CN111430122A - Soft magnetic ferrite core element - Google Patents

Abstract

The invention relates to a soft ferrite magnetic core element, comprising two semicircular magnetic cores, the outer parts of the two magnetic cores are respectively wound with a first winding and a second winding, and the ends of the two magnetic cores are fixed with a fixed There is an air gap between the two magnetic cores, an adjusting device for adjusting the width of the air gap is installed between the two adjacent fixed sleeves, a cooling fan is installed at the center of the two magnetic cores, and the outer part of the cooling fan is arranged There is a fan cover, a heat-conducting sheet is fixed on the outside of the fan cover, and the outer edges of the heat-conducting sheet are respectively abutted with the first winding and the second winding. The soft ferrite core element is convenient to use and has good heat dissipation effect.

Description

A soft ferrite core element

technical field

The invention relates to the technical field of magnetic cores, in particular to a soft ferrite magnetic core element.

Background technique

There are some air gaps in the transformer to prevent magnetic saturation during operation. The function of the air gap is to increase the temperature of the magnetic core and the stability of the magnetic field. In addition, the air gap has the function of storing energy in the transformer. The role of the air gap: 1. The role of the air gap is to reduce the permeability, so that the coil characteristics are less dependent on the initial permeability of the magnetic core material; 2. The air gap can avoid large AC signals or DC bias. Under the phenomenon of magnetic saturation, the inductance can be better controlled. A core with higher permeability, such as a differential mode inductor, will saturate within a few turns, and the inductance value will not be high. So in order to wind more turns, the permeability needs to be reduced. When the air gap is opened, the overall magnetic circuit of the magnetic ring is discontinuous. Part of the magnetic circuit is air, and the air permeability is very low, so the overall magnetic permeability is reduced. You can wind more turns and achieve higher inductance values. In addition, the air gap makes the magnetization curve more linear, thus ensuring a consistent inductance value over the entire current range.

In the prior art, the magnetic core air gap opened on the annular magnetic core is difficult to accurately adjust to an appropriate distance during debugging, which is extremely inconvenient to use; in addition, the magnetic core has a poor heat dissipation effect and needs to be improved. Therefore, there is a need for a soft ferrite core element that is easy to use and has a good heat dissipation effect.

SUMMARY OF THE INVENTION

Aiming at the technical problems existing in the prior art, the present invention provides a soft ferrite core element with convenient use and good heat dissipation effect.

The technical solution of the present invention to solve the above-mentioned technical problems is as follows: a soft ferrite magnetic core element, comprising two semicircular magnetic cores, the outer parts of the two magnetic cores are respectively wound with a first winding and a second winding, The ends of the two magnetic cores are fixed with a fixing sleeve, an air gap is arranged between the two magnetic cores, and an adjusting device for adjusting the width of the air gap is installed between the two adjacent fixing sleeves , a cooling fan is installed at the center of the two magnetic cores, a fan cover is arranged on the outside of the cooling fan, a heat-conducting sheet is fixed on the outside of the fan cover, and the outer edges of the heat-conducting sheet are respectively connected with the first The winding and the second winding are in contact with each other.

Preferably, in the above-mentioned soft ferrite core element, wherein the adjusting device comprises an adjusting bolt, the inside of the fixing sleeve is provided with a threaded hole, and the adjusting bolt is embedded in the interior of two adjacent threaded holes .

Preferably, in the above-mentioned soft ferrite core element, the adjusting bolt is a hand-tightening bolt, which is convenient for adjustment.

Preferably, in the above soft ferrite core element, an arc-shaped concave surface is provided at the outer edge of the heat-conducting sheet, and the arc-shaped concave surface is suitable for increasing the relationship between the heat-conducting sheet and the first winding and the Contact surface of the second winding.

Preferably, in the above-mentioned soft ferrite core element, the arc-shaped concave surface is coated with silicone grease, which is suitable for heat conduction.

Preferably, in the above-mentioned soft ferrite core element, both ends of the first winding and the second winding are provided with retaining rings, and the retaining rings are embedded outside the magnetic core.

Preferably, in the above-mentioned soft ferrite core element, the fixing sleeve is made of a non-magnetic conductive material.

The beneficial effects of the present invention are: the soft ferrite core element is fixed with a fixed sleeve at the end of the magnetic core, the inside of the fixed sleeve is provided with threaded holes, and the adjustment bolts are embedded in the inside of two adjacent threaded holes. Adjusting bolts are hand-tightened for easy adjustment. The adjustment bolt can be manually rotated to adjust the width of the air gap through the thread. The arc-shaped concave surface is suitable for increasing the contact surface between the heat-conducting sheet and the first winding and the second winding, and the arc-shaped concave surface is coated with silicone grease, which is suitable for heat conduction. During operation, the heat generated by the winding is transferred to the fan cover through the heat-conducting sheet, and the heat can be quickly dissipated by the cooling fan. The soft ferrite core element is convenient to use and has good heat dissipation effect.

Description of drawings

Fig. 1 is the overall structure schematic diagram of the present invention;

Fig. 2 is the structural representation of the fixed sleeve in Fig. 1;

3 is a perspective view of a thermally conductive sheet;

FIG. 4 is a top view of the thermally conductive sheet in FIG. 3 .

In the accompanying drawings, the list of components represented by each number is as follows:

1. Fan cover, 2. Cooling fan, 3. First winding, 4. Second winding, 5. Magnetic core, 6. Fixing sleeve, 7. Baffle ring, 8. Adjusting bolt, 9. Heat conduction sheet, 91, Arc Shape concave, 92, side, 93, side edge, 10, air gap, 11, threaded hole.

Detailed ways

The principles and features of the present invention will be described below with reference to the accompanying drawings. The examples are only used to explain the present invention, but not to limit the scope of the present invention.

