A room-temperature magnetocaloric refrigerator based on the piezocaloric effect

Abstract

The present invention discloses a room-temperature magnetocaloric refrigerator based on the piezocaloric effect, belonging to the technical field of refrigerators. The refrigerator includes a high-precision high-pressure electric injection pump, a magnetocaloric element, a heat exchange fluid, a cold-end heat exchanger, and a hot-end heat exchanger. Due to the phase change under the action of the high-pressure injection pump, the magnetocaloric working fluid generates pressurized heat release and pressure-relieved heat absorption phenomena. The heat exchange fluid reciprocally flows between the magnetocaloric refrigeration working fluids to transfer heat and cold. The high-precision high-pressure electric injection pump in the present invention provides pressure for the magnetocaloric refrigeration cycle, with a constant pressure output. The pressurization form is liquid pressure, which well improves the defect of uneven mechanical pressure transmission. The pressurizing oil also serves as the heat exchange fluid and directly contacts the sample, directly bringing the heat and cold driven by pressure into the hot-end and cold-end heat exchangers to complete the cycle, reducing heat loss.

Description

Technical Field

[0001] The present invention relates to the technical field of refrigerators, and particularly to a room-temperature magnetocaloric refrigerator based on the barocaloric effect. Background Art

[0002] In modern society, refrigeration technology has penetrated into various production technologies and scientific fields. However, common refrigerants used in current traditional gas compression technologies, such as chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFCs), all have varying degrees of destructive effects on the ozone layer, which does not conform to the current environmental protection, green, and energy-saving health concepts of the general environment.

[0003] In this context, the development and research of environmentally friendly refrigeration technologies have become an important research direction for refrigeration technology innovation. Currently, new solid-state research refrigeration technologies are in the R & D stage. Due to their advantage of zero global warming potential (GWP), they are considered to be one of the most likely refrigeration methods to replace traditional gas compression. Among them, the principles of solid-state refrigeration technologies can be classified as follows based on different thermal effects: magnetocaloric effect, electrocaloric effect, elastocaloric effect, and barocaloric effect. The performance of solid-state phase change refrigeration materials has a huge gap compared with liquid refrigerants, which has become one of the bottlenecks restricting the application of this technology.

[0004] The barocaloric refrigeration effect has a wider range of material selection. Recently, scientists have found that in plastic crystal materials, its maximum isothermal entropy change can reach 687 J kg -1 K -1 , which is an order of magnitude higher than traditional solid-state refrigeration materials and is close to traditional commercial liquid refrigerants. The driving conditions are easy to achieve, the materials are easily available and inexpensive, which is convenient for realizing applications. In this technology, when pressure is applied to or removed from the plastic crystal material, the material will absorb or release heat due to phase changes, and thus complete the refrigeration or heating effect by exchanging heat with the load. This process is called the barocaloric effect. The thermodynamic cycle process of the barocaloric effect is consistent with the reverse Carnot cycle. Based on the generation of materials with high isothermal entropy change under room temperature conditions, corresponding refrigeration equipment needs to be developed. Summary of the Invention

[0005] The purpose of the present invention is to provide a room-temperature magnetocaloric refrigerator based on the barocaloric effect. This refrigerator is based on the above-mentioned barocaloric effect principle. By utilizing the characteristics that the barocaloric material absorbs heat and increases in temperature when pressurized and releases heat when depressurized, in a room-temperature environment, a high-precision high-pressure injection pump is used to provide corresponding phase change pressure conditions for the material, so that cold and heat can be obtained in the system, and the heat is brought to the high-temperature heat source end by the fluid flowing through the system in a cycle, and the cold is brought to the cold-end load end to complete the entire refrigeration cycle.

[0006] To achieve the above purpose, the technical solutions adopted by the present invention are as follows:

[0007] A room-temperature magnetocaloric refrigerator based on the piezocaloric effect, comprising a high-precision high-pressure electric injection pump, a magnetocaloric element, a heat exchange fluid, a cold-end heat exchanger and a hot-end heat exchanger; wherein:

[0008] Magnetocaloric element: It is a cylindrical barrel structure with a cylindrical cavity. A solid-state refrigerant is installed in the cavity. The upper part of the side wall of the barrel structure is provided with a hot-end liquid outlet pipe and a cold-end liquid outlet pipe, the lower part of the side wall is provided with a hot-end liquid inlet pipe and a cold-end liquid inlet pipe, and an oil inlet is provided in the middle of the side wall; wherein: Pressure control valves are provided on the hot-end liquid outlet pipe, the cold-end liquid outlet pipe, the hot-end liquid inlet pipe and the cold-end liquid inlet pipe;

