CN219085775U

CN219085775U - High-frequency transformer

Info

Publication number: CN219085775U
Application number: CN202223544746.8U
Authority: CN
Inventors: 蒋露; 夏茂燕; 景致钧; 邵博; 武佳文; 刘植南
Original assignee: Hunan Medex Electric Co ltd; Hunan Lince Rolling Stock Equipment Co Ltd
Current assignee: Hunan Medex Electric Co ltd; Hunan Lince Rolling Stock Equipment Co Ltd
Priority date: 2022-12-29
Filing date: 2022-12-29
Publication date: 2023-05-26
Anticipated expiration: 2032-12-29

Abstract

The utility model discloses a high-frequency transformer, which belongs to the field of rail transit equipment and comprises a winding, a magnetic core and a shell, wherein the winding is formed by winding a metal wire and an insulating paper; the winding is nested at the periphery of the magnetic core, and the magnetic core is a rectangular magnet composed of manganese-zinc soft magnetic ferrite; the winding and the magnetic core are arranged in the shell, a plurality of radiating fins are arranged on the periphery of the shell relative to the winding, one end of each radiating fin penetrates through the shell and extends into the shell, and a pouring layer is poured into the shell; the Mn-Zn soft magnetic ferrite has the characteristics of high magnetic conductivity, high resistivity and low loss in a high-frequency state, blocks can be stacked into a rectangular shape in an adhesive manner, and the heat dissipation form of the rectangular magnet is more uniform and single; heat is conducted to the radiating fins attached to the pouring layer through the pouring layer, heat is conducted to the outside of the shell through the radiating fins to radiate, radiating uniformity is high, and radiating effect is good.

Description

High-frequency transformer

Technical Field

The utility model belongs to the field of rail transit equipment, and particularly relates to a high-frequency transformer.

Background

The high-frequency transformer or reactor is used as a key component of a switching power supply and an LLC resonant DC/DC converter, is a main device for realizing energy conversion and transmission, harmonic wave processing and improving the quality of the power supply, and is a main occupation and heat source of space and weight in system equipment. With the increasing of power of application systems, the problems of insulation, heat dissipation, space occupation ratio and light weight of high-frequency equipment become the problems to be solved in the design of high-frequency products.

On the one hand, the volume of the transformer or the reactor can be reduced due to the high frequency of the product, and the advantage of the low-power product in light weight is particularly obvious. However, the high frequency is realized because of the reduction of the volume, the loss of the iron core and the winding is increased, the product is seriously heated, the heat dissipation area is reduced, and the heat dissipation design of the high frequency product is more required.

Disclosure of Invention

The utility model aims to provide a high-frequency transformer, which solves the problems of serious heating problem and low heat dissipation capability of a high-frequency transformer iron core and a winding in the prior art.

Provided is a high frequency transformer including:

the winding is formed by winding a metal wire and an insulating paper;

the magnetic core is a rectangular magnet composed of manganese-zinc soft magnetic ferrite;

the shell, winding and magnetic core set up in the inside of shell, the shell has arranged a plurality of radiating fins for the week side of winding, radiating fin one end runs through the shell and stretches into the inside of shell, the pouring layer has been poured into in the shell.

Further, the insulating paper is Nomex paper or NHN insulating paper.

Further, the housing is made of stainless steel, and the heat radiating fins are made of aluminum alloy.

Further, the shell and the radiating fins are fixedly connected through welding.

Further, the pouring layer is high-heat-conductivity pouring sealant.

Compared with the prior art, the utility model has the beneficial effects that:

the Mn-Zn soft magnetic ferrite has the characteristics of high magnetic conductivity, high resistivity and low loss in a high-frequency state, blocks can be stacked into a rectangular shape in an adhesive manner, and the heat dissipation form of the rectangular magnet is more uniform and single; heat is conducted to the radiating fins attached to the pouring layer through the pouring layer, heat is conducted to the outside of the shell through the radiating fins to radiate, radiating uniformity is high, and radiating effect is good.

Drawings

The present utility model is further described below with reference to the accompanying drawings for the convenience of understanding by those skilled in the art.

Fig. 1 is a schematic diagram of the overall structure of a high frequency transformer.

In the figure: 1. a winding; 2. a magnetic core; 3. a housing; 4. a heat radiation fin; 5. and (5) pouring a layer.

Detailed Description

The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the particular embodiments described herein are illustrative only and are not intended to limit the utility model, i.e., the embodiments described are merely some, but not all, of the embodiments of the utility model. The components of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be made by a person skilled in the art without making any inventive effort, are intended to be within the scope of the present utility model.

