CN109780751A - A kind of magnetic refrigerating system - Google Patents
A kind of magnetic refrigerating system Download PDFInfo
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- CN109780751A CN109780751A CN201811582828.7A CN201811582828A CN109780751A CN 109780751 A CN109780751 A CN 109780751A CN 201811582828 A CN201811582828 A CN 201811582828A CN 109780751 A CN109780751 A CN 109780751A
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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
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- 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 present invention provides a kind of magnetic refrigerating system comprising: N number of basis flow path；And the phase difference of two neighboring basic flow path is T/ (2N) in N number of basic flow path, and in each basic flow path plus meets relational expression t1:t2=1:(N-1 between magnetic time t1 and Exotherm Time t2)；Or the phase difference of two neighboring basic flow path is T/ (2m) in N number of basic flow path, wherein N=n*m；And in each basic flow path plus meet relational expression t1:t2=1:(m-1 between magnetic time t1 and Exotherm Time t2).The summation for being added the flow in a certain period of time of N number of basic flow path is steady state value, and the flow of system is constant, and motor load is constant, and the cold and hot amount provided simultaneously tends to be continuous and stablizes.
Description
Technical field
The invention belongs to magnetic refrigeration technology fields, and in particular to a kind of magnetic refrigerating system.
Background technique
As environmental problem has been to be concerned by more and more people, ozone layer of traditional steam compression type refrigeration due to generation
The environmental problems such as destruction, greenhouse effects, thus it is badly in need of a kind of New Refrigerating technology of environmental protection and energy saving.Magnetic Refrigeration Technique is a kind of base
In the New Refrigerating technology of magnetothermal effect, and magnetothermal effect refers to magneto-caloric material in magnetic field-enhanced or heat release or heat absorption when weakening
Physical phenomenon.When magnetic field adds magnetic to magneto-caloric material, magneto-caloric material heating；When removing magnetic field, magneto-caloric material turns cold.Magnetic freezes just
It is the purpose that refrigeration may be implemented using the phenomenon that magnetothermal effect.
Magnetic refrigeration cycle includes adding magnetic, 4 heat flow, degaussing and cold flow processes.Wherein magnetic Brayton cycle is by two
Equal fields (BC and DA) and two insulation (AB and CD) processes, as shown in Figure 1.Process: adiabatic magnetization (AB) → wait magnetic fields heat release
(BC) (external magnetic field remains unchanged, temperature decline) → adiabatic demagnetization (CD) → waiting magnetic fields heat absorption (DA), (external magnetic field remains unchanged, temperature
Degree rises).Adiabatic magnetization process and the exchange of adiabatic demagnetization procedure empty calory.Therefore, it when adiabatic magnetization/demagnetization process, stores
Cold bed passes through without fluid.When equal fields exothermic/endothermic, fluid, which just flows through cold-storage bed, takes away heat/cold.That is plus magnetic and
Flow system flow is 0 in demagnetization process, heat/cold is taken away by fluid during heat flow and cold flow, flow system flow
It is not 0, material is thus formed the discontinuous adjustable systems of flow.For adjustable systems, since flow is discontinuous,
Cause system load (pump and motor load) non-constant, the wasted work of pump and motor increases, while the cold and hot amount provided is also discontinuous.
Since that there are flows is discontinuous for magnetic refrigerating system in the prior art, lead to system load (pump and motor load) no
The cold and hot amount also technical problems such as discontinuous, therefore researching and designing of the present invention constant, that the wasted work of pump and motor increases, while providing
A kind of magnetic refrigerating system out.
Summary of the invention
Therefore, the technical problem to be solved in the present invention is that overcoming magnetic refrigerating system in the prior art, there are flows not to connect
It is continuous, cause system load (pump and motor load) non-constant, the defect that the wasted work of pump and motor increases, to provide a kind of magnetic system
Cooling system.
