CN113793748A - Transformer coil and winding method thereof - Google Patents
Transformer coil and winding method thereof Download PDFInfo
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- CN113793748A CN113793748A CN202111129385.8A CN202111129385A CN113793748A CN 113793748 A CN113793748 A CN 113793748A CN 202111129385 A CN202111129385 A CN 202111129385A CN 113793748 A CN113793748 A CN 113793748A
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- 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
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- 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
- H01F27/085—Cooling by ambient air
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- 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
- H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
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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
- H01F41/06—Coil winding
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Abstract
本发明提供了一种变压器线圈和变压器线圈的绕制方法，变压器线圈包括：线圈本体和保护层；线圈本体包括：第一子线圈和第二子线圈，第一子线圈和第二子线圈均为圆筒状结构，第一子线圈设置在第二子线圈圆筒状结构的内部；保护层，包括：外部保护层、内部保护层和至少两个支撑体；至少两个支撑体围绕第一子线圈的外表面设置于第一子线圈和第二子线圈之间，且每两个相邻支撑体之间形成空隙；外部保护层设置于第二子线圈的外侧，内部保护层设置于第一子线圈的内侧；外部保护层和内部保护层于至少两个支撑体的端部连接，以使保护层的端面形成与空隙对应的散热孔。本发明实施例提供的变压器线圈和变压器线圈的绕制方法，提升了变压器线圈的散热能力。
The invention provides a transformer coil and a winding method for the transformer coil. The transformer coil includes: a coil body and a protective layer; the coil body includes: a first sub-coil and a second sub-coil, and the first sub-coil and the second sub-coil are both It is a cylindrical structure, the first sub-coil is arranged inside the cylindrical structure of the second sub-coil; the protective layer includes: an outer protective layer, an inner protective layer and at least two supporting bodies; at least two supporting bodies surround the first sub-coil The outer surface of the sub-coil is arranged between the first sub-coil and the second sub-coil, and a gap is formed between every two adjacent support bodies; the outer protective layer is arranged on the outer side of the second sub-coil, and the inner protective layer is arranged on the first sub-coil. The inner side of a sub-coil; the outer protective layer and the inner protective layer are connected to the ends of the at least two support bodies, so that the end faces of the protective layer form heat dissipation holes corresponding to the gaps. The transformer coil and the winding method of the transformer coil provided by the embodiments of the present invention improve the heat dissipation capability of the transformer coil.
Description
Technical Field
The invention relates to the technical field of transformers, in particular to a transformer coil and a winding method of the transformer coil.
Background
Generally, a wire-wound type coil is used as a coil in a power transformer, but the wire-wound coil has a long winding time, a low manufacturing efficiency, and a poor short-circuit resistance.
To overcome the above problems, foil-wound coils (also called foil coils) can be used instead of the wire-wound coils. The foil-wound coil is formed by winding one or more wires in parallel, and is one of layer-wound coils. The foil coil is characterized in that: the wire is thin and wide copper foil or aluminum foil, and has only 1 turn in the axial direction and multiple turns in the radial direction. The foil-wound coil has the advantages that: the mechanical strength is good, the deformation is not easy, and the short circuit force can be borne; the electric strength is good, and the impact gradient voltage is uniformly distributed; the winding is convenient.
Because the coil has a resistance value inside, the coil can generate heat in the working process of the power transformer, and if the coil temperature is too high due to the heat generation, the normal operation of the transformer can be influenced. The coil in the existing transformer has poor heat dissipation capability.
Disclosure of Invention
In view of the above, embodiments of the present invention provide a transformer coil, which at least partially solves the above technical problems.
In a first aspect, an embodiment of the present invention provides a transformer coil, including:
a coil body and a protective layer;
the coil body includes: the first sub-coil and the second sub-coil are both cylindrical structures, and the central axis directions of the first sub-coil and the second sub-coil are the same; the first sub-coil is arranged inside the cylindrical structure of the second sub-coil;
the protective layer, comprising: an outer protective layer, an inner protective layer, and at least two supports; the at least two supporting bodies are arranged between the first sub-coil and the second sub-coil around the outer surface of the first sub-coil, and a gap is formed between every two adjacent supporting bodies; the outer protective layer is arranged on the outer side of the second sub-coil, and the inner protective layer is arranged on the inner side of the first sub-coil; the external protection layer and the internal protection layer are connected with the end parts of the at least two supporting bodies, so that heat dissipation holes corresponding to the gaps are formed on the end faces of the protection layers.
