Transformer and pouring mold for transformer

Abstract

The utility model relates to the technical field of transformer production equipment, in particular to a transformer and a pouring mold for the transformer. The pouring mold is used for being connected to a protruding disc arranged close to the top of the transformer insulation foundation pillar. Comprising a shell arranged on the outer side of the top of the insulating base column in a sleeving mode and an inner cylinder arranged between the side plate and the insulating base column in a sleeving mode, the shell comprises the side plate and a bottom plate which are connected, the bottom plate is at least partially located below the protruding disc, and the side plate extends upwards from the bottom plate in the extending direction of the insulating base column. The inner cylinder is located above the protruding disc, and a sealed pouring cavity is defined by the inner cylinder, the insulating base column and the shell. The pouring cavity is used for pouring solidifiable insulating liquid so as to form an insulating sleeve which is integrally formed with the insulating base column and wraps the outer side of the top of the insulating base column. According to the utility model, the die for pouring is designed for the insulating part at the output end of the transformer, and the integrally-formed insulating sleeve is poured on the insulating base column, so that the pressure resistance of the transformer is effectively improved.

Description

Technical Field

[0001] This utility model relates to the technical field of transformer production equipment, specifically a transformer and a casting mold for the transformer. Background Technology

[0002] Output insulation components, as a crucial part of the transformer, play a vital role in enhancing its safety during operation. For dry-type transformers, the insulation components can be integrally connected to the transformer body by casting the insulating material using a mold.

[0003] Generally, the higher the withstand voltage requirement of a transformer, the greater the distance the output terminal needs to extend beyond the transformer body to meet the withstand voltage insulation requirements. The connection points between the output terminal insulation components and the transformer body therefore often need to withstand greater stress, which affects the transformer's withstand voltage performance and service life as it is used.

[0004] Therefore, there is a need to provide a transformer and a casting mold for the transformer to at least partially solve the above problems. Utility Model Content

[0005] To avoid and overcome the technical problems existing in the prior art, this utility model provides a transformer and a casting mold for the transformer. This utility model uses a casting molding method to integrally form the insulating sleeve and the insulating base column, thereby effectively increasing the creepage distance.

[0006] To achieve the above objectives, the first aspect of this utility model provides the following technical solution:

[0007] A casting mold for a transformer, the transformer having an output-end insulating component including an insulating base column wrapped around an output-end terminal, the outer surface of the insulating base column having at least one protruding disc protruding radially outward along the insulating base column, the casting mold being used to connect to the protruding disc disposed near the top of the insulating base column, the casting mold comprising: a shell, the shell being sleeved outside the top of the insulating base column, the shell including connected side plates and a bottom plate, the bottom plate being at least partially located below the protruding disc, the side plates being configured to extend upward from the bottom plate along the extension direction of the insulating base column; and an inner cylinder, sleeved between the side plates of the shell and the insulating base column, the inner cylinder being disposed above the protruding disc, the inner cylinder, the insulating base column, and the shell enclosing a sealed casting cavity; wherein, the casting cavity is used to pour a solidifiable insulating liquid to form an insulating sleeve integrally formed with the insulating base column and covering the top of the insulating base column.

[0008] According to this solution, the insulating sleeve and the insulating base column are integrally formed using a casting mold, which significantly increases the creepage distance, improves insulation performance, and eliminates the need to adjust the length of the transformer output extension, thus enhancing the transformer's safety and reliability. The integrally formed structure also ensures a tight bond between the insulating sleeve and the insulating base column, improving overall mechanical strength and durability.

[0009] As a further embodiment of this utility model: the casting mold includes a material leakage annular plate, which is disposed near the top opening of the casting cavity and connected to at least one of the outer shell and the inner cylinder, and the material leakage annular plate is provided with a casting hole.

[0010] According to this scheme, the pouring height of the insulating sleeve can be limited by the material-leaking annular plate, and the insulating liquid can be slowly poured through the pouring hole; when there are multiple pouring holes evenly distributed, the uniformity of the insulating liquid pouring can be further improved and the generation of air bubbles can be reduced.

