Transformer

Abstract

The utility model discloses a transformer, and relates to the technical field of transformers, the transformer comprises a transformation assembly, a potting shell, a connecting assembly and a flexible semi-conductive material, the potting shell is provided with an accommodating space for accommodating the transformation assembly and a potting insulating material, the inner wall of the potting shell is provided with a connecting part, the connecting assembly is arranged in the accommodating space, and the flexible semi-conductive material is arranged in the connecting part. And the connecting part is arranged outside the insulating gap and is connected with the outer wall of the outer winding and the connecting part. According to the connecting assembly of the transformer, the position of the outer side winding is limited in an external limiting mode, it is guaranteed that no extra structure exists on the right-facing plane of an electric field between the outer side winding and the inner side winding, introduction of bubbles in insulation gaps is reduced, and the yield and the insulation performance of the transformer are improved; and meanwhile, the flexible semi-conductive material is coated outside the connecting part of the connecting assembly and the outer side winding, so that each coated position of the outer side winding can be kept at the same potential, and the insulating property of the transformer is further improved.

Description

A transformer Technical Field

[0001] This application relates to the field of transformer technology, and more specifically, to a transformer. Background Technology

[0002] For transformers manufactured using vacuum casting technology, an inner limiting device is usually set between the inner and outer windings to maintain the insulation distance between them. However, the setting of this inner limiting device makes it difficult to completely expel the air between the inner and outer windings during potting, resulting in air bubbles. This can seriously affect the insulation performance of the transformer and cause partial discharge at lower voltage levels.

[0003] Therefore, ensuring the insulation performance of transformers has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0004] In view of this, the purpose of this application is to provide a transformer to ensure the insulation performance of the transformer.

[0005] To achieve the above objectives, this application provides the following technical solution:

[0006] A transformer, comprising:

[0007] A transformer assembly, comprising a magnetic core, an inner winding, and an outer winding, wherein the inner winding is wound on the magnetic core, and the outer winding is sleeved on the outside of the inner winding, and an insulating gap exists between the inner winding and the outer winding.

[0008] The potting housing has a receiving space for accommodating the transformer assembly and the potting insulation material, and a connecting part is provided on the inner wall of the potting housing;

[0009] A connecting component is disposed within the receiving space. The connecting component is disposed outside the insulation gap and is connected to the outer wall of the outer winding and the connecting portion. The outer wall of the outer winding includes the outer peripheral sidewall of the outer winding facing away from the inner winding and the axial end face sidewall.

[0010] A flexible semiconductive material is used to cover the connection between the connecting component and the outer winding.

[0011] Optionally, in the above-described transformer, the connection assembly includes a plurality of first connectors, which are connected between the connection portion and the outer wall of the outer winding;

[0012] The first connector is wound and connected to the outer winding and / or the connecting portion through the flexible semi-conductive material, and the flexible semi-conductive material covers the connection portion between the first connector and the outer winding.

[0013] Optionally, in the above-described transformer, the connection assembly includes a plurality of second connectors, the first end of the second connector is connected to the outer wall of the outer winding, and the flexible semiconductive material covers the connection portion between the second connector and the outer winding. The second end of the second connector is connected to the connection portion, and in the vertical direction, the first end of the second connector is located below the second end of the second connector.

[0014] Optionally, in the above-mentioned transformer, the connection assembly includes a plurality of third connectors, the first end of the third connector is connected to the outer wall of the outer winding, and the flexible semiconductive material covers the connection portion between the third connector and the outer winding. The second end of the third connector is connected to the connection portion, and in the vertical direction, the first end of the third connector is located above the second end of the third connector.

[0015] Optionally, in the above-mentioned transformer, the connecting part has a hook-shaped structure and is provided with a hanging groove, and the connecting component is hooked and connected to the hanging groove.