[0009] High-precision high-pressure electric injection pump: It is used to provide a constant pressure for the magnetocaloric element; the oil injection pipe at the upper end of the injection pump is connected to the oil inlet in the magnetocaloric element, and is used to inject pressurized oil into the cavity of the magnetocaloric element. This pressurized oil also serves as a heat exchange fluid and is in direct contact with the solid-state refrigerant;

[0010] Hot-end heat exchanger: The hot-end liquid outlet pipe of the magnetocaloric element is connected to the liquid inlet of the hot-end heat exchanger, and the liquid outlet of the hot-end heat exchanger is connected to the hot-end liquid inlet pipe of the magnetocaloric element, thus forming a heat exchange loop;

[0011] Cold-end heat exchanger: The cold-end liquid outlet pipe of the magnetocaloric element is connected to the liquid inlet of the cold-end heat exchanger, and the liquid outlet of the cold-end heat exchanger is connected to the cold-end liquid inlet pipe of the magnetocaloric element, thus forming a heat exchange loop.

[0012] The solid-state refrigerant is a carborane material, NaPF 6 , KPF 6 , NaSbF 6 or KSbF 6 , and the working temperature of the solid-state refrigerant is room temperature, and the applied driving pressure is 0.1 MPa to 400 MPa. The heat exchange fluid is anti-wear hydraulic oil.

[0013] The magnetocaloric element is made of high-pressure-resistant stainless steel. The bottom of its barrel structure is sealed, and a detachable cavity upper cover is provided at the top. The solid-state refrigerant is placed inside the cylindrical cavity; Sealing filter nets are provided in the hot-end liquid outlet pipe, the cold-end liquid outlet pipe, the hot-end liquid inlet pipe and the cold-end liquid inlet pipe of the magnetocaloric element, which can prevent the solid-state refrigerant from moving during pressurization, and at the same time can also prevent debris generated by the collision between the solid-state refrigerants from flowing away with the fluid and blocking the pipeline; A rubber ring is used for sealing between the top of the barrel structure and the cavity upper cover to prevent the pressurized oil from flowing out of the cylindrical cavity. During the operation of the system, the entire magnetocaloric element is fixedly placed on a plane.

[0014] A hydraulic pump is also provided on the hot-end liquid outlet pipe of the pressure clamping element, so that the heat exchange fluid in the pressure clamping element flows into the hot-end heat exchanger under the action of the hydraulic pump, and the heat exchange fluid in the hot-end heat exchanger is pushed into the pressure clamping element, and this cycle process continues; A hydraulic pump is also provided on the cold-end liquid outlet pipe of the pressure clamping element, so that the heat exchange fluid in the pressure clamping element flows into the cold-end heat exchanger under the action of the hydraulic pump, and the heat exchange fluid in the cold-end heat exchanger is pushed into the pressure clamping element, and this cycle process continues.

[0015] The cold-end heat exchanger includes a cubic cavity I and heat exchange pipeline I inside the cavity I. The heat exchange pipeline I is arranged in a U shape and is respectively connected to the liquid inlet and outlet of the cold-end heat exchanger; Several flat interlayers are provided in the cavity I (items to be refrigerated can be placed on the flat interlayers), and the heat exchange pipeline I is arranged in the flat interlayers; A temperature sensor is installed at the top of the cubic cavity I for real-time feedback of the temperature inside the cavity I to the control system.

[0016] The hot-end heat exchanger includes a cubic cavity II and heat exchange pipeline II inside the cavity II. The heat exchange pipeline II is arranged in a spiral shape and is respectively connected to the liquid inlet and outlet of the hot-end heat exchanger; The outer shell of the cavity II is designed to be a hollow structure to facilitate internal heat exchange, and a fan is placed at the top of the cavity II to facilitate the hot-end heat exchanger to complete heat exchange with the air; A temperature sensor is installed at the top of the cavity II for real-time feedback of the temperature of the cavity II to the control system.

[0017] The electric control cabinet includes a PLC control module (control system), and the pressure control valve and the temperature sensor are electrically connected to the PLC control module; The electric control cabinet is used to control the opening, closing and flow regulation of the pressure control valve, and can simultaneously monitor the temperature information of the heat exchange fluid inside the pressure clamping element transmitted by the temperature sensor.

