Air passage reserving tool for pouring of high-voltage coil of dry-type transformer and pouring mold

Abstract

The utility model relates to the technical field of dry-type transformers, and particularly discloses an air passage reserving tool for pouring of a high-voltage coil of a dry-type transformer and a pouring mould, the air passage reserving tool comprises a barrier strip and a sealing sheet; the barrier strip is vertically mounted between the inner mold and the annular outer mold, one end of the barrier strip is flush with the bottom plate, and the other end penetrates through the long through hole to extend out of the positioning top plate; a plurality of tightly arranged barrier strips are arranged in each long through hole; the parts, located between the bottom plate and the positioning top plate, of the adjacent blocking strips in the same long through hole are connected in a sealed mode through sealing pieces. According to the air channel reserving tool, the mode of combining the barrier strips and the sealing pieces is adopted, an integral air channel reserving plate is replaced, the mold types can be reduced, the machining period is shortened, materials are saved, the production cost is reduced, the combination mode can be matched with positioning top plates with reserved long through holes in pouring molds of different high-voltage coils, and the production efficiency is improved. Therefore, air channels in different forms are formed after pouring, and the mold has the advantages of being flexible to use and wide in application range.

Description

Technical Field

[0001] This application relates to the field of dry-type transformer technology, and more specifically, to a pre-reserved tooling for air passages and a casting mold for casting high-voltage coils of dry-type transformers. Background Technology

[0002] In the production of high-voltage coils for dry-type transformers, the casting process is one of the key steps. Typically, this process begins with the winding of glass fiber mesh, air duct pre-reserved plates, and high-voltage wires based on an inner mold. Subsequently, the various mold components are assembled into a complete casting mold for casting.

[0003] However, in the configuration of the air passage reserved plate, the air passage reserved plate needs to be processed as a whole according to the air passage size, so that each air passage needs to be configured with a separate whole dedicated air passage reserved plate. This design means that for dry-type transformer high-voltage coils of different sizes and specifications, different specifications of air passage reserved plates must be made to match them. This not only leads to a wide variety of mold types, but also significantly prolongs the mold processing cycle, causing serious material waste and ultimately leading to increased production costs.

[0004] There is currently no effective technical solution to the above problems. Utility Model Content

[0005] The purpose of this application is to provide a pre-reserved tooling and casting mold for the air passage of the high-voltage coil of a dry-type transformer, which can replace the integral air passage pre-reserved plate, reduce the types of molds, shorten the processing cycle, save materials, and reduce production costs.

[0006] In the first aspect, this application provides a pre-reserved tooling for the air passage of the high-voltage coil of a dry-type transformer, which is applied to the casting mold. The casting mold includes a detachable and combinable inner mold, an annular outer mold, a bottom plate and a positioning top plate. The positioning top plate has a plurality of equidistantly arranged elongated through holes.

[0007] The pre-reserved tooling for the air duct of the high-voltage coil of the dry-type transformer includes a barrier strip and a sealing sheet.

[0008] The barrier strip is vertically installed between the inner mold and the annular outer mold, with one end flush with the bottom plate and the other end passing through the elongated hole to extend out of the positioning top plate;

[0009] Each of the elongated through holes is provided with a plurality of closely arranged barrier strips;

[0010] The portions of adjacent barrier strips in the same elongated through hole located between the base plate and the positioning top plate are sealed together by the sealing sheet.

[0011] The air duct pre-reservation tooling for casting high-voltage coils of dry-type transformers in this application adopts a combination of barrier strips and sealing sheets to replace the integral air duct pre-reservation plate. This reduces the types of molds, shortens the processing cycle, saves materials, and reduces production costs. This combination method can be used with positioning top plates with pre-reserved long through holes on casting molds of different high-voltage coils to form air ducts of different shapes after casting. It has the advantages of flexible use and wide applicability.

[0012] The air duct pre-reserved tooling for casting the high-voltage coil of the dry-type transformer includes a sealing sheet with one end flush with the base plate and the other end passing through the elongated hole to extend out of the positioning top plate.

