CN109285681A - High stable high reliability self-loopa three-winding autotransformer and its manufacturing method - Google Patents
High stable high reliability self-loopa three-winding autotransformer and its manufacturing method Download PDFInfo
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- CN109285681A CN109285681A CN201811329765.4A CN201811329765A CN109285681A CN 109285681 A CN109285681 A CN 109285681A CN 201811329765 A CN201811329765 A CN 201811329765A CN 109285681 A CN109285681 A CN 109285681A
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F30/00—Fixed transformers not covered by group H01F19/00
- H01F30/02—Auto-transformers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Coils Or Transformers For Communication (AREA)
- Insulating Of Coils (AREA)
Abstract
The invention discloses a kind of high stable high reliability self-loopa three-winding autotransformer and its manufacturing methods, the three-winding autotransformer includes skeleton, winding, magnetic core, shielding case, encapsulating material, it is characterised in that: the alumina base that skeleton is porosity 20%-30% dredges hole foamed ceramics skeleton；Winding uses the red copper wire of 1140 epoxy polyester insulated paint of band；Magnetic core is stud silicon steel sheet magnetic core；Filled with self-loopa insulation heat-transfer filler in the gap of shielding case and other components, the self-loopa insulation heat-transfer filler is the mixture that alumina base dredges hole foamed ceramics, unvulcanised silica gel, gum rosin；Shielding case makes using aluminium alloy, full-closed structure encapsulation.Good small, high conversion efficiency, electromagnetic wave shielding, good insulating, cost performance height, long service life is lost in auto-transformer of the invention.
Description
Technical field
The present invention relates to field of electrical components more particularly to a kind of high stable high reliability self-loopa three winding self coupling transformations
Device and its manufacturing method.
Background technique
Auto-transformer: the multistage special transformer that need not be insulated exports and inputs the special change for sharing one group of coil
Depressor.In other words, the multistage transformer on same winding.The coupling of self coupling is the meaning of electromagnetic coupling, common transformer
It is that energy is transmitted by former secondary coil electromagnetic coupling, without the connection of direct electricity, the former secondary side of auto-transformer has on former pair side
The directly connection of electricity, its low-voltage coil is exactly a part of high-tension coil.
In power grid, auto-transformer is just begun with from 220KV voltage class, the multi-purpose contact made between power grid becomes, these
Auto-transformer is mostly dry-type transformer, its dielectric is the solid of resin etc, without exhausted in oil-immersed transformer
Edge oil, so referred to as dry type.220KV or less is almost without auto-transformer.Auto-transformer is using most at the lower voltage
It is intended for electric machine step-down starting use more.
Although but with the development of electric system, the increase of the raising of voltage class and transmission capacity, auto-transformer by
It is big in its capacity, small, low cost is lost and is used widely, it still has multiple limitations for being difficult to overcome: 1, dry type becomes
Depressor is since radiating condition is poor, so capacity cannot be done greatly.2, increase Power System Shortcuts electric current.Due to auto-transformer
There is the connection of electricity between high, middle pressure winding, short-circuit impedance is only the same as (1-k/1) square of the common two-winding transformer of capacity
Times, therefore dramatically increase three short circuit current using after auto-transformer in the power system.Again due to auto-transformer
Neutral point must be directly grounded, so greatly increasing the single-phase short circuit current of system, sometimes even over three-phase shortcircuit electricity
Stream.3, make the overvoltage protection of winding complicated.Due to the self coupling connection of high, middle pressure winding, when either side fall into a wave amplitude with
When the lightning surge that the winding insulation level is adapted, the wave amplitude for the overvoltage impact that the other side occurs then may be beyond this absolutely
Edge is horizontal.In order to avoid the generation of this phenomenon, it is necessary to all fill one group of valve-type arrester in high, middle pressure two sides leading-out terminal.
And at present in the related patents applied at home, not about the prior art of three-winding autotransformer, because
And need the good a kind of small, high conversion efficiency of loss, electromagnetic wave shielding, good insulating, cost performance high, with long service life in the market
Auto-transformer.
Summary of the invention
The present invention is intended to provide loss is small, high conversion efficiency, electromagnetic wave shielding is good, good insulating, cost performance is high, uses the longevity
Order long three-winding autotransformer and its manufacturing method.
