Embedded winding transformer

Abstract

The utility model provides a nesting type winding transformer which comprises a framework, a magnetic core, an inner coil, an outer coil, an insulating layer and a protective cover, the inner coil is wound in an inner ring cavity, the wire inlet and outlet end of the inner coil penetrates out of the first side of a lower baffle, the outer coil is wound in an outer ring cavity, the wire inlet and outlet end of the outer coil penetrates out of the second side of the lower baffle, and the insulating layer is arranged on the lower side of the lower baffle. The insulating layer is sleeved on the periphery of the outer coil, the protective cover comprises a cover plate and a cover ring wall connected with the periphery of the cover plate, the cover plate and the upper magnetic plate are adaptively covered on the upper end face of the insulating rubber tape on the upper magnetic plate, and the cover ring wall is sleeved on the periphery of the upper end of the upper magnetic plate and the outer side of the upper end of the insulating rubber tape. According to the nested winding transformer, the height and the overall size of a device can be reduced, the production process is simplified, the production efficiency is improved, the production cost is reduced, the top magnetic core can be prevented from being damaged, the pin open circuit abnormity can be completely eradicated, and therefore the use safety is improved, and the service life is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of electromagnetic components technology, and in particular to an embedded winding transformer. Background Technology

[0002] Transformers, as important electromagnetic components, are widely used in power supply and electronics technologies. They utilize the principle of induction through the conversion of electrical and magnetic energy to adjust different voltages to achieve the applicable range for electrical equipment. The main components of a transformer are the frame, primary coil, secondary coil, and magnetic core. Its main functions include voltage transformation, current transformation, impedance transformation, and isolation.

[0003] Existing transformers have pin seats at the bottom of the frame to support the entire transformer. However, high-power transformers are relatively heavy, and the entire weight of the transformer rests on the pin seats. Over time, this can cause cracking and loosening at the connection between the pin seats and the frame body. This can lead to loosening, deformation, and improper connection of the pins on the pin seats, resulting in open circuits or short circuits, posing a safety hazard. Furthermore, the current method of supporting the transformer with pin seats at the bottom of the frame increases the overall height and size of the transformer, thus requiring more installation space.

[0004] Furthermore, in the process of winding coils on the frame of existing transformers, each end of the coil needs to be wound around each pin on the pin seat, which makes the production process more complicated and increases production costs.

[0005] In addition, in order to insulate the magnetic core, existing transformers simply wrap insulating tape around the outer periphery of the magnetic core. However, in actual use, the insulating tape around the magnetic core is easily punctured. In particular, the magnetic core located at the top of the transformer is easily damaged by collisions or friction from other components, which poses a safety hazard. Summary of the Invention

[0006] To achieve the main objective of this utility model, it provides an embedded winding transformer that can reduce device height and overall volume, simplify production process, improve production efficiency and reduce production cost. It can not only avoid damage to the top magnetic core, but also eliminate pin open circuit abnormalities, thereby improving safety, extending service life, and achieving automated and efficient winding with good product consistency.

[0007] To achieve the main objective of this utility model, it provides an embedded wound transformer, comprising a frame, a magnetic core, an inner coil, an outer coil, an insulation layer, and a protective cover. The frame includes an upper baffle, an inner cylindrical ring, an outer cylindrical ring, and a lower baffle. The upper and lower baffles are respectively disposed at the upper and lower ends of the inner and outer cylindrical rings. The outer cylindrical ring is fitted around the outer circumference of the inner cylindrical ring and forms an inner annular cavity with the inner cylindrical ring. The outer cylindrical ring forms an outer annular cavity with an open outer circumference between it and the upper and lower baffles. The magnetic core includes a magnetic column, an upper magnetic plate, a lower magnetic plate, and two magnetic arms. The upper magnetic plate is located at the upper end of the upper baffle, and the lower magnetic plate is located at the lower end of the lower baffle. The magnetic column is located inside the cylindrical hole of the inner cylindrical ring and is disposed between the upper and lower magnetic plates. The two magnetic arms are respectively located at... The outer ring cavity is located on the opposite side and between the upper and lower magnetic plates. The outer surfaces of the upper and lower magnetic plates and the two magnetic arms are wrapped with insulating tape. The inner coil is wound inside the inner ring cavity, and the inlet and outlet ends of the inner coil pass through the first side of the lower baffle. The outer coil is wound inside the outer ring cavity, and the inlet and outlet ends of the outer coil pass through the second side of the lower baffle. The second side of the lower baffle and the first side of the lower baffle are positioned opposite each other with respect to the magnetic core. The insulating layer is sleeved on the outer periphery of the outer coil. The protective cover includes a cover plate and a cover ring wall connected to the periphery of the cover plate. The cover plate fits onto the upper surface of the insulating tape on the upper magnetic plate. The cover ring wall is sleeved on the upper outer periphery of the upper magnetic plate and the upper outer side of the insulating tape.

