CN113593870A - Magnetic suspension type packaging method for core of dry type transformer - Google Patents
Magnetic suspension type packaging method for core of dry type transformer Download PDFInfo
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- CN113593870A CN113593870A CN202110641032.XA CN202110641032A CN113593870A CN 113593870 A CN113593870 A CN 113593870A CN 202110641032 A CN202110641032 A CN 202110641032A CN 113593870 A CN113593870 A CN 113593870A
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- 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
- H01F41/005—Impregnating or encapsulating
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Abstract
The invention discloses a magnetic suspension type packaging method of a dry type transformer core, belonging to the field of electronic device packaging, which comprises the steps of putting a magnetic floating ball in glue sealing, then injecting molten epoxy resin, gradually disintegrating the magnetic floating ball, releasing the constraint of the magnetic wrinkle ball inside, increasing the volume of the magnetic wrinkle ball after being heated, further enabling the whole magnetic floating ball to be in a state of reduced mass and increased volume in the molten epoxy resin, obviously reducing the density of the magnetic wrinkle ball, further enabling the buoyancy of the magnetic wrinkle ball in the molten epoxy resin to be increased and gradually floating, continuously breaking the bubbles in the epoxy resin during floating, enabling the bubbles to overflow upwards, simultaneously gathering the magnetic powder inside the magnetic wrinkle ball during expansion of the magnetic wrinkle ball, enabling the local magnetic field to be stronger, better controlling the sinking and floating during external magnetic field application, further obviously improving the bubble removing effect, the cracking of the glue seal layer in the transformer is effectively avoided, and the potential safety hazard is reduced.
Description
Technical Field
The invention relates to the field of electronic device packaging, in particular to a magnetic suspension type packaging method for a core of a dry type transformer.
Background
Electronic devices refer to devices made by utilizing and controlling the laws of motion of electrons in vacuum, gas, or solid. Divided into electro-vacuum devices, gas-filled tube devices and solid-state electronic devices. In the analog circuit, the functions of rectification, amplification, modulation, oscillation, frequency conversion, phase locking, control, correlation and the like are performed; in digital circuits for sampling, limiting, logic, storage, counting, delaying, etc. The gas tube device is mainly used for rectifying, stabilizing voltage and displaying. Solid-state electronic devices essentially comprise: the device comprises a resistor, a capacitor, a crystal diode, a voltage stabilizing diode, an inductor, a variable capacitance diode, a crystal triode, a field effect transistor, a sensor and a transformer.
The traditional dry-type transformer is usually characterized in that the transformer core and the electronic circuit board are directly encapsulated in a plastic shell by epoxy resin, electronic potting adhesive or asphalt, so as to achieve the purposes of molding, insulation, heat dissipation, water resistance and the like.
Disclosure of Invention
1. Technical problem to be solved
Aiming at the problems in the prior art, the invention aims to provide a magnetic suspension type packaging method of a core of a dry type transformer, which comprises the steps of putting a magnetic floating ball firstly during glue sealing, then injecting molten epoxy resin, gradually disintegrating the magnetic floating ball, removing the constraint of an internal magnetic wrinkle-wrapped ball, increasing the volume of the internal magnetic wrinkle-wrapped ball under heating, further enabling the whole magnetic floating ball to be in a state of reducing the mass and increasing the volume in the molten epoxy resin, obviously reducing the density of the magnetic floating ball, further enabling the buoyancy of the magnetic wrinkle-wrapped ball in the molten epoxy resin to be increased and to gradually float upwards, continuously breaking bubbles in the epoxy resin during floating upwards, enabling the bubbles to overflow upwards, simultaneously gathering magnetic powder in the magnetic wrinkle-wrapped ball during expansion, enabling a local magnetic field to be stronger, better controlling the floating and sinking of the magnetic wrinkle-wrapped ball during external magnetic field, further obviously improving the bubble removal effect, and effectively avoiding the cracking of a glue sealing layer in the transformer, and the potential safety hazard is reduced.
2. Technical scheme
In order to solve the above problems, the present invention adopts the following technical solutions.