To achieve the goals above, the invention adopts the following technical scheme: a kind of high stable high reliability self-loopa three around
The manufacturing method of group auto-transformer, comprising the following steps:
1) selection and preparation of each component
1. skeleton, which is selected, dredges hole foamed ceramics skeleton with the matched alumina base of stud magnetic core, select are as follows: volume resistance
Rate >=2 × 1013Ω cm, dielectric strength >=750kV/cm, thermal conductivity >=25W/mK, bending strength >=400Mpa, Young mould
Number >=320Gpa, fracture toughness >=25Mpa；
2. magnetic core selects stud silicon steel sheet magnetic core；
3. shielding case is made of aluminium alloy, using full-closed structure；
4. encapsulating material uses epoxy resin；
5. winding uses the red copper wire of 1140 epoxy polyester insulated paint of band；
6. self-loopa is insulated, heat-transfer filler selects alumina base to dredge hole foamed ceramics, unvulcanised silica gel, gum rosin；
2) manufacturing method of self-loopa insulation heat-transfer filler
1. Aluminum Chloride Hexahydrate is mixed with appropriate amount of purified water, stirs and impurity screening, allotment extremely obtain mass percent
The sodium metasilicate of Aluminum Chloride Hexahydrate weight 50%-55%, stirring is added in the liquor alumini chloridi of 58%-65% in liquor alumini chloridi
To being uniformly dissolved；
2. the 1. container for filling liquor alumini chloridi that step is obtained carries out high-frequency vibration, then will uniformly delay after ammonia atomization
It is slowly passed through in 1. liquor alumini chloridi that step is prepared, obtains solution to be processed；
3. 2. step continues high-frequency vibration 30min-40min after the completion, the solution to be processed for then 2. obtaining step is set
Under 25 DEG C -30 DEG C of isoperibol, and mechanical stirring 30min-40min, obtain preformed solution；
4. dilute hydrochloric acid solution is slowly added dropwise in 3. preformed solution that step obtains and stirs, until the pH value 4.8- of solution
5.2, it stands and obtains original sol solutions；
5. at a temperature of 4. original sol solutions that step is obtained are placed in 70 DEG C -80 DEG C, flow back 8h, prefabricated sol solutions are obtained；
6. being slowly added the poly-vinyl alcohol solution of 3-5% concentration in 5. prefabricated sol solutions that step obtains, obtain wait locate
Manage colloidal sol；
7. being carried out using the mixed solution of the 1:1 volume ratio of dehydrated alcohol and water to 6. colloidal sol to be processed that step obtains anti-
It is multiple to rinse, until cleaning, obtain stand-by colloidal sol；
8. 7. stand-by colloidal sol that step obtains is uniformly mixed with the gum rosin of Aluminum Chloride Hexahydrate weight 30%-35%, set
Particle is fired at 480 DEG C -550 DEG C, particle obtained is required self-loopa insulation heat-transfer filler；
3) processing and assembly of three-winding autotransformer
1. magnetic core is placed in alumina base to dredge in hole foamed ceramics skeleton, fixed using epoxy resin；
2. the red copper wire with insulated paint is wrapped in alumina base in such a way that single thread is three-winding dredges hole foamed ceramics bone
On frame, winding neutral ground obtains core part；
3. 2. core part that step is obtained is encapsulated using epoxy resin；
4. entire three-winding autotransformer is encapsulated using aluminium alloy shielding case, and between aluminium alloy shielding case (1) is interior
Self-loopa insulation heat-transfer filler (2) for expiring that in 2) 8. step obtains is filled in gap, that is, obtains three winding self coupling transformation to be processed
Device；
4) stabilization processes of three-winding autotransformer
1. the three-winding autotransformer to be processed that step in 3) 3. obtains is placed in household freezer, temperature not higher than-
70 DEG C, 20min-30min is kept the temperature, obtains cold treatment three-winding autotransformer；
2. step 1. after the completion of, 1. cold treatment three-winding autotransformer that step obtains is placed at room temperature, until it is warm
Degree returns back to room temperature, is then placed in baking oven, rises to 100 DEG C -105 DEG C with the heating rate not higher than 2 DEG C/min, heat preservation
25min-30min obtains thermal cycle three-winding autotransformer；
3. 2. thermal cycle three-winding autotransformer that step obtains, which is placed in, to be had at room temperature, demagnetization processing is carried out simultaneously certainly
It so stands to its temperature and returns back to room temperature；
4. be repeated 1.~3. process twice, that is, obtain needed for three-winding autotransformer.