[0018] The advantages of the present invention are as follows:

[0019] 1. In the refrigerating machine of the present invention, due to the phase change under the action of the high-pressure injection pump, the pressure clamping working medium generates pressurized heat release and pressure relief heat absorption phenomena, and the heat exchange fluid reciprocally flows between the pressure clamping refrigerating working media to exchange heat and cold.

[0020] 2. The high-precision high-pressure electric injection pump in the present invention provides pressure for the pressure clamping refrigeration cycle, and the pressure is output constantly. The pressurization form is liquid pressure, which well improves the defect of uneven mechanical pressure transmission. The pressurization oil is simultaneously used as the heat exchange fluid and is in direct contact with the refrigerating working medium, directly bringing the heat and cold driven by the pressure into the hot-end and cold-end heat exchangers to complete the cycle, reducing heat loss.

[0021] 3. The refrigerator of the present invention, in combination with an electric control cabinet, a pressure control valve, and a temperature sensor, endows the piezocaloric refrigerator in the present invention with advantages such as intelligent regulation and convenient operation. When the heat exchange fluid in the refrigerator circulates in the pipeline under pressure drive, the temperature sensor and the pressure control valve transmit corresponding signals to the electric control cabinet, realizing real-time monitoring of temperature and pressure, and being able to control the valve to open and close according to the set program. Through a high-precision high-pressure electric injection pump, the piezocaloric material (refrigerant) inside the piezocaloric element is pressurized and depressurized, thereby generating the piezothermal effect and realizing the refrigeration cycle process. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the piezocaloric refrigerator based on the piezothermal effect of the present invention.

[0023] Figure 2 It is a schematic diagram of the structure of the high-precision high-pressure electric injection pump in the piezocaloric refrigerator of the present invention.

[0024] Figure 3 It is a schematic diagram of the structure of the piezocaloric element in the piezocaloric refrigerator of the present invention.

[0025] Figure 4 It is a schematic diagram of the structure of the cold-end heat exchanger in the piezocaloric refrigerator of the present invention.

[0026] Figure 5 It is a schematic diagram of the structure of the hot-end heat exchanger in the piezocaloric refrigerator of the present invention.

[0027] Figure 6 It is a schematic diagram of the structure of the electric control cabinet in the piezocaloric refrigerator of the present invention.

[0028] In the figure: 1 - high-precision high-pressure electric injection pump; 11 - oil injection pipe; 2 - piezocaloric element; 21 - upper cover of the cavity; 22 - cylindrical cavity; 23 - cold-end liquid outlet pipe; 24 - cold-end liquid inlet pipe; 25 - oil inlet; 26 - hot-end liquid inlet pipe; 27 - hot-end liquid outlet pipe; 3 - cold-end heat exchanger; 31 - cold-end heat exchanger liquid outlet; 32 - heat exchange pipeline I; 33 - cold-end heat exchanger liquid inlet; 34 - cubic cavity I; 4 - hot-end heat exchanger; 41 - cavity II; 42 - heat exchange pipeline II; 43 - fan; 5 - electric control cabinet; 6 - pressure control valve; 7 - temperature sensor. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] To further understand the present invention, the following describes the present invention in combination with examples. However, the examples are only for further elaborating the features and advantages of the present invention, rather than limiting the claims of the present invention.

[0030] The present invention provides a room-temperature piezocaloric refrigerator based on the piezothermal effect, as Figure 1As shown in the figure. The press - caloric refrigerator includes a high - precision high - pressure electric injection pump 1, a press - caloric element 2, a heat - exchange fluid, a cold - end heat exchanger 3, and a hot - end heat exchanger 4; the specific structures of each part are as follows:

[0031] As Figure 2 shown in the figure, the high - precision high - pressure electric injection pump (Beijing Yijie Material Technology Co., Ltd., HP350A) is used to provide a constant pressure for the press - caloric element 2; the injection oil pipe 11 at the upper end of the high - precision high - pressure electric injection pump 1 is connected to the oil inlet 25 in the press - caloric element, and is used to inject pressurized oil into the cavity of the press - caloric element;

