forming the first-level magnetocaloric material area 1201; the second-level magnetocaloric material 302 is encapsulated by the second-level lower barrier filter 403 and the second-level upper barrier filter 404, together forming the second-level magnetocaloric material area 1202;

[0058] Specifically, the Curie temperature of the primary magnetocaloric material 301 matches the primary operating temperature; the Curie temperature of the secondary magnetocaloric material 302 matches the secondary operating temperature;

[0059] Specifically, the first-level lower barrier filter 401 and the first-level upper barrier filter 402 are located at both ends of the first-level magnetocaloric material 301, and are tightly bonded to the inner wall of the loop heat pipe body 1 on all sides; the second-level lower barrier filter 403 and the second-level upper barrier filter 404 are located at both ends of the second-level magnetocaloric material 302, and are tightly bonded to the inner wall of the loop heat pipe body 1 on all sides;

[0060] Specifically, the first thermal switch 501 is located between the cold end 7 and the primary magnetocaloric material area 1201, and only allows the fluid working medium to flow in one direction from the cold end 7 to the primary magnetocaloric material area 1201; the second thermal switch 502 is located between the primary magnetocaloric material area 1201 and the secondary magnetocaloric material area 1202, and only allows the fluid working medium to flow in one direction from the primary magnetocaloric material area 1201 to the secondary magnetocaloric material area 1202; the third thermal switch 503 is located between the secondary magnetocaloric material area 1202 and the hot end 9, and only allows the fluid working medium to flow in one direction from the secondary magnetocaloric material area 1202 to the hot end 9;

[0061] Specifically, the fluid is filled in the vacuumed loop heat pipe body 1, with most of it located in the liquid storage area 11, and part of it is adsorbed in the first-level magnetocaloric material area 1201, the second-level magnetocaloric material area 1202, the annular liquid wick 201, and the barrier liquid wick 202.

[0062] Specifically, the primary magnet group 601 is placed outside the primary magnetocaloric material area 1201 , and the secondary magnet group 602 is placed outside the secondary magnetocaloric material area 1202 .

[0063] Preferably, the cold end 7 and the hot end 9 are made of metal pipes such as copper and stainless steel, and the cross-sectional shape is circular or rectangular; the steam pipe 8, the liquid pipe 10, and the liquid storage area 11 are made of non-metallic pipes such as plastic and glass, and the cross-sectional shape is circular or rectangular; the annular wick 201 and the barrier wick 202 are made of alumina foam ceramics, copper braided mesh, etc.; the primary magnetocaloric material 301 and the secondary magnetocaloric material 302 are granular Gd, Gd-based alloy , La-Fe-Si alloy, etc.; the first-level lower barrier filter 401, the first-level upper barrier filter 402, the second-level lower barrier filter 403, and the second-level upper barrier filter 404 are copper or stainless steel woven wire mesh; the first thermal switch 501, the second thermal switch 502, and the third thermal switch 503 are one-way valves or solenoid valves, etc.; the fluid working medium is water, methanol, etc.; the first-level magnet group 601 and the second-level magnet group 602 are permanent magnets or electromagnetic fields.

[0064] like Figure 4 As shown, the operation process of a magnetic heat pump with a two-stage coupled loop heat pipe of the present invention is as follows:

[0065] First, the primary magnetocaloric material 301 is magnetized by the primary magnet group 601, and its temperature rises. The fluid working medium adsorbed in the primary magnetocaloric material area 1201 absorbs the heat of the primary magnetocaloric material 301 and evaporates. The vapor quickly passes through the second thermal switch 502 and is transferred to the secondary magnetocaloric material area 1202. In the secondary magnetocaloric material area 1202, the heat is released to the secondary magnetocaloric material 302 and condensed into liquid. The condensed liquid working medium is adsorbed inside the secondary magnetocaloric material area 1202. In this process, the heat of the primary magnetocaloric material 301 after magnetization is quickly transferred to the secondary magnetocaloric material 302, the temperature of the primary magnetocaloric material 301 decreases, and the temperature of the secondary magnetocaloric material 302 increases. High; Subsequently, the secondary magnetocaloric material 302 is magnetized by the secondary magnet group 602, and the temperature further increases. The fluid working medium adsorbed in the secondary magnetocaloric material area 1202 absorbs the heat of the secondary magnetocaloric material 302 and evaporates. The vapor quickly passes through the third thermal switch 503 and is transferred to the hot end 9, where the heat is released to the environment and condensed into liquid. The condensed liquid working medium flows back to the liquid storage area 11 along the liquid pipeline under the capillary force of the annular liquid wick 201. In this process, the heat of the secondary magnetocaloric material 302 after magnetization is quickly transferred to the environment, and the temperature of the secondary magnetocaloric material 302 decreases; Subsequently, the secondary magnet group 602 is removed, the secondary magnetocaloric material 302 is demagnetized, and the temperature decreases. The temperature is lowered one step further. Driven by the temperature difference, the fluid working medium adsorbed in the primary magnetocaloric material area 1201 absorbs the heat of the primary magnetocaloric material 301 and evaporates. The steam quickly passes through the second thermal switch 502 and is transferred to the secondary magnetocaloric material area 1202. In the secondary magnetocaloric material area 1202, the heat is released to the secondary magnetocaloric material 302 and condensed into liquid. The condensed liquid working medium is adsorbed inside the secondary magnetocaloric material area 1202. In this process, the temperature of the primary magnetocaloric material 301 decreases and the temperature of the secondary magnetocaloric material 302 increases. Finally, the primary magnet group 601 is removed, the primary magnetocaloric material 301 is demagnetized, the temperature is further reduced, and the liquid adsorbent in the annular liquid adsorbent core 201 inside the cold end is heated. Driven by the temperature difference, the attached liquid working fluid absorbs the ambient heat and evaporates, and the vapor quickly passes through the first thermal switch 501 and is transferred to the primary magnetocaloric material area 1201, where the heat is released to the primary magnetocaloric material 301 and condensed into liquid. The condensed liquid working fluid is adsorbed inside the primary magnetocaloric material area 1201. During this process, the ambient heat is quickly transferred to the primary magnetocaloric material 301, and the temperature of the primary magnetocaloric material 301 increases. During the above operation, the liquid working fluid in the liquid storage area 11 continuously compensates the fluid working fluid to the cold end 7 under the capillary force of the barrier wick 202 and the annular wick 201, thereby forming a complete cycle.

[0066] During the above operation, when the ambient temperature near the cold end 7 is maintained constant, the magnetic heat pump of the secondary coupled loop heat pipe realizes the heating mode; when the ambient temperature near the hot end 9 is maintained constant, the magnetic heat pump of the secondary coupled loop heat pipe realizes the cooling mode.

[0067] Example 3

[0068] On the basis of the above embodiment, the steam pipeline is provided with a barrier filter encapsulating n sections of magnetocaloric material areas, which are, from the cold end to the hot end, a first-level magnetocaloric material area, a second-level magnetocaloric material area, ..., an n-level magnetocaloric material area;

[0069] There are n+1 thermal switches in total, namely thermal switch 1 between the cold end and the primary magnetocaloric material zone, thermal switch 2 between the primary magnetocaloric material zone and the secondary magnetocaloric material zone, ..., and thermal switch n+1 between the nth magnetocaloric material zone and the hot end; the Curie temperatures of the magnetocaloric materials at each level match the operating temperatures of each level;

[0070] The thermal switches are one-way valves or solenoid valves. Thermal switch 1 only allows the fluid to flow from the cold end to the primary magnetocaloric material area. Thermal switch 2 only allows the fluid to flow from the primary magnetocaloric material area to the secondary magnetocaloric material area. Thermal switch n+1 only allows the fluid to flow from the nth level magnetocaloric material area to the hot end.

