阅读说明：本技术 一种磁制冷系统及控制方法 (Magnetic refrigeration system and control method ) 是由 刘�东 徐文山 于 2019-08-29 设计创作，主要内容包括：一种磁制冷系统及其控制方法,磁制冷系统包括N个基础流路,每个基础流路为包括磁蓄冷器的换热回路,每个基础流路的换热循环包括热流动时间和冷流动时间,基础流路的循环周期为T,N个基础流路并联连接,N个基础流路相邻两个基础流路的相位差为T/N,每个基础流路中热流动时间t1和冷流动时间t2满足关系式t1:t2＝(N-1):1,其中N>＝2,其为自然数。采用本发明可以稳定的实现制冷,可以实现制冷系统的稳定制冷,相同的磁制冷结构实现更大的温跨制冷。(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 cycle of each basic flow path comprises heat flow time and cold flow time, the cycle period of each 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, and the heat flow time T1 and the cold flow time T2 in each basic flow path satisfy the relation T1: T2 ═ 1 (N-1), wherein N > -2 is a natural number. The invention can realize refrigeration stably, realize stable refrigeration of a refrigeration system, and realize larger temperature span refrigeration by the same magnetic refrigeration structure.)

1. A control method of a magnetic refrigeration system, the magnetic refrigeration system comprises N basic flow paths, 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 a hot flow time T1 and a cold flow time T2, and the N basic flow paths are connected in parallel, and the control method is characterized in that: also comprises the following steps:

When the magnetic refrigeration system exchanges heat: controlling the phase difference of 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 base flow path are controlled to satisfy the relation t1: t2 ═ (N-1):1, where N > -2, which is a natural number.

2. The control method according to claim 1, characterized in that: each base flow path further includes: a first heat exchanger (40-1) communicated with the magnetic regenerator, and a second heat exchanger (40-2) communicated with the magnetic regenerator.

3. the control method according to claim 2, characterized in that: the parallel connection mode of the N basic flow paths is as follows: the magnetic regenerators in the respective base flow paths are 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 base flow paths.

4. The control method according to claim 3, characterized in that: n is 3, and the magnetic cold accumulators in the basic flow paths are connected in parallel and then are respectively communicated with the first heat exchanger (40-1) and the second heat exchanger (40-2) through a four-way pipe.

5. the control method according to claim 4, characterized in that: and the heat exchange circulation switching among different basic flow paths is realized through the switching of the four-way pipe.

6. The control method according to any one of claims 1 to 5, characterized in that: when N basic flow paths exchange heat: subtracting the phase difference of the (N-1) th basic flow path from the phase of the Nth basic flow path to obtain T/N; alternatively, the phase difference obtained by subtracting the phase of the Nth base channel from the phase of the Nth base channel is T/N.

7. A magnetic refrigeration system comprises N basic flow paths, 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 a hot flow time T1 and a cold flow time T2, and the magnetic refrigeration system is characterized in that: 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 hot 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, which is a natural number.

8. The magnetic refrigeration system of claim 7 wherein: each base flow path further includes: a first heat exchanger (40-1) communicated with the magnetic regenerator, and a second heat exchanger (40-2) communicated with the magnetic regenerator.

9. The magnetic refrigeration system of claim 8 wherein: the parallel connection mode of the N basic flow paths is as follows: the magnetic regenerators in the base flow paths are connected in parallel and then communicate with 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 base flow paths.

10. The magnetic refrigeration system of claim 9 wherein: n is 3, and the N base channels are 3 base channels, which are the first, second, and third base channels, respectively.

11. the magnetic refrigeration system of claim 10 wherein: the first base flow path includes a first magnetic regenerator, the second base flow path includes a second magnetic regenerator, and the third base flow path includes 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 a first port, a second port and a third port of the first four-way pipe (30-1) are respectively communicated with one end of a first magnetic regenerator, one end of a second magnetic regenerator and one end of a third magnetic regenerator;

The other end of the first heat exchanger (40-1) is communicated with a fourth port of a third four-way pipe (30-3), and a first port, a second port and a third port of the third four-way pipe (30-3) are respectively communicated with one end of a first magnetic regenerator, one end of a second magnetic regenerator and one end of a 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 a first port, a second port and a third port of the second four-way pipe (30-2) are respectively communicated with one end of a first magnetic regenerator, one end of a second magnetic regenerator and one end of a third magnetic regenerator;

The other end of the second heat exchanger (40-2) is communicated with a fourth port of a fourth four-way pipe (30-4), and a first port, a second port and a 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.

