Magnetic core grounding structure of small power transformer

Abstract

This utility model discloses a magnetic core grounding structure for a small power transformer, including a frame, a magnetic core, primary pins, and secondary pins. The frame includes a winding tube, a first support plate, and a second support plate. The first and second support plates are vertically arranged at both ends of the winding tube, and each has a square hole corresponding to the hole in the winding tube. The magnetic core is generally H-shaped, consisting of two E-shaped magnetic cores inserted opposite each other at both ends of the frame. A horizontally arranged primary pin plate is located on the lower side of the first support plate, and a horizontally arranged secondary pin plate is located on the lower side of the second support plate. The primary pins are vertically arranged on the primary pin plate, and the secondary pins are vertically arranged on the secondary pin plate. Each secondary pin includes a grounding pin, one end of which passes through the secondary pin plate and abuts against the magnetic core. This utility model reduces the transformer manufacturing process, improves production efficiency, significantly increases the product yield, and reduces raw material costs.

Description

Technical Field

[0001] This utility model relates to the field of transformer technology, and in particular to a magnetic core grounding structure for a small 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 magnetic core. In electrical equipment and wireless circuits, they are commonly used for voltage step-up / step-down, impedance matching, and safety isolation.

[0003] Typically, in small and medium-sized transformers, the transformer core needs to be grounded to achieve a shielding effect and reduce interference from leakage magnetic fields on surrounding electrical appliances and equipment. During transformer operation, the presence of a magnetic field generates a certain amount of leakage magnetic field, which can have adverse electromagnetic effects on surrounding electrical equipment, leading to equipment malfunctions or damage. To reduce this impact, the transformer core can be grounded, eliminating or reducing the leakage magnetic field and thus ensuring the safety and stability of the equipment.

[0004] Currently, small power transformers use a grounding method where copper wire is wrapped around the grounding pin, tinned, and then the lead wire is attached to the magnetic core to achieve a shielding effect. This method of grounding the transformer core requires two additional production processes in transformer manufacturing, reducing production efficiency. During production, the lead wire is also prone to breakage, reducing the product yield. Furthermore, it consumes a certain amount of copper wire and tin, increasing raw material costs. Summary of the Invention

[0005] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a magnetic core grounding structure for a small power transformer that can not only reduce the production process and improve production efficiency when producing small power transformers, but also improve the product yield, reduce raw material costs, and has a simple structure.

[0006] To solve the above technical problems, the present utility model adopts a magnetic core grounding structure for a small power transformer, which includes a skeleton, a magnetic core, primary pins and secondary pins. The skeleton includes a bobbin, a first support plate and a second support plate. The bobbin is a hollow square tube, and a coil is wound around the bobbin. The first support plate and the second support plate are respectively vertically arranged at both ends of the bobbin. The first support plate and the second support plate are respectively provided with square holes corresponding to the holes of the bobbin. The magnetic core is in an overall shape of a "day" character and is formed by two E-shaped magnetic cores respectively inserted opposite to each other at both ends of the skeleton. A horizontally arranged primary pin plate is provided on the lower side of the first support plate, and a horizontally arranged secondary pin plate is provided on the lower side of the second support plate. The primary pins are vertically arranged on the primary pin plate, and the secondary pins are vertically arranged on the secondary pin plate. The secondary pins include a grounding pin, and one end of the grounding pin passes through the secondary pin plate and abuts against the magnetic core.

[0007] As a preferred embodiment of the present utility model, the grounding pin is provided with a Λ-shaped needle head at the end passing through the secondary pin plate, and the needle head abuts against the magnetic core.

[0008] As a preferred embodiment of the present utility model, a top plate is fixedly provided at the end of the grounding pin passing through the secondary pin plate, and a plurality of protrusions are provided on the top plate, and the protrusions abut against the magnetic core.

[0009] As a preferred embodiment of the present utility model, a first baffle is provided on the upper side of the first support plate, and a second baffle is provided on the upper side of the second support plate.

[0010] As a preferred embodiment of the present utility model, the bobbin, the first support plate, the second support plate, the primary pin plate and the secondary pin plate are an integrally formed whole part.

