Phase-shifting transformer with separately cast secondary winding

Abstract

The utility model discloses a phase shifting transformer of secondary coil individual casting belongs to transformer technical field, including the core, primary coil and secondary coil subassembly, the core, primary coil and secondary coil subassembly are by inside to outside in proper order setting, the secondary coil subassembly includes a plurality of secondary windings, the secondary winding is from top to bottom in proper order setting, and the limiting silica gel board is established between two secondary windings of adjacent, to form the air gap between two secondary windings of adjacent, the secondary winding is along its circumferential direction and is set up with axial air passage, and the axial air passage is from top to bottom and penetrates the secondary winding. The phase shifting transformer of secondary coil individual casting has solved the problem that the current phase shifting transformer is difficult to set up the air passage in the secondary winding.

Description

Technical Field

[0001] This utility model relates to the field of transformer technology, and in particular to a phase-shifting transformer with a separately cast secondary coil. Background Technology

[0002] A transformer is a device that uses the principle of electromagnetic induction to change alternating current voltage. Its main components are the primary coil, secondary coil, and iron core (magnetic core). Existing epoxy-cast phase-shifting transformers typically have multiple windings with different phases in their secondary coils to facilitate the generation of secondary voltages with different phases; however, as... Figure 1 As shown, the current structure of the secondary coil of epoxy-cast phase-shifting transformer is to cast all secondary windings with different phases into a whole using epoxy resin. However, this makes it difficult to set up air channels in the secondary windings, which is not conducive to heat dissipation. Utility Model Content

[0003] In order to overcome the defects of the existing technology, this utility model provides a phase-shifting transformer with a separately cast secondary coil to solve the above-mentioned problems.

[0004] The technical solution adopted by this utility model to solve its technical problem is: a phase-shifting transformer with a separately cast secondary coil, comprising an iron core, a primary coil, and a secondary coil assembly; the iron core, the primary coil, and the secondary coil assembly are arranged sequentially from the inside to the outside; The secondary coil assembly includes multiple secondary windings arranged sequentially from top to bottom. A limiting silicone plate is provided between two adjacent secondary windings to form an air guide gap between them. The secondary winding has an axial air passage along its circumference, which runs from top to bottom through the secondary winding.

[0005] Preferably, the upper and lower surfaces of the secondary winding are provided with positioning holes; the upper and lower surfaces of the limiting silicone plate are provided with protrusions, and the protrusions on the upper and lower surfaces of the limiting silicone plate are respectively connected to the positioning holes of two adjacent secondary windings.

[0006] Optionally, the secondary winding has multiple axial air passages along its circumference, and the positioning hole is formed between two adjacent axial air passages.

[0007] Specifically, an insulating cylinder is provided between the primary coil and the secondary coil assembly.

[0008] It is worth noting that a limiting silicone post is provided between the insulating cylinder and the secondary winding.

[0009] Specifically, the upper and lower ends of the limiting silicone post are provided with grooves to form a binding gap between the limiting silicone post and the secondary winding.

[0010] The beneficial effects of this utility model are as follows: In the phase-shifting transformer with separately cast secondary coils, by splitting the secondary coil assembly into multiple secondary windings of different phases and separately cast with epoxy resin, the secondary windings of the secondary coil assembly form a layered structure. Compared with the secondary winding cast into a whole with epoxy resin, the height of a single secondary winding in the layered structure is smaller, which facilitates the formation of a through axial air passage in the vertical direction of the secondary winding, increases the heat dissipation area, and, together with the air guide gap formed between two adjacent secondary windings, reduces the temperature rise of the secondary winding. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of a conventional phase-shifting transformer in one embodiment of the present invention; Figure 2 This is a schematic diagram of the phase-shifting transformer in one embodiment of the present invention; Figure 3 This is a top sectional view of a phase transformer in one embodiment of the present invention; Figure 4 for Figure 3 A cross-sectional view along the AA direction; Figure 5 This is a schematic diagram of the structure of the limiting silicone plate in one embodiment of the present invention; In the diagram: 1 Iron core; 2 Primary coil; 3 Secondary coil assembly; 31 Secondary winding; 311 Axial air passage; 312 Positioning hole; 32 Limiting silicone plate; 321 Protrusion; 33 Air guide gap; 34 Limiting silicone pillar; 341 Groove; 35 Binding gap; 4 Insulating cylinder. Detailed Implementation

[0012] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings. It should be noted that these descriptions are for the purpose of aiding understanding of this utility model, but do not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0013] like Figure 1-5 As shown, a phase-shifting transformer with a separately cast secondary coil includes an iron core 1, a primary coil 2, and a secondary coil assembly 3; the iron core 1, the primary coil 2, and the secondary coil assembly 3 are arranged sequentially from the inside out. The secondary coil assembly 3 includes multiple secondary windings 31, each secondary winding 31 is individually cast with epoxy resin, the secondary windings 31 are arranged sequentially from top to bottom, and a limiting silicone plate 32 is provided between two adjacent secondary windings 31 to form an air guide gap 33 between two adjacent secondary windings 31. The secondary winding 31 has an axial air passage 311 along its circumference, and the axial air passage 311 passes through the secondary winding 31 from top to bottom.

[0014] In the phase-shifting transformer with separately cast secondary coils, the secondary coil assembly 3 is divided into multiple secondary windings 31 with different phases and separately cast with epoxy resin, so that the secondary windings 31 of the secondary coil assembly 3 form a layered structure. Compared with the secondary windings 31 cast into a whole with epoxy resin, the height of a single secondary winding 31 in the layered structure is smaller, which makes it easier to form a through axial air passage 311 in the vertical direction of the secondary windings 31, increasing the heat dissipation area. Combined with the air guide gap 33 formed between two adjacent secondary windings 31, the temperature rise of the secondary windings 31 can be reduced.