[0011] As a further embodiment of this utility model: the casting mold further includes a support rod and a connecting rod;

[0012] The support rod is mounted on the top of the outer shell and is connected to the outer shell and / or the inner cylinder. The material leakage annular plate is connected to the support rod through the connecting rod.

[0013] According to this solution, the material leakage ring plate is stably supported on at least one of the outer shell and inner cylinder; the installation and fixing method of the material leakage ring plate can be flexibly selected.

[0014] As a further embodiment of this utility model: the connecting rod is configured to be able to extend and retract relative to the support rod along the extension direction of the insulating sleeve, so that the material leakage annular plate can rise and fall within the casting cavity to adjust the height of the insulating sleeve.

[0015] According to this solution, by controlling the height of the material-discharging annular plate within the casting cavity, the height of the insulating sleeve can be precisely adjusted to meet the production requirements of insulating components with different specifications and requirements. This design improves the flexibility and applicability of the mold, enabling the same mold to produce insulating sleeves of various sizes, thus reducing production costs.

[0016] As a further embodiment of this utility model: the connecting rod is threadedly connected to the support rod and the material leakage annular plate;

[0017] The connecting rod is provided with external threads, the support rod is provided with a first threaded hole, and the material leakage annular plate is provided with a second threaded hole.

[0018] According to this solution, the threaded connection between the support rod and the connecting rod enables stable lifting and lowering of the material-discharging annular plate. This mechanical lifting mechanism is simple to operate, precise to control, and structurally robust, ensuring stability and consistency during the pouring process and improving product quality. The self-locking characteristic of the threaded connection also guarantees the stability of the material-discharging annular plate during the pouring process, preventing displacement caused by vibration or external forces.

[0019] As a further improvement of this utility model: multiple mounting grooves are provided at the top edge of the outer shell, and the support rod engages with the mounting grooves; and / or

[0020] The support rod has two slots that are far apart from each other, and the upper end of the inner cylinder is snapped into the slots.

[0021] According to this solution, the installation and fixing method of the support rod is relatively simple, and the installation groove design allows the support rod to be firmly snapped onto the outer shell, improving the overall stability of the mold; similarly, the snap-fit ​​fixing of the support rod and the inner cylinder can ensure the relative fixation of the inner cylinder and the support rod, ensuring the stability of the casting cavity; the snap-fit ​​fixing method facilitates the installation and disassembly of the support rod.

[0022] As a further embodiment of this utility model: the casting mold further includes an insulating ring plate disposed above the raised disc, the lower port of the inner cylinder is sealed to the insulating ring plate, and the insulating ring plate is used to sleeve and connect to the insulating base column.

[0023] According to this scheme, the insulating ring plate forms part of the casting mold, and after casting, the insulating ring plate becomes part of the transformer output terminal insulation component. Directly sealing the bottom of the inner cylinder with the insulating ring plate reduces the difficulty of mold installation and disassembly, and better ensures the sealing of the casting cavity.

[0024] As a further embodiment of this utility model: the casting mold further includes multiple sets of support components, each support component including a rivet nut fixed to the base plate and a support screw for threaded engagement with the rivet nut, the other end of the support screw being used to abut against the support platform, so that the base plate of the outer shell abuts against the bottom surface of the raised disc.

[0025] According to this solution, by designing multiple sets of support components, the bottom plate of the outer shell can be pressed against the bottom surface of the raised plate, ensuring that the casting mold can be stably supported on a certain support platform and guaranteeing the sealing of the casting cavity.

[0026] As a further embodiment of this utility model: the base plate is constructed in a circular shape, and each set of the support components is arranged in a circular array around the axis of the base plate.

[0027] According to this scheme, the support components are arranged in a circular array around the axis of the base plate. During the casting process, the load on the base plate can be evenly transferred to the support platform through the support components, thereby improving the stability of the mold.