[0008] As can be seen from the above scheme, in this utility model, the outer cylindrical ring of the skeleton of the nested wound transformer is sleeved on the outer circumference of the inner cylindrical ring and forms an inner annular cavity with the inner cylindrical ring. The outer cylindrical ring forms an outer annular cavity with an open outer circumference between it and the upper and lower baffles. The inner coil is wound inside the inner annular cavity, and the outer coil is wound inside the outer annular cavity, so that the outer coil is nested around the outer circumference of the inner coil, thus constituting a nested wound transformer. This reduces the height of the device and the overall volume. Furthermore, in this utility model, the input and output ends of the inner coil are arranged to protrude through the first side of the lower baffle, and the input and output ends of the outer coil are arranged to protrude through the second side of the lower baffle. Therefore, when installing this utility model nested wound transformer, the lower... The entire surface of the magnetic plate is in contact with the circuit board, ensuring an even distribution of gravity. This avoids the problems of uneven gravity distribution that can lead to cracking or loosening at the connection between the pin holder and the main body of the existing transformer, which uses a frame for support. This improves the safety of the product. At the same time, the input and output ends of the inner coil pass through the first side of the lower baffle and directly connect to the terminals of the circuit board. The input and output ends of the outer coil, and the second side of the lower baffle, also directly connect to the terminals of the circuit board. Therefore, the frame of this invention does not need to be equipped with pin holders, which can further reduce the height and overall volume of the device. It can also prevent pin open circuit abnormalities, thereby improving the safety of use and extending the service life.

[0009] Furthermore, the outer surfaces of the upper magnetic plate, lower magnetic plate, and two magnetic arms of this utility model's nested wound transformer are wrapped with insulating tape, which improves the insulation and anti-interference performance as well as the stability of the assembly. The cover plate of the protective cover fits onto the upper magnetic plate and covers the upper end surface of the insulating tape on the upper magnetic plate. The cover ring wall of the protective cover is sleeved on the upper outer periphery of the upper magnetic plate and the upper outer side of the insulating tape. Thus, the protective cover of this utility model's nested wound transformer can protect the insulating tape on the upper magnetic plate from being punctured and protect the upper magnetic plate from collisions or friction from other components, thereby avoiding damage to the top magnetic core, improving safety and extending service life.

[0010] In addition, the inner and outer coils of the nested wound transformer of this utility model are independently set in the inner and outer ring cavities, respectively, and the inner and outer coils are isolated by the inner ring. The inner and outer coils are two independent entities, thereby eliminating the problem of insufficient safety distance between the inner and outer coils.

[0011] Furthermore, the frame of this utility model's nested wound transformer does not require the installation of pin seats and pins, thus eliminating the need to wind each end of the coil onto each pin, thereby simplifying the production process, achieving automated and efficient winding, resulting in good product consistency, improved production efficiency, and reduced production costs.

[0012] Therefore, the embedded winding transformer of this invention can reduce the height and overall volume of the device, simplify the production process, improve production efficiency, and reduce production costs. It can not only avoid damage to the top magnetic core, but also eliminate pin open circuit abnormalities, thereby improving safety, extending service life, and achieving automated and efficient winding with good product consistency.

