CN102337384A - Destressing method and device for amorphous alloy transformer iron core - Google Patents
Destressing method and device for amorphous alloy transformer iron core Download PDFInfo
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- CN102337384A CN102337384A CN2011102744898A CN201110274489A CN102337384A CN 102337384 A CN102337384 A CN 102337384A CN 2011102744898 A CN2011102744898 A CN 2011102744898A CN 201110274489 A CN201110274489 A CN 201110274489A CN 102337384 A CN102337384 A CN 102337384A
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Abstract
The invention discloses a destressing method and device for an amorphous alloy transformer iron core, wherein the method comprises the steps of: loading an iron core to a heating furnace chamber; exhausting the air inside the furnace chamber by injecting an inert gas into the heating furnace chamber; heating up the heating furnace chamber; keeping the temperature of the heating furnace chamber when the iron core temperature reaches a keeping temperature, wherein the iron core keeping temperature is 342-348 DEG C, and the temperature keeping time is 40-50 min; cooling the iron core, wherein the cooling step comprises a step of cooling the heating furnace chamber and a step of cooling the iron core along with the furnace; and keeping to feed the inert gas into the furnace in the processes of heating up, keeping temperature and cooling the heating furnace chamber. By adopting the method and the device disclosed by the invention, the stresses of the amorphous alloy generated in the processes of fast quenching, winding, cutting, forming and the like are effectively eliminated, and no-load loss of the amorphous alloy iron core is obviously reduced.
Description
Technical field
The present invention relates to transformer core manufacturing technology field, particularly relate to a kind of amorphous alloy transformer core method for removing stress and device.
Background technology
The material of people's contact generally has two kinds in daily life: a kind of is crystalline material, and another kind is an amorphous material.So-called crystalline material is meant that the atomic arrangement of material internal is followed certain rules.Otherwise inner atomic arrangement is in random state, then is amorphous material.General metal, its inner atomic arrangement is orderly, all belongs to crystalline material.Discover that metal is after fusing, inner atom is in active state, in case metal begins to cool down, atom will be along with decrease of temperature, and lines up in an orderly manner according to certain crystalline state rule at leisure, forms crystal.If process of cooling is very fast, atom also has little time to arrange again, the forming core crystallization just is solidified, and then has kept liquid structure, has just produced amorphous alloy thus.
Amorphous alloy is compared with crystal alloy, in physicals, chemical property and mechanical properties significant variation has taken place all.With the ferro element is that main amorphous alloy is an example, and it has high saturated magnetic induction and low-loss characteristics.Because such characteristic, amorphous alloy material has possessed wide application space in various fields such as electronics, Aeronautics and Astronautics, machinery, microelectronics.
It is worth noting especially; The application of non-crystaline amorphous metal in field transformer---amorphous alloy transformer; Its magnetic hysteresis and eddy losses are very little, and open circuit loss can reduce about 70% than general silicon sheet core, has lower exciting power simultaneously; Be the comparatively ideal substation transformer of present energy-saving effect, be specially adapted to rural power grids and the lower place of developing region even load rate.
Therefore, the manufacturing of the amorphous alloy iron core directly related with the amorphous alloy transformer performance just seems particularly important.Amorphous alloy iron core is to utilize amorphous alloy strips to process, manufacturing processed relate to amorphous alloy strips fast quenching, punching, technology such as roll.Yet in these technical process, very easily produce stress, and these stress directly affect the electromagnetic performance of amorphous alloy iron core.Therefore, often adopt multiple means such as mechanical vibration and thermal treatment to remove these stress.Wherein, under magnetic field condition, carrying out anneal, is exactly a kind of method of important removal stress, is the critical process that the non-crystaline amorphous metal iron core is made.
