Magnetic regenerator module hot end heat dissipation device, test system and control method

Abstract

The present invention provides a hot-end heat dissipation device, a testing system, and a control method for a magnetic regenerator module. In the hot-end heat dissipation device, the inlets of a first fluid passage and a second fluid passage are both connected to the third end of a valve structure, the outlets of the first fluid passage and the second fluid passage are both connected to the inlet of a first pump, and the outlet of the first pump is connected to the first end of the valve structure. The on-off states at the end positions of the first and second fluid passages are independently controlled. The valve structure can be controlled to switch between the following states: State 1: Within the valve structure, the first end is connected to the second end, the third end is connected to the fourth end, and the remaining port combinations are disconnected; State 2: Within the valve structure, the first end is connected to the fourth end, the second end is connected to the third end, and the remaining port combinations are disconnected; State 3: Within the valve structure, the first end is connected to the third end, and the second end is disconnected from the fourth end.

Description

Technical Field

[0001] The present invention relates to the technical field of magnetic refrigeration, and in particular to a hot-end heat dissipation device, a testing system and a control method for a magnetic regenerator module. Background Art

[0002] This section is intended to provide a background or context to the embodiments recited in the claims. No admission is made that anything herein is prior art by virtue of its inclusion in this section.

[0003] Magnetic refrigeration is a solid-state refrigeration technology and is expected to replace traditional gas compression refrigeration technology.

[0004] Traditional magnetic refrigerators use an active magnetic regenerator with its hot end connected to a heat sink for natural or forced convection cooling. This single hot end cooling mode and the inability to precisely control the hot end temperature make it difficult to meet diverse testing requirements. Summary of the Invention

[0005] The present invention provides a magnetic regenerator module hot end heat dissipation device, a testing system and a control method.

[0006] The present invention adopts the following technical solution: a hot end heat dissipation device for a magnetic regenerator module in a magnetic refrigerator, the magnetic refrigerator comprising a first magnetic regenerator module and a second magnetic regenerator module arranged in pairs, the hot end heat dissipation device comprising: a valve structure, a first fluid passage, a second fluid passage, and a first pump;

[0007] The valve structure includes a first end, a second end, a third end, and a fourth end. The first fluid passage and the second fluid passage each have an inlet and an outlet. The first fluid passage and the second fluid passage are used for heat dissipation and have different heat dissipation modes.

[0008] The inlets of the first fluid passage and the second fluid passage are both connected to the third end of the valve structure, the outlets of the first fluid passage and the second fluid passage are both connected to the inlet of the first pump, the outlet of the first pump is connected to the first end of the valve structure, the second end of the valve structure is used to connect to the hot end of the first magnetic regenerator module, and the fourth end of the valve structure is used to connect to the hot end of the second magnetic regenerator module;

[0009] The on / off states at the end positions of the first fluid passage and the second fluid passage are independently controlled;

[0010] The valve structure can be controlled to switch between the following states:

[0011] State 1: inside the valve structure, the first end is connected to the second end, the third end is connected to the fourth end, and the remaining port combinations are disconnected;

[0012] State 2: inside the valve structure, the first end is connected to the fourth end, the second end is connected to the third end, and the remaining port combinations are disconnected;

[0013] State 3: inside the valve structure, the first end is connected to the third end, and the second end is disconnected from the fourth end.

[0014] Optionally, the valve structure includes: a first electrically controlled valve, a second electrically controlled valve, a third electrically controlled valve and a fourth electrically controlled valve;

[0015] The first ends of the first electrically controlled valve and the third electrically controlled valve are connected to each other, and are connected to the first end of the valve structure; the second end of the first electrically controlled valve and the first end of the second electrically controlled valve are connected to each other, and are connected to the second end of the valve structure; the second end of the second electrically controlled valve and the second end of the fourth electrically controlled valve are connected to each other, and are connected to the third end of the valve structure; the second end of the third electrically controlled valve and the first end of the fourth electrically controlled valve are connected to each other, and are connected to the fourth end of the valve structure.

[0016] Optionally, the first fluid path includes: a sixth electrically controlled valve, a forced thermostatic device and an eighth electrically controlled valve;

[0017] The forced constant temperature device has an inlet and an outlet;

[0018] Two ends of the sixth electrically controlled valve are respectively connected to the third end of the valve structure and the inlet of the forced thermostat, and two ends of the eighth electrically controlled valve are respectively connected to the outlet of the forced thermostat and the inlet of the first pump.