[0013] A further embodiment is that the nested wound transformer also includes a buffer pad, the first part of which presses against the upper end face of the insulating tape on the cover plate and the upper magnetic plate, and the second part of which presses against the upper end face of the cover plate and the upper magnetic plate.

[0014] A further embodiment is that the cushioning pad is bonded to the cover plate by a first adhesive layer; and / or, the cushioning pad is bonded to the upper end face of the insulating tape on the upper magnetic plate and the upper end face of the upper magnetic plate by a second adhesive layer; and / or, the cushioning pad is made of elastic silicone.

[0015] A further embodiment is that the first side of the lower baffle has a first wire-passing groove and two first heat dissipation grooves extending through the magnetic column in the axial direction, the inlet and outlet ends of the inner coil passing through the first wire-passing groove, and the two first heat dissipation grooves being symmetrically arranged about the first wire-passing groove; and / or, the second side of the lower baffle has two second wire-passing grooves and one second heat dissipation groove extending through the magnetic column in the axial direction, the two second wire-passing grooves being symmetrically arranged about the second heat dissipation groove, the inlet end of the outer coil passing through one second wire-passing groove, and the outlet end of the outer coil passing through the other second wire-passing groove.

[0016] A further option is that the inner coil has a larger wire diameter than the outer coil; and / or, the inner coil has one winding layer and the outer coil has two winding layers.

[0017] A further embodiment is that the frame includes a first support and a second support. The first support includes an upper baffle, an outer cylindrical ring, and a first inner baffle. The upper baffle and the first inner baffle are respectively connected to the upper and lower ends of the outer cylindrical ring. The second support includes a lower baffle, an inner cylindrical ring, and a second inner baffle. The second inner baffle and the lower baffle are respectively connected to the upper and lower ends of the inner cylindrical ring. The second inner baffle abuts against the inner end face of the upper baffle and forms an inner annular cavity between the lower baffle, the inner cylindrical ring, and the outer cylindrical ring. The first inner baffle abuts against the inner end face of the lower baffle and forms an outer annular cavity between the outer cylindrical ring and the upper baffle. The upper baffle has a slot that extends through the magnetic column in the axial direction. The second inner baffle is provided with a buckle. The protruding part of the buckle protrudes from the slot and hooks onto the upper end face of the upper baffle.

[0018] A further embodiment is that the magnetic column includes a first support column and a second support column, and a magnetic arm includes a first arm and a second arm. The first support column and two first arms are disposed on the inner end face of the upper magnetic plate, and the second support column and two second arms are disposed on the inner end face of the lower magnetic plate. The first support column and the second support column abut against each other in the axial direction of the inner cylinder ring, and one first arm abuts against one second arm in the axial direction of the inner cylinder ring.

[0019] A further solution is to fix a first arm and a second arm together at the axial abutment position of the inner cylinder ring using epoxy resin adhesive.

[0020] A further embodiment is that the upper end face of the upper baffle is provided with two first limiting plates, and the two first limiting plates and the upper baffle form a first limiting groove, with the inner end of the upper magnetic plate located in the first limiting groove; and / or, the lower end face of the lower baffle is provided with two second limiting plates, and the two second limiting plates and the lower baffle form a second limiting groove, with the inner end of the lower magnetic plate located in the second limiting groove.

[0021] A further option is that two first limiting plates are arranged opposite to the upper magnetic plate and form an installation gap between them and the periphery of the upper magnetic plate, with the cover ring wall embedded in the installation gap; and / or, two second limiting plates are arranged opposite to the lower magnetic plate and form a heat dissipation gap between them and the periphery of the lower magnetic plate. Attached Figure Description

[0022] Figure 1 This is a first-view structural diagram of an embodiment of an embedded wound transformer according to this utility model.

[0023] Figure 2 This is a second-view structural diagram of an embodiment of an embedded wound transformer according to this utility model.

[0024] Figure 3 This is a first-view sectional view of an embodiment of an embedded wound transformer according to this utility model.

[0025] Figure 4 This is a second-view sectional view of an embodiment of an embedded wound transformer of this utility model.

[0026] Figure 5 This is an exploded view of an embodiment of an embedded wound transformer according to this utility model.