[0032] As Figure 3 shown in the figure, the press - caloric element is a cylindrical - cavity - shaped cylinder structure 22. The cavity is filled with a solid - state refrigeration working medium. The upper part of the side wall of the cylinder structure is provided with a hot - end liquid outlet pipe 27 and a cold - end liquid outlet pipe 23. The lower part of the side wall of the cylinder structure is provided with a hot - end liquid inlet pipe 26 and a cold - end liquid inlet pipe 24. The middle part of the side wall is provided with an oil inlet 25. The pressurized oil injected from the oil inlet simultaneously serves as the heat - exchange fluid and directly contacts the solid - state refrigeration working medium. Pressure control valves 6 are provided on the hot - end liquid outlet pipe, cold - end liquid outlet pipe, hot - end liquid inlet pipe, and cold - end liquid inlet pipe, respectively, for controlling the opening and closing of the fluid and adjusting the fluid flow rate; the press - caloric element is made of high - pressure - resistant stainless steel. The bottom of its cylinder structure is sealed, and the top is provided with a detachable cavity upper cover 21. A rubber ring is used for sealing between the top of the cylinder structure and the cavity upper cover 21 to prevent the pressurized oil from flowing out of the cylindrical cavity 22; Sealing filter meshes are provided in the hot - end liquid outlet pipe, cold - end liquid outlet pipe, hot - end liquid inlet pipe, and cold - end liquid inlet pipe of the press - caloric element, which can prevent the position movement of the solid - state refrigeration working medium during the pressurization process, and at the same time avoid the debris generated by the collision between the solid - state refrigeration working media from flowing away with the fluid and blocking the pipeline; During the operation of the system, the entire press - caloric element is fixedly placed on a horizontal plane. A hydraulic pump is provided on the hot - end liquid outlet pipe of the press - caloric element, so that the heat - exchange fluid in the press - caloric element flows into the hot - end heat exchanger under the action of the hydraulic pump, and the heat - exchange fluid in the hot - end heat exchanger is pushed into the press - caloric element, and this cycle process continues; A hydraulic pump is provided on the cold - end liquid outlet pipe of the press - caloric element, so that the heat - exchange fluid in the press - caloric element flows into the cold - end heat exchanger under the action of the hydraulic pump, and the heat - exchange fluid in the cold - end heat exchanger is pushed into the press - caloric element, and this cycle process continues.

[0033] As Figure 4As shown in the figure, the cold-end heat exchanger 3 includes a cubic cavity I 34 and a heat exchange pipeline I 32 inside the cavity I. The heat exchange pipeline I 32 is arranged in a U shape. The heat exchange pipeline I is respectively connected to the cold-end liquid inlet 33 and the cold-end liquid outlet 31 of the cold-end heat exchanger. The cold-end liquid inlet 33 and the cold-end liquid outlet 31 of the cold-end heat exchanger are respectively communicated with the cold-end liquid outlet pipe and the cold-end liquid inlet pipe of the clamping element, thus forming a heat exchange loop. Several flat interlayers are provided inside the cavity I (articles to be refrigerated can be placed on the flat interlayers), and the heat exchange pipeline I is arranged inside the flat interlayers; a temperature sensor 7 is installed at the top of the cubic cavity I, which is used to feedback the temperature inside the cavity I to the control system in real time.

[0034] As Figure 5 shown in the figure, the hot-end heat exchanger 4 includes a cubic cavity II 41 and a heat exchange pipeline II 42 inside the cavity II. The heat exchange pipeline II is arranged in a spiral shape. The heat exchange pipeline II is respectively connected to the liquid inlet and the liquid outlet of the hot-end heat exchanger. The liquid inlet and the liquid outlet are respectively connected to the hot-end liquid outlet pipe and the hot-end liquid inlet pipe of the clamping element, thus forming a heat exchange loop; the outer shell of the cavity II is designed as a hollow structure to facilitate internal heat exchange, and a fan 43 is arranged at the top of the cavity II to facilitate the hot-end heat exchanger to complete heat exchange with the air; a temperature sensor is installed at the top of the cavity II, which is used to feedback the temperature of the cavity II to the control system in real time.

[0035] The room-temperature magnetocaloric refrigerator of the present invention further includes an electric control cabinet 5. The electric control cabinet includes a PLC control module (control system), and the pressure control valve 6 and the temperature sensor 7 are electrically connected to the PLC control module; the electric control cabinet is used to control the opening, closing and flow regulation of the pressure control valve, and can simultaneously monitor the temperature information of the heat exchange fluid inside the clamping element transmitted by the temperature sensor in real time.