The present invention provides a kind of magnetic refrigerating system comprising:
N number of basis flow path, wherein it includes a circuit of at least two groups cold-storage bed that the elementary streams road, which is, and this two groups of storages
The working condition of cold bed on the contrary, when i.e. one group of cold-storage bed adds magnetic, another group of cold-storage bed degaussing or one group of cold-storage bed heat flow
When, another group of cold-storage bed then carry out cold flow, wherein N be natural number；
And the phase difference of two neighboring basic flow path is T/ (2N) in N number of basic flow path, and is insulated in each basic flow path
Magnetizing time t1 and wait meet relational expression t1:t2=1:(N-1 between the Exotherm Time t2 of magnetic fields)；Or phase in N number of basic flow path
The phase difference of adjacent two basic flow paths is T/ (2m), and wherein N=m*n and m, n are natural number, and in each basic flow path absolutely
Thermomagnetization time t1 and wait meet relational expression t1:t2=1:(m-1 between the Exotherm Time t2 of magnetic fields).
Preferably,
It is each basis flow path cycle period be T, comprising: adiabatic magnetization time t1, etc. magnetic fields Exotherm Time t2, insulation
Absorb heat time t4, T=t1+t2+t3+t4 for demagnetization process time t3 and equal magnetic fields, and has t1=t3, t2=t4.
Preferably,
And t1+t2=T/2, t3+t4=T/2.
Preferably,
When N is the prime number greater than 1:
The phase difference of N number of basis flow path is T/ (2N), and the adiabatic magnetization time t1 in each basis flow path and equal magnetic fields are put
Relational expression t1:t2=1:(N-1 is all satisfied between hot time t2).
Preferably,
When N is the conjunction number greater than 1:
The phase difference of N number of basis flow path is T/ (2N), and the adiabatic magnetization time t1 in each basis flow path and equal magnetic fields are put
Relational expression t1:t2=1:(N-1 is all satisfied between hot time t2).
Preferably,
When N is the conjunction number greater than 1:
N number of basic flow path is divided into n group, in each group includes the knot between m basic flow path and the basic flow path of n group
Structure and rate-determining steps are all the same, N=m*n, and the phase difference of two neighboring basic flow path is T/ in m basic flow path in every group
(2m), and adiabatic magnetization time t1 in each basic flow path and wait and be all satisfied relational expression t1:t2 between the Exotherm Time t2 of magnetic fields
=1:(m-1).
Preferably,
The phase difference of every two adjacent foundation flow path is T/ (2m) in m basic flow path in every group.
Preferably,
The heat exchanging fluid of N number of basis flow path is pumped by same pump.
Preferably,
It is connected in parallel between N number of basis flow path.
Preferably,
Pumping out for the pump be connected between end and N number of basic flow path by current divider, the reflux end of the pump with it is N number of
It is connected between the basis flow path by junction station.
A kind of magnetic refrigerating system provided by the invention has the following beneficial effects:
Magnetic refrigerating system of the invention will be arranged to and the number according to basic flow path between adjacent basic flow path
Successively there is specified phase difference, and the ratio for adiabatic magnetization the time t1 and Exotherm Time t2 being arranged in each flow path, i.e.,
It can adjust and add magnetic/degaussing and heat flow/cold flow time, so that carrying out adding magnetic or degaussing in wherein one basic flow path
When, other basic flow path in the fluid flowing for carrying out heat release or heat absorption, similarly a certain flow path in other basic flow paths exists
Carry out plus magnetic or when degaussing, basic flow path in addition in the fluid flowing for carrying out heat release or heat absorption so that N number of basic flow path
The summation that is added of flow in a certain period of time be steady state value, can effectively solve the problem that existing magnetic refrigerating system add magnetic/
Pump and the pump discharge of motor are non-constant when degaussing/exothermic/endothermic, cause that motor load is non-constant and electric efficiency is low, energy consumption
High technical problem, so that the flow of system is constant, motor load is constant, and the cold and hot amount provided simultaneously tends to be continuous and steady
It is fixed, it is more energy saving compared with the suddenly big or suddenly small adjustment type system of flow.
Detailed description of the invention
Fig. 1 is the magnetic Brayton cycle schematic diagram in magnetic refrigerating system one basic flow path of the invention；
Fig. 2 is the flow period figure that single cold-storage bed is flowed through in magnetic refrigerating system one basic flow path of the invention；
Fig. 3 is the structural schematic diagram for the basic flow path being driven by pump in magnetic refrigerating system of the invention；
Fig. 4 is the structural schematic diagram of the basic flow path in magnetic refrigerating system of the invention by piston driving.
