CN109442796A - Magnetic refrigerator packed bed - Google Patents
Magnetic refrigerator packed bed Download PDFInfo
- Publication number
- CN109442796A CN109442796A CN201811108267.7A CN201811108267A CN109442796A CN 109442796 A CN109442796 A CN 109442796A CN 201811108267 A CN201811108267 A CN 201811108267A CN 109442796 A CN109442796 A CN 109442796A
- Authority
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- China
- Prior art keywords
- packed bed
- shell
- magnetic
- bed shell
- magnetic refrigerator
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000000758 substrate Substances 0.000 claims description 36
- 230000000694 effects Effects 0.000 claims description 4
- 230000000712 assembly Effects 0.000 claims 1
- 238000000429 assembly Methods 0.000 claims 1
- 238000005096 rolling process Methods 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 24
- 239000000696 magnetic material Substances 0.000 abstract description 5
- 238000012545 processing Methods 0.000 abstract description 2
- 239000012530 fluid Substances 0.000 description 14
- 238000005057 refrigeration Methods 0.000 description 9
- 238000013461 design Methods 0.000 description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000006641 stabilisation Effects 0.000 description 4
- 238000011105 stabilization Methods 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 230000001788 irregular Effects 0.000 description 2
- 238000011068 loading method Methods 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 239000003507 refrigerant Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 229910000676 Si alloy Inorganic materials 0.000 description 1
- 229910008310 Si—Ge Inorganic materials 0.000 description 1
- WYTGDNHDOZPMIW-RCBQFDQVSA-N alstonine Natural products C1=CC2=C3C=CC=CC3=NC2=C2N1C[C@H]1[C@H](C)OC=C(C(=O)OC)[C@H]1C2 WYTGDNHDOZPMIW-RCBQFDQVSA-N 0.000 description 1
- 238000010009 beating Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000005347 demagnetization Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000002887 superconductor Substances 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- 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
-
- 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]
Landscapes
- 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)
- Refrigerator Housings (AREA)
Abstract
The invention belongs to magnetic refrigerating fields, and in particular to arrive a kind of raising temperature span and heat exchange efficiency, and the magnetic refrigerating material of easy processing fills bed structure.Including packed bed shell and small filling member, packed bed shell is tubular structure, at least two or more effective chambers parallel to each other of packed bed shell, at least one turn-around chamber of packed bed shell, packed bed shell one end is first port, the packed bed shell other end is second port, and small filling member is arranged in effective chamber.The present invention can effectively increase temperature across, while be suitable for powdered magnetic material.
Description
Technical field
The invention belongs to magnetic refrigerating fields, and in particular to arrive a kind of raising temperature span and heat exchange efficiency, and easy processing
Magnetic refrigerating material fills bed structure.
Background technique
Room temperature magnetic refrigerating technology has the characteristics that environmentally protective, energy-efficient, reliable and stable, has caused generation in recent years
The extensive concern of boundary's range.Social 15% or more always to consume energy is accounted for since refrigeration industry consumes energy, at present the machinery of conventional compression mechanism cold
Components and refrigerant rise in price, and the meeting welding system of gas refrigerant used in vapor compression refrigeration, so
The advantages of room-temperature magnetic refrigerator has this technology be expected to part to substitute traditional vapor compression refrigeration.Such as: Gd-Si-
The compounds such as 13 based compound of Ge, LaCaMnO3, Ni-Mn-Ga, La (Fe, Si), Mn-Fe-P-As, MnAs.These novel huge magnetic
The common feature of fuel factor material is that magnetic entropy change is above traditional room temperature magnetic refrigerating material Gd, and phase transition property is level-one, and more
Number is presented strong magnetocrystalline coupling characteristics, magnetic phase transition with significant crystal structure phase transformation generation.These new materials also table
Reveal different material properties, for example, Gd-Si-Ge is expensive, needs further to purify raw material in preparation process, Mn-
The compound starting materials such as Fe-P-As, MnAs are toxic etc..
