CN104505223A - Improved structure of magnetic cores and winding framework - Google Patents

Abstract

The invention discloses an improved structure of a magnetic core and a winding bobbin, comprising a pair of magnetic cores, a winding bobbin and a coil of a winding group, the coil is wound in the slot of the winding bobbin, and the magnetic core of the pair of magnetic cores The column pair is set into the center hole of the winding frame. The magnetic core is provided with a ring wall to surround the coil of the winding group and the winding frame. The ring wall of the magnetic core is provided with a window. Foot support, any one or both of the pair of magnetic cores are provided with diversion and heat dissipation grooves on the inner bottom surface, one end of the diversion and heat dissipation grooves leads to the window, and the other end leads to the inside of the magnetic core, splints at any one or both ends of the winding skeleton There is a notch on the top corresponding to the diversion heat sink; this structure is conducive to the infiltration of insulating varnish into the gap between the parts of the inductor or transformer at the same time, effectively improving the insulation performance and vibration noise, and is also conducive to the winding of the winding group. The heat dissipation of the inner layer and the column in the magnetic core improves the heat dissipation performance; the invention has a simple structure and can be widely applied to various inductors or transformers.

Description

An Improved Structure of Magnetic Core and Winding Skeleton

technical field

The invention relates to a magnetic core and a winding bobbin for an inductor or a transformer, in particular to an improved structure of the magnetic core and the winding bobbin.

Background technique

At present, the common split inductors or transformers on the market are usually composed of a magnetic core, a winding bobbin and a winding group coil. The magnetic core is provided with a ring wall to surround the winding group coil and the winding bobbin to reduce magnetic flux leakage and improve Shielding performance; in the process of manufacturing inductors or transformers, it is usually required to be dipped in paint, that is, insulating varnish is wrapped around the winding coil to protect the coil, and the insulating varnish is cured to help the entire product bond together to increase mechanical strength . In the prior art, the insulating varnish penetrates into the inductor or transformer through the window on the ring wall of the magnetic core, and since the winding coil usually uses multi-strand wires, it is difficult for the insulating varnish to penetrate evenly in this way To the inner layer of the coil and between the winding bobbin and the magnetic core, it will cause some inner layer coils to lack insulating varnish wrapping and affect the insulation effect. There are still gaps between parts, which will cause low-frequency vibration noise, noise or howling when the inductor or transformer is working.

On the other hand, the heat generated during the operation of the inductor or transformer is not enough to achieve a good heat dissipation effect only through the window opened on the ring wall of the magnetic core, especially the inner coil and the middle column of the magnetic core far away from the window end. If the inductor or transformer operates at a higher temperature for a long time, it will cause the insulation layer of the winding coil to age and become embrittled, which will easily cause a short circuit between turns of the winding group coil, and even burn the winding group coil in serious cases; at the same time, the inductor or Excessive temperature rise of the transformer will also lead to magnetic saturation, which is also prone to burnout, affecting the service life of the product.

To sum up, how to improve the insulation performance and vibration noise of inductors or transformers, and at the same time improve their heat dissipation performance is an urgent problem that practitioners need to solve.

Contents of the invention

In order to overcome the shortcomings of the prior art, the invention provides an improved structure of the magnetic core and the winding bobbin.

The technical solution adopted by the present invention to solve its technical problems is:

An improved structure of a magnetic core and a winding bobbin, comprising a pair of magnetic cores, a winding bobbin and a winding group coil, the winding group coil is wound in the slot of the winding bobbin, the pair of magnetic The center column of the magnetic core of the core is fitted into the central hole of the winding skeleton, the magnetic core is provided with a ring wall to surround the winding group coil and the winding skeleton, and the magnetic core ring wall is provided with a window , the winding frame protrudes outward from the window to have a pole foot bracket, and the inner bottom surface of any one or both of the pair of magnetic cores is provided with a flow-guiding heat sink, and one end of the flow-guiding heat sink is connected to the Facing the window, the other end leads to the inside of the magnetic core, and a notch is opened on the plywood at any one or both ends of the winding bobbin corresponding to the conduction and heat dissipation groove.