[0013] The above-mentioned sealing strip setting method can ensure that the sealing strip can completely seal the transition part of the adjacent barrier strip in the casting space, which can ensure that the sealing strip plays a good sealing role at the bottom, ensure the integrity of the air channel reserved structure, prevent the leakage of casting material, and ensure the molding quality of the product.

[0014] The aforementioned fixture for pre-reserving air channels for casting the high-voltage coil of the dry-type transformer includes a system in which all the barrier strips in the same long through hole are sealed and connected by two sealing plates. The two sealing plates are respectively pasted and fixed on the side of the barrier strip near the inner mold and the side away from the inner mold.

[0015] The sealing strip forms double protection on both the inner and outer sides of the barrier strip, reducing burr formation and more effectively preventing the casting material from leaking into the air passage reserved space, thus ensuring the integrity and dimensional accuracy of the air passage reserved structure.

[0016] The air duct pre-reserved tooling for casting the high-voltage coil of the dry-type transformer, wherein the portion of the barrier strip extending out of the positioning top plate has a hook hole for demolding.

[0017] The air duct pre-reserved fixture for casting the high-voltage coil of the dry-type transformer, wherein the length of one of the barrier strips in the same long through hole extending out of the positioning top plate is more than twice the length of the remaining barrier strips extending out of the positioning top plate.

[0018] The air duct pre-reserved tooling for casting the high-voltage coil of the dry-type transformer, wherein the centerline length of the elongated through hole is 5-15 times the width of the barrier strip.

[0019] The air duct pre-reserved tooling for casting the high-voltage coil of the dry-type transformer, wherein the width of the elongated through hole is 1.05-1.3 times the thickness of the barrier strip.

[0020] Secondly, this application also provides a casting mold for a dry-type transformer high-voltage coil, including a pre-reserved tooling for a gas channel for casting the dry-type transformer high-voltage coil as provided in the first aspect.

[0021] The casting mold for the high-voltage coil of the dry-type transformer in this application replaces the traditional air duct reserved plate with a pre-reserved tooling for the air duct of the high-voltage coil of the dry-type transformer. By combining barrier strips and sealing sheets, it reduces the types of molds, shortens the processing cycle, saves materials, and reduces production costs. This combination method can be used with the positioning top plate with pre-reserved long through holes on the casting mold of different high-voltage coils to form air ducts of different shapes after casting. It has the advantages of flexible use and wide applicability.

[0022] The casting mold for the high-voltage coil of the dry-type transformer, wherein the positioning top plate has at least two sets of staggered, equidistantly spaced elongated through holes.

[0023] The casting mold for the high-voltage coil of the dry-type transformer, wherein the positioning top plate includes multiple annular plates spliced ​​together internally and externally, and each annular plate has at least one elongated through hole arranged at equal intervals.

[0024] As can be seen from the above, this application provides a pre-reserved tooling for air passages and a casting mold for casting high-voltage coils of dry-type transformers. The pre-reserved tooling for air passages for casting high-voltage coils of dry-type transformers adopts a combination of barrier strips and sealing sheets to replace the integral air passage pre-reserved plate. This can reduce the types of molds, shorten the processing cycle, save materials, and reduce production costs. This combination method can be used with positioning top plates with pre-reserved long through holes on casting molds of different high-voltage coils to form air passages of different shapes after casting. It has the advantages of flexible use and wide applicability. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the pre-reserved tooling for the air channel of the high-voltage coil of the dry-type transformer provided in the embodiments of this application.

[0026] Figure 2 This is a schematic diagram of the casting mold for the high-voltage coil of a dry-type transformer provided in an embodiment of this application.

[0027] Figure 3 This is a top view of the casting mold for the high-voltage coil of a dry-type transformer provided in this application embodiment after removing the barrier strip and sealing sheet.