As shown in FIG. 1 , FIG. 2 , FIG. 3 , and FIG. 4 , a soft ferrite core element includes two semicircular cores 5 , and the two semicircular cores 5 form a closed loop. A first winding 3 and a second winding 4 are wound on the outside of the two magnetic cores 5 respectively, and an air gap 10 is arranged between the two magnetic cores 5. The function of the air gap is to reduce the magnetic permeability and make the coil characteristics less. Depending on the initial permeability of the magnetic core material, the air gap can avoid magnetic saturation under large AC signals or DC bias, and better control the inductance. Both ends of the first winding 3 and the second winding 4 are provided with baffle rings 7 , which are embedded in the outside of the magnetic core 5 and fixed by adhesive, and the baffle rings 7 can limit the windings.

The ends of the two magnetic cores 5 are fixed with a fixing sleeve 6 by adhesive, and the fixing sleeve 6 is a non-magnetic conductive material. An adjusting device for adjusting the width of the air gap 10 is installed between two adjacent fixing sleeves 6 . The adjusting device includes an adjusting bolt 8 . The interior of the fixing sleeve 6 is provided with a threaded hole 11 , and the adjusting bolt 8 is embedded in the two adjacent fixing sleeves. Inside the threaded hole 11. Adjusting bolt 8 is a hand-tightened bolt for easy adjustment. The adjustment bolt 8 can be manually rotated to adjust the width of the air gap 10 through threads.

A cooling fan 2 is installed at the center of the two magnetic cores 5, a fan cover 1 is arranged outside the cooling fan 2, a heat-conducting sheet 9 is fixed on the outside of the fan cover 1, and an arc-shaped concave surface 91 is arranged at the outer edge of the heat-conducting sheet 9, The arc-shaped concave surface 91 is located between the two side surfaces 92 and is sandwiched by two side edges 92 extending obliquely upward. The outer edge of the heat-conducting sheet 9, that is, the arc-shaped concave surface 91 abuts the first winding 3 and the second winding 4 respectively. The arc-shaped concave surface 91 is coated with silicone grease, which is suitable for heat conduction. During operation, the heat generated by the winding is transferred to the fan cover 1 through the heat-conducting sheet 9, and the heat can be quickly dissipated by the cooling fan.

The soft ferrite magnetic core element is fixed with a fixed sleeve 6 at the end of the magnetic core 5 , the inside of the fixed sleeve 6 is provided with threaded holes 11 , and the adjustment bolts 8 are embedded in the inside of two adjacent threaded holes 11 . Adjusting bolt 8 is a hand-tightened bolt for easy adjustment. The adjustment bolt 8 can be manually rotated to adjust the width of the air gap 10 through threads. The arc-shaped concave surface 91 is suitable for increasing the contact surface between the heat-conducting sheet 9 and the first winding 3 and the second winding 4 , and the arc-shaped concave surface 91 is coated with silicone grease, which is suitable for heat conduction. During operation, the heat generated by the winding is transferred to the fan cover 1 through the heat-conducting sheet 9, and the heat can be quickly dissipated by the cooling fan. The soft ferrite core element is convenient to use and has good heat dissipation effect.

In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for convenience The invention is described and simplified without indicating or implying that the device or element referred to must have a particular orientation, as well as a particular orientation configuration and operation, and therefore should not be construed as limiting the invention. In addition, "first" and "second" are for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implying the number of indicated technical features. Thus, a feature delimited with "first", "second" may expressly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

In the description of the present invention, it should be noted that, unless otherwise expressly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection , or integrally connected; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or the internal communication between the two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

An embodiment of the present invention has been described in detail above, but the content is only a preferred embodiment of the present invention, and cannot be considered to limit the scope of the present invention. All equivalent changes and improvements made according to the scope of the application of the present invention should still belong to the scope of the patent of the present invention.

Claims (7)

1. A soft ferrite core element characterized by: including two semicircular magnetic cores (5), two the outside of magnetic core (5) twines respectively has first winding (3), second winding (4), two the end of magnetic core (5) all is fixed with fixed cover (6), two be provided with air gap (10) between magnetic core (5), two adjacent install between fixed cover (6) and be used for adjusting the adjusting device of air gap (10) width, two radiator fan (2) are installed to the center department of magnetic core (5), radiator fan (2)'s outside is provided with fan casing (1), the external fixation of fan casing (1) has heat-conducting strip (9), the outer fringe of heat-conducting strip (9) respectively with first winding (3), second winding (4) butt.

2. The soft magnetic ferrite core element of claim 1, wherein: the adjusting device comprises an adjusting bolt (8), a threaded hole (11) is formed in the fixing sleeve (6), and the adjusting bolt (8) is embedded into the two adjacent threaded holes (11).

3. The soft magnetic ferrite core element of claim 2, wherein: the adjusting bolt (8) is a hand-screwed bolt, so that the adjustment is convenient.

4. The soft magnetic ferrite core element of claim 1, wherein: an arc-shaped concave surface (91) is arranged at the outer edge of the heat conducting fin (9), and the arc-shaped concave surface (91) is suitable for increasing the contact surface of the heat conducting fin (9) with the first winding (3) and the second winding (4).

5. The soft magnetic ferrite core element of claim 4, wherein: and silicone grease is coated on the arc concave surface (91) and is suitable for heat conduction.

6. The soft magnetic ferrite core element of claim 1, wherein: both ends of first winding (3), second winding (4) all are provided with fender ring (7), keep off ring (7) embedding in the outside of magnetic core (5).

7. The soft magnetic ferrite core element of claim 1, wherein: the fixing sleeve (6) is made of a non-magnetic material.

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