Optionally, the at least two supporting bodies are uniformly distributed around the outer surface of the first sub-coil in the circumferential direction to form a plurality of gaps; and the heat dissipation holes corresponding to the gaps are uniformly distributed around the first sub-coil in the circumferential direction.
Optionally, the plurality of voids formed by the at least two supports are all the same in shape and size.
Optionally, the gap formed by the at least two supports is circular in cross-section taken perpendicular to the central axis of the first sub-coil.
Optionally, the protective layer is a protective layer formed by a molding process from a liquid insulating material.
Optionally, the number of the coil bodies is multiple, the central axis directions of the coil bodies are on the same straight line, each coil body includes a first end and a second end, and the second end of the previous coil body is connected to the first end of the next coil body along the central axis direction of each coil body, so that the coil bodies are connected in series.
In a second aspect, an embodiment of the present invention provides a winding method of a transformer coil, including:
winding a first sub-coil around the outer surface of the inner die of the winding die; the first sub-coil is of a cylindrical structure; the winding mold comprises: the inner die, the outer die, the first end cover and the second end cover; the inner mold and the outer mold are both cylindrical structures; the central axis directions of the inner mold and the outer mold are the same, and the outer mold is arranged inside the outer mold; the first end cover and the second end cover are respectively arranged at two ends of the inner die and the outer die; a first groove is formed in the side face, close to the second end cover, of the first end cover; a second groove is formed in the side face, close to the first end cover, of the second end cover, and the shape of the first groove is the same as that of the second groove;
placing at least two air channel strips around an outer surface of the first sub-coil; for each air channel strip, two ends of the air channel strip are respectively placed in the first groove of the first end cover and the second groove of the second end cover so as to fix the air channel strip relative to the first sub-coil;
winding a second sub-coil on the outer sides of the at least two air channel strips to form a coil body of the transformer coil; wherein, the second sub-coil is cylindrical structure, the axis direction of first sub-coil with the second sub-coil is the same, the coil body includes: a first sub-coil and the second sub-coil;
immersing the winding die in a liquid insulating material to cast a gap in the winding die with the liquid insulating material;
removing the winding die from the liquid insulating material;
after the liquid insulating material positioned in the winding die is solidified to form a protective layer of the transformer coil, sequentially removing the outer die, the first end cover, the second end cover and the inner die of the winding die, and taking out the at least two air channel strips from the interior of the coil body; wherein the protective layer comprises: an outer protective layer, an inner protective layer, and at least two supports; the at least two supporting bodies are arranged between the first sub-coil and the second sub-coil around the outer surface of the first sub-coil, and a gap is formed between every two adjacent supporting bodies between the first sub-coil and the second sub-coil; the outer protective layer is arranged on the outer side of the second sub-coil, and the inner protective layer is arranged on the inner side of the first sub-coil; the external protection layer and the internal protection layer are connected with the end parts of the at least two supporting bodies, so that heat dissipation holes corresponding to the gaps are formed on the end faces of the protection layers.
Optionally, the immersing the winding mold in a liquid insulating material to pour the gap in the winding mold with the liquid insulating material includes:
and immersing the winding mold into a liquid insulating material in a vacuum environment so as to cast the gap in the winding mold with the liquid insulating material.
Optionally, the at least two airway strips are all the same shape and size.
Optionally, the liquid insulating material is a liquid epoxy resin; the air channel strips are made of polyformaldehyde resin.
In the transformer coil provided by the embodiment of the invention, a gap is formed in the transformer coil in front of the support body arranged between the first sub-coil and the second sub-coil, and meanwhile, the end surface of the protective layer is also provided with the heat radiation holes corresponding to the gap, so that the outside air can enter the coil body of the transformer coil through the heat radiation holes and the gaps corresponding to the heat radiation holes, and therefore, in the working process of the transformer, the heat generated by the coil can be discharged through the inner surface and the outer surface of the coil body, and can be discharged through the gap and the heat radiation holes, and therefore, the heat radiation capability of the transformer coil is improved.