According to the three-winding autotransformer that the above method manufactures, including skeleton, winding, magnetic core, shielding case, package material
Material, it is characterised in that: the alumina base that skeleton is porosity 20%-30% dredges hole foamed ceramics skeleton；Winding uses band 1140
The red copper wire of epoxy polyester insulated paint；Magnetic core is stud silicon steel sheet magnetic core；It is filled in the gap of shielding case and other components
Have self-loopa insulation heat-transfer filler, the self-loopa insulation heat-transfer filler) it is that alumina base dredges hole foamed ceramics, unvulcanised silicon
The mixture of glue, gum rosin；Shielding case makes using aluminium alloy, full-closed structure encapsulation.
The average volume resistivities of the three-winding autotransformer, insulating regions are not less than 1 × 1012Ω cm, has
Self-loopa heat sinking function, shielding rank are not less than T grades, and power capacity is at least 10 times of conventional same volume auto-transformer.
Compared with prior art, the invention has the following advantages that in (1) routine techniques, due to cost consideration, self coupling becomes
Depressor using lower level material prepare, as shielding case using iron material, skeleton use plastics, without using heat dissipation filler
Deng therefore for itself volume weight, iron loss or larger is oxidizable, cross that thermal lifetime is shorter (to be passed by air entirely
Heat, then transformer inner cavity is closed calm, and radiating efficiency is low, and insulative potting material is easy to aging under such environment, as shell
Ferrous material it is also oxidizable, functional stabilization difference and service life it is short), the present invention use solid granulates filler, on the one hand mention
Volume resistivity is risen, one side solid heat transfer efficiency is better than air, and another further aspect self-loopa insulation heat-transfer filler of the invention is real
It is that three kinds of material mixed onces are molding in matter, the present invention creatively utilizes the general character of three kinds of specific production technologies of material,
Disposably pass through the miscible molding of sol-gel-heat, specifically: in the solution once more when aluminium oxide ceramics or solution
Sodium metasilicate is dissolved in, alumina sol is under equal conditions precipitated jointly with silica gel after subsequent solution acidification, is directly formed mixed
Colloidal substances are closed, and (aluminium oxide need to rinse reaction residue using ethyl alcohol, and silica gel needs to float using water through ethanol water rinsing
A variety of water soluble ions are washed, and passing through repeatedly practice confirms, two kinds of effects do not conflict) purification, it is mutual to ultimately form two kinds of ingredients
The gel state of Uniform Doped, then using aluminium oxide high-melting-point, nearly 300 DEG C of the fusing point of silica gel and 70 DEG C -80 DEG C of gum rosin it is molten
Point is poor, by first liquefied gum rosin with still the alumina substrate and silica gel of semisolid are solidified into one at that time, form this hair
The basis of bright core technology.(2) since short circuit current itself is big, and as three-winding autotransformer, short-circuit voltage is bigger, is
Restrict its most critical factor used, but the insulating materials due to being used in routine techniques and winding material can not break through it is existing
Bottleneck, therefore use scope is small, performance is poor, can not carry high pressure；The present invention has selected insulation to pass on the basis of routine techniques
Hot filler, volume resistivity are not less than 2 × 1013Ω cm, dielectric strength are not less than 200kV/cm, can reinforce well certainly
The insulation performance of coupling transformer makes working region be not easy to be damaged because of short circuit current；Silica gel Absorb Water in filler, gum rosin is certainly
Oxygen uptake keeps the present invention more difficult to aging under the conditions of encapsulation, therefore low from being lost.(3) due to having selected special aluminium oxide to make pottery
