阅读说明：本技术 一种变压器用多层锰锌铁氧体磁芯 (Multilayer manganese zinc ferrite magnetic core for transformer ) 是由 沈佳晨 沈永春 曹德让 陈魏魏 王�义 王建敏 于 2021-07-29 设计创作，主要内容包括：本发明公开了一种变压器用多层锰锌铁氧体磁芯,属于变压器领域,一种变压器用多层锰锌铁氧体磁芯,通过设置的耐磨面层、锰氧体面层、锌氧体面层、铁氧体面层和防腐面层采用热压层片状设置,在集肤效应的作用下,能够有效的阻止形成大的涡流,硅钢片的电阻率大,这样涡流就小,在锰锌铁氧体磁芯的内部难面会产生细小的电流,通过设置的屏蔽罩,屏蔽罩的内部设置有传导纤维,伴随着传导纤维的传导以及安装杆的尖端放电,能够有效的将细小电流集中导送至传导柱的内部,电流在经过传导后,通过消损杆的内部电阻,能够有效的消耗电流以及将产生的热量导送并消耗于导热箱的内部,从而大大保证了锰锌铁氧体磁芯内部的导磁率。(The invention discloses a multilayer manganese-zinc ferrite magnetic core for a transformer, which belongs to the field of transformers, wherein a wear-resistant surface layer, a manganese oxide surface layer, a zinc oxide surface layer, a ferrite surface layer and an anti-corrosion surface layer are arranged in a hot-pressing layer shape, large eddy current can be effectively prevented from being formed under the action of skin effect, the resistivity of a silicon steel sheet is large, so that the eddy current is small, fine current can be generated on the inner hard surface of the manganese-zinc ferrite magnetic core, a conductive fiber is arranged in a shielding cover through the arranged shielding cover, the fine current can be effectively and intensively transmitted to the inside of a transmission guide pillar along with the transmission of the conductive fiber and the point discharge of an installation rod, the current can be effectively consumed and the generated heat can be transmitted and consumed in a heat conduction box through the internal resistance of a dissipation rod after being transmitted, thereby greatly ensuring the magnetic permeability inside the manganese-zinc ferrite magnetic core.)

1. A multilayer manganese zinc ferrite magnetic core for transformer, includes magnetic core body (1), its characterized in that: the inner upper layer of the magnetic core body (1) is provided with a wear-resistant surface layer (3), the inner part of the upper surface of the wear-resistant surface layer (3) is embedded with a heat dissipation top panel (2), the lower side of the wear-resistant surface layer (3) is connected with a manganese oxide surface layer (4), the lower side of the manganese oxide surface layer (4) is connected with a zinc oxide surface layer (5), the lower side of the zinc oxide surface layer (5) is provided with a ferrite surface layer (6), the lower side of the ferrite surface layer (6) is provided with an anti-corrosion surface layer (7), the inner part of the manganese oxide surface layer (4) is provided with a mounting groove (8), the inner part of the mounting groove (8) is provided with a heat conduction column (9), the outer surface of the heat conduction column (9) is fixedly provided with a shielding cover (10), the inner side of the shielding cover (10) is fixedly provided with an anti-interference layer (11), and the inner side of the anti-interference layer (11) is provided with a permeable layer (12), the inboard of permeable formation (12) is provided with kuppe (13), kuppe (13) are including location pearl (1301), the outer end fixed mounting of location pearl (1301) has conduction fibre (1302), the inside of kuppe (13) is provided with release layer (1303), electricity release hole (1304) have been seted up to the inside of release layer (1303), the inboard of electricity release hole (1304) is provided with inoxidizing coating (14), the inboard of inoxidizing coating (14) is provided with concentrated ball (15), the bottom fixed mounting of concentrated ball (15) has discharge rod (16), the bottom fixed mounting of discharge rod (16) has installation pole (17).

2. The multilayer manganese-zinc-ferrite core for transformers according to claim 1, wherein: the heat conduction module (18) comprises a conduction post (1801), a contact connection point (1802) is fixedly mounted on the outer surface of the conduction post (1801), an erosion rod (1803) is arranged inside the conduction post (1801), and the inner end of the erosion rod (1803) is connected with a heat conduction box (1804).