[0016] Optionally, in the above-mentioned transformer, the connection assembly includes a plurality of fourth connectors, the fourth connectors are connected to the mounting slot, and the two ends of the fourth connectors are connected to the same or different positions of the outer wall of the outer winding, and the flexible semi-conductive material covers the connection part between the fourth connector and the outer winding.

[0017] Alternatively, the connection assembly includes a plurality of fifth connectors, the first end of the fifth connector being provided with a hook hole, the hook hole being hooked and connected to the hook groove, the second end of the fifth connector being connected to the outer wall of the outer winding, and the flexible semi-conductive material covering the connection part between the fifth connector and the outer winding.

[0018] Optionally, in the above-described transformer, the flexible semiconductive material covers the entire outer wall of the connecting assembly.

[0019] Optionally, in the above-described transformer, the outer winding is one or more, and the connecting component is one or more corresponding to the outer winding.

[0020] Optionally, in the above-mentioned transformer, a magnetic core limiting groove is provided in the receiving space for embedding the magnetic core and limiting the magnetic core.

[0021] The magnetic core limiting groove is constructed on the inner wall of the potting housing; or, the transformer further includes a limiting component, which itself is provided with the magnetic core limiting groove or together with the inner wall of the potting housing to form the magnetic core limiting groove.

[0022] Optionally, in the above-mentioned transformer, the part of the magnetic core limiting groove that is in contact with the magnetic core is configured as a concave-convex structure, the convex part of the concave-convex structure is used to connect with the outer wall of the magnetic core, and the concave part of the concave-convex structure is used to form an exhaust gap with the magnetic core;

[0023] Alternatively, there may be an assembly gap between the magnetic core limiting groove and the magnetic core.

[0024] The transformer provided in this application includes a transformer assembly, a potting housing, a connecting assembly, and a flexible semiconducting material. The transformer assembly includes a magnetic core, an inner winding, and an outer winding. The inner winding is wound on the magnetic core, and the outer winding is sleeved on the outside of the inner winding, with an insulation gap between the inner and outer windings. The potting housing has a receiving space for accommodating the transformer assembly and the potting insulation material. A connecting part is provided on the inner wall of the potting housing. The connecting assembly is disposed within the receiving space and outside the insulation gap for connecting with the outer wall of the outer winding and the connecting part. The outer wall of the outer winding includes an outer peripheral sidewall facing away from the inner winding and an axial end face sidewall. Once the transformer is assembled, the magnetic core can be directly placed or confined within the receiving space, thus determining the position of the inner winding. The connecting assembly is positioned outside the insulation gap and defines the position of the outer winding. This allows the outer winding to be fixed and maintained within the receiving space without the support of the inner winding and the magnetic core, while maintaining the required insulation gap with the inner winding, facilitating subsequent potting and encapsulation. A flexible semi-conductive material covers the connection points between the connecting assembly and the outer winding.

[0025] Compared to related technologies, the transformer connection assembly provided in this application uses an external limiting method to restrict the position of the outer winding, ensuring that there are no additional structures on the plane directly opposite the electric field between the outer and inner windings, reducing the introduction of air bubbles in the insulation gap, and improving the yield and insulation performance of the transformer. At the same time, by covering the connection part between the connection assembly and the outer winding with flexible semi-conductive material, this application can keep all covered positions of the outer winding at the same potential, further improving the insulation performance of the transformer, and has the advantages of simple structure and low production cost. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments or related technologies of this application, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 is a schematic diagram of the structure of the first type of transformer disclosed in the embodiment of this application;

[0028] Figure 2 is a schematic diagram of the connection structure between the first type of transformer and the outer winding disclosed in the embodiment of this application;

[0029] Figure 3 is a schematic diagram of the structure of the second type of transformer disclosed in the embodiment of this application;

[0030] Figure 4 is a cross-sectional view of section AA in Figure 3;

[0031] Figure 5 is a schematic diagram of the structure of the third type of transformer disclosed in the embodiments of this application;