[0019] Optionally, the second fluid path includes: a fifth electrically controlled valve, a radiator and a seventh electrically controlled valve;

[0020] Two ends of the fifth electrically controlled valve are respectively connected to the third end of the valve structure and the first end of the radiator, and two ends of the seventh electrically controlled valve are respectively connected to the second end of the radiator and the inlet of the first pump.

[0021] Optionally, the first fluid path includes: a sixth electrically controlled valve, a forced thermostatic device, an eighth electrically controlled valve and a liquid storage tank;

[0022] The forced constant temperature device has a second pump, a first inlet, a second inlet and an outlet, and the liquid storage tank has an inlet, a first outlet and a second outlet;

[0023] The two ends of the sixth electrically controlled valve are respectively connected to the third end of the valve structure and the first inlet of the forced thermostat, and the two ends of the eighth electrically controlled valve are respectively connected to the outlet of the forced thermostat and the inlet of the liquid storage tank. The first outlet of the liquid storage tank is connected to the second inlet of the forced thermostat, and the second outlet of the liquid storage tank is connected to the inlet of the first pump. The second pump is used to pump the heat exchange fluid in the liquid storage tank into the forced thermostat.

[0024] Optionally, the second fluid path includes: a fifth electrically controlled valve, a radiator, a seventh electrically controlled valve and the liquid storage tank;

[0025] Two ends of the fifth electrically controlled valve are respectively connected to the third end of the valve structure and the first end of the radiator, and two ends of the seventh electrically controlled valve are respectively connected to the second end of the radiator and the inlet of the liquid storage tank.

[0026] The present invention adopts the following technical solution: a testing system for a magnetic refrigerator, including a magnetic refrigerator and the aforementioned hot end heat dissipation device, the magnetic refrigerator including a first magnetic regenerator module and a second magnetic regenerator module arranged in pairs, the second end of the valve structure being connected to the hot end of the first magnetic regenerator module, and the fourth end of the valve structure being connected to the hot end of the second magnetic regenerator module.

[0027] Optionally, the test system further includes a load, two ends of which are connected to the cold ends of the first magnetic regenerator module and the second magnetic regenerator module respectively.

[0028] Optionally, the testing system further includes:

[0029] a first temperature sensor, configured to detect the temperature of the heat exchange fluid at the hot end of the first magnetic regenerator module;

[0030] a second temperature sensor, configured to detect the temperature of the heat exchange fluid at the hot end of the second magnetic regenerator module;

[0031] a third temperature sensor, configured to detect the temperature of the heat exchange fluid at the cold end of the first magnetic regenerator module;

[0032] The fourth temperature sensor is used to detect the temperature of the heat exchange fluid at the cold end of the second magnetic regenerator module.

[0033] Optionally, the test system further includes a fifth temperature sensor for detecting the temperature of the heat exchange fluid at the load.

[0034] The present invention adopts the following technical solution: a control method applied to the aforementioned test system, comprising a first stage, a second stage, a third stage and a fourth stage of cyclic execution:

[0035] In the first stage, the first magnetic regenerator module and the second magnetic regenerator module are in a transition state, and the valve structure is controlled to be in state 3;

[0036] In the second stage, the first magnetic regenerator module is in a cold blowing state, the second magnetic regenerator module is in a hot blowing state, and the valve structure is controlled to be in state 1;

[0037] In the third stage, the first magnetic regenerator module and the second magnetic regenerator module are in a transition state, and the valve structure is controlled to be in state 3;

[0038] In the fourth stage, the first magnetic regenerator module is in a hot blowing state, the second magnetic regenerator module is in a cold blowing state, and the valve structure is controlled to be in state 2;

[0039] In the first stage, the second stage, the third stage and the fourth stage, the first fluid passage is connected to the first pump and the third end of the valve structure, and the second fluid passage is disconnected from the first pump and the third end of the valve structure. Alternatively, the first fluid passage is disconnected from the first pump and the third end of the valve structure, and the second fluid passage is connected to the first pump and the third end of the valve structure.

[0040] Optionally, in the first stage, the first electrically controlled valve and the second electrically controlled valve are controlled to be connected, and the third electrically controlled valve and the fourth electrically controlled valve are closed; or, the third electrically controlled valve and the fourth electrically controlled valve are controlled to be connected, and the first electrically controlled valve and the second electrically controlled valve are closed;

[0041] In the second stage, the first electrically controlled valve and the fourth electrically controlled valve are controlled to be turned on, and the second electrically controlled valve and the third electrically controlled valve are controlled to be turned off;

[0042] In the third stage, the first electrically controlled valve and the second electrically controlled valve are controlled to be connected, and the third electrically controlled valve and the fourth electrically controlled valve are closed, or the third electrically controlled valve and the fourth electrically controlled valve are controlled to be connected, and the first electrically controlled valve and the second electrically controlled valve are closed;

[0043] In the fourth stage, the second electrically controlled valve and the third electrically controlled valve are controlled to be connected, and the first electrically controlled valve and the fourth electrically controlled valve are controlled to be closed.