3. The multilayer manganese-zinc-ferrite core for transformers according to claim 2, wherein: the contact connection point (1802) is made of metal silver, the contact connection point (1802) is matched with the mounting rod (17), and the end part of the mounting rod (17) is in a sharp-pointed structure.

4. The multilayer manganese-zinc-ferrite core for transformers according to claim 2, wherein: the inside material of loss pole (1803) is the resistance area, and loss pole (1803) and contact connection point (1802) one-to-one set up to the inside of the inboard heat conduction case (1804) of connecting of loss pole (1803) is provided with nanometer environmental protection cooling coating.

5. The multilayer manganese-zinc-ferrite core for transformers according to claim 1, wherein: the heat conduction columns (9) penetrate through the manganese oxide surface layer (4), the zinc oxide surface layer (5) and the ferrite surface layer (6), the heat conduction columns (9) are arranged in the manganese oxide surface layer (4) at equal angles, and the heat conduction columns (9) are matched with the heat dissipation top panel (2).

6. The multilayer manganese-zinc-ferrite core for transformers according to claim 1, wherein: the shielding cover (10) is distributed on the outer side of the heat conducting column (9) at equal angles, and the shielding cover (10) is made of a steel wire armor layer.

7. The multilayer manganese-zinc-ferrite core for transformers according to claim 1, wherein: the conductive fiber (1302) refers to chemical fiber or metal fiber, carbon fiber and the like spun by mixing a conductive medium into a polymer, the conductive fiber (1302) is matched with the positioning bead (1301), and the positioning bead (1301) is connected to the outer end of the air guide sleeve (13) in a welding mode.

8. The multilayer manganese-zinc-ferrite core for transformers according to claim 1, wherein: the material of the interior of the concentration ball (15) is metal gold, and the concentration ball (15) and the discharge rod (16) form an integrated structure.

9. The multilayer manganese-zinc-ferrite core for transformers according to claim 1, wherein: the electric release holes (1304) are uniformly distributed in the release layer (1303), and the release layer (1303) is made of nickel-plated carbon fibers.

10. The multilayer manganese-zinc-ferrite core for transformers according to claim 1, wherein: the annular magnetic core is characterized in that a dense and homogeneous ceramic structure is filled between the wear-resistant surface layer (3), the manganese oxide surface layer (4), the zinc oxide surface layer (5), the ferrite surface layer (6) and the anti-corrosion surface layer (7), and the wear-resistant surface layer (3), the manganese oxide surface layer (4), the zinc oxide surface layer (5), the ferrite surface layer (6) and the anti-corrosion surface layer (7) form the annular magnetic core body (1) through a hot-pressing technology.

Technical Field

The invention relates to the field of transformers, in particular to a multilayer manganese-zinc ferrite magnetic core for a transformer.

Background

Ferrite cores are composed mainly of 3 metal elements, iron, manganese, and zinc, and are commonly referred to as manganese-zinc-ferrite. The annular ferrite magnetic core has high magnetic effect because of no air gap and consistent sectional area;

the ferrite core is made of dense and homogeneous non-metallic magnetic material with ceramic structure and low coercive force, and is also called soft magnetic ferrite. It consists of iron oxide and one or several oxide or carbonate compounds of other metals (e.g. manganese, zinc, nickel, magnesium). Compared with other types of magnetic materials, the ferrite has the advantages of high magnetic conductivity, high resistance in a wide frequency range, low eddy current loss and the like;

the shape of the manganese-zinc-ferrite core has an effect on a very important parameter, namely eddy currents, and a changing current causes a changing magnetic field to cause a changing current to prevent the change from generating a reverse magnetic field (lenz's law). This current is an eddy current; the eddy current can generate heat, the heat has certain influence on the magnetic conductivity of the manganese-zinc ferrite magnetic core body, and how to reduce the eddy current is a very important technology to be overcome for the existing manganese-zinc ferrite magnetic core.

