CN110542253B - Magnetic refrigeration system and control method - Google Patents
Magnetic refrigeration system and control method Download PDFInfo
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- CN110542253B CN110542253B CN201910808286.9A CN201910808286A CN110542253B CN 110542253 B CN110542253 B CN 110542253B CN 201910808286 A CN201910808286 A CN 201910808286A CN 110542253 B CN110542253 B CN 110542253B
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- 238000005057 refrigeration Methods 0.000 title claims abstract description 63
- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000004891 communication Methods 0.000 claims description 11
- 238000003860 storage Methods 0.000 claims description 5
- 230000014759 maintenance of location Effects 0.000 claims description 4
- 101100134058 Caenorhabditis elegans nth-1 gene Proteins 0.000 claims 1
- 238000001816 cooling Methods 0.000 description 9
- 239000003507 refrigerant Substances 0.000 description 9
- 230000005347 demagnetization Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 230000005415 magnetization Effects 0.000 description 5
- 239000000696 magnetic material Substances 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 239000000110 cooling liquid Substances 0.000 description 3
- 230000017525 heat dissipation Effects 0.000 description 3
- OHMHBGPWCHTMQE-UHFFFAOYSA-N 2,2-dichloro-1,1,1-trifluoroethane Chemical compound FC(F)(F)C(Cl)Cl OHMHBGPWCHTMQE-UHFFFAOYSA-N 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- KYKAJFCTULSVSH-UHFFFAOYSA-N chloro(fluoro)methane Chemical compound F[C]Cl KYKAJFCTULSVSH-UHFFFAOYSA-N 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003252 repetitive effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B21/00—Machines, plants or systems, using electric or magnetic effects
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2321/00—Details of machines, plants or systems, using electric or magnetic effects
- F25B2321/002—Details of machines, plants or systems, using electric or magnetic effects by using magneto-caloric effects
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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]
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Devices That Are Associated With Refrigeration Equipment (AREA)
Abstract
A magnetic refrigeration system and a control method thereof, wherein the magnetic refrigeration system comprises N basic flow paths, each basic flow path is a heat exchange loop comprising a magnetic regenerator, the heat exchange loop of each basic flow path comprises heat flow time and cold flow time, the cycle period of the basic flow path is T, the N basic flow paths are connected in parallel, the phase difference of two adjacent basic flow paths of the N basic flow paths is T/N, the heat flow time T1 and the cold flow time T2 of each basic flow path satisfy the relation t1:t2= (N-1): 1, wherein N > = 2 is a natural number. The invention can stably realize refrigeration, can realize stable refrigeration of a refrigeration system, and can realize larger temperature span refrigeration by the same magnetic refrigeration structure.
Description
Technical Field
The invention relates to a refrigerating system and a control method, in particular to a magnetic refrigerating system and a control method.
Background
Refrigeration systems are widely used in the domestic and industrial fields, which utilize a refrigerant, such as a chlorofluorocarbon or hydrochlorofluorocarbon, to exchange heat with other media, such as air, during condensation and evaporation. However, such refrigerants may cause environmental problems such as destruction of the ozone layer and global warming.
Magnetic cooling devices are currently the best alternative to refrigerant cooling devices. The magnetic cooling device is a cooling device utilizing a magneto-caloric effect. Specifically, the magnetic cooling device utilizes the heat absorption or heat release process of the magnetic material due to the change of the magnetic field, thereby completing the heat exchange with the air.
In a conventional magnetic cooling device, at least one magnetic regenerator including a magnetic material rotates or reciprocates between the inside and outside of a magnetic field generated by a magnet, resulting in a temperature change of the magnetic material included in the magnetic regenerator. Because of the alternating cold and hot changes of the magnetic material, the continuity of cooling cannot be achieved by only one regenerator. Therefore, the continuous refrigeration realized by alternately working a plurality of cold accumulators is a problem which needs to be solved at present.