[0028] A second aspect of this invention provides a transformer having an output-end insulating component, including an insulating base column wrapped around an output-end terminal. At least one raised disc protrudes radially outward from the outer surface of the insulating base column. An insulating sleeve covering the outer side of the top of the insulating base column is connected to the raised disc near its top. The insulating sleeve is integrally formed with the raised disc using the casting mold described in the first aspect of this invention. This improves the transformer's withstand voltage performance. Attached Figure Description

[0029] Figure 1 This is a three-dimensional structural diagram of a casting mold for a transformer and a transformer assembly according to a preferred embodiment of the present invention.

[0030] Figure 2 for Figure 1 The diagram shows a cross-sectional view of the casting mold and the transformer as a whole, which illustrates the cast insulating sleeve.

[0031] Figure 3 for Figure 1 A schematic diagram of the assembly structure of the outer shell and support components of the casting mold.

[0032] Figure 4 for Figure 1 A schematic diagram of the disassembled structure of the casting mold.

[0033] In the diagram: 1. Outer shell; 11. Mounting groove; 12. Sub-shell; 121. Ear plate; 122. Connecting hole; 123. Side plate; 124. Base plate; 2. Inner cylinder; 3. Support rod; 31. Slot; 4. Connecting rod; 41. First threaded hole; 42. Second threaded hole; 5. Material leakage ring plate; 51. Casting hole; 6. Support assembly; 61. Press-fit nut; 62. Support screw; 7. Insulating base column; 8. Insulating sleeve; 9. Transformer body; 10. Insulating ring plate. Detailed Implementation

[0034] In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. However, it will be apparent to those skilled in the art that embodiments of the present invention may be practiced without one or more of these details. In other instances, certain technical features well-known in the art have not been described in order to avoid confusion with embodiments of the present invention.

[0035] To fully understand the embodiments of this utility model, a detailed structure will be presented in the following description. Obviously, the implementation of the embodiments of this utility model is not limited to the specific details familiar to those skilled in the art. Preferred embodiments of this utility model are described in detail below; however, in addition to these detailed descriptions, this utility model may have other embodiments and should not be construed as being limited to the embodiments set forth herein.

[0036] It should be understood that the terminology used herein is intended only to describe particular embodiments and is not intended to limit the scope of the invention. The singular forms “a,” “an,” and “the” are also intended to include the plural forms unless the context clearly indicates otherwise. When the terms “comprising” and / or “including” are used in this specification, they indicate the presence of the stated feature, integral, step, operation, element, and / or component, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or combinations thereof. The terms “upper,” “lower,” “front,” “rear,” “left,” “right,” and similar expressions used in this invention are for illustrative purposes only and are not intended to be limiting.

[0037] The ordinal numbers such as "first" and "second" used in this invention are merely identifiers and have no other meaning, such as a specific order. Furthermore, for example, the term "first component" does not imply the existence of "second component," and the term "second component" does not imply the existence of "first component."

[0038] In this document, terms such as “equal” and “same” are not strict mathematical and / or geometric limitations, but also include errors that are understandable to those skilled in the art and permissible in manufacturing or use.

[0039] Unless otherwise stated, the numerical ranges in this document include not only the entire range within its two endpoints, but also the subranges contained therein.

[0040] This utility model provides a transformer and a casting mold for the transformer.

[0041] The specific embodiments of the present invention will be described in more detail below with reference to the accompanying drawings, which show representative embodiments of the present invention and are not intended to limit the present invention.

[0042] Please see Figures 1-4 In this embodiment of the invention, the transformer includes a main body and an output terminal extending outward from the main body. In the illustrated embodiment, the transformer is a dry-type transformer, and the main body of the transformer is formed by casting and encapsulating the transformer coils using a mold and a solidifiable insulating liquid.

[0043] See Figure 1The transformer body 9 can be roughly constructed as a rectangular box. The transformer body 9 can also be designed in other shapes. See [link / reference] Figure 2 The transformer's output terminal is equipped with insulating components, which are also molded using a solidifiable insulating liquid. For example, epoxy resin can be chosen as the material for the insulating liquid.