Appended drawing reference indicates in figure are as follows:
1, cold-storage bed a；2, magnet；3, cold-storage bed b；4, cool end heat exchanger；5, hot end heat exchanger；6, hot into valve；7, heat goes out
Valve；8, cold into valve；9, cold valve out；10, it pumps；11, piston；12, check valve.
Specific embodiment
As shown in Figs 1-4, the present invention provides a kind of magnetic refrigerating system comprising:
It is N number of basis flow path, wherein the elementary streams road be include at least two groups cold-storage bed a circuit (such as the institute of Fig. 3 or 4
Show, be a basic flow path, the structure of multiple basis flow paths is not shown, i.e., carries out on the basis of a basic flow path in parallel
Or other connection types), and this two groups of cold-storage beds working condition on the contrary, when i.e. one group of cold-storage bed adds magnetic, another group of cold-storage bed
When degaussing or one group of cold-storage bed heat flow, another group of cold-storage bed then carry out cold flow, wherein N be natural number；
And the phase difference of two neighboring basic flow path is T/ (2N) in N number of basic flow path, and adds magnetic in each basic flow path
Meet relational expression t1:t2=1:(N- between time t1 (i.e. adiabatic magnetization time) and equal magnetic fields heat release (i.e. heat flow) time t2
1)；Or the phase difference of two neighboring basic flow path is T/ (2m) in N number of basic flow path, wherein N=m*n and m, n are nature
Number, and meet relational expression t1 between adiabatic magnetization time t1 and equal magnetic fields heat release (heat flow) time t2 in each basis flow path:
T2=1:(m-1).
Magnetic refrigerating system of the invention will be arranged to and the number according to basic flow path between adjacent basic flow path
Successively there is specified phase difference, and the ratio for adiabatic magnetization the time t1 and Exotherm Time t2 being arranged in each flow path, i.e.,
It adjusts and adds magnetic/degaussing and heat flow/cold flow time, so that when add magnetic or degaussing in wherein one basic flow path,
Other basis flow paths are in the fluid flowing for carrying out heat release or heat absorption, and similarly a certain flow path in other basic flow paths is carrying out
When adding magnetic or degaussing, basic flow path in addition in the fluid flowing for carrying out heat release or heat absorption so that N number of basis flow path
The summation that flow in certain time period is added is steady state value, can effectively solve the problem that existing magnetic refrigerating system is adding magnetic/degaussing/to put
When heat/heat absorption pump with the pump discharge of motor it is non-constant, cause the technology that motor load is non-constant and electric efficiency is low, energy consumption is high
Problem, so that the flow of system is constant, motor load is constant, and the cold and hot amount provided simultaneously tends to be continuous and stablizes, with flow
Suddenly big or suddenly small adjustment type system is compared to more energy saving.
That is the present invention provides in a kind of hot equipment of magnetic plus the determination method of magnetic/degaussing and cold and hot flowing time ratio, makes system
In the cyclic process of single basic flow path belong to the variable adjustment type system of flow, it is whole but by the superposition of multiple basis flow paths
A true flow of system is constant.
Preferably,
It is each basis flow path cycle period be T, comprising: adiabatic magnetization time t1, etc. magnetic fields Exotherm Time t2, insulation
Absorb heat (cold flow) time t4, T=t1+t2+t3+t4 for demagnetization process time t3 and equal magnetic fields, and has t1=t3, t2=t4.Into
One step preferably, and t1+t2=T/2, t3+t4=T/2.
As shown in Figure 1, magnetic refrigerating system of the invention uses magnetic Brayton cycle, and the magnetic Brayton cycle period is T,
The middle adiabatic magnetization time is t1, and waiting magnetic fields heat release (heat flow) time is t2, and adiabatic demagnetization process time is t3, and magnetic fields is waited to absorb heat
(cold flow) time is t4.And t1+t2=T/2, t1=t3, t2=t4.