12. The magnetic refrigeration system of claim 11 wherein: at least one of the first, second and third magnetic regenerators is communicated with at least one of the first, second, third and fourth four-way pipes (30-4) through an electromagnetic valve.

13. the magnetic refrigeration system of claim 12 wherein: the two ends of the first magnetic regenerator, the second magnetic regenerator and the third magnetic regenerator are respectively provided with an electromagnetic valve.

14. A magnetic refrigeration system according to any of claims 7 to 13 wherein: subtracting the phase difference of the (N-1) th basic flow path from the phase of the Nth basic flow path to obtain T/N; alternatively, the phase difference obtained by subtracting the phase of the Nth base channel from the phase of the Nth base channel is T/N.

15. A magnetic refrigeration system according to any of claims 8 to 13 wherein: the first heat exchanger (40-1) is formed as a heat radiation side (H), and the second heat exchanger (40-2) is formed as a cooling side (C).

Technical Field

The invention relates to a refrigeration system and a control method, in particular to a magnetic refrigeration system and a control method.

Background

Refrigeration systems, which utilize a refrigerant, such as a chlorofluorocarbon or a hydrochlorofluorocarbon, to exchange heat with other media, such as air, during condensation and evaporation, are widely used in the home and industrial fields. However, such refrigerants may cause environmental problems such as destruction of the ozone layer and global warming.

Magnetic cooling devices are currently the best choice for replacing refrigerant cooling devices. The magnetic cooling device is a cooling device utilizing a magnetocaloric effect. Specifically, the magnetic cooling device utilizes the heat absorption or 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 the outside of a magnetic field generated by a magnet, resulting in a temperature change of the magnetic material included in the magnetic regenerator. Due to the alternating change of the cold and the heat of the magnetic material, only one regenerator cannot realize the continuity of the refrigeration. Therefore, the problem that a plurality of cold accumulators work alternately to realize refrigeration continuity is in urgent need at present.

Chinese patent document CN 109780751a, discloses a magnetic refrigeration system, although it claims to achieve continuous refrigeration of the system using its control scheme, it is not difficult to find by careful analysis that it only achieves continuous flow of cold storage/cooling liquid, not continuity of the cooling liquid endothermic process. The scheme is that magnetization + heat flow and demagnetization + cold flow in a single basic flow path respectively account for half of the whole control period, which is unreasonable on a magnetic refrigeration system, and the scheme inevitably causes unstable refrigeration, low refrigeration efficiency and small refrigeration temperature span.

Chinese patent document CN105452783A discloses a magnetic refrigeration device. The document realizes alternate refrigeration of a plurality of cold accumulators by a permanent magnet rotation mode, and realizes continuous refrigeration by switching flow paths 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 refrigeration cycle. The existing problems are the same as the above Chinese patent document.

in order to achieve stable refrigeration and large temperature span of the magnetic refrigeration system, a back cooling/back heating process is necessary. In the heat absorption process of the regenerator, the heat load of the refrigerating end can be increased by the long-time flowing of the cooling liquid, and the efficiency of the refrigerating system is reduced. Research shows that in one refrigerating period, the heat absorption time of the cold accumulator accounts for about 30% of the reasonable state.

Disclosure of Invention

In view of this, the present invention provides a magnetic refrigeration system and a control method thereof, which can perform stable continuous refrigeration. Specifically, the method comprises the following steps:

A control method of a magnetic refrigeration system, wherein the magnetic refrigeration system comprises N basic flow paths, 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 a hot flow time T1 and a 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 of 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 base flow path 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: the first heat exchanger is communicated with the magnetic regenerator, and the second heat exchanger is communicated with the magnetic regenerator.

preferably, the N base flow paths are connected in parallel in a manner that: the magnetic regenerators in the respective base flow paths are connected in parallel and then connected to the first heat exchanger and the second heat exchanger, respectively, and the first heat exchanger and the second heat exchanger are shared by the respective base flow paths.