[0011] After adopting the above structure, the present utility model has the following beneficial effects:

[0012] The magnetic core grounding structure of the small power transformer of the present utility model includes a skeleton, a magnetic core, primary pins and secondary pins. The skeleton includes a bobbin, a first support plate and a second support plate. The bobbin is a hollow square tube, and a coil is wound around the bobbin. The first support plate and the second support plate are respectively vertically arranged at both ends of the bobbin. The first support plate and the second support plate are respectively provided with square holes corresponding to the holes of the bobbin. The magnetic core is integrally in a shape of "day", and is composed of two E-shaped magnetic cores respectively inserted opposite to each other at both ends of the skeleton. A horizontally arranged primary pin plate is provided on the lower side of the first support plate, and a horizontally arranged secondary pin plate is provided on the lower side of the second support plate. The primary pins are vertically arranged on the primary pin plate, and the secondary pins are vertically arranged on the secondary pin plate. The secondary pins include a grounding pin, and one end of the grounding pin passes through the secondary pin plate and abuts against the magnetic core. Thus, from the structure of the present utility model where the primary pin plate, the secondary pin plate and one end of the grounding pin pass through the secondary pin plate and abut against the magnetic core, it can be seen that the present utility model uses such a magnetic core grounding method to replace the grounding method of winding copper wire around the grounding pin, tin plating, and then attaching the lead wire to the magnetic core, reducing two technological processes for producing the transformer, improving the production efficiency. The present utility model also does not have the problem that the lead wire is easily broken during production circulation, improving the product yield rate. The present utility model reduces the consumption of copper wire and tin, reduces the raw material cost, and greatly improves the economic benefit.

[0013] One end of the grounding pin of the present utility model passing through the secondary pin plate is provided with a Λ-shaped needle head, and the needle head abuts against the magnetic core. Such a structure enables the needle head to have better contact with the magnetic core.

[0014] One end of the grounding pin of the present utility model passing through the secondary pin plate is fixedly provided with a top plate, and a plurality of protrusions are provided on the top plate, and the protrusions abut against the magnetic core. Thus, the grounding pin is not easily loosened, not easily contacted by paint, and further improves the effective contact area between the grounding pin and the magnetic core, making the magnetic core grounding better.

[0015] A first baffle is provided on the upper side of the first support plate of the present utility model, and a second baffle is provided on the upper side of the second support plate. The structure of the baffle further prevents the magnetic core from loosening, making the contact between the grounding pin and the magnetic core more reliable.

[0016] The bobbin, the first support plate, the second support plate, the primary pin plate and the secondary pin plate of the present utility model are an integrally formed whole part. Such a structure makes the structure precise, stable and reliable.

[0017] The structure of the present utility model is simple, easy to implement, simple to install and operate, and has a low manufacturing cost. Description of the Drawings

[0018] The following further elaborates on the specific embodiments of the present utility model in conjunction with the attached drawings.

[0019] Figure 1 This is a three-dimensional schematic diagram of a structure of the core grounding structure of the small power transformer of the present utility model.

[0020] Figure 2 This is a three-dimensional schematic diagram of the inverted state of the structure of the skeleton, primary pin board, secondary pin board, primary pins and secondary pins of the present utility model.

[0021] Figure 3 This is a three-dimensional schematic diagram of the structure of the secondary pin board, grounding pin, needle head and E-shaped core of the present utility model.

[0022] Figure 4 This is a three-dimensional schematic diagram of the structure of the secondary pin board, grounding pin, top board and protrusion of the present utility model. Specific Embodiments

[0023] See Figure 1 、 Figure 2 、 Figure 3 and Figure 4 As shown in a core grounding structure of a small power transformer, which includes a skeleton 1, a core 2, primary pins 3 and secondary pins 4. The skeleton 1 includes a bobbin 1-1, a first support plate 1-2 and a second support plate 1-3. The bobbin 1-1 is a hollow square tube, and a coil is wound on the bobbin 1-1. The first support plate 1-2 and the second support plate 1-3 are respectively vertically arranged at both ends of the bobbin 1-1. The first support plate 1-2 and the second support plate 1-3 are respectively provided with square holes 1-4 corresponding to the bobbin holes. The core 2 is in the shape of a "day", and is composed of two E-shaped cores 2-1 respectively inserted opposite to each other at both ends of the skeleton 1. A horizontally arranged primary pin board 5 is provided under the first support plate 1-2, and a horizontally arranged secondary pin board 6 is provided under the second support plate (1-3). The primary pins 3 are vertically arranged on the primary pin board 5, and the secondary pins 4 are vertically arranged on the secondary pin board 6. The secondary pins 4 include a grounding pin 4-1, and one end of the grounding pin 4-1 passes through the secondary pin board 6 and abuts against the core 2.