[0044] The hot-end heat sink of the present invention can operate in different heat dissipation modes, enabling various performance parameter tests of magnetic refrigerators. The flow direction of the heat exchange fluid in the first and second fluid pathways is fixed overall, allowing for greater flexibility in the design of the heat dissipation structures within the first and second fluid pathways. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 It is a structural diagram of a magnetic refrigerator and a hot end heat dissipation device thereof according to an embodiment of the present invention.

[0046] Figure 2 It is a structural diagram of a magnetic refrigerator and a hot end heat dissipation device thereof according to another embodiment of the present invention.

[0047] Figure 3a This is a graph showing the change of the magnetic field in the magnetic regenerator module of the magnetic refrigerator over time according to an embodiment of the present invention.

[0048] Figure 3b 3 is a working mode diagram of two magnetic regenerator modules of a magnetic refrigerator according to an embodiment of the present invention.

[0049] Figure 4a This is a graph showing the change in the hot-end heat exchange fluid temperature and the cold-end heat exchange fluid temperature over time of a magnetic regenerator module of a magnetic refrigerator according to an embodiment of the present invention, wherein the hot-end heat dissipation device operates in a constant temperature mode.

[0050] Figure 4b This is a graph showing the change in the hot-end heat exchange fluid temperature and the cold-end heat exchange fluid temperature over time of a magnetic regenerator module of a magnetic refrigerator according to an embodiment of the present invention, wherein the hot-end heat dissipation device operates in the radiator mode.

[0051] The figures are marked as follows: T1 to T5, the first to fifth temperature sensors; C1, the first magnetic field system; C2, the second magnetic field system; H1, the first magnetic regenerator module; H2, the second magnetic regenerator module; DF1 to DF8, the first to eighth electrically controlled valves; P, the first pump; HWSC, the constant temperature water tank; F, the load; 1, the valve structure; 11 to 14, the first end to the fourth end of the valve structure; CYG, the liquid storage tank. DETAILED DESCRIPTION

[0052] The present invention will be further described below with reference to specific embodiments, but the protection scope of the present invention is not limited thereto.

[0053] Figure 1 It is a structural diagram of a magnetic refrigerator and a hot end heat dissipation device thereof according to an embodiment of the present invention. Figure 2 It is a structural diagram of a magnetic refrigerator and a hot end heat dissipation device thereof according to another embodiment of the present invention. Figure 3a This is a graph showing the change of the magnetic field in the magnetic regenerator module of the magnetic refrigerator over time according to an embodiment of the present invention. Figure 3b 3 is a working mode diagram of two magnetic regenerator modules of a magnetic refrigerator according to an embodiment of the present invention. Figure 4a This is a graph showing the change in the hot-end heat exchange fluid temperature and the cold-end heat exchange fluid temperature over time of a magnetic regenerator module of a magnetic refrigerator according to an embodiment of the present invention, wherein the hot-end heat dissipation device operates in a constant temperature mode. Figure 4bThis is a graph showing the change in the hot-end heat exchange fluid temperature and the cold-end heat exchange fluid temperature over time of a magnetic regenerator module of a magnetic refrigerator according to an embodiment of the present invention, wherein the hot-end heat dissipation device operates in the radiator mode.

[0054] The heat exchange fluid in the embodiment of the present invention is water, but the present invention does not limit the selection of the heat exchange fluid.

[0055] Figure 1 , a first magnetic regenerator module H1, a second magnetic regenerator module H2, a first magnetic field system C1, a second magnetic field system C2, first to fifth temperature sensors T1 to T5, and a load F driven by the magnetic refrigerator are shown in the magnetic refrigerator.

[0056] The first magnetic regenerator module H1 may include, for example, one active magnetic regenerator, or multiple active magnetic regenerators connected in parallel, or multiple active magnetic regenerators connected in series.

[0057] The second magnetic regenerator module H2 may include, for example, one active magnetic regenerator, or multiple active magnetic regenerators connected in parallel, or multiple active magnetic regenerators connected in series.

[0058] The first magnetic field system C1 and the second magnetic field system C2 are used to provide magnetic fields for the first magnetic regenerator module H1 and the second magnetic regenerator module H2 respectively.