[0044] Figure 2 In the illustrated embodiment, the transformer includes a rectangular transformer body 9, inside which coils and other components are installed. An output-end insulating component is disposed on the upper surface of the transformer body 9, and includes a cylindrical insulating base 7 that surrounds the output-end terminals. The insulating base 7 is made of epoxy resin. The insulating base 7 is generally cylindrical, and its outer surface has at least one protruding disc that protrudes radially outward along the insulating base 7. The protruding disc is generally disc-shaped; preferably, the protruding disc and the insulating base 7 are coaxially distributed. Figure 2 Only one raised disc is shown in the diagram. When two or more raised discs are provided on the outer surface of the insulating base column 7, they can be spaced apart along the axial direction of the insulating base column 7. For example, the raised discs can be arranged sequentially at equal (or variable) intervals along the axial direction of the insulating base column 7. The raised discs can increase the creepage distance and improve the withstand voltage performance of the transformer.

[0045] See Figure 2 In this embodiment, an insulating sleeve 8 is also connected to the raised disc near the top of the insulating base column 7. The insulating sleeve 8 is integrally formed with the raised disc, thus forming a bowl-shaped structure covering the outer side of the top of the insulating base column 7. This can greatly improve the withstand voltage performance of the transformer without increasing the height of the transformer output terminal.

[0046] Specifically, the insulating sleeve 8 is integrated with the raised disc using the casting mold of this invention. In this embodiment, the casting mold is directly connected to the raised disc at the top of the insulating base column 7 during use.

[0047] See Figures 1 to 4 The casting mold of this utility model includes an outer shell 1 and an inner cylinder 2. The outer shell 1 is fitted onto the outer side of the top of the insulating base column 7. The outer shell 1 includes a side plate 123 and a bottom plate 124 connected to each other. The bottom plate 124 is at least partially located below the raised disc. The side plate 123 is configured to extend upward from the bottom plate 124 along the extending direction of the insulating base column 7. The inner cylinder 2 is fitted between the side plate 123 of the outer shell 1 and the insulating base column 7, and is positioned above the raised disc.

[0048] The inner cylinder 2, the insulating base column 7, and the outer shell 1 enclose and form a sealed casting cavity. Specifically, the sealing of the casting cavity can be achieved by: the sealing connection between the bottom plate 124 of the outer shell 1 and the lower surface of the raised plate, and the sealing connection between the lower port of the inner cylinder 2 and the upper surface of the raised plate.

[0049] After epoxy resin is poured into the sealed casting cavity, the casting body and the raised disc of the insulating base 7 can be connected as one unit. Preferably, the surface of the raised disc that comes into contact with the insulating liquid can be roughened before pouring to ensure the connection strength between the raised disc and the casting body.

[0050] The inner cylinder 2 can be sealed to the upper surface of the raised disc using sealant. See also Figure 2 and Figure 4 In this embodiment, the inner cylinder 2 is sealed to the raised disc via the insulating ring plate 10. During mold installation, the lower end of the inner cylinder 2 and the insulating ring plate 10 are first sealed together, for example, by using sealant; then, the inner cylinder 2 and the insulating ring plate 10 are fitted together onto the insulating base column 7, with the surface of the insulating ring plate 10 in close contact with the upper surface of the raised disc. It is understood that the outer diameter of the insulating ring plate 10 can be designed to be different from the outer diameter of the raised disc.

[0051] See Figure 2 and Figure 4 In the embodiment shown, the casting mold also includes a material-discharging annular plate 5. It can be understood that the position of the material-discharging annular plate 5 can limit the casting height of the insulating sleeve 8.

[0052] The material leakage annular plate 5 is disposed near the top opening of the casting cavity. Preferably, the material leakage annular plate 5 is disposed at a predetermined distance from the top opening of the casting cavity to prevent the insulating liquid from overflowing during the casting process.

[0053] The annular plate 5 for discharging material has pouring holes 51, allowing insulating liquid to be slowly poured into the pouring cavity through the pouring holes 51. Preferably, multiple pouring holes 51 can be evenly arranged on the annular plate 5 to achieve uniform pouring of insulating liquid into the pouring cavity.

