Framework and power transformer

Abstract

The utility model belongs to the technical field of power transformers, and discloses a skeleton and a power transformer, the skeleton comprises a wrapping part and two pin parts located at two ends of the wrapping part, the wrapping part is provided with a first slot, the first slot is used for accommodating a magnetic core, one side, far away from the wrapping part, of each pin part is provided with a second slot, and the second slots are used for accommodating pins. The pin part is provided with a lead groove, the lead groove is used for accommodating an enameled wire, the top wall of the lead groove is composed of an inclined surface and an arc surface which are in smooth transition connection, the arc surface is in smooth transition to the side surface, facing the wrapping part, of the pin part, the inclined surface obliquely extends to one side of the second slot, and the included angle between the inclined surface and the side surface, facing the wrapping part, of the pin part is larger than 90 degrees. The top wall structure of the lead groove of the framework is improved, the framework is prevented from cutting off enameled wires through right-angle sides, and normal operation of the power transformer is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of power transformers, in particular to a skeleton and a power transformer. Background Art

[0002] The power transformer plays the functions of power transmission, voltage conversion and insulation isolation in the power system. The main components include primary coil, secondary coil, magnetic core, input pin, output pin and frame. The primary coil is wound around the circumference of the frame and connected to the input pin, and the secondary coil is wound around the circumference of the frame and connected to the output pin. The voltage conversion is achieved by using the principle of electromagnetic induction.

[0003] However, the skeleton of the power transformer is easy to cut the enameled wire, especially at the right-angled side of the skeleton. For example, the announcement number is CN114156067B, which is a power transformer that has passed the VDE and CB tests. In this power transformer, the winding group is wound around the middle of the skeleton structure and one end of the winding group is connected to the pin. The end of the winding group connected to the pin is in contact with the right-angled side of the skeleton structure. The power transformer and the equipment installed with the power transformer generate heat during operation. Due to the deformation of the skeleton structure due to heat, the right-angled side of the skeleton structure is easy to cut the winding group, causing the power transformer to fail. Utility Model Content

[0004] The purpose of the utility model is to provide a skeleton and a power transformer, improve the top wall structure of the lead trough, prevent the skeleton from cutting the enameled wire with the right-angle edge, and ensure the normal operation of the power transformer.

[0005] To achieve this purpose, the present invention adopts the following technical solutions:

[0006] In a first aspect, a skeleton is provided, which includes a wrapping portion and two pin portions located at both ends of the wrapping portion, the wrapping portion is provided with a first slot, the first slot is used to accommodate a magnetic core, the pin portion is provided with a second slot on a side away from the wrapping portion, the second slot is used to accommodate a pin, the pin portion is provided with a lead groove, the lead groove is used to accommodate enameled wire, the top wall of the lead groove is composed of an inclined surface and an arc surface connected by a smooth transition, the arc surface smoothly transitions to the side of the pin portion facing the wrapping portion, the inclined surface extends obliquely to one side of the second slot, and the angle between the side of the pin portion facing the wrapping portion and the inclined surface is greater than 90 degrees.

[0007] As an optional technical solution, the two pin portions are symmetrically arranged with respect to the wrapping portion.

[0008] As an optional technical solution, the first slot is located on the same side of the two pin portions, and the first slot is away from the lead groove.

[0009] As an optional technical solution, the pin portion includes a pin layer, a bearing layer and a limiting layer arranged in sequence, the second slot is located on the side of the pin layer away from the wrapping portion, the lead slot is located on the side of the pin layer away from the bearing layer, one end of the wrapping portion abuts against the bearing layer and the limiting layer at the same time, and the limiting layer is provided with an avoidance opening aligned with the first slot.

[0010] As an optional technical solution, a material-shortage opening is provided on a side of the bearing layer away from the wrapping portion.

[0011] As an optional technical solution, the bottom of the pin portion is provided with at least two rows of raised layers spaced apart along a first direction, and the lead groove extending along a second direction is provided between two adjacent rows of raised layers, and the first direction is perpendicular to the second direction.

[0012] As an optional technical solution, the elevated layer includes at least two bosses spaced apart along the second direction.

[0013] As an optional technical solution, the second slot and the lead slot are staggered.

[0014] As an optional technical solution, the second slot is aligned with the boss, and the boss farthest from the wrapping portion intersects with the plane where the second slot is located.

[0015] In a second aspect, a power transformer is provided, comprising a magnetic core, pins, enameled wire and the frame as described above, wherein the magnetic core is inserted into a first slot of the frame, the pins are inserted into a second slot of the frame, the enameled wire is wound around the winding portion, and a section of the enameled wire passes through a lead slot of the frame and is connected to the pins.