Application number is 200910049951.7; The one Chinese patent application that open day is on November 11st, 2009 just discloses a kind of process for heat treatment of amorphous transformer core; A kind of heat treatment furnace is specifically disclosed; Heated thorax 1, heat treatment furnace vacuum thorax 2, heating and temperature controlling device 3, added magnetic machine 4, Stage microscope 5 by heat treatment furnace, nitrogengas cylinder 7, vacuum pump 8 and tensimeter 9 are formed.In use, the amorphous iron core that coiling is good is put into heat treatment furnace vacuum thorax 2, winds 5 circle diameter 10mm bag varnished insulation thick copper lines, builds bell.Open valve 10 and vacuum pump 8, when vacuum tightness be extracted into-stop vacuum pump 8 during 0.1MPa, and close valve 10 towards vacuum pump 8.Opening valve 6 and nitrogengas cylinder 7 afterwards, charge into nitrogen, is 0.4MPa up to nitrogen pressure, closes nitrogengas cylinder 7 and valve 6 then.Set heating curve, make temperature rise rate be set in 3 ℃/min, 480 ℃ of holding temperatures are incubated 1 hour.Start heating temperature control device 3 and begin to heat up, begin insulation after rising to 480 ℃ of holding temperatures, between soak, add the longitudinal magnetic field of 5V100A; Be incubated after 1 hour, stop heating, the beginning furnace cooling stops magnetic field after cooling finishes; At iron core surface coated epoxy resin, treat to pull down support frame behind the hardening of resin at last, obtain finished product.
In the above heat treatment furnace; The existence of vacuum thorax 2 and vacuum pump 8 certainly will to the stopping property of whole plant propose higher requirement (as; Stopping property, heat treatment furnace and pipeline material therefor etc. that heat treatment furnace closure, pipeline connect); Increased the extra-expense of equipment purchasing, the maintenance cost of equipment also increases simultaneously; In addition, during equipment work, be to vacuumizing processing in the stove, because furnace chamber is bigger, the pumpdown time certainly will be longer, reduced working efficiency.What is more important; Because furnace gas has been carried out vacuumizing processing; Cause the suction between the amorphous lamination to increase, be prone to take place the sintering phenomenon between the amorphous lamination, the corresponding increase of the stress between the amorphous lamination when at high temperature annealing; Be unfavorable for the release of amorphous iron core stress, thereby cause the electromagnetic performance of amorphous iron core to descend.
In addition, above heat treatment furnace with amorphous iron core as on the Stage microscope 5, thereby fail effectively to utilize space, the especially upper space of whole heat treatment furnace; And when heat-treating, all need wind 5 circle diameter 10mm bag varnished insulation thick copper lines at every turn, these all certainly will reduce heat treated efficient, increase manufacturing cost.
The applicant is that 200910056484.0 Chinese patent discloses a kind of amorphous alloy iron core heat treating method and device in the application number of on August 14th, 2009 application; This device utilizes the real time temperature of a plurality of each amorphous alloy iron cores of temperature sensor monitors; The heating power of corresponding adjustment heat treatment furnace has guaranteed homogeneity and synchronism that amorphous alloy iron core is heated in heat treatment process.It utilizes bracing frame to replace traditional Stage microscope structure, has guaranteed effective utilization of heat treatment furnace.
Yet, more than two patents all reckon without the problem of amorphous iron core Tc.Tc is the stagnation point that magneticsubstance externally shows magnetic, is higher than this stagnation point, and magneticsubstance does not externally show magnetic.And amorphous iron core Tc is generally about 390 ℃: only below Tc, apply along the magnetic field of belt length direction; Just can make the magnetic domain of non-crystalline material form the ribbon magnetic domain along outer magnetic field direction; No longer show MS during magnetization, significantly reduce the noise of amorphous alloy iron core; Otherwise can not produce this effect.And the holding temperature of above first piece of patent is 480 ℃, and it is higher than Tc, the destressing DeGrain.The furnace temperature scope of second piece of patent is 300～400 ℃, and the amorphous alloy iron core TR is 290～390 ℃, and during the non-crystaline amorphous metal anneal of material; Relatively more responsive to temperature and time, only in a narrower temperature and time scope, just can reach best annealing effect; And the temperature and time scope in this patent is wide, and temperature is too high, overlong time; Amorphous iron core has the trend of crystallization, no longer possesses the advantage of the low open circuit loss of amorphous iron core; Temperature is low excessively, and the time is too short, does not then reach best thermal effectiveness, does not possess low open circuit loss equally.