Preferably, N is 3, and the magnetic regenerators in the respective base flow paths are connected in parallel and then connected to the first heat exchanger and the second heat exchanger through a four-way pipe, respectively.

Preferably, the cyclic switching between the different base flow paths is achieved by switching of a four-way pipe.

Preferably, when the N basic flow paths exchange heat: subtracting the phase difference of the (N-1) th basic flow path from the phase of the Nth basic flow path to obtain T/N; alternatively, the phase difference obtained by subtracting the phase of the Nth base channel from the phase of the Nth base channel is T/N.

A magnetic refrigeration system comprises N basic flow paths, each basic flow path is a heat exchange loop comprising a magnetic regenerator, the cycle period of each basic flow path is T, the cycle period T comprises a heat flow time T1 and a cold flow time T2, the cycle 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, and 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 > is 2, and is a natural number.

Preferably, each base flow path includes a magnetic regenerator, a first heat exchanger connected to the magnetic regenerator, and a second heat exchanger connected to the magnetic regenerator.

preferably, the N base flow paths are connected in parallel in a manner that: the magnetic regenerators in the basic flow paths are connected in parallel and then are respectively connected with the first heat exchanger and the second heat exchanger, and the basic flow paths share the first heat exchanger and the second heat exchanger.

Preferably, N is 3, and the N base channels are 3 base channels, which are the first, second, and third base channels, respectively.

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 a first port, a second port and a third port of the first four-way pipe are respectively communicated with one end of a first magnetic regenerator, one end of a second magnetic regenerator and one end of a third magnetic regenerator;

The other end of the first heat exchanger is communicated with a fourth port of a third four-way pipe, and a first port, a second port and a third port of the third four-way pipe are respectively communicated with one end of a first magnetic regenerator, one end of a second magnetic regenerator and one end of a third magnetic regenerator;

one end of the second heat exchanger is communicated with a fourth port of the second four-way pipe, and a first port, a second port and a third port of the second four-way pipe are respectively communicated with one end of a first magnetic regenerator, one end of a second magnetic regenerator and one end of a third magnetic regenerator;

The other end of the second heat exchanger is communicated with a fourth port of a fourth four-way pipe, and a first port, a second port and a third port of the fourth four-way pipe are respectively communicated with one end of a first magnetic regenerator, one end of a second magnetic regenerator and one end of a third magnetic regenerator.

Preferably, at least one of the first, second and third magnetic regenerators is communicated with at least one of the first, second, third and fourth four-way pipes through a solenoid valve.

preferably, the first, second and third magnetic regenerators are provided with electromagnetic valves at both ends.

Preferably, the phase difference of the Nth basic flow path minus the phase difference of the (N-1) th basic flow path is T/N; alternatively, the phase difference obtained by subtracting the phase of the Nth base channel from the phase of the Nth base channel is T/N.

Preferably, the first heat exchanger forms a heat dissipation end and the second heat exchanger forms a refrigeration end.

Preferably, N is 4, T1 is 3T/4, and T2 is T/4.

The invention can realize refrigeration stably, realize stable refrigeration of a refrigeration system, and realize larger temperature span refrigeration by the same magnetic refrigeration structure. The medium temperature span refers to the temperature difference between the heat dissipation end and the cooling 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 some embodiments of the present disclosure, and other drawings may be derived from those drawings by those of ordinary skill in the art without inventive effort.

FIG. 1 is a schematic view of the refrigeration system of the present invention.

fig. 2 is a schematic diagram showing the cold and hot flow cycles of each magnetic regenerator of the present invention.

FIG. 3 is a schematic diagram of the heat flow path of the refrigeration system of the present invention between time 0 and time T/3.

FIG. 4 is a schematic diagram of a heat flow path of the refrigeration system of the present invention during time T/3 to 2T/3.

FIG. 5 is a schematic diagram of the heat flow path of the refrigeration system of the present invention during the time interval of 2T/3T.

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 electromagnetic 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 heat dissipation end; and C, cooling.