One end of the conduction and heat dissipation groove leading to the inside of the magnetic core extends to the middle column of the magnetic core.

The slot opened by the splint of the winding frame extends to the wall of the central hole of the winding frame.

The end surface of the notch is provided with a positioning protrusion, and the protrusion is snapped into the flow guiding and cooling groove to position the magnetic core and the winding frame.

The beneficial effect of the present invention is: the present invention is provided with diversion cooling groove on the inner bottom surface of any one or both of a pair of magnetic cores, one end of the diversion cooling groove leads to the window, the other end extends to the inside of the magnetic core, the winding There are notches at the corresponding places of the plywood at any one or both ends of the splint and the diversion heat sink. The insulating varnish can not only penetrate into the inductor or transformer through each window, but also penetrate through the notch of the diversion heat sink and the winding frame. Between the inner layer of the coil of the winding group and the winding frame and the magnetic core, the inner layer and the outer layer of the coil can be evenly wrapped with insulating varnish at the same time, thereby strengthening the insulation capacity of the coil of the winding group and maximizing the enamel coating. Protective function to prevent inter-turn short circuit of winding; and the insulating varnish is evenly and fully filled in the gaps of parts such as magnetic core, winding frame and winding group coil, which is beneficial to fix the relative position of each part after the insulating varnish is baked and cured, preventing It produces vibration noise and noise or howling when working, and helps to strengthen the mechanical strength of the whole product. On the other hand, the diversion heat dissipation grooves and notches leading to the inside of the magnetic core have opened a new heat dissipation channel, which facilitates the heat dissipation from the inner coil and the middle column of the magnetic core away from the window end, and improves the heat dissipation inside the inductor or transformer. , which is conducive to further ensuring the service life of the product.

Description of drawings

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

Fig. 1 is a schematic diagram of structural decomposition of the present invention;

Fig. 2 is the overall combination schematic diagram of the present invention;

Fig. 3 is a schematic cross-sectional view of the present invention;

Fig. 4 is a cross-sectional view along line A-A of Fig. 3 .

Detailed ways

With reference to Fig. 1, Fig. 2, a kind of magnetic core and the improved structure of bobbin of winding, comprise a pair of magnetic core 1, bobbin of winding 2 and winding group coil 3, winding group coil 3 is wound on the wire of winding bobbin 2 In the groove 24, the core columns 13 of a pair of magnetic cores 1 are fitted into the central hole 25 of the winding frame 2, and the magnetic core 1 is provided with a ring wall 14 to surround the winding group coil 3 and the winding frame 2, The magnetic core ring wall 14 is provided with a window 11, and the winding frame 2 protrudes outward from the window 11 to have a pole foot bracket 23, and the inner bottom surface of any one or both of the pair of magnetic cores 1 is provided with a flow guide and heat dissipation groove 12, One end of the diversion heat sink 12 leads to the window 11 , and the other end leads to the inside of the magnetic core 1 . A notch 21 is provided on the splint 26 corresponding to the diversion heat sink 12 at any one or both ends of the winding bobbin 2 .