[0027] Figure 6 This is a structural diagram of the first bracket in an embodiment of an embedded wound transformer of this utility model.

[0028] Figure 7 This is a structural diagram of the second bracket in an embodiment of an embedded wound transformer of this utility model.

[0029] Figure 8 This is a first-view structural cross-sectional view of the first support, second support, inner coil and outer coil in an embodiment of an embedded wound transformer of this utility model.

[0030] Figure 9 This is a second-view structural cross-sectional view of the first support, second support, inner coil, and outer coil in an embodiment of an embedded wound transformer of this utility model.

[0031] Figure 10 This is a first partial structural diagram of an embodiment of an embedded wound transformer of this utility model.

[0032] Figure 11 This is a second partial structural diagram of an embodiment of an embedded wound transformer of this utility model.

[0033] The present invention will be further described below with reference to the accompanying drawings and embodiments. Detailed Implementation

[0034] See Figures 1 to 11This embodiment discloses an embedded wound transformer 10, including a frame 16 and a magnetic core 13. The frame 16 includes an upper baffle 1612, an inner cylindrical ring 1621, an outer cylindrical ring 1611, and a lower baffle 1622. The upper baffle 1612 and the lower baffle 1622 are respectively disposed at the upper and lower ends of the inner cylindrical ring 1621 and the outer cylindrical ring 1611. The outer cylindrical ring 1611 is sleeved on the outer periphery of the inner cylindrical ring 1621 and forms an inner annular cavity 163 with the inner cylindrical ring 1621. An outer annular cavity 164 with an open outer periphery is formed between the outer cylindrical ring 1611 and the upper baffle 1612 and the lower baffle 1622. The magnetic core 13 includes magnetic pillars 1312 and 1322 and an upper magnetic plate. 1311, lower magnetic plate 1321 and two magnetic arms 1313, 1323, upper magnetic plate 1311 is located at the upper end of upper baffle 1612, lower magnetic plate 1321 is located at the lower end of lower baffle 1622, magnetic pillars 1312, 1322 are located in the cylinder hole 1624 of inner cylinder ring 1621 and are arranged between upper magnetic plate 1311 and lower magnetic plate 1321, and two magnetic arms 1313, 1323 are respectively located on the opposite outer side of outer ring cavity 164 and are arranged between upper magnetic plate 1311 and lower magnetic plate 1321, and the outer surfaces of upper magnetic plate 1311, lower magnetic plate 1321 and two magnetic arms 1313, 1323 are wrapped with insulating tape 12. Furthermore, the nested wound transformer 10 in this embodiment also includes an inner coil 171, an outer coil 172, an insulation layer 15, and a protective cover 11. The inner coil 171 is wound inside the inner annular cavity 163, and the input / output ends 1711 of the inner coil 171 extend through the first side of the lower baffle 1622. The outer coil 172 is wound inside the outer annular cavity 164, and the input / output ends 1721 and 1722 of the outer coil 172 extend through the second side of the lower baffle 1622. The lower baffle 162... The second side of 2 is disposed opposite to the first side of the lower baffle 1622 with respect to the magnetic core 13. The insulating layer 15 is sleeved on the outer periphery of the outer coil 172. The protective cover 11 includes a cover plate 111 and a cover ring wall 112 connected to the periphery of the cover plate 111. The cover plate 111 fits onto the upper end surface of the insulating tape 12 on the upper magnetic plate 1311. The cover ring wall 112 is sleeved on the upper outer periphery of the upper magnetic plate 1311 and the upper outer side of the insulating tape 12.

