A coil injection mold

Abstract

The application relates to the technical field of transformer coil pouring, and discloses a coil pouring mold, which comprises an inner mold and an outer mold, the inner mold is used for winding a coil, the outer mold is sleeved on the outer periphery of the inner mold, a pouring cavity for arranging the coil is formed between the outer mold and the inner mold, at least one middle positioning ring is arranged in the pouring cavity to divide the pouring cavity into at least two containing spaces, the at least one middle positioning ring is in sealed connection with the inner mold and the outer mold, and the at least one middle positioning ring is provided with pouring holes which are in communication with the at least two containing spaces, so that two coils can be produced and poured synchronously by a single mold at a time, and the production efficiency of the coils is improved.

Description

Technical Field

[0001] This utility model relates to the field of transformer coil casting technology, and more specifically, to a coil casting mold. Background Technology

[0002] As a widely used electrical device, the production efficiency and quality of the coils in dry-type transformers have a crucial impact on the overall performance and cost of the transformer. In the traditional production process of dry-type transformer coils, a one-by-one production method is usually adopted. Each coil needs to go through a series of complex processes, including mold assembly, winding, mold closing, casting, and mold removal.

[0003] Specifically, each mold used to produce dry-type transformer coils consists of multiple components, including an inner mold, an outer mold, an upper positioning ring, a lower positioning ring, and a terminal plate. During production, the various components of the mold must first be precisely assembled, followed by coil winding. After winding, the mold is closed, and then a casting process is performed to fix the shape and structure of the coil. Finally, the mold is removed to extract the finished coil. This traditional production method, requiring an independent mold and a complete process for each coil, results in a huge workload and a long production cycle, making it difficult to meet the demands of large-scale production. To increase production speed, multiple molds are typically prepared to produce multiple coils simultaneously. However, this not only increases costs but also consumes significant storage space and management resources.

[0004] Therefore, how to solve the problem that a single mold can only produce a single coil at a time is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0005] In view of this, the purpose of this utility model is to provide a coil casting mold that can produce two coils at a time with a single mold, thereby improving the production efficiency of coils.

[0006] To achieve the above objectives, this utility model provides the following technical solution: A coil casting mold, comprising: Inner mold, used for winding the coil; An outer mold is fitted around the outer periphery of an inner mold, forming a casting cavity with a coil between the outer mold and the inner mold. The casting cavity is provided with at least one middle positioning ring to divide the casting cavity into at least two receiving spaces. The at least one middle positioning ring is sealed to both the inner mold and the outer mold, and the at least one middle positioning ring is provided with a casting hole that connects the at least two receiving spaces.

[0007] Preferably, it also includes a terminal plate, which has a plurality of terminal sockets for forming outgoing terminals. The outer mold has an opening extending along the axial direction in the circumferential direction for mounting the terminal plate. The two ends of the terminal plate are flush with the two ends of the outer mold.

[0008] Preferably, the opening has an outwardly folded edge that extends along the axial direction of the outer mold, and the end face of the terminal plate that contacts the folded edge has a groove for installing a sealing strip that extends along the length of the terminal plate.

[0009] Preferably, at least one of the positioning rings has sealing strips on both its inner and outer circumferences.

[0010] Preferably, both the outer wall of the inner mold and the inner wall of the outer mold are coated with a release agent.

[0011] Preferably, the upper end of the casting cavity is provided with an upper positioning ring, the upper positioning ring is provided with a casting hole, and the lower end of the casting cavity is provided with a lower positioning ring. Both the upper positioning ring and the lower positioning ring are sealed and fitted with the inner mold and the outer mold.

[0012] Preferably, the inner circumference of the inner mold is provided with several reinforcing ribs.

[0013] Preferably, the inner mold includes two plates, the edges of which are provided with flanges that extend along their own axis and fold inward. The flanges of one plate are detachably connected to the flanges of the other plate so that the two plates can be joined together to form a ring structure. The two plates are U-shaped or semi-circular structures.

[0014] Preferably, a connecting strip is provided between the flanges of the two plates, and the connecting strip is sealed to the flanges of the two plates by a sealing strip.

[0015] Preferably, the flanges of the two plates are detachably connected by a fixing clamp, and several fixing clamps are provided.

