CN108709334B - Electromagnetic field system for magnetic refrigerator - Google Patents
Electromagnetic field system for magnetic refrigerator Download PDFInfo
- Publication number
- CN108709334B CN108709334B CN201810785773.3A CN201810785773A CN108709334B CN 108709334 B CN108709334 B CN 108709334B CN 201810785773 A CN201810785773 A CN 201810785773A CN 108709334 B CN108709334 B CN 108709334B
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- iron core
- magnetic
- electromagnetic coil
- shaped iron
- air gap
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- 230000005672 electromagnetic field Effects 0.000 title claims abstract description 30
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 80
- 238000009434 installation Methods 0.000 claims abstract description 5
- 238000001914 filtration Methods 0.000 claims description 6
- 238000004804 winding Methods 0.000 claims description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 229910000976 Electrical steel Inorganic materials 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 230000004044 response Effects 0.000 abstract description 7
- 230000000737 periodic effect Effects 0.000 abstract description 4
- 238000000034 method Methods 0.000 description 8
- 230000008569 process Effects 0.000 description 8
- 230000000630 rising effect Effects 0.000 description 8
- 238000005057 refrigeration Methods 0.000 description 4
- 239000003990 capacitor Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000004146 energy storage Methods 0.000 description 3
- 230000005611 electricity Effects 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000006467 substitution reaction 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]
Abstract
The invention discloses an electromagnetic field system for a magnetic refrigerator, which comprises an electromagnetic coil, an L-shaped iron core, an upright iron core, a power supply and an installation rack, wherein the electromagnetic coil is arranged on the installation rack; the electromagnetic coil, the L-shaped iron core and the upright post iron core are all arranged on the mounting rack; the L-shaped iron core and the upright iron core are matched to form a C-shaped iron core, an electromagnetic coil is wound on one side of the C-shaped iron core, and a magnetic field is generated after the electromagnetic coil is electrified and used for magnetizing the C-shaped iron core; the power supply is connected with the wiring terminal of the electromagnetic coil to realize direct-current voltage output; an air gap is arranged between the L-shaped iron core and the upright iron core, the width of the air gap can be adjusted, and an active magnetic heat regenerator in the magnetic refrigerator is arranged in the air gap. The invention provides a periodic stable magnetic field for the magnetic working medium and can conveniently adjust the magnetic response characteristic.
Description
Technical Field
The invention relates to the technical field of magnetic refrigeration, in particular to an electromagnetic field system for a magnetic refrigerator.
Background
The magnetic refrigeration is a refrigeration technology with the magnetocaloric effect of solid magnetic materials as the refrigeration principle and has development prospect. In conventional magnetic refrigerator designs, the magnetic field is provided by permanent magnets, the magnetic response characteristics of which are fixed and cannot be changed once the permanent magnets are manufactured and assembled, and the fluid, heat exchange and magnetic response processes of the system are greatly limited in matching and matching debugging and optimization. Unlike permanent magnets, the response characteristics of electromagnetic fields can be flexibly adjusted (e.g., rise and fall times, plateau times and frequencies) over a wide range as desired, providing a powerful means for optimizing system design and performance. However, there is currently no such system, which is an original purpose and purpose of the present invention.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide an electromagnetic field system for a magnetic refrigerator.
The aim of the invention is realized by the following technical scheme: an electromagnetic field system for a magnetic refrigerator comprises an electromagnetic coil, an L-shaped iron core, an upright iron core, a power supply and a mounting rack; the electromagnetic coil, the L-shaped iron core and the upright post iron core are all arranged on the mounting rack; the L-shaped iron core and the upright iron core are matched to form a C-shaped iron core, an electromagnetic coil is wound on one side of the C-shaped iron core, and a magnetic field is generated after the electromagnetic coil is electrified and used for magnetizing the C-shaped iron core; the power supply is connected with the wiring terminal of the electromagnetic coil to realize direct-current voltage output; an air gap is arranged between the L-shaped iron core and the upright iron core, the width of the air gap can be adjusted, and an active magnetic heat regenerator in the magnetic refrigerator is arranged in the air gap.
Further, the L-shaped iron core and the upright iron core are formed in a silicon steel sheet superposition mode.
Furthermore, the electromagnetic coil adopts a multi-strand parallel winding mode, so that the diameter of a used wire can be effectively reduced, and the wire adopts a magnetic soft copper round enameled wire.