[0024] As a preferred embodiment of the present utility model, as shown in Figure 1 and Figure 3 The grounding pin 4-1 is provided with a Λ-shaped needle head 4-1-1 at the end passing through the secondary pin board, and the needle head 4-1-1 abuts against the core 2.

[0025] As a preferred embodiment of the present utility model, as shown in Figure 1 and Figure 4As shown, the grounding pin 4-1 has a top plate 4-2 fixed at one end that passes through the secondary pin plate. The top plate 4-2 has multiple protrusions 4-2-1, which abut against the magnetic core 2.

[0026] As a preferred embodiment of this utility model, such as Figure 1 and Figure 2 As shown, the first support plate 1-2 is provided with a first baffle 7 on its upper side, and the second support plate 1-3 is provided with a second baffle 8 on its upper side.

[0027] As a preferred embodiment of this utility model, such as Figure 1 and Figure 2 As shown, the winding tube 1-1, the first support plate 1-2, the second support plate 1-3, the primary pin plate 5, and the secondary pin plate 6 are integrally formed as a single piece.

[0028] After testing, it was found that in actual production, one end of the grounding pin 4-1 passes through the secondary pin plate 6, and the pin tip 4-1-1 or multiple protrusions 4-2-1 abut against one end of the magnetic core 2. The first baffle 7 and the second baffle 8 block the other end of the magnetic core 2, making the magnetic core 2 less prone to loosening. This magnetic core grounding method replaces the grounding method of wrapping copper wire around the grounding pin, tinning it, and then attaching the lead wire to the magnetic core. This saves two processes in the production of transformers, improves production efficiency, and eliminates the problem of lead wire breakage by eliminating the need for lead wire grounding, which greatly improves the product yield. At the same time, the consumption of copper wire and tin is reduced, and the raw material cost is reduced by 3%, achieving good economic benefits.

Claims

1. Magnetic core grounding structure of a small power transformer, comprising a skeleton (1), a magnetic core (2), a primary pin (3) and a secondary pin (4). The skeleton (1) includes a bobbin (1-1), a first support plate (1-2) and a second support plate (1-3). The bobbin (1-1) is a hollow square tube, and a coil is wound around the bobbin (1-1). The first support plate (1-2) and the second support plate (1-3) are respectively vertically arranged at both ends of the bobbin (1-1). The first support plate (1-2) and the second support plate (1-3) are respectively provided with square holes (1-4) corresponding to the holes of the bobbin. The magnetic core (2) is in an overall shape of a Chinese character 'Ri', and is formed by respectively and oppositely inserting two E-shaped magnetic cores (2-1) at both ends of the skeleton (1). It is characterized in that: The first support plate (1-2) has a horizontally arranged primary pin plate (5) on its lower side, and the second support plate (1-3) has a horizontally arranged secondary pin plate (6) on its lower side. The primary pin (3) is vertically arranged on the primary pin plate (5), and the secondary pin (4) is vertically arranged on the secondary pin plate (6). The secondary pin (4) includes a grounding pin (4-1). One end of the grounding pin (4-1) passes through the secondary pin plate (6) and abuts against the magnetic core (2).

2. The magnetic core grounding structure for a small power transformer according to claim 1, characterized by: The grounding pin (4-1) has a Λ-shaped needle tip (4-1-1) at one end that passes through the secondary pin plate, and the needle tip (4-1-1) abuts against the magnetic core (2).

3. The magnetic core grounding structure for a small power transformer according to claim 1, characterized by: The grounding pin (4-1) has a top plate (4-2) fixed at one end that passes through the secondary pin plate. The top plate (4-2) has multiple protrusions (4-2-1) that abut against the magnetic core (2).

4. The magnetic core grounding structure for a small power transformer according to claim 1, characterized by: The first support plate (1-2) is provided with a first baffle (7) on its upper side, and the second support plate (1-3) is provided with a second baffle (8) on its upper side.

5. The magnetic core grounding structure for a small power transformer according to claim 1, characterized by: The winding tube (1-1), the first support plate (1-2), the second support plate (1-3), the primary pin plate (5), and the secondary pin plate (6) are integrally formed as a single piece.

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