CN202648242U - Magnetic refrigeration device based on repetitive pulse magnetic field - Google Patents
Magnetic refrigeration device based on repetitive pulse magnetic field Download PDFInfo
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- CN202648242U CN202648242U CN2012202537898U CN201220253789U CN202648242U CN 202648242 U CN202648242 U CN 202648242U CN 2012202537898 U CN2012202537898 U CN 2012202537898U CN 201220253789 U CN201220253789 U CN 201220253789U CN 202648242 U CN202648242 U CN 202648242U
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Abstract
The utility model discloses a magnetic refrigeration device based on a repetitive pulse magnetic field. The magnetic refrigeration device comprises a repetitive pulse power supply, a pulse magnet, a magnetic refrigeration work medium, a hot end heat exchange unit and a cold end heat exchange unit, wherein the repetitive pulse power supply does not have a continuous flow loop and discharges for the pulse magnet, electric energy partially flows back to the repetitive pulse power supply for realizing the energy recovery, in the discharge process, the pulse magnet generates a pulse magnetic field for promoting the magnetization heat release of the magnetic refrigeration work medium, the heat generated by the magnetic work medium is transferred to a high-temperature heat source through the hot end heat exchange unit, after the discharge completion, the repetitive pulse power supply is turned off, the pulse magnet stops generating the pulse magnetic field, the magnetic refrigeration work medium is demagnetized for heat absorption, the heat is absorbed from a low-temperature heat source through the cold end heat exchange unit, the temperature of the low-temperature heat source is reduced, one discharge refrigeration period is completed, and the continuous refrigeration is realized through executing the discharge refrigeration period in such a way. The magnetic refrigeration device realizes the magnetic refrigeration through the generation of the intermittent repeated pulse magnetic field by a controllable pulse magnet, and has the characteristics that the magnetic field intensity is high, no movement component exists, the control is convenient and fast, the efficiency is high, and the refrigeration power is high.
Description
Technical field
The utility model relates to uses the magnetic refrigerating field, is specifically related to a kind of magnetic refrigeration apparatus based on repetition pulse magnetic field, is used for the refrigeration that room temperature or related industries are used warm area.
Background technology
Refrigeration Technique is indispensable for development and the needs of life of modern industry.Traditional gas compression refrigeration has promoted modern industry and life greatly, however the paces that the environmental pollution that comes along with industrialization and energy crisis have hindered it greatly.Because to the destruction of ozone layer, Montreal Agreement stipulates to stop in 2000 production and the use in fluorine Lyons comprehensively.The floride-free working medium of greatly developing has now been brought new power to refrigeration industry, yet still there is leakage in a lot of gas, poisonous, inflammable, explosive danger, even also can produce greenhouse gases.On the other hand, use compressor so that the refrigeration plant energy consumption is large, efficient is low, and very large vibration and noise are also arranged.In the epoch that this energy and environmental problem become increasingly conspicuous, refrigerating plant how to produce clean energy-saving is extremely urgent.
Magnetic refrigeration is as a kind of novel refrigeration modes, because of its without compressor, efficient is higher than gas refrigeration, has obvious power savings advantages, and used heat-transfer working medium is liquid, cleaning is not polluted, and more and more is subject to people's attention.Magnetothermal effect refers to that the temperature of some certain material can raise under the effect in magnetic field externally; Simultaneously, when cancelled the external magnetic field, material temperature can reduce back original temperature accordingly.So-called magnetic refrigeration is freezed according to magnetic working medium has a heat absorption and release when adding changes of magnetic field phenomenon (being exactly so-called magnetothermal effect) exactly.The magnetic refrigeration is as a new and high technology, and the past only applies to utmost point cryogenic refrigeration.Along with the development of magnet technology and cryogenic technique, comprise that a lot of countries of China begin to actively develop the research of room temperature magnetic refrigerating model machine in recent years.
The research that people are freezed for magnetic has had the history above more than 100 year, realizes being lower than the super low temperature refrigeration of 1K from the initial paramagnetic material (claiming again paramagnetic salt) that utilizes, to the research about ambient temperature scope back-heating type magnetic refrigeration since 20 century 70s.Some representational patents have: US4069028, US4441325, US4507928, US4785636, US5182914, US20010925032, US20050922270, KR20050126984, CN20031050050, CN20041040922, CN20061037836, CN20071064813, CN20071305996, CN20081055800, CN20081223038.