[0054] The material-discharging annular plate 5 can be installed and fixed by connecting it to at least one of the outer casing 1 and the inner cylinder 2. See also Figure 1 , Figure 2 and Figure 4 In this embodiment, the material-leaking annular plate 5 is installed and fixed to the outer shell 1 and the inner cylinder 2 by the support rod 3 and the connecting rod 4. Specifically, the support rod 3 is mounted on the top of the outer shell 1 (see...). Figure 1 The support rod 3 is connected to the outer shell 1 and the inner cylinder 2, and the material leakage annular plate 5 is connected to the support rod 3 through the connecting rod 4.

[0055] Preferably, the connecting rod 4 is configured to be able to extend and retract relative to the support rod 3 along the extension direction of the insulating sleeve 8, so that the material leakage annular plate 5 can be raised and lowered within the casting cavity to adjust the height of the insulating sleeve 8.

[0056] Preferably, the connecting rod 4 is threaded to the support rod 3 and the material-discharging annular plate 5. The connecting rod 4 is provided with external threads, the support rod 3 is provided with a first threaded hole 41, and the material-discharging annular plate 5 is provided with a second threaded hole 42. The threaded connection enables stable raising and lowering of the material-discharging annular plate 5. The distance between the material-discharging annular plate 5 and the support rod 3 can be pre-adjusted before pouring.

[0057] See Figure 4 Two mounting grooves 11 are provided at the top edge of the outer casing 1. The two mounting grooves 11 are roughly symmetrically distributed relative to the insulating base post 7. The width of the support rod 3 matches the size of the mounting grooves 11, and the two ends of the support rod 3 are engaged with the mounting grooves 11 to fix the material leakage annular plate 5 and the outer casing 1.

[0058] Furthermore, two slots 31 are provided on the support rod 3, which are far apart from each other. During mold assembly, the upper end of the inner cylinder 2 can be snapped into the slots 31.

[0059] In this embodiment, the support rod 3 is snapped together with the outer shell 1 and the inner cylinder 2, which can ensure the relative fixation between the inner cylinder 2, the outer shell 1 and the support rod 3, and ensure the stability of the casting cavity; the snap-fit ​​fixing method also makes it easier to install and disassemble the mold.

[0060] See Figure 1 and Figure 3 In this embodiment, the casting mold further includes multiple sets of support components 6. Each support component 6 includes a rivet nut 61 and a support screw 62. The rivet nut 61 is fixedly mounted on the bottom surface of the base plate 124. One end of the support screw 62 is threaded into the rivet nut 61, and the other end is used to abut against and support the support platform, ensuring that the casting mold can be stably supported between the support platform and the raised disc, and guaranteeing the sealing of the casting cavity.

[0061] In this embodiment, the base plate 124 is constructed in a circular shape, and the various sets of support components 6 are arranged in a circular array around the axis of the base plate 124. During the casting process, the load on the base plate 124 can be evenly transferred to the support platform through the support components 6, thereby improving the stability of the mold.

[0062] See Figure 4In this embodiment, the outer shell 1 is formed by joining two identical sub-shells 12 together. A lug plate 121 is provided at the joint of the sub-shells 12, and a connecting hole 122 is formed on the lug plate 121. Locking bolts are inserted into the corresponding two connecting holes 122, and cooperate with locking nuts to fix the two sub-shells 12 together, forming the outer shell 1. This split design facilitates the disassembly, assembly, and maintenance of the mold. The design of the lug plate 121 and the connecting hole 122 allows the two sub-shells 12 to be firmly connected together, ensuring the integrity and sealing of the mold. At the same time, it also facilitates the transportation and storage of the mold, reducing logistics costs.

[0063] When assembling the two sub-shells 12, in order to improve the sealing of their connection, a sealant, such as a sealing strip or sealant, is installed at the connection to ensure that there is no leakage during casting.

[0064] The following combination Figures 1 to 4 The assembly process of the casting mold according to the preferred embodiment of this utility model will be described in detail.