Chinese patent CN 109780751a discloses a magnetic refrigeration system, which, although it claims to achieve continuous refrigeration of the system with its control scheme, is not difficult to find by careful analysis, which only achieves continuous flow of cold storage liquid/cooling liquid and not continuity of the cooling liquid endothermic process. The scheme is that magnetization, hot flow and demagnetization and cold flow in a single basic flow path respectively account for half of the whole control period, which is unreasonable on a magnetic refrigerating system, and the scheme inevitably leads to unstable refrigeration, low refrigeration efficiency and small refrigeration temperature span.
Chinese patent document CN105452783a discloses a magnetic refrigeration device. In the document, a plurality of cold accumulators are alternately cooled by a permanent magnet rotation mode, and continuous cooling is realized by switching a flow path through a valve body. However, it is not difficult to analyze the scheme, and the flow path switching period is necessarily 1/2 of one refrigerating period. The problems of the method are the same as those of the Chinese patent document.
To achieve stable refrigeration and large temperature spans for magnetic refrigeration systems, a back-cooling/back-heating process is necessary. In the heat absorption process of the cold accumulator, the long-time flowing of the cooling liquid can increase the heat load of the refrigeration end and reduce the efficiency of the refrigeration system. Researches show that the heat absorption time of the cold accumulator is about 30% in a refrigeration cycle to be in a reasonable state.
Disclosure of Invention
In view of the above, the present invention provides a magnetic refrigeration system and a control method thereof, which can stably and continuously refrigerate. Specifically:
the control method of the magnetic refrigeration system comprises N basic flow paths, wherein each basic flow path is a heat exchange loop comprising a magnetic regenerator, the cycle period of each basic flow path is T, each cycle period T comprises heat flow time T1 and cold flow time T2, and the N basic flow paths are connected in parallel, and the control method further comprises the following steps:
when the magnetic refrigeration system exchanges heat: controlling the phase difference between two adjacent basic flow paths of the N basic flow paths to be T/N; the hot flow time t1 and the cold flow time t2 in each of the basic flow paths are controlled to satisfy the relation t1:t2= (N-1): 1, where N > =2, which is a natural number.
Preferably, each base flow path further comprises: a first heat exchanger in communication with the magnetic regenerator, and a second heat exchanger in communication with the magnetic regenerator.
Preferably, the N basic flow paths are connected in parallel in such a way that: the magnetic regenerator in each basic flow path is connected in parallel and then is respectively connected with the first heat exchanger and the second heat exchanger, and the first heat exchanger and the second heat exchanger are shared by each basic flow path.
Preferably, N is 3, and the magnetic regenerator in each basic flow path is connected in parallel and then connected with the first heat exchanger and the second heat exchanger through four-way pipes.
Preferably, the circulation switching between different basic flow paths is realized by switching the four-way pipe.
Preferably, when the N basic flow paths exchange heat: the phase difference of the N-1 th basic flow path subtracted from the phase of the N-th basic flow path is T/N; alternatively, the phase difference of the N-1 th basic flow path minus the phase of the N-th basic flow path is T/N.
A magnetic refrigeration system comprises N basic flow paths, wherein each basic flow path is a heat exchange loop comprising a magnetic regenerator, the circulation period of each basic flow path is T, the circulation period of each basic flow path comprises heat flow time T1 and cold flow time T2, the circulation period of each basic flow path is T, the N basic flow paths are connected in parallel, the phase difference between two adjacent basic flow paths of the N basic flow paths is T/N, the heat flow time T1 and the cold flow time T2 in each basic flow path satisfy the relation t1:t2= (N-1): 1, wherein N > = 2 is a natural number.
Preferably, each of the base flow paths includes a magnetic regenerator, a first heat exchanger coupled to the magnetic regenerator, and a second heat exchanger coupled to the magnetic regenerator.
Preferably, the N basic flow paths are connected in parallel in such a way that: the magnetic cold accumulator in each basic flow path is connected in parallel and then is respectively connected with the first heat exchanger and the second heat exchanger, and the first heat exchanger and the second heat exchanger are shared by each basic flow path.
Preferably, N is 3, and N base flow paths are 3 base flow paths, which are respectively first, second and third base flow paths.