[0016] Beneficial effects of the utility model:

[0017] The utility model provides a skeleton and a power transformer, wherein the skeleton includes a wrapping portion and two pin portions located at both ends of the wrapping portion. The wrapping portion is provided with a first slot for accommodating a magnetic core. The pin portion is provided with a second slot on a side away from the wrapping portion for accommodating a pin. The pin portion is provided with a lead groove for accommodating an enameled wire. The top wall of the lead groove is composed of an inclined surface and an arc surface that are smoothly connected. The arc surface smoothly transitions to the side of the pin portion facing the wrapping portion. The inclined surface extends obliquely to one side of the second slot. The angle between the inclined surface and the side of the pin portion facing the wrapping portion is greater than 90 degrees. When assembling and producing the power transformer, the pin inserted into the second slot of one of the pin portions serves as an input pin, and the pin inserted into the second slot of the other pin portion serves as an output pin. The enameled wire used as the primary coil is wound around the wrapping portion, passes through the lead groove of one of the pin portions, and is connected to the input pin. The enameled wire used as the secondary coil is wound around the wrapping portion, passes through the lead groove of the other pin portion, and is connected to the output pin.

[0018] The second slot is set on the side of the pin part away from the wrapping part, which extends the distance between the pin and the magnetic core, as well as the distance between the input pin and the output pin, thereby extending the creepage distance and increasing the voltage resistance.

[0019] The present application utilizes the lead groove to isolate and protect the enameled wire, and the enameled wire located between the pin and the wrapping portion can be accommodated in the lead groove, reducing the risk of being torn off by external components.

[0020] When the enameled wire passes through the lead groove, the enameled wire abuts against the top wall of the lead groove. The layout shape of the enameled wire in the lead groove is adapted to the shape of the top wall of the lead groove. The enameled wire smoothly transitions from the lead groove to the wrapping part, which can prevent the enameled wire from being cut at the transition position between the lead groove and the wrapping part. Even if the skeleton expands due to heat, it can prevent the skeleton from cutting the enameled wire with the right-angle edge.

[0021] The inclined surface extends obliquely to one side of the second slot, and the angle between the inclined surface and the side surface of the pin portion facing the wrapping portion is greater than 90 degrees. The force on the enameled wire on the arc surface is more dispersed, the arc surface acts as a buffer, and the enameled wire is less likely to break. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a bottom view of the power transformer of the utility model;

[0023] Figure 2 yes Figure 1 Cross-sectional view of section AA;

[0024] Figure 3 This is a structural diagram of the power transformer of the utility model from another perspective;

[0025] Figure 4This is a structural diagram of the power transformer of the present utility model from another perspective.

[0026] In the picture:

[0027] 100, skeleton; 200, pins;

[0028] 1. Wrapping portion; 11. First slot;

[0029] 2. Pin portion; 21. Lead groove; 211. Inclined surface; 212. Arc surface; 22. Pin layer; 23. Bearing layer; 231. Material-missing opening; 24. Limiting layer; 25. Boss. DETAILED DESCRIPTION

[0030] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0031] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0032] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0033] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0034] like Figures 1 to 4 As shown, this embodiment provides a power transformer, which includes a magnetic core, pins 200, enameled wire, and a bobbin 100. The magnetic core is inserted into a first slot 11 of the bobbin 100, the pins 200 are inserted into a second slot of the bobbin 100, the enameled wire is wound around a winding portion 1, and a section of the enameled wire passes through a lead slot 21 of the bobbin 100 and is connected to the pins 200. The magnetic core and enameled wire are existing components and are not shown in this embodiment.

[0035] The skeleton 100 of this embodiment includes a wrapping portion 1 and two pin portions 2 located at both ends of the wrapping portion 1. The wrapping portion 1 is provided with a first slot 11, which is used to accommodate a magnetic core. The pin portion 2 is provided with a second slot on a side away from the wrapping portion 1, which is used to accommodate a pin 200. The pin portion 2 is provided with a lead groove 21, which is used to accommodate an enameled wire. The top wall of the lead groove 21 is composed of an inclined surface 211 and an arc surface 212 connected by a smooth transition. The arc surface 212 smoothly transitions to the side of the pin portion 2 facing the wrapping portion 1. The inclined surface 211 extends obliquely to one side of the second slot. The angle between the side of the pin portion 2 facing the wrapping portion 1 and the inclined surface 211 is greater than 90 degrees.