A magnetic levitation type packaging method of a dry type transformer core comprises the following steps:
s1, manufacturing a packaging mold according to the shape of the transformer core, and then placing the transformer core in the center of the mold;
s2, uniformly throwing the magnetic floating balls into a space between the inner wall of the mold and the core of the transformer;
s3, continuously pouring the molten epoxy resin until the epoxy resin submerges the transformer core, standing for 10-15min, gradually disintegrating the magnetic suspension ball under the high-temperature action of the molten epoxy resin, increasing the volume, increasing the buoyancy of the magnetic suspension ball in the molten epoxy resin, and gradually floating, and continuously breaking the bubbles in the epoxy resin during floating to enable the bubbles to overflow upwards;
s4, accelerating the floating of the magnetic floating ball by applying a magnetic field, floating the magnetic floating ball on the upper surface of the epoxy resin, and recovering the epoxy resin through magnetic separation;
and S5, standing for solidification, and then demolding to obtain the transformer core sealed by the glue.
Furthermore, the front, back, left, right, upper and lower surfaces of the packaging mold are of flat plate structures, the distance between the flat plate and the transformer core is not more than 10cm, the transformer core is packaged by using an independent mold, compared with the prior art that the transformer core and a shell are sealed into a whole by glue, the transformer core can be packaged in batches, and the transformer core is installed in the shell after being packaged, so that the production efficiency of the transformer is obviously improved, and the packaging mode has the advantages that the using amount of epoxy resin is relatively small, and resources are effectively saved.
Furthermore, when the magnetic floating ball is placed still in the step S3, the mold is heated to maintain the molten state of the epoxy resin, so that the epoxy resin is not easy to solidify in advance, and further the phenomenon that the floating ball floats upwards in the magnetic floating ball due to solidification is effectively avoided, so that bubbles are convenient to overflow, the amount of gaps in the epoxy resin layer after being sealed is obviously reduced, the stability of the sealing layer is improved, the sealing layer is not easy to crack, and meanwhile, the recovery of the magnetic floating ball is convenient.
Further, when standing still in step S5, one or both of air cooling and water cooling are performed simultaneously, so as to effectively accelerate cooling and curing of the epoxy resin, thereby accelerating the packaging efficiency of the transformer core.
Further, in the step S4, when the magnetic field is applied, the magnetic floating ball is controlled by the applied magnetic field to sink and float in the molten epoxy resin for multiple times, so that on one hand, the floating is accelerated to have a better effect of breaking bubbles in the molten epoxy resin, and on the other hand, the magnetic floating ball is controlled to sink and float for multiple times, so that the stirring effect on the molten epoxy resin is better, the bubbles overflow more completely, and finally the bubbles float on the epoxy resin.
Furthermore, the magnetic levitation ball comprises an outer pyrolysis body layer and a wrinkled surface magnetic core fixedly embedded in the center of the outer pyrolysis body layer, and the wrinkled surface magnetic core comprises a wrapped magnetic wrinkled ball and an inner solution control body layer fixedly embedded in the inner wall of the wrapped magnetic wrinkled ball.
Further, the outer thermolysis layer is made of the same epoxy resin as the epoxy resin for encapsulation in the step S3, and the inner thermolysis control layer is made of a hot-melt material, so that when the molten epoxy resin is poured, the outer thermolysis layer is melted by heat, and is detached from the wrinkled-surface magnetic core and integrated with the molten epoxy resin, at this time, the weight of the outer thermolysis layer is reduced, and after the outer thermolysis layer is melted, the inner thermolysis control layer is melted by heat in the same way, so as to remove the constraint on the inside and outside of the wrapped-magnet wrinkled ball, so that the expanded volume of the wrapped-magnet wrinkled ball is increased, and further, the buoyancy of the wrapped-magnet wrinkled ball is significantly increased, so that the wrapped-magnet wrinkled ball gradually and spontaneously floats, and the magnetic powder in the magnetic cavity falls into the wrapped-magnet wrinkled ball and is collected, so that the magnetism of the wrapped-magnet is stronger than that the magnetism of the magnetic powder is concentrated position, so that the control on the sinking and the recovery of the wrapped-magnet is facilitated when the magnetic field is applied, and the magnetic powder is distributed, the local magnetism is less, makes two adjacent magnetism floater be difficult for adsorbing an organic whole.