Worldwide in all open papers and patent about magnetic refrigeration apparatus, the overwhelming majority is rotary or shuttle, the first reciprocating 7T superconduction room temperature magnetic refrigerating model machine (corresponding patent US4069028) that typical representative has the G.V.Brown of U.S. NASA to propose in 1976, C.B.Zimm developed permanent magnet excitation rotary room-temperature Magnetic refrigerator (corresponding patent CN20041040922) in 2001 1.5T permanent magnet excitation rotary type magnetic refrigerating device (corresponding patent US20010925032) and China Sichuan Universitys that propose in 2004.Rising magnetic and falling magnetic of they all is to realize by moving or rotate the magnet or the magneto-caloric material itself that produce magnetic field.Because the existence of moving component, so that become very complicated in order to the device of realizing the thermodynamic cycle of magnetic refrigeration, this has not only increased the unreliability of system, fricative thermal losses has also reduced the integrally cooling efficient of system, and the complexity of heat-exchange working medium cyclic control system has also increased greatly.
In addition, the P.E.Blumenfeld of U.S. Los Alamos National Laboratory has proposed to use the electric current that slowly changes by high-temperature superconducting magnet in 2002, produce the magnetic refrigeration that the slow cycle changing magnetic field of 1.7T is realized state type.(corresponding paper High temperature superconducting magnetic refrigeration, AIP Conference Proceedings) but superconducting magnet not only involves great expense, their operation needs that also strict cryogenic conditions is arranged.The more important thing is that because the existence of A.C.power loss, the rate of change of superconducting magnet electric current all must limit within the specific limits, otherwise will cause the quench of superconducting magnet.In this case, the frequency of whole magnetic refrigeration cycle just greatly reduces, thereby has also directly reduced refrigerating capacity and the efficient of system.In addition, the Ding Renjie of Tsing-Hua University etc. also once proposed to use band energization solenoid unshakable in one's determination to produce magnetic field in 2004, realized the scheme (corresponding patent CN20031050050) of the magnetic refrigeration of movement-less part state type by the control exciting current.Although this magnetic refrigerator with iron core excitation is convenient to control and regulation, but because iron core is saturated and exciting current intensity is limited by coil heating, magnetic field intensity can not be high, can not produce and realize the necessary high-intensity magnetic field of effective magnetic refrigeration cycle, therefore, also rare corresponding further research both at home and abroad.
On the whole, the shortcoming of magnetic refrigeration apparatus is the following aspects in the world wide at present: 1) the permanent magnets magnetic field intensity is low, and the superconducting magnet cost is too expensive; 2) most magnetic refrigerator lifting magnetic process need moving components.Do not need in the only a few Magnetic refrigerator of moving component, superconducting magnet involves great expense, the operation maintenance requirement high, and iron core excitation mode magnetic field is excessively low, can't effectively excite magnetothermal effect; The control of 3) lifting magnetic system, heat-exchange system is complicated; 4) existing magnetic refrigeration apparatus energy loss is large, and efficient is low, and refrigeration work consumption is low.
The utility model content
The purpose of this utility model is to provide a kind of magnetic refrigeration apparatus based on repetitive frequency pulsed magnetic field, compares existing magnetic refrigeration apparatus, has magnetic field intensity height (more than the 5T), movement-less part, control is convenient, efficient is high and refrigeration work consumption is large characteristics.
A kind of magnetic refrigeration apparatus based on repetition pulse magnetic field comprises repeat pulse power, pulse magnet, magnetic refrigeration working substance, hot junction heat exchange unit and cold junction heat exchange unit without continuous current circuit; Repeat pulse power connects pulse magnet, is filled with magnetic refrigeration working substance in the aperture of pulse magnet, and the two ends of magnetic refrigeration working substance connect respectively hot junction heat exchange unit and described cold junction heat exchange unit;
Repeat pulse power discharges to pulse magnet, because without continuous current circuit, the electric energy of emitting partly flows back to repeat pulse power and realizes that energy reclaims; Pulse magnet generation pulsed magnetic field impels magnetic refrigeration working substance magnetization heat release in the discharge process, by the hot junction heat exchange unit heat that magnetic working medium produces is passed to high temperature heat source; Discharge is closed repeat pulse power after finishing, and pulse magnet stops to produce pulsed magnetic field, and magnetic refrigeration working substance demagnetization heat absorption is absorbed heat to low-temperature heat source by the cold junction heat exchange unit, and low-temperature heat source temperature is reduced, and so far finishes a discharge refrigeration cycle; So the discharge refrigeration cycle is carried out in circulation, realizes continuing refrigeration.