Basic flow path in the hot equipment of magnetic is the loop (such as Fig. 3 or 4) including at least two groups of cold-storage beds.Every group of cold-storage
The quantity of bed is greater than 1, has heat transport fluid to pass through in cold-storage bed, and heat transport fluid is driven by pump or piston.When operation, this two groups of cold-storages
The working condition of bed is just the opposite: when i.e. one group of cold-storage bed adds magnetic, another group of cold-storage bed degaussing or one group of cold-storage bed carry out heat
When flowing, another group of cold-storage bed then carries out cold flow.The flow direction of heat transport fluid heat flow and cold flow in cold-storage bed on the contrary,
Flow is equal, and the cycle period of each cold-storage bed is T.
Preferably,
When N is the prime number greater than 1:
The phase difference of N number of basis flow path is T/ (2N), and the adiabatic magnetization time t1 in each basis flow path and equal magnetic fields are put
Relational expression t1:t2=1:(N-1 is all satisfied between heat (heat flow) time t2), flow system flow is constant at this time.
This is the number of N number of basic flow path of the invention when being the prime number greater than 1, realizes the constant preferred control of pump discharge
Mode (the first arragement construction form can be realized being constant all the time for multiple basic flow path total flows) processed, i.e., N number of basic flow path
In there is phase difference T/ (2N) successively, and the adiabatic magnetization time t1 in each basic flow path between two neighboring basic flow path
Relational expression t1:t2=1:(N-1 is all satisfied between equal magnetic fields heat release (heat flow) time t2) so that a basic flow path is adding
When magnetic or the heat exchanging fluid of degaussing do not flow, there are the flowings of heat exchanging fluid in other basic flow paths, and change in basic flow path in N
The total flow of hot fluid flowing is constant.
1. the hot equipment of magnetic shares 4 cold-storage beds (i.e. 2 basic flow paths), single basis flow path knot as shown in following table (table 1)
Structure such as Fig. 3 or Fig. 4, therefore the hot equipment of magnetic shares 2 basic flow paths.
It is arranged to the phase difference of adjacent two basic flow paths in 2 basic flow paths to be followed successively by T/4, and t1:t2=1:1, from
And make entire magnetic refrigerating system all there is bed at any one time and adding magnetic, a bed is in degaussing, and 1 bed is in heat flow, and 1
A bed is in cold flow.If flow when carrying out heat flow and cold flow in basic flow path is a, then systems constant flow is a.One
Two cold-storage beds in basic flow path indicate with serial number a, b respectively, each working condition such as table 1 in 2 basic flow paths:
The working condition of each cold-storage bed in the system of 1:2, table basic flow path
Preferably,
When N is the conjunction number greater than 1:
The phase difference of N number of basis flow path is T/ (2N), and the adiabatic magnetization time t1 in each basis flow path and equal magnetic fields are put
Relational expression t1:t2=1:(N-1 is all satisfied between heat (heat flow) time t2), flow system flow is constant at this time.
This is the number of N number of basic flow path of the invention when being the conjunction number greater than 1, realizes the constant preferred control of pump discharge
Mode (second of arragement construction form can be realized being constant all the time for multiple basic flow path total flows) processed, i.e., N number of basic flow path
In there is phase difference T/ (2N) successively, and the adiabatic magnetization time t1 in each basic flow path between two neighboring basic flow path
Relational expression t1:t2=1:(N-1 is all satisfied between equal magnetic fields heat release (heat flow) time t2) (with the first arrangement phase
Together, referring to table 2) so that a basic flow path is when adding the heat exchanging fluid of magnetic or degaussing not flow, exists in other basic flow paths
The flowing of heat exchanging fluid, and the total flow of heat exchanging fluid flowing is constant in basic flow path in N.
As shown in (table 2), the hot equipment of magnetic shares 12 cold-storage beds (i.e. 6 basic flow paths), and single basis flow passage structure is such as
Fig. 3 or Fig. 4, therefore the hot equipment of magnetic shares 6 basic flow paths.
It is arranged to the phase difference of adjacent two basic flow paths in 6 basic flow paths to be followed successively by T/6, and t1:t2=1:5, from
And make entire magnetic refrigerating system all there is bed at any one time and adding magnetic, a bed is in degaussing, and 5 beds are in heat flow, and 5
A bed is in cold flow.If flow when carrying out heat flow and cold flow in basic flow path is 5a, then systems constant flow is 5a.One
Two cold-storage beds in a basis flow path indicate with serial number a, b respectively, each working condition such as table 2 in 2 basic flow paths.