For this reason, how a kind of low manufacturing cost, high efficiency and destressing outstanding effect amorphous alloy transformer core method for removing stress and device are provided, have become the technical problem that industry needs to be resolved hurrily.
Summary of the invention
The object of the present invention is to provide a kind of amorphous alloy transformer core method for removing stress and device, improving the disappearance of prior art, in the production efficiency that improves amorphous transformer core, reduce its production cost in, improve its destressing effect.
For this reason, the present invention provides a kind of amorphous alloy transformer core method for removing stress, and it comprises: load in iron core to the heating furnace chamber; Discharge air in the furnace chamber through injecting inert gas in the heating furnace chamber; The heating furnace chamber is heated up; When treating that the iron core temperature reaches holding temperature, the heating furnace chamber is incubated, wherein, the iron core holding temperature is 342～348 ℃, and soaking time is 40～50min; Iron core is lowered the temperature, and it comprises that furnace chamber cools off and the step of iron core furnace cooling to heating; Wherein in above intensification, insulation, the heating furnace chamber is carried out in the refrigerative process, keep in stove, feeding rare gas element.
Further, said rare gas element comprises rare gas or nitrogen.
Further, described amorphous alloy transformer core method for removing stress also comprises: in the said process that the heating furnace chamber is heated up, when the iron core temperature reaches 200 ℃, iron core is applied a magnetic field; Keep this magnetic field when iron core being cooled to below 200 ℃, to stop.
Further, the direction of said magnetic field magnetic line is along the belt length direction of the non-crystaline amorphous metal of iron core.
Further, in the process that iron core is lowered the temperature, earlier the heating furnace chamber is cooled off, when the iron core temperature drops to 250 ℃, open the heating furnace chamber and carry out the iron core furnace cooling.
It is further, said that to carry out the refrigerative rate of cooling be 6～9 ℃/min to the heating furnace chamber.
The present invention also provides a kind of amorphous alloy transformer core destressing device, and it comprises: the heating furnace chamber is used to load iron core in it; Temperature control device is connected with the heating furnace chamber, and after loading iron core in the heating furnace chamber, temperature control device heats up to the heating furnace chamber; When treating that the iron core temperature reaches holding temperature, the heating furnace chamber is incubated, wherein, the iron core holding temperature is 342～348 ℃; After waiting to be incubated 40～50min the heating furnace chamber is cooled off; Inert gas source is communicated to the heating furnace chamber through a gas passage; Valve is arranged on the said gas passage, wherein after loading iron core in the heating furnace chamber, opens valve injecting inert gas and discharge air in the furnace chamber in heating furnace chamber; And at temperature control device the heating furnace chamber heated up, in insulation and the refrigerative process, keep in stove, feeding rare gas element; Supply magnetic machine, for the iron core in the heating furnace chamber provides magnetic field.
Further, said rare gas element comprises rare gas or nitrogen.
Further, said confession magnetic machine comprises: magnetize power supply and the copper bar that is attached thereto, and said copper bar comprises a plurality of equally distributed placed in-line copper bars, each copper bar is provided with a plurality of iron cores support portion, to load a plurality of iron cores.
Further, the electric current that passes through in the said copper bar is 1200～1300A.
Further, described amorphous alloy transformer core destressing device also comprises: microscope carrier, said copper bar is arranged on this microscope carrier, and the said heating furnace chamber of removable turnover.
Further, the direction of said magnetic field magnetic line is along the belt length direction of the non-crystaline amorphous metal of iron core.
Further, in the process that temperature control device heats up to the heating furnace chamber, when the iron core temperature reached 200 ℃, said confession magnetic machine was opened, and iron core is applied a magnetic field, and kept supplying the magnetic machine unlatching when the iron core temperature is reduced to below 200 ℃, to close.
