CN113674992A - Process method for impregnating wound part by using heat-conducting sizing material - Google Patents
Process method for impregnating wound part by using heat-conducting sizing material Download PDFInfo
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- CN113674992A CN113674992A CN202111006131.7A CN202111006131A CN113674992A CN 113674992 A CN113674992 A CN 113674992A CN 202111006131 A CN202111006131 A CN 202111006131A CN 113674992 A CN113674992 A CN 113674992A
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- Prior art keywords
- impregnating
- wound
- heat
- magnetic core
- winding
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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
- H01F41/02—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 for manufacturing cores, coils, or magnets
- H01F41/04—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 for manufacturing cores, coils, or magnets for manufacturing coils
- H01F41/12—Insulating of windings
- H01F41/127—Encapsulating or impregnating
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J183/00—Adhesives based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Adhesives based on derivatives of such polymers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/08—Cooling; Ventilating
- H01F27/22—Cooling by heat conduction through solid or powdered fillings
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/2876—Cooling
-
- 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
-
- 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
- H01F41/02—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 for manufacturing cores, coils, or magnets
- H01F41/04—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 for manufacturing cores, coils, or magnets for manufacturing coils
- H01F41/12—Insulating of windings
- H01F41/125—Other insulating structures; Insulating between coil and core, between different winding sections, around the coil
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Insulating Of Coils (AREA)
Abstract
The invention provides a process method for dipping a wound part by using heat-conducting rubber, which is characterized in that dipping rubber is filled between adjacent windings of a transformer magnetic core to improve the heat-conducting property, the dipping rubber adopts heat-conducting glue which is addition type silicon rubber, no solvent is contained in the rubber, small gas molecules are not generated in the curing process, the wound part is dipped in the heat-conducting glue in vacuum and then is filled between the transformer magnetic core and the windings and between the adjacent windings of the transformer magnetic core, air cannot enter between the transformer magnetic core and the windings and between the adjacent windings of the transformer magnetic core, the heat-conducting area is increased, and the heat transfer capacity of the wound part is improved.
Description
Technical Field
The invention relates to the technical field of wound part protection processes for electronic products, in particular to a process method for dipping wound parts by using heat-conducting sizing materials.
Background
In the field of electronic industry, protective measures for wound parts generally adopt a process method of vacuum impregnation of insulating paint. Under the condition of higher power requirement or under the application environment of thermal vacuum, the protection method can not meet the reliability requirement of wound parts.
At present, insulating paint for impregnating a winding part contains a solvent, has low viscosity, and is volatile in the vacuum environment. Air in gaps between the magnetic core and the winding of the winding transformer and between the winding and the winding under the vacuum condition is pumped away, solvent in insulating paint is volatilized, and gaps are remained among the windings, so that the heat of the magnetic core of the transformer can be only conducted and dissipated through the winding, and the heat dissipation condition of the magnetic core of the transformer is poor. It is therefore desirable to find suitable impregnating materials and methods for impregnating articles that improve the heat transfer capability around the article.
Disclosure of Invention
The invention provides a process method for impregnating a wound part by using a heat-conducting sizing material, aiming at the problem that the heat dissipation of a transformer magnetic core is poor in a vacuum environment by adopting a process method of vacuum impregnation of insulating paint in the protection measures of the wound part in the prior art.
The invention is realized by the following technical scheme:
a process for impregnating a wound article with a thermally conductive size, comprising the steps of:
winding the winding on the transformer magnetic core in a ring shape to form a winding part; placing the wound part in a beaker, pouring the impregnated rubber material into the beaker, and vacuumizing the beaker to remove air bubbles after the impregnated rubber material covers the wound part in the beaker; and after the vacuumizing is finished, taking out the winding part from the beaker, standing, and heating and curing to enable the impregnated rubber material to be filled between the transformer core and the winding and between adjacent windings of the transformer core.
Preferably, CN-8760 pouring sealant is adopted as the impregnating compound.