[0032] Figure 6 is a structural schematic diagram of the fourth type of transformer disclosed in the embodiments of this application;

[0033] Figure 7 is a structural schematic diagram of the fifth type of transformer disclosed in the embodiments of this application;

[0034] Figure 8 is a structural schematic diagram of the sixth type of transformer disclosed in the embodiments of this application;

[0035] Figure 9 is a structural schematic diagram of the seventh type of transformer disclosed in the embodiments of this application;

[0036] Figure 10 is a cross-sectional view of section BB in Figure 9;

[0037] Figure 11 is a schematic diagram of the connection structure between the eighth type of transformer and the outer winding disclosed in the embodiments of this application;

[0038] Figure 12 is a schematic diagram of the connection structure between the eighth type of transformer and the outer winding disclosed in the embodiments of this application;

[0039] Figure 13 is a schematic diagram of the transformer structure disclosed in an embodiment of this application;

[0040] Figure 14 is a schematic diagram of the installation structure of the connecting part and the potting shell disclosed in the embodiment of this application;

[0041] Figure 15 is a partial structural schematic diagram of the fourth connector disclosed in the embodiments of this application.

[0042] Among them, 100 is the potting shell, 101 is the accommodating space, 102 is the inner side wall, 103 is the inner bottom wall, 110 is the connecting part, 111 is the hanging groove, 120 is the limiting component, and 121 is the magnetic core limiting groove.

[0043] 200 is the connecting component, 210 is the second connector, 220 is the third connector, 230 is the sixth connector, 240 is the seventh connector, 250 is the fourth connector, 260 is the fifth connector, and 261 is the mounting hole;

[0044] 300 is the transformer assembly, 310 is the magnetic core, 320 is the inner winding, and 330 is the outer winding. Detailed Implementation

[0045] The core of this application is to disclose a transformer that ensures the insulation performance of the transformer.

[0046] Hereinafter, embodiments will be described with reference to the accompanying drawings. Furthermore, the embodiments shown below do not limit the scope of the utility model as described in the claims. Additionally, the complete contents of the structures represented in the embodiments below are not limited to those necessary for the solution of the utility model as described in the claims. It should be noted that, for ease of description, only the parts relevant to the utility model are shown in the drawings. Unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0047] Referring to Figures 1, 2, and 4, the transformer disclosed in this application includes a transformer assembly 300, a potting housing 100, a connecting assembly 200, and a flexible semi-conductive material. Referring to Figure 13, in the embodiments of this application, the transformer assembly 300 refers to the core functional component of the transformer, which is used to realize the step-up or step-down function. It includes a magnetic core 310, an inner winding 320, and an outer winding 330. The inner winding 320 is usually tightly wound on the magnetic core 310, which is equivalent to the inner winding 320 being directly fixed on the magnetic core 310. The inner winding 320 and the magnetic core 310 maintain the same potential. The outer winding 330 is sleeved on the outside of the inner winding 320 and is coaxially arranged with the inner winding 320. A preset insulation distance is set between the inner winding 320 and the outer winding 330 according to the insulation requirements. The space between the inner winding 320 and the outer winding 330 is defined as the insulation gap below. Depending on the specific function of the transformer, one of the inner winding 320 and the outer winding 330 is used as the primary winding, and the other is used as the secondary winding. This application does not limit this.

[0048] The potting housing 100 is provided with a receiving space 101 for accommodating the transformer assembly 300 and the potting insulation material. The potting housing 100 disclosed in this application embodiment is used as a vacuum filling mold for the transformer assembly 300. After vacuum filling is completed, there is no need for mold preheating, demolding and secondary curing steps. The transformer can be directly used as the outer shell of the transformer assembly 300, thereby greatly improving production efficiency and reducing the production cost of the transformer.