The research and application of room-temperature magnetic refrigerator are also constantly improving.Room-temperature magnetic refrigerator use at first electromagnet or
Person's superconductor makees magnetic field, but superconduction and electromagnet are expensive, and maintenance cost is high, and commercialization is restricted.Current room temperature
The magnetic field of room-temperature magnetic refrigerator is provided by permanent magnet, while realizing downfield, high-power, high-frequency.
With the development of room-temperature magnetic refrigerator, it is believed that a variety of Curie-point temperatures should be used from height in magnetic refrigerating material
It is sequentially arranged in packed bed on earth, formation temperature gradient, high-Curie-point magnetic refrigerating material one end is connected with hot end heat exchanger, low
Curie point magnetic refrigerating material one end is connected with cold end.These magnetic refrigerating materials include LaFeSi system alloy, Gd system alloy, Mn-Fe-
P-Si alloy etc..The shape of alloy can be spheric granules, irregular particle, parallel lamellar, filament shape, in block with flat
Row hole and block with irregular hole.
In magnetic refrigerator, cold-storage bed is also referred to as packed bed, is generally used for being centrally placed for magnetic working medium, in magnetic working medium excitation
During demagnetization, need heat transferring medium carry out heat exchange, such as Chinese patent application publication No.: 103822412 A of CN in
A kind of active regenerator for room-temperature magnetic refrigerator disclosed on May 28th, 2014, including insulated case and setting exist
The intracorporal magnetic of insulated shell hot working medium bed is linearly evenly arranged with phase in the hot working medium bed of the magnetic along its length
Mutual fine channel parallel, for flowing through heat exchanging fluid.The magnetic working medium of powdery can not be put into wherein by this scheme, and powder can be with
Heat exchanging fluid flowing flow out packed bed, outflow refrigeration packed bed, also mean that the effective range for having left magnetic field, in this way
Refrigeration can be lost；In addition, will affect beating for valve if powdered magnetic refrigerating material enters in the valve body at packed bed both ends
It opens and is closed, influence the refrigeration effect of integral refrigerating system.
Summary of the invention
The present invention is intended to provide it is a kind of effectively increase temperature across, suitable for powdered magnetic material magnetic refrigerator filling
Bed, including packed bed shell and small filling member, the packed bed shell are tubular structure, at least two, packed bed shell with
Upper effective chamber parallel to each other, at least one turn-around chamber of packed bed shell, packed bed shell one end are first port, packed bed
The shell other end is second port, and the small filling member is arranged in effective chamber.Packed bed shell passes through for heat exchanging fluid
And the fixation of small filling member.Packed bed shelling machine can place more kinds of residences at meander-shaped repeatedly according to actual needs
In the magnetic refrigerating material put, can effectively increase in this way temperature across；Every kind of material can also be improved when not changing material category
Loadings so that the volume that effective heat exchanging fluid flows through magnetic refrigerating material surface increases, refrigerating capacity is improved, and can be improved in this way
The refrigerating efficiency of refrigeration machine.In order to reduce the waste in gapped magnetic field space, curved cavity is accomplished compact as far as possible.Small filling member
It is hollow, wherein there is the powdered magnetic material being filled under protective gas (such as nitrogen) environment, guarantee the powder in small filling member
Last shape magnetic material undergoes no deterioration failure.After the installation is completed, heat exchanging fluid enters from first port, with small filling member outer surface
It is flowed out after coming into full contact with from second port and completes heat exchange work.The small cavity of magnetic refrigerating material can also be placed in turn-around chamber, in this way
Internal heat exchanging fluid temperature is exactly gradient distribution, can increase refrigeration effect, make full use of magnetic field.
Preferably, being additionally provided with gusset in the packed bed shell, gusset is for fixing small filling member in effective chamber
In position.Gusset can guarantee that the position relative to packed bed shell will not occur under the impact of heat exchanging fluid for small filling member
Variation.