Further, the adjusting range of the width of the air gap between the L-shaped iron core and the upright iron core is 0-20 mm.
Further, an air gap between the L-shaped iron core and the upright iron core is adjusted through a lifting screw, the lifting screw is installed on the installation rack and is connected with the upright iron core, and a turntable for rotating the lifting screw enables the lifting screw to move up and down, so that the upright iron core is driven to move up and down in the vertical direction.
Further, the power supply realizes direct-current voltage output through a transformer and a rectifying and filtering circuit, or realizes direct-current voltage output through serial-parallel combination of storage batteries.
Further, the power-on and power-off processes of the electromagnetic coil are realized through the IGBT bridge circuit.
Further, the electromagnetic field system also comprises a control board, wherein the control board is connected with a power supply and used for controlling power supply parameters.
Further, the electromagnetic field system also comprises a Hall sensor, and the current magnetic field intensity of the electromagnetic coil is detected through the Hall sensor.
Further, the electromagnetic field system also comprises a current sensor, the current passing through the electromagnetic coil is detected through the current sensor, hysteresis control is adopted, and the stability of the current intensity is ensured.
The beneficial effects of the invention are as follows: the invention provides a periodic stable magnetic field for the magnetic working medium of the magnetic refrigerator and can conveniently adjust the magnetic response characteristic. The electromagnetic field system can realize that the alternating frequency of current is 0.1-10 Hz, the rising edge and the falling edge of a magnetic field are controllable, meanwhile, the rising time of the magnetic field is small, the current can be changed in a square wave alternating mode between rated current and 0, and meanwhile, the lifting of the upright column iron core can be controlled through the lifting screw rod to control the width of an air gap of the C-shaped iron core, so that the intensity of the magnetic field in the air gap is adjusted.
Drawings
FIG. 1 is a schematic diagram of the overall structure of an electromagnetic field system according to the present invention;
FIG. 2 is a schematic diagram of a power transformer scheme;
FIG. 3 is a schematic diagram of a power battery scheme;
the device comprises a coil, an L-shaped iron core, an upright iron core, a power supply, a control panel, a mounting rack, a lifting screw and a fixing bracket, wherein the coil is arranged at the bottom of the coil, the coil is arranged at the top of the coil, the coil is arranged at the bottom of the coil, and the coil is arranged at the bottom of the coil; 9. the device comprises a transformer 10, a rectifying and filtering device 11, an energy storage capacitor 12, a first IGBT 13, a second IGBT 14, a third IGBT 15 and a fourth IGBT; 16. the device comprises a storage battery pack, 17, an upper IGBT,18, a current sensor, 19, an upper freewheeling diode, 20, a lower IGBT,21 and a lower freewheeling diode.
Detailed Description
The invention will be described in further detail with reference to the drawings and the specific examples.
As shown in fig. 1, the electromagnetic field system for a magnetic refrigerator provided by the invention comprises an electromagnetic coil 1, an L-shaped iron core 2, a column iron core 3, a power supply 4 and a mounting rack 6; the electromagnetic coil 1, the L-shaped iron core 2 and the upright iron core 3 are all arranged on the mounting rack 6; the L-shaped iron core 2 and the upright iron core 3 are matched to form a C-shaped iron core, the electromagnetic coil 1 is wound on one side of the C-shaped iron core, a magnetic field is generated after the electromagnetic coil 1 is electrified, the C-shaped iron core is magnetized by the magnetic field, and magnetic fluxes are converged to form a strengthening magnetic field; the electromagnetic coil 1 adopts a multi-strand parallel winding mode, so that the diameter of a used wire can be effectively reduced, and the wire adopts a magnetic soft copper round enameled wire; the power supply 4 is connected with a wiring terminal of the electromagnetic coil 1 to realize direct-current voltage output; the gap between the L-shaped iron core 2 and the upright iron core 3 is called an air gap, the distance between the upper surface and the lower surface of the air gap is called an air gap width, the air gap width can be adjusted, an active magnetic regenerator in the magnetic refrigerator is arranged in the air gap, and an electromagnetic field system provides a magnetic field for the magnetic refrigerator.
Further, the L-shaped iron core 2 and the upright iron core 3 are formed in a silicon steel sheet superposition mode.