[0049] A connecting portion 110 is provided on the inner wall of the potting housing 100. A connecting assembly 200 is disposed within the receiving space 101 and outside the insulation gap, for connecting with the outer wall of the outer winding 330 and the connecting portion 110. The outer wall of the outer winding 330 includes the outer peripheral sidewall facing away from the inner winding 320 and the axial end face sidewall. When the transformer is assembled, the magnetic core 310 can be directly placed or positioned within the receiving space 101 to determine the position of the inner winding 320. The connecting assembly 200 is disposed outside the insulation gap and positions the outer winding 330, allowing the outer winding 330 to be fixed and maintained within the receiving space 101 without the support of the inner winding 320 and the magnetic core 310, and maintaining the required insulation gap with the inner winding 320, facilitating subsequent potting and encapsulation.

[0050] A flexible semi-conductive material is used to cover the connection area between the connecting component 200 and the outer winding 330. The types of flexible semi-conductive materials include, but are not limited to, semi-conductive paper, carbon nanotube paper, metal fiber paper, and flexible nanocomposite materials. This material can be wrapped around the connection area between the connecting component 200 and the outer winding 330. The flexible semi-conductive material has a uniform electric field effect, which can keep any structural dead zones that may exist at the connection area between the connecting component 200 and the outer winding 330 at the same potential, thereby reducing the occurrence of partial discharge in the transformer.

[0051] For example, the connecting component 200 may include a plurality of support bars made of insulating material, with the two ends of the support bars connected to the connecting part 110 and the outer winding 330 respectively. The connecting component 200 and the outer wall of the outer winding 330 may be connected by winding, bonding or other means. The connecting component 200 and the connecting part 110 may be connected by snap-fit, bonding or hanging or other means.

[0052] In related technologies, the inner limiting component is placed at the insulation gap, which introduces air into the plane facing the electric field between the inner winding 320 and the outer winding 330, causing a decrease in the transformer's insulation performance. Compared to related technologies, the transformer connection assembly 200 disclosed in this application uses an external limiting method to limit the position of the outer winding 330, ensuring that there are no additional structures on the plane facing the electric field between the outer winding 330 and the inner winding 320, reducing the introduction of air bubbles into the insulation gap, and improving the transformer's yield and insulation performance. At the same time, by covering the connection part between the connection assembly 200 and the outer winding 330 with flexible semiconductive material, this application can keep all covered positions of the outer winding 330 at the same potential, further improving the transformer's insulation performance, and has the advantages of simple structure and low production cost.

[0053] The aforementioned connecting component 200 and potting housing 100 are both made of insulating materials such as plastic. Specifically, the potting housing 100 can be a cylindrical structure, a cubic structure, or other structures. Taking a cubic structure as an example, referring to Figures 1 and 4, the potting housing 100 has an opening on one side for installing the transformer component 300 and the potting insulating material. The potting housing 100 has an inner bottom wall 103 and four inner side walls 102. The inner bottom wall 103 and the four inner side walls 102 together form an accommodating space 101. The connecting part 110 can be provided on the inner bottom wall 103 and / or the inner side walls 102. Taking the arrangement direction during potting as an example, the opening of the potting housing 100 faces upward, and the inner bottom wall 103 is located below the inner side wall 102. Typically, within the receiving space 101, the side of the magnetic core 310 with the inner winding 320 is close to the opening of the potting housing 100, while the side without the inner winding 320 can be directly placed on the inner bottom wall 103 of the potting housing 100 to facilitate the arrangement of the transformer assembly 300 and the outgoing wires of the inner winding 320 and the outer winding 330. Alternatively, the transformer assembly 300 can also be arranged within the receiving space 101 in the manner shown in Figures 11 and 12 or in other ways. This embodiment does not limit this arrangement, and the methods for fixing the position of the outer winding 330 within the receiving space 101 in different arrangements can be referred to mutually.