Further, when the iron core temperature dropped to 250 ℃, said temperature control device was closed, and opened the heating furnace chamber and carried out the iron core furnace cooling.
Further, to carry out the refrigerative rate of cooling be 6～9 ℃/min to said temperature control device to the heating furnace chamber.
In sum; The present invention fully takes into account and vacuumizes processing to the negative impact of amorphous iron core stress removing and the expense on the equipment cost; In heat treatment process, utilize the mode that continues the feeding rare gas element to replace traditional processing that vacuumizes; Keep malleation in the furnace chamber, prevent air admission and the oxidation iron core; Simultaneously; It is relatively more responsive when the present invention fully takes into account amorphous alloy material annealing to temperature and time; The iron core holding temperature is controlled in the narrower temperature and time scope below the Tc, reaches best annealing effect, make amorphous iron core possess the advantage of low open circuit loss.Therefore; Adopt above amorphous alloy transformer core method for removing stress and device that amorphous alloy iron core is carried out anneal; Can effectively remove the stress that non-crystaline amorphous metal produces in processes such as fast quenching, coiling, cutting, moulding, significantly reduce the open circuit loss of amorphous alloy iron core.In addition,, make the magnetic domain of non-crystalline material form the ribbon magnetic domain, no longer show MS during magnetization, significantly reduce the noise of amorphous alloy iron core along outer magnetic field direction through magneticline of force annealing along the belt length direction.
Description of drawings
Fig. 1 is a kind of structural representation of existing amorphous transformer core heat treatment furnace;
Fig. 2 is the structural representation of the amorphous alloy transformer core destressing device that one embodiment of the invention provided;
Fig. 3 is the structural representation of the copper bar of the amorphous alloy transformer core destressing device that one embodiment of the invention provided;
Fig. 4 is the schematic flow sheet of the amorphous alloy transformer core method for removing stress that one embodiment of the invention provided.
Embodiment
For letting the above-mentioned feature and advantage of the present invention can be more obviously understandable, hereinafter is special lifts exemplary embodiment, and conjunction with figs., elaborates as follows.
The present invention fully takes into account and vacuumizes processing to the negative impact of amorphous iron core stress removing and the expense on the equipment cost; In heat treatment process, utilize the mode that continues the feeding rare gas element to replace traditional processing that vacuumizes; Keep malleation in the furnace chamber, prevent air admission and the oxidation iron core; Simultaneously; It is relatively more responsive when the present invention fully takes into account amorphous alloy material annealing to temperature and time; The iron core holding temperature is controlled in the narrower temperature and time scope below the Tc, reaches best annealing effect, make amorphous iron core possess the advantage of low open circuit loss.
Specifically, please referring to Fig. 2, it is the structural representation of the amorphous alloy transformer core destressing device that one embodiment of the invention provided.As shown in the figure, this device comprises heating furnace chamber 210, temperature control device 220, inert gas source 230, valve 240 and supplies magnetic machine 250.Wherein, be used to load iron core 100 in the heating furnace chamber 210; Temperature control device 220 is connected with heating furnace chamber 210, and the temperature that heats furnace chamber 210 is controlled, comprise to its heat up, insulation and refrigerative process.Specifically, after loading iron core 100 in the heating furnace chamber 210,220 pairs of heating of temperature control device furnace chamber 210 heats up; When treating that iron core 100 temperature reach holding temperature, the heating furnace chamber is incubated, wherein, the iron core holding temperature is 342～348 ℃; After waiting to be incubated 40～50min heating furnace chamber 210 is cooled off; Inert gas source 230 is communicated to heating furnace chamber 210 through a gas passage 260; Valve 240 is arranged on the gas passage 260; Open and close with pilot-gas passage 260; Specifically, after loading iron core 100 in the heating furnace chamber 210, open valve injecting inert gas and discharge air in the furnace chamber in heating furnace chamber 210; And heat up at 220 pairs of temperature control devices heating furnace chamber 210, in insulation and the refrigerative process, keep in stove, feeding rare gas element; Supply magnetic machine 250 for the iron core 100 in the heating furnace chamber 210 provides magnetic field, be in the magnetic field environment to guarantee above heat treatment process.