[0035] In this embodiment, the outer ring 1611 of the skeleton 16 of the embedded wound transformer 10 is sleeved on the outer periphery of the inner ring 1621, forming an inner ring cavity 163 between them. The outer ring 1611, the upper baffle 1612, and the lower baffle 1622 form an outer ring cavity 164 with an open outer periphery. The inner coil 171 is wound within the inner ring cavity 163, and the outer coil 172 is wound within the outer ring cavity 164, so that the outer coil 172 is embedded around the outer periphery of the inner coil 171, thus constituting an embedded wound transformer 10. This reduces the device height and overall volume. Furthermore, in this embodiment, the input / output ends 1711 of the inner coil 171 protrude through the first side of the lower baffle 1622, and the input / output ends 1721 and 1722 of the outer coil 172 protrude through the second side of the lower baffle 1622, thereby... When installing the nested wound transformer 10 of this embodiment, the entire lower magnetic plate 1321 contacts the circuit board, so that the gravity is evenly distributed. This avoids the problem of uneven gravity distribution caused by the use of the frame pin seat for support in existing transformers, which can lead to cracking and loosening at the connection between the pin seat and the frame body. This improves the safety of product use. At the same time, the input and output ends 1711 of the inner coil 171 pass through the first side of the lower baffle 1622 and directly connect to the terminals of the circuit board. The input and output ends 1721 and 1722 of the outer coil 172 pass through the second side of the lower baffle 1622 and directly connect to the terminals of the circuit board. Therefore, the frame 16 of this embodiment does not need to be equipped with pin seats, which can further reduce the height of the device and the overall volume. It can also prevent pin open circuit abnormalities, thereby improving the safety of use and extending the service life.

[0036] Furthermore, in this embodiment, the outer surfaces of the upper magnetic plate 1311, the lower magnetic plate 1321, and the two magnetic arms 1313 and 1323 of the nested wound transformer 10 are wrapped with insulating tape 12, which improves the insulation and anti-interference performance and the stability of the assembly. The cover plate 111 of the protective cover 11 fits onto the upper surface of the insulating tape 12 on the upper magnetic plate 1311. The cover ring wall 112 of the protective cover 11 is sleeved on the upper outer periphery of the upper magnetic plate 1311 and the upper outer side of the insulating tape 12. Thus, the protective cover 11 of the nested wound transformer 10 in this embodiment can protect the insulating tape 12 on the upper magnetic plate 1311 from being punctured, and protect the upper magnetic plate 1311 from being hit or rubbed by other components, thereby avoiding damage to the top magnetic core 13, thereby improving the safety of use and extending the service life.

[0037] In addition, in this embodiment, the inner coil 171 and the outer coil 172 of the nested wound transformer 10 are independently arranged in the inner ring cavity 163 and the outer ring cavity 164, respectively, and the inner coil 171 and the outer coil 172 are isolated by the inner ring 1621. The inner coil 171 and the outer coil 172 are two independent individuals, thereby eliminating the problem of insufficient safety distance between the inner coil 171 and the outer coil 172.

[0038] Furthermore, in this embodiment, the frame 16 of the nested winding transformer 10 does not need to be equipped with pin seats and pins, so there is no need to wind each wire end of the coil onto each pin, thereby simplifying the production process, realizing automated and efficient winding, resulting in good product consistency, improving production efficiency, and reducing production costs.

[0039] Therefore, the nested wound transformer 10 of this embodiment can reduce the height and overall volume of the device, simplify the production process, improve production efficiency, and reduce production costs. It can not only avoid damage to the top magnetic core 13, but also prevent pin open circuit abnormalities, thereby improving safety, extending service life, and achieving automated and efficient winding with good product consistency.

[0040] To further prevent damage to the transformer and extend its service life, the nested wound transformer 10 in this embodiment also includes a buffer pad 18. The first pad portion of the buffer pad 18 presses against the upper end face of the insulating tape 12 on the cover plate 111 and the upper magnetic plate 1311, and the second pad portion of the buffer pad 18 presses against the upper end face of the cover plate 111 and the upper magnetic plate 1311. Thus, even if the cover plate 111 of the protective cover 11 is hit or rubbed by other components, the external impact force is buffered after being transmitted to the buffer pad 18, thereby preventing damage to the upper magnetic plate 1311 and further improving the safety of product use.

[0041] Specifically, in this embodiment, the buffer pad 18 is bonded to the cover plate 111 by a first adhesive layer (not shown), and in this embodiment, the buffer pad 18 is bonded to the upper end face of the insulating tape 12 on the upper magnetic plate 1311 and the upper end face of the upper magnetic plate 1311 by a second adhesive layer (not shown), thereby making the protective cover 11 and the buffer pad 18 securely and reliably installed on the upper magnetic plate 1311 to ensure the protective function of the protective cover 11 and the buffer pad 18.