[0054] In some embodiments disclosed in this application, the connecting assembly 200 includes a plurality of first connectors. The first connectors are wound and connected to the outer winding 330 via a flexible semi-conductive material. That is, in this embodiment, the flexible semi-conductive material serves both to connect the connecting assembly 200 and the outer winding 330, and to maintain equipotential at the connection points of the first connectors and the outer winding 330. Specifically, taking a support strip as the first connector and semi-conductive paper as the flexible semi-conductive material as an example, during assembly, semi-conductive paper is first wound around the support strip. After winding, the semi-conductive paper continues to extend from the connection point between the support strip and the outer winding 330 and wind around the outer winding 330, thereby achieving a reliable connection between the support strip and the outer winding 330. Simultaneously, the first connectors and the connecting portion 110 can also be wound and connected via flexible semi-conductive material. The first connectors can be arranged at equal intervals around the circumference of the outer winding 330 or symmetrically arranged relative to the center line of the outer winding 330 to ensure the uniformity of force on the outer winding 330.

[0055] In a further embodiment, the flexible semiconductive material can also cover the entire outer wall of the connecting component 200, so that even if the connecting component 200 itself has bubbles or other defects, they are all wrapped within the flexible semiconductive material at the same potential. This avoids the degradation of the transformer's insulation performance due to the defects of the connecting component 200 itself, and at the same potential, it also keeps the connecting component 200 as a whole and the outer winding 330 as a whole at the same potential. For example, the semiconductive paper can completely wrap the outer winding 330 itself and the support strip, with no additional structure between different potential points, reducing the possibility of bubble formation and greatly improving the yield and insulation capability of the transformer.

[0056] When the connecting component 200 and the outer winding 330 are connected by wrapping and winding with a flexible semi-conductive material, in order to facilitate the winding of the flexible semi-conductive material around the outer winding 330 and the connecting component 200, in the actual molding process, the transformer component 300 and the connecting component 200 can be connected as a whole outside the potting shell 100 first, and then the connecting component 200 and the transformer component 300 can be arranged together in the receiving space 101, and the connecting component 200 and the connecting part 110 can be fixed.

[0057] Referring to Figure 5, in some embodiments disclosed in this application, the connecting assembly 200 includes a plurality of second connectors 210. The first end of each second connector 210 is connected to the outer wall of the outer winding 330. A flexible semi-conductive material covers the connection portion between the second connector 210 and the outer winding 330. The second end of each second connector 210 is connected to the connecting portion 110. Vertically, the first end of each second connector 210 is located below the second end of the second connector 210. That is, the outer winding 330 can be suspended within the potting housing 100 via the second connectors 210, thereby maintaining the fixed position of the outer winding 330 and the insulation gap between the outer winding 330 and the inner winding 320. By adjusting the suspension point of the second connector 210 relative to the outer winding 330, it can be ensured that the outer winding 330 remains stably suspended under gravity, resulting in a simple and reliable structure. In this embodiment, the second connector 210 is typically connected to the connecting portion 110 located on the inner wall 102 of the potting housing 100.

[0058] In other embodiments, referring to FIG. 5, the connecting assembly 200 includes a plurality of third connectors 220. The first end of each third connector 220 is connected to the outer wall of the outer winding 330. A flexible semi-conductive material covers the connection portion between the third connector 220 and the outer winding 330. The second end of each third connector 220 is connected to the connecting portion 110. Vertically, the first end of each third connector 220 is positioned above the second end of the third connector 220, thus supporting and limiting the outer winding 330. The third connector 220 can be a support bar, support column, or other structure. Multiple third connectors 220 together form a support structure for the outer winding 330, ensuring reliable limitation of the outer winding 330. In this embodiment, the third connector 220 can be connected to the connecting portion 110 located on the inner sidewall 102 or the connecting portion 110 on the inner bottom wall 103 of the potting housing 100.

