Power transformer insulation structure

Abstract

This utility model discloses an insulation structure for a power transformer, including a coil frame, primary pins, secondary pins, a primary coil, and a secondary coil. The coil frame includes a coil tube, a front stop, and a rear stop. A first insulating strip is provided on the outer surface of the coil tube. The primary coil is wound on the coil tube and on the first insulating strip, and the secondary coil is wound on the primary coil. A second insulating strip is provided on the outer surface of the secondary coil. The front and rear ends of the primary and secondary coils are respectively spaced from the front and rear stops. A third insulating strip is vertically provided at the outer end of the space, with one end connected to the first insulating strip and the other end connected to the second insulating strip. The primary pins and secondary pins are vertically fixed on the upper ends of the front and rear stops, respectively. The leads of the primary and secondary coils are fixedly connected to the primary pins and secondary pins, respectively. This utility model provides good insulation, is safe and reliable, can meet higher voltage resistance requirements, and can reduce production costs.

Description

Technical Field

[0001] This utility model relates to the field of electronic components technology, and in particular to an insulation structure for a power transformer. Background Technology

[0002] Transformers are extremely important electronic components in the electronics industry. They are devices that use the principle of electromagnetic induction to change alternating current voltage. Their main components are the primary coil, secondary coil, leads, coil frame, and iron core (magnetic core). In electrical equipment and wireless circuits, they are commonly used for voltage step-up / step-down, impedance matching, and safety isolation.

[0003] To meet environmental and voltage resistance requirements, power transformer insulation structures undergo high-voltage withstand testing during production to determine safety and insulation capabilities. Therefore, the adequacy of the power transformer's insulation structure is crucial. Currently, conventional power transformer insulation structures are insufficient to meet the higher insulation requirements of production testing. To obtain more reliable and safer power transformers, there is an urgent need for a higher voltage withstand and more economical insulation structure. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a power transformer insulation structure that not only ensures good insulation and safety and reliability when conducting high voltage resistance tests in production, but also meets higher pressure resistance requirements and reduces costs.

[0005] To solve the above-mentioned technical problems, this utility model adopts a power transformer insulation structure, including a coil frame, primary pins, secondary pins, a primary coil, and a secondary coil. The coil frame includes a coil tube, a front stop block, and a rear stop block. The front stop block and the rear stop block are respectively disposed at the front and rear ends of the coil tube. A first insulating strip is provided on the outer surface of the coil tube. The primary coil is wound on the coil tube and on the first insulating strip. The secondary coil is wound on the primary coil. A second insulating strip is provided on the outer surface of the secondary coil. The front and rear ends of the primary coil and the secondary coil are respectively separated from the front stop block and the rear stop block. A third insulating strip is vertically disposed at the outer end of the spacing. One end of the third insulating strip is connected to the first insulating strip, and the other end of the third insulating strip is connected to the second insulating strip. The primary pins and the secondary pins are respectively vertically fixedly disposed on the upper ends of the front stop block and the rear stop block. The leads of the primary coil and the leads of the secondary coil are respectively fixedly connected to the primary pins and the secondary pins.

[0006] In a preferred embodiment of the present invention, a fourth insulating strip is provided between the layers of the primary coil, and a fifth insulating strip is provided between the primary coil and the secondary coil. Two edge-insulating strips are respectively provided on the inner side of the front stop block, the inner side of the rear stop block, and on the fifth insulating strip.

[0007] In a preferred embodiment of this utility model, the fifth insulating tape is DuPont insulating paper, with two loops.

[0008] In a preferred embodiment of this utility model, the edge adhesive insulating tape is a 2mm wide non-woven fabric with three loops.

[0009] In a preferred embodiment of this utility model, the spacing is 1mm.

[0010] In a preferred embodiment of this utility model, the coil tube is a square tube, and the front block and the rear block are both rectangular. The upper ends of the front block and the rear block are respectively provided with two pin mounting plates, and the primary pin and the secondary pin are respectively mounted on the two pin mounting plates.

[0011] In a preferred embodiment of this utility model, the coil tube, the front stop block, the rear stop block, and the two pin mounting plates are integrally formed as a single piece.

[0012] By adopting the above structure, this utility model has the following beneficial effects:

[0013] The insulation structure of this utility model power transformer includes a coil frame, primary pins, secondary pins, a primary coil, and a secondary coil. The coil frame includes a coil tube, a front stop block, and a rear stop block. The front stop block and the rear stop block are respectively disposed at the front and rear ends of the coil tube. A first insulating strip is provided on the outer surface of the coil tube. The primary coil is wound on the coil tube and on the first insulating strip. The secondary coil is wound on the primary coil. A second insulating strip is provided on the outer surface of the secondary coil. The front and rear ends of the primary coil and the secondary coil are respectively separated from the front stop block and the rear stop block. A third insulating strip is vertically disposed at the outer end of the spacing. One end of the third insulating strip is connected to the first insulating strip, and the other end of the third insulating strip is connected to the second insulating strip. The primary pins and the secondary pins are respectively vertically fixedly disposed on the upper ends of the front stop block and the rear stop block. The leads of the primary coil and the leads of the secondary coil are respectively fixedly connected to the primary pins and the secondary pins. Thus, the structure of the first, second, and third insulating strips of this utility model effectively isolates the coil and the pins, resulting in good insulation of the transformer, improving the transformer's withstand voltage, and reducing material costs. The spacing of this utility model further improves the insulation performance of the transformer. The primary pins and secondary pins of this utility model are respectively located at the upper ends of the front and rear stops, ensuring good insulation and reliable safety of the transformer.