[0042] Furthermore, in this embodiment, the buffer pad 18 is made of elastic silicone. Elastic silicone has good adhesion, cushioning, and thermal conductivity, thereby improving the thermal conductivity and cushioning performance. It also has good insulation properties, which can ensure safety performance.

[0043] To improve heat dissipation and enhance product performance, in this embodiment, a first wire-passing groove 16222 and two first heat dissipation grooves 16221 are provided through the first side of the lower baffle 1622 in the axial direction of the magnetic pillars 1312 and 1322. The inlet and outlet ends 1711 of the inner coil 171 pass through the first wire-passing groove 16222. The two first heat dissipation grooves 16221 are symmetrically arranged about the first wire-passing groove 16222. Furthermore, in this embodiment, two second wire-passing grooves 16221 are provided through the second side of the lower baffle 1622 in the axial direction of the magnetic pillars 1312 and 1322. The upper baffle 1612 has a second heat dissipation slot 16223 and a second heat dissipation slot 16224. The two second wire guide slots 16223 are symmetrically arranged about the second heat dissipation slot 16224. The inlet end 1721 of the outer coil 172 passes through one second wire guide slot 16223, and the outlet end 1722 of the outer coil 172 passes through the other second wire guide slot 16223. Since the second heat dissipation slot 16224 is arranged between the two second wire guide slots 16223, a sufficient safe distance is ensured between the inlet end and the outlet end of the outer coil 172, thereby improving safety performance. Specifically, in this embodiment, the upper baffle 1612 has multiple third heat dissipation slots 16123, thereby improving the heat dissipation effect.

[0044] To meet the requirements of product performance and safety, the wire diameter of the inner coil 171 in this embodiment is larger than that of the outer coil 172. Furthermore, the inner coil 171 has one winding layer, while the outer coil 172 has two winding layers.

[0045] Combination Figures 3 to 9 In this embodiment, the frame 16 includes a first support 161 and a second support 162. The first support 161 includes an upper baffle 1612, an outer cylindrical ring 1611, and a first inner baffle 1613. The upper baffle 1612 and the first inner baffle 1613 are respectively connected to the upper and lower ends of the outer cylindrical ring 1611. The second support 162 includes a lower baffle 1622, an inner cylindrical ring 1621, and a second inner baffle 1623. The second inner baffle 1623 and the lower baffle 1622 are respectively connected to the upper and lower ends of the inner cylindrical ring 1621, and the second inner baffle 1623 abuts against the inner end face of the upper baffle 1612 and is adjacent to the lower baffle 1623. 622. An inner annular cavity 163 is formed between the inner ring 1621 and the outer ring 1611. The first inner baffle 1613 abuts against the inner end face of the lower baffle 1622 and forms an outer annular cavity 164 between the outer ring 1611 and the upper baffle 1612. The upper baffle 1612 has a slot 16122 that extends through the magnetic columns 1312 and 1322 in the axial direction. The second inner baffle 1623 is provided with a buckle 16231. The protruding part of the buckle 16231 extends out of the slot 16122 and hooks onto the upper end face of the upper baffle 1612, making assembly more convenient, saving time and reducing production costs.

[0046] To further improve assembly convenience, in this embodiment, the magnetic pillars 1312 and 1322 include a first support pillar 1312 and a second support pillar 1322, and a magnetic arm 1313 and 1323 include a first support arm 1313 and a second support arm 1323. The first support pillar 1312 and the two first support arms 1313 are disposed on the inner end face of the upper magnetic plate 1311, and the second support pillar 1322 and the two second support arms 1323 are disposed on the inner end face of the lower magnetic plate 1321. The first support pillar 1312 and the second support pillar 1322 abut against each other axially in the inner cylindrical ring 1621, and one first support arm 1313 abuts against one second support arm 1323 axially in the inner cylindrical ring 1621. By disassembling the magnetic core 13 of this embodiment into two parts, namely the first core 131 and the second core 132, the assembly and production convenience of the nested wound transformer 10 of this embodiment can be improved, thereby improving production efficiency.