The working condition 1 of each cold-storage bed in the system of 2:6, table basic flow path
Preferably,
When N is the conjunction number greater than 1:
N number of basic flow path is divided into n group, in each group includes the knot between m basic flow path and the basic flow path of n group
Structure and rate-determining steps are all the same, N=m*n, and the phase difference of two neighboring basic flow path is T/ in m basic flow path in every group
(2m) (preferably the phase difference of every two adjacent foundation flow path is T/ (2m)), and the adiabatic magnetization time in each basic flow path
Relational expression t1:t2=1:(m-1 is all satisfied between t1 and equal magnetic fields heat release (heat flow) time t2), flow system flow is constant at this time.
This is the number of N number of basic flow path of the invention when being the conjunction number greater than 1, realizes the constant preferred control of pump discharge
Mode (the third arragement construction form can be realized being constant all the time for multiple basic flow path total flows) processed, i.e., by N number of elementary streams
Road can be divided into the mode of the product of two numbers, so that one of number n is group number, the basic flow path organized between number n is complete
Identical, another number m is the elementary streams number in group, and there are the structure of phase difference not similar shapes between the elementary streams number m in group
Formula, and there is phase difference T/ (2m) successively in m basic flow path between two neighboring basic flow path, and each basic flow path
In adiabatic magnetization time t1 and equal magnetic fields heat release (heat flow) time t2 between be all satisfied relational expression t1:t2=1:(m-1), make
A basic flow path when adding the heat exchanging fluid of magnetic or degaussing not flow, there are the streams of heat exchanging fluid in other basic flow paths
It is dynamic, and the total flow of heat exchanging fluid flowing is constant in basic flow path in N.
2. as shown in following table (table 3), 6 basic flow paths are divided into 2 groups (n=2) by N=6, and by 3 (m=3) in every group
The phase difference of basic flow path is set as T/6, and t1:t2=1:2, and system all has two beds at any one time and adding magnetic, and two
Bed is in degaussing, and 4 beds are in heat flow, and 4 beds are in cold flow.If flow when carrying out heat flow and cold flow in basic flow path is
A, then systems constant flow is 4a.Two cold-storage beds in one basic flow path indicate with serial number a, b respectively, 6 basic flow paths
In each working condition be as follows:
The working condition 2 of each cold-storage bed in the system of 3:6, table basic flow path
3. as shown in following table (table 4), 6 basic flow paths are divided into 3 groups (n=3), wherein 2 (m=2) in every group by N=6
The phase difference of basic flow path is followed successively by T/4, and t1:t2=1:1, and system all has 3 beds at any one time and adding magnetic, and 3
Bed is in degaussing, and 3 beds are in heat flow, and 3 beds are in cold flow.If flow when carrying out heat flow and cold flow in basic flow path is
A, then systems constant flow is 3a.Two cold-storage beds in one basic flow path indicate with serial number a, b respectively, 6 basic flow paths
In each working condition be as follows:
The working condition 3 of each cold-storage bed in the system of 4:6, table basic flow path
Preferably,
The heat exchanging fluid of N number of basis flow path is pumped by pump or piston.This be two kinds of magnetic refrigerating system of the invention not
Heat exchanging fluid is pumped to cold-storage bed a, cold-storage bed b and cool end heat exchanger, hot end by pump or piston by same structure type
In heat exchanger, the driving effect of heat exchanging fluid is realized.
Preferably,
It is connected in parallel between N number of basis flow path.This is the preferred connection type of N number of basic flow path of the invention.
Preferably,
Pumping out for the pump be connected between end and N number of basic flow path by current divider, the reflux end of the pump with it is N number of
It is connected between the basis flow path by junction station.After the output end fluid of pump or piston can be shunted by current divider in this way
It reaches in N number of basic flow path and is back to by the heat exchanging fluid in N number of basic flow path after heat exchange and by junction station confluence again
In pump or piston, the present invention is supplied by the constant and stable flow that above-mentioned control method can be realized pump or piston, so that
Pump reaches minimum with motor power consumption, so that whole system is stablized, improves system stability and realizes the continuous heating or system of fluid
It is cold.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.With
It is only the preferred embodiment of the present invention described in upper, it is noted that for those skilled in the art, not
Under the premise of being detached from the technology of the present invention principle, several improvements and modifications can also be made, these improvements and modifications also should be regarded as this
The protection scope of invention.