[0059] The first temperature sensor T1 is disposed at the hot end of the first magnetic regenerator module H1 and is used to detect the temperature of the heat exchange fluid at the hot end of the first magnetic regenerator module H1.

[0060] The third temperature sensor T3 is disposed at the cold end of the first magnetic regenerator module H1 and is used to detect the temperature of the heat exchange fluid at the cold end of the first magnetic regenerator module H1.

[0061] The second temperature sensor T2 is provided at the hot end of the second magnetic regenerator module H2 and is used to detect the temperature of the heat exchange fluid at the hot end of the second magnetic regenerator module H2.

[0062] The fourth temperature sensor T4 is provided at the cold end of the second magnetic regenerator module H2 and is used to detect the temperature of the heat exchange fluid at the cold end of the second magnetic regenerator module H2.

[0063] The load F represents the cold-end heat exchanger and the actual cold-end load to which the cold-end heat exchanger is connected.

[0064] The fifth temperature sensor T5 is provided at the load F and is used to detect the temperature of the heat exchange fluid at the cold-end heat exchanger.

[0065] The following description uses a thermostatic water tank (HWSC) as an example of a forced thermostatic device. Since the heat exchange fluid is not limited to water, the HWSC can also be referred to as a thermostatic bath. In other embodiments, the forced thermostatic device can be a forced thermostatic heat exchange device.

[0066] refer to Figure 1 The valve structure 1 includes: a first electrically controlled valve DF1, a second electrically controlled valve DF2, a third electrically controlled valve DF3, and a fourth electrically controlled valve DF4. The first ends of the first electrically controlled valve DF1 and the third electrically controlled valve DF3 are connected, and are connected to the first end 11 of the valve structure 1. The second end of the first electrically controlled valve DF1 is connected to the first end of the second electrically controlled valve DF2, and is connected to the second end 12 of the valve structure 1. The second end 12 of the valve structure 1 is connected to the hot end of the first magnetic regenerator module H1. The second end of the second electrically controlled valve DF2 is connected to the second end of the fourth electrically controlled valve DF4, and is connected to the third end 13 of the valve structure 1. The second end of the third electrically controlled valve DF3 is connected to the first end of the fourth electrically controlled valve DF4, and is connected to the fourth end 14 of the valve structure 1. The fourth end 14 of the valve structure 1 is connected to the hot end of the second magnetic regenerator module H2.

[0067] The one-way flow path formed from the sixth electrically controlled valve DF6 through the inlet of the constant temperature water tank HWSC and then from the outlet of the HWSC to the eighth electrically controlled valve DF8 is the first fluid path.

[0068] A one-way fluid passage formed from the fifth electrically controlled valve DF5 through the radiator SRQ to the seventh electrically controlled valve DF7 is a second fluid passage.

[0069] When the sixth electrically controlled valve DF6 and the eighth electrically controlled valve DF8 are opened and the fifth electrically controlled valve DF5 and the seventh electrically controlled valve DF7 are closed, the heat exchange fluid continues to flow unidirectionally from the third end 13 of the valve structure 1 through the first fluid passage and the first pump P to the first end 11 of the valve structure 1 in sequence.

[0070] When the sixth electrically controlled valve DF6 and the eighth electrically controlled valve DF8 are closed, and the fifth electrically controlled valve DF5 and the seventh electrically controlled valve DF7 are opened, the heat exchange fluid continues to flow unidirectionally from the third end 13 of the valve structure 1 through the second fluid passage and the first pump P to the first end 11 of the valve structure 1 in sequence.

[0071] The first and second fluid pathways have different heat dissipation modes, thereby meeting different testing requirements. The heat exchange fluid maintains a unidirectional flow from the third end 13 of the valve structure 1 to the first end 11 within the heat dissipation device, which not only facilitates heat dissipation but also increases the flexibility of the design of the first and second fluid pathways.

[0072] Please refer to Figure 1 、 Figure 3a and Figure 3b, the four phases of the active magnetic regenerator cycle are described. Assume that the sixth and eighth electrically controlled valves DF6 and DF8 remain on, and the fifth and seventh electrically controlled valves DF5 and DF7 remain off.

[0073] The first stage is a transition period, during which the fluids inside the first and second magnetic regenerator modules H1 and H2 remain stationary. During this period, the first and second electrically controlled valves DF1 and DF2 are opened, allowing the hot heat exchange fluid, previously discharged from the first magnetic regenerator module H1, to rapidly flow through the constant-temperature water tank HWSC for heat exchange, maintaining a constant temperature in the piping connected to the hot end of the first magnetic regenerator module H1. Furthermore, because the piping is located close to the hot end outlet of the first magnetic regenerator module H1, the hot end of the first magnetic regenerator module H1 remains at a constant temperature.