Preferably, the first base flow path comprises a first magnetic regenerator, the second base flow path comprises a second magnetic regenerator, and the third base flow path comprises a third magnetic regenerator, wherein:
one end of the first heat exchanger is communicated with a fourth port of the first four-way pipe, and the first port, the second port and the third port of the first four-way pipe are respectively communicated with one ends of the first magnetic regenerator, the second magnetic regenerator and the third magnetic regenerator;
the other end of the first heat exchanger is communicated with a fourth port of a third four-way pipe, and the first port, the second port and the third port of the third four-way pipe are respectively communicated with one ends of the first magnetic regenerator, the second magnetic regenerator and the third magnetic regenerator;
one end of the second heat exchanger is communicated with a fourth port of the second four-way pipe, and the first port, the second port and the third port of the second four-way pipe are respectively communicated with one ends of the first magnetic regenerator, the second magnetic regenerator and the third magnetic regenerator;
the other end of the second heat exchanger is communicated with a fourth port of a fourth four-way pipe, and the first port, the second port and the third port of the fourth four-way pipe are respectively communicated with one ends of the first magnetic regenerator, the second magnetic regenerator and the third magnetic regenerator.
Preferably, at least one of the first, second, third magnetic regenerator is in communication with at least one of the first, second, third, fourth four-way pipes via a solenoid valve.
Preferably, the first, second and third magnetic cold storages are provided with electromagnetic valves at both ends.
Preferably, the phase difference of the nth basic flow path minus the N-1 th basic flow path is T/N; alternatively, the phase difference of the N-1 th basic flow path minus the phase of the N-th basic flow path is T/N.
Preferably, the first heat exchanger is formed as a heat dissipation end and the second heat exchanger forms a refrigeration end.
Preferably, n=4, t1=3t/4, t2=t/4.
The invention can stably realize refrigeration, can realize stable refrigeration of a refrigeration system, and can realize larger temperature span refrigeration by the same magnetic refrigeration structure. Wherein the temperature span refers to the temperature difference between the radiating end and the refrigerating end.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The above and other objects, features and advantages of the present disclosure will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings. The drawings described below are merely examples of the present disclosure and other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art.
Fig. 1 is a schematic diagram of the refrigeration system of the present invention.
Fig. 2 is a schematic diagram of the cold and hot flow cycles of each of the magnetic regenerators of the present invention.
FIG. 3 is a schematic diagram of the heat flow path of the refrigeration system of the present invention in the range of 0 to T/3.
FIG. 4 is a schematic diagram of the heat flow path of the refrigeration system of the present invention during a time period of T/3 to 2T/3.
FIG. 5 is a schematic diagram of the heat flow path of the refrigeration system of the present invention in 2T/3-T time.
Wherein: 40-1, a first heat exchanger; 40-2, a second heat exchanger; 30-1, a first four-way pipe; 30-2, a second four-way pipe; 30-3, a third four-way pipe; 30-4, a fourth four-way pipe; 20-1, a first solenoid valve; 20-2, a second solenoid valve; 20-3, a third electromagnetic valve; 20-4, a fourth electromagnetic valve; 20-5, a fifth electromagnetic valve; 20-6, a sixth electromagnetic valve; h, a radiating end; and C, preparing a cold end.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments can be embodied in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar parts, and thus a repetitive description thereof will be omitted.
Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the disclosure. One skilled in the relevant art will recognize, however, that the disclosed aspects may be practiced without one or more of the specific details, or with other methods, components, devices, steps, etc. In other instances, well-known methods, devices, implementations, or operations are not shown or described in detail to avoid obscuring aspects of the disclosure.
It will be understood that, although the terms first, second, third, etc. may be used herein to describe various structures, these structures should not be limited by these terms. These terms are used to distinguish one structure from another structure. Thus, a first structure discussed below may be referred to as a second structure without departing from the teachings of the disclosed concepts. As used herein, the term "and/or" includes any one of the associated listed items and all combinations of one or more.