In addition, the existing transformer coil only radiates heat through the inner surface and the outer surface of the coil body, so that the heat radiation capability is poor, the size of the coil body needs to be increased in order to avoid the risk that the test result does not meet the requirement of the test index during the temperature rise test, and the material cost is high. As described above, in the transformer coil according to the embodiment of the present invention, the heat dissipation capability is strong due to the existence of the gap, i.e., the heat dissipation hole, in the coil body, and therefore, the material cost of the transformer coil according to the embodiment of the present invention is lower than that of the existing coil under the same requirement of the temperature rise test index.
Drawings
Some specific embodiments of the present invention will be described in detail hereinafter, by way of illustration and not limitation, with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the drawings:
fig. 1 is a schematic structural diagram of a transformer coil according to an embodiment of the present invention;
fig. 2 is a schematic cross-sectional view of a transformer coil according to an embodiment of the present invention, the cross-sectional view being taken along a direction perpendicular to a central axis of a coil body;
fig. 3 is a schematic flowchart of a winding method of a transformer coil according to an embodiment of the present invention.
List of reference numerals:
10: a coil body; 101: a first sub-coil; 102: a second sub-coil;
20: a protective layer; 201: an outer protective layer; 202: an inner protective layer; 203: a support body;
301: winding a first sub-coil around the outer surface of the inner die of the winding die; the first sub-coil is of a cylindrical structure; the winding mold comprises: the inner die, the outer die, the first end cover and the second end cover;
302: placing at least two air channel strips around an outer surface of the first sub-coil;
303: winding a second sub-coil on the outer sides of the at least two air channel strips to form a coil body of the transformer coil; wherein, the second sub-coil is cylindrical structure, the axis direction of first sub-coil with the second sub-coil is the same, the coil body includes: a first sub-coil and the second sub-coil;
304: immersing the winding die in a liquid insulating material to cast a gap in the winding die with the liquid insulating material;
305: removing the winding die from the liquid insulating material;
306: after the liquid insulating material in the winding die is solidified to form the protective layer of the transformer coil, the outer die, the first end cover, the second end cover and the inner die of the winding die are sequentially detached, and the at least two air channel strips are taken out from the coil body.
Detailed Description
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
It should be understood that the terms "first," "second," and the like as used in the description and in the claims do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. Unless otherwise indicated, "front", "rear", "lower" and/or "upper" and the like are for convenience of description and are not limited to one position or one spatial orientation. The word "comprising" or "comprises", and the like, means that the element or item listed as preceding "comprising" or "includes" covers the element or item listed as following "comprising" or "includes" and its equivalents, and does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect.
The following further describes specific implementation of the embodiments of the present invention with reference to the drawings.
Fig. 1 is a schematic structural diagram of a transformer coil according to an embodiment of the present invention, and fig. 2 is a schematic structural diagram of a cross-section of the transformer coil according to an embodiment of the present invention, the cross-section being taken along a direction perpendicular to a central axis of a coil body. Referring to fig. 1 and 2, the transformer coil includes: a coil body 10 and a protective layer 20;
the coil body 10 includes: the coil comprises a first sub-coil 101 and a second sub-coil 102, wherein the first sub-coil 101 and the second sub-coil 102 are both of cylindrical structures, and the central axis directions of the first sub-coil 101 and the second sub-coil 102 are the same; the first sub-coil 101 is arranged inside the cylindrical structure of the second sub-coil 102;
the protective layer 20 includes: an outer protective layer 201, an inner protective layer 202 and at least two supports 203; the at least two supporting bodies 203 are arranged between the first sub-coil 101 and the second sub-coil 102 around the outer surface of the first sub-coil 101, and a gap is formed between every two adjacent supporting bodies 203; the outer protective layer 201 is arranged on the outer side of the second sub-coil 102, and the inner protective layer 202 is arranged on the inner side of the first sub-coil 101; the outer protection layer 201 and the inner protection layer 202 are connected to the ends of the at least two supports 203, so that heat dissipation holes corresponding to the gaps are formed on the end surfaces of the protection layer 20.