[0014] In this invention, a fourth insulating strip is provided between the layers of the primary coil, and a fifth insulating strip is provided between the primary coil and the secondary coil. Two edge-insulating strips are respectively provided on the inner side of the front stop block, the inner side of the rear stop block, and on the fifth insulating strip. The primary coil employs interlayer insulation, further improving the transformer's insulation; the insulating strip between the primary and secondary coils further improves the withstand voltage; and the two edge-insulating strips provide isolation, further preventing high-voltage arcing.

[0015] The fifth insulating tape of this invention is DuPont insulating paper, with two turns. This further improves the withstand voltage of the primary and secondary coils.

[0016] The edge-insulating tape of this invention is a 2mm wide non-woven fabric, arranged in three loops. In this way, the non-woven fabric serves as insulation, further preventing high-voltage arcing.

[0017] The spacing of this invention is 1mm. This saves costs and further improves the insulation of the product.

[0018] The coil tube of this invention is a square tube, and both the front and rear stops are rectangular. Two pin mounting plates are respectively provided on the upper end of the front and rear stops, and the primary and secondary pins are respectively mounted on the two pin mounting plates. This transformer structure better adapts to different application scenarios, provides better isolation between the coil and the pins, and makes the pins more stable.

[0019] The coil tube, front stop, rear stop, and two pin mounting plates of this invention are integrally formed as a single piece. This structure is relatively robust and reliable.

[0020] This utility model has a simple structure, is easy to implement, simple to install and operate, and has low manufacturing cost. Attached Figure Description

[0021] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings.

[0022] Figure 1 This is a three-dimensional schematic diagram of the insulation structure of a power transformer according to this utility model.

[0023] Figure 2 This is a cross-sectional schematic diagram of the structure of the primary and secondary coils, the first to fifth insulating strips, and the spacing of the present invention.

[0024] Figure 3 This is a three-dimensional schematic diagram of the structure of the coil frame of this utility model.

[0025] Figure 4 This is a three-dimensional schematic diagram showing the initial state of the first insulating tape, the second insulating tape, and the third insulating tape on the coil frame during the production of this utility model. Detailed Implementation

[0026] See Figure 1 , Figure 2 , Figure 3 and Figure 4The power transformer insulation structure shown includes a coil frame 1, primary pins 2, secondary pins 3, a primary coil 4, and a secondary coil 5. The coil frame 1 includes a coil tube 1-1, a front stop 1-2, and a rear stop 1-3. The front stop 1-2 and the rear stop 1-3 are respectively disposed at the front and rear ends of the coil tube 1-1. A first insulating strip 6 is provided on the outer surface of the coil tube 1-1. The primary coil 4 is wound on the coil tube 1-1 and on the first insulating strip 6. The secondary coil 5 is wound on the primary coil 4. A second insulating strip 6 is provided on the outer surface of the secondary coil 5. The primary coil 4 and the secondary coil 5 are connected to the front and rear ends of the front and rear blocks 1-2 and 1-3 respectively by a gap 8. A third insulating strip 9 is vertically provided at the outer end of the gap 8. One end of the third insulating strip 9 is connected to the first insulating strip 6, and the other end of the third insulating strip 9 is connected to the second insulating strip 7. The primary pin 2 and the secondary pin 3 are vertically fixed at the upper ends of the front and rear blocks 1-2 and 1-3 respectively. The lead wires of the primary coil 4 and the secondary coil 5 are fixedly connected to the primary pin 2 and the secondary pin 3 respectively. The lead wires are not shown in the figure.

[0027] As a preferred embodiment of this utility model, such as Figure 1 and Figure 2 As shown, a fourth insulating strip 10 is provided between the layers of the primary coil 4, and a fifth insulating strip 11 is provided between the primary coil 4 and the secondary coil 5. Two edge-adhesive insulating strips 12 are respectively provided on the inner side of the front block 1-2, the inner side of the rear block 1-3, and on the fifth insulating strip 11.

[0028] As a preferred embodiment of this utility model, such as Figure 2 As shown, the fifth insulating tape 11 is DuPont insulating paper, with two loops.

[0029] As a preferred embodiment of this utility model, such as Figure 1 As shown, the edge adhesive insulating tape 12 is a 2mm wide non-woven fabric with three loops.

[0030] As a preferred embodiment of this utility model, such as Figure 1 and Figure 2 As shown, the spacing 8 is 1mm.