Porcelain particle, according to correlative study, after alumina ceramic grain is less than certain particle size, under equal conditions, thermal impedance is small instead
In other materials, it is gross porosity that virgin rubber body of the present invention, which is the silica gel that ceramics, silica gel mix, and calcines out at 480 DEG C -550 DEG C, in addition
Silica gel (prior art) has natural porous structure, then rosin compound, and the present invention is made to have clean, long-life, pollution-free, Yi Qing
Clean characteristic, so that auto-transformer of the invention will not fail after dilatation because of overtemperature, self-loopa heat dissipation of the invention
The reason of principle is rosin fusing at 80 DEG C or so, absorbs a part of heat, and then liquefied rosin infiltrates angle by its surface,
The natural flow of pore along with glue silicon and ceramics (referring to soil water sorption capillarity principle) under capillary action, drives heat to follow
Ring, the then heat release solidification again when not working Temperature fall, slows down the temperature fluctuation gradient of transformer, repeatedly after circulation, rosin
Can all collection is rich dredges in hole foamed ceramics skeleton in ceramics-silica gel particle or alumina base as skeleton, increase of the invention
Air-tightness and insulating properties.(4) silica gel will not aging, while having the function of that (this material is non-polar material, hydrophily for water suction
It is extremely strong), while dust-proof age inhibiting effect is also played in the daily work, inner cavity dried and clean of the invention can be kept, is mentioned
Rise stability of the invention；Rosin contains many unsaturated groups, and gradually oxygen uptake changes colour in being used for a long time, but has no effect on it
(main function has two to rosin in the present invention, first is that insulating properties aoxidizes first is that heat-absorbing liquefaction recycles for use in the present invention
Insulating properties enhances afterwards, and fusing point is raised to 110 DEG C -120 DEG C or so, for the operating temperature of transformer, does not influence it
Service performance) it radiates since filler oxygen uptake absorbs water, the core part rate of ageing in inner cavity is significantly less than the prior art, uses
Service life is long.(5) packing material of the invention is insulating materials, and dielectric coefficient is high, and breakdown characteristics are strong, under normal circumstances
No longer need to add lightning protection that (it is mainly that shielding is poor that the prior art, which needs to add lightning protection, is shielded after ferrous casings rustization
Property decline, while medium be air, easily puncture, the present invention use aluminum shell, printization, shielding are good naturally, medium for insulate
Heat filling is not easy to puncture).Therefore three-winding autotransformer of the invention, which has, is lost small, high conversion efficiency, electromagnetic shielding
Property good, good insulating, cost performance be high, characteristic with long service life.
Detailed description of the invention
Fig. 1 is the structural diagram of the present invention.
In figure: shielding case 1, self-loopa insulation heat-transfer filler 2, ceramic skeleton 3, magnetic core 4, winding 5.
Specific embodiment
Embodiment 1:
A kind of high stable high reliability self-loopa three-winding autotransformer as shown in Figure 1, including skeleton, winding 5, magnetic
Core 4, shielding case 1, encapsulating material, the alumina base that middle skeleton is porosity 20%-30% dredge hole foamed ceramics skeleton 3；Around
Group 5 uses the red copper wire of 1140 epoxy polyester insulated paint of band；Magnetic core 4 is stud silicon steel sheet magnetic core 4；In shielding case 1 and other
Filled with self-loopa insulation heat-transfer filler 2 in the gap of component, the self-loopa insulation heat-transfer filler 2 is that alumina base dredges hole bubble
The mixture of foam ceramics, unvulcanised silica gel, gum rosin；Shielding case 1 makes using aluminium alloy, full-closed structure encapsulation.