[0016] The coil casting mold provided by this utility model includes an inner mold and an outer mold. Specifically, the inner mold is used to wind the coil, and the outer mold is fitted around the outer periphery of the inner mold. A casting cavity for setting the coil is formed between the outer mold and the inner mold. The casting cavity is provided with at least one middle positioning ring to divide the casting cavity into at least two receiving spaces. Each receiving space is used to receive one coil, so that a single mold can produce at least two coils at a time, thereby improving the production efficiency of the coil. At least one middle positioning ring is provided with a casting hole that connects at least two receiving spaces, so that the casting medium can flow from one receiving space to another, thereby realizing the casting of at least two coils in multiple receiving spaces at a time. At least one middle positioning ring is sealed to both the inner mold and the outer mold to better isolate the two receiving spaces, avoid casting flash, and reduce the need for grinding of the finished coil after casting.

[0017] The coil casting mold designed in the above manner breaks through the technical limitation that a single mold can only produce a single coil at a time, improves production efficiency, and reduces mold investment costs and warehousing management costs. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of the coil casting mold provided by this utility model; Figure 2 This is a cross-sectional view of the coil casting mold provided by this utility model; Figure 3 This is a top view of the coil casting mold provided by this utility model.

[0020] Figure label: 1-Inner mold, 11-Plate body, 12-Flanged edge; 2-Outer mold, 21-Folded edge; 3-Middle positioning circle; 4-Pour hole; 5-Terminal board, 51-Terminal socket; 6-Upper positioning ring; 7-Lower positioning ring; 8-Reinforcing ribs. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., 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 or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of 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.

[0023] It should be noted that the directional terms such as "upper," "middle," "lower," "inner," and "outer" used below are defined based on the accompanying drawings in the instruction manual.

[0024] The core of this invention is to provide a coil casting mold that can produce two coils at a time with a single mold, thereby improving the production efficiency of coils.

[0025] Please refer to Figure 1 and Figure 2 A coil casting mold includes an inner mold 1 and an outer mold 2.

[0026] Specifically, the inner mold 1 is used to wind the coil, and the outer mold 2 is fitted around the outer periphery of the inner mold 1. A casting cavity for setting the coil is formed between the outer mold 2 and the inner mold 1. The casting cavity is provided with at least one middle positioning ring 3 to divide the casting cavity into at least two receiving spaces. Each receiving space is used to receive one coil, so that a single mold can produce at least two coils at a time, thereby improving the production efficiency of the coil. At least one middle positioning ring 3 is provided with a casting hole 4 that connects at least two receiving spaces, so that the casting medium can flow from one receiving space to another, thereby realizing the effective casting of coils in multiple receiving spaces. At least one middle positioning ring 3 is sealed to both the inner mold 1 and the outer mold 2 to better isolate the two receiving spaces, avoid casting flash, and reduce the need for polishing of the finished coil after casting.

[0027] In this embodiment, one central positioning ring 3 is used to divide the casting cavity into two accommodating spaces, achieving the effect of producing two coils in a single mold at a time. Alternatively, two central positioning rings 3 can be used to divide the casting cavity into three accommodating spaces, achieving the effect of producing three coils in a single mold at a time. In practical applications, the number of central positioning rings 3 is not limited and can be set according to actual conditions. The central positioning ring 3 is used to separate the two coils, automatically separating them after demolding without additional cutting, achieving non-destructive separation of the casting body and avoiding the labor-intensive and dust-related damage caused by traditional cutting processes.

[0028] The coil casting mold designed in the above manner breaks through the technical limitation that a single mold can only produce a single coil at a time, improves production efficiency, and reduces mold investment costs and warehousing management costs.

[0029] In the above embodiment, a terminal plate 5 is also included. The terminal plate 5 is provided with a plurality of terminal sockets 51 for forming outgoing terminals. The outer mold 2 has an opening extending along the axial direction in the circumferential direction. The opening is used to install the terminal plate 5. The two ends of the terminal plate 5 are flush with the two ends of the outer mold 2.