Furthermore, the magnetism-wrapped wrinkled ball is in a wrinkled state, a plurality of magnetic cavities are formed between the magnetism-wrapped wrinkled ball and the inner decomposition control layer of the inner wall, high-temperature-resistant magnetic powder is filled in the magnetic cavities, the magnetic powder is made of iron-chromium-cobalt powder, and the iron-chromium-cobalt powder can resist the high temperature of 400-plus-450 ℃, so that the magnetism-wrapped wrinkled ball is not easy to demagnetize due to the high temperature when being in molten epoxy resin, and further the magnetism-wrapped wrinkled ball can be effectively ensured to be recovered.
Furthermore, the inner control disintegration layer is filled with high-heat-conduction gas, helium is preferably selected as the high-heat-conduction gas, the molecular mass of the high-heat-conduction gas is small, and the helium can have large upward buoyancy in molten epoxy resin after the outer pyrolysis layer is disintegrated and separated, so that the upward movement of the helium is effectively guaranteed, and meanwhile, due to the high heat conductivity of the helium, the helium can be rapidly expanded, the volume of the magnetic-coated wrinkle ball is increased, the overall density is reduced, and the upward floating is realized.
Furthermore, the high-heat-conductivity gas in the inner controlled disintegration layer is filled in a saturated mode, and the magnetism-wrapped wrinkle balls are made of high-temperature-resistant elastic sealing materials, so that the stability of the magnetism-wrapped wrinkle balls is not easily affected at high temperature, and meanwhile the magnetism-wrapped wrinkle balls can be stretched and expanded under the action of helium.
3. Advantageous effects
Compared with the prior art, the invention has the advantages that:
(1) this scheme is when gluing and sealing, put in the magnetism floater earlier, then pour into fused epoxy, the magnetism floater disintegrates gradually, remove the constraint to inside package magnetism wrinkle ball, make its thermal expansion volume increase, and then make the magnetism floater wholly appear the quality diminish in fused epoxy, the state of volume increase, make its density show and reduce, and then make its buoyancy increase in fused epoxy, and come up gradually, when the come up, constantly break the bubble in the epoxy, make the bubble upwards spill over, when wrapping magnetism wrinkle ball inflation simultaneously, its inside magnetic particle gathering, make local magnetic field stronger, when external magnetic field, control to it is heavy superficial better, and then show the removal effect that improves the bubble, effectively avoid the fracture of glue seal layer in the transformer, reduce the potential safety hazard.
(2) The packaging mold is of a flat plate structure at the front, back, left, right, upper and lower surfaces, the distance between the flat plate and the transformer core is not more than 10cm, the transformer core is packaged by using an independent mold, compared with the prior art that the transformer core and a shell are sealed into a whole by glue, the transformer core can be packaged in batches, and the transformer core is installed into the shell after being packaged, so that the production efficiency of the transformer is remarkably improved.
(3) When the epoxy resin sealing layer is kept still in the step S3, the die is heated, the molten state of the epoxy resin is maintained, the epoxy resin is not easy to solidify in advance, the phenomenon that the floating of the magnetic floating ball in the epoxy resin sealing layer is influenced due to solidification is effectively avoided, the overflow of bubbles is facilitated, the amount of gaps in the epoxy resin sealing layer after the epoxy resin sealing layer is sealed is obviously reduced, the stability of the sealing layer is improved, the epoxy resin sealing layer is not easy to crack, and meanwhile, the recovery of the magnetic floating ball is facilitated.
(4) When the transformer core is kept still in the step S5, one or two of air cooling and water cooling are carried out synchronously, so that the cooling and solidification of the epoxy resin are effectively accelerated, and the packaging efficiency of the transformer core is further accelerated.