It is thus clear that the present invention directly utilizes the mode that feeds rare gas element to discharge the air in the stove,, prevent amorphous iron core oxidation when annealing to guarantee that in the stove be inert gas environment; When heating furnace chamber 210 is in closing condition, keeps in stove, feeding the state of rare gas element always, thereby keep malleation in the stove simultaneously, prevent air admission, iron core oxidation.So, the setting of needing no vacuum thorax and vacuum pump has reduced investment cost of equipment and corresponding maintenance cost, has improved working efficiency, helps the release of amorphous lamination stress, and then improves the electromagnetic performance of amorphous iron core.
Above rare gas element can be for the inactive gas of chemical property such as rare gas or nitrogen, and is preferable from cost consideration, selects nitrogen for use.And the time that begins to feed rare gas element is relevant with size, the gas flow of heating furnace chamber, and the present invention does not do any restriction at this.
Need to prove that the Tc of amorphous iron core (Tc is the stagnation point that magneticsubstance externally shows magnetic, is higher than stagnation point, does not externally show magnetic) is generally about 390 ℃.Only below Tc, apply along the magnetic field of belt length direction, just can make the magnetic domain of non-crystalline material form the ribbon magnetic domain, no longer show MS during magnetization, significantly reduce the noise of amorphous alloy iron core, otherwise can not produce this effect along outer magnetic field direction.In addition, relatively more responsive during amorphous alloy material annealing to temperature and time, only in a narrower temperature and time scope, just can reach best annealing effect.Temperature is too high, overlong time, and amorphous iron core has the trend of crystallization, no longer possesses the advantage of the low open circuit loss of amorphous iron core; Temperature is low excessively, and the time is too short, does not then reach best thermal effectiveness, does not possess low open circuit loss equally.Consider above problem, the time that it is 342～348 ℃ that the present invention selects the iron core holding temperature, be incubated is 40～50min, to guarantee good annealing effect, reduces the noise of amorphous alloy iron core, makes amorphous iron core possess the advantage of low open circuit loss.
Preferable; The direction of above magnetic field magnetic line with through the magneticline of force annealing along the belt length direction, makes the magnetic domain of non-crystalline material form the ribbon magnetic domain along outer magnetic field direction along the belt length direction of the non-crystaline amorphous metal of iron core; No longer show MS during magnetization, significantly reduce the noise of amorphous alloy iron core.
In addition; In above embodiment, applying of magnetic field not only is confined to holding stage, but considers the influence of temperature for the annealing effect; Can produce when annealing effect and in intensification, insulation, colling stages, need only temperature; Just apply magnetic field, thereby effectively shorten soaking time, improve the annealing effect.Specifically, when the iron core temperature is lower than 200 ℃, can not produce the annealing effect basically, magnetize and can not work again yet, therefore can close the confession magnetic machine.So, preferable, in the process that 220 pairs of heating of temperature control device furnace chamber 210 heats up; When the iron core temperature reaches 200 ℃; Supply magnetic machine 250 to open, iron core is applied a magnetic field, and keep supplying magnetic machine 250 unlatchings when the iron core temperature is reduced to below 200 ℃, to close.
Please continue referring to figs. 2 and 3; Preferable, supply magnetic machine 250 to comprise the copper bar 252 that magnetizes power supply 251 and be attached thereto, copper bar 252 comprises a plurality of equally distributed placed in-line copper bars 2521; Each copper bar is provided with a plurality of iron cores support portion 2522, to load a plurality of iron cores 100.So; In the process that 220 pairs of heating of temperature control device furnace chamber 210 heats up, when the iron core temperature reaches 200 ℃, open the power supply 251 that magnetizes; Guarantee to pass through electric current in the copper bar 252; To produce, when the iron core temperature drops to below 200 ℃, close the power supply that magnetizes along the magneticline of force of the belt length direction of non-crystaline amorphous metal.Preferable, the electric current that passes through in the copper bar is 1200～1300A.