[0065] In use, firstly, each support screw 62 in the support assembly 6 is sequentially threaded into the rivet nut 61, and the length of the support screw 62 screwed into the rivet nut 61 is adjusted appropriately so that the sub-shell 12 can be erected on the upper surface of the transformer body 9 through the four-point support, while ensuring that the base plate 124 on the sub-shell 12 is lower than the uppermost protruding plate of the insulating base column 7. Next, the two sub-shells 12 are aligned so that the ear plates 121 on them fit together, and the connecting holes 122 are aligned with each other. Then, the two sub-shells 12 are fixed together by the cooperation of the locking bolts and locking nuts to form a complete outer shell 1. The bottom of the outer shell 1 has a central hole, which is fitted on the outside of the insulating base column 7, and the two base plates 124 that are joined together to form the central hole are located below the uppermost protruding plate of the insulating base column 7. At this point, adjust each support screw 62 to gradually raise the outer casing 1, causing its base plate 124 to press against the lower surface of the raised disc from bottom to top. Simultaneously, adjust the position of the outer casing 1 left and right to ensure that the outer casing 1 and the insulating base post 7 are coaxial. During the adjustment of the outer casing 1, in order to improve the tightness of the fit between the outer casing 1 and the raised disc after positioning, apply a certain amount of sealant to the joint when the central hole abuts against the lower surface of the raised disc from bottom to top, thereby improving the sealing performance of the joint.

[0066] After the outer casing 1 is installed and positioned, the insulating ring plate 10 and the inner cylinder 2 are installed. The insulating ring plate 10 and the inner cylinder 2 can be pre-assembled, and then the insulating ring plate 10 is fitted onto the insulating base column 7 from top to bottom, and pressed downwards onto the upper surface of the uppermost protruding disc of the insulating base column 7. At this time, the protruding disc is clamped between the base plate 124 and the insulating ring plate 10.

[0067] Alternatively, the insulating ring plate 10 can be installed first, followed by fitting the inner cylinder 2 onto the top of the insulating base column 7, with its bottom pressed firmly against the upper surface of the insulating ring plate 10. Simultaneously, the inner cylinder 2 should be roughly adjusted to be coaxial with the outer shell 1 to facilitate the subsequent installation of the material leakage ring plate 5. The width of the material leakage ring plate 5 should approximately match the gap between the inner cylinder 2 and the outer shell 1.

[0068] After determining the relative distance between the material-discharging annular plate 5 and the support rod 3, the two connecting rods 4 are screwed into the first threaded holes 41 at both ends of the support rod 3, and then screwed into the second threaded holes 42 on the material-discharging annular plate 5. At this point, the support rod 3, the connecting rods 4, and the material-discharging annular plate 5 are connected together.

[0069] Furthermore, the material leakage annular plate 5 is installed into the casting cavity formed between the inner cylinder 2 and the outer shell 1, and both ends of the support rod 3 are simultaneously engaged in the two mounting grooves 11 on the side plate 123, and the top edge of the inner cylinder 2 is engaged in the two slots 31 of the support rod 3, thereby completing the installation and fixing of the material leakage annular plate 5, and the inner cylinder 2 and the outer shell 1 are stably supported by the support rod 3.

[0070] Finally, the insulating liquid is poured from the pouring hole 51 of the material leakage annular plate 5 into the pouring cavity.

[0071] After the insulating liquid solidifies, an insulating sleeve 8 can be formed integrally with the top of the insulating base post 7, and at this time, the height of the sleeve opening of the insulating sleeve 8 is higher than the height of the terminal extending out of the insulating base post 7.

[0072] After the insulating liquid solidifies and takes shape, the casting mold (outer shell 1 and inner cylinder 2) can be removed in reverse. The transformer can then be put into the next stage of processing.

[0073] Unless otherwise defined, the technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for descriptive purposes only and is not intended to limit the scope of the invention. Terms such as “set” appearing herein can refer to either one component being directly attached to another component or one component being attached to another component via an intermediary. A feature described in one embodiment may be applied, alone or in combination with other features, to another embodiment, unless that feature is not applicable in that other embodiment or is otherwise stated.

[0074] This utility model has been described through the above embodiments. However, it should be understood that the above embodiments are for illustrative purposes only and are not intended to limit this utility model to the described embodiments. Those skilled in the art will understand that many more variations and modifications can be made based on the teachings of this utility model, and all such variations and modifications fall within the scope of protection claimed by this utility model.