Preferably, the beaker is placed in a vacuum filling machine for evacuation and bubble removal.
Preferably, when the vacuum pumping and bubble removal are carried out in the impregnated rubber material, the vacuum pumping and bubble removal work of the impregnated rubber material is finished until the diameter of bubbles generated in the impregnated rubber material is less than 2 mm.
Preferably, the time for taking out the wound part and standing is 1-2 h after the vacuumizing is finished.
Preferably, when dripping and hanging impregnated rubber exists at the bottom of the wound part before the wound part is heated after the vacuum pumping is finished, the polyethylene plastic film is adhered with the excessive dripping and hanging impregnated rubber.
Preferably, the heating temperature is 50 ℃. + -. 5 ℃.
Preferably, the curing time is 4 to 6 hours.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention provides a process method for dipping a wound part by using heat-conducting rubber, which is characterized in that dipping rubber is filled between adjacent windings of a transformer magnetic core to improve the heat-conducting property, the dipping rubber adopts heat-conducting glue which is addition type silicon rubber, no solvent is contained in the rubber, small gas molecules are not generated in the curing process, the wound part is dipped in the heat-conducting glue in vacuum and then is filled between the transformer magnetic core and the windings and between the adjacent windings of the transformer magnetic core, air cannot enter between the transformer magnetic core and the windings and between the adjacent windings of the transformer magnetic core, the heat-conducting area is increased, and the heat transfer capacity of the wound part is improved.
Drawings
Fig. 1 is a schematic structural diagram of a wound part.
FIG. 2 is a side view of FIG. 1;
FIG. 3 is a schematic view of the impregnated wound article of the present invention;
fig. 4 is a side view of fig. 3.
In the figure: 1-winding the workpiece; 2-winding; 3-a transformer core; 4-impregnation of the sizing material.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The invention is described in further detail below with reference to the accompanying drawings:
in one embodiment of the invention, a process method for dipping a wound part by using a heat-conducting sizing material is provided, the heat-conducting performance of the wound part is effectively enhanced by changing the traditional dipping material and introducing a heat-conducting material and adopting the technologies of layering and step-by-step vacuum dipping, the reliability of the wound part in a hot vacuum environment under the condition of higher power is improved, and the design requirement is met.
Specifically, the preparation method of the heat-conducting impregnated rubber material wound part comprises the following steps:
winding 2 is annularly wound on a transformer core 3 to form a winding member 1, as shown in fig. 1 and 2; placing the wound part 1 in a beaker, pouring the impregnated rubber 4 into the beaker, and vacuumizing the beaker to remove air bubbles after the impregnated rubber 4 covers the wound part 1 in the beaker; after the evacuation is completed, the wound product 1 is taken out of the beaker, left to stand, and heated and cured, so that the impregnating compound 4 is filled between the transformer core 3 and the winding 2 and between the adjacent windings 2 of the transformer core 3, as shown in fig. 3 and 4.
In the present invention, a solvent-free, addition-type, thermally conductive material must be used to impregnate the wound article, depending on the design requirements of the product and the environment in which the product is used. According to the use requirement, CN-8760 pouring sealant is adopted for the dipping glue 4. The material is a common heat conduction material of electronic products, and has good compatibility with components. In addition, the material is used for impregnating wound parts, and has relatively proper viscosity and better manufacturability.
Specifically, the beaker is placed in a vacuum filling machine for vacuumizing and discharging air bubbles, the operation of vacuumizing → discharging air bubbles → vacuumizing is repeatedly carried out, and when the air bubbles are vacuumized and discharged in the impregnated rubber material 4, the vacuumizing and discharging air bubbles of the impregnated rubber material 4 are finished until the diameter of the air bubbles generated in the impregnated rubber material 4 is smaller than 2 mm.
And after the vacuumizing is finished, taking out the wound part 1, hanging the wound part on an airing rack, and airing at room temperature for 1-2 h.