Described preferably, if the gusset includes stem substrate, guide post and several mounting holes being disposed on the substrate
If stem substrate joins end to end, it is rotatablely connected between substrate, guide post setting is provided in substrate rotating junction, packed bed shell
With the guide groove of guide post cooperation.It, can be when in use by guide post along guiding if gusset is composed by stem substrate is end to end
Slot is inserted into packed bed shell, and relationship when passing through turn-around chamber between substrate due to rotation connection can produce that there are enough angles
Degree is turned to.There are also deepen to lead in most of position of effective chamber by raising the height of guide groove two sides in the design
To slot, so that substrate lower end carries out in linear motion in effective chamber also by the limit of guide groove, to guarantee that substrate exists
It can holding position stabilization after installing and being installed；And substrate enters turn-around chamber when being turned to, guide groove two sides
Height reduces, and does not limit to substrate lower end, so that making can be redirected between substrate with biggish angle next has
Chamber is imitated, radius required for effective chamber is effectively reduced.This substrate push-in type design, which can allow packed bed shell to reduce, to be needed
The part to be welded, to guarantee its leakproofness.
Preferably, packed bed outer casing inner wall upper surface is additionally provided with the gutter with guide post cooperation.Guide groove and stabilization
Guide post is limited on pre-determined route by slot jointly, and substrate caused by preventing guide post from swinging is swung.
Preferably, staggered on substrate above and below the mounting hole.Mounting hole is staggered and can increase up and down
The active area of heat exchanging fluid.
Preferably, the guide post both ends are additionally provided with ball.Guide post and guiding when ball is for reducing substrate installation
The friction that slot generates.
Preferably, the small filling member shape is cylindroid.The major diameter direction of magnetic direction vertical ellipse.
Preferably, being additionally provided with flow-disturbing protrusion on the mounting hole.Flow-disturbing protrusion is for preventing heat exchanging fluid to peace
It fills hole and generates impact erosion, increase the service life of mounting hole.
Preferably, the packed bed shell radial section is rectangle.
In conclusion the present invention has the advantage that effectively increasing temperature across suitable for powdery magnetic substance material by serpentine design
Material.
Detailed description of the invention
Fig. 1 is top view cross section structural schematic diagram of the invention；
Fig. 2 is perspective cross section structural schematic diagram of the invention；
Fig. 3 is the structural schematic diagram of gusset of the invention；
Fig. 4 is the axial cross section structural schematic diagram of turn-around chamber and effective chamber intersection in the present invention.
Illustrate: 1- packed bed shell, the small filling member of 2-, 3- first port, 4- second port, the effective chamber of 5-, 6- turn
To chamber, 7- gusset, 8- substrate, 9- guide post, 10- mounting hole, 11- guide groove, 12- flow-disturbing protrusion, 13- ball.
Specific embodiment
Below with reference to the embodiments and with reference to the accompanying drawing the technical solutions of the present invention will be further described.
Embodiment 1: such as Fig. 1, shown in 2,3,4, a kind of magnetic refrigerator packed bed, including packed bed shell 1 and small filling
Part 2, packed bed shell are tubular structure, at least two or more effective chambers 5 parallel to each other of packed bed shell, packed bed shell
At least one turn-around chamber 6, packed bed shell one end are first port 3, and the packed bed shell other end is second port 4, small to fill out
Part is filled to be arranged in effective chamber.Gusset 7 is additionally provided in packed bed shell, gusset is for fixing small filling member in effective chamber
Position.If gusset includes stem substrate 8, guide post 9 and several mounting holes 10 being disposed on the substrate, if stem substrate joins end to end, base
It is rotatablely connected between plate, guide post setting is provided with the guide groove with guide post cooperation in substrate rotating junction, packed bed shell
11.It is staggered on substrate above and below mounting hole.Guide post both ends are additionally provided with ball 13.Small filling member shape is elliptical cylinder-shape.
Flow-disturbing protrusion 12 is additionally provided on mounting hole.Packed bed shell section is rectangle.