Claims

1. A casting mold for a transformer, the transformer having an output end insulating component including an insulating base post (7) wrapped around an output end terminal, the outer surface of the insulating base post (7) having at least one protruding disc (71) protruding radially outward along the insulating base post (7), the casting mold being used to connect to the protruding disc (71) disposed near the top of the insulating base post (7), characterized in that, The casting mold includes: an outer shell (1) fitted on the outer side of the top of the insulating base column (7), the outer shell (1) including a side plate (123) and a bottom plate (124) connected to each other, the bottom plate (124) being at least partially located below the raised disc (71), the side plate (123) being configured to extend upward from the bottom plate (124) along the extension direction of the insulating base column (7); and an inner cylinder (2) fitted between the side plate (123) of the outer shell (1) and the insulating base column (7), the inner cylinder (2) being disposed above the raised disc (71), the inner cylinder (2), the insulating base column (7) and the outer shell (1) forming a sealed casting cavity; wherein, the casting cavity is used to pour a solidifiable insulating liquid to form an insulating sleeve (8) integrally formed with the raised disc (71) and covering the outer side of the top of the insulating base column (7).

2. The casting mold for a transformer according to claim 1, characterized in that, The casting mold includes a material-discharging annular plate (5), which is located near the top opening of the casting cavity and is connected to at least one of the outer shell (1) and the inner cylinder (2). The material-discharging annular plate (5) has a casting hole (51).

3. A casting mold for a transformer according to claim 2, characterized in that, The casting mold also includes a support rod (3) and a connecting rod (4); the support rod (3) is mounted on the top of the outer shell (1), and the support rod (3) is connected to the outer shell (1) and / or the inner cylinder (2); the material leakage annular plate (5) is connected to the support rod (3) through the connecting rod (4).

4. A casting mold for a transformer according to claim 3, characterized in that, The connecting rod (4) is configured to extend and retract relative to the support rod (3) along the extension direction of the insulating sleeve (8), so that the material leakage annular plate (5) can rise and fall within the casting cavity to adjust the height of the insulating sleeve (8).

5. A casting mold for a transformer according to claim 3, characterized in that, The connecting rod (4) is threaded to the support rod (3) and the material leakage annular plate (5); the connecting rod (4) is provided with external threads, the support rod (3) is provided with a first threaded hole (41), and the material leakage annular plate (5) is provided with a second threaded hole (42).

6. A casting mold for a transformer according to claim 3, characterized in that, The outer shell (1) has multiple mounting grooves (11) at its top edge, and the support rod (3) engages with the mounting grooves (11); and / or the support rod (3) has two slots (31) that are far apart from each other, and the upper end of the inner cylinder (2) is engaged with the slots (31).

7. A casting mold for a transformer according to any one of claims 1-6, characterized in that, The casting mold also includes an insulating ring plate (10) disposed above the raised disc (71), the lower port of the inner cylinder (2) is sealed to the insulating ring plate (10), and the insulating ring plate (10) is used to be sleeved and connected to the insulating base column (7).

8. A casting mold for a transformer according to claim 1, characterized in that, The casting mold also includes multiple sets of support components (6), each support component (6) including a rivet nut (61) fixed to the base plate (124) and a support screw (62) for threaded engagement with the rivet nut (61). The other end of the support screw (62) is used to abut against the support platform so that the base plate (124) of the housing (1) presses against the bottom surface of the raised disc (71).

9. A casting mold for a transformer according to claim 8, characterized in that, The base plate (124) is constructed in a circular shape, and each set of the support components (6) is arranged in a circular array around the axis of the base plate (124).

10. A transformer, characterized in that, The transformer has an output end insulation component, including an insulating base column (7) wrapped around the output end terminal. The outer surface of the insulating base column (7) is provided with at least one protruding disc (71) that protrudes radially outward along the insulating base column (7). The protruding disc (71) located near the top of the insulating base column (7) is connected to an insulating sleeve (8) covering the outer side of the top of the insulating base column (7). The insulating sleeve (8) is integrally formed with the protruding disc (71) by the casting mold described in any one of claims 1 to 9.

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