Claims (10)
1. a kind of magnetic refrigerating system, it is characterised in that: include:
N number of basis flow path, wherein it includes a circuit of at least two groups cold-storage bed that the elementary streams road, which is, and this two groups of cold-storage beds
Working condition on the contrary, when i.e. one group of cold-storage bed adds magnetic, another group of cold-storage bed degaussing or when one group of cold-storage bed heat flow, it is another
One group of cold-storage bed then carries out cold flow, and wherein N is natural number；
And the phase difference of two neighboring basic flow path is T/ (2N) in N number of basic flow path, and adds the magnetic time in each basic flow path
Meet relational expression t1:t2=1:(N-1 between t1 and Exotherm Time t2)；Or two neighboring basic flow path in N number of basic flow path
Phase difference be T/ (2m), wherein N=m*n and m, n are natural number, and in each basic flow path plus magnetic time t1 and heat release
Meet relational expression t1:t2=1:(m-1 between time t2).
2. magnetic refrigerating system according to claim 1, it is characterised in that:
The cycle period of each basis flow path is T, comprising: when adding magnetic time t1, Exotherm Time t2, degaussing time t3 and heat absorption
Between t4, T=t1+t2+t3+t4, and have t1=t3, t2=t4.
3. magnetic refrigerating system according to claim 2, it is characterised in that:
And t1+t2=T/2, t3+t4=T/2.
4. magnetic refrigerating system according to claim 3, it is characterised in that:
When N is the prime number greater than 1:
The phase difference of N number of basis flow path is T/ (2N), adding between magnetic time t1 and Exotherm Time t2 in each basis flow path
Meet relational expression t1:t2=1:(N-1).
5. magnetic refrigerating system according to claim 3, it is characterised in that:
When N is the conjunction number greater than 1:
The phase difference of N number of basis flow path is T/ (2N), adding between magnetic time t1 and Exotherm Time t2 in each basis flow path
Meet relational expression t1:t2=1:(N-1).
6. magnetic refrigerating system according to claim 3, it is characterised in that:
When N is the conjunction number greater than 1:
N number of basic flow path is divided into n group, include in each group structure between m basic flow path and n group basis flow path and
Rate-determining steps are all the same, N=m*n, and the phase difference of two neighboring basic flow path is T/ in m basic flow path in every group
(2m), and adding in each basic flow path, is all satisfied relational expression t1:t2=1:(m-1 between magnetic time t1 and Exotherm Time t2).
7. magnetic refrigerating system according to claim 3, it is characterised in that:
The phase difference of every two adjacent foundation flow path is T/ (2m) in m basic flow path in every group.
8. magnetic refrigerating system described in any one of -7 according to claim 1, it is characterised in that:
The heat exchanging fluid of N number of basis flow path is pumped by same pump or same piston component.
9. magnetic refrigerating system according to claim 8, it is characterised in that:
It is connected in parallel between N number of basis flow path.
10. magnetic refrigerating system according to claim 9, it is characterised in that:
Pumping out for the pump or piston component be connected between end and N number of basic flow path by current divider, the pump or piston
It is connected between the reflux end of component and N number of basic flow path by junction station.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110345681A (en) * | 2019-08-09 | 2019-10-18 | 珠海格力电器股份有限公司 | A kind of regenerator and magnetic refrigerating system and control method |
| CN110953759A (en) * | 2019-11-28 | 2020-04-03 | 珠海格力电器股份有限公司 | Magnetic refrigeration heat exchange system and control method thereof |
| CN110953760A (en) * | 2019-12-05 | 2020-04-03 | 珠海格力电器股份有限公司 | Magnetic refrigeration system |
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| CN110953760A (en) * | 2019-12-05 | 2020-04-03 | 珠海格力电器股份有限公司 | Magnetic refrigeration system |
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