(5) In the step S4, when the magnetic field is applied, the magnetic floating ball is controlled to float in the molten epoxy resin for multiple times by the applied magnetic field, so that on one hand, the floating is accelerated to achieve a better effect of breaking the bubbles in the molten epoxy resin, and on the other hand, the magnetic floating ball is controlled to float for multiple times to achieve a better effect of stirring the molten epoxy resin, so that the bubbles overflow more completely, and finally float on the epoxy resin.
(6) The magnetic suspension ball comprises an outer pyrolysis body layer and a wrinkle surface magnetic core fixedly embedded in the center of the outer pyrolysis body layer, and the wrinkle surface magnetic core comprises a magnetic wrinkle ball body and an inner control decomposition body layer fixedly embedded in the inner wall of the magnetic wrinkle ball body.
(7) The outer thermolysis layer is made of the same material as the epoxy resin for packaging in the step S3, and the inner thermolysis layer is made of a hot-melt material, so that when the molten epoxy resin is poured, the outer thermolysis layer is melted by heat, and is separated from the wrinkle surface magnetic core, and is integrated with the molten epoxy resin, at the moment, the weight of the outer thermolysis layer is reduced, and after the outer thermolysis layer is melted, the inner thermolysis layer is melted by heat, so that the restriction on the inside and the outside of the wrapped magnetic wrinkle ball is removed, the expansion volume of the wrapped magnetic wrinkle ball is increased, the buoyancy of the wrapped magnetic wrinkle ball is obviously increased, the wrapped magnetic wrinkle ball floats upwards gradually and spontaneously in the molten epoxy resin, and the magnetic powder in the magnetic cavity falls into the wrapped magnetic wrinkle ball to be collected, so that the magnetism of the wrapped magnetic powder is stronger than that the magnetism of the magnetic powder is concentrated, the control on the sinking and the recovery of the wrapped magnetic field is facilitated, and the local magnetism is smaller when the magnetic powder is dispersed and distributed, the two adjacent magnetic floating balls are not easy to be adsorbed into a whole.
(8) The magnetism-wrapped wrinkle ball is in a shrinking state, a plurality of magnetic cavities are formed between the magnetism-wrapped wrinkle ball and the inner decomposition control layer of the inner wall, high-temperature-resistant magnetic powder is filled in the magnetic cavities, the magnetic powder is made of iron-chromium-cobalt powder, and the iron-chromium-cobalt powder can resist the high temperature of 400-450 ℃, so that the magnetism-wrapped wrinkle ball is not easy to demagnetize due to the high temperature when being in molten epoxy resin, and further the magnetism-wrapped wrinkle ball can be effectively ensured to be recovered.
(9) The gas of high heat conduction is filled to interior accuse disintegration in situ portion, and helium is preferred to high heat conduction gas, and its molecular mass is less, makes it break away from at outer pyrolysis in situ layer disintegration after, can possess great buoyancy on when fused epoxy, effectively guarantees it and shifts up, because its high heat conductivity makes helium can expand fast simultaneously, makes package magnetism wrinkle ball volume increase, and holistic density reduces, and then realizes the come-up.
(10) High heat-conducting gas in the internal control disintegration layer is filled in a saturated mode, and the magnetism-wrapped wrinkle balls are made of high-temperature-resistant elastic sealing materials, so that the stability of the magnetism-wrapped wrinkle balls is not easily affected at high temperature, and meanwhile the magnetism-wrapped wrinkle balls can be unfolded and expanded under the action of helium.
Drawings
FIG. 1 is a schematic diagram of the main flow structure of the present invention;
FIG. 2 is a schematic structural view of the magnetic float ball of the present invention;
FIG. 3 is a schematic view of the structure at A in FIG. 2;
FIG. 4 is a schematic structural view of a wrinkled watch core of the present invention before and after change;
FIG. 5 is a schematic diagram of the structure of the magnetic float ball in molten epoxy resin.
The reference numbers in the figures illustrate:
1 outer pyrolysis body layer, 2 inner control pyrolysis body layer, 3 package magnetism wrinkle ball.