[0059] Taking the third connector 220 as a support column as an example, referring to Figure 6, the connecting part 110 can be a connecting groove. The first end of the support column is embedded in the connecting groove to fix its position, and the second end is connected to the outer wall of the outer winding 330, providing support and vertical position limitation for the outer winding 330. Furthermore, a limiting groove can be provided at the second end of the support column, into which the outer winding 330 can be embedded, further limiting its horizontal position. This structure is simple, the limiting is reliable, and each sidewall of the limiting groove can be a planar structure or a curved surface structure adapted to the outer peripheral sidewall of the outer winding 330. Specifically, there can be two or more support columns, arranged symmetrically relative to the outer winding 330. Additionally, to avoid affecting the molding of the magnetic core 310, the two support columns can be arranged near the two horizontally opposite inner sidewalls 102. During molding, the magnetic core 310 can pass between the two support columns and be placed in the receiving space 101. This embodiment does not limit the number of support columns. When the third connector 220 is a support bar, referring to Figure 7, the connecting part 110 can be a support block structure, and a groove is formed between it and the inner sidewall 102 of the potting housing 100, and the support bar can be engaged and fixed with the groove.

[0060] Referring to Figures 1 and 2, taking the arrangement direction during potting as an example, a technical solution is shown where a second connector 210 and a third connector 220 are connected diagonally above and below the outer winding 330, respectively. The second connector 210 exerts an upward pulling force on the outer winding 330, and the third connector 220 exerts an upward supporting force on the outer winding 330, ensuring the fixation of the outer winding 330 in the vertical direction. At the same time, the second connector 210 and the third connector 220 generate a horizontal pulling force on the outer winding 330, which can fix the outer winding 330 in the horizontal direction and effectively prevent the displacement of the outer winding 330 during vacuum potting.

[0061] The connecting component 200 and the connecting part 110 can be connected by snap-fit, adhesive, or hook-fit. Referring to Figure 14, taking the hook-fit method as an example, the connecting part 110 can be a hook-shaped structure with a hook groove 111. The connecting component 200 is hooked to the hook groove 111, making assembly and disassembly convenient. The connecting component 200 can be hooked to the hook groove 111 in various ways. For example, in some embodiments, referring to Figure 1, the connecting component 200 includes multiple fourth connecting members 250. Each fourth connecting member 250 is a U-shaped strip structure with its middle portion bent to bring its two ends closer together. The middle portion of the fourth connecting member 250 is hooked to the hook groove 111. The two ends of the fourth connecting member 250 are connected to the same or different positions on the outer wall of the outer winding 330. A flexible semi-conductive material covers the fourth connecting member 250 and... Outside the connection portion of the outer winding 330; in other embodiments, referring to Figure 15, the connecting assembly 200 includes multiple fifth connectors 260. Each fifth connector 260 is a straight strip structure. The first end of each fifth connector 260 has a hook hole 261 that connects to a hook groove 111. The second end of each fifth connector 260 is connected to the outer wall of the outer winding 330. A flexible semi-conductive material covers the connection portion between the fifth connector 260 and the outer winding 330. The structure is simple and easy to install. Specifically, the fourth connector 250 and the fifth connector 260 can be hook-shaped support bars or other structures.

[0062] In some embodiments, referring to Figures 3 and 4, the connecting assembly 200 includes a plurality of sixth connectors 230, which are connected to the outer peripheral sidewall of the outer winding 330 and the connecting portion 110. In other embodiments, referring to Figures 9 and 10, the connecting assembly 200 includes a plurality of seventh connectors 240, which are connected to the axial end face sidewall of the outer winding 330 and the connecting portion 110. That is, the connecting assembly 200 can specifically be connected to the outer peripheral sidewall or the axial end face sidewall of the outer winding 330. In addition, the connecting assembly 200 can also be connected to both the outer peripheral sidewall and the axial end face sidewall of the outer winding 330 simultaneously to ensure the reliability of the position definition of the outer winding 330.