Disclosure of Invention

1. Technical problem to be solved

The invention aims to provide a multilayer manganese-zinc ferrite magnetic core for a transformer, which adopts a hot-pressing lamellar arrangement through an arranged wear-resistant surface layer, a manganese oxide surface layer, a zinc oxide surface layer, a ferrite surface layer and an anti-corrosion surface layer, can effectively prevent the formation of large eddy current under the action of skin effect, like a transformer using a silicon steel sheet, because the resistivity of the silicon steel sheet is large, so that the eddy current is small, and fine current can be generated on the inner hard surface of the manganese-zinc ferrite magnetic core, through an arranged shielding cover, conductive fibers are arranged inside the shielding cover, the fine current can be effectively and intensively conducted to the interior of a conductive guide pillar along with the conduction of the conductive fibers and the discharge of the tip of an installation rod, and after the current is conducted through the conductive guide pillar, the current can be effectively consumed and the generated heat can be conducted and consumed in the interior of a heat conducting box through the internal resistance of a dissipation rod, thereby greatly ensuring the magnetic permeability inside the manganese-zinc ferrite magnetic core.

2. Technical scheme

In order to solve the above problems, the present invention adopts the following technical solutions.

A multilayer manganese-zinc ferrite magnetic core for a transformer comprises a magnetic core body, wherein a wear-resistant surface layer is arranged on the upper layer inside the magnetic core body, a heat-dissipation top panel is embedded and installed on the inner portion of the upper surface layer, a manganese oxide surface layer is connected to the lower side of the wear-resistant surface layer, a zinc oxide surface layer is connected to the lower side of the manganese oxide surface layer, a ferrite surface layer is arranged on the lower side of the zinc oxide surface layer, an anti-corrosion surface layer is arranged on the lower side of the ferrite surface layer, an installation groove is formed in the manganese oxide surface layer, a heat conduction column is installed in the installation groove, a shielding cover is fixedly installed on the outer surface of the heat conduction column, an anti-interference layer is fixedly installed on the inner side of the shielding cover, a permeable layer is arranged on the inner side of the anti-interference layer, a flow guide cover is arranged on the inner side of the permeable layer, the flow guide cover comprises a positioning bead, and conductive fibers are fixedly installed on the outer end of the positioning bead, the inside of kuppe is provided with the release layer, the electricity release hole has been seted up to the inside of release layer, the inboard in electricity release hole is provided with the inoxidizing coating, the inboard of inoxidizing coating is provided with concentrated ball, the bottom fixed mounting of concentrated ball has the discharge rod, the bottom fixed mounting of discharge rod has the installation pole.

Furthermore, the heat conduction module comprises a heat conduction pillar, a contact connection point is fixedly mounted on the outer surface of the heat conduction pillar, a loss elimination rod is arranged inside the heat conduction pillar, a heat conduction box is connected to the inner end of the loss elimination rod, and heat generated in the process of passing through the resistor by effectively consuming current can be conducted through the set heat conduction module.

Furthermore, the inside material of contact connecting point is metallic silver, and contact connecting point and installation pole phase-match to the tip of installation pole is spine column structure, and the point that conveniently installs the pole discharges.

Further, the inside material of loss pole that disappears is the resistance area, and the loss pole that disappears sets up with the contact connection point one-to-one to the inside of the inboard heat conduction case that connects of loss pole that disappears is provided with nanometer environmental protection cooling coating, and the setting of loss pole is convenient for consume the electric current.

Furthermore, the heat conduction post runs through in the inside of manganese ferrite surface course, zinc ferrite surface course and ferrite surface course, and the heat conduction post is in the inside of manganese ferrite surface course equal angle setting to the heat conduction post and the top panel phase-match that dispels the heat make things convenient for the installation of heat conduction post to be fixed, can effectually play radiating effect.

Furthermore, the shielding cover is distributed at equal angles outside the heat conducting column, and the shielding cover is made of a steel wire armor layer, so that external magnetic interference can be conveniently shielded.

Furthermore, the conductive fiber is chemical fiber or metal fiber, carbon fiber and the like spun by mixing a conductive medium into a polymer, and the conductive fiber is matched with the positioning bead, and the positioning bead is connected to the outer end of the air guide sleeve in a welding mode, so that current is conveniently guided to the interior of the concentration ball through the conductive fiber.

Furthermore, the material of the interior of the concentration ball is metal gold, and the concentration ball and the discharge rod form an integrated structure, so that current can be conveniently concentrated and collected.