The manufacturing method of the three-winding autotransformer, comprising the following steps:
1) selection and preparation of each component
1. skeleton, which is selected, dredges hole foamed ceramics skeleton 3 with the matched alumina base of stud magnetic core 4, select are as follows: volume electricity
Resistance rate >=2 × 1013Ω cm, dielectric strength >=750kV/cm, thermal conductivity >=25W/mK, bending strength >=400Mpa, Young
Modulus >=320Gpa, fracture toughness >=25Mpa；
2. magnetic core 4 selects stud silicon steel sheet magnetic core 4；
3. shielding case 1 is made of aluminium alloy, using full-closed structure；
4. encapsulating material uses epoxy resin；
5. winding 5 is using the red copper wire of 1140 epoxy polyester insulated paint of band；
6. self-loopa is insulated, heat-transfer filler 2 selects alumina base to dredge hole foamed ceramics, unvulcanised silica gel, gum rosin；
2) manufacturing method of self-loopa insulation heat-transfer filler 2
1. Aluminum Chloride Hexahydrate is mixed with appropriate amount of purified water, stirs and impurity screening, allotment extremely obtain mass percent
The sodium metasilicate of Aluminum Chloride Hexahydrate weight 50% is added in 58% liquor alumini chloridi in liquor alumini chloridi, and stirring is to being uniformly dissolved；
2. the 1. container for filling liquor alumini chloridi that step is obtained carries out high-frequency vibration, then will uniformly delay after ammonia atomization
It is slowly passed through in 1. liquor alumini chloridi that step is prepared, obtains solution to be processed；
3. 2. step continues high-frequency vibration 30min after the completion, the solution to be processed for then 2. obtaining step is placed in 25 DEG C
Isoperibol under, and mechanical stirring 30min obtains preformed solution；
4. dilute hydrochloric acid solution is slowly added dropwise in 3. preformed solution that step obtains and stirs, until the pH value 5.2 of solution, quiet
It sets and obtains original sol solutions；
5. at a temperature of 4. original sol solutions that step is obtained are placed in 70 DEG C, flow back 8h, prefabricated sol solutions are obtained；
6. being slowly added the poly-vinyl alcohol solution of 3% concentration in 5. prefabricated sol solutions that step obtains, obtain to be processed
Colloidal sol；
7. being carried out using the mixed solution of the 1:1 volume ratio of dehydrated alcohol and water to 6. colloidal sol to be processed that step obtains anti-
It is multiple to rinse, until cleaning, obtain stand-by colloidal sol；
8. 7. stand-by colloidal sol that step is obtained is uniformly mixed with the gum rosin of Aluminum Chloride Hexahydrate weight 30%, it is placed in 480
Particle is fired at DEG C, particle obtained is required self-loopa insulation heat-transfer filler 2；
3) processing and assembly of three-winding autotransformer
1. magnetic core 4 is placed in alumina base to dredge in hole foamed ceramics skeleton 3, fixed using epoxy resin；
2. the red copper wire with insulated paint is wrapped in alumina base in such a way that single thread is three-winding dredges hole foamed ceramics bone
On frame 3, winding neutral ground obtains core part；
3. 2. core part that step is obtained is encapsulated using epoxy resin；
4. entire three-winding autotransformer is encapsulated using aluminium alloy shielding case 1, and in 1 internal clearance of aluminium alloy shielding case
The self-loopa insulation heat-transfer filler 2 that step in 2) 8. obtains is expired in middle filling, that is, obtains three-winding autotransformer to be processed；
4) stabilization processes of three-winding autotransformer
1. 3) 3. three-winding autotransformer to be processed that step in obtains is placed in household freezer, -70 DEG C of temperature, protect
Warm 20min obtains cold treatment three-winding autotransformer；
2. step 1. after the completion of, 1. cold treatment three-winding autotransformer that step obtains is placed at room temperature, until it is warm
Degree returns back to room temperature, is then placed in baking oven, rises to 100 DEG C with the heating rate not higher than 2 DEG C/min, keeps the temperature 25min, obtain
Obtain thermal cycle three-winding autotransformer；
3. 2. thermal cycle three-winding autotransformer that step obtains, which is placed in, to be had at room temperature, demagnetization processing is carried out simultaneously certainly
It so stands to its temperature and returns back to room temperature；
4. be repeated 1.~3. process twice, that is, obtain needed for three-winding autotransformer.
According to the three-winding autotransformer sample that the present embodiment produces, the average volume resistivities of insulating regions are not low
In 1 × 1013Ω cm shields rank T grades, and power capacity is at least 16 times of conventional same volume auto-transformer, work accommodation
- 40 DEG C -250 DEG C of temperature, stability is good, and service life is 3 times or so of prior art MaLS.