Packed bed shell passes through for heat exchanging fluid and the fixation of small filling member.Packed bed shelling machine is at repeatedly tortuous
Shape, can place the magnetic refrigerating material of more kinds of curie points according to actual needs, can effectively increase in this way temperature across；It can also be
In the case of not changing material category, the loadings of every kind of material are improved, so that effective heat exchanging fluid flows through magnetic refrigerating material table
The volume in face increases, and refrigerating capacity improves, and the refrigerating efficiency of refrigeration machine can be improved in this way.In order to reduce the wave in gapped magnetic field space
Take, curved cavity is accomplished compact as far as possible.Small filling member is hollow, wherein there is the powdered magnetic substance material being filled in a nitrogen environment
Material guarantees that the powdered magnetic material in small filling member undergoes no deterioration failure.Gusset can guarantee that small filling member will not exchange heat
The change in location relative to packed bed shell occurs under the impact of fluid.If gusset is composed by stem substrate is end to end,
It can be when in use by guide post along guide groove insertion packed bed shell, due to rotation connection between substrate when passing through turn-around chamber
Relationship can produce that there are enough angles to be turned to.There are also deepen guiding in most of position of effective chamber in the design
Slot so that substrate lower end in linear motion also by the limit of guide groove, to guarantee that substrate is being installed and installed
It can holding position stabilization after.This substrate push-in type design can allow packed bed shell to reduce the part for needing to weld, from
And guarantee its leakproofness.Mounting hole is staggered up and down can increase the active area of heat exchanging fluid.Ball is for reducing substrate
The friction that guide post and guide groove generate when installation.Flow-disturbing protrusion increases for preventing heat exchanging fluid from generating impact erosion to mounting hole
Add the service life of mounting hole.In the design there are also in most of position of effective chamber by raising the height of guide groove two sides
Deepen guide groove, so that substrate lower end carries out in linear motion in effective chamber also by the limit of guide groove, to protect
Demonstrate,proving substrate can holding position stabilization after installing and being installed；And substrate is when entering turn-around chamber and being turned to, guiding
The height of slot two sides reduces, and does not limit to substrate lower end, to make to be redirected between substrate with biggish angle
Next effective chamber, is effectively reduced radius required for effective chamber.
It should be understood that being somebody's turn to do, examples are only for illustrating the present invention and not for limiting the scope of the present invention.In addition, it should also be understood that,
After having read the content of the invention lectured, those skilled in the art can make various modifications or changes to the present invention, these etc.
Valence form is also fallen within the scope of the appended claims of the present application.
Claims (8)
1. a kind of magnetic refrigerator packed bed, which is characterized in that including avoiding the packed bed shell of magnetic field shielding effect and avoiding
The small filling member of magnetic field shielding effect, the packed bed shell are tubular structure, at least two or more, packed bed shell
Effective chamber, at least one turn-around chamber of packed bed shell, packed bed shell one end are first port, and the packed bed shell other end is
Second port, the small filling member are arranged in effective chamber.
2. magnetic refrigerator packed bed according to claim 1, which is characterized in that also set up in the packed bed shell
There is gusset, gusset is for fixing position of the small filling member in effective chamber.
3. magnetic refrigerator packed bed according to claim 2, which is characterized in that the gusset is by several column assemblies
It is spliced, is disposed on the substrate in column assembly including guide post and two pieces of substrates being rotatably connected on guide post, mounting hole, filled
The guide groove with guide post cooperation is provided in bed shell.
4. magnetic refrigerator packed bed according to claim 3, which is characterized in that staggered above and below the mounting hole
On substrate.
5. magnetic refrigerator packed bed according to claim 3, which is characterized in that the guide post both ends are additionally provided with rolling
Pearl.
6. magnetic refrigerator packed bed according to claim 1, which is characterized in that the small filling member shape is ellipse
Column.
7. according to magnetic refrigerator packed bed described in claim 3 or 4 or 5, which is characterized in that also set on the mounting hole
It is equipped with flow-disturbing protrusion.