[0030] It should be noted that precise shaping of the coil ends is achieved through the molding surface of the terminal plate 5 and the terminal socket 51. For example, by providing protrusions or recesses (such as wavy surfaces, annular bosses, or annular grooves) on the molding surface of the terminal plate 5, the surface distance between adjacent terminals can be significantly increased, thereby improving the electrical performance of the coil and enabling it to withstand higher applied voltages. During the casting process, the terminal socket 51 on the terminal plate 5 can be designed to be detachable. After the resin is poured and initially cured, the terminal socket 51 can be removed to release the tensile stress on the wire terminals before high-temperature curing. This avoids cracking of the epoxy resin due to asynchronous shrinkage between the epoxy resin and the wire terminals, reducing the risk of epoxy resin deformation and thus improving coil quality. The design of the terminal plate 5 improves the versatility and flexibility of the mold. For example, by using detachable terminal sockets 51 and plugs, the position and quantity of terminals can be adjusted according to the requirements of different coil specifications, reducing inventory and improving production efficiency. A well-designed terminal plate 5 simplifies the coil production process, reducing subsequent grinding and other processes, thereby improving production efficiency. For details regarding the features of terminal block 5, please refer to existing technologies.

[0031] There are no restrictions on the specifications and shape of the terminal block 5, nor on the number, specifications, and arrangement of the terminal heads 51 on the terminal block 5. These can be set according to the actual application.

[0032] Please refer to Figure 1 and Figure 3 The opening is provided with an outwardly folded edge 21, which extends along the axial direction of the outer mold 2. The end face of the terminal plate 5 that contacts the folded edge 21 is provided with a groove for installing a sealing strip, which extends along the length direction of the terminal plate.

[0033] It is understandable that the outer mold 2 is cylindrical in shape. The outer circumference of the outer mold 2 has an opening extending along its own axis. A folded edge 21 is provided at the opening. The folded edge 21 can be fixed with the connecting piece to realize the opening and closing of the outer mold 2. In order to ensure that the folded edge 21 does not interfere with the coil in the casting cavity, the folded edge 21 needs to be set to extend away from the inner mold 1, that is, extend outward, that is, fold outward along the circumference of the outer mold 2 itself.

[0034] In one feasible embodiment, to ensure a sealed connection between the terminal plate 5 and the outer mold 2, grooves for installing sealing strips are provided on the opposite end faces of the terminal plate 5 and the flange 21. The sealing strips provide a seal. Furthermore, to facilitate the positioning of the terminal plate 5, clamps, bolt assemblies, or other connecting components can be used to connect and lock the terminal plate 5 and the flange 21. The above embodiment is only one feasible implementation method; however, other configuration methods can be used in practical applications without limitation.

[0035] Furthermore, at least one of the inner and outer circumferences of the positioning ring 3 is provided with sealing strips.

[0036] It should be noted that the installation of the middle positioning ring 3 requires insertion from the top of the inner mold 1. To prevent the inner wall of the middle positioning ring 3 from rubbing against the outer wall of the inner mold 1, scratching the inner mold 1, or scraping out iron filings that affect the coil quality, a sealing strip is installed on the inner wall of the middle positioning ring 3. This helps the middle positioning ring 3 slide smoothly to the middle position of the inner mold 1. A sealing strip is also installed on the outer wall of the middle positioning ring 3 to ensure a seamless fit with the inner wall of the outer mold 2, guaranteeing complete isolation between the two adjacent receiving spaces. This better isolates the poured resin, allowing the two coils to be easily separated when removing the coil from the mold, preventing resin flash from forming on the finished coil and reducing the need for polishing. The sealing strip is a U-shaped strip to completely enclose both the inner and outer circumferences of the middle positioning ring 3.

[0037] In the above embodiments, both the outer wall of the inner mold 1 and the inner wall of the outer mold 2 are coated with a release agent.

[0038] Understandably, this prevents the cast coil from directly contacting the mold surface, thus avoiding product adhesion to the mold and facilitating product removal. It also reduces friction between the product and the mold, accelerating demolding and improving production efficiency. Furthermore, it reduces scratches and damage to the product surface, improving surface quality and appearance.

[0039] Please refer to Figure 1 , Figure 2 and Figure 3 The upper end of the casting cavity is provided with an upper positioning ring 6, and the upper positioning ring 6 is provided with a casting hole 4. The lower end of the casting cavity is provided with a lower positioning ring 7. Both the upper positioning ring 6 and the lower positioning ring 7 are sealed and fitted with the inner mold 1 and the outer mold 2.