The adjacent windings interlayer of described pulse magnet is provided with heat exchanger channels.
Described repeat pulse power module comprises the charge circuit that is made of charger, charger switch element and AC capacitor group, and the concussion discharge loop that is made of described AC capacitor group, two-way parallel thyristors and described pulse magnet.
Technique effect of the present utility model is embodied in:
The utility model adopts the highfield pulse magnet, produced the magnetothermal effect that magnetic refrigerating material has been strengthened in the highfield;
The utility model adopts repeat pulse power and supporting pulse magnet thereof, has produced repetition pulse magnetic field, has realized state type magnetic refrigeration, i.e. movement-less part magnetic refrigeration.
The utility model passes through control system, to the unified control of repeat pulse power (mainly being IGCT and charger), pulse magnet and heat-exchange system (cool and heat ends control valve), compare moving component or the system of superconducting magnet is arranged, performance period, the controlled refrigeration of power have realized the simplification of control system.
The repeat pulse power without continuous current circuit that the utility model adopts, as the power supply main body, the pulse current negative sense by feedback is realized energy feedback to the charging of capacitor group, has improved refrigeration work consumption and the efficient of refrigeration system with AC capacitor.
The pulse magnet coil turn that the utility model adopts is large, and to increase pulse width, being convenient to provides the sufficient time for heat exchange.Simultaneously, by at pulse magnet coil interlayer design heat exchanger channels, the magnet exchange capability of heat is strengthened greatly, thereby made magnet under the condition of repetition pulse excitation, satisfy the temperature rise requirement of steady operation.
The utility model adopts the repeat pulse power without continuous current circuit, by cut-offfing of control reverse parallel connection IGCT, produces peak value and controlled underdamping concussion electric current and magnetic field of cycle at the pulse magnet endoporus.
The utility model in the IGCT shutoff, lost with the voltage that replenishes in the capacitor discharge process the capacitor quick charge by charger in each feedback cycle, to realize that system stability reruns.
Description of drawings
Fig. 1 is magnetic refrigeration apparatus overall structure figure;
Fig. 2 is repetition pulse power circuit schematic diagram.
The specific embodiment
Below in conjunction with accompanying drawing and enforcement the utility model is described further.
Fig. 1 has provided a kind of embodiment of the present utility model, comprises repeat pulse power 1, pulse magnet 2, magnetic refrigeration working substance 3, control module 4, control valve 5a and 5b, pump 6a and 6b, cool end heat exchanger 7 and hot end heat exchanger 8 without continuous current circuit.Control module 4, control valve 5a, pump 6a and hot end heat exchanger 8 consist of the hot junction heat exchange unit, and control module 4, control valve 5b, pump 6b and cool end heat exchanger 7 consist of the cold junction heat exchange unit.Wherein, repeat pulse power 1, the switch off time of control valve 5a and 5b, pump 6a and 6b cooperate by control module 4 control realizations.
Repeat pulse power in the existing pulse magnet technology generally all comprises continuous current circuit, and the magnetic field pulsewidth can increase like this, and still, so electric energy can consume on continued flow resistance in a large number, can not realize that electric energy reclaims, and has a strong impact on the refrigerating efficiency of device.The utility model reclaims in order to realize energy, removes the continuous current circuit of repeat pulse power.The utility model without the repeat pulse power of continuous current circuit can provide that amplitude is variable, the cycle is controlled, efficient is high, repetition pulse electric current that can steady-state operation, its specific implementation circuit can be referring to Fig. 2, it is divided into left side charge circuit and the right discharge loop, comprises charger 9, charger switch element 10, AC capacitor group 11, two-way parallel thyristors 12 and pulse magnet 2.Wherein IGCT is preferred version, other power switch components such as: IGBT, GTO etc. also replaceable IGCT realize circuit function.Except circuit shown in Figure 2, continuous current circuit (continued flow resistance series opposing diode) in parallel changes two-way parallel thyristors 12 into unidirectional thyristor at AC capacitor group 11 two ends, also can realize the function of repetition pulse electric current output.But because continuous current circuit can cause current loss, affected the efficient of magnetic refrigeration apparatus.