Those skilled in the art will appreciate that the drawings are schematic representations of example embodiments and that the modules or flows in the drawings are not necessarily required to practice the present disclosure, and therefore, should not be taken to limit the scope of the present disclosure.
The details of the embodiments of the present invention are described below with reference to fig. 1-2:
the control method of the magnetic refrigeration system comprises N basic flow paths, wherein each basic flow path is a heat exchange loop comprising a magnetic regenerator, the cycle period of each basic flow path is T, each cycle period T comprises heat flow time T1 and cold flow time T2, and the N basic flow paths are connected in parallel, and the control method further comprises the following steps:
when the magnetic refrigeration system exchanges heat: controlling the phase difference between two adjacent basic flow paths of the N basic flow paths to be T/N; the hot flow time t1 and the cold flow time t2 in each of the basic flow paths are controlled to satisfy the relation t1:t2= (N-1): 1, where N > =2, which is a natural number.
The phase difference between two adjacent basic flow paths is T/N, namely the phase difference between the N and the N-1 or the N+1 is T/N. That is, when the refrigerator is operated, the two basic flow paths have a phase difference so that the entire refrigerator can be cooled stably. Cold flow refers to the process of circulating the refrigerant between the refrigeration side C and the magnetic regenerator. Thermal flow refers to the process of circulating the refrigerant between the heat dissipating end H and the magnetic regenerator. The phase change of different basic flow paths can be realized by controlling the magnetization and demagnetization of the magnetic regenerator or by controlling different starting times of the basic flow paths, and the proportion of cold flow time and hot flow time can be controlled by controlling the magnetization and demagnetization of the magnetic regenerator.
Preferably, each base flow path further comprises: a first heat exchanger (40-1) in communication with the magnetic regenerator, and a second heat exchanger 40-2 in communication with the magnetic regenerator.
Preferably, the N basic flow paths are connected in parallel in such a way that: the magnetic regenerator in each basic flow path is connected in parallel and then connected to the first heat exchanger 40-1 and the second heat exchanger 40-2, respectively, and the first heat exchanger 40-1 and the second heat exchanger 40-2 are shared by the respective basic flow paths.
Preferably, N is 3, and the magnetic regenerator in each basic flow path is connected in parallel and then connected with the first heat exchanger 40-1 and the second heat exchanger 40-2 respectively through four-way pipes.
Preferably, the circulation switching between different basic flow paths is realized by switching the four-way pipe.
The four-way pipe is provided with four ports, and different basic flow paths can be switched through controlling the ports.
Preferably, when the N basic flow paths exchange heat: the phase difference of the N-1 th basic flow path subtracted from the phase of the N-th basic flow path is T/N; alternatively, the phase difference of the N-1 th basic flow path minus the phase of the N-th basic flow path is T/N.
In addition, the invention also provides a magnetic refrigeration system, which comprises N basic flow paths, wherein each basic flow path is a heat exchange loop comprising a magnetic regenerator, the cycle period of each basic flow path is T, each cycle period T comprises heat flow time T1 and cold flow time T2, the N basic flow paths are connected in parallel, the phase difference between two adjacent basic flow paths of the N basic flow paths is T/N, the heat flow time T1 and the cold flow time T2 in each basic flow path satisfy the relation t1:t2= (N-1): 1, wherein N > = 2 is a natural number.
The phase difference between two adjacent basic flow paths is T/N, namely the phase difference between the N and the N-1 or the N+1 is T/N. That is, when the refrigerator is operated, the two basic flow paths have a phase difference so that the entire refrigerator can be cooled stably. Cold flow refers to the process of circulating the refrigerant between the refrigeration side C and the magnetic regenerator. Thermal flow refers to the process of circulating the refrigerant between the heat dissipating end H and the magnetic regenerator. The phase change of different basic flow paths can be realized by controlling the magnetization and demagnetization of the magnetic regenerator or by controlling different starting times of the basic flow paths, and the proportion of cold flow time and hot flow time can be controlled by controlling the magnetization and demagnetization of the magnetic regenerator.