Specifically, the protective layer 20 can insulate not only the conductors around which the coil body 10 is wound, but also the coil body 10 from other non-electrically connected conductors in the transformer. For example, when the coil body 10 is provided with an iron core inside and other metal members are provided around the coil body 10, the protective layer 20 may insulate the coil body 10 from the iron core and other metal members.
In the embodiment of the present invention, in the transformer coil, a gap is formed in front of the supporting body 203 disposed between the first sub-coil 101 and the second sub-coil 102, and meanwhile, heat dissipation holes corresponding to the gap are also formed on the end surface of the protective layer 20, so that external air can enter the interior of the coil body 10 of the transformer coil through the heat dissipation holes and the gap corresponding to the heat dissipation holes, and thus, in the working process of the transformer, heat generated by the coil can be discharged through the inner and outer surfaces of the coil body 10, and simultaneously, can be discharged through the gap and the heat dissipation holes, thereby improving the heat dissipation capability of the transformer coil.
In addition, the existing transformer coil only radiates heat through the inner surface and the outer surface of the coil body, so that the heat radiation capability is poor, the size of the coil body needs to be increased in order to avoid the risk that the test result does not meet the requirement of the test index during the temperature rise test, and the material cost is high. As described above, in the transformer coil according to the embodiment of the present invention, the heat dissipation capability is strong due to the existence of the gap, i.e., the heat dissipation hole, in the coil body 10, and therefore, the material cost of the transformer coil according to the embodiment of the present invention is lower than that of the existing coil under the same requirement of the temperature rise test index.
In the embodiment of the present invention, the number of the supports 203 may be 2, or 2 or more, and when the number of the supports 203 is 2, the corresponding number of the gaps is 2, and when the number of the supports 203 is 2 or more, for example, 3, the number of the gaps is 3. The specific number of the supporting members 203 is not limited in the embodiment of the present invention.
In addition, in the embodiment of the present invention, the distance between the supporting bodies 203 disposed between the first sub-coil 101 and the second sub-coil 102 around the outer surface of the first sub-coil 101 is not limited, for example: the supporting bodies 203 may be distributed evenly circumferentially around the outer surface of the first sub-coil 101, i.e.: so that the spacing distances between the supports 203 are equal, for example: if the number of the supports 203 is 3, the distance between the axes of any two adjacent supports 203 may be set to the same distance value L0; it is also possible to have the supporting bodies 203 circumferentially non-uniformly distributed around the outer surface of the first sub-coil 101, i.e.: the distance between the supports 203 is made different, for example: the number of the struts 203 is 3, the distance between the axes of the first strut 203 and the second strut 203 is set to a distance value L1, the distance between the axes of the second strut 203 and the third strut 203 is set to a distance value L2, and the distance between the axes of the third strut 203 and the first strut 203 is set to a distance value L3, and the values of L1, L2, and L3 are not completely the same.
Optionally, referring to fig. 1 and 2, in an embodiment of the present invention, the at least two supporting bodies 203 are uniformly distributed circumferentially around the outer surface of the first sub-coil 101, forming a plurality of gaps; the heat dissipation holes corresponding to the gaps are evenly distributed around the first sub-coil 101 in the circumferential direction.
In order to improve the heat dissipation capability of the transformer coil, and meanwhile, for the convenience of manufacturing, the supporting body 203 may be circumferentially and uniformly distributed around the outer surface of the first sub-coil 101, that is: so that between every two adjacent supports 203
Since air can pass through the gaps formed between the adjacent supporting bodies 203 to reduce the heat generated from the transformer coil during operation, and the structure of the coil body 10 is symmetrical about the central axis direction thereof, in the case where the number of the supporting bodies 203 is plural, it is possible to uniformly distribute the supporting bodies 203 circumferentially around the outer surface of the first sub-coil 101, that is: the distances between the central axes of two adjacent supporting bodies 203 are equal, so that the heat generated by the coil can be uniformly discharged in the working process of the power transformer, and the local overheating phenomenon in the coil is effectively relieved.
In the embodiment of the present application, the specific shape of the supporting body 203 is not limited, and correspondingly, the shape of the gap formed by at least two supporting bodies 203 is also not limited, for example: a columnar void may be formed, and a cross section taken in a direction perpendicular to the central axis of the coil body 10 may also be any shape, for example: the cross section may be polygonal with rounded corners or corners having a certain curvature, etc. In addition, for convenience of manufacture, the shape and size of each support 203 may be the same, and accordingly, the shape and size of the plurality of voids formed by at least two supports 203 may also be the same.