[0036] Specifically, when assembling and producing the power transformer, the pin 200 inserted into the second slot of one of the pin parts 2 is used as the input pin, and the pin 200 inserted into the second slot of the other pin part 2 is used as the output pin. The enameled wire used as the primary coil is wound around the winding part 1, passes through the lead groove 21 of one of the pin parts 2, and is connected to the input pin. The enameled wire used as the secondary coil is wound around the winding part 1, passes through the lead groove 21 of the other pin part 2, and is connected to the output pin.

[0037] The second slot is arranged on a side of the pin portion 2 away from the wrapping portion 1 , thereby extending the distance between the pin 200 and the magnetic core, and the distance between the input pin and the output pin, thereby extending the creepage distance and increasing the voltage resistance.

[0038] The present application utilizes the lead groove 21 to isolate and protect the enameled wire. The enameled wire located between the pin 200 and the wrapping portion 1 can be accommodated in the lead groove 21 , and the risk of being torn off by external components is reduced.

[0039] When the enameled wire passes through the lead groove 21, the enameled wire abuts against the top wall of the lead groove 21. The layout shape of the enameled wire in the lead groove 21 is adapted to the shape of the top wall of the lead groove 21. The enameled wire smoothly transitions from the lead groove 21 to the wrapping part 1, which can prevent the enameled wire from being cut at the transition position between the lead groove 21 and the wrapping part 1. Even if the skeleton 100 expands due to heat, it can prevent the skeleton 100 from cutting the enameled wire using the right-angle edge.

[0040] The inclined surface 211 extends obliquely to one side of the second slot, and the angle between the side surface of the pin portion 2 facing the wrapping portion 1 and the inclined surface 211 is greater than 90 degrees. The force on the enameled wire on the arc surface 212 is more dispersed, and the arc surface 212 acts as a buffer, making the enameled wire less likely to break.

[0041] When the skeleton 100 is placed horizontally, the side of the pin portion 2 facing the wrapping portion 1 is a vertical surface, the symmetry center line of the two pin portions 2 passes through the center of the wrapping portion 1, the inclined surface 211 is inclined toward the symmetry center line of the two pin portions 2, and the angle between the inclined surface 211 and the vertical surface of the pin portion 2 is greater than 90 degrees.

[0042] In practical applications, the skeleton 100 of this embodiment is an EFD15-series product skeleton.

[0043] In this embodiment, the wrapping portion 1 and the two pin portions 2 are integrally provided.

[0044] In this embodiment, the two pin portions 2 are symmetrically arranged with respect to the wrapping portion 1. The distance between the input pin and the output pin is lengthened, thereby extending the electrical clearance and creepage distance.

[0045] Optionally, the first slot 11 is located on the same side of the two pin portions 2 , and the first slot 11 is away from the lead groove 21 .

[0046] The power transformer of this embodiment is installed on a circuit board, and the input pins and output pins are fixed to the circuit board by welding. The pin portion 2 abuts against the circuit board, and the wrapped portion 1 is away from the circuit board. The distance between the first slot 11 and the circuit board is increased, the height of the skeleton 100 is increased, and the electrical gap between the enameled wire and the circuit board is increased to ensure the voltage resistance effect.

[0047] Optionally, the pin portion 2 includes a pin layer 22, a bearing layer 23 and a limiting layer 24 arranged in sequence, the second slot is located on the side of the pin layer 22 away from the wrapping portion 1, the lead groove 21 is located on the side of the pin layer 22 away from the bearing layer 23, one end of the wrapping portion 1 simultaneously abuts against the bearing layer 23 and the limiting layer 24, and the limiting layer 24 is provided with an avoidance opening aligned with the first slot 11.

[0048] When the enameled wire is wound on the wrapping portion 1 , the limiting layer 24 can ensure that the enameled wire will not separate from the wrapping portion 1 , and the limiting layer 24 plays a role in limiting the enameled wire.

[0049] The power transformer of the embodiment can be installed before or after the circuit board, and the enameled wire in the lead slot 21 can be fixed by injecting glue into the lead slot 21, so that the enameled wire in the lead slot 21 is prevented from being pulled by other components.

[0050] Optionally, the bearing layer 23 is provided with a material missing opening 231 on the side away from the wrapping part 1, so as to reduce material.

[0051] Optionally, the bottom of the pin part 2 is provided with at least two rows of raised layers arranged along a first direction, and the lead slot 21 extending along a second direction is arranged between the two adjacent rows of raised layers, and the first direction is perpendicular to the second direction.