Preferably, each of the base flow paths includes a magnetic regenerator, a first heat exchanger 40-1 coupled to the magnetic regenerator, and a second heat exchanger 40-2 coupled to the magnetic regenerator.
Preferably, the N basic flow paths are connected in parallel in such a way that: the magnetic regenerator in each basic flow path is connected in parallel and then connected to the first heat exchanger 40-1 and the second heat exchanger 40-2, respectively, and the first heat exchanger 40-1 and the second heat exchanger 40-2 are shared by the respective basic flow paths.
Preferably, N is 3, and N base flow paths are 3 base flow paths, which are respectively first, second and third base flow paths.
Preferably, the first base flow path comprises a first magnetic regenerator, the second base flow path comprises a second magnetic regenerator, and the third base flow path comprises a third magnetic regenerator, wherein:
one end of the first heat exchanger 40-1 is communicated with a fourth port of the first four-way pipe 30-1, and the first port, the second port and the third port of the first four-way pipe 30-1 are respectively communicated with one ends of the first magnetic regenerator, the second magnetic regenerator and the third magnetic regenerator;
the other end of the first heat exchanger 40-1 is communicated with a fourth port of the third four-way pipe 30-3, and the first port, the second port and the third port of the third four-way pipe 30-3 are respectively communicated with one ends of the first magnetic regenerator, the second magnetic regenerator and the third magnetic regenerator;
one end of the second heat exchanger 40-2 is communicated with a fourth port of the second four-way pipe 30-2, and the first port, the second port and the third port of the second four-way pipe 30-2 are respectively communicated with one ends of the first magnetic regenerator, the second magnetic regenerator and the third magnetic regenerator;
the other end of the second heat exchanger 40-2 is communicated with a fourth port of the fourth four-way pipe 30-4, and the first, second and third ports of the fourth four-way pipe 30-4 are respectively communicated with one ends of the first, second and third magnetic cold storages.
Preferably, at least one of the first, second, and third magnetic regenerators is in communication with at least one of the first, second, third, and fourth four-way pipes 30-4 via a solenoid valve.
Preferably, the first, second and third magnetic cold storages are provided with electromagnetic valves at both ends.
Preferably, the phase difference of the nth basic flow path minus the N-1 th basic flow path is T/N; alternatively, the phase difference of the N-1 th basic flow path minus the phase of the N-th basic flow path is T/N.
Preferably, the first heat exchanger 40-1 is formed as a heat dissipating end H and the second heat exchanger 40-2 is formed as a refrigeration end C.
Preferably, n=4, t1=3t/4, t2=t/4.
Preferably, the four-way pipe of the present invention may be a four-way valve.
The principle and operation of the magnetic refrigeration system and its control method of the present invention are further described below with reference to fig. 1 and 2: as shown in fig. 1, there are N, N is a natural number of 2 or more, preferably 3 parallel basic flow paths, in a magnetic refrigeration system and a control method thereof. Fig. 1 schematically illustrates a parallel connection mode of 3 basic flow paths, wherein after the magnetic regenerator is connected in parallel, loops are respectively formed by a four-way pipe, a heat dissipation end H and a refrigerating end C, and switching among different basic flow paths is controlled by the four-way pipe.
The refrigerating system comprises a first heat exchanger 40-1, a second heat exchanger 40-2, a four-way pipe, a magnetic regenerator and an electromagnetic valve, wherein the first heat exchanger 40-1 forms a radiating end H, and the second heat exchanger 40-2 forms a refrigerating end C; the four-way pipe comprises a first four-way pipe 30-1, a second four-way pipe 30-2, a third four-way pipe 30-3 and a fourth four-way pipe 30-4; the magnetic regenerator comprises a first magnetic regenerator, a second magnetic regenerator, a third magnetic regenerator and a fourth magnetic regenerator; the solenoid valves include a first solenoid valve 20-1, a second solenoid valve 20-2, a third solenoid valve 20-3, a fourth solenoid valve 20-4, a fifth solenoid valve 20-5, and a sixth solenoid valve 20-6.