[0015] Preferred, such as Figure 2 , 3 As shown in Figure 5, positioning holes 312 are provided on both the upper and lower surfaces of the secondary winding 31, wherein the positioning holes 312 of two adjacent secondary windings 31 are arranged opposite to each other; the upper and lower surfaces of the limiting silicone plate 32 are provided with protrusions 321, and the protrusions 321 on the upper and lower surfaces of the limiting silicone plate 32 are respectively connected to the positioning holes 312 of two adjacent secondary windings 31.

[0016] In this embodiment, four positioning holes 312 are provided on the upper and lower surfaces of the secondary windings 31 with different phases. These holes engage with the protrusions 321 of the limiting silicone plate 32 to position the limiting silicone plate 32, thereby assembling and positioning the two windings with different phases. The limiting silicone plate 32 is used for axial positioning of adjacent secondary windings 31, ensuring the perpendicularity of the assembly of adjacent secondary windings 31 with different phases and preventing the overall skewing of the secondary coil assembly 3. The silicone has a certain degree of flexibility, which prevents abnormal vibration of the secondary coil assembly 3 due to unevenness of the upper and lower end surfaces of adjacent secondary windings 31 with different phases. In addition, the thickness of the limiting silicone plate 32 increases the air guide gap 33 between the windings with different phases, which not only facilitates the overall heat dissipation of the coil but also increases the creepage distance between the terminals of the secondary windings 31 with different phases, improving the electrical performance of the product.

[0017] Optional, such as Figure 3 As shown, the secondary winding 31 has multiple axial air passages 311 along its circumference, and the positioning hole 312 is opened between two adjacent axial air passages 311.

[0018] In this embodiment, the length of each axial air passage 311 is consistent. Therefore, by setting the positioning holes 312 in this way, the positioning holes 312 can be evenly distributed on the upper and lower surfaces of the secondary winding 31. After the limiting silicone plate 32 is installed, the limiting silicone plate 32 can be evenly distributed on the upper and lower surfaces of the secondary winding 31, thereby keeping the secondary winding 31 balanced.

[0019] Specifically, such as Figure 2 , 3 As shown in Figures 4 and 5, an insulating cylinder 4 is provided between the primary coil 2 and the secondary coil assembly 3.

[0020] The insulating cylinder 4 is placed between the primary coil 2 and the secondary coil assembly 3 to strengthen the insulation, reduce the air distance between the primary coil 2 and the secondary coil assembly 3, and increase the electrical clearance and creepage distance between the primary coil 2 and the secondary coil assembly 3.

[0021] It is worth noting that a limiting silicone post 34 is provided between the insulating cylinder 4 and the secondary winding 31.

[0022] With this design, the insulating cylinder 4, together with the limiting silicone pillar 34, can form a supporting frame, which can provide support on the inner side of each secondary winding 31. The limiting silicone pillar 34 is placed between the insulating cylinder 4 and the secondary winding 31 to limit the movement, so that the secondary windings 31 with different phases are combined with the insulating cylinder 4 into a whole, avoiding inconsistencies in the position of the secondary windings with different phases during assembly.

[0023] Preferred, such as Figure 4 As shown, the upper and lower ends of the limiting silicone post 34 are provided with grooves 341 to form a binding gap 35 between the limiting silicone post 34 and the secondary winding 31.

[0024] The silicone has a certain degree of hardness to limit the movement without damaging the inner wall of the secondary winding 31 with different phases. Through the binding gap 35 formed by the groove 341, and with the help of the binding strap, the limiting silicone post 34 can be fixed to the insulating cylinder 4.

[0025] The embodiments of this utility model have been described in detail above with reference to the accompanying drawings, but this utility model is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of this utility model, and these variations still fall within the protection scope of this utility model.

Claims

1. A phase-shifting transformer with a separately cast secondary coil, characterized in that: It includes an iron core, a primary coil, and a secondary coil assembly; the iron core, primary coil, and secondary coil assembly are arranged sequentially from the inside out; The secondary coil assembly includes multiple secondary windings arranged sequentially from top to bottom. A limiting silicone plate is provided between two adjacent secondary windings to form an air guide gap between them. The secondary winding has an axial air passage along its circumference, which runs from top to bottom through the secondary winding.

2. A phase-shifting transformer with a separately cast secondary coil according to claim 1, characterized in that: The upper and lower surfaces of the secondary winding are provided with positioning holes; the upper and lower surfaces of the limiting silicone plate are provided with protrusions, and the protrusions on the upper and lower surfaces of the limiting silicone plate are respectively connected to the positioning holes of two adjacent secondary windings.

3. A phase-shifting transformer with a separately cast secondary coil according to claim 2, characterized in that: The secondary winding has multiple axial air passages along its circumference, and the positioning hole is located between two adjacent axial air passages.

4. A phase-shifting transformer with a separately cast secondary coil according to claim 1, characterized in that: An insulating cylinder is provided between the primary coil and the secondary coil assembly.

5. A phase-shifting transformer with a separately cast secondary coil according to claim 4, characterized in that: A limiting silicone post is provided between the insulating cylinder and the secondary winding.

6. A phase-shifting transformer with a separately cast secondary coil according to claim 5, characterized in that: The upper and lower ends of the limiting silicone post are provided with grooves to form a binding gap between the limiting silicone post and the secondary winding.

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