[0063] The number of outer windings 330 in a transformer assembly 300 can be one or more, and the connecting assemblies 200 are one or more corresponding to the outer windings 330. For example, referring to Figures 3 and 4, when there is only one outer winding 330, the connecting assembly 200 is one corresponding to that outer winding 330; referring to Figures 11-13, when there are two outer windings 330, there are also two connecting assemblies 200, which respectively limit the two outer windings 330. The structure of different connecting assemblies 200 and the limiting method of the outer windings 330 can be the same or different, and the arrangement is flexible.

[0064] Since the inner winding 320 is mainly fixed in position by the magnetic core 310, and the shape of the magnetic core 310 is not fixed, if the surface of the magnetic core 310 that is used to contact the inner bottom wall 103 of the potting housing 100 is a planar structure, the magnetic core 310 can be placed vertically inside the potting housing 100 and its position can be determined; if the surface of the magnetic core 310 that is used to contact the inner bottom wall 103 of the potting housing 100 is a curved structure and cannot be stably placed inside the potting housing 100, then the magnetic core 310 needs to be fixed in position and limited.

[0065] Specifically, in some embodiments, a core-limiting groove 121 is provided within the receiving space 101 for embedding and positioning the magnetic core 310. The core-limiting groove 121 determines the position of the inner winding 320 and ensures the fixation of the insulation gap between the outer winding 330 and the inner winding 320. Referring to Figure 8, the core-limiting groove 121 can be directly constructed on the inner wall of the potting housing 100, resulting in a simple structure and convenient manufacturing.

[0066] In other embodiments, referring to FIG5, the transformer further includes a limiting component 120, which itself is provided with a core limiting groove 121 or together with the inner wall of the potting housing 100 to form a core limiting groove 121. For example, referring to FIG3 and FIG4, the limiting component 120 includes multiple limiting posts, and each limiting post together with the inner wall of the potting housing 100 forms a core limiting groove 121 for limiting the magnetic core 310. The structure is simple and low in cost, and the contact area between the core limiting groove 121 and the magnetic core 310 is small, which facilitates venting. In addition, the limiting component 120 and the potting housing 100 can be directly manufactured into an integral structure by injection molding, which improves the production efficiency of the transformer.

[0067] In a further embodiment, to facilitate air venting during potting at the contact points between the connecting assembly 200 and the outer winding 330, reducing bubble formation, as shown in Figure 8, the portion of the magnetic core limiting groove 121 that contacts the magnetic core 310 has a concave-convex structure. The protruding part of the concave-convex structure connects with the outer wall of the magnetic core 310, and the concave part forms an venting gap with the magnetic core 310, allowing air to pass through and reducing bubble formation during potting. The form of this concave-convex structure includes, but is not limited to, a wavy structure, a triangular sawtooth structure, or a quadrilateral sawtooth structure. Alternatively, the magnetic core limiting groove 121 and the magnetic core 310 may have an assembly gap to allow the magnetic core 310 a certain amount of movement within the magnetic core limiting groove 121, thereby facilitating the subsequent molding of the transformer assembly 300 and venting during potting, improving insulation performance.

[0068] The transformer disclosed in this application avoids the defects of the inner limiting component itself introduced between the outer winding 330 and the inner winding 320, as well as the air bubbles introduced by the structural dead angle between the inner winding 320 and the outer winding 330. This makes it difficult for air to be trapped in the insulation gap during the potting process, effectively improving the insulation performance of the transformer and reducing the partial discharge of the transformer.