In order to make magnet under the condition of repetition pulse current excitation, can satisfy the temperature rise requirement of steady operation, between the coil adjacent layer of pulse magnet 2, designed heat exchanger channels.
Magnetic refrigeration apparatus specific works mode is as follows:
The step 1 preparatory stage: 10 conductings of charger switch element, 11 chargings of 9 pairs of AC capacitor groups of charger, pulse magnet is inserted magnetic refrigeration working substance 3 in 2 chambeies.
The step 2 forward discharge refrigeration cycle: as shown in Figure 2, after AC capacitor group 11 positive charge are full, charger switch element 10 turn-offs, two-way parallel thyristors 12 forwards are opened, and 2 discharges of AC capacitor group paired pulses magnet produce the positive half-wave pulsed magnetic field in the magnet aperture, the anti-AC capacitor group 11 that is charged to of discharge after-current, capacitance voltage becomes negative sense, and the two-way parallel thyristors 12 that forward is opened is with zero-crossing switching (pulse current zero passage, IGCT can automatically shut down).Simultaneously, the heat exchange aspect, as shown in Figure 1, when rising edge of a pulse, magnetic refrigeration working substance 3 be because magnetic thermal characteristics temperature can raise, and at this moment, control valve 5a, pump 6a are open-minded, magnetic refrigeration working substance produced that heat is as much as possible to be taken away by hot end heat exchanger 8.Subsequently when the pulse trailing edge demagnetizes, the temperature of magnetic refrigeration working substance can drop to than rising temperature lower (because hot end heat exchanger 8 produces heat with working medium and taken away a part) before the magnetic, like this, has just produced refrigeration effect.At this moment, turn-off control valve 5a, pump 6a, open control valve 5b, pump 6b, by cool end heat exchanger 7 and magnetic refrigeration working substance heat exchange, make the temperature recovery of magnetic refrigeration working substance, the cold that simultaneously magnetic refrigeration working substance is produced spreads out of, to realize refrigeration.Treat to turn-off control valve 5b, pump 6b near the temperature before the magnetic refrigeration working substance temperature recovery arrives experiment, finish a kind of refrigeration cycle.
The step 3 negative sense discharge refrigeration cycle: as shown in Figure 2, discharge current is counter fill after, make AC capacitor group 11 voltages become negative sense, because through step 2, there is loss in forward discharge, so the forward voltage of AC capacitor group voltage swing after than the step 1 charging is lower slightly.Subsequently, two-way parallel thyristors 12 negative senses are opened, and the AC capacitor group oppositely to magnet 2 discharges, produces negative half-wave pulse magnetic field in the magnet aperture, and the discharge after-current is got back to the capacitor group, and AC capacitor group voltage becomes again forward again.Simultaneously, identical kind of refrigeration cycle process (the magnetic thermal characteristics of magnetic refrigeration working substance 3 and magnetic direction are irrelevant) is carried out with step 2 in the heat exchange aspect.After discharge, heat exchange all finished, two-way parallel thyristors negative sense is zero-crossing switching, opened charger switch element 10 in the charge circuit, by 9 pairs of AC capacitor groups of charger positive charge, made AC capacitor group voltage get back to again the initial state that is full of.
Repeat 2,3 steps, just can realize continuing refrigeration.