[0040] It should be noted that the inner diameters of the upper positioning ring 6 and the lower positioning ring 7 are the same as the outer diameter of the inner mold 1, and the outer diameters of the upper positioning ring 6 and the lower positioning ring 7 are the same as the inner diameter of the inner mold 1. During use, the lower positioning ring 7 is installed at the lower end of the inner mold 1, and the upper positioning ring 6 is installed at the upper end of the inner mold 1. Since the resin is poured from top to bottom, a pouring hole 4 needs to be made in the upper positioning ring 6 to allow the poured resin to enter the pouring cavity.

[0041] In the above embodiment, the inner circumference of the inner mold 1 is provided with a plurality of reinforcing ribs 8.

[0042] Understandably, adding reinforcing ribs 8 increases the rigidity and strength of the mold, helping to extend its service life and reduce replacement frequency and costs due to mold damage. During use, the mold is subjected to high temperatures and high pressures; reinforcing ribs 8 help resist these effects, preventing mold deformation and ensuring product dimensional accuracy and shape consistency. They also disperse stress generated during mold use, reducing stress concentration areas and lowering the risk of mold cracking, thus improving mold stability, enhancing product molding quality, and reducing product defects.

[0043] There are no restrictions on the number, shape, or arrangement of the reinforcing ribs 8; they can be designed according to the actual application.

[0044] In a preferred embodiment, the inner mold 1 includes two plates 11. The edges of the two plates 11 are provided with flanges 12 that extend along their own axis and fold inward. The flanges 12 of one plate 11 are detachably connected to the flanges 12 of the other plate 11 so that the two plates 11 can be spliced ​​together to form a ring structure. The two plates 11 are U-shaped or semi-circular structures.

[0045] It should be noted that the inner mold 1 is designed as two separable parts to facilitate mold disassembly. The flange 12 design increases the stability of the mold, allowing it to withstand greater pressure during injection molding without deformation, while also providing space and support for the terminal plate 5. The detachable flange 12 connection simplifies the mold assembly and disassembly process, facilitating maintenance and replacement of mold components. The U-shaped or semi-circular plate 11 design allows the mold to adapt to product requirements of different shapes and sizes, increasing the mold's versatility.

[0046] In the above case, a connecting strip is provided between the flanges 12 of the two plates 11, and the connecting strip is sealed to the flanges 12 of the two plates 11 by a sealing strip.

[0047] Understandably, to facilitate mold disassembly, a connecting strip, which can be made of iron, is installed between the flanges 12 of the two plates 11. During mold disassembly, the iron strip is removed first, providing space for the two plates 11 to be disassembled more easily. This allows for quick replacement of damaged parts or cleaning, thereby improving production efficiency and reducing maintenance costs. To ensure a sealed connection between the iron strip and the flanges 12 of the plates 11, a sealing strip is installed. This significantly improves the sealing performance of the mold, prevents resin leakage during injection molding, and ensures the stability of the production process and the quality of the product.

[0048] In the above embodiment, the flanges 12 of the two plates 11 are detachably connected by fixing clamps, and several fixing clamps are provided.

[0049] It should be noted that the detachable connection of the flanges 12 of the two plates 11 via a fixing fixture improves the efficiency of mold assembly and disassembly, reducing damage and waste caused by inconvenient disassembly. This design allows for rapid mold repair or component replacement, reducing downtime and improving overall production efficiency. Furthermore, the detachable connection simplifies mold maintenance and repair, making maintenance easier and improving mold durability and stability, thus reducing costs associated with frequent mold replacements.

[0050] The fixing clamp can be a bolt or nut, or a clamp, etc. There are no restrictions on this, as long as it can achieve the effect of clamping and fixing.