[0074] In the first stage, the flow direction of the heat exchange fluid is from the first electrically controlled valve DF1 through the second electrically controlled valve DF2 and the sixth electrically controlled valve DF6 into the constant temperature water tank HWSC, and then from the outlet of the constant temperature water tank HWSC through the eighth electrically controlled valve DF8 and the first pump P into the first electrically controlled valve DF1.

[0075] In the first stage, the first magnetic regenerator module H1 is also connected to the first end 11 and the third end 13 of the valve structure 1, which helps stabilize the temperature of the first magnetic regenerator module H1. In other embodiments, in the first stage, the first magnetic regenerator module H1 is disconnected from the first end 11 and the third end 13 of the valve structure 1.

[0076] In the second phase, when the first magnetic regenerator module H1 is demagnetized (cold blow), the magnetic refrigerant in the first magnetic regenerator module H1 absorbs heat. The second magnetic regenerator module H2 is in the energized phase (hot blow). The first and fourth electrically controlled valves DF1 and DF4 are opened. The heat exchange fluid flows from the first electrically controlled valve DF1 into the first magnetic regenerator module H1, passes through the cold-end load F, flows through the second magnetic regenerator module H2, and then flows through the fourth and sixth electrically controlled valves DF4 and DF6 into the thermostatic water tank HWSC. From the thermostatic water tank HWSC, it flows through the eighth electrically controlled valve DF8 and the first pump P to the first electrically controlled valve DF1.

[0077] In the second stage, the hot heat exchange fluid flowing out of the second magnetic regenerator module H2 is buffered in a constant temperature water tank and then flows back to the first heat exchanger module H1 with its temperature appropriately reduced.

[0078] The third stage is the transition period, when the heat exchange fluid inside the first magnetic regenerator module H1 and the second magnetic regenerator module H2 is stationary. At this time, the third electrically controlled valve DF3 and the fourth electrically controlled valve DF4 are opened to allow the hot heat exchange fluid discharged from the second magnetic regenerator module H2 in the previous stage to quickly flow through the constant temperature water tank HWSC for heat exchange. Figure 1From this perspective, the heat exchange fluid flows counterclockwise between the fourth electrically controlled valve DF4, the sixth electrically controlled valve DF6, the thermostatic water tank HWSC, the eighth electrically controlled valve DF8, the first pump P, and the third electrically controlled valve DF3. The heat exchange fluid in the pipeline quickly cools to the desired constant temperature.

[0079] It should be noted that in the first and third stages, it is possible to open the first and second electrically controlled valves DF1 and DF2 simultaneously or to open the third and fourth electrically controlled valves DF3 and DF4 simultaneously. This can be flexibly selected according to the actual pipeline design to maximize heat dissipation.

[0080] The valve structure 1 can be arranged close to the hot end outlets of the first magnetic regenerator module H1 and the second magnetic regenerator module H2, which is more conducive to maintaining a constant temperature at the hot ends of the first magnetic regenerator module H1 and the second magnetic regenerator module H2.

[0081] For example, the length of the pipeline from the first magnetic regenerator module H1 to the first and second electrically controlled valves DF1 and DF2 can be set to be sufficiently short, for example, less than 10 cm. The first and second electrically controlled valves DF1 and DF2 should be as close to the hot end outlet of the first magnetic regenerator module H1 as possible to remove as much heat as possible from the hot end. The length of the pipeline from the second magnetic regenerator module H2 to the third and fourth electrically controlled valves DF3 and DF4 can be set to be sufficiently short, for example, less than 10 cm. The third and fourth electrically controlled valves DF3 and DF4 should be as close to the hot end outlet of the second magnetic regenerator module H2 as possible to remove as much heat as possible from the hot end.

[0082] During the third stage, the second magnetic regenerator module H2 is connected to the third end 13 and the first end 11 of the valve structure 1, which helps stabilize the temperature of the second magnetic regenerator module H2. In other embodiments, during the third stage, the second magnetic regenerator module H2 is disconnected from the third end 13 and the first end 11 of the valve structure 1.