And (4) before the coiled material is placed into an oven, checking whether dripping and hanging glue exists at the bottom of the suspended coiled material. If the glue exists, sticking excess glue stock on a clean polyethylene plastic film; . Finally, putting the mixture into an oven, and curing for 4-6 h at 50 +/-5 ℃. The high-power wound part is wound in a layered mode and is subjected to layered vacuum impregnation, gaps are filled with heat-conducting glue, and the heat-conducting area is increased. And after the impregnated rubber material 4 is cured, winding a second layer of coil on the surface of the rubber material, and manufacturing layer by layer according to the steps until the design requirement of the wound part is met.
The dipping glue material 4 adopts heat-conducting glue, the heat-conducting glue is addition type silicon rubber, no solvent is contained in the glue material, no gas micromolecule is generated in the curing process, gaps between a winding and a magnetic core of a winding part and between the winding and the winding are filled with the heat-conducting glue after the winding part is dipped in the heat-conducting glue in vacuum, the heat-conducting glue has a heat-conducting coefficient of 0.6W/m-K (0.58) which is far greater than that of air by 0.026W/m-K, and the magnetic core can conduct heat through the winding and the heat-conducting glue, so that the heat of the magnetic core can be effectively led out.
The wound part impregnated with the heat-conducting glue is mounted on a certain product for verification of a thermal vacuum test, and various performance indexes of the product meet the design requirements of the product and successfully pass the test examination.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the following embodiments are further described in detail.
When the power supply product is subjected to a thermal vacuum test, the electrical property test of the product after running for 4 hours finds that the index of the constant power output precision of the product is out of tolerance, the required value is 2000 +/-50W, and the measured value is 1939W. After the index of the constant power output accuracy exceeds the tolerance, a tester cuts off the output load, and finds that the no-load input power of the product is about 190W and is far greater than the normal no-load input power (about 20W).
Under the vacuum condition, air in gaps between the magnetic core and the winding of the transformer and between the winding and the winding is pumped away, the heat of the magnetic core can be dissipated only by conduction of the winding, and the heat dissipation condition of the magnetic core is poor. After the product runs for a certain time, the temperature of the magnetic core exceeds the Curie temperature (about 230 ℃), the magnetic permeability of the magnetic core is sharply reduced, the exciting inductance is sharply reduced, the exciting current is sharply increased, and a primary side current limiting circuit of a power supply is triggered, so that the actual output power of the product is reduced, and the constant power precision index is out of tolerance. After the output load is disconnected, the temperature of the magnetic core cannot be immediately reduced to be lower than the Curie temperature, and the exciting current is still larger, so that the no-load input power of the product is abnormally increased (about 200W) compared with the normal no-load input power (20W).
The method of the invention is adopted to rewind and dip the magnetic core 3 of the transformer, and comprises the following concrete steps:
firstly, a layer of winding 2 is wound on a transformer core 3 according to a winding process. And then, placing the wound part 1 into a beaker, pouring the prepared impregnated rubber material 4 into the beaker, and completely covering the wound part with the impregnated rubber material 4. And then putting the container with the wound part 1 into a vacuum filling machine, vacuumizing and exhausting bubbles, and repeatedly performing operations of vacuumizing → exhausting → vacuumizing until no bubbles with the diameter larger than 2mm are generated in the sizing material. And after the vacuumizing is finished, taking out the wound part 1, hanging the wound part on an airing rack, and airing the wound part for 1-2 h at room temperature. And (4) before the coiled material is placed into an oven, checking whether dripping and hanging glue exists at the bottom of the suspended coiled material. If present, the excess impregnating compound 4 is glued off to a clean polyethylene plastic film. Finally, putting the mixture into an oven, and curing for 4-6 h at 50 +/-5 ℃. Gaps between the windings 2 and the transformer cores 3 and gaps between the windings 2 and the windings 2 are vacuum-impregnated with a heat-conducting glue, so that the impregnating glue 4 is filled between the transformer cores 3 and the windings 2 and between adjacent windings 2 of the transformer cores 3. The high-power wound part is wound in a layered mode and is subjected to layered vacuum impregnation, gaps are filled with heat-conducting glue, and the heat-conducting area is increased. And after the impregnated rubber material 4 is cured, winding a second layer of coil on the surface of the rubber material, and manufacturing layer by layer according to the steps until the design requirement of the wound part is met.