Preferable, can copper bar 252 be arranged on the microscope carrier 253, and these microscope carrier 253 removable turnover heating furnace chambers 210.It is thus clear that present embodiment has utilized microscope carrier and copper bar, replace existing copper cash coiling mode, all needing before each thermal treatment to have avoided the trouble of coiling copper cash, improved the efficient of whole heat treatment process.Certainly, the mode that the present invention also can adopt copper cabling to pass core center is handled, and is that the preferable copper bar of selecting for use is raised the efficiency.
In addition; Prior art often utilizes the mode of furnace cooling that iron core is cooled off, and above embodiment adopts temperature control device 220 after insulation, heating furnace chamber 210 to be cooled off in order to improve whole heat treated efficient; Avoided rate of cooling to receive the influence of envrionment temperature like this; Improved rate of cooling, preferable, it is 6～9 ℃/min that 220 pairs of heating of temperature control device furnace chamber 210 carries out the refrigerative rate of cooling.Why the temperature of furnace cooling is low be because, after insulation, the iron core temperature is too high, and can't open fire door, if open fire door, amorphous iron core can be in default of protection of inert gas and oxidation influences electromagnetic performance.So in above preferred embodiment, utilize 220 pairs of heating of temperature control device furnace chamber to cool off, and this mode; Can waste certain resource,, further improve for this reason; Can drop to a safety temperature in the iron core temperature, and can not close temperature control device because of under the too high oxidized situation of temperature again; Open fire door, carry out furnace cooling.
Accordingly, the present invention also provides a kind of amorphous alloy transformer core method for removing stress.As shown in Figure 4, this method may further comprise the steps:
Step S410: load iron core in the heating furnace chamber;
Step S420: discharge air in the furnace chamber through injecting inert gas in the heating furnace chamber;
Step S430: the heating furnace chamber is heated up;
Step S440: when treating that the iron core temperature reaches holding temperature, the heating furnace chamber is incubated, wherein, the iron core holding temperature is 342～348 ℃, and soaking time is 40～50min;
Step S450: iron core is lowered the temperature, and it comprises that furnace chamber cools off and the step of iron core furnace cooling to heating;
Wherein in above intensification, insulation, the heating furnace chamber is carried out in the refrigerative process, keep in stove, feeding rare gas element.And rare gas element comprises rare gas or nitrogen, and wherein the nitrogen cost is lower, so preferable employing nitrogen.
Above heat treatment process need be carried out adding under the condition of magnetic, and in the conventional art, magnetic field puts on holding stage; And applying of magnetic field not only is confined to holding stage in the present embodiment; But consider the influence of temperature for the annealing effect, and can produce when annealing effect and in intensification, insulation, colling stages, need only temperature, just apply magnetic field; Thereby effectively shorten soaking time, improve the annealing effect.Specifically, when the iron core temperature is lower than 200 ℃, can not produce the annealing effect basically, magnetize and can not work again yet, therefore can stop to add magnetic.So preferable, above method for removing stress also comprises: in the process that the heating furnace chamber is heated up, when the iron core temperature reaches 200 ℃, iron core is applied a magnetic field; Keep this magnetic field when iron core being cooled to below 200 ℃, to stop.
Preferable, the direction of magnetic field magnetic line is along the belt length direction of the non-crystaline amorphous metal of iron core.With through magneticline of force annealing along the belt length direction, make the magnetic domain of non-crystalline material form the ribbon magnetic domain along outer magnetic field direction, no longer show MS during magnetization, significantly reduce the noise of amorphous alloy iron core.
And comprise that in the process that iron core is lowered the temperature furnace chamber cools off and the step of iron core furnace cooling to heating; Successively executive mode is following for it: earlier the heating furnace chamber is cooled off; When the iron core temperature drops to 250 ℃, open the heating furnace chamber and carry out the iron core furnace cooling.Preferable, it is 6～9 ℃/min that the heating furnace chamber is carried out the refrigerative rate of cooling.