Furthermore, the electricity release holes are uniformly distributed in the release layer, and the release layer is made of nickel-plated carbon fibers, so that current release is facilitated.

Furthermore, compact and homogeneous ceramic structures are filled between the wear-resistant surface layer, the manganese oxide surface layer, the zinc oxide surface layer, the ferrite surface layer and the anti-corrosion surface layer, the wear-resistant surface layer, the manganese oxide surface layer, the zinc oxide surface layer, the ferrite surface layer and the anti-corrosion surface layer form an annular magnetic core body through a hot pressing technology, and large eddy current can be effectively prevented from being formed under the effect of a skin effect.

3. Advantageous effects

Compared with the prior art, the invention has the advantages that

(1) This scheme adopts the lamellar setting of hot pressing layer through wear-resisting surface course, manganese ferrite surface course, zinc ferrite surface course, ferrite surface course and the anticorrosive surface course that sets up, under the effect of skin effect, can effectual prevention form big vortex. Like the transformer uses the silicon steel sheet, because the resistivity of silicon steel sheet is big, the vortex is just so little, can produce tiny electric current at manganese zinc ferrite magnetic core's the difficult face in inside, through the shield cover that sets up, the inside of shield cover is provided with the conduction fibre, along with the conduction of conduction fibre and the point discharge of installation pole, can effectually concentrate the conduction of tiny electric current to the inside of conduction post, the electric current is after the conduction of conduction post, through losing the internal resistance of pole, can effectual consumption electric current and with the heat conduction of production and consume in the inside of heat conduction case, thereby the inside magnetic permeability of manganese zinc ferrite magnetic core has been guaranteed greatly.

(2) The heat conduction module comprises a conduction pillar, a contact connection point is fixedly mounted on the outer surface of the conduction pillar, a loss elimination rod is arranged inside the conduction pillar, the inner end of the loss elimination rod is connected with a heat conduction box, and heat generated in the resistance process can be effectively consumed through the set heat conduction module.

(3) The inside material of contact connecting point is silver metal, and contact connecting point and installation pole phase-match to the tip of installation pole is spine column structure, and the point that facilitates the installation pole discharges.

(4) The inside material of loss pole is the resistance area, and the loss pole sets up with the contact connection point one-to-one to the inside of the inboard heat conduction case of connecting of loss pole is provided with nanometer environmental protection cooling coating, and the setting up of loss pole makes things convenient for the consumption current.

(5) The heat conduction post runs through in the inside of manganese ferrite surface course, zinc ferrite surface course and ferrite surface course, and the heat conduction post is in the inside of manganese ferrite surface course equiangular setting to the heat conduction post and the heat dissipation top panel phase-match make things convenient for the installation of heat conduction post fixed, can effectually play radiating effect.

(6) The shielding cover is in the angular distribution such as the outside of heat conduction post, and the inside material of shielding cover is the steel wire armor, conveniently shields external magnetic interference.

(7) The conductive fiber is chemical fiber or metal fiber, carbon fiber and the like spun by mixing a conductive medium into a polymer, and is matched with the positioning bead, and the positioning bead is connected to the outer end of the air guide sleeve in a welding mode, so that current is conveniently guided to the inside of the concentration ball through the conductive fiber.

(8) The inside material of concentrating the ball is metal gold, and concentrates the ball and constitute integrated structure with the discharge electrode, conveniently concentrates and collects the electric current.

(9) The electricity release hole is evenly distributed in the release layer, and the inside material of release layer is nickel-plated carbon fiber, makes things convenient for the release of electric current.

(10) The ceramic structure of fine and close homogeneity is filled to wear-resisting surface course, manganese oxysome surface course, zinc oxysome surface course, ferrite surface course and anticorrosive surface course between the layer, and wear-resisting surface course, manganese oxysome surface course, zinc oxysome surface course, ferrite surface course and anticorrosive surface course form annular magnetic core through hot pressing technique, under the effect of skin effect, can effectually prevent to form big vortex.

Drawings

FIG. 1 is a schematic front view of the present invention;

FIG. 2 is a schematic front sectional view of the present invention;

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

FIG. 4 is a schematic top cross-sectional view of a heat-conducting pillar according to the present invention;

FIG. 5 is an enlarged view of the structure at A in FIG. 4 according to the present invention;

fig. 6 is an enlarged schematic view of the structure at B in fig. 4 according to the present invention.