8. magnetic refrigerator packed bed according to claim 1 or 2 or 3 or 4 or 5 or 6, which is characterized in that described fills out
Filling a shell radial section is rectangle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811108267.7A CN109442796B (en) | 2018-09-21 | 2018-09-21 | Packed bed for magnetic refrigerator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811108267.7A CN109442796B (en) | 2018-09-21 | 2018-09-21 | Packed bed for magnetic refrigerator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109442796A true CN109442796A (en) | 2019-03-08 |
| CN109442796B CN109442796B (en) | 2020-06-09 |
Family
ID=65532638
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811108267.7A Active CN109442796B (en) | 2018-09-21 | 2018-09-21 | Packed bed for magnetic refrigerator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109442796B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110864471A (en) * | 2019-11-27 | 2020-03-06 | 横店集团东磁股份有限公司 | Magnetic refrigeration device with transmission power, method and application |
| CN110994067A (en) * | 2019-11-28 | 2020-04-10 | 横店集团东磁股份有限公司 | Lithium ion battery cooling system |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5091361A (en) * | 1990-07-03 | 1992-02-25 | Hed Aharon Z | Magnetic heat pumps using the inverse magnetocaloric effect |
| US20020034381A1 (en) * | 2000-09-16 | 2002-03-21 | Chin-Kuang Luo | Fluid conduit with enhanced thermal conducting ability |
| CN1392381A (en) * | 2001-06-16 | 2003-01-22 | 李红导 | Field refrigeration technology |
| CN103782116A (en) * | 2011-09-14 | 2014-05-07 | 日产自动车株式会社 | Magnetic structure and magnetic cooling and heating device using same |
| JP2016003836A (en) * | 2014-06-18 | 2016-01-12 | 株式会社デンソー | Magnetic structure, heat exchanger, and refrigeration cycle system |
| JP2016044902A (en) * | 2014-08-25 | 2016-04-04 | 株式会社フジクラ | Magnetic working substance structure for magnetic refrigeration machine |
-
2018
- 2018-09-21 CN CN201811108267.7A patent/CN109442796B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5091361A (en) * | 1990-07-03 | 1992-02-25 | Hed Aharon Z | Magnetic heat pumps using the inverse magnetocaloric effect |
| US20020034381A1 (en) * | 2000-09-16 | 2002-03-21 | Chin-Kuang Luo | Fluid conduit with enhanced thermal conducting ability |
| CN1392381A (en) * | 2001-06-16 | 2003-01-22 | 李红导 | Field refrigeration technology |
| CN103782116A (en) * | 2011-09-14 | 2014-05-07 | 日产自动车株式会社 | Magnetic structure and magnetic cooling and heating device using same |
| JP2016003836A (en) * | 2014-06-18 | 2016-01-12 | 株式会社デンソー | Magnetic structure, heat exchanger, and refrigeration cycle system |
| JP2016044902A (en) * | 2014-08-25 | 2016-04-04 | 株式会社フジクラ | Magnetic working substance structure for magnetic refrigeration machine |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110864471A (en) * | 2019-11-27 | 2020-03-06 | 横店集团东磁股份有限公司 | Magnetic refrigeration device with transmission power, method and application |
| CN110864471B (en) * | 2019-11-27 | 2021-06-08 | 横店集团东磁股份有限公司 | Magnetic refrigeration device with transmission power, method and application |
| CN110994067A (en) * | 2019-11-28 | 2020-04-10 | 横店集团东磁股份有限公司 | Lithium ion battery cooling system |
| CN110994067B (en) * | 2019-11-28 | 2021-11-12 | 横店集团东磁股份有限公司 | Lithium ion battery cooling system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109442796B (en) | 2020-06-09 |
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| EE01 | Entry into force of recordation of patent licensing contract |
Application publication date: 20190308 Assignee: Jinhua cimeng Intellectual Property Service Co.,Ltd. Assignor: HENGDIAN GROUP DMEGC MAGNETICS Co.,Ltd. Contract record no.: X2023330000883 Denomination of invention: Filling bed for magnetic refrigeration machines Granted publication date: 20200609 License type: Common License Record date: 20231128 |
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