Claims (3)
1. the magnetic refrigeration apparatus based on repetition pulse magnetic field is characterized in that, comprises repeat pulse power, pulse magnet, magnetic refrigeration working substance, hot junction heat exchange unit and cold junction heat exchange unit without continuous current circuit; Repeat pulse power connects pulse magnet, is filled with magnetic refrigeration working substance in the aperture of pulse magnet, and the two ends of magnetic refrigeration working substance connect respectively hot junction heat exchange unit and cold junction heat exchange unit;
Repeat pulse power discharges to pulse magnet, because without continuous current circuit, the electric energy of emitting partly flows back to repeat pulse power and realizes that energy reclaims; Pulse magnet generation pulsed magnetic field impels magnetic refrigeration working substance magnetization heat release in the discharge process, by the hot junction heat exchange unit heat that magnetic working medium produces is passed to high temperature heat source; Discharge is closed repeat pulse power after finishing, and pulse magnet stops to produce pulsed magnetic field, and magnetic refrigeration working substance demagnetization heat absorption is absorbed heat to low-temperature heat source by the cold junction heat exchange unit, and low-temperature heat source temperature is reduced, and so far finishes a discharge refrigeration cycle; So the discharge refrigeration cycle is carried out in circulation, realizes continuing refrigeration.
2. the magnetic refrigeration apparatus based on repetition pulse magnetic field according to claim 1 is characterized in that, the adjacent windings interlayer of described pulse magnet is provided with heat exchanger channels.
3. the magnetic refrigeration apparatus based on repetition pulse magnetic field according to claim 1, it is characterized in that, described repeat pulse power module comprises the charge circuit that is made of charger, charger switch element and AC capacitor group, and the concussion discharge loop that is made of described AC capacitor group, two-way parallel thyristors and described pulse magnet.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102734977A (en) * | 2012-05-31 | 2012-10-17 | 华中科技大学 | Magnetic refrigerating device based on repetitive pulsed magnetic field |
| CN104807265A (en) * | 2014-01-24 | 2015-07-29 | 海尔集团公司 | Magnetic refrigeration equipment and heat exchange liquid flow control method and control device thereof |
| CN105526733A (en) * | 2014-09-29 | 2016-04-27 | 青岛海尔股份有限公司 | Reciprocating type magnetic refrigeration device |
| CN107726663A (en) * | 2017-11-16 | 2018-02-23 | 珠海格力电器股份有限公司 | Magnetic heat exchange system, magnetic refrigeration device and thermoelastic cooling device |
| CN111094872A (en) * | 2017-06-16 | 2020-05-01 | 开利公司 | Ferroic response by application of a conjugate field |
| CN112639379A (en) * | 2018-09-14 | 2021-04-09 | 大金工业株式会社 | Fluid temperature regulating device |
| CN113508443A (en) * | 2019-02-15 | 2021-10-15 | 国家科学研究中心 | Method for generating a pulsed magnetic field and associated device |
-
2012
- 2012-05-31 CN CN2012202537898U patent/CN202648242U/en not_active Expired - Lifetime
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102734977A (en) * | 2012-05-31 | 2012-10-17 | 华中科技大学 | Magnetic refrigerating device based on repetitive pulsed magnetic field |
| CN104807265A (en) * | 2014-01-24 | 2015-07-29 | 海尔集团公司 | Magnetic refrigeration equipment and heat exchange liquid flow control method and control device thereof |
| CN104807265B (en) * | 2014-01-24 | 2017-06-27 | 海尔集团公司 | Magnetic refrigeration apparatus and its heat exchange fluid flow control methods and control device |
| CN105526733A (en) * | 2014-09-29 | 2016-04-27 | 青岛海尔股份有限公司 | Reciprocating type magnetic refrigeration device |
| CN105526733B (en) * | 2014-09-29 | 2019-07-12 | 青岛海尔股份有限公司 | Reciprocating magnetic refrigeration apparatus |
| CN111094872A (en) * | 2017-06-16 | 2020-05-01 | 开利公司 | Ferroic response by application of a conjugate field |
| CN107726663A (en) * | 2017-11-16 | 2018-02-23 | 珠海格力电器股份有限公司 | Magnetic heat exchange system, magnetic refrigeration device and thermoelastic cooling device |
| CN107726663B (en) * | 2017-11-16 | 2023-11-10 | 珠海格力电器股份有限公司 | Magnetic heat exchange system, magnetic heating type refrigerating device and thermoelastic cooling equipment |
| CN112639379A (en) * | 2018-09-14 | 2021-04-09 | 大金工业株式会社 | Fluid temperature regulating device |
| CN113508443A (en) * | 2019-02-15 | 2021-10-15 | 国家科学研究中心 | Method for generating a pulsed magnetic field and associated device |
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