[0028] Reference numerals: 11, inner mold; 12, annular outer mold; 13, base plate; 14, positioning top plate; 141, long through hole; 21, barrier strip; 22, sealing sheet; 211, hook hole. Detailed Implementation

[0029] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0030] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0031] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows for communication; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0032] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0033] The following disclosure provides many different embodiments or examples for implementing various structures of this invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0034] Firstly, please refer to Figure 1 and Figure 2 Some embodiments of this application provide a pre-reserved tooling for the air passage of the high-voltage coil of a dry-type transformer, which is applied to the casting mold. The casting mold includes a detachable and combinable inner mold 11, an annular outer mold 12, a bottom plate 13 and a positioning top plate 14. The positioning top plate 14 has a plurality of equidistantly arranged elongated through holes 141.

[0035] The pre-reserved tooling for the air channel for casting the high-voltage coil of the dry-type transformer includes a barrier strip 21 and a sealing sheet 22;

[0036] The barrier strip 21 is vertically installed between the inner mold 11 and the annular outer mold 12, with one end flush with the bottom plate 13 and the other end passing through the elongated through hole 141 to extend out of the positioning top plate 14.

[0037] Each through hole 141 is provided with a plurality of closely arranged barrier strips 21;

[0038] The portions of adjacent barrier strips 21 in the same elongated through hole 141 located between the base plate 13 and the positioning top plate 14 are sealed together by a sealing sheet 22.

[0039] Specifically, the casting mold is designed as a detachable and modular structure, consisting of an inner mold 11, an annular outer mold 12, a base plate 13, and a positioning top plate 14, facilitating assembly and disassembly. For example, Figure 1 As shown, due to the structural characteristics of the high-voltage coil, the inner mold 11 is preferably designed as a capsule-shaped structure, so that the cross-section of the final high-voltage coil is also capsule-shaped.

[0040] More specifically, the multiple elongated through holes 141 are equidistantly arranged in a ring, meaning that the multiple through holes are evenly distributed along the circumference of the capsule-shaped structure of the inner mold 11, and the extension direction of the elongated through holes 141 matches the circumference of the capsule-shaped structure.

[0041] More specifically, the positioning top plate 14 is provided with a plurality of elongated through holes 141 arranged in a ring at equal intervals. These elongated through holes 141 provide a position for the installation of the barrier strip 21 and limit the installation of the barrier strip 21.

[0042] More specifically, the air passage pre-reservation fixture mainly includes a barrier strip 21 and a sealing plate 22. The barrier strip 21 is the component that forms the air passage, and the sealing plate 22 is used to ensure the quality of air passage molding. The barrier strip 21 is vertically installed between the inner mold 11 and the annular outer mold 12, with its bottom flush with the base plate 13 and its top passing through the elongated through hole 141 of the positioning top plate 14 and extending out. This installation method ensures the stability of the barrier strip 21 during the casting process. Multiple closely arranged barrier strips 21 are deployed in each elongated through hole 141. By adjusting the number and arrangement of the barrier strips 21, the width and shape of the air passage can be flexibly adjusted to match the elongated through hole 141 and meet the requirements of different specifications. The portion between the base plate 13 and the positioning top plate 141 of adjacent barrier strips 21 in the same elongated through hole 141 is sealed and connected by the sealing plate 22 to prevent the casting material from seeping into the air passage pre-reservation space and to ensure the dimensional accuracy of the air passage.

[0043] More specifically, the barrier strip 21 has a rectangular strip structure, and the sealing sheet 22 has a thin sheet structure.

[0044] More specifically, during the assembly of the casting mold, the operator first winds multiple layers of fiberglass mesh onto the inner mold 11. Then, based on the distribution and size characteristics of the elongated through holes 141, multiple tooling bodies composed of multiple barrier strips 21 and sealing plates 22 are configured. These tooling bodies are then covered on the outer layer of the fiberglass mesh. The positioning top plate 14 is then installed using the cooperation relationship between the barrier strips 21 and the elongated through holes 141, and the distribution position of the barrier strips 21 is adjusted. Then, multiple layers of fiberglass mesh are wound around the outside of the barrier strips 21 to realize the assembly of the pre-reserved tooling for the air passage of the high-voltage coil of the dry-type transformer in this embodiment of the application. After the winding of the entire inner layer substrate of the high-voltage coil is completed, the base plate 13, the inner mold 11, and the annular outer mold 12 are combined for casting. During casting, resin and other casting materials fill the space between the inner mold 11 and the annular outer mold 12, and the pre-reserved air passage is formed at the location of the barrier strips 21. After the casting is completed, the mold is disassembled and the solidified coil is taken out. The air passage formed by the barrier strip 21 is retained inside the coil, realizing the air passage reservation function.