Optionally, referring to fig. 2, in an embodiment of the present invention, a cross section of the gap formed by the at least two supporting bodies 203 taken in a direction perpendicular to the central axis of the first sub-coil 101 is circular.
When the transformer coil is manufactured, an air channel strip is usually wound between the first sub-coil 101 and the second sub-coil 102 of the coil body 10, then a winding mold including the coil body 10 is immersed in a liquid insulating material, a gap in the winding mold is cast by using the liquid insulating material to form a protective layer, and finally, after the liquid insulating material is solidified, the air channel strip is extracted from the interior of the coil body 10. Therefore, if the cross section of the gap formed by the at least two supporting bodies 203, which is cut along the direction perpendicular to the central axis of the first sub-coil 101, is set to be circular, correspondingly, the cross section of the air channel strip is also circular, so that when the air channel strip is drawn out from the inside of the coil body 10, the used pulling force is smaller, and further, the manufacturing process of the transformer coil is more convenient.
In particular, to further facilitate the extraction of the airway strip from inside the coil body 10, it is also possible to: the radius of the circular cross section of the gap formed by the support 203 is gradually reduced along the central axis of the coil body 10.
Alternatively, in an embodiment of the present invention, the protective layer 20 may be a protective layer formed by a molding process using a liquid insulating material.
Alternatively, in an embodiment of the present invention, the number of the coil bodies 10 may also be multiple, the axes of the coil bodies 10 are on the same straight line, and each coil body 10 includes a first end and a second end, and the second end of the previous coil body 10 is connected with the first end of the next coil body 10 along the axial direction of the coil body 10, so that the coil bodies 10 are connected in series.
An embodiment of the present invention further provides a winding method of a transformer coil, and fig. 3 is a schematic flow chart of the winding method of the transformer coil provided in the embodiment of the present invention, as shown in fig. 3, the method includes the following steps:
The inner die and the outer die are both cylindrical structures; the central axis directions of the inner mold and the outer mold are the same, and the outer mold is arranged inside the outer mold; the first end cover and the second end cover are respectively arranged at two ends of the inner die and the outer die; a first groove is formed in the side face, close to the second end cover, of the first end cover; and a second groove is formed in the side surface, close to the first end cover, of the second end cover, and the shape of the first groove is the same as that of the second groove.
At step 302, at least two airway strips are placed around the outer surface of the first sub-coil 101.
For each air channel strip, two ends of the air channel strip are respectively placed in the first groove of the first end cover and the second groove of the second end cover, so that the air channel strip is fixed relative to the first sub-coil 101.
Wherein, the protection layer 20 includes: an outer protective layer 201, an inner protective layer 202 and at least two supports 203; the at least two supporting bodies 203 are arranged between the first sub-coil 101 and the second sub-coil 102 around the outer surface of the first sub-coil 101, and a gap is formed between every two adjacent supporting bodies 203 between the first sub-coil 101 and the second sub-coil 102; the outer protective layer 201 is arranged on the outer side of the second sub-coil 102, and the inner protective layer 202 is arranged on the inner side of the first sub-coil 101; the outer protection layer 201 and the inner protection layer 202 are connected to the ends of the at least two supports 203, so that heat dissipation holes corresponding to the gaps are formed on the end surfaces of the protection layer 20.
Inside transformer coil, the space has been formed before setting up the supporter between first sub-coil 101 and second sub-coil 102, simultaneously, the terminal surface of protective layer 20 has also formed the louvre that corresponds with above-mentioned space, therefore, the outside air can get into transformer coil's coil body 10's inside through the louvre and the space that corresponds with the louvre, thus, in the transformer working process, the heat that the coil produced, not only can be through the inside and outside surface discharge of coil body 10, simultaneously, can also discharge through above-mentioned space and louvre, therefore, transformer coil's heat-sinking capability has been promoted.