Referring to fig. 1, a high frequency transformer according to an embodiment of the present utility model includes a winding 1, a magnetic core 2, and a housing 3. The winding 1 is formed by winding a metal wire and an insulating paper, wherein the metal wire is made of aluminum or copper strips (foils), and the insulating paper can be made of Nomex paper or NHN insulating paper, and the aluminum or copper strips (foils) and the Nomex paper or NHN insulating paper are wound together to form the winding 1; the Nomex paper has higher mechanical property, flexibility and good electrical property, and can keep the characteristics at higher temperature; the NHN insulating paper has higher tensile strength, edge tearing resistance and good electrical strength. The winding 1 may be made of aluminum or copper enameled litz wire.

The magnetic core 2 is a rectangular magnet composed of Mn-Zn soft magnetic ferrite, and the winding 1 is nested at the periphery of the magnetic core. The Mn-Zn soft magnetic ferrite has the characteristics of high magnetic conductivity, high resistivity and low loss in a high-frequency state, and the Mn-Zn soft magnetic ferrite blocks can be bonded by the adhesive of the Letai 510 and stacked into a rectangular shape; the winding 1 is nested on the periphery of the magnetic core, the nesting range of the winding 1 is the main heating range of the magnetic core 2, and the radiating form of the rectangular nesting mode mainly diverges uniformly in the lateral direction, so that the radiating form of the rectangular magnet is more uniform and single relative to the radiating form of the annular magnet and the like.

The winding 1 is nested with the magnetic core 2 and then arranged in the shell 3, the shell 3 is provided with a plurality of radiating fins 4 relative to the peripheral side of the winding 1, one end of each radiating fin 4 penetrates through the shell 3 and stretches into the shell 3, and after the heat conducting ends of the radiating fins 4 are all positioned in the shell 3, a pouring layer 5 is poured into the shell 3. Heat is conducted to the position of the radiating fins 4 attached to the pouring layer 5 through the pouring layer 5, heat is conducted to the outside of the shell 3 through the radiating fins 4 to radiate, radiating uniformity is high, and radiating effect is good.

The housing 3 is made of stainless steel, and the heat radiating fins 4 are made of aluminum alloy. Stainless steel has a hardness, strength and corrosion resistance greater than that of aluminum alloys, which have a thermal conductivity greater than that of stainless steel. The shell 3 mainly plays a role in protection and needs to have the performances of shock resistance, collision resistance and corrosion resistance, so that the main material of the shell 3 is stainless steel; the heat dissipation fins 4 mainly conduct heat, so the main material of the heat dissipation fins 4 is aluminum alloy. In addition, the aluminum alloy has the characteristic of easy processing and shaping, and can process the radiating fins 4 into an arc shape, increase the contact area and improve the heat conduction efficiency.

When the radiating fins 4 are connected with the shell 3, the radiating fins 4 are fixedly connected with the shell 3 through welding, and the radiating fins 4 are connected with the shell 3 through air welding, so that the connection strength between the radiating fins 4 and the shell 3 is enhanced, and falling-off caused by insufficient connection strength between the radiating fins 4 and the casting layer 5 is prevented.

Specifically, the pouring layer 5 is a high-heat-conductivity pouring sealant, and the brand is DML2227. The high-heat-conductivity pouring sealant can be self-solidified to form an elastic heat-conducting insulator, has good heat conductivity and insulativity, and has a wide use temperature range; the fluidity is good, and the narrow gaps around the dense radiating fins 4 can be fully filled.

The foregoing is merely illustrative of the structures of this utility model and various modifications, additions and substitutions for those skilled in the art can be made to the described embodiments without departing from the scope of the utility model or from the scope of the utility model as defined in the accompanying claims.

Claims

1. A high frequency transformer, comprising:

the winding (1) is formed by winding a metal wire and an insulating paper;

the magnetic core (2), the said winding (1) is nested in the periphery of the magnetic core (2), the said magnetic core (2) is the rectangular magnet made up of manganese zinc series soft magnetic ferrite;

the winding device comprises a shell (3), wherein the winding (1) and a magnetic core (2) are arranged in the shell (3), a plurality of radiating fins (4) are arranged on the periphery of the shell (3) relative to the winding (1), one end of each radiating fin (4) penetrates through the shell (3) and stretches into the shell (3), and a pouring layer (5) is poured into the shell (3).

2. The high frequency transformer according to claim 1, wherein the insulating paper is Nomex paper or NHN insulating paper.

3. A high frequency transformer according to claim 1, characterized in that the housing (3) is made of stainless steel and the heat radiating fins (4) are made of an aluminum alloy.

4. A high frequency transformer according to claim 3, characterized in that the housing (3) and the heat sink fins (4) are fixed by means of a welded connection.

5. A high frequency transformer according to claim 1, characterized in that the casting layer (5) is a high heat conducting potting compound.