[0045] More specifically, the barrier strip 21 adopts a strip-shaped structure, which is more flexible and adjustable than the integral air passage reserved plate, and can adapt to the air passage requirements of different sizes. The sealing plate 22 is used to seal the gap between adjacent barrier strips 21 to prevent the casting material from seeping into the air passage reserved space, and to ensure the molding quality and dimensional accuracy of the air passage.

[0046] The air duct pre-reservation tooling for casting the high-voltage coil of the dry-type transformer in this embodiment adopts a combination of barrier strip 21 and sealing sheet 22 to replace the integral air duct pre-reservation plate. This can reduce the types of molds, shorten the processing cycle, save materials, and reduce production costs. This combination method can be used with the positioning top plate 14 with pre-reserved long through hole 141 on the casting mold of different high-voltage coils to form air ducts of different shapes after casting. It has the advantages of flexible use and wide applicability.

[0047] It should be noted that both the barrier strip 21 and the sealing sheet 22 are made of flexible materials, so they can be arranged along the extension direction of the through hole 141.

[0048] In some preferred embodiments, one end of the sealing sheet 22 is flush with the base plate 13, and the other end passes through the elongated through hole 141 to extend out of the positioning top plate 14.

[0049] Specifically, the inner mold 11, the annular outer mold 12, the bottom plate 13, and the positioning top plate 14 form a complete casting space. The arrangement of the sealing sheet 22 ensures that the sealing sheet 22 can completely seal the transition part of the adjacent barrier strip 21 in the casting space, ensuring that the sealing sheet 22 has a good sealing effect at the bottom, ensuring the integrity of the air passage reserved structure, preventing the leakage of casting material, and ensuring the molding quality of the product.

[0050] In some preferred embodiments, all the barrier strips 21 in the same elongated through hole 141 are sealed together by two sealing pieces 22, which are respectively attached and fixed to the side of the barrier strip 21 near the inner mold 11 and the side away from the inner mold 11.

[0051] Specifically, two sealing sheets 22 are respectively pasted and fixed on the two sides of the barrier strip 21. Thus, when the pouring operation is carried out, the pouring material is blocked by the barrier strip 21 and the double sealing sheets 22. The sealing sheets 22 form double protection on the inner and outer sides of the barrier strip 21, reducing the generation of burrs and more effectively preventing the pouring material from leaking into the air passage reserved space, ensuring the integrity and dimensional accuracy of the air passage reserved structure.

[0052] More specifically, the sealing sheet 22 can be firmly fixed to the barrier strip 21 by means of adhesive or tape.

[0053] In some preferred embodiments, the portion of the barrier strip 21 extending out of the positioning top plate 14 has a demolding hook hole 211.

[0054] Specifically, considering that there are a large number of barrier strips 21 in the long through hole 141 and they are densely arranged and connected by sealing plate 22, removing the barrier strips 21 becomes inconvenient. The hook hole 211 allows the operator to hook the hook hole 211 with a hook-shaped tool to pull the barrier strip 21, making the removal of the barrier strip 21 more convenient and facilitating the demolding of the air passage of the high voltage coil.

[0055] In some preferred embodiments, the length of one of the barrier strips 21 extending out of the positioning top plate 14 in the same elongated through hole 141 is more than twice the length of the remaining barrier strips 21 extending out of the positioning top plate 14.