[0051] Taking the production of two coils at a time using a mold as an example, when using it, first align the flanges 12 of the two plates 11, place an iron strip and a sealing strip between the two flanges 12, and then connect and fix them with a fixing clamp. Then, install the lower positioning ring 7 at the lower end of the inner mold 1. After that, wind the first coil on the inner mold 1. After the first coil is wound, install the middle positioning ring 3 on the inner mold 1, and make the lower end of the middle positioning ring 3 contact the first coil. At this time, the middle positioning ring 3 is located in the middle of the inner mold 1. Then, wind the second coil. After that, install the upper positioning ring 6 on the inner mold 1, and make the lower end of the upper positioning ring 6 contact the second coil. Finally, install the outer mold 2 outside the first and second coils, and install the terminal plate 5. Finally, connect and lock the terminal plate 5 and the flange 21 through the connector. This completes the installation process. After installation, the resin is poured from the upper positioning ring 6, so that it flows along the pouring hole 4 of the upper positioning ring 6 into the receiving space of the second coil, and then flows through the pouring hole 4 of the middle positioning ring 3 into the receiving space of the first coil until the pouring process is completed. After pouring, the resin is demolded after other processing steps to obtain the finished product.

[0052] In summary, the coil casting mold provided by this utility model is particularly suitable for coil molding in epoxy resin casting process. It enables the production of two coils in one mold assembly, mold closing and casting, which greatly reduces labor costs, significantly reduces the number of molds required, thereby reducing mold costs, greatly improving production efficiency, shortening the production cycle, making more effective use of the casting furnace space, improving equipment utilization, and is suitable for large-scale production of dry-type transformer coils.

[0053] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0054] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0055] The coil casting mold provided by this utility model has been described in detail above. Specific examples have been used to illustrate the principle and implementation of this utility model. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core idea of ​​this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principle of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A coil casting mold, characterized in that, include: Inner mold (1), the inner mold (1) is used for winding the coil; An outer mold (2) is fitted around the outer periphery of the inner mold (1). A casting cavity for setting the coil is formed between the outer mold (2) and the inner mold (1). At least one middle positioning ring (3) is provided in the casting cavity to divide the casting cavity into at least two receiving spaces. At least one middle positioning ring (3) is sealed to both the inner mold (1) and the outer mold (2). At least one middle positioning ring (3) is provided with a casting hole (4) that connects at least two receiving spaces.

2. The coil casting mold according to claim 1, characterized in that, It also includes a terminal plate (5), which has a plurality of terminal sockets (51) for forming outgoing terminals. The outer mold (2) has an opening extending along the axial direction in the circumferential direction. The opening is used to install the terminal plate (5). The two ends of the terminal plate (5) are flush with the two ends of the outer mold (2).

3. A coil casting mold according to claim 2, characterized in that, The opening is provided with an outwardly folded edge (21), which extends along the axial direction of the outer mold (2). The end face of the terminal plate (5) that contacts the folded edge (21) is provided with a groove for installing a sealing strip, which extends along the length direction of the terminal plate (5).

4. A coil casting mold according to claim 1, characterized in that, At least one of the positioning rings (3) is provided with sealing strips on both its inner and outer circumferences.

5. A coil casting mold according to claim 1, characterized in that, The outer wall of the inner mold (1) and the inner wall of the outer mold (2) are both coated with a release agent.

6. A coil casting mold according to any one of claims 1-5, characterized in that, The upper end of the casting cavity is provided with an upper positioning ring (6), the upper positioning ring (6) is provided with a casting hole (4), the lower end of the casting cavity is provided with a lower positioning ring (7), and the upper positioning ring (6) and the lower positioning ring (7) are sealed to the inner mold (1) and the outer mold (2).

7. A coil casting mold according to claim 1, characterized in that, The inner circumference of the inner mold (1) is provided with several reinforcing ribs (8).

8. A coil casting mold according to claim 7, characterized in that, The inner mold (1) includes two plates (11). The edges of the two plates (11) are provided with flanges (12) that extend along their own axis and fold inward. The flange (12) of one plate (11) is detachably connected to the flange (12) of the other plate (11) so that the two plates (11) can be spliced ​​together to form a ring structure. The two plates (11) are U-shaped or semi-circular structures.

9. A coil casting mold according to claim 8, characterized in that, A connecting strip is provided between the flanges (12) of the two plates (11), and the connecting strip is sealed to the flanges (12) of the two plates (11) by a sealing strip.

10. A coil casting mold according to claim 9, characterized in that, The flanges (12) of the two plates (11) are detachably connected by a fixing clamp, which is provided in several units.

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