[0047] To ensure the stability and reliability of the first core 131 and the second core 132 assembled into the magnetic core 13, in this embodiment, a first arm 1313 of the first core 131 and a second arm 1323 of the second core 132 are fixedly connected by epoxy resin adhesive 14 at the position where they abut against each other in the axial direction of the inner ring 1621. Epoxy resin adhesive 14 has advantages such as high bonding strength, high temperature resistance, and good thermal conductivity.

[0048] To improve the installation stability and reliability of the upper magnetic plate 1311, in this embodiment, two first limiting plates 16121 protrude from the upper end face of the upper baffle 1612. A first limiting groove (not shown) is formed between the two first limiting plates 16121 and the upper baffle 1612. The inner end of the upper magnetic plate 1311 is located within the first limiting groove, which limits the movement of the upper magnetic plate 1311. Specifically, in this embodiment, the two first limiting plates 16121 are arranged opposite to the upper magnetic plate 1311 and form an installation gap 191 between them and the periphery of the upper magnetic plate 1311. The cover ring wall 112 of the protective cover 11 is embedded within the installation gap 191, thereby ensuring the reliability of the protection.

[0049] To improve the installation stability and reliability of the lower magnetic plate 1321, in this embodiment, two second limiting plates 16225 are protruding from the lower end face of the lower baffle 1622. A second limiting groove (not shown) is formed between the two second limiting plates 16225 and the lower baffle 1622. The inner end of the lower magnetic plate 1321 is located within the second limiting groove, which limits the movement of the lower magnetic plate 1321. Specifically, in this embodiment, the two second limiting plates 16225 are arranged opposite to the lower magnetic plate 1321 and form a heat dissipation gap 192 between them and the periphery of the lower magnetic plate 1321, thereby improving the heat dissipation effect.

[0050] The above embodiments are merely preferred examples of this utility model and are not intended to limit the scope of implementation of this utility model. Therefore, all equivalent changes or modifications made to the structure, features and principles of this utility model patent application should be included within the scope of this utility model patent application.

Claims

1. An embedded wound transformer, comprising a frame and a magnetic core, the frame comprising an upper baffle, an inner cylindrical ring, an outer cylindrical ring, and a lower baffle, the upper baffle and the lower baffle respectively disposed at the upper and lower ends of the inner cylindrical ring and the outer cylindrical ring, the outer cylindrical ring sleeved on the outer periphery of the inner cylindrical ring and forming an inner annular cavity with the inner cylindrical ring, the outer cylindrical ring forming an outer annular cavity with an open outer periphery between the upper baffle and the lower baffle, the magnetic core comprising a magnetic column, an upper magnetic plate, a lower magnetic plate, and two magnetic arms, the upper magnetic plate being located at the upper end of the upper baffle, the lower magnetic plate being located at the lower end of the lower baffle, the magnetic column being located within the cylindrical hole of the inner cylindrical ring and disposed between the upper magnetic plate and the lower magnetic plate, the two magnetic arms being respectively located on opposite sides of the outer annular cavity and disposed between the upper magnetic plate and the lower magnetic plate, and the outer surfaces of the upper magnetic plate, the lower magnetic plate, and the two magnetic arms being wrapped with insulating tape, characterized in that: The nested wound transformer further includes an inner coil, an outer coil, an insulating layer, and a protective cover. The inner coil is wound inside the inner ring cavity, and the input and output ends of the inner coil protrude through the first side of the lower baffle. The outer coil is wound inside the outer ring cavity, and the input and output ends of the outer coil protrude through the second side of the lower baffle. The second side of the lower baffle and the first side of the lower baffle are positioned opposite each other with respect to the magnetic core. The insulating layer is sleeved on the outer periphery of the outer coil. The protective cover includes a cover plate and a cover ring wall connected to the periphery of the cover plate. The cover plate is adapted to cover the upper end surface of the insulating tape on the upper magnetic plate. The cover ring wall is sleeved on the upper outer periphery of the upper magnetic plate and the upper outer side of the insulating tape.