[0031] As a preferred embodiment of this utility model, such as Figure 1 , Figure 3 and Figure 4 As shown, the coil tube 1-1 is a square tube, and the front stop 1-2 and the rear stop 1-3 are both rectangular. The upper ends of the front stop 1-2 and the rear stop 1-3 are respectively provided with two pin mounting plates 1-4, and the primary pin 2 and the secondary pin 3 are respectively mounted on the two pin mounting plates 1-4.

[0032] As a preferred embodiment of this utility model, such as Figure 1 , Figure 3 and Figure 4 As shown, the coil tube 1-1, the front stop 1-2, the rear stop 1-3 and the two pin mounting plates 1-4 are integrally formed as a single piece.

[0033] In the production of this invention, firstly, the front part of a long insulating strip is placed on the outer surface of the coil tube 1-1 to form a first insulating strip 6. Then, the middle and rear part of the long insulating strip is bent upwards and vertically at the rear stop block 1-3, forming a third insulating strip 9 in the middle. Next, the primary coil 4 is wound centered on the coil tube 1-1 of the coil frame 1 and on the first insulating strip 6. The front and rear ends of the primary coil 4 are separated from the front stop block 1-2 and the rear stop block 1-3 by a space of 1mm (spacing 8). A fourth insulating strip 10 is wound between each layer of the primary coil 4 for isolation. After the primary coil 4 is wound, Next, wrap two turns of DuPont insulating paper (fifth insulating tape 11) around the primary coil 4. Then, wrap three turns of 2mm wide non-woven fabric around the fifth insulating tape 11 near the inside of the front stop 1-2 and the rear stop 1-3 respectively (edge ​​adhesive insulating tape 12). Then, wind the secondary coil 5 on the edge adhesive insulating tape 12 and the fifth insulating tape 11. Leave a 1mm gap (spacing 8) between the front and rear ends of the secondary coil 5 and the front stop 1-2 and the rear stop 1-3 respectively. After the secondary coil 5 is wound, fold the rear part of the long insulating tape back to the outer surface of the secondary coil 5 to form the second insulating tape 7.

[0034] After testing, this utility model enhanced the insulation between the coil and the pin in actual production, improved the product's withstand voltage, and increased the withstand voltage of the power transformer from 3750V to 3900V, an increase of 4%. The product production also reduced one isolation process, saved non-woven fabric, and reduced raw material costs by 2%, achieving good economic benefits.

Claims

1. An insulation structure for a power transformer, comprising a coil frame (1), primary pins (2), secondary pins (3), a primary coil (4), and a secondary coil (5), wherein the coil frame (1) comprises a coil tube (1-1), a front stop (1-2), and a rear stop (1-3), wherein the front stop (1-2) and the rear stop (1-3) are respectively disposed at the front and rear ends of the coil tube (1-1), characterized in that: The outer surface of the coil tube (1-1) is provided with a first insulating strip (6). The primary coil (4) is wound on the coil tube (1-1) and on the first insulating strip (6). The secondary coil (5) is wound on the primary coil (4). The outer surface of the secondary coil (5) is provided with a second insulating strip (7). The front and rear ends of the primary coil (4) and the secondary coil (5) are respectively separated by a gap (8) from the front stop (1-2) and the rear stop (1-3). The outer end is vertically provided with a third insulating strip (9), one end of the third insulating strip (9) is connected to the first insulating strip (6), and the other end of the third insulating strip (9) is connected to the second insulating strip (7). The primary pin (2) and the secondary pin (3) are respectively vertically fixed at the upper ends of the front block (1-2) and the rear block (1-3). The lead wire of the primary coil (4) and the lead wire of the secondary coil (5) are respectively fixedly connected to the primary pin (2) and the secondary pin (3).

2. The power transformer insulation structure of claim 1, wherein: A fourth insulating strip (10) is provided between the layers of the primary coil (4), and a fifth insulating strip (11) is provided between the primary coil (4) and the secondary coil (5). Two edge-insulating strips (12) are respectively provided on the inner side of the front block (1-2), the inner side of the rear block (1-3), and on the fifth insulating strip (11).

3. The power transformer insulation structure of claim 2, wherein: The fifth insulating tape (11) is DuPont insulating paper, with two loops.

4. The power transformer insulation structure of claim 2, wherein: The edge-insulating tape (12) is a 2mm wide non-woven fabric with three loops.

5. The power transformer insulation structure of claim 1, wherein: The spacing (8) is 1 mm.

6. The power transformer insulation structure of claim 1, wherein: The coil tube (1-1) is a square tube, and the front stop (1-2) and the rear stop (1-3) are both rectangular. The upper ends of the front stop (1-2) and the rear stop (1-3) are respectively provided with two pin mounting plates (1-4), and the primary pin (2) and the secondary pin (3) are respectively mounted on the two pin mounting plates (1-4).

7. The power transformer insulation structure of claim 6, wherein: The coil tube (1-1), the front stop (1-2), the rear stop (1-3), and the two pin mounting plates (1-4) are integrally formed as a single piece.

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