CN109855325B - Magnetic refrigeration system and refrigeration device - Google Patents
Magnetic refrigeration system and refrigeration device Download PDFInfo
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- CN109855325B CN109855325B CN201811311969.5A CN201811311969A CN109855325B CN 109855325 B CN109855325 B CN 109855325B CN 201811311969 A CN201811311969 A CN 201811311969A CN 109855325 B CN109855325 B CN 109855325B
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- 238000005057 refrigeration Methods 0.000 title claims abstract description 201
- 239000012530 fluid Substances 0.000 claims abstract description 95
- 230000007246 mechanism Effects 0.000 claims abstract description 29
- 239000007788 liquid Substances 0.000 claims description 44
- 238000004891 communication Methods 0.000 claims description 17
- 239000000463 material Substances 0.000 claims description 15
- 239000000126 substance Substances 0.000 claims description 11
- 230000000712 assembly Effects 0.000 claims description 10
- 238000000429 assembly Methods 0.000 claims description 10
- 238000004378 air conditioning Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 2
- 230000005347 demagnetization Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005415 magnetization Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
Abstract
The application discloses a magnetic refrigeration system and a refrigeration device, wherein the magnetic refrigeration system comprises: a fluid driving mechanism; a first heat exchange unit; a second heat exchange unit; and the magnetic refrigeration unit comprises at least two parallel magnetic refrigeration structures, the magnetic refrigeration structure comprises at least two magnetic working medium beds capable of switching magnetic states, the Curie temperature of the magnetic working medium bed of at least one magnetic refrigeration structure is different from the Curie temperature of the magnetic working medium beds of all other magnetic refrigeration structures, and the fluid driving mechanism can drive heat exchange fluid to reciprocate along the first heat exchange unit, the magnetic refrigeration unit and the second heat exchange unit. The magnetic refrigeration system can maintain good refrigeration efficiency in a wider temperature range.
Description
Technical Field
The application relates to the technical field of refrigeration equipment, in particular to a magnetic refrigeration system and a refrigeration device.
Background
Because of the adverse environmental impact of the currently prevailing vapor compression technology, people are gradually moving their line of sight to other green new refrigeration technology applications. The magnetic refrigeration technology has obvious advantages certainly due to the characteristics of environmental protection and energy conservation.
However, for a particular magnetic refrigerator, where the curie temperature of the magnetocaloric materials is relatively fixed, the fixed curie temperature makes these magnetocaloric materials capable of generating a large magnetocaloric effect only around the curie temperature, resulting in a narrow temperature range of the environment to which they are adapted in the current magnetic refrigeration system, and cannot be used in environments with large temperature variations.
Disclosure of Invention
Based on the above, aiming at the problems that the environment temperature area adapted to the magnetocaloric material is narrower and the magnetocaloric material cannot be used in the environment with larger temperature change in the traditional magnetic refrigerator, a magnetic refrigerating system and a refrigerating device are provided, wherein the magnetic refrigerating system can keep good refrigerating efficiency in a wider temperature interval and can be used in the environment with larger temperature change; the refrigerating device comprises the magnetic refrigerating system, so that the refrigerating device can maintain good refrigerating efficiency in a wide temperature range and can be used in an environment with large temperature variation.
The specific technical scheme is as follows:
in one aspect, the present application relates to a magnetic refrigeration system comprising: a fluid driving mechanism; a first heat exchange unit; a second heat exchange unit; and the magnetic refrigeration unit comprises at least two magnetic refrigeration structures which are communicated in parallel with the fluid driving mechanism, wherein the magnetic refrigeration structure comprises at least two magnetic working medium beds which can be used for switching magnetic states, at least one of the magnetic refrigeration structures is different from the magnetic working medium beds of the other magnetic refrigeration structure in Curie temperature, and the fluid driving mechanism can drive heat exchange fluid to flow back and forth along the first heat exchange unit, the magnetic refrigeration unit and the second heat exchange unit.
When the magnetic refrigeration system is used, as the magnetic refrigeration structure comprises at least two magnetic working medium beds capable of switching magnetic states, namely at least two magnetic working medium beds are respectively in a magnetizing state and a demagnetizing state, when the fluid driving mechanism drives heat exchange fluid to reciprocate along the first heat exchange unit, the magnetic refrigeration unit and the second heat exchange unit, the circulating refrigeration of the magnetic refrigeration system is realized; further, since the curie temperature of the magnetic working medium bed of at least one of the magnetic refrigeration structures is different from the curie temperature of the magnetic working medium bed of the other magnetic refrigeration structure, the magnetic refrigeration structure can maintain good refrigeration efficiency in a wider temperature interval, and can be used in an environment with larger temperature variation.
The technical scheme is further described as follows:
in one embodiment, the magnetic refrigeration system further comprises a temperature sensor, at least two control valve assemblies and a controller, wherein the temperature sensor is used for detecting the ambient temperature, one control valve assembly corresponds to one magnetic refrigeration structure, the magnetic refrigeration structure comprises two communicated openings, one opening is communicated with the first heat exchange unit, the other opening is communicated with one end of the second heat exchange unit, the control valve assembly comprises two control valves, one control valve is used for opening or closing the opening of the magnetic refrigeration structure close to the first heat exchange unit, the other control valve is used for opening or closing the opening of the magnetic refrigeration structure close to the second heat exchange unit, and all the control valve assemblies and the temperature sensor are in communication connection with the controller.
In one embodiment, the first heat exchange unit comprises a first hot-end heat exchanger, a first one-way valve and a second one-way valve, wherein the first hot-end heat exchanger is communicated with the first one-way valve in series and then is communicated with the second one-way valve in parallel, and the flow directions of the heat exchange fluid in the first one-way valve and the second one-way valve are opposite; the second heat exchange unit comprises a second hot end heat exchanger, a third one-way valve and a fourth one-way valve, wherein the second hot end heat exchanger is communicated with the third one-way valve in series and then is communicated with the fourth one-way valve in parallel, the flowing directions of heat exchange fluid in the third one-way valve and the fourth one-way valve are opposite, the flowing directions of the heat exchange fluid in the third one-way valve and the second one-way valve are the same, and the flowing directions of the heat exchange fluid in the fourth one-way valve and the first one-way valve are the same.
In one embodiment, the magnetic working fluid bed comprises at least two pieces of magnetocaloric material having different curie temperatures.
In one embodiment, the curie temperatures of all the magnetocaloric material pieces are increased or decreased at preset temperature intervals.
In one embodiment, the magnetic refrigeration unit comprises a first magnetic refrigeration structure, a second magnetic refrigeration structure and a third magnetic refrigeration structure, the first magnetic refrigeration structure, the second magnetic refrigeration structure and the third magnetic refrigeration structure are communicated with the fluid driving mechanism in parallel, the first magnetic refrigeration structure comprises two first magnetic working medium beds with opposite magnetic states, the second magnetic refrigeration structure comprises two second magnetic working medium beds with opposite magnetic states, the third magnetic refrigeration structure comprises two third magnetic working medium beds with opposite magnetic states, the curie temperature of the first magnetic working medium bed is smaller than the curie temperature of the second magnetic working medium bed, and the curie temperature of the second magnetic working medium bed is smaller than the curie temperature of the third magnetic working medium bed.
In one embodiment, the fluid driving mechanism comprises a first fluid collector and a second fluid collector, wherein the first fluid collector is communicated with one end of the first heat exchange unit, the second fluid collector is communicated with one end of the second heat exchange unit, and the phases of the first fluid collector and the second fluid collector are opposite.
In one embodiment, the first liquid collector is provided with a first piston, the second liquid collector is provided with a second piston, and the running directions of the first piston and the second piston are opposite.
In one embodiment, the number of the first heat exchange units is two, the number of the second heat exchange units is two, and the number of the magnetic refrigeration units is two, wherein one first heat exchange unit, one second heat exchange unit and one magnetic refrigeration unit are sequentially connected in series to form a refrigeration group, and the two refrigeration groups are both connected in parallel with the fluid driving mechanism.
In another aspect, the present application is directed to a refrigeration apparatus comprising a magnetic refrigeration system.
When the refrigerating device is used, as the magnetic refrigerating structure comprises at least two magnetic working medium beds capable of switching magnetic states, namely at least two magnetic working medium beds are respectively in a magnetizing state and a demagnetizing state, when the fluid driving mechanism drives heat exchange fluid to reciprocate along the first heat exchange unit, the magnetic refrigerating unit and the second heat exchange unit, the circulating refrigeration of the magnetic refrigerating system is realized; further, since the curie temperature of the magnetic working medium bed of at least one of the magnetic refrigeration structures is different from the curie temperature of the magnetic working medium bed of the other magnetic refrigeration structure, the refrigeration device can maintain good refrigeration efficiency in a wider temperature interval, and can be used in an environment with larger temperature variation.
Drawings
FIG. 1 is a schematic diagram of a magnetic refrigeration system in one embodiment;
fig. 2 is a schematic diagram of a magnetic refrigeration system in another embodiment.
Reference numerals illustrate:
10. the magnetic refrigeration system comprises 110, a first liquid collector, 112, a first piston, 120, a second liquid collector, 122, a second piston, 200, a first heat exchange unit, 210, a first hot end heat exchanger, 220, a first check valve, 230, a second check valve, 300, a second heat exchange unit, 310, a second hot end heat exchanger, 320, a third check valve, 330, a fourth check valve, 410, a first magnetic refrigeration structure, 412, a first magnetic working medium bed, 420, a first cold end heat exchanger, 510, a second magnetic refrigeration structure, 512, a second magnetic working medium bed, 520, a second cold end heat exchanger, 610, a third magnetic refrigeration structure, 612, a third magnetic working medium bed, 620, a third cold end heat exchanger, 700, a control valve, 800 and a temperature sensor.
Detailed Description
The present application will be further described in detail with reference to the drawings and the detailed description, in order to make the objects, technical solutions and advantages of the present application more apparent. It should be understood that the detailed description and specific examples are intended for purposes of illustration only and are not intended to limit the scope of the application.
It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "mounted" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.
It will be understood that when an element is referred to as being "mounted" on another element, it can be integrated or be detachably connected.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
Further, it is also to be understood that, in the present embodiment, the positional relationship indicated by the terms "lower", "upper", "front", "rear", "left", "right", "inner", "outer", "top", "bottom", "one side", "another side", "one end", "the other end", and the like are based on the positional relationship shown in the drawings; the terms "first," "second," and the like are used to distinguish between different structural components. These terms are only used to facilitate the description of the application and to simplify the description, and should not be construed as limiting the application.
As shown in fig. 1-2, a magnetic refrigeration system 10 in one embodiment includes: a fluid driving mechanism; a first heat exchange unit 200; a second heat exchange unit 300; and the magnetic refrigeration units are sequentially communicated in series, one end, away from the magnetic refrigeration unit, of the first heat exchange unit 200 is communicated with the fluid driving mechanism, one end, away from the magnetic refrigeration unit, of the second heat exchange unit 300 is communicated with the fluid driving mechanism, each magnetic refrigeration unit comprises at least two magnetic refrigeration structures which are communicated with the fluid driving mechanism in parallel, each magnetic refrigeration structure comprises at least two magnetic working medium beds capable of switching magnetic states, the Curie temperature of the magnetic working medium bed of at least one magnetic refrigeration structure is different from the Curie temperature of the magnetic working medium bed of the other magnetic refrigeration structure, and the fluid driving mechanism can drive heat exchange fluid to reciprocate back and forth along the first heat exchange unit 200, the magnetic refrigeration unit and the second heat exchange unit 300.
When the magnetic refrigeration system 10 is in use, the magnetic refrigeration structure comprises at least two magnetic working medium beds capable of switching magnetic states, namely, the at least two magnetic working medium beds are respectively in a magnetizing state and a demagnetizing state, and when the fluid driving mechanism drives heat exchange fluid to reciprocate along the first heat exchange unit 200, the magnetic refrigeration unit and the second heat exchange unit 300, the circulation refrigeration of the magnetic refrigeration system 10 is realized; further, since the curie temperature of the magnetic medium bed of at least one of the magnetic refrigeration structures is different from the curie temperature of the magnetic medium beds of all the other magnetic refrigeration structures, the magnetic refrigeration structures can maintain good refrigeration efficiency in a wider temperature interval, and can be used in an environment with larger temperature variation. In this embodiment, the magnetic refrigeration system 10 further includes at least two magnets, where one magnet corresponds to one magnetic refrigeration structure, and the magnets can switch between at least two magnetic working substance beds to add magnetism, so that the magnetic states of the at least two magnetic working substance beds are opposite. It should be noted that, in this embodiment, the magnetic states of the two magnetic substance beds are opposite to each other, and the two magnetic substance beds are in the magnetized state or the demagnetized state, respectively. It should be noted that, in this embodiment, the serial connection of the first heat exchange unit 200, the magnetic refrigeration unit, and the second heat exchange unit 300 in sequence means that the serial connection of the first heat exchange unit 200, the magnetic refrigeration unit, and the second heat exchange unit 300 in sequence through pipes, and the parallel connection of at least two magnetic refrigeration structures with the fluid driving mechanism means that two openings of each magnetic refrigeration structure are all connected with two openings of the fluid driving mechanism through pipes; the specific communication mode can be realized through a multi-way valve matched pipeline, and is not described in detail herein.
As shown in fig. 1, the magnetic refrigeration system 10 further includes a temperature sensor 800, at least two control valve assemblies and a controller, wherein the temperature sensor 800 is used for detecting an ambient temperature, one control valve assembly corresponds to one magnetic refrigeration structure, the magnetic refrigeration structure includes two communicated openings, one of the openings is communicated with the first heat exchange unit 200, the other opening is communicated with one end of the second heat exchange unit 300, the control valve assembly includes two control valves 700, one control valve 700 is used for opening or closing the opening of the magnetic refrigeration structure close to the first heat exchange unit 200, the other control valve 700 is used for opening or closing the opening of the magnetic refrigeration structure close to the second heat exchange unit 300, and all the control valve assemblies and the temperature sensor 800 are in communication connection with the controller. Therefore, as the magneto-caloric effect of the magnetic working medium beds in each magnetic refrigeration structure is different at different environmental temperatures, different magnetic refrigeration structures are divided into different temperature application areas; when the temperature sensor 800 monitors that the temperature of the environment is in the first temperature interval, the controller controls the control valve assembly corresponding to the magnetic refrigeration structure adapting to the temperature interval to be opened, and the rest control valve assemblies are closed, so that the heat exchange fluid can exchange heat on the branch, and the refrigeration efficiency of the magnetic refrigeration structure is further improved.
As shown in fig. 1, on the basis of any of the above embodiments, the first heat exchange unit 200 includes a first hot side heat exchanger 210, a first check valve 220 and a second check valve 230, where the first hot side heat exchanger 210 is connected in series with the first check valve 220 and then connected in parallel with the second check valve 230, and the flow directions of the heat exchange fluid in the first check valve 220 and the second check valve 230 are opposite; the second heat exchange unit 300 includes a second hot side heat exchanger 310, a third check valve 320 and a fourth check valve 330, where the second hot side heat exchanger 310 is connected in series with the third check valve 320 and then connected in parallel with the fourth check valve 330, and the flow directions of the heat exchange fluid in the third check valve 320 and the fourth check valve 330 are opposite, and the flow directions of the heat exchange fluid in the third check valve 320 and the second check valve 230 are the same, and the flow directions of the heat exchange fluid in the fourth check valve 330 and the first check valve 220 are the same. In this way, the heat exchange fluid can flow along the second check valve 230, the magnetic refrigeration structure, the second hot side heat exchanger 310 and the third check valve 320 to complete the first stage refrigeration, and the heat exchange fluid can flow along the fourth check valve 330, the magnetic refrigeration structure, the first hot side heat exchanger 210 and the first check valve 220 to complete the second stage refrigeration, thereby realizing the cycle refrigeration.
In accordance with any of the above embodiments, the magnetic working fluid bed comprises at least two pieces of magnetocaloric material having different curie temperatures. Thus, an effective magnetocaloric effect can be realized in a wider temperature interval in one magnetic working medium bed, so that the magnetic refrigerating system 10 can adapt to a wider temperature change interval, and the capability of the magnetic refrigerating system 10 for adapting to different temperatures is improved; on the basis of the embodiment, the curie temperatures of all the magnetocaloric material pieces are increased or decreased at preset temperature intervals. In this embodiment, the number of magnetic refrigeration structures is three, and the curie temperature of the magnetocaloric material in the magnetic working medium bed in one magnetic refrigeration structure is: 284K, 286K, 288K, 290K, 292K, 294K, the magnetic refrigeration structure can adapt to the refrigeration in a low-temperature region; the Curie temperature of the magnetocaloric material in the magnetic working medium bed in the other magnetic refrigeration structure is as follows: 296K, 298K, 300K, 302K, 304K, 306K, the magnetic refrigeration structure can adapt to the refrigeration in the medium temperature interval; the Curie temperature of the magnetocaloric material in the magnetic working medium bed in the third magnetic refrigeration structure is as follows: 308K, 310K, 312K, 314K, 316K, 318K, the magnetic refrigeration structure can adapt to refrigeration in a high temperature range.
As shown in fig. 1, on the basis of any one of the above embodiments, the magnetic refrigeration unit includes a first magnetic refrigeration structure 410, a second magnetic refrigeration structure 510 and a third magnetic refrigeration structure 610, where the first magnetic refrigeration structure 410, the second magnetic refrigeration structure 510 and the third magnetic refrigeration structure 610 are in parallel communication with the fluid driving mechanism, and the first magnetic refrigeration structure 410 includes two first magnetic working medium beds 412 with opposite magnetic states, the second magnetic refrigeration structure 510 includes two second magnetic working medium beds 512 with opposite magnetic states, the third magnetic refrigeration structure 610 includes two third magnetic working medium beds 612 with opposite magnetic states, the curie temperature of the first magnetic working medium bed 412 is less than the curie temperature of the second magnetic working medium bed 512, and the curie temperature of the second magnetic working medium bed 512 is less than the curie temperature of the third magnetic working medium bed 612. Therefore, as the magneto-caloric effect of the magnetic working medium beds in each magnetic refrigeration structure is different at different environmental temperatures, different magnetic refrigeration structures are divided into different temperature application areas; when the temperature sensor 800 monitors that the temperature of the environment is in the first temperature interval, the controller controls the control valve assembly corresponding to the magnetic refrigeration structure adapting to the temperature interval to be opened, and the rest control valve assemblies are closed, so that the heat exchange fluid can exchange heat on the branch, and the refrigeration efficiency of the magnetic refrigeration structure is further improved.
As shown in fig. 1 and 2, the fluid driving mechanism includes a first fluid collector 110 and a second fluid collector 120, the first fluid collector 110 is communicated with one end of the first heat exchanging unit 200, the second fluid collector 120 is communicated with one end of the second heat exchanging unit 300, and the phases of the first fluid collector 110 and the second fluid collector 120 are opposite. Thus, by the second liquid trap adsorbing liquid when the first liquid trap 110 extrudes liquid, the first liquid trap 110 adsorbs liquid when the second liquid trap 120 extrudes liquid, thereby achieving flow and reversing of fluid; on the basis of the embodiment, the first liquid collector 110 is provided with a first piston 112, the second liquid collector 120 is provided with a second piston 122, and the running directions of the first piston 112 and the second piston 122 are opposite. In this manner, fluid flow and reversing is achieved by the first piston 112 and the second piston 122 operating in different directions.
As shown in fig. 2, on the basis of any of the above embodiments, the number of the first heat exchange units 200 is two, the number of the second heat exchange units 300 is two, and the number of the magnetic refrigeration units is two, wherein one first heat exchange unit 200, one second heat exchange unit 300 and one magnetic refrigeration unit are sequentially connected in series to form a refrigeration group, and both refrigeration groups are connected in parallel with the fluid driving mechanism. Thus, the refrigerating efficiency is improved by arranging two groups of refrigerating groups. It is to be noted that the parallel communication referred to in this embodiment means that the two openings of the refrigeration group are correspondingly communicated with the two openings of the fluid drive mechanism through the pipes.
As shown in fig. 1, in this embodiment, the number of the magnetic refrigeration structures is three, namely, a first magnetic refrigeration structure 410, a second magnetic refrigeration structure 510 and a third magnetic refrigeration structure 610, where the first magnetic refrigeration structure 410 includes a first cold-end heat exchanger 420, the second magnetic refrigeration structure 510 includes a second cold-end heat exchanger 520, the third magnetic refrigeration structure 610 includes a third cold-end heat exchanger 620, the first magnetic refrigeration structure 410 includes two first magnetic working medium beds 412 with opposite magnetic states, the second magnetic refrigeration structure 510 includes two second magnetic working medium beds 512 with opposite magnetic states, the third magnetic refrigeration structure 610 includes two third magnetic working medium beds 612 with opposite magnetic states, one of the first magnetic working medium beds 412, the first cold-end heat exchanger 420 and the other first magnetic working medium bed 412 are sequentially connected in series through a pipeline and the other communication device, where one of the second magnetic working medium beds 512, the second cold-end heat exchanger 520 and the other second magnetic working medium bed 512 are sequentially connected in series through a pipeline and the other communication device, and where one of the third magnetic working medium beds 612, the third magnetic working medium bed 620 and the other second magnetic working medium bed 512 are sequentially connected in series through a pipeline and the other communication device; the first magnetic refrigeration structure 410 operates in a first temperature interval, the second magnetic refrigeration structure 510 operates in a second temperature interval, and the third magnetic refrigeration structure 610 operates in a third temperature interval by controlling the opening or closing of the control valve assembly; for example, when the temperature sensor 800 detects that the ambient temperature is in the first temperature range, the magnet is switched to make the first magnetic medium bed 412 close to the first heat exchange unit 200 in the demagnetized state, and the first magnetic medium bed 412 close to the second heat exchange unit 300 is in the magnetized state, at this time, the first liquid collector 110 discharges liquid, and the second liquid collector 120 collects liquid, that is, the first piston 112 pushes the space in the compressed liquid collecting cavity of the first liquid collector 110 inwards, and at the same time, the second piston 122 pulls the space in the compressed liquid collecting cavity of the second liquid collector 120 outwards, so that the first liquid collector 110 and the second liquid collector 120 act together to realize the movement of the pushing fluid. After the heat exchange fluid leaves the first liquid collector 110, the first check valve 220 blocks the fluid from flowing to the first hot-end heat exchanger 210, and the electromagnetic valve assembly arranged on the second magnetic refrigeration structure 510 is closed and the electromagnetic valve assembly of the third magnetic refrigeration structure 610 is closed, so that the second check valve 230 guides the fluid to flow to the first magnetic refrigeration structure 410, at this time, the temperature of the demagnetized first magnetic working medium bed 412 is lower, the heat of the heat exchange fluid is absorbed, the heat exchange fluid is cooled, the temperature is reduced, then the heat exchange fluid enters the first cold-end heat exchanger 420 to absorb the heat of the space to be cooled, and then enters the magnetized first magnetic working medium bed 412 to exchange heat with the magnetocaloric material in the magnetized first magnetic working medium bed 412 to absorb the heat generated by the magnetized first magnetic working medium bed 412, at this time, the heat exchange fluid only enters the second hot-end heat exchanger 310 due to the blockage of the fourth check valve 330, the heat exchange fluid exchanges heat with the external environment in the second hot-end heat exchanger 310, the heat exchange fluid releases the heat generated in the system to the external environment, and then the heat exchange fluid enters the third check valve 320 to the second liquid collector 120 to complete the first cycle; in the second stage, the magnetization and demagnetization states of the first magnetic working fluid bed 412 in the first magnetic refrigeration structure 410 are opposite to those of the first stage, that is, the first magnetic working fluid bed 412 close to the first heat exchange unit 200 is in the magnetization state, the first magnetic working fluid bed 412 close to the second heat exchange unit 300 is in the demagnetization state, at this time, the second liquid collector 120 discharges liquid, and the first liquid collector 110 collects liquid, that is, the second piston 122 pushes the space in the compression liquid collection cavity of the second liquid collector 120 inwards, and at the same time, the first piston 112 pulls outwards to expand the space in the compression liquid collection cavity of the first liquid collector 110, and the second liquid collector 120 and the first liquid collector 110 jointly act to push the fluid to move; after the heat exchange fluid leaves the second liquid collector 120, the third check valve 320 blocks the fluid from flowing to the second hot-end heat exchanger 310, and the electromagnetic valve assembly arranged on the second magnetic refrigeration structure 510 is closed and the electromagnetic valve assembly arranged on the third magnetic refrigeration structure 610 is closed, so that the fourth check valve 330 guides the fluid to flow to the first magnetic refrigeration structure 410, the temperature of the demagnetized first magnetic working medium bed 412 is lower, the heat of the heat exchange fluid is absorbed, the heat exchange fluid is cooled, the temperature is reduced, and then the heat exchange fluid enters the first cold-end heat exchanger 420 to absorb the heat of the space to be cooled, and then enters the magnetized first magnetic working medium bed 412 to exchange heat with the magnetocaloric material in the magnetized first magnetic working medium bed 412 so as to absorb the heat generated by the magnetized first magnetic working medium bed 412. At this time, the second check valve 230 is blocked, the heat exchange fluid can only enter the first hot side heat exchanger 210, the heat exchange fluid exchanges heat with the external environment in the first hot side heat exchanger 210, the heat exchange fluid releases the heat generated in the system to the external environment in the process, and then the heat exchange fluid enters the first liquid collector 110 through the first check valve 220, so as to complete the second stage of the circulation process, and further realize the refrigeration cycle; when the temperature sensor 800 monitors that the ambient temperature is in the second temperature interval and the second temperature interval, only the corresponding solenoid valve needs to be closed, and other principles are similar to those described above, and are not repeated herein.
In another aspect, the present application is directed to a refrigeration apparatus including a magnetic refrigeration system 10.
When the refrigerating device is used, the magnetic refrigerating structure comprises at least two magnetic working medium beds capable of switching magnetic states, namely, the at least two magnetic working medium beds are respectively in a magnetizing state and a demagnetizing state, and when the fluid driving mechanism drives heat exchange fluid to reciprocate along the first heat exchange unit 200, the magnetic refrigerating unit and the second heat exchange unit 300, the circulating refrigeration of the magnetic refrigerating system 10 is realized; further, since the curie temperature of the magnetic working medium bed of at least one of the magnetic refrigeration structures is different from the curie temperature of the magnetic working medium beds of all the other magnetic refrigeration structures, the refrigeration device can maintain good refrigeration efficiency in a wider temperature interval, and can be used in an environment with larger temperature variation.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The foregoing examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.
Claims (10)
1. A magnetic refrigeration system, comprising:
a fluid driving mechanism;
a first heat exchange unit;
a second heat exchange unit; a kind of electronic device with high-pressure air-conditioning system
The magnetic refrigeration unit comprises at least two magnetic refrigeration structures which are communicated in parallel with the fluid driving mechanism, wherein the magnetic refrigeration structure comprises at least two magnetic working medium beds which can be used for switching magnetic states, at least one of the magnetic refrigeration structures is different from the other magnetic working medium bed, and the fluid driving mechanism can drive heat exchange fluid to flow back and forth along the first heat exchange unit, the magnetic refrigeration unit and the second heat exchange unit.
2. The magnetic refrigeration system of claim 1, further comprising a temperature sensor for sensing an ambient temperature, at least two control valve assemblies, one of the control valve assemblies corresponding to each of the magnetic refrigeration structures, the magnetic refrigeration structure comprising two communicating openings, one of the openings being in communication with the first heat exchange unit and the other of the openings being in communication with one end of the second heat exchange unit, and a controller, the control valve assemblies comprising two control valves, one of the control valves being for opening or closing the opening of the magnetic refrigeration structure adjacent to the first heat exchange unit and the other of the control valves being for opening or closing the opening of the magnetic refrigeration structure adjacent to the second heat exchange unit, all of the control valve assemblies and the temperature sensor being in communicative connection with the controller.
3. The magnetic refrigeration system of claim 1, wherein the first heat exchange unit comprises a first warm side heat exchanger, a first one-way valve and a second one-way valve, the first warm side heat exchanger is in parallel communication with the second one-way valve after being in series communication with the first one-way valve, and the heat exchange fluid is in opposite flow directions at the first one-way valve and the second one-way valve; the second heat exchange unit comprises a second hot end heat exchanger, a third one-way valve and a fourth one-way valve, wherein the second hot end heat exchanger is communicated with the third one-way valve in series and then is communicated with the fourth one-way valve in parallel, the flowing directions of heat exchange fluid in the third one-way valve and the fourth one-way valve are opposite, the flowing directions of the heat exchange fluid in the third one-way valve and the second one-way valve are the same, and the flowing directions of the heat exchange fluid in the fourth one-way valve and the first one-way valve are the same.
4. The magnetic refrigeration system of claim 1, wherein the magnetic working fluid bed comprises at least two pieces of magnetocaloric material having different curie temperatures.
5. The magnetic refrigeration system of claim 4, wherein the curie temperatures of all of the magnetocaloric material pieces are incremented or decremented by a preset temperature interval.
6. The magnetic refrigeration system of claim 1, wherein the magnetic refrigeration unit comprises a first magnetic refrigeration structure, a second magnetic refrigeration structure, and a third magnetic refrigeration structure, the first magnetic refrigeration structure, the second magnetic refrigeration structure, and the third magnetic refrigeration structure are in parallel communication with the fluid drive mechanism, and the first magnetic refrigeration structure comprises two first magnetic working substance beds of opposite magnetic states, the second magnetic refrigeration structure comprises two second magnetic working substance beds of opposite magnetic states, the third magnetic refrigeration structure comprises two third magnetic working substance beds of opposite magnetic states, the curie temperature of the first magnetic working substance bed is less than the curie temperature of the second magnetic working substance bed, and the curie temperature of the second magnetic working substance bed is less than the curie temperature of the third magnetic working substance bed.
7. The magnetic refrigeration system of claim 1, wherein the fluid drive mechanism comprises a first liquid trap in communication with one end of the first heat exchange unit and a second liquid trap in communication with one end of the second heat exchange unit, and wherein the first liquid trap and the second liquid trap are in opposite phase.
8. A magnetic refrigeration system as set forth in claim 7 wherein: the first liquid collector is provided with a first piston, the second liquid collector is provided with a second piston, and the running directions of the first piston and the second piston are opposite.
9. The magnetic refrigeration system of any of claims 1 to 8, wherein the number of first heat exchange units is two, the number of second heat exchange units is two, and the number of magnetic refrigeration units is two, wherein one of the first heat exchange units, one of the second heat exchange units, and one of the magnetic refrigeration units are sequentially in series communication to form a refrigeration group, and both of the refrigeration groups are in parallel communication with the fluid drive mechanism.
10. A refrigeration device comprising a magnetic refrigeration system according to any one of claims 1 to 9.
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| WO2021065397A1 (en) * | 2019-09-30 | 2021-04-08 | ダイキン工業株式会社 | Solid-state refrigeration device |
| CN112066589A (en) * | 2020-08-31 | 2020-12-11 | 中国科学院理化技术研究所 | Magnetic refrigeration system |
| CN112229087B (en) * | 2020-11-03 | 2024-04-05 | 珠海格力电器股份有限公司 | Magnetic refrigeration device, magnetic refrigeration system and magnetic refrigeration control method |
| CN112629057B (en) * | 2020-12-31 | 2024-03-29 | 包头稀土研究院 | Single-row multistage serial double-magnetic-field magnetic refrigerator and heat exchange method thereof |
| CN112629062A (en) * | 2020-12-31 | 2021-04-09 | 包头稀土研究院 | Single-row multistage tandem type refrigerating bin and refrigerating and heating method thereof |
| CN114909817B (en) * | 2022-04-13 | 2023-08-01 | 西安交通大学 | Regenerative thermomagnetic-magnetocaloric coupling refrigerating system and method |
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