The implementation procedure of above method is described through a preferred embodiment below:
At first, be that the amorphous alloy iron core of 100kg is loaded in the heating furnace chamber with weight, the magnetize copper bar of power supply of connection is passed iron core, closed fire door, fed nitrogen purge gas 30 minutes, discharge furnace air;
Then, open temperature control device, heat up according to setting program, when the iron core temperature reaches 200 ℃, open the power supply that magnetizes, produce the magneticline of force along the amorphous alloy strip length direction, the dc fields size of current is 1250A;
Treat that the iron core temperature begins insulation when rising to 345 ℃, soaking time is 45min;
Insulation finishes to change cooling program over to, and rate of cooling is 8 ℃/min;
When treating that the iron core temperature is 250 ℃, close temperature control device, open fire door and lower the temperature with stove;
When treating that the iron core temperature is reduced to 190 ℃, close the power supply that magnetizes, termination routine.
The iron core specific loss that utilizes the electromagnetic performance tester to record is 0.22W/kg, and excitatory power is 0.6VA/kg.
Adopt above amorphous alloy transformer core method for removing stress and device that amorphous alloy iron core is carried out anneal; Can effectively remove the stress that non-crystaline amorphous metal produces in processes such as fast quenching, coiling, cutting, moulding, significantly reduce the open circuit loss of amorphous alloy iron core.In addition,, make the magnetic domain of non-crystalline material form the ribbon magnetic domain, no longer show MS during magnetization, significantly reduce the noise of amorphous alloy iron core along outer magnetic field direction through magneticline of force annealing along the belt length direction.Experiment shows, through the amorphous alloy iron core of above processing, electromagnetic performance obviously improves, and iron-loss per unit weight is lower than 0.25W/kg, and the excitatory power of unit is lower than 0.8VA/kg, and the electromagnetism index of corresponding amorphous alloy core transformer is also far below the requirement of GB.
More than show and described ultimate principle of the present invention, principal character and advantage of the present invention.Those skilled in the art should understand; The present invention is not restricted to the described embodiments; What describe in the foregoing description and the specification sheets is principle of the present invention; The present invention also has various changes and modifications under the prerequisite that does not break away from spirit and scope of the invention, and these variations and improvement all fall in the scope of the present invention that requires protection.The protection domain that the present invention requires is defined by appending claims and equivalent thereof.
Claims (15)
1. an amorphous alloy transformer core method for removing stress is characterized in that, comprising:
Load in iron core to the heating furnace chamber;
Discharge air in the furnace chamber through injecting inert gas in the heating furnace chamber;
The heating furnace chamber is heated up;
When treating that the iron core temperature reaches holding temperature, the heating furnace chamber is incubated, wherein, the iron core holding temperature is 342～348 ℃, and soaking time is 40～50min;
Iron core is lowered the temperature, and it comprises that furnace chamber cools off and the step of iron core furnace cooling to heating;
Wherein in above intensification, insulation, the heating furnace chamber is carried out in the refrigerative process, keep in stove, feeding rare gas element.
2. amorphous alloy transformer core method for removing stress according to claim 1 is characterized in that said rare gas element comprises rare gas or nitrogen.
3. amorphous alloy transformer core method for removing stress according to claim 1 is characterized in that, also comprises:
In the said process that the heating furnace chamber is heated up, when the iron core temperature reaches 200 ℃, iron core is applied a magnetic field;
Keep this magnetic field when iron core being cooled to below 200 ℃, to stop.
4. amorphous alloy transformer core method for removing stress according to claim 3 is characterized in that, the direction of said magnetic field magnetic line is along the belt length direction of the non-crystaline amorphous metal of iron core.
5. amorphous alloy transformer core method for removing stress according to claim 1 is characterized in that, in the process that iron core is lowered the temperature, earlier the heating furnace chamber is cooled off, and when the iron core temperature drops to 250 ℃, opens the heating furnace chamber and carries out the iron core furnace cooling.
6. amorphous alloy transformer core method for removing stress according to claim 1 is characterized in that, said to carry out the refrigerative rate of cooling be 6～9 ℃/min to the heating furnace chamber.