2. The nested wound transformer according to claim 1, characterized in that: The nested wound transformer also includes a buffer pad, the first pad portion of which abuts against the upper end face of the insulating tape on the cover plate and the upper magnetic plate, and the second pad portion of which abuts against the upper end face of the cover plate and the upper magnetic plate.

3. The nested wound transformer according to claim 2, characterized in that: The cushioning pad is bonded to the cover plate by a first adhesive layer; And / or, the buffer pad is bonded to the upper end face of the insulating tape on the upper magnetic plate and the upper end face of the upper magnetic plate by a second adhesive layer; And / or, the cushioning pad is made of elastic silicone.

4. The nested wound transformer according to claim 1, characterized in that: The first side of the lower baffle is provided with a first wire passage groove and two first heat dissipation grooves through the magnetic column in the axial direction. The inlet and outlet ends of the inner coil pass through the first wire passage groove, and the two first heat dissipation grooves are symmetrically arranged about the first wire passage groove. And / or, the second side of the lower baffle is provided with two second wire passing slots and one second heat dissipation slot through the axial direction of the magnetic column. The two second wire passing slots are symmetrically arranged about the second heat dissipation slot. The inlet end of the outer coil passes through one of the second wire passing slots, and the outlet end of the outer coil passes through the other second wire passing slot.

5. The nested wound transformer according to claim 1, characterized in that: The inner coil has a larger wire diameter than the outer coil. And / or, the inner coil has one winding layer and the outer coil has two winding layers.

6. The nested wound transformer according to claim 1, characterized in that: The frame includes a first support and a second support. The first support includes an upper baffle, an outer cylindrical ring, and a first inner baffle. The upper baffle and the first inner baffle are respectively connected to the upper and lower ends of the outer cylindrical ring. The second support includes a lower baffle, an inner cylindrical ring, and a second inner baffle. The second inner baffle and the lower baffle are respectively connected to the upper and lower ends of the inner cylindrical ring. The second inner baffle abuts against the inner end face of the upper baffle and forms the inner ring cavity between the lower baffle, the inner cylindrical ring, and the outer cylindrical ring. The first inner baffle abuts against the inner end face of the lower baffle and forms the outer ring cavity between the outer cylindrical ring and the upper baffle. The upper baffle is provided with a slot extending through the magnetic column in the axial direction. The second inner baffle is provided with a buckle. The protruding part of the buckle extends out of the slot and hooks onto the upper end surface of the upper baffle.

7. The nested wound transformer according to claim 1, characterized in that: The magnetic column includes a first support column and a second support column, and the magnetic arm includes a first arm and a second arm. The first support column and two first arms are disposed on the inner end face of the upper magnetic plate, and the second support column and two second arms are disposed on the inner end face of the lower magnetic plate. The first support and the second support abut against each other in the axial direction of the inner cylinder ring, and one of the first support arms abut against one of the second support arms in the axial direction of the inner cylinder ring.

8. The nested wound transformer according to claim 7, characterized in that: The first arm and the second arm are fixedly connected by epoxy resin at the position where they abut against each other in the axial direction of the inner cylinder ring.

9. The nested wound transformer according to any one of claims 1 to 8, characterized in that: The upper end face of the upper baffle is provided with two first limiting plates, and the two first limiting plates and the upper baffle form a first limiting groove, and the inner end of the upper magnetic plate is located in the first limiting groove. And / or, the lower end face of the lower baffle is provided with two second limiting plates, and the two second limiting plates and the lower baffle form a second limiting groove, and the inner end of the lower magnetic plate is located in the second limiting groove.

10. The nested wound transformer according to claim 9, characterized in that: The two first limiting plates are arranged opposite to the upper magnetic plate and form an installation gap between them and the periphery of the upper magnetic plate, and the cover ring wall is embedded in the installation gap; And / or, the two second limiting plates are disposed opposite to the lower magnetic plate and form a heat dissipation gap between them and the periphery of the lower magnetic plate.

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