Further, the L-shaped iron core 2 and the column iron core 3 are mounted on the mounting rack 6 through a fixing bracket 8.
Further, the adjusting range of the width of the air gap between the L-shaped iron core 2 and the upright iron core 3 is 0-20 mm.
Further, the air gap between the L-shaped iron core 2 and the upright iron core 3 is adjusted through a lifting screw rod 7, the lifting screw rod 7 is installed on the installation rack 6, the lifting screw rod 7 is connected with the upright iron core 3, the lifting screw rod 7 can be moved up and down by rotating a turntable of the lifting screw rod 7, so that the upright iron core 3 is driven to move up and down in the vertical direction, the air gap is adjusted by controlling the distance between the upright iron core 3 and the L-shaped iron core 2 through the lifting screw rod 7, and the magnetic field intensity inside the active magnetic regenerator is affected.
Further, the power supply 4 realizes direct-current voltage output through a transformer and a rectifying and filtering circuit, or realizes direct-current voltage output through serial-parallel combination of storage batteries (lead-acid storage batteries or lithium batteries and the like).
Further, the power-on and power-off processes of the electromagnetic coil 1 are realized through the IGBT bridge circuit, when the IGBT bridge circuit is opened, a direct current power supply is provided for the electromagnetic coil 1, the voltage is 80-800V, the current is continuously adjustable between 10-100A, and the electromagnetic coil 1 generates a periodic stable magnetic field; the shortest rising time of the response curve of the magnetic field can reach 20ms, the falling time is equal to the rising time, the absolute value of the slope of the rising and falling curve is equal, the magnetic field stabilizing time is adjustable, and the response frequency is 0.1-10 Hz; after the solenoid 1 is de-energized, the energy released in the solenoid 1 is recovered.
Further, the electromagnetic field system comprises a control board 5, wherein the control board 5 is connected with the power supply 4 and is used for controlling power supply parameters.
Further, the electromagnetic field system also comprises a Hall sensor, the current magnetic field intensity of the electromagnetic coil 1 is detected through the Hall sensor, and the magnetic field intensity measuring precision is better than 1%.
Further, the electromagnetic field system also comprises a current sensor, wherein the current sensor is used for detecting the current passing through the electromagnetic coil 1, hysteresis control is adopted, and the stability of the current intensity is ensured; the measuring range of the current sensor is 0-120A, and the measuring precision is better than 0.5%.
There are two embodiments of the power supply 4.
The first mode is a transformer scheme. As shown in fig. 2, after the industrial electricity is boosted by the transformer 9, the maximum 800V direct-current voltage is output by the rectifying and filtering device 10, a bridge circuit is formed by opening the first IGBT 12 and the fourth IGBT 15 in the driving circuit, the electromagnetic coil 1 is electrified, and when the current of the electromagnetic coil 1 reaches a required value, the stable current is maintained by PWM chopping treatment; the first IGBT 12 and the fourth IGBT 15 in the driving circuit are closed, the second IGBT 13 and the third IGBT 14 are opened to form another bridge circuit, and the energy stored by the electromagnetic coil 1 is released into the energy storage capacitor 11.
The second mode is a battery scheme. As shown in fig. 3, the power supply can also be realized by the storage battery pack 16, the upper IGBT17 and the lower IGBT 20 are turned on to power the electromagnetic coil 1, after the current sensor 18 detects that the current reaches the required current, the PWM chopping process is performed to control the switching of the upper IGB T17 and the lower IGBT 20 to realize a stable current, and a stable magnetic field is maintained; the upper IGBT17 and the lower IGBT 20 are turned off, the electromagnetic coil 1 is powered off, and the energy stored in the electromagnetic coil 1 is discharged into the battery pack 16 through the upper freewheel diode 19 and the lower freewheel diode 21.
The working principle of the invention is as follows:
in the invention, the control board 5 controls the circuit of the electromagnetic field system through controlling the power supply 4, and according to the magnetic circuit theory, when the electromagnetic coil 1 is electrified, the C-shaped iron core forms a magnetic loop due to electromagnetic induction, and then a uniform magnetic field with certain strength is formed in an air gap. In the magnetic circuit, exciting current is alternating current, so magnetomotive force in the magnetic circuit and magnetic flux excited by the magnetomotive force alternate along with time, and therefore the air gap magnetic field intensity inside the C-shaped iron core changes along with time, the electromagnetic field system can realize that the alternating frequency of current is 0.1-10 Hz, the rising edge and the falling edge of the magnetic field are controllable, meanwhile, the rising time of the magnetic field is small, current can be changed in a square wave alternating manner between rated current and 0, and meanwhile, the lifting of the upright column iron core can be controlled through the lifting screw rod to control the air gap width of the C-shaped iron core, so that the magnetic field intensity in the air gap is adjusted.