7. an amorphous alloy transformer core destressing device is characterized in that, comprising:
The heating furnace chamber is used to load iron core in it;
Temperature control device is connected with the heating furnace chamber, and after loading iron core in the heating furnace chamber, temperature control device heats up to the heating furnace chamber; When treating that the iron core temperature reaches holding temperature, the heating furnace chamber is incubated, wherein, the iron core holding temperature is 342～348 ℃; After waiting to be incubated 40～50min the heating furnace chamber is cooled off;
Inert gas source is communicated to the heating furnace chamber through a gas passage;
Valve is arranged on the said gas passage, wherein after loading iron core in the heating furnace chamber, opens valve injecting inert gas and discharge air in the furnace chamber in heating furnace chamber; And at temperature control device the heating furnace chamber heated up, in insulation and the refrigerative process, keep in stove, feeding rare gas element;
Supply magnetic machine, for the iron core in the heating furnace chamber provides magnetic field.
8. amorphous alloy transformer core destressing device according to claim 7 is characterized in that said rare gas element comprises rare gas or nitrogen.
9. amorphous alloy transformer core destressing device according to claim 7; It is characterized in that; Said confession magnetic machine comprises: power supply and the copper bar that is attached thereto magnetize; Said copper bar comprises a plurality of equally distributed placed in-line copper bars, and each copper bar is provided with a plurality of iron cores support portion, to load a plurality of iron cores.
10. amorphous alloy transformer core destressing device according to claim 9 is characterized in that, the electric current that passes through in the said copper bar is 1200～1300A.
11. amorphous alloy transformer core destressing device according to claim 9 is characterized in that, also comprises:
Microscope carrier, said copper bar is arranged on this microscope carrier, and the said heating furnace chamber of removable turnover.
12. amorphous alloy transformer core destressing device according to claim 7 is characterized in that the direction of said magnetic field magnetic line is along the belt length direction of the non-crystaline amorphous metal of iron core.
13. amorphous alloy transformer core destressing device according to claim 7; It is characterized in that; In the process that temperature control device heats up to the heating furnace chamber, when the iron core temperature reached 200 ℃, said confession magnetic machine was opened; Iron core is applied a magnetic field, and keep supplying the magnetic machine unlatching when the iron core temperature is reduced to below 200 ℃, to close.
14. amorphous alloy transformer core destressing device according to claim 7 is characterized in that when the iron core temperature dropped to 250 ℃, said temperature control device was closed, and opens the heating furnace chamber and carries out the iron core furnace cooling.
15. amorphous alloy transformer core destressing device according to claim 7 is characterized in that, it is 6～9 ℃/min that said temperature control device carries out the refrigerative rate of cooling to the heating furnace chamber.
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| CN105567925A (en) * | 2016-01-14 | 2016-05-11 | 中国科学院理化技术研究所 | Cold and heat circulating treatment technology for reducing magnetostriction coefficient of silicon steel sheet |
| CN106158345A (en) * | 2016-08-29 | 2016-11-23 | 河南中岳非晶新型材料股份有限公司 | A kind of current sensor iron core production technology |
| CN106555050A (en) * | 2015-09-24 | 2017-04-05 | 上海日港置信非晶体金属有限公司 | A kind of method for removing stress of stereo amorphous alloy wound iron core |
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| CN109994311A (en) * | 2019-04-26 | 2019-07-09 | 通变电器有限公司 | A kind of resistance to shorting amorphous alloy transformer core noise-reduction method |
| CN110373522A (en) * | 2019-07-08 | 2019-10-25 | 上海置信电气非晶有限公司 | A kind of amorphous core and its method for annealing of refusion and smelting |
| CN110468262A (en) * | 2019-09-19 | 2019-11-19 | 王晶 | Segmented continuous heat treating furnace and material heat treatment process |
| CN110993308A (en) * | 2019-12-23 | 2020-04-10 | 无锡德盛互感器有限公司 | Manufacturing process of transformer iron core |
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