The reference numbers in the figures illustrate:

1. a magnetic core body; 2. a heat-dissipating top panel; 3. a wear-resistant surface layer; 4. a manganese oxide surface layer; 5. a zinc oxide surface layer; 6. a ferrite surface layer; 7. an anti-corrosion surface layer; 8. mounting grooves; 9. a heat-conducting column; 10. a shield case; 11. an anti-interference layer; 12. a permeable layer; 13. a pod; 1301. a positioning bead; 1302. a conductive fiber; 1303. a release layer; 1304. an electricity releasing hole; 14. a protective layer; 15. a ball is collected; 16. a discharge rod; 17. mounting a rod; 18. a heat conducting module; 1801. a guide post; 1802. a contact connection point; 1803. a wear rod; 1804. a heat conducting box.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention; it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work are within the scope of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like are to be construed broadly, e.g., "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example 1:

referring to fig. 1-6, a multilayer manganese-zinc-ferrite magnetic core for a transformer comprises a magnetic core body 1, a wear-resistant surface layer 3 is arranged on the upper layer inside the magnetic core body 1, a heat-dissipating top panel 2 is embedded inside the upper surface of the wear-resistant surface layer 3, a manganese oxide surface layer 4 is connected to the lower side of the wear-resistant surface layer 3, a zinc oxide surface layer 5 is connected to the lower side of the manganese oxide surface layer 4, a ferrite surface layer 6 is arranged on the lower side of the zinc oxide surface layer 5, an anti-corrosion surface layer 7 is arranged on the lower side of the ferrite surface layer 6, an installation groove 8 is formed inside the manganese oxide surface layer 4, a heat-conducting column 9 is installed inside the installation groove 8, a shielding cover 10 is fixedly installed on the outer surface of the heat-conducting column 9, an anti-interference layer 11 is fixedly installed on the inner side of the shielding cover 10, a permeable layer 12 is arranged on the inner side of the permeable layer, a flow-guiding cover 13 comprises a positioning bead 1301, the outer end of the positioning bead 1301 is fixedly provided with a conductive fiber 1302, the inside of the air guide sleeve 13 is provided with a release layer 1303, the inside of the release layer 1303 is provided with an electric release hole 1304, the inner side of the electric release hole 1304 is provided with a protective layer 14, the inner side of the protective layer 14 is provided with a concentration ball 15, the bottom end of the concentration ball 15 is fixedly provided with a discharge rod 16, and the bottom end of the discharge rod 16 is fixedly provided with an installation rod 17.

Referring to fig. 6, the heat conducting module 18 includes a conducting pillar 1801, a contact connection point 1802 is fixedly mounted on an outer surface of the conducting pillar 1801, an erosion rod 1803 is disposed inside the conducting pillar 1801, an inner end of the erosion rod 1803 is connected to a heat conducting box 1804, and heat generated in the process of passing current through a resistor can be effectively dissipated through the arranged heat conducting module 18. The inside material of contact connection point 1802 is silver, and contact connection point 1802 and installation pole 17 phase-match to the tip of installation pole 17 is spine-like structure, makes things convenient for the point discharge of installation pole 17. The inside material of loss pole 1803 that disappears is the resistance area, and loss pole 1803 and contact connection point 1802 one-to-one sets up to the inside of the inboard heat conduction case 1804 that connects of loss pole 1803 that disappears is provided with nanometer environmental protection cooling coating, and the setting of loss pole 1803 makes things convenient for the consumption current.

Referring to fig. 1-3, the heat-conducting pillars 9 penetrate through the interior of the manganese oxide surface layer 4, the zinc oxide surface layer 5 and the ferrite surface layer 6, the heat-conducting pillars 9 are disposed at equal angles in the interior of the manganese oxide surface layer 4, and the heat-conducting pillars 9 are matched with the heat-dissipating top panel 2, so that the heat-conducting pillars 9 can be conveniently mounted and fixed, and the heat-dissipating effect can be effectively achieved. The ceramic structure of compact homogeneity is filled between wear-resisting surface course 3, manganese oxysome surface course 4, zinc oxysome surface course 5, ferrite surface course 6 and anticorrosive surface course 7 layers and layer, and wear-resisting surface course 3, manganese oxysome surface course 4, zinc oxysome surface course 5, ferrite surface course 6 and anticorrosive surface course 7 pass through hot pressing technique and form cyclic annular magnetic core 1, under the effect of skin effect, can effectually prevent to form big vortex.