Embodiment 2:
It is whole consistent with embodiment 1, it is in place of difference:
The manufacturing method of the three-winding autotransformer, comprising the following steps:
2) manufacturing method of self-loopa insulation heat-transfer filler 2
1. Aluminum Chloride Hexahydrate is mixed with appropriate amount of purified water, stirs and impurity screening, allotment extremely obtain mass percent
The sodium metasilicate of Aluminum Chloride Hexahydrate weight 55% is added in 65% liquor alumini chloridi in liquor alumini chloridi, and stirring is to being uniformly dissolved；
3. 2. step continues high-frequency vibration 40min after the completion, the solution to be processed for then 2. obtaining step is placed in 30 DEG C
Isoperibol under, and mechanical stirring 40min obtains preformed solution；
4. dilute hydrochloric acid solution is slowly added dropwise in 3. preformed solution that step obtains and stirs, until the pH value 4.8 of solution, quiet
It sets and obtains original sol solutions；
5. at a temperature of 4. original sol solutions that step is obtained are placed in 80 DEG C, flow back 8h, prefabricated sol solutions are obtained；
6. being slowly added the poly-vinyl alcohol solution of 5% concentration in 5. prefabricated sol solutions that step obtains, obtain to be processed
Colloidal sol；
8. 7. stand-by colloidal sol that step is obtained is uniformly mixed with the gum rosin of Aluminum Chloride Hexahydrate weight 35%, it is placed in 550
Particle is fired at DEG C, particle obtained is required self-loopa insulation heat-transfer filler 2；
4) stabilization processes of three-winding autotransformer
1. 3) 3. three-winding autotransformer to be processed that step in obtains is placed in household freezer, -80 DEG C of temperature, protect
Warm 30min obtains cold treatment three-winding autotransformer；
2. step 1. after the completion of, 1. cold treatment three-winding autotransformer that step obtains is placed at room temperature, until it is warm
Degree returns back to room temperature, is then placed in baking oven, rises to 105 DEG C with the heating rate not higher than 2 DEG C/min, keeps the temperature 30min, obtain
Obtain thermal cycle three-winding autotransformer；
According to the three-winding autotransformer sample that the present embodiment produces, the average volume resistivities of insulating regions are not low
In 3 × 1013Ω cm shields rank T grades, and power capacity is at least 18 times of conventional same volume auto-transformer, work accommodation
- 40 DEG C -250 DEG C of temperature, stability is good, and service life is 3 times or so of prior art MaLS.
The foregoing description of the disclosed embodiments, only for can be realized professional and technical personnel in the field or use this
Invention.Various modifications to these embodiments will be readily apparent to those skilled in the art, institute herein
The General Principle of definition can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore,
The present invention will not be limited to the embodiments shown herein, and is to fit to special with principles disclosed herein and novelty
The consistent widest scope of point.
Claims (2)
1. a kind of manufacturing method of high stable high reliability self-loopa three-winding autotransformer, it is characterised in that including following step
It is rapid:
1) selection and preparation of each component
1. skeleton, which is selected, dredges hole foamed ceramics skeleton with the alumina base of stud magnetic core (4) matched porosity 20%-30%
(3)；
2. magnetic core (4) selects stud silicon steel sheet magnetic core (4)；
3. shielding case (1) is made of aluminium alloy, using full-closed structure；
4. encapsulating material uses epoxy resin；
5. winding (5) uses the red copper wire of 1140 epoxy polyester insulated paint of band；
6. self-loopa is insulated, heat-transfer filler (2) select alumina base to dredge hole foamed ceramics, unvulcanised silica gel, gum rosin；
2) manufacturing method of self-loopa insulation heat-transfer filler (2)
1. Aluminum Chloride Hexahydrate is mixed with appropriate amount of purified water, stirs and impurity screening, allotment extremely obtain mass percent 58%-
The sodium metasilicate of Aluminum Chloride Hexahydrate weight 50%-55%, stirring to dissolution is added in 65% liquor alumini chloridi in liquor alumini chloridi
Uniformly；
2. by step 1. obtain fill liquor alumini chloridi container carry out high-frequency vibration, then by after ammonia atomization uniformly slowly
It is passed through in 1. liquor alumini chloridi that step is prepared, obtains solution to be processed；
3. 2. step continues high-frequency vibration 30min-40min after the completion, the solution to be processed for then 2. obtaining step is placed in 25
Under DEG C -30 DEG C of isoperibol, and mechanical stirring 30min-40min, obtain preformed solution；
4. dilute hydrochloric acid solution is slowly added dropwise in 3. preformed solution that step obtains and stirs, until the pH value 4.8-5.2 of solution, quiet