Detailed Description
The drawings in the embodiments of the invention will be combined; the technical scheme in the embodiment of the invention is clearly and completely described; obviously; the described embodiments are only some of the embodiments of the invention; but not all embodiments, are based on the embodiments of the invention; all other embodiments obtained by a person skilled in the art without making any inventive step; all fall within the scope of protection of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like are to be construed broadly, e.g., "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1:
referring to fig. 1, a magnetic levitation type packaging method for a core of a dry type transformer includes the following steps:
s1, manufacturing a packaging mold according to the shape of the transformer core, and then placing the transformer core in the center of the mold;
s2, uniformly throwing the magnetic floating balls into a space between the inner wall of the mold and the core of the transformer;
s3, continuously pouring the molten epoxy resin until the epoxy resin submerges the transformer core, standing for 10-15min, gradually disintegrating the magnetic suspension ball under the high-temperature action of the molten epoxy resin, increasing the volume, increasing the buoyancy of the magnetic suspension ball in the molten epoxy resin, and gradually floating, and continuously breaking the bubbles in the epoxy resin during floating to enable the bubbles to overflow upwards;
s4, accelerating the floating of the magnetic floating ball by applying a magnetic field, floating the magnetic floating ball on the upper surface of the epoxy resin, and recovering the epoxy resin through magnetic separation;
and S5, standing for solidification, and then demolding to obtain the transformer core sealed by the glue.
The packaging mold is of a flat plate structure at the front, back, left, right, upper and lower surfaces, the distance between the flat plate and the transformer core is not more than 10cm, the transformer core is packaged by using an independent mold, compared with the prior art that the transformer core and a shell are sealed into a whole by glue, the transformer core can be packaged in batches, and the transformer core is installed into the shell after being packaged, so that the production efficiency of the transformer is remarkably improved.
When the die is kept still in the step S3, the die is heated to maintain the molten state of the epoxy resin, so that the epoxy resin is not easy to solidify in advance, the phenomenon that the floating of the magnetic floating ball in the die is influenced due to solidification is effectively avoided, the overflow of bubbles is facilitated, the amount of gaps in the epoxy resin layer after being sealed is obviously reduced, the stability of the sealed layer is improved, the sealing layer is not easy to crack, and the recovery of the magnetic floating ball is facilitated, when the die is kept still in the step S5, one or two of air cooling and water cooling are synchronously performed, the cooling solidification of the epoxy resin is effectively accelerated, the packaging efficiency of the transformer core is accelerated, when the magnetic field is applied in the step S4, the magnetic floating ball is controlled to float in the molten epoxy resin for multiple times through the external magnetic field, on one hand, the floating of the magnetic ball is accelerated, the breaking effect of the bubbles in the molten epoxy resin is better, on the other hand, the multiple floating of the magnetic ball is controlled, the stirring effect of the molten epoxy resin is better, causing the bubbles to overflow more completely and eventually to float on the epoxy.
Referring to fig. 2, the magnetic levitation ball comprises an outer pyrolysis body layer 1 and a wrinkle surface magnetic core fixedly embedded in the center of the outer pyrolysis body layer 1, the wrinkle surface magnetic core comprises a magnetic wrinkle ball 3 and an inner decomposition control layer 2 fixedly embedded in the inner wall of the magnetic wrinkle ball 3, referring to fig. 3, the magnetic wrinkle ball 3 is in a wrinkle state, a plurality of magnetic cavities are formed between the magnetic wrinkle ball 3 and the inner decomposition control layer 2 of the inner wall, high temperature resistant magnetic powder is filled in the magnetic cavities, the magnetic powder is made of iron chromium cobalt powder, the iron chromium cobalt can resist the high temperature of 400 ℃., so that the magnetic ball is not easy to demagnetize due to the high temperature when the magnetic ball is in molten epoxy resin, and further effectively ensures that the magnetic ball can be recovered, the outer pyrolysis body layer 1 is made of the same material as the epoxy resin used for encapsulation in step S3, the inner decomposition control layer 2 is made of a hot melt material, so that when the molten epoxy resin is poured, referring to fig. 5, the outer pyrolysis body layer 1 is heated and melted, therefore, the disassembly is separated from the wrinkle surface magnetic core and is integrated with the fused epoxy resin, at the moment, the weight of the outer pyrolysis body layer 1 is reduced, meanwhile, after the outer pyrolysis body layer 1 is fused, the inner control disassembly body layer 2 is heated and also fused, the constraint on the inner side and the outer side of the magnetism-wrapped wrinkle ball 3 is relieved, the expansion volume of the magnetism-wrapped wrinkle ball 3 is increased, the buoyancy of the buoyancy is obviously increased, the magnetism of the magnetism-wrapped wrinkle ball gradually and spontaneously floats on the fused epoxy resin, please refer to fig. 4, meanwhile, the magnetic powder in the magnetic cavity falls into the magnetism-wrapped wrinkle ball 3 and is converged, the magnetism of the magnetism-wrapped wrinkle ball is stronger than that of the magnetism-wrapped wrinkle ball when the magnetic powder is dispersed, the control on the sinking and the recovery of the magnetism-wrapped ball is convenient when a magnetic field is applied, in addition, when the magnetic powder is dispersed and distributed, the local magnetism is smaller, and two adjacent magnetic floating balls are not easy to be adsorbed into a whole.