After the inductor or transformer of the present invention is assembled, the entire product needs to be immersed in insulating varnish. The insulating varnish can not only penetrate into the inductor or transformer from the windows 11 at each end of the magnetic core 1, but also pass through the conduction and heat dissipation grooves 12 and the grooves. The mouth 21 penetrates into the inner layer of the coil 3 of the winding group, so that the inner layer and the outer layer of the coil composed of multi-strand wires can be evenly penetrated into the insulating varnish at the same time, which strengthens the insulation capacity of the coil 3 of the winding group and protects the enamelled layer. To maximize the protective effect, prevent inter-turn short circuit of the winding, and the conduction cooling groove 12 and the notch 21 make it easier for the insulating varnish to penetrate between the magnetic core 1 and the winding bobbin 2, and evenly fill the magnetic core 1, The gap between the winding frame 2 and the winding group coil 3 is conducive to bonding the whole product together to form a solid whole after the insulating paint is baked and cured, preventing the parts from moving with each other to generate low-frequency vibration noise and working. Make noise or howling, and improve the mechanical strength of the product at the same time. On the other hand, the diversion cooling groove 23 and the notch 21 leading to the inside of the magnetic core have opened a new heat dissipation channel, which is convenient to dissipate heat away from the inner layer coil at the window end and the middle column 13 of the magnetic core to prevent heat dissipation inside the inductor or transformer. If the temperature is too high, the insulation layer of the coil 3 of the winding group will be aged and brittle, causing short circuit or burning between the 3 turns of the coil of the winding group, and can prevent the inductor or transformer from being burned due to excessive temperature rise and magnetic saturation , which is conducive to prolonging the service life of the product.

As a preferred embodiment of the present invention, referring to Fig. 3 and Fig. 4, one end of the conduction heat dissipation groove 12 leading to the inside of the magnetic core extends to the central column 13 of the magnetic core, and the notch 21 on the splint 26 extends to the center of the winding bobbin 2 hole 25 hole wall; the above structure enables the insulating varnish to penetrate directly between the core column 13 and the center hole 25 of the winding bobbin, and evenly fills the core 1, the winding bobbin 2 and the winding group coil 3 and other parts In the gap, the infiltration effect of the insulating varnish is guaranteed, the bonding of the whole product after curing is tighter, the vibration noise is improved, and the insulation performance is more reliable. Outward heat dissipation, the whole product achieves better heat dissipation effect.

In order to meet the requirements of the convenience and consistency of the assembly of each component of the product, the end face of the notch 21 is provided with a positioning bump 22, and the bump 22 snaps into the diversion heat sink 12 to position the magnetic core 1 and the winding skeleton 2. When the winding When the wire frame 2 is mounted on the magnetic core 1, the notch protrusion 22 can be snapped into the positive flow-guiding heat sink 12, and the position does not need to be adjusted.

The invention can effectively improve the insulation performance and vibration noise of inductors or transformers through simple and ingenious structural improvements, and at the same time improve the heat dissipation performance, and can be widely used in various inductors or transformers.

Claims (4)

1. the modified node method of a magnetic core and bobbin, comprise a pair magnetic core (1), bobbin (2) and coiling group coil (3), described coiling group coil (3) is wrapped in the wire casing (24) of described bobbin (2), the magnetic core center pillar (13) of described a pair magnetic core (1) aligns cover and loads in the centre bore (25) of described bobbin (2), described magnetic core (1) is provided with ring wall (14) and described coiling group coil (3) and bobbin (2) is surrounded, described magnetic core ring wall (14) is provided with window (11), described bobbin (2) is protruding at described window (11) place pole foot support (23), it is characterized in that: in described a pair magnetic core (1), the inner bottom surface of any one or two is provided with flow-guiding radiation groove (12), described window (11) is led in described flow-guiding radiation groove (12) one end, it is inner that the other end leads to described magnetic core (1), the clamping plate (26) of any one or both ends of described bobbin (2) are upper offers notch (21) with described flow-guiding radiation groove (12) corresponding position.

2. modified node method according to claim 1, is characterized in that: one end that described flow-guiding radiation groove (12) leads to described magnetic core (1) inner extends to described magnetic core center pillar (13).

3. modified node method according to claim 1 and 2, is characterized in that: the notch (21) that the clamping plate (26) of described bobbin are offered extends to centre bore (25) hole wall of described bobbin (2).

4. modified node method according to claim 1 and 2, it is characterized in that: described notch (21) end face is provided with locating convex block (22), described projection (22) snaps in described flow-guiding radiation groove (12) and described magnetic core (1) and described bobbin (2) is located.