It sets and obtains original sol solutions；
5. at a temperature of 4. original sol solutions that step is obtained are placed in 70 DEG C -80 DEG C, flow back 8h, prefabricated sol solutions are obtained；
6. being slowly added the poly-vinyl alcohol solution of 3-5% concentration in 5. prefabricated sol solutions that step obtains, obtain to be processed molten
Glue；
7. being rushed repeatedly using the mixed solution of 1: 1 volume ratio of dehydrated alcohol and water to 6. colloidal sol to be processed that step obtains
It washes, until cleaning, obtains stand-by colloidal sol；
8. 7. stand-by colloidal sol that step obtains is uniformly mixed with the gum rosin of Aluminum Chloride Hexahydrate weight 30%-35%, it is placed in 480
Be fired into particle at DEG C -550 DEG C, particle obtained be needed for self-loopa insulation heat-transfer filler (2)；
3) processing and assembly of three-winding autotransformer
1. magnetic core (4) is placed in alumina base to dredge in hole foamed ceramics skeleton (3), fixed using epoxy resin；
2. the red copper wire with insulated paint is wrapped in alumina base in such a way that single thread is three-winding dredges hole foamed ceramics skeleton (3)
On, winding neutral ground obtains core part；
3. 2. core part that step is obtained is encapsulated using epoxy resin；
4. entire three-winding autotransformer is encapsulated using aluminium alloy shielding case (1), and in aluminium alloy shielding case (1) internal clearance
Self-loopa insulation heat-transfer filler (2) that in 2) 8. step obtains is expired in middle filling, that is, obtains three-winding autotransformer to be processed；
4) stabilization processes of three-winding autotransformer
1. 3) 3. three-winding autotransformer to be processed that step in obtains is placed in household freezer, temperature is not higher than -70 DEG C,
20min-30min is kept the temperature, cold treatment three-winding autotransformer is obtained；
2. step 1. after the completion of, 1. cold treatment three-winding autotransformer that step obtains is placed at room temperature, until its temperature return
It again to room temperature, is then placed in baking oven, rises to 100 DEG C -105 DEG C with the heating rate not higher than 2 DEG C/min, keep the temperature 25min-
30min obtains thermal cycle three-winding autotransformer；
3. 2. thermal cycle three-winding autotransformer that step obtains, which is placed in, to be had at room temperature, it is simultaneously naturally quiet to carry out demagnetization processing
It sets to its temperature and returns back to room temperature；
4. be repeated 1.~3. process twice, that is, obtain needed for three-winding autotransformer.
2. the three-winding autotransformer manufactured method according to claim 1, including skeleton, winding (5), magnetic core (4), screen
Cover cover (1), encapsulating material, it is characterised in that: the alumina base that skeleton is porosity 20%-30% dredges hole foamed ceramics skeleton
(3)；Winding (5) uses the red copper wire of 1140 epoxy polyester insulated paint of band；Magnetic core (4) is stud silicon steel sheet magnetic core (4)；Shielding
It covers in the gap of cover (1) and other components filled with self-loopa insulation heat-transfer filler (2), the self-loopa insulation heat-transfer filler
(2) mixture of hole foamed ceramics, unvulcanised silica gel, gum rosin is dredged for alumina base；Shielding case (1) uses aluminium alloy system
Make, full-closed structure encapsulation.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111899964A (en) * | 2020-08-03 | 2020-11-06 | 上海交通大学 | Multi-winding high-frequency transformer with solid insulation structure |
| CN112094108A (en) * | 2019-06-17 | 2020-12-18 | 力维兴电子（深圳)有限公司 | Alumina ceramic framework for transformer and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106169364A (en) * | 2016-07-28 | 2016-11-30 | 郑洪华 | A kind of three winding single-circuit transformer and manufacture method thereof |
| CN107263035A (en) * | 2017-07-12 | 2017-10-20 | 大连理工大学 | A kind of processing method of high flatness ultra-thin metal plates |
-
2018
- 2018-11-09 CN CN201811329765.4A patent/CN109285681B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106169364A (en) * | 2016-07-28 | 2016-11-30 | 郑洪华 | A kind of three winding single-circuit transformer and manufacture method thereof |
| CN107263035A (en) * | 2017-07-12 | 2017-10-20 | 大连理工大学 | A kind of processing method of high flatness ultra-thin metal plates |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112094108A (en) * | 2019-06-17 | 2020-12-18 | 力维兴电子（深圳)有限公司 | Alumina ceramic framework for transformer and preparation method thereof |
| CN111899964A (en) * | 2020-08-03 | 2020-11-06 | 上海交通大学 | Multi-winding high-frequency transformer with solid insulation structure |
| CN111899964B (en) * | 2020-08-03 | 2024-04-26 | 上海交通大学 | Multi-winding high-frequency transformer with solid insulation structure |
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