Interior accuse decomposer layer 2 inside packing has the gas of high heat conduction, the preferred helium of high heat conduction gas, its molecular mass is less, make it break away from after the 1 disintegration of outer pyrolysis layer, can possess great buoyancy on when fused epoxy, effectively guarantee it shifts up, simultaneously because its high heat conductivity, make helium can expand fast, make 3 volume increases of package magnetism wrinkle ball, holistic density reduces, and then realize the come-up, interior accuse decomposes the gaseous saturated packing of high heat conduction in the layer 2, package magnetism wrinkle ball 3 is made for high temperature resistant elastic sealing material, make its stability difficult receiving influence under high temperature, make package magnetism wrinkle ball 3 can be strutted and expand under the helium effect simultaneously.
When the glue is sealed, firstly, the magnetic floating ball is put in, then, the fused epoxy resin is injected, the magnetic floating ball is gradually disintegrated, the constraint on the internal magnetic-wrapped wrinkled ball 3 is removed, the volume of the magnetic-wrapped wrinkled ball is increased by heating expansion, the whole magnetic floating ball is enabled to be in a state of being reduced in mass and increased in volume in the fused epoxy resin, the density of the magnetic-floated ball is obviously reduced, the buoyancy of the magnetic-floated ball in the fused epoxy resin is increased and gradually floats, bubbles in the epoxy resin are continuously broken when the magnetic-floated ball floats upwards, the bubbles overflow upwards, and meanwhile, when the magnetic-wrapped wrinkled ball 3 expands, the internal magnetic powder is gathered, so that a local magnetic field is stronger, when an external magnetic field is applied, the sinking and floating control is better, the bubble removing effect is obviously improved, the cracking of a glue sealing layer in a transformer is effectively avoided, and potential safety hazards are reduced.
The above; but are merely preferred embodiments of the invention; the scope of the invention is not limited thereto; any person skilled in the art is within the technical scope of the present disclosure; the technical scheme and the improved concept of the invention are equally replaced or changed; are intended to be covered by the scope of the present invention.
Claims (10)
1. A magnetic levitation type packaging method of a dry type transformer core is characterized in that: the method comprises the following steps:
s1, manufacturing a packaging mold according to the shape of the transformer core, and then placing the transformer core in the center of the mold;
s2, uniformly throwing the magnetic floating balls into a space between the inner wall of the mold and the core of the transformer;
s3, continuously pouring the molten epoxy resin until the epoxy resin submerges the transformer core, standing for 10-15min, gradually disintegrating the magnetic suspension ball under the high-temperature action of the molten epoxy resin, increasing the volume, increasing the buoyancy of the magnetic suspension ball in the molten epoxy resin, and gradually floating, and continuously breaking the bubbles in the epoxy resin during floating to enable the bubbles to overflow upwards;
s4, accelerating the floating of the magnetic floating ball by applying a magnetic field, floating the magnetic floating ball on the upper surface of the epoxy resin, and recovering the epoxy resin through magnetic separation;
and S5, standing for solidification, and then demolding to obtain the transformer core sealed by the glue.