When the electromagnetic field system is applied to a magnetic refrigerator, a periodic variation of the magnetic field can be achieved by controlling the alternating frequency of the current. When the electromagnetic coil 1 is electrified, the C-shaped iron core forms a magnetic loop, a uniform magnetic field with certain intensity is formed in an air gap, and a magnetic working medium in the active magnetic heat regenerator arranged in the air gap space undergoes an excitation process and enters a heat release process; then the electromagnetic coil 1 is powered off, the magnetic field intensity in the air gap of the C-shaped iron core is rapidly weakened, and the magnetic working medium in the active magnetic heat regenerator undergoes a demagnetizing process and enters an endothermic process.
Example 1:
the electromagnetic coil 1 adopts a 28-strand parallel winding mode, and each strand of wire adopts a wire diameter of 1 mm. The whole electromagnetic coil 1 can be equivalent to a series resistor and an inductor, and the resistance value of the whole electromagnetic coil is 0.518 omega and the inductance is 0.164H through formula calculation. The power supply 4 adopts the first mode described above, namely the transformer scheme. As shown in fig. 2, after the industrial electricity is boosted by the transformer 9, the maximum 800V direct-current voltage is output by the rectifying and filtering device 10, a bridge circuit is formed by opening the first IGBT 12 and the fourth IGBT 15 in the driving circuit, the electromagnetic coil 1 is electrified, and when the current of the electromagnetic coil 1 reaches a required value, the stable current is maintained by PWM chopping treatment; the first IGBT 12 and the fourth IGBT 15 in the driving circuit are closed, the second IGBT 13 and the third IGBT 14 are opened to form another bridge circuit, and the energy stored by the electromagnetic coil 1 is released into the energy storage capacitor 11. According to the equivalent LR series first-order circuit principle, 800V dc constant voltage is adopted to achieve the coil current 80A, and the required time is t=l/rn (1/(1-i×r/U))=17.4 ms, because the variation simulation of the inductance value results in a time of about 20ms. The time for controlling the current to maintain the stability 80A is 30ms, the time for controlling the current to maintain the stability 0A is 30ms, and the current rising time and the current falling time form an operation period of 100ms, so that the system frequency of 0.1HZ is realized; when the width of the air gap is 16mm, the magnetic field strength in the air gap can reach 2T at maximum.
The above examples are only illustrative of the present invention and are not intended to limit the embodiments of the present invention, and any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention.
Claims (10)
1. An electromagnetic field system for a magnetic refrigerator is characterized by comprising an electromagnetic coil, an L-shaped iron core, a column iron core, a power supply and an installation rack; the electromagnetic coil, the L-shaped iron core and the upright post iron core are all arranged on the mounting rack; the L-shaped iron core and the upright iron core are matched to form a C-shaped iron core, an electromagnetic coil is wound on one side of the C-shaped iron core, and a magnetic field is generated after the electromagnetic coil is electrified and used for magnetizing the C-shaped iron core; the power supply is connected with the wiring terminal of the electromagnetic coil to realize direct-current voltage output; an air gap is arranged between the L-shaped iron core and the upright iron core, the width of the air gap can be adjusted, and an active magnetic heat regenerator in the magnetic refrigerator is arranged in the air gap.
2. An electromagnetic field system for a magnetic refrigerator as claimed in claim 1 wherein the L-shaped core and the column core are formed by stacking silicon steel sheets.
3. An electromagnetic field system for a magnetic refrigerator as claimed in claim 1 wherein the electromagnetic coil is a multi-strand parallel winding type, and the wire is a magnetically soft copper round enameled wire.
4. An electromagnetic field system for a magnetic refrigerator as claimed in claim 1 wherein the width of the air gap between the L-shaped core and the column core is adjusted in the range of 0 to 20mm.