In addition, the existing transformer coil only radiates heat through the inner surface and the outer surface of the coil body, so that the heat radiation capability is poor, the size of the coil body needs to be increased in order to avoid the risk that the test result does not meet the requirement of the test index during the temperature rise test, and the material cost is high. As described above, in the transformer coil according to the embodiment of the present invention, the heat dissipation capability is strong due to the existence of the gap, i.e., the heat dissipation hole, in the coil body 10, and therefore, the material cost of the transformer coil according to the embodiment of the present invention is lower than that of the existing coil under the same requirement of the temperature rise test index.
Optionally, in an embodiment of the present application, the step 304 of immersing the winding mold in a liquid insulating material to cast the gap in the winding mold with the liquid insulating material may be implemented as the following steps:
and immersing the winding mold into a liquid insulating material in a vacuum environment so as to cast the gap in the winding mold with the liquid insulating material.
In order to avoid bubbles generated inside the coil body 10 during the casting process, the casting operation in the present invention may be performed in a vacuum environment, and specifically, the vacuum pumping operation may be performed on the closed space where the winding mold and the liquid insulating material are located, and then the winding mold is immersed in the liquid insulating material, so as to cast the gap in the winding mold with the liquid insulating material.
Optionally, in another embodiment of the present application, the at least two airway strips in step 302 are all the same in shape and size.
In order to improve the manufacturing efficiency of the air channel strips used in the embodiment of the invention, the shapes and the sizes of the air channel strips can be uniformly set.
Alternatively, in another embodiment of the present application, the liquid insulating material in step 304 may be a liquid epoxy resin; correspondingly, the material of the airway strip in step 302 may be polyoxymethylene resin.
Specifically, since the air channel strip needs to be immersed in the liquid insulating material during the manufacturing process of the transformer coil provided by the embodiment of the present invention, and the air channel strip needs to be extracted from the liquid insulating material after the liquid insulating material is solidified, the material of the air channel strip should not be dissolved in the liquid insulating material. Further, in order to facilitate the extraction of the air channel strip, a material with a thermal expansion coefficient higher than that of the liquid insulating material can be selected to manufacture the air channel strip, specifically, when the liquid insulating material can be liquid epoxy resin, because the polyoxymethylene resin is not dissolved with the epoxy resin, and the thermal expansion coefficient of the polyoxymethylene resin is greater than that of the epoxy resin, therefore, the material of the air channel strip can be polyoxymethylene resin, and thus, after the liquid epoxy resin is cured, the shrinkage of the polyoxymethylene resin is greater than that of the support body formed after the liquid epoxy resin is cured, and therefore, a gap can be formed between the support body and the air channel strip manufactured by the polyoxymethylene resin, so that the extraction process of the air channel strip is more labor-saving.
The above are merely examples of the present invention, and are not intended to limit the present invention. Various modifications and alterations to this invention will become apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (10)
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| CN105826059A (en) * | 2016-06-09 | 2016-08-03 | 苏州高精特专信息科技有限公司 | High-overload transformer |
| CN207938427U (en) * | 2018-02-08 | 2018-10-02 | 江苏雄风电气设备有限公司 | A kind of dry-type transformer increasing heat dissipation effect |
| CN111863388A (en) * | 2020-08-25 | 2020-10-30 | 江西大族能源科技股份有限公司 | A three-dimensional wound iron core resin cast dry-type transformer and its manufacturing method |
| CN216212769U (en) * | 2021-09-26 | 2022-04-05 | 广州西门子变压器有限公司 | Transformer coil |
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2021
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| WO2015007432A1 (en) * | 2013-07-17 | 2015-01-22 | Abb Technology Ag | Dry-type transformer coil and dry-type transformer |
| CN105826059A (en) * | 2016-06-09 | 2016-08-03 | 苏州高精特专信息科技有限公司 | High-overload transformer |
| CN207938427U (en) * | 2018-02-08 | 2018-10-02 | 江苏雄风电气设备有限公司 | A kind of dry-type transformer increasing heat dissipation effect |
| CN111863388A (en) * | 2020-08-25 | 2020-10-30 | 江西大族能源科技股份有限公司 | A three-dimensional wound iron core resin cast dry-type transformer and its manufacturing method |
| CN216212769U (en) * | 2021-09-26 | 2022-04-05 | 广州西门子变压器有限公司 | Transformer coil |
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