[0071] Its specific operation method:

[0072] Magnetization is sequentially applied from the primary magnetocaloric material to the nth level magnetocaloric material. First, the primary magnetocaloric material area is magnetized. The fluid adsorbed in the primary magnetocaloric material area absorbs the heat of the primary magnetocaloric material and evaporates. The steam quickly passes through the heat switch 2 between the primary magnetocaloric material area and the secondary magnetocaloric material area and is transferred to the secondary magnetocaloric material area. It is condensed into liquid by the secondary magnetocaloric material and adsorbed inside the secondary magnetocaloric material area. In this process, the heat released by the primary magnetocaloric material is quickly transferred to the secondary magnetocaloric material area. Thermal material, and so on, after magnetization, the heat generated by the magnetocaloric material is transferred from the first-level magnetocaloric material to the n-level magnetocaloric material step by step, and finally after the n-level magnetocaloric material area is magnetized, the fluid working medium adsorbed in the n-level magnetocaloric material area absorbs the heat of the n-level magnetocaloric material and evaporates, and the vapor quickly passes through the heat switch n+1 and is transferred to the hot end, dissipates heat to the environment and condenses into liquid, and the liquid working medium flows back to the liquid storage area along the liquid pipeline with the assistance of the liquid wick, and continuously compensates the fluid working medium to the cold end under the capillary action of the liquid wick;

[0073] Subsequently, the n-level magnetocaloric material is demagnetized to the first-level magnetocaloric material. First, the n-level magnetocaloric material is demagnetized and cooled. Driven by the temperature difference, the fluid working medium adsorbed in the n-1-level magnetocaloric material area absorbs the heat of the n-1-level magnetocaloric material and evaporates. The steam quickly passes through the heat switch n and is transferred to the n-level magnetocaloric material area. It is condensed into liquid by the n-level magnetocaloric material and adsorbed inside the n-level magnetocaloric material area. In this process, the n-1-level magnetocaloric material is cooled because the heat is taken away by the steam. By analogy, the temperature drop generated by the magnetocaloric material after demagnetization causes the heat to be transferred upward step by step. After the last-level magnetocaloric material area is demagnetized and cooled, the fluid working medium in the cold end absorbs the ambient heat driven by the temperature difference and evaporates. The steam passes through the heat switch 1 between the cold end and the first-level magnetocaloric material area and is transferred to the first-level magnetocaloric material area. It is condensed into liquid by the first-level magnetocaloric material and adsorbed inside the first-level magnetocaloric material area.

[0074] When the cold end is maintained at a constant ambient temperature, the magnetic heat pump coupled to the loop heat pipe realizes the heating mode, and the above process is repeated to achieve continuous heating; when the hot end is maintained at a constant ambient temperature, the magnetic heat pump device coupled to the loop heat pipe realizes the cooling mode, and the above process is repeated to achieve continuous cooling.

[0075] Although the embodiments of the present invention have been described, relevant technical personnel in the field can understand that various changes, modifications, substitutions and deformations of these embodiments without departing from the principles and circumstances of the purpose of the present invention should be included in the scope of protection of the claims of the present invention.

Claims

1. A magnetic heat pump coupled with a loop heat pipe, characterized in that: The loop heat pipe comprises a body, a liquid wick, a magnetocaloric material, a barrier filter, a thermal switch, a fluid, and a magnet assembly; the barrier filter encapsulates the magnetocaloric material within the body of the loop heat pipe; thermal switches are provided on both sides of the magnetocaloric material, and the fluid is filled within the evacuated loop heat pipe; the body of the loop heat pipe is provided with a liquid wick, and the magnet assembly is located outside the magnetocaloric material area; The loop heat pipe body is composed of a cold end, a steam pipeline, a hot end, a liquid pipeline and a liquid storage area in the axial direction; the liquid storage area is provided between the liquid pipeline and the cold end, thereby forming a complete loop heat pipe body; The cold end, the liquid storage area and the liquid pipeline are all provided with a liquid wick; The steam pipeline is provided with a barrier filter screen encapsulating n sections of magnetocaloric material areas, which are, from the cold end to the hot end, a first-level magnetocaloric material area, a second-level magnetocaloric material area, ..., an n-level magnetocaloric material area; The magnet group is placed outside the magnetocaloric material area at each level; The fluid working medium is filled in the vacuumed loop heat pipe, part of which is located in the liquid storage area, and part of which is adsorbed in the various levels of magnetic thermal material areas and the liquid absorbing core.

2. The magnetic heat pump coupled with a loop heat pipe according to claim 1, characterized in that: The Curie temperatures of the magnetocaloric materials at each level are matched with the working temperatures at each level.

3. The magnetic heat pump coupled with a loop heat pipe according to claim 1, characterized in that: Thermal switches are provided between each section of the magnetocaloric material area and between the cold end, the hot end and the magnetocaloric material area.

4. The magnetic heat pump coupled with a loop heat pipe according to claim 1, characterized in that: The magnetocaloric material is encapsulated inside the steam pipeline through the lower barrier filter and the upper barrier filter.

5. The magnetic heat pump coupled with a loop heat pipe according to claim 1, characterized in that: The steam pipeline, liquid pipeline and liquid storage area pipe body are made of plastic, glass non-metallic pipes, and have circular or rectangular cross-sectional shapes.

6. The magnetic heat pump coupled with a loop heat pipe according to claim 1, characterized in that: The liquid absorbing core is made of alumina foam ceramics and copper braided mesh.

7. The magnetic heat pump coupled with a loop heat pipe according to claim 1, characterized in that: The magnetocaloric material is granular Gd, Gd-based alloy, or La-Fe-Si alloy; The barrier filter is a braided wire mesh made of copper or stainless steel.

8. The magnetic heat pump coupled with a loop heat pipe according to claim 1, characterized in that: The thermal switch is a one-way valve or a solenoid valve.

9. The magnetic heat pump coupled with a loop heat pipe according to claim 1, characterized in that: Specific operation method: Magnetization is sequentially applied from the primary magnetocaloric material to the nth level magnetocaloric material. First, the primary magnetocaloric material area is magnetized. The fluid adsorbed in the primary magnetocaloric material area absorbs the heat of the primary magnetocaloric material and evaporates. The steam quickly passes through the heat switch between the primary magnetocaloric material area and the secondary magnetocaloric material area and is transferred to the secondary magnetocaloric material area. It is condensed into liquid by the secondary magnetocaloric material and adsorbed inside the secondary magnetocaloric material area. In this process, the heat released by the magnetization of the primary magnetocaloric material is quickly transferred to the secondary magnetocaloric material area. The heat generated by the magnetocaloric material after magnetization is transferred from the first-level magnetocaloric material to the n-level magnetocaloric material step by step. Finally, after the n-level magnetocaloric material area is magnetized, the fluid working medium adsorbed in the n-level magnetocaloric material area absorbs the heat of the n-level magnetocaloric material and evaporates. The vapor quickly passes through the heat switch n+1 and is transferred to the hot end, dissipates heat to the environment and condenses into liquid. The liquid working medium flows back to the liquid storage area along the liquid pipeline with the assistance of the liquid wick, and continuously compensates the fluid working medium to the cold end under the capillary action of the liquid wick. Subsequently, demagnetization is carried out from the n-level magnetocaloric material to the first-level magnetocaloric material. First, the n-level magnetocaloric material is demagnetized and cooled. Driven by the temperature difference, the fluid working medium adsorbed in the n-1-level magnetocaloric material area absorbs the heat of the n-1-level magnetocaloric material and evaporates. The steam quickly passes through the heat switch n and is transferred to the n-level magnetocaloric material area. It is condensed into liquid by the n-level magnetocaloric material and adsorbed inside the n-level magnetocaloric material area. In this process, the n-1-level magnetocaloric material is cooled because the heat is taken away by the steam. By analogy, the temperature drop generated by the magnetocaloric material after demagnetization causes the heat to be transferred upward step by step. After the last-level magnetocaloric material area is demagnetized and cooled, the fluid working medium in the cold end absorbs the ambient heat driven by the temperature difference and evaporates. The steam passes through the heat switch between the cold end and the first-level magnetocaloric material area and is transferred to the first-level magnetocaloric material area. It is condensed into liquid by the first-level magnetocaloric material and adsorbed inside the first-level magnetocaloric material area. When the cold end is maintained at a constant ambient temperature, the magnetic heat pump coupled with the loop heat pipe realizes the heating mode, and the above process is repeated to achieve continuous heating; when the hot end is maintained at a constant ambient temperature, the magnetic heat pump coupled with the loop heat pipe realizes the cooling mode, and the above process is repeated to achieve continuous cooling.

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