5. An electromagnetic field system for a magnetic refrigerator according to claim 1 wherein the air gap between the L-shaped iron core and the column iron core is adjusted by a lifting screw, the lifting screw is mounted on a mounting rack, the lifting screw is connected with the column iron core, a turntable rotating the lifting screw moves the lifting screw up and down to drive the column iron core to move up and down in a vertical direction, and the lifting screw adjusts the air gap by controlling a distance between the column iron core and the L-shaped iron core to affect a magnetic field strength inside the active magnetic regenerator.
6. An electromagnetic field system for a magnetic refrigerator according to claim 1 wherein the power supply is configured to achieve a dc voltage output through a transformer and a rectifying and filtering circuit or a series-parallel combination of batteries.
7. An electromagnetic field system for a magnetic refrigerator as claimed in claim 6 wherein the powering up and powering down of the electromagnetic coil is accomplished by an IGBT bridge.
8. An electromagnetic field system for a magnetic refrigerator as claimed in claim 1, further comprising a control board, the control board being connected to a power source for controlling a power source parameter.
9. An electromagnetic field system for a magnetic refrigerator as claimed in claim 1, further comprising a hall sensor by which the current magnetic field strength of the electromagnetic coil is detected.
10. An electromagnetic field system for a magnetic refrigerator according to claim 1, further comprising a current sensor for detecting a current passing through the electromagnetic coil, wherein hysteresis control is employed to secure the current intensity stability.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810785773.3A CN108709334B (en) | 2018-07-17 | 2018-07-17 | Electromagnetic field system for magnetic refrigerator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810785773.3A CN108709334B (en) | 2018-07-17 | 2018-07-17 | Electromagnetic field system for magnetic refrigerator |
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| Publication Number | Publication Date |
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| CN108709334A CN108709334A (en) | 2018-10-26 |
| CN108709334B true CN108709334B (en) | 2023-11-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810785773.3A Active CN108709334B (en) | 2018-07-17 | 2018-07-17 | Electromagnetic field system for magnetic refrigerator |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116539942A (en) * | 2023-07-06 | 2023-08-04 | 深圳市知用电子有限公司 | Magnetic flux detection system and current sensor |
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| JP2002013659A (en) * | 2000-06-29 | 2002-01-18 | Denso Corp | Solenoid valve |
| CN102376425A (en) * | 2010-08-25 | 2012-03-14 | 天津市新阳电子有限公司 | Inserted-type automobile ignition coil iron core provided with air gap magnetic steel disc |
| CN102538285A (en) * | 2010-12-29 | 2012-07-04 | 中国科学院理化技术研究所 | Magnetic refrigeration and regenerative gas refrigeration composite method and refrigerating device |
| CN204143989U (en) * | 2014-10-24 | 2015-02-04 | 黄通领 | The adjustable AC magnetic field device of a kind of water-cooled air gap |
| CN106949673A (en) * | 2017-03-27 | 2017-07-14 | 中国科学院理化技术研究所 | A kind of active magnetic regenerator and magnetic refrigerating system |
| CN208547142U (en) * | 2018-07-17 | 2019-02-26 | 浙江磁石科技有限公司 | A kind of electromagnetism field system for magnetic refrigerator |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110048031A1 (en) * | 2009-08-28 | 2011-03-03 | General Electric Company | Magneto-caloric regenerator system and method |
-
2018
- 2018-07-17 CN CN201810785773.3A patent/CN108709334B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002013659A (en) * | 2000-06-29 | 2002-01-18 | Denso Corp | Solenoid valve |
| CN102376425A (en) * | 2010-08-25 | 2012-03-14 | 天津市新阳电子有限公司 | Inserted-type automobile ignition coil iron core provided with air gap magnetic steel disc |
| CN102538285A (en) * | 2010-12-29 | 2012-07-04 | 中国科学院理化技术研究所 | Magnetic refrigeration and regenerative gas refrigeration composite method and refrigerating device |
| CN204143989U (en) * | 2014-10-24 | 2015-02-04 | 黄通领 | The adjustable AC magnetic field device of a kind of water-cooled air gap |
| CN106949673A (en) * | 2017-03-27 | 2017-07-14 | 中国科学院理化技术研究所 | A kind of active magnetic regenerator and magnetic refrigerating system |
| CN208547142U (en) * | 2018-07-17 | 2019-02-26 | 浙江磁石科技有限公司 | A kind of electromagnetism field system for magnetic refrigerator |
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