[0056] Specifically, in order to facilitate quick differentiation and grabbing of the barrier strips 21, the portions of the barrier strips 21 extending out of the positioning top plate 14 in the same long through hole 141 are set to different lengths. Specifically, the length of the portion of one barrier strip 21 extending out of the positioning top plate 14 is set to more than twice the length of the other barrier strips 21. As a result, the operator can quickly identify the longer barrier strips 21 so as to hook the longer barrier strips 21. Using the initial tension provided by the barrier strip 21, the other barrier strips 21 fixedly connected by the sealing plate 22 can be moved together, thereby completing the demolding operation more quickly and conveniently.

[0057] In some preferred embodiments, the centerline length of the through hole 141 is 5-15 times the width of the barrier strip 21.

[0058] Specifically, the centerline length of the through hole 141 refers to its length along the centerline direction, and the width of the barrier strip 21 refers to its length along the centerline direction of the through hole 141.

[0059] More specifically, the centerline length of the through hole 141 is set to 5-15 times the width of the barrier strip 21, which can effectively accommodate multiple barrier strips 21, making it convenient for operators to configure different numbers of barrier strips 21 according to usage requirements.

[0060] It should be noted that the widths of multiple barrier strips 21 in the same through hole 141 can be the same or different, so that the operator can configure different numbers of barrier strips 21 according to the usage requirements to cast the air passage of the expected size.

[0061] In some preferred embodiments, the width of the elongated through hole 141 is 1.05-1.3 times the thickness of the barrier strip 21.

[0062] Specifically, the width of the through hole 141 refers to its length extending perpendicular to the center line, and the thickness of the barrier strip 21 refers to its length extending perpendicular to the center line of the through hole 141.

[0063] More specifically, in the above design, the width of the elongated through hole 141 is designed to be slightly larger than the thickness of the barrier strip 21, so that the barrier strip 21 can be smoothly inserted into the elongated through hole 141. To ensure the positioning accuracy of the barrier strip 21 within the elongated through hole 141, the thickness of the barrier strip 21 is not designed to be too small. Thus, the sealing sheet 22 can also effectively fill the gap between the barrier strip 21 and the elongated through hole 141, achieving a good airway clearance effect. This dimensional ratio balances the convenience of installation, the accuracy of positioning, and the effectiveness of sealing, ultimately ensuring the quality of the airway clearance.

[0064] Secondly, please refer to Figure 2 and Figure 3 Some embodiments of this application also provide a casting mold for a dry-type transformer high-voltage coil, including a pre-reserved tooling for casting air passages for the dry-type transformer high-voltage coil as provided in the first aspect.

[0065] Specifically, in this embodiment of the application, the casting mold for the high-voltage coil of the dry-type transformer uses a pre-reserved tooling for the casting air passage of the high-voltage coil of the dry-type transformer to replace the traditional air passage reserved plate. By combining the barrier strip 21 and the sealing sheet 22, the number of mold types is reduced, the processing cycle is shortened, materials are saved, and production costs are reduced. This combination method can be used with the positioning top plate 14 with the reserved long through hole 141 on the casting mold of different high-voltage coils to form air passages of different shapes after casting. It has the advantages of flexible use and wide applicability.

[0066] In some preferred embodiments, the positioning top plate 14 has at least two sets of equidistant, circumferentially spaced elongated through holes 141 that are staggered inwards and outwards.

[0067] Specifically, such as Figure 3 As shown, the positioning top plate 14 is provided with at least two layers of elongated through holes 141, indicating that the elongated through holes 141 are divided into inner and outer layers and arranged in a ring on the positioning top plate 14. This means that multiple inner and outer distributed barrier strips 21 and sealing sheets 22 can be placed in the top plate structure, so that the manufactured high-voltage coil has multiple layers of air channels, which are arranged in multiple rings on the high-voltage coil. The inner and outer staggered distribution means that the elongated through holes 141 of different levels are staggered or offset in the horizontal direction, and are not completely aligned. The equidistant ring arrangement means that in each layer of elongated through holes 141, multiple elongated through holes 141 are arranged at equal intervals along the ring direction. As a result, when the cooling gas passes through these staggered air channels in the high-voltage coil, it can more comprehensively cover the high-voltage coil and enhance the cooling effect.