Referring to fig. 4-5, the shielding cover 10 is disposed at the outer side of the heat conducting column 9 at equal angles, and the shielding cover 10 is made of a steel wire armor layer, so as to shield external magnetic interference. The conductive fiber 1302 is a chemical fiber or a metal fiber, a carbon fiber, etc. spun by mixing a conductive medium into a polymer, and the conductive fiber 1302 is matched with the positioning bead 1301, and the positioning bead 1301 is connected to the outer end of the air guide sleeve 13 by welding, so that current is conveniently guided to the inside of the concentration ball 15 through the conductive fiber 1302. The material of the interior of the concentration ball 15 is metal gold, and the concentration ball 15 and the discharge rod 16 form an integrated structure, so that current can be conveniently concentrated and collected. The electricity release holes 1304 are uniformly distributed in the release layer 1303, and the release layer 1303 is made of nickel-plated carbon fiber, so that the current can be conveniently released.

Referring to fig. 1-2, when in use, the magnetic core 1 is sequentially layered from outside to inside with a wear-resistant surface layer 3, a manganese ferrite surface layer 4, a zinc ferrite surface layer 5, a ferrite surface layer 6 and an anti-corrosion surface layer 7, and a dense and homogeneous ceramic structure is filled between the layers, and the magnetic core 1 is arranged in a hot-pressing layer shape, so that large eddy current can be effectively prevented from being formed under the effect of skin effect.

During the use of the magnetic core body 1, a small amount of current is generated inside, the current penetrates through the shielding case 10 and is conducted to the inside of the positioning bead 1301 through the conducting fiber 1302, the current is stably conducted to the inside of the electricity releasing hole 1304 arranged inside the releasing layer 1303 and is stored in the concentration ball 15 in a concentration manner under the action of the positioning bead 1301, so that the current is conveniently and stably stored, and the current is transmitted to the inside of the contact connection point 1802 in a point discharge manner through the mounting rod 17 arranged at the end part of the discharging rod 16, so that the current is conveniently and intensively collected and conducted to a proper position;

the contact connection point 1802 transmits current to the inside of the loss elimination rod 1803, when the current passes through the internal resistance of the loss elimination rod 1803, the current is consumed and transmits the generated heat to the heat conduction box 1804, the nano environment-friendly cooling coating is arranged inside the heat conduction box 1804, the internal temperature of the magnetic core body 1 can be quickly reduced, the heat can be quickly dissipated on the heat dissipation top panel 2, the current can be effectively consumed, the generated heat can be transmitted and consumed inside the heat conduction box 1804, thereby greatly ensuring the magnetic permeability inside the manganese-zinc ferrite magnetic core, and completing a series of operations of the multilayer manganese-zinc ferrite magnetic core for the transformer, through the arrangement of the wear-resistant surface layer, the manganese-ferrite surface layer, the zinc-ferrite surface layer, the ferrite surface layer and the anti-corrosion surface layer, the formation of large eddy current can be effectively prevented under the effect of skin effect, like a silicon steel sheet is used by the transformer, because the resistivity of silicon steel sheet is big, the vortex is just little like this, can produce tiny electric current at the difficult face in manganese zinc ferrite magnetic core's inside, through the shield cover that sets up, the inside of shield cover is provided with the conduction fibre, along with the conduction of conduction fibre and the point discharge of installation pole, can effectually concentrate the conduction of tiny electric current to the inside of conduction pillar, the electric current is after the conduction through the conduction pillar, through the internal resistance who loses the pole, can effectual consumption electric current and with the heat conduction of production and consume in the inside of heat conduction case, thereby the inside magnetic permeability of manganese zinc ferrite magnetic core has been guaranteed greatly.

The above are only preferred embodiments of the present invention; the scope of the invention is not limited thereto. Any person skilled in the art should be able to cover the technical scope of the present invention by equivalent or modified solutions and modifications within the technical scope of the present invention.