And (4) replacing the transformer after impregnation with a transformer on a prototype product, and then carrying out thermal vacuum test verification. The power supply product runs for 4 hours under the working condition of constant power at 70 ℃, the temperature of the transformer winding is measured actually to be 106.6 ℃, the temperature of the magnetic core is measured actually to be 115 ℃, and various performance indexes of the product meet requirements.
In summary, the invention provides a process method for dipping a wound part by using a heat-conducting rubber material, wherein the dipping rubber material is filled between adjacent windings of a transformer magnetic core to improve the heat-conducting property, the dipping rubber material adopts heat-conducting rubber which is addition type silicon rubber, no solvent is contained in the rubber material, no gas micromolecule is generated in the curing process, the wound part is dipped in the heat-conducting rubber material in vacuum and then filled between the transformer magnetic core and the windings and between the adjacent windings of the transformer magnetic core, air cannot enter between the transformer magnetic core and the windings and between the adjacent windings of the transformer magnetic core, so that the heat-conducting area is increased, and the heat transfer capacity of the wound part is improved.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (8)
1. A process method for impregnating a wound part with a heat-conducting sizing material is characterized by comprising the following steps:
winding the winding (2) on the transformer magnetic core (3) in a ring shape to form a winding part (1); placing the wound part (1) in a beaker, pouring the impregnated rubber material (4) into the beaker, and vacuumizing the beaker to remove air bubbles after the impregnated rubber material (4) covers the wound part (1) in the beaker; and after the vacuumizing is finished, taking the winding part (1) out of the beaker, standing, and heating and curing to enable the impregnated rubber material (4) to be filled between the transformer magnetic core (3) and the winding (2) and between the adjacent windings (2) of the transformer magnetic core (3).
2. The process method for impregnating the wound part with the heat-conducting sizing material according to claim 1, wherein the impregnating sizing material (4) adopts CN-8760 pouring sealant.
3. A process for impregnating wound articles with a thermally conductive compound according to claim 1, wherein the beaker is placed in a vacuum infusion machine for evacuation of air bubbles.
4. A process for impregnating wound articles with a thermally conductive size according to claim 1, characterized in that evacuation of the air bubbles in the impregnating size (4) is completed until the diameter of the air bubbles generated in the impregnating size (4) is less than 2 mm.
5. The process for impregnating wound parts with heat-conductive size according to claim 1, wherein the time for taking out the wound part (1) and standing is 1-2 hours after the completion of the vacuum pumping.
6. A process for impregnating wound articles with heat-conductive size according to claim 1, characterized in that, when there is dripping of the impregnating size (4) on the bottom of the wound article (1) after the evacuation is completed, the excess dripping of the impregnating size (4) is removed by sticking it on the polyethylene plastic film before the wound article (1) is heated.
7. A process for impregnating wound articles with a thermally conductive compound according to claim 1, wherein the heating temperature is 50 ℃ ± 5 ℃.
8. A process for impregnating wound articles with a thermally conductive size according to claim 1, wherein the curing time is 4 to 6 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111006131.7A CN113674992A (en) | 2021-08-30 | 2021-08-30 | Process method for impregnating wound part by using heat-conducting sizing material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111006131.7A CN113674992A (en) | 2021-08-30 | 2021-08-30 | Process method for impregnating wound part by using heat-conducting sizing material |
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| CN113674992A true CN113674992A (en) | 2021-11-19 |
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| CN202111006131.7A Pending CN113674992A (en) | 2021-08-30 | 2021-08-30 | Process method for impregnating wound part by using heat-conducting sizing material |
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