[0069] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Specific technical means in some embodiments may be incorporated, in whole or in part, into another embodiment unless explicitly excluded by another embodiment. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A transformer, characterized in that, include: A transformer assembly (300) includes a magnetic core (310), an inner winding (320), and an outer winding (330). The inner winding (320) is wound on the magnetic core (310), and the outer winding (330) is sleeved on the outside of the inner winding (320). An insulating gap exists between the inner winding (320) and the outer winding (330). A potting housing (100) is provided with a receiving space (101) for accommodating the transformer assembly (300) and potting insulating material. The inner wall of the potting housing (100) is... A connecting portion (110) is provided on the upper part; a connecting component (200) is provided in the receiving space (101), the connecting component (200) is provided outside the insulation gap and is connected to the outer wall of the outer winding (330) and the connecting portion (110), the outer wall of the outer winding (330) includes the outer peripheral sidewall of the outer winding (330) facing away from the inner winding (320) and the axial end face sidewall; a flexible semi-conductive material is provided, the flexible semi-conductive material is covered on the connection part between the connecting component (200) and the outer winding (330).

2. The transformer as described in claim 1, characterized in that, The connection assembly (200) includes a plurality of first connectors connected between the connection portion (110) and the outer wall of the outer winding (330); the first connectors are wound and connected to the outer winding (330) and / or the connection portion (110) by the flexible semi-conductive material, and the flexible semi-conductive material covers the connection portion between the first connector and the outer winding (330).

3. The transformer as described in claim 1, characterized in that, The connection assembly (200) includes a plurality of second connectors (210), the first end of the second connector (210) is connected to the outer wall of the outer winding (330), and the flexible semiconductive material covers the connection portion between the second connector (210) and the outer winding (330). The second end of the second connector (210) is connected to the connection portion (110), and in the vertical direction, the first end of the second connector (210) is located below the second end of the second connector (210).

4. The transformer as described in claim 1, characterized in that, The connection assembly (200) includes a plurality of third connectors (220), the first end of the third connector (220) is connected to the outer wall of the outer winding (330), and the flexible semi-conductive material covers the connection between the third connector (220) and the outer winding (330). The second end of the third connector (220) is connected to the connection part (110), and in the vertical direction, the first end of the third connector (220) is located above the second end of the third connector (220).

5. The transformer as described in claim 1, characterized in that, The connecting part (110) has a hook-shaped structure and is provided with a hanging groove (111). The connecting component (200) is hooked and connected to the hanging groove (111).

6. The transformer as described in claim 5, characterized in that, The connecting assembly (200) includes a plurality of fourth connectors (250), which are connected to the mounting groove (111), and the two ends of the fourth connectors (250) are connected to the same or different positions of the outer wall of the outer winding (330). The flexible semi-conductive material covers the connection between the fourth connectors (250) and the outer winding (330); or, the connecting assembly (200) includes a plurality of fifth connectors (260), the first end of the fifth connectors (260) is provided with a mounting hole (261), which is connected to the mounting groove (111), the second end of the fifth connectors (260) is connected to the outer wall of the outer winding (330), and the flexible semi-conductive material covers the connection between the fifth connectors (260) and the outer winding (330).

7. The transformer as described in any one of claims 1-6, characterized in that, The flexible semiconductive material covers the entire outer wall of the connecting component (200).

8. The transformer as described in any one of claims 1-6, characterized in that, The outer winding (330) is one or more, and the connecting component (200) is one or more corresponding to the outer winding (330).

9. The transformer as described in any one of claims 1-6, characterized in that, The accommodating space (101) is provided with a core limiting groove (121) for embedding the core (310) and limiting the core (310); the core limiting groove (121) is constructed on the inner wall of the potting housing (100); or, the transformer further includes a limiting component (120), which itself is provided with the core limiting groove (121) or together with the inner wall of the potting housing (100) to form the core limiting groove (121).

10. The transformer as described in claim 9, characterized in that, The part of the magnetic core limiting groove (121) that contacts the magnetic core (310) is configured as a concave-convex structure. The convex part of the concave-convex structure is used to connect with the outer wall of the magnetic core (310), and the concave part of the concave-convex structure is used to form an exhaust gap with the magnetic core (310); or, the magnetic core limiting groove (121) and the magnetic core (310) have an assembly gap.

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