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different 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 example embodiments to those skilled in the art. The same reference numerals denote the same or similar parts in the drawings, 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 subject matter of the present disclosure can be practiced without one or more of the specific details, or with other methods, components, devices, steps, and so forth. In other instances, well-known methods, devices, implementations, or operations have not been 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 termed a second structure without departing from the teachings of the disclosed concept. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

It is to be understood by those skilled in the art that the drawings are merely schematic representations of exemplary embodiments, and that the blocks or processes shown in the drawings are not necessarily required to practice the present disclosure and are, therefore, not intended to limit the scope of the present disclosure.

the following detailed description of embodiments of the invention is provided in conjunction with the accompanying figures 1-2:

A control method of a magnetic refrigeration system, wherein the magnetic refrigeration system comprises N basic flow paths, 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 a hot flow time T1 and a 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 of 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 base flow path 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, which means that the phase difference between the Nth basic flow path and the Nth basic flow path or the N +1 th basic flow path is T/N. That is, the two base flow paths may be operated with a phase difference so that the entire cooling system can be stabilized. The cold flow refers to a process of circulating a refrigerant between the refrigerating end C and the magnetic regenerator. The heat flow refers to a process in which the refrigerant circulates between the heat radiating end H and the magnetic regenerator. The change of phases of different basic flow paths can be realized by controlling the magnetization and demagnetization of the magnetic regenerator or controlling different starting time 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) communicated with the magnetic regenerator, and a second heat exchanger (40-2) communicated with the magnetic regenerator.

Preferably, the N base flow paths are connected in parallel in a manner that: the magnetic regenerators in the respective base flow paths are 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 base flow paths.

Preferably, N is 3, and the magnetic regenerators in the respective base flow paths are connected in parallel and then connected to the first heat exchanger 40-1 and the second heat exchanger 40-2 through a four-way pipe, respectively.

Preferably, the cyclic switching between the different base flow paths is achieved by switching of a four-way pipe.

the four-way pipe is provided with four ports, and switching between different basic flow paths can be realized through controlling the ports.

Preferably, when the N basic flow paths exchange heat: subtracting the phase difference of the (N-1) th basic flow path from the phase of the Nth basic flow path to obtain T/N; alternatively, the phase difference obtained by subtracting the phase of the Nth base channel from the phase of the Nth base channel is T/N.

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 a hot flow time T1 and a 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, and the hot flow time T1 and the cold flow time T2 in each basic flow path satisfy the relation T1: T2 ═ 1 (N-1), wherein N > -2 is a natural number.

The phase difference between two adjacent basic flow paths is T/N, which means that the phase difference between the Nth basic flow path and the Nth basic flow path or the N +1 th basic flow path is T/N. That is, the two base flow paths may be operated with a phase difference so that the entire cooling system can be stabilized. The cold flow refers to a process of circulating a refrigerant between the refrigerating end C and the magnetic regenerator. The heat flow refers to a process in which the refrigerant circulates between the heat radiating end H and the magnetic regenerator. The change of phases of different basic flow paths can be realized by controlling the magnetization and demagnetization of the magnetic regenerator or controlling different starting time 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 includes a magnetic regenerator, a first heat exchanger 40-1 connected to the magnetic regenerator, and a second heat exchanger 40-2 connected to the magnetic regenerator.

preferably, the N base flow paths are connected in parallel in a manner that: the magnetic regenerators in the respective base flow paths are 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 base flow paths.

Preferably, N is 3, and the N base channels are 3 base channels, which are the first, second, and third base channels, respectively.

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 a first port, a second port and a third port of the first four-way pipe 30-1 are respectively communicated with one end of a first magnetic regenerator, one end of a second magnetic regenerator and one end of a third magnetic regenerator;

The other end of the first heat exchanger 40-1 is communicated with a fourth port of a third four-way pipe 30-3, and a first port, a second port and a third port of the third four-way pipe 30-3 are respectively communicated with one end of a first magnetic regenerator, one end of a second magnetic regenerator and one end of a 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 a first port, a second port and a third port of the second four-way pipe 30-2 are respectively communicated with one end of a first magnetic regenerator, one end of a second magnetic regenerator and one end of a third magnetic regenerator;

The other end of the second heat exchanger 40-2 is communicated with a fourth port of a fourth four-way pipe 30-4, and a first port, a second port and a third port of the fourth four-way pipe 30-4 are respectively communicated with one end of a first magnetic regenerator, one end of a second magnetic regenerator and one end of a third magnetic regenerator.