As shown in fig. 2, the phase difference between each adjacent basic flow paths is T/3, and the relationship T1 is satisfied between the hot flow time T1 and the cold flow time T2 of each basic flow path: t2=2: 1. cold flow refers to the process of circulating a refrigerant between the refrigeration side C and the magnetic regenerator. Thermal flow refers to the process of circulating the refrigerant between the heat dissipating end H and the magnetic regenerator. As shown in FIG. 2 and Table one, the distribution of cold and hot flow times for each magnetic regenerator is shown in Table one, it can be seen that the cold flow time is only 1/3T in one working cycle T, and the rest is the hot flow time.
List one
As shown in fig. 1 and 2, the specific working process of the invention is as follows:
cold flow path in 0-T/3 time:
the second heat exchanger 40-2- > the second four-way pipe 30-2- > the fifth electromagnetic valve 20-5- > the first magnetic regenerator- > the sixth electromagnetic valve 20-6- > the fourth four-way pipe 30-4- > the second heat exchanger 40-2;
thermal flow path: as shown in fig. 3, wherein the heat flow path is illustrated.
During the time T/3-2T/3, the cold flow path:
the second heat exchanger 40-2- > the second four-way pipe 30-2- > the third solenoid valve 20-3- > the second magnetic regenerator- > the fourth solenoid valve 20-4- > the fourth four-way pipe 30-4- > the second heat exchanger 40-2.
The thermal flow path is shown in fig. 4, where the thermal flow path is illustrated.
During 2T/3-T time, cold flow path:
the second heat exchanger 40-2- > the second four-way pipe 30-2- > the first electromagnetic valve 20-1- > the third magnetic regenerator- > the second electromagnetic valve 20-2- > the fourth four-way pipe 30-4- > the second heat exchanger 40-2.
The thermal flow path is shown in fig. 5, where the thermal flow path is illustrated.
The invention can realize the stable refrigeration of the refrigeration system by controlling the phase difference and the cold and hot flowing time, the same magnetic refrigeration system realizes larger temperature span refrigeration,
the beneficial effects are that:
the refrigerating system and the control method thereof can realize stable refrigeration of the refrigerating system, and the same magnetic refrigerating structure can realize larger temperature span refrigeration. The optimal scheme of the invention adopts a parallel connection mode of 3 basic flow paths, wherein after the magnetic regenerator is connected in parallel, loops are respectively formed by the four-way pipe, the heat dissipation end H and the refrigerating end C, and the switching among different basic flow paths is controlled by the four-way pipe, so that the magnetic regenerator has a simple structure, can effectively reduce the cost and improve the efficiency.
Exemplary embodiments of the present disclosure are specifically illustrated and described above. It is to be understood that this disclosure is not limited to the particular arrangements, instrumentalities and methods of implementation described herein; on the contrary, the disclosure is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.
Claims (11)
1. The control method of the magnetic refrigeration system, the said magnetic refrigeration system includes N basic flow paths, each basic flow path is a heat exchange loop including magnetic regenerator, the cycle period of each basic flow path is T, include hot flow time T1 and cold flow time T2 in each cycle period T, N basic flow paths connect in parallel, characterized by that, each basic flow path also includes: a first heat exchanger (40-1) in communication with the magnetic regenerator, a second heat exchanger (40-2) in communication with the magnetic regenerator;
the N basic flow paths are connected in parallel in the following way: the magnetic cold storages in the basic flow paths are connected in parallel and then are respectively connected with the first heat exchanger (40-1) and the second heat exchanger (40-2), and the basic flow paths share the first heat exchanger (40-1) and the second heat exchanger (40-2);
the control method comprises the following steps:
when the magnetic refrigeration system exchanges heat: controlling the phase difference between two adjacent basic flow paths of the N basic flow paths to be T/N; the hot flow time t1 and the cold flow time t2 in each of the basic flow paths are controlled to satisfy the relation t1:t2= (N-1): 1, where N > =3, which is a natural number.