[0083] In the fourth phase, the first magnetic regenerator module H1 is in the energized state (hot blowing, generating heat) and the second magnetic regenerator module H2 is in the demagnetized state (cold blowing, absorbing heat). The second and third electrically controlled valves DF2 and DF3 are open. The heat exchange fluid flows from the third electrically controlled valve DF3 into the second regenerator module H2, passes through the cold-end load F, flows through the first magnetic regenerator H1 module, and then flows through the second and sixth electrically controlled valves DF2 and DF6 into the thermostatic water tank HWSC. From the thermostatic water tank HWSC, it flows through the eighth electrically controlled valve DF8 and the first pump P into the third electrically controlled valve DF3, completing one cycle.

[0084] The valve structure 1 can switch between the following 3 states:

[0085] State 1: inside the valve structure, the first end is connected to the second end, the third end is connected to the fourth end, and the remaining port combinations are disconnected;

[0086] State 2: inside the valve structure, the first end is connected to the fourth end, the second end is connected to the third end, and the remaining port combinations are disconnected;

[0087] State 3: inside the valve structure, the first end is connected to the third end, and the second end is disconnected from the fourth end.

[0088] Furthermore, the valve structure may also be in state 4, where any combination of ports is disconnected inside the valve structure.

[0089] In order to achieve the above technical effects, the internal structure of the valve structure 1 is not limited to Figure 1 For example, an electrically controlled valve may be provided between any two ports of the valve structure 1 .

[0090] In the above embodiments, the inlet of the constant temperature water tank HWSC is higher than the outlet thereof.

[0091] When testing the performance of the magnetic refrigerator under the heat dissipation state of the radiator SRQ, the fifth and seventh electrically controlled valves DF5 and DF7 can be opened, while the sixth and eighth electrically controlled valves DF6 and DF8 can be closed. During the transition period, the first and third ends 11 and 13 of the valve structure 1 can be connected, or both ends of the valve structure 1 can be disconnected.

[0092] The following table shows Figure 1 The structure shown shows the opening conditions of each electronically controlled valve in three different cooling modes. Electronically controlled valves not listed are closed.

[0093] Note: Constant temperature mode refers to Figure 1 The HWSC heat sink is used for heat dissipation. Normal Mode 1 and Normal Mode 2 are used for heat dissipation by the SRQ heat sink.

[0094] refer to Figure 1 ,The following introduces the complete control process of the test system consisting of the ,magnetic refrigerator and its hot end heat dissipation device.

[0095] Before entering this control process, it is necessary to use the positioning device and area calculation to sense the AMR cycle stage of the magnetic field system.

[0096] Specifically, the positioning device can be mechanical, photoelectric, or electromagnetic induction. It is used to determine the moment of lowest magnetic field, or zero magnetic field. The magnetic field in the magnetic refrigerator's magnetic field system varies periodically, similar to a sine wave. A cycle consists of a gradual change from a low magnetic field to a high magnetic field and then to a low magnetic field. A cycle is divided into four phases: a low magnetic field phase, a rising magnetic field phase (corresponding to a transition period), a high magnetic field phase, a falling magnetic field phase (corresponding to a transition period), and a low magnetic field phase. These four phases can be referred to as four regions in terms of time. In terms of time, if the period is fixed, as the time between the low and high magnetic fields becomes shorter, the corresponding transition period becomes longer. Conversely, as the time between the low and high magnetic fields becomes longer, the corresponding transition period becomes shorter. Once the zero magnetic field moment is determined and the positions of the four regions are defined, the control system can determine which phase is currently in.

[0097] It should be noted that, as to how to determine the specific start and end times of the four stages, those skilled in the art can implement it according to various existing methods, and the present invention does not impose any limitation thereto.

[0098] Set the cooling mode, such as selecting Constant Temperature Mode, Normal Mode 1, or Normal Mode 2 from the table above. The following uses the Constant Temperature Mode as an example.

[0099] First, the transition phase is entered, the first electrically controlled valve DF1 and the second electrically controlled valve DF2 are opened, and the other valves in the valve structure 1 are closed. The valve structure 1 is in state 3.

[0100] Subsequently, when the first magnetic regenerator module H1 is in the demagnetized state, the first and fourth electrically controlled valves DF1 and DF4 are opened, and the other valves in valve structure 1 are closed. During this stage, the second magnetic regenerator module H2 is in the energized state. Valve structure 1 is in state 1.

[0101] Then, the transition phase begins again, the third electrically controlled valve DF3 and the fourth electrically controlled valve DF4 are opened, and the other valves in the valve structure 1 are closed. The valve structure 1 is in state 3.

[0102] Finally, the first magnetic regenerator module H1 is in the magnetized state, the second and third electrically controlled valves DF2 and DF3 are open, and the other valves in valve structure 1 are closed. At this stage, the second magnetic regenerator module H2 is in the demagnetized state. Valve structure 1 is in state 2.

[0103] Then proceed to the next cycle.

[0104] Figure 4a These are the test results of a refrigerator using the aforementioned heat dissipation device, operating in constant temperature mode. The heat exchange fluid temperature at the hot end of the magnetic regenerator module remained essentially constant over time, meeting all test requirements for the magnetic refrigerator.

[0105] Figure 4b This is the test result of another refrigerator using the above heat dissipation device of the present invention, and the operating mode is selected as Normal Mode 2. As the operating time increases, the temperature of both the hot end and the cold end of the magnetic regenerator module will gradually increase.

[0106] Figure 2 Yes Figure 1 Optimization of the illustrated embodiment: The first fluid path includes a sixth electrically controlled valve DF6, a constant temperature water tank HWSC, a liquid storage tank CYG, and an eighth electrically controlled valve DF8.

[0107] Figure 2 The middle arrow indicates the flow direction of the heat exchange fluid. The fluid in the first fluid path flows from the sixth electrically controlled valve DF6 to the first inlet of the thermostatic water tank HWSC, then from the outlet of the thermostatic water tank through the eighth electrically controlled valve DF8 to the inlet of the liquid storage tank CYG. A portion of the heat exchange fluid in the liquid storage tank CYG flows back from its first outlet through the second inlet of the thermostatic water tank HWSC, while a portion flows from the second outlet of the liquid storage tank CYG to the first pump P, which then flows from the first pump P to the first end 11 of the valve structure 1.

[0108] It should be noted that a second pump (not shown) needs to be provided to pump the heat exchange fluid in the liquid storage tank CYG into the constant temperature water tank HWSC.

[0109] The constant temperature water tank HWSC, the eighth electrically controlled valve DF8 and the liquid storage tank CYG form a local circulation loop, thereby accelerating the heat exchange of the heat exchange fluid and making the heat exchange fluid flowing to the valve structure 1 more constant in temperature.

[0110] Figure 2 In the illustrated embodiment, the second fluid path includes a fifth electrically controlled valve DF5, a radiator SRQ, a seventh electrically controlled valve DF7, and a fluid reservoir CYG. The fifth electrically controlled valve DF5's two ends communicate with the third end 13 of the valve structure 1 and the first end of the radiator SRQ, respectively. The seventh electrically controlled valve DF7's two ends communicate with the second end of the radiator SRQ and the inlet of the fluid reservoir CYG, respectively. The second outlet of the fluid reservoir CYG communicates with the inlet of the first pump P. When the radiator SRQ is dissipating heat, the second pump stops operating.

[0111] The various embodiments of the present invention are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on the differences from other embodiments.

[0112] The scope of protection of the present invention is not limited to the above-described embodiments. Obviously, those skilled in the art may make various modifications and variations to the present invention without departing from the scope and spirit of the present invention. If such modifications and variations fall within the scope of the claims of the present invention and their equivalents, the present invention is intended to include such modifications and variations.

Claims

1. A hot end heat dissipation device for a magnetic regenerator module in a magnetic refrigerator, characterized in that: The magnetic refrigerator includes a first magnetic regenerator module and a second magnetic regenerator module arranged in pairs, and the hot end heat dissipation device includes: a valve structure, a first fluid passage, a second fluid passage and a first pump; The valve structure includes a first end, a second end, a third end, and a fourth end. The first fluid passage and the second fluid passage each have an inlet and an outlet. The first fluid passage and the second fluid passage are used for heat dissipation and have different heat dissipation modes. The inlets of the first fluid passage and the second fluid passage are both connected to the third end of the valve structure, the outlets of the first fluid passage and the second fluid passage are both connected to the inlet of the first pump, the outlet of the first pump is connected to the first end of the valve structure, the second end of the valve structure is used to connect to the hot end of the first magnetic regenerator module, and the fourth end of the valve structure is used to connect to the hot end of the second magnetic regenerator module; The on / off states at the end positions of the first fluid passage and the second fluid passage are independently controlled; The valve structure can be controlled to switch between the following states: State 1: inside the valve structure, the first end is connected to the second end, the third end is connected to the fourth end, and the remaining port combinations are disconnected; State 2: inside the valve structure, the first end is connected to the fourth end, the second end is connected to the third end, and the remaining port combinations are disconnected; State 3: inside the valve structure, the first end is connected to the third end, and the second end is disconnected from the fourth end; The first fluid path includes: a sixth electrically controlled valve, a forced constant temperature device, an eighth electrically controlled valve and a liquid storage tank; The forced constant temperature device has a second pump, a first inlet, a second inlet and an outlet, and the liquid storage tank has an inlet, a first outlet and a second outlet; The two ends of the sixth electrically controlled valve are respectively connected to the third end of the valve structure and the first inlet of the forced thermostat, and the two ends of the eighth electrically controlled valve are respectively connected to the outlet of the forced thermostat and the inlet of the liquid storage tank. The first outlet of the liquid storage tank is connected to the second inlet of the forced thermostat, and the second outlet of the liquid storage tank is connected to the inlet of the first pump. The second pump is used to pump the heat exchange fluid in the liquid storage tank into the forced thermostat.

2. The hot end heat dissipation device according to claim 1, characterized in that: The valve structure includes: a first electrically controlled valve, a second electrically controlled valve, a third electrically controlled valve and a fourth electrically controlled valve; The first ends of the first electrically controlled valve and the third electrically controlled valve are connected to each other, and are connected to the first end of the valve structure; the second end of the first electrically controlled valve and the first end of the second electrically controlled valve are connected to each other, and are connected to the second end of the valve structure; the second end of the second electrically controlled valve and the second end of the fourth electrically controlled valve are connected to each other, and are connected to the third end of the valve structure; the second end of the third electrically controlled valve and the first end of the fourth electrically controlled valve are connected to each other, and are connected to the fourth end of the valve structure.

3. The hot end heat dissipation device according to claim 1, characterized in that: The second fluid path includes: a fifth electrically controlled valve, a radiator, a seventh electrically controlled valve and the liquid storage tank; Two ends of the fifth electrically controlled valve are respectively connected to the third end of the valve structure and the first end of the radiator, and two ends of the seventh electrically controlled valve are respectively connected to the second end of the radiator and the inlet of the liquid storage tank.

4. A magnetic refrigerator test system, characterized in that: It comprises a magnetic refrigerator and a hot end heat dissipation device according to any one of claims 1 to 3, wherein the magnetic refrigerator comprises a first magnetic regenerator module and a second magnetic regenerator module arranged in a pair, the second end of the valve structure is connected to the hot end of the first magnetic regenerator module, and the fourth end of the valve structure is connected to the hot end of the second magnetic regenerator module.

5. The test system according to claim 4, characterized in that: The test system further includes a load, two ends of which are connected to the cold ends of the first magnetic regenerator module and the second magnetic regenerator module, respectively.

6. A control method applied to the test system according to claim 4 or 5, characterized in that: Includes the first, second, third, and fourth phases of loop execution: In the first stage, the first magnetic regenerator module and the second magnetic regenerator module are in a transition state, and the valve structure is controlled to be in state 3; In the second stage, the first magnetic regenerator module is in a cold blowing state, the second magnetic regenerator module is in a hot blowing state, and the valve structure is controlled to be in state 1; In the third stage, the first magnetic regenerator module and the second magnetic regenerator module are in a transition state, and the valve structure is controlled to be in state 3; In the fourth stage, the first magnetic regenerator module is in a hot blowing state, the second magnetic regenerator module is in a cold blowing state, and the valve structure is controlled to be in state 2; In the first stage, the second stage, the third stage and the fourth stage, the first fluid passage is connected to the first pump and the third end of the valve structure, and the second fluid passage is disconnected from the first pump and the third end of the valve structure. Alternatively, the first fluid passage is disconnected from the first pump and the third end of the valve structure, and the second fluid passage is connected to the first pump and the third end of the valve structure.

7. The control method according to claim 6, characterized in that: The hot end heat dissipation device is the hot end heat dissipation device according to claim 2; In the first stage, the first electrically controlled valve and the second electrically controlled valve are controlled to be connected, and the third electrically controlled valve and the fourth electrically controlled valve are closed, or the third electrically controlled valve and the fourth electrically controlled valve are controlled to be connected, and the first electrically controlled valve and the second electrically controlled valve are closed; In the second stage, the first electrically controlled valve and the fourth electrically controlled valve are controlled to be turned on, and the second electrically controlled valve and the third electrically controlled valve are controlled to be turned off; In the third stage, the first electrically controlled valve and the second electrically controlled valve are controlled to be connected, and the third electrically controlled valve and the fourth electrically controlled valve are closed, or the third electrically controlled valve and the fourth electrically controlled valve are controlled to be connected, and the first electrically controlled valve and the second electrically controlled valve are closed; In the fourth stage, the second electrically controlled valve and the third electrically controlled valve are controlled to be connected, and the first electrically controlled valve and the fourth electrically controlled valve are controlled to be closed.

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