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 through a solenoid valve.

Preferably, the first, second and third magnetic regenerators are provided with electromagnetic valves at both ends.

Preferably, the phase difference of the Nth basic flow path minus the phase difference of the (N-1) th basic flow path is T/N; alternatively, the phase difference obtained by subtracting the phase of the Nth base channel from the phase of the Nth base channel is T/N.

Preferably, the first heat exchanger 40-1 forms a heat dissipation end H and the second heat exchanger 40-2 forms a refrigeration end C.

Preferably, N is 4, T1 is 3T/4, and T2 is T/4.

Preferably, the four-way pipe of the present invention may be a four-way valve.

The principles and operation of the magnetic refrigeration system and the control method thereof according to the present invention will be further described with reference to fig. 1 and 2: as shown in fig. 1, there are N magnetic refrigeration systems and control methods thereof, where N is a natural number of 2 or more, and preferably 3 parallel basic flow paths. Fig. 1 shows that 3 basic flow paths are connected in parallel, wherein after being connected in parallel, magnetic cold accumulators respectively form a loop through a four-way pipe, a heat dissipation end H and a refrigeration end C, and the four-way pipe is used for controlling the switching among different basic flow paths.

The refrigeration 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 heat dissipation end H, and the second heat exchanger 40-2 forms a refrigeration end C; the four-way pipes comprise 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 electromagnetic valves comprise a first electromagnetic valve 20-1, a second electromagnetic valve 20-2, a third electromagnetic valve 20-3, a fourth electromagnetic valve 20-4, a fifth electromagnetic valve 20-5 and a sixth electromagnetic valve 20-6.

As shown in fig. 2, the phase difference between each adjacent base flow path is T/3, and the relationship T1 is satisfied between the hot flow time T1 and the cold flow time T2 of each base flow path: t2 ═ 2: 1. the cold flow refers to a process in which a refrigerant circulates between the refrigerant end C and the magnetic regenerator. The heat flow refers to a process in which the refrigerant circulates between the heat radiating end H and the magnetic regenerator. As shown in fig. 2 and table one, the first table shows the cold and hot flow time distribution of each magnetic regenerator, and it can be seen that the cold flow time is only 1/3T in one working cycle T, and the rest are hot flow times.

Watch 1

As shown in fig. 1 and 2, the specific working process of the present invention is as follows:

in the time of 0-T/3, the cold flow path:

A second heat exchanger 40-2, a second four-way pipe 30-2, a fifth electromagnetic valve 20-5, a first magnetic cold accumulator, a sixth electromagnetic valve 20-6, a fourth four-way pipe 30-4 and the second heat exchanger 40-2;

Heat flow path: as shown in fig. 3, in which the heat flow path is illustrated.

in the time of T/3-2T/3, the cold flow path:

a second heat exchanger 40-2, a second four-way pipe 30-2, a third electromagnetic valve 20-3, a second magnetic cold accumulator, a fourth electromagnetic valve 20-4, a fourth four-way pipe 30-4 and the second heat exchanger 40-2.

The heat flow path is illustrated in fig. 4, which illustrates the heat flow path.

In the time range of 2T/3T, the cold flow path:

A second heat exchanger 40-2, a second four-way pipe 30-2, a first electromagnetic valve 20-1, a third magnetic cold accumulator, a second electromagnetic valve 20-2, a fourth four-way pipe 30-4 and a second heat exchanger 40-2.

The heat flow path is illustrated in fig. 5, which illustrates the heat flow path.

By controlling the phase difference and the cold and hot flow time, the refrigeration system can realize the stable refrigeration of the refrigeration system, the same magnetic refrigeration system realizes the larger temperature span refrigeration,

Has the advantages that:

The refrigeration system and the control method thereof can realize stable refrigeration of the refrigeration system, and the same magnetic refrigeration structure realizes larger temperature span refrigeration. The preferred scheme of the invention adopts a parallel connection mode of 3 basic flow paths, wherein after being connected in parallel, the magnetic regenerator respectively forms a loop through a four-way pipe, a heat dissipation end H and a refrigeration end C, and the four-way pipe controls the switching among different basic flow paths, 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 the present disclosure is not limited to the precise arrangements, instrumentalities, or instrumentalities 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.