[0068] In some preferred embodiments, the positioning top plate 14 includes a plurality of annular plates joined together internally and externally, each annular plate having at least one set of equidistant elongated through holes 141.

[0069] Specifically, the positioning top plate 14 is designed to consist of multiple annular plates, which are assembled together in an inner-outer splicing manner. As one possible implementation, the annular plates may include an inner annular plate and an outer annular plate, with the inner annular plate located in the central region of the positioning top plate 14 and the outer annular plate surrounding the inner annular plate. The inner and outer annular plates are detachably connected by fasteners, facilitating replacement or adjustment as needed. Elongated through holes 141 on each annular plate are arranged in a ring at equal intervals, forming at least one ring of reserved air passages. Through the structure of the inner and outer spliced ​​annular plates, the positioning top plate 14 is modularized, allowing for flexible replacement or adjustment of some annular plates according to different specifications of dry-type transformer high-voltage coils to adapt to different air passage layouts or size requirements, and also facilitating winding by the mold.

[0070] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0071] The above descriptions are merely some embodiments of this utility model. For those skilled in the art, various modifications and improvements can be made without departing from the inventive concept of this utility model, and all such modifications and improvements fall within the protection scope of this utility model.

Claims

1. A pre-reserved tooling for air passage in the casting of high-voltage coils of dry-type transformers, applied in a casting mold, characterized in that, The casting mold includes a detachable and combinable inner mold, an annular outer mold, a base plate, and a positioning top plate, wherein the positioning top plate has multiple equidistantly arranged elongated through holes. The pre-reserved tooling for the air duct of the high-voltage coil of the dry-type transformer includes a barrier strip and a sealing sheet. The barrier strip is vertically installed between the inner mold and the annular outer mold, with one end flush with the bottom plate and the other end passing through the elongated hole to extend out of the positioning top plate; Each of the elongated through holes is provided with a plurality of closely arranged barrier strips; The portions of adjacent barrier strips in the same elongated through hole located between the base plate and the positioning top plate are sealed together by the sealing sheet.

2. The tooling for pre-reserved air ducts for casting the high-voltage coil of a dry-type transformer according to claim 1, characterized in that, One end of the sealing sheet is flush with the base plate, and the other end passes through the elongated hole to extend out of the positioning top plate.

3. The tooling for pre-reserved air ducts for casting the high-voltage coil of a dry-type transformer according to claim 1, characterized in that, All the barrier strips in the same long through hole are sealed and connected by two sealing plates. The two sealing plates are respectively pasted and fixed on the side of the barrier strip close to the inner mold and the side away from the inner mold.

4. The tooling for pre-reserved air ducts for casting the high-voltage coil of a dry-type transformer according to claim 1, characterized in that, The portion of the barrier strip extending out of the positioning top plate has a hook hole for demolding.

5. The tooling for pre-reserved air ducts for casting the high-voltage coil of a dry-type transformer according to claim 4, characterized in that, The length of one of the barrier strips in the same long through hole that extends beyond the positioning top plate is more than twice the length of the remaining barrier strips extending beyond the positioning top plate.

6. The tooling for pre-reserved air ducts for casting the high-voltage coil of a dry-type transformer according to claim 1, characterized in that, The centerline length of the elongated through hole is 5-15 times the width of the barrier strip.

7. The tooling for pre-reserved air ducts for casting the high-voltage coil of a dry-type transformer according to claim 1, characterized in that, The width of the elongated through hole is 1.05-1.3 times the thickness of the barrier strip.

8. A casting mold for a high-voltage coil of a dry-type transformer, characterized in that, This includes the pre-reserved tooling for the air duct for casting the high-voltage coil of a dry-type transformer as described in any one of claims 1-7.

9. The casting mold for the high-voltage coil of a dry-type transformer according to claim 8, characterized in that, The positioning top plate has at least two sets of equally spaced, staggered, long through holes.

10. The casting mold for the high-voltage coil of a dry-type transformer according to claim 9, characterized in that, The positioning top plate includes multiple annular plates that are spliced ​​together internally and externally, and each annular plate has at least one elongated through hole arranged at equal intervals.

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