2. A magnetic levitation type packaging method for a dry type transformer core according to claim 1, characterized in that: the front, the back, the left, the right, the upper and the lower surfaces of the packaging mold are of flat plate structures, and the distance between the flat plate and the transformer core is not more than 10 cm.
3. A magnetic levitation type packaging method for a dry type transformer core according to claim 1, characterized in that: in the step S3, the mold is heated while being left still, and the epoxy resin is maintained in a molten state.
4. A magnetic levitation type packaging method for a dry type transformer core according to claim 1, characterized in that: and when the mixture is kept still in the step S5, synchronously performing one or two of air cooling and water cooling.
5. A magnetic levitation type packaging method for a dry type transformer core according to claim 1, characterized in that: in step S4, the magnetic floating ball is controlled to sink and float in the molten epoxy resin multiple times by the applied magnetic field when the magnetic field is applied, and finally float on the epoxy resin.
6. A magnetic levitation type packaging method for a dry type transformer core according to claim 1, characterized in that: the magnetic suspension ball comprises an outer pyrolysis body layer (1) and a wrinkled surface magnetic core fixedly embedded in the center of the outer pyrolysis body layer (1), wherein the wrinkled surface magnetic core comprises a wrapped magnetic wrinkled ball (3) and an inner control body layer (2) fixedly embedded in the inner wall of the wrapped magnetic wrinkled ball (3).
7. A method for magnetically levitating and encapsulating a core of a dry transformer as claimed in claim 6, wherein: the preparation material of the outer pyrolysis body layer (1) is the same as that of the epoxy resin for packaging in the step S3, and the inner pyrolysis body layer (2) is made of hot-melt material.
8. A method for magnetically levitating and encapsulating a core of a dry transformer as claimed in claim 7, wherein: the magnetism-wrapped wrinkled ball (3) is in a wrinkled state, a plurality of magnetic cavities are formed between the magnetism-wrapped wrinkled ball (3) and the inner control solution layer (2) on the inner wall, and high-temperature-resistant magnetic powder is filled in the magnetic cavities.
9. A method for magnetically levitating and encapsulating a core of a dry transformer as claimed in claim 6, wherein: and gas with high heat conductivity is filled in the inner controlled solution layer (2), and helium is preferably selected as the gas with high heat conductivity.
10. A method for magnetically levitating and encapsulating a core of a dry transformer as claimed in claim 9, wherein: the inner control solution layer (2) is filled with high-heat-conductivity gas in a saturated mode, and the magnetism-wrapped wrinkle ball (3) is made of high-temperature-resistant elastic sealing materials.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10180812A (en) * | 1996-12-26 | 1998-07-07 | Asahi Chem Ind Co Ltd | Method for molding hollow body with floating core |
| JP2011211043A (en) * | 2010-03-30 | 2011-10-20 | Toyota Motor Corp | Method of manufacturing reactor |
| CN108511163A (en) * | 2018-03-26 | 2018-09-07 | 江苏亚威变压器有限公司 | A kind of high frequency transformer and its resin-cast method |
| CN112223684A (en) * | 2020-09-25 | 2021-01-15 | 中山市泽一照明科技有限公司 | Environment-friendly plastic injection mold |
-
2021
- 2021-06-09 CN CN202110641032.XA patent/CN113593870B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10180812A (en) * | 1996-12-26 | 1998-07-07 | Asahi Chem Ind Co Ltd | Method for molding hollow body with floating core |
| JP2011211043A (en) * | 2010-03-30 | 2011-10-20 | Toyota Motor Corp | Method of manufacturing reactor |
| CN108511163A (en) * | 2018-03-26 | 2018-09-07 | 江苏亚威变压器有限公司 | A kind of high frequency transformer and its resin-cast method |
| CN112223684A (en) * | 2020-09-25 | 2021-01-15 | 中山市泽一照明科技有限公司 | Environment-friendly plastic injection mold |
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| CN113593870B (en) | 2023-05-16 |
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