[0036] In the present invention, the solid-state refrigeration working medium adopts a material that can achieve a refrigeration effect based on the magnetocaloric effect under normal temperature conditions. Preferably, it is a carborane material, NaPF 6 , KPF 6 , NaSbF 6 or KSbF 6 . The working temperature is room temperature, and the applied driving pressure is 0.1 MPa to 400 MPa; the heat exchange fluid used is anti-wear hydraulic oil.

[0037] The working process of the magnetocaloric refrigerator of the present invention is as follows:

[0038] According to the driving pressure and refrigeration range of the solid-state refrigeration working medium used under normal temperature conditions, the driving pressure value of the high-precision high-pressure electric injection pump 1 is set. The oil injection pipe 11 on the upper part of the high-precision high-pressure electric injection pump 1 pumps the normal-temperature heat exchange fluid into the oil inlet 25 of the clamping element, the cold-end heat exchanger 3 and the hot-end heat exchanger 4 until all the refrigeration working media inside the clamping element are covered by the heat exchange fluid.

[0039] When starting the cycle, first close the pressure control valve between the pressure clamping element 2, the cold-end heat exchanger 3 and the hot-end heat exchanger 4. Use a high-pressure precision injection pump to pressurize the refrigerant in the pressure clamping element 2 until it reaches the phase change pressure. At this time, the phase change material in the pressure clamping material has a temperature rise during the phase change. At this time, the heat exchange fluid in the pressure clamping element 2 exchanges heat with the refrigerant, and the temperature rises. After waiting for the heat exchange to complete and the temperature of the fluid in the entire cavity rises to a constant value, open the pressure control valve 6 between the pressure clamping element 2 and the hot-end heat exchanger 4, and then open the liquid pump connected between the pressure clamping element 2 and the hot-end heat exchanger 4, so that the high-temperature fluid in the pressure clamping element 2 flows into the hot-end heat exchanger 4 under the action of the pump, and exchanges heat with the external environment under the action of the top fan, while the normal-temperature fluid in the hot-end heat exchanger 4 is pushed into the pressure clamping element 2. Continue this cycle process until the temperatures of the fluids in the two cavities are the same and return to room temperature.

[0040] At this time, close the pressure control valve between the pressure clamping element 2 and the hot-end heat exchanger 4. Use the high-precision high-pressure electric injection pump 1 to reduce the pressure in the pressure clamping element 2 to atmospheric pressure. At this time, the pressure clamping material absorbs heat and the temperature drops after depressurization. After the heat exchange is completed and the temperature of the fluid in the entire cavity drops to a constant value, open the pressure control valve connected between the pressure clamping element 2 and the cold-end heat exchanger, and open the liquid pump connected between the pressure clamping element 2 and the cold-end heat exchanger 3, so that the low-temperature fluid in the pressure clamping element 2 flows into the cold-end heat exchanger 3 under the action of the pump, and transfers the cold quantity to the load (the items placed on the flat sandwich), while the normal-temperature fluid in the cold-end heat exchanger 3 flows into the pressure clamping element 2. Such a cycle continues until the temperatures at both ends return to the ambient temperature. The heat exchange cycles at the left and right ends run continuously and alternately, and the temperature of the cold-end load can be continuously decreased until the expected cooling temperature is reached.

Claims

1. A room temperature compression card refrigerator based on the pressure-caloric effect, Features: The card pressing refrigerator comprises a high-precision high-pressure electric injection pump, a card pressing element, a heat exchange fluid, a cold end heat exchanger and a hot end heat exchanger; wherein: The pressing element is a cylinder structure with a cylindrical cavity, in which a solid refrigerant is installed. A hot end liquid outlet pipe and a cold end liquid outlet pipe are arranged on the upper part of the side wall of the cylinder structure, a hot end liquid inlet pipe and a cold end liquid inlet pipe are arranged on the lower part of the side wall, and an oil inlet is arranged in the middle of the side wall; wherein: a pressure control valve is arranged on the hot end liquid outlet pipe, the cold end liquid outlet pipe, the hot end liquid inlet pipe and the cold end liquid inlet pipe; High-precision high-pressure electric injection pump: used to provide constant pressure for the card pressing element; the oil injection pipe at the upper end of the injection pump is connected to the oil inlet in the card pressing element, and is used to inject pressurized oil into the cavity of the card pressing element. The pressurized oil also serves as a heat exchange fluid and is in direct contact with the solid refrigerant; Hot end heat exchanger: The hot end liquid outlet pipe of the pressing element is connected to the liquid inlet of the hot end heat exchanger, and the liquid outlet of the hot end heat exchanger is connected to the hot end liquid inlet pipe of the pressing element, thereby forming a heat exchange circuit; Cold end heat exchanger: The cold end liquid outlet pipe of the pressing element is connected to the liquid inlet of the cold end heat exchanger, and the liquid outlet of the cold end heat exchanger is connected to the cold end liquid inlet pipe of the pressing element, thereby forming a heat exchange circuit; The solid-state refrigeration working medium is a carborane material, NaPF 6 , KPF 6 , NaSbF 6 or KSbF 6 . The working temperature of the solid-state refrigeration working medium is room temperature, and the applied driving pressure is 0.1 MPa to 400 MPa.