[0052] When the power transformer is installed on the circuit board, the raised layer abuts against the circuit board, the distance between the wrapping part 1 and the circuit board is increased, the height of the framework 100 is increased, the electrical gap between the enameled wire and the circuit board is increased, and the withstand voltage effect is ensured.

[0053] Optionally, the raised layer comprises at least two bosses 25 arranged along the second direction, and the bosses 25 are arranged at intervals, so as to facilitate the flow of glue and improve production efficiency.

[0054] Optionally, the second insertion slot is arranged in a staggered manner with the lead slot 21. When the pin 200 is welded on the circuit board, the temperature of the pin 200 is relatively high and the pin 200 may move. In order to avoid affecting the glue in the lead slot 21 during the welding process, the second insertion slot is arranged in a staggered manner with the lead slot 21 in the embodiment, so that the pin 200 is arranged in a staggered manner with the lead slot 21, and the pin 200 is not aligned with the lead slot 21. Therefore, the welding of the pin 200 on the circuit board basically does not affect the glue in the lead slot 21.

[0055] Optionally, the second insertion slot is arranged in alignment with the boss 25, and the boss 25 farthest from the wrapping part 1 intersects with the plane where the second insertion slot is located. The pin 200 inserted into the second insertion slot is arranged in alignment with the boss 25, the boss 25 abuts against the circuit board, and the boss 25 is not affected by the pin 200.

[0056] The boss 25 farthest from the wrapping part 1 is provided with a semicircular surface, and the semicircular surface intersects with the plane where the second insertion slot is located, which is equivalent to increasing the opening of the lead slot 21 close to one end of the pin 200, and the glue injection amount of the opening of the lead slot 21 close to one end of the pin 200 is more.

[0057] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A skeleton, characterized in that The skeleton (100) comprises a wrapping portion (1) and two pin portions (2) located at both ends of the wrapping portion (1); the wrapping portion (1) is provided with a first slot (11), the first slot (11) being used to accommodate a magnetic core; the pin portion (2) is provided with a second slot on a side away from the wrapping portion (1), the second slot being used to accommodate a pin (200); the pin portion (2) is provided with a lead groove (21), the lead groove (21) being used to accommodate an enameled wire; the top wall of the lead groove (21) is composed of an inclined surface (211) and an arc surface (212) connected by a smooth transition; the arc surface (212) smoothly transitions to the side of the pin portion (2) facing the wrapping portion (1); the inclined surface (211) extends obliquely to one side of the second slot; the angle between the side of the pin portion (2) facing the wrapping portion (1) and the inclined surface (211) is greater than 90 degrees.

2. The skeleton according to claim 1, characterized in that The two pin portions (2) are symmetrically arranged with respect to the wrapping portion (1).

3. The skeleton according to claim 1, characterized in that The first slot (11) is located on the same side of the two pin portions (2), and the first slot (11) is away from the lead groove (21).

4. The skeleton according to claim 3, characterized in that The pin portion (2) comprises a pin layer (22), a bearing layer (23) and a limiting layer (24) which are arranged in sequence; the second slot is located on the side of the pin layer (22) away from the wrapping portion (1); the lead slot (21) is located on the side of the pin layer (22) away from the bearing layer (23); one end of the wrapping portion (1) abuts against the bearing layer (23) and the limiting layer (24) at the same time; and the limiting layer (24) is provided with an avoidance opening aligned with the first slot (11).

5. The skeleton according to claim 4, characterized in that A material-shortage opening (231) is provided on the side of the bearing layer (23) facing away from the wrapping portion (1).

6. The skeleton according to claim 1, characterized in that The bottom of the pin portion (2) is provided with at least two rows of raised layers spaced apart along a first direction, and between two adjacent rows of raised layers is provided the lead groove (21) extending along a second direction, wherein the first direction is perpendicular to the second direction.

7. The skeleton according to claim 6, characterized in that The elevated layer comprises at least two bosses (25) spaced apart along the second direction.

8. The skeleton according to claim 7, characterized in that The second slot and the lead slot (21) are arranged in a staggered manner.

9. The skeleton according to claim 8, characterized in that The second slot is aligned with the boss (25), and the boss (25) farthest from the wrapping portion (1) intersects with the plane where the second slot is located.

10. A power transformer, characterized in that The invention comprises a magnetic core, a pin (200), an enameled wire and a skeleton (100) as described in any one of claims 1 to 9, wherein the magnetic core is inserted into a first slot (11) of the skeleton (100), the pin (200) is inserted into a second slot of the skeleton (100), the enameled wire is wound around the winding portion (1), and a section of the enameled wire passes through a lead slot (21) of the skeleton (100) and is connected to the pin (200).

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