2. The control method according to claim 1, wherein N is 3, and the magnetic regenerator in each of the basic flow paths is connected in parallel and then is respectively connected to the first heat exchanger (40-1) and the second heat exchanger (40-2) via a four-way pipe.
3. The control method according to claim 2, wherein the switching of the heat exchange cycle between different basic flow paths is achieved by switching of a four-way pipe.
4. A control method according to any one of claims 1 to 3, wherein when the N basic flow paths exchange heat: the phase difference of the N-1 th basic flow path subtracted from the phase of the N-th basic flow path is T/N; alternatively, the phase difference of the N-1 th basic flow path minus the phase of the N-th basic flow path is T/N.
5. A magnetic refrigeration system comprises N basic flow paths, wherein each basic flow path is a heat exchange loop comprising a magnetic regenerator, the cycle period of each basic flow path is T, and each cycle period T comprises heat flow time T1 and cold flow time T2, and the magnetic refrigeration system is characterized in that the N basic flow paths are connected in parallel, the phase difference between two adjacent basic flow paths of the N basic flow paths is T/N, and the heat flow time T1 and the cold flow time T2 in each basic flow path meet the relation t1:t2= (N-1): 1, wherein N > = 3 is a natural number;
each base flow path further includes: a first heat exchanger (40-1) in communication with the magnetic regenerator, a second heat exchanger (40-2) in communication with the magnetic regenerator;
the N basic flow paths are connected in parallel in the following way: the magnetic regenerator in each basic flow path is connected in parallel and then is respectively communicated with the first heat exchanger (40-1) and the second heat exchanger (40-2), and the first heat exchanger (40-1) and the second heat exchanger (40-2) are shared by the basic flow paths.
6. The magnetic refrigeration system of claim 5, wherein N is 3, and N base flow paths are 3 base flow paths, first, second, and third base flow paths, respectively.
7. The magnetic refrigeration system of claim 6, wherein the first base flow path comprises a first magnetic regenerator, the second base flow path comprises a second magnetic regenerator, and the third base flow path comprises a third magnetic regenerator, wherein:
one end of the first heat exchanger (40-1) is communicated with a fourth port of the first four-way pipe (30-1), and the first port, the second port and the third port of the first four-way pipe (30-1) are respectively communicated with one ends of the first magnetic regenerator, the second magnetic regenerator and the third magnetic regenerator;
the other end of the first heat exchanger (40-1) is communicated with a fourth port of the third four-way pipe (30-3), and the first port, the second port and the third port of the third four-way pipe (30-3) are respectively communicated with the other ends of the first magnetic regenerator, the second magnetic regenerator and the third magnetic regenerator;
one end of the second heat exchanger (40-2) is communicated with a fourth port of the second four-way pipe (30-2), and the first port, the second port and the third port of the second four-way pipe (30-2) are respectively communicated with one ends of the first magnetic regenerator, the second magnetic regenerator and the third magnetic regenerator;
the other end of the second heat exchanger (40-2) is communicated with a fourth port of the fourth four-way pipe (30-4), and the first port, the second port and the third port of the fourth four-way pipe (30-4) are respectively communicated with the other ends of the first magnetic regenerator, the second magnetic regenerator and the third magnetic regenerator.
8. The magnetic refrigeration system of claim 7, wherein at least one of the first, second, and third magnetic regenerators is in communication with at least one of the first, second, third, and fourth quads (30-4) via a solenoid valve.
9. The magnetic refrigeration system of claim 8, wherein the first, second and third magnetic regenerators are each provided with a solenoid valve at both ends.
10. A magnetic refrigeration system according to any of claims 5 to 9, wherein the phase difference of the nth base flow path minus the nth-1 base flow path is T/N; alternatively, the phase difference of the N-1 th basic flow path minus the phase of the N-th basic flow path is T/N.
11. A magnetic refrigeration system according to any of claims 5-9, characterized in that the first heat exchanger (40-1) is formed as a heat-dissipating end (H) and the second heat exchanger (40-2) is formed as a refrigeration end (C).
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