2. The room temperature compression card refrigerator based on the pressure-caloric effect according to claim 1, Features: The pressing element is made of high-pressure resistant stainless steel, the bottom of its cylinder structure is sealed, and a detachable cavity cover is provided on the top, and the solid refrigerant is placed inside the cylindrical cavity; the hot end liquid outlet pipe, the cold end liquid outlet pipe, the hot end liquid inlet pipe and the cold end liquid inlet pipe of the pressing element are all provided with sealed filters to prevent the solid refrigerant from moving during the pressurization process, and at the same time, to prevent the debris generated by the collision between the solid refrigerants from flowing away with the fluid and clogging the pipeline; a rubber ring is used to seal between the top of the cylinder structure and the cavity cover to prevent the pressurized oil from flowing out of the cylindrical cavity. During the operation of the system, the entire pressing element is fixedly placed on a plane.

3. The room temperature compression card refrigerator based on the pressure-caloric effect according to claim 1, Features: A hydraulic pump is provided on the hot-end liquid outlet pipe of the pressing element, so that the heat exchange fluid in the pressing element flows into the hot-end heat exchanger under the action of the hydraulic pump, and the heat exchange fluid in the hot-end heat exchanger is pushed into the pressing element, and this circulation process continues; a hydraulic pump is provided on the cold-end liquid outlet pipe of the pressing element, so that the heat exchange fluid in the pressing element flows into the cold-end heat exchanger under the action of the hydraulic pump, and the heat exchange fluid in the cold-end heat exchanger is pushed into the pressing element, and this circulation process continues.

4. The room temperature compression card refrigerator based on the pressure-caloric effect according to claim 1, Features: The cold-end heat exchanger includes a cubic cavity I and a heat exchange pipeline I inside the cavity I. The heat exchange pipeline I is arranged in a U shape and is respectively connected to the liquid inlet and the liquid outlet of the cold-end heat exchanger. A number of flat interlayers are provided inside the cavity I, and the heat exchange pipeline I is arranged inside the flat interlayers. A temperature sensor is installed at the top of the cubic cavity I for real-time feedback of the temperature inside the cavity I to the control system.

5. The room-temperature magnetocaloric refrigerator based on the barocaloric effect according to claim 1, characterized in that: the hot-end heat exchanger includes a cubic cavity II and a heat exchange pipeline II inside the cavity II. The heat exchange pipeline II is arranged in a spiral shape and is respectively connected to the liquid inlet and the liquid outlet of the hot-end heat exchanger. The outer shell of the cavity II is designed as a hollow structure to facilitate internal heat exchange, and a fan is arranged at the top of the cavity II to facilitate the hot-end heat exchanger to complete heat exchange with the air; a temperature sensor is installed at the top of the cavity II for real-time feedback of the temperature of the cavity II to the control system.

6. The room-temperature magnetocaloric refrigerator based on the barocaloric effect according to claim 1, characterized in that: it further includes an electric control cabinet. The electric control cabinet includes a PLC control module (control system), and the pressure control valve and the temperature sensor are electrically connected to the PLC control module. The electric control cabinet is used to control the opening, closing and flow regulation of the pressure control valve, and can simultaneously monitor the temperature information of the heat exchange fluid inside the magnetocaloric element transmitted by the temperature sensor.

7. The room-temperature magnetocaloric refrigerator based on the barocaloric effect according to claim 1, characterized in that: